Expansion switch valve

Abstract

The invention provides an expansion switch valve which comprises a valve body. An inlet, a first outlet, a second outlet and an inner runner communicating among the inlet, the first outlet and the second outlet are formed in the valve body. The inner runner is provided with a first valve element (503) and a second valve element (504), the inlet and the first outlet communicate directly or are isolated through the first valve element (503), and the inlet and the second outlet communicate through a throttling hole (505) or are isolated through the second valve element (504). Thus, by integrallyinstalling the first valve element and the second valve element on the inner runner of the same valve body, the refrigerant circulation and cut-off control and / or throttling expansion control functioncan be achieved, the structure is simple, and production and installation are easy; and when the expansion switch valve provided by the invention is applied to a heat pump system, pipe connection canbe simplified, the cost is reduced, the refrigerant filling amount of the whole heat pump system is reduced, and oil return of a compressor is facilitated.

Description

technical field [0001] The present disclosure relates to the field of control valves, in particular, to an expansion switch valve. Background technique [0002] In the heat pump system, it is sometimes necessary to control the throttling and depressurization of the refrigerant or only pass through without throttling, but the existing electronic expansion valve can only control the refrigerant throttling or not. In order to meet this requirement of the heat pump system, the prior art uses a structure in which an electronic expansion valve and an electromagnetic switching valve are connected in parallel. This structure requires two tee joints and six pipelines, and the structure is relatively complicated and inconvenient to install. When the solenoid valve is closed and the electronic expansion valve is used, the inlet of the electronic expansion valve is a medium-temperature and high-pressure liquid refrigerant, and the outlet of the electronic expansion valve is a low-tempe...

AI Technical Summary

Problems solved by technology

This structure requires two tee joints and six pipelines, the structure is relatively complicated and it is not easy to install

When the solenoid valve is closed and the electronic expansion valve is used, the inlet of the electronic expansion valve is a medium-temperature and high-pressure liquid refrigerant, and the outlet of the electronic expansion valve is a low-temperature and low-pressure liquid refrigerant. Since the pipelines are connected, the inlet and outlet of the solenoid valve are also separated. The state of the refrigerant at the inlet and outlet of the electronic expansion valve is consistent, and the pressure and temperature of the refrigerant at the inlet and outlet of the solenoid valve are different, which is easy to cause damage to the internal structure of the solenoid valve

In addition, due to the large number of pipelines, the refrigerant charging amount of the entire heat pump system will be increased, and the cost will be increased.

When the heat pump system works at low temperature, it is difficult for the compressor to return oil, and this complex structure is not conducive to the oil return of the heat pump system.

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