A closed high-temperature superconducting coil full-current operation device based on a mechanical iron core

Abstract

The present invention discloses a closed high-temperature superconducting coil full-current operation device based on a mechanical iron core, the device comprising a mechanical transmission device (1), an iron core structure and a high-temperature superconducting coil (3), wherein: the mechanical transmission device (1) is fixedly connected to the iron core structure, and the iron core structure realizes relative movement with the high-temperature superconducting coil (3) under the drive of the mechanical transmission device 1, thereby changing the inductance of the high-temperature superconducting coil (3), thereby increasing the energy storage time of the high-temperature superconducting coil (3). Compared with the prior art, the present invention can make the high-temperature superconducting closed coil in the full-current operation state of the high-temperature superconducting magnet and electromagnetic field system, thereby increasing the energy storage time and efficiency, and thus reducing the operation loss.

Description

Technical Field

[0001] The present invention relates to the field of high-temperature superconducting technology equipment, and in particular to a full-current operation device of a closed high-temperature superconducting coil in a high-temperature superconducting magnet and a magnetic field system. Background Art

[0002] High-temperature superconducting coils have a wide range of applications in strong magnetism and electricity, such as nuclear magnetic resonance and superconducting energy storage. At present, due to the multi-layer structure of high-temperature superconducting materials and the limitations of welding technology, closed high-temperature superconducting coils have joint resistance, which will generate a large amount of Joule heat loss when the high-temperature superconducting coils are in operation, which will greatly restrict the ability of high-temperature superconducting closed coils to operate at full current. At the same time, due to the characteristics of high-temperature superconducting materials, the loss caused by magnetic flux creep during the operation of high-temperature superconducting coils cannot be ignored, and this loss increases with the increase of current in the high-temperature superconducting coils, which also shortens the time for the high-temperature superconducting closed coils to operate at full current.

[0003] Existing methods for increasing the full current closed loop operation time of high temperature superconducting coils include: 1) reducing the joint resistance through resistance-free welding technology; 2) supplementing the current in the high temperature superconducting coil through high temperature superconducting flux pump wireless excitation technology, etc. However, due to the special coating structure of high temperature superconducting tapes, contact impedance will inevitably be generated during resistance-free welding, resulting in energy loss, which greatly limits the full current closed loop operation of high temperature superconducting coils. High temperature superconducting flux pump technology requires additional excitation equipment and precise magnetic field control conditions, so it is relatively complicated to implement, and the technology is not yet very mature.

[0004] Therefore, how to more efficiently, simply and flexibly improve the full current operation time of high-temperature superconducting coils and energy storage systems is a technical problem that technicians in this field currently need to solve. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and to propose a full-current operation method for a closed high-temperature superconducting coil based on a mechanical iron core, which effectively increases the full-current closed-loop operation time of the high-temperature superconducting coil by reducing the loss during the operation of the high-temperature superconducting coil.

[0006] The objective of the present invention is achieved through the following technical solutions:

[0007] A closed high-temperature superconducting coil full-current operation device based on a mechanical iron core, the device comprises a mechanical transmission device 1, an iron core structure and a high-temperature superconducting coil 3, wherein: the mechanical transmission device 1 is fixedly connected to the iron core structure, and the iron core structure realizes relative movement with the high-temperature superconducting coil 3 under the drive of the mechanical transmission device 1, thereby changing the inductance of the high-temperature superconducting coil 3, and then improving the energy storage time of the high-temperature superconducting coil 3.

[0008] The iron core structure adopts a non-closed connection iron core structure or an internal and external closed iron core connection structure.

[0009] The non-closed connection iron core structure includes an iron core, which is inserted into and removed from the high-temperature superconducting coil 3 under the drive of the mechanical transmission device 1.

[0010] The inner and outer closed core structure includes two cores and two mechanical transmission devices, and the two mechanical transmission devices are respectively arranged on both sides of the two cores; the two cores are moved into the high-temperature superconducting coil 3 under the drive of a pair of mechanical transmission devices. When the high-temperature superconducting coil 3 is inserted, the two cores are connected to form a closed magnetic circuit, thereby greatly increasing the inductance of the high-temperature superconducting coil 3; when the core is moved out of the high-temperature superconducting coil, the two cores move in opposite directions, and the closed connection is disconnected at this time.

[0011] The iron core is formed by stacking silicon steel sheets.

[0012] Under the condition that the size of the high temperature superconducting coil 3 allows, the iron core 2 with a large cross-sectional area is selected, so that

[0013] The inductance of the high temperature superconducting coil 3 is increased.

[0014] Compared with the prior art, the present invention can enable the high-temperature superconducting closed coil to be in a full-current operating state in the high-temperature superconducting magnet and electromagnetic field system, thereby improving energy storage time and efficiency, and thus reducing operating losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a specific embodiment 1 of a closed high-temperature superconducting coil full-current operation method based on a mechanical iron core of the present invention;

[0016] Figure 2 It is a structural schematic diagram of a specific embodiment 2 of a full-current operation method of a closed high-temperature superconducting coil based on a mechanical iron core of the present invention.

[0017] Reference numerals:

[0018] 1. Mechanical transmission device; 2. Iron core; 3. High-temperature superconducting coil; 4. Fixed part. DETAILED DESCRIPTION

[0019] The technical solution and specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings and embodiments.

[0020] like Figure 1As shown, it is a structural schematic diagram of a specific embodiment of a closed high-temperature superconducting coil full-current operation device based on a mechanical iron core of the present invention. This embodiment adopts a non-closed connection iron core structure, specifically including a mechanical transmission device 1, an iron core 2 and a high-temperature superconducting coil 3; the iron core 2 is fixed on the mechanical transmission device 1, and the fixed part 4 used to connect the iron core 2 and the mechanical transmission device 1 is made of non-magnetic conductive material. When in use, the high-temperature superconducting coil 3 is inserted to the left and moved to the right to be removed under the drive of the mechanical transmission device 1. The position of the iron core 2 is precisely controlled by controlling the mechanical transmission device 1. The iron core 2 is cylindrical and is made of laminated silicon steel sheets, which can reduce hysteresis and eddy current losses and ensure good magnetic conductivity. Of course, in other embodiments, the iron core can also be made of other shapes and other materials with good magnetic conductivity.

[0021] like Figure 2 As shown, a structural schematic diagram of a specific embodiment 2 of a closed high-temperature superconducting coil full-current operation device based on a mechanical iron core of the present invention is shown. This embodiment adopts an internal and external closed iron core connection structure, specifically including a pair of mechanical transmission devices 1, a pair of iron cores 2 and a superconducting coil 3. A pair of mechanical transmission devices 1 are respectively arranged on both sides of a pair of iron cores 2. Similarly, the iron core 2 is fixed on the mechanical transmission device 1, and a non-magnetic material is used for the fixed part 4 connecting the iron core 2 and the mechanical transmission device 1. When in use, the left and right iron cores 2 are moved into the high-temperature superconducting coil 3 under the drive of the mechanical transmission device 1, and finally closed to form a U-shaped closed iron core loop. By controlling a pair of mechanical transmission devices 1, the position of a pair of iron cores 2 is accurately controlled to ensure that a pair of iron cores 2 slowly contact when closed.

[0022] The iron core 2 is moved into the high temperature superconducting coil (3) to increase the inductance of the high temperature superconducting coil 3, so that the current in the high temperature superconducting coil 3 decreases; conversely, when the internal magnetic field of the superconducting coil 3 needs to be used, the iron core 2 is moved out of the high temperature superconducting coil 3 to reduce the inductance of the high temperature superconducting coil 3, so that the current in the high temperature superconducting coil 3 increases.

[0023] Preferably, the iron core 2 inserted into the high-temperature superconducting coil is arranged to be closed inside and outside to form a closed magnetic circuit, thereby increasing the inductance of the superconducting coil.

[0024] Preferably, the iron core is made of laminated silicon steel sheets to reduce the loss of the entire process.

[0025] Preferably, if the size of the high-temperature superconducting coil allows, an iron core with a larger cross-sectional area is selected as much as possible to increase the inductance of the superconducting coil.

[0026] The expression of the stored energy of the closed-loop operating current of the high-temperature superconducting coil 3 is as follows:

[0027]

[0028] This formula shows that as the inductance L of the high-temperature superconducting coil changes, the current therein will change.

[0029] According to the current attenuation formula in the superconducting coil, the expression is as follows:

[0030]

[0031] This formula shows that the larger the value of the inductance L is, the greater the current in the superconducting coil will be delayed.

[0032] When the energy stored in the high-temperature superconducting coil is constant, if an iron core is moved into the high-temperature superconducting coil to increase its inductance, the current in the superconducting coil will decrease; conversely, if the iron core is removed from the superconducting coil and its inductance is reduced, the current in the superconducting coil will increase.

[0033] It should be noted that when an element is said to be "fixed" to another element, it may be directly on the other element or there may be an intermediate element. When an element is said to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0034] It should be noted that the directions or positional relationships indicated by the terms "center", "left", "right", "inside" and "outside" in the above description are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0035] The present invention makes up for the deficiency of the existing high-temperature superconducting coil in full-current operation capability, can improve the energy storage time of the high-temperature superconducting coil, and by adding an iron core to the high-temperature superconducting coil in full-current operation state, it plays the role of increasing the inductance of the high-temperature superconducting coil and reducing the current therein, which can effectively reduce the loss caused by the joint resistance and magnetic flux creep in the high-temperature superconducting coil. The method is simple and easy to operate, and can significantly improve the application prospects of superconducting coils in the fields of superconducting magnets and superconducting energy storage.

[0036] The above embodiments are used to help understand the principles and technical solutions of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications fall within the scope of protection of the claims of the present invention.

Claims

1. A closed high temperature superconducting coil full current operation device based on a mechanical iron core, characterized in that: The device comprises a mechanical transmission device (1), an iron core structure and a high-temperature superconducting coil (3), wherein: the mechanical transmission device (1) is fixedly connected to the iron core structure; the iron core structure, driven by the mechanical transmission device (1), realizes relative movement with the high-temperature superconducting coil (3), thereby changing the inductance of the high-temperature superconducting coil (3); the iron core structure moves into the high-temperature superconducting coil (3), increasing the inductance of the high-temperature superconducting coil (3) and reducing the current; the iron core structure moves out of the high-temperature superconducting coil, reducing the inductance of the high-temperature superconducting coil (3) and increasing the current, thereby improving the full-current closed-loop operation time of the high-temperature superconducting coil (3).

2. A closed high temperature superconducting coil full current operation device based on a mechanical iron core as claimed in claim 1, characterized in that: The iron core structure adopts a non-closed connection iron core structure or an internal and external closed iron core connection structure.

3. A closed high temperature superconducting coil full current operation device based on a mechanical iron core as claimed in claim 2, characterized in that: The non-closed connection iron core structure comprises an iron core which is driven by a mechanical transmission device 1 to move into and out of the high-temperature superconducting coil (3).

4. A closed high temperature superconducting coil full current operation device based on a mechanical iron core as claimed in claim 3, characterized in that: The inner and outer closed iron core structure comprises two iron cores and two mechanical transmission devices, wherein the two mechanical transmission devices are respectively arranged on the two sides of the two iron cores; the two iron cores are moved into the high-temperature superconducting coil (3) under the drive of a pair of mechanical transmission devices; when the two iron cores are moved into the high-temperature superconducting coil (3), the two iron cores are connected to form a closed magnetic circuit, thereby greatly increasing the inductance of the high-temperature superconducting coil (3); when the iron cores are moved out of the high-temperature superconducting coil, the two iron cores move in opposite directions, and the closed connection is disconnected at this time.

5. A closed high temperature superconducting coil full current operation device based on a mechanical iron core as claimed in claim 1, characterized in that: The iron core is formed by stacking silicon steel sheets.

6. A closed high temperature superconducting coil full current operation device based on a mechanical iron core as claimed in claim 1, characterized in that: Under the condition that the size of the high-temperature superconducting coil (3) allows, an iron core (2) with a large cross-sectional area is selected to increase the inductance of the high-temperature superconducting coil (3).

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