CN110220277B - Control method and device of air conditioner and air conditioner - Google Patents

Control method and device of air conditioner and air conditioner Download PDF

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Publication number
CN110220277B
CN110220277B CN201910499936.6A CN201910499936A CN110220277B CN 110220277 B CN110220277 B CN 110220277B CN 201910499936 A CN201910499936 A CN 201910499936A CN 110220277 B CN110220277 B CN 110220277B
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air conditioner
temperature difference
air
heat exchange
indoor
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CN110220277A (en
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郑根
刘志财
谭双
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Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—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
    • F24F11/70—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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • 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)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Fluid Mechanics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides a control method and a control device of an air conditioner and the air conditioner, and relates to the technical field of air conditioners, wherein the control device of the air conditioner comprises an indoor heat exchanger and a control module; the control module is in communication connection with the indoor heat exchanger; the indoor heat exchanger comprises a first heat exchange unit, a second heat exchange unit and a communication unit; the two ends of the communication unit are respectively connected with the first heat exchange unit and the second heat exchange unit; the control module controls the first heat exchange unit, the second heat exchange unit and the communication unit to operate according to the operation mode of the air conditioner. According to the control device of the air conditioner, the indoor heat exchanger is arranged into the two heat exchange units, when the air conditioner operates in a dehumidification mode, dehumidification is achieved under the condition that the compressor does not shut down, the service life of the compressor is prolonged, and energy consumption is reduced; meanwhile, the dehumidification capacity of the air conditioner is enhanced, and the dehumidification speed is increased.

Description

Control method and device of air conditioner and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method and device of an air conditioner and the air conditioner.
Background
The air conditioner has three functions of refrigeration, heating and dehumidification; the flow direction of the refrigerant in the dehumidification mode and the refrigeration mode of the existing air conditioner is the same, so that the existing air conditioner has no essential difference when the dehumidification mode and the refrigeration mode are operated, and the low-temperature air supply is avoided only by controlling the compressor to operate intermittently and reducing the air speed of an indoor fan in the dehumidification mode; however, this control method requires frequent start and stop of the compressor, which affects the service life of the compressor.
Disclosure of Invention
The invention solves the problem that the service life of the compressor is influenced because the compressor needs to be started and stopped frequently in the dehumidification process of the air conditioner in the prior art.
In order to solve the above problems, the present invention provides a control device for an air conditioner, which comprises an indoor heat exchanger and a control module;
the control module is in communication connection with the indoor heat exchanger;
the indoor heat exchanger comprises a first heat exchange unit, a second heat exchange unit and a communication unit;
the two ends of the communication unit are respectively connected with the first heat exchange unit and the second heat exchange unit;
the control module controls the first heat exchange unit, the second heat exchange unit and the communication unit to operate according to the operation mode of the air conditioner, so that when the operation mode of the air conditioner is a cooling mode or a heating mode, the first heat exchange unit is connected with the second heat exchange unit in parallel; and when the operation mode of the air conditioner is a dehumidification mode, the first heat exchange unit and the second heat exchange unit are connected in series.
According to the control device of the air conditioner, the indoor heat exchanger is arranged into the two heat exchange units, and when the air conditioner operates in a dehumidification mode, the flow path of a refrigerant is changed, so that dehumidification is realized under the condition that the compressor does not shut down, the service life of the compressor is prolonged, and the energy consumption is reduced; meanwhile, the dehumidification capacity of the air conditioner is enhanced, and the dehumidification speed is increased.
Further, the communication unit comprises a third electromagnetic valve, a first communication pipeline and a second communication pipeline which are respectively connected to two ends of the third electromagnetic valve, wherein the first communication pipeline is connected with the first heat exchange unit; and the second communication pipeline is connected with the second heat exchange unit.
The control device of the air conditioner provided by the invention adjusts the flow direction of the refrigerant by controlling the opening and closing of the third electromagnetic valve, changes the flow path of the refrigerant and further adjusts the connection relation between the first heat exchange unit and the second heat exchange unit.
Further, the first heat exchange unit comprises a first electromagnetic valve, a first electronic expansion valve and a first indoor heat exchanger which are sequentially connected through a pipeline; the second heat exchange unit comprises a second electronic expansion valve, a second indoor heat exchanger and a second electromagnetic valve which are sequentially connected through a pipeline; the first communicating pipeline is connected with a pipeline between the first electromagnetic valve and the first electronic expansion valve; and the second communication pipeline is connected with the second electromagnetic valve and a pipeline between the second indoor heat exchanger.
The control module controls the first electromagnetic valve, the first electronic expansion valve, the second electromagnetic valve, the second electronic expansion valve and the third electromagnetic valve to regulate the flow direction of a refrigerant, so that the indoor temperature is kept stable under the condition that the compressor does not stop running, and the use comfort of a user is improved.
Another object of the present invention is to provide a control method for an air conditioner, which is used for the control device for an air conditioner, and comprises:
acquiring an operation mode of the air conditioner;
if the operation mode is a refrigeration mode or a heating mode, controlling the first heat exchange unit and the second heat exchange unit to be connected in parallel;
and if the operation mode is a dehumidification mode, controlling the first heat exchange unit and the second heat exchange unit to be connected in series.
According to the control method of the air conditioner, the indoor heat exchanger is set into the two heat exchange units, and when the air conditioner operates in a dehumidification mode, the flow path of a refrigerant is changed, so that dehumidification is realized under the condition that the compressor does not shut down, the service life of the compressor is prolonged, and energy consumption is reduced; meanwhile, the dehumidification capacity of the air conditioner is enhanced, and the dehumidification speed is increased.
Further, the controlling the first heat exchange unit and the second heat exchange unit to be connected in parallel includes: and closing the third electromagnetic valve, and opening the first electromagnetic valve and the second electromagnetic valve.
According to the control method of the air conditioner, the third electromagnetic valve is closed, and the first electromagnetic valve and the second electromagnetic valve are opened, so that the first heat exchange unit and the second heat exchange unit are connected in parallel, and therefore when the air conditioner operates in a refrigerating mode or a heating mode, air in an indoor unit is sequentially cooled or heated through the two indoor heat exchangers, the refrigerating capacity and the heating capacity of the air conditioner are improved, and the using comfort level of a user is improved.
Further, the controlling the first heat exchange unit and the second heat exchange unit to be connected in series includes: and opening the third electromagnetic valve, and closing the first electromagnetic valve and the second electromagnetic valve.
According to the control method of the air conditioner, when the air conditioner operates in a dehumidification mode, the two indoor heat exchangers are connected in series, air is dehumidified and heated through the two indoor heat exchangers respectively, the dehumidified and cooled air is heated and then discharged into a room, and under the condition that the compressor operates without stopping, the purposes of dehumidifying the air and maintaining the temperature of the dehumidified air to be stable are achieved.
Further, the controlling the first heat exchange unit and the second heat exchange unit to be connected in series after the third electromagnetic valve is opened and the first electromagnetic valve and the second electromagnetic valve are closed further includes: opening the opening degree of the second electronic expansion valve to a maximum opening degree; and adjusting the rotating speed of the outdoor fan to the highest rotating speed.
According to the control method of the air conditioner, when the dehumidification mode starts to operate, the opening degree of the second electronic expansion valve is firstly opened to the maximum opening degree, and the rotating speed of the outdoor fan is adjusted to the maximum rotating speed, so that the air conditioner system can be started smoothly.
Further, the opening degree of the second electronic expansion valve is opened to a maximum opening degree; after will the rotational speed of outdoor fan adjusts to the maximum rotational speed, still include:
acquiring an air inlet and outlet temperature difference delta T of an indoor unit of the air conditioner;
and controlling the operation of an outdoor fan according to the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner.
The control method of the air conditioner provided by the invention adjusts the operation condition of the outdoor fan according to the air inlet and outlet temperature difference delta T of the indoor unit; along with the change of the running condition of the outdoor fan, the heat release capacity of the outdoor heat exchanger is changed, so that the heat release quantity of the second indoor heat exchanger is changed, the air inlet and outlet temperature difference delta T of the indoor unit is adjusted, and the air outlet temperature of the air conditioner is kept stable.
Further, the controlling the operation of the outdoor fan according to the air inlet and outlet temperature difference Δ T of the indoor unit of the air conditioner includes:
comparing the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner with a standard temperature difference range;
if the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is within the standard temperature difference range, the outdoor fan operates at the existing rotating speed;
if the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is smaller than the minimum value in the standard temperature difference range, carrying out speed reduction processing on the rotating speed of the outdoor fan according to the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner;
and if the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is not smaller than the maximum value in the standard temperature difference range, performing speed increasing treatment on the rotating speed of the outdoor fan according to the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner.
According to the control method of the air conditioner, the air inlet and outlet temperature difference delta T of the indoor unit is compared with the standard temperature difference range, the rotating speed of the outdoor fan is adjusted according to the comparison result, and then the heat release quantity of the second indoor heat exchanger is adjusted, so that the purpose of adjusting the air outlet temperature of the indoor unit is achieved, and the indoor temperature is stable.
Further, if the air inlet and outlet temperature difference Δ T of the indoor unit of the air conditioner is not smaller than the maximum value in the standard temperature difference range, before the speed increase processing is performed on the rotating speed of the outdoor fan according to the air inlet and outlet temperature difference Δ T of the indoor unit of the air conditioner, the method further includes:
judging whether the rotating speed of the outdoor fan is the highest rotating speed or not;
if the rotating speed of the outdoor fan is the highest rotating speed, acquiring a first operation time length of the outdoor fan at the highest rotating speed;
if the first operation time length reaches a first preset operation time length, judging whether the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is not less than the maximum value in the standard temperature difference range;
and if the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is not smaller than the maximum value in the standard temperature difference range, controlling the operation of the second electronic expansion valve according to the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner.
According to the control method of the air conditioner, after the rotating speed of the outdoor fan is adjusted to the highest rotating speed, if the indoor air outlet temperature is still high, the heat release quantity of the second indoor heat exchanger is further adjusted through the second electronic expansion valve, and the purpose of maintaining the indoor temperature stable is achieved.
Further, the controlling the operation of the second electronic expansion valve according to the air inlet and outlet temperature difference Δ T of the indoor unit of the air conditioner includes:
comparing the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner with a standard temperature difference range;
if the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is within the standard temperature difference range, the second electronic expansion valve operates at the existing opening degree;
if the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is smaller than the minimum value in the standard temperature difference range, the opening degree of the second electronic expansion valve is increased according to the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner;
and if the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is not smaller than the maximum value in the standard temperature difference range, reducing the opening degree of the second electronic expansion valve according to the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner.
According to the control method of the air conditioner, the air inlet and outlet temperature difference delta T of the indoor unit is compared with the standard temperature difference range, the opening degree of the second electronic expansion valve is adjusted according to the comparison result, and then the heat release quantity of the second indoor heat exchanger is adjusted, so that the purpose of adjusting the air outlet temperature of the indoor unit is achieved, and the indoor temperature is stable.
Further, if the difference Δ T between the inlet air temperature and the outlet air temperature of the indoor unit of the air conditioner is smaller than the minimum value in the standard temperature difference range, before increasing the opening degree of the second electronic expansion valve according to the difference Δ T between the inlet air temperature and the outlet air temperature of the indoor unit of the air conditioner, the method further includes:
judging whether the opening degree of the second electronic expansion valve is the maximum opening degree or not;
if the opening degree of the second electronic expansion valve is the maximum opening degree, acquiring a second operation time of the second electronic expansion valve at the maximum opening degree;
if the second operation time length reaches a second preset operation time length, judging whether the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is smaller than the minimum value in the standard temperature difference range;
and if the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is smaller than the minimum value in the standard temperature difference range, controlling the operation of the outdoor fan according to the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner.
According to the control method of the air conditioner, after the opening degree of the second electronic expansion valve is adjusted to the maximum opening degree, if the indoor air outlet temperature is still low, the heat release quantity of the second indoor heat exchanger is further adjusted through the rotating speed of the outdoor fan, and the purpose of maintaining the indoor temperature stable is achieved.
Another objective of the present invention is to provide an air conditioner including the control device of the air conditioner.
According to the air conditioner provided by the invention, the indoor heat exchanger is arranged into the two heat exchange units, and when the air conditioner operates in a dehumidification mode, the flow path of a refrigerant is changed, so that dehumidification is realized under the condition that the compressor does not shut down, the service life of the compressor is prolonged, and the energy consumption is reduced; meanwhile, the dehumidification capacity of the air conditioner is enhanced, and the dehumidification speed is increased.
Drawings
FIG. 1 is a system flow chart of an air conditioner control device according to the present invention;
FIG. 2 is a flow chart illustrating a method for controlling an air conditioner according to the present invention;
FIG. 3 is a flow chart illustrating a control method of the air conditioner according to the present invention when operating in the dehumidification mode;
FIG. 4 is a flow chart of the present invention for controlling the operation of an outdoor fan;
fig. 5 is a flow chart illustrating the operation of the second electronic expansion valve according to the present invention.
Description of reference numerals:
1-a first heat exchange unit; 11-a first solenoid valve; 12-a first electronic expansion valve; 13-a first indoor heat exchanger; 2-a second heat exchange unit; 21-a second solenoid valve; 22-a second electronic expansion valve; 23-a second indoor heat exchanger; 3-a communication unit; 31-a third solenoid valve; 32-a first communication pipeline; 33-second communication pipeline; 4-outdoor fan; 5-an indoor fan; 6-outdoor heat exchanger; 7-a compressor; a 8-four-way valve; 81-a first port; 82-a second port; 83-third port; 84-a fourth port; 9-air intake temperature sensor; 10-air outlet temperature sensor.
Detailed Description
When the existing air conditioner operates in a dehumidification mode, a flow path of a refrigerant is the same as a refrigeration mode, the temperature of air blown into an indoor unit by an indoor fan is reduced to be below a dew point temperature by utilizing the evaporation and heat absorption of an indoor heat exchanger, so that water vapor in the air is condensed and separated out from the air, and the aim of dehumidification is fulfilled; because the temperature in the indoor unit is low, the air conditioner is easy to blow out cold air in the dehumidification process, and the comfort degree of the user of the air conditioner is affected. In order to prevent the indoor temperature from being reduced in the dehumidification process, the existing air conditioner controls the compressor to alternately start and stop running when running in the dehumidification mode, for example, the compressor is started for 10 minutes and stopped for 6 minutes, and an indoor fan is enabled to keep running at low wind; the air conditioner has a slow dehumidification effect, and is easy to cause indoor temperature fluctuation, so that the comfort is reduced; meanwhile, frequent starting and stopping of the compressor affects the service life of the compressor, and power consumption is increased.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The invention provides a control device of an air conditioner, which comprises an indoor heat exchanger and a control module, wherein the control module is shown in figure 1; the control module is in communication connection with the indoor heat exchanger; the indoor heat exchanger comprises a first heat exchange unit 1, a second heat exchange unit 2 and a communication unit 3; two ends of the communication unit 3 are respectively connected with the first heat exchange unit 1 and the second heat exchange unit 2; the control module controls the first heat exchange unit 1, the second heat exchange unit 2 and the communication unit 3 to operate according to the operation mode of the air conditioner, so that when the operation mode of the air conditioner is a refrigeration mode or a heating mode, the first heat exchange unit 1 is connected with the second heat exchange unit 2 in parallel; when the operation mode of the air conditioner is the dehumidification mode, the first heat exchange unit 1 and the second heat exchange unit 2 are connected in series.
By controlling the communication unit 3, the first heat exchange unit 1 and the second heat exchange unit 2, when the air conditioner operates in a cooling or heating mode, the first heat exchange unit 1 and the second heat exchange unit 2 are connected in parallel, and air entering an indoor unit is cooled or heated at the same time, so that the cooling or heating effect of the air conditioner is ensured; when the air conditioner operates in a dehumidification mode, the first heat exchange unit 1 and the second heat exchange unit 2 are connected in series, and the first heat exchange unit 1 absorbs heat of air entering an indoor unit to achieve the purpose of dehumidification; the dehumidified air is heated through the second heat exchange unit 2, so that the cooled air enters the room again after the temperature of the air is raised, the indoor temperature is stable, and the use comfort of a user is improved; meanwhile, when the air conditioner operates in a dehumidification mode, the flow path of a refrigerant is changed, so that the indoor heat exchanger firstly cools the air in the indoor unit and then heats the air, dehumidification is realized under the condition that the compressor does not shut down, the service life of the compressor is prolonged, and energy consumption is reduced; in addition, because the temperature of the cooled air is further increased in the dehumidification process, compared with the conventional air conditioner, the air conditioner control device provided by the invention can lower the air temperature in the dehumidification process, so that more water vapor in the air is separated out, the dehumidification capacity is enhanced, and the dehumidification speed is increased.
According to the control device of the air conditioner, the indoor heat exchanger is arranged into the two heat exchange units, and when the air conditioner operates in a dehumidification mode, the flow path of a refrigerant is changed, so that dehumidification is realized under the condition that the compressor does not shut down, the service life of the compressor is prolonged, and the energy consumption is reduced; meanwhile, the dehumidification capacity of the air conditioner is enhanced, and the dehumidification speed is increased.
The communication unit 3 in the control device comprises a third electromagnetic valve 31, a first communication pipeline 32 and a second communication pipeline 33 which are respectively connected to two ends of the third electromagnetic valve 31, wherein the first communication pipeline 32 is connected with the first heat exchange unit 1; the second communication line 33 is connected to the second heat exchange unit 2.
The first communication pipeline 32 and the second communication pipeline 33 are used for transmitting refrigerants in the air conditioning system; the first communicating pipeline 32 and the second communicating pipeline 33 are respectively arranged at the two ends of the third electromagnetic valve 31, the first communicating pipeline 32 is connected with the first heat exchange unit 1, the second communicating pipeline 33 is connected with the second heat exchange unit 2, the flow direction of a refrigerant is adjusted by controlling the opening and closing of the third electromagnetic valve 31, the flow path of the refrigerant is changed, and the connection relation between the first heat exchange unit 1 and the second heat exchange unit 2 is further adjusted.
In order to facilitate the control module to adjust the connection relation between the first heat exchange unit 1 and the second heat exchange unit 2 according to the operation mode of the air conditioner, the first heat exchange unit 1 comprises a first electromagnetic valve 11, a first electronic expansion valve 12 and a first indoor heat exchanger 13 which are sequentially connected through a pipeline; the second heat exchange unit 2 comprises a second electronic expansion valve 22, a second indoor heat exchanger 23 and a second electromagnetic valve 21 which are connected in sequence through pipelines; the first communicating pipe 32 is connected with a pipe between the first electromagnetic valve 11 and the first electronic expansion valve 12; the second communication line 33 is connected to a line between the second solenoid valve 21 and the second indoor heat exchanger 23.
Wherein, the first electronic expansion valve 12 and the second electronic expansion valve 22 are both used for throttle control; the first indoor heat exchanger 13 and the second indoor heat exchanger 23 are used for exchanging heat with air inside the indoor unit; the second indoor heat exchanger 23 is further provided in front of the first indoor heat exchanger 13 in the present invention; the front direction in the invention refers to the direction close to the air outlet of the indoor unit.
The refrigerant flow direction is adjusted through the control of the control module on the first electromagnetic valve 11, the first electronic expansion valve 12, the second electromagnetic valve 21, the second electronic expansion valve 22 and the third electromagnetic valve 31, so that when the air conditioner operates in a dehumidification mode, the first indoor heat exchanger 13 dehumidifies air inside an indoor unit, and the second indoor heat exchanger 23 further heats the air dehumidified and cooled by the first indoor heat exchanger 13 and then discharges the air into the room, so that the indoor temperature is kept stable under the condition that the compressor operates without stopping, and the use comfort level of a user is improved.
In order to facilitate understanding of the operation process of the control device of the air conditioner provided by the present invention, another object of the present invention is to provide a control method of the air conditioner, and the control device of the air conditioner and the operation process of the control device will be described in detail below with reference to the control method of the air conditioner.
The control method of the air conditioner provided by the invention further adjusts the connection relation between the first heat exchange unit 1 and the second heat exchange unit 2 according to the operation mode of the air conditioner by acquiring the operation mode of the air conditioner; when the operation mode of the air conditioner is a cooling mode or a heating mode, the first heat exchange unit 1 and the second heat exchange unit 2 are controlled to be connected in parallel, so that the first heat exchange unit 1 and the second heat exchange unit 2 can cool or heat air in the indoor unit at the same time, and the cooling or heating capacity of the air conditioner is improved; when the operation mode of the air conditioner is a dehumidification mode, controlling the first heat exchange unit 1 and the second heat exchange unit 2 to be connected in series, so that the first heat exchange unit 1 dehumidifies air, and the dehumidification requirement of an air conditioner user is met; the air after the second heat exchange unit 2 heats the air after dehumidification, so that the air after dehumidification and cooling by the first heat exchange unit is heated and then discharged into the room, the air conditioner is prevented from blowing low-temperature air, and the comfort level of the user is improved.
Specifically, referring to fig. 2, the method for controlling an air conditioner according to the present invention includes:
s1: acquiring an operation mode of an air conditioner;
s2: judging whether the operation mode of the air conditioner is a dehumidification mode or not; if the operation mode of the air conditioner is the dehumidification mode, the step S4 is entered, otherwise, the step S3 is entered;
s3: controlling the first heat exchange unit 1 to be connected with the second heat exchange unit 2 in parallel;
s4: and controlling the first heat exchange unit 1 to be connected with the second heat exchange unit 2 in series.
Referring to fig. 1, when the air conditioner operates in a refrigeration mode, the refrigerant is divided into two paths after being released heat by the outdoor heat exchanger 6, the two paths of refrigerant respectively enter the first heat exchange unit 1 and the second heat exchange unit 2 to absorb heat, the two paths of refrigerant after absorbing heat are converged and enter the compressor 7 to be compressed, and the compressed refrigerant enters the outdoor heat exchanger 6 to release heat and sequentially circulate; after indoor air enters the indoor unit through the indoor fan 5, the indoor air sequentially passes through the first heat exchange unit 1 and the second heat exchange unit 2, and is absorbed by the first heat exchange unit 1 and the second heat exchange unit 2 to cool, so that the purpose of refrigeration is achieved.
Similar to the operation in the refrigeration mode, when the air conditioner operates in the heating mode, the high-temperature gaseous refrigerant discharged by the compressor 7 is divided into two paths, the two paths of high-temperature gaseous refrigerant respectively enter the first heat exchange unit 1 and the second heat exchange unit 2 to release heat, the heat-released refrigerant is converged and enters the outdoor heat exchanger 6 to absorb heat, and the heat-absorbed refrigerant enters the compressor 7 to be compressed and sequentially circulates; after indoor air enters the indoor unit through the indoor fan 5, the indoor air sequentially passes through the first heat exchange unit 1 and the second heat exchange unit 2 and is heated and warmed by the first heat exchange unit 1 and the second heat exchange unit 2, and the purpose of heating is achieved.
When the air conditioner operates in a dehumidification mode, the refrigerant enters the second heat exchange unit 2 to continuously release heat after being released by the outdoor heat exchanger 6; the heat-released refrigerant enters the first heat exchange unit 1 through the communication unit 3 to absorb heat, the heat-absorbed refrigerant enters the compressor 7 to be compressed, and the compressed refrigerant enters the outdoor heat exchanger 6 to release heat and sequentially circulate; after indoor air enters the indoor unit through the indoor fan 5, the indoor air firstly passes through the first heat exchange unit 1 and is subjected to heat absorption and temperature reduction by the first heat exchange unit 1, so that the aim of dehumidification is fulfilled; the air after the dehumidification cooling passes through second heat exchange unit 2, is heated by second heat exchange unit 2 and heaies up, and the air after the intensification is discharged indoor, under the condition that the compressor does not shut down, avoids the phenomenon that low temperature cold wind appears blowing in dehumidification in-process air conditioner, improves compressor life, when reducing the energy consumption, improves user's comfort level.
According to the control method of the air conditioner, the indoor heat exchanger is set into the two heat exchange units, and when the air conditioner operates in a dehumidification mode, the flow path of a refrigerant is changed, so that dehumidification is realized under the condition that the compressor does not shut down, the service life of the compressor is prolonged, and energy consumption is reduced; meanwhile, the dehumidification capacity of the air conditioner is enhanced, and the dehumidification speed is increased.
Specifically, when the operation mode of the air conditioner is a cooling or heating mode, controlling the first heat exchange unit 1 and the second heat exchange unit 2 to be connected in parallel comprises:
s31: the third solenoid valve 31 is closed, and the first and second solenoid valves 11 and 21 are opened.
After the third electromagnetic valve 31 is closed, the communication unit 3 is closed, so that the first heat exchange unit 1 and the second heat exchange unit 2 are connected in parallel; in order to change the flow direction of the refrigerant, the compressor 7 is connected with the four-way valve 8; the four-way valve 8 includes four ports, wherein a first port 81 is connected to an air outlet of the compressor 7, a second port 82 is connected to an air inlet of the compressor 7, a third port 83 is connected to the indoor heat exchanger, and a fourth port 84 is connected to the outdoor heat exchanger 6.
When the air conditioner operates in a cooling mode, the control module controls the conduction of the second port 82 and the third port 83 of the four-way valve 8, and the conduction of the first port 81 and the fourth port 84; the high-temperature gaseous refrigerant compressed by the compressor 7 enters the outdoor heat exchanger 6 after passing through the first port 81 and the fourth port 84 of the four-way valve 8; the refrigerant is divided into two paths after being released heat by the outdoor heat exchanger 6, wherein the first path of refrigerant enters the first heat exchange unit 1, enters the first electronic expansion valve 12 through the first electromagnetic valve 11 for throttling, and enters the first indoor heat exchanger 13 for absorbing heat after being throttled; the second refrigerant enters the second heat exchange unit 2, is throttled by the second electronic expansion valve 22, and enters the second indoor heat exchanger 23 to absorb heat after being throttled; the second path of refrigerant after absorbing heat is converged with the first path of refrigerant after absorbing heat after passing through the second electromagnetic valve 21, enters the compressor 7 through the third port 83 and the second port 82 of the four-way valve 8 for compression, and circulates in sequence; after the indoor air enters the indoor unit through the indoor fan 5, the indoor air sequentially passes through the first indoor heat exchanger 13 and the second indoor heat exchanger 23, and is absorbed by the first indoor heat exchanger 13 and the second indoor heat exchanger 23 to cool, so that the purpose of refrigeration is achieved.
When the air conditioner operates in a heating mode, the control module controls the second port 82 and the fourth port 84 of the four-way valve 8 to be communicated, and the first port 81 and the third port 83 to be communicated; the high-temperature gaseous refrigerant compressed by the compressor 7 is divided into two paths after passing through a first port 81 and a third port 83 of the four-way valve 8, the first path of refrigerant enters the first heat exchange unit 1, is released heat by the first indoor heat exchanger 13 and then enters the first electronic expansion valve 12 for throttling, and the throttled first path of refrigerant flows out of the first heat exchange unit 1 through the first electromagnetic valve 11; the second refrigerant enters the second indoor heat exchanger 23 to release heat after passing through the second solenoid valve 21, the second refrigerant after releasing heat is throttled by the second electronic expansion valve 22, the throttled second refrigerant is converged with the throttled first refrigerant and enters the outdoor heat exchanger 6 to absorb heat, and the refrigerant after absorbing heat enters the compressor 7 to be compressed through the fourth port 84 and the second port 82 of the four-way valve 8 and is sequentially circulated; after entering the indoor unit through the indoor fan 5, the indoor air passes through the first indoor heat exchanger 13 and the second indoor heat exchanger 23 in sequence and is heated by the first indoor heat exchanger 13 and the second indoor heat exchanger 23, so that the heating purpose is achieved.
According to the control method of the air conditioner, the third electromagnetic valve 31 is closed, the first electromagnetic valve 11 and the second electromagnetic valve 21 are opened, and the first heat exchange unit 1 and the second heat exchange unit are connected in parallel, so that when the air conditioner operates in a cooling mode or a heating mode, air in an indoor unit is cooled or heated through the two indoor heat exchangers in sequence, the cooling and heating capacity of the air conditioner is improved, and the use comfort level of a user is improved.
When the air conditioner operates in the dehumidification mode, as described with reference to fig. 3, controlling the first heat exchange unit 1 to be connected in series with the second heat exchange unit 2 includes:
s41: the third solenoid valve 31 is opened, and the first solenoid valve 11 and the second solenoid valve 21 are closed.
After the third electromagnetic valve 31 is opened and the first electromagnetic valve 11 and the second electromagnetic valve 21 are closed, the first heat exchange unit 1 and the second heat exchange unit 2 are communicated through the communication unit 3, so that the first heat exchange unit 1 and the second heat exchange unit 2 are connected in series; the flow direction of the refrigerant is adjusted to sequentially pass through the two heat exchange units, and the two heat exchange units respectively perform dehumidification, temperature reduction and heating temperature rise on the air flowing through, so that the stability of the indoor temperature is maintained.
For convenience of understanding, the flow direction of the refrigerant when the air conditioner operates in the dehumidification mode is described in detail herein, taking an example that the air is dehumidified in the first heat exchange unit and heated in the second heat exchange unit.
When the air conditioner operates in a dehumidification mode, the control module controls the second port 82 and the third port 83 of the four-way valve 8 to be communicated, and the first port 81 and the fourth port 84 to be communicated; the high-temperature gaseous refrigerant compressed by the compressor 7 enters the outdoor heat exchanger 6 after passing through the first port 81 and the fourth port 84 of the four-way valve 8; after the heat of the refrigerant is released by the outdoor heat exchanger 6, the refrigerant enters the second indoor heat exchanger 23 through the second electronic expansion valve 22 to continue releasing the heat, the refrigerant after releasing the heat enters the first electronic expansion valve 12 through the third electromagnetic valve 31 to be throttled, the throttled refrigerant enters the first indoor heat exchanger 13 to absorb the heat, the refrigerant after absorbing the heat enters the compressor 7 through the third port 83 and the second port 82 of the four-way valve 8 to be compressed, and the refrigerant is circulated in sequence; after indoor air enters the indoor unit through the indoor fan 5, the indoor air firstly absorbs heat and is cooled through the first indoor heat exchanger 13 so as to achieve the aim of dehumidification; the dehumidified and cooled air passes through the second indoor heat exchanger 23 and is heated by the second indoor heat exchanger 23, and the heated air is discharged into the room to maintain the indoor temperature stable.
According to the control method of the air conditioner, when the air conditioner operates in a dehumidification mode, the two indoor heat exchangers are connected in series, air is dehumidified and heated through the two indoor heat exchangers respectively, the dehumidified and cooled air is heated and then discharged into a room, and under the condition that the compressor operates without stopping, the purposes of dehumidifying the air and maintaining the temperature of the dehumidified air to be stable are achieved.
In order to maintain the temperature of the dehumidified air to be stable, the method for controlling the air conditioner according to the present invention further includes, after opening the third electromagnetic valve 31 and closing the first electromagnetic valve 11 and the second electromagnetic valve 21:
s42: opening the opening degree of the second electronic expansion valve 22 to the maximum opening degree; the rotation speed of the outdoor fan 4 is adjusted to the maximum rotation speed.
When the dehumidification mode starts to operate, initial conditions of the dehumidification operation are defined, firstly, the opening degree of the second electronic expansion valve 22 is opened to the maximum opening degree, so that the second electronic expansion valve 22 is not used for adjusting the outlet air temperature of the air conditioner for the moment, the rotating speed of the outdoor fan 4 is adjusted to the highest rotating speed, the rotating speed of the outdoor fan 4 is adjusted from the highest rotating speed, the outlet air temperature of the air conditioner is roughly adjusted through the outdoor fan 4, and when the rough adjustment cannot maintain the indoor temperature to be stable, the outlet air temperature of the air conditioner is finely adjusted through the second electronic expansion valve 22, so that the adjusting speed of the outlet air temperature of the air conditioner is improved.
Further, acquiring the continuous operation time of the dehumidification mode, judging that the air conditioner system operates stably when the continuous operation time reaches the preset continuous operation time, and further adjusting the operation state of the air conditioner; the present invention preferably has the preset duration of 2 minutes.
S43: acquiring an air inlet and outlet temperature difference delta T of an indoor unit of an air conditioner;
s44: and controlling the operation of the outdoor fan 4 according to the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner.
In order to adjust the heat exchange capacity of the outdoor heat exchanger 6, an outdoor fan 4 is arranged on the side of the outdoor unit; the air inlet and outlet temperature difference delta T of the indoor unit refers to the difference between the air outlet temperature T of the indoor unit and the air inlet temperature Ta of the indoor unit, namely delta T-Ta.
When the air conditioner operates in a dehumidification mode, the outdoor heat exchanger 6 and the second indoor heat exchanger 23 release heat, the first indoor heat exchanger 13 absorbs heat, and according to the law of conservation of energy, the sum of the heat absorbed by the first indoor heat exchanger 13 and the power consumption of the compressor 7 and the like is equal to the heat release of the outdoor heat exchanger 6 and the second indoor heat exchanger 23; adjusting the operation condition of the outdoor fan 4 according to the air inlet and outlet temperature difference delta T of the indoor unit; along with the change of the running condition of the outdoor fan 4, the heat release capacity of the outdoor heat exchanger 6 is changed, so that the heat release quantity of the second indoor heat exchanger 23 is changed, the air inlet and outlet temperature difference delta T of the indoor unit is adjusted, and the stability of the air outlet temperature of the air conditioner is maintained.
In order to obtain the air outlet temperature T and the air inlet temperature Ta of the indoor unit, the air conditioner control device further comprises an air inlet temperature sensor 9 arranged at the air inlet of the indoor unit, and an air outlet temperature sensor 10 arranged at the air outlet of the indoor unit; specifically, obtaining the air inlet and outlet temperature difference Δ T of the indoor unit of the air conditioner includes:
s431: acquiring the air outlet temperature T of the indoor unit;
s432: acquiring the air inlet temperature Ta of the indoor unit;
s433: and calculating the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner by the formula delta T-Ta.
In order to maintain the stable indoor temperature, as shown in fig. 4, the controlling the operation of the outdoor fan 4 according to the difference Δ T between the inlet air temperature and the outlet air temperature of the indoor unit of the air conditioner includes:
s441: comparing the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner with a standard temperature difference range;
s442: judging whether the air inlet and outlet temperature difference delta T of the indoor unit is in a standard temperature difference range or not; if the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is in the standard temperature difference range, the step S443 is executed, otherwise, the step S444 is executed;
s443: the outdoor fan 4 operates at the existing rotation speed;
s444: judging whether the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is smaller than the minimum value in the standard temperature difference range or not; if the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is smaller than the minimum value in the standard temperature difference range, the step S445 is executed, otherwise, the step S446 is executed;
s445: the rotating speed of the outdoor fan 4 is reduced according to the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner;
s446: judging whether the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is not less than the maximum value in the standard temperature difference range or not; if the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is not smaller than the maximum value in the standard temperature difference range, the step S447 is executed, otherwise, the step S441 is executed;
s447: and (4) increasing the rotating speed of the outdoor fan 4 according to the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner.
Wherein the specific value of the standard temperature difference range is determined according to the requirement of a customer; the preferred standard temperature difference range in the invention is [ -0.5, 0.5) ° c; when the temperature difference delta T of the inlet air and the outlet air is within the standard temperature difference range, the difference between the outlet air temperature and the inlet air temperature of the air conditioner is small, the condition that the outlet air of the air conditioner does not cause discomfort of a user of the air conditioner at the moment is judged, the heat exchange condition of the heat exchanger does not need to be adjusted, and the outdoor fan 4 runs at the existing rotating speed.
When the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is smaller than the minimum value in the standard temperature difference range, the air outlet temperature is lower than the air inlet temperature, cold wind feeling is easily generated, and discomfort of a user of the air conditioner is caused; in order to improve the air outlet temperature of the air conditioner, the rotating speed of the outdoor fan 4 is subjected to speed reduction treatment according to the numerical value of the air inlet and outlet temperature difference delta T of the indoor unit, so that the heat release quantity of the outdoor heat exchanger 6 is reduced, the heat release quantity of the second indoor heat exchanger 23 is increased, namely the heating quantity of the second indoor heat exchanger 23 to the dehumidified air is increased, and the purpose of improving the air outlet temperature of the air conditioner is achieved.
When the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is not less than the maximum value in the standard temperature difference range, the air outlet temperature is higher than the air inlet temperature, so that the indoor temperature is increased and the requirement of a user on the indoor temperature is not met; in order to reduce the air outlet temperature of the air conditioner, the rotating speed of the outdoor fan 4 is accelerated according to the value of the air inlet and outlet temperature difference delta T of the indoor unit, so that the heat release quantity of the outdoor heat exchanger 6 is increased, the heat release quantity of the second indoor heat exchanger 23 is reduced, namely the heating quantity of the second indoor heat exchanger 23 to the dehumidified air is reduced, and the purpose of reducing the air outlet temperature of the air conditioner is achieved.
According to the control method of the air conditioner, the air inlet and outlet temperature difference delta T of the indoor unit is compared with the standard temperature difference range, the rotating speed of the outdoor fan is adjusted according to the comparison result, and then the heat release quantity of the second indoor heat exchanger is adjusted, so that the purpose of adjusting the air outlet temperature of the indoor unit is achieved, and the indoor temperature is stable.
When the rotating speed of the outdoor fan 4 is reduced according to the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner, the speed reduction value of the outdoor fan 4 is determined according to the difference value between the air inlet and outlet temperature difference delta T of the indoor unit and the minimum value in the standard temperature difference range, and the larger the difference value between the air inlet and outlet temperature difference delta T of the indoor unit and the minimum value in the standard temperature difference range is, the larger the speed reduction value is.
The speed reduction processing of the rotating speed of the outdoor fan 4 according to the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner specifically comprises the following steps:
judging the temperature difference range of the inlet and outlet air temperature difference delta T of the indoor unit;
if the air inlet and outlet temperature difference delta T of the indoor unit is in the range of minus 2 to minus 0.5, the rotating speed of the outdoor fan 4 is reduced by 100 rpm;
if the air inlet and outlet temperature difference delta T of the indoor unit is in the range of minus 4 to minus 2 ℃, the rotating speed of the outdoor fan 4 is reduced by 200 rpm;
if the air inlet and outlet temperature difference delta T of the indoor unit is in the range of minus 6 to minus 4 ℃, the rotating speed of the outdoor fan 4 is reduced by 300 rpm;
if the temperature difference delta T of the air inlet and outlet of the indoor unit is less than-6 ℃, the rotating speed of the outdoor fan 4 is reduced by 400 rpm.
When the rotating speed of the outdoor fan is adjusted, in order to improve the running stability of the air conditioning system, after the rotating speed of the outdoor fan is adjusted each time, the next rotating speed adjustment is carried out after a preset time delay; the preset time is preferably 5 min.
And (4) adjusting the rotating speed of the outdoor fan 4 according to the method until the air inlet and outlet temperature difference delta T of the indoor unit is within the standard temperature difference range, and finishing the adjustment.
Similar to the process of performing speed reduction processing on the rotating speed of the outdoor fan 4 according to the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner, the speed reduction processing on the rotating speed of the outdoor fan 4 according to the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner provided by the invention specifically comprises the following steps:
judging the temperature difference range of the inlet and outlet air temperature difference delta T of the indoor unit;
if the air inlet and outlet temperature difference delta T of the indoor unit is in the range of 0.5,2) DEG C, increasing the rotating speed of the outdoor fan 4 by 100 rpm;
if the air inlet and outlet temperature difference delta T of the indoor unit is in the range of [2,4) ° C, increasing the rotating speed of the outdoor fan 4 by 200 rpm;
if the air inlet and outlet temperature difference delta T of the indoor unit is in the range of [4,6 ] DEG C, increasing the rotating speed of the outdoor fan 4 by 300 rpm;
if the air inlet and outlet temperature difference delta T of the indoor unit is more than or equal to 6 ℃, the rotating speed of the outdoor fan 4 is increased by 400 rpm.
And (4) adjusting the rotating speed of the outdoor fan 4 according to the method until the air inlet and outlet temperature difference delta T of the indoor unit is within the standard temperature difference range, and finishing the adjustment.
In order to maintain the stability of the outlet air temperature of the indoor unit, if the inlet and outlet air temperature difference Δ T of the indoor unit of the air conditioner is not less than the maximum value in the standard temperature difference range, before the speed increasing process is performed on the rotating speed of the outdoor fan 4 according to the inlet and outlet air temperature difference Δ T of the indoor unit of the air conditioner, the method further includes:
s4461: judging whether the rotating speed of the outdoor fan 4 is the highest rotating speed or not; if the rotating speed of the outdoor fan 4 is the highest rotating speed, the step S4462 is executed, otherwise, the step S447 is executed;
s4462: acquiring a first operation time length of the outdoor fan 4 in the highest rotation speed operation;
s4463: judging whether the first operation time length reaches a first preset operation time length or not; if the first operation duration reaches the first preset operation duration, the step S4464 is executed, otherwise, the step S4462 is executed;
s4464: judging whether the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is not less than the maximum value in the standard temperature difference range or not; if the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is not smaller than the maximum value in the standard temperature difference range, the step S4465 is executed, otherwise, the step S443 is executed;
s4465: and controlling the operation of the second electronic expansion valve 22 according to the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner.
When the rotating speed of the outdoor fan 4 is the highest rotating speed and the operation duration reaches the first preset operation duration, the heat release capacity of the outdoor heat exchanger 6 is adjusted to the maximum through the outdoor fan 4, the heat release capacity of the second indoor heat exchanger 23 is the minimum, and the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is not smaller than the maximum value in the standard temperature difference range, so that the heat release quantity of the second indoor heat exchanger 23 is still too high, and the heat release quantity of the second indoor heat exchanger 23 needs to be further adjusted through the second electronic expansion valve 22 to maintain the indoor temperature to be stable.
According to the control method of the air conditioner, after the rotating speed of the outdoor fan is adjusted to the highest rotating speed, if the indoor air outlet temperature is still high, the heat release quantity of the second indoor heat exchanger is further adjusted through the second electronic expansion valve, and the purpose of maintaining the indoor temperature stable is achieved.
Specifically, as shown in fig. 5, the controlling the operation of the second electronic expansion valve 22 according to the air inlet/outlet temperature difference Δ T of the indoor unit of the air conditioner includes:
s001: comparing the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner with a standard temperature difference range;
s002: judging whether the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is within a standard temperature difference range or not; if the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is within the standard temperature difference range, the step S003 is carried out, otherwise, the step S004 is carried out;
s003: the second electronic expansion valve 22 operates at the existing opening degree;
s004: judging whether the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is smaller than the minimum value in the standard temperature difference range or not; if the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is smaller than the minimum value in the standard temperature difference range, the step S005 is executed, otherwise, the step S006 is executed;
s005: increasing the opening degree of the second electronic expansion valve 22 according to the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner;
s006: judging whether the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is not smaller than the maximum value in the standard temperature difference range, if the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is not smaller than the maximum value in the standard temperature difference range, entering a step S007, otherwise, entering a step S001;
s007: the opening degree of the second electronic expansion valve 22 is reduced according to the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner.
The specific value of the standard temperature difference range is determined according to the requirements of customers, and for convenience of description, the preferable standard temperature difference range is the same as the standard temperature difference range in the operation process of controlling the outdoor fan 4 according to the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner, namely the standard temperature difference range is [ -0.5, 0.5) ° C; when the temperature difference Δ T between the inlet air and the outlet air is within the standard temperature difference range, the difference between the outlet air temperature and the inlet air temperature of the air conditioner is small, it is determined that the outlet air of the air conditioner does not cause discomfort to a user of the air conditioner at the moment, the heat exchange condition of the heat exchanger does not need to be adjusted, and the second electronic expansion valve 22 operates at the existing opening.
When the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is smaller than the minimum value in the standard temperature difference range, the air outlet temperature is lower than the air inlet temperature, cold wind feeling is easily generated, and discomfort of a user of the air conditioner is caused; in order to increase the outlet air temperature of the air conditioner, the opening of the second electronic expansion valve 22 is increased according to the value of the inlet and outlet air temperature difference delta T of the indoor unit, so as to increase the heat release of the second indoor heat exchanger 23, namely, the heating quantity of the second indoor heat exchanger 23 to the dehumidified air, thereby achieving the purpose of increasing the outlet air temperature of the air conditioner.
When the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is not less than the maximum value in the standard temperature difference range, the air outlet temperature is higher than the air inlet temperature, so that the indoor temperature is increased and the requirement of a user on the indoor temperature is not met; in order to reduce the outlet air temperature of the air conditioner, the opening degree of the second electronic expansion valve 22 is reduced according to the value of the inlet and outlet air temperature difference delta T of the indoor unit, so that the heat release quantity of the second indoor heat exchanger 23 is reduced, namely the heating quantity of the second indoor heat exchanger 23 to the dehumidified air is reduced, and the purpose of reducing the outlet air temperature of the air conditioner is achieved.
According to the control method of the air conditioner, the air inlet and outlet temperature difference delta T of the indoor unit is compared with the standard temperature difference range, the opening degree of the second electronic expansion valve is adjusted according to the comparison result, and then the heat release quantity of the second indoor heat exchanger is adjusted, so that the purpose of adjusting the air outlet temperature of the indoor unit is achieved, and the indoor temperature is stable.
When the opening degree of the second electronic expansion valve 23 is increased according to the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner, the value of the increase of the opening degree of the second electronic expansion valve 23 is determined according to the difference value between the air inlet and outlet temperature difference delta T of the indoor unit and the minimum value in the standard temperature difference range, and the larger the difference value between the air inlet and outlet temperature difference delta T of the indoor unit and the minimum value in the standard temperature difference range is, the larger the value of the increase of the opening degree is.
The method for adjusting the opening degree of the second electronic expansion valve 23 according to the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner specifically comprises the following steps:
judging the temperature difference range of the inlet and outlet air temperature difference delta T of the indoor unit;
if the temperature difference delta T of the inlet air and the outlet air of the indoor unit is in the range of minus 2 to minus 0.5, the opening degree of the second electronic expansion valve 23 is increased by 10 PLS;
if the temperature difference delta T of the inlet air and the outlet air of the indoor unit is in the range of minus 4 to minus 2 ℃, the opening degree of the second electronic expansion valve 23 is increased by 20 PLS;
if the temperature difference delta T of the inlet air and the outlet air of the indoor unit is in the range of minus 6 to minus 4 ℃, the opening degree of the second electronic expansion valve 23 is increased by 30 PLS;
and if the air inlet and outlet temperature difference delta T of the indoor unit is less than-6 ℃, increasing the opening degree of the second electronic expansion valve 23 by 50 PLS.
When the opening degree of the second electronic expansion valve 23 is adjusted, in order to improve the operation stability of the air conditioning system, after the rotating speed of the outdoor fan is adjusted each time, the next rotating speed adjustment is performed after a preset time delay; the preset time is preferably 5 min.
And (4) adjusting the opening degree of the second electronic expansion valve 23 according to the method until the air inlet and outlet temperature difference delta T of the indoor unit is within the standard temperature difference range, and finishing the adjustment.
Similar to the process of adjusting the opening degree of the second electronic expansion valve 23 according to the difference Δ T between the inlet air temperature and the outlet air temperature of the indoor unit of the air conditioner, the process of adjusting the opening degree of the second electronic expansion valve 23 according to the difference Δ T between the inlet air temperature and the outlet air temperature of the indoor unit of the air conditioner provided by the invention specifically comprises:
judging the temperature difference range of the inlet and outlet air temperature difference delta T of the indoor unit;
if the air inlet and outlet temperature difference delta T of the indoor unit is in the range of 0.5,2) DEG C, reducing the opening degree of the second electronic expansion valve 23 by 10 PLS;
if the air inlet and outlet temperature difference delta T of the indoor unit is in the range of [2,4) ° C, reducing the opening degree of the second electronic expansion valve 23 by 20 PLS;
if the air inlet and outlet temperature difference delta T of the indoor unit is in the range of [4,6) ° C, reducing the opening degree of the second electronic expansion valve 23 by 30 PLS;
and if the air inlet and outlet temperature difference delta T of the indoor unit is more than or equal to 6 ℃, reducing the opening degree of the second electronic expansion valve 23 by 50 PLS.
And (4) adjusting the opening degree of the second electronic expansion valve 22 according to the method until the air inlet and outlet temperature difference delta T of the indoor unit is within the standard temperature difference range, and finishing the adjustment.
In order to maintain the stability of the outlet air temperature of the indoor unit, if the inlet/outlet air temperature difference Δ T of the indoor unit of the air conditioner is smaller than the minimum value in the standard temperature difference range, before the opening of the second electronic expansion valve 22 is increased according to the inlet/outlet air temperature difference Δ T of the indoor unit of the air conditioner, the method further includes:
s0041: judging whether the opening degree of the second electronic expansion valve 22 is the maximum opening degree; if the opening degree of the second electronic expansion valve 22 is the maximum opening degree, the process proceeds to step S0042, otherwise, the process proceeds to step S005;
s0042: acquiring a second operation time length of the second electronic expansion valve 22 in the maximum opening operation;
s0043: judging whether the second operation time length reaches a second preset operation time length, if so, entering a step S0044, and otherwise, entering a step S0042;
s0044: judging whether the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is smaller than the minimum value in the standard temperature difference range or not; and (4) if the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is smaller than the minimum value in the standard temperature difference range, the step S44 is executed, otherwise, the step S003 is executed.
When the opening degree of the second electronic expansion valve 22 is the maximum opening degree and the operation duration reaches the second preset operation duration, the heat release capacity of the second indoor heat exchanger 23 is adjusted to the maximum through the second electronic expansion valve 22, and the temperature difference Δ T of the inlet air and the outlet air of the indoor unit of the air conditioner is smaller than the minimum value in the standard temperature difference range at this time, which proves that the heat release amount of the second indoor heat exchanger 23 is still too low at this time, and the heat release amount of the second indoor heat exchanger 23 needs to be further adjusted through the outdoor fan 4 to maintain the indoor temperature stable.
According to the control method of the air conditioner, after the opening degree of the second electronic expansion valve is adjusted to the maximum opening degree, if the indoor air outlet temperature is still low, the heat release quantity of the second indoor heat exchanger is further adjusted through the rotating speed of the outdoor fan, and the purpose of maintaining the indoor temperature stable is achieved.
Another objective of the present invention is to provide an air conditioner including the above air conditioner control device.
According to the air conditioner provided by the invention, the indoor heat exchanger is arranged into the two heat exchange units, and when the air conditioner operates in a dehumidification mode, the flow path of a refrigerant is changed, so that dehumidification is realized under the condition that the compressor does not shut down, the service life of the compressor is prolonged, and the energy consumption is reduced; meanwhile, the dehumidification capacity of the air conditioner is enhanced, and the dehumidification speed is increased.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (8)

1. A method of controlling an air conditioner, comprising:
acquiring an operation mode of the air conditioner;
if the operation mode is a refrigeration mode or a heating mode, controlling the opening and closing of a plurality of electromagnetic valves contained in a first heat exchange unit (1), a second heat exchange unit (2) and a communication unit (3) in an indoor heat exchanger so as to enable the first heat exchange unit (1) and the second heat exchange unit (2) to be connected in parallel;
if the operation mode is a dehumidification mode, controlling the opening and closing of a plurality of electromagnetic valves contained in the first heat exchange unit (1), the second heat exchange unit (2) and the communication unit (3) so as to enable the first heat exchange unit (1) and the second heat exchange unit (2) to be connected in series and open the opening degree of a second electronic expansion valve (22) of the second heat exchange unit (2) to the maximum opening degree; adjusting the rotating speed of the outdoor fan (4) to the highest rotating speed;
controlling the operation of the outdoor fan (4) according to the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner, and the method comprises the following steps:
acquiring a first operation time length of the outdoor fan (4) at the highest rotation speed;
if the first operation time length reaches a first preset operation time length, judging whether the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is not less than the maximum value in the standard temperature difference range;
and if the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is not smaller than the maximum value in the standard temperature difference range, controlling the operation of the second electronic expansion valve (22) according to the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner.
2. The control method of the air conditioner according to claim 1, wherein the communication unit (3) comprises a third electromagnetic valve (31), and a first communication pipeline (32) and a second communication pipeline (33) respectively connected to both ends of the third electromagnetic valve (31), wherein the first communication pipeline (32) is connected to the first heat exchange unit (1); and the second communication pipeline (33) is connected with the second heat exchange unit (2).
3. The control method of an air conditioner according to claim 2, wherein the first heat exchange unit (1) includes a first solenoid valve (11), a first electronic expansion valve (12), and a first indoor heat exchanger (13) connected in sequence by a pipe; the second heat exchange unit (2) comprises a second electronic expansion valve (22), a second indoor heat exchanger (23) and a second electromagnetic valve (21) which are connected in sequence through pipelines; the first communication pipeline (32) is connected with a pipeline between the first electromagnetic valve (11) and the first electronic expansion valve (12); the second communication pipeline (33) is connected with a pipeline between the second electromagnetic valve (21) and the second indoor heat exchanger (23).
4. The control method of an air conditioner according to claim 3, wherein said controlling the first heat exchange unit (1) to be connected in parallel with the second heat exchange unit (2) comprises: closing the third solenoid valve (31) and opening the first solenoid valve (11) and the second solenoid valve (21).
5. The control method of an air conditioner according to claim 3, wherein said controlling the first heat exchange unit (1) to be connected in series with the second heat exchange unit (2) comprises: opening the third solenoid valve (31), and closing the first solenoid valve (11), the second solenoid valve (21).
6. The control method of the air conditioner according to claim 1, wherein the controlling the operation of the outdoor fan (4) according to the indoor unit inlet and outlet air temperature difference Δ T of the air conditioner further comprises:
comparing the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner with a standard temperature difference range;
if the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is within the standard temperature difference range, the outdoor fan (4) runs at the existing rotating speed;
if the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is smaller than the minimum value in the standard temperature difference range, carrying out speed reduction processing on the rotating speed of the outdoor fan (4) according to the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner;
and if the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is not smaller than the maximum value in the standard temperature difference range, the rotating speed of the outdoor fan (4) is accelerated according to the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner.
7. The control method of the air conditioner according to claim 1, wherein the controlling the operation of the second electronic expansion valve (22) according to the inlet and outlet air temperature difference Δ T of the indoor unit of the air conditioner comprises:
comparing the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner with a standard temperature difference range;
if the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is within the standard temperature difference range, the second electronic expansion valve (22) operates at the existing opening degree;
if the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is smaller than the minimum value in the standard temperature difference range, the opening degree of the second electronic expansion valve (22) is increased according to the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner;
and if the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is not smaller than the maximum value in the standard temperature difference range, reducing the opening degree of the second electronic expansion valve (22) according to the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner.
8. The method for controlling an air conditioner according to claim 7, wherein if the difference Δ T between the inlet and outlet air temperatures of the indoor unit of the air conditioner is smaller than the minimum value in the standard temperature difference range, before the opening degree of the second electronic expansion valve (22) is increased according to the difference Δ T between the inlet and outlet air temperatures of the indoor unit of the air conditioner, the method further comprises:
judging whether the opening degree of the second electronic expansion valve (22) is the maximum opening degree or not;
if the opening degree of the second electronic expansion valve (22) is the maximum opening degree, acquiring a second operation time of the second electronic expansion valve (22) at the maximum opening degree;
if the second operation time length reaches a second preset operation time length, judging whether the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is smaller than the minimum value in the standard temperature difference range;
and if the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner is smaller than the minimum value in the standard temperature difference range, controlling the operation of the outdoor fan (4) according to the air inlet and outlet temperature difference delta T of the indoor unit of the air conditioner.
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