How to balance the water pump bearings
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For single-stage pump shaft to the balance of forces generally have the following forms:
1 , opening balance hole
After the cover of the pump near the hub of the drill several holes , an additional sealing ring and the rear cover , the outside diameter of the sealing ring is equal to the outer diameter of the impeller suction . The pump , the liquid suction port in communication with the sealing plate , the pressure close to the suction pressure . After sealing the outer cover to the suction area of ??the front cover an area equal to the estuary , so the liquid sending pressure of the front cover panel of the total force substantially equal to a small part of the axial force is not balanced by a bearing to bear. Generally , it is preferred to open the axial force balance Kong Pingheng effect . Its characteristics are : leak more fluid balance through the hole and interferes with the normal flow impeller inlet liquid centrifugal pump efficiency is reduced so that about 2-5 % , applies only to a small single-stage centrifugal pump.
2, using a balance tube
This approach balanced with open hole is basically the same , setting the mouth ring impeller and suction cover plate corresponding place, the introduction of the use of this balance pipe liquid seal pump inlet space to make this part of the hydraulic inlet pressure balance , so that the axial force is balanced , this device requires a balance tube overcurrent off area should be equal to or greater than the flow area orifice ring gap of 4-5 times.
3 , a balanced blade
After the back cover of the impeller radial ribs symmetrically arranged several pieces , when the impeller is rotated cleats as pumping vanes on the back of the blade as the liquid to accelerate rotation, the centrifugal force increases, the vane back pressure decreased significantly , so that the impeller pressure on both sides to reach a balance , equilibrium depends on the size of the gap and balance the blade and vane pump body . The disadvantage is to reduce pump efficiency.
4 , double suction impeller
Using double-sided impeller inlet on the flow of the larger single-stage centrifugal pump or a few multi- stage centrifugal pumps , axial thrust is obtained from the balance of the working conditions of its own , but in fact very difficult to do because the manufacturers of the two pumps Ceguo flow component geometry exactly the same , so there will still be a small axial force acting on the rotor , therefore , rely on single row radial ball bearing shaft end of the bear .
In addition, the multi-stage pump shaft to balance device , the impeller can be arranged symmetrically law , balance wheel balance balance balance disc axial force and the axial force and other forms.
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Balance holes can not be too open too , mainly affecting the efficiency of the pump , the pump Here are some axial thrust balance in several ways.For single-stage pump shaft to the balance of forces generally have the following forms:
1 , opening balance hole
After the cover of the pump near the hub of the drill several holes , an additional sealing ring and the rear cover , the outside diameter of the sealing ring is equal to the outer diameter of the impeller suction . The pump , the liquid suction port in communication with the sealing plate , the pressure close to the suction pressure . After sealing the outer cover to the suction area of ??the front cover an area equal to the estuary , so the liquid sending pressure of the front cover panel of the total force substantially equal to a small part of the axial force is not balanced by a bearing to bear. Generally , it is preferred to open the axial force balance Kong Pingheng effect . Its characteristics are : leak more fluid balance through the hole and interferes with the normal flow impeller inlet liquid centrifugal pump efficiency is reduced so that about 2-5 % , applies only to a small single-stage centrifugal pump.
2, using a balance tube
This approach balanced with open hole is basically the same , setting the mouth ring impeller and suction cover plate corresponding place, the introduction of the use of this balance pipe liquid seal pump inlet space to make this part of the hydraulic inlet pressure balance , so that the axial force is balanced , this device requires a balance tube overcurrent off area should be equal to or greater than the flow area orifice ring gap of 4-5 times.
3 , a balanced blade
After the back cover of the impeller radial ribs symmetrically arranged several pieces , when the impeller is rotated cleats as pumping vanes on the back of the blade as the liquid to accelerate rotation, the centrifugal force increases, the vane back pressure decreased significantly , so that the impeller pressure on both sides to reach a balance , equilibrium depends on the size of the gap and balance the blade and vane pump body . The disadvantage is to reduce pump efficiency.
4 , double suction impeller
Using double-sided impeller inlet on the flow of the larger single-stage centrifugal pump or a few multi- stage centrifugal pumps , axial thrust is obtained from the balance of the working conditions of its own , but in fact very difficult to do because the manufacturers of the two pumps Ceguo flow component geometry exactly the same , so there will still be a small axial force acting on the rotor , therefore , rely on single row radial ball bearing shaft end of the bear .
In addition, the multi-stage pump shaft to balance device , the impeller can be arranged symmetrically law , balance wheel balance balance balance disc axial force and the axial force and other forms.
