Refrigerating system and thermal expansion valve thereof

Abstract

The invention discloses a thermal expansion valve comprising a valve body (1). The upper end of the valve body is provided with a gas tank, and an inner cavity of the gas tank is separated to an upper cavity (22) and a lower cavity (23) by a membrane (21). A valve port (11) matched with a valve core component (3) is formed in the inner cavity of the valve body (1), and the inner cavity of the valve body (1) is separated to a first interface cavity (12) and a second interface (13) by a sealing line (31) or a sealing face between the valve port (11) and the valve core component (3). The lower cavity (23) is communicated with a balance cavity (14) and is in isolated sealing with the first interface cavity (12) and the second interface cavity (13). With the adoption of the structural design of the thermal expansion valve, system pressure difference subjected by the valve core component (3) can be reduced so that the adjustment precision of the valve core component is improved. In addition, the invention also discloses a heat exchange device comprising the thermal expansion valve.

Description

technical field [0001] The invention relates to the technical field of refrigerant fluid control components, in particular to a thermal expansion valve. In addition, the present invention also relates to a refrigeration system comprising the thermal expansion valve. Background technique [0002] The thermal expansion valve is an important part of the refrigeration system, and it is another basic part of the four basic components of the refrigeration system except the evaporator, compressor and condenser. The main function of the thermal expansion valve is to control the opening of the valve by sensing the superheat of the outlet end of the evaporator or the suction end of the compressor in the refrigeration system, so as to achieve the purpose of regulating the flow of refrigerant in the system and throttling and reducing pressure. [0003] Please refer to figure 1 , figure 1 It is a structural schematic diagram of a typical thermal expansion valve in the prior art. [0...

AI Technical Summary

Problems solved by technology

[0012] First, the transmission rod 3′2, the valve core 3′1 and the guide ball 3′4 are set separately, and there are many parts, resulting in a large accumulation of axial dimensional tolerances, thereby reducing the adjustment accuracy and performance of the thermal expansion valve. At the same time, the assembly is also difficult kind of hard;

[0013] Second, the balance chamber 1'4 communicates with the first interface chamber 1'2. When the first interface chamber 1'2 is the high-pressure end, the pressure in the balance chamber 1'4 is high, resulting in higher sealing requirements and increasing risk of leakage;

[0014] Third, the through hole 3'11 is set on the smaller valve core 3'1, which is difficult to process

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