How to balance the axial thrust of the pump

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Balance hole opened can not be too large, mainly affect the efficiency of the pump, here are several ways to pump axial thrust balance.
For single-stage pump shaft to the balance of forces generally have the following forms: ball bearing suppliers
1, the opening balance hole
Drilling several holes in the rear cover of the pump close to the hub, and to increase a seal in the rear panel, the outer diameter of the sealing ring and the impeller is equal to the outer diameter of the suction port. The pump is operated, the liquid inside the rear cover seals communicating with the suction port, the pressure and suction pressure similar. Seals exterior rear cover area and the suction area of ​​the front cover extraoral equal, thus dispatched the pressure of the liquid in the former, the rear cover panel of the total force substantially equal, the small part is not balanced by the axial force from the bearing to withstand. Under normal circumstances, the better open the balance Kong Pingheng axial force. Its characteristics are: leak more, but also interfere with the normal flow of the impeller inlet liquid balance hole liquid, the centrifugal pump efficiency is reduced by about 2-5%, applies only to a small, single-stage centrifugal pump.
2, using the balance tube
This method is substantially the same and the method of opening balance hole is provided in the rear cover plate of the impeller and corresponding to the suction port at the orifice ring, the liquid is introduced in the use of this within the sealed space of the counterbalance tube to the pump inlet, so that this part of the hydraulic inlet pressure balance, so that the axial force balance, this device requires a balance tube overcurrent basal area should be equal to or greater than 4-5 times the mouth ring gap flow area. NTN bearig
3, using the balance leaves
Symmetrical placement of the back surface of the cover plate of the impeller after the several radial ribs sheet, when the rotation of the impeller, tendons sheet match pump vanes accelerate the rotation of the liquid on the b ack of the blade, the centrifugal force increases, so that the pressure on the back of the blade significantly decreased, so that the impeller both sides of the pressure reaches a balance, its equilibrium level depends on the size of the blade and vane balanced with the pump gap. The disadvantage is that the pump efficiency is reduced.
4, double suction impeller
Sided inlet on the larger flow of single-stage centrifugal pump or a small number of multi-stage centrifugal pump impeller, the axial thrust balance by its own working conditions, but it is actually difficult for manufacturers to do the pump two Ceguo the geometric shape of the flow components is completely consistent, so there will be a smaller axial force acting on the rotor, therefore, rely on the pump shaft at one end of the single row to the heart of the ball bearing to bear.
In addition, the multi-stage pump shaft balancing device can be used impeller symmetrically arranged in the form of bala nce hub axial force balance and balance disc balance the axial force.