Cable insulation structure and manufacturing method

Abstract

The present invention discloses a cable insulation structure and a manufacturing method, which belongs to the field of superconducting cable technology. The cable insulation structure includes: a cable installation body, an inner cylinder assembly and an outer cylinder; a cable is inserted into the cable installation body; the inner cylinder assembly is sleeved outside the cable installation body, and a first insulation cavity is formed between the inner cylinder assembly and the cable installation body; the outer cylinder is sleeved outside the inner cylinder assembly, and a vacuum insulation cavity is formed between the outer cylinder and the inner cylinder assembly. The temperature zones corresponding to the cable installation body, the inner cylinder assembly and the outer cylinder increase in sequence. According to the cable insulation structure of the embodiment of the present invention, the environment in which the cable is located is divided into the temperature of the cable itself, the temperature of the inner cylinder assembly and the temperature outside the outer cylinder, that is, divided into three temperature zones, thereby reducing heat conduction and heat radiation, thereby achieving a better insulation effect on the cable.

Description

Technical Field

[0001] The present invention relates to the technical field of superconducting cables, and in particular to a cable thermal insulation structure and a manufacturing method thereof. Background Art

[0002] The current transmission line is a key component in a nuclear fusion device. As the lifeline of the magnetic system of the nuclear fusion device, it provides power to the magnets and transmits cold mass to control its own temperature to ensure a stable power supply. At the same time, it serves as a discharge channel for the magnet's stored energy in a fault state, ensuring the timely and safe discharge of the magnet's energy.

[0003] Among the current transmission lines, the power lines that supply power to the magnets are superconducting cables. Taking NbTi superconducting cables as an example, NbTi superconducting cables are cables made of niobium-titanium alloy as the superconducting material. Their Tc temperature (superconducting transition temperature) is around 8K, and they must maintain a superconducting state at extremely low temperatures. A superlow temperature environment of 4.5K is required for the superconducting cables to ensure stable operation of the magnet system. However, the temperature of current superconducting cables is easily affected by the indoor temperature and their thermal insulation is poor. Summary of the Invention

[0004] The present invention aims to address at least one of the technical problems existing in the prior art. To this end, the present invention proposes a cable insulation structure that includes the temperature of the cable itself, the temperature of the inner barrel assembly, and the temperature outside the outer barrel, that is, three temperature zones. This reduces heat conduction and heat radiation, thereby achieving better insulation for the cable.

[0005] According to an embodiment of the present invention, the cable insulation structure includes: a cable installation body, an inner cylinder assembly and an outer cylinder body; a cable is inserted into the cable installation body; the inner cylinder assembly is sleeved outside the cable installation body, and a first insulation cavity is formed between the inner cylinder assembly and the cable installation body; the outer cylinder body is sleeved outside the inner cylinder assembly, and a vacuum insulation cavity is formed between the outer cylinder body and the inner cylinder assembly, and the temperature zones corresponding to the cable installation body, the inner cylinder assembly and the outer cylinder body increase in sequence.

[0006] According to the cable insulation structure of the embodiment of the present invention, the cable insulation structure includes the temperature of the cable itself, the temperature of the inner cylinder assembly, and the temperature outside the outer cylinder, that is, it is divided into three temperature zones, which can more effectively reduce the temperature impact of the thermal radiation of the indoor temperature on the cable inside the inner cylinder assembly. At the same time, the vacuum insulation cavity also slows down the heat conduction and heat convection of the indoor temperature on the cable in the inner cylinder assembly, thereby improving the insulation effect of the cable.

[0007] According to the cable insulation structure of an embodiment of the present invention, the cable installation body includes a support body and a support leg, the support body is installed with the cable, one end of the support leg is connected to the support body, and the other end is connected to the inner wall of the inner barrel assembly.

[0008] According to the cable insulation structure of the embodiment of the present invention, a heat insulation pad is provided between the support body and the support legs.

[0009] According to the cable insulation structure of the embodiment of the present invention, the support body is provided with a heat insulation ring, and the cable is passed through the heat insulation ring to be supported by the cable installation body.

[0010] According to the cable insulation structure of the embodiment of the present invention, the inner cylinder assembly includes an inner cylinder body and a cooling member. The cooling member is provided on the outer peripheral wall of the inner cylinder body, and a cooling medium is provided in the cooling member.

[0011] According to the cable insulation structure of the embodiment of the present invention, the inner barrel assembly further includes a heat insulating layer, and the heat insulating layer is provided outside the cooling member.

[0012] According to the cable insulation structure of an embodiment of the present invention, the insulation layer includes at least multiple layers of composite insulation layers, each of the composite insulation layers includes an insulation sublayer and a reflection sublayer, the multiple layers of composite insulation layers are distributed radially from the inner cylinder body to the outer cylinder body, and the reflection sublayer includes a reflection surface, which faces the outer cylinder body.

[0013] According to the cable insulation structure of an embodiment of the present invention, the insulation layer further includes a first insulation layer, a second insulation layer and a fastening layer. The first insulation layer and the second insulation layer are respectively located on both sides of the multi-layer composite insulation layer. The thermal conductivity of the first insulation layer and the second insulation layer is lower than that of the composite insulation layer. The first insulation layer is connected to the inner cylinder body and the second insulation layer faces the outer cylinder body. The fastening layer is provided on the outside of the second insulation layer.

[0014] According to the cable insulation structure of an embodiment of the present invention, a first support structure is further provided between the inner cylinder assembly and the outer cylinder body, the first support structure includes a first support portion, a second support portion and a first thermal insulation board, the first support portion is connected to the inner cylinder assembly and the second support portion is connected to the outer cylinder body, and the first thermal insulation board is connected between the first support portion and the second support portion.

[0015] According to the cable insulation structure of an embodiment of the present invention, the first support part, the second support part and the first insulation board are connected by a connecting component, and the part of the connecting component that penetrates the first support part, the second support part and the first insulation board is provided with an insulating sleeve.

[0016] According to the cable insulation structure of the embodiment of the present invention, the first heat insulation board has multiple contact surfaces with the first support portion, and multiple contact surfaces with the second support portion.

[0017] According to an embodiment of the present invention, the cable insulation structure further includes a gravity support structure, which includes a first connecting part, a second connecting part and a supporting part distributed along the upper and lower parts, the first connecting part is connected to the inner cylinder assembly, the second connecting part is connected to the outer cylinder body, and a second insulation board is provided between the first connecting part and the second connecting part.

[0018] According to the cable insulation structure of the embodiment of the present invention, the second thermal insulation board has multiple contact surfaces with the first connecting portion, and the second thermal insulation board has multiple contact surfaces with the second connecting portion.

[0019] According to the cable insulation structure of an embodiment of the present invention, the outer cylinder includes a plurality of first cylinder segments and a plurality of second cylinder segments arranged along the axial direction, the plurality of first cylinder segments are spaced apart along the axial direction, and the bottom of each first cylinder segment is connected to the gravity support structure, and a second cylinder segment is connected between adjacent first cylinder segments, and the second cylinder segment is formed by splicing two semi-arc cylinder segments.

[0020] According to the cable insulation structure of an embodiment of the present invention, the outer cylinder is further provided with a vacuum extraction port and a vacuum gauge, the vacuum gauge measures the vacuum degree of the vacuum insulation cavity, and the vacuum extraction port is used for vacuuming.

[0021] An embodiment of the present invention also proposes a method for manufacturing a cable insulation structure. The manufacturing of the above-mentioned cable insulation structure includes the following steps: passing the cable through a cable installation body; installing the cable installation body with the cable passed through in an inner tube assembly; and connecting the outer tube body to the outer periphery of the inner tube assembly to form a vacuum insulation cavity.

[0022] The manufacturing method of the cable insulation structure can more effectively prevent the thermal radiation of the indoor temperature from affecting the temperature of the cable inside the inner barrel assembly. At the same time, the vacuum insulation cavity slows down the heat conduction and heat convection of the indoor temperature to the cable inside the inner barrel assembly, thereby improving the insulation effect of the cable.

[0023] According to the manufacturing method of the cable insulation structure of an embodiment of the present invention, after the cable installation body provided with a cable is installed on the inner wall of the inner cylinder assembly, the method further includes: setting a first support portion of the first support structure on the outer wall of the inner cylinder assembly, and setting a second support portion of the first support structure on the inner wall of the outer cylinder body.

[0024] According to the manufacturing method of the cable insulation structure of an embodiment of the present invention, the outer cylinder is connected to the outer periphery of the inner cylinder assembly to form a vacuum insulation chamber, including: installing the inner cylinder assembly into multiple axially distributed first cylinder segments of the outer cylinder; connecting the first support part of the inner cylinder assembly with the second support part of the first cylinder segment; and connecting the second cylinder segment between adjacent first cylinder segments.

[0025] According to the manufacturing method of the cable insulation structure of an embodiment of the present invention, before connecting the second barrel segment between adjacent first barrel segments, it also includes: connecting the gravity support structure to the outer wall of the first barrel segment, and then connecting the gravity support structure to the outer wall of the inner barrel assembly.

[0026] According to the manufacturing method of the cable insulation structure of an embodiment of the present invention, before connecting the outer cylinder to the outer periphery of the inner cylinder assembly to form a vacuum insulation cavity, it also includes: connecting a cooling part to the outer periphery of the inner cylinder body; pickling and passivating the surface of the inner cylinder body, and cleaning and baking it; baking the insulation layer and connecting it to the outside of the cooling part.

[0027] According to the manufacturing method of the cable insulation structure of the embodiment of the present invention, after baking the insulation layer and connecting it to the outside of the cooling member, the method includes: piercing a plurality of vacuum holes in the insulation layer.

[0028] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0030] Figure 1 1 is a schematic cross-sectional view of a cable insulation structure according to an embodiment of the present invention;

[0031] Figure 2 is a schematic diagram of a first supporting structure of a cable thermal insulation structure according to an embodiment of the present invention;

[0032] Figure 3 is a schematic diagram of a gravity support structure of a cable insulation structure according to an embodiment of the present invention;

[0033] Figure 4 This is a partial exploded schematic diagram of the connection between the outer cylinder and the inner cylinder assembly of the cable insulation structure according to an embodiment of the present invention;

[0034] Figure 5 This is a schematic structural diagram of the connection between the outer cylinder and the inner cylinder assembly of the cylinder assembly of the cable insulation structure according to an embodiment of the present invention;

[0035] Figure 6 1 is a schematic structural diagram of a heat-insulating layer according to an embodiment of the present invention;

[0036] Figure 7 It is a flow chart of the installation steps of the cable insulation structure according to an embodiment of the present invention.

[0037] Reference numerals:

[0038] Cable insulation structure 100,

[0039] Inner cylinder assembly 1, inner cylinder body 11, cooling element 12, insulation layer 13, composite insulation layer 131, reflective sublayer 1311, insulation sublayer 1312, second insulation layer 132, fastening layer 133, first insulation layer 134, first insulation cavity 14, outer cylinder 2, first cylinder section 21, second cylinder section 22, vacuum port 221, vacuum valve 222, vacuum gauge 223, vacuum insulation cavity 3, first support structure 4, first support portion 41, first lateral support section 411, first vertical support section 412, second support portion 42, second lateral support section 421 , first connecting groove 422, first thermal insulation board 43, first section 431, second section 432, third section 433, connecting assembly 44, connecting rod 441, nut 442, thermal insulation sleeve 45, cable mounting body 5, support body 51, support foot 52, thermal insulation pad 53, thermal insulation ring 54, cable 6, gravity support structure 7, first connecting part 71, second connecting groove 711, second connecting part 72, second connecting protrusion 721, second thermal insulation board 73, second transverse section 731, vertical section 732, first transverse section 733, support part 74, connecting bolt 75. DETAILED DESCRIPTION

[0040] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0042] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0043] Reference below Figures 1-6 The cable insulation structure 100 according to an embodiment of the present invention is described. The cable insulation structure 100 is divided into the temperature of the cable 6 itself, the temperature of the inner cylinder assembly 1, and the temperature outside the outer cylinder 2, that is, it is divided into three temperature zones. The vacuum insulation cavity 3 also slows down the heat conduction and heat convection of the indoor temperature to the cable 6 in the inner cylinder assembly 1. The heat conduction and heat radiation are reduced by setting the three temperature zones and the vacuum insulation cavity 3, thereby achieving a better insulation effect.

[0044] like Figure 1-6 As shown, a cable thermal insulation structure 100 according to an embodiment of the present invention includes: a cable installation body 5 , an inner cylinder assembly 1 and an outer cylinder 2 .

[0045] Among them, a cable 6 is passed through the cable installation body 5; the inner cylinder assembly 1 is sleeved on the outside of the cable installation body 5, and a first insulation cavity 14 is formed between the inner cylinder assembly 1 and the cable installation body 5; the outer cylinder body 2 is sleeved on the outside of the inner cylinder assembly 1, and a vacuum insulation cavity 3 is formed between the outer cylinder body 2 and the inner cylinder assembly 1. The temperature zones corresponding to the cable installation body 5, the inner cylinder assembly 1 and the outer cylinder body 2 increase successively.

[0046] In practice, cable 6 is a superconducting cable. Superconducting cables utilize superconducting materials that enter a superconducting state at a critical temperature. At this point, resistance disappears, allowing current to be transmitted without loss. This property enables superconducting cables to carry extremely high currents, with a transmission capacity far exceeding that of traditional cables. For example, a 35 kV superconducting cable can transmit the same amount of power as a 220 kV cable with extremely low line losses. Superconducting cables are commonly used in high-power transmission scenarios, such as power transmission and the construction of large-scale power networks, significantly improving power transmission efficiency and reliability.

[0047] Specifically, the cable installation body 5 can be used to install the superconducting cable. After the superconducting cable passes through multiple cable installation bodies 5, the cable installation bodies 5 can be pushed into the interior of the inner tube assembly 1 in sequence. The specific pushing method can be carried out by selecting specific tooling according to actual conditions, or by driving parts such as cylinders. Multiple cable installation bodies 5 are distributed at intervals along the inner wall of the inner tube assembly 1, so that the cable installation bodies 5 can stably support the superconducting cable.

[0048] In addition, a gap is provided inside the superconducting cable, which can be filled with helium. For example, liquid helium at 4.5K is used for cooling. The temperature of 4.5K is equivalent to -268.35 degrees Celsius. K is the unit of thermodynamic temperature, also known as the Kelvin scale or the absolute temperature scale. That is, the temperature of the superconducting cable is in the first temperature zone at this time. The first insulation cavity 14 between the inner cylinder assembly 1 and the cable installation body 5 and the outer wall of the inner cylinder assembly 1 can serve as the second temperature zone. The outer cylinder body 2 is sheathed outside the inner cylinder assembly 1, and the area outside the outer cylinder body 2 is the third temperature zone. The third temperature zone can be understood as the indoor temperature, that is, the cable installation body 5 is not in direct contact with the outer cylinder body 2. At the same time, after the inner cylinder assembly 1 is installed in the outer cylinder body 2, a cavity can be formed between the inner cylinder assembly 1 and the outer cylinder body 2, and the cavity is evacuated to form a vacuum insulation cavity 3. The vacuum insulation cavity 3 can reduce the heat conduction and heat convection between the superconducting cable in the indoor temperature area and the low-temperature working area. That is, through the three temperature zones combined with the setting of the vacuum insulation cavity 3, the temperature stability of the superconducting cable is improved, and the working efficiency of the superconducting cable is improved.

[0049] In some embodiments, the cable mounting body 5 includes a supporting body 51 and a supporting leg 52 . The supporting body 51 is mounted with the cable 6 . One end of the supporting leg 52 is connected to the supporting body 51 , and the other end is connected to the inner wall of the inner barrel assembly 1 .

[0050] Reference Figure 1 As shown, multiple support legs 52 can be provided around the support body 51, such as four support legs 52. These four support legs 52 can be supported on the inner circumferential wall of the inner barrel assembly 1, thereby maintaining the stability of the support body 51. The support body 51 is constructed in a square shape, and each side of the square of the support body 51 has a position for installing a cable 6, thereby allowing a single support body 51 to accommodate multiple superconducting cables. Furthermore, the contact surface between the support legs 52 and the inner wall of the inner barrel assembly 1 is curved and in a compressive contact, thereby facilitating the insertion of the cable mounting body 5 into the inner barrel assembly 1.

[0051] In some embodiments, a thermal insulation pad 53 is provided between the support body 51 and the support legs 52. The thermal insulation pad 53 can be bonded between the support body 51 and the support legs 52, or connected between the support body 51 and the support legs 52 via a connector. For example, the support legs 52 are located at the four corners of the square support body 51 and extend toward the inner wall of the inner barrel assembly 1. The position of the cable 6 on the support body 51 can be set on both sides of the support legs 52 and close to the support legs 52. The thermal insulation pad 53 is provided at the position of the support legs 52, which reduces the heat conduction from the inner barrel assembly 1 to the superconducting cable, further improving the thermal insulation effect of the superconducting cable.

[0052] In some embodiments, the support body 51 is provided with a heat-insulating ring 54 , and the cable 6 is passed through the heat-insulating ring 54 to be supported on the cable mounting body 5 .

[0053] In practice, refer to Figure 1 As shown, a thermal insulation ring 54 is provided on the periphery of each guide cable. The thermal insulation ring 54 can be a G10 thermal insulation ring 54. The G10 thermal insulation ring 54 is a composite material synthesized by glass fiber cloth and epoxy resin. When the superconducting cable passes through the thermal insulation ring 54 of the cable installation body 5, the thermal insulation ring 54 can further insulate the cable installation body 5 from the superconducting cable, thereby reducing the heat transfer between the superconducting cable and the cable installation body 5.

[0054] In some embodiments, the inner cylinder assembly 1 includes an inner cylinder body 11 and a cooling element 12 . The cooling element 12 is disposed on the outer peripheral wall of the inner cylinder body 11 , and a cooling medium is disposed in the cooling element 12 .

[0055] The cooling element 12 is a cooling tube. Multiple cooling tubes can be welded to the outer periphery of the inner cylinder body 11, spaced equidistantly along the outer periphery of the inner cylinder body 11. Each cooling tube is filled with supercritical liquid helium at a temperature of 50K, thereby maintaining the inner cylinder body 11 within the 50K temperature range. The main benefits of liquid helium cooling include extremely low temperatures, excellent thermal conductivity, chemical stability, and wide application in various fields. Liquid helium cooling provides a low-temperature environment for the superconducting cable. When thermal radiation from the indoor environment is not completely isolated and some heat radiation reaches the outer periphery of the inner cylinder assembly 1, the cooling tubes can absorb heat radiation from the room temperature range, thereby reducing the temperature of the inner cylinder body 11. The indoor temperature range is 300K, the cooling element 12 is in the 50K temperature range, and the superconducting cable is in the 4.5K temperature range. Therefore, the provision of the cooling element 12 can reduce the thermal load on the superconducting cable.

[0056] Moreover, multiple cooling tubes are evenly spaced around the outer periphery of the inner cylinder body 11, and can absorb heat more evenly at the outer periphery of the inner cylinder assembly 1, thereby reducing the possibility of heat being transferred to the cable installation body 5, that is, reducing the possibility of heat being transferred to the superconducting cable.

[0057] In some embodiments, the inner barrel assembly 1 further includes a heat insulating layer 13 , which is disposed outside the cooling member 12 .

[0058] Among them, the insulation layer 13 can reduce the heat radiation of the room temperature zone to the superconducting cable, that is, the insulation layer 13 can isolate the heat transfer between the indoor environment and the environment where the superconducting cable is located to a certain extent, and the aforementioned cooling member 12 can achieve a cooling effect when some heat radiation is not fully isolated. Therefore, through the combination of the insulation layer 13 and the cooling member 12, the heat transfer between the indoor environment and the environment where the superconducting cable is located can be reduced, and the temperature stability of the superconducting cable can be maintained.

[0059] In some embodiments, the insulation layer 13 includes at least multiple layers of composite insulation layers 131, each layer of composite insulation layer 131 includes an insulation sublayer 1312 and a reflection sublayer 1311, and the multiple layers of composite insulation layers 131 are distributed radially from the inner cylinder body 11 to the outer cylinder body 2, and the reflection sublayer 1311 includes a reflection surface, which faces the outer cylinder body 2.

[0060] Reference Figure 6 As shown, the multi-layer composite insulation layer 131 is located in the middle area of ​​the entire insulation layer 13. Each composite insulation layer 131 includes an insulation sublayer 1312 and a reflective sublayer 1311. The insulation sublayer 1312 can be glass fiber paper or plant fiber paper, and the reflective sublayer 1311 can be aluminum paper or PET aluminized film. PET aluminized film is a composite material formed by depositing a thin layer of aluminum on the surface of a PET film through a vacuum aluminizing process. The PET material is polyethylene terephthalate, which is a milky white or light yellow highly crystalline polymer.

[0061] Specifically, the composite insulation layer 131 can be set to 30-40 layers. By setting the composite insulation layer 131, the insulation effect can be achieved. When the indoor hot air is transferred toward the inner tube assembly 1, the reflective sublayer 1311 can reflect the heat radiation from the indoor temperature zone to the inner tube assembly 1, that is, the heat transfer of indoor heat toward the inner tube assembly 1 is reduced. The heat radiation can be reduced by the reflective sublayer 1311, and the insulation sublayer 1312 can isolate more heat, that is, part of the uninsulated heat can be reflected by the reflective sublayer 1311 and reduced, thereby improving the thermal insulation effect of the superconducting cable.

[0062] In some embodiments, the insulation layer 13 also includes a first insulation layer 134, a second insulation layer 132 and a fastening layer 133. The first insulation layer 134 and the second insulation layer 132 are respectively located on both sides of the multi-layer composite insulation layer 131. The thermal conductivity of the first insulation layer 134 and the second insulation layer 132 is lower than that of the composite insulation layer 131. The first insulation layer 134 is connected to the inner cylinder body 11 and the second insulation layer 132 faces the outer cylinder body 2. A fastening layer 133 is provided on the outside of the second insulation layer 132.

[0063] In practice, continue to refer to Figure 6As shown, the first insulation layer 134 and the second insulation layer 132 are located on either side of the multi-layer composite insulation layer 131. The first insulation layer 134 can be configured as 3-8 layers of glass fiber paper or plant fiber paper, while the second insulation layer 132 can be configured as 5-10 layers of glass fiber paper. Due to the relatively high thermal conductivity of the reflective sublayer 1311, omitting the reflective sublayer 1311 from the first insulation layer 134 can reduce its heat conduction to the inner cylinder body 11. However, aluminum foil or aluminized film used for the reflective sublayer 1311 are not heat-resistant. Therefore, the portion of the multi-layer composite insulation layer 131 near the outer cylinder 2 is constructed with 5-10 layers of glass fiber. This means that the glass fiber has a higher heat resistance than the reflective layer, thus preventing the impact of high temperatures on the insulation layer 13 during subsequent welding to the outer cylinder 2. The fastening layer 133 can be constructed of glass fiber cloth, which secures the second insulation layer 132 and improves the reliability of the entire insulation layer 13.

[0064] In some embodiments, a first support structure 4 is further provided between the inner cylinder assembly 1 and the outer cylinder body 2. The first support structure 4 includes a first support portion 41, a second support portion 42 and a first thermal insulation board 43. The first support portion 41 is connected to the inner cylinder assembly 1 and the second support portion 42 is connected to the outer cylinder body 2. The first thermal insulation board 43 is connected between the first support portion 41 and the second support portion 42.

[0065] In practice, multiple first support structures 4 can be provided between the outer periphery of the inner cylinder assembly 1 and the outer cylinder body 2, with the multiple first support structures 4 being equidistantly distributed around the circumference to provide support between the inner cylinder assembly 1 and the outer cylinder body 2, thereby forming a stable vacuum insulation chamber 3. It should be noted that before providing the insulation layer 13, the first support portion 41 is connected to the exterior of the inner cylinder body 11, for example, by welding the first support portion 41 to the exterior of the inner cylinder body 11, and then the insulation layer 13 is provided.

[0066] Specifically, the first support portion 41 is welded to the outer periphery of the inner cylinder body 11 and the second support portion 42 is welded to the inner wall of the outer cylinder body 2, and a first thermal insulation board 43 is connected between the first support portion 41 and the second support portion 42. The first thermal insulation board 43 can reduce heat transfer between the inner cylinder body 11 and the outer cylinder body 2, that is, reduce the influence of indoor temperature on the superconducting cable inside the inner cylinder body 11, and maintain the normal working environment of the superconducting cable.

[0067] In some embodiments, the first support portion 41 , the second support portion 42 and the first insulation board 43 are connected by a connecting component 44 , and the portion of the connecting component 44 that penetrates the first support portion 41 , the second support portion 42 and the first insulation board 43 is provided with an insulation sleeve 45 .

[0068] Combine Figure 2As shown, the connecting assembly 44 includes a connecting rod 441 and a nut 442. The end of the connecting rod 441 is provided with a thread. The connecting rod 441 passes through the first support part 41, the first heat insulation plate 43 and the second support part 42 at the same time. The end of the connecting rod 441 is locked and connected by the nut 442, and the connecting rod 441 is further provided with an insulating sleeve 45 at the part where the first support part 41, the second support part 42 and the first heat insulation plate 43 are passed through. The insulating sleeve 45 can reduce the heat transfer between the first support part 41 and the second support part 42, and can also reduce the heat transfer between the connecting rod 441 and the first support part 41, and the second support part 42, thereby reducing the heat transfer between the inner cylinder body 11 and the outer cylinder body 2.

[0069] In some embodiments, the first heat insulation board 43 has multiple contact surfaces with the first support portion 41 and multiple contact surfaces with the second support portion 42 .

[0070] Continue to refer to Figure 2 As shown, the first support portion 41 includes a first transverse support section 411 and a first vertical support section 412. The first vertical support section 412 is perpendicular to the first transverse support section 411, and the first vertical support section 412 is provided in the middle area of ​​the first transverse support section 411 to reserve space for installing the first heat insulation board 43 at the end of the first transverse support section 411. The first heat insulation board 43 includes a third section 433 and two second sections 432 bent and connected at both ends of the third section 433. The two second sections 432 are respectively perpendicular to the third section 433 and parallel to each other. The first section 431 is perpendicular to the second section 432, and the first section 431, the second section 432 and the third section 433 are integrally formed. The first section 431 of the first heat insulation board 43 is in contact with the first vertical support section 412, and the two second sections 432 are in contact with both sides of the first transverse support section 411. The third section 433 is in contact with the end of the first transverse support section 411.

[0071] The second support portion 42 includes a second transverse support section 421 and a first connecting groove 422 provided at one end of the second transverse support section 421. The side of the first heat insulation plate 43 facing the outer cylinder 2 is at least partially located in the first connecting groove 422, and the side facing the inner cylinder assembly 1 is in contact with the first transverse support section 411 and the first vertical support section 412 respectively, that is, there are multiple surfaces on one side of the first heat insulation plate 43 in contact with the first support portion 41, and there are multiple surfaces on the other side of the first heat insulation plate 43 in contact with the second support portion 42, which can ensure the connection reliability of the first heat insulation plate 43 and the first support portion 41 and the second support portion 42, and at the same time isolate all contact surfaces between the first support portion 41 and the second support portion 42, thereby improving the first heat insulation plate 43's blocking effect on heat transfer between the first support portion 41 and the second support portion 42, thereby reducing heat transfer between the inner cylinder assembly 1 and the outer cylinder 2.

[0072] In some embodiments, the cable insulation structure 100 also includes a gravity support structure 7, which includes a first connection part 71, a second connection part 72 and a support part 74 distributed along the upper and lower parts. The first connection part 71 is connected to the inner cylinder assembly 1, and the second connection part 72 is connected to the outer cylinder body 2. A second insulation board 73 is provided between the first connection part 71 and the second connection part 72.

[0073] Combine Figure 1 and Figure 3 As shown, the gravity support structure 7 includes a first connecting portion 71 and a second connecting portion 72 spaced apart vertically. Both the first connecting portion 71 and the second connecting portion 72 are arcuate. The first connecting portion 71 is connected to the outer wall of the inner cylinder body 11, and the second connecting portion 72 is connected to the outer wall of the outer cylinder body 2. A support portion 74 is connected to the bottom of the second connecting portion 72, which supports the first connecting portion 71 and the second connecting portion 72. The arcuate first connecting portion 71 and the second connecting portion 72 can respectively adapt to the outer circumferential shapes of the inner cylinder body 11 and the outer cylinder body 2, thereby supporting the inner cylinder body 11 and the outer cylinder body 2 through the gravity support structure 7. In addition, a second thermal insulation board 73 between the first connecting portion 71 and the second connecting portion 72 can reduce heat transfer between the inner cylinder body 11 and the outer cylinder body 2 along the gravity support structure 7, thereby reducing the impact of outdoor temperature on the temperature of the superconducting cable.

[0074] In some embodiments, the second heat insulation board 73 has multiple contact surfaces with the first connection portion 71 , and the second heat insulation board 73 has multiple contact surfaces with the second connection portion 72 .

[0075] Specifically, a second connecting groove 711 is provided at one end of the first connecting portion 71, and a second connecting protrusion 721 is provided at one end of the second connecting portion 72. The second heat insulation plate 73 includes a first transverse section 733 and vertical sections 732 bent and connected at both ends of the first transverse section 733, and the two vertical sections 732 are connected to the second transverse section 731 at one end away from each other. The first transverse section 733 and the two vertical sections 732 of the second heat insulation plate 73 are located in the second connecting groove 711 of the first connecting portion 71, and the second transverse section 731 is located at the end of the second connecting groove 711 close to the second connecting portion 72. The second connecting protrusion 721 of the second connecting portion 72 extends between the two vertical sections 732 of the second heat insulation plate 73, and the second connecting protrusion 721 presses the second heat insulation plate 73 into the second connecting groove 711, and the second connecting protrusion 721, the second connecting groove 711 and the second heat insulation plate 73 are connected and fixed by connecting bolts 75.

[0076] That is to say, the second heat insulation plate 73 has multiple contact surfaces with the first connection part 71, and the second heat insulation plate 73 has multiple contact surfaces with the second connection part 72. This can not only improve the connection reliability between the second heat insulation plate 73 and the first connection part 71 and the second connection part 72, but also insulate all contact surfaces, thereby improving the heat insulation effect on the first connection part 71 and the second connection part 72.

[0077] In some embodiments, the outer cylinder 2 includes a plurality of first cylinder segments 21 and second cylinder segments 22 arranged along the axial direction, the plurality of first cylinder segments 21 are spaced apart along the axial direction, and the bottom of each first cylinder segment 21 is connected to a gravity support structure 7, and the second cylinder segment 22 is connected between adjacent first cylinder segments 21, and the second cylinder segment 22 is formed by splicing two semi-arc cylinder segments.

[0078] Combine Figure 4 and Figure 5 As shown, a plurality of first cylinder segments 21 are provided, and the plurality of first cylinder segments 21 are distributed at intervals along the axial direction. First, the inner cylinder assembly 1 is extended into the interior of the plurality of first cylinder segments 21. At this time, the first support structure 4 between the inner cylinder assembly 1 and the outer cylinder 2 can be connected, and the first connection portion 71 of the gravity support structure 7 is also connected to the inner cylinder body 11, and then the second connection portion 72 of the gravity support structure 7 is connected to the outer cylinder 2, so as to realize the support of the inner cylinder body 11 and the outer cylinder 2 by the gravity support structure 7.

[0079] The first support portion 41 and the second support portion 42 are connected through a connecting assembly 44, and the first support structure 4 and the gravity support structure 7 are staggered in the circumferential direction, and the outer cylinder 2 is arranged as a plurality of spaced-apart first cylinder segments 21. After the inner cylinder body 11 extends into the plurality of spaced-apart first cylinder segments 21, it is convenient to connect the gravity support structure 7 with the inner cylinder body 11 and the outer cylinder 2, and it is also convenient to connect the first support portion 41 and the second support portion 42.

[0080] After the gravity support structure 7 is connected to the inner cylinder body 11 and the outer cylinder body 2, and the first support structure 4 is connected to the inner cylinder body 11 and the outer cylinder body 2, the second cylinder section 22 is connected to the two adjacent first cylinder sections 21. The second cylinder section 22 is formed by splicing two semi-arc cylinder sections, which is convenient for connecting the second cylinder section 22 to the inner cylinder body 11 and the second cylinder section 22 to the first cylinder section 21. At this time, the outer cylinder 2 can be surrounded by the outer periphery of the inner cylinder body 11 as a whole, forming a vacuum insulation cavity 3, thereby reducing heat transfer and achieving the insulation effect of the inner cylinder body 11.

[0081] In some embodiments, the outer cylinder 2 is further provided with a vacuum port 221 and a vacuum gauge 223 . The vacuum gauge 223 measures the vacuum degree of the vacuum insulation cavity 3 , and the vacuum port 221 is used for vacuuming.

[0082] In practice, refer to Figure 4 As shown, the outer cylinder 2 is provided with a vacuum port 221, which is provided with a vacuum valve 222. A vacuum gauge 223 is also provided on one side of the vacuum port 221. This allows for evacuation and vacuum level monitoring of the vacuum insulation chamber 3 formed between the outer cylinder 2 and the inner cylinder body 11. For example, if the vacuum level cannot be achieved within 24 hours and remains at 0.1 Pa after 24 hours, heating and nitrogen replacement are performed at 80°C for 4-6 hours before further evacuation. Once the required vacuum level is met, the vacuum valve 222 is closed. Since the insulation layer 13 may adsorb large, difficult-to-extract gases such as water molecules and oil, heating and nitrogen replacement can expel these gases. By monitoring the vacuum level with the vacuum gauge 223, the vacuum insulation chamber 3 formed between the outer cylinder 2 and the inner cylinder assembly 1 is maintained in a vacuum state as much as possible, thereby reducing heat conduction and convection from the room temperature region to the superconducting cable in the low-temperature operating region.

[0083] The embodiment of the present invention also discloses a method for manufacturing a cable insulation structure, such as Figure 7 As shown, manufacturing the above-mentioned cable insulation structure 100 includes the following steps:

[0084] S1: Pass the cable 6 through the cable installation body 5; that is, first pass the superconducting cable through multiple cable installation bodies 5. For example, the cable installation body 5 is provided with multiple insulation rings 54, and the insulation rings 54 are provided with penetration holes. The superconducting cable passes through the penetration holes of the multiple cable installation bodies 5 to achieve the connection between the superconducting cable and the multiple cable installation bodies 5.

[0085] S2: Install the cable installation body 5 on the inner wall of the inner cylinder assembly 1; push the multiple cable installation bodies 5 into the inner cylinder body 11. Specifically, a special tool such as a cylinder or other feasible tools can be used to assist in pushing the cable installation body 5 into the inner cylinder body 11, so that the multiple cable installation bodies 5 support the superconducting cable.

[0086] S3: Connect the outer cylinder 2 to the outer periphery of the inner cylinder assembly 1 to form a vacuum insulation chamber 3. After the inner cylinder assembly 1 is connected to the interior of the outer cylinder 2 and a chamber is formed between the inner cylinder assembly 1 and the outer cylinder 2, the chamber is evacuated and the vacuum level is checked using a vacuum gauge 223. If the vacuum level cannot be achieved within 24 hours and is maintained at 0.1 Pa after 24 hours, heating and nitrogen displacement are performed at 80°C for 4-6 hours. The chamber is then evacuated again. Once the required vacuum level is achieved, the vacuum valve 222 is closed. Since the insulation layer 13 may adsorb large, difficult-to-extract gases such as water molecules and oil, heating and nitrogen displacement can expel these gases. The vacuum level is monitored using a vacuum gauge 223, ensuring that the vacuum insulation chamber 3 formed between the outer cylinder 2 and the inner cylinder assembly 1 is maintained in a vacuum state as much as possible, mitigating heat conduction and convection from the room temperature region to the superconducting cable in the low-temperature operating region.

[0087] In some embodiments, after the cable mounting body 5 with the cable 6 is installed on the inner wall of the inner cylinder assembly 1, the method further includes: setting a first support portion 41 of the first support structure 4 on the outer wall of the inner cylinder assembly 1, and setting a second support portion 42 of the first support structure 4 on the inner wall of the outer cylinder body 2.

[0088] Among them, after keeping the outer surfaces of the inner cylinder body 11 and the outer cylinder body 2 clean, the first support part 41 can be welded to the inner cylinder body 11 by argon arc welding, and the second support part 42 can be welded to the outer cylinder body 2 by argon arc welding. It is more convenient to connect the inner cylinder body 11 and the outer cylinder body 2, and it is also convenient to set the thermal insulation pad 53 between the first support part 41 and the second support part 42, thereby preparing for the connection support of the inner cylinder body 11 and the outer cylinder body 2.

[0089] In some embodiments, connecting the outer cylinder 2 to the outer periphery of the inner cylinder assembly 1 to form the vacuum insulation chamber 3 includes:

[0090] S31: The inner cylinder assembly 1 is installed into the multiple axially distributed first cylinder segments 21 of the outer cylinder 2; that is, after the inner cylinder assembly 1 is first passed through the multiple axially distributed first cylinder segments 21, it is convenient to connect the first support structure 4 between the inner cylinder body 11 and the outer cylinder 2.

[0091] S32: Connect the first support portion 41 of the inner cylinder assembly 1 to the second support portion 42 of the first cylinder segment 21; for example, connect the first heat insulation plate 43 between the first support portion 41 and the second support portion 42, thereby reducing the heat transfer between the inner cylinder body 11 and the outer cylinder 2 at the first support structure 4, keeping the temperature of the superconducting cable always within a preset range, and when connecting the first support portion 41 and the second support portion 42, the axial end of the first cylinder segment 21 of the outer cylinder 2 can be extended into the space between the inner cylinder body 11 and the outer cylinder 2 for connection, thereby improving the convenience of connection.

[0092] S33: Connect the second barrel segments 22 between adjacent first barrel segments 21. Specifically, the second barrel segments 22 include two oppositely disposed semicircular structures. First, the two semicircular second barrel segments 22 are welded relative to each other around the outer circumference of the inner barrel body 11. Then, one end of the second barrel segment 22 is welded to one end of the first barrel segment 21, thereby achieving the connection between the first barrel segment 21 and the second barrel segment 22. After welding, non-destructive testing such as radiographic testing and leak rate testing is performed to improve the integrity and sealing of the outer barrel 2 and reduce heat radiation and heat transfer.

[0093] In some embodiments, before connecting the second barrel segments 22 between adjacent first barrel segments 21 , the process further includes: connecting the gravity support structure 7 to the outer wall of the first barrel segment 21 , and then connecting the gravity support structure 7 to the outer wall of the inner barrel assembly 1 .

[0094] That is, after the first support structure 4 between the inner cylinder body 11 and the outer cylinder body 2 is connected, the first connection part 71, the second connection part 72 and the second heat insulation board 73 are connected to form an integral gravity support structure 7, and the second connection part 72 of the gravity support structure 7 is connected to the outer periphery of the first cylinder segment 21. At the same time, the first connection part 71 is welded to the outer periphery of the inner cylinder body 11. Of course, it is also possible to decide whether to first connect the gravity support structure 7 to the first cylinder segment 21 or to first connect to the inner cylinder body 11 according to the convenience of actual connection, so as to realize the support of the inner cylinder body 11 and the outer cylinder 2 by the gravity support structure 7.

[0095] That is, each first cylinder segment 21 of the outer cylinder 2 is used to connect the gravity support structure 7 and the first support structure 4 , and the second cylinder segment 22 is used to connect adjacent first cylinder segments 21 .

[0096] In some embodiments, before connecting the outer cylinder 2 to the outer periphery of the inner cylinder assembly 1 to form the vacuum insulation chamber 3, the method further includes:

[0097] S21: Connect the cooling element 12 to the outer periphery of the inner cylinder body 11; before connecting the cooling element 12 to the outer wall of the inner cylinder body 11, first clean the outer periphery of the inner cylinder body 11 to keep the surface clean, and then weld the cooling elements 12 to the outer periphery of the inner cylinder body 11 at intervals along the circumferential direction. After welding, perform non-destructive testing such as radiographic testing and leak rate testing. After welding, the cooling element 12 meets the leakage rate requirement of less than 1x10 at a pressure of 30 bar. -9 Pa·m 3 / s.

[0098] It should be noted that when the first support portion 41 is welded to the outer wall of the inner cylinder body 11, and the second support portion 42 is welded to the inner wall of the outer cylinder body 2, as well as when the first connection portion 71 of the gravity support structure 7 is welded to the outer wall of the inner cylinder body 11, and the second connection portion 72 of the gravity support structure 7 is welded to the outer wall of the outer cylinder body 2, non-destructive testing such as radiographic testing and leak rate testing must be carried out after welding is completed to ensure the sealing and reliability of the welding, thereby improving the stability of the overall structure.

[0099] S22: The surface of the inner cylinder body 11 is pickled and passivated, and then cleaned and baked. Cleaning is performed with distilled water, followed by baking at 120°C to reduce impurities adhering to the surface of the inner cylinder body 11, thereby increasing the vacuum level between the inner cylinder body 11 and the outer cylinder body 2 after evacuation. Baking the inner cylinder body 11 at 120°C reduces the amount of gas adsorbed on the surface of the inner cylinder body 11, thereby reducing the gas pressure between the inner cylinder body 11 and the outer cylinder body 2 and increasing the vacuum level.

[0100] S23: Bake the insulation layer 13 and connect it to the outside of the cooling element 12. In practice, before wrapping the insulation layer 13, place the insulation layer 13 in a nitrogen box and bake it at 80°C for 24 hours. Baking can remove impurities such as moisture, grease, wax, and alkali, accelerate the degassing of the insulation layer 13, and shorten the subsequent vacuuming time.

[0101] Moreover, before wrapping, the multi-layer composite insulation layer 131 of the insulation layer 13, or the multi-layer first insulation layer 134 and the multi-layer second insulation layer 132 can each preferably adopt an 80-120 mm wide rolled multi-layer insulation layer 13 and wrap it in a half-folded form. During the wrapping process, ensure that the insulation layer 13 is flat and wrinkle-free, each circle covers 50%±5% of the width of the previous circle, and the initial wrapping angle is 22.5°-45° with the circumferential direction of the inner tube body 11, which can effectively reduce the possibility of loose winding of the insulation layer.

[0102] In some embodiments, after the heat insulating layer 13 is baked and connected to the outside of the cooling member 12 , the process includes: providing a plurality of vacuum holes in the heat insulating layer 13 .

[0103] That is, after the insulation layer 13 is set, a stainless steel needle with a diameter of 2-3 mm can be used to poke a vacuum hole on the insulation layer 13. The vacuum hole is deep to the bottom layer of the insulation layer 13, and the hole spacing is 180 mm-240 mm. The vacuum hole can effectively discharge the gas inside the insulation layer 13, thereby increasing the vacuum degree between the inner cylinder body 11 and the outer cylinder body 2, thereby better reducing the effect of heat transfer.

[0104] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0105] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A cable insulation structure, characterized in that: include: A cable installation body, wherein a cable is inserted into the cable installation body; an inner cylinder assembly, wherein the inner cylinder assembly is sleeved on the cable mounting body, and a first heat-insulating cavity is formed between the inner cylinder assembly and the cable mounting body; An outer cylinder, the outer cylinder being sleeved outside the inner cylinder assembly, a vacuum insulation cavity being formed between the outer cylinder and the inner cylinder assembly, and temperature zones corresponding to the cable mounting body, the inner cylinder assembly, and the outer cylinder being increased in sequence; The inner cylinder assembly includes an inner cylinder body and a cooling element, wherein the cooling element is provided on the outer peripheral wall of the inner cylinder body and a cooling medium is provided in the cooling element; The inner cylinder assembly further includes an insulation layer, which is disposed on the outside of the cooling element. The insulation layer includes at least multiple composite insulation layers, a first insulation layer, a second insulation layer, and a fastening layer. Each composite insulation layer includes an insulation sublayer and a reflection sublayer. The multiple composite insulation layers are distributed radially from the inner cylinder body to the outer cylinder body, and the reflection sublayer includes a reflection surface facing the outer cylinder body. The first thermal insulation layer and the second thermal insulation layer are respectively located on both sides of the multi-layer composite thermal insulation layer. The thermal conductivity of the first thermal insulation layer and the second thermal insulation layer is lower than that of the composite thermal insulation layer. The first thermal insulation layer is connected to the inner cylinder body and the second thermal insulation layer faces the outer cylinder body. The fastening layer is provided on the outside of the second thermal insulation layer.

2. The cable insulation structure according to claim 1, characterized in that: The cable installation body includes a support body and a support leg. The cable is installed on the support body. One end of the support leg is connected to the support body, and the other end is connected to the inner wall of the inner cylinder assembly.

3. The cable insulation structure according to claim 2, characterized in that: A heat insulation pad is provided between the support body and the support legs.

4. The cable insulation structure according to claim 2, characterized in that: The support body is provided with a heat-insulating ring, and the cable is passed through the heat-insulating ring to be supported on the cable installation body.

5. The cable insulation structure according to claim 1, characterized in that: A first support structure is further provided between the inner cylinder assembly and the outer cylinder body. The first support structure includes a first support portion, a second support portion and a first heat insulation board. The first support portion is connected to the inner cylinder assembly and the second support portion is connected to the outer cylinder body. The first heat insulation board is connected between the first support portion and the second support portion.

6. The cable insulation structure according to claim 5, characterized in that: The first support portion, the second support portion and the first heat insulation plate are connected via a connecting assembly, and a portion of the connecting assembly that penetrates the first support portion, the second support portion and the first heat insulation plate is provided with a heat insulation sleeve.

7. The cable insulation structure according to claim 6, characterized in that: The first heat insulation board has multiple contact surfaces with the first support portion and multiple contact surfaces with the second support portion.

8. The cable insulation structure according to claim 1, characterized in that: It also includes a gravity support structure, which includes a first connecting part, a second connecting part and a supporting part distributed up and down, the first connecting part is connected to the inner cylinder assembly, the second connecting part is connected to the outer cylinder body, and a second heat insulation plate is provided between the first connecting part and the second connecting part.

9. The cable insulation structure according to claim 8, characterized in that: The second heat insulation board has a plurality of contact surfaces with the first connection portion, and the second heat insulation board has a plurality of contact surfaces with the second connection portion.

10. The cable insulation structure according to claim 9, characterized in that: The outer cylinder includes a plurality of first cylinder segments and a plurality of second cylinder segments arranged along the axial direction, the plurality of first cylinder segments are spaced apart along the axial direction, and the bottom of each first cylinder segment is connected to the gravity support structure, and a second cylinder segment is connected between adjacent first cylinder segments, and the second cylinder segment is formed by splicing two semi-arc cylinder segments.

11. The cable insulation structure according to claim 1, characterized in that: The outer cylinder is further provided with a vacuum extraction port and a vacuum gauge. The vacuum gauge measures the vacuum degree of the vacuum insulation cavity, and the vacuum extraction port is used for vacuuming.

12. A method for manufacturing a cable insulation structure, for manufacturing the cable insulation structure according to any one of claims 1 to 11, characterized in that: The following steps are involved: Pass the cable through the cable installation body; A cable installation body through which a cable is passed is installed in the inner cylinder assembly, a first support portion of a first support structure is provided on an outer wall of the inner cylinder assembly, and a second support portion of the first support structure is provided on an inner wall of the outer cylinder assembly; Connecting a cooling element to the outer periphery of the inner cylinder body, pickling and passivating the surface of the inner cylinder body, cleaning and baking the inner cylinder body, baking the heat insulating layer and connecting it to the outside of the cooling element; The outer cylinder is connected to the outer periphery of the inner cylinder assembly and the first support portion and the second support portion are connected to form a vacuum insulation chamber.

13. The method for manufacturing a cable thermal insulation structure according to claim 12, characterized in that: The method of connecting the outer cylinder to the outer periphery of the inner cylinder assembly to form a vacuum insulation chamber includes: Installing the inner cylinder assembly into a plurality of axially distributed first cylinder segments of the outer cylinder; Connecting the first support portion of the inner barrel assembly to the second support portion of the first barrel segment; The second barrel segments are connected between adjacent first barrel segments.

14. The method for manufacturing a cable thermal insulation structure according to claim 13, characterized in that: Before connecting the second barrel segments between adjacent first barrel segments, the method further includes: After the gravity support structure is connected to the outer wall of the first barrel segment, the gravity support structure is connected to the outer wall of the inner barrel assembly.

15. The method for manufacturing a cable thermal insulation structure according to claim 12, characterized in that: After the heat insulating layer is baked and connected to the outside of the cooling element, the method includes: piercing a plurality of vacuum holes in the heat insulating layer.

Images