Switching device for parallel evaporators

Abstract

The invention discloses a switching device for parallel evaporators. The switching device for the parallel evaporators comprises first and second evaporators, first and second check valves, a three-way pipe, a four-way reversing valve, a compressor and a gas-liquid separator, wherein the inlet end of the compressor is connected with the outlet end of the gas-liquid separator; the outlet end of the compressor is connected with a D opening of the four-way reversing valve; the first evaporator is connected with an E opening of the four-way reversing valve; the inlet end of the first check valve is connected with the outlet end of the second evaporator; the inlet end of the second check valve is connected with an S opening of the four-way reversing valve; the outlet ends of the first and second check valves are connected with two inlet ends of the three-way pipe respectively; and the outlet end of the three-way pipe is connected with the inlet end of the gas-liquid separator. According to the switching device for the parallel evaporators, by adding two check valves on a fluorine path, and the phenomenon that a unit abnormally runs caused by blow-by of fluorine when the evaporator on the heat source side is switched is effectively prevented.

Description

technical field [0001] The invention relates to the field of air-conditioning heat pump units, in particular to a switching device for parallel evaporators. Background technique [0002] At present, in response to the country's energy saving and emission reduction policies, some energy-saving products such as multi-source units or multi-functional multi-purpose air-conditioning heat pump units with heat recovery functions such as cooling, heating and domestic hot water have appeared on the market. Reasonable utilization improves the utilization rate of energy. These heat pump units are usually connected in parallel with heat exchangers. When the unit needs to switch between different heat exchangers to achieve a certain function, the unit will often have fluorine series and lack of fluorine, which will lead to abnormal operation of the unit. It cannot run stably for a long time. This also affects a bottleneck in the large-scale popularization and use of these heat pump ene...

AI Technical Summary

Problems solved by technology

These heat pump units are usually connected in parallel with heat exchangers. When the unit needs to switch between different heat exchangers to achieve a certain function, the unit will often have fluorine series and lack of fluorine, which will lead to abnormal operation of the unit. Can not run stably for a long time

This also affects a bottleneck in the large-scale promotion and use of these heat pump energy-saving units

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