How to solve the problem of horizontal multi-stage pump

1.Horizontal multistage pump does not absorb water or water. The cause of this failure is mostly due to the end of valve stuck, part of the blockage of water, high water or water pipe leakage is too high. Should be checked one by one, taken at the end of valve repair, clear the blockage and correct the steering and other processing. 

 

2.Pipeline leakage or leakage. No more than nuts tightened due. If the leakage is not serious, can be applied to cement slurry, mud or soft soap in the leakage; if the joints Water Leakage, tighten the nut wrench can be used. Serious leakage, leakage, must be re assembled. 

 

3.Multi-stage centrifugal pump severe vibration. May be the motor rotor is not balanced or shaft coupling. Sometimes bearing wear, bending, rotating parts of the relaxation, rupture, pipeline stent is not strong also cause vibration. Should be adjusted, reinforcement, inspection or replacement. 

 

4.The impeller is bad. When the damage is not large, can be repaired. Hard alloy should be replaced or plated when the damage is serious. Completely damaged, the impeller should be removed, the repair shop to repair. 

 

5.Horizontal multi-stage pump shaft bending. Is due to the impact load, belt pulled too tight, causing incorrect installation. If the bend is not serious, can be used manually screw to correct, but not too hard, in case of a complete break. 

Structure of clean water horizontal centrifugal pump

1.Horizontal water centrifugal pump housing (that is, pump body and pump cover) to form a pump studio. Impeller, shaft and rolling bearings, etc. for the pump rotor. The suspension bearing part supports the rotor of the pump, and the radial force and axial force of the rolling bearing are affected by the pump. 

2.In order to balance the axial force of pump impeller, pump the most before and after is provided with a sealing ring, and a balance hole in the impeller hub, the axial force of pump impeller back some small, no sealing ring and balance hole. 

 

3.Axial horizontal centrifugal pump sealing ring is composed of packing gland, packing ring and packing etc., to prevent air or a large number of Water Leakage. The impeller of the pump if the balance cavity and impeller with soft packing suction port as the impeller inlet liquid in the vacuum state, it is very easy to intake along the surface of the shaft sleeve, the packing ring through the pump cover hole is arranged in the packing chamber, the pump room pressure water to fill material for sealing ring. If there is no balance hole of the impeller of the pump, the liquid pressure on the back side of the impeller is greater than the atmospheric pressure, so there is no leakage problem, therefore, the packing ring can not be filled. 

 

4.In order to avoid shaft wear, in the shaft through the packing chamber is equipped with protective sleeve. A quasi O type sealing ring between the shaft sleeve and the shaft, along with the surface to prevent intake or Water Leakage. 

 

5.Pump transmission is through the extension of the elastic coupling and motor coupling, the rotation direction of the pump, from the driver to see, for the clockwise rotation. 

Determine seal of the pipeline pump

1.Packing seal :

Pipeline pump packing seal structure is simple, cheap, easy to repair, but the leakage of large, large loss of supply and consumption. Therefore, the packing seal is used for conveying the general medium, such as water, which is generally not suitable for oil and chemical medium, and can not be used in the precious, explosive and toxic medium. 

2.Mechanical seal :

Mechanical seal (also known as end face seal) seal effect is good, little leakage, long life, but the price is expensive, processing and installation of maintenance is higher than the general requirements. The mechanical seal is suitable for transporting oil and chemical medium, and can be used for various kinds of medium with different viscosity, strong corrosion and granular medium. The American Petroleum Institute API610 (Eighth Edition) stipulates: in addition to the user specified, shall be equipped with container type mechanical seal. 

3.Dynamic seal :

Dynamic seal can be divided into two types of back blade seal and sub impeller seal. The pump when the leaves back (or vice impeller) of the centrifugal effect to medium pressure seal Bu to atmospheric pressure or negative pressure, the pump does not leak during operation. When the centrifugal force disappears, the back blade (or the auxiliary impeller) is sealed, and the sealing device is sealed by the stopping and sealing device. The packing seal is used in the parking and sealing device which is matched with the back blade (or the auxiliary impeller). Packing seal with ordinary and mechanical elastic two. With the general packing seal pump similar to ordinary type packing seal, seal requirements at the micro positive pressure, in order to avoid packing friction. Mechanical elastic filler parking sealed by weight, the pipeline pump packing at run time to loosen, stop packing. In order to ensure the service life of the sealing device, the leakage rate of the pipeline pump is reduced, and the pump inlet pressure of the pump is limited by the dynamic seal. 

Analysis on the problem of non drainage of deep well pump

1.The water inlet pipe and pump body with air :

1).Before the start of the deep well water pump, the water is not filled with enough water, sometimes it seems to be filled with water, but not to turn the pump shaft into the air completely discharged, resulting in a little air left in the water inlet pipe or pump body. 

 

2).Contact with the pump inlet of the horizontal application of reverse flow direction, fell more than 0.5% slope, deep well pump connected at one end of the highest import, not completely level. If the upward tilt, will be retained within the inlet air, reduced water pipes and pump in the vacuum, the impact of water. 

 

3).Deep well pump filler has been used for long-term wear or packing pressed too loose, discharge gap caused by the large amounts of water from filling with the shaft sleeve, the result is the outside air into the pump from the internal clearance, affected the water. 

 

4).Due to the long-term potential of the water pipe, pipe wall corrosion of the hole, the water continued to decline after the deep well pump, when exposed to the surface of these holes, the air from the hole into the water inlet pipe. 

 

5).There is a gap between the water inlet pipe and the water inlet pipe and the connection point of the deep well pump, it is possible to make the air enter into the water inlet pipe. 

2.The deep well pump speed is too low :

1).Artificial factors. Some users because of original motor damage, may be accompanied by another motor, resulting in a flow of small, low head or even the consequences of Sheung shui. 

 

2).The mechanical failure of deep well pump. Impeller and pump shaft fastening nut loose or pump shaft deformation and bending, resulting in multi impeller, direct friction with the pump body, or bearing damage, it is possible to reduce the speed of the deep well pump. 

 

3).Power machine repair problems. 

3.Other factors :

1).At the end of valve to open. Is usually set aside a long time due to the deep well pump, valve gasket is stuck, no washer valve may be rust. 

 

2).Impeller wear is serious. Impeller blades have been worn for a long time, which affects the performance of deep well pump. 

 

3).At the end of the valve filter network is blocked; or potential water valve at the end of the sludge layer caused by the blockage of the strainer. 

 

4).Gate valve can check the failure or blockage will cause the flow to reduce or even draw no water. 

 

5).The leakage of the outlet pipe also affects the amount of water.

 

Pump head of pipeline pump

Generally, the so-called pump head should contain the pump body and pump cover part. Pump body is mainly connected to the pump rotor, the impeller through the bearings, seal, bearing components connected. The pump cover is a part of the corresponding part of the pump body, and a closed cavity is formed together with the pump cover. The pump body and the pump cover is internally lined slurry pump. The lining of the material is generally rubber and high chromium alloy, according to the general conditions of industrial and mining conditions to choose the pump is a rubber or metal lining. 

1. When the pipeline pump starts to close the outlet valve, open the inlet valve, the pump must be filled with material, not allow leakage. 

2. Pump start test, check the direction of rotation, right after the opening, the pump operation. 

 

3. Adjust the outlet valve opening, so that the pump in the rated flow, head of the operating conditions. 

 

4. Close the outlet valve, and then cut off the power supply. If the ambient temperature is below the freezing point of medium, should pump the liquid out, to avoid the cracking equipment. 

 

Vertical horizontal pipeline pump manufacturers wholesale

Vertical horizontal pipeline pump manufacturers wholesale Where? Vertical horizontal pipeline pump manufacturers wholesale where cheap? Such a problem, whether it is pipeline pump pump or pipeline pump on behalf of the user, are very concerned about this issue, are looking for quality and cheap history of horizontal pipeline pump wholesale manufacturers.

Shanghai Weihu Pump Co., Ltd., is a professional pipeline pump production enterprises, the production pipeline pump products are: single-stage pipeline pump, light multi-stage pipeline pump, high-rise building water supply pipeline pump, stainless steel pipeline pump, horizontal pipeline pump etc The company's vertical horizontal pipeline pump sales cover the entire Shanghai urban area and sell well in Zhejiang, Jiangsu, Jiangxi, Guizhou, Hunan, Chongqing, Sichuan, Xi'an, Shanghai, Anhui, Henan, Gansu, Xinjiang and other provinces and autonomous regions.

The following is Shanghai Wei Shanghai pump according to the user consultation out of the pipeline pump manufacturers wholesale-related issues:

1. How about your pipeline pump products?

A: Hello, thank you for consulting our factory pipeline pump products, Shanghai Weihu Pump has decades of pipeline pump production experience, pipeline pump production experience, the production pipeline pump products tested by the national authority of qualified departments, you can rest assured buy.

2. What are the specific models of your pipeline pump products?

A: Hello, thank you for consulting our factory pipeline pump products, our company has vertical, horizontal pipeline pump products, with dozens of signal parameters pipeline pump products, you can step on the Shanghai Wei Shanghai pipeline pump product area specific understanding .

3. You are a pipeline pump manufacturers or brokers?

Our company is a professional pipeline pump manufacturer, our company in Shanghai, Henan, Jiangsu, Xinjiang, have a production base, you are welcome to visit the study tour.

4. Pipeline pump how many pieces from the grant?

A: I produced the Shanghai Wei Shanghai pipeline pump, one from the grant to support the blank area to join sales.

Pump water, pump self-priming pump, suction pump suction

【Diversion】

    In the pump industry, the water guide specifically refers to the water. Because some of the pumps before work, you must manually add water to make the pump interior to form a closed environment, pump parts and then movement to create a partial vacuum in order to allow external water pressure in the internal and external pressure by the atmospheric pressure into the pump inlet to complete the suction action . For example, the previous rural water tank, it must first increase the water, in order to suck up the water wells.

【Self-priming】 mainly used in pumps, pumps, is a more important parameter.

    1. The meaning of self-absorption

    As the name suggests, self-absorption refers to the ability to automatically absorb water, that is, before the pump work, even if all the water pipes in the case of the air, without pre-added water, the pump will automatically pump the water pumped down below Go.

    2. Self-priming principle

    When the pump is in the air, the negative pressure (vacuum) formed by the pump work will be lower than the water pressure of the pumping port under the action of the atmospheric pressure and then discharged from the water discharge end of the pump. This process does not need to add water (guide water). With this ability to pump called self-priming pump.

    Some centrifugal or rotary vane pump before the suction, must be added in the pump chamber to form a closed environment, and then pump the formation of negative pressure in order to achieve the purpose of water. Such as in rural areas before the manual pump. No self-priming pump, every time before adding water is very troublesome.

【Suction】 suction height is called suction. Units are generally meters;

    Also known as the maximum self-priming height. Ie the maximum height (the vertical distance of the pump outlet from the surface to be pumped) that is automatically pumped up without water. Our pumps are self-priming pumps, the standard suction process refers to this situation. Some centrifugal pumps do not have self-priming capacity, the first use must be added water for the job. Some diaphragm pumps, although there are self-priming capacity, but the suction process is often associated with the inlet pipe is all the air can draw the vertical height of the water gap, which please note.

    Suction of the level, with the pump power, flow, structure and so on, but limited by the size, power, general micro-pump self-absorption process is not easy to do higher, because a maximum pressure of water pressure The height of 10.3 meters (because of an atmospheric pressure ≈ 10.3 m water column pressure), so the maximum self-suction process is about 10.3 meters. However, in actual operation, due to sealing performance reasons, the suction is generally not more than 6.5 meters.

Precautions for Vacuum Pump Selection

Vacuum pump prices, rotary vane vacuum pump, vacuum pump selection

1, the ultimate pressure of the vacuum pump should meet the working pressure of the process. It is usually chosen that the pump's ultimate pressure is less than about one order of magnitude of the process requirement.

2, each pump has a certain working pressure range, therefore, the pump operating point should be selected within this range, and not allow it to work outside the long hours of work pressure.

3, the vacuum pump at its working pressure, should be able to drain away the vacuum equipment in the process of generating all the gas volume.

4, select the vacuum unit:

   (1) When using a pump can not meet the pumping and vacuum requirements, the need for several pumps together, complement each other to meet the process requirements.

   (2) Some vacuum pumps can not work at atmospheric pressure, the need for pre-vacuum; some vacuum pump outlet pressure is lower than atmospheric pressure, the need for the former pump, it is necessary to combine the use of the pump. The combination of the vacuum pump, we call the vacuum pump unit, which can make the vacuum system to get a better vacuum and displacement. We should choose the correct combination of vacuum pump, because different vacuum pump on the gas extraction requirements are different requirements, for example: in general, Roots - rotary unit is not suitable for containing more condensable gas system.

5. When you choose the oil seal pump, you should first understand whether your vacuum system is oil pollution requirements. If the rigorous requirements of oil-free equipment, should choose a variety of oil-free pumps, such as: water ring pump, cryogenic pumps. If the requirements are not strict, you can choose a pump, coupled with a number of anti-pollution measures, such as cold trap, block oil trap, baffle, but also to achieve clean vacuum requirements.

6, to understand the gas composition was pumped, the gas contains no condensable steam, with or without particulate dust, corrosive and so on. When selecting a vacuum pump, it is necessary to know the gas composition and to select the pump for the pumped gas. If the gas contains steam, particles, and corrosive gases, should be considered in the pump inlet pipe on the installation of auxiliary equipment, such as condensers, dust and so on.

7, when the choice of oil seal vacuum pump, to consider the vacuum pump discharged from the oil vapor (soot) on the impact of the environment. If the environment does not allow pollution, should choose oil-free vacuum pump, or the oil vapor to the outside.

8, the vibration of the vacuum pump work on the process and whether the impact of the environment, if the process does not allow, should choose no vibration of the pump or take anti-vibration measures.

9, the price of vacuum pumps, operation and maintenance costs.

   Once we have taken into account the various circumstances before we can finalize a solution for your adaptation:

   (1) the minimum investment costs.

   (2) the minimum production operating costs.

   (3) the first two cases a reasonable and even distribution of feasible option

Maintenance of Vertical Centrifugal Pump

Vertical Centrifugal Pump Maintenance  

In-service maintenance and repair

      1, the inlet pipe must be highly sealed, can not leak, leak;

      2, prohibit GDL vertical centrifugal pump in the cavitation state long-term operation;

      3, prohibits GDL-type vertical centrifugal pump running in high-flow conditions, the motor over-current long-term operation;

      4, regular inspection GDL vertical centrifugal pump running the motor current value, as far as possible within the scope of the pump design to run;

      5, GDL-type vertical centrifugal pump should be in the operation of care, in order to avoid accidents;

      6, GDL-type vertical centrifugal pump should run every 500 hours to refuel the bearing;

      7, GDL-type vertical centrifugal pump for long-term operation, due to mechanical wear and tear, so that the unit noise and vibration increases, should stop inspection, the need to replace the vulnerable parts and bearings, unit overhaul period is generally one year.

      Mechanical seal maintenance and repair

      1, mechanical seal lubricating fluid should be clean without solid particles;

      2, is strictly prohibited mechanical seal dry grinding in the case of work;

      3, start before the plate pump (motor) a few laps, so as to avoid a sudden start mechanical seal fracture damage.

Checking Method of No - load Operation of Motor for Deep Well Pump

When using the vertical deep well submersible pump, how to carry on the idling operation examination to the deep well pump electric motor. The following by our deep well pump manufacturers in Shanghai weihu and we simply talk about the inspection method.

    First, check the oil, the correct amount of oil should be in the middle of the oil marked the middle position. Oil shortage should be appropriate to add 10 mechanical oil, oil should be appropriate to put too much oil.

    Second, check the wiring is completed, you can electrify for no-load operation. If the motor does not turn should immediately stop, and the power cord of any two for another then start; if the motor has not yet started, you should carefully check the power supply system is not good, whether there is two-phase power supply or power is not connected.

    Third, the motor starts to complete the speed to stabilize, the motor should be parking for mechanical inspection. The mechanical connection parts such as the emergence of loose, falling or collision and other phenomena, should be adjusted and repaired.

    Fourth, the motor no-load operation should be continued for 2-3 hours, running in time to check for irregularities or sound appears. After the end of the operation check whether the bearing overheating situation. If there are abnormal circumstances, should be adjusted and repaired immediately.

Shanghai pump manufacturers to talk about when the pump overhaul need to pay attention to what

Pump overhaul cycle is based on the operation and technical conditions to determine the unit, "Pump Station Technical Management" provides that the pump overhaul cycle: the main pump for 3-5 years or 2500-15000 hours of operation, the main motor 3-8 years or 3000-20000 hours of operation. And may advance or postpone overhaul according to the situation.

    In determining the pump overhaul cycle and workload, we should pay attention to several aspects, the following by the Chinese pump manufacturers say as follows:

     First, if there is no special requirements, try to avoid disassembly technology can be good parts and bodies.

     Second, should try to extend the maintenance cycle. According to the wear and tear parts, similar equipment running tests, equipment performance indicators to determine the pump overhaul cycle, regardless of the wear of certain parts. Therefore, the overhaul should be planned in order to ensure the normal operation of the unit.

     Third, as far as possible to avoid the demolition of all components of the unit body, especially the precision, finish, with the requirements of high components, institutions.

Shanghai pump manufacturers to talk about the structure and cooling form of centrifugal pump

In the use of centrifugal pumps, we will reduce the centrifugal pump sealing temperature to improve the efficiency and service life of centrifugal pumps, the following by our Shanghai pump manufacturers to say,

    First of all, we say that the centrifugal pump seal structure

    1, single-ended centrifugal pump seal: the use of injection-type washing, washing liquid is about 100 ℃ by the second line of wax oil, the pressure than the sealed cavity high 0.05-0.15Mpa. Gland outside the use of hot water (soft water) for rapid cooling. One cycle (ten months) can be used in general.

    2, centrifugal pump metal bellows seal: compact, easy to install, in the case of the same auxiliary system, the life of 2-3 times the normal seal.

    3, centrifugal pump double-end mechanical seal: the cycle of washing, plus external cooling, life is single-sided 1.5-2 times.

    4, centrifugal pump friction pair selection hard to hard (YG6 / YG8, SiC / SiC, etc.), high viscosity, with a small amount of solid particles of the medium or crystallization of the media, have a good effect.

    Then we talk about the centrifugal pump cooling form.

    1, domestic centrifugal pump in the sealed chamber around the cooling water jacket set to cool the water, can seal the chamber temperature is reduced to 200-250 ℃.

    2, on the single-ended seal, the use of injection-type cleaning, from the outside lead clean, the temperature of about 100 ℃ wax oil (usually without diesel, because diesel is finished), both reduce the temperature and improve the working environment is effective Approach.

    3, gland outside the use of quench water; in addition to lower temperatures, but also to prevent clogging sewer.

Submersible pump repair and maintenance

Submersible pumps on a regular basis on the submersible pump and its control system for comprehensive maintenance, at least l times a year to do a comprehensive preventive maintenance, including:

    (1) when the vibration of the sound and voltage and current with or without abnormalities; stainless steel multi-level deep well submersible pump

    (2) start the device is working properly;

    (3) whether over-temperature water leakage alarm;

    (4) whether the multi-protection established by the measurement and control is frequent;

    (5) the main cable and control cables are aging and cracking;

    (6) whether the main contactor sticky oxidation or burr;

    (7) thermal relay settings are correct;

    (8) whether the winding insulation signs of aging;

    (9) Insulation resistance to ground is too low;

    (10) three-phase winding resistance is balanced;

    (11) the stator rotor to ask whether there are sweeping or scratches;

    (12) control system level gauge is accurate;

    (13) whether the upper and lower limit output is normal and reliable;

    (14) whether the float action is reliable;

    (15) whether the temperature detection components aging malfunction;

    (16) whether the oil emulsification;

    (17) mechanical seals are intact;

    (18) bearing with or without wear;

    (19) impeller wear or cavitation;

    (20) whether the shaft rust deformation or wear;

    (21) whether the motor inside and outside fastening screw loose;

    (22) cooling jacket and circulating water pipes in the presence of debris;

    (23) whether the pump and the surrounding sediment deposition or blockage.

    In the preventive maintenance and submersible pump operation process, should be correctly distinguish between over-temperature alarm, the alarm is really over-temperature or aging components of the malfunction. In the case of component aging, the signal will only access the alarm signal, not to directly participate in control, to reduce the frequent start of the submersible pump.

    Frequently Asked Questions in Maintenance Work Submersible pumps are immersed in water for long periods of use, causing the aging of the main cable skin to crack. Water penetrates the cable directly into the submersible pump. Therefore, it is necessary to inspect the cables regularly, Cracks, cleaning the surface of the cable after cleaning, waterproof tape can be used for waterproofing, but be careful to soak a few hours after the insulation check with a shake table to meet the requirements before put into operation. Replace the main cable with an insubstantial or non-repairable value. Because the main cable is a watertight connector with a dedicated cable, the replacement price is more expensive, so the process can be used to save costs of bonding.

    In the daily inspection, in addition to full operation control, test instruments, but also to display their subjective active role, as Chinese medicine practitioners to diagnose the disease "look, smell, ask, cut" as abnormal pump abnormalities. "Look" is to see, take a look at the instructions of various ministries pressure, flow, temperature, current, voltage is normal, the pump components have deformation, discoloration, change and whether the leak, with or without plugging; Smell, smell the unusual taste, liquid hydrocarbons, gasoline, benzene and other smells of leakage, equipment, paint, rubber and other insulation burnt paste paste taste; "ask" is to listen, listen to the voice of the rolling sector, with or without Abnormal sound, such as water hammer, friction sound, percussion, vortex sound, breaking sound, etc .; "cut" is to touch, touch whether overheating, vibration and so on. Only in this way the role of the operator, in a variety of test instruments, instruments of assistance, can the daily inspection well, early detection of anomalies, preventive measures.

How to reduce the energy consumption of submersible pumps?

How to reduce the energy consumption of submersible pumps?

We all know that in the summer is the peak of water, so the pump on a good maintenance of some, began to use, then in the course of how we like to reduce the energy consumption of wells with submersible pumps?

Here we will explain in detail for you some:

First, the pump surface and pressure water chamber (also known as volute) on the surface rust.

Surface corrosion bumps will reduce the pump water 7% -8%; maintenance only steel brush and iron sandpaper or grinding wheel smooth, you can make it in the work of fuel consumption or power consumption reduced by 9% -14%.

Second, the seal ring gap increases

According to the test when the impeller radius in the direction of the gap increased by 4 mm, the pump water will be reduced by 10%; maintenance only with organic adhesive plus asbestos back to the factory-defined gap, you can make the pump fuel consumption at work or electricity Consumption reduced by 10% -12%.

Third, the pressure chamber and impeller axis does not coincide

When the pressure chamber and the impeller axis deviation of 2 mm or more than 2 degrees, the pump water will be reduced by 5% -6%; maintenance only careful measurement, carefully identify the axis coincidence of the location of the installation of a solid, you can make the pump Reduced oil or power consumption by 6% to 7% during operation.

Pipeline pump manufacturers to talk about how to adjust the pipeline pump flow

When using the pipeline pump will encounter the need to adjust the flow of time, the following by our pipeline pump manufacturers in Shanghai Weihu pump for everyone to talk about what methods to adjust the pipeline pump flow.

 

    First, the speed adjustment

 

    When this method is used to regulate the flow rate, the required power can be reduced to a minimum, and an overheating in the flow regulation process can be eliminated. Steam turbines and internal combustion engines easily adapt to speed regulation at very little additional cost. A variety of mechanical, magnetic, hydraulic transmission and DC and AC variable speed motors can be used to adjust the speed. In general, variable speed motors are too expensive and can only be adjusted with adjustable blades only after economic studies have been done for special cases.

 

    Second, bypass regulation

 

    All or part of the flow may be diverted from the discharge line of the pipeline pump through the bypass line to the suction port of the pump or other appropriate point. The bypass can be equipped with one or more flow orifice plates and a suitable control valve. Metering bypass is usually used to reduce the boiler feed pump flow, mainly to prevent overheating. Substantial power savings can be achieved by bypassing the surplus flow of the propeller pump to replace the outlet throttling.

 

    Third, exports throttle

 

    This is one of the most common and inexpensive flow adjustment methods for low- and medium-specific speed pumps. Usually this method is also limited to low, medium speed than the number of pumps used. Partially closing any type of valve on the outlet line will increase the system head so that the system head curve will intersect the pipe pump head curve at a lower flow rate. The outlet throttling moves the operating point to a lower efficiency point and has a power loss at the throttle valve. This may be important for large-scale pump installations, and a higher investment adjustment method may be more economically attractive. Throttle to the dead point may cause fluid overheating in the pump, bypass can be used to maintain the necessary minimum flow, or a different adjustment means. This is very important for the pumps mentioned above for the treatment of hot or volatile liquids.

 

    Fourth, the intake throttling

 

    If there is sufficient NPSH available, then the suction line can be throttled by saving some power. Because the throttling of the outlet can cause the liquid to overheat or vaporize, the jet fuel pump often uses inlet throttling. At very low flow, the impeller of these pumps is only partially filled with liquid, so the input power and temperature rise is about throttle exhaust throttle full operation bit 1/30 condensate pump flow is usually used to control the depth of submergence 7, This is equivalent to the entrance throttling. Special designs can reduce the cavitation damage of these pumps to a negligible extent, but the energy levels also become quite low.

 

    Fifth, qi

 

    Air intake to the suction line of the pump is also a method of regulating the flow rate, this method can save some power compared with the output throttle. In general, it is not desirable to have air present in the delivered liquid and too much air always has the risk of the pump losing its priming head, so this method is rarely used in practice except in a few cases.

 

    If you want to buy pipeline pump can contact us  Weihu pump, our company is specialized in various types of pump manufacturing and computer control of water supply and drainage complete sets of equipment manufacturers to operate the pump-based products related to general motors, pumps and other related accessories.

Sewage pump should be how to go with the cable wires

When we use the sewage pump, sewage pump should be how to layout, also we need to pay attention to how to match the cable, the following is by Shanghai mine sewage pump manufacturer is simple to share with everyone, can be a reference for everyone.

First let's talk about sewage pump cable: when the installation of various types, will have the power and sewage pump machine distance is too long, need above the basis of the sewage pump accessory cable extension cable, so the size of all kinds of sewage pump power cable are decided according to the length of the cable.

Let's go ahead with sewage pump should be how to match the cable

First, to select the wiring sewage pump first according to the size of the cable to determine the length of the wiring, such as original pump configuration cable is 3 x10 cable with 100 square meters at this time should increase cable configuration 3 x16 square is appropriate. If use sewage pump itself power supply voltage is slightly lower than the voltage required sewage pump, and add the required length of cable configuration and longer, the operation of the sewage pump cable becomes larger, if the sewage pump working long hours for sewage pump motor is very bad, this kind of sewage pump under the condition of cable wiring should match YCW type or YC type rubber set soft cable, such as not cable advice to choose YCW dived into the water.

Second, if it is diving sewage pump have to according to the sewage pump conveying liquid medium to choose to match the line, such as transmission fluid is corrosive, so the outside of the cable rubber parts to choose stainless steel submersible pumps and corrosion submersible cable, or it will because the submersible cable corrosion and leakage of dangerous accidents.

Pipeline centrifugal pump in the use course of attention which points

When we use the pipeline centrifugal pump, how should we do it? Also need to pay attention to what the problem? The following by the weihu pump to share with you in the pipeline pump process we need to pay attention to those issues:

    First, pipeline centrifugal pump in the course of operation, the bearing temperature can not exceed the ambient temperature 3 ℃, high temperature shall not exceed 80 ℃.

    Second, unscrew the pipeline pump body of the water plug, irrigation diversion (or cited pulp).

    Third, start the pipeline centrifugal pump motor, when the normal operation of the pipeline pump, open the outlet pressure gauge and import vacuum pump, depending on the display of appropriate pressure, and gradually open the gate valve, and check the motor load.

    Fourth, to the pipeline centrifugal pump bearing body lubricating oil by adding bearings to observe the oil level should be at the center of the oil standard, the oil should be replaced or added.

    Fifth, close the centrifugal pump and pipeline centrifugal pump outlet pipe valve and outlet pressure gauge and import vacuum table. Jog the pipeline pump motor, see whether the motor steering is correct.

    Sixth, try to control the pipeline pump flow and head in the range indicated on the plate to ensure that the pipeline pump in the highest efficiency point of operation in order to obtain the greatest energy saving effect.

     Seventh, if there is abnormal sound pipe pump should immediately stop to check the cause.

    Eighth, the pipeline pump and pipeline from the main pump to stop using, first close the gate valve, pressure gauge, and then stop the motor.

    Ninth, check the pipeline pump and pipe and the junction with or without loosening. Turn the pipe pump by hand to see if the piping pump is flexible.

    Tenth, regularly check the pipeline pump sleeve wear, wear should be replaced after a large.

    Twelfth, pipeline centrifugal pump used in the winter season, after parking, the need to pump the lower part of the water plug screw open the media release the net to prevent cracking.

    Thirteenth, the pipeline pump long-term outage, need to open all the pipeline pump, dry water, the rotating parts and joints coated with grease installed, and properly preserved.

    Fourteenth, the pipeline pump in the first month of work, after 100 hours to replace the oil, after each 500 hours, oil change time.

Vertical pipeline pump use

ISG type pipeline centrifugal pump for conveying water and other physical and chemical properties similar to the use of water for industrial and urban water supply and drainage, high-rise building pressurized water, garden irrigation, fire booster and equipment, the use of temperature T: ≤80 ° C.

IRG (GRG) type hot water (high temperature) circulation pump is widely used in energy, metallurgy, chemical, textile, paper, hotel and other high-temperature hot water pressurized circulation and urban heating system circulation pump, IRG temperature T: ≤120 ° C, GRG Operating temperature T: ≤240 ° C.

IHG pipeline chemical pump for the transportation of non-solid particles, corrosive, viscosity similar to the liquid of water for petroleum, chemical, metallurgy, power, paper, food, pharmaceutical and synthetic fiber and other departments, the use of temperature T: 20 ° C to 120 ° C.

YG pipeline oil pump for the transportation of gasoline, diesel, kerosene and other petroleum products, the use of temperature T: -20 ° C-120 ° C.

Pipeline pump installation method

1, the equipment shaft radial runout should be ≤ 0.04 mm, the axial movement is not allowed to more than 0.1 mm;

2, the sealing parts of the device should be installed to keep clean, sealed parts should be cleaned, sealed face intact, to prevent impurities and dust into the sealing area;

3, in the installation process is strictly prohibited bumps, beating, so as not to pay the mechanical seal friction failure and seal failure;

4, when installed in contact with the sealing surface should be coated with a layer of clean mechanical oil, so that can be successfully installed;

5, the installation static ring gland, tighten the screws must be uniform force to ensure that the static ring face and the axis of the vertical line requirements;

6, after installation to promote moving ring by hand, can move the ring on the axis of flexible movement, and a certain flexibility;

7, after the installation of hand drive shaft, the shaft should be no light and heavy feeling;

8, the device must be filled with media before operation to prevent dry friction seal failure;

Analysis of Pipeline Pump Parts

1, the motor: the electrical energy into mechanical energy of the main components.

2, pump seat: the pump is the main body, play a role in supporting the fixed.

3, the impeller: the core part of the centrifugal pump, it is high speed, great output, the impeller blade plays a major role in the impeller assembly through static balance before the experiment. The inner and outer surfaces of the impeller are required to be smooth to reduce the friction loss of the water flow.

Classification of Impellers

Open impeller: for conveying the material containing a large number of suspended solids, the efficiency is low, the liquid pressure is not high.

Semi-closed impeller: suitable for conveying easy to precipitate or contain solid particles, fibers and other particles of suspended particles, the efficiency is low.

Closed impeller: suitable for conveying clean liquid without impurities, high efficiency.

4, the pump shaft: motor connected, it is the transmission of mechanical energy of the main components.

5, mechanical seal: to keep the slide and the formation of the relative slip to prevent leakage of the device.

Main point of use of pipeline pump

1, the test work: Check whether the loose connections; hand-drive coupling to make the rotor a few turns, to see whether the unit is flexible rotation, whether the sound and the severity of uneven feel to determine whether the pump foreign body or shaft Bending, sealing the installation is not correct, etc .; check the sealing cavity of the cleaning oil on the 20th whether the filling 1/2 cavity space; pump unit surface is clean; unit turned to no-load test.

2, manual start: Pump (first), slightly open the outlet valve, start the motor, the pressure rise and confirm the smooth operation of the pump group gradually open outlet valve to the working condition requirements.

3, operation check: pipeline pump in the normal operation of the frequency, should regularly check and record the pump group ammeter, voltmeter, import and export vacuum gauge, pressure gauges and flow meters and other instrument readings, unit vibration, noise, temperature Is normal, the shaft seal should not have obvious fuel oil leakage.

4, normal parking: Close the discharge valve, the pump light load, stop the motor.

Emergency stop status:

⑴ pump motor operating ammeter indicates abnormal (too large or become very small); pump system is not the normal sound.

⑵ vacuum pump inlet pressure gauge, outlet pressure gauge indicates abnormal pump vibration and issued a different sound, a serious decline in performance.

⑶ pump motor odor, shaft seal leakage at the aviation fuel, bearing temperature more than 75 degrees and so on.

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.