JP2011094931A - Air-conditioning hot water supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To immediately start an air conditioning operation in starting the air conditioning operation. <P>SOLUTION: This air-conditioning hot water supply system 1 includes a refrigerant circuit 10 configured by successively connecting a compressor 11, a hot water supply heating pipe 12 wound around a hot water supply tank 4 in which warm water for hot water supply is stored, an outdoor heat exchanger 14, an electric valve 17 as a pressure reducing mechanism, and an indoor heat exchanger 18 disposed in an air-conditioned room. When a refrigerant recovering operation is performed, an operation of the compressor 11 is started in a state that a close valve 21 at a discharge side of the compressor 11 and close valves 22, 23 at an inlet side and an outlet side of the outdoor heat exchanger 14 are closed, a first bypass circuit 30 connecting a pipe at the discharge side of the compressor 11 and a pipe at the inlet side of the outdoor heat exchanger 14 is opened, and a second bypass circuit 40 connecting the hot water supply heating pipe 12 and the close valve 22, and the indoor heat exchanger 18 and a close valve 24 at a suction side of the compressor 11 is opened. Then the close valve 24 is switched from the open state to a close state. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an air conditioning and hot water supply system that can heat hot water for hot water supply using exhaust heat when air conditioning operation is performed.

  In addition to an indoor unit and an outdoor unit for performing an air conditioning operation, an air conditioning hot water supply system including a hot water supply tank storing hot water for hot water supply is known. As this system, a compressor, a hot water supply heating pipe wound around a hot water supply tank, an outdoor heat exchanger, a pressure reducing mechanism, an indoor heat exchanger disposed in a room where air conditioning operation is performed, Have refrigerant circuits connected in order. Therefore, the refrigerant discharged from the compressor is supplied to the outdoor heat exchanger via the hot water supply heating pipe, and the hot water for hot water stored in the hot water supply tank is heated by the refrigerant flowing through the hot water supply heating pipe. The

JP 58-123075

  Here, for example, when relocating an air conditioning hot water supply system, it is necessary to collect the refrigerant circulating in the refrigerant circuit in the outdoor unit. However, in the conventional system, if an external refrigerant recovery machine is not used, a circuit in the hot water supply tank side (a circuit in which the refrigerant flows out of the outdoor unit and then flows into the outdoor unit via the hot water heating pipe) There is a problem that the refrigerant cannot be collected in the outdoor unit.

  Therefore, the present invention has been made to solve the above-described problems, and it is possible to recover the refrigerant in the hot water supply tank side circuit to the outdoor unit without using an external refrigerant recovery machine. An object of the present invention is to provide an air conditioning and hot water supply system that can be used.

  An air conditioning and hot water supply system according to a first aspect of the invention is disposed in an indoor unit in which air conditioning is performed, an outdoor unit having a compressor, an outdoor heat exchanger, and a pressure reducing mechanism, a hot water supply heating pipe for heating hot water for hot water supply. An air conditioning hot water supply system comprising an indoor unit having an indoor heat exchanger, the compressor, the hot water heating pipe, the outdoor heat exchanger, the pressure reducing mechanism, and the indoor heat exchanger, The refrigerant circuit is provided in the outdoor unit, and the refrigerant circuit is a circuit from the compressor to the hot water supply heating pipe in a direction from the compressor to the hot water supply heating pipe. A first valve mechanism capable of regulating the refrigerant from flowing into the outdoor unit, and a circuit provided in the outdoor unit from the hot water supply heating pipe to the outdoor heat exchanger, the outdoor heat exchanger to the hot water supply heating pipe Cool towards A second valve mechanism that can be controlled so as not to flow, and a circuit that is provided in the outdoor unit and extends from the outdoor heat exchanger to the indoor heat exchanger through the pressure reducing mechanism, and from the outdoor heat exchanger to the indoor heat exchanger. A third valve mechanism capable of restricting the refrigerant from flowing in a direction toward the heat exchanger; and a circuit provided in the outdoor unit and extending from the indoor heat exchanger to the compressor. A fourth valve mechanism capable of restricting the refrigerant from flowing in the direction toward the exchanger, a circuit from the compressor to the first valve mechanism, and the second valve mechanism through the outdoor heat exchanger and the second heat exchanger. A first bypass circuit connecting a circuit leading to a three-valve mechanism, a circuit extending from the first valve mechanism to the second valve mechanism via the hot water supply heating pipe, and the indoor heat exchanger from the third valve mechanism Through the circuit to the fourth valve mechanism It is characterized in that a second bypass circuit to be connected.

  In this air conditioning and hot water supply system, when recovering the refrigerant in the refrigerant circuit to the outdoor unit, the compressor is operated, and first, the refrigerant does not flow through the first valve mechanism in the direction from the compressor toward the hot water supply heating pipe. And the second valve mechanism is in a state in which the refrigerant does not flow in the direction from the outdoor heat exchanger toward the hot water supply heating pipe, and the third valve mechanism is in the direction from the outdoor heat exchanger to the indoor heat exchanger. It is assumed that it does not flow. Then, the refrigerant in the circuit on the indoor unit side (circuit extending from the third valve mechanism to the pressure reducing mechanism and the indoor heat exchanger to the fourth valve mechanism) flows toward the compressor via the fourth valve mechanism. Further, the refrigerant in the hot water heating pipe side circuit (the circuit from the first valve mechanism through the hot water heating pipe to the second valve mechanism) goes to the compressor via the second bypass circuit and the fourth valve mechanism. Flowing. In this way, the refrigerant in the circuit on the indoor unit side and the circuit on the hot water supply heating pipe side is supplied to the compressor. At this time, the refrigerant discharged from the compressor is supplied to the outdoor heat exchanger via the first bypass circuit without passing through the hot water supply heating pipe, but the third valve mechanism is connected to the indoor heat exchanger from the outdoor heat exchanger. Since the refrigerant does not flow in the direction toward the heat exchanger, the refrigerant is stored in the outdoor heat exchanger. In this state, the fourth valve mechanism is changed to a state in which the refrigerant does not flow in the direction from the compressor toward the indoor heat exchanger, whereby the refrigerant in the refrigerant circuit can be collected in the outdoor unit.

  In the first aspect of the invention, the first valve mechanism may be a circuit that extends from the compressor to the hot water supply heating pipe as long as it can restrict the refrigerant from flowing in the direction from the compressor toward the hot water supply heating pipe. Well, for example, a closing valve, a motorized valve, a check valve and the like are included. Similarly, the second valve mechanism, the third valve mechanism, and the fourth valve mechanism may be anything that can be regulated so that the refrigerant does not flow in a predetermined direction. Includes check valves.

  Further, in the first invention, for example, the circuit from the first valve mechanism to the second valve mechanism through the hot water supply heating pipe includes the first valve mechanism and the second valve mechanism arranged at both ends thereof, The circuit from the third valve mechanism through the indoor heat exchanger to the fourth valve mechanism includes a third valve mechanism and a fourth valve mechanism arranged at both ends thereof.

  An air conditioning and hot water supply system according to a second aspect of the present invention is the air conditioning and hot water supply system according to the first aspect of the invention, wherein the first bypass circuit includes a circuit extending from the compressor to the first valve mechanism, and the second valve mechanism and It is characterized by connecting to the circuit leading to the outdoor heat exchanger.

  In this air-conditioning hot water supply system, heating of hot water supply hot water stored in a hot water supply tank is completed during normal operation, and heating by the hot water supply heating pipe is no longer necessary. When the refrigerant is no longer needed, the refrigerant pressure loss can be reduced when the refrigerant discharged from the compressor is supplied directly to the outdoor heat exchanger without passing through the hot water supply heating pipe. be able to.

  An air conditioning and hot water supply system according to a third aspect of the invention is the air conditioning and hot water supply system according to the first or second aspect of the invention, wherein the second bypass circuit includes a circuit extending from the hot water supply heating pipe to the second valve mechanism, and the room A circuit from the heat exchanger to the fourth valve mechanism is connected.

  In this air conditioning and hot water supply system, one end of the second bypass circuit is not connected to the circuit from the first valve mechanism to the hot water supply heating pipe but to the circuit from the hot water supply heating pipe to the second valve mechanism. The refrigerant pressure in the circuit from the valve mechanism to the second valve mechanism through the hot water heating pipe is a circuit from the first valve mechanism to the hot water heating pipe in the circuit from the hot water heating pipe to the second valve mechanism. Since it is lower, the amount of refrigerant flowing through the second bypass circuit during the air conditioning operation can be reduced. Moreover, at the time of air-conditioning operation start-up, the refrigerant and oil in the vicinity of the hot water supply heating pipe can be quickly returned to the compressor. Further, the other end of the second bypass circuit is connected not to the circuit from the third valve mechanism to the indoor heat exchanger but to the circuit from the indoor heat exchanger to the fourth valve mechanism. Since the refrigerant recovery path to the compressor via the 2 bypass circuit is shortened, the refrigerant in the vicinity of the hot water supply heating pipe can be quickly recovered by the compressor during the refrigerant recovery operation. Further, the state of the refrigerant supplied to the compressor can be brought closer to the overheated state from the wet state.

  An air conditioning and hot water supply system according to a fourth aspect of the present invention is the air conditioning and hot water supply system according to any one of the first to third aspects of the invention, wherein the first bypass circuit and the second bypass circuit are each configured to be openable and closable. It is characterized by that.

  In this air conditioning and hot water supply system, since the first bypass circuit and the second bypass circuit are configured to be openable and closable, the first bypass circuit and the second bypass circuit can be used only during the refrigerant recovery operation. In addition, during normal operation, when the boiling of hot water for hot water stored in the hot water tank is completed, heating by the hot water heating pipe is no longer necessary, and supply of refrigerant to the hot water heating pipe is no longer necessary. When the first bypass circuit is switched to the open state, the refrigerant discharged from the compressor can be directly supplied to the outdoor heat exchanger without passing through the hot water supply heating pipe, thereby improving the air conditioning operation capacity. be able to. Further, during normal operation, it is possible to reduce the flow of refrigerant through the second bypass circuit from the hot water supply heating pipe toward the fourth valve mechanism, so that the air conditioning operation capability can be improved.

  An air conditioning and hot water supply system according to a fifth aspect of the present invention is the air conditioning and hot water supply system according to any one of the first to fourth aspects of the invention, wherein the second bypass circuit is configured by a capillary tube.

  In this air conditioning and hot water supply system, since the second bypass circuit is composed of a capillary tube, the space for installing the second bypass circuit can be reduced, and an electric valve is provided in the second bypass circuit to switch to the closed state. Even without this, normal operation can be performed.

  An air conditioning and hot water supply system according to a sixth aspect of the present invention is the air conditioning and hot water supply system according to any one of the first to fifth aspects, wherein at least one of the first bypass circuit and the second bypass circuit is connected to the refrigerant circuit. It is configured to be detachable.

  In this air conditioning and hot water supply system, the first bypass circuit and the second bypass circuit are configured as service hoses that are separate parts, and are configured to be detachable from the refrigerant circuit. The number of parts can be reduced and the manufacturing cost can be reduced. Further, by providing an electric valve or the like in the second bypass circuit and controlling the electric valve or the like, the control of the air conditioning and hot water supply system can be simplified as compared with the case where the second bypass circuit is switched to the open state or the closed state. .

  An air conditioning and hot water supply system according to a seventh aspect of the present invention is the air conditioning and hot water supply system according to any one of the first to sixth aspects of the invention, wherein the hot water supply heating pipe is a pipe that contacts a hot water supply tank storing hot water for hot water supply or the above It is characterized by being a pipe arranged in a hot water supply tank.

  This air conditioning and hot water supply system can heat hot water for hot water stored in a hot water supply tank.

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

  In the first invention, when recovering the refrigerant in the refrigerant circuit to the outdoor unit, the compressor is operated, and first, the refrigerant does not flow through the first valve mechanism in the direction from the compressor toward the hot water supply heating pipe. And the second valve mechanism is in a state in which the refrigerant does not flow in the direction from the outdoor heat exchanger toward the hot water supply heating pipe, and the third valve mechanism is in the direction in which the refrigerant flows from the outdoor heat exchanger toward the indoor heat exchanger. It is assumed that it does not flow. Then, the refrigerant in the circuit on the indoor unit side (circuit extending from the third valve mechanism to the pressure reducing mechanism and the indoor heat exchanger to the fourth valve mechanism) flows toward the compressor via the fourth valve mechanism. Further, the refrigerant in the hot water heating pipe side circuit (the circuit from the first valve mechanism through the hot water heating pipe to the second valve mechanism) goes to the compressor via the second bypass circuit and the fourth valve mechanism. Flowing. In this way, the refrigerant in the circuit on the indoor unit side and the circuit on the hot water supply heating pipe side is supplied to the compressor. At this time, the refrigerant discharged from the compressor is supplied to the outdoor heat exchanger via the first bypass circuit without passing through the hot water supply heating pipe, but the third valve mechanism is connected to the indoor heat exchanger from the outdoor heat exchanger. Since the refrigerant does not flow in the direction toward the heat exchanger, the refrigerant is stored in the outdoor heat exchanger. In this state, the fourth valve mechanism is changed to a state in which the refrigerant does not flow in the direction from the compressor toward the indoor heat exchanger, whereby the refrigerant in the refrigerant circuit can be collected in the outdoor unit.

  In the second aspect of the invention, when the boiling of hot water for hot water stored in the hot water supply tank is completed during normal operation, heating by the hot water supply heating pipe is no longer necessary, and supply of refrigerant to the hot water supply heating pipe is performed. When the refrigerant is no longer needed, the refrigerant pressure loss can be reduced when the refrigerant discharged from the compressor is supplied directly to the outdoor heat exchanger without passing through the hot water supply heating pipe. be able to.

  In the third aspect of the invention, one end of the second bypass circuit is connected not to the circuit from the first valve mechanism to the hot water supply heating pipe but to the circuit from the hot water supply heating pipe to the second valve mechanism. The refrigerant pressure in the circuit from the valve mechanism to the second valve mechanism through the hot water heating pipe is a circuit from the first valve mechanism to the hot water heating pipe in the circuit from the hot water heating pipe to the second valve mechanism. Since it is lower, the amount of refrigerant flowing through the second bypass circuit during the air conditioning operation can be reduced. Moreover, at the time of air-conditioning operation start-up, the refrigerant and oil in the vicinity of the hot water supply heating pipe can be quickly returned to the compressor. Further, the other end of the second bypass circuit is connected not to the circuit from the third valve mechanism to the indoor heat exchanger but to the circuit from the indoor heat exchanger to the fourth valve mechanism. Since the refrigerant recovery path to the compressor via the 2 bypass circuit is shortened, the refrigerant in the vicinity of the hot water supply heating pipe can be quickly recovered by the compressor during the refrigerant recovery operation. Further, the state of the refrigerant supplied to the compressor can be brought closer to the overheated state from the wet state.

  In the fourth invention, since the first bypass circuit and the second bypass circuit are configured to be openable and closable, the first bypass circuit and the second bypass circuit can be used only during the refrigerant recovery operation. In addition, during normal operation, when the boiling of hot water for hot water stored in the hot water tank is completed, heating by the hot water heating pipe is no longer necessary, and supply of refrigerant to the hot water heating pipe is no longer necessary. When the first bypass circuit is switched to the open state, the refrigerant discharged from the compressor can be directly supplied to the outdoor heat exchanger without passing through the hot water supply heating pipe, thereby improving the air conditioning operation capacity. be able to. Further, during normal operation, it is possible to reduce the flow of refrigerant through the second bypass circuit from the hot water supply heating pipe toward the fourth valve mechanism, so that the air conditioning operation capability can be improved.

  In the fifth invention, since the second bypass circuit is composed of a capillary tube, the space for installing the second bypass circuit can be reduced, and an electric valve or the like is provided in the second bypass circuit to switch to the closed state. Even without this, normal operation can be performed.

  In the sixth aspect of the invention, the first bypass circuit and the second bypass circuit are configured as service hoses which are separate parts, and are configured to be detachable from the refrigerant circuit. The number of parts can be reduced and the manufacturing cost can be reduced. Further, by providing an electric valve or the like in the second bypass circuit and controlling the electric valve or the like, the control of the air conditioning and hot water supply system can be simplified as compared with the case where the second bypass circuit is switched to the open state or the closed state. .

  In 7th invention, the hot water for hot water supply stored in the hot water supply tank can be heated.

It is a refrigerant circuit figure of the air-conditioning hot-water supply system concerning a 1st embodiment of the present invention. It is a flowchart which shows the operation | movement by bypass control in the air-conditioning hot-water supply system of FIG. It is a refrigerant circuit figure of the air-conditioning hot-water supply system which concerns on 2nd Embodiment of this invention. It is a refrigerant circuit figure of the air-conditioning hot-water supply system which concerns on 3rd Embodiment of this invention. It is a refrigerant circuit figure of the air-conditioning hot-water supply system which concerns on 4th Embodiment of this invention. It is a refrigerant circuit figure of the air-conditioning hot-water supply system which concerns on 5th Embodiment of this invention. It is a refrigerant circuit figure of the air-conditioning hot-water supply system which concerns on 6th Embodiment of this invention.

  Hereinafter, an embodiment of an air conditioning and hot water supply system according to the present invention will be described based on the drawings.

[First Embodiment]
An air conditioning and hot water supply system according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 is a refrigerant circuit diagram of the air conditioning and hot water supply system according to the first embodiment of the present invention.

(overall structure)
The air-conditioning hot-water supply system 1 according to the present embodiment includes an outdoor unit 2, three indoor units 3 each disposed in a room where air conditioning is performed, and a hot-water supply tank 4 that stores hot water for hot-water supply. . The hot water stored in the hot water supply tank 4 is supplied to a hot water supply terminal 5 for supplying hot water for hot water supply. Here, the outdoor unit 2 includes pipe connection portions 2a and 2b to which connection pipes 6a and 6b for connecting to a hot water supply and heating pipe 12 wound so as to come into contact with the periphery of the hot water supply tank 4 are connected. , Connecting pipes 2c and 2d to which connecting pipes 6c and 6d for connecting to the indoor unit 3 are connected. Therefore, the outdoor unit 2 and the indoor unit 3 are connected via the connection pipes 6c and 6d, and the outdoor unit 2 and the hot water supply heating pipe 12 are connected via the connection pipes 6a and 6b. .

  And the air-conditioning hot water supply system 1 becomes the compressor 11, the hot water supply heating piping 12, the outdoor heat exchanger 14, the header 16 for branching a refrigerant | coolant with respect to the three indoor units 3, and the pressure reduction mechanism. The motor-driven valve 17 and the indoor heat exchanger 18 are provided with the refrigerant circuit 10 connected in order.

  Further, the refrigerant circuit 10 is provided with closing valves 21, 22, 23, and 24 arranged in the outdoor unit 2. The closing valves 21 to 24 are configured to be switchable between an open state and a closed state by manual operation. Note that the closing valves 21 to 24 are switched so as to be in an open state during normal operation.

  The shut-off valve 21 is provided in a circuit between the compressor 11 and the pipe connection portion 2a in the outdoor unit 2. The shut-off valve 21 can be regulated so that the refrigerant does not flow between the compressor 11 and the hot water supply heating pipe 12 by being switched to the closed state in the circuit from the compressor 11 to the hot water supply heating pipe 12. .

  The shut-off valve 22 is provided in a circuit between the pipe connection portion 6 b and the outdoor heat exchanger 14 in the outdoor unit 2. The shutoff valve 22 is switched to a closed state in the circuit from the hot water supply heating pipe 12 to the outdoor heat exchanger 14, so that no refrigerant flows between the hot water supply heating pipe 12 and the outdoor heat exchanger 14. Can be regulated.

  The shut-off valve 23 is provided in a circuit between the outdoor heat exchanger 14 and the pipe connection portion 6 c in the outdoor unit 2. This closing valve 23 can be regulated so that no refrigerant flows between the outdoor heat exchanger 14 and the electric valve 17 by being switched to a closed state in the circuit from the outdoor heat exchanger 14 to the electric valve 17. .

  The shut-off valve 24 is provided in a circuit between the pipe connection portion 6 d and the compressor 11 in the outdoor unit 2. The closing valve 24 can be regulated so that the refrigerant does not flow between the indoor heat exchanger 18 and the compressor 11 by being switched to a closed state in the circuit from the indoor heat exchanger 18 to the compressor 11. .

  The refrigerant circuit 10 further includes a first bypass circuit 30 that connects a circuit from the compressor 11 to the closing valve 21 and a circuit from the closing valve 22 to the outdoor heat exchanger 14. The first bypass circuit 30 is provided with an electric valve 31. The motor-operated valve 31 can change the amount of refrigerant flowing through the first bypass circuit 30 from the compressor 11 toward the outdoor heat exchanger 14 by changing its opening degree. Therefore, the first bypass circuit 30 can be switched to an open state in which the refrigerant flows or a closed state in which the refrigerant does not flow by controlling the motor operated valve 31 by a control unit (not shown).

  Here, when the shut-off valve 21 is open and the first bypass circuit 30 is closed, all of the refrigerant discharged from the compressor 11 flows toward the hot water supply heating pipe 12. . On the other hand, when the closing valve 21 is open and the first bypass circuit 30 is open, a part of the refrigerant discharged from the compressor 11 passes through the first bypass circuit 30. While flowing toward the outdoor heat exchanger 14, the remainder flows toward the hot water supply heating pipe 12. In particular, when the motor-operated valve 31 provided in the first bypass circuit 30 is almost fully open, most of the refrigerant discharged from the compressor 11 is directed to the outdoor heat exchanger 14 via the first bypass circuit 30. Flowing. Further, when the closing valve 21 is in the closed state and the first bypass circuit 30 is in the open state, all of the refrigerant discharged from the compressor 11 passes through the first bypass circuit 30 and the outdoor heat. It flows toward the exchanger 14.

  In addition, the refrigerant circuit 10 extends from the hot water supply heating pipe 12 to the closing valve 22 (in FIG. 1, the circuit between the pipe connecting portion 2b and the closing valve 22), and from the indoor heat exchanger 18 to the closing valve 24. It has the 2nd bypass circuit 40 which connects a circuit (The circuit between 2 d of piping connection parts and the closing valve 24 in FIG. 1). The second bypass circuit 40 is provided with an electric valve 41. The motor-operated valve 41 can change the amount of refrigerant flowing through the second bypass circuit 40 from the hot water supply heating pipe 12 (pipe connecting portion 2b) toward the shut-off valve 24 by changing its opening degree. Therefore, the second bypass circuit 40 can be switched to an open state where the refrigerant flows or a closed state where the refrigerant does not flow by controlling the motor operated valve 41 by a control unit (not shown).

[Refrigerant recovery operation]
Next, the refrigerant | coolant collection | recovery operation | movement in the air-conditioning hot-water supply system 1 is demonstrated with reference to FIG. FIG. 2 is a flowchart showing a refrigerant recovery operation in the air conditioning and hot water supply system of FIG. Here, a case where the refrigerant recovery operation is started when the closing valves 21 to 24 are in the open state will be described.

  First, in step S101, the operation of the compressor 11 is started, and the closing valves 21, 22, and 23 are changed to the closed state, and the electric valve 31 of the first bypass circuit 30 and the electric valve 41 of the second bypass circuit 40 are changed. And are changed to the open state. This state corresponds to the refrigerant in the circuit on the indoor unit 3 side (circuit from the closing valve 23 to the motor operated valve 17 and the indoor heat exchanger 18 to the closing valve 24), and the circuit on the hot water supply tank 4 side (closing). The refrigerant in the circuit) from the valve 21 through the hot water supply heating pipe 12 to the closing valve 22 is continued until a sufficient time has passed to flow toward the compressor 11 via the closing valve 24. Thereafter, in step S102, the closing valve 24 is changed to a closed state. Through the above operation, the refrigerant in the circuit on the indoor unit 3 side and the circuit on the hot water supply tank 4 side is collected by the outdoor unit 2. In step S103, the operation of the compressor is stopped, and the refrigerant recovery operation ends.

[Characteristics of the air conditioning and hot water supply system according to the first embodiment]
The air conditioning and hot water supply system according to the present embodiment has the following characteristics.

  In the air conditioning and hot water supply system 1 of the present embodiment, when the refrigerant in the refrigerant circuit 10 is collected in the outdoor unit 2, the compressor is operated, and first, the closing valves 21, 22, and 23 are changed to the closed state, The first bypass circuit 30 and the second bypass circuit 40 are changed to an open state. Then, the refrigerant in the circuit on the indoor unit 3 side (the circuit from the closing valve 23 to the electric valve 17 and the indoor heat exchanger 18 to the closing valve 24) flows toward the compressor 11 through the closing valve 24. The refrigerant in the hot water supply tank 4 side circuit (the circuit extending from the closing valve 21 to the closing valve 22 through the hot water supply heating pipe 12) is directed to the compressor 11 via the second bypass circuit 40 and the closing valve 24. Flowing. In this way, the refrigerant in the circuit on the indoor unit 3 side and the circuit on the hot water supply tank 4 side is supplied to the compressor 11. At this time, the refrigerant discharged from the compressor 11 is supplied to the outdoor heat exchanger 14 via the first bypass circuit 30 without passing through the hot water supply heating pipe 12, but the closing valve 23 is closed. Therefore, it is stored in the outdoor heat exchanger 14. In this state, the refrigerant in the refrigerant circuit 10 can be collected in the outdoor unit 2 by switching the closing valve 24 to the closed state.

  Further, since the first bypass circuit 30 and the second bypass circuit 40 are configured to be openable and closable, the first bypass circuit 30 and the second bypass circuit 40 can be used only during the refrigerant recovery operation.

  In addition, during normal operation, when boiling of hot water for hot water stored in the hot water supply tank 4 is completed, heating by the hot water supply heating pipe 12 is not necessary, and supply of refrigerant to the hot water supply heating pipe 12 is not required. By switching the first bypass circuit 30 to the open state when it is no longer needed, the refrigerant discharged from the compressor 11 can be directly supplied to the outdoor heat exchanger 14 without passing through the hot water supply heating pipe 12. The air-conditioning operation capability can be improved. At this time, since the first bypass circuit 30 connects the discharge-side piping of the compressor 11 and the inlet-side piping of the outdoor heat exchanger 14, the pressure loss of the refrigerant can be reduced and the cooling capacity is improved. Can be made.

  Further, during normal operation, switching the second bypass circuit 40 to the closed state prevents the refrigerant from flowing through the second bypass circuit 40, so that the cooling capacity can be improved.

  In addition, since one end of the second bypass circuit 40 is connected to a circuit from the hot water supply heating pipe 12 to the shutoff valve 22 instead of a circuit from the shutoff valve 21 to the hot water supply heating pipe 12, the second bypass circuit 40 is connected to the second bypass circuit 40 during the cooling operation. The amount of refrigerant flowing through the bypass circuit 40 can be reduced. Moreover, the refrigerant | coolant and oil in the vicinity of the hot water supply heating pipe 12 can be quickly returned to the compressor when the cooling operation is started. The other end of the second bypass circuit 40 is not connected to the circuit from the closing valve 23 to the indoor heat exchanger 18 but to the circuit from the indoor heat exchanger 18 to the closing valve 24. Since the refrigerant recovery path from the first through the second bypass circuit 40 to the compressor 11 is shortened, the refrigerant in the vicinity of the hot water supply heating pipe 12 can be quickly recovered in the compressor 11 during the refrigerant recovery operation. . Further, the state of the refrigerant supplied to the compressor 11 can be brought closer to the overheated state from the wet state.

[Second Embodiment]
Next, an air conditioning and hot water supply system according to a second embodiment will be described. FIG. 3 is a refrigerant circuit diagram of the air conditioning and hot water supply system according to the second embodiment of the present invention.

  The air-conditioning hot-water supply system according to the present embodiment is mainly different from the air-conditioning hot-water supply system 1 according to the first embodiment in that, in the first embodiment, the second bypass circuit 40 is configured by general piping. On the other hand, in the present embodiment, the second bypass circuit 140 is configured by a small diameter capillary tube. Since other points are the same as the configuration of the first embodiment, detailed description thereof is omitted.

  In the present embodiment, a circuit from the hot water supply heating pipe 12 to the closing valve 22 (in FIG. 3, a circuit between the pipe connecting portion 2b and the closing valve 22) and a circuit from the indoor heat exchanger 18 to the closing valve 24 ( In FIG. 3, the second bypass circuit 140 for connecting the pipe connection portion 2d and the circuit between the shut-off valve 24) is formed of a small diameter capillary tube. The second bypass circuit 140 is not provided with a motor operated valve. Accordingly, even during normal operation, a small amount of refrigerant flows through the second bypass circuit 140 from the hot water supply heating pipe 12 (pipe connection portion 2b) toward the shut-off valve 24. Is of a level that has little effect.

[Characteristics of Air Conditioning Hot Water Supply System According to Second Embodiment]
In the air conditioning and hot water supply system according to the present embodiment, the refrigerant in the refrigerant circuit can be collected in the outdoor unit 2 as in the first embodiment. In addition, since the second bypass circuit 140 is composed of a small diameter capillary tube, the space for installing the second bypass circuit can be reduced, and an electric valve or the like is provided in the second bypass circuit to switch to the closed state. Even without this, normal operation can be performed.

[Third Embodiment]
Next, an air conditioning hot water supply system according to a third embodiment will be described. FIG. 4 is a refrigerant circuit diagram of an air conditioning and hot water supply system according to a third embodiment of the present invention.

  The main difference between the air conditioning and hot water supply system according to this embodiment and the air conditioning and hot water supply system 1 according to the first embodiment is that, in the first embodiment, the second bypass circuit 40 is always included in the refrigerant circuit 10. On the other hand, in the present embodiment, the second bypass circuit 240 is configured to be detachable from the refrigerant circuit. Since other points are the same as the configuration of the first embodiment, detailed description thereof is omitted.

  In the present embodiment, the shut-off valve 122 is provided in a circuit from the hot water supply heating pipe 12 to the outdoor heat exchanger 14 (a circuit between the pipe connection portion 2b and the outdoor heat exchanger 14 in FIG. 4). The shut-off valve 124 is provided in a circuit from the indoor heat exchanger 18 to the compressor 11 (a circuit between the pipe connection portion 2d and the compressor 11 in FIG. 4). Each of the closing valve 122 and the closing valve 124 is configured to be connectable to a second bypass circuit 240 configured as a service hose which is a separate part.

  Here, the closing valve 122 can be regulated so that the refrigerant does not flow between the hot water supply heating pipe 12 and the outdoor heat exchanger 14 by being switched to the closed state. Further, the closing valve 124 can be regulated so that the refrigerant does not flow between the indoor heat exchanger 18 and the compressor 11 by being switched to the closed state. When the second bypass circuit 240 is connected to the shut-off valve 122 when the shut-off valve 122 is in the closed state, the hot water supply heating pipe 12 (pipe connecting portion 2b) is connected to the second bypass circuit 240. Although the refrigerant can flow, the refrigerant cannot flow from the outdoor heat exchanger 14 to the second bypass circuit 240. Further, when the second bypass circuit 240 is connected to the closing valve 124 when the closing valve 124 is in the closed state, the refrigerant can flow from the second bypass circuit 240 toward the compressor 11. The refrigerant cannot flow from the second bypass circuit 240 toward the indoor heat exchanger 18.

[Characteristics of Air Conditioning Hot Water Supply System According to Third Embodiment]
In the air conditioning and hot water supply system according to the present embodiment, the refrigerant in the refrigerant circuit can be collected in the outdoor unit 2 as in the first embodiment. Moreover, since the second bypass circuit 240 is configured as a service hose which is another component and is detachable from the refrigerant circuit, the number of components at the time of factory shipment as an air-conditioning hot-water supply system is reduced. Cost can be reduced. Further, as in the first embodiment, a motor valve 41 is provided in the second bypass circuit 40, and the motor valve 41 is controlled to switch the second bypass circuit 40 to an open state or a closed state. Control of the air conditioning and hot water supply system can be simplified.

[Fourth Embodiment]
Next, an air conditioning and hot water supply system according to a fourth embodiment will be described. FIG. 5 is a refrigerant circuit diagram of an air conditioning and hot water supply system according to a fourth embodiment of the present invention.

  The main difference between the air conditioning and hot water supply system according to the present embodiment and the air conditioning and hot water supply system 1 according to the first embodiment is that in the first embodiment, the motor operated valve 31 provided in the first bypass circuit 30 is controlled. In the present embodiment, the first bypass circuit 30 is switched to the open state or the closed state. On the other hand, in the present embodiment, the three-way valve 131 is provided in the discharge-side piping of the compressor 11 to open the first bypass circuit 130. The point is that it is switched to the closed state. Since other points are the same as the configuration of the first embodiment, detailed description thereof is omitted.

  In the present embodiment, the refrigerant circuit has a first bypass circuit 130 that connects a circuit from the compressor 11 to the closing valve 21 and a circuit from the closing valve 22 to the outdoor heat exchanger 14. A three-way valve 131 is provided at a connection portion between the first bypass circuit 130 and the circuit from the compressor 11 to the closing valve 21. The three-way valve 131 includes a state in which the refrigerant discharged from the compressor 11 is supplied to the outdoor heat exchanger 14 via the first bypass circuit 130 (a state in which the first bypass circuit 30 is in an open state), and a compressor The state in which the refrigerant discharged from 11 is supplied to the hot water supply heating pipe 12 (the state in which the first bypass circuit 30 is closed) can be switched. A check valve 133 is provided between the closing valve 22 and a portion where the bypass circuit 130 joins in the circuit from the closing valve 22 to the outdoor heat exchanger 14. In the check valve 133, the refrigerant flows from the closing valve 22 toward the outdoor heat exchanger 14, but cannot flow from the outdoor heat exchanger 14 toward the closing valve 22.

[Characteristics of Air Conditioning Hot Water Supply System According to Fourth Embodiment]
In the air conditioning and hot water supply system according to the present embodiment, the refrigerant in the refrigerant circuit can be collected in the outdoor unit 2 as in the first embodiment. Further, in the normal operation, when boiling of hot water for hot water stored in the hot water supply tank 4 is completed, heating of hot water for hot water supply by the hot water supply heating pipe 12 is not necessary, and When supply of the refrigerant is no longer necessary, the refrigerant discharged from the compressor 11 can be directly supplied to the outdoor heat exchanger 14 without passing through the hot water supply heating pipe 12 by switching the three-way valve 131. Therefore, the cooling capacity can be improved.

[Fifth Embodiment]
Next, an air conditioning and hot water supply system according to a fifth embodiment will be described. FIG. 6 is a refrigerant circuit diagram of an air conditioning and hot water supply system according to a fifth embodiment of the present invention.

  The air conditioning and hot water supply system according to this embodiment is mainly different from the air conditioning and hot water supply system 1 according to the first embodiment in that, in the first embodiment, the first bypass circuit 30 is connected to the discharge side piping and the outdoor of the compressor 11. In contrast to connecting the piping on the inlet side of the heat exchanger 14, in the present embodiment, the first bypass circuit 230 connects the piping on the discharge side of the compressor 11 and the piping on the outlet side of the outdoor heat exchanger 14. It is a point to connect. Since other points are the same as the configuration of the first embodiment, detailed description thereof is omitted.

  In the present embodiment, the refrigerant circuit has a first bypass circuit 230 that connects a circuit from the compressor 11 to the closing valve 21 and a circuit from the outdoor heat exchanger 14 to the closing valve 23. The first bypass circuit 230 is provided with an electric valve 231.

[Characteristics of Air Conditioning Hot Water Supply System According to Fifth Embodiment]
In the air conditioning and hot water supply system according to the present embodiment, the refrigerant in the refrigerant circuit can be collected in the outdoor unit 2 as in the first embodiment.

[Sixth Embodiment]
Next, an air conditioning and hot water supply system according to a sixth embodiment will be described. FIG. 7 is a refrigerant circuit diagram of an air conditioning and hot water supply system according to a sixth embodiment of the present invention.

  The air conditioning and hot water supply system according to this embodiment is mainly different from the air conditioning and hot water supply system 1 according to the first embodiment in that, in the first embodiment, the first bypass circuit 30 is connected to the discharge side piping and the outdoor of the compressor 11. In contrast to connecting the piping on the inlet side of the heat exchanger 14, in the present embodiment, the first bypass circuit 330 connects the piping on the discharge side of the compressor 11 and the piping on the intermediate portion of the outdoor heat exchanger 14. It is a point to connect. Since other points are the same as the configuration of the first embodiment, detailed description thereof is omitted.

  In the present embodiment, the refrigerant circuit includes a circuit extending from the compressor 11 to the shut-off valve 21, a pipe in the middle of the outdoor heat exchanger 14 (an arbitrary pipe between the inlet and the outlet of the outdoor heat exchanger 14). The first bypass circuit 330 is connected. The first bypass circuit 330 is provided with an electric valve 331. In addition, in FIG. 7, about the connection of the 1st bypass circuit 330 and the piping of the intermediate part of the outdoor heat exchanger 14, it has illustrated typically.

[Characteristics of Air Conditioning Hot Water Supply System According to Sixth Embodiment]
In the air conditioning and hot water supply system according to the present embodiment, the refrigerant in the refrigerant circuit can be collected in the outdoor unit 2 as in the first embodiment. In addition, since the first bypass circuit 330 is connected to the pipe in the intermediate portion of the outdoor heat exchanger 14, the gas refrigerant discharged from the compressor 11 is converted into liquid refrigerant on the downstream side of the intermediate portion of the outdoor heat exchanger 14. Therefore, the cooling operation can be performed.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  In the first to fourth embodiments described above, the first bypass circuit connects the circuit from the compressor 11 to the closing valve 21 and the circuit from the closing valve 22 to the outdoor heat exchanger 14, but this It is not limited to. Accordingly, the first bypass circuit includes, for example, a circuit extending from the compressor 11 to the closing valve 21 and a circuit extending from the closing valve 22 to the closing valve 23 via the outdoor heat exchanger 14 as shown in the fifth and sixth embodiments. What is necessary is just to connect.

  In the first to sixth embodiments described above, the second bypass circuit connects the circuit from the hot water supply heating pipe 12 to the closing valve 22 and the circuit from the indoor heat exchanger 18 to the closing valve 24. However, the present invention is not limited to this. Accordingly, the second bypass circuit connects a circuit from the closing valve 21 to the closing valve 22 through the hot water supply heating pipe 12 and a circuit from the closing valve 23 to the closing valve 24 through the indoor heat exchanger 18. I just need it.

  In the above-described first to sixth embodiments, the closing valve 23 is provided in the circuit from the outdoor heat exchanger 14 to the electric valve 17 that is a pressure reducing mechanism, but is not limited thereto. Therefore, the closing valve 23 may be provided in a circuit from the outdoor heat exchanger 14 to the indoor heat exchanger 18 through the electric valve 17 that is a pressure reducing mechanism.

  In the first, second, and fourth to sixth embodiments described above, a shutoff valve 22 is provided in the circuit from the hot water supply heating pipe 12 to the outdoor heat exchanger 14, and the hot water supply heating pipe 12 and Although it is configured such that the refrigerant can be regulated so as not to flow between the outdoor heat exchanger 14, the present invention is not limited to this. Therefore, a check valve is provided in the circuit from the hot water supply heating pipe 12 to the outdoor heat exchanger 14, and the check valve provides a refrigerant flowing from the hot water supply heating pipe 12 toward the outdoor heat exchanger 14. The refrigerant may be configured so that the refrigerant does not flow from the outdoor heat exchanger 14 toward the hot water supply heating pipe 12. In other words, the circuit from the hot water supply heating pipe 12 to the outdoor heat exchanger 14 is provided with a second valve mechanism that can restrict the refrigerant from flowing in the direction from the outdoor heat exchanger 12 toward the hot water supply heating pipe 14. It only has to be. Similarly, the closing valve 21, the closing valve 23, and the closing valve 24 respectively have a direction from the compressor 11 toward the hot water supply heating pipe 12, a direction from the outdoor heat exchanger 14 toward the indoor heat exchanger 18, and a compressor. Any material can be used as long as it can be regulated so that the refrigerant does not flow in the direction from 11 to the indoor heat exchanger 14.

  Moreover, in the above-mentioned 3rd Embodiment, the 2 closing valves 22 and 24 connect the 2nd bypass circuit 240 comprised as a service hose which is another components among the closing valves 21-24 of 1st Embodiment. It is changed to the closing valve 122 and the closing valve 124 which are configured to be possible, and the closing valve 122 and the closing valve 124 are connected via the second bypass circuit 240, but are not limited thereto. Therefore, in the first embodiment, the two closing valves 22, 23, the two closing valves 21, 24, or the two closing valves 21, 23 are separate components. The second bypass circuit 240 configured as a hose may be changed to two closing valves configured to be connectable, and the two closing valves may be connected via the second bypass circuit 240. Moreover, in this invention, the 1st bypass circuit comprised as a service hose which is another components may be comprised so that attachment or detachment with respect to a refrigerant circuit is possible.

  In the first to sixth embodiments described above, the hot water supply heating pipe 12 for heating the hot water supply hot water is wound so as to be in contact with the periphery of the hot water supply tank 4 in which the hot water supply hot water is stored. Although it was piping, it is not limited to this, It is piping arrange | positioned in the hot water supply tank 4, Comprising: The piping which contacts and heats the hot water for hot water supply may be sufficient. Further, the hot water supply heating pipe for heating the hot water supply hot water may be, for example, a pipe for heating the hot water supply hot water flowing through the double pipe.

  In the first to sixth embodiments described above, the number of indoor units 3 is described as three. However, the number of indoor units is not limited to this, and may be one, for example.

  If the present invention is used, the refrigerant in the circuit on the hot water supply tank side can be recovered in the outdoor unit without using an external refrigerant recovery machine.

DESCRIPTION OF SYMBOLS 1 Air-conditioning hot water supply system 2 Outdoor unit 3 Indoor unit 4 Hot water supply tank 10 Refrigerant circuit 11 Compressor 12 Hot water heating pipe 14 Outdoor heat exchanger 17 Electric valve 18 Indoor heat exchangers 21, 22, 23, 24 Shut-off valves 30, 130 , 230, 330 First bypass piping 31, 231, 331 Motorized valves 40, 140, 240 Second bypass piping 41 Motorized valve 131 Three-way valve

Claims (7)

An outdoor unit having a compressor, an outdoor heat exchanger, and a pressure reducing mechanism, a hot water supply heating pipe for heating hot water for hot water supply, and an indoor unit having an indoor heat exchanger disposed in a room where air conditioning is performed An air-conditioning hot-water supply system,
A refrigerant circuit in which the compressor, the hot water supply heating pipe, the outdoor heat exchanger, the decompression mechanism, and the indoor heat exchanger are connected in order;
The refrigerant circuit is
A first valve mechanism that is provided in the outdoor unit and that can regulate the refrigerant not to flow in a direction from the compressor toward the hot water supply heating pipe in a circuit from the compressor to the hot water supply heating pipe;
A second valve provided in the outdoor unit and capable of regulating refrigerant from flowing in a direction from the outdoor heat exchanger toward the hot water supply heating pipe in a circuit from the hot water supply heating pipe to the outdoor heat exchanger. Mechanism,
In the circuit provided in the outdoor unit and extending from the outdoor heat exchanger to the indoor heat exchanger via the pressure reducing mechanism, the refrigerant is restricted from flowing in the direction from the outdoor heat exchanger toward the indoor heat exchanger. A third valve mechanism capable of;
A fourth valve mechanism that is provided in the outdoor unit and that can restrict the refrigerant from flowing in a direction from the compressor toward the indoor heat exchanger in a circuit from the indoor heat exchanger to the compressor;
A first bypass circuit that connects a circuit from the compressor to the first valve mechanism and a circuit from the second valve mechanism to the third valve mechanism through the outdoor heat exchanger;
A second circuit that connects a circuit from the first valve mechanism to the second valve mechanism through the hot water supply heating pipe and a circuit from the third valve mechanism to the fourth valve mechanism through the indoor heat exchanger. An air conditioning and hot water supply system comprising a bypass circuit.   The first bypass circuit connects a circuit from the compressor to the first valve mechanism and a circuit from the second valve mechanism to the outdoor heat exchanger. Air conditioning and hot water supply system.   The second bypass circuit connects a circuit from the hot water supply heating pipe to the second valve mechanism and a circuit from the indoor heat exchanger to the fourth valve mechanism. 2. The air conditioning and hot water supply system according to 2.   The said 1st bypass circuit and the said 2nd bypass circuit are each comprised so that opening and closing is possible, The air-conditioning hot-water supply system of any one of Claims 1-3 characterized by the above-mentioned.   The air conditioning and hot water supply system according to any one of claims 1 to 4, wherein the second bypass circuit is configured by a capillary tube.   6. The air conditioning and hot water supply system according to claim 1, wherein at least one of the first bypass circuit and the second bypass circuit is configured to be attachable to and detachable from the refrigerant circuit. .   The said hot water supply heating piping is a piping which contacts the hot water supply tank which stored the hot water for hot water supply, or the piping arrange | positioned in the said hot water supply tank, The any one of Claims 1-6 characterized by the above-mentioned. Air conditioning and hot water supply system.

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