Drainage pressure reduction device for centrifugal pump

Abstract

The invention discloses a drainage pressure reduction device for a centrifugal pump. When pressure reduction work is conducted on the centrifugal pump, drainage pressure reduction can be well conducted on the centrifugal pump through the drainage pressure reduction device. Drainage work is conducted according to the actual internal pressure condition of a pump body, and then normal work of the centrifugal pump is guaranteed. Through the arrangement of drainage bodies, pressure limiting springs and pressure reduction staged drainage mechanisms, staged drainage pressure reduction can be conducted on the centrifugal pump. When the internal pressure of the centrifugal pump body is too large, multi-stage drainage can be conducted according to the actual situation of the centrifugal pump body, and then the working efficiency of pressure reduction of the centrifugal pump body can be improved. The internal pressure of the pump body can be quickly recovered to be within a pressure safety use limit value, normal operation of the centrifugal pump is guaranteed, the working efficiency is guaranteed, damage to the centrifugal pump is avoided, and the working economic benefit is guaranteed.

Description

technical field [0001] The invention relates to the technical field of centrifugal pump devices, in particular to a centrifugal pump discharge pressure reducing device. Background technique [0002] Centrifugal water pump is referred to as "centrifugal pump"; it is a pumping machine that uses the centrifugal motion of water; it is composed of pump casing, impeller, pump shaft, pump frame, etc.; the pump should be filled with water before starting, and the rotating The impeller drives the water in the pump to rotate at a high speed, and the water moves centrifugally, and is thrown out and pressed into the outlet pipe; after the water is thrown out, the pressure near the impeller decreases, forming a low-pressure area near the rotating shaft; the pressure ratio here is Atmospheric pressure is much lower, and the outside water is under the action of atmospheric pressure, flushes the bottom valve and enters the pump from the inlet pipe; the flushed water is thrown out again duri...

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Problems solved by technology

[0003] For the water pump in the working process, when the water body pressure in the pump body exceeds the safe use limit value of the pump body, it needs to be controlled for decompression. On the one hand, the decompression measures for the pump body in the prior art have low decompression efficiency and are not effective. The pressure in the pump body can be decompressed in time. On the other hand, the discharge and decompression of the pump body cannot be decompressed in stages according to the actual pressure of the pump body. When the pressure of the pump body far exceeds the safe use limit value, the existing technology The decompression device requires a long time of decompression work to restore the pressure of the pump body to within the safe use limit, which will affect the work efficiency, and may cause damage to the pump body, and then it cannot be used normally. Therefore, the present invention proposes a Centrifugal pump discharge pressure reducing device is used to solve the above problems

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