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

Aug 08, 2022

There is a rotating handover gap at the joint between the outer edge of the suction port of the impeller of the fluoroplastic centrifugal pump and the inner wall of the pump casing, and the two sides of the gap are high and low pressure areas. If the clearance is too large, the high pressure water in the pump casing will leak through the clearance to the low pressure area at the inlet of the impeller, reducing the flow and efficiency of the pump. However, when the impeller rotates, it will rub against the inner wall of the pump casing, causing mechanical wear. Generally speaking, fluoroplastic centrifugal pumps adopt two methods of reducing leakage in structure:

Reduce handover gap (0.1-0.5mm);

Increase the resistance in the leakage channel. However, due to problems such as machining, installation and axial errors, wear between the impeller and the pump casing can easily occur. In order to reduce backflow and prolong the service life of pump casing and impeller, a metal ring is usually embedded on the pump casing or impeller on both sides of the gap. The contact surface of this mouth ring can be made into a multi-tooth shape, which is used to increase the backflow resistance, reduce the backflow volume, and improve the effect of reducing backflow, so it is called this mouth ring. This mouth ring is used to withstand the worn parts. Therefore, the life of the pump casing or impeller can usually be replaced.

Due to the water inflow on one side, the impeller of a single-suction centrifugal pump has only one leakage reduction ring; the impeller of a double-suction centrifugal pump is filled with water on both sides. So there are two leakage reducing rings. For IS-type centrifugal pumps with large diameter and high lift, especially for pipeline centrifugal pumps with balance holes in the back cover of the impeller, there is also a leakage reducing ring between the rear disc and the pump casing; for multi-stage pumps, each There are leakage reducing rings on the front and rear of the impeller to reduce the leakage of water.