Air conditioner and defrosting method thereof

Abstract

The invention discloses an air conditioner and a defrosting method thereof. The air conditioner comprises a heat exchange system and a control system, wherein the heat exchange system comprises a compressor, a four-way valve, a first indoor heat exchanger, a second indoor heat exchanger, a throttling device, a first outdoor heat exchanger and a second outdoor heat exchanger, wherein an indoor unit adapter of the four-way valve is connected with the inlet pipe of the first indoor heat exchanger and / or the inlet pipe of the second indoor heat exchanger, and an outdoor unit adapter of the four-way valve is connected with the outlet pipe of the first outdoor heat exchanger and / or the outlet pipe of the second outdoor heat exchanger; and the outlet pipe of the first indoor heat exchanger and the outlet pipe of the second indoor heat exchanger are connected with the inlet pipe of the first outdoor heat exchanger and / or the inlet pipe of the second outdoor heat exchanger through the throttling device, the outlet pipe of the first outdoor heat exchanger is connected with the inlet pipe of the second outdoor heat exchanger, and the outlet pipe of the second outdoor heat exchanger is connected with the inlet pipe of the first outdoor heat exchanger. By adoption of the air conditioner and the defrosting method thereof, the indoor comfort degree is guaranteed, and meanwhile, the defrosting efficiency of the air conditioner is improved.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to an air conditioner and a defrosting method thereof. Background technique [0002] When the air conditioner is heating at low temperature in winter, frost will appear on the outdoor heat exchanger, which will affect the heating effect of the air conditioner. At present, the defrosting of air conditioners generally adopts the following two methods: [0003] 1. The four-way valve reversing defrosting method, that is, when defrosting, the four-way valve is reversing, changing from a heating cycle to a refrigeration cycle, and the indoor heat exchanger becomes an evaporator, which absorbs heat from the room, but this leads to a decrease in the indoor temperature. The drop is obvious, seriously affecting the comfort of the room. [0004] 2. Hot gas bypass defrosting mode, that is, during defrosting, the high-temperature gas discharged from the compressor flows into the outdoor ...

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Problems solved by technology

During this process, only a small pressure drop occurs in the bypass solenoid valve in the system, resulting in a small high and low pressure difference, and the input power of the compressor is seriously attenuated; when the high-temperature steam flows into the outdoor heat exchanger in a low-temperature environment, the heat exchange efficiency Better, the refrigerant after flowing out of the outdoor heat exchanger has become a liquid refrigerant, resulting in low suction temperature of the compressor; the combined influence of these two factors has caused the exhaust temperature to attenuate extremely seriously. When the frost layer is thick, As the defrosting time continues, the exhaust gas temperature will drop to the point where defrosting is basically impossible, and the defrosting time will be long

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