JP4219880B2 - Refrigeration system with moving mechanism for cooling magnetic field generator - Google Patents

Description

  The present invention relates to a refrigeration apparatus with a moving mechanism for cooling a magnetic field generator.

  Recently, a method of directly cooling a superconducting bulk body and a superconducting coil (superconducting magnet) with a refrigerator without using a refrigerant such as liquid nitrogen or liquid helium has been adopted.

However, since the refrigerator head (valve switching motor) and the like do not operate normally in a strong magnetic field, when the refrigerator is used in a strong magnetic field, the refrigerator head is made of a superconducting bulk body or a superconducting coil (superconducting magnet). Therefore, it is necessary to connect the refrigerator head and the superconducting bulk body or superconducting coil using a material having good thermal conductivity such as copper.
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  However, when the heat conductive member connecting the refrigerator head and the superconducting bulk body or the superconducting coil becomes long, due to the thermal contraction of the heat conductive member generated from a large temperature difference between the set state at room temperature and the cooled state, There is a problem in that the position of a magnetic field generator such as a superconducting bulk body or a superconducting coil and the refrigeration apparatus outer tub change relatively, and the gap increases. In an apparatus intended to generate a magnetic field, this gap affects the magnitude of the generated magnetic field, so it is desirable that the gap be as narrow as possible.

  In view of the above situation, an object of the present invention is to provide a refrigeration apparatus with a moving mechanism for cooling a magnetic field generator that is structurally strong and has a length adjusting function.

In order to achieve the above object, the present invention provides
[1] In a refrigeration apparatus with a moving mechanism for cooling a magnetic field generator, an extension rod made of a heat conductor connected to the refrigerator head, a magnetism generator provided at the tip of the extension rod, and surrounding the extension rod A plurality of outer cylinders, a vacuum container of the magnetic field generating device formed at a distal end portion of the outer cylinder on the distal end side of the plurality of outer cylinders, and a relative relationship between a distal end portion of the outer cylinder on the distal end side An outer cylinder length adjusting mechanism for changing the position, and the change in length caused by the temperature of the extension rod is adjusted by the outer cylinder length adjusting mechanism to the tip of the vacuum vessel and the magnetic field generator. The gap g is adjustable .

  [2] In the refrigeration apparatus with a moving mechanism for cooling a magnetic field generator according to [1], the length adjustment mechanism of the outer cylinder includes a sliding mechanism of a side seal portion having a flange supported by a plurality of bolts. It is characterized by that.

  [3] In the refrigeration apparatus with a moving mechanism for cooling a magnetic field generator according to [1] above, the outer cylinder length adjusting mechanism includes a bellows device having a flange supported by a plurality of bolts. .

  [4] In the refrigeration apparatus with a moving mechanism for cooling a magnetic field generator according to [1], the length adjustment mechanism of the outer cylinder is a telescope type apparatus having a flange supported by a plurality of bolts. A refrigeration apparatus with a moving mechanism for cooling the magnetic field generator.

  [5] The refrigeration apparatus with a moving mechanism for cooling a magnetic field generator according to [1] above, wherein a load supporting member having a multilayer structure is provided between an outer cylinder and an extension rod in the vicinity of the magnetic field generator. .

  [6] The refrigeration apparatus with a moving mechanism for cooling a magnetic field generator according to the above [5], wherein the multiple structure load support mechanism comprises a heat insulating FRP load support member.

  [7] In the refrigeration apparatus with a moving mechanism for cooling a magnetic field generator according to the above [5] or [6], the extension rod is supported on the outer cylinder via a low heat intrusion load support member. Even if a heavy object is installed at the tip, it can be supported.

  [8] In the refrigeration apparatus with a moving mechanism for cooling a magnetic field generator according to the above [7], the load support member has a structure in which a substantially U-shaped cylinder is combined to secure a heat insulation distance, The extension rod is supported in a balanced manner.

  According to the present invention, the following effects can be achieved.

  (1) The position of the magnetic field generator can be set accurately.

  (2) The support of the magnetic field generator can be strengthened.

In a refrigeration apparatus with a moving mechanism for cooling a magnetic field generator, an extension bar made of a heat conductor connected to a refrigerator head, a magnetic field generator provided at the tip of the extension bar, and the extension bar are arranged to surround the extension bar. A plurality of outer cylinders, a vacuum container of the magnetic field generator formed at a distal end portion of the outer cylinder on the distal end side of the plurality of outer cylinders, and a relative position of the distal end portion of the outer cylinder on the distal end side. And a gap g between the tip of the vacuum vessel and the magnetic field generator by the length adjustment mechanism of the outer cylinder. Make it adjustable . Therefore, the position of the magnetic field generator can be accurately set.

  A load supporting member having a multi-cylindrical structure is provided between the outer cylinder and the extension rod in the vicinity of the magnetic field generator. Therefore, the magnetic field generator can be firmly supported.

  Hereinafter, embodiments of the present invention will be described in detail.

  FIG. 1 is an overall configuration diagram of a refrigeration apparatus with a moving mechanism for cooling a magnetic field generator according to a first embodiment of the present invention, FIG. 2 is a schematic diagram for explaining the operation thereof, and FIG. 2 (b) shows a state where the extension rod is contracted by cooling, and FIG. 2 (c) shows a state where the outer cylinder is contracted.

  In these drawings, 1 is a motor for driving a high-pressure and low-pressure gas switching valve, 2 is a refrigerator head including a livestock cooling material, 4 is a first extension rod (heat conductor), 5 is an extension rod flange, 7 is a first 2 is an extension cylinder (thermal conductor), 8 is an outer cylinder base, 9 is a first extension outer cylinder connected to the outer cylinder base 8, 10 is an extension outer cylinder flange, 11 is a slide flange, 12 is an outer The cylinder moving flange, 13 is four fixing bolts, 14 is a second extension outer cylinder, 15 is a multiple FRP load support member (thermal insulating material) as a multiple cylinder load support member, A cylindrical second FRP load support element 15 </ b> A having a closed tip and a second cylindrical outer cylinder 14 disposed so as to be slidable. FRP load support element 15B. Reference numeral 16 denotes a ring-shaped adjustment member interposed between the first FRP load support element 15A and the second FRP load support element 15B, and fixes these FRP load support members 15 together. 17 is a side seal portion, 18 is a magnetic field generator (superconducting bulk body or superconducting coil) fixed to the tip of the second extension rod 7, 19 is a vacuum container at the tip of the outer tube, and the inside of the outer tube is vacuumed It can be held.

Therefore, first, as shown in FIG. 2A, the cooling device with a moving mechanism for cooling the magnetic field generator of the present invention is set up at room temperature. A gap g between the vacuum container 19 and the magnetic field generator 18 at this time is defined as a ₁ .

Next, as shown in FIG. 2 (b), when cooling the refrigerator head 2, extension rod 4 and 7 for thermally shrinking, the gap g of the vacuum vessel 19 and the magnetic field generator 18 becomes spread a _2.

  Here, the amount of shrinkage (thermal shrinkage ratio of copper) of the extension rods 4 and 7 is about 0.3% from room temperature to 50K. This means that if the extension rod is 1 m, for example, it contracts by 3 mm.

In order to narrow the spread gap a _2, sliding the outer cylinder moving flange 12 to the right in FIG. As a result, the second extension outer cylinder 14, the FRP load support member 15 and the adjustment member 16, and the vacuum vessel 19 also slide to the right, so that the vacuum vessel 19 and the magnetic field generator 18 are shown in FIG. Can be returned to the initial gap a ₁ .

  With this configuration, the gap g between the magnetic field generator 18 and the vacuum container 19 is not affected by the thermal contraction of the extension rod due to cooling.

  In addition, when the conductive member (here, the extension rods 4 and 7) connecting the refrigerator head 2 and the magnetic field generator 18 (superconducting bulk body or superconducting coil) becomes long and the magnetic field generator 18 at the tip becomes heavy, only the conductive member is present. Then, in order to avoid the problem that the support cannot be sufficiently performed, in the present invention, an FRP load support member (thermal insulating material) 15 is provided as a load support member having a multilayer structure. In addition, as a load support member having a multilayer structure, for example, a multi-cylindrical structure or a load divided into a part of the circumference, not illustrated, but not divided in the axial direction or formed entirely in the circumference. A support member may be formed.

  Further, the FRP load support member 15 will be described in detail.

  For example, all necessary electromagnetic forces such as levitation, propulsion, and guidance of a floating railway are applied to the superconducting coil in the cryogenic region. The force applied to the superconducting coil is finally transmitted to the normal temperature region, and becomes a force for propelling and levitating the vehicle.

  For this reason, as an important part of the superconducting magnet, there is an adiabatic load support member that connects the superconducting coil inner tank in the cryogenic region and the room temperature region. This adiabatic load supporting member is required to stably transmit the above-described electromagnetic force and to minimize heat penetration into the cryogenic region.

  Therefore, in the present invention, a load supporting member 15 having a multi-cylindrical structure is employed as an example of the heat insulating load supporting member. This multi-cylinder load support member has a structure in which a plurality of FRP (fiber reinforced plastics) cylinders are mainly combined, and consideration is given to securing the distance of the heat conduction path. In addition, CFRP (carbon fiber reinforced plastics) using carbon fiber can be adopted in the region below the liquid nitrogen temperature, and GFRP (glass fiber reinforced plastics) using glass fiber can be adopted in the region above the liquid nitrogen temperature. That is, it is possible to select one having more advantageous heat conduction characteristics in each temperature region.

  Recently, adoption of ALFRP (aluminum fiber reinforced plastics) using alumina fibers has been promoted. This is because the alumina fiber has the desirable properties of having both the above-described excellent properties of CFRP and GFRP in the entire temperature range and high rigidity.

  In the present invention, the heat-supporting support member made of the material as described above has a multi-cylindrical structure, so that the load support can be balanced.

  Further, in the present invention, the mechanical stress caused by the difference in expansion coefficient due to the temperature difference between the outer cylinder and the extension rod disposed inside the outer cylinder is used as a heat insulating material between the outer cylinder and the extension rod. The FRP load support member is provided, and the extension rod and the FRP load support member are slidably disposed so as to avoid the occurrence of mechanical stress due to thermal contraction.

  Further, by supporting the extension rod on the outer cylinder via a low heat intrusion load support member, the extension rod can be stably supported even if a heavy object is installed at the tip of the extension rod. Furthermore, by supporting the outer cylinder, even heavy objects can be supported with low heat penetration without burdening the refrigeration apparatus.

  In addition, the load support member can have a U-shaped combination, and can support the extension rod in a balanced manner while ensuring a heat insulation distance. Further, even if the extension rod is thermally contracted, no extra stress is generated.

  When the heat insulation distance is insufficient, heat intrusion can be suppressed by concentrically stacking a plurality of load supporting materials having different diameters.

  FIG. 3 is an overall configuration diagram of a refrigeration apparatus with a moving mechanism for cooling a magnetic field generator according to a second embodiment of the present invention, FIG. 4 is a schematic diagram showing the operation thereof, and FIG. FIG. 4B shows a state where the extension rod is contracted by cooling, and FIG. 4C shows a state where the outer cylinder is contracted. The same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and the description thereof is omitted.

  In this embodiment, as shown in FIG. 3, the length adjustment mechanism of the outer cylinder is performed by a bellows device. That is, an extended bellows device (for example, made of stainless steel) 22 is disposed between the outer cylinder moving flange 12 and the fixing flange 21, and the outer cylinder corresponds to the thermal contraction of the extension rods 4 and 7. 4 (c), the outer cylinder moving flange 12 is slid to move the second extension outer cylinder 14, and the four bellows devices 22 are contracted as shown in FIG. Secure with bolts 13.

  As described above, the outer cylinder length adjusting mechanism having a simpler configuration can be provided.

  FIG. 5 is an overall configuration diagram of a refrigeration apparatus with a moving mechanism for cooling a magnetic field generator according to a third embodiment of the present invention, FIG. 6 is a schematic diagram showing the operation thereof, and FIG. FIG. 6B shows a state where the extension rod is contracted by cooling, and FIG. 6C shows a state where the outer cylinder is contracted. 1 and 2 are denoted by the same reference numerals, and description thereof is omitted.

  In this embodiment, as shown in FIG. 5, the length adjustment mechanism of the outer cylinder is performed by a telescope type device. That is, between the outer cylinder moving flange 12 and the fixing flange 21, an extended telescoping device 31, for example, a telescopic stainless inner cylinder 32 and an outer cylinder 33 are arranged. A gasket (packing made of a material that is difficult to deform) 34 is provided inside the outer end portion of the outer cylinder 33.

  When the outer cylinder is contracted, as shown in FIG. 6C, the outer cylinder moving flange 12 is slid to move the second extension outer cylinder 14, and the telescopic device 31 is contracted. It is fixed by four fixing bolts 13.

  Since it comprised in this way, the length adjustment mechanism of an outer cylinder can be provided with a simpler structure.

  In addition, when replacing the magnetic field generator, the gap between the magnetic field generator and the vacuum vessel can be reduced without changing the outer cylinder by applying the present invention, and the generated magnetic field can be used effectively. Can do.

  The length adjusting mechanism of the present invention is effective in improving workability even in the work of adding an extension bar.

  Furthermore, even when magnetizing using a superconducting coil that generates a strong magnetic field when the magnetic field generator is magnetized, the refrigerator head and its high-pressure and low-pressure gas switching valve driving motors are arranged at remote positions. As a result, the influence of the strong magnetic field of the superconducting coil on the refrigerator head and its high-pressure and low-pressure gas switching valve drive motor can be reduced.

  In addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible and these are not excluded from the scope of the present invention.

  The refrigeration apparatus with a moving mechanism for cooling a magnetic field generator of the present invention can be used as a cooling apparatus for a magnetic field generator such as a superconducting bulk body or a superconducting coil.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole block diagram of the freezing apparatus with the moving mechanism for magnetic field generator cooling which shows 1st Example of this invention. It is a schematic diagram which shows operation | movement of the freezing apparatus with the moving mechanism for magnetic field generator cooling which shows 1st Example of this invention. It is a whole block diagram of the freezing apparatus with the moving mechanism for magnetic field generator cooling which shows 2nd Example of this invention. It is a schematic diagram which shows operation | movement of the freezing apparatus with the moving mechanism for magnetic field generator cooling which shows 2nd Example of this invention. It is a whole block diagram of the freezing apparatus with the moving mechanism for magnetic field generator cooling which shows 3rd Example of this invention. It is a schematic diagram which shows operation | movement of the freezing apparatus with the moving mechanism for magnetic field generator cooling which shows 3rd Example of this invention.

Explanation of symbols

1 High-pressure and low-pressure gas switching valve drive motor 2 Refrigerator head 4 First extension rod (thermoconductor)
5 Extension rod flange 7 Second extension rod (thermoconductor)
8 Outer cylinder base 9 First extension outer cylinder 10 Extension outer cylinder flange 11 Slide flange 12 Flange for moving outer cylinder 13 Four fixing bolts 14 Second extension outer cylinder 15 FRP load support member (thermal insulating material)
15A Tubular first FRP load support element 15B Tubular second FRP load support element 16 Ring-shaped adjustment member 17 Side seal portion 18 Magnetic field generator (superconducting bulk body or superconducting coil)
19 Vacuum container 21 Fixing flange 22 Bellows device 31 Telescope type device 32 Inner cylinder 33 Outer cylinder 34 Gasket

Claims (8)

(A) an extension rod made of a heat conductor connected to the refrigerator head;
(B) a magnetic field generator provided at the tip of the extension rod;
(C) a plurality of outer cylinders arranged so as to surround the extension rod;
(D) a vacuum container of the magnetic field generator formed at the tip of the outer cylinder on the tip side of the plurality of outer cylinders;
(E) an outer cylinder length adjusting mechanism that changes a relative position of a distal end portion of the outer cylinder on the distal end side ;
(F) A refrigeration apparatus with a moving mechanism for cooling a magnetic field generator, wherein the gap g between the tip of the vacuum vessel and the magnetic field generator can be adjusted by a length adjustment mechanism of the outer cylinder .   2. The refrigerating apparatus with a moving mechanism for cooling a magnetic field generator according to claim 1, wherein the length adjusting mechanism of the outer cylinder includes a sliding mechanism of a side seal portion having a flange supported by a plurality of bolts. A refrigeration apparatus with a moving mechanism for cooling a magnetic field generator.   2. The refrigeration apparatus with a moving mechanism for cooling a magnetic field generator according to claim 1, wherein the length adjusting mechanism of the outer cylinder comprises a bellows device having a flange supported by a plurality of bolts. Refrigeration system with moving mechanism.   2. The refrigeration apparatus with a moving mechanism for cooling a magnetic field generator according to claim 1, wherein the length adjusting mechanism of the outer cylinder comprises a telescope type device having a flange supported by a plurality of bolts. Refrigeration equipment with moving mechanism for equipment cooling.   2. The refrigeration apparatus with a moving mechanism for cooling a magnetic field generator according to claim 1, further comprising a multi-layered load support member between an outer cylinder and an extension rod in the vicinity of the magnetic field generator. Refrigeration system with moving mechanism.   6. The refrigeration apparatus with a moving mechanism for cooling a magnetic field generator according to claim 5, wherein the multiple structure load support mechanism comprises a heat insulating FRP load support member. .   The refrigeration apparatus with a moving mechanism for cooling a magnetic field generator according to claim 5 or 6, wherein the support of the extension rod is borne by the outer cylinder via a low heat intrusion load support member, and a heavy object is installed at the tip of the extension rod. A refrigeration apparatus with a moving mechanism for cooling a magnetic field generator, characterized in that it can be supported.   8. The refrigeration apparatus with a moving mechanism for cooling a magnetic field generator according to claim 7, wherein the load support member has a structure in which a cylinder having a substantially U-shaped cross section is combined, so that the extension rod is secured while ensuring a heat insulation distance. A refrigeration apparatus with a moving mechanism for cooling a magnetic field generator, which is supported in a balanced manner.

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