Thermostatic expansion valve with unidirectional control function

Abstract

The invention discloses a thermostatic expansion valve with a unidirectional control function. The thermostatic expansion valve with the unidirectional control function comprises a valve body, a first cavity, a second cavity, a first valve opening and a first valve element, wherein the valve body is further provided with a secondary valve cavity with a second valve opening and a bypass passage enabling the secondary valve cavity and the first cavity to communicate; a second valve element used for opening or closing the second valve opening and a guide part used for guiding the second valve element are arranged in the secondary valve cavity; the guide part is fixedly connected with the valve body and seals one end of the secondary valve cavity; the guide part comprises a main body portion and a guide portion extending towards the end surface portion of the second valve opening relative to the main body portion; and the second valve element is arranged in a guide space defined by the main body part and the guide part. According to the thermostatic expansion valve with the unidirectional control function, the guide part is fixedly connected with the valve body, the second valve element is wholly arranged in the guide space of the guide part, the risk of blockage of the second valve element is avoided, and work reliability is high.

Description

technical field [0001] The invention belongs to the technical field of fluid control, in particular to a thermal expansion valve. Background technique [0002] The heat pump system can cool in summer and heat in winter, which is achieved by switching the direction of the refrigerant flow through the reversing of the four-way reversing valve. Initially, in order to prevent the thermal expansion valve from cutting off the refrigeration circuit, a check valve was installed in the system piping in parallel with the thermal expansion valve. Later, through continuous improvement, the check valve was designed inside the thermal expansion valve body, which not only reduced the leakage point, but also reduced the cost. [0003] At present, the main technical scheme of adding a check valve in the thermal expansion valve body in the existing market is: install and design a bypass channel on the side parallel to the valve port, and a steel ball or a sealing block is built in the channe...

AI Technical Summary

Problems solved by technology

[0008] The disadvantages of the thermal expansion valve in the prior art are: 1. The sealing part of the one-way valve core and the guide rod are integrally processed. In order to ensure the low leakage rate of the valve in the cooling state, the processing difficulty of the one-way valve core is relatively Large; 2. The guide rod on the one-way valve core cooperates with the guide groove on the valve body to play a guiding role. The guiding length varies with the movement of the one-way valve core.

When the system is switched from the heating state to the cooling state, there is a hidden danger of the guide rod being stuck due to too short matching length

In order to ensure the cooperation between the guide rod and the guide groove when the one-way valve core and the cover abut, it is necessary to increase the volume of the valve body; 3. The setting of the guide groove makes the processing technology of the valve body complicated

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