Patent ID: 8934950
Filing Date: 2015-01-13
Classification: G01R

Abstract:
1. A superconducting magnet system for nuclear magnetic resonance with a high magnetic field and a high degree of homogeneity of magnetic field, said superconducting magnet system comprising: a main coil, a low-temperature vessel, a room-temperature space, liquid helium, a lifting rod, a first refrigerator, a liquid helium condensing refrigerator, a quench blast valve, a second refrigerator, an external vacuum vessel, a 80K radiation shielding screen, a 40K radiation shielding screen, an annular girder supporting structure, a lifting wheel, an aspirating hole, a bottom saddle support, an axial restricting draw rod, a heat radiation shielding screen, a magnetic field homogeneity compensating coil and a liquid helium condenser; said main coil and said magnetic field homogeneity compensating coil constitute a superconducting magnet, and are both formed by winding NbTi/Cu superconducting wires; said magnetic field homogeneity compensating coil is coaxially wound around the outer surface of said main coil; said superconducting magnet is lifted inside said low-temperature vessel by said lifting rod, liquid helium is stored by said low-temperature vessel; said low-temperature vessel has the room-temperature space; said 40K radiation shielding screen is placed around the outer surface of said low-temperature vessel, said 80K radiation shielding screen is placed around the outer surface of said 40K radiation shielding screen, the outer surface of said 80 k radiation shielding screen is connected to said external vacuum vessel by means of a draw rod; and said first refrigerator, said liquid helium condensing refrigerator, said quench blast valve, and said second refrigerator are mounted on said external vacuum vessel; wherein said first refrigerator is connected with said 40K radiation shielding screen, said second refrigerator is connected with said 80K radiation shielding screen, and said liquid helium condensing refrigerator is connected with said low-temperature vessel and said liquid helium condenser inside said low-temperature vessel; said external vacuum vessel is stably supported by means of said annular girder supporting structure and said bottom saddle support; the outer surface of the connection portion between said low-temperature vessel and said external vacuum vessel is wrapped with said heat radiation shielding screen; at the bottom of the outer surface of said external vacuum vessel, there is said aspirating hole; said superconducting magnet is axially positioned by said axial restricting draw rod and is radially positioned by said lifting wheel.