JP6223846B2 - Cooling system - Google Patents

Description

  The present invention relates to a cooling device.

  As a refrigerator-cooled cryostat (cryogenic vacuum vessel), for example, an apparatus having a structure shown in FIG. 4 is known. In the cryostat 5 shown in FIG. 4, the first stage cooling cylinder C <b> 1 and the second stage cooling cylinder C <b> 2 of the GM refrigerator are inserted into the sleeve 7 that is isolated from the vacuum region in the vacuum vessel 100.

  Of the sleeves 7 including the first-stage sleeve 7a and the second-stage sleeve 7b, the first-stage cooling flange F1 heats the first-stage cold head H1 at the lower end of the first-stage sleeve 7a. In contact. The top plate portion of the heat shield container 106 in the vacuum container 100 is attached to the first stage cooling flange F1 so that heat can be transferred. Further, the object T to be cooled in the vacuum vessel 100 is placed on the second stage cooling flange F2 that is in thermal contact with the second stage cold head H2 provided at the tip of the second stage cooling cylinder C2 in the second stage sleeve 7b. The object T to be cooled is cooled by the heat transfer contact.

  Such a cryostat 5 may be used when various objects are evaluated by arranging the object to be cooled T in a magnetic field. In this case, a magnetic field generation unit that generates a magnetic field to be applied to the object to be cooled T may be disposed in the vicinity of the object to be cooled T. FIG. 4 shows an arrangement example in which an annular coil CL that generates a magnetic field around the object to be cooled T of the cryostat 5 is arranged around the object to be cooled T.

JP 2005-123313 A

  However, in the cryostat 5 shown in FIG. 4, since the cryostat 5 is taller than the magnetic field generation unit, a structure that stably supports the cryostat 5 is desired. Here, for example, a member for supporting the cryostat 5 may be newly provided. However, the number of processes or parts for stably attaching the cryostat increases, and workability may be reduced.

  The present invention has been made in view of the above, and an object thereof is to provide a cooling device that can be stably installed with a simpler structure.

  In order to achieve the above object, a cooling apparatus according to the present invention includes a refrigerator for cooling a sample, and a substantially columnar first that is thermally connected to a main part of the refrigerator and extends in one direction. A part of the heat transfer part and the main part of the first heat transfer part are thermally connected at one end, and the diameter thereof is smaller than that of the first heat transfer part and accommodates the sample. A cooling device including a cryostat configured to include a possible second heat transfer section, and a magnetic field generation section in which an opening for inserting the second heat transfer section is formed, The heat transfer portion has a flange portion protruding outward at one end portion, and the first heat transfer portion is fixed to each other by fixing the end surface on the one side of the first heat transfer portion and the flange portion. And a connecting portion that connects the second heat transfer portion and the connecting portion is placed on the magnetic field generating portion. Features.

  According to the cooling device described above, the cryostat is placed on the magnetic field generation unit in a state where the connection portion where the one end face of the first heat transfer unit and the flange portion of the second heat transfer unit are fixed to each other is in contact with the magnetic field generation unit. Placed on. Here, since the diameter of the first heat transfer section is larger than that of the second heat transfer section, the load generated by the refrigerator, the first heat transfer section, and the second heat transfer section is stabilized via the connecting section in the magnetic field generation section. Therefore, the cooling device including the cryostat can be stably installed. Moreover, the structure of the connection part of a 1st heat-transfer part and a 2nd heat-transfer part is only changed from the conventional structure, and stability of a cooling device can be improved with a simpler structure.

  Here, the flange portion may be formed such that the outer diameter thereof is substantially the same as the outer diameter of the first heat transfer portion.

  Thus, by increasing the outer diameter of the flange portion so that the outer diameter of the flange portion is substantially the same as the outer diameter of the first heat transfer portion, the stability of the cryostat placed on the magnetic field generating portion is improved. It can be further increased.

  Further, the connecting portion may be provided with an elastic member at a position in contact with the magnetic field generating portion.

  By providing the elastic member at a position in contact with the magnetic field generation unit, it is possible to alleviate the impact when placing the coupling unit on the magnetic field generation unit and further improve the stability of the cryostat.

  The one end surface of the first heat transfer portion is flat, and the flange portion and the one end surface of the first heat transfer portion are fastened on the outer peripheral side of the flange portion, and the end portion is a flange. The one end surface of the first heat transfer portion and the flange portion may be fixed to each other by a fastening member that does not protrude from the portion.

  The end surface on one side of the first heat transfer portion and the flange portion are fixed to each other by the fastening member, and the end portion of the fastening member has a shape that does not protrude from the flange portion, so that the first heat transfer is performed by the fastening member. It is possible to more securely fix the part and the second heat transfer part, and to stably place the cryostat without the fastening member coming into contact with the magnetic field generation part.

  Moreover, it can be set as the aspect further equipped with the control member for controlling the movement of the said 1st heat-transfer part to the direction different from said one direction.

  In this case, since movement in a direction different from one direction of the first heat transfer unit is restricted, the stability of the cryostat including the first heat transfer unit is further improved.

  ADVANTAGE OF THE INVENTION According to this invention, the cooling device which can be installed stably with a simpler structure is provided.

It is a schematic block diagram of the cooling device which concerns on embodiment. It is an enlarged view by the side of the 2nd heat-transfer part of a cryostat. It is a figure explaining the structure of the connection part of the 1st heat-transfer part of a cryostat, and a 2nd heat-transfer part. It is a schematic sectional drawing explaining the structure of the conventional cooling device.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a schematic configuration diagram of a cooling device 1 according to an embodiment of the present invention. FIG. 2 is an enlarged view of the cooling device 1 on the second heat transfer unit 20 side of the cryostat 2. FIG. 3 is a view for explaining the structure of the connecting portion between the first heat transfer section 10 and the second heat transfer section 20 of the cooling device 1.

  The cooling device 1 includes a refrigerator-cooled cryostat (cryogenic vacuum vessel) 2 and a magnetic field generator 80. The cryostat 2 includes a GM refrigerator 3, and a first heat transfer unit 10 and a second heat transfer unit 20 connected to the lower part of the GM refrigerator 3. The first heat transfer unit 10 and the second heat transfer unit 20 each have a cylindrical outer diameter, and the GM refrigerator 3, the first heat transfer unit 10, and the second heat transfer unit 20 are vertically aligned along the axis X. Are connected in this order. The 1st heat-transfer part 10 and the 2nd heat-transfer part 20 function also as a vacuum vessel which accommodates the sample S which is a to-be-cooled object.

  The GM refrigerator 3 is a refrigerator using a two-stage Gifford MacMahone (GM) cycle, which can be cooled to about 40K in the first stage, and is a radiation shield provided around the sample S. Used for cooling. The second stage can be cooled to about 4K and is used for cooling the sample S.

  In the cryostat 2 according to the present embodiment, the main part including the cold head of the first stage and the cold head of the second stage is accommodated in the main body 11 of the first heat transfer unit 10 and the sample S is subjected to the second heat transfer. The main body 21 of the unit 20 is accommodated. And the GM refrigerator 3 and the principal part of the 1st heat-transfer part 10 are thermally connected.

  The first heat transfer unit 10 and the second heat transfer unit 20 each have a substantially cylindrical shape. Moreover, the diameter of the main body part 11 of the first heat transfer unit 10 is larger than the diameter of the main body part 21 of the second heat transfer unit 20, and the main body of the second heat transfer unit 20 when viewed from the lower side in the axis X direction. The lower end surface 15 of the first heat transfer unit 10 protrudes outward with respect to the part 21. The second heat transfer part is configured to include a substantially cylindrical main body part 21 and a flange part 22 having a larger diameter than the main body part 21 formed at the upper end of the main body part 21. By fixing the flange portion 22 to the lower end surface 15, the first heat transfer portion 10 and the second heat transfer portion 20 are connected. The structure about the connection part which connects the 1st heat-transfer part 10 and the 2nd heat-transfer part 20 is mentioned later.

  In the cooling device 1, a magnetic field generation unit 80 that generates a magnetic field around the sample S is provided around the second heat transfer unit 20. The magnetic field generator 80 having an annular shape and having an opening 81 along the axis X includes, for example, an annular superconducting coil 82 that is enclosed in a vacuum vessel and arranged around the axis X. The diameter of the opening 81 is larger than the main body 21 of the second heat transfer unit 20 and smaller than the main body 11 of the first heat transfer unit 10.

  The magnetic field generator 80 can generate a strong magnetic field by passing a current through the superconducting coil 82 that has been cooled by a cooling means (not shown) to be in a superconducting state. In order to cool the sample S in a high magnetic field environment, the second heat transfer unit 20 is inserted into the opening 81 of the magnetic field generation unit 80. At this time, as shown in FIG. 1, the connecting portion 30 including the lower end surface 15 of the first heat transfer portion 10 and the flange portion 22 of the second heat transfer portion 20 is formed on the upper surface 84 of the magnetic field generation portion 80. It comes into contact. That is, the upper surface 84 of the magnetic field generation unit 80 becomes a mounting surface on which the cryostat 2 is mounted, and the buckling load in the vertical direction of the cryostat 2 is supported by the upper surface 84 of the magnetic field generation unit 80.

  Further, a flange portion 12 having a larger diameter than the main body portion 11 protruding outward from the main body portion 11 of the first heat transfer portion 10 is provided on the upper end side of the first heat transfer portion 10. As shown in FIG. 1, a regulating member 60 having an opening 61 corresponding to the main body 11 of the first heat transfer unit 10 and abutting against the flange 12 when the cryostat 2 is placed on the upper surface 84 of the magnetic field generator 80. Is provided separately from the magnetic field generator 80, whereby the horizontal movement of the cryostat 2 can be restricted.

  Next, the inside of the cryostat 2 will be described with reference to FIG. As described above, the main part including the cold head of the first stage and the cold head of the second stage of the GM refrigerator 3 is accommodated in the main body 11 of the first heat transfer unit 10. In the main body 21 of the second heat transfer unit 20, a rod-shaped cooling member 25 that is thermally connected to the cold head of the second stage to cool the sample S and energize the sample S is first. The sample S is accommodated in the second heat transfer unit 20 in a state where the sample S extends from the heat transfer unit 10 along the axis X and is suspended from the lower end 27 of the cooling member 25.

  A substantially cylindrical radiation shield 40 is provided around the sample S in the second heat transfer section 20. The radiation shield 40 is arranged on the lower end side of the second heat transfer unit 20 so as to cover the lower end side of the sample S. The radiation shield 40 is thermally connected to the cold head of the first stage in the first heat transfer section 10 and cooled to about 40K.

  Here, the connection part 30 between the 1st heat-transfer part 10 and the 2nd heat-transfer part 20 is demonstrated, referring FIG.2 and FIG.3. In the connection part 30, the flange part 22 of the second heat transfer part 20 is fixed to the lower end surface 15 of the first heat transfer part 10 by screws (fastening members) 37, and the flange part 22 is fixed to the first heat transfer part 10. The magnetic field generator 80 is placed on the upper surface 84 in a state of being connected to the lower end surface 15. At this time, the second heat transfer unit 20 is not supported by the magnetic field generation unit 80 or the like (see FIG. 1). Therefore, in other words, the second heat transfer unit in which the buckling load of the cryostat 2 including the first heat transfer unit 10 and the second heat transfer unit 20 is all connected to the lower end surface 15 and the lower end surface 15 of the first heat transfer unit 10. 20 flange portions 22 are applied.

  Here, since the diameter of the main body part 11 of the first heat transfer part 10 is sufficiently larger than the diameter of the main body part 21 of the second heat transfer part 20, the buckling load of the cryostat 2 can be increased on a wider surface. It is possible to reduce the overload per unit area. Moreover, the cryostat 2 long in the up-down direction of the lower end surface 15 of the 1st heat-transfer part 10 and the 2nd heat-transfer part can be supported stably.

  The upper surface side (the connection surface side with the 1st heat-transfer part 10) of the flange part 22 is made into the flat surface. Thereby, the load from the 1st heat-transfer part 10 can be received in the flange part 22 whole surface. In addition, since the lower surface side (the main body portion 21 side) of the flange portion 22 is also a flat surface, an overload per unit area in the connecting portion 30 can be reduced.

  Further, the outer diameter of the flange portion 22 of the second heat transfer section 20 is substantially the same as the outer diameter of the main body section 11 of the first heat transfer section 10. Thereby, the load from the 1st heat-transfer part 10 can be received by a larger area by the flange part 22. FIG.

  Moreover, it is preferable that the screwing and fixing position is on the outer peripheral side of the flange portion 22, and the lower end of the screw 37 after fixing is preferably above the lower surface side surface of the flange portion 22. Thereby, it is possible to prevent the screw 37 from receiving the load of the cryostat 2.

  Furthermore, in the connection part 30, an elastic member 32 is attached to the lower end surface 15 of the main body part 11 of the first heat transfer part 10 outside the outer periphery of the flange part 22. The elastic member 32 is provided at a position in contact with the upper surface 84 of the magnetic field generator 80 when the cryostat 2 is placed on the magnetic field generator 80. As a result, the impact caused by the contact with the magnetic field generator 80 can be alleviated and the stability of the cryostat 2 can be improved. Therefore, the elastic member 32 is preferably provided on the outer peripheral side of the main body 11 of the first heat transfer unit 10. The elastic member 32 can be attached by various methods such as screwing or bonding. Moreover, it is preferable that the elastic member 32 protrudes below the lower surface side surface of the flange part 22 in the state where the external force is not acting. As the elastic member 32, a material having a Young's modulus lower than that of the material constituting the first heat transfer unit 10 and the second heat transfer unit 20 of the cryostat 2 can be used. For example, rubber or resin is preferably used.

  As described above, according to the cooling device 1 described above, the connecting portion 30 in which the lower end surface 15 of the first heat transfer unit 10 and the flange portion 22 of the second heat transfer unit 20 are fixed to each other is connected to the magnetic field generation unit 80. The cryostat 2 is placed on the magnetic field generation unit 80 in a state of contact. Here, since the diameter of the first heat transfer unit 10 is larger than that of the second heat transfer unit 20, the load by the GM refrigerator 3, the first heat transfer unit 10, and the second heat transfer unit 20 through the connection unit 30. Can be stably received by the magnetic field generation unit 80, so that the cooling device 1 including the cryostat 2 can be stably installed. In the case of a conventional cryostat, it is necessary to use a support member or the like in order to increase the stability. However, the stability of the cooling device can be increased with a simpler structure.

  Moreover, the outer diameter of the flange part 22 is enlarged so that the outer diameter of the flange part 22 and the outer diameter of the main-body part 11 of the 1st heat-transfer part 10 may become substantially the same. Therefore, the stability of the cryostat 2 placed on the magnetic field generator 80 can be further improved.

  In addition, the connecting part 30 is provided with an elastic member 32 at a position where it contacts the magnetic field generating part 80. Thereby, it is possible to alleviate the impact when placing the connecting part 30 on the magnetic field generating part 80 and to further improve the stability of the cryostat 2. The elastic member 32 does not need to be attached to the lower end surface 15 side of the first heat transfer unit 10 and may be provided on the flange portion 22.

  The lower end surface 15 of the first heat transfer unit 10 is flat and is fastened by a screw 37 on the outer peripheral side of the flange portion 22. Further, the end portion of the screw 37 does not protrude from the flange portion 22. Thereby, since the 1st heat-transfer part 10 and the 2nd heat-transfer part 20 can be fixed more reliably and it can prevent that the screw | thread 37 and the magnetic field generation | occurrence | production part 80 contact | abut, the cryostat 2 can be stabilized. Can be placed.

  In the cooling device 1, the movement of the first heat transfer unit 10 in the horizontal direction is restricted by the restriction member 60 above the first heat transfer unit 10. Thus, the stability of the cryostat 2 including the first heat transfer unit 10 is further improved by including the regulating member 60 that regulates the movement in the direction different from the direction of the axis X.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment. For example, in the cryostat 2 of the above-described embodiment, a cold head for two stages is accommodated in the first heat transfer unit, and the sample S is accommodated in the second heat transfer unit 20. The configuration is not limited. Moreover, the 1st heat-transfer part 10 and the 2nd heat-transfer part 20 demonstrated the case where an external shape is a column shape, respectively. However, the 1st heat-transfer part 10 should just be substantially columnar shape, and is not specifically limited. Further, the shape of the second heat transfer unit 20 is not particularly limited.

  In addition, the configuration of the magnetic field generation unit 80 is not limited to the above embodiment, and can be appropriately changed, for example, the number of superconducting coils.

DESCRIPTION OF SYMBOLS 1 ... Cooling device, 2 ... Cryostat, 3 ... GM refrigerator, 10 ... 1st heat-transfer part, 20 ... 2nd heat-transfer part, 22 ... Flange part, 30 ... Connection part, 40 ... Radiation shield, 60 ... Restriction member 80 ... Magnetic field generator.

Claims (5)

A refrigerator for cooling the sample;
A main part thermally connected to the refrigerator, and a substantially columnar first heat transfer part extending in one direction;
A part of the first heat transfer part is thermally connected at one end to the main part, and the diameter of the second heat transfer part is smaller than that of the first heat transfer part and can accommodate the sample. A hot section,
A cryostat comprising:
A magnetic field generating part in which an opening for inserting the second heat transfer part is formed;
A cooling device comprising:
The second heat transfer part has a flange part protruding outward at one end part,
A connecting portion that connects the first heat transfer portion and the second heat transfer portion is formed by fixing the end surface on the one side of the first heat transfer portion and the flange portion to each other,
A cooling device in which the connecting portion is placed on the magnetic field generating portion.   The cooling device according to claim 1, wherein the flange portion is formed so that an outer diameter thereof is substantially the same as an outer diameter of the first heat transfer portion.   The cooling device according to claim 1, wherein the connecting portion is provided with an elastic member at a position in contact with the magnetic field generating portion.   The one end surface of the first heat transfer portion is flat, and the flange portion and the one end surface of the first heat transfer portion are fastened on the outer peripheral side of the flange portion, and the end portion is a flange. The cooling device according to any one of claims 1 to 3, wherein the one end surface of the first heat transfer section and the flange section are fixed to each other by a fastening member that does not protrude from the section. The cooling device according to any one of claims 1 to 4, further comprising a regulating member for regulating movement of the first heat transfer unit in a direction different from the one direction.

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