CN109686495B

CN109686495B - Modular assembling type superconducting cable cold sleeve structure

Info

Publication number: CN109686495B
Application number: CN201710973832.5A
Authority: CN
Inventors: 杨正南; 吴宏; 李育隆
Original assignee: Beihang University
Current assignee: Beihang University
Priority date: 2017-10-19
Filing date: 2017-10-19
Publication date: 2020-07-10
Anticipated expiration: 2037-10-19
Also published as: CN109686495A

Abstract

The invention relates to a modular assembling type superconducting cable cold sleeve structure which comprises a superconducting cable core, an insulating layer, an upper cold sleeve, a lower cold sleeve, a cooling medium, a vacuum layer and a heat-insulating layer. The upper cold sleeve and the lower cold sleeve are provided with buckles which are connected up and down, so that the quick assembly of the cold sleeve structure of the superconducting cable is realized. Meanwhile, both ends of the upper cooling sleeve and the lower cooling sleeve are provided with cooling medium inlets and outlets which can be quickly connected. The superconducting cable cold sleeve structure has the characteristics of modularization, convenience in assembly and disassembly.

Description

Modular assembling type superconducting cable cold sleeve structure

Technical Field

The invention relates to a modular assembling type superconducting cable cold sleeve structure.

Background

In order to achieve the purpose of high-efficiency and low-loss transmission of the high-temperature superconducting cable, a resistance-free superconducting material is adopted as a conductor. The superconducting cable can transmit large current and has the advantages of small volume, light weight and the like.

The high temperature superconducting cable has only 0.5% transmission loss, which is much less than that of the conventional cable. Compared with the conventional power cable, the high temperature superconducting cable has a greater current density, and the loss can be reduced by 60%. The high-temperature superconducting cable is used for transforming the existing underground cable system, so that the transmission capacity can be improved by more than 3 times, and the total cost can be reduced by 20%. The traditional power transmission mode, namely, the mode of transmitting electric energy by adopting low voltage and large current can be changed by applying the high-temperature superconducting cable. Therefore, the high-temperature superconducting cable can greatly reduce the loss of the power system in the power transmission process, improve the total efficiency of the power system and has considerable economic and environmental benefits.

However, the length of each superconducting cable is currently limited for reasons of production and transportation. Therefore, when a long-distance transmission line is laid, a plurality of superconducting cables need to be butted together at a construction site where the cables are laid. The traditional butt joint method needs welding, riveting and other processes. The superconducting cable has a complicated structure, and the cable core, the cooling medium circuit and other components are very weak. When connecting cables by using various existing processes, not only additional structures need to be added to connect the cable core and other external parts respectively, but also fragile structures such as the cable core and a cooling medium loop are damaged due to careless operation in construction.

In order to solve the above problems, the present invention provides a modular assembling type superconducting cable cold sleeve structure. This structure can simplify the installation and connection process of the superconducting cable.

Disclosure of Invention

The cold sleeve structure comprises a superconducting cable core, an insulating layer, an upper cold sleeve, a lower cold sleeve, a cooling medium, a vacuum layer and a heat insulating layer.

The upper cooling sleeve and the lower cooling sleeve form an outer wall by a vacuum layer and a heat insulation layer, the center is a cavity and is used for allowing a cooling medium to pass through, the upper cooling sleeve and the lower cooling sleeve are mutually independent and are matched together through a sliding groove, the quick assembly of the superconducting cable cooling sleeve structure is realized, and meanwhile, two ends of the upper cooling sleeve and the lower cooling sleeve are provided with connecting devices which can be used for conveniently connecting two adjacent cables.

The superconducting cable cold sleeve structure has the characteristics of modularization, convenience in assembly and disassembly.

Drawings

Fig. 1 is a schematic view of a construction of a cold jacket structure of a modular assemblable superconducting cable of the present invention;

FIG. 2 is a plan view of the chute for mounting the upper and lower cold collars of the present invention;

fig. 3 is a schematic view of the connection device at two ends of the cold jacket structure of the invention.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

As shown in fig. 1, the superconducting cable with the assemblable cold jacket structure includes: the superconducting cable comprises a cable core 1 of a superconducting cable, an insulating layer 2, an upper cooling sleeve 3, a lower cooling sleeve 4, a cooling medium 5, a vacuum layer 6 and a heat-insulating layer 7. The superconducting cable core 1 is centered and surrounded by an insulating layer 2. The upper cooling sleeve 3 and the lower cooling sleeve 4 are matched together through the sliding groove 8 to surround the cable core 1. And a cooling medium 5 is introduced into the cavities of the upper cooling sleeve 3 and the lower cooling sleeve 4, so that the temperature required by the normal work of the cable core can be ensured. The outer walls of the upper cooling sleeve 3 and the lower cooling sleeve 4 are composed of a vacuum layer 6 and a heat insulation layer 7, and the temperature of the cooling medium 5 is guaranteed.

As shown in fig. 2, a chute 8 between the upper cooling jacket 3 and the lower cooling jacket 4. The upper cooling sleeve 3 and the lower cooling sleeve 4 are independent of each other and are matched together through the sliding groove 8 during assembly, so that radial movement is limited.

As shown in fig. 3, the upper cold sleeve 3 and the lower cold sleeve 4 are provided with connecting means 9 at both ends. When connecting two cables, the edge of the connecting device 9 opposite to the two cables is clamped by the limiting stopper 10, and two grooves 11 are arranged on the connecting device 9 and used for adding sealing materials to prevent the cooling medium from being exposed at the connecting position. The end 12 of the stopper 10 is bolted.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A modular assembling type superconducting cable cold sleeve structure comprises a superconducting cable core, an insulating layer, an upper cold sleeve, a lower cold sleeve, a cooling medium, a vacuum layer and a heat-insulating layer, and is characterized in that the upper cold sleeve and the lower cold sleeve form an outer wall through the vacuum layer and the heat-insulating layer, a cavity is formed in the center, in order to achieve the heat-insulating function, the diameter of the upper cold sleeve and the diameter of the lower cold sleeve wrapping the heat-insulating layer have a minimum value d of 3.5 lambda/α, wherein lambda is the heat conductivity coefficient of a material of the heat-insulating layer, α is the convection heat transfer coefficient of the outer wall of the heat-insulating layer and ambient air, the upper cold sleeve and the lower cold sleeve are mutually independent, sliding grooves are formed in matching surfaces of the upper cold sleeve and the lower cold sleeve, groove-shaped structures are arranged at two ends of the upper cold sleeve and the lower cold sleeve, and after the upper cold sleeve and the lower cold sleeve of adjacent cables are correspondingly connected, the groove-shaped structures of a limiting device are clamped, and the modularization and the rapid assembling and disassembling are achieved.