CN112484240B - Defrosting control method and device for air conditioner - Google Patents
Defrosting control method and device for air conditioner Download PDFInfo
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- CN112484240B CN112484240B CN202110092922.XA CN202110092922A CN112484240B CN 112484240 B CN112484240 B CN 112484240B CN 202110092922 A CN202110092922 A CN 202110092922A CN 112484240 B CN112484240 B CN 112484240B
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- temperature
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- air conditioner
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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
- F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
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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
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
- F24F11/871—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans
Abstract
The defrosting control method and the defrosting control device for the air conditioner can accurately judge the frosting degree of the outdoor heat exchanger when the air conditioner receives a shutdown signal, further judge whether defrosting is needed first and then shutdown is needed, completely avoid the possibility that the outdoor heat exchanger operates with frost when the air conditioner is started for heating next time, accumulate to cause poor heating effect, waste electric energy and damage to a compressor, simultaneously improve the heating effect, avoid electric energy waste and protect the safe operation of the air conditioner.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a defrosting control method and device for an air conditioner.
Background
When the air conditioner is in heating operation in winter and the outdoor environment temperature is low, the outdoor heat exchanger frosts to different degrees, so that the air conditioner can be automatically switched to a defrosting mode to melt the frost layer on the outdoor heat exchanger after a certain time interval. However, when the outdoor heat exchanger frosts seriously, but the air conditioner does not enter the defrosting mode, the air conditioner receives a shutdown signal, if the outdoor environment temperature is low, the frost layer on the outdoor heat exchanger cannot be melted automatically after shutdown, when the air conditioner is started for heating next time, because the frost layer is accumulated on the outdoor heat exchanger, the heating effect is poor, even because the frost layer is accumulated with higher speed, the later defrosting is not clean, the human body comfort is affected, and the electric energy is wasted, and the compressor can be started or a liquid refrigerant is sucked into the compressor in the running process to burn the compressor in serious cases.
At present, most air conditioners have no measures for solving the problems, the frosting degree of the outdoor heat exchanger before the air conditioner is shut down is judged by using the outlet temperature of the outdoor heat exchanger in the prior art, and then whether the air conditioner is shut down after defrosting is firstly carried out according to the frosting degree, and then the air conditioner is shut down.
Disclosure of Invention
The invention aims to provide a defrosting control method and a defrosting control device for an air conditioner, which are used for judging whether defrosting is carried out before shutdown according to different frosting degrees and the outdoor environment temperature, so that the problems of poor heating effect, electric energy waste and compressor damage caused by accumulated frost layers on an outdoor heat exchanger when the air conditioner is started for heating next time are avoided.
In order to achieve the above object, the present invention provides a defrosting control method for an air conditioner, comprising the steps of:
step S1: receiving a signal for turning off the air conditioner when the air conditioner operates in a heating mode;
step S2: obtaining the exhaust temperature Td1 and the return temperature Ts1 of the compressor at the moment before shutdown, and obtaining the minimum value Td0 and the minimum value Ts0 of the exhaust temperature of the compressor in the preset time after heating startup operation;
step S3: judging the relation of the minimum value Td0 of the compressor exhaust temperature minus the compressor exhaust temperature Td1 and a first preset parameter delta Td, and the relation of the minimum value Ts0 of the compressor return temperature minus the compressor return temperature Ts1 and a second preset parameter delta Ts, if the first condition or the second condition is met, performing step S4, and if the third condition or the fourth condition is met, performing step S6;
step S4: acquiring the outdoor environment temperature T before the air conditioner receives the shutdown signal, judging the size relation between the outdoor environment temperature T and a preset temperature value T0 according to the acquired outdoor environment temperature T and a preset temperature value T0, performing step S5 if a fifth condition is met, and performing step S6 if a sixth condition is met;
step S5: the air conditioner is switched to a defrosting mode to operate;
step S6: and controlling the air conditioner to shut down.
According to the invention, the preset time is any time between 1 and 15 minutes.
According to the invention, the preset temperature value is any temperature value between-2 ℃ and 4 ℃.
According to the invention, said first condition is that the minimum value Td0 of the compressor discharge temperature minus the compressor discharge temperature Td1 is greater than or equal to a first preset parameter Δ Td.
According to the invention, said second condition is that the minimum value of the compressor return air temperature Ts0 minus the compressor return air temperature Ts1 is greater than or equal to a second preset parameter Δ Ts.
According to the invention, said third condition is that the minimum value Td0 of the compressor discharge temperature minus the compressor discharge temperature Td1 is less than the first preset parameter Δ Td.
According to the invention, the fourth condition is that the minimum value Ts0 of the compressor return air temperature minus the compressor return air temperature Ts1 is less than the second predetermined parameter Δ Ts.
According to the present invention, the fifth condition is that the outdoor ambient temperature T is equal to or lower than a preset temperature value T0.
According to the present invention, the sixth condition is that the outdoor ambient temperature T is greater than a preset temperature value T0.
The invention also provides a defrosting control device of the air conditioner, which comprises the following components:
the air supply motor is used for driving the fan blades to rotate;
the fan blade is used for providing necessary air volume for the outdoor heat exchanger of the air conditioner;
the temperature detection module is used for detecting the outdoor environment temperature, the compressor exhaust temperature and the compressor return air temperature;
the storage module is used for storing the compressor exhaust temperature Td, the first preset parameter delta Td, the compressor return air temperature Ts, the second preset parameter delta Ts and the preset outdoor environment temperature comparison value T0 which are detected by the temperature detection module in real time;
and the central processing unit is used for judging the relation between the minimum value Td0 of the exhaust temperature of the compressor and the Td1 of the exhaust temperature of the compressor and a first preset parameter delta Td, and the relation between the minimum value Ts0 of the return temperature of the compressor and the return temperature Ts1 of the compressor and a second preset parameter delta Ts, and simultaneously judging the relation between the outdoor environment temperature T and a preset temperature value T0 and controlling the air conditioner. The defrosting control device of the air conditioner can execute the defrosting control method, can effectively select a corresponding mode through judging the defrosting condition, effectively improves the defrosting flexibility of the air conditioner, and reduces the frost layer on the outdoor heat exchanger before the air conditioner is shut down.
Compared with the prior art, the technical scheme of the invention has the advantages that the defrosting control method and the defrosting control device for the air conditioner can accurately judge the frosting degree of the outdoor heat exchanger when the air conditioner receives a shutdown signal, further judge whether defrosting is needed firstly and then shutdown is needed, completely avoid the possibility that the outdoor heat exchanger runs with frost when the air conditioner is started for heating next time, accumulate to cause poor heating effect, waste electric energy and damage to a compressor, simultaneously improve the heating effect, avoid electric energy waste and protect the safe running of the air conditioner.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of a defrost control method according to an embodiment of the present invention;
fig. 2 is a block diagram of a defrosting control apparatus according to an embodiment of the present invention.
Detailed Description
So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.
The terms "including" and "having," and any variations thereof, in the description and claims of embodiments of the present disclosure and the above-described drawings are intended to cover non-exclusive inclusions.
In the prior art, the frosting degree of the outdoor heat exchanger before the shutdown is judged by using the outlet temperature of the outdoor heat exchanger, although the frosting condition of the outdoor heat exchanger can be solved, certain air conditioners have no outlet temperature sensor of the outdoor heat exchanger, and the limitation of the use condition is obvious. The invention provides another new method for solving the problems, which can also accurately judge the frosting degree of the outdoor heat exchanger when the air conditioner receives a shutdown signal, further judge whether the air conditioner needs to be defrosted firstly and then shut down, completely avoid the frosted operation of the outdoor heat exchanger when the air conditioner is started for heating next time, improve the heating effect and protect the safe operation of the air conditioner.
The invention provides a defrosting control method of an air conditioner, which comprises the following steps as shown in figure 1:
step S1: receiving a signal for turning off the air conditioner when the air conditioner operates in a heating mode;
step S2: obtaining the exhaust temperature Td1 and the return temperature Ts1 of the compressor at the moment before shutdown, and obtaining the minimum value Td0 and the minimum value Ts0 of the exhaust temperature of the compressor in the preset time after heating startup operation;
step S3: judging the relation of the minimum value Td0 of the compressor exhaust temperature minus the compressor exhaust temperature Td1 and a first preset parameter delta Td, and the relation of the minimum value Ts0 of the compressor return temperature minus the compressor return temperature Ts1 and a second preset parameter delta Ts, if the first condition or the second condition is met, performing step S4, and if the third condition or the fourth condition is met, performing step S6;
step S4: acquiring the outdoor environment temperature T before the air conditioner receives the shutdown signal, judging the size relation between the outdoor environment temperature T and a preset temperature value T0 according to the acquired outdoor environment temperature T and a preset temperature value T0, performing step S5 if a fifth condition is met, and performing step S6 if a sixth condition is met;
step S5: the air conditioner is switched to a defrosting mode to operate;
step S6: and controlling the air conditioner to shut down.
The method obtains the exhaust temperature of the compressor and the return temperature of the compressor at the moment before the air conditioner is shut down by acquiring the exhaust temperature and the return temperature of the compressor before the air conditioner receives the shutdown signal, and obtaining the minimum value of the exhaust temperature of the compressor and the minimum value of the return temperature of the compressor in the preset time after the heating startup operation, judging the relationship between the minimum value of the compressor exhaust temperature and a first preset parameter according to the acquired data, and the minimum value of the return air temperature of the compressor and the relationship between the return air temperature of the compressor and a second preset parameter, so as to visually reflect the frosting degree of the outdoor heat exchanger, and further through the relationship between the outdoor environment temperature and the preset temperature value, whether the defrosting mode needs to be started or not can be judged more accurately according to the outdoor environment temperature, and therefore the situation that the outdoor heat exchanger operates with frost when the machine is started for heating next time is avoided.
Specifically, the preset time is any time between 1 and 15 minutes.
Specifically, the preset temperature value is any temperature value between-2 ℃ and 4 ℃.
Specifically, the first condition is that the minimum value Td0 of the compressor discharge temperature minus the compressor discharge temperature Td1 is greater than or equal to the first preset parameter Δ Td.
Specifically, the second condition is that the minimum value Ts0 of the return air temperature of the compressor minus the return air temperature Ts1 of the compressor is greater than or equal to a second preset parameter Δ Ts.
Specifically, the third condition is that the minimum value Td0 of the compressor discharge temperature minus the compressor discharge temperature Td1 is less than the first preset parameter Δ Td.
Specifically, the fourth condition is that the minimum value Ts0 of the return air temperature of the compressor minus the return air temperature Ts1 is smaller than the second preset parameter Δ Ts.
Specifically, the fifth condition is that the outdoor environment temperature T is less than or equal to a preset temperature value T0.
Specifically, the sixth condition is that the outdoor ambient temperature T is greater than a preset temperature value T0.
In another aspect, referring to fig. 2, the present invention further provides a defrosting control device for an air conditioner, including:
the air supply motor is used for driving the fan blades to rotate;
the fan blade is used for providing necessary air volume for the outdoor heat exchanger of the air conditioner;
the temperature detection module is used for detecting the outdoor environment temperature, the compressor exhaust temperature and the compressor return air temperature;
the storage module is used for storing the compressor exhaust temperature Td, the first preset parameter delta Td, the compressor return air temperature Ts, the second preset parameter delta Ts and the preset outdoor environment temperature comparison value T0 which are detected by the temperature detection module in real time;
and the central processing unit is used for judging the relation between the minimum value Td0 of the exhaust temperature of the compressor and the Td1 of the exhaust temperature of the compressor and a first preset parameter delta Td, and the relation between the minimum value Ts0 of the return temperature of the compressor and the return temperature Ts1 of the compressor and a second preset parameter delta Ts, and simultaneously judging the relation between the outdoor environment temperature T and a preset temperature value T0 and controlling the air conditioner.
The defrosting control device of the air conditioner can execute the defrosting control method, can effectively select the corresponding mode according to the judgment on the defrosting condition, effectively improves the defrosting flexibility of the air conditioner, reduces the frost layer on the outdoor heat exchanger before the air conditioner is turned off, completely avoids the operation of the outdoor heat exchanger with frost when the air conditioner is turned on and heated next time, improves the use comfort of users, improves the heating effect, avoids electric energy waste and also protects the safe operation of the air conditioner.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (4)
1. The defrosting control method of the air conditioner is characterized by comprising the following steps:
step S1: receiving a signal for turning off the air conditioner when the air conditioner operates in a heating mode;
step S2: obtaining the exhaust temperature Td1 and the return temperature Ts1 of the compressor at the moment before shutdown, and obtaining the minimum value Td0 and the minimum value Ts0 of the exhaust temperature of the compressor in the preset time after heating startup operation;
step S3: judging the relation of the minimum value Td0 of the compressor exhaust temperature minus the compressor exhaust temperature Td1 and a first preset parameter delta Td, and the relation of the minimum value Ts0 of the compressor return temperature minus the compressor return temperature Ts1 and a second preset parameter delta Ts, if the first condition or the second condition is met, performing step S4, and if the third condition or the fourth condition is met, performing step S6;
step S4: acquiring the outdoor environment temperature T before the air conditioner receives the shutdown signal, judging the size relation between the outdoor environment temperature T and a preset temperature value T0 according to the acquired outdoor environment temperature T and a preset temperature value T0, performing step S5 if a fifth condition is met, and performing step S6 if a sixth condition is met;
step S5: the air conditioner is switched to a defrosting mode to operate;
step S6: controlling the air conditioner to shut down;
wherein the first condition is that the minimum value of the compressor discharge temperature Td0 minus the compressor discharge temperature Td1 is greater than or equal to a first preset parameter Δ Td; the second condition is that the minimum value Ts0 of the return air temperature of the compressor minus the return air temperature Ts1 of the compressor is greater than or equal to a second preset parameter delta Ts; the third condition is that the minimum value Td0 of the compressor discharge temperature minus the compressor discharge temperature Td1 is less than the first preset parameter Δ Td; the fourth condition is that the minimum value Ts0 of the return air temperature of the compressor minus the return air temperature Ts1 of the compressor is smaller than a second preset parameter delta Ts; the fifth condition is that the outdoor environment temperature T is less than or equal to a preset temperature value T0; the sixth condition is that the outdoor ambient temperature T is greater than a preset temperature value T0.
2. The defrosting control method of an air conditioner according to claim 1, wherein the preset time is any time between 1 and 15 minutes.
3. The defrosting control method of an air conditioner according to claim 1, wherein the preset temperature value is any temperature value between-2 ℃ and 4 ℃.
4. An apparatus implementing the control method according to any one of claims 1 to 3, characterized by comprising:
the air supply motor is used for driving the fan blades to rotate;
the fan blade is used for providing necessary air volume for the outdoor heat exchanger of the air conditioner;
the temperature detection module is used for detecting the outdoor environment temperature, the compressor exhaust temperature and the compressor return air temperature;
the storage module is used for storing the compressor exhaust temperature Td, the first preset parameter delta Td, the compressor return air temperature Ts, the second preset parameter delta Ts and the preset outdoor environment temperature comparison value T0 which are detected by the temperature detection module in real time;
and the central processing unit is used for judging the relation between the minimum value Td0 of the exhaust temperature of the compressor and the Td1 of the exhaust temperature of the compressor and a first preset parameter delta Td, and the relation between the minimum value Ts0 of the return temperature of the compressor and the return temperature Ts1 of the compressor and a second preset parameter delta Ts, and simultaneously judging the relation between the outdoor environment temperature T and a preset temperature value T0 and controlling the air conditioner.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110092922.XA CN112484240B (en) | 2021-01-25 | 2021-01-25 | Defrosting control method and device for air conditioner |
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| CN202110092922.XA CN112484240B (en) | 2021-01-25 | 2021-01-25 | Defrosting control method and device for air conditioner |
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| CN112484240B true CN112484240B (en) | 2021-11-23 |
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| CN112923517A (en) * | 2021-03-24 | 2021-06-08 | 广东积微科技有限公司 | Air conditioner defrosting control method and air conditioner |
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| KR101211007B1 (en) * | 2005-12-22 | 2012-12-11 | 엘지전자 주식회사 | Air conditioning of Thermo defrost the operation method |
| CN104633871B (en) * | 2013-11-14 | 2017-07-25 | 珠海格力电器股份有限公司 | The control method of air-conditioning system |
| CN109114748A (en) * | 2018-08-20 | 2019-01-01 | 宁波奥克斯电气股份有限公司 | A kind of air-conditioning delays frosting control method, device and air conditioner |
| CN109631236A (en) * | 2018-12-14 | 2019-04-16 | 广东Tcl智能暖通设备有限公司 | Multi-connected air conditioner device and its Defrost method |
| US11125482B2 (en) * | 2019-05-31 | 2021-09-21 | Trane International Inc. | Lubricant quality management for a compressor |
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