CN110736208B - 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
CN110736208B
CN110736208B CN201910917974.9A CN201910917974A CN110736208B CN 110736208 B CN110736208 B CN 110736208B CN 201910917974 A CN201910917974 A CN 201910917974A CN 110736208 B CN110736208 B CN 110736208B
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Prior art keywords
defrosting
refrigerant
exhaust
air conditioner
temperature
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CN110736208A (en
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许文明
罗荣邦
王飞
于文文
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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)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Signal Processing (AREA)
  • Thermal Sciences (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The application relates to the technical field of air conditioner defrosting, and discloses a control method for air conditioner defrosting. The control method comprises the following steps: after the air conditioner enters a bypass defrosting mode, acquiring defrosting attenuation parameters; and when the defrosting attenuation parameter meets the defrosting protection condition, reducing the refrigerant flow of the defrosting bypass branch. The control method provided by the embodiment of the disclosure can control and reduce the refrigerant flow of the defrosting bypass branch under the condition that the air conditioner enters the bypass defrosting mode, so as to reduce the high-temperature refrigerant flow which is branched by the defrosting bypass branch and is 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 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 the operation of the bypass defrosting mode. The application also discloses a controlling means and air conditioner for the air conditioner 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 a control method and a control device for air conditioner defrosting, and an air conditioner.
Background
With the development of science and technology, an air conditioner, which is a necessary electrical appliance for ordinary people's daily life, has been gradually developed from an initial single-cooling type to an advanced type capable of having more functions such as cooling, heating and defrosting, and here, an important problem inevitably faced by air-conditioning products operating in low-temperature areas or in climates with heavy wind and snow is the problem of frosting of the outdoor unit of the air conditioner, the 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, and much frost is easily condensed on the outdoor heat exchanger, when the frost is formed to a certain thickness, the heating capacity of the air conditioner will be lower and lower, so the defrosting function is also an important research topic in the air conditioning field gradually in order to ensure the heating effect and avoid excessive frost condensation.
In the prior art, the defrosting mode of the outdoor heat exchanger mainly comprises the following modes: firstly, in a reverse cycle defrosting mode, when the air conditioner performs reverse cycle defrosting, a high-temperature refrigerant discharged by a compressor firstly flows through an outdoor heat exchanger so as to melt frost by using the heat of the refrigerant; and secondly, a bypass defrosting mode is adopted, when the air conditioner is in normal heating operation, the high-temperature refrigerant discharged by the compressor can be conveyed to the outdoor heat exchanger through the independently arranged bypass branch, and the purpose of melting frost by using 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 refrigerants directly flow to the outdoor heat exchanger for defrosting, the refrigerants after heat release are changed from gaseous state to 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 flow of returned air and sucked air of the compressor are further reduced, and finally the defrosting capacity of the whole air conditioner is reduced along with time.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.
The embodiment of the disclosure provides a control method and a control device for defrosting of an air conditioner and the air conditioner, so as to solve the technical problem that defrosting capacity of a bypass defrosting mode is reduced along with time in the related art.
In some embodiments, a control method for defrosting an air conditioner includes:
after the air conditioner enters a bypass defrosting mode, acquiring defrosting attenuation parameters; 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;
and when the defrosting attenuation parameter meets the defrosting protection condition, reducing the refrigerant flow of the defrosting bypass branch.
In some embodiments, a control apparatus for defrosting an air conditioner includes: a processor and a memory storing program instructions, the processor being configured to, when executing the program instructions, perform a control method for air conditioner defrosting as in some of the foregoing embodiments.
In some 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;
one end of the defrosting bypass branch is communicated with an exhaust port of the compressor, and the other end of the defrosting bypass branch is communicated with a refrigerant liquid inlet pipeline of the outdoor heat exchanger in the heating mode; the defrosting bypass branch is provided with a control valve;
the control device for defrosting the air conditioner as in the previous embodiments is electrically connected with the control valve.
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 provided by the embodiment of the disclosure can control and reduce the refrigerant flow of the defrosting bypass branch according to the defrosting attenuation parameter and the defrosting protection condition under the condition that the air conditioner enters the bypass defrosting mode, so as to reduce the high-temperature refrigerant flow which is branched by the defrosting bypass branch and is used for defrosting, thereby reducing the adverse effect of dual reduction of the temperature and the flow of the gaseous return air refrigerant of the compressor caused by excessive refrigerant used for defrosting, and further reducing the problem of reduction of the defrosting capacity of the air conditioner caused by running the bypass defrosting mode along with time.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:
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
So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.
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, the embodiment of the present disclosure provides a control method for defrosting an air conditioner, 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; in an embodiment, the main flow steps of the control method include:
s101, acquiring defrosting attenuation parameters after the air conditioner enters a bypass defrosting mode;
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 some air conditioning structures applied to the embodiment of the disclosure, one end of the defrosting bypass branch is connected in parallel to the exhaust port of the compressor, and the other end of the defrosting bypass branch is connected to the refrigerant inlet end of the outdoor heat exchanger in the heating mode. In this way, since the refrigerant pressure at the discharge port of the compressor is high, part of the refrigerant discharged from the compressor flows from the discharge port of the compressor to the refrigerant inlet end of the outdoor heat exchanger along the defrosting bypass branch, and the refrigerant flows into the outdoor heat exchanger together after being mixed with the refrigerant flowing in the refrigerant circulation circuit at the refrigerant inlet end.
In the embodiment of the disclosure, after the air conditioner enters the bypass defrosting mode, the air conditioner still keeps the flow direction of the refrigerant limited by the heating mode unchanged, that is, the heating mode and the bypass defrosting mode of the air conditioner are performed simultaneously; therefore, except for one part of the refrigerant discharged by the compressor for defrosting, other parts of the refrigerant can still continue to flow in the refrigerant circulating loop, and the heating and temperature rising effects on the indoor environment limited by the heating mode are ensured.
In some embodiments, the defrost decay parameter obtained in step S101 is a return air parameter of the compressor.
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 refrigerant after heat release changes from a gaseous state to a liquid state, and the refrigerant evaporation function of the outdoor heat exchanger is suppressed, so that the liquid refrigerant and the gaseous refrigerant in the air conditioner refrigerant circulation loop are increased, and the return air temperature and the return air flow rate of the compressor are reduced. Therefore, the change of the return air parameter of the compressor can reflect the change influence of the performance parameter of the air conditioner compressor caused by the progress of the bypass defrosting mode to a certain extent. Therefore, in the embodiment of the present disclosure, the return air parameter of the compressor is used as a reference parameter for control adjustment in the subsequent step.
Here, the return air parameter of the compressor includes a return air temperature of the compressor, and/or a return air pressure.
In some optional embodiments of the present disclosure, a temperature sensor is disposed at the air return end of the compressor, and the temperature sensor may be configured to detect a real-time temperature of the refrigerant flowing through the air return end of the compressor; therefore, in the embodiment of the present disclosure, the real-time temperature of the refrigerant detected by the temperature sensor is used as the return air temperature of the compressor.
Similarly, the air return end of the compressor is provided with a pressure sensor which can be used for detecting the real-time pressure of the refrigerant flowing through the air return end of the compressor; therefore, in the embodiment of the present disclosure, the real-time pressure of the refrigerant detected by the pressure sensor is used as the return pressure of the compressor.
In other embodiments, the defrost decay parameter obtained in step S101 is a discharge parameter of the compressor.
Here, when the compression power of the compressor is not changed, and the air return parameter of the compressor is negatively affected by the bypass defrosting mode, and the air discharge parameter of the compressor is also decreased, so that the change of the air discharge parameter of the compressor can reflect the change influence of the performance parameter of the air conditioner compressor caused by the proceeding of the bypass defrosting mode to a certain extent. Therefore, the embodiments of the present disclosure may also select the discharge parameter of the compressor as the reference parameter for performing the control adjustment in the subsequent step.
Here, the discharge parameter of the compressor includes a discharge temperature of the compressor, and/or a discharge pressure.
In some optional embodiments of the present disclosure, the discharge end of the compressor is provided with a temperature sensor, and the temperature sensor may be configured to detect a real-time temperature of the refrigerant flowing through the discharge end of the compressor; therefore, in the embodiment of the present disclosure, the real-time temperature of the refrigerant detected by the temperature sensor is used as the discharge temperature of the compressor.
Similarly, the exhaust end of the compressor is provided with a pressure sensor which can be used for detecting the real-time pressure of the refrigerant flowing through the exhaust end of the compressor; therefore, in the embodiment of the present disclosure, the real-time pressure of the refrigerant detected by the pressure sensor is used as the discharge pressure of the compressor.
It should be understood that the defrost decay parameters of the present application include, but are not limited to, the return and discharge parameters of the compressor 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.
And S102, when the defrosting attenuation parameter meets the defrosting protection condition, reducing the refrigerant flow of the defrosting bypass branch.
Optionally, when the defrost attenuation parameter acquired in step S101 is the return air parameter of the compressor, the defrost protection condition may be set to any one of the following conditions: (1) t isReturn air＜TThreshold value of return air；（2）PReturn air＜PThreshold value of return air；（3）TReturn air＜TThreshold value of return airAnd, PReturn air＜PThreshold value of return air(ii) a Wherein, TReturn airFor return air temperature, TThreshold value of return airIs the return air temperature threshold, PReturn airFor return air pressure, PThreshold value of return airIs the return air pressure threshold.
In the above optional embodiment, the comparison between the return air parameters (return air temperature, return air pressure) and the return air thresholds corresponding thereto is mainly used as the defrosting protection condition; here, the air return threshold is generally used as a threshold value for measuring the influence of the bypass defrosting mode of the air conditioner on the performance of the compressor, and when the air return parameter is higher than the air return threshold, the influence of the bypass defrosting mode on the performance of the compressor is small, so that the current and subsequent defrosting capabilities of the air conditioner can be still kept in a better state; and when the air return parameter is lower than the air return threshold value, the bypass defrosting mode has a large influence on the performance of the compressor, so that the current and subsequent defrosting capacities of the air conditioner are greatly weakened. In this way, by comparing the magnitude of the return air parameter with the return air threshold, it can be determined whether to perform the subsequent steps to improve the defrosting capability of the air conditioner.
Alternatively, when the defrost decay parameter acquired in step S101 is the discharge parameter of the compressor, the defrost protection condition may be set to any one of the following conditions: (1) t isExhaust of gases＜TExhaust threshold；（2）PExhaust of gases＜PExhaust threshold；（3）TExhaust of gases＜TExhaust thresholdAnd, PExhaust of gases＜PExhaust threshold(ii) a Wherein, TExhaust of gasesTo exhaust temperature, TExhaust thresholdIs an exhaust gas temperature threshold, PExhaust of gasesIs the exhaust pressure, PExhaust thresholdIs an exhaust pressure threshold.
In the above optional embodiment, the comparison of the values of the exhaust parameters (exhaust temperature and exhaust pressure) and the corresponding exhaust thresholds is mainly used as the defrosting protection condition; here, the air discharge threshold value may also be a threshold value for measuring the influence of the bypass defrosting mode of the air conditioner on the performance of the compressor, and when the air discharge parameter is higher than the air discharge threshold value, the influence of the bypass defrosting mode on the performance of the compressor is small, so as to reflect that the current and subsequent defrosting capabilities of the air conditioner can still be kept in a better state; and when the exhaust parameter is lower than the exhaust threshold, the bypass defrosting mode has a large influence on the performance of the compressor, so that the current and subsequent defrosting capabilities of the air conditioner are greatly weakened. In this way, by comparing the value of the exhaust parameter with the exhaust threshold value, the function of judging whether to execute the subsequent steps to improve the defrosting capability of the air conditioner can be achieved.
Still alternatively, when the defrost attenuation parameter acquired in step S101 includes the discharge parameter and the return parameter of the compressor, the defrost protection condition may be set to any one of the following conditions: (1) t isExhaust of gases＜TExhaust thresholdAnd, TReturn air＜TThreshold value of return air；（2）PExhaust of gases＜PExhaust thresholdAnd are and，Preturn air＜PThreshold value of return air；（3）TExhaust of gases-TReturn air＜△TThreshold valueAnd/or, PExhaust of gases-PReturn air＜△PThreshold value(ii) a Wherein, Delta TThreshold valueIs the threshold value of temperature difference, Δ PThreshold valueIs the differential pressure threshold.
In the above alternative embodiment, the common influence of the bypass defrosting mode on the return and exhaust parameters of the compressor is comprehensively considered; compared with the two embodiments in the foregoing that only the return air parameter or the exhaust parameter is used as the defrosting protection condition, the embodiment of the disclosure can realize more accurate judgment on whether the defrosting capacity of the air conditioner is reduced, and is favorable for improving the control precision of the control flow of the application.
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.
In the embodiment of the present disclosure, when the defrost decay parameter in step S102 satisfies the defrost protection condition, the refrigerant flow of the defrost bypass branch is decreased. Here, the refrigerant flow rate of the defrosting bypass branch is reduced, so that the high-temperature refrigerant flow rate 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 control valve is disposed on the defrosting bypass branch in the embodiment of the disclosure, and the control valve may be used to control the on-off state of the defrosting bypass branch and adjust the flow rate of the refrigerant flowing through the defrosting bypass branch. Therefore, in step S102, when the defrost decay parameter satisfies the defrost protection condition, the flow opening of the control valve may be controlled to be decreased, so as to decrease the refrigerant flow flowing through the defrost bypass.
Optionally, the control valve is an electronic expansion valve, or other valves having on-off control and opening degree adjustment functions as well.
In some optional embodiments, the refrigerant flow rate of the defrosting bypass branch in step S102 may be decreased by a preset fixed flow rate opening degree. Here, the preset fixed flow rate opening degree is, for example, 30B, 50B, etc.
The mode of reducing 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 other alternative embodiments, the present application provides a technical solution in which the control manner is more accurate. In this embodiment, the reduction value of the refrigerant flow rate of the defrosting bypass branch is obtained according to the defrosting attenuation parameter.
Optionally, the defrost attenuation parameter for obtaining the reduced value of the refrigerant flow rate of the defrost bypass branch includes an exhaust parameter and/or a return parameter of the compressor shown in the foregoing embodiments, where the exhaust parameter includes an exhaust pressure and/or an exhaust temperature, and the return parameter includes a return pressure and/or a return temperature.
Here, the defrost attenuation parameter can reflect the influence change of the defrost bypass mode of the air conditioner operation on the performance of the compressor, and the operation of decreasing the refrigerant flow rate of the defrost bypass in step S102 is to improve the performance of the compressor. Therefore, the step of determining the reduced value of the refrigerant flow rate in the embodiment of the disclosure is a closed-loop feedback control mode, and has higher control accuracy and fast response speed.
Optionally, when the defrosting attenuation parameter is the return air temperature or the exhaust air temperature, a corresponding first reduction value may be obtained from the first defrosting attenuation association relation according to Δ T1, Δ T2, or Δ T3; wherein, Δ T1 is a first temperature difference between the exhaust temperature and the exhaust temperature threshold, Δ T2 is a second temperature difference between the return air temperature and the return air temperature threshold, and Δ T3 is a temperature difference between the exhaust temperature and the return air temperature.
Here, the first defrost decay correlation includes a correspondence of one or more Δ T1 to the first reduction value, or a correspondence of one or more Δ T2 to the first reduction value, or a correspondence of one or more Δ T3 to the first reduction value. Illustratively, an optional correspondence of Δ T1 to the first reduction value is shown in table 1, which, as shown below,
TABLE 1
Delta T1 (unit:. degree. C.) First reduction value (unit: B)
a1＜△T1≤a2 K11
a2＜△T1≤a3 K12
a3＜△T1 K13
In the corresponding relationship, the first reduction value is positively correlated with Δ T1. That is, the larger the value of Δ T1, the lower the discharge temperature of the compressor is, the larger the influence of the bypass defrosting mode on the performance of the compressor is, and therefore, the higher the first reduction value is set to reduce the amount of refrigerant branched by the bypass refrigerant branch, so that most of the refrigerant can flow through the compressor through the refrigerant circulation circuit for heating use, thereby increasing the temperature and flow rate of the refrigerant returning to the compressor as soon as possible to improve the current performance of the compressor. Although the flow rate of the refrigerant for defrosting is reduced, the performance of the compressor is improved, so that the heat carried by the discharged refrigerant for defrosting is increased, and the defrosting capacity is not influenced excessively.
Therefore, when the operation of reducing the refrigerant flow rate of the bypass defrosting branch in step S102 is performed, a first reduction value may be determined according to the first defrosting attenuation correlation, and then the refrigerant flow rate of the bypass defrosting branch may be adjusted according to the first reduction value.
Optionally, when the defrosting attenuation parameter is the return air pressure or the exhaust pressure, a corresponding second reduction value may be obtained from the second defrosting attenuation association relationship according to Δ P1, Δ P2, or Δ P3; wherein, Δ P1 is a first pressure difference value between the exhaust pressure and the exhaust pressure threshold value, Δ P2 is a second pressure difference value between the return air pressure and the return air pressure threshold value, and Δ P3 is a pressure difference value between the exhaust pressure and the return air pressure.
Here, the second defrost decay correlation includes a correspondence of one or more Δ P1 to the second reduction value, or a correspondence of one or more Δ P2 to the second reduction value, or a correspondence of one or more Δ P3 to the second reduction value. Illustratively, an optional correspondence of Δ P2 to the second reduction value is shown in table 2, which, as shown below,
TABLE 2
Delta P1 (Unit: MPa) Second reduction value (unit: B)
b1＜△P1≤b2 K21
b2＜△P1≤b3 K22
b3＜△P1 K23
In this correspondence, the second reduction value is positively correlated with Δ P1. That is, the larger the value of Δ P1, the lower the discharge pressure of the compressor is, the greater the influence of the bypass defrosting mode on the performance of the compressor is, so the higher the second reduction value is set to reduce the amount of refrigerant branched by the bypass refrigerant branch, and the purpose of improving the current performance of the compressor can be achieved as well.
Therefore, when the operation of reducing the refrigerant flow rate of the bypass defrosting branch in step S102 is performed, a second reduction value may be determined according to the second defrosting attenuation correlation, and then the refrigerant flow rate of the bypass defrosting branch may be adjusted according to the second reduction value.
In the above embodiments, the air conditioners may select one of the defrost attenuation correlations to determine the corresponding reduction value according to actual needs.
Optionally, the specifically selected rate association relationship may be determined according to a current cold and hot load of the air conditioner, for example, when the current cold and hot load of the air conditioner is low, the first defrost decay association relationship is selected, and the temperature of the refrigerant of the return exhaust gas of the compressor is mainly used as a reference factor; and when the cold and hot load of the current air conditioner is higher, the second defrosting attenuation correlation relation is selected, and at the moment, the system pressure of the air conditioner is also greatly influenced by the higher cold and hot load, so that the pressure of the refrigerant of the back exhaust of the compressor is taken as a reference factor in order to ensure the temperature operation of the air conditioner.
Here, the level of the cooling and heating load of the current air conditioner can be judged by parameters such as the indoor ambient temperature and the outdoor ambient temperature; for example, an indoor temperature threshold is preset in the air conditioner, and when the indoor ambient temperature is less than the indoor temperature threshold, the cold and hot loads of the air conditioner are higher; and when the indoor environment temperature is greater than or equal to the indoor temperature threshold value, the cold and hot load of the air conditioner is lower at the moment.
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.
Like this, in this embodiment of the disclosure not only can trigger the air conditioner to the adjustment operation of the refrigerant flow of defrosting bypass branch road according to the performance change of air condition compressor in the bypass defrosting process, can also take into account the influence of cold and hot load to air conditioning system simultaneously to improve the accuracy nature to air conditioner control, in order to ensure the operating stability of air conditioner.
In some optional embodiments, the control method for defrosting an air conditioner further comprises: and when the defrosting attenuation parameter meets the defrosting protection condition, controlling to heat the liquid outlet refrigerant of the outdoor heat exchanger.
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, a heating device is disposed at a refrigerant liquid outlet pipeline of the air conditioner outdoor heat exchanger, and the heating device is configured to controllably heat the refrigerant flowing through the refrigerant liquid outlet pipeline; therefore, when the defrosting attenuation parameter meets the defrosting protection condition, the heating device can be controlled to be started; and if the defrosting attenuation parameter does not meet the defrosting protection condition, keeping the off state of the heating device.
In some embodiments, the heating parameter for controlling the heating of the outlet refrigerant of the outdoor heat exchanger is obtained according to the defrosting attenuation parameter or the defrosting operation parameter.
Optionally, the defrost decay parameters include the discharge and/or return parameters of the compressor shown in the previous embodiments; the defrosting operation parameters comprise branch refrigerant parameters of the refrigerant flowing through the defrosting bypass branch, and the branch refrigerant parameters comprise branch refrigerant temperature, branch refrigerant pressure and/or branch refrigerant flow.
Illustratively, the step of obtaining the heating parameter based on the defrost decay parameter comprises: and acquiring corresponding heating parameters from the third defrosting attenuation correlation relation according to the defrosting attenuation parameters. Here, the third defrost decay correlation includes a correspondence of one or more defrost decay parameters to heating parameters. Therefore, the corresponding heating parameter can be obtained by matching in the third defrost decay correlation. And then the effluent liquid refrigerant of the outdoor heat exchanger can be heated according to the heating parameter control.
Similarly, the step of obtaining the heating parameter based on the defrost operating parameter comprises: and acquiring corresponding heating parameters from the associated relation of the defrosting operation according to the defrosting operation parameters. Here, the relationship of the defrosting operation includes a correspondence between one or more defrosting operation parameters and heating parameters. Therefore, the corresponding heating parameters can be obtained in a matching manner in the defrosting operation association relation so as to control the heating of the effluent liquid refrigerant of the outdoor heat exchanger.
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 some optional embodiments, the control method for defrosting an air conditioner further comprises: and when the defrosting attenuation parameter does not meet the defrosting protection condition, controlling to stop heating the liquid outlet refrigerant of the outdoor heat exchanger.
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 some optional embodiments, the control method for defrosting an air conditioner further comprises: and when the defrosting attenuation parameter meets the defrosting protection condition, controlling and increasing the refrigerant flow of the refrigerant circulation loop.
Here, after the refrigerant flow rate of the refrigerant circulation circuit is controlled to be increased, since the power of the compressor is not changed, the refrigerant flow rate of the refrigerant circulation circuit is increased, and the flow rate of the high-temperature refrigerant for defrosting branched by the defrosting bypass branch can also be reduced, so that the adverse effect of double reduction of the temperature and the flow rate of the gaseous return air refrigerant of the compressor caused by that excessive refrigerant is 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 further reduced.
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 a control device for defrosting of an air conditioner, which is structurally shown in fig. 2 and includes:
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.
In addition, the logic instructions in the memory 201 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products.
The memory 201 is a computer-readable storage medium, and can be used for storing software programs, computer-executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 200 executes functional applications and data processing by executing program instructions/modules stored in the memory 201, that is, implements the control method for defrosting an air conditioner in the above-described method embodiment.
The memory 201 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. Further, the memory 201 may include a high-speed random access memory, and may also include a nonvolatile memory.
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 present disclosure also provides an air conditioner, 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;
one end of the defrosting bypass branch 21 is communicated with an exhaust port of the compressor 14, and the other end of the defrosting bypass branch is communicated with a refrigerant inlet pipeline of the outdoor heat exchanger 11 in the heating mode; the defrosting bypass branch 21 is provided with a control valve 22;
and a control device (not shown) for defrosting the air conditioner, which is electrically connected to the control valve 22. 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 reduce the refrigerant flow of the defrosting bypass branch according to the defrosting attenuation parameter and the defrosting protection condition under the condition that the air conditioner enters the bypass defrosting mode so as to reduce the high-temperature refrigerant flow which is branched by the defrosting bypass branch and is 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 excessive refrigerant used for defrosting and further reducing the problem of the reduction of the defrosting capacity of the air conditioner caused by running the bypass defrosting mode along with the time.
Embodiments of the present disclosure also provide a computer-readable storage medium storing computer-executable instructions configured to perform the above-described method for defrosting an air conditioner.
Embodiments of the present disclosure also provide a computer program product 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 defrosting an air conditioner.
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 embodiments of the present disclosure may be embodied in the form of a software product, where the computer software product is stored in a storage medium and includes one or more instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method of the embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium comprising: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes, and may also be a transient storage medium.
The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of the disclosed embodiments includes the full ambit of the claims, as well as all available equivalents of the claims. As used in this application, although the terms "first," "second," etc. may be used in this application to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, unless the meaning of the description changes, so long as all occurrences of the "first element" are renamed consistently and all occurrences of the "second element" are renamed consistently. The first and second elements are both elements, but may not be the same element. Furthermore, the words used in the specification are words of description only and are not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising an …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other. For methods, products, etc. of the embodiment disclosures, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.
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.
In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units may be merely a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to implement the present embodiment. In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than disclosed in the description, and sometimes there is no specific order between the different operations or steps. For example, two sequential operations or steps may in fact be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Claims (8)

1. A control method for defrosting of an air conditioner is characterized by comprising the following steps:
acquiring a defrosting attenuation parameter after the air conditioner enters a bypass defrosting mode; 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;
when the defrosting attenuation parameter meets the defrosting protection condition, reducing the refrigerant flow of the defrosting bypass branch;
the reduced value of the refrigerant flow of the defrosting bypass branch is obtained according to the defrosting attenuation parameter; wherein the defrosting attenuation parameter comprises a discharge parameter and/or a return gas parameter of the compressor, the discharge parameter comprises a discharge pressure and/or a discharge temperature, and the return gas parameter comprises a return gas pressure and/or a return gas temperature;
the defrost protection conditions include: t isExhaust of gases＜TExhaust thresholdAnd/or, TReturn air＜TThreshold value of return air(ii) a Wherein, TExhaust of gasesIs the exhaust temperature, TExhaust thresholdIs an exhaust temperature threshold, TReturn airIs the return air temperature, TThreshold value of return airIs the return air temperature threshold; or, PExhaust of gases＜PExhaust thresholdAnd/or, PReturn air＜PThreshold value of return air(ii) a Wherein, PExhaust of gasesIs the discharge pressure, PExhaust thresholdIs an exhaust pressure threshold, PReturn airIs the return air pressure, PThreshold value of return airIs the return air pressure threshold; or, TExhaust of gases-TReturn air＜△TThreshold valueAnd/or, PExhaust of gases-PReturn air＜△PThreshold value(ii) a Wherein, Delta TThreshold valueIs the threshold value of temperature difference, Δ PThreshold valueIs the differential pressure threshold.
2. The control method as claimed in claim 1, wherein the obtaining of the refrigerant flow rate reduction value according to the defrost attenuation parameter comprises:
acquiring a corresponding first reduction value from the first defrosting attenuation association relation according to delta T1, delta T2 or delta T3; wherein Δ T1 is a first temperature difference between the exhaust temperature and an exhaust temperature threshold, Δ T2 is a second temperature difference between the return air temperature and a return air temperature threshold, and Δ T3 is a temperature difference between the exhaust temperature and the return air temperature; alternatively, the first and second electrodes may be,
obtaining a corresponding second reduction value from the second defrosting attenuation association relation according to delta P1, delta P2 or delta P3; wherein Δ P1 is a first pressure difference between the exhaust pressure and an exhaust pressure threshold, Δ P2 is a second pressure difference between the return pressure and a return pressure threshold, and Δ P3 is a pressure difference between the exhaust pressure and the return pressure.
3. The control method according to claim 1, characterized by further comprising:
and when the defrosting attenuation parameter meets the defrosting protection condition, controlling to heat the liquid outlet refrigerant of the outdoor heat exchanger.
4. The control method according to claim 3, 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;
the defrosting operation parameters comprise branch refrigerant parameters of the refrigerant flowing through the defrosting bypass branch, and the branch refrigerant parameters comprise branch refrigerant temperature, branch refrigerant pressure and/or branch refrigerant flow.
5. The control method according to claim 3, characterized by further comprising:
and when the defrosting attenuation parameter does not meet the defrosting protection condition, controlling to stop heating the liquid outlet refrigerant of the outdoor heat exchanger.
6. The control method according to claim 1, characterized by further comprising:
and when the defrosting attenuation parameter meets the defrosting protection condition, controlling and increasing the refrigerant flow of the refrigerant circulation loop.
7. A control apparatus for air conditioner defrosting comprising a processor and a memory having stored thereon program instructions, characterized in that the processor is configured to execute the control method for air conditioner defrosting according to any one of claims 1 to 6 when executing the program instructions.
8. An air conditioner, comprising:
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;
one end of the defrosting bypass branch is communicated with an exhaust port of the compressor, and the other end of the defrosting bypass branch is communicated with a refrigerant liquid inlet pipeline of the outdoor heat exchanger in the heating mode; the defrosting bypass branch is provided with a control valve;
a control apparatus for defrosting an air conditioner in accordance with claim 7, electrically connected to said control valve.
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