WO2020059077A1 - 空気調和機及び制御方法 - Google Patents
空気調和機及び制御方法 Download PDFInfo
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- WO2020059077A1 WO2020059077A1 PCT/JP2018/034819 JP2018034819W WO2020059077A1 WO 2020059077 A1 WO2020059077 A1 WO 2020059077A1 JP 2018034819 W JP2018034819 W JP 2018034819W WO 2020059077 A1 WO2020059077 A1 WO 2020059077A1
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- WIPO (PCT)
- Prior art keywords
- indoor
- unit
- thermo
- indoor unit
- air conditioner
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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
- F24F11/70—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
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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
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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
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
- F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/029—Control issues
- F25B2313/0293—Control issues related to the indoor fan, e.g. controlling speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/031—Sensor arrangements
- F25B2313/0314—Temperature sensors near the indoor heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/09—Improving heat transfers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
- F25B2700/1931—Discharge pressures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
- F25B2700/1933—Suction pressures
Definitions
- the embodiment of the present invention relates to an air conditioner and a control method.
- One type of air conditioner is a multi-type air conditioner in which a plurality of indoor units are connected to one outdoor unit.
- the multi-type air conditioner can collectively perform air conditioning in a plurality of spaces by disposing a plurality of indoor units in a plurality of spaces.
- some of the indoor units are not performing the heating operation when the heating operation is being performed as a whole (hereinafter, referred to as “non-heating state”), and the non-heating state is set.
- a small amount of refrigerant may be circulating in the indoor unit.
- the indoor blower is driven in such a case, the refrigerant is condensed by heat exchange by discharging the warm air, and there is a possibility that a necessary amount of the gas refrigerant becomes insufficient.
- the problem to be solved by the present invention is to provide an air conditioner and a control method capable of suppressing hot air from being blown out from an indoor unit not performing a heating operation in a multi-type air conditioner during a heating operation. To provide.
- the air conditioner of the embodiment has one or a plurality of indoor units, one or a plurality of outdoor units, a thermo-off detection unit, and a control unit.
- One or more indoor units have an indoor expansion valve and an indoor blower.
- One or more outdoor units have a compressor.
- the thermo-off detector detects thermo-off of the one or more indoor units during the heating operation.
- the control unit operates the compressor and operates the indoor expansion valve or the indoor blower of the one or more indoor units. Are controlled based on the detection result of the thermo-off.
- FIG. 3 is a diagram illustrating a specific example of a functional configuration of a control unit 3 according to the embodiment.
- 9 is a flowchart showing a specific example of a process in which the control unit 3 controls the intermittent operation of the indoor blower 13 in the multi-type air conditioner 100 of the embodiment.
- 9 is a flowchart showing a specific example of a process in which the control unit 3 controls the intermittent operation of the indoor blower 13 in the multi-type air conditioner 100 of the embodiment.
- 9 is a flowchart showing a specific example of a process in which the control unit 3 controls the intermittent operation of the indoor blower 13 in the multi-type air conditioner 100 of the embodiment.
- FIG. 1 is a diagram illustrating a configuration example of a multi-type air conditioner 100 according to an embodiment.
- the multi-type air conditioner 100 of the embodiment includes, for example, a first indoor unit 1A, a second indoor unit 1B, and a third indoor unit 1C, which are four indoor units, and an outdoor unit 2; A control unit 3.
- the first indoor unit 1A, the second indoor unit 1B, and the third indoor unit 1C are connected to the outdoor unit 2 via a transfer pipe.
- the configuration of the first indoor unit 1A, the configuration of the second indoor unit 1B, and the configuration of the third indoor unit 1C are the same. Therefore, regarding the configuration of these three indoor units 1, the first indoor unit 1A will be described as an example, and the description of the second indoor unit 1B and the third indoor unit 1C will be omitted.
- each component of the first indoor unit 1A is identified by adding a letter “A” to a common code.
- each configuration of the second indoor unit 1B is identified by adding a letter “B” to a common code
- each configuration of the third indoor unit 1C is identified by adding a letter “C”.
- the common components are denoted by the same reference numerals without the letters “A”, “B”, and “C”. Expressed by
- the first indoor unit 1A includes an indoor heat exchanger 11A, an indoor expansion valve 12A, an indoor blower 13A, and a room temperature measuring device 14A.
- the indoor heat exchanger 11A is a device that realizes heat exchange between the refrigerant and indoor air.
- the indoor heat exchanger 11A is connected to the indoor expansion valve 12A by an indoor pipe.
- the indoor heat exchanger 11A is a fin tube type heat exchanger.
- the indoor expansion valve 12A is a device for expanding the refrigerant.
- the indoor expansion valve 12A is an electronic expansion valve (PMV: Pulse ⁇ Motor ⁇ Valve) whose opening degree can be changed.
- PMV Pulse ⁇ Motor ⁇ Valve
- the refrigerant becomes less likely to flow in the indoor expansion valve 12A.
- the indoor blower 13A is a blower for promoting heat exchange by the indoor heat exchanger 11A.
- the indoor blower 13A has a centrifugal fan.
- the fan of the indoor blower 13A is arranged so as to face the indoor heat exchanger 11A.
- the room temperature measuring device 14A is a device for measuring the room temperature near the indoor heat exchanger 11A.
- the room temperature measuring device 14A is communicably connected to the control unit 3, and transmits measurement data to the control unit 3.
- the outdoor unit 2 includes an outdoor heat exchanger 21, a four-way valve 22, a compressor 23, an outdoor expansion valve 24, an outdoor blower 25, a discharge pressure sensor 26, and a suction pressure sensor 27.
- the outdoor heat exchanger 21 is a device that realizes heat exchange between the refrigerant and outdoor air.
- the outdoor heat exchanger 21 is connected to a four-way valve 22 and an outdoor expansion valve 24 by an outdoor pipe.
- the outdoor heat exchanger 21 is a fin tube type heat exchanger.
- the four-way valve 22 is a device that switches the circulation path of the refrigerant inside the multi-type air conditioner 100. Specifically, the four-way valve 22 switches the circulation path of the refrigerant between a heating operation path and a cooling operation or a defrosting operation path. For example, FIG. 1 shows a situation where the four-way valve 22 has switched the refrigerant circulation path to a heating operation path.
- the four-way valve 22 is connected to the indoor heat exchanger 11, the compressor 23, and the outdoor heat exchanger 21 by an outdoor pipe.
- the compressor 23 is a device that compresses the refrigerant supplied from the first indoor unit 1A, the second indoor unit 1B, or the third indoor unit 1C.
- the compressor 23 compresses the refrigerant sucked from the suction port SP, and discharges the compressed refrigerant from the discharge port DP.
- the refrigerant compressed by the compressor 23 is sent to the indoor heat exchanger 11 or the outdoor heat exchanger 21 by the four-way valve 22.
- an accumulator 231 for storing a liquid refrigerant is attached to a suction port SP of the compressor 23.
- the outdoor expansion valve 24 is a device for expanding the refrigerant.
- the outdoor expansion valve 24 may be an electronic expansion valve (PMV) similar to the indoor expansion valve 12A.
- the outdoor expansion valve 24 is connected to the outdoor heat exchanger 21 and the indoor expansion valve 12 by an outdoor pipe.
- the outdoor blower 25 is a blower for promoting heat exchange by the outdoor heat exchanger 21.
- the outdoor blower 25 has a centrifugal fan similar to the indoor blower 13, and is arranged to face the outdoor heat exchanger 21.
- the discharge pressure sensor 26 is a device that measures the pressure of the refrigerant discharged from the compressor 23 (hereinafter, referred to as “discharge pressure”). Specifically, the discharge pressure sensor 26 measures the discharge pressure of the refrigerant at the discharge port DP of the compressor 23. The discharge pressure sensor 26 is communicably connected to the control unit 3 and transmits measurement data to the control unit 3.
- the suction pressure sensor 27 is a device that measures the pressure of the refrigerant sucked into the compressor 23 (hereinafter referred to as “suction pressure”). Specifically, the suction pressure sensor 27 detects the suction pressure of the refrigerant at the suction port SP of the compressor 23.
- the suction pressure sensor 27 is communicably connected to the control unit 3 and transmits measurement data to the control unit 3.
- the control unit 3 has a function of controlling operations of the first indoor unit 1A, the second indoor unit 1B, the third indoor unit 1C, and the outdoor unit 2.
- the control unit 3 includes a CPU (Central Processing Unit), a memory, and an auxiliary storage device connected by a bus, and executes a program.
- the control unit 3 functions as a functional unit including a first control unit 31, a thermo-off detection unit 32, and a second control unit 33, which will be described later, by executing a program, and communicates via a bus to the first indoor unit 1A and the second indoor unit 1A.
- the operation of the unit 1B, the third indoor unit 1C, and the outdoor unit 2 is controlled.
- control unit 3 may be realized using hardware such as an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array).
- the program may be recorded on a computer-readable recording medium.
- the computer-readable recording medium is, for example, a portable medium such as a flexible disk, a magneto-optical disk, a ROM, a CD-ROM, or a storage device such as a hard disk built in a computer system.
- the program may be transmitted via a telecommunication line.
- FIG. 2 is a diagram illustrating a specific example of a functional configuration of the control unit 3 in the embodiment.
- the control unit 3 includes a first control unit 31, a thermo-off detection unit 32, and a second control unit 33.
- the first control unit 31 has a function of controlling a normal air-conditioning operation by the first indoor unit 1A, the second indoor unit 1B, the third indoor unit 1C, and the outdoor unit 2 (hereinafter, referred to as “normal control function”).
- the normal air conditioning operation here means operations such as heating, cooling, air blowing, and defrosting provided by the conventional air conditioner.
- a function of stopping the indoor unit 1 that has reached the limit Generally, stopping or stopping the indoor unit 1 whose room temperature has reached the set temperature during the heating operation is referred to as “thermo-off”.
- the thermo-off detector 32 detects the first indoor unit 1A and the second indoor unit based on the discharge pressure of the compressor 23 measured by the discharge pressure sensor 26 and the suction pressure of the compressor 23 measured by the suction pressure sensor 27. It has a function of detecting the thermo-off of the unit 1B and the third indoor unit 1C. The thermo-off detector 32 notifies the first controller 31 and the second controller 33 of the detection result. Alternatively, the thermo-off may be detected when the room temperature measured by the room temperature measuring device 14 reaches the set temperature.
- the second control unit 33 has a function of controlling the blowing operation of the indoor unit 1 in the multi-type air conditioner 100 performing the heating operation as a whole. Specifically, the second control unit 33 controls the operation of the indoor expansion valve 12, the indoor blower 13, and the compressor 23 of each indoor unit 1 based on the detection result of the thermo-off for each indoor unit 1.
- FIGS. 3, 4, and 5 are flowcharts illustrating a specific example of a process in which the control unit 3 controls the intermittent operation of the indoor blower 13 in the multi-type air conditioner 100 according to the embodiment.
- the first control unit 31 causes the first indoor unit 1A, the second indoor unit 1B, the third indoor unit 1C, and the outdoor unit 2 to start heating operation (step S101), and thereafter, any one of the indoor units 1 It is assumed that the setting of the blowing operation is performed for. Here, it is assumed that the setting of the blowing operation has been performed on the third indoor unit 1C (step S102). Note that even if the cooling operation is set in step S102, the indoor fan performs the blowing operation.
- the second control unit 33 determines whether or not the blowing operation during the heating operation is permitted for the third indoor unit 1C (Step S103).
- the second control unit 33 opens the indoor expansion valve 12C of the third indoor unit 1C by a small amount.
- the indoor blower 13C is stopped (step S105: OFF).
- the second control unit 33 closes the indoor expansion valve 12C of the third indoor unit 1C (step S103).
- the indoor blower 13C is operated (step S107: ON).
- step S106 The reason why the indoor expansion valve 12C is closed in step S106 is to suppress the blowing of warm air from the third indoor unit 1C due to the operation of the indoor blower 13C. However, when the warm air is allowed to be blown out during the blowing operation, the indoor expansion valve 12C does not necessarily have to be closed.
- the second control unit 33 previously stores information indicating permission or non-permission of the blowing operation for the third indoor unit 1C, and determines whether the blowing operation is permitted by referring to the information. May be.
- thermo-off detection unit 32 determines whether or not the first indoor unit 1A is in the thermo-off state (Step S108). Specifically, the thermo-off detection unit 32 determines the presence or absence of thermo-off based on the suction pressure and the discharge pressure of the compressor 23. When it is determined that the first indoor unit 1A is in the thermo-off state (step S108-YES), the thermo-off detection unit 32 determines whether the second indoor unit 1B is in the thermo-off state (step S109).
- the second control unit 33 stops the compressor 23 (step S110: OFF) and turns off the indoor expansion valve 12A.
- step S111 the indoor blower 13A is caused to execute an intermittent blowing operation (step S112: intermittent operation).
- step S113 the second control unit 33 causes the indoor blower 13B to intermittently perform a blowing operation (Step S114: intermittent operation).
- the operation of operating the indoor blower 13 at 300 rpm for 1 minute and then stopping for 1 minute is repeated.
- step S109-NO when it is determined in step S109 that the second indoor unit 1B is not in the thermo-off state (step S109-NO), the second control unit 33 operates the compressor 23 (step S115: ON), and the indoor expansion is performed. After opening the valve 12B by a minute amount (step S116: minute opening), the indoor blower 13A is caused to execute an intermittent blowing operation (step S117: intermittent operation). Subsequently, the first control unit 31 controls the indoor expansion valve 12B and the indoor blower 13B by the normal control function (Steps S118, S119).
- the compressor 23 is not stopped and the indoor expansion valve 12A is set to a small amount (for example, 30).
- the indoor expansion valve 12A is set to a small amount (for example, 30).
- the intermittent operation of the indoor blower 13A is performed.
- the second indoor unit 1B is controlled in the same manner as in the normal state.
- step S108-NO if it is determined in step S108 that the first indoor unit 1A is not in the thermo-off state (step S108-NO), the second control unit 33 operates the compressor 23 (step S120), and The control unit 31 controls the indoor expansion valve 12A and the indoor blower 13A by the normal control function (Steps S121 and S122).
- thermo-off detection unit 32 determines whether or not the second indoor unit 1B is in the thermo-off state (Step S123).
- the second control unit 33 opens the indoor expansion valve 12B by a minute amount (step S124: minutely open).
- the indoor blower 13B is caused to perform an intermittent blowing operation (step S125: intermittent operation).
- the compressor 23 is not stopped, and the first indoor unit 1A is in the same state as the normal state. Is controlled.
- the intermittent operation of the indoor blower 13B is performed in a state where the indoor expansion valve 12B is opened by a minute amount (for example, 30 pulses).
- step S123 when it is determined in step S123 that the second indoor unit 1B is not in the thermo-off state (step S123-NO), the first control unit 31 controls the indoor expansion valve 12B and the indoor blower 13B by the normal control function ( Steps S126 and S127).
- first indoor unit 1A and the second indoor unit 1B are not in the thermo-off state by the processing up to this point, the compressor 23 is not stopped, and the first indoor unit 1A and the second indoor unit 1B are the same as in the normal state. Is controlled.
- the second control unit 33 determines whether all the indoor units 1 are in the non-heating state (step S128), and when it is determined that any of the indoor units 1 is not in the non-heating state. The process returns to step S103 (NO in step S128), and ends if it is determined that all the indoor units 1 are in the non-heating state.
- the multi-type air conditioner 100 of the embodiment configured as described above intermittently operates the indoor blower 13 according to the thermo-off state of the indoor unit 1, so that the temperature of the indoor unit 1 in the non-heating state during the heating operation is increased.
- the blowing of wind can be suppressed.
- a multi-type air conditioner can collectively perform air conditioning in a plurality of spaces by disposing a plurality of indoor units in a plurality of spaces.
- not all the connected indoor units are always operating. For example, some indoor units may have stopped operating due to a user operation or may have been temporarily stopped due to thermo-off. In this case, it is not necessary to circulate the refrigerant in the indoor unit that is in the non-heating state or the thermo-off state. However, in a non-heating state or a thermo-off state during the heating operation, a very small amount of refrigerant may be circulated through the indoor unit in order to suppress the occurrence of a problem due to liquid accumulation.
- air conditioners generally have a room temperature sensor.
- the air conditioner can control the space to be air-conditioned to a comfortable temperature by controlling the respective constituent elements based on the room temperature.
- the indoor air is taken into the indoor unit to reduce the room temperature. May be detected. Therefore, even in the indoor unit in the thermo-off state, the indoor blower is often driven at the time of measuring the room temperature.
- an indoor blower may be simultaneously driven in a plurality of indoor units in a thermo-off state.
- a minute amount of refrigerant may be circulating in the plurality of indoor units in the thermo-off state for the above-described reason and the like.
- the indoor blower when the indoor blower is driven, the refrigerant is condensed.
- the number of rotations of the indoor blower is large and the air volume is large, or when a large amount of refrigerant is flowing, the amount of condensed refrigerant increases, causing a sudden drop in pressure or Insufficient refrigerant is likely to occur.
- a cooling operation or a blowing operation may be set in another indoor unit.
- the flow of the refrigerant differs between the cooling operation and the heating operation, the cooling operation and the heating operation cannot be performed simultaneously even if such settings are made.
- the cooling operation or the blowing operation when performing the heating operation as a whole, the cooling operation or the blowing operation may be set in the indoor unit that is not performing the heating operation, and in such a case, A minute amount of refrigerant may be circulated to these indoor units.
- the indoor blower when the indoor blower is driven in the indoor units, the amount of refrigerant condensed in the indoor units increases, and there is a possibility that the shortage of the refrigerant is likely to occur.
- thermo-off detection unit that detects a thermo-off of the one or more indoor units during a heating operation, and an indoor unit that does not perform a heating operation in the one or more indoor units. Having a control unit that controls the operation of the compressor and the operation of the indoor expansion valve or the indoor blower of the one or more indoor units based on the result of the detection of the thermo-off when the compressor is present. Thereby, in the multi-type air conditioner during the heating operation, it is possible to suppress the hot air from being blown out from the indoor unit that is not performing the heating operation.
- the number of the indoor units 1 provided in the multi-type air conditioner 100 may be one or more, and need not necessarily be three.
- the number of the outdoor units 2 included in the multi-type air conditioner 100 may be two or more, and need not necessarily be one.
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Abstract
Description
Claims (11)
- 室内膨張弁及び室内送風機を有する一又は複数の室内機と、
圧縮機を有する一又は複数の室外機と、
暖房運転時における前記一又は複数の室内機のサーモオフを検出するサーモオフ検出部と、
前記一又は複数の室内機の中に暖房運転を行っていない室内機が存在する場合に、前記圧縮機の動作と、前記一又は複数の室内機の室内膨張弁又は室内送風機の動作と、を前記サーモオフの検出結果に基づいて制御する制御部と、
を備える空気調和機。 - 前記制御部は、サーモオフ状態にある室内機の室内送風機に対して間欠的な送風動作を実行させる、
請求項1に記載の空気調和機。 - 前記制御部は、前記間欠的な送風動作を実行させる前に、サーモオフ状態にある前記室内機の室内膨張弁を閉止する、
請求項2に記載の空気調和機。 - 前記制御部は、前記暖房運転を行っていない室内機以外の室内機に、サーモオフ状態の室内機とサーモオフ状態でない室内機とが混在している場合、サーモオフ状態にある室内機の室内膨張弁を微小量開く、
請求項1から3のいずれか一項に記載の空気調和機。 - 前記制御部は、前記暖房運転を行っていない室内機以外の室内機の全てがサーモオフ状態にある場合、前記圧縮機の動作を停止させる、
請求項1から4のいずれか一項に記載の空気調和機。 - 前記制御部は、前記暖房運転を行っていない室内機に対して予め送風運転が許可されている場合に、前記室内機の室内送風機に対して送風動作を実行させる、
請求項1から5のいずれか一項に記載の空気調和機。 - 前記制御部は、前記暖房運転を行っていない室内機に対して送風動作を実行させる前に、前記室内機の室内膨張弁を閉止する、
請求項6に記載の空気調和機。 - 前記制御部は、前記暖房運転を行っていない室内機に対して予め送風運転が許可されていない場合、前記室内機の室内送風機を停止させる、
請求項1から7のいずれか一項に記載の空気調和機。 - 前記制御部は、前記暖房運転を行っていない室内機の室内送風機を停止させる前に、前記室内機の室内膨張弁を微小量開く、
請求項8に記載の空気調和機。 - 前記暖房運転を行っていない室内機とは、前記空気調和機の暖房運転時において冷房運転又は送風運転が設定されている室内機である、
請求項1から9のいずれか一項に記載の空気調和機。 - 室内膨張弁及び室内送風機を有する一又は複数の室内機と、圧縮機を有する一又は複数の室外機と、を備える空気調和機の制御方法であって、
暖房運転時における前記一又は複数の室内機のサーモオフを検出するステップと、
前記一又は複数の室内機の中に暖房運転を行っていない室内機が存在する場合に、前記圧縮機の動作と、前記一又は複数の室内機の室内膨張弁又は室内送風機の動作と、を前記サーモオフの検出結果に基づいて制御するステップと、
を有する制御方法。
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