CN215298979U - Superconducting coil device and magnetic resonance apparatus - Google Patents

Abstract

The utility model provides a superconducting coil device and magnetic resonance equipment, magnetic resonance equipment include low temperature vessel, wire winding support and superconducting coil, and the superconducting coil device includes superconducting coil, superconducting coil includes the pencil that the superconducting wire formed, be provided with the protective layer on at least one face of periphery of pencil, the protective layer along the pencil extends, superconducting coil with the protective layer passes through the resin and bonds fixedly. The utility model discloses an at the outside protective layer that forms of superconducting coil, the protective layer can prevent on superconducting coil and the heat transfer that the external structure friction generated to superconducting coil to reduce superconducting coil's quench risk.

Description

Superconducting coil device and magnetic resonance apparatus

Technical Field

The utility model relates to a superconducting magnet technical field, in particular to superconducting coil device and magnetic resonance equipment.

Background

At present, the superconducting technology is widely applied to the aspects of energy, medical treatment, traffic, national defense, large scientific engineering and the like. Based on the characteristics of superconducting materials, superconducting coils become one of the technical solutions to be realized.

The superconducting coils are typically wound on a winding support. Wherein the superconducting coil has a critical current Ic, a critical magnetic field strength Hc, and a critical temperature Tc. In use, each of the current, field strength and temperature of the superconducting coil must be maintained below critical values in order for the superconducting coil to have superconducting properties. If any one of the parameters exceeds a critical value, the superconducting coil loses its superconducting property. In practical application, the ambient temperature of the superconducting coil changes according to different working conditions, and sometimes exceeds the critical temperature Tc, which causes the superconducting coil to quench.

Specifically, after the superconducting coil is electrified, a large lorentz force is generated inside the superconducting coil, so that the superconducting coil slightly moves relative to the winding support, friction is generated between the superconducting coil and the winding support in the moving process, the superconducting coil absorbs heat generated by the friction, and once the temperature of the superconducting coil exceeds the critical temperature Tc, the superconducting coil loses the quench. In addition, resin is poured between the superconducting coil and the winding bracket to fix the superconducting coil and the winding bracket, but the resin often cracks after being stressed. If the resin is cracked, mechanical energy generated at the moment of cracking is transferred to the superconducting coil, and the temperature of the superconducting coil exceeds the critical temperature Tc, so that the superconducting coil is quenched. The prior art does not solve the problems well.

SUMMERY OF THE UTILITY MODEL

In order to solve one or more technical problems in the prior art, an object of the present invention is to provide a superconducting coil device and a magnetic resonance apparatus, wherein a protective layer is disposed on a periphery of a superconducting coil, and the protective layer can prevent heat generated by friction and resin cracking energy from being transferred to the superconducting coil, so that the temperature of the superconducting coil does not rise due to energy absorption, thereby significantly reducing the risk of quench of the superconducting coil.

In order to achieve the above object, the present invention provides a superconducting coil device, including a superconducting coil, the superconducting coil includes a wire harness formed by a plurality of superconducting wires, a protective layer is provided on at least one peripheral surface of the wire harness, the protective layer is along the wire harness extends, the superconducting coil with the protective layer is fixed by resin bonding.

Optionally, the superconducting coil device further includes a winding support, the superconducting coil is wound on the winding support, and the protective layer is at least disposed between the winding support and the superconducting coil.

Optionally, the winding support is a cylindrical structure, and the protective layer is disposed in an axial direction of the winding support and/or a radial direction of the winding support.

Optionally, the superconducting coil has three faces facing the winding support, and the protective layer is disposed on the periphery of the superconducting coil facing the three faces of the winding support.

Optionally, the superconducting coil further has a surface facing away from the winding support, and the surface of the periphery of the superconducting coil facing away from the winding support is further provided with the protective layer.

Alternatively, the protective layer is configured as an insulating layer capable of bonding with a resin.

Optionally, the insulating layer includes at least one of a non-woven fabric, a glass fiber cloth, and a carbon fiber cloth.

Optionally, the thickness of the protective layer is less than 10 mm.

Optionally, an isolation layer is disposed on a side of the protection layer facing away from the superconducting coil.

Optionally, the isolation layer is a non-stick adhesive layer.

In order to achieve the above object, the present invention also provides a magnetic resonance apparatus including a cryogenic vessel, a winding support and a superconducting coil. The low-temperature container surrounds to form an accommodating space. The winding bracket is arranged in the accommodating space and is provided with a plurality of winding grooves. The superconducting coil is arranged in the winding groove of the winding support and comprises a wiring harness formed by superconducting wires, and a protective layer is arranged on the surface, facing the winding groove, of the wiring harness.

Optionally, a non-stick adhesive layer is arranged on a wall of the winding groove.

Optionally, shim assemblies are provided around the outside of the cryogenic vessel and can be driven to move circumferentially or axially of the cryogenic vessel.

According to the superconducting coil device and the magnetic resonance equipment, the protective layer capable of being bonded with resin is additionally arranged on the periphery of the superconducting coil, the protective layer can be formed at the position where friction possibly exists between the superconducting coil and an external structure, the protective layer can reduce or even avoid heat generated by friction between the protective layer and the external structure from being transferred to the superconducting coil, and even if the structure formed by the protective layer and the superconducting coil moves relative to the external structure, friction energy generated by the movement can be thermally blocked through the protective layer, so that the friction heat is prevented from being transferred to the superconducting coil. Finally, the temperature of the superconducting coil can be prevented from exceeding the critical temperature, and the quench risk of the superconducting coil is reduced.

The superconducting coil device and the magnetic resonance equipment preferably further comprise protective layers which are arranged on the surfaces departing from the winding support and are preferably arranged on the three surfaces facing the winding support on the periphery of the superconducting coil, so that the protective layers form a protective shell of the superconducting coil outside the superconducting coil, the protective shell can comprehensively protect the superconducting coil, heat is prevented from being transferred to the superconducting coil outside the superconducting coil, and the heat blocking effect is better. In addition, when superconducting coil and wire winding support detachably are connected, because superconducting coil and protective layer bonding are as an organic whole for superconducting coil at this moment can break away from wire winding support exclusive use, thereby can place the superconducting coil who has the protective housing in other occasions as required, and the flexibility is good, and it is more convenient to use.

Drawings

FIG. 1 is a schematic axial cross-sectional view of a superconducting coil in accordance with a preferred embodiment of the present invention, wherein a protective layer is disposed on each of four sides of the periphery of the superconducting coil;

FIG. 2 is a schematic axial cross-sectional view of a preferred embodiment of the present invention, wherein the superconducting coil is not disposed on the winding frame, and a protective layer is disposed on three surfaces of the superconducting coil facing the winding frame;

fig. 3 is a schematic axial cross-sectional view of a superconducting coil device according to a preferred embodiment of the present invention, in which a protective layer is provided on both surfaces of the superconducting coil facing the winding frame;

fig. 4 is a schematic axial cross-sectional view of a superconducting coil device according to another preferred embodiment of the present invention, in which a protective layer is disposed on three surfaces of the superconducting coil facing the winding frame, and an isolation layer is disposed between the protective layer and the winding frame;

fig. 5 is a schematic axial cross-sectional view of a superconducting coil device according to another preferred embodiment of the present invention, in which a protective layer is provided on three surfaces of the superconducting coil facing the winding frame, and a protective layer is provided on one surface of the superconducting coil facing away from the winding frame;

fig. 6 is a schematic axial cross-sectional view of a superconducting coil device according to still another preferred embodiment of the present invention, in which an isolation layer is disposed between a protective layer and a winding frame, and the three surfaces of the superconducting coil facing the winding frame are provided with the protective layers, while one surface of the superconducting coil facing away from the winding frame is provided with the protective layer;

fig. 7 is a perspective view of a superconducting coil in a preferred embodiment of the present invention;

FIG. 8a is a front view of the superconducting coil of FIG. 7;

FIG. 8b is a cross-sectional view of the superconducting coil of FIG. 8a taken along line A-A, with a partially enlarged structure at the upper left;

fig. 9 is a schematic structural diagram of a magnetic resonance apparatus according to a preferred embodiment of the present invention;

fig. 10 is a schematic structural diagram of a magnetic resonance system in a preferred embodiment of the present invention.

Wherein the reference numerals are as follows:

1-a superconducting coil; 11-a top surface;

12-a bottom surface; 13-left flank;

14-right side; 2-a protective layer;

3-winding the wire bracket; 31-a winding slot;

311-bottom wall; 312-left sidewall;

313-right side wall; 4-an isolation layer;

5-a low-temperature container; 6-an accommodation space;

7-a shim assembly; 8-imaging area.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention.

Fig. 1 is a schematic axial sectional view of a superconducting coil according to a preferred embodiment of the present invention, fig. 2 is a schematic axial sectional view of a winding frame according to a preferred embodiment of the present invention when no superconducting coil is disposed thereon, fig. 3 is a schematic axial sectional view of a superconducting coil device according to a preferred embodiment of the present invention, fig. 4 is a schematic axial sectional view of a superconducting coil device according to another preferred embodiment of the present invention, fig. 5 is a schematic sectional view of a superconducting coil device according to another preferred embodiment of the present invention, fig. 6 is a schematic sectional view of a superconducting coil device according to yet another preferred embodiment of the present invention, fig. 7 is a perspective view of a superconducting coil according to a preferred embodiment of the present invention, fig. 8a is a front view of a superconducting coil according to fig. 7, fig. 8b is a sectional view of a superconducting coil according to fig. 8a taken along a-a line, fig. 9 is a schematic structural view of a magnetic resonance apparatus according to a preferred embodiment of the present invention, fig. 10 is a schematic structural diagram of a magnetic resonance system in a preferred embodiment of the present invention. It should be understood that fig. 1 to 6 show only half of the axial cross section of the superconducting coil or the superconducting coil device when the winding frame is of a cylindrical structure, and the other half and the shown half are actually disposed symmetrically with respect to the axis of the winding frame. The upper left drawing in fig. 8B is an enlarged view of the position B in fig. 8B.

The technical solution proposed by the present invention will be further explained with reference to the accompanying drawings and several preferred embodiments.

Referring to fig. 1 to 3, the present invention provides a superconducting coil device including a superconducting coil 1, which is a wire harness formed of a plurality of superconducting wires, and four faces are formed on the superconducting coil 1, that is, the wire harness is formed of four faces, which are a top face 11, a bottom face 12, a left side face 13, and a right side face 14 of the superconducting coil 1, respectively. Referring to fig. 7 and 8, superconducting coil 1 is a ring-shaped structure, and superconducting coil 1 is disposed symmetrically about its axis in an axial sectional view of superconducting coil 1. It will be understood that the top surface 11 is an outer annular surface, the bottom surface 12 is an inner annular surface, and the left side surface 13 and the right side surface 14 are two end surfaces of the ring, respectively. In which a protective layer 2 (shadow-filled portion) is provided on at least one face of the periphery of the superconducting coil 1, that is, the superconducting coil 1 may be provided with the protective layer 2 on one or more of the top face 11, the bottom face 12, the left side face 13, and the right side face 14, the protective layer 2 extending along the wire harness, for example, the protective layer 2 extending in the length direction, the width direction, or the thickness direction of the wire harness, and the superconducting coil 1 and the protective layer 2 are fixed by resin bonding. In this embodiment, the longitudinal direction of the wire harness is the circumferential direction of the annular structure formed by the superconducting coil 1 shown in fig. 7, the width direction of the wire harness is, for example, the direction parallel to Fz shown in fig. 3, and the thickness direction of the wire harness is, for example, the direction parallel to Fr in fig. 3.

The utility model discloses can form protective layer 2 on 1 outside at least one face of superconducting coil, protective layer 2 can reduce and even avoid superconducting coil 1 and external structure (not shown) between the heat transfer that the friction generated to superconducting coil 1, that is, protective layer 2 bonds as an organic wholely with superconducting coil 1, protective layer 2 sets up along superconducting wire 1's length direction, even there is the activity for external structure in the structure that protective layer 2 and superconducting coil 1 formed this moment, the friction energy that this activity produced also can carry out the heat through protective layer 2 and block, thereby avoid the heat transfer of friction to superconducting coil 1 on. Thereby, the temperature of the superconducting coil 1 can be prevented from exceeding the critical temperature, and the quench risk of the superconducting coil 1 is reduced.

Referring to fig. 2, the superconducting coil apparatus preferably further includes a winding frame 3, the superconducting coil 1 is wound on the winding frame 3, and a protective layer 2 is preferably provided at least between the winding frame 3 and the superconducting coil 1. In this embodiment, the outer structure comprises a wire wound support 3. Constructed as such, the utility model discloses can form protective layer 2 on superconducting coil 1 and wire winding support 3 probably produce frictional position to carry out the heat to the friction heat that protective layer 2 and wire winding support 3 produced and block. In addition, if the potting resin also permeates to the winding support 3, the winding support 3 and the protective layer 2 are bonded and fixed, at the moment, even if the resin cracks, the existence of the protective layer 2 can block the energy of the resin crack from being transmitted to the superconducting coil 1, so that the energy of the resin stress crack between the protective layer 2 and the winding support 3 from being transmitted to the superconducting coil 1 is reduced. Eventually, the risk of quench of the superconducting coil 1 can also be reduced.

The shape of the winding support 3 is not limited in the present application, and optionally, the winding support 3 has a cylindrical structure. Further, the protective layer 2 is disposed in an axial direction of the bobbin 3 and/or in a radial direction of the bobbin 3, the axial direction being a direction in which the superconducting coil 1 receives an axial lorentz force Fz in the electric field. In the preferred embodiment, the superconducting coil 1 is provided with the protective layer 2 in both the axial and radial directions of the winding frame 3. The axial direction here (the axial direction of the circular structure formed by the superconducting coil 1 being wound around) is actually the direction in which the superconducting coil 1 is subjected to the axial lorentz force Fz in the electric field.

In this embodiment, the material of the protective layer 2 is preferably a resin reinforced material, which can be well combined with the potting resin, and the resin reinforced material is mainly a fiber, such as a non-woven fabric, a glass fiber, or a carbon fiber.

In the present embodiment, the winding frame 3 is a cylindrical structure made of a non-magnetic metal material, an annular winding groove 31 (see fig. 2 and 9) is formed on an outer peripheral surface of the cylindrical structure, and the superconducting coil 1 is wound in the winding groove 31 of the winding frame 3. As shown in fig. 2, the winding slot 31 has a bottom wall 311, a left side wall 312, and a right side wall 313. The left and right side walls are located in the axial direction of the winding frame 3, and the bottom wall 311 is adjacent to the left and right side walls.

In some embodiments, as shown in fig. 1, 5 and 6, the protective layer 2 is disposed on four sides of the superconducting coil 1, that is, the protective layer is disposed on three sides of the superconducting coil 1 facing the winding frame 3 and one side of the superconducting coil 1 facing away from the winding frame 3, and it is also understood that the protective layer 2 is disposed on the top surface 11, the bottom surface 12, the left side surface 13 and the right side surface 14 of the superconducting coil 1.

In some embodiments, as shown in fig. 2 and 4, the superconducting coil 1 is provided with a protective layer 2 on each of three sides facing the winding frame 3.

In other embodiments, as shown in fig. 3, the superconducting coil 1 is provided with a protective layer 2 on both sides facing the winding frame 3.

It should be understood that the present application does not specifically limit the position of the protective layer 2 on the superconducting coil 1, i.e., the position of the protective layer 2 is determined according to the force applied to the superconducting coil 1.

In the preferred embodiment, the protective layer 2 is provided on both the bottom wall 311 and the left and right side walls of the superconducting coil 1 facing the winding slot 31.

In more detail, referring to fig. 3, the protective layer 2 is preferably disposed in the axial direction of the wire holder 3 and in the radial direction of the wire holder 3, when the axial direction is the direction in which the superconducting coil 1 is subjected to the axial lorentz force Fz in the electric field. It is to be understood that the arrangement direction of the protective layer 2 should be determined according to the direction of the lorentz force to which the superconducting coil 1 is subjected when energized, i.e., the protective layer 2 should be arranged in the direction in which the superconducting coil 1 and the wire wound holder 3 rub.

In the embodiment of the present invention, one side of superconducting coil 1 away from winding frame 3 is defined as the outer side (i.e., the outer peripheral surface) of superconducting coil 1. After the superconducting coil 1 is energized, the superconducting coil is mainly acted by a radial lorentz force Fr and an axial lorentz force Fz, wherein the radial lorentz force Fr points to the outer side of the superconducting coil 1, and the axial lorentz force Fz points to one end face of the winding frame 3. At this time, the superconducting coil 1 tends to expand outward in the radial direction and to compress in the force-receiving direction Fz in the axial direction, so that the superconducting coil 1 is easy to move. In this embodiment, Fz points to the left side of the wire wound bobbin 3 in fig. 3, but of course, in other embodiments, if the current direction changes, Fz may also point to the right side of the wire wound bobbin 3. Further, it is understood that superconducting coil 1 is also subjected to gravity, i.e., superconducting coil 1 may rub against bottom wall 311 of winding slot 31.

It should be understood that in order to ensure that the winding frame 3 and the superconducting coil 1 are provided with the protective layer at the positions where friction occurs, in one embodiment, the protective layer 2 is disposed at the bottom surface 12 and the left side surface 13 of the superconducting coil 1. At this time, since the right side surface 14 of the superconducting coil 1 is not pressed and rubbed by the superconducting coil 1, the protective layer 2 may not be disposed, as shown in fig. 3. In this case, only by arranging the protective layer 2 on the bottom surface 12 and the left side surface 13 of the superconducting coil 1, the manufacturing cost of the superconducting coil can be reduced as much as possible on the premise that the superconducting coil 1 reduces the risk of quench, and the superconducting coil 1 has a simple structure and is suitable for being used in occasions where both the external environment and the use requirements are relatively fixed. Of course, at this time, the protective layer 2 may also be arranged at the bottom surface 12 and the right side surface 14 of the superconducting coil 1, depending on the change in the direction of the current received by the superconducting coil 1.

Further, the protective layer 2 is provided as an insulating layer capable of bonding with resin. The utility model discloses in, protective layer 2 can combine to indicate superconducting coil 1 after the encapsulating with the resin mutually, and the encapsulating resin can bond with protective layer 2 mutually, and superconducting coil 1 also can bond as a whole through resin and protective layer 2 simultaneously. Set up protective layer 2 into the insulating layer, then 1 encapsulating backs of superconducting coil, the insulating layer can be attached and form the protective layer on superconducting coil 1's surface, and the insulating layer can take place the change of shape according to the 1 resin encapsulating condition of superconducting coil in addition, guarantees to form the protective layer that thickness is unanimous in each region of superconducting coil 1's outside, and the protection effect is better.

Optionally, the insulating layer includes at least one of a non-woven fabric, a glass fiber cloth, and a carbon fiber cloth. Wherein, the non-woven fabrics, the glass fiber cloth or the carbon fiber cloth are all materials which can be combined with resin and can permeate the resin. Use the non-woven fabrics, when glass fiber cloth or carbon fiber cloth are as protective layer 2, 1 encapsulating in-process of superconducting coil, the encapsulating resin can also see through protective layer 2 and reach on winding support 3's the inner wall, thereby after the encapsulating, make superconducting coil 1 and winding support 3 also can bond into a whole, superconducting coil 1 can be fixed for winding support 3 promptly, superconducting coil 1 does not take place relative movement and produce the friction with winding support 3 easily this moment, of course in other embodiments, the whole that superconducting coil 1 and protective layer 2 formed also can move for winding support 3, even there is the friction heat this moment, also can carry out the separation through protective layer 2.

It is to be understood that the protective layer 2 may be either a material that can be bonded to the resin or a material that cannot be bonded to the resin. If the protective layer 2 is made of a material that cannot be combined with resin, the superconducting coil 1 and the winding frame 3 after glue pouring cannot be fixed in a bonding manner, that is, the superconducting coil 1 can move relative to the winding frame 3. At this time, there is substantially no resin filling between the protection layer 2 and the winding frame 3, that is, there is no mechanical energy between the protection layer 2 and the winding frame 3 that may cause cracking of resin that may cause quench of the superconducting coil 1, and heat generated by friction between the protection layer 2 and the winding frame 3 may also be thermally blocked by the protection layer 2, thereby further reducing quench risk of the superconducting coil 1.

Furthermore, it should be explained that the protective layer 2 is not too thick, and the protective layer with too large thickness may crack itself when the superconducting coil 1 expands with heat and contracts with cold, thereby transferring energy to the superconducting coil 1 and causing the superconducting coil 1 to quench. Preferably, the thickness of the protective layer 2 is less than 10 mm.

Further, as shown in fig. 2 to 4 and fig. 6, an isolation layer 4 is preferably disposed between the protective layer 2 and the winding frame 3. The isolation layer 4 can provide better insulation between the superconducting coil 1 and the winding support 3. Further, the isolation layer 4 may be formed of a material having a low friction coefficient, such as teflon, so that the isolation layer 4 having a low friction coefficient may reduce heat generated by friction between the superconducting coil 1 and the winding frame 3 when relative friction occurs between the superconducting coil 1 and the winding frame 3.

Preferably, the release layer 4 is a non-stick adhesive layer, including but not limited to polytetrafluoroethylene. The non-stick layer is preferably arranged between the protective layer 2 and the winding frame 3, i.e. the non-stick layer is arranged on the wall of the winding groove 31 of the winding frame 3. The non-adhesive layer enables the superconducting coil 1 to be free of adhesion between the side, provided with the protective layer 2, of the superconducting coil 1 and the winding support 3 after glue filling, namely the side and the winding support 3 can move relatively, and the protective layer 2 and the winding support 3 are free of resin adhesion at the moment, so that the phenomenon that resin cracking between the superconducting coil 1 and the winding support 3 causes quench of the superconducting coil can be avoided.

Referring to fig. 4, when the protective layers 2 are disposed on the bottom wall 311 and the left and right side walls of the winding slot 31, the protection effect is better, and the superconducting coil 1 can be used in situations where the power-on condition of the superconducting coil may change, and is more flexible and convenient. Specifically, when the superconducting coil 1 is used, when the superconducting coil 1 is changed by the Fz direction, the protective layers on two sides of the superconducting coil 1 along the axial direction of the winding support 3 can better protect the superconducting coil 1, so that heat generated by friction between the superconducting coil 1 and the winding support 3 cannot be directly transferred to the superconducting coil 1, and superconducting coil quench caused by friction heat can be avoided.

Preferably, in order to prevent superconducting coil 1 from moving to the outside by Fr, a stopper structure for stopping superconducting coil 1 from moving may be provided outside superconducting coil 1. The structure of the limiting structure is not limited in the present application, and for example, the limiting structure may be a limiting block arranged on the winding support 3, or a sleeve coated on the superconducting coil 1 or a structure wound on the superconducting coil 1.

Referring to fig. 5, when the four surfaces of the superconducting coil 1 facing the winding frame 3 are all provided with the protective layers 2, in the process of glue resin filling of the superconducting coil 1, resin is fully filled between the superconducting wires of the superconducting coil 1 and between the superconducting coil 1 and the protective layers 2, after the glue resin filling is cured, the superconducting coil 1 and the protective layers 2 are integrated, and the protective layers 2 form the protective shell outside the superconducting coil 1. The protective layer can reduce or even prevent heat generated by friction between the protective layer 2 and the winding frame 3 from being thermally blocked by the protective layer 2, thereby preventing the frictional heat from being transferred to the superconducting coil 1. In addition, if the resin of the potting penetrates the winding support 3, the winding support 3 and the protection layer 2 are bonded and fixed, at this time, even if the resin cracks, the protection shell outside the superconducting coil 1 can block the energy of the resin crack from being transmitted to the superconducting coil 1, so that the energy of the resin stress crack between the protection layer 2 and the winding support 3 is reduced from being transmitted to the superconducting coil 1. Finally, the temperature of the superconducting coil 1 can be prevented from exceeding the critical temperature, and the quench risk of the superconducting coil 1 is reduced. According to the technical scheme, the complete resin protective shell is formed outside the superconducting coil 1, and the superconducting coil can be used in any occasions according to needs.

Further preferably, as shown in fig. 6, when the protective layer 2 is disposed on each of the four faces of the superconducting coil 1, the isolation layer 4 is disposed between the protective layer 2 and the winding support 3, and the isolation layer 4 is preferably a non-stick adhesive layer. Because the non-adhesive layer can not enable the potting resin to penetrate through, the winding support 3 and the superconducting coil 1 after potting are not bonded, the protective layer 2 and the superconducting coil 1 are bonded into a whole through the filling of the resin, and the superconducting coil 1 with the protective shell is formed independently outside the superconducting coil 1.

Alternatively, the winding frame 3 is detachably connected to the superconducting coil 1. The winding support 3 can be detached after the winding of the superconducting coil 1 is completed, and the independent protective shell is formed around the superconducting coil 1 at the moment, so that the protective shell can effectively isolate the energy generated by friction and heat outside the protective shell and the resin cracking energy from being transferred to the superconducting coil 1 when the superconducting coil 1 is used independently in other occasions, and the superconducting coil can be independently used in any occasions to avoid the quenching of the superconducting coil.

The utility model also provides a magnetic resonance device, as shown in fig. 7 and fig. 9, the magnetic resonance device comprises a low temperature container 5, a winding bracket 3 and a superconducting coil 1, wherein the low temperature container 5 surrounds to form an accommodating space 6; the winding bracket 3 is arranged in the accommodating space 6, and the winding bracket 3 is formed with a plurality of independent winding grooves 31; the superconducting coil 1 is disposed in the winding slot 31 of the winding frame 3. The superconducting coil 1 includes a bundle of a plurality of superconducting wires (not shown), and a protective layer 2 is preferably provided on a surface of the bundle facing the winding groove 31.

It should be understood that the superconducting coil device for the magnetic resonance apparatus is generally configured to fill a tank of the cryogenic container 5 with helium to immerse the superconducting coil 1, so that the superconducting coil 1 maintains a cryogenic superconducting state, and a stable strong magnetic field is generated after the coil is excited. In the present embodiment, the protective layer 2 is provided on the groove walls of the plurality of winding grooves 31, and the protective layer 2 may be formed on the corresponding surface outside the superconducting coil 1 formed of the plurality of superconducting wires.

As shown in fig. 10, the present embodiment also provides a magnetic resonance system comprising a magnetic resonance apparatus, preferably further comprising a shim assembly 7 and a radiation therapy head, which may be arranged within the imaging region 8 (inside the cryogenic vessel 5) and which may be arranged outside the cryogenic vessel 5. Preferably, the outside of the cryogenic vessel 5 is surrounded by shim assemblies 7, and the shim assemblies 7 can be driven to move in the circumferential or axial direction of the cryogenic vessel 5. The magnetic resonance apparatus can be equipped with a radiation therapy head for treating head tumors on the outside or on the inside, the radiation therapy head is usually rotated around the circumferential direction, and the shimming of the magnetic resonance system can be influenced by the rotation of the radiation therapy head.

In particular, the magnetic field uniformity of the magnetic resonance system in the imaging region 8 is typically within 10PPM, which requires a very high degree of magnetic field uniformity. Both superconducting and permanent magnets require a uniform magnetic field to be achieved by further arranging ferromagnetic shims or adding shim coils, which are fixed to the magnetic resonance apparatus. Any ferromagnetic object moving close to or in the magnetic field will cause the magnetic field uniformity of the imaging region 8 to be poor and the imaging will not be normal.

During mri guided radiation treatment, the radiation treatment head and gantry (both not shown) need to rotate around the axis, and the radiation treatment head and gantry have many metal parts and parts of ferromagnetic parts, and the rotation of these metals in the mri magnetic field causes the uniformity of the magnetic field in the mri region 8 to change, resulting in the non-uniform and unstable magnetic field in the mri region 8.

To address this problem, a movable shim assembly 7 is provided outside the cryogenic vessel 5. The shimming mode of the application is divided into two stages:

the first stage is shimming of the static magnetic field of the magnet, during shimming, a rotating radiotherapy head is not arranged, only the static magnetic field of the magnetic resonance system is shimmed, and a magnetic resonance imaging region 8 with a uniform static magnetic field is obtained after shimming. The shimming mode is that one or both of ferromagnetic shimming pieces are arranged or the shimming coils are electrified.

In the second stage, the moving components interfere the shimming of the magnetic field, and the rotating radiotherapy head is installed on the magnetic resonance system which obtains the uniform static magnetic field in the first stage, as shown in fig. 10, the possible arrangement regions of the shimming pieces and the shimming coils in the second stage are the external circumferential direction of the magnetic resonance system, the internal circumferential direction of the inner hole of the magnetic resonance system and the circumferential direction of the axial end face of the magnetic resonance system. The second stage shim is arranged in at least one of the above regions and the arranged shims or coils rotate synchronously with the rotating component. In this case, the magnetic field in the imaging region 8 is not uniform due to the ferromagnetic object in the newly installed rotating radiation therapy head. The inhomogeneous magnetic field is composed of the homogeneous magnetic field which is well shimmed in the first stage and the inhomogeneous magnetic field which is influenced by the radiotherapy head. At this time, the inhomogeneous magnetic field is shimmed again to obtain a final homogeneous magnetic field. The shimming mode is that one or both of a ferromagnetic shimming piece which moves synchronously with the radiotherapy head is arranged or a shimming coil which moves synchronously with the radiotherapy head is electrified. Since the ferromagnetic shimming pieces or shimming coils used for the shimming in the second stage are shimming of the inhomogeneous magnetic field generated after the radiotherapy head is placed, the shimming in the second stage is understood to offset the influence of the radiotherapy head on the magnetic field of the imaging region 8.

The key of the scheme is that the shimming pieces and the shimming coils used for shimming in the second stage are synchronously rotated with the radiation therapy head. The magnetic field of the superconducting magnet is rotationally symmetric along the axial direction, and the radiation therapy head also rotationally moves along the axial direction, so that the influence of the radiation therapy head rotating after shimming in the second stage on the magnetic field of the imaging region 8 can be ignored, and the magnetic resonance guided radiation therapy system can normally work.

To sum up, the utility model provides a superconducting coil device can form protective layer 2 on superconducting coil 1 and the frictional position of winding support 3 or with other exterior structure through the protective layer 2 that can bond with superconducting coil 1 resin in superconducting coil 1's outside setting. The protective layer outside the superconducting coil 1 can reduce or even prevent heat generated by friction between the protective layer 2 and an external structure from being transferred to the superconducting coil 1, and at this time, even if the structure formed by the protective layer 2 and the superconducting coil 1 moves relative to the winding frame 3 or other external structures, the friction energy generated by the movement can be thermally blocked by the protective layer 2, so that the friction heat is prevented from being transferred to the superconducting coil 1. In addition, if the resin of the potting penetrates the winding support 3, the winding support 3 and the protection layer 2 are bonded and fixed, at this time, even if the resin cracks, the protection shell outside the superconducting coil 1 can block the energy of the resin crack from being transmitted to the superconducting coil 1, so that the energy of the resin stress crack between the protection layer 2 and the winding support 3 is reduced from being transmitted to the superconducting coil 1. Finally, the temperature of the superconducting coil 1 can be prevented from exceeding the critical temperature, and the quench risk of the superconducting coil 1 is reduced. Further, if the protective layers 2 are disposed on the four surfaces of the superconducting coil 1 facing and departing from the winding frame 3, the protective layer 2 outside the superconducting coil 1 forms a protective shell of the superconducting coil 1, and at this time, the superconducting coil 1 can be used alone without being separated from the winding frame 3, and the superconducting coil 1 can be placed in other occasions as required.

The above description is only for the preferred embodiment of the present invention, and not for any limitation of the scope of the present invention, and any modification and modification made by those skilled in the art according to the above disclosure all belong to the protection scope of the present invention.

Claims (10)

1. A superconducting coil device includes a superconducting coil, and is characterized in that the superconducting coil includes a wire harness formed of a plurality of superconducting wires, a protective layer is provided on at least one surface of the periphery of the wire harness, the protective layer extends along the wire harness, and the superconducting coil and the protective layer are fixed by resin bonding.

2. The superconducting coil assembly of claim 1 further comprising a winding support on which the superconducting coil is wound, the protective layer being disposed at least between the winding support and the superconducting coil.

3. The superconducting coil device according to claim 2 wherein the winding support is a cylindrical structure, and the protective layer is provided in an axial direction of the winding support and/or in a radial direction of the winding support.

4. The superconducting coil device according to claim 2 or 3, wherein the superconducting coil has three faces facing the winding support, and the three faces of the periphery of the superconducting coil facing the winding support are each provided with the protective layer.

5. The superconducting coil device of claim 4 wherein the superconducting coil further has a face facing away from the winding support, the face of the periphery of the superconducting coil facing away from the winding support further being provided with the protective layer.

6. The superconducting coil device according to any one of claims 1 to 3, wherein the protective layer is configured as an insulating layer capable of bonding with a resin, the insulating layer including at least one of a non-woven fabric, a glass fiber cloth, and a carbon fiber cloth.

7. A superconducting coil device according to any one of claims 1-3 wherein the thickness of the protective layer is less than 10 mm.

8. A superconducting coil arrangement according to any one of claims 1-3 wherein a side of the protective layer facing away from the superconducting coil is provided with a barrier layer, the barrier layer being a non-stick glue layer.

9. A magnetic resonance apparatus, characterized by comprising:

a low temperature container surrounding to form an accommodation space;

a winding bracket disposed in the accommodating space, the winding bracket being formed with a plurality of winding grooves; and the number of the first and second groups,

the superconducting coil is arranged in the winding groove of the winding support and comprises a wiring harness formed by superconducting wires, and a protective layer is arranged on the surface, facing the winding groove, of the wiring harness.

10. The mr apparatus of claim 9 wherein shim assemblies are circumferentially disposed outside the cryogenic vessel and are drivable to move circumferentially or axially of the cryogenic vessel.

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