WO2022254825A1 - 空気調和機 - Google Patents
空気調和機 Download PDFInfo
- Publication number
- WO2022254825A1 WO2022254825A1 PCT/JP2022/007665 JP2022007665W WO2022254825A1 WO 2022254825 A1 WO2022254825 A1 WO 2022254825A1 JP 2022007665 W JP2022007665 W JP 2022007665W WO 2022254825 A1 WO2022254825 A1 WO 2022254825A1
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- Prior art keywords
- upper limit
- indoor
- unit
- limit frequency
- indoor unit
- Prior art date
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- 238000004140 cleaning Methods 0.000 claims abstract description 114
- 238000001816 cooling Methods 0.000 claims abstract description 52
- 239000003507 refrigerant Substances 0.000 claims abstract description 48
- 238000004378 air conditioning Methods 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims description 19
- 238000001704 evaporation Methods 0.000 claims description 12
- 230000008020 evaporation Effects 0.000 claims description 12
- 238000005406 washing Methods 0.000 claims description 6
- 206010034719 Personality change Diseases 0.000 claims description 2
- 238000000034 method Methods 0.000 description 13
- 230000008569 process Effects 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 238000007664 blowing Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 8
- 238000004891 communication Methods 0.000 description 7
- 238000009423 ventilation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 230000000284 resting effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Images
Classifications
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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
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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
- F24F11/70—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
-
- 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
- F24F11/79—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling the direction of the supplied air
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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
- F24F11/70—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
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/20—Humidity
Definitions
- the present disclosure relates to air conditioners.
- Patent Document 1 discloses an air conditioner capable of a cleaning operation in which an indoor heat exchanger functions as an evaporator and the indoor heat exchanger is cleaned with moisture condensed on the surface of the indoor heat exchanger.
- An object of the present disclosure is to provide an air conditioner that can shorten the time required for cleaning operation.
- An air conditioner indoor unit includes an outdoor unit including a compressor, an indoor unit connected to the outdoor unit via a refrigerant pipe, and including an indoor heat exchanger, and a controller.
- the control unit performs a cleaning operation including cleaning the indoor heat exchanger by causing the indoor heat exchanger to function as an evaporator, and a cooling operation in which air conditioning is performed by causing the indoor heat exchanger to function as an evaporator.
- a storage unit that stores an upper limit frequency of the compressor during the cooling operation, and operates the compressor at a frequency higher than the upper limit frequency during the cleaning operation.
- the compressor operates at a frequency higher than the upper limit frequency during cleaning operation, so that the necessary amount of water condenses or frosts on the surface of the indoor heat exchanger in a short time, shortening the time required for cleaning operation. can.
- a plurality of the indoor units including a first indoor unit and a second indoor unit are connected to the outdoor unit via the refrigerant pipe, and the control unit performs the cleaning operation or the cooling operation in each indoor unit.
- the control unit controls the frequency to be higher than the upper limit frequency. frequency to operate the compressor. As a result, the time required for the cleaning operation can be shortened even when the other indoor units in the multi-type air conditioner are in the cooling operation.
- the controller controls the amount of air blown out from the second indoor unit to be lower than the amount of air blown by the user. can also be reduced. This further lowers the temperature of the indoor heat exchanger of the first indoor unit, making it easier to secure the required amount of moisture earlier.
- the control unit supplies refrigerant from the outdoor unit to the indoor heat exchanger of the second indoor unit when the first indoor unit is in the cleaning operation and the second indoor unit is in the cooling operation.
- a threshold temperature of the indoor temperature at which supply is cut off may be higher than the threshold temperature when the cleaning operation is not performed in the first indoor unit. As a result, the temperature of the indoor heat exchanger of the first indoor unit is lowered, making it easier to secure the necessary amount of moisture earlier.
- the controller may operate the compressor at a frequency higher than the upper limit frequency during the cleaning operation when the humidity in the place where the indoor unit is installed is equal to or less than a predetermined value. As a result, when the humidity is low, it becomes easier to secure the amount of moisture that causes dew condensation or frost formation in the indoor heat exchanger.
- the control unit can further execute a heating operation in which air conditioning is performed by causing the indoor heat exchanger to function as a condenser, and after the cleaning operation in the indoor unit is completed, the location where the indoor unit is installed.
- the heating operation may be performed so that the room temperature is equal to or higher than the reference value. Thereby, it is possible to raise the room temperature that has been lowered by the cleaning operation.
- the evaporation temperature of the refrigerant during the cleaning operation may be lower than the evaporation temperature of the refrigerant during the cooling operation. This makes it easier to ensure the amount of moisture that condenses or frosts on the indoor heat exchanger.
- the indoor unit may include a flap capable of opening and closing an air outlet, and the control unit may set the flap to a horizontal position or a maximum air volume position during the cleaning operation. As a result, dripping of condensed water from the flap can be suppressed.
- the indoor unit includes a flap capable of opening and closing an air outlet, and the control unit may prohibit the flap from changing its posture during the cleaning operation. As a result, dripping of condensed water from the flap can be suppressed.
- the controller may operate the compressor at a frequency equal to or lower than the upper limit frequency during the cleaning operation of the indoor unit when the humidity in the location where the indoor unit is installed is equal to or higher than a predetermined value.
- the control unit may operate the compressor at a frequency equal to or lower than the upper limit frequency when the first indoor unit is in the cleaning operation and the second indoor unit is in the cooling operation. Thereby, the refrigerant noise can be reduced at the place where the second indoor unit is installed.
- the control unit stores one upper limit frequency candidate selected from the two or more upper limit frequency candidates in the storage unit as the upper limit frequency. let me As a result, an appropriate upper limit frequency can be selected from a plurality of upper limit frequency candidates.
- the storage unit stores one or more first-type upper-limit frequency candidates and one or more second-type upper-limit frequency candidates as the upper-limit frequency candidates, and the one or more first-type upper-limit frequency candidates.
- the control unit selects is stored in the storage unit as the upper limit frequency, and at the time of the cleaning operation, at a frequency higher than the upper limit frequency and equal to or lower than the minimum value among the one or more second type upper limit frequency candidates
- the compressor may be activated.
- the compressor frequency is set to be equal to or lower than all the upper limit frequency candidates for both types during cooling operation, and the compressor frequency is set to the minimum value of the first type upper limit frequency candidates during cleaning operation. , but less than or equal to the minimum value of the second type upper limit frequency candidates.
- FIG. 1 is a configuration diagram of a multi-type air conditioner according to an embodiment of the present disclosure
- FIG. FIG. 2 is an external view of the indoor unit shown in FIG. 1 as viewed obliquely from below
- FIG. 2 is a block diagram of the multi-type air conditioner shown in FIG. 1
- It is a flow chart of washing operation.
- FIG. 2 is a flow chart for explaining the operation of the multi-type air conditioner shown in FIG. 1 when there is a request for a cleaning operation in an indoor unit
- FIG. FIG. 2 is a flowchart for explaining the operation during cleaning operation at a frequency exceeding the upper limit frequency in the multi-type air conditioner shown in FIG. 1.
- FIG. FIG. 7 is a flowchart for explaining the operation of the multi-type air conditioner shown in FIG. 1 after the cleaning operation shown in FIG. 6 is finished.
- FIG. 1 shows a configuration diagram of a multi-type air conditioner 1 according to an embodiment of the present disclosure.
- the multi-type air conditioner 1 includes an outdoor unit 10 and three indoor units 20A, 20B, and 20C. It is connected to the outdoor unit 10 via piping.
- the indoor unit 20A has an A-room heat exchanger 24A and an A-room fan 25A.
- the indoor unit 20B has a B room heat exchanger 24B and a B room fan 25B.
- the indoor unit 20C has a C-room heat exchanger 24C and a C-room fan 25C.
- the number of indoor units is three, but the number of indoor units can be any number of two or more. Also, in the following description, the room in which the indoor unit 20A is installed is called room A, the room in which 20B is installed is called room B, and the room in which the indoor unit 20C is installed is called room C.
- the outdoor unit 10 includes a compressor 11, a four-way switching valve 12, an outdoor heat exchanger 13, an outdoor fan 15, an accumulator 16, and three electric expansion valves EVA, EVB, EVC.
- One of the four ports of the four-way switching valve 12 is connected to the discharge side of the compressor 11, another one is connected to one end of the outdoor heat exchanger 13, and another one is connected to one end of the accumulator 16, Yet another one is connected to one end of A-chamber heat exchanger 24A, B-chamber heat exchanger 24B and C-chamber heat exchanger 24C via three refrigerant pipe connections 18A, 18B, 18C.
- the other end of the outdoor heat exchanger 13 is connected to one ends of three electric expansion valves EVA, EVB and EVC.
- the other ends of the three electric expansion valves EVA, EVB, and EVC are connected to the A-compartment heat exchanger 24A, the B-compartment heat exchanger 24B, and the C-compartment heat exchanger 24A, 17B, and 17C, respectively, via three refrigerant pipe connections 17A, 17B, and 17C. connected to the other end of the device 24C.
- the other end of the accumulator 16 is connected to the suction side of the compressor 11 .
- An A-room fan 25A, a B-room fan 25B, and a C-room fan 25C are arranged near the A-room heat exchanger 24A, the B-room heat exchanger 24B, and the C-room heat exchanger 24C, respectively.
- the A room fan 25A is driven by an A room fan motor 26A (see FIG. 3).
- the B room fan 25B and the C room fan 25C are also driven by indoor fan motors (not shown).
- Compressor 11, four-way selector valve 12, outdoor heat exchanger 13, electric expansion valves EVA, EVB, EVC, A-chamber heat exchanger 24A, B-chamber heat exchanger 24B and C-chamber heat exchanger 24C , and an accumulator 16 are connected by refrigerant pipes to form a refrigerant circuit 3 .
- the refrigerant circuit 3 uses, for example, slightly flammable R32 as a refrigerant.
- a discharge pipe temperature sensor 31 is arranged on the discharge side of the compressor 11 .
- An outdoor heat exchanger temperature sensor 32 for detecting the outdoor heat exchanger temperature is arranged in the outdoor heat exchanger 13, and an outdoor temperature sensor 33 for detecting the outdoor temperature is arranged near the outdoor heat exchanger 13. are placed.
- An A-room heat exchanger temperature sensor 45A for detecting the indoor heat exchanger temperature is arranged in the A-room heat exchanger 24A, and an A-room temperature sensor 46A for detecting the indoor temperature is arranged near the A-room heat exchanger 24A. and an A room humidity sensor 47A for detecting indoor humidity.
- a B-room heat exchanger temperature sensor 45B for detecting the indoor heat exchanger temperature is arranged in the B-room heat exchanger 24B, and a B-room temperature sensor 46B for detecting the indoor temperature is arranged near the B-room heat exchanger 24B. and a room B humidity sensor 47B for detecting indoor humidity.
- a C-chamber heat exchanger temperature sensor 45C for detecting the indoor heat exchanger temperature is arranged in the C-chamber heat exchanger 24C.
- a sensor 46C and a C-chamber humidity sensor 47C for detecting the indoor humidity are arranged.
- FIG. 2 is a perspective view of the indoor unit 20A viewed obliquely from below.
- the indoor unit 20A is a ceiling cassette type (ceiling embedded type) indoor unit.
- the three indoor units 20A, 20B, and 20C are all ceiling cassette type indoor units, but some or all of them may be wall-mounted or floor-mounted indoor units.
- the indoor unit 20A includes a casing body 101, a rectangular panel 102 attached to the lower side of the casing body 101, and a grill 103 detachably attached to the panel 102.
- the surface of the panel 102 has light emitting diodes (LEDs), and the A room display unit 28A (see FIG. 3) is provided.
- LEDs light emitting diodes
- a blowout port 110 is provided along the short side of the panel 102 on one side in the longitudinal direction of the panel 102 .
- a flap 120 is attached to the panel 102 .
- the flap 120 is driven by the A-chamber flap drive motor 27A (see FIG. 3) to be rotatable relative to the panel 102 within a predetermined angular range, thereby opening and closing the outlet 110 .
- FIG. 3 shows a state where the outlet 110 is closed by the flap 120 .
- a drain socket 107 protrudes from the side wall of the casing body 101 .
- a drain hose (not shown) is connected to the drain socket 107 from the outside.
- pipe connection portions 105 and 106 protrude from side walls of the casing main body 101 .
- Refrigerant pipes (not shown) are connected to the pipe connection portions 105 and 106 from the outside.
- Suspension fittings 111 to 113 protrude laterally from the casing main body 101 .
- an electrical component section 108 is arranged near the casing main body 101 .
- FIG. 3 is a block diagram of the air conditioner 1 according to this embodiment. Since the three indoor units 20A, 20B, and 20C have the same structure in this embodiment, the indoor unit 20A will be mainly described here. Also, the illustration of the indoor units 20B and 20C is simplified in FIG.
- the outdoor unit 10 includes an outdoor control unit 51 comprising a microcomputer including an arithmetic device and a storage device, an input/output circuit, and the like.
- the indoor units 20A, 20B, and 20C respectively include indoor controllers 52A, 52B, and 52C each including a microcomputer including an arithmetic device and a storage device, an input/output circuit, and the like.
- the outdoor control unit 51 and the indoor control unit 52A are connected by a communication line LA
- the outdoor control unit 51 and the indoor control unit 52B are connected by a communication line LB
- the outdoor control unit 51 and the indoor control unit 52C are connected by a communication line LC.
- the outdoor controller 51 and the three indoor controllers 52A, 52B, and 52C communicate with each other via communication lines LA, LB, and LC, so that the outdoor controller 51 and the indoor controllers 52A, 52B, and 52C operate as multi-type air It operates as the control section 50 of the harmony machine 1 .
- Temperature detection signals from the discharge pipe temperature sensor 31, the outdoor heat exchanger temperature sensor 32, and the outdoor temperature sensor 33 are supplied to the outdoor control unit 51.
- the outdoor control unit 51 also controls the compressor 11, the four-way switching valve 12, the outdoor fan motor 14, the electric expansion valves EVA, EVB, EVC, and the like.
- Detection signals from the A-room heat exchanger temperature sensor 45A, the A-room temperature sensor 46A, and the A-room humidity sensor 47A are supplied to the indoor control unit 52A.
- the indoor control unit 52A also controls the A-room fan motor 26A, the A-room flap drive motor 27A, the A-room display unit 28A, the A-room communication unit 29A, and the like.
- the A-room communication unit 29A performs wireless communication with a user-operable remote controller (not shown) (hereinafter referred to as "remote controller").
- the control unit 50 controls the operation of the air conditioner 1 in response to commands from the remote controller.
- a remote controller which is a part of the air conditioner 1, has a liquid crystal display unit or a light emitting diode (LED), and can notify the user by means of light, characters, graphics, or the like.
- the remote controller may have a speaker that notifies the user by sound.
- the A-room display unit 28A and the speaker of the A-room remote control may be collectively referred to as a notification unit.
- a mobile terminal such as a smart phone in which an air conditioner control application is installed as a remote controller that is part of the air conditioner 1 . In this case, the mobile terminal can function as the notification unit.
- control unit 50 rotates the air conditioning operation including the cooling operation and the heating operation, the A room fan 25A, the B room fan 25B and the C room fan 25C in each indoor unit.
- a cleaning operation which will be described later, can be executed.
- the outdoor control unit 51 switches the four-way switching valve 12 to the position indicated by the dotted line in FIG. start driving. At this time, the outdoor control unit 51 opens the electric expansion valve EVA to a predetermined degree of opening, while closing the electric expansion valves EVB and EVC.
- the high-temperature and high-pressure gas refrigerant discharged from the compressor 11 is condensed by heat exchange with the outdoor air in the outdoor heat exchanger 13 functioning as a condenser by the outdoor control unit 51 rotating the outdoor fan 15. It becomes a liquid refrigerant.
- the liquid refrigerant from the outdoor heat exchanger 13 reaches the A-room heat exchanger 24A after being decompressed by the electric expansion valve EVA.
- the indoor control unit 52A operates the A-room fan 25A
- the decompressed liquid refrigerant evaporates by heat exchange with the indoor air in the A-room heat exchanger 24A functioning as an evaporator, and becomes a gaseous refrigerant.
- the indoor control unit 52A moves the flap 120 to the position where the air outlet 110 opens, so that the air cooled by the room A heat exchanger 24A is discharged from the air outlet 110.
- the outdoor control unit 51 switches the four-way switching valve 2 to the solid line position shown in FIG. At this time, the outdoor controller 51 opens all the electric expansion valves EVA, EVB, and EVC to predetermined opening degrees. Therefore, when the indoor unit 20A performs the heating operation, the high-temperature refrigerant also flows into the other indoor units 20B and 20C. This is to prevent the refrigerant from staying in the indoor units 20B and 20C that do not perform the heating operation and in the refrigerant pipes before and after them.
- the high-temperature and high-pressure gas refrigerant discharged from the compressor 11 is condensed by heat exchange with indoor air in the A-room heat exchanger 24A functioning as a condenser by the indoor controller 52A operating the A-room fan 25A. and becomes a liquid refrigerant.
- the refrigerant from the A-chamber heat exchanger 24A, the B-chamber heat exchanger 24B, and the C-chamber heat exchanger 24C reaches the outdoor heat exchanger 13 after being decompressed by the electric expansion valves EVA, EVB, and EVC. .
- the details of control of the outdoor unit 10 and the indoor units 20A, 20B, and 20C by the control unit 50 are changed by commands from the remote controller.
- the remote controller By operating the remote controller, the user can request the multi-type air conditioner 1 to select heating operation or cooling operation, start operation, stop operation, set room temperature and air volume, and start and stop cleaning operation.
- the remote control By operating the remote control, the user can select whether the air volume is set to a fixed mode or an automatic mode.
- the fixed mode the air volume is fixed at a level selected by the user from a plurality of levels (for example, three levels of "strong wind", "weak wind", and "light wind”).
- the automatic mode the optimum air volume is automatically selected from multiple stages according to the difference between the set temperature and the room temperature.
- the user can change the posture (position) of the flap 120 by operating the remote controller.
- the flap 120 is positioned to close the outlet 110 when the indoor unit is stopped. air volume position).
- the posture of the flap 120 of the indoor unit is fixed at the horizontal position or the maximum air volume position during cleaning operation, but can be changed by operating the remote controller during air conditioning operation.
- the outdoor control unit 51 includes a storage unit 51a.
- the storage unit 51a stores the upper limit frequency of the compressor 11 during cooling operation. For example, during the cooling operation of the indoor unit 20A, the frequency of the compressor 11 changes depending on the room temperature of room A, the outdoor temperature, the set temperature, and the air volume. During cooling operation, the control unit 50 does not operate the compressor 11 at a frequency exceeding the upper limit frequency stored in the storage unit 51a.
- control unit 50 selects one upper limit frequency candidate from a plurality of upper limit frequency candidates stored in the storage unit 51a, and sets the selected upper limit frequency candidate to It is stored in the storage unit 51a as the upper limit frequency.
- the first type upper limit frequency candidate is not related to product protection in this embodiment, and is, for example, a candidate for increasing the temperature of the indoor heat exchanger to a certain value or higher so as not to exceed the dew resistance of the indoor unit (The purpose is to prevent the moisture adhering to the indoor heat exchanger from being blown out of the indoor unit by the wind from the fan), and to suppress the noise generated when the refrigerant passes through the pipes (abnormal noise (to avoid noise), to suppress the generation of noise when there is a request from the user for noise (to avoid noise), and to keep the sound generated when the refrigerant passes through the piping at start-up constant from start-up There is one for suppressing it within the time (the purpose is to avoid abnormal noise at startup).
- the second type upper limit frequency candidate relates to product protection in this embodiment, for example, one for limiting the current current value to protect electrical equipment (the purpose is to protect electrical equipment), To limit the discharge pipe temperature and protect the compressor (to protect the compressor), to keep the ratio of high pressure and low pressure below a certain value (to protect the compressor), To ensure reliability at low rotation (to protect the compressor), to prevent the compressor pressure from deviating from the design pressure (to protect the compressor), current electrical components One that prevents the temperature from exceeding a specified value (for protection of electrical equipment), one that is proportional to the outdoor temperature (for protection of electrical equipment when current value cannot be protected, such as abnormal voltage), There are those to ensure the compressor reliability at startup (the purpose is to protect the compressor).
- Each upper limit frequency candidate may be a fixed value according to the capacity of the indoor unit, or may be a variable value calculated based on various conditions related to the air conditioner 1 .
- the control unit 50 When the upper limit frequency candidate is calculated by the control unit 50, the latest upper limit frequency candidate is overwritten and stored in the storage unit 51a.
- the upper limit frequency candidate is determined so as to be proportional to the outdoor temperature, the outdoor temperature is detected periodically, and the upper limit frequency candidate is calculated using the detected outdoor temperature as a parameter and overwritten in the storage unit 51a.
- the control unit 50 causes the storage unit 51a to store the minimum value among the one or more first type upper limit frequency candidates and the one or more second type upper limit frequency candidates as the upper limit frequency.
- the control unit 50 The minimum value among the upper limit frequency candidates is stored in the storage unit 51a as the upper limit frequency.
- the storage unit 51a stores the minimum value among one or more first-type upper-limit frequency candidates as the upper-limit frequency (one or more second-type upper-limit frequency candidates minimum value is greater than the upper limit frequency).
- the upper limit frequency stored in the storage unit 51a may be changed even during the cooling operation and the cleaning operation.
- the storage unit 51a stores permission information indicating permission or prohibition information indicating that the compressor 11 is permitted to operate at a frequency exceeding the upper limit frequency during the cleaning operation.
- the controller 50 can operate the compressor 11 at a frequency exceeding the upper limit frequency during cleaning operation.
- the prohibition information is stored, the controller 50 operates the compressor 11 only at a frequency equal to or lower than the upper limit frequency during the cleaning operation.
- the control unit 50 can change the permission information stored in the storage unit 51a to prohibition information and change the prohibition information to permission information based on the user's remote control operation.
- the controller 50 executes the evaporator phase of the cleaning operation in step S1. Specifically, the four-way switching valve 12 is switched to the position indicated by the dotted line in FIG. 1, and the operation of the compressor 11 is started.
- the controller 50 also drives the room A fan motor 26A to rotate the room A fan 25A at a predetermined number of revolutions, and drives the room A flap drive motor 27A to move the flap 120 to the position where the outlet 110 opens. . At this time, the flap 120 may be positioned at a position to close the outlet 110 .
- the control unit 50 opens the electric expansion valve EVA to a predetermined degree of opening, while closing the electric expansion valves EVB and EVC.
- the A-room heat exchanger 24A functions as an evaporator as in the cooling operation, and the evaporator phase of the cleaning operation starts.
- moisture in the air begins to condense on the surface of the A-compartment heat exchanger 24A. This condensed water can clean the dirt adhering to the surface of the A-chamber heat exchanger 24A.
- the temperature of the A-compartment heat exchanger 24A may be kept below the freezing point so that the surface of the A-compartment heat exchanger 24A is frosted with moisture in the air.
- the length of the evaporator phase is a predetermined time. The length of the evaporator phase is calculated by the control unit 50 from the environmental conditions (one or more of the indoor temperature and humidity of room A and the outdoor temperature). It may be the time until condensation or frost forms on the exchanger 24A. After the evaporator phase ends, the controller 50 stops the operation of the compressor 11 .
- a lower limit temperature (for example, 10° C.) is set for the room temperature at which the evaporator phase of the cleaning operation can be performed, and the control unit 50 does not start the evaporator phase when the room temperature is lower than the lower limit temperature. , abort the evaporator phase if it is running. This is because when the room temperature is very low, the amount of water vapor in the air is very small, and the amount of water that can adhere to the surface of the A-compartment heat exchanger 24A is also very small, so that a sufficient cleaning effect is exhibited. This is because it is considered impossible.
- a lower temperature limit is also set for the room temperature at which the cooling operation can be performed. In this embodiment, the lower limit temperature of the room temperature at which the evaporator phase of the cleaning operation can be performed is lower than the lower limit temperature of the room temperature at which the cooling operation can be performed.
- the evaporation temperature of the refrigerant in the evaporator phase of the cleaning operation is lower than the evaporation temperature of the refrigerant in the cooling operation.
- the lower limit value of the refrigerant evaporation temperature in the evaporator phase of the cleaning operation is lower than the lower limit value of the refrigerant evaporation temperature during the cooling operation.
- step S2 the controller 50 executes the blowing phase of the cleaning operation. Specifically, following step S1, the room A fan motor 26A is driven to rotate the room A fan 25A. Then, the position of the flap 120 is maintained at the same position as in step S1. Since the compressor 11 is stopped in the blowing phase, the temperature of the A-room heat exchanger 24A is higher than the temperature of the A-room heat exchanger 24A in the evaporator phase. The temperature of the A-compartment heat exchanger 24A usually exceeds the dew point temperature. By rotating the A room fan 25A, the evaporation of the moisture condensed on the A room heat exchanger 24A can be accelerated.
- the number of rotations of the A-room fan 25A and the blowing time are fixed at constant values. It should be noted that the compressor 11 does not have to be stopped if the temperature of the A-room heat exchanger 24A is higher than the temperature of the A-room heat exchanger 24A in the evaporator phase in the ventilation phase.
- the controller 50 executes the condenser phase of the cleaning operation. Specifically, the four-way switching valve 12 is switched to the solid line position shown in FIG. 1 to start the operation of the compressor 11 .
- the controller 50 drives the room A fan motor 26A to rotate the room A fan 25A at a predetermined number of revolutions, and maintains the position of the flap 120 at the same position as in step S1. .
- the controller 50 opens all the electric expansion valves EVA, EVB, and EVC to predetermined opening degrees.
- the room A heat exchanger 24A functions as a condenser as in the heating operation, and the condenser phase of the cleaning operation starts.
- the temperature of the A-compartment heat exchanger 24A is higher than the temperature of the A-compartment heat exchanger 24A in the ventilation phase. Therefore, the evaporation of moisture remaining on the surface of the A-compartment heat exchanger 24A can be further accelerated.
- the length of the condenser phase may be a predetermined amount of time.
- the controller 50 stops the compressor 11 and the A-chamber fan 25A, drives the A-chamber flap drive motor 27A, and moves the flap 120 to a position where the outlet 110 is closed. Note that the condenser phase can be omitted, for example, if the blowing phase of step S2 is made sufficiently long.
- step S11 the control unit 50 determines whether at least one of the indoor units 20B and 20C installed in the room B and the room C is in air conditioning operation. .
- the indoor unit 20A may be performing the air conditioning operation, or may not be performing any operation. In the following description, a case where the indoor units 20B and 20C are in cleaning operation or air blowing operation is omitted.
- step S12 the controller 50 determines whether at least one of the indoor units 20B and 20C is in heating operation.
- step S13 If this condition is satisfied (S12: YES), proceed to step S13.
- the indoor unit 20C is in a resting state and is not operated, and only the indoor unit 20B is in heating operation.
- the controller 50 continues the heating operation of the indoor unit 20B.
- the control unit 50 uses the notification unit of the indoor unit 20A of room A to notify the user by display or voice that "the cleaning operation cannot be performed due to conflict with another room.”
- step S12 If the condition of step S12 is not met (S12: NO), proceed to step S14.
- the control unit 50 determines which of the permitted information and the prohibited information is stored in the storage unit 51a. If the permission information is stored (S14: YES), the process proceeds to step S15.
- step S15 the controller 50 determines whether the humidity detected by the room A humidity sensor 47A is equal to or less than a predetermined value. If this condition is satisfied (S15: YES), the process proceeds to step S17.
- the controller 50 starts the cleaning operation in the indoor unit 20A.
- the frequency of the compressor 11 in the evaporator phase of the cleaning operation started in step S17 is higher than the upper limit frequency of the compressor 11 during the cooling operation stored in the storage unit 51a, and is one or more second type upper limits. It is equal to or less than the minimum value among the frequency candidates.
- the control unit 50 moves the flap 120 of the indoor unit 20A to the horizontal position or the maximum air volume position.
- the control unit 50 causes the storage unit 51a to store the room temperature detected by the room A temperature sensor 46A at this time. The control unit 50 continues the cooling operation performed by the indoor unit 20B without interruption.
- the cleaning operation in the indoor unit 20A sequentially shifts to the ventilation phase (S2) and the condenser phase (S3) described with reference to FIG. If the cooling operation of chamber B has not ended at the time when the condenser phase of the cleaning operation in the indoor unit 20A starts, one preset one is executed and the other is not executed.
- step S16 the controller 50 starts the cleaning operation in the indoor unit 20A.
- the frequency of the compressor 11 in the evaporator phase of the cleaning operation started in step S16 is equal to or lower than the upper limit frequency of the compressor 11 during the cooling operation stored in the storage unit 51a.
- the controller 50 moves the flap 120 of the indoor unit 20A to a predetermined position.
- the control unit 50 continues the cooling operation performed by the indoor unit 20B without interruption. Further, even when the condition of step S15 is not met (S15: NO), the process of step S16 is performed.
- step S11 If the condition of step S11 is not met (S11: NO), the process proceeds to step S14 without going through step S12.
- step S14 The following processing is the same as the case of proceeding to step S14 via step S12, except that the cooling operation of the indoor unit 20B is not continued.
- step S31 the control unit 50 determines whether the air volume setting in the indoor unit 20B is in the fixed mode or the automatic mode. If it is the fixed mode (S31: YES), the process proceeds to step S33. If it is the automatic mode (S31: NO), in step S32, the control unit 50 selects the optimum air volume stage (“strong wind”, “weak wind”) based on the set temperature and the room temperature detected by the room B temperature sensor 46B. , "breeze”). In step S33, the control unit 50 decreases the air volume in the fixed mode set in the indoor unit 20B by the user or the air volume in the automatic mode derived in step S32 by one level. In addition, when step S33 is executed for the second time or later in the flowchart of FIG. , the air volume is further reduced only when the air volume derived (S32) immediately before step S33 is smaller than the air volume derived before that.
- step S34 the controller 50 acquires the thermo-off temperature of the indoor unit 20B.
- the "thermo-off temperature” is the refrigerant from the outdoor unit 10 to the B room heat exchanger 24B of the indoor unit 20B when the indoor unit 20A is not in the cleaning operation and the indoor unit 20B is in the cooling operation. It means the threshold temperature of the indoor temperature at which the supply is cut off (the electric expansion valve EVB is closed).
- the thermo-off temperature may be a value lower than the set temperature by a predetermined temperature (for example, 1°C).
- the controller 50 determines whether or not the room temperature of the room B detected by the room B temperature sensor 46B is equal to or lower than the thermo-off temperature by a predetermined temperature (for example, 2° C.).
- step S35 the controller 50 closes the electric expansion valve EVB in step S36. If this condition is not met (S35: NO), the process proceeds to step S37 without going through step S36.
- step S37 the controller 50 determines whether the electric expansion valve EVB is closed. If closed (S37: YES), in step S38, the controller 50 determines whether the room temperature of the B room detected by the B room temperature sensor 46B is equal to or higher than the thermo-on temperature.
- the "thermo-on temperature” means the indoor temperature threshold temperature at which refrigerant supply from the outdoor unit 10 to the B-room heat exchanger 24B of the indoor unit 20B is started (the electric expansion valve EVB opens).
- the thermo-on temperature may be a value higher than the thermo-off temperature by a predetermined temperature (for example, 4° C.).
- step S38: YES If this condition is met (S38: YES), the controller 50 opens the electric expansion valve EVB in step S39. If this condition is not met (S38: NO), the process proceeds to step S40 without going through step S39. Further, when the electric expansion valve EVB is open in step S37 (S37: NO), the process also proceeds to step S40.
- step S40 the control unit 50 determines whether or not there is an instruction from the remote controller to change the attitude of the flap 120 of the indoor unit 20A. If there is an instruction (S40: YES), the process proceeds to step S41.
- step S41 the control unit 50 invalidates the attitude change instruction of the flap 120 received from the remote controller. More specifically, when the control unit 50 receives the posture change instruction and confirms that the indoor unit 20A at that time is in the cleaning operation and the storage unit 51a stores the permissible information, the posture change is performed. A drive command to the A chamber flap drive motor 27A motor is not output when the command is received.
- step S41 ends, the process returns to step S31. If there is no instruction to change the attitude of the flap 120 (S40: YES), the process returns to step S31 without going through step S41.
- the processing shown in FIG. 6 continues until the evaporator phase ends.
- the air volume of the indoor unit 20B which was reduced in step S33, is restored, and the threshold temperature (S35) of the room temperature for turning off the thermostat of the indoor unit 20B is returned to normal.
- the threshold temperature (S35) of the room temperature for turning off the thermostat of the indoor unit 20B is returned to normal.
- the evaporator phase ends and a predetermined time has passed, it becomes possible to change the attitude of the flap 120 of the indoor unit 20A.
- step S17 (Operation after completion of A room cleaning operation) Next, the operation of the multi-type air conditioner 1 according to this embodiment after the cleaning operation in step S17 is completed will be described with further reference to the flowchart of FIG.
- Each step below is executed by the control unit 50 . Although the processing described below is executed after the condenser phase of the cleaning operation ends, it may be started immediately after the evaporator phase ends or immediately after the ventilation phase ends.
- step S51 the control unit 50 repeatedly determines whether the cooling operation of the indoor unit 20B has ended until this condition is satisfied. If completed (S51: YES), the process proceeds to step S52.
- step S52 the control unit 50 determines whether the room temperature detected by the room A temperature sensor 46A at this point is lower than the room temperature of the room A stored in the storage unit 51a when the cleaning operation was started. If this condition is satisfied (S52: YES), the control unit 50 proceeds to step S53 and starts the heating operation of the indoor unit 20A.
- step S54 the control unit 50 determines whether the room temperature detected by the room A temperature sensor 46A at this time is equal to or higher than the room temperature of the room A stored in the storage unit 51a when the cleaning operation was started. Repeat until the decision is made. If this condition is satisfied (S54: YES), the control unit 50 proceeds to step S55 and ends the heating operation of the indoor unit 20A.
- the compressor 11 is operated at a frequency higher than the upper limit frequency during the cooling operation.
- the temperature of the A-room heat exchanger 24A of the indoor unit 20A during the cleaning operation can be significantly lower than the dew point temperature than when the unit 11 is operated. Therefore, the amount of water required for the cleaning operation is condensed or frosted on the A-compartment heat exchanger 24A in a short period of time, so the time required for the cleaning operation can be shortened. Also, in the multi-type air conditioner 1, the time required for the cleaning operation can be shortened even when the other indoor units are in the cooling operation.
- the amount of air blown out from the indoor unit 20B during the cleaning operation of the indoor unit 20A is made smaller than the amount of air directed by the user in the fixed mode and the amount of air derived in the automatic mode (S33).
- the temperature of the A-room heat exchanger 24A of the indoor unit 20A can be lowered more than when the air volume is not reduced. Therefore, it becomes easier to quickly secure the amount of water necessary for the cleaning operation in the A-room heat exchanger 24A of the indoor unit 20A. Further, it is possible to prevent the room temperature of the room B from excessively decreasing during the cleaning operation in the indoor unit 20A.
- the threshold temperature for closing the electric expansion valve EVB is set higher than the normal thermo-off temperature (S35), so the temperature in room A of the indoor unit 20A is higher than when the threshold temperature is the same as the normal thermo-off temperature.
- the temperature of the heat exchanger 24A can be lowered. Therefore, it becomes easier to secure the necessary amount of moisture in the A-room heat exchanger 24A of the indoor unit 20A at an early stage.
- the compressor frequency during the cleaning operation (S17) is set higher than the upper limit frequency during the cooling operation so that the heat of the room A is reduced. This makes it easier to ensure the amount of moisture that condenses or frosts on the exchanger 24A.
- the heating operation is performed so that the room temperature of the room A is equal to or higher than the room temperature at the start of the cleaning operation (S53, S54, S55). ), even if the compressor 11 is operated at a high frequency during the cleaning operation and the room temperature of the A room drops significantly, the room temperature can be recovered immediately.
- the evaporation temperature of the refrigerant during the cleaning operation is set lower than the evaporation temperature of the refrigerant during the cooling operation, condensation or frost forms on the A-room heat exchanger 24A during the cleaning operation of the indoor unit 20A. Makes it easier to keep hydrated.
- the flap 120 is set to the horizontal position or the maximum air volume position during the cleaning operation. Maintaining the flap 120 in a horizontal position makes it difficult for water droplets to fall from the flap 120 .
- the flap 120 is maintained at the maximum air volume position, the flow of air passing around the flap 120 is less likely to be disturbed, and even if the flap 120 is at a low temperature, water droplets are less likely to adhere.
- dripping of condensed water from the flap 120 can be suppressed.
- the cleaning The frequency of the compressor during operation (S16) is made equal to or lower than the upper limit frequency during cooling operation. In this way, when it is expected that the amount of water adhering to the A-compartment heat exchanger 24A can be ensured, refrigerant noise and dew splashing can be suppressed.
- the indoor unit 20A is in the cleaning operation and the indoor unit 20B is in the cooling operation, predetermined conditions such as prohibition of operation at frequencies exceeding the upper limit frequency are satisfied. Then, since the compressor 11 is operated at a frequency equal to or lower than the upper limit frequency (S14), the refrigerant noise can be reduced at the location where the indoor unit 20B is installed.
- an appropriate one (usually the minimum value) can be selected as the upper limit frequency from a plurality of upper limit frequency candidates.
- the compressor frequency can be set to be equal to or lower than both types of upper limit frequency candidates during cooling operation (S17).
- the compressor frequency exceeds the minimum value of the first type upper limit frequency candidate but is set to be equal to or less than the minimum value of the second upper limit frequency candidate, so that the time required for the cleaning operation can be shortened while protecting the product. .
- the air conditioner of the present disclosure has been described using a multi-type air conditioner as an example, but the air conditioner of the present disclosure is not only a multi-type, It can also be applied to a pair type connected by piping. In that case, in the embodiment described above, the determination and processing regarding the indoor units in other rooms may be omitted. In addition, the air conditioner of the present disclosure can also be applied to a multi-type air conditioner in which two or more indoor units perform the cleaning operation.
- the upper limit frequency is selected from a plurality of upper limit frequency candidates in this embodiment described above, the storage unit 51a may store one upper limit frequency instead of storing a plurality of upper limit frequency candidates.
- the operation when the cleaning operation in the indoor unit 20A shown in FIG. 5 is requested is executed from step S14, and steps S11, 12 and 13 are omitted good too. In that case, if the indoor unit 20B of room B is in heating operation, the heating operation is stopped in steps S16 and S17. As yet another modification, steps S14, 15 and 16 may be omitted.
- a predetermined temperature is stored in advance in the storage unit 51a.
- step S52 it is determined whether the room temperature detected by the room A temperature sensor 46A at this point is lower than the predetermined temperature stored in the storage unit 51a. It is repeatedly determined whether the room temperature detected by 46A is equal to or higher than the predetermined temperature stored in the storage unit 51a.
- the heating operation may be performed until the room temperature of the room A reaches a temperature higher than the room temperature at the end of the cleaning operation by a predetermined temperature instead of storing some temperature in the storage unit 51a. .
- step S52 is omitted, and in step S54, it is repeatedly determined whether or not the room temperature detected by the room A temperature sensor 46A at this time is equal to or higher than the room temperature at the end of the cleaning operation plus a predetermined temperature.
- step S54 it is also possible to appropriately combine the plurality of modified examples described above.
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Abstract
Description
以下、本開示の実施形態について図面を参照しつつ説明する。図1には、本開示の一実施形態に係るマルチ型空気調和機1の構成図が示されている。マルチ型空気調和機1は、図1に示すように、室外機10と、3つの室内機20A、20B、20Cとを含んでおり、各室内機20A、20B、20Cが、冷媒が通過する冷媒配管を介して室外機10に接続されている。室内機20Aは、A室熱交換器24A及びA室ファン25Aを有している。室内機20Bは、B室熱交換器24B及びB室ファン25Bを有している。室内機20Cは、C室熱交換器24C及びC室ファン25Cを有している。なお、本実施形態では、室内機を3台としているが、室内機の台数は2台以上の任意の数とすることができる。また、以下の説明において、室内機20Aが設置された部屋をA室、20Bが設置された部屋をB室、20Cが設置された部屋をC室と称することとする。
次に、マルチ型空気調和機1の制御系統について説明する。図3は、本実施形態に係る空気調和機1のブロック図である。なお、本実施形態において3台の室内機20A、20B、20Cは同じ構造を有しているため、ここでは室内機20Aを中心に説明することとする。また、図3において室内機20B、20Cの図示を簡略化している。
次に、本実施形態においてマルチ型空気調和機1が実行する洗浄運転の詳細について、図4をさらに参照しつつ説明する。なお、以下の説明は、すべての室内機が運転を停止した状態で1台の室内機20Aに対して洗浄運転が要求され、洗浄運転が終了するまで他の室内機20B、20Cに対して空調運転及び洗浄運転が要求されないことを前提としている。
次に、本実施形態に係るマルチ型空気調和機1において、A室に設置された室内機20Aでの洗浄運転が要求されたときの動作を、図5のフローチャートをさらに参照して説明する。以下の各ステップは制御部50によって実行される。
次に、本実施形態に係るマルチ型空気調和機1において、上限周波数を超える周波数で圧縮機11を作動させる洗浄運転の蒸発器フェーズ中における動作(S17)を、図6のフローチャートをさらに参照して説明する。以下の各ステップは制御部50によって実行される。なお、以下の説明ではステップS17の開始時に室内機20Bが冷房運転しているが、室内機20Cは冷房運転していないと仮定している。
次に、本実施形態に係るマルチ型空気調和機1において、ステップS17の洗浄運転が終了した後における動作を、図7のフローチャートをさらに参照して説明する。以下の各ステップは制御部50によって実行される。なお、以下で説明する処理は、洗浄運転の凝縮器フェーズの終了後に実行されるが、蒸発器フェーズの終了直後に開始してもよいし、送風フェーズの終了直後に開始してもよい。
上述のように、本実施形態では、所定の条件を満たした洗浄運転時(S17)に、冷房運転時の上限周波数よりも高い周波数で圧縮機11を作動させるので、上限周波数以下の周波数で圧縮機11を作動させた場合よりも、洗浄運転中の室内機20AのA室熱交換器24Aの温度を露点温度よりも大幅に低い温度とすることができる。そのため、洗浄運転に必要な量の水分が短時間でA室熱交換器24Aに結露又は着霜するので、洗浄運転に要する時間を短縮できる。また、マルチ型空気調和機1において他の室内機が冷房運転時にも、洗浄運転に要する時間を短縮できる。
上述した実施形態ではマルチ型空気調和機を例に本開示の空気調和機について説明したが、本開示の空気調和機はマルチ型だけでなく、1台の室外機と1台の室内機が冷媒配管で接続されたペア型にも適用できる。その場合、上述した実施形態において、他室の室内機に関する判断及び処理を省略すればよい。また、本開示の空気調和機は、マルチ型空気調和機において、2台以上の室内機において洗浄運転を実行する場合にも適用可能である。上述した本実施形態では複数の上限周波数候補から上限周波数が選択されたが、記憶部51aは複数の上限周波数候補を記憶せず、一の上限周波数を記憶するものであってもよい。
10 室外機
11 圧縮機
12 四路切換弁
13 室外熱交換器
16 アキュムレータ
17A、17B、17C 冷媒配管接続部
18A、18B、18C 冷媒配管接続部
20A、20B、20C 室内機
24A A室熱交換器
24B B室熱交換器
24C C室熱交換器
25A A室ファン
25B B室ファン
25C C室ファン
31 吐出管温度センサ
32 室外熱交換器温度センサ
33 室外温度センサ
45A A室熱交換器温度センサ
45B B室熱交換器温度センサ
45C C室熱交換器温度センサ
46A A室温度センサ
46B B室温度センサ
46C C室温度センサ
EVA、EVB、EVC 電動膨脹弁
Claims (14)
- 圧縮機(11)を含む室外機(10)と、
前記室外機(10)に冷媒配管を介して接続されており、室内熱交換器(24A)を含む室内機(20A)と、
制御部(50)とを備え、
前記制御部(50)は、
前記室内熱交換器(24A)を蒸発器として機能させて前記室内熱交換器(24A)を洗浄することを含む洗浄運転と、前記室内熱交換器(24A)を蒸発器として機能させて空調を行う冷房運転とを実行可能であり、
前記冷房運転時における前記圧縮機(11)の上限周波数を記憶する記憶部(51a)を含んでおり、
前記洗浄運転時には、前記上限周波数よりも高い周波数で前記圧縮機(11)を作動させる空気調和機(1)。 - 第1室内機(20A)及び第2室内機(20B)を含む複数の前記室内機(20A,20B,20C)が、前記冷媒配管を介して前記室外機(10)に接続されており、前記制御部(50)は、各室内機で前記洗浄運転又は前記冷房運転を実行可能である請求項1に記載の空気調和機(1)。
- 前記制御部(50)は、2台以上の前記室内機(20A,20B,20C)で前記洗浄運転中又は前記冷房運転中であり、そのうちの1台以上の前記室内機(20A)で前記洗浄運転中であるときに、前記上限周波数よりも高い周波数で前記圧縮機(11)を作動させる請求項2に記載の空気調和機(1)。
- 前記制御部(50)は、前記第1室内機(20A)で前記洗浄運転中であり前記第2室内機(20B)で前記冷房運転中であるときに、前記第2室内機(20B)から吹き出される風量をユーザに指示された風量よりも少なくする請求項2又は3に記載の空気調和機(1)。
- 前記制御部(50)は、前記第1室内機(20A)で前記洗浄運転中であり前記第2室内機(20B)で前記冷房運転中であるときにおける、前記室外機(10)から前記第2室内機(20B)の前記室内熱交換器(24B)への冷媒供給が遮断される室内温度の閾値温度を、前記第1室内機(20A)での前記洗浄運転が実行されていないときにおける前記閾値温度よりも高くする請求項2又は3の空気調和機(1)。
- 前記制御部(50)は、前記室内機(20A)が設置された場所の湿度が所定値以下であるときに、前記洗浄運転時に前記上限周波数よりも高い周波数で前記圧縮機(11)を作動させる請求項1~5のいずれか1項に記載の空気調和機(1)。
- 前記制御部(50)は、前記室内熱交換器(24A)を凝縮器として機能させて空調を行う暖房運転をさらに実行可能であり、
前記室内機(20A)での前記洗浄運転の終了後に、前記室内機(20A)が設置された場所の室温が基準値以上となるように前記暖房運転を実行する請求項1~6のいずれか1項に記載の空気調和機(1)。 - 前記洗浄運転時における冷媒の蒸発温度は、前記冷房運転時における冷媒の蒸発温度よりも低い請求項1~7のいずれか1項に記載の空気調和機(1)。
- 前記室内機(20A)は、空気の吹出口を開閉可能なフラップ(120)を含んでおり、
前記制御部(50)は、前記洗浄運転中に前記フラップ(120)を水平位置又は最大風量位置とする請求項1~8のいずれか1項に記載の空気調和機(1)。 - 前記室内機(20A)は、空気の吹出口を開閉可能なフラップ(120)を含んでおり、
前記制御部(50)は、前記洗浄運転中に前記フラップ(120)の姿勢変更を禁止する請求項1~9のいずれか1項に記載の空気調和機(1)。 - 前記制御部(50)は、前記室内機(20A)が設置された場所の湿度が所定値以上であるときに、当該室内機(20A)の前記洗浄運転時に前記上限周波数以下の周波数で圧縮機(11)を作動させる請求項1~10のいずれか1項に記載の空気調和機(1)。
- 前記制御部(50)は、前記第1室内機(20A)で前記洗浄運転中であり前記第2室内機(20B)で前記冷房運転中であるときに、所定条件が満たされると、前記上限周波数以下の周波数で前記圧縮機(11)を作動させる請求項2~5のいずれか1項に記載の空気調和機(1)。
- 前記記憶部(51a)が、2以上の上限周波数候補を記憶しているとき、前記制御部(50)は、前記2以上の上限周波数候補から選択された一の前記上限周波数候補を前記上限周波数として前記記憶部(51a)に記憶させる請求項1~12のいずれか1項に記載の空気調和機(1)。
- 前記記憶部(51a)が、前記上限周波数候補として、一以上の第1種の上限周波数候補と、一以上の第2種の上限周波数候補とを記憶しており、
前記一以上の第1種の上限周波数候補の中での最小値が、前記一以上の第2種の上限周波数候補の中での最小値よりも小さいとき、
前記制御部(50)は、
前記一以上の第1種の上限周波数候補の中での前記最小値を前記上限周波数として前記記憶部(51a)に記憶させ、
前記洗浄運転時には、前記上限周波数よりも高く、前記一以上の第2種の上限周波数候補の中での前記最小値以下の周波数で前記圧縮機(11)を作動させる請求項13に記載の空気調和機(1)。
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