Switchable field-configuration magnetically controlled crystal pulling superconducting magnet

Abstract

Disclosed in the present invention is a switchable field-configuration magnetically controlled crystal pulling superconducting magnet, comprising: a superconducting magnet main body and a rotation mechanism. The rotation mechanism is used for supporting the superconducting magnet main body and allowing the superconducting magnet main body to rotate on the vertical plane. The superconducting magnet main body comprises: a magnetic shielding vacuum chamber, a thermal radiation shield, a first superconducting coil, a second superconducting coil, pull rods, a cryocooler, current leads, and a superconducting power supply; the first superconducting coil and the second superconducting coil are two annular coils distributed opposite to each other and are both arranged in the thermal radiation shield; and the superconducting power supply is switchably electrically connected to the first superconducting coil and the second superconducting coil by means of the current leads, so that the first superconducting coil and the second superconducting coil are connected in either forward series or reverse series. The present application achieves switching among three magnetic field configurations of the superconducting magnet and improvement of the crystal pulling production efficiency by means of the rotation mechanism allowing the superconducting magnet main body to rotate on the vertical plane in combination with the switchable series-connection modes of the first superconducting coil and the second superconducting coil.

Description

A switchable field-shaped magnetized crystal-pulling superconducting magnet Technical Field

[0001] The present invention relates to the technical field of magnet equipment, and in particular to a switchable field-shaped magnetically controlled crystal-pulling superconducting magnet. Background Art

[0002] Currently, conventional superconducting magnets for magnetized crystal pulling are classified by magnetic field type into vertical, horizontal, and CUSP (curved) fields. However, a single superconducting magnet can only meet one fixed magnetic field type and cannot switch between them. This requires different superconducting magnets to produce different types of crystal pulling products, resulting in high costs and low production efficiency. Therefore, research on magnetic field switching in superconducting magnets is needed.

[0003] In the prior art, patent publication number CN116798724A, "A Superconducting Magnet, Magnetically Controlled Single Crystal Pulling Equipment, and Control Method," alters the connection between the current leads and the coils. A superconducting power supply inputs excitation current to each coil, adjusting the magnetic field generated by each coil as needed. This not only generates different magnetic fields (CUSP, hook-shaped, and perpendicular fields), but also achieves adjustable magnetic field distribution.

[0004] However, the above-mentioned existing technology can only realize the switching between two magnetic field types of CUSP hook field and vertical field. When producing crystal pulling products that require horizontal field, it is still necessary to additionally equip and replace horizontal field superconducting magnets, and the crystal pulling production efficiency is low. Summary of the Invention

[0005] The present invention provides a switchable field-shaped magnetized crystal-pulling superconducting magnet, which is used to solve the problems in the prior art of lack of reliable magnetic field type switching for superconducting magnets and low crystal pulling production efficiency.

[0006] In one aspect, the present invention provides a switchable field-shape magnetron crystal pulling superconducting magnet, comprising: a superconducting magnet body and a rotating mechanism.

[0007] The rotating mechanism is used to support the superconducting magnet body and allows the superconducting magnet body to rotate on a vertical plane.

[0008] The superconducting magnet body comprises: a magnetic shielding vacuum chamber, a cold screen, a first superconducting coil, a second superconducting coil, a pull rod, a refrigerator, a current lead and a superconducting power supply.

[0009] The cold shield is arranged inside the magnetic shielding vacuum chamber.

[0010] The first superconducting coil and the second superconducting coil are two relatively distributed annular coils, both of which are arranged inside the cold shield.

[0011] The pull rods respectively fix the cold shield, the first superconducting coil, and the second superconducting coil inside the magnetic shielding vacuum chamber.

[0012] The refrigerator is fixedly arranged on the top of the magnetic shielding vacuum chamber and is connected to the cold shield, the first superconducting coil and the second superconducting coil in a cooling conductive manner.

[0013] The superconducting power supply is switchably electrically connected to the first superconducting coil and the second superconducting coil through the current lead, so that the first superconducting coil and the second superconducting coil are connected in forward series or reverse series.

[0014] In a possible implementation, the current lead includes: a positive electrode, a negative electrode, a first superconducting lead, a second superconducting lead, a third superconducting lead, and a fourth superconducting lead.

[0015] The superconducting power source is electrically connected to the positive electrode and the negative electrode respectively.

[0016] The positive electrode is electrically connected to one end of the first superconducting coil through the first superconducting lead.

[0017] The negative electrode is switchably electrically connected to the other end of the first superconducting coil and both ends of the second superconducting coil through the second superconducting lead, the third superconducting lead, and the fourth superconducting lead, so that the first superconducting coil and the second superconducting coil are connected in forward series or reverse series.

[0018] In a possible implementation, the negative electrode includes: a negative electrode upper portion, a negative electrode lower portion, and an insulating sleeve.

[0019] The insulating sleeve fixedly connects the upper portion of the negative electrode and the lower portion of the negative electrode.

[0020] The first superconducting lead and the second superconducting lead are electrically connected to both ends of the first superconducting coil, respectively. The third superconducting lead and the fourth superconducting lead are electrically connected to both ends of the second superconducting coil, respectively.

[0021] When the upper portion of the negative electrode is electrically connected to the third superconducting lead, and the lower portion of the negative electrode is electrically connected to the second superconducting lead and the fourth superconducting lead, the first superconducting coil and the second superconducting coil are connected in reverse series.

[0022] When the upper portion of the negative electrode is electrically connected to the fourth superconducting lead, and the lower portion of the negative electrode is electrically connected to the second superconducting lead and the third superconducting lead, the first superconducting coil and the second superconducting coil are connected in series in the forward direction.

[0023] In a possible implementation, the positive electrode and the negative electrode are both dynamically sealed to the top of the magnetic shielding vacuum chamber.

[0024] In a possible implementation, the rotating mechanism includes: a frame, a rotating shaft, a bearing seat, a positioning flange, and a positioning pin.

[0025] The frames are arranged on both sides of the magnetic shielding vacuum chamber.

[0026] The bearing seat is fixedly arranged on the frame.

[0027] The bearing seat is rotatably connected to the positioning flange via the rotating shaft.

[0028] The positioning flange is fixedly connected to the magnetic shielding vacuum chamber.

[0029] The positioning pin is fixedly arranged on the frame and faces the positioning flange.

[0030] In a possible implementation, the rotating mechanism further includes a reduction gearbox.

[0031] The reduction box is fixedly arranged on the frame and is rotatably connected to the rotating shaft.

[0032] In a possible implementation, the inner cylinder of the magnetic shielding vacuum chamber is two cross-orthogonal cylinders with equal diameters, the interior of which is a vacuum sealed environment, and the outer wall of which is made of magnetic conductive material.

[0033] In a possible implementation, the pull rod includes an axial pull rod and a radial pull rod.

[0034] The axial tie rods and the radial tie rods are used to fix the cold shield, the first superconducting coil, and the second superconducting coil inside the magnetic shielding vacuum chamber from an axial direction and a radial direction, respectively.

[0035] The switchable field-shaped magnetron crystal pulling superconducting magnet of the present invention has the following advantages:

[0036] The rotating mechanism allows the superconducting magnet body to rotate on the vertical plane, and the switchable series connection of the first superconducting coil and the second superconducting coil realizes the switching of three magnetic field types of the superconducting magnet, thereby improving the crystal pulling production efficiency.

[0037] The negative pole is dynamically sealed with the top of the magnetic shielding vacuum chamber, and the electrical connection with the first superconducting coil and the second superconducting coil can be switched by rotating the negative pole, which is simple to operate and highly reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] FIG1 is a perspective schematic diagram of a first working station of a switchable field-shape magnetron crystal pulling superconducting magnet provided by an embodiment of the present invention;

[0040] FIG2 is a perspective schematic diagram of a second working station of a switchable field-shape magnetron crystal pulling superconducting magnet provided by an embodiment of the present invention;

[0041] FIG3 is a schematic diagram of the main structure of a CUSP hook-shaped field in the first station of a switchable field shape magnetron crystal pulling superconducting magnet provided by an embodiment of the present invention;

[0042] FIG4 is a schematic diagram of a vertical field main structure of a first station of a switchable field-shape magnetron crystal pulling superconducting magnet provided by an embodiment of the present invention;

[0043] FIG5 is a schematic diagram of a horizontal field main view structure of a second station of a switchable field shape magnetron crystal pulling superconducting magnet provided by an embodiment of the present invention;

[0044] FIG6 is a schematic structural diagram of a rotating mechanism provided in an embodiment of the present invention;

[0045] FIG7 is a schematic diagram of electrical connection between a current lead and a superconducting coil according to an embodiment of the present invention;

[0046] FIG8 is another schematic diagram of electrical connection between the current lead and the superconducting coil provided by an embodiment of the present invention. Description of Reference Numerals

[0047] 1-superconducting magnet body, 101-magnetic shielding vacuum chamber, 102-cold shield, 1031-first superconducting coil, 1032-second superconducting coil, 1041-axial pull rod, 1042-radial pull rod, 105-refrigerator, 106-current lead, 1061-positive pole, 1062-negative pole, 10621-negative pole upper part, 10622-negative pole lower part, 10623-insulating sleeve, 10631-first superconducting lead, 10632-second superconducting lead, 10633-third superconducting lead, 10634-fourth superconducting lead, 107-superconducting power supply, 2-rotating mechanism, 201-frame, 202-reduction gearbox, 203-rotating shaft, 204-bearing seat, 205-positioning flange, 206-positioning pin, 3-crucible. DETAILED DESCRIPTION

[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0049] As shown in FIG. 1 to FIG. 8 , an embodiment of the present invention provides a switchable field-shape magnetron crystal pulling superconducting magnet, comprising: a superconducting magnet body 1 and a rotating mechanism 2 .

[0050] The rotating mechanism 2 is used to support the superconducting magnet body 1 and allow the superconducting magnet body 1 to rotate on a vertical plane.

[0051] The superconducting magnet body 1 includes: a magnetic shielding vacuum chamber 101 , a cold shield 102 , a first superconducting coil 1031 , a second superconducting coil 1032 , a pull rod, a refrigerator 105 , a current lead 106 and a superconducting power supply 107 .

[0052] The cold shield 102 is disposed inside the magnetic shielding vacuum chamber 101 .

[0053] The first superconducting coil 1031 and the second superconducting coil 1032 are two relatively distributed annular coils, both of which are arranged inside the cold shield 102 .

[0054] The pull rods respectively fix the cold shield 102 , the first superconducting coil 1031 , and the second superconducting coil 1032 inside the magnetic shielding vacuum chamber 101 .

[0055] The refrigerator 105 is fixedly mounted on the top of the magnetic shielding vacuum chamber 101 and is connected to the cold shield 102 , the first superconducting coil 1031 , and the second superconducting coil 1032 in a cooling conductive manner.

[0056] The superconducting power supply 107 is switchably electrically connected to the first superconducting coil 1031 and the second superconducting coil 1032 through the current lead 106 , so that the first superconducting coil 1031 and the second superconducting coil 1032 are connected in forward series or reverse series.

[0057] Specifically, the primary cold head of the refrigerator 105 is connected to the cold shield 102 in a conductive manner, and the secondary cold head of the refrigerator 105 is connected to the first superconducting coil 1031 and the second superconducting coil 1032 in a conductive manner.

[0058] In this embodiment, the process of evacuating and cooling the superconducting magnet is as follows: the air inlet and outlet of the refrigerator 105 are connected to the compressor through a helium hose, and a vacuum pump group is used to evacuate the magnetic shielding vacuum chamber 101. When the vacuum degree is lower than 10 -3Pa, the vacuum pump group is removed, and the refrigerator 105 is turned on to cool the first superconducting coil 1031 and the second superconducting coil 1032 to below 4K.

[0059] In this embodiment, the process of realizing the CUSP hook field in the first working position of the superconducting magnet is as follows: the superconducting magnet body 1 is rotated so that the Y direction is perpendicular to the ground and the X direction is parallel to the ground. At this time, it is the first working position. The series connection mode of the first superconducting coil 1031 and the second superconducting coil 1032 is adjusted to reverse series connection. The superconducting power supply 107 is energized at a constant speed and remains stable when the working current is reached. As shown in FIG3 , the crucible 3 in the superconducting magnet body 1 is in the CUSP hook field.

[0060] In this embodiment, the vertical field implementation process of the first working position of the superconducting magnet is as follows: the Y direction of the superconducting magnet body 1 is kept perpendicular to the ground, and the X direction is parallel to the ground. At this time, it is still the first working position. The superconducting magnet is demagnetized, and the series connection mode of the first superconducting coil 1031 and the second superconducting coil 1032 is adjusted to a forward series connection. The superconducting power supply 107 is energized at a constant speed and remains stable when the working current is reached. As shown in Figure 4, the crucible 3 in the superconducting magnet body 1 is now in the vertical field.

[0061] In this embodiment, the second working position horizontal field implementation process of the superconducting magnet is as follows: keep the series connection mode of the first superconducting coil 1031 and the second superconducting coil 1032 in the forward series connection, rotate the superconducting magnet body 1 so that the Y direction is parallel to the ground and the X direction is perpendicular to the ground. At this time, it is the second working position, as shown in Figure 5. At this time, the crucible 3 in the superconducting magnet body 1 is in the horizontal field.

[0062] Illustratively, the current lead 106 includes: a positive electrode 1061 , a negative electrode 1062 , a first superconducting lead 10631 , a second superconducting lead 10632 , a third superconducting lead 10633 , and a fourth superconducting lead 10634 .

[0063] The superconducting power supply 107 is electrically connected to the positive electrode 1061 and the negative electrode 1062 respectively.

[0064] The positive electrode 1061 is electrically connected to one end of the first superconducting coil 1031 through the first superconducting wire 10631 .

[0065] The negative electrode 1062 is switchably electrically connected to the other end of the first superconducting coil 1031 and both ends of the second superconducting coil 1032 through the second superconducting lead 10632, the third superconducting lead 10633, and the fourth superconducting lead 10634, so that the first superconducting coil 1031 and the second superconducting coil 1032 are connected in forward series or reverse series.

[0066] Specifically, the first superconducting lead 10631, the second superconducting lead 10632, the third superconducting lead 10633, and the fourth superconducting lead 10634 are all high-temperature superconducting leads, which do not generate a thermal load on the first-stage cold head of the refrigerator 105. The positive electrode 1061 and the negative electrode 1062 are two normal conductors. Compared with the four normal conductors required for conventional electrical connections, these two normal conductors are eliminated, reducing the thermal load on the first-stage cold head of the refrigerator 105 and thus lowering costs.

[0067] As shown in FIG7 and FIG8 , illustratively, the negative electrode 1062 includes: a negative electrode upper portion 10621 , a negative electrode lower portion 10622 and an insulating sleeve 10623 .

[0068] The insulating sleeve 10623 securely connects the negative electrode upper portion 10621 and the negative electrode lower portion 10622 .

[0069] The first superconducting lead 10631 and the second superconducting lead 10632 are electrically connected to both ends of the first superconducting coil 1031 , respectively. The third superconducting lead 10633 and the fourth superconducting lead 10634 are electrically connected to both ends of the second superconducting coil 1032 , respectively.

[0070] When the negative electrode upper portion 10621 is electrically connected to the third superconducting lead 10633 and the negative electrode lower portion 10622 is electrically connected to the second superconducting lead 10632 and the fourth superconducting lead 10634 , the first superconducting coil 1031 and the second superconducting coil 1032 are connected in reverse series.

[0071] When the negative electrode upper portion 10621 is electrically connected to the fourth superconducting lead 10634 and the negative electrode lower portion 10622 is electrically connected to the second superconducting lead 10632 and the third superconducting lead 10633 , the first superconducting coil 1031 and the second superconducting coil 1032 are connected in series in the forward direction.

[0072] Exemplarily, the positive electrode 1061 and the negative electrode 1062 are both dynamically sealed to the top of the magnetic shielding vacuum chamber 101 .

[0073] Specifically, the negative electrode upper part 10621 and the negative electrode lower part 10622 are both provided with electrical connection contacts, and the switchable electrical connection between the negative electrode upper part 10621, the negative electrode lower part 10622 and the other end of the first superconducting coil 1031 and the two ends of the second superconducting coil 1032 is achieved by horizontally rotating the negative electrode 1062.

[0074] As shown in FIG6 , illustratively, the rotating mechanism 2 includes: a frame 201 , a rotating shaft 203 , a bearing seat 204 , a positioning flange 205 and a positioning pin 206 .

[0075] The racks 201 are disposed on both sides of the magnetic shielding vacuum chamber 101 .

[0076] The bearing seat 204 is fixedly mounted on the frame 201 .

[0077] The bearing seat 204 is rotatably connected to the positioning flange 205 via the rotating shaft 203 .

[0078] The positioning flange 205 is fixedly connected to the magnetic shielding vacuum chamber 101 .

[0079] The positioning pin 206 is fixedly mounted on the frame 201 and faces the positioning flange 205 .

[0080] Specifically, the positioning flange 205 is provided with four orthogonally distributed positioning pin holes, which are used for inserting the positioning pins 206 into the positioning pin holes when the superconducting magnet body 1 rotates to the first working position or the second working position to achieve position locking.

[0081] Exemplarily, the rotating mechanism 2 further includes a reduction gearbox 202 .

[0082] The reduction box 202 is fixedly mounted on the frame 201 and is rotatably connected to the rotating shaft 203 .

[0083] Specifically, the reduction box 202 can save effort and reduce speed. In this embodiment, the reduction box 202 is manually rotated by a worm gear. In other possible embodiments, gear transmission rotation, motor transmission rotation, etc. can also be used.

[0084] Exemplarily, the inner cylinder of the magnetic shielding vacuum chamber 101 is two cross-orthogonal cylinders with equal diameters, the interior of which is a vacuum sealed environment, and the outer wall of which is made of magnetic conductive material.

[0085] Exemplarily, the pull rod includes: an axial pull rod 1041 and a radial pull rod 1042 .

[0086] The axial tie rods 1041 and the radial tie rods 1042 are used to fix the cold shield 102 , the first superconducting coil 1031 , and the second superconducting coil 1032 inside the magnetic shielding vacuum chamber 101 from the axial direction and the radial direction, respectively.

[0087] In this embodiment, four axial tie rods 1041 and four radial tie rods 1042 are provided on the inner upper circumference and the inner lower circumference of the magnetic shielding vacuum chamber 101. In other possible embodiments, oblique tie rods and other numbers of tie rods may also be used.

[0088] The embodiment of the present invention realizes switching between three magnetic field types of the superconducting magnet through a rotating mechanism for rotating the superconducting magnet body on the vertical plane and a switchable series connection between the first superconducting coil and the second superconducting coil, thereby improving the crystal pulling production efficiency.

[0089] The negative pole is dynamically sealed with the top of the magnetic shielding vacuum chamber, and the electrical connection with the first superconducting coil and the second superconducting coil can be switched by rotating the negative pole, which is simple to operate and highly reliable.

[0090] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0091] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A switchable field-shaped magnetron crystal pulling superconducting magnet, characterized in that: include: Superconducting magnet body and rotating mechanism; The rotating mechanism is used to support the superconducting magnet body and allow the superconducting magnet body to rotate on the vertical plane; The superconducting magnet body includes: a magnetic shielding vacuum chamber, a cold screen, a first superconducting coil, a second superconducting coil, a pull rod, a refrigerator, a current lead and a superconducting power supply; The cold shield is arranged inside the magnetic shielding vacuum chamber; The first superconducting coil and the second superconducting coil are two relatively distributed annular coils, both of which are arranged inside the cold shield; The pull rods respectively fix the cold shield, the first superconducting coil, and the second superconducting coil inside the magnetic shielding vacuum chamber; The refrigerator is fixedly arranged on the top of the magnetic shielding vacuum chamber and is connected to the cold shield, the first superconducting coil and the second superconducting coil in a cold conductive manner; The superconducting power supply is switchably electrically connected to the first superconducting coil and the second superconducting coil through the current lead, so that the first superconducting coil and the second superconducting coil are connected in forward series or reverse series.

2. The switchable field-shape magnetron crystal pulling superconducting magnet according to claim 1, characterized in that: The current lead comprises: a positive electrode, a negative electrode, a first superconducting lead, a second superconducting lead, a third superconducting lead and a fourth superconducting lead; The superconducting power supply is electrically connected to the positive electrode and the negative electrode respectively; The positive electrode is electrically connected to one end of the first superconducting coil through the first superconducting lead; The negative electrode is switchably electrically connected to the other end of the first superconducting coil and both ends of the second superconducting coil through the second superconducting lead, the third superconducting lead, and the fourth superconducting lead, so that the first superconducting coil and the second superconducting coil are connected in forward series or reverse series.

3. The switchable field-shape magnetron crystal pulling superconducting magnet according to claim 2, characterized in that: The negative electrode comprises: a negative electrode upper part, a negative electrode lower part and an insulating sleeve; The insulating sleeve fixedly connects the upper portion of the negative electrode and the lower portion of the negative electrode; The first superconducting lead and the second superconducting lead are electrically connected to both ends of the first superconducting coil, respectively, and the third superconducting lead and the fourth superconducting lead are electrically connected to both ends of the second superconducting coil, respectively; When the upper portion of the negative electrode is electrically connected to the third superconducting lead, and the lower portion of the negative electrode is electrically connected to the second superconducting lead and the fourth superconducting lead, the first superconducting coil and the second superconducting coil are connected in reverse series; When the upper portion of the negative electrode is electrically connected to the fourth superconducting lead, and the lower portion of the negative electrode is electrically connected to the second superconducting lead and the third superconducting lead, the first superconducting coil and the second superconducting coil are connected in series in the forward direction.

4. The switchable field-shape magnetron crystal pulling superconducting magnet according to claim 2, characterized in that: The positive electrode and the negative electrode are both dynamically sealed and connected to the top of the magnetic shielding vacuum chamber.

5. The switchable field-shape magnetron crystal pulling superconducting magnet according to claim 1, characterized in that: The rotating mechanism includes: a frame, a rotating shaft, a bearing seat, a positioning flange and a positioning pin; The rack is arranged on both sides of the magnetic shielding vacuum chamber; The bearing seat is fixedly arranged on the frame; The bearing seat is rotatably connected to the positioning flange via the rotating shaft; The positioning flange is fixedly connected to the magnetic shielding vacuum chamber; The positioning pin is fixedly arranged on the frame and faces the positioning flange.

6. The switchable field-shape magnetron crystal pulling superconducting magnet according to claim 5, characterized in that: The rotating mechanism further includes: a reduction gearbox; The reduction box is fixedly arranged on the frame and is rotatably connected to the rotating shaft.

7. The switchable field-shape magnetron crystal pulling superconducting magnet according to claim 1, characterized in that: The inner cylinder of the magnetic shielding vacuum chamber is two cross-orthogonal cylinders with equal diameters, the interior of which is a vacuum sealed environment, and the outer wall of which is made of magnetic conductive material.

8. The switchable field-shape magnetron crystal pulling superconducting magnet according to claim 1, characterized in that: The pull rod includes: an axial pull rod and a radial pull rod; The axial tie rods and the radial tie rods are used to fix the cold shield, the first superconducting coil, and the second superconducting coil inside the magnetic shielding vacuum chamber from an axial direction and a radial direction, respectively.

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