JP2010016082A - Vacuum insulating container and vacuum insulating device - Google Patents

Abstract

There is provided a vacuum heat insulating container capable of easily adjusting the position of an object to be cooled in a vacuum container.
A vacuum heat insulating container (10A) has a structure in which a storage container (11) storing a refrigerant (20) and a cooled object (14) attached to the storage container (11) are accommodated inside a vacuum container (12). Is provided with a position adjusting mechanism 17 that adjusts the position of the cooled object 14 by moving. The position adjusting mechanism 17 includes an elastic body 15 having elasticity and an actuator 16 that applies pressure to the storage container 11. The elastic body 15 supports the storage container 11 and the body 14 to be cooled, and the actuator 16 stores the elastic body 15. The position of the cooled object 14 is adjusted by moving the container 11 and extending the elastic body 15.
[Selection] Figure 1

Description

  The present invention relates to a vacuum heat insulating container whose inside is kept at a very low temperature and a vacuum heat insulating device including the vacuum heat insulating container.

  Recently, various devices utilizing the superconducting phenomenon have been developed. For example, a superconducting material is used for a coil for a strong magnetic field magnet used in a nuclear magnetic resonance analyzer (NMR) or a magnetic resonance imaging (MRI). A coil (superconducting coil) made using a wire made of a superconducting material can flow a large current by utilizing a phenomenon peculiar to superconducting materials that the electric resistance becomes zero, thereby generating a strong magnetic field. Can be made.

  Instead of the superconducting coil, a so-called superconducting bulk magnet can be used. A superconducting bulk magnet is a superconducting bulk (single crystal) that is cooled from the superconducting critical temperature in a magnetic field and is pinned in the superconducting bulk during the transition to the superconducting state. Even if the external magnetic field is made zero in this state, a strong magnetic field can be continuously generated, and no current supply is required. By using a superconducting bulk magnet, it is possible to reduce the size of the device including the cooling structure.

  A superconducting quantum interference device (SQUID) is known as an element utilizing the superconducting phenomenon, and this SQUID can measure a weak magnetic signal of 1 / 1,000,000 or less of geomagnetism. It has been applied to devices for elucidating brain functions and diagnosing the heart. In addition, application to nondestructive inspection devices, foreign matter detection devices, etc. by measuring magnetic disturbance is also being studied.

  In these superconducting coils, superconducting bulk magnets, and SQUIDs, a container for realizing the cryogenic temperature that is the operating temperature is required. As a container for realizing an extremely low temperature, a vacuum heat insulating container in which a refrigerant such as liquid nitrogen [boiling point: 77K (−196 ° C.)] or liquid helium [boiling point: 4.2K (−269 ° C.)] is enclosed is used. Generally, the vacuum heat insulating container has a structure in which a storage container for storing a refrigerant is supported in the vacuum container so that a vacuum layer is formed around the storage container. The SQUID or the like is installed in the storage container or attached to the outside of the storage container, and is cooled by heat conduction from the refrigerant through the storage container.

  In such a vacuum insulated container, the storage container is cooled and contracted when the refrigerant is filled. One end of the storage container is fixed to the vacuum container and the other part is contractible so that the heat storage does not damage the storage container. Therefore, the storage container is thermally contracted toward the fixed end. For example, in the case of a storage container that cools a superconducting bulk magnet, the magnetic field strength on the outer surface of the vacuum container decreases if the superconducting bulk magnet is greatly separated from the wall surface of the vacuum container due to thermal contraction of the storage container. . In the case of a storage container that cools the SQUID, if the SQUID is greatly separated from the wall surface of the vacuum container due to the thermal contraction of the storage container, the magnetic detection sensitivity is lowered.

As a method for solving such a problem, for example, a superconducting magnetic sensor (attached to the lower part of the storage container) is provided by providing a screw part in the vacuum container and making the vacuum container itself movable in the direction of heat shrinkage of the storage container. There has been proposed a vacuum heat insulating container that freely adjusts the distance between the SQUID and the wall surface of the vacuum container (see, for example, Patent Document 1). Further, the heat shrinkage amount of the support portion and the heat shrinkage amount of the heat conductor are set so that the heat shrinkage amount of the heat conductor attached with the sensor using the superconductivity is the same. There has been proposed a vacuum heat insulating container having a structure in which the amount of heat shrinkage becomes zero when the direction is reversed (see, for example, Patent Document 2). Furthermore, a vacuum insulation container having a structure in which heat shrinkage is made zero by using a special material that thermally expands at a very low temperature as a part of the storage container, and a vacuum having a structure in which an object to be inspected is installed inside the vacuum container. Insulated containers have been proposed (see, for example, Patent Documents 3 and 4).
JP 2000-180008 A JP 2006-294664 A JP-A-8-167742 JP-A-9-119918

  However, in the vacuum heat insulating container disclosed in Patent Document 1, a seal portion is provided to make the inside of the vacuum container vacuum while the screwed portion between the storage container and the vacuum container is set to a normal pressure atmosphere. The seal portion slides with the storage container and the vacuum container when the storage container and the vacuum container are relatively rotated, and does not have a high function of maintaining the inside of the vacuum container in a vacuum atmosphere. Therefore, there is a problem that the degree of vacuum in the vacuum container is lowered, and the radiant heat from the vacuum container to the storage container is increased. On the other hand, if the threaded portion is tight, the degree of vacuum in the vacuum vessel is maintained, but a large force is required for the relative rotation operation between the storage vessel and the vacuum vessel. Moreover, in the vacuum heat insulation container disclosed by patent document 2, 3, there exists a problem that the distance between a to-be-cooled body and a vacuum container cannot be adjusted arbitrarily. Furthermore, in the vacuum heat insulation container of Patent Document 4, there is a problem that work such as replacement of an inspection object becomes complicated.

  This invention is made | formed in view of this situation, and provides the vacuum heat insulation container which can perform the position adjustment of the to-be-cooled body in a vacuum vessel easily, and the vacuum heat insulation apparatus provided with this vacuum heat insulation container. With the goal.

  A vacuum heat insulating container according to the present invention accommodates a body to be cooled and a refrigerant storage container that stores a refrigerant for cooling the body to be cooled, and stores the refrigerant using a stretchable elastic body. While supporting a container with respect to a vacuum container, a refrigerant | coolant storage container is moved using an actuator and the position of a to-be-cooled body is adjusted by extending | stretching an elastic body. The vacuum heat insulating device according to the present invention adjusts the position of the cooled object by controlling the actuator so that the performance of the cooled object accommodated in the vacuum insulated container is exhibited.

  ADVANTAGE OF THE INVENTION According to this invention, the position adjustment of the to-be-cooled body in a vacuum vessel can be performed easily.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
<< First Embodiment-Vacuum Insulation Container >>
FIG. 1 is a schematic sectional view of a vacuum heat insulating container according to the first embodiment of the present invention. The vacuum heat insulating container 10A generally includes a refrigerant storage container (hereinafter referred to as “storage container”) 11 for storing a predetermined refrigerant 20, a vacuum container 12 for maintaining a space around the storage container 11 in a vacuum, and a storage container. 11 and a refrigerant supply pipe 25 for supplying the refrigerant 20 to the apparatus 11. A body to be cooled 14 is attached to the outside of the bottom surface of the storage container 11, and the body 14 to be cooled is opposed to the bottom plate 22 of the vacuum container 12 with the heat insulating material 13 interposed therebetween. The vacuum heat insulating container 10 </ b> A has a structure capable of adjusting the position (height) of the storage container 11 and the body 14 to be cooled by the position adjusting mechanism 17. Hereinafter, the structure of the vacuum heat insulating container 10A will be described in detail.

[Storage container 11 and refrigerant 20]
As the constituent material of the storage container 11, stainless steel (SUS), copper (Cu), aluminum (Al), fiber reinforced plastics (FRP), or the like is used. As the refrigerant 20 stored in the storage container 11, a liquid refrigerant such as helium (He), neon (Ne), nitrogen (N ₂ ), argon (Ar), xenon (Xe), or the like is used. The storage container 11 that stores the refrigerant 20 is a cooling unit that cools the cooled object 14, and the cooled object 14 has a temperature equal to or lower than the boiling point of the refrigerant 20 due to heat conduction from the refrigerant 20 through the storage container 11. To be cooled. From the viewpoint of increasing the cooling efficiency of the body to be cooled 14, the portion (the bottom surface of the storage container 11) to which the body 14 is attached in the storage container 11 is preferably made of a material having excellent thermal conductivity.

  Note that the storage container 11 is cooled to a cryogenic temperature by the stored refrigerant 20 and thus changes from a shape at normal temperature to a contracted shape depending on the thermal expansion coefficient of the material constituting the storage container 11. Although the object to be cooled 14 moves with the thermal contraction of the storage container 11, the position of the object to be cooled 14 is adjusted by the position adjusting mechanism 17 as will be described later.

[Cooled object 14]
The body to be cooled 14 is a superconducting bulk magnet, SQUID, superconducting coil, or the like, and exhibits its function well below the boiling point of the refrigerant 20. When the body 14 to be cooled is a SQUID, if an eddy current is generated in the storage container 11, a large error occurs in the measurement value. Non-magnetic and non-metallic materials are used. The inspection object 30 that gives magnetism to the object to be cooled 14 or receives magnetism from the object to be cooled 14 is arranged outside the vacuum vessel 12.

[Refrigerant supply pipe 25]
The refrigerant 20 can be supplied to the storage container 11 from the outside to the storage container 11 through the refrigerant supply pipe 25 disposed through the vacuum container 12. The refrigerant supply pipe 25 also plays a role of releasing gas resulting from the evaporation of the refrigerant 20 generated inside the storage container 11 to the outside of the vacuum container 12. The refrigerant supply pipe 25 is preferably provided with an automatic refrigerant supply mechanism (not shown) that periodically supplies the refrigerant 20 to the storage container 11, and a constant amount of refrigerant 20 is always stored in the storage container 11. Thereby, the temperature rise of the to-be-cooled body 14 can be suppressed.

  The refrigerant supply pipe 25 has an extendable part 26 in a part of the vacuum container 12. The expansion / contraction part 26 is a part that expands and contracts following the amount of movement of the storage container 11 when the position adjusting mechanism 17 is driven to adjust the positions of the storage container 11 and the cooled object 14 within the vacuum container 12. Yes, so that the movement of the storage container 11 and the cooled object 14 is not hindered. The refrigerant supply pipe 25 is made of stainless steel (SUS) or the like.

[Vacuum container 12]
The vacuum container 12 includes a body portion 23, an upper lid 21 that closes the upper surface of the body portion 23, and a bottom plate 22 that closes the lower surface of the body portion 23. The upper lid 21 serves as a fixed end fixed to a frame of an apparatus (for example, an MRI apparatus, an NMR apparatus, an electron beam generating apparatus, a SQUID apparatus, etc.) in which the vacuum heat insulating container 10A is used. A cylindrical projection wall 27 is provided on the back surface of the upper lid 21. The protruding wall 27 is for attaching an elastic body 15 to be described later. On the other hand, the bottom plate 22 is a free end. The vacuum vessel 12 is provided with piping and an open / close valve (not shown) for evacuating the vacuum vessel 12 and maintaining the vacuum.

  The vacuum vessel 12 is often made of stainless steel, but is not limited to this, and a constituent material can be appropriately selected depending on the use of the vacuum heat insulating vessel 10A. For example, when the body 14 to be cooled is a SQUID, the vacuum container 12 is made of a nonmagnetic / nonmetallic material such as glass fiber reinforced plastic for the same reason as the storage container 11.

[Insulation material 13]
A heat insulating material 13 is disposed in a space between the body to be cooled 14 and the bottom plate 22 of the vacuum vessel 12. Further, a heat insulating material 13 is also disposed in a space between the storage container 11 and the body portion 23 of the vacuum container 12. These heat insulating materials 13 have a function of suppressing the radiant heat from being transmitted from the vacuum vessel 12 (the bottom plate 22 and the body portion 23) to the storage vessel 11 and preventing the refrigerant 20 stored in the storage vessel 11 from evaporating. Have. As the heat insulating material 13, a laminated heat insulating material in which films deposited with Al and heat insulating spacers are alternately stacked is preferably used.

  It is known that the heat insulating performance of such a laminated heat insulating material is proportional to the number of laminated layers of the Al vapor deposition film and the heat insulating spacer, and the heat insulating performance increases as the number of laminated layers increases. On the other hand, the heat insulating performance of the laminated heat insulating material also depends on the stacking interval between the Al deposited film and the heat insulating spacer. The larger the stacking interval, the higher the heat insulating performance, and the shorter the stacking interval, the lower the heat insulating performance. Moreover, the storage container 11 and the to-be-cooled body 14 receive more heat quantity from the heat insulating material 13 in a state in contact with the heat insulating material 13 than in a state not in contact with the heat insulating material 13. Accordingly, the size of the space formed between the storage container 11 and the cooled object 14 and the vacuum container 12 and the thickness of the heat insulating material 13 disposed in this space are determined by the vacuum applied to the storage container 11 and the cooled object 14. It is determined appropriately so that the radiant heat from the container 12 is reduced.

[Position adjustment mechanism 17]
The position adjustment mechanism 17 includes an elastic body 15 having elasticity and an actuator 16 provided with an expansion / contraction drive unit 18. One end of the elastic body 15 in the expansion / contraction direction is attached to a protruding wall 27 provided on the upper lid 21 of the vacuum container 12. A heat insulating member 28 is disposed on the upper surface of the storage container 11, and the other end of the elastic body 15 in the expansion / contraction direction is attached to the heat insulating member 28. Thus, the storage container 11 is supported (fished) with respect to the vacuum container 12.

  As the elastic body 15, the weight of the storage container 11 itself to be supported and the weight of the cooled object 14, the weight of the refrigerant 20 stored in the storage container 11, and the like are taken into account, and the position of the cooled object 14 is adjusted. In consideration of the amount, those having the required mechanical strength and elastic performance are appropriately selected. For example, a coil spring, a molded bellows, an elastic resin, or the like can be used. The weight of the refrigerant 20 can be calculated from the density of the refrigerant 20 and the volume of the storage container 11. At this time, the weight calculated using the density in the solid state may be used as the density of the refrigerant 20.

  In the vacuum heat insulating container 10 </ b> A, a form using a molded bellows as the elastic body 15 is shown. When a cylindrical body such as a molded bellows is used and there is a differential pressure between the inside and the outside, the molded bellows may be deformed and desired stretchability may not be obtained. Therefore, a hole 29 is provided in the protruding wall 27 so that the inside and outside of the cylindrical body are held in the same vacuum atmosphere.

  By disposing the heat insulating member 28, the elastic body 15 can be held near the normal temperature and the stretchability (elasticity) can be satisfactorily exhibited, and the vacuum vessel 12 can be provided via the protruding wall 27 and the elastic body 15. By suppressing heat from being transmitted from the upper lid 21 to the storage container 11, evaporation of the refrigerant 20 can be suppressed. The cross-sectional area and length of the heat insulating member 28 are set so that the elastic body 15 is maintained near the normal temperature. Since the heat insulating member 28 is also required to have mechanical characteristics for supporting the storage container 11 and the object 14 to be cooled, the heat insulating member 28 is made of, for example, glass fiber reinforced plastic having a low thermal conductivity. The

  In addition, when the elastic body 15 has heat insulation, the stretchability of the part hold | maintained at normal temperature in the elastic body 15 can be utilized. Therefore, in this case, the elastic body 15 may be directly attached to the upper surface of the storage container 11 without arranging the heat insulating member 28.

  The actuator 16 is attached to the upper lid 21 of the vacuum container 12, and the telescopic drive unit 18 pushes the storage container 11 toward the bottom plate 22 side of the vacuum container 12. FIG. 1 shows a state in which the heat insulating member 28 is pushed down by the pressure applied by the telescopic drive unit 18 and the elastic body 15 is extended. The distal end of the extension / contraction drive unit 18 and the heat insulating member 28 are not fixed. Therefore, when the expansion / contraction drive unit 18 is lifted from the state shown in FIG. 1 and the tip of the expansion / contraction drive unit 18 is separated from the heat insulating member 28, the elastic body 15 will remove them according to the weight of the storage container 11 and the body 14 to be cooled. It is the length to stably support fishing. Thus, in the vacuum heat insulating container 10A, the elastic body 15 can be forcibly extended using the actuator 16 but cannot be contracted.

  Since the storage container 11 is placed in a vacuum atmosphere, a pressure difference between the atmospheric pressure and the vacuum is generated in an area having an area determined by the diameter of the refrigerant supply pipe 25 in the storage container 11. For example, when a φ6.35 mm pipe is used for the refrigerant supply pipe 25, a force of about 3 N (about 0.3 kgf) acts on this portion. The specification of the actuator 16 should be determined so that the position adjustment of the storage container 11 is not hindered by this force, and the force and displacement required to move the storage container 11 and the cooled object 14 are taken into consideration. That's fine.

[Usage form of vacuum insulation container 10A]
Since the assembly of the vacuum heat insulating container 10A configured as described above is performed at room temperature in a state where the refrigerant 20 is not stored in the storage container 11, the vacuum of the body 14 to be cooled when the vacuum heat insulating container 10A is assembled. The position in the container 12 is, for example, in a state where the actuator 16 does not push the storage container 11 toward the bottom plate 22 side of the vacuum container 12, and the lower surface of the cooled object 14 is below the cooled object 14 (the vacuum container 12. It can be set as the position which is not in contact with the heat insulating material 13 arrange | positioned on the upper side of the baseplate 22. For example, when the vacuum heat insulating container 10A is not used, the cooled object 14 is held at a position away from the bottom plate 22 so that heat is not easily transmitted from the bottom plate 22 side to the cooled object 14, and when the vacuum heat insulating container 10A is used. The object to be cooled 30 can be held close to the bottom plate 22 side so as to obtain the characteristics required for the object to be cooled 14 with respect to the inspection object 30. What is necessary is just to determine the specification of the elastic body 15 so that such a state may be implement | achieved.

  When the refrigerant 20 is actually stored in the storage container 11 after the vacuum heat insulating container 10A is assembled, the storage container 11 contracts. As described above, the storage container 11 is supported by the upper lid 21, which is the fixed end of the vacuum container 12, via the protruding wall 27, the elastic body 15, and the heat insulating member 28. The upper surface becomes a fixed end, the bottom surface becomes a free end, and the bottom surface moves to the upper surface side. As a result, the object to be cooled 14 attached to the outside of the bottom surface of the storage container 11 is separated from the bottom plate 22 of the vacuum container 12. That is, the cooled object 14 is separated from the inspection object 30.

  Therefore, the actuator 16 is driven to push the storage container 11 and the cooled object 14 together toward the bottom plate 22 side of the vacuum container 12. The drive of the actuator 16 is positioned at a position that exhibits good detection sensitivity and accuracy with respect to the magnetism that the cooled object 14 receives from the inspection object 30 or that can give sufficient magnetic force to the inspection object 30. As controlled. For example, when the object to be cooled 14 is a SQUID, a magnetic field having a known strength is generated in the inspection object 30, the magnetism is detected by the SQUID, and the value detected by the SQUID is within a desired detection accuracy range. It can be done so that Further, simply, the contraction length of the storage container 11 is obtained from the shape of the storage container 11, the thermal expansion coefficient of the material constituting the storage container 11, the normal temperature and the cooling temperature by the refrigerant 20, and the contraction length thereof. The storage container 11 and the object to be cooled 14 may be integrally pushed toward the bottom plate 22 side of the vacuum container 12 and held.

  After the use of the vacuum heat insulating container 10A is finished, the actuator 16 is driven so that the expansion / contraction driving unit 18 is separated from the heat insulating member 28, the elastic body 15 is contracted, and the storage container 11 and the cooled object 14 are pulled up. The amount of heat transferred from the bottom plate 22 side of the vacuum vessel 12 to the cooled object 14 can be kept small. As described above, in the vacuum heat insulating container 10A, the distance between the body 14 to be cooled attached to the outer side of the bottom surface of the storage container 11 and the bottom plate 22 can be appropriately and easily determined according to the use state of the vacuum heat insulating container 10A and the like. Can be adjusted arbitrarily.

<< Second Embodiment-Vacuum Insulation Container >>
FIG. 2 shows a schematic cross-sectional view of a vacuum heat insulating container according to the second embodiment of the present invention. In the vacuum heat insulating container 10A (see FIG. 1), the object to be cooled 14 is disposed outside the bottom surface of the storage container 11. However, in the vacuum heat insulating container 10B according to the second embodiment, the object to be cooled 14 is the storage container 11. This is different from the vacuum heat insulating container 10A only in this point. Therefore, the description of the components common to the vacuum heat insulating container 10A in the vacuum heat insulating container 10B will be omitted here.

  By accommodating the body 14 to be cooled inside the storage container 11, the space between the body 14 to be cooled and the bottom plate 22 of the vacuum container 12 is greater than that of the vacuum insulation container 10 </ b> A according to the first embodiment. Although it is widened by the thickness of the bottom surface, the object to be cooled 14 is directly cooled by the refrigerant 20 stored in the storage container 11, so that the cooling efficiency of the object to be cooled 14 increases, and the radiant heat from the vacuum container 12 is increased. Since it is consumed by the evaporation of the refrigerant 20 through the storage container 11, the temperature of the cooled object 14 is difficult to rise. Thus, the characteristics of the cooled object 14 are improved.

  Moreover, in the vacuum heat insulating container 10B, since the cooled object 14 is accommodated in the storage container 11, damage to the cooled object 14 due to external force or the like is prevented.

<< Third Embodiment-Vacuum Insulation Container >>
FIG. 3 shows a schematic cross-sectional view of a vacuum heat insulating container according to the third embodiment of the present invention. In the vacuum heat insulating container 10A (see FIG. 1), the storage container 11 storing the liquid refrigerant 20 is held at an extremely low temperature by using the heat insulating effect of the vacuum container 12, but according to the third embodiment. The vacuum heat insulating container 10C includes a cooling mechanism for forcibly cooling the refrigerant 20 stored in the storage container 11, and is different from the vacuum heat insulating container 10A in this respect. Here, the description of the components that are common to the vacuum heat insulating container 10A in the vacuum heat insulating container 10C and that have no difference in function will be omitted, and the cooling mechanism provided in the vacuum heat insulating container 10C will be described below. The configuration and operation of the will be described in detail.

[Cooling mechanism]
The cooling mechanism includes a refrigerator 31 that generates cold heat, and a heat conductive member 32 that conducts the cold heat from the refrigerator 31 to the storage container 11. The refrigerator 31 is attached to the upper surface of the upper lid 21 of the vacuum container 12. As the refrigerator 31, various cryogenic refrigerators such as a Stirling type refrigerator, a pulse tube type refrigerator, a Gifford-McMahon type refrigerator, and the like can be used. What is necessary is just to consider the freezing point, boiling point, etc. of the refrigerant | coolant 20 to perform.

  The heat conducting member 32 is connected to the first heat conducting plate 33 connected to the refrigerator 31, the stretchable heat conductor 34 connected to the first heat conducting plate 33, and the stretchable heat conductor 34. A second heat conduction plate 35 fixed to the upper surface of the storage container 11; a heat conduction rod 36 having one end connected to the second heat conduction plate 35 and the other end inserted into the refrigerant 20 stored in the storage container 11; These are all made of a metal having excellent thermal conductivity, for example, aluminum (Al) or copper (Cu).

  The elastic heat conductor 34 expands and contracts so that the movement of the storage container 11 and the body 14 to be cooled by the position adjusting mechanism 17 is not hindered. For example, a pure aluminum (Al) stranded wire is preferably used. This is because the pure Al stranded wire has flexibility, so that it quickly follows the change in the distance between the storage container 11 and the refrigerator 31 (first heat conduction plate 33) when the storage container 11 is raised and lowered. This is because the temperature difference generated between the refrigerator 31 and the storage container 11 can be reduced because the thermal conductivity is high.

  The cold generated in the refrigerator 31 is transmitted to the second heat conduction plate 35 via the first heat conduction plate 33 and the stretchable heat conductor 34, and the second heat conduction plate 35 cools the storage container 11. At the same time, the heat conduction rod 36 is cooled, and the heat conduction rod 36 directly cools the refrigerant 20. Thus, the refrigerant 20 can be cooled and held at a predetermined temperature not lower than the freezing point and lower than the boiling point (that is, a temperature at which the refrigerant 20 hardly evaporates), or the refrigerant 20 can be solidified.

  The object to be cooled 14 attached to the storage container 11 is cooled by the refrigerant 20 thus held at an extremely low temperature, so that, for example, when the object to be cooled 14 is a superconducting bulk magnet, the critical current value is improved. And the performance is stabilized. Further, when the cooled object 14 is a SQUID, the thermal noise is reduced as the operating temperature is lowered, so that the sensitivity is improved. Further, when the refrigerant 20 is cooled and solidified below its freezing point, the temperature of the object to be cooled 14 rises using the heat of fusion of the solidified refrigerant 20 even if the operation of the refrigerator 31 is stopped. Can be suppressed.

[Control of refrigerator 31 and actuator 16]
When the refrigerator 31 is used, when the refrigerator 31 is stopped due to a power failure or the like, heat (heat that is higher than the temperature of the refrigerant 20) is transmitted from the refrigerator 31 to the storage container 11 through the heat conducting member 32. This heat raises the temperature of the storage container 11 and causes the refrigerant 20 stored in the storage container 11 to melt or evaporate. When the temperature of the storage container 11 rises, the storage container 11 expands according to the coefficient of thermal expansion of its constituent materials. Therefore, if the driving state of the actuator 16 is maintained, the object to be cooled 14 is transmitted from the heat insulating material 13 to the object to be cooled 14 by contacting the heat insulating material 13 disposed on the bottom plate 22 of the vacuum vessel 12. There is a risk that the heat increases and the temperature rise of the cooled object 14 and the storage container 11 is accelerated. Moreover, if the to-be-cooled body 14 compresses the heat insulating material 13 strongly, there exists a possibility that the to-be-cooled body 14 may be damaged by the force.

  In order to prevent this, it is preferable to use the actuator 16 that loses the pressing force that pushes the storage container 11 downward during a power failure. Thereby, the storage container 11 moves to the upper lid 21 side of the vacuum container 12 due to the stretchability (elastic force) of the elastic body 15, and the cooled object 14 moves away from the bottom plate 22 side of the vacuum container 12. Thus, if the body 14 to be cooled is separated from the bottom plate 22 side, heat is hardly transmitted from the bottom plate 22 side to the body 14 to be cooled, and the temperature rise of the body 14 to be cooled is suppressed. Moreover, since the to-be-cooled body 14 is not strongly pressed against the heat insulating material 13 even if the storage container 11 is thermally expanded, damage to the to-be-cooled body 14 can be prevented.

  As the actuator 16 that loses the applied pressure at the time of a power failure, for example, an actuator using a conductive polymer used for artificial muscles and the like can be mentioned. Since such a conductive polymer has a property of extending when electricity is applied, the direction of expansion when energized may be used so as to coincide with the expansion / contraction direction of the elastic body 15. The actuator 16 can also be a pneumatic actuator having a structure that automatically opens the valve in the event of a power failure to release the applied pressure.

  As the actuator 16, one that generates a pressure force that is turned on to push down the storage container 11 only when the position of the cooled object 14 is adjusted and needs to be held at the adjusted position is preferably used. . In the case of adjusting the position of the body to be cooled 14, specifically, the body 14 to be cooled, which is separated from the bottom plate 22 of the vacuum container 12 with the thermal contraction by the refrigerant 20 of the storage container 11, is brought close to the bottom plate 22, When it is necessary to ensure the performance of the cooled object 14 with respect to the inspection object 30, or when the performance of the cooled object 14 with respect to the inspection object 30 is improved by forcibly bringing the cooled object 14 close to the bottom plate 22. Can be mentioned. When the vacuum heat insulating container 10C is not used, the object to be cooled 14 can be moved away from the bottom plate 22 side, so that the transfer of heat from the bottom plate 22 side to the object to be cooled 14 can be suppressed.

  In the vacuum heat insulating container 10C as well, the position adjustment mechanism 17 moves the storage container 11 by using the position adjusting mechanism 17 in the same manner as the vacuum heat insulating container 10A so that the space between the cooled object 14 and the bottom plate 22 of the vacuum container 12 is changed. It can be easily adjusted as appropriate according to the above. Thereby, the to-be-cooled body 14 can be changed to the state where the performance requested | required rapidly is exhibited. Further, when the refrigerator 31 becomes unusable due to a power failure or the like, the power of the actuator 16 is also turned off, so that it is difficult for heat to be transmitted from the bottom plate 22 side to the storage container 11 and the cooled object 14. 11 can be maintained at a very low temperature for a long time. Furthermore, the cooled object 14 is not pressed against the heat insulating material 13 disposed on the bottom plate 22.

<< 4th Embodiment-Vacuum insulation container >>
FIG. 4 shows a schematic cross-sectional view of a vacuum heat insulating container according to the fourth embodiment of the present invention. The vacuum heat insulating container 10D according to the fourth embodiment includes a cooling mechanism (the refrigerator 31, heat conduction) provided in the vacuum heat insulating container 10C according to the third embodiment described above, in the vacuum heat insulating container 10B according to the second embodiment described above. The member 32) is added.

  Therefore, the vacuum heat insulating container 10D has both the characteristics of the vacuum heat insulating container 10B and the vacuum heat insulating container 10C. For example, the object to be cooled 14 can be cooled below the freezing point of the refrigerant, and the cooling efficiency at that time Is high, and the cooled object 14 can be maintained at high performance. In addition, the vacuum heat insulating container 10D simply and appropriately adjusts the distance between the storage container 11 housing the object to be cooled 14 and the bottom plate 22 of the vacuum container 12 according to the usage state of the vacuum heat insulating container 10D. It has the feature that it can be. Since the description about each component of the vacuum heat insulation container 10D overlaps with the above description, it is omitted here.

<< Fifth Embodiment-Vacuum Insulation Container >>
FIG. 5 shows a schematic cross-sectional view of a vacuum heat insulating container according to the fifth embodiment of the present invention. Although the vacuum heat insulating containers 10A to 10D according to the first to fourth embodiments described above cool the cooled object 14 using the refrigerant 20, the vacuum heat insulating container 10E according to the fifth embodiment is a refrigerator. 31 has a structure for directly cooling the object 14 to be cooled. Therefore, the vacuum heat insulating container 10E does not include the storage container 11 and the refrigerant supply pipe 25, and the heat conducting member 32 does not include the heat conducting rod 36.

  The body to be cooled 14 is supported by the upper lid 21 of the vacuum vessel 12 via the projection wall 27, the elastic body 15, and the heat insulating member 28, and the actuator 16 holds the body 14 to be cooled via the heat insulating member 28. 12 can be pushed out to the bottom plate 22 side. The cold heat from the refrigerator 31 is thermally conducted to the body to be cooled 14 via the first heat conductive plate 33, the stretchable heat conductor 34 and the second heat conductive plate 35, thereby cooling the body 14 to be cooled.

  The vacuum heat insulating container 10E has a compact structure because it does not use a refrigerant. Further, since the storage container for storing the refrigerant is not used, the actuator 16 does not require a displacement for compensating for the heat shrinkage of the storage container. Therefore, there is an advantage that a small actuator with a short extension amount (displacement amount) can be used as the actuator 16.

<< 6th Embodiment-Vacuum heat insulation apparatus >>
The schematic block diagram of the vacuum heat insulation apparatus which concerns on FIG. 6 at 6th Embodiment is shown. This vacuum heat insulating device 100A includes the vacuum heat insulating container 10C shown in FIG. Here, it is assumed that the object to be cooled 14 included in the vacuum heat insulating container 10C generates a certain amount of magnetism (magnetic field). For example, the cooled object 14 is a superconducting bulk magnet that generates a magnetic field.

  The vacuum heat insulating device 100A includes a control system for optimizing the position of the object to be cooled 14 included in the vacuum heat insulating container 10C. The control system includes an actuator controller 101 that performs drive control of the actuator 16, and Based on the temperature sensor head 40 for measuring the temperature of the first heat conduction plate 33 [a part of the heat conduction member 32 (see FIG. 3)] and the physical quantity (for example, voltage) generated in the temperature sensor head 40 1 is provided with a measuring device 105 for calculating the temperature of the heat conduction plate 33. The temperature sensor head 40 and the measuring device 105 constitute a temperature sensor.

  The control system of the vacuum heat insulating device 100A includes a detection head 103 that detects the magnetism generated by the cooled object 14 and the strength of the magnetism detected by the detection head 103 from the physical quantity (for example, current) generated by the detection head 103. And a measuring instrument 104 for calculating the thickness. The detection head 103 and the measuring instrument 104 constitute a magnetic measuring instrument. The control system of the vacuum heat insulating device 100A further drives the actuator 16 so that the position of the cooled object 14 is adjusted based on the magnetic strength obtained by the measuring instrument 104 and the temperature obtained by the measuring instrument 105. A personal computer 102 that functions as a control unit that transmits a signal for performing control to the actuator controller 101 is provided.

  The applied pressure generated by the actuator 16 (force for pushing the storage container 11 toward the bottom plate 22 of the vacuum container 12) and the displacement amount of the actuator 16 (length or displacement amount of the expansion / contraction drive unit 18) are determined by the actuator controller 101. The personal computer 102 constantly monitors the state of the actuator 16.

  The temperature sensor head 40 is, for example, a thermoelectric conversion element. The measuring device 105 calculates the temperature according to the voltage generated by the temperature sensor head 40, and the temperature data is recorded in the personal computer 102. As shown in FIG. 6, the temperature sensor head 40 is attached to the first heat conducting plate 33. This is because the change in the load on the refrigerator 31 caused by the temperature change of the body to be cooled 14 appears remarkably at the temperature of the first heat conduction plate 33 closest to the refrigerator 31.

  The magnetism generated by the cooled object 14 is detected by the detection head 103, and the detected magnetic strength is recorded in the personal computer 102 via the measuring device 104. When the object to be cooled 14 is a superconducting bulk magnet, a coil can be used as the detection head 103, and a change in the strength of the magnetism (magnetic field) appears as the magnitude of the current generated in the coil. 6 shows a form in which the detection head 103 is attached to the lower surface (atmosphere side) of the bottom plate 22 of the vacuum vessel 12, the detection head 103 may be separated from the bottom plate 22 by a certain distance. .

  In the vacuum heat insulating device 100A configured as described above, when the actuator 16 is driven to change the position of the cooled object 14, the magnetic strength detected by the detection head 103 changes. By utilizing this, the optimum positioning of the cooled object 14 is performed. When the actuator 16 is driven, the magnetic strength obtained through the measuring instrument 104 is a desired setting value that is input to the personal computer 102 in advance (this setting value can be arbitrarily changed as appropriate). As described above, a control signal for driving and controlling the actuator 16 is generated by the personal computer 102, and this control signal is transmitted to the actuator controller 101 to feedback control the driving of the actuator 16. Thus, after the optimum position of the cooled object 14 is determined, the state of the actuator 16 is maintained, and the cooled object 14 is held at that position.

  In such feedback control of the actuator 16, the drive of the actuator 16 is monitored so that the temperature measured by the temperature sensor (temperature sensor head 40 + measuring device 105) is maintained within a predetermined range. In the vacuum heat insulating container 10C, as described above, the closer the object to be cooled 14 is to the bottom plate 22 side of the vacuum container 12, the more easily the temperature of the object to be cooled 14 is increased by the heat transmitted from the bottom plate 22 side. Appears as a load on driving. Therefore, when the temperature measured by the temperature sensor is predicted to be out of the predetermined range, it is preferable to feed-forward control the driving of the actuator 16 so as to reverse the expansion / contraction of the expansion / contraction driving unit 18. Moreover, if the to-be-cooled body 14 compresses the heat insulating material 13 disposed on the bottom plate 22, radiant heat is suddenly transmitted to the to-be-cooled body 14, and this appears as a sudden load on the operation of the refrigerator 31. When such a sudden load is observed, for example, the drive power supply of the actuator 16 is turned off, and the vacuum heat insulating container 10C is returned to the initial state (the state in which the expansion / contraction drive unit 18 is not extended). Is also preferable.

  In the vacuum heat insulating device 100 </ b> A, in the process of optimizing the position of the cooled object 14, the position of the cooled object 14, the operating load of the refrigerator 31 (the temperature of the first heat conduction plate 33), Data indicating the relationship with the length (displacement amount) is obtained, and the data is stored in the personal computer 102. For this reason, once the optimum positioning of the cooled object 14 is performed, the driven object 14 is controlled at the desired position by controlling the driving of the actuator 16 based on the data stored in the personal computer 102. can do.

<< 7th Embodiment-Vacuum heat insulation apparatus >>
FIG. 7 shows a schematic configuration diagram of a vacuum heat insulating device according to the seventh embodiment. This vacuum heat insulating device 100B includes the vacuum heat insulating container 10C shown in FIG. Here, the to-be-cooled body 14 included in the vacuum heat insulating container 10C is, for example, a magnetic sensor that detects magnetism, and is, for example, a SQUID.

  The vacuum heat insulating device 100B includes a control system for optimizing the position of the cooled object 14 included in the vacuum heat insulating container 10C. The control system includes an actuator controller 101, a personal computer 102, a temperature sensor (temperature The sensor head 40 and the measuring instrument 105) are provided, which are equivalent to those provided in the vacuum heat insulating device 100A. The strength of the magnetism detected by the cooled object 14 is digitized by the measuring instrument 111 and sent to the personal computer 102 where it is stored. The control system of the vacuum heat insulating device 100B also includes a signal source 112 that generates a magnetic signal having a strength that can be measured by the cooled object 14 and a signal source controller 113 that controls the magnetic signal generated by the signal source 112. ing.

  The vacuum heat insulating device 100B having such a configuration utilizes the fact that when the actuator 16 is driven to change the position of the cooled object 14, the magnetic strength that the cooled object 14 receives from the signal source 112 changes. Thus, the optimum positioning of the cooled object 14 is performed. Specifically, when the actuator 16 is driven, the signal source 112 generates a magnetic signal having a certain strength. A control signal for driving and controlling the actuator 16 is generated by the personal computer 102 so that the strength of the magnetism measured by the cooled object 14 becomes a desired set value input to the personal computer 102 in advance. A signal is transmitted to the actuator controller 101, and the drive of the actuator 16 is feedback-controlled. Thus, after the optimum position of the cooled object 14 is determined, the state of the actuator 16 is maintained, and the cooled object 14 is held at that position. The method of using the temperature sensor and the resetting method after the optimum positioning of the object to be cooled 14 are the same as in the case of the vacuum heat insulating device 100A, and thus the description thereof is omitted here.

<< Eighth Embodiment-Vacuum Thermal Insulation Apparatus >>
The schematic block diagram of the vacuum heat insulation apparatus which concerns on FIG. 8 at 8th Embodiment is shown. This vacuum heat insulating device 100C includes the vacuum heat insulating container 10B shown in FIG. Here, it is assumed that the object to be cooled 14 included in the vacuum heat insulating container 10B generates magnetism (magnetic field) having a certain strength. For example, the cooled object 14 is a superconducting bulk magnet that generates a magnetic field.

  The vacuum heat insulating device 100C includes a control system for optimizing the position of the object to be cooled 14 included in the vacuum heat insulating container 10B. The control system includes an actuator controller 101, a personal computer 102, a magnetic measuring instrument ( A detection head 103 and a measuring instrument 104) are provided, which are equivalent to those provided in the vacuum heat insulating device 100A.

  The control system of the vacuum heat insulating device 100 </ b> C also includes a flow sensor that measures the evaporative gas flow rate of the refrigerant 20 discharged through the refrigerant supply pipe 25, and the flow sensor includes a flow meter (mass flow meter) 121 and a flow rate. And a measuring instrument 122 for reading the flow rate of the evaporative gas detected by the meter 121. The flow meter 121 and the measuring instrument 122 may be integrated.

  In the vacuum storage container 10B, since the storage container 11 is maintained near the boiling point of the refrigerant 20, when the amount of heat such as radiant heat from the vacuum container 12 is transmitted to the refrigerant 20, the refrigerant 20 evaporates and evaporated gas is supplied to the refrigerant. It is discharged outside through the tube 25. Since the amount of evaporative gas depends on the object to be cooled 14 stored in the storage container 11 and the amount of heat transmitted to the storage container 11, the distance between the bottom surface of the storage container 11 and the bottom plate 22 of the vacuum container 12 is changed. The flow rate of the evaporative gas discharged from the refrigerant supply pipe 25 changes. Therefore, the evaporative gas flow rate measured by the flow meter 121 is recorded in the personal computer 102 via the measuring device 122.

  The evaporative gas flow rate data measured by the flow rate sensor is used in place of the temperature data detected by the temperature sensor in the vacuum heat insulating device 100A. That is, in the vacuum heat insulating device 100C, as in the vacuum heat insulating device 100A, when the actuator 16 is driven, the magnetic strength obtained through the detection head 103 and the measuring instrument 104 is input to the personal computer 102 in advance. A control signal for driving and controlling the actuator 16 is generated by the personal computer 102 so as to obtain a desired set value, and this control signal is transmitted to the actuator controller 101 to feedback control the driving of the actuator 16. During feedback control of driving of the actuator 16, the driving of the actuator 16 is monitored so that the evaporative gas flow rate measured by the flow sensor (flow meter 121 + measuring device 122) is maintained within a predetermined range.

  When it is predicted that the evaporative gas flow rate measured by the flow rate sensor is likely to deviate from the predetermined range, it is preferable to feed-forward control the driving of the actuator 16 so as to reverse the expansion / contraction of the expansion / contraction driving unit 18. Further, when the object to be cooled 14 compresses the heat insulating material 13 disposed on the bottom plate 22 of the vacuum vessel 12, heat is easily transmitted to the object to be cooled 14 and the evaporative gas flow rate increases rapidly. In the case where a sudden increase in the temperature is observed, for example, it is preferable that the drive power source of the actuator 16 is turned off so that the vacuum heat insulating container 10B returns to the initial state.

  Even in the vacuum heat insulating device 100C, in the process of optimizing the position of the cooled object 14, data indicating the relationship between the position of the cooled object 14, the flow rate of the evaporating gas, and the length (displacement amount) of the expansion / contraction drive unit 18 is obtained. The data is obtained and stored in the personal computer 102. Therefore, once the optimum positioning of the cooled object 14 is performed, the driven object 14 is controlled at the desired position by controlling the driving of the actuator 16 based on the data stored in the personal computer 102. be able to.

<< Ninth Embodiment-Vacuum Thermal Insulation Apparatus >>
FIG. 9 shows a schematic configuration diagram of a vacuum heat insulating device according to the ninth embodiment. This vacuum heat insulating device 100D includes the vacuum heat insulating container 10A shown in FIG. Here, the to-be-cooled body 14 included in the vacuum heat insulating container 10A is, for example, a magnetic sensor that detects magnetism, and is, for example, a SQUID.

  The vacuum heat insulating device 100D includes a control system for optimizing the position of the object to be cooled 14 included in the vacuum heat insulating container 10A. The control system includes an actuator controller 101 and a personal computer 102. These are equivalent to those included in the vacuum heat insulating devices 100A to 100C. The control system of the vacuum heat insulating device 100C includes a flow sensor (a flow meter 121 and a measuring device 122) having a flow meter 121 and a measuring instrument 122, and the flow sensor includes the above-described vacuum heat insulating apparatus 100C. Is the same. The control system of the vacuum heat insulating device 100C includes a signal source 112 and a signal source controller 113, which are the same as those included in the vacuum heat insulating device 100B. Further, the difference between the vacuum heat insulating container 10A and the vacuum heat insulating container 10B is only a difference in whether the body 14 to be cooled is disposed outside or inside the storage container 11.

  In the vacuum heat insulating device 100D, when the actuator 16 is driven, the signal source 112 generates a magnetic signal having a certain strength. A control signal for driving and controlling the actuator 16 is generated by the personal computer 102 so that the strength of the magnetism measured by the cooled object 14 becomes a desired set value input to the personal computer 102 in advance. A signal is transmitted to the actuator controller 101, and the actuator 16 is feedback-controlled. Thus, after the optimum position of the cooled object 14 is determined, the state of the actuator 16 is maintained. In such feedback control of driving of the actuator 16, the driving of the actuator 16 is monitored so that the evaporative gas flow rate detected by the flow sensor is maintained within a predetermined range. The method for controlling the actuator when the evaporative gas flow rate suddenly increases and the method for resetting after the optimum positioning of the object to be cooled 14 are the same as in the case of the vacuum heat insulating device 100C. Is omitted.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to these embodiment. For example, each of the vacuum heat insulating containers 10A to 10E has a structure including one actuator 16, but is not limited thereto, and a plurality of actuators may be used. In that case, different types of actuators may be used. You may use. Moreover, in the vacuum heat insulating containers 10A to 10D, one elastic body 15 is configured to support the storage container 11 and the cooled object 14, but a plurality of elastic bodies connect the storage container 11 and the cooled object 14 to each other. It is good also as a structure which supports fishing. Although the vacuum heat insulating devices 100A and 100B include the vacuum heat insulating container 10C, they may include the vacuum heat insulating containers 10D and 10E instead of the vacuum heat insulating container 10C.

  In the vacuum heat insulating containers 10A to 10E, the heat insulating material 13 is disposed on the bottom plate 22 of the vacuum container 12. However, for example, when the object to be cooled 14 is to be used as close as possible to the bottom plate 22 (for example, if SQUID is higher, It is also possible to make a structure in which the heat insulating material 13 is not disposed on the bottom plate 22, assuming that it is used with sensitivity. Even in this case, by adopting the configuration of the vacuum heat insulating devices 100A to 100D, it is possible to prevent the object to be cooled 14 or the storage container 11 from being directly pressed against the bottom plate 22 and being damaged. .

It is a schematic sectional drawing of the vacuum heat insulation container which concerns on 1st Embodiment of this invention. It is a schematic sectional drawing of the vacuum heat insulation container which concerns on 2nd Embodiment of this invention. It is a schematic sectional drawing of the vacuum heat insulation container which concerns on 3rd Embodiment of this invention. It is a schematic sectional drawing of the vacuum heat insulation container which concerns on 4th Embodiment of this invention. It is a schematic sectional drawing of the vacuum heat insulation container which concerns on 5th Embodiment of this invention. It is a schematic block diagram of the vacuum heat insulation apparatus which concerns on 6th Embodiment of this invention. It is a schematic block diagram of the vacuum heat insulating apparatus which concerns on 7th Embodiment of this invention. It is a schematic block diagram of the vacuum heat insulation apparatus which concerns on 8th Embodiment of this invention. It is a schematic block diagram of the vacuum heat insulating apparatus which concerns on 9th Embodiment of this invention.

Explanation of symbols

10A, 10B, 10C, 10D, 10E Vacuum heat insulating container 11 Refrigerant storage container 12 Vacuum container 13 Heat insulating material 14 Cooled body 15 Elastic body 16 Actuator 17 Position adjustment mechanism 18 Telescopic drive part 21 Top cover 22 Bottom plate 23 Body part 25 Refrigerant supply pipe 26 Stretching part 27 Projection wall 28 Heat insulation member 29 Hole 30 Inspection object 31 Refrigerator 32 Heat conduction member 33 First heat conduction plate 34 Stretchable heat conductor 35 Second heat conduction plate 36 Heat conduction bar 40 Temperature sensor head 100A , 100B, 100C, 100D Vacuum heat insulating device 101 Actuator controller 102 Personal computer 103 Detection head 104, 105, 111, 122 Measuring instrument 112 Signal source 113 Signal source controller 121 Flow meter

Claims (10)

A refrigerant storage container for storing a predetermined refrigerant;
A cooled object attached to the refrigerant storage container and cooled by the refrigerant;
A vacuum container that accommodates the refrigerant storage container and the object to be cooled inside a vacuum, and
A position adjusting mechanism for adjusting the position of the object to be cooled by moving the refrigerant storage container, and a vacuum heat insulating container comprising:
The object to be cooled is opposed to one wall surface of the vacuum vessel at a predetermined interval,
The position adjusting mechanism is
One end of the expansion / contraction direction is attached to the vacuum container, the other end of the expansion / contraction direction is attached to the refrigerant storage container, and the refrigerant storage container and the cooled object are attached to the vacuum container. An elastic body that supports
A vacuum heat insulation container comprising: an actuator that adjusts a distance between the object to be cooled and the one wall surface by applying pressure to the refrigerant storage container to extend the elastic body.   The vacuum heat insulating container according to claim 1, wherein a heat insulating member that connects the elastic body and the refrigerant storage container is provided. A refrigerant supply pipe for supplying a refrigerant to the refrigerant storage container from the outside;
The vacuum heat insulating container according to claim 1, wherein the refrigerant supply pipe has an expansion / contraction portion that can expand and contract in a direction parallel to the expansion / contraction direction of the elastic body. . A cooling mechanism for cooling the refrigerant stored in the refrigerant storage container;
The cooling mechanism is
A refrigerator that generates predetermined cold heat;
A heat conduction member that conducts heat from the cold generated by the refrigerator to the refrigerant storage container, and
4. The heat conduction member according to claim 1, wherein the vacuum container includes a stretchable heat conductor that is stretchable in a direction parallel to a stretch direction of the elastic body. The vacuum insulation container according to item 1. A vacuum vessel in which the inside is kept in vacuum,
A body to be cooled housed inside the vacuum container so as to face one wall surface of the vacuum container at a predetermined interval;
A position adjusting mechanism for adjusting the position of the cooled object;
A vacuum insulation container comprising a cooling mechanism for cooling the object to be cooled,
The position adjusting mechanism is
An elastic body having elasticity and having one end in the expansion / contraction direction attached to the vacuum container and the other end attached to the object to be cooled, and supporting the object to be cooled with respect to the vacuum container;
An actuator that adjusts an interval between the cooled body and one wall surface of the vacuum vessel by applying pressure to the cooled body and extending the elastic body;
The cooling mechanism is
A refrigerator that generates predetermined cold heat;
A heat conduction member that conducts cold heat from the refrigerator to the object to be cooled, and
The vacuum heat insulating container, wherein the heat conducting member has a stretchable heat conductor that can be stretched in a direction parallel to a stretching direction of the elastic body.   The vacuum heat insulating container according to claim 5, wherein a heat insulating member that connects the elastic body and the refrigerant storage container is provided. The vacuum heat insulation container according to any one of claims 4 to 6, wherein the object to be cooled is a magnetism generator that generates magnetism of a certain strength,
An actuator controller for driving and controlling an actuator of a position adjusting mechanism provided in the vacuum heat insulating container;
A temperature sensor for measuring the temperature of the heat conducting member of the cooling mechanism provided in the vacuum heat insulating container;
A magnetometer for measuring magnetism generated by the magnetism generator; and
When the actuator is driven to position the magnetism generating device, the temperature detected by the temperature sensor is maintained within a predetermined range, and the strength of magnetism detected by the magnetometer is desired. And a control unit that transmits a control signal for driving and controlling the actuator to the actuator controller so as to have the strength of the vacuum heat insulating device. The vacuum heat insulation container according to any one of claims 4 to 6, wherein the object to be cooled is a magnetic insulation element,
An actuator controller for driving and controlling an actuator of a position adjusting mechanism provided in the vacuum heat insulating container;
A temperature sensor for measuring the temperature of the heat conducting member of the cooling mechanism provided in the vacuum heat insulating container;
A magnetic generator for generating magnetism of a strength that can be detected by the magnetic detection element;
A magnetic measuring instrument for determining the magnetic strength actually detected by the magnetic detection element with respect to the magnetism generated by the magnetic generator;
When the actuator is driven to position the magnetic detection element, the temperature detected by the temperature sensor is maintained within a predetermined range, and the magnetic strength required by the magnetic measuring instrument is desired. And a controller that transmits a control signal for driving and controlling the actuator to the actuator controller so as to be strong. The vacuum heat insulation container according to claim 3, wherein the object to be cooled is a magnetic generator that generates magnetism of a certain strength,
An actuator controller for driving and controlling an actuator of a position adjusting mechanism provided in the vacuum heat insulating container;
A flow rate sensor for detecting a flow rate of the refrigerant gas evaporating from the refrigerant storage container included in the vacuum heat insulating container;
A magnetometer for measuring magnetism generated by the magnetism generator; and
When the actuator is driven to position the magnetism generator, the flow rate of the refrigerant gas detected by the flow sensor is maintained within a predetermined range, and the strength of the magnetism detected by the magnetometer And a controller that transmits a control signal for driving and controlling the actuator to the actuator controller so that the actuator has a desired strength. The vacuum heat insulating container according to claim 3, wherein the object to be cooled is a magnetic detection element;
An actuator controller for driving and controlling an actuator of a position adjusting mechanism provided in the vacuum heat insulating container;
A flow rate sensor for detecting a flow rate of the refrigerant gas evaporating from the refrigerant storage container included in the vacuum heat insulating container;
A magnetic generator for generating magnetism of a strength that can be detected by the magnetic detection element;
A magnetic measuring instrument for determining the magnetic strength actually detected by the magnetic detection element with respect to the magnetism generated by the magnetic generator;
When the actuator is driven to position the magnetic detection element, the magnetic strength required by the magnetic measuring instrument is such that the refrigerant gas flow detected by the flow sensor is maintained within a predetermined range. And a controller that transmits a control signal for driving and controlling the actuator to the actuator controller so that the actuator has a desired strength.

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