Self-circulation cavitation-preventing machine box suitable for centrifugal/mixed-flow type water pump

Abstract

A self-circulation cavitation-preventing machine box suitable for a centrifugal / mixed-flow type water pump is characterized in that a backflow channel which guides high-pressure fluid on the rear portion of a water pump impeller into an inlet of the water pump is formed in the machine box so that the pressure intensity of the inlet of the water pump can be increased, and the pressure intensity ofthe fluid in the inlet of the water pump can be higher than the corresponding vaporization pressure to prevent vaporization from happening. An inlet of the backflow channel is formed in the rear portion of the water pump impeller, and an outlet of the backflow channel is formed in the inlet of the water pump. A temperature and pressure sensor is installed in the inlet of the water pump and used for detecting the pressure and the temperature of the fluid in the inlet to determine whether the pressure is equal to the saturated vapor pressure corresponding to the current water temperature or not.A valve is arranged in the backflow channel. According to the self-circulation cavitation-preventing machine box suitable for the centrifugal / mixed-flow type water pump, a backflow device is used, the high-pressure fluid on the rear portion of the impeller is jetted to the inlet of the water pump again through the backflow device, the pressure of the inlet of the water pump is improved, the phenomenon that the pressure of the fluid is equal to the vaporization pressure is avoided, the generation of vapor bubbles is avoided, and the influence of cavitation is fundamentally avoided.

Description

technical field [0001] The invention relates to the technical field of water pump anti-cavitation self-circulation casing, and specifically designs a self-circulation anti-cavitation casing device suitable for centrifugal / mixed flow water pumps. Background technique [0002] Centrifugal water pump is a pump that uses the centrifugal force generated by the rotating impeller to transport liquid. Centrifugal pump is an important pump product in fluid machinery. It has the advantages of high performance adaptability, small size, single structure, long life, convenient and reliable operation and low maintenance cost. . The mixed flow pump is also called the diagonal flow pump. It is a water pump whose performance and structure are between the centrifugal pump and the axial flow pump. It is widely used in industry. [0003] The occurrence of cavitation in a pump has many detrimental effects on the pump. When cavitation occurs, due to the joint action of mechanical erosion and c...

AI Technical Summary

Problems solved by technology

When cavitation occurs, due to the joint action of mechanical erosion and chemical corrosion, the material will be damaged; cavitation will not only damage the material, but also vibration and noise, bubble burst and high-speed impact will cause serious noise; The existence of bubbles will block the cross-section of the flow channel, reduce the energy obtained by the fluid from the impeller, lead to a decrease in head, and a corresponding decrease in efficiency, which will cause a significant change in the performance curve of the pump

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