CN-121993870-A - Air conditioner and defrosting control method and device thereof, storage medium and program product

CN121993870ACN 121993870 ACN121993870 ACN 121993870ACN-121993870-A

Abstract

The invention provides an air conditioner and a defrosting control method, a device, a storage medium and a program product thereof, wherein the method comprises the steps of entering a first defrosting stage when a defrosting condition is met under the condition of heating operation; the method comprises the steps of controlling a compressor to perform frequency-reducing operation when a first preset condition is met, stopping frequency-reducing operation when the first preset condition is met, entering a second defrosting stage, controlling a four-way valve to perform reversing when the second defrosting stage is met, stopping frequency-increasing operation when the suction pressure value is detected to be in a preset pressure value interval and kept for a second preset time, entering a third defrosting stage when the second preset condition is met, controlling the compressor to perform frequency-reducing operation when the discharge pressure value is detected to be reduced to a safe reversing value and kept for a third preset time, or stopping frequency-reducing when the time of entering the third defrosting stage reaches the maximum time allowed by the third preset stage, reversing the four-way valve, and exiting defrosting. The scheme of the invention can shorten the time of reverse defrosting of the heat pump.

Inventors

LAN YUMING
TAN FENG
WANG RUIQIANG
CHEN RONGBIN
TANG LEI

Assignees

珠海格力电器股份有限公司

Dates

Publication Date: 20260508
Application Date: 20251224

Claims (10)

1. A defrosting control method of an air conditioner, comprising: Under the condition of the air conditioner heating operation, judging whether the air conditioner meets the condition of entering defrosting, and entering a first stage of defrosting when judging that the air conditioner meets the condition of entering defrosting; In the first defrosting stage, controlling the compressor to run at a preset frequency-reducing speed in a frequency-reducing mode, and when a first preset condition is met, controlling the compressor to stop frequency-reducing, and then exiting the first defrosting stage to enter a second defrosting stage; In the second defrosting stage, the four-way valve is controlled to change, the compressor is controlled to run at a preset ascending speed in an ascending mode, after the air suction pressure value is detected to be in a preset pressure value interval and kept for a second preset time, the compressor is controlled to stop ascending, and when a second preset condition is met, the second defrosting stage is exited, and a third defrosting stage is entered; And in the third defrosting stage, controlling the compressor to run in a frequency-reducing mode at a preset frequency-reducing speed, and after detecting that the exhaust pressure value is reduced to a safe reversing value and kept for a third preset time, or after the time for entering the third defrosting stage reaches the maximum allowable time in the preset third stage, controlling the compressor to stop the frequency-reducing mode, then controlling the four-way valve to reverse, exiting the third defrosting stage, and continuing the heating operation.
2. The method of claim 1, further comprising controlling the inner fan speed, the outer fan speed, and the throttle opening to be adjusted according to the defrost first stage preset values during the defrost first stage, wherein, The inner fan is controlled to run according to a first gear of the preset inner fan, the outer fan is controlled to run according to a second gear of the preset outer fan, and the opening of the throttling device is controlled to be reduced to a first preset opening.
3. The method of claim 1, further comprising controlling the throttle opening to increase to a preset maximum opening after controlling the four-way valve to switch back during the second defrost stage, and controlling the inner fan and the outer fan to be turned off.
4. The method of claim 1, further comprising, after controlling the four-way valve to change direction in the third defrost stage, controlling the speed of the inner fan, the speed of the outer fan, and the opening of the throttle device to be adjusted according to preset values in the third defrost stage, and after maintaining a fourth preset time, exiting the third defrost stage, wherein: And controlling the inner fan to be closed, controlling the outer fan to operate according to a first gear of the preset outer fan, and controlling the opening of the throttling device to be reduced to a second preset opening.
5. The method according to any one of claims 1-4, wherein the first preset condition comprises at least one of: The discharge pressure value is reduced to a preset safe reversing value and maintained for a first preset time, the time to enter the first stage of defrosting reaches a preset first stage of allowing maximum time and the compressor frequency is reduced to a preset minimum frequency value.
6. The method of any one of claims 1-4, wherein the second preset condition includes whether an outdoor ambient temperature, an outdoor heat exchanger temperature, and a defrost time satisfy preset conditions.
7. A defrosting control device of an air conditioner, comprising: the judging unit is used for judging whether the air conditioner meets the defrosting condition under the condition of heating operation of the air conditioner, and entering a first defrosting stage when judging that the air conditioner meets the defrosting condition; The first control unit is used for controlling the compressor to run in a frequency-reducing mode at a preset frequency-reducing speed in the first defrosting stage, controlling the compressor to stop frequency-reducing when a first preset condition is met, and then exiting the first defrosting stage to enter a second defrosting stage; The second control unit is used for controlling the four-way valve to change direction and controlling the compressor to run at a preset frequency-raising speed in the second defrosting stage, controlling the compressor to stop frequency-raising after detecting that the suction pressure value is in a preset pressure value interval and is kept for a second preset time, and exiting the second defrosting stage and entering a third defrosting stage when a second preset condition is met; And the third control unit is used for controlling the compressor to run in a frequency-reducing mode at a preset frequency-reducing speed in the third defrosting stage, and controlling the compressor to stop the frequency-reducing mode after detecting that the exhaust pressure value is reduced to a safe reversing value and the third preset time is maintained or after the time for entering the third defrosting stage reaches the maximum time allowed by the preset third stage, and then controlling the four-way valve to reverse, exiting the third defrosting stage and continuing the heating operation.
8. A storage medium having stored thereon a computer program which when executed by a processor performs the steps of the method of any of claims 1-6.
9. An air conditioner comprising a processor, a memory and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method of any one of claims 1 to 6 when the program is executed, or comprising the defrost control device of claim 7.
10. A computer program product comprising a computer program which, when executed by a processor, implements the steps of the method of any of claims 1-6.

Description

Air conditioner and defrosting control method and device thereof, storage medium and program product Technical Field The present invention relates to the field of control, and in particular, to an air conditioner and a defrosting control method, device, storage medium and program product thereof. Background When the ambient temperature is lower, after the air conditioner performs heating operation for a certain time, the phenomenon that the surface of the evaporator frosts is difficult to avoid, and the frost layer can influence the heat exchange of the evaporator and also influence the heating effect of the whole machine, so that defrosting is necessary after the heating operation is performed for a period of time. In the related art, the defrosting mode of the air conditioner may be classified into hot gas bypass defrosting, heat pump reverse defrosting, and electric heating defrosting. In the refrigeration cycle, the high-temperature and high-pressure gas discharged from the compressor is directly bypassed by one electromagnetic valve, and is directly led to the evaporator without passing through the condenser, and defrosting is performed by utilizing the sensible heat of the high-temperature and high-pressure gas. The method can provide heating capacity for the room while defrosting, and defrosting switching is rapid. However, the method is difficult to ensure uniformity of bypass gas during defrosting, and can not ensure complete defrosting of limited bypass gas, and the bypass part of refrigerant is not throttled by an expansion valve, so that defrosting efficiency is low, energy consumption is high, and the risk of overhigh system pressure or refrigerant liquid impact exists. The heat pump reverse defrosting is to switch the refrigerating/heating mode to make the high temperature and high pressure refrigerant flow reversely, and then defrost. The defrosting mode has good defrosting effect and higher defrosting efficiency. However, it is generally necessary to pause the compressor first and then start up for defrosting, and to switch from the defrosting mode back to the normal heating mode also requires to pause the compressor first and then start up. The defrosting reaction time is longer, the whole defrosting time is prolonged, the indoor temperature fluctuation is larger, and the user experience is influenced. Disclosure of Invention The main object of the present invention is to overcome the above-mentioned drawbacks of the related art, and to provide an air conditioner, a defrosting control method, a device, a storage medium and a program product thereof, so as to solve the problem that the reverse defrosting reaction time of the heat pump in the related art is long, and the user experience is affected. The invention provides a defrosting control method of an air conditioner, which comprises the steps of judging whether the air conditioner meets a defrosting condition under the condition of hot operation of the air conditioner, entering a first defrosting stage when the condition of defrosting is judged to be met, controlling the compressor to run down at a preset down-conversion speed in the first defrosting stage, controlling the compressor to stop down-conversion when the first preset condition is met, then exiting the first defrosting stage, entering a second defrosting stage, controlling a four-way valve to change over, controlling the compressor to run up at a preset up-conversion speed, controlling the compressor to stop up-conversion when an air suction pressure value is detected to be in a preset pressure value interval and kept for a second preset time, exiting the second defrosting stage when the second preset condition is met, entering a third defrosting stage, controlling the compressor to run down at the preset down-conversion speed in the third defrosting stage, and controlling the four-way valve to stop running after the air suction pressure value is detected to be reduced to a safe change over value and kept for a third preset time or after the time of entering the third defrosting stage reaches the preset time, and continuing to run the four-way valve to stop the defrosting. Optionally, the method further comprises the step of controlling the rotating speed of the inner fan, the rotating speed of the outer fan and the opening of the throttling device to be adjusted according to the preset value of the first defrosting stage, wherein the inner fan is controlled to operate according to the first gear of the preset inner fan, the outer fan is controlled to operate according to the second gear of the preset outer fan, and the opening of the throttling device is controlled to be reduced to the first preset opening. Optionally, the defrosting control device further comprises controlling the opening of the throttling device to be increased to a preset maximum opening after controlling the four-way valve to change direction in the second defrosting stage, and controlling the inner fan a