Pressure control valve for controlling opening degree of valve core through utilization of sensing element and refrigeration system

Abstract

The invention relates to a pressure control valve for controlling the opening degree of a valve core through utilization of a sensing element and a refrigeration system. The pressure control valve comprises a valve body, a Bourdon tube and a conversion part; the conversion part comprises a connecting bar transmission mechanism, a gear transmission mechanism and a thread transmission mechanism; the Bourdon tube and the conversion part convert the pressure change into the corresponding motion of the valve core so as to realize the control of the opening degree of a valve port; the valve body and a cover body form a cavity for sealing the Bourdon tube and the conversion part so as to enhance the safety of the control valve; and a damping hole between an inner cavity of the Bourdon tube and an inlet of the valve body ensures the stability of the operation of the control valve. The disclosed refrigeration system comprises a compressor, a gas cooler, an inner heat exchanger, an evaporator, a gas-liquid separator and the disclosed pressure control valve. The provided pressure control valve is suitable for controlling the pressure of a high-pressure refrigeration working substance, in particular the pressure of the refrigeration working substance in a supercritical carbon dioxide refrigerating circulation system.

Description

technical field [0001] The invention relates to a pressure control valve and a refrigeration system, in particular to a pressure control valve and a refrigeration system which use a sensitive element to control the opening of a valve core. Background technique [0002] With the development of technology, high-pressure working fluid devices are more and more widely used. For example, in the refrigeration system, carbon dioxide, which is widely regarded as a promising refrigerant, is beneficial to environmental protection as a natural refrigerant. , and the performance of the transcritical carbon dioxide refrigeration cycle is also comparable to that of the traditional Freon refrigerant cycle system. However, the high and low pressure control characteristics of the transcritical carbon dioxide refrigeration system are quite different from those of the traditional compression refrigeration system. The refrigerant on the high pressure side is not condensed, but the supercritical...

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Problems solved by technology

[0004] Although this kind of pressure control device can realize the pressure control of high-pressure fluid, due to its complicated structure and cumbersome manufacturing process, it is difficult to guarantee the quality and the adjustment accuracy is not high; There are many weldings between the transmission rod and the fixed part of the bellows, and various parts of the valve body. During the operation of the high-pressure system, under the action of high-pressure fluid, it is easy to cause leakage of the bellows or the welding area, resulting in safety accidents; the adjustment sensitivity of the bellows is too high. Frequent adjustments cannot meet the needs of stable pressure control operations

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