Anti-cavitation centrifugal pump

Abstract

The invention discloses an anti-cavitation centrifugal pump comprising a pump shell, an impeller and an injecting device, wherein the pump shell is provided with a pump inlet and a pump outlet; the impeller comprises an impeller inlet and an impeller outlet; the injecting device comprises an injecting pipe and a spray nozzle, wherein a liquid inlet of the injecting pipe is communicated with an outlet of the impeller; and the spray nozzle just faces to a low-pressure area of the impeller inlet and is communicated with a liquid outlet of the injecting pipe. In the invention, a small amount of high-pressure water is led back to the impeller inlet, and injected the high-pressure water just facing to the low-pressure area of the impeller inlet through the spray nozzle, the pressure of a high-pressure area and the low-pressure area is enhanced by utilizing smaller fluid amount, the pressure intensity of the low-pressure area of the impeller inlet of the centrifugal pump is effectively increased and the centrifugal pump is prevented from generating cavitation, thereby the vibration and the noise and property reduction of the centrifugal pump and the damage of flow passage components, caused by the cavitation, can be avoided; the invention has small utilization amount of high-pressure liquid by pointedly injecting high-pressure and high-flow liquid and rarely influences the liquid striking amount and the efficiency of the centrifugal pump, thereby ensuring that the centrifugal pump can normally operate; and in addition, the invention has the advantage of using and maintaining cost saving.

Description

technical field [0001] The invention relates to a liquid conveying power equipment, in particular to a centrifugal pump. Background technique [0002] Centrifugal pumps are widely used in the fields of chemical industry, energy, domestic or industrial water supply and drainage due to low requirements on fluid properties and installation accuracy, especially in occasions with large flow requirements, and have an irreplaceable role. [0003] The centrifugal pump throws the liquid out through the action of centrifugal force. When the impeller rotates rapidly, the blades make the water rotate quickly, and the rotating water flies away from the impeller under the action of centrifugal force. After the water in the pump is thrown out, the impeller The central part of the pump forms a vacuum area, and the liquid is pressed into the water inlet pipe through the pipe network under the action of atmospheric pressure (or water pressure), forming a cycle to achieve the purpose of contin...

AI Technical Summary

Problems solved by technology

Cavitation will cause the centrifugal pump to generate vibration and noise, reduce the performance of the pump, and significantly reduce the flow rate, head and efficiency of the pump; damage the flow-through parts near the impeller outlet and the inlet of the discharge chamber; Perforation, even impeller rupture, causing serious accidents

[0004] In the prior art, there are many methods and structures for preventing cavitation in centrifugal pumps, such as reducing the suction height, adopting double-suction impellers and adopting inducer structures, but all of them need to change the existing structure, and the manufacture and installation are more complicated; the use of backflow Increasing the inlet pressure is also one of the methods used in practice, but after the high-pressure liquid is introduced into the inlet, it mixes with the inlet fluid, resulting in a decrease in the pump's pumping volume and low efficiency

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