Vehicle-mounted heat pump air-conditioner with gas-replenishing and enthalpy-increasing function

Abstract

The invention discloses a vehicle-mounted heat pump air-conditioner with the gas-replenishing and enthalpy-increasing function. The vehicle-mounted heat pump air-conditioner comprises a compressor (1), a gas-liquid separator (12), a four-way valve (3), an evaporator (11), a gas-replenishing electronic expansion valve (10), an economizer (6), a main circuit electronic expansion valve (5), a condenser (4) and a check valve (8). A port E of the four-way valve is connected with an inlet of the evaporator, and an outlet of the evaporator sequentially passes through a first heat transfer channel ofthe economizer, the main circuit electronic expansion valve and the condenser and is connected with a port C of the four-way valve. The output end of the evaporator further sequentially passes throughthe gas-replenishing electronic expansion valve, a second heat transfer channel of the economizer and the check valve and is connected with a middle compression cavity of the compressor. A port D ofthe four-way valve is connected with an exhaust outlet of the compressor. The two ends of the gas-liquid separator are connected with a suction inlet of the compressor and a port S of the four-way valve correspondingly. The vehicle-mounted heat pump air-conditioner with the gas-replenishing and enthalpy-increasing function is particularly suitable for operating in a low-temperature environment, and the reliability is high.

Description

technical field [0001] The invention relates to a vehicle-mounted heat pump air conditioner with air supplement and enthalpy increase. Background technique [0002] At present, there are two difficult technical problems in the heating of domestic vehicle-mounted heat pump air conditioners. One is that when operating at low ambient temperature, the suction specific volume of the compressor increases and the pressure ratio is large, which causes a significant drop in the heating energy efficiency ratio. The heating capacity attenuation is severe; the second is that when the ambient temperature is lower than -15°C, due to the high pressure ratio of the compressor, the discharge temperature of the compressor is too high, which may easily cause the carbonization of the lubricating oil to fail, and the compressor will not be effectively lubricated and damaged , it is difficult for the heat pump to operate reliably and stably for a long time. Therefore, it is necessary to design a...

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Problems solved by technology

[0002] At present, there are two difficult technical problems in the heating of domestic vehicle-mounted heat pump air conditioners. One is that when operating at low ambient temperature, the suction specific volume of the compressor increases and the pressure ratio is large, which causes a significant drop in the heating energy efficiency ratio. The heating capacity attenuation is severe; the second is that when the ambient temperature is lower than -15°C, due to the high pressure ratio of the compressor, the discharge temperature of the compressor is too high, which may easily cause the carbonization of the lubricating oil to fail, and the compressor will not be effectively lubricated and damaged , it is difficult for the heat pump to operate reliably and stably for a long time

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