Pump body assembly, heat exchange equipment, fluid machine and operation method of fluid machine

Abstract

The invention provides a pump body assembly, heat exchange equipment, a fluid machine and an operation method of the fluid machine. The pump body assembly comprises a piston, a rotating shaft, a piston sleeve and an air cylinder; the rotating shaft performs reciprocating motion in the piston sleeve while driving the piston to rotate; the piston sleeve are located in the air cylinder; a compressioncavity is formed between the outer circumferential wall of the piston and the inner wall of the air cylinder; a pressure relief concave part is arranged on the outer circumferential wall of the piston or the inner wall of the air cylinder; and the pressure relief concave part corresponds to the compression cavity. With the pump body assembly of the invention adopted, over-compression occurring during the air exhausting of a pump body assembly in the prior art is alleviated.

Description

technical field [0001] The invention relates to the field of heat exchange systems, in particular to a pump body assembly, heat exchange equipment, fluid machinery and an operation method thereof. Background technique [0002] Chinese patent CN109595157A discloses the pump body structure of the rotary cylinder piston compressor and the rotary cylinder piston compressor. Its working principle is that the rotating shaft drives the piston to rotate, and the piston drives the piston sleeve to rotate in the cylinder. However, the piston only has relative reciprocating motion relative to the rotating shaft and the piston sleeve, and the two reciprocating motions are perpendicular to each other. During this process, suction, compression and exhaust are realized. During the process of suction, compression and exhaust, the radial distance between the piston and the inner diameter of the cylinder changes periodically. In the process of air intake, the radial distance between the pis...

AI Technical Summary

Problems solved by technology

The exhaust channel area is the product of the distance between the extrusion end surface and the radial direction of the cylinder and the cross-sectional height. During the exhaust process, the high-pressure gas outside the exhaust port first flows through the space between the piston extrusion end surface and the cylinder, and then However, as the distance between the piston extrusion end surface and the radial direction of the cylinder decreases, the exhaust area is much smaller than the exhaust port area. As the distance decreases, the effective exhaust area also continues. Reduced, resulting in large exhaust resistance, increased exhaust pressure, higher than the design exhaust pressure, the entire compression chamber appears overcompression, affecting the energy efficiency of the compressor

[0003] In view of this, the Chinese patent CN107387410A discloses a technical solution for pressure relief. By opening a pressure relief channel on the cylinder, the problem of overcompression is alleviated to a certain extent. The channel can only improve the overcompression problem near the pressure relief channel, and the overcompression phenomenon still exists in the position far away from the pressure relief channel and exhaust channel

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