Magnet structure beneficial to improving rigidity of conduction cooling type superconducting magnet coil framework

Abstract

The invention discloses a magnet structure beneficial to improving the rigidity of a conduction cooling type superconducting magnet coil framework, which comprises a main coil framework and two shielding coil frameworks connected to the two sides of the main coil framework respectively, and the outer side of the main coil framework is connected with a main coil framework reinforcing rib plate; the inner sides of the two shielding coil frameworks are connected with a plurality of shielding coil framework reinforcing rib plates, and all the shielding coil framework reinforcing rib plates are evenly distributed on the outer side of the main coil framework in the circumferential direction of the main coil framework. The coil end plate can be used for a magnet with low magnetic field intensity and a magnet with high magnetic field intensity, due to the fact that the reinforcing rib structure is used, the thickness of the coil end plate is reduced, the machining and manufacturing cost is remarkably reduced, and the weight is greatly reduced; the time interval of cooling to the superconducting temperature again after the superconducting magnet is quenched is shortened, the cooling time is shortened (within about 20 days), the production cost is further reduced, and the production period is remarkably shortened.

Description

Technical Field

[0001] The invention belongs to the technical field of medical imaging, and in particular relates to a magnet structure which is beneficial to improving the rigidity of a coil skeleton of a conduction-cooled superconducting magnet. Background Art

[0002] The structure of the conduction-cooled magnet currently on the superconducting magnetic resonance system (MRI) market is shown in the figure below, which consists of two shielding coils, a main coil and several connecting rods.

[0003] The magnetic field strength of the conduction-cooled magnet of this type of structure is relatively low. Since the coil end plates of the skeleton will undergo elastic deformation due to the magnetic field force, the skeleton requires very thick end plates and connecting rods to prevent elastic deformation.

[0004] This structure is barely applicable to magnets with low magnetic field strength, but it is heavy and the cooling time of the magnet is very long (about 30 days or more). Due to the use of the connecting rod structure, the shield coil end plate must be thickened to process the sinking hole for the fixing nut of the connecting rod. The reason why the nut sinks is due to the size and structure of the magnet. If it does not sink, the axial size of the magnet will increase, which will increase the weight of the magnet and increase the cooling time of the magnet.

[0005] For high-field strength magnets (above 1T), the magnetic field force will increase exponentially. If this structural form is still used, the skeleton deformation cannot meet the design requirements.

[0006] In summary, the defects of the prior art are as follows:

[0007] 1. The existing structure is only suitable for magnets with low magnetic field strength;

[0008] 2. The existing structure has a large magnet weight;

[0009] 3. The cooling time is very long (about 30 days or more);

[0010] 4. High production cost;

[0011] 5. Long production cycle;

[0012] 6. It takes a long time for a superconducting magnet to cool down to superconducting temperature after losing its superconductivity, resulting in great energy waste. Summary of the invention

[0013] The object of the present invention is to provide a magnet structure which is beneficial to improving the rigidity of the coil skeleton of a conduction-cooled superconducting magnet, so as to solve the above-mentioned problems existing in the prior art.

[0014] In order to achieve the above object, the present invention adopts the following technical solutions:

[0015] A magnet structure that is beneficial to improving the stiffness of the coil skeleton of a conduction-cooled superconducting magnet, including a main coil skeleton and two shielding coil skeletons respectively connected to both sides of the main coil skeleton. A main coil skeleton stiffening rib plate is connected to the outside of the main coil skeleton, and a plurality of shielding coil skeleton stiffening rib plates are connected to the inner sides of the two shielding coil skeletons. All the shielding coil skeleton stiffening rib plates are evenly distributed along the circumferential direction of the main coil skeleton on the outside of the main coil skeleton.

[0016] As a preferred technical solution in the present invention, both ends of each shielding coil skeleton stiffening rib plate are connected to the inner side of the corresponding shielding coil skeleton through a stiffening rib plate connecting plate.

[0017] As a preferred technical solution in the present invention, eight shielding coil skeleton stiffening rib plates are connected to the inner sides of the two shielding coil skeletons.

[0018] As a preferred technical solution in the present invention, a plurality of main coil skeleton stiffening rib plates evenly distributed along the circumferential direction of the main coil skeleton are connected to the outside of the main coil skeleton.

[0019] As a preferred technical solution in the present invention, the middle part of the main coil skeleton stiffening rib plate is connected to the main coil skeleton through a plurality of first bolts.

[0020] As a preferred technical solution in the present invention, the middle part of each main coil skeleton stiffening rib plate is connected to the main coil skeleton through six first bolts.

[0021] As a preferred technical solution in the present invention, both ends of the main coil skeleton stiffening rib plate are each connected to the main coil skeleton through a plurality of second bolts.

[0022] As a preferred technical solution in the present invention, both ends of the main coil skeleton stiffening rib plate are each connected to the main coil skeleton through three second bolts.

[0023] Beneficial effects: The present invention significantly increases the stiffness of the main coil skeleton by using the main coil skeleton stiffening rib plate, controls the coil position change caused by the skeleton deformation due to electromagnetic force, improves the magnetic field uniformity, significantly increases the stiffness of the shielding coil skeleton by using the shielding coil skeleton stiffening rib plate, controls the coil position change caused by the skeleton deformation due to electromagnetic force, improves the magnetic field uniformity, so that the magnet structure of the present invention can not only be used for magnets with lower magnetic field strength, but also for magnets with higher magnetic field strength, and is applicable to all field strength magnets. Due to the use of the stiffening rib structure, the thickness of the coil end plate is reduced and other structures change accordingly, resulting in a significant reduction in processing and manufacturing costs and a great reduction in weight. And due to the significant reduction in the overall weight, the time interval for the superconducting magnet to cool down to the superconducting temperature again after quenching becomes shorter, and the cooling time becomes shorter (within about 20 days), further reducing the production cost and significantly reducing the production cycle. Description of the Drawings

[0024] Figure 1 is a three-dimensional schematic diagram of the present invention;

[0025] Figure 2 is the front view of the present invention.

[0026] In the figure: 1 - main coil skeleton; 2 - shielding coil skeleton; 3 - reinforcing rib plate of main coil skeleton; 4 - reinforcing rib plate of shielding coil skeleton; 5 - connecting plate of reinforcing rib plates; 6 - first bolt; 7 - second bolt. Detailed Description of the Invention

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the present invention in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the drawing structures is only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. It should be noted here that the description of these embodiment modes is used to help understand the present invention, but does not constitute a limitation to the present invention.

[0028] Embodiment:

[0029] As shown in Figure 1 and Figure 2 , this embodiment provides a magnet structure that is beneficial to improving the stiffness of the coil skeleton of a conduction-cooled superconducting magnet, including a main coil skeleton 1 and two shielding coil skeletons 2 respectively connected to both sides of the main coil skeleton 1. A reinforcing rib plate 3 of the main coil skeleton is connected to the outside of the main coil skeleton 1, which can significantly increase the stiffness of the main coil skeleton 1. Preferably, a plurality of reinforcing rib plates 3 of the main coil skeleton are connected to the outside of the main coil skeleton 1 and are evenly distributed along the circumferential direction of the main coil skeleton 1, further increasing the stiffness of the main coil skeleton 1, controlling the coil position change caused by the skeleton deformation due to electromagnetic force, and improving the magnetic field uniformity. The connection method between the reinforcing rib plate 3 of the main coil skeleton and the main coil skeleton 1 is not limited to bolts, and other connection methods can also be used. A plurality of reinforcing rib plates 4 of the shielding coil skeleton are connected to the inner sides of the two shielding coil skeletons 2, and all the reinforcing rib plates 4 of the shielding coil skeleton are evenly distributed along the circumferential direction of the main coil skeleton 1 on the outside of the main coil skeleton 1, significantly increasing the stiffness of the shielding coil skeleton 2, controlling the coil position change caused by the skeleton deformation due to electromagnetic force, and improving the magnetic field uniformity.

[0030] The present invention significantly increases the stiffness of the main coil skeleton 1 by using the main coil skeleton reinforcing rib plate 3, controls the coil position change caused by the skeleton deformation due to electromagnetic force, improves the magnetic field uniformity, and significantly increases the stiffness of the shielding coil skeleton 2 by using the shielding coil skeleton reinforcing rib plate 4, controls the coil position change caused by the skeleton deformation due to electromagnetic force, improves the magnetic field uniformity, so that the magnet structure of the present invention can not only be used for magnets with lower magnetic field strength, but also for magnets with higher magnetic field strength, and is applicable to all field strength magnets. Due to the use of the reinforcing rib structure, the thickness of the coil end plate is reduced and other structures change accordingly, resulting in a significant reduction in the manufacturing cost and a great reduction in weight. And due to the significant reduction in the overall weight, the time interval for the superconducting magnet to cool down to the superconducting temperature again after quenching becomes shorter, and the cooling time is shortened to within about 20 days, further reducing the production cost and significantly reducing the production cycle.

[0031] As a preferred implementation in this embodiment, it should be further noted that both ends of each shielding coil skeleton reinforcing rib plate 4 are connected to the inner side of the corresponding shielding coil skeleton 2 through the reinforcing rib plate connecting plate 5. During installation, first weld the reinforcing rib plate connecting plate 5 to the inner side of the shielding coil skeleton (completed before skeleton processing), and then weld the shielding coil skeleton reinforcing rib plate 4 to the reinforcing rib plate connecting plate 5, evenly distributed in a circle. The welding process does not affect the stability of the shielding coil skeleton 2 and is more convenient for welding.

[0032] As a preferred implementation in this embodiment, it should be further noted that eight shielding coil skeleton reinforcing rib plates 4 are connected to the inner sides of the two shielding coil skeletons 2 to further enhance the stiffness between the two shielding coil skeletons 2.

[0033] As a preferred implementation in this embodiment, it should be further noted that the middle part of the main coil skeleton reinforcing rib plate 3 is connected to the main coil skeleton 1 through a plurality of first bolts 6 to ensure the stiffness of the main coil skeleton 1.

[0034] As a preferred implementation in this embodiment, it should be further noted that the middle part of each main coil skeleton reinforcing rib plate 3 is connected to the main coil skeleton 1 through six first bolts 6. The number is not too many, but it can ensure the stiffness of the main coil skeleton 1.

[0035] As a preferred implementation in this embodiment, it should be further noted that both ends of the main coil skeleton reinforcing rib plate 3 are each connected to the main coil skeleton 1 through a plurality of second bolts 7 to ensure the stiffness of the main coil skeleton 1.

[0036] As a preferred implementation in this embodiment, it should be further noted that both ends of the main coil skeleton reinforcing rib plate 3 are connected to the main coil skeleton 1 through three second bolts 7 each. The number is not too large, but it can ensure the stiffness of the main coil skeleton 1.

[0037] The assembly connection steps of the present invention are as follows:

[0038] 1. The main coil skeleton 1 is used as the main assembly part, and other parts are assembled on this part.

[0039] 2. The main coil skeleton reinforcing rib plate 3 (preferably 4 pieces) is fixed on the main coil skeleton 1 through the first bolts 6 (preferably 24 pieces) and the second bolts 7 (preferably 24 pieces). The connection method is not limited to bolts, and other connection methods can be adopted.

[0040] 3. The shielding coil skeletons 2 (2 pieces) are assembled at both ends of the main coil skeleton 1.

[0041] 4. The reinforcing rib plate connecting plates 5 (preferably 16 pieces) are welded inside the shielding coil skeletons (completed before the skeleton processing).

[0042] 5. The shielding coil skeleton reinforcing rib plates 4 (preferably 8 pieces) are welded on the reinforcing rib plate connecting plates 5 and are evenly distributed in a circle.

[0043] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A magnet structure that is beneficial to improving the stiffness of the coil skeleton of a conduction-cooled superconducting magnet, characterized in that, It includes a main coil skeleton (1) and two shielding coil skeletons (2) respectively connected to both sides of the main coil skeleton (1). A main coil skeleton stiffening rib plate (3) is connected to the outside of the main coil skeleton (1), and a plurality of shielding coil skeleton stiffening rib plates (4) are connected to the inner sides of the two shielding coil skeletons (2). All the shielding coil skeleton stiffening rib plates (4) are evenly distributed along the circumferential direction of the main coil skeleton (1) on the outside of the main coil skeleton (1).

2. The magnet structure according to claim 1, which is beneficial to improving the stiffness of the coil skeleton of the conduction-cooled superconducting magnet, is characterized in that, Both ends of each shielding coil skeleton stiffening rib plate (4) are connected to the inner side of the corresponding shielding coil skeleton (2) through a stiffening rib plate connecting plate (5).

3. The magnet structure according to claim 1 or 2, which is beneficial to improving the stiffness of the coil skeleton of the conduction-cooled superconducting magnet, is characterized in that, Eight shielding coil skeleton stiffening rib plates (4) are connected to the inner sides of the two shielding coil skeletons (2).

4. The magnet structure according to claim 1, which is beneficial to improving the stiffness of the coil skeleton of the conduction-cooled superconducting magnet, is characterized in that, A plurality of main coil skeleton stiffening rib plates (3) evenly distributed along the circumferential direction of the main coil skeleton (1) are connected to the outside of the main coil skeleton (1).

5. The magnet structure according to claim 1 or 4, which is beneficial to improving the stiffness of the coil skeleton of the conduction-cooled superconducting magnet, is characterized in that The middle part of the main coil skeleton stiffening rib plate (3) is connected to the main coil skeleton (1) through a plurality of first bolts (6).

6. The magnet structure according to claim 5, which is beneficial to improving the stiffness of the coil skeleton of the conduction-cooled superconducting magnet, is characterized in that The middle part of each main coil skeleton stiffening rib plate (3) is connected to the main coil skeleton (1) through six first bolts (6).

7. The magnet structure according to claim 1 or 4, which is beneficial to improving the stiffness of the coil skeleton of the conduction-cooled superconducting magnet, is characterized in that Both ends of the main coil skeleton stiffening rib plate (3) are respectively connected to the main coil skeleton (1) through a plurality of second bolts (7).

8. The magnet structure according to claim 7, which is beneficial to improving the stiffness of the coil skeleton of the conduction-cooled superconducting magnet, is characterized in that Both ends of the main coil skeleton stiffening rib plate (3) are respectively connected to the main coil skeleton (1) through three second bolts (7).

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