Cold and warm type frequency conversion air conditioner and defrosting method thereof

Abstract

The invention discloses a cold and warm type frequency conversion air conditioner and a defrosting method thereof. The air conditioner comprises an indoor machine and an outdoor machine, wherein the outdoor machine is provided with a frequency conversion compressor, a four-way valve, a throttling element and an outdoor heat exchanger which are communicated through a connecting pipeline, and the connecting pipeline of the outdoor machine is also provided with a by-pass loop; and the indoor machine is internally provided with an electric heating device which is at least turned on to operate in the defrosting process of the air conditioner. The defrosting method for the air conditioner comprises that when a defrosting condition is reached, the electric heating device is turned on, and a by-pass defrosting process is carried out by the by-pass loop. The air conditioner and the defrosting method not only can guarantee the using comfort of users, but also can improve the defrosting efficiency of the air conditioner, and cannot influence the using reliability of the frequency conversion compressor of the air conditioner.

Description

technical field [0001] The invention relates to an air conditioner and a defrosting method thereof, in particular to a heating and cooling type frequency conversion air conditioner and a defrosting method which take into account both the comfort of use and the defrosting effect, and belongs to the technical field of air conditioners. Background technique [0002] Most of the traditional heating and cooling inverter air conditioners use the reverse defrosting method when defrosting. The structure of the reverse defrosting system is as follows: figure 1 shown. The air conditioner includes an indoor unit 100 and an outdoor unit 200, and the indoor unit 100 and the outdoor unit 200 are connected through a refrigerant connection pipeline. The indoor unit 100 is provided with an indoor heat exchanger 101 and an indoor fan 102; the outdoor unit 200 includes an outdoor heat exchanger 201, an inverter compressor 203, a four-way valve 204 and a throttling element connected through a ...

AI Technical Summary

Problems solved by technology

On the one hand, due to the reduction of the air intake of the indoor heat exchanger 101, the heating effect of the air conditioner is significantly reduced, and the blown cold air makes the user more uncomfortable; on the other hand, due to the air intake of the outdoor heat exchanger 201 less, resulting in slow defrosting

In addition, the indoor fan 102 is still in the working state, which increases the subcooling degree of the refrigerant coming out of the indoor heat exchanger 101, thereby further deteriorating the defrosting effect, prolonging the defrosting time, and affecting user comfort

In addition, under certain low temperature conditions or when the outdoor heat exchanger 201 is large, even if sufficient defrosting time is given, it is difficult to remove the frost on the outdoor heat exchanger 201

The gradual accumulation of frost will make subsequent defrosting more difficult, and the heating effect will gradually deteriorate, which will further affect the comfort of users

In addition, due to the longer defrosting time, the more liquid returns to the inverter compressor 203, it is easy to cause the liquid shock of the inverter compressor 203, and at the same time, the dilution rate of the oil becomes lower, which makes the internal lubrication of the inverter compressor 203 worse, so Will be obviously detrimental to the reliability of the inverter compressor 203

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