Corc cable cooling and bearing device based on liquid nitrogen circulation

Abstract

The invention discloses a liquid nitrogen circulation-based corc cable cooling and bearing device, which belongs to the technical field of superconducting cables, and comprises a substrate, the substrate is in a strip shape with a hollow middle part, a corc cable channel is arranged in the substrate, a liquid nitrogen injection channel is arranged at the hollow part of the substrate, and tin soldering injection channels are arranged at two sides of the substrate. The liquid nitrogen injection channel is connected with inner cooling circulation pipelines, the inner cooling circulation pipelines are connected with the corc cable channel, and an outer cooling circulation pipeline is connected between the inner cooling circulation pipelines. According to the corc cable cooling bearing device based on liquid nitrogen circulation, liquid nitrogen is injected through the liquid nitrogen injection channel, a liquid nitrogen circulation pipeline is formed through the inner cooling circulation pipeline and the outer cooling circulation pipeline in the base, and the liquid nitrogen is fed into the liquid nitrogen heat exchange layer in the corc cable channel to absorb heat in a corc cable; effective absorption of heat generated by the corc cable due to alternating current loss is realized, and stable and normal operation of the corc cable and related systems is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of superconducting cables, in particular to a corc cable cooling and carrying device based on liquid nitrogen circulation. BACKGROUND

[0002] The corc type high-temperature superconducting cable is a layered structure, with a conductive metal rod as a central support body, and a yttrium barium copper oxide high-temperature superconducting tape wound outside. The tape has zero resistance, and a single cable can carry hundreds of amperes of current. Multiple layers of tight winding can greatly improve the overall current carrying capacity of the cable, and can work stably at a higher temperature. The current carrying density is tens of times that of conventional conductors, and is suitable for large current and strong magnetic field scenarios.

[0003] Under alternating current environment, when the external magnetic field gradually increases, the alternating current loss of the corc cable will increase substantially, which will cause the cable to heat up. If the heat generated by the cable cannot be removed, the heat will accumulate, causing the temperature of the cable to rise, and even losing superconductivity.

[0004] Therefore, there is an urgent need for a corc cable cooling and carrying device. SUMMARY

[0005] The purpose of the present application is to provide a corc cable cooling and carrying device based on liquid nitrogen circulation. The corc cable is carried and fixed by injecting tin solder from the corc cable channel and the tin solder injection channel. Liquid nitrogen is injected through the liquid nitrogen injection channel. The liquid nitrogen circulation pipeline is formed by the inner cooling circulation pipeline and the outer cooling circulation pipeline in the base. The liquid nitrogen is sent to the liquid nitrogen heat exchange layer in the corc cable channel to absorb the heat in the corc cable. The heat generated by the corc cable due to alternating current loss is effectively absorbed, and the stable and normal operation of the corc cable and related systems is ensured.

[0006] To achieve the above purpose, the present application provides a corc cable cooling and carrying device based on liquid nitrogen circulation, which comprises a base. The base is a long strip with a hollow middle part. The base is provided with a corc cable channel. The hollow part of the base is provided with a liquid nitrogen injection channel. The base is provided with tin solder injection channels on both sides. The tin solder injection channels are connected to the corc cable channel. The liquid nitrogen injection channel is connected to an inner cooling circulation pipeline. The inner cooling circulation pipeline is connected to the corc cable channel. The adjacent inner cooling circulation pipelines are connected to an outer cooling circulation pipeline. The corc cable channel comprises a pouring layer, a separation layer and a liquid nitrogen heat exchange layer.

[0007] Preferably, the outer cooling circulation pipeline is arranged in the hollow part of the middle part of the base, and the inner cooling circulation pipeline is arranged in the solid structure of the outer layer of the base.

[0008] Preferably, the corc cable channel is provided with a corc cable, and the corc cable channel is sequentially provided with the corc cable, the pouring layer, the isolation layer and the liquid nitrogen heat exchange layer from inside to outside.

[0009] Preferably, the pouring layer is provided with a temperature sensor.

[0010] Preferably, the tin solder injection channel is connected to the pouring layer in the corc cable channel, and the inner cooling circulation pipeline is connected to the liquid nitrogen heat exchange layer in the corc cable channel.

[0011] Preferably, the number of the corc cable channels is four, and the corc cable channels penetrate the base along the length direction, and the cross-sectional shape of the base is a back-shaped.

[0012] Preferably, two inner cooling circulation pipelines are connected to each connection position of the corc cable channel and the inner cooling circulation pipeline.

[0013] Preferably, twelve inner cooling circulation pipelines are arranged in the base, and eight outer cooling circulation pipelines are arranged in the hollow part of the base.

[0014] Preferably, the inner cooling circulation pipeline and the outer cooling circulation pipeline jointly form a liquid nitrogen circulation pipeline.

[0015] Preferably, the liquid nitrogen injection channel is arranged at the front and rear ends of the hollow part of the base.

[0016] Therefore, the corc cable cooling bearing device based on liquid nitrogen circulation can bear and fix the corc cable by injecting tin solder from the corc cable channel and the tin solder injection channel, can inject liquid nitrogen through the liquid nitrogen injection channel, can form a liquid nitrogen circulation pipeline through the inner cooling circulation pipeline and the outer cooling circulation pipeline in the base, and can send the liquid nitrogen into the liquid nitrogen heat exchange layer in the corc cable channel to absorb the heat in the corc cable, so that the heat generated by the corc cable due to alternating current loss can be effectively absorbed, and the stable and normal operation of the corc cable and related systems can be ensured.

[0017] The technical solutions of the present application will be further described in detail below with reference to the drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic view of an embodiment of the corc cable cooling bearing device based on liquid nitrogen circulation of the present application; Figure 2 is a side view structural schematic view of an embodiment of the corc cable cooling bearing device based on liquid nitrogen circulation of the present application; Figure 3is a corc cable passage structure schematic diagram of a corc cable cooling bearing device embodiment based on liquid nitrogen circulation according to the present application; Figure 4 is a control principle diagram of a corc cable cooling bearing device embodiment based on liquid nitrogen circulation according to the present application.

[0019] Reference signs 1, base; 2, corc cable passage; 3, liquid nitrogen injection passage; 4, solder injection passage; 5, inner cooling circulation pipeline; 6, outer cooling circulation pipeline; 7, corc cable; 8, pouring layer; 9, temperature sensor; 10, isolation layer; 11, liquid nitrogen heat exchange layer. DETAILED DESCRIPTION

[0020] The technical solutions of the present application are further described below through the drawings and embodiments.

[0021] Unless otherwise defined, the technical terms or scientific terms used in the present application shall be understood as the usual meanings understood by those skilled in the art to which the present application belongs. The "first", "second" and similar words used in the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Include" or "contain" and similar words mean that the elements or objects before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connected" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent relative positional relationships, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0022] Example 1 The present application provides a corc cable cooling bearing device based on liquid nitrogen circulation, as shown in Figure 1 , Figure 2 , which comprises a base 1, the base 1 is a long strip with a hollow middle part, the cross-sectional shape of the base 1 is a back-shaped, in this embodiment, the outer perimeter length of the base 1 is 90mm, the inner perimeter length is 50mm, and the height of the base 1 is 300mm.

[0023] Four corc cable passages 2 for bearing corc cables are arranged in the base 1, the corc cable passages 2 penetrate through the base 1 along the length direction, in this embodiment, the inner diameter of the corc cable passage 2 on the base 1 is 6mm, and the centers of the four corc cable passages 2 are located at a position 30mm away from the center of the back-shaped face in both length and width.

[0024] As shown in Figure 3As shown, the CRC cable channel 2 consists of, from the inside out, the CRC cable 7, the casting layer 8, the isolation layer 10, and the liquid nitrogen heat exchange layer 11.

[0025] Solder injection channels 4 are provided on both sides of the substrate 1. In this embodiment, the solder injection channels 4 are made of copper or aluminum tubes and are circular pipes that are inclined upward at 45°. The inner diameter is 2mm and the outer diameter is 3mm. Two solder injection channels 4 are provided every 75mm along the length of the substrate 1, and 12 solder injection channels 4 are provided on each substrate 1.

[0026] Solder injection channel 4 connects to CRC cable channel 2, and solder injection channel 4 connects to the casting layer 8 in CRC cable channel 2. The main function of solder injection channel 4 is to inject solder. Solder is injected into the casting layer 8 through the channel excavated inside the substrate 1. In scenarios such as kilometer-level current carrying, the solidification of solder completely fixes the CRC cable 7 in the CRC cable channel 2, avoiding structural loosening or poor contact caused by vibration and displacement, and ensuring current carrying stability. A temperature sensor 9 for measuring temperature is installed in the casting layer 8.

[0027] The internal cooling circulation pipe 5 is connected to the CRC cable channel 2. The internal cooling circulation pipe 5 is connected to the liquid nitrogen heat exchange layer 11 in the CRC cable channel 2. Each CRC cable channel 2 is connected to the internal cooling circulation pipe 5 by two internal cooling circulation pipes 5. The internal cooling circulation pipes 5 are connected to each other by external cooling circulation pipes 6. In this embodiment, the diameter of the internal cooling circulation pipe 5 is 4 mm.

[0028] An external cooling circulation pipe 6 is located in the hollowed-out area in the middle of the base 1. In this embodiment, the inner diameter of the external cooling circulation pipe 6 is 4 mm and the outer diameter is 5 mm. An internal cooling circulation pipe 5 is located in the base 1, with twelve internal cooling circulation pipes 5 in each base 1 and eight external cooling circulation pipes 6 in the hollowed-out area of ​​each base 1. The internal cooling circulation pipes 5 and the external cooling circulation pipes 6 together form a liquid nitrogen circulation pipeline. Both the internal cooling circulation pipes 5 and the external cooling circulation pipes 6 are used to transport liquid nitrogen, realizing the circulation and cooling of liquid nitrogen within the device.

[0029] A liquid nitrogen injection channel 3 is provided in the hollow part of the substrate 1. In this embodiment, the inner diameter of the liquid nitrogen injection channel 3 is 4 mm and the outer diameter is 5 mm. The liquid nitrogen injection channel 3 is used to inject liquid nitrogen. The liquid nitrogen injection channel 3 is set at both ends of the hollow part of the substrate 1. The liquid nitrogen injection channel 3 is connected to the inner cooling circulation pipe 5. The liquid nitrogen enters the inner cooling circulation pipe 5 through the liquid nitrogen injection channel 3 at one end, and then flows through the inner cooling circulation pipe 5 into the liquid nitrogen heat exchange layer 11 of the CRC cable channel 2. After absorbing the heat in the CRC cable 7, it is discharged from the liquid nitrogen injection channel 3 at the other end.

[0030] like Figure 4As shown, the liquid nitrogen injection is dynamically adjusted based on the real-time temperature of the CRC cable 7, ensuring the temperature is maintained at approximately 77K, the normal operating temperature range of the CRC cable 7. When the temperature exceeds 77K, the liquid nitrogen injection rate increases by 10% for every 1K increase; when the temperature falls below 77K, the liquid nitrogen injection rate decreases by 10% for every 1K decrease; and when the temperature drops below 70K, liquid nitrogen injection is suspended. Closed-loop feedback control can be used, with the temperature sensor 9 monitoring the temperature of the CRC cable 7 in real time and dynamically adjusting the output flow rate of the liquid nitrogen pump to achieve stable temperature control.

[0031] Therefore, the present invention employs the aforementioned CRC cable cooling and support device based on liquid nitrogen circulation. The CRC cable is supported and fixed by injecting solder into the CRC cable channel and the solder injection channel. Liquid nitrogen is injected through the liquid nitrogen injection channel, and a liquid nitrogen circulation pipeline is formed through the inner and outer cooling circulation pipes in the substrate. Liquid nitrogen is then sent to the liquid nitrogen heat exchange layer in the CRC cable channel to absorb the heat in the CRC cable, effectively absorbing the heat generated by AC losses in the CRC cable and ensuring the stable and normal operation of the CRC cable and related systems.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A CORC cable cooling and bearing device based on liquid nitrogen circulation, characterized in that: The system includes a base, which is a long strip with a central hollow section. A CRC cable channel is provided in the base. A liquid nitrogen injection channel is provided in the hollow section of the base. Solder injection channels are provided on the left and right sides of the base. The solder injection channels are connected to the CRC cable channel. The liquid nitrogen injection channels are connected to internal cooling circulation pipes. The internal cooling circulation pipes are connected to the CRC cable channel. An external cooling circulation pipe is connected between adjacent internal cooling circulation pipes. The CRC cable channel includes a casting layer, an isolation layer, and a liquid nitrogen heat exchange layer.

2. The CORC cable cooling and bearing device based on liquid nitrogen circulation according to claim 1, characterized in that: The cross-sectional shape of the substrate is U-shaped, the external cooling circulation pipe is located in the hollow part in the middle of the substrate, and the internal cooling circulation pipe is located in the solid structure of the outer layer of the substrate.

3. The CORC cable cooling and bearing device based on liquid nitrogen circulation according to claim 1, characterized in that: The Corc cable channel is equipped with a Corc cable, and the Corc cable channel consists of the Corc cable, the casting layer, the isolation layer, and the liquid nitrogen heat exchange layer from the inside to the outside.

4. The CORC cable cooling and bearing device based on liquid nitrogen circulation according to claim 3, characterized in that: A temperature sensor is installed in the pouring layer.

5. A CORC cable cooling and bearing device based on liquid nitrogen circulation according to claim 1, characterized in that: The solder injection channel is connected to the casting layer in the CRC cable channel, and the internal cooling circulation pipe is connected to the liquid nitrogen heat exchange layer in the CRC cable channel.

6. The CORC cable cooling and bearing device based on liquid nitrogen circulation according to claim 1, characterized in that: The number of the corc cable channels is four, and the corc cable channels penetrate the substrate along the length direction.

7. A CORC cable cooling and bearing device based on liquid nitrogen circulation according to claim 1, characterized in that: Each of the corc cable channels is connected to two internal cooling circulation pipes at the connection point with the internal cooling circulation pipe.

8. A CORC cable cooling and bearing device based on liquid nitrogen circulation according to claim 1, characterized in that: The substrate is provided with twelve internal cooling circulation pipes, and the hollowed-out areas of the substrate are provided with eight external cooling circulation pipes.

9. A CORC cable cooling and bearing device based on liquid nitrogen circulation according to claim 1, characterized in that: The internal cooling circulation pipe and the external cooling circulation pipe together form a liquid nitrogen circulation pipeline.

10. A CORC cable cooling and bearing device based on liquid nitrogen circulation according to claim 1, characterized in that: The liquid nitrogen injection channels are located at the front and rear ends of the hollowed-out portion of the substrate.

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