CN111189173A - 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
CN111189173A
CN111189173A CN201811352099.6A CN201811352099A CN111189173A CN 111189173 A CN111189173 A CN 111189173A CN 201811352099 A CN201811352099 A CN 201811352099A CN 111189173 A CN111189173 A CN 111189173A
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China
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temperature
air conditioner
inlet pipe
liquid inlet
freezing
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CN201811352099.6A
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CN111189173B (en
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许文明
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Qingdao Haier Air Conditioner Gen Corp Ltd
Haier Smart Home Co Ltd
Chongqing Haier Air Conditioner 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

Abstract

The invention discloses an air conditioner and an anti-freezing control method thereof, and belongs to the technical field of air conditioners. The control method comprises the following steps: acquiring a refrigerant liquid inlet pipe temperature and a middle pipe temperature of an air conditioner; comparing the numerical values of the refrigerant liquid inlet pipe temperature and the middle pipe temperature and calculating the temperature difference value of the refrigerant liquid inlet pipe temperature and the middle pipe temperature; responding to the temperature of a refrigerant liquid inlet pipe to be less than the temperature of a middle pipe, and taking the temperature of the refrigerant liquid inlet pipe as a reference temperature; responding to the condition that the temperature of a refrigerant liquid inlet pipe is greater than or equal to the temperature of a middle pipe and the temperature difference value is greater than or equal to a preset difference threshold value, and taking the temperature of the middle pipe as a reference temperature; in response to the fact that the temperature of the refrigerant liquid inlet pipe is greater than or equal to the temperature of the middle pipe and the temperature difference value is smaller than a preset difference threshold value, taking the temperature average value of the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe of the indoor heat exchanger as a reference temperature; and controlling the air conditioner to be switched to an anti-freezing mode in response to the reference temperature meeting a preset anti-freezing condition. The air conditioner and the anti-freezing control method thereof can trigger the anti-freezing protection of the air conditioner more timely and sensitively.

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 existing air conditioner is generally only provided with a single temperature sensor at the middle position of an indoor heat exchanger of an indoor unit of the air conditioner, and whether the freezing problem exists is judged only through the value of a single temperature parameter detected by the temperature sensor, and because the low-temperature refrigerant flows through a plurality of branch pipe flow paths of the indoor heat exchanger, when the branch pipe flow path position at a non-middle position freezes, the temperature sensor arranged at the middle position is not sensitive to the low-temperature sensing of the temperature sensor, which easily causes the whole freezing problem of the indoor heat exchanger of the air conditioner to be serious and then is easily sensed by the temperature sensor, so that the requirement of the air conditioner on timely and sensitive triggering of anti-freezing protection of the air conditioner cannot be met.
Disclosure of Invention
The invention provides an air conditioner and an anti-freezing method thereof, aiming at solving the defect that the traditional air conditioner is insensitive to anti-freezing protection triggering caused by adopting a single temperature sensor to sense the temperature of a coil. 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, a liquid inlet of the indoor heat exchanger is provided with a first sensor for detecting the temperature of a liquid inlet pipe of a refrigerant, and the middle part of the indoor heat exchanger is provided with a second sensor for detecting the temperature of a middle pipe of the indoor heat exchanger; the control method comprises the following steps:
acquiring the temperature of a refrigerant liquid inlet pipe and the temperature of a middle pipe of an indoor heat exchanger in the refrigeration mode of air conditioner operation;
comparing the numerical values of the refrigerant liquid inlet pipe temperature and the middle pipe temperature and calculating the temperature difference value of the refrigerant liquid inlet pipe temperature and the middle pipe temperature;
responding to the temperature of a refrigerant liquid inlet pipe to be less than the temperature of a middle pipe, and taking the temperature of the refrigerant liquid inlet pipe as a reference temperature; responding to the condition that the temperature of a refrigerant liquid inlet pipe is greater than or equal to the temperature of a middle pipe and the temperature difference value is greater than or equal to a preset difference threshold value, and taking the temperature of the middle pipe as a reference temperature; in response to the fact that the temperature of the refrigerant liquid inlet pipe is greater than or equal to the temperature of the middle pipe and the temperature difference value is smaller than a preset difference threshold value, taking the temperature average value of the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe of the indoor heat exchanger as a reference temperature;
determining whether a preset anti-freezing condition is met or not according to the reference temperature;
controlling the air conditioner to be switched to an anti-freezing mode in response to the reference temperature meeting a preset anti-freezing condition; if the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe meet a first temperature condition, the anti-freezing mode comprises increasing the opening degree of the throttling device; if the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe meet a second temperature condition, the anti-freezing mode comprises the step of reducing the frequency of the compressor; and if the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe meet the third temperature condition, the anti-freezing mode comprises the steps of increasing the opening degree of the throttling device and increasing the rotating speed of the internal fan.
In an alternative embodiment, the determining whether the preset anti-freezing condition is satisfied according to the reference temperature includes:
comparing the reference temperature with a preset temperature threshold; the preset anti-freezing condition comprises that the reference temperature is less than a temperature threshold value;
if the reference temperature is less than the temperature threshold value, the anti-freezing condition is met; and if the reference temperature is greater than or equal to the temperature threshold value, the anti-freezing condition is not met.
In an optional embodiment, controlling the air conditioner to switch to the freeze prevention mode further comprises:
and controlling the air conditioner to be switched to a heating mode for operation.
In an optional embodiment, the control method further comprises:
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 cold and medium temperature.
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 medium temperature, Td is the exhaust temperature of the compressor, Tc is the refrigerant liquid inlet pipe temperature of the indoor heat exchanger, A is a first calculation coefficient associated with the cold medium, B is a second calculation coefficient associated with the refrigerant liquid inlet pipe temperature, and D is a calculation constant.
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 first sensor for detecting the temperature of a refrigerant liquid inlet pipe, and the middle part of the indoor heat exchanger is provided with a second sensor for detecting the temperature of a middle pipe of the indoor heat exchanger; the air conditioner further includes a controller for:
acquiring the temperature of a refrigerant liquid inlet pipe and the temperature of a middle pipe of an indoor heat exchanger in the refrigeration mode of air conditioner operation;
comparing the numerical values of the refrigerant liquid inlet pipe temperature and the middle pipe temperature and calculating the temperature difference value of the refrigerant liquid inlet pipe temperature and the middle pipe temperature;
responding to the temperature of a refrigerant liquid inlet pipe to be less than the temperature of a middle pipe, and taking the temperature of the refrigerant liquid inlet pipe as a reference temperature; responding to the condition that the temperature of a refrigerant liquid inlet pipe is greater than or equal to the temperature of a middle pipe and the temperature difference value is greater than or equal to a preset difference threshold value, and taking the temperature of the middle pipe as a reference temperature; in response to the fact that the temperature of the refrigerant liquid inlet pipe is greater than or equal to the temperature of the middle pipe and the temperature difference value is smaller than a preset difference threshold value, taking the temperature average value of the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe of the indoor heat exchanger as a reference temperature;
determining whether a preset anti-freezing condition is met or not according to the reference temperature;
controlling the air conditioner to be switched to an anti-freezing mode in response to the reference temperature meeting a preset anti-freezing condition; if the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe meet a first temperature condition, the anti-freezing mode comprises increasing the opening degree of the throttling device; if the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe meet a second temperature condition, the anti-freezing mode comprises the step of reducing the frequency of the compressor; and if the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe meet the third temperature condition, the anti-freezing mode comprises the steps of increasing the opening degree of the throttling device and increasing the rotating speed of the internal fan.
In an alternative embodiment, the controller is specifically configured to:
comparing the reference temperature with a preset temperature threshold; the preset anti-freezing condition comprises that the reference temperature is less than a temperature threshold value;
if the reference temperature is less than the temperature threshold value, the anti-freezing condition is met; and if the reference temperature is greater than or equal to the temperature threshold value, the anti-freezing condition is not met.
In an alternative embodiment, the controller is specifically configured to:
and controlling the air conditioner to be switched to a heating mode for operation.
In an alternative embodiment, the controller is further configured to:
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 cold and medium temperature.
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 medium temperature, Td is the exhaust temperature of the compressor, Tc is the refrigerant liquid inlet pipe temperature of the indoor heat exchanger, A is a first calculation coefficient associated with the cold medium, B is a second calculation coefficient associated with the refrigerant liquid inlet pipe temperature, and D is a calculation constant.
The invention adopts the technical scheme and has the beneficial effects that:
the air conditioner and the anti-freezing control method thereof provided by the invention have the advantages that the two temperature sensors arranged at the liquid inlet and the middle position of the indoor heat exchanger are used for respectively detecting the pipe temperatures at the corresponding positions, the judgment operation of the freezing problem of the air conditioner is carried out according to the numerical values of the two pipe temperatures, and the anti-freezing mode can be timely switched when the freezing problem is judged to occur; compared with the mode of judging the anti-freezing through the temperature of a single coil in the prior art, the anti-freezing protection device can trigger the anti-freezing protection of the device more timely and sensitively.
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 the present invention, in accordance with still another exemplary embodiment;
FIG. 6 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. 7 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. 8 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, acquiring a refrigerant liquid inlet pipe temperature and a middle pipe temperature of an indoor heat exchanger in a refrigeration mode of air conditioner operation;
in this embodiment, the air conditioner includes an indoor heat exchanger and a compressor, a liquid inlet of the indoor heat exchanger is provided with a first sensor for detecting the temperature of a refrigerant liquid inlet pipe, and the middle part of the indoor heat exchanger is provided with a second sensor for detecting the temperature of a middle pipe of the indoor heat exchanger;
therefore, when the air conditioner operates in the refrigeration mode, the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe of the indoor heat exchanger, which are obtained in the step S101, can be respectively detected by the first sensor and the second sensor;
s102, determining whether a preset anti-freezing condition is met or not according to the minimum pipe temperature of a refrigerant liquid inlet pipe temperature and a middle pipe temperature of the indoor heat exchanger;
the air conditioner in the prior art is generally controlled to prevent freezing only by judging whether the air conditioner has a freezing problem according to the temperature of a coil pipe detected at the middle position of an indoor heat exchanger, but the air conditioner in the prior art has the disadvantages that: when the heat exchange pipeline far away from the middle position of the indoor heat exchanger freezes, for example, the heat exchange pipeline near the refrigerant liquid inlet pipe orifice of the indoor heat exchanger freezes, the temperature of the frozen heat exchange pipeline is generally lower than that of the middle position, but because the temperature sensor is far away from the middle position, the temperature detected by the temperature sensor is close to the temperature of the current middle position, and therefore the temperature reduction condition of the heat exchange pipeline far away from the middle position and the freezing problem caused by temperature reduction cannot be timely found.
The temperature sensor is additionally arranged at the outlet of the refrigerant liquid inlet pipe of the indoor heat exchanger of the indoor unit, and can be used for detecting the temperature of the refrigerant liquid inlet pipe before the refrigerant is distributed to a plurality of heat exchange pipelines of the indoor heat exchanger; in this way, in the step S102, the minimum pipe temperature and the anti-freezing condition of the refrigerant inlet pipe temperature and the middle pipe temperature of the indoor heat exchanger are used for judging the anti-freezing operation, so that the real-time sensing of the overall temperature condition of the indoor heat exchanger is effectively improved, and the freezing problem of the local heat exchange pipeline of the indoor heat exchanger can be responded timely.
Optionally, the preset anti-freezing condition includes that the minimum pipe temperature is less than a temperature threshold value. Therefore, in step S102, determining whether the preset anti-freezing condition is met according to the minimum pipe temperature of the refrigerant inlet pipe temperature and the middle pipe temperature of the indoor heat exchanger may specifically include: comparing the minimum pipe temperature with a preset temperature threshold value; if the minimum pipe temperature is less than the temperature threshold value, the anti-freezing condition is met; and if the minimum pipe temperature is greater than or equal to the temperature threshold value, the anti-freezing condition is not met.
For example, the preset temperature threshold is-1 ℃, if the temperature of the refrigerant liquid inlet pipe detected by the first sensor is 1 ℃ and the temperature of the middle pipe detected by the second sensor is 2 ℃, the temperature of the refrigerant liquid inlet pipe is taken as the minimum pipe temperature, and then 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 first sensor is-3 ℃ and the temperature of the middle pipe detected by the second sensor is 0 ℃, the temperature of the refrigerant liquid inlet pipe is taken as the minimum pipe temperature, and then the freezing problem of the indoor heat exchanger of the air conditioner can be determined through comparison.
Or, the air conditioner may also adopt a flow for performing anti-freezing judgment based on the coil temperature in the prior art, and the control flow in the present invention is a flow for performing anti-freezing judgment based on the minimum pipe temperature in the prior art;
s103, controlling the air conditioner to be switched to an anti-freezing mode in response to the fact that the minimum pipe temperature meets a preset anti-freezing condition.
The air conditioner and the anti-freezing control method thereof provided by the invention have the advantages that the two temperature sensors arranged at the liquid inlet and the middle position of the indoor heat exchanger are used for respectively detecting the pipe temperatures at the corresponding positions, the judgment operation of the freezing problem of the air conditioner is carried out according to the numerical values of the two pipe temperatures, and the anti-freezing mode can be timely switched when the freezing problem is judged to occur; compared with the mode of judging the anti-freezing through the temperature of a single coil in the prior art, the anti-freezing protection device can trigger the anti-freezing protection of the device more timely and sensitively.
Optionally, when the minimum pipe temperature meets a preset anti-freezing condition, 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 S101, 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.
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.
In the control flow of the invention, in addition to the load protection in the heating mode through the middle pipe temperature detected by the second sensor, the invention can also utilize the refrigerant liquid inlet pipe temperature detected by the first sensor to perform the load protection. The first sensor is arranged at the position of a pipe orifice corresponding to a refrigerant flowing into an indoor heat exchanger when an 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.
Therefore, the process of the invention can not only judge the anti-freezing protection of the indoor heat exchanger according to the temperature of the middle pipe and 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 second sensor arranged at the middle position of the indoor heat exchanger, so that the accurate judgment of the heat load protection can be realized.
Specifically, for the problem of load protection in the heating mode, the control method of the present invention further includes: 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 cold and medium temperature.
Here, the operation flow related to the air conditioner load protection may be applied to a flow in which the air conditioner starts the heating mode in severe cold weather in winter, and may also be applied to the load protection operation when the heating mode is used for the anti-freezing protection in step S103.
In this embodiment, the exhaust pipe orifice of the compressor of the air conditioner is further provided with another temperature sensor, and the temperature sensor can be used for detecting the obtained exhaust temperature of the compressor;
meanwhile, the temperature of the refrigerant liquid inlet pipe is also detected by the first sensor in the foregoing, and it should be noted that the temperature of the refrigerant liquid inlet pipe detected by the first sensor in the load protection process is the temperature of the high-temperature refrigerant flowing out of the pipe orifice 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).
Optionally, according to the exhaust temperature of compressor and the refrigerant feed liquor pipe temperature of indoor heat exchanger, confirm cold medium temperature, include: 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, in the load protection operation of the air conditioner according to the cold-medium temperature, whether the air conditioner needs to perform the load protection operation or not can be judged according to the cold-medium temperature; 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 S102), 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.
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, acquiring a refrigerant liquid inlet pipe temperature and a middle pipe temperature of an indoor heat exchanger in a refrigeration mode of air conditioner operation;
in this embodiment, the specific execution flow of step S201 may refer to step S101 in the foregoing, which is not described herein again;
s202, calculating a temperature difference value between a liquid inlet pipe temperature and a middle pipe temperature of a refrigerant;
here, step S202 is to take an absolute value of a temperature difference between a refrigerant inlet pipe temperature and a middle pipe temperature;
s2031, responding to the temperature difference value smaller than or equal to a preset difference threshold value, and taking the temperature average value of the refrigerant liquid inlet pipe temperature and the middle pipe temperature as a reference temperature; executing step S204;
s2032, responding to the temperature difference value being larger than a preset difference threshold value, and taking the minimum pipe temperature of the refrigerant liquid inlet pipe temperature and the middle pipe temperature of the indoor heat exchanger as a reference temperature; executing step S204;
the difference threshold values in step S2031 and step S2032 are also threshold parameters preset by the air conditioner.
Here, when the temperature difference value between the refrigerant liquid inlet pipe temperature and the middle pipe temperature is less than or equal to the preset difference threshold value, it indicates that the temperature difference between the refrigerant liquid inlet pipe temperature and the middle pipe temperature is small, and the refrigerant is distributed in the indoor heat exchanger more uniformly, step S2031 is executed, and the temperature mean value of the refrigerant liquid inlet pipe temperature and the middle pipe temperature is used as a reference temperature for judging the anti-freezing condition; when the temperature difference value between the refrigerant inlet pipe temperature and the middle pipe temperature is greater than the preset difference threshold value, it indicates that the temperature difference between the refrigerant inlet pipe temperature and the middle pipe temperature is large, and the refrigerant is not uniformly distributed in the indoor heat exchanger, step S2031 is executed, and the minimum pipe temperature between the refrigerant inlet pipe temperature and the middle pipe temperature is used as the reference temperature for judging the anti-freezing condition.
S204, determining whether a preset anti-freezing condition is met or not according to the reference temperature;
optionally, the preset anti-freezing condition includes that the reference temperature is less than a temperature threshold;
s205, responding to the fact that the reference temperature meets the preset anti-freezing condition, and controlling the air conditioner to be switched to the anti-freezing mode.
In this embodiment, the specific execution flow of step S204 to step S205 may refer to step S102 to step S103 in the foregoing, which is not described herein again.
The air conditioner and the anti-freezing control method thereof provided by the invention have the advantages that the two temperature sensors arranged at the liquid inlet and the middle position of the indoor heat exchanger are used for respectively detecting the pipe temperatures at the corresponding positions, the judgment operation of the freezing problem of the air conditioner is carried out according to the numerical values of the two pipe temperatures, and the anti-freezing mode can be timely switched when the freezing problem is judged to occur; compared with the mode of judging the anti-freezing through the temperature of a single coil in the prior art, the anti-freezing protection device can trigger the anti-freezing protection of the device more timely and sensitively.
Optionally, controlling the air conditioner to switch to the anti-freezing mode further includes: and controlling the air conditioner to be switched to a heating mode for operation.
Optionally, the control method of the present invention further includes: 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 cold and medium temperature.
Specifically, according to the exhaust temperature of the compressor and the refrigerant feed pipe temperature of the indoor heat exchanger, the cold medium temperature is determined, and the method comprises the following steps: 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 exhaust temperature of the compressor, Tc is the refrigerant liquid inlet pipe temperature of the indoor heat exchanger, A is a first calculation coefficient associated with the cold medium, B is a second calculation coefficient associated with the refrigerant liquid inlet pipe temperature, and D is a calculation constant.
Here, the specific flow for performing the judgment of load protection and the protection operation on the air conditioner may refer to the description of the corresponding part in the embodiment shown in fig. 1, and is not described herein again.
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, acquiring a refrigerant liquid inlet pipe temperature and a middle pipe temperature of the indoor heat exchanger in the air conditioner operation refrigeration mode;
in this embodiment, the specific execution flow of step S301 may refer to step S101 in the foregoing, which is not described herein again;
s302, comparing the numerical values of the refrigerant liquid inlet pipe temperature and the middle pipe temperature and calculating the temperature difference value of the refrigerant liquid inlet pipe temperature and the middle pipe temperature;
here, step S302 is to take an absolute value of a temperature difference between a refrigerant inlet pipe temperature and a middle pipe temperature;
s3031, responding to the temperature of the refrigerant liquid inlet pipe being less than the temperature of the middle pipe, and taking the temperature of the refrigerant liquid inlet pipe as a reference temperature; executing the step S304;
s3032, responding to the fact that the temperature of the liquid inlet pipe of the refrigerant is larger than or equal to the temperature of the middle pipe and the temperature difference value is larger than or equal to a preset difference threshold value, and taking the temperature of the middle pipe as a reference temperature; executing the step S304;
s3033, responding to the fact that the temperature of the refrigerant liquid inlet pipe is larger than or equal to the temperature of the middle pipe and the temperature difference value is smaller than a preset difference threshold value, and taking the temperature mean value of the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe of the indoor heat exchanger as a reference temperature; executing the step S304;
the difference threshold in steps S3032 and S3033 is also a threshold parameter preset by the air conditioner.
S304, determining whether a preset anti-freezing condition is met or not according to the reference temperature;
in this embodiment, the specific execution flow of step S304 may refer to step S204 in the foregoing, which is not described herein again.
S305, controlling the air conditioner to be switched to an anti-freezing mode in response to the fact that the reference temperature meets a preset anti-freezing condition;
optionally, the controlling the air conditioner to switch the anti-freezing mode in step S305 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 an electric auxiliary heating device of the indoor unit, and enabling the operation duration of the electric auxiliary heating professional to be the set duration 5min, wherein the set duration is the second period duration; 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; after the process is executed in each period, executing step S301 to step S304 again, if the newly determined indoor heat exchanger of the air conditioner does not have the freezing problem, exiting the anti-freezing mode, and at this time, switching the air conditioner 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.
The air conditioner and the anti-freezing control method thereof provided by the invention have the advantages that the two temperature sensors arranged at the liquid inlet and the middle position of the indoor heat exchanger are used for respectively detecting the pipe temperatures at the corresponding positions, the judgment operation of the freezing problem of the air conditioner is carried out according to the numerical values of the two pipe temperatures, and the anti-freezing mode can be timely switched when the freezing problem is judged to occur; compared with the mode of judging the anti-freezing through the temperature of a single coil in the prior art, the anti-freezing protection device can trigger the anti-freezing protection of the device more timely and sensitively.
Optionally, controlling the air conditioner to switch to the anti-freezing mode further includes: and controlling the air conditioner to be switched to a heating mode for operation.
Optionally, the control method of the present invention further includes: 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 cold and medium temperature.
Specifically, according to the exhaust temperature of the compressor and the refrigerant feed pipe temperature of the indoor heat exchanger, the cold medium temperature is determined, and the method comprises the following steps: 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 exhaust temperature of the compressor, Tc is the refrigerant liquid inlet pipe temperature of the indoor heat exchanger, A is a first calculation coefficient associated with the cold medium, B is a second calculation coefficient associated with the refrigerant liquid inlet pipe temperature, and D is a calculation constant.
Here, the specific flow for performing the judgment of load protection and the protection operation on the air conditioner may refer to the description of the corresponding part in the embodiment shown in fig. 1, and is not described herein again.
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, acquiring a refrigerant liquid inlet pipe temperature and a middle pipe temperature of an indoor heat exchanger in a refrigeration mode of air conditioner operation;
in this embodiment, the specific execution flow of step S401 may refer to step S101 in the foregoing, which is not described herein again;
s402, comparing the numerical values of the refrigerant liquid inlet pipe temperature and the middle pipe temperature and calculating the temperature difference value of the refrigerant liquid inlet pipe temperature and the middle pipe temperature;
here, step S402 is to take an absolute value of a temperature difference between the refrigerant inlet pipe temperature and the middle pipe temperature;
s4031, responding to the temperature of a refrigerant liquid inlet pipe is smaller than the temperature of a middle pipe, and taking the temperature of the refrigerant liquid inlet pipe as a reference temperature; step S404 is executed;
s4032, responding to the situation that the temperature of the refrigerant liquid inlet pipe is greater than or equal to the temperature of the middle pipe and the temperature difference value is greater than or equal to a preset difference threshold value, and taking the temperature of the middle pipe as a reference temperature; step S404 is executed;
s4033, in response to the fact that the temperature of the refrigerant liquid inlet pipe is greater than or equal to the temperature of the middle pipe and the temperature difference value is smaller than a preset difference threshold value, taking the temperature mean value of the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe of the indoor heat exchanger as a reference temperature; step S404 is executed;
the difference threshold in step S4032 and step S4033 is also a threshold parameter preset by the air conditioner.
S404, determining whether a preset anti-freezing condition is met or not according to the reference temperature;
in this embodiment, the specific execution flow of step S404 may refer to step S204 in the foregoing, which is not described herein again.
S405, controlling the air conditioner to be switched to an anti-freezing mode in response to the fact that the reference temperature meets a preset anti-freezing condition;
optionally, the controlling the air conditioner to switch the anti-freezing mode in step S405 includes: if the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe meet a first temperature condition, the anti-freezing mode comprises increasing the opening degree of the throttling device; if the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe meet a second temperature condition, the anti-freezing mode comprises the step of reducing the frequency of the compressor; if the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe meet a third temperature condition, the anti-freezing mode comprises the steps of increasing the opening degree of the throttling device and increasing the rotating speed of the internal fan;
here, the flow of each anti-freeze mode has a set cycle length.
Illustratively, the first temperature condition is that the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe are both smaller than a first temperature threshold and larger than a second temperature threshold, optionally, the value of the first temperature threshold is 5 ℃, and the value of the second temperature threshold is 0 ℃; the second temperature condition is that the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe are both less than a second temperature threshold; the third temperature condition is that one of the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe is less than a second temperature threshold;
for example, in response to the freezing problem of the indoor heat exchanger of the air conditioner, the refrigerant inlet pipe temperature t1 and the middle pipe temperature t2 are compared with the first temperature threshold and the second temperature threshold in numerical value; when the temperature is more than 0 ℃ and less than t1 and less than 5 ℃ and the temperature is more than 0 ℃ and less than t2 and less than 5 ℃, increasing the opening degree of the throttling device to a set opening degree value, and enabling the time for maintaining the set opening degree value of the throttling device to be the first cycle duration 30 min; when t1 is less than 0 ℃ and t2 is less than 0 ℃, reducing the frequency of the compressor to a set frequency, and enabling the time for maintaining the set frequency of the compressor to be the second period time length of 10 min; and when t1 is less than 0 ℃ or t2 is less than 0 ℃, increasing the opening degree of the throttling device to a set opening degree value, increasing the rotating speed of the inner fan to a set rotating speed, and enabling the time for maintaining the set opening degree value and the set rotating speed of the position of the inner fan by the throttling device to be 5min in the third period.
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; after the process is executed in each period, executing step S401 to step S404 again, if the newly determined indoor heat exchanger of the air conditioner does not have the freezing problem, exiting the anti-freezing mode, and at this time, switching the air conditioner 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.
The air conditioner and the anti-freezing control method thereof provided by the invention have the advantages that the two temperature sensors arranged at the liquid inlet and the middle position of the indoor heat exchanger are used for respectively detecting the pipe temperatures at the corresponding positions, the judgment operation of the freezing problem of the air conditioner is carried out according to the numerical values of the two pipe temperatures, and the anti-freezing mode can be timely switched when the freezing problem is judged to occur; compared with the mode of judging the anti-freezing through the temperature of a single coil in the prior art, the anti-freezing protection device can trigger the anti-freezing protection of the device more timely and sensitively.
Optionally, controlling the air conditioner to switch to the anti-freezing mode further includes: and controlling the air conditioner to be switched to a heating mode for operation.
Optionally, the control method of the present invention further includes: 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 cold and medium temperature.
Specifically, according to the exhaust temperature of the compressor and the refrigerant feed pipe temperature of the indoor heat exchanger, the cold medium temperature is determined, and the method comprises the following steps: 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 exhaust temperature of the compressor, Tc is the refrigerant liquid inlet pipe temperature of the indoor heat exchanger, A is a first calculation coefficient associated with the cold medium, B is a second calculation coefficient associated with the refrigerant liquid inlet pipe temperature, and D is a calculation constant.
Here, the specific flow for performing the judgment of load protection and the protection operation on the air conditioner may refer to the description of the corresponding part in the embodiment shown in fig. 1, and is not described herein again.
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, acquiring a refrigerant liquid inlet pipe temperature and a middle pipe temperature of an indoor heat exchanger in a refrigeration mode of air conditioner operation;
s502, determining whether a preset anti-freezing condition is met according to the minimum pipe temperature of the refrigerant liquid inlet pipe temperature and the middle pipe temperature of the indoor heat exchanger;
in this embodiment, the specific execution flow of step S501 and step S502 may refer to the embodiment shown in fig. 1, which is not described herein again;
s503, responding to the fact that the minimum pipe temperature meets a preset anti-freezing condition, and determining and controlling the air conditioner to be switched to a corresponding anti-freezing mode according to the minimum pipe temperature;
specifically, if the minimum pipe temperature satisfies the first temperature condition, the anti-freezing mode includes decreasing the frequency of the compressor; if the minimum pipe temperature meets the second temperature condition, the anti-freezing mode comprises controlling the air conditioner to stop; different minimum tube temperatures correspond to different temperature conditions.
Illustratively, when the minimum tube temperature is the middle tube temperature, the first temperature condition is that the middle tube temperature is less than a first temperature threshold and greater than a second temperature threshold, optionally, the first temperature threshold is 6 ℃ and the second temperature threshold is 4 ℃; the second temperature condition is that the middle pipe temperature is less than a second temperature threshold;
for example, when the minimum pipe temperature is the middle pipe temperature t1 and the middle pipe temperature satisfies the anti-freezing condition preset in step S502, if 4 ℃ < t1 < 6 ℃, the air conditioner performs the anti-freezing mode of reducing the frequency of the compressor; and if t1 is less than 4 ℃, the air conditioner performs anti-freezing operation to control the air conditioner to stop.
When the minimum pipe temperature is the refrigerant liquid inlet pipe temperature, the first temperature condition is that the refrigerant liquid inlet pipe temperature is smaller than a third temperature threshold and larger than a fourth temperature threshold, optionally, the value of the third temperature threshold is 4 ℃, and the value of the fourth temperature threshold is 2 ℃; the second temperature condition is that the temperature of a refrigerant liquid inlet pipe is less than a fourth temperature threshold;
for example, when the minimum pipe temperature is the refrigerant inlet pipe temperature t2 and the refrigerant inlet pipe temperature satisfies the anti-freezing condition preset in step S502, if 2 ℃ < t2 < 4 ℃, the anti-freezing mode executed by the air conditioner is to reduce the frequency of the compressor; and if t2 is less than 2 ℃, the air conditioner performs anti-freezing operation to control the air conditioner to stop.
Here, the corresponding temperature conditions are set according to different types of minimum pipe temperatures, so that the adjustment precision of the air conditioner anti-freezing protection can be improved, and the effect of the air conditioner anti-freezing operation can be improved.
The air conditioner and the anti-freezing control method thereof provided by the invention have the advantages that the two temperature sensors arranged at the liquid inlet and the middle position of the indoor heat exchanger are used for respectively detecting the pipe temperatures at the corresponding positions, the judgment operation of the freezing problem of the air conditioner is carried out according to the numerical values of the two pipe temperatures, and the anti-freezing mode adapting to different pipe temperatures can be timely switched when the freezing problem is judged to occur; compared with the mode of judging the anti-freezing through the temperature of a single coil in the prior art, the anti-freezing protection device can trigger the anti-freezing protection of the device more timely and sensitively.
Optionally, controlling the air conditioner to switch to the anti-freezing mode further includes: and controlling the air conditioner to be switched to a heating mode for operation.
Optionally, the control method of the present invention further includes: 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 cold and medium temperature.
Specifically, according to the exhaust temperature of the compressor and the refrigerant feed pipe temperature of the indoor heat exchanger, the cold medium temperature is determined, and the method comprises the following steps: 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 exhaust temperature of the compressor, Tc is the refrigerant liquid inlet pipe temperature of the indoor heat exchanger, A is a first calculation coefficient associated with the cold medium, B is a second calculation coefficient associated with the refrigerant liquid inlet pipe temperature, and D is a calculation constant.
Here, the specific flow for performing the judgment of load protection and the protection operation on the air conditioner may refer to the description of the corresponding part in the embodiment shown in fig. 1, and is not described herein again.
Fig. 6 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. 6, 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:
s601, obtaining a refrigerant liquid inlet pipe temperature and a middle pipe temperature of the indoor heat exchanger in the air conditioner operation refrigeration mode;
s602, calculating a temperature difference value between a liquid inlet pipe temperature and a middle pipe temperature of a refrigerant;
s6031, responding to the temperature difference value smaller than or equal to a preset difference threshold value, and taking the temperature average value of the refrigerant liquid inlet pipe temperature and the middle pipe temperature as a reference temperature;
s6032, responding to the temperature difference value larger than a preset difference threshold value, and taking the minimum pipe temperature of the refrigerant liquid inlet pipe temperature and the middle pipe temperature of the indoor heat exchanger as a reference temperature;
s604, determining whether a preset anti-freezing condition is met according to the reference temperature;
in this embodiment, the specific execution flow from step S601 to step S604 may refer to the embodiment shown in fig. 2, which is not described herein again;
s605, responding to the fact that the reference temperature meets a preset anti-freezing condition, and determining and controlling the air conditioner to be switched to a corresponding anti-freezing mode according to the reference temperature;
specifically, if the reference temperature satisfies the first temperature condition, the anti-freeze mode includes decreasing the frequency of the compressor; if the reference temperature meets the second temperature condition, the anti-freezing mode comprises controlling the air conditioner to stop; the temperature conditions corresponding to different reference temperatures are different.
For example, when the reference temperature is a temperature mean value, the first temperature condition is that the temperature mean value is smaller than a first temperature threshold and larger than a second temperature threshold, optionally, the value of the first temperature threshold is 6 ℃, and the value of the second temperature threshold is 4 ℃; the second temperature condition is that the temperature mean value is smaller than a second temperature threshold value;
for example, when the reference temperature is the temperature mean value t1 and the temperature mean value satisfies the anti-freezing condition preset in step S602, if 4 ℃ < t1 < 6 ℃, the air conditioner performs the anti-freezing mode of reducing the frequency of the compressor; and if t1 is less than 4 ℃, the air conditioner performs anti-freezing operation to control the air conditioner to stop.
When the reference temperature is the minimum tube temperature, the first temperature condition is that the minimum tube temperature is smaller than a third temperature threshold and larger than a fourth temperature threshold, optionally, the value of the third temperature threshold is 4 ℃, and the value of the fourth temperature threshold is 2 ℃; the second temperature condition is that the minimum tube temperature is less than a fourth temperature threshold;
for example, when the reference temperature is the minimum pipe temperature t2 and the minimum pipe temperature satisfies the anti-freezing condition preset in step S602, if 2 ℃ < t2 < 4 ℃, the air conditioner performs the anti-freezing mode of reducing the frequency of the compressor; and if t2 is less than 2 ℃, the air conditioner performs anti-freezing operation to control the air conditioner to stop.
Here, the adjustment accuracy of the anti-freezing protection of the air conditioner can be improved by setting the corresponding temperature conditions according to the different types of the reference temperatures, respectively, thereby improving the effect of the anti-freezing operation of the air conditioner.
The air conditioner and the anti-freezing control method thereof provided by the invention have the advantages that the two temperature sensors arranged at the liquid inlet and the middle position of the indoor heat exchanger are used for respectively detecting the pipe temperatures at the corresponding positions, the judgment operation of the freezing problem of the air conditioner is carried out according to the numerical values of the two pipe temperatures, and the anti-freezing mode adapting to different pipe temperatures can be timely switched when the freezing problem is judged to occur; compared with the mode of judging the anti-freezing through the temperature of a single coil in the prior art, the anti-freezing protection device can trigger the anti-freezing protection of the device more timely and sensitively.
Optionally, controlling the air conditioner to switch to the anti-freezing mode further includes: and controlling the air conditioner to be switched to a heating mode for operation.
Optionally, the control method of the present invention further includes: 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 cold and medium temperature.
Specifically, according to the exhaust temperature of the compressor and the refrigerant feed pipe temperature of the indoor heat exchanger, the cold medium temperature is determined, and the method comprises the following steps: 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 exhaust temperature of the compressor, Tc is the refrigerant liquid inlet pipe temperature of the indoor heat exchanger, A is a first calculation coefficient associated with the cold medium, B is a second calculation coefficient associated with the refrigerant liquid inlet pipe temperature, and D is a calculation constant.
Here, the specific flow for performing the judgment of load protection and the protection operation on the air conditioner may refer to the description of the corresponding part in the embodiment shown in fig. 1, and is not described herein again.
Fig. 7 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. 7, 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:
s701, acquiring a refrigerant liquid inlet pipe temperature and a middle pipe temperature of the indoor heat exchanger in the air conditioner operation refrigeration mode;
s702, determining whether a preset anti-freezing condition is met according to the minimum pipe temperature of a refrigerant liquid inlet pipe temperature and a middle pipe temperature of the indoor heat exchanger;
optionally, the specific execution flow of steps S701 to S702 may refer to steps S101 to S102 in the foregoing, which is not described herein again.
S703, responding to the fact that the minimum pipe temperature meets a preset anti-freezing condition, and determining and controlling the air conditioner to be switched to a corresponding anti-freezing mode according to the minimum pipe temperature;
specifically, if the minimum pipe temperature satisfies the first temperature condition, the anti-freezing mode includes decreasing the frequency of the compressor; if the minimum pipe temperature meets the second temperature condition, the anti-freezing mode comprises starting an electric auxiliary heating device of the indoor unit; if the minimum pipe temperature meets the third temperature condition, the anti-freezing mode comprises controlling the air conditioner to stop; different minimum tube temperatures correspond to different temperature conditions.
Illustratively, when the minimum tube temperature is the middle tube temperature, the first temperature condition is that the middle tube temperature is less than a first temperature threshold and greater than a second temperature threshold, optionally, the first temperature threshold is 6 ℃ and the second temperature threshold is 4 ℃; the second temperature condition is that the middle pipe temperature is smaller than a second temperature threshold and larger than a third temperature threshold; the third temperature condition is that the middle pipe temperature is lower than a third temperature threshold, and optionally, the value of the third temperature threshold is 0 ℃;
for example, when the minimum pipe temperature is the middle pipe temperature t1 and the middle pipe temperature satisfies the anti-freezing condition preset in step S702, if 4 ℃ < t1 < 6 ℃, the air conditioner performs the anti-freezing mode of reducing the frequency of the compressor; if the temperature is more than 0 ℃ and less than t1 and less than 4 ℃, the anti-freezing operation executed by the air conditioner is to start the electric auxiliary heating device of the indoor unit; and if t1 is less than 0 ℃, performing anti-freezing operation on the air conditioner to control the air conditioner to stop.
When the minimum pipe temperature is the refrigerant liquid inlet pipe temperature, the first temperature condition is that the refrigerant liquid inlet pipe temperature is smaller than a fourth temperature threshold and larger than a fifth temperature threshold, optionally, the value of the fourth temperature threshold is 4 ℃, and the value of the fifth temperature threshold is 2 ℃; the second temperature condition is that the temperature of a refrigerant liquid inlet pipe is smaller than a fourth temperature threshold and larger than a sixth temperature threshold; the third temperature condition is that the temperature of a refrigerant liquid inlet pipe is less than a sixth temperature threshold, and optionally, the value of the sixth temperature threshold is 0 ℃;
for example, when the minimum pipe temperature is the refrigerant inlet pipe temperature t2 and the refrigerant inlet pipe temperature satisfies the anti-freezing condition preset in step S702, if 2 ℃ < t2 < 4 ℃, the anti-freezing mode executed by the air conditioner is to reduce the frequency of the compressor; if the temperature is more than 0 ℃ and less than t1 and less than 2 ℃, the anti-freezing operation executed by the air conditioner is to start the electric auxiliary heating device of the indoor unit; and if t2 is less than 0 ℃, performing anti-freezing operation on the air conditioner to control the air conditioner to stop.
Here, the corresponding temperature conditions are set according to different types of minimum pipe temperatures, so that the adjustment precision of the air conditioner anti-freezing protection can be improved, and the effect of the air conditioner anti-freezing operation can be improved.
The air conditioner and the anti-freezing control method thereof provided by the invention have the advantages that the two temperature sensors arranged at the liquid inlet and the middle position of the indoor heat exchanger are used for respectively detecting the pipe temperatures at the corresponding positions, the judgment operation of the freezing problem of the air conditioner is carried out according to the numerical values of the two pipe temperatures, and the anti-freezing mode adapting to different pipe temperatures can be timely switched when the freezing problem is judged to occur; compared with the mode of judging the anti-freezing through the temperature of a single coil in the prior art, the anti-freezing protection device can trigger the anti-freezing protection of the device more timely and sensitively.
Optionally, controlling the air conditioner to switch to the anti-freezing mode further includes: and controlling the air conditioner to be switched to a heating mode for operation.
Optionally, the control method of the present invention further includes: 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 cold and medium temperature.
Specifically, according to the exhaust temperature of the compressor and the refrigerant feed pipe temperature of the indoor heat exchanger, the cold medium temperature is determined, and the method comprises the following steps: 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 exhaust temperature of the compressor, Tc is the refrigerant liquid inlet pipe temperature of the indoor heat exchanger, A is a first calculation coefficient associated with the cold medium, B is a second calculation coefficient associated with the refrigerant liquid inlet pipe temperature, and D is a calculation constant.
Here, the specific flow for performing the judgment of load protection and the protection operation on the air conditioner may refer to the description of the corresponding part in the embodiment shown in fig. 1, and is not described herein again.
Fig. 8 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. 8, 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:
s801, acquiring a refrigerant liquid inlet pipe temperature and a middle pipe temperature of an indoor heat exchanger in a refrigeration mode of air conditioner operation;
s802, calculating a temperature difference value between a liquid inlet pipe temperature and a middle pipe temperature of a refrigerant;
s8031, responding to the temperature difference value being smaller than or equal to a preset difference threshold value, and taking the temperature average value of the refrigerant liquid inlet pipe temperature and the middle pipe temperature as a reference temperature;
s8032, responding to the temperature difference value being larger than a preset difference threshold value, and taking the minimum pipe temperature of the refrigerant liquid inlet pipe temperature and the middle pipe temperature of the indoor heat exchanger as a reference temperature;
s804, determining whether a preset anti-freezing condition is met or not according to the reference temperature;
in this embodiment, the specific execution flow of steps S801 to S804 may refer to steps S201 to S204 in the foregoing, which is not described herein again;
s805, responding to the fact that the reference temperature meets a preset anti-freezing condition, and determining and controlling the air conditioner to be switched to a corresponding anti-freezing mode according to the reference temperature;
specifically, if the reference temperature satisfies the first temperature condition, the anti-freeze mode includes decreasing the frequency of the compressor; if the reference temperature meets the second temperature condition, the anti-freezing mode comprises starting an electric auxiliary heating device of the indoor unit; if the reference temperature meets the third temperature condition, the anti-freezing mode comprises controlling the air conditioner to stop; the temperature conditions corresponding to different reference temperatures are different.
For example, when the reference temperature is a temperature mean value, the first temperature condition is that the temperature mean value is smaller than a first temperature threshold and larger than a second temperature threshold, optionally, the value of the first temperature threshold is 6 ℃, and the value of the second temperature threshold is 4 ℃; the second temperature condition is that the temperature mean value is smaller than a second temperature threshold and larger than a third temperature threshold; the third temperature condition is that the temperature mean value is smaller than a third temperature threshold, and optionally, the value of the third temperature threshold is 0 ℃;
for example, when the reference temperature is the temperature mean value t1 and the temperature mean value satisfies the anti-freezing condition preset in step S802, if 4 ℃ < t1 < 6 ℃, the air conditioner performs the anti-freezing mode of reducing the frequency of the compressor; if the temperature is more than 0 ℃ and less than t1 and less than 4 ℃, the anti-freezing operation executed by the air conditioner is to start the electric auxiliary heating device of the indoor unit; and if t1 is less than 0 ℃, performing anti-freezing operation on the air conditioner to control the air conditioner to stop.
When the reference temperature is the minimum tube temperature, the first temperature condition is that the minimum tube temperature is smaller than a fourth temperature threshold and larger than a fifth temperature threshold, optionally, the value of the fourth temperature threshold is 4 ℃, and the value of the fifth temperature threshold is 2 ℃; the second temperature condition is that the minimum tube temperature is less than the fourth temperature threshold and greater than the sixth temperature threshold; the third temperature condition is that the minimum tube temperature is less than a sixth temperature threshold, and optionally, the value of the sixth temperature threshold is 0 ℃;
for example, when the reference temperature is the minimum pipe temperature t2 and the minimum pipe temperature satisfies the anti-freezing condition preset in step S802, if 2 ℃ < t2 < 4 ℃, the air conditioner performs the anti-freezing mode of reducing the frequency of the compressor; if the temperature is more than 0 ℃ and less than t1 and less than 2 ℃, the anti-freezing operation executed by the air conditioner is to start the electric auxiliary heating device of the indoor unit; and if t2 is less than 0 ℃, performing anti-freezing operation on the air conditioner to control the air conditioner to stop.
Here, the adjustment accuracy of the anti-freezing protection of the air conditioner can be improved by setting the corresponding temperature conditions according to the different types of the reference temperatures, respectively, thereby improving the effect of the anti-freezing operation of the air conditioner.
The air conditioner and the anti-freezing control method thereof provided by the invention have the advantages that the two temperature sensors arranged at the liquid inlet and the middle position of the indoor heat exchanger are used for respectively detecting the pipe temperatures at the corresponding positions, the judgment operation of the freezing problem of the air conditioner is carried out according to the numerical values of the two pipe temperatures, and the anti-freezing mode adapting to different pipe temperatures can be timely switched when the freezing problem is judged to occur; compared with the mode of judging the anti-freezing through the temperature of a single coil in the prior art, the anti-freezing protection device can trigger the anti-freezing protection of the device more timely and sensitively.
Optionally, controlling the air conditioner to switch to the anti-freezing mode further includes: and controlling the air conditioner to be switched to a heating mode for operation.
Optionally, the control method of the present invention further includes: 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 cold and medium temperature.
Specifically, according to the exhaust temperature of the compressor and the refrigerant feed pipe temperature of the indoor heat exchanger, the cold medium temperature is determined, and the method comprises the following steps: 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 exhaust temperature of the compressor, Tc is the refrigerant liquid inlet pipe temperature of the indoor heat exchanger, A is a first calculation coefficient associated with the cold medium, B is a second calculation coefficient associated with the refrigerant liquid inlet pipe temperature, and D is a calculation constant.
Here, the specific flow for performing the judgment of load protection and the protection operation on the air conditioner may refer to the description of the corresponding part in the embodiment shown in fig. 1, and is 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. 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:
acquiring the temperature of a refrigerant liquid inlet pipe and the temperature of a middle pipe of an indoor heat exchanger in the refrigeration mode of air conditioner operation;
determining whether a preset anti-freezing condition is met or not according to the minimum pipe temperature of the refrigerant liquid inlet pipe temperature and the middle pipe temperature of the indoor heat exchanger;
and controlling the air conditioner to be switched to an anti-freezing mode in response to the fact that the minimum pipe temperature meets a preset anti-freezing condition.
In an alternative embodiment, the controller is specifically configured to:
comparing the minimum pipe temperature with a preset temperature threshold value; the preset anti-freezing condition comprises that the minimum pipe temperature is less than a temperature threshold value;
if the minimum pipe temperature is less than the temperature threshold value, the anti-freezing condition is met; and if the minimum pipe temperature is greater than or equal to the temperature threshold value, the anti-freezing condition is not met.
In an alternative embodiment, the controller is further configured to:
and controlling the air conditioner to be switched to a heating mode for operation.
In an alternative embodiment, the controller is further configured to:
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 cold and medium temperature.
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 medium temperature, Td is the exhaust temperature of the compressor, Tc is the refrigerant liquid inlet pipe temperature of the indoor heat exchanger, A is a first calculation coefficient associated with the cold medium, B is a second calculation coefficient associated with the refrigerant liquid inlet pipe temperature, and D is a calculation constant.
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:
acquiring the temperature of a refrigerant liquid inlet pipe and the temperature of a middle pipe of an indoor heat exchanger in the refrigeration mode of air conditioner operation;
calculating the temperature difference value of the liquid inlet pipe temperature and the middle pipe temperature of the refrigerant;
in response to the temperature difference value being smaller than or equal to the preset difference threshold value, taking the temperature mean value of the refrigerant liquid inlet pipe temperature and the middle pipe temperature as a reference temperature; in response to the temperature difference value being larger than a preset difference threshold value, taking the minimum pipe temperature of the refrigerant liquid inlet pipe temperature and the middle pipe temperature of the indoor heat exchanger as a reference temperature;
determining whether a preset anti-freezing condition is met or not according to the reference temperature;
and controlling the air conditioner to be switched to an anti-freezing mode in response to the reference temperature meeting a preset anti-freezing condition.
In an alternative embodiment, the controller is specifically configured to:
comparing the reference temperature with a preset temperature threshold; the preset anti-freezing condition comprises that the reference temperature is less than a temperature threshold value;
if the reference temperature is less than the temperature threshold value, the anti-freezing condition is met; and if the reference temperature is greater than or equal to the temperature threshold value, the anti-freezing condition is not met.
In an alternative embodiment, the controller is further configured to:
and controlling the air conditioner to be switched to a heating mode for operation.
In an alternative embodiment, the controller is further configured to:
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 cold and medium temperature.
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 medium temperature, Td is the exhaust temperature of the compressor, Tc is the refrigerant liquid inlet pipe temperature of the indoor heat exchanger, A is a first calculation coefficient associated with the cold medium, B is a second calculation coefficient associated with the refrigerant liquid inlet pipe temperature, and D is a calculation constant.
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:
acquiring the temperature of a refrigerant liquid inlet pipe and the temperature of a middle pipe of an indoor heat exchanger in the refrigeration mode of air conditioner operation;
comparing the numerical values of the refrigerant liquid inlet pipe temperature and the middle pipe temperature and calculating the temperature difference value of the refrigerant liquid inlet pipe temperature and the middle pipe temperature;
responding to the temperature of a refrigerant liquid inlet pipe to be less than the temperature of a middle pipe, and taking the temperature of the refrigerant liquid inlet pipe as a reference temperature; responding to the condition that the temperature of a refrigerant liquid inlet pipe is greater than or equal to the temperature of a middle pipe and the temperature difference value is greater than or equal to a preset difference threshold value, and taking the temperature of the middle pipe as a reference temperature; in response to the fact that the temperature of the refrigerant liquid inlet pipe is greater than or equal to the temperature of the middle pipe and the temperature difference value is smaller than a preset difference threshold value, taking the temperature average value of the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe of the indoor heat exchanger as a reference temperature;
determining whether a preset anti-freezing condition is met or not according to the reference temperature;
controlling the air conditioner to be switched to an anti-freezing mode in response to the reference temperature meeting a preset anti-freezing condition; 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; and if the determined indoor heat exchanger of the air conditioner is restarted and does not have the freezing problem, exiting the anti-freezing mode.
In an alternative embodiment, the controller is specifically configured to:
comparing the reference temperature with a preset temperature threshold; the preset anti-freezing condition comprises that the reference temperature is less than a temperature threshold value;
if the reference temperature is less than the temperature threshold value, the anti-freezing condition is met; and if the reference temperature is greater than or equal to the temperature threshold value, the anti-freezing condition is not met.
In an alternative embodiment, the controller is specifically configured to:
and controlling the air conditioner to be switched to a heating mode for operation.
In an alternative embodiment, the controller is further configured to:
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 cold and medium temperature.
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 medium temperature, Td is the exhaust temperature of the compressor, Tc is the refrigerant liquid inlet pipe temperature of the indoor heat exchanger, A is a first calculation coefficient associated with the cold medium, B is a second calculation coefficient associated with the refrigerant liquid inlet pipe temperature, and D is a calculation constant.
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:
acquiring the temperature of a refrigerant liquid inlet pipe and the temperature of a middle pipe of an indoor heat exchanger in the refrigeration mode of air conditioner operation;
comparing the numerical values of the refrigerant liquid inlet pipe temperature and the middle pipe temperature and calculating the temperature difference value of the refrigerant liquid inlet pipe temperature and the middle pipe temperature;
responding to the temperature of a refrigerant liquid inlet pipe to be less than the temperature of a middle pipe, and taking the temperature of the refrigerant liquid inlet pipe as a reference temperature; responding to the condition that the temperature of a refrigerant liquid inlet pipe is greater than or equal to the temperature of a middle pipe and the temperature difference value is greater than or equal to a preset difference threshold value, and taking the temperature of the middle pipe as a reference temperature; in response to the fact that the temperature of the refrigerant liquid inlet pipe is greater than or equal to the temperature of the middle pipe and the temperature difference value is smaller than a preset difference threshold value, taking the temperature average value of the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe of the indoor heat exchanger as a reference temperature;
determining whether a preset anti-freezing condition is met or not according to the reference temperature;
controlling the air conditioner to be switched to an anti-freezing mode in response to the reference temperature meeting a preset anti-freezing condition; if the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe meet a first temperature condition, the anti-freezing mode comprises increasing the opening degree of the throttling device; if the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe meet a second temperature condition, the anti-freezing mode comprises the step of reducing the frequency of the compressor; and if the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe meet the third temperature condition, the anti-freezing mode comprises the steps of increasing the opening degree of the throttling device and increasing the rotating speed of the internal fan.
In an alternative embodiment, the controller is specifically configured to:
comparing the reference temperature with a preset temperature threshold; the preset anti-freezing condition comprises that the reference temperature is less than a temperature threshold value;
if the reference temperature is less than the temperature threshold value, the anti-freezing condition is met; and if the reference temperature is greater than or equal to the temperature threshold value, the anti-freezing condition is not met.
In an alternative embodiment, the controller is specifically configured to:
and controlling the air conditioner to be switched to a heating mode for operation.
In an alternative embodiment, the controller is further configured to:
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 cold and medium temperature.
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 medium temperature, Td is the exhaust temperature of the compressor, Tc is the refrigerant liquid inlet pipe temperature of the indoor heat exchanger, A is a first calculation coefficient associated with the cold medium, B is a second calculation coefficient associated with the refrigerant liquid inlet pipe temperature, and D is a calculation constant.
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:
acquiring the temperature of a refrigerant liquid inlet pipe and the temperature of a middle pipe of an indoor heat exchanger in the refrigeration mode of air conditioner operation;
determining whether a preset anti-freezing condition is met or not according to the minimum pipe temperature of the refrigerant liquid inlet pipe temperature and the middle pipe temperature of the indoor heat exchanger;
responding to the fact that the minimum pipe temperature meets a preset anti-freezing condition, and determining and controlling the air conditioner to be switched to a corresponding anti-freezing mode according to the minimum pipe temperature; wherein the anti-freeze mode comprises reducing the frequency of the compressor if the minimum pipe temperature satisfies the first temperature condition; if the minimum pipe temperature meets the second temperature condition, the anti-freezing mode comprises controlling the air conditioner to stop; different minimum tube temperatures correspond to different temperature conditions.
In an alternative embodiment, the controller is specifically configured to:
comparing the minimum pipe temperature with a preset temperature threshold value; the preset anti-freezing condition comprises that the minimum pipe temperature is less than a temperature threshold value;
if the minimum pipe temperature is less than the temperature threshold value, the anti-freezing condition is met; and if the minimum pipe temperature is greater than or equal to the temperature threshold value, the anti-freezing condition is not met.
In an alternative embodiment, the controller is further configured to:
and controlling the air conditioner to be switched to a heating mode for operation.
In an alternative embodiment, the controller is further configured to:
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 cold and medium temperature.
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 medium temperature, Td is the exhaust temperature of the compressor, Tc is the refrigerant liquid inlet pipe temperature of the indoor heat exchanger, A is a first calculation coefficient associated with the cold medium, B is a second calculation coefficient associated with the refrigerant liquid inlet pipe temperature, and D is a calculation constant.
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. 6 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:
acquiring the temperature of a refrigerant liquid inlet pipe and the temperature of a middle pipe of an indoor heat exchanger in the refrigeration mode of air conditioner operation;
calculating the temperature difference value of the liquid inlet pipe temperature and the middle pipe temperature of the refrigerant;
in response to the temperature difference value being smaller than or equal to the preset difference threshold value, taking the temperature mean value of the refrigerant liquid inlet pipe temperature and the middle pipe temperature as a reference temperature; in response to the temperature difference value being larger than a preset difference threshold value, taking the minimum pipe temperature of the refrigerant liquid inlet pipe temperature and the middle pipe temperature of the indoor heat exchanger as a reference temperature;
determining whether a preset anti-freezing condition is met or not according to the reference temperature;
responding to the condition that the reference temperature meets the preset anti-freezing condition, and determining and controlling the air conditioner to switch to a corresponding anti-freezing mode according to the reference temperature; wherein the anti-freeze mode comprises reducing the frequency of the compressor if the reference temperature meets the first temperature condition; if the reference temperature meets the second temperature condition, the anti-freezing mode comprises controlling the air conditioner to stop; the temperature conditions corresponding to different reference temperatures are different.
In an alternative embodiment, the controller is specifically configured to:
comparing the reference temperature with a preset temperature threshold; the preset anti-freezing condition comprises that the reference temperature is less than a temperature threshold value;
if the reference temperature is less than the temperature threshold value, the anti-freezing condition is met; and if the reference temperature is greater than or equal to the temperature threshold value, the anti-freezing condition is not met.
In an alternative embodiment, the controller is specifically configured to:
and controlling the air conditioner to be switched to a heating mode for operation.
In an alternative embodiment, the controller is further configured to:
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 cold and medium temperature.
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 medium temperature, Td is the exhaust temperature of the compressor, Tc is the refrigerant liquid inlet pipe temperature of the indoor heat exchanger, A is a first calculation coefficient associated with the cold medium, B is a second calculation coefficient associated with the refrigerant liquid inlet pipe temperature, and D is a calculation constant.
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. 7 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:
acquiring the temperature of a refrigerant liquid inlet pipe and the temperature of a middle pipe of an indoor heat exchanger in the refrigeration mode of air conditioner operation;
determining whether a preset anti-freezing condition is met or not according to the minimum pipe temperature of the refrigerant liquid inlet pipe temperature and the middle pipe temperature of the indoor heat exchanger;
responding to the fact that the minimum pipe temperature meets a preset anti-freezing condition, and determining and controlling the air conditioner to be switched to a corresponding anti-freezing mode according to the minimum pipe temperature; wherein the anti-freeze mode comprises reducing the frequency of the compressor if the minimum pipe temperature satisfies the first temperature condition; if the minimum pipe temperature meets the second temperature condition, the anti-freezing mode comprises starting an electric auxiliary heating device of the indoor unit; if the minimum pipe temperature meets the third temperature condition, the anti-freezing mode comprises controlling the air conditioner to stop; different minimum tube temperatures correspond to different temperature conditions.
In an alternative embodiment, the controller is specifically configured to:
comparing the minimum pipe temperature with a preset temperature threshold value; the preset anti-freezing condition comprises that the minimum pipe temperature is less than a temperature threshold value;
if the minimum pipe temperature is less than the temperature threshold value, the anti-freezing condition is met; and if the minimum pipe temperature is greater than or equal to the temperature threshold value, the anti-freezing condition is not met.
In an alternative embodiment, the controller is specifically configured to:
and controlling the air conditioner to be switched to a heating mode for operation.
In an alternative embodiment, the controller is further configured to:
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 cold and medium temperature.
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 medium temperature, Td is the exhaust temperature of the compressor, Tc is the refrigerant liquid inlet pipe temperature of the indoor heat exchanger, A is a first calculation coefficient associated with the cold medium, B is a second calculation coefficient associated with the refrigerant liquid inlet pipe temperature, and D is a calculation constant.
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. 8 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:
acquiring the temperature of a refrigerant liquid inlet pipe and the temperature of a middle pipe of an indoor heat exchanger in the refrigeration mode of air conditioner operation;
calculating the temperature difference value of the liquid inlet pipe temperature and the middle pipe temperature of the refrigerant;
in response to the temperature difference value being smaller than or equal to the preset difference threshold value, taking the temperature mean value of the refrigerant liquid inlet pipe temperature and the middle pipe temperature as a reference temperature; in response to the temperature difference value being larger than a preset difference threshold value, taking the minimum pipe temperature of the refrigerant liquid inlet pipe temperature and the middle pipe temperature of the indoor heat exchanger as a reference temperature;
determining whether a preset anti-freezing condition is met or not according to the reference temperature;
responding to the condition that the reference temperature meets the preset anti-freezing condition, and determining and controlling the air conditioner to switch to a corresponding anti-freezing mode according to the reference temperature; wherein the anti-freeze mode comprises reducing the frequency of the compressor if the reference temperature meets the first temperature condition; if the reference temperature meets the second temperature condition, the anti-freezing mode comprises starting an electric auxiliary heating device of the indoor unit; if the reference temperature meets the third temperature condition, the anti-freezing mode comprises controlling the air conditioner to stop; the temperature conditions corresponding to different reference temperatures are different.
In an alternative embodiment, the controller is specifically configured to:
comparing the reference temperature with a preset temperature threshold; the preset anti-freezing condition comprises that the reference temperature is less than a temperature threshold value;
if the reference temperature is less than the temperature threshold value, the anti-freezing condition is met; and if the reference temperature is greater than or equal to the temperature threshold value, the anti-freezing condition is not met.
In an alternative embodiment, the controller is specifically configured to:
and controlling the air conditioner to be switched to a heating mode for operation.
In an alternative embodiment, the controller is further configured to:
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 cold and medium temperature.
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 medium temperature, Td is the exhaust temperature of the compressor, Tc is the refrigerant liquid inlet pipe temperature of the indoor heat exchanger, A is a first calculation coefficient associated with the cold medium, B is a second calculation coefficient associated with the refrigerant liquid inlet pipe temperature, and D is a calculation constant.
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 first sensor for detecting the temperature of a liquid inlet pipe of a refrigerant, and the middle part of the indoor heat exchanger is provided with a second sensor for detecting the temperature of a middle pipe of the indoor heat exchanger; the control method comprises the following steps:
acquiring the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe of the indoor heat exchanger in the refrigeration mode of the air conditioner;
comparing the numerical values of the refrigerant liquid inlet pipe temperature and the middle pipe temperature and calculating the temperature difference value of the refrigerant liquid inlet pipe temperature and the middle pipe temperature;
responding to the temperature of the refrigerant liquid inlet pipe to be less than the temperature of the middle pipe, and taking the temperature of the refrigerant liquid inlet pipe as a reference temperature; responding to the fact that the temperature of the refrigerant liquid inlet pipe is greater than or equal to the temperature of the middle pipe and the temperature difference value is greater than or equal to a preset difference threshold value, and taking the temperature of the middle pipe as a reference temperature; in response to the fact that the temperature of the refrigerant liquid inlet pipe is greater than or equal to the temperature of the middle pipe and the temperature difference value is smaller than the preset difference threshold value, taking the temperature average value of the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe of the indoor heat exchanger as a reference temperature;
determining whether a preset anti-freezing condition is met or not according to the reference temperature;
responding to the reference temperature meeting the preset anti-freezing condition, and controlling the air conditioner to be switched to an anti-freezing mode; if the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe meet a first temperature condition, the anti-freezing mode comprises increasing the opening degree of the throttling device; if the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe meet a second temperature condition, the anti-freezing mode comprises the step of reducing the frequency of the compressor; and if the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe meet a third temperature condition, the anti-freezing mode comprises the steps of increasing the opening degree of the throttling device and increasing the rotating speed of the inner fan.
2. The control method according to claim 1, wherein the determining whether a preset freeze prevention condition is satisfied according to the reference temperature includes:
comparing the reference temperature with a preset temperature threshold; the preset anti-freezing condition comprises that the reference temperature is smaller than the temperature threshold value;
if the reference temperature is less than the temperature threshold value, the anti-freezing condition is met; and if the reference temperature is greater than or equal to the temperature threshold value, the anti-freezing condition is not met.
3. The control method according to claim 1, wherein the controlling the air conditioner to switch to the anti-freeze mode further comprises:
and controlling the air conditioner to be switched to a heating mode for operation.
4. The control method according to claim 1 or 3, characterized by further comprising:
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 inlet pipe of the indoor heat exchanger;
and carrying out load protection operation on the air conditioner according to the cold medium temperature.
5. The control method according to claim 4, 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 cold medium, B is a second calculation coefficient associated with the refrigerant inlet pipe temperature, and D is a calculation constant.
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 first sensor for detecting the temperature of a liquid inlet pipe of a refrigerant, and the middle part of the indoor heat exchanger is provided with a second sensor for detecting the temperature of a middle pipe of the indoor heat exchanger; the air conditioner further includes a controller for:
acquiring the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe of the indoor heat exchanger in the refrigeration mode of the air conditioner;
comparing the numerical values of the refrigerant liquid inlet pipe temperature and the middle pipe temperature and calculating the temperature difference value of the refrigerant liquid inlet pipe temperature and the middle pipe temperature;
responding to the temperature of the refrigerant liquid inlet pipe to be less than the temperature of the middle pipe, and taking the temperature of the refrigerant liquid inlet pipe as a reference temperature; responding to the fact that the temperature of the refrigerant liquid inlet pipe is greater than or equal to the temperature of the middle pipe and the temperature difference value is greater than or equal to a preset difference threshold value, and taking the temperature of the middle pipe as a reference temperature; in response to the fact that the temperature of the refrigerant liquid inlet pipe is greater than or equal to the temperature of the middle pipe and the temperature difference value is smaller than the preset difference threshold value, taking the temperature average value of the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe of the indoor heat exchanger as a reference temperature;
determining whether a preset anti-freezing condition is met or not according to the reference temperature;
responding to the reference temperature meeting the preset anti-freezing condition, and controlling the air conditioner to be switched to an anti-freezing mode; if the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe meet a first temperature condition, the anti-freezing mode comprises increasing the opening degree of the throttling device; if the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe meet a second temperature condition, the anti-freezing mode comprises the step of reducing the frequency of the compressor; and if the temperature of the refrigerant liquid inlet pipe and the temperature of the middle pipe meet a third temperature condition, the anti-freezing mode comprises the steps of increasing the opening degree of the throttling device and increasing the rotating speed of the inner fan.
7. The air conditioner of claim 6, wherein the controller is specifically configured to:
comparing the reference temperature with a preset temperature threshold; the preset anti-freezing condition comprises that the reference temperature is smaller than the temperature threshold value;
if the reference temperature is less than the temperature threshold value, the anti-freezing condition is met; and if the reference temperature is greater than or equal to the temperature threshold value, the anti-freezing condition is not met.
8. The air conditioner of claim 6, wherein the controller is specifically configured to:
and controlling the air conditioner to be switched to a heating mode for operation.
9. The air conditioner according to claim 6 or 8, wherein the controller is further configured to:
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 inlet pipe of the indoor heat exchanger;
and carrying out load protection operation on the air conditioner according to the cold medium temperature.
10. The air conditioner of claim 9, 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 cold medium, B is a second calculation coefficient associated with the refrigerant inlet pipe temperature, and D is a calculation constant.
CN201811352099.6A 2018-11-14 2018-11-14 Air conditioner and anti-freezing control method thereof Active CN111189173B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08261542A (en) * 1995-03-20 1996-10-11 Fujitsu General Ltd Air conditioner
JP2000018679A (en) * 1998-07-06 2000-01-18 Matsushita Electric Ind Co Ltd Controller for air conditioner
CN104596032A (en) * 2014-12-31 2015-05-06 广东美的制冷设备有限公司 Air conditioner and defrosting control method thereof
CN105222285A (en) * 2015-11-03 2016-01-06 珠海格力电器股份有限公司 A kind of control system of air-conditioning heating frosting and control method
CN106839326A (en) * 2017-02-28 2017-06-13 广东美的制冷设备有限公司 Air conditioner fault reminding method, device and air-conditioner
CN107726682A (en) * 2017-10-12 2018-02-23 青岛海尔空调电子有限公司 The anti-refrigeration control method of source pump

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08261542A (en) * 1995-03-20 1996-10-11 Fujitsu General Ltd Air conditioner
JP2000018679A (en) * 1998-07-06 2000-01-18 Matsushita Electric Ind Co Ltd Controller for air conditioner
CN104596032A (en) * 2014-12-31 2015-05-06 广东美的制冷设备有限公司 Air conditioner and defrosting control method thereof
CN105222285A (en) * 2015-11-03 2016-01-06 珠海格力电器股份有限公司 A kind of control system of air-conditioning heating frosting and control method
CN106839326A (en) * 2017-02-28 2017-06-13 广东美的制冷设备有限公司 Air conditioner fault reminding method, device and air-conditioner
CN107726682A (en) * 2017-10-12 2018-02-23 青岛海尔空调电子有限公司 The anti-refrigeration control method of source pump

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