Stationary induction electric appliance and stationary induction electric appliance assembly

Abstract

To provide a stationary induction electric appliance and a stationary induction electric appliance assembly that can improve cooling performance and achieve miniaturization.SOLUTION: A stationary induction electric appliance has a winding, an inner cylinder, an outer cylinder, inner flow control plates, and outer flow control plates. The inner cylinder is arranged to be spaced from the winding at a first interval. The outer cylinder is arranged to be spaced from the winding at a second interval. The inner flow control plates and the outer flow control plates are arranged alternately through intervals therebetween in an axial direction. The inner flow control plates have an interval of the second interval or more from the outer cylinder. The inner flow control plates have a third interval less than the first interval from the inner cylinder. The outer flow control plates have an interval of the first interval or more from the inner cylinder. The outer flow control plates have a fourth interval of less than the second interval from the outer cylinder. When the first interval is larger than the second interval, the third interval is larger than the fourth interval. When the second interval is larger than the first interval, the fourth interval is larger than the third interval.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] SUMMARY OF THE DISCLOSURE Embodiments of the present invention relate to stationary inductors and stationary inductor assemblies. [Background technology]

[0002] The windings of a static induction motor generate heat when electricity is passed through them. To cool the windings, a coolant is circulated through the static induction motor. There is a demand for static induction motors that have improved cooling performance and are compact. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-033940 A [Patent Document 2] Japanese Patent Application Publication No. 9-162040 [Patent Document 3] Japanese Patent Application Publication No. 6-275444 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a stationary induction motor and a stationary induction motor assembly that can improve cooling performance and achieve a compact size. [Means for solving the problem]

[0005] The stationary induction machine of the embodiment has a winding, an inner cylinder, an outer cylinder, an inner flow control plate, and an outer flow control plate. The winding is wound in a circular disk shape. The inner cylinder is disposed inside the winding with a first interval between the inner cylinder and the winding in a radial direction of the winding. The outer cylinder is disposed outside the winding with a second interval between the inner cylinder and the winding in a radial direction. The inner flow control plate is disposed between adjacent windings in an axial direction of the winding. The inner flow control plate has a second interval or more between the inner cylinder and the outer cylinder in a radial direction. The inner flow control plate has a third interval less than the first interval between the inner cylinder and the inner cylinder in a radial direction. The outer flow control plate is disposed between adjacent windings in an axial direction. The outer flow control plate has a first interval or more between the inner cylinder and the outer cylinder in a radial direction. The outer flow control plate has a fourth interval less than the second interval between the outer cylinder and the outer cylinder in a radial direction. The inner flow control plate and the outer flow control plate are alternately disposed with an interval in the axial direction. If the first interval is greater than the second interval, the third interval is greater than the fourth interval. If the second interval is greater than the first interval, the fourth interval is greater than the third interval. [Brief description of the drawings]

[0006] [Figure 1] FIG. 2 is a plan sectional view of the stationary induction motor according to the first embodiment. [Diagram 2] Side cross-sectional view of a stationary induction motor. [Diagram 3] An enlarged side cross-section of a static induction motor. [Figure 4] FIG. 11 is a schematic configuration diagram of a stationary induction electric machine assembly according to a second embodiment. [Diagram 5] FIG. 13 is a schematic configuration diagram of a stationary induction electric machine assembly according to a modified example of the second embodiment. [Figure 6] FIG. 1 is a schematic diagram of a static induction motor assembly according to the prior art. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] Hereinafter, a static induction motor and a static induction motor assembly according to an embodiment will be described with reference to the drawings. (First embodiment) Fig. 1 is a plan sectional view of the stationary induction electric device 1 taken along line II in Fig. 2. Fig. 2 is a side sectional view of the stationary induction electric device taken along line II-II in Fig. 1.

[0008] In this application, the Z direction, R direction, and θ direction of the cylindrical coordinate system are defined as follows. The Z direction is the axial direction of the winding 3 (or iron core). For example, the Z direction is the vertical direction, with the +Z side being the upper side and the -Z side being the lower side. In the Z direction, the direction approaching the center of the stationary induction motor 1 may be called the inner side, and the direction moving away from the center may be called the outer side. The R direction is the radial direction of the winding 3 (or iron core). The +R side is the outer side in the radial direction, and the -R side is the inner side in the radial direction. The θ direction is the circumferential direction of the winding 3 (or iron core). For example, the R direction and the θ direction are horizontal directions.

[0009] The static induction device 1 is, for example, a transformer, a reactor, etc. The static induction device 1 has a winding 3, an inner cylinder (inner insulating cylinder) 4, and an outer cylinder (outer insulating cylinder) 5. The winding 3 is formed by winding a wire material. The wire material is composed of a linear conductor and a film that covers the surface of the conductor. The conductor is made of a conductive metal material such as copper. The conductor is, for example, a flat copper wire with a rectangular cross section. The film is made of an electrically insulating resin material.

[0010] The winding 3 is formed in a circular disk shape. A plurality of windings 3 are arranged side by side in the Z direction. A winding spacer (horizontal spacer) 23 is arranged between adjacent windings 3 in the Z direction. The winding spacer 23 is formed in a rectangular plate shape from an electrically insulating material. The plurality of winding spacers 23 are arranged at equal angular intervals in the θ direction. A winding flow path (horizontal cooling path) 13 through which cooling gas flows is formed between adjacent windings 3 in the Z direction and adjacent winding spacers 23 in the θ direction.

[0011] The inner cylinder 4 is formed in a cylindrical shape from an electrically insulating material. The inner cylinder 4 is arranged coaxially with the winding 3 on the -R side of the winding 3. An inner spacer (inner vertical spacing piece) 24 is arranged between the winding 3 and the inner cylinder 4. The inner spacer 24 is formed in a rod shape with a rectangular cross section from an electrically insulating material. The inner spacer 24 arranges the winding 3 and the inner cylinder 4 at a first interval (inner vertical cooling path dimension) 3e in the R direction. The end of the winding spacer 23 on the -R side is connected to the inner spacer 24. A plurality of inner spacers 24 are arranged at equal angular intervals in the θ direction. An inner flow path (inner vertical cooling path) 14 through which the cooling gas flows is formed between the winding 3 and the inner cylinder 4 and between the inner spacers 24 adjacent to each other in the θ direction.

[0012] The outer cylinder 5 is formed in a cylindrical shape from an electrically insulating material. The outer cylinder 5 is arranged coaxially with the winding 3 on the +R side of the winding 3. An outer spacer (outer vertical spacing piece) 25 is arranged between the winding 3 and the outer cylinder 5. The outer spacer 25 is formed in a rod shape with a rectangular cross section from an electrically insulating material. The outer spacer 25 arranges the winding 3 and the outer cylinder 5 at a second spacing (outer vertical cooling path dimension) 3f in the R direction. The end of the winding spacer 23 on the +R side is connected to the outer spacer 25. A plurality of outer spacers 25 are arranged at equal angular intervals in the θ direction. An outer flow path (outer vertical cooling path) 15 through which the cooling gas flows is formed between the winding 3 and the outer cylinder 5 and between the outer spacers 25 adjacent to each other in the θ direction.

[0013] As shown in FIG. 2, the stationary induction motor 1 has an inner flow restrictor plate (inner blocking plate) 7 and an outer flow restrictor plate (outer blocking plate) 8. The inner flow control plate 7 and the outer flow control plate 8 are formed in a circular disk shape and made of an electrically insulating material. The inner flow control plate 7 and the outer flow control plate 8 are arranged coaxially with the windings 3. The inner flow control plate 7 and the outer flow control plate 8 are arranged between adjacent windings 3 in the Z direction. The inner flow control plate 7 and the outer flow control plate 8 are supported by winding spacers 23 (see FIG. 1).

[0014] The outer diameter of the inner flow control plate 7 is smaller than the inner diameter of the outer cylinder 5. The +R side of the inner flow control plate 7 is spaced apart from the outer cylinder 5 in the R direction. There is a gap 7f between the inner flow control plate 7 and the outer cylinder 5 in the R direction. The inner diameter of the outer flow control plate 8 is larger than the outer diameter of the inner tube 4. The -R side of the outer flow control plate 8 is spaced apart from the inner tube 4 in the R direction. There is a gap 8e between the outer flow control plate 8 and the inner tube 4 in the R direction.

[0015] The inner flow control plates 7 and the outer flow control plates 8 are alternately arranged at intervals in the Z direction. A subunit 9 is formed between the inner flow control plates 7 and the outer flow control plates 8 adjacent to each other in the Z direction. Each subunit 9 includes a plurality of windings 3. The inner flow control plates 7 and the outer flow control plates 8 are not arranged between the windings 3 adjacent to each other in the Z direction within each subunit 9. In the stationary induction motor 1, a plurality of subunits 9 are formed side by side in the Z direction. Of the plurality of subunits 9, the subunit 9 at the end on the -Z side is the first subunit 9. The subunit 9 adjacent to the first subunit 9 on the +Z side is the second subunit 9. The number of windings 3 included in the plurality of subunits 9 may be the same as or different from each other.

[0016] The winding 3 of the stationary induction machine 1 is cooled by a coolant. The coolant is a cooling gas, but it may also be a cooling liquid. The cooling gas is SF6, air, N2, CO2, etc. The cooling gas flows in from the -Z side of the stationary induction machine 1 and flows out to the +Z side.

[0017] For example, an inner flow control plate 7 is disposed at the end of the stationary induction machine 1 in the -Z direction. The cooling gas passes through the +R side of the inner flow control plate 7 and flows into the outer flow passage 15 of the first subunit 9. The cooling gas passes through the winding flow passage 13 and flows into the inner flow passage 14. As the cooling gas flows through the first subunit 9, it cools the multiple windings 3 included in the first subunit 9. The cooling gas passes through the -R side of the outer flow control plate 8 and flows into the inner flow passage 14 of the second subunit 9.

[0018] The cooling gas flows in a bellows-like manner inside the stationary induction motor 1. For example, an inner flow control plate 7 is disposed at the end on the +Z side of the stationary induction motor 1. The cooling gas passes through the +R side of this inner flow control plate 7 and flows out of the stationary induction motor 1.

[0019] 3 is an enlarged view of a side cross section of the stationary induction machine 1 at part III in FIG. 2. As described above, the inner flow control plate 7 has a gap 7f between it and the outer cylinder 5 in the R direction. The size of the gap 7f is equal to or larger than the second gap 3f between the winding 3 and the outer cylinder 5. In other words, the inner flow control plate 7 does not protrude from the +R side end of the winding 3 to the +R side. The inner flow control plate 7 does not obstruct the flow of the cooling gas in the outer flow passage 15 to the +Z side.

[0020] In addition, the inner flow control plate 7 has a third gap (inner blocking plate leakage dimension) 7e between it and the inner cylinder 4 in the R direction. The size of the third gap 7e is less than the first gap 3e between the winding 3 and the inner cylinder 4. That is, the inner flow control plate 7 protrudes from the end of the winding 3 on the -R side to the -R side. A part of the cooling gas flowing through the inner flow passage 14 on the +Z side collides with the inner flow control plate 7 and flows into the winding flow passage 13. On the other hand, the remaining part of the cooling gas passes through the -R side of the inner flow control plate 7 and flows into the inner flow passage 14 of the subunit 9 adjacent to the +Z side. This suppresses pressure loss of the cooling gas.

[0021] As described above, the outer flow control plate 8 has a gap 8e between it and the inner cylinder 4 in the R direction. The size of the gap 8e is equal to or larger than the first gap 3e between the winding 3 and the inner cylinder 4. In other words, the outer flow control plate 8 does not protrude toward the -R side from the -R side end of the winding 3. The outer flow control plate 8 does not obstruct the flow of cooling gas in the inner flow passage 14 toward the +Z side.

[0022] In addition, the outer flow control plate 8 has a fourth gap (outer blocking plate leakage dimension) 8f between it and the outer cylinder 5 in the R direction. The size of the fourth gap 8f is less than the second gap 3f between the winding 3 and the outer cylinder 5. That is, the outer flow control plate 8 protrudes from the end of the winding 3 on the +R side to the +R side. A part of the cooling gas flowing through the outer flow passage 15 on the +Z side collides with the outer flow control plate 8 and flows into the winding flow passage 13. On the other hand, the remaining part of the cooling gas passes through the +R side of the outer flow control plate 8 and flows into the outer flow passage 15 of the subunit 9 adjacent to the +Z side. This suppresses pressure loss of the cooling gas.

[0023] There may be a difference between the first interval 3e and the second interval 3f. In this case, a difference is also provided between the third interval 7e and the fourth interval 8f. When the first interval 3e is larger than the second interval 3f, the third interval 7e is made larger than the fourth interval 8f. When the second interval 3f is larger than the first interval 3e, the fourth interval 8f is made larger than the third interval 7e. This suppresses pressure loss of the cooling gas flowing through the inner flow passage 14 and the outer flow passage 15.

[0024] It is desirable that the second interval 3f be greater than the first interval 3e, and that the fourth interval 8f be greater than the third interval 7e. It is assumed that the second interval 3f of the outer flow passage 15 and the first interval 3e of the inner flow passage 14 are the same. In this case, the flow passage cross-sectional area of ​​the outer flow passage 15 is larger than the flow passage cross-sectional area of ​​the inner flow passage 14. If the second interval 3f is larger than the first interval 3e and the fourth interval 8f is larger than the third interval 7e, the flow passage cross-sectional area of ​​the outer flow passage 15 becomes significantly larger than the flow passage cross-sectional area of ​​the inner flow passage 14. This significantly suppresses the pressure loss of the cooling gas.

[0025] As described above in detail, the stationary induction electric machine 1 of the first embodiment has the winding 3, the inner cylinder 4, the outer cylinder 5, the inner flow control plate 7, and the outer flow control plate 8. The winding 3 is wound in a circular disk shape. The inner cylinder 4 is disposed inside the winding 3 with a first interval 3e between them in the R direction. The outer cylinder 5 is disposed outside the winding 3 with a second interval 3f between them in the R direction. The inner flow control plate 7 is disposed between adjacent windings 3 in the Z direction. The inner flow control plate 7 has an interval 7f between it and the outer cylinder 5 in the R direction that is equal to or greater than the second interval 3f. The inner flow control plate 7 has a third interval 7e between it and the inner cylinder 4 in the R direction that is less than the first interval 3e. The outer flow control plate 8 is disposed between adjacent windings 3 in the Z direction. The outer flow control plate 8 has an interval 8e between it and the inner cylinder 4 in the R direction that is equal to or greater than the first interval 3e. The outer flow control plate 8 has a fourth interval 8f between it and the outer cylinder 5 in the R direction, which is less than the second interval 3f. The inner flow control plate 7 and the outer flow control plate 8 are alternately arranged at intervals in the Z direction. When the first interval 3e is larger than the second interval 3f, the third interval 7e is larger than the fourth interval 8f. When the second interval 3f is larger than the first interval 3e, the fourth interval 8f is larger than the third interval 7e. This suppresses pressure loss of the cooling gas flowing through the inner flow passage 14 and the outer flow passage 15. Therefore, the cooling performance of the stationary induction motor 1 can be improved.

[0026] It is desirable that the second interval 3f be greater than the first interval 3e, and that the fourth interval 8f be greater than the third interval 7e. In this case, the cross-sectional area of ​​the outer flow passage 15 through which the cooling gas flows is significantly larger than the cross-sectional area of ​​the inner flow passage 14. This suppresses pressure loss of the cooling gas, thereby improving the cooling performance of the stationary induction motor 1.

[0027] The stationary induction motor 1 of the first embodiment has a winding spacer 23, an inner spacer 24, and an outer spacer 25. The winding spacer 23 is disposed between adjacent windings 3 in the Z direction, and is spaced apart in the θ direction. The inner spacer 24 is disposed between the winding 3 and the inner tube 4 in the R direction, and is spaced apart in the θ direction. The outer spacer 25 is disposed between the winding 3 and the outer tube 5 in the R direction, and is spaced apart in the θ direction.

[0028] The winding spacers 23 form a winding flow path 13 through which the cooling gas flows between the windings 3 adjacent in the Z direction and between the winding spacers 23 adjacent in the θ direction. The inner spacers 24 form an inner flow path 14 through which the cooling gas flows between the windings 3 and the inner tube 4 and between the inner spacers 24 adjacent in the θ direction. The inner spacers 24 arrange the windings 3 and the inner tube 4 with a first interval 3e in the R direction. The outer spacers 25 form an outer flow path 15 through which the cooling gas flows between the windings 3 and the outer tube 5 and between the outer spacers 25 adjacent in the θ direction. The outer spacers 25 arrange the windings 3 and the outer tube 5 with a second interval 3f in the R direction. These features improve the cooling performance of the stationary induction electric device 1.

[0029] Second Embodiment 4 is a schematic configuration diagram of a stationary induction electric assembly 10 according to the second embodiment. Description of the second embodiment that is similar to the first embodiment may be omitted.

[0030] The stationary induction electric assembly 10 includes an iron core 31, a first unit 1A, a second unit 1B, a tank 32, and a pressure plate (clamping plate) 33. The iron core 31 is formed into a cylindrical shape from a metal material such as iron. The first unit 1A is disposed outside the iron core 31 in the R direction. The second unit 1B is disposed outside the first unit 1A in the R direction.

[0031] Each of the first unit 1A and the second unit 1B has a winding 3, an inner cylinder 4, an outer cylinder 5, an inner flow control plate 7, and an outer flow control plate 8. The winding 3 is wound in a circular disk shape. A plurality of windings 3 are arranged side by side in the Z direction. Between adjacent windings 3 in the Z direction, a winding passage 13 (see FIG. 1-3) through which a cooling gas flows is formed. Note that the winding passage 13 is omitted in FIG. 4-6.

[0032] The inner cylinder 4 is disposed inside the winding 3 in the direction R. Between the winding 3 and the inner cylinder 4, an inner flow passage 14 is formed through which a cooling gas flows. External cylinder 5 is disposed outside winding 3 in direction R. Between winding 3 and external cylinder 5, an outer flow passage 15 is formed through which cooling gas flows.

[0033] The inner flow control plate 7 is disposed between adjacent windings 3 in the Z direction. The inner flow control plate 7 is disposed spaced apart from the outer cylinder 5 in the R direction. The outer flow control plate 8 is disposed between adjacent windings 3 in the Z direction. The outer flow control plate 8 is disposed spaced apart from the inner cylinder 4 in the R direction. The inner flow control plates 7 and the outer flow control plates 8 are alternately arranged at intervals in the Z direction.

[0034] Tank 32 accommodates iron core 31, first unit 1A, second unit 1B and pressure plate 33. Pressing plate 33 is disposed outside first unit 1A and second unit 1B in the Z direction. -Z side pressing plate 33d and +Z side pressing plate 33u are attracted to each other by a fastening member or the like. As a result, pressing plate 33 presses winding 3 of first unit 1A and winding 3 of second unit 1B in the Z direction.

[0035] The pressure plate 33 is disposed away from the tank 32 in the R direction. As a result, a flow path for the cooling gas is formed on the +R side of the pressure plate 33. When the flow path for the cooling gas is formed on the +R side of the pressure plate 33, the flow path cross-sectional area is larger than when the flow path is formed on the -R side. As a result, pressure loss of the cooling gas is suppressed.

[0036] The pressing plate 33 is disposed apart from the first unit 1A and the second unit 1B in the Z direction. In the Z direction, a first flow path 11 through which a cooling gas flows is formed between the first unit 1A and the second unit 1B and the pressing plate 33. Specifically, a first flow path 11d is formed on the -Z side of the first unit 1A and the second unit 1B, and a first flow path 11u is formed on the +Z side.

[0037] As described above, the inner flow control plates 7 and the outer flow control plates 8 are alternately arranged at intervals in the Z direction. The inner flow control plates 7d, 7u are arranged at the ends of the second unit 1B in the Z direction. Specifically, the inner flow control plate 7d is arranged at the end on the -Z side, and the inner flow control plate 7u is arranged at the end on the +Z side.

[0038] In the Z direction, a notch 6d is formed at the end on the -Z side (first side) of the outer tube 5 of the second unit 1B. As a result, the -Z side end 5d of the outer tube 5 of the second unit 1B is disposed inside (on the +Z side) in the Z direction from the inner flow control plate 7d. In the Z direction, the end 5d is disposed at a position equivalent to that of the outer flow control plate 8 adjacent to the +Z side of the inner flow control plate 7d. As a result, all of the winding passages 13 included in the subunit 9d at the end on the -Z side are exposed in the +R direction through the notch 6d. In the θ direction, the notch 6d is formed in a range equivalent to that of the outer passage 15.

[0039] In the Z direction, a notch 6u is formed at the end on the +Z side (first side) of the outer tube 5 of the second unit 1B. As a result, the end 5u on the +Z side of the outer tube 5 of the second unit 1B is positioned on the inner side (-Z side) in the Z direction than the inner flow control plate 7u. In the Z direction, the end 5u is positioned at the same position as the outer flow control plate 8 adjacent to the -Z side of the inner flow control plate 7u. As a result, all of the winding passages 13 included in the subunit 9u at the end on the +Z side are exposed in the +R direction through the notch 6u. In the θ direction, the notch 6u is formed in the same range as the outer passage 15. Both the notch 6d and the notch 6u may be formed, or only one of them may be formed.

[0040] A blocking plate (stopping plate) 35 is installed between the outer cylinder 5 of the second unit 1B and the tank 32. The blocking plate 35 blocks the gap between the outer cylinder 5 of the second unit 1B and the tank 32. The blocking plate 35 is disposed at an arbitrary position in the Z direction. For example, the blocking plate 35 is disposed at a position equivalent to the end 5d on the -Z side of the outer cylinder 5 of the second unit 1B in the Z direction.

[0041] The flow of the cooling gas will now be described. The cooling gas flows from the -Z side of the pressing plate 33d on the -Z side through the +R side of the pressing plate 33d to the +Z side of the pressing plate 33d. The cooling gas collides with the blocking plate 35 and changes course to the -R side. A part of the cooling gas passes through the notch 6d of the outer cylinder 5 of the second unit 1B, crosses the outer flow passage 15, and flows into the winding flow passage 13. As described above, all the winding flow passages 13 included in the subunit 9d at the end on the -Z side are exposed in the +R direction through the notch 6d. The cooling gas can flow into all the winding flow passages 13 included in the subunit 9d.

[0042] The cooling gas flows through the second unit 1B in the same manner as in the first embodiment. The cooling gas flows out from the winding passage 13 included in the subunit 9u at the end on the +Z side to the +R side. The cooling gas crosses the outer passage 15, passes through the notch 6u, and collides with the tank 32. The cooling gas changes course to the +Z side, passes through the +R side of the pressing plate 33u on the +Z side, and flows out to the +Z side of the pressing plate 33u.

[0043] As described above, the cooling gas collides with the blocking plate 35 and changes its course to the -R side. A part of the cooling gas flows into the second unit 1B. The remaining part of the cooling gas flows into the first flow passage 11d on the -Z side. The cooling gas flows into the first unit 1A from between the outer cylinder 5 and the inner flow control plate 7d of the first unit 1A. The cooling gas flows through the inside of the first unit 1A, as in the first embodiment. The cooling gas flows into the first flow passage 11u on the +Z side from between the outer cylinder 5 and the inner flow control plate 7u. The cooling gas flowing out from the first flow passage 11u to the +R side flows out to the +Z side of the pressing plate 33u, similar to the cooling gas flowing out from the second unit 1B.

[0044] FIG. 6 is a schematic diagram of a static induction electric assembly 10 in the prior art. In this static induction electric assembly 10, no notch is formed at the Z-direction end of the outer tube 5 of the second unit 1B. The cooling gas flows into and out of the second unit 1B through a gap between the inner tube 4 and the outer flow restrictor plate 8 of the second unit 1B. In order to ensure the flow rate of the cooling gas in the second unit 1B, second flow paths 12d and 12u are formed between the first flow path 11 and the second unit 1B in the Z direction. A part of the cooling gas flows into the second unit 1B through the second flow path 12d on the -Z side. The cooling gas flows out of the second unit 1B through the second flow path 12u on the +Z side.

[0045] In contrast, in the stationary induction electric assembly 10 of the second embodiment shown in FIG. 4, notches 6d, 6u are formed at the Z-direction end of the outer tube 5 of the second unit 1B. A part of the cooling gas flows into the second unit 1B through the notch 6d. The cooling gas flows out of the second unit 1B through the notch 6u. Therefore, it is not necessary to form the second flow paths 12d, 12u between the first flow path 11 and the second unit 1B. This makes it possible to reduce the size of the stationary induction electric assembly 10 in the Z direction.

[0046] SF6 gas used as a cooling gas has excellent insulating and cooling performance, but has a high global warming potential. Therefore, the use of naturally occurring gases such as air, N2, and CO2 as alternative gases to SF6 is being considered. Naturally occurring gases have inferior insulating and cooling performance compared to SF6 gas. Therefore, when naturally occurring gases are used, the stationary induction electric assembly 10 becomes large. In contrast, in the second embodiment, the stationary induction electric assembly 10 can be made smaller in size.

[0047] As described above, in the stationary induction electric machine assembly 10 shown in Fig. 6, the cooling gas flows into and out of the second unit 1B through the gap between the inner cylinder 4 and the outer flow restrictor plate 8 of the second unit 1B. Therefore, after the cooling gas passes through the +R side of the pressure plate 33d on the -Z side, it changes course twice before flowing into the second unit 1B. Similarly, after the cooling gas flows out of the second unit 1B, it changes course twice before passing through the +R side of the pressure plate 33u on the +Z side.

[0048] In contrast, in the stationary induction electric assembly 10 shown in FIG. 4, the cooling gas flows into and out of the second unit 1B through the notches 6d, 6u of the outer cylinder 5 of the second unit 1B. Therefore, after the cooling gas passes through the +R side of the pressure plate 33d on the -Z side, it flows into the second unit 1B with only one change of course. Similarly, after the cooling gas flows out of the second unit 1B, it passes through the +R side of the pressure plate 33u on the +Z side with only one change of course. This suppresses pressure loss of the cooling gas.

[0049] As described above in detail, the stationary induction electric assembly 10 in the second embodiment has the iron core 31, the first unit 1A, the second unit 1B, the pressing plate 33, and the tank 32. The first unit 1A is disposed outside the iron core 31 in the R direction. The second unit 1B is disposed outside the first unit 1A in the R direction. The pressing plate 33 is disposed outside the first unit 1A and the second unit 1B in the Z direction. The tank 32 accommodates the iron core 31, the first unit 1A, the second unit 1B, and the pressing plate 33. The first unit 1A and the second unit 1B have the winding 3, the inner cylinder 4, the outer cylinder 5, the inner flow control plate 7, and the outer flow control plate 8. The winding 3 is wound in a circular disk shape. The inner cylinder 4 is disposed inside the winding 3 in the R direction. The outer cylinder 5 is disposed outside the winding 3 in the R direction. The inner flow control plate 7 is disposed between adjacent windings 3 in the Z direction. The inner flow control plate 7 is disposed away from the outer tube 5 in the R direction. The outer flow control plate 8 is disposed between adjacent windings 3 in the Z direction. The outer flow control plate 8 is disposed away from the inner tube 4 in the R direction. The inner flow control plate 7 and the outer flow control plate 8 are disposed alternately at intervals in the Z direction. The inner flow control plate 7 is disposed at the end of the second unit 1B in the Z direction. The pressing plate 33 presses the windings 3 of the first unit 1A and the windings 3 of the second unit 1B in the Z direction. The pressing plate 33 is disposed away from the tank 32 in the R direction. In the Z direction, the end of the first side of the outer tube 5 of the second unit 1B is disposed inside the inner flow control plate 7 disposed at the end of the first side of the second unit 1B. Between the outer tube 5 of the second unit 1B and the tank 32, a blocking plate 35 is installed to block the gap between them.

[0050] The end of the outer tube 5 of the second unit 1B is formed with notches 6d, 6u. The cooling gas flows into and out of the second unit 1B through the notches 6d, 6u. There is no need to form the second flow paths 12d, 12u to allow the cooling gas to flow into and out of the second unit 1B. This allows the stationary induction assembly 10 to be made smaller. This reduces the number of times the cooling gas changes course. This reduces the pressure loss of the cooling gas, and improves the cooling performance of the stationary induction assembly 10.

[0051] 5 is a schematic diagram of a stationary induction electric assembly 10 in a modified example of the second embodiment. The stationary induction electric assembly 10 in the modified example is different from the second embodiment in the shape of the pressing plate 33. Description of the modified example that is the same as the second embodiment may be omitted.

[0052] The pressing plate 33 is disposed away from the inner cylinder 4 of the first unit 1A in the R direction. This forms a flow path for the cooling gas on the -R side of the pressing plate 33 in addition to the +R side. The pressing plate 33 has a through space 34 that penetrates the pressing plate 33 in the Z direction. The through space 34 is formed in the middle of the pressing plate 33 in the R direction. The through space 34 may be a slit extending in the θ direction, or may be a plurality of through holes spaced apart in the θ direction. The pressure plate 33 may have both the flow path and the through space 34 on the -R side, or may have only one of them.

[0053] Since the pressure plate 33 has a flow passage or a through space 34 on the -R side, the cooling gas can easily flow into and out of the first unit 1A. This reduces pressure loss of the cooling gas, and improves the cooling performance of the stationary induction assembly 10.

[0054] According to at least one of the embodiments described above, when the first interval 3e is larger than the second interval 3f, the third interval 7e is larger than the fourth interval 8f. When the second interval 3f is larger than the first interval 3e, the fourth interval 8f is larger than the third interval 7e. This can improve the cooling performance.

[0055] Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope of the invention and its equivalents described in the claims, as well as in the scope and spirit of the invention. [Explanation of symbols]

[0056] 1...static induction motor, 1A...first unit, 1B...second unit, 3...winding, 3e...first interval, 3f...second interval, 4...inner cylinder, 5...outer cylinder, 7...inner flow control plate, 7e...third interval, 8...outer flow control plate, 8f...fourth interval, 10...static induction motor assembly, 23...winding spacer, 24...inner spacer, 25...outer spacer, 31...iron core, 32...tank, 33...pressure plate, 34...through space, 35...blocking plate.

Claims

1. A winding wound in a circular disk shape; an inner cylinder disposed inside the winding with a first gap between the inner cylinder and the winding in a radial direction of the winding; an outer cylinder disposed outside the winding with a second gap between the outer cylinder and the winding in the radial direction; an inner flow control plate disposed between adjacent windings in an axial direction of the windings, the inner flow control plate having a gap between the outer cylinder and the inner cylinder in the radial direction that is equal to or larger than the second gap, and a third gap between the inner cylinder and the outer cylinder in the radial direction that is less than the first gap; an outer flow control plate disposed between adjacent ones of the windings in the axial direction, the outer flow control plate having a distance between the inner cylinder and the outer cylinder in the radial direction that is equal to or greater than the first distance, and a fourth distance between the outer cylinder and the inner cylinder in the radial direction that is less than the second distance, The inner flow restrictor plate and the outer flow restrictor plate are alternately arranged at intervals in the axial direction, When the first interval is greater than the second interval, the third interval is greater than the fourth interval, and when the second interval is greater than the first interval, the fourth interval is greater than the third interval. Stationary induction appliance.

2. the second interval being greater than the first interval and the fourth interval being greater than the third interval; The static induction motor according to claim 1.

3. a winding spacer disposed between adjacent ones of the windings in the axial direction and spaced apart in a circumferential direction of the windings; an inner spacer disposed between the winding and the inner cylinder in the radial direction and spaced apart in the circumferential direction; an outer spacer disposed between the winding and the outer cylinder in the radial direction and spaced apart in the circumferential direction; The static induction device according to claim 1 or 2.

4. Iron core and a first unit disposed radially outside the iron core; a second unit disposed outside the first unit in the radial direction; a pressure plate disposed outside the first unit and the second unit in the axial direction of the iron core; a tank that accommodates the iron core, the first unit, the second unit, and the pressing plate, The first unit and the second unit are A winding wound in a circular disk shape; an inner cylinder disposed inside the winding in the radial direction; an outer cylinder disposed outside the winding in the radial direction; an inner flow control plate disposed between adjacent ones of the windings in the axial direction and spaced apart from the outer cylinder in the radial direction; an outer flow control plate disposed between adjacent ones of the windings in the axial direction and spaced apart from the inner cylinder in the radial direction; The inner flow restrictor plate and the outer flow restrictor plate are alternately arranged at intervals in the axial direction, The inner flow restrictor is disposed at an end of the second unit in the axial direction, the pressing plate presses the winding of the first unit and the winding of the second unit in the axial direction; The pressing plate is disposed at a distance from the tank in the radial direction, In the axial direction, a first side end of the outer cylinder of the second unit is disposed inside the inner flow control plate disposed at the first side end of the second unit, A blocking plate is provided between the outer cylinder of the second unit and the tank to block the gap between them. Stationary induction electrical assembly.

5. The pressing plate is disposed apart from the inner cylinder of the first unit in the radial direction.

5. The stationary inductor assembly of claim 4.

6. The pressure plate has a through space passing through the pressure plate in the axial direction.

6. A stationary induction motor assembly according to claim 4 or 5.

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