Cryostat devices for magnetic resonance imaging and methods for making

    公开(公告)号:US12129971B2

    公开(公告)日:2024-10-29

    申请号:US17456654

    申请日:2021-11-29

    摘要: The cryostat may include an inner vessel configured to accommodate one or more superconducting coils, an outer vessel encompassing the inner vessel, and a thermal shield configured between the outer vessel and the inner vessel. The thermal shield may include an internal cylinder having a first end and an external cylinder encompassing the internal cylinder, the external cylinder having a second end. The thermal shield may also include a seal head configured between the internal cylinder and the external cylinder, the seal head having a first edge and a second edge. The thermal shield may further include a connecting component including a plurality of connectors. Each of the plurality of connectors may be configured to connect the first end of the internal cylinder with the first edge of the seal head and/or the second end of the external cylinder with the second edge of the seal head.

    Remotely driven cryocooler for a superconducting generator

    公开(公告)号:US12066233B2

    公开(公告)日:2024-08-20

    申请号:US17256313

    申请日:2018-06-29

    摘要: A cryocooler assembly including at least one remotely driven cryocooler operable between an ON-state of operation and an OFF-state of operation and defining a first stage of the cryocooler assembly. A liquefaction cup in fluidic communication with a cryogenic fluid reservoir, wherein a plurality of conduits thermally couple the liquefaction cup to the fluid reservoir and define a second stage of the cryocooler assembly. The cryocooler assembly further including one or more of a valve, a gas/liquid switch, an actuating support arm and a heat pipe coupled to the second stage of the cryocooler assembly to remotely disconnect a heat path generated by the at least one remotely driven cryocooler between the first stage and the second stage during the OFF-state of operation. A superconducting generator including at least one remotely driven cryocooler assembly and method of operating a cooling assembly for a superconducting generator utilizing at least one remotely driven cryocooler assembly are disclosed.

    STIRLING ENGINE WITH NEAR ISOTHERMAL WORKING SPACES

    公开(公告)号:US20240271835A1

    公开(公告)日:2024-08-15

    申请号:US18565287

    申请日:2022-05-31

    申请人: Jonathan Nord

    发明人: Jonathan Nord

    IPC分类号: F25B9/14 F02G1/043 F02G1/055

    CPC分类号: F25B9/14 F02G1/0435 F02G1/055

    摘要: A single-acting (two pistons) or double-acting (four pistons) alpha configuration Stirling engine has increased thermal exchange between a hot piston crown and a hot head and between a cold piston crown and a cold head of each piston cylinder assembly, increasing conversion of thermal energy to mechanical motion. The thermal exchange is provided by presenting corresponding transverse peaks and valley that create increased surface area and increased convective fluid flow rate for a working gas sealed in the Stirling engine.

    EXPANDER UNIT WITH MAGNETIC SPRING FOR A SPLIT STIRLING CRYOGENIC REFRIGERATION DEVICE

    公开(公告)号:US20240128118A1

    公开(公告)日:2024-04-18

    申请号:US18534711

    申请日:2023-12-10

    申请人: CRYO TECH LTD.

    发明人: Alexander VEPRIK

    IPC分类号: H01L21/683 B23B31/30 F25B9/14

    摘要: An expander unit of a cryogenic refrigerator device includes a moving assembly with a porous regenerative heat exchanger configured to move back and forth along a longitudinal axis. A magnetic spring assembly includes a stationary magnetic assembly fixed to the cold finger base that includes one or more magnetic rings fixedly arranged about a bore. A movable magnetic assembly includes one or more movable magnetic rings fixed to the moving assembly, An outer lateral dimension of each of the movable magnetic rings is less than an inner lateral dimension of the bore. The stationary magnetic assembly and the movable magnetic assembly are configured such that, when the moving assembly is displaced along the longitudinal axis from an equilibrium position, attractive and repulsive forces between the movable magnetic assembly and the stationary magnetic assembly yield a restoring force that is directed to restore the moving assembly to the equilibrium position.

    Dilution refrigerator with continuous flow helium liquefier

    公开(公告)号:US11913714B2

    公开(公告)日:2024-02-27

    申请号:US18051992

    申请日:2022-11-02

    摘要: A dilution refrigerator, such as for a quantum computing system, includes a cryostat having a plurality of temperature-controlled flanges inside a vacuum chamber. A dilution unit is disposed inside the cryostat and operable to cool a first group of the flanges. A continuous flow helium refrigerator is in heat transfer communication with a lowest temperature flange of a second group of flanges, disposed at progressively lower temperatures that are greater than those of the first group of flanges, to provide primary cooling thereto to a first temperature. The continuous flow helium refrigerator resides at least partially in the cryostat and includes a helium liquefier and a first closed-loop circuit thermally coupling the helium liquefier to the lowest temperature flange of the second group of flanges. The helium liquefier provides liquid helium to the lowest temperature flange of the second group of flanges via the first closed-loop circuit.

    PUSH-PULL COMPRESSOR HAVING ULTRA-HIGH EFFICIENCY FOR CRYOCOOLERS OR OTHER SYSTEMS

    公开(公告)号:US20190048863A1

    公开(公告)日:2019-02-14

    申请号:US15676808

    申请日:2017-08-14

    申请人: Raytheon Company

    摘要: A method includes generating a first varying electromagnetic field using a first voice coil of a first actuator. The method also includes repeatedly attracting and repelling a first magnet of the first actuator based on the first varying electromagnetic field. The first voice coil is connected to a first piston of a compressor, and the first magnet is connected to an opposing second piston of the compressor. Attracting the first magnet narrows a space between the pistons, and repelling the first magnet enlarges the space between the pistons. The method may further include generating a second varying electromagnetic field using a second voice coil of a second actuator and repeatedly attracting and repelling a second magnet of the second actuator based on the second varying electromagnetic field. The second voice coil may be connected to the second piston, and the second magnet may be connected to the first piston.