Air conditioner device

Abstract

This invention provides an air-conditioner that continues a heating operation while performing a defrosting operation. A first bypass circuit 6 is provided for connecting the portion of a heat-pump-type refrigerating cycle between an indoor heat exchanger 3 and a decompressor 4 to the suction side of a compressor 1. The first bypass valve 6 is provided with a two-way valve 7 and a refrigerant heater 8. Further, a second bypass circuit 9 is provided for connecting the portion between a four-way valve 2 and the indoor heat exchanger 3 to the portion between the decompressor 4 and an outdoor heat exchanger 5. The second bypass circuit 9 is provided with a defrosting two-way valve 10. To defrost the outdoor heat exchanger 5, the decompressor 4 and the defrosting two-way valve 10 are closed according to outside air temperature and a fan 19 is rotated to perform a first defrosting operation. When the temperature detected by the temperature means of the outdoor heat exchanger is less than a predetermined value while the first defrosting operation is within a preset period of time, the two-way valve of the second bypass circuit is opened and an outdoor fan is stopped to perform a second defrosting operation.

Description

technical field [0001] The present invention relates to an air conditioner capable of performing a defrosting operation for removing frost adhering to an outdoor heat exchanger while continuing heating during heating operation by heat pump operation. Background technique [0002] In the past, the defrosting method of this kind of heat pump type air conditioner usually adopts the defrosting method of switching the four-way valve so that the refrigerant in the refrigeration cycle flows in the opposite direction. [0003] That is, in the defrosting operation, the refrigerant flow direction is the same as that during cooling, and the high-temperature and high-pressure refrigerant flows to the outdoor heat exchanger to melt frost adhering to the heat exchanger. [0004] In this defrosting method, there is a basic problem that the temperature of the room inside the room is lowered and a feeling of cool air is felt because the heat exchanger on the inside of the room becomes an eva...

AI Technical Summary

Problems solved by technology

[0004] In this defrosting method, there is the following basic problem: Since the heat exchanger on the inside of the room becomes an evaporator during defrosting, the temperature of the room in the room drops and a feeling of cool air is felt.

[0014] Therefore, this refrigeration cycle requires four two-way valves, which is a complicated and expensive method

[0015] In addition, since the refrigerant used for defrosting and the refrigerant dissipated in the indoor heat exchanger 110 merge, if the pressure of the refrigerant at the junction is higher than the pressure of the refrigerant used for defrosting, the refrigerant will If it flows to the outdoor heat exchanger, if it is reversed, the refrigerant will flow to the indoor side, so that the defrosting operation cannot be performed while heating.

[0016] In addition, since the refrigerant used for defrosting merges with the refrigerant that dissipates heat in the indoor heat exchanger 110, refrigerant noise (refrigerant noise) is likely to occur. In order to solve the above-mentioned pressure balance and refrigerant noise problems, , sometimes requiring a refrigerant combiner

[0017] In addition, since the amount of refrigerant circulation at the confluence increases and the pressure loss increases, it is necessary to increase the diameter of the pipe as a countermeasure, and there is also a structural problem of increasing the size of the heater.

[0018] Furthermore, since the temperature of the refrigerant heater 104 is lowered by the low-pressure refrigerant in a normal state inside the piping of the refrigerant heater 104 when operating in a refrigeration circuit, dew condensation is likely to occur on the refrigerant heater 104, and even if Condensation also occurs on the refrigerant heater when refrigerant leaks due to failure of the two-way valve 108, especially when a heat conduction heat source is used in the refrigerant heater, etc., in terms of reliability and safety of the refrigerant heater There is a big problem

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