CN107166639B - Air conditioner defrosting control method and control device and air conditioner - Google Patents
Air conditioner defrosting control method and control device and air conditioner Download PDFInfo
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- CN107166639B CN107166639B CN201710324921.7A CN201710324921A CN107166639B CN 107166639 B CN107166639 B CN 107166639B CN 201710324921 A CN201710324921 A CN 201710324921A CN 107166639 B CN107166639 B CN 107166639B
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
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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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
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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
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
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- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a defrosting control method of an air conditioner, which comprises the following steps: when the outdoor environment temperature is higher than 0 ℃ and lower than 5 ℃, the air conditioner works in a heating mode to judge whether the defrosting condition is met; if the defrosting condition is met, the air conditioner enters a defrosting mode, wherein the defrosting mode is to control the frequency of a compressor to be defrosting frequency and control the opening of an electronic expansion valve to be defrosting opening, so that the surface temperature of the outdoor heat exchanger is maintained at 0 ℃; the defrosting frequency is lower than the real-time running frequency of the compressor in the heating mode, and the defrosting opening is larger than the real-time opening of the electronic expansion valve in the heating mode; the air conditioner keeps operating in the defrosting mode until it is determined that the exit condition is satisfied. Simultaneously, the defrosting control device of the air conditioner and the air conditioner are also disclosed. According to the invention, the defrosting mode and the heating mode do not need to be switched during defrosting, and the air heat is utilized to defrost, so that the defrosting method has the advantages of low energy consumption and good user experience.
Description
Technical Field
The invention relates to the technical field of air conditioning, in particular to an air conditioner defrosting control method, an air conditioner defrosting control device and an air conditioner.
Background
When the moisture contained in the air contacts the heat transfer surface with the temperature lower than the triple point of the water, the moisture adheres to the heat transfer surface to form frost. The frost layer is formed by mixing ice and air, and according to the research of the prior art, the frost layer on the surface of the heat exchanger can increase heat transfer resistance and flow resistance under the frosting condition. When the air conditioner is used in winter and works in a heating condition, because the outside air temperature is very low, if the air humidity reaches a certain degree, the heat exchange surface of the outdoor heat exchanger of the air conditioner is very easy to frost, and the heat exchange efficiency and the service life of the air conditioner are further seriously influenced.
The main control method for defrosting of the air conditioner in the prior art is that after the thickness of a frost layer reaches a certain degree, the air conditioner is controlled by a control system to stop heating operation, the working state of a four-way valve is adjusted, the air conditioner is enabled to operate in a refrigerating state in a short time, a refrigerant with higher temperature flows through an outdoor heat exchanger, the surface temperature of a heat transfer surface of the outdoor heat exchanger is increased, the frost layer is melted, and the frost layer is converted into heating operation again after being melted.
The air conditioner defrosting operation of prior art, at the in-process of defrosting, because the air conditioner short time operation is in the mode of refrigerating, indoor air supply temperature can obviously reduce, leads to the deviation increase between settlement temperature and the ambient temperature, increases the whole load of equipment, also can influence user's actual experience to a certain extent simultaneously.
Disclosure of Invention
The invention provides a defrosting control method of an air conditioner, which is used for solving the problems that the air conditioner needs to operate in a refrigerating mode in a short time and the indoor air supply temperature is obviously reduced during defrosting operation in the prior art.
The defrosting control method of the air conditioner is characterized by comprising the following steps:
when the outdoor environment temperature is higher than 0 ℃ and lower than 5 ℃, the air conditioner works in a heating mode to judge whether the defrosting condition is met;
if the defrosting condition is met, the air conditioner enters a defrosting mode, wherein the defrosting mode is to control the frequency of a compressor to be defrosting frequency and control the opening of an electronic expansion valve to be defrosting opening, so that the surface temperature of the outdoor heat exchanger is maintained at 0 ℃;
the defrosting frequency is lower than the real-time running frequency of the compressor in the heating mode, and the defrosting opening is larger than the real-time opening of the electronic expansion valve in the heating mode;
the air conditioner keeps operating in the defrosting mode until it is determined that the exit condition is satisfied.
In order to solve the problem that the heat of outdoor air is not enough to completely defrost when a time factor is taken as an exit condition, the defrosting mode further comprises the step of controlling the rotating speed of an outdoor fan to be a first defrosting rotating speed, and the rotating speed of an indoor fan to be a second defrosting rotating speed, wherein the first defrosting rotating speed is larger than the real-time operating rotating speed of the outdoor fan in the heating mode, and the second defrosting rotating speed is smaller than the real-time operating rotating speed of the indoor fan in the heating mode.
Preferably, the defrosting frequency is 40Hz, and the defrosting opening is adjusted to the maximum opening by the electronic expansion valve.
Preferably, the first defrosting rotation speed is that the outdoor fan works at the highest rotation speed, and the second defrosting rotation speed is that the indoor fan works at the lowest rotation speed.
Further, the defrost condition includes a first defrost condition and a second defrost condition:
the first defrosting condition is that the air conditioner is started, the compressor works according to the heating mode, the accumulated work meets a first period, and the first continuous operation of the compressor meets a first time interval, so that the first defrosting condition is met;
after the first defrosting condition is met, the air conditioner operates according to a defrosting mode for the first time;
the second defrosting condition is that when the air conditioner operates according to the defrosting mode until the air conditioner exits after meeting the exit condition, the air conditioner operates according to the heating mode to accumulate to meet a second period, the compressor continuously operates for a first period, and the time interval between the air conditioner and the first time of operation according to the defrosting mode or the last time of operation according to the defrosting mode is greater than a second period, the second defrosting condition is met; and after the second defrosting condition is met, the air conditioner operates according to the defrosting mode again.
Further, the exit condition includes at least one of:
the surface temperature of the outdoor heat exchanger is greater than the first exit temperature for a third continuous period of time;
or, the surface temperature of the outdoor heat exchanger is greater than the second exit temperature for a fourth period of time;
or, the air conditioner continuously operates for a fifth time period according to the defrosting mode;
wherein the first exit temperature is less than the second exit temperature.
Preferably, the defrosting mode further comprises controlling the outdoor electric heater to be maintained in an operation state.
The defrosting control method of the air conditioner disclosed by the invention does not need to switch between the heating mode and the cooling mode during defrosting, the system pressure can be kept approximately stable, and compared with the prior art, the waiting time for stabilizing the system pressure is saved, so that the proportion of the defrosting mode in the whole air conditioner running time is shortened.
Also disclosed simultaneously is an air conditioner defrosting control device including:
the first judging unit is used for judging whether the running working condition of the air conditioner meets the defrosting condition or not when the outdoor environment temperature is higher than 0 ℃ and lower than 5 ℃;
the processing unit is used for controlling the air conditioner to enter a defrosting mode when the operating condition of the air conditioner meets a defrosting condition, outputting a first control signal to control the frequency of the compressor to be defrosting frequency, and outputting a second control signal to control the opening of the electronic expansion valve to be defrosting opening, so that the surface temperature of the outdoor heat exchanger is reduced and maintained at 0 ℃; the defrosting frequency is lower than the real-time running frequency of the compressor in the heating mode, and the defrosting opening is larger than the real-time opening of the electronic expansion valve in the heating mode;
the second judging unit is used for judging whether the defrosting operation working condition of the air conditioner meets an exit condition or not;
and the switching unit is used for outputting an exit control signal to control the air conditioner to exit the defrosting mode and operate according to the set heating mode when the defrosting operation condition of the air conditioner meets the exit condition.
Further, when the heating operation condition of the air conditioner meets the defrosting condition, the processing unit simultaneously outputs a third control signal to control the rotating speed of the outdoor fan to be a first defrosting rotating speed and control the rotating speed of the indoor fan to be a second defrosting rotating speed, wherein the first defrosting rotating speed is greater than the real-time rotating speed of the outdoor fan in the heating mode, and the rotating speed of the indoor fan is less than the real-time rotating speed of the indoor fan in the heating mode.
The defrosting control device of the air conditioner disclosed by the invention has the advantages of high defrosting control precision and no need of stopping the compressor.
Simultaneously, disclose an air conditioner, including air conditioner defrosting controlling means, air conditioner defrosting controlling means includes:
the first judging unit is used for judging whether the heating operation working condition of the air conditioner meets the defrosting condition or not when the outdoor environment temperature is higher than 0 ℃ and lower than 5 ℃;
the processing unit is used for controlling the air conditioner to enter a defrosting mode when the operating condition of the air conditioner meets a defrosting condition, outputting a first control signal to control the frequency of the compressor to be defrosting frequency, and outputting a second control signal to control the opening of the electronic expansion valve to be defrosting opening, so that the surface temperature of the outdoor heat exchanger is reduced and maintained at 0 ℃; the defrosting frequency is lower than the real-time running frequency of the compressor in the heating mode, and the defrosting opening is larger than the real-time opening of the electronic expansion valve in the heating mode;
the second judging unit is used for judging whether the operating condition of the air conditioner meets the quitting condition or not;
and the switching unit is used for outputting an exit control signal to control the air conditioner to exit the defrosting mode and operate according to the set heating mode when the defrosting operation condition of the air conditioner meets the exit condition.
The air conditioner disclosed by the invention has the advantages of low energy consumption and good user experience.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flowchart illustrating an embodiment of a defrosting control method for an air conditioner according to the present invention;
FIG. 2 is a flowchart illustrating an embodiment of a defrosting control method for an air conditioner according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
When the outdoor temperature is lower than 10 ℃, a person usually starts the air conditioner indoors and causes the air conditioner to operate in a heating mode to increase the indoor temperature. When the air conditioner works in a heating mode, the surface temperature of the outdoor heat exchanger is lower than the dew point temperature of the outdoor air, and moisture in the outdoor air is condensed on the surface of the outdoor heat exchanger. It is found through experiments that when the outdoor ambient temperature is less than 5 ℃, the surface of the outdoor heat exchanger begins to frost, and the outdoor ambient temperature is more serious than 0 ℃ and less than 5 ℃. When the outdoor ambient temperature is less than 0 ℃, moisture in the air is reduced, and the growth of the frost layer condensed on the surface of the outdoor heat exchanger becomes slow or even stagnates. The first embodiment disclosed in the present invention is intended to solve this problem while maintaining the operation of the compressor when the outdoor ambient temperature is higher than 0 ℃ and lower than 5 ℃.
Specifically, referring to fig. 1, the defrosting control method for an air conditioner provided by the present embodiment includes the following steps:
when the outdoor environment temperature is higher than 0 ℃ and lower than 5 ℃, the air conditioner works in a heating mode according to the setting of a user, and a controller of the air conditioner starts to judge whether the defrosting condition is met. When the air conditioner is just started, the room temperature is greatly different from the set temperature, the heating mode preferably controls the high-frequency operation of the compressor and ensures that the compressor is not frequently started and stopped within a period of time, and the air conditioner enables the room temperature to quickly reach the set value by the mode, so that the discomfort is reduced. After working for a period of time according to the heating mode, frost layers appear on the surfaces of the outdoor heat exchangers, when the frost layers increase to a certain thickness, the heat exchange amount is rapidly reduced, the evaporation pressure and the evaporation temperature of the corresponding units start to be reduced in an accelerated manner, and the temperature and the pressure of the indoor coil start to be reduced while the pressure and the temperature of the outdoor coil are reduced. In order to reduce the effect of frost on the temperature and pressure of the coil, in this embodiment, two time factors are preferably selected as the conditions for controlling the start of the defrost mode, i.e., the cumulative operating time of the compressor in the heating mode and the first continuous operating time of the compressor. And when the accumulated working time of the compressor according to the heating mode meets a first period and the first continuous running time of the compressor meets a first time interval, determining that the air conditioner meets a first defrosting condition and starting defrosting. The duration of the first period may be set to 30 minutes to 60 minutes, the first period is preferably set to 1 minute, and the specific duration may be adjusted according to the capacity and model of the air conditioner, which is not further limited herein.
After entering the defrosting mode, firstly controlling the frequency of the compressor as the defrosting frequency and simultaneously controlling the opening of the electronic expansion valve as the defrosting opening, wherein the defrosting frequency is lower than the real-time running frequency of the compressor in the heating mode, and the defrosting opening is larger than the real-time opening of the electronic expansion valve in the heating mode, so that the flow of the refrigerant is improved, the surface temperature of the outdoor heat exchanger reaches 0 ℃ in a short time, the temperature of a heat transfer surface is equal to or higher than the phase change temperature point of water, and the growth of a frost layer is hindered. Meanwhile, because the outdoor temperature is higher than 0 ℃, the frost layer on the surface of the outdoor heat exchanger exchanges heat with the air to absorb the heat energy in the air, the frost layer on the surface of the outdoor heat exchanger begins to melt, and the temperature and the pressure of the outdoor heat exchanger can accelerate to rise in the later defrosting period. In order to make the surface temperature of the outdoor heat exchanger reach 0 c in a short time, it is preferable that in the defrosting mode, the defrosting frequency of the compressor is reduced to about 40Hz while the defrosting opening degree of the electronic expansion valve is made the maximum opening degree.
In the whole defrosting mode process, the air conditioner continuously judges whether the exit condition is met, and when the exit condition is met, the air conditioner exits the defrosting mode and recovers the running of the heating module. However, in order to maintain the compressor in the defrosting mode and to operate the compressor smoothly, it is generally preferable to start the determination after operating the compressor in the defrosting mode for 2 minutes. In this embodiment, the exit condition may be set in various ways, the first way uses a combination of a time factor and a temperature factor as the exit condition, and usually the surface temperature of the outdoor heat exchanger is continuously greater than the first exit temperature for a third period of time, or the surface temperature of the outdoor heat exchanger is continuously greater than the second exit temperature for a fourth period of time. Preferably the third period of time is 60s and the fourth period of time is 20s, the first exit temperature being less than the second exit temperature. It is understood that both the first exit temperature and the second exit temperature are above 0 ℃. The second is to use a time factor as an exit condition, preferably when the air conditioner is continuously operated in the defrost mode for a fifth period of time, preferably 9 minutes. The first exit temperature, the second exit temperature, the third time period, the fourth time period and the fifth time period can be adjusted according to different models.
After the air conditioner exits from the primary defrosting mode, the air conditioner continuously judges whether the control condition for entering the defrosting mode again is met, namely a second defrosting condition. And when the accumulated work of the air conditioner according to the heating mode meets a second period, the compressor continuously operates to meet a first period, and the time interval between the compressor and the first operation according to the defrosting mode is greater than a second period, a second defrosting condition is met, and the air conditioner enters the defrosting mode again to operate. The time is used as the control condition for entering the defrosting mode, the control mode is clearer, and the rapid increase of the frost layer can be effectively prevented. And when the air conditioner exits from the defrosting mode again, continuing to judge according to the second defrosting condition. Wherein the first period of time is preferably 1 minute.
When the air conditioner enters the defrost mode, the exit condition may be only a time factor, and there may be a case where the heat in the outdoor air is not sufficient to completely defrost for the length of time stipulated by the exit condition. In this case, referring to fig. 2, it is preferable that the outdoor fan is controlled to operate at a first defrosting rotation speed when the defrosting mode is entered, the first defrosting rotation speed is higher than the real-time operation speed of the outdoor fan in the heating mode, preferably, the maximum rotation speed, and the efficiency of the heat exchange is improved by the flow amount of the air. Another more preferable mode is that an electric heating device is arranged in the outdoor unit, and when the outdoor unit enters the defrosting mode and the outdoor fan is controlled to work at the first defrosting rotation speed, the electric heating device is controlled to start working, so that the defrosting process is accelerated. Meanwhile, in the defrosting mode, due to the fact that the compressor operates in a frequency reduction mode, in order to guarantee user experience, the rotating speed of the indoor fan is controlled to be the second defrosting rotating speed at the indoor end, the second defrosting rotating speed is smaller than the real-time operating rotating speed of the indoor fan in the heating mode, the lowest rotating speed is preferably selected, the indoor temperature of the indoor end is kept as far as possible when the indoor end exits from the heating mode, and actual experience of users is improved.
The defrosting control method of the air conditioner disclosed by the two embodiments of the invention does not need to switch between the heating mode and the cooling mode during defrosting, the system pressure can be kept approximately stable, and compared with the prior art, the waiting time for stabilizing the system pressure is saved, so that the proportion of the defrosting mode in the whole air conditioner running time is reduced.
The invention also discloses a defrosting control device of the air conditioner, which comprises the following components:
the first judging unit is used for judging whether the running working condition of the air conditioner meets the defrosting condition or not when the outdoor environment temperature is higher than 0 ℃ and lower than 5 ℃;
the processing unit is used for controlling the air conditioner to enter a defrosting mode when the operating condition of the air conditioner meets a defrosting condition, outputting a first control signal to control the frequency of the compressor to be defrosting frequency, and outputting a second control signal to control the opening of the electronic expansion valve to be defrosting opening, so that the surface temperature of the outdoor heat exchanger is reduced and maintained at 0 ℃; the defrosting frequency is lower than the real-time running frequency of the compressor in the heating mode, and the defrosting opening is larger than the real-time opening of the electronic expansion valve in the heating mode;
the second judging unit is used for judging whether the defrosting operation working condition of the air conditioner meets an exit condition or not;
and the switching unit is used for outputting an exit control signal to control the air conditioner to exit the defrosting mode and operate according to the set heating mode when the defrosting operation condition of the air conditioner meets the exit condition.
The defrosting frequency is preferably 40Hz, and the defrosting opening is preferably the maximum opening of the electronic expansion valve.
In order to optimize the defrosting effect, when the heating operation condition of the air conditioner meets the defrosting condition, the processing unit simultaneously outputs a third control signal to control the rotating speed of the outdoor fan to be a first defrosting rotating speed and control the rotating speed of the indoor fan to be a second defrosting rotating speed, wherein the first defrosting rotating speed is greater than the real-time rotating speed of the outdoor fan in the heating mode, and the rotating speed of the indoor fan is less than the real-time rotating speed of the indoor fan in the heating mode.
In this embodiment, it is preferable to select two time factors as the conditions for controlling the start of the defrost mode, i.e., the accumulated operating time of the compressor according to the heating mode and the first continuous operating time of the compressor. And when the accumulated working time of the compressor according to the heating mode meets a first period and the first continuous running time of the compressor meets a first time interval, determining that the air conditioner meets a first defrosting condition and starting defrosting. The duration of the first period may be set to 30 minutes to 60 minutes, the first period is preferably set to 1 minute, and the specific duration may be adjusted according to the capacity and model of the air conditioner, which is not further limited herein.
In this embodiment, the exit condition may be set in various ways, the first way uses a combination of a time factor and a temperature factor as the exit condition, and usually the surface temperature of the outdoor heat exchanger is continuously greater than the first exit temperature for a third period of time, or the surface temperature of the outdoor heat exchanger is continuously greater than the second exit temperature for a fourth period of time. Preferably the third period of time is 60s and the fourth period of time is 20s, the first exit temperature being less than the second exit temperature. It is understood that both the first exit temperature and the second exit temperature are above 0 ℃. The second is to use a time factor as an exit condition, preferably when the air conditioner is continuously operated in the defrost mode for a fifth period of time, preferably 9 minutes. The first exit temperature, the second exit temperature, the third time period, the fourth time period and the fifth time period can be adjusted according to different models.
After the air conditioner exits from the primary defrosting mode, the air conditioner continuously judges whether the control condition for entering the defrosting mode again is met, namely a second defrosting condition. And when the accumulated work of the air conditioner according to the heating mode meets a second period, the compressor continuously operates to meet a first period, and the time interval between the compressor and the first operation according to the defrosting mode is greater than a second period, a second defrosting condition is met, and the air conditioner enters the defrosting mode again to operate. The time is used as the control condition for entering the defrosting mode, the control mode is clearer, and the rapid increase of the frost layer can be effectively prevented. And when the air conditioner exits from the defrosting mode again, continuing to judge according to the second defrosting condition. Wherein the first period of time is preferably 1 minute.
The disclosed defrosting control device of air conditioner of this embodiment, need not switch between heating mode and the refrigeration mode when the defrosting, system pressure can keep roughly stable, compared with prior art and saved the latency of stable system pressure, consequently shortened the proportion that the defrosting mode accounts for whole air conditioner operating duration, and simultaneously, because the cross valve remains a operating condition all the time, the compressor can continuously carry indoor the inner with the heat energy in the air, the heat in the environment has been utilized simultaneously and the defrosting is carried out, so the energy has been saved, the liquid that can take place among the traditional defrosting process has still been stopped simultaneously and the risk is hit.
The present invention also discloses an air conditioner with the air conditioner defrosting control device, and the air conditioner defrosting control device refers to the detailed description of the above embodiments, which is not repeated herein. The air conditioner with the defrosting control device can achieve the same technical effect.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. The defrosting control method of the air conditioner is characterized by comprising the following steps:
when the outdoor environment temperature is higher than 0 ℃ and lower than 5 ℃, the air conditioner works in a heating mode to judge whether the defrosting condition is met;
when the accumulated working time of the compressor according to the heating mode meets a first period and the first continuous running time of the compressor meets a first time interval, determining that the air conditioner meets a first defrosting condition;
the air conditioner enters a defrosting mode, wherein the defrosting mode is to control the frequency of a compressor to be defrosting frequency, control the opening of an electronic expansion valve to be defrosting opening, control the rotating speed of an outdoor fan to be a first defrosting rotating speed, and control the rotating speed of an indoor fan to be a second defrosting rotating speed, so that the surface temperature of an outdoor heat exchanger is maintained at 0 ℃;
the defrosting frequency is lower than the real-time running frequency of a compressor in the heating mode, the defrosting opening is larger than the real-time opening of an electronic expansion valve in the heating mode, the first defrosting rotating speed is larger than the real-time running rotating speed of an outdoor fan in the heating mode, and the second defrosting rotating speed is smaller than the real-time running rotating speed of an indoor fan in the heating mode;
the air conditioner keeps operating in the defrosting mode until it is determined that the exit condition is satisfied.
2. The air conditioner defrost control method of claim 1, wherein the defrost frequency is 40Hz and the defrost opening is adjusted to a maximum opening by an electronic expansion valve.
3. The air conditioner defrost control method of claim 2, wherein the first defrost speed is an outdoor fan operation at a maximum speed, and the second defrost speed is an indoor fan operation at a minimum speed.
4. The air conditioner defrost control method of any one of claims 1-3, wherein the defrost condition includes a first defrost condition and a second defrost condition:
the first defrosting condition is that the air conditioner is started, the compressor works according to the heating mode, the accumulated work meets a first period, and the first continuous operation of the compressor meets a first time interval, so that the first defrosting condition is met;
after the first defrosting condition is met, the air conditioner operates according to a defrosting mode for the first time;
the second defrosting condition is that when the air conditioner operates according to the defrosting mode until the air conditioner exits after meeting the exit condition, the air conditioner operates according to the heating mode to accumulate to meet a second period, the compressor continuously operates for a first period, and the time interval between the air conditioner and the first time of operation according to the defrosting mode or the last time of operation according to the defrosting mode is greater than a second period, the second defrosting condition is met; and after the second defrosting condition is met, the air conditioner operates according to the defrosting mode again.
5. The air conditioner defrost control method of claim 4, wherein the exit condition includes at least one of:
the surface temperature of the outdoor heat exchanger is greater than the first exit temperature for a third continuous period of time;
or, the surface temperature of the outdoor heat exchanger is greater than the second exit temperature for a fourth period of time;
or, the air conditioner continuously operates for a fifth time period according to the defrosting mode;
wherein the first exit temperature is less than the second exit temperature.
6. The air conditioner defrost control method of claim 5, wherein the defrost mode further comprises controlling an outdoor electric heater to be maintained in an operation state.
7. An air conditioner defrosting control device, comprising:
the first judging unit is used for judging whether the heating operation working condition of the air conditioner meets the defrosting condition or not when the outdoor environment temperature is higher than 0 ℃ and lower than 5 ℃; when the accumulated working time of the compressor according to the heating mode meets a first period and the first continuous running time of the compressor meets a first time interval, determining that the air conditioner meets a first defrosting condition;
the processing unit is used for controlling the air conditioner to enter a defrosting mode when the operating condition of the air conditioner meets a defrosting condition, outputting a first control signal to control the frequency of the compressor to be defrosting frequency, outputting a second control signal to control the opening degree of the electronic expansion valve to be defrosting opening degree, outputting a third control signal to control the rotating speed of the outdoor fan to be first defrosting rotating speed, and controlling the rotating speed of the indoor fan to be second defrosting rotating speed, so that the surface temperature of the outdoor heat exchanger is reduced and maintained at 0 ℃; the defrosting frequency is lower than the real-time running frequency of the compressor in the heating mode, and the defrosting opening is larger than the real-time opening of the electronic expansion valve in the heating mode; the first defrosting rotating speed is greater than the real-time rotating speed of the outdoor fan in the heating mode, and the rotating speed of the indoor fan is less than the real-time rotating speed of the indoor fan in the heating mode;
the second judging unit is used for judging whether the defrosting operation working condition of the air conditioner meets an exit condition or not;
and the switching unit is used for outputting an exit control signal to control the air conditioner to exit the defrosting mode and operate according to the set heating mode when the defrosting operation condition of the air conditioner meets the exit condition.
8. An air conditioner characterized by comprising the air conditioner defrosting control means as set forth in claim 7.
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