CN111189196A - Air conditioner and anti-freezing control method thereof - Google Patents

Air conditioner and anti-freezing control method thereof Download PDF

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Publication number
CN111189196A
CN111189196A CN201811352502.5A CN201811352502A CN111189196A CN 111189196 A CN111189196 A CN 111189196A CN 201811352502 A CN201811352502 A CN 201811352502A CN 111189196 A CN111189196 A CN 111189196A
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Prior art keywords
air conditioner
temperature
heat exchanger
indoor heat
inlet pipe
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CN201811352502.5A
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CN111189196B (en
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许文明
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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
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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
    • F24F11/43—Defrosting; Preventing freezing of indoor 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
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/50—Load

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

Abstract

The invention provides an air conditioner and an anti-freezing control method thereof, and belongs to the technical field of air conditioners. A liquid inlet of the indoor heat exchanger of the air conditioner is provided with a sensor for detecting the temperature of a refrigerant liquid inlet pipe; the control method comprises the following steps: when the current working mode of the air conditioner is a refrigeration mode, determining whether an indoor heat exchanger of the air conditioner has a freezing problem or not according to the temperature of a refrigerant liquid inlet pipe; in response to the freezing problem of an indoor heat exchanger of the air conditioner, controlling the air conditioner to be switched to an anti-freezing mode; and when the current working mode of the air conditioner is a heating mode, performing load protection operation on the air conditioner according to the temperature in the cold state. The air conditioner and the control method for preventing freezing thereof provided by the invention utilize the detected temperature of the refrigerant liquid inlet pipe to judge the freezing problem of the air conditioner; meanwhile, in the heating mode, the load protection operation can be carried out on the air conditioner according to the determined cold and medium temperature.

Description

Air conditioner and anti-freezing control method thereof
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner and an anti-freezing control method thereof.
Background
When the air conditioner is used for refrigerating or dehumidifying, the outer surface of the indoor heat exchanger is always in a lower temperature state due to the temperature angle of the refrigerant entering the indoor heat exchanger of the indoor unit, when indoor air flows through the indoor heat exchanger, water vapor in the air is easily condensed into dew or even frost on the indoor heat exchanger, so that the indoor heat exchanger of the indoor unit is frozen, the refrigerating effect of the air conditioner is influenced, and the refrigerating or dehumidifying capacity of the air conditioner is weaker and weaker.
For the freezing phenomenon of an indoor heat exchanger of an air conditioner, an anti-freezing implementation mode mainly adopted by the existing air conditioner is to detect the temperature of a coil by using a temperature sensor installed on the coil of the indoor heat exchanger, so that the air conditioner can judge whether the indoor heat exchanger is frozen or not according to the temperature of the coil of an indoor unit, and when the coil of the indoor unit is frozen, the air conditioner can timely treat the freezing phenomenon. However, the main function of the temperature sensor arranged on the coil of the air conditioner is not limited to freezing temperature monitoring in a cooling or dehumidifying mode, but also needs to be used for monitoring the temperature of the coil in a heating mode of the air conditioner, so as to avoid the problem of excessive heat load of the air conditioner caused by overhigh temperature of the indoor heat exchanger of the air conditioner in the heating mode, and the limitation of the two functions causes the installation position of the temperature sensor on the air conditioner to be limited to the middle coil of the indoor heat exchanger, which also causes limitation to the overall layout of the interior of the indoor unit of the air conditioner.
Disclosure of Invention
The invention provides an air conditioner and an anti-freezing method thereof, aiming at solving the defect that a temperature sensor for freezing protection of the air conditioner can only be arranged on a middle coil of an indoor heat exchanger due to the requirement of monitoring the heating load of the air conditioner. 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 and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
According to a first aspect of the invention, a control method for preventing freezing of an air conditioner is provided, wherein the air conditioner comprises an indoor heat exchanger and a compressor, and a liquid inlet of the indoor heat exchanger is provided with a sensor for detecting the temperature of a liquid inlet pipe of a refrigerant; the control method comprises the following steps:
when the current working mode of the air conditioner is a refrigeration mode, acquiring the temperature of a refrigerant liquid inlet pipe of an indoor heat exchanger of the air conditioner; determining whether the indoor heat exchanger of the air conditioner has a freezing problem according to the temperature of a refrigerant inlet pipe; in response to the freezing problem of an indoor heat exchanger of the air conditioner, controlling the air conditioner to be switched to an anti-freezing mode;
when the current working mode of the air conditioner is a heating mode, acquiring the exhaust temperature of a compressor and the temperature of a refrigerant liquid inlet pipe of an indoor heat exchanger; determining the temperature in the cold medium according to the exhaust temperature of the compressor and the temperature of a refrigerant liquid inlet pipe of the indoor heat exchanger; and carrying out load protection operation on the air conditioner according to the temperature in the cold area;
wherein the freeze prevention mode includes: sequentially executing a plurality of periodic flows defining anti-freezing operations, the periodic flows sequentially including a first periodic flow defining one or more anti-freezing operations to reduce the frequency of the compressor and increase the rotational speed of the inner fan, and a second periodic flow defining an anti-freezing operation to stop the air conditioner; re-determining whether the indoor heat exchanger of the air conditioner has a freezing problem after the execution of each cycle flow is completed; and if the newly determined indoor heat exchanger of the air conditioner has no freezing problem, exiting the anti-freezing mode.
In an alternative embodiment, the determining the middle cooling temperature according to the discharge temperature of the compressor and the temperature of the refrigerant inlet pipe of the indoor heat exchanger includes:
the cold medium temperature is calculated according to the following formula,
Tcoil＝A*Td+B*Tc+D，
wherein Tcoil is the cold and medium temperature, Td is the exhaust temperature of the compressor, Tc is the refrigerant inlet pipe temperature of the indoor heat exchanger, A is a first calculation coefficient associated with the exhaust temperature, B is a second calculation coefficient associated with the refrigerant inlet pipe temperature, and D is a calculation constant.
In an optional implementation mode, determining whether the indoor heat exchanger of the air conditioner has a freezing problem according to the temperature of a refrigerant inlet pipe comprises the following steps:
and comparing the temperature of the refrigerant liquid inlet pipe with a preset temperature threshold value, and determining whether the indoor heat exchanger of the air conditioner has a freezing problem according to a comparison result.
In an optional embodiment, comparing the temperature of the refrigerant inlet pipe with a preset temperature threshold, and determining whether the indoor heat exchanger of the air conditioner has a freezing problem according to the comparison result, includes:
if the temperature of the refrigerant liquid inlet pipe is smaller than a preset temperature threshold value, determining that the indoor heat exchanger of the air conditioner has a freezing problem;
and if the temperature of the refrigerant liquid inlet pipe is greater than or equal to a preset temperature threshold value, determining that the indoor heat exchanger of the air conditioner does not have the freezing problem.
In an alternative embodiment, the cycle durations of the plurality of cycle flows are sequentially reduced.
According to the second aspect of the invention, the air conditioner comprises an indoor heat exchanger and a compressor, wherein a liquid inlet of the indoor heat exchanger is provided with a sensor for detecting the temperature of a liquid inlet pipe of a refrigerant; the air conditioner further includes a controller for:
when the current working mode of the air conditioner is a refrigeration mode, acquiring the temperature of a refrigerant liquid inlet pipe of an indoor heat exchanger of the air conditioner; determining whether the indoor heat exchanger of the air conditioner has a freezing problem according to the temperature of a refrigerant inlet pipe; in response to the freezing problem of an indoor heat exchanger of the air conditioner, controlling the air conditioner to be switched to an anti-freezing mode;
when the current working mode of the air conditioner is a heating mode, acquiring the exhaust temperature of a compressor and the temperature of a refrigerant liquid inlet pipe of an indoor heat exchanger; determining the temperature in the cold medium according to the exhaust temperature of the compressor and the temperature of a refrigerant liquid inlet pipe of the indoor heat exchanger; and carrying out load protection operation on the air conditioner according to the temperature in the cold area;
wherein the freeze prevention mode includes: sequentially executing a plurality of periodic flows defining anti-freezing operations, the periodic flows sequentially including a first periodic flow defining one or more anti-freezing operations to reduce the frequency of the compressor and increase the rotational speed of the inner fan, and a second periodic flow defining an anti-freezing operation to stop the air conditioner; re-determining whether the indoor heat exchanger of the air conditioner has a freezing problem after the execution of each cycle flow is completed; and if the newly determined indoor heat exchanger of the air conditioner has no freezing problem, exiting the anti-freezing mode.
In an alternative embodiment, the controller is specifically configured to:
the cold medium temperature is calculated according to the following formula,
Tcoil＝A*Td+B*Tc+D，
wherein Tcoil is the cold and medium temperature, Td is the exhaust temperature of the compressor, Tc is the refrigerant inlet pipe temperature of the indoor heat exchanger, A is a first calculation coefficient associated with the exhaust temperature, B is a second calculation coefficient associated with the refrigerant inlet pipe temperature, and D is a calculation constant.
In an alternative embodiment, the controller is specifically configured to:
and comparing the temperature of the refrigerant liquid inlet pipe with a preset temperature threshold value, and determining whether the indoor heat exchanger of the air conditioner has a freezing problem according to a comparison result.
In an alternative embodiment, the controller is specifically configured to:
if the temperature of the refrigerant liquid inlet pipe is smaller than a preset temperature threshold value, determining that the indoor heat exchanger of the air conditioner has a freezing problem;
and if the temperature of the refrigerant liquid inlet pipe is greater than or equal to a preset temperature threshold value, determining that the indoor heat exchanger of the air conditioner does not have the freezing problem.
In an alternative embodiment, the cycle durations of the plurality of cycle flows are sequentially reduced.
The invention adopts the technical scheme and has the beneficial effects that:
according to the air conditioner and the anti-freezing control method thereof, the temperature sensor can be arranged on the liquid inlet of the indoor unit, and the freezing problem of the air conditioner is judged by utilizing the detected temperature of the refrigerant liquid inlet pipe; meanwhile, under the heating mode, the load protection operation can be carried out on the air conditioner according to the determined cold and medium temperature; therefore, the limit that the temperature sensor of the existing air conditioner can only be arranged at the middle position of the indoor heat exchanger can be overcome, and diversified options are provided for the overall layout of the air conditioner.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic flow chart diagram illustrating a method for controlling freeze prevention of an air conditioner according to an exemplary embodiment of the present invention;
FIG. 2 is a flowchart illustrating a control method for preventing freezing of an air conditioner according to the present invention, in accordance with still another exemplary embodiment;
FIG. 3 is a flowchart illustrating a control method for preventing freezing of an air conditioner according to the present invention, in accordance with still another exemplary embodiment;
FIG. 4 is a flowchart illustrating a control method for preventing freezing of an air conditioner according to the present invention, in accordance with still another exemplary embodiment;
fig. 5 is a flowchart illustrating a control method for preventing freezing of an air conditioner according to another exemplary embodiment of the present invention.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention 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 embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed. Herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, or apparatus. 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. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. As for the methods, products and the like disclosed by the embodiments, the description is simple because the methods correspond to the method parts disclosed by the embodiments, and the related parts can be referred to the method parts for description.
Fig. 1 is a control method for preventing freezing of an air conditioner according to the present invention, according to an exemplary embodiment.
As shown in fig. 1, the invention provides a control method for preventing freezing of an air conditioner, which can be used for solving the problem that the air outlet and heat exchange efficiency are affected due to freezing of a heat exchange tube of an indoor heat exchanger caused by a low-temperature refrigerant when the air conditioner operates in a refrigeration or dehumidification mode; the following mainly takes the anti-freezing protection in the cooling mode as an example, but it should be understood that other working modes of the air conditioner, which may cause the freezing problem of the indoor heat exchanger, may also apply the anti-freezing control method of the present invention; specifically, the method mainly comprises the following steps:
s101, judging a current operation mode of the air conditioner;
in the present embodiment, the operation mode of the air conditioner includes a cooling mode, a heating mode, and the like. In a refrigeration mode, a low-temperature refrigerant flows into the indoor heat exchanger, and the indoor heat exchanger can be frozen under the conditions of low temperature of the refrigerant, overlarge flow rate of the refrigerant and the like; in the heating mode, a high-temperature refrigerant flows into the indoor heat exchanger, and the overall heat load of the air conditioner is high under the conditions of overhigh temperature and overlarge flow of the refrigerant, so that the safe operation of the air conditioner is influenced.
In the prior art, the anti-freezing judgment and the heat load protection judgment of the air conditioner have high judgment precision by taking the temperature of the refrigerant flowing into the indoor heat exchanger as a reference parameter; because the flow direction and the port of the refrigerant flowing into the indoor heat exchanger are different in the refrigeration mode and the heating mode of the air conditioner, in order to achieve protection judgment operation in the two working modes, the temperature sensor can only be arranged at the middle position of the indoor heat exchanger in the prior art, and the coil temperature at the middle position of the indoor heat exchanger is taken as a reference value; the temperature sensor is arranged at other positions, which easily causes the judgment operation deviation of one working mode to be overlarge.
The invention is different from the arrangement mode that the temperature sensor is arranged at the middle position of the indoor heat exchanger in the prior art, and the temperature sensor is arranged at the position of the pipe orifice corresponding to the refrigerant flowing into the indoor heat exchanger when the air conditioner is in a refrigeration mode or a dehumidification mode; therefore, the temperature detection device can be used for detecting the temperature of a refrigerant liquid inlet pipe of the indoor heat exchanger, into which the refrigerant enters, in the air-conditioning operation refrigeration mode, or detecting the temperature of a refrigerant liquid outlet pipe of the indoor heat exchanger, out of which the refrigerant flows out, in the air-conditioning operation heating mode.
The control flow of the invention is that the judgment operation of anti-freezing protection is carried out on the indoor heat exchanger according to the temperature of the refrigerant liquid inlet pipe; meanwhile, for the heat load protection operation in the heating mode, the heat load protection operation can be realized according to the temperature of the refrigerant liquid outlet pipe without being limited to the temperature parameter detected by the temperature sensor arranged at the middle position of the indoor heat exchanger or the high-temperature refrigerant inflow pipe orifice.
S1021, when the current working mode of the air conditioner is a refrigeration mode, acquiring the temperature of a refrigerant liquid inlet pipe of an indoor heat exchanger of the air conditioner;
in this embodiment, the operation mode of the air conditioner may be set by a device such as a remote controller or an input panel, where the air conditioner may determine the operation mode that the air conditioner needs to be activated by analyzing and identifying a setting instruction input by a user, that is, the activated operation mode is used as the current operation mode;
when the current working mode of the air conditioner is a refrigeration mode, the air conditioner detects the temperature of the pipe at the corresponding position of the air conditioner through the temperature sensor to be used as the temperature of the refrigerant liquid inlet pipe in the step S1021;
s1022, determining whether the indoor heat exchanger of the air conditioner has a freezing problem or not according to the temperature of a refrigerant liquid inlet pipe;
optionally, in step S1022, determining whether the indoor heat exchanger of the air conditioner has a freezing problem according to the temperature of the refrigerant inlet pipe includes: and comparing the temperature of the refrigerant liquid inlet pipe with a preset temperature threshold value, and determining whether the indoor heat exchanger of the air conditioner has a freezing problem according to a comparison result.
Here, the preset temperature threshold is a preset threshold parameter of the air conditioner, which can be used as a critical temperature for determining whether the air conditioner has a freezing problem. Specifically, compare refrigerant feed liquor pipe temperature and preset temperature threshold to whether there is the freezing problem in the indoor heat exchanger of air conditioner according to the comparative result, include: if the temperature of the refrigerant liquid inlet pipe is smaller than a preset temperature threshold value, determining that the indoor heat exchanger of the air conditioner has a freezing problem; and if the temperature of the refrigerant liquid inlet pipe is greater than or equal to a preset temperature threshold value, determining that the indoor heat exchanger of the air conditioner does not have the freezing problem.
For example, the preset temperature threshold is-1 ℃, and if the temperature of the refrigerant liquid inlet pipe detected by the temperature sensor is 1 ℃, the indoor heat exchanger of the air conditioner can be determined to have no freezing problem through comparison; if the temperature of the refrigerant liquid inlet pipe detected by the temperature sensor is-3 ℃, the freezing problem of the indoor heat exchanger of the air conditioner can be determined through comparison.
Alternatively, the air conditioner may also adopt a flow for judging the freezing prevention based on the coil temperature in the prior art.
S1023, responding to the freezing problem of the indoor heat exchanger of the air conditioner, and controlling the air conditioner to be switched to an anti-freezing mode;
optionally, when the indoor heat exchanger of the air conditioner has a freezing problem, the anti-freezing mode switched by the air conditioner comprises controlling the air conditioner to be switched to a heating mode to operate; when the air conditioner is switched to the heating mode to operate, high-temperature refrigerant discharged by a compressor of the air conditioner flows into the indoor heat exchanger first, the surface temperature of the indoor heat exchanger can be raised by utilizing the heat of the refrigerant, so that frost frozen on the outer surface of the outdoor heat exchanger is melted, and the aim of preventing the air conditioner from freezing is fulfilled.
Here, the air conditioner is operated for a set period of time when switched to the heating mode. Optionally, the specific duration of the set duration is determined according to the temperature of the refrigerant liquid inlet pipe detected in step S1021, where the specific duration of the set duration and the temperature of the refrigerant liquid inlet pipe are in a negative correlation relationship, that is, the lower the temperature of the refrigerant liquid inlet pipe is, the more serious the freezing problem of the air conditioner is, the longer the specific duration of the set duration is, so as to ensure that the air conditioner has enough time to defrost and ice melt the indoor heat exchanger; and the higher the temperature of the refrigerant inlet pipe is, the lighter the freezing problem of the air conditioner is, and the shorter the specific time length of the set time length is.
Or, the air conditioner can also adopt other anti-freezing modes in the prior art to perform anti-freezing protection on the indoor heat exchanger of the air conditioner.
S1031, when the current working mode of the air conditioner is a heating mode, acquiring the exhaust temperature of the compressor and the temperature of a refrigerant liquid inlet pipe of the indoor heat exchanger;
here, the operations related to the air conditioner load protection in steps S1031 to S1033 may be applied to the flow of activating the heating mode when the air conditioner is started in cold weather in winter, and may also be applied to the load protection operation when the anti-freezing protection is performed in the heating mode in step S1023.
In this embodiment, the exhaust pipe port of the compressor of the air conditioner is further provided with another temperature sensor, and the temperature sensor can be used for detecting and obtaining the exhaust temperature of the compressor in the step S1031;
meanwhile, the temperature of the refrigerant liquid inlet pipe in the step S1031 is also detected by the temperature sensor in the foregoing, and it should be noted that the temperature of the refrigerant liquid inlet pipe detected by the temperature sensor in the step S1031 is the temperature of the pipe orifice of the high-temperature refrigerant flowing out of the indoor heat exchanger (which is the same pipe orifice as the pipe orifice of the medium-low temperature refrigerant flowing into the indoor heat exchanger in the foregoing).
S1032, determining the temperature in the cold medium according to the exhaust temperature of the compressor and the temperature of a refrigerant liquid inlet pipe of the indoor heat exchanger;
optionally, in step S1032, determining the middle temperature according to the discharge temperature of the compressor and the temperature of the refrigerant inlet pipe of the indoor heat exchanger, includes: the cold medium temperature is calculated according to the following formula,
Tcoil＝A*Td+B*Tc+D，
wherein Tcoil is the cold and medium temperature, Td is the exhaust temperature of the compressor, Tc is the refrigerant inlet pipe temperature of the indoor heat exchanger, A is a first calculation coefficient associated with the exhaust temperature, B is a second calculation coefficient associated with the refrigerant inlet pipe temperature, and D is a calculation constant.
And S1033, performing load protection operation on the air conditioner according to the cold and medium temperature.
Optionally, in step S1033, it may be determined whether the air conditioner needs to perform a load protection operation according to the cold and medium temperatures; when it is determined that the air conditioner needs to perform the load protection operation, the air conditioner performs a responsive load protection operation.
In this embodiment, determining whether the air conditioner needs to perform the load protection operation according to the cold-medium temperature may specifically include: the cold medium temperature is compared with a preset temperature threshold (which is not the same parameter as the temperature threshold in S1022), and it is determined whether the air conditioner needs to perform the load protection operation according to the comparison result. Specifically, when the temperature in the cold air is greater than or equal to a preset temperature threshold, determining that the air conditioner needs to perform load protection operation; and when the cold-medium temperature is smaller than the preset temperature threshold value, determining that the air conditioner does not need to carry out load protection operation.
Optionally, the load protection operation performed by the air conditioner may include: reducing the operating frequency of the compressor, increasing the rotating speed of an inner fan of the indoor unit, increasing the flow opening of the throttling device, and the like. Alternatively, the air conditioner may also employ other load protection operations in the prior art to protect the safe operation of the heating mode of the air conditioner.
According to the air conditioner and the anti-freezing control method thereof, the temperature sensor can be arranged on the liquid inlet of the indoor unit, and the freezing problem of the air conditioner is judged by utilizing the detected temperature of the refrigerant liquid inlet pipe; meanwhile, under the heating mode, the load protection operation can be carried out on the air conditioner according to the determined cold and medium temperature; therefore, the limit that the temperature sensor of the existing air conditioner can only be arranged at the middle position of the indoor heat exchanger can be overcome, and diversified options are provided for the overall layout of the air conditioner.
Fig. 2 is a control method for preventing freezing of an air conditioner according to the present invention, shown in accordance with still another exemplary embodiment.
As shown in fig. 2, the present invention further provides another control method for preventing freezing of an air conditioner, which can also be used to solve the problem that the air-out efficiency and the heat exchange efficiency are affected by freezing of a heat exchange tube of an indoor heat exchanger caused by a low-temperature refrigerant when the air conditioner operates in a refrigeration or dehumidification mode; specifically, the method mainly comprises the following steps:
s201, judging a current operation mode of the air conditioner;
in this embodiment, the specific execution flow of step S201 may refer to step S101 in the foregoing, which is not described herein again;
s2021, when the current working mode of the air conditioner is a refrigeration mode, acquiring the temperature of a refrigerant liquid inlet pipe of an indoor heat exchanger of the air conditioner;
in this embodiment, the specific execution flow of step S2021 may refer to step S1021 in the foregoing, which is not described herein again;
s2022, compensating and correcting the obtained temperature of the refrigerant liquid inlet pipe according to the indoor environment temperature;
in this embodiment, the air conditioner is further provided with another temperature sensor, which can be used to sense the real-time temperature of the indoor environment of the air conditioner, and the indoor environment temperature is detected by the temperature sensor in step S2022;
optionally, in step S2022, the compensation and correction of the acquired temperature of the liquid inlet pipe of the refrigerant according to the indoor environment temperature may specifically include: determining a temperature compensation amount according to the indoor environment temperature; and calculating the difference between the temperature of the refrigerant liquid inlet pipe and the temperature compensation quantity to obtain the corrected temperature of the refrigerant liquid inlet pipe.
Here, the corrected refrigerant inlet pipe temperature is set to T, the refrigerant inlet pipe temperature acquired in step S2021 is set to tcoil, and the temperature compensation amount determined from the room ambient temperature is T1, and the corrected refrigerant inlet pipe temperature T is tcoil-T1.
The indoor unit of the air conditioner is arranged in an indoor environment, and the temperature of the indoor environment can affect the temperature of a machine body of the indoor unit besides exchanging heat with the indoor environment through air flow flowing through the indoor unit, namely, the outdoor environment and the machine body of the indoor unit have a relatively slow heat exchange process, and the heat exchange energy can also affect the temperature of an indoor heat exchanger in the heat conduction process inside the machine body; particularly, in the mode of arranging the temperature sensor at the pipe orifice position of the indoor heat exchanger, because of the influence of factors such as contact area, materials and the like, the influence amplitude of the indoor environment temperature on the pipe orifice position is smaller than the influence amplitude of the whole indoor heat exchanger, particularly the middle position; therefore, in order to ensure the accuracy of judging the integral anti-freezing of the indoor heat exchanger, the invention also measures the temperature of the refrigerant liquid inlet pipe detected by the temperature sensor at the pipe orifice position and the temperature of the refrigerant pipe detected by the temperature sensor at the middle position of the heat exchanger when the air conditioner runs in a refrigeration mode under different indoor temperature conditions in a mode of tests and the like before leaving the factory, takes the difference value of the two as the temperature compensation quantity corresponding to the indoor temperature condition, constructs the incidence relation between the indoor environment temperature and the temperature compensation quantity, and stores the incidence relation into the controller of the air conditioner. Therefore, in the actual use process of the air conditioner, the air conditioner can obtain the corresponding temperature compensation amount through matching the indoor environment temperature obtained through detection and the incidence relation, and further correction operation of the temperature of the refrigerant liquid inlet pipe is achieved.
S2023, determining whether the indoor heat exchanger of the air conditioner has a freezing problem according to the corrected temperature of the refrigerant liquid inlet pipe;
s2024, responding to the freezing problem of the indoor heat exchanger of the air conditioner, and controlling the air conditioner to be switched to an anti-freezing mode;
in this embodiment, the specific execution flow of steps S2023 to S2024 may refer to steps S1022 to S1023 in the foregoing, which is not described herein again;
s2031, when the current working mode of the air conditioner is a heating mode, acquiring the exhaust temperature of a compressor and the temperature of a refrigerant inlet pipe of an indoor heat exchanger;
s2032, determining the temperature in the cold medium according to the exhaust temperature of the compressor and the temperature of a refrigerant inlet pipe of the indoor heat exchanger;
and S2033, performing load protection operation on the air conditioner according to the cold and medium temperature.
In this embodiment, the specific execution flow of step S2031 to step S2033 may refer to step S1031 to step S1033 in the foregoing, which is not described herein again.
According to the air conditioner and the anti-freezing control method thereof, the temperature sensor can be arranged on the liquid inlet of the indoor unit, and the freezing problem of the air conditioner is judged by using the corrected temperature of the refrigerant liquid inlet pipe; meanwhile, under the heating mode, the load protection operation can be carried out on the air conditioner according to the determined cold and medium temperature; therefore, the limit that the temperature sensor of the existing air conditioner can only be arranged at the middle position of the indoor heat exchanger can be overcome, and diversified options are provided for the overall layout of the air conditioner.
Fig. 3 is a control method for preventing freezing of an air conditioner according to the present invention, shown in accordance with still another exemplary embodiment.
As shown in fig. 3, the present invention further provides another control method for preventing freezing of an air conditioner, which can also be used to solve the problem that the air-out efficiency and the heat exchange efficiency are affected by freezing of a heat exchange tube of an indoor heat exchanger caused by a low-temperature refrigerant when the air conditioner operates in a refrigeration or dehumidification mode; specifically, the method mainly comprises the following steps:
s301, judging the current operation mode of the air conditioner;
in this embodiment, the specific execution flow of step S301 may refer to step S101 in the foregoing, which is not described herein again;
s3021, when the current working mode of the air conditioner is a refrigeration mode, acquiring the temperature of a refrigerant liquid inlet pipe of an indoor heat exchanger of the air conditioner;
s3022, determining whether the indoor heat exchanger of the air conditioner has a freezing problem or not according to the temperature of a refrigerant liquid inlet pipe;
in this embodiment, the specific execution flow of steps S3021 to S3022 may refer to steps S1021 to S1022 in the foregoing, which is not described herein again;
s3023, controlling the air conditioner to be switched to an anti-freezing mode in response to the freezing problem of the indoor heat exchanger of the air conditioner;
optionally, when there is a freezing problem in the indoor heat exchanger of the air conditioner, the freeze prevention mode switched by the air conditioner includes: sequentially executing a plurality of periodic flows for limiting anti-freezing operation, wherein the periodic flows sequentially comprise one or more first periodic flows for limiting the anti-freezing operation to reduce the frequency of the compressor and increase the rotating speed of the inner fan, a second periodic flow for limiting the anti-freezing operation to a set time length for operating the electric auxiliary heating device of the indoor unit and a third periodic flow for limiting the anti-freezing operation to stop the air conditioner;
here, each cycle flow has a set cycle duration; optionally, the cycle durations of the plurality of cycle flows are sequentially reduced.
Illustratively, in response to the freezing problem of the indoor heat exchanger of the air conditioner, the air conditioner performs an anti-freezing operation defined by a first periodic flow, that is, in the first periodic flow, the frequency of the compressor is reduced to a set frequency value, the rotating speed of the inner fan is increased to a preset rotating speed value, and the time for maintaining the set frequency value and the preset rotating speed value of the compressor is 30 min; the first periodic flow may be performed only 1 time, or, alternatively, continuously performed a plurality of times; then, the air conditioner executes the anti-freezing operation defined by the second period process, namely in the second period process, starting the electric auxiliary heating device of the indoor unit, and enabling the running time of the electric auxiliary heating device to be the set time for 5min, wherein the set time is the second period time; and then, the air conditioner executes the anti-freezing operation defined by the third periodic flow, namely in the third periodic flow, the air conditioner is controlled to stop for 2min, and the stop time is the third periodic time of the third periodic flow.
Here, it is redetermined whether there is a freezing problem in the indoor heat exchanger of the air conditioner after the execution of the flow is completed every cycle; step S3021 to step S3022 are executed again after the process is executed in each cycle, and if the indoor heat exchanger of the air conditioner is determined to be not frozen again, the air conditioner exits from the anti-freezing mode, and at this time, the air conditioner is switched back to the original working mode, such as the cooling mode; and if the newly determined indoor heat exchanger of the air conditioner still has the freezing problem, continuously executing the anti-freezing mode according to the original sequence.
S3031, when the current working mode of the air conditioner is a heating mode, acquiring the exhaust temperature of a compressor and the temperature of a refrigerant liquid inlet pipe of an indoor heat exchanger;
s3032, determining the temperature in cold and medium according to the exhaust temperature of the compressor and the temperature of a refrigerant liquid inlet pipe of the indoor heat exchanger;
and S3033, performing load protection operation on the air conditioner according to the cold and medium temperature.
In this embodiment, the specific execution flow of steps S3031 to S3033 may refer to steps S1031 to S1033 in the foregoing, which is not described herein again.
According to the air conditioner and the anti-freezing control method thereof, the temperature sensor can be arranged on the liquid inlet of the indoor unit, and the freezing problem of the air conditioner is judged by utilizing the temperature of the refrigerant liquid inlet pipe; meanwhile, under the heating mode, the load protection operation can be carried out on the air conditioner according to the determined cold and medium temperature; therefore, the limit that the temperature sensor of the existing air conditioner can only be arranged at the middle position of the indoor heat exchanger can be overcome, and diversified options are provided for the overall layout of the air conditioner.
Fig. 4 is a control method for preventing freezing of an air conditioner according to the present invention, which is shown in accordance with still another exemplary embodiment.
As shown in fig. 4, the present invention further provides another control method for preventing freezing of an air conditioner, which can also be used to solve the problem that the air-out efficiency and the heat exchange efficiency are affected by freezing of a heat exchange tube of an indoor heat exchanger caused by a low-temperature refrigerant when the air conditioner operates in a refrigeration or dehumidification mode; specifically, the method mainly comprises the following steps:
s401, judging a current operation mode of the air conditioner;
in this embodiment, the specific execution flow of step S401 may refer to step S101 in the foregoing, which is not described herein again;
s4021, when the current working mode of the air conditioner is a refrigeration mode, acquiring the temperature of a refrigerant liquid inlet pipe of an indoor heat exchanger of the air conditioner;
s4022, determining whether the indoor heat exchanger of the air conditioner has a freezing problem or not according to the temperature of a refrigerant liquid inlet pipe;
in this embodiment, the specific execution flow of steps S4021 to S4022 may refer to steps S1021 to S1022 in the foregoing, which is not described herein again;
s4023, controlling the air conditioner to switch to an anti-freezing mode in response to the freezing problem of the indoor heat exchanger of the air conditioner;
optionally, when there is a freezing problem in the indoor heat exchanger of the air conditioner, the freeze prevention mode switched by the air conditioner includes: sequentially executing a plurality of periodic flows defining anti-freezing operations, the periodic flows sequentially including a first periodic flow defining one or more anti-freezing operations to reduce the frequency of the compressor and increase the rotational speed of the inner fan, and a second periodic flow defining an anti-freezing operation to stop the air conditioner;
here, each cycle flow has a set cycle duration; optionally, the cycle durations of the plurality of cycle flows are sequentially reduced.
Illustratively, in response to the freezing problem of the indoor heat exchanger of the air conditioner, the air conditioner performs an anti-freezing operation defined by a first periodic flow, that is, in the first periodic flow, the frequency of the compressor is reduced to a set frequency value, the rotating speed of the inner fan is increased to a preset rotating speed value, and the time for maintaining the set frequency value and the preset rotating speed value of the compressor is 30 min; the first periodic flow may be performed only 1 time, or, alternatively, continuously performed a plurality of times; and then, the air conditioner executes the anti-freezing operation defined by the second period process, namely, in the second period process, the air conditioner is controlled to stop, the stop time is 5min, and the stop time is the second period time of the second period process.
Here, it is redetermined whether there is a freezing problem in the indoor heat exchanger of the air conditioner after the execution of the flow is completed every cycle; step S4021 to step S4022 are executed again after the process is executed in each period, if the indoor heat exchanger of the air conditioner is not frozen, the air conditioner exits the anti-freezing mode, and at the moment, the air conditioner is switched back to the original working mode, such as the refrigeration mode; and if the newly determined indoor heat exchanger of the air conditioner still has the freezing problem, continuously executing the anti-freezing mode according to the original sequence.
S4031, when the current working mode of the air conditioner is a heating mode, acquiring the exhaust temperature of a compressor and the temperature of a refrigerant liquid inlet pipe of an indoor heat exchanger;
s4032, determining the temperature in the cold medium according to the exhaust temperature of the compressor and the temperature of a refrigerant liquid inlet pipe of the indoor heat exchanger;
and S4033, performing load protection operation on the air conditioner according to the cold and medium temperature.
In this embodiment, the specific execution flow of steps S4031 to S4033 may refer to steps S1031 to S1033 in the foregoing, which is not described herein again.
According to the air conditioner and the anti-freezing control method thereof, the temperature sensor can be arranged on the liquid inlet of the indoor unit, and the freezing problem of the air conditioner is judged by utilizing the temperature of the refrigerant liquid inlet pipe; meanwhile, under the heating mode, the load protection operation can be carried out on the air conditioner according to the determined cold and medium temperature; therefore, the limit that the temperature sensor of the existing air conditioner can only be arranged at the middle position of the indoor heat exchanger can be overcome, and diversified options are provided for the overall layout of the air conditioner.
Fig. 5 is a control method for preventing freezing of an air conditioner according to the present invention, shown in accordance with still another exemplary embodiment.
As shown in fig. 5, the present invention further provides another control method for preventing freezing of an air conditioner, which can also be used to solve the problem that the air-out efficiency and the heat exchange efficiency are affected by freezing of a heat exchange tube of an indoor heat exchanger caused by a low-temperature refrigerant when the air conditioner operates in a refrigeration or dehumidification mode; specifically, the method mainly comprises the following steps:
s501, judging the current operation mode of the air conditioner;
in this embodiment, the specific execution flow of step S501 may refer to step S101 in the foregoing, which is not described herein again;
s5021, when the current working mode of the air conditioner is a refrigeration mode, obtaining the temperature of a refrigerant liquid inlet pipe of an indoor heat exchanger of the air conditioner;
s5022, determining whether the indoor heat exchanger of the air conditioner has a freezing problem or not according to the temperature of a refrigerant liquid inlet pipe;
in this embodiment, the specific execution flow of steps S5021 to S5022 may refer to steps S1021 to S1022 in the foregoing, which are not described herein again;
s5023, responding to the freezing problem of the indoor heat exchanger of the air conditioner, and controlling the air conditioner to be switched to an anti-freezing mode;
optionally, when there is a freezing problem in the indoor heat exchanger of the air conditioner, the freeze prevention mode switched by the air conditioner includes: sequentially executing a plurality of periodic flows defining anti-freezing operations, the periodic flows sequentially including one or more first periodic flows defining anti-freezing operations to reduce the frequency of the compressor, increase the rotation speed of the inner fan and increase the opening degree of the throttling device, and second periodic flows defining anti-freezing operations to stop the air conditioner;
here, each cycle flow has a set cycle duration; optionally, the cycle durations of the plurality of cycle flows are sequentially reduced.
Illustratively, in response to the freezing problem of the indoor heat exchanger of the air conditioner, the air conditioner performs an anti-freezing operation defined by a first periodic flow, that is, in the first periodic flow, the frequency of the compressor is decreased to a set frequency value, the rotating speed of the inner fan is increased to a preset rotating speed value, and the opening degree of the throttling device is increased to a preset opening value, and the time for maintaining the set frequency value, the preset rotating speed value of the inner fan and the preset opening value of the throttling device for the compressor is 30 min; the first periodic flow may be performed only 1 time, or, alternatively, continuously performed a plurality of times; and then, the air conditioner executes the anti-freezing operation defined by the second period process, namely, in the second period process, the air conditioner is controlled to stop, the stop time is 5min, and the stop time is the second period time of the second period process.
Here, it is redetermined whether there is a freezing problem in the indoor heat exchanger of the air conditioner after the execution of the flow is completed every cycle; step S5021 to step S5022 are executed again after the flow of each cycle is executed, if the indoor heat exchanger of the air conditioner is determined to be not frozen again, the air conditioner exits from the anti-freezing mode, and at this time, the air conditioner is switched back to the original working mode, such as the refrigeration mode; and if the newly determined indoor heat exchanger of the air conditioner still has the freezing problem, continuously executing the anti-freezing mode according to the original sequence.
S5031, when the current working mode of the air conditioner is a heating mode, acquiring the exhaust temperature of a compressor and the temperature of a refrigerant liquid inlet pipe of an indoor heat exchanger;
s5032, determining the temperature in the cold air according to the exhaust temperature of the compressor and the temperature of a refrigerant liquid inlet pipe of the indoor heat exchanger;
and S5033, performing load protection operation on the air conditioner according to the cold and medium temperature.
In this embodiment, the specific execution flow of steps S5031 to S5033 may refer to steps S1031 to S1033 in the foregoing, which is not described herein again.
According to the air conditioner and the anti-freezing control method thereof, the temperature sensor can be arranged on the liquid inlet of the indoor unit, and the freezing problem of the air conditioner is judged by utilizing the temperature of the refrigerant liquid inlet pipe; meanwhile, under the heating mode, the load protection operation can be carried out on the air conditioner according to the determined cold and medium temperature; therefore, the limit that the temperature sensor of the existing air conditioner can only be arranged at the middle position of the indoor heat exchanger can be overcome, and diversified options are provided for the overall layout of the air conditioner.
In an alternative embodiment, the present invention further provides an air conditioner capable of performing the control flow disclosed in the embodiment of fig. 1 above.
The air conditioner comprises an indoor heat exchanger and a compressor, wherein a liquid inlet of the indoor heat exchanger is provided with a sensor for detecting the temperature of a refrigerant liquid inlet pipe; the air conditioner further includes a controller for:
when the current working mode of the air conditioner is a refrigeration mode, acquiring the temperature of a refrigerant liquid inlet pipe of an indoor heat exchanger of the air conditioner; determining whether the indoor heat exchanger of the air conditioner has a freezing problem according to the temperature of a refrigerant inlet pipe; in response to the freezing problem of an indoor heat exchanger of the air conditioner, controlling the air conditioner to be switched to an anti-freezing mode;
when the current working mode of the air conditioner is a heating mode, acquiring the exhaust temperature of a compressor and the temperature of a refrigerant liquid inlet pipe of an indoor heat exchanger; determining the temperature in the cold medium according to the exhaust temperature of the compressor and the temperature of a refrigerant liquid inlet pipe of the indoor heat exchanger; and performing load protection operation on the air conditioner according to the temperature in the cold area.
Optionally, the controller is specifically configured to:
the cold medium temperature is calculated according to the following formula,
Tcoil＝A*Td+B*Tc+D，
wherein Tcoil is the cold and medium temperature, Td is the exhaust temperature of the compressor, Tc is the refrigerant inlet pipe temperature of the indoor heat exchanger, A is a first calculation coefficient associated with the exhaust temperature, B is a second calculation coefficient associated with the refrigerant inlet pipe temperature, and D is a calculation constant.
Optionally, the controller is specifically configured to:
and comparing the temperature of the refrigerant liquid inlet pipe with a preset temperature threshold value, and determining whether the indoor heat exchanger of the air conditioner has a freezing problem according to a comparison result.
Optionally, the controller is specifically configured to:
if the temperature of the refrigerant liquid inlet pipe is smaller than a preset temperature threshold value, determining that the indoor heat exchanger of the air conditioner has a freezing problem;
and if the temperature of the refrigerant liquid inlet pipe is greater than or equal to a preset temperature threshold value, determining that the indoor heat exchanger of the air conditioner does not have the freezing problem.
Optionally, the controller is specifically configured to:
and controlling the air conditioner to be switched to a heating mode for operation.
The specific manner of executing the above process by the air conditioner control may refer to the foregoing embodiments, which are not described herein again.
In an alternative embodiment, the present invention further provides an air conditioner capable of performing the control flow disclosed in the embodiment of fig. 2 above.
The air conditioner comprises an indoor heat exchanger and a compressor, wherein a liquid inlet of the indoor heat exchanger is provided with a sensor for detecting the temperature of a refrigerant liquid inlet pipe; the air conditioner further includes a controller for:
when the current working mode of the air conditioner is a refrigeration mode, acquiring the temperature of a refrigerant liquid inlet pipe of an indoor heat exchanger of the air conditioner; compensating and correcting the acquired temperature of the refrigerant liquid inlet pipe according to the indoor environment temperature; determining whether the indoor heat exchanger of the air conditioner has a freezing problem according to the corrected temperature of the refrigerant liquid inlet pipe; in response to the freezing problem of an indoor heat exchanger of the air conditioner, controlling the air conditioner to be switched to an anti-freezing mode;
when the current working mode of the air conditioner is a heating mode, acquiring the exhaust temperature of a compressor and the temperature of a refrigerant liquid inlet pipe of an indoor heat exchanger; determining the temperature in the cold medium according to the exhaust temperature of the compressor and the temperature of a refrigerant liquid inlet pipe of the indoor heat exchanger; and performing load protection operation on the air conditioner according to the temperature in the cold area.
Optionally, the controller is specifically configured to:
the cold medium temperature is calculated according to the following formula,
Tcoil＝A*Td+B*Tc+D，
wherein Tcoil is the cold and medium temperature, Td is the exhaust temperature of the compressor, Tc is the refrigerant inlet pipe temperature of the indoor heat exchanger, A is a first calculation coefficient associated with the exhaust temperature, B is a second calculation coefficient associated with the refrigerant inlet pipe temperature, and D is a calculation constant.
Optionally, the controller is specifically configured to:
and comparing the temperature of the refrigerant liquid inlet pipe with a preset temperature threshold value, and determining whether the indoor heat exchanger of the air conditioner has a freezing problem according to a comparison result.
Optionally, the controller is specifically configured to:
if the temperature of the refrigerant liquid inlet pipe is smaller than a preset temperature threshold value, determining that the indoor heat exchanger of the air conditioner has a freezing problem;
and if the temperature of the refrigerant liquid inlet pipe is greater than or equal to a preset temperature threshold value, determining that the indoor heat exchanger of the air conditioner does not have the freezing problem.
Optionally, the controller is specifically configured to:
determining a temperature compensation amount according to the indoor environment temperature;
and calculating the difference between the temperature of the refrigerant liquid inlet pipe and the temperature compensation quantity to obtain the corrected temperature of the refrigerant liquid inlet pipe.
The specific manner of executing the above process by the air conditioner control may refer to the foregoing embodiments, which are not described herein again.
In an alternative embodiment, the present invention further provides an air conditioner capable of performing the control flow disclosed in the embodiment of fig. 3 above.
The air conditioner comprises an indoor heat exchanger and a compressor, wherein a liquid inlet of the indoor heat exchanger is provided with a sensor for detecting the temperature of a refrigerant liquid inlet pipe; the air conditioner further includes a controller for:
when the current working mode of the air conditioner is a refrigeration mode, acquiring the temperature of a refrigerant liquid inlet pipe of an indoor heat exchanger of the air conditioner; determining whether the indoor heat exchanger of the air conditioner has a freezing problem according to the temperature of a refrigerant inlet pipe; in response to the freezing problem of an indoor heat exchanger of the air conditioner, controlling the air conditioner to be switched to an anti-freezing mode;
when the current working mode of the air conditioner is a heating mode, acquiring the exhaust temperature of a compressor and the temperature of a refrigerant liquid inlet pipe of an indoor heat exchanger; determining the temperature in the cold medium according to the exhaust temperature of the compressor and the temperature of a refrigerant liquid inlet pipe of the indoor heat exchanger; and carrying out load protection operation on the air conditioner according to the temperature in the cold area;
wherein the freeze prevention mode includes: sequentially executing a plurality of periodic flows for limiting anti-freezing operation, wherein the periodic flows sequentially comprise one or more first periodic flows for limiting the anti-freezing operation to reduce the frequency of the compressor and increase the rotating speed of the inner fan, a second periodic flow for limiting the anti-freezing operation to a set time length for operating the electric auxiliary heating device of the indoor unit and a third periodic flow for limiting the anti-freezing operation to stop the air conditioner; re-determining whether the indoor heat exchanger of the air conditioner has a freezing problem after the execution of each cycle flow is completed; if the newly determined indoor heat exchanger of the air conditioner does not have the freezing problem, the mode of anti-freezing is exited; and
the load protection mode includes: determining the temperature in the cold medium according to the exhaust temperature of the compressor and the temperature of a refrigerant liquid inlet pipe of the indoor heat exchanger; and performing load protection operation on the air conditioner according to the temperature in the cold area.
Optionally, the controller is specifically configured to:
the cold medium temperature is calculated according to the following formula,
Tcoil＝A*Td+B*Tc+D，
wherein Tcoil is the cold and medium temperature, Td is the exhaust temperature of the compressor, Tc is the refrigerant inlet pipe temperature of the indoor heat exchanger, A is a first calculation coefficient associated with the exhaust temperature, B is a second calculation coefficient associated with the refrigerant inlet pipe temperature, and D is a calculation constant.
Optionally, the controller is specifically configured to:
and comparing the temperature of the refrigerant liquid inlet pipe with a preset temperature threshold value, and determining whether the indoor heat exchanger of the air conditioner has a freezing problem according to a comparison result.
Optionally, the controller is specifically configured to:
if the temperature of the refrigerant liquid inlet pipe is smaller than a preset temperature threshold value, determining that the indoor heat exchanger of the air conditioner has a freezing problem;
and if the temperature of the refrigerant liquid inlet pipe is greater than or equal to a preset temperature threshold value, determining that the indoor heat exchanger of the air conditioner does not have the freezing problem.
Optionally, the cycle durations of the plurality of cycle flows are sequentially reduced.
The specific manner of executing the above process by the air conditioner control may refer to the foregoing embodiments, which are not described herein again.
In an alternative embodiment, the present invention further provides an air conditioner capable of executing the control flow disclosed in the embodiment of fig. 4 above.
The air conditioner comprises an indoor heat exchanger and a compressor, wherein a liquid inlet of the indoor heat exchanger is provided with a sensor for detecting the temperature of a refrigerant liquid inlet pipe; the air conditioner further includes a controller for:
when the current working mode of the air conditioner is a refrigeration mode, acquiring the temperature of a refrigerant liquid inlet pipe of an indoor heat exchanger of the air conditioner; determining whether the indoor heat exchanger of the air conditioner has a freezing problem according to the temperature of a refrigerant inlet pipe; in response to the freezing problem of an indoor heat exchanger of the air conditioner, controlling the air conditioner to be switched to an anti-freezing mode;
when the current working mode of the air conditioner is a heating mode, acquiring the exhaust temperature of a compressor and the temperature of a refrigerant liquid inlet pipe of an indoor heat exchanger; determining the temperature in the cold medium according to the exhaust temperature of the compressor and the temperature of a refrigerant liquid inlet pipe of the indoor heat exchanger; and carrying out load protection operation on the air conditioner according to the temperature in the cold area;
wherein the freeze prevention mode includes: sequentially executing a plurality of periodic flows defining anti-freezing operations, the periodic flows sequentially including a first periodic flow defining one or more anti-freezing operations to reduce the frequency of the compressor and increase the rotational speed of the inner fan, and a second periodic flow defining an anti-freezing operation to stop the air conditioner; re-determining whether the indoor heat exchanger of the air conditioner has a freezing problem after the execution of each cycle flow is completed; and if the newly determined indoor heat exchanger of the air conditioner has no freezing problem, exiting the anti-freezing mode.
Optionally, the controller is specifically configured to:
the cold medium temperature is calculated according to the following formula,
Tcoil＝A*Td+B*Tc+D，
wherein Tcoil is the cold and medium temperature, Td is the exhaust temperature of the compressor, Tc is the refrigerant inlet pipe temperature of the indoor heat exchanger, A is a first calculation coefficient associated with the exhaust temperature, B is a second calculation coefficient associated with the refrigerant inlet pipe temperature, and D is a calculation constant.
Optionally, the controller is specifically configured to:
and comparing the temperature of the refrigerant liquid inlet pipe with a preset temperature threshold value, and determining whether the indoor heat exchanger of the air conditioner has a freezing problem according to a comparison result.
Optionally, the controller is specifically configured to:
if the temperature of the refrigerant liquid inlet pipe is smaller than a preset temperature threshold value, determining that the indoor heat exchanger of the air conditioner has a freezing problem;
and if the temperature of the refrigerant liquid inlet pipe is greater than or equal to a preset temperature threshold value, determining that the indoor heat exchanger of the air conditioner does not have the freezing problem.
Optionally, the cycle durations of the plurality of cycle flows are sequentially reduced.
The specific manner of executing the above process by the air conditioner control may refer to the foregoing embodiments, which are not described herein again.
In an alternative embodiment, the present invention further provides an air conditioner capable of executing the control flow disclosed in the embodiment of fig. 5 above.
The air conditioner comprises an indoor heat exchanger and a compressor, wherein a liquid inlet of the indoor heat exchanger is provided with a sensor for detecting the temperature of a refrigerant liquid inlet pipe; the air conditioner further includes a controller for:
when the current working mode of the air conditioner is a refrigeration mode, acquiring the temperature of a refrigerant liquid inlet pipe of an indoor heat exchanger of the air conditioner; determining whether the indoor heat exchanger of the air conditioner has a freezing problem according to the temperature of a refrigerant inlet pipe; in response to the freezing problem of an indoor heat exchanger of the air conditioner, controlling the air conditioner to be switched to an anti-freezing mode;
when the current working mode of the air conditioner is a heating mode, acquiring the exhaust temperature of a compressor and the temperature of a refrigerant liquid inlet pipe of an indoor heat exchanger; determining the temperature in the cold medium according to the exhaust temperature of the compressor and the temperature of a refrigerant liquid inlet pipe of the indoor heat exchanger; and carrying out load protection operation on the air conditioner according to the temperature in the cold area;
wherein the freeze prevention mode includes: sequentially executing a plurality of periodic flows defining anti-freezing operations, the periodic flows sequentially including one or more first periodic flows defining anti-freezing operations to reduce the frequency of the compressor, increase the rotation speed of the inner fan and increase the opening degree of the throttling device, and second periodic flows defining anti-freezing operations to stop the air conditioner; re-determining whether the indoor heat exchanger of the air conditioner has a freezing problem after the execution of each cycle flow is completed; and if the newly determined indoor heat exchanger of the air conditioner has no freezing problem, exiting the anti-freezing mode.
Optionally, the controller is specifically configured to:
the cold medium temperature is calculated according to the following formula,
Tcoil＝A*Td+B*Tc+D，
wherein Tcoil is the cold and medium temperature, Td is the exhaust temperature of the compressor, Tc is the refrigerant inlet pipe temperature of the indoor heat exchanger, A is a first calculation coefficient associated with the exhaust temperature, B is a second calculation coefficient associated with the refrigerant inlet pipe temperature, and D is a calculation constant.
Optionally, the controller is specifically configured to:
and comparing the temperature of the refrigerant liquid inlet pipe with a preset temperature threshold value, and determining whether the indoor heat exchanger of the air conditioner has a freezing problem according to a comparison result.
Optionally, the controller is specifically configured to:
if the temperature of the refrigerant liquid inlet pipe is smaller than a preset temperature threshold value, determining that the indoor heat exchanger of the air conditioner has a freezing problem;
and if the temperature of the refrigerant liquid inlet pipe is greater than or equal to a preset temperature threshold value, determining that the indoor heat exchanger of the air conditioner does not have the freezing problem.
Optionally, the cycle durations of the plurality of cycle flows are sequentially reduced.
The specific manner of executing the above process by the air conditioner control may refer to the foregoing embodiments, which are not described herein again.
It is to be understood that the present invention is not limited to the procedures and structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims (10)

1. The control method for preventing the air conditioner from freezing is characterized in that the air conditioner comprises an indoor heat exchanger and a compressor, wherein a liquid inlet of the indoor heat exchanger is provided with a sensor for detecting the temperature of a liquid inlet pipe of a refrigerant; the control method comprises the following steps:
when the current working mode of the air conditioner is a refrigeration mode, acquiring the temperature of the refrigerant liquid inlet pipe of the indoor heat exchanger of the air conditioner; determining whether the indoor heat exchanger of the air conditioner has a freezing problem or not according to the temperature of the refrigerant liquid inlet pipe; in response to the indoor heat exchanger of the air conditioner having a freezing problem, controlling the air conditioner to switch to an anti-freezing mode;
when the current working mode of the air conditioner is a heating mode, acquiring the exhaust temperature of the compressor and the temperature of the refrigerant liquid inlet pipe of the indoor heat exchanger; determining the temperature in the cold medium according to the exhaust temperature of the compressor and the temperature of the refrigerant liquid inlet pipe of the indoor heat exchanger; carrying out load protection operation on the air conditioner according to the cold medium temperature;
wherein the freeze prevention mode includes: sequentially executing a plurality of periodic flows defining anti-freezing operations, the periodic flows sequentially including a first periodic flow defining one or more of the anti-freezing operations as a decrease in the frequency of a compressor and an increase in the rotational speed of an internal fan, and a second periodic flow defining the anti-freezing operations as a shutdown of the air conditioner; re-determining whether there is a freezing problem in the indoor heat exchanger of the air conditioner after the execution of each cycle flow is completed; and if the indoor heat exchanger of the air conditioner is not frozen, the anti-freezing mode is exited.
2. The control method according to claim 1, wherein the determining the middle temperature according to the discharge temperature of the compressor and the refrigerant inlet pipe temperature of the indoor heat exchanger comprises:
the cold medium temperature is calculated according to the following formula,
Tcoil＝A*Td+B*Tc+D，
wherein Tcoil is the cold medium temperature, Td is the discharge temperature of the compressor, Tc is the refrigerant inlet pipe temperature of the indoor heat exchanger, a is a first calculation coefficient associated with the discharge temperature, B is a second calculation coefficient associated with the refrigerant inlet pipe temperature, and D is a calculation constant.
3. The control method according to claim 1, wherein the determining whether the indoor heat exchanger of the air conditioner has a freezing problem according to the temperature of the refrigerant inlet pipe comprises:
and comparing the temperature of the refrigerant liquid inlet pipe with a preset temperature threshold value, and determining whether the indoor heat exchanger of the air conditioner has a freezing problem according to a comparison result.
4. The control method according to claim 3, wherein the step of comparing the temperature of the refrigerant inlet pipe with a preset temperature threshold value and determining whether the indoor heat exchanger of the air conditioner has a freezing problem according to the comparison result comprises the steps of:
if the temperature of the refrigerant liquid inlet pipe is smaller than the preset temperature threshold value, determining that the indoor heat exchanger of the air conditioner has a freezing problem;
and if the temperature of the refrigerant liquid inlet pipe is greater than or equal to the preset temperature threshold value, determining that the indoor heat exchanger of the air conditioner does not have the freezing problem.
5. The control method according to claim 1, characterized in that the cycle durations of the plurality of cycle flows are sequentially decreased.
6. The air conditioner is characterized by comprising an indoor heat exchanger and a compressor, wherein a liquid inlet of the indoor heat exchanger is provided with a sensor for detecting the temperature of a liquid inlet pipe of a refrigerant; the air conditioner further includes a controller for:
when the current working mode of the air conditioner is a refrigeration mode, acquiring the temperature of the refrigerant liquid inlet pipe of the indoor heat exchanger of the air conditioner; determining whether the indoor heat exchanger of the air conditioner has a freezing problem or not according to the temperature of the refrigerant liquid inlet pipe; in response to the indoor heat exchanger of the air conditioner having a freezing problem, controlling the air conditioner to switch to an anti-freezing mode;
when the current working mode of the air conditioner is a heating mode, acquiring the exhaust temperature of the compressor and the temperature of the refrigerant liquid inlet pipe of the indoor heat exchanger; determining the temperature in the cold medium according to the exhaust temperature of the compressor and the temperature of the refrigerant liquid inlet pipe of the indoor heat exchanger; carrying out load protection operation on the air conditioner according to the cold medium temperature;
wherein the freeze prevention mode includes: sequentially executing a plurality of periodic flows defining anti-freezing operations, the periodic flows sequentially including a first periodic flow defining one or more of the anti-freezing operations as a decrease in the frequency of a compressor and an increase in the rotational speed of an internal fan, and a second periodic flow defining the anti-freezing operations as a shutdown of the air conditioner; re-determining whether there is a freezing problem in the indoor heat exchanger of the air conditioner after the execution of each cycle flow is completed; and if the indoor heat exchanger of the air conditioner is not frozen, the anti-freezing mode is exited.
7. The air conditioner of claim 6, wherein the controller is specifically configured to:
the cold medium temperature is calculated according to the following formula,
Tcoil＝A*Td+B*Tc+D，
wherein Tcoil is the cold medium temperature, Td is the discharge temperature of the compressor, Tc is the refrigerant inlet pipe temperature of the indoor heat exchanger, a is a first calculation coefficient associated with the discharge temperature, B is a second calculation coefficient associated with the refrigerant inlet pipe temperature, and D is a calculation constant.
8. The air conditioner of claim 6, wherein the controller is specifically configured to:
and comparing the temperature of the refrigerant liquid inlet pipe with a preset temperature threshold value, and determining whether the indoor heat exchanger of the air conditioner has a freezing problem according to a comparison result.
9. The air conditioner of claim 8, wherein the controller is specifically configured to:
if the temperature of the refrigerant liquid inlet pipe is smaller than the preset temperature threshold value, determining that the indoor heat exchanger of the air conditioner has a freezing problem;
and if the temperature of the refrigerant liquid inlet pipe is greater than or equal to the preset temperature threshold value, determining that the indoor heat exchanger of the air conditioner does not have the freezing problem.
10. The air conditioner according to claim 6, wherein the cycle durations of the plurality of cycle flows are sequentially decreased.
CN201811352502.5A 2018-11-14 2018-11-14 Air conditioner and anti-freezing control method thereof Active CN111189196B (en)

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