Vacuum pump exhaust oil how to solve?

Vacuum pump after use for a long time, if not for regular maintenance would be a big or small issues, such as exhaust oil, vent oil is only one: the main reasons why exhaust filters.

First, the causes of exhaust filter oil

1, exhaust filter fails, the oil and gas can't completely separate.

2, exhaust filter installation bad mouth o-ring seal.

3, exhaust filter installation does not reach the designated position. Shaft seal leakage, leakage problem is common.

Found that the shaft seal leakage due to abrasion, oil, must want to change the shaft sealing ring. Different pump types, different manufacturers design of shaft seal structure is not the same. According to the original design pattern with similar or identical seal change. Standard parts such as spring rubber ring wear air leakage is not serious, detachable go a few rounds of fastening wire spring loaded again can. Serious wear and tear shall be in accordance with the original diameter changing new sealing ring. O, j type and Jo type sealing ring, all have standard series, location should be paid attention to when assembling trued and pressure. Some of the rubber sealing ring can be homemade. Its inner diameter can be obtained by measuring the shaft and the shaft hole, size should be slightly smaller, there should be room for compaction thickness, easy to mount can lock itself.

Second, the vacuum pump daily maintenance methods

1, 3 to 6 months will be in a special vacuum pump oil, each pump in the factory when will indicate what is oil. You want to change original, don't mix,

2, about six months in a vent filters and in filter and treasure to vacuum pump oil.

Introduction to feed water pump running in the process of common failures and solutions

With the constant progress of the society, electric power and industrial development and people's life is closely related to the high grade energy, one of the growing demand for its people. Thermal power though right now the consumption of fossil fuels such as coal and pollution of the environment has a great influence, but according to the special national conditions of our country, coal is still the main mode of power supply, the proportion of the total installed capacity at about 70%. Thermal power plant is composed of boiler, steam turbine and generator three host and feed water pump, coal mill and other auxiliary equipment and control system. Feed water pump is a core system of thermal power plant boiler auxiliaries, its purpose is to continuously provide to boiler has the pressure, temperature and flow rate of water supply. Feed water pump is generally divided into two kinds of electric and steam, shanxi jincheng a 300 MW thermal power plant boiler supporting electric feed water pump. In the plant electric feed water pump, for example, this paper introduces the working process of the feed water pump, the common faults in the operation process and the corresponding solutions, in order to provide some reference for the general electric power staff.

1 feed pump overview

Feed water pump is not only to provide sufficient pressure, temperature and flow rate of feed water boiler, but also provide reheater, superheater attemperator and reduction of warm water, so the safety and reliability of the feed water pump, a direct impact on the safety operation of boiler system and steam turbine generator set, serious when still can cause boiler water dry the occurrence of serious accidents, such as the higher the greater unit capacity and parameter, the importance of the feed water pump, the more prominent. [1]

Shanxi jincheng a thermal power plant 300 MW unit configuration is as follows: 50% capacity electric three main feed pump, two with one case. Models for DG600-240 - v (FK6D32); Type of cylinder core package, horizontal; Has six levels of impeller, motor models for YKS800-4 electric (Shanghai), feed water pump directly driven by motor through coupling, booster pump driven by motor directly, feed water pump and coupling, coupling and motor and motor and booster pump through the fold type shaft coupling.

Two common faults in the operation of feed water pump

Feed water pump can be stable operation of the safety and economy of boiler has a close relationship with large boiler unit generally configuration many sets of feed water pump, there are one or two electric feed water pump as backup. The power plant capacity 50% electric three main feed pump, 2 in one case, in the process of actual operation, the feed water pump fault has common motor overheating overheating [2], the pump body, pump body flow and system fault, such as vibration malfunction phenomenon, the possible reasons and solutions to see table 1.

3 in the operation of the feed water pump fault solution

3.1 the feed water pump troubleshooting

3.1.1 mechanical seal leakage, high temperature in the water injection pipe

As water injection pipe in air, check the mesh cleanliness, check whether the external cooling water is enough; If big is the collapse of the mechanical seal leakage, check whether the pump ring is installed backwards, cooler and the purity of the mesh, dynamic and static ring for wear.

3.1.2 bearing temperature is high

Check the lube oil cooler, increase the cooling water, adjust the oil hole plate, increase in traffic; Adjust the pressure relief valve, the oil pressure; The collapse of the bearing when necessary, check the bearing clearance.

3.2 the feed water pump booster pump troubleshooting

3.2.1 mechanical seal leakage

Spring force is not enough, loosen screw mechanical seal on the shaft sleeve, the sleeve to move about 1 ~ 2 mm, outside the pump to tighten the screw. If the big leakage, the need to strip inspection, replace if necessary.

3.2.2 the drive end bearing oil

Thrust bearing oil return is not the driving end plug holes on the bearing cover plate, often to the bearing chamber oil return, because of the large amount of oil return cause oil leakage. Reveal a plug hole plate, narrow small aperture.

3.2.3 booster pump shaft in small flow up

Double-suction volute pump in the small flow rate, the impeller out of the mouth room is easy to produce pressure fluctuations caused by axial channeling move, in the big traffic (about 300 t/h or above) or disappear completely, cold center, in accordance with requirements can reduce the booster pump shaft move.

3.2.4 cold installation to the center

Remove the upper cover of motor bearing, with a precise level 4 meters, on the shaft neck area, check the shaft back in internal carotid should be equal on both sides of the shaft, and in the opposite direction. If you need adjustable wedgeplug pad under the floor, to ensure our internal jugular back degrees equal on both sides of the axis, the reset bearing upper cover.

3.2.5 the axial position of motor rotor must be consistent with the center of the magnetic field of the motor

Runtime box body heat expansion, gear tooth force when rotating, bearing clearance, and the hydrodynamic lubricating oil can cause axis offset. Therefore in the pump set is cold find center, must be set in the horizontal, vertical, axial offset, the expected offset compensation when starting and running.

4 conclusion

Thermal power is made up of boiler, turbine and generator three host and feed water pump, coal mill, such as auxiliary coordination of unified whole, an equipment or system malfunction could affect the safety and reliability of the whole system, especially the feed water pump as the working medium for boiler equipment, is the core of the auxiliary boiler system, its role in the boiler system is self-evident. In the process of actual operation, because of the feed water pump working environment is bad. Frequently, all kinds of feed water pump failure, the staff must be regularly for feed water pump of power plants for maintenance, found problems in a timely manner, to ensure the safe operation of boiler feed water pump and system.

The working principle of the vertical self-priming pump

Self-priming pump is southern commonly used a pump. Principle is to use the water velocity of flow momentum, drives the pump impeller impeller pumping water into the river. Thrown into the river to the pump pumping, but must be water, or a place to have head.

Self-priming pump and centrifugal pump is different in general. Centrifugal pump, before work, pump body and feed line must be tank filled with water into a vacuum, when the fast rotating impeller blade promote water quickly spin, spin the water under the action of centrifugal force, fly away from the impeller, pump in the water is thrown, the center of the impeller part form the vacuum area. Water in the original water at atmospheric pressure (or hydraulic) through the pipe network pressure under the action of the feed water pipe. So circulates, can achieve continuous pumping.

Self-priming pump is not need irrigation water diversion, this is the origin of self-priming pump.

Self-priming pump self-priming principle: as the pump shell's special design. Its high sealing performance than general centrifugal pump, and motor to halt the water in the pump housing will not automatically after emptying, motor drive the turbine at high speed, quickly make form a negative pressure (vacuum) inside the pump. After using atmospheric pressure pumping water to the pump shell, centrifugal head again. So, self-priming pump suction, no more than an atmospheric pressure, about 11 m.

Scope of application of self-priming pump

1, suitable for urban environmental protection, construction, fire control, chemical, pharmaceutical, dyes, and dyeing, brewing, electric power, electroplating, paper making, washing of industrial mines, cooling of equipment, etc.

2, with a swing arm sprayer, the water can rush into the air, a small drips to spray, is a good tool for farm, nursery, garden, garden.

3, suitable Yu Qingshui, water, chemical liquid medium with acid, alkalinity and with general mushy slurry (medium viscosity < 100 mm pearl, solid content of 30%).

4, and can be matched with pressure filter of any model and specifications, send paste to filter machine supporting the ideal pump for filter.

The choice of drainage pumps and requirements

Building use drainage pumps are submersible sewage pump, liquid discharge pump, vertical sewage pump and horizontal sewage pump, etc. Because within the building area is lesser, general displacement is not big, give priority to use diving sewage pump and drainage pump liquid discharge pumps, including submerged sewage pump is in commonly used in important places; Vertical and horizontal sewage pumps pump set isolation requirements, since the irrigation water, and take up a certain field, so the less use in the building.

Drainage pump flow should be according to the second life drainage design flow of the selected; When a displacement adjustment, drainage maximum hours flow selected according to life. Fire elevator collecting basin drainage pump flow within not less than 10 l/s.

Drainage pump lift according to hoisting height, piping loss calculation is determined, then add some free head. Free head should be 0.02 ~ 0.03 MPa. Drainage pump suction pipe and outlet pipe flow velocity should not be less than 0.7 m/s, and should not be more than 2.0 m/s.

Public buildings should be in each life drain collecting basin as a unit set up a backup pump, at ordinary times should be interactive operation. Basement, equipment room, garage flushing the drainage of the ground, such as when there are more than two and two drainage pumps don't pump equipment. When collecting basin can't set accident drainage pipe, water pump should be uninterrupted power supply; When can close drainage inlet pipe, not for uninterruptible power supply, but should be set up alarm device.

As ascension with larger impurities of sewage, waste water, the different set inside the pool diving sewage pump outlet pipe should not be combined discharge; When raising the waste water, according to actual situation consider different collection pool diving sewage pump outlet pipe combined discharge.

Two or more than two Shared a water pump outlet pipe, shall be installed on each pump outlet pipe valve and check valve. Single pump drainage could produce flow backward, should set the check valve. Don't allow pressure drainage clearance and architecture in gravity drainage consolidation.

When diving sewage pump ascending containing large pieces of debris, appropriate of diving sewage pump with a crushing device; When ascending contains more fiber content of sewage, appropriate USES thoroughfare diving sewage pump.

When diving sewage pump motor power is greater than or equal to 7.5 kW or outlet pipe diameter greater than or equal to the DN100, water pump fixed automatic coupling device can be used; When diving sewage pump motor power is less than 7.5 kW or outlet diameter less than DN100, can install a hose mobile. Wastewater collection pool with diving sewage pump drainage, should set the pump fixed automatic coupling device, convenient pump maintenance.

Drainage pump should be able to automatic start-stop and field manual start-stop. Pumps can run in parallel alternating more, also can be segmented in operation.

Adjustment methods of centrifugal pump and the energy consumption analysis

Through the analysis of the characteristic curves of centrifugal pump and pipeline system of centrifugal pump flow control main ways: export valve adjustment, pump variable speed adjustment and pump series, in parallel to adjust. Export was analyzed by using the characteristic curves of regulating valve and pump speed regulating energy loss in two ways, and has carried on the contrast, points out that the centrifugal pump with variable speed regulating flow than with export flow adjusting valve can better save energy consumption, and energy saving efficiency and the size of the flow changes. In practical application, you should pay attention to the range of speed regulation, can better use centrifugal pump variable speed control.

Centrifugal pump is widely used in chemical industry system of a kind of fluid machinery. It has to adapt to the wide scope of performance (including flow, pressure head and adapted to the nature of the medium), small volume, simple structure, easy operation, low operation cost, a lot of advantage. Usually, the selected centrifugal pump flow rate and pressure head may and asked for in line, or change due to the production task, technological requirements, at this time are required to adjust the discharge pump, essence is to change the working point of centrifugal pump. Centrifugal pump working point is by the characteristic curve of pump and piping system joint decision characteristic curve, therefore, any change of characteristic curve can achieve the purpose of flow control. At present, the centrifugal pump flow control ways are regulating valve, variable speed control and pump control and, series adjustment, etc. Due to all sorts of the principle of adjustment for different, in addition to have their own advantages and disadvantages, the energy loss is different also, in order to seek the best, the minimum energy consumption, the most energy-efficient way of flow control, must fully understand the flow of a centrifugal pump adjustment methods and the relationship between the energy consumption.

1 the main pump flow control

1.1 change the pipeline characteristic curve

Change the simplest method is to use centrifugal pump pump discharge valve to control the opening, the essence of which is the location of the change of pipeline characteristic curve to change the working point of the pump.

1.2 change the centrifugal pump characteristic curve

According to the proportion law and the law of cutting, change the pump rotation speed, the pump structure (such as the method of cutting impeller diameter, etc.) both methods could change characteristic curve of centrifugal pump, so as to achieve the purpose of flow adjustment, change the pressure head at the same time). But for the pump work, has changed the pump structure method is not very convenient, and because change the structure of the pump, reduces the versatility of the pump, even though it at some point adjustment convenient traffic economy [1], and rarely used in production. Just how changes in centrifugal pump flow of speed adjusting method. From figure 1, when change the pump speed adjusting flow rate decreased from Q1 to Q2, the pump speed (or motor speed) decreased from n1 to n2, speed under n2 pump characteristic curve of Q - H and the pipeline characteristic curve He = H0 + G1Qe2 (line curve does not change) to point A3 (Q2, H3), point A3 for the new speed adjusting flow after working point. The adjustment method of adjustment effect, quick, safe and reliable, can prolong the service life of the pump, save electricity, reduce speed running also can effectively reduce the NPSH of centrifugal pump NPSHr, away from the pump cavitation area, reduce the possibility of centrifugal pump cavitation occurred [2]. The disadvantage is that change the pump speed by variable frequency technology are needed to change the prime mover (usually) of the motor speed, principle of complex, investment is bigger, and the flow adjustment range is small.

1.3 pump series, and even the adjustment way

When a single centrifugal pump can't meet the delivery task, can use of centrifugal pump in parallel or in series operation. With two sets of the same type of centrifugal pump in parallel, although the head changed little, but increased the total transportation flow, the total efficiency of the pump in parallel with a single pump efficiency is the same; Centrifugal pump series when the total pressure head, flow rate change is not big, the total efficiency of the pump with single pump efficiency is the same.

Energy consumption analysis of two pumps under different adjustment modes

Analysis of energy consumption under different adjustment modes, the article in view of the present regulating valve and pump variable speed regulation is widely adopted by two types of regulation. Due to centrifugal pump and, series aims to improve the pressure head or flow, in the field of chemical industry use is not much, analyze its energy consumption can be combined with figure 2, the method is basically the same.

Pump selection principles and steps

Pump is a kind of a lot of wide range of general-purpose machinery and equipment, it is widely used in petroleum, chemical, electric power, metallurgy, mining, choose ship, light industry, agriculture, civil and defense departments, occupies an important position in national economy. According to 79 statistics, pump output reached 1.256 million units in China. Pump power consumption accounted for more than 21% of the national power consumption. So vigorously reduce pump energy consumption, to save energy use is of great significance.

Designed and developed in recent years, we have pump industry a lot of high efficiency and energy saving products, such as IHF, CQB, such as the FSB, UHB models of pump products, to reduce the energy consumption of the pump plays a positive role. But now in various fields of national economy, due to the unreasonable type selection, many of the running status of pump in the unreasonable operation efficiency is low, waste a lot of energy. And due to the unreasonable selection of pump, it was impossible to use, or use the maintenance cost increases, the economic benefit is low. Therefore, reasonable choose pump is of great significance to save energy.

So-called reasonable selected pump, is to consider investment and operation cost of pump unit and pumping stations comprehensive technical and economic indexes, such as make it conform to the principle of economy, safety and applicable. In particular, has the following several aspects:

Must meet the requirements of the use of flow and head, requiring the pump running work time points (device characteristic curves with the pump performance curve intersection) often remain within the range of efficient operation, save power and not easy attaint parts.

The choice of the pump should not only small volume, light weight, cheap, and has good characteristics and higher efficiency.

Has good resistance to cavitation performance, this can not only reduce the pump room of the excavation depth, and the water pump cavitation occurs, smooth operation, long service life.

Built according to the selected pump pumping station, the project less investment, low operating cost.

The second section selection steps

A basic data, list:

1, the characteristics of the medium: the name of the medium, specific gravity, viscosity, corrosive, toxic, etc.

In 2, medium contained in the body of particle diameter, how much content.

3, medium temperature (℃)

4, need traffic

General industrial pump can be ignored in the process of pipeline system leakage, but affected by the change of flow must be considered. Agricultural use, if is adopted, open channel water pump must also consider leakage and evaporation.

5, pressure: suction tank pressure, water pressure, the pressure drop of pipeline system (head losses).

6, pipeline system data (diameter, length, kinds and number of pipeline accessories, vacuum pressure to the pool geometry level, etc.).

Should also make the device characteristic curve, if necessary.

Decorate in the design line, should pay attention to the following items:

A, reasonable choose pipe diameter, pipe diameter is big, under the same flow rate, liquid flow velocity is small, small resistance loss, but the price is high, the pipe diameter is small, can lead to resistance losses increase sharply, increase the selected pump lift, installed with power increasing, the cost and operation cost are increased. So from the perspective of technical and economic comprehensive consideration.

B, discharge pipe and pipe joints should be considered are the biggest pressure.

C, pipeline layout should decorate straight pipe as far as possible, try to reduce the attachment and try to narrow the pipe length, pipe must turn, elbow bend radius should be 3 ~ 5 times the diameter of the pipe, as much as possible Angle is greater than 90 ℃.

D, the discharge side of the pump must be installed with the valve (ball valve or valve, etc.) and check valve. Used to adjust the point of pump, valve check valve when the fluid flow reversal can prevent the pump inversion, and makes the pump to avoid water hammer blow. (when the liquid flow back, will produce a great reverse pressure, make the pump damage)

Ten reasons and solutions of Pump lift not enough

Weihu pump industry in the past for the user maintenance encountered problem in the process of water pump is not enough, one of them is water pump lift weihu pump industry pump maintenance technicians here today to simple about the cause and the solution, the pump head is not a lack of enough pump head might mechanical electrical system may also have reasons.

Pump lift is not the cause and the solution

One of the reasons for pump head is not enough, liquid contains excessive amounts of air or gas. Solution: reduce the liquid temperature out of gas.

Pump head is not enough for another, the speed is too low. weihu pump industry solution: check whether the voltage is in the range of rated voltage, check whether the motor running normally.

The cause of the pump head is not enough 3, motor turn to right. weihu pump industry solution: because the power of fire against money and zero line, changing a line, the problem is human reason, is generally not easy to appear.

Four of the cause of the pump head is not enough, the total head above water pump design head. Solution: replace the head higher levels of the water pump.

Five of the cause of the pump head is not enough, the concentration of the liquid and the design value. Solution: replace conform to the requirements of the pump.

Six of the cause of the pump head is not enough, the operation flow rate is far lower than the minimum flow. weihu pump industry solution: replace conform to the requirements of the pump.

Seven of the cause of the pump head is not enough, abrasion and ring. Solution: replace the qualified new wear ring.

Eight of the cause of the pump head is not enough, the damage of impeller. Solution: replace the qualified new impeller.

Nine of the cause of the pump head is not enough, resulting in pump head gasket damage caused by internal leak is not enough. Solution: replace the qualified new gasket.

Ten of the cause of the pump head is not enough, sundries mixed in the pump, the impeller and port blocked. Solution: remove the pump clear clutter.

What are the cause of the pump not flow water?

 Shanghai weihu pump industry to provide users with the pump maintenance encountered in the process of various types of failures, specifically today there is not the cause of the water pump? In the past we also encountered many pump without water, so we have what are not the cause of the water pump as a summary, said below mentioned possible reasons one by one.

A, suction side issues

1, and there is no water injection pump

2, water pump or suction tube is not completely filled with liquid

3, suction head is too high, more than the pump capacity

4, suction pressure is too close to the liquid pressure gasification

5, air pockets in the suction side

6, suction side not fully immersed in a liquid

Second, the system reason

1, the speed is too low

2, motor turning right

3, total head above water pump design head

4, improper operation

Second, the mechanical reason

The impeller is influenced by external factors.

Above is a summary of what are not the cause of the water pump, of course, there could be other reasons, so much the cause of water pump water not may appear a few projects at the same time coexist,  weihu special remind what kind of reason is specific to on site need to be given, to ensure accurate quickly remove the water pump is not a failure.

Submersible pump failure phenomenon and elimination method

First, not out of the water pump, indirect water or water yield

1, check the motor. To see if the motor has to check motor starting not starting to eliminate circuit fault can be  whether motor wiring connection correct check whether electric pump reverse electric pump reversal switch power supply cord.

2, check the line. Look after the road if there is a wall, rupture, filter water blockage. If the pipeline rupture should be repair welding or in tube unclog fault can be ruled out.

3, check the pump casing seal check whether the impeller is damaged. Elimination method  change the new seal, impeller.

Second, the motor can't start with hum

1, check whether a motor circuit breakers check whether the voltage is the voltage is too low. After repair, adjust voltage normal fault can be ruled out.

2, check whether there is foreign body inside the impeller, the bearing damage to remove foreign bodies or replace the bearing.

Three, current is too large, ammeter pointer swing

1, when buying a new pump for shaft bending, bearing different heart immediately get back the sales department or factory.

2, check whether the thrust bearing is badly worn impeller with ring friction marks. Elimination method replace the thrust bearing and thrust plate of the impeller rotates with sealing ring friction can no longer.

3, check the shaft and the shaft when relative rotation is flexible rotation is not flexible, should replace or repair the bearings.

4, dynamic water level dropped to below inlet. Traffic shall be reduced or in the well.

Four, severe vibration unit operation

1, check whether the connecting bolt is loose bolts should be tightened.

2, a motor rotor imbalance, imbalance of water pump impeller, motor or the pump shaft bending failure should be sent after the factory for processing.

Water pump overhaul time, pump overhaul period

Water pump overhaul time, pump overhaul period

Water pump overhaul period according to the operation and technical conditions to determine of the unit. SL255-2000 "pumping technology management discipline" regulation for pump overhaul cycle: the main pump for 3 to 5 years or run a 2500-15000 hours, the main motor 3 to 8 years or run a 3000-20000 hours. And according to the situation in advance or delay the overhaul.

When determining pump overhaul cycle and workload, attention should be paid to the following aspects:

(1) if there are no special requirements, avoid removing technology can good parts and institutions.

(2) should try to extend the repair cycle. According to the wear and tear of spare parts, the operation test of similar equipment, equipment runtime performance indicators to determine the pump overhaul period, regardless of the wear of some parts. Therefore, should have a plan to overhaul, in order to ensure the normal operation of the unit.

(3) avoid remove all parts of the body, especially the precision and smoothness, cooperate with the parts, which need high institutions.

The advantage of the sewage plant using sewage pump parsing

Sewage plant for processing production using sewage submersible pump, can will get the robustness of the play, the effect of water treatment is mainly manifested in the following two benefits:

First, strong corrosion resistance

This kind of wastewater treatment will inevitably encounter strong acidic or alkaline substances exist, when the use of this kind of submersible pump will change in the resistance to corrosive effect, because of that it is making more friends to realize its special performance.

Sewage submersible pump in pollution resistance on the performance of the obtained the effective processing and change, have the opportunity to know and see, bring more friends very good effect.

Second, prevent plugging ability

Because the sewage submersible pump itself requires water processing and processing, so also increased on the ability of anti clogging. Use of such materials for promotion and application, let more people to realize the existence of its dominant role. Because there will be a lot of garbage composition of sewage, will inevitably affect the normal water effect to prevent clogging submersible pump at this point if you can choose to come to production and processing, believe that will reach the ideal mode in effect.

Pump selection principles and steps

Pump is a kind of a lot of wide range of general-purpose machinery and equipment, it is widely used in petroleum, chemical, electric power, metallurgy, mining, choose ship, light industry, agriculture, civil and defense departments, occupies an important position in national economy. According to 79 statistics, pump output reached 1.256 million units in China. Pump power consumption accounted for more than 21% of the national power consumption. So vigorously reduce pump energy consumption, to save energy use is of great significance.

Designed and developed in recent years, we have pump industry a lot of high efficiency and energy saving products, such as IHF, CQB, such as the FSB, UHB models of pump products, to reduce the energy consumption of the pump plays a positive role. But now in various fields of national economy, due to the unreasonable type selection, many of the running status of pump in the unreasonable operation efficiency is low, waste a lot of energy. And due to the unreasonable selection of pump, it was impossible to use, or use the maintenance cost increases, the economic benefit is low. Therefore, reasonable choose pump is of great significance to save energy.

So-called reasonable selected pump, is to consider investment and operation cost of pump unit and pumping stations comprehensive technical and economic indexes, such as make it conform to the principle of economy, safety and applicable. In particular, has the following several aspects:

Must meet the requirements of the use of flow and head, requiring the pump running work time points (device characteristic curves with the pump performance curve intersection) often remain within the range of efficient operation, save power and not easy attaint parts.

The choice of the pump should not only small volume, light weight, cheap, and has good characteristics and higher efficiency.

Has good resistance to cavitation performance, this can not only reduce the pump room of the excavation depth, and the water pump cavitation occurs, smooth operation, long service life.

Built according to the selected pump pumping station, the project less investment, low operating cost.

The second section selection steps

A basic data, list:

1, the characteristics of the medium: the name of the medium, specific gravity, viscosity, corrosive, toxic, etc.

In 2, medium contained in the body of particle diameter, how much content.

3, medium temperature (℃)

4, need traffic

General industrial pump can be ignored in the process of pipeline system leakage, but affected by the change of flow must be considered. Agricultural use, if is adopted, open channel water pump must also consider leakage and evaporation.

5, pressure: suction tank pressure, water pressure, the pressure drop of pipeline system (head losses).

6, pipeline system data (diameter, length, kinds and number of pipeline accessories, vacuum pressure to the pool geometry level, etc.).

Should also make the device characteristic curve, if necessary.

Decorate in the design line, should pay attention to the following items:

A, reasonable choose pipe diameter, pipe diameter is big, under the same flow rate, liquid flow velocity is small, small resistance loss, but the price is high, the pipe diameter is small, can lead to resistance losses increase sharply, increase the selected pump lift, installed with power increasing, the cost and operation cost are increased. So from the perspective of technical and economic comprehensive consideration.

B, discharge pipe and pipe joints should be considered are the biggest pressure.

C, pipeline layout should decorate straight pipe as far as possible, try to reduce the attachment and try to narrow the pipe length, pipe must turn, elbow bend radius should be 3 ~ 5 times the diameter of the pipe, as much as possible Angle is greater than 90 ℃.

D, the discharge side of the pump must be installed with the valve (ball valve or valve, etc.) and check valve. Used to adjust the point of pump, valve check valve when the fluid flow reversal can prevent the pump inversion, and makes the pump to avoid water hammer blow. (when the liquid flow back, will produce a great reverse pressure, make the pump damage)

Second, determine the flow head

The determination of traffic

A, if the production process has been given minimum, normal and maximum flow rate, should be taken into account by the maximum flow.

B, if give only normal flow in the production process, should consider to have a certain margin.

For ns >; 100 large capacity low the unpreparedness head pump, flow take 5% allowance, ns <; 50 small flow and pump, the flow take 10% allowance, 50 ns pump of 100 or less, or less traffic allowance is 5%, the pump of the inferior quality and operating conditions, traffic allowance shall be 10%.

C, if the basic data only to weight rate, should be converted to volume flow.

Pump valve enterprise how to deal with the opportunities of the pump valve market

Pump valve in our country enterprise in the full of a lot of good news in 2016. In addition to the domestic many industrial projects to restart the pump valve is expected to pull the market demand, more conducive to enterprise development of valve of the related policy also helps to break the pump valve industry development continued downturn, to have unlimited business opportunities. So the domestic pump valve enterprises comply with what kind of attitude, look for the industry development direction and get a bigger development?

Adhere to the concept of the development of technology, production can not shake. As is known to all, pump valve products in the process of the industrial development of our country occupies the extremely important status, the basis of its in the development of China's industrial economy has an irreplaceable role. So keep the healthy development of this industry has very important practical significance. And technology optimization, the road to improve product core competitiveness is the Chinese pump valve enterprise win the market, constantly big key to stride forward. According to statistics from CNPV alliance, pump valve enterprises on technology, every year must be accounted for more than twenty percent of annual revenue to ensure the scientific and reasonable development operation, in which technological factors of importance is self-evident.

While maintaining the development of small and medium-sized enterprises scale, try to go the way of large pump valve enterprise development into the trend of The Times. Competition is actually a competition in power market. For the pump valve enterprises in our country, mostly in small and medium-sized management present situation, difficult to form their own fist project in the market competition and advantage. So how to integrate the existing resources, how to put the scattered go offered in large group enterprises, big industry development way, is that we control the market, the key to grab more profit. In our country, according to CNPV union especially coastal zhejiang, Shanghai, has begun to try to carry on the comprehensive utilization of resources, scale development pattern, and good results have been achieved.

Competition awareness, adhere to the scientific marketing development. In the current context of the global economic recovery, and how to seize the development opportunity, how to improve the consciousness of competition decides the pump valve enterprise can obtain the key to long-term development. Think about CNPV alliance, the improvement of the pump valve domestic enterprises should start from the sales way, the use of marketing channels and market according to the actual needs of all-round ready to adhere to the scientific way to develop marketing to better meet the needs of the development of pump valve market. In addition to this our ready to deal with domestic market competition, more ready to cope with foreign monk "invasion".

So in front of the pump valve market is full of unlimited business opportunities, but whether the enterprise to take the scientific and reasonable measures, whether to have a positive attitude to deal with, decide the enterprise the key to seize business opportunities.

Sewage pump used in everyday life

Pumps are widely used in our daily life, whether professional or our daily life, pump are constantly in operation. Pump is a kind of machine is mainly used to transport the liquid, such as oil, water, acid alkali solution, emulsion, suspending liquid and liquid metal, the pump at the same time can also transport a mixture of gas and liquid. Thus, pump plays an indispensable role in life. There are several kinds of pump, and our life is closely related to the way the sewage pump, as the name suggests, the sewage pumps are mainly used to transport sewage, waste and contain fiber and other solid particles in the liquid medium, is closely related to human life. But due to the sewage pump to transport the liquid containing a large number of impurities, so the pipeline also relative to the other pump is easy to jam, once the pipes are blocked, urban sewage will not go out, the great influence to urban life and the environment. Blocking resistance, therefore, become the important measure of a sewage pump quality or not. At present is mainly applied in the sewage pump sewage submersible pump, it is a kind of non-clog pump, can enter into the pipe in the wastewater of sewage filter before, let the impurity in the sewage pipeline not easily, so it is widely applied in urban construction. Among them, the mine submersible pump is widely used, it is a kind of displacement is bigger, compressive ability better pumps, so bigger changes in water level and the depth of the water flooded more occasions application. At present, there are all kinds of pumps are a lot of kinds, style, brand, if there is need to install pumps, must choose carefully, to choose cost-effective, economic and durable water pump.

The use of submersible pump and maintenance

use and maintenance

1. Start:

(1) the following 11 kw pumps allow direct start, 13 kw or more pumps should be equipped with step-down starting cabinet, to protect the safe operation of electric pump.

(2) in order to avoid the electric pump rotor moment and reduce the starting load, electric pump start-up time should be the outlet valve stroke off to 3/4. (leave a quarter of the air gap. In order to put gas) to start after the water slowly open, to pump under control in the appropriate position.

(3) started running after the start, should strengthen the supervision and the observed water level change, ensure pumps within the scope of the condition of operation, can be put into operation after pumps running smoothly.

(4) pumps in operation for the first time after five hours, stop quickly measuring thermal insulation resistance, its value is not less than 0.5 M Ω, can continue to use.

2. Stop the pump:

Before electric pump stop, to prevent the backflow of water, at the same time of cut off the power to close the valve, restart time every 20 minutes.

3. The operation and maintenance:

(1) pumps should be to work in the design point, the axial force is moderate, pump efficiency is highest, the most economical and reliable. (2) pumps every work 8 hours to full check, each instrument for change, whether the circuit nodes fever, voice is normal. Whether the normal working current is greater than the motor nameplate rating.

4. One of the following circumstances, should immediately stop the pump:

(1) the working current of the pump suddenly above the motor rated current

(2) the water yield is not normal, gap water, sediment concentration increased

(3) the motor insulation resistance is lower than 0.5 ohms

(4) has obvious noise vibration of unit

(5) power grid voltage is not enough, less than 5% of the rated voltage

(6) the fuse burned a phase

(7) delivery road damage

5. Matters needing attention in operation and maintenance:

(1) check that the current voltage and discharge pressure every day, every 2 weeks testing dynamic water level, and make records.

(2) every four weeks to check the insulation resistance of motor and make records.

(3) use of start times to reduce as far as possible.

(4) pumps if well under discontinuous after use, should boot up once a week, and run the 5-10 minutes, to prevent pumps for corrosion can't start.

6. Electric pump storage and handling:

Store to put a net electric pump motor cavity effusion, dry surface, shaft coupling head to besmear antirust oil, erected in place. (in order to prevent the rotor deformation) in a dry, no chemical corrosive articles, normal temperature, winter storage of not less than 3 ℃ temperature.

How to use the safe and efficient mining multistage pump?

Mine multistage pumps suitable for mines, factories and urban water supply and drainage, used to transport water without solid particles or liquid, physical and chemical properties similar to Yu Qingshui scope and area is very broad. Devices commonly used shaft seal packing seal, according to user needs can also adopt mechanical seal. Equipment operation direction from the motor end looked pump is clockwise. How to use the safe and efficient mining multistage pump? This is used at the beginning of many users often ask the question. First of all, we from the pump to introduce oneself: pump sealing is very good - water section, middle/water was still in combination with surface molybdenum disulfide seals, also has the gasket seal paper, tear open after reshipment seal must use raw materials, to prevent water from entering the bearings on both ends, "O" type of synthetic and hydrosphere sealing. Rotational part and fixed part of the pump by the sealing ring, between the guide vane and packing. Packing chamber zhongtong into a certain pressure of water, water seal and cooling effect.

In the process of running often should pay attention to the following:

1. Observe the ammeter, listen to sounds, determine whether normal operation;

2. Observe whether motor overload, it is strictly prohibited to motor current operation;

3. Observe the shaft seal leakage situation, and adjustment, to adjust the injected water, sometimes with continuous dropwise is preferred;

4. Check the oil ring sliding bearing rotation. The temperature of the rolling bearing should be less than 75 ℃;

5. Check the clearance between the two coupling, when in need to replace the balancing device;

6. Observe the equalizer pipe of the water temperature, when the water temperature rise quickly, should stop pump check whether the balance pipe is blocked;

7. Observe the pressure gauge, vacuum gauge, when both gage pressure is abnormal, should be timely find out the reason;

8. Observe the water level to prevent light;

9. When the water level low note two shaft seal will inhale into the pump;

10. Pay attention to the operation condition of the pump, cooling water conditions.

Should not have to pay attention to is multistage pump under the condition of the outlet valve full close for a long time; Work shouldn't hump in the performance curve. Should ensure feed line during the operation of the valve is fully open on the road. The starter valve closing time shoulds not be long. No more than 2 ~ 3 min, otherwise, cause vaporization temperature, can damage the pump.

The centrifugal pump the causes of common faults and processing methods

In the feed water system, water pump in a running condition, often used for a variety of fault make water pump can't work normally. The centrifugal water pump common fault, causes and handling methods:

1. The pump is not water

(1) when the water pump suction pipe for down slope inside of air, gas, and has set up a water pump can't continuous suction caused by the water pump is not water. When there is a down slope, the slope should be adjusted, and timely troubleshooting the air pump body and suction tube.

(2) suction bottom valve is lax or damaged, the suction pipe under water, or bottom valve and water intake were choked up with silt sundry, to close the bottom valve is lax. When after confirm the fault should be timely clean up dirt, bottom valve, the damage should be replaced.

(3) the bottom valve submerged depth can also cause the pump is not enough water, should increase the depth of the suction pipe dipped in the water.

(4) tank (tank) water level is too low will make the water pump is not in the water, at this time should check whether the water into the water, the water pressure in the system is woefully inadequate, ball valves, liquid level control valve malfunction. Find problems should timely adjust the filling time (e.g., use of slack when water filling water at night), the inlet valve repair or replacement failure.

2. The submerged depth of the water pump water yield decrease except check suction, suction pipe down slope to save gas and other reasons, still need to check whether the water pump impeller sealing ring is damaged, and the timely replacement.

3. The water pump bearing overheating when the pump is running, the bearing temperature rise should not be more than 60 ℃, when bearing the lack of oil or water pump and motor shaft different heart, bearing gap is too small, too tightly on the packing, all can cause bearing overheating. At this point, we should adjust the concentricity, refueling, adjust the packing gland firmness.

4. The pump running vibration and noise is too big.

Pump concentricity deviation is too large will produce larger vibration, the second should check if the anchor bolts, foundation bolts tightened without loose. To require strict control of noise and vibration of buildings should increase vibration or vibration isolator.

When the depth of the suction pipe is too large, water when the water level is too low, will cause the water pump cavitation phenomenon and increase the pump noise.

The basic construction of self-priming centrifugal pump and the inlet piping requirements

The basic construction of self-priming centrifugal pump is composed of six parts, respectively, impeller, pump body, pump shaft, bearing, seal ring, stuffing box.

1, is the core part of self-priming centrifugal pump impeller, strength higher than that of its speed, on the impeller blades and play a major role, the impeller through static balancing experiments before assembly. Impeller on the inside and outside for smooth surface to reduce friction loss of water.

2, the pump body also calls the pump shell, it is the body of the pump. Support fixed effect, and connected to install bearing bracket.

3, the role of pump shaft is connected by coupling and motor, the torque of the motor to the impeller, so it is a major part of the mechanical energy transfer.

4, bearing is set on the pump shaft support components of pump shaft, which has two kinds of rolling bearing and sliding bearing. Rolling bearing use butter as a lubricant oil is generally appropriate for two-thirds to three-quarters of the volume too much will be fever, too little and there was a noise and fever! Sliding bearing is using a transparent oil as lubricant, go to the oil level line. Too much oil leak to the pump shaft and floating base, too little bearing overheating and burn out cause an accident! Bearing has the highest temperature in the process of pump working in 85 degrees generally run around 60 degrees, if the high will find reason (if there are impurities, oil is black, whether water) and processed in a timely manner!

5, sealing ring, also known as minus leakage ring. Import and pump impeller shell gap between in the cause of high water in the pump by means of this clearance flow to the low pressure area, affect the water yield of pump, efficiency! Clearance starts to cause the impeller and pump casing friction wear. In order to increase the flow resistance reducing internal leakage and delay the service life of the impeller and the pump shell, the pump casing and impeller around the foreign aid junction with sealing ring, sealing gap in between 0.25 ~ 1.10 mm is advisable.

6, stuffing box is mainly composed of filler, seal ring, packing, packing gland, water tubes. The role of the stuffing box is mainly in order to close the gap between pump casing and pump shaft, don't let the flow within the pump does not flow outside to not let outside air into the pump. Always keeping the vacuum inside the pump! When the pump shaft and be about to rely on water seal packing friction heat to hold water to the water seal circle packing cooling! Keep the pump running. So in the process of pump run Tours of inspection to check the stuffing box is paying special attention to! Running about 600 hours will be carried out on the packing replacement.

Pipeline centrifugal pump performance curve and the eight use erroneous zone

Pipeline centrifugal pump performance curve

There are three main pipeline centrifugal pump performance curve curve: flow - head curve, traffic - power curve, traffic - efficiency curve.

A, flow - head characteristic curve

It is the basic of centrifugal pump performance curve. Specific speed is less than 80 of the centrifugal pump has the characteristics of rising and falling (curved) under both raised among, both sides, said hump performance curve. Specific speed centrifugal pump has between 80 ~ 150 flat performance curve. Than revolutions in the more than 150 centrifugal pump has a steep fall in the performance curve. Generally said, when the traffic hours, head high, with the increase of traffic head will gradually decline.

B, flow - power curve

Shaft power is increases with flow rate, when the flow rate Q = 0, the corresponding shaft power is not equal to zero, and to a certain value (about 60% of the earth's normal operation). The main power consumption on the mechanical loss. Is full of water in the pump at this time, if the long run, will lead to pump temperature rising, the pump shell, bearing will be fever, serious when can make the pump body thermal deformation, we called "stuffy head", the head of the maximum, when gradually open the discharge valve, the flow rate will gradually increase, shaft power also slowly increase.

C, flow - efficiency curve

Xiangshan head shape, its curve when the flow rate is zero, efficiency is also equal to zero, with the increase of flow rate, efficiency is also increased gradually, but efficiency has decreased after increased to a certain value, there is a high efficiency, near the highest efficiency point, efficiency is high, the region known as the high efficiency area

Eight pipeline centrifugal pump use erroneous zone

A, pipeline centrifugal pump pipe way of matching

Some pipeline centrifugal pump users think it can improve the actual lift, but the actual head loss = total head ~ head of pump. When the water pump model is determined, the total head is certain; Head loss mainly comes from the pipeline resistance, the smaller the diameter is obviously the greater the resistance, and therefore the greater the loss of head, so reduce the pipe diameter, the actual head of pump instead of increased, it will reduce, to lower the pump efficiency. By the same token, when small diameter water pump with large water pumping, also won't erode the real value of the pump head, may because of the line in order to reduce the loss of the head with the decrease of the resistance, the actual lift have improved. There is also a machinist think small diameter water pump with large water pumping, will greatly increase the motor load, after they think diameter increases, the water in the outlet pipe of pump impeller pressure is big, so will greatly increase the motor load. Little imagine, the size of the liquid pressure only associated with head high and low, and have nothing to do with the size of the pipe sectional area. As long as the head must be, water pump impeller size remains the same, no matter how big pipe diameter, pressure effect on the impeller is certain. Just pipe diameter increases, the flow resistance will decrease, and make the flow rate increases, power consumption are increasing. But as long as within the scope of rated head, no matter how to increase the pump diameter can be normal work, and also can reduce line losses, improve the efficiency of the pump.

Second, high lift water pump used for low-lift pumping

Some pipeline centrifugal pump users think the lower water head, the smaller the motor load. Under this false understanding of misleading when water pump of choose and buy, often the selection of the pump head high. In fact for the centrifugal pump, when the water pump model is determined, the size of the consumed power is proportional to the actual flow pump. And pump flow will decrease with the increase of the head, and the higher the head, the smaller the flow, and the smaller power consumption. Conversely, the lower the head, flow rate, the greater the consumption of power. Therefore, in order to prevent the motor overload, general requirements the actual water use head of the pump shall not be less than 60% of the labeling head. So when the high-lift pump used for low head pumping motor easy to overload and fever, serious when can burning motor. If emergency use, must be in the outlet pipe with a gate valve is used to adjust the water yield (or use the content such as wood wall small outlet), to reduce the flow, to prevent the motor overload. Pay attention to the motor temperature rise, if discover motor overheating, should be timely down outlet flow or turn it off. It is also easy to produce misunderstanding, some machinist think blocking outlet, forced to reduce traffic, can increase the motor load. In fact just the opposite, formal power centrifugal pump irrigation and drainage units are fitted on the outlet pipe of gate valve, in order to reduce the unit startup motor load, should be closed gate, after waiting for motor start and gradually open the gate. 

Deep well submersible pump installation and use of the method

1. Deep well submersible pump acceptance: user acceptance check carefully to the logistics company delivery cable sheath have damaged. Water pump with and without fracture.

2. Handling, loading and unloading car need to be careful, so as not to damage the concentricity of the unit or touch broken cable insulation.

3. A complete set of unit under well before the inspection steps: a. open mesh, even with all pry bar shaft should be flexible rotation, B put add fresh water, the electric pump shaft connected cable joint, with water immersion, joint rock joint to ground resistance measurement (single joint insulation resistance) of water value is not less than 500 ohms. C. put using suitable container to pump the water pump set of export with detergent water, at the same time point to move a little bit about the motor start button to see the pump steering, time shall not be more than 2 seconds, completes the sequential markers.

4. When pump fission transportation field assembly steps: a. before installation will put the motor to the vertical, open porosity and water injection hole, pay attention to must open the both water block, add fresh water to water plugging and water plugging is tightened, observe the motor if there is leakage phenomenon, if there is leakage phenomenon must not well, the reason may is the transport process of knock against, should contact the agent or manufacturer's talk things over solve, until not leak (10 ~ 15 minutes). And then shake test motor insulation resistance, the value of no less than 50 ohms. B. bandage cable joint, wrapped after try the steering motor, motor turns to the direction of the arrow marked on the pump are consistent, and sequential markers.

5. Submersible deep-well pump inspection when fission

A. on the pump shell is removed to show the top of the impeller, b. flexible c. rotating impeller by hand to see if the pump shaft direction pull the seven total amount up to observe the impeller impeller (QJ pump commonly 4 to 6 mm) d. install connecting shaft and motor into one to make the motor shaft head and pump shaft head of tight no cracks are allowed. E. jumped up and down the impeller clearance, should be in the middle of the amount of total channeling location (allowable deviation plus or minus 0.5 mm). F. when the deviation is greater than 0.5 mm in adjustment gasket to the middle position in hand rotating impeller should be flexible. G. then even the axis is the top wire holes, tighten the top wire installed on the shell. H. again even with all pry bar should be flexible rotation for a week and put shaft device. Then pretend to filter and convenient slot on the box.

6. Under the deep well submersible pump well, the well before the rope hanging a in units of the same length logs or steel pipe (diameter) unit is equal to the largest diameter test tube well is upright. In order to avoid the well stuck units.

(especially new well first pump, mine do not need this step).

7. The cable tie, cable to use insulation cable tie binding to raise water pipes, don't use metal wire.

8. Control of the unit and start: control equipment selection. Motor power by 1.2-1.4 = power control cabinet. Control cabinet to be lack of phase, overload, over current short circuit protection, etc. Started well after the installation of commissioning, startup time according to the difference of motor power, master between 10 to 25 seconds, high-power motor startup time should be relatively long, check whether the current overload, whether the three phase current balance and recorded. As the basis of warranty and feedback manufacturer.

9. Overload, short circuit, over current, lack of phase, debugging sensitivity: this step is very important, please installation personnel serious debugging.

How to increase the self-priming pump self-priming capacity?

Household self-priming pump is self-priming ability, can make the water pump in the high places in the low level of the liquid or water suction pump cavity through the impeller flung in a high speed liquid, to handle liquid and promotion purposes. Household self-priming pump the service life of the product is unqualified or too long, sometimes self-priming ability to drop, to reach the purpose we need, but self-priming pump because it is the different way of imbibition, can be divided into the mixed type self-priming pump, internal mixing type self-priming pump and powered by the pump itself water vacuum pump self-priming pump structure in the form.

Here are several ways to improve the service life of self-priming pump, self-priming ability:

The first way is also the most simple way: self-priming sewage pump set vacuum pump in the pump suction pipe on the road, before starting the pump, vacuum pump to start, first make the pump suction tube is full of water, first ensure the pump automatically, rapid start. This way of absorbing perfect automatic control system is needed to guarantee the normal work.

The second method relative to the following is also belongs to the relatively simple: self-priming pump to reduce the feed water pipe bend, drop height and horizontal intervals.

The third method is a bit of trouble, but also is very useful: self-priming pump set before the pump suction tank. This way needs to be on the water pump suction pipe to set up a water tank, pump before the first run, the tank should be artificial filled with water, the first run after resting, as a result of absorbing water tank inlet pipe height above the tube surface height, although the water level below the height of the tank water in tank, tank of water will not flow back, into the pool, so the water tank can store a certain amount of water, and as a result of the water tank outlet pipe (i.e., the water pump suction pipe) height below the tube surface height, so can ensure the pump suction pipe is full of water, water pump to run again, the water in the pitcher is draining pump, tank pressure, on the pool of water at atmospheric pressure under the action of supplement to the water tank, by absorbing water tank inside the pool.

Finally a way to self-priming sewage pump suction pipe end suction bottom valve installation. Suction bottom valve is actually a check valve, it ensure that water can only be by the pool in suction pipe and can't go back, so if the suction tube is full of water, although the pump axis elevation above the pool water level, but because of the suction bottom valve, the suction tube of water will not flow into the pool, can make the suction tube is full of water all the time, ensure the pump automatically, rapid start.