WO2006013769A1 - 空気調和装置 - Google Patents
空気調和装置 Download PDFInfo
- Publication number
- WO2006013769A1 WO2006013769A1 PCT/JP2005/013814 JP2005013814W WO2006013769A1 WO 2006013769 A1 WO2006013769 A1 WO 2006013769A1 JP 2005013814 W JP2005013814 W JP 2005013814W WO 2006013769 A1 WO2006013769 A1 WO 2006013769A1
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- WO
- WIPO (PCT)
- Prior art keywords
- refrigerant
- heat source
- source side
- heat exchanger
- compression mechanism
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/007—Compression machines, plants or systems with reversible cycle not otherwise provided for three pipes connecting the outdoor side to the indoor side with multiple indoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
- F25B2313/0231—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units with simultaneous cooling and heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/04—Refrigeration circuit bypassing means
- F25B2400/0401—Refrigeration circuit bypassing means for the compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/13—Economisers
Definitions
- the present invention includes an air conditioner, and in particular, includes a heat source side heat exchange configured so that the refrigerant flows in from the lower side and flows out from the upper side when functioning as an evaporator of the refrigerant.
- the present invention relates to an air conditioner including a refrigerant circuit capable of switching so that a heat source side heat exchange and a use side heat exchange function individually as a refrigerant evaporator or a condenser.
- a refrigerant evaporator there is a refrigeration apparatus provided with a vapor compression refrigerant circuit having a heat exchange configured such that a refrigerant flows in a lower force and an upper force flows out (for example, a patent) (Refer to Reference 1.)
- the specific gravity is lower than that of the refrigerant in order to prevent the refrigeration oil from accumulating in the evaporator, so it is separated into two layers and floats above the liquid level of the refrigerant.
- Refrigerating machine oil accumulated in a hot state is extracted near the refrigerant level and returned to the suction side of the compressor.
- the heat source side heat exchanger and the use side heat exchanger can be switched to individually function as a refrigerant evaporator or condenser, respectively.
- a refrigerant evaporator or condenser for example, refer to Patent Document 2.
- An expansion valve is provided so that the flow rate of the refrigerant flowing into each heat source side heat exchanger can be adjusted.
- the air conditioning load of the use side heat exchange ⁇ In response to the reduction, the control is performed to reduce the evaporation capacity by reducing the opening of the expansion valve. Further, when the air conditioning load of the use side heat exchanger is very small, a plurality of expansion valves are used.
- the air conditioning load of the use side heat exchanger is As the temperature decreases, the opening of the expansion valve connected to the heat source side heat exchanger is reduced to increase the amount of liquid refrigerant that accumulates in the heat source side heat exchanger, thereby reducing the substantial heat transfer area.
- the control is performed to reduce the condensation capacity by decreasing it.
- the refrigerant pressure on the downstream side of the expansion valve (specifically, between the expansion valve and the use-side heat exchanger) tends to decrease and stabilizes.
- Patent Document 2 JP-A-3-260561
- Patent Document 3 Japanese Patent Laid-Open No. 3-129259
- the heat exchange such as plate heat exchange configured so that the refrigerant flows into the lower force and flows out into the upper force. It may be used as a heat exchanger.
- the heat exchanger on the heat source side functions as an evaporator having a low evaporation capacity, such as when the air conditioning load in the heat exchange on the user side is very small, the opening of the expansion valve is reduced.
- the restriction level of the refrigerant level in the heat source side heat exchanger cannot reduce the opening degree of the expansion valve.
- the evaporation capacity cannot be controlled sufficiently, and as a result, the evaporation capacity can be reduced by closing some of the expansion valves and reducing the number of heat source side heat exchangers ⁇ that function as evaporators.
- a part of the heat source side heat exchange ⁇ functions as a condenser to function as an evaporator. It is necessary to control to reduce the evaporation capacity by offsetting the evaporation capacity of the functioning heat source side heat exchanger.
- the number of parts is increased and the cost is increased by installing a plurality of heat source side heat exchangers, and a part of the plurality of heat source side heat exchangers functions as a condenser to evaporate capacity. Therefore, the amount of refrigerant compressed in the compressor will increase by the amount of refrigerant condensed in the heat source side heat exchanger, and the air conditioning load on the use side heat exchanger ⁇ There is a problem that COP gets worse.
- the heat source side heat exchanger can be made to function as an evaporator with a small evaporation capability while allowing the liquid level to be lowered without providing a heat source side heat exchange to offset the evaporation capability.
- the heat source side heat exchange functions as a refrigerant condenser by providing a pressure circuit in the refrigerant circuit
- the pressure is reduced over the expansion valve. If the high-pressure gas refrigerant compressed by the compressor is combined with the refrigerant sent to the user-side heat exchanger, the refrigerant sent from the expansion valve to the user-side heat exchanger becomes a gas-liquid two-phase flow.
- the opening force of the expansion valve decreases, the gas fraction of the refrigerant after the pressurized circuit force and high-pressure gas refrigerant are merged increases, and drift occurs between the plurality of use-side heat exchangers.
- the opening degree of the expansion valve cannot be made sufficiently small.
- a plurality of heat source side heat exchangers are provided, and when the air conditioning load of the use side heat exchanger is extremely small, Reduce the condensation capacity by closing the expansion valve and reducing the number of heat source side heat exchangers that function as condensers, or allow some of the heat source side heat exchangers to function as evaporators Therefore, it is necessary to control to reduce the condensing capacity by offsetting the condensing capacity of the heat source side heat exchanger functioning as a condenser.
- An object of the present invention includes a heat source side heat exchange configured such that when the refrigerant functions as a refrigerant evaporator, the refrigerant flows in the lower force and flows out of the upper cover,
- the air conditioner is equipped with a refrigerant circuit that can be switched so that the heat exchanger on the use side individually functions as a refrigerant evaporator or condenser. The purpose of this is to expand the control range when controlling by the expansion valve.
- An air conditioner includes a refrigerant circuit, a first bypass circuit, and an oil return circuit.
- the refrigerant circuit includes a compression mechanism, a heat source side heat exchanger configured such that when the refrigerant functions as a refrigerant evaporator, the refrigerant flows in from the lower side and flows out from the upper side, the heat exchanger on the use side, and the heat source.
- It includes a liquid refrigerant pipe connecting the side heat exchanger and the use side heat exchanger, and an expansion valve provided in the liquid refrigerant pipe, so that the heat source side heat exchange ⁇ and the use side heat exchange ⁇ respectively.
- the first bin circuit can bypass the refrigerant that also discharges the compression mechanism force to the suction side of the compression mechanism.
- the oil return circuit connects the lower part of the heat source side heat exchanger and the suction side of the compression mechanism.
- the air conditioner bypasses the refrigerant that also discharges the compression mechanism force through the first bypass circuit to the suction side of the compression mechanism when operating with the heat source side heat exchanger functioning as an evaporator.
- the operation is switched to the operation in which the heat source side heat exchange functions as a condenser, and the expansion valve is closed so that the refrigerant discharged from the compression mechanism flows into the heat source side heat exchanger, and the heat source is supplied via the oil return circuit.
- Oil recovery operation is performed to return the refrigeration oil accumulated in the side heat exchanger to the suction side of the compression mechanism.
- the refrigerant discharged from the compression mechanism is After being condensed in the heat exchange and passing through the expansion valve, it is sent to the heat exchange on the user side. This refrigerant is sucked into the compression mechanism after being evaporated in the use side heat exchange. .
- the refrigerant discharged from the compression mechanism is condensed in the use side heat exchanger. After passing through the expansion valve, it is sent to the heat source side heat exchanger.
- This refrigerant is sucked into the compression mechanism after being evaporated in the heat source side heat exchanger.
- the refrigerant flows in the heat source side heat exchange so that the refrigerant flows in from the lower side and flows out of the upper side force. If control is performed to reduce the evaporation capacity of the heat source side heat exchanger by reducing the opening of the expansion valve according to the air conditioning load, the refrigeration oil will accumulate in the heat source side heat exchanger.
- the refrigerant that also discharges the compression mechanism force through the first bypass circuit is used as the suction side of the compression mechanism.
- the refrigerant discharged from the compression mechanism flows into the heat source side heat exchanger, and the oil return circuit is Oil recovery operation is performed to return the refrigeration oil accumulated in the heat source side heat exchanger to the suction side of the compression mechanism.
- the heat flow on the heat source side is switched to function as a condenser, but the use side heat exchanger is switched to the evaporator to change the direction of the refrigerant flow in the entire refrigerant circuit. Therefore, it is possible to quickly start up after returning to the operating state before the oil recovery operation after the oil recovery operation, and the squeezing force that impairs indoor comfort is also short. Refrigerating machine oil accumulated in the heat source side heat exchanger over time can be recovered.
- control is performed to reduce the evaporation capacity of the heat source side heat exchanger by reducing the opening of the expansion valve in accordance with the air conditioning load of the use side heat exchange ⁇
- refrigeration oil does not accumulate in the heat source side heat exchanger even if the refrigerant level in the heat source side heat exchanger decreases, so the evaporation capacity of the heat source side heat exchange is controlled by the expansion valve. This makes it possible to expand the control range when doing so.
- this air conditioner when a plurality of heat source side heat exchangers are provided and the heat source side heat exchange functions as an evaporator as in the conventional air conditioner, one of the plurality of heat source side expansion valves is used.
- the evaporation capacity can be reduced, or some of the heat source side heat exchangers ⁇ can function as condensers. This eliminates the need for control to reduce the evaporation capacity by offsetting the evaporation capacity of the heat source side heat exchanger functioning as an evaporator.Therefore, a single heat source side heat exchanger ⁇ A control range can be obtained.
- An air conditioner includes a refrigerant circuit, a first bypass circuit, and an oil return circuit.
- the refrigerant circuit includes a compression mechanism, a heat source side heat exchanger configured such that when the refrigerant functions as a refrigerant evaporator, the refrigerant flows in from the lower side and flows out from the upper side, the heat exchanger on the use side, and the heat source.
- a liquid refrigerant pipe connecting the side heat exchanger and the use side heat exchanger, an expansion valve provided in the liquid refrigerant pipe, and the heat source side heat exchanger to function as a condenser for refrigerant discharged from the compression mechanism A heat source side switching mechanism that enables switching between a condensing operation switching state and an evaporation operation switching state that causes the heat source side heat exchanger to function as a refrigerant evaporator flowing in the liquid refrigerant pipe; and a discharge mechanism and a heat source side switching mechanism of the compression mechanism And a high-pressure gas refrigerant pipe that can branch before the refrigerant discharged from the compression mechanism flows into the heat source side switching mechanism, and a refrigerant that flows through the liquid refrigerant pipe through the use side heat exchanger.
- Cooling operation switching state to function as an evaporator and user side heat exchange Functioning as a condenser for the refrigerant flowing in the high-pressure gas refrigerant pipe, and switching between the heating operation switching state and the refrigerant evaporated in the utilization side heat exchanger on the suction side of the compression mechanism
- the first bypass circuit can bypass the refrigerant discharged from the compression mechanism cover to the suction side of the compression mechanism.
- the oil return circuit connects the lower part of the heat source side heat exchanger and the suction side of the compression mechanism.
- the air conditioner is configured to supply the refrigerant that also discharges the compression mechanism force through the first bypass circuit when the heat source side switching mechanism is operated in the evaporation operation switching state.
- this air conditioner in the case of performing an operation that causes the heat source side heat exchange to function as a refrigerant condenser by switching the heat source side Kiriura structure to the condensing operation switching state, such as when performing a cooling operation or the like.
- the refrigerant discharged from the compression mechanism is sent to the heat source side heat exchanger and condensed in the heat source side heat exchanger.
- this refrigerant is sent to the use side heat exchanger through the liquid refrigerant pipe.
- the refrigerant is evaporated in the use side heat exchanger functioning as a refrigerant evaporator by setting the use side switching mechanism to the cooling operation switching state, and then sucked into the compression mechanism through the low-pressure gas refrigerant pipe.
- the discharge from the compression mechanism is performed.
- the refrigerant is sent through the high-pressure gas refrigerant pipe to the user-side heat exchanger that functions as a refrigerant condenser by switching the use-side mechanism to the heating operation switching state, and is condensed to the liquid refrigerant pipe. Sent. Then, after passing through the expansion valve, the refrigerant is evaporated in the heat source side heat exchange and sucked into the compression mechanism.
- the refrigerant flows through the heat source side heat exchanger so that the lower force flows in and the upper force flows out. If control is performed to reduce the evaporation capacity of the heat source side heat exchanger by reducing the opening of the expansion valve in accordance with the air conditioning load in the cooler, the refrigeration oil will accumulate in the heat source side heat exchanger.
- control is performed to reduce the evaporation capacity of the heat source side heat exchanger by reducing the opening degree of the expansion valve in accordance with the air conditioning load of the use side heat exchange.
- refrigeration oil does not accumulate in the heat source side heat exchanger even if the refrigerant level in the heat source side heat exchanger decreases, so the evaporation capacity of the heat source side heat exchange is controlled by the expansion valve. It is possible to expand the control width at the time.
- An air conditioner according to a third invention is the air conditioner according to the first or second invention, wherein the liquid refrigerant pipe is connected between the use side heat exchanger and the expansion valve.
- a second bypass circuit is provided that can branch the refrigerant from the liquid cooling pipe and send it to the suction side of the compression mechanism.
- the refrigerant can flow to the heat exchanger on the user side that functions as a condenser even during oil recovery operation, and heating Driving can be continued.
- An air conditioner according to a fourth aspect of the invention is the air conditioner according to the third aspect of the invention, wherein the liquid refrigerant pipe is connected between the use side heat exchanger and the expansion valve, A receiver for storing the refrigerant flowing through the refrigerant pipe is further provided.
- the second bypass circuit is provided to send the refrigerant from the upper part of the receiver to the suction side of the compression mechanism.
- the second bypass circuit is provided so that the upper force of the receiver also sends the refrigerant to the suction side of the compression mechanism, the refrigerant in the gas state is preferentially sent to the suction side of the compression mechanism, and the liquid It is possible to prevent the refrigerant in the state from being sent as much as possible.
- An air conditioner according to a fifth aspect of the present invention is the air conditioner according to any of the first to fourth aspects of the invention, wherein the heat source side heat exchanger controls the flow rate of the refrigerant flowing in the heat source side heat exchanger. Regardless of the control, a certain amount of water is used as a heat source.
- this air conditioner In this air conditioner, a constant amount of water is used as the heat source regardless of the flow rate of the refrigerant flowing in the heat source side heat exchanger, and the evaporation capacity in the heat source side heat exchange is controlled by controlling the amount of water. Can not control. However, in this air conditioner, the control range when controlling the evaporation capacity of the heat source side heat exchange by the expansion valve has been expanded, so even without controlling the amount of water, the heat source side heat exchanger It is possible to maintain a control range when controlling the evaporation capacity of the liquid.
- An air conditioner according to a sixth aspect of the present invention is the air conditioner according to any of the first to fifth aspects of the invention, wherein the heat source side heat exchange is plate type heat exchange.
- the air conditioner uses a plate heat exchanger in which a large number of flow paths are formed as heat source side heat exchange, and because of its structure, refrigerating machine oil is prevented from collecting in the heat source side heat exchanger. Therefore, it is difficult to provide an oil return circuit for extracting refrigeration oil in each flow path of the heat source side heat exchanger.
- the refrigerating machine oil accumulated in the heat source side heat exchange can be extracted so as to push out the lower force of the heat source side heat exchange with the refrigerant that has also flowed in the upper force of the heat source side heat exchange. Therefore, it is easy to install an oil return circuit even when using plate heat exchanger.
- the air conditioner according to the seventh invention includes a refrigerant circuit and an oil return circuit.
- the refrigerant circuit consists of a compression mechanism and a heat source side heat exchanger configured so that when the refrigerant functions as a refrigerant evaporator, the refrigerant flows in from the lower side and flows out from the upper side, and the user side heat exchangers. And the heat source side heat exchanger and the use side heat exchanger can be switched to function individually as a refrigerant evaporator or a condenser.
- the oil return circuit connects the lower part of the heat source side heat exchanger and the suction side of the compression mechanism.
- this air conditioner when operated with the heat source side heat exchanger functioning as an evaporator, it switches to the operation that causes the heat source side heat exchange to function as a condenser, and the compression mechanism force is also discharged.
- the refrigerant is supplied to the heat source side heat exchanger and the refrigeration oil accumulated in the heat source side heat exchanger is returned to the suction side of the compression mechanism through the oil return circuit.
- the use-side heat exchange is switched to the evaporator to switch the refrigerant flow in the entire refrigerant circuit, even though the heat source-side heat exchanger is switched to function as a condenser. Therefore, it is possible to quickly start up after returning to the operating state before the oil recovery operation, without compromising the comfort of the room. Refrigerating machine oil accumulated in the heat source side heat exchanger over time can be recovered.
- An air conditioner according to an eighth aspect of the present invention is the air conditioner according to the seventh aspect of the present invention, wherein the first bypass circuit capable of bypassing the refrigerant that also discharges the compression mechanism force to the suction side of the compression mechanism. It has more. During the oil recovery operation, the refrigerant discharged from the compression mechanism via the first bypass circuit is bypassed to the suction side of the compression mechanism.
- the refrigerant that also discharges the compression mechanism force is bypassed to the suction side of the compression mechanism via the first bypass circuit, so that the suction pressure of the compression mechanism can be secured. it can. Moreover, it is returned to the suction side of the compression mechanism through the oil return circuit. Since the refrigeration oil to be mixed is mixed with the high-pressure gas refrigerant bypassed through the first bypass circuit, liquid compression in the compression mechanism can be prevented.
- FIG. 1 is a schematic refrigerant circuit diagram of an air conditioner according to an embodiment of the present invention.
- FIG. 2 is a diagram showing the overall schematic structure of a heat source side heat exchanger.
- FIG. 3 is an enlarged view of a portion C in FIG. 2, and shows a schematic structure of the lower part of the heat source side heat exchanger.
- FIG. 4 is a schematic refrigerant circuit diagram for explaining the operation of the air-conditioning apparatus in a heating operation mode.
- FIG. 5 is a schematic refrigerant circuit diagram for explaining the operation of oil recovery operation in the heating operation mode of the air conditioner.
- FIG. 6 is a schematic refrigerant circuit diagram for explaining the operation of the air-conditioning apparatus in a cooling operation mode.
- FIG. 7 is a schematic refrigerant circuit diagram for explaining the operation of the air-conditioning apparatus in the simultaneous heating / cooling operation mode (evaporation load).
- FIG. 8 is a schematic refrigerant circuit diagram for explaining the operation of the oil recovery operation in the simultaneous cooling and heating operation mode (evaporation load) of the air conditioner.
- FIG. 9 is a schematic refrigerant circuit diagram for explaining the operation of the air-conditioning apparatus in the simultaneous heating and cooling operation mode (condensation load).
- FIG. 10 is a schematic refrigerant circuit diagram of an air-conditioning apparatus according to Modification 1.
- FIG. 11 is a schematic refrigerant circuit diagram of an air-conditioning apparatus according to Modification 2.
- FIG. 12 is a schematic refrigerant circuit diagram of an air-conditioning apparatus according to Modification 3.
- Heat source side heat exchanger 24 Heat source side expansion valve (expansion valve)
- FIG. 1 is a schematic refrigerant circuit diagram of an air-conditioning apparatus 1 according to an embodiment of the present invention.
- the air conditioner 1 is an apparatus used for indoor air conditioning such as a building by performing a vapor compression refrigeration cycle operation.
- the air conditioner 1 mainly includes one heat source unit 2, a plurality (three in this embodiment) of usage units 3, 4, 5, and connection units connected to the usage units 3, 4, 5. 6, 7, 8, and refrigerant connection pipes 9, 10, 11 connecting the heat source unit 2 and the utilization units 3, 4, 5 via the connection units 6, 7, 8, for example, an air conditioner Simultaneous cooling and heating operation is possible according to the requirements of the indoor air-conditioning space where the usage units 3, 4, and 5 are installed, such as cooling the space and heating the other air-conditioned spaces It is configured to be. That is, the vapor compression refrigerant circuit 12 of the air conditioner 1 of the present embodiment includes a heat source unit 2, utilization units 3, 4, 5, connection units 6, 7, 8, and refrigerant communication pipes 9, 10, 11 is connected.
- Usage units 3, 4, and 5 are installed in the ceiling of a building or the like by suspending or hanging, or hanging on the wall of the building.
- the utilization units 3, 4, 5 are connected to the heat source unit 2 via the refrigerant communication pipes 9, 10, 11 and the connection units 6, 7, 8, and constitute a part of the refrigerant circuit 12.
- the configuration of usage units 3, 4, and 5 will be described. Since the usage unit 3 and the usage units 4 and 5 have the same configuration, only the configuration of the usage unit 3 will be described here, and the configuration of the usage units 4 and 5 will be described respectively. Instead of the numbers in the 30s indicating the parts in 3, the symbols in the 40s or 50s are attached, and the description of each part is omitted.
- the usage unit 3 mainly constitutes a part of the refrigerant circuit 12, and includes a usage-side refrigerant circuit 12a (in the usage units 4 and 5, usage-side refrigerant circuits 12b and 12c, respectively).
- the use side refrigerant circuit 12a mainly includes a use side expansion valve 31 and a use side heat exchange 32.
- the use side expansion valve 31 is an electric expansion valve connected to the liquid side of the use side heat exchanger 32 in order to adjust the flow rate of the refrigerant flowing in the use side refrigerant circuit 12a. is there.
- the use side heat exchanger 32 is a cross-fin type fin 'and' tube type heat exchanger composed of heat transfer tubes and a large number of fins, and exchanges heat between the refrigerant and indoor air. It is a device for performing.
- the utilization unit 3 includes a blower fan (not shown) for supplying indoor air as supply air after sucking indoor air into the unit and exchanging heat. It is possible to exchange heat with the refrigerant flowing through the use side heat exchanger 32.
- the utilization unit 3 is provided with various sensors.
- a liquid side temperature sensor 33 for detecting the temperature of the liquid refrigerant is provided on the liquid side of the use side heat exchanger 32, and a gas side temperature for detecting the temperature of the gas refrigerant is provided on the gas side of the use side heat exchanger 32.
- Sensor 34 is provided.
- the utilization unit 3 is provided with an RA intake temperature sensor 35 for detecting the temperature of indoor air sucked into the unit.
- the usage unit 3 includes a usage-side control unit 36 that controls the operation of each unit constituting the usage unit 3.
- the use-side control unit 36 includes a microcomputer and a memory provided for controlling the use unit 3, and exchanges control signals and the like with a remote controller (not shown). Control signals etc. can be exchanged with the heat source unit 2.
- the heat source unit 2 is installed on the roof of a building, etc., and is connected to the usage units 3, 4, and 5 via the refrigerant communication pipes 9, 10, and 11, and between the usage units 3, 4, and 5,
- the refrigerant circuit 1 2 is configured. Next, the configuration of the heat source unit 2 will be described.
- the heat source unit 2 mainly constitutes a part of the refrigerant circuit 12, and includes a heat source side refrigerant circuit 12d.
- the heat source side refrigerant circuit 10d mainly includes a compression mechanism 21, a first switching mechanism 22, a heat source side heat exchanger 23, a heat source side expansion valve 24, a receiver 25, a second switching mechanism 26, Side closing valve 27, high pressure gas side closing valve 28, low pressure gas side closing valve 29, first oil return circuit 101, first bypass circuit 102, pressurization circuit 111, cooler 121, cooling Circuit 122.
- the compression mechanism 21 mainly includes a compressor 21a, an oil separator 21b connected to the discharge side of the compressor 21a, and a second oil return circuit 2 that connects the oil separator 21b and the suction pipe 21c of the compressor 21a 2 Id.
- the compressor 21a is a positive displacement compressor capable of varying the operating capacity by inverter control.
- the oil separator 21b is a container for separating the refrigerating machine oil accompanying the high-pressure gas refrigerant compressed and discharged in the compressor 21a.
- the second oil return circuit 21d is a circuit for returning the refrigeration oil separated in the oil separator 21b to the compressor 21a.
- the second oil return circuit 21d mainly includes an oil return pipe 21e that connects the oil separator 21b and the suction pipe 21c of the compressor 21a, and a high pressure separated in the oil separator 21b that is connected to the oil return pipe 21e. And a capillary tube 21f for reducing the pressure of the refrigerating machine oil.
- the capillary tube 21f is a thin tube that depressurizes the high-pressure refrigeration oil separated in the oil separator 21b to the refrigerant pressure on the suction side of the compressor 21a.
- the compression mechanism 21 has only one compressor 21a as a compressor, but is not limited to this, and two or more compressors are connected in parallel according to the number of connected units. It may have been done.
- the first shelf structure 22 is configured to connect the discharge side of the compression mechanism 21 and the gas side of the heat source side heat exchange 23 when the heat source side heat exchange 23 functions as a condenser (hereinafter referred to as a condensing operation switching state). Connect and connect the suction side of the compression mechanism 21 and the gas side of the heat source side heat exchanger 23 when the heat source side heat exchanger 23 functions as an evaporator (hereinafter referred to as the evaporation operation switching state).
- a four-way switching valve capable of switching the refrigerant flow path in the heat source side refrigerant circuit 12d, the first port 22a of which is connected to the discharge side of the compression mechanism 21, and the second port 22b of the heat source side refrigerant circuit 12d of the heat source side refrigerant circuit 12d. It is connected to the gas side of the side heat exchanger 23, its third port 22c is connected to the suction side of the compressor mechanism 21, and its fourth port 22d is pressurized via the capillary tube 91. It is connected to the suction side of the compression mechanism 21.
- the first switching mechanism 22 connects the first port 22a and the second port 22b, and connects the third port 22c and the fourth port 22d (corresponding to the condensing operation switching state, FIG. 1 (refer to the solid line of the first switching mechanism 22), or connect the second port 22b and the third port 22c, and connect the first port 22a and the fourth port 22d (corresponding to the evaporation operation switching state, It is possible to switch (see the broken line of the first switching mechanism 22 in FIG. 1).
- the heat source side heat exchanger 23 is a heat exchanger that can function as a refrigerant evaporator and a refrigerant condenser. In the present embodiment, plate heat exchange is performed in which heat is exchanged with the refrigerant using water as a heat source. It is a vessel.
- the gas side of the heat source side heat exchanger 23 is connected to the second port 22b of the first switching mechanism 22, and the liquid side is connected to the heat source side expansion valve 24.
- the heat source side heat exchanger 23 is formed by stacking a plurality of plate members 23a formed by a press cage or the like via a packing (not shown).
- a plurality of channels 23b and 23c extending in the vertical direction are formed in the plurality of channels, and refrigerant and water flow alternately in the channels 23b and 23c (specifically, the refrigerant flows in the channel 23b). Heat is exchanged by water flowing in the flow path 23c (see arrows A and B in FIG. 2).
- the plurality of flow paths 23b are in communication with each other at the upper end portion and the lower end portion thereof, and are connected to the gas side nozzle 23d and the liquid side nozzle 23e provided at the upper and lower portions of the heat source side heat exchange. ing.
- the gas side nozzle 23d is connected to the first structure 22, and the liquid side nozzle 23e is connected to the heat source side expansion valve 24.
- the heat source side heat exchanger 23 functions as an evaporator
- the refrigerant flows in from the liquid side nozzle 23e (ie, the lower side) and out of the gas side nozzle 23d (ie, the upper side).
- the heat source side heat exchanger 23 functions as a condenser
- the plurality of flow paths 23c are connected to each other at the upper end and the lower end, and are connected to the water inlet nozzle 23f and the water outlet nozzle 23g provided at the upper and lower portions of the heat source side heat exchanger 23. Has been.
- the water as the heat source is the water in the heat source side heat exchanger 23 through the water pipe (not shown) of the chilled water tower equipment and the boiler equipment power installed outside the air conditioner 1.
- Supply water CWS from the inlet nozzle 23f After flowing in and exchanging heat with the refrigerant, it flows out from the water outlet nozzle 23g and returns to the chilled water tower equipment and boiler equipment as discharged water CWR.
- a certain amount of water supplied from the cold water tower equipment or boiler equipment is supplied regardless of the flow rate of the refrigerant flowing in the heat source side heat exchanger 23.
- the heat source side expansion valve 24 is a flow rate of the refrigerant flowing between the heat source side heat exchanger 23 and the use side refrigerant circuits 12a, 12b, 12c via the liquid refrigerant communication pipe 9. This is an electric expansion valve that can be adjusted and connected to the liquid side of the heat exchange on the heat source side.
- the receiver 25 is a container for temporarily storing the refrigerant flowing between the heat source side heat exchanger 23 and the use side refrigerant circuits 12a, 12b, and 12c. In the present embodiment, the receiver 25 is connected between the heat source side expansion valve 24 and the cooler 121.
- the second Kiriura structure 26 is used when the heat source unit 2 is used as a heat source unit for a cooling and heating simultaneous machine, and when high-pressure gas refrigerant is sent to the use-side refrigerant circuits 12a, 12b, and 12c (hereinafter referred to as a heating load request).
- a heating load request high-pressure gas refrigerant is sent to the use-side refrigerant circuits 12a, 12b, and 12c
- the discharge side of the compression mechanism 21 and the high pressure gas side shut-off valve 28 are connected, and the heat source unit 2 is used as a heat source unit for a cooling / heating switching machine.
- Is a four-way switching valve capable of switching the refrigerant flow path in the heat source side refrigerant circuit 12d so as to connect the high pressure gas side closing valve 28 and the suction side of the compression mechanism 21, and its first port 26 a is connected to the discharge side of the compression mechanism 21, its second port 26 b is connected to the suction side of the compression mechanism 21 via a capillary tube 92, and its third port 26 c is connected to the compression mechanism 21. It is connected to the suction side and its fourth port 26d is high. Connected to the pressure gas side closing valve 28.
- the second mechanism 26 connects the first port 26a and the second port 26b and also connects the third port 26c and the fourth port 26d (corresponding to the cooling operation state during cooling / heating switching). (Refer to the solid line of the second structure 26 in Fig. 1), and the second port 26b and the third port 26c are connected, and the first port 26a and the fourth port 26d are connected (operational condition requiring heating load). Corresponding to (see the broken line of the second switching mechanism 26 in FIG. 1).
- the liquid side shut-off valve 27, the high-pressure gas side shut-off valve 28, and the low-pressure gas side shut-off valve 29 are provided at a connection port with an external device / pipe (specifically, the refrigerant communication pipes 9, 10 and 11). Valve.
- the liquid side closing valve 27 is connected to the cooler 121.
- the high pressure gas side stop valve 28 m «It is connected to the 4th port 26d of structure 26.
- the low pressure gas side closing valve 29 is connected to the suction side of the compression mechanism 21.
- the first oil return circuit 101 is configured to switch the refrigerating machine oil accumulated in the heat source side heat exchanger to the suction side of the compression mechanism 21 when the evaporation operation is switched, that is, when the heat source side heat exchanger 23 functions as an evaporator. This circuit is used for the oil recovery operation (described later) to be returned, and is provided to connect the lower part of the heat source side heat exchanger 23 and the suction side of the compression mechanism 21.
- the first oil return circuit 101 mainly includes an oil return pipe 101a that connects the lower part of the heat source side heat exchanger 23 and the suction side of the compression mechanism 21, an on-off valve 101b connected to the oil return pipe 101a, and a check.
- the oil return pipe 101a is provided at one end so that the refrigeration oil can be extracted together with the refrigerant from the lower part of the heat source side heat exchanger 23.
- This is a pipe that extends to the inside of the flow path 23b through which the refrigerant of the heat source side heat exchanger 23 flows through the inside of the pipe of the liquid side nozzle 23e provided in the lower part of the cross.
- each plate member 23a in order to communicate between the plurality of flow paths 23b, each plate member 23a is provided with a communication hole 23h (the same applies to the plurality of flow paths 23c).
- the oil return pipe 101a may be provided so as to penetrate the plurality of flow paths 23b (see the oil return pipe 101a indicated by the broken line in FIG. 3). It should be noted that the oil return pipe 101a has one end provided so that the lower force of the heat source side heat exchange can also extract the refrigerating machine oil together with the refrigerant. Therefore, the liquid side nozzle 23e for the heat source side heat exchange and the heat source may be used. A pipe connecting the side heat exchange and the heat source side expansion valve 24 may be provided. Further, the other end of the oil return pipe 101a is connected to the suction side of the compression mechanism 21 in the present embodiment.
- the on-off valve 101b is connected so that the first oil return circuit 101 can be used as necessary, and is an electromagnetic valve capable of circulating and blocking refrigerant and refrigerating machine oil.
- the check valve 101c is a valve that allows refrigerant and refrigeration oil only to flow in the oil return pipe 101a toward the suction side of the compressor mechanism 21 as well as the lower force of the heat source side heat exchanger 23.
- the capillary tube 101d is a thin tube that depressurizes the refrigerant and refrigerating machine oil extracted from the lower part of the heat source side heat exchange to the refrigerant pressure on the suction side of the compression mechanism 21.
- the first bypass circuit 102 is configured to switch the refrigerating machine oil accumulated in the heat source side heat exchanger 23 when the evaporation operation is switched, i.e., when the heat source side heat exchanger 23 functions as an evaporator.
- 21 is a circuit used in an oil recovery operation (described later) for returning to the suction side of 21, and is provided so that the refrigerant discharged from the compression mechanism 21 can be binned to the suction side of the compression mechanism 21.
- the first bypass circuit 102 mainly includes a bypass pipe 102a connecting the discharge side from the compression mechanism 21 to the suction side of the compression mechanism 21, and an on-off valve 102b connected to the bypass pipe 102a. In the present embodiment, as shown in FIG.
- the bypass pipe 102a has one end connected to an oil return pipe 21e through which the refrigeration oil separated in the oil separator 21b flows, and the other end connected to the compression mechanism 21.
- a bypass tube 21f provided in an oil return pipe 21e through which the refrigerating machine oil separated in the oil separator 21b flows is provided so as to be bypassed.
- the bypass pipe 102a only needs to be provided so that the refrigerant discharged from the compression mechanism 21 can be bypassed to the suction side of the compression mechanism 21.
- the bypass pipe 102a is provided upstream or downstream of the oil separator 21b.
- the side position force may also be provided so that the refrigerant can flow to the suction side of the compression mechanism 21.
- the on-off valve 102b is connected so that the first bypass circuit 102 can be used as necessary, and is an electromagnetic valve capable of circulating and blocking refrigerant and refrigerating machine oil.
- the pressurizing circuit 111 condenses the high-pressure gas refrigerant compressed in the compression mechanism 21 in the heat source side heat exchange 23 when the condensation operation is switched, that is, when the heat source side heat exchanger 23 functions as a condenser. In this circuit, after the pressure is reduced in the heat source side expansion valve 24, the refrigerant is sent to the use side refrigerant circuits 12a, 12b, 12c.
- the pressurizing circuit 111 mainly includes a pressurizing pipe 111a that connects the discharge side of the compression mechanism 21 and the downstream side of the heat source side expansion valve 24 (that is, between the heat source side expansion valve 24 and the liquid side closing valve 27).
- the on-off valve 111b connected to the pressurizing pipe 111a, the check valve 111c, and the capillary tube 11 Id are provided.
- one end of the pressurizing pipe 111a is connected between the outlet of the oil separator 21b of the compression mechanism 21 and the first ports 22a and 26a of the first and second cut-off structures 22 and 26. Yes.
- the other end of the pressurizing pipe 111a is connected between the heat source side expansion valve 24 and the receiver 25 in the present embodiment.
- the on-off valve 111b is provided with a pressurizing circuit 111 as necessary. It is a solenoid valve that is connected to enable use and that allows the refrigerant to flow and shut off.
- the check valve 1 l ie is a valve that only allows the refrigerant to flow through the pressurizing pipe 11 la by directing the discharge side force of the compression mechanism 21 toward the downstream side of the heat source side expansion valve 24.
- the cylinder tube ll ld is a thin tube that depressurizes the refrigerant from which the discharge side force of the compression mechanism 21 has been extracted to the refrigerant pressure on the downstream side of the heat source side expansion valve 24.
- the cooler 121 In the condenser operation switching state, that is, when the heat source side heat exchange 23 functions as a condenser, the cooler 121 is condensed in the heat source side heat exchange 23 and then depressurized in the heat source side expansion valve 24. This is heat exchange for cooling the refrigerant sent to the use-side refrigerant circuits 12a, 12b, and 12c.
- the cooler 121 is connected between the receiver 25 and the liquid side closing valve 27 in the present embodiment.
- the pressurizing pipe 111a is connected between the heat source side expansion valve 24 and the cooler 121 so that the high-pressure gas refrigerant merges with the refrigerant depressurized in the heat source side expansion valve 24. It is connected to the.
- the cooler 121 for example, a double-pipe heat exchange can be used.
- the cooling circuit 122 switches a part of the refrigerant sent from the heat source side heat exchange to the use side refrigerant circuits 12a, 12b, and 12c when the condensation operation is switched, that is, when the heat source side heat exchange 23 functions as a condenser. It is branched from the heat source side refrigerant circuit 12d, introduced into the cooler 121, condensed in the heat source side heat exchanger 23, depressurized in the heat source side expansion valve 24, and then into the use side refrigerant circuits 12a, 12b, 12c. This is a circuit connected to the heat source side refrigerant circuit 12d so that the refrigerant to be sent is cooled and then returned to the suction side of the compression mechanism 21.
- the cooling circuit 122 mainly includes an introduction pipe 122a for introducing a part of the refrigerant sent from the heat source side heat exchanger 23 to the use side refrigerant circuits 12a, 12b, and 12c into the cooler 121, and a cooling connected to the introduction pipe 122a.
- the circuit side expansion valve 122b and the outlet pipe 122c for returning the refrigerant that has passed through the cooler 121 to the suction side of the compression mechanism 21 are provided.
- one end of the introduction pipe 122a is connected between the receiver 25 and the cooler 121. Further, the other end of the introduction pipe 122a is connected to an inlet of the cooler 121 on the cooling circuit 122 side in the present embodiment.
- the cooling circuit side expansion valve 122b is connected so that the cooling circuit 122 can be used as necessary, and an electric expansion capable of adjusting the flow rate of the refrigerant flowing through the cooling circuit 122. It is a tension valve.
- the outlet pipe 122c is a cooling circuit having one end at the cooler 121. It is connected to the exit on the 122 side. In the present embodiment, the other end of the outlet pipe 122c is connected to the suction side of the compression mechanism 21.
- the heat source unit 2 is provided with various sensors. Specifically, the heat source unit 2 includes a suction pressure sensor 93 that detects a suction pressure of the compression mechanism 21, a discharge pressure sensor 94 that detects a discharge pressure of the compression mechanism 21, and a discharge side of the compression mechanism 21. A discharge temperature sensor 95 for detecting the discharge temperature of the refrigerant and a cooling circuit outlet temperature sensor 96 for detecting the temperature of the refrigerant flowing through the outlet pipe 122c of the cooling circuit 122 are provided. Further, the heat source unit 2 includes a heat source side control unit 97 that controls the operation of each part constituting the heat source unit 2. The heat source side control unit 97 has a microcomputer memory provided for controlling the heat source unit 2, and uses side control units 36, 46, 46 of the usage units 3, 4, 5. Control signal etc. can be exchanged with 56! /.
- Connection units 6, 7, and 8 are installed indoors, such as in buildings, along with usage units 3, 4, and 5.
- the connection units 6, 7, 8 are interposed between the use units 3, 4, 5 and the heat source unit 2 together with the refrigerant communication pipes 9, 10, 11, and constitute a part of the refrigerant circuit 12,
- the connection units 6, 7, 8 are interposed between the use units 3, 4, 5 and the heat source unit 2 together with the refrigerant communication pipes 9, 10, 11, and constitute a part of the refrigerant circuit 12, The
- connection unit 6 and the connection units 7 and 8 have the same configuration, only the configuration of the connection unit 6 will be described here, and the configuration of the connection units 7 and 8 will be described respectively.
- Symbols in the 70's or 80's are attached instead of the symbols in the 60's indicating each part of 6 and the explanation of each part is omitted.
- the connection unit 6 mainly constitutes a part of the refrigerant circuit 12, and includes a connection side refrigerant circuit 12e (in the connection units 7 and 8, connection side refrigerant circuits 12f and 12g, respectively).
- the connection-side refrigerant circuit 12e mainly includes a liquid connection pipe 61, a gas connection pipe 62, a high pressure gas on / off valve 66, and a low pressure gas on / off valve 67.
- the liquid connection pipe 61 connects the liquid refrigerant communication pipe 9 and the use side expansion valve 31 of the use side refrigerant circuit 12a.
- the gas connection pipe 62 includes a high pressure gas connection pipe 63 connected to the high pressure gas refrigerant communication pipe 10, a low pressure gas connection pipe 64 connected to the low pressure gas refrigerant communication pipe 11, and a high pressure gas connection pipe 63. It has a confluence gas connection pipe 65 that joins the pipe 64 and has one stroke.
- the combined gas connection pipe 65 is connected to the gas side of the use side heat exchange of the use side refrigerant circuit 12a.
- the high-pressure gas on-off valve 66 is connected to the high-pressure gas connection pipe 63 and is an electromagnetic valve capable of circulating and blocking the refrigerant.
- the low-pressure gas on-off valve 67 is connected to the low-pressure gas connection pipe 64 and is an electromagnetic valve capable of circulating and blocking the refrigerant.
- the connection unit 6 closed the high pressure gas on / off valve 66 and opened the low pressure gas on / off valve 67 when the use unit 3 performs the cooling operation (hereinafter referred to as the cooling operation switching state).
- the connection unit 6 is in a state where the low pressure gas on / off valve 67 is closed and the high pressure gas on / off valve 66 is opened when the use unit 3 performs the heating operation (hereinafter referred to as the heating operation switching state).
- connection unit 6 includes a connection-side control unit 68 that controls the operation of each unit constituting the connection unit 6.
- the connection side control unit 68 includes a microcomputer and a memory provided for controlling the connection unit 6, and exchanges control signals and the like with the use side control unit 36 of the use unit 3. You will be able to do it.
- the use side refrigerant circuits 12a, 12b, and 12c, the heat source side refrigerant circuit 12d, the refrigerant communication pipes 9, 10, and 11 and the connection side refrigerant circuits 12e, 12f, and 12g are connected, and the air
- the refrigerant circuit 12 of the harmony device 1 is configured. That is, the refrigerant circuit 12 includes a compression mechanism 21, a heat source side heat exchanger 23 configured such that when the refrigerant functions as a refrigerant evaporator, the refrigerant flows in the lower force and flows out the upper force, and the use side heat.
- the liquid refrigerant pipe including the liquid refrigerant communication pipe 9 connecting the exchangers 32, 42, 52, the heat source side heat exchanger 23 and the use side heat exchangers 32, 42, 52, and the heat source side provided in the liquid refrigerant pipe
- the condensation operation switching state that causes the expansion valve 24 and the heat source side heat exchanger 23 to function as a condenser for refrigerant discharged from the compression mechanism 21 and the heat source side heat exchanger 23 to function as an evaporator for refrigerant flowing through the liquid refrigerant pipe Switching between evaporation operation switching states
- the first structure 22 as the heat source side structure to be enabled, and the refrigerant discharged from the compression mechanism 21 connected between the discharge side of the compression mechanism 21 and the first structure 22 is the first structure 22.
- High-pressure gas refrigerant pipe that includes a high-pressure gas refrigerant communication pipe 10 that can branch before flowing into the air, and cooling that causes the use side heat exchangers 32, 42, and 52 to function as an evaporator for the refrigerant flowing through the liquid refrigerant pipe Connection unit 6, 7 as a use-side switching mechanism that enables switching between the operation switching state and the heating operation switching state in which the use-side heat exchangers 32, 42, 52 function as a refrigerant condenser flowing in the high-pressure gas refrigerant pipe.
- the first oil return circuit 101 and the first bypass are operated when the heat source side heat exchanger 23 is operated to function as an evaporator.
- the heat source side heat exchanger 23 Is controlled by the heat source side expansion valve 24, and a wide range of evaporation capacity can be controlled by a single heat source side heat exchanger 23.
- the pressure circuit 111 and the cooler 121 are used to condense the heat source side heat exchanger 23.
- a plurality of units are provided as compared with the conventional air conditioner, and the heat exchange on the heat source side is unified! Speak.
- the operation mode of the air conditioner 1 of the present embodiment includes a heating operation mode in which all the usage units 3, 4, and 5 are heated according to the air conditioning load of each usage unit 3, 4, and 5, and a usage unit 3 , 4 and 5 can be divided into a cooling operation mode in which the cooling operation is performed and a cooling and heating simultaneous operation mode in which some of the usage units 3, 4, and 5 perform the cooling operation while the other usage units perform the heating operation. it can.
- the heat source side heat exchange 23 of the heat source unit 2 is functioning as an evaporator due to the air conditioning load of the usage units 3, 4, and 5 (evaporation operation switching state).
- the heat source side heat exchanger 23 of the heat source unit 2 as a condenser! / You can divide the operation mode into the case where you are talking (condensing operation switching state).
- the refrigerant circuit 12 of the air conditioner 1 is configured as shown in FIG. 4 (the refrigerant flow is attached to the refrigerant circuit 12 of FIG. 4). (See the arrow marked.)
- the first switching mechanism 22 is switched to the evaporation operation switching state (the state indicated by the broken line of the first switching mechanism 22 in FIG. 4).
- the cut structure 26 By switching the cut structure 26 to the heating load required operation state (the state indicated by the broken line of the second cut structure 26 in FIG.
- the heat exchange 23 on the heat source side functions as an evaporator and the high pressure gas refrigerant
- the high-pressure gas refrigerant compressed and discharged by the compression mechanism 21 can be supplied to the use units 3, 4, and 5 through the communication pipe 10!
- the opening degree of the heat source side expansion valve 24 is adjusted so as to depressurize the refrigerant.
- the on-off valve 111b of the pressurizing circuit 111 and the cooling circuit side expansion valve 122b of the cooling circuit 122 are closed, and a high-pressure gas refrigerant is combined with the refrigerant flowing between the heat source side expansion valve 24 and the receiver 25.
- connection units 6, 7, and 8 the low-pressure gas on-off valves 67, 77, and 87 are closed and the high-pressure gas on-off valves 66, 76, and 86 are opened, thereby ⁇ 32, 42, 52 is in a state of functioning as a condenser (ie, heating operation switching state).
- the usage-side expansion valves 31, 41, and 51 are, for example, connected to the usage-side heat exchangers 32, 42, and 52.
- Opening degree based on the degree of supercooling (specifically, the temperature difference between the refrigerant temperature detected by the liquid side temperature sensors 33, 43, 53 and the refrigerant temperature detected by the gas side temperature sensors 34, 44, 54)
- the opening degree is adjusted according to the heating load of each usage unit.
- the high-pressure gas refrigerant compressed and discharged by the compressor 21a of the compression mechanism 21 is supplied from the refrigerating machine oil accompanying the high-pressure gas refrigerant in the oil separator 21b. Most of them are separated and sent to the second structure 26.
- the refrigerating machine oil separated in the oil separator 21b is returned to the suction side of the compressor 21a through the second oil return circuit 21d.
- the high-pressure gas refrigerant sent to the second structure 26 is sent to the high-pressure gas refrigerant communication pipe 10 through the first port 26a and the fourth port 26d of the second structure 26 and the high-pressure gas side closing valve 28.
- the high-pressure gas refrigerant sent to the high-pressure gas refrigerant communication pipe 10 is branched into three and sent to the high-pressure gas connection pipes 63, 73, 83 of the connection units 6, 7, 8.
- the high-pressure gas refrigerant sent to the high-pressure gas connection pipes 63, 73, 83 of the connection units 6, 7, 8 passes through the high-pressure gas on / off valves 66, 76, 86 and the merging gas connection pipes 65, 75, 85.
- Units 3, 4, and 5 are sent to the IJ side heat exchanger ⁇ 32, 42, 52.
- the high-pressure gas refrigerant sent to the use side heat exchangers 32, 42, 52 is heated with indoor air in the use side heat exchange ⁇ 32, 42, 52 of the use units 3, 4, 5 It is condensed by exchanging. On the other hand, indoor air is heated and supplied indoors.
- the refrigerant condensed in the use side heat exchangers 32, 42, 52 passes through the use side expansion valves 31, 41, 51 and then is sent to the liquid connection pipes 61, 71, 81 of the connection units 6, 7, 8 .
- the refrigerant sent to the liquid connection pipes 61, 71, 81 is sent to the liquid refrigerant communication pipe 9 to join.
- the refrigerant sent to the liquid refrigerant communication pipe 9 and joined together is sent to the receiver 25 through the liquid side closing valve 27 and the cooler 121 of the heat source unit 2.
- the refrigerant sent to the receiver 25 is temporarily stored in the receiver 25 and then decompressed by the heat source side expansion valve 24.
- the refrigerant decompressed by the heat source side expansion valve 24 is evaporated by exchanging heat with water as a heat source in the heat source side heat exchanger 23 to become a low-pressure gas refrigerant.
- the low-pressure gas refrigerant sent to the first structure 22 is
- the first switching mechanism 22 is returned to the suction side of the compression mechanism 21 through the second port 22b and the third port 22c. In this way, the operation in the heating operation mode is performed.
- the heating load of each of the utilization units 3, 4, and 5 may be very small.
- the refrigerant evaporation capacity in the heat source side heat exchange 23 of the heat source unit 2 is reduced, and the heating load of the entire usage units 3, 4, 5 (that is, the usage side heat exchangers 32, 42, Must be balanced with a condensing load of 52).
- control is performed to reduce the evaporation amount of the refrigerant in the heat source side heat exchange by controlling the opening degree of the heat source side expansion valve 24 to be small.
- the control for reducing the opening degree of the heat source side expansion valve 24 is performed, the liquid level of the refrigerant in the heat source side heat exchanger is lowered.
- the heat exchange is configured such that the refrigerant flows in both the lower force and the upper force (see FIGS. 2 and 2). 3)), the refrigeration oil becomes difficult to be discharged together with the evaporated refrigerant, and the refrigeration oil is likely to accumulate.
- the first oil return circuit 101 and the first bypass circuit 102 are provided. Then, in this air conditioner 1, when the first cut-off structure 22 is operated in the evaporation operation switching state, as shown in FIG. 5, the first on-off valve 102b is temporarily opened to open the first (1) The refrigerant discharged from the compression mechanism 21 via the bypass circuit 102 is bypassed to the suction side of the compression mechanism 21, and the first notch 22 is switched to the condensation operation switching state (indicated by the solid line of the first switching mechanism 22 in FIG. 5).
- the heat source side expansion valve 24 is closed and the on-off valve 101b is opened to perform the oil recovery operation, and then the on-off valve 101b is closed and the heat source-side expansion valve 24 is opened and opened.
- By closing the valve 102b it is possible to return to the operating state before the oil collecting operation shown in FIG.
- the first It is sent to the suction side of the compression mechanism 21 through the bypass circuit 102.
- the on-off valve 101b of the first oil return circuit 101 is opened, the high-pressure gas refrigerant passes through the first mechanism 22 and the upper force of the heat source side heat exchange is also increased.
- the refrigerant flows in and flows downward, and the refrigerating machine oil accumulated in the heat source side heat exchange is pushed to the suction side of the compression mechanism 21 through the first oil return circuit 101 (see FIG. 5).
- the on-off valve 101b is closed, the first switching mechanism 22 is switched to the evaporation operation switching state, the heat source side expansion valve 24 is opened, and the on-off valve 102b is closed to recover the oil.
- the refrigerant discharged from the compression mechanism 21 via the first bypass circuit 102 is bypassed to the suction side of the compression mechanism 21 to ensure the suction pressure of the compression mechanism 21.
- the refrigerating machine oil returned to the suction side of the compression mechanism 21 through the first oil return circuit 101 is mixed with the high-pressure gas refrigerant that is binarized through the first bypass circuit 102, whereby the liquid in the compression mechanism 21 is mixed. This is to prevent compression.
- the order of opening and closing operations of the on-off valves 101b and 102b, the heat source side expansion valve 24 and the first switching mechanism 22 is not limited to the above, but the high-pressure gas refrigerant discharged from the compression mechanism 21 is not limited to the above.
- the operation to open the on-off valve 102b is given priority over other operations, and when returning to the operating state before the oil recovery operation, the on-off valve 102b It is desirable to perform the operation of closing after performing other operations.
- the high pressure gas switching of the connection units 6, 7, and 8 as the use side mechanism is performed despite the fact that the first switching mechanism 22 is temporarily switched to the condensing operation switching state. It is not necessary to change the flow direction of the refrigerant in the entire refrigerant circuit 12 by operating the valves 66, 76, 86 and the low-pressure gas on-off valves 67, 77, 87 to be in the cooling operation switching state. It becomes possible to quickly start up after returning to the operating state before the oil recovery operation after the recovery operation, and the rushing force that impairs the comfort of the room is also stored in the heat source side heat exchanger 23 in a short time. Refrigerating machine oil can be recovered.
- Such oil recovery operation is performed with the first switching mechanism 22 in the evaporation operation switching state.
- the first switching mechanism 22 is operated in the evaporative operation switching state in order to reduce the frequency of oil recovery operation.
- the liquid level of the cooling medium in the heat source side heat exchange is lowered, and the refrigerant is not easily discharged together with the evaporated refrigerant. It may be performed periodically only when it is.
- the heat source side expansion valve 24 is not more than a predetermined opening.
- This predetermined opening degree is the opening degree of the heat source side expansion valve 24 in which the refrigerant level in the heat source side heat exchanger 23 is lowered, and the refrigerant oil is not easily discharged together with the evaporated refrigerant. It is found experimentally and is determined based on the opening found experimentally.
- the refrigerant circuit 12 of the air conditioner 1 is configured as shown in FIG. 6 (the refrigerant flow is attached to the refrigerant circuit 12 of FIG. 6). (See the arrow marked.)
- the heat source side refrigerant circuit 12d of the heat source unit 2 by switching the first switching mechanism 22 to the condensing operation switching state (the state indicated by the solid line of the first switching mechanism 22 in FIG. 6), Heat source side heat exchange functions as a condenser.
- the heat source side expansion valve 24 is in an opened state.
- the on-off valve 101b of the first oil return circuit 101 and the on-off valve 102b of the first bypass circuit 102 are closed so that the oil recovery operation using these circuits is not performed.
- the high-pressure gas on-off valves 66, 76, and 86 are closed and the low-pressure gas on-off valves 67, 77, and 87 are opened, so that the use side heat exchangers of the use units 3, 4, and 5 32, 42 and 52 function as evaporators, and the use side heat exchange 32, 42 and 52 of the use units 3, 4 and 5 and the suction side of the compression mechanism 21 of the heat source unit 2 are connected to the low pressure gas refrigerant communication pipe 11 It is in a state of being connected via (ie, cooling operation switching state).
- the usage side expansion valves 31, 41, and 51 are, for example, the degree of superheat of the usage side heat exchangers 32, 42, and 52 (specifically, the liquid side temperature sensors 33, 43). The opening degree is adjusted based on the temperature difference between the refrigerant temperature detected at 53 and the refrigerant temperature detected at gas side temperature sensors 34, 44, 54). The degree is adjusted. [0047] In such a configuration of the refrigerant circuit 12, the high-pressure gas refrigerant compressed and discharged by the compressor 21a of the compression mechanism 21 is supplied from the refrigerating machine oil accompanying the high-pressure gas refrigerant in the oil separator 21b. Most of them are separated and sent to the first switching mechanism 22.
- the refrigerating machine oil separated in the oil separator 21b is returned to the suction side of the compressor 21a through the second oil return circuit 21d.
- the high-pressure gas refrigerant sent to the first switching mechanism 22 is sent to the heat source side heat exchanger 23 through the first port 22a and the second port 22b of the first switching mechanism 22.
- the high-pressure gas refrigerant sent to the heat source side heat exchanger 23 is condensed by exchanging heat with water as the heat source in the heat source side heat exchanger 23.
- the refrigerant condensed in the heat source side heat exchange 23 passes through the heat source side expansion valve 24, and then the high pressure gas refrigerant compressed and discharged by the compression mechanism 21 through the pressurizing circuit 111 joins (details will be described later).
- Sent to Resino 25 The refrigerant sent to the receiver 25 is temporarily stored in the receiver 25 and then sent to the cooler 121. Then, the refrigerant sent to the cooler 121 is cooled by exchanging heat with the refrigerant flowing through the cooling circuit 122 (details will be described later). Then, the refrigerant cooled in the cooler 121 is sent to the liquid refrigerant communication pipe 9 through the liquid side closing valve 27.
- the refrigerant sent to the liquid refrigerant communication pipe 9 is branched into three and sent to the liquid connection pipes 61, 71, 81 of the connection units 6, 7, 8 respectively. Then, the refrigerant sent to the liquid connection pipes 61, 71, 81 of the connection units 6, 7, 8 is sent to the use side expansion valves 31, 41, 51 of the use units 3, 4, 5.
- the refrigerant sent to the use side expansion valves 31, 41, 51 is depressurized by the use side expansion valves 31, 41, 51, and then exchanges heat with indoor air in the use side heat exchangers 32, 42, 52. Is evaporated into a low-pressure gas refrigerant. On the other hand, indoor air is cooled and supplied indoors. Then, the low-pressure gas refrigerant is sent to the merged gas connection pipes 65, 75, 85 of the connection units 6, 7, 8.
- the low-pressure gas refrigerant sent to the merged gas connection pipes 65, 75, 85 passes through the low-pressure gas on / off valves 67, 77, 87 and the low-pressure gas connection pipes 64, 74, 84 to the low-pressure gas refrigerant communication pipe 11. Sent to join.
- each utilization unit 3, 4, and 5 may become very small.
- the refrigerant condensing capacity in the heat source side heat exchange 23 of the heat source unit 2 is reduced, and the cooling load (that is, the use side heat exchangers 32, 42, Must be balanced with an evaporation load of 52). Therefore, control is performed to reduce the amount of refrigerant condensed in the heat source side heat exchanger 23 by performing control to reduce the opening degree of the heat source side expansion valve 24.
- the opening of the heat source side expansion valve 24 By controlling the opening of the heat source side expansion valve 24 in this way, the amount of liquid refrigerant that accumulates in the heat source side heat exchanger increases! ] By reducing the effective heat transfer area, the condensation capacity is reduced.
- the high-pressure gas refrigerant compressed and discharged by the compression mechanism 21 is decompressed by the heat source side expansion valve 24, and is supplied to the use side refrigerant circuits 12a, 12b, and 12c.
- a pressurizing circuit 111 for joining the refrigerant to be sent is provided.
- the on-off valve 111b of the pressurizing circuit 111 is opened when in the cooling operation mode (that is, when the first switching mechanism 22 is in the condensing operation switching state), and is compressed through the pressurizing pipe 111a.
- the discharge side force of 21 can also be merged downstream of the heat source side expansion valve 24.
- the high pressure gas refrigerant is joined to the downstream side of the heat source side expansion valve 24 through the pressurization circuit 111 to thereby obtain the heat source side expansion valve 24.
- the refrigerant pressure on the downstream side can be increased.
- the high-pressure gas refrigerant is joined and sent to the use-side refrigerant circuits 12a, 12b, and 12c.
- the refrigerant to be used becomes a gas-liquid two-phase flow with a large gas fraction
- the refrigerant is branched from the liquid refrigerant communication pipe 9 to each usage side refrigerant circuit 12a, 12b, 12c, the usage side refrigerant circuit 12a
- a drift occurs between 12b and 12c.
- the cooler 121 is further provided on the downstream side of the heat source side expansion valve 24. For this reason, while controlling the opening degree of the heat source side expansion valve 24 to be small, the high pressure gas refrigerant is joined to the downstream side of the heat source side expansion valve 24 through the pressurization circuit 111 to thereby control the heat source side expansion valve 24.
- the refrigerant that is depressurized by the heat source side expansion valve 24 and sent to the use side refrigerant circuits 12a, 12b, 12c is cooled by the cooler 121.
- the gas refrigerant can be condensed, and it is not necessary to send a gas-liquid two-phase flow refrigerant having a large gas fraction to the use-side refrigerant circuits 12a, 12b, and 12c.
- the pressurizing pipe 111a is connected between the heat source side expansion valve 24 and the receiver 25, so that the refrigerant on the downstream side of the heat source side expansion valve 24 has a high pressure.
- the gas refrigerant is joined, and the high-temperature gas refrigerant is joined to cool the refrigerant whose temperature is high by the cooler 121.
- a relatively high temperature cold heat source that does not require the use of a low temperature cold heat source can be used as the cold heat source for cooling the refrigerant in the cooler 121.
- the cooling circuit 122 is provided, and a part of the refrigerant sent from the heat source side heat exchanger 23 to the use side refrigerant circuits 12a, 12b, 12c. Is reduced to a refrigerant pressure that can be returned to the suction side of the compression mechanism 21, and this refrigerant is used as a cooling source for the cooler 121.
- the refrigerant is reduced in pressure at the heat source side expansion valve 24 and used on the refrigerant circuits 12a, 12b.
- a cooling source having a temperature sufficiently lower than the temperature of the refrigerant sent to 12c can be obtained.
- the cooling circuit side expansion valve 122b of the cooling circuit 122 calculates, for example, the degree of superheat of the cooler 121 (based on the cooling medium temperature detected by the cooling circuit outlet temperature sensor 96 provided in the outlet pipe 122c of the cooling circuit 122). The degree of opening is adjusted according to the flow rate and temperature of the refrigerant sent from the downstream side of the heat source side expansion valve 24 to the use side refrigerant circuits 12a, 12b, 12c.
- the usage unit 3 is in a cooling operation and the usage units 4 and 5 are in a heating / cooling simultaneous operation mode.
- the refrigerant circuit 12 of the air conditioner 1 is configured as shown in FIG. 7 (refer to the arrows attached to the refrigerant circuit 12 of FIG. 7 for the refrigerant flow).
- the first switching mechanism 22 is switched to the evaporative operation switching state (indicated by the broken line of the first switching mechanism 22 in FIG.
- the second switching mechanism 26 is switched to the heating load required operation state (the state indicated by the broken line of the second mechanism 26 in Fig. 7), thereby evaporating the heat source side heat exchange 23.
- the high-pressure gas refrigerant compressed and discharged by the compression mechanism 21 can be supplied to the utilization units 4 and 5 through the high-pressure gas refrigerant communication pipe 10. Further, the opening degree of the heat source side expansion valve 24 is adjusted so as to depressurize the refrigerant.
- the on-off valve 111b of the pressurizing circuit 111 and the cooling circuit side expansion valve 122b of the cooling circuit 122 are closed, and a high-pressure gas refrigerant is used as the refrigerant flowing between the heat source side expansion valve 24 and the receiver 25.
- the refrigerant flowing between the receiver 25 and the utilization units 3, 4, and 5 is not cooled by merging or shutting off the supply of the cold heat source to the cooler 121.
- the connection unit 6 by closing the high pressure gas on / off valve 66 and opening the low pressure gas on / off valve 67, the use side heat exchange of the usage unit 3 functions as an evaporator and the usage side heat of the usage unit 3 is used.
- the usage-side expansion valve 31 is, for example, the degree of superheat of the usage-side heat exchanger 32 (specifically, the refrigerant temperature detected by the liquid-side temperature sensor 33 and the gas-side temperature sensor 34).
- the degree of opening is adjusted in accordance with the cooling load of the utilization unit, for example, the degree of opening is adjusted based on the temperature difference from the refrigerant temperature.
- connection units 7 and 8 the low-pressure gas on-off valves 77 and 87 are closed and the high-pressure gas on-off valves 76 and 86 are opened, so that the use side heat exchangers 42 and 52 of the use units 4 and 5 are condensed. It is in a state to function as (that is, a heating operation switching state).
- the usage side expansion valves 41 and 51 are detected by, for example, the degree of supercooling of the usage side heat exchangers 42 and 52 (specifically, detected by the liquid side temperature sensors 43 and 53).
- the degree of opening is adjusted based on the temperature difference between the refrigerant temperature and the refrigerant temperature detected by the gas-side temperature sensors 44 and 54). The opening is adjusted according to the heating load of the unit.
- the high-pressure gas refrigerant compressed and discharged by the compressor 21a of the compression mechanism 21 is supplied to the high-pressure gas refrigerant in the oil separator 21b. Most of them are separated and sent to the second structure 26.
- the refrigerating machine oil separated in the oil separator 21b is returned to the suction side of the compressor 21a through the second oil return circuit 21d.
- the high-pressure gas refrigerant sent to the second structure 26 is sent to the high-pressure gas refrigerant communication pipe 10 through the first port 26a and the fourth port 26d of the second structure 26 and the high-pressure gas side closing valve 28. It is done.
- the high-pressure gas refrigerant sent to the high-pressure gas refrigerant communication pipe 10 is branched into two and sent to the high-pressure gas connection pipes 73 and 83 of the connection units 7 and 8.
- the high-pressure gas refrigerant sent to the high-pressure gas connection pipes 73 and 83 of the connection units 7 and 8 passes through the high-pressure gas on / off valves 76 and 86 and the confluence gas connection pipes 75 and 85, and the usage-side heat of the use units 4 and 5 Sent to exchangers 42 and 52.
- the high-pressure gas refrigerant sent to the use side heat exchangers 42 and 52 is condensed by exchanging heat with indoor air in the use side heat exchangers 42 and 52 of the use units 4 and 5. It is done. On the other hand, indoor air is heated and supplied indoors.
- the refrigerant condensed in the use side heat exchangers 42 and 52 passes through the use side expansion valves 41 and 51 and then is sent to the liquid connection pipes 71 and 81 of the connection units 7 and 8.
- the refrigerant sent to the liquid connection pipes 71 and 81 is sent to the liquid refrigerant communication pipe 9 to be joined.
- a part of the refrigerant sent to and joined to the liquid refrigerant communication pipe 9 is sent to the liquid connection pipe 61 of the connection unit 6. Then, the refrigerant sent to the liquid connection pipe 61 of the connection unit 6 is sent to the use side expansion valve 31 of the use unit 3.
- the refrigerant sent to the use-side expansion valve 31 is decompressed by the use-side expansion valve 31, and then evaporated by exchanging heat with indoor air in the use-side heat exchanger 32. It becomes a gas refrigerant. On the other hand, indoor air is cooled and supplied indoors. Then, the low-pressure gas refrigerant is sent to the merged gas connection pipe 65 of the connection unit 6.
- the low-pressure gas refrigerant sent to the merged gas connection pipe 65 is supplied with a low-pressure gas on-off valve 67 and It is sent to the low-pressure gas refrigerant communication pipe 11 through the low-pressure gas connection pipe 64 and merges.
- the low-pressure gas refrigerant sent to the low-pressure gas refrigerant communication pipe 11 is returned to the suction side of the compression mechanism 21 through the low-pressure gas side closing valve 29.
- the remaining refrigerant excluding the refrigerant sent from the liquid refrigerant communication pipe 9 to the connection unit 6 and the use unit 3 is sent to the resin 25 through the liquid side shut-off valve 27 and the cooler 121 of the heat source unit 2.
- the refrigerant sent to the receiver 25 is temporarily stored in the receiver 25 and then decompressed by the heat source side expansion valve 24.
- the refrigerant depressurized by the heat source side expansion valve 24 is evaporated by exchanging heat with water as a heat source in the heat source side heat exchange 23 to become a low pressure gas refrigerant. Sent.
- the low-pressure gas refrigerant sent to the first structure 22 is returned to the suction side of the compression mechanism 21 through the second port 22b and the third port 22c of the first structure 22. In this way, the operation in the cooling and heating simultaneous operation mode (evaporation load) is performed.
- the heat source side heat exchanger 23 requires an evaporation load, but its size may be very small.
- the refrigerant evaporation capacity in the heat source side heat exchanger 23 of the heat source unit 2 is reduced, and the air conditioning load and balance of the entire usage units 3, 4, and 5 are reduced. I have to let it.
- the cooling load of the utilization unit 3 and the heating load of the utilization units 4 and 5 may be approximately the same load. Since the evaporation load of the heat source side heat exchanger 23 must be very small, the refrigerating machine oil is likely to accumulate in the heat source side heat exchanger 23 as compared with the heating operation mode described above.
- the first shelf structure 22 is provided in the same manner as in the heating operation mode described above.
- the refrigerant discharged from the compression mechanism 21 via the first bypass circuit 102 is temporarily opened by temporarily opening the opening / closing valve 102b.
- the oil recovery operation is performed by opening the on-off valve 101b, and then the on-off valve 101b Is closed, the heat source side expansion valve 24 is opened, and the on-off valve 102b is closed so that the operation state before the oil recovery operation shown in FIG. 7 can be restored.
- the on-off valve 101b is closed, the first switching mechanism 22 is switched to the evaporation operation switching state, the heat source side expansion valve 24 is opened, and the on-off valve 102b is closed.
- the operating state before the recovery operation is restored (see Fig. 7).
- the refrigerant discharged from the compression mechanism 21 via the first bypass circuit 102 is bypassed to the suction side of the compression mechanism 21 because the suction pressure of the compression mechanism 21 is reduced.
- the refrigerating machine oil returned to the suction side of the compression mechanism 21 through the first oil return circuit 101 is mixed with the high-pressure gas refrigerant that is bypassed through the first bypass circuit 102, thereby compressing the liquid in the compression mechanism 21. This is to prevent it.
- the order of opening and closing operations of the on-off valves 101b and 102b, the heat source side expansion valve 24, and the first switching mechanism 22 is not limited to the above, but the high-pressure gas refrigerant discharged from the compression mechanism 21 is not limited to the above. From the viewpoint of securing the flow path, when performing oil recovery operation, the operation to open the on-off valve 102b is given priority over other operations, and when returning to the operating state before the oil recovery operation, the valve is opened and closed. It is desirable to perform the operation of closing 102b after performing another operation.
- the first switching mechanism 22 is temporarily condensed. Regardless of switching to the switching state, all the high pressure gas on / off valves 66, 76, 86 and low pressure gas on / off valves 67, 77, 87 of the connection units 6, 7, 8 as usage side switching are in the cooling operation switching state. It is not necessary to change the direction of the refrigerant flow in the entire refrigerant circuit 12 so that the start-up can be performed quickly when returning to the operating state before the oil recovery operation after the oil recovery operation. Thus, the refrigeration oil accumulated in the heat source side heat exchanger 23 can be recovered in a short time without impairing the comfort of the room.
- Such oil recovery operation may be performed periodically when the first switching mechanism 22 is operating in the evaporation operation switching state, as in the heating operation mode described above.
- the first switching mechanism 22 is operated in the state of switching to the evaporation operation, and the heat source side heat is controlled by performing control to reduce the opening degree of the heat source side expansion valve 24. It may be performed periodically only when the liquid level of the refrigerant in the exchanger 23 is lowered and the refrigerant oil is not easily discharged together with the evaporated refrigerant.
- the entire usage units 3, 4 and 5 are empty.
- the operation when the heat source side heat exchange 23 of the heat source unit 2 is operated as a condenser according to the control load (condensing operation switching state) will be described.
- the refrigerant circuit 12 of the air conditioning apparatus 1 is configured as shown in FIG. 9 (refer to the arrows attached to the refrigerant circuit 12 of FIG. 9 for the flow of the refrigerant).
- the first shelf structure 22 is switched to the condensing operation switching state (the state indicated by the solid line of the first shelf structure 22 in FIG. 9). 2
- the switching mechanism 26 By switching the switching mechanism 26 to the heating load required operation state (the state indicated by the broken line in the second mechanism 26 in FIG. 9), the heat exchange 23 on the heat source side functions as a condenser and the high-pressure gas refrigerant communication pipe
- the high-pressure gas refrigerant compressed and discharged by the compression mechanism 21 can be supplied to the utilization unit 5 through 10.
- the heat source side expansion valve 24 is in an opened state.
- the on-off valve 101b of the first oil return circuit 101 and the on-off valve 102b of the first bypass circuit 102 are closed so that oil recovery operation using these circuits is not performed.
- the usage side heat exchange 32, 42 of the usage units 3, 4 and the suction side of the compression mechanism 21 of the heat source unit 2 are connected via the low pressure gas refrigerant communication pipe 11 (that is, cooling (Operation switching state).
- the usage-side expansion valves 31 and 41 include, for example, the degree of superheat of the usage-side heat exchange 32 and 42 (specifically, the refrigerant temperature detected by the liquid-side temperature sensors 33 and 43). And the opening degree is adjusted based on the cooling load of each usage unit, for example, the opening degree is adjusted based on the temperature difference between the refrigerant temperature detected by the gas side temperature sensors 34 and 44).
- the use side heat exchanger 52 of the use unit 5 is made to function as a condenser by closing the low pressure gas on / off valve 87 and opening the high pressure gas on / off valve 86.
- the usage side expansion valve 51 is, for example, the degree of supercooling of the usage side heat exchanger 52 (specifically, the refrigerant temperature detected by the liquid side temperature sensor 53 and the gas side temperature sensor 54).
- the opening degree is adjusted according to the heating load of the utilization unit, such as the opening degree is adjusted based on the temperature difference from the refrigerant temperature.
- the high-pressure gas refrigerant compressed and discharged by the compressor 21a of the compression mechanism 21 is mostly contained in the high-pressure gas refrigerant in the oil separator 21b. It is separated and sent to the first structure 22 and the second structure 26. The refrigerating machine oil separated in the oil separator 21b is returned to the suction side of the compressor 21a through the second oil return circuit 21d.
- the high-pressure gas refrigerant sent to the first switching mechanism 22 passes through the first port 22a and the second port 22b of the first switching mechanism 22, and the heat source Sent to side heat exchange 23.
- the high-pressure gas refrigerant sent to the heat source side heat exchanger 23 is condensed by exchanging heat with water as a heat source in the heat source side heat exchanger 23.
- the refrigerant condensed in the heat source side heat exchanger 23 passes through the heat source side expansion valve 24, and then the high pressure gas refrigerant compressed and discharged by the compression mechanism 21 through the pressurizing circuit 111 joins (details). Is sent to receiver 25).
- the refrigerant sent to the receiver 25 is temporarily stored in the receiver 25 and then sent to the cooler 121.
- the refrigerant sent to the cooler 121 is cooled by exchanging heat with the refrigerant flowing through the cooling circuit 122 (details will be described later). And cold
- the refrigerant cooled in the rejector 121 is sent to the liquid refrigerant communication pipe 9 through the liquid side closing valve 27.
- the high-pressure gas refrigerant sent to the second mechanism 26 is the first port 26a and the fourth port 26d of the second switching mechanism 26. Then, it is sent to the high-pressure gas refrigerant communication pipe 10 through the high-pressure gas side closing valve 28.
- the high-pressure gas refrigerant sent to the high-pressure gas refrigerant communication pipe 10 is sent to the high-pressure gas connection pipe 83 of the connection unit 8.
- the high-pressure gas refrigerant sent to the high-pressure gas connection pipe 83 of the connection unit 8 is sent to the use-side heat exchanger 52 of the use unit 5 through the high-pressure gas on-off valve 86 and the merged gas connection pipe 85.
- the high-pressure gas refrigerant sent to the use-side heat exchanger 52 is condensed by exchanging heat with indoor air in the use-side heat exchanger 52 of the use unit 5. On the other hand, indoor air is heated and supplied indoors.
- the refrigerant condensed in the use side heat exchanger 52 is sent to the liquid connection pipe 81 of the connection unit 8 after passing through the use side expansion valve 51.
- the refrigerant sent to the liquid connection pipe 81 is sent to the liquid refrigerant communication pipe 9, where the first switching mechanism 22, the heat source side heat exchanger 23, the heat source side expansion valve 24, the receiver 25, the cooling
- the refrigerant is sent to the liquid refrigerant communication pipe 9 through the vessel 121 and the liquid side closing valve 27.
- the refrigerant flowing through the liquid refrigerant communication pipe 9 is branched into two and sent to the liquid connection pipes 61 and 71 of the connection units 6 and 7. Then, the refrigerant sent to the liquid connection pipes 61 and 71 of the connection units 6 and 7 is sent to the use side expansion valves 31 and 41 of the use units 3 and 4.
- the refrigerant sent to the use side expansion valves 31 and 41 is depressurized by the use side expansion valves 31 and 41 and then exchanges heat with indoor air in the use side heat exchangers 32 and 42. It is evaporated and becomes a low-pressure gas refrigerant. On the other hand, indoor air is cooled and supplied indoors. Then, the low-pressure gas refrigerant is sent to the merged gas connection pipes 65 and 75 of the connection units 6 and 7.
- the low-pressure gas refrigerant sent to the merged gas connection pipes 65 and 75 is sent to the low-pressure gas refrigerant communication pipe 11 through the low-pressure gas on-off valves 67 and 77 and the low-pressure gas connection pipes 64 and 74. Shed.
- the low-pressure gas refrigerant sent to the low-pressure gas refrigerant communication pipe 11 is closed on the low-pressure gas side. It is returned to the suction side of the compression mechanism 21 through the valve 29. In this way, the operation is performed in the cooling and heating simultaneous operation mode (condensation load).
- the heat source side heat exchange requires a condensing load, which may be very small.
- the refrigerant condensing capacity in the heat source side heat exchanger 23 of the heat source unit 2 is reduced, and the air conditioning load and balance of the entire usage units 3, 4, and 5 are reduced. I have to let it.
- the cooling load of the usage units 3 and 4 and the heating load of the usage unit 5 may be approximately the same load.
- the condensation load of the heat source side heat exchanger 23 must be very small.
- a high-pressure gas refrigerant is joined to the downstream side of the heat source side expansion valve 24 through the pressurization circuit 111 while performing control to reduce the opening degree of the heat source side expansion valve 24.
- control is performed to increase the pressure of the refrigerant on the downstream side of the heat source side expansion valve 24, and the refrigerant that is decompressed by the heat source side expansion valve 24 and sent to the use side refrigerant circuits 12a and 12b is cooled by the cooler 121. Since cooling is performed, the gas refrigerant can be condensed, and it is not necessary to send a gas-liquid two-phase flow refrigerant with a large gas fraction to the use-side refrigerant circuits 12a and 12b.
- the air conditioner 1 of the present embodiment has the following features.
- the air conditioner 1 of the present embodiment includes a heat source side heat exchange configured such that when the refrigerant functions as a refrigerant evaporator, the refrigerant flows in from the lower side and the upper force also flows out.
- the exchanger 23 and the use side heat exchangers 32, 42, 52 are connected to the first notch 22 as the heat source side switching mechanism and the connection units 6, 7, 8 as the use side notch (specifically,
- the high-pressure gas on-off valves 66, 76, 86 and the low-pressure gas on-off valves 67, 77, 87) each have a refrigerant circuit 12 that can be switched to function as a refrigerant evaporator or condenser.
- the first discharge mechanism 22 is discharged from the compression mechanism 21.
- the refrigerant is used through the high-pressure gas refrigerant pipe including the high-pressure gas refrigerant communication pipe 10 to switch the connection units 6, 7, and 8 to the heating operation switching state, thereby functioning as a refrigerant condenser on the use side heat exchanger 32, It is sent to 42 and 52, condensed, and sent to the liquid refrigerant pipe including the liquid refrigerant communication pipe 9.
- the refrigerant is evaporated in the heat source side heat exchanger 23 and sucked into the compression mechanism 21.
- the refrigerant flows through the heat source side heat exchanger 23 so that the lower side force flows in and the upper side force flows out.
- control is performed to reduce the evaporation capacity of the heat source side heat exchanger 23 by reducing the opening degree of the heat source side expansion valve 24 according to the air conditioning load in the heat exchangers 32, 42, 52, the refrigeration oil is transferred to the heat source side. It will accumulate in the heat exchange.
- the air conditioner 1 since the air conditioner 1 includes the first bypass circuit 102 and the first oil return circuit 101, the air conditioner 1 is operated when the first switching mechanism 22 is operated in the evaporation operation switching state. Then, the refrigerant discharged from the compression mechanism 21 via the first bypass circuit 102 is bypassed to the suction side of the compression mechanism 21, the first switching mechanism 22 is switched to the condensing operation switching state, and the heat source side expansion valve 24 is closed. As a result, the refrigerant discharged from the compression mechanism 21 flows into the heat source side heat exchanger 23 ⁇ , and the refrigerating machine oil accumulated in the heat source side heat exchanger 23 through the first oil return circuit 101 is sucked into the compression mechanism 21. Oil recovery operation can be performed to return to the side.
- connection units 6, 7, and 8 are switched to the evaporation operation switching state while the first mechanism 22 is switched to the condensation operation switching state, and the refrigerant circuit 12 as a whole is switched. Therefore, it is not necessary to change the flow direction of the refrigerant! Therefore, it is possible to quickly start up after returning to the operating state before the oil recovery operation after the oil recovery operation, and thereby improve indoor comfort. In addition, it is possible to recover the refrigeration oil accumulated in the heat source side heat exchanger in a short time without loss.
- the opening degree of the heat source side expansion valve 24 is reduced in accordance with the air conditioning load of the use side heat exchangers 32, 42, 52, so that the heat source side heat exchanger 23 As a result, control is performed to reduce the evaporation capacity.As a result, even if the refrigerant level in the heat source side heat exchanger decreases, the refrigeration oil does not accumulate in the heat source side heat exchanger 23. It is possible to expand the control range when the evaporation capacity of the exchanger 23 is controlled by the heat source side expansion valve 24.
- this air conditioner 1 when a plurality of heat source side heat exchangers are provided and the heat source side heat exchange functions as an evaporator, a plurality of heat source side expansion valves are provided. Decrease the evaporation capacity by reducing the number of heat source side heat exchangers ⁇ that function as evaporators by closing a part, or allow some of the heat source side heat exchangers ⁇ to function as condensers This eliminates the need for control to reduce the evaporation capacity by offsetting the evaporation capacity of the heat source side heat exchanger functioning as an evaporator, so a wide range of evaporation capacity can be controlled by a single heat source side heat exchanger. You will be able to get
- a plate heat exchanger in which a large number of flow paths 23b are formed is used as the heat source side heat exchanger 23. Due to its structure, the heat source side heat exchanger 23 is refrigerated. In order to prevent the machine oil from accumulating, it is difficult to provide an oil return circuit for extracting the refrigeration oil in each flow path 23b of the heat source side heat exchanger 23. However, in this air conditioner 1, the refrigerating machine oil accumulated in the heat source side heat exchanger 23 is extracted so that the upper force of the heat source side heat exchanger 23 and the lower force of the heat source side heat exchange are pushed out together with the refrigerant flowing in. Therefore, it is easy to install the first oil return circuit 101 even when plate type heat exchange is used.
- the refrigerant condensed in the heat source side heat exchanger 23 functioning as a condenser is decompressed by the heat source side expansion valve 24 and sent to the use side refrigerant circuits 12a, 12b, 12c.
- the high pressure gas refrigerant from the pressurizing circuit 111 joins and is pressurized. As a result, the refrigerant pressure downstream of the heat source side expansion valve 24 increases.
- the refrigerant sent to the use-side refrigerant circuits 12a, 12b, 12c becomes a gas-liquid two-phase flow with a large gas fraction,
- the opening degree of the heat source side expansion valve 24 cannot be made sufficiently small, in the air conditioner 1, the pressure is reduced by the heat source side expansion valve 24 to the use side refrigerant circuits 12a, 12b, 12c. Since the refrigerant to be sent is cooled by the cooler 121, the gas refrigerant can be condensed, and a gas-liquid two-phase flow refrigerant having a large gas fraction in the use side refrigerant circuits 12a, 12b, 12c. You don't have to send
- the condensation capacity of the heat source side heat exchanger 23 is reduced by reducing the opening of the heat source side expansion valve 24 in accordance with the air conditioning load of the plurality of use side refrigerant circuits 12a, 12b, 12c.
- the use side refrigerant circuits 12a, 12b, and 12c have a gas-liquid two-phase flow refrigerant with a large gas fraction. This makes it possible to expand the control range when the heat source side heat exchange steaming capacity is controlled by the heat source side expansion valve 24.
- the air conditioner 1 when a plurality of heat source side heat exchangers are provided and the heat source side heat exchange functions as a condenser, as in the conventional air conditioner, some of the plurality of heat source side expansion valves are used.
- the number of heat source side heat exchangers ⁇ that function as evaporators and reducing the evaporation capacity, or by allowing some of the heat source side heat exchangers ⁇ to function as condensers Since it is not necessary to control to reduce the evaporation capacity by offsetting the evaporation capacity of the heat source side heat exchanger functioning as an evaporator, a wide range of condensation capacity control can be obtained by a single heat source side heat exchange Will be able to.
- the pressurization circuit 111 is connected so that the high-pressure gas refrigerant merges between the heat source side expansion valve 24 and the cooler 121. Therefore, the high-pressure gas refrigerant merges. Then, the refrigerant whose temperature has been increased is cooled by the cooler 121. As a result, a relatively high temperature cold heat source that does not require the use of a low temperature cold heat source can be used as the cold heat source for cooling the refrigerant in the cooler 121.
- a part of the refrigerant sent from the downstream side of the heat source side expansion valve 24 to the use side refrigerant circuits 12a, 12b, 12c is reduced to a refrigerant pressure that can be returned to the suction side of the compression mechanism 21. Since this is used as the cooling source for the cooler 121, the cooling source has a temperature sufficiently lower than the temperature of the refrigerant sent from the downstream side of the heat source side expansion valve 24 to the utilization side refrigerant circuit 12a, 12b, 12c. Can be obtained. This makes it possible to cool the refrigerant sent from the downstream side of the heat source side expansion valve 24 to the utilization side refrigerant circuits 12a, 12b, and 12c to a supercooled state.
- water that is supplied in a constant amount is used as a heat source regardless of the flow rate of the refrigerant flowing in the heat source side heat exchanger 23, and the heat source side heat exchanger 23 is controlled by controlling the amount of water.
- the evaporation capacity in can not be controlled.
- the control range when the evaporation capacity of the heat source side heat exchanger 23 is controlled by the heat source side expansion valve 24 is expanded, so even if the amount of water is not controlled, It is possible to secure a control range when controlling the evaporation capacity of the heat source side heat exchanger 23.
- the first oil return circuit 101 and the first bypass circuit 102 are provided to expand the control range of the evaporation capacity control of the heat source side heat exchanger 23 by the heat source side expansion valve 24.
- the heat source side expansion valve 24 is closed, so the flow of refrigerant from the liquid refrigerant communication pipe 9 toward the heat source side heat exchange stops. Warm out of the available units 3, 4, 5
- the heating operation of the usage unit is stopped during the cell operation (use units 3, 4, 5, and Fig. 5 in the heating operation mode) or the heating capacity is reduced (simultaneous cooling and heating operation mode (evaporation load)) Use units 4, 5 and Fig. 8).
- the refrigerant is branched from the liquid refrigerant pipe that connects the use side heat exchangers 32, 42, 52 and the heat source side heat exchanger 23.
- a second bypass circuit 103 that can be sent to the suction side of the compression mechanism 21 (specifically, the outlet pipe 122c of the cooling circuit 122 connected to the suction side of the compression mechanism 21) is provided.
- the second bypass circuit 103 mainly includes a bypass pipe 103a that connects a position between the use side heat exchange 32, 42, 52 of the liquid refrigerant pipe and the heat source side expansion valve 24 and the suction side of the compression mechanism 21. And an on-off valve 103b connected to the bypass pipe 103a.
- the bypass pipe 103a is provided so as to send the refrigerant from the upper part of the receiver 25 to the suction side of the compression mechanism 21, as shown in FIG. For this reason, when the on-off valve 103b is opened during the oil recovery operation, the gaseous refrigerant accumulated in the upper part of the receiver 25 is preferentially sent to the suction side of the compression mechanism 21.
- the no-pass pipe 103a only needs to be able to send the refrigerant to the suction side of the compression mechanism 21 by the positional force between the use side heat exchange 32, 42, 52 of the liquid refrigerant pipe and the heat source side expansion valve 24.
- the receiver 25 may be directly connected to the liquid refrigerant pipe, but in order to prevent the refrigerant in the liquid state from being sent to the suction side of the compressor mechanism 21 as much as possible, as in the present embodiment, the receiver 25 It is desirable to connect to the top.
- the second bypass circuit 103 By providing the second bypass circuit 103, it becomes possible to allow the refrigerant to flow through the use-side heat exchange of the use unit that is performing the heating operation even during the oil recovery operation, and the heating operation is performed. Can continue.
- the second bypass circuit 103 is provided so as to send the refrigerant from the upper part of the receiver 25 to the suction side of the compression mechanism 21, whereby the refrigerant in the gas state is given priority to the suction side of the compression mechanism 21. To prevent the liquid refrigerant from being sent as much as possible.
- the control range of the evaporation capacity control of the heat source side heat exchanger 23 by the heat source side expansion valve 24 and the control capacity of the heat source side heat exchanger 23 by the heat source side expansion valve 24 are controlled.
- the first bypass circuit Force for providing the heat source unit 2 with the path 102, the pressurizing circuit 111, the cooler 121, and the cooling circuit 122 in the case of the first modification, the second bypass circuit 103 is further included. If the control range of the control of the condensation capacity of 23 is secured, but it is necessary to expand only the control range of the control of the evaporation capacity of the heat exchanger 23 on the heat source side, as shown in Fig. 11.
- Only the first oil return circuit 101 and the first bypass circuit 102 (in the case of the first modification, further includes the second bypass circuit 103) are provided in the heat source unit 2, and the pressurizing circuit 111, the cooler 121, and the cooling The circuit 122 may be omitted.
- four-way switching valves are used as the first switching mechanism 22 and the second switching mechanism 26, but the present invention is not limited to this.
- a three-way valve may be used as the mechanism 22 and the second mechanism 26.
- the present invention includes a heat source side heat exchange configured such that when the refrigerant functions as a refrigerant evaporator, the refrigerant flows in the lower force and flows out from the upper side.
- a heat source side heat exchange configured such that when the refrigerant functions as a refrigerant evaporator, the refrigerant flows in the lower force and flows out from the upper side.
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Abstract
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05767222.2A EP1775527B1 (en) | 2004-08-04 | 2005-07-28 | Air conditioner |
ES05767222.2T ES2465643T3 (es) | 2004-08-04 | 2005-07-28 | Acondicionador de aire |
AU2005268315A AU2005268315B2 (en) | 2004-08-04 | 2005-07-28 | Air conditioner |
US10/586,582 US7607317B2 (en) | 2004-08-04 | 2005-07-28 | Air conditioner with oil recovery function |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-227662 | 2004-08-04 | ||
JP2004227662A JP3861891B2 (ja) | 2004-08-04 | 2004-08-04 | 空気調和装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006013769A1 true WO2006013769A1 (ja) | 2006-02-09 |
Family
ID=35787057
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/013814 WO2006013769A1 (ja) | 2004-08-04 | 2005-07-28 | 空気調和装置 |
Country Status (7)
Country | Link |
---|---|
US (1) | US7607317B2 (ja) |
EP (1) | EP1775527B1 (ja) |
JP (1) | JP3861891B2 (ja) |
CN (1) | CN100472149C (ja) |
AU (1) | AU2005268315B2 (ja) |
ES (1) | ES2465643T3 (ja) |
WO (1) | WO2006013769A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012043377A1 (ja) * | 2010-09-30 | 2012-04-05 | ダイキン工業株式会社 | 冷凍回路 |
WO2021225177A1 (ja) * | 2020-05-08 | 2021-11-11 | ダイキン工業株式会社 | 冷凍サイクル装置 |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
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JP5103952B2 (ja) * | 2007-03-08 | 2012-12-19 | ダイキン工業株式会社 | 冷凍装置 |
JP4285583B2 (ja) * | 2007-05-30 | 2009-06-24 | ダイキン工業株式会社 | 空気調和装置 |
WO2009103470A1 (en) * | 2008-02-21 | 2009-08-27 | Carrier Corporation | Refrigerating system |
US8794020B2 (en) * | 2009-09-10 | 2014-08-05 | Mitsubishi Electric Corporation | Air-conditioning apparatus |
US8839640B2 (en) | 2009-10-27 | 2014-09-23 | Mitsubishi Electric Corporation | Air-conditioning apparatus |
CN102753910B (zh) * | 2010-02-10 | 2015-09-30 | 三菱电机株式会社 | 冷冻循环装置 |
CN101865555B (zh) * | 2010-06-29 | 2012-10-03 | 广东志高空调有限公司 | 一种同时制冷和制热的一拖多空调 |
KR101995581B1 (ko) * | 2012-11-12 | 2019-07-02 | 엘지전자 주식회사 | 오일 분리기 및 이를 사용한 공기조화기 |
US10309698B2 (en) * | 2013-05-03 | 2019-06-04 | Trane International Inc. | Oil return management in a HVAC system |
JP6436196B1 (ja) * | 2017-07-20 | 2018-12-12 | ダイキン工業株式会社 | 冷凍装置 |
CN109405353B (zh) * | 2018-10-30 | 2021-02-23 | 广东美的暖通设备有限公司 | 回油控制方法及控制系统、存储介质和三管制空调系统 |
US20220228782A1 (en) * | 2019-06-12 | 2022-07-21 | Daikin Industries, Ltd. | Refrigerant cycle system |
CN112524836B (zh) * | 2020-12-17 | 2022-07-08 | 广东积微科技有限公司 | 一种三管制多联机系统及其控制方法 |
CN112594985B (zh) * | 2020-12-31 | 2022-04-19 | 广东积微科技有限公司 | 一种具有双四通阀多功能多联机系统的回油控制方法 |
CN114696400A (zh) | 2020-12-31 | 2022-07-01 | 奥动新能源汽车科技有限公司 | 充电仓和电连接移动的控制方法 |
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JP2003287291A (ja) * | 2002-03-27 | 2003-10-10 | Mitsubishi Electric Corp | 冷凍装置 |
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US4715196A (en) | 1986-04-11 | 1987-12-29 | Diesel Kiki Co., Ltd. | Oil returning mechanism of evaporator for air conditioner |
JPS63204074A (ja) | 1987-02-19 | 1988-08-23 | ダイキン工業株式会社 | 冷凍装置 |
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JP3781046B2 (ja) * | 2004-07-01 | 2006-05-31 | ダイキン工業株式会社 | 空気調和装置 |
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2004
- 2004-08-04 JP JP2004227662A patent/JP3861891B2/ja not_active Expired - Fee Related
-
2005
- 2005-07-28 ES ES05767222.2T patent/ES2465643T3/es active Active
- 2005-07-28 WO PCT/JP2005/013814 patent/WO2006013769A1/ja active Application Filing
- 2005-07-28 EP EP05767222.2A patent/EP1775527B1/en not_active Not-in-force
- 2005-07-28 AU AU2005268315A patent/AU2005268315B2/en not_active Ceased
- 2005-07-28 CN CNB2005800025578A patent/CN100472149C/zh not_active Expired - Fee Related
- 2005-07-28 US US10/586,582 patent/US7607317B2/en not_active Expired - Fee Related
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JPH0336474A (ja) * | 1989-07-03 | 1991-02-18 | Toshiba Corp | 空気調和機 |
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JP2003240364A (ja) * | 2002-02-19 | 2003-08-27 | Denso Corp | 冷凍サイクル装置及びヒートポンプ式空調装置 |
JP2003287291A (ja) * | 2002-03-27 | 2003-10-10 | Mitsubishi Electric Corp | 冷凍装置 |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012043377A1 (ja) * | 2010-09-30 | 2012-04-05 | ダイキン工業株式会社 | 冷凍回路 |
JP2012077983A (ja) * | 2010-09-30 | 2012-04-19 | Daikin Industries Ltd | 冷凍回路 |
WO2021225177A1 (ja) * | 2020-05-08 | 2021-11-11 | ダイキン工業株式会社 | 冷凍サイクル装置 |
Also Published As
Publication number | Publication date |
---|---|
ES2465643T3 (es) | 2014-06-06 |
US7607317B2 (en) | 2009-10-27 |
EP1775527A4 (en) | 2013-02-20 |
US20080236189A1 (en) | 2008-10-02 |
AU2005268315B2 (en) | 2008-05-29 |
AU2005268315A1 (en) | 2006-02-09 |
CN100472149C (zh) | 2009-03-25 |
JP3861891B2 (ja) | 2006-12-27 |
CN1910409A (zh) | 2007-02-07 |
EP1775527B1 (en) | 2014-03-05 |
EP1775527A1 (en) | 2007-04-18 |
JP2006046779A (ja) | 2006-02-16 |
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