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公开(公告)号：EP1148403A3
公开(公告)日：2004-11-17
申请号：EP01201406.4
申请日：2001-04-18
IPC分类号： G05D23/19 , G05D23/275
CPC分类号： G05D23/275 , G05D23/1909
摘要： Described herein is a temperature control system for cooling magnetic elements (14) in MRI apparatus (10). The control system comprises a wax (16) in contact with the elements (14) which is substantially maintained at its phase transition temperature between a solid state and a liquid state, but in a substantially solid state. A sensor (18) is immersed in the wax (16) and operates to provide a signal on the change of state of the wax (16). The sensor (18) is connected to a controller (20) which controls the operation of a heating element (26) also immersed in the wax (16) to control the temperature thereof. When the MRI apparatus is operational, heat is generated by the magnetic elements (14) is used to change the wax (16) to a liquid, this change being detected by the sensor (18) which sends signals to the controller (20) to turn off the heating element (26). Once, the sensor (18) detects that the wax (16) has reverted to a substantially solid state, the controller (20) turns the heating element (26) on to maintain the wax (16) at its phase transition temperature but in a substantially solid form.
摘要翻译： 本文描述了用于冷却MRI设备（10）中的磁性元件（14）的温度控制系统。 控制系统包括与元件（14）接触的蜡（16），蜡（16）基本保持在固态和液态之间的相变温度，但基本上处于固态。 传感器（18）浸没在蜡（16）中并操作以提供关于蜡（16）的状态改变的信号。 传感器（18）连接到控制器（20），控制器（20）控制也浸没在蜡（16）中的加热元件（26）的操作以控制其温度。 当MRI设备可操作时，由磁性元件14产生的热量用于将蜡16变成液体，这种变化由向控制器20发送信号的传感器18检测到， 关闭加热元件（26）。 一旦传感器（18）检测到蜡（16）已经回复到基本上固态，控制器（20）就开启加热元件（26）以将蜡（16）保持在其相变温度但保持在 基本上固体形式。
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公开(公告)号：EP1436555A2
公开(公告)日：2004-07-14
申请号：EP02785278.9
申请日：2002-10-21
IPC分类号： F25B9/14
CPC分类号： F25B9/145 , F25B9/10 , F25B2309/1408 , F25B2309/1414 , F25B2400/17 , F25D19/006
摘要： The present invention relates to pulse tube refrigerators for recondensing cryogenic liquids. In particular, the present invention relates to the same for magnetic resonance imaging systems. In many cryogenic applications components, e.g. superconducting coils for magnetic resonance imaging (MRI), superconducting transformers, generators, electronics, are cooled by keeping them in contact with a volume of liquified gases (e.g. Helium, Neon, Nitrogen, Argon, Methane). Any dissipation in the components or heat getting into the system causes the volume to part boil off. To account for the losses, replenishment is required. This service operation is considered to be problematic by many users and great efforts have been made over the years to introduce refrigerators that recondense any lost liquid right back into the bath. The present invention addresses the problems arising from convection which occurs within a pulse tube refrigerator. The invention provides in a first aspect, a pulse tube refrigerator PTR arrangement within a cryogenic apparatus, wherein a PTR is operable within an insertion sock associated with a housing of the cryogenic apparatus for the placement of the PTR such that a first end is exposed to room temperature and a second end is associated with a cryogenic fluid, wherein the tubes of the PTR are surrounded by an insulating 2s sleeve. This configuration has been shown to reduce convection and problems associated therewith.
摘要翻译： 本发明涉及用于再冷凝低温液体的脉冲管制冷机。 具体而言，本发明涉及用于磁共振成像系统的方法。 在许多低温应用组件中，例如 用于磁共振成像（MRI）的超导线圈，超导变压器，发生器，电子设备通过保持与一定体积的液化气体（例如氦气，氖气，氮气，氩气，甲烷）接触而被冷却。 组件中的任何耗散或进入系统的热量都会导致体积部分沸腾。 为了弥补亏损，需要补货。 这种服务操作被许多用户认为是有问题的，并且多年来已经付出了巨大的努力来引入冰箱，将任何丢失的液体重新注入浴室。 本发明解决了在脉管制冷机内发生的对流问题。 本发明在第一方面提供了一种在低温设备内的脉冲管制冷机PTR布置，其中PTR可在与低温设备的壳体相关联的插入袜内操作，用于放置PTR，使得第一端暴露于 室温并且第二端与低温流体相关联，其中PTR的管被绝缘套筒包围。 该配置已被证明可以减少对流和与之相关的问题。
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公开(公告)号：EP1148403A2
公开(公告)日：2001-10-24
申请号：EP01201406.4
申请日：2001-04-18
IPC分类号： G05D23/19
CPC分类号： G05D23/275 , G05D23/1909
摘要： Described herein is a temperature control system for cooling magnetic elements (14) in MRI apparatus (10). The control system comprises a wax (16) in contact with the elements (14) which is substantially maintained at its phase transition temperature between a solid state and a liquid state, but in a substantially solid state. A sensor (18) is immersed in the wax (16) and operates to provide a signal on the change of state of the wax (16). The sensor (18) is connected to a controller (20) which controls the operation of a heating element (26) also immersed in the wax (16) to control the temperature thereof. When the MRI apparatus is operational, heat is generated by the magnetic elements (14) is used to change the wax (16) to a liquid, this change being detected by the sensor (18) which sends signals to the controller (20) to turn off the heating element (26). Once, the sensor (18) detects that the wax (16) has reverted to a substantially solid state, the controller (20) turns the heating element (26) on to maintain the wax (16) at its phase transition temperature but in a substantially solid form.
摘要翻译： 这里描述了一种用于冷却MRI设备（10）中的磁性元件（14）的温度控制系统。 控制系统包括与元件（14）接触的蜡（16），其基本上保持在固态和液态之间但处于基本固态的相变温度。 传感器（18）浸入蜡（16）中并且操作以提供关于蜡（16）的状态变化的信号。 传感器（18）连接到控制器（20），控制器（20）控制也浸没在蜡（16）中的加热元件（26）的操作以控制其温度。 当MRI装置可操作时，由磁性元件（14）产生热量以将蜡（16）改变为液体，该变化由传感器（18）检测，该传感器向控制器（20）发送信号至 关闭加热元件（26）。 一旦传感器（18）检测到蜡（16）已经恢复到基本上固态，则控制器（20）将加热元件（26）打开以将蜡（16）保持在其相变温度，但是在 基本上是固体形式。
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公开(公告)号：EP0677751B1
公开(公告)日：2000-10-18
申请号：EP95104102.9
申请日：1995-03-20
IPC分类号： G01R33/3873
CPC分类号： G01R33/3873
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公开(公告)号：EP1020679A2
公开(公告)日：2000-07-19
申请号：EP99124120.9
申请日：1999-12-01
CPC分类号： F17C13/087 , F17C2203/014 , F17C2203/0687 , F17C2270/0536
摘要： Described herein is an improved suspension system for cryostat vessels forming a part of magnetic resonance imaging (MRI) apparatus. The MRI apparatus comprises an outer cylindrical element, an inner cylindrical element mounted within the outer element, and a suspension system for accurately mounting the inner element with respect to the outer element. The suspension system comprises a plate (40) pivotally mounted on the inner cylindrical element (10) for rotation relative thereto and a pair of continuous bands (66, 68) connecting the plate (40) to the outer element. Adjusters are positioned offset from the axis of rotation of the plate for tensioning the bands. Locking means are also provided to retain the plate in a given position relative to the outer element.
摘要翻译： 本文描述了用于形成磁共振成像（MRI）装置的一部分的低温恒温器的改进的悬挂系统。 MRI装置包括外圆柱形元件，安装在外元件内的内圆筒元件和用于相对于外元件精确地安装内元件的悬挂系统。 该悬挂系统包括一个可旋转地安装在内部圆柱形元件（10）上用于相对于其旋转的板（40）和连接板（40）与外部元件的一对连续带（66,68）。 调节器定位成偏离板的旋转轴线，以张紧带。 还提供锁定装置以将板保持在相对于外部元件的给定位置。
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公开(公告)号：EP0905435A3
公开(公告)日：1999-09-01
申请号：EP98116962.6
申请日：1998-09-08
发明人： Stautner, Wolfgang
CPC分类号： F17C3/085 , F17C2203/0687 , F17C2221/017 , F17C2227/0353 , F17C2270/0509 , F25B9/10 , F25B9/145 , F25B2309/1425 , F25D19/006
摘要： The various components, namely the different vessels contained within each other for housing the superconducting magnet, or the liquid comprising a cryostat or storage tank for cryogenic liquids are generally either suspended or supported by each other. Thus, a support/suspension system has various tasks, besides carrying the magnet or shield loads, it also keeps the position of the cold mass during shipping and also fixes the internal clearances between the radiation shields during installation as well as repeated cooldown. The various constraints put onto these suspension systems result in an increased input of heat into the cryostat depending on the overall size of cryostat and superconducting magnet system. Various parts of the cryogenic components such as radiation shields have to be cooled, either by means of using liquids or by using forced convection cooling, or by other external means such as conventional GM-cryocoolers. The present invention therefore provides a new type of support or suspension system which combines the two functions mentioned above, namely supporting or suspending and cooling, and applies these to the pulse tube cooler. The pulse tubes (22-38) could be arranged in series or in parallel, could be single or multi-staged or feature an additional liquefying stage and suspend or support a superconducting magnet or HTS conductor within a cryostat. The pulse tube being either a suspension or support member could also simultaneously cool the shields 26 connected to it and at the same time carry shield or magnet loads.
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8.发明公开
公开(公告)号：EP0860707A2
公开(公告)日：1998-08-26
申请号：EP97103012.7
申请日：1997-02-25
IPC分类号： G01R33/38
CPC分类号： G01R33/3806 , G01R33/381
摘要： An open electromagnet including a pair of field coils which respectively comprise juxtaposed poles of the electromagnet between which an imaging volume of substantially homogeneous magnetic field is defined, toroidal shielding coil means arranged on a locus which forms a loop, so that when energised, the said shielding coil means produces a controlling magnetic field which configures a magnetic flux return path for the field coils so that the magnetic flux return path describes the said loop, and a support structure which serves rigidly to support the shielding coil means and the field coils.
摘要翻译： 通过布置屏蔽线圈5来限定环路，并且通过适当地激励线圈5以使得焊剂被限制为跟随环路，来消除大量铁限定C型MRI磁体中返回路径的要求。 屏蔽线圈5可以由单个连续绕组代替。 主励磁线圈1a，2a和屏蔽线圈5可以由低温恒温器中的非磁性结构支撑。 描述了校正线圈1e，1f，2e，2f和校正环（1b，1c，2b，2c，图2）。 可能有多个通量返回路径。
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公开(公告)号：EP0785442A1
公开(公告)日：1997-07-23
申请号：EP97100405.6
申请日：1997-01-13
发明人： Byrne, Alex Francis
IPC分类号： G01R33/38 , G01R33/3815 , G01R33/421
CPC分类号： G01R33/3806
摘要： An open electromagnet including a pair of field coils which respectively comprise juxtaposed poles of the electromagnet between which an imaging volume of substantially homogeneous magnetic field is defined, a support structure which serves rigidly to support the field coils in spaced apart relationship, wherein the support structure comprises two steel plates between which the field coils are positioned, the relative position of the field coils and the plates being such, having regard to the magnetic field strength of the electromagnet, that forces of magnetic attraction between the field coils are at least partly counter-balanced by forces of attraction between the plates and the field coils, whereby force on the field coils and their associated support structure due to the forces of attraction between the poles is significantly reduced or nullified.
摘要翻译： 一种包括一对励磁线圈的开放式电磁铁，它们分别包括电磁体的并置磁极，其间限定有基本上均匀的磁场的成像体积;支撑结构，其以刚性的方式间隔地支撑励磁线圈，其中支撑结构 包括两个钢板，励磁线圈定位在其间，考虑到电磁体的磁场强度，励磁线圈和板的相对位置是这样的，磁场线圈之间的磁吸引力至少部分是反向的 由平板和励磁线圈之间的吸引力平衡，由于极点之间的吸引力，励磁线圈及其相关的支撑结构上的力明显减小或无效。
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公开(公告)号：EP0561077B1
公开(公告)日：1995-07-19
申请号：EP92308828.0
申请日：1992-09-28
发明人： Grime, David Anthony
CPC分类号： F17C13/026 , F17C6/00 , F17C2221/017 , F17C2223/0161 , F17C2270/0509
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