Forced cooling mineral insulated cable

Abstract

The utility model relates to the technical field of insulated cable discloses a forced cooling mineral insulated cable, including cooling liquid, conducting wire core, insulating layer, metal sheath layer and anticorrosive layer, the conducting wire core is hollow tubular empty core copper conduit, and cooling liquid fills and circulates in the hollow inner chamber of conducting wire core, the surface fixed connection of conducting wire core has insulating layer, the utility model discloses a cooling liquid adopts heat conduction oil, and with metal sheath layer as center circle equidistant distribution, this design can effectively reduce the temperature of cable in the operation process, improves the ampacity and life of cable, and the conducting wire core is empty core copper conduit, this structure not only has improved the conductivity, but also has provided the flowing channel for cooling liquid, further enhanced the cooling effect, through setting up insulating layer adopts magnesium oxide, has excellent insulating property and high temperature resistant characteristic, and metal sheath layer adopts copper sheath, not only provides good mechanical protection, but also enhances the corrosion resistance and fire -resistant performance of cable.

Description

Technical Field

[0001] This utility model relates to the field of insulated cable technology, and in particular to a forced-cooling mineral-insulated cable. Background Technology

[0002] Organic insulated cables such as polyethylene, fluoroplastics, and polyvinyl chloride have short service lives in the active zone of nuclear reactors. Repeated experimental studies have proven that mineral insulated cables can operate for extended periods within the active zone of nuclear reactors. Transmission cables carrying high currents generate significant Joule heat. Traditional MIG (Metal Inert Gas) cables primarily dissipate heat through convection between the outer copper sheath and air or through contact with a solid dielectric. Increasing the maximum current carrying capacity requires increasing the conductor cross-section, which also increases cable weight and stiffness, limiting its operability. Therefore, this technical field provides a forced-cooling mineral-insulated cable to address the problems mentioned in the background section. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a forced cooling mineral-insulated cable.

[0004] This utility model is achieved by the following technical solution: a forced-cooling mineral-insulated cable, comprising a coolant, a conductive core, an insulation layer, a metal sheath layer, and an anti-corrosion layer. The conductive core is a hollow tubular copper conduit, and the coolant fills and circulates within the hollow cavity of the conductive core. An insulation layer is fixedly connected to the surface of the conductive core, a metal sheath layer is fixedly connected to the surface of the insulation layer, and an anti-corrosion layer is fixedly connected to the surface of the metal sheath layer.

[0005] Through the above technical solution, the anti-corrosion layer is ceramic paint. The ceramic paint is evenly sprayed on the surface of the metal sheath layer, which isolates the copper sheath from oxidation reaction with oxygen and water, and has a good anti-corrosion effect. The surface can maintain its brightness for a long time.

[0006] As a further improvement to the above scheme, the number of coolants is set to four, and the four coolants are evenly distributed in a circle around the metal sheath layer, and the coolant is heat transfer oil.

[0007] Through the above technical solution, the main component of the coolant is aromatic hydrocarbons, whose boiling point is much higher than that of water (100 degrees Celsius), and whose thermal conductivity is also better than that of water. The cable is connected at both ends by conduits to a cooling system and a circulating pump, forming a liquid circulation system. The Joule heat generated during cable operation is dissipated by the heat-conducting oil through the cooling system, ensuring the cooling efficiency of the circulation system and improving the stability of the cable during operation.

[0008] As a further improvement to the above solution, a conductive core is provided inside the metal sheath layer, and a coolant is provided inside the metal sheath layer. The conductive core is a hollow copper conduit.

[0009] Through the above technical solution, the purity of copper is not less than 99.95%, and the hollow core is used for filling with coolant.

[0010] As a further improvement to the above solution, the insulating layer is magnesium oxide.

[0011] As a further improvement to the above scheme, the number of conductive cores is set to four, and the four conductive cores are evenly distributed around the metal sheath layer as the center. The metal sheath layer is a copper sheath.

[0012] Through the above technical solution, the copper sheath is continuously wrapped longitudinally with copper strip. The edges of the copper strip are welded using argon arc welding under the protection of a mixture of argon and helium gas. After the copper sheath is completed, the integrity of the sheath is verified in accordance with the requirements of GB / T 13033.1-2007 (the cable must be completely immersed in water at (15±10)℃ for at least 1 hour; the insulation resistance measurement should be completed within 8 hours after the cable is taken out of the water; after the copper sheath is stripped off at the cable end to expose the conductor, a temporary seal should be applied to the end; a voltage of 2.5kV should be applied between the conductors and between all conductors and the copper sheath, with a minimum voltage increase rate of 150V / s and a duration of at least 60s).

[0013] As a further improvement to the above solution, a coolant is provided inside the anti-corrosion layer, and the anti-corrosion layer is a ceramic paint.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention utilizes heat-conducting oil as the coolant, with equidistant distribution around the metal sheath layer. This design effectively reduces the cable's temperature during operation, increasing its current carrying capacity and service life. The conductive core is a hollow copper conduit, which not only improves conductivity but also provides a flow channel for the coolant, further enhancing the cooling effect. The insulation layer uses magnesium oxide, providing excellent insulation and high-temperature resistance. The copper sheath layer not only offers good mechanical protection but also enhances the cable's corrosion resistance and fire resistance, enabling the cable to maintain stable electrical performance even in harsh environments such as high temperature and high humidity.

[0015] This invention utilizes a ceramic paint-based anti-corrosion layer, which possesses excellent corrosion resistance and abrasion resistance. The anti-corrosion layer also incorporates a coolant, further enhancing the cable's heat dissipation performance and extending its service life. Through the synergistic effect of these components, this forced-cooling mineral-insulated cable not only exhibits superior electrical and mechanical properties but also achieves efficient cooling and anti-corrosion functions. It is particularly suitable for high-temperature, high-current-carrying applications, such as in metallurgy, chemical engineering, and power industries. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the side anatomical structure of this utility model; Figure 3 This is a schematic diagram of the anatomical structure of the present invention; Figure 4 This is a schematic diagram of the right-side structure of this utility model.

[0017] Explanation of key symbols: 1. Coolant; 2. Conductive core; 3. Insulation layer; 4. Metal sheath layer; 5. Anti-corrosion layer. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. Example

[0019] Please combine Figure 1-4 This embodiment of a forced-cooling mineral-insulated cable includes a coolant 1, a conductive core 2, an insulation layer 3, a metal sheath layer 4, and an anti-corrosion layer 5. The conductive core 2 is a hollow tubular copper conduit, and the coolant 1 fills and circulates within the hollow cavity of the conductive core 2. The insulation layer 3 is fixedly connected to the surface of the conductive core 2, the metal sheath layer 4 is fixedly connected to the surface of the insulation layer 3, and the anti-corrosion layer 5 is fixedly connected to the surface of the metal sheath layer 4. By using heat-conducting oil as the coolant 1 and distributing it equidistantly around the metal sheath layer 44, this design... It can effectively reduce the temperature of the cable during operation, increase the current carrying capacity and service life of the cable. The conductive core 2 is a hollow copper conduit. This structure not only improves the conductivity, but also provides a flow channel for the coolant 1, further enhancing the cooling effect. The insulation layer 3 is made of magnesium oxide, which has excellent insulation performance and high temperature resistance. The metal sheath layer 4 is made of copper, which not only provides good mechanical protection, but also enhances the cable's corrosion resistance and fire resistance, so that the cable can maintain stable electrical performance in harsh environments such as high temperature and high humidity.

[0020] The anti-corrosion layer 5 is a ceramic paint. The ceramic paint is evenly sprayed on the surface of the metal sheath layer 4, which isolates the copper sheath from oxidation reactions with oxygen and water, and has a good anti-corrosion effect. The surface can maintain its brightness for a long time.

[0021] The quantity of coolant 1 is set to four, and the four coolants 1 are evenly distributed in a circle around the metal sheath layer 4. The coolant 1 is heat transfer oil.

[0022] Coolant 1 is mainly composed of aromatics, with a boiling point much higher than 100 degrees Celsius, and its thermal conductivity is also superior to that of water. The cable is connected at both ends by conduits to a cooling system and a circulating pump, forming a liquid circulation system. The Joule heat generated during cable operation is dissipated by the heat-conducting oil through the cooling system, ensuring the cooling efficiency of the circulation system and improving the stability of the cable during operation.

[0023] The metal sheath layer 4 contains a conductive core 2, and the metal sheath layer 4 contains a coolant 1. The conductive core 2 is a hollow copper conduit.

[0024] The copper purity is not less than 99.95 percent, and the hollow core is used for filling with coolant.

[0025] Insulation layer 3 is magnesium oxide. Magnesium oxide powder is added into the welded metal sheath and subjected to multiple drawing processes to compact the magnesium oxide powder, increase the magnesium oxide density, and improve electrical performance. During drawing, the core positioning is ensured to be accurate and not deviated, so as to avoid affecting the structural dimensions and electrical parameters of the cable. Magnesium oxide should be stored in a dry place to avoid contamination and moisture.

[0026] The number of conductive cores 2 is set to four, and the four conductive cores 2 are evenly distributed around the metal sheath layer 4 as the center. The metal sheath layer 4 is a copper sheath. The anti-corrosion layer 5 is made of ceramic paint, which has good corrosion resistance and wear resistance. Coolant 1 is set inside the anti-corrosion layer 5, which further enhances the heat dissipation performance of the cable and extends the service life of the cable. Through the synergistic effect of the above parts, this forced cooling mineral insulated cable not only has excellent electrical and mechanical properties, but also achieves efficient cooling and anti-corrosion functions. It is particularly suitable for high temperature and high current carrying capacity applications, such as metallurgy, chemical industry, power industry and other fields.

[0027] The copper sheath is made of continuous longitudinally wrapped copper strip. The edges of the copper strip are welded using argon arc welding under the protection of a mixture of argon and helium gas. After the copper sheath is completed, the sheath integrity is verified in accordance with GB / T 13033.1-2007 (the cable must be completely immersed in water at (15±10)℃ for at least 1 hour; the insulation resistance measurement should be completed within 8 hours after the cable is taken out of the water; after the copper sheath is stripped off at the cable end to expose the conductor, a temporary seal should be applied to the end; a voltage of 2.5kV should be applied between the conductors and between all conductors and the copper sheath, with a minimum voltage increase rate of 150V / s and a duration of at least 60s).

[0028] Coolant 1 is placed inside the anti-corrosion layer 5, and the anti-corrosion layer 5 is ceramic paint.

[0029] The implementation principle of a forced-cooling mineral-insulated cable in this embodiment is as follows: By using heat-conducting oil as the coolant 1 and distributing it equidistantly around the metal sheath layer 44, this design effectively reduces the cable's temperature during operation, increasing its current carrying capacity and service life. The conductive core 2 is a hollow copper conduit, which not only improves conductivity but also provides a flow channel for the coolant 1, further enhancing the cooling effect. The insulation layer 3 is made of magnesium oxide, which has excellent insulation performance and high-temperature resistance. The metal sheath layer 4 is made of copper, providing not only good mechanical protection but also... The cable's corrosion resistance and fire resistance are enhanced, enabling it to maintain stable electrical performance even in harsh environments such as high temperature and high humidity. The anti-corrosion layer 5, made of ceramic paint, possesses excellent corrosion and wear resistance. Coolant 1 is incorporated within the anti-corrosion layer 5, further enhancing the cable's heat dissipation performance and extending its service life. Through the synergistic effect of these components, this forced-cooling mineral-insulated cable not only possesses excellent electrical and mechanical properties but also achieves efficient cooling and corrosion protection, making it particularly suitable for high-temperature, high-current-carrying applications such as metallurgy, chemical engineering, and power generation.

[0030] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A forced-cooling mineral-insulated cable, characterized in that, It includes a coolant (1), a conductive core (2), an insulation layer (3), a metal sheath layer (4), and an anti-corrosion layer (5). The conductive core (2) is a hollow tubular copper conduit. The coolant (1) fills and circulates in the hollow cavity of the conductive core (2). The surface of the conductive core (2) is fixedly connected to the insulation layer (3), the surface of the insulation layer (3) is fixedly connected to the metal sheath layer (4), and the surface of the metal sheath layer (4) is fixedly connected to the anti-corrosion layer (5).

2. The forced-cooling mineral-insulated cable as described in claim 1, characterized in that: The quantity of coolant (1) is set to four, and the four coolants (1) are distributed equidistantly around the metal sheath layer (4) as the center. The coolant (1) is heat transfer oil.

3. The forced-cooling mineral-insulated cable as described in claim 1, characterized in that: The metal sheath layer (4) is provided with a conductive core (2) inside, and a coolant (1) is provided inside the metal sheath layer (4). The conductive core (2) is a hollow copper conduit.

4. The forced-cooling mineral-insulated cable as described in claim 1, characterized in that: The insulating layer (3) is magnesium oxide.

5. A forced-cooling mineral-insulated cable as described in claim 1, characterized in that: The number of the conductive cores (2) is set to four, and the four conductive cores (2) are distributed equidistantly around the metal sheath layer (4) as the center. The metal sheath layer (4) is a copper sheath.

6. The forced-cooling mineral-insulated cable as described in claim 1, characterized in that: The anti-corrosion layer (5) is provided with a coolant (1) inside, and the anti-corrosion layer (5) is a ceramic paint.

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