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7 条记录 (耗时 0.021 秒)

    Heat transfer head for a Stirling cycle machine
    1.
    发明授权
    Heat transfer head for a Stirling cycle machine 失效
    用于斯特林循环机的换热头

    公开(公告)号：US5076058A

    公开(公告)日：1991-12-31

    申请号：US559181

    申请日：1990-07-27

    申请人： Stuart G. Emigh ,  Jack E. Noble ,  Gregory A. Lehmann

    发明人： Stuart G. Emigh ,  Jack E. Noble ,  Gregory A. Lehmann

    IPC分类号： F02G1/044 ,  F02G1/055

    CPC分类号： F02G1/044 ,  F02G1/055 ,  F02G2244/50 ,  F02G2254/30 ,  F02G2255/20 ,  F28F1/16 ,  F28F2215/06

    摘要： A common heat acceptor is provided between opposed displacers in a Stirling cycle machine. It includes two sets of open channels in separate fluid communications with the expansion spaces of the receptive cyclinders. The channels confine movement of working fluid in separate paths that extend between the expansion space of one cylinder and the compression space of the other. The method for operating the machine involves alternatively directing working fluid from the expansion space of each cylinder in a fluid path leading to the compression space of the other cylinder and from the compression space of each cylinder in a fluid path leading to the expansion space of the other cylinder.

    摘要翻译： 在斯特林循环机中的相对的置换器之间提供常见的受热器。 它包括两组开放通道，与接受性气旋器的膨胀空间分开进行流体通信。 通道将工作流体的运动限制在在一个气缸的膨胀空间和另一个气缸的压缩空间之间延伸的分开的路径中。 用于操作机器的方法包括：将来自每个气缸的膨胀空间的工作流体交替地引导到通向另一个气缸的压缩空间的流体路径中的工作流体，以及在通向所述气缸的膨胀空间的流体路径中的每个气缸的压缩空间 其他气缸。

    Pulse tube cryocooler system for magnetic resonance superconducting magnets
    2.
    发明授权
    Pulse tube cryocooler system for magnetic resonance superconducting magnets 有权
    用于磁共振超导磁体的脉冲管低温冷却系统

    公开(公告)号：US06807812B2

    公开(公告)日：2004-10-26

    申请号：US10391872

    申请日：2003-03-19

    申请人： Gregory A. Lehmann ,  Roy A. Mangano ,  Clifford J. Ginfrida ,  Kathleen W. McGuinness

    发明人： Gregory A. Lehmann ,  Roy A. Mangano ,  Clifford J. Ginfrida ,  Kathleen W. McGuinness

    IPC分类号： F17C502

    CPC分类号： F25D19/006 ,  F25B9/10 ,  F25B9/145 ,  F25B2400/17 ,  G01R33/3815

    摘要： A magnetic resonance assembly comprising, a liquid cryogen vessel, a liquid cryogen cooled conducting magnet disposed within the liquid cryogen vessel, a closed vaccum vessel surrounding the liquid cryogen vessel and spaced from the liquid cryogen vessel, a cooling device fixably attached to the vacuum vessel operable for providing cryogenic temperatures to the superconducting magnet, a heat exchanger device in thermal contact with the liquid cryogen vessel operable for heat exchange, and a bus bar in thermal contact with the cooling device and the heat exchanger device. The cooling device may be a pulse tube cryocooler capable of providing temperatures of about 4 K. A thermal bus bar of high purity aluminum or copper is used to connect and provide a spatial separation of a pulse tube cryocooler and a remote recondenser unit, thus reducing the overall height of the magnet assembly.

    摘要翻译： 一种磁共振组件，包括液体冷冻剂容器，设置在液体冷冻剂容器内的液体冷冻剂冷却的导电磁体，围绕液体冷冻剂容器并与液体冷冻剂容器间隔开的封闭真空容器，可固定地连接到真空容器的冷却装置 可操作以向超导磁体提供低温温度;与可操作用于热交换的液体冷冻剂容器热接触的热交换器装置，以及与冷却装置和热交换器装置热接触的汇流条。 冷却装置可以是能够提供约4K的温度的脉冲管低温冷却器。使用高纯度铝或铜的热母线连接并提供脉冲管低温冷却器和远程再冷凝器单元的空间分离，从而减少 磁体组件的整体高度。

    MRI magnet vibration induced field instability simulator
    4.
    发明授权
    MRI magnet vibration induced field instability simulator 失效
    MRI磁体振动诱发场不稳定模拟器

    公开(公告)号：US06822446B2

    公开(公告)日：2004-11-23

    申请号：US10065037

    申请日：2002-09-12

    申请人： Timothy J. Havens ,  Longzhi Jiang ,  Gregory A. Lehmann

    发明人： Timothy J. Havens ,  Longzhi Jiang ,  Gregory A. Lehmann

    IPC分类号： G01V300

    CPC分类号： G01R33/28 ,  G01R33/3854 ,  G01R33/58

    摘要： A Magnetic Resonance Imaging (MRI) magnet field instability simulator (80) is provided. The simulator includes a rigid body motion generator (82) that simulates motion of one or more MRI system components. An eddy current analyzer (84) generates a magnetic stiffness and damping signal and an electromagnetic transfer function in response to the motions and a cryostat material properties signal. A mechanical model generator (86) generates a mechanical disturbance signal and a mechanical model of one or more MRI system components in response to the motions and the magnetic stiffness and damping signal. A structural analyzer (88) generates a motion signal in response to the mechanical model. A field instability calculator (90) generates a field instability signal in response to the electromagnetic transfer function and the motion signal. A method of performing the same is also provided.

    摘要翻译： 提供磁共振成像（MRI）磁场不稳定性模拟器（80）。 模拟器包括模拟一个或多个MRI系统部件的运动的刚体运动发生器（82）。 涡流分析器（84）响应于运动和低温恒温器材料特性信号产生磁刚度和阻尼信号和电磁传递函数。 机械模型发生器（86）响应于运动和磁刚度和阻尼信号产生一个或多个MRI系统部件的机械干扰信号和机械模型。 结构分析器（88）响应于机械模型产生运动信号。 场不稳定性计算器（90）响应于电磁传递函数和运动信号产生场不稳定信号。 还提供了一种执行该方法的方法。

    Mechanical stabilizer-tuned damper for high field open magnet
    6.
    发明授权
    Mechanical stabilizer-tuned damper for high field open magnet 失效
    用于高磁场开放磁体的机械稳定调节阻尼器

    公开(公告)号：US06636136B1

    公开(公告)日：2003-10-21

    申请号：US09737084

    申请日：2000-12-14

    申请人： Michael J. Radziun ,  Scott T. Mansell ,  Andrew T. Bollinger ,  Long-Zhi Jiang ,  Gregory A. Lehmann ,  Timothy J. Havens ,  Yu Wang

    发明人： Michael J. Radziun ,  Scott T. Mansell ,  Andrew T. Bollinger ,  Long-Zhi Jiang ,  Gregory A. Lehmann ,  Timothy J. Havens ,  Yu Wang

    IPC分类号： H01F500

    CPC分类号： G01R33/3806 ,  G01R33/3802 ,  G01R33/3854 ,  H01F6/00 ,  H01F27/06 ,  H01F27/33

    摘要： A mechanical stabilizer-tuned damper is attachable to the first upper magnet assembly of a high field open magnet, which magnet includes a first upper magnet assembly, a lower second magnet assembly and at least one non-magnetizable support beam therebetween. The mechanical stabilizer-tuned damper reduces the dynamic response of the magnet. A connecting device is provided which consists of a threaded rod mounted to an attachment bracket through a linear bearing and vibration mount. A series of non-magnetic and extremely low conductivity plates of various weights are attachable to the rod to change the mass and the tuning frequency of the damper. The location and size of the mechanical stabilizer-tuned damper are determined to balance the frequency of the field oscillation and physical room. The direction of orientation depends upon the direction of motion to be dampened or controlled.

    摘要翻译： 机械稳定器调节的阻尼器可附接到高场开放磁体的第一上磁体组件，该磁体包括第一上磁体组件，下第二磁体组件和它们之间的至少一个不可磁化的支撑梁。 机械稳定调节阻尼器减小了磁体的动态响应。 提供了一种连接装置，其由通过线性轴承和振动支架安装到附接支架的螺杆组成。 一系列具有各种重量的非磁性和极低导电性板可连接到杆上以改变阻尼器的质量和调谐频率。 确定机械稳定器调节阻尼器的位置和尺寸，以平衡场振荡和物理室的频率。 取向的方向取决于要抑制或控制的运动方向。

    Mounting system and RF shield for high field open magnet
    7.
    发明授权
    Mounting system and RF shield for high field open magnet 失效
    用于高场开放磁体的安装系统和射频屏蔽

    公开(公告)号：US06384602B1

    公开(公告)日：2002-05-07

    申请号：US09471547

    申请日：1999-12-23

    申请人： Michael J. Radziun ,  Long-Zhi Jiang ,  Gregory A. Lehmann ,  Gregory F. Hayworth ,  Kenneth E. Gurt

    发明人： Michael J. Radziun ,  Long-Zhi Jiang ,  Gregory A. Lehmann ,  Gregory F. Hayworth ,  Kenneth E. Gurt

    IPC分类号： G01V300

    CPC分类号： G01R33/422 ,  G01R33/3806

    摘要： A secure and stable mounting system for High Field Open (HFO) magnets. A stainless steel mounting plate is secured to the RF screen room floor and the HFO magnet is secured to the mounting plate. Metal angle members are welded around the perimeter edges of the steel plate, and brass wool is inserted between the angle members and the copper sheeting on the floor of the screen room. The invention minimizes magnet motion and thus reduces the risk of image phase ghosting. The invention also provides RF screen room integrity.

    摘要翻译： 用于高场开放（HFO）磁体的安全稳定的安装系统。 不锈钢安装板固定在RF屏幕室地板上，HFO磁铁固定在安装板上。 金属角构件焊接在钢板的周边边缘上，黄铜毛被插入在角构件和屏幕室地板上的铜片之间。 本发明使磁体运动最小化，从而降低图像相位重影的风险。 本发明还提供RF屏幕室的完整性。