CN213988465U - Low-temperature retainer and nuclear magnetic resonance imaging equipment - Google Patents

Abstract

The utility model relates to the technical field of medical equipment, a cryostat and nuclear magnetic resonance imaging equipment is disclosed. The low-temperature retainer comprises an inner container, an outer container and a hanging piece, wherein the inner container is used for accommodating the superconducting magnet, an accommodating device is inwards and concavely arranged on the outer wall of the inner container, the outer container is covered outside the inner container, one end of the hanging piece is connected with the outer container, and the other end of the hanging piece extends into the accommodating device and is connected with the cylinder bottom of the accommodating device. The utility model discloses cryostat makes at least part of flying piece hold in the container, then under the prerequisite of guaranteeing that the flying piece is enough long, can reduce the space between inner container and the outer container to compact structure between the spare part that makes cryostat, whole volume is littleer. The nuclear magnetic resonance imaging equipment of the utility model has compact integral structure and small occupied space by arranging the cryostats device; meanwhile, the heat transfer from the suspension member to the inner container is small, and the low-temperature environment of the inner container can be well maintained.

Description

Low-temperature retainer and nuclear magnetic resonance imaging equipment

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to a cryostat and nuclear magnetic resonance imaging equipment.

Background

Superconducting magnets are coil structures made of superconductors of the second type having a high critical magnetic field at low temperatures. With the continuous progress of science and technology, superconducting magnets are also applied more and more widely in daily life of people, wherein nuclear magnetic resonance imaging equipment is one of the main application scenes of the superconducting magnets.

Superconducting magnets need to work properly at low temperatures, and therefore they need to be housed in a cryogenic chamber, and the cryogenic chamber is usually suspended in order to minimize heat transfer from the cryogenic chamber to external structures. As shown in fig. 1 and 2, a suspension structure of a superconducting magnet in the related art includes: the superconducting magnet comprises an inner container 1 ', an outer container 2' and a plurality of suspension pieces 3 ', wherein the cross section of the inner container 1' is annular, the superconducting magnet is arranged in the inner container 1 ', and a refrigerating medium such as liquid helium is filled in the inner container 1', so that the superconducting magnet can keep low temperature; the outer container 2 'is also annular and covers the periphery of the inner container 1', and two ends of the suspension piece 3 'are respectively connected with the wall surfaces of the outer container 2' and the inner container 1 ', so that the inner container 1' is stably supported; in order to reduce the heat transfer of the inner container 1 ' with the external environment through the suspension 3 ', maintaining the low temperature environment of the inner container, the suspension 3 ' is typically provided as a rod (or ring, etc.) having a longer length and a smaller cross-sectional area; however, the longer length of the suspension member 3 ' requires a large enough space between the outer wall of the inner container 1 ' and the inner wall of the outer container 2 ', so that the entire cryostat is bulky and the mri apparatus occupies a large space.

Therefore, a need exists for a cryostat and an mri apparatus to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

A first object of the present invention is to provide a cryostat, which is compact and small in overall structure.

A second object of the present invention is to provide a nuclear magnetic resonance imaging apparatus, which has a compact overall structure and occupies a small space by providing the above cryostat device; meanwhile, the heat transfer from the suspension member to the inner container is small, and the low-temperature environment of the inner container can be well maintained.

To achieve the purpose, the utility model adopts the following technical proposal:

a cryostat, comprising:

the inner container is used for accommodating the superconducting magnet, and an accommodating device is inwards concave on the outer wall of the inner container;

an outer container arranged outside the inner container; and

one end of the hanging piece is connected with the outer container, and the other end of the hanging piece extends into the container and is connected with the cylinder bottom of the container.

Optionally, the cryostat includes a plurality of the hangers.

Optionally, the cryostat comprises at least eight of said suspension elements, wherein part of said suspension elements are arranged symmetrically in a horizontal or vertical plane.

Optionally, the inner container and the outer container are both bodies of revolution, the inner container comprises a first outer cylinder and two first end plates, and the outer container comprises a second outer cylinder and two second end plates.

One end of the container is arranged on the first end plate, the other end of the container extends into the inner container, one end of the hanging piece is connected with the second end plate, and the other end of the hanging piece is connected with the container; or

One end of the container is arranged on the first outer cylinder, the other end of the container extends into the inner container, one end of the hanging piece is connected with the second outer cylinder, and the other end of the hanging piece is connected with the container.

Optionally, the inner container and the outer container are both annular bodies of revolution, the inner container being received in an inner cavity of the outer container.

Optionally, after the container extends from one container wall of the inner container into the inner container, the bottom of the container is connected with the other container wall of the inner container.

Optionally, the superconducting magnet includes an inner coil and an outer coil, the inner coil is sleeved with the outer coil, and the bottom of the container extends into a space between the inner coil and the outer coil.

Optionally, a vacuum environment is provided between the outer container and the inner container.

Optionally, a thermal radiation shield is provided between the inner and outer containers.

A magnetic resonance imaging apparatus comprising a superconducting magnet and the cryostat, the superconducting magnet being disposed within the inner vessel.

The utility model discloses beneficial effect does:

the utility model discloses a cryostat sets up the container on the outer wall of inner container to the indent to make at least part of flying piece hold in the container, then under the prerequisite of guaranteeing that the flying piece is enough long, can reduce the space between inner container and the outer container, thereby compact structure between the spare part that makes cryostat, whole volume is littleer.

The nuclear magnetic resonance imaging equipment of the utility model has the advantages that the whole structure of the equipment is compact and the occupied space is small by arranging the low-temperature retainer; meanwhile, the heat transfer from the suspension member to the inner container is small, and the low-temperature environment of the inner container can be well maintained.

Drawings

FIG. 1 is a front view schematic of a cryostat provided in the prior art;

FIG. 2 is a schematic side view of a prior art cryostat;

fig. 3 is a schematic front view of a cryostat according to an embodiment of the present invention;

fig. 4 is a schematic side view of a cryostat according to an embodiment of the present invention;

fig. 5 is a schematic front view of a cryostat according to a second embodiment of the present invention;

fig. 6 is a schematic side view of a cryostat according to a second embodiment of the present invention.

In the figure:

1' -the inner container; 2' -an outer container; 3-' a suspension part;

1-an inner container; 11-a first outer barrel; 12-a first end plate; 13-a first inner barrel;

2-an outer container; 21-a second outer barrel; 22-a second end plate; 23-a second inner cylinder;

3-a suspension member;

4-a container;

5-a superconducting magnet; 51-inner coil; 52-outer coil;

6-thermal radiation shield.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

Example one

The present embodiment provides a cryostat for receiving and supporting a superconducting magnet 5. As shown in fig. 3 and 4, the cryostat includes an inner container 1, an outer container 2, and a suspension member 3, wherein the superconducting magnet 5 is accommodated in the inner container 1, a container 4 is provided on an outer wall of the inner container 1 to be recessed inward, the outer container 2 is covered outside the inner container 1, one end of the suspension member 3 is connected to the outer container 2, and the other end thereof extends into the container 4 and is connected to a bottom of the container 4. The cryostat of the present embodiment has at least a portion of the suspension member 3 accommodated in the receptacle 4, and the space between the inner container 1 and the outer container 2 can be reduced while ensuring the suspension member 3 to be long enough, so that the components of the cryostat are compact and the overall volume is smaller.

Optionally, the suspension member 3 is rod-shaped, band-shaped, tube-shaped or ring-shaped. The container 4 is a slender cylinder and is hermetically connected with the inner container 1, and one end of the suspension member 3 is connected with the cylinder bottom of the container 4 only after extending into the container 4, so that a longer heat transfer path is maintained, and heat conduction is reduced. Preferably, the cross section of the container 4 is circular, and the container 4 and the hanging piece 3 are coaxially arranged, so that the manufacturing and the installation are more convenient, and the hanging piece 3 is ensured not to be contacted with the part except the cylinder bottom of the container 4. Optionally, the bottom of the container 4 may be provided with threads, hooks or other connecting structures to facilitate the mounting and connection of the hanger 3 to the container 4.

Since the superconducting magnet 5 has an annular coil structure and the superconducting magnet 5 needs to have a target object inside the coil when it is operated, in the present embodiment, the inner container 1 and the outer container 2 are both hollow annular rotary bodies. As shown in fig. 3 and 4, the inner container 1 and the outer container 2 are coaxially arranged, and the central axis of the inner container 1 extends along a horizontal Z direction, which is perpendicular to each other, a horizontal X direction and a vertical Y direction, and the inner container 1 is completely accommodated in the outer container 2.

Specifically, as shown in fig. 4, the inner container 1 includes a first outer cylinder 11, two first end plates 12 and a first inner cylinder 13, the first outer cylinder 11 is coaxially sleeved outside the first inner cylinder 13, two ends of the first outer cylinder 11 are respectively connected to the two first end plates 12, and two ends of the first inner cylinder 13 are also respectively connected to the two first end plates 12, so as to form an annular revolving body structure. Similarly, the outer container 2 includes a second outer cylinder 21, two second end plates 22 and a second inner cylinder 23, the second outer cylinder 21 is coaxially sleeved outside the second inner cylinder 23, two ends of the second outer cylinder 21 are respectively connected to the two second end plates 22, and two ends of the second inner cylinder 23 are also respectively connected to the two second end plates 22, so as to form an annular revolving body structure, so as to facilitate installation of the internal superconducting magnet 5.

Preferably, as shown in fig. 3 and 4, a vacuum environment is formed between outer container 2 and inner container 1, so that inner container 1 is prevented from heat exchange with the surrounding environment by means of thermal convection and thermal conduction (except for heat transfer with hanger 3), and a low-temperature environment inside inner container 1 is maintained.

Furthermore, a heat radiation shielding layer 6 is arranged between the inner container 1 and the outer container 2, so that heat exchange between the inner container 1 and the surrounding environment through a heat radiation mode is reduced, and the heat preservation requirement of the inner container 1 is further improved.

When a plurality of hangers 3 strain inner container 1 to support inner container 1, not only need to bear the self gravity of inner container 1, in the transportation process of cryostat, hangers 3 may also need to bear the impact load which is several times greater than the self gravity of inner container 1, in the prior art, hangers 3 are usually arranged along the horizontal or vertical direction of inner container 1, at this moment, the load borne by hangers 3 is comparatively simple, sixteen hangers 3 are usually needed to support, so as to ensure the support stability of inner container 1 and the structural strength of cryostat, the overall structure is complex, the assembly process is tedious, and the cost is high.

Preferably, in order to further reduce the space between the inner container 1 and the outer container 2, as shown in fig. 3 and 4, the cryostat includes a plurality of hanging members 3, and the hanging members 3 are obliquely arranged (the oblique arrangement means that the hanging members 3 do not coincide with any one of the horizontal X direction, the vertical Y direction, the horizontal Z direction, i.e., the axial direction of the inner container 1), so that the space required for the inner container 1 and the outer container 2 in the radial direction or the axial direction is reduced when the length of the hanging members 3 is constant, thereby making the entire structure more compact.

Preferably, in the present embodiment, as shown in fig. 3 and 4, the cryostat includes eight suspension members 3, wherein four suspension members 3 are a set of suspension member groups, two sets of suspension member groups are symmetrically arranged on the vertical plane, and each set of suspension member groups includes four suspension members 3. Specifically, an angle between hanger 3 and the horizontal Z direction is α, α is 20 °, an angle between hanger 3 and the vertical Y direction is β, β is 52 °, and an angle between hanger 3 and the horizontal X direction is γ, γ is 20 °. This embodiment is through the reasonable overall arrangement to the position and the angle of hanger 3, under the condition of the less hanger 3 of quantity, can support inner container 1 better, guarantees that whole cryostat volume can bear the impact load in the transportation, guarantees inner container 1's stability.

Preferably, as shown in fig. 3 and 4, the receptacle 4 has one end disposed on the first end plate 12 and the other end extending into the inner container 1, and the hanger 3 has one end connected to the second end plate 22 and the other end connected to the receptacle 4. In the present embodiment, the connection point of the hanger 3 and the inner container 1 is arranged in the container 4 and is placed in the inner container 1, and the interlayer space between the inner container 1 and the outer container 2 is not additionally occupied, so that the size of the space between the inner container 1 and the outer container 2 in the radial direction can be further reduced, and the size of the whole cryostat in the radial direction can be further reduced.

Specifically, as shown in fig. 4, the superconducting magnet 5 includes an inner coil 51 and an outer coil 52, the outer coil 52 is sleeved on the inner coil 51, and both the inner coil 51 and the outer coil 52 are supported in the inner container 1 by a support structure (not shown in the figure); the corresponding container 4 may be disposed between the inner coil 51 and the outer coil 52, such that the container 4 has a larger position adjustment space, and the container 4 and the corresponding suspension members 3 accommodated therein may satisfy the above-mentioned position and angle arrangement, thereby preventing the position interference between the container 4 and the superconducting magnet 5.

Preferably, after the receptacle 4 extends from one container wall of the inner container 1 into the inner container 1, the receptacle 4 is connected to the other container wall of the inner container 1. In this embodiment, the container 4 extends into the inner container 1 from the first end plate 12 of the inner container 1 and then is connected to the first inner cylinder 13 of the inner container 1 (not shown in the figure), so that the container 4 and the two container walls of the inner container 1 form an approximately triangular structure, thereby improving the structural strength of the inner container 1, and simultaneously, the force on the suspension member 3 can act on the two container walls of the inner container 1, thereby further improving the structural strength and rigidity of the entire cryostat.

The present embodiment also provides a nuclear magnetic resonance imaging apparatus including the superconducting magnet 5 and the above-described cryostat, the superconducting magnet 5 being provided within the inner vessel 1. The nuclear magnetic resonance imaging equipment has the advantages that the whole structure is compact and the occupied space is small by arranging the low-temperature retainer device.

Example two

The basic structure and action principle of this embodiment are the same as those of the first embodiment, except that:

as shown in fig. 5 and 6, the receptacle 4 has one end disposed on the first outer cylinder 11 and the other end extending into the inner container 1, and the hanger 3 has one end connected to the second outer cylinder 21 and the other end connected to the receptacle 4. In the present embodiment, the connection point of the hanger 3 to the inner container 1 is arranged in the container 4 and placed in the inner container 1, and it is not necessary to additionally occupy the interlayer space between the inner container 1 and the outer container 2, so that the size of the space between the inner container 1 and the outer container 2 in the axial direction and the radial direction can be further reduced, and the overall size of the entire cryostat can be further reduced.

In this embodiment, the superconducting magnet 5 includes an inner coil 51 and at least two outer coils 52 that are coaxially and spaced apart from each other, the outer coils 52 are sleeved on the inner coil 51, and both the inner coil 51 and the outer coils 52 are supported in the inner container 1 by a supporting structure (not shown). The container 4 and the corresponding suspension 3 are coaxially arranged, and the bottom of the container 4 extends from the space between the outer coils 52 arranged at intervals to the space between the inner coils 51 and the outer coils 52, so that the container 4 and the suspension 3 correspondingly contained therein meet the position and angle arrangement, and the position interference between the container 4 and the superconducting magnet 5 is avoided.

Preferably, as shown in fig. 6, after the container 4 is inserted into the inner container 1 from one container wall of the inner container 1, the container 4 is connected to the other container wall of the inner container 1. In this embodiment, the container 4 extends into the inner container 1 from the first outer cylinder 11 of the inner container 1 and then is connected to the first end plate 12 of the inner container 1, so that the container 4 and the two container walls of the inner container 1 form an approximately triangular structure, thereby improving the structural strength of the inner container 1, and simultaneously, the force on the suspension member 3 can act on the two container walls of the inner container 1, thereby further improving the structural strength and rigidity of the entire cryostat.

Optionally, the container 4 may be connected to the inner coil 51 or the outer coil 52 after extending into the inner container 1, thereby further improving the strength and rigidity thereof.

Obviously, the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and for those skilled in the art, there are variations on the specific embodiments and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A cryostat, comprising:

the superconducting magnet device comprises an inner container (1) for containing a superconducting magnet (5), and a container (4) is concavely arranged on the outer wall of the inner container (1);

an outer container (2) which is covered outside the inner container (1); and

one end of the hanging piece (3) is connected with the outer container (2), and the other end of the hanging piece (3) extends into the container (4) and is connected with the cylinder bottom of the container (4).

2. A cryostat according to claim 1, characterized in that the cryostat comprises a plurality of said suspension elements (3).

3. A cryostat according to claim 1, characterized in that the cryostat comprises at least eight of said suspension elements (3), wherein parts of said suspension elements (3) are arranged symmetrically in a horizontal or vertical plane.

4. The cryostat according to claim 1, characterized in that the inner vessel (1) and the outer vessel (2) are both bodies of revolution, the inner vessel (1) comprising a first outer cylinder (11) and two first end plates (12), the outer vessel (2) comprising a second outer cylinder (21) and two second end plates (22),

one end of the container (4) is arranged on the first end plate (12), the other end of the container extends into the inner container (1), one end of the hanging piece (3) is connected with the second end plate (22), and the other end of the hanging piece is connected with the container (4); or

One end of the container (4) is arranged on the first outer cylinder (11), the other end of the container extends into the inner container (1), one end of the hanging piece (3) is connected with the second outer cylinder (21), and the other end of the hanging piece is connected with the container (4).

5. The cryostat according to claim 4, characterized in that the inner vessel (1) and the outer vessel (2) are both annular bodies of revolution, the inner vessel (1) being accommodated in the inner cavity of the outer vessel (2).

6. The cryostat according to any of claims 1 to 5, characterized in that the receptacle (4) is connected to one container wall of the inner container (1) after the receptacle (4) has been extended from the other container wall of the inner container (1) into the inner container (1).

7. The cryostat according to any of the claims 1 to 5, characterized in that the superconducting magnet (5) comprises an inner coil (51) and an outer coil (52), the outer coil (52) being nested in the inner coil (51), the bottom of the holder (4) extending between the inner coil (51) and the outer coil (52).

8. A cryostat according to any of claims 1 to 5, characterized in that a vacuum environment is present between the outer vessel (2) and the inner vessel (1).

9. The cryostat according to any of the claims 1 to 5, characterized in that a thermal radiation shield (6) is arranged between the inner vessel (1) and the outer vessel (2).

10. A nuclear magnetic resonance imaging apparatus, comprising a superconducting magnet (5) and a cryostat according to any of claims 1-9, the superconducting magnet (5) being arranged within the inner vessel (1).

Images