CN110736203A - Control method and control device for defrosting of air conditioner and air conditioner - Google Patents

Control method and control device for defrosting of air conditioner and air conditioner Download PDF

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Publication number
CN110736203A
CN110736203A CN201910911867.5A CN201910911867A CN110736203A CN 110736203 A CN110736203 A CN 110736203A CN 201910911867 A CN201910911867 A CN 201910911867A CN 110736203 A CN110736203 A CN 110736203A
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defrosting
refrigerant
air conditioner
attenuation
parameter
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CN110736203B (en
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许文明
罗荣邦
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Qingdao Haier Air Conditioner Gen Corp Ltd
Haier Smart Home Co Ltd
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Qingdao Haier Air Conditioner Gen Corp Ltd
Haier Smart Home Co Ltd
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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
    • 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
    • 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
    • F25B47/022—Defrosting cycles hot gas defrosting
    • 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
    • F25B2347/00—Details for preventing or removing deposits or corrosion
    • F25B2347/02—Details of defrosting cycles

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Thermal Sciences (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The control method provided by the embodiment of the disclosure can control and increase the refrigerant flow of the refrigerant circulation loop according to the air conditioner running bypass defrosting mode, and can reduce the high-temperature refrigerant flow for defrosting shunted by a defrosting bypass branch, thereby reducing the adverse effect of dual drop of temperature and flow of gaseous return refrigerant of a compressor caused by excessive refrigerant being used for defrosting.

Description

Control method and control device for defrosting of air conditioner and air conditioner
Technical Field
The present application relates to the field of air conditioner defrosting technologies, and for example, to control methods and control devices for air conditioner defrosting, and an air conditioner.
Background
With the development of science and technology, an air conditioner, which is kinds of necessary electrical equipment for ordinary people in daily life, has been gradually developed from the first single-cold machine type to an advanced machine type capable of having more functions of cooling, heating and defrosting, and here, important problems inevitably faced by air conditioning products operating in low-temperature areas or under windy and snowy weather conditions are the frosting problem of an air conditioner outdoor unit, an outdoor heat exchanger of the outdoor unit functions as an evaporator for absorbing heat from the outdoor environment, and is affected by the temperature and humidity of the outdoor environment in winter, much frost is easily condensed on the outdoor heat exchanger, and when the frost is condensed to , the heating capacity of the air conditioner is gradually lowered, so that in order to ensure the heating effect and avoid the frost from being condensed, the defrosting function gradually becomes important research subjects in the air conditioning field.
is a reverse circulation defrosting mode, when the air conditioner carries out reverse circulation defrosting, the high temperature refrigerant discharged by the compressor firstly flows through the outdoor heat exchanger to melt the frost by the heat of the refrigerant, and secondly, the bypass defrosting mode can convey the high temperature refrigerant discharged by the compressor to the outdoor heat exchanger through a bypass branch which is separately arranged when the air conditioner normally heats, and the purpose of melting the frost by the heat of the refrigerant can also be realized.
In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:
for the bypass defrosting mode, as a large amount of refrigerant directly flows to the outdoor heat exchanger for defrosting, the refrigerant after heat release is changed from a gaseous state to a liquid state, and meanwhile, the refrigerant evaporation function of the outdoor heat exchanger is inhibited, so that more and more liquid refrigerants and less gaseous refrigerants are contained in the refrigerant circulation loop of the air conditioner, the temperature and the flow of air return and suction of the compressor are reduced due to the step, and finally the defrosting capacity of the whole air conditioner is reduced along with the time.
Disclosure of Invention
This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments, but is intended to be a prelude to the more detailed description that is presented later.
The embodiment of the disclosure provides control methods and devices for defrosting of an air conditioner and the air conditioner, so as to solve the technical problem that the defrosting capacity of a bypass defrosting mode is reduced with time in the related art.
In embodiments, a control method for defrosting an air conditioner includes:
acquiring defrosting working parameters and defrosting attenuation parameters in the process of operating a bypass defrosting mode of the air conditioner; the bypass defrosting mode comprises the step of leading the refrigerant discharged by the compressor into the outdoor heat exchanger through a defrosting bypass branch;
determining whether the defrosting protection condition is met according to the defrosting working parameter and the defrosting attenuation parameter;
and under the condition that the defrosting working parameter and the defrosting attenuation parameter meet the defrosting protection condition, increasing the refrigerant flow of the refrigerant circulation loop.
In embodiments, a control apparatus for air conditioner defrosting includes a processor and a memory storing program instructions, the processor configured to execute, upon execution of the program instructions, a control method for air conditioner defrosting as in the previous embodiments .
In embodiments, an air conditioner includes:
the refrigerant circulating loop is formed by connecting an outdoor heat exchanger, an indoor heat exchanger, a throttling device and a compressor through refrigerant pipelines;
the defrosting bypass branch, wherein the end is communicated with the exhaust port of the compressor, and the end is communicated with a refrigerant liquid outlet pipeline of the outdoor heat exchanger in the heating mode;
the control device for defrosting the air conditioner as in the previous embodiments is electrically connected with the throttling device.
The control method and device for defrosting of the air conditioner and the air conditioner provided by the embodiment of the disclosure can achieve the following technical effects:
the control method for defrosting of the air conditioner can control and increase the refrigerant flow of the refrigerant circulation loop according to the defrosting attenuation parameter and the defrosting working parameter in the process of running the bypass defrosting mode of the air conditioner, and the power of the compressor is unchanged, so the refrigerant flow increase of the refrigerant circulation loop can reduce the high-temperature refrigerant flow which is branched by the defrosting bypass branch and used for defrosting, thereby reducing the adverse effect of double reduction of the temperature and the flow of the gaseous return air refrigerant of the compressor caused by the fact that excessive refrigerants are used for defrosting, and further reducing the problem that the defrosting capacity of the air conditioner is reduced along with the time caused by running the bypass defrosting mode.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
exemplary embodiments are illustrated by corresponding drawings, which are not to be construed as limiting the embodiments, in which elements having the same reference number designation are illustrated as similar elements, and in which:
fig. 1 is a schematic flowchart of a control method for defrosting an air conditioner according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a control device for defrosting an air conditioner according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of an air conditioner provided in an embodiment of the present disclosure.
Detailed Description
In the following description, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments, however, or more embodiments may be practiced without these details.
Fig. 1 is a schematic flow chart of a control method for defrosting an air conditioner according to an embodiment of the present disclosure.
As shown in FIG. 1, control methods for defrosting of an air conditioner are provided in the embodiments of the present disclosure, which can be used to solve the problem that the defrosting capability of the air conditioner gradually decreases after the air conditioner operates in a bypass defrosting mode under rainy or snowy or low-temperature and severe cold conditions, and in the embodiments, the main flow steps of the control method include:
s101, acquiring defrosting operating parameters and defrosting attenuation parameters in the process of operating a bypass defrosting mode of the air conditioner;
in an embodiment of the present disclosure, the bypass defrosting mode includes guiding the refrigerant discharged from the compressor into the outdoor heat exchanger through the defrosting bypass branch.
The refrigerant discharged from the compressor is a high-temperature refrigerant which is discharged from an exhaust port of the compressor and compressed by the compressor, and the refrigerant carries more heat, so that after the refrigerant is introduced into the outdoor heat exchanger, the heat of the refrigerant can be conducted to the shell of the outdoor heat exchanger, the temperature of the outdoor heat exchanger is increased, ice frost condensed on the outdoor heat exchanger is melted by absorbing heat, and the purpose of defrosting the outdoor heat exchanger is achieved.
In the air-conditioning structures applied in the embodiment of the disclosure, the end of the defrosting bypass branch is connected in parallel to the exhaust port of the compressor, and the other end is connected to the refrigerant inlet end of the outdoor heat exchanger in the heating mode.
In the embodiment of the disclosure, after the air conditioner enters the bypass defrosting mode, the flow direction of the refrigerant defined by the heating mode is still kept unchanged, that is, the heating mode and the bypass defrosting mode of the air conditioner are performed simultaneously, so that parts of the refrigerant discharged by the compressor are used for defrosting, and other parts of the refrigerant can still flow in the refrigerant circulation loop, thereby ensuring the heating and warming effects on the indoor environment defined by the heating mode.
In , the defrost decay parameter obtained in step S101 is the decay amount or decay rate of the indoor ambient temperature.
In the process of the bypass defrosting mode in the air conditioner operation step S101, since a large amount of refrigerant directly flows to the outdoor heat exchanger for defrosting, the amount of refrigerant flowing to the indoor heat exchanger through the refrigerant circulation circuit and releasing heat to the indoor environment decreases, and therefore, the execution of the bypass defrosting mode is often accompanied by a change in the indoor environment temperature.
In alternative embodiments of the present disclosure, the indoor unit of the air conditioner is provided with a temperature sensor, which can be used to detect the temperature of the indoor environment in which the indoor unit is located, therefore, in the embodiment of the present disclosure, the attenuation amount or attenuation rate of the indoor environment temperature is determined according to the temperature data detected by the temperature sensor.
In other embodiments, the defrost decay parameter obtained in step S101 is the decay amount or decay rate of the coil temperature of the indoor heat exchanger.
Here, the decrease in the temperature and the flow rate of the refrigerant caused by the bypass defrosting mode can directly affect the temperature change at the coil position of the indoor heat exchanger. Therefore, the attenuation amount or the attenuation rate of the coil temperature can also be selected as the reference parameter for controlling and adjusting in the subsequent steps.
In alternative embodiments of the present disclosure, the indoor heat exchanger is provided with temperature sensors at the coil positions, which can be used to detect the real-time temperature of the coil, therefore, the temperature data of the coil detected by the temperature sensors is used to determine the attenuation amount or attenuation rate of the coil temperature in the disclosed embodiment.
It should be understood that the defrost decay parameters of the present application include, but are not limited to, the indoor ambient temperature or the coil temperature of the indoor heat exchanger shown in the above embodiments; other air conditioner parameters with attenuation change under the influence of the bypass defrosting mode in the process of operating the air conditioner in the defrosting bypass mode also should be covered in the protection scope of the technical scheme of the application.
In , the defrosting operation parameter obtained in step S101 is the current defrosting time period of the bypass defrosting mode.
The air conditioner is provided with a timing module, and the timing module can be used for timing in the process of running the bypass defrosting mode of the air conditioner; therefore, the current defrosting time period obtained in step S101 is the time period data recorded by the timer module.
Here, when the air conditioner exits the bypass defrosting mode, the current timing length of the timing module is cleared to restart timing when the air conditioner enters the bypass defrosting mode times, thereby improving the accuracy of control.
S102, determining whether a defrosting protection condition is met according to the defrosting working parameter and the defrosting attenuation parameter;
optionally, when the defrost attenuation parameter obtained in step S101 is the attenuation amount or the attenuation rate of the indoor ambient temperature, the defrost protection condition may be set to any conditions, such as (1) △ TIndoor useT1 of not less than △Defrosting≥tThreshold value；(2)VIndoor useNot less than V1, and tDefrosting≥tThreshold value；(3)△TIndoor use≥△T1，VIndoor useT is not less than V1Defrosting≥tThreshold valueWherein, △ TIndoor use th attenuation amount of indoor environment temperature, △ T1 is th temperature attenuation threshold value, VIndoor use th rate of decay for indoor ambient temperature, V1 is th rate decay threshold, tDefrostingFor the current defrost duration of the bypass defrost mode, tThreshold valueIs a duration threshold.
In the above embodiment, the attenuation amount or attenuation rate of the indoor environment temperature is mainly adopted, compared with the data between the corresponding temperature thresholds, and combined with the numerical comparison between the current defrosting time and the time threshold thereof, the attenuation amount or attenuation rate is used as the defrosting protection condition, here, the temperature attenuation threshold and the rate attenuation threshold are used as the limit values for measuring the influence of the bypass defrosting mode of the air conditioner on the indoor environment temperature, when the attenuation amount of the indoor environment temperature is higher than the temperature attenuation threshold, or the attenuation rate of the indoor environment temperature is higher than the rate attenuation threshold, the influence of the bypass defrosting mode on the performance of the compressor is larger, and then the influence of the bypass defrosting mode on the temperature of the indoor environment is larger, the current and subsequent defrosting capabilities of the air conditioner are reduced greatly, otherwise, the current and subsequent defrosting capabilities of the air conditioner can still be kept in a better state.
Optionally, when the defrost attenuation parameter obtained in step S101 is the attenuation amount or the attenuation rate of the indoor ambient temperature, the defrost protection condition may be set to any conditions, such as (1) △ TCoil pipeT2 of not less than △Defrosting≥tThreshold value；(2)VCoil pipeNot less than V2, and tDefrosting≥tThreshold value；(3)△TCoil pipe≥△T2，VCoil pipeT is not less than V2Defrosting≥tThreshold valueWherein, △ TCoil pipeA second attenuation amount of the coil temperature of the indoor heat exchanger, △ T2 is a second temperature attenuation threshold value, VCoil pipeIs a second decay rate of the coil temperature of the indoor heat exchanger, and V2 is a second rate decay threshold.
In the above optional embodiment, the attenuation amount or attenuation rate of the coil temperature of the indoor heat exchanger is mainly used, and is compared with the data between the corresponding temperature thresholds, and the comparison of the current defrosting time length and the time length threshold is combined to be used as the defrosting protection condition.
Here, when the defrost attenuation parameter acquired in step S101 is another air conditioning parameter, the defrost protection condition may also be set with reference to the above-described embodiment, and the present invention is not limited thereto.
And S103, under the condition that the defrosting working parameter and the defrosting attenuation parameter meet the defrosting protection condition, increasing the refrigerant flow of the refrigerant circulation loop.
Optionally, in step S103, under the condition that it is determined that the defrosting operation parameter and the defrosting attenuation parameter do not satisfy the defrosting protection condition in step S102, the current operating state of the air conditioner is kept unchanged; alternatively, the process returns to step S101.
In the embodiment of the present disclosure, when it is determined in step S103 that the defrosting operation parameter and the defrosting attenuation parameter satisfy the defrosting protection condition, the refrigerant flow rate of the refrigerant circulation circuit is increased. Here, the refrigerant flow rate of the refrigerant circulation circuit is increased, so that the flow rate of the high-temperature refrigerant for defrosting branched by the defrosting bypass branch can be reduced, the adverse effect of dual drop of the temperature and the flow rate of the gaseous return air refrigerant of the compressor caused by excessive refrigerant used for defrosting is reduced, and the problem of the reduction of the defrosting capacity of the air conditioner caused by the operation of the bypass defrosting mode along with the time is reduced.
Optionally, a throttling device is disposed on the refrigerant circulation loop in the embodiment of the disclosure, and the throttling device may be used to control the adjustment of the refrigerant flow flowing through the refrigerant circulation loop. Therefore, in step S103, when it is determined that the defrosting operation parameter and the defrosting decay parameter satisfy the defrosting protection condition, the flow opening of the throttling device may be controlled to be increased, so as to increase the flow rate of the refrigerant flowing through the refrigerant circulation circuit.
Alternatively, the throttle device may be an electronic expansion valve, or another valve having an opening degree adjusting function as well.
In another embodiment , in the refrigerant circulation circuit using the capillary tube as the throttling device, since the capillary tube itself does not have a flow rate adjusting function, a electronic expansion valve may be added to the refrigerant circulation circuit to adjust the flow rate opening of the refrigerant circulation circuit through the electronic expansion valve.
In , in some alternative embodiments, the refrigerant flow rate of the refrigerant circulation circuit may be increased in step S103 by increasing the flow rate opening of the electronic expansion valve by a predetermined fixed flow rate opening, where the predetermined fixed flow rate opening is, for example, 30B or 50B.
The mode of increasing the refrigerant flow by the preset fixed flow opening degree is simple to operate and convenient to use; however, it still has the disadvantage that the control method is too rough.
In still alternative embodiments, the present application provides more accurate technical solutions for controlling the flow rate of the refrigerant in the refrigerant circulation loop.
When the refrigerant flow of the refrigerant circulation loop is adjusted within the adjusting range value, the indoor environment temperature corresponding to the air conditioner is within a set temperature range; therefore, after the refrigerant flow of the refrigerant circulation loop is increased and adjusted, the indoor environment temperature is still in the set temperature range, so that the large disturbance influence of the flow adjustment operation on the indoor environment temperature is avoided, and the comfort level of indoor users is ensured.
Alternatively, the set temperature range is a temperature range determined by taking the target heating temperature set by the current user as a central value, for example, if the target heating temperature set by a certain user is 26 ℃, the set temperature range may be set to 24 ℃ to 28 ℃.
And adjusting the refrigerant flow of the refrigerant circulation circuit according to the target adjusting value determined from the adjusting range, namely achieving the effect of recovering or improving the defrosting capacity of the air conditioner, and ensuring the comfort level of a user to a certain extent at .
In alternative embodiments, determining the target adjustment value from the adjustment range values of the refrigerant flow rate includes obtaining a corresponding target adjustment value from the adjustment range values according to the correlation relationship based on the defrost attenuation parameter.
Wherein the th correlation includes correspondence of or more defrost decay parameters to adjustment values in the adjustment range values.
Therefore, the step of determining the target adjustment value of the refrigerant flow rate in the embodiment of the disclosure is a closed-loop feedback control manner, which has high control accuracy and fast response speed.
Optionally, the defrost attenuation parameter for obtaining the corresponding target adjustment value from the adjustment range value includes the attenuation amount or attenuation rate of the indoor ambient temperature shown in the previous embodiment, or the attenuation amount or attenuation rate of the coil temperature of the indoor heat exchanger.
Optionally, when the defrosting attenuation parameter is the th attenuation amount or the th attenuation rate of the indoor ambient temperature, the corresponding th target adjustment value may be obtained from the th defrosting attenuation association relationship according to the th attenuation amount or the th attenuation rate of the indoor ambient temperature.
Here, the th defrost attenuation relationship includes or more th attenuation amounts △ TIndoor useCorresponding relation with th target regulating value, or, alternatively, or more th decay rates VIndoor useCorresponding relation with th target regulating value exemplarily, optional △ T are shown in Table 1Indoor useCorresponding to the th target adjustment value, as shown in the following table,
TABLE 1
△TIndoor use(unit:. degree.C.) Target regulation value (unit: B) of
a1＜△TIndoor use≤a2 K11
a2＜△TIndoor use≤a3 K12
a3＜△TIndoor use K13
In the corresponding relation, th target regulating value and △ TIndoor useIs positively correlated, i.e. △ TIndoor useThe larger the value of (b) is, the larger the temperature change of the indoor environment is, the larger the adverse effect of the bypass defrosting mode on the indoor environment is, and the larger the defrosting capacity attenuation of the bypass defrosting mode is, so that the higher the value of the target adjustment value is set to increase the refrigerant quantity of the refrigerant circulation circuit, so that most of the refrigerant can flow through the compressor through the refrigerant circulation circuit for heating, thereby increasing the temperature and the flow rate of the refrigerant flowing back to the compressor as soon as possible to improve the current performance of the compressor.
Therefore, when the operation of increasing the refrigerant flow rate of the refrigerant circulation circuit defrosting bypass branch in step S103 is performed, the target adjustment value may be determined according to the -th defrosting attenuation correlation, and then the refrigerant flow rate of the refrigerant circulation circuit may be adjusted according to the -th target adjustment value.
optionally, when the defrost attenuation parameter is the second attenuation amount or the second attenuation rate of the coil temperature, the corresponding second target adjustment value may be obtained from the second defrost attenuation correlation according to the second attenuation amount or the second attenuation rate of the coil temperature.
Here, the second defrost decayThe decorrelation relationship includes or more second attenuation amounts △ TCoil pipeA correspondence with a second target adjustment value, or, alternatively, or more second decay rates VCoil pipeExemplary, alternative △ T are shown in Table 2Coil pipeThe correspondence with the second target adjustment value, as shown in the following table,
TABLE 2
△TCoil pipe(unit:. degree.C.) Second target adjustment value (unit: B)
b1＜△TCoil pipe≤b2 K21
b2＜△TCoil pipe≤b3 K22
b3＜△TCoil pipe K23
In the corresponding relationship, the second target adjustment value is △ TCoil pipeIs positively correlated, i.e. △ TCoil pipeThe larger the value of the target adjustment value is, the larger the temperature change of the coil of the indoor heat exchanger is, the larger the adverse effect of the bypass defrosting mode on the heating performance of the indoor heat exchanger is, and the larger the attenuation of the defrosting capacity of the bypass defrosting mode is, so that the higher the value of the second target adjustment value is set to increase the amount of the refrigerant passing through the refrigerant circulation loop, and the purpose of improving the current performance of the compressor can be achieved.
Therefore, when the operation of increasing the refrigerant flow rate of the refrigerant circulation loop defrosting bypass branch in step S103 is performed, the second target adjustment value may be determined according to the second defrosting attenuation correlation, and then the refrigerant flow rate of the refrigerant circulation loop may be adjusted according to the second target adjustment value.
In the above embodiments, the present application is provided with individual correlations, and the air conditioner may select kinds of defrost attenuation correlations to determine corresponding heating parameters according to actual needs.
Optionally, the specifically selected rate association relationship may be determined according to the current cold and heat load of the air conditioner, for example, when the current cold and heat load of the air conditioner is low, the th defrost attenuation association relationship is selected, and the indoor environment temperature is mainly used as a reference factor, and when the current cold and heat load of the air conditioner is high, the second defrost attenuation association relationship is selected, and at this time, it is mainly considered that the higher cold and heat load also has a greater influence on the system pressure of the air conditioner, so that in order to ensure the temperature operation of the air conditioner, the coil temperature of the indoor heat exchanger is used as a reference factor.
Here, the level of the cooling and heating load of the current air conditioner can be determined by parameters such as the indoor ambient temperature and the outdoor ambient temperature, for example, the air conditioner is preset with indoor temperature threshold values, when the indoor ambient temperature is less than the indoor temperature threshold value, the cooling and heating load of the air conditioner is higher, and when the indoor ambient temperature is greater than or equal to the indoor temperature threshold value, the cooling and heating load of the air conditioner is lower.
Of course, the air conditioning cooling and heating load may be determined by calculation of the cooling and heating load as in the related art, and further, which of the above-described defrosting attenuation correlations is used may be determined according to the specifically obtained cooling and heating load.
Therefore, in the embodiment of the disclosure, the heating operation of the air conditioner for the liquid outlet refrigerant of the outdoor heat exchanger can be triggered according to the performance change of the air conditioner compressor in the bypass defrosting process, and meanwhile, the influence of cold and hot loads on the air conditioning system can be considered, so that the accuracy of air conditioner control is improved, and the operation stability of the air conditioner is guaranteed.
In optional embodiments, the control method for defrosting of an air conditioner further includes controlling to heat the liquid refrigerant of the outdoor heat exchanger when it is determined that the defrosting operation parameter and the defrosting attenuation parameter satisfy the defrosting protection condition.
Here, the liquid refrigerant that is heat-released and liquefied in the outdoor heat exchanger in the bypass defrosting mode can absorb heat and vaporize again by heating the liquid refrigerant of the outdoor heat exchanger, so that the temperature and the flow rate of the gaseous refrigerant in the refrigerant that flows back to the compressor can be effectively increased, and further the temperature and the flow rate of the gaseous refrigerant of the refrigerant discharged by the compressor can be increased.
Optionally, an heating device is disposed in the refrigerant outlet pipe of the outdoor heat exchanger of the air conditioner, and the heating device is configured to controllably heat the refrigerant flowing through the refrigerant outlet pipe, so that the heating device can be controlled to be turned on when the defrost attenuation parameter satisfies the defrost protection condition, and the heating device is kept to be turned off when the defrost attenuation parameter does not satisfy the defrost protection condition.
In , the heating parameter for controlling heating of the outlet refrigerant of the outdoor heat exchanger is obtained according to the defrost attenuation parameter or the defrost working parameter.
Optionally, the defrost decay parameter includes the decay amount or decay rate of the indoor ambient temperature, or the decay amount or decay rate of the coil temperature of the indoor heat exchanger, shown in the previous embodiments; the defrost operating parameters include a defrost operating parameter including a current defrost duration for the bypass defrost mode.
The step of obtaining the heating parameter according to the defrost attenuation parameter includes obtaining a corresponding heating parameter from a third defrost attenuation correlation according to the defrost attenuation parameter, where the third defrost attenuation correlation includes corresponding relationship between one or more defrost attenuation parameters and the heating parameter.
Similarly, the step of obtaining the heating parameters according to the defrosting operation parameters comprises obtaining corresponding heating parameters from the defrosting operation association relationship according to the defrosting operation parameters, wherein the defrosting operation association relationship comprises corresponding relationships between one or more defrosting operation parameters and the heating parameters.
The embodiment of the disclosure heats the liquid refrigerant of the outdoor heat exchanger according to the heating parameter control, the heating parameter setting of the heating mode is more flexible, and the current defrosting working condition can be adapted, so that the accurate control of the liquid refrigerant heating can be realized, and meanwhile, the method and the device also have the advantages of energy saving and consumption reduction.
In alternative embodiments, the control method for defrosting an air conditioner further includes controlling to stop heating the liquid refrigerant of the outdoor heat exchanger when it is determined that the defrosting operation parameter and the defrosting attenuation parameter do not satisfy the defrosting protection condition.
Here, when the defrost decay parameter does not satisfy the defrost protection condition, it is described that the bypass defrost mode of the current operation of the air conditioner is restored to the defrost capacity capable of satisfying the current defrost requirement for the outdoor heat exchanger, and therefore, the heating of the outlet refrigerant of the outdoor heat exchanger is controlled to be stopped, so as to reduce the power resource consumed by maintaining the continuous operation of the heating device.
In optional embodiments, the control method for air conditioner defrosting further includes, under the condition that it is determined that the defrosting operation parameter and the defrosting attenuation parameter satisfy the defrosting protection condition, obtaining the defrosting protection condition corresponding to the next times of entering the bypass defrosting mode from the condition set, wherein the threshold value in the defrosting protection condition corresponding to the next times of entering the bypass defrosting mode is smaller than the threshold value corresponding to the current defrosting protection condition.
Here, the air conditioning control system of the present application stores condition sets, condition set packagesIncluding multiple defrost protection conditions using different combinations of threshold settings, e.g. wherein defrost protection conditions A are △ TIndoor useT11 of not less than △Defrosting≥t1Threshold valueWherein another defrosting protection conditions B are △ TIndoor useT12 of not less than △Defrosting≥t2Threshold valueOf the above set of conditions, △ T11 is less than △ T12, T1Threshold valueLess than t2Threshold valueTherefore, for example, in the current control flow, the defrosting protection condition a is used to control whether to heat the liquid outlet refrigerant of the outdoor heat exchanger, and when the defrosting operation parameter and the defrosting attenuation parameter satisfy the defrosting protection condition, optionally, the defrosting protection condition corresponding to the next times of entering the bypass defrosting mode is selected as the defrosting protection condition B.
In the embodiment of the disclosure, the threshold value in the defrosting protection condition corresponding to the next times of entering the bypass defrosting mode is smaller than the threshold value corresponding to the current defrosting protection condition, so that the heating operation on the liquid outlet refrigerant of the outdoor heat exchanger can be triggered more easily when the bypass defrosting mode is entered times, the disturbance influence on the indoor environment temperature under the condition that the bypass defrosting mode is continuously and repeatedly triggered is reduced, the defrosting capability of the air conditioner in the process of repeatedly running the bypass defrosting mode can be improved more timely and rapidly, and the defrosting effect is ensured.
Fig. 2 is a schematic structural diagram of a control device for defrosting an air conditioner according to an embodiment of the present disclosure.
The embodiment of the present disclosure provides control devices for defrosting of an air conditioner, the structure of which is shown in fig. 3, including:
a processor (processor)200 and a memory (memory)201, and may further include a Communication Interface (Communication Interface)202 and a bus 203. The processor 200, the communication interface 202 and the memory 201 can communicate with each other through the bus 203. The communication interface 202 may be used for information transfer. The processor 200 may call logic instructions in the memory 201 to perform the control method for defrosting the air conditioner of the above embodiment.
Furthermore, the logic instructions in the memory 201 may be stored in computer readable storage media when implemented in software functional units and sold or used as independent products.
The processor 200 executes functional applications and data processing by executing the program instructions/modules stored in the memory 201, namely, implements the control method for defrosting the air conditioner in the above method embodiment.
The memory 201 may include a program storage area that may store an operating system, application programs necessary for at least functions, and a data storage area that may store data created according to the use of the terminal device, etc.
Fig. 3 is a schematic structural diagram of an air conditioner provided in an embodiment of the present disclosure.
As shown in fig. 3, the disclosed embodiments further provide air conditioners, including:
the refrigerant circulation loop is formed by connecting an outdoor heat exchanger 11, an indoor heat exchanger 12, a throttling device 13 and a compressor 14 through refrigerant pipelines;
the defrosting bypass branch 21, end is connected with the exhaust port of the compressor 14, another end is connected with the refrigerant outlet pipe of the outdoor heat exchanger 11 under the heating mode, the defrosting bypass branch 21 is provided with a control valve 22;
and a control device (not shown in the figure) for defrosting the air conditioner is electrically connected with the throttling device 13. Here, the control device for air conditioner defrosting is the control device shown in the foregoing embodiment.
The air conditioner adopting the structural design can control and increase the refrigerant flow of the refrigerant circulation loop according to the defrosting attenuation parameter and the defrosting working parameter in the process of the bypass defrosting mode of the air conditioner running, and the refrigerant flow of the refrigerant circulation loop is increased due to the unchanged power of the compressor, so that the high-temperature refrigerant flow which is branched by the defrosting bypass branch and used for defrosting can be reduced, the adverse effect of dual reduction of the temperature and the flow of the gaseous return air refrigerant of the compressor caused by the fact that excessive refrigerants are used for defrosting is reduced, and the problem that the defrosting capacity of the air conditioner is reduced along with the time caused by the bypass defrosting mode running is further reduced.
The disclosed embodiments also provide computer-readable storage media storing computer-executable instructions configured to perform the above-described method for air conditioner defrosting.
The disclosed embodiments also provide computer program products comprising a computer program stored on a computer readable storage medium, the computer program comprising program instructions that, when executed by a computer, cause the computer to perform the above-described method for air conditioner defrosting.
The computer-readable storage medium described above may be a transitory computer-readable storage medium or a non-transitory computer-readable storage medium.
The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product, where the computer software product is stored in storage media, and includes or more instructions to enable computer devices (which may be personal computers, servers, or network devices) to execute all or part of the steps of the method described in the embodiment of the present disclosure.
The above description and drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them, other embodiments may include structural, logical, electrical, procedural and other changes, the embodiments represent only possible changes unless explicitly claimed, individual components and features are optional and the order of operation may vary, the scope of the embodiments of the disclosure includes the full scope of the claims and all available equivalents of the claims, when used in this application, although the terms "", "second" and the like may be used in this application to describe elements without limitation to these terms, these terms are used only to distinguish elements from elements, for example, the term 2 may be called a second element and, as such, the term " may be used only to distinguish between" elements "and" elements "if used without change in the meaning of the description," the term "is used in conjunction with" 4642 "or" may be used in "a" or "a" element "may be used in conjunction with" a "or" where "a" element is included in a "or included in the singular form of the embodiment" (or included in addition to the element, or included in a "component equivalent," and/or "may be included in a" disclosed "a" and/or "element).
Those of skill in the art would appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software may depend upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments. It can be clearly understood by the skilled person that, for convenience and brevity of description, the specific working processes of the system, the apparatus and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be only logical functional divisions, and in actual implementation, there may be other divisions, for example, multiple units or components may be combined or may be integrated into another systems, or features may be omitted or not executed.
The flowcharts and block diagrams in the figures may represent blocks, program segments, or portions of code which contain or more executable instructions for implementing specified logical functions, in some alternative implementations, the functions noted in the blocks may occur out of the order noted in the figures.

Claims (10)

1, A control method for defrosting of air conditioner, which is characterized by comprising:
acquiring defrosting working parameters and defrosting attenuation parameters in the process of operating a bypass defrosting mode of the air conditioner; the bypass defrosting mode comprises the step of guiding a refrigerant discharged by the compressor into the outdoor heat exchanger through a defrosting bypass branch;
determining whether a defrosting protection condition is met according to the defrosting working parameter and the defrosting attenuation parameter;
and under the condition that the defrosting working parameter and the defrosting attenuation parameter are determined to meet the defrosting protection condition, increasing the refrigerant flow of the refrigerant circulation loop.
2. The control method according to claim 1, further comprising, before increasing the refrigerant flow rate of the refrigerant circulation circuit:
acquiring an adjusting range value of the refrigerant flow; when the refrigerant flow of the refrigerant circulation loop is adjusted within the adjusting range value, the indoor environment temperature corresponding to the air conditioner is within a set temperature range;
and determining a target adjusting value from the adjusting range value of the refrigerant flow, wherein the target adjusting value is used for representing the adjusting range of increasing the refrigerant flow of the refrigerant circulation loop.
3. The control method according to claim 2, wherein the determining a target adjustment value from the adjustment range value of the refrigerant flow rate comprises:
acquiring a corresponding target adjusting value from the adjusting range value according to the defrosting attenuation parameter and an association relation;
wherein the th correlation comprises a correspondence of or more defrost decay parameters to adjustment values of the adjustment range values.
4. The control method according to claim 1, characterized by further comprising:
and under the condition that the defrosting working parameter and the defrosting attenuation parameter are determined to meet the defrosting protection condition, controlling to heat the liquid outlet refrigerant of the outdoor heat exchanger.
5. The control method according to claim 4, wherein the heating parameter for controlling heating of the outlet refrigerant of the outdoor heat exchanger is obtained according to the defrost attenuation parameter or the defrost working parameter.
6. The control method according to claim 4, characterized by further comprising:
and under the condition that the defrosting working parameter and the defrosting attenuation parameter are determined not to meet the defrosting protection condition, controlling to stop heating the liquid outlet refrigerant of the outdoor heat exchanger.
7. The control method of wherein the defrost decay parameter comprises a decay amount or a decay rate of the indoor ambient temperature or a second decay amount or a second decay rate of the indoor heat exchanger coil temperature;
the defrost protection conditions include:
△Tindoor use≥△T1，VIndoor use≥V1，△TCoil pipeNot less than △ T2, or VCoil pipe≥V2；
And t isDefrosting≥tThreshold value；
Wherein, △ TIndoor useThe th attenuation amount of the indoor environment temperature is △ T1 is the th temperature attenuation threshold value VIndoor use th decay rate of the indoor ambient temperature, V1 is th rate decay threshold, △ TCoil pipeA second attenuation amount of the coil temperature of the indoor heat exchanger, △ T2 is a second temperature attenuation threshold value, VCoil pipeA second decay rate for the coil temperature of the indoor heat exchanger, V2 being a second rate decay threshold; t is tDefrostingIs the current defrost duration, t, of the bypass defrost modeThreshold valueIs a duration threshold.
8. The control method according to claim 7, characterized by further comprising:
under the condition that the defrosting working parameter and the defrosting attenuation parameter are determined to meet the defrosting protection condition, the defrosting protection condition corresponding to the bypass defrosting mode is obtained from a condition set for times;
wherein, the threshold value of the defrosting protection condition corresponding to the lower times of entering the bypass defrosting mode is smaller than the corresponding threshold value of the current defrosting protection condition.
A control device for air conditioner defrosting comprising a processor and a memory storing program instructions, characterized in that the processor is configured to execute the control method for air conditioner defrosting as claimed in any of claims 1 to 8 and when executing the program instructions.
10, air conditioner, characterized by that, includes:
the refrigerant circulating loop is formed by connecting an outdoor heat exchanger, an indoor heat exchanger, a throttling device and a compressor through refrigerant pipelines;
the defrosting bypass branch, wherein the end is communicated with the exhaust port of the compressor, and the end is communicated with the refrigerant outlet pipeline of the outdoor heat exchanger in the heating mode;
a control for defrosting an air conditioner in accordance with claim 9, electrically connected to said throttling means.
CN201910911867.5A 2019-09-25 2019-09-25 Control method and control device for defrosting of air conditioner and air conditioner Active CN110736203B (en)

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