CN110836499B - Defrosting control method for air conditioner - Google Patents

Defrosting control method for air conditioner Download PDF

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Publication number
CN110836499B
CN110836499B CN201810941849.7A CN201810941849A CN110836499B CN 110836499 B CN110836499 B CN 110836499B CN 201810941849 A CN201810941849 A CN 201810941849A CN 110836499 B CN110836499 B CN 110836499B
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Prior art keywords
air conditioner
set time
fan
control method
time
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CN201810941849.7A
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CN110836499A (en
Inventor
许文明
王飞
付裕
罗荣邦
丁爽
袁俊军
张心怡
李皖皖
李阳
董旭
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Qingdao Haier Air Conditioner Gen Corp Ltd
Haier Smart Home Co Ltd
Chongqing Haier Air Conditioner Co Ltd
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Qingdao Haier Air Conditioner Gen Corp Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/42—Defrosting; Preventing freezing of outdoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • F25B47/022—Defrosting cycles hot gas defrosting
    • F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2347/00—Details for preventing or removing deposits or corrosion
    • F25B2347/02—Details of defrosting cycles

Abstract

The invention belongs to the technical field of air conditioners, and particularly relates to a defrosting control method of an air conditioner. In order to improve the defrosting efficiency of the air conditioner, the defrosting control method of the air conditioner provided by the invention aims at the air conditioner with double fans arranged on an outdoor unit, and the method comprises the following steps: detecting the current I of the upper fanOn the upper partAnd current I of lower fanLower part(ii) a When I isUp/orIe is greater than or equal to a first preset value and ILower-When the/Ie is larger than or equal to a first preset value, enabling the air conditioner to enter a defrosting mode; after the air conditioner enters a defrosting mode, controlling the upper fan and the lower fan to stop rotating; after the first set time, only controlling the upper fan to reversely rotate for a second set time; after the first set time, controlling the lower fan to rotate reversely for a second set time, and controlling the upper fan to rotate reversely for a third set time; and after the second set time, only controlling the lower fan to reversely rotate for the second set time. The invention controls the fans at the corresponding positions to reversely rotate in a matching manner according to the melting sequence of frost, thereby accurately blowing off the frost layer and greatly improving the defrosting efficiency of the air conditioner.

Description

Defrosting control method for air conditioner
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a defrosting control method of an air conditioner.
Background
The air conditioner as a device capable of adjusting the indoor environment temperature has the working principle that: the indoor environment temperature is lowered or raised by the refrigerant switching between the circulation lines through the high pressure/low pressure/gas/liquid state, namely, the air conditioner is in the cooling or heating working condition from the perspective of the indoor unit. When the air conditioner heats the operation, if outdoor coil pipe temperature under certain humidity condition crosses lowly can lead to the condition of frosting, and outdoor coil pipe frosting can lead to outdoor heat exchanger's heat exchange efficiency to reduce, influences the heating effect of air conditioner, reduces indoor environment's travelling comfort, influences user experience. Therefore, in the situation that the air conditioner is in the heating working condition, the outdoor coil of the air conditioner needs to be defrosted timely and effectively.
In the prior art, an air conditioner basically adopts reverse cycle defrosting (i.e., the outdoor unit is defrosted by switching the direction of a four-way valve) or bypass defrosting (the outdoor unit is defrosted by opening a bypass branch), and whether to quit defrosting is judged by monitoring defrosting time or certain parameters such as the temperature of an external coil pipe. And lack the auxiliary means in the defrosting process and accelerate defrosting efficiency, lead to current defrosting process singleness, efficiency is lower.
Therefore, there is a need in the art for a new defrost control method to improve the defrost efficiency of an air conditioner.
Disclosure of Invention
Based on the above problems in the background art, in order to improve the defrosting efficiency of the air conditioner, the invention provides a defrosting control method of the air conditioner, wherein an outdoor unit of the air conditioner comprises an upper fan and a lower fan, and the method comprises the following steps: detecting the current I of the upper fanOn the upper partAnd current I of the lower fanLower part(ii) a When I isUp/orIe is greater than or equal to a first preset value and ILower-When the/Ie is larger than or equal to a first preset value, enabling the air conditioner to enter a defrosting mode; after the air conditioner enters a defrosting mode, controlling the upper fan and the lower fan to stop rotating; after the first set time, only controlling the upper fan to reversely rotate for a second set time; after the first set time, controlling the lower fan to rotate reversely for a second set time, and controlling the upper fan to rotate reversely for a third set time; after a second set time, only controlling the lower fan to reversely rotate for a second set time; wherein Ie is a current value of the upper fan and the lower fan measured in a state where the outdoor unit is not frosted.
In a preferred embodiment of the above defrosting control method for an air conditioner, the first preset value is any value between 1 and 1.2.
In a preferred embodiment of the above defrosting control method for an air conditioner, the first preset value is 1.1.
In a preferred embodiment of the above-mentioned defrosting control method of an air conditioner, the first set time is any time between 2 and 4 minutes.
In a preferred embodiment of the above-described air conditioner defrost control method, the first set time is 3 minutes.
In a preferred embodiment of the above air conditioner defrosting control method, the second set time is any time between 14 and 16 seconds; and/or the third set time is any time between 9 and 11 seconds.
In a preferred embodiment of the above air conditioner defrosting control method, the second set time is 15 seconds; and/or the third set time is 10 seconds.
In a preferred embodiment of the above-described air conditioner defrost control method, the method further includes: detecting the temperature of an external coil of the air conditioner; when the temperature of the external coil is higher than the set temperature, detecting the continuous operation time of the air conditioner in the state; and if the continuous operation time is higher than a first preset time, enabling the air conditioner to exit the defrosting mode.
In a preferred embodiment of the above air conditioner defrosting control method, the first preset time is any time between 15 and 25 seconds.
In a preferred embodiment of the above air conditioner defrosting control method, the first preset time is 20 seconds.
The air conditioner defrosting control method mainly judges whether the air conditioner enters a defrosting mode according to the current of the upper fan and the current of the lower fan, and selectively controls the upper fan and/or the lower fan to rotate reversely according to the time sequence after the air conditioner enters the defrosting mode so as to blow off the melted frost layer. And because the frost layer is the trend of melting from top to bottom, therefore, when controlling upper blower and lower fan reversal simultaneously, can make lower fan reversal time longer than upper blower reversal time a little, if make lower fan reversal 15 seconds, upper blower reversal 10 seconds, further promote the blowback effect. Compared with the traditional defrosting mode, namely the condition that the frost layer is required to be gradually separated from the outdoor unit or completely melted into water, the defrosting method can more quickly finish defrosting operation and effectively reduce the influence of the defrosting process on the indoor temperature.
Drawings
Fig. 1 is a main flowchart of a defrosting control method of an air conditioner according to the present invention.
Detailed Description
In order to make the embodiments, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the embodiments are some, but not all embodiments of the present invention. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
The defrosting control method of the invention mainly aims at the air conditioner with double fans arranged on an outdoor unit. Specifically, the present invention is directed to an air conditioner, in which an outdoor unit includes an upper fan and a lower fan, and the upper fan and the lower fan may independently rotate in forward or reverse directions.
Referring to fig. 1, fig. 1 is a main flowchart of a defrosting control method of an air conditioner according to the present invention. As shown in fig. 1, the defrosting control method of an air conditioner of the present invention includes: s110, detecting the current I of the upper fanOn the upper partAnd current I of lower fanLower part(ii) a S120, when IUp/orIe is greater than or equal to a first preset value and ILower-When the/Ie is larger than or equal to a first preset value, enabling the air conditioner to enter a defrosting mode; s130, after the air conditioner enters a defrosting mode, controlling the upper fan and the lower fan to stop rotating; s140, after the first set time, only controlling the upper fan to reversely rotate for a second set time; s150, after the first set time, controlling the lower fan to rotate reversely for a second set time, and controlling the upper fan to rotate reversely for a third set time; and S160, after the first set time, only controlling the lower fan to reversely rotate for a second set time. Wherein Ie is a current value of the upper fan and the lower fan measured in a state where the outdoor unit is not frosted. As an example, the first set time may be 3 minutes, or any time between 2 and 4 minutes is selected; the second set time can be 15 seconds, or any time between 14 and 16 seconds is selected; the third set time is 10 seconds, or any time between 9 and 11 seconds is selected. The skilled person can also flexibly select other reasonable setting time according to the actual application scenario.
As described above, in the defrosting process, whether the air conditioner enters the defrosting mode is judged according to the current of the upper fan and the current of the lower fan, and after the air conditioner enters the defrosting mode, the upper fan and/or the lower fan are/is selectively controlled to rotate reversely according to the time sequence so as to blow off the melted frost layer, so that the defrosting efficiency is improved. The technical personnel in the field can understand that, in the process of defrosting the air conditioner, because hot refrigerant flows in from the upper part of the outdoor heat exchanger, and the frost layer is also melted from the upper part of the outdoor unit downwards, according to the defrosting time sequence, the upper fan is controlled to independently reverse, then the upper fan and the lower fan are controlled to simultaneously reverse, then the lower fan is controlled to independently reverse, and the fans at corresponding positions are controlled to reversely rotate in a matching manner according to the frost melting sequence, so that the frost layer is accurately blown off, and the defrosting efficiency of the air conditioner is greatly improved. The frost layer is the trend of melting from top to bottom, so when the upper fan and the lower fan are controlled to rotate reversely simultaneously, the reverse time of the lower fan can be longer than that of the upper fan, if the lower fan rotates for 15 seconds and the upper fan rotates for 10 seconds, the reverse blowing effect is further improved. Compared with the traditional defrosting mode, namely the condition that the frost layer is required to be gradually separated from the outdoor unit or completely melted into water, the defrosting method can more quickly finish defrosting operation and effectively reduce the influence of the defrosting process on the indoor temperature.
In step S120, the first preset value may be 1.1, or may be any value between 1 and 1.2. According to experimental test results, the current of the outdoor fan is correspondingly changed along with the frosting degree of the outdoor coil pipe, and the current of the outdoor fan tends to increase along with the increase of the frosting thickness of the outdoor unit. Therefore, the current of the outdoor fan is changed along with the change of the frosting degree of the outdoor coil pipe, so that the frosting degree of the outdoor coil pipe is judged, the limitation of judging the frosting degree by adopting the temperature of the outdoor coil pipe in the prior art can be effectively eliminated, and the defrosting time of the air conditioner is accurately judged. For the air conditioner with the outdoor unit being the double-fan air conditioner, the current of the upper fan and the current of the lower fan can respectively reflect the frosting condition of the upper part and the lower part of the outer coil pipe, so that the defrosting time of the air conditioner can be more accurately judged according to the current of the upper fan and the lower fan.
The defrosting control method of the air conditioner further comprises the step of exiting the defrosting mode. For example, after the air conditioner enters the defrosting mode, the temperature of the external coil of the air conditioner is detected, when the temperature of the external coil is higher than a set temperature (which can be reasonably set by a person skilled in the art according to the practical application scenario of the air conditioner), the continuous operation time of the air conditioner in the state is detected, when the continuous operation time is higher than a first preset time, for example, the continuous operation time is higher than 20 seconds (or any time between 15 and 25 seconds), it can be judged that the frost layer of the external coil is removed, and at this time, the air conditioner is exited from the defrosting mode.
In summary, the air conditioner defrosting control method of the present invention mainly determines whether to enable the air conditioner to enter the defrosting mode according to the current of the upper fan and the current of the lower fan, and selectively controls the upper fan and/or the lower fan to reverse according to the time sequence after the air conditioner enters the defrosting mode to blow off the melted frost layer. And because the frost layer is the trend of melting from top to bottom, therefore, when controlling upper blower and lower fan reversal simultaneously, can make lower fan reversal time longer than upper blower reversal time a little, if make lower fan reversal 15 seconds, upper blower reversal 10 seconds, further promote the blowback effect. Compared with the traditional defrosting mode, namely the condition that the frost layer is required to be gradually separated from the outdoor unit or completely melted into water, the defrosting method can more quickly finish defrosting operation and effectively reduce the influence of the defrosting process on the indoor temperature.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims (10)

1. An air conditioner defrosting control method, an outdoor unit of the air conditioner comprises an upper fan and a lower fan, and the method is characterized by comprising the following steps:
detecting the current I of the upper fanOn the upper partAnd current I of the lower fanLower part；
When I isUp/orIe is greater than or equal to a first preset value and ILower-When the/Ie is larger than or equal to a first preset value, enabling the air conditioner to enter a defrosting mode;
after the air conditioner enters a defrosting mode, controlling the upper fan and the lower fan to stop rotating;
after the first set time, only controlling the upper fan to reversely rotate for a second set time;
after the first set time, controlling the lower fan to rotate reversely for a second set time, and controlling the upper fan to rotate reversely for a third set time;
after a second set time, only controlling the lower fan to reversely rotate for a second set time;
wherein Ie is a current value of the upper fan and the lower fan measured in a state where the outdoor unit is not frosted.
2. The air conditioner defrost control method of claim 1, wherein the first preset value is any value between 1-1.2.
3. The air conditioner defrost control method of claim 2, wherein the first preset value is 1.1.
4. The air conditioner defrost control method of claim 3, wherein the first set time is any time between 2-4 minutes.
5. The air conditioner defrost control method of claim 4, wherein the first set time is 3 minutes.
6. The air conditioner defrost control method of claim 5, wherein the second set time is any time between 14-16 seconds; and/or
The third set time is any time between 9 and 11 seconds.
7. The air conditioner defrost control method of claim 6, wherein the second set time is 15 seconds; and/or
The third setting time is 10 seconds.
8. The air conditioner defrost control method of any one of claims 1-7, further comprising:
detecting the temperature of an external coil of the air conditioner;
when the temperature of the external coil is higher than the set temperature, detecting the continuous operation time of the air conditioner in the state;
and if the continuous operation time is higher than a first preset time, enabling the air conditioner to exit the defrosting mode.
9. The air conditioner defrost control method of claim 8, wherein the first preset time is any time between 15-25 seconds.
10. The air conditioner defrost control method of claim 9, wherein the first preset time is 20 seconds.
CN201810941849.7A 2018-08-17 2018-08-17 Defrosting control method for air conditioner Active CN110836499B (en)

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CN110836499B true CN110836499B (en) 2021-07-30

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Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6441782A (en) * 1987-08-07 1989-02-14 Toshiba Corp Heat pump type air conditioner
CN104515330A (en) * 2013-09-27 2015-04-15 海尔集团公司 Method for controlling defrosting operation of air-conditioner
JP6486335B2 (en) * 2014-04-22 2019-03-20 日立ジョンソンコントロールズ空調株式会社 Air conditioner and its defrosting operation method
CN106871338A (en) * 2017-01-19 2017-06-20 青岛海尔空调器有限总公司 A kind of air-conditioner defrosting control method
CN107328026B (en) * 2017-07-31 2019-06-25 珠海格力电器股份有限公司 Blower control method and device, air-conditioner outdoor unit

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Effective date of registration: 20210802

Address after: No.1 Gangcheng South Road, Jiangbei District, Chongqing, 400026

Patentee after: CHONGQING HAIER AIR-CONDITIONER Co.,Ltd.

Patentee after: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd.

Patentee after: Haier Zhijia Co.,Ltd.

Address before: 266101 Haier Industrial Park, 1 Haier Road, Laoshan District, Shandong, Qingdao

Patentee before: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd.

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