CN114688630B - Air conditioner, control method and device thereof and readable storage medium - Google Patents

Air conditioner, control method and device thereof and readable storage medium Download PDF

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Publication number
CN114688630B
CN114688630B CN202011621728.8A CN202011621728A CN114688630B CN 114688630 B CN114688630 B CN 114688630B CN 202011621728 A CN202011621728 A CN 202011621728A CN 114688630 B CN114688630 B CN 114688630B
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China
Prior art keywords
temperature
heat exchanger
outdoor
air conditioner
indoor
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Chinese (zh)
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CN114688630A (en
Inventor
黄云
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GD Midea Air Conditioning Equipment Co Ltd
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GD Midea Air Conditioning Equipment Co Ltd
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Priority to CN202011621728.8A priority Critical patent/CN114688630B/en
Publication of CN114688630A publication Critical patent/CN114688630A/en
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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
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
    • F24F1/0063—Indoor units, e.g. fan coil units characterised by heat exchangers by the mounting or arrangement of the heat exchangers
    • 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
    • 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/02—Ducting 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
    • 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
    • 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
    • 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
    • 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)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Signal Processing (AREA)
  • Fluid Mechanics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses a control method of an air conditioner, which comprises the following steps: controlling the defrosting operation of the air conditioner in response to a defrosting instruction; opening the fresh air inlet and controlling the indoor fan to be started; when the indoor fan is started, outdoor air enters the air duct from the fresh air inlet to exchange heat with the indoor heat exchanger. The invention also discloses a control device of the air conditioner, the air conditioner and a computer readable storage medium. The invention aims to improve the defrosting effect of an outdoor unit.

Description

Air conditioner, control method and device thereof and readable storage medium
Technical Field
The present invention relates to the field of air conditioning technologies, and in particular, to a control method of an air conditioner, a control device of the air conditioner, an air conditioner, and a computer readable storage medium.
Background
With the development of economic technology, air conditioners are increasingly widely used, and most air conditioners have a heating function in addition to a refrigerating function. When the air conditioner operates in a low-temperature environment, the outdoor unit is often required to be defrosted to ensure the normal heating of the air conditioner.
However, at present, the air conditioner generally performs defrosting through refrigeration, and an indoor fan is generally required to stop running in the defrosting process, however, the heat exchange of an indoor evaporator is stopped, so that the return air temperature of the system is too low, the heat exchange output capacity of the system is reduced, and the defrosting effect of an outdoor unit is affected.
Disclosure of Invention
The invention mainly aims to provide a control method of an air conditioner, which aims to improve the defrosting effect of an outdoor unit.
In order to achieve the above object, the present invention provides a control method of an air conditioner, the air conditioner includes a housing, an indoor heat exchanger and an indoor fan, the housing is provided with a fresh air inlet, an air duct is provided in the housing, the fresh air inlet is communicated with the air duct, the indoor heat exchanger and the indoor fan are both provided in the air duct, the control method of the air conditioner includes the following steps:
controlling the defrosting operation of the air conditioner in response to a defrosting instruction;
opening the fresh air inlet and controlling the indoor fan to be started;
When the indoor fan is started, outdoor air enters the air duct from the fresh air inlet to exchange heat with the indoor heat exchanger.
Optionally, before the step of opening the fresh air inlet and controlling the opening of the indoor fan, the method further includes:
acquiring an outdoor environment temperature and the indoor heat exchanger temperature in the defrosting operation process of the air conditioner;
Determining a temperature difference value between the outdoor environment temperature and the indoor heat exchanger temperature;
and if the temperature of the indoor heat exchanger is smaller than the outdoor environment temperature and the temperature difference value is larger than or equal to a set value, executing the step of opening the fresh air inlet and controlling the opening of the indoor fan.
Optionally, the step of controlling the indoor fan to be turned on includes:
determining a target rotating speed of the indoor fan according to the temperature difference value;
and controlling the indoor fan to run according to the target rotating speed.
Optionally, the step of determining the target rotation speed of the indoor fan according to the temperature difference value includes:
Acquiring a temperature characteristic parameter of the outdoor heat exchanger;
Acquiring the corresponding relation between the temperature difference and the rotating speed according to the temperature characteristic parameters of the outdoor heat exchanger;
And determining the target rotating speed of the indoor fan corresponding to the temperature difference value based on the corresponding relation between the temperature difference and the rotating speed.
Optionally, after the step of controlling the indoor fan to be turned on, the method further includes:
acquiring a temperature change parameter of the outdoor heat exchanger; the temperature change parameter is a characteristic parameter of temperature change in the defrosting operation process of the air conditioner;
Determining the operation parameters of the outdoor fan according to the temperature change parameters;
and controlling the operation of the outdoor fan according to the operation parameters.
Optionally, the step of acquiring the temperature variation parameter of the outdoor heat exchanger of the air conditioner includes:
Acquiring a first temperature and a second temperature of the outdoor heat exchanger; the first temperature is the temperature detected when the air conditioner starts the defrosting in a refrigerating state, and the second temperature is the temperature detected currently;
And determining a temperature difference between the second temperature and the first temperature as the temperature change parameter.
Optionally, the step of determining the operation parameter of the outdoor fan according to the temperature variation parameter includes:
if the temperature difference is smaller than a set threshold value, determining that the operation parameter is closing of the outdoor fan;
And if the temperature difference is greater than or equal to a set threshold, determining the operation parameter as starting the outdoor fan.
Optionally, the turning on the outdoor fan includes controlling the outdoor fan to set a turning operation;
The outdoor heat exchanger comprises an inner side and an outer side, the distance between the outer side of the outdoor heat exchanger and an outdoor air outlet of the air conditioner is smaller than that between the inner side of the outdoor heat exchanger and the outdoor air outlet of the air conditioner, and the air flow direction of the outdoor fan blows from the inner side to the outer side when the outdoor fan turns to operate according to the set direction.
Optionally, the step of controlling the defrosting operation of the air conditioner includes:
and controlling the electronic expansion valve of the air conditioner to operate at an opening greater than a set opening threshold.
Optionally, after the step of controlling the electronic expansion valve of the air conditioner to operate at an opening greater than a set opening threshold, the method further includes:
Setting time length at intervals, and acquiring the temperature of an outdoor heat exchanger of the air conditioner;
and controlling the electronic expansion valve to reduce the opening according to the temperature of the outdoor heat exchanger.
Optionally, the casing is further provided with an indoor air outlet, and before the step of controlling the indoor fan to be turned on, the method further includes:
And closing the indoor air outlet.
Optionally, the casing is further provided with a drain port communicated with the outside, the drain port is used for draining condensed water generated in the casing out of the room, and before the step of controlling the indoor fan to be started, the method further comprises the following steps:
Closing the indoor air outlet and opening the water outlet;
And when the indoor fan is started, the fresh air subjected to heat exchange is discharged outdoors from the water outlet.
In addition, in order to achieve the above object, the present application also provides a control device of an air conditioner, including: the control method comprises the steps of a memory, a processor and a control program of an air conditioner, wherein the control program of the air conditioner is stored in the memory and can run on the processor, and the control program of the air conditioner is executed by the processor to realize the control method of the air conditioner.
In addition, in order to achieve the above object, the present application also proposes an air conditioner including:
The device comprises a shell, a fan and a fan, wherein the shell is provided with a fresh air inlet, an air channel is arranged in the shell, and the fresh air inlet is communicated with the air channel;
The indoor heat exchanger is arranged in the air duct;
the indoor fan is arranged in the air duct; and
In the control device of the air conditioner, the indoor fan is connected with the control device.
In addition, in order to achieve the above object, the present application also proposes a computer-readable storage medium having stored thereon a control program of an air conditioner, which when executed by a processor, implements the steps of the control method of an air conditioner as set forth in any one of the above.
The invention provides a control method of an air conditioner, which comprises a shell, an indoor heat exchanger and an indoor fan, wherein the shell is provided with a fresh air inlet communicated with an air duct in the shell, the indoor heat exchanger and the indoor fan are both arranged in the air duct, based on the fresh air inlet, the indoor fan is controlled to be started by starting the fresh air in the defrosting process of the air conditioner in response to defrosting instructions, fresh air is introduced into the air conditioner to exchange heat with the indoor heat exchanger, based on the fresh air, the heat exchange of the indoor evaporator in the defrosting process can be guaranteed not to stop, but the heat exchange state is maintained through fresh air drainage, so that the air return temperature of the system is effectively prevented from being too low, the heat exchange output capacity of the system in the defrosting process is improved, and the defrosting effect of the outdoor unit is effectively improved.
Drawings
FIG. 1 is a schematic view showing an indoor side structure of an air conditioner according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a hardware configuration involved in the operation of an embodiment of a control device for an air conditioner;
FIG. 3 is a flow chart illustrating an embodiment of a control method of an air conditioner according to the present invention;
FIG. 4 is a flow chart of another embodiment of a control method of an air conditioner according to the present invention;
Fig. 5 is a flowchart illustrating a control method of an air conditioner according to another embodiment of the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The main solutions of the embodiments of the present invention are: the air conditioner comprises a shell, an indoor heat exchanger and an indoor fan, wherein the shell is provided with a fresh air inlet, an air duct is arranged in the shell, the fresh air inlet is communicated with the air duct, the indoor heat exchanger and the indoor fan are arranged in the air duct, and the control method of the air conditioner comprises the following steps: controlling the defrosting operation of the air conditioner in response to a defrosting instruction; opening the fresh air inlet and controlling the indoor fan to be started; when the indoor fan is started, outdoor air enters the air duct from the fresh air inlet to exchange heat with the indoor heat exchanger.
In the prior art, the air conditioner generally performs defrosting through refrigeration, and an indoor fan is generally required to stop running in the defrosting process, however, the heat exchange of an indoor evaporator is stopped, so that the return air temperature of the system is too low, the heat exchange output capacity of the system is reduced, and the defrosting effect of an outdoor unit is affected. .
The invention provides the solution scheme and aims to improve the defrosting effect of the outdoor unit.
The embodiment of the invention provides an air conditioner which can be an air conditioner comprising a host machine and a movable sub-machine, and can also be a common floor type air conditioner, a wall-mounted air conditioner and the like.
In this embodiment, referring to fig. 1, the air conditioner includes a housing 10, a refrigerant circulation system including a connected indoor heat exchanger 2, an outdoor heat exchanger, a compressor 3, a four-way valve 4, and an electronic expansion valve 5, and an indoor fan 1. The four-way valve 4 can be used for switching heating operation and cooling operation of the air conditioner. The electronic expansion valve 5 is a throttle device provided between the indoor heat exchanger 2 and the outdoor heat exchanger and having an adjustable opening.
The shell 10 is provided with a fresh air inlet 11, an indoor air return 12, an indoor air outlet 13 and a fresh air outlet 14, an air channel is arranged in the shell 10, and the fresh air inlet 11, the indoor air return 12, the indoor air outlet 13 and the fresh air outlet 14 are all communicated with the air channel. Wherein, indoor return air inlet 12 and indoor air outlet 13 all communicate with indoor environment, and new trend entry 11 and new trend export 14 all communicate with outdoor environment. In the present embodiment, the housing 10 herein specifically refers to the casing of the indoor unit.
Wherein, indoor heat exchanger 2 and indoor fan 1 are all located in the wind channel. The indoor air return port 12 and the fresh air inlet 11 are arranged on the same side of the indoor heat exchanger 2, and air entering the shell 10 through the indoor air return port 12 and the fresh air inlet 11 can exchange heat through the indoor heat exchanger 2. The fresh air inlet 14 and the fresh air outlet 11 are respectively arranged at two sides of the indoor heat exchanger 2.
The fresh air inlet 11 or a fresh air duct in which the fresh air inlet 11 is communicated with the outdoor environment can be provided with a fresh air regulating component, the fresh air regulating component specifically comprises a fresh air control valve and/or a fresh air fan, the fresh air inlet 11 can be opened when the fresh air control valve is opened, and air in the outdoor environment can enter the shell 10 from the fresh air inlet 11; when the fresh air control valve is closed, the fresh air inlet 11 can be closed, and air in the outdoor environment cannot enter the shell 10 from the fresh air inlet 11. When the fresh air inlet 11 is opened, the fresh air fan can initially suck air in the outdoor environment into the shell 10, and when the fresh air fan is closed, if the indoor fan 1 is opened, the air in the outdoor environment can also be sucked into the shell 10; when the fresh air fan is turned off, if the indoor fan 1 is turned off, it is difficult for air in the outdoor environment to enter the casing 10.
The indoor air outlet 13 may be provided with an air outlet regulating assembly, which may include an air deflector, which may be used to close or open the indoor air outlet 13. The broken line and the solid line in fig. 1 represent two states when the indoor air outlet 13 is closed and opened, respectively. Specifically, when the indoor air outlet 13 is opened and the indoor fan 1 is turned on, air in the indoor environment can enter the housing 10 from the indoor air return port 12 to exchange heat with the indoor heat exchanger 2, and the air after heat exchange can be sent into the indoor environment from the indoor air outlet 13.
Further, the air conditioner further comprises an outdoor fan 6 arranged corresponding to the outdoor heat exchanger, and air can be blown from the outdoor heat exchanger to the outdoor environment when the outdoor fan 6 is used.
Further, in this embodiment, the fresh air outlet 14 is specifically a water outlet of the casing, the water outlet is specifically communicated with the water receiving tray of the indoor heat exchanger 2, the water outlet is used for discharging the condensed water generated in the casing 10 to the outside, the water outlet is specifically located at the air outlet side of the indoor fan 1, and when the indoor air outlet 13 is closed and the indoor fan 1 is opened, the air in the casing 10 can be discharged from the water outlet to the outside.
Further, the air conditioner may further include a temperature detection module 7 for detecting temperature data related to air conditioning control. Specifically, the temperature detection module 7 may be disposed at the positions of the outdoor heat exchanger, the indoor heat exchanger 2, the outdoor environment, the indoor air return 12, etc. according to actual requirements, so as to be used for detecting parameters such as the heat exchanger temperature, the outdoor environment temperature, the indoor environment temperature, etc.
The embodiment of the invention provides a control device of an air conditioner, which can be applied to control the air conditioner.
In an embodiment of the present invention, referring to fig. 2, a control device of an air conditioner includes: a processor 1001 (e.g., CPU), a memory 1002, and the like. The memory 1002 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1002 may alternatively be a storage device separate from the processor 1001 described above.
The indoor fan 1, the outdoor fan 6, the compressor 3, the four-way valve 4, the electronic expansion valve 5, the temperature detection module 7, the air outlet regulating and controlling component, the fresh air regulating and controlling component and the like in the air conditioner are all connected with the control device.
It will be appreciated by those skilled in the art that the device structure shown in fig. 2 is not limiting of the device and may include more or fewer components than shown, or certain components may be combined, or a different arrangement of components.
As shown in fig. 2, a control program of an air conditioner may be included in a memory 1002 as a computer-readable storage medium. In the apparatus shown in fig. 2, a processor 1001 may be used to call a control program of an air conditioner stored in a memory 1002 and perform the relevant step operations of the control method of the air conditioner of the following embodiment.
The embodiment of the invention also provides a control method of the air conditioner, which is applied to control the air conditioner.
Referring to fig. 3, an embodiment of a control method of an air conditioner according to the present application is provided. In this embodiment, the control method of the air conditioner includes:
Step S10, controlling the defrosting operation of the air conditioner in response to a defrosting instruction;
The defrosting instruction is specifically an air conditioner control instruction for starting the air conditioner to enter defrosting operation, and can be input by a user based on actual requirements, or can be automatically generated by the air conditioner based on monitoring results of outdoor working conditions (such as outdoor environment temperature, outdoor heat exchanger temperature and the like).
When the defrosting instruction is detected, the air conditioner can be controlled to operate in a refrigerating mode, the indoor heat exchanger is in an evaporating state to absorb heat in the refrigerating state, the outdoor heat exchanger is in a condensing state to release heat, and the heat released by the refrigerant in the outdoor heat exchanger can enable frost of the outdoor unit to be melted, so that defrosting of the air conditioner is achieved.
Specifically, in this embodiment, the defrosting in the refrigerating state of the air conditioner specifically means that the compressor is started, the four-way valve operates in a refrigerating valve position, and under the flow direction adjusting effect of the four-way valve, the refrigerant flowing out of the compressor flows back to the compressor after sequentially passing through the outdoor heat exchanger, the electronic expansion valve and the indoor heat exchanger, and the outdoor heat exchanger is used as the refrigerant of the condenser to emit heat to melt the frost on the outdoor heat exchanger, even in other areas of the outdoor unit. Besides the refrigerating operation of the air conditioner, the electronic expansion valve can synchronously operate at an opening degree larger than or equal to a set opening degree threshold (such as the maximum opening degree of the electronic expansion valve allowed to operate), so that the throttling effect of the electronic expansion valve is reduced, and the temperature of the refrigerant in the outdoor heat exchanger is further improved, so that quick defrosting is realized. In addition, in other embodiments, when defrosting in the heating state of the air conditioner, fresh air can be introduced to exchange heat with the indoor heat exchanger according to the subsequent steps.
Further, after the electronic expansion valve operates for a set period of time at an opening greater than a set opening threshold, the temperature of the outdoor heat exchanger of the air conditioner can be obtained; and controlling the electronic expansion valve to reduce the opening according to the temperature of the outdoor heat exchanger. Specifically, the adjustment range of the opening degree of the electronic expansion valve can be increased along with the increase of the temperature of the outdoor heat exchanger, and based on the adjustment range, the electronic expansion valve is reduced to a lower opening degree as the temperature of the outdoor heat exchanger is higher, so that the high-temperature refrigerant is deposited to the second half section of the outdoor heat exchanger through the reduction of the opening degree of the electronic expansion valve after the defrosting of the first half section of the outdoor heat exchanger close to the refrigerant inlet is finished, and the defrosting efficiency and the frost removal of the second half section of the outdoor heat exchanger are improved.
It should be noted that, when the refrigeration defrosting is started, the outdoor fan can be controlled to be turned off so as to ensure the defrosting effect of the outdoor unit.
Step S20, opening the fresh air inlet and controlling the indoor fan to be started; when the indoor fan is started, outdoor air enters the air duct from the fresh air inlet to exchange heat with the indoor heat exchanger.
Specifically, a fresh air control valve arranged in the fresh air duct or at the fresh air inlet can be controlled to be opened so as to open the fresh air inlet, the indoor fan can be synchronously controlled to be opened when the fresh air inlet is opened, and air in the outdoor environment can enter the shell from the fresh air inlet when the indoor fan is opened so as to exchange heat with the indoor evaporator.
The opening of the fresh air inlet and the opening of the indoor fan can be synchronously started when the air conditioner starts refrigerating defrosting, and can also be started after the air conditioner starts refrigerating defrosting for a certain period of time. Specifically, in this embodiment, the fresh air inlet and the indoor fan may be turned on in a delayed manner after the air conditioner starts the refrigeration operation for a certain period of time, and specifically, the delay period of time may be determined according to the coil temperature of the outdoor heat exchanger when the refrigeration defrosting is started, where the lower the coil temperature is, the shorter the delay period of time is.
The indoor fan can be operated at a preset rotating speed when being started, and the operating rotating speed of the indoor fan can be determined according to the actual operating condition of the defrosting process of the air conditioner.
Further, in order to prevent the cold air after heat exchange of the indoor evaporator from entering the indoor environment to affect the thermal comfort of indoor users, the indoor air outlet may be closed before the step of controlling the indoor fan to be turned on.
Furthermore, in order to smoothly discharge the air after heat exchange out of the shell so as to enhance the flow of the air flow in the shell and improve the heat exchange efficiency of the indoor heat exchanger, when the shell is further provided with a water outlet communicated with the outside, the water outlet can be opened besides closing the indoor air outlet before the indoor fan is opened. The opening of the exhaust port and the closing of the indoor air outlet can be performed simultaneously or sequentially according to actual requirements, and the sequence is not particularly limited. Based on this, when indoor fan operation, fresh air enters into in the casing and after carrying out heat transfer with indoor heat exchanger, can follow the outlet and discharge outdoors, through this mode, the casing can not need to set up extra gas vent, also can avoid cold wind to enter into indoor environment and influence indoor travelling comfort and strengthen indoor heat exchanger's heat exchange efficiency simultaneously to improve the defrosting effect of return air temperature reinforcing outdoor heat exchanger.
According to the control method of the air conditioner, in the defrosting process of the air conditioner in response to the defrosting instruction, fresh air is introduced into the air conditioner to exchange heat with the indoor heat exchanger by starting the fresh air and controlling the indoor fan to start, and based on the control method, the heat exchange of the indoor evaporator in the defrosting process can be guaranteed not to stop, but the heat exchange state is maintained through fresh air drainage, so that the air return temperature of the system is effectively prevented from being too low, the heat exchange output capacity of the system in the defrosting process is improved, and the defrosting effect of the outdoor unit is effectively improved.
Further, based on the above embodiment, another embodiment of the control method of the air conditioner of the present application is provided. In this embodiment, referring to fig. 4, before step S20, the method further includes:
step S101, acquiring outdoor environment temperature and indoor heat exchanger temperature in the defrosting operation process of the air conditioner;
Specifically, when the defrosting of the air conditioner is started for a certain period of time, the data detected by the temperature detection module in the outdoor environment can be read in real time to obtain the outdoor environment temperature, and the data detected by the temperature detection module on the coil pipe (such as the middle part of the coil pipe) of the indoor heat exchanger can be synchronously read to obtain the indoor heat exchanger temperature.
Step S102, determining a temperature difference value between the outdoor environment temperature and the indoor heat exchanger temperature;
The temperature difference value here refers in particular to the absolute value of the difference between the outdoor ambient temperature and the indoor heat exchanger temperature.
Step S103, judging whether the temperature of the indoor heat exchanger is smaller than the outdoor environment temperature or not, and judging whether the temperature difference value is larger than or equal to a set value or not;
and if the indoor heat exchanger temperature is smaller than the outdoor environment temperature and the temperature difference value is larger than or equal to a set value, executing step S20.
Here, only when guaranteeing that outdoor ambient temperature is higher than indoor heat exchanger temperature and two temperatures reach certain difference in temperature, just introduce the fresh air in the casing with indoor heat exchanger heat transfer, be favorable to guaranteeing indoor heat exchanger's heat transfer effect to further ensure outdoor defrosting effect's effective improvement.
Further, in this embodiment, in order to ensure that the heat exchange effect between the introduced fresh air and the indoor heat exchanger is further improved, the specific step of controlling the opening of the indoor fan includes:
S21, determining the target rotating speed of the indoor fan according to the temperature difference value;
Specifically, different temperature difference values correspond to different target rotational speeds of the indoor fan. The larger the temperature difference value is, the larger the target rotating speed is; conversely, the smaller the temperature difference value, the smaller the target rotation speed. The corresponding relation between the temperature difference value and the rotating speed of the indoor fan can be preset, and can be a mapping relation, a calculation formula and the like. Based on the corresponding relation, the target rotating speed of the indoor fan operation corresponding to the current temperature difference value can be determined. For example, the target rotational speed may be calculated by n=a×Δt, where N is the target rotational speed of the indoor fan, a is a preset constant, and Δt is a temperature difference value.
And S22, controlling the indoor fan to run according to the target rotating speed.
In this embodiment, the step S21 and the step S22 control the indoor fan to start introducing fresh air, so that the introduced fresh air volume can be matched with the heat exchange capacity of the indoor heat exchanger, the best heat exchange effect between the indoor heat exchanger and the fresh air is ensured, the overall heat exchange capacity of the refrigerant system is further improved, the temperature of the refrigerant entering the outdoor heat exchanger is further improved, and the defrosting effect of the outdoor unit is effectively improved.
Further, in this embodiment, the step of determining the target rotation speed of the indoor fan according to the temperature difference value includes:
Step S211, acquiring temperature characteristic parameters of the outdoor heat exchanger;
The temperature characteristic parameter may be the coil temperature currently detected by the outdoor heat exchanger, or may be a change parameter (such as a change amplitude, a change rate, a change trend, etc.) of the coil temperature in a period of time corresponding to the time from the start time of defrosting of the refrigerator to the current time of the outdoor heat exchanger.
Step S212, obtaining the corresponding relation between the temperature difference and the rotating speed according to the temperature characteristic parameters of the outdoor heat exchanger;
the corresponding relation between the temperature difference and the rotating speed is specifically characterized by the corresponding relation between the temperature deviation between the outdoor environment and the indoor heat exchanger and the running rotating speed of the indoor fan. The corresponding relation between the temperature difference and the rotating speed can be preset, and the temperature characteristic parameters of different outdoor heat exchangers can respectively correspond to the corresponding relation between the different temperature differences and the rotating speed. Specifically, the lower the current coil temperature of the outdoor heat exchanger is, the larger the indoor fan rotating speed corresponding to the temperature value in the obtained corresponding relation can be; or the larger the temperature change amplitude of the outdoor heat exchanger after the refrigeration defrosting is started, the smaller the indoor fan rotating speed corresponding to the temperature value in the obtained corresponding relation.
Step S213, determining the target rotating speed of the indoor fan corresponding to the temperature difference value based on the corresponding relation between the temperature difference and the rotating speed.
Specifically, the rotation speed of the indoor fan corresponding to the temperature difference value in the obtained corresponding relation is taken as the target rotation speed.
In this embodiment, the corresponding relationship between the temperature difference and the indoor fan rotation speed is obtained by adapting to the defrosting condition of the outdoor heat exchanger, so that the accuracy of the determined indoor fan rotation speed is further improved, and when the determined target rotation speed controls the indoor fan to operate, the introduced fresh air volume can effectively improve the defrosting effect of the outdoor unit.
Further, based on any one of the above embodiments, a further embodiment of the control method of the air conditioner of the present application is provided. In this embodiment, referring to fig. 5, after step S20, the method further includes:
Step S30, acquiring temperature change parameters of the outdoor heat exchanger; the temperature change parameter is a characteristic parameter of temperature change in the defrosting operation process of the air conditioner;
The temperature change parameters comprise the characteristic parameters of temperature change amplitude, temperature change rate, temperature change curve, temperature change trend and the like, wherein the characteristic parameters represent the temperature change of the outdoor heat exchanger in the defrosting process. Specifically, in this embodiment, the temperature variation parameter may specifically refer to a variation characteristic parameter of the refrigerant outlet temperature of the outdoor heat exchanger coil.
Specifically, step S30 herein may be performed at a certain period of time during which the air conditioner is operated to defrost, or at a set period of time after step S20 is performed.
In this embodiment, the temperature change parameter refers to a temperature change range from the start of defrosting to the current moment, and a first temperature and a second temperature of the outdoor heat exchanger are obtained; the first temperature is the temperature detected when the air conditioner starts the defrosting in a refrigerating state, and the second temperature is the temperature detected currently; and determining a temperature difference between the second temperature and the first temperature as the temperature change parameter. Specifically, the first temperature is T1, the second temperature is T2, and the temperature variation parameter is |T1-T2|.
Step S40, determining the operation parameters of the outdoor fan according to the temperature change parameters;
the operation parameters of the outdoor fan comprise control parameters for opening or closing the outdoor fan, the operation rotating speed of the outdoor fan, the operation steering of the outdoor fan and the like.
Different temperature change parameters correspond to different operating parameters of the outdoor fan. Specifically, in this embodiment, different temperature differences correspond to different operating parameters of the outdoor fan. If the temperature difference is smaller than a set threshold value, determining that the operation parameter is closing of the outdoor fan; and if the temperature difference is greater than or equal to a set threshold, determining the operation parameter as starting the outdoor fan. The set threshold is greater than or equal to 0, and the specific size can be set according to practical situations. The temperature difference is smaller than a set threshold value, so that the overall temperature of the outdoor heat exchanger is low, most of frost is not melted after defrosting is started, and the outdoor fan can be controlled to be turned off; the temperature difference is greater than or equal to a set threshold, indicating that the frost on the outdoor heat exchanger has melted a portion, at which time the outdoor fan may be controlled to turn on.
Specifically, the outdoor heat exchanger comprises an inner side and an outer side, and the distance between the outer side of the outdoor heat exchanger and an outdoor air outlet of the air conditioner is smaller than that between the inner side of the outdoor heat exchanger and the outdoor air outlet of the air conditioner. The refrigerant inlet of the outdoor heat exchanger coil can be arranged on the inner side, and the refrigerant outlet can be arranged on the outer side, so that the high-temperature refrigerant flowing out of the compressor flows from the inner side of the outdoor heat exchanger coil to the outer side of the outdoor heat exchanger coil. The outdoor fan is started to control the outdoor fan to set the steering operation, the outdoor fan blows from the inner side to the outer side in the air flow direction during the set steering operation, the residual heat after defrosting of the inner side refrigerant can be blown to the outer side coil pipe to defrost the outer side coil pipe, and the efficient improvement of defrosting efficiency of the outdoor heat exchanger is facilitated.
Specifically, the running rotation speed of the outdoor fan when being started can be determined according to the current rotation speed of the indoor fan. The rotational speed of the indoor fan may be determined in the manner mentioned in the above embodiments.
And S50, controlling the operation of the outdoor fan according to the operation parameters.
In this embodiment, the temperature change parameter of the outdoor heat exchanger after defrosting is started can represent the defrosting progress of the outdoor heat exchanger, and based on the temperature change parameter, the operation of the outdoor fan is regulated and controlled by the temperature change parameter, so that the operation of the outdoor fan can be matched with the defrosting progress of the outdoor heat exchanger, and the operation of the outdoor fan can be matched with the heat exchange condition of the outdoor heat exchanger to effectively improve the defrosting efficiency. The outdoor fan is turned off when most of the frost of the outdoor heat exchanger is not melted, so that the heat of the outdoor heat exchanger can be effectively prevented from being radiated, and the outdoor heat exchanger has higher temperature to intensively radiate the frost on the coil pipe so as to quickly melt the frost; when the temperature difference is large after defrosting is started, the fact that the coil pipe of the outdoor heat exchanger has partial areas is indicated to finish defrosting, at the moment, the air flow flux of the outdoor unit can be increased by starting the outdoor fan, so that heat of a refrigerant can be rapidly dissipated to different areas of the outdoor heat exchanger, the residual frost of the outdoor heat exchanger is melted, and defrosting effect and efficiency of the outdoor heat exchanger are effectively improved.
In addition, the embodiment of the invention also provides a computer readable storage medium, wherein the computer readable storage medium stores a control program of the air conditioner, and the control program of the air conditioner realizes the relevant steps of any embodiment of the control method of the air conditioner when being executed by a processor.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as described above, comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method according to the embodiments of the present invention.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.

Claims (5)

1. The control method of the air conditioner is characterized by comprising a shell, an indoor heat exchanger and an indoor fan, wherein the shell is provided with a fresh air inlet, an indoor air outlet and a water outlet, an air duct is arranged in the shell, the fresh air inlet is communicated with the air duct, the indoor heat exchanger and the indoor fan are arranged in the air duct, the water outlet is communicated with the outside, and the control method of the air conditioner comprises the following steps:
Controlling the defrosting operation of the air conditioner in response to a defrosting instruction, wherein an electronic expansion valve is controlled to operate at a maximum opening degree, and the opening degree adjustment amplitude of the electronic expansion valve is in an increasing trend along with the increase of the temperature of the outdoor heat exchanger;
acquiring an outdoor environment temperature and the indoor heat exchanger temperature in the defrosting operation process of the air conditioner;
Determining a temperature difference value between the outdoor environment temperature and the indoor heat exchanger temperature;
If the temperature of the indoor heat exchanger is smaller than the outdoor environment temperature and the temperature difference value is larger than or equal to a set value, starting the fresh air inlet, and controlling the indoor fan to be started;
When the indoor fan is started, outdoor air enters the air duct from the fresh air inlet to exchange heat with the indoor heat exchanger, and before the indoor fan is started, an indoor air outlet is closed and the water outlet is opened, wherein fresh air subjected to heat exchange when the indoor fan is started is discharged outdoors from the water outlet;
the step of controlling the indoor fan to be started comprises the following steps:
determining the target rotating speed of the indoor fan according to the temperature difference values, wherein different temperature difference values correspond to different target rotating speeds of the indoor fan, and the larger the temperature difference value is, the larger the target rotating speed is, and the smaller the temperature difference value is, the smaller the target rotating speed is;
controlling the indoor fan to run according to the target rotating speed;
The step of determining the target rotating speed of the indoor fan according to the temperature difference value comprises the following steps:
Acquiring a temperature characteristic parameter of the outdoor heat exchanger;
Acquiring the corresponding relation between the temperature difference value and the rotating speed according to the temperature characteristic parameters of the outdoor heat exchanger, wherein the corresponding relation between the temperature difference value and the rotating speed is the corresponding relation between the temperature deviation between the outdoor environment and the indoor heat exchanger and the running rotating speed of the indoor fan, a plurality of corresponding relations between the temperature difference value and the rotating speed are preset, the temperature characteristic parameters of different outdoor heat exchangers respectively correspond to the corresponding relations between the different temperature difference values and the rotating speed, and the lower the temperature of the current coil pipe of the outdoor heat exchanger is, the larger the rotating speed of the indoor fan corresponding to the temperature value in the corresponding relation between the temperature difference value and the rotating speed is, and the larger the temperature change amplitude of the outdoor heat exchanger after the refrigeration defrosting is started is, the smaller the rotating speed of the indoor fan corresponding to the temperature value in the corresponding relation between the temperature difference value and the rotating speed is;
determining a target rotating speed of the indoor fan corresponding to the temperature difference value based on the corresponding relation between the temperature difference value and the rotating speed;
after the step of controlling the electronic expansion valve of the air conditioner to operate at the maximum opening degree, the method further comprises the following steps:
Setting time length at intervals, and acquiring the temperature of an outdoor heat exchanger of the air conditioner;
controlling the electronic expansion valve to reduce the opening according to the temperature of the outdoor heat exchanger;
After the step of controlling the indoor fan to be started, the method further comprises the following steps:
acquiring a temperature change parameter of the outdoor heat exchanger; the temperature change parameter is a characteristic parameter of temperature change in the defrosting operation process of the air conditioner;
Determining the operation parameters of the outdoor fan according to the temperature change parameters;
Controlling the operation of the outdoor fan according to the operation parameters;
the step of obtaining the temperature change parameter of the outdoor heat exchanger of the air conditioner comprises the following steps:
Acquiring a first temperature and a second temperature of the outdoor heat exchanger; the first temperature is the temperature detected when the air conditioner starts the defrosting in a refrigerating state, and the second temperature is the temperature detected currently;
Determining a temperature difference between the second temperature and the first temperature as the temperature variation parameter;
the step of determining the operation parameters of the outdoor fan according to the temperature variation parameters comprises the following steps:
if the temperature difference is smaller than a set threshold value, determining that the operation parameter is closing of the outdoor fan;
And if the temperature difference is greater than or equal to the set threshold, determining the operation parameter to be the opening of the outdoor fan, wherein the set threshold is greater than or equal to 0.
2. The method of controlling an air conditioner as claimed in claim 1, wherein the turning on the outdoor fan includes controlling the outdoor fan to set a turning operation;
The outdoor heat exchanger comprises an inner side and an outer side, the distance between the outer side of the outdoor heat exchanger and an outdoor air outlet of the air conditioner is smaller than that between the inner side of the outdoor heat exchanger and the outdoor air outlet of the air conditioner, and the air flow direction of the outdoor fan blows from the inner side to the outer side when the outdoor fan turns to operate according to the set direction.
3. A control device of an air conditioner, characterized in that the control device of an air conditioner comprises: a memory, a processor, and a control program of an air conditioner stored on the memory and operable on the processor, which when executed by the processor, realizes the steps of the control method of an air conditioner according to any one of claims 1 to 2.
4. An air conditioner, characterized in that the air conditioner comprises:
The device comprises a shell, a fan and a fan, wherein the shell is provided with a fresh air inlet, an air channel is arranged in the shell, and the fresh air inlet is communicated with the air channel;
The indoor heat exchanger is arranged in the air duct;
the indoor fan is arranged in the air duct; and
The control device of the air conditioner as set forth in claim 3, wherein the indoor fan is connected to the control device.
5. A computer-readable storage medium, wherein a control program of an air conditioner is stored on the computer-readable storage medium, which when executed by a processor, implements the steps of the control method of an air conditioner according to any one of claims 1 to 2.
CN202011621728.8A 2020-12-30 2020-12-30 Air conditioner, control method and device thereof and readable storage medium Active CN114688630B (en)

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Publication number Priority date Publication date Assignee Title
CN107894061A (en) * 2017-10-23 2018-04-10 合肥美的暖通设备有限公司 Fresh air conditioner-mechanical, defrosting method and computer-readable recording medium

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