Bi-direction circulation expansion valve

Abstract

The invention provides a bi-direction circulation expansion valve, and belongs to the technical field of air conditioners. The bi-direction circulation expansion valve solves the problem that an existing bi-direction circulation expansion valve is poor in sealing property due to a plurality of potential leakage points which are caused by a fact that two expansion valve assemblies are connected in parallel and a valve body is fixedly connected with a protection cover in a welding mode in the existing bi-direction circulation expansion valve. The bi-direction circulation expansion valve comprises a valve body which is provided with two inlet cavities. A first bi-direction valve assembly and a second bi-direction valve assembly are placed inside the valve body, and a valve cavity of the first bi-direction valve assembly is communicated with a valve cavity of the second bi-direction valve assembly. A first one-direction valve assembly is placed between a first outlet of the first bi-direction valve assembly and an inlet cavity of the second bi-direction valve assembly, wherein the first one-direction valve assembly is used for enabling refrigerating fluid to flow in through the first outlet and flow out from the inlet cavity. A second one-direction valve assembly is placed between a first outlet of the second bi-direction valve assembly and an inlet cavity of the first bi-direction valve assembly, wherein the second one-direction valve assembly is used for enabling the refrigeration fluid to flow in through the first outlet of the second bi-direction valve assembly and flow out from the inlet cavity of the first bi-direction valve assembly. The bi-direction circulation expansion valve has the advantages of being small in number of parts, simple in structure and easy to assemble.

Description

technical field [0001] The invention belongs to the technical field of air conditioners, and relates to a mechanical automatic expansion valve for refrigeration of frequency conversion air conditioners, in particular to a two-way flow expansion valve. Background technique [0002] Expansion valves are mainly used in air conditioning and refrigeration systems and are an important part of the refrigeration system. The expansion valve makes the medium-high temperature and high-pressure liquid refrigerant turn into low-temperature and low-pressure wet steam through its throttling, and then the refrigerant absorbs heat in the evaporator to achieve the cooling effect. The expansion valve controls the flow rate of the valve through the change of superheat at the end of the evaporator to prevent Insufficient utilization of the evaporator area and knocking on the cylinder appear. Two-way expansion valves are mainly used in heating and cooling air-conditioning systems, and two expans...

AI Technical Summary

Problems solved by technology

This two-way flow expansion valve connects two expansion valve components in parallel, with many parts, complex structure, and difficult assembly; moreover, multiple valve bodies and protective covers are welded and fixed together, and there are too many interfaces between channels or inlets and outlets. More potential leak points, resulting in poorer seals

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