Pressure regulating valve and refrigeration system comprising same

Abstract

The invention discloses a pressure regulating valve. The pressure regulating valve comprises a valve body and a valve core, wherein the valve core can move relative to the axial direction of the valve body; one end of the valve core is matched with a valve port so as to control the opening or closing of an inlet and an outlet of the valve body; the other end of the valve core abuts against the surface of one side of a membrane which is fixedly arranged on the valve body to form the opening setting pressure of the valve core through the membrane; the valve body which is arranged on the other side of the membrane comprises a closed accommodating chamber; a compressed fluid medium is injected into the closed accommodating chamber and the opening setting pressure is established through the compressed fluid medium. According to the pressure regulating valve, the good stability and reliability of the pressure regulation can be obtained through structural optimization and the manufacturing cost of the pressure regulating valve can be reduced. The invention also provides a refrigeration system on the basis of the pressure regulating valve, wherein the pressure regulating valve is applied to the refrigeration system.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to a pressure regulating valve for controlling the flow direction of gas or liquid and a refrigeration system with the regulating valve. Background technique [0002] At present, pressure regulating valves are mainly used in freezing, refrigerating and frequency conversion multi-unit units to play the role of overload protection. Such as figure 1 As shown, it is installed in parallel with the compressor. When the pressure on the outlet side of the compressor rises to the set development pressure of the pressure regulating valve, the regulating valve opens to connect the discharge side of the compressor with the suction side of the compressor. The discharge pressure of the compressor is reduced. For details, please refer to figure 2 . In this way, the compressor can be effectively protected to work within the reliable working load range, and the compressor will not be frequ...

AI Technical Summary

Problems solved by technology

However, limited by its own structural principle, on the one hand, the spring has a certain fatigue life, and at the same time, the spring force has a certain attenuation process after long-term use, which leads to the instability of its regulating pressure.

It can be found that when the spring force is weakened, the adjusted valve opening pressure will drop, that is, when the valve opening pressure threshold required by the system is not reached, the pressure regulating valve will open, causing abnormal opening under the normal pressure of the system. The action of the valve directly affects the efficiency and reliability of the system

In addition, the pressure regulating valve uses more parts to realize the regulating function, and the cost is relatively high

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