Thrust magnetic bearing

Abstract

A thrust magnetic bearing includes a coil (20) and an iron core (30), the coil (20) being constructed by winding a wire. The iron core (30) houses the coil (20). A refrigerant inlet (61) and a refrigerant outlet (62) are provided on the iron core (30). A refrigerant flow path (65) is provided between the coil (20) and the iron core (30) to connect the refrigerant inlet (61) and the refrigerant outlet (62). The refrigerant flow path (65) is configured such that the refrigerant flowing from the refrigerant inlet (61) toward the refrigerant outlet (62) flows mainly along the coil (20) in the winding direction of the coil (20).

Description

Technical Field

[0001] This disclosure relates to a thrust magnetic bearing. Background Technology

[0002] Thrust magnetic bearings are disclosed in Patent Document 1. These thrust magnetic bearings include a stator and a rotor with coils.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Publication No. 2019-173823 Summary of the Invention

[0006] -The technical problem the invention aims to solve-

[0007] However, Patent Document 1 does not address how to cool the coil of the thrust magnetic bearing.

[0008] - Technical solutions used to solve technical problems -

[0009] The first aspect of this disclosure relates to a thrust magnetic bearing comprising a coil 20 and an iron core 30, the coil 20 being constructed by winding a wire, the iron core 30 housing the coil 20, a refrigerant inlet 61 and a refrigerant outlet 62 being provided on the iron core 30, and a refrigerant flow path 65 being provided between the coil 20 and the iron core 30, the refrigerant flow path 65 connecting the refrigerant inlet 61 and the refrigerant outlet 62, the refrigerant flow path 65 being configured such that refrigerant flowing from the refrigerant inlet 61 toward the refrigerant outlet 62 flows primarily along the coil 20 in the winding direction of the coil 20.

[0010] In the first aspect, since the refrigerant can flow mainly along the coil 20 in the winding direction of the coil 20, the coil 20 can be cooled effectively.

[0011] A second aspect of this disclosure is that, based on the thrust magnetic bearing of the first aspect, the refrigerant flow path 65 has a main flow path 66 that extends along the coil 20 in the winding direction of the coil 20.

[0012] In the second aspect, the refrigerant can be made to flow primarily along the winding direction of the coil 20 via the main flow path 66. This allows for effective cooling of the coil 20.

[0013] A third aspect of this disclosure is, based on the thrust magnetic bearing of the second aspect, characterized in that: the thrust magnetic bearing includes an insulating component 40, the insulating component 40 insulating the coil 20 from the iron core 30, the insulating component 40 being arranged on both axial sides and radially inner sides of the coil 20, and the main flow path 66 including a gap between the radially outer side of the coil 20 and the iron core 30.

[0014] In the third aspect, the refrigerant can be made to flow primarily in the gap between the radially outer side of the coil 20 and the iron core 30. It should be noted that the gap between the radially outer side of the coil 20 and the iron core 30 extends along the coil 20 in the winding direction. Therefore, since the refrigerant can be made to flow primarily along the coil 20 in the winding direction, the coil 20 can be effectively cooled.

[0015] A fourth aspect of this disclosure is, based on the thrust magnetic bearing of the third aspect, characterized in that: the thrust magnetic bearing includes a blocking member 70 that blocks the flow of the refrigerant in the gap between the core 30 and the wall portion 41 of the insulating member 40, the wall portion 41 of the insulating member 40 being arranged at the axial end 21 of the coil 20.

[0016] In the fourth aspect, by preventing the flow of refrigerant in the gap between the core 30 and the wall 41 of the insulating component 40, the refrigerant is made to flow easily into the main flow path 66. In this way, the refrigerant is made to flow mainly along the coil 20 in the winding direction of the coil 20, thereby easily and effectively cooling the coil 20.

[0017] The fifth aspect of this disclosure is, based on the thrust magnetic bearing of the third aspect, characterized in that: the refrigerant flow path 65 has the main flow path 66 and the secondary flow path 67, the secondary flow path 67 including the gap between the core 30 and the wall portion 41 of the insulating member 40, the wall portion 41 of the insulating member 40 being arranged at the axial end 21 of the coil 20.

[0018] In the fifth aspect, the refrigerant flow rate in the main flow path 66 is greater than the refrigerant flow rate in the secondary flow path 67. Therefore, since the refrigerant can flow mainly along the winding direction of the coil 20, the coil 20 can be cooled effectively.

[0019] The sixth aspect of this disclosure is that, based on the thrust magnetic bearing of the fifth aspect, the main flow path 66 has a larger flow path cross-sectional area than the secondary flow path 67.

[0020] In the sixth aspect, by making the flow path cross-sectional area of ​​the main flow path 66 larger than that of the secondary flow path 67, the flow rate of refrigerant in the main flow path 66 can be greater than that in the secondary flow path 67. This allows the refrigerant to flow primarily along the winding direction of the coil 20, thereby effectively cooling the coil 20.

[0021] The seventh aspect of this disclosure is, based on the thrust magnetic bearing of the third aspect, characterized in that: a through hole 35 is provided on the iron core 30 at a position radially inner than the coil 20, the through hole 35 penetrates the iron core 30 along the axial direction, a shaft 14 is inserted into the through hole 35, the refrigerant flows inside the shaft 14, the shaft 14 can release the refrigerant radially by rotation, and the refrigerant inlet 61 opens on the inner circumferential surface of the through hole 35.

[0022] In the seventh aspect, the refrigerant released from the shaft 14 flows into the refrigerant flow path 65 through the refrigerant inlet 61, which opens on the inner circumferential surface of the through hole 35. In this way, the coil 20 can be effectively cooled using the refrigerant released from the shaft 14.

[0023] The eighth aspect of this disclosure is, based on the thrust magnetic bearing of the seventh aspect, characterized in that: the refrigerant flow path 65 has the main flow path 66 and the connecting flow path 68, the connecting flow path 68 including the gap between the core 30 and the wall portion 41 of the insulating member 40, the wall portion 41 of the insulating member 40 being arranged at the axial end 21 of the coil 20, and the connecting flow path 68 connecting the refrigerant inlet 61 to the main flow path 66.

[0024] In the eighth aspect, the refrigerant can flow from the refrigerant inlet 61 to the main flow path 66 through the gap between the core 30 and the wall 41 of the insulating component 40.

[0025] The ninth aspect of this disclosure is, based on the thrust magnetic bearing of the seventh aspect, characterized in that: a groove 41g extending radially is provided on the surface of the wall portion 41 of the insulating member 40 opposite to the core 30, the wall portion 41 of the insulating member 40 is arranged at the axial end 21 of the coil 20, the refrigerant flow path 65 has the main flow path 66 and the connecting flow path 68, the connecting flow path 68 includes the groove 41g of the wall portion 41 of the insulating member 40, and the connecting flow path 68 connects the refrigerant inlet 61 to the main flow path 66.

[0026] In the ninth aspect, the refrigerant can flow from the refrigerant inlet 61 to the main flow path 66 through the groove 41g of the wall portion 41 of the insulating member 40.

[0027] The tenth aspect of this disclosure is, based on the thrust magnetic bearing of any of the third to ninth aspects, characterized in that: the thrust magnetic bearing includes partitions 80, 81, and 82, which are disposed in the gap between the radially outer side of the coil 20 and the iron core 30.

[0028] In the tenth aspect, by providing baffles 80, 81, and 82 in the gap between the radial outer side of the coil 20 and the iron core 30, the flow of refrigerant in the gap between the radial outer side of the coil 20 and the iron core 30 can be regulated.

[0029] The eleventh aspect of this disclosure is, based on the thrust magnetic bearing of the tenth aspect, characterized in that: the partitions 80, 81, and 82 divide the gap between the radially outer side of the coil 20 and the iron core 30 into multiple flow paths.

[0030] In the eleventh aspect, by dividing the gap between the radial outer side of the coil 20 and the iron core 30 into multiple flow paths, it is possible to suppress the deflection of refrigerant in the gap between the radial outer side of the coil 20 and the iron core 30.

[0031] The twelfth aspect of this disclosure is, based on the thrust magnetic bearing of the tenth or eleventh aspect, characterized in that: the partitions 81 and 82 divide the gap between the radially outer side of the coil 20 and the iron core 30 along the winding direction.

[0032] In the twelfth aspect, it is possible to suppress the refrigerant from flowing off-center in the winding direction in the gap between the radially outer side of the coil 20 and the core 30.

[0033] The thirteenth aspect of this disclosure is, based on the thrust magnetic bearing of the tenth or eleventh aspect, characterized in that: the partition 80 divides the gap between the radially outer side of the coil 20 and the iron core 30 along the axial direction, a notch 80a is provided on the partition 80, the notch 80a allows the refrigerant to pass through along the axial direction, and at least one of the refrigerant inlet 61 and the refrigerant outlet 62 is located at a position that avoids overlapping with the notch 80a when viewed along the axial direction.

[0034] In the thirteenth aspect, it is possible to prevent the refrigerant from flowing in a straight axial direction from the refrigerant inlet 61 toward the refrigerant outlet 62. In this way, the refrigerant can easily flow along the coil 20 in the winding direction of the coil 20, thus effectively cooling the coil 20.

[0035] The fourteenth aspect of this disclosure is, based on the thrust magnetic bearing of any of the first to twelfth aspects, characterized in that: the refrigerant outlet 62 is located at a position that avoids being visible from the refrigerant inlet 61 when viewed along the axial direction of the coil 20.

[0036] In the fourteenth aspect, it is possible to prevent the refrigerant from flowing in a straight line axially from the refrigerant inlet 61 toward the refrigerant outlet 62. In this way, the refrigerant can easily flow along the coil 20 in the winding direction of the coil 20, thus effectively cooling the coil 20.

[0037] The fifteenth aspect of this disclosure is, based on the thrust magnetic bearing of any of the first to fourteenth aspects, characterized in that: the refrigerant flow path 65 faces the coil 20.

[0038] In the fifteenth aspect, compared with the case where the refrigerant flow path 65 does not face the coil 20, the coil 20 can be cooled more effectively.

[0039] The sixteenth aspect of this disclosure is, based on the thrust magnetic bearing of any of the first to fifteenth aspects, characterized in that: the refrigerant pressure at the refrigerant inlet 61 is higher than the refrigerant pressure at the refrigerant outlet 62.

[0040] In the sixteenth aspect, the refrigerant can be made to flow in the refrigerant flow path 65 by utilizing the refrigerant pressure difference between the refrigerant inlet 61 and the refrigerant outlet 62. Attached Figure Description

[0041] Figure 1 This is a longitudinal sectional view illustrating the structure of a turbo compressor;

[0042] Figure 2 This is a cross-sectional perspective view illustrating the structure of a thrust magnetic bearing according to an embodiment.

[0043] Figure 3 This is a cross-sectional perspective view illustrating the structure of a comparative example of a thrust magnetic bearing;

[0044] Figure 4 This is a cross-sectional perspective view of the structure of the thrust magnetic bearing, which illustrates a variation of the embodiment 1.

[0045] Figure 5 This is a cross-sectional perspective view of the structure of the thrust magnetic bearing, which illustrates a modified example 2 of the embodiment.

[0046] Figure 6 This is a cross-sectional perspective view of the structure of the thrust magnetic bearing, which illustrates a variation of the embodiment 3.

[0047] Figure 7 This is a cross-sectional perspective view of the structure of the thrust magnetic bearing, which illustrates a variation of the implementation method, Example 4.

[0048] Figure 8 This is a cross-sectional perspective view of the structure of the thrust magnetic bearing, which illustrates a variation of the embodiment 5.

[0049] Figure 9 This is a top view illustrating the structure of the partition in Modified Example 5 of the embodiment.

[0050] Figure 10 This is a cross-sectional perspective view of the structure of the thrust magnetic bearing, which illustrates a variation of the implementation method, Example 6.

[0051] Figure 11 This is a cross-sectional perspective view of the structure of the thrust magnetic bearing, which illustrates a variation of the embodiment 7.

[0052] Figure 12 This is a top view illustrating the structure of the insulating component of Modified Example 7 of the embodiment;

[0053] Figure 13 This is a cross-sectional perspective view of the structure of the thrust magnetic bearing, which illustrates a variation of the embodiment, Example 8.

[0054] Figure 14 This is a top view illustrating the structure of the insulating component of Modified Example 8 of the embodiment;

[0055] Figure 15 This is a top view of a portion of the structure of the thrust magnetic bearing, which exemplifies a variation of the embodiment, Example 9. Detailed Implementation

[0056] The embodiments will now be described in detail with reference to the accompanying drawings. It should be noted that the same or corresponding parts are indicated by the same symbols in the drawings, and will not be described again.

[0057] (Implementation Method)

[0058] Figure 1 The structure of the turbo compressor 10 according to the embodiment is illustrated. The turbo compressor 10 includes a housing 11, an impeller 12, an electric motor 13, a shaft 14, a touchdown bearing 15, a thrust magnetic bearing 16, a radial magnetic bearing 17, a control unit 18, and a power supply unit 19.

[0059] 〔case〕

[0060] The housing 11 is formed as a closed cylinder at both ends, with its axis oriented horizontally. The space inside the housing 11 is divided by a wall 11a. The space forward of the wall 11a forms an impeller space S1 for housing the impeller 12, and the space rearward of the wall 11a forms a drive mechanism space S2 for housing the motor 13, the bottom bearing 15, the thrust magnetic bearing 16, and the radial magnetic bearing 17. A shaft 14 connects the impeller 12 in the impeller space S1 and the motor 13 in the drive mechanism space S2.

[0061] 〔impeller〕

[0062] The impeller 12 is formed by multiple blades and has an approximately conical shape. The impeller 12 is housed in the impeller space S1, fixed to one end of the shaft 14. The impeller space S1 is connected to a suction pipe 12a and a discharge pipe 12b, and a compression space S12 is formed on the outer periphery of the impeller space S1. When the impeller 12 rotates, fluid is guided from the outside into the impeller space S1 through the suction pipe 12a. The fluid guided into the impeller space S1 is compressed in the compression space S12, and the high-pressure fluid in the compression space S12 returns to the outside through the discharge pipe 12b.

[0063] [Electric motor]

[0064] The electric motor 13 drives the shaft 14 to rotate. The electric motor 13 has a stator 13a and a rotor 13b. The stator 13a is fixed to the inner peripheral wall of the housing 11, and the rotor 13b is fixed to the shaft 14. The rotor 13b is arranged inside the stator 13a with its outer peripheral surface facing the inner peripheral surface of the stator 13a through a predetermined gap.

[0065] [Bottom-out bearing]

[0066] When the thrust magnetic bearing 16 and the radial magnetic bearing 17 are not working and the shaft 14 is not suspended, the bottom bearing 15 contacts the shaft 14 and supports the shaft 14.

[0067] Thrust magnetic bearing

[0068] The thrust magnetic bearing 16 uses electromagnetic force to control the position of the shaft 14 in the thrust direction in a non-contact manner. The thrust magnetic bearing 16 has a stator 16a and a rotor 16b. The stator 16a is fixed to the inner peripheral wall of the housing 11, and the rotor 16b is fixed to the shaft 14. The rotor 16b is arranged opposite the stator 16a in the thrust direction of the shaft 14 with a predetermined gap.

[0069] In this example, two thrust magnetic bearings 16 are provided. One of the two thrust magnetic bearings 16 is arranged on one end of the shaft 14, and the other thrust magnetic bearing 16 is arranged on the other end of the shaft 14 (opposite to the impeller 12).

[0070] Radial magnetic bearings

[0071] The radial magnetic bearing 17 uses electromagnetic force to control the radial position of the shaft 14 in a non-contact manner. The radial magnetic bearing 17 has a stator 17a and a rotor 17b. The stator 17a is fixed to the inner peripheral wall of the housing 11, and the rotor 17b is fixed to the shaft 14. The rotor 17b is arranged inside the stator 17a in a radial direction relative to the stator 17a with a predetermined gap.

[0072] In this example, two radial magnetic bearings 17 are provided. The two radial magnetic bearings 17 are arranged between two thrust magnetic bearings 16. An electric motor 13 is arranged between the two radial magnetic bearings 17. One of the two radial magnetic bearings 17 is arranged on one end of the shaft 14, and the other radial magnetic bearing 17 is arranged on the other end of the shaft 14 (opposite to the impeller 12 side).

[0073] <Non-magnetic rings>

[0074] In this example, a non-magnetic ring 14a is provided between the rotor 16b of the thrust magnetic bearing 16 and the rotor 17b of the radial magnetic bearing 17.

[0075] [Various sensors]

[0076] Various sensors, such as gap sensors, are installed on the thrust magnetic bearing 16 and the radial magnetic bearing 17 (illustrations omitted). For example, the thrust magnetic bearing 16 is equipped with a thrust gap sensor (illustrations omitted) that detects the gap between the stator 16a and the rotor 16b in the thrust direction; the radial magnetic bearing 17 is equipped with a radial gap sensor (illustrations omitted) that detects the gap between the stator 17a and the rotor 17b in the X-axis direction (an example of radial direction), and a radial gap sensor (illustrations omitted) that detects the gap between the stator 17a and the rotor 17b in the Y-axis direction (an example of radial direction). The detection signals (detection results) from these various sensors are sent to the control unit 18.

[0077] [Control Department]

[0078] The control unit 18 outputs command values ​​for controlling the current supplied to each thrust magnetic bearing 16 and each radial magnetic bearing 17 based on detection signals from various sensors (such as thrust clearance sensors, radial clearance sensors, etc.) installed on the thrust magnetic bearing 16 and radial magnetic bearing 17, so that the position of the shaft 14 is at the desired position. For example, the control unit 18 consists of a processor and a memory, which is electrically connected to the processor and stores programs and information for making the processor work.

[0079] [Power Supply Section]

[0080] The power supply unit 19 supplies current to the thrust magnetic bearing 16 and the radial magnetic bearing 17 respectively according to the command value output from the control unit 18. For example, the power supply unit 19 is composed of a PWM amplifier.

[0081] (Thrust magnetic bearing)

[0082] Figure 2The structure of the thrust magnetic bearing 16 according to the embodiment is illustrated. The stator 16a of the thrust magnetic bearing 16 includes a coil 20, an iron core 30, and an insulating component 40. It should be noted that, in Figure 2 The rotor 16b of the thrust magnetic bearing 16 is omitted from the diagram.

[0083] [Coil]

[0084] The coil 20 is constructed by winding a wire.

[0085] Hereinafter, the direction of the winding axis Q of coil 20 will be referred to as "axial direction", and the direction orthogonal to the direction of the winding axis Q of coil 20 will be referred to as "radial direction". The cross section along the axial direction will be referred to as "longitudinal cross section". It should be noted that the winding axis Q is the winding axis of the coil 20 being wound.

[0086] In this example, coil 20 is formed in a loop shape. The longitudinal cross-sectional shape of coil 20 is rectangular. Coil 20 has one axial end, namely the first end 21, and another axial end, namely the second end 22.

[0087] 〔core〕

[0088] The iron core 30 houses the coil 20. The iron core 30 surrounds the radial outer side of the coil 20. A gap is formed between the radial outer side of the coil 20 and the iron core 30. For example, the iron core 30 is a laminated iron core constructed by stacking electromagnetic steel plates. It should be noted that the iron core 30 can also be made of other magnetic materials such as powder-coated magnetic cores.

[0089] A through hole 35 is provided on the iron core 30. The through hole 35 passes through the iron core 30 axially at a position radially inward of the coil 20. A shaft 14 is inserted through the through hole 35.

[0090] In this example, the core 30 is formed in a ring shape. The longitudinal cross-sectional shape of the core 30 is a U-shape that opens radially inward. Specifically, the core 30 has a first core 31 and a second core 32.

[0091] The first iron core 31 and the second iron core 32 are arranged axially. The first iron core 31 forms one axial end of the iron core 30, and the second iron core 32 forms the other axial end of the iron core 30. The first iron core 31 and the second iron core 32 are each formed into annular shapes. The longitudinal cross-sectional shape of the first iron core 31 is L-shaped. The longitudinal cross-sectional shape of the second iron core 32 is rectangular. The inner circumferential surfaces of the first iron core 31 and the second iron core 32 form through holes 35.

[0092] A housing portion 50 for housing the coil 20 is formed between the first iron core 31 and the second iron core 32. The housing portion 50 is formed in a ring shape. The longitudinal cross-sectional shape of the housing portion 50 is rectangular.

[0093] The receiving portion 50 has one axial end, namely a first end 51, and another axial end, namely a second end 52. The first end 51 of the receiving portion 50 is axially opposite to the first end 21 of the coil 20. The second end 52 of the receiving portion 50 is axially opposite to the second end 22 of the coil 20. The radially outer side (in this example, the outer peripheral surface) of the receiving portion 50 is opposite to the radially outer side (in this example, the outer peripheral surface) of the coil 20.

[0094] It should be noted that a gap is formed between the radial outer side of the receiving part 50 and the radial outer side of the coil 20. This gap corresponds to the gap between the radial outer side of the coil 20 and the iron core 30.

[0095] [Insulating components]

[0096] Insulating component 40 insulates coil 20 from core 30. Insulating component 40 is arranged on both axial sides and radially inward sides of coil 20. Insulating component 40 and coil 20 are housed together in core 30.

[0097] In this example, the insulating member 40 is formed in a ring shape. The longitudinal cross-sectional shape of the insulating member 40 is a U-shape that opens radially outward. Specifically, the insulating member 40 has an axially oriented wall portion, namely a first wall portion 41, an axially oriented wall portion, namely a second wall portion 42, and a connecting portion 43 that connects the first wall portion 41 and the second wall portion 42.

[0098] A first wall portion 41 of the insulating member 40 is disposed at the first end portion 21 of the coil 20. A second wall portion 42 of the insulating member 40 is disposed at the second end portion 22 of the coil 20. A connecting portion 43 of the insulating member 40 is disposed radially inward of the coil 20 (in this example, on the inner circumferential surface). The insulating member 40 and the coil 20 are housed together in a housing portion 50. The first wall portion 41 of the insulating member 40 is axially opposite to the first end portion 51 of the housing portion 50. The second wall portion 42 of the insulating member 40 is axially opposite to the second end portion 52 of the housing portion 50.

[0099] It should be noted that a gap is formed between the core 30 and the first wall portion 41 of the insulating component 40, which is located at the first end 21 of the coil 20. Specifically, a gap is formed between the first end 51 of the receiving portion 50 and the first wall portion 41 of the insulating component 40.

[0100] [Refrigerant inlet and refrigerant outlet]

[0101] A refrigerant inlet 61 and a refrigerant outlet 62 are provided on the iron core 30.

[0102] In this example, the refrigerant inlet 61 is located at one end of the core 30 along its axial direction. Specifically, the refrigerant inlet 61 extends axially through the first core 31. A connecting hole is provided on the first wall portion 41 of the insulating member 40, which connects the refrigerant inlet 61 and the gap between the radially outer side of the coil 20 and the radially outer side of the receiving portion 50.

[0103] In this example, the refrigerant outlet 62 is located at the other end of the core 30 along its axial direction. Specifically, the refrigerant outlet 62 extends axially through the second core 32. A connecting hole is provided on the second wall portion 42 of the insulating member 40, which connects the refrigerant outlet 62 and the radially outer side of the coil 20 with the radially outer side of the receiving portion 50.

[0104] In this example, the refrigerant outlet 62 is positioned to avoid being visible from the refrigerant inlet 61 when viewed axially. Specifically, the refrigerant outlet 62 is positioned to avoid overlapping with the refrigerant inlet 61 when viewed axially. For example, the refrigerant outlet 62 is arranged at a position offset by more than 90° from the refrigerant inlet 61 with respect to the winding axis Q. Figure 2 In the example, the refrigerant outlet 62 is located 180° off the position of the refrigerant inlet 61 with the winding axis Q as the center.

[0105] In this example, the refrigerant pressure at refrigerant inlet 61 is higher than the refrigerant pressure at refrigerant outlet 62.

[0106] [Refrigerant Flow Path]

[0107] A refrigerant flow path 65 is provided between the coil 20 and the core 30. The refrigerant flow path 65 connects the refrigerant inlet 61 and the refrigerant outlet 62. The refrigerant flow path 65 is configured such that the refrigerant flowing from the refrigerant inlet 61 toward the refrigerant outlet 62 mainly flows along the coil 20 in the winding direction of the coil 20.

[0108] In this example, the refrigerant flow path 65 has a main flow path 66 and a secondary flow path 67.

[0109] The main path 66 extends along the coil 20 in the winding direction of the coil 20. In this example, the main path 66 includes the gap between the radially outer side of the coil 20 and the core 30.

[0110] The secondary flow path 67 extends along the coil 20 in the winding direction of the coil 20. In this example, the secondary flow path 67 includes a gap between the core 30 and a first wall portion 41 of the insulating member 40, which is disposed at a first end 21 of the coil 20.

[0111] It should be noted that the flow path cross-sectional area of ​​the main flow path 66 is larger than that of the secondary flow path 67.

[0112] In this example, refrigerant flow path 65 faces coil 20. Specifically, the main flow path 66 of refrigerant flow path 65 faces coil 20. It should be noted that the secondary flow path 67 of refrigerant flow path 65 does not face coil 20.

[0113] [Refrigerant flow]

[0114] Next, the flow of refrigerant in the thrust magnetic bearing 16 of the embodiment will be described.

[0115] The refrigerant flowing into the refrigerant flow path 65 through the refrigerant inlet 61 mainly flows in the main flow path 66. In the main flow path 66, the refrigerant flows along the coil 20 in the winding direction of the coil 20. In this way, the coil 20 is cooled. Then, the refrigerant in the main flow path 66 flows out through the refrigerant outlet 62.

[0116] A portion of the refrigerant flowing into the refrigerant flow path 65 through the refrigerant inlet 61 flows in the secondary flow path 69. It should be noted that the flow rate of refrigerant flowing in the secondary flow path 67 is less than the flow rate of refrigerant flowing in the main flow path 66. In the secondary flow path 67, the refrigerant flows along the coil 20 in the winding direction of the coil 20. This cools the first wall 41 of the insulating component 40, thereby indirectly cooling the coil 20. The refrigerant in the secondary flow path 67 then flows out through the refrigerant outlet 62 or the through-hole 35.

[0117] [Explanation of the comparative examples]

[0118] Next, refer to Figure 3 A comparative example of the thrust magnetic bearing 16 will be described. It should be noted that, hereinafter, the comparative example of the thrust magnetic bearing 16 will be referred to as "thrust magnetic bearing 9". For ease of explanation, for the components of the thrust magnetic bearing 9 that are the same as the components of the thrust magnetic bearing 16 of the embodiment, the same reference numerals are used as those for the components of the thrust magnetic bearing 16 of the embodiment.

[0119] like Figure 3 As shown, the refrigerant inlet 91 and refrigerant outlet 92 of the thrust magnetic bearing 9 differ from those of the thrust magnetic bearing 16 in the embodiment. In the core 90 of the thrust magnetic bearing 9, the refrigerant outlet 92 is located at a position visible from the refrigerant inlet 91 when viewed axially (specifically, at a position overlapping with the refrigerant inlet 91). It should be noted that the other structures of the thrust magnetic bearing 9 are the same as those of the thrust magnetic bearing 16 in the embodiment.

[0120] In the thrust magnetic bearing 9, since the refrigerant outlet 92 is located at a position visible from the refrigerant inlet 91 when viewed axially, the refrigerant flowing into the gap between the radially outer side of the coil 20 and the iron core 90 through the refrigerant inlet 91 mainly flows in a straight line axially toward the refrigerant outlet 92. Therefore, the refrigerant flowing into the gap between the radially outer side of the coil 20 and the iron core 90 through the refrigerant inlet 91 is difficult to flow along the winding direction of the coil 20.

[0121] [Effects of the Implementation Method]

[0122] In the thrust magnetic bearing 16 of the embodiment, the refrigerant flow path 65 is formed such that the refrigerant flowing from the refrigerant inlet 61 toward the refrigerant outlet 62 flows mainly along the coil 20 in the winding direction of the coil 20. With this structure, the refrigerant can flow mainly along the coil 20 in the winding direction of the coil 20, thereby effectively cooling the coil 20.

[0123] In the thrust magnetic bearing 16 of this embodiment, the refrigerant flow path 65 has a main flow path 66 that extends along the coil 20 in the winding direction of the coil 20. The main flow path 66 allows the refrigerant to flow primarily along the coil 20 in the winding direction of the coil 20. This effectively cools the coil 20.

[0124] In the thrust magnetic bearing 16 of this embodiment, the main flow path 66 includes the gap between the radially outer side of the coil 20 and the iron core 30. With this structure, the refrigerant can flow primarily within the gap between the radially outer side of the coil 20 and the iron core 30. It should be noted that the gap between the radially outer side of the coil 20 and the iron core 30 extends along the coil 20 in the winding direction of the coil 20. Therefore, since the refrigerant can flow primarily along the coil 20 in the winding direction of the coil 20, the coil 20 can be effectively cooled.

[0125] In the thrust magnetic bearing 16 of this embodiment, the refrigerant flow path 65 has a main flow path 66 and a secondary flow path 67, the secondary flow path 67 including the gap between the core 30 and the first wall portion 41 of the insulating member 40. The flow rate of refrigerant in the main flow path 66 is greater than the flow rate of refrigerant in the secondary flow path 67. Therefore, since the refrigerant can flow mainly along the winding direction of the coil 20, the coil 20 can be effectively cooled. By allowing the refrigerant to flow in the secondary flow path 67, the coil 20 can be indirectly cooled.

[0126] In the thrust magnetic bearing 16 of this embodiment, the flow path cross-sectional area of ​​the main flow path 66 is larger than that of the secondary flow path 67. By making the flow path cross-sectional area of ​​the main flow path 66 larger than that of the secondary flow path 67, the flow rate of refrigerant in the main flow path 66 can be greater than that in the secondary flow path 67. As a result, the refrigerant can flow mainly along the winding direction of the coil 20, thus effectively cooling the coil 20.

[0127] In the thrust magnetic bearing 16 of this embodiment, the refrigerant outlet 62 is positioned to avoid being visible from the refrigerant inlet 61 when viewed axially. This structure prevents the refrigerant from flowing linearly from the refrigerant inlet 61 towards the refrigerant outlet 62 along the axial direction. Consequently, the refrigerant flows easily along the winding direction of the coil 20, thus effectively cooling the coil 20.

[0128] In the thrust magnetic bearing 16 of this embodiment, the refrigerant flow path 65 faces the coil 20. With this structure, the coil 20 can be cooled more effectively compared to the case where the refrigerant flow path 65 does not face the coil 20.

[0129] In the thrust magnetic bearing 16 of this embodiment, the refrigerant pressure at the refrigerant inlet 61 is higher than the refrigerant pressure at the refrigerant outlet 62. Utilizing the pressure difference between the refrigerant inlet 61 and the refrigerant outlet 62, the refrigerant can flow in the refrigerant flow path 65.

[0130] (Modification 1 of the implementation method)

[0131] Figure 4 The structure of the thrust magnetic bearing 16 in Modified Example 1 of the Embodiment is illustrated. The refrigerant outlet 62 of the thrust magnetic bearing 16 in Modified Example 1 of the Embodiment is... Figure 2 The thrust magnetic bearing 16 of the illustrated embodiment differs from that of the embodiment shown. The other structural features of the thrust magnetic bearing 16 in Modification 1 of Embodiment 1 are the same as those of the thrust magnetic bearing 16 in the illustrated embodiment.

[0132] In Modification 1, the refrigerant outlet 62 is located at one end of the core 30 along its axial direction. Specifically, the refrigerant outlet 62 extends axially through the first core 31. A connecting hole is provided on the first wall portion 41 of the insulating member 40, which connects the gap between the refrigerant outlet 62 and the radially outer side of the coil 20 and the radially outer side of the receiving portion 50.

[0133] [Effects of Variation 1 of the Implementation Method]

[0134] In the thrust magnetic bearing 16 of the modified embodiment 1, the same effects as those of the thrust magnetic bearing 16 of the embodiment can be obtained. For example, since the refrigerant can flow mainly along the coil 20 in the winding direction of the coil 20, the coil 20 can be cooled effectively.

[0135] (Modification 2 of the implementation method)

[0136] Figure 5 The structure of the thrust magnetic bearing 16 in Modified Example 2 of the Embodiment is illustrated. The refrigerant inlet 61 of the thrust magnetic bearing 16 in Modified Example 2 of the Embodiment is... Figure 2 The thrust magnetic bearing 16 of the illustrated embodiment differs from that of the embodiment. The other structural features of the thrust magnetic bearing 16 in variant 2 of the embodiment are the same as those of the thrust magnetic bearing 16 in the illustrated embodiment.

[0137] In Modification 2, the refrigerant inlet 61 is located radially outside the core 30. Specifically, the refrigerant inlet 61 penetrates the first core 31 radially and communicates with the gap between the radially outer side of the coil 20 and the core 30.

[0138] [Effects of Variation 2 of the Implementation Method]

[0139] In the thrust magnetic bearing 16 of the modified embodiment 2, the same effects as those of the thrust magnetic bearing 16 of the embodiment can be obtained. For example, since the refrigerant can flow mainly along the coil 20 in the winding direction of the coil 20, the coil 20 can be cooled effectively.

[0140] (Modification 3 of the implementation method)

[0141] Figure 6 The structure of the thrust magnetic bearing 16 in Modified Example 3 of the Embodiment is illustrated. The refrigerant outlet 62 of the thrust magnetic bearing 16 in Modified Example 3 of the Embodiment is... Figure 5 The thrust magnetic bearing 16 in Modification 2 of the embodiment shown is different. The other structures of the thrust magnetic bearing 16 in Modification 3 of the embodiment are the same as those in Modification 2 of the embodiment.

[0142] In Modification 3, the refrigerant outlet 62 is located on the radially outer side of the core 30. Specifically, the refrigerant outlet 62 penetrates the first core 31 radially and communicates with the gap between the radially outer side of the coil 20 and the core 30.

[0143] [Effects of Variation 3 of the Implementation Method]

[0144] In the thrust magnetic bearing 16 of the modified embodiment 3, the same effects as those of the thrust magnetic bearing 16 of the embodiment can be obtained. For example, since the refrigerant can flow mainly along the coil 20 in the winding direction of the coil 20, the coil 20 can be cooled effectively.

[0145] (Modification 4 of the implementation method)

[0146] Figure 7 The structure of the thrust magnetic bearing 16 in Modification 4 of Embodiment 4 is illustrated. Besides... Figure 2 In addition to the structure of the thrust magnetic bearing 16 in the illustrated embodiment, a blocking member 70 is also included.

[0147] The blocking component 70 blocks the flow of refrigerant in the gap between the core 30 and the first wall portion 41 of the insulating component 40, which is arranged at the first end 21 of the coil 20.

[0148] In this example, the blocking member 70 is an elastic member. The blocking member 70 is disposed between the second wall portion 42 of the insulating member 40 and the second end portion 52 of the receiving portion 50. The blocking member 70 presses the insulating member 40 against the first end portion 51 of the receiving portion 50. In this way, the gap between the first end portion 51 of the receiving portion 50 and the first wall portion 41 of the insulating member 40 is eliminated.

[0149] [Effects of Variation 4 of the Implementation Method]

[0150] In the thrust magnetic bearing 16 of the modified embodiment 4, the same effects as those of the thrust magnetic bearing 16 of the embodiment can be obtained. For example, since the refrigerant can flow mainly along the coil 20 in the winding direction of the coil 20, the coil 20 can be cooled effectively.

[0151] The thrust magnetic bearing 16 in variation 4 of the embodiment includes a blocking member 70 that blocks the flow of refrigerant in the gap between the core 30 and the first wall 41 of the insulating member 40. By blocking the flow of refrigerant in the gap between the core 30 and the first wall 41 of the insulating member 40, the refrigerant can easily flow to the main flow path 66. In this way, the refrigerant can easily flow mainly along the coil 20 in the winding direction of the coil 20, thereby easily and effectively cooling the coil 20.

[0152] It should be noted that the blocking member 70 can also be a sealing member that seals the gap between the core 30 and the first wall portion 41 of the insulating member 40. In this case, by providing the blocking member 70 between the first end portion 51 of the receiving portion 50 and the first wall portion 41 of the insulating member 40, the gap between the first end portion 51 of the receiving portion 50 and the first wall portion 41 of the insulating member 40 is eliminated. With such a configuration, it is also possible to prevent the flow of refrigerant in the gap between the core 30 and the first wall portion 41 of the insulating member 40.

[0153] (Modification 5 of the implementation method)

[0154] Figure 8 The structure of the thrust magnetic bearing 16 in Modified Example 5 of the Embodiment is illustrated. Modified Example 5 of the Embodiment's thrust magnetic bearing 16, except... Figure 2 In addition to the structure of the thrust magnetic bearing 16 shown in the embodiment, it also includes a partition 80.

[0155] like Figure 8 As shown, a partition 80 is disposed in the gap between the radially outer side of the coil 20 and the iron core 30. In this example, the partition 80 divides the gap between the radially outer side of the coil 20 and the iron core 30 along the axial direction. A notch 80a is provided on the partition 80. The notch 80a allows the refrigerant to pass through axially.

[0156] like Figure 9 As shown, the partition 80 is formed in a ring shape. Figure 8 As shown, the partition 80 extends from the radially outer side of the coil 20 (the outer peripheral surface in this example) to the radially outer side of the receiving portion 50 (the outer peripheral surface in this example). The partition 80 divides the gap between the radially outer side of the coil 20 and the radially outer side of the receiving portion 50 along the axial direction of the entire circumference in the winding direction.

[0157] In Modification 5, the main flow path 66 includes the portion sandwiched between the partition 80 and the first end 51 of the receiving portion 50 in the gap between the radially outer side of the coil 20 and the core 30. It should be noted that the structure of the secondary flow path 67 in Modification 5 is similar to... Figure 2 The secondary flow path 67 in the illustrated embodiment has the same structure.

[0158] In Modification 5, at least one of the refrigerant inlet 61 and refrigerant outlet 62 is positioned to avoid overlapping with the notch 80a when viewed axially. In this example, the refrigerant outlet 62 is positioned to overlap with the notch 80a when viewed axially. The refrigerant inlet 61 is positioned to avoid overlapping with the notch 80a when viewed axially. For example, the refrigerant inlet 61 is arranged at a position offset by more than 90° from the refrigerant outlet 62 with respect to the winding axis Q. Figure 8In the example, the refrigerant inlet 61 is positioned 180° off from the refrigerant outlet 62 with the winding axis Q as the center.

[0159] [Refrigerant flow]

[0160] Next, the flow of refrigerant in the thrust magnetic bearing 16 of the modified embodiment 5 will be described.

[0161] The refrigerant flowing into the refrigerant flow path 65 through the refrigerant inlet 61 mainly flows in the main flow path 66. In the main flow path 66, the refrigerant flows along the coil 20 in the winding direction of the coil 20. In this way, the coil 20 is cooled. Then, the refrigerant in the main flow path 66 flows out through the notch 80a of the partition 80 and the refrigerant outlet 62.

[0162] A portion of the refrigerant flowing into the refrigerant flow path 65 through the refrigerant inlet 61 flows in the secondary flow path 69. It should be noted that the flow rate of refrigerant flowing in the secondary flow path 67 is less than the flow rate of refrigerant flowing in the main flow path 66. In the secondary flow path 67, the refrigerant flows along the coil 20 in the winding direction of the coil 20. This cools the first wall 41 of the insulating component 40, thereby indirectly cooling the coil 20. The refrigerant in the secondary flow path 67 then flows out through the notch 80a of the partition 80 and the refrigerant outlet 62.

[0163] [Effects of Variation 5 of the Implementation Method]

[0164] In the thrust magnetic bearing 16 of the modified embodiment 5, the same effects as those of the thrust magnetic bearing 16 of the embodiment can be obtained. For example, since the refrigerant can flow mainly along the coil 20 in the winding direction of the coil 20, the coil 20 can be cooled effectively.

[0165] The thrust magnetic bearing 16 in variation 5 of the embodiment includes a partition 80 disposed in the gap between the radially outer side of the coil 20 and the iron core 30. With this structure, the flow of refrigerant in the gap between the radially outer side of the coil 20 and the iron core 30 can be regulated.

[0166] In the thrust magnetic bearing 16 of the modified embodiment 5, a partition 80 divides the gap between the radially outer side of the coil 20 and the core 30 along the axial direction. A notch 80a is provided on the partition 80 to allow refrigerant to pass through axially. At least one of the refrigerant inlet 61 and the refrigerant outlet 62 is positioned to avoid overlapping with the notch 80a when viewed axially. This structure prevents refrigerant from flowing linearly from the refrigerant inlet 61 towards the refrigerant outlet 62 along the axial direction. As a result, the refrigerant can easily flow along the coil 20 in the winding direction of the coil 20, thus effectively cooling the coil 20.

[0167] (Modification 6 of the implementation method)

[0168] Figure 10 The structure of the thrust magnetic bearing 16 in Modification 6 of Embodiment 1 is illustrated. The refrigerant outlet 62 of the thrust magnetic bearing 16 in Modification 6 of Embodiment 1 is... Figure 8 The thrust magnetic bearing 16 of the embodiment shown in Modification 5 is different. The other structures of the thrust magnetic bearing 16 of Modification 6 are the same as those of the thrust magnetic bearing 16 of Modification 5.

[0169] In variation 6, the refrigerant inlet 61 and refrigerant outlet 62 are positioned to avoid overlapping with the notch 80a when viewed axially. For example, the refrigerant inlet 61 and refrigerant outlet 62 are arranged at a position offset by more than 90° from the notch 80a of the partition 80 with the winding axis Q as the center. Figure 10 In the example, the refrigerant inlet 61 and the refrigerant outlet 62 are arranged at a position 180° off from the position of the notch 80a of the partition 80, with the winding axis Q as the center.

[0170] In Modification 6, the refrigerant outlet 62 is positioned to overlap with the refrigerant inlet 61 when viewed axially. It should be noted that a partition 80 is arranged between the refrigerant inlet 61 and the refrigerant outlet 62. With this structure, although the refrigerant outlet 62 is positioned to overlap with the refrigerant inlet 61 when viewed axially, the presence of the partition 80 prevents the refrigerant outlet 62 from being visible from the refrigerant inlet 61, thus preventing the refrigerant from flowing linearly from the refrigerant inlet 61 towards the refrigerant outlet 62 axially.

[0171] In Modification 6, the partition 80 divides the gap between the radially outer side of the coil 20 and the core 30 along the axial direction, thereby dividing the gap between the radially outer side of the coil 20 and the core 30 into multiple flow paths. These multiple flow paths extend along the coil 20 in the winding direction and are interconnected through the notch 80a of the partition 80. The main flow path 66 contains multiple flow paths.

[0172] [Refrigerant flow]

[0173] Next, the flow of refrigerant in the thrust magnetic bearing 16 of the modified embodiment 6 will be described.

[0174] The refrigerant flowing into the refrigerant flow path 65 through the refrigerant inlet 61 mainly flows in the main flow path 66. In the main flow path 66, the refrigerant flows from the refrigerant inlet 61 along the winding direction of the coil 20 towards the notch 80a of the partition 80, and passes axially through the notch 80a of the partition 80. This cools the coil 20. The refrigerant that has passed through the notch 80a of the partition 80 flows from the notch 80a of the partition 80 along the winding direction of the coil 20 towards the refrigerant outlet 62. This cools the coil 20. Then, the refrigerant in the main flow path 66 flows out through the refrigerant outlet 62.

[0175] [Effects of Variation 6 of the Implementation Method]

[0176] In the thrust magnetic bearing 16 of the modified embodiment 6, the same effects as those of the thrust magnetic bearing 16 of the modified embodiment 5 can be obtained. For example, since the refrigerant can flow mainly along the coil 20 in the winding direction of the coil 20, the coil 20 can be cooled effectively.

[0177] In the thrust magnetic bearing 16 of the modified embodiment 6, the partition 80 divides the gap between the radially outer side of the coil 20 and the iron core 30 into multiple flow paths. With this structure, it is possible to suppress the deflection of refrigerant in the gap between the radially outer side of the coil 20 and the iron core 30.

[0178] (Modification 7 of the implementation method)

[0179] Figure 11 The structure of the thrust magnetic bearing 16 in Embodiment Modification 7 is illustrated. The refrigerant inlet 61 and refrigerant flow path 65 of the thrust magnetic bearing 16 in Embodiment Modification 7 are... Figure 2 The thrust magnetic bearing 16 of the illustrated embodiment differs. The other structures of the thrust magnetic bearing 16 in variant 7 of the embodiment are the same as those of the thrust magnetic bearing 16 in the illustrated embodiment.

[0180] like Figure 11As shown, refrigerant flows inside a shaft 14 supported in a non-contact manner by a thrust magnetic bearing 16 of embodiment 7. This shaft 14 can release the refrigerant radially by rotation. Specifically, a first flow path 14b extending in the extending direction of the shaft 14 and a second flow path 14c extending in a direction orthogonal to the extending direction of the shaft 14 are provided on the shaft 14. Refrigerant flows in the first flow path 14b and the second flow path 14c. When the shaft 14 rotates, due to the centrifugal pump effect, the refrigerant is released radially from the first flow path 14b through the second flow path 14c.

[0181] In variation 7, the refrigerant inlet 61 opens on the inner circumferential surface of the through hole 35. In this example, the radial end of the gap between the core 30 and the first wall portion 41 of the insulating member 40 constitutes the refrigerant inlet 61. Figure 12 As shown, the refrigerant inlet 61 is formed to cover the entire circumference of the winding direction of the coil 20.

[0182] In Modification 7, the refrigerant flow path 65 has a main flow path 66 and a connecting flow path 68. It should be noted that the structure of the main flow path 66 in Modification 7 is similar to... Figure 2 The structure of the main path 66 in the illustrated embodiment is the same.

[0183] like Figure 11 As shown, the connecting flow path 68 includes a gap between the core 30 and a first wall portion 41 of the insulating component 40, the first wall portion 41 of which is disposed at a first end 21 of the coil 20. The connecting flow path 68 connects the refrigerant inlet 61 to the main flow path 66. Figure 12 As shown, the connecting flow path 68 is formed to cover the entire circumference of the winding direction of the coil 20.

[0184] [Refrigerant flow]

[0185] Next, the flow of refrigerant in the thrust magnetic bearing 16 of the modified embodiment 7 will be described.

[0186] Refrigerant released from shaft 14 flows into connecting flow path 68 through refrigerant inlet 61. In connecting flow path 68, the refrigerant flows radially outward into main flow path 66. In main flow path 66, the refrigerant flows along coil 20 in the winding direction of coil 20. This cools coil 20. The refrigerant in main flow path 66 flows out through refrigerant outlet 62.

[0187] [Effects of Variation 7 of the Implementation Method]

[0188] In the thrust magnetic bearing 16 of the modified embodiment 7, the same effects as those of the thrust magnetic bearing 16 of the embodiment can be obtained. For example, since the refrigerant can flow mainly along the coil 20 in the winding direction of the coil 20, the coil 20 can be cooled effectively.

[0189] In the thrust magnetic bearing 16 of the modified embodiment 7, a shaft 14 is inserted through the through hole 35, and refrigerant flows inside the shaft 14. The shaft 14 can release the refrigerant radially by rotation. A refrigerant inlet 61 opens on the inner circumferential surface of the through hole 35. With this structure, the refrigerant released from the shaft 14 flows into the refrigerant flow path 65 through the refrigerant inlet 61 opening on the inner circumferential surface of the through hole 35. In this way, the coil 20 can be effectively cooled using the refrigerant released from the shaft 14.

[0190] In the thrust magnetic bearing 16 of the modified embodiment 7, the refrigerant flow path 65 has a main flow path 66 and a connecting flow path 68. The connecting flow path 68 includes the gap between the core 30 and the first wall portion 41 of the insulating member 40, and connects the refrigerant inlet 61 to the main flow path 66. With this structure, refrigerant can flow from the refrigerant inlet 61 to the main flow path 66 through the gap between the core 30 and the first wall portion 41 of the insulating member 40.

[0191] (Variation 8 of the implementation method)

[0192] Figure 13 The structure of the thrust magnetic bearing 16 in Modified Example 8 of Embodiment 1 is illustrated. Modified Example 8 of Embodiment 8, in addition to... Figure 11 In addition to the structure of the thrust magnetic bearing 16 in Modification 7 of the embodiment shown, it also includes a blocking member 70. In Modification 8 of the embodiment, the insulating member 40 of the thrust magnetic bearing 16 and... Figure 11 The thrust magnetic bearing 16 of the embodiment shown in Modification 7 is different. The other structures of the thrust magnetic bearing 16 of Modification 8 are the same as those of the thrust magnetic bearing 16 of Modification 7.

[0193] In Modification 8, the blocking member 70 blocks the flow of refrigerant in the gap between the core 30 and the first wall portion 41 of the insulating member 40. In this example, the blocking member 70 is an elastic member. The blocking member 70 is disposed between the second wall portion 42 of the insulating member 40 and the second end portion 52 of the receiving portion 50. The blocking member 70 presses the insulating member 40 against the first end portion 51 of the receiving portion 50. In this way, the gap between the first end portion 51 of the receiving portion 50 and the first wall portion 41 of the insulating member 40 is eliminated.

[0194] In Modification 8, a radially extending groove 41g is provided on the surface of the first wall portion 41 of the insulating member 40 opposite to the core 30, the first wall portion 41 of the insulating member 40 being arranged at the first end portion 21 of the coil 20. Figure 14 As shown, in this example, multiple slots 41g are provided.

[0195] In Modification 8, the refrigerant flow path 65 has a main flow path 66 and a connecting flow path 68. It should be noted that the structure of the main flow path 66 in Modification 8 is similar to... Figure 2 The structure of the main path 66 in the illustrated embodiment is the same.

[0196] like Figure 13 and Figure 14 As shown, the connecting flow path 68 includes a groove 41g in the first wall portion 41 of the insulating member 40. The connecting flow path 68 connects the refrigerant inlet 61 to the main flow path 66.

[0197] [Effects of Variation 8 of the Implementation Method]

[0198] In the thrust magnetic bearing 16 of the modified embodiment 8, the same effects as those of the thrust magnetic bearing 16 of the modified embodiment 7 can be obtained. For example, since the refrigerant can flow mainly along the coil 20 in the winding direction of the coil 20, the coil 20 can be cooled effectively.

[0199] In the thrust magnetic bearing 16 of the modified embodiment 8, the refrigerant flow path 65 has a main flow path 66 and a connecting flow path 68. The connecting flow path 68 includes a groove 41g in the first wall portion 41 of the insulating member 40 and connects the refrigerant inlet 61 to the main flow path 66. With this structure, refrigerant can flow from the refrigerant inlet 61 to the main flow path 66 through the groove 41g in the first wall portion 41 of the insulating member 40.

[0200] (Modification 9 of the implementation method)

[0201] Figure 15 The structure of the thrust magnetic bearing 16 in Modification 9 of Embodiment 1 is illustrated. Modification 9 of Embodiment 9, in addition to... Figure 2 In addition to the structure of the thrust magnetic bearing 16 in the illustrated embodiment, it also includes a first partition 81 and a second partition 82.

[0202] like Figure 15As shown, the first partition 81 and the second partition 82 are disposed in the gap between the radially outer side of the coil 20 and the iron core 30. In this example, the first partition 81 and the second partition 82 divide the gap between the radially outer side of the coil 20 and the iron core 30 along the winding direction, thereby dividing the gap between the radially outer side of the coil 20 and the iron core 30 into multiple flow paths 66a. The multiple flow paths 66a extend along the coil 20 in the winding direction of the coil 20. The main flow path 66 includes multiple flow paths 66a.

[0203] Specifically, the first partition 81 is rectangular. The first partition 81 extends from the radially outer side (in this example, the outer peripheral surface) of the coil 20 to the radially outer side (in this example, the outer peripheral surface) of the receiving portion 50. The first partition 81 divides the gap between the radially outer side of the coil 20 and the radially outer side of the receiving portion 50 along the winding direction over the entire axial region. The structure of the second partition 82 is the same as that of the first partition 81. The second partition 82 is positioned 180° off the position of the first partition 81, centered on the winding axis Q. According to this structure, the gap between the radially outer side of the coil 20 and the radially outer side of the receiving portion 50 is divided into two flow paths 66a.

[0204] In Modification 15, a plurality of refrigerant inlets 61 are provided near the first partition 81, and a plurality of refrigerant outlets 62 are provided near the second partition 82. Specifically, two refrigerant inlets 61 corresponding to the two flow paths 66a and two refrigerant outlets 62 corresponding to the two flow paths 66a are provided.

[0205] [Refrigerant flow]

[0206] Next, the flow of refrigerant in the thrust magnetic bearing 16 of the modified embodiment 9 will be described. Hereinafter, one of the two flow paths 66a will be referred to as "first flow path 66a", and the other of the two flow paths 66a will be referred to as "second flow path 66a". The refrigerant inlet 61 and refrigerant outlet 62 corresponding to the first flow path 66a will be referred to as "first refrigerant inlet 61" and "first refrigerant outlet 62", and the refrigerant inlet 61 and refrigerant outlet 62 corresponding to the second flow path 66a will be referred to as "second refrigerant inlet 61" and "second refrigerant outlet 62".

[0207] The refrigerant flowing into the first flow path 66a through the first refrigerant inlet 61 is in the winding direction of the coil 20 (e.g., Figure 15 The refrigerant flows clockwise along coil 20. This cools half of coil 20. Then, the refrigerant in the first flow path 66a flows out through the first refrigerant outlet 62.

[0208] The refrigerant flowing into the second flow path 66a through the second refrigerant inlet 61 is in the winding direction of the coil 20 (e.g., Figure 15 The refrigerant flows counterclockwise along coil 20. This cools the remaining half of coil 20. Then, the refrigerant in the second flow path 66a flows out through the second refrigerant outlet 62.

[0209] [Effects of Variation 9 of the Implementation Method]

[0210] In the thrust magnetic bearing 16 of the modified embodiment 9, the same effects as those of the thrust magnetic bearing 16 of the embodiment can be obtained. For example, since the refrigerant can flow mainly along the coil 20 in the winding direction of the coil 20, the coil 20 can be cooled effectively.

[0211] The thrust magnetic bearing 16 in variation 9 of the embodiment includes a first partition 81 and a second partition 82 disposed in the gap between the radially outer side of the coil 20 and the iron core 30. With this structure, the flow of refrigerant in the gap between the radially outer side of the coil 20 and the iron core 30 can be regulated.

[0212] In the thrust magnetic bearing 16 of the modified embodiment 9, the first partition 81 and the second partition 82 divide the gap between the radially outer side of the coil 20 and the iron core 30 into multiple flow paths 66a. With this structure, it is possible to suppress the deflection of refrigerant in the gap between the radially outer side of the coil 20 and the iron core 30.

[0213] In the thrust magnetic bearing 16 of the modified embodiment 9, the first partition 81 and the second partition 82 divide the gap between the radially outer side of the coil 20 and the iron core 30 along the winding direction. With this structure, it is possible to suppress the deflection of refrigerant along the winding direction in the gap between the radially outer side of the coil 20 and the iron core 30.

[0214] (Other implementation methods)

[0215] In the above description, coil 20 can be exposed or covered by potting resin or the like.

[0216] In the above description, the coil 20 housed in the iron core 30 may or may not be completely surrounded by the iron core 30.

[0217] In the above description, the case in which the iron core 30 is constructed by arranging the first iron core 31 and the second iron core 32, which are formed in a ring shape, along the axial direction has been used as an example, but it is not limited to this. For example, the iron core 30 can also be constructed by a combination of iron cores of other shapes such as U-shaped iron cores and L-shaped iron cores.

[0218] The above description uses the example of refrigerant flowing in refrigerant flow path 65 using the refrigerant pressure difference between refrigerant inlet 61 and refrigerant outlet 62, but it is not limited to this. For example, the refrigerant can also flow in refrigerant flow path 65 using the height difference between refrigerant inlet 61 and refrigerant outlet 62.

[0219] The refrigerant can be in the state of gas, liquid, or a two-phase gas-liquid state.

[0220] The above explanation uses the case where two flow paths are formed by partitions 80, 81, and 82 as an example, but it is not limited to this. Three or more flow paths can also be formed by partitions 80, 81, and 82.

[0221] The embodiments and modifications have been described; however, it should be understood that various changes can be made to the embodiments and technical solutions without departing from the spirit and scope of the claims. The above embodiments and modifications can also be appropriately combined or substituted as long as the function of the object of this disclosure is not affected.

[0222] -Industry Applicability-

[0223] In summary, this disclosure is useful as a thrust magnetic bearing.

[0224] - Symbol Explanation -

[0225] 10-turbo compressor

[0226] 11 Casing

[0227] 12 impellers

[0228] 13 electric motors

[0229] 14-axis

[0230] 15 bottom contact bearing

[0231] 16 thrust magnetic bearing

[0232] 16a stator

[0233] 16b rotor

[0234] 17 Radial magnetic bearing

[0235] 18 Control Department

[0236] 19 Power Supply Section

[0237] 20 coils

[0238] 21 First end

[0239] 22 Second end

[0240] 30 Iron Heart

[0241] 31 First Iron Heart

[0242] 32 Second Iron Heart

[0243] 40 Insulating Components

[0244] 41 First wall section

[0245] 42 Second wall section

[0246] 43 Connecting parts

[0247] 41g slot

[0248] 50 Storage Department

[0249] 51 First end

[0250] 52 Second end

[0251] 61 Refrigerant Inlet

[0252] 62 Refrigerant Export

[0253] 65 Refrigerant Flow Path

[0254] 66 Main Road

[0255] 67 sub-flow paths

[0256] 68 connection flow paths

[0257] 70 blocking components

[0258] 80 partition

[0259] 81 First partition

[0260] 82 Second partition

[0261] 9. Thrust magnetic bearing (comparative example)

[0262] 90% iron core (comparative example)

[0263] 91 Refrigerant Inlet (Comparative Example)

[0264] 92 Refrigerant outlet (comparative example)

Claims

1. A thrust magnetic bearing characterized by: The thrust magnetic bearing includes a coil (20), a core (30), and an insulating member (40), The coil (20) is configured by winding a wire, The core (30) houses the coil (20), The insulating member (40) insulates the coil (20) from the core (30), A refrigerant inlet (61) and a refrigerant outlet (62) are provided on the core (30), A refrigerant flow path (65) is provided between the coil (20) and the core (30), and connects the refrigerant inlet (61) and the refrigerant outlet (62), The refrigerant flow path (65) is formed so that refrigerant flowing from the refrigerant inlet (61) toward the refrigerant outlet (62) mainly flows along the coil (20) in a winding direction of the coil (20), The refrigerant flow path (65) has a main flow path (66) extending along the coil (20) in the winding direction of the coil (20), The insulating member (40) is arranged on both axial sides and radially inner sides of the coil (20), The main flow path (66) includes a gap between a radially outer side of the coil (20) and the core (30).

2. The thrust magnetic bearing according to claim 1, wherein: The thrust magnetic bearing includes a blocking member (70) that blocks flow of the refrigerant in a gap between the core (30) and a wall portion (41) of the insulating member (40) arranged at an end portion (21) in the axial direction of the coil (20).

3. The thrust magnetic bearing according to claim 1, wherein: The refrigerant flow path (65) has the main flow path (66) and a sub flow path (67) that includes a gap between the core (30) and a wall portion (41) of the insulating member (40) arranged at an end portion (21) in the axial direction of the coil (20).

4. The thrust magnetic bearing according to claim 3, wherein: A cross-sectional area of the flow path of the main flow path (66) is larger than that of the sub flow path (67).

5. The thrust magnetic bearing according to claim 1, wherein: A through hole (35) is provided in the core (30) at a position radially inward of the coil (20), the through hole (35) penetrating the core (30) in the axial direction, A shaft (14) is inserted through the through hole (35), the refrigerant flowing inside the shaft (14), the shaft (14) being able to release the refrigerant radially by rotation, The refrigerant inlet (61) is opened at an inner peripheral surface of the through hole (35).

6. The thrust magnetic bearing according to claim 5, wherein: The refrigerant flow path (65) has the main flow path (66) and a connection flow path (68) that includes a gap between the core (30) and a wall portion (41) of the insulating member (40) arranged at the axial end portion (21) of the coil (20), the connection flow path (68) connecting the refrigerant inlet (61) and the main flow path (66).

7. The thrust magnetic bearing according to claim 5, wherein: A groove (41g) extending in the radial direction is provided on a surface of the wall portion (41) of the insulating member (40) opposite the core (30) arranged at the axial end portion (21) of the coil (20), The refrigerant flow path (65) has the main flow path (66) and a connection flow path (68) that includes a groove (41g) of the wall portion (41) of the insulating member (40), the connection flow path (68) connecting the refrigerant inlet (61) and the main flow path (66).

8. The thrust magnetic bearing according to any one of claims 1 to 7, wherein: The thrust magnetic bearing includes a partition plate (80, 81, 82) provided in a gap between the radial outer side of the coil (20) and the core (30).

9. The thrust magnetic bearing according to claim 8, wherein: The partition plate (80, 81, 82) divides the gap between the radial outer side of the coil (20) and the core (30) into a plurality of flow paths.

10. The thrust magnetic bearing according to claim 8, wherein: The partition plate (81, 82) divides the gap between the radial outer side of the coil (20) and the core (30) in the winding direction.

11. The thrust magnetic bearing according to claim 8, wherein: The partition plate (80) divides the gap between the radial outer side of the coil (20) and the core (30) in the axial direction, A notch (80a) is provided in the partition plate (80) through which the refrigerant passes in the axial direction, At least one of the refrigerant inlet (61) and the refrigerant outlet (62) is provided at a position that avoids overlapping with the notch (80a) when viewed in the axial direction.

12. The thrust magnetic bearing according to any one of claims 1 to 7, wherein: The refrigerant outlet (62) is provided at a position that avoids being visible from the refrigerant inlet (61) when viewed in the axial direction of the coil (20).

13. The thrust magnetic bearing according to any one of claims 1 to 7, wherein: The refrigerant flow path (65) faces the coil (20).

14. The thrust magnetic bearing according to any one of claims 1 to 7, wherein: The refrigerant pressure at the refrigerant inlet (61) is higher than the refrigerant pressure at the refrigerant outlet (62). The refrigerant pressure at the refrigerant inlet (61) is higher than the refrigerant pressure at the refrigerant outlet (62).

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