Backwater hole anti-clogging centrifugal self-priming sewage pump

Abstract

A water return hole anti-blocking centrifugal self-suction sewage pump is composed of a pump body, an impeller 2, a pump shaft, a suspension and a suction one-way valve. An inner cavity of the pump body is provided with a suction inlet, a suction channel, an exhaust opening, a gas-water separation chamber and a water return hole. A filter device is arranged right ahead the water return hole and is composed of a support and a rotating sleeve mounted in an inner cavity of the support. A filter screen is mounted on the outer circle of the rotating sleeve and is made of a stainless steel sheath. A medium is filtered to then enter the water return hole, and blocking of the water return hole is avoided. A scraper plate is further mounted on the support. When the rotating sleeve is driven by a handle to rotate, impurities accumulated on the filter screen are scraped by the scraper plate to fall into a settling pond, and therefore the impurities accumulated on the filter screen can be removed without shutdown. If the content of impurities in sewage is too high, the extending end of the rotating sleeve can be driven by a worm reduction gear to rotate, and the filter screen can be cleaned without a break. Sediment of the settling pond can be cleared away through a slag outlet at a fixed period.

Description

technical field [0001] The invention relates to a centrifugal pump, in particular to an anti-clogging centrifugal self-priming sewage pump for a return hole. Background technique [0002] In the well-known common centrifugal pump, if the suction liquid level is below the impeller, it should be pre-filled with water when starting, which is very inconvenient. In order to store water in the pump, the inlet of the suction pipe needs to be equipped with a bottom valve. When the pump is working, the bottom valve will cause a large hydraulic loss. The so-called self-priming pump does not need to be filled with water before starting (it still needs to be filled with water for the first start after installation). After a short period of operation, the pump itself can suck up the water and put it into normal operation. [0003] Due to the special structure of the pump body of the gas-liquid hybrid self-priming pump, after the pump stops, there is a certain amount of water in the pump...

AI Technical Summary

Problems solved by technology

[0005] As we all know, the self-priming effect of the self-priming centrifugal pump is realized through the backwater hole. After the self-priming centrifugal pump is applied to sewage, it is possible that the area of ​​the backwater hole will become smaller or even blocked due to the retention of impurities. Lost self-priming function

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