Pump axial force balance method

A, thrust bearings

 Of small pump axial force is not big, we often thrust ball bearing is used to balance the axial force, here special remind is, angular contact bearings has direction installation requirements, if installed backwards, not only can't afford to balance the action of axial force, and lose axis positioning and make the rotor motion, light burning motor, or a major accident, absolutely cannot treat STH lightly.

Second, the balance hole

This structure is in the impeller HouGaiBan near the wheel of righteousness axisymmetric to open several holes, making HouGaiBan high-pressure liquid to return to the impeller inlet, and reduces the pressure of the impeller back cover place, balance the effect of axial force. HouGaiBan in this structure requires impeller sealing ring, that is to say the HouGaiBan office without pump seal ring structure is adopted, when pump leak amount is larger, head losses.

This structure balance ability and the number and size of balance. Because we can't accurate calculation, so this method also can't completely balance the axial force, there are still 10% 20% of the axial force can't balance. Balance hole total cross-sectional area of the mouth of the annular ring clearance area 3 ~ 6 times.

Three, double suction impeller

Double suction impeller is symmetric structure, so to balance the axial force.

Four, back blade

Blade is back in the impeller HouGaiBan (lateral) is similar to the blades are the reinforcement (some curved like leaves, have a plenty of upright), it is like another impeller pump impeller at the back of the liquid, make HouGaiBan place liquid pressure is reduced, so as to achieve the purpose of the balance of axial force. This method's ability to balance the clearance between the impeller and the pump cover and back and the height of the blade and back the length of the blade, the clearance between the impeller and the pump cover, the greater the balance effect is poorer, the smaller the gap, balance the better the results. Design gap is too small, but because of the error of machining, assembly, it is possible to make the impeller and the pump cover produces friction or collision, impact, general design given value for the clearance of 0.5 ~ 3 mm, great pump take great value.

Five, the symmetrical arrangement of impeller

Because multistage pump impeller series, so it's bigger than axial force, sometimes when the design adopts the method of symmetrical arrangement of the impeller axial force produced by making them cancel each other out, thus achieve the goal of peace and axial force. Indeed, double suction impeller is special symmetrical arrangement of the impeller.

Six, the balancing drum and disc

The balancing drum and disc are used to balance the axial force of the multistage pump device, installed at the back of the stage at the end of the impeller. There are also install both together.