Refrigeration system

Abstract

The refrigeration system includes: a turbomachine including: a rotating shaft; a compressor wheel, a turbine wheel, and a motor each mounted on the rotating shaft; and a housing that houses the rotating shaft, the compressor wheel, the turbine wheel, and the motor. A compressed fluid line for guiding the fluid compressed by the compressor wheel to the turbine wheel; the cooler is arranged in the compressed fluid pipeline and exchanges heat between the fluid flowing through the compressed fluid pipeline and the cooling liquid; the cooling liquid circulating pipeline is provided with a cooling device for cooling the cooling liquid; and the cooling liquid leading-in pipeline is used for extracting the cooling liquid from the cooling liquid circulating pipeline and leading the cooling liquid into the shell.

Description

Technical Field

[0001] The present disclosure relates to a refrigeration system including a turbomachine.

[0002] This application claims priority based on Japanese Patent Application No. 2022-162041 filed with the Japan Patent Office on October 7, 2022, and the contents of which are incorporated herein by reference. Background Art

[0003] In the past, there was a refrigerator that introduced air in a cold storage as the refrigerant of an air-refrigerant refrigeration device, cooled the air that became high pressure and high temperature in a compressor by a cooler, and then used an expander to make it low pressure and low temperature, thereby obtaining cooling capacity (see Patent Document 1).

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: (Japan) Patent No. 4241699 Summary of the invention

[0007] Problems to be solved by the invention

[0008] Patent Document 1 discloses an air refrigerant refrigeration device that cools the heat generated by the motor through an external cooling air pipeline. Although the turbomachinery can be cooled by providing an external cooling air pipeline, the structure of the refrigeration system including the turbomachinery may be complicated. If the structure of the refrigeration system is complicated, it may be difficult to make it compact or lightweight.

[0009] In view of the above circumstances, an object of at least one embodiment of the present invention is to provide a refrigeration system capable of cooling a turbomachine while suppressing complication of the structure of a refrigeration system including a turbomachine.

[0010] Technical solutions for solving technical problems

[0011] A refrigeration system according to one embodiment of the present disclosure comprises:

[0012] A turbomachinery, the turbomachinery comprising:

[0013] Axis of rotation;

[0014] a compressor impeller mounted on one side of the rotating shaft;

[0015] a turbine impeller mounted on the other side of the rotating shaft;

[0016] an electric motor mounted on the rotating shaft between the compressor impeller and the turbine impeller and configured to generate a rotational force for rotating the rotating shaft;

[0017] a housing configured to accommodate the rotating shaft, the compressor impeller, the turbine impeller, and the electric motor;

[0018] a compressed fluid line for guiding the fluid compressed by the compressor impeller to the turbine impeller;

[0019] a cooler disposed in the compressed fluid pipeline and configured to perform heat exchange between the fluid flowing through the compressed fluid pipeline and a cooling liquid;

[0020] A coolant circulation pipeline, which is used to circulate the coolant and is provided with a cooling device for cooling the coolant;

[0021] The coolant introduction pipeline is used to extract the coolant from the coolant circulation pipeline and introduce it into the interior of the shell.

[0022] Effects of the Invention

[0023] According to at least one embodiment of the present disclosure, there is provided a refrigeration system capable of cooling the turbomachine while suppressing complication of the configuration of the refrigeration system including the turbomachine. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of a refrigeration system according to an embodiment of the present disclosure.

[0025] Figure 2 It is along Figure 1 A schematic cross-sectional view of the axis of the turbomachinery is shown in FIG.

[0026] Figure 3 It is along Figure 2 A schematic cross-sectional view along the axis of a variant of a turbomachine shown in FIG.

[0027] Figure 4 Schematic diagram of a refrigeration system according to an embodiment of the present disclosure.

[0028] Figure 5 It is along Figure 4 A schematic cross-sectional view of the axis of the turbomachinery is shown in FIG.

[0029] Figure 6 It is along Figure 5 A schematic cross-sectional view along the axis of a variant of a turbomachine shown in FIG. DETAILED DESCRIPTION

[0030] Hereinafter, some embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the sizes, materials, shapes, and relative arrangements of the components described in the embodiments or shown in the drawings are not intended to limit the scope of the present disclosure, but are merely illustrative examples.

[0031] (Turbomachinery)

[0032] Figure 1 1 is a diagram schematically showing a refrigeration system 1 according to an embodiment of the present disclosure. Figure 2 It is along Figure 1 A schematic cross-sectional view of the axis LA of the turbomachine 2 is shown in FIG. Figure 2 , a cross section including the axis LA of the rotating shaft 3 of the turbomachine 2 is shown. Figure 1 As shown, the refrigeration system 1 includes a turbomachine 2 , which includes at least a compressor impeller 4 and a turbine impeller 5 .

[0033] like Figure 1 as well as Figure 2 As shown, the turbomachine 2 includes: a rotating shaft 3; a compressor impeller 4 (centrifugal compressor), which is installed on one side of the rotating shaft 3 ( Figure 1 , Figure 2 The turbine impeller 5 (expander) is mounted on the other side of the rotating shaft 3 ( Figure 1 , Figure 2 The motor 6 is mounted on the rotating shaft 3 between the compressor impeller 4 and the turbine impeller 5; and the housing 7 is configured to accommodate the rotating shaft 3, the compressor impeller 4, the turbine impeller 5, and the motor 6. The motor 6 is configured to generate a rotational force to rotate the rotating shaft 3.

[0034] The rotating shaft 3 extends along the axis LA of the rotating shaft 3. The compressor impeller 4 is connected to one end side of the extending direction of the rotating shaft 3, and the turbine impeller 5 is connected to the other end side of the extending direction of the rotating shaft 3. In other words, the compressor impeller 4 and the turbine impeller 5 are coaxially arranged with each other via the rotating shaft 3 as the output shaft of the electric motor 6, and are respectively connected to the rotating shaft 3.

[0035] Next, the direction in which the axis LA of the rotating shaft 3 extends ( Figure 2 The left-right direction in the middle is defined as the axial direction of the rotating shaft 3 (turbomachine 2), the direction orthogonal to the axis LA is defined as the radial direction of the rotating shaft 3 (turbomachine 2), and the circumferential direction around the axis LA is defined as the circumferential direction of the rotating shaft 3 (turbomachine 2). The side of the axial direction of the rotating shaft 3 (turbomachine 2) where the compressor impeller 4 is located relative to the turbine impeller 5 is defined as the compressor side, and the side of the compressor impeller 4 where the turbine impeller 5 is located is defined as the turbine side.

[0036] In the illustrated embodiment, the turbomachine 2 further includes: a compressor side bearing 8 configured to rotatably support the rotating shaft 3 between the compressor impeller 4 and the motor 6; and a turbine side bearing 9 configured to rotatably support the rotating shaft 3 between the turbine impeller 5 and the motor 6. Each of the compressor side bearing 8 and the turbine side bearing 9 is supported by the housing 7. The rotating shaft 3 is supported by the compressor side bearing 8 and the turbine side bearing 9 so as to be rotatable around the axis LA of the rotating shaft 3. The motor 6 is supplied with current from a power source (generator, etc.) not shown in the figure, and is driven by the current supplied from the power source so as to drive (rotate) the rotating shaft 3, the compressor impeller 4, and the turbine impeller 5.

[0037] (Compressor impeller)

[0038] The compressor impeller 4 is driven (rotated) by the motor 6 to suck the fluid into the interior of the housing 7, compress the fluid guided to the compressor impeller 4, and deliver it to the supply destination of the fluid. The compressor impeller 4 is provided so as to be able to rotate integrally with the rotating shaft 3 around the axis LA of the rotating shaft 3. The compressor impeller 4 is configured to guide the fluid introduced along the axial direction of the rotating shaft 3 to the radially outer side of the rotating shaft 3.

[0039] like Figure 2 As shown, the compressor impeller 4 includes: a hub 41 of a substantially truncated cone shape, which is fixed to the above-mentioned one end side of the rotating shaft 3; and a plurality of impeller blades 42, which are arranged around the hub 41. The outer peripheral surface 43 of the hub 41 is formed into a concave curved shape with the distance from the axis LA increasing as it approaches the turbine side (the back side 44 side of the hub 41) in the axial direction of the rotating shaft 3. Each of the plurality of impeller blades 42 is erected from the outer peripheral surface 43 of the hub 41, and is arranged at intervals from the other impeller blades 42 in the circumferential direction around the axis LA. In the illustrated embodiment, the compressor impeller 4 is composed of an open impeller that does not include an annular component that covers the front end of each of the plurality of impeller blades 42.

[0040] (Turbine impeller)

[0041] The turbine impeller 5 rotates by recovering a portion of the energy of the fluid guided to the turbine impeller 5. The drive (rotation) of the compressor impeller 4 is assisted by the energy of the fluid recovered by the turbine impeller 5. The turbine impeller 5 is provided so as to be rotatable integrally with the rotating shaft 3 around the axis LA of the rotating shaft 3. The turbine impeller 5 is configured to guide the fluid introduced from the outer side in the radial direction of the rotating shaft 3 along the axial direction of the rotating shaft 3.

[0042] like Figure 2As shown, the turbine impeller 5 includes: a hub 51 having a substantially truncated cone shape, which is fixed to the other end side of the rotating shaft 3; and a plurality of turbine blades 52, which are arranged around the hub 51. The outer peripheral surface 53 of the hub 51 is formed into a concave curved shape with the distance from the axis LA increasing as it goes toward the compressor side (the back surface 54 side of the hub 51) in the axial direction of the rotating shaft 3. Each of the plurality of turbine blades 52 is erected from the outer peripheral surface 53 of the hub 51, and is arranged at intervals from other turbine blades 52 in the circumferential direction around the axis LA.

[0043] (case)

[0044] like Figure 2 As shown, the housing 7 includes: a compressor side storage space 11, which rotatably stores the compressor impeller 4; a turbine side storage space 12, which rotatably stores the turbine impeller 5; and a motor chamber 13, which stores the motor 6. The motor 6 includes: a rotor, which is installed between the compressor side bearing 8 and the turbine side bearing 9 in the rotating shaft 3, and a stator, which is arranged with a gap between the rotor to cover the outer peripheral side of the rotor and supported by the housing 7. The rotor of the motor 6 is arranged in the motor chamber 13 and is set to be able to rotate integrally with the rotating shaft 3. The stator of the motor 6 is arranged in the motor chamber 13 on the outer side of the above-mentioned radial direction than the above-mentioned rotor. The stator of the motor 6 is supported by the wall surface (at least one of the outer wall 16, the compressor side partition wall 17 or the turbine side partition wall 18) forming the motor chamber 13. In addition, the housing 7 is formed with a compressor-side communicating hole 14 that communicates the compressor-side housing space 11 with the motor chamber 13, and a turbine-side communicating hole 15 that communicates the turbine-side housing space 12 with the motor chamber 13. Each of the compressor-side communicating hole 14 and the turbine-side communicating hole 15 extends along the extending direction of the rotating shaft 3, and the rotating shaft 3 is inserted therethrough. The compressor-side bearing 8 is disposed inside the compressor-side communicating hole 14. The turbine-side bearing 9 is disposed inside the turbine-side communicating hole 15.

[0045] The housing 7 includes an outer wall 16 that covers the outer peripheral side of the motor chamber 13, a compressor side partition wall 17 that partitions the compressor side storage space 11 from the motor chamber 13, and a turbine side partition wall 18 that partitions the turbine side storage space 12 from the motor chamber 13. The outer wall 16 is formed in a cylindrical shape extending along the extending direction of the rotating shaft 3, and partitions the outside of the outer wall 16 from the motor chamber 13. Each of the compressor side partition wall 17 and the turbine side partition wall 18 is formed in an annular shape extending in a direction intersecting (orthogonal) with the axis LA of the rotating shaft 3. The compressor side communication hole 14 is formed by the inner peripheral surface of the compressor side partition wall 17. The turbine side communication hole 15 is formed by the inner peripheral surface of the turbine side partition wall 18.

[0046] The outer wall 16 has an inner surface 161 facing the motor chamber 13. The compressor side partition wall 17 has a compressor side back surface 171 facing the compressor side storage space 11 and a compressor side inner surface 172 facing the motor chamber 13. The back surface 44 of the compressor impeller 4 is opposite to the compressor side back surface 171 with a gap. The turbine side partition wall 18 has a turbine side back surface 181 facing the turbine side storage space 12 and a turbine side inner surface 182 facing the motor chamber 13. The back surface 54 of the turbine impeller 5 is opposite to the turbine side back surface 181 with a gap. The motor chamber 13 is formed by the inner surface 161, the compressor side inner surface 172 and the turbine side inner surface 182.

[0047] (Compressor casing, turbine casing)

[0048] The housing 7 further includes: a compressor housing 21, which forms a compressor-side storage space 11 between the compressor-side back surface 171; and a turbine housing 22, which forms a turbine-side storage space 12 between the turbine-side back surface 181. The centrifugal compressor 4A of the turbomachine 2 is composed of a compressor impeller 4, a compressor housing 21, and a compressor-side partition wall 17. The expander 5A of the turbomachine 2 is composed of a turbine wheel 5, a turbine housing 22, and a turbine-side partition wall 18. It should be noted that in the illustrated embodiment, the compressor-side partition wall 17 is formed separately from each of the compressor housing 21 and the outer wall 16, but it can also be formed integrally with either the compressor housing 21 or the outer wall 16. In addition, the turbine-side partition wall 18 is formed separately from each of the turbine housing 22 and the outer wall 16, but it can also be formed integrally with either the turbine housing 22 or the outer wall 16.

[0049] The compressor housing 21 also includes a fluid introduction flow path forming portion 212 that forms a fluid introduction flow path 211 and a vortex flow path forming portion 214 that forms a vortex flow path 213. That is, the fluid introduction flow path 211 and the vortex flow path 213 are formed inside the compressor housing 21. The vortex flow path 213 is provided on the outer peripheral side of the compressor impeller 4 and is composed of a spiral flow path extending along the circumferential direction of the rotating shaft 3.

[0050] The fluid introduction flow path 211 is a flow path for introducing fluid from the outside of the compressor housing 21 and guiding the introduced fluid to the compressor impeller 4. The fluid introduction flow path 211 extends along the axial direction of the rotating shaft 3. By driving the compressor impeller 4, the fluid is introduced from the outside of the compressor housing 21 into the fluid introduction flow path 211, and the introduced fluid flows through the fluid introduction flow path 211 and is guided to the compressor impeller 4. The fluid that has passed through the compressor impeller 4 flows through the vortex flow path 213 and is then discharged to the outside of the compressor housing 21.

[0051] The turbine housing 22 also includes a vortex flow path forming portion 222 that forms a vortex flow path 221 and a fluid discharge flow path forming portion 224 that forms a fluid discharge flow path 223. That is, the vortex flow path 221 and the fluid discharge flow path 223 are formed inside the turbine housing 22. The vortex flow path 221 is provided on the outer peripheral side of the turbine impeller 5 and is composed of a spiral flow path extending along the circumferential direction of the rotating shaft 3.

[0052] The vortex flow path 221 is a flow path for guiding the fluid introduced from the outside of the turbine housing 22 to the turbine impeller 5. The fluid discharge flow path 223 is a flow path for discharging the fluid that has passed through the turbine impeller 5 to the outside of the turbine housing 22. The fluid discharge flow path 223 extends along the axial direction of the rotating shaft 3. The fluid introduced from the outside of the turbine housing 22 flows through the vortex flow path 221 and is guided to the turbine impeller 5. The fluid that has passed through the turbine impeller 5 flows through the fluid discharge flow path 223 and is then discharged to the outside of the turbine housing 22.

[0053] (Refrigeration System)

[0054] like Figure 1 As shown, the refrigeration system 1 includes the turbomachine 2, the compressed fluid pipeline 23, the cooler 24, the coolant circulation pipeline 25, and the coolant introduction pipeline 26. The turbomachine 2, the compressed fluid pipeline 23, and the cooler 24 constitute a refrigerator (refrigeration cycle) 30, and the refrigerator 30 uses the above-mentioned fluid as a heat medium. By sending the fluid cooled in the refrigerator 30 to the supply destination 27 of the fluid, it is possible to perform temperature adjustment to reduce the temperature of the supply destination 27 of the fluid. In the following embodiment, the container body 27A is cited as a specific example of the supply destination 27 of the fluid for description, but the supply destination 27 of the fluid is not limited to the container body 27A.

[0055] The container body 27A has an inner space 270 capable of storing goods and other articles. The refrigerator 30 is configured to cool a fluid such as air inside the container body 27A (i.e., the inner space 270). The container body 27A has a plurality of walls forming the inner space 270. The inner space 270 of the container body 27A and the outside of the container body 27A are separated by each of the plurality of walls. The container body 27A may be a transport container for transporting goods and the like. The container body 27A may be a standard transport container such as a 10ft container, a 20ft container, or a 40ft container.

[0056] In the illustrated embodiment, the refrigerator 30 of the refrigeration system 1 further includes: a fluid introduction pipeline 28 for guiding the fluid to the compressor impeller 4; an expansion fluid pipeline 29 for guiding the fluid expanded by the turbine impeller 5 to the container body 27A; and a heat exchanger 31. The upstream end of the fluid introduction pipeline 28 is connected to the container body 27A. The fluid introduction pipeline 28 has a suction port 32 (opening) for sucking a fluid such as air inside the container body 27A. The downstream end of the expansion fluid pipeline 29 is connected to the container body 27A. The expansion fluid pipeline 29 has a discharge port 33 (opening) for discharging a fluid such as air into the container body 27A. Each of the suction port 32 and the discharge port 33 is formed in the inner space 270 of the container body 27A.

[0057] The refrigerator 30 is configured to draw out the fluid inside the container body 27A and use it as a heat medium. It should be noted that the refrigerator 30 may include a heat exchanger configured to perform heat exchange between the fluid inside the container body 27A and the heat medium, and the refrigerator 30 may be configured to use the heat medium that exchanges heat with the fluid inside the container body 27A in the heat exchanger.

[0058] Each of the fluid introduction line 28, the compressed fluid line 23, and the expansion fluid line 29 is formed by a pipe. It should be noted that each pipe forming the fluid introduction line 28, the compressed fluid line 23, and the expansion fluid line 29 may be connected to a plurality of pipe parts via flanges or the like.

[0059] The fluid sucked from the inside of the container body 27A through the suction port 32 flows into the fluid introduction line 28, the compressed fluid line 23, and the expanded fluid line 29. The compressor impeller 4 (centrifugal compressor 4A) is configured to compress the fluid sucked from the inside of the container body 27A through the suction port 32. By driving the compressor impeller 4 (centrifugal compressor 4A), the fluid inside the container body 27A is sucked into the fluid introduction line 28 through the suction port 32. The fluid compressed by the compressor impeller 4 is heated and pressurized compared to before being introduced into the compressor impeller 4, and becomes a high-temperature and high-pressure fluid.

[0060] (Compressed fluid pipeline)

[0061] The compressed fluid line 23 is a flow path for guiding the fluid compressed by the compressor impeller 4 to the turbine impeller 5. In the compressed fluid line 23, its upstream end is connected to the centrifugal compressor 4A (for example, the fluid outlet of the compressor housing 21), and its downstream end is connected to the expander 5A (for example, the fluid inlet of the turbine housing 22). The fluid compressed by the compressor impeller 4 is guided to the turbine impeller 5 via the compressed fluid line 23.

[0062] (Heat Exchanger)

[0063] The heat exchanger 31 is configured to cool the high-temperature and high-pressure fluid compressed in the centrifugal compressor 4A. In the illustrated embodiment, the heat exchanger 31 is configured to perform heat exchange between the fluid flowing through the fluid introduction line 28 and the fluid flowing through the compressed fluid line 23. The fluid flowing through the compressed fluid line 23 is compressed by the compressor impeller 4 so that it is higher in temperature than the fluid flowing through the fluid introduction line 28. Through the heat exchange in the heat exchanger 31, the fluid flowing through the compressed fluid line 23 is cooled by the fluid flowing through the fluid introduction line 28, and the fluid flowing through the fluid introduction line 28 is heated by the fluid flowing through the compressed fluid line 23. The heat exchanger 31 includes a low-temperature side heat exchange portion 311 through which the fluid provided in the fluid introduction line 28 flows and a high-temperature side heat exchange portion 312 through which the fluid provided in the compressed fluid line 23 flows, and heat is transferred from the fluid flowing through the high-temperature side heat exchange portion 312 to the fluid flowing through the low-temperature side heat exchange portion 311.

[0064] (Cooler)

[0065] like Figure 1 As shown, the cooler 24 is provided between the compressor impeller 4 of the compressed fluid line 23 and the heat exchanger 31 (high temperature side heat exchange part 312) (on the upstream side of the heat exchanger 31 of the compressed fluid line 23), and is configured to perform heat exchange between the fluid flowing through the compressed fluid line 23 and a coolant (for example, water) having a lower temperature than the fluid. Through the heat exchange in the cooler 24, the fluid flowing through the compressed fluid line 23 and toward the heat exchanger 31 is cooled by the coolant. The fluid cooled in the cooler 24 is introduced into the heat exchanger 31 (high temperature side heat exchange part 312) through the compressed fluid line 23.

[0066] (Coolant circulation line)

[0067] The coolant circulation line 25 is a flow path for circulating the coolant. The coolant is supplied to the cooler 24 via the coolant circulation line 25. Specifically, a radiator 35 constituting a cooling device 34 for cooling the coolant and a pump 36 for conveying the coolant in the coolant circulation line 25 are provided in the coolant circulation line 25. The cooling device 34 includes the radiator 35 and a fan 37 for air cooling the radiator 35. The coolant whose temperature rises in the cooler 24 by heat exchange with the fluid flowing through the compressed fluid line 23 is conveyed to the coolant circulation line 25 by the pump 36, and is cooled by the cooling device 34 including the radiator 35. The coolant cooled by the cooling device 34 is supplied to the cooler 24 via the coolant circulation line 25. It should be noted that the refrigerant circulating in the coolant circulation line 25 may be in a gaseous state, and is not limited to a liquid state. The refrigerant circulating in the cooling liquid circulation line 25 may be a fluorine-based refrigerant (refrigerant gas) such as R-1234ZE or an antifreeze such as ethylene glycol water. The refrigerant circulating in the cooling liquid circulation line 25 preferably has a freezing point lower than that of water.

[0068] The turbine impeller 5 (expander 5A) is configured to expand the fluid cooled in the cooler 24 and the heat exchanger 31. The low-temperature fluid expanded in the expander 5A is guided to the discharge port 33 via the expansion fluid conduit 29 and discharged from the discharge port 33 into the container body 27A.

[0069] (Coolant inlet pipe)

[0070] like Figure 1 As shown, the refrigeration system 1 of some embodiments at least includes the above-mentioned turbomachinery 2, the above-mentioned compressed fluid pipeline 23, the above-mentioned cooler 24, the above-mentioned coolant circulation pipeline 25 and the coolant introduction pipeline 26.

[0071] The coolant introduction line 26 is a flow path for extracting coolant from the coolant circulation line 25 and introducing it into the interior of the shell 7. The coolant introduction line 26 is formed by a pipe. It should be noted that each pipe forming the coolant introduction line 26 can be connected to a plurality of pipe parts via a flange or the like. In the illustrated embodiment, the coolant introduction line 26 has a coolant spray port 261 (opening) for spraying the coolant extracted from the coolant circulation line 25 into the interior of the shell 7. The coolant spray port 261 is formed inside the shell 7.

[0072] According to the above configuration, the coolant circulating in the coolant circulation pipe 25 is cooled in the cooling device 34, so that a relatively low temperature is maintained. The refrigeration system 1 can cool the inside of the housing 7 (turbomachine 2) by extracting the coolant from the coolant circulation pipe 25 through the coolant introduction pipe 26 and introducing it into the inside of the housing 7 of the turbomachine 2. In addition, according to the above configuration, the coolant circulation pipe 25 provided in the refrigeration system 1 can be used as a cooling device for cooling the inside of the housing 7, and there is no need to separately provide the above cooling device, so that the complexity of the structure of the refrigeration system 1 including the turbomachine 2 can be suppressed.

[0073] In some embodiments, Figure 1 As shown, the refrigeration system 1 further includes a coolant recovery line 38, which is used to extract the coolant introduced into the interior of the shell 7 via the coolant introduction line 26 from the interior of the shell 7 and guide it to the coolant circulation line 25. The coolant recovery line 38 is formed by a pipe. It should be noted that each pipe forming the coolant recovery line 38 can be connected to a plurality of pipe parts via a flange or the like. In the illustrated embodiment, the coolant recovery line 38 has a coolant suction port 381 (opening), which is used to suck the coolant introduced into the interior of the shell 7.

[0074] According to the above configuration, the refrigeration system 1 recovers the coolant from the inside of the housing 7 to the coolant circulation line 25 via the coolant recovery line 38 , thereby being able to reuse the recovered coolant and reduce the frequency of replenishing the coolant to the coolant circulation line 25 .

[0075] (Coolant flow control device)

[0076] In some embodiments, Figure 1 As shown, the refrigeration system 1 further includes a coolant flow regulating device (coolant flow regulating valve) 39, which is arranged in the coolant inlet pipe 26 and is configured to be able to regulate the flow of the coolant flowing through the coolant inlet pipe 26. The coolant flow regulating device 39 is configured to be able to regulate the flow of the coolant guided to the downstream side (coolant outlet 261 side) of the coolant flow regulating device 39 by changing the opening of the valve body arranged in the coolant inlet pipe 26. It should be noted that the coolant flow regulating device 39 can be an on-off valve whose opening can be adjusted to fully closed and fully open, or an opening regulating valve whose opening can be adjusted to fully closed, fully open, and at least one intermediate opening therebetween. It should be noted that the refrigeration system 1 of some embodiments of the present disclosure can also be applied to a refrigeration system 1 that does not include the coolant flow regulating device 39.

[0077] In some embodiments, Figure 1 As shown, the coolant circulation pipeline 25 includes: a coolant supply pipeline 25A, which is used to transport the coolant from the radiator 35 (cooling device 34) to the cooler 24; and a coolant return pipeline 25B, which is used to transport the coolant from the cooler 24 to the radiator 35 (cooling device 34). The coolant introduction pipeline 26 is connected to the coolant supply pipeline 25A.

[0078] In the illustrated embodiment, the cooling liquid supply line 25A is provided with the pump 36. The upstream end of the cooling liquid introduction line 26 is connected to the cooling liquid supply line 25A at a connection position P1 between the pump 36 and the cooler 24 of the cooling liquid supply line 25A.

[0079] According to the above structure, the coolant cooled by the cooling device 34 can be introduced into the interior of the housing 7. In this case, compared with the case where the coolant heated by the cooler 24 is introduced into the interior of the housing 7, the coolant guided into the interior of the housing 7 can be made low temperature, so the interior of the housing 7 can be cooled more effectively by the coolant.

[0080] In the illustrated embodiment, the downstream end of the coolant recovery line 38 is connected to the coolant return line 25B at the connection position P2 in the coolant return line 25B. In this case, the coolant recovered from the inside of the housing 7 via the coolant recovery line 38 is introduced into the cooling device 34.

[0081] (Inner space on the motor side, inner space on the compressor side, inner space on the turbine side)

[0082] Figure 3 It is along Figure 2 A schematic cross-sectional view of the axis LA of a variant of the turbomachine 2 shown in FIG. Figure 3 , a cross section including the axis LA of the rotating shaft 3 of the turbomachine 2 is shown.

[0083] In some embodiments, Figure 2 , Figure 3 As shown, the housing 7 includes the outer wall 16, the compressor side partition wall 17, and the turbine side partition wall 18. The housing 7 is formed with at least one of the following: a motor side internal space 160 formed inside the outer wall 16, a compressor side internal space 170 formed inside the compressor side partition wall 17, or a turbine side internal space 180 formed inside the turbine side partition wall 18. The coolant introduction pipe 26 is connected to any one of the motor side internal space 160, the compressor side internal space 170, or the turbine side internal space 180.

[0084] Each of the motor-side internal space 160, the compressor-side internal space 170, and the turbine-side internal space 180 can be formed into an arc shape or an annular shape extending along the circumferential direction of the rotating shaft 3. Here, the circumferential extension along the rotating shaft 3 is not limited to the flow path extending the above-mentioned internal spaces 160, 170, and 180 along the above-mentioned circumferential direction. In addition to the flow path extending along the above-mentioned circumferential direction, it can also include a flow path extending along either the above-mentioned axial direction or the above-mentioned radial direction. For example, the motor-side internal space 160 can be a winding flow path that alternately combines the flow path extending along the above-mentioned circumferential direction and the flow path extending along the above-mentioned axial direction. Each of the motor-side internal space 160, the compressor-side internal space 170, and the turbine-side internal space 180 is not connected to any of the compressor-side storage space 11, the turbine-side storage space 12, and the motor chamber 13.

[0085] The motor side internal space 160 includes Figure 2 , Figure 3 In the cross section of the axis LA as shown in FIG. 1 , the cross section may have a rectangular or long hole-shaped cross section along the longitudinal direction of the axial direction. In addition, each of the compressor side internal space 170 and the turbine side internal space 180 includes the following: Figure 2 , Figure 3 The cross section along the axis LA as shown may have a cross-sectional shape formed into a rectangular shape or a long hole shape having a longitudinal direction along the radial direction.

[0086] In the illustrated embodiment, each of the downstream end of the coolant introduction pipe 26 and the coolant recovery pipe 38 is connected to the motor side internal space 160. Each of the coolant ejection port 261 and the coolant suction port 381 is formed inside the motor side internal space 160 (in the illustrated example, the wall surface of the motor side internal space 160 forming the outer wall 16). It should be noted that each of the downstream end of the coolant introduction pipe 26 and the coolant recovery pipe 38 can be connected to the compressor side internal space 170 or the turbine side internal space 180, and can also be connected to the internal space (not shown) formed in the compressor housing 21 or the internal space (not shown) formed inside the turbine housing 22.

[0087] According to the above configuration, the coolant is guided into any one of the motor-side internal space 160 , the compressor-side internal space 170 , or the turbine-side internal space 180 via the coolant introduction pipe 26 .

[0088] When the coolant introduction pipe 26 is connected to the motor-side internal space 160, the outer wall 16 of the housing 7, the motor 6, and the motor chamber 13 can be cooled by the coolant introduced into the motor-side internal space 160 via the coolant introduction pipe 26. As a result, the heat generated by the motor 6 can be prevented from being transferred to the turbine side (the turbine-side partition wall 18 or the turbine-side internal space 180), and the heat input from the compressor side can be prevented from being transferred to the turbine side via the outer wall 16 of the housing 7 or the motor chamber 13.

[0089] When the coolant introduction pipe 26 is connected to the compressor side internal space 170, the coolant introduced to the compressor side internal space 170 via the coolant introduction pipe 26 can be used to cool the compressor side partition wall 17, the motor chamber 13, and the compressor side internal space 170. As a result, it is possible to suppress the heat input from the compressor side from being transferred to the motor 6 side (the outer wall 16 of the housing 7 or the motor chamber 13) via the compressor side partition wall 17. In addition, by cooling the fluid that passes through the compressor impeller 4 and flows through the compressor side storage space 11, the temperature of the fluid introduced into the compressed fluid pipe 23 can be lowered, thereby achieving improved reliability and performance of the refrigerator (refrigeration cycle) 30 including the compressed fluid pipe 23.

[0090] When the coolant introduction pipe 26 is connected to the turbine side internal space 180, the turbine side partition wall 18 can be cooled by the coolant introduced into the turbine side internal space 180 via the coolant introduction pipe 26. Thus, it is possible to suppress the heat input from the motor 6 or the compressor side from being transferred to the turbine side via the turbine side partition wall 18.

[0091] In some embodiments, Figure 3 As shown, the housing 7 is formed with the motor side internal space 160, the compressor side internal space 170, and a connecting flow path 190 that connects the motor side internal space 160 with the compressor side internal space 170. The coolant introduction pipe 26 is connected to the motor side internal space 160 or the compressor side internal space 170.

[0092] The communication flow path 190 has a first opening 191 formed inside the motor-side internal space 160 and a second opening 192 formed inside the compressor-side internal space 170. In the illustrated embodiment, the first opening 191 is formed at the compressor-side end portion in the axial direction of the wall surface of the outer wall 16 forming the motor-side internal space 160. The second opening 192 is formed at the outer end portion in the radial direction of the wall surface of the compressor-side partition wall 17 forming the compressor-side internal space 170. It should be noted that the housing 7 may be formed with a communication flow path (not shown) that connects the motor-side internal space 160 with the turbine-side internal space 180.

[0093] According to the above structure, the coolant can flow between the motor-side internal space 160 and the compressor-side internal space 170 via the communication flow path 190. Thus, the coolant can be guided to both the motor-side internal space 160 and the compressor-side internal space 170, and the outer wall 16 of the housing 7 and the compressor-side partition wall 17 can be cooled by the coolant. In this case, since there is no need to provide a dedicated flow path for guiding the coolant to each of the motor-side internal space 160 and the compressor-side internal space 170, the complexity of the structure of the refrigeration system 1 can be suppressed.

[0094] (Thermal insulation material)

[0095] In some embodiments, Figure 3 As shown, the housing 7 is formed with the turbine side internal space 180. The turbomachine 2 further includes a heat insulating material 180A disposed in the turbine side internal space 180. The heat insulating performance of the heat insulating material 180A is higher than that of coolant such as water and air. It should be noted that the heat insulating material can be disposed inside the motor side internal space 160 or the compressor side internal space 170 where the coolant is not introduced.

[0096] If the coolant is guided to the turbine-side internal space 180, the coolant may become a heat source input to the turbine-side housing space 12 depending on the temperature of the coolant guided to the turbine-side internal space 180. According to the above structure, by arranging the heat insulating material 180A in the turbine-side internal space 180, it is possible to prevent the heat insulating material 180A from becoming the above-mentioned input heat source, and at the same time, suppress the heat input from the motor 6 or the compressor side from being transferred to the above-mentioned turbine side through the turbine-side partition wall 18.

[0097] In some embodiments, the fluid flowing through the refrigerator 30 is composed of any one selected from helium, hydrogen, neon, nitrogen, argon, oxygen, air and hydrocarbons, or a mixture of two or more thereof.

[0098] According to the above structure, by setting the fluid flowing through the refrigerator (refrigeration cycle) 30 including the compressed fluid pipeline 23 to a refrigerant that liquefies at a relatively low temperature (selected from any one of helium, hydrogen, neon, nitrogen, argon, oxygen, air and hydrocarbons, or a mixture of two or more), the corresponding temperature range of the above refrigerator (refrigeration cycle) 30 can be expanded to include an extremely low temperature or ultra-low temperature range.

[0099] In some embodiments, Figure 1As shown, the refrigeration system 1 includes: the container body 27A; a gas suction pipeline (the fluid introduction pipeline 28), which has a suction port 32 arranged inside the container body 27A, and is used to guide the gas sucked from the inside of the container body 27A through the suction port 32 as the fluid to the compressor impeller 4; and an expansion gas pipeline (the expansion fluid pipeline 29), which has a discharge port 33 arranged inside the container body 27A, and is used to guide the gas expanded by the turbine impeller 5 through the discharge port 33 to the inside of the container body 27A.

[0100] According to the above structure, a refrigerator (refrigeration cycle) 30 using the gas inside the container body 27A (gas inside the warehouse) as a heat medium is constructed. Since the gas inside the container body 27A circulates naturally from the discharge port 33 to the suction port 32 due to the difference between the pressure at the discharge port 33 and the pressure at the suction port 32, a fan for circulating the gas is not required. Therefore, the temperature inside the warehouse will not rise due to the installation of a fan and a fan motor inside the container body 27A. As a result, it is easy to maintain the temperature inside the warehouse at the desired temperature. In addition, since the fan and the fan motor are not installed inside the container body 27A, the cargo space inside the container body 27A can be ensured to be wider. Therefore, according to the above structure, a refrigerated container including the container body 27A can be obtained, which can suppress the reduction of the cargo space inside the container warehouse and can stably maintain the temperature inside the warehouse.

[0101] In order to use the refrigeration container (refrigeration container equipped with the refrigeration system 1) including the container body 27A for transportation purposes, it is required to miniaturize and lighten the refrigeration system 1. In order to meet the above requirements, when the turbomachine 2 is miniaturized, the distance between the compressor impeller 4 and the turbine impeller 5 is close, and the heat is easily input from the compressor side to the turbine side. Therefore, the heat insulation structure made of coolant or heat insulation material can be particularly effective.

[0102] Some of the embodiments described below can be implemented independently. For example, some of the embodiments described below can be applied to the refrigeration system 1 including the coolant introduction pipe 26 , and can also be applied to the refrigeration system 1 not including the coolant introduction pipe 26 .

[0103] (cold and hot medium supply pipelines, cold and hot medium return pipelines)

[0104] Figure 4 1 is a diagram schematically showing a refrigeration system 1 according to an embodiment of the present disclosure. Figure 5 It is along Figure 4 2 is a schematic cross-sectional view of the axis LA of the turbomachine 2 shown in FIG. Figure 6It is along Figure 5 In some embodiments, the housing 7 of the refrigeration system 1 includes the motor chamber 13. Figures 4 to 6 As shown, the refrigeration system 1 at least includes the turbomachine 2 , the compressed fluid pipeline 23 , the cooler 24 , the coolant circulation pipeline 25 , the cold and hot medium supply pipeline 61 and the cold and hot medium return pipeline 62 .

[0105] The upstream end (one end) of the cold and hot medium supply line 61 is connected to the compressed fluid line 23 on the downstream side of the cooler 24. The cold and hot medium supply line 61 is a flow path for extracting fluid from the compressed fluid line 23 and supplying it to the inside of the motor room 13 as a cold and hot medium for cooling the motor 6.

[0106] In the illustrated embodiment, the upstream end of the cold and hot medium supply pipeline 61 is connected to the compressed fluid pipeline 23 at a connection position P3 between the cooler 24 and the heat exchanger 31 (high temperature side heat exchange part 312) of the compressed fluid pipeline 23. The downstream end of the cold and hot medium supply pipeline 61 is connected to the motor room 13.

[0107] The cold / hot medium return line 62 is a flow path for returning the fluid supplied to the motor chamber 13 via the cold / hot medium supply line 61 to the fluid introduction line 28 for introducing the fluid to the compressor impeller 4 .

[0108] In the illustrated embodiment, the upstream end of the cold and hot medium return pipe 62 is connected to the motor room 13. The downstream end of the cold and hot medium return pipe 62 is connected to the fluid introduction pipe 28 at a connection position P4 between the heat exchanger 31 (low temperature side heat exchange part 311) of the fluid introduction pipe 28 and the compressor impeller 4.

[0109] In the illustrated embodiment, Figure 4 As shown, the refrigeration system 1 further includes a cold and hot medium supply amount regulating device (cold and hot medium supply amount regulating valve) 63, which is arranged in the cold and hot medium supply pipeline 61 and is configured to be able to regulate the flow rate of the gas (fluid) flowing through the cold and hot medium supply pipeline 61. The cold and hot medium supply amount regulating device 63 is configured to be able to regulate the flow rate of the gas (fluid) guided to the downstream side (cold and hot medium inlet 611 side) of the cold and hot medium supply amount regulating device 63 by changing the opening of the valve body arranged in the cold and hot medium supply pipeline 61. It should be noted that the cold and hot medium supply amount regulating device 63 can be an on-off valve whose opening can be adjusted to fully closed and fully opened, or an opening regulating valve whose opening can be adjusted to fully closed, fully opened, and at least one intermediate opening therebetween.

[0110] According to the above structure, since the refrigeration system 1 includes the cold and hot medium supply pipeline 61 and the cold and hot medium return pipeline 62, the fluid cooled in the cooler 24 can be used for cooling the motor 6 (motor room 13), and the fluid that has cooled the motor 6 can be returned to the fluid introduction pipeline 28. In this case, a part of the refrigeration cycle (compressed fluid pipeline 23 or fluid introduction pipeline 28, etc.) can be used as a flow path for the cold and hot medium (the above-mentioned fluid) for cooling the motor 6, thereby achieving a compact and lightweight structure of the refrigeration system 1.

[0111] In some embodiments, Figure 5 As shown, the minimum area D2 of the flow path 62A for the flow of the cold and hot medium in the cold and hot medium return pipeline 62 is smaller than the minimum area D1 of the flow path 61A for the flow of the cold and hot medium in the cold and hot medium supply pipeline 61. Figure 5 In the illustrated embodiment, each of the flow path 61A and the flow path 62A is formed inside the outer wall 16 (housing 7). Figure 5 In the illustrated embodiment, the flow path 61A includes a cold and hot medium inlet 611, and the flow path 62A includes a cold and hot medium inlet 621. Figure 6 In the illustrated embodiment, the flow path 61A is formed inside the outer wall 16, and the flow path 62A is formed inside the compressor side partition wall 17. Figure 6 In the illustrated embodiment, the flow path 61A includes a cold and hot medium inlet 611 , and the flow path 62A includes a cold and hot medium introduction port 621A.

[0112] According to the above structure, by making the minimum area D2 of the flow path 62A for the flow of the cold and hot medium in the cold and hot medium return pipe 62 smaller than the minimum area D1 of the flow path 61A for the flow of the cold and hot medium in the cold and hot medium supply pipe 61, pressure can be accumulated in the motor room 13. As a result, since the pressure difference between the pressure inside the motor room 13 and the pressure inside the compressor side storage space 11 is small, the leakage of the gas flowing through the compressor side storage space 11 from the compressor side storage space 11 to the motor room 13 can be reduced, and the temperature rise inside the motor room 13 caused by the relatively high temperature gas leaking from the compressor side storage space 11 to the motor room 13 can be suppressed.

[0113] In some embodiments, the cold and hot medium supply pipeline 61 has a cold and hot medium inlet 611, which is used to allow the cold and hot medium to flow from the cold and hot medium supply pipeline 61 into the motor room 13. The cold and hot medium return pipeline 62 has a cold and hot medium introduction port 621, which is used to introduce the cold and hot medium supplied to the motor room 13 into the cold and hot medium return pipeline 62. The cold and hot medium introduction port 621 is formed on the axial direction of the rotating shaft 3 at a side closer to the compressor impeller 4 than the cold and hot medium inlet 611.

[0114] According to the above structure, the cold and hot medium introduction port 621 is formed on the side closer to the compressor impeller 4 than the cold and hot medium inlet 611 in the above axial direction. In this case, the gas leaked from the compressor side storage space 11 to the motor room 13 or the leaked gas can be quickly discharged to the cold and hot medium return pipe 62 through the cold and hot medium introduction port 621. As a result, the temperature rise inside the motor room 13 caused by the gas leaked from the compressor side storage space 11 to the motor room 13 or the leaked gas can be suppressed.

[0115] In some embodiments, Figure 6 As shown, in the housing 7, a compressor-side communicating hole 14 is formed, which communicates the motor chamber 13 with the compressor-side housing space 11 and allows the rotating shaft 3 to be inserted. The refrigeration system 1 includes: a compressor-side bearing 8, which is arranged in the compressor-side communicating hole 14 and is configured to rotatably support the rotating shaft 3; and a compressor-side sealing portion 19, which is configured to seal the compressor-side communicating hole 14 and the rotating shaft 3 on the compressor-side housing space 11 side of the compressor-side communicating hole 14 relative to the compressor-side bearing 8. The compressor-side sealing portion 19 may include a sealing member that seals the compressor-side communicating hole 14 and the rotating shaft 3, and may also include a mechanical seal (recess) formed in at least one of the compressor-side communicating hole 14 and the rotating shaft 3.

[0116] The cold and hot medium return pipe 62 has a cold and hot medium introduction port 621A for introducing the cold and hot medium supplied to the motor chamber 13 into the cold and hot medium return pipe 62. The cold and hot medium introduction port 621A is formed between the compressor side bearing 8 and the compressor side seal portion 19 in the compressor side communication hole 14.

[0117] According to the above structure, the cold and hot medium introduction port 621A is formed between the compressor side bearing 8 and the compressor side seal portion 19 in the compressor side communication hole 14. In this case, the relatively high temperature gas guided from the compressor side storage space 11 to the compressor side communication hole 14 can be quickly discharged to the cold and hot medium return pipe 62 through the cold and hot medium introduction port 621A. As a result, since the gas leaking from the compressor side storage space 11 to the motor room 13 can be reduced, the temperature rise inside the motor room 13 caused by the leaked gas can be suppressed.

[0118] According to the above structure, the temperature rise of the compressor side bearing 8 caused by the relatively high temperature gas guided to the compressor side communication hole 14 can be suppressed. In addition, the compressor side bearing 8 can be cooled by the fluid introduced into the inside of the motor chamber 13 via the cold and hot medium supply pipeline 61. In this case, since the temperature of the compressor side bearing 8 can be maintained at a relatively low temperature, the performance degradation and thermal damage of the compressor side bearing 8 caused by the temperature rise can be suppressed, thereby achieving the improvement of the reliability of the turbomachine 2 including the compressor side bearing 8.

[0119] In some embodiments, at least one of the heat exchanger 31 or the cooler 24 may include a plate heat exchanger or a microchannel heat exchanger. The plate heat exchanger or the microchannel heat exchanger may be formed of a material containing aluminum or titanium.

[0120] In this specification, it is assumed that expressions indicating relative or absolute configurations such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric" or "coaxial" not only strictly indicate such configurations, but also indicate a state of relative displacement at an angle or distance with a tolerance or a degree that can achieve the same function.

[0121] For example, expressions such as “same”, “equal”, and “homogeneous” indicating that things are equal do not only indicate a strictly equal state but also indicate a state in which there is a tolerance or a difference to the extent that the same function can be obtained.

[0122] In the present specification, expressions indicating shapes such as a quadrangular shape or a cylindrical shape not only indicate shapes such as a quadrangular shape or a cylindrical shape in a strict geometric sense, but also indicate shapes including concave-convex portions or chamfered portions within a range that obtains the same effect.

[0123] In addition, in this specification, the expressions “including”, “comprising” or “having” one constituent element are not exclusive expressions excluding the presence of other constituent elements.

[0124] The present disclosure is not limited to the above-described embodiments, and includes modified forms of the above-described embodiments, or forms in which these forms are appropriately combined.

[0125] The contents described in some of the above-mentioned embodiments are understood, for example, as follows.

[0126] 1) A refrigeration system (1) according to at least one embodiment of the present disclosure comprises:

[0127] A turbomachine (2), the turbomachine (2) comprising:

[0128] Axis of rotation (3);

[0129] A compressor impeller (4) mounted on one side of the rotating shaft (3);

[0130] a turbine impeller (5) mounted on the other side of the rotating shaft (3);

[0131] an electric motor (6) mounted on the rotating shaft (3) between the compressor impeller (4) and the turbine impeller (5) and configured to generate a rotational force for rotating the rotating shaft (3);

[0132] a housing (7) configured to accommodate the rotating shaft (3), the compressor impeller (4), the turbine impeller (5), and the electric motor (6);

[0133] a compressed fluid pipeline (23) for guiding the fluid compressed by the compressor impeller (4) to the turbine impeller (5);

[0134] a cooler (24) disposed in the compressed fluid pipeline (23) and configured to perform heat exchange between the fluid flowing through the compressed fluid pipeline (23) and a cooling liquid;

[0135] A cooling liquid circulation pipeline (25), which is used to circulate the cooling liquid and is provided with a cooling device (34) for cooling the cooling liquid;

[0136] A coolant introduction pipeline (26) is used to extract the coolant from the coolant circulation pipeline (25) and introduce it into the interior of the shell (7).

[0137] According to the structure of 1) above, the coolant circulating in the coolant circulation pipe (25) is cooled in the cooling device (34), thereby maintaining a relatively low temperature. The refrigeration system (1) can cool the inside of the casing (7, turbomachinery 2) by extracting the coolant from the coolant circulation pipe (25) through the coolant introduction pipe (26) and introducing it into the inside of the casing (7) of the turbomachinery (2). In addition, according to the structure of 1) above, the coolant circulation pipe (25) provided in the refrigeration system (1) can be used as a cooling device for cooling the inside of the casing (7), and there is no need to separately provide the above-mentioned cooling device, so that the complexity of the structure of the refrigeration system (1) including the turbomachinery (2) can be suppressed.

[0138] 2) In some embodiments, the refrigeration system (1) as described in 1) above,

[0139] The housing (7) is formed with at least one of a motor-side internal space (160), a compressor-side internal space (170), or a turbine-side internal space (180).

[0140] The motor-side internal space (160) is formed inside the outer wall (16) of the housing (7), and the outer wall (16) covers the outer peripheral side of the motor room (13) that accommodates the electric motor (6).

[0141] The compressor side internal space (170) is formed inside a compressor side partition wall (17), and the compressor side partition wall (17) separates a compressor side storage space (11) storing the compressor impeller (4) from the motor chamber (13).

[0142] The turbine side internal space (180) is formed inside a turbine side partition wall (18), and the turbine side partition wall (18) separates a turbine side storage space (12) storing the turbine impeller (5) from the motor room (13).

[0143] The coolant introduction pipe (26) is connected to any one of the motor side internal space (160), the compressor side internal space (170), or the turbine side internal space (180).

[0144] According to the above-mentioned structure 2), the coolant is guided into any one of the motor side internal space (160), the compressor side internal space (170) or the turbine side internal space (180) via the coolant introduction pipe (26).

[0145] The outer wall (16) of the housing (7), the motor (6) and the motor chamber (13) can be cooled by the coolant guided to the motor side internal space (160). Thus, the heat generated by the motor (6) can be prevented from being transferred to the turbine side (the turbine side partition wall 18 or the turbine side internal space 180), and the heat input from the compressor side can be prevented from being transferred to the turbine side via the outer wall (16) of the housing (7) or the motor chamber (13).

[0146] The compressor side partition wall (17), the motor chamber (13) and the compressor side internal space (170) can be cooled by the coolant guided to the compressor side internal space (170). Thus, it is possible to suppress the heat input from the compressor side from being transferred to the motor (6) side (the outer wall 16 of the housing 7 or the motor chamber 13) via the compressor side partition wall (17). In addition, by cooling the fluid that passes through the compressor impeller (4) and flows through the compressor side storage space (11), the temperature of the fluid introduced into the compressed fluid pipeline (23) can be reduced, thereby achieving the improvement of the reliability and performance of the refrigerator (30, refrigeration cycle) including the compressed fluid pipeline (23).

[0147] The turbine side partition wall (18) can be cooled by the coolant guided to the turbine side internal space (180), thereby preventing heat input from the motor (6) or the compressor side from being transferred to the turbine side via the turbine side partition wall (18).

[0148] 3) In some embodiments, the refrigeration system (1) as described in 2) above,

[0149] The housing (7) is formed with the motor-side internal space (160), the compressor-side internal space (170), and a communication flow path (190) that connects the motor-side internal space (160) and the compressor-side internal space (170).

[0150] The coolant introduction pipeline (26) is connected to the motor-side internal space (160) or the compressor-side internal space (170).

[0151] According to the structure of 3) above, the coolant can flow between the motor side internal space (160) and the compressor side internal space (170) via the connecting flow path (190). Thus, the coolant can be guided to both the motor side internal space (160) and the compressor side internal space (170), and the outer wall (16) of the housing (7) and the compressor side partition wall (17) can be cooled by the coolant. In this case, since it is not necessary to provide a dedicated flow path for guiding the coolant to each of the motor side internal space (160) and the compressor side internal space (170), it is possible to suppress the complexity of the structure of the refrigeration system (1).

[0152] 4) In some embodiments, the refrigeration system (1) as described in 2) or 3) above,

[0153] The housing (7) is formed with the turbine-side internal space (180).

[0154] The turbomachine (2) further includes a heat insulating material (180A) disposed in the turbine-side internal space (180).

[0155] If the coolant is guided to the turbine side internal space (180), the coolant may become a heat source input to the turbine side storage space (12) depending on the temperature of the coolant guided to the turbine side internal space (180). According to the structure of 4), by arranging the heat insulating material (180A) in the turbine side internal space (180), it is possible to prevent the heat insulating material (180A) from becoming the above-mentioned input heat source, and at the same time, suppress the heat input from the motor (6) or the compressor side from being transferred to the above-mentioned turbine side through the turbine side partition wall (18).

[0156] 5) In some embodiments, the refrigeration system (1) as described in any one of 1) to 4) above,

[0157] The cooling liquid circulation pipeline (25) comprises:

[0158] a cooling liquid supply pipeline (25A) for conveying the cooling liquid from the cooling device (34) to the cooler (24);

[0159] a cooling liquid return line (25B) for conveying the cooling liquid from the cooler (24) to the cooling device (34);

[0160] The cooling liquid introduction pipeline (26) is connected to the cooling liquid supply pipeline (25A).

[0161] According to the structure of 5), the coolant cooled by the cooling device (34) can be introduced into the interior of the housing (7). In this case, compared with the case where the coolant heated by the cooler (24) is introduced into the interior of the housing (7), the coolant introduced into the interior of the housing (7) can be made low-temperature, so the interior of the housing (7) can be cooled more effectively by the coolant.

[0162] 6) In some embodiments, the refrigeration system (1) as described in any one of 1) to 5) above,

[0163] The fluid is composed of any one selected from helium, hydrogen, neon, nitrogen, argon, oxygen, air and hydrocarbons, or a mixture of two or more thereof.

[0164] According to the structure of 6) above, by setting the fluid flowing through the refrigerator (30, refrigeration cycle) including the compressed fluid pipeline (23) to a refrigerant that liquefies at a relatively low temperature (selected from any one of helium, hydrogen, neon, nitrogen, argon, oxygen, air and hydrocarbons, or a mixture of two or more), the corresponding temperature range of the above refrigerator (30, refrigeration cycle) can be expanded to include an extremely low temperature or ultra-low temperature range.

[0165] 7) In some embodiments, the refrigeration system (1) as described in any one of 1) to 6) above, further comprises:

[0166] Container body (27A);

[0167] a gas suction pipeline (fluid introduction pipeline 28) having a suction port (32) provided inside the container body (27A) and used for guiding the gas sucked from the inside of the container body (27A) through the suction port (32) as the fluid to the compressor impeller (4);

[0168] An expansion gas pipeline (inflation fluid pipeline 29) has a nozzle (33) arranged inside the container body (27A) and is used to guide the gas expanded by the turbine impeller (5) through the nozzle (33) to the inside of the container body (27A).

[0169] According to the structure of 7) above, a refrigerator (30, refrigeration cycle) is constructed that uses the gas inside the container body (27A) (gas inside the warehouse) as a heat medium. Since the gas inside the container body (27A) circulates naturally from the outlet (33) to the suction port (32) due to the difference between the pressure at the outlet (33) and the pressure at the suction port (32), a fan for circulating the gas is not required. Therefore, the temperature inside the warehouse will not rise due to the installation of a fan and a fan motor inside the container body (27A). As a result, it is easy to maintain the temperature inside the warehouse at the desired temperature. In addition, since a fan and a fan motor are not installed inside the container body (27A), the cargo space inside the container body (27A) can be ensured to be wider. Therefore, according to the structure of 7) above, a refrigerated container including a container body (27A) can be obtained, and the container body (27A) can suppress the reduction of the cargo space inside the container warehouse and can stably maintain the temperature inside the warehouse.

[0170] In order to use the refrigerated container including the container body (27A) for transportation purposes, the refrigeration system (1) is required to be miniaturized and lightweight. In order to meet the above requirements, when the turbomachine (2) is miniaturized, the distance between the compressor impeller (4) and the turbine impeller (5) is closer, and the heat is easily input from the compressor side to the turbine side. Therefore, the heat insulation structure made of coolant or heat insulation material can be particularly effective.

[0171] 8) In some embodiments, the refrigeration system (1) as described in any one of 1) to 7) above,

[0172] The housing (7) includes a motor chamber (13) for accommodating the motor (6).

[0173] The refrigeration system (1) further comprises: a cold and hot medium supply pipeline (61), one end of which is connected to the compressed fluid pipeline (23) at a downstream side of the cooler (24), and is used to extract the fluid from the compressed fluid pipeline (23) and supply it to the interior of the motor room (13) as a cold and hot medium for cooling the motor (6);

[0174] A cold and hot medium return pipeline (62) is used to return the fluid supplied to the motor room (13) via the cold and hot medium supply pipeline (61) to a fluid introduction pipeline (28), wherein the fluid introduction pipeline (28) is used to guide the fluid to the compressor impeller (4).

[0175] According to the structure of 8), since the refrigeration system (1) includes the cold and hot medium supply pipeline (61) and the cold and hot medium return pipeline (62), the fluid cooled in the cooler (24) can be used for cooling the motor (6, motor chamber 13), and the fluid that has cooled the motor (6) can be returned to the fluid introduction pipeline (28). In this case, a part of the refrigeration cycle (compressed fluid pipeline 23 or fluid introduction pipeline 28, etc.) can be used as a flow path for the cold and hot medium (the above-mentioned fluid) for cooling the motor (6), thereby achieving a compact and lightweight structure of the refrigeration system (1).

[0176] 9) In some embodiments, the refrigeration system (1) as described in 8) above,

[0177] The minimum area (D2) of the flow path (62A) through which the cold and hot medium flows in the cold and hot medium return pipeline (62) is smaller than the minimum area (D1) of the flow path (61A) through which the cold and hot medium flows in the cold and hot medium supply pipeline (61).

[0178] According to the structure of 9), by making the minimum area (D2) of the flow path (62A) through which the cold and hot medium flows in the cold and hot medium return pipe (62) smaller than the minimum area (D1) of the flow path (61A) through which the cold and hot medium flows in the cold and hot medium supply pipe (61), pressure can be accumulated in the motor room (13). As a result, since the pressure difference between the pressure inside the motor room (13) and the pressure inside the compressor side storage space (11) is small, the leakage of the gas flowing through the compressor side storage space (11) from the compressor side storage space (11) to the motor room (13) can be reduced, and the temperature rise inside the motor room (13) caused by the relatively high temperature gas leaking from the compressor side storage space (11) to the motor room (13) can be suppressed.

[0179] 10) In some embodiments, the refrigeration system (1) as described in 8) or 9) above,

[0180] The cold and hot medium supply pipeline (61) has a cold and hot medium inlet (611), and the cold and hot medium inlet (611) is used to allow the cold and hot medium to flow from the cold and hot medium supply pipeline (61) into the interior of the motor room (13).

[0181] The cold and hot medium return pipeline (62) has a cold and hot medium introduction port (621), and the cold and hot medium introduction port (621) is used to introduce the cold and hot medium supplied to the inside of the motor room (13) into the cold and hot medium return pipeline (62).

[0182] The cold and hot medium introduction port (621) is formed on a side closer to the compressor impeller (4) than the cold and hot medium inlet port (611) in the axial direction of the rotating shaft (3).

[0183] According to the structure of 10), the cold and hot medium inlet (621) is formed on the side of the compressor impeller (4) that is closer to the cold and hot medium inlet (611) in the axial direction. In this case, the gas leaking from the compressor side storage space (11) to the motor room (13) or the leaked gas can be quickly discharged to the cold and hot medium return pipe (62) through the cold and hot medium inlet (621). As a result, the temperature rise inside the motor room (13) caused by the gas leaking from the compressor side storage space (11) to the motor room (13) or the leaked gas can be suppressed.

[0184] 11) In some embodiments, the refrigeration system (1) as described in any one of 8) to 10) above,

[0185] The housing (7) is formed with a compressor-side communicating hole (14), wherein the compressor-side communicating hole (14) connects a motor chamber (13) accommodating the electric motor (6) with a compressor-side housing space (11) accommodating the compressor impeller (4), and allows the rotating shaft (3) to be inserted therethrough.

[0186] The refrigeration system (1) further comprises:

[0187] a compressor side bearing (8) disposed in the compressor side communicating hole (14) and configured to rotatably support the rotating shaft (3); and

[0188] A compressor side sealing portion (19) configured to seal between the compressor side communicating hole (14) and the rotating shaft (3) at a side of the compressor side communicating hole (14) closer to the compressor side housing space (11) than the compressor side bearing (8);

[0189] The cold and hot medium return pipeline (62) has a cold and hot medium introduction port (621A), and the cold and hot medium introduction port (621A) is used to introduce the cold and hot medium supplied to the inside of the motor room (13) into the cold and hot medium return pipeline (62).

[0190] The cold and hot medium introduction port (621A) is formed between the compressor side bearing (8) and the compressor side sealing portion (19) in the compressor side communication hole (14).

[0191] According to the structure of 11), the cold / hot medium inlet (621A) is formed between the compressor side bearing (8) and the compressor side seal (19) in the compressor side communication hole (14). In this case, the relatively high temperature gas guided from the compressor side storage space (11) to the compressor side communication hole (14) can be quickly discharged to the cold / hot medium return pipe (62) via the cold / hot medium inlet (621A). As a result, since the gas leaking from the compressor side storage space (11) to the motor room (13) can be reduced, the temperature rise inside the motor room (13) caused by the leaked gas can be suppressed.

[0192] According to the structure of 11) above, the temperature rise of the compressor side bearing (8) caused by the relatively high temperature gas guided to the compressor side communication hole (14) can be suppressed. In addition, the compressor side bearing (8) can be cooled by a fluid, and the fluid is introduced into the interior of the motor chamber (13) via the cold and hot medium supply pipeline (61). In this case, since the temperature of the compressor side bearing (8) can be maintained at a relatively low temperature, the performance degradation and thermal damage of the compressor side bearing (8) caused by the temperature rise can be suppressed, thereby achieving an improvement in the reliability of the turbomachinery (2) including the compressor side bearing (8).

[0193] Reference numerals

[0194] 1 Refrigeration system

[0195] 2 Turbomachinery

[0196] 3 Rotation Axis

[0197] 4 Compressor impeller

[0198] 4A centrifugal compressor

[0199] 5 Turbine impeller

[0200] 5A expander

[0201] 6 Electric Motor

[0202] 7 Housing

[0203] 8 Compressor side bearing

[0204] 9 Turbine side bearing

[0205] 11 Compressor side storage space

[0206] 12 Turbine side storage space

[0207] 13. Motor room

[0208] 14 Compressor side connecting hole

[0209] 15 Turbine side connecting hole

[0210] 16 outer wall

[0211] 17 Compressor side partition wall

[0212] 18 Turbine side partition wall

[0213] 19 Compressor side seal

[0214] 21 Compressor housing

[0215] 22 Turbine housing

[0216] 23 Compressed fluid pipeline

[0217] 24 Cooler

[0218] 25 Coolant circulation line

[0219] 25A Coolant supply line

[0220] 25B Coolant return line

[0221] 26 Coolant inlet pipe

[0222] 27 Fluid supply destination

[0223] 27A Container body

[0224] 28 Fluid inlet pipeline

[0225] 29 Expansion fluid line

[0226] 30 Refrigeration machine

[0227] 31 Heat exchanger

[0228] 32 suction port

[0229] 33. Spout

[0230] 34 Cooling device

[0231] 35 Radiator

[0232] 36 Pumps

[0233] 37 Fan

[0234] 38 Coolant recovery line

[0235] 39 Coolant flow regulator

[0236] 41, 51 wheels

[0237] 42 Impeller blades

[0238] 43, 53 outer surface

[0239] 44, 54 Back

[0240] 52 Turbine Blades

[0241] 61 Cold and hot medium supply pipeline

[0242] 62 Cold and hot medium return pipeline

[0243] 63 Cold and hot medium supply quantity regulating device

[0244] 160 Internal space on the motor side

[0245] 161 Inner surface

[0246] 170 Internal space on compressor side

[0247] 171 Compressor side back

[0248] 172 Inner surface of compressor side

[0249] 180 Turbine side internal space

[0250] 180A thermal insulation material

[0251] 181 Turbine side back

[0252] 182 Turbine side inner surface

[0253] 190 Connecting flow path

[0254] 191 First Opening

[0255] 192 Second Opening

[0256] 211 Fluid inlet flow path

[0257] 212 Fluid introduction flow path forming portion

[0258] 213, 221 Vortex flow path

[0259] 214, 222 Swirl flow path forming portion

[0260] 223 Fluid discharge path

[0261] 224 Discharge flow path forming part

[0262] 261 Coolant outlet

[0263] 270 Inner Space

[0264] 311 Low temperature side heat exchange unit

[0265] 312 High temperature side heat exchange unit

[0266] 381 Coolant suction port

[0267] 611 Cold and hot medium inlet

[0268] 621, 621A Cold and hot medium inlet

[0269] Minimum area of ​​D1 and D2

[0270] LA Axis

[0271] P1, P2, P3, P4 connection position

Claims

1. A refrigeration system, characterized in that: include: A turbomachinery, the turbomachinery comprising: Axis of rotation; a compressor impeller mounted on one side of the rotating shaft; a turbine impeller mounted on the other side of the rotating shaft; an electric motor mounted on the rotating shaft between the compressor impeller and the turbine impeller and configured to generate a rotational force for rotating the rotating shaft; a housing configured to accommodate the rotating shaft, the compressor impeller, the turbine impeller, and the electric motor; a compressed fluid line for guiding the fluid compressed by the compressor impeller to the turbine impeller; a cooler disposed in the compressed fluid pipeline and configured to perform heat exchange between the fluid flowing through the compressed fluid pipeline and a cooling liquid; A coolant circulation pipeline, which is used to circulate the coolant and is provided with a cooling device for cooling the coolant; The coolant introduction pipeline is used to extract the coolant from the coolant circulation pipeline and introduce it into the interior of the shell.

2. The refrigeration system according to claim 1, characterized in that: The housing is formed with at least one of a motor-side internal space, a compressor-side internal space, or a turbine-side internal space, The motor-side internal space is formed inside the outer wall of the housing, and the outer wall of the housing covers the outer peripheral side of the motor room accommodating the electric motor. The compressor side internal space is formed inside the compressor side partition wall, and the compressor side partition wall separates the compressor side storage space storing the compressor impeller from the motor chamber. The turbine side internal space is formed inside the turbine side partition wall, and the turbine side partition wall separates the turbine side storage space storing the turbine impeller from the motor chamber. The coolant introduction pipe is connected to any one of the motor-side internal space, the compressor-side internal space, or the turbine-side internal space.

3. The refrigeration system according to claim 2, characterized in that: The housing is formed with the motor-side internal space, the compressor-side internal space, and a communication flow path that connects the motor-side internal space with the compressor-side internal space. The coolant introduction pipeline is connected to the motor side internal space or the compressor side internal space.

4. The refrigeration system according to claim 2 or 3, characterized in that: The casing forms the turbine-side internal space, The turbomachine further includes a heat insulating material disposed in the turbine-side internal space.

5. The refrigeration system according to any one of claims 1 to 3, characterized in that: The coolant circulation pipeline comprises: a coolant supply pipeline, used for conveying the coolant from the cooling device to the cooler; a coolant return line, used for conveying the coolant from the cooler to the cooling device; The coolant introduction pipeline is connected to the coolant supply pipeline.

6. The refrigeration system according to any one of claims 1 to 3, characterized in that: The fluid is composed of any one selected from helium, hydrogen, neon, nitrogen, argon, oxygen, air and hydrocarbons, or a mixture of two or more thereof.

7. The refrigeration system according to any one of claims 1 to 3, characterized in that: Also includes: Container body; a gas suction pipeline having a suction port provided inside the container body and used for guiding the gas sucked from the inside of the container body through the suction port to the compressor impeller as the fluid; An expansion gas pipeline has a discharge port provided inside the container body and is used to guide the gas expanded by the turbine impeller through the discharge port to the inside of the container body through the suction port.

8. The refrigeration system according to any one of claims 1 to 3, characterized in that: The housing includes a motor chamber for accommodating the motor. The refrigeration system further comprises: a cold and hot medium supply pipeline, one end of which is connected to the compressed fluid pipeline on the downstream side of the cooler, for extracting the fluid from the compressed fluid pipeline and supplying it to the interior of the motor room as a cold and hot medium for cooling the motor; The cold and hot medium return pipeline is used to return the fluid supplied to the motor chamber via the cold and hot medium supply pipeline to the fluid introduction pipeline, and the fluid introduction pipeline is used to guide the fluid to the compressor impeller.

9. The refrigeration system according to claim 8, characterized in that: The minimum area of ​​the flow path through which the cold and hot medium flows in the cold and hot medium return pipeline is smaller than the minimum area of ​​the flow path through which the cold and hot medium flows in the cold and hot medium supply pipeline.

10. The refrigeration system according to claim 8, characterized in that The cold and hot medium supply pipeline has a cold and hot medium flow inlet, and the cold and hot medium flow inlet is used to allow the cold and hot medium to flow from the cold and hot medium supply pipeline into the interior of the motor room. The cold and hot medium return pipeline has a cold and hot medium introduction port, and the cold and hot medium introduction port is used to introduce the cold and hot medium supplied to the inside of the motor room into the cold and hot medium return pipeline. The cold / hot medium introduction port is formed on a side closer to the compressor impeller than the cold / hot medium inlet port in the axial direction of the rotating shaft.

11. The refrigeration system according to claim 8, characterized in that The housing is formed with a compressor-side communicating hole, the compressor-side communicating hole communicating with the motor chamber accommodating the electric motor and the compressor-side accommodating space accommodating the compressor impeller, and allowing the rotating shaft to pass therethrough. The refrigeration system further comprises: a compressor side bearing disposed in the compressor side communicating hole and configured to rotatably support the rotating shaft; a compressor side sealing portion configured to seal between the compressor side communicating hole and the rotating shaft on a side of the compressor side housing space that is closer to the compressor side bearing than the compressor side communicating hole; The cold and hot medium return pipeline has a cold and hot medium introduction port, and the cold and hot medium introduction port is used to introduce the cold and hot medium supplied to the inside of the motor room into the cold and hot medium return pipeline. The cold / hot medium introduction port is formed between the compressor-side bearing and the compressor-side seal portion in the compressor-side communication hole.

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