CN114221491A - Superconductive motor rotor heat exchanger structure - Google Patents
Superconductive motor rotor heat exchanger structure Download PDFInfo
- Publication number
- CN114221491A CN114221491A CN202111474776.3A CN202111474776A CN114221491A CN 114221491 A CN114221491 A CN 114221491A CN 202111474776 A CN202111474776 A CN 202111474776A CN 114221491 A CN114221491 A CN 114221491A
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- Prior art keywords
- heat exchanger
- hole
- gasket
- fin
- rotor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/22—Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
- H02K9/227—Heat sinks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/18—Casings or enclosures characterised by the shape, form or construction thereof with ribs or fins for improving heat transfer
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K55/00—Dynamo-electric machines having windings operating at cryogenic temperatures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Superconductive Dynamoelectric Machines (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The invention relates to a superconductive motor rotor heat exchanger structure, wherein a through hole is arranged in the center of a rotor, the heat exchanger structure is arranged in the through hole, the heat exchanger structure comprises a plurality of heat exchanger units which are sequentially arranged along the axial direction of the through hole and a partition plate arranged between adjacent heat exchanger units, and each heat exchanger unit comprises a finned heat exchanger and gaskets arranged on two sides of the finned heat exchanger; the outer diameters of the fin heat exchanger, the gasket and the partition plate are matched with the diameter of the through hole, and the fin heat exchanger is provided with a plurality of heat exchange holes which are uniformly distributed along the circumferential direction of the fin heat exchanger; the gasket is annular, and the inner side space forms a disc-shaped air cavity; the center of the clapboard is provided with an air hole; the two ends of the heat exchange hole and the air hole are respectively communicated with the air cavities of the corresponding gaskets; end flanges are arranged at two ends of the rotor corresponding to the through holes, a cooling pipe is arranged in the center of each end flange, and the cooling pipe is communicated with an air cavity of a gasket at the end part of the heat exchanger structure; the heat exchanger has the advantages of uniform flow distribution and high heat transfer efficiency.
Description
Technical Field
The invention relates to a rotor heat exchanger structure of a superconducting motor, and belongs to the technical field of heat exchange of superconducting motors.
Background
Motors and generators based on high temperature superconducting technology have a series of advantages of small volume, light weight, low loss, high efficiency and the like, so that the huge benefits of high temperature superconducting motors in the aspects of cost, volume, weight and the like will cause huge revolution of the whole motor manufacturing industry in the near future.
The cooling system of the high-temperature superconducting motor comprises a rotor cooling system and a stator cooling system. The cooling system of the rotor is used for taking away the loss generated by the superconducting coil and other magnetic materials when the motor works and the heat transmitted to the rotor from the external environment in time, keeping the superconducting state of the coil and ensuring the continuous normal operation of the motor, and is one of the main differences between the superconducting motor and a common motor.
The main part of the cooling system of the rotor is a cooling loop in the rotor, and the basic arrangement mode is that pipelines are processed on the basic and rotary frameworks of the superconducting coil and are connected with a low-temperature air inlet/liquid inlet pipe, and the superconducting coil is cooled by a low-temperature medium in the pipelines. This structure has the following problems: the difficulty of processing a groove for placing a pipeline from a thin coil substrate is high, so that the thin substrate is easy to deform; the pipeline and the substrate groove always have a certain gap, and the pipeline and the substrate groove are generally filled with epoxy resin at present, but the thermal conductivity of the epoxy resin is low, so that the heat transfer efficiency is greatly influenced; the pipelines need to be connected in series and in parallel, wherein the series connection causes the increase of flow resistance and the large temperature difference between the head and the tail, and the parallel connection causes the uneven gas/liquid flow distribution, thereby affecting the heat transfer effect and the uniformity of the temperature distribution of the whole structure; the structure processing amount is large, and the processing precision is high; the pipelines are more, the connecting joints are more, and the problem of vacuum leakage is easy to occur.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a rotor heat exchanger structure of a superconducting motor, which has uniform flow distribution and high heat transfer efficiency.
In order to achieve the purpose, the technical scheme provided by the invention is as follows: a superconducting motor rotor heat exchanger structure is characterized in that a through hole is formed in the center of a rotor, the heat exchanger structure is arranged in the through hole and comprises a plurality of heat exchanger units and partition plates, the heat exchanger units are sequentially arranged along the axial direction of the through hole, the partition plates are arranged between every two adjacent heat exchanger units, and each heat exchanger unit comprises a finned heat exchanger and gaskets arranged on two sides of the finned heat exchanger; the outer diameters of the fin heat exchanger, the gasket and the partition plate are matched with the diameter of the through hole, and the fin heat exchanger is provided with a plurality of heat exchange holes which are uniformly distributed along the circumferential direction of the fin heat exchanger; the gasket is annular, and the inner side space of the gasket forms a disc-shaped air cavity; the center of the clapboard is provided with an air hole; the two ends of the heat exchange holes and the two ends of the air holes are respectively communicated with the air cavities of the corresponding gaskets; end flanges are arranged at two ends of the rotor corresponding to the through holes, a cooling pipe is arranged at the center of each end flange, and the cooling pipe is communicated with an air cavity of a gasket at the end part of the heat exchanger structure.
The technical scheme is further designed as follows: the cross sections of the heat exchange holes are strip-shaped and are arranged along the radial direction of the fin heat exchanger.
The part between the outer surface of the fin heat exchanger and one end, close to the outer diameter, of the plurality of heat exchange holes is an outer ring, and the part between the center of the fin heat exchanger and one end, close to the center, of the plurality of heat exchange holes is an inner core; the inner diameter of the gasket is matched with the inner diameter of the outer ring of the fin heat exchanger, and the diameter of the air hole is smaller than that of the inner core of the fin heat exchanger.
The thickness of the finned heat exchanger is larger than that of the gasket, and the thickness of the gasket is larger than that of the partition plate.
And a sealing ring is arranged between the end flange and the end part of the rotor.
Compared with the prior art, the invention has the beneficial effects that:
in the heat exchanger structure, the plurality of heat exchange holes are uniformly distributed along the circumference, so that the flow resistance among the transmission channels is balanced, the parallel gas/liquid branches are uniformly distributed, and the heat transfer efficiency is high; meanwhile, the flow resistance of the heat exchange structure is small, so that the pressure drop of the low-temperature medium along the transmission direction can be reduced, the frictional heat generation is reduced, and the working pressure of the low-temperature pump is reduced; the heat exchanger has large integral heat capacity and short transmission path, so that the temperature difference between the head and the tail of the heat exchanger is low, and the integral temperature distribution is uniform.
The heat exchanger has the advantages of simple structure, small processing amount, no complex assembly precision requirement and simple assembly; the heat exchange area can be flexibly adjusted according to the heat exchange power; and only 2 sealing structures are provided, so that the reliability is high.
Drawings
FIG. 1 is a schematic view of a rotor structure according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the heat exchanger of FIG. 1;
FIG. 3 is a schematic structural view of the finned heat exchanger in FIG. 2;
fig. 4 is a schematic view of the rotor end member of fig. 1.
In the figure: 1-heat exchanger, 11-fin heat exchanger, 111-outer ring, 112-fin, 113-inner core, 114-outer surface, 115-heat exchanging hole, 12-gasket, 13-baffle, 131-air hole, 14-air cavity, 2-superconducting motor rotor, 3-end element, 31-end flange, 32-cooling pipe and 33-sealing ring.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments.
Examples
As shown in fig. 1, the superconducting motor rotor heat exchanger structure of the present embodiment is disposed at a central position of a superconducting motor rotor 2, a through hole is disposed at a center of the superconducting motor rotor 2, and the heat exchanger structure 1 is disposed in the through hole and is configured to transmit cooling energy of a low-temperature medium to the superconducting motor rotor 2 and transmit external heat generated and absorbed by the superconducting motor rotor 2 to a circulating low-temperature medium, so as to maintain the superconducting motor rotor 2 working in a target temperature region.
Referring to fig. 2, the heat exchanger structure 1 includes a plurality of heat exchanger units sequentially arranged along the axial direction of the through hole, and a partition plate 13 disposed between adjacent heat exchanger units, each heat exchanger unit includes a fin heat exchanger 11 and gaskets 12 disposed on both sides of the fin heat exchanger 11; end parts 3 are arranged at two ends of the superconducting motor rotor 2, and the end parts 3 are used for fixing the heat exchanger structure 1 together with the superconducting motor rotor 2 and providing a gas-cooled heat exchange space for the heat exchanger structure 1.
As shown in fig. 2, the outer diameters of the finned heat exchanger 11, the gasket 12 and the partition plate 13 are all matched with the diameter of the through hole, and as shown in fig. 3, the finned heat exchanger 11 is provided with a plurality of heat exchange holes 115 uniformly distributed along the circumferential direction of the finned heat exchanger 11, the sections of the plurality of heat exchange holes 115 are strip-shaped and arranged along the radial direction of the finned heat exchanger 11, the annular part between the outer surface 114 of the finned heat exchanger 11 and one ends of the plurality of heat exchange holes 115 close to the outer diameter is an outer ring 111, the cylindrical part between the center of the finned heat exchanger 11 and one ends of the plurality of heat exchange holes 115 close to the center is an inner core 113, and the part between the inner core 113 and the outer ring 111 is divided into a plurality of fins 112 by the plurality of heat exchange holes 115; the gasket 12 is annular, and the inner side space forms a disc-shaped air cavity 14; the center of the partition plate 13 is provided with an air hole 131; both ends of the heat exchange hole 115 and the air hole 131 are respectively communicated with the air cavity 14 of the adjacent gasket 12; the inner diameter of the gasket 12 is matched with the inner diameter of the outer ring 111 of the fin heat exchanger, and the diameter of the air hole 131 is smaller than that of the inner core 113 of the fin heat exchanger.
The fin heat exchanger 11 is made of materials with high heat conductivity such as copper and aluminum; the fin heat exchanger 11 is cylindrical, the thickness of the fin heat exchanger 11 is 100-200mm, the fin heat exchanger 11 needs to rotate at a high speed when in use, and in order to ensure that the fins 112 do not deform under the high-speed rotation, the fins 112 are positioned inside the outer ring 111 of the cylindrical fin heat exchanger 11, all the fins 112 form a whole through the inner core 113 and the outer ring 111, and all the fins 112 are uniformly distributed along the circumference, so that the dynamic balance and the structural strength of the whole structure are ensured; the outer surface 114 of the fin heat exchanger 11 is a smooth surface layer, so that the fin heat exchanger 11 can be just coaxially sleeved in the central through hole of the superconducting motor rotor 2; during assembly, the outer surface 114 of the finned heat exchanger 11 is coated with a low-temperature heat conducting material, and a silicone grease with high heat conducting property at low temperature, such as an ashitaba grease, is usually adopted to ensure better heat conducting contact between the outer surface 114 and the central through hole of the superconducting motor rotor 2, so that the heat conducting property is improved.
The gasket 12 is of a circular ring-shaped structure, is made of the same material as the finned heat exchanger 11, and has an inner diameter equal to or slightly smaller than that of the outer ring 111; the gasket 12 is mainly used for forming an air cavity 14 for the fin heat exchanger 11, so that the thickness of the air cavity is not too small, and the size selected in the embodiment is 10-20mm, so as to provide a buffer area for the low-temperature medium and ensure that the low-temperature medium can uniformly flow through the fin heat exchanger 11.
The partition plate 13 is of a circular ring-shaped structure and is made of the same material as the finned heat exchanger 11; the diameter of the central air hole 131 is 20-30mm, and the central air hole is mainly used for providing a flow channel for a low-temperature medium; the thickness of the partition 13 is 5 to 10 mm.
In the embodiment, 2 gaskets 12, 1 fin heat exchanger 11 and 2 partition plates are used to form an air cavity 14 on each of two sides of the fin heat exchanger 11; the low-temperature medium is diffused to the first air cavity 14 after passing through the air hole 131 of the partition plate, and the air is uniformly distributed in the air cavity 14; then the gas uniformly flows through each heat exchange hole 115 of the fin heat exchanger 11 and exchanges heat with the fins 112; the low-temperature gas flows out of the fin heat exchanger 11 and then is collected in the second air cavity 14; the collected gas passes through the gas holes 131 of the second partition plate and then enters the next group of heat exchange units.
The function of the partition plate 13 is to avoid the formation of local uneven areas after the gas passes through the finned heat exchanger 11; the gas holes 131 through the partition plate 13 are converged again, so that the gas can flow more disorderly through the throttling effect of the gas holes, thereby improving the heat transfer effect.
As shown in fig. 4, the end members 3 at both ends of the rotor 2 of the superconducting motor include end flanges 31, a cooling pipe 32 is provided at the center of the end flanges 31, the cooling pipe 32 communicates with the air chamber 14 of the end gasket 12 of the heat exchanger structure 2, a sealing ring 33 is provided between the end flange 31 and the end of the rotor, and a sealing chamber is formed at the through hole part by the sealing ring 33 and the end flanges 31; the heat exchanger structure 1 is assembled in the sealed cavity; the cooling pipe 32 is used for being connected with a low-temperature medium pipeline of an external low-temperature refrigeration system and is coaxially fixed on a central hole of the end flange 31 in a welding mode; the other end of the cooling pipe 32 can be connected with an external low-temperature refrigeration system by welding, and transmits a low-temperature medium to the sealed cavity, so that the heat exchanger structure 1 is cooled.
The end flange 31 is made of stainless steel material and is of an annular structure; the superconducting motor rotor 2 is not connected through bolts and sealed through a sealing ring 33, so that an independent cavity is formed in a central through hole in the superconducting motor rotor 2, and low-temperature media cannot leak from the superconducting motor rotor 2; because the superconducting motor rotor 2 exists in a low-temperature environment, the sealing ring 33 needs to be made of a low-temperature resistant material, and a metal sealing ring or a polytetrafluoroethylene sealing ring is selected in the embodiment; the end flange 31 simultaneously axially fixes the heat exchanger structure 1 in the central through-hole of the superconducting motor rotor 2.
The technical solutions of the present invention are not limited to the above embodiments, and all technical solutions obtained by using equivalent substitution modes fall within the scope of the present invention.
Claims (5)
1. The utility model provides a superconductive motor rotor heat exchanger structure, the rotor center is equipped with the through-hole, and the heat exchanger structure sets up in the through-hole, its characterized in that: the heat exchanger structure comprises a plurality of heat exchanger units and a partition plate, wherein the heat exchanger units are sequentially arranged along the axial direction of the through hole, the partition plate is arranged between every two adjacent heat exchanger units, and each heat exchanger unit comprises a fin heat exchanger and gaskets arranged on two sides of the fin heat exchanger; the outer diameters of the fin heat exchanger, the gasket and the partition plate are matched with the diameter of the through hole, and the fin heat exchanger is provided with a plurality of heat exchange holes which are uniformly distributed along the circumferential direction of the fin heat exchanger; the gasket is annular, and the inner side space of the gasket forms a disc-shaped air cavity; the center of the clapboard is provided with an air hole; the two ends of the heat exchange holes and the two ends of the air holes are respectively communicated with the air cavities of the corresponding gaskets; end flanges are arranged at two ends of the rotor corresponding to the through holes, a cooling pipe is arranged at the center of each end flange, and the cooling pipe is communicated with an air cavity of a gasket at the end part of the heat exchanger structure.
2. The superconducting motor rotor heat exchanger structure of claim 1, wherein: the cross sections of the heat exchange holes are strip-shaped and are arranged along the radial direction of the fin heat exchanger.
3. The superconducting motor rotor heat exchanger structure of claim 2, wherein: the part between the outer surface of the fin heat exchanger and one end, close to the outer diameter, of the plurality of heat exchange holes is an outer ring, and the part between the center of the fin heat exchanger and one end, close to the center, of the plurality of heat exchange holes is an inner core; the inner diameter of the gasket is matched with the inner diameter of the outer ring of the fin heat exchanger, and the diameter of the air hole is smaller than that of the inner core of the fin heat exchanger.
4. The superconducting motor rotor heat exchanger structure of claim 1, wherein: the thickness of the finned heat exchanger is larger than that of the gasket, and the thickness of the gasket is larger than that of the partition plate.
5. The superconducting motor rotor heat exchanger structure of claim 1, wherein: and a sealing ring is arranged between the end flange and the end part of the rotor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111474776.3A CN114221491B (en) | 2021-12-02 | 2021-12-02 | Superconductive motor rotor heat exchanger structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111474776.3A CN114221491B (en) | 2021-12-02 | 2021-12-02 | Superconductive motor rotor heat exchanger structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114221491A true CN114221491A (en) | 2022-03-22 |
| CN114221491B CN114221491B (en) | 2023-07-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111474776.3A Active CN114221491B (en) | 2021-12-02 | 2021-12-02 | Superconductive motor rotor heat exchanger structure |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11235009A (en) * | 1998-02-18 | 1999-08-27 | Toshiba Corp | Current lead of rotor of superconducting rotating machine |
| US20080272661A1 (en) * | 2007-05-01 | 2008-11-06 | Tesla Motors, Inc. | Liquid cooled rotor assembly |
| CN102449889A (en) * | 2009-05-28 | 2012-05-09 | 西门子公司 | Cooling for superconducting machines |
| CN204100873U (en) * | 2014-05-29 | 2015-01-14 | 河南科隆集团有限公司 | Finned micro-channel heat exchanger |
| CN104883032A (en) * | 2015-04-21 | 2015-09-02 | 上海超导科技股份有限公司 | Rotating heat cylinder structure suitable for superconducting motor rotor coil cooling, and usage method of rotating heat cylinder structure |
| CN110635588A (en) * | 2018-08-31 | 2019-12-31 | 北京金风科创风电设备有限公司 | Iron-core medium transporting and heat exchanging device in electromagnetic device and eddy current separator |
-
2021
- 2021-12-02 CN CN202111474776.3A patent/CN114221491B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11235009A (en) * | 1998-02-18 | 1999-08-27 | Toshiba Corp | Current lead of rotor of superconducting rotating machine |
| US20080272661A1 (en) * | 2007-05-01 | 2008-11-06 | Tesla Motors, Inc. | Liquid cooled rotor assembly |
| CN102449889A (en) * | 2009-05-28 | 2012-05-09 | 西门子公司 | Cooling for superconducting machines |
| CN204100873U (en) * | 2014-05-29 | 2015-01-14 | 河南科隆集团有限公司 | Finned micro-channel heat exchanger |
| CN104883032A (en) * | 2015-04-21 | 2015-09-02 | 上海超导科技股份有限公司 | Rotating heat cylinder structure suitable for superconducting motor rotor coil cooling, and usage method of rotating heat cylinder structure |
| CN110635588A (en) * | 2018-08-31 | 2019-12-31 | 北京金风科创风电设备有限公司 | Iron-core medium transporting and heat exchanging device in electromagnetic device and eddy current separator |
Non-Patent Citations (1)
| Title |
|---|
| 陈彪 等: "高温超导电机转子冷却技术的研究", 电工技术学报, vol. 26, no. 10, pages 143 - 151 * |
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| CN114221491B (en) | 2023-07-14 |
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