CN110836439A - Defrosting control method for air conditioner - Google Patents
Defrosting control method for air conditioner Download PDFInfo
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- CN110836439A CN110836439A CN201810939463.2A CN201810939463A CN110836439A CN 110836439 A CN110836439 A CN 110836439A CN 201810939463 A CN201810939463 A CN 201810939463A CN 110836439 A CN110836439 A CN 110836439A
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- air conditioner
- outdoor fan
- time
- defrosting
- current value
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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
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- F24F11/62—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
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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
- F24F11/62—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
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- 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
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Human Computer Interaction (AREA)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
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 method provided by the invention comprises the following steps: after the air conditioner enters a defrosting mode, controlling an outdoor fan to stop rotating; and when the outdoor fan stops rotating for more than the set time, controlling the outdoor fan to continuously rotate reversely. In the technical scheme of the invention, because frost on the indoor and outdoor coil pipes is partially melted within a set time, the outdoor fan is controlled to reversely rotate, and the frost layer of the outdoor unit is blown off more easily and quickly in the defrosting process by utilizing the reverse blowing action of the outdoor fan, so that the defrosting efficiency is 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.
Description
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, which comprises the following steps: after the air conditioner enters a defrosting mode, controlling an outdoor fan to stop rotating; and when the outdoor fan stops rotating for more than the set time, controlling the outdoor fan to continuously rotate reversely.
In a preferred embodiment of the above defrosting control method for an air conditioner, the setting time is any time between 110 and 130 seconds; or the set time is 120 seconds.
In a preferred embodiment of the above-mentioned defrosting control method for an air conditioner, before the step of "controlling the outdoor fan to stop rotating after the air conditioner enters the defrosting mode", the method further includes: detecting the temperature of an external coil of the air conditioner; when the temperature of the external coil is lower than the dew point 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 enter a defrosting mode.
In a preferred embodiment of the above defrosting control method for an air conditioner, before the step of controlling the outdoor fan to continuously reverse after the air conditioner enters the defrosting mode, the method further includes: detecting a real-time current value of the outdoor fan; calculating the ratio of the real-time current value of the outdoor fan to a first standard current value; if the ratio is larger than a first preset value, enabling the air conditioner to enter a defrosting mode; the first standard current value is a current value of positive rotation of the outdoor fan measured in a state that the outdoor unit is not frosted.
In a preferred embodiment of the above defrosting control method for an air conditioner, before the step of controlling the outdoor fan to continuously reverse after the air conditioner enters the defrosting mode, the method further includes: detecting a real-time current value of the outdoor fan; calculating the ratio of the real-time current value of the outdoor fan to a first standard current value; if the ratio is larger than a first preset value, detecting the temperature of an outer coil of the air conditioner; when the temperature of the external coil is lower than the dew point temperature, detecting the continuous operation time of the air conditioner in the state; if the continuous operation time is higher than a first preset time, enabling the air conditioner to enter a defrosting mode; the first standard current value is a current value of positive rotation of the outdoor fan measured in a state that the outdoor unit is not frosted.
In a preferred embodiment of the above defrosting control method of an air conditioner, the first preset time is any time between 35 and 45 minutes; or the first preset time is 40 minutes.
In a preferred embodiment of the above defrosting control method for an air conditioner, the first preset value is any value between 1.1 and 1.3; or the first preset value is 1.2.
In a preferred embodiment of the above-mentioned defrosting control method of an air conditioner, after the step of "controlling the outdoor fan to continuously reverse after the outdoor fan stops rotating for more than a set time", the method further comprises: 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 second preset time, enabling the air conditioner to exit the defrosting mode.
In a preferred embodiment of the above defrosting control method of an air conditioner, the second preset time is any time between 15 and 25 seconds; or the second preset time is 20 seconds.
In a preferred embodiment of the above-mentioned defrosting control method for an air conditioner, after the step of controlling the outdoor fan to continuously reverse after the air conditioner enters the defrosting mode, the method further comprises: detecting a real-time current value of the outdoor fan; when the real-time current value of the outdoor fan is equal to a second standard current value, enabling the air conditioner to exit a defrosting mode; wherein the second standard current value is a current value of the outdoor fan in reverse rotation measured in a state where the outdoor unit is not frosted.
The defrosting control method of the air conditioner mainly comprises the steps of firstly controlling the outdoor fan to stop for a set time after the air conditioner enters a defrosting mode, and then controlling the outdoor fan to continuously rotate reversely until defrosting is finished. Because frost on the indoor and outdoor coil pipes is partially melted within a set time, the outdoor fan is controlled to rotate reversely, and a frost layer of the outdoor unit is blown off more easily and quickly in the defrosting process by utilizing the reverse blowing effect of the outdoor fan, so that the defrosting efficiency is 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.
Drawings
FIG. 1 is a main flow chart of the defrosting control method of the air conditioner of the present invention;
FIG. 2 is a flow chart of a defrosting control method for an air conditioner according to a first embodiment of the present invention;
FIG. 3 is a flow chart of a defrosting control method for an air conditioner according to a second embodiment of the present invention;
fig. 4 is a flowchart of a defrosting control method of an air conditioner according to a third embodiment of 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.
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, after the air conditioner enters a defrosting mode, controlling an outdoor fan to stop rotating; and S120, controlling the outdoor fan to continuously rotate reversely after the outdoor fan stops rotating for more than the set time. As an example, the set time may be 120 seconds, or any time between 110 seconds and 130 seconds may be selected, and those skilled in the art may flexibly select other reasonable set times according to the actual application scenario. At present, in the defrosting process of the prior art, the outdoor fan is usually in a stop state, and after the air conditioner enters the defrosting mode, the outdoor fan is controlled to stop rotating for a set time, and then the outdoor fan is controlled to continuously rotate reversely. Therefore, in the defrosting process, because frost on the indoor and outdoor coil pipes is partially melted within a set time, the outdoor fan is controlled to reversely rotate, and the frost layer of the outdoor unit is blown off more easily and quickly in the defrosting process by utilizing the reverse blowing effect of the outdoor fan, so that the defrosting efficiency is 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.
Referring to fig. 2, fig. 2 is a flowchart of a defrosting control method for an air conditioner according to a first embodiment of the present invention. As shown in fig. 2, in the first embodiment, the method of the present invention comprises the following steps: s210, detecting the temperature of an external coil of the air conditioner; when the temperature of the external coil is lower than the dew point temperature, the step S220 is carried out, and the continuous operation time of the air conditioner in the state is detected; if the continuous operation time is higher than the first preset time, for example, the continuous operation time is higher than 40 minutes (the first preset time can also be any time between 35 and 45 minutes), the step S230 is entered, and the air conditioner is entered into the defrosting mode; after the air conditioner enters the defrosting mode, the method proceeds to step S240, the outdoor fan is controlled to stop rotating, and the outdoor fan is controlled to continuously reverse after a set time.
In this first embodiment, the dew point temperature is the temperature at which the air is cooled to saturation without changing both the moisture content and the air pressure. That is, when the temperature of the outer coil is lower than the dew point temperature, it indicates that the outer coil is in the condition of frosting, i.e. the outer coil is easy to frost. Therefore, the invention judges whether the defrosting is needed or not by judging the duration time of the temperature of the external coil pipe being lower than the dew point temperature, so that the defrosting time of the air conditioner is more accurate.
Referring to fig. 3, fig. 3 is a flowchart of an air conditioner defrosting control method according to a second embodiment of the present invention. As shown in fig. 3, in the second embodiment, the method of the present invention includes the following steps: s310, detecting a real-time current value of the outdoor fan; s320, calculating the ratio of the real-time current value of the outdoor fan to the first standard current value; if the ratio is greater than the first preset value, for example, the ratio is greater than 1.2 (the first preset value may also be any value between 1.1 and 1.3), step S330 is performed to enable the air conditioner to enter the defrosting mode; after the air conditioner enters the defrosting mode, the method goes to step S340, the outdoor fan is controlled to stop rotating, and the outdoor fan is controlled to continuously rotate reversely after the set time. The first standard current value is a current value of positive rotation of the outdoor fan measured in a state that the outdoor unit is not frosted.
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.
Referring to fig. 4, fig. 4 is a flowchart of a defrosting control method of an air conditioner according to a third embodiment of the present invention. As shown in fig. 4, in this third embodiment, the method of the present invention includes the following steps: s410, detecting a real-time current value of the outdoor fan; s420, calculating the ratio of the real-time current value of the outdoor fan to the first standard current value; if the ratio is greater than the first preset value, for example, the ratio is greater than 1.2 (the first preset value may also be any value between 1.1 and 1.3), step S430 is performed to detect the temperature of the external coil of the air conditioner; when the temperature of the external coil is lower than the dew point temperature, the step S440 is carried out, and the continuous operation time of the air conditioner in the state is detected; if the continuous operation time is higher than the first preset time, for example, the continuous operation time is higher than 40 minutes (the first preset time can also be any time between 35 and 45 minutes), the step S450 is entered, and the air conditioner is entered into the defrosting mode; after the air conditioner enters the defrosting mode, the method proceeds to step S460, the outdoor fan is controlled to stop rotating, and the outdoor fan is controlled to continuously reverse after a set time.
In the embodiment, whether the air conditioner needs to enter the defrosting mode is judged by utilizing two conditions of the temperature of the external coil and the current of the outdoor fan, so that the defrosting time of the air conditioner is judged more accurately.
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 this state is detected, when the continuous operation time is higher than a second 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 has been removed, and at this time, the air conditioner is exited from the defrosting mode.
The step of exiting the defrost mode of the present invention may also be: and detecting the real-time current value of the outdoor fan, and enabling the air conditioner to exit the defrosting mode when the current of the outdoor fan is equal to the second standard current value. Wherein the second standard current value is a current value of the outdoor fan in reverse rotation measured in a state where the outdoor unit is not frosted. And if the current of the outdoor fan is equal to the second standard current value, the defrosting mode of the air conditioner can be quitted.
In summary, the defrosting control method of the air conditioner of the present invention is mainly to control the outdoor fan to stop for a set time after the air conditioner enters the defrosting mode, and then control the outdoor fan to continuously reverse until the defrosting is completed. Because frost on the indoor and outdoor coil pipes is partially melted within a set time, the outdoor fan is controlled to rotate reversely, and a frost layer of the outdoor unit is blown off more easily and quickly in the defrosting process by utilizing the reverse blowing effect of the outdoor fan, so that the defrosting efficiency is 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.
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. A defrost control method for an air conditioner, said method comprising the steps of:
after the air conditioner enters a defrosting mode, controlling an outdoor fan to stop rotating;
and when the outdoor fan stops rotating for more than the set time, controlling the outdoor fan to continuously rotate reversely.
2. The defrosting control method of an air conditioner according to claim 1, wherein the setting time is any time between 110 and 130 seconds; or the set time is 120 seconds.
3. The air conditioner defrost control method of claim 2, wherein before the step of controlling the outdoor fan to stop rotating after the air conditioner enters the defrost mode, the method further comprises:
detecting the temperature of an external coil of the air conditioner;
when the temperature of the external coil is lower than the dew point 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 enter a defrosting mode.
4. The air conditioner defrost control method of claim 2, wherein before the step of controlling the outdoor fan to continuously reverse after the air conditioner enters the defrost mode, the method further comprises:
detecting a real-time current value of the outdoor fan;
calculating the ratio of the real-time current value of the outdoor fan to a first standard current value;
if the ratio is larger than a first preset value, enabling the air conditioner to enter a defrosting mode;
the first standard current value is a current value of positive rotation of the outdoor fan measured in a state that the outdoor unit is not frosted.
5. The air conditioner defrost control method of claim 2, wherein before the step of controlling the outdoor fan to continuously reverse after the air conditioner enters the defrost mode, the method further comprises:
detecting a real-time current value of the outdoor fan;
calculating the ratio of the real-time current value of the outdoor fan to a first standard current value;
if the ratio is larger than a first preset value, detecting the temperature of an outer coil of the air conditioner;
when the temperature of the external coil is lower than the dew point temperature, detecting the continuous operation time of the air conditioner in the state;
if the continuous operation time is higher than a first preset time, enabling the air conditioner to enter a defrosting mode;
the first standard current value is a current value of positive rotation of the outdoor fan measured in a state that the outdoor unit is not frosted.
6. The air conditioner defrost control method of claim 3 or 5, wherein the first preset time is any time between 35-45 minutes; or the first preset time is 40 minutes.
7. The air conditioner defrost control method of claim 4 or 5, wherein the first preset value is any value between 1.1-1.3; or the first preset value is 1.2.
8. The air conditioner defrost control method of any one of claims 1 to 5, wherein after the step of controlling the outdoor fan to continuously reverse after the outdoor fan stops rotating for more than a set time, the method further comprises:
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 second preset time, enabling the air conditioner to exit the defrosting mode.
9. The air conditioner defrost control method of claim 8, wherein the second preset time is any time between 15-25 seconds; or the second preset time is 20 seconds.
10. The air conditioner defrost control method of any one of claims 1 to 5, wherein after the step of controlling the outdoor fan to continuously reverse after the air conditioner enters the defrost mode, the method further comprises:
detecting a real-time current value of the outdoor fan;
when the real-time current value of the outdoor fan is equal to a second standard current value, enabling the air conditioner to exit a defrosting mode;
wherein the second standard current value is a current value of the outdoor fan in reverse rotation measured in a state where the outdoor unit is not frosted.
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| CN201810939463.2A CN110836439A (en) | 2018-08-17 | 2018-08-17 | Defrosting control method for air conditioner |
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| CN201810939463.2A CN110836439A (en) | 2018-08-17 | 2018-08-17 | Defrosting control method for air conditioner |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114738929A (en) * | 2022-04-01 | 2022-07-12 | 北京小米移动软件有限公司 | Air conditioner defrosting control method and device and storage medium |
| CN115289615A (en) * | 2022-08-04 | 2022-11-04 | 河南城建学院 | Automatic defrosting control method and system for air conditioner |
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| CN114738929A (en) * | 2022-04-01 | 2022-07-12 | 北京小米移动软件有限公司 | Air conditioner defrosting control method and device and storage medium |
| CN115289615A (en) * | 2022-08-04 | 2022-11-04 | 河南城建学院 | Automatic defrosting control method and system for air conditioner |
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