CN111128469A - Superconducting cable with return current path - Google Patents
Superconducting cable with return current path Download PDFInfo
- Publication number
- CN111128469A CN111128469A CN202010021675.XA CN202010021675A CN111128469A CN 111128469 A CN111128469 A CN 111128469A CN 202010021675 A CN202010021675 A CN 202010021675A CN 111128469 A CN111128469 A CN 111128469A
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- Prior art keywords
- superconducting cable
- layer
- heat insulation
- insulation layer
- return path
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
- H01B12/16—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by cooling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
- H01B12/02—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by their form
- H01B12/12—Hollow conductors
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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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Abstract
The present invention provides a superconducting cable with a return passage, comprising: the cable comprises an inner supporting tube, a conductor layer, a shielding layer and an outer protective layer which are arranged from inside to outside in sequence, wherein the inner supporting tube is of a hollow structure; the method is characterized in that: the shielding layer with be equipped with two heat insulation layers, two between the outer jacket the heat insulation layer is interior heat insulation layer and outer heat insulation layer respectively, interior heat insulation layer with be equipped with the interval between the outer heat insulation layer. In the invention, the return channel is integrated on the superconducting cable, so that the volume of the superconducting cable is reduced, the heat leakage level of the superconducting cable is reduced, and the operation efficiency of the superconducting cable is improved.
Description
Technical Field
The invention relates to the technical field of cable structures, in particular to a superconducting cable with a backflow channel.
Background
The existing superconducting cable generally adopts flowing liquid nitrogen as a cooling medium, and comprises an inner supporting tube, a conductor layer, a shielding layer, a heat insulating layer and an outer protective layer which are sequentially arranged from inside to outside; the inner supporting pipe is of a hollow structure, a cooling medium passes through the space between the shielding layer and the heat insulating layer, the cooling medium enters the inner supporting pipe, and flows back through the space between the shielding layer and the heat insulating layer after being introduced into the water tank, so that the cooling medium forms circulation, the cooling medium can absorb heat after entering the inner supporting pipe, and when the cooling medium flows back through the space between the shielding layer and the heat insulating layer, the heat absorbed by the cooling medium can be transmitted to the end part of the shielding layer of the superconducting cable, and in order to uniformly cool most areas of the superconducting cable, an external refrigerant circulation channel is required outside the superconducting cable, so that the space occupied by a cable system is increased; and the heat absorbed by the cooling medium is conducted to the end of the superconducting cable to increase the heat leakage phenomenon of the superconducting cable.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a superconducting cable with a return channel.
In order to solve the above technical problem, the present invention provides a superconducting cable with a return path, comprising: the cable comprises an inner supporting tube, a conductor layer, a shielding layer and an outer protective layer which are arranged from inside to outside in sequence, wherein the inner supporting tube is of a hollow structure; the method is characterized in that: the shielding layer with be equipped with two heat insulation layers, two between the outer jacket the heat insulation layer is interior heat insulation layer and outer heat insulation layer respectively, interior heat insulation layer with be equipped with the interval between the outer heat insulation layer.
Preferably, interior heat insulation layer with outer heat insulation layer is the vacuum pipe fitting, the vacuum pipe fitting includes interior pipe portion and cover and establishes the outside outer tube portion of interior pipe portion, interior pipe portion with evacuation between the outer tube portion.
Furthermore, the outer wall of the inner pipe part of the vacuum pipe fitting and the inner wall of the outer pipe part of the vacuum pipe fitting are coated with radiation-proof films, and the black body radiation coefficient of each radiation-proof film is less than 0.5W/(m)2·K4)。
Furthermore, the radiation protection film is made of an aluminum-plated film.
Preferably, the inner heat insulation layer is a single-layer structure, and the single-layer structure is made of a material with a thermal conductivity coefficient smaller than 1W/(m.K).
Further, the single-layer structure is made of fluoroplastic.
Preferably, the inner support tube is a flexible tube.
Further, the flexible pipe is of a bellows structure.
Preferably, the inner support pipe is used for the inflow of the cooling medium, and the interval arranged between the inner heat insulation layer and the outer heat insulation layer is used for the backflow of the cooling medium.
As described above, the superconducting cable with a return path of the present invention has the following advantageous effects:
the inner support pipe is used for cooling medium to flow in, and the interval arranged between the inner heat-insulating layer and the outer heat-insulating layer is used for cooling medium to flow back, namely, the interval arranged between the inner heat-insulating layer and the outer heat-insulating layer is used as a return channel, the arrangement of the return channel ensures that the heat absorbed by the cooling medium is blocked by the inner heat-insulating layer in the process of flowing back, the heat cannot be conducted to the inside, and the heat at the end part of the shielding layer of the superconducting cable cannot rise, so that an external refrigerant return pipeline is not needed outside the superconducting cable; in the invention, the return channel is integrated on the superconducting cable, so that the volume of the superconducting cable is reduced, the heat leakage level of the superconducting cable is reduced, and the operation efficiency of the superconducting cable is improved.
Drawings
Fig. 1 is a schematic view showing an internal structure of a superconducting cable with a return path of example 1.
Fig. 2 is a schematic view showing an internal structure of the superconducting cable with a return path of example 2.
Description of the reference numerals
100 internal support tube
200 conductive layer
210 inner superconductor
220 intermediate superconductor
230 outer superconductor
300 shield layer
400 outer jacket
500 inner insulating layer
510 inner pipe portion of inner insulating layer
520 outer pipe portion of inner insulating layer
600 outer insulating layer
610 inner pipe portion of outer insulation layer
620 outer pipe portion of outer insulating layer
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Please refer to the attached drawings. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Example 1
As shown in fig. 1, the superconducting cable with a return path of the present embodiment includes: the inner support tube 100, the conductor layer 200, the shielding layer 300 and the outer protective layer 400 are arranged in sequence from inside to outside, and the inner support tube 100 is of a hollow structure;
two heat insulating layers are arranged between the shielding layer 300 and the outer protective layer 400, the two heat insulating layers are an inner heat insulating layer 500 and an outer heat insulating layer 600 respectively, and a space is arranged between the inner heat insulating layer 500 and the outer heat insulating layer 600.
The inner support pipe 100 is used for the inflow of the cooling medium, and the interval provided between the inner insulation layer 500 and the outer insulation layer 600 is used for the backflow of the cooling medium. That is, the interval provided between the inner heat insulating layer 500 and the outer heat insulating layer 600 serves as a return passage, and the return passage is provided such that heat is blocked by the inner heat insulating layer 500 during the return of the cooling medium absorbing heat, the heat is not conducted to the inside, and the heat at the end of the shielding layer 300 of the superconducting cable does not rise, so that an external refrigerant return pipe is not required outside the superconducting cable; in the invention, the return channel is integrated on the superconducting cable, so that the volume of the superconducting cable is reduced, the heat leakage level of the superconducting cable is reduced, and the operation efficiency of the superconducting cable is improved. In this embodiment, the cooling medium is liquid nitrogen.
The inner and outer insulating layers 500 and 600 are vacuum pipes each including an inner pipe portion 510 and 610 and an outer pipe portion 520 and 620 fitted around the outer portion 510 and 610 of the inner pipe portion, and a vacuum is drawn between the inner pipe portion 510 and 610 and the outer pipe portion 520 and 620. The vacuum pipe fitting has the advantages that heat conduction and heat convection are avoided in the vacuum pipe fitting, and the vacuum pipe fitting enables the inner heat insulation layer 500 and the outer heat insulation layer 600 to achieve a better heat insulation effect. The inner pipe portion 510 of the inner heat insulation layer 500, the outer pipe portion 520 of the inner heat insulation layer 500, the inner pipe portion 610 of the outer heat insulation layer 600, and the outer pipe portion 620 of the outer heat insulation layer 600 are provided in this order from the inside to the outside.
The outer walls of the inner pipe parts 510 and 610 of the vacuum pipe fitting and the inner walls of the outer pipe parts 520 and 620 of the vacuum pipe fitting are coated with radiation-proof films, and the black body radiation coefficient of the radiation-proof films is less than 0.5W/(m & lt/& gt)2·K4). This structure makes the vacuum pipe fitting can also prevent heat radiation, and this just can further promote the adiabatic effect of vacuum pipe fitting. In this embodiment, the radiation-proof film is made of an aluminum-plated film.
The inner support tube 100 is a flexible tube. This configuration facilitates bending of the inner support tube 100.
The flexible pipeline is of a corrugated pipe structure. The corrugated pipe has simple structure and is convenient to process.
In this embodiment, the conductor layer 200 includes three layers of conductors, namely an inner superconductor 210, an intermediate superconductor 220 and an outer superconductor 230, which are sequentially disposed from inside to outside.
Example 2
As shown in fig. 2, the present embodiment is different from embodiment 1 in that the inner heat insulating layer 500 has a single-layer structure, and the single-layer structure is made of a material having a thermal conductivity coefficient of less than 1W/(m · K). The single-layer structure is simple, and the structure of the superconducting cable can be more compact.
The monolayer structure is made of fluoroplastic.
In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. A superconducting cable with a return channel, comprising: the cable comprises an inner supporting tube (100), a conductor layer (200), a shielding layer (300) and an outer protective layer (400) which are arranged from inside to outside in sequence, wherein the inner supporting tube (100) is of a hollow structure; the method is characterized in that: shielding layer (300) with be equipped with two heat insulation layers between outer jacket (400), two the heat insulation layer is interior heat insulation layer (500) and outer heat insulation layer (600) respectively, interior heat insulation layer (500) with be provided with the interval between outer heat insulation layer (600).
2. A superconducting cable with a return path according to claim 1, characterized in that: interior heat insulating layer (500) with outer heat insulating layer (600) are the vacuum pipe fitting, the vacuum pipe fitting includes inner tube portion (510, 610) and cover and establishes outer tube portion (520, 620) of inner tube portion outside (510, 610), inner tube portion (510, 610) with evacuation between outer tube portion (520, 620).
3. A superconducting cable with a return path according to claim 2, characterized in that: the outer wall of inner tube portion (510, 610) of vacuum pipe fitting with the inner wall of outer tube portion (520, 620) of vacuum pipe fitting coats and is had the membrane of protecting against radiation, the black body radiation coefficient of membrane of protecting against radiation is less than 0.5W/(m)2·K4)。
4. A superconducting cable with a return path according to claim 3, characterized in that: the radiation-proof film is made of an aluminum-plated film.
5. A superconducting cable with a return path according to claim 1, characterized in that: the inner heat insulation layer (500) is of a single-layer structure, and the single-layer structure is made of a material with a thermal conductivity coefficient smaller than 1W/(m.K).
6. A superconducting cable with a return path according to claim 5, characterized in that: the single-layer structure is made of fluoroplastic.
7. A superconducting cable with a return path according to claim 1, characterized in that: the inner supporting pipe (100) is a flexible pipeline.
8. A superconducting cable with a return path according to claim 7, characterized in that: the flexible pipeline is of a corrugated pipe structure.
9. A superconducting cable with a return path according to claim 1, characterized in that: the inner support pipe (100) is used for cooling medium to flow in, and the interval arranged between the inner heat insulation layer (500) and the outer heat insulation layer (600) is used for cooling medium to flow back.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010021675.XA CN111128469A (en) | 2020-01-09 | 2020-01-09 | Superconducting cable with return current path |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010021675.XA CN111128469A (en) | 2020-01-09 | 2020-01-09 | Superconducting cable with return current path |
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| Publication Number | Publication Date |
|---|---|
| CN111128469A true CN111128469A (en) | 2020-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010021675.XA Pending CN111128469A (en) | 2020-01-09 | 2020-01-09 | Superconducting cable with return current path |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113506653A (en) * | 2021-07-02 | 2021-10-15 | 中天集团上海超导技术有限公司 | Compact superconducting cable and cable assembly with same |
| CN115020028A (en) * | 2022-07-15 | 2022-09-06 | 北京航空航天大学 | Superconducting cable with fluid oscillation structure for enhanced cooling |
-
2020
- 2020-01-09 CN CN202010021675.XA patent/CN111128469A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113506653A (en) * | 2021-07-02 | 2021-10-15 | 中天集团上海超导技术有限公司 | Compact superconducting cable and cable assembly with same |
| CN115020028A (en) * | 2022-07-15 | 2022-09-06 | 北京航空航天大学 | Superconducting cable with fluid oscillation structure for enhanced cooling |
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