JPWO2019073573A1 - Superconducting electromagnet device - Google Patents

Abstract

Provided is a superconducting electromagnet device that can be configured so that heat does not easily flow into a refrigerant container (6) without complicating a cooling mechanism. The superconducting electromagnet device according to the present invention includes a superconducting coil (60), a refrigerant container (6), a vacuum container (4) for storing the refrigerant container (6), and a refrigerant vaporized inside the refrigerant container (6). An exhaust pipe (7) for exhausting (30) to the outside of the vacuum vessel (4), and a refrigerator inserted into the vacuum vessel (4) from a position distant from the exhaust pipe (7) to cool the refrigerant (9) and a refrigerator connection pipe (10), and one of the exhaust pipe (7) and the refrigerator connection pipe (10) is connected to the refrigerant container (6) through the opening (6a). The other pipe is connected to a pipe whose end is inserted into the inside of one pipe from a through hole (17) provided in the middle of the one pipe and protrudes into the inside of one pipe. It has a protrusion (19).

Description

  The present invention relates to a superconducting electromagnet device, and more particularly to a superconducting electromagnet device including a superconducting coil that is cooled by being immersed in a coolant.

  In the superconducting electromagnet apparatus, the electric resistance of the superconducting coil is reduced to zero by cooling the superconducting coil using a liquefied refrigerant such as liquefied helium. With such a configuration, when the superconducting coil is energized, a large current can be caused to flow on the superconducting coil to generate a strong magnetic field.

  As a general configuration for maintaining the superconducting coil at the liquefied helium temperature, the superconducting electromagnet device includes a superconducting coil, a refrigerant container containing the superconducting coil, and a vacuum container containing the refrigerant container and having a high vacuum inside. A refrigerator that discharges heat flowing into the refrigerant container to the outside of the refrigerant container, a refrigerator connection pipe connected to the refrigerator and the refrigerant container, and an exhaust pipe connected to the refrigerant container and the vacuum container. I have.

  In a superconducting electromagnet device, it is generally desirable to suppress the amount of heat flowing into the refrigerant container as much as possible. This is because, if the amount of heat flowing into the refrigerant container increases, quench may occur and damage containers such as a vacuum container and a refrigerant container. Note that quench is a phenomenon in which helium gas generated by evaporation of liquefied helium in a refrigerant container increases, and the pressure and temperature in the refrigerant container significantly increase.

  In the general superconducting electromagnet apparatus described above, the exhaust pipe and the refrigerator connection pipe (hereinafter sometimes referred to as “both pipes”) are both connected to the refrigerant container, and both the pipes are inside the refrigerant container. This is a path through which heat flows (hereinafter, may be referred to as a “heat inflow path”).

  Therefore, as a technique for reducing the heat flowing into the refrigerant container through both the pipes, for example, in Patent Document 1, a connection box to which both the pipes are connected is provided, and the connection box is connected to the opening of the refrigerant container. And In such a configuration, the amount of heat flowing into the refrigerant container can be reduced by limiting the direct heat flow path into the refrigerant container to the connection box.

International Publication No. 2008/032117

  In the invention described in Patent Document 1, heat from both pipes flows into the connection box. Therefore, heat flows into the refrigerant container from the connection box. In Patent Document 1, in order to suppress such heat inflow, a liquefied refrigerant is stored in a connection box, and the connection box is cooled by the liquefied refrigerant. As described above, in the superconducting electromagnet apparatus of Patent Document 1, in order to make the structure that the heat does not easily flow into the refrigerant container, it is necessary to store the liquefied refrigerant in the connection box in addition to the refrigerant container. However, there has been a problem that the cooling mechanism of the superconducting electromagnet device becomes complicated.

  The present invention has been made in view of the above circumstances, and provides a superconducting electromagnet device in which heat does not easily flow into a refrigerant container without complicating the cooling mechanism of the superconducting electromagnet device. Aim.

  The superconducting electromagnet device according to the present invention is a superconducting coil, a superconducting coil is housed in a state where the superconducting coil is immersed in a liquid refrigerant, a refrigerant container provided with an opening, a vacuum container storing the refrigerant container, and a refrigerant container. An exhaust pipe for exhausting the refrigerant vaporized inside to the outside of the vacuum vessel, a refrigerator inserted into the vacuum vessel from a position away from the exhaust pipe to cool the refrigerant, and a refrigerant inside the refrigerant vessel. A refrigerator connection pipe for flowing through the refrigerator, and one of the exhaust pipe and the refrigerator connection pipe is connected to the refrigerant container through an opening, and the other pipe is an end of the other pipe. Has a pipe projecting portion that is inserted into the inside of one of the pipes through a through hole provided in the middle of the one of the pipes and projects into the inside of the one of the pipes.

  In the superconducting electromagnet apparatus according to the present invention, it is possible to adopt a configuration in which heat does not easily flow into the refrigerant container without complicating the cooling mechanism of the superconducting electromagnet apparatus.

1 is a perspective view of a superconducting electromagnet device according to Embodiment 1 of the present invention. It is a front view and a side view of the superconducting electromagnet device according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view of the superconducting electromagnet device according to Embodiment 1 of the present invention at a cross-sectional position X1-X2 shown in FIG. FIG. 3 is an explanatory diagram illustrating heat exchange performed between a helium gas and an exhaust pipe according to Embodiment 1 of the present invention. FIG. 4 is a cross-sectional view of the superconducting electromagnet device according to Embodiment 2 of the present invention at a cross-sectional position X1-X2 shown in FIG. FIG. 6 is a cross-sectional view of the superconducting electromagnet device according to Embodiment 2 of the present invention at a cross-sectional position A1-A2 shown in FIG. It is sectional drawing in sectional position A1-A2 shown in FIG. 5 regarding the modification of the superconducting electromagnet apparatus which concerns on Embodiment 2 of this invention. FIG. 4 is a cross-sectional view of the superconducting electromagnet device according to Embodiment 3 of the present invention, taken along a cross-sectional position X1-X2 shown in FIG. FIG. 8 is a cross-sectional view of the superconducting electromagnet device according to Embodiment 4 of the present invention, taken along a cross-sectional position X1-X2 shown in FIG. It is an explanatory view for explaining heat exchange between an exhaust pipe and a refrigerator connection pipe and helium gas according to Embodiment 4 of the present invention. FIG. 13 is a cross-sectional view of the superconducting electromagnet device according to Embodiment 5 of the present invention, taken along a cross-sectional position X1-X2 shown in FIG. FIG. 12 is a cross-sectional view of the superconducting electromagnet device according to Embodiment 5 of the present invention at a cross-sectional position B1-B2 shown in FIG. 11. FIG. 13 is a cross-sectional view of the superconducting electromagnet device according to Embodiment 6 of the present invention, taken along a cross-sectional position X1-X2 shown in FIG.

Embodiment 1 FIG.
The configuration of the superconducting electromagnet device according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of a superconducting electromagnet device according to Embodiment 1 of the present invention. FIG. 2 is a front view and a side view of the superconducting electromagnet device according to Embodiment 1 of the present invention. FIG. 2A shows a front view of the superconducting electromagnet device, and FIG. 2B shows a side view. FIG. 3 is a cross-sectional view of the superconducting electromagnet device according to Embodiment 1 of the present invention at a cross-sectional position X1-X2 shown in FIG. 1 and 2, only a part of the exhaust pipe 7 and the refrigerator connection pipe 10 are illustrated, and the check valve 13 (FIG. 3) is omitted.

  In the superconducting electromagnet device shown in FIGS. 1 to 3, a hollow cylindrical vacuum vessel 4 is arranged on the outermost side. The vacuum container 4 is made of, for example, a non-magnetic material such as stainless steel or aluminum to vacuum-insulate the inside and outside of the vacuum container 4. The inside of the vacuum vessel 4 is decompressed by a decompression device (not shown) so as to be evacuated.

  As shown in FIG. 3, for example, a heat shield plate 5 having a hollow cylindrical shape is disposed inside the vacuum container 4. The heat shield plate 5 is made of, for example, a non-magnetic material having a high light reflectance such as aluminum. A multilayer heat insulating material (super insulation) (not shown) may be attached to the surface of the heat shielding plate 5.

  Inside the heat shielding plate 5, for example, a hollow cylindrical refrigerant container 6 is arranged. The heat shielding plate 5 has a function of surrounding the periphery of the refrigerant container 6 and suppressing the inflow of radiant heat from the vacuum container 4 into the refrigerant container 6.

  The refrigerant container 6 functions as a low-temperature container for maintaining the superconducting coil 60 at a temperature of 6 K (liquefied helium temperature) or lower. The refrigerant container 6 houses the superconducting coil 60 in a state where it is immersed in liquefied helium (liquid refrigerant) 20. The coolant container 6 is provided with an opening 6a. The opening 6a corresponds to a region surrounded by a dashed line in FIG. Although details will be described later, the exhaust pipe 7 and the refrigerator connection pipe 10 are connected (communicated) with the inside of the refrigerant container 6 through the opening 6a. A helium gas (vaporized refrigerant) 30 is housed in the refrigerant container 6 in addition to the liquefied helium 20.

  Superconducting coil 60 is wound around the bottom of refrigerant container 6 which also functions as a winding frame. The inside of the refrigerant container 6 is filled with liquefied helium 20, which is a liquid refrigerant. The superconducting coil 60 is configured by winding a superconducting wire formed by embedding a niobium titanium alloy in the center of a matrix made of copper, for example.

  As shown in FIGS. 1 to 3, the superconducting electromagnet device further includes an exhaust pipe 7, a refrigerator 9 for cooling the inside of the refrigerant container 6, and a refrigerator connection pipe 10 connected to the refrigerator 9.

  An opening is provided in a part of the upper part of the vacuum vessel 4, and cooling heads 9 a and 9 b, which are parts of the refrigerator 9, are inserted into the vacuum vessel 4 from this opening. The remaining portion of the refrigerator 9 other than the cooling heads 9 a and 9 b is provided outside the vacuum vessel 4 and is fixed to the outer surface of the vacuum vessel 4. The cooling head 9b is inserted from the opening of the heat shield plate 5 to the inside thereof.

  The refrigerator connection pipe 10 is a pipe that guides the helium gas 30 inside the refrigerant container 6 to the cooling heads 9a and 9b, and returns the liquefied helium 20 generated by being cooled by the cooling heads 9a and 9b to the refrigerant container 6. That is, it is a tube for flowing the liquefied helium 20 or the helium gas 30 (refrigerant) between the refrigerant container 6 and the refrigerator 9.

  The cooling heads 9a and 9b are inserted inside the refrigerator connection pipe 10. The cooling heads 9a and 9b are portions protruding downward in the figure, and the refrigerator connection pipe 10 is configured to wrap the cooling heads 9a and 9b from below. The refrigerator connection pipe 10 is shaped to descend toward the refrigerant container 6 so that the liquefied helium 20 liquefied by the cooling heads 9a and 9b easily flows into the refrigerant container 6. The position where the cooling heads 9a and 9b of the refrigerator 9 are installed in the vacuum container 4 is different from the position where the exhaust pipe 7 is inserted into the vacuum container 4. That is, the refrigerator 9 is inserted into the vacuum vessel 4 from a position away from the exhaust pipe 7.

  The exhaust pipe 7 is made of, for example, stainless steel, and is a pipe for injecting the liquefied helium 20 into the refrigerant container 6 or exhausting the helium gas 30 generated inside the refrigerant container 6 to the outside of the vacuum container 4. It is.

  A preliminary exhaust pipe 8 is provided inside the exhaust pipe 7. The preliminary exhaust pipe 8 is a spare exhaust path for the exhaust pipe 7 and is used when the exhaust pipe 7 does not function, for example, when the exhaust pipe 7 is closed.

  The refrigerator connection pipe 10 is connected to the refrigerant container 6 via the opening 6 a of the refrigerant container 6. The refrigerator connection pipe 10 is a flow path through which the helium gas 30 flows between the refrigerant container 6 and the refrigerator 9 (cooling head). The refrigerator connection pipe 10 has a first bent portion (bent portion) 16a at one end of the pipeline and a second bent portion (bent portion) 16b at the other end of the pipeline. The refrigerator connection pipe 10 is connected to the refrigerator 9 at a first bent portion 16a, and is connected to the refrigerant container 6 via an opening 6a at a second bent portion 16b. In the following embodiments, “connection” includes a case where two components are directly (physical) connected and a case where they are indirectly connected by another component. On the other hand, “connection” means that two components are directly (physical) connected, not indirectly connected.

  In the superconducting electromagnet apparatus, a first lead 14a and a second lead 14b are provided as a configuration for energizing the superconducting coil 60. The superconducting coil 60 and the exhaust pipe 7 are electrically connected by the first lead 14a. Superconducting coil 60 and preliminary exhaust pipe 8 are electrically connected by second lead 14b. The exhaust pipe 7 and the preliminary exhaust pipe 8 are also used as electrodes for energizing the superconducting coil 60. The exhaust pipe 7 and the preliminary exhaust pipe 8 are electrically insulated.

  Here, the structure (connection structure) of the portion where the exhaust pipe 7 and the refrigerator connection pipe 10 are connected to the refrigerant container 6 will be described. In the present embodiment, the exhaust pipe 7 as the other pipe is connected to the refrigerator connection pipe 10 as one pipe. Further, a pipe protrusion 19 of the exhaust pipe 7 is formed inside the refrigerator connection pipe 10. More specifically, the end of one of the pipes (the pipe protrusion 19) is inserted into the inside of one of the pipes at a portion in the middle of one of the pipes. Inside one of the pipes, the pipe protrusion 19 extends in the same direction as the one of the pipes. Therefore, the other pipe (the exhaust pipe 7) and the one of the pipes (the refrigerator connection pipe 10) partially overlap each other. It has a tube structure.

  The exhaust pipe 7 and the refrigerator connection pipe 10 are connected (communicated) to the inside of the refrigerant container 6 via the opening 6 a of the refrigerant container 6. The connection point 18 is formed by connecting the refrigerator connection pipe 10 and the exhaust pipe 7 at the through hole 17 of the refrigerator connection pipe 10 by, for example, welding. The exhaust pipe 7 has a pipe protrusion 19 at an end on the refrigerant container 6 side. The pipe protrusion 19 is a pipe part protruding from the connection point 18 toward the refrigerant container 6. The pipe projecting portion 19 has an open end inside the connection structure. The end of the pipe projecting portion 19 on the refrigerant container 6 side is inserted into the refrigerant container 6 through the opening 6 a of the refrigerant container 6.

  The refrigerator connection pipe 10 is provided with a through-hole 17 formed in accordance with the exhaust pipe 7. The through-hole 17 corresponds to a region surrounded by a dashed arrow in FIG. The exhaust pipe 7 is inserted into the refrigerator connection pipe 10 at a through hole 17 provided in the second bent portion 16b of the refrigerator connection pipe 10, and is further inserted into the refrigerant container 6 at the opening 6a. . The cross-sectional shape of the exhaust pipe 7 is set at a connection point 18 with the refrigerator connection pipe 10 so that the exhaust pipe 7 can be inserted into the refrigerator connection pipe 10. In the figure, the exhaust pipe 7 is formed to have an outer diameter smaller than the inner diameter of the refrigerator connection pipe 10.

  In addition, as a method of connecting the exhaust pipe 7 and the refrigerator connection pipe 10, the connection by welding is illustrated, but the connection is not limited to the above example, and the exhaust pipe 7 and the refrigerator connection pipe 10 are connected using a flange. Alternatively, a configuration in which a sealing member such as an O-ring is provided at the connection portion may be employed. As long as the leakage of the helium gas 30 into the vacuum vessel 4 can be suppressed, any method of connecting the two pipes may be used.

  The preliminary exhaust pipe 8 has an outer diameter smaller than the inner diameter of the exhaust pipe 7 and is disposed inside the exhaust pipe 7. A check valve 13 is provided at an end of the exhaust pipe 7 located outside the vacuum vessel 4. The check valve 13 is set so that the valve opens when the internal pressure of the refrigerant container 6 exceeds a predetermined value. When the check valve 13 is opened, the helium gas 30 inside the refrigerant container 6 is discharged to the outside of the superconducting electromagnet device through the exhaust pipe 7 or the preliminary exhaust pipe 8.

  The refrigerator 9 is continuously operated when the superconducting electromagnet device is operating, and cools the inside of the refrigerant container 6 by cooling the helium gas 30. The refrigerator 9 is connected to the refrigerator connection pipe 10 by being inserted into one end of the refrigerator connection pipe 10. The refrigerator 9 is connected (communicated) with the inside of the refrigerant container 6 via a refrigerator connection pipe 10. As the refrigerator 9, a Gifford-McMaphon type refrigerator having two cooling heads, that is, a first-stage cooling head 9a and a second-stage cooling head 9b is used. Note that a pulse tube refrigerator may be used as the refrigerator 9.

  The first-stage cooling head 9a of the refrigerator 9 indirectly cools the exhaust pipe 7 via the thermal anchor 15a, the heat shield plate 5, and the thermal anchor 15b. The heat shield plate 5 and the thermal anchor 15a are connected to each other by a flexible conductor (not shown) made of a material having high thermal conductivity.

  The second-stage cooling head 9b of the refrigerator 9 is disposed in a space between the heat shield plate 5 and the refrigerant container 6, and is disposed inside the refrigerator connection pipe 10. When the second-stage cooling head 9b cools the helium gas 30 inside the refrigerant container 6, the helium gas 30 is liquefied to become liquefied helium 20.

  In the refrigerator connection pipe 10, an inclined portion that is arranged to be inclined with respect to the horizontal direction is formed in a pipe portion between the first bent portion 16a and the second bent portion 16b. The inclined portion is formed so as to approach the bottom surface of the refrigerant container 6 in the height direction as approaching the opening 6a. With such an inclined portion, the liquefied helium 20 liquefied by the second-stage cooling head 9b is easily returned to the refrigerant container 6.

  One end of the refrigerator connection pipe 10 on the side of the refrigerant container 6 is connected to the refrigerant container 6 through an opening 6a, and opens inside the refrigerant container 6. The refrigerator connection pipe 10 has a different outer diameter or cross-sectional area with the thermal anchor 15a as a boundary. Specifically, in the refrigerator connection pipe 10, the pipe portion that stores the second-stage cooling head 9b has a smaller pipe diameter than the pipe portion that stores the first-stage cooling head 9a of the refrigerator 9. Is done. Thereby, the cross-sectional area of the refrigerator connection pipe 10 can be reduced as compared with the case where the refrigerator connection pipe 10 is formed so that the two pipe parts have the same pipe diameter. Heat can be reduced. In the figure, a refrigerator connecting pipe 10 is formed such that the pipe diameter is equal to or larger than the diameter of the opening 6a in a pipe portion located between the heat shield plate 5 and the refrigerant container 6. You.

  With the configuration described above, in the superconducting electromagnet device, the exhaust pipe 7 and the refrigerator connection pipe 10 can be connected to the inside of the refrigerant container 6 via one opening 6a. As a result, the number of welding locations is two, that is, the connection location 18 and the opening 6a, and it is possible to reduce the number of processing steps of the superconducting electromagnet device, that is, the number of cutting steps and welding steps.

  In this embodiment, the cross-sectional position of FIG. 3 has been described with reference to FIG. 2. However, FIG. 2 is common to the following Embodiments 2 to 6, so that the superconducting electromagnet device in each of the following embodiments is described. FIG. 2 will be used when describing the cross-sectional position.

  FIG. 4 is an explanatory diagram illustrating heat exchange performed between the helium gas 30 and the exhaust pipe 7 according to Embodiment 1 of the present invention.

  In FIG. 4, helium gas 30 flowing out from the opening 6 a of the refrigerant container 6 directly cools the end of the refrigerator connection pipe 10 on the refrigerant container 6 side and is provided at the end of the exhaust pipe 7 on the refrigerant container 6 side. The provided pipe protrusion 19 can be directly cooled.

  Therefore, compared to a configuration in which the two pipes are connected to the refrigerant container via another configuration such as a connection box, the ends of the two pipes on the side of the refrigerant container 6 are maintained at a lower temperature, and the ends of the two pipes and the refrigerant The temperature difference between the container 6 and the container 6 can be reduced. Therefore, since it is not necessary to store the refrigerant in the connection box or the like, the amount of heat flowing into the refrigerant container 6 from both pipes can be reduced without complicating the cooling mechanism.

  The main heat inflow path into the refrigerant container 6 includes heat radiation from the heat shield plate 5 to the refrigerant container 6 and heat conduction from the exhaust pipe 7 and the refrigerator connection pipe 10. Since the superconducting electromagnet device is installed in a room temperature environment, heat continuously flows from the vacuum container 4 to the heat shield plate 5 and from the heat shield plate 5 to the refrigerant container 6. It is desirable that the heat flowing into the container be reduced as much as possible. In the superconducting electromagnet apparatus according to the present embodiment, with the above-described configuration, a structure in which heat inflow from exhaust pipe 7 and refrigerator connection pipe 10 is reduced as much as possible can be achieved.

  Here, the flow of the helium gas 30 will be described in more detail. Inside the refrigerator connection pipe 10, a flow of the helium gas 30 from the inside of the refrigerant container 6 toward the second-stage cooling head 9b (for example, indicated by a dotted arrow G1) occurs. The flow of the helium gas 30 is caused by the temperature difference between the refrigerant container 6 and the second stage cooling head 9b. The helium gas 30 is provided in the middle of the flow path of the helium gas 30 toward the second-stage cooling head 9b, so that the helium gas 30 flows on the outer surface of the pipe projection 19 of the exhaust pipe 7, and the helium gas 30 The pipe protrusion 19 is cooled.

  Note that the pipe protrusion 19 of the exhaust pipe 7 has a higher temperature than the refrigerator connection pipe 10 connected to the refrigerant container 6. Therefore, when the length of the pipe protrusion 19 is shorter than that shown in FIG. 3, the end of the pipe protrusion 19 may be located away from the flow like G1, and the pipe may be connected to the flow path of the helium gas 30. Even when the protrusion 19 is not provided, a natural convection shown by a dotted arrow G2 occurs due to a temperature difference between the wall surface of the exhaust pipe 7 and the wall surface of the refrigerator connection pipe 10. Due to the natural convection, the pipe protrusion 19 of the exhaust pipe 7 is cooled by the helium gas 30.

  In this embodiment, the configuration in which the end of the pipe protrusion 19 on the side of the refrigerant container 6 is inserted into the opening 6a of the refrigerant container 6 has been described. However, regardless of the length and shape of the pipe protrusion 19, the exhaust pipe If the pipe projecting portion 19 of 7 protrudes inside the refrigerator connecting pipe 10, cooling with the helium gas 30 can be performed efficiently. Further, as shown in FIG. 4, when the end of the refrigerator connection pipe 10 is also inserted into the opening 6 a of the refrigerant container 6, the liquefied helium 20 cooled by the refrigerator 9 flows back into the refrigerant container 6. However, it is hardly hindered by the helium gas 30 flowing outside the exhaust pipe 7. Therefore, the cooling efficiency of the refrigerant container 6 is improved.

  With the configuration described above, the superconducting electromagnet device of the present embodiment can be configured such that heat does not easily flow into the refrigerant container without complicating the cooling mechanism of the superconducting electromagnet device.

Embodiment 2 FIG.
FIG. 5 is a cross-sectional view of a main part showing a superconducting electromagnet device according to Embodiment 2 of the present invention. The present embodiment is different from the superconducting electromagnet apparatus of the first embodiment in that the heat transfer fins 11 are provided in the pipe protrusion 19 of the exhaust pipe 7. In the present embodiment, only the configuration different from the above-described embodiment will be described, and the description of the same or corresponding configuration will not be repeated.

  The heat transfer fins 11 are installed on the outer peripheral surface of the pipe protrusion 19 in the exhaust pipe 7. The heat transfer fins 11 are, for example, comb-type fins in which a plurality of plate members are arranged, and the heat exchange area with the helium gas 30 can be increased. The heat transfer fins 11 are made of a material having a high thermal conductivity such as aluminum or copper.

  FIG. 6 is a cross-sectional view of the superconducting electromagnet device according to Embodiment 2 of the present invention at a cross-sectional position A1-A2 shown in FIG. As shown in FIG. 6, the heat transfer fins 11 are arranged on the outer peripheral surface of the pipe protrusion 19 of the exhaust pipe 7.

  In the present embodiment, the heat transfer fins 11 have a comb-shaped fin shape, but may have any shape. FIG. 7 is a cross-sectional view illustrating another installation example of the heat transfer fins 11. As shown in FIG. 7, the heat transfer fins 11 may be provided on the inner peripheral surface in addition to the outer peripheral surface of the pipe protrusion 19 of the exhaust pipe 7. Note that a configuration in which the heat transfer fins 11 are provided only on the inner peripheral surface of the pipe projecting portion 19 may be employed.

  The distance between the heat transfer fins 11 and the inner wall surface of the refrigerant container 6 is a distance that does not impair the workability of the superconducting electromagnet device when the superconducting electromagnet device is manufactured. It is sufficient that the interval is such that the insulation is not broken.

  By providing the heat transfer fins 11 at the pipe protrusion 19 of the exhaust pipe 7, the heat exchange area between the refrigerator connection pipe 10 and the helium gas 30 flowing inside the exhaust pipe 7 can be increased, and the inside of the refrigerant container 6 can be increased. The heat flow into the air can be further suppressed.

  6 and 7, the heat transfer fins 11 are arranged on the outer peripheral surface of the pipe protrusion 19 at equal intervals in the circumferential direction. Is not limited to the above example, and may be set as appropriate.

  With the above configuration, in the superconducting electromagnet device of the present embodiment, since the heat transfer fins 11 are provided in the pipe projecting portion 19, the temperature of the exhaust pipe 7 is further reduced, and the temperature of the exhaust pipe 7 is further reduced. In addition to the effect of the first embodiment, the effect that the heat inflow can be further suppressed is exhibited.

Embodiment 3 FIG.
FIG. 8 is a cross-sectional view of the superconducting electromagnet device according to Embodiment 3 of the present invention at a cross-sectional position X1-X2 shown in FIG. This embodiment is different from the superconducting electromagnet device of the above-described embodiment in that a refrigerator connection pipe 10A including three pipes is provided. In the present embodiment, only the configuration different from that of the first embodiment will be described, and the description of the same or corresponding configuration will not be repeated.

  The refrigerator connection pipe 10A is composed of three elements: a refrigerator installation pipe 101a, a container connection pipe 101b, and a connection pipe 101c.

  The refrigerator installation pipe 101a is formed, for example, in a cylindrical shape. In the refrigerator installation pipe 101a, the end on the refrigerant container 6 side, that is, one end in the cylindrical axial direction is a closed end, and the other end is an open end. The refrigerator installation pipe 101a is connected to the refrigerator 9 at an open end. In the refrigerator installation pipe 101a, an opening 1010a is provided on a side peripheral surface closer to the closed end than the open end. The refrigerator installation pipe 101a is connected to the connection pipe 101c via the opening 1010a. Further, the refrigerator installation pipe 101a is connected to the heat shield plate 5 via the thermal anchor 15a.

  The container connection pipe 101b is a cylindrical pipe connected to the refrigerant container 6 so as to cover the opening 6a. In the container connecting pipe 101b, the end on the refrigerant container 6 side, that is, one end in the cylindrical axial direction is an open end, and the other end in the cylindrical axial direction is a closed end.

  The container connection pipe 101b has an open end inserted into the refrigerant container 6 through the opening 6a. A through-hole 17 is provided at the closed end of the container connection pipe 101b. The exhaust pipe 7 is inserted into the refrigerator connection pipe 10A through the through hole 17.

  An opening 1010b is formed on the side peripheral surface of the container connection pipe 101b closer to the closed end than the open end. The container connection pipe 101b is connected to the connection pipe 101c via the opening 1010b.

  The connection pipe 101c connects the open part 1010a of the refrigerator installation pipe 101a and the open part 1010b of the container connection pipe 101b. By forming the connecting pipe 101c in a bellows shape, the distance from the refrigerator connecting pipe 10A to the inside of the refrigerant container 6 can be increased. Thereby, the conduction heat resistance of the refrigerator connecting pipe 10A can be increased, and the amount of heat flowing into the refrigerant container 6 via the refrigerator connecting pipe 10A can be reduced.

  In the present embodiment, in the refrigerator connecting pipe 10A, the connecting pipe 101c has a bellows shape. However, a pipe portion other than the connecting pipe 101c may have a bellows shape. It is sufficient that any part of the machine connection pipe 10A has a bellows shape.

  FIG. 8 illustrates a case where the connecting pipe 101c is arranged in parallel to the bottom surface of the refrigerant container 6. However, the connection pipe 101c may be configured with an inclined portion that is inclined with respect to the bottom of the refrigerant container 6, as in the refrigerator connection pipe 10 of the first embodiment.

  In the present embodiment, an example in which the refrigerator connecting pipe 10A includes three components will be described. However, the refrigerator connecting pipe 10A may include two components. It may be composed of components. That is, the refrigerator connection pipe 10A may be composed of a plurality of components.

  With the configuration described above, in the superconducting electromagnet device of the present embodiment, the refrigerator connecting pipe 10A can be manufactured by being divided into a plurality of elements. Is not required, and the workability of the refrigerator connection pipe 10A can be improved.

  In addition, the effect that the amount of heat flowing into the refrigerant container 6 can be reduced by forming a part of the refrigerator connection piping 10A into a bellows shape is obtained in addition to the effect of the first embodiment.

Embodiment 4 FIG.
FIG. 9 is a cross-sectional view of the superconducting electromagnet device according to Embodiment 4 of the present invention at a cross-sectional position X1-X2 shown in FIG. In the present embodiment, the refrigerator connection pipe 10B as the other pipe is connected to the exhaust pipe 7B as one pipe, and the pipe protrusion 19b of the refrigerator connection pipe 10B is provided inside the exhaust pipe 7B. This is a configuration provided, and is different from the superconducting electromagnet device of the above-described embodiment.

  In the present embodiment, only the configuration different from the above-described embodiment will be described, and the description of the same or corresponding configuration will not be repeated.

  The exhaust pipe 7B has a first bent portion 21a and a second bent portion 21b in a space between the heat shield plate 5 and the refrigerant container 6. The first bent portion 21 a of the exhaust pipe 7 </ b> B is formed in the middle of the exhaust pipe 7 </ b> B from the outside of the vacuum container 4 to the opening 6 b of the refrigerant container 6.

  The second bent portion 21b of the exhaust pipe 7B is provided at an end of the exhaust pipe 7B on the refrigerant container 6 side. The exhaust pipe 7B is connected to the refrigerant container 6 via the opening 6b at the second bent portion 21b. In the exhaust pipe 7B, a through-hole 17b is provided in the second bent portion 21b. The connecting portion 18b is formed by connecting the refrigerator connection pipe 10B and the exhaust pipe 7B at the through-hole 17b by, for example, welding.

  The refrigerator connection pipe 10B has a pipe protrusion 19b protruding from the connection point 18b toward the inside of the exhaust pipe 7B. Further, the pipe projecting portion 19b projects toward the opening 6b of the refrigerant container 6. An opening end is provided in the pipe protrusion 19b. That is, the pipe projecting portion 19b is open at the end on the refrigerant container 6 side. The end of the pipe protrusion 19b on the refrigerant container 6 side is inserted into the refrigerant container 6 through the opening 6b of the refrigerant container 6. The refrigerator connection pipe 10B and the exhaust pipe 7B are electrically insulated and connected by an insulating joint or the like at the position of the through hole 17b.

  The preliminary exhaust pipe 8b has an outer diameter smaller than the inner diameter of the exhaust pipe 7B, and is disposed inside the exhaust pipe 7B. An end of the preliminary exhaust pipe 8b on the refrigerant container 6 side is configured to open at the first bent portion 21a of the exhaust pipe 7B.

  FIG. 10 is an explanatory diagram illustrating heat exchange performed between helium gas 30 and exhaust pipe 7B according to Embodiment 4 of the present invention. In FIG. 10, a flow of helium gas 30 (shown by a dashed arrow G3) is generated inside a connection structure formed by connecting the exhaust pipe 7B and the refrigerator connection pipe 10B.

  Note that the pipe protrusion 19b of the refrigerator connection pipe 10B has a higher temperature than the exhaust pipe 7B connected to the refrigerant container 6. Therefore, there is a temperature difference between the wall surface of the exhaust pipe 7B and the wall surface of the refrigerator connection pipe 10B. Due to this temperature difference, the flow (G3) of the helium gas 30 described above is generated as natural convection. Thus, heat exchange is performed between the helium gas 30 flowing outside the refrigerator connection pipe 10B and the exhaust pipe 7B by natural convection of the helium gas 30. The heat exchange cools the refrigerator connection pipe 10B.

  Therefore, the temperature of the refrigerator connection pipe 10B can be kept lower than that in a case where the refrigerant connection pipe 10B is connected to the refrigerant container via another configuration such as a connection box. 6, the amount of heat flowing into the refrigerant container 6 via the exhaust pipe 7B and the refrigerator connection pipe 10B can be reduced.

  With the above configuration, in the superconducting electromagnet device of the present embodiment, since the pipe projecting portion 19b is provided, the same effect as that of the first embodiment can be obtained.

Embodiment 5 FIG.
FIG. 11 is a cross-sectional view of a superconducting electromagnet device according to Embodiment 5 of the present invention, taken along a cross-sectional position X1-X2 shown in FIG. FIG. 12 is a cross-sectional view of the superconducting electromagnet device according to the present embodiment at cross-sectional position B1-B2 shown in FIG.

  The present embodiment is different from the superconducting electromagnet apparatus of the fourth embodiment in that the heat transfer fins 11 are provided on the pipe protrusion 19b of the refrigerator connection pipe 10B. In the present embodiment, only the configuration different from the above-described embodiment will be described, and the description of the same or corresponding configuration will not be repeated.

  As shown in FIGS. 11 and 12, in the refrigerator connection pipe 10B, the heat transfer fins 11 are arranged on the outer peripheral surface of the pipe protrusion 19b. Note that the heat transfer fins 11 may be arranged on the inner peripheral surface of the pipe protrusion 19b.

  By providing the heat transfer fins 11 in the pipe projecting portion 19b of the refrigerator connection pipe 10B, the heat exchange area between the refrigerator connection pipe 10B and the helium gas 30 flowing inside the exhaust pipe 7B can be increased. 6 can be further suppressed.

  In FIG. 12, the heat transfer fins 11 are arranged at equal intervals in the circumferential direction on the outer peripheral surface of the pipe projecting portion 19b, but the arrangement method of the heat transfer fins 11 and the number of heat transfer fins 11 to be arranged are shown in FIG. The present invention is not limited to this example, and may be set as appropriate.

  With the above configuration, in the superconducting electromagnet device of the present embodiment, since the heat transfer fins 11 are provided, the following effects are exerted in addition to the effects of the fourth embodiment. In other words, since the heat exchange area between the helium gas 30 and the refrigerator connection pipe 10B increases, the temperature of the refrigerator connection pipe 10B can be maintained at a lower temperature, so that the amount of heat flowing into the refrigerant container 6 is reduced. be able to.

Embodiment 6 FIG.
FIG. 13 is a cross-sectional view of the superconducting electromagnet device according to Embodiment 6 of the present invention at a cross-sectional position X1-X2 shown in FIG. This embodiment is different from the superconducting electromagnet devices of the above-described fourth and fifth embodiments in that exhaust pipe 7C is constituted by a plurality of components. In the present embodiment, only the configuration different from the above-described embodiment will be described, and the description of the same or corresponding configuration will not be repeated.

  The exhaust pipe 7C according to the present embodiment includes three elements: an outer protruding pipe 70a, a container connecting pipe 70b, and a connecting connecting pipe 70c.

  The external protruding pipe 70a of the exhaust pipe 7C is connected to a thermal anchor 15a provided on the heat shield plate 5. The external protruding pipe 70a of the exhaust pipe 7C is arranged so that one end thereof protrudes outside the vacuum vessel 4. The other end of the outer projecting tube 70a is a closed end, and an open portion 700a is provided on a side surface of the closed end. The external protruding tube 70a is connected to the connection connecting tube 70c via the opening 700a.

  The container connecting pipe 70b of the exhaust pipe 7C is formed, for example, in a cylindrical shape. The cylindrical end of the container coupling tube 70b is an open end, and the other end of the axial direction is a closed end. The open end of the container connecting pipe 70b is inserted into the refrigerant container 6 through the opening 6b. At the closed end of the container connection pipe 70b, a connection point 18b for connection to the refrigerator connection pipe 10B is provided. The container connecting pipe 70b has an outer diameter corresponding to the diameter of the opening 6b.

  An opening 700b is formed on a side peripheral surface closer to the closed end than the open end of the container connecting pipe 70b. The container connecting pipe 70b is connected to the connecting connecting pipe 70c via the opening 700b.

  The connection pipe 70c of the exhaust pipe 7C communicates between the open part 700a of the external protruding pipe 70a and the open part 700b of the container connection pipe 70b. The coupling connection pipe 70c is formed by a bellows-shaped pipe. With such a configuration, the distance to the inside of the refrigerant container 6 in the exhaust pipe 7C is increased, and the conduction thermal resistance of the exhaust pipe 7C is increased. As a result, the amount of heat flowing into the refrigerant container 6 by heat conduction through the exhaust pipe 7C is reduced.

  FIG. 13 illustrates a configuration in which the coupling connection pipe 70c is arranged in parallel with the bottom surface of the refrigerant container 6. However, the coupling connection pipe 70c may be configured with an inclined portion inclined with respect to the bottom surface of the refrigerant container 6.

  In the present embodiment, an example has been described in which the exhaust pipe 7C includes three components. However, the exhaust pipe 7C may include two components, and further includes four or more components. It may be. That is, the exhaust pipe 7C may be composed of a plurality of components.

  In the superconducting electromagnet apparatus having the above configuration, the exhaust pipe 7C is manufactured by being divided into a plurality of elements. Therefore, as compared with the exhaust pipes 7B according to the fourth and fifth embodiments, the bending process can be reduced in manufacturing the exhaust pipe 7C, and the workability of the exhaust pipe 7C can be improved.

  In addition, since the coupling connection pipe 70c has a bellows shape, the amount of heat flowing into the refrigerant container 6 by heat conduction can be reduced.

  The present invention is not limited to the specific details and representative embodiments described and described above. Further modifications and effects which can be easily derived by those skilled in the art are also included in the present invention. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and equivalents thereof.

Reference Signs List 4 Vacuum container 6 Refrigerant container 7, 7B, 7C Exhaust pipe 9 Refrigerator 10, 10A, 10B Refrigerator connection pipe 11 Heat transfer fins 17, 17b Through hole 16a First bent portion (bent portion)
16b 2nd bend (bend)
19, 19b Pipe protrusion 21a First bent portion (bent portion)
21b Second bent part (bent part)
60 superconducting coil

Claims (8)

A superconducting coil,
Along with storing the superconducting coil in a state of being immersed in a liquid refrigerant, a refrigerant container provided with an opening,
A vacuum container containing the refrigerant container,
An exhaust pipe for exhausting the refrigerant vaporized inside the refrigerant container to the outside of the vacuum container,
A refrigerator that is inserted into the vacuum vessel from a position away from the exhaust pipe and cools the refrigerant,
A refrigerator connection pipe for flowing the refrigerant inside the refrigerant container to the refrigerator.
One of the exhaust pipe and the refrigerator connection pipe is connected to the refrigerant container through the opening,
The other pipe has a pipe protruding portion in which an end of the other pipe is inserted into the inside of the one pipe from a through hole provided in the middle of the one pipe and projects into the inside of the one pipe. Having a superconducting electromagnet device. The superconducting electromagnet device according to claim 1, wherein the pipe projecting portion projects toward the opening of the refrigerant container. The superconducting electromagnet device according to claim 1 or 2, wherein an end of the pipe protrusion is inserted into the refrigerant container through the opening. The other pipe is the exhaust pipe,
The superconducting electromagnet device according to any one of claims 1 to 3, wherein at least a part of the pipe protrusion is located in a flow path in which the vaporized refrigerant flows from the opening to the refrigerator. The one pipe is the refrigerator connection pipe,
The superconducting electromagnet device according to any one of claims 1 to 4, wherein the refrigerator connection pipe is inserted into the refrigerant container through the opening. The superconducting electromagnet device according to any one of claims 1 to 5, wherein at least one of the exhaust pipe and the refrigerator connection pipe has a bent portion.   The superconducting electromagnet device according to any one of claims 1 to 6, wherein a heat transfer fin is provided on at least one of an inner peripheral surface and an outer peripheral surface of the pipe protrusion.   The superconducting electromagnet device according to any one of claims 1 to 7, wherein at least one of the exhaust pipe and the refrigerator connection pipe has a portion formed in a bellows shape.

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