JP2010107141A - Refrigerating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To use the heat generated by compression work in an effective manner, while cooling a refrigerant in the compression stroke of a compression mechanism, even in a refrigerant-circulating state that required heating capacity, in a refrigerating device that includes a refrigerant circuit capable of changing over the circulating direction of the refrigerant. <P>SOLUTION: An air conditioner 1, having the refrigerant circuit 10 capable of changing over the circulating direction of the refrigerant by a refrigerant circulating direction switching valve 23, includes a heating medium circuit 11 which includes: a first heating medium cooler 42 for cooling a heating medium, separated from the refrigerant circuit 10 by a cooling source which is not caused by the refrigerant circuit 10; a second heating medium cooler 43 for cooling the heating medium by a cooling source arising from the refrigerant circuit 10; a heating medium cooler switching valve 44 for switching the first heating medium cooler 42 and the second heating medium cooler 43; and a compression mechanism cooler 48 for cooling the refrigerant which is made to flow in a compressor 21 by the heating medium, cooled by the first heating medium cooler 42 or the second heating medium cooler 43. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a refrigeration apparatus, and more particularly, to a refrigeration apparatus having a refrigerant circuit capable of switching a refrigerant circulation direction.

  Conventionally, as a refrigeration apparatus having a refrigerant circuit capable of switching the refrigerant circulation direction, air that can be switched between cooling and heating by switching the refrigerant circulation direction in the refrigerant circuit using a four-way switching valve. There is a harmony device. In such an air conditioner, the refrigerant circulates in the refrigerant circuit by the compression operation of the compressor.

Further, Patent Document 1 adopts a configuration that cools the refrigerant in the compression stroke by providing an intercooler in the compressor constituting the refrigerant circuit, thereby reducing the compression power in the compression stroke. Are listed.
JP-T 6-505330

  In the above-described air conditioner capable of switching between cooling and heating, when the configuration for cooling the refrigerant in the compression stroke of the compressor described in Patent Document 1 is adopted, the refrigerant circulation direction is either cooling or heating. This is advantageous because the compression power is reduced even in the state.

  However, when the refrigerant in the compression stroke is cooled by outdoor air or cooling water, there is a problem that heat generated by the compression work cannot be effectively used in the circulation state of the refrigerant that requires a heating capability such as heating. Will occur.

  An object of the present invention is to provide a refrigeration apparatus having a refrigerant circuit capable of switching the refrigerant circulation direction, while cooling the refrigerant during the compression stroke of the compression mechanism, even in the refrigerant circulation state where heating capacity is required. The purpose is to make effective use of heat generated by work.

  A refrigeration apparatus according to a first aspect of the present invention includes a refrigerant circuit having a compression mechanism for compressing refrigerant, a heat source side heat exchanger, a use side heat exchanger, and a refrigerant circulation direction switching mechanism, a first heat medium cooler, and a second heat medium cooler. A heat medium circuit having a heat medium cooler, a heat medium cooler switching mechanism, and a compression mechanism cooler is provided. The refrigerant circulation direction switching mechanism causes the heat source side heat exchanger to function as a heat radiator that radiates heat of the refrigerant compressed in the compression mechanism, and evaporates the refrigerant that has radiated heat in the heat source side heat exchanger. A first refrigerant circulation state that functions as an evaporator, a use-side heat exchanger that functions as a radiator that radiates heat of the refrigerant compressed in the compression mechanism, and a heat source-side heat exchanger that radiates heat in the use-side heat exchanger This is a mechanism for switching the second refrigerant circulation state to function as an evaporator for evaporating the refrigerant. The first heat medium cooler is a cooler that cools a heat medium separated from the refrigerant circuit or a heat medium different from the refrigerant flowing through the refrigerant circuit by a cooling source that does not originate from the refrigerant circuit. A 2nd heat carrier cooler is a cooler which cools a heat carrier with the cooling source resulting from a refrigerant circuit. The heat medium cooler switching mechanism includes a first heat medium cooling state in which the first heat medium cooler is used when the first refrigerant circulation state is set, and a second heat medium cooler when the second refrigerant circulation state is set. This is a mechanism for switching between the second heat medium cooling state to be used. The compression mechanism cooler is a cooler that cools the refrigerant flowing through the compression mechanism with the heat medium cooled in the first heat medium cooler or the second heat medium cooler. Here, the “cooling source due to the refrigerant circuit” has the ability to cool the heat medium by heat exchange with the refrigerant flowing through the refrigerant circuit and the refrigerant circuit flowing through the refrigerant circuit such as drain water or heat storage material. The “cooling source not caused by the refrigerant circuit” means one having the ability to cool the heat medium irrespective of the refrigerant flowing through the refrigerant circuit such as outdoor air or cooling water.

  In this refrigeration apparatus, when the refrigerant circulation direction switching mechanism is in the first refrigerant circulation state, the refrigerant compressed in the compression mechanism mainly passes through the refrigerant circuit in the order of the heat source side heat exchanger and the usage side heat exchanger. Since the heat medium cooler switching mechanism is in the first heat medium cooling state, the heat medium that circulates and is separated from the heat medium that is circulated or separated from the refrigerant circuit or the refrigerant circuit flows in the first heat medium cooler, After being cooled by a cooling source not caused by the refrigerant circuit, in the compression mechanism cooler, the heat medium circuit is circulated so as to cool the refrigerant flowing through the compression mechanism. Further, when the refrigerant circulation direction switching mechanism is in the second refrigerant circulation state, the refrigerant compressed in the compression mechanism mainly circulates in the refrigerant circuit in the order of the use side heat exchanger and the heat source side heat exchanger, The heat medium separated from the refrigerant circuit or the heat medium different from the refrigerant flowing in the refrigerant circuit is in the second heat medium cooling state in the second heat medium cooler because the heat medium cooler switching mechanism is in the second heat medium cooling state. After being cooled by the resulting cooling source, in the compression mechanism cooler, the heat medium circuit is circulated to cool the refrigerant flowing through the compression mechanism. That is, when the refrigerant circulation direction switching mechanism is in the second refrigerant circulation state, heating capacity is required. However, the refrigerant circulation direction switching mechanism is separated from the refrigerant circuit as in the case where the refrigerant circulation direction switching mechanism is in the first refrigerant circulation state. When a heat medium different from the refrigerant flowing through the heat medium or the refrigerant circuit is cooled by a cooling source that does not originate from the refrigerant circuit, a heat dissipation loss occurs such as simply radiating heat to the outside. When the refrigerant circulation direction switching mechanism is in the second refrigerant circulation state, the heat medium separated from the refrigerant circuit or a heat medium different from the refrigerant flowing through the refrigerant circuit is cooled by a cooling source originating from the refrigerant circuit, and heat is dissipated. Loss can be prevented from occurring.

  Thereby, in this refrigeration apparatus, even when the refrigerant circulation direction switching mechanism is in the second refrigerant circulation state, the heat generated by the compression work is effectively used while cooling the refrigerant during the compression stroke of the compression mechanism. Can do.

  The refrigeration apparatus according to a second aspect of the present invention is the refrigeration apparatus according to the first aspect of the present invention, wherein the heat source side heat exchanger is a heat exchanger that radiates or evaporates the refrigerant by outdoor air, and is a cooling source caused by the refrigerant circuit Is drain water generated in the heat source side heat exchanger.

  In this refrigeration apparatus, when the refrigerant circulation direction switching mechanism is in the second refrigerant circulation state, the refrigerant compressed in the compression mechanism mainly passes through the refrigerant circuit in the order of the use side heat exchanger and the heat source side heat exchanger. In the second heat medium cooler, the heat medium that circulates and is separated from the refrigerant circuit or the refrigerant that flows through the refrigerant circuit has a heat medium cooler switching mechanism in the second heat medium cooling state. After being cooled by the drain water generated in the heat source side heat exchanger, the refrigerant flowing through the compression mechanism is cooled in the compression mechanism cooler. That is, in this refrigeration device, when the refrigerant circulation direction switching mechanism is in the second refrigerant circulation state, the heat medium separated from the refrigerant circuit or a heat medium different from the refrigerant flowing through the refrigerant circuit is used as the heat source side heat exchanger. The heat of the heated drain water is used to prevent freezing of the drain water in the heat source side heat exchanger and its drain pan and to suppress crystal growth, thereby reducing heat dissipation. Can be suppressed.

  Thereby, in this refrigeration apparatus, even when the refrigerant circulation direction switching mechanism is in the second refrigerant circulation state, the heat generated by the compression work is effectively used while cooling the refrigerant during the compression stroke of the compression mechanism. Can do. In particular, this refrigeration apparatus has an advantage that it is possible to prevent freezing of the drain water in the heat source side heat exchanger and its drain pan and to suppress crystal growth.

  A refrigeration apparatus according to a third aspect is the refrigeration apparatus according to the first aspect, wherein the cooling source resulting from the refrigerant circuit is a refrigerant in the heat source side heat exchanger.

  In this refrigeration apparatus, when the refrigerant circulation direction switching mechanism is in the second refrigerant circulation state, the refrigerant compressed in the compression mechanism mainly passes through the refrigerant circuit in the order of the use side heat exchanger and the heat source side heat exchanger. In the second heat medium cooler, the heat medium that circulates and is separated from the refrigerant circuit or the refrigerant that flows through the refrigerant circuit has a heat medium cooler switching mechanism in the second heat medium cooling state. After being cooled by the refrigerant in the heat source side heat exchanger, the refrigerant flowing through the compression mechanism is cooled in the compression mechanism cooler. That is, in this refrigeration device, when the refrigerant circulation direction switching mechanism is in the second refrigerant circulation state, the heat medium separated from the refrigerant circuit or a heat medium different from the refrigerant flowing through the refrigerant circuit is used as the heat source side heat exchanger. It is possible to suppress the occurrence of heat radiation loss by cooling with the refrigerant in the heat source and using the heat in the heat source side heat exchanger to reduce the evaporation load in the heat source side heat exchanger.

  Thereby, in this refrigeration apparatus, even when the refrigerant circulation direction switching mechanism is in the second refrigerant circulation state, the heat generated by the compression work is effectively used while cooling the refrigerant during the compression stroke of the compression mechanism. Can do. In particular, this refrigeration apparatus has an advantage that the evaporation load in the heat source side heat exchanger can be reduced.

  A refrigeration apparatus according to a fourth aspect of the present invention is the refrigeration apparatus according to the first aspect of the present invention, wherein the cooling source resulting from the refrigerant circuit is a refrigerant flowing between the heat source side heat exchanger and the compression mechanism.

  In this refrigeration apparatus, when the refrigerant circulation direction switching mechanism is in the second refrigerant circulation state, the refrigerant compressed in the compression mechanism mainly passes through the refrigerant circuit in the order of the use side heat exchanger and the heat source side heat exchanger. In the second heat medium cooler, the heat medium that circulates and is separated from the refrigerant circuit or the refrigerant that flows through the refrigerant circuit has a heat medium cooler switching mechanism in the second heat medium cooling state. After being cooled by the refrigerant in the heat source side heat exchanger, the refrigerant flowing through the compression mechanism is cooled in the compression mechanism cooler. That is, in this refrigeration device, when the refrigerant circulation direction switching mechanism is in the second refrigerant circulation state, the heat medium separated from the refrigerant circuit or a heat medium different from the refrigerant flowing through the refrigerant circuit is used as the heat source side heat exchanger. It is possible to suppress a heat radiation loss from being generated by heating the refrigerant flowing between the heat source side heat exchanger and the compression mechanism.

  Thereby, in this refrigeration apparatus, even when the refrigerant circulation direction switching mechanism is in the second refrigerant circulation state, the heat generated by the compression work is effectively used while cooling the refrigerant during the compression stroke of the compression mechanism. Can do.

  The refrigeration apparatus according to a fifth aspect of the invention is the refrigeration apparatus according to the first aspect of the invention, wherein the heat source side heat exchanger is a heat exchanger that radiates or evaporates the refrigerant by outdoor air, and is a cooling source caused by the refrigerant circuit Is a heat storage material.

  In this refrigeration apparatus, when the refrigerant circulation direction switching mechanism is in the second refrigerant circulation state, the refrigerant compressed in the compression mechanism mainly passes through the refrigerant circuit in the order of the use side heat exchanger and the heat source side heat exchanger. In the second heat medium cooler, the heat medium that circulates and is separated from the refrigerant circuit or the refrigerant that flows through the refrigerant circuit has a heat medium cooler switching mechanism in the second heat medium cooling state. After being cooled by the refrigerant in the heat source side heat exchanger, the refrigerant flowing through the compression mechanism is cooled in the compression mechanism cooler. That is, in this refrigeration apparatus, when the refrigerant circulation direction switching mechanism is in the second refrigerant circulation state, the heat medium separated from the refrigerant circuit or the heat medium different from the refrigerant flowing through the refrigerant circuit is cooled by the heat storage material. The heat stored by the heating of the heat storage material can be used as a heat source for defrosting the heat source side heat exchanger, so that a heat dissipation loss can be suppressed.

  Thereby, in this refrigeration apparatus, even when the refrigerant circulation direction switching mechanism is in the second refrigerant circulation state, the heat generated by the compression work is effectively used while cooling the refrigerant during the compression stroke of the compression mechanism. Can do. In particular, this refrigeration apparatus has an advantage that it can be used as a heat source for defrosting the heat source side heat exchanger.

  A refrigeration apparatus according to a sixth invention is the refrigeration apparatus according to any one of the first to fifth inventions, wherein the refrigerant circuit further has an oil separation mechanism for separating the refrigeration oil from the refrigerant compressed in the compression mechanism. The heat medium separated from the refrigerant circuit is refrigeration oil separated in the oil separation mechanism.

  In this refrigeration apparatus, a compression medium is used while cooling the refrigerant during the compression stroke of the compression mechanism using the heat medium separated from the refrigerant circuit, even when the refrigerant circulation direction switching mechanism is in the second refrigerant circulation state. The heat generated in is effectively used.

  A refrigeration apparatus according to a seventh invention is the refrigeration apparatus according to any of the sixth inventions, wherein the heat medium cools the refrigerant flowing through the compression mechanism in the compression mechanism cooler and then the compression mechanism and the oil separation mechanism of the refrigerant circuit To the position between.

  In this refrigeration apparatus, since the heat medium circuit is circulated so that the refrigeration oil separated in the oil separation mechanism is returned between the compression mechanism and the oil separation mechanism, the refrigeration oil is provided in a portion away from the compression mechanism of the refrigerant circuit. Is less likely to be distributed, and the flow rate of the refrigerating machine oil circulating in the heat medium circuit is stabilized, whereby a stable cooling capacity of the compression mechanism cooler can be obtained.

  A refrigeration apparatus according to an eighth invention is the refrigeration apparatus according to any one of the first to fifth inventions, wherein the heat medium circuit is a closed circuit in which a heat medium different from the refrigerant flowing through the refrigerant circuit circulates.

  In this refrigeration apparatus, since the heat medium circuit is a closed circuit in which a heat medium different from the refrigerant flowing in the refrigerant circuit circulates, the flow rate of the heat medium that circulates in the heat medium circuit is stabilized, thereby providing a stable compression mechanism. The cooling capacity of the cooler can be obtained.

  A refrigeration apparatus according to a ninth aspect is the refrigeration apparatus according to any one of the first to eighth aspects, wherein the refrigerant enclosed in the refrigerant circuit is carbon dioxide.

  As described above, according to the present invention, the following effects can be obtained.

  In the first, fourth, sixth and ninth inventions, even when the refrigerant circulation direction switching mechanism is in the second refrigerant circulation state, the refrigerant is generated by compression work while cooling the refrigerant during the compression stroke of the compression mechanism. Heat can be used effectively.

  The second invention is particularly advantageous in that it is possible to prevent freezing of the drain water in the heat source side heat exchanger and its drain pan and to suppress crystal growth.

  In the third invention, there is an advantage that the evaporation load in the heat source side heat exchanger can be particularly reduced.

  The fifth aspect of the invention has an advantage that it can be used as a heat source for defrosting the heat source side heat exchanger.

  In the seventh and eighth inventions, a stable cooling capability of the compression mechanism cooler can be obtained.

  Hereinafter, an embodiment of a refrigeration apparatus according to the present invention will be described based on the drawings.

(1) Configuration of Air Conditioner FIG. 1 is a schematic configuration diagram of an air conditioner 1 as a refrigeration apparatus according to an embodiment of the present invention. The air conditioner 1 mainly includes an outdoor unit 2 and an indoor unit 5, and a liquid refrigerant communication pipe 6 and a gas refrigerant communication pipe 7 that connect the outdoor unit 2 and the indoor unit 5, and cooling operation and heating operation. The refrigerant circuit 10 that can be switched is configured. The refrigerant circuit 10 contains carbon dioxide as a refrigerant and polyalkylene glycol (PAG) as a refrigerating machine oil. The air conditioner 1 performs a supercritical refrigeration cycle in which the refrigerant is compressed to a pressure exceeding the critical pressure.

<Indoor unit>
The indoor unit 5 is connected to the outdoor unit 2 via the liquid refrigerant communication pipe 6 and the gas refrigerant communication pipe 7 and constitutes a part of the refrigerant circuit 10.

  The indoor unit 5 mainly has an indoor refrigerant circuit 10 a that constitutes a part of the refrigerant circuit 10. This indoor refrigerant circuit 10a mainly has an indoor heat exchanger 51 as a use side heat exchanger.

  During the cooling operation, the indoor heat exchanger 51 processes the indoor heat load with the refrigerant radiated in the outdoor heat exchanger 24 (described later) as the heat source side heat exchanger (that is, heating that transports the indoor heat load). It functions as an evaporator that evaporates by exchanging heat with indoor air or the like as a medium), and at the time of heating operation, the refrigerant compressed in a compressor 21 (described later) as a compression mechanism is treated with an indoor heat load ( That is, it is a heat exchanger that can function as a radiator that radiates heat by exchanging heat with indoor air or the like as a cooling medium that transports an indoor heat load. The indoor heat exchanger 51 has a liquid side connected to the liquid refrigerant communication tube 6 and a gas side connected to the gas refrigerant communication tube 7.

  The indoor unit 5 has an indoor side control unit 52 that controls the operation of each unit constituting the indoor unit 5. And the indoor side control part 52 has the microcomputer, memory, etc. which were provided in order to control the indoor unit 5, and is with the remote control (not shown) for operating the indoor unit 5 separately. Control signals and the like can be exchanged between them, and control signals and the like can be exchanged with the outdoor unit 2 via the transmission line 8a.

<Outdoor unit>
The outdoor unit 2 is connected to the indoor unit 5 via the liquid refrigerant communication tube 6 and the gas refrigerant communication tube 7, and constitutes a refrigerant circuit 10 between the indoor units 5.

  The outdoor unit 2 mainly has an outdoor refrigerant circuit 10 b that constitutes a part of the refrigerant circuit 10. The outdoor refrigerant circuit 10b mainly includes a compressor 21 as a compression mechanism, an oil separator 22 as an oil separation mechanism, a refrigerant circulation direction switching valve 23 as a refrigerant circulation direction switching mechanism, and a heat source side heat exchanger. As an outdoor heat exchanger 24 and an outdoor expansion valve 25 as an expansion mechanism.

  The compressor 21 is a single-stage compression type positive displacement compressor provided for compressing a refrigerant, and mainly includes a compression element 21a and a compressor motor 21b for driving the compression element 21a. The compression element 21a is a rotary type or scroll type compression element. The compressor motor 21b is configured such that the operating frequency (that is, the rotation speed) can be varied by an inverter.

  The oil separator 22 is a mechanism for separating refrigeration oil from the refrigerant compressed in the compressor 21, and is provided between the discharge of the compressor 21 and the refrigerant circulation direction switching valve 23. Various types of oil separators 22 can be used. In the present embodiment, an outlet for refrigerating machine oil is formed in the lower part of the substantially cylindrical sealed container, and the upper part of the substantially cylindrical sealed container. A type is used in which an outlet for the refrigerant is formed, and an inlet for the refrigerant compressed in the compressor 21 is formed at an intermediate portion between the outlet for the refrigerating machine oil and the outlet for the refrigerant.

  The refrigerant circulation direction switching valve 23 is a four-way switching valve provided for switching the direction of the refrigerant flow in the refrigerant circuit 10, and the cooling of the refrigerant compressed in the compressor 21 by the outdoor heat exchanger 24 during the cooling operation. The discharge of the compressor 21 and the outdoor heat exchanger 24 are performed so as to function as a radiator and to be in a first refrigerant circulation state in which the indoor heat exchanger 51 functions as an evaporator of the refrigerant radiated in the outdoor heat exchanger 24. And the gas refrigerant communication pipe 7 (see the solid line of the refrigerant circulation direction switching valve 23 in FIG. 1), and the indoor heat exchanger 51 is connected during the heating operation. To function as a radiator for the refrigerant compressed in the compressor 21 and to enter a second refrigerant circulation state in which the outdoor heat exchanger 24 functions as an evaporator for the refrigerant radiated in the indoor heat exchanger 51. It is possible to connect the discharge of the compressor 21 and the gas refrigerant communication pipe 7 and connect the suction of the compressor 21 and the gas side of the outdoor heat exchanger 24 (the refrigerant circulation direction switching valve 23 in FIG. 1). See the dashed line).

  The outdoor heat exchanger 24 functions as a radiator that radiates heat by exchanging heat between the refrigerant compressed in the compressor 21 and outdoor air as a cooling medium during the cooling operation, and in the indoor heat exchanger 51 during the heating operation. It is a heat exchanger capable of functioning as an evaporator that evaporates by exchanging heat of the radiated refrigerant with outdoor air as a heating medium. The outdoor heat exchanger 24 has a gas side connected to the refrigerant circulation direction switching valve 23 and a liquid side connected to the outdoor expansion valve 25.

  The outdoor expansion valve 25 is an electric expansion valve connected to the liquid side of the outdoor heat exchanger 24 in order to depressurize the refrigerant flowing between the outdoor heat exchanger 24 and the indoor heat exchanger 51.

  The outdoor unit 2 includes a heat medium circuit 11 through which a heat medium separated from the refrigerant circuit 10 flows. The heat medium circuit 11 is a circuit in which the refrigeration oil separated from the refrigerant in the oil separator 22 circulates as a heat medium separated from the refrigerant circuit 10, and mainly includes a heat medium circulation pipe 41.

  One end of the heat medium circulation pipe 41 is connected to the refrigerating machine oil outlet of the oil separator 22, and the other end is connected to a position between the compressor 21 and the oil separator 22 of the refrigerant circuit 10. The first heat medium junction pipe 41a extending from the refrigerator oil outlet of the oil separator 22, the first and second heat medium branch pipes 41b and 41c branching the first heat medium junction pipe 41a into two, the first and first And a second heat medium junction pipe 41d that joins the two heat medium branch pipes 41b and 41c.

  A first heat medium cooler 42 is provided in the first heat medium branch pipe 41b.

  The first heat medium cooler 42 is a cooler that cools the refrigerating machine oil separated from the refrigerant circuit 10 by a cooling source that does not originate from the refrigerant circuit 10. Here, the “cooling source not caused by the refrigerant circuit” means one having the ability to cool the heat medium regardless of the refrigerant flowing through the refrigerant circuit 10 such as outdoor air or cooling water. As the cooler 42, for example, a heat exchanger that cools the refrigerating machine oil flowing through the first heat medium branch pipe 41 b using outdoor air as a cooling source that does not originate from the refrigerant circuit 10 can be used.

  A second heat medium cooler 43 is provided in the second heat medium branch pipe 41c.

  The second heat medium cooler 43 is a cooler that cools the refrigerating machine oil separated from the refrigerant circuit 10 by a cooling source originating from the refrigerant circuit 10. Here, the “cooling source resulting from the refrigerant circuit” means a refrigerant that has the ability to cool the heat medium by heat exchange with the refrigerant flowing through the refrigerant circuit 10 and the refrigerant flowing through the refrigerant circuit 10. As the heat medium cooler 43, for example, the refrigerant in the outdoor heat exchanger 24 as the heat source side heat exchanger is used as a cooling source originating from the refrigerant circuit 10, and the refrigerating machine oil flowing through the second heat medium branch pipe 41c is cooled. Can be used for heat exchangers.

  A heat medium cooler switching valve 44 serving as a heat medium cooler switching mechanism is provided at a branch portion between the first heat medium merging pipe 41a and the first and second heat medium branch pipes 41b and 41c. Time (ie, when the refrigerant circulation direction switching valve 23 is in the first refrigerant circulation state), the first heat medium branch pipe 41b is connected to the first heat medium junction pipe 41a and the second heat medium branch pipe 41c is connected. The first heat medium cooler 42 is not connected to the first heat medium junction pipe 41a (here, the second heat medium branch pipe 41c is connected to the suction side of the compressor 21 via the heat medium pipe 41e). In the first heat medium cooling state (see the solid line of the heat medium cooler switching valve 44 in FIG. 1) and in the heating operation (that is, when the refrigerant circulation direction switching valve 23 is in the second refrigerant circulation state). The second heat medium branch pipe 41c is changed to the first heat medium junction pipe 41a. The first heat medium branch pipe 41b is not connected to the first heat medium junction pipe 41a (here, the first heat medium branch pipe 41b is connected to the suction side of the compressor 21 via the heat medium pipe 41e). In this way, the second oil cooling state using the second heat medium cooler 43 (see the broken line of the heat medium cooler switching valve 44 in FIG. 1) can be switched.

  On the outlet side of the first heat medium cooler 42 of the first heat medium branch pipe 41b, a first check that allows only the flow of refrigerating machine oil from the first heat medium merging pipe 41a toward the second heat medium merging pipe 41d. A valve 45 is provided. On the outlet side of the second heat medium cooler 43 of the second heat medium branch pipe 41c, a second check that allows only the flow of refrigerating machine oil from the first heat medium merging pipe 41a toward the second heat medium merging pipe 41d. A valve 46 is provided.

  A heat medium pump 47 and a compression mechanism cooler 48 are provided in the second heat medium junction pipe 41d.

  The heat medium pump 47 is a pump that circulates the refrigerating machine oil in the heat medium circuit 11, and mainly includes a boosting element 47a that boosts the refrigerating machine oil and a pump motor 47b that drives the boosting element 47a. The pump motor 47b can change the operating frequency (that is, the rotation speed) by an inverter.

  The compression mechanism cooler 48 is a cooler that cools the refrigerant flowing through the compressor 21 with the refrigerating machine oil cooled in the first heat medium cooler 42 or the second heat medium cooler 43. In the present embodiment, the compression mechanism cooler 48 is provided on the downstream side of the heat medium pump 47.

  Furthermore, the outdoor unit 2 is provided with various sensors. Specifically, the outdoor unit 2 is provided with a suction temperature sensor 26 that detects the suction temperature of the compressor 21 and a discharge temperature sensor 27 that detects the discharge temperature of the compressor 21. In this embodiment, the intake temperature sensor 26 and the discharge temperature sensor 27 are thermistors. In addition, the outdoor unit 2 has an outdoor side control unit 28 that controls the operation of each unit constituting the outdoor unit 2. The outdoor control unit 28 includes a microcomputer, a memory, and the like provided for controlling the outdoor unit 2, and communicates with the indoor side control unit 52 of the indoor unit 5 via the transmission line 8 a. The control signals can be exchanged. That is, the control part 8 which performs operation control of the whole air conditioning apparatus 1 is comprised by the indoor side control part 52, the outdoor side control part 28, and the transmission line 8a which connects between the control parts 28 and 52.

  Based on the detection signals of the various sensors 26 and 27, the control unit 8 performs various devices 21 (specifically, a compressor motor 21b), 23, 25, 44, and 47 (specifically, a pump motor 47b) and the like. Is to control.

<Refrigerant communication pipe>
The refrigerant communication pipes 6 and 7 are refrigerant pipes that are constructed on site when the air conditioner 1 is installed at the installation location. The liquid refrigerant communication pipe 6 is connected to the outdoor unit 2 and the indoor unit 5, and during the cooling operation, the refrigerant that has passed through the outdoor unit 2 is sent to the indoor unit 5, and during the heating operation, the refrigerant that has passed through the indoor unit 5 is sent. A refrigerant pipe to be sent to the outdoor unit 2. The gas refrigerant communication pipe 7 is connected to the outdoor unit 2 and the indoor unit 5, and during the cooling operation, the refrigerant that has passed through the indoor unit 5 is sent to the outdoor unit 2, and during the heating operation, the refrigerant that has passed through the outdoor unit 2 is sent. It is a refrigerant pipe sent to the indoor unit 5.

(2) Operation | movement of an air conditioning apparatus Next, operation | movement of the air conditioning apparatus 1 of this embodiment is demonstrated using FIG.

<Cooling operation>
During the cooling operation, the refrigerant circulation direction switching valve 23 as the refrigerant circulation direction switching mechanism is set to the first refrigerant circulation state indicated by the solid line in FIG. The degree of opening of the outdoor expansion valve 25 as an expansion mechanism is adjusted. Further, the heat medium cooler switching valve 44 as the heat medium cooler switching mechanism is set to the first heat medium cooling state indicated by the solid line in FIG.

  In the state of the refrigerant circuit 10 and the heat medium circuit 11, the low-pressure refrigerant in the refrigeration cycle is sucked into the compressor 21 as the compression mechanism and compressed by the compression element 21a to a pressure higher than the critical pressure of the refrigerant. It is discharged as a high-pressure refrigerant in the refrigeration cycle. The high-pressure refrigerant discharged from the compressor 21 is sent to an oil separator 22 as an oil separation mechanism. The high-pressure refrigerant is separated from refrigerating machine oil in the oil separator 22. The high-pressure refrigerant after the refrigerating machine oil is separated is sent from the refrigerant outlet to the outdoor heat exchanger 24 as the heat source side heat exchanger through the refrigerant circulation direction switching valve 23 to exchange heat with the outdoor air as the cooling medium. To dissipate heat. The high-pressure refrigerant that has radiated heat in the outdoor heat exchanger 24 is decompressed by the outdoor expansion valve 25 and becomes a low-pressure gas-liquid two-phase refrigerant in the refrigeration cycle. The low-pressure gas-liquid two-phase refrigerant is sent from the outdoor unit 2 to the indoor unit 5 through the liquid refrigerant communication tube 6. The refrigerant sent to the indoor unit 5 is sent to an indoor heat exchanger 51 as a use side heat exchanger, and evaporates by exchanging heat with indoor air or the like as a heating medium. The low-pressure refrigerant evaporated in the indoor heat exchanger 51 is sent from the indoor unit 5 to the outdoor unit 2 through the gas refrigerant communication pipe 7. The low-pressure refrigerant sent to the outdoor unit 2 is again sucked into the compressor 21 through the refrigerant circulation direction switching valve 23.

  During such cooling operation, the refrigerating machine oil separated in the oil separator 22 flows into the heat medium circuit 11 as a heat medium separated from the refrigerant circuit 10. The refrigerating machine oil that has flowed into the heat medium circuit 11 is cooled by outdoor air as a cooling source that does not originate from the refrigerant circuit 10 in the first heat medium cooler 42, and is pressurized by the heat medium pump 47 to be compressed. It is sent to the cooler 48. The refrigerating machine oil sent to the compression mechanism cooler 48 cools the refrigerant flowing through the compressor 21 in the compression mechanism cooler 48 and then returns to the position between the compressor 21 and the oil separator 22 in the refrigerant circuit 10. It is. Thereby, in the compressor 21, the refrigerant | coolant in a compression stroke is cooled, the compression stroke in the compressor 21 comes close to isothermal compression, and compression power can be made small.

  At this time, the operation capacity of the heat medium pump 47 is controlled based on the suction temperature and the discharge temperature of the compressor 21 detected by the suction temperature sensor 26 and the discharge temperature sensor 27 (here, the operation frequency of the pump motor 47b is set). The degree of cooling of the refrigerant during the compression stroke may be adjusted. For example, when the temperature difference obtained by subtracting the suction temperature from the discharge temperature of the compressor 21 exceeds a predetermined temperature difference, the operating frequency of the pump motor 47b is increased so that the refrigerating machine oil circulating in the heat medium circuit 11 is increased. The flow rate can be increased to reliably promote cooling of the refrigerant during the compression stroke.

<During heating operation>
During the heating operation, the refrigerant circulation direction switching valve 23 is set to the second refrigerant circulation state indicated by the broken line in FIG. The opening degree of the outdoor expansion valve 25 is adjusted. The heat medium cooler switching valve 44 is set to the second heat medium cooling state indicated by the broken line in FIG.

  In the state of the refrigerant circuit 10 and the heat medium circuit 11, the low-pressure refrigerant in the refrigeration cycle is sucked into the compressor 21 and compressed to a pressure higher than the critical pressure of the refrigerant by the compression element 21a, and the high-pressure in the refrigeration cycle. Is discharged as a refrigerant. The high-pressure refrigerant discharged from the compressor 21 is sent to the oil separator 22. The high-pressure refrigerant is separated from refrigerating machine oil in the oil separator 22. The high-pressure refrigerant after the refrigerating machine oil is separated is sent from the outdoor unit 2 to the indoor unit 5 through the refrigerant outlet through the refrigerant circulation direction switching valve 23 and the gas refrigerant communication pipe 7. The refrigerant sent to the indoor unit 5 dissipates heat by exchanging heat with indoor air or the like as a cooling medium in the indoor heat exchanger 51. The high-pressure refrigerant radiated in the indoor exchanger 51 is sent from the indoor unit 5 to the outdoor unit 2 through the liquid refrigerant communication tube 6. The refrigerant sent to the outdoor unit 2 is decompressed by the outdoor expansion valve 25 and becomes a low-pressure gas-liquid two-phase refrigerant in the refrigeration cycle. The refrigerant having a low pressure in the outdoor expansion valve 25 is sent to the outdoor heat exchanger 24 and evaporates by exchanging heat with outdoor air as a heating medium. Further, the refrigerant in the outdoor heat exchanger 24 is heated by the refrigerating machine oil flowing in the heat medium circuit 11 in the second heat medium cooler 43, as will be described later. The low-pressure refrigerant evaporated in the outdoor heat exchanger 24 and heated in the second heat medium cooler 43 is again sucked into the compressor 21 through the refrigerant circulation direction switching valve 23.

  During such heating operation, the refrigerating machine oil separated in the oil separator 22 flows into the heat medium circuit 11 as a heat medium separated from the refrigerant circuit 10. The refrigerating machine oil that has flowed into the heat medium circuit 11 is cooled by the refrigerant in the outdoor heat exchanger 24 as a cooling source caused by the refrigerant circuit 10 in the second heat medium cooler 43, and is heated by the heat medium pump 47. The pressure is increased and sent to the compression mechanism cooler 48. The refrigerating machine oil sent to the compression mechanism cooler 48 cools the refrigerant flowing through the compressor 21 in the compression mechanism cooler 48 and then returns to the position between the compressor 21 and the oil separator 22 in the refrigerant circuit 10. It is. Thereby, in the compressor 21, the refrigerant | coolant in a compression stroke is cooled, the compression stroke in the compressor 21 comes close to isothermal compression, and compression power can be made small. In addition, as described above, the refrigerant in the outdoor heat exchanger 24 is heated by the refrigerating machine oil flowing in the heat medium circuit 11 in the second heat medium cooler 43, so that heat generated by the compression work is exchanged outdoors. That is, it is used to reduce the evaporation load in the vessel 24.

  At this time, similarly to the cooling operation, the operation capacity of the heat medium pump 47 is controlled based on the suction temperature and the discharge temperature of the compressor 21 detected by the suction temperature sensor 26 and the discharge temperature sensor 27 (here, The degree of cooling of the refrigerant during the compression stroke may be adjusted by controlling the operating frequency of the pump motor 47b. For example, when the temperature difference obtained by subtracting the suction temperature from the discharge temperature of the compressor 21 exceeds a predetermined temperature difference, the operating frequency of the pump motor 47b is increased so that the refrigerating machine oil circulating in the heat medium circuit 11 is increased. The flow rate can be increased to reliably promote cooling of the refrigerant during the compression stroke.

(3) Features of the air conditioner The air conditioner 1 of the present embodiment has the following features.

<A>
In the air conditioning apparatus 1 of the present embodiment, when the refrigerant circulation direction switching valve 23 as the refrigerant circulation direction switching mechanism is in the first refrigerant circulation state, the refrigerant compressed in the compressor 21 as the compression mechanism is mainly The refrigerant circulated in the refrigerant circuit 10 in the order of the outdoor heat exchanger 24 as the heat source side heat exchanger and the indoor heat exchanger 51 as the use side heat exchanger, and separated in the oil separator 22 as the oil separation mechanism The refrigerating machine oil as the heat medium separated from the circuit 10 is the refrigerant in the first heat medium cooler 42 because the heat medium cooler switching valve 44 as the heat medium cooler switching mechanism is in the first heat medium cooling state. After being cooled by a cooling source not derived from the circuit 10, the compression mechanism cooler 48 circulates the heat medium circuit 11 so as to cool the refrigerant flowing through the compressor 21. When the refrigerant circulation direction switching valve 23 is in the second refrigerant circulation state, the refrigerant compressed in the compressor 21 mainly passes through the refrigerant circuit 10 in the order of the indoor heat exchanger 51 and the outdoor heat exchanger 24. The refrigerating machine oil that circulates and is separated in the oil separator 22 is in the second heat medium cooler 43 because the heat medium cooler switching valve 44 is in the second heat medium cooling state. After being cooled by (here, the refrigerant in the outdoor heat exchanger 24), in the compression mechanism cooler 48, the heat medium circuit 11 is circulated so as to cool the refrigerant flowing through the compressor 21. That is, when the refrigerant circulation direction switching valve 23 is in the second refrigerant circulation state, heating capacity is required. However, as in the case where the refrigerant circulation direction switching valve 23 is in the first refrigerant circulation state, oil separation is performed. If the refrigerating machine oil separated in the cooler 22 is cooled by a cooling source that does not originate from the refrigerant circuit 10, a heat dissipation loss occurs such as simply radiating heat to the outside. However, in this air conditioner 1, the refrigerant circulation direction switching valve When 23 is a 2nd refrigerant | coolant circulation state, the refrigerating machine oil isolate | separated in the oil separator 22 can be cooled with the cooling source resulting from the refrigerant circuit 10, and it can suppress that a heat dissipation loss arises.

  Thereby, in the air conditioning apparatus 1 of this embodiment, even when the refrigerant circulation direction switching valve 23 is in the second refrigerant circulation state, the refrigerant 21 is generated by the compression work while cooling the refrigerant during the compression stroke of the compressor 21. Heat can be used effectively.

  In particular, in the air conditioner 1 of the present embodiment, the second heat medium cooler 43 uses the refrigerant in the outdoor heat exchanger 24 as a cooling source due to the refrigerant circuit 10, and thus the outdoor heat exchanger There is an advantage that the refrigerant in 24 is heated and the evaporation load in the outdoor heat exchanger 24 can be reduced.

<B>
In the air conditioner 1 of the present embodiment, since the heat medium circuit 11 is circulated so that the refrigeration oil separated in the oil separator 22 is returned between the compressor 21 and the oil separator 22, the refrigerant circuit 10 The refrigerating machine oil is less likely to be distributed in the part away from the compressor 21, and the flow rate of the refrigerating machine oil circulating through the heat medium circuit 11 is stabilized, whereby a stable cooling capacity of the compression mechanism cooler 48 can be obtained. .

(4) Modification 1
In the above-described embodiment, the compression mechanism cooler 48 may be incorporated in the compressor 21 as the compression mechanism.

  For example, when the compression element 21a of the compressor 21 is a scroll-type compression element, a structure as shown in FIGS. Here, FIG. 2 is a longitudinal sectional view showing the vicinity of the compression element 21a of the compressor 21 in which the compression mechanism cooler 48 is incorporated, FIG. 3 is a sectional view taken along the line II of FIG. FIG. 3 is a cross-sectional view taken along the line II-II in FIG.

  The compression element 21 a is accommodated in a casing (not shown) of the compressor 21, and mainly includes a movable scroll 61 and a fixed scroll 62 that meshes with the movable scroll 61. A heat medium flow path 64 is formed inside the end plate 61 a of the movable scroll 61 and inside the lap 61 b erected on the end plate 61 a so as to be adjacent to the compression chamber 63 formed by both the scrolls 61 and 62. A heat medium flow path 65 is also formed adjacent to the compression chamber 63 in the end plate 62 a of the fixed scroll 62 and in the lap 62 b erected on the end plate 62 a. The heat medium flow paths 64 and 65 are connected to the discharge side portion of the heat medium pump 47 of the second heat medium merging pipe 41d to constitute the compression mechanism cooler 48. Here, the heat medium flow path that constitutes the compression mechanism cooler 48 is formed in both the scrolls 61 and 62, but the scrolls 61 and 62 are formed only in the fixed scroll 62, for example. You may make it form in one side.

  Thereby, in the air conditioning apparatus 1 of this modification, the refrigerant in the compression stroke can be reliably cooled in the compression element 21a.

(5) Modification 2
In the above-described embodiment and Modification 1, the refrigerant in the compression stroke of the compressor 21 as the compression mechanism is cooled even when the refrigerant circulation direction switching valve 23 as the refrigerant circulation direction switching mechanism is in the second refrigerant circulation state. However, in order to effectively use the heat generated by the compression work, in the second heat medium cooler 43, an outdoor heat exchanger as a heat source side heat exchanger is used as a cooling source due to the refrigerant circuit 10. Although the refrigerant | coolant in 24 is used, it may replace with this and the refrigerant | coolant which flows between the outdoor heat exchanger 24 and the compressor 21 may be used.

  For example, as shown in FIG. 5, the second heat medium cooler 43 can be provided in the suction pipe 29 that connects the refrigerant circulation direction switching valve 23 and the suction side of the compressor 21.

  Next, the operation of this modification will be described with reference to FIG.

  During the cooling operation, the refrigerant circulation direction switching valve 23 is in the first refrigerant circulation state indicated by the solid line in FIG. The degree of opening of the outdoor expansion valve 25 as an expansion mechanism is adjusted. Further, the heat medium cooler switching valve 44 as the heat medium cooler switching mechanism is set to the first heat medium cooling state shown by the solid line in FIG. 5, and in the state of the refrigerant circuit 10 and the heat medium circuit 11, the above-described implementation is performed. The same operation as that of the embodiment and the modification 1 is performed (here, detailed description of the operation during the cooling operation is omitted).

  During the heating operation, the refrigerant circulation direction switching valve 23 is in the second refrigerant circulation state indicated by the broken line in FIG. The opening degree of the outdoor expansion valve 25 is adjusted. The heat medium cooler switching valve 44 is set to the second heat medium cooling state indicated by a broken line in FIG.

  In the state of the refrigerant circuit 10 and the heat medium circuit 11, the low-pressure refrigerant in the refrigeration cycle is sucked into the compressor 21 and compressed to a pressure higher than the critical pressure of the refrigerant by the compression element 21a, and the high-pressure in the refrigeration cycle. Is discharged as a refrigerant. The high-pressure refrigerant discharged from the compressor 21 is sent to the oil separator 22. The high-pressure refrigerant is separated from refrigerating machine oil in the oil separator 22. The high-pressure refrigerant after the refrigerating machine oil is separated is sent from the outdoor unit 2 to the indoor unit 5 through the refrigerant outlet through the refrigerant circulation direction switching valve 23 and the gas refrigerant communication pipe 7. The refrigerant sent to the indoor unit 5 dissipates heat by exchanging heat with indoor air or the like as a cooling medium in the indoor heat exchanger 51. The high-pressure refrigerant radiated in the indoor exchanger 51 is sent from the indoor unit 5 to the outdoor unit 2 through the liquid refrigerant communication tube 6. The refrigerant sent to the outdoor unit 2 is decompressed by the outdoor expansion valve 25 and becomes a low-pressure gas-liquid two-phase refrigerant in the refrigeration cycle. The refrigerant having a low pressure in the outdoor expansion valve 25 is sent to the outdoor heat exchanger 24 and evaporates by exchanging heat with outdoor air as a heating medium. The low-pressure refrigerant evaporated in the outdoor heat exchanger 24 is sent to the suction pipe 29 through the refrigerant circulation direction switching valve 23, heated in the second heat medium cooler 43, and then sucked into the compressor 21 again.

  During such heating operation, the refrigerating machine oil separated in the oil separator 22 flows into the heat medium circuit 11 as a heat medium separated from the refrigerant circuit 10. The refrigerating machine oil that has flowed into the heat medium circuit 11 is cooled by the refrigerant flowing between the outdoor heat exchanger 24 and the compressor 21 as a cooling source caused by the refrigerant circuit 10 in the second heat medium cooler 43. The pressure is raised by the heat medium pump 47 and sent to the compression mechanism cooler 48. The refrigerating machine oil sent to the compression mechanism cooler 48 cools the refrigerant flowing through the compressor 21 in the compression mechanism cooler 48 and then returns to the position between the compressor 21 and the oil separator 22 in the refrigerant circuit 10. It is. Thereby, in the compressor 21, the refrigerant | coolant in a compression stroke is cooled, the compression stroke in the compressor 21 comes close to isothermal compression, and compression power can be made small.

  As described above, in the air conditioner 1 of the present modified example, when the refrigerant circulation direction switching valve 23 is in the second refrigerant circulation state, the heating capability is required as in the above-described embodiment and the first modified example. As in the case where the refrigerant circulation direction switching valve 23 is in the first refrigerant circulation state, when the refrigerating machine oil separated in the oil separator 22 is cooled by a cooling source not derived from the refrigerant circuit 10, it simply radiates heat to the outside. However, in this air conditioner 1, when the refrigerant circulation direction switching valve 23 is in the second refrigerant circulation state, the refrigerating machine oil separated in the oil separator 22 is used as the refrigerant circuit. 10 is cooled by a cooling source (here, the refrigerant flowing between the outdoor heat exchanger 24 and the compressor 21), and heat radiation loss can be suppressed. First Even if a refrigerant circulation state, while cooling the refrigerant in the compression stroke of the compressor 21, it is possible to effectively utilize the heat generated by the compression work.

(6) Modification 3
In the above-described embodiment and Modification 1, the refrigerant in the compression stroke of the compressor 21 as the compression mechanism is cooled even when the refrigerant circulation direction switching valve 23 as the refrigerant circulation direction switching mechanism is in the second refrigerant circulation state. However, in order to effectively use the heat generated by the compression work, in the second heat medium cooler 43, an outdoor heat exchanger as a heat source side heat exchanger is used as a cooling source due to the refrigerant circuit 10. However, instead of this, drain water generated in the outdoor heat exchanger 24 (that is, in the outdoor air during the heat exchange between the outdoor air and the refrigerant in the outdoor heat exchanger 24). (Drain water generated by condensation of water) may be used.

  For example, as shown in FIG. 6, the second heat medium cooler 43 is provided integrally with the lower part of the outdoor heat exchanger 24, or provided in the drain pan 30 that receives drain water generated in the outdoor heat exchanger 24. The drain water generated in the outdoor heat exchanger 24 can be supplied.

  Next, the operation of this modification will be described with reference to FIG.

  During the cooling operation, the refrigerant circulation direction switching valve 23 is in the first refrigerant circulation state indicated by the solid line in FIG. The degree of opening of the outdoor expansion valve 25 as an expansion mechanism is adjusted. Further, the heat medium cooler switching valve 44 as the heat medium cooler switching mechanism is set to the first heat medium cooling state shown by the solid line in FIG. 6, and in the state of the refrigerant circuit 10 and the heat medium circuit 11, the above-described implementation is performed. The same operation as that of the embodiment and the modification 1 is performed (here, detailed description of the operation during the cooling operation is omitted).

  During the heating operation, the refrigerant circulation direction switching valve 23 is in the second refrigerant circulation state indicated by the broken line in FIG. The opening degree of the outdoor expansion valve 25 is adjusted. The heat medium cooler switching valve 44 is set to the second heat medium cooling state indicated by the broken line in FIG.

  In the state of the refrigerant circuit 10 and the heat medium circuit 11, the low-pressure refrigerant in the refrigeration cycle is sucked into the compressor 21 and compressed to a pressure higher than the critical pressure of the refrigerant by the compression element 21a, and the high-pressure in the refrigeration cycle. Is discharged as a refrigerant. The high-pressure refrigerant discharged from the compressor 21 is sent to the oil separator 22. The high-pressure refrigerant is separated from refrigerating machine oil in the oil separator 22. The high-pressure refrigerant after the refrigerating machine oil is separated is sent from the outdoor unit 2 to the indoor unit 5 through the refrigerant outlet through the refrigerant circulation direction switching valve 23 and the gas refrigerant communication pipe 7. The refrigerant sent to the indoor unit 5 dissipates heat by exchanging heat with indoor air or the like as a cooling medium in the indoor heat exchanger 51. The high-pressure refrigerant radiated in the indoor exchanger 51 is sent from the indoor unit 5 to the outdoor unit 2 through the liquid refrigerant communication tube 6. The refrigerant sent to the outdoor unit 2 is decompressed by the outdoor expansion valve 25 and becomes a low-pressure gas-liquid two-phase refrigerant in the refrigeration cycle. The refrigerant having a low pressure in the outdoor expansion valve 25 is sent to the outdoor heat exchanger 24 and evaporates by exchanging heat with outdoor air as a heating medium. The low-pressure refrigerant evaporated in the outdoor heat exchanger 24 is again sucked into the compressor 21 through the refrigerant circulation direction switching valve 23.

  During such heating operation, the refrigerating machine oil separated in the oil separator 22 flows into the heat medium circuit 11 as a heat medium separated from the refrigerant circuit 10. The refrigerating machine oil that has flowed into the heat medium circuit 11 is cooled in the second heat medium cooler 43 by drain water generated in the outdoor heat exchanger 24 as a cooling source caused by the refrigerant circuit 10, and the heat medium pump The pressure is increased by 47 and sent to the compression mechanism cooler 48. The refrigerating machine oil sent to the compression mechanism cooler 48 cools the refrigerant flowing through the compressor 21 in the compression mechanism cooler 48 and then returns to the position between the compressor 21 and the oil separator 22 in the refrigerant circuit 10. It is. Thereby, in the compressor 21, the refrigerant | coolant in a compression stroke is cooled, the compression stroke in the compressor 21 comes close to isothermal compression, and compression power can be made small. Moreover, since the drain water generated in the outdoor heat exchanger 24 is heated by the refrigeration oil flowing in the heat medium circuit 11 in the second heat medium cooler 43, the heat generated by the compression work is converted to the outdoor heat exchanger 24. In addition, the drain water in the drain pan 30 is used for preventing freezing of water and suppressing crystal growth.

  As described above, in the air conditioner 1 of the present modified example, when the refrigerant circulation direction switching valve 23 is in the second refrigerant circulation state, the heating capability is required as in the above-described embodiment and the first modified example. As in the case where the refrigerant circulation direction switching valve 23 is in the first refrigerant circulation state, when the refrigerating machine oil separated in the oil separator 22 is cooled by a cooling source not derived from the refrigerant circuit 10, it simply radiates heat to the outside. However, in this air conditioner 1, when the refrigerant circulation direction switching valve 23 is in the second refrigerant circulation state, the refrigerating machine oil separated in the oil separator 22 is used as the refrigerant circuit. 10 is cooled by a cooling source (here, drain water generated in the outdoor heat exchanger 24), and heat dissipation loss can be suppressed, whereby the refrigerant circulation direction switching valve 23 can be In case of a circulation state also, while cooling the refrigerant in the compression stroke of the compressor 21, it is possible to effectively utilize the heat generated by the compression work. In particular, in the air conditioner 1 of the present modification, the second heat medium cooler 43 uses the drain water generated in the outdoor heat exchanger 24 as a cooling source caused by the refrigerant circuit 10, and thus is heated. In addition, there is an advantage that the drain water can be prevented from freezing and crystal growth in the outdoor heat exchanger 24 and the drain pan 30 by the heat of the drain water.

(7) Modification 4
In the above-described embodiment and Modification 1, the refrigerant in the compression stroke of the compressor 21 as the compression mechanism is cooled even when the refrigerant circulation direction switching valve 23 as the refrigerant circulation direction switching mechanism is in the second refrigerant circulation state. However, in order to effectively use the heat generated by the compression work, in the second heat medium cooler 43, an outdoor heat exchanger as a heat source side heat exchanger is used as a cooling source due to the refrigerant circuit 10. Although the refrigerant | coolant in 24 is used, it may replace with this and may use a thermal storage material.

  For example, as FIG. 7 shows, the 2nd heat carrier cooler 43 can be used as the heat exchanger which cools refrigeration oil with the thermal storage material 43a. The second heat medium cooler 43 is a refrigerant that flows between the outdoor heat exchanger 24 and the compressor 21 by heat stored in the heat storage material 43a (here, the refrigerant circulation direction switching valve 23 and the suction of the compressor 21). The refrigerant flowing through the suction pipe 29 connecting the side) can be heated. That is, in the second heat medium cooler 43, the heat storage material 43a is interposed between the flow path through which the refrigeration oil flowing through the second heat medium branch pipe 41c passes and the flow path through which the refrigerant flowing through the suction pipe 29 passes. It has a structure. The suction pipe 29 is provided with a bypass refrigerant pipe 31 that bypasses the second heat medium cooler 43. The bypass refrigerant pipe 31 is provided with a bypass valve 32 that controls the inflow of the refrigerant into the bypass refrigerant pipe 31, and the suction pipe 29 has a refrigerant flow to the second heat medium cooler 43. A defrost valve 33 for controlling the inflow is provided.

  Next, the operation of this modification will be described with reference to FIG.

  During the cooling operation, the refrigerant circulation direction switching valve 23 is in the first refrigerant circulation state indicated by the solid line in FIG. The degree of opening of the outdoor expansion valve 25 as an expansion mechanism is adjusted. Further, the heat medium cooler switching valve 44 as the heat medium cooler switching mechanism is set to the first heat medium cooling state shown by the solid line in FIG. 7, and in the state of the refrigerant circuit 10 and the heat medium circuit 11, the above-described implementation is performed. The same operation as that of the embodiment and the modification 1 is performed (here, detailed description of the operation during the cooling operation is omitted).

  During the heating operation, the refrigerant circulation direction switching valve 23 is set to the second refrigerant circulation state indicated by a broken line in FIG. The opening degree of the outdoor expansion valve 25 is adjusted. The heat medium cooler switching valve 44 is set to the second heat medium cooling state indicated by the broken line in FIG. Further, the bypass valve 32 is opened, and the defrost valve 33 is closed, so that heat exchange between the refrigerant flowing through the suction pipe 29 and the heat storage material 43a is not performed.

  In the state of the refrigerant circuit 10 and the heat medium circuit 11, the low-pressure refrigerant in the refrigeration cycle is sucked into the compressor 21 and compressed to a pressure higher than the critical pressure of the refrigerant by the compression element 21a, and the high-pressure in the refrigeration cycle. Is discharged as a refrigerant. The high-pressure refrigerant discharged from the compressor 21 is sent to the oil separator 22. The high-pressure refrigerant is separated from refrigerating machine oil in the oil separator 22. The high-pressure refrigerant after the refrigerating machine oil is separated is sent from the outdoor unit 2 to the indoor unit 5 through the refrigerant outlet through the refrigerant circulation direction switching valve 23 and the gas refrigerant communication pipe 7. The refrigerant sent to the indoor unit 5 dissipates heat by exchanging heat with indoor air or the like as a cooling medium in the indoor heat exchanger 51. The high-pressure refrigerant radiated in the indoor exchanger 51 is sent from the indoor unit 5 to the outdoor unit 2 through the liquid refrigerant communication tube 6. The refrigerant sent to the outdoor unit 2 is decompressed by the outdoor expansion valve 25 and becomes a low-pressure gas-liquid two-phase refrigerant in the refrigeration cycle. The refrigerant having a low pressure in the outdoor expansion valve 25 is sent to the outdoor heat exchanger 24 and evaporates by exchanging heat with outdoor air as a heating medium. The low-pressure refrigerant evaporated in the outdoor heat exchanger 24 is again sucked into the compressor 21 through the refrigerant circulation direction switching valve 23 and the bypass refrigerant pipe 31.

  During such heating operation, the refrigerating machine oil separated in the oil separator 22 flows into the heat medium circuit 11 as a heat medium separated from the refrigerant circuit 10. The refrigerating machine oil that has flowed into the heat medium circuit 11 is cooled by the heat storage material 43a as a cooling source caused by the refrigerant circuit 10 in the second heat medium cooler 43, and is pressurized by the heat medium pump 47 to be compressed. It is sent to the mechanism cooler 48. The refrigerating machine oil sent to the compression mechanism cooler 48 cools the refrigerant flowing through the compressor 21 in the compression mechanism cooler 48 and then returns to the position between the compressor 21 and the oil separator 22 in the refrigerant circuit 10. It is. Thereby, in the compressor 21, the refrigerant | coolant in a compression stroke is cooled, the compression stroke in the compressor 21 comes close to isothermal compression, and compression power can be made small. Moreover, since the heat storage material 43a of the second heat medium cooler 43 is heated by the refrigerating machine oil flowing in the heat medium circuit 11, the heat generated by the compression work is stored, and the defrosting of the outdoor heat exchanger 24 is performed. It will be used as a heat source. Specifically, when frost formation of the outdoor heat exchanger 24 occurs, the operation similar to the cooling operation is performed by temporarily switching the refrigerant circulation direction switching valve 23 to the first refrigerant circulation state, The high-temperature and high-pressure refrigerant discharged from the compressor 21 is passed through the outdoor heat exchanger 24 to perform the defrosting operation. At this time, the bypass valve 32 is closed and the defrost valve 33 is opened. By heating the refrigerant flowing through the suction pipe 29 with the heat storage material 43a, the temperature of the refrigerant discharged from the compressor 21 can be made as high as possible, and the defrosting of the outdoor heat exchanger 24 can be promoted.

  As described above, in the air conditioner 1 of the present modified example, when the refrigerant circulation direction switching valve 23 is in the second refrigerant circulation state, the heating capability is required as in the above-described embodiment and the first modified example. As in the case where the refrigerant circulation direction switching valve 23 is in the first refrigerant circulation state, when the refrigerating machine oil separated in the oil separator 22 is cooled by a cooling source not derived from the refrigerant circuit 10, it simply radiates heat to the outside. However, in this air conditioner 1, when the refrigerant circulation direction switching valve 23 is in the second refrigerant circulation state, the refrigerating machine oil separated in the oil separator 22 is used as the refrigerant circuit. 10 is cooled by the cooling source (here, the heat storage material 43a) due to 10, and it is possible to suppress the occurrence of a heat dissipation loss, whereby the refrigerant circulation direction switching valve 23 is in the second refrigerant circulation state. , While cooling the refrigerant in the compression stroke of the compressor 21, it is possible to effectively utilize the heat generated by the compression work. In particular, in the air conditioner 1 of the present modification, the heat storage material 43a is used as a cooling source due to the refrigerant circuit 10, and therefore the defrosting of the outdoor heat exchanger 24 is performed by the heat stored in the heat storage material 43a. There is an advantage that it can be used as a heat source for the use.

(8) Modification 5
In the above-described embodiment and Modification 1, the heat medium separated from the refrigerant circuit 10 such as the refrigeration oil separated in the oil separation mechanism 22 is used as the cooling source of the compression mechanism cooler 48. Instead of this, a heat medium different from the refrigerant flowing through the refrigerant circuit 10 may be used.

  For example, as shown in FIG. 8, instead of the heat medium circuit 11 connected to the refrigerant circuit 10 in the above-described embodiment, the heat composed of a closed circuit in which a heat medium different from the refrigerant flowing in the refrigerant circuit 10 circulates. A media circuit 111 can be employed. The heat medium circuit 111 is not connected to the refrigerant circuit 10, and the heat medium pipe 41e is a second heat medium branch pipe 41c (here, the second heat medium cooler 43 of the second heat medium branch pipe 41c). And the heat medium circuit 11 of the first modification and the modification 1 except that the heat medium circuit 11 is connected to the second check valve 46). Since the heat medium circuit 111 is an independent closed circuit that is not connected to the refrigerant circuit 10, various media such as refrigerant, oil, water, and the like can be used as the heat medium. It is. In this modification, the oil outlet of the oil separator 22 is connected to the suction side of the compressor 21 through the capillary tube 34.

  In such an air conditioner 1 of this modification, unlike the above-described embodiment and Modification 1, there is a difference that the heat medium circulates in the heat medium circuit 111 independently of the refrigerant circuit 10, During the cooling operation (that is, when the refrigerant circulation direction switching valve 23 as the refrigerant circulation direction switching mechanism is in the first refrigerant circulation state), the heat medium is the heat medium cooler switching valve as the heat medium cooler switching mechanism. 44 is in the first heat medium cooling state, and in the first heat medium cooler 42, the refrigerant flowing through the compressor 21 is cooled in the compression mechanism cooler 48 after being cooled by a cooling source not caused by the refrigerant circuit 10. In the heating operation (that is, when the refrigerant circulation direction switching valve 23 is in the second refrigerant circulation state), the heat medium is transferred from the heat medium cooler switching valve 44. First In the second heat medium cooler 43, after being cooled by a cooling source (here, the refrigerant in the outdoor heat exchanger 24) in the second heat medium cooler 43, in the second heat medium cooler 43, in the compression mechanism cooler 48 Then, the heat medium circuit 11 is circulated so as to cool the refrigerant flowing through the compressor 21.

  Thereby, in the air conditioning apparatus 1 of the present modification, as in the above-described embodiment and Modification 1, even when the refrigerant circulation direction switching valve 23 is in the second refrigerant circulation state, the compressor 21 is in the compression stroke. The heat generated by the compression work can be used effectively while cooling the refrigerant. Moreover, in the air conditioner 1 of the present modification, the heat medium circuit 111 is a closed circuit in which a heat medium different from the refrigerant flowing in the refrigerant circuit 10 circulates, so the flow rate of the heat medium circulating in the heat medium circuit 111 is It is possible to obtain a stable cooling capacity of the compression mechanism cooler 48.

(9) Modification 6
In the second modification described above, a heat medium separated from the refrigerant circuit 10 such as the refrigeration oil separated in the oil separation mechanism 22 is used as a cooling source for the compression mechanism cooler 48. A heat medium different from the refrigerant flowing through the refrigerant circuit 10 may be used.

  For example, as shown in FIG. 9, instead of the heat medium circuit 11 connected to the refrigerant circuit 10 in the above-described modification 2, the circuit includes a closed circuit in which a heat medium different from the refrigerant flowing in the refrigerant circuit 10 circulates. The heat medium circuit 111 can be employed. The heat medium circuit 111 is not connected to the refrigerant circuit 10, and the heat medium pipe 41e is a second heat medium branch pipe 41c (here, the second heat medium cooler 43 of the second heat medium branch pipe 41c). And the second check valve 46), except for being connected to the second check valve 46). Since the heat medium circuit 111 is an independent closed circuit that is not connected to the refrigerant circuit 10, various media such as refrigerant, oil, water, and the like can be used as the heat medium. It is. In this modification, the oil outlet of the oil separator 22 is connected to the suction side of the compressor 21 through the capillary tube 34.

  In the air conditioner 1 of this modification example, unlike the modification example 2 described above, although there is a difference that the heat medium circulates in the heat medium circuit 111 independently of the refrigerant circuit 10, the air conditioner 1 is in the cooling operation. In other words, when the refrigerant circulation direction switching valve 23 as the refrigerant circulation direction switching mechanism is in the first refrigerant circulation state, the heat medium is switched by the heat medium cooler switching valve 44 as the heat medium cooler switching mechanism. Since the first heat medium cooling state is set, the first heat medium cooler 42 is cooled by a cooling source not caused by the refrigerant circuit 10, and then the refrigerant flowing through the compressor 21 is cooled in the compression mechanism cooler 48. During the heating operation (that is, when the refrigerant circulation direction switching valve 23 is in the second refrigerant circulation state), the heat medium is circulated through the heat medium circuit 111, and the heat medium cooler switching valve 44 is second heat. Medium cooling Therefore, in the second heat medium cooler 43, after being cooled by a cooling source (here, the refrigerant flowing between the outdoor heat exchanger 24 and the compressor 21) caused by the refrigerant circuit 10, the cooling of the compression mechanism is performed. In the vessel 48, the heat medium circuit 11 is circulated so as to cool the refrigerant flowing through the compressor 21.

  Thereby, in the air conditioning apparatus 1 of this modification, similarly to the above-described modification 2, the refrigerant during the compression stroke of the compressor 21 can be obtained even when the refrigerant circulation direction switching valve 23 is in the second refrigerant circulation state. While cooling, the heat generated by the compression work can be used effectively. Moreover, in the air conditioner 1 of the present modification, the heat medium circuit 111 is a closed circuit in which a heat medium different from the refrigerant flowing in the refrigerant circuit 10 circulates, so the flow rate of the heat medium circulating in the heat medium circuit 111 is It is possible to obtain a stable cooling capacity of the compression mechanism cooler 48.

(10) Modification 7
In the above-described modification 3, the heat medium separated from the refrigerant circuit 10 such as the refrigeration oil separated in the oil separation mechanism 22 is used as the cooling source of the compression mechanism cooler 48. A heat medium different from the refrigerant flowing through the refrigerant circuit 10 may be used.

  For example, as shown in FIG. 10, instead of the heat medium circuit 11 connected to the refrigerant circuit 10 in Modification 3 described above, a closed circuit in which a heat medium different from the refrigerant flowing in the refrigerant circuit 10 circulates is formed. The heat medium circuit 111 can be employed. The heat medium circuit 111 is not connected to the refrigerant circuit 10, and the heat medium pipe 41e is a second heat medium branch pipe 41c (here, the second heat medium cooler 43 of the second heat medium branch pipe 41c). And the second check valve 46), the heat medium circuit 11 has the same configuration as that of the heat medium circuit 11 of the third modification described above. Since the heat medium circuit 111 is an independent closed circuit that is not connected to the refrigerant circuit 10, various media such as refrigerant, oil, water, and the like can be used as the heat medium. It is. In this modification, the oil outlet of the oil separator 22 is connected to the suction side of the compressor 21 through the capillary tube 34.

  In the air conditioning apparatus 1 of this modification example, unlike the modification example 3 described above, although there is a difference that the heat medium circulates in the heat medium circuit 111 independently of the refrigerant circuit 10, In other words, when the refrigerant circulation direction switching valve 23 as the refrigerant circulation direction switching mechanism is in the first refrigerant circulation state, the heat medium is switched by the heat medium cooler switching valve 44 as the heat medium cooler switching mechanism. Since the first heat medium cooling state is set, the first heat medium cooler 42 is cooled by a cooling source not caused by the refrigerant circuit 10, and then the refrigerant flowing through the compressor 21 is cooled in the compression mechanism cooler 48. During the heating operation (that is, when the refrigerant circulation direction switching valve 23 is in the second refrigerant circulation state), the heat medium is circulated through the heat medium circuit 111, and the heat medium cooler switching valve 44 is second heat. Medium cooling Therefore, in the second heat medium cooler 43, after being cooled by a cooling source (here, drain water generated in the outdoor heat exchanger 24) caused by the refrigerant circuit 10, in the compression mechanism cooler 48, The heat medium circuit 11 is circulated so as to cool the refrigerant flowing through the compressor 21.

  Thereby, in the air conditioning apparatus 1 of this modification, similarly to the above-described modification 3, the refrigerant in the compression stroke of the compressor 21 is discharged even when the refrigerant circulation direction switching valve 23 is in the second refrigerant circulation state. While cooling, the heat generated by the compression work can be used effectively. Moreover, in the air conditioner 1 of the present modification, the heat medium circuit 111 is a closed circuit in which a heat medium different from the refrigerant flowing in the refrigerant circuit 10 circulates, so the flow rate of the heat medium circulating in the heat medium circuit 111 is It is possible to obtain a stable cooling capacity of the compression mechanism cooler 48.

(11) Modification 8
In the above-described modification 4, the heat medium separated from the refrigerant circuit 10 such as the refrigerating machine oil separated in the oil separation mechanism 22 is used as the cooling source of the compression mechanism cooler 48. A heat medium different from the refrigerant flowing through the refrigerant circuit 10 may be used.

  For example, as shown in FIG. 11, instead of the heat medium circuit 11 connected to the refrigerant circuit 10 in the above-described modification 4, the circuit includes a closed circuit in which a heat medium different from the refrigerant flowing in the refrigerant circuit 10 circulates. The heat medium circuit 111 can be employed. The heat medium circuit 111 is not connected to the refrigerant circuit 10, and the heat medium pipe 41e is a second heat medium branch pipe 41c (here, the second heat medium cooler 43 of the second heat medium branch pipe 41c). And the second check valve 46), except for being connected to the second check valve 46). Since the heat medium circuit 111 is an independent closed circuit that is not connected to the refrigerant circuit 10, various media such as refrigerant, oil, water, and the like can be used as the heat medium. It is. In this modification, the oil outlet of the oil separator 22 is connected to the suction side of the compressor 21 through the capillary tube 34.

  In the air conditioner 1 of this modification example, unlike the modification example 4 described above, although there is a difference that the heat medium circulates in the heat medium circuit 111 independently of the refrigerant circuit 10, In other words, when the refrigerant circulation direction switching valve 23 as the refrigerant circulation direction switching mechanism is in the first refrigerant circulation state, the heat medium is switched by the heat medium cooler switching valve 44 as the heat medium cooler switching mechanism. Since the first heat medium cooling state is set, the first heat medium cooler 42 is cooled by a cooling source not caused by the refrigerant circuit 10, and then the refrigerant flowing through the compressor 21 is cooled in the compression mechanism cooler 48. During the heating operation (that is, when the refrigerant circulation direction switching valve 23 is in the second refrigerant circulation state), the heat medium is circulated through the heat medium circuit 111, and the heat medium cooler switching valve 44 is second heat. Medium cooling Therefore, in the second heat medium cooler 43, the refrigerant flowing through the compressor 21 is cooled in the compression mechanism cooler 48 after being cooled by the cooling source (here, the heat storage material 43a) caused by the refrigerant circuit 10. The heat medium circuit 11 is circulated so as to be cooled.

  Thereby, in the air conditioning apparatus 1 of this modification, similarly to the above-described modification 4, even when the refrigerant circulation direction switching valve 23 is in the second refrigerant circulation state, the refrigerant in the compression stroke of the compressor 21 is removed. While cooling, the heat generated by the compression work can be used effectively. Moreover, in the air conditioner 1 of the present modification, the heat medium circuit 111 is a closed circuit in which a heat medium different from the refrigerant flowing in the refrigerant circuit 10 circulates, so the flow rate of the heat medium circulating in the heat medium circuit 111 is It is possible to obtain a stable cooling capacity of the compression mechanism cooler 48.

(12) Other Embodiments Although the embodiments of the present invention and the modifications thereof have been described with reference to the drawings, the specific configuration is not limited to these embodiments and the modifications thereof. Changes can be made without departing from the scope of the invention.

<A>
In the above-described embodiment and its modification, the number of indoor units 5 is one, but a plurality of units may be used.

<B>
In the first modification described above, the compressor 21 is a scroll type compressor. However, the compressor 21 is not limited to this, and may be another type of compressor such as a rotary type. Moreover, in the above-mentioned embodiment and its modification, the one compressor 21 is provided, However, Two or more compressors may be connected in parallel.

<C>
In the above-described embodiment and its modification, a four-way switching valve is employed as the refrigerant circulation direction switching valve 23 and the oil cooler switching valve 45. However, the refrigerant circulation direction switching valve 23 can be obtained by combining a plurality of electromagnetic valves and the like. Alternatively, the same function as that of the oil cooler switching valve 45 may be obtained. Further, a three-way valve or the like may be employed instead of the bypass valve 32 and the defrost valve 33 in the modified example 13 of the first embodiment described above.

<D>
In the above-described embodiment and its modification, the heat medium circuit 11 including the compression mechanism cooler 48 and the like is provided for the air conditioner 1 including the refrigerant circuit 10 including the compressor 21 as a single-stage compression type compression mechanism. However, the present invention is not limited to this, and a compression mechanism cooler or the like is provided for an air conditioner including a refrigerant circuit having a compressor as a multistage compression type compression mechanism such as a two-stage compression type. A heat medium circuit may be provided.

  By utilizing the present invention, in a refrigeration apparatus having a refrigerant circuit capable of switching the refrigerant circulation direction, while cooling the refrigerant during the compression stroke of the compression mechanism, even in the refrigerant circulation state where heating capacity is required, The heat generated by the compression work can be used effectively.

It is a schematic block diagram of the air conditioning apparatus as 1st Embodiment of the freezing apparatus concerning this invention. It is a longitudinal cross-sectional view which shows the compression element vicinity of the compressor in which the compression mechanism cooler concerning the modification 1 was integrated. It is II sectional drawing of FIG. It is II-II sectional drawing of FIG. It is a schematic block diagram of the air conditioning apparatus concerning the modification 2. It is a schematic block diagram of the air conditioning apparatus concerning the modification 3. It is a schematic block diagram of the air conditioning apparatus concerning the modification 4. It is a schematic block diagram of the air conditioning apparatus concerning the modification 5. It is a schematic block diagram of the air conditioning apparatus concerning the modification 6. It is a schematic block diagram of the air conditioning apparatus concerning the modification 7. It is a schematic block diagram of the air conditioning apparatus concerning the modification 8.

Explanation of symbols

1 Air conditioning equipment (refrigeration equipment)
10 Refrigerant circuit 11, 111 Heat medium circuit 21 Compressor (compression mechanism)
22 Oil separator (oil separation mechanism)
23 Refrigerant circulation direction switching valve (refrigerant circulation direction switching mechanism)
24 Outdoor heat exchanger (heat source side heat exchanger)
42 1st heat medium cooler 43 2nd heat medium cooler 43a Heat storage material 44 Heat medium cooler switching valve (heat medium cooler switching mechanism)
48 Compression mechanism cooler 51 Indoor heat exchanger (use side heat exchanger)

Claims (9)

The compression mechanism (21) for compressing the refrigerant, the heat source side heat exchanger (24), the use side heat exchanger (51), and the heat source side heat exchanger perform heat dissipation of the refrigerant compressed in the compression mechanism. A first refrigerant circulating state that functions as a radiator and functions as an evaporator that evaporates the refrigerant that has radiated heat in the heat source side heat exchanger and the usage side heat exchanger are compressed in the compression mechanism. A refrigerant circulation direction switching mechanism that switches between a second refrigerant circulation state that functions as a radiator that radiates the refrigerant and that causes the heat source side heat exchanger to function as an evaporator that evaporates the refrigerant that has radiated heat in the use side heat exchanger. A refrigerant circuit (10) having (23);
A first heat medium cooler (42) for cooling a heat medium separated from the refrigerant circuit or a heat medium different from the refrigerant flowing in the refrigerant circuit by a cooling source not originating from the refrigerant circuit; and A second heat medium cooler (43) that cools by a cooling source originating from the refrigerant circuit; a first heat medium cooling state that uses the first heat medium cooler when the first refrigerant circulation state; A heat medium cooler switching mechanism (44) for switching between the second heat medium cooler using the second heat medium cooler when the two refrigerant circulation states are present, and the first heat medium cooler or the second heat A heat medium circuit (11, 111) having a compression mechanism cooler (48) for cooling the refrigerant flowing through the compression mechanism by the heat medium cooled in the medium cooler;
A refrigeration apparatus (1). The heat source side heat exchanger (24) is a heat exchanger that radiates or evaporates refrigerant by outdoor air,
The cooling source resulting from the refrigerant circuit (10) is drain water generated in the heat source side heat exchanger.
The refrigeration apparatus (1) according to claim 1.   The refrigeration apparatus (1) according to claim 1, wherein the cooling source caused by the refrigerant circuit (10) is a refrigerant in the heat source side heat exchanger (24).   The refrigeration apparatus (1) according to claim 1, wherein the cooling source resulting from the refrigerant circuit (10) is a refrigerant that flows between the heat source side heat exchanger (24) and the compression mechanism (21). The heat source side heat exchanger (24) is a heat exchanger that radiates or evaporates refrigerant by outdoor air,
The cooling source resulting from the refrigerant circuit (10) is a heat storage material (43a).
The refrigeration apparatus (1) according to claim 1. The refrigerant circuit (10) further includes an oil separation mechanism (22) that separates refrigeration oil from the refrigerant compressed in the compression mechanism (21).
The heat medium separated from the refrigerant circuit is refrigeration oil separated in the oil separation mechanism,
The refrigeration apparatus (1) according to any one of claims 1 to 5.   The heat medium is a position between the compression mechanism and the oil separation mechanism (22) in the refrigerant circuit (10) after cooling the refrigerant flowing through the compression mechanism (21) in the compression mechanism cooler (48). The refrigeration apparatus (1) according to claim 6, returned to   The refrigeration apparatus (1) according to any one of claims 1 to 5, wherein the heat medium circuit (111) is a closed circuit in which a heat medium different from the refrigerant flowing through the refrigerant circuit (10) circulates.   The refrigerant | coolant (1) in any one of Claims 1-8 whose refrigerant | coolant enclosed with the said refrigerant circuit is a carbon dioxide.

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