Thermal expansion valve

Abstract

The invention discloses a thermal expansion valve with a unidirectional control function. The thermal expansion valve comprises a valve (1), a temperature sensing assembly (2) and a first valve element assembly (4). The valve (1) is provided with an inlet channel (11) and an outlet channel (12), the temperature sensing assembly (2) is arranged at one end of the valve (1), the first valve element assembly (4) is arranged in an inner cavity of the valve (1) and comprises a valve stem (41) and a first valve element (42), the valve stem (41) is abutted to the temperature sensing assembly (2), and the first valve element (42) is matched with a first valve port (14) arranged in the inner cavity (13), so that the flow of medium fluid which flows from the inlet channel (11) to the outlet channel (12) can be controlled. The thermal expansion valve is characterized in that the valve (1) is further provided with an accommodating portion, a cover (5) is arranged in the accommodating portion, and an inner hole (16) of the cover (5) is communicated with the inlet channel (11) and the inner cavity (13) to form auxiliary fluid channels. Compared with the prior art, the thermal expansion valve with the unidirectional control function has the advantages that the cover is arranged on the valve, so that a valve machining process is simplified; a valve port and a sealed position can be machined on the cover in the preferred scheme by means of drawing at one step, and a guide portion or limiting portion can be arranged on the cover by means of stamping, so that the machining process is simple and reliable, and the thermal expansion valve is suitable for mass production.

Description

technical field [0001] The invention belongs to a refrigeration control system, in particular to a thermal expansion valve with a single control function used in an air conditioning system. Background technique [0002] Thermal expansion valves are usually used in heat pump control systems. In heat pump control systems, the refrigerant can generally flow in reverse to achieve the functions of cooling and heating. The thermal expansion valves in the prior art are generally set in one direction, and the one-way valve is set on the external bypass. to the valve. When the system flows forward, the one-way valve is closed, and the medium is throttled through the expansion valve. When the system is flowing in the reverse direction, the one-way valve is opened, and the medium flows through the one-way valve. But the separate one-way valve and bypass channel Will increase installation costs and maintenance costs, the potential for leakage will increase. [0003] Therefore, in rece...

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Problems solved by technology

[0004] Although the above-mentioned structure can integrate the expansion valve and the one-way valve provided separately into an integrated structure, the structure is complex and requires high processing technology for the valve body, while the thermal expansion valve with the one-way control function in the prior art Improve structure, simplify structure and improve reliability, is the problem to be solved in this technical field

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