Purpose of centrifugal pump casing wear ring and impeller wear ring
Wear rings can be defined as a device used to seal the pressure leakage of the liquid between the inlet of the impeller and the pump casing. Wear rings are typically found on pumps with closed impellers. A similar device that serves the same function called a wear plate can be found on some pumps with a semi-open impeller.
The typical reason for using a wear ring is to decrease the amount of leakage loss around the impeller. Due to more work available to push the pumped liquid out the discharge there is a slight improvement in pump efficiency.
And also as name indicates 'WEAR' which is a ring can sacrifice its size by taking friction generated between stationary and rotating elements. The replacement of rings is easier & cheaper than replacing impellers/casing.
Wear rings are sacrificial components installed on the casing and impeller to inhibit fluid from recirculating back to suction from the discharge. They provide a renewable restriction between a closed impeller and the casing. Wear rings are often installed on both the front and back of the impeller. When wear rings are installed on the back of the impeller, another set of rings is installed in the back cover.
Wear rings act as the seal between the casing and the impeller.
Pump manufacturers know that decreasing wear ring clearance leads to improved efficiency.
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