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.