CN214624623U - Superconducting magnet structure and magnetic resonance imaging equipment - Google Patents
Superconducting magnet structure and magnetic resonance imaging equipment Download PDFInfo
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- CN214624623U CN214624623U CN202121018489.7U CN202121018489U CN214624623U CN 214624623 U CN214624623 U CN 214624623U CN 202121018489 U CN202121018489 U CN 202121018489U CN 214624623 U CN214624623 U CN 214624623U
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Abstract
The utility model discloses a superconducting magnet structure and magnetic resonance imaging equipment belongs to superconducting magnetism technical field. This superconducting magnet structure includes a vacuum section of thick bamboo, the coolant liquid jar, cold screen and a cold head cavity, the coolant liquid jar, in the accommodation space in a vacuum section of thick bamboo is all arranged in to cold screen and cold head cavity, the coolant liquid jar is used for the coolant liquid of holding cooling superconducting coil, the circumference setting of cold screen encircleing the coolant liquid jar, it has a plurality of first conductors to distribute along circumference on the cold screen, be provided with in the cold head cavity can with the second conductor of cold head butt, heat-conduction connection between second conductor and at least one first conductor. The first conductor on the cold screen is in heat conduction connection with the second conductor in the cold head cavity, so that cooling is more sufficient through direct contact, liquid ammonia volatilization of the superconducting magnet structure is reduced, further single cold head refrigeration can be realized, the whole superconducting magnet structure is simplified, manufacturing cost is reduced, the pressure inside the structure can be reduced, and the whole structure is safer.
Description
Technical Field
The utility model relates to a superconducting magnet technical field especially relates to a superconducting magnet structure and magnetic resonance imaging equipment.
Background
The superconducting magnet structure includes a superconducting magnet, which is a magnet fabricated using superconducting coils. At low temperature, the superconducting coil can operate without resistance, so the superconducting coil has great advantages and is widely applied to the fields of industry, scientific research, medical treatment and the like.
In order to keep the superconducting coil in a low-temperature environment, the superconducting magnet structure adopts a cold shield to refrigerate the superconducting coil. In order to improve the uniformity of the temperature of the cold shield, the conventional superconducting magnet structure adopts double cold heads which are symmetrically arranged at two sides of the cold shield for refrigeration, so that the structure is complex, the refrigeration cost is high, and the improvement effect on the uniformity of the temperature of the cold shield is limited.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a superconducting magnet structure, this superconducting magnet structure's compact structure, with low costs, and cold shield temperature is even.
To achieve the purpose, the utility model adopts the following technical proposal:
a superconducting magnet structure comprising a vacuum canister having a receiving space, the superconducting magnet structure further comprising, disposed within the receiving space:
the cooling liquid tank is used for containing cooling liquid for cooling the superconducting coil;
the cold screen is arranged around the circumference of the cooling liquid tank, and a plurality of first conductors are distributed on the cold screen along the circumference;
the cold head cavity is internally provided with a second conductor which can be abutted against the cold head, and the second conductor is in heat conduction connection with at least one first conductor.
Preferably, the superconducting magnet structure further includes a power line, one end of the power line is electrically connected to the superconducting coil, the other end of the power line penetrates through the cold head cavity, and the power line abuts against the second conductor.
Preferably, the superconducting magnet structure further comprises a signal wire, and the signal wire is arranged through the cold head cavity and abutted against the second conductor.
Preferably, the first conductor is a copper bar.
Preferably, the second conductor is a copper block.
Preferably, the second conductor and the first conductor are connected by copper tape in a heat conduction mode.
Preferably, the superconducting magnet structure further comprises a service cavity, one end of the service cavity is communicated with the cooling liquid tank, and the other end of the service cavity penetrates through the vacuum cylinder.
Preferably, a platform is arranged on the vacuum cylinder, and the cold head cavity and the service cavity are both arranged on the platform.
Preferably, the cooling liquid tank is a liquid helium tank, and the cooling liquid is liquid helium.
Another object of the present invention is to provide a magnetic resonance imaging apparatus, which has high working stability, high safety and low manufacturing cost.
To achieve the purpose, the utility model adopts the following technical proposal:
a magnetic resonance imaging device comprises the superconducting magnet structure.
The utility model has the advantages that:
the utility model provides a superconducting magnet structure, this superconducting magnet structure includes a vacuum section of thick bamboo, the cooling fluid reservoir, cold screen and a cold head cavity, the cooling fluid reservoir, in the accommodation space in a vacuum section of thick bamboo is all arranged in to cold screen and cold head cavity, the cooling fluid reservoir is used for the coolant liquid of holding cooling superconducting coil, the circumference setting of cold screen encircleing the cooling fluid reservoir, it has a plurality of first conductors to distribute along circumference on the cold screen, be provided with in the cold head cavity can with the second conductor of cold head butt, connect heat-conduction between second conductor and at least one first conductor and be connected. The first conductor on the cold screen is in heat conduction connection with the second conductor in the cold head cavity, so that cooling is more sufficient through direct contact, liquid ammonia volatilization of the superconducting magnet structure is reduced, further single cold head refrigeration can be realized, the whole superconducting magnet structure is simplified, manufacturing cost is reduced, the pressure inside the structure can be reduced, and the whole structure is safer.
The embodiment also provides a magnetic resonance imaging apparatus which improves the working safety and the working stability and reduces the manufacturing cost by using the superconducting magnet structure.
Drawings
Fig. 1 is a schematic structural diagram of a superconducting magnet structure provided by the present invention;
fig. 2 is a partially enlarged view of a portion a in fig. 1.
Fig. 3 is a schematic structural diagram of a cold head cavity and a service cavity of a superconducting magnet structure provided by the present invention.
In the figure:
1. a vacuum cylinder; 2. a cooling liquid tank; 3. cooling the screen; 4. a first conductor; 5. a cold head cavity; 6. a second conductor; 7. copper strips; 8. a power line; 9. a signal line; 10. a service cavity.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The present embodiment provides a superconducting magnet structure, as shown in fig. 1, which includes a vacuum cylinder 1, a coolant liquid tank 2, a superconducting coil (not shown in the figure), a cold shield 3 and a cold head cavity 5. The vacuum cylinder 1 is a cylindrical structure made of a nonmagnetic material, such as stainless steel, and in the present embodiment, the vacuum cylinder 1 is a cylindrical structure made of a nonmagnetic material. The vacuum cylinder 1 is internally provided with a containing space, and the cooling liquid tank 2, the superconducting coil, the cold shield 3 and the cold head cavity 5 are all arranged in the containing space.
The cooling liquid tank 2 is used for containing cooling liquid, the superconducting coil is arranged in the cooling liquid tank 2, and at least part of the superconducting coil is soaked in the cooling liquid. Alternatively, the cooling liquid tank 2 is a liquid helium tank and the cooling liquid is liquid helium. Liquid helium can provide a cryogenic environment for the superconducting coil, for example, at a liquid helium temperature of (-269 c) at an absolute temperature of 4.2K, thereby allowing the superconducting coil to maintain its superconducting properties when placed in liquid helium. Of course, in other embodiments, the cooling liquid and the cooling liquid tank 2 which can provide a low-temperature environment for the superconducting coil and do not affect the normal operation of the superconducting coil are also applicable to the superconducting magnet structure in the present embodiment. Further alternatively, the liquid helium tank is of a cylindrical structure disposed coaxially with the vacuum cylinder 1.
The cold shield 3 is mainly used for reducing the heat leakage of indoor heat to the superconducting coil, and as shown in fig. 1, the cold shield 3 is of an annular structure and is sleeved outside the cooling liquid tank 2 along the circumferential direction of the cooling liquid tank 2. Optionally, in this embodiment, the cold shield 3 has a ring-shaped structure.
As shown in fig. 1 and 2, a plurality of first conductors 4 are circumferentially distributed on the cold shield 3, preferably uniformly distributed, the first conductors 4 are strip-shaped structures made of metal with good heat conductivity, and the cross-sectional shapes of the strip-shaped structures can be regular shapes such as circles, squares and ellipses or irregular shapes according to requirements. Optionally, the first conductors 4 are copper bars made of copper, each copper bar is connected to the inner wall surface of the cold shield 3 along a direction parallel to the central axis of the cold shield 3, and the plurality of copper bars are uniformly distributed on the inner wall surface of the cold shield 3 and are arranged in a circular array by taking the central axis of the cold shield 3 as the center. Copper has good heat conductivity at low temperature, and the temperature of the cold shield 3 can be more uniform by uniformly distributing a plurality of copper ribs on the cold shield 3. Of course, in other embodiments, other metals with good thermal conductivity may also be used to fabricate the first conductor 4, which is not described herein.
Further optionally, in order to improve the connection strength between the cold shield 3 and the copper bars and improve the heat conduction performance between the cold shield 3 and the copper bars, in this embodiment, the copper bars are selected to be cylindrical or have a cylindrical structure with a circular arc surface, so as to increase the contact area and the connection area between the copper bars and the cold shield 3. The connection mode of the cold shield 3 and the copper bars can adopt welding. Of course, in other embodiments, a plurality of copper bars may also be uniformly distributed on the outer wall surface of the cold shield 3; or a plurality of copper ribs are uniformly distributed on the inner wall surface of the cold shield 3 and the outer wall surface of the cold shield 3. Of course, a plurality of copper ribs can also be welded on the wall surface of the cold shield 3 in a cross manner to form a net-shaped structure, so that the uniformity of the temperature of the cold shield 3 is further improved.
The cold head cavity 5 is mainly used for realizing connection between a cold head of the refrigerator and the cold shield 3, and the existing refrigerator can be used for the superconducting magnet structure in the embodiment, and specific structures of the refrigerator and the cold head are not described herein. In this embodiment, owing to be provided with many copper bars on cold screen 3, utilize many copper bars to conduct heat on cold screen 3, consequently compare and need set up two cold head cavities 5 and two cold heads in prior art and refrigerate, in this embodiment, only need set up a cold head cavity 5, utilize a cold head can make 3 temperatures of cold screen more even. The structure of the superconducting magnet structure is simplified to a great extent by reducing the number of the cold head cavities 5 and the number of the cold heads, and the manufacturing cost of the superconducting magnet structure is reduced.
Specifically, be provided with second conductor 6 on the cold head cavity 5, heat-conduction connection between second conductor 6 and the first conductor 4 makes the cooling more abundant through direct contact, has reduced the liquid ammonia volatilization of superconducting magnet structure. The second conductor 6 is a block structure made of a material with good heat conductivity, in this embodiment, the second conductor 6 is a copper block, and the copper block is placed in the cold head cavity 5. The heat conduction connection is specifically a connection between the first conductor 4 and the second conductor 6, which is made of a material with good thermal conductivity, for example, a strip-shaped conductive strip structure, in this embodiment, a copper strip 7 is arranged between the first conductor 4 and the second conductor 6, one end of the copper strip 7 is connected to a copper block, and the other end is connected to a copper rib. Optionally, the copper strip 7 and the copper block, the copper strip 7 and the copper rib are all welded, so that the contact thermal resistance of the joint is reduced, the refrigeration efficiency of the cold head on the cold screen 3 is improved, and the further reduction of the temperature of the cold screen 3 is facilitated.
As shown in fig. 3, the superconducting magnet structure further includes a service cavity 10, the service cavity 10 is a communication channel for communicating the inside and the outside of the superconducting magnet structure, and in the prior art, the service cavity 10 is commonly used as a lead-out path of the power line 8, a lead-out path of the signal line 9, an infusion port passage, an exhaust passage, and the like.
A superconducting magnet (not shown) placed in a room temperature environment is powered by a power supply system in the superconducting environment through a power supply line 8, wherein the power supply line 8 is a relatively thick copper wire or stainless steel wire for charging the superconducting coil, and in this embodiment, one end of the power supply line 8 is electrically connected with the superconducting coil, and the other end of the power supply line passes through the cold head cavity 5 and passes through the copper block. With such an arrangement, the passage of the service chamber 10 can be smooth, so that the helium gas discharge resistance can be reduced when the superconducting magnet structure is quenched, and the maximum pressure of the superconducting magnet structure can be rapidly reduced.
The signal line 9 is the electrical wiring for some detectors and controllers inside the superconducting magnet structural system, and in this embodiment, the signal line 9 is also disposed through the cold head cavity 5. So set up, can make service cavity 10 only regard as transfusion mouth passageway and exhaust passage to use to it is more smooth and easy to make service cavity 10's passageway, further reduces the discharge resistance of helium when the superconducting magnet structure takes place the quench phenomenon, reduces the inside pressure of structure, improves whole security.
In addition, the superconducting magnet structure can be designed by considering lower design pressure and adopting thinner materials. By reducing the design pressure of the whole superconducting magnet structure, the thickness of the material can be reduced under the condition of the same material, so that the heat can be reduced and led into the inside of the superconducting magnet structure, and zero volatilization of liquid helium can be realized.
In summary, compared with the dual cold head refrigeration in the prior art, the superconducting magnet structure in this embodiment has the copper bars with good thermal conductivity uniformly distributed on the cold shield 3, so that the temperature of the cold shield 3 can be uniform by only arranging a single cold head, thereby achieving the purpose of zero volatilization of liquid helium.
In addition, compared with the power line 8 and the signal line 9 penetrating the service cavity 10 in the prior art, the cooling path is: copper block-copper strips 7 in the cooling cavity-copper block-power cord 8 and signal line 9 in service cavity 10, in this embodiment, through shifting the position of wearing to establish of the line body such as power cord 8 and signal line 9 in to cold head cavity 5 by service cavity 10 to make the line body directly contact with the copper block, thereby make the cooling route become copper block-power cord 8 and signal line 9 in the cooling cavity, so set up and reduced the intermediate junction, improved the refrigerated sufficiency, reduced the heat that gets into this superconducting magnet structure inside through power cord 8 and signal line 9.
The present embodiment also provides a magnetic resonance imaging apparatus including the superconducting magnet structure described above. Because the superconducting magnet structure is an important component of the magnetic resonance imaging equipment, and the superconducting magnet structure in the embodiment is connected through the direct-contact heat conduction, so that the cooling is more sufficient, the volatilization of liquid ammonia of the superconducting magnet structure is reduced, the refrigeration of a single cold head is realized, the whole superconducting magnet structure is simplified, the manufacturing cost is reduced, the pressure inside the structure is reduced, the whole structure is safer, the working safety and the working stability of the magnetic resonance imaging equipment are greatly improved, and the manufacturing cost is also reduced.
It is obvious that 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. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. 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 superconducting magnet structure comprising a vacuum canister (1), the vacuum canister (1) having an accommodation space, characterized in that the superconducting magnet structure further comprises, disposed in the accommodation space:
the cooling liquid tank (2), the said cooling liquid tank (2) is used for holding the cooling liquid which cools the superconducting coil;
the cold screen (3) is arranged around the circumferential direction of the cooling liquid tank (2), and a plurality of first conductors (4) are distributed on the cold screen (3) along the circumferential direction;
the cold head cavity (5) is internally provided with a second conductor (6) which can be abutted against the cold head, and the second conductor (6) is in heat conduction connection with at least one first conductor (4).
2. Superconducting magnet structure according to claim 1,
the superconducting magnet structure further comprises a power line (8), one end of the power line (8) is electrically connected with the superconducting coil, the other end of the power line penetrates through the cold head cavity (5) to be arranged, and the power line (8) is abutted to the second conductor (6).
3. Superconducting magnet structure according to claim 1,
the superconducting magnet structure further comprises a signal wire (9), and the signal wire (9) penetrates through the cold head cavity (5) and is abutted to the second conductor (6).
4. Superconducting magnet structure according to claim 1,
the first conductor (4) is a copper rib.
5. Superconducting magnet structure according to claim 4,
the second conductor (6) is a copper block.
6. Superconducting magnet structure according to claim 5,
the second conductor (6) and the first conductor (4) are in heat conduction connection through a copper strip (7).
7. Superconducting magnet structure according to claim 1,
the superconducting magnet structure further comprises a service cavity (10), one end of the service cavity (10) is communicated with the cooling liquid tank (2), and the other end of the service cavity penetrates through the vacuum cylinder (1).
8. Superconducting magnet structure according to claim 7,
the vacuum cylinder (1) is provided with a platform, and the cold head cavity (5) and the service cavity (10) are both arranged on the platform.
9. Superconducting magnet structure according to any of claims 1-8,
the cooling liquid tank (2) is a liquid helium tank, and the cooling liquid is liquid helium.
10. A magnetic resonance imaging apparatus comprising a superconducting magnet structure according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121018489.7U CN214624623U (en) | 2021-05-13 | 2021-05-13 | Superconducting magnet structure and magnetic resonance imaging equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121018489.7U CN214624623U (en) | 2021-05-13 | 2021-05-13 | Superconducting magnet structure and magnetic resonance imaging equipment |
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| Publication Number | Publication Date |
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| CN214624623U true CN214624623U (en) | 2021-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121018489.7U Active CN214624623U (en) | 2021-05-13 | 2021-05-13 | Superconducting magnet structure and magnetic resonance imaging equipment |
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| CN (1) | CN214624623U (en) |
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- 2021-05-13 CN CN202121018489.7U patent/CN214624623U/en active Active
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