CN-122000164-A - Superconducting magnet device and magnetic resonance imaging device

CN122000164ACN 122000164 ACN122000164 ACN 122000164ACN-122000164-A

Abstract

Embodiments disclosed in the present specification and drawings relate to a superconducting magnet device and a magnetic resonance imaging device. One of the problems to be solved by the embodiments is to efficiently cool a plurality of structures to be cooled while reducing the amount of refrigerant. The superconducting magnet device of the embodiment is provided with a superconducting coil, a structure, a refrigerant tank, a heat exchanger, a refrigerator, a solid heat conductor, and a vacuum container. The superconducting coil is composed of superconducting wires forming a magnetic field. The structure is made of a superconductor and is electrically connected to the superconducting coil. The refrigerant tank stores a refrigerant. The heat exchanger is exposed to the inside of the refrigerant tank. The refrigerator cools the refrigerant. The solid heat conductor connects the refrigerant tank, the superconducting coil and the structure in a heat-conducting manner directly or indirectly. The superconducting coil or the structure is configured using at least two structures having different superconducting operating temperatures or superconducting characteristics.

Inventors

TOYA TAKEHIRO
KAWAMOTO HIROMI
MIZUNO KATSUTOSHI
Fu Yuzhenfan
KAJIWARA SHIGEO

Assignees

佳能医疗系统株式会社

Dates

Publication Date: 20260508
Application Date: 20251103
Priority Date: 20241106

Claims (12)

1. A superconducting magnet device is characterized by comprising: a superconducting coil composed of a superconducting wire material forming a magnetic field; A structure which is formed of a superconductor and is electrically connected to the superconducting coil; a refrigerant tank storing a refrigerant; a heat exchanger exposed to the inside of the refrigerant tank; a refrigerator that cools the refrigerant; a solid heat conductor directly or indirectly thermally connecting the refrigerant tank to the superconducting coil and the structure, and A vacuum vessel enclosing the superconducting coil, the structure, the refrigerant tank, the heat exchanger, the refrigerator, and the solid heat conductor; the superconducting coil or the structure is configured using at least two structures having different superconducting operating temperatures or superconducting characteristics.
2. The superconducting magnet device according to claim 1, wherein, The superconducting property is a critical temperature, a critical magnetic field, or a critical current.
3. A superconducting magnet apparatus according to claim 1 or 2, wherein, The superconducting coil or the structure is formed using at least two of a low-temperature superconducting material, a high-temperature superconducting material, a protective material, a base material, and a base material, which have different thermal conductivity or specific heat characteristics.
4. A superconducting magnet apparatus according to claim 1 or 2, wherein, The solid heat conductor is composed of a metal having a high thermal conductivity formed in a plate shape, an angular shape, a strip shape, or a sheet shape, or a metal formed in a tubular shape and having a thermal conductivity set according to a structure in contact with the solid heat conductor in a thermally conductive manner.
5. The superconducting magnet device according to claim 1 or 2, further comprising: a pipe for transporting the refrigerant from the refrigerant tank to at least one of the structure and the superconducting coil, and And a heat capacity holder attached to the solid heat conductor and holding the heat capacity of the solid heat conductor.
6. The superconducting magnet device according to claim 5, wherein, At least one member of the solid heat conductor, the piping, the heat capacity holder, and the heater is in thermally conductive contact with at least one portion of the superconducting coil and the structure having a small heat capacity, and at least two parameters of a size, a thermal conductivity, and a thermal load of the at least one member are set according to the operating temperature or the superconducting characteristic.
7. The superconducting magnet device according to claim 5, wherein, The solid heat conductor is in heat-conductive contact with at least one portion of the pipe.
8. A superconducting magnet apparatus according to claim 1 or 2, wherein, The solid heat conductor is in thermally conductive contact with at least one portion of the superconducting coil.
9. The superconducting magnet device according to claim 5, wherein, The superconducting coil or the structure comprises a high temperature superconducting material or a low temperature superconducting material, The superconducting coil or the structure is thermally conductive connected to one of a low temperature end and a high temperature end of the refrigerator via at least one of the refrigerant tank, the piping, the solid heat conductor, and the refrigerant.
10. The superconducting magnet device according to claim 5, wherein, The superconducting coil or the structure comprises a first superconducting coil or a first structure containing a low-temperature superconducting material, and a second superconducting coil or a second structure containing a high-temperature superconducting material; The first superconducting coil or the first structure is thermally conductively connected to a low-temperature end of the refrigerator via at least one of the refrigerant tank, the piping, the solid heat conductor, and the refrigerant, The second superconducting coil or the second structure is thermally conductively connected to a high-temperature end of the refrigerator via at least one of the refrigerant tank, the piping, the solid heat conductor, and the refrigerant.
11. The superconducting magnet device according to claim 9, wherein, The refrigerator includes one or more refrigerators each set to be capable of maintaining a superconducting state with respect to a heat load generated by a structure to be cooled, The superconducting coil is thermally conductively coupled to one of the one or more cryocoolers.
12. A magnetic resonance imaging apparatus comprising the superconducting magnet apparatus according to claim 1 or 2 as a static magnetic field magnet for generating a static magnetic field in an imaging space in which a subject is disposed.

Description

Superconducting magnet device and magnetic resonance imaging device Reference to related applications The present application enjoys the benefit of priority of japanese patent application No. 2024-194321, filed 11/6 of 2024, the entire contents of which are incorporated herein by reference. Technical Field Embodiments disclosed in the present specification and drawings relate to a superconducting magnet device and a magnetic resonance imaging (imaging) device. Background Conventionally, a magnetic resonance imaging (Magnetic Resonance Imaging:mri) apparatus is known, which includes a superconducting magnet apparatus as a static magnetic field magnet that generates a static magnetic field in an imaging space in which a subject is disposed. In general, a superconducting magnet device provided in an MRI apparatus includes a cooling container filled with a refrigerant such as liquid helium (helium), a refrigerator for cooling the refrigerant in the cooling container, and a superconducting coil (coil) immersed in the refrigerant in the cooling container. Here, the superconducting coil is made of a superconducting wire, and is energized in a state of being cooled by a refrigerant and being converted into a superconducting state, thereby generating a magnetic field. In recent years, in such a superconducting magnet apparatus, it has been demanded to efficiently cool a plurality of structures to be cooled while reducing the amount of refrigerant. Disclosure of Invention One of the problems to be solved by the embodiments disclosed in the present specification and the drawings is to efficiently cool a plurality of structures to be cooled while reducing the amount of refrigerant. However, the problems to be solved by the embodiments disclosed in the present specification and the drawings are not limited to the above-described problems. The problems corresponding to the effects of the respective configurations described in the embodiments described below may be located as other problems. The superconducting magnet device of the embodiment is provided with a superconducting coil, a structure, a refrigerant tank (tank), a heat exchanger, a refrigerator, a solid heat conductor, and a vacuum container. The superconducting coil is composed of superconducting wires forming a magnetic field. The structure is made of a superconductor and is electrically connected to the superconducting coil. The refrigerant tank stores a refrigerant. The heat exchanger is exposed to the inside of the refrigerant tank. The refrigerator cools the refrigerant. The solid heat conductor connects the refrigerant tank, the superconducting coil and the structure in a heat-conducting manner directly or indirectly. The vacuum container encloses the superconducting coil, the structure, the refrigerant tank, the heat exchanger, the refrigerator, and the solid heat conductor. The superconducting coil or the structure is configured using at least two structures having different superconducting operating temperatures or superconducting characteristics. Effects of According to the superconducting magnet device and the magnetic resonance imaging device of the embodiment, the plurality of structures to be cooled can be efficiently cooled while the amount of the refrigerant is reduced. Drawings Fig. 1 is a diagram showing an example of the structure of an MRI apparatus according to the first embodiment. Fig. 2 is a diagram showing an example of the superconducting magnet device of the comparative example of the first embodiment. Fig. 3 is a diagram showing an example of the superconducting magnet device according to the first embodiment. Fig. 4 is a diagram showing a modification of the superconducting magnet device according to the first embodiment. Fig. 5 is a diagram showing an example of the superconducting magnet device according to the second embodiment. Fig. 6 is a diagram showing an example of the superconducting magnet device according to the third embodiment. Fig. 7 is a diagram showing an example of the superconducting magnet device according to the fourth embodiment. Fig. 8 is a diagram showing an example of the superconducting magnet device according to the fifth embodiment. Fig. 9 is a diagram showing an example of the superconducting magnet device according to the sixth embodiment. Fig. 10 is a diagram showing an example of the superconducting magnet device according to the seventh embodiment. Fig. 11 is a diagram showing an example of the superconducting magnet device according to the eighth embodiment. Detailed Description Embodiments of the superconducting magnet device and the MRI apparatus according to the present application will be described in detail below with reference to the accompanying drawings. (First embodiment) Fig. 1 is a diagram showing an example of the structure of an MRI apparatus according to the first embodiment. For example, as shown in fig. 1, an MRI apparatus 100 includes a static field magnet 1, a gradient magnetic fiel