Bidirectional flow heat expansion valve

Abstract

A two-way circulating thermal expansion valve consists of a valve body and a power head component arranged on the upper end thereof. The valve body is provided with a first interface and a second interface; the inside of the valve body is provided with a valve port communicated with the first interface and the second interface and a valve core which is matched with the valve port and relatively supported by an adjustable spring and a transmission shaft at the lower side of the valve port. The invention is characterized in that the inside of the valve body is also provided with a reverse valve port communicated with the first interface and the second interface. By arranging the reverse valve port inside the valve body and possessing the functions of the ordinary expansion valve and the one-way valve, the invention decreases the installation complexity and reduces the number of potential leak points due to the large number of weld seams. With reasonable and compact structure, the invention can be matched with most fittings at present, thus having strong universality, effectively increasing the convenience and safeness of the air-conditioning system installation and reducing the cost of the air-conditioning system.

Description

technical field [0001] The invention belongs to the technical field of throttling devices, in particular to a two-way circulation thermal expansion valve which integrates a one-way valve and a thermal expansion valve. Background technique [0002] In the prior art, thermal expansion valves used in pipeline systems such as air-conditioning systems mainly include a valve body and a power head component. The valve body is provided with a first port and a second port, and the valve body is provided with a connection between the first port and the second port. The valve port is provided with a valve core supported by an adjustment spring and a transmission shaft on the lower side of the valve port, and the transmission shaft is driven by the power head part. When working, the refrigerant flows from the first interface connected to the condenser outlet to the second interface connected to the evaporator inlet, and the power head component feels the superheat at the evaporator outl...

AI Technical Summary

Problems solved by technology

[0003] The thermal expansion valve with the above structure, because the only channel between the first port and the second port is a solid valve core, can only make the refrigerant flow in one direction, that is, flow from the first port to the second port; otherwise, when flowing from the second port to When the first port is used, the valve core part will close the valve port because the pressure of the second port is greater than the pressure of the first port. Therefore, in actual use, two thermal expansion valves are usually connected in series and a check valve is connected in parallel. , so that the medium in the air-conditioning system can be throttled in two directions and work normally. Although this air-conditioning system can achieve two-way throttling, its structure is complex, the cost is high, the installation is inconvenient, and the number of welds and potential leakage points are large. , less secure

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