Refrigeration system and thermostatic expansion valve thereof

Abstract

The invention discloses a thermostatic expansion valve comprising a valve body, wherein the valve body is provided with a gas tank at the upper end, and an inner cavity of the gas tank is divided by a membrane into an upper cavity and a lower cavity; a valve core component and a valve port matched with the valve core component are arranged in the inner cavity of the valve body, and the lower end part of the valve core component is arranged in a balancing cavity of the valve body. The thermostatic expansion valve is characterized in that a sealing component is further arranged between the balancing cavity and the inner cavity of the valve body, a through hole is further arranged on the valve body, the balancing cavity and the inner cavity of the valve body are isolated and sealed by the sealing component, and the balancing cavity is communicated with the lower cavity by the through hole. According to the structure design of the thermostatic expansion, the system pressure difference applied on the valve core component is reduced so as to improve the adjusting precision of the valve core component. Furthermore, the invention further discloses a heat exchange device comprising the thermostatic 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...

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Problems solved by technology

[0007] Although, figure 1 The thermostatic expansion valve shown can achieve two-way balanced flow, but this balance is only a basic balance, and the system pressure difference is not completely zero, and complete balance has not been achieved

Specifically, as figure 1 As shown, since the connection between the transmission plate 3'3 and the transmission rod 3'2 is a gap connection, the pressure of the refrigerant in the lower chamber 2'3 acts on the upper end surface of the transmission rod 3'2, and then feeds the valve There is a downward force on the spool 3'1. The existence of this force makes the system pressure difference not completely zero, so it will still affect the adjustment accuracy of the spool 3'1.

[0008] It should be noted that, when the transmission plate 3′ 3 and the transmission rod 3′ 2 are in a sealed connection and there is no gap between the two, the transmission plate 3 ′ 3, the transmission rod 3 ′ 2 and the valve The core 3′1 is taken as the force analysis object as a whole. At this time, the top surface of the transmission piece 3′3 will still receive a downward force generated by the pressure of the refrigerant in the lower chamber 2′3. The force-bearing area of ​​the force is That is, the sealing area between the transmission rod 3'2 and the transmission plate 3'3, that is, the area of ​​the upper end surface of the transmission rod 3'2, and then the valve core 3'1 will still be subjected to a downward force. The existence of force makes the pressure difference of the system not completely zero, which will still affect the adjustment accuracy of the spool 3′1

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