Thermal expansion valve and assembling method

Abstract

The invention discloses a thermal expansion valve and an assembling method thereof. The thermal expansion valve comprises a valve body, a gas box head, a valve core component and an adjusting component, wherein the adjusting component comprises an adjusting rod, a spring seat, a valve core support base and an adjusting spring; the valve body comprises a mounting cavity and an adjusting cavity which are respectively arranged at the upside and the downside and are communicated with each other; the mounting cavity is used for mounting the adjusting component in the adjusting cavity through an upper opening of the valve body; the adjusting rod comprises a matching part and an adjusting part respectively located at the upper part and the lower part, and a positioning circular bead located between the matching part and the adjusting part; the matching part is matched with the spring seat; the adjusting part is used for a user to operate; the adjusting rod is located in the adjusting cavity through the positioning circular bead; a third sealing pair is formed between the adjusting part of the adjusting rod and the adjusting cavity; the spring seat is matched with the inner wall of the adjusting cavity through a screw thread, so that the spring seat can move up and down under the driving of the adjusting rod. As the adjusting component is arranged in the adjusting cavity from the upper opening of the valve body, the installation problem of the adjusting component is solved without setting an adjusting seat in the prior art; and furthermore, the leakage risk is reduced, and the whole performances of the products are improved.

Description

technical field [0001] The invention relates to the technical field of refrigerant fluid control components, in particular to a thermal expansion valve and an installation method thereof. Background technique [0002] The thermal expansion valve is an important part of the refrigeration system, and together with the evaporator, compressor and condenser constitute the four basic components of the refrigeration system. 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] figure 1 Shown is a structure of an existing thermal expansion valve, which includes a valve body 29, an air box head connected to the upper end of the valve body 29, and a valve cap 21 threaded with the lower end of the val...

AI Technical Summary

Problems solved by technology

The thermal expansion valve of this structure also brings the following adverse effects due to the addition of the adjustment seat and the spring seat: the sealing structure between the adjustment seat and the valve body ( figure 2 The shown thermal expansion valve adopts knife-shaped seal) there is a hidden danger of leakage; the regulating seat and the valve body are designed separately, and there are many parts, which increases the management cost and assembly process

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