CN115419944A - Air conditioner and operation control method thereof - Google Patents

Air conditioner and operation control method thereof Download PDF

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Publication number
CN115419944A
CN115419944A CN202211210936.8A CN202211210936A CN115419944A CN 115419944 A CN115419944 A CN 115419944A CN 202211210936 A CN202211210936 A CN 202211210936A CN 115419944 A CN115419944 A CN 115419944A
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China
Prior art keywords
air conditioner
temperature
defrosting
preset
frequency
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Pending
Application number
CN202211210936.8A
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Chinese (zh)
Inventor
张士兵
刘睿
潘京大
刘芝芸
郭宁
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Hisense Air Conditioning Co Ltd
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Hisense Air Conditioning Co Ltd
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Publication date
Application filed by Hisense Air Conditioning Co Ltd filed Critical Hisense Air Conditioning Co Ltd
Priority to CN202211210936.8A priority Critical patent/CN115419944A/en
Publication of CN115419944A publication Critical patent/CN115419944A/en
Pending legal-status Critical Current

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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
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located 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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/42—Defrosting; Preventing freezing of outdoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • 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
    • F25B41/30—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
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/04—Clogging
    • 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
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/021—Inverters therefor
    • 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)
  • Signal Processing (AREA)
  • Thermal Sciences (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses an air conditioner and an operation control method of the air conditioner, wherein the air conditioner comprises a circulating system formed by a compressor, a four-way valve, an indoor heat exchanger, an electronic expansion valve and an outdoor heat exchanger, the four-way valve is switched to conduct a reverse defrosting loop in response to a defrosting instruction, and the air conditioner enters a defrosting mode; adjusting the current operating frequency of the compressor to be a preset defrosting frequency, and adjusting the current opening of the electronic expansion valve to be a preset maximum opening; detecting the temperature of an outdoor coil in real time, if the temperature of the outdoor coil is greater than a first preset temperature, adjusting the current running frequency of the compressor to be a preset drying frequency, and reducing the current opening of the electronic expansion valve to the initial opening of a heating mode of the air conditioner; wherein the drying frequency is less than the defrosting frequency. By adopting the invention, the phenomenon of abnormal blockage of the air conditioner system in the defrosting process can be effectively prevented, and the operation reliability of the air conditioner is improved.

Description

Air conditioner and operation control method thereof
Technical Field
The invention relates to the technical field of air conditioning systems, in particular to an air conditioner and an operation control method of the air conditioner.
Background
The air conditioner becomes essential intelligent equipment in daily life of people, and can realize multiple functions such as refrigeration, heating and dehumidification. The air source heat pump system frosting problem is the key technical problem of the air conditioner, and has obvious influence on heating performance and comfort. When the outdoor environment temperature is low, the air conditioner is easy to frost, the performance is quickly attenuated, and the heating capacity is insufficient. At present, the conventional reverse circulation defrosting mode is generally adopted by the air conditioner, the cost of the air conditioner is not increased by the defrosting mode, and the defrosting mode is simplest to realize, so that the air conditioner is widely applied.
However, in the process of implementing the invention, the inventor finds that the prior art has at least the following problems: when the air conditioner enters a reverse circulation defrosting mode, lubricating oil is separated out in the process of gasifying refrigerants of an indoor unit of the air conditioner, and the evaporation temperature is gradually reduced to cause the lubricating oil to form floccules which are attached to the inner wall of a heat exchange tube, so that the lubricating oil is enriched in an indoor heat exchanger; in addition, the refrigerant continuously migrates to the compressor during defrosting, resulting in a large amount of lubricating oil being dissolved in the compressor oil sump. After defrosting is completed, the four-way valve is switched to a heating starting stage, when a refrigerant carries more lubricating oil to enter the electronic expansion valve, low temperature leads to aggregation of lubricating oil floccules in the valve and a rear pipeline, and the refrigerant in the compressor can not rapidly participate in system circulation, so that the evaporation temperature of a low-pressure side behind a throttling element is low, oil blockage is easily caused, and the air conditioner can not normally run.
Disclosure of Invention
The embodiment of the invention aims to provide an air conditioner and an operation control method of the air conditioner, which can effectively prevent the phenomenon of abnormal blockage of an air conditioner system in the defrosting process and improve the operation reliability of the air conditioner.
To achieve the above object, an embodiment of the present invention provides an air conditioner, including:
the compressor, the four-way valve, the indoor heat exchanger, the electronic expansion valve and the outdoor heat exchanger form a circulating system;
the outdoor temperature sensor is used for acquiring the temperature of an outdoor coil of the outdoor heat exchanger;
a controller to:
responding to a defrosting instruction, switching the four-way valve to conduct a reverse defrosting loop, and enabling the air conditioner to enter a defrosting mode;
adjusting the current operating frequency of the compressor to be a preset defrosting frequency, and adjusting the current opening of the electronic expansion valve to be a preset maximum opening;
detecting the temperature of the outdoor coil in real time;
if the temperature of the outdoor coil pipe is higher than a first preset temperature, adjusting the current running frequency of the compressor to be a preset drying frequency, and reducing the current opening of the electronic expansion valve to the initial opening of the heating mode of the air conditioner; wherein the drying frequency is less than the defrosting frequency.
As an improvement of the above scheme, the air conditioner further comprises an indoor fan and an indoor temperature sensor, wherein the indoor temperature sensor is used for collecting the temperature of an indoor coil of the indoor heat exchanger;
after the current operating frequency of the compressor is adjusted to be the preset defrosting frequency and the current opening degree of the electronic expansion valve is adjusted to be the preset maximum opening degree, the controller is further configured to:
detecting the temperature of the indoor coil in real time;
and if the temperature of the indoor coil pipe is less than or equal to a second preset temperature, controlling the indoor fan to start and operate.
As an improvement of the above, the controller is further configured to:
and when the defrosting of the air conditioner is finished, keeping the compressor not to stop, switching the four-way valve to conduct the heating loop, and starting the air conditioner in a heating mode.
As an improvement of the above scheme, the air conditioner further comprises an outdoor fan; when the defrosting of the air conditioner is finished, the controller is further configured to:
adjusting the current running frequency of the compressor to be a preset lowest frequency; controlling the electronic expansion valve to maintain the current opening degree unchanged; controlling the indoor fan to maintain the current running state unchanged;
and after the defrosting of the air conditioner is finished and the preset time is delayed, controlling the outdoor fan to start and operate.
As an improvement of the above solution, after the air conditioner enters the heating mode starting stage, the controller is further configured to:
if the temperature of the outdoor coil pipe is greater than or equal to a third preset temperature, adjusting the current opening of the electronic expansion valve to be the initial opening of the heating mode of the air conditioner;
and if the temperature of the outdoor coil is lower than the third preset temperature, adjusting the current opening of the electronic expansion valve to be the preset maximum opening, and continuing until the starting stage of the heating mode is finished.
The embodiment of the invention also provides an operation control method of the air conditioner, wherein the air conditioner comprises the following steps:
the compressor, the four-way valve, the indoor heat exchanger, the electronic expansion valve and the outdoor heat exchanger form a circulating system;
the outdoor temperature sensor is used for collecting the temperature of an outdoor coil of the outdoor heat exchanger;
the method comprises the following steps:
responding to a defrosting instruction, switching the four-way valve to conduct a reverse defrosting loop, and enabling the air conditioner to enter a defrosting mode;
adjusting the current operating frequency of the compressor to be a preset defrosting frequency, and adjusting the current opening of the electronic expansion valve to be a preset maximum opening;
detecting the temperature of the outdoor coil in real time;
if the temperature of the outdoor coil pipe is higher than a first preset temperature, adjusting the current running frequency of the compressor to be a preset drying frequency, and reducing the current opening of the electronic expansion valve to the initial opening of the heating mode of the air conditioner; wherein the drying frequency is less than the defrosting frequency.
As an improvement of the above scheme, the air conditioner further comprises an indoor fan and an indoor temperature sensor, wherein the indoor temperature sensor is used for collecting the temperature of an indoor coil of the indoor heat exchanger;
after the adjusting the current operating frequency of the compressor to the preset defrosting frequency and the adjusting the current opening degree of the electronic expansion valve to the preset maximum opening degree, the method further includes:
detecting the temperature of the indoor coil in real time;
and if the temperature of the indoor coil pipe is less than or equal to a second preset temperature, controlling the indoor fan to start and operate.
As an improvement of the above, the method further comprises:
and when the defrosting of the air conditioner is finished, keeping the compressor without stopping, switching the four-way valve to conduct the heating loop, and starting the air conditioner in a heating mode.
As an improvement of the above scheme, the air conditioner further comprises an outdoor fan;
when the defrosting of the air conditioner is finished, the method further includes:
adjusting the current running frequency of the compressor to be a preset lowest frequency; controlling the electronic expansion valve to maintain the current opening degree unchanged; controlling the indoor fan to maintain the current running state unchanged;
and after the defrosting of the air conditioner is finished and the preset time is delayed, controlling the outdoor fan to start and operate.
As an improvement of the above solution, after the air conditioner enters the heating mode starting stage, the method further includes:
if the temperature of the outdoor coil pipe is greater than or equal to a third preset temperature, adjusting the current opening of the electronic expansion valve to be the initial opening of the heating mode of the air conditioner;
and if the temperature of the outdoor coil pipe is lower than the third preset temperature, adjusting the current opening of the electronic expansion valve to be the preset maximum opening, and continuing until the starting stage of the heating mode is finished.
Compared with the prior art, the air conditioner and the operation control method of the air conditioner disclosed by the invention respond to the defrosting instruction, the four-way valve is switched to conduct the reverse defrosting loop, and the air conditioner enters the defrosting mode. And in the defrosting stage, adjusting the current operating frequency of the compressor to be a preset defrosting frequency, and adjusting the current opening of the electronic expansion valve to be a preset maximum opening. When the temperature of the outdoor coil pipe is detected to be higher than the first preset temperature, the dewatering and drying stage is judged to enter, the current operation frequency of the compressor is reduced to the preset drying frequency, the current opening of the electronic expansion valve is reduced to the initial opening of the heating mode of the air conditioner, the continuous migration of the refrigerant to the compressor and the migration of the lubricating oil to the indoor unit can be effectively relieved, a large amount of refrigerant is prevented from being dissolved in an oil pool of the compressor, and further the phenomenon that the refrigerant with high oil content rate passes through a throttling device in the heating starting stage after the defrosting is finished and the heating mode is switched is prevented from causing oil blockage.
Drawings
Fig. 1 is a schematic structural view of an air conditioner according to an embodiment of the present invention;
FIG. 2 is a schematic view showing a configuration of a circulation system of an air conditioner according to an embodiment of the present invention;
fig. 3 is a schematic view showing a preferred structure of a circulation system of an air conditioner in the embodiment of the present invention;
FIG. 4 is a flowchart illustrating operations performed by the controller in accordance with a first preferred embodiment of the present invention;
FIG. 5 is a flow chart illustrating operations performed by the controller in accordance with a second preferred embodiment of the present invention;
FIG. 6 is a flow chart illustrating the operation of the controller in accordance with a third preferred embodiment of the present invention;
FIG. 7 is a flowchart illustrating operations performed by the controller in accordance with a fourth preferred embodiment of the present invention;
FIG. 8 is a flowchart illustrating operations performed by the controller in a fifth preferred embodiment of the present invention
FIG. 9 is a timing diagram illustrating the timing of the various components of a prior art air conditioner;
FIG. 10 is a timing diagram illustrating the status of various components of the air conditioner according to the embodiment of the present invention;
fig. 11 is a flowchart illustrating an operation control method of an air conditioner according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention. The embodiment of the invention provides an air conditioner 10, wherein the air conditioner 10 comprises a circulating system 20, and the circulating system 20 comprises a compressor 21, a four-way valve 22, an indoor heat exchanger 23, an electronic expansion valve 24 and an outdoor heat exchanger 25 which are circularly connected.
Preferably, the air conditioner 10 further includes an indoor fan 30 and an outdoor fan 40 for performing respective blowing operations.
Specifically, referring to fig. 2, which is a schematic structural diagram of a circulation system of an air conditioner in an embodiment of the present invention, the four-way valve 22 includes A, B, C and four interfaces D, and on-off control of a heating loop and a reverse defrosting loop of the air conditioner is realized by controlling communication of different interfaces of the four-way valve.
In the first case, when the ports a and B and the ports C and D are communicated with each other, the exhaust port of the compressor 21 is connected to the inlet of the indoor heat exchanger 23 through the four-way valve 22, the outlet of the indoor heat exchanger 23 is connected to the inlet of the electronic expansion valve 24, the outlet of the electronic expansion valve 24 is connected to the inlet of the outdoor heat exchanger 25, and the outlet of the outdoor heat exchanger 25 is connected to the return port of the compressor 21 through the four-way valve 22, thereby forming a conductive heating circuit. In the heating mode of the air conditioner, the exhaust gas of the compressor 21 enters the indoor heat exchanger 23 through the four-way valve 22, the refrigerant is condensed into supercooled liquid in the indoor heat exchanger 23, the refrigerant enters the outdoor heat exchanger 25 after being throttled by the electronic expansion valve 24, and the refrigerant enters the compressor 21 for air suction after being subjected to heat exchange and evaporation into gas, so that the whole cycle is completed.
In the second case, when the ports a and D and B and C are communicated, the discharge port of the compressor 21 is connected to the inlet of the outdoor heat exchanger 25 through the four-way valve 22, the outlet of the outdoor heat exchanger 25 is connected to the inlet of the electronic expansion valve 24, the outlet of the electronic expansion valve 24 is connected to the inlet of the indoor heat exchanger 23, and the outlet of the outdoor heat exchanger 25 is connected to the return port of the compressor 21 through the four-way valve 22, thereby forming a conductive reverse defrosting circuit. In the defrosting process, the air conditioner enters a cooling mode, the high-temperature and high-pressure refrigerant output by the compressor 21 enters the outdoor heat exchanger 25 through the four-way valve 22, the refrigerant releases heat in the outdoor heat exchanger 25 to defrost the refrigerant, and the refrigerant after heat release returns to the compressor 21 after passing through the electronic expansion valve 24 and the indoor heat exchanger 23.
It should be noted that, when the four-way valve 22 is in the power-on state, the port a is communicated with the port B, and the port C is communicated with the port D; when the four-way valve 22 is in the power-off state, the ports a and D are communicated, and the ports B and C are communicated, and the specific structure and principle of the four-way valve 22 may refer to the prior art, which is not described herein.
Referring to fig. 3, which is a schematic diagram of a preferred structure of a circulation system of an air conditioner according to an embodiment of the present invention, the circulation system 20 further includes a first filter 26 and a second filter 27 respectively disposed between the indoor heat exchanger 23 and the electronic expansion valve 24, and between the outdoor heat exchanger 25 and the electronic expansion valve 24.
Further, referring to fig. 1 and 2, the air conditioner 10 further includes an indoor temperature sensor 50 and an outdoor temperature sensor 60, wherein the indoor temperature sensor 50 is disposed on a coil surface of the indoor heat exchanger 23, and is used for collecting an indoor coil temperature T of the indoor heat exchanger 23 in An outdoor temperature sensor 60 is arranged on the coil surface of the outdoor heat exchanger 25 for collecting the outdoor coil temperature T of the outdoor heat exchanger 25 out 。
Referring to fig. 1, the air conditioner 10 further includes a controller 70, and the controller 70 is respectively connected to each component in the circulation system 20, and further connected to the indoor fan 30, the indoor temperature sensor 50, and the outdoor temperature sensor 60, so as to obtain and analyze information and issue related control commands.
Specifically, referring to fig. 4, which is a schematic flowchart of the operation executed by the controller in the embodiment of the present invention in the first preferred embodiment, the controller 70 is configured to execute steps S11 to S14:
s11, responding to a defrosting instruction, switching the four-way valve to conduct a reverse defrosting loop, and enabling the air conditioner to enter a defrosting mode;
s12, adjusting the current running frequency of the compressor to be a preset defrosting frequency, and adjusting the current opening of the electronic expansion valve to be a preset maximum opening;
s13, detecting the temperature of the outdoor coil in real time;
s14, if the temperature of the outdoor coil pipe is higher than a first preset temperature, adjusting the current running frequency of the compressor to be a preset drying frequency, and reducing the current opening of the electronic expansion valve to the initial opening of the heating mode of the air conditioner; wherein the drying frequency is less than the defrosting frequency.
The embodiment of the invention is applied to the operation process of the heating mode of the air conditioner, when the outdoor environment temperature is lower than a certain temperature, such as 5 ℃, the air conditioner frosts, and the defrosting function of the air conditioner is started. The controller 70 responds to the defrosting command and controls the four-way valve 22 to be in a power-off state, so that the port A is communicated with the port D, the port B is communicated with the port C, the reverse defrosting loop is conducted, and the air conditioner enters a defrosting mode.
The embodiment of the invention divides the defrosting process into a defrosting stage and a drying stage. When the air conditioner enters the defrosting mode, firstly, in the defrosting stage, the controller 70 controls the compressor 21 to adjust the current operating frequency F to the preset defrosting frequency F d And adjusting the current opening degree U of the electronic expansion valve 24 to a preset maximum opening degree U max That is, the electronic expansion valve is fully opened, and the throttling and pressure reducing functions are closed, so that the refrigerant is kept in an original state when passing through the electronic expansion valve 24, and is not throttled and reduced in pressure, and therefore, when passing through the indoor heat exchanger 23, the refrigerant does not absorb indoor heat from the indoor heat exchanger 23, and the influence on the indoor temperature is reduced.
It should be noted that the defrosting frequency F d And the maximum opening degree U max The specific value may be set according to the actual application, and is not limited specifically herein.
It should be noted that, when it is determined that the air conditioner satisfies the defrosting condition, the indoor fan 30, the outdoor fan 40 and the compressor 21 are all in the shutdown state, and when the four-way valve is switched, and after the air conditioner enters the defrosting mode, the compressor 21 is restarted to operate in the defrosting stage, and the indoor fan 30 and the outdoor fan 40 are kept in the shutdown state to wait for a subsequent control instruction.
Further, the controller 70 obtains the outdoor coil temperature T collected by the outdoor temperature sensor 60 in real time out According to the outdoor coil temperature T out To judge whether the air conditioner has finished defrosting, and enter the drying stage, and realize the adjustment of the operation parameters of the compressor 21 and the electronic expansion valve 24 in the drying stage.
Specifically, a first preset temperature T is preset out_set The method is used for representing the temperature of the outdoor coil when the frost layer of the outdoor unit melts. According to the collected outdoor coil temperature T out If T is satisfied out ＞T out_set When the frost layer is effectively melted, the outdoor heat exchanger enters a dewatering and drying stage, and at this time, the current operating frequency of the compressor 21 is gradually reduced to a preset drying frequency F h And, an electronic expansion valve 24, the current opening degree is reduced to the initial opening degree U of the heating mode on When defrosting enters a drying stage, the running frequency of the compressor and the opening degree of the electronic expansion valve are reduced, so that the refrigerant can be effectively prevented from migrating to the compressor, lubricating oil can be effectively prevented from migrating to the indoor unit, and a large amount of refrigerant is prevented from being dissolved in an oil pool of the compressor.
Optionally, the first preset temperature T out_set The value range of (a) can be set to 1-3 ℃, and the value can be set according to the actual situation, and is not specifically limited herein.
It should be noted that the drying frequency F h Is preset and satisfies F h ＜F d Frequency of drying F h The specific value of (a) may be set according to the actual application, and is not particularly limited herein.
The embodiment of the invention provides an air conditioner, which responds to a defrosting instruction, switches a four-way valve to conduct a reverse defrosting loop, and enters a defrosting mode. And in the defrosting stage, adjusting the current operating frequency of the compressor to be a preset defrosting frequency, and adjusting the current opening of the electronic expansion valve to be a preset maximum opening. When the temperature of the outdoor coil pipe is detected to be higher than the first preset temperature, the dewatering and drying stage is judged to enter, the current operation frequency of the compressor is reduced to the preset drying frequency, the current opening of the electronic expansion valve is reduced to the initial opening of the heating mode of the air conditioner, the continuous migration of the refrigerant to the compressor and the migration of the lubricating oil to the indoor unit can be effectively relieved, a large amount of refrigerant is prevented from being dissolved in an oil pool of the compressor, and further the phenomenon that the refrigerant with high oil content rate passes through a throttling device in the heating starting stage after the defrosting is finished and the heating mode is switched is prevented from causing oil blockage.
As a preferred implementation, refer to fig. 5, which is a flowchart illustrating operations performed by the controller in the second preferred implementation according to an embodiment of the present invention.
After the current operating frequency of the compressor is adjusted to be the preset defrosting frequency and the current opening degree of the electronic expansion valve is adjusted to be the preset maximum opening degree, the controller is further configured to execute steps S15 and S16:
s15, detecting the temperature of the indoor coil in real time;
and S16, if the temperature of the indoor coil pipe is less than or equal to a second preset temperature, controlling the indoor fan to start and operate.
After the air conditioner enters a defrosting mode, the current operating frequency of the compressor is adjusted to be the preset defrosting frequency, and the current opening degree of the electronic expansion valve is adjusted to be the preset maximum opening degree, the controller 70 also obtains the indoor coil temperature T acquired by the indoor temperature sensor 50 in real time in According to the indoor coil temperature T in And controlling the opening state of the indoor fan.
Specifically, the second preset temperature T is preset in_set And is used for representing whether the current indoor coil temperature is in a low temperature state or not. According to the collected indoor coil temperature T in If T is satisfied in ≤T in_set And controls the indoor fan 30 to start operation. Preferably, the control room is used for controlling the starting operation of the indoor fan, and specifically comprises the following steps: and controlling the indoor fan to start a breeze mode.
Understandably, if the air conditioner is in the defrosting mode, the temperature of the indoor coil pipe always meets T in ＞T in_set The indoor fan 30 maintains the stopped operation state.
It should be noted that the second preset temperature T in_set The setting may be performed according to actual conditions, and is not particularly limited herein.
By adopting the technical means of the embodiment of the invention, when the indoor coil temperature is detected to be lower, the indoor fan is controlled to start and operate, the accumulation of lubricating oil in the indoor heat exchanger caused by the further reduction of the indoor coil temperature can be effectively relieved, the oil blockage phenomenon is prevented and relieved, and the oil blockage phenomenon is more effectively prevented by matching with the follow-up judgment of whether to enter the drying stage according to the outdoor coil temperature and the control of the compressor and the electronic expansion valve in the drying stage.
As a preferred implementation, refer to fig. 6, which is a flowchart illustrating the operation performed by the controller in the embodiment of the present invention in the third preferred implementation. The embodiment of the present invention is further implemented on the basis of the above embodiment, and after steps S11 to S16, the controller 70 is further configured to execute step S21:
and S21, when the defrosting of the air conditioner is finished, keeping the compressor not to stop, switching the four-way valve to conduct the heating loop, and enabling the air conditioner to enter a heating mode starting stage.
In the embodiment of the invention, after the air conditioner enters the defrosting mode, whether the air conditioner meets the defrosting ending condition is judged in real time, when the air conditioner finishes defrosting, the four-way valve 22 is directly switched, the four-way valve 22 is controlled to be in the power-on state, the port A is communicated with the port B, the port C is communicated with the port D, the heating loop is conducted, the air conditioner enters the starting stage of the heating mode, and the compressor 21 is kept in the non-stop state in the process.
By adopting the technical means of the embodiment of the invention, the compressor is not stopped after defrosting is finished, and the four-way valve is directly reversed, compared with the mode that the compressor is controlled to stop after the air conditioner is defrosted and then the four-way valve is reversed in the prior art, the residual high-temperature and high-pressure refrigerant in the outdoor heat exchanger can be effectively introduced into the compressor for air suction, the boiling separation of the refrigerant in the liquid mixture in the oil pool of the compressor is accelerated, the air suction quantity of the compressor is increased, the refrigerant is promoted to rapidly participate in the system circulation, and the temperature condition for the oil blockage caused by the over-low temperature of the low-pressure side is prevented.
In an optional embodiment, the set temperature T of the outdoor coil when the defrosting end condition is met is preset out_set ' real-time detection of current outdoor coil temperature T out Whether or not T is satisfied out ≥T out_set ' if yes, indicating that the defrosting end condition is met. Of course, other methods in the prior art can be adopted to judge whether defrosting is finished, and the beneficial effects obtained by the invention are not influenced.
As a preferred embodiment, referring to fig. 7, it is a flowchart illustrating the operation performed by the controller in the fourth preferred embodiment according to the embodiment of the present invention, when the defrosting of the air conditioner is finished, the controller is further configured to perform steps S22 and S23:
s22, adjusting the current running frequency of the compressor to be a preset lowest frequency; controlling the electronic expansion valve to maintain the current opening degree unchanged; and controlling the indoor fan to maintain the current running state unchanged.
And S23, after the defrosting of the air conditioner is finished and the preset time is delayed, controlling the outdoor fan to start to operate.
In the embodiment of the present invention, after the defrosting of the air conditioner is finished, the air conditioner switches back to the heating mode, and during the switching process, the controller 70 keeps the compressor not stopped, but presets the current operating frequency adjustment value of the compressor to the lowest frequency F min And the electronic expansion valve 24 and the indoor fan 30 are kept unchanged. And the outdoor fan 40 is started after delaying the preset time t.
The lowest frequency F of the compressor min The value of the preset value may be set according to the actual application of the compressor, and is not limited in detail. Understandably, F min ＜F h ＜F d 。
Optionally, the preset time period t is set to 10s, and of course, the preset time period t may also be set to other values according to actual situations, which is not specifically limited herein.
By adopting the technical means of the embodiment of the invention, after the defrosting of the air conditioner is finished, the compressor is controlled not to stop, the operation frequency is adjusted to the lowest frequency, the stable switching of the four-way valve can be ensured, the residual high-temperature and high-pressure refrigerant in the outdoor heat exchanger can be introduced into the compressor for air suction, the boiling separation of the refrigerant in the liquid mixture in the oil pool of the compressor is accelerated, the refrigerant is promoted to rapidly participate in the system circulation, and the oil blockage phenomenon caused by the over-low temperature of the low-pressure side is prevented. And, indoor fan and outdoor fan all are in the starting condition, guarantee the normal switching of mode of heating.
As a preferred embodiment, refer to fig. 8, which is a schematic flowchart of operations performed by the controller in the embodiment of the present invention in a fifth preferred embodiment. On the basis of the above embodiment, after the air conditioner enters the heating mode starting stage, the controller is further configured to execute steps S31 and S32:
s31, if the temperature of the outdoor coil is greater than or equal to a third preset temperature, adjusting the current opening of the electronic expansion valve to be the initial opening of the heating mode of the air conditioner;
and S32, if the temperature of the outdoor coil is lower than the third preset temperature, adjusting the current opening degree of the electronic expansion valve to be the preset maximum opening degree, and continuing until the starting stage of the heating mode is finished.
In the embodiment of the present invention, after the air conditioner is switched back to the heating mode, the air conditioner is in the heating mode starting stage, and the compressor 21 is adjusted to the preset starting frequency F of the heating mode on And the current opening degree of the electronic expansion valve 24 is the preset initial opening degree U on 。
Presetting a third preset temperature T out_on The method is used for representing the lower limit set temperature of the outdoor coil at the starting stage of the heating mode of the air conditioner. Real-time outdoor coil temperature T out And a preset third preset temperature T out_on When T is the magnitude relation of out ≥T out_on The current opening degree of the electronic expansion valve 24 is always kept at the initial opening degree U on When T is out ＜T out_on Then, the current opening degree of the electronic expansion valve 24 is adjusted to the initial maximum opening degree U max And the maximum opening degree operation is kept in the whole heating mode starting stage.
Optionally, the first and second preset temperatures T out_on The value range of (A) can be set to-30-35 ℃, and the value can be set according to the actual situation, and is not particularly limited herein.
Preferably, step S32 is specifically: if the outdoor coil temperature is less than the third preset temperature and lasts for a certain time period t on And adjusting the current opening degree of the electronic expansion valve to be the preset maximum opening degree, and continuing until the starting stage of the heating mode is finished.
Referring to fig. 9 and 10, fig. 9 is a state timing diagram of each component of an air conditioner in the prior art, and fig. 10 is a state timing diagram of each component of an air conditioner in the embodiment of the present invention, compared with a defrosting control strategy in the prior art, the embodiment of the present invention divides a defrosting process into a defrosting stage and a drying stage, and in the defrosting process, when the temperature of the indoor coil is detected to be less than or equal to a second preset temperature, the indoor fan is controlled to start operation, so that the phenomenon that lubricating oil is accumulated in the indoor heat exchanger due to further reduction of the temperature of the indoor coil can be effectively alleviated, and the occurrence of an oil blockage phenomenon can be prevented and alleviated. When the temperature of the outdoor coil pipe is detected to be higher than a first preset temperature, the dewatering and drying stage is judged to enter, the current operation frequency of the compressor is reduced to the preset drying frequency, the current opening degree of the electronic expansion valve is reduced to the initial opening degree of the heating mode of the air conditioner, the continuous migration of the refrigerant to the compressor and the migration of the lubricating oil to the indoor unit can be effectively relieved, a large amount of refrigerant is prevented from being dissolved in an oil pool of the compressor, the phenomenon that the refrigerant with high oil content rate passes through a throttling device in the heating starting stage after defrosting is finished and the heating mode is switched is prevented, in addition, the switching mode of switching into the heating mode is finished by the defrosting, the high-temperature and high-pressure refrigerant remained in the outdoor heat exchanger can be effectively introduced into the compressor to suck air, the refrigerant in the liquid mixture in the oil pool of the compressor is accelerated to be boiled and separated out, the air suction amount of the compressor is increased, the refrigerant is enabled to rapidly participate in the system circulation, and the temperature condition that the low-pressure side is too low to provide the oil blocking is prevented. The embodiment of the invention solves the problem of abnormal blockage of the throttling element in the prior defrosting process and the heating initial stage, and effectively enhances the stability and the reliability of the operation of the air conditioner system.
Fig. 11 is a schematic flow chart illustrating an operation control method of an air conditioner according to an embodiment of the present invention. The embodiment of the invention provides an operation control method of an air conditioner, wherein the air conditioner comprises the following steps:
the compressor, the four-way valve, the indoor heat exchanger, the electronic expansion valve and the outdoor heat exchanger form a circulating system;
the outdoor temperature sensor is used for collecting the temperature of an outdoor coil of the outdoor heat exchanger;
the method comprises the following steps:
responding to a defrosting instruction, switching the four-way valve to conduct a reverse defrosting loop, and enabling the air conditioner to enter a defrosting mode;
adjusting the current operating frequency of the compressor to be a preset defrosting frequency, and adjusting the current opening of the electronic expansion valve to be a preset maximum opening;
detecting the temperature of the outdoor coil in real time;
if the temperature of the outdoor coil pipe is higher than a first preset temperature, adjusting the current running frequency of the compressor to be a preset drying frequency, and reducing the current opening of the electronic expansion valve to the initial opening of the heating mode of the air conditioner; wherein the drying frequency is less than the defrosting frequency.
As a preferred embodiment, the air conditioner further comprises an indoor fan and an indoor temperature sensor, wherein the indoor temperature sensor is used for acquiring the temperature of an indoor coil of the indoor heat exchanger;
after the adjusting the current operating frequency of the compressor to the preset defrosting frequency and the adjusting the current opening degree of the electronic expansion valve to the preset maximum opening degree, the method further includes:
detecting the temperature of the indoor coil in real time;
and if the temperature of the indoor coil pipe is less than or equal to a second preset temperature, controlling the indoor fan to start and operate.
As a preferred embodiment, the method further comprises:
and when the defrosting of the air conditioner is finished, keeping the compressor not to stop, switching the four-way valve to conduct the heating loop, and starting the air conditioner in a heating mode.
As a preferred embodiment, the air conditioner further comprises an outdoor fan;
when the defrosting of the air conditioner is finished, the method further includes:
adjusting the current running frequency of the compressor to be a preset lowest frequency; controlling the electronic expansion valve to maintain the current opening degree unchanged; controlling the indoor fan to maintain the current running state unchanged;
and after the defrosting of the air conditioner is finished and the preset time is delayed, controlling the outdoor fan to start and operate.
As a preferred embodiment, after the air conditioner enters a heating mode starting stage, the method further includes:
if the temperature of the outdoor coil pipe is greater than or equal to a third preset temperature, adjusting the current opening of the electronic expansion valve to be the initial opening of the heating mode of the air conditioner;
and if the temperature of the outdoor coil pipe is lower than the third preset temperature, adjusting the current opening of the electronic expansion valve to be the preset maximum opening, and continuing until the starting stage of the heating mode is finished.
By adopting the technical means of the embodiment of the invention, the accumulation of lubricating oil in the indoor heat exchanger caused by the further reduction of the temperature of the indoor coil can be effectively relieved, the oil blockage phenomenon can be prevented and relieved, the continuous migration of the refrigerant to the compressor and the migration of the lubricating oil to the indoor unit can be effectively relieved, the large amount of refrigerant is prevented from being dissolved in an oil pool of the compressor, and the oil blockage phenomenon caused by the refrigerant with high oil content rate in the heating starting stage passing through the throttling device after the heating mode is switched after defrosting is finished is prevented.
It should be noted that, the operation control method of the air conditioner provided in the embodiment of the present invention is the same as all the process steps executed by the controller of the air conditioner in the above embodiment, and the working principles and beneficial effects of the two are in one-to-one correspondence, so that the detailed description is omitted.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-only memory (ROM), a Random Access Memory (RAM), or the like.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (10)

1. An air conditioner, comprising:
the compressor, the four-way valve, the indoor heat exchanger, the electronic expansion valve and the outdoor heat exchanger form a circulating system;
the outdoor temperature sensor is used for collecting the temperature of an outdoor coil of the outdoor heat exchanger;
a controller to:
responding to a defrosting instruction, switching the four-way valve to conduct a reverse defrosting loop, and enabling the air conditioner to enter a defrosting mode;
adjusting the current operating frequency of the compressor to be a preset defrosting frequency, and adjusting the current opening of the electronic expansion valve to be a preset maximum opening;
detecting the temperature of the outdoor coil in real time;
if the temperature of the outdoor coil pipe is higher than a first preset temperature, adjusting the current running frequency of the compressor to be a preset drying frequency, and reducing the current opening of the electronic expansion valve to the initial opening of the heating mode of the air conditioner; wherein the drying frequency is less than the defrosting frequency.
2. The air conditioner of claim 1, further comprising an indoor fan and an indoor temperature sensor for collecting an indoor coil temperature of the indoor heat exchanger;
after the current operating frequency of the compressor is adjusted to the preset defrosting frequency and the current opening degree of the electronic expansion valve is adjusted to the preset maximum opening degree, the controller is further configured to:
detecting the temperature of the indoor coil in real time;
and if the temperature of the indoor coil pipe is less than or equal to a second preset temperature, controlling the indoor fan to start and operate.
3. The air conditioner of claim 2, wherein the controller is further configured to:
and when the defrosting of the air conditioner is finished, keeping the compressor not to stop, switching the four-way valve to conduct the heating loop, and starting the air conditioner in a heating mode.
4. The air conditioner according to claim 3, further comprising an outdoor fan; when the defrosting of the air conditioner is finished, the controller is further configured to:
adjusting the current running frequency of the compressor to be a preset lowest frequency; controlling the electronic expansion valve to maintain the current opening degree unchanged; controlling the indoor fan to maintain the current running state unchanged;
and after the defrosting of the air conditioner is finished and the preset time is delayed, controlling the outdoor fan to start and operate.
5. The air conditioner according to any one of claims 2 to 4, wherein after the air conditioner enters a heating mode starting stage, the controller is further configured to:
if the temperature of the outdoor coil pipe is greater than or equal to a third preset temperature, adjusting the current opening of the electronic expansion valve to be the initial opening of the heating mode of the air conditioner;
and if the temperature of the outdoor coil pipe is lower than the third preset temperature, adjusting the current opening of the electronic expansion valve to be the preset maximum opening, and continuing until the starting stage of the heating mode is finished.
6. An operation control method of an air conditioner, characterized in that the air conditioner comprises:
the compressor, the four-way valve, the indoor heat exchanger, the electronic expansion valve and the outdoor heat exchanger form a circulating system;
the outdoor temperature sensor is used for collecting the temperature of an outdoor coil of the outdoor heat exchanger;
the method comprises the following steps:
responding to a defrosting instruction, switching the four-way valve to conduct a reverse defrosting loop, and enabling the air conditioner to enter a defrosting mode;
adjusting the current operating frequency of the compressor to be a preset defrosting frequency, and adjusting the current opening of the electronic expansion valve to be a preset maximum opening;
detecting the temperature of the outdoor coil in real time;
if the temperature of the outdoor coil pipe is higher than a first preset temperature, adjusting the current running frequency of the compressor to be a preset drying frequency, and reducing the current opening of the electronic expansion valve to the initial opening of the heating mode of the air conditioner; wherein the drying frequency is less than the defrosting frequency.
7. The operation control method of an air conditioner according to claim 6, wherein the air conditioner further comprises an indoor fan and an indoor temperature sensor for collecting an indoor coil temperature of the indoor heat exchanger;
after the adjusting the current operating frequency of the compressor to the preset defrosting frequency and the adjusting the current opening degree of the electronic expansion valve to the preset maximum opening degree, the method further includes:
detecting the temperature of the indoor coil in real time;
and if the temperature of the indoor coil pipe is less than or equal to a second preset temperature, controlling the indoor fan to start and operate.
8. The operation control method of an air conditioner according to claim 7, characterized in that the method further comprises:
and when the defrosting of the air conditioner is finished, keeping the compressor not to stop, switching the four-way valve to conduct the heating loop, and starting the air conditioner in a heating mode.
9. The operation control method of an air conditioner according to claim 8, wherein the air conditioner further comprises an outdoor fan;
when the defrosting of the air conditioner is finished, the method further includes:
adjusting the current running frequency of the compressor to be a preset lowest frequency; controlling the electronic expansion valve to maintain the current opening degree unchanged; controlling the indoor fan to maintain the current running state unchanged;
and after the defrosting of the air conditioner is finished and the preset time is delayed, controlling the outdoor fan to start and operate.
10. The operation control method of an air conditioner according to any one of claims 7 to 9, wherein after the air conditioner enters a heating mode starting stage, the method further comprises:
if the temperature of the outdoor coil pipe is greater than or equal to a third preset temperature, adjusting the current opening of the electronic expansion valve to be the initial opening of the heating mode of the air conditioner;
and if the temperature of the outdoor coil pipe is lower than the third preset temperature, adjusting the current opening of the electronic expansion valve to be the preset maximum opening, and continuing until the starting stage of the heating mode is finished.
CN202211210936.8A 2022-09-30 2022-09-30 Air conditioner and operation control method thereof Pending CN115419944A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211210936.8A CN115419944A (en) 2022-09-30 2022-09-30 Air conditioner and operation control method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211210936.8A CN115419944A (en) 2022-09-30 2022-09-30 Air conditioner and operation control method thereof

Publications (1)

Publication Number Publication Date
CN115419944A true CN115419944A (en) 2022-12-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211210936.8A Pending CN115419944A (en) 2022-09-30 2022-09-30 Air conditioner and operation control method thereof

Country Status (1)

Country Link
CN (1) CN115419944A (en)

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