Expansion switch valve

Abstract

The invention provides an expansion switch valve. The expansion switch valve comprises a valve body (500), wherein an inlet (501), an outlet (502) and an inner flow passage communicating between the inlet and the outlet are formed in the valve body (500), a first valve element (503) and a second valve element (504) which are parallel to each other are installed on the inner flow passage, and the first valve element (503) enables the inlet and the outlet to directly communicate or be disconnected; and the second valve element (504) enables the inlet and the outlet to communicate or be disconnected through a throttling hole (505). In this way, the first valve element and the second valve element are integrally installed on the inner flow passage of the same valve body, so that the on-off control function or the throttling expansion control function of a refrigerant can be realized, the structure is simple, and the production and the installation are easy. When the expansion switch valveis applied to a heat pump system, the pipeline connection can be simplified, the cost can be reduced, the refrigerant filling amount of the whole heat pump system is reduced, and the 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 switch 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-temperat...

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.

Images