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WO2008001687A1 - Climatiseur - Google Patents

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Publication number
WO2008001687A1
WO2008001687A1 PCT/JP2007/062589 JP2007062589W WO2008001687A1 WO 2008001687 A1 WO2008001687 A1 WO 2008001687A1 JP 2007062589 W JP2007062589 W JP 2007062589W WO 2008001687 A1 WO2008001687 A1 WO 2008001687A1
Authority
WO
WIPO (PCT)
Prior art keywords
refrigerant
amount
communication pipe
circuit
volume
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2007/062589
Other languages
English (en)
Japanese (ja)
Inventor
Tadafumi Nishimura
Shinichi Kasahara
Takahiro Yamaguchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daikin Industries Ltd
Original Assignee
Daikin Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daikin Industries Ltd filed Critical Daikin Industries Ltd
Priority to CN2007800233194A priority Critical patent/CN101473177B/zh
Priority to KR1020087031615A priority patent/KR101207004B1/ko
Priority to US12/304,883 priority patent/US20090100849A1/en
Priority to EP07767400.0A priority patent/EP2034261A4/fr
Priority to AU2007264431A priority patent/AU2007264431B2/en
Publication of WO2008001687A1 publication Critical patent/WO2008001687A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • F25B45/00—Arrangements for charging or discharging refrigerant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/005—Arrangement or mounting of control or safety devices of safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • 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
    • 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
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
    • 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
    • F25B2500/01—Geometry problems, e.g. for reducing size
    • 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
    • F25B2500/19—Calculation of parameters
    • 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
    • F25B2600/21—Refrigerant outlet evaporator temperature
    • 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
    • F25B2700/04—Refrigerant level

Definitions

  • the present invention relates to a function for determining the suitability of the amount of refrigerant in a refrigerant circuit of an air conditioner, in particular, an air conditioner configured by connecting a heat source unit and a utilization unit via a refrigerant communication pipe.
  • the present invention relates to a function for determining the suitability of the refrigerant amount in the refrigerant circuit.
  • a separate air conditioner configured by connecting a heat source unit and a utilization unit via a refrigerant communication pipe leads to an insufficient amount of refrigerant in the refrigerant circuit.
  • information such as the length of the refrigerant communication pipe is input (for example, see Patent Document 1).
  • Patent Document 1 JP-A-8-200905
  • An object of the present invention is to make it possible to determine with high accuracy whether or not the amount of refrigerant in the refrigerant circuit is accurate while reducing the effort of inputting information of the refrigerant communication pipe before the operation of the separate type air conditioner. is there.
  • An air conditioner includes a refrigerant circuit configured by connecting a heat source unit and a utilization unit via a refrigerant communication pipe, and a pipe volume calculating means.
  • the pipe volume calculating means connects the heat source unit and the utilization unit via the refrigerant communication pipe and configures the refrigerant circuit, and then the volume of the refrigerant communication pipe is calculated based on the additional charge amount that is additionally charged after the refrigerant circuit is configured. Is calculated.
  • a heat source unit and a utilization unit are connected via a refrigerant communication pipe to form a refrigerant circuit, and then an additional charge amount that is an additional charge amount after the refrigerant circuit is constructed is used for the refrigerant communication pipe. Since the volume is calculated, even if the volume of the refrigerant communication pipe is unknown, the capacity of the refrigerant communication pipe can be obtained by inputting the value of the additional filling amount. The product can be calculated. As a result, it is possible to obtain the volume of the refrigerant communication pipe while minimizing the effort of inputting the information of the refrigerant communication pipe, and as a result, it is possible to accurately determine the suitability of the refrigerant amount in the refrigerant circuit. it can.
  • An air conditioner according to a second aspect of the present invention is the air conditioner according to the first aspect of the invention, wherein the refrigerant or a component device operates in the refrigerant circuit in the refrigerant automatic charging operation in which the refrigerant is additionally charged in the refrigerant circuit. Based on the amount, the refrigerant circuit is further provided with refrigerant amount determination means for determining whether or not the amount of refrigerant charged in the refrigerant circuit has reached the target charging amount. The additional charge amount is the amount of refrigerant additionally charged in the refrigerant circuit during the automatic refrigerant charging operation.
  • the value of the additional charging amount required for calculating the volume of the refrigerant communication pipe can be obtained by performing the automatic refrigerant charging operation.
  • An air conditioner includes a refrigerant circuit configured by connecting a heat source unit and a utilization unit via a refrigerant communication pipe, and a pipe volume calculating means.
  • the pipe volume calculation means is obtained by subtracting the refrigerant quantity in the unit, which is the refrigerant quantity in the portion excluding the refrigerant communication pipe of the refrigerant circuit, which is the refrigerant quantity of the whole refrigerant circuit after the refrigerant is additionally charged. Based on the amount of refrigerant in the communication pipe, which is the amount of refrigerant in the refrigerant communication pipe, the volume of the refrigerant communication pipe is calculated.
  • the amount of refrigerant in the unit which is the amount of refrigerant in the portion of the refrigerant circuit excluding the refrigerant connection pipe, is subtracted from the total amount of refrigerant in the refrigerant circuit, which is the amount of refrigerant in the entire refrigerant circuit after additional charging. Since the volume of the refrigerant connection pipe is calculated based on the amount of refrigerant in the refrigerant connection pipe obtained by the above, the additional charge even if the volume of the refrigerant connection pipe is unknown By inputting the value of the quantity, the volume of the refrigerant communication pipe can be calculated.
  • An air conditioner according to the fourth invention is an air conditioner according to the second invention! And a refrigerant amount calculating means for calculating the amount of refrigerant in the unit, which is the amount of refrigerant in the portion excluding the refrigerant communication pipe of the refrigerant circuit, from the operating state amount of the refrigerant flowing through the refrigerant circuit or the component device in the automatic refrigerant charging operation. Yes.
  • the pipe volume calculating means adds the additional filling amount to the initial filling amount, which is the amount of refrigerant filled in the refrigerant circuit before the automatic refrigerant filling operation, so that the refrigerant amount of the entire refrigerant circuit immediately after the automatic refrigerant filling operation is obtained.
  • the refrigerant quantity flowing in the refrigerant circuit is obtained by obtaining the refrigerant quantity in the communication pipe, which is the refrigerant quantity in the refrigerant communication pipe, by subtracting the refrigerant quantity in the unit from the total refrigerant quantity in the unit.
  • the density of the refrigerant flowing in the refrigerant communication pipe is calculated from the operation state quantity of the component device, and the volume of the refrigerant communication pipe is calculated based on the communication pipe refrigerant amount and density.
  • the amount of refrigerant in the unit in which the refrigerant flowing through the refrigerant circuit in the refrigerant automatic charging operation or the operating state quantity force of the component device is also calculated from the total amount of refrigerant charged by adding the additional charging amount to the initial charging amount.
  • the refrigerant amount of the communication pipe during the refrigerant automatic charging operation can be calculated with high accuracy, so that the volume of the refrigerant communication pipe can be calculated with high accuracy.
  • the air conditioner according to the fifth invention is the air conditioner according to the fourth invention.
  • the refrigerant communication pipe includes a liquid refrigerant communication pipe and a gas refrigerant communication pipe.
  • the pipe volume calculating means calculates the liquid refrigerant density, which is the density of the liquid refrigerant flowing in the liquid refrigerant communication pipe, and the gas density, which is the density of the gas refrigerant flowing in the gas refrigerant communication pipe, to determine the communication pipe refrigerant amount, liquid Based on the volume ratio of the refrigerant communication pipe to the gas refrigerant communication pipe, the liquid refrigerant density, and the gas refrigerant density, the volumes of the liquid refrigerant communication pipe and the gas refrigerant communication pipe are calculated.
  • the pipe length is substantially the same, and the pipes are caused by the difference in the density of the refrigerant flowing in the pipe.
  • the diameter, that is, the flow path cross-sectional area is different.
  • the volume ratio between the liquid coolant communication pipe and the gas refrigerant communication pipe substantially corresponds to the ratio of the flow path cross-sectional areas of both, and the force also depends on the capacity and type of the utilization unit and heat source unit. Since the ratio of the sectional area is determined, this volume ratio is within a certain range.
  • the volume ratio between the liquid refrigerant communication pipe and the gas refrigerant communication pipe is known, the volume of the liquid refrigerant communication pipe is multiplied by the liquid refrigerant density, and the volume of the gas refrigerant communication pipe is multiplied by the gas refrigerant density.
  • the volume of the liquid refrigerant communication pipe and the volume of the gas refrigerant communication pipe can be respectively calculated. Therefore, in this air conditioner, the volume ratio of the liquid refrigerant communication pipe and the volume of the gas refrigerant communication pipe can be calculated easily by setting the volume ratio between the liquid refrigerant communication pipe and the gas refrigerant communication pipe in advance. Can do.
  • the air conditioner according to the sixth aspect of the invention is the air conditioner according to the fourth or fifth aspect of the invention, wherein the refrigerant amount calculating means is the volume of the refrigerant communication pipe calculated by the pipe volume calculating means. Based on the refrigerant flowing through the refrigerant circuit or the operating state quantity of the component equipment in the refrigerant leakage detection operation for determining whether or not the refrigerant leaks from the refrigerant circuit, the total refrigerant quantity of the refrigerant circuit as a whole is calculated. Calculate.
  • the refrigerant amount determination means determines the presence or absence of refrigerant leakage from the refrigerant circuit by comparing the total calculated refrigerant amount with a reference refrigerant amount serving as a reference for determining whether or not refrigerant leakage of the refrigerant circuit force occurs.
  • the volume of the refrigerant communication pipe can be calculated by the pipe volume calculation means, the refrigerant communication pipe calculated by the pipe volume calculation means even when the volume of the refrigerant communication pipe is unknown.
  • the amount of refrigerant in the refrigerant circuit in the refrigerant leakage detection operation can be calculated using the volume of the refrigerant.
  • An air conditioner according to a seventh aspect of the invention is the air conditioner according to the second aspect of the invention, wherein the pipe volume calculation means is arranged in the refrigerant communication pipe from the operating state quantity of the refrigerant flowing through the refrigerant circuit or the component equipment. Calculate the density of the flowing refrigerant, and calculate the volume of the refrigerant communication pipe based on the additional charge amount and density.
  • the refrigerant of the refrigerant circuit is used.
  • the amount can be regarded as equivalent to the amount of refrigerant present in the refrigerant communication pipe.
  • the refrigerant The volume of the communication pipe can be calculated with high accuracy.
  • An air conditioner according to an eighth aspect is the air conditioner according to the seventh aspect, wherein the refrigerant communication pipe includes a liquid refrigerant communication pipe and a gas refrigerant communication pipe.
  • the pipe volume calculating means calculates the liquid refrigerant density, which is the density of the liquid refrigerant flowing in the liquid refrigerant communication pipe, and the gas refrigerant density, which is the density of the gas refrigerant flowing in the gas refrigerant communication pipe, to obtain the additional filling amount and liquid Based on the volume ratio of the refrigerant communication pipe to the gas refrigerant communication pipe, the liquid refrigerant density, and the gas refrigerant density, the volumes of the liquid refrigerant communication pipe and the gas refrigerant communication pipe are calculated.
  • the pipe length is substantially the same, and the pipes are caused by the difference in the density of the refrigerant flowing in the pipe.
  • the diameter, that is, the flow path cross-sectional area is different.
  • the volume ratio between the liquid coolant communication pipe and the gas refrigerant communication pipe substantially corresponds to the ratio of the flow path cross-sectional areas of both, and the force also depends on the capacity and type of the utilization unit and heat source unit. Since the ratio of the sectional area is determined, this volume ratio is within a certain range.
  • the volume ratio between the liquid refrigerant communication pipe and the gas refrigerant communication pipe is known, the value obtained by multiplying the volume of the liquid refrigerant communication pipe by the liquid refrigerant density and the value obtained by multiplying the volume of the gas refrigerant communication pipe by the gas refrigerant density. As a result, it becomes possible to calculate the volume of the liquid refrigerant communication pipe and the volume of the gas refrigerant communication pipe, respectively.
  • the volume ratio of the liquid refrigerant communication pipe and the volume of the gas refrigerant communication pipe can be calculated easily by setting the volume ratio between the liquid refrigerant communication pipe and the gas refrigerant communication pipe in advance. Can do.
  • the air conditioner according to the ninth invention is the air conditioner according to the seventh or eighth invention, wherein the refrigerant communication pipe volume calculated by the pipe volume calculating means and the refrigerant from the refrigerant circuit Refrigerant amount calculation that calculates the total amount of refrigerant, which is the amount of refrigerant in the entire refrigerant circuit, based on the refrigerant or the operating state quantity of the component equipment that flows through the refrigerant circuit in the refrigerant leak detection operation that determines whether there is a leak Means are further provided.
  • the refrigerant amount determination means determines whether or not the refrigerant leaks from the refrigerant circuit by comparing the total calculated refrigerant amount with a reference refrigerant amount that is a criterion for determining whether or not the refrigerant leaks in the refrigerant circuit force.
  • the volume of the refrigerant communication pipe is calculated by the pipe volume calculation means. Therefore, even if the volume of the refrigerant communication pipe is unknown, the amount of refrigerant in the refrigerant circuit in the refrigerant leakage detection operation using the volume of the refrigerant communication pipe calculated by the pipe volume calculation means Can be calculated. As a result, it is possible to determine with high accuracy whether or not the refrigerant leaks in the refrigerant circuit force while reducing the effort of inputting information of the refrigerant communication pipe as much as possible.
  • FIG. 1 is a schematic configuration diagram of an air conditioner according to an embodiment of the present invention.
  • FIG. 2 is a control block diagram of the air conditioner.
  • FIG. 3 is a flowchart of a test operation mode.
  • FIG. 4 is a flowchart of an automatic refrigerant charging operation.
  • FIG. 5 is a schematic diagram showing the state of the refrigerant flowing in the refrigerant circuit in the refrigerant quantity determination operation (illustration of a four-way switching valve and the like is omitted).
  • FIG. 6 is a flowchart of pipe volume calculation processing.
  • FIG. 7 is a flowchart of a refrigerant leak detection operation mode.
  • FIG. 1 is a schematic configuration diagram of an air-conditioning apparatus 1 according to one embodiment of the present invention.
  • the air conditioner 1 is an apparatus used for air conditioning in a room such as a building by performing a vapor compression refrigeration cycle operation.
  • the air conditioner 1 mainly includes one heat source unit and The outdoor unit 2 and a plurality of (in this embodiment, two) indoor units 4 and 5 that are connected in parallel, and the outdoor unit 2 and the indoor units 4 and 5 are connected to each other.
  • a liquid refrigerant communication pipe 6 and a gas refrigerant communication pipe 7 are provided as refrigerant communication pipes. That is, in the vapor compression refrigerant circuit 10 of the air conditioner 1 of the present embodiment, the outdoor unit 2, the indoor units 4, 5, the liquid refrigerant communication pipe 6 and the gas refrigerant communication pipe 7 are connected. Consists of this.
  • the indoor units 4 and 5 are installed by being embedded or suspended in the ceiling of a room such as a building or by hanging on the wall surface of the room.
  • the indoor units 4 and 5 are connected to the outdoor unit 2 via the liquid refrigerant communication pipe 6 and the gas refrigerant communication pipe 7 and constitute a part of the refrigerant circuit 10.
  • the configuration of the indoor units 4 and 5 will be described. Since the indoor unit 4 and the indoor unit 5 have the same configuration, only the configuration of the indoor unit 4 will be described here, and the configuration of the indoor unit 5 indicates each part of the indoor unit 4 respectively. Instead of the 40's code, the 50's code is used, and the description of each part is omitted.
  • the indoor unit 4 mainly includes an indoor refrigerant circuit 10a (in the indoor unit 5, the indoor refrigerant circuit 10b) that constitutes a part of the refrigerant circuit 10.
  • the indoor refrigerant circuit 10a mainly has an indoor expansion valve 41 as an expansion mechanism and an indoor heat exchange 42 as a use side heat exchanger.
  • the indoor expansion valve 41 is an electric expansion valve connected to the liquid side of the indoor heat exchanger 42 in order to adjust the flow rate of the refrigerant flowing in the indoor refrigerant circuit 10a.
  • the indoor heat exchange is a cross-fin type fin 'and' tube heat exchanger composed of heat transfer tubes and a large number of fins, and functions as a refrigerant evaporator during cooling operation. It is a heat exchanger that functions as a refrigerant condenser during heating operation to heat indoor air.
  • the indoor unit 4 sucks indoor air into the unit, exchanges heat with the refrigerant in the indoor heat exchanger 42, and supplies the indoor air as supply air to the room.
  • It has an indoor fan 43 as a blower fan.
  • the indoor fan 43 is a fan capable of changing the air volume Wr of air supplied to the indoor heat exchanger 42, and in this embodiment, the centrifugal fan or the multiblade fan driven by the motor 43a that also has DC fan motor power. Etc.
  • the indoor unit 4 is provided with various sensors. On the liquid side of the indoor heat exchanger 42, a liquid side temperature sensor 44 that detects the temperature of the refrigerant (that is, the refrigerant temperature corresponding to the condensation temperature Tc during heating operation or the evaporation temperature Te during cooling operation) is provided. ing. A gas side temperature sensor 45 for detecting the refrigerant temperature Teo is provided on the gas side of the indoor heat exchanger 42. An indoor temperature sensor 46 for detecting the temperature of indoor air flowing into the unit (that is, the indoor temperature Tr) is provided on the indoor air inlet side of the indoor unit 4.
  • the liquid side temperature sensor 44, the gas side temperature sensor 45, and the room temperature sensor 46 are composed of thermistors.
  • the indoor unit 4 also has an indoor side control unit 47 that controls the operation of each part constituting the indoor unit 4.
  • the indoor control unit 47 includes a microcomputer, a memory, and the like provided for controlling the indoor unit 4, and a remote controller (not shown) for individually operating the indoor unit 4. Control signals etc. can be exchanged with the outdoor unit 2 and control signals etc. can be exchanged with the outdoor unit 2 via the transmission line 8a.
  • the outdoor unit 2 is installed outside a building or the like, and is connected to the indoor units 4 and 5 via the liquid refrigerant communication pipe 6 and the gas refrigerant communication pipe 7. Circuit 10 is configured.
  • the outdoor unit 2 mainly has an outdoor refrigerant circuit 10c that constitutes a part of the refrigerant circuit 10.
  • This outdoor refrigerant circuit 10c mainly includes a compressor 21, a four-way switching valve 22, an outdoor heat exchanger 23 as a heat source side heat exchange, an outdoor expansion valve 38 as an expansion mechanism, an accumulator 24, A supercooler 25 as a temperature adjusting mechanism, a liquid side closing valve 26 and a gas side closing valve 27 are provided.
  • the compressor 21 is a compressor whose operating capacity can be varied.
  • the compressor 21 is a positive displacement pressure driven by a motor 21a whose rotational speed Rm is controlled by an inverter. It is a contractor.
  • the number of the compressors 21 is only one, but is not limited to this, and two or more compressors may be connected in parallel according to the number of indoor units connected.
  • the four-way switching valve 22 is a valve for switching the flow direction of the refrigerant.
  • the outdoor heat exchanger 23 serves as a refrigerant condenser compressed by the compressor 21, and the indoor
  • the heat exchangers 42 and 52 to function as an evaporator for the refrigerant condensed in the outdoor heat exchanger 23
  • the discharge side of the compressor 21 and the gas side of the outdoor heat exchanger 23 are connected and the suction side of the compressor 21 ( Specifically, the accumulator 24) and the gas refrigerant communication pipe 7 side are connected (see the solid line of the four-way selector valve 22 in Fig. 1), and the indoor heat exchangers 42 and 52 are connected to the compressor 21 during heating operation.
  • the discharge side of the compressor 21 and the gas refrigerant communication pipe 7 side and the suction side of the compressor 21 and the gas side of the outdoor heat exchange Can be connected (see the dashed line of the four-way selector valve 22 in FIG. 1).
  • the outdoor heat exchange is a cross-fin type fin 'and' tube heat exchanger composed of heat transfer tubes and a large number of fins, and functions as a refrigerant condenser during cooling operation. This is heat exchange that functions as a refrigerant evaporator during heating operation.
  • the outdoor heat exchanger 23 has a gas side connected to the four-way switching valve 22 and a liquid side connected to the liquid coolant communication pipe 6.
  • the outdoor expansion valve 38 is an electric expansion valve connected to the liquid side of the outdoor heat exchanger 23 in order to adjust the pressure and flow rate of the refrigerant flowing in the outdoor refrigerant circuit 10c.
  • the outdoor unit 2 has an outdoor fan 28 as a blower fan for sucking outdoor air into the unit, exchanging heat with the refrigerant in the outdoor heat exchanger 23, and then discharging the air outside.
  • the outdoor fan 28 is a fan capable of changing the air volume Wo of the air supplied to the outdoor heat exchanger ⁇ 23.
  • the outdoor fan 28 is a propeller fan or the like driven by a motor 28a having a DC fan motor power. is there.
  • the accumulator 24 is connected between the four-way selector valve 22 and the compressor 21, and This is a container capable of accumulating surplus refrigerant generated in the refrigerant circuit 10 in accordance with fluctuations in the operating load of the knits 4 and 5.
  • the subcooler 25 is a double-pipe heat exchanger, and is provided to cool the refrigerant sent to the indoor expansion valves 41 and 51 after being condensed in the outdoor heat exchanger 23. ing.
  • the supercooler 25 is connected between the outdoor expansion valve 38 and the liquid side closing valve 26.
  • a bypass refrigerant circuit 61 as a cooling source for the subcooler 25 is provided.
  • the part excluding the bypass refrigerant circuit 61 from the refrigerant circuit 10 will be referred to as a main refrigerant circuit for convenience.
  • the bypass refrigerant circuit 61 is provided in the main refrigerant circuit so that a part of the refrigerant sent from the outdoor heat exchanger 23 to the indoor expansion valves 41, 51 is branched from the main refrigerant circuit and returned to the suction side of the compressor 21. It is connected. Specifically, the bypass refrigerant circuit 61 connects a part of the refrigerant sent from the outdoor expansion valve 38 to the indoor expansion valves 41 and 51 so that the positional force between the outdoor heat exchanger and the subcooler 25 also branches. And the junction circuit 61b connected to the suction side of the compressor 21 so as to return to the suction side of the compressor 21 from the outlet of the bypass refrigerant circuit side of the subcooler 25. .
  • the branch circuit 61a is provided with a bypass expansion valve 62 for adjusting the flow rate of the refrigerant flowing through the bypass refrigerant circuit 61.
  • the bypass expansion valve 62 also has an electric expansion valve force.
  • the refrigerant sent from the outdoor heat exchanger 23 to the indoor expansion valves 41 and 51 is cooled by the refrigerant flowing in the bypass refrigerant circuit 61 after being depressurized by the no-pass expansion valve 62 in the supercooler 25. That is, the capacity control of the subcooler 25 is performed by adjusting the opening degree of the bypass expansion valve 62.
  • the liquid side shut-off valve 26 and the gas side shut-off valve 27 are valves provided at connection ports with external devices and pipes (specifically, the liquid refrigerant communication pipe 6 and the gas refrigerant communication pipe 7). .
  • the liquid side closing valve 26 is connected to the outdoor heat exchanger 23.
  • the gas side closing valve 27 is connected to the four-way switching valve 22.
  • the outdoor unit 2 is provided with various sensors. Specifically, the outdoor unit 2 includes a suction pressure sensor 29 that detects the suction pressure Ps of the compressor 21, a discharge pressure sensor 30 that detects the discharge pressure Pd of the compressor 21, and the compressor 21. Detect suction temperature Ts An intake temperature sensor 31 and a discharge temperature sensor 32 for detecting the discharge temperature Td of the compressor 21 are provided. The suction temperature sensor 31 is provided at a position between the accumulator 24 and the compressor 21.
  • the outdoor heat exchanger 23 includes a heat exchange temperature sensor that detects the temperature of the refrigerant flowing in the outdoor heat exchanger 23 (that is, the refrigerant temperature corresponding to the condensation temperature Tc during the cooling operation or the evaporation temperature Te during the heating operation). 33 is provided.
  • a liquid side temperature sensor 34 for detecting the temperature Tco of the refrigerant is provided on the liquid side of the outdoor heat exchanger 23 .
  • a liquid pipe temperature sensor 35 that detects the temperature of the refrigerant (that is, the liquid pipe temperature Tip) is provided at the outlet of the subcooler 25 on the main refrigerant circuit side.
  • the junction circuit 6 lb of the no-pass refrigerant circuit 61 is provided with a bypass temperature sensor 63 for detecting the temperature of the refrigerant flowing through the outlet of the subcooler 25 on the bypass refrigerant circuit side.
  • An outdoor temperature sensor 36 for detecting the temperature of the outdoor air flowing into the unit (that is, the outdoor temperature Ta) is provided on the outdoor air inlet side of the outdoor unit 2.
  • the suction temperature sensor 31, the discharge temperature sensor 32, the heat exchange temperature sensor 33, the liquid side temperature sensor 34, the liquid pipe temperature sensor 35, the outdoor temperature sensor 36, and the binose temperature sensor 63 are composed of thermistors.
  • the outdoor unit 2 also has an outdoor control unit 37 that controls the operation of each part constituting the outdoor unit 2.
  • the outdoor control unit 37 includes a microcomputer provided to control the outdoor unit 2, an inverter circuit that controls the memory and the motor 21 a, and the indoor control units of the indoor units 4 and 5. Control signals etc. can be exchanged with 47 and 57 via the transmission line 8a. That is, the control unit 8 that controls the operation of the entire air conditioner 1 is configured by the indoor control units 47 and 57, the outdoor control unit 37, and the transmission line 8a that connects the control units 37, 47, and 57. Yes.
  • this sensor is connected so that it can receive the detection signals of various sensors 29 to 36, 44 to 46, 54 to 56, 63 and detect these signals. It is connected so that various devices and valves 21, 22, 24, 28a, 38, 41, 43a, 51, 53a, 62 can be controlled based on signals.
  • the control unit 8 inputs or changes set values for various controls, or the amount of refrigerant that is additionally charged in the refrigerant circuit 10 by the refrigerant automatic charging operation described later, including the initial charging amount.
  • An input unit 9a is provided so that the quantity can be input.
  • FIG. 2 is a control block diagram of the air conditioner 1.
  • the input unit 9a is not limited to the one provided in the control unit 8, and is connected to the control unit 8 as necessary when inputting an additional charge amount or a total charge refrigerant amount. Also good.
  • Refrigerant communication pipes 6 and 7 are refrigerant pipes that are installed on site when the air conditioner 1 is installed in a building or other location, such as a combination of the installation location or outdoor unit and indoor unit. Depending on the installation conditions, those having various lengths and pipe diameters are used. For this reason, for example, when a new air conditioner is installed, it is necessary to accurately grasp information such as the length of the refrigerant communication pipes 6 and 7 in order to calculate the additional refrigerant charging amount. Although there is information management, the calculation of the refrigerant amount itself is complicated. In addition, when the existing unit is used to update the indoor unit or the outdoor unit, the blueprints such as the length and diameter of the refrigerant communication pipes 6 and 7 may be lost.
  • the refrigerant circuit 10 of the air conditioner 1 is configured by connecting the indoor refrigerant circuits 10a and 10b, the outdoor refrigerant circuit 10c, and the refrigerant communication pipes 6 and 7.
  • the refrigerant circuit 10 can be paraphrased as being composed of a bypass refrigerant circuit 61 and a main refrigerant circuit excluding the bypass refrigerant circuit 61.
  • the air conditioner 1 according to the present embodiment is operated by switching the cooling operation and the heating operation by the four-way switching valve 22 by the control unit 8 including the indoor side control units 47 and 57 and the outdoor side control unit 37.
  • the outdoor unit 2 and the indoor units 4 and 5 are controlled according to the operation load of the indoor units 4 and 5.
  • the normal operation mode of the air conditioner 1 of the present embodiment for controlling the components of the outdoor unit 2 and the indoor units 4 and 5 according to the operation load of the indoor units 4 and 5;
  • After installation of components of air conditioner 1 Specifically, not limited to after installation of the first device, for example, after modification or addition of components such as indoor units, A test run mode for performing a test run performed after repairing the fault) and a refrigerant for determining whether or not refrigerant leaks from the refrigerant circuit 10 after the test run is finished and a normal operation is started.
  • the normal operation mode mainly includes a cooling operation for cooling the room and a heating operation for heating the room.
  • the test operation mode mainly includes an automatic refrigerant charging operation for charging the refrigerant into the refrigerant circuit 10 and a pipe volume calculation process for calculating the volume of the refrigerant communication pipes 6 and 7.
  • the cooling operation in the normal operation mode will be described with reference to FIGS. 1 and 2.
  • the four-way switching valve 22 is in the state indicated by the solid line in FIG. 1, that is, the discharge side of the compressor 21 is the outdoor heat. It is connected to the gas side of the exchanger 23, and the suction side of the compressor 21 is connected to the gas side of the indoor heat exchangers 42 and 52 via the gas side closing valve 27 and the gas refrigerant communication pipe 7. Yes.
  • the outdoor expansion valve 38 is fully opened.
  • the liquid side closing valve 26 and the gas side closing valve 27 are in an open state.
  • the indoor expansion valves 41 and 51 are opened so that the superheat degree SHr of the refrigerant at the outlets of the indoor heat exchangers 42 and 52 (that is, the gas side of the indoor heat exchangers 42 and 52) is constant at the superheat degree target value SHrs.
  • the degree is adjusted! /
  • the degree of superheat SHr of the refrigerant at the outlets of the indoor heat exchangers 42, 52 is the refrigerant temperature value detected by the gas side temperature sensors 45, 55, and the refrigerant temperature sensors 44, 54 also detect the refrigerant temperature value force.
  • the superheat degree SHr of the refrigerant at the outlets of the indoor heat exchangers 42 and 52 may be detected.
  • the bypass expansion valve 62 is adjusted in opening degree so that the superheat degree SHb of the refrigerant at the outlet on the bypass refrigerant circuit side of the supercooler 25 becomes the superheat degree target value SHbs.
  • the superheat degree SHb of the refrigerant at the outlet on the bypass refrigerant circuit side of the subcooler 25 is the saturation temperature value corresponding to the evaporation pressure Te, which is the suction pressure Ps of the compressor 21 detected by the suction pressure sensor 29.
  • a temperature sensor is provided at the bypass refrigerant circuit side inlet of the subcooler 25, and the refrigerant temperature value detected by this temperature sensor is detected by the bypass temperature sensor 63.
  • the refrigerant superheat degree SHb at the outlet of the subcooler 25 on the bypass refrigerant circuit side may be detected by subtracting the refrigerant temperature value.
  • a part of the high-pressure liquid refrigerant condensed in the outdoor heat exchange is branched to the bypass refrigerant circuit 61, decompressed by the bypass expansion valve 62, and then returned to the suction side of the compressor 21.
  • a part of the refrigerant passing through the binos expansion valve 62 is evaporated by being reduced to near the suction pressure Ps of the compressor 21.
  • the refrigerant flowing in the direction of the outlet force of the bypass expansion valve 62 of the bypass refrigerant circuit 61 toward the suction side of the compressor 21 passes through the subcooler 25 and from the outdoor heat exchanger 23 on the main refrigerant circuit side. Exchanges heat with high-pressure liquid refrigerant sent to indoor units 4 and 5.
  • the high-pressure liquid refrigerant in the supercooled state is sent to the indoor units 4 and 5 via the liquid-side closing valve 26 and the liquid refrigerant communication pipe 6.
  • the high-pressure liquid refrigerant sent to the indoor units 4 and 5 is reduced to near the suction pressure Ps of the compressor 21 by the indoor expansion valves 41 and 51.
  • the refrigerant becomes a low-pressure gas-liquid two-phase refrigerant and is sent to the indoor heat exchangers 42 and 52.
  • the indoor heat exchangers 42 and 52 exchange heat with indoor air and evaporate to become low-pressure gas refrigerant.
  • This low-pressure gas refrigerant is sent to the outdoor unit 2 via the gas refrigerant communication pipe 7 and flows into the accumulator 24 via the gas side closing valve 27 and the four-way switching valve 22. Then, the low-pressure gas refrigerant that has flowed into the accumulator 24 is again sucked into the compressor 21.
  • the four-way switching valve 22 is in the state indicated by the broken line in FIG. 1, that is, the discharge side of the compressor 21 is connected to the indoor heat exchanger 42 via the gas-side closing valve 27 and the gas refrigerant communication pipe 7. 52, and the suction side of the compressor 21 is connected to the gas side of the outdoor heat exchanger 23.
  • the degree of opening of the outdoor expansion valve 38 is adjusted to reduce the pressure of the refrigerant flowing into the outdoor heat exchanger 23 to a pressure at which the refrigerant can be evaporated in the outdoor heat exchanger (that is, the evaporation pressure Pe). Further, the liquid side closing valve 26 and the gas side closing valve 27 are opened.
  • the indoor expansion valves 41 and 51 are adjusted in opening degree so that the supercooling degree SCr of the refrigerant at the outlets of the indoor heat exchangers 42 and 52 becomes constant at the supercooling degree target value SCrs.
  • the degree of refrigerant supercooling SCr at the outlets of the indoor heat exchangers 42 and 52 is the saturation temperature value corresponding to the condensation temperature Tc, which is the discharge pressure Pd of the compressor 21 detected by the discharge pressure sensor 30.
  • the refrigerant temperature value is detected by subtracting the refrigerant temperature value detected by the liquid side temperature sensors 44 and 54 from the saturation temperature value of the refrigerant.
  • a temperature sensor that detects the temperature of the refrigerant flowing in each indoor heat exchanger 42, 52 is provided, and the refrigerant corresponding to the condensation temperature Tc detected by this temperature sensor.
  • the subcooling degree SCr of the refrigerant at the outlets of the indoor heat exchangers 42, 52 may be detected by subtracting the temperature value from the refrigerant temperature value detected by the liquid side temperature sensors 44, 54. Further, the bypass expansion valve 62 is closed.
  • the compressor 21, the outdoor fan 28, and the indoor fans 43, 53 are started in the state of the refrigerant circuit 10, the low-pressure gas refrigerant is sucked into the compressor 21 and compressed to become a high-pressure gas refrigerant.
  • the indoor units 4 and 5 are sent through the four-way switching valve 22, the gas side closing valve 27 and the gas refrigerant communication pipe 7.
  • the high-pressure gas refrigerant sent to the indoor units 4 and 5 is condensed by exchanging heat with the indoor air in the outdoor heat exchangers ⁇ 42 and 52 to become a high-pressure liquid refrigerant.
  • the pressure is reduced according to the opening degree of the indoor expansion valves 41 and 51.
  • the refrigerant that has passed through the indoor expansion valves 41 and 51 is sent to the outdoor unit 2 via the liquid refrigerant communication pipe 6 and passes through the liquid side closing valve 26, the supercooler 25, and the outdoor expansion valve 38.
  • the pressure is further reduced and then flows into the outdoor heat exchanger 23.
  • the low-pressure gas-liquid two-phase refrigerant flowing into the outdoor heat exchanger 23 exchanges heat with the outdoor air supplied by the outdoor fan 28 to evaporate into a low-pressure gas refrigerant.
  • control unit 8 (more specifically, the indoor side control units 47, 57 functioning as normal operation control means for performing normal operation including cooling operation and heating operation. And the transmission line 8a) connecting the outdoor control unit 37 and the control units 37, 47, and 57.
  • Fig. 3 is a flowchart of the test operation mode.
  • the refrigerant automatic charging operation in step S1 is performed, and then the pipe volume calculation process in step S2 is performed.
  • the outdoor unit 2 pre-filled with the refrigerant and the indoor units 4 and 5 are installed at a place such as a building and connected via the liquid refrigerant communication pipe 6 and the gas refrigerant communication pipe 7.
  • a place such as a building and connected via the liquid refrigerant communication pipe 6 and the gas refrigerant communication pipe 7.
  • the refrigerant circuit 10 is additionally filled with a refrigerant that is insufficient in accordance with the volume of the liquid refrigerant communication pipe 6 and the gas refrigerant communication pipe 7.
  • Step S1 Refrigerant automatic charging operation
  • the liquid side shutoff valve 26 and the gas side shutoff valve 27 of the outdoor unit 2 are opened, and the refrigerant circuit 10 is filled with the refrigerant filled in the outdoor unit 2 in advance.
  • FIG. 4 is a flowchart of the automatic refrigerant charging operation.
  • Step S11 Refrigerant amount judgment operation
  • the refrigerant circuit 10 When an instruction to start the automatic refrigerant charging operation is made, the refrigerant circuit 10 is in a state where the four-way switching valve 22 of the outdoor unit 2 is shown by a solid line in FIG. 1 and the indoor expansion valves 41 of the indoor units 4 and 5 51 and outdoor expansion valve 38 are opened, compressor 21, outdoor fan 28 and indoor fans 4 3, 53 are activated, and all indoor units 4, 5 are forcibly cooled (hereinafter referred to as the total number of indoor units). Driving).
  • the high-pressure gas refrigerant compressed and discharged in the compressor 21 flows through the flow path from the compressor 21 to the outdoor heat exchange functioning as a condenser ( (Refer to the hatched part in Fig. 5 from the compressor 21 to the outdoor heat exchanger 23), and the outdoor heat exchanger 23 functioning as a condenser is changed from a gas state to a liquid state by heat exchange with the outdoor air. (Refer to the portion corresponding to the outdoor heat exchanger 23 in the hatched and black hatched portions in FIG.
  • High-pressure liquid is present in the flow path including the outdoor expansion valve 38, the part of the subcooler 25 on the main refrigerant circuit side and the liquid refrigerant communication pipe 6 and the flow path from the outdoor heat exchanger 23 to the bypass expansion valve 62.
  • the refrigerant flows (out of the black hatched parts in Fig.
  • FIG. 5 is a schematic diagram showing the state of the refrigerant flowing in the refrigerant circuit 10 in the refrigerant amount determination operation (illustration of the four-way switching valve 22 and the like is omitted).
  • the following device control is performed to shift to an operation for stabilizing the state of the refrigerant circulating in the refrigerant circuit 10.
  • the indoor expansion valves 41 and 51 are controlled so that the superheat degree SHr of the indoor heat exchangers 42 and 52 functioning as an evaporator becomes constant (hereinafter referred to as superheat degree control).
  • the operation capacity of the compressor 21 is controlled so as to be constant (hereinafter referred to as evaporation pressure control), and the outdoor fan 28 is used for outdoor heat exchange so that the refrigerant condensation pressure Pc in the outdoor heat exchanger 23 is constant.
  • the subcooler is controlled so that the air volume Wo of the outdoor air supplied to the cooler 23 is controlled (hereinafter referred to as condensing pressure control) and the temperature of the refrigerant sent from the supercooler 25 to the indoor expansion valves 41 and 51 is constant.
  • the indoor fan 43, 53 controls the indoor heat exchanger 42 so that the refrigerant evaporating pressure Pe is controlled stably by the above evaporating pressure control.
  • the air volume Wr of the indoor air supplied to No. 52 is kept constant.
  • the evaporation pressure control is performed in the indoor heat exchangers 42 and 52 functioning as an evaporator in a gas-liquid two-phase state force due to heat exchange with the room air, while the phase is changed to a gas state and a low pressure.
  • Inside the indoor heat exchanger ⁇ 42, 52 through which the refrigerant flows see the section corresponding to the indoor heat exchangers 42, 52 in the grid-shaped, hatched and hatched hatched parts in Fig. 5; This is because the amount of refrigerant in (part C) greatly affects the evaporation pressure Pe of the refrigerant.
  • the evaporation pressure Pe of the refrigerant in the indoor heat exchangers 42 and 52 is made constant, and the evaporator The state of the refrigerant flowing in the part C is stabilized, and a state in which the amount of refrigerant in the evaporator C is changed mainly by the evaporation pressure Pe is created.
  • the refrigerant temperature value (corresponding to the evaporation temperature Te) detected by the liquid side temperature sensors 44, 54 of the indoor heat exchangers 42, 52 is used as the saturation pressure.
  • the operating capacity of the compressor 21 is controlled so that this pressure value becomes constant at the low pressure target value Pes (that is, control for changing the rotational speed Rm of the motor 21a) is performed so that the refrigerant This is realized by increasing or decreasing the refrigerant circulation amount Wc flowing in the circuit 10.
  • the compression detected by the suction pressure sensor 29, which is an operation state quantity equivalent to the refrigerant pressure at the refrigerant evaporating pressure Pe in the indoor heat exchangers 42 and 52, is used.
  • the suction pressure Ps of the machine 21 is constant at the low pressure target value Pes, or the saturation temperature value (corresponding to the evaporation temperature Te) corresponding to the suction pressure Ps is constant at the low pressure target value Tes.
  • the operating capacity of the compressor 21 may be controlled, and the refrigerant temperature value (corresponding to the evaporation temperature Te) detected by the liquid side temperature sensors 44 and 54 of the indoor heat exchangers 42 and 52 is the low pressure target value Tes.
  • the operating capacity of the compressor 21 may be controlled so as to be constant.
  • the refrigerant refrigerant pipe including the gas refrigerant communication pipe 7 and the accumulator 24 from the indoor heat exchangers 42 and 52 to the compressor 21 (the hatched portion in FIG. Among these, the state of the refrigerant flowing through the indoor heat exchangers 42 and 52 to the compressor 21 (hereinafter referred to as gas refrigerant circulation section D) is also stable, and mainly the refrigerant flow in the gas refrigerant circulation section D.
  • a state is created in which the amount of refrigerant in the gas refrigerant circulation portion D is changed by the evaporation pressure Pe (that is, the suction pressure Ps), which is an operation state amount equivalent to the pressure.
  • Condensation pressure control is also performed in the outdoor heat exchanger ⁇ 23 in which high-pressure refrigerant flows while changing the gas state force to the liquid state due to heat exchange with the outdoor air (hatched hatched and blackened in Fig. 5).
  • the condenser portion A which is also the force that greatly affects the refrigerant condensing pressure Pc. Since the refrigerant condensing pressure Pc in the condenser part A changes greatly due to the influence of the outdoor temperature Ta, the air volume Wo of the indoor air supplied from the outdoor fan 28 to the outdoor heat exchanger 23 is controlled by the motor 28a.
  • the condensation pressure Pc of the refrigerant in the outdoor heat exchanger 23 is made constant, and the state of the refrigerant flowing in the condenser section A is stabilized, and mainly the liquid side of the outdoor heat exchanger 23 (hereinafter referred to as the refrigerant).
  • the refrigerant amount in the condenser A is changed by the degree of supercooling SCo at the outlet of the outdoor heat exchanger 23).
  • the compressor 21 detected by the discharge pressure sensor 30 which is an operation state amount equivalent to the refrigerant condensation pressure Pc in the outdoor heat exchanger 23 is used.
  • Discharge pressure Pd or temperature of refrigerant flowing in the outdoor heat exchanger 23 detected by the heat exchanger temperature sensor 33 In other words, the condensation temperature Tc) is used.
  • the liquid pipe temperature control is performed in the refrigerant pipe including the liquid refrigerant communication pipe 6 from the subcooler 25 to the indoor expansion valves 41 and 51 (the subcooler in the liquid refrigerant circulation section B shown in FIG. 5). This is to prevent the refrigerant density from changing from 25 to the indoor expansion valves 41 and 51).
  • the capacity control of the subcooler 25 is controlled so that the refrigerant temperature Tip detected by the liquid pipe temperature sensor 35 provided at the outlet of the main refrigerant circuit of the subcooler 25 is constant at the liquid pipe temperature target value Tips.
  • the flow rate of the refrigerant flowing through the bypass refrigerant circuit 61 is increased or decreased to adjust the amount of heat exchanged between the refrigerant flowing through the main refrigerant circuit side of the subcooler 25 and the refrigerant flowing through the bypass refrigerant circuit side. Yes.
  • the flow rate of the refrigerant flowing through the bypass refrigerant circuit 61 is increased or decreased by adjusting the opening degree of the bypass expansion valve 62.
  • liquid pipe temperature control is realized in which the refrigerant temperature in the refrigerant pipe including the liquid refrigerant communication pipe 6 extending from the supercooler 25 to the indoor expansion valves 41 and 51 is constant.
  • the refrigerant heat is filled in the refrigerant circuit 10, and as the amount of refrigerant in the refrigerant circuit 10 gradually increases, the outdoor heat exchange 23
  • the refrigerant temperature Tco at the outlet of the outdoor heat exchanger 23 is changed even when the refrigerant temperature Tco at the outlet of the outdoor heat exchanger 23 changes (that is, the degree of refrigerant supercooling SCo at the outlet of the outdoor heat exchanger 23).
  • the superheat control is performed because the amount of refrigerant in the evaporator section C greatly affects the dryness of the refrigerant at the outlets of the indoor heat exchangers 42 and 52.
  • This indoor heat exchange The superheat degree SHr of the refrigerant at the outlet of 52 is controlled by controlling the opening degree of the indoor expansion valves 41 and 51, so that the gas side of the indoor heat exchangers 42 and 52 (hereinafter, in the description of the refrigerant amount determination operation,
  • the superheat degree SHr of the refrigerant in the indoor heat exchangers 42 and 52 is made constant at the superheat degree target value SHrs (that is, the gas refrigerant at the outlets of the indoor heat exchangers 42 and 52 is overheated).
  • SHrs the superheat degree target value
  • the state of the refrigerant circulating in the refrigerant circuit 10 is stabilized, and the distribution of the refrigerant amount in the refrigerant circuit 10 becomes constant.
  • the refrigerant begins to be charged, it is possible to create a state in which the change in the refrigerant amount in the refrigerant circuit 10 mainly appears as a change in the refrigerant amount in the outdoor heat exchanger 23 (hereinafter, this operation is performed). Is the refrigerant quantity determination operation).
  • control unit 8 (more specifically, the indoor side control units 47 and 57, the outdoor side control unit 37, and the control unit 37, which functions as a refrigerant amount determination operation control unit that performs the refrigerant amount determination operation.
  • the transmission line 8a) connecting 47 and 57 is performed as the process of step S11.
  • Step S12 Calculation of refrigerant amount
  • step S12 additional refrigerant charging is performed in the refrigerant circuit 10 while performing the above-described refrigerant amount determination operation.
  • the additional charging of the refrigerant in step S12 is performed by the control unit 8 functioning as the refrigerant amount calculating means.
  • the refrigerant amount in the refrigerant circuit 10 is calculated from the refrigerant flowing through the refrigerant circuit 10 at the time or the operating state quantity of the component equipment.
  • the refrigerant quantity calculating means calculates the refrigerant quantity in the refrigerant circuit 10 by dividing the refrigerant circuit 10 into a plurality of parts and calculating the refrigerant quantity for each of the divided parts. More specifically, for each of the divided parts, a relational expression between the refrigerant amount of each part and the operating state quantity of the refrigerant flowing through the refrigerant circuit 10 or the component device is set. By using it, the amount of refrigerant in each part can be calculated.
  • the refrigerant circuit 10 includes the four-way switching valve 22 in the state indicated by the solid line in FIG.
  • the discharge side of the compressor 21 is connected to the gas side of the outdoor heat exchanger 23, and ,
  • the suction side of the compressor 21 is the gas side closing valve In the state connected to the outlets of the indoor heat exchangers 42 and 52 through 27 and the gas refrigerant communication pipe 7, the compressor 21 and the four-way switching valve 22 (not shown in FIG. 5) are connected to the compressor 21.
  • the high pressure gas pipe part E Including the part up to the outdoor heat exchanger 23 (hereinafter referred to as the high pressure gas pipe part E), the part of the outdoor heat exchanger 23 (that is, the condenser part A), and the outdoor heat exchanger of the liquid refrigerant circulation part B 23 to the subcooler 25 and the inlet half of the subcooler 25 on the main refrigerant circuit side (hereinafter referred to as the high temperature side liquid pipe portion B1) and the subcooler 25 in the liquid refrigerant circulation portion B.
  • the high pressure gas pipe part E the part of the outdoor heat exchanger 23 (that is, the condenser part A), and the outdoor heat exchanger of the liquid refrigerant circulation part B 23 to the subcooler 25 and the inlet half of the subcooler 25 on the main refrigerant circuit side (hereinafter referred to as the high temperature side liquid pipe portion B1) and the subcooler 25 in the liquid refrigerant circulation portion B.
  • the liquid side shut-off valve 26 not shown in FIG
  • liquid refrigerant communication pipe part B3 the liquid refrigerant flow Part B of the liquid refrigerant communication pipe 6
  • liquid refrigerant communication pipe part B3 and the liquid refrigerant communication pipe 6 of the liquid refrigerant circulation part B are expanded indoors.
  • the part up to the gas refrigerant communication pipe 7 (hereinafter referred to as the indoor unit F)
  • the gas refrigerant communication pipe 7 in the gas refrigerant circulation section D (hereinafter referred to as the gas refrigerant communication pipe section G) and the gas side shut-off valve 27 in the gas refrigerant circulation section D (shown in FIG. 5).
  • bypass circuit portion I a relational expression is set for each portion. Yes. Next, the relational expressions set for each part will be described.
  • the relational expression between the refrigerant amount Mogl in the high-pressure gas pipe E and the operating state quantity of the refrigerant or the component device flowing through the refrigerant circuit 10 is, for example,
  • This is expressed as a functional expression obtained by multiplying the volume Vogl of the high-pressure gas pipe E of the outdoor unit 2 by the refrigerant density / 0 d in the high-pressure gas pipe E.
  • the volume Vogl of the high-pressure gas pipe E is a known value of the front force at which the outdoor unit 2 is installed at the installation location, and is stored in advance in the memory of the control unit 8.
  • the density of the refrigerant in the high-pressure gas pipe E can be obtained by converting the discharge temperature Td and the discharge pressure Pd.
  • the outdoor temperature Ta, the condensation temperature Tc, the compressor discharge superheat SHm, the refrigerant circulation rate Wc, the saturated liquid density pc of the refrigerant in the outdoor heat exchanger 23, and the refrigerant density P at the outlet of the outdoor heat exchanger 23 It is expressed as a function expression of co.
  • the parameters kcl to kc7 in the above relational expression are obtained by regression analysis of the results of tests and detailed simulations, and are stored in the memory of the control unit 8 in advance.
  • the compressor discharge superheat degree S Hm is the refrigerant superheat degree on the discharge side of the compressor.
  • the discharge pressure Pd is converted to the refrigerant saturation temperature value, and the discharge temperature Td force is subtracted from the refrigerant saturation temperature value.
  • the saturated liquid density pc of the refrigerant is obtained by converting the condensation temperature Tc.
  • the refrigerant density p co at the outlet of the outdoor heat exchanger 23 is obtained by converting the condensation pressure Pc obtained by converting the condensation temperature Tc and the refrigerant temperature Tco.
  • the relational expression between the refrigerant amount Moll in the high-temperature liquid pipe section B1 and the operating state quantity of the refrigerant flowing through the refrigerant circuit 10 or the component device is, for example,
  • the volume Voll of the high-pressure liquid pipe section B1 is a known value of the front force at which the outdoor unit 2 is installed at the installation location, and is stored in the memory of the control section 8 in advance.
  • the relational expression between the refrigerant quantity Mol2 in the low temperature liquid pipe part B2 and the operating state quantity of the refrigerant flowing through the refrigerant circuit 10 or the component device is, for example,
  • the volume Vol2 of the cryogenic liquid pipe section B2 is a known value of the front force at which the outdoor unit 2 is installed at the installation location, and is stored in the memory of the control section 8 in advance.
  • the refrigerant density p lp in the low temperature liquid pipe section B2 is the output of the supercooler 25. It is the density of the refrigerant at the mouth, and is obtained by converting the condensation pressure Pc and the temperature Tip of the refrigerant at the outlet of the subcooler 25.
  • the relational expression between the refrigerant quantity Mr in the indoor unit F and the operating state quantity of the refrigerant or component equipment flowing through the refrigerant circuit 10 is, for example,
  • Mr krl XTlp + kr2 X AT + kr3 X SHr + kr4 XWr + kr5
  • the refrigerant temperature Tlp at the outlet of the supercooler 25 is expressed as a function expression of the air volume Wr.
  • the parameters krl to kr5 in the above relational expression are obtained by regression analysis of the results of the test and detailed simulation, and are stored in the memory of the control unit 8 in advance.
  • the relational expression of the refrigerant amount Mr is set corresponding to each of the two indoor units 4 and 5, and the refrigerant amount Mr of the indoor unit 4 and the refrigerant amount Mr of the indoor unit 5 are added. As a result, the total amount of refrigerant in the indoor unit F is calculated. If the indoor unit 4 and the indoor unit 5 have different models and capacities, the relational forces S with different values of the parameters krl to kr5 will be used.
  • the refrigerant density p gp in the gas refrigerant pipe connecting portion G is equal to the refrigerant density ps on the suction side of the compressor 21 and the outlets of the indoor heat exchangers 42 and 52 (that is, the inlet of the gas refrigerant connecting pipe 7). Average of refrigerant density p eo Value.
  • the refrigerant density ps is obtained by converting the suction pressure Ps and the suction temperature Ts, and the refrigerant density p eo is the conversion value of the evaporation temperature Te, the evaporation pressure Pe and the outlet temperatures Teo of the indoor heat exchangers 42 and 52. Is obtained by converting.
  • volume Vog2 of the low-pressure gas pipe H in the outdoor unit 2 is a known value of the pre-force that is shipped to the installation location, and is stored in the memory of the controller 8 in advance.
  • the relational expression between the refrigerant amount Mob in the no-pass circuit section I and the operation state quantity of the refrigerant flowing through the refrigerant circuit 10 or the component device is, for example,
  • Mob kobl X co + kob2 X ps + kob3 X Pe + kob4
  • the refrigerant density p co at the outlet of the outdoor heat exchanger 23, the refrigerant density p s at the outlet of the subcooler 25 on the bypass circuit side, and the evaporation pressure Pe are expressed as functional expressions.
  • the parameters kobl to kob3 in the above relational expression are obtained by regression analysis of the results of tests and detailed simulations, and are stored in the memory of the control unit 8 in advance.
  • the volume Mob of the bypass circuit part I may be smaller than the other parts, and may be calculated by a simpler relational expression. For example,
  • the volume Vob of the bypass circuit section I is also a known value of the front force at which the outdoor unit 2 is installed at the installation location, and is stored in the memory of the control section 8 in advance.
  • the saturated liquid density pe in the portion on the bypass circuit side of the subcooler 25 can be obtained by converting the suction pressure Ps or the evaporation temperature Te.
  • the number of the outdoor units 2 is one.
  • the refrigerant amounts relating to the outdoor units Mogl, Mc, Moll, Mol2, Mog2 And Mob, a relational expression of the refrigerant amount of each part is set corresponding to each of the plurality of outdoor units, and by adding the refrigerant amount of each part of the plurality of outdoor units, all refrigerants in the outdoor unit are added. The amount is calculated! /
  • the refrigerant flowing through the refrigerant circuit 10 in the refrigerant quantity determination operation or the operating state quantity of the component device is calculated.
  • the refrigerant amount of the refrigerant circuit 10 can be calculated.
  • step S12 Since this step S12 is repeated until the condition for determining whether or not the refrigerant amount is appropriate in step S13, which will be described later, is satisfied, the additional charging of the refrigerant is started and the power is completed until the power is completed.
  • the amount of operating state force when the refrigerant is charged is calculated. More specifically, the refrigerant amount Mo in the outdoor unit 2 and the refrigerant amount Mr in each of the indoor units 4 and 5 necessary for determining whether or not the refrigerant amount is appropriate in step S 13 described later (that is, the refrigerant communication pipe 6,
  • the refrigerant amount of each part of the refrigerant circuit 10 excluding 7 is calculated.
  • the refrigerant quantity Mo in the outdoor unit 2 is calculated by calculating the power of the refrigerant quantities Mogl, Mc, Moll, Mol2, Mog2 and Mob in each part in the outdoor unit 2 described above. .
  • control unit 8 that functions as the refrigerant amount calculating means for calculating the refrigerant amount of each part of the refrigerant circuit 10 from the refrigerant flowing in the refrigerant circuit 10 or the operating state quantity of the component device in the refrigerant automatic charging operation, performs step S. 12 processes are performed.
  • the refrigerant amount in the refrigerant circuit 10 gradually increases.
  • the amount of refrigerant to be charged in the refrigerant circuit 10 after additional charging of the refrigerant is calculated as the total amount of refrigerant that is the refrigerant amount of the entire refrigerant circuit 10. Cannot be specified as Mt.
  • the optimal refrigerant amount of the outdoor unit 2 is confirmed through tests and detailed simulations.
  • this refrigerant amount is stored in advance in the memory of the control unit 8 as the target charging amount Ms, and the refrigerant is obtained using the above-described relational expression.
  • step S13 determines whether or not the amount of refrigerant charged in the refrigerant circuit 10 by additional charging of the refrigerant by determining whether or not the refrigerant amount Mu in the unit in the automatic refrigerant charging operation has reached the target charging amount Ms. It is a process to determine.
  • step S13 when the refrigerant amount Mu in the unit is smaller than the target charging amount Ms and the additional charging of the refrigerant is not completed, the process of step S13 is performed until the target charging amount Ms is reached. Is repeated.
  • the display unit 9b displays that the additional charging of the refrigerant is completed, stops the supply of the refrigerant from the refrigerant cylinder, Step S1 as the automatic refrigerant charging operation process is completed.
  • the refrigerant which is one of the refrigerant amount determination means, determines whether or not the refrigerant amount in the refrigerant circuit 10 in the refrigerant amount determination operation of the automatic refrigerant charging operation is appropriate (that is, whether or not the target charging amount Ms has been reached).
  • the process of step S13 is performed by the control unit 8 functioning as an automatic filling determination unit.
  • the automatic refrigerant charging operation causes the refrigerant circuit 10 to enter the refrigerant circuit 10 before the automatic refrigerant charging operation (that is, the refrigerant amount previously charged in the outdoor unit 2). ) Is added to the initial charge amount Mi and the additional charge amount Ma, which is the additional charge amount, is added to the total charge refrigerant amount Mt, which is the refrigerant amount.
  • Step S2 Pipe volume calculation
  • FIG. 6 is a flowchart of the pipe volume calculation process. (Steps S21 and S22: Store data during automatic refrigerant charging operation and input additional charging amount)
  • Step S21 the density of the refrigerant flowing through the refrigerant communication pipes 6 and 7 in step S23 described later can be calculated.
  • the operation data during the above-described automatic refrigerant charging operation is stored in the memory of the control unit 8.
  • the data stored in the memory of the control unit 8 includes the condensing pressure Pc necessary for calculating the refrigerant density p lp in the liquid refrigerant communication pipe unit B3 and the refrigerant temperature at the outlet of the subcooler 25.
  • Tip and refrigerant density in gas refrigerant communication pipe section H The suction pressure Ps, suction temperature Ts, evaporation pressure Pe, outlet temperature Teo required for calculation of gp, and the amount of refrigerant in the unit when the automatic refrigerant charging operation is completed There is Mu.
  • step S22 the additional charging amount Ma or the value of the total charged refrigerant amount Mt including the additional charging amount Ma is input to the memory of the control unit 8 through the input unit 9a.
  • the additional charging amount Ma is a value of the refrigerant amount obtained by the force change of the refrigerant cylinder in the automatic refrigerant charging operation, and is controlled by the operator of additional charging through the input unit 9a provided in the control unit 8. Manually input to the memory of the unit 8, or connect a scale for measuring the change in the weight of the refrigerant cylinder to the control unit 8 as the input unit 9a so that it is automatically input to the memory of the control unit 8. Good.
  • processing of these steps S21 and S22 is performed in the processing of the pipe volume calculation here, but may be performed in the processing of the automatic refrigerant charging operation described above.
  • Step S23 First, the initial amount of refrigerant that has been charged in the refrigerant circuit 10 before the automatic refrigerant charging operation is obtained.
  • the additional charging amount Ma input to the control unit 8 in step S22 to the charging amount Mi, a total charging refrigerant amount Mt that is the refrigerant amount of the entire refrigerant circuit 10 immediately after the automatic refrigerant charging operation is obtained.
  • the initial filling amount Mi is stored in the memory of the control unit 8.
  • the refrigerant amount in the refrigerant communication pipes 6 and 7 is obtained.
  • the communication pipe refrigerant amount Mp is obtained.
  • step S23 based on the condensation pressure Pc stored in the control unit 8 in step S21 and the refrigerant temperature Tip at the outlet of the subcooler 25, the liquid at the time of the automatic refrigerant charging operation is determined.
  • the liquid refrigerant density p lp flowing in the refrigerant communication pipe B3 (that is, the liquid refrigerant communication pipe 6) is obtained, and the suction pressure Ps stored in the control unit 8 in step S21 is reduced.
  • the density of the gas refrigerant p gp flowing in the gas refrigerant communication pipe H (that is, the gas refrigerant communication pipe 7) during the automatic refrigerant charging operation is obtained.
  • the calculation of the density p ip p gp is the same as the density p lp and p gp in the calculation of the refrigerant amount in step S12 of the automatic refrigerant charging operation described above, and the description thereof is omitted here).
  • step S24 based on the communication pipe refrigerant amount Mp and density p lp, p gp obtained in step S23, the volume of the refrigerant communication pipes 6 and 7 (more specifically, the volume Vlp and Calculate the volume (Vgp) of the gas refrigerant communication pipe.
  • the liquid refrigerant communication pipe 6 and the gas refrigerant communication pipe 7 are provided so as to connect the indoor units 4 and 5 and the outdoor unit 2, the pipe lengths are almost the same, and the density of the refrigerant flowing in the pipes is different. Therefore, the pipe diameter, that is, the flow path cross-sectional area is different. Therefore, the volume ratio between the liquid refrigerant communication pipe 6 and the gas refrigerant communication pipe 7 (in the following explanation, the value obtained by dividing the gas refrigerant communication pipe Vgp by the volume Vlp of the liquid refrigerant communication pipe 6 is VgpZVlp as the volume ratio RV.
  • the ratio Rv is a value within a certain range.
  • the volume Vlp of the liquid refrigerant communication pipe 6 is multiplied by the liquid refrigerant density p lp as follows: The sum of the value and the volume of the gas refrigerant communication pipe 7 multiplied by the gas refrigerant density p gp is equal to the communication pipe refrigerant amount Mp.
  • Vlp X lp + Vgp X p gp Vlp X lp + (Vlp XRv) X p gp
  • Vlp Mp / (lp + RvX gp)
  • Vgp Vlp XRv
  • the volume ratio Rv between the liquid refrigerant communication pipe 6 and the gas refrigerant communication pipe 7 is set to a value corresponding to the capacity and type of the indoor units 4 and 5 and the outdoor unit 2 in advance.
  • the refrigerant communication pipes 6, 7 (More specifically, the volume Vlp of the liquid refrigerant communication pipe 6 and the volume Vgp of the gas refrigerant communication pipe 6) are calculated.
  • FIG. 7 is a flowchart of the refrigerant leak detection operation mode.
  • Step S31 Refrigerant amount judgment operation
  • the refrigerant leak detection operation mode is automatically or manually changed from the normal operation mode.
  • the refrigerant quantity judgment operation including the indoor unit total number operation, the condensation pressure control, the liquid pipe temperature control, the superheat degree control, and the evaporation pressure control is performed.
  • the liquid pipe temperature target value Tlps in the liquid pipe temperature control, the superheat degree target value SHrs in the superheat degree control, and the low pressure target value Pes in the evaporation pressure control are, in principle, the refrigerant amount judgment operation of the automatic refrigerant charging operation. The same value as the target value in step S11 is used.
  • This refrigerant quantity determination operation is performed for each refrigerant leakage detection operation.For example, if the condensation pressure Pc is different, refrigerant leakage occurs! Even when the refrigerant temperature Tco fluctuates at the outlet of the outdoor heat exchanger 23 due to the liquid pipe temperature control, the refrigerant temperature in the liquid refrigerant communication pipe 6 is the same as the liquid pipe temperature. The target value Tips will be kept constant.
  • control unit 8 functioning as the refrigerant amount determination operation control means for performing the refrigerant amount determination operation including the indoor unit total number operation, the condensation pressure control, the liquid pipe temperature control, the superheat degree control, and the evaporation pressure control. Then, the process of step S31 is performed.
  • control unit 8 that functions as the refrigerant quantity calculation means while performing the refrigerant quantity determination operation described above, the refrigerant from the operating state quantity of the refrigerant flowing through the refrigerant circuit 10 or the component device in the refrigerant leakage detection operation in step S32.
  • the refrigerant amount in the refrigerant circuit 10 is calculated using a relational expression between the refrigerant amount of each part of the refrigerant circuit 10 and the operation state quantity of the refrigerant flowing through the refrigerant circuit 10 or the component device.
  • the volume Vlp and Vgp of the refrigerant communication pipes 6 and 7 that were unknown after the installation of the components of the air conditioner 1 are calculated and known by the pipe volume calculation process described above.
  • the refrigerant amounts Mlp and Mgp in the refrigerant communication pipes 6 and 7 are calculated, and the refrigerant quantities in the other parts are further calculated.
  • the refrigerant amount of the entire refrigerant circuit 10 (hereinafter referred to as total calculated refrigerant amount M) is calculated. It can be calculated.
  • the liquid refrigerant communication pipe section The refrigerant amount Mlp in B3 is kept constant even when the refrigerant temperature Tco fluctuates at the outlet of the outdoor heat exchanger 23, regardless of the operating conditions of the refrigerant leak detection operation.
  • control unit 8 that functions as the refrigerant amount calculating means for calculating the refrigerant amount of each part of the refrigerant circuit 10 from the refrigerant flowing in the refrigerant circuit 10 or the operation state quantity of the component device in the refrigerant leakage detection operation causes the step S32 Is performed.
  • Steps S33, S34 Judgment of suitability of refrigerant amount, warning display
  • the total calculated refrigerant amount M calculated in step S32 described above is the refrigerant amount of the entire refrigerant circuit 10 immediately after completion of the automatic refrigerant charging operation in the case where refrigerant leakage from the refrigerant circuit 10 occurs.
  • the total refrigerant quantity M is smaller than the total refrigerant quantity M, which is the reference refrigerant quantity for determining whether or not there is refrigerant leakage, and there is no refrigerant leakage from the refrigerant circuit 10, the total refrigerant quantity Mt And almost the same value.
  • step S33 it is determined whether or not refrigerant has leaked. If it is determined in step S33 that no refrigerant leaks from the refrigerant circuit 10, the refrigerant leakage detection operation mode is terminated.
  • step S33 if it is determined in step S33 that refrigerant has leaked from the refrigerant circuit 10, the process proceeds to step S34, and a warning is displayed on the display unit 9b to notify that refrigerant leakage has been detected. Then, the refrigerant leakage detection operation mode is terminated.
  • the refrigerant amount determination means for detecting the presence or absence of refrigerant leakage by determining whether or not the refrigerant amount in the refrigerant circuit 10 is appropriate while performing the refrigerant amount determination operation in the refrigerant leakage detection operation mode.
  • the processing of steps S32 to S34 is performed by the control unit 8 that functions as one refrigerant leakage detection means.
  • control unit 8 functions as the refrigerant amount determination operation unit, the refrigerant amount calculation unit, the refrigerant amount determination unit, and the pipe volume calculation unit.
  • a refrigerant quantity determination system for determining the suitability of the refrigerant quantity charged in the circuit 10 is configured.
  • the air conditioner 1 of the present embodiment has the following features.
  • the amount of refrigerant that is additionally charged after the outdoor unit 2 and the indoor units 4 and 5 are connected via the refrigerant communication pipes 6 and 7 to form the refrigerant circuit 10 is added. Since the volume of the refrigerant communication pipes 6 and 7 is calculated based on the filling quantity Ma, the value of the additional filling quantity Ma is entered even if the volume of the refrigerant communication pipes 6 and 7 is unknown. By applying force, the volume of the refrigerant communication pipes 6 and 7 can be calculated.
  • the volume of the refrigerant communication pipes 6 and 7 while minimizing the effort to input the information of the refrigerant communication pipes 6 and 7, and as a result, whether or not the amount of refrigerant in the refrigerant circuit 10 is appropriate. More specifically, the presence or absence of refrigerant leakage from the refrigerant circuit 10 can be determined with high accuracy.
  • the automatic refrigerant charging operation for determining whether the force has reached the target charging amount Ms can be performed based on the operating state quantity of the refrigerant flowing through the refrigerant circuit 10 or the component device. Therefore, it is possible to reliably perform the additional charging of the refrigerant, and to obtain the value of the additional charging amount Ma required for calculating the volume of the refrigerant communication pipes 6 and 7 by performing the automatic refrigerant charging operation. Can do.
  • the total amount obtained by adding the additional charging amount Ma to the initial charging amount Mi that is the amount of refrigerant charged in the refrigerant circuit 10 before the automatic refrigerant charging operation is the amount of refrigerant charged in the refrigerant circuit 10 before the automatic refrigerant charging operation.
  • the refrigerant amount Mu in the unit calculated from the refrigerant flowing through the refrigerant circuit 10 in the automatic refrigerant charging operation or the operating state quantity of the component equipment from the charged refrigerant quantity Mt, the communication pipe refrigerant quantity during the automatic refrigerant charging operation Since Mp can be calculated with high accuracy, the volume of the refrigerant communication pipes 6 and 7 can be calculated with high accuracy.
  • the volume ratio Rv between the liquid refrigerant communication pipe 6 and the gas refrigerant communication pipe 7 is set in advance as a value corresponding to the capacity and type of the indoor units 4 and 5 and the outdoor unit 2.
  • the volume Vlp of the liquid refrigerant communication pipe 6 and the volume Vgp of the gas refrigerant communication pipe 7 can be calculated easily.
  • the communication pipe necessary for calculating the volume of the refrigerant communication pipes 6 and 7 The refrigerant amount Mp is determined from the refrigerant flowing in the refrigerant circuit 10 or the operating state quantity of the component device in the automatic refrigerant charging operation, and the refrigerant quantity in the unit.
  • the force obtained by calculating Mu and subtracting the in-unit refrigerant amount Mu obtained by calculation from the total charged refrigerant amount Mt.Refrigerant Refrigerant In the refrigerant circuit 10 before the automatic charging operation (that is, Refrigerant amount in refrigerant circuit 10 by automatic refrigerant charging operation in indoor units 4, 5 and outdoor unit 2) shipped to the installation site
  • Refrigerant amount in refrigerant circuit 10 by automatic refrigerant charging operation in indoor units 4, 5 and outdoor unit 2 shipped to the installation site
  • an amount of refrigerant that approximates the in-unit refrigerant amount Mu can be charged as the initial filling amount Mi.
  • the additional charge amount Ma which is the amount of refrigerant additionally charged in the refrigerant circuit 10 in the automatic refrigerant charging operation, is used as the refrigerant.
  • the refrigerant amount Mu in the unit and the total charged refrigerant amount Mt are used, because the communication pipe can be regarded as corresponding to the refrigerant quantity Mp, which is the refrigerant quantity existing in the communication pipes 6 and 7. Therefore, it is not necessary to calculate the communication pipe refrigerant amount Mp, so the volume of the refrigerant communication pipes 6 and 7 can be calculated easily.
  • the refrigerant automatic operation is performed in the refrigerant circuit 10 before the automatic refrigerant charging operation (that is, in the indoor units 4 and 5 and the outdoor unit 2 shipped to the installation site).
  • the amount of refrigerant in the refrigerant circuit 10 reaches the target charging amount Ms by the charging operation, an amount of refrigerant different from the amount corresponding to the refrigerant amount Mu in the unit is filled as the initial charging amount Mi.
  • various conditions of the initial filling quantity Mi are obtained. In this case, it is possible to obtain an accurate communication pipe refrigerant amount Mp in the case of the refrigerant and calculate the volume of the refrigerant communication pipes 6 and 7 with high accuracy.
  • the present invention is applied to an air conditioner capable of switching between cooling and heating.
  • the present invention is not limited to this, and other air conditioners such as a cooling-only air conditioner.
  • the present invention may be applied to.
  • the example in which the present invention is applied to the air conditioner including one outdoor unit has been described.
  • the present invention is not limited to this, and the air conditioner includes a plurality of outdoor units.
  • the present invention may be applied to an apparatus.
  • the suitability of the refrigerant amount in the refrigerant circuit can be determined with high accuracy while reducing the effort of inputting information of the refrigerant communication pipe before the operation of the separate type air conditioner as much as possible. It is to be able to be determined.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

Cette invention concerne un climatiseur de type séparé dans lequel le processus de saisie des informations sur la conduite de transfert de réfrigérant avant de lancer la mise en marche du climatiseur est réduit autant que possible et dans lequel il est possible de déterminer très précisément si la quantité de réfrigérant dans un circuit de réfrigérant est adaptée ou non. Le climatiseur (1) comprend le circuit de réfrigérant (10) formé par raccordement d'une unité source de chaleur (2) et d'unités fonctionnelles (4, 5) par l'intermédiaire des conduites de transfert de réfrigérant (6, 7), ainsi qu'un moyen permettant de calculer le volume de la conduite. Le moyen de calcul du volume de la conduite calcule les volumes (Vlp, Vgp) de la conduite de transfert de réfrigérant (6, 7) sur la base d'une quantité de remplissage supplémentaire (Ma), c'est-à-dire de la quantité de réfrigérant ajoutée après assemblage du circuit de réfrigérant (10) par raccordement de l'unité source de chaleur (2) et des unités fonctionnelles (4,5) par l'intermédiaire de la conduite de transfert de réfrigérant (6, 7).
PCT/JP2007/062589 2006-06-26 2007-06-22 Climatiseur Ceased WO2008001687A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN2007800233194A CN101473177B (zh) 2006-06-26 2007-06-22 空调装置
KR1020087031615A KR101207004B1 (ko) 2006-06-26 2007-06-22 공기 조화 장치
US12/304,883 US20090100849A1 (en) 2006-06-26 2007-06-22 Air conditioner
EP07767400.0A EP2034261A4 (fr) 2006-06-26 2007-06-22 Climatiseur
AU2007264431A AU2007264431B2 (en) 2006-06-26 2007-06-22 Air conditioner

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Application Number Priority Date Filing Date Title
JP2006175083A JP4155313B2 (ja) 2006-06-26 2006-06-26 空気調和装置
JP2006-175083 2006-06-26

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WO2008001687A1 true WO2008001687A1 (fr) 2008-01-03

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EP (1) EP2034261A4 (fr)
JP (1) JP4155313B2 (fr)
KR (1) KR101207004B1 (fr)
CN (1) CN101473177B (fr)
AU (1) AU2007264431B2 (fr)
WO (1) WO2008001687A1 (fr)

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EP2034261A1 (fr) 2009-03-11
US20090100849A1 (en) 2009-04-23
EP2034261A4 (fr) 2014-07-30
KR20090027223A (ko) 2009-03-16
AU2007264431B2 (en) 2010-04-29
CN101473177B (zh) 2011-01-26
JP4155313B2 (ja) 2008-09-24
JP2008002786A (ja) 2008-01-10
CN101473177A (zh) 2009-07-01
KR101207004B1 (ko) 2012-11-30
AU2007264431A1 (en) 2008-01-03

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