CN111895606B - Anti-freezing control method and air conditioner - Google Patents
Anti-freezing control method and air conditioner Download PDFInfo
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- CN111895606B CN111895606B CN202010784998.4A CN202010784998A CN111895606B CN 111895606 B CN111895606 B CN 111895606B CN 202010784998 A CN202010784998 A CN 202010784998A CN 111895606 B CN111895606 B CN 111895606B
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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
- F24F11/43—Defrosting; Preventing freezing of indoor 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
- F24F11/62—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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- General Engineering & Computer Science (AREA)
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- Air-Conditioning For Vehicles (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an anti-freezing control method and an air conditioner, which comprise the following steps: in the refrigeration or dehumidification mode, when the tube temperature of the indoor heat exchanger is less than or equal to a first preset anti-freezing temperature and lasts for a first preset time; and judging whether the tube temperature of the indoor heat exchanger is greater than or equal to a second preset anti-freezing temperature within a preset time, if so, starting anti-freezing protection, and if not, controlling the normal operation of the air conditioner. According to the invention, when the evaporator has refrigerant bias flow, the air conditioner is controlled to start the anti-freezing protection mode, so that the air conditioning unit can enter anti-freezing protection in time, and the reliability quality problem of incomplete defrosting caused by excessive frosting is avoided.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an anti-freezing control method and an air conditioner.
Background
When the air conditioner is used for refrigerating at low temperature, the temperature of the evaporator of the internal machine is low. When the evaporator temperature is below the freezing point temperature of the environment, the fins begin to frost continuously. The evaporator frosts, which affects the cooling effect of the air conditioner, and if frosting too much, the reliability problem occurs. At present, the air conditioner can solve frosting and defrosting through an anti-freezing function, and the evaporator can be ensured to enter into anti-freezing in time under the condition of acceptable frosting, so that the frosting of the evaporator is completely removed. The anti-freezing function is realized by mainly detecting the temperature of the inner pipe, and if the temperature is reduced to a certain set value and is maintained to be less than or equal to the set value for a certain time, the unit enters anti-freezing protection.
However, when the air conditioner is operated under some special conditions, such as high humidity or low rotation speed of the internal machine, the evaporator is frosted very quickly, and at this time, the unit may not have access to the anti-freezing protection. In this case, different frosting degrees are caused by different heat exchange of each branch of the evaporator. When the evaporator frosts and does not enter the frost prevention and protection for defrosting in time, the pressure of each branch is different due to different temperatures of the branches. The refrigerant in the system is also gradually deflected to a low-pressure part, the frost forming part is thicker and thicker, and the frost-free part is overheated. This is the difference in the degree of frost formation of each branch passage caused by the bias flow of the refrigerant.
The temperature positions of most evaporator tubes are determined mainly under the condition that each branch flow path is normally divided according to related data, so that the refrigerant can flow in a bias mode under specific conditions, but the temperature positions of the evaporator tubes are located at overheating positions, the phenomenon that the evaporator is frosted too much, and a unit cannot normally and timely enter anti-freezing protection is caused.
Disclosure of Invention
The invention provides an anti-freezing control method and an air conditioner, aiming at solving the technical problem that an air conditioning unit cannot enter into anti-freezing protection in time due to bias flow of a refrigerant in the prior art.
The technical scheme adopted by the invention is as follows:
the invention provides an anti-freezing control method, which comprises the following steps:
in the refrigeration or dehumidification mode, when the tube temperature of the indoor heat exchanger is less than or equal to a first preset anti-freezing temperature and lasts for a first preset time;
and judging whether the tube temperature of the indoor heat exchanger is greater than or equal to a second preset anti-freezing temperature within a preset time, if so, starting anti-freezing protection, and if not, controlling the normal operation of the air conditioner.
When the tube temperature of the indoor heat exchanger is less than or equal to a first preset anti-freezing temperature and lasts for a first preset time length, judging whether the tube temperature of the indoor heat exchanger is less than or equal to the preset anti-freezing temperature; if yes, starting anti-freezing protection; and if not, continuing to judge whether the tube temperature of the indoor heat exchanger is greater than or equal to the second preset anti-freezing junction temperature.
Further, when the tube temperature of the indoor heat exchanger is less than or equal to a preset anti-freezing junction temperature, judging whether the tube temperature lasts for a third preset time; if yes, starting anti-freezing protection; and if not, continuing to judge whether the tube temperature of the indoor heat exchanger is greater than or equal to the second preset anti-freezing junction temperature.
And when the temperature of the pipe of the indoor heat exchanger is greater than or equal to a second preset anti-freezing temperature, judging whether the second preset time duration lasts or not, if so, starting anti-freezing protection, and if not, controlling the normal operation of the air conditioner.
And in the refrigeration or dehumidification mode, after the compressor is started for a fourth preset time, starting to judge the tube temperature of the indoor heat exchanger.
And when in a refrigeration or dehumidification mode, judging whether the tube temperature of the indoor heat exchanger is less than or equal to a first preset anti-freezing temperature and lasts for a first preset time, and if not, controlling the normal operation of the air conditioner.
Further, the preset anti-freezing temperature is less than a first preset anti-freezing temperature, and the first preset anti-freezing temperature is less than a second preset anti-freezing temperature.
An air conditioner is characterized in that the anti-freezing control method is used for controlling the air conditioner to enter anti-freezing protection in time.
Compared with the prior art, the invention can control the air conditioner to start the anti-freezing protection mode when the refrigerant of the evaporator flows in a bias manner, so that the air conditioning unit can enter the anti-freezing protection mode in time, thereby avoiding the reliability and quality problem of incomplete defrosting caused by excessive frosting.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a flow chart in an embodiment of the invention;
FIG. 2 is a schematic diagram illustrating a temperature change of a tube when a refrigerant drifts.
Presetting an anti-freezing temperature T; a first preset anti-freezing temperature T1; a second predetermined antifreeze junction temperature T2.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The principles and construction of the present invention will be described in detail below with reference to the drawings and examples.
And the air conditioning unit normally operates in a refrigeration or dehumidification mode. When the air conditioning unit normally frosts, the temperature of the inner pipe of the evaporator decreases with time. In the process of lowering, because the refrigerant begins to drift along the evaporator flow path, the temperature of the inner pipe is just above the branch of overheating, and the temperature of the inner pipe detected by the temperature sensor of the air conditioner begins to rise due to overheating. After a long period of time, when the evaporator frosts enough and the frosting area is large enough, the temperature of the inner pipe can be reduced to the preset anti-freezing protection temperature.
As shown in fig. 1, the present invention provides an anti-freezing control method, which includes the steps of:
step 1, starting an air conditioner, operating a refrigeration or dehumidification mode, and starting to detect the pipe temperature of an indoor heat exchanger after a compressor is started for a fourth preset time;
step 2, judging whether the tube temperature of the indoor heat exchanger (namely an evaporator) is less than or equal to a first preset anti-freezing temperature and lasting for a first preset time, if so, executing step 3, and if not, controlling the unit to normally operate;
step 3, judging whether the tube temperature of the indoor heat exchanger is less than or equal to a preset anti-freezing temperature within a preset time period and continuing for a third preset time period; if yes, starting anti-freezing protection; if not, executing the step 4;
and 4, judging whether the pipe temperature of the indoor heat exchanger is greater than or equal to a second preset anti-freezing temperature or not, and continuing for a second preset time, if so, indicating that the temperature of the inner pipe detected by the temperature sensor of the air conditioner begins to rise due to overheating because of bias flow of the refrigerant, controlling the air conditioner to start anti-freezing protection, and if not, indicating that bias flow of the refrigerant does not occur, and operating the air conditioning unit according to an original control program. According to the invention, when the evaporator has refrigerant bias flow, the air conditioner is controlled to start the anti-freezing protection mode, so that the air conditioning unit can enter anti-freezing protection in time, and the reliability quality problem of incomplete defrosting caused by excessive frosting is avoided.
In the invention, the relation among the preset anti-freezing temperature T, the first preset anti-freezing junction temperature T1 and the second preset anti-freezing junction temperature T2 is that T is more than T1 and more than T2, and the specific values of the three parameters need to be formulated by combining the actual conditions of the air conditioning unit so as to avoid the phenomenon of error protection.
Under an ideal state, when the air conditioning unit operates to the time I, the temperature of the pipe is close to T, the air conditioner enters anti-freezing protection, and the air conditioner starts to stop to defrost, namely the air conditioner can reach the anti-freezing condition within a short operating time, and the air conditioner can enter anti-freezing protection according to the conventional anti-freezing logic.
As shown in fig. 2, in an actual process, a refrigerant bias flow exists, and for example, according to a conventional anti-freezing logic, the refrigerant bias flow needs to be operated to the time iii (for a certain time, the time is shorter) to enter anti-freezing protection; according to the anti-freezing logic of the invention, the hot anti-freezing protection can be carried out only by running for a certain time (a certain time is continued again, and the time is shorter). The abnormal frosting condition in the time period from II to III can be avoided, the unit can enter the anti-freezing protection in time, and the reliability and quality problem that frosting is not clean due to excessive frosting is avoided.
The invention also provides an air conditioner, and the anti-freezing control method is used for controlling the air conditioner to enter anti-freezing protection in time.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. An anti-freezing control method is characterized by comprising the following steps:
in the refrigeration or dehumidification mode, when the tube temperature of the indoor heat exchanger is less than or equal to a first preset anti-freezing temperature and lasts for a first preset time;
judging whether the tube temperature of the indoor heat exchanger is greater than or equal to a second preset anti-freezing junction temperature within a preset time length; if yes, anti-freezing protection is started, and if not, the air conditioner is controlled to normally operate.
2. The freezing prevention control method according to claim 1, wherein when the tube temperature of the indoor heat exchanger is less than or equal to a first preset freezing prevention temperature for a first preset duration, it is first determined whether the tube temperature of the indoor heat exchanger is less than or equal to the preset freezing prevention junction temperature; and if so, starting anti-freezing protection, and if not, judging whether the tube temperature of the indoor heat exchanger is greater than or equal to a second preset anti-freezing temperature within a preset time period.
3. The antifreeze control method according to claim 2, wherein when the tube temperature of the indoor heat exchanger is less than or equal to a preset antifreeze temperature, it is determined whether or not to continue for a third preset time period; if yes, starting anti-freezing protection; and if not, continuously judging whether the tube temperature of the indoor heat exchanger is greater than or equal to a second preset anti-freezing junction temperature within a preset time.
4. The freezing prevention control method according to claim 1, wherein when the tube temperature of the indoor heat exchanger is greater than or equal to a second preset freezing prevention temperature within a preset time period, judging whether the second preset time period lasts, if so, starting freezing prevention protection, and if not, controlling the normal operation of the air conditioner.
5. The freezing prevention control method according to claim 1, wherein the step of judging the tube temperature of the indoor heat exchanger is started again after the compressor is started for a fourth preset time period in the cooling or dehumidifying mode.
6. The freezing prevention control method according to claim 1, wherein in the cooling or dehumidifying mode, it is determined whether the tube temperature of the indoor heat exchanger is less than or equal to a first predetermined freezing prevention temperature for a first predetermined time period, and if not, the normal operation of the air conditioner is controlled.
7. The method of claim 2, wherein the predetermined freeze protection junction temperature is less than a first predetermined freeze protection junction temperature.
8. The method of claim 7, wherein the first predetermined freeze protection junction temperature is less than the second predetermined freeze protection junction temperature.
9. An air conditioner is characterized in that the anti-freezing control method of any one of claims 1 to 8 is used for controlling the air conditioner to enter anti-freezing protection in time.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010784998.4A CN111895606B (en) | 2020-08-06 | 2020-08-06 | Anti-freezing control method and air conditioner |
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| CN202010784998.4A CN111895606B (en) | 2020-08-06 | 2020-08-06 | Anti-freezing control method and air conditioner |
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| CN111895606B true CN111895606B (en) | 2021-05-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112524748B (en) * | 2020-12-09 | 2022-03-15 | 珠海格力电器股份有限公司 | Air conditioner operation control method, device, equipment and storage medium |
| CN113483460B (en) * | 2021-07-09 | 2022-09-16 | 珠海格力电器股份有限公司 | Control method and device for preventing air conditioning equipment from freezing |
| CN114413436A (en) * | 2022-01-10 | 2022-04-29 | 宁波奥克斯电气股份有限公司 | Defrosting control method and device for air conditioner internal unit and air conditioner |
| CN114608145B (en) * | 2022-02-24 | 2024-02-20 | 青岛海尔空调器有限总公司 | Control method and control device for air conditioner, air conditioner and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH01302056A (en) * | 1988-05-31 | 1989-12-06 | Toshiba Corp | Air conditioner |
| JP2012167861A (en) * | 2011-02-14 | 2012-09-06 | Hitachi Appliances Inc | Plate type heat exchanger |
| CN105091435B (en) * | 2014-05-13 | 2018-09-18 | 珠海格力电器股份有限公司 | Defrosting control method |
| JP6965736B2 (en) * | 2017-12-27 | 2021-11-10 | 株式会社富士通ゼネラル | Air conditioner |
| CN110631205A (en) * | 2018-06-25 | 2019-12-31 | 青岛海尔空调器有限总公司 | Defrosting control method and device for air conditioner |
| CN110332652B (en) * | 2019-07-25 | 2021-04-09 | 宁波奥克斯电气股份有限公司 | Defrosting control method and device and air conditioner |
| CN110594991B (en) * | 2019-08-30 | 2021-08-31 | 青岛海尔空调器有限总公司 | Heating bias flow control method and system for multi-split air conditioner and multi-split air conditioner system |
| CN111397097B (en) * | 2020-04-03 | 2022-12-27 | 青岛海尔空调电子有限公司 | Defrosting control method for air conditioner and air conditioner |
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