What Is The Function Of The Leakage Reducing Ring Of Centrifugal Pump

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What is the function of the leakage reducing ring of centrifugal pump

2021/09/17

What is the function of the leakage reducing ring of the centrifugal pump? There is a rotating gap at the joint between the outer edge of the suction inlet of the centrifugal pump impeller and the inner wall of the pump shell, and there is a high and low pressure area on both sides of the gap. If the clearance is too large, the high-pressure water in the pump housing will leak into the low-pressure area at the entrance of the impeller through the clearance, thus reducing the flow rate and efficiency of the pump. However, when the impeller rotates, it will friction with the inner wall of the pump shell, resulting in mechanical wear. Generally speaking, two leakage reduction methods are adopted in the structure of the pump:

1. Reduce the transition gap (0.1-0.5mm).

2. Increase the resistance in the leakage channel. However, due to the problems of machining, installation and axial error, the wear between impeller and pump shell is easy to occur. In order to reduce backflow and prolong the service life of the pump shell and impeller, a metal orifice ring is usually embedded on the pump housing or impeller on both sides of the clearance. The contact surface of this mouth ring can be made into a multi-tooth shape, which is used to increase the reflux resistance, reduce the reflux, and improve the effect of reducing reflux, so it is called the mouth ring. This ring is used to withstand wear and tear. Therefore, the service life of the pump housing or impeller can usually be replaced.

Because of the unilateral water intake, the single suction centrifugal pump impeller has only one leakage reducing ring, and the double suction centrifugal pump impeller enters water on both sides. So there are two leak reducing rings. For the is centrifugal pump with large diameter and high head, especially the pipeline centrifugal pump with the balance hole in the back cover of the impeller, there is a leakage reducing ring between the rear wheel disk and the pump shell; for the multi-stage pump, there is a leakage reducing ring at the front and rear of each impeller in order to reduce the leakage of water.