Terminal structure for conduction cooling high temperature superconducting cable
The present application discloses a terminal structure for conduction cooling high temperature superconducting cable, comprising: a cable terminal body; a terminal thermal insulation shell, in which a vacuum thermal insulation cavity is formed, and the cable terminal body being arranged in the vacuum thermal insulation cavity; a refrigeration mechanism comprising a refrigeration output part extending into the vacuum thermal insulation cavity, and the refrigeration output part being connected to the cable terminal body through a cooling-conducting structure. The terminal structure provided by the present application cools the high-temperature superconducting cable by means of conduction cooling of a refrigerator without operations of low-temperature liquid transportation and supplementary, and can operate for a long time without regular maintenance, reduce the heat leakage of the cable terminal, improve the utilization efficiency of the cooling capacity of the refrigerator, and effectively ensure the stable operation of the cable for a long time.
1. A terminal structure for conduction cooling high temperature superconducting cable, comprising:
a cable terminal body;
a terminal thermal insulation shell, in which a vacuum thermal insulation cavity is formed, and the cable terminal body being arranged in the vacuum thermal insulation cavity; and
a refrigeration mechanism comprising a refrigeration output part extending into the vacuum thermal insulation cavity, and the refrigeration output part being connected to the cable terminal body through a cooling-conducting structure;
wherein:
the refrigeration mechanism comprises a refrigerator; the refrigeration output part is a cold head of the refrigerator, and the cooling-conducting structure is a cooling-conducting belt connected between the cold head of the refrigerator and the cable terminal body; and
the bottom of the terminal thermal insulation shell is provided with an installation sleeve for receiving and installing the cold head of the refrigerator; the cold head of the refrigerator is installed in the installation sleeve in a sealed manner, and extends into the vacuum thermal insulation cavity from the installation sleeve to be connected to the cooling-conducting belt.
2. The terminal structure for conduction cooling high temperature superconducting cable according to claim 1 , wherein:
the terminal thermal insulation shell is a multi-layer thermal insulation structure, and
the terminal thermal insulation shell at least comprises:
a metal shell layer arranged to be internally evacuated; and
a low temperature radiation protection layer, which is arranged in the metal shell layer and is suitable for separating the metal shell layer and the cable terminal body to reduce heat radiation.
3. The terminal structure for conduction cooling high temperature superconducting cable according to claim 2 , wherein the terminal thermal insulation shell comprises:
a low temperature radiation protection layer bracket, which is arranged between the low temperature radiation protection layer and the metal shell layer, and is suitable for supporting the low temperature radiation protection layer in the metal shell layer to set a spaced position.
4. The terminal structure for conduction cooling high temperature superconducting cable according to claim 3 , wherein the low temperature radiation protection layer bracket comprises:
one or more separation rings arranged between the metal shell layer and the low temperature radiation protection layer, and the separation rings are polyvinyl chloride plastic rings.
5. The terminal structure for conduction cooling high temperature superconducting cable according to claim 2 , wherein:
the metal shell layer is provided with a process hole for installing and debugging cables, and a process hole cover plate for opening or closing the process hole.
6. The terminal structure for conduction cooling high temperature superconducting cable according to claim 5 , wherein:
an avoidance opening is provided on the low temperature radiation protection layer at a position corresponding to the process hole; and
the low-temperature radiation protection layer includes an upper cover body radiation protection layer which is able to open or close the avoidance opening, and a handle is provided on the upper cover body radiation protection layer.
7. The terminal structure for conduction cooling high temperature superconducting cable according to claim 1 , wherein:
the terminal thermal insulation shell includes a cylindrical body, and a cable connection end and an electrical equipment connection end both disposed at both ends of the cylindrical body; and
a terminal cavity is formed in the cable connection end, the terminal structure further comprises a terminal bracket arranged in the terminal cavity, and the cable terminal body is installed in the terminal thermal insulation shell through the terminal bracket.
8. The terminal structure for conduction cooling high temperature superconducting cable according to claim 7 , wherein:
the cable connection end includes a uniform diameter section with a reduced inner diameter, and a variable diameter section connected between the uniform diameter section and the cylindrical body; and
the terminal bracket includes a cylindrical bracket body part and a conical bracket body part fitted with the uniform diameter section and the variable diameter section respectively, a plurality of support snap rings for supporting and fixing the cable terminal body are provided spaced apart in the terminal bracket along an axial direction of the terminal bracket.
9. The terminal structure for conduction cooling high temperature superconducting cable according to claim 7 , wherein: the cable terminal body includes a cable body and a cable joint; and the cooling-conducting structure is a cooling-conducting belt connected between the refrigeration output part and the cable joint and/or the cable body.
10. The terminal structure for conduction cooling high temperature superconducting cable according to claim 9 , wherein the electrical equipment connection end comprises:
a connecting plate detachably fixed on the end opening of the cylindrical body;
a terminal post, which is arranged on the connecting plate, and the terminal post comprises an inner terminal end located on an inner side of the connecting plate and an outer terminal end located on an outer side of the connecting plate; and
the inner terminal end is suitable for connecting to the cable joint, and the outer terminal end is suitable for connecting to electrical equipment.
11. The terminal structure for conduction cooling high temperature superconducting cable according to claim 10 , wherein:
the connecting plate is a metal plate;
a connecting plate radiation protection screen is arranged on the inner side of the connecting plate; and
the connecting plate radiation protection screen is blocked, in a sealed manner, between the vacuum thermal insulation cavity and the connecting plate.
12. The terminal structure for conduction cooling high temperature superconducting cable according to claim 9 , further comprising:
a cable body thermal insulation sleeve connected to the terminal thermal insulation shell in a sealed manner; and
a cable support, through which the cable body is supported and fixed in the cable body thermal insulation sleeve.