Liquid impact preventing air conditioner defrosting system

Abstract

The invention discloses a liquid impact preventing air conditioner defrosting system. The liquid impact preventing air conditioner defrosting system comprises a compressor (1), a four-way reversing valve (2), an indoor unit heat exchanger (3), a throttling device (4) and an outdoor unit heat exchanger (5). Four ports of the four-way reversing valve (2) are connected with an outlet of the compressor (1), one end of the indoor unit heat exchanger (3), one end of the outdoor unit heat exchanger (5) and an inlet of the compressor (1) respectively. The two ends of the throttling device (4) are connected with the other end of the indoor unit heat exchanger (3) and the other end of the outdoor unit heat exchanger (5). A liquid storage tank (6) capable of separating gas-liquid two-phase refrigerating fluid is arranged between the four-way reversing valve (2) and the inlet of the compressor (1) and is capable of preventing liquid impact. A heating coil (9) and an electric heater (7) are arranged in the liquid storage tank (6), high-temperature and high-pressure refrigerating fluid gas can be provided for the outdoor unit heat exchanger (5) for defrosting, and it can be guaranteed that the indoor unit heat exchanger (3) can continuously provide heat for a room in the defrosting process.

Description

technical field [0001] The invention relates to an air-conditioning system, in particular to a liquid shock-proof air-conditioning defrosting system, which belongs to the technical field of refrigeration and air-conditioning. Background technique [0002] When the air conditioning system is running in winter heating conditions, the low-temperature refrigerant liquid in the heat exchanger tube of the outdoor unit absorbs heat from the ambient air through the fins of the heat exchanger. When the fin temperature of the heat exchanger of the outdoor unit is lower than the dew point temperature of the ambient air, the water vapor in the air will condense on the fin surface; when the fin temperature is lower than 0°C, the condensate will freeze and grow gradually on the fin surface into frost. The formation of frost increases the heat transfer resistance between the fins and the air, which will easily lead to insufficient evaporation of the refrigerant in the heat exchanger of th...

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Problems solved by technology

Chinese Patent Publication (Announcement) No. CN203964453 patent "air conditioner with hot gas bypass circuit" keeps the heating mode of the air conditioning system unchanged, by bypassing a part of the high-temperature refrigerant gas at the outlet of the compressor to the heat exchanger of the outdoor unit to discharge The heat is used to melt the frost layer. At this time, the refrigerant in the heat exchanger tube of the outdoor unit will easily reach a two-phase state after heat release, which will cause liquid shock and damage to the compressor.

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