CN117553392A - Method and device for controlling defrosting of air conditioner outdoor unit, air conditioner and storage medium - Google Patents

Method and device for controlling defrosting of air conditioner outdoor unit, air conditioner and storage medium Download PDF

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Publication number
CN117553392A
CN117553392A CN202210928907.9A CN202210928907A CN117553392A CN 117553392 A CN117553392 A CN 117553392A CN 202210928907 A CN202210928907 A CN 202210928907A CN 117553392 A CN117553392 A CN 117553392A
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CN
China
Prior art keywords
defrosting
heat exchanger
air conditioner
expansion valve
electronic expansion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210928907.9A
Other languages
Chinese (zh)
Inventor
沈英焱
罗建文
张心沛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
Original Assignee
Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qingdao Haier Air Conditioner Gen Corp Ltd, Qingdao Haier Air Conditioning Electric Co Ltd, Haier Smart Home Co Ltd filed Critical Qingdao Haier Air Conditioner Gen Corp Ltd
Priority to CN202210928907.9A priority Critical patent/CN117553392A/en
Publication of CN117553392A publication Critical patent/CN117553392A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/42—Defrosting; Preventing freezing of outdoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • 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
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/40—Fluid line arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • F25B47/022—Defrosting cycles hot gas defrosting
    • F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/002—Defroster control
    • F25D21/004—Control mechanisms
    • 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
    • F24F2140/10—Pressure
    • F24F2140/12—Heat-exchange fluid pressure
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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

Abstract

The application relates to the technical field of intelligent home, and discloses a method for controlling defrosting of an air conditioner outdoor unit, wherein a defrosting branch is arranged between an outlet end of an outdoor heat exchanger of an air conditioner and a four-way valve; the outdoor heat exchanger comprises a first outdoor heat exchanger and a second outdoor heat exchanger which are connected in series, and a second electronic expansion valve is arranged on a series pipeline; the method comprises the following steps: responding to an outdoor defrosting command of the air conditioner; the first electronic expansion valve between the outdoor heat exchanger and the indoor heat exchanger is controlled to be closed, and the defrosting branch is controlled to be conducted; and determining a control strategy of the second electronic expansion valve according to the discharge pressure of the compressor or the temperature of the coil pipe of the outdoor unit, and controlling the execution. The method ensures that the refrigerant does not flow through the indoor heat exchanger during defrosting, reduces energy consumption and is beneficial to improving defrosting efficiency. Meanwhile, the defrosting effect is ensured by controlling the opening degree of the second electronic expansion valve. The application also discloses a device for controlling the defrosting of the air conditioner outdoor unit, an air conditioner and a storage medium.

Description

Method and device for controlling defrosting of air conditioner outdoor unit, air conditioner and storage medium
Technical Field
The present disclosure relates to the technical field of intelligent home appliances, and for example, to a method and an apparatus for controlling defrosting of an outdoor unit of an air conditioner, and a storage medium.
Background
When the air conditioner operates in a heating mode, the outdoor unit of the air conditioner is prone to frosting. In general, an operation mode of an air conditioner is switched to a cooling mode, and an outdoor unit is defrosted. But during defrosting, the indoor heat exchanger absorbs heat, so that the indoor environment temperature fluctuates greatly. Especially in colder environments, fluctuations in indoor temperature can affect the heating comfort of the user.
The related art discloses an air conditioning system, which comprises an indoor unit and an outdoor unit, wherein the indoor unit comprises a Paul outdoor heat exchanger, a first outdoor heat exchanger, a second outdoor heat exchanger, a compressor, a four-way electromagnetic valve, a first three-way electromagnetic valve, a second three-way electromagnetic valve, an electromagnetic stop valve, a first three-way valve, a second three-way valve, a third three-way valve, a fourth three-way valve, a first throttling element and a second throttling element which are communicated through pipelines. When defrosting, the control of the four-way electromagnetic valve, the first three-way electromagnetic valve and the second three-way electromagnetic valve enables the second outdoor heat exchanger to replace the indoor heat exchanger when the first outdoor heat exchanger is defrosted. The first outdoor heat exchanger replaces the indoor heat exchanger while the second outdoor heat exchanger is defrosted.
In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:
in the related art, two outdoor heat exchangers alternately become an evaporator and a condenser at the time of defrosting to achieve defrosting. Thus, the defrosting time is prolonged, and the heating experience of indoor users is reduced.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows.
The embodiment of the disclosure provides a method and a device for controlling defrosting of an air conditioner outdoor unit, an air conditioner and a storage medium, so that defrosting efficiency is improved and indoor temperature comfort is not affected.
In some embodiments, the air conditioner includes a refrigerant circulation loop; a defrosting branch is arranged between the outlet end of the outdoor heat exchanger of the air conditioner and the four-way valve; the outdoor heat exchanger comprises a first outdoor heat exchanger and a second outdoor heat exchanger which are connected in series, and a second electronic expansion valve is arranged on a series pipeline; the method comprises the following steps: responding to an outdoor defrosting command of the air conditioner; the first electronic expansion valve between the outdoor heat exchanger and the indoor heat exchanger is controlled to be closed, and the defrosting branch is controlled to be conducted; and determining a control strategy of the air conditioner according to the discharge pressure of the compressor or the temperature of the coil pipe of the outdoor unit, and controlling the execution.
In some embodiments, the apparatus comprises: a processor and a memory storing program instructions, the processor being configured to perform the method for controlling defrosting of an air conditioner outdoor unit as described above when the program instructions are executed.
In some embodiments, the air conditioner includes: the refrigerant circulation loop comprises a compressor, a four-way valve, an outdoor heat exchanger, a first electronic expansion valve and an indoor heat exchanger which are sequentially connected; the defrosting branch is arranged between the outlet end of the outdoor heat exchanger and the four-way valve and is connected in parallel with a refrigerant circulation loop among the outlet end of the outdoor heat exchanger, the first electronic expansion valve, the indoor heat exchanger and the four-way valve; the outdoor heat exchanger comprises a first outdoor heat exchanger and a second outdoor heat exchanger which are connected in series, and a second electronic expansion valve is arranged on a pipeline between the first outdoor heat exchanger and the second outdoor heat exchanger; and, the device for controlling the defrosting of the air conditioner outdoor unit as described above.
In some embodiments, the storage medium stores program instructions that, when executed, perform a method for controlling defrosting of an air conditioner outdoor unit as described above.
The method, the device, the air conditioner and the storage medium for controlling the defrosting of the air conditioner outdoor unit provided by the embodiment of the disclosure can realize the following technical effects:
in the embodiment of the disclosure, the outdoor heat exchanger comprises two heat exchangers connected in series, a first electronic expansion valve in a refrigerant circulation loop is closed during defrosting, and a defrosting branch is conducted. Therefore, on one hand, the low-temperature refrigerant after defrosting and heat exchange is prevented from flowing into the indoor heat exchanger, and the indoor environment temperature is prevented from being influenced. On the other hand, the refrigerant for defrosting the outdoor heat exchanger flows into the compressor through the defrosting branch. The energy consumption is reduced, and the defrosting efficiency is improved. And in the defrosting process, the second electronic expansion valve between the two outdoor heat exchangers is controlled based on the exhaust pressure of the compressor or the temperature of the coil pipe of the outdoor unit so as to ensure the defrosting effect.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which like reference numerals refer to similar elements, and in which:
fig. 1 is a schematic structural view of an air conditioner according to an embodiment of the present disclosure;
fig. 2 is a schematic view of a method for controlling defrosting of an outdoor unit of an air conditioner according to an embodiment of the present disclosure;
fig. 3 is a schematic view of another method for controlling defrosting of an outdoor unit of an air conditioner according to an embodiment of the present disclosure;
fig. 4 is a schematic view of another method for controlling defrosting of an outdoor unit of an air conditioner according to an embodiment of the present disclosure;
fig. 5 is a schematic view of another method for controlling defrosting of an outdoor unit of an air conditioner according to an embodiment of the present disclosure;
fig. 6 is a schematic view of an apparatus for controlling defrosting of an outdoor unit of an air conditioner according to an embodiment of the present disclosure.
Reference numerals:
10: a compressor; 20: a four-way valve; 30: an outdoor heat exchanger; 31: a first outdoor heat exchanger; 32: a second outdoor heat exchanger; 40: an indoor heat exchanger; 51: a first electronic expansion valve; 52: a second electronic expansion valve; 60: a defrost branch; 61: an on-off valve; 70: a gas-liquid separator.
Detailed Description
So that the manner in which the features and techniques of the disclosed embodiments can be understood in more detail, a more particular description of the embodiments of the disclosure, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the disclosure. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.
The terms first, second and the like in the description and in the claims of the embodiments of the disclosure and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the present disclosure. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.
The term "plurality" means two or more, unless otherwise indicated.
In the embodiment of the present disclosure, the character "/" indicates that the front and rear objects are an or relationship. For example, A/B represents: a or B.
The term "and/or" is an associative relationship that describes an object, meaning that there may be three relationships. For example, a and/or B, represent: a or B, or, A and B.
The term "corresponding" may refer to an association or binding relationship, and the correspondence between a and B refers to an association or binding relationship between a and B.
Referring to fig. 1, the air conditioner includes a refrigerant circulation circuit including a compressor 10, a four-way valve 20, an outdoor heat exchanger 30, a first electronic expansion valve 51, and an indoor heat exchanger 40, which are sequentially connected through pipes. A defrost branch 60 is provided between the outlet end of the outdoor heat exchanger 30 and the four-way valve 20. The outlet end of the outdoor heat exchanger 30 is the outlet end of the outdoor heat exchanger 30 in terms of the refrigerant flowing direction when the air conditioner is operated in the cooling mode. When the air conditioner performs outdoor defrosting (i.e., when the air conditioner operates in a cooling mode), the first electronic expansion valve 51 is closed and the defrosting branch 60 is turned on. The high-temperature refrigerant discharged from the compressor 10 flows into the outdoor heat exchanger 30 through the four-way valve 20, and flows back to the compressor through the defrosting branch 60 and the four-way valve 20 after the outdoor heat exchanger 30 exchanges heat and is defrosted. After the first electronic expansion valve 51 is closed, the refrigerant flowing out of the outdoor heat exchanger 30 does not flow through the indoor heat exchanger 40 any more. Thus, after the air conditioner is switched from the heating mode to the defrosting mode, the low-temperature refrigerant does not flow through the indoor unit. On one hand, the temperature comfort of indoor users is not affected, on the other hand, the energy consumption of the system during defrosting is reduced, and the defrosting efficiency is improved. In addition, noise generated by refrigerant flow of the indoor unit during defrosting is eliminated.
Further, the outdoor heat exchanger 30 includes a first outdoor heat exchanger 31 and a second outdoor heat exchanger 32 connected in series, and a second electronic expansion valve 52 is provided on the series line. During defrosting, the opening degree of the second electronic expansion valve 52 may be adjusted to control defrosting. The related art is that the discharge pressure and the return air pressure of the compressor 10 are rapidly increased as the frost layer is slowly removed during defrosting, particularly at the late stage of defrosting. If the discharge pressure or the return pressure reaches a safety protection value, the compressor 10 executes protection control logic to end the defrost. This can result in incomplete defrosting and incomplete removal of the frost layer. In addition, if the compressor 10 is not protected in time, damage to the air conditioning unit may also be caused. Therefore, here, the second electronic expansion valve 52 and the two outdoor heat exchangers are provided, and the control of the compressor return air pressure and the exhaust air pressure in the middle and late stages of defrosting is achieved by adjusting the opening degree of the second electronic expansion valve 52. The excessive pressure of the compressor is avoided to carry out the protection interruption defrosting, and the defrosting effect is further ensured. In some embodiments, the air conditioner further includes a gas-liquid separator 70. When the air conditioner performs outdoor defrosting, high-temperature refrigerant discharged by the compressor 10 flows into the outdoor heat exchanger 30 through the four-way valve 20, and flows back to the compressor after the outdoor heat exchanger 30 exchanges heat and is defrosted, through the defrosting branch 60, the four-way valve 20 and the gas-liquid separator 70.
Optionally, the defrosting branch 60 is provided with an on-off valve 61. The on-off valve 61 may be a solenoid valve, an electronic expansion valve, or the like. During normal operation of the air conditioner, the on-off valve 61 is in a closed state to block the defrost branch. At the time of defrosting of the air conditioner, the on-off valve 61 is in an open state, while the first electronic expansion valve 51 is cooperatively closed. The defrosting branch 60 is conducted, and the refrigerant flows through the defrosting branch 60 during defrosting and does not flow into the indoor unit.
In some embodiments, when the air conditioner is operating normally, the opening degree of the on-off valve 61 may be controlled according to the operating state of the air conditioner and the heating requirement. Specifically, in the air conditioning operation heating mode, if the operation parameter of the compressor 10 is relatively low and the heating demand is also relatively low, the on-off valve 61 may be controlled to open by a certain opening degree. In this way, the pressure and temperature of the refrigerant flowing into the outdoor heat exchanger 30 can be increased, so that the frosting speed of the outdoor heat exchanger 30 can be reduced, and the outdoor heat exchanger 30 can be prevented from frosting even under some working conditions. When the heating demand is relatively high, the defrosting branch 60 is conducted to affect indoor heating, so that the user demand is difficult to meet. When the running frequency, the exhaust temperature and other parameters of the air conditioner compressor are higher, the temperature of the outdoor heat exchanger is higher. This can cause the refrigerant flowing back to the compressor to be at a higher temperature (i.e., the return air temperature is at a higher temperature), which is detrimental to the operation of the compressor.
Referring to fig. 2, an embodiment of the present disclosure provides a method for controlling defrosting of an outdoor unit of an air conditioner, including:
s101, the processor responds to an outdoor defrost instruction of the air conditioner.
S102, the processor controls the first electronic expansion valve between the outdoor heat exchanger and the indoor heat exchanger to be closed, and controls the defrosting branch to be conducted.
S103, the processor determines a control strategy of the second electronic expansion valve according to the discharge pressure of the compressor or the temperature of the coil pipe of the outdoor unit, and controls execution.
Here, defrosting is performed for the air conditioner in the heating mode. I.e., in the heating mode, in response to an outdoor defrost command of the air conditioner. That is, it is necessary to control the four-way valve to reverse so that the air conditioner operates in the cooling mode. Meanwhile, a first electronic expansion valve between the outdoor heat exchanger and the indoor heat exchanger is controlled to be closed, namely, the refrigerant is prevented from flowing into the indoor unit. The defrosting branch is conducted, so that the high-temperature and high-pressure refrigerant exchanges heat in the outdoor heat exchanger, and the frost layer of the outdoor heat exchanger is melted. The low-temperature low-pressure refrigerant after heat exchange flows back to the compressor through the defrosting branch.
Further, during defrosting, the second electronic expansion valve is regulated according to the discharge pressure of the compressor or the temperature of the coil pipe of the outdoor unit. It will be appreciated that more heat source is required to defrost both outdoor heat exchangers during the initial stages of defrosting. At this time, the opening degree of the second electronic expansion valve may be large. As the defrosting process continues, the heat sources required for defrosting the two outdoor heat exchangers gradually shrink. At this time, if the opening degree of the second electronic expansion valve is still large, the outdoor heat exchanger temperature may be caused to reach the set temperature prematurely. And thus the defrosting of the outdoor heat exchanger is not thorough. Or the opening degree of the second electronic expansion valve is larger, so that the pressure of the compressor is increased, and the air conditioner enters over-protection to interrupt defrosting. This also makes defrosting of the outdoor heat exchanger incomplete. Therefore, it is necessary to reduce the opening degree of the second electronic expansion valve to limit the pressure of the compressor or to reduce the outdoor unit coil temperature.
In addition, the refrigerant flows through the first outdoor heat exchanger and then flows through the second outdoor heat exchanger, so that the defrosting effect of the first outdoor heat exchanger is good in the defrosting process, and the second outdoor heat exchanger is not thoroughly defrosted or frozen. When there are two outdoor heat exchangers, the two outdoor heat exchangers are usually disposed up and down. When defrosting, the water defrosted by the upper outdoor heat exchanger flows to the lower outdoor heat exchanger. When the outside ambient temperature is low, the underlying outdoor heat exchanger is prone to ice formation. In this case, the opening degree of the second electronic expansion valve needs to be reduced so that the second outdoor heat exchanger can be fully defrosted, and defrosting effect is ensured.
By adopting the method for controlling the defrosting of the air conditioner outdoor unit, the outdoor heat exchanger comprises two heat exchangers connected in series, the first electronic expansion valve in the refrigerant circulation loop is closed during defrosting, and the defrosting branch is conducted. Therefore, on one hand, the low-temperature refrigerant after defrosting and heat exchange is prevented from flowing into the indoor heat exchanger, and the indoor environment temperature is prevented from being influenced. On the other hand, the refrigerant for defrosting the outdoor heat exchanger flows into the compressor through the defrosting branch. The energy consumption is reduced, and the defrosting efficiency is improved. And in the defrosting process, the second electronic expansion valve between the two outdoor heat exchangers is controlled based on the exhaust pressure of the compressor or the temperature of the coil pipe of the outdoor unit so as to ensure the defrosting effect.
Optionally, in step S103, the processor determines a control strategy of the second electronic expansion valve according to a discharge pressure of the compressor or an outdoor unit coil temperature, including:
and under the condition that the discharge pressure of the compressor is smaller than the first discharge pressure, or the temperature of the coil pipe of the outdoor unit is smaller than the first coil pipe temperature, or the temperature of the coil pipe of the outdoor unit is larger than or equal to the first coil pipe temperature and the duration is smaller than the first duration, the processor determines that the second electronic expansion valve is at the maximum opening degree.
The processor determines to decrease the opening of the second electronic expansion valve in the case where the discharge pressure of the compressor is greater than or equal to the first discharge pressure, or the outdoor unit coil temperature is greater than or equal to the first coil temperature for a duration greater than or equal to the first duration.
Here, the control strategy of the second electronic expansion valve is determined based on the discharge pressure of the compressor, or the outdoor unit coil temperature and the duration of the temperature. Specifically, when the discharge pressure of the compressor is small, or the temperature of the outdoor unit coil is low, or the outdoor unit coil reaches the set first coil temperature but the temperature duration is short, the control strategy of the second electronic expansion valve is controlled at the maximum opening degree. Wherein, the discharge pressure of the compressor and the temperature of the outdoor unit coil are inversely proportional to the frosting area. I.e., the smaller the frosting area, the greater the discharge pressure of the compressor or the higher the outdoor unit coil temperature. Thus, the defrosting condition is judged by the discharge pressure of the compressor and the temperature of the coil pipe of the outdoor unit. When the discharge pressure of the compressor is high, or the outdoor coil temperature is high and the duration is less than the first duration, it indicates that the outdoor heat exchanger has preliminarily completed defrosting (i.e., completed the first stage of defrosting). In order to further ensure thorough defrosting, the opening of the second electronic expansion valve needs to be reduced so as to carry out defrosting regulation and control in the second stage. Namely, the flow of the high-temperature refrigerant is controlled, and the over-protection of the air conditioning system is prevented from being triggered, so that the defrosting effect is improved.
In addition, the first exhaust pressure, the first coil temperature, and the first time period are all set values, which may be set based on the type of air conditioner, or may be determined through a plurality of experiments.
Optionally, in step S103, the processor determines to reduce the opening of the second electronic expansion valve, including:
the higher the discharge pressure of the compressor or the higher the temperature of the outdoor unit coil, the smaller the opening degree of the second electronic expansion valve.
Here, the opening degree of the second electronic expansion valve is determined by the discharge pressure of the compressor or the outdoor unit coil temperature. The opening of the second electronic expansion valve is inversely related to the two parameters. Specifically, the discharge pressure of the compressor will be described as an example. The difference between the discharge temperature of the compressor and the first discharge pressure may be obtained, and the larger the value of the difference is, the smaller the opening degree of the second electronic expansion valve is. Or, the change rate of the exhaust temperature of the compressor is obtained, and the faster the change rate is, the smaller the opening degree of the second electronic expansion valve is.
As shown in fig. 3, another method for controlling defrosting of an outdoor unit of an air conditioner according to an embodiment of the present disclosure includes:
s101, the processor responds to an outdoor defrost instruction of the air conditioner.
S102, the processor controls the first electronic expansion valve between the outdoor heat exchanger and the indoor heat exchanger to be closed, and controls the defrosting branch to be conducted.
And S131, when the discharge pressure of the compressor is smaller than the first discharge pressure, or the temperature of the coil pipe of the outdoor unit is smaller than the first coil pipe temperature, or the temperature of the coil pipe of the outdoor unit is larger than or equal to the first coil pipe temperature and the duration is smaller than the first duration, the processor determines that the second electronic expansion valve is at the maximum opening degree, and controls execution.
And S132, in the case that the discharge pressure of the compressor is greater than or equal to the first discharge pressure, or the temperature of the coil pipe of the outdoor unit is greater than or equal to the first coil pipe temperature and the duration time is greater than or equal to the first duration time, the processor determines to reduce the opening degree of the second electronic expansion valve, and controls execution.
S204, the processor acquires defrosting time after the second electronic expansion valve is reduced, the exhaust pressure of the compressor and the temperature of the coil pipe of the outdoor unit.
And S205, controlling the air conditioner to stop defrosting by the processor under the condition that the defrosting duration reaches the second duration, or the exhaust pressure reaches the second exhaust pressure, or the temperature of the coil pipe of the outdoor unit reaches the second coil pipe temperature.
Here, after the opening degree of the second electronic expansion valve is adjusted, the second stage defrosting is entered. The defrost process is time constrained and is also constrained by the discharge pressure of the compressor, the temperature of the outdoor unit coil. The time constraint is to ensure the defrosting effect on one hand and the normal operation time of the air conditioner on the other hand. Namely, the time ratio of defrosting time to the running time of the whole air conditioner is controlled, and the influence of overlong defrosting time on the running of the whole air conditioner is avoided. However, the duration of the first defrost phase is not controllable, so that the control of the entire defrost duration can be achieved by controlling the duration of the second defrost phase.
Further, in the second defrost stage, the defrost period, the compressor discharge pressure, the outdoor unit coil temperature are monitored. And in the case that any one of the three parameters meets the constraint condition, controlling the air conditioner to finish defrosting.
Optionally, in step S205, the processor controls the air conditioner to stop defrosting, including:
the processor controls the defrosting branch to be closed, and controls the first electronic expansion valve to be opened; and controlling the air conditioner to restore to the operation mode before defrosting.
Here, controlling the air conditioner to stop defrosting includes controlling the defrosting branch to be closed and opening the indoor unit refrigerant loop. And meanwhile, the four-way valve is controlled to change the direction so as to restore the air conditioner to the operation mode before defrosting. In addition, the opening degree of the second electronic expansion valve can be adjusted according to the operation parameters of the air conditioner.
As shown in fig. 4, another method for controlling defrosting of an outdoor unit of an air conditioner according to an embodiment of the present disclosure includes:
s101, the processor responds to an outdoor defrost instruction of the air conditioner.
S102, the processor controls the first electronic expansion valve between the outdoor heat exchanger and the indoor heat exchanger to be closed, and controls the defrosting branch to be conducted.
S304, the processor adjusts the operation frequency of the compressor according to the operation parameters of the air conditioner; wherein the operating parameters of the air conditioner include one or more of an exhaust parameter and a return air parameter of the compressor.
S103, the processor determines a control strategy of the second electronic expansion valve according to the discharge pressure of the compressor or the temperature of the coil pipe of the outdoor unit, and controls execution.
Here, during defrosting of the air conditioner, it is necessary to adjust the operating frequency of the compressor. The operation frequency of the compressor is dynamically adjusted so that the air conditioner can defrost normally. Specifically, the operating frequency of the compressor is adjusted based on the discharge and return parameters of the compressor. Wherein the exhaust parameters include exhaust pressure and exhaust temperature; the return air parameters include return air pressure and return air temperature. In particular, in the second stage of defrosting, the exhaust pressure and the return air pressure of the compressor are ensured by adjusting the operating frequency of the compressor. As one example, the compression ratio of the discharge pressure to the return pressure is calculated by adjusting the operating frequency of the compressor so that the compression ratio is in a reasonable range. In addition, the control strategy of the second electronic expansion valve can be matched to regulate the compression ratio. For example, the opening degree of the second electronic expansion valve is reduced, and the return air pressure is further reduced. Thereby performing low-voltage protection.
Referring to fig. 5, another method for controlling defrosting of an outdoor unit of an air conditioner according to an embodiment of the present disclosure includes:
s101, the processor responds to an outdoor defrost instruction of the air conditioner.
S404, the processor controls the indoor unit of the air conditioner to stop running and reduces the running frequency of the compressor to a preset frequency.
S102, the processor controls the first electronic expansion valve between the outdoor heat exchanger and the indoor heat exchanger to be closed, and controls the defrosting branch to be conducted.
S103, the processor determines a control strategy of the second electronic expansion valve according to the discharge pressure of the compressor or the temperature of the coil pipe of the outdoor unit, and controls execution.
Here, when the air conditioner is defrosted, not only the refrigerant no longer flows through the indoor unit, but also the indoor unit is stopped. The indoor unit stop refers to the stop of an indoor fan. At the same time, the frequency of the compressor is reduced. Because the indoor unit is stopped and the refrigerant does not flow through the indoor unit, the required energy consumption is reduced. The frequency of the compressor is reduced during defrosting, which can satisfy the defrosting demand and contribute to the reduction of energy consumption. In addition, the outdoor unit fan is also stopped during defrosting. This is because, in the late defrosting stage, the outdoor fan operation accelerates the convection heat exchange of the outdoor heat exchanger, resulting in a large pressure fluctuation of the compressor. Further, the service life and reliability of the air conditioner are affected, and thus, the outdoor fan is also stopped during the defrosting process.
The embodiment of the disclosure provides a device for controlling defrosting of an air conditioner outdoor unit, which comprises a response module, a first control module and a second control module. The response module is configured to respond to an outdoor defrost command of the air conditioner. The first control module is configured to control the first electronic expansion valve between the outdoor heat exchanger and the indoor heat exchanger to be closed and control the defrosting branch to be conducted. The second control module is configured to determine a control strategy for the second electronic expansion valve based on a discharge pressure of the compressor or an outdoor coil temperature and control execution.
By adopting the device for controlling the defrosting of the air conditioner outdoor unit, the outdoor heat exchanger comprises two heat exchangers connected in series, the first electronic expansion valve in the refrigerant circulation loop is closed during defrosting, and the defrosting branch is conducted. Therefore, on one hand, the low-temperature refrigerant after defrosting and heat exchange is prevented from flowing into the indoor heat exchanger, and the indoor environment temperature is prevented from being influenced. On the other hand, the refrigerant for defrosting the outdoor heat exchanger flows into the compressor through the defrosting branch. The energy consumption is reduced, and the defrosting efficiency is improved. And in the defrosting process, the second electronic expansion valve between the two outdoor heat exchangers is controlled based on the exhaust pressure of the compressor or the temperature of the coil pipe of the outdoor unit so as to ensure the defrosting effect.
Referring to fig. 6, an embodiment of the present disclosure provides an apparatus for controlling defrosting of an outdoor unit of an air conditioner, including a processor (processor) 100 and a memory (memory) 101. Optionally, the apparatus may further comprise a communication interface (Communication Interface) 102 and a bus 103. The processor 100, the communication interface 102, and the memory 101 may communicate with each other via the bus 103. The communication interface 102 may be used for information transfer. The processor 100 may call logic instructions in the memory 101 to perform the method for controlling defrosting of the outdoor unit of the air conditioner of the above-described embodiment.
Further, the logic instructions in the memory 101 described above may be implemented in the form of software functional units and may be stored in a computer readable storage medium when sold or used as a stand alone product.
The memory 101 is a computer readable storage medium that can be used to store a software program, a computer executable program, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 100 executes functional applications and data processing by executing program instructions/modules stored in the memory 101, i.e., implements the method for controlling defrosting of the outdoor unit of the air conditioner in the above-described embodiment.
The memory 101 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for a function; the storage data area may store data created according to the use of the terminal device, etc. Further, the memory 101 may include a high-speed random access memory, and may also include a nonvolatile memory.
The embodiment of the disclosure provides an air conditioner, which comprises the device for controlling the defrosting of an air conditioner outdoor unit.
Embodiments of the present disclosure provide a storage medium storing computer-executable instructions configured to perform the above-described method for controlling defrosting of an air conditioner outdoor unit.
The storage medium may be a transitory computer readable storage medium or a non-transitory computer readable storage medium.
Embodiments of the present disclosure may be embodied in a software product stored on a storage medium, including one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of a method according to embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium including: a plurality of media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or a transitory storage medium.
The above description and the drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them. Other embodiments may involve structural, logical, electrical, process, and other changes. The embodiments represent only 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. Moreover, the terminology used in the present application is for the purpose of describing embodiments only and is not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a," "an," and "the" (the) are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, when used in this application, the terms "comprises," "comprising," and/or "includes," and variations thereof, mean that the stated features, integers, steps, operations, elements, and/or components are present, but that the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof is not precluded. Without further limitation, an element defined by the phrase "comprising one …" does not exclude the presence of other like elements in a process, method or apparatus comprising such elements. In this context, each embodiment may be described with emphasis on the differences from the other embodiments, and the same similar parts between the various embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method sections disclosed in the embodiments, the description of the method sections may be referred to for relevance.
Those of skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. The skilled artisan may use different methods for each particular application to achieve the described functionality, but such implementation should not be considered to be beyond the scope of the embodiments of the present disclosure. It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In the embodiments disclosed herein, the disclosed methods, articles of manufacture (including but not limited to devices, apparatuses, etc.) may be practiced in other ways. For example, the apparatus embodiments described above are merely illustrative, and for example, the division of the units may be merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form. The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to implement the present embodiment. In addition, each functional unit in the embodiments of the present disclosure may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than that disclosed in the description, and sometimes no specific order exists between different operations or steps. For example, two consecutive operations or steps may actually be performed substantially in parallel, they may sometimes be performed in reverse order, which may be dependent on the functions involved. Each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Claims (10)

1. A method for controlling defrosting of an air conditioner outdoor unit, which is characterized in that a defrosting branch is arranged between an outlet end of an outdoor heat exchanger of the air conditioner and a four-way valve; the outdoor heat exchanger comprises a first outdoor heat exchanger and a second outdoor heat exchanger which are connected in series, and a second electronic expansion valve is arranged on a series pipeline; the method comprises the following steps:
responding to an outdoor defrosting command of the air conditioner;
the first electronic expansion valve between the outdoor heat exchanger and the indoor heat exchanger is controlled to be closed, and the defrosting branch is controlled to be conducted;
and determining a control strategy of the second electronic expansion valve according to the discharge pressure of the compressor or the temperature of the coil pipe of the outdoor unit, and controlling the execution.
2. The method of claim 1, wherein determining a control strategy for the second electronic expansion valve based on a discharge pressure of the compressor or an outdoor coil temperature comprises:
determining that the second electronic expansion valve is at the maximum opening degree under the condition that the discharge pressure of the compressor is smaller than the first discharge pressure, or the temperature of the coil pipe of the outdoor unit is smaller than the first coil pipe, or the temperature of the coil pipe of the outdoor unit is larger than or equal to the first coil pipe temperature and the duration is smaller than the first duration;
and determining to reduce the opening of the second electronic expansion valve under the condition that the discharge pressure of the compressor is greater than or equal to the first discharge pressure, or the outdoor unit coil temperature is greater than or equal to the first coil temperature and the duration is greater than or equal to the first duration.
3. The method of claim 2, wherein the determining to decrease the opening of the second electronic expansion valve comprises:
the higher the discharge pressure of the compressor or the higher the temperature of the outdoor unit coil, the smaller the opening degree of the second electronic expansion valve.
4. The method of claim 2, wherein the determining to decrease the opening of the second electronic expansion valve, and after the controlling, further comprises:
acquiring defrosting time after the second electronic expansion valve is reduced, exhaust pressure of the compressor and temperature of the coil pipe of the outdoor unit;
when the defrosting time reaches a second time, or the exhaust pressure reaches a second exhaust pressure, or the temperature of the coil pipe of the outdoor unit reaches a second coil pipe temperature, controlling the air conditioner to stop defrosting;
wherein the second exhaust pressure is greater than the first exhaust pressure, the second coil temperature is greater than the first coil temperature, and the second duration is less than the first duration.
5. The method of claim 4, wherein the controlling the air conditioner to stop defrosting comprises:
controlling the defrosting branch to be closed, and controlling the first electronic expansion valve to be opened; and is combined with the other components of the water treatment device,
and controlling the air conditioner to restore to the operation mode before defrosting.
6. The method of any one of claims 1 to 5, wherein after the controlling defrost branch is turned on, further comprising:
according to the operation parameters of the air conditioner, the operation frequency of the compressor is adjusted;
the operation parameters of the air conditioner comprise the exhaust parameters and the return parameters of the compressor.
7. The method of any one of claims 1 to 5, further comprising, after the responding to the outdoor defrost command of the air conditioner:
the indoor unit of the air conditioner is controlled to stop running, and,
the operating frequency of the compressor is reduced to a preset frequency.
8. An apparatus for controlling defrosting of an air conditioner outdoor unit comprising a processor and a memory storing program instructions, wherein the processor is configured to perform the method for controlling defrosting of an air conditioner outdoor unit according to any one of claims 1 to 7 when the program instructions are executed.
9. An air conditioner, comprising:
the refrigerant circulation loop comprises a compressor, a four-way valve, an outdoor heat exchanger, a first electronic expansion valve and an indoor heat exchanger which are sequentially connected;
the defrosting branch is arranged between the outlet end of the outdoor heat exchanger and the four-way valve and is connected in parallel with a refrigerant circulation loop among the outlet end of the outdoor heat exchanger, the first electronic expansion valve, the indoor heat exchanger and the four-way valve; the outdoor heat exchanger comprises a first outdoor heat exchanger and a second outdoor heat exchanger which are connected in series, and a second electronic expansion valve is arranged on a pipeline between the first outdoor heat exchanger and the second outdoor heat exchanger; and, the apparatus for controlling defrosting of an air conditioner outdoor unit as claimed in claim 8.
10. A storage medium storing program instructions which, when executed, perform the method for controlling defrosting of an air conditioner outdoor unit according to any one of claims 1 to 7.
CN202210928907.9A 2022-08-03 2022-08-03 Method and device for controlling defrosting of air conditioner outdoor unit, air conditioner and storage medium Pending CN117553392A (en)

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CN202210928907.9A CN117553392A (en) 2022-08-03 2022-08-03 Method and device for controlling defrosting of air conditioner outdoor unit, air conditioner and storage medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210928907.9A CN117553392A (en) 2022-08-03 2022-08-03 Method and device for controlling defrosting of air conditioner outdoor unit, air conditioner and storage medium

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CN117553392A true CN117553392A (en) 2024-02-13

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