CN110873435B - Anti-frosting control method for indoor unit of air conditioner - Google Patents

Anti-frosting control method for indoor unit of air conditioner Download PDF

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Publication number
CN110873435B
CN110873435B CN201811013477.8A CN201811013477A CN110873435B CN 110873435 B CN110873435 B CN 110873435B CN 201811013477 A CN201811013477 A CN 201811013477A CN 110873435 B CN110873435 B CN 110873435B
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China
Prior art keywords
expansion valve
opening degree
temperature
air conditioner
percentage
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CN201811013477.8A
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CN110873435A (en
Inventor
夏鹏
李旭
杨春雪
徐梦飞
闫学勇
冯维庆
刘晓凯
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Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
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Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
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Priority to CN201811013477.8A priority Critical patent/CN110873435B/en
Publication of CN110873435A publication Critical patent/CN110873435A/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41Defrosting; Preventing freezing
    • F24F11/43Defrosting; Preventing freezing of indoor units
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/62Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63Electronic processing
    • F24F11/64Electronic processing using pre-stored data
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/62Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63Electronic processing
    • F24F11/65Electronic processing for selecting an operating mode
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/70Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves

Abstract

The invention belongs to the technical field of air conditioners, and particularly relates to a control method for preventing frosting of an indoor unit of an air conditioner. In order to solve the problem that the experience of a user is influenced by the fact that an air conditioner loses refrigerating capacity during defrosting of an indoor unit, the anti-frosting control method provided by the invention comprises the following steps: s110, detecting the temperature Tz of the inner coil pipe at preset time intervals under the condition that the air conditioner is in a refrigerating mode; s120, judging a temperature interval where the temperature Tz of the inner coil pipe is located; and S130, selectively controlling the opening degree of an expansion valve of the air conditioner according to the temperature interval. In the above steps of the invention, the opening of the expansion valve is controlled according to the section of the temperature of the inner coil pipe, so as to control the flow rate of the refrigerant in the pipeline of the air conditioner, thereby realizing the slow defrosting of the indoor evaporator, delaying the frosting speed of the indoor unit, leading the air conditioner to enter the frosting period less, and further carrying out the defrosting by closing the expansion valve as little as possible.

Description

Anti-frosting control method for indoor unit of air conditioner
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a control method for preventing frosting of an indoor unit of an air conditioner.
Background
After the air conditioner operates for a period of time in a cooling mode, because the temperature of the evaporator of the indoor unit is lower than the saturation temperature corresponding to the atmospheric pressure, condensed water can be continuously generated, and when the temperature of a refrigerant is lower than zero, the condensed water can be frosted. The existing common control method is that the temperature duration time of the coil pipe of the indoor unit is detected, and the indoor unit enters into a frost prevention mode after the set time is reached. Specifically, taking the multi-split air conditioner as an example when the central air conditioner is in refrigeration operation, when the temperature of the inner coil is detected to be lower than a certain value for a certain time, in order to achieve quick defrosting, the expansion valve is closed to control the flow of the refrigerant, so that the refrigerant does not flow through the indoor unit any more, frost is removed slowly by utilizing the heat convection between indoor environment temperature air and the evaporator, and the defrosting cycle time depends on factors such as the size of the frosting area of the heat exchanger, the indoor environment temperature and the like. The disadvantage of this method is that, during the defrosting cycle of the indoor unit, the air conditioner has no cooling function because there is no refrigerant flowing in the indoor unit pipe, and therefore the air blown out from the indoor unit is natural air with the same temperature as the ambient temperature, which affects the cooling experience and comfort of the user.
The present invention has been made in view of the above circumstances.
Disclosure of Invention
In order to solve the problem that the experience of a user is affected due to the fact that the air conditioner loses refrigerating capacity during the defrosting of the indoor unit, the invention provides an anti-frosting control method for the indoor unit of the air conditioner.
The invention relates to an anti-frosting control method for an indoor unit of an air conditioner, which comprises the following steps: the method comprises the following steps: s110, detecting the temperature Tz of the inner coil pipe at preset time intervals under the condition that the air conditioner is in a refrigerating mode; s120, judging a temperature interval where the temperature Tz of the inner coil pipe is located; and S130, selectively controlling the opening degree of an expansion valve of the air conditioner according to the temperature interval.
In a preferred embodiment of the indoor unit frost prevention control method described above, before step S120, the method further includes: comparing the inner disk temperature Tz with a first set temperature T1(ii) a If Tz < T1And Tz < T1For a duration of t1Then step S120 is performed.
In a preferred embodiment of the indoor unit frost prevention control method, step S130 specifically includes: if T is2<Tz<T1Controlling the opening degree of the expansion valve to be a first set percentage of the current opening degree of the expansion valve; wherein, T2Is a second set temperature, and T2<T1
In a preferred embodiment of the indoor unit frost prevention control method, step S130 further includes: judging T when the opening degree of the expansion valve is the first set percentage of the opening degree of the current expansion valve2<Tz<T1If T is2<Tz<T1For a duration of t2Controlling the expansion valve to close to enable the air conditioner to enter a frost prevention protection mode; otherwise, go to step S110; wherein, t1<t2
In a preferred embodiment of the indoor unit frost prevention control method, step S130 further includes: if Tz is less than or equal to T2Controlling the opening degree of the expansion valve to be a second set percentage of the current opening degree of the expansion valve; wherein the second set percentage is less than the first set percentage.
In a preferred embodiment of the above indoor unit frost prevention control method, "if Tz ≦ T2The step of controlling the opening degree of the expansion valve to be a second set percentage of the current opening degree of the expansion valve "includes: if Tz is less than or equal to T2Detecting whether the rotating speed of the indoor fan is in a high wind gear; if yes, the opening degree of the expansion valve is controlled to be the second setting hundred of the current opening degree of the expansion valveDividing; if not, the indoor fan is switched to a high wind gear, and then the opening degree of the expansion valve is controlled to be the second set percentage of the opening degree of the current expansion valve.
In a preferred embodiment of the indoor unit frost prevention control method, step S130 further includes: under the condition that the opening degree of the expansion valve is the second set percentage of the opening degree of the current expansion valve, the Tz is judged to be less than or equal to T2If Tz ≦ T2For a duration of t3Controlling the expansion valve to close to enable the air conditioner to enter a frost prevention protection mode; otherwise, executing step S110; wherein, t1<t3
In a preferred embodiment of the indoor unit frost prevention control method, the first set temperature T is set to a value equal to or higher than a predetermined value1Is-1 ℃; the second set temperature T2Is-6 ℃; the time t1Is 5 minutes; said t is230 minutes; said t is3Was 10 minutes.
In a preferred embodiment of the above indoor unit frost prevention control method, the first set percentage is any percentage between 85% and 95%; or the first set percentage is 90%.
In a preferred embodiment of the above indoor unit frost prevention control method, the second set percentage is any percentage between 75% and 85%; or the second set percentage is 80%.
In the above steps of the invention, the opening of the expansion valve is controlled according to the section of the temperature of the inner coil pipe, so as to control the flow rate of the refrigerant in the pipeline of the air conditioner, thereby realizing the slow defrosting of the indoor evaporator, delaying the frosting speed of the indoor unit, leading the air conditioner to enter the frosting period less, and further carrying out the defrosting by closing the expansion valve as little as possible. Compared with the existing mode, namely after the duration time that the temperature of the inner coil pipe is lower than a certain temperature reaches the required time, the expansion valve is directly closed to enter the anti-frosting protection mode, the method can control the opening degree of the expansion valve according to the temperature of the inner coil pipe, for example, when the temperature of the inner coil pipe is in a certain temperature range, the opening degree of the expansion valve is reduced to reduce the flowing of the refrigerant in the pipeline (although the flowing of the refrigerant is reduced, the use experience of a user cannot be influenced), so that the frosting tendency is reduced, the defrosting can be slowly carried out, and the experience effect of the user is ensured.
Drawings
FIG. 1 is a main flow chart of the control method for preventing frosting of the indoor unit of the air conditioner;
fig. 2 is a detailed flowchart of a control method for preventing frosting of an indoor unit of an air conditioner according to an 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 flow chart of an anti-frosting control method of an indoor unit of an air conditioner. As shown in fig. 1, the method of the present invention comprises the steps of: s110, detecting the temperature Tz of the inner coil pipe at preset time intervals under the condition that the air conditioner is in a refrigerating mode; s120, judging a temperature interval of the temperature Tz of the inner coil; and S130, selectively controlling the opening degree of an expansion valve of the air conditioner according to the temperature interval. In the above steps of the invention, the opening of the expansion valve is controlled according to the section of the temperature of the inner coil pipe, so as to control the flow rate of the refrigerant in the pipeline of the air conditioner, thereby realizing the slow defrosting of the indoor evaporator, delaying the frosting speed of the indoor unit, leading the air conditioner to enter the frosting period less, and further carrying out the defrosting by closing the expansion valve as little as possible. Compared with the existing mode, namely after the duration time that the temperature of the inner coil pipe is lower than a certain temperature reaches the required time, the expansion valve is directly closed to enter the anti-frosting protection mode, the method can control the opening degree of the expansion valve according to the temperature of the inner coil pipe, for example, when the temperature of the inner coil pipe is in a certain temperature range, the opening degree of the expansion valve is reduced to reduce the flowing of the refrigerant in the pipeline (although the flowing of the refrigerant is reduced, the use experience of a user cannot be influenced), so that the frosting tendency is reduced, the defrosting can be slowly carried out, and the experience effect of the user is ensured.
Referring to fig. 2, fig. 2 is a detailed flowchart of a control method for preventing frosting of an indoor unit of an air conditioner according to an embodiment of the present invention. As shown in fig. 2, in the present embodiment, step S210 is first executed to detect the inner coil temperature Tz at predetermined time intervals when the air conditioner is in the cooling mode. The preset time may be flexibly set by a person skilled in the art, and may be, for example, 5 seconds, 10 seconds, 15 seconds, or the like, or other suitable time. After step S210, proceed to step S220, compare Tz and T1Wherein T is1Is the first set temperature. If Tz < T1And the duration reaches t1If yes, executing step S230, and determining the temperature interval of the inner coil temperature Tz; otherwise, step S210 is performed. Here the first set temperature T1May be-1 ℃ for a duration t1May be 5 minutes; the person skilled in the art can also experimentally obtain a reasonable first set value T1And duration t1The specific set value is not limited herein.
If T is2<Tz<T1Then, step S240 is executed to control the opening degree of the expansion valve to 90% (the first set percentage) of the current opening degree of the expansion valve. Because the frosting degree of the inner coil pipe is lower at the moment, the flow of the refrigerant can be properly reduced, and the frosting on the indoor unit can be slowly removed. The first set percentage may also be flexibly set, for example to any percentage between 85% and 95%. Further, step S241 is executed to judge T2<Tz<T1The duration of (c). If T is2<Tz<T1For a duration of t2If yes, executing step S250, controlling the expansion valve to close to make the air conditioner enter into the anti-frosting protection mode; otherwise, step S110 is executed. Here the second set temperature T2Can be-6 ℃, and the duration t2May be 30 minutes, and a person skilled in the art can also experimentally obtain a reasonable second set value T2And duration t2Let T be2<T1,t1<t2The specific set value is not limited herein.
It will be understood by those skilled in the art that the frosting speed is slow due to the control of the opening degree of the expansion valve, and the frosting speed is fast, i.e. the frosting speed can be delayed by controlling the opening degree of the expansion valve, and when T is2<Tz<T1For a duration of t2When the frosting of the indoor unit reaches a certain degree, the expansion valve can be controlled to be closed so that the air conditioner enters a frosting prevention protection program.
If Tz is less than or equal to T2Then, step S260 is executed to detect whether the rotation speed of the indoor fan is in the high wind gear. If so, step S270 is executed to control the opening degree of the expansion valve to 80% of the current opening degree of the expansion valve (second set percentage). If not, step S280 is executed, the rotating speed of the indoor fan is switched to the high wind gear, and then step S270 is executed. Because the frosting degree of the inner coil pipe is more at the moment, more refrigerant flow can be properly reduced, the rotating speed of the indoor fan is increased, and the frosting on the indoor unit is quickened. The second set percentage may also be flexibly set, for example to any percentage between 75-85%.
Further, step S271 is executed to judge that Tz is less than or equal to T2The duration of (c). If Tz is less than or equal to T2For a duration of t3If yes, executing step S250, controlling the expansion valve to close to make the air conditioner enter into the anti-frosting protection mode; otherwise, step S110 is executed. Duration t here3May be 10 minutes, and a reasonable duration t may be obtained experimentally by those skilled in the art3And t is1<t3Preferably t3<t2The specific set value is not limited herein.
As can be understood by those skilled in the art, because the defrosting speed is slower and the frosting speed is faster by controlling the opening degree of the expansion valve, namely, the frosting speed can be delayed by controlling the opening degree of the expansion valve, and when Tz is less than or equal to T2For a duration of t3When the frosting degree of the indoor unit reaches a certain degree, the expansion valve can be controlled to be closed to make the air conditioner enterEnter the anti-frosting protection procedure.
In summary, the anti-frosting control method for the indoor unit of the air conditioner controls the opening degree of the expansion valve through the interval where the temperature of the inner coil pipe is located, and further controls the flow rate of the refrigerant in the pipeline of the air conditioner, so that the indoor evaporator is frosted slowly, the frosting speed of the indoor unit is delayed, the air conditioner enters the frosting period less, and the frosting is performed in a mode of closing the expansion valve as less as possible. Compared with the existing mode, namely after the duration time that the temperature of the inner coil pipe is lower than a certain temperature reaches the required time, the expansion valve is directly closed to enter the anti-frosting protection mode, the method can control the opening degree of the expansion valve according to the temperature of the inner coil pipe, for example, when the temperature of the inner coil pipe is in a certain temperature range, the opening degree of the expansion valve is reduced to reduce the flowing of the refrigerant in the pipeline (although the flowing of the refrigerant is reduced, the use experience of a user cannot be influenced), so that the frosting tendency is reduced, the defrosting can be slowly carried out, and the experience effect of the user is ensured.
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 (7)

1. An anti-frosting control method for an indoor unit of an air conditioner is characterized by comprising the following steps:
s110, detecting the temperature Tz of the inner coil pipe at preset time intervals under the condition that the air conditioner is in a refrigerating mode;
s120, judging a temperature interval where the temperature Tz of the inner coil pipe is located;
s130, selectively controlling the opening degree of an expansion valve of the air conditioner according to the temperature interval;
prior to step S120, the method further comprises:
comparing the temperature of the inner coil Tz with a first set temperature T1
If Tz < T1And Tz < T1For a duration of t1Then, go to step S120;
wherein, step S130 specifically includes:
if T is2<Tz<T1Controlling the opening degree of the expansion valve to be a first set percentage of the current opening degree of the expansion valve;
wherein, T2Is a second set temperature, and T2<T1
Under the condition that the opening degree of the expansion valve is a first set percentage of the current opening degree of the expansion valve, T is judged2<Tz<T1If T is2<Tz<T1For a duration of t2Controlling the expansion valve to close to enable the air conditioner to enter a frost prevention protection mode; otherwise, go to step S110;
wherein, t1<t2
2. The indoor unit frost prevention control method of claim 1, wherein step S130 further comprises:
if Tz is less than or equal to T2Controlling the opening degree of the expansion valve to be a second set percentage of the current opening degree of the expansion valve;
wherein the second set percentage is less than the first set percentage.
3. The indoor unit frost prevention control method of claim 2, wherein if Tz is less than or equal to T2The step of controlling the opening degree of the expansion valve to be a second set percentage of the current opening degree of the expansion valve "includes:
if Tz is less than or equal to T2Detecting whether the rotating speed of the indoor fan is in a high wind gear;
if yes, controlling the opening degree of the expansion valve to be a second set percentage of the current opening degree of the expansion valve; if not, the indoor fan is switched to a high wind gear, and then the opening degree of the expansion valve is controlled to be the second set percentage of the opening degree of the current expansion valve.
4. The indoor unit frost prevention control method of claim 3, wherein the step S130 further comprises:
under the condition that the opening degree of the expansion valve is the second set percentage of the opening degree of the current expansion valve, the Tz is judged to be less than or equal to T2If Tz ≦ T2For a duration of t3Controlling the expansion valve to close to enable the air conditioner to enter a frost prevention protection mode; otherwise, executing step S110;
wherein, t1<t3
5. The indoor unit frost prevention control method of claim 4, wherein the first set temperature T is set to1Is-1 ℃; the second set temperature T2Is-6 ℃;
the time t1Is 5 minutes; said t is230 minutes; said t is3Was 10 minutes.
6. The indoor unit frost prevention control method according to any of claims 1 to 5, wherein the first set percentage is any percentage between 85% and 95%; or
The first set percentage is 90%.
7. The indoor unit frost prevention control method according to any of claims 2 to 5, wherein the second set percentage is any percentage between 75% and 85%; or
The second set percentage is 80%.
CN201811013477.8A 2018-08-31 2018-08-31 Anti-frosting control method for indoor unit of air conditioner Active CN110873435B (en)

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CN111765607A (en) * 2020-06-19 2020-10-13 海信(山东)空调有限公司 Method for controlling electronic expansion valve of multi-split air conditioner, multi-split air conditioner and medium

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