Low refrigerant charging amount heat pump device and control method thereof

Abstract

The invention discloses a low refrigerant charging amount heat pump device and a control method thereof. The device comprises a compressor, a compressor refrigerant gas outlet is sequentially connected with an indoor heat exchanger, a throttling device and an outdoor heat exchanger through a four-way reversing valve, an outlet of the outdoor heat exchanger is connected with an inlet of a liquid storage device through the four-way reversing valve, an outlet of the liquid storage device is connected with an inlet of the compressor, and the device further comprises a bypass pipeline; an inlet of the bypass pipeline is located between the compressor and the four-way reversing valve, an outlet of the bypass pipeline is located between the four-way reversing valve and the liquid storage device or located on the side or bottom of a shell of the liquid storage device, and a bypass electromagnetic valve is located on the bypass pipeline; under the heating condition, when the device stably runs, a refrigerant exhausted out of the compressor flows into the indoor heat exchanger through the four-way reversing valve and then flows back to the compressor through the throttling device, the outdoor heat exchanger, the four-way reversing valve and the liquid storage device, and a heating cycle is formed; and under the refrigerating condition, stable running is opposite to the heating cycle flow path. The control method of the device is further provided. In the cold starting process, the problem that a large number of refrigerants are gathered in the liquid storage device and the compressor, and consequently the pressure of an air inlet of the compressor is too low is solved.

Description

technical field [0001] The invention belongs to the technical field of air conditioners, and in particular relates to a low refrigerant charge heat pump device and a control method thereof. Background technique [0002] In the past, hydrofluorocarbon (HFC) refrigerants were widely used in household air conditioners and small and medium-sized commercial air conditioners. However, due to the high greenhouse effect index (GWP) of these refrigerants, they have a greater impact on the environment. From the perspective of controlling global warming, relevant companies in various countries have successively started to use refrigerants with low GWP values. Therefore, it has been proposed to use refrigerants such as hydrofluoroolefin (HFO) R1234yf, hydrocarbon (HC) R290, R600a, R1270, etc., which have little influence on global warming. However, unlike previous HFC refrigerants, these refrigerants have more or less flammability (or slightly flammability) problems. [0003] In the a...

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Problems solved by technology

[0008] The occurrence of negative pressure may make the air refrigeration system, on the one hand, the air entering the system is likely to cause an explosion, on the other hand, it will affect the reliability of the compressor and the refrigeration system

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