Method for maintaining refrigeration unit and refrigeration unit
AssigneeJapan Superconductor Technology Inc.
InventorsHitoshi MIYATA, Atsuko OKA
Life of this patent
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Abstract
A method for maintaining a refrigeration unit includes a connecting step of connecting a refrigerator body to a vacuum case with a first cooling stage in thermal contact with a radiation shield, where in the connecting step, the fastening force of the fastening member is adjusted such that the temperature of the first cooling stage becomes a target temperature.
Claims6
A method for maintaining a refrigeration unit used for a superconducting magnet device including a superconducting coil, a radiation shield housing the superconducting coil, and a vacuum case housing the radiation shield, the refrigeration unit including a first cooling stage for cooing the radiation shield, a second cooling stage for cooling the superconducting coil, and a refrigerator body attachable to the vacuum case, the method comprising
- a connecting step of connecting the refrigerator body to the vacuum case with the first cooling stage in thermal contact with the radiation shield, wherein
- in the connecting step, a fastening force of a fastening member is adjusted such that a temperature of the first cooling stage becomes a target temperature, the fastening member being for fixing the refrigerator body to the vacuum case and being configured to adjust, through adjustment of the fastening force of the fastening member, a contact pressure of the first cooling stage to the radiation shield or a heat conduction member in thermal contact with the radiation shield.
A refrigeration unit used for a superconducting magnet device including a superconducting coil, a radiation shield housing the superconducting coil, and a vacuum case housing the radiation shield, the refrigeration unit comprising:
- a refrigerator including a first cooling stage for cooing the radiation shield, a second cooling stage for cooling the superconducting coil, and a refrigerator body attachable to the vacuum case with the first cooling stage in thermal contact with the radiation shield;
- a temperature sensor connected to the first cooling stage;
- a fastening member configured to detachably connect the refrigerator body to the vacuum case and to adjust, through adjustment of a fastening force of the fastening member, a contact pressure of the first cooling stage to the radiation shield or a heat conduction member in thermal contact with the radiation shield;
- and
- a stroke adjusting member that is provided between the fastening member and the vacuum case, configured to produce a fastening resistance against fastening of the fastening member by contact with the fastening member, and to elastically deform by compression such that a distance between the fastening member and the vacuum case gradually decreases as the fastening force of the fastening member increases against the fastening resistance.
Dependencies are inferred from the claim text.