CN114484739A - Defrosting control method for air conditioner - Google Patents
Defrosting control method for air conditioner Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
- F24F11/67—Switching between heating and cooling modes
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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
- F24F11/83—Control 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
- F24F11/84—Control 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
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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
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a defrosting control method of an air conditioner, which comprises the steps of controlling an electromagnetic valve to be opened to start defrosting when defrosting conditions are met; the opening of the electromagnetic valve is controlled according to the difference value delta T between the condensation point temperature Tes and the surface temperature Te of the outdoor heat exchanger, so that the defrosting requirement is met, the heating and defrosting of the outdoor heat exchanger are realized, the influence on the normal heating of the air conditioner is avoided, the defrosting is realized under the condition that the heating is not influenced, and the use experience of a user is improved.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a defrosting control method of an air conditioner.
Background
The current defrosting control logic of the air conditioner is as follows: under the normal condition of heating at the air conditioner, because outdoor environment temperature is lower, in the heating process, the off-premises station condenser can produce the comdenstion water, and the comdenstion water frosts easily under the low temperature condition, under the condition of long-time operation, can become to freeze from frosting, still can freeze on the chassis and deposit water, causes the heating effect to worsen, needs the air conditioner to get into the defrosting procedure this moment, prevents that the off-premises station from freezing.
The existing defrosting program is to stop the fan of the indoor unit, the four-way valve of the outdoor unit is reversed, the air conditioner is changed into a refrigerating state, a refrigerant in a high-temperature and high-pressure state of the compressor in the refrigerating state directly enters the condenser, the condenser is heated and defrosted, and meanwhile, in order not to influence user experience, the indoor unit is prevented from blowing cold air, so the fan of the indoor unit stops, a room can become cold, if the effect of the air conditioner is not good, the defrosting program is frequently entered, and the user experience of the air conditioner is greatly influenced.
At present, an air conditioner does not heat an indoor unit in the whole defrosting process, the defrosting process changes along with the change of outdoor environment temperature, the experience of a user is influenced in the defrosting process, and if the outdoor humidity is high, the outdoor unit is frequently defrosted, so that the user is greatly influenced, and the user experience is seriously influenced.
Disclosure of Invention
The invention provides a defrosting control method for an air conditioner, which solves the technical problem that the user experience is seriously influenced when the air conditioner defrosts in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
a defrosting pipeline is distributed on an outdoor heat exchanger of an air conditioner, one end of the defrosting pipeline is connected with an exhaust pipe of a compressor, the other end of the defrosting pipeline is connected with an air suction pipe of the compressor, and an electromagnetic valve is arranged on the defrosting pipeline;
the defrosting control method comprises the following steps:
when the defrosting condition is met, the electromagnetic valve is controlled to be opened to start defrosting;
and controlling the opening degree of the electromagnetic valve according to the difference delta T between the condensation point temperature Tes and the surface temperature Te of the outdoor heat exchanger.
Further, the controlling the opening degree of the electromagnetic valve according to the difference value delta T between the condensation point temperature Tes and the surface temperature Te of the outdoor heat exchanger specifically comprises the following steps:
when the first set difference value is larger than or equal to delta T and smaller than the second set difference value, the opening degree of the electromagnetic valve is the first set opening degree;
when the second set difference is less than or equal to the third set difference, the opening degree of the electromagnetic valve is the second set opening degree;
when the delta T is larger than or equal to a third set difference value, the opening degree of the electromagnetic valve is a third set opening degree;
wherein the first set opening degree is smaller than the second set opening degree and smaller than the third set opening degree.
Still further, the defrost control method further comprises:
and controlling the frequency of the compressor according to the difference delta T between the condensation point temperature Tes and the surface temperature Te of the outdoor heat exchanger.
Further, the controlling the frequency of the compressor according to the difference Δ T between the condensation point temperature Tes and the surface temperature Te of the outdoor heat exchanger specifically includes:
when the first set difference is less than or equal to the second set difference, the frequency of the compressor is increased by the first set frequency;
when the second set difference is less than or equal to the third set difference, the frequency of the compressor is increased by a second set frequency;
when the delta T is larger than or equal to a third set difference value, the frequency of the compressor is increased by a third set frequency;
wherein the first set frequency is less than the second set frequency and less than the third set frequency.
Still further, the control method further includes the steps of:
detecting the outdoor environment temperature after the air conditioner is started;
if the outdoor environment temperature is less than the first set outer ring temperature, the electromagnetic valve is opened; and after the electromagnetic valve is opened for the first set time, the electromagnetic valve is closed, and the air conditioner is heated and operated.
Further, the defrosting conditions are as follows: and in the heating state, the surface temperature Te of the outdoor heat exchanger is less than or equal to the condensation point temperature Tes for the second set time.
Still further, the control method further includes:
after the defrosting time reaches the minimum defrosting time, judging whether any one of the following conditions is met, and if any one of the following conditions is met, judging that the defrosting quitting condition is met, closing the electromagnetic valve and stopping defrosting;
(a) the surface temperature of the outdoor heat exchanger exceeds the first set temperature for a third set time;
(b) the surface temperature of the outdoor heat exchanger exceeds a second set temperature for a fourth set time;
(c) the defrosting time reaches the maximum defrosting time Tim;
wherein the third set time is more than the fourth set time, and the first set temperature is less than the second set temperature.
Further, if k1 × T-k2 is less than or equal to the time threshold, the maximum defrost time Tim = the time threshold;
if k 1T-k 2 > time threshold, then maximum defrost time Tim = k 1T-k 2;
wherein k1 is more than 0 and less than 1, and k2 is more than 0 and less than or equal to 2; and T is the time interval between the starting time of the current defrosting and the ending time of the last defrosting.
Still further, the control method further includes:
if the maximum defrost interval time T has been reached from the last defrost finish timeSpacerAnd then the electromagnetic valve is opened to start defrosting.
Further, the maximum defrost interval time TSpacerAccording to the outdoor ambient temperature TRing (C)And determining the accumulated running time of the compressor:
when the second set external ring temperature is less than or equal to TRing (C)< first set outer ring temperature, and the accumulated operating time of the compressor reaches the first set operating time, the maximum defrosting interval time TSpacerSetting the running time for the first time;
when the third set external ring temperature is less than or equal to TRing (C)< second set outer ring temperature, and compressor fatigueWhen the running time reaches the second set running time, the maximum defrosting interval time TSpacerSetting the running time for the second time;
when T isRing (C)< third set external loop temperature, and the accumulated operation time of the compressor reaches the third set operation time, the maximum defrosting interval time TSpacerSetting an operating time for the third;
wherein the first set operation time is less than the second set operation time and less than the third set operation time.
Compared with the prior art, the invention has the advantages and positive effects that: according to the defrosting control method of the air conditioner, when the defrosting condition is met, the electromagnetic valve is controlled to be opened, and defrosting is started; the opening of the electromagnetic valve is controlled according to the difference value delta T between the condensation point temperature Tes and the surface temperature Te of the outdoor heat exchanger, so that the defrosting requirement is met, the heating and defrosting of the outdoor heat exchanger are realized, the influence on the normal heating of the air conditioner is avoided, the defrosting is realized under the condition that the heating is not influenced, and the use experience of a user is improved.
Other features and advantages of the present invention will become more apparent from the detailed description of the embodiments of the present invention when taken in conjunction with the accompanying drawings.
Drawings
FIG. 1 is a flow chart of an embodiment of a defrost control method for an air conditioner in accordance with the present invention;
FIG. 2 is a flow chart illustrating another embodiment of a defrost control method for an air conditioner according to the present invention;
fig. 3 is a flowchart illustrating a defrosting control method for an air conditioner according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Aiming at the technical problem that the user experience is seriously influenced when the conventional air conditioner is defrosted, the invention provides the defrosting control method of the air conditioner. Hereinafter, the defrosting control method of the air conditioner according to the present invention will be described in detail with reference to the accompanying drawings.
In the air conditioner of the embodiment, the outdoor heat exchanger is provided with the defrosting pipeline, one end of the defrosting pipeline is connected with the exhaust pipe of the compressor, the other end of the defrosting pipeline is connected with the air suction pipe of the compressor, and the defrosting pipeline is provided with the electromagnetic valve. In this embodiment, the defrosting pipe is disposed on the lower surface of the outdoor heat exchanger and the bottom plate of the outdoor unit. The compressor and the outdoor heat exchanger are both arranged on the chassis.
The defrosting pipeline bypasses the outdoor heat exchanger and the chassis in sequence, when the electromagnetic valve is opened, high-temperature and high-pressure refrigerants discharged by the compressor enter the defrosting pipeline through the exhaust pipe, the defrosting pipeline heats the outdoor heat exchanger and the chassis, the outdoor heat exchanger is prevented from frosting, and the chassis is prevented from being frozen. The refrigerant in the defrosting pipeline flows back to the compressor through the air return pipe, then is quickly changed into high-temperature and high-pressure gaseous refrigerant under the action of the compressor, and is continuously heated for the outdoor heat exchanger and the chassis.
The defrosting pipeline of this embodiment is the capillary, and the solenoid valve is the check valve, and the capillary twines the upper surface in outdoor heat exchanger lower part and chassis.
The refrigerant is led to the capillary tube from the compressor exhaust pipe, flows through the outdoor heat exchanger and the chassis along the capillary tube, finally is converged into the muffler, then is rapidly changed into a high-temperature and high-pressure gaseous refrigerant under the action of the compressor, and is continuously heated and defrosted for the outdoor heat exchanger, so that the chassis is prevented from being frozen. The one-way valve can control the refrigerant to flow in one direction, so that the base plate of the air conditioner outdoor unit and the outdoor heat exchanger do not freeze or frost under the action of high-temperature and high-pressure gas, and the user experience is greatly improved.
Under the opening state of the one-way valve, the capillary tube starts to heat and defrost the outdoor heat exchanger and the chassis; the air conditioner normally operates in the state of closing the one-way valve, does not need to be shut down in the states of opening and closing the one-way valve, does not need four-way valve reversing, and is always in normal operation for heating, so that the normal requirements of users are met.
In the running process of the air conditioner, the electromagnetic valve is opened, the high-temperature and high-pressure refrigerant discharged by the compressor is divided into two parts, wherein one part of the refrigerant enters the four-way valve to carry out normal heating circulation; and the other part of the refrigerant enters a defrosting pipeline to defrost.
On surrounding outdoor heat exchanger and chassis through the design defrosting pipeline, utilize the refrigerant in the defrosting pipeline to heat outdoor heat exchanger and chassis, play the effect that prevents outdoor heat exchanger frosting, can preheat the chassis simultaneously, prevent that the chassis from freezing, improved user experience greatly. Therefore, the defrosting pipeline achieves the purpose of preventing frosting and icing, even the air conditioner can be prevented from entering defrosting, and the user experience is improved.
The air conditioner executes the following defrosting control method to realize the heating and defrosting functions of the air conditioner.
The first embodiment,
The defrosting control method for the air conditioner of the embodiment mainly comprises the following steps, which are shown in fig. 1.
Step S21: and judging whether the defrosting condition is met.
If the defrost condition is not met, the solenoid is closed.
If the defrosting condition is satisfied, step S22 is performed.
Step S22: when the defrosting condition is met, the electromagnetic valve is controlled to be opened to start defrosting; and controlling the opening degree of the electromagnetic valve according to the difference delta T between the condensation point temperature Tes and the surface temperature Te of the outdoor heat exchanger.
The method specifically comprises the following steps:
(22-1) acquiring a condensation point temperature Tes and an outdoor heat exchanger surface temperature Te.
And a defrosting sensor is arranged on the surface of the outdoor heat exchanger and used for detecting the surface temperature Te of the outdoor heat exchanger. As a preferable design, the defrosting sensor is arranged at the lower part of the outdoor heat exchanger.
(22-2) calculating a difference Δ T = Tes-Te.
And (22-3) opening the electromagnetic valve to start defrosting, and controlling the opening of the electromagnetic valve according to delta T.
The size of the difference value delta T reflects the frosting degree, so that the opening of the electromagnetic valve is controlled according to the difference value delta T, the flow of the refrigerant flowing into the defrosting pipeline can be controlled, the defrosting requirement is met, the outdoor heat exchanger is heated and defrosted, and the influence on the normal heating of the air conditioner is avoided.
According to the defrosting control method of the air conditioner, when the defrosting condition is met, the electromagnetic valve is controlled to be opened, and defrosting is started; the opening of the electromagnetic valve is controlled according to the difference value delta T between the condensation point temperature Tes and the surface temperature Te of the outdoor heat exchanger, so that the defrosting requirement is met, the heating and defrosting of the outdoor heat exchanger are realized, the influence on the normal heating of the air conditioner is avoided, the defrosting is realized under the condition that the heating is not influenced, and the use experience of a user is improved.
In this embodiment, the controlling the opening degree of the electromagnetic valve according to the difference Δ T between the condensation point temperature Tes and the surface temperature Te of the outdoor heat exchanger specifically includes:
(22-3-1) when the first set difference is less than or equal to the second set difference, the opening degree of the electromagnetic valve is the first set opening degree;
(22-3-2) when the second set difference is less than or equal to the third set difference, the opening degree of the electromagnetic valve is the second set opening degree;
(22-3-3) when the delta T is larger than or equal to a third set difference value, the opening degree of the electromagnetic valve is a third set opening degree;
wherein the first set opening degree is smaller than the second set opening degree and smaller than the third set opening degree.
Therefore, the larger Δ T is, the more serious the frosting degree is, and in order to defrost quickly, the larger the opening of the electromagnetic valve is, so as to meet the defrosting requirement, and realize quick defrosting.
As a preferable design of this embodiment, the first set difference is 0; the second set difference value is 2 ℃; the third set difference value is 3 ℃; the first set opening degree is MAX 1/2; the second set opening degree is MAX 2/3; the third set opening degree is MAX; wherein, MAX is the full-opening degree of the electromagnetic valve.
That is to say that the first and second electrodes,
when delta T is more than or equal to 0 and less than 2 ℃, the frosting degree is relatively slight, the flow rate of the refrigerant needing defrosting is relatively small, and the opening degree of the electromagnetic valve is controlled to be MAX 1/2;
when delta T is more than or equal to 2 ℃ and less than 3 ℃, the frosting degree is slightly serious, and the opening of the electromagnetic valve is MAX 2/3;
when the delta T is more than or equal to 3 ℃, the frosting degree is serious, the flow of the needed defrosting refrigerant is large, the opening degree of the electromagnetic valve is MAX, namely the electromagnetic valve is controlled to be fully opened, so as to defrost as soon as possible.
By selecting the values, the opening degree of the electromagnetic valve is determined according to the range of the difference value delta T, so that the defrosting requirement can be met, and the normal heating of the air conditioner is prevented from being influenced by excessive refrigerants for defrosting.
In the process of heating during the operation of the air conditioner, the heating is prevented from being influenced by defrosting, even the air conditioner can be prevented from defrosting, and the user experience is improved.
In the present embodiment, when the defrosting condition is satisfied, the frequency of the compressor needs to be controlled in addition to controlling the opening degree of the electromagnetic valve, and therefore, the air conditioner defrosting control method of the present embodiment further includes the following steps, see fig. 2.
Step S23: and controlling the frequency of the compressor according to the difference delta T between the condensation point temperature Tes and the surface temperature Te of the outdoor heat exchanger.
The size of the difference value delta T influences the opening of the electromagnetic valve, influences the quantity of the refrigerant entering the defrosting pipeline, and further influences the quantity of the refrigerant flowing into the indoor unit, so that the frequency of the compressor needs to be adjusted according to the difference value delta T, the normal heating requirement of the air conditioner is met, the influence on the indoor heating effect is prevented, and meanwhile, the defrosting requirement is met.
In this embodiment, controlling the frequency of the compressor according to the difference Δ T between the condensation point temperature Tes and the surface temperature Te of the outdoor heat exchanger specifically includes:
(23-1) when the first set difference is less than or equal to the delta T and less than the second set difference, increasing the frequency of the compressor by the first set frequency;
(23-2) when the second set difference is less than or equal to the third set difference, increasing the frequency of the compressor by the second set frequency;
(23-3) when the delta T is larger than or equal to a third set difference value, increasing the frequency of the compressor by a third set frequency;
wherein the first set frequency is less than the second set frequency and less than the third set frequency.
Therefore, the larger Δ T is, the more the frost formation is serious, the larger the opening degree of the electromagnetic valve is, the larger the amount of refrigerant flowing into the defrosting pipeline is, the smaller the amount of refrigerant used for heating the air conditioner is, and the compressor frequency needs to be increased in order to avoid affecting the normal heating of the air conditioner.
As a preferable design of this embodiment, the first set difference is 0; the second set difference value is 2 ℃; the third set difference value is 3 ℃; the first set frequency is 3 HZ; the second set frequency is 4 HZ; the third set frequency is 5 HZ.
That is to say that the first and second electrodes,
when the temperature is more than or equal to 0 and less than 2 ℃, the frosting degree is slight, the opening degree of the electromagnetic valve is small, the quantity of the refrigerant entering a defrosting pipeline is small, the influence on heating of an air conditioner is small, the required frequency increment value is small, and the frequency increment value of the compressor is 3 HZ.
When the temperature delta T is more than or equal to 2 ℃ and less than 3 ℃, the frosting degree is slightly serious, the opening degree of the electromagnetic valve is slightly larger, the amount of refrigerant entering a defrosting pipeline is slightly larger, the influence on heating of an air conditioner is slightly larger, the required frequency increase value is slightly larger, and the frequency increase value of the compressor is 4 HZ.
When the delta T is more than or equal to 3 ℃, the frosting degree is serious, the opening of the electromagnetic valve is large, the amount of refrigerant entering a defrosting pipeline is large, the influence on heating of an air conditioner is large, the required frequency increment value is large, and the frequency increment value of the compressor is 5 HZ.
By selecting the value, the frequency increase value of the compressor is determined according to the range of the difference value delta T, so that the defrosting requirement can be met, and the normal heating of the air conditioner is ensured.
If the frequency of the compressor is increased to exceed the set maximum frequency, the frequency of the compressor is increased to the set maximum frequency to protect the compressor. In the present embodiment, the highest frequency set is 95 Hz.
According to the defrosting control method, when the defrosting condition is met, the electromagnetic valve is opened to start defrosting, the opening degree of the electromagnetic valve is controlled according to the difference value delta T, and meanwhile, the frequency of the compressor is increased under the normal operation condition, so that the defrosting is prevented from influencing the indoor heating effect, and the user experience is guaranteed.
During defrosting, protection of compressor current, compressor discharge, and the like is effective. During defrosting, due to protection or fault shutdown, the compressor still enters defrosting operation (the operation of the compressor is still limited by the oil return platform) after being restarted, and the defrosting time is not counted in the shutdown time. During defrosting, the opening control logic of the electronic expansion valve of the air conditioner is not changed, and the opening of the electronic expansion valve is still adjusted according to the logic of the existing air conditioner during heating.
The defrosting control method of the present embodiment further includes the following steps, as shown in fig. 3.
Step S11: after the air conditioner is started, the outdoor environment temperature is detected.
Step S12: and judging whether the outdoor environment temperature is less than a first set outer ring temperature.
In this embodiment, the first set outer ring temperature is 5 ℃.
If the outdoor ambient temperature is greater than or equal to the first set outer ring temperature, step S14 is performed.
If the outdoor ambient temperature is less than the first set outer ring temperature, the step S13 is executed: opening the electromagnetic valve to start defrosting; after the solenoid valve is opened for the first set time, the solenoid valve is closed, and then step S14 is performed.
Step S14: the air conditioner performs heating operation.
Through the design steps S11-S14, the outdoor environment temperature is detected firstly after the air conditioner is started; if the outdoor environment temperature is less than the first set outer ring temperature, the electromagnetic valve is opened, so that the outdoor heat exchanger and the chassis can be heated when the air conditioner is started, the frost and the ice are firstly dissolved, the air conditioner can be normally heated, the electromagnetic valve is closed after being opened for the first set time (such as 3 minutes), and the air conditioner starts to normally heat.
In the air conditioner heating operation state, step S21 is executed to determine whether the defrosting condition is satisfied.
In the present embodiment, the defrosting conditions of step S21 are: and in the heating state, the surface temperature Te of the outdoor heat exchanger is less than or equal to the condensation point temperature Tes for a second set time (such as 2 minutes).
When the surface temperature Te of the outdoor heat exchanger is less than or equal to the condensation point temperature Tes, the outdoor heat exchanger can frost; in order to avoid frequent defrosting of the air conditioner, when the second set time is continuously satisfied and the surface temperature Te of the outdoor heat exchanger is less than or equal to the condensation point temperature Tes, the defrosting condition is determined to be satisfied, and then step S22 is executed, the electromagnetic valve is opened, and defrosting is started.
In the present embodiment, the dew point temperature Tes = C × Tao — α.
Wherein, Tao is the outdoor ambient temperature; α = 6; c =0.8 at Tao < 0 ℃; when Tao is more than or equal to 0 ℃, C = 0.6.
By selecting the calculation formula, the relatively accurate condensation point temperature Tes can be obtained, and whether the defrosting condition is met or not can be judged more accurately.
In order to guarantee the defrosting time, prevent the defrosting time from being too long and avoid energy waste, after the defrosting time reaches the minimum defrosting time (such as 1 minute), whether any one of the following conditions is met or not is judged, and when any one of the following conditions is met, the condition that the defrosting is quitted is judged to be met, the electromagnetic valve is closed, and the defrosting is stopped.
Condition (a): the surface temperature of the outdoor heat exchanger exceeds the first set temperature (such as 5 ℃) for a third set time (such as 60 seconds);
condition (b): the surface temperature of the outdoor heat exchanger exceeds the second set temperature (such as 10 ℃) for a fourth set time (such as 20 seconds);
condition (c): the defrosting time reaches the maximum defrosting time Tim;
wherein the third set time is more than the fourth set time, and the first set temperature is less than the second set temperature.
In the defrosting process, when the defrosting time reaches the minimum defrosting time and meets the conditions (a), (b) or (c), the defrosting is stopped, so that the defrosting effect is ensured, and energy waste caused by excessive defrosting is avoided.
For example, after the defrosting time reaches 1 minute, if the surface temperature of the outdoor heat exchanger is maintained for 60 seconds and exceeds 5 ℃, or the surface temperature of the outdoor heat exchanger is maintained for 20 seconds and exceeds 10 ℃, or the defrosting time reaches the maximum defrosting time Tim, the defrosting quitting condition is met, the electromagnetic valve is closed, and defrosting is stopped.
In this embodiment, the calculation process of the maximum defrosting time Tim is:
if k1 × T-k2 is not greater than the time threshold, the maximum defrost time Tim = the time threshold;
if k 1T-k 2 > time threshold, then maximum defrost time Tim = k 1T-k 2;
wherein k1 is more than 0 and less than 1, and k2 is more than 0 and less than or equal to 2; and T is the time interval between the starting time of the current defrosting and the ending time of the last defrosting. For example, k1=0.25, k2= 2.
The time threshold is a set value to ensure the maximum defrosting time. In this example, the time threshold is 12 minutes.
That is to say that the first and second electrodes,
if 0.25 × T-2 ≦ 12 minutes, then Tim =12 minutes;
if 0.25 × T-2 > 12 minutes, then Tim =0.25 × T-2.
It can be seen that when k 1T-k 2 > the time threshold, T is larger, k 1T-k 2 is larger, that is, the larger the interval time between two defrosts is, the larger the maximum defrosting time Tim is to ensure defrosting effect.
The air conditioner control method of the present embodiment further includes the steps of:
if the maximum defrost interval time T has been reached from the last defrost finish timeSpacerAnd then the electromagnetic valve is opened to start defrosting. Therefore, when the air conditioner does not enter the defrosting mode for a long time, the defrosting mode can be forcibly carried out, the phenomenon that the air conditioner does not enter the defrosting mode for a long time due to the fact that the temperature detection module or other modules break down and the like is avoided, and the defrosting requirement is guaranteed.
Maximum defrost interval time TSpacerAccording to the outdoor ambient temperature TRing (C)And determining the accumulated running time of the compressor:
(1) when the second set external ring temperature is less than or equal to TRing (C)< first set outer ring temperature, and the accumulated operating time of the compressor reaches the first set operating time, the maximum defrosting interval time TSpacerSetting the running time for the first time;
(2) when the third set external ring temperature is less than or equal to TRing (C)The maximum defrosting interval time T is less than the second set external loop temperature and the accumulated operation time of the compressor reaches the second set operation timeSpacerSetting the running time for the second time;
(3) when T isRing (C)< third set external loop temperature, and the accumulated operation time of the compressor reaches the third set operation time, the maximum defrosting interval time TSpacerSetting an operating time for the third;
wherein the first set operation time is less than the second set operation time and less than the third set operation time.
According to the outdoor ambient temperature TRing (C)The accumulated running time of the compressor can determine the accurate maximum defrosting interval time TSpacerThus, timely defrosting is ensured, and excessive defrosting is avoided.
In this example, the first set outer loop temperature is 5 ℃, the second set outer loop temperature is-2 ℃, the third set outer loop temperature is-7 ℃, the first set run time is 60 minutes, the second set run time is 90 minutes, and the third set run time is 150 minutes.
Namely:
when the temperature is less than or equal to minus 2 ℃ and T is less than or equal toRing (C)Less than 5 deg.C, and the accumulated running time of compressor reaches 60 min, the mostLarge defrost interval time TSpacerIt was 60 minutes.
When the temperature is less than or equal to minus 7 ℃ and T is less than or equal toRing (C)-2 deg.C, and the accumulated running time of the compressor reaches 90 min, the maximum defrosting interval time TSpacerWas 90 minutes.
When T isRing (C)-7 ℃ and the cumulative operating time of the compressor reaches 150 minutes, the maximum defrosting interval time TSpacerWas 150 minutes.
In the embodiment, when defrosting is finished or the refrigeration and dehumidification mode is entered, the accumulated running time of the compressor is cleared, and excessive defrosting is prevented. When the air conditioner is shut down or the temperature detection module is shut down, the accumulated running time of the compressor is not cleared, but the time after the air conditioner is shut down is not accumulated in the accumulated running time of the compressor.
Example II,
The embodiment provides an air conditioner, which comprises a compressor, a four-way valve, an indoor heat exchanger, an outdoor heat exchanger, a defrosting pipeline and a controller.
The compressor, the four-way valve, the indoor heat exchanger and the outdoor heat exchanger form a refrigerant circulating pipeline for meeting the refrigerating and heating requirements of users.
And the defrosting pipeline is arranged on the outdoor heat exchanger, one end of the defrosting pipeline is connected with an exhaust pipe of the compressor, the other end of the defrosting pipeline is connected with an air return pipe of the compressor, and the defrosting pipeline is provided with an electromagnetic valve.
And the controller controls the operation of the whole air conditioner such as the electromagnetic valve, the four-way valve, the compressor and the like.
The controller executes the defrosting control method of the air conditioner in the first embodiment, so that the defrosting requirement is met, heating and defrosting are performed on the outdoor heat exchanger and the chassis, normal heating of the air conditioner is avoided, defrosting is realized under the condition that heating is not affected, and the use experience of a user is improved.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (10)
1. A defrosting control method for an air conditioner is characterized in that a defrosting pipeline is arranged on an outdoor heat exchanger of the air conditioner, one end of the defrosting pipeline is connected with an exhaust pipe of a compressor, the other end of the defrosting pipeline is connected with an air suction pipe of the compressor, and an electromagnetic valve is arranged on the defrosting pipeline; the method is characterized in that:
the defrosting control method comprises the following steps:
when the defrosting condition is met, the electromagnetic valve is controlled to be opened to start defrosting;
and controlling the opening degree of the electromagnetic valve according to the difference delta T between the condensation point temperature Tes and the surface temperature Te of the outdoor heat exchanger.
2. The defrosting control method of an air conditioner according to claim 1, wherein: the opening degree of the electromagnetic valve is controlled according to the difference value delta T between the condensation point temperature Tes and the surface temperature Te of the outdoor heat exchanger, and the method specifically comprises the following steps:
when the first set difference is not more than Delta T and less than the second set difference, the opening degree of the electromagnetic valve is the first set opening degree;
when the second set difference is less than or equal to the third set difference, the opening degree of the electromagnetic valve is the second set opening degree;
when the delta T is larger than or equal to a third set difference value, the opening degree of the electromagnetic valve is a third set opening degree;
wherein the first set opening degree is smaller than the second set opening degree and smaller than the third set opening degree.
3. The air conditioner defrost control method of claim 1, wherein: the defrosting control method further includes:
and controlling the frequency of the compressor according to the difference delta T between the condensation point temperature Tes and the surface temperature Te of the outdoor heat exchanger.
4. The air conditioner defrost control method of claim 3, wherein: the frequency of the compressor is controlled according to the difference value delta T between the condensation point temperature Tes and the surface temperature Te of the outdoor heat exchanger, and the method specifically comprises the following steps:
when the first set difference is less than or equal to the second set difference, the frequency of the compressor is increased by the first set frequency;
when the second set difference is less than or equal to the third set difference, the frequency of the compressor is increased by a second set frequency;
when the delta T is larger than or equal to a third set difference value, the frequency of the compressor is increased by a third set frequency;
wherein the first set frequency is less than the second set frequency and less than the third set frequency.
5. The air conditioner defrost control method of claim 1, wherein: the control method further comprises the following steps:
detecting the outdoor environment temperature after the air conditioner is started;
if the outdoor environment temperature is less than the first set outer ring temperature, the electromagnetic valve is opened; and after the electromagnetic valve is opened for the first set time, the electromagnetic valve is closed, and the air conditioner is heated and operated.
6. The defrosting control method of an air conditioner according to claim 1, wherein: the defrosting conditions are as follows: and in the heating state, the surface temperature Te of the outdoor heat exchanger is less than or equal to the condensation point temperature Tes for the second set time.
7. The defrosting control method of an air conditioner according to claim 1, wherein: the control method further comprises the following steps:
after the defrosting time reaches the minimum defrosting time, judging whether any one of the following conditions is met, and if any one of the following conditions is met, judging that the defrosting quitting condition is met, closing the electromagnetic valve and stopping defrosting;
(a) the surface temperature of the outdoor heat exchanger exceeds the first set temperature for a third set time;
(b) the surface temperature of the outdoor heat exchanger exceeds a second set temperature for a fourth set time;
(c) the defrosting time reaches the maximum defrosting time Tim;
wherein the third set time is more than the fourth set time, and the first set temperature is less than the second set temperature.
8. The air conditioner defrost control method of claim 7, wherein:
if k1 × T-k2 is not greater than the time threshold, the maximum defrost time Tim = the time threshold;
if k 1T-k 2 > time threshold, then maximum defrost time Tim = k 1T-k 2;
wherein k1 is more than 0 and less than 1, and k2 is more than 0 and less than or equal to 2; and T is the time interval between the starting time of the current defrosting and the ending time of the last defrosting.
9. The air conditioner defrost control method of any one of claims 1-8, wherein: the control method further comprises the following steps:
if the maximum defrost interval time T has been reached from the last defrost finish timeSpacerAnd then the electromagnetic valve is opened to start defrosting.
10. The air conditioner defrost control method of claim 9, wherein: said maximum defrost interval time TSpacerAccording to the outdoor ambient temperature TRing (C)And determining the accumulated running time of the compressor:
when the second set external ring temperature is less than or equal to TRing (C)< first set outer ring temperature, and the accumulated operating time of the compressor reaches the first set operating time, the maximum defrosting interval time TSpacerSetting the running time for the first time;
when the third set external ring temperature is less than or equal to TRing (C)The maximum defrosting interval time T is less than the second set external loop temperature and the accumulated operation time of the compressor reaches the second set operation timeSpacerSetting the running time for the second time;
when T isRing (C)< third set external loop temperature, and the accumulated operation time of the compressor reaches the third set operation time, the maximum defrosting interval time TSpacerSetting an operating time for the third;
wherein the first set operation time is less than the second set operation time and less than the third set operation time.
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