High-temperature superconducting coil thermal control switch device

Abstract

The invention discloses a high-temperature superconducting coil thermal control switch device, which relates to the field of superconducting magnet coil closed loop and comprises a cold guide plate, a coil framework, a high-temperature superconducting coil and a heating component, the coil framework is mounted on the cold guide plate, and the heating component is attached to the high-temperature superconducting coil and used for heating the high-temperature superconducting coil. The high-temperature superconducting coil is attached to the cold guide plate and comprises a high-temperature superconducting belt; when the coil is wound, the middle section of the high-temperature superconducting tape is firstly placed in the middle path in the center of the coil framework, then the two ends of the high-temperature superconducting tape are attached to the two special-shaped winding edges respectively and stretch out reversely and are wound on the periphery of the coil framework, and due to the reverse winding structure, when current flows in the coil, the directions of generated magnetic fields are opposite; therefore, the design of'non-inductive 'or extremely low inductive reactance is realized, the parasitic inductance and the leakage magnetic field in the switching process of the thermal control switch are obviously reduced, and the electromagnetic disturbance to the main magnet becomes smaller.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of superconducting magnet coil closed loop, and particularly relates to a high-temperature superconducting coil thermal control switch device. BACKGROUND

[0002] High-temperature superconducting coils have been widely used in energy storage, power, medical imaging, accelerators and high-end scientific research devices and other fields due to their low loss, high current density and other advantages. With the complexity and scale of high-temperature superconducting magnet engineering, flexible control of the magnet loop has become an important technical link to ensure system safety and improve operating efficiency. Realizing closed loop control of the high-temperature superconducting coil has become an indispensable key function in superconducting magnet engineering.

[0003] The thermal control type superconducting switch is generally composed of a superconducting coil and a heating device. The superconducting coil is wound by superconducting wire. By heating the device, the temperature of the superconducting wire is higher than the critical temperature, and the superconducting switch changes from the superconducting state to the normal state. After stopping heating, the superconducting switch is cooled by a liquid to reduce the temperature below the critical temperature, thereby recovering from the normal state to the superconducting state.

[0004] In existing engineering practice, closed loop control is mostly dependent on mechanical or parametric switches and other devices. However, the leads of such devices inevitably produce parasitic inductance and external magnetic fields, which are easy to couple with the main magnet and cause interference. In fast magnetization, magnet holding and demagnetization and other dynamic conditions, it often shows response delay, insufficient stability and limited repeatability. SUMMARY

[0005] In order to overcome the above technical problems, the purpose of the present application is to provide a high-temperature superconducting coil thermal control switch device.

[0006] The purpose of the present application can be realized by the following technical solutions: A high-temperature superconducting coil thermal control switch device, comprising: a cold plate, a coil skeleton, a high-temperature superconducting coil and a heating assembly; The coil skeleton is installed on the cold plate, the heating assembly includes a heating sheet for heating the high-temperature superconducting coil, the high-temperature superconducting coil is attached to the cold plate, and the high-temperature superconducting coil includes a high-temperature superconducting tape. The coil skeleton includes a middle path at the center of the coil skeleton and two irregularly shaped winding edges that are centrally symmetric around the middle path, the middle section of the high-temperature superconducting tape is placed on the middle path, and the two ends of the high-temperature superconducting tape are configured to reversely extend and wind around the periphery of the coil skeleton to realize inductance.

[0007] As a further scheme of the present application, the special-shaped winding edge comprises a semicircular edge and a circular arc edge adjacent to the semicircular edge, the semicircular edge and the circular arc edge are smoothly connected, two circular arc edges form an outer contour of the coil former, the outer contour of the coil former is a polygonal circle, and the high-temperature superconducting tape is wound in a single-pie shape.

[0008] As a further scheme of the present application, the coil former comprises two center-symmetrical support blocks, the intermediate path is located at the center of symmetry of the two support blocks, the two semicircular edges are located at the opposite positions of the two support blocks, an S-shaped winding path is formed between the two support blocks, and the two circular arc edges are located at the opposite positions of the two support blocks.

[0009] As a further scheme of the present application, at least one mounting groove is formed in the support block, a screw rod is inserted into the mounting groove and is screwed with the cooling plate to mount the support block to the cooling plate.

[0010] As a further scheme of the present application, the heating sheet is attached to the cooling plate.

[0011] As a further scheme of the present application, the heating sheet is attached to the high-temperature superconducting coil. The heating assembly further comprises a mounting member which is detachably mounted to the cooling plate through a bolt, a clamping groove one is formed in the mounting member, the heating sheet is arranged in the clamping groove one, at least one clamping groove two is formed in the mounting member, and a thermometer is arranged in the clamping groove two, the thermometer is used to measure the temperature of the high-temperature superconducting tape.

[0012] As a further scheme of the present application, the cooling plate comprises two parallel straight edges, and a semicircular edge connected to the same side end of the two straight edges, and the center point of the coil former coincides with the center point of the semicircular edge.

[0013] As a further scheme of the present application, the cooling plate is made of T2 copper material.

[0014] As a further scheme of the present application, one side of the cooling plate facing the high-temperature superconducting tape is attached with an insulating material, and the surface of the coil former is also attached with the insulating material.

[0015] As a further scheme of the present application, the high-temperature superconducting coil comprises a plurality of parallel high-temperature superconducting tapes, and an insulating tape is arranged between the high-temperature superconducting tapes.

[0016] The beneficial effects of the present application are: when it is needed to disconnect the superconducting coil loop, the heating assembly is started to heat the high-temperature superconducting coil, the heat is transferred to the high-temperature superconducting tape constituting the coil, so that the local or overall temperature of the high-temperature superconducting tape is increased and exceeds the critical temperature, at this time, the superconducting tape loses superconductivity and presents high resistance, thereby effectively "turning off" the originally zero-resistance closed loop; when it is needed to restore the loop conduction, the heating is stopped, and the heat on the high-temperature superconducting tape can be quickly removed by the cooling plate, so that the temperature of the high-temperature superconducting coil is quickly reduced below the critical temperature, and the high-temperature superconducting coil recovers the superconducting state, the resistance disappears, and the loop is "turned on".

[0017] When winding the coil, the middle section of the high-temperature superconducting tape is first placed in the middle path at the center of the coil skeleton, and then the two ends of the high-temperature superconducting tape are reversely stretched and wound outside the periphery of the coil skeleton along the two special-shaped winding edges. This reverse winding structure makes the magnetic field directions opposite when the current flows in the coil, and the magnetic fields cancel each other out, thereby realizing the design of "zero inductance" or extremely low inductance, so that the parasitic inductance and the leakage magnetic field in the switching process of the thermal control switch are significantly reduced, and the electromagnetic disturbance to the main magnet becomes smaller. Secondly, the heating assembly is directly attached to the superconducting tape and forms an efficient and compact heat management path together with the cooling plate. Under the condition of accurately regulating the heating power or the temperature threshold, the opening and closing of the switch can be stably and repeatedly completed, which makes the superconducting state transition process more rapid and reliable, thereby overcoming the defects of the prior art, such as response delay, insufficient stability and poor repeatability under dynamic working conditions such as rapid magnetization, magnet holding and demagnetization. BRIEF DESCRIPTION OF DRAWINGS

[0018] The present application will be further described below with reference to the accompanying drawings.

[0019] Figure 1 is a schematic diagram of the wound high-temperature superconducting coil of the embodiment of the present application; Figure 2 is a front view of the coil skeleton of the embodiment of the present application; Figure 3 is a partial structure schematic diagram of the embodiment of the present application; Figure 4 is a structure schematic diagram of the cooling plate of the embodiment of the present application; Figure 5 is a partial structure schematic diagram of the high-temperature superconducting coil of the embodiment of the present application; Figure 6 is a structure schematic diagram of the coil skeleton of another embodiment of the present application.

[0020] Explanation of reference signs: 1, cooling guide plate; 2, coil framework; 3, high-temperature superconducting coil; 4, heating assembly; 21, middle path; 22, irregularly shaped winding edge; 31, high-temperature superconducting tape; 221, semicircular edge; 222, circular arc edge; 23, support block; 231, pointed end; 24, S-shaped winding path; 241, mounting groove; 41, heating sheet; 42, mounting member; 43, clamping groove I; 44, clamping groove II; 45, thermometer; 11, flat edge; 12, semicircular edge. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0022] Reference is made to Figures 1-2 and Figure 5 A high-temperature superconducting coil thermal control switch device according to an embodiment of the present application comprises a cooling guide plate 1, a coil framework 2, a high-temperature superconducting coil 3, and a heating assembly 4. The coil framework 2 is installed on the cooling guide plate 1, and the heating assembly 4 comprises a heating sheet for heating the high-temperature superconducting coil 3. The high-temperature superconducting coil 3 is attached to the cooling guide plate 1 to facilitate heat dissipation of the high-temperature superconducting coil 3 by the cooling guide plate 1. The high-temperature superconducting coil 3 comprises a high-temperature superconducting tape 31. The coil framework 2 comprises a middle path 21 at the center of the coil framework 2 and two irregularly shaped winding edges 22 that are centrally symmetric around the middle path 21. A middle section of the high-temperature superconducting tape 31 is arranged on the middle path 21, and two ends of the high-temperature superconducting tape 31 are configured to reversely extend and wind around the periphery of the coil framework 2 to achieve zero inductance, respectively, with the two irregularly shaped winding edges 22.

[0023] Specifically, when it is necessary to disconnect the superconducting coil loop, the heating assembly 4 is started to heat the high-temperature superconducting coil 3. Heat is transferred to the high-temperature superconducting tape 31 constituting the coil, so that the local or overall temperature of the high-temperature superconducting tape 31 is increased and exceeds the critical temperature. At this time, the superconducting tape loses superconductivity and presents high resistance, thereby effectively “turning off” the originally zero-resistance closed loop. When it is necessary to restore the loop conduction, the heating is stopped, and the cooling guide plate 1 can quickly dissipate the heat on the high-temperature superconducting tape 31, so that the temperature of the high-temperature superconducting coil 3 is rapidly reduced below the critical temperature. The high-temperature superconducting coil 3 immediately restores the superconducting state, the resistance disappears, and the loop is “turned on”.

[0024] Further, when winding the coil, the middle section of the high-temperature superconducting tape 31 is placed in the middle path 21 at the center of the coil former 2, and then the two ends of the high-temperature superconducting tape 31 are respectively extended and wound on the periphery of the coil former 2 along the two special-shaped winding edges 22 in opposite directions. This opposite winding structure makes the magnetic field directions opposite when the current flows in the coil, and the magnetic fields cancel each other out, thereby achieving a design of "zero inductance" or extremely low inductance, so that the parasitic inductance and the leakage magnetic field during the switching process of the thermal control switch are significantly reduced, and the electromagnetic disturbance to the main magnet becomes smaller. Secondly, the heating assembly 4 is directly attached to the superconducting tape, and together with the cold plate 1 forms a high-efficiency and compact heat management path. Under the condition of accurately regulating the heating power or the temperature threshold, the opening and closing of the switch can be stably and repeatedly completed, which makes the superconducting state transition process more rapid and reliable, thereby overcoming the defects of the prior art, such as response delay, insufficient stability and poor repeatability under dynamic working conditions such as rapid magnetization, magnet holding and demagnetization.

[0025] Referring to Figures 1-2 Optionally, the special-shaped winding edge 22 includes a semicircular edge 221 and a circular arc edge 222 adjacent to the semicircular edge 221, and the semicircular edge 221 and the circular arc edge 222 are smoothly connected. The two circular arc edges 222 form the outer contour surface of the coil former 2, and the outer contour of the coil former 2 is a circular shape with a missing corner, and the high-temperature superconducting coil 3 is wound in a single-pie shape.

[0026] In this embodiment, the smooth transition between the semicircular edge 221 and the circular arc edge 222 can prevent the high-temperature superconducting tape 31 from being bent. After the high-temperature superconducting tape 31 is extended from the special-shaped winding coil and wound on the circular outer contour surface, the high-temperature superconducting tape 31 can also be wound in an arc shape, which avoids affecting the use performance and causing irreversible damage to the high-temperature superconducting tape 31.

[0027] In addition, the single-pie-shaped winding of the high-temperature superconducting coil 3 makes all the superconducting tapes in the same plane and directly contact with the cold plate 1, establishing the shortest and most uniform heat conduction path. This makes the cooling efficiency high when the switch needs to be closed, and the heat can be quickly conducted away by the cold plate 1, thereby accelerating the speed of the superconducting state recovery and improving the response frequency of the switch. When it needs to be disconnected, the heat generated by the heating assembly 4 can also be more evenly applied to the entire coil, avoiding local overheating or insufficient cooling. Furthermore, the single-pie structure is simpler and more compact than the double-pie structure, which reduces the winding complexity and the axial size of the coil.

[0028] Referring to Figures 1-2 and Figure 5Optionally, the coil former 2 comprises two support blocks 23 that are centrally symmetrical, the intermediate path 21 is located at the center of symmetry of the two support blocks 23, the two semicircular edges 221 are located at the opposite of the two support blocks 23, and the S-shaped winding path 24 is formed between the two support blocks 23. The width of the S-shaped winding path 24 is designed according to actual needs and is adapted to the width of the high-temperature superconducting coil 3 that needs to pass through the S-shaped winding path 24, so as to avoid the offset of the high-temperature superconducting coil 3 due to the slight disturbance of the magnetic field, and make the "inductance performance" of the high-temperature superconducting coil 3 more stable. The two arc edges 222 are located at the opposite of the two support blocks 23.

[0029] In this embodiment, the S-shaped winding path 24 ensures the reverse extension of the high-temperature superconducting tape 31, realizes inductance-free winding, and reduces inductance interference; the central symmetry design balances the mechanical stress and heat distribution, improves the structural stability and durability of the coil former 2, and is suitable for high-frequency switching operation.

[0030] Referring to Figure 6 Optionally, the support blocks 23 each have a sharp end 231 that can be adapted to the high-temperature superconducting coil 3 wound on the outer contour of the coil former 2. Through the design of the sharp end 231, the winding of the high-temperature superconducting coil 3 on the coil former 2 is more smooth.

[0031] Referring to Figure 3 Optionally, at least one mounting groove 241 is formed on the support block 23, and a screw rod is inserted into the mounting groove 241 and threadedly connected with the cold plate 1 to mount the support block 23 to the cold plate 1.

[0032] In this embodiment, the screw rod is threadedly connected with the cold plate 1, so that the support block 23 and the cold plate 1 are detachably connected, which is convenient for replacement and maintenance of the staff. Designing multiple mounting grooves 241 and using multiple screw rods to cooperate in mounting the support block 23 can also make the support block 23 more stably fixed on the cold plate 1.

[0033] Optionally, the heating sheet 41 is attached to the cold plate 1.

[0034] In this embodiment, the heating sheet 41 is directly attached to the cold plate 1, that is, attached to the side of the cold plate 1 away from the coil former. Since the high-temperature superconducting coil 3 in the present application is a single-pie coil and is attached to the cold plate 1, the heating sheet 1 can heat the whole high-temperature superconducting coil 3 through the cold plate 1, so that the whole high-temperature superconducting coil 3 loses superconductivity, avoiding the possibility of local overheating of the high-temperature superconducting coil 3 due to local loss of superconductivity

[0035] Referring to Figures 1-3Optionally, the heating sheet 41 is attached to the high-temperature superconducting coil 3, and the heating sheet is long to increase the range of attachment to the superconducting coil as much as possible; the heating assembly 4 further comprises a mounting member 42, which is detachably mounted on the cold-lead plate 1 by bolts, and the mounting member 42 is provided with a clamping groove one 43, and the heating sheet 41 is arranged in the clamping groove one 43; the mounting member 42 is provided with at least one clamping groove two 44, and the clamping groove two 44 is provided with a thermometer 45, and the thermometer 45 is used to measure the temperature of the high-temperature superconducting tape 31.

[0036] In the embodiment, the heating sheet 41 is directly attached to the high-temperature superconducting tape 31, which improves the heat transfer efficiency, makes the superconducting tape quickly reach the critical temperature, reduces the energy loss, improves the response speed of the switch, and the arrangement of the mounting member 42 facilitates the installation of the heating sheet 41 and the thermometer 45, and the detachable design facilitates the replacement and maintenance of the heating sheet 41 and the thermometer 45; the clamping groove one 43 is used to install the heating sheet 41, and the heating sheet 41 can be fixedly arranged in the clamping groove one 43 by using conventional methods such as gluing or clamping; the clamping groove two 44 is used to install the thermometer 45, and the thermometer 45 can be inserted into the clamping groove two 44; the thermometer 45 provides real-time temperature feedback, realizes accurate temperature control, avoids overheating or insufficient cooling, ensures that the switch operates within a safe temperature range, improves reliability and control accuracy, and also facilitates the staff to obtain intuitive temperature design

[0037] Preferably, the two clamping grooves one 43 are symmetrically distributed on the mounting member 42, and the clamping groove one 43 is provided with a thermometer 45 for measuring the temperature of the coil at different positions, which improves the accuracy of temperature measurement.

[0038] Preferably, the thermometer 45 can also be directly attached to the position of the high-temperature superconducting coil 3 that needs to be measured to obtain more accurate temperature.

[0039] Referring to Figures 3-4 Optionally, the cold-lead plate 1 comprises two flat edges 11 arranged in parallel, and a semicircular edge 12 connected to the same side end of the two flat edges 11, and the center point of the coil former 2 coincides with the center point of the semicircular edge 12; one side of the clamping groove one 43 provided on the mounting member 42 is in the shape of a circular arc, and the heating sheet 41 is in the shape of a circular arc.

[0040] In the embodiment, through the special shape design of the cold-lead sheet and the clamping groove one 43, the structure of the whole device is more compact, unnecessary gaps are reduced, and a specific installation space in the shape of a ring is provided for the high-temperature superconducting coil 3, and the arc-shaped design of the heating sheet 41 can also improve the heat transfer efficiency of the heating sheet 41.

[0041] Optionally, the cold-lead plate 1 is made of T2 copper material.

[0042] In this embodiment, the T2 copper material is a kind of industrial pure copper with a high purity of 99.90% or above, belonging to the ordinary brass category, and is widely used in the fields of electric power, electronics, and mechanical manufacturing. The high thermal conductivity of T2 copper significantly improves the cooling efficiency, enabling the high-temperature superconducting tape 31 to quickly recover to the superconducting state after stopping heating, thereby shortening the switching time, improving the response frequency of the switch, and prolonging the service life of the switch.

[0043] Optionally, the side of the cooling plate 1 facing the high-temperature superconducting tape 31 is attached with insulating material on the surface of the coil former 2.

[0044] In this embodiment, the insulating material includes a polyimide insulating tape or other insulating adhesive tape with the same effect as PTFE, which is used to insulate the cooling plate 1 and the coil former 2 to ensure the insulation of the high-temperature superconducting coil 3 under cooling conditions.

[0045] Optionally, the high-temperature superconducting coil 3 includes a plurality of parallel-wound high-temperature superconducting tapes 31, and each of the high-temperature superconducting tapes 31 is parallel-wound with an insulating tape.

[0046] In this embodiment, the insulating tape ensures that each high-temperature superconducting tape works independently, avoiding mutual interference between adjacent high-temperature superconducting tapes, and further, parallel-winding multiple high-temperature superconducting tapes can increase the current carrying capacity of the superconducting closed loop.

[0047] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, and a particular orientation configuration and operation, therefore, it cannot be understood as a limitation on the present application. In addition, "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0048] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] The above has been described in detail one embodiment of the present application, but the content is only the preferred embodiment of the present application, cannot be considered for limiting the scope of the present application. Any equivalent changes and improvements made in the scope of the present application, should still belong to the scope of the present application.

Claims

1. A high temperature superconducting coil thermal control switch device, characterized by, The application relates to a high-temperature superconducting coil assembly. The coil framework (2) is installed on the cold conducting plate (1), the heating assembly (4) comprises a heating sheet (41) for heating the high-temperature superconducting coil (3), the high-temperature superconducting coil (3) is attached to the cold conducting plate (1), and the high-temperature superconducting coil (3) comprises a high-temperature superconducting tape (31). The coil framework (2) comprises a middle path (21) at the center of the coil framework (2) and two center-symmetrically arranged special-shaped winding edges (22) surrounding the middle path (21), the middle section of the high-temperature superconducting tape (31) is arranged on the middle path (21), and the two ends of the high-temperature superconducting tape (31) are configured to reversely extend and be wound on the periphery of the coil framework (2) to realize zero inductance. The special-shaped winding edge (22) comprises a semicircular edge (221) and a circular arc edge (222) adjacent to the semicircular edge (221), the semicircular edge (221) and the circular arc edge (222) are smoothly connected, the two circular arc edges (222) form the surrounding surface of the outer contour of the coil framework (2), the outer contour of the coil framework (2) is a lack-angle circular shape, and the high-temperature superconducting coil (3) is single-pie-shaped winding.

2. The high temperature superconducting coil thermal control switch device of claim 1, wherein, The coil framework (2) comprises two center-symmetrically arranged supporting blocks (23), the middle path (21) is located at the center of symmetry of the two supporting blocks (23), the two semicircular edges (221) are located at the opposite positions of the two supporting blocks (23), and the S-shaped winding path (24) is formed between the two supporting blocks (23).

3. The high temperature superconducting coil thermal control switch device of claim 2, wherein, At least one mounting groove (241) is formed in the supporting block (23), a screw rod is inserted into the mounting groove (241) and is threadedly connected with the cold conducting plate (1) to mount the supporting block (23) on the cold conducting plate (1).

4. The high temperature superconducting coil thermal control switch device of claim 3, wherein, The heating sheet (41) is attached to the cold conducting plate (1).

5. The high temperature superconducting coil thermal control switch device of claim 1, wherein, The heating sheet (41) is attached to the high-temperature superconducting coil (3).

6. The high temperature superconducting coil thermal control switch device of claim 1, wherein, The heating assembly (4) further comprises a mounting member (42) which is detachably mounted on the cold conducting plate (1) through bolts, a clamping groove I (43) is formed in the mounting member (42), the heating sheet (41) is arranged in the clamping groove I (43), at least one clamping groove II (44) is formed in the mounting member (42), a thermometer (45) is arranged in the clamping groove II (44), and the thermometer (45) is used for measuring the temperature of the high-temperature superconducting tape (31). The cold conducting plate (1) comprises two parallel flat edges (11) and a semicircular edge (12) connected to the same side end portions of the two flat edges (11), and the center point of the coil framework (2) is coincident with the center point of the semicircular edge (12).

7. A high temperature superconducting coil thermal control switch device according to claim 4 or 5 or 6, characterised in that, The cold conducting plate (1) is made of T2 copper material.

8. The high temperature superconducting coil thermal control switch device of claim 7, wherein, ​ 9. The high temperature superconducting coil thermal control switch device of claim 8, wherein, The one side of the cold conducting plate (1) facing the high temperature superconducting tape (31) is attached with insulating material on the surface of the coil former (2).

10. The high temperature superconducting coil thermal control switch device of claim 1, wherein, The high temperature superconducting coil (3) comprises a plurality of parallel wound high temperature superconducting tapes (31), and insulating tapes are wound between the high temperature superconducting tapes (31).

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