JP2017044372A - Recondensation device and nmr analyzer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recondensation device capable of effectively cooling a coating member, and to provide an NMR analyzer.SOLUTION: A recondensation device (20) comprises: a refrigerator (100) having a first cooling stage (110) and a second cooling stage (120); a second cooling part (200) having a shape that may be inserted into a neck tube (14) and configured to cool a helium gas; and a first cooling part (300) having a shape that may be inserted into the neck tube (14) and configured to thermally contact with an inner peripheral surface of the neck tube (14) to cool a cover member (15). The first cooling part (300) comprises: a cryogenic liquefied gas (310); a housing chamber (320) which houses the cryogenic liquefied gas (310); a connection part (330) which connects the housing chamber (320) with the first cooling stage (110); and an inner contact part (340) which causes the housing chamber (320) and the neck tube (14) to thermally contact with each other.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a superconducting magnet and a magnetic field generator having liquid helium for cooling the superconducting magnet, and recondensation that can be connected to the magnetic field generator and recondenses helium gas generated by vaporization of liquid helium. And an NMR analyzer equipped with the apparatus.

  2. Description of the Related Art Conventionally, an NMR analyzer that analyzes a subject using a static magnetic field generated by a superconducting magnet is known. For example, Patent Literature 1 discloses an NMR analyzer including a magnetic field generation unit and a recondensing device that can be connected to the magnetic field generation unit.

  The magnetic field generation unit has a shape that covers the superconducting magnet and a liquid helium tank that stores liquid helium for cooling the superconducting magnet, a neck tube protruding upward from the liquid helium tank, and the liquid helium tank from the outside. It has a covering member (heat shield) and a vacuum vessel that houses the liquid helium tank and the covering member. The upper end portion of the covering member is connected to the outer peripheral surface of the neck tube.

  The recondensing device is a device for recondensing helium gas generated by vaporization of liquid helium. The recondensing apparatus includes a refrigerator having a first cooling stage and a second cooling stage having a temperature lower than the temperature of the first cooling stage, a second cooling unit connected to the second cooling stage, and a first cooling It has the 1st cooling part connected to the stage, and the inner side contact part connected to the 1st cooling part. The second cooling unit is formed in a shape that can be inserted into the neck tube, and cools helium gas generated by vaporization of liquid helium in the liquid helium tank. The first cooling part is formed in a shape that covers the second cooling part and can be inserted into the neck tube. The inner contact portion is fixed to the outer peripheral surface of the first cooling portion, and is in thermal contact with the inner peripheral surface of the neck tube from the inner side. The first cooling section and the second cooling section are inserted into the neck tube so that the inner contact portion contacts a portion of the neck tube in the vicinity of the inner surface of the connection portion between the neck tube and the upper end portion of the covering member. . For this reason, the covering member is cooled by the first cooling stage via the inner contact portion and the first cooling portion. Therefore, heat can be prevented from entering the liquid helium tank from the outside through the vacuum vessel.

JP 2012-2411 A

  In the recondensing device described in Patent Document 1, there is a limit to the cooling of the covering member by the first cooling stage. Specifically, since the first cooling stage and the inner contact portion are connected via the first cooling portion, the material for forming the first cooling portion has a high thermal conductivity such as copper or aluminum. Even if is selected, there is a limit to cooling the covering member. In other words, in the structure as described in Patent Document 1, there is a cooling limit due to the thermal conductivity of the first cooling unit.

  The objective of this invention is providing the recondensing apparatus and NMR analyzer which can cool a coating | coated member effectively.

  As means for solving the above problems, the present invention provides a superconducting magnet, a liquid helium tank for storing liquid helium for cooling the superconducting magnet, a neck tube protruding upward from the liquid helium tank, and the liquid A helium tank having a shape that covers from the outside, and at least one covering member that has an outer contact portion that is in thermal contact with the outer peripheral surface of the neck tube. A recondensing device for recondensing helium gas generated by vaporization of helium, the refrigerator having a first cooling stage and a second cooling stage that can be lower in temperature than the first cooling stage; A second cooling section connected to the second cooling stage and inserted into the neck tube, for cooling the helium gas; and the first cooling section. A first cooling part connected to the step and having a shape that can be inserted into the neck tube, and cooling the covering member by being in thermal contact with the inner peripheral surface of the neck tube; The first cooling unit includes a low-temperature liquefied gas, a shape that can be inserted into the neck tube, a storage chamber that stores the low-temperature liquefied gas, the storage chamber, and the first cooling stage. A recondensing apparatus comprising: a connecting portion to be connected; and an inner contact portion that thermally contacts the receiving chamber and the neck tube by being interposed between the receiving chamber and the inner peripheral surface of the neck tube. I will provide a.

  In this recondensing device, the covering member is cooled via the inner contact portion and the neck tube by the vaporization heat of the low-temperature liquefied gas accommodated in the accommodating chamber, so that the conventional limitation (first cooling stage and inner contact) The covering member can be effectively cooled without being subjected to the limitation of cooling due to the thermal conductivity of the member connecting the parts. The gas generated by the vaporization of the low-temperature liquefied gas is condensed by being cooled in the first cooling stage after ascending in the connecting portion, and dropped again into the storage chamber. That is, in this recondensing device, effective cooling of the covering member is achieved by constructing a heat pipe between the first cooling stage and the inner contact portion.

  Specifically, the connecting portion has a shape for accommodating the first cooling stage, and a low-temperature liquefied gas recondensing chamber for recondensing gas generated by vaporization of the low-temperature liquefied gas, A plurality of liquid phase tubes that connect the storage chamber and the low-temperature liquefied gas recondensing chamber, and guide the low-temperature liquefied gas generated by the condensation of the gas in the low-temperature liquefied gas recondensing chamber to the storage chamber; A plurality of gas phase pipes each connecting the storage chamber and the low-temperature liquefied gas recondensing chamber, and guiding the gas generated by vaporization of the low-temperature liquefied gas in the storage chamber to the low-temperature liquefied gas recondensing chamber; It is preferable to contain.

  By doing so, the flow path of the low-temperature liquefied gas and the flow path of the gas are separated from each other, so that the total amount of heat that moves through each pipe increases.

  In this case, the low-temperature liquefied gas recondensing chamber has a receiving portion for receiving the low-temperature liquefied gas generated by the condensation of the gas, and each liquid phase tube has an upper end of the liquid phase tube and an upper surface of the receiving portion. It is connected to the receiving portion in a posture that is flush with the upper end of the liquid tube or in an posture that is located below the upper surface of the receiving portion. It is preferable to be connected to the receiving portion in an attitude located above the upper surface of the receiving portion.

  In this way, the low-temperature liquefied gas generated by the condensation of the gas in the low-temperature liquefied gas recondensing chamber flows smoothly into each liquid phase tube via the upper surface of the receiving portion, while each gas from the upper surface of the receiving portion. Inflow into the phase tube is suppressed. That is, the inhibition of the gas rise in each gas phase tube by the low temperature liquefied gas generated in the low temperature liquefied gas recondensing chamber is suppressed. Therefore, the total amount of heat that moves through each tube further increases.

  Moreover, in this invention, it is preferable that each liquid phase tube and each gas phase tube are arrange | positioned so that the circumference | surroundings of the said 2nd cooling part may be enclosed.

  If it does in this way, since each liquid phase pipe and each gas phase pipe suppress heat penetration to the 2nd cooling part from the outside, helium gas condenses effectively in the 2nd cooling part.

  Moreover, in this invention, it is preferable that the said connection part has a vibration absorption part which absorbs the vibration transmitted toward the said storage chamber from the said refrigerator.

  In this way, since the vibration generated in the refrigerator is suppressed from being transmitted to the neck tube, the influence of the vibration on the static magnetic field formed by the magnetic field generation unit, that is, the decrease in analysis accuracy is suppressed.

  Moreover, in this invention, it is preferable to further provide the 1st space formation member which forms the 1st space which can be evacuated outside the said 1st cooling stage and the said 1st cooling part.

  If it does in this way, the heat | fever penetration | invasion to the 1st cooling part from the outside will be suppressed by making 1st space into a vacuum.

  Moreover, in this invention, it is preferable to further provide the 2nd space formation member which forms the 2nd space which can be evacuated between the said 1st cooling part and the said 2nd cooling part.

  If it does in this way, the heat | fever penetration | invasion to the 2nd cooling part from the outside will be suppressed by making 2nd space into a vacuum.

  In the present invention, the first space forming member has a discharge port capable of discharging the gas in the first space, and the second space forming member includes the first space, the second space, and the second space. It is preferable to have a communication port that allows communication.

  In this way, both the first space and the second space can be evacuated by discharging the gas in the first space through the discharge port.

  Moreover, this invention is an NMR analyzer provided with the said recondensing apparatus and the said magnetic field generating part, Comprising: The said inner side contact part of the said recondensing apparatus is connected to the internal peripheral surface of the said neck tube. An NMR analyzer is provided.

  In this NMR analyzer, the covering member is effectively cooled via the inner contact portion and the neck tube by the heat of vaporization of the low-temperature liquefied gas stored in the storage chamber. Therefore, heat penetration from the outside into the liquid helium tank is effectively suppressed.

  As described above, according to the present invention, it is possible to provide a recondensing device and an NMR analyzer that can effectively cool the covering member.

It is a figure which shows the outline of a structure of the NMR analyzer of one Embodiment of this invention. It is sectional drawing of a recondensing apparatus. It is sectional drawing in the III-III line of FIG. It is sectional drawing in the IV-IV line of FIG. It is sectional drawing in the VV line of FIG. It is sectional drawing in the VI-VI line of FIG.

  An NMR analyzer 1 according to an embodiment of the present invention will be described with reference to FIGS. The NMR analyzer 1 is an apparatus for analyzing a subject (not shown) arranged in a static magnetic field by a superconducting magnet 11.

  As shown in FIG. 1, the NMR analyzer 1 includes a magnetic field generator 10 and a recondensing device 20. Hereinafter, the magnetic field generator 10 and the recondensing device 20 will be described in this order.

  The magnetic field generation unit 10 includes an annular superconducting magnet 11, a liquid helium 12 that cools the superconducting magnet 11, a liquid helium tank 13 that accommodates the superconducting magnet 11 and the liquid helium 12, a neck tube 14, and a coating. A member 15 and a vacuum container 16 are provided.

  The liquid helium tank 13 is formed in an annular shape according to the shape of the superconducting magnet 11. The liquid helium tank 13 is formed of stainless steel or the like.

  The neck tube 14 has a shape extending upward from the upper surface of the liquid helium tank 13. The neck tube 14 is formed in a cylindrical shape.

  The covering member 15 is a member for suppressing heat penetration into the liquid helium tank 13 from the outside. The covering member 15 has a shape that covers the liquid helium tank 13 from the outside. In the present embodiment, the covering member 15 includes a first heat shield 15A having a shape covering the liquid helium tank 13, and a second heat shield 15B having a shape covering the first heat shield 15A. The upper ends of the heat shields 15 </ b> A and 15 </ b> B are connected to the outer peripheral surface of the neck tube 14. Each heat shield 15A, 15B is formed of aluminum.

  The vacuum container 16 has a shape that accommodates the liquid helium tank 13, the neck tube 14, and the covering member 15. The vacuum container 16 is formed in an annular shape in accordance with the shape of the liquid helium tank 13. The neck tube 14 passes through the vacuum vessel 16 and opens upward.

  Next, the recondensing device 20 will be described with reference to FIGS. The recondensing device 20 is a device that recondenses the helium gas generated by the vaporization of the liquid helium 12, and is a device that can be detachably connected to the magnetic field generation unit 10. Specifically, the recondensing device 20 includes a refrigerator 100, a second cooling unit 200, a first cooling unit 300, a first space forming member 400, and a second space forming member 500.

  The refrigerator 100 is connected to the driving unit 102, the first cooling stage 110 connected to the driving unit 102, and the first cooling stage 110, and can be lower than the temperature of the first cooling stage 110. A second cooling stage 120. That is, the refrigerator 100 is a two-stage cryogenic refrigerator. In the refrigerator 100, when the driving unit 102 is driven, the temperature of the first cooling stage 110 is 30K to 60K, and the temperature of the second cooling stage 120 is 4.2K. The first cooling stage 110 has first fins 112, and the second cooling stage 120 has second fins 122. Each fin 112, 122 is made of, for example, copper.

  The second cooling unit 200 is connected to the second cooling stage 120 and is a part that cools the helium gas generated by the vaporization of the liquid helium in the liquid helium tank 13. The second cooling unit 200 includes a helium gas recondensing chamber 210 for recondensing helium gas, and a helium channel 220 having a shape that can be inserted into the neck tube 14.

  The helium gas recondensing chamber 210 is formed in a cylindrical shape surrounding the second fin 122 of the second cooling stage 120. The helium gas recondensing chamber 210 is made of, for example, stainless steel.

  The helium channel 220 is a channel for flowing helium gas and liquid helium, and is connected to the helium gas recondensing chamber 210. In the present embodiment, the separation unit 222 is disposed in the helium channel 220. The separation unit 222 has a shape that separates the helium flow path 220 into a gas flow path that raises helium gas and a liquid flow path that causes liquid helium to flow down. As shown in FIG. 2, the helium gas that has risen between the helium flow path 220 and the separation unit 222 is condensed by being cooled by the second fins 122, and the liquid helium 12 generated by the condensation is separated. It flows down in the part 222.

  The first cooling unit 300 is connected to the first cooling stage 110 and is a part that cools the covering member 15 by being in thermal contact with the inner peripheral surface of the neck tube 14. The first cooling unit 300 constitutes a heat pipe. Specifically, the first cooling unit 300 includes a low-temperature liquefied gas 310 that serves as a medium for transferring heat, a storage chamber 320 that stores the low-temperature liquefied gas 310, and a connection that connects the storage chamber 320 and the first cooling stage 110. Part 330, and inner contact part 340 that thermally contacts storage chamber 320 and the inner peripheral surface of neck tube 14. In the present embodiment, liquid nitrogen is used as the low temperature liquefied gas 310.

  The storage chamber 320 has a shape that can be inserted into the neck tube 14. Specifically, the storage chamber 320 is formed in an annular shape having an outer diameter smaller than the inner diameter of the neck tube 14. The storage chamber 320 is disposed around the helium flow path 220 of the second cooling unit 200.

  The connecting part 330 is a part that circulates nitrogen between the storage chamber 320 and the first cooling stage 110. The connection unit 330 includes a low-temperature liquefied gas recondensing chamber 332, a plurality of liquid phase tubes 334, and a plurality of gas phase tubes 336.

  The low-temperature liquefied gas recondensing chamber 332 has a shape that accommodates the first fins 112 of the first cooling stage 110. The low-temperature liquefied gas recondensing chamber 332 is formed in an annular shape surrounding the second cooling stage 120. The gas (nitrogen gas) generated by the vaporization of the low temperature liquefied gas 310 is recondensed by being cooled by the first fins 112 in the low temperature liquefied gas recondensing chamber 332. The low-temperature liquefied gas recondensing chamber 332 has a receiving portion 333 that receives liquid nitrogen generated by recondensing nitrogen gas.

  Each liquid phase tube 334 connects the storage chamber 320 and the low-temperature liquefied gas recondensing chamber 332. The liquid phase tube 334 is a flow path that guides liquid nitrogen generated by the condensation of nitrogen gas in the low-temperature liquefied gas recondensing chamber 332 to the storage chamber 320. The upper end portion of each liquid phase tube 334 is connected to the receiving portion 333. Each liquid phase tube 334 is preferably set to a length from the receiving portion 333 to the bottom surface of the storage chamber 320. Each liquid phase tube 334 also has a function as a vibration absorbing portion that absorbs vibration transmitted from the refrigerator 100 toward the storage chamber 320. Each liquid phase tube 334 is made of, for example, copper that has been annealed.

  Each gas phase pipe 336 connects the storage chamber 320 and the low-temperature liquefied gas recondensing chamber 332. The gas phase pipe 336 is a flow path that guides nitrogen gas generated by vaporization of liquid nitrogen in the storage chamber 320 to the low-temperature liquefied gas recondensing chamber 332. The upper end portion of each gas phase tube 336 is connected to the receiving portion 333. The lower end (not shown) of each gas phase tube 336 is connected to the upper end of the storage chamber 320. The inner diameter of each gas phase tube 336 is set larger than the inner diameter of each liquid phase tube 334. Each gas phase pipe 336 also has a function as a vibration absorbing portion that absorbs vibration transmitted from the refrigerator 100 toward the storage chamber 320. Each gas phase tube 336 is formed of, for example, copper that has been subjected to annealing treatment.

  As shown in FIG. 5, the tubes 334 and 336 are arranged so as to cover the second cooling unit 200, that is, arranged along the circumferential direction. In the present embodiment, four liquid phase tubes 334 are arranged so as to be arranged at intervals of 90 degrees along the circumferential direction, and between the liquid phase tubes 334 adjacent to each other in the circumferential direction, Five gas phase pipes 336 are arranged in a line.

  As shown in FIG. 6, in the present embodiment, each liquid phase tube 334 is connected to the receiving portion 333 in such a posture that the upper end of the liquid phase tube 334 is flush with the upper surface of the receiving portion 333. However, the upper end of each liquid phase tube 334 may be positioned below the upper surface of the receiving portion 333. Each liquid phase tube 336 is connected to the receiving portion 333 in such a posture that the upper end of the liquid phase tube 336 is positioned above the upper surface of the receiving portion 333.

  The inner contact portion 340 is fixed to the outer peripheral surface of the storage chamber 320. As shown in FIG. 2, the inner contact portion 340 is connected to a portion of the neck tube 14 inside the connection portion between the neck tube 14 and the covering member 15. For this reason, the covering member 15 is cooled by the liquid nitrogen in the storage chamber 320 via the neck tube 14 and the inner contact portion 340. More specifically, the liquid nitrogen in the storage chamber 320 cools the covering member 15 by absorbing the amount of heat received from the covering member 15 with latent heat of vaporization. In the present embodiment, as shown in FIG. 3, the inner contact portion 340 is divided into a plurality in the circumferential direction. The inner contact portion 340 is made of beryllium copper, for example.

  The first cooling unit 300 further includes a heat insulating layer 350. As shown in FIGS. 2 and 5, the heat insulating layer 350 has a shape that covers the periphery of the low-temperature liquefied gas recondensing chamber 332 and the vibration absorbing portions 335 and 337. The heat insulating layer 350 is formed by, for example, super insulation.

  In the present embodiment, a first space forming member 400 that forms a first space S1 that can be evacuated to the outside of the first cooling stage 110, the tubes 334, 336, and the heat insulating layer 350, and the first cooling unit. A second space forming member 500 that forms a second space S <b> 2 that can be evacuated between 300 and the second cooling unit 200 is further provided.

  The first space forming member 400 has a shape that covers the periphery of the first cooling stage 110, the tubes 334 and 336, and the heat insulating layer 350. The upper end portion of the first space forming member 400 is continuously connected to the drive unit 102 over the entire circumferential direction, and the lower end portion of the first space forming member 400 is connected to the outer circumferential surface of the storage chamber 320 in the circumferential direction. Connected continuously over. The first space forming member 400 is made of, for example, stainless steel. The first space forming member 400 includes a discharge port 412 that can discharge the gas in the first space S <b> 1, and a vibration absorption unit 414 that absorbs vibration transmitted from the drive unit 102 toward the storage chamber 320. .

  The second space forming member 500 has a shape that connects the lower surface of the storage chamber 320 and the outer peripheral surface of the helium channel 220 over the entire region in the circumferential direction.

  Further, the first space S1 and the second space S2 communicate with each other through a gap formed in the heat insulating layer 350.

  As described above, in the recondensing device 20, the covering member 15 is cooled by the heat of vaporization of liquid nitrogen stored in the storage chamber 320 through the inner contact portion 340 and the neck tube 14. The covering member 15 can be effectively cooled without being subjected to any restriction (restriction of cooling due to the thermal conductivity of the material forming the member connecting the first cooling stage and the inner contact portion). The nitrogen gas generated by the vaporization of liquid nitrogen is condensed by being cooled in the first cooling stage 110 after rising in each gas phase tube 336 and dropped again into the storage chamber 320 through each liquid phase tube 334. . That is, in the recondensing device 20, effective cooling of the covering member 15 is achieved by constructing a heat pipe between the first cooling stage 110 and the inner contact portion 340.

  Further, since the connecting portion 330 has a plurality of liquid phase tubes 334 and a plurality of gas phase tubes 336, the liquid nitrogen channel and the nitrogen gas channel are separated from each other. For this reason, the total heat quantity which moves each pipe | tube 334,336 increases.

  Furthermore, the upper end of each liquid phase tube 334 is flush with the upper surface of the receiving portion 333, and the upper end of each gas phase tube 336 is located above the upper surface of the receiving portion 333, so The liquid nitrogen generated by the condensation of nitrogen gas in the gas recondensing chamber 332 smoothly flows into the respective liquid phase tubes 334 via the upper surface of the receiving portion 333, while the respective vapor phase tubes 336 from the upper surface of the receiving portion 333. It is suppressed that it flows into. That is, the inhibition of the increase of the nitrogen gas in each gas phase pipe 336 due to the liquid nitrogen generated in the low temperature liquefied gas recondensing chamber 332 is suppressed. Therefore, the total amount of heat that moves through the tubes 334 and 336 further increases.

  In addition, since each liquid phase pipe 334 and each gas phase pipe 336 are arranged so as to surround the second cooling unit 200, heat intrusion from the outside to the second cooling unit 200 is caused by the respective pipes 334, 336. It is suppressed. Therefore, helium gas is effectively condensed in the second cooling unit 200.

  Each of the tubes 334 and 336 functions as a vibration absorbing portion, and the vibration absorbing portion 414 is formed in the first space forming member 400, so that vibration generated in the refrigerator 100 is transmitted to the neck tube 14. Is suppressed. Therefore, the influence of the vibration on the static magnetic field formed by the magnetic field generation unit 10, that is, a decrease in analysis accuracy is suppressed.

  Moreover, since the said recondensing apparatus 20 has 1st space S1 and 2nd space S2, when these space S1, S2 is evacuated, it is from the exterior to the 1st cooling part 300 and the 2nd cooling part 200. Intrusion of heat is suppressed.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, liquid neon or liquid argon may be used as the low temperature liquefied gas 310.

DESCRIPTION OF SYMBOLS 1 NMR analyzer 10 Magnetic field generation part 11 Superconducting magnet 12 Liquid helium 13 Liquid helium tank 14 Neck tube 15 Cover member 16 Vacuum container 20 Recondensing apparatus 100 Refrigerator 110 1st cooling stage 120 2nd cooling stage 200 2nd cooling part 300 First Cooling Unit 310 Low Temperature Liquefied Gas 320 Storage Chamber 330 Connecting Portion 332 Low Temperature Liquefied Gas Recondensing Chamber 333 Receiving Portion 334 Liquid Phase Tube (Vibration Absorbing Portion)
336 Gas phase tube (vibration absorber)
340 Inner contact portion 400 First space forming member 412 Discharge port 416 Communication port 500 Second space forming member S1 First space S2 Second space

Claims (9)

A liquid helium tank for storing a superconducting magnet and liquid helium for cooling the superconducting magnet, a neck tube protruding upward from the liquid helium tank, and a shape covering the liquid helium tank from the outside and the neck A helium gas generated by vaporization of the liquid helium, and is connectable to a magnetic field generator including at least one covering member having an outer contact portion that is in thermal contact with the outer peripheral surface of the tube. A recondensing device,
A refrigerator having a first cooling stage and a second cooling stage capable of being cooler than the temperature of the first cooling stage;
A second cooling part connected to the second cooling stage and having a shape that can be inserted into the neck tube, and cooling the helium gas;
The first cooling stage is connected to the first cooling stage and has a shape that can be inserted into the neck tube, and cools the covering member by being in thermal contact with the inner peripheral surface of the neck tube. A cooling unit,
The first cooling unit includes:
Low temperature liquefied gas,
While having a shape that can be inserted into the neck tube, a storage chamber for storing the low-temperature liquefied gas,
A connecting portion connecting the storage chamber and the first cooling stage;
A recondensing device comprising: an inner contact portion that thermally contacts the storage chamber and the neck tube by being interposed between the storage chamber and the inner peripheral surface of the neck tube. The recondensing device according to claim 1,
The connecting portion is
A low-temperature liquefied gas recondensing chamber for recondensing the gas generated by vaporization of the low-temperature liquefied gas, having a shape for accommodating the first cooling stage;
A plurality of liquid phase tubes each connecting the storage chamber and the low-temperature liquefied gas recondensing chamber, and guiding the low-temperature liquefied gas generated by the condensation of the gas in the low-temperature liquefied gas recondensing chamber to the storage chamber When,
A plurality of gas phase pipes each connecting the storage chamber and the low-temperature liquefied gas recondensing chamber, and guiding the gas generated by vaporization of the low-temperature liquefied gas in the storage chamber to the low-temperature liquefied gas recondensing chamber; A recondensing device. The recondensing device according to claim 2,
The low-temperature liquefied gas recondensing chamber has a receiving portion for receiving a low-temperature liquefied gas generated by the condensation of the gas,
Each liquid phase tube has a posture in which the upper end of the liquid phase tube is flush with the upper surface of the receiving portion, or an upper end of the liquid tube is positioned below the upper surface of the receiving portion. Connected,
Each vapor phase tube is a recondensing device, wherein the vapor phase tube is connected to the receiving portion in a posture in which the upper end of the vapor phase tube is positioned above the upper surface of the receiving portion. The recondensing device according to claim 2 or 3,
Each liquid phase pipe | tube and each gas phase pipe | tube are recondensing apparatuses arrange | positioned so that the circumference | surroundings of the said 2nd cooling part may be enclosed. The recondensing device according to any one of claims 1 to 4,
The said connection part is a recondensing apparatus which has the function as a vibration absorption part which absorbs the vibration transmitted toward the said storage chamber from the said refrigerator. The recondensing device according to any one of claims 1 to 5,
The recondensing apparatus further comprising a first space forming member that forms a first space that can be evacuated outside the first cooling stage and the first cooling unit. Recondensing device according to claim 6,
The recondensing apparatus further comprising a second space forming member that forms a second space that can be evacuated between the first cooling unit and the second cooling unit. Recondensing device according to claim 7,
The first space forming member has a discharge port capable of discharging the gas in the first space,
The recondensing device, wherein the first space and the second space communicate with each other. Recondensing device according to any of claims 1 to 8,
An NMR analyzer comprising the magnetic field generator,
The NMR analysis device, wherein the inner contact portion of the recondensing device is connected to an inner peripheral surface of the neck tube.

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