U-shaped Reeling Device for High Temperature Superconducting Cable

Abstract

The present invention discloses a U-shaped retracting and deploying device for a high-temperature superconducting cable; the high-temperature superconducting cable is threaded through a rigid U-shaped retracting and deploying device; the U-shaped retracting and deploying device comprises an arc-shaped pipe section, a first straight pipe section connected to one end of the arc-shaped pipe section, and a second straight pipe section connected to the other end of the arc-shaped pipe section; the first straight pipe section and the second straight pipe section are respectively formed by sequentially splicing a plurality of pipe sections with the same quantity; each pipe section is composed of a casing part, a sleeve part and an L-shaped bracket which are of an integral structure; the diameter of the casing part is smaller than that of the sleeve part; the bottom surface of the horizontal plate of the L-shaped bracket is in sliding connection with a base for carrying the U-shaped retracting and deploying device; the U-shaped retracting and deploying device further comprises an auxiliary contraction device. The present invention improves the reaction force of the U-shaped retracting and deploying device on the length deformation of the high-temperature superconducting cable during the process of the change of the high-temperature superconducting cable from the room-temperature installation state to the cooling use state, and ensures the use safety of the high-temperature superconducting cable during the temperature change process.

Description

Technical Field

[0001] The invention relates to the technical field of high-temperature superconducting cable construction, in particular to a U-shaped retracting and releasing device for high-temperature superconducting cables. Background Art

[0002] High-temperature superconducting cable is an electrical device that uses high-temperature superconducting materials as conductors and can transmit large currents. It is generally composed of four parts: cable core, cryogenic container, terminal and cooling system. Its normal operating temperature is the liquid nitrogen temperature range (77K, about -196℃).

[0003] During the early installation and construction of superconducting cables, the superconducting cables are at room temperature. Before the superconducting cables are put into operation, the temperature of the superconducting cables is lowered from room temperature to the liquid nitrogen temperature zone through the cooling system. During this process, the superconducting cable body (cable core) will shrink due to the cold. According to actual engineering experience, the entire superconducting cable refrigeration process generally takes several days. On the other hand, when the superconducting cable is in a shutdown and maintenance state, the liquid nitrogen inside the superconducting cable needs to be released to raise the temperature of the superconducting cable from the liquid nitrogen temperature zone to room temperature, and the superconducting cable body will expand due to the heat.

[0004] Since the temperature change of superconducting cables has a relatively long time period, the temperature change rate of superconducting cables is related to parameters such as the length of the cable, the power of the cooling system, and the real-time flow rate in the liquid nitrogen tube. According to the results of experiments and simulation calculations, the expansion rate of superconducting cables during the conversion process between the liquid nitrogen temperature zone and room temperature is generally about 0.3% (that is, a superconducting cable with a length of 1000 meters can expand and contract by about 3 meters during temperature changes), and the axial force it bears will be greater than 3 tons. This leads to the fact that during the temperature change process of the superconducting cable, the cable body (cable core) is very likely to undergo irregular deformation, causing damage to the superconducting cable body and reducing its normal service life.

[0005] Therefore, how to reduce the potential damage risk of superconducting cables due to deformation during temperature changes has become a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0006] In view of the above-mentioned defects of the prior art, the present invention provides a U-shaped retractable device for a high-temperature superconducting cable, the technical purpose of which is to reduce the reaction force of the U-shaped retractable device on the deformation of the high-temperature superconducting cable during the temperature change process of the high-temperature superconducting cable, thereby ensuring the safety of the use of the high-temperature superconducting cable during the temperature change process.

[0007] To achieve the above-mentioned purpose, the present invention discloses a U-shaped retractable device for a high-temperature superconducting cable, wherein the high-temperature superconducting cable is inserted into the hard U-shaped retractable device; the U-shaped retractable device comprises an arc-shaped pipe section, a first straight pipe section connected to one end of the arc-shaped pipe section, and a second straight pipe section connected to the other end of the arc-shaped pipe section;

[0008] The first straight pipe section and the second straight pipe section are respectively formed by sequentially splicing a plurality of pipe sections with the same quantity; each of the pipe sections is composed of a sleeve part, a sleeve tube part and an L-shaped bracket which are of an integral structure; the diameter of the sleeve part is smaller than that of the sleeve tube part;

[0009] In the installation state of the high-temperature superconducting cable, the sleeve tube part of one pipe section is sleeved on the sleeve part of another pipe section which is sequentially spliced, and a certain empty stroke is reserved;

[0010] In the cooling state of the high-temperature superconducting cable, the high-temperature superconducting cable cools and contracts, and the sleeve tube part and the sleeved sleeve part have relative displacement within the distance range of the empty stroke, so as to shorten the lengths of the first straight pipe section and the second straight pipe section to adapt to the length of the high-temperature superconducting cable.

[0011] Preferably, the bottom surface of the horizontal plate of the L-shaped bracket is in sliding connection with the base bearing the U-shaped winding and unwinding device.

[0012] Preferably, the U-shaped winding and unwinding device further comprises an auxiliary contraction device; the auxiliary contraction device comprises an elastic body and a prestress adjusting device; one end of the elastic body is connected with the arc-shaped pipe section; the other end of the elastic body is connected with the prestress adjusting device.

[0013] Preferably, the barrel of the sleeve tube part is provided with a detachable limit screw; the tail end of the sleeve part has a convex edge; the sleeve part has a certain moving stroke in the sleeve tube part and will not fall off from the sleeve tube part.

[0014] Preferably, the thrust force during the movement of the sleeve tube part acts on the vertical plate of the L-shaped bracket of another pipe section which is sequentially spliced.

[0015] Preferably, the bottom surface of the horizontal plate of the L-shaped bracket is provided with a sliding groove and the base is provided with a guide rail; or the bottom surface of the horizontal plate of the L-shaped bracket is provided with a guide rail and the base is provided with a sliding groove; the guide rail and the sliding groove are in sliding connection.

[0016] Preferably, the elastic body is an elastic rubber band or a spring or a tension spring.

[0017] Preferably, the prestress adjusting device is a manual hoist or an electric hoist.

[0018] The beneficial effects of the present invention:

[0019] Due to the above structural design, the U-shaped retracting and deploying device of the present invention can, through a number of pipe segments sleeved at the head and tail, make the length of the straight pipe segment adapt to the length requirement after the high-temperature superconducting cable cools down and expands and contracts, meet the length change requirement of the high-temperature superconducting cable from room temperature installation to cooling operation, reduce the deformation stress of the high-temperature superconducting cable during the temperature change process, and ensure the use safety of the high-temperature superconducting cable during the temperature change process.

[0020] Also due to the structural design of the chute and the guide rail, the U-shaped retracting and deploying device of the present invention, on the one hand, reduces the frictional resistance between the two and correspondingly reduces the reaction force of the retracting and deploying device on the cable. On the other hand, when the high-temperature superconducting cable is in a state where the contraction forces on both sides of the U-shaped section are uneven (generally speaking, the contractions on both sides of the U-shaped section of the high-temperature superconducting cable do not reach complete synchronization, resulting in unequal contraction forces on both sides), due to the existence of the guide rail, the two straight pipe segments can contract synchronously without deviation, always maintaining the parallelism of the two straight pipe segments, and reducing the damage to the high-temperature superconducting cable caused by the asymmetric reaction force.

[0021] The U-shaped retracting and deploying device of the present invention also has an auxiliary contraction device. Through the adjustment of empirical data, the U-shaped retracting and deploying device does not contract when the high-temperature superconducting cable is in the room temperature installation state; when the high-temperature superconducting cable cools down and contracts, the auxiliary contraction device provides an auxiliary acting force for the displacement of the straight pipe segment in the U-shaped retracting and deploying device, further reducing the damage to the high-temperature superconducting cable.

[0022] The present invention improves the reaction force of the U-shaped retracting and deploying device on the length deformation of the high-temperature superconducting cable during the process of the high-temperature superconducting cable changing from the room temperature installation state to the cooling use state, and ensures the use safety of the high-temperature superconducting cable during the cooling use process.

[0023] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the drawings to fully understand the purpose, features and effects of the present invention. Brief Description of the Drawings

[0024] Figure 1 A schematic structural diagram showing an embodiment of the present invention.

[0025] Figure 2 A schematic diagram showing the position structure of adjacent pipe segments in the room temperature state in an embodiment of the present invention.

[0026] Figure 3 A schematic diagram showing the position structure of adjacent pipe segments in the cooling state in an embodiment of the present invention.

[0027] Figure 4 A schematic diagram showing the position structure of adjacent pipe segments in another embodiment of the present invention. Detailed Description of the Invention

[0028] Embodiment 1

[0029] As Figure 1 shown, in a specific embodiment of a U-shaped retracting and deploying device for a high-temperature superconducting cable according to the present invention, a high-temperature superconducting cable 1 is threaded through a rigid U-shaped retracting and deploying device 2. The U-shaped retracting and deploying device 2 is generally made of a metal material. A section of the high-temperature superconducting cable is threaded through it, and there is a slight gap between the outer surface of the high-temperature superconducting cable and the inner hole of the U-shaped retracting and deploying device.

[0030] The U-shaped retracting and deploying device 2 of the present invention includes an arc-shaped pipe section 21, a first straight pipe section connected to one end of the arc-shaped pipe section 21, and a second straight pipe section connected to the other end of the arc-shaped pipe section 21.

[0031] The arc-shaped pipe section 21 is preferably a semi-circular arc, and the connection with the two straight pipe sections is at the tangent position of the circle, which can best retain (without decomposition) the tensile force when the cable contracts.

[0032] The arc-shaped pipe section 21 and the two directly connected straight pipe sections can be fixedly connected by welding, or can be a detachable fixed connection structure.

[0033] The first straight pipe section and the second straight pipe section are arranged in parallel and are respectively spliced in sequence by a plurality of pipe sections 22 with the same number; for example, both are three sections, or both are four sections, and so on.

[0034] Specifically, each pipe section 22 is composed of a sleeve part 221, a sleeve portion 222 and an L-shaped bracket 223 of an integral structure. The diameter of the sleeve part 221 is smaller than the diameter of the sleeve portion 222; so that the sleeve part 221 can be inserted into the adjacent cooperating sleeve portion 222.

[0035] As Figure 2 shown, in the installation state of the high-temperature superconducting cable, the high-temperature superconducting cable is at room temperature length. The sleeve portion 222 of a pipe section 22 and the sleeve part 221 of an adjacent another pipe section are sleeved inside and outside, and the two can be displaced relative to each other, and a certain empty stroke is reserved.

[0036] As Figure 3 shown, in the cooling state of the high-temperature superconducting cable, the high-temperature superconducting cable cools and contracts, and the sleeve portion 222 and the sleeved sleeve part 221 displace relative to each other within the distance range of the empty stroke to shorten the lengths of the first straight pipe section and the second straight pipe section to adapt to the length of the high-temperature superconducting cable after cooling and contraction.

[0037] In a specific embodiment, the L-shaped bracket 223 includes a horizontal plate 41 and a vertically arranged vertical plate 42. In particular, the vertical plate 42 is located between the sleeve part 221 and the sleeve portion 222 to avoid the situation that one end of each pipe section 22 is heavy and the other end is light, so that the gravity on the horizontal plate 41 is relatively balanced, which is beneficial to the relatively uniform distribution of the pressure of the horizontal plate 41 on the lower base 5.

[0038] Between the bottom surface of the cross plate 41 and the base 5 of the U-shaped retracting and deploying device 2, there can be two smooth surfaces, preferably a sliding connection.

[0039] Specifically, a chute is provided on the bottom surface of the cross plate 41, and a guide rail 51 is provided on the base 5; a sliding connection is provided between the guide rail and the chute.

[0040] Or in another embodiment, a guide rail is provided on the bottom surface of the cross plate 41, and a chute is provided on the base 5; a sliding connection is provided between the guide rail and the chute.

[0041] In the present invention, the U-shaped retracting and deploying device 2 further includes an auxiliary retracting device 6.

[0042] The auxiliary retracting device 6 includes an elastic body 61 and a prestress adjusting device 62. In a specific implementation, the elastic body 61 can be an elastic rubber band, a spring, or a tension spring; the prestress adjusting device 62 can be a manual hoist or an electric hoist.

[0043] One end of the elastic body 61 is connected to the arc-shaped pipe section 21, and the best connection position is at the arc vertex of the arc-shaped pipe section 21. The other end of the elastic body 61 is connected to the prestress adjusting device 62. Specifically, it is connected to the cable of the prestress adjusting device 62.

[0044] By continuously adjusting the length of the cable in the prestress adjusting device, the best tension of the elastic body 61 is found. This "best tension" is required to ensure that the U-shaped retracting and deploying device is not pulled at room temperature, and to give an "pull" (towards Figure 1 the upper right corner direction in the figure) auxiliary force to the arc-shaped pipe section 21 when the cable contracts during temperature drop, reducing the reaction force of the U-shaped retracting and deploying device on the high-temperature superconducting cable, and more helpful for protecting the cable from damage.

[0045] In a specific implementation, the thrust force during the movement of the sleeve part 222 acts on the vertical plate 42 of the L-shaped bracket 223 of the adjacent other pipe section. In this way, the contact surface between the two is relatively comprehensive and the thrust force is relatively evenly distributed.

[0046] Of course, if the relative lengths of the sleeve part 222 and the sleeve pipe part 221 are adjusted, with the sleeve part 222 being short and the sleeve pipe part 221 being long, then the thrust force during the movement of the sleeve part 222 can also act on the tail end of the sleeve pipe part 221, which is also acceptable.

[0047] Embodiment 2:

[0048] As Figure 4 shown in another embodiment of the present invention, which is basically the same as the above embodiment, the difference is that; there is a detachable limit screw 2221 on the cylinder body 2222 of the sleeve part 222; there is a convex edge 2211 at the tail end of the sleeve pipe part 221 to prevent the sleeve pipe part 221 from falling off from the sleeve part 222.

[0049] During assembly, the sleeve part 221 is first inserted into the cylinder body 2222, and then the limit screw 2221 is screwed onto the cylinder body 2222. In this way, the sleeve part 221 is arranged inside the cylinder body 2222 and has a certain moving stroke, and it will not fall off from the cylinder body 2222 during bidirectional displacement.

[0050] The beneficial effect of such a structure is that the U-shaped retracting and deploying device of the present invention is not only applicable to the cooling and contraction of high-temperature superconducting cables, but also applicable to the elongation of high-temperature superconducting cables during heating (such as during maintenance).

[0051] The working principle of the present invention:

[0052] The U-shaped retracting and deploying device of the present invention can make the length of the straight pipe section adapt to the length requirements of the high-temperature superconducting cable after cooling and telescoping through a number of pipe segments sleeved at the head and tail, meet the length change requirements of the high-temperature superconducting cable from room temperature installation to cooling operation, reduce the deformation stress of the high-temperature superconducting cable during temperature change, and ensure the use safety of the high-temperature superconducting cable during temperature change.

[0053] Due to the structural design of the chute and the guide rail, the U-shaped retracting and deploying device of the present invention, on the one hand, reduces the frictional resistance between the two and correspondingly reduces the reaction force of the retracting and deploying device on the cable. On the other hand, when the high-temperature superconducting cable is in a state where the contraction forces on both sides of the U-shaped section are uneven (generally speaking, the contractions on both sides of the U-shaped section of the high-temperature superconducting cable cannot reach complete synchronization, resulting in unequal contraction forces on both sides), the two straight pipe sections can contract synchronously without deviation due to the existence of the guide rail, and always maintain the parallelism of the two straight pipe sections, reducing the damage to the high-temperature superconducting cable.

[0054] Due to the setting of the auxiliary contraction device, the U-shaped retracting and deploying device of the present invention, through the adjustment of empirical data, does not contract when the high-temperature superconducting cable is in the room temperature installation state; while when the high-temperature superconducting cable cools and contracts, the auxiliary contraction device provides an auxiliary acting force for the displacement of the straight pipe section in the U-shaped retracting and deploying device, further reducing the damage to the high-temperature superconducting cable.

[0055] The present invention improves the reaction force of the U-shaped retracting and deploying device on the length deformation of the high-temperature superconducting cable during the process of the high-temperature superconducting cable changing from the room temperature installation state to the cooling use state, and ensures the use safety of the high-temperature superconducting cable during the cooling use process.

[0056] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative labor. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field of the present invention through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. U-shaped retractable device for high-temperature superconducting cable, the high-temperature superconducting cable is threaded through the rigid U-shaped retractable device; the U-shaped retractable device includes an arc-shaped pipe section, a first straight pipe section connected to one end of the arc-shaped pipe section, and a second straight pipe section connected to the other end of the arc-shaped pipe section; characterized in that : The first straight pipe section and the second straight pipe section are respectively formed by sequentially splicing a number of pipe sections with the same quantity; Each of the pipe sections is composed of a sleeve part, a socket part and an L-shaped bracket which are of an integral structure; the diameter of the sleeve part is smaller than that of the socket part; In the installation state of the high-temperature superconducting cable, the socket part of one pipe section is sleeved with the sleeve part of another pipe section spliced in sequence and a certain empty stroke is reserved; In the cooling state of the high-temperature superconducting cable, the high-temperature superconducting cable cools and shrinks, and the socket part and the sleeved sleeve part have relative displacement within the distance range of the empty stroke, so as to shorten the lengths of the first straight pipe section and the second straight pipe section to adapt to the length of the high-temperature superconducting cable; The bottom surface of the horizontal plate of the L-shaped bracket is in sliding connection with the base carrying the U-shaped winding and unwinding device; The U-shaped winding and unwinding device further includes an auxiliary contraction device; the auxiliary contraction device includes an elastic body and a prestress adjusting device; one end of the elastic body is connected with the arc-shaped pipe section; the other end of the elastic body is connected with the prestress adjusting device.

2. The U-shaped retracting and deploying device for high-temperature superconducting cables according to claim 1, characterized in that, The barrel of the socket part is provided with a detachable limit screw; the tail end of the sleeve part has a convex edge; the sleeve part has a certain moving stroke in the socket part and will not fall off from the socket part.

3. The U-shaped retracting and deploying device for a high-temperature superconducting cable according to claim 1, wherein The thrust force during the movement of the socket part acts on the vertical plate of the L-shaped bracket of another pipe section spliced in sequence.

4. The U-shaped retracting and deploying device for high-temperature superconducting cables according to claim 1, wherein The bottom surface of the horizontal plate of the L-shaped bracket is provided with a chute and the base is provided with a guide rail; or the bottom surface of the horizontal plate of the L-shaped bracket is provided with a guide rail and the base is provided with a chute; the guide rail and the chute are in sliding connection.

5. The U-shaped retracting and deploying device for high-temperature superconducting cables according to any one of claims 1 to 4, characterized in that, The elastic body is an elastic rubber band or a spring or a tension spring.

6. The U-shaped retracting and deploying device for high-temperature superconducting cables according to claim 5, characterized in that, The prestress adjusting device is a manual hoist or an electric hoist.

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