WO2016113830A1 - Dispositif de climatisation - Google Patents

Dispositif de climatisation Download PDF

Info

Publication number
WO2016113830A1
WO2016113830A1 PCT/JP2015/050574 JP2015050574W WO2016113830A1 WO 2016113830 A1 WO2016113830 A1 WO 2016113830A1 JP 2015050574 W JP2015050574 W JP 2015050574W WO 2016113830 A1 WO2016113830 A1 WO 2016113830A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat medium
heat
refrigerant
unit
medium flow
Prior art date
Application number
PCT/JP2015/050574
Other languages
English (en)
Japanese (ja)
Inventor
祐治 本村
Original Assignee
三菱電機株式会社
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 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to GB1710186.6A priority Critical patent/GB2548522B/en
Priority to JP2016569138A priority patent/JP6429901B2/ja
Priority to PCT/JP2015/050574 priority patent/WO2016113830A1/fr
Publication of WO2016113830A1 publication Critical patent/WO2016113830A1/fr

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
    • F24F3/08—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with separate supply and return lines for hot and cold heat-exchange fluids i.e. so-called "4-conduit" system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
    • F24F3/065—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with a plurality of evaporators or condensers
    • 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
    • F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
    • F25B25/005—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00 using primary and secondary 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
    • F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
    • F25B29/003—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the compression type system
    • 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
    • F25B2313/004—Outdoor unit with water as a heat sink or heat source
    • 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
    • F25B2313/006—Compression machines, plants or systems with reversible cycle not otherwise provided for two pipes connecting the outdoor side to the indoor side with multiple indoor units
    • 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
    • F25B2313/0231—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units with simultaneous cooling and heating
    • 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
    • F25B2313/0272—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using bridge circuits of one-way valves
    • 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
    • F25B2313/02743—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using three four-way valves
    • 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
    • F25B2500/05—Cost reduction

Definitions

  • the present invention relates to an air conditioner applied to, for example, a building multi air conditioner.
  • an air conditioner such as a multi air conditioning system for buildings
  • a refrigerant such as water is circulated from an outdoor unit to a relay unit
  • a heat medium such as water is circulated from the relay unit to the indoor unit.
  • An air conditioning apparatus has been proposed that reduces the conveyance power of the heat medium while circulating the air (see, for example, Patent Document 1).
  • the present invention has been made to solve the above-described problems, and an object of the present invention is to provide an air conditioner that can cope with an increase in the number of indoor units connected at a low cost.
  • An air conditioner according to the present invention is a refrigerant in which a refrigerant, a heat source side refrigerant circulates by connecting refrigerant side flow paths of a compressor, a heat source side heat exchanger, a first expansion device, and a plurality of heat exchangers between heat mediums with a refrigerant pipe.
  • a heat medium circulation circuit in which a heat medium circulates by connecting a circulation circuit, a heat medium side flow path of a plurality of heat exchangers between heat mediums, a plurality of heat medium conveying devices, and a plurality of use side heat exchangers with a heat medium pipe And a flow path of the heat medium provided to correspond to each of the plurality of use side heat exchangers in the heat medium circulation circuit, and to connect the use side heat exchanger to any of the plurality of heat exchangers between heat mediums
  • a first heat medium flow switching means that switches between, and a relay unit that includes a plurality of heat exchangers between heat media, and to which a plurality of use side heat exchangers are connected via the plurality of first heat medium flow switching means
  • connection port for connecting the branch unit of the second through a connection pipe, connected to the connection part through which the heat medium of the heat medium circulation circuit passes, and one or a plurality of additional use side heat exchangers, and connected via the connection part.
  • a branch section for branching the heat medium flowing into the branch unit and circulating it to one or a plurality of additional use side heat exchangers, and one or a plurality of additional use side heat exchangers.
  • each of the plurality of additional use side heat exchangers is provided with second heat medium flow switching means for connecting to any of the plurality of heat exchangers related to heat medium.
  • FIG. 1 is a schematic diagram illustrating an installation example of an air conditioner 100 according to an embodiment of the present invention.
  • an air conditioner 100 according to the present embodiment includes an outdoor unit (heat source unit) 1, a plurality of indoor units 3, and an intervening unit 1 between the outdoor unit 1 and the indoor unit 3. And a relay unit 2 as a base.
  • each indoor unit 3 can select a cooling operation or a heating operation.
  • the operation modes executed by the air conditioning apparatus 100 include the following four operation modes.
  • the relay unit 2 performs heat exchange between the heat source side refrigerant and the heat medium.
  • the outdoor unit 1 and the relay unit 2 are connected by a refrigerant pipe 4 through which the heat source side refrigerant flows, and constitute a refrigerant circulation circuit A that is a refrigeration cycle for circulating the heat source side refrigerant.
  • the relay unit 2 and the indoor unit 3 are connected by a heat medium pipe 5 through which the heat medium flows, and constitute a heat medium circulation circuit B that circulates the heat medium.
  • each component such as a switching apparatus connected to each of the refrigerant circuit A and the heat medium circuit B, will be described below again.
  • the cold or warm heat generated by the outdoor unit 1 is delivered to the indoor unit 3 via the relay unit 2.
  • the air conditioner 100 is characterized in that it is possible to increase the number of indoor units 3 connected, and the relay unit 2 is connected to the heat medium branching circuit B in the heat medium circulation circuit B.
  • a branch unit 60 that increases the number of units connected to the indoor units 3 and is connected is connected.
  • the relay unit 2 includes a connection port 2 a (see FIG. 2 described later) for connecting the branch unit 60, and the branch unit 60 is connected to the connection port 2 a via a connection pipe 70.
  • the outdoor unit 1, the relay unit 2, and the indoor unit 3 will be described, and the branch unit 60 will be described later.
  • the outdoor unit 1 is normally disposed in an outdoor space 6 that is a space outside a building 9 such as a building (for example, a rooftop), and supplies cold or hot heat to the indoor unit 3 via the relay unit 2. .
  • the relay unit 2 transmits the heat or cold generated by the outdoor unit 1 to the indoor unit 3.
  • the relay unit 2 is configured as a separate housing from the outdoor unit 1 and the indoor unit 3 so as to be installed at a position different from the outdoor space 6 and the indoor space 7.
  • the relay unit 2 is connected to the outdoor unit 1 through the refrigerant pipe 4 and is connected to the indoor unit 3 through the heat medium pipe 5.
  • the indoor unit 3 is disposed at a position where cooling air or heating air can be supplied to the indoor space 7 that is a space (for example, a living room) inside the building 9, and the cooling air is supplied to the indoor space 7 that is the air-conditioning target space. Alternatively, heating air is supplied.
  • the indoor unit 3 is a ceiling-embedded type, but is not limited thereto.
  • the heat source side refrigerant is conveyed from the outdoor unit 1 to the relay unit 2 through the refrigerant pipe 4.
  • the conveyed heat source side refrigerant exchanges heat with the heat medium in the heat exchanger related to heat medium 25 (see FIG. 2) described later in the relay unit 2 to heat or cool the heat medium. That is, the heat medium is heated or cooled by the heat exchanger related to heat medium to become hot water or cold water.
  • Hot water or cold water produced by the relay unit 2 is conveyed to the indoor unit 3 via the heat medium pipe 5 by a pump 31 (see FIG. 2) described later, and the indoor unit 3 performs heating operation on the indoor space 7. Or it is used for cooling operation.
  • heat source side refrigerant for example, a single refrigerant such as R-22 and R-134a, a pseudo azeotropic refrigerant mixture such as R-410A and R-404A, and a non-azeotropic refrigerant mixture such as R-407C can be used.
  • a heat source side refrigerant for example, a refrigerant containing a double bond in a chemical formula and having a relatively low global warming potential such as CF 3 or CF ⁇ CH 2 and a mixture thereof can be used.
  • natural refrigerants such as CO 2 or propane can be used as the heat source side refrigerant.
  • the heat medium for example, water, brine (antifreeze), a mixture of water and antifreeze, a mixture of water and an additive having a high anticorrosive effect, or the like can be used. That is, the air conditioning apparatus 100 contributes to the improvement of the safety
  • the air conditioning apparatus 100 according to the present embodiment will be described assuming that water is employed as the heat medium.
  • an air conditioner 100 includes an outdoor unit 1 and a relay unit 2 connected using two refrigerant pipes 4, and the relay unit 2 and each indoor unit 3 are connected to each other.
  • Two heat medium pipes 5 are used for connection.
  • the construction is performed by connecting each unit (the outdoor unit 1, the relay unit 2, and the indoor unit 3) using two pipes (the refrigerant pipe 4 and the heat medium pipe 5). It has become easy.
  • the relay unit 2 is installed in a space such as the back of the ceiling (hereinafter simply referred to as a space 8) that is inside the building 9 but is different from the indoor space 7.
  • a space 8 such as the back of the ceiling
  • the relay unit 2 can also be installed in a common space where there is an elevator or the like.
  • FIG. 1 shows an example in which the indoor unit 3 is a ceiling cassette type, but the present invention is not limited to this, and the indoor unit 3 is not directly limited to the indoor space 7 such as a ceiling embedded type or a ceiling suspended type.
  • any type of air can be used as long as heating air or cooling air can be blown out by a duct or the like.
  • FIG. 1 shows an example in which the outdoor unit 1 is installed in the outdoor space 6, but the present invention is not limited to this.
  • the outdoor unit 1 may be installed in an enclosed space such as a machine room with a ventilation opening. If the waste heat can be exhausted outside the building 9 by an exhaust duct, the outdoor unit 1 may be installed inside the building 9. May be installed. Also, when the water-cooled outdoor unit 1 is used, the outdoor unit 1 may be installed inside the building 9. Even if the outdoor unit 1 is installed in such a place, no particular problem occurs.
  • the relay unit 2 may be installed in the vicinity of the outdoor unit 1. However, when the relay unit 2 is installed in the vicinity of the outdoor unit 1 in this way, it is preferable to pay attention to the length of the heat medium pipe 5 that connects the relay unit 2 to the indoor unit 3. This is because if the distance from the relay unit 2 to the indoor unit 3 is increased, the heat transfer power of the heat medium is increased correspondingly, and the energy saving effect is reduced.
  • the number of connected outdoor units 1, relay units 2, and indoor units 3 is not limited to the number illustrated in FIG. 1, and the number may be determined according to the building 9 in which the air conditioner 100 is installed. That's fine.
  • the plurality of relay units 2 When a plurality of relay units 2 are connected to one outdoor unit, the plurality of relay units 2 can be installed in a common space in a building such as a building or in a space such as a ceiling. By doing so, the air-conditioning load can be covered by the heat exchangers 25a and 25b (see FIG. 2) described later in each relay unit 2. Further, the indoor unit 3 can be installed at a distance or height within the allowable transport range of the pumps 31a and 31b (see FIG. 2) in each relay unit 2, and the whole unit such as a building can be installed. Placement is possible.
  • FIG. 2 is a diagram illustrating an example of circuit configurations of the outdoor unit 1 and the relay unit 2 in the air-conditioning apparatus 100 according to the embodiment of the present invention.
  • the outdoor unit 1 and the relay unit 2 are connected by the refrigerant pipe 4 via the heat exchangers 25 a and 25 b provided in the relay unit 2.
  • the relay unit 2 and the indoor unit 3 are connected by the heat medium piping 5 via the heat exchangers 25a and 25b.
  • the heat exchangers 25 a and 25 b exchange heat between the heat source side refrigerant supplied via the refrigerant pipe 4 and the heat medium supplied via the heat medium pipe 5.
  • Outdoor unit 1 In the outdoor unit 1, a compressor 10, a first refrigerant flow switching device 11 such as a four-way valve, a heat source side heat exchanger 12, and an accumulator 19 are connected and mounted via a refrigerant pipe 4.
  • the outdoor unit 1 is provided with a first connection pipe 4a, a second connection pipe 4b, and check valves 13a to 13d.
  • the air conditioner 100 can be connected from the outdoor unit 1 to the relay unit 2 regardless of the heating operation mode or the cooling operation mode.
  • the flow of the heat source side refrigerant to be introduced can be set in a certain direction.
  • the compressor 10 sucks the refrigerant, compresses the refrigerant to a high temperature and high pressure state, and conveys the refrigerant to the refrigerant circuit A.
  • the compressor 10 has a discharge side connected to the first refrigerant flow switching device 11 and a suction side connected to an accumulator 19.
  • the compressor 10 may be composed of, for example, an inverter compressor capable of capacity control.
  • the first refrigerant flow switching device 11 includes a discharge side of the compressor 10, a check valve 13d, a heat source side heat exchanger 12, and an accumulator in the heating only operation mode and the heating main operation mode of the mixed heating and cooling operation mode. 19 is connected to the suction side.
  • the first refrigerant flow switching device 11 connects the discharge side of the compressor 10 and the heat source side heat exchanger 12 in the cooling operation mode and the cooling main operation mode of the mixed heating and cooling operation mode, and performs a check.
  • the valve 13c and the suction side of the accumulator 19 are connected.
  • the heat source side heat exchanger 12 functions as an evaporator during heating operation, and functions as a condenser (or radiator) during cooling operation.
  • the heat source side heat exchanger 12 exchanges heat between an air fluid supplied from a blower such as a fan (not shown) and the heat source side refrigerant, and evaporates or condenses the heat source side refrigerant. It is.
  • One side of the heat source side heat exchanger 12 is connected to the check valve 13b and the other side is connected to the suction side of the accumulator 19 in the heating operation mode.
  • one of the heat source side heat exchangers 12 is connected to the discharge side of the compressor 10 and the other is connected to the check valve 13a.
  • the heat source side heat exchanger 12 may be configured by, for example, a plate fin and tube heat exchanger that can exchange heat between the refrigerant flowing through the refrigerant pipe and the air passing through the fins.
  • the accumulator 19 stores surplus refrigerant due to a difference in required refrigerant amount between the heating operation mode and the cooling operation mode, and surplus refrigerant with respect to a transient operation change (for example, a change in the number of operating indoor units 3). is there.
  • the accumulator 19 has a suction side connected to the heat source side heat exchanger 12 and a discharge side connected to the suction side of the compressor 10 in the heating operation mode.
  • the accumulator 19 is connected to the check valve 13c on the suction side and connected to the suction side of the compressor 10 in the cooling operation mode.
  • the check valve 13a is provided in the refrigerant pipe 4 between the heat source side heat exchanger 12 and the relay unit 2, and flows the heat source side refrigerant only in a predetermined direction (direction from the outdoor unit 1 to the relay unit 2). It is acceptable.
  • the check valve 13c is provided in the refrigerant pipe 4 between the relay unit 2 and the first refrigerant flow switching device 11, and the heat source side refrigerant is only in a predetermined direction (direction from the relay unit 2 to the outdoor unit 1). It allows flow.
  • the check valve 13b is provided in the second connection pipe 4b and circulates the heat source side refrigerant returned from the relay unit 2 during the heating operation to the suction side of the compressor 10.
  • the check valve 13d is provided in the first connection pipe 4a, and causes the heat source side refrigerant discharged from the compressor 10 to flow through the relay unit 2 during the heating operation.
  • the first connection pipe 4 a includes a refrigerant pipe 4 between the first refrigerant flow switching device 11 and the check valve 13 c and a refrigerant pipe 4 between the check valve 13 a and the relay unit 2.
  • the second connection pipe 4b includes a refrigerant pipe 4 between the check valve 13c and the relay unit 2, a refrigerant pipe 4 between the heat source side heat exchanger 12 and the check valve 13a, Are connected.
  • FIG. 2 shows an example in which the first connection pipe 4a, the second connection pipe 4b, the check valve 13a, the check valve 13b, the check valve 13c, and the check valve 13d are provided.
  • the present invention is not limited to this, and these are not necessarily provided.
  • the indoor unit 3 includes use side heat exchangers 35a to 35d (also simply referred to as use side heat exchangers 35).
  • the use side heat exchanger 35 includes heat medium flow rate adjusting devices 34 a to 34 d (also simply referred to as a heat medium flow rate adjusting device 34) via the heat medium pipe 5 and the second heat heat pipe 35 via the heat medium pipe 5.
  • the medium flow switching devices 33a to 33d (also simply referred to as the second heat medium flow switching device 33) are connected.
  • the use side heat exchanger 35 exchanges heat between air supplied from a blower such as a fan (not shown) and a heat medium, and generates heating air or cooling air to be supplied to the indoor space 7. To do.
  • FIG. 2 shows an example in which four indoor units 3 a to 3 d are connected to the relay unit 2 via the heat medium pipe 5.
  • the use side heat exchanger 35 also includes a use side heat exchanger 35a, a use side heat exchanger 35b, a use side heat exchanger 35c, and a use side heat exchanger 35d from the upper side of the drawing. To do.
  • the number of indoor units 3 connected is not limited to four.
  • the relay unit 2 includes two heat medium heat exchangers 25a and 25b (sometimes simply referred to as the heat medium heat exchanger 25) and two first expansion devices 26a and 26b (only the first expansion device 26). 2), two opening / closing devices 27, 29, and two second refrigerant flow switching devices 28a, 28b (sometimes simply referred to as second refrigerant flow switching device 28). ing.
  • the relay unit 2 further includes two heat medium transfer devices, pumps 31a and 31b (sometimes simply referred to as pump 31), and four first heat medium flow switching devices 32a to 32d (simply referred to as first heat medium).
  • the first heat medium flow switching device 32, the second heat medium flow switching device 33, and the heat medium flow control device 34 constitute the first heat medium flow switching means of the present invention.
  • the first heat medium flow switching devices 32a to 32d, the second heat medium flow switching devices 33a to 33d, and the heat medium flow control devices 34a to 34d are integrated flow channel switching that unifies the functions of these switching devices. It is also possible to replace it with a device.
  • the integrated flow path switching device includes, for example, the functions of the first heat medium flow path switching devices 32a to 32d, the second heat medium flow path switching devices 33a to 33d, and the heat medium flow rate adjustment devices 34a to 34d. It is good also as a structure which has a block (integrated) structure like patent document 2 or patent document 3 provided with these.
  • the heat exchanger related to heat medium 25 functions as a condenser (heat radiator) or an evaporator, performs heat exchange between the heat source side refrigerant and the heat medium, and generates heat generated by the outdoor unit 1 or stored in the heat source side refrigerant. It transfers heat to the heat medium. That is, during the heating operation, the heat exchanger related to heat medium 25 functions as a condenser (heat radiator) and transmits the heat of the heat source side refrigerant to the heat medium. Further, during the cooling operation, the heat exchanger related to heat medium 25 functions as an evaporator and transmits the cold heat of the heat source side refrigerant to the heat medium.
  • the heat exchanger related to heat medium 25a is provided between the first expansion device 26a and the second refrigerant flow switching device 28a in the refrigerant circuit A, and serves to cool the heat medium in the air-conditioning mixed operation mode. It is.
  • the heat exchanger related to heat medium 25b is provided between the first expansion device 26b and the second refrigerant flow switching device 28b in the refrigerant circulation circuit A, and heats the heat medium in the air-conditioning mixed operation mode. It is something to offer.
  • the first expansion device 26 functions as a pressure reducing valve or an expansion valve, and expands the heat source side refrigerant by reducing the pressure.
  • the first expansion device 26a is provided on the upstream side of the heat exchanger related to heat medium 25a in the flow of the heat source side refrigerant during the cooling operation (see FIG. 8 described later).
  • the first expansion device 26b is provided on the upstream side of the heat exchanger related to heat medium 25b in the flow of the heat source side refrigerant during the cooling operation (see FIG. 8 described later).
  • the first throttling device 26 may be constituted by a device whose opening degree can be variably controlled, for example, an electronic expansion valve.
  • the opening / closing device 27 and the opening / closing device 29 are constituted by, for example, electromagnetic valves that can be opened and closed by energization, and open and close the flow path in which they are provided. That is, the opening / closing device 27 and the opening / closing device 29 are controlled to open / close according to the operation mode, and switch the flow path of the heat source side refrigerant.
  • the opening / closing device 27 is provided in the refrigerant pipe 4 on the inlet side of the heat source side refrigerant (the refrigerant pipe 4 positioned at the lowest level in the drawing among the refrigerant pipes 4 connecting the outdoor unit 1 and the relay unit 2).
  • the opening / closing device 29 is provided in a pipe (bypass pipe 20) connecting the refrigerant pipe 4 on the inlet side of the heat source side refrigerant and the refrigerant pipe 4 on the outlet side.
  • the opening / closing device 27 and the opening / closing device 29 may be any devices that can open and close the flow path in which they are provided, and may be devices that control the opening of an electronic expansion valve, for example.
  • the second refrigerant flow switching device 28 is constituted by a four-way valve, for example, and switches the flow of the heat source side refrigerant so that the heat exchanger related to heat medium 25 functions as a condenser or an evaporator according to the operation mode. is there.
  • the second refrigerant flow switching device 28a is provided on the downstream side of the heat exchanger related to heat medium 25a in the flow of the heat source side refrigerant during the cooling operation (see FIG. 8 described later).
  • the second refrigerant flow switching device 28b is provided on the downstream side of the heat exchanger related to heat medium 25b in the flow of the heat source side refrigerant in the cooling operation mode (see FIG. 8 described later).
  • the pump 31 circulates the heat medium flowing through the heat medium pipe 5 to the heat medium circuit B.
  • the pump 31 a is provided in the heat medium pipe 5 between the heat exchanger related to heat medium 25 a and the second heat medium flow switching device 33.
  • the pump 31 b is provided in the heat medium pipe 5 between the heat exchanger related to heat medium 25 b and the second heat medium flow switching device 33.
  • the pump 31 may be constituted by a capacity-controllable pump, for example, and the flow rate thereof may be adjusted according to the load in the indoor unit 3.
  • the first heat medium flow switching device 32 switches the connection between the outlet side of the heat medium flow path of the use side heat exchanger 35 and the inlet side of the heat medium flow path of the heat exchanger related to heat medium 25. .
  • the number of first heat medium flow switching devices 32 is set according to the number of indoor units 3 installed (here, four).
  • the first heat medium flow switching device 32 connects the outlet side of the heat medium flow path of the use side heat exchanger 35 to the inlet side of the heat medium flow path of the heat medium heat exchanger 25a or the heat between heat medium. It switches to the inlet side of the heat medium flow path of the exchanger 25b.
  • one of the three sides is in the heat exchanger 25a, one of the three is in the heat exchanger 25b, and one of the three is in the heat medium flow rate.
  • Each is connected to the adjustment device 34 and provided on the outlet side of the heat medium flow path of the use side heat exchanger 35.
  • the switching of the heat medium flow path includes not only complete switching from one to the other but also partial switching from one to the other.
  • the first heat medium flow switching device 32 may be constituted by a three-way valve, for example.
  • the second heat medium flow switching device 33 connects the connection side on the inlet side of the heat medium flow path of the use side heat exchanger 35 to the outlet side of the heat medium flow path of the heat medium heat exchanger 25a or the heat between heat medium. It switches to the exit side of the heat medium flow path of the exchanger 25b.
  • the second heat medium flow switching device 33 is provided in a number (four in this case) corresponding to the number of indoor units 3 installed.
  • one of the three heat transfer medium heat exchangers 25a, one of the three heat transfer medium heat exchangers 25b, and one of the three heat transfer side heats. Each is connected to the exchanger 35 and provided on the inlet side of the heat medium flow path of the use side heat exchanger 35.
  • the second heat medium flow switching device 33a, the second heat medium flow switching device 33b, the second heat medium flow switching device 33c, and the second heat medium flow switching are performed from the upper side of the drawing. Illustrated as device 33d.
  • the switching of the heat medium flow path includes not only complete switching from one to the other but also partial switching from one to the other.
  • the second heat medium flow switching device 33 may be constituted by a three-way valve, for example.
  • the heat medium flow control device 34 is configured by a two-way valve or the like that can control the opening area, and controls the flow rate of the heat medium flowing through the heat medium pipe 5.
  • the number of the heat medium flow control devices 34 is set according to the number of indoor units 3 installed (four in this case).
  • One of the heat medium flow control devices 34 is connected to the use side heat exchanger 35 and the other is connected to the first heat medium flow switching device 32, and is connected to the outlet side of the heat medium flow channel of the use side heat exchanger 35. Is provided.
  • the heat medium flow control device 34 adjusts the amount of the heat medium flowing into the indoor unit 3 according to the temperature of the heat medium flowing into the indoor unit 3 and the temperature of the heat medium flowing out, so that the optimum heat according to the indoor load is adjusted.
  • the medium amount can be provided to the indoor unit 3.
  • the heat medium flow rate adjustment device 34a, the heat medium flow rate adjustment device 34b, the heat medium flow rate adjustment device 34c, and the heat medium flow rate adjustment device 34d are illustrated from the upper side of the drawing.
  • the heat medium flow control device 34 may be provided on the inlet side of the heat medium flow path of the use side heat exchanger 35.
  • the heat medium flow control device 34 may be provided on the inlet side of the heat medium flow path of the use side heat exchanger 35 and between the second heat medium flow switching device 33 and the use side heat exchanger 35. Good.
  • the indoor unit 3 does not require a load such as the stop mode and the thermo OFF, the heat medium supply to the indoor unit 3 can be stopped by fully closing the heat medium flow control device 34.
  • the heat medium flow control device 34 may be omitted. Is possible.
  • the first heat medium flow switching device 32, the second heat medium flow switching device 33, and the heat medium flow control device 34 are integrated (blocked), and the flow switch function, the flow control function, An integrated flow path switching device to which a flow path closing function is added can be substituted for the first heat medium flow path switching device 32, the second heat medium flow path switching device 33, and the heat medium flow rate adjustment device.
  • the relay unit 2 is provided with two temperature sensors 40a and 40b (sometimes simply referred to as the temperature sensor 40).
  • the temperature sensor 40 detects the temperature of the heat medium flowing out from the intermediate heat exchanger 25, that is, the temperature of the heat medium at the outlet of the intermediate heat exchanger 25.
  • the temperature sensor 40a is provided in the heat medium pipe 5 on the heat medium suction side of the pump 31a.
  • the temperature sensor 40b is provided in the heat medium pipe 5 on the heat medium suction side of the pump 31b.
  • the temperature sensor 40 may be composed of, for example, a thermistor.
  • the information (temperature information) detected by the temperature sensor 40 is sent to the control device 50 that performs overall control of the operation of the air conditioner 100.
  • the information (temperature information) detected by the temperature sensor 40 includes the driving frequency of the compressor 10, the rotational speed of the blower (not shown), the switching of the first refrigerant flow switching device 11, the driving frequency of the pump 31, and the second This is used for control such as switching of the refrigerant flow switching device 28, switching of the flow path of the heat medium, and adjustment of the heat medium flow rate of the indoor unit 3.
  • the state in which the control apparatus 50 is mounted in the relay unit 2 is shown as an example, the present invention is not limited to this, and the outdoor unit 1 or the indoor unit 3 or each unit is communicatably mounted. You may do it.
  • control device 50 is constituted by a microcomputer or the like, and based on detection results from various detection means and instructions from the remote controller, the driving frequency of the compressor 10, the rotational speed of the blower (including ON / OFF), the first The switching of the one refrigerant flow switching device 11, the driving of the pump 31, the opening of the first expansion device 26, and the opening of the second expansion device 26c are controlled.
  • the control device 50 switches the second refrigerant flow switching device 28, the first heat medium flow switching device 32, the second heat medium flow switching device 33, and the heat medium flow control device. 34, the drive of the heat medium passage opening and closing device 37, the opening and closing of the opening and closing devices 27 and 29, and the opening and closing of the heat medium passage opening and closing device 36 are controlled.
  • the control device 50 performs control so that the indoor space maintains the set temperature.
  • heat to the use side heat exchanger 35 provided in the indoor unit 3 is controlled.
  • the medium supply is stopped (Thermo OFF).
  • the control device 50 only stops the supply of the heat medium to the use side heat exchanger 35 provided in the indoor unit 3 if there is an instruction from the user.
  • the operation of the fan attached to the use side heat exchanger 35 is also stopped (stop mode).
  • the control device 50 executes the thermo-OFF to adjust the temperature of the indoor space when the indoor space reaches the set temperature, and executes the stop mode when receiving an operation stop instruction from the user.
  • the heat medium pipe 5 through which the heat medium flows has one connected to the heat exchanger related to heat medium 25a and one connected to the heat exchanger related to heat medium 25b.
  • the heat medium pipe 5 is branched (here, four branches each) according to the number of indoor units 3 connected to the relay unit 2.
  • the one connected to the heat exchanger related to heat medium 25 a and the one connected to the heat exchanger related to heat medium 25 b include the first heat medium flow switching device 32, Two heat medium flow switching devices 33 are connected.
  • the heat medium from the heat exchanger related to heat medium 25a flows into the use-side heat exchanger 35, or the heat medium Whether the heat medium from the intermediate heat exchanger 25b flows into the use side heat exchanger 35 is determined.
  • the number of connected indoor units 3 can be increased by connecting to the relay unit 2.
  • the branch unit 60 will be described.
  • FIG. 3 is a diagram illustrating an example of a heat medium circuit configuration of the branch unit 60 of FIG.
  • the branch unit 60 includes a connection portion 61 for connection to the relay unit 2, and the branch unit 60 and the relay unit 2 are connected to each other by a connection pipe 70 through the connection portion 61.
  • the branch unit 60 includes a branch unit 62 that branches the heat medium of the heat medium circuit B that has flowed in from the relay unit 2 via the connection unit 61.
  • the branch part 62 has a plurality of branch ports. Since the number of branches is four here, the branch unit 62 includes four branch ports.
  • the use side heat exchangers (additional use side heat exchangers) 35a to 35d of the indoor unit 3 to be added are connected to the respective branch ports, and the heat exchangers 25a and 25b between the heat mediums of the relay unit 2 are connected to the branch ports.
  • a heat medium circulates between the use side heat exchangers 35a to 35d.
  • the branch unit 60 includes a connection pipe 70 and four first heat medium flow switching devices 32e to 32h (similarly to the first heat medium flow switching device 32 in the relay unit 2). 32) and four second heat medium flow switching devices 33e to 33h (similarly to the second heat medium flow switching device 33 in the relay unit 2), And four heat medium flow control devices 34e to 34h (simply referred to as the heat medium flow control device 34 as well as the heat medium flow control device 34 in the relay unit 2). ing.
  • the first heat medium flow switching devices 32e to 32h, the second heat medium flow switching devices 33e to 33h, and the heat medium flow control devices 34e to 34h are integrated flow channel switching that unifies the functions of these switching devices. It is also possible to replace it with a device.
  • the integrated flow path switching device includes, for example, the functions of the first heat medium flow path switching devices 32a to 32d, the second heat medium flow path switching devices 33a to 33d, and the heat medium flow rate adjustment devices 34a to 34d. It is good also as a structure which has a block structure like patent document 2 provided with.
  • the first heat medium flow switching devices 32e to 32h, the second heat medium flow switching devices 33e to 33h, and the heat medium flow control devices 34e to 34h constitute the second heat medium flow switching means of the present invention.
  • the first heat medium flow switching device 32 of the branch unit 60 is connected to the relay unit 2 by two pipes by a connection pipe 70, and the outlet of the heat medium flow path of the use side heat exchanger 35 in the relay unit 2. The connection between the side and the inlet side of the heat medium flow path of the heat exchanger related to heat medium 25 is switched.
  • the first heat medium flow switching device 32 is provided with a number (four in this case) corresponding to the number of indoor units 3 connected to the branch unit.
  • the first heat medium flow switching device 32 In the first heat medium flow switching device 32, one of the three sides is connected to the heat exchanger 25a in the relay unit 2 through the connection pipe 70, and one of the three directions is a heat medium in the relay unit 2 through the connection pipe 70. One of the three sides is connected to the intermediate heat exchanger 25b to the heat medium flow control device 34 in the branch unit 60, respectively.
  • the first heat medium flow switching device 32 is provided on the outlet side of the heat medium flow path of the use side heat exchanger 35 connected to the branch unit 60.
  • the first heat medium flow switching device 32e, the first heat medium flow switching device 32f, and the first heat medium flow switching device 32g are arranged from the upper side of the drawing.
  • the first heat medium flow switching device 32h is illustrated.
  • the switching of the heat medium flow path includes not only complete switching from one to the other but also partial switching from one to the other.
  • the first heat medium flow switching device 32 may be constituted by a three-way valve, for example.
  • the second heat medium flow switching device 33 in the branch unit 60 is connected to the relay unit 2 by two pipes by the connection pipe 70, and the heat medium flow path of the heat exchanger 25 between the heat medium in the relay unit 2 is connected.
  • the connection between the outlet side and the inlet side of the heat medium flow path of the use side heat exchanger 35 is switched.
  • the number of second heat medium flow switching devices 33 in the branch unit 60 is set according to the number of indoor units 3 connected to the branch unit 60 (four in this case).
  • one of the three sides is connected to the heat exchanger 25a in the relay unit 2 through the connection pipe 70, and one of the three sides is connected to the heat medium in the relay unit 2 through the connection pipe 70.
  • One of the three sides is connected to the intermediate heat exchanger 25 b and to the use side heat exchanger 35 connected to the branch unit 60.
  • the second heat medium flow switching device 33 is provided on the inlet side of the heat medium flow path of the use side heat exchanger 35 connected to the branch unit 60.
  • the second heat medium flow switching device 33e, the second heat medium flow switching device 33f, and the second heat medium flow switching device 33g are arranged from the upper side of the drawing.
  • the second heat medium flow switching device 33h is illustrated.
  • the switching of the heat medium flow path includes not only complete switching from one to the other but also partial switching from one to the other.
  • the second heat medium flow switching device 33 may be constituted by a three-way valve, for example.
  • the heat medium flow control device 34 in the branch unit 60 is configured by a two-way valve or the like that can control the opening area, and controls the flow rate when the heat medium conveyed from the relay unit 2 flows through the connection pipe 70. is there.
  • the number of heat medium flow control devices 34 in the branch unit 60 is set according to the number of indoor units 3 connected to the branch unit (four in this case).
  • One of the heat medium flow control devices 34 in the branch unit 60 is connected to the use side heat exchanger 35 connected to the branch unit 60, and the other is connected to the first heat medium flow switching device 32 connected to the branch unit 60. It is connected.
  • the heat medium flow control device 34 is provided on the outlet side of the heat medium flow path of the use side heat exchanger 35 connected to the branch unit 60.
  • the heat medium flow control device 34 adjusts the amount of the heat medium flowing into the indoor unit 3 based on the temperature of the heat medium flowing into the indoor unit 3 connected to the branch unit 60 and the temperature of the heat medium flowing out. Thus, it is possible to provide the indoor unit 3 with the optimum amount of heat medium according to the indoor load.
  • the heat medium flow rate adjustment device 34e In correspondence with the indoor unit 3 connected to the branch unit 60, the heat medium flow rate adjustment device 34e, the heat medium flow rate adjustment device 34f, the heat medium flow rate adjustment device 34g, and the heat medium flow rate adjustment device 34h are illustrated from the upper side of the drawing. ing. Further, the heat medium flow control device 34 may be provided on the inlet side of the heat medium flow path of the use side heat exchanger 35. Further, the heat medium flow control device 34 may be provided on the inlet side of the heat medium flow path of the use side heat exchanger 35 and between the second heat medium flow switching device 33 and the use side heat exchanger 35. Good. Furthermore, when the indoor unit 3 does not require a load such as the stop mode and the thermo OFF, the heat medium supply to the indoor unit 3 can be stopped by fully closing the heat medium flow control device 34.
  • the heat medium flow control device 34 may be omitted. Is possible.
  • the first heat medium flow switching device 32, the second heat medium flow switching device 33, and the heat medium flow control device 34 are integrated (blocked), and the flow switch function, the flow control function, An integrated flow path switching device to which a flow path closing function is added can be substituted for the first heat medium flow path switching device 32, the second heat medium flow path switching device 33, and the heat medium flow rate adjustment device.
  • FIG. 4 is a diagram illustrating a circuit configuration of the air-conditioning apparatus 100 of FIG.
  • the connection pipe 70 through which the heat medium flows is connected to the relay unit 2 and connected to the heat exchanger related to heat medium 25a in the relay unit 2 and to the heat exchanger related to heat medium 25b. It has what is done.
  • the connection pipe 70 is branched (here, four branches each) according to the number of indoor units 3 connected to the branch unit 60. Of the connection pipes 70, the one connected to the heat exchanger related to heat medium 25 a in the relay unit 2 and the one connected to the heat exchanger related to heat medium 25 b are connected to the first heat medium flow path in the branch unit 60.
  • the switching device 32 and the second heat medium flow switching device 33 in the branch unit 60 are connected.
  • the heat medium from the intermediate heat exchanger 25a in the relay unit 2 is used. Whether to flow into the side heat exchanger 35 or to flow the heat medium from the heat exchanger related to heat medium 25b in the relay unit 2 into the use side heat exchanger 35 is determined.
  • FIG. 5 is a diagram illustrating another example of the refrigerant circuit in the air-conditioning apparatus 100 according to the embodiment of the present invention.
  • FIG. 5 shows a configuration in which the connection pipe 70 is connected across the two relay units 2.
  • the branch unit 60 in FIG. 5 further includes another connection portion 63 in addition to the connection portion 61 of the branch unit 60 in FIG. 4, and the two relay units 2 and connection pipes are connected via the connection portions 61 and 63. 70 is connected.
  • the connection pipe 70 can be connected to each of the two relay units 2 to the heat exchanger related to heat medium 25a in the relay unit 2 or to the heat exchanger related to heat medium 25b. Yes.
  • the compressor 10 the first refrigerant flow switching device 11, the heat source side heat exchanger 12, the switching device 27, the switching device 29, and the second refrigerant flow switching device 28.
  • the refrigerant flow path, the first expansion device 26, and the accumulator 19 of the heat exchanger related to heat medium 25 are connected by the refrigerant pipe 4 to constitute the refrigerant circuit A.
  • the switching device 33 is connected by the heat medium pipe 5 to constitute the heat medium circuit B. That is, a plurality of use side heat exchangers 35 are connected in parallel to each of the heat exchangers 25 between heat media, and the heat medium circulation circuit B is made into a plurality of systems.
  • the outdoor unit 1 and the relay unit 2 are connected via the heat exchanger related to heat medium 25a and the heat exchanger related to heat medium 25b provided in the relay unit 2.
  • the relay unit 2 and the indoor unit 3 are connected to each other via the heat exchanger related to heat medium 25a and the heat exchanger related to heat medium 25b. That is, in the air conditioner 100, the heat source side refrigerant that circulates through the refrigerant circulation circuit A and the heat medium that circulates through the heat medium circulation circuit B in the heat exchanger related to heat medium 25a and the heat exchanger related to heat medium 25b generate heat. It is supposed to be replaced. By using such a configuration, the air conditioner 100 can realize an optimal cooling operation or heating operation according to the indoor load.
  • the operation modes executed by the air conditioner 100 include a heating only operation mode, a cooling only operation mode, a cooling main operation mode, and a heating main operation mode as described above.
  • Each of these operation modes includes switching of the first refrigerant flow switching device 11, the second refrigerant flow switching device 28, the first heat medium flow switching device 32, and the second heat medium flow switching device 33, and an opening / closing device. 27 and opening / closing of the opening / closing device 29 can be executed in combination.
  • FIG. 6 is a diagram showing the flow of the heat source side refrigerant and the flow of the heat medium during the heating only operation in the air conditioning apparatus 100 shown in FIG.
  • the piping represented by the thick line has shown the piping through which the heat source side refrigerant
  • the flow direction of the heat source side refrigerant is indicated by a solid line arrow
  • the flow direction of the heat medium is indicated by a dotted line arrow.
  • four indoor units 3a to 3d connected to the relay unit 2 are connected to the heat exchanger related to heat medium 25b to constitute a heat medium circulation circuit B, and are connected to the branch unit 60.
  • An example in which the four indoor units 3e to 3h are connected to the heat exchanger related to heat medium 25b to form another heat medium circuit B will be described.
  • the first refrigerant flow switching device 11 relays the heat source side refrigerant discharged from the compressor 10 without passing through the heat source side heat exchanger 12. Switching to unit 2 is made.
  • the four first heat medium flow switching devices 32a to 32d and the four second heat medium flow switching are performed so that the four indoor units 3a to 3d are connected to the heat exchanger related to heat medium 25b.
  • Each of the devices 33a to 33d is switched.
  • the four heat medium flow control devices 34a to 34d are controlled so as to have a heat medium flow rate necessary to cover the air conditioning load required in the room where the indoor units 3a to 3d are installed.
  • the opening / closing device 27 is closed and the opening / closing device 29 is open.
  • the second refrigerant flow switching device 28 is switched to the heating operation side.
  • the pump 31 sets the flow rate instruction value according to the air conditioning load of the indoor units 3 a to 3 d connected to the relay unit 2 and the air conditioning load of the indoor units 3 e to 3 h connected to the branch unit 60. Based on the action.
  • the four first heat medium flow switching devices 32e to 32h and the four second heat medium flow paths are connected so that the four indoor units 3e to 3h are connected to the heat exchanger related to heat medium 25a.
  • Each of the switching devices 33e to 33h is switched.
  • the four heat medium flow control devices 34e to 34h are controlled so as to have a flow rate necessary to cover the air conditioning load required in the room in which the indoor units 3e to 3h are installed.
  • the low-temperature and low-pressure refrigerant is compressed by the compressor 10 and discharged as a high-temperature and high-pressure gas refrigerant.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 10 flows out of the outdoor unit 1 through the first refrigerant flow switching device 11 and the first connection pipe 4a.
  • the high-temperature and high-pressure gas refrigerant flowing out of the outdoor unit 1 flows into the relay unit 2 through the refrigerant pipe 4.
  • the high-temperature and high-pressure gas refrigerant flowing into the relay unit 2 passes through the second refrigerant flow switching devices 28a and 28b, then passes through the heat exchangers 25a and 25b, and passes through the first expansion devices 26a and 26b.
  • the refrigerant that has passed through the opening / closing device 29 is conveyed to the outdoor unit 1 and exchanges heat with the outside air in the heat source side heat exchanger 12 to become a low-temperature and low-pressure gas refrigerant.
  • the low-temperature and low-pressure gas refrigerant is again sucked into the compressor 10 via the first refrigerant flow switching device 11 and the accumulator 19.
  • the opening degree of the first expansion devices 26a and 26b is controlled so that the subcooling (supercooling degree) of the outlet refrigerant of the heat exchangers 25a and 25b is constant.
  • This subcool (degree of supercooling) is a value obtained by converting the pressure of the heat source side refrigerant flowing between the heat exchangers 25a, 25b and the first expansion devices 26a, 26b into a saturation temperature, and heat exchange between heat media. This is obtained as a difference from the temperature on the outlet side of the containers 25a and 25b.
  • the heat medium pressurized by the driving of the pump 31a and the pump 31b is sent to the use side heat exchangers 35a to 35h, exchanges heat with room air, and then flows out from the use side heat exchangers 35a to 35h. It flows into the flow rate adjusting devices 34a to 34h. At this time, the heat medium is controlled to a flow rate necessary to cover the air conditioning load required indoors by the action of the heat medium flow control devices 34a to 34h, and the use side heat exchangers 35a to 35h and the heat medium flow rate are controlled. It passes through the adjusting devices 34a to 34h.
  • the heat medium flowing out from the heat medium flow control devices 34a to 34h flows through the first heat medium flow switching devices 32a to 32d.
  • the path is switched, passes through the heat medium pipe 5, and flows into and passes through the heat exchanger related to heat medium 25b.
  • the heat medium that has passed through the intermediate heat exchanger 25b is sucked into the pump 31b again, and then passes through the second heat medium flow switching devices 33a to 33d and is sent to the use side heat exchangers 35a to 35d. It is.
  • the heat medium flowing out from the heat medium flow control devices 34a to 34h the heat medium flowing out from the heat medium flow control devices 34e to 34h in the branch unit 60 is flown by the first heat medium flow switching devices 32e to 32h.
  • the path is switched, passes through the connecting pipe 70, and flows into and passes through the heat exchanger related to heat medium 25a.
  • the heat medium that has passed through the heat exchanger related to heat medium 25a is sucked into the pump 31a again, and then passes through the second heat medium flow switching devices 33e to 33h and is sent to the use side heat exchangers 35e to 35h. It is.
  • the heat medium circulates between each of the heat exchanger related to heat medium 25a and the heat exchanger related to heat medium 25b and the use side heat exchangers 35a to 35h.
  • the heat medium exchanges heat with room air in the use side heat exchangers 35e to 35h functioning as condensers, so that the room where the indoor units 3e to 3h are installed is heated.
  • the total heating capacity required for the indoor unit 3 connected to the heat exchanger related to heat medium 25a and the total heating capacity required for the indoor unit 3 connected to the heat exchanger related to heat medium 25b are all indoor units. 3 is determined so as to be divided into approximately half of the total heating capacity required.
  • the heating capacity of each indoor unit 3 can be determined by the control device 50, and if the first heat medium flow switching devices 32a to 32h and the second heat medium flow switching devices 33a to 33h are switched according to the heating capacity. Good.
  • FIG. 7 is a diagram showing the flow of the heat source side refrigerant and the flow of the heat medium during the heating only operation in the air conditioning apparatus 100 shown in FIG.
  • the flow of the heat source side refrigerant in the refrigerant circuit A is as described with reference to FIG.
  • the upper relay unit 2 in FIG. 7 is referred to as a relay unit 2A
  • the lower relay unit 2 is referred to as a relay unit 2B.
  • connection mode of the indoor units 3e to 3h connected to the branch unit 60 to the relay unit 2 is conceivable as the connection mode of the indoor units 3e to 3h connected to the branch unit 60 to the relay unit 2.
  • the flow of the heat medium will be described with reference to FIG. It is the same as the flow.
  • the heat medium is controlled to a flow rate required to cover the air conditioning load required indoors by the action of the heat medium flow rate adjusting devices 34e to 34h, and the use side heat exchangers 35e to 35h and the heat medium flow rate adjustment are controlled. Passes through devices 34e-34h.
  • connection destination of the branch unit 60 can be switched to the relay unit 2A or the relay unit 2B. Therefore, for example, when the relay unit 2A cannot be used during maintenance, the operation can be continued by setting the connection destination of the branch unit 60 to the relay unit 2B.
  • the indoor units 3e to 3g connected to the branch unit 60 are connected to the intermediate heat exchanger 25a of the relay unit 2A, and the indoor unit 3h connected to the branch unit 60 is connected to the relay unit 2B.
  • a case where the heat exchanger is connected to the intermediate heat exchanger 25b will be described as an example.
  • the indoor units 3a to 3d connected to the relay unit 2A are connected to the heat exchanger related to heat medium 25b of the relay unit 2A, and the indoor units 3a to 3d connected to the relay unit 2B are connected to the heat of the relay unit 2B. It is assumed that the medium-to-medium heat exchanger 25b is connected.
  • the first heat medium flow switching devices 32e to 32g and the second heat medium flow switching devices 33e to 33g are switched to the heat exchanger related to heat medium 25a.
  • on-off valves 71a to 71d are provided between the relay unit 2A and the branch unit 60, and the relay unit 2B and the branch unit 60 are connected to each other.
  • the on / off valves 72a to 72d are provided between them. Then, among the on-off valves 71a to 71d provided on the relay unit 2A side, the on-off valve 71b and the on-off valve 71d provided in the pipe directly communicating with the heat exchanger related to heat medium 25a are set to “open”. .
  • a heat medium circulation circuit B is configured in which the heat medium circulates between the heat exchangers between heat medium 25a of the relay unit 2A and the use side heat exchangers 35e to 35g.
  • the heat medium having a flow rate necessary to cover the air conditioning load required in the room is circulated by the action of the heat medium flow control devices 34e to 34g to heat the room.
  • the first heat medium flow switching device 32h and the second heat medium flow switching device 33h are switched to the heat exchanger related to heat medium 25b. Further, among the on-off valves 72a to 72d provided on the relay unit 2B side, the on-off valve 72a and the on-off valve 72c provided in the pipe directly communicating with the heat exchanger related to heat medium 25b are set to “open”. On the other hand, among the on-off valves 72a to 72d, the on-off valve 72b and the on-off valve 72d provided in the pipe directly communicating with the heat exchanger related to heat medium 25a are closed.
  • the heat medium circulation circuit B in which the heat medium circulates between the heat exchanger 25b between the heat medium of the relay unit 2B and the use side heat exchanger 35h is configured.
  • the heat medium circulation circuit B the heat medium having a flow rate necessary to cover the air conditioning load required in the room is circulated by the action of the heat medium flow control device 34h to heat the room.
  • the open / close valves 71a to 71d and the open / close valves 72a to 72d may be electromagnetic open / close valves or manually open / close valves that can be manually opened / closed.
  • the indoor units 3e to 3h in the branch unit 60 are connected across the two relay units 2A and 2B and the heat medium is divided into the relay units 2A and 2B, the following is performed.
  • the effect is obtained. That is, in the case of a configuration that is not connected across the two, the conveyance power source in the branch unit is limited to the pump 31 of one relay unit 2, but by connecting across the two relay units 2, Both of the pumps 31 provided in the two relay units 2 can be used as the conveyance power source.
  • the pump 31 on the relay unit 2B side can also be used to The shortage can be compensated and efficient air conditioning can be realized.
  • the indoor unit 3 connected to the intermediate heat exchanger 25b of the relay unit 2A and the indoor unit 3 connected to the intermediate heat exchanger 25b of the relay unit 2B coexist.
  • a valve is provided so that the refrigerant from the relay unit 2A to the branch unit 60 and the refrigerant from the relay unit 2B to the branch unit 60 do not collide in one connection pipe 70. .
  • FIG. 8 is a diagram showing the flow of the heat source side refrigerant and the flow of the heat medium during the cooling only operation of the air-conditioning apparatus 100 shown in FIG. Moreover, in FIG. 8, the flow direction of the heat source side refrigerant is indicated by a solid line arrow, and the flow direction of the heat medium is indicated by a dotted line arrow.
  • the four indoor units 3a to 3d connected to the relay unit 2 are connected to the heat exchanger related to heat medium 25b to form the heat medium circuit B, and are connected to the branch unit 60.
  • An example in which the four indoor units 3e to 3h are connected to the heat exchanger related to heat medium 25b to form the heat medium circuit B will be described.
  • the first refrigerant flow switching device 11 switches the heat source side refrigerant discharged from the compressor 10 to flow into the heat source side heat exchanger 12. It is done.
  • the first heat medium flow switching devices 32a to 32d and the four second heat medium flow switching devices 33a are connected so that the four indoor units 3a to 3d are connected to the heat exchanger related to heat medium 25b.
  • Each of .about.33d is switched.
  • the four heat medium flow control devices 34a to 34d are controlled so as to have a heat medium flow rate necessary to cover the air conditioning load required in the room where the indoor units 3a to 3d are installed.
  • the opening / closing device 27 is closed and the opening / closing device 29 is open.
  • the second refrigerant flow switching device 28 is switched to the cooling operation side.
  • the first heat medium flow switching devices 32e to 32h and the four second heat medium flow switching devices are connected so that the four indoor units 3e to 3h are connected to the heat exchanger related to heat medium 25a.
  • Each of 33e to 33h is switched.
  • the four heat medium flow control devices 34e to 34h are controlled so as to have a flow rate necessary to cover the air conditioning load required in the room in which the indoor units 3e to 3h are installed.
  • the pump 31 sets the flow rate instruction value according to the air conditioning load of the indoor units 3 a to 3 d connected to the relay unit 2 and the air conditioning load of the indoor units 3 e to 3 h connected to the branch unit 60. Based on the action.
  • the low-temperature and low-pressure refrigerant is compressed by the compressor 10 and discharged as a high-temperature and high-pressure gas refrigerant.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 10 flows into the heat source side heat exchanger 12 via the first refrigerant flow switching device 11, performs heat exchange with the outside air, and performs high-temperature and high-pressure liquid or two-phase. Becomes a refrigerant.
  • the high-temperature and high-pressure liquid or two-phase refrigerant that has flowed out of the heat source side heat exchanger 12 flows out of the outdoor unit 1 through the check valve 13a.
  • the high-temperature and high-pressure liquid or two-phase refrigerant that has flowed out of the outdoor unit 1 flows into the relay unit 2 through the refrigerant pipe 4.
  • the high-temperature and high-pressure liquid or two-phase refrigerant that has flowed into the relay unit 2 passes through the opening / closing device 27 and then passes through the first expansion devices 26a and 26b, and then becomes a low-temperature and low-pressure two-phase refrigerant.
  • the low-temperature and low-pressure two-phase refrigerant exchanges heat with the heat medium in the heat exchangers 25a and 25b, then becomes a low-temperature and low-pressure gas refrigerant, and then flows out from the relay unit 2 and into the outdoor unit 1. .
  • the refrigerant flowing into the outdoor unit 1 is again sucked into the compressor 10 via the first refrigerant flow switching device 11 and the accumulator 19.
  • the opening degree of the first expansion devices 26a and 26b is controlled so that the superheat (superheat degree) of the outlet refrigerant of the heat exchangers 25a and 25b becomes constant.
  • the superheat (degree of superheat) includes a value obtained by converting the pressure of the heat-source-side refrigerant flowing between the heat exchangers 25a and 25b and the first expansion devices 26a and 26b into a saturation temperature, and a heat exchanger between the heat exchangers.
  • the outlets 25a and 25b are obtained as a difference from the sum temperature.
  • the flow of the heat medium in the heat medium circuit B is the same as the flow of the heat medium described in FIG. That is, the air conditioning load required indoors between the heat exchangers between heat exchangers (here, evaporators) 25b and the use side heat exchangers 35a to 35d by the action of the heat medium flow control devices 34a to 34d. A heat medium with a flow rate necessary to cover the heat is circulated. Then, the heat medium exchanges heat with room air in the use side heat exchangers 35a to 35d, thereby cooling the room in which the indoor units 3a to 3d are respectively installed.
  • a heat medium with a flow rate necessary to cover the heat is circulated.
  • the heat medium exchanges heat with indoor air in the use side heat exchangers 35e to 35h, whereby the room in which the indoor units 3e to 3h are respectively installed is cooled.
  • FIG. 9 is a diagram showing the flow of the heat source side refrigerant and the flow of the heat medium during the cooling only operation in the air conditioning apparatus 110 shown in FIG.
  • the flow of the heat source side refrigerant in the refrigerant circuit A in this configuration is as described in FIG.
  • the flow of the heat medium in the heat medium circuit B is as described in FIG. That is, there is a flow of the above (1) and (2).
  • the heat medium circulation circuit B the heat medium having a flow rate necessary to cover the air conditioning load required indoors is circulated by the action of the heat medium flow control devices 34a to 34h. Then, the heat medium exchanges heat with room air in the use side heat exchangers 35a to 35h, thereby cooling the room in which the indoor units 3a to 3h are respectively installed.
  • FIG. 10 is a diagram showing the flow of the heat source side refrigerant and the flow of the heat medium during the heating main operation in the mixed operation in the air conditioning apparatus shown in FIG.
  • the piping represented with the thick line has shown the piping through which a heat source side refrigerant
  • the flow direction of the heat source side refrigerant is indicated by solid arrows
  • the flow direction of the heat medium is indicated by dotted arrows.
  • the heating main operation mode will be described by taking as an example a case where the indoor unit 3a is in the heating operation mode and the indoor unit 3e is in the cooling operation mode.
  • the other indoor units 3b to 3d and 3f to 3h are not subjected to a load due to the operation stop (there is no need to cool and heat the room, including a state where the thermo is off), and the use side heat exchanger 35b to It is assumed that the heat medium does not flow through 35d and 35f to 35h.
  • the first refrigerant is such that the heat source side refrigerant discharged from the compressor 10 flows into the relay unit 2 without passing through the heat source side heat exchanger 12.
  • the flow path switching device 11 is switched.
  • the opening / closing device 27 is closed and the opening / closing device 29 is closed.
  • the heat medium flow control device 34a is an opening that can flow a flow rate necessary to cover an air conditioning load (here, a heating load) required in the room where the indoor unit 3a is installed.
  • the heating medium flow control devices 34b to 34d are closed each time.
  • the heat medium flow control device 34e is an opening that can flow a flow rate necessary to cover an air conditioning load (here, a cooling load) required in the room in which the indoor unit 3a is installed.
  • the heating medium flow rate adjusting devices 34f to 34h are closed each time.
  • the low-temperature and low-pressure refrigerant is compressed by the compressor 10 and discharged as a high-temperature and high-pressure gas refrigerant.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 10 flows out of the outdoor unit 1 through the first refrigerant flow switching device 11 and the first connection pipe 4a.
  • the high-temperature and high-pressure gas refrigerant flowing out of the outdoor unit 1 flows into the relay unit 2 through the refrigerant pipe 4.
  • the high-temperature and high-pressure gas refrigerant flowing into the relay unit 2 passes through the second refrigerant flow switching device 28b and then passes through the heat exchanger related to heat medium 25b that functions as a condenser.
  • the refrigerant after passing through the heat exchanger related to heat medium 25b passes through the first expansion device 26b, then passes through the first expansion device 26a, and passes through the heat exchanger related to heat medium 25a functioning as an evaporator.
  • the refrigerant that has passed through the heat exchanger related to heat medium 25a passes through the second refrigerant flow switching device 28a and is then transported to the outdoor unit 1.
  • the refrigerant transported to the outdoor unit 1 exchanges heat with the outside air in the heat source side heat exchanger 12 to become a low-temperature and low-pressure gas refrigerant, and then the first refrigerant flow switching device 11 and the accumulator 19 are turned on. Then, it is sucked into the compressor 10 again.
  • the opening degree of the first expansion device 26b is controlled so that the subcooling (supercooling degree) of the outlet refrigerant of the heat exchanger related to heat medium 25b becomes constant.
  • This subcool degree of subcooling
  • This subcool is obtained by converting the pressure of the heat source side refrigerant flowing between the heat exchanger related to heat medium 25b and the first expansion device 26b into a saturation temperature, and the outlet of the heat exchanger related to heat medium 25b. It is obtained as a difference from the temperature on the side.
  • the opening degree of the first expansion device 26a is controlled so that the superheat (superheat degree) of the refrigerant at the outlet of the heat exchanger related to heat medium 25 becomes constant.
  • This superheat degree of superheat is the value obtained by converting the pressure of the heat source side refrigerant flowing between the first expansion device 26a and the heat exchanger related to heat medium 25a into the saturation temperature, and the outlet side of the heat exchanger related to heat medium 25a. It is obtained as a difference from the temperature.
  • the heat medium pressurized by the drive of the pump 31b is sent to the use side heat exchanger 35a, exchanges heat with room air, heats the room, and then flows out of the use side heat exchanger 35a.
  • the heat medium flowing out from the use side heat exchanger 35a passes through the heat medium flow control device 34a, and then flows into and passes through the heat exchanger related to heat medium 25b.
  • the heat medium that has passed through the heat exchanger related to heat medium 25b is sucked into the pump 31b again, and then passes through the second heat medium flow switching device 33a and is sent into the use-side heat exchanger 35a.
  • the heat medium pressurized by the driving of the pump 31a is sent to the use side heat exchanger 35e, exchanges heat with room air, cools the room, and then flows out from the use side heat exchanger 35e.
  • the heat medium that has passed through the heat medium flow control device 34e passes through the heat medium flow control device 34e, and then flows into and passes through the heat exchanger related to heat medium 25a.
  • the heat medium that has passed through the heat exchanger related to heat medium 25a is again sucked into the pump 31a, and then passes through the second heat medium flow switching device 33e and is sent to the use-side heat exchanger 35e.
  • FIG. 11 is a diagram (part 1) illustrating the flow of the heat-source-side refrigerant and the flow of the heat medium during the heating-main operation in the mixed operation in the air-conditioning apparatus 100 illustrated in FIG.
  • the flow of the heat source side refrigerant in the refrigerant circuit A in this configuration is as described in FIG.
  • the flow of the heat medium in the heat medium circuit B is as described in FIG. That is, there is a flow of the above (1) and (2).
  • the indoor units 3a to 3d connected to the relay unit 2A, the indoor unit 3h connected to the branch unit 60, and the indoor units 3a to 3d connected to the relay unit 2B are the heating operation mode.
  • the flow of the heat medium is the same as the flow (2) described above with reference to FIG.
  • the heat medium circulates between the heat exchanger related to heat medium (here, the condenser) 25b of the relay unit 2A and the indoor units 3a to 3d connected to the relay unit 2A, thereby heating the room.
  • the heat medium circulates between the heat exchangers between heat medium (here, the evaporator) 25a of the relay unit 2A and the indoor units 3e to 3g connected to the branch unit 60, thereby cooling the room.
  • heat is generated between the heat exchanger (in this case, the condenser) 25b of the relay unit 2B and the indoor unit 3h connected to the branch unit 60 and the indoor units 3a to 3d connected to the relay unit 2B.
  • the medium circulates and heats the room.
  • the point that the heat medium flow control device 34 is controlled to have the heat medium flow rate necessary to cover the air conditioning load required indoors is the same as described above.
  • the above heat medium flow is an example.
  • the indoor units 3a to 3d connected to the relay units 2A and 2B have condensers in the relay units 2A and 2B to which they are connected depending on whether they operate in the heating operation mode or the cooling operation mode. As long as it is selectively connected to either the heat exchanger related to heat medium 25b that functions as the heat exchanger 25b or the heat exchanger related to heat medium 25a that functions as the evaporator. The same applies to each of the indoor units 3e to 3h connected to the branch unit 60, and functions as a condenser in the two relay units 2 depending on whether the operation is performed in the heating operation mode or the cooling operation mode.
  • connection pipe 70 One of the two heat exchangers 25b between the heat exchangers 25b and one of the two heat exchangers 25a between the heat exchangers 25a functioning as an evaporator in the two relay units 2 are connected via a connection pipe 70. Can be selectively connected.
  • the relay unit 2B is driven so that the flow of the heat source side refrigerant in the refrigerant circuit A in the relay unit 2B is the flow described in FIG. 10, and the connection destinations of the indoor units 3e to 3h are connected to the relay unit. It is only necessary to switch from 2A to the heat exchanger related to heat medium 25a functioning as an evaporator in the relay unit 2B.
  • FIG. 12 is a diagram (part 2) illustrating the flow of the heat-source-side refrigerant and the flow of the heat medium during the heating-main operation in the mixed operation in the air-conditioning apparatus 100 illustrated in FIG.
  • One of the two outdoor units 1A and 1B installed, a relay unit 2B connected to the outdoor unit 1 (here, 1B), and indoor units 3a to 3d connected to the relay unit 2B The heating main operation mode when all are stopped will be described.
  • a part of the indoor units 3a to 3d connected to the relay unit 2A and the indoor units 3e to 3h connected to the branch unit 60 (in this case, the indoor units 3a to 3d connected to the relay unit 2A) Is a heating operation mode, and the rest (in this case, the indoor units 3e to 3h connected to the branch unit 60) is in the cooling operation mode.
  • tube represented by the thick line has shown the piping through which the heat source side refrigerant
  • the flow direction of the heat source side refrigerant is indicated by a solid line arrow
  • the flow direction of the heat medium is indicated by a dotted line arrow.
  • the flow of the heat source side refrigerant in the refrigerant circulation circuit A is the same as the flow in the [mixed operation mode (heating main operation mode)] described in FIG.
  • the flow of the heat medium in the heat medium circuit B is the same as the flow described in FIG. That is, the heat medium circulates between the heat exchanger (in this case, the condenser) 25b of the relay unit 2A and the indoor units 3a to 3d connected to the relay unit 2A. Then, the heat medium exchanges heat with the room air in the use side heat exchangers 35a to 35d, thereby heating the room where the indoor units 3a to 3d are respectively installed. Further, the heat medium circulates between the heat medium heat exchanger (here, the evaporator) 25a of the relay unit 2A and the indoor units 3e to 3h connected to the branch unit 60.
  • the heat medium heat exchanger here, the condenser
  • the heat medium exchanges heat with indoor air in the use side heat exchangers 35e to 35h, whereby the room in which the indoor units 3e to 3h are respectively installed is cooled.
  • the heat medium flow rate adjusting devices 34a to 34h are controlled so as to have a heat medium flow rate necessary to cover the air conditioning load required indoors.
  • Each of the indoor units 3a to 3d connected to the relay unit 2A operates as a condenser in the relay unit 2A to which the indoor units 3a to 3d operate in the heating operation mode or the cooling operation mode. It may be selectively connected to either the intermediate heat exchanger 25b or the intermediate heat exchanger 25 functioning as an evaporator. The same applies to each of the indoor units 3e to 3h connected to the branch unit 60, and heat that functions as a condenser in the relay unit 2A depending on whether the operation is performed in the heating operation mode or the cooling operation mode.
  • the medium heat exchanger 25b and the heat medium heat exchanger 25 functioning as an evaporator may be selectively connected via the connection pipe 70.
  • the outdoor unit 1 can be added by connecting the branch unit 60 to the connection port 2 a for connecting the branch unit provided in the relay unit 2. Since the branch unit 60 is simply configured with a switching device and does not have a heat exchanger or the like, a minimum necessary system configuration can be realized when the indoor unit 3 is added. As a result, it is possible to improve the convenience, workability, and economy of the system.
  • the total air-conditioning capacity of all the indoor units 3 in operation is allocated, for example, approximately half by half. It is possible to appropriately select the connection destination as the heat exchanger related to heat medium 25a or the heat exchanger related to heat medium 25b. Therefore, it is possible to suppress the inconvenience that shortage occurs due to the transfer power required for the two pumps 31a and 31b being biased to either one.
  • the pumps 31a and 31b are used for cooling or heating only. For this reason, the connection destination of each indoor unit 3 cannot be distributed according to the air conditioning capacity.
  • the branch unit 60 is connected across a plurality of relay units 2, the pumps 31a and 31b of the plurality of relay units 2 can be used as conveyance power. Therefore, efficient air conditioning can be realized by using the pumps 31a and 31b of each relay unit 2.
  • an opening / closing valve is provided to the connection pipe 70 connected to each relay unit 2 to perform the opening / closing operation.
  • the connection pipe 70 What is necessary is just to close the provided on-off valve and to prevent the inflow of the heat medium.
  • the air conditioner 100 is further provided to the first heat medium flow switching device 32, the second heat medium flow switching device 33, the heat medium flow control device 34, and the connection pipe 70 in the branch unit 60.
  • a temperature sensor and a control device for performing operation control on the on-off valve may be further provided.
  • the second refrigerant flow switching device 28 has been described as an example of a four-way valve. However, the second refrigerant flow switching device 28 is not limited thereto, and a plurality of two-way flow switching valves or three-way flow switching valves are used. The refrigerant may flow in the same manner as when a four-way valve is used.
  • the heat medium flow control device 34 is built in the relay unit 2
  • the heat medium flow control device 34 may be built in the indoor unit 3, or may not be built in the relay unit 2 and the indoor unit 3, but may be installed outside the casing of these units.
  • the heat source side heat exchanger 12 and the use side heat exchanger 35 are provided with a blower, and in many cases, condensation or evaporation is promoted by blowing air, but it is not limited thereto.
  • the use-side heat exchanger 35 a panel heater using radiation can be used.
  • the heat source side heat exchanger 12 a water-cooled type that moves heat by water or antifreeze can also be used. That is, the heat source side heat exchanger 12 and the use side heat exchanger 35 can be used regardless of the type as long as they have a structure capable of radiating heat or absorbing heat.
  • each of the use side heat exchanger 35 and the heat medium flow control device 34 connected to the relay unit 2 is four, the number is not limited to four, and the use side heat exchange is not limited to four.
  • One set or more may be used as the set of the vessel 35 and the heat medium flow control device 34. The same applies to the use side heat exchanger 35 and the heat medium flow control device 34 connected to the branch unit 60.
  • the branch unit 60 straddles the two relay units 2 has been described, but the number of the relay units 2 is not limited to two and may be more than one.
  • the branch unit 60 is configured to include the same number of connection portions 61 as the number of relay units 2 to be connected. Then, the heat medium from each relay unit 2 may be appropriately switched and circulated to the use side heat exchanger 35 connected to the branch unit 60.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Other Air-Conditioning Systems (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

L'invention concerne un dispositif de climatisation pourvu d'une unité d'embranchement (60) pour l'ajout d'échangeurs de chaleur du côté utilisation. L'unité d'embranchement (60) est pourvue de : une section de raccordement (61), qui est raccordée par l'intermédiaire de conduites de raccordement (70) à un orifice de raccordement (2a) utilisé pour le raccordement de l'unité d'embranchement dans une unité relais (2) et dans laquelle passe un fluide caloporteur dans un circuit de circulation de fluide caloporteur (B) ; une section d'embranchement (62), qui est raccordée à un ou plusieurs échangeurs de chaleur du côté utilisation supplémentaires (35e à 35h) et qui dérive le fluide caloporteur circulant dans l'unité d'embranchement (60) par l'intermédiaire de la section de raccordement (61) et fait circuler le fluide caloporteur vers le ou les échangeurs de chaleur du côté utilisation supplémentaires (35e à 35h) ; et des moyens de commutation de seconde voie de passage de fluide caloporteur (des premiers dispositifs de commutation de voie de passage de fluide caloporteur 32e à 32h, des seconds dispositifs de commutation de voie de passage de fluide caloporteur 33e à 33h et des dispositifs de commutation de voie de passage de fluide caloporteur 34e à 34h), qui sont disposés en correspondance avec le ou les échangeurs de chaleur du côté utilisation supplémentaires (35e à 35h) et qui raccordent le ou les échangeurs de chaleur du côté utilisation supplémentaires (35e à 35h) à l'un de multiples échangeurs de chaleur entre fluides caloporteurs (25a, 25b).
PCT/JP2015/050574 2015-01-13 2015-01-13 Dispositif de climatisation WO2016113830A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB1710186.6A GB2548522B (en) 2015-01-13 2015-01-13 Air-conditioning apparatus
JP2016569138A JP6429901B2 (ja) 2015-01-13 2015-01-13 空気調和装置
PCT/JP2015/050574 WO2016113830A1 (fr) 2015-01-13 2015-01-13 Dispositif de climatisation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2015/050574 WO2016113830A1 (fr) 2015-01-13 2015-01-13 Dispositif de climatisation

Publications (1)

Publication Number Publication Date
WO2016113830A1 true WO2016113830A1 (fr) 2016-07-21

Family

ID=56405398

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2015/050574 WO2016113830A1 (fr) 2015-01-13 2015-01-13 Dispositif de climatisation

Country Status (3)

Country Link
JP (1) JP6429901B2 (fr)
GB (1) GB2548522B (fr)
WO (1) WO2016113830A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108731127A (zh) * 2018-06-06 2018-11-02 青岛海信日立空调系统有限公司 一种多管式多联机室外机及其管路检测方法和检测装置
WO2020066015A1 (fr) * 2018-09-28 2020-04-02 三菱電機株式会社 Climatiseur

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011114368A1 (fr) * 2010-03-16 2011-09-22 三菱電機株式会社 Dispositif de conditionnement d'air
WO2014024276A1 (fr) * 2012-08-08 2014-02-13 三菱電機株式会社 Dispositif de climatisation
WO2014045358A1 (fr) * 2012-09-20 2014-03-27 三菱電機株式会社 Dispositif de climatiseur
WO2014097440A1 (fr) * 2012-12-20 2014-06-26 三菱電機株式会社 Dispositif de climatisation

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0638249Y2 (ja) * 1989-11-25 1994-10-05 ダイキン工業株式会社 空気調和機の配管分岐装置
JP5490245B2 (ja) * 2010-09-10 2014-05-14 三菱電機株式会社 空気調和装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011114368A1 (fr) * 2010-03-16 2011-09-22 三菱電機株式会社 Dispositif de conditionnement d'air
WO2014024276A1 (fr) * 2012-08-08 2014-02-13 三菱電機株式会社 Dispositif de climatisation
WO2014045358A1 (fr) * 2012-09-20 2014-03-27 三菱電機株式会社 Dispositif de climatiseur
WO2014097440A1 (fr) * 2012-12-20 2014-06-26 三菱電機株式会社 Dispositif de climatisation

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108731127A (zh) * 2018-06-06 2018-11-02 青岛海信日立空调系统有限公司 一种多管式多联机室外机及其管路检测方法和检测装置
CN108731127B (zh) * 2018-06-06 2020-09-04 青岛海信日立空调系统有限公司 一种多管式多联机室外机及其管路检测方法和检测装置
WO2020066015A1 (fr) * 2018-09-28 2020-04-02 三菱電機株式会社 Climatiseur
JPWO2020066015A1 (ja) * 2018-09-28 2021-08-30 三菱電機株式会社 空気調和機
JP7034319B2 (ja) 2018-09-28 2022-03-11 三菱電機株式会社 空気調和機
US11802724B2 (en) 2018-09-28 2023-10-31 Mitsubishi Electric Corporation Air-conditioning apparatus with simultaneous heating and defrosting modes

Also Published As

Publication number Publication date
GB2548522A (en) 2017-09-20
JP6429901B2 (ja) 2018-11-28
GB201710186D0 (en) 2017-08-09
GB2548522B (en) 2020-09-16
JPWO2016113830A1 (ja) 2017-07-06

Similar Documents

Publication Publication Date Title
JP6385436B2 (ja) 空気調和装置
JP6192706B2 (ja) 空気調和装置
JP6141454B2 (ja) 空気調和装置及び空気調和装置の制御方法
JP5752148B2 (ja) 空気調和装置
JP5452628B2 (ja) 空気調和装置
JP5784117B2 (ja) 空気調和装置
JP6095764B2 (ja) 空気調和装置
JP5236080B2 (ja) 空気調和装置
JP5595521B2 (ja) ヒートポンプ装置
WO2013069351A1 (fr) Appareil de conditionnement d'air
WO2012172731A1 (fr) Climatiseur
JP6490232B2 (ja) 空気調和装置
JP2017190946A (ja) 空気調和装置
JP5972397B2 (ja) 空気調和装置、その設計方法
JP6429901B2 (ja) 空気調和装置
JP5985037B2 (ja) 空気調和装置
WO2015087421A1 (fr) Climatiseur
JP6062030B2 (ja) 空気調和装置
WO2023007700A1 (fr) Climatiseur
WO2022162864A1 (fr) Dispositif de climatisation
JP5885753B2 (ja) 空気調和装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15877785

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2016569138

Country of ref document: JP

Kind code of ref document: A

ENP Entry into the national phase

Ref document number: 201710186

Country of ref document: GB

Kind code of ref document: A

Free format text: PCT FILING DATE = 20150113

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15877785

Country of ref document: EP

Kind code of ref document: A1