JP2017135236A - Superconducting magnet device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure a sufficiently small temperature difference between a cooled body side and a refrigerator side, while suppressing the weight of the device, in a superconducting magnet device.SOLUTION: A superconducting magnet device includes a refrigerator 14, a heat exhaust unit 21 connected thermally with the refrigerator, a heat exhaust pipeline 22 connected thermally with the heat exhaust unit, a superconducting coil 15, a heat receiving unit 23 connected thermally with the superconducting coil, a heat receiving pipeline 24 connected thermally with the heat receiving unit, a mediation pipeline 25 connecting one end of the heat exhaust pipeline and one end of the heat receiving pipeline, a telescopic unit 31 connected with at least one of the heat exhaust pipeline and heat receiving pipeline, and having stretchable structure, and a drive mechanism 32 for telescoping the telescopic unit. The superconducting magnet device is configured to be able to periodically reciprocate the cooling medium in the heat exhaust pipeline, heat receiving pipeline, and mediation pipeline, by telescopic operation of the telescopic unit, when the cooling medium is enclosed in the heat exhaust pipeline, heat receiving pipeline, mediation pipeline, and telescopic unit.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a superconducting (superconducting) magnet apparatus.

  Since the superconducting coil provided in the superconducting magnet device has no electrical resistance and no problem of heat generation, it can generate a stronger magnetic force than a normal coil. Superconducting magnet devices have already been put to practical use in magnetic resonance imaging (MRI) devices and the like.

  In a superconducting magnet device, the refrigeration efficiency may be low due to the principle of thermodynamics, and a large superconducting coil must be cooled by a refrigerator having a relatively small refrigerating capacity. In recent years, from the viewpoints of operability and cost, a conduction cooling superconducting magnet device using a small refrigerator has been widely used. In a conduction-cooling superconducting magnet device, a cooling stage of a small refrigerator and a superconducting coil are thermally connected by a heat transfer member.

  There is also a superconducting magnet device having a heat pipe that uses condensation and evaporation of a refrigerant such as helium and nitrogen to carry heat from a superconducting coil to a cooling stage of a refrigerator.

JP 2005-129609 A JP-A-9-306722

  In the conduction-cooling superconducting magnet device, the heat transfer member that is a metal cannot be enlarged without limitation from the viewpoint of weight reduction. Since the weight of the heat transfer member has a trade-off relationship with the temperature difference (pressure difference) between the high temperature side and the low temperature side, the temperature difference cannot be sufficiently reduced when the heat transfer member is made small and light. . When the temperature difference is large, that is, when the pressure difference is large, a load is applied to the compressor of the refrigerator, the heat insulation efficiency is deteriorated, and the refrigerating capacity is reduced.

  In a superconducting magnet device provided with a heat pipe, it is lighter and can carry a larger amount of heat than the above-described conduction cooling type. However, since the types of refrigerants used are limited, there are limitations on the operating temperature range, and the degree of freedom is low.

  Therefore, there is a demand for the development of a superconducting magnet device of a wide operating temperature range, light weight, and high efficiency. In particular, with the widespread use of superconducting magnet devices, the application to large superconducting coils and the field of strong magnetic fields will also advance.

  The problem to be solved by the present invention is to provide a superconducting magnet device capable of ensuring a sufficiently small temperature difference between the cooled object side and the refrigerator side while suppressing the weight of the device.

  The superconducting magnet device according to the present embodiment includes a refrigerator, a heat exhaust part thermally connected to the refrigerator, a heat exhaust pipe that is a pipe thermally connected to the heat exhaust part, and a superconducting coil. And a heat receiving part thermally connected to the superconducting coil, a heat receiving pipe which is a pipe thermally connected to the heat receiving part, and a pipe connecting one end of the exhaust heat pipe and one end of the heat receiving pipe And an expansion / contraction part connected to at least one of the exhaust heat pipe and the heat reception pipe, and having an extendable structure, and a drive mechanism for extending / contracting the extension / contraction part. In the superconducting magnet device, a refrigerant is sealed in the exhaust heat pipe, the heat receiving pipe, the intermediate pipe, and the expansion / contraction part, and the exhaust heat pipe, the heat reception pipe, and the intermediate pipe in the expansion / contraction operation of the expansion / contraction part The refrigerant can be reciprocated periodically.

  According to the superconducting magnet device according to the embodiment of the present invention, a sufficiently small temperature difference between the cooled object side and the refrigerator side can be ensured while suppressing the weight of the device.

Schematic which shows the structural example of the superconducting magnet apparatus which concerns on 1st Embodiment. Schematic which shows the structural example of the superconducting magnet apparatus which concerns on a prior art. Schematic which shows the structural example of the superconducting magnet apparatus which concerns on 2nd Embodiment. Schematic which shows the structural example of the superconducting magnet apparatus which concerns on 3rd Embodiment. Schematic which shows the structural example of the superconducting magnet apparatus which concerns on 4th Embodiment. Schematic which shows the structural example of the superconducting magnet apparatus which concerns on 5th Embodiment. Schematic which shows the structural example of the superconducting magnet apparatus which concerns on 6th Embodiment. Schematic which shows the structural example of the superconducting magnet apparatus which concerns on 7th Embodiment.

  A superconducting magnet device according to the present embodiment will be described with reference to the accompanying drawings.

(First embodiment)
1. Configuration FIG. 1 is a schematic diagram illustrating a configuration example of a superconducting magnet device according to the first embodiment.

  FIG. 1 shows a superconducting magnet device 1 according to a first embodiment. For example, the superconducting magnet apparatus 1 is mounted on an MRI apparatus or the like. The superconducting magnet device 1 includes a vacuum vessel 11, a heat shield part 12, a shield support member 13, a refrigerator 14, a superconducting coil (cooled body) 15, a coil support body 16, and a heat transport device 20.

  The vacuum vessel 11 is also referred to as an adiabatic vacuum vessel. The vacuum container 11 accommodates the heat shield part 12, the superconducting coil 15, and the like. The vacuum container 11 is in a vacuum state in order to suppress heat transfer with the outside. Thereby, the space between the superconducting coil 15 and the vacuum vessel 11 can be kept in a heat insulating state.

  The heat shield part 12 is provided so as to cover the superconducting coil 15 in order to prevent heat transfer from the vacuum vessel 11 to the superconducting coil 15 due to heat radiation. The heat shield part 12 is comprised with material with high heat conductivity, such as copper and aluminum, for example.

  Further, the heat shield part 12 is a composite material in which a rigid member such as stainless steel and FRP (Fiberglass Reinforced Plastics) is lined with a material having high thermal conductivity such as copper and aluminum in order to increase mechanical strength. It may be constituted by. In this case, the heat shield part 12 is installed so that the material side with high thermal conductivity becomes the opposing surface of the superconducting coil 15. Moreover, the heat shield part 12 is cooled by the refrigerator 14.

  The shield support member 13 supports the heat shield part 12 on the vacuum vessel 11.

  The refrigerator 14 is a single stage refrigerator or a multistage refrigerator. When the refrigerator 14 is a multi-stage refrigerator, the multi-stage refrigerator generates cryogenic cold through the multi-stage cooling stage. The multistage refrigerator as the refrigerator 14 is, for example, a two-stage 4K-Gifford McMahon (GM) refrigerator that can achieve a low reached temperature of about 4 [K] or less. The high-stage cooling stage of the two-stage refrigerator as the refrigerator 14 conducts and cools the members thermally connected to the high-stage cooling stage by the cold generated in the middle of the low-stage cooling stage. The lower cooling stage of the two-stage refrigerator as the refrigerator 14 conducts and cools a member thermally connected to the lower cooling stage by the generated cold.

  When the refrigerator 14 is a single-stage refrigerator, the single-stage refrigerator generates cryogenic cold through a single-stage cooling stage. The single-stage refrigerator as the refrigerator 14 is, for example, a GM refrigerator or a pulse tube type refrigerator that can achieve an ultimate temperature of about 40 K to 50 [K]. The only cooling stage provided in the single-stage refrigerator as the refrigerator 14 conducts and cools a member thermally connected to the cooling stage by the generated cold. GM refrigerators are lighter in terms of cost and maintenance than equipment that uses liquid nitrogen, liquid helium, or the like. Therefore, it is widely used for cooling superconducting materials such as MRI apparatuses and linear motor cars.

  Here, an example will be described in which the refrigerator 14 is a multistage refrigerator, and the heat transport device is thermally connected to a lower cooling stage 14a of a two-stage refrigerator as the refrigerator 14. When the refrigerator 14 is a multistage refrigerator, the heat transport device may be thermally connected to any one of a plurality of cooling stages.

The superconducting coil 15 is, for example, an Nb ₃ Sn superconducting coil in which metallic Nb ₃ Sn is used for the coil wire. The wire used for the coil is not limited to Nb ₃ Sn, and other metal-based superconducting wires may be used.

  The superconducting coil 15 is, for example, a high temperature superconducting coil in which an oxide-based high temperature superconducting wire is used as the coil wire. As the high-temperature superconducting wire, for example, a bismuth (for example, Bi2223) material or the like is used.

  The coil support 16 supports the superconducting coil 15 on the heat shield part 12.

  The heat transport device 20 includes an exhaust heat unit 21, an exhaust heat pipe 22, a heat receiving unit 23, a heat receiving pipe 24, an intermediate pipe 25, and an expansion / contraction control unit 26.

  The exhaust heat unit 21 is thermally connected to the cooling stage 14 a of the refrigerator 14. The term “thermally connected” means a non-contact state in which a distance capable of heat conduction is maintained in addition to a contact state.

  The exhaust heat pipe 22 is a pipe made of a material such as stainless steel having a low thermal conductivity and thermally connected to the exhaust heat section 21. The heat exchanger 21 and the exhaust heat pipe 22 form a heat exchanger. For example, the exhaust heat pipe 22 is wound around the exhaust heat portion 21 in a spiral shape.

  The heat receiving part 23 is thermally connected to the superconducting coil 15. In addition, when there are a plurality of superconducting coils 15, a heat transfer section 17 connected to the plurality of superconducting coils 15 may be provided. In that case, the heat receiving part 23 is thermally connected to the plurality of superconducting coils 15 via the heat transfer part 17.

  The heat receiving pipe 24 is a pipe made of a material such as stainless steel having a low thermal conductivity and thermally connected to the heat receiving portion 23. A heat exchanger is formed by the heat receiving part 23 and the heat receiving pipe 24. For example, the heat receiving pipe 24 is wound around the heat receiving portion 23 in a spiral shape. The heat receiving pipe 24 is preferably installed so that the height in the direction of gravity is lower than the height of the cooling stage 14a in the direction of gravity. By setting it as such a structure, the heat | fever penetration | invasion amount at the time of OFF of a thermal switch can be reduced.

  When the refrigerator 14 is stopped, the temperature of the cooling stage 14a rises. However, if the height of the cooling stage 14a is higher than the heat receiving pipe 24, the high-temperature refrigerant stays in the upper part without lowering. 24 does not invade. Therefore, it is possible to reduce the amount of heat penetration when the heat switch is OFF, and it is possible to reduce the rate of temperature rise of the superconducting coil 15.

  The intermediate pipe 25 is made of a material such as stainless steel having a low thermal conductivity, and is a pipe that connects one end of the exhaust heat pipe 22 and one end of the heat receiving pipe 24.

  The expansion / contraction control unit 26 is connected to at least one of the exhaust heat pipe and the heat receiving pipe. Here, the expansion / contraction control unit 26 includes a first expansion / contraction control unit 26 a connected to the exhaust heat pipe 22 and a second expansion / contraction control unit 26 b connected to the heat receiving pipe 24.

  The 1st expansion-contraction control part 26a is provided with the bellows 31 as an expansion-contraction part, and the linear drive mechanism (The coil 32 for bellows and the permanent magnet 33 for bellows) as a drive mechanism. The expansion / contraction section and the drive mechanism of the first expansion / contraction control section 26a are provided in a cylindrical housing (not shown) formed of a nonmagnetic material. The bellows 31 has an internal volume that is variable by an expansion / contraction operation, and is connected to one end of the exhaust heat pipe 22. As the bellows 31, a long-life member such as an electrodeposition bellows which is made of a metal that can be expanded and contracted even at an extremely low temperature and has a uniform thickness so that stress concentration hardly occurs at one place. The bellows 31 includes a movable bottom surface (a surface facing the connection surface with the exhaust heat pipe 22) that is movable by an expansion / contraction operation, and a fixed bottom surface (a connection surface with the exhaust heat pipe 22).

  The bellows coil 32 is disposed along the side surface of the cylindrical housing. The permanent magnet 33 for bellows is a cylindrical housing so that the movable bottom surface (the left side surface of the bellows 31 shown in FIG. 1) of the bellows 31 is reciprocated with respect to the fixed bottom surface (the right side surface of the bellows 31 shown in FIG. 1). The mover is capable of reciprocating in the axial direction (left and right direction in FIG. 1).

  The bellows coil 32 and the bellows permanent magnet 33 are drive mechanisms for expanding and contracting the bellows 31. The bellows 31 shown in FIG. 1 shows the extended state.

  The 2nd expansion-contraction control part 26b is provided with the bellows 41 as an expansion-contraction part, and the linear drive mechanism (The coil 42 for bellows and the permanent magnet 43 for bellows) as a drive mechanism. The expansion / contraction part and the drive mechanism of the second expansion / contraction control part 26b are provided in a cylindrical housing (not shown) formed of a nonmagnetic material. The bellows 41 has an internal volume that is variable by an expansion / contraction operation, and is connected to one end of the heat receiving pipe 24. As the bellows 41, similarly to the bellows 31, a long-life member such as an electrodeposition bellows is used. The bellows 41 includes a movable bottom surface (a surface facing the connection surface with the heat receiving pipe 24) that is movable by an expansion / contraction operation, and a fixed bottom surface (a connection surface with the heat receiving pipe 24).

  The bellows coil 42 is disposed along the side surface of the cylindrical housing. The bellows permanent magnet 43 is a cylindrical housing that reciprocates the movable bottom surface of the bellows 41 (the right side surface of the bellows 41 shown in FIG. 1) with respect to the fixed bottom surface (the left side surface of the bellows 41 shown in FIG. 1). The mover is capable of reciprocating in the axial direction (left and right direction in FIG. 1).

  The bellows coil 42 and the bellows permanent magnet 43 are drive mechanisms for expanding and contracting the bellows 41. The bellows 41 shown in FIG. 1 shows a contracted state. In addition, if the bellows 41 is extended, it will be in the state similar to the bellows 31 shown in FIG. The bellows permanent magnets 33 and 43 are shown with the vertical line in the center, which schematically shows the S pole and the N pole.

  Here, in the bellows 31, the exhaust heat pipe 22, the intermediate pipe 25, the heat receiving pipe 24, and the bellows 41 connected in order, a liquid or gaseous refrigerant is sealed. In FIG. 1, the portion in which the refrigerant is sealed is indicated by dots. The bellows 31 and 41 expand and contract periodically (repeatedly) with a predetermined phase difference. The predetermined phase difference is preferably an antiphase, but may be an almost antiphase. According to the expansion and contraction operation of the bellows 31 and 41, the refrigerant in the piping system of the exhaust heat pipe 22, the intermediate pipe 25, and the heat receiving pipe 24 can be periodically reciprocated.

  First, in the process in which the bellows 31 contracts and the process in which the bellows 41 extends, the bellows 31 pushes the refrigerant toward the exhaust heat pipe 22, and the bellows 41 draws the refrigerant from the heat receiving pipe 24. That is, in the process in which the bellows 31 is contracted and the process in which the bellows 41 is extended, the refrigerant in the bellows 31 flows toward the exhaust heat pipe 22, and the refrigerant in the exhaust heat pipe 22 flows toward the medium pipe 25. The refrigerant in 25 flows toward the heat receiving pipe 24, and the refrigerant in the heat receiving pipe 24 flows toward the bellows 41.

  Second, in the process in which the bellows 31 is extended and the bellows 41 is contracted, the bellows 31 draws the refrigerant from the exhaust heat pipe 22, and the bellows 41 pushes the refrigerant toward the heat receiving pipe 24. That is, in the process in which the bellows 31 is extended and the process in which the bellows 41 is contracted, the refrigerant in the bellows 41 flows toward the heat receiving pipe 24, the refrigerant in the heat receiving pipe 24 flows toward the intermediate pipe 25, and This refrigerant flows toward the exhaust heat pipe 22, and the refrigerant in the exhaust heat pipe 22 flows toward the bellows 31.

  In the heat exchanger formed by the exhaust heat section 21 and the exhaust heat pipe 22, heat exchange is performed between the refrigerant moving into the exhaust heat pipe 22 by the expansion and contraction of the bellows 31 and 41 and the cooling stage 14a. Is called. Further, in the heat exchanger formed by the heat receiving part 23 and the heat receiving pipe 24, heat exchange is performed between the refrigerant moving into the heat receiving pipe 24 by the expansion and contraction operation of the bellows 31 and 41 and the superconducting coil 15. .

2. Operation The operation of the superconducting magnet device 1 will be described using the configuration of the superconducting magnet device 1 shown in FIG.

  The refrigerant in the exhaust heat pipe 22 of the superconducting magnet device 1 is cooled by the exhaust heat section 21 that is thermally connected to the cooling stage 14a. Further, the refrigerant in the heat receiving pipe 24 is warmed by cooling the heat receiving portion 23 that is thermally connected to the superconducting coil 15. When the bellows 31 and 41 are periodically expanded and contracted with a predetermined phase difference, the refrigerant in the piping system of the exhaust heat pipe 22, the intermediate pipe 25, and the heat receiving pipe 24 is reciprocated.

  In the process in which the bellows 31 is extended and the process in which the bellows 41 is contracted, the refrigerant warmed in the heat receiving pipe 24 moves to the exhaust heat pipe 22 through the intermediate pipe 25. The refrigerant that has moved to the exhaust heat pipe 22 is cooled by the exhaust heat section 21 that is thermally connected to the cooling stage 14a.

  In the process in which the bellows 31 is further contracted and the process in which the bellows 41 is extended, the refrigerant cooled in the exhaust heat pipe 22 moves to the superconducting coil 15 side via the intermediate pipe 25. The refrigerant that has moved to the heat receiving pipe 24 is warmed again by cooling the heat receiving portion 23 that is thermally connected to the superconducting coil 15.

  As described above, by the expansion and contraction of the bellows 31 and 41, the heat generated by the superconducting coil 15 can be steadily moved to the cooling stage 14a via the intermediate pipe 25.

  Here, the temperature difference between the superconducting coil 15 side and the refrigerator 14 side can be controlled (designed) by the specific heat of the refrigerant sealed in the piping system, the flow rate of the reciprocating refrigerant, the flow rate of the refrigerant, and the like. It becomes. That is, in the superconducting magnet device 1, there is no restriction on the temperature region as in the case where a heat pipe is used.

  Further, in the superconducting magnet device 1, by adjusting the expansion / contraction amount of the bellows 31 and 41 according to the change in the heat generation amount, it is possible to perform control that can cope with the change in the heat generation amount. When the calorific value is relatively large, for example, in the case of pre-cooling a superconducting magnet having a relatively large weight (cooling from room temperature to a predetermined temperature), and when the calorific value is relatively small, for example, in a steady state Highly efficient heat transport is possible.

  Further, as described above, a material such as stainless steel having a low thermal conductivity is used for the piping system. By stopping the expansion and contraction operation of the bellows 31 and 41 when the refrigerator 14 is stopped, the heat transport by the heat transport device 20 can be reduced (insulated) including the heat conduction of the piping system. When the refrigerator 14 is stopped unintentionally as in the case of a trouble, it is possible to make it difficult to transmit heat intrusion due to the temperature rise of the cooling stage 14a to the superconducting coil 15, and to reduce the temperature rise rate of the superconducting coil 15. Is possible. The time to rise to the critical temperature in the superconducting coil 15 is extended, and the time for which the superconducting state can be maintained can be increased.

  In addition, when the refrigerator 14 is intentionally stopped to increase the temperature of the cooling stage 14a to the room temperature level, such as when the refrigerator 14 is replaced or maintained, heat intrusion from the refrigerator 14 is prevented. Thus, the temperature rise of the superconducting coil 15 can be suppressed. That is, it is effective in shortening the recooling time. By further increasing the length of each piping in the piping system and further reducing the cross-sectional area, the amount of heat penetration due to conduction can be reduced, and the temperature rise of the superconducting coil 15 can be further suppressed.

  FIG. 2 is a schematic diagram illustrating a configuration example of a superconducting magnet device according to the related art.

  FIG. 2 shows a conduction-cooling superconducting magnet device P according to the prior art. The superconducting magnet device P includes a vacuum vessel 11, a heat shield part 12, a shield support member 13, a refrigerator 14, a superconducting coil 15, a coil support 16, and a heat transfer member L. In FIG. 2, the same members as those shown in FIG.

  As the heat transfer member L, a material such as oxygen-free copper or high-purity aluminum having a high thermal conductivity at a very low temperature is generally used. In the superconducting magnet device P, the heat transfer member L, which is a metal, cannot be increased without limitation from the viewpoint of weight reduction. Since the weight of the heat transfer member L is in a trade-off relationship with the temperature difference between the high temperature side and the low temperature side, a sufficiently small temperature difference cannot be obtained when the heat transfer member L is made small and light.

3. Effect According to the superconducting magnet device 1 according to the first embodiment, a sufficiently small temperature difference between the superconducting coil 15 side and the refrigerator 14 side can be ensured while suppressing the weight of the superconducting magnet device 1.

(Second Embodiment)
1. Configuration FIG. 3 is a schematic diagram illustrating a configuration example of a superconducting magnet device according to the second embodiment.

  FIG. 3 shows a superconducting magnet device 1A according to the second embodiment. The superconducting magnet device 1A includes a vacuum vessel 11, a heat shield part 12, a shield support member 13, a refrigerator 14, a superconducting coil 15, a coil support 16 and a heat transport device 20A.

  The heat transport apparatus 20 </ b> A includes a heat exhaust unit 21, a heat exhaust pipe 22, a heat receiver 23, a heat receiver pipe 24, and a medium pipe 25, similarly to the heat transport apparatus 20 illustrated in FIG. 1. Here, the exhaust heat pipe 22 is referred to as a first exhaust heat pipe 22, and the intermediate pipe 25 is referred to as a first intermediate pipe 25.

  In addition, the heat transport device 20A includes an expansion / contraction control unit 26A, a second exhaust heat pipe 27, and a second intermediate pipe 28.

  The second exhaust heat pipe 27 is a pipe made of a material such as stainless steel having a low thermal conductivity and thermally connected to the exhaust heat section 21. The heat exchanger 21 and the second heat exhaust pipe 27 form a heat exchanger. For example, the second heat exhaust pipe 27 is spirally wound around the heat exhaust section 21.

  The second intermediate pipe 28 is made of a material such as stainless steel having a low thermal conductivity, and is a pipe that connects one end of the heat receiving pipe 24 and one end of the second exhaust heat pipe 27.

  The expansion / contraction control unit 26A is connected to at least one of the exhaust heat pipe and the heat receiving pipe. Here, the expansion / contraction control unit 26 </ b> A includes a first expansion / contraction control unit 26 a connected to the first exhaust heat pipe 22 and a third expansion / contraction control unit 26 c connected to the second exhaust heat pipe 27.

  The 3rd expansion-contraction control part 26c is provided with the bellows 51 as an expansion-contraction part, and the linear drive mechanism (The bellows coil 52 and the bellows permanent magnet 53) as a drive mechanism. The expansion / contraction section and the drive mechanism of the third expansion / contraction control section 26c are provided in a cylindrical housing (not shown) formed of a nonmagnetic material. The bellows 51 has an internal volume that is variable by an expansion and contraction operation, and is connected to one end of the second heat exhaust pipe 27. As the bellows 51, similarly to the bellows 31, a long-life member such as an electrodeposition bellows is used. The bellows 51 includes a movable bottom surface (a surface facing the connection surface with the second heat exhaust pipe 27) that is movable by an expansion / contraction operation, and a fixed bottom surface (a connection surface with the second heat exhaust pipe 27).

  The bellows coil 52 is disposed along the side surface of the cylindrical housing. The permanent magnet 53 for bellows is a cylindrical casing so that the movable bottom surface (the left side surface of the bellows 51 shown in FIG. 3) of the bellows 51 is reciprocated with respect to the fixed bottom surface (the right side surface of the bellows 51 shown in FIG. 3). The mover is capable of reciprocating in the axial direction (left and right direction in FIG. 3).

  The bellows coil 52 and the bellows permanent magnet 53 are drive mechanisms for expanding and contracting the bellows 51. The bellows 31 shown in FIG. 3 shows an extended state, and the bellows 51 shows a contracted state.

  Here, the bellows 31, the first exhaust heat pipe 22, the first intermediate pipe 25, the heat receiving pipe 24, the second intermediate pipe 28, the second exhaust heat pipe 27, and the bellows 51 that are connected in order are liquid or gaseous. State refrigerant is sealed. In FIG. 3, the portion in which the refrigerant is sealed is indicated by dots. The bellows 31 and 51 periodically expand and contract with a predetermined phase difference. The predetermined phase difference is preferably an antiphase, but may be an almost antiphase. According to the expansion and contraction operation of the bellows 31 and 51, the refrigerant in the piping system of the first exhaust heat pipe 22, the first intermediate pipe 25, the heat receiving pipe 24, the second intermediate pipe 28, and the second exhaust heat pipe 27 is cycled. Can be moved back and forth.

  First, in the process in which the bellows 31 contracts and the process in which the bellows 51 extends, the bellows 31 pushes out the refrigerant toward the first exhaust heat pipe 22, and the bellows 51 draws the refrigerant from the second exhaust heat pipe 27. That is, in the process in which the bellows 31 contracts and the process in which the bellows 51 extends, the refrigerant in the bellows 31 flows toward the first exhaust heat pipe 22, and the refrigerant in the first exhaust heat pipe 22 flows into the first intermediate pipe 25. The refrigerant in the first intermediate pipe 25 flows toward the heat receiving pipe 24, the refrigerant in the heat receiving pipe 24 flows toward the second intermediate pipe 28, and the refrigerant in the second intermediate pipe 28 passes through the second exhaust pipe. The refrigerant flows toward the heat pipe 27, and the refrigerant in the second exhaust heat pipe 27 flows toward the bellows 51.

  Secondly, in the process in which the bellows 31 extends and the bellows 51 contracts, the bellows 31 draws the refrigerant from the first exhaust heat pipe 22, and the bellows 51 pushes the refrigerant toward the second exhaust heat pipe 27. That is, in the process in which the bellows 31 is extended and the process in which the bellows 51 is contracted, the refrigerant in the bellows 51 flows toward the second exhaust heat pipe 27, and the refrigerant in the second exhaust heat pipe 27 flows into the second intermediate pipe 28. The refrigerant in the second intermediate pipe 28 flows toward the heat receiving pipe 24, the refrigerant in the heat receiving pipe 24 flows toward the first intermediate pipe 25, and the refrigerant in the first intermediate pipe 25 passes through the first exhaust pipe 24. The refrigerant flows toward the heat pipe 22, and the refrigerant in the first exhaust heat pipe 22 flows toward the bellows 31.

  The heat exchanger formed by the exhaust heat section 21 and the first exhaust heat pipe 22 and the heat exchanger formed by the exhaust heat section 21 and the second exhaust heat pipe 27 are exhausted by the expansion and contraction of the bellows 31 and 51. Heat exchange is performed between the refrigerant moving into the heat pipes 22 and 27 and the cooling stage 14a. Further, in the heat exchanger formed by the heat receiving portion 23 and the heat receiving pipe 24, heat exchange is performed between the refrigerant moving into the heat receiving pipe 24 and the superconducting coil 15 by the expansion and contraction of the bellows 31 and 41.

  That is, the heat transport device 20A does not have the expansion / contraction control unit in the vicinity of the heat receiving unit 23 by simply increasing the number of pipes compared to the heat transport device 20 shown in FIG. In the heat transport device 20A, since the plurality of expansion / contraction control units are installed in a close place as compared with the heat transport device 20, the plurality of expansion / contraction control units can be integrated in a compact manner as a whole. Further, by adopting a configuration like the heat transport device 20A, the same control as the heat transport device 20 allows the heat transport amount to be increased by 2 from one to two pipes in addition to the effect of the heat transport device 20. Doubled.

  In the heat transport device 20A, the number of intermediate pipes is not limited to one or two, and may be n (n = 1, 2,...). The amount of heat transport due to the increase in the number of intermediate pipes from one to n is n times. However, since the overall length of the intermediate pipe increases, it is necessary to design in consideration of an increase in pressure loss due to the flow rate in the intermediate pipe.

2. Operation The operation of the superconducting magnet device 1A will be described using the configuration of the superconducting magnet device 1A shown in FIG.

  The refrigerant in the exhaust heat pipes 22 and 27 of the superconducting magnet device 1A is cooled by the exhaust heat section 21 that is thermally connected to the cooling stage 14a. Further, the refrigerant in the heat receiving pipe 24 is warmed by cooling the heat receiving portion 23 that is thermally connected to the superconducting coil 15. When the bellows 31 and 51 are periodically expanded and contracted with a predetermined phase difference, the first exhaust heat pipe 22, the first intermediate pipe 25, the heat receiving pipe 24, the second intermediate pipe 28, and the second exhaust heat pipe 27. The refrigerant in the piping system is reciprocated.

  In the process in which the bellows 31 is extended and the process in which the bellows 51 is contracted, the refrigerant cooled in the second exhaust heat pipe 27 moves to the heat receiving pipe 24 via the second intermediate pipe 28 and in the heat receiving pipe 24. The warmed refrigerant moves to the first exhaust heat pipe 22 through the first intermediate pipe 25.

  The refrigerant that has moved to the heat receiving pipe 24 via the second intermediate pipe 28 is warmed by cooling the heat receiving portion 23 that is thermally connected to the superconducting coil 15, and the first refrigerant via the first intermediate pipe 25. The refrigerant that has moved to the exhaust heat pipe 22 is cooled by the exhaust heat section 21 that is thermally connected to the cooling stage 14a. That is, the superconducting coil 15 is cooled by the refrigerant that has moved to the heat receiving pipe 24 via the second intermediate pipe 28.

  In the subsequent process of contracting the bellows 31 and the process of expanding the bellows 51, the refrigerant cooled in the first exhaust heat pipe 22 moves to the heat receiving pipe 24 through the first intermediate pipe 25, and in the heat receiving pipe 24. The refrigerant heated in step moves to the second exhaust heat pipe 27 through the second intermediate pipe 28.

  The refrigerant that has moved to the heat receiving pipe 24 via the first intermediate pipe 25 is warmed by cooling the heat receiving portion 23 that is thermally connected to the superconducting coil 15, and the second refrigerant via the second intermediate pipe 28. The refrigerant that has moved to the exhaust heat pipe 27 is cooled by the exhaust heat section 21 that is thermally connected to the cooling stage 14a. That is, the superconducting coil 15 is cooled by the refrigerant that has moved to the heat receiving pipe 24 via the first intermediate pipe 25.

  As described above, by the expansion and contraction of the bellows 31 and 51, the heat generated by the superconducting coil 15 can be steadily moved to the cooling stage 14a via the intermediate pipes 25 and 28.

3. Effect According to the superconducting magnet device 1A according to the second embodiment, a sufficiently small temperature difference between the superconducting coil 15 side and the refrigerator 14 side can be secured while suppressing the weight of the superconducting magnet device 1A.

(Third embodiment)
1. Configuration FIG. 4 is a schematic diagram illustrating a configuration example of a superconducting magnet device according to a third embodiment.

  FIG. 4 shows a superconducting magnet device 1B according to the third embodiment. The superconducting magnet device 1B includes a vacuum vessel 11, a heat shield part 12, a shield support member 13, a refrigerator 14, a superconducting coil 15, a coil support body 16, and a heat transport device 20B.

  The heat transport apparatus 20 </ b> B includes a heat exhaust unit 21, a heat exhaust pipe 22, a heat receiver 23, a heat receiver pipe 24, and a medium pipe 25, similarly to the heat transport apparatus 20 illustrated in FIG. 1. Here, the heat receiving pipe 23 is referred to as a first heat receiving pipe 23, and the intermediate pipe 25 is referred to as a first intermediate pipe 25.

  In addition, the heat transport device 20B includes an expansion / contraction control unit 26B, a second intermediate pipe 28, and a second heat receiving pipe 29.

  The second heat receiving pipe 29 is a pipe made of a material such as stainless steel having a low thermal conductivity and thermally connected to the heat receiving unit 23. A heat exchanger is formed by the heat receiving part 23 and the second heat receiving pipe 29. For example, the second heat receiving pipe 29 is wound around the heat receiving portion 23 in a spiral shape. It is preferable that at least one of the heat receiving pipes 24 and 29 is installed such that the height in the gravitational direction is lower than the height of the cooling stage 14a in the gravitational direction. By setting it as such a structure, the heat | fever penetration | invasion amount at the time of OFF of a thermal switch can be reduced.

  The second intermediate pipe 28 is made of a material such as stainless steel having a low thermal conductivity, and is a pipe that connects one end of the exhaust heat pipe 22 and one end of the second heat receiving pipe 29.

  The expansion / contraction control unit 26B is connected to at least one of the exhaust heat pipe and the heat receiving pipe. Here, the expansion / contraction control unit 26 </ b> B includes a second expansion / contraction control unit 26 b connected to the first heat receiving pipe 24 and a fourth expansion / contraction control unit 26 d connected to the second heat receiving pipe 29.

  The fourth expansion / contraction control unit 26d includes a bellows 61 as an expansion / contraction part and a linear drive mechanism (bellows coil 62 and bellows permanent magnet 63) as a drive mechanism. The expansion / contraction part and the drive mechanism of the fourth expansion / contraction control part 26d are provided in a cylindrical housing (not shown) formed of a nonmagnetic material. The bellows 61 has an internal volume that is variable by an expansion / contraction operation, and is connected to one end of the second heat receiving pipe 29. As the bellows 61, similarly to the bellows 41, a long-life member such as an electrodeposition bellows is used. The bellows 61 includes a movable bottom surface (a surface facing the connection surface with the second heat receiving pipe 29) that is movable by an expansion / contraction operation, and a fixed bottom surface (a connection surface with the second heat receiving pipe 29).

  The bellows coil 62 is disposed along the side surface of the cylindrical housing. The bellows permanent magnet 63 has a cylindrical housing so as to reciprocate the movable bottom surface of the bellows 61 (the right side surface of the bellows 61 shown in FIG. 4) with respect to the fixed bottom surface (the left side surface of the bellows 61 shown in FIG. 4). This is a mover that can reciprocate in the axial direction (left-right direction in FIG. 4).

  The bellows coil 62 and the bellows permanent magnet 63 are drive mechanisms for expanding and contracting the bellows 61. The bellows 41 shown in FIG. 4 shows an extended state, and the bellows 61 shows a contracted state.

  Here, the bellows 41, the first heat receiving pipe 24, the first intermediate pipe 25, the exhaust heat pipe 22, the second intermediate pipe 28, the second heat receiving pipe 29, and the bellows 61 connected in order are in a liquid or gaseous state. The refrigerant is sealed. In FIG. 4, the portion in which the refrigerant is sealed is indicated by dots. Further, the bellows 41 and 61 periodically expand and contract with a predetermined phase difference. The predetermined phase difference is preferably an antiphase, but may be an almost antiphase. According to the expansion and contraction operation of the bellows 41 and 61, the refrigerant in the piping system of the first heat receiving pipe 24, the first intermediate pipe 25, the exhaust heat pipe 22, the second intermediate pipe 28, and the second heat receiving pipe 29 is periodically discharged. Can be reciprocated.

  First, in the process in which the bellows 41 contracts and the process in which the bellows 61 extends, the bellows 41 pushes out the refrigerant toward the first heat receiving pipe 24, and the bellows 61 draws the refrigerant from the second heat receiving pipe 29. That is, in the process in which the bellows 41 contracts and the process in which the bellows 61 extends, the refrigerant in the bellows 41 flows toward the first heat receiving pipe 24, and the refrigerant in the first heat receiving pipe 24 moves toward the first intermediate pipe 25. The refrigerant in the first intermediate pipe 25 flows toward the exhaust heat pipe 22, the refrigerant in the exhaust heat pipe 22 flows toward the second intermediate pipe 28, and the refrigerant in the second intermediate pipe 28 receives the second heat receiving heat. The refrigerant flows toward the pipe 29, and the refrigerant in the second heat receiving pipe 29 flows toward the bellows 61.

  Secondly, in the process in which the bellows 41 extends and the bellows 61 contracts, the bellows 41 draws the refrigerant from the first heat receiving pipe 24, and the bellows 61 pushes the refrigerant toward the second heat receiving pipe 29. That is, in the process in which the bellows 41 extends and the process in which the bellows 61 contracts, the refrigerant in the bellows 61 flows toward the second heat receiving pipe 29, and the refrigerant in the second heat receiving pipe 29 moves toward the second intermediate pipe 28. The refrigerant in the second intermediate pipe 28 flows toward the exhaust heat pipe 22, the refrigerant in the exhaust heat pipe 22 flows toward the first intermediate pipe 25, and the refrigerant in the first intermediate pipe 25 receives the first heat receiving heat. The refrigerant flows toward the pipe 24, and the refrigerant in the first heat receiving pipe 24 flows toward the bellows 41.

  In the heat exchanger formed by the exhaust heat section 21 and the exhaust heat pipe 22, heat exchange is performed between the refrigerant moving into the exhaust heat pipe 22 by the expansion and contraction operation of the bellows 41 and 61 and the cooling stage 14a. Is called. Moreover, in the heat exchanger formed by the heat receiving part 23 and the first heat receiving pipe 24 and the heat exchanger formed by the heat receiving part 23 and the second heat receiving pipe 29, the heat receiving pipe 24 is obtained by the expansion and contraction operation of the bellows 41 and 61. , 29 and heat exchange between the refrigerant moving into the superconducting coil 15.

  That is, the heat transport device 20B does not have the expansion / contraction control unit in the vicinity of the exhaust heat unit 21 by simply increasing the number of pipes compared to the heat transport device 20 shown in FIG. In the heat transport device 20B, since the plurality of expansion / contraction control units are installed in a close place as compared with the heat transport device 20, the plurality of expansion / contraction control units can be compactly integrated as a whole. Further, by adopting a configuration such as the heat transport device 20B, the same control as the heat transport device 20 allows the heat transport amount to be increased by 2 from one to two pipes in addition to the effect of the heat transport device 20. Doubled.

  In the heat transport device 20B, the number of intermediate pipes is not limited to one or two, and may be n. The amount of heat transport due to the increase in the number of intermediate pipes from one to n is n times. However, since the overall length of the intermediate pipe increases, it is necessary to design in consideration of an increase in pressure loss due to the flow rate in the intermediate pipe.

2. Operation The operation of the superconducting magnet device 1B will be described using the configuration of the superconducting magnet device 1B shown in FIG.

  The refrigerant in the exhaust heat pipe 22 of the superconducting magnet device 1B is cooled by the exhaust heat section 21 that is thermally connected to the cooling stage 14a. In addition, the refrigerant in the heat receiving pipes 24 and 29 is warmed by cooling the heat receiving portion 23 thermally connected to the superconducting coil 15. When the bellows 41 and 61 are periodically expanded and contracted with a predetermined phase difference, the first heat receiving pipe 24, the first intermediate pipe 25, the exhaust heat pipe 22, the second intermediate pipe 28, and the second heat receiving pipe 29. The refrigerant in the piping system is reciprocated.

  In the process in which the bellows 41 contracts and the process in which the bellows 61 extends, the refrigerant heated in the first heat receiving pipe 24 moves to the heat exhaust pipe 22 through the first intermediate pipe 25 and in the heat exhaust pipe 22. The refrigerant cooled in the step moves to the second heat receiving pipe 29 through the second intermediate pipe 28.

  The refrigerant that has moved to the exhaust heat pipe 22 via the first intermediate pipe 25 is cooled by the exhaust heat section 21 that is thermally connected to the cooling stage 14a, and is also supplied with the second heat reception via the second intermediate pipe 28. The refrigerant that has moved to the pipe 29 is warmed by cooling the heat receiving portion 23 that is thermally connected to the superconducting coil 15. That is, the superconducting coil 15 is cooled by the refrigerant that has moved to the second heat receiving pipe 29 via the second intermediate pipe 28.

  In the process in which the bellows 41 extends and the process in which the bellows 61 contracts, the refrigerant warmed in the second heat receiving pipe 29 moves to the heat exhaust pipe 22 through the second intermediate pipe 28 and the exhaust heat pipe 22. The refrigerant cooled inside moves to the first heat receiving pipe 24 through the first intermediate pipe 25.

  The refrigerant that has traveled to the exhaust heat pipe 22 via the second intermediate pipe 28 is cooled by the exhaust heat section 21 that is thermally connected to the cooling stage 14a, and also receives the first heat reception via the first intermediate pipe 25. The refrigerant that has moved to the pipe 24 is warmed by cooling the heat receiving portion 23 that is thermally connected to the superconducting coil 15. That is, the superconducting coil 15 is cooled by the refrigerant that has moved to the heat receiving pipe 24 via the first intermediate pipe 25.

  As described above, by the expansion and contraction of the bellows 41 and 61, the heat generated by the superconducting coil 15 can be steadily moved to the cooling stage 14a via the intermediate pipes 25 and 28.

3. Effect According to the superconducting magnet device 1B according to the second embodiment, a sufficiently small temperature difference between the superconducting coil 15 side and the refrigerator 14 side can be ensured while suppressing the weight of the superconducting magnet device 1B.

(Fourth embodiment)
1. Configuration FIG. 5 is a schematic diagram illustrating a configuration example of a superconducting magnet device according to a fourth embodiment.

  FIG. 5 shows a superconducting magnet apparatus 1C according to the fourth embodiment. The superconducting magnet device 1C includes a vacuum vessel 11, a heat shield part 12, a shield support member 13, a refrigerator 14, a superconducting coil 15, a coil support body 16, and a heat transport device 20C.

  The heat transport device 20C is similar to the heat transport device 20A shown in FIG. 3 in that the exhaust heat section 21, the first exhaust heat pipe 22, the heat reception section 23, the heat reception pipe 24, the first intermediate pipe 25, and the second exhaust heat pipe 27. , And a second intermediate pipe 28.

  In addition, the heat transport device 20C includes an expansion / contraction control unit 26C.

  The expansion / contraction control unit 26C is connected to at least one of the exhaust heat pipe and the heat receiving pipe. Here, the expansion / contraction control unit 26 </ b> C is connected to the first exhaust heat pipe 22 and the second exhaust heat pipe 27.

  The expansion / contraction control unit 26 </ b> C includes bellows 31 and 51 as expansion / contraction units, and linear drive mechanisms (bellows coil 32 and bellows permanent magnet 33) as drive mechanisms. The expansion / contraction part and the drive mechanism of the expansion / contraction control part 26C are provided in a cylindrical housing (not shown) formed of a nonmagnetic material. The bellows 51 is installed so as to face the bellows 31 with the bellows permanent magnet 33 interposed therebetween. The bellows 31 includes a movable bottom surface (a surface facing the connection surface with the first heat exhaust pipe 22) that is movable by an expansion / contraction operation, and a fixed bottom surface (a connection surface with the first heat exhaust pipe 22). The bellows 51 includes a movable bottom surface (a surface facing the connection surface with the second heat exhaust pipe 27) that is movable by an expansion / contraction operation, and a fixed bottom surface (a connection surface with the second heat exhaust pipe 27).

  The bellows coil 32 is disposed along the side surface of the cylindrical housing. The bellows permanent magnet 33 reciprocates the movable bottom surface of the bellows 31 (the bottom surface of the bellows 31 shown in FIG. 5) with respect to the fixed bottom surface (the top surface of the bellows 31 shown in FIG. 5). Reciprocating movement in the axial direction (vertical direction in FIG. 5) of the cylindrical housing so that the bottom surface (upper surface of the bellows 51 shown in FIG. 5) is reciprocated with respect to the fixed bottom surface (lower surface of the bellows 51 shown in FIG. 5). It is a possible mover.

  The bellows coil 32 and the bellows permanent magnet 33 are drive mechanisms for expanding and contracting the bellows 31 and 51. The bellows 31 shown in FIG. 5 shows an extended state, and the bellows 51 shows a contracted state.

  Here, similarly to the heat transport device 20A of FIG. 3, the bellows 31, the first exhaust heat pipe 22, the first intermediate pipe 25, the heat receiving pipe 24, the second intermediate pipe 28, and the second exhaust heat pipe 27 that are connected in order. The bellows 51 is filled with a liquid or gaseous refrigerant. In FIG. 5, the portion in which the refrigerant is sealed is indicated by dots. Further, similarly to the heat transport device 20A of FIG. 3, the bellows 31, 51 periodically expands and contracts with a predetermined phase difference. The predetermined phase difference is preferably an antiphase, but may be an almost antiphase. According to the expansion and contraction operation of the bellows 31 and 51, the refrigerant in the piping system of the first exhaust heat pipe 22, the first intermediate pipe 25, the heat receiving pipe 24, the second intermediate pipe 28, and the second exhaust heat pipe 27 is cycled. Can be moved back and forth.

  That is, the heat transport device 20C does not have an expansion / contraction control unit in the vicinity of the heat receiving unit 23 by simply increasing the number of pipes compared to the heat transport device 20 shown in FIG. In the heat transport device 20C, since the plurality of expansion / contraction control units are installed in a close place as compared with the heat transport device 20, the plurality of expansion / contraction control units can be compactly integrated as a whole. Further, by adopting a configuration such as the heat transport device 20C, the same control as that of the heat transport device 20, in addition to the effect of the heat transport device 20, the heat transport amount due to the increase in the number of intermediate pipes from one to two is 2 Doubled.

  In the heat transport device 20C, the number of intermediate pipes is not limited to one or two, and may be n. The amount of heat transport due to the increase in the number of intermediate pipes from one to n is n times. However, since the overall length of the intermediate pipe increases, it is necessary to design in consideration of an increase in pressure loss due to the flow rate in the intermediate pipe.

  Note that the superconducting magnet device 1C realizes downsizing of the device in a piping system equivalent to the piping system of the superconducting magnet device 1A (shown in FIG. 3) that consolidates the expansion and contraction control unit on the exhaust heat side. In the present invention, the apparatus may be reduced in size in a piping system equivalent to the piping system of the superconducting magnet device 1B (shown in FIG. 4) that consolidates the expansion / contraction control unit on the heat receiving side.

2. Action The action of the superconducting magnet device 1C is the same as that of the superconducting magnet apparatus 1A shown in FIG.

3. Effect According to the superconducting magnet device 1C according to the fourth embodiment, a sufficiently small temperature difference between the superconducting coil 15 side and the refrigerator 14 side can be ensured while suppressing the weight of the superconducting magnet device 1C. Further, according to the superconducting magnet device 1C according to the fourth embodiment, the expansion / contraction control unit can be simplified and downsized as compared with the superconducting magnet device 1A shown in FIG. 3 and the superconducting magnet device 1B shown in FIG. There are benefits.

(Fifth embodiment)
1. Configuration FIG. 6 is a schematic diagram illustrating a configuration example of a superconducting magnet device according to a fifth embodiment.

  FIG. 6 shows a superconducting magnet device 1D according to the fifth embodiment. The superconducting magnet device 1D includes a vacuum vessel 11, a heat shield part 12, a shield support member 13, a refrigerator 14, a superconducting coil 15, a coil support body 16, and a heat transport device 20D.

  Similarly to the heat transport device 20A shown in FIG. 3, the heat transport device 20D has a heat exhaust part 21, a first heat exhaust pipe 22, a heat receiver 23, a heat receiver pipe 24, a first intermediate pipe 25, and a second heat exhaust pipe 27. , And a second intermediate pipe 28.

  In addition, the heat transport device 20D includes an expansion / contraction control unit 26D.

  The expansion / contraction control unit 26D is connected to at least one of the exhaust heat pipe and the heat receiving pipe. Here, the expansion / contraction control unit 26 </ b> D is connected to the first exhaust heat pipe 22 and the second exhaust heat pipe 27.

  The expansion / contraction control unit 26 </ b> D includes a bellows 31 as an expansion / contraction part, a linear drive mechanism (bellows coil 32 and bellows permanent magnet 33) as a drive mechanism, and a container 71. The expansion / contraction section and the drive mechanism of the expansion / contraction control section 26D are provided in a cylindrical housing (not shown) formed of a nonmagnetic material. The bellows 31 includes a movable bottom surface (a surface facing the connection surface with the first heat exhaust pipe 22) that is movable by an expansion / contraction operation, and a fixed bottom surface (a connection surface with the first heat exhaust pipe 22).

  The bellows coil 32 is disposed along the side surface of the cylindrical housing. The bellows permanent magnet 33 is configured so that the movable bottom surface of the bellows 31 (the bottom surface of the bellows 31 shown in FIG. 6) reciprocates with respect to the fixed bottom surface (the top surface of the bellows 31 shown in FIG. 6). This is a mover that can reciprocate in the direction (vertical direction in FIG. 6).

  The container 71 is installed such that the space in which the bellows 31 expands and contracts and the space V1 that faces the bellows 31 with the bellows permanent magnet 33 interposed therebetween are partitioned by the bellows permanent magnet 33. The space V <b> 1 of the container 71 is connected to one end of the second heat exhaust pipe 27.

  Here, the bellows 31, the first exhaust heat pipe 22, the first intermediate pipe 25, the heat reception pipe 24, the second intermediate pipe 28, the second exhaust heat pipe 27, and the space V <b> 1 connected in this order are liquid or gaseous. State refrigerant is sealed. In FIG. 6, the portion in which the refrigerant is sealed is indicated by dots. Moreover, the bellows 31 expands and contracts periodically. According to the expansion and contraction operation of the bellows 31, the refrigerant in the piping system of the first exhaust heat pipe 22, the first intermediate pipe 25, the heat receiving pipe 24, the second intermediate pipe 28, and the second exhaust heat pipe 27 is periodically discharged. It can be reciprocated.

  First, in the process in which the bellows 31 is contracted and the process in which the space V1 is expanded, the bellows 31 pushes the refrigerant toward the first exhaust heat pipe 22, and the space V1 draws the refrigerant from the second exhaust heat pipe 27. That is, in the process in which the bellows 31 contracts and the process in which the space V1 expands, the refrigerant in the bellows 31 flows toward the first exhaust heat pipe 22, and the refrigerant in the first exhaust heat pipe 22 flows into the first intermediate pipe 25. The refrigerant in the first intermediate pipe 25 flows toward the heat receiving pipe 24, the refrigerant in the heat receiving pipe 24 flows toward the second intermediate pipe 28, and the refrigerant in the second intermediate pipe 28 passes through the second exhaust pipe. The refrigerant in the second exhaust heat pipe 27 flows toward the space V1.

  Second, in the process in which the bellows 31 is extended and the process in which the space V1 is contracted, the bellows 31 draws the refrigerant from the first exhaust heat pipe 22, and the space V1 pushes the refrigerant toward the second exhaust heat pipe 27. That is, in the process in which the bellows 31 extends and the process in which the space V1 contracts, the refrigerant in the space V1 flows toward the second exhaust heat pipe 27, and the refrigerant in the second exhaust heat pipe 27 flows into the second intermediate pipe 28. The refrigerant in the second intermediate pipe 28 flows toward the heat receiving pipe 24, the refrigerant in the heat receiving pipe 24 flows toward the first intermediate pipe 25, and the refrigerant in the first intermediate pipe 25 passes through the first exhaust pipe 24. The refrigerant flows toward the heat pipe 22, and the refrigerant in the first exhaust heat pipe 22 flows toward the bellows 31.

  In the heat exchanger formed by the exhaust heat section 21 and the first exhaust heat pipe 22 and the heat exchanger formed by the exhaust heat section 21 and the second exhaust heat pipe 27, the bellows 31 in the container 71 expands and contracts. Thus, heat exchange is performed between the refrigerant moving into the exhaust heat pipes 22 and 27 and the cooling stage 14a. Further, in the heat exchanger formed by the heat receiving portion 23 and the heat receiving pipe 24, heat exchange is performed between the refrigerant moving into the heat receiving pipe 24 by the expansion and contraction operation of the bellows 31 in the container 71 and the superconducting coil 15. Done.

  That is, by adopting a configuration like the heat transport device 20D, the heat generated by the increase in the number of intermediate pipes from one to two in addition to the effect of the heat transport device 20 by the same control as the heat transport device 20 shown in FIG. The transportation amount is doubled.

  Note that the superconducting magnet device 1D realizes downsizing of the device in a piping system equivalent to the piping system of the superconducting magnet device 1A (shown in FIG. 3) that consolidates the expansion / contraction control unit on the exhaust heat side. In the present invention, the apparatus may be reduced in size in a piping system equivalent to the piping system of the superconducting magnet device 1B (shown in FIG. 4) that consolidates the expansion / contraction control unit on the heat receiving side.

  Further, since the bellows 31 is usually thin, if a pressure difference occurs between the inside and outside of the bellows 31, the bellows 31 may be damaged due to insufficient strength. Therefore, in the superconducting magnet device 1D, the pressure resistance may be provided by the outer low-capacity thick tube without applying a pressure difference or a differential pressure enough to move the refrigerant inside and outside the bellows 31. According to such a configuration of the superconducting magnet device 1D, there is no fear of damaging the bellows 31 and the differential pressure is small, so that the bellows 31 can be expected to be thin and have a long life.

2. Operation The operation of the superconducting magnet device 1D will be described using the configuration of the superconducting magnet device 1D shown in FIG.

  The refrigerant in the exhaust heat pipes 22 and 27 of the superconducting magnet device 1D is cooled by the exhaust heat section 21 that is thermally connected to the cooling stage 14a. Further, the refrigerant in the heat receiving pipe 24 is warmed by cooling the heat receiving portion 23 that is thermally connected to the superconducting coil 15. When the bellows 31 in the container 71 is periodically expanded and contracted, the piping system of the first exhaust heat pipe 22, the first intermediate pipe 25, the heat receiving pipe 24, the second intermediate pipe 28, and the second exhaust heat pipe 27. The refrigerant inside is reciprocated.

  In the process of contracting the bellows 31 and the process of expanding the space V <b> 1, the refrigerant cooled in the first exhaust heat pipe 22 moves to the heat receiving pipe 24 through the first intermediate pipe 25 and in the heat receiving pipe 24. The warmed refrigerant moves to the second exhaust heat pipe 27 through the second intermediate pipe 28.

  The refrigerant that has moved to the heat receiving pipe 24 via the first intermediate pipe 25 is warmed by cooling the heat receiving portion 23 that is thermally connected to the superconducting coil 15, and the second refrigerant via the second intermediate pipe 28. The refrigerant that has moved to the exhaust heat pipe 27 is cooled by the exhaust heat section 21 that is thermally connected to the cooling stage 14a. That is, the superconducting coil 15 is cooled by the refrigerant that has moved to the heat receiving pipe 24 via the first intermediate pipe 25.

  In the process in which the bellows 31 continues to expand and the process in which the space V1 contracts, the refrigerant cooled in the second exhaust heat pipe 27 moves to the heat receiving pipe 24 via the second intermediate pipe 28 and in the heat receiving pipe 24. The refrigerant heated in step moves to the first exhaust heat pipe 22 through the first intermediate pipe 25.

  The refrigerant that has moved to the heat receiving pipe 24 via the second intermediate pipe 28 is warmed by cooling the heat receiving portion 23 that is thermally connected to the superconducting coil 15, and the first refrigerant via the first intermediate pipe 25. The refrigerant that has moved to the exhaust heat pipe 22 is cooled by the exhaust heat section 21 that is thermally connected to the cooling stage 14a. That is, the superconducting coil 15 is cooled by the refrigerant that has moved to the heat receiving pipe 24 via the second intermediate pipe 28.

  As described above, by the expansion and contraction operation of the bellows 31, the heat generated by the superconducting coil 15 can be steadily moved to the cooling stage 14a via the intermediate pipes 25 and 28.

3. Effect According to the superconducting magnet device 1D according to the fifth embodiment, a sufficiently small temperature difference between the superconducting coil 15 side and the refrigerator 14 side can be secured while suppressing the weight of the superconducting magnet device 1D. Further, according to the superconducting magnet device 1D, there is an advantage that the expansion / contraction control unit can be simplified and downsized as compared with the superconducting magnet device 1A shown in FIG. 3 and the superconducting magnet device 1B shown in FIG.

(Sixth embodiment)
1. Configuration FIG. 7 is a schematic diagram illustrating a configuration example of a superconducting magnet device according to a sixth embodiment.

  FIG. 7 shows a superconducting magnet device 1E according to the sixth embodiment. The superconducting magnet device 1E includes a vacuum vessel 11, a heat shield part 12, a shield support member 13, a refrigerator 14, a superconducting coil 15, a coil support body 16, and a heat transport device 20E.

  The heat transport device 20E is similar to the heat transport device 20A shown in FIG. 3 in that the exhaust heat section 21, the first exhaust heat pipe 22, the heat reception section 23, the heat reception pipe 24, the first intermediate pipe 25, and the second exhaust heat pipe 27. , And a second intermediate pipe 28.

  In addition, the heat transport device 20E includes an expansion / contraction control unit 26E.

  The expansion / contraction control unit 26E is connected to at least one of the exhaust heat pipe and the heat receiving pipe. Here, the expansion / contraction control unit 26 </ b> E is connected to the first exhaust heat pipe 22 and the second exhaust heat pipe 27.

  The expansion / contraction control unit 26 </ b> E includes a bellows 31 as an expansion / contraction part, a linear drive mechanism (bellows coil 32 and bellows permanent magnet 33) as a drive mechanism, a container 72, and a connection part 73. The bellows coil 32 and the bellows permanent magnet 33 of the drive mechanism of the expansion / contraction control unit 26E are provided in a cylindrical casing (not shown) outside the vacuum vessel 11 formed of a nonmagnetic material. The bellows 31 includes a movable bottom surface (a surface facing the connection surface with the first heat exhaust pipe 22) that is movable by an expansion / contraction operation, and a fixed bottom surface (a connection surface with the first heat exhaust pipe 22).

  The bellows coil 32 is disposed along the side surface of the cylindrical housing. The bellows permanent magnet 33 reciprocates the movable bottom surface of the bellows 31 (the lower surface of the bellows 31 shown in FIG. 7) with respect to the fixed bottom surface (the upper surface of the bellows 31 shown in FIG. 7) via the connecting portion 73. It is a needle | mover which can be reciprocated in the axial direction (vertical direction of FIG. 7) of a cylindrical housing | casing.

  The container 72 accommodates the bellows 31 inside the vacuum container 11. The connecting portion 73 connects the bellows permanent magnet 33 and the bellows 31 so as to expand and contract the bellows 31 according to the reciprocating motion of the bellows permanent magnet 33. The space V <b> 2 of the container 72 is connected to one end of the second heat exhaust pipe 27.

  The connection portion 73 is preferably made of a material such as stainless steel having a low thermal conductivity, and preferably has a minimum cross-sectional area that maintains the strength of the cross-sectional area. Since the connecting portion 73 made of stainless steel or the like is difficult to transfer the heat of the drive mechanism, the refrigerator 14 can be reduced in size and efficiency.

  The drive mechanism is provided outside the vacuum vessel 11. However, the drive mechanism may be provided inside the vacuum vessel 11 and outside the heat shield part 12. In that case, the heat generated by the drive mechanism may be cooled by the first cooling stage of the refrigerator 14. The drive mechanism is not limited to a linear drive mechanism. The drive mechanism may be a mechanism of another drive system such as a crank and gas pressure control.

  Here, the bellows 31, the first exhaust heat pipe 22, the first intermediate pipe 25, the heat reception pipe 24, the second intermediate pipe 28, the second exhaust heat pipe 27, and the space V <b> 2 connected in this order are liquid or gas. State refrigerant is sealed. In FIG. 7, the portion in which the refrigerant is sealed is indicated by dots. Moreover, the bellows 31 expands and contracts periodically. According to the expansion and contraction operation of the bellows 31, the refrigerant in the piping system of the first exhaust heat pipe 22, the first intermediate pipe 25, the heat receiving pipe 24, the second intermediate pipe 28, and the second exhaust heat pipe 27 is periodically discharged. It can be reciprocated.

  First, in the process in which the bellows 31 is contracted and the process in which the space V2 is expanded, the bellows 31 pushes the refrigerant toward the first exhaust heat pipe 22, and the space V2 draws the refrigerant from the second exhaust heat pipe 27. That is, in the process in which the bellows 31 contracts and the process in which the space V2 expands, the refrigerant in the bellows 31 flows toward the first exhaust heat pipe 22, and the refrigerant in the first exhaust heat pipe 22 flows into the first intermediate pipe 25. The refrigerant in the first intermediate pipe 25 flows toward the heat receiving pipe 24, the refrigerant in the heat receiving pipe 24 flows toward the second intermediate pipe 28, and the refrigerant in the second intermediate pipe 28 passes through the second exhaust pipe. It flows toward the heat pipe 27, and the refrigerant in the second exhaust heat pipe 27 flows toward the space V2.

  Secondly, in the process in which the bellows 31 is extended and the space V2 is contracted, the bellows 31 draws the refrigerant from the first exhaust heat pipe 22, and the space V2 pushes the refrigerant toward the second exhaust heat pipe 27. That is, in the process in which the bellows 31 extends and the process in which the space V2 contracts, the refrigerant in the space V2 flows toward the second exhaust heat pipe 27, and the refrigerant in the second exhaust heat pipe 27 flows into the second intermediate pipe 28. The refrigerant in the second intermediate pipe 28 flows toward the heat receiving pipe 24, the refrigerant in the heat receiving pipe 24 flows toward the first intermediate pipe 25, and the refrigerant in the first intermediate pipe 25 passes through the first exhaust pipe 24. The refrigerant flows toward the heat pipe 22, and the refrigerant in the first exhaust heat pipe 22 flows toward the bellows 31.

  In the heat exchanger formed by the exhaust heat section 21 and the first exhaust heat pipe 22 and the heat exchanger formed by the exhaust heat section 21 and the second exhaust heat pipe 27, the expansion and contraction operation of the bellows 31 in the container 72 is performed. Thus, heat exchange is performed between the refrigerant moving into the exhaust heat pipes 22 and 27 and the cooling stage 14a. Further, in the heat exchanger formed by the heat receiving portion 23 and the heat receiving pipe 24, heat exchange is performed between the refrigerant moving into the heat receiving pipe 24 and the superconducting coil 15 by the expansion and contraction operation of the bellows 31 in the container 72. Is called.

  That is, by adopting a configuration like the heat transport device 20E, the heat generated by the increase in the number of intermediate pipes from one to two in addition to the effect of the heat transport device 20 by the same control as the heat transport device 20 shown in FIG. The transportation amount is doubled.

  Note that the superconducting magnet device 1E realizes downsizing of the device in a piping system equivalent to the piping system of the superconducting magnet device 1A (shown in FIG. 3) that consolidates the expansion and contraction control unit on the exhaust heat side. In the present invention, the apparatus may be reduced in size in a piping system equivalent to the piping system of the superconducting magnet device 1B (shown in FIG. 4) that consolidates the refrigerant moving mechanism on the heat receiving side.

2. Operation The operation of the superconducting magnet device 1E will be described using the configuration of the superconducting magnet device 1E shown in FIG.

  The refrigerant in the exhaust heat pipes 22 and 27 of the superconducting magnet device 1E is cooled by the exhaust heat section 21 that is thermally connected to the cooling stage 14a. Further, the refrigerant in the heat receiving pipe 24 is warmed by cooling the heat receiving portion 23 that is thermally connected to the superconducting coil 15. When the bellows 31 in the container 72 is periodically expanded and contracted, the piping system of the first exhaust heat pipe 22, the first intermediate pipe 25, the heat receiving pipe 24, the second intermediate pipe 28, and the second exhaust heat pipe 27. The refrigerant inside is reciprocated.

  In the process of contracting the bellows 31 and the process of expanding the space V <b> 2, the refrigerant cooled in the first exhaust heat pipe 22 moves to the heat receiving pipe 24 through the first intermediate pipe 25 and in the heat receiving pipe 24. The warmed refrigerant moves to the second exhaust heat pipe 27 through the second intermediate pipe 28.

  The refrigerant that has moved to the heat receiving pipe 24 via the first intermediate pipe 25 is warmed by cooling the heat receiving portion 23 that is thermally connected to the superconducting coil 15, and the second refrigerant via the second intermediate pipe 28. The refrigerant that has moved to the exhaust heat pipe 27 is cooled by the exhaust heat section 21 that is thermally connected to the cooling stage 14a. That is, the superconducting coil 15 is cooled by the refrigerant that has moved to the heat receiving pipe 24 via the first intermediate pipe 25.

  In the process in which the bellows 31 continues to expand and the process in which the space V2 contracts, the refrigerant cooled in the second exhaust heat pipe 27 moves to the heat receiving pipe 24 via the second intermediate pipe 28 and in the heat receiving pipe 24. The refrigerant heated in step moves to the first exhaust heat pipe 22 through the first intermediate pipe 25.

  The refrigerant that has moved to the heat receiving pipe 24 via the second intermediate pipe 28 is warmed by cooling the heat receiving portion 23 that is thermally connected to the superconducting coil 15, and the first refrigerant via the first intermediate pipe 25. The refrigerant that has moved to the exhaust heat pipe 22 is cooled by the exhaust heat section 21 that is thermally connected to the cooling stage 14a. That is, the superconducting coil 15 is cooled by the refrigerant that has moved to the heat receiving pipe 24 via the second intermediate pipe 28.

  As described above, by the expansion and contraction operation of the bellows 31, the heat generated by the superconducting coil 15 can be steadily moved to the cooling stage 14a via the intermediate pipes 25 and 28.

3. Effect According to the superconducting magnet device 1E according to the sixth embodiment, a sufficiently small temperature difference between the superconducting coil 15 side and the refrigerator 14 side can be ensured while suppressing the weight of the superconducting magnet device 1E. Further, according to the superconducting magnet device 1E, heat conduction to the superconducting coil 15 corresponding to the heat generated by the drive mechanism can be reduced.

(Seventh embodiment)
1. Configuration FIG. 8 is a schematic diagram illustrating a configuration example of a superconducting magnet device according to a seventh embodiment.

  FIG. 8 shows a superconducting magnet device 1F according to the seventh embodiment. The superconducting magnet device 1F includes a vacuum vessel 11, a heat shield portion 12, a shield support member 13, a refrigerator 14, a superconducting coil 15, a coil support body 16, and a heat transport device 20F.

  Similarly to the heat transport device 20A shown in FIG. 3, the heat transport device 20F has a heat exhaust part 21, a first heat exhaust pipe 22, a heat receiver 23, a heat receiver pipe 24, a first intermediate pipe 25, and a second heat exhaust pipe 27. , And a second intermediate pipe 28.

  In addition, the heat transport device 20F includes an expansion / contraction control unit 26F.

  The expansion / contraction control unit 26F is connected to at least one of the exhaust heat pipe and the heat receiving pipe. Here, the expansion / contraction control unit 26 </ b> F is connected to the first exhaust heat pipe 22 and the second exhaust heat pipe 27.

  The expansion / contraction control unit 26 </ b> F includes a bellows 31 as an expansion / contraction part, a linear drive mechanism (bellows coil 32 and bellows permanent magnet 33) as a drive mechanism, a container 74, and a heat exchanger 75. The expansion / contraction part and the drive mechanism of the expansion / contraction control part 26F are provided in a cylindrical housing (not shown) formed of a nonmagnetic material. The bellows 31 includes a movable bottom surface (a surface facing the connection surface with the first heat exhaust pipe 22) that is movable by an expansion / contraction operation, and a fixed bottom surface (a connection surface with the first heat exhaust pipe 22).

  The bellows coil 32 is disposed along the side surface of the cylindrical housing. The bellows permanent magnet 33 is configured so that the movable bottom surface of the bellows 31 (the bottom surface of the bellows 31 shown in FIG. 8) reciprocates with respect to the fixed bottom surface (the top surface of the bellows 31 shown in FIG. 8). This is a mover that can reciprocate in the direction (vertical direction in FIG. 8).

  The container 74 is installed so that the space in which the bellows 31 expands and contracts and the space V3 that faces the bellows 31 with the bellows permanent magnet 33 interposed therebetween are partitioned by the bellows permanent magnet 33. A space V <b> 3 of the container 74 is connected to one end of the second heat exhaust pipe 27.

  The heat exchanger 75 performs heat exchange between the pipe connected to the first exhaust heat pipe 22 and the pipe connected to the second exhaust heat pipe 27.

  The drive mechanism is provided outside the vacuum vessel 11. However, the drive mechanism may be provided inside the vacuum vessel 11 and outside the heat shield part 12. In that case, the heat generated by the drive mechanism may be cooled by the first cooling stage of the refrigerator 14. The drive mechanism is not limited to a linear drive mechanism. The drive mechanism may be another reciprocating control mechanism such as a crank and gas pressure control.

  Here, in the bellows 31, the first exhaust heat pipe 22, the first intermediate pipe 25, the heat reception pipe 24, the second intermediate pipe 28, the second exhaust heat pipe 27, and the space V3 connected in order, a liquid or a gas is contained. State refrigerant is sealed. In FIG. 8, the portion in which the refrigerant is sealed is indicated by dots. Moreover, the bellows 31 expands and contracts periodically. According to the expansion and contraction operation of the bellows 31, the refrigerant in the piping system of the first exhaust heat pipe 22, the first intermediate pipe 25, the heat receiving pipe 24, the second intermediate pipe 28, and the second exhaust heat pipe 27 is periodically discharged. It can be reciprocated.

  First, in the process in which the bellows 31 contracts and the process in which the space V3 expands, the bellows 31 pushes out the refrigerant toward the first exhaust heat pipe 22, and the space V3 draws the refrigerant from the second exhaust heat pipe 27. That is, in the process in which the bellows 31 contracts and the process in which the space V3 expands, the refrigerant in the bellows 31 flows toward the first exhaust heat pipe 22 via the heat exchanger 75, and the refrigerant in the first exhaust heat pipe 22 Flows toward the first intermediate pipe 25, the refrigerant in the first intermediate pipe 25 flows toward the heat receiving pipe 24, the refrigerant in the heat receiving pipe 24 flows toward the second intermediate pipe 28, and the second intermediate pipe 28 The refrigerant in the refrigerant flows toward the second exhaust heat pipe 27, and the refrigerant in the second exhaust heat pipe 27 flows toward the space V3 via the heat exchanger 27.

  Secondly, in the process in which the bellows 31 is extended and the space V3 is contracted, the bellows 31 draws the refrigerant from the first exhaust heat pipe 22, and the space V3 pushes the refrigerant toward the second exhaust heat pipe 27. That is, in the process in which the bellows 31 is extended and the process in which the space V3 is contracted, the refrigerant in the space V3 flows toward the second exhaust heat pipe 27 via the heat exchanger 75, and the refrigerant in the second exhaust heat pipe 27 Flows toward the second intermediate pipe 28, the refrigerant in the second intermediate pipe 28 flows toward the heat receiving pipe 24, the refrigerant in the heat receiving pipe 24 flows toward the first intermediate pipe 25, and the first intermediate pipe 25. The refrigerant in the refrigerant flows toward the first exhaust heat pipe 22, and the refrigerant in the first exhaust heat pipe 22 flows toward the bellows 31 via the heat exchanger 75.

  In the heat exchanger formed by the exhaust heat section 21 and the first exhaust heat pipe 22 and the heat exchanger formed by the exhaust heat section 21 and the second exhaust heat pipe 27, the bellows 31 in the container 74 is expanded and contracted. Thus, heat exchange is performed between the refrigerant moving into the exhaust heat pipes 22 and 27 and the cooling stage 14a. Further, in the heat exchanger formed by the heat receiving portion 23 and the heat receiving pipe 24, heat exchange is performed between the refrigerant moving into the heat receiving pipe 24 and the superconducting coil 15 by the expansion and contraction operation of the bellows 31 in the container 74. Is called.

  In other words, by adopting a configuration such as the heat transport device 20F, in addition to the effect of the heat transport device 20, the heat generated by increasing the number of intermediate pipes from one to two by the same control as the heat transport device 20 shown in FIG. The transportation amount is doubled.

  Here, in the heat transport device 20F, heat exchange (heat transport) between the high cooling stage of the refrigerator 14 and the superconducting coil 15 is also possible by setting the amplitude of the gas vibration to be larger than the steady state. For example, the heat transport device 20F has a configuration in which heat exchange is performed between the piping between the exhaust heat pipes 22 and 27 and the expansion / contraction control unit 26F and a high cooling stage. In that case, the refrigeration capacity of the high-stage cooling stage can be effectively used for cooling the superconducting coil 15 under the condition that the temperature of the high-stage cooling stage and the superconducting coil 15 at the initial cooling is high.

  Note that the superconducting magnet device 1F realizes downsizing of the device in a piping system equivalent to the piping system of the superconducting magnet device 1A (shown in FIG. 3) that consolidates the expansion / contraction control unit on the exhaust heat side. In the present invention, the apparatus may be reduced in size in a piping system equivalent to the piping system of the superconducting magnet device 1B (shown in FIG. 4) that consolidates the expansion / contraction control unit on the heat receiving side.

2. Operation The operation of the superconducting magnet device 1F will be described using the configuration of the superconducting magnet device 1F shown in FIG.

  The refrigerant in the exhaust heat pipes 22 and 27 of the superconducting magnet device 1F is cooled by the exhaust heat section 21 that is thermally connected to the cooling stage 14a. Further, the refrigerant in the heat receiving pipe 24 is warmed by cooling the heat receiving portion 23 that is thermally connected to the superconducting coil 15. When the bellows 31 in the container 74 is periodically expanded and contracted, the piping system of the first exhaust heat pipe 22, the first intermediate pipe 25, the heat receiving pipe 24, the second intermediate pipe 28, and the second exhaust heat pipe 27. The refrigerant inside is reciprocated.

  In the process of contracting the bellows 31 and the process of expanding the space V <b> 3, the refrigerant cooled in the first exhaust heat pipe 22 moves to the heat receiving pipe 24 through the first intermediate pipe 25 and in the heat receiving pipe 24. The warmed refrigerant moves to the second exhaust heat pipe 27 through the second intermediate pipe 28.

  The refrigerant that has moved to the heat receiving pipe 24 via the first intermediate pipe 25 is warmed by cooling the heat receiving portion 23 that is thermally connected to the superconducting coil 15, and the second refrigerant via the second intermediate pipe 28. The refrigerant that has moved to the exhaust heat pipe 27 is cooled by the exhaust heat section 21 that is thermally connected to the cooling stage 14a. That is, the superconducting coil 15 is cooled by the refrigerant that has moved to the heat receiving pipe 24 via the first intermediate pipe 25.

  In the process in which the bellows 31 continues to expand and the process in which the space V3 contracts, the refrigerant cooled in the second exhaust heat pipe 27 moves to the heat receiving pipe 24 via the second intermediate pipe 28 and in the heat receiving pipe 24. The refrigerant heated in step moves to the first exhaust heat pipe 22 through the first intermediate pipe 25.

  The refrigerant that has moved to the heat receiving pipe 24 via the second intermediate pipe 28 is warmed by cooling the heat receiving portion 23 that is thermally connected to the superconducting coil 15, and the first refrigerant via the first intermediate pipe 25. The refrigerant that has moved to the exhaust heat pipe 22 is cooled by the exhaust heat section 21 that is thermally connected to the cooling stage 14a. That is, the superconducting coil 15 is cooled by the refrigerant that has moved to the heat receiving pipe 24 via the second intermediate pipe 28.

  As described above, by the expansion and contraction operation of the bellows 31, the heat generated by the superconducting coil 15 can be steadily moved to the cooling stage 14a via the intermediate pipes 25 and 28.

3. Effect According to the superconducting magnet device 1F according to the seventh embodiment, a sufficiently small temperature difference between the superconducting coil 15 side and the refrigerator 14 side can be ensured while suppressing the weight of the superconducting magnet device 1F. Moreover, according to the superconducting magnet device 1E, heat conduction to the superconducting coil 15 corresponding to the heat generated by the drive mechanism of the expansion / contraction control unit 26F can be reduced.

  Furthermore, according to the superconducting magnet device 1F, the maintainability of movable parts such as the drive mechanism of the expansion / contraction control part 26F is improved.

  According to at least one embodiment described above, it is possible to secure a sufficiently small temperature difference between the cooled object side and the refrigerator side while suppressing the weight of the apparatus.

  Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 10-10F ... Superconducting magnet apparatus, 14 ... Refrigerator, 15 ... Superconducting coil, 20-20F ... Heat transport apparatus, 21 ... Waste heat part, 22, 27 ... Waste heat piping, 23 ... Heat receiving part, 24, 29 ... Heat receiving part Piping, 25, 28 ... Medium piping, 26-26E ... Extension control unit, 31, 41, 51, 61 ... Bellows, 32, 42, 52, 62 ... Coil for bellows, 33, 43, 53, 63 ... Permanent for bellows Magnet, 71, 72, 74 ... container.

Claims (11)

A refrigerator,
An exhaust heat unit thermally connected to the refrigerator;
An exhaust heat pipe that is a pipe thermally connected to the exhaust heat section;
A superconducting coil;
A heat receiving portion thermally connected to the superconducting coil;
A heat receiving pipe which is a pipe thermally connected to the heat receiving section;
An intermediate pipe which is a pipe connecting one end of the exhaust heat pipe and one end of the heat receiving pipe;
An expansion / contraction part connected to at least one of the exhaust heat pipe and the heat receiving pipe, and having an expandable structure,
A drive mechanism for expanding and contracting the expansion and contraction part,
Refrigerant is enclosed in the exhaust heat pipe, the heat receiving pipe, the intermediate pipe, and the expansion / contraction part, and the expansion / contraction operation of the expansion / contraction part causes the exhaust heat pipe, the heat reception pipe, and the refrigerant in the intermediate pipe to cycle. Superconducting magnet device having a configuration that can be reciprocally moved. A first extension part as the extension part connected to the other end of the exhaust heat pipe;
A second stretchable portion as the stretchable portion connected to the other end of the heat receiving pipe and stretched with a predetermined phase difference from the first stretchable portion;
With
The superconducting magnet device according to claim 1, wherein the first expansion / contraction part, the exhaust heat pipe, the intermediate pipe, the heat receiving pipe, and the second expansion / contraction part are connected in order. A first exhaust heat pipe and a second exhaust heat pipe as the exhaust heat pipe;
A first intermediate pipe as the intermediate pipe that connects one end of the first exhaust heat pipe and one end of the heat receiving pipe;
A second intermediate pipe as the intermediate pipe connecting the one end of the second exhaust heat pipe and the other end of the heat receiving pipe;
A first expansion / contraction part as the expansion / contraction part connected to the other end of the first exhaust heat pipe;
A second expansion / contraction part as the expansion / contraction part connected to the other end of the second exhaust heat pipe and expanding / contracting with a predetermined phase difference from the first expansion / contraction part;
With
The said 1st expansion-contraction part, the said 1st exhaust heat piping, the said 1st intermediate | middle piping, the said heat receiving piping, the said 2nd intermediate | middle piping, the said 2nd exhaust heat piping, and the said 2nd expansion / contraction part were connected in order. The superconducting magnet device according to 1. A first heat receiving pipe and a second heat receiving pipe as the heat receiving pipe;
A first intermediate pipe as the intermediate pipe that connects one end of the first heat receiving pipe and one end of the exhaust heat pipe;
A second intermediate pipe as the intermediate pipe connecting the one end of the second heat receiving pipe and the other end of the exhaust heat pipe;
A first expansion / contraction part as the expansion / contraction part connected to the other end of the first heat receiving pipe;
A second expansion / contraction part as the expansion / contraction part connected to the other end of the second heat receiving pipe and expanding / contracting with a predetermined phase difference from the first expansion / contraction part;
With
The first extension part, the first heat receiving pipe, the first intermediate pipe, the exhaust heat pipe, the second intermediate pipe, the second heat reception pipe, and the second extension part are connected in order. The superconducting magnet device described.   The superconducting magnet device according to claim 3 or 4, wherein a plurality of drive mechanisms as the drive mechanism are configured to expand and contract each of the first expansion and contraction parts.   The superconducting magnet apparatus according to claim 3 or 4, wherein one drive mechanism as the drive mechanism is configured to expand and contract the first expansion and contraction part and the second expansion and contraction part. A first exhaust heat pipe and a second exhaust heat pipe as the exhaust heat pipe;
A first intermediate pipe as the intermediate pipe that connects one end of the first exhaust heat pipe and one end of the heat receiving pipe;
A second intermediate pipe as the intermediate pipe connecting the one end of the second exhaust heat pipe and the other end of the heat receiving pipe;
The telescopic part connected to the other end of the first exhaust heat pipe;
A container connected to the other end of the second exhaust heat pipe and enclosing the stretchable part;
With
The superconducting magnet according to claim 1, wherein the extension part, the first exhaust heat pipe, the first intermediate pipe, the heat receiving pipe, the second intermediate pipe, the second exhaust heat pipe, and the container are connected in order. apparatus. A first exhaust heat pipe and a second exhaust heat pipe as the exhaust heat pipe;
A first intermediate pipe as the intermediate pipe that connects one end of the first exhaust heat pipe and one end of the heat receiving pipe;
A second intermediate pipe as the intermediate pipe connecting the one end of the second exhaust heat pipe and the other end of the heat receiving pipe;
The telescopic part connected to the other end of the first exhaust heat pipe;
A container inside the heat shield part, which is connected to the other end of the second exhaust heat pipe and encloses the expansion and contraction part;
The drive mechanism outside the heat shield portion;
A connecting part for connecting the drive mechanism and the telescopic part;
With
The superconducting magnet according to claim 1, wherein the extension part, the first exhaust heat pipe, the first intermediate pipe, the heat receiving pipe, the second intermediate pipe, the second exhaust heat pipe, and the container are connected in order. apparatus. A first exhaust heat pipe and a second exhaust heat pipe as the exhaust heat pipe;
A first intermediate pipe as the intermediate pipe that connects one end of the first exhaust heat pipe and one end of the heat receiving pipe;
A second intermediate pipe as the intermediate pipe connecting the one end of the second exhaust heat pipe and the other end of the heat receiving pipe;
The telescopic part connected to the other end of the first exhaust heat pipe;
A container outside the heat shield part, which is connected to the other end of the second exhaust heat pipe and encloses the first stretchable part;
The drive mechanism outside the heat shield portion;
With
The superconducting magnet according to claim 1, wherein the extension part, the first exhaust heat pipe, the first intermediate pipe, the heat receiving pipe, the second intermediate pipe, the second exhaust heat pipe, and the container are connected in order. apparatus.   The superconducting magnet device according to any one of claims 1 to 9, wherein the exhaust heat pipe, the heat receiving pipe, and the intermediate pipe are made of stainless steel.   The superconducting magnet apparatus according to claim 10, wherein the heat receiving pipe is installed such that a height of the heat receiving pipe in the gravity direction is lower than a height of the cooling stage of the refrigerator in the gravity direction.

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