JPWO2020044386A1 - Refrigeration equipment and heat source side unit - Google Patents

Abstract

The refrigerating device (100) includes a refrigerant circuit in which a refrigerant circulates. The refrigerant circuit includes a compressor (1), a heat source side heat exchanger (2), an auxiliary heat exchanger (3), a first decompression unit (4), a user side heat exchanger (5), and a second decompression unit (6). ), And the flow path switching part. The flow path switching unit switches between the first state and the second state. In the first state, the heat source side heat exchanger (2) and the auxiliary heat exchanger (3) act as the first condenser, the utilization side heat exchanger (5) acts as the first evaporator, and the refrigerant acts as the first evaporator. It flows through the compressor (1), the first condenser, the first decompression unit (4), and the first evaporator in this order. In the second state, the utilization side heat exchanger (5) acts as the second condenser, the auxiliary heat exchanger (3) acts as the second evaporator, and the refrigerant acts as the compressor (1) and the second condenser. It flows through the vessel, the second decompression unit (6), and the second evaporator in order.

Description

The present invention relates to a refrigerating device and a heat source side unit.

Conventionally, there is known a refrigerating device that can switch between a cooling operation by an evaporator (heat exchanger on the user side) and a defrosting operation for the evaporator.

Japanese Unexamined Patent Publication No. 2006-336967 discloses a refrigerating apparatus in which a high-temperature refrigerant discharged from a compressor is supplied to a heat exchanger to be defrosted during a defrosting operation.

Japanese Unexamined Patent Publication No. 2006-336967

However, in the above refrigerating apparatus, the refrigerant supplied from the compressor to the heat exchanger to be defrosted during the defrosting operation is compressed without flowing through other heat exchangers after flowing out of the heat exchanger. Inhaled into the machine. Therefore, in the above refrigerating apparatus, it is necessary to limit the amount of heat supplied to the heat exchanger to be defrosted, and it is difficult to improve the defrosting efficiency.

A main object of the present invention is to provide a refrigerating apparatus having a higher defrosting efficiency than a conventional refrigerating apparatus and a heat source side unit constituting a part of the refrigerating apparatus.

The refrigerating apparatus according to the present invention includes a refrigerant circuit in which a refrigerant circulates. The refrigerant circuit includes a compressor, a heat source side heat exchanger, a first decompression unit, a utilization side heat exchanger, a second decompression unit, an auxiliary heat exchanger, and a flow path switching unit. In the flow path switching section, the heat source side heat exchanger and the auxiliary heat exchanger act as the first condenser, the utilization side heat exchanger acts as the first evaporator, and the refrigerant is the compressor, the first condenser, and the like. The first state in which the first decompression unit and the first evaporator flow in order, the utilization side heat exchanger acts as the second condenser, the auxiliary heat exchanger acts as the second evaporator, and the refrigerant acts as a compressor. , The second condenser, the second decompression unit, and the second state of flowing through the second evaporator in order.

According to the present invention, since the auxiliary heat exchanger acts as an evaporator in the second state, the refrigerating apparatus having higher defrosting efficiency than the conventional refrigerating apparatus and the heat source side unit constituting a part of the refrigerating apparatus can be provided. Can be provided.

It is a figure which shows the refrigerating apparatus and the heat source side unit which concerns on Embodiment 1. FIG. It is a figure which shows the 1st state of the refrigerating apparatus and a heat source side unit shown in FIG. It is a figure which shows the 2nd state of the refrigerating apparatus and a heat source side unit shown in FIG. It is a figure which shows the refrigerating apparatus and the heat source side unit which concerns on Embodiment 2. It is a figure which shows the 1st state of the refrigerating apparatus and a heat source side unit shown in FIG. It is a figure which shows the 2nd state of the refrigerating apparatus and a heat source side unit shown in FIG. It is a figure which shows the refrigerating apparatus and the heat source side unit which concerns on Embodiment 3. It is a figure which shows the 1st state of the refrigerating apparatus and a heat source side unit shown in FIG. 7. It is a figure which shows the 2nd state of the refrigerating apparatus and a heat source side unit shown in FIG. 7. It is a figure which shows the refrigerating apparatus and the heat source side unit which concerns on Embodiment 4. It is a figure which shows the 1st state of the refrigerating apparatus and a heat source side unit shown in FIG. It is a figure which shows the 2nd state of the refrigerating apparatus and a heat source side unit shown in FIG. It is a figure which shows the modification of the refrigerating apparatus and the heat source side unit which concerns on Embodiment 4. FIG. It is a figure which shows the other modification of the refrigerating apparatus and the heat source side unit which concerns on Embodiment 1. FIG. It is a figure which shows the 1st state of the further modification of the refrigerating apparatus and the heat source side unit which concerns on Embodiment 1. FIG. It is a figure which shows the 2nd state of the refrigerating apparatus and a heat source side unit shown in FIG. It is a figure which shows the 1st state of the modification of the refrigerating apparatus and the heat source side unit shown in FIG. 15 and FIG. It is a figure which shows the further modification example of the refrigerating apparatus and the heat source side unit which concerns on Embodiment 1. FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In principle, the same or corresponding parts in the drawings are designated by the same reference numerals and the description is not repeated.

Embodiment 1.
As shown in FIGS. 1 to 3, the refrigerating device 100 according to the first embodiment includes a refrigerant circuit in which a refrigerant circulates. The refrigerant circuit includes a compressor 1, a heat source side heat exchanger 2, an auxiliary heat exchanger 3, a first decompression unit 4, a utilization side heat exchanger 5, a second decompression unit 6, a plurality of flow path switching units, and a plurality of flow path switching units. Includes rectifier. The refrigerating apparatus 100 further includes a first fan 7, a second fan 8, and a third fan 9. The refrigerant is not particularly limited, but includes, for example, a refrigerant having a low global warming potential (GWP) and at least one selected from the group consisting of _{R410A, R32 and CO 2.} The refrigerant may be a mixed refrigerant containing at least one selected from the above group.

The compressor 1 has a suction port 1A into which the refrigerant is sucked and a discharge port 1B in which the refrigerant is discharged. The compressor 1 is, for example, an inverter compressor in which the rotation speed is controlled by an inverter. The heat source side heat exchanger 2, the auxiliary heat exchanger 3, and the utilization side heat exchanger 5 are provided so as to perform heat exchange between, for example, the refrigerant and air. The heat source side heat exchanger 2 has a first inflow / outflow section 2A and a second inflow / outflow section 2B through which the refrigerant flows in and out. The auxiliary heat exchanger 3 has a third inflow / outflow section 3A and a fourth inflow / outflow section 3B through which the refrigerant flows in and out. The user-side heat exchanger 5 has a fifth inflow / outflow section 5A and a sixth inflow / outflow section 5B through which the refrigerant flows in and out. The first decompression unit 4 and the second decompression unit 6 are, for example, electronic expansion valves whose opening degree can be adjusted. The first decompression section 4 and the second decompression section 6 may be capillaries whose opening degree cannot be adjusted.

The user-side heat exchanger 5 is arranged inside the space to be cooled by the refrigerating device 100, for example, in the freezer. The compressor 1, the heat source side heat exchanger 2, the auxiliary heat exchanger 3, the first decompression unit 4, and the second decompression unit 6 are arranged outside the space, for example, outside the freezer. The first fan 7 supplies the air outside the freezer to the heat source side heat exchanger 2. The second fan 8 supplies the air outside the freezer to the auxiliary heat exchanger 3. The third fan 9 supplies the air in the freezer to the heat exchanger 5 on the user side.

The plurality of flow path switching units are provided so as to switch the circulation path of the refrigerant in the refrigerant circuit to switch between the first state and the second state, which will be described later. The plurality of flow path switching units include, for example, a first flow path switching unit and a second flow path switching unit. The first flow path switching unit 10A has, for example, a first on-off valve 11, a second on-off valve 12, a fifth on-off valve 15, and a sixth on-off valve 16. The second flow path switching unit 10B has, for example, a third on-off valve 13 and a fourth on-off valve 14. The first flow path switching unit may have two three-way valves instead of the four on-off valves. The second flow path switching unit may have one three-way valve instead of the two on-off valves.

The refrigerant circuit includes a first flow path and a second flow path that connect the discharge port 1B of the compressor 1 and the fifth inflow / outflow portion 5A of the utilization side heat exchanger 5, and the sixth flow path of the utilization side heat exchanger 5. It has a third flow path and a fourth flow path that connect the inflow / outflow portion 5B and the suction port 1A of the compressor 1.

The first flow path connects the discharge port 1B of the compressor 1 and the fifth inflow / outflow portion 5A of the utilization side heat exchanger 5 via the auxiliary heat exchanger 3 and the heat source side heat exchanger 2. In the first flow path, the discharge port 1B of the compressor 1, the auxiliary heat exchanger 3, the heat source side heat exchanger 2, the first decompression section 4, and the fifth inflow / outflow section 5A of the utilization side heat exchanger 5 are arranged in series in this order. Be connected. In the first flow path, a first on-off valve 11 and a fifth on-off valve 15 for opening and closing the first flow path are arranged. The first on-off valve 11 is arranged between the discharge port 1B of the compressor 1 and the third inflow / outflow portion 3A of the auxiliary heat exchanger 3. The fifth on-off valve 15 is between the second inflow / outflow section 2B of the heat source side heat exchanger 2 and the first decompression section 4, and between the discharge port 1B of the compressor 1 and the first decompression section 4. Have been placed.

The second flow path connects the discharge port 1B of the compressor 1 and the fifth inflow / outflow portion 5A of the utilization side heat exchanger 5 without the intervention of the auxiliary heat exchanger 3 and the heat source side heat exchanger 2. In the second flow path, the discharge port 1B of the compressor 1 and the fifth inflow / outflow portion 5A of the heat exchanger 5 on the utilization side are connected in series. A second on-off valve 12 and a sixth on-off valve 16 for opening and closing the second flow path are arranged in the second flow path. The second on-off valve 12 is arranged between the discharge port 1B of the compressor 1 and the fifth inflow / outflow portion 5A of the user-side heat exchanger 5. The sixth on-off valve 16 is between the second inflow / outflow section 2B of the heat source side heat exchanger 2 and the fifth inflow / outflow section 5A of the utilization side heat exchanger 5, and is between the discharge port 1B of the compressor 1 and the utilization side. It is arranged between the heat exchanger 5 and the fifth inflow / outflow portion 5A.

The first flow path and the second flow path have a first branch point, a second branch point, a fifth branch point, and a sixth branch point at which the refrigerant flows or merges. In the first flow path and the second flow path, the first branch point, the second branch point, the fifth branch point, and the sixth branch point are connected in series in order. The first branch point is arranged on the upstream side of the third inflow / outflow portion 3A of the auxiliary heat exchanger 3 in the first flow path. The second branch point is arranged in the first flow path on the downstream side of the second inflow / outflow section 2B of the heat source side heat exchanger 2 and on the upstream side of the first decompression section 4. The fifth branch point is arranged on the downstream side of the second branch point and on the upstream side of the first decompression unit 4 in the first flow path. The sixth branch point is arranged on the downstream side of the first decompression unit 4 in the first flow path.

The first flow path and the second flow path connect the first branch point and the second branch point in parallel, and connect the fifth branch point and the sixth branch point in parallel. The first flow path and the second flow path are connected between the discharge port 1B of the compressor 1 and the first branch point by a common pipeline, and the sixth branch point and the user side heat exchanger 5 are connected. It is connected to the fifth inflow / outflow section 5A by a common pipeline.

From a different point of view, the second flow path has a first bypass flow path and a second bypass flow path branched from the first flow path. The first bypass flow path connects between the first branch point and the second branch point. The second bypass flow path connects between the fifth branch point and the sixth branch point. As a result, the first bypass flow path bypasses the auxiliary heat exchanger 3 and the heat source side heat exchanger 2. The second bypass flow path bypasses the first decompression unit 4. The first flow path switching unit 10A is provided so as to switch between the first flow path and the first bypass flow path. The third flow path switching unit 10C is provided so as to switch between the first flow path and the second bypass flow path. The second flow path is formed by closing the first flow path and opening the first bypass flow path and the second bypass flow path by the first flow path switching unit 10A and the third flow path switching unit 10C. Will be done.

As shown in FIGS. 1 to 3, the first flow path and the second flow path are the first common flow path C1, the second common flow path C2, and the fifth common flow path, which are composed of a common pipeline. It has road C5. Further, the first flow path has a first non-common flow path L1 and a fifth non-common flow path L5 configured by a pipeline different from the second flow path. The second flow path has a second non-common flow path L2 and a sixth non-common flow path L6 configured by a pipeline different from the first flow path.

One end of the first common flow path C1 is connected to the discharge port 1B of the compressor 1. The other end of the first common flow path C1 is connected to the first branch point. The first common flow path C1 is arranged between the discharge port 1B of the compressor 1 and the first flow path switching portion 10A.

One end of the second common flow path C2 is connected to the second branch point. The other end of the second common flow path C2 is connected to the fifth branch point. The second common flow path C2 is arranged between the second inflow / outflow section 2B and the first decompression section 4 of the heat source side heat exchanger 2 in the first flow path.

One end of the fifth common flow path C5 is connected to the sixth branch point. The other end of the fifth common flow path C5 is connected to the fifth inflow / outflow portion 5A of the utilization side heat exchanger 5. The fifth common flow path C5 is arranged between the first decompression section 4 and the fifth inflow / outflow section 5A of the utilization side heat exchanger 5 in the first flow path.

The first non-common flow path L1 and the second non-common flow path L2 are connected in parallel between the first common flow path C1 and the second common flow path C2. Each end of the first non-common flow path L1 and the second non-common flow path L2 is connected to the first branch point. The other ends of the first non-common flow path L1 and the second non-common flow path L2 are connected to the second branch point. The second non-common flow path L2 constitutes the first bypass flow path.

The fifth non-common flow path L5 and the sixth non-common flow path L6 are connected in parallel between the second common flow path C2 and the fifth common flow path C5. Each end of the fifth non-common flow path L5 and the sixth non-common flow path L6 is connected to the fifth branch point. The other ends of the fifth non-common flow path L5 and the sixth non-common flow path L6 are connected to the sixth branch point. The sixth non-common flow path L6 constitutes the second bypass flow path.

In the first flow path, the first common flow path C1, the first non-common flow path L1, the second common flow path C2, the fifth non-common flow path L5, and the fifth common flow path C5 are connected in series. .. In the second flow path, the first common flow path C1, the second non-common flow path L2, the second common flow path C2, the sixth non-common flow path L6, and the fifth common flow path C5 are connected in series. ..

The first non-common flow path L1 includes an auxiliary heat exchanger 3 and a heat source side heat exchanger 2. The fifth non-common flow path L5 includes a first decompression unit 4. That is, in the first flow path, the auxiliary heat exchanger 3, the heat source side heat exchanger 2, and the first decompression are connected between the discharge port 1B of the compressor 1 and the fifth inflow / outflow portion 5A of the utilization side heat exchanger 5. Connect via unit 4. The first non-common flow path L1 further includes a first on-off valve 11. The fifth non-common flow path L5 further includes a fifth on-off valve 15. That is, when the first on-off valve 11 and the fifth on-off valve 15 are opened, the refrigerant flows through the first flow path.

The second non-common flow path L2 does not include the auxiliary heat exchanger 3 and the heat source side heat exchanger 2. The sixth non-common flow path L6 does not include the first decompression unit 4. That is, in the second flow path, the auxiliary heat exchanger 3, the heat source side heat exchanger 2, and the first decompression are connected between the discharge port 1B of the compressor 1 and the fifth inflow / outflow portion 5A of the utilization side heat exchanger 5. Connect without going through the part 4. The second non-common flow path L2 includes a second on-off valve 12. The sixth non-common flow path L6 includes a sixth on-off valve 16. That is, when the second on-off valve 12 and the sixth on-off valve 16 are opened, the refrigerant flows through the second flow path.

The third flow path connects the sixth inflow / outflow section 5B of the utilization side heat exchanger 5 and the suction port 1A of the compressor 1 via the second decompression section 6 and the auxiliary heat exchanger 3. In the third flow path, the sixth inflow / outflow section 5B of the utilization side heat exchanger 5, the second decompression section 6, the auxiliary heat exchanger 3, and the suction port 1A of the compressor 1 are connected in series in this order. A third on-off valve 13 for opening and closing the third flow path is arranged in the third flow path. The third on-off valve 13 is arranged between the fourth inflow / outflow portion 3B of the auxiliary heat exchanger 3 and the suction port 1A of the compressor 1.

The fourth flow path connects the sixth inflow / outflow section 5B of the utilization side heat exchanger 5 and the suction port 1A of the compressor 1 without the intervention of the second decompression section 6 and the auxiliary heat exchanger 3. In the fourth flow path, the sixth inflow / outflow portion 5B of the user-side heat exchanger 5 and the suction port 1A of the compressor 1 are connected in series. A fourth on-off valve 14 for opening and closing the fourth flow path is arranged in the fourth flow path. The fourth on-off valve 14 is arranged between the sixth inflow / outflow portion 5B of the user-side heat exchanger 5 and the suction port 1A of the compressor 1.

The third flow path and the fourth flow path have a third branch point and a fourth branch point at which the refrigerant flows or merges. In the third flow path and the fourth flow path, the third branch point and the fourth branch point are connected in series in order. The third branch point is arranged on the upstream side of the second decompression unit 6 in the third flow path. The fourth branch point is arranged on the downstream side of the fourth inflow / outflow portion 3B of the auxiliary heat exchanger 3 in the third flow path.

The third flow path and the fourth flow path connect the third branch point and the fourth branch point in parallel. The third flow path and the fourth flow path are connected by a common pipeline between the sixth inflow / outflow portion 5B of the utilization side heat exchanger 5 and the third branch point, and the fourth branch point and the compressor are connected. It is connected to the suction port 1A of No. 1 by a common pipeline.

From a different point of view, the fourth flow path has a third bypass flow path branched from the third flow path. One end of the third bypass flow path is connected to the third branch point, and the other end of the third bypass flow path is connected to the fourth branch point. The second flow path switching unit 10B is provided so as to switch between the third flow path and the third bypass flow path. The fourth flow path is formed by closing the third flow path and opening the third bypass flow path by the second flow path switching unit 10B.

As shown in FIGS. 1 to 3, the third flow path and the fourth flow path have a third common flow path C3 and a fourth common flow path C4 configured by a common pipeline. Further, the third flow path has a third non-common flow path L3 formed of a conduit different from the fourth flow path. The fourth flow path has a fourth non-common flow path L4 composed of a conduit different from the third flow path.

One end of the third common flow path C3 is connected to the sixth inflow / outflow portion 5B of the utilization side heat exchanger 5. That is, the third common flow path C3 is connected to the fifth common flow path C5 via the utilization side heat exchanger 5. The other end of the third common flow path C3 is connected to the third branch point. The third common flow path C3 is arranged between the sixth inflow / outflow section 5B and the second decompression section 6 of the utilization side heat exchanger 5 in the third flow path.

One end of the fourth common flow path C4 is connected to the fourth branch point. The other end of the fourth common flow path C4 is connected to the suction port 1A of the compressor 1. The fourth common flow path C4 is arranged between the second flow path switching unit 10B and the suction port 1A of the compressor 1.

The third non-common flow path L3 and the fourth non-common flow path L4 connect the third common flow path C3 and the fourth common flow path C4 in parallel with each other. The fourth non-common flow path L4 constitutes the third bypass flow path. In the third flow path, the third common flow path C3, the third non-common flow path L3, and the fourth common flow path C4 are connected in series. In the fourth flow path, the third common flow path C3, the fourth non-common flow path L4, and the fourth common flow path C4 are connected in series.

The third non-common flow path L3 includes a second decompression unit 6 and an auxiliary heat exchanger 3. The third flow path connects the sixth inflow / outflow section 5B of the utilization side heat exchanger 5 and the suction port 1A of the compressor 1 via the second decompression section 6 and the auxiliary heat exchanger 3. The fourth non-common flow path L4 does not include the second decompression unit 6 and the auxiliary heat exchanger 3. The fourth flow path connects the sixth inflow / outflow section 5B of the utilization side heat exchanger 5 and the suction port 1A of the compressor 1 without the intervention of the second decompression section 6 and the auxiliary heat exchanger 3. The third non-common flow path L3 further includes a third on-off valve 13. The fourth non-common flow path L4 further includes a fourth on-off valve 14. That is, when the third on-off valve 13 is opened, the refrigerant flows through the third flow path, and when the fourth on-off valve 14 is opened, the refrigerant flows through the fourth flow path.

As shown in FIG. 2, in the first state, the first on-off valve 11, the fourth on-off valve 14, and the fifth on-off valve 15 are opened, and the second on-off valve 12, the third on-off valve 13, and the sixth on-off valve are opened. 16 is closed. As shown in FIG. 3, in the second state, the first on-off valve 11, the fourth on-off valve 14, and the fifth on-off valve 15 are closed, and the second on-off valve 12, the third on-off valve 13, and the sixth on-off valve are closed. The on-off valve 16 is opened.

The first non-common flow path L1 of the first flow path and the third non-common flow path L3 of the third flow path commonly include the auxiliary heat exchanger 3. That is, the first non-common flow path L1 and the third non-common flow path L3 have a sixth common flow path C6 including the auxiliary heat exchanger 3.

The refrigerant circuit further includes a plurality of rectifying units for rectifying the refrigerant. The plurality of rectifying units include a first rectifying unit 17, a second rectifying unit 18, and a third rectifying unit 19.

The first rectifying unit 17 is common to the second decompression unit 6 and the third inflow / outflow unit 3A of the auxiliary heat exchanger 3, specifically, the second decompression unit 6 and the sixth in the third non-common flow path L3. It is arranged between the flow path C6 and the flow path C6. The first rectifying unit 17 passes the refrigerant from the second decompression unit 6 toward the third inflow / outflow unit 3A of the auxiliary heat exchanger 3 and restricts the flow of the refrigerant in the opposite direction.

In the first non-common flow path L1, the second rectifying section 18 is common between the fourth inflow / outflow section 3B of the auxiliary heat exchanger 3 and the first inflow / outflow section 2A of the heat source side heat exchanger 2, specifically the sixth common flow path L1. It is arranged between the flow path C6 and the first inflow / outflow portion 2A of the heat source side heat exchanger 2. The second rectifying section 18 passes the refrigerant from the fourth inflow / outflow section 3B of the auxiliary heat exchanger 3 toward the first inflow / outflow section 2A of the heat source side heat exchanger 2 and restricts the flow of the refrigerant in the opposite direction.

The third rectifying unit 19 is arranged between the second inflow / outflow unit 2B of the heat source side heat exchanger 2 and the second branch point in the first non-common flow path L1. The third rectifying unit 19 passes the refrigerant from the second inflow / outflow unit 2B of the heat source side heat exchanger 2 toward the second common flow path C2, and restricts the flow of the refrigerant in the opposite direction.

The refrigerating apparatus 100 includes a heat source side unit 200 and a decompression unit 300 arranged outside the space to be cooled, and a utilization side unit 400 arranged inside the space to be cooled. The heat source side unit 200 is configured as a separate body from, for example, the decompression unit 300. The heat source side unit 200 is housed in the first housing. The decompression unit 300 is housed in the fifth housing. The first housing forms the outer shell of the heat source side unit 200. The fifth housing forms the outer shell of the decompression unit 300. The first housing includes a part of the refrigerant circuit including the compressor 1, the heat source side heat exchanger 2, the auxiliary heat exchanger 3, and the second decompression unit 6, and the first fan 7 and the second fan 8. It is housed inside. The fifth housing contains a part of the refrigerant circuit including the first decompression unit 4 inside. Each part of the first flow path and the second flow path, the third flow path, and the fourth flow path are arranged inside the first housing. The first flow path and the other part of the second flow path are arranged inside the fifth housing.

The user-side unit 400 includes a second housing (not shown). The second housing forms the outer shell of the user-side unit 400. The second housing houses the other part of the refrigerant circuit including the user-side heat exchanger 5 and the third fan 9 inside. A part of the refrigerant circuit arranged inside the first housing and another part of the refrigerant circuit arranged inside the second housing are connected via two pipes. ..

The heat source side unit 200 includes, for example, a first unit 500 and a second unit 600, and is configured as a connecting body in which each unit is detachably connected to each other. The first unit 500 includes, for example, a compressor 1, a heat source side heat exchanger 2, and a first fan 7. The second unit 600 includes an auxiliary heat exchanger 3, a second fan 8, a first flow path switching unit 10A, a second flow path switching unit 10B, a first rectifying unit 17, a second rectifying unit 18, and a third rectifying unit. Includes 19. The decompression unit 300 includes a first decompression unit 4 and a third flow path switching unit 10C.

The first unit 500 includes a first pipe 210A forming a part of the first common flow path C1, a second pipe 210B and a third pipe 210C forming a part of the first non-common flow path L1, and a fourth common flow path. It is connected to the second unit 600 via a total of four pipes of the fourth pipe 210D forming a part of C4. The second unit 600 is connected to the decompression unit 300 via a pipe forming a part of the second common flow path C2. The second unit 600 is connected to the user-side unit 400 via a pipe forming a part of the third common flow path C3. The decompression unit 300 is connected to the user-side unit 400 via a pipe forming a part of the fifth common flow path C5. The first unit 500 and the second unit 600 are arranged adjacent to each other, for example, but may be arranged apart from each other.

The first unit 500 further includes, for example, a third housing (not shown). The second unit 600 further includes a fourth housing (not shown). The decompression unit 300 further includes, for example, a fifth housing (not shown). The third housing houses the compressor 1, the heat source side heat exchanger 2, and the first fan 7 inside. The fourth housing includes an auxiliary heat exchanger 3, a second decompression unit 6, a second fan 8, a first flow path switching unit 10A, a second flow path switching unit 10B, a first rectifying unit 17, and a second rectifying unit 18. , And the third rectifying unit 19 is housed inside. The fifth housing internally houses the first decompression unit 4 and the third flow path switching unit 10C. The third housing and the fourth housing are housed inside the first housing.

<Operation of refrigeration equipment>
The refrigerating apparatus 100 has a cooling operation in which the space to be cooled is cooled by the utilization side heat exchanger 5 acting as an evaporator, and a defrosting operation in which the frost adhering to the utilization side heat exchanger 5 is melted and removed by the cooling operation. To switch between. When the refrigerating device 100 is in the cooling operation, the refrigerant circuit is in the first state shown in FIG. When the refrigerating apparatus 100 is in the defrosting operation, the refrigerant circuit is in the second state shown in FIG. Switching between the first state and the second state is performed by a plurality of flow path switching units.

As shown in FIG. 2, in the first state, the first on-off valve 11, the fourth on-off valve 14, and the fifth on-off valve 15 are opened, and the second on-off valve 12, the third on-off valve 13, and the sixth on-off valve are opened. The on-off valve 16 is closed. As a result, in the first state, the refrigerant flows through the first flow path and the fourth flow path, and does not flow through the second flow path and the third flow path. That is, in the first state, the refrigerant flows through the compressor 1, the auxiliary heat exchanger 3, the heat source side heat exchanger 2, the first decompression unit 4, and the utilization side heat exchanger 5 in this order, and the heat source side heat exchanger 2 and The auxiliary heat exchanger 3 acts as the first condenser, and the utilization side heat exchanger 5 acts as the first evaporator. As a result, the refrigerating apparatus 100 can cool the space to be cooled when the refrigerant circuit is in the first state.

As shown in FIG. 3, in the second state, the second on-off valve 12, the third on-off valve 13, and the sixth on-off valve 16 are opened, and the first on-off valve 11, the fourth on-off valve 14, and the fifth on-off valve are opened. The on-off valve 15 is closed. As a result, in the second state, the refrigerant flows through the second flow path and the third flow path, and does not flow through the first flow path and the fourth flow path. That is, in the second state, the refrigerant flows through the compressor 1, the utilization side heat exchanger 5, the second decompression unit 6, and the auxiliary heat exchanger 3 in this order, and the utilization side heat exchanger 5 acts as the second condenser. , The auxiliary heat exchanger 3 acts as a second evaporator. That is, when the refrigerant circuit is in the second state, the refrigerating device 100 can defrost the heat exchanger 5 on the utilization side. The second fan 8 supplies sufficient air to the auxiliary heat exchanger 3 in the first state and the second state. On the other hand, the first fan 7 is driven and stopped in, for example, the second state. Alternatively, the rotation speed of the first fan 7 in the second state is lower than that in the first state.

The third on-off valve 13 and the first rectifying unit 17 prevent the refrigerant discharged from the compressor 1 from flowing out from the sixth common flow path C6 to the third flow path in the first state. When switching from the first state to the second state, the second rectifying unit 18 sucks the high-pressure liquid-phase refrigerant on the upstream side of the first inflow / outflow unit 2A of the heat source side heat exchanger 2 into the compressor 1. To prevent. The third rectifying unit 19 prevents the refrigerant discharged from the compressor 1 from flowing out from the second flow path to the first non-common flow path L1 in the second state.

The switching from the first state to the second state and the switching from the second state to the first state are performed, for example, periodically. The switching from the first state to the second state is performed, for example, when the elapsed time from the time of switching from the immediately preceding second state to the first state reaches a predetermined time. Further, the switching from the first state to the second state may be performed when the adhesion of frost is detected in the heat exchanger 5 on the user side. For example, when frost formation is detected by a detection device, switching from the first state to the second state is performed by switching a plurality of flow path switching units based on a control signal output from the detection device. You may be broken. For example, when frost formation is detected by an operator, switching from the first state to the second state is performed by switching a plurality of flow path switching units based on a control signal input by the operator. You may.

The switching from the second state to the first state is performed, for example, when the refrigerant temperature (outlet pipe temperature) of the sixth inflow / outflow portion 5B of the user-side heat exchanger 5 becomes equal to or higher than a predetermined temperature.

<Effect>
The refrigerating device 100 includes a refrigerant circuit in which a refrigerant circulates. The refrigerant circuit includes a compressor 1, a heat source side heat exchanger 2, an auxiliary heat exchanger 3, a first decompression unit 4, a utilization side heat exchanger 5, a second decompression unit 6, and a flow path switching unit. The flow path switching unit switches between the first state and the second state. In the first state, the heat source side heat exchanger 2 and the auxiliary heat exchanger 3 act as the first condenser, the utilization side heat exchanger 5 acts as the first evaporator, and the refrigerant is the compressors 1 and 1. It flows through the condenser, the first decompression unit 4, and the first evaporator in order. In the second state, the utilization side heat exchanger 5 acts as the second condenser, the auxiliary heat exchanger 3 acts as the second evaporator, and the refrigerant is the compressor 1, the second condenser, and the second decompression unit. 6 and the second evaporator flow in order.

When the refrigerating apparatus 100 is defrosted, the refrigerant circuit is in the second state, and the auxiliary heat exchanger 3 acts as an evaporator. Therefore, unlike the conventional refrigerating apparatus provided so that only the heat exchanger on the user side flows and does not flow through other heat exchangers during the defrosting operation, the refrigerating apparatus 100 performs the defrosting operation using the refrigerating cycle. .. As a result, the defrosting operation of the refrigerating apparatus 100 is more efficient than that of the conventional refrigerating apparatus, and the defrosting operation time of the refrigerating apparatus 100 is shortened as compared with that of the conventional refrigerating apparatus.

Further, when the refrigerating apparatus 100 is cooled, the refrigerant circuit is set to the first state, and the auxiliary heat exchanger 3 acts as the first condenser together with the heat source side heat exchanger 2. Therefore, the amount of heat exchanged by the first condenser during the cooling operation can be increased in the refrigerating device 100 as compared with the conventional refrigerating device not provided with the auxiliary heat exchanger. In this case, the cooling operation of the refrigerating apparatus 100 is more efficient than that of the conventional refrigerating apparatus. Further, the power consumption of the refrigerating apparatus 100 during the cooling operation is reduced as compared with that of the conventional refrigerating apparatus.

When the refrigerating device 100 is in the defrosting operation, frost may adhere to the auxiliary heat exchanger 3 that acts as an evaporator.

On the other hand, in the first state of the refrigerating apparatus 100, the auxiliary heat exchanger 3 is arranged on the upstream side of the refrigerant circuit with respect to the heat source side heat exchanger 2. That is, in the refrigerating apparatus 100, the gas phase refrigerant (hot gas) discharged from the compressor 1 in the first state is supplied to the auxiliary heat exchanger 3. Therefore, the refrigerating device 100 can efficiently remove the frost adhering to the auxiliary heat exchanger 3 during the defrosting operation during the cooling operation.

Further, in the refrigerating apparatus 100, the refrigerant condensed in the auxiliary heat exchanger 3 in the first state is supplied to the heat source side heat exchanger 2. Therefore, the temperature rise inside the first unit 500 is suppressed in the refrigerating device 100 as compared with the case where the refrigerant discharged from the compressor 1 is supplied to the heat source side heat exchanger 2. As a result, in the refrigerating apparatus 100, for example, it is suppressed that the temperature inside the first unit 500 rises to such an extent that the control unit that controls the rotation speed of the compressor 1 malfunctions.

Further, in the refrigerating apparatus 100, since the refrigerant discharged from the compressor 1 in the first state is supplied to the auxiliary heat exchanger 3, the temperature inside the second unit 600 in the first state is relatively high. Will be done. Therefore, after switching from the first state to the second state, the auxiliary heat exchanger 3 acts as an evaporator in a relatively high temperature environment. As a result, the auxiliary heat exchanger 3 can evaporate the refrigerant with relatively high efficiency.

Further, since the refrigerating device 100 is provided with the sixth non-common flow path L6 including the sixth on-off valve 16, the first depressurization in the first flow path is compared with the refrigerating device 105 shown in FIG. 14 described later. The degree of freedom in arranging the part 4 is high. Therefore, in the refrigerating apparatus 100, the pressure loss of the refrigerant in the first state can be reduced by arranging the first decompression unit 4 near the heat exchanger 5 on the utilization side.

Further, in the refrigerating apparatus 100, the heat source side heat exchanger 2 and the auxiliary heat exchanger 3 are housed inside the first housing. Therefore, when the refrigerating apparatus 100 is in the cooling operation, the ambient temperatures of the heat source side heat exchanger 2 and the auxiliary heat exchanger 3 in the first housing are relatively high. Therefore, the auxiliary heat exchanger 3 after the refrigerating device 100 is switched from the cooling operation to the defrosting operation acts as an evaporator in a relatively high temperature environment in the first housing. Therefore, the refrigerant efficiently evaporates in the auxiliary heat exchanger 3. As a result, the defrosting efficiency of the refrigerating apparatus 100 is higher than that of the refrigerating apparatus 100 in which the heat source side heat exchanger 2 and the auxiliary heat exchanger 3 are not housed in one housing.

Embodiment 2.
As shown in FIGS. 4 to 6, the refrigerating apparatus 101 according to the second embodiment basically has the same configuration as the refrigerating apparatus 100 according to the first embodiment, but the heat source side heat in the first state. The difference is that the exchanger 2 is located upstream of the auxiliary heat exchanger 3 in the refrigerant circuit.

The refrigerant circuit of the refrigerating device 101 has a fifth flow path and a sixth flow path instead of the first flow path and the second flow path of the refrigerating device 100. The fifth flow path and the sixth flow path connect between the discharge port 1B of the compressor 1 and the fifth inflow / outflow portion 5A of the heat exchanger 5 on the utilization side. In the refrigerating device 101, the sixth inflow / outflow section 5B of the heat exchanger 5 on the utilization side and the suction port 1A of the compressor 1 are connected by a third flow path and a fourth flow path, similarly to the refrigerating device 100. ..

The fifth flow path connects the discharge port 1B of the compressor 1 and the fifth inflow / outflow portion 5A of the utilization side heat exchanger 5 via the auxiliary heat exchanger 3 and the heat source side heat exchanger 2. In the fifth flow path, the discharge port 1B of the compressor 1, the heat source side heat exchanger 2, the auxiliary heat exchanger 3, the first decompression unit 4, and the fifth inflow / outflow unit 5A of the utilization side heat exchanger 5 are arranged in series in this order. Be connected. A seventh on-off valve 21 and a fifth on-off valve 15 for opening and closing the fifth flow path are arranged in the fifth flow path. The seventh on-off valve 21 is arranged between the second inflow / outflow section 2B of the heat source side heat exchanger 2 and the third inflow / outflow section 3A of the auxiliary heat exchanger 3.

The sixth flow path connects the discharge port 1B of the compressor 1 and the fifth inflow / outflow portion 5A of the utilization side heat exchanger 5 without the intervention of the auxiliary heat exchanger 3 and the heat source side heat exchanger 2. In the sixth flow path, the discharge port 1B of the compressor 1 and the fifth inflow / outflow portion 5A of the heat exchanger 5 on the utilization side are connected in series. An eighth on-off valve 22 and a sixth on-off valve 16 for opening and closing the sixth flow path are arranged in the sixth flow path. The eighth on-off valve 22 is arranged between the discharge port 1B of the compressor 1 and the fifth inflow / outflow portion 5A of the user-side heat exchanger 5.

The fifth flow path and the sixth flow path have a seventh branch point, an eighth branch point, the fifth branch point, and the sixth branch point at which the refrigerant splits or merges. In the fifth and sixth flow paths, the seventh branch point, the eighth branch point, the fifth branch point, and the sixth branch point are connected in series in order. The seventh branch point is arranged on the upstream side of the first inflow / outflow portion 2A of the heat source side heat exchanger 2 in the first flow path. The eighth branch point is arranged in the first flow path on the downstream side of the fourth inflow / outflow section 3B of the auxiliary heat exchanger 3 and on the upstream side of the first decompression section 4.

The fifth and sixth flow paths connect the seventh branch point and the eighth branch point in parallel, and connect the fifth branch point and the sixth branch point in parallel. The fifth flow path and the sixth flow path are connected between the discharge port 1B of the compressor 1 and the seventh branch point by a common pipeline, and the sixth branch point and the heat exchanger 5 on the user side are connected. It is connected to the fifth inflow / outflow section 5A by a common pipeline.

From a different point of view, the sixth flow path has a fourth bypass flow path branched from the fifth flow path and the second bypass flow path. One end of the fourth bypass flow path is connected to the seventh branch point. The other end of the fourth bypass flow path is connected to the eighth branch point. As a result, the fourth bypass flow path bypasses the heat source side heat exchanger 2 and the auxiliary heat exchanger 3. The eighth on-off valve 22 opens and closes the fourth bypass flow path. In the sixth flow path, the fifth flow path is closed by the seventh on-off valve 21 and the fifth on-off valve 15, and the fourth bypass flow path and the second bypass flow path are closed by the eighth on-off valve 22 and the sixth on-off valve 16. It is formed by being opened.

As shown in FIGS. 4 to 6, each part of the fifth flow path and the sixth flow path is composed of a common pipeline, and each rest is composed of a different pipeline. The fifth flow path and the sixth flow path have a seventh common flow path C7, an eighth common flow path C8, and a fifth common flow path C5, which are composed of common pipelines. Further, the fifth flow path has a seventh non-common flow path L7 and a fifth non-common flow path L5 configured by a pipeline different from the sixth flow path. The sixth flow path has an eighth non-common flow path L8 and a sixth non-common flow path L6 configured by a pipeline different from the fifth flow path.

One end of the seventh common flow path C7 is connected to the discharge port 1B of the compressor 1. The other end of the seventh common flow path C7 is connected to the seventh branch point.

One end of the eighth common flow path C8 is connected to the eighth branch point. The other end of the eighth common flow path C8 is connected to the fifth branch point.

The seventh non-common flow path L7 and the eighth non-common flow path L8 connect the seventh common flow path C7 and the eighth common flow path C8 in parallel with each other. The fifth non-common flow path L5 and the sixth non-common flow path L6 connect the eighth common flow path C8 and the fifth common flow path C5 in parallel with each other. In the fifth flow path, the seventh common flow path C7, the seventh non-common flow path L7, the eighth common flow path C8, the fifth non-common flow path L5, and the fifth common flow path C5 are connected in series. .. In the sixth flow path, the seventh common flow path C7, the eighth non-common flow path L8, the eighth common flow path C8, the sixth non-common flow path L6, and the fifth common flow path C5 are connected in series. ..

The seventh non-common flow path L7 includes a heat source side heat exchanger 2 and an auxiliary heat exchanger 3. The fifth non-common flow path L5 includes a first decompression unit 4. That is, in the fifth flow path, the heat source side heat exchanger 2, the auxiliary heat exchanger 3, and the first decompression are connected between the discharge port 1B of the compressor 1 and the fifth inflow / outflow portion 5A of the utilization side heat exchanger 5. Connect via unit 4. The seventh non-common flow path L7 further includes a seventh on-off valve 21 and a fifth on-off valve 15. That is, when the 7th on-off valve 21 and the 5th on-off valve 15 are opened, the refrigerant flows through the 5th flow path.

The eighth non-common flow path L8 does not include the heat source side heat exchanger 2 and the auxiliary heat exchanger 3. The eighth non-common flow path L8 constitutes the fourth bypass flow path. That is, in the sixth flow path, the heat source side heat exchanger 2, the auxiliary heat exchanger 3, and the first decompression are connected between the discharge port 1B of the compressor 1 and the fifth inflow / outflow portion 5A of the utilization side heat exchanger 5. Connect without going through the part 4. The eighth non-common flow path L8 further includes an eighth on-off valve 22 and a sixth on-off valve 16. That is, when the 8th on-off valve 22 and the 6th on-off valve 16 are opened, the refrigerant flows through the 6th flow path.

As shown in FIGS. 4 to 6, the seventh on-off valve 21, the eighth on-off valve 22, the fifth on-off valve 15, and the sixth on-off valve 16 switch between the fifth flow path and the sixth flow path. The fourth flow path switching unit 20A provided in the above is configured.

In the first state, the seventh on-off valve 21, the fifth on-off valve 15, and the fourth on-off valve 14 are opened, and the eighth on-off valve 22, the sixth on-off valve 16, and the third on-off valve 13 are closed. In the second state, the seventh on-off valve 21, the fifth on-off valve 15, and the fourth on-off valve 14 are closed, and the eighth on-off valve 22, the sixth on-off valve 16, and the third on-off valve 13 are opened.

The seventh non-common flow path L7 of the fifth flow path and the third non-common flow path L3 of the third flow path commonly include the auxiliary heat exchanger 3. That is, the seventh non-common flow path L7 and the third non-common flow path L3 have a ninth common flow path C9 including the auxiliary heat exchanger 3.

The refrigerant circuit further includes a plurality of rectifying units for rectifying the refrigerant. The plurality of rectifying units include a first rectifying unit 17 and a fourth rectifying unit 23.

In the 7th non-common flow path L7, the 4th rectifying section 23 is located between the 4th inflow / outflow section 3B of the auxiliary heat exchanger 3 and the 8th branch point, specifically, the 9th common flow path C9 and the 9th common flow path. It is located between the 8 branch points. The fourth rectifying unit 23 passes the refrigerant from the fourth inflow / outflow unit 3B of the auxiliary heat exchanger 3 toward the eighth common flow path C8, and restricts the flow of the refrigerant in the opposite direction.

The third on-off valve 13, the fourth on-off valve 14, the fifth on-off valve 15, the sixth on-off valve 16, the first rectifying unit 17, the seventh on-off valve 21, the eighth on-off valve 22, and the fourth rectifying unit 23 are It is arranged inside the heat source side unit 201, specifically, inside the second unit 601.

In the refrigerating apparatus 101, the first unit 501 and the second unit 601 form a fifth non-common flow path L7, a fifth pipe 210E, an eighth non-common flow path L8, a sixth pipe 210F, and a fourth common flow path. It is connected via a total of three pipes of the fourth pipe 210D forming C4.

<Operation of refrigeration equipment>
As described above, the refrigerating apparatus 101 is switched between the first state shown in FIG. 5 and the second state shown in FIG. 6 by the plurality of flow path switching units.

As shown in FIG. 5, in the first state, the seventh on-off valve 21, the fourth on-off valve 14, and the fifth on-off valve 15 are opened, and the eighth on-off valve 22, the third on-off valve 13, and the sixth on-off valve are opened. The on-off valve 16 is closed. As a result, the refrigerant flows through the fifth flow path and the fourth flow path, and does not flow through the sixth flow path and the third flow path. That is, in the first state, the refrigerant flows through the compressor 1, the heat source side heat exchanger 2, the auxiliary heat exchanger 3, the first decompression unit 4, and the utilization side heat exchanger 5 in this order. The heat source side heat exchanger 2 and the auxiliary heat exchanger 3 act as the first condenser, and the utilization side heat exchanger 5 acts as the first evaporator. As a result, in the first state, the refrigerating device 101 cools the space to be cooled.

As shown in FIG. 6, in the second state, the eighth on-off valve 22, the third on-off valve 13, and the sixth on-off valve 16 are opened, and the seventh on-off valve 21, the fourth on-off valve 14, and the fifth on-off valve are opened. The on-off valve 15 is closed. As a result, the refrigerant flows through the sixth flow path and the third flow path, and does not flow through the fifth flow path and the fourth flow path. That is, in the second state, the refrigerant flows through the compressor 1, the user side heat exchanger 5, the second decompression unit 6, and the auxiliary heat exchanger 3 in this order. As a result, in the second state, the utilization side heat exchanger 5 acts as the second condenser, and the auxiliary heat exchanger 3 acts as the second evaporator. That is, when the second state is realized, the refrigerating apparatus 101 defrosts the utilization side heat exchanger 5.

The third on-off valve 13 and the first rectifying unit 17 prevent the refrigerant discharged from the compressor 1 from flowing out from the ninth common flow path C9 to the third flow path in the first state. The fourth rectifying unit 23 prevents the refrigerant discharged from the compressor 1 from flowing out from the sixth flow path to the third non-common flow path L3 in the second state.

<Effect>
Since the refrigerating apparatus 101 has basically the same configuration as the refrigerating apparatus 100, the same effect as that of the refrigerating apparatus 100 can be obtained.

Further, in the refrigerating apparatus 101, in the first state, the discharge port 1B of the compressor 1 and the first inflow / outflow portion 2A of the heat source side heat exchanger 2 are directly connected without using an on-off valve or the like. Therefore, in the refrigerating device 101, the shortest distance on the refrigerant circuit between the discharge port 1B of the compressor 1 and the condenser in the first state can be shortened as compared with that of the refrigerating device 100. In this case, the length of the pipe through which the gas phase refrigerant flows in the refrigerating device 101 is shorter than the length of the pipe through which the vapor phase refrigerant flows in the refrigerating device 100. In such a refrigerating apparatus 101, the pressure loss of the refrigerant during the cooling operation is reduced as compared with that of the refrigerating apparatus 100.

Further, in the refrigerating apparatus 101, the first unit 501 and the second unit 601 form the fifth non-common flow path L7, the fifth pipe 210E, the eighth non-common flow path L8, the sixth pipe 210F, and the fourth common flow path L8. It is connected via a total of three pipes of the fourth pipe 210D forming the flow path C4. That is, the number of pipes connecting the first unit 501 and the second unit 601 in the refrigerating device 101 is smaller than the number of pipes connecting the first unit 500 and the second unit 600 in the refrigerating device 100. Therefore, the assemblability of the heat source side unit 201 is higher than that of the heat source side unit 200.

Embodiment 3.
As shown in FIGS. 7 to 9, the refrigerating apparatus 102 according to the third embodiment has basically the same configuration as the refrigerating apparatus 100 according to the first embodiment, but has heat exchange on the heat source side in the first state. The difference is that the vessel 2 and the auxiliary heat exchanger 3 are connected in parallel with each other.

The refrigerant circuit of the refrigerating device 102 has a seventh flow path and an eighth flow path instead of the first flow path and the second flow path of the refrigerating device 100. The seventh flow path and the eighth flow path connect between the discharge port 1B of the compressor 1 and the fifth inflow / outflow portion 5A of the heat exchanger 5 on the utilization side. In the refrigerating device 102, the sixth inflow / outflow portion 5B of the heat exchanger 5 on the utilization side and the suction port 1A of the compressor 1 are connected by a third flow path and a fourth flow path, similarly to the refrigerating device 100. ..

The seventh flow path connects the discharge port 1B of the compressor 1 and the fifth inflow / outflow portion 5A of the utilization side heat exchanger 5 via the heat source side heat exchanger 2, and also via the auxiliary heat exchanger 3. The discharge port 1B of the compressor 1 and the fifth inflow / outflow portion 5A of the heat exchanger 5 on the user side are connected to each other. In the seventh flow path, the discharge port 1B of the compressor 1, the heat source side heat exchanger 2, the first decompression unit 4, and the fifth inflow / outflow unit 5A of the utilization side heat exchanger 5 are connected in series in this order, and the compressor. The discharge port 1B of No. 1, the auxiliary heat exchanger 3, the first decompression unit 4, and the fifth inflow / outflow unit 5A of the user-side heat exchanger 5 are connected in series. In other words, in the seventh flow path, the heat source side heat exchanger 2 and the auxiliary heat exchanger 3 are connected in parallel with each other.

A ninth on-off valve 31, a tenth on-off valve 32, and a fifth on-off valve 15 for opening and closing the seventh flow path are arranged in the seventh flow path. The ninth on-off valve 31 is arranged between the second inflow / outflow section 2B and the first decompression section 4 of the heat source side heat exchanger 2. The tenth on-off valve 32 is arranged between the discharge port 1B of the compressor 1 and the third inflow / outflow portion 3A of the auxiliary heat exchanger 3.

The eighth flow path connects the discharge port 1B of the compressor 1 and the fifth inflow / outflow portion 5A of the utilization side heat exchanger 5 without the heat source side heat exchanger 2 and the auxiliary heat exchanger 3. In the eighth flow path, the discharge port 1B of the compressor 1 and the fifth inflow / outflow portion 5A of the heat exchanger 5 on the utilization side are connected in series in order.

In the eighth flow path, an eleventh on-off valve 33 and a sixth on-off valve 16 for opening and closing the eighth flow path are arranged. The eleventh on-off valve 33 is arranged between the discharge port 1B of the compressor 1 and the third inflow / outflow section 3A of the fifth inflow / outflow section 5A of the utilization side heat exchanger 5.

The 7th and 8th flow paths include the 9th branch point, the 10th branch point, the 5th branch point, the 11th branch point, the 12th branch point, and the 6th branch point at which the refrigerant splits or merges. Have. In the 7th and 8th flow paths, the 9th branch point, the 10th branch point, the 5th branch point, and the 6th branch point are connected in series in order. In the 7th flow path, the 9th branch point, the 12th branch point, the 10th branch point, the 5th branch point, and the 6th branch point are connected in series in order, and the 9th branch point and the 11th branch point are connected in order. , 12th branch point, 10th branch point, 5th branch point, and 6th branch point are connected in series in this order.

The ninth branch point is arranged on the upstream side of the first inflow / outflow portion 2A of the heat source side heat exchanger 2 and the third inflow / outflow portion 3A of the auxiliary heat exchanger 3 in the seventh flow path. The tenth branch point is on the downstream side of the second inflow / outflow section 2B of the heat source side heat exchanger 2 and the fourth inflow / outflow section 3B of the auxiliary heat exchanger 3 and on the upstream side of the first decompression section 4 in the seventh flow path. Have been placed. The eleventh branch point is arranged on the downstream side of the ninth branch point and on the upstream side of the third inflow / outflow portion 3A of the auxiliary heat exchanger 3 in the seventh flow path. The twelfth branch point is arranged on the downstream side of the second inflow / outflow section 2B of the heat source side heat exchanger 2 and the fourth inflow / outflow section 3B of the auxiliary heat exchanger 3 and on the upstream side of the tenth branch point in the seventh flow path. Has been done.

From a different point of view, the eighth flow path has a seventh bypass flow path branched from the seventh flow path and the second bypass flow path. One end of the 7th bypass flow path is connected to the 11th branch point. The other end of the 7th bypass flow path is connected to the 10th branch point. As a result, the seventh bypass flow path bypasses the auxiliary heat exchanger 3 and the heat source side heat exchanger 2. The eleventh on-off valve 33 opens and closes the seventh bypass flow path. The seventh flow path is closed by the ninth on-off valve 31, the tenth on-off valve 32, and the fifth on-off valve 15, and the seventh bypass flow path is closed by the eleventh on-off valve 33 and the sixth on-off valve 16. And it is formed by opening the second bypass flow path.

As shown in FIGS. 7 to 9, each part of the 7th flow path and the 8th flow path is composed of a common pipeline, and each rest is composed of a different pipeline. The seventh flow path and the eighth flow path have a tenth common flow path C10, an eleventh common flow path C11, a twelfth common flow path C12, and a fifth common flow path C5, which are composed of common pipelines. is doing. Further, the 7th flow path has a 9th non-common flow path L9, a 10th non-common flow path L10, and a 5th non-common flow path L5 which are composed of a pipeline different from the 8th flow path. The eighth flow path has an eleventh non-common flow path L11 and a sixth non-common flow path L6 configured by a pipeline different from the seventh flow path.

One end of the tenth common flow path C10 is connected to the discharge port 1B of the compressor 1. The other end of the tenth common flow path C10 is connected to each one end of the ninth non-common flow path L9 and the eleventh common flow path C11, that is, the ninth branch point. The tenth common flow path C10 is located between the discharge port 1B of the compressor 1 and the first inflow / outflow portion 2A of the heat source side heat exchanger 2 in the seventh flow path, and the discharge port 1B of the compressor 1 and the auxiliary heat exchanger. It is arranged between the third inflow / outflow portion 3A of No. 3 and the third inflow / outflow portion 3A.

One end of the eleventh common flow path C11 is connected to the other end of the tenth common flow path C10 and the other end of the ninth non-common flow path L9. The other end of the 11th common flow path C11 is connected to each end of the 10th non-common flow path L10 and the 11th non-common flow path L11, that is, the 11th branch point. The eleventh common flow path C11 is arranged between the discharge port 1B of the compressor 1 and the third inflow / outflow portion 3A of the auxiliary heat exchanger 3 in the seventh flow path.

One end of the twelfth common flow path C12 is connected to the other ends of the ninth non-common flow path L9, the tenth non-common flow path L10, and the eleventh non-common flow path L11, that is, the tenth branch point. The other end of the twelfth common flow path C12 is connected to the fifth branch point of the fifth non-common flow path L5 and the sixth non-common flow path L6. The twelfth common flow path C12 is located between the second inflow / outflow section 2B of the heat source side heat exchanger 2 and the first decompression section 4 in the seventh flow path, and the fourth inflow / outflow section 3B and the first of the auxiliary heat exchanger 3. It is arranged between the pressure reducing unit 4 and the pressure reducing unit 4.

The ninth non-common flow path L9, the tenth non-common flow path L10, and the eleventh non-common flow path L11 are connected in parallel between the tenth common flow path C10 and the twelfth common flow path C12. .. Further, the tenth non-common flow path L10 and the eleventh non-common flow path L11 connect the eleventh common flow path C11 and the twelfth common flow path C12 in parallel with each other. The fifth non-common flow path L5 and the sixth non-common flow path L6 connect the twelfth common flow path C12 and the fifth common flow path C5 in parallel with each other. In the seventh flow path, the tenth common flow path C10, the ninth non-common flow path L9, the twelfth common flow path C12, the fifth non-common flow path L5, and the fifth common flow path C5 are connected in series. The tenth common flow path C10, the eleventh common flow path C11, the tenth non-common flow path L10, the twelfth common flow path C12, the fifth non-common flow path L5, and the fifth common flow path C5 are connected in series. Has been done. In the eighth flow path, the tenth common flow path C10, the eleventh common flow path C11, the eleventh non-common flow path L11, the twelfth common flow path C12, the sixth non-common flow path L6, and the fifth common flow path C5. Are connected in series.

The ninth non-common flow path L9 includes a heat source side heat exchanger 2. The tenth non-common flow path L10 includes an auxiliary heat exchanger 3. That is, the seventh flow path connects the discharge port 1B of the compressor 1 and the fifth inflow / outflow section 5A of the utilization side heat exchanger 5 via the heat source side heat exchanger 2 and the first decompression section 4. At the same time, they are connected via the auxiliary heat exchanger 3 and the first decompression unit 4.

The eleventh non-common flow path L11 does not include the heat source side heat exchanger 2 and the auxiliary heat exchanger 3. The eleventh non-common flow path L11 constitutes the seventh bypass flow path. That is, in the eighth flow path, the heat source side heat exchanger 2, the auxiliary heat exchanger 3, and the first decompression are connected between the discharge port 1B of the compressor 1 and the fifth inflow / outflow portion 5A of the utilization side heat exchanger 5. Connect without going through the part 4.

The ninth non-common flow path L9 further includes a ninth on-off valve 31. The tenth non-common flow path L10 further includes a tenth on-off valve 32. The eleventh non-common flow path L11 further includes an eleventh on-off valve 33.

The ninth non-common flow path L9 and the tenth non-common flow path L10 of the seventh flow path have a thirteenth common flow path C13 composed of a common pipeline. One end of the thirteenth common flow path C13 is connected to the twelfth branch point which is a confluence of the ninth non-common flow path L9 and the tenth non-common flow path L10. The other end of the thirteenth common flow path C13 is connected to the tenth branch point. The ninth on-off valve 31 is provided on, for example, the thirteenth common flow path C13.

As shown in FIGS. 7 to 9, the ninth on-off valve 31, the tenth on-off valve 32, the eleventh on-off valve 33, the fifth on-off valve 15, and the sixth on-off valve 16 are the seventh flow path and the eighth. It constitutes a fifth switching unit provided to switch between the flow path and the flow path.

In the first state, the ninth on-off valve 31, the tenth on-off valve 32, the fifth on-off valve 15, and the third on-off valve 13 are opened, and the eleventh on-off valve 33, the sixth on-off valve 16, and the fourth on-off valve are opened. 14 is closed. In the second state, the ninth on-off valve 31, the tenth on-off valve 32, the fifth on-off valve 15, and the third on-off valve 13 are closed, and the eleventh on-off valve 33, the sixth on-off valve 16, and the fourth on-off valve are closed. 14 is released.

The ninth non-common flow path L9 of the seventh flow path and the third non-common flow path L3 of the third flow path commonly include the auxiliary heat exchanger 3. That is, the ninth non-common flow path L9 and the third non-common flow path L3 have a 14th common flow path C14 including the auxiliary heat exchanger 3.

The refrigerant circuit further includes a plurality of rectifying units for rectifying the refrigerant. The plurality of rectifying units include a first rectifying unit 17, a fifth rectifying unit 34, and a sixth rectifying unit 35.

In the 10th non-common flow path L10, the 5th rectifying section 34 is located between the 4th inflow / outflow section 3B of the auxiliary heat exchanger 3 and the confluence portion of the 9th non-common flow path L9 and the 10th non-common flow path L10. Is located in. The fifth rectifying unit 34 passes the refrigerant from the fourth inflow / outflow unit 3B of the auxiliary heat exchanger 3 toward the thirteenth common flow path C13, and restricts the flow of the refrigerant in the opposite direction.

The sixth rectifying section 35 is arranged between the second inflow / outflow section 2B of the heat source side heat exchanger 2 and the eleventh branch point in the ninth non-common flow path L9. The sixth rectifying unit 35 passes at least the refrigerant from the second inflow / outflow unit 2B of the heat source side heat exchanger 2 toward the twelfth common flow path C12, and restricts the flow of the refrigerant in the opposite direction. The sixth rectifying unit 35 is provided on, for example, the thirteenth common flow path C13. The sixth rectifying unit 35 connects the refrigerant from the second inflow / outflow section 2B of the heat source side heat exchanger 2 to the twelfth common flow path C12, and the fourth inflow / outflow section 3B of the auxiliary heat exchanger 3 to the twelfth common flow path C12. It passes the oncoming refrigerant and restricts the flow of the refrigerant in each opposite direction.

9th on-off valve 31, 10th on-off valve 32, 11th on-off valve 33, 5th on-off valve 15, 6th on-off valve 16, 3rd on-off valve 13, 4th on-off valve 14, 1st rectifying unit 17, 5th The rectifying unit 34 and the sixth rectifying unit 35 are arranged inside the heat source side unit 202, specifically, inside the second unit 602.

In the refrigerating apparatus 102, the first unit 502 and the second unit 602 form the tenth non-common flow path L10, the eighth pipe 210H, the ninth non-common flow path L9, the ninth pipe 210I, and the fourth common flow path. It is connected via a total of three pipes of the tenth pipe 210J forming C4.

<Operation of refrigeration equipment>
As described above, the refrigerating apparatus 102 is switched between the first state shown in FIG. 8 and the second state shown in FIG. 9 by the plurality of flow path switching units.

As shown in FIG. 8, in the first state, the ninth on-off valve 31, the tenth on-off valve 32, the fifth on-off valve 15, and the third on-off valve 13 are opened, and the eleventh on-off valve 33 and the sixth on-off valve 33 are opened. The valve 16 and the fourth on-off valve 14 are closed. As a result, the refrigerant flows through the 7th flow path and the 4th flow path, and does not flow through the 8th flow path and the 3rd flow path. That is, in the first state, the refrigerant flows through the compressor 1, the heat source side heat exchanger 2, the first decompression unit 4, and the user side heat exchanger 5 in this order, and the compressor 1, the auxiliary heat exchanger 3, and the first. It flows through the decompression unit 4 and the heat exchanger 5 on the user side in order. The heat source side heat exchanger 2 and the auxiliary heat exchanger 3 act as the third condenser, and the utilization side heat exchanger 5 acts as the third evaporator. As a result, in the first state, the refrigerating device 102 cools the space to be cooled.

As shown in FIG. 9, in the second state, the ninth on-off valve 31, the tenth on-off valve 32, the fifth on-off valve 15, and the third on-off valve 13 are closed, and the eleventh on-off valve 33 and the sixth on-off valve 33 and the sixth on-off valve are closed. The valve 16 and the fourth on-off valve 14 are opened. As a result, the refrigerant flows through the eighth flow path and the third flow path, and does not flow through the seventh flow path and the fourth flow path. That is, in the second state, the refrigerant flows through the compressor 1, the user side heat exchanger 5, the second decompression unit 6, and the auxiliary heat exchanger 3 in this order. As a result, in the second state, the utilization side heat exchanger 5 acts as the second condenser, and the auxiliary heat exchanger 3 acts as the second evaporator. That is, when the second state is realized, the refrigerating apparatus 102 defrosts the utilization side heat exchanger 5.

<Effect>
Since the refrigerating apparatus 102 has basically the same configuration as the refrigerating apparatus 100, the same effect as that of the refrigerating apparatus 100 can be obtained.

Further, in the refrigerating apparatus 102, the heat source side heat exchanger 2 and the auxiliary heat exchanger 3 are connected in parallel to the discharge port 1B of the compressor 1 when the refrigerant circuit is in the first state. Therefore, in the refrigerating device 102, the pressure loss of the refrigerant during the cooling operation is reduced as compared with the refrigerating devices 100 and 101.

Further, in the refrigerating apparatus 102, the first unit 502 and the second unit 602 are connected via three pipes. Therefore, the number of pipes connecting the first unit 502 and the second unit 602 in the refrigerating device 102 is smaller than the number of pipes connecting the first unit 500 and the second unit 600 in the refrigerating device 100. Therefore, the assemblability of the heat source side unit 202 is higher than that of the heat source side unit 200.

Embodiment 4.
As shown in FIGS. 10 to 12, the refrigerating apparatus 103 according to the fourth embodiment has basically the same configuration as the refrigerating apparatus 100 according to the first embodiment, but is a heat medium circuit in which a heat medium circulates. The difference is that the heat source side heat exchanger 2 is provided so as to exchange heat between the refrigerant circulating in the refrigerant circuit and the heat medium circulating in the heat medium circuit.

The heat medium circuit is arranged inside the heat source side unit 203, specifically, inside the first unit 503. The heat medium circulating in the heat medium circuit is, for example, a refrigerant. The refrigerating device 103 is configured as a so-called dual refrigerating device, in which the refrigerant circuit forms a low temperature side circuit and the heat medium circuit forms a high temperature side circuit. The heat medium circuit includes a high temperature side compressor 51, a high temperature side condenser 52, a high temperature side decompression unit 53, and a heat source side heat exchanger 2 that acts as a high temperature side evaporator. The heat medium flows through the high temperature side compressor 51, the high temperature side condenser 52, the high temperature side decompression unit 53, and the heat source side heat exchanger 2 in this order. Each of the second unit 600, the decompression unit 300, and the utilization side unit 400 has the same configuration as each of the second unit 600, the decompression unit 300, and the utilization side unit 400 of the refrigerating apparatus 100.

The high temperature side compressor 51 compresses and discharges the heat medium evaporated in the heat source side heat exchanger 2. In the high temperature side condenser 52, heat exchange is performed between the heat medium discharged from the high temperature side compressor 51 and air. Inside the first unit 503, a fourth fan 54 that supplies air outside the freezer to the high temperature side condenser 52 is arranged in place of the first fan 7 in the first unit 500. The high temperature side pressure reducing unit 53 is, for example, an electronic expansion valve.

The heat source side heat exchanger 2 is, for example, a plate type heat exchanger. The heat source side heat exchanger 2 further has a seventh inflow / outflow section 2C and an eighth inflow / outflow section 2D into which the heat medium flows in and out. The seventh inflow / outflow section 2C is connected to the high temperature side condenser 52 via the high temperature side decompression section 53. The eighth inflow / outflow section 2D is connected to the suction port of the high temperature side compressor 51.

The first unit 503 and the second unit 600 are housed in the same housing, for example. In this case, the auxiliary heat exchanger 3 and the high temperature side condenser 52 may be provided as one, for example. From a different point of view, a part region of one heat exchanger may constitute the auxiliary heat exchanger 3, and the other region of the one heat exchanger may constitute the high temperature side condenser 52.

<Operation of refrigeration equipment>
In the refrigerating apparatus 103, the first state shown in FIG. 11 and the second state shown in FIG. 12 are switched by the plurality of flow path switching units. As shown in FIGS. 11 and 12, the switching between the first state and the second state in the refrigerating apparatus 103 is performed in the same manner as the switching between the eleventh state and the second state in the refrigerating apparatus 100.

As shown in FIG. 11, when the refrigerant circuit is in the first state, each of the refrigerant in the refrigerant circuit and the heat medium in the heat medium circuit repeats the refrigeration cycle. In the first state, the refrigerant flows through the compressor 1, the auxiliary heat exchanger 3, the heat source side heat exchanger 2, the first decompression unit 4, and the utilization side heat exchanger 5 in this order, and the heat medium is the high temperature side compressor 51. The high temperature side condenser 52, the high temperature side decompression unit 53, and the heat source side heat exchanger 2 flow in this order. As a result, in the first state, heat exchange between the refrigerant and the heat medium is performed in the heat source side heat exchanger 2, the refrigerant is condensed, and the heat medium evaporates. As a result, in the first state, the heat source side heat exchanger 2 and the auxiliary heat exchanger 3 act as the first condenser, the utilization side heat exchanger 5 acts as the first evaporator, and the refrigerating device 103 is the object to be cooled. It is possible to cool the space to be used.

As shown in FIG. 12, when the refrigerant circuit is in the second state, only the refrigerant in the refrigerant circuit circulates in the refrigerant circuit and repeats the refrigeration cycle, and the heat medium in the heat medium circuit is the heat medium. Do not circulate in the circuit and do not repeat the refrigeration cycle. That is, when the refrigerant circuit is in the second state, the refrigerating device 103 operates in the same manner as the refrigerating device 100 to defrost the heat exchanger 5 on the utilization side.

<Effect>
Since the refrigerating apparatus 103 has basically the same configuration as the refrigerating apparatus 100, the same effect as that of the refrigerating apparatus 100 can be obtained.

Further, since the refrigerating apparatus 103 is configured as a dual refrigerating apparatus, the cooling efficiency is improved as compared with the refrigerating apparatus operating in a single refrigerating cycle. From a different point of view, in the refrigerating apparatus 103, the auxiliary heat exchanger 3 acts as a condenser in the refrigerant circuit, so that the cooling efficiency of the refrigerating apparatus 103 is different from that of the conventional dual refrigerating apparatus not provided with the auxiliary heat exchanger 3. Compared to, it is enhanced. Further, the refrigerating apparatus 103 has higher defrosting efficiency as compared with the conventional dual refrigerating apparatus.
<Modification example>
The refrigerating device 104 shown in FIG. 13 is a modification of the refrigerating device 103 shown in FIGS. 10 to 12. The refrigerating apparatus 104 has basically the same configuration as the refrigerating apparatus 103, except that the heat medium circulating in the heat medium circuit is water, brine, or the like. The heat medium in the refrigerator 104 does not undergo a phase change as it circulates in the heat medium circuit. The heat medium circuit has a pump 55 in place of the high temperature side compressor 51 shown in FIGS. 10 to 12 and a heat exchanger 56 in place of the high temperature side condenser 52. The pump 55 circulates the heat medium in the heat medium circuit. The heat exchanger 56 is provided so as to exchange heat between the heat medium circulating in the heat medium circuit and the air outside the freezer. As described above, the auxiliary heat exchanger 3 is provided so as to exchange heat between the refrigerant circulating in the refrigerant circuit and the air outside the freezer. Therefore, in the refrigerating device 104 as well, the first state and the second state are realized as in the refrigerating device 100. As a result, the refrigerating device 104 can exert the same effect as the refrigerating device 100.

Further, when the auxiliary heat exchanger 3 is provided to exchange heat between the refrigerant circulating in the refrigerant circuit and the refrigerant circulating in the heat medium circuit, the auxiliary heat exchanger 3 during the defrosting operation may be used. The heat medium may exchange heat with the refrigerant condensed in the user side heat exchanger 5 and freeze. On the other hand, in the refrigerating apparatus 104, since the refrigerant condensed in the utilization side heat exchanger 5 is not supplied to the heat source side heat exchanger 2, freezing of the heat medium is suppressed even during the defrosting operation. In the refrigerating apparatus 104 as well, similarly to the refrigerating apparatus 100, frost may adhere to the auxiliary heat exchanger 3 by the defrosting operation on the user side heat exchanger 5, but this frost can be melted and removed by the cooling operation.

The refrigerant circuits of the refrigerating devices 103 and 104 may have the same configuration as the refrigerant circuits of the refrigerating device 101 or the refrigerating device 102. The heat medium circuit of the refrigerating devices 103 and 104 may include the refrigerating device 101 or the heat source side heat exchanger 2 of the refrigerating device 102.

The refrigerating device 105 shown in FIG. 14 is a modification of the refrigerating device 100 shown in FIGS. 1 to 3. In the refrigerating apparatus 105, the second flow path has only one bypass flow path, that is, only the second non-common flow path L2. From a different point of view, in the refrigerating apparatus 105, the first flow path and the second flow path do not have the second common flow path C2, the second branch point, and the fifth branch point. In this case, one end of the second non-common flow path L2 is connected to the first branch point as in the refrigeration apparatus 100. The other end of the second non-common flow path L2 is connected to the downstream side of the first decompression section 4 and upstream of the fifth inflow / outflow section 5A of the utilization side heat exchanger 5 in the first flow path. The second non-common flow path L2 is provided so as to bypass the auxiliary heat exchanger 3, the heat source side heat exchanger 2, and the first decompression unit 4. In the refrigerating apparatus 105, the sixth on-off valve 16 is not required.

The refrigerating devices 101, 102, 103, and 104 can also be modified in the same manner as the refrigerating device 105.

The refrigerating device 106 shown in FIGS. 15 and 16 is a modification of the refrigerating device 100 shown in FIGS. 1 to 3. The refrigerating device 106 further includes an economizer circuit in which the refrigerant circulates. The economizer circuit includes a compressor 1, a heat source side heat exchanger 2, an economizer flow path 60, an economizer heat exchanger 61, an economizer decompression unit 62, a fifth bypass flow path 63, and a twelfth on-off valve 64.

The compressor 1 includes, for example, a low pressure portion, a high pressure portion, and an intermediate pressure portion arranged between the low pressure portion and the high pressure portion. The economizer flow path 60 is branched from the first flow path of the refrigerant circuit. One end of the economizer flow path 60 is connected between the second inflow / outflow portion 2B of the heat source side heat exchanger 2 and the second branch point. The other end of the economizer flow path 60 is connected to, for example, the intermediate pressure portion of the compressor 1. As a result, the economizer circuit causes a part of the refrigerant condensed by the heat source side heat exchanger 2 to flow into the intermediate pressure portion of the compressor 1. The economizer decompression unit 62 decompresses the refrigerant that has been condensed by the heat source side heat exchanger 2 and then flows into the economizer flow path. The economizer heat exchanger 61 exchanges heat between the refrigerant decompressed by the economizer decompression unit 62 and the refrigerant condensed by the heat source side heat exchanger 2 and then flowing toward the utilization side heat exchanger 5. It is provided. The economizer circuit is included in the heat source side unit 206. The compressor 1, the heat source side heat exchanger 2, the economizer flow path 60, the economizer heat exchanger 61, and the economizer decompression unit 62 are included in the first unit 506.

The fifth bypass flow path 63 is provided so as to bypass the first on-off valve 11, the auxiliary heat exchanger 3, and the second rectifying unit 18 in the first flow path. One end of the fifth bypass flow path 63 is connected between the first branch point and the first on-off valve 11 in the first non-common flow path L1. The other end of the fifth bypass flow path 63 is connected between the second rectifying section 18 and the first inflow / outflow section 2A of the heat source side heat exchanger 2 in the first non-common flow path L1. The twelfth on-off valve 64 opens and closes the fifth bypass flow path 63. The fifth bypass flow path 63 and the twelfth on-off valve 64 are included in the second unit 606.

The economizer circuit includes a portion located between the discharge port 1B of the compressor 1 and the one end of the fifth bypass flow path 63, and the other end of the fifth bypass flow path 63 and the one end of the economizer flow path 60. The portion located between them is shared with the first flow path of the refrigerant circuit.

From a different point of view, the refrigerant circuit of the refrigerating apparatus 106 further includes an economizer flow path 60 and a fifth bypass flow path 63. When the refrigerant circuit is in the first state, the first common flow path C1, the portion of the first non-common flow path L1 located between the first branch point and the one end of the economizer flow path 60, and the economizer flow path 60. However, it constitutes an economizer circuit. When the refrigerant circuit is in the second state, a portion of the first common flow path C1 and the first non-common flow path L1 located between the first branch point and the one end of the fifth bypass flow path 63 and the fifth bypass. A portion located between the other end of the flow path 63 and the one end of the economizer flow path 60, the fifth bypass flow path 63, and the economizer flow path 60 form an economizer circuit. The economizer circuit of the refrigerating apparatus 106 may be configured to return a part of the refrigerant condensed by the heat source side heat exchanger 2 to the compressor 1. The other end of the economizer flow path 60 may be connected to the low pressure portion of the compressor 1 or the suction port 1A. The configuration of the compressor 1 in the refrigerating apparatus 106 is not particularly limited, and may be, for example, a multi-stage compressor or, for example, a single-stage compressor.

As shown in FIG. 15, when the refrigerating device 106 is in the cooling operation, the first on-off valve 11, the fourth on-off valve 14, and the fifth on-off valve 15 are opened, and the second on-off valve 12, the third on-off valve, and the third on-off valve are opened. 13, the sixth on-off valve 16, and the twelfth on-off valve 64 are closed. As a result, the refrigerant discharged from the compressor 1 is the heat source side heat exchanger 2 as the first condenser, the auxiliary heat exchanger 3, the first decompression unit 4, and the utilization side heat exchanger as the first evaporator. 5 flows in order, and the rest of the refrigerant discharged from the compressor 1 flows in order through the heat source side heat exchanger 2 and the economizer flow path 60. As a result, the cooling operation of the refrigerating apparatus 106 is further improved in efficiency as compared with that of the conventional refrigerating apparatus by utilizing the economizer circuit.

As shown in FIG. 16, when the refrigerating apparatus 106 is in the defrosting operation, the second on-off valve 12, the third on-off valve 13, the sixth on-off valve 16, and the twelfth on-off valve 64 are opened, and the first on-off valve 64 is opened. The on-off valve 11, the fourth on-off valve 14, and the fifth on-off valve 15 are closed. As a result, when the refrigerating device 106 is in the defrosting operation, a part of the refrigerant discharged from the compressor 1 is used as the second condenser, the heat exchanger 5, the second decompression unit 6, and the second. At the same time, the remaining amount of the refrigerant discharged from the compressor 1 flows through the fifth bypass flow path 63, the heat source side heat exchanger 2, and the economizer flow path 60 in order. That is, when the refrigerant circuits of the refrigerating devices 100 to 105 are in the second state, the heat source side heat exchanger 2 does not act as a condenser, whereas when the refrigerant circuit of the refrigerating device 106 is in the second state, The heat source side heat exchanger 2 acts as a condenser. In the defrosting operation of the refrigerating apparatus 106, in order to increase the amount of heat used for defrosting in the utilization side heat exchanger 5, the amount of heat exchanged in the heat source side heat exchanger 2 is the heat exchange in the auxiliary heat exchanger 3. It is preferably reduced compared to the amount. Therefore, the rotation speed of the first fan 7 when the refrigerating device 106 is in the defrosting operation is the rotation speed of the second fan 8 when the refrigerating device 106 is in the defrosting operation, and the refrigerating device 106 is in the cooling operation. It is preferable that the rotation speed of the first fan 7 is reduced as compared with the rotation speed of the first fan 7.

When the refrigerating apparatus 106 is defrosted, the refrigerant flows through the first flow path and the economizer flow path 60, but the heat exchange amount in the heat source side heat exchanger 2 is sufficiently small, so that the heat exchange on the utilization side is performed. The amount of heat used for defrosting in the vessel 5 is sufficiently large. Further, the defrosting operation of the refrigerating apparatus 100 also uses a refrigerating cycle, unlike the conventional refrigerating apparatus provided so that only the heat exchanger on the user side flows and does not flow through other heat exchangers during the defrosting operation. .. As a result, the defrosting operation of the refrigerating apparatus 106 is more efficient than that of the conventional refrigerating apparatus.

As shown in FIG. 17, the economizer circuit of the refrigerating apparatus 106 may include a capillary tube 65 instead of the twelfth on-off valve 64. The capillary pipe 65 is arranged in the fifth bypass flow path 63. The pressure loss of the refrigerant in the capillary pipe 65 is higher than the pressure loss of the refrigerant in the auxiliary heat exchanger 3. The capillary pipe 65 is provided so that the flow rate of the refrigerant flowing through the fifth bypass flow path 63 does not affect the cooling performance of the refrigerating apparatus 106 when the refrigerant circuit is in the first state. In other words, the flow rate of the refrigerant flowing through the fifth bypass flow path 63 is set to be less than the minimum flow rate that can affect the cooling performance of the refrigerating apparatus 106. In this case, the capillary pipe 65 substantially shuts off the flow of the refrigerant in the fifth bypass flow path 63 when the first on-off valve 11 is opened, and the fifth bypass flow when the first on-off valve 11 is closed. The refrigerant is circulated in the road 63. As a result, the refrigerating device 106 provided with the capillary pipe 65 can exert the same effect as the refrigerating device 106 provided with the twelfth on-off valve 64. The refrigerating devices 101 to 105 can also be modified in the same manner as the refrigerating device 106.

The refrigerating device 107 shown in FIG. 18 is a modification of the refrigerating device 100 shown in FIGS. 1 to 3. In the refrigerating apparatus 107, a plurality of compressors 1 are connected in parallel to each other in the first flow path and the second flow path. Further, a plurality of heat source side heat exchangers 2 are connected in parallel to each other in the first flow path. Since such a freezing device 107 also has basically the same configuration as the freezing device 100, the same effect as that of the freezing device 100 can be obtained. The refrigerating devices 101 to 106 can also be modified in the same manner as the refrigerating device 107.

In the refrigerating devices 100 to 107, the decompression unit 300 may be arranged outside the first housing. The decompression unit 300 may be arranged in the space to be cooled together with the user side unit 400, for example. Further, the decompression unit 300 may be configured integrally with the user side unit 400.

Further, in the refrigerating devices 100 to 107, the heat source side units 200 to 207 may include a decompression unit 300. The decompression unit 300 is configured as, for example, integrally or separately from the first units 500 to 507 and the second units 600 to 605 in the heat source side units 200 to 207, and is arranged inside the first housing.

Although the embodiment of the present invention has been described above, it is possible to modify the above-described embodiment in various ways. Moreover, the scope of the present invention is not limited to the above-described embodiment. The scope of the present invention is indicated by the claims and is intended to include all modifications within the meaning and scope equivalent to the claims.

1 Compressor, 1A Suction port, 1B Discharge port, 2 Heat source side heat exchanger, 2A 1st inflow / outflow section, 2B 2nd inflow / outflow section, 2C 7th inflow / outflow section, 2D 8th inflow / outflow section, 3 Auxiliary heat exchanger, 3A 3rd inflow / outflow section, 3B 4th inflow / outflow section, 4th 1st decompression section, 5 user side heat exchanger, 5A 5th inflow / outflow section, 5B 6th inflow / outflow section, 6th 2nd decompression section, 7th 1st fan, 8th 2nd Fan, 9 3rd fan, 10A 1st flow path switching unit, 10B 2nd flow path switching unit, 10C 3rd flow path switching unit, 11 1st on-off valve, 12 2nd on-off valve, 13 3rd on-off valve, 14 4th on-off valve, 15 5th on-off valve, 16 6th on-off valve, 17 1st rectifying section, 18 2nd rectifying section, 19 3rd rectifying section, 20A 4th flow path switching section, 21 7th on-off valve, 22 8th on-off valve, 23 4th rectifying unit, 31 9th on-off valve, 32 10th on-off valve, 33 11th on-off valve, 34 5th rectifying unit, 35 6th rectifying unit, 51 high temperature side compressor, 52 high temperature side Condenser, 53 High temperature side decompression section, 54 4th fan, 55 pump, 56 heat exchanger, 60 economizer flow path, 61 economizer heat exchanger, 62 economizer decompression section, 63 5th bypass flow path, 64 12th on-off valve , 65 Economizer, 100, 101, 102, 103, 104, 105, 106, 107 Refrigeration equipment, 200, 201, 202 Heat source side unit, 210A 1st pipe, 210B 2nd pipe, 210C 3rd pipe, 210D 4th Pipe, 210E 5th pipe, 210F 6th pipe, 210H 8th pipe, 210I 9th pipe, 210J 10th pipe, 300 User side unit, 400, 401, 402, 403 1st unit, 500, 501, 502, 503 2nd unit, 600 3rd unit.

It is a figure which shows the refrigerating apparatus and the heat source side unit which concerns on Embodiment 1. FIG. It is a figure which shows the 1st state of the refrigerating apparatus and a heat source side unit shown in FIG. It is a figure which shows the 2nd state of the refrigerating apparatus and a heat source side unit shown in FIG. It is a figure which shows the refrigerating apparatus and the heat source side unit which concerns on Embodiment 2. It is a figure which shows the 1st state of the refrigerating apparatus and a heat source side unit shown in FIG. It is a figure which shows the 2nd state of the refrigerating apparatus and a heat source side unit shown in FIG. It is a figure which shows the refrigerating apparatus and the heat source side unit which concerns on Embodiment 3. It is a figure which shows the 1st state of the refrigerating apparatus and a heat source side unit shown in FIG. 7. It is a figure which shows the 2nd state of the refrigerating apparatus and a heat source side unit shown in FIG. 7. It is a figure which shows the refrigerating apparatus and the heat source side unit which concerns on Embodiment 4. Is a diagram illustrating a first state of the refrigeration system and the heat source side unit shown in FIG. 10. It is a diagram showing a second state of the refrigeration system and the heat source side unit shown in FIG. 10. It is a figure which shows the modification of the refrigerating apparatus and the heat source side unit which concerns on Embodiment 4. FIG. It is a figure which shows the other modification of the refrigerating apparatus and the heat source side unit which concerns on Embodiment 1. FIG. It is a figure which shows the 1st state of the further modification of the refrigerating apparatus and the heat source side unit which concerns on Embodiment 1. FIG. It is a figure which shows the 2nd state of the refrigerating apparatus and a heat source side unit shown in FIG. It is a figure which shows the 1st state of the modification of the refrigerating apparatus and the heat source side unit shown in FIG. 15 and FIG. It is a figure which shows the further modification example of the refrigerating apparatus and the heat source side unit which concerns on Embodiment 1. FIG.

The fifth flow path and the sixth flow path have a seventh branch point, an eighth branch point, the fifth branch point, and the sixth branch point at which the refrigerant splits or merges. In the fifth and sixth flow paths, the seventh branch point, the eighth branch point, the fifth branch point, and the sixth branch point are connected in series in order. The seventh branch point is arranged on the upstream side of the first inflow / outflow portion 2A of the heat source side heat exchanger 2 in the fifth flow path. The eighth branch point is arranged in the fifth flow path on the downstream side of the fourth inflow / outflow section 3B of the auxiliary heat exchanger 3 and on the upstream side of the first decompression section 4.

In the eighth flow path, an eleventh on-off valve 33 and a sixth on-off valve 16 for opening and closing the eighth flow path are arranged. 11th-off valve 33 is disposed between the discharge port 1B of the compressor 1 and the fifth outlet join the club 5 A of the use-side heat exchanger 5.

<Operation of refrigeration equipment>
In the refrigerating apparatus 103, the first state shown in FIG. 11 and the second state shown in FIG. 12 are switched by the plurality of flow path switching units. As shown in FIGS. 11 and 12, the switching between the first state and the second state in the refrigerating apparatus 103 is performed in the same manner as the switching between the first state and the second state in the refrigerating apparatus 100.

As shown in FIG. 15, when the refrigerating device 106 is in the cooling operation, the first on-off valve 11, the fourth on-off valve 14, and the fifth on-off valve 15 are opened, and the second on-off valve 12, the third on-off valve, and the third on-off valve are opened. 13, the sixth on-off valve 16, and the twelfth on-off valve 64 are closed. As a result, a part of the refrigerant discharged from the compressor 1 is used as the heat source side heat exchanger 2 as the first condenser, the auxiliary heat exchanger 3, the first decompression unit 4, and the first evaporator. While flowing through the heat exchanger 5 in order, the rest of the refrigerant discharged from the compressor 1 flows in order through the heat source side heat exchanger 2 and the economizer flow path 60. As a result, the cooling operation of the refrigerating apparatus 106 is further improved in efficiency as compared with that of the conventional refrigerating apparatus by utilizing the economizer circuit.

1 Compressor, 1A Suction port, 1B Discharge port, 2 Heat source side heat exchanger, 2A 1st inflow / outflow section, 2B 2nd inflow / outflow section, 2C 7th inflow / outflow section, 2D 8th inflow / outflow section, 3 Auxiliary heat exchanger, 3A 3rd inflow / outflow section, 3B 4th inflow / outflow section, 4th 1st decompression section, 5 user side heat exchanger, 5A 5th inflow / outflow section, 5B 6th inflow / outflow section, 6th 2nd decompression section, 7th 1st fan, 8th 2nd Fan, 9 3rd fan, 10A 1st flow path switching unit, 10B 2nd flow path switching unit, 10C 3rd flow path switching unit, 11 1st on-off valve, 12 2nd on-off valve, 13 3rd on-off valve, 14 4th on-off valve, 15 5th on-off valve, 16 6th on-off valve, 17 1st rectifying section, 18 2nd rectifying section, 19 3rd rectifying section, 20A 4th flow path switching section, 21 7th on-off valve, 22 8th on-off valve, 23 4th rectifying unit, 31 9th on-off valve, 32 10th on-off valve, 33 11th on-off valve, 34 5th rectifying unit, 35 6th rectifying unit, 51 high temperature side compressor, 52 high temperature side Condenser, 53 High temperature side decompression section, 54 4th fan, 55 pump, 56 heat exchanger, 60 economizer flow path, 61 economizer heat exchanger, 62 economizer decompression section, 63 5th bypass flow path, 64 12th on-off valve , 65 Economizer, 100, 101, 102, 103, 104, 105, 106, 107 Refrigeration equipment, 200, 201, 202 Heat source side unit, 210A 1st pipe, 210B 2nd pipe, 210C 3rd pipe, 210D 4th Pipe, 210E 5th pipe, 210F 6th pipe, 210H 8th pipe, 210I 9th pipe, 210J 10th pipe, 300 decompression unit, 400 user side unit, 500, 501, 502, 503 1st unit, 600 2nd unit.

Claims (10)

Equipped with a refrigerant circuit that circulates the refrigerant
The refrigerant circuit includes a compressor, a heat source side heat exchanger, a first decompression unit, a utilization side heat exchanger, a second decompression unit, an auxiliary heat exchanger, and a flow path switching unit.
The flow path switching unit is
The heat source side heat exchanger and the auxiliary heat exchanger act as the first condenser, the utilization side heat exchanger acts as the first evaporator, and the refrigerant is the compressor, the first condenser, and the said. The first decompression unit, the first state flowing through the first evaporator in order, and
The user-side heat exchanger acts as a second condenser, the auxiliary heat exchanger acts as a second evaporator, and the refrigerant is the compressor, the second condenser, the second decompression unit, and the said. A refrigerating apparatus provided to switch between a second state in which the second evaporator flows in sequence. The refrigerating apparatus according to claim 1, wherein in the first state, the auxiliary heat exchanger is arranged on the upstream side of the refrigerant circuit with respect to the heat source side heat exchanger. The refrigerant circuit
A first flow path connecting the discharge port of the compressor and the heat exchanger on the utilization side via the auxiliary heat exchanger, the heat exchanger on the heat source side, and the first decompression unit.
A second flow path that connects the discharge port of the compressor and the heat exchanger on the utilization side without passing through the auxiliary heat exchanger, the heat exchanger on the heat source side, and the first decompression unit.
A third flow path connecting the user-side heat exchanger and the suction port of the compressor via the second decompression unit and the auxiliary heat exchanger, and
Includes a second flow path that connects the user-side heat exchanger and the suction port of the compressor without the intervention of the second decompression unit and the auxiliary heat exchanger.
The flow path switching unit is
It has a first flow path switching unit that switches between the first flow path and the second flow path, and a second flow path switching unit that switches between the third flow path and the fourth flow path.
The first flow path switching unit forms the first flow path in the first state, and forms the second flow path in the second state.
The freezing device according to claim 2, wherein the second flow path switching unit forms the fourth flow path in the first state and forms the third flow path in the second state. The refrigerating apparatus according to claim 1, wherein in the first state, the heat source side heat exchanger is arranged on the upstream side of the refrigerant circuit with respect to the auxiliary heat exchanger. The refrigerating apparatus according to claim 1, wherein in the first state, the heat source side heat exchanger and the auxiliary heat exchanger are connected in parallel. Further equipped with a heat medium circuit in which the heat medium circulates,
The heat source side heat exchanger is provided so as to exchange heat between the refrigerant circulating in the refrigerant circuit and the heat medium circulating in the heat medium circuit, any one of claims 1 to 5. Refrigeration equipment described in. Further equipped with an economizer circuit that circulates the refrigerant,
The economizer circuit includes the compressor and the heat source side heat exchanger.
The economizer circuit further includes an economizer flow path that returns a part of the refrigerant condensed in the heat source side heat exchanger to the compressor.
In the second state, the heat source side heat exchanger and the utilization side heat exchanger act as the second condenser.
The refrigerating apparatus according to any one of claims 1 to 6, further comprising a first fan for blowing air to the heat source side heat exchanger and a second fan for blowing air to the auxiliary heat exchanger. The refrigerating apparatus according to any one of claims 1 to 7, further comprising a first housing containing the heat source side heat exchanger and the auxiliary heat exchanger inside. The first housing further houses the compressor, the first decompression section, and the second decompression section.
The refrigerating apparatus according to claim 8, further comprising a second housing containing the user-side heat exchanger inside. A refrigerating device including a compressor, a heat source side heat exchanger, a first decompression unit, a utilization side heat exchanger, a second decompression unit, an auxiliary heat exchanger, and a flow path switching unit, and having a refrigerant circuit in which a refrigerant circulates. It is a heat source side unit that composes the part,
A part of the refrigerant circuit including the compressor, the heat source side heat exchanger, the auxiliary heat exchanger, the second decompression unit, and the flow path switching unit.
An outlet that flows out from a part of the refrigerant circuit to another part of the refrigerant circuit,
It is provided with an inflow port that flows into a part of the refrigerant circuit from another part of the refrigerant circuit.
The flow path switching unit is
A first state in which the heat source side heat exchanger and the auxiliary heat exchanger act as the first condenser, and the refrigerant flows through the inlet, the compressor, the first condenser, and the outlet in order.
The auxiliary heat exchanger acts as a first evaporator, and the refrigerant switches between a second state in which the refrigerant flows through the inlet, the second decompression unit, the first evaporator, the compressor, and the outlet in order. , Heat source side unit.

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