JP2002222709A - Magnet field generating coil device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic field generating coil device which is easily handled, entails a low refrigerant cost, and is highly safe. SOLUTION: A coil 2 which generate a magnetic field when a current is applied is housed in a cryostat 3 for the formation of a magnetic field generating coil unit. The coil 2 is composed of a bobbin 21 and a coil winding 22, and the cryostat 3 is equipped with an opening 30 and a refrigerant inlet 31. Provided that the inner volume of the cryostat is represented by V1, and the volume of the coil 2 is represented by V2, the volume ratio V1/V2 ranges from 1.5 to 10. Provided that the area of the refrigerant inlet, the maximum thickness of the cryostat 3 in a center axial direction, and the maximum length of the cryostat 3 in a radial direction vertical to the center axis are represented by S [mm2], L1 [mm2], and L2 [mm2], respectively; S, L1, and L2 are so set as to satisfy a formula, 10<=S<=(L1×L2).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic field generating coil device used as a direct source of a magnetic field in various devices requiring a strong magnetic field, such as a magnetic field processing device, a magnetizing device, a magnetic separation device, and the like.

[0002]

2. Description of the Related Art A magnetic field is magnetized in a bulk (bulk) high-temperature superconductor to form a strong magnet, that is, application of the high-temperature superconductor to a superconducting bulk magnet is being studied. As a method of exciting a superconducting bulk magnet and applied equipment, for example, Japanese Unexamined Patent Application Publication No. 11-283822 (Reference 1) and Japanese Unexamined Patent Application Publication No. 2000-277
333 (Document 2) and the like are disclosed.

[0003] Reference 1 discloses that a superconductor is cooled by a refrigerator,
1 shows a magnetic field generating coil device that excites a superconducting bulk magnet using a magnetizing coil. In Reference 2,
The ferromagnetic material is brought close to the superconductor, and a pulse current is applied to the magnetizing coil to generate a magnetic field. The ferromagnetic material functions as a yoke for the generated magnetic field, the superconductor is magnetized, and a superconducting bulk magnet can be obtained.

In the above-mentioned documents 1 and 2, the magnetizing of the superconductor utilizes a magnetizing coil. This magnetized coil is composed of a magnetic field generating coil device having a coil portion housed inside a refrigerant container. The coil unit includes a bobbin and a coil winding wound around the bobbin.

[0005]

However, in the magnetizing coils described in the above-mentioned documents 1 and 2, since the refrigerant container is open to the outside, the use (installation) direction of the magnetizing coils is limited, and handling is difficult. It was troublesome. In addition, the above-mentioned magnetized coil is liable to decrease the refrigerant due to evaporation and divergence, and there is a danger that the refrigerant is scattered from an open portion of the refrigerant container.
There were problems with ease of use, economy, and safety.

The present invention has been made in view of such conventional problems, and an object thereof is to provide a magnetic field generating coil device which is easy to handle, has a low refrigerant cost, and is excellent in safety.

[0007]

According to a first aspect of the present invention, there is provided a magnetic field generating coil device in which a coil unit for generating a magnetic field when energized is housed in a refrigerant container, wherein the coil unit is wound around a bobbin. The refrigerant container is provided with an opening and a refrigerant inlet formed to the opening, wherein the internal volume of the refrigerant container is V1 and the volume of the coil is V2. , The ratio V1 / V2 of both is 1.5
-10 and the refrigerant inlet area S [m
m ² ] is the maximum thickness of the refrigerant container along the central axis direction, L
1 [mm], the maximum length in the radial direction perpendicular to the central axis is L2
When [mm], 10 ≦ S ≦ (L1 × L2).

In the magnetic field generating coil device according to the present invention, the above relationship is established between the internal volume V1 of the refrigerant container and the volume V2 of the coil portion. Therefore, the volume of the coil
The amount of the refrigerant is sufficient, and the coil can be sufficiently cooled by the refrigerant. Therefore, the coil section can stably generate a magnetic field.

Further, since the refrigerant is unlikely to evaporate excessively, the refrigerant is consumed without waste and is economical. Further, since the size of the refrigerant container is not increased more than necessary, the overall size of the magnetic field generating coil device is compact and easy to handle. Further, since the refrigerant injection port is provided at the opening, the operation of injecting the refrigerant can be easily performed, and the operation is safe. The internal volume V1 of the refrigerant container is the internal volume of the refrigerant container itself, and does not include the internal volume of the refrigerant inlet.

If V1 / V2 is less than 1.5, the amount of refrigerant to be cooled in the coil portion is reduced, and it takes time to cool the coil portion, and the start-up time of the magnetic field generating coil device may be lengthened. is there. In addition, the coil portion cannot be sufficiently cooled at the time of energization, and it may be difficult for current to flow through the coil portion due to heat generation. Further, the heat generated in the coil portion may cause a break in the coil winding. Further, the refrigerant is likely to evaporate due to the heat generated by the coil portion, and it may be necessary to supply the refrigerant frequently. On the other hand, V1 / V2 is 10
If it is larger, the size of the magnetic field generating coil device may be large and handling may be difficult.

Further, in the magnetic field generating coil device according to the present invention, since the area S [mm ² ] of the refrigerant inlet of the refrigerant container satisfies the above relationship, the refrigerant can be easily injected, the size is compact, and the handling is easy. A magnetic field generating coil device can be obtained. The coolant inlet area S is an area of a portion serving as an inlet of the coolant inlet, as shown in FIG. 2 described later.

If the area S of the refrigerant inlet is less than 10 [mm ² ], it is difficult to inject the refrigerant, so that the injection operation takes time and the operation of the injection may be troublesome. Further, when the area S is larger than L1 × L2, the refrigerant injection port is much larger than the coil portion, so that the refrigerant container may be large and difficult to handle. Furthermore, there is a possibility that the amount of evaporation of the refrigerant may increase or that the refrigerant may be easily scattered when the refrigerant is injected.

As described above, according to the present invention, handling is easy.
It is possible to provide a magnetic field generating coil device having a low refrigerant cost and excellent safety.

The refrigerant container may be configured to surround the coil portion in a donut shape along the coil winding. In this case, a space without refrigerant can be created inside the coil portion, and this space can be used as a magnetic field working space (see FIG. 1). Further, the refrigerant container may be formed in a cylindrical shape surrounding the entire coil portion. In this case, the coil portion can be formed in a spiral shape (solenoid shape having a zero inner diameter), and the coil portion and the magnetic field acting space can be in a positional relationship facing each other (FIG. 11).
See FIG. 13). The external shape of the refrigerant container may be any shape such as a cylindrical shape or a cylindrical shape having a polygonal cross section (see FIG. 2B).

The refrigerant container is filled with a liquid refrigerant when the magnetic field generating coil device is used, so that the coil portion can be cooled. As the liquid refrigerant, for example, a low-temperature refrigerant such as liquid nitrogen, liquid oxygen, and liquid air can be used. By using such a low-temperature refrigerant, the electric resistance of the coil winding can be reduced, and a current larger than the current that can flow at room temperature can be supplied. In this case, a larger strong magnetic field can be generated by the small coil unit.

As the material of the refrigerant container, various metal materials such as stainless steel, fiber reinforced plastic, polyimide, and foamed resin, and resin materials can be used. In the case of a material having poor heat insulating properties, such as a metal, it is preferable to cover the surface of the refrigerant container with a heat insulating material. Further, the refrigerant container can be formed integrally with the coil unit. In this case, it can be realized by fixing the refrigerant container to the coil portion by using welding or the like after assembling the coil portion.

A refrigerant inlet is provided at the opening of the refrigerant container, and this part is used as an inlet / outlet for the refrigerant, an inlet / outlet for interconnection between the coil winding and an external power supply in the coil part, and the like. Can be. Further, the cross-sectional shape of the refrigerant injection port can be configured in any shape such as a circle, an ellipse, and a polygon.

Next, as in the second aspect of the present invention, the coil portion is wound around a bobbin composed of a mandrel and flange portions provided at both ends of the mandrel, and an outer periphery of the mandrel. And a cylindrical cover disposed outside of the wound coil winding. The flange has a fixing portion for fixing the coil to the refrigerant container. Preferably, the fixed portion is configured to support the magnetic field generating coil device at a desired position.

In the fixing portion, the coil portion can be directly fixed from the outside without the intervention of the refrigerant container, so that a shock when energizing the coil portion does not directly reach the refrigerant container. For this reason, the thickness of the refrigerant container can be reduced to reduce the weight. Further, the fixing of the refrigerant container to the coil portion and the support of the coil portion at a desired position can be realized through the common fixing portion. Therefore, heat intrusion into the coil from the outside of the refrigerant container can be minimized, and evaporation of the refrigerant can be suppressed.

Next, it is preferable that the fixing portion is provided in a direction parallel to a central axis direction of the coil portion. Here, a case where an object to be subjected to a magnetic field action exists in the magnetic field action space of the magnetic field generating coil device according to the present invention will be considered. The magnetic field acting space is a space in which a magnetic field generated from the magnetic field generating coil device exists. For example, when the magnetic field generating coil device according to the present invention is used for magnetizing a superconductor, the superconductor is connected to the magnetic field acting space. And apply a magnetic field.

An object is placed at a position shifted from the center of the coil portion in the thickness direction (the same direction as the length L1 shown in FIG. 2) (for example, when the thickness of the superconductor 591 changes in FIG. 1 described later). If the coil portion is arranged at a position facing the coil portion (FIG. 11 to be described later), the coil portion mainly receives a force in the direction of the central axis during energization. In the magnetic field generating coil device according to the present invention, since the fixed portion is oriented in a direction parallel to the central axis direction of the coil portion, the fixed portion is configured to receive not the bending force but the compressive force or the tensile force. Can be fixed. Therefore, the fixed portion can be made smaller, and the entire magnetic field generating coil device can be made smaller and lighter.

Next, according to a fourth aspect of the present invention, the coil portion has a terminal portion for electrically connecting the coil winding to an external power supply, and the terminal portion is connected to the refrigerant in the refrigerant container. Preferably, it is located at the inlet. In the magnetized coil, when the cables from the external power supply and the coil winding are directly connected, stress is applied to the coil winding at the time of connection, and the cable vibrates when a pulse current is applied to the coil winding. As a result, the coil winding may be disconnected.

By providing the terminal portion and connecting the coil winding to an external power supply via the terminal portion as in the configuration according to the present invention, it is possible to prevent the coil winding from being disconnected due to an impact during energization. Can be. In addition, by providing the terminal portion at the coolant inlet, the connection and disconnection of the wiring from the external power supply can be easily realized, so that the attachment and detachment operation of the entire coil portion can be facilitated.

Next, as in the fifth aspect of the present invention, the coil section has a terminal section for electrically connecting the coil winding to an external power supply, and the terminal section is provided outside the refrigerant container. Is preferably provided. In this case, since it is not necessary to attach / detach the wiring from the external power source in the refrigerant container, the attaching / detaching operation of the entire coil unit can be facilitated.

Next, as in the invention according to claim 6, the refrigerant inlet is located outside a plane including an end surface perpendicular to a central axis of the coil portion and a cylindrical surface including an outer peripheral surface of the coil portion. It is preferable that the opening is provided outside the refrigerant container outside. By arranging the coolant inlets in the above-described positional relationship, the center axis of the coil section can be arranged in the vertical direction at the installation location of the coil section, and the coil section can be arranged even when the center axis of the coil section is horizontal. Can be completely immersed in the refrigerant. In other words, the coil unit can be used in a positional relationship where the magnetic field generation direction is vertical or in a horizontal relationship. Therefore, the magnetic field generating coil according to the present invention can be used by being arranged at any angle from vertical to horizontal while being cooled by the refrigerant.

The "end face perpendicular to the central axis of the coil portion"
And “outer peripheral surface” means that the coil winding to be energized only needs to be cooled.
Substantially, it means the “end surface of the coil winding” and the “outer peripheral surface”, respectively. Specific positions of these “end face” and “outer peripheral face” are described in FIG. 10 and the like. For example, in the magnetic field generating coil device according to FIG. 10, the “end surface” is a plane including the inner surface of the flange portion, and the “outer peripheral surface” is a cylindrical surface including the inner surface of the “cylindrical cover”.

Next, as in the present invention, the coil portion is located closer to the inner wall of the refrigerant container so that a strong magnetic field action space is formed outside the refrigerant container. It is preferable to arrange them. Thus, the magnetic field generated from the coil portion can be efficiently transmitted to the outside of the refrigerant container, and the strength of the magnetic field in the magnetic field working space can be increased. The magnetic field acting space is a space in which a magnetic field is formed in the magnetic field generating coil device. When a superconductor is magnetized as in Embodiment 1 described later, the superconductor is arranged here.

Next, the magnetic field generating coil device has an external yoke, which is attached to and detached from the magnetic field generating coil device via an attaching / detaching member. Preferably, it is installed as possible. By providing the external yoke, the magnetic field is concentrated around the vicinity of the external yoke, so that a stronger and more concentrated magnetic field can be obtained.

When the object is magnetized using the external yoke (magnetization of a superconductor as shown in FIG. 1 to be described later can be given as an example), the magnetized object and the external The yoke will be strongly attracted. For this reason, a strong force is required when removing the magnetic field generating coil device from the object after the magnetization is completed, and the work is troublesome. In addition, there is a risk that the worker may pinch his or her hand between the object to be attracted by a strong force and the outer yoke. In addition, special jigs and tools were sometimes required to safely remove the magnetic field generating coil device.

According to the structure of the present invention, by providing a structure in which the external yoke can be attached and detached to and from the coil portion in advance, it is easy to handle the magnetic field generating coil device when removing the object. it can.

The external yoke can be arranged in various positions with respect to the coil portion. For example, FIG.
As shown in the figure, it can be arranged at the center of the solenoid-shaped coil. In addition, as shown in FIG. 13, the object can be disposed in such a manner that the object is sandwiched between the coil portion and the external yoke.

As the constituent material of the outer yoke, high permeability materials such as permendur having high saturation magnetization or large residual magnetization, soft magnetic iron and silicon steel, Sm-Co, Nd-F
A permanent magnet material such as eB can be used.

Next, as in the ninth aspect of the present invention, the magnetic field generating coil device has an external yoke, and the external yoke is connected to the base fixed to the refrigerant container via a detachable member. It is preferable that the magnetic field generating coil device and the magnetic field generating coil device are detachably installed together with the unit. The coil portion and the external yoke can be detached integrally by the attaching / detaching member. Therefore, even when the object in the magnetic field working space is magnetized and strongly attracted to the external yoke, both the coil portions and the external yoke are externally connected. The yoke can be easily and safely performed with a small number of procedures.

Next, it is preferable that the detachable member has a screw structure. Thus, the external yoke can be easily attached and detached manually by using a simple tool.

As an example of the structure of the detachable member, there is a structure in which a thread is provided at the tip of a rod as shown in FIG. With this structure, a notch is provided in the middle of the rod, and a hexagonal hole, + groove,-groove, etc. are provided at the end of the rod, and the rod is turned with a simple tool to remove the external yoke or coil. Can be realized. Further, as an example of the detachable member, a structure in which a bolt and a nut are combined as shown in FIG.

Next, as in the eleventh aspect of the present invention, it is preferable that the coil section is configured to generate a magnetic field by applying a pulse current. Since the pulse current can flow a current larger than the steady current, a stronger magnetic field can be generated. Further, as the pulse current at this time, various types of currents such as a sine wave, a square wave, a sawtooth wave, and a capacitor discharge wave can be used.

Next, the inner radius of the cylindrical cover is set to R1 [mm] and the tensile strength is set to F.
[MPa], and the coil constant of the coil unit is α [T /
A], the maximum value of the current flowing through the coil unit is Imax
In the case of [A], the thickness t [mm] of the cylindrical cover
Is 0.4 × (R1 / F) × (α × Imax) ² ≦ t ≦
It is preferable that the relationship of 8 × (R1 / F) × (α × Imax) ² is established.

At the time of pulse magnetization, a high current can be instantaneously passed through the coil winding. In this case, the coil winding expands at the moment when the current is supplied. Therefore, the cylindrical cover must be strong enough to withstand the expansion of the coil winding. By setting the thickness of the cylindrical cover within the above range, it is possible to obtain a coil portion in which the coil portion is less likely to be damaged when a pulse current is applied and a pulse current can be supplied with a larger current.

The thickness t [mm] of the cylindrical cover is 0.4 ×
If it is less than (R1 / F) × (α × Imax) ² ,
The strength of the cylindrical cover is weak, and when a pulse current is applied, cracks or ruptures may occur, and the coil portion may be damaged.

On the other hand, when the thickness t [mm] of the cylindrical cover is 8 ×
When the thickness is larger than (R1 / F) × (α × Imax) ² , the coil portion becomes large, and therefore, the entire magnetic field generating coil device becomes large, heavy, and may be difficult to handle. Also, since the heat capacity of the coil part increases,
The cooling by the refrigerant takes a long time, and the consumption of the refrigerant may increase. Note that the coil constant is a numerical value representing a magnetic field generated at the center of the coil unit when a current of 1 A flows through the coil unit in units of T (tesla).

[0041]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 A magnetic field generating coil device according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIG.
The magnetic field generating coil device 1 according to the present embodiment includes a coil unit 2 for generating a magnetic field when energized, and a refrigerant container 3 containing the coil unit 2.
And The coil unit 2 includes a bobbin 21 and the bobbin 2
And a coil winding 22 wound around the coil winding 22. Further, the refrigerant container 3 includes an opening 30 and a refrigerant inlet 31 formed for the opening 30.

When the internal volume V1 of the refrigerant container 3 and the volume V2 of the coil portion 2 are set, the ratio V1 / V
2 is in the range of 1.5 to 10. Further, as shown in FIG. 2, the refrigerant inlet area S [mm ² ] is
When the maximum thickness along the central axis direction is L1 [mm] and the maximum length in the radial direction perpendicular to the central axis is L2 [mm],
10 ≦ S ≦ (L1 × L2).

The details will be described below. As shown in FIG. 3, the magnetic field generating coil device 1 of the present embodiment has a superconducting magnet device 5.
It is used as an exciting coil when exciting the superconductor 591 in (a device for exciting a superconductor to generate a strong magnetic field). As shown in FIG. 3, two magnetic field generating coil devices 1 and 19 are arranged on a top plate table 500 of a case 50 so as to face left and right.

In the case 50, a cooling device 51,
A vacuum exhaust device 52, a control unit 53 of the cooling device 51 and the vacuum exhaust device 52, and various pipes (not shown) are housed integrally. The cooling device 51 is a GM refrigerator, and the evacuation device 52 includes an oil rotary pump used as a roughing vacuum pump and a turbo molecular pump used as a high vacuum pump.

Coil unit 2 in magnetic field generating coil device 1
The refrigerant container 3 and the refrigerant container 3 are both annular in shape, and the inner space of the refrigerant container 3 is a magnetic field generation space. In this magnetic field generating space, a superconductor 591 cooled by the cooling device 51 and stored in the vacuum heat insulating container 59 is arranged. The superconductor 591 is magnetized by a magnetic field from the magnetic field generating coil device 1.

The superconductor 591 contains 15% by weight of Ag.
An Sm-Ba-Cu-O system prepared by a melting method by adding ₂ O (silver oxide) and 0.5% by weight of Pt (platinum) was used.
The size is a column with a diameter of 36 mm and a height of 16 mm. The superconductor 591 was reinforced by stellen wrestling and stycasting (not shown) in order to prevent cracks due to cooling and electromagnetic force. This superconductor 591 is disposed inside a vacuum heat insulating container 59 communicating with the cooling device 51, and is attached to the tip of a cold head 593 inside the vacuum heat insulating container 59 via an internal yoke 592 as shown in FIG. 1. .

As shown in FIG. 1, an outer yoke 40 made of a fermented body made of permendur is arranged in the coil portion 2 so as to face the superconductor 591. A description will be given of a detachable member for detachably installing the external yoke 40 with respect to the coil unit 2.

As shown in FIG. 1 and FIG.
The ring-shaped base plate 4 is provided on the vacuum insulation container 59 side.
A ring-shaped fixing plate 41 is disposed on the other side of the refrigerant container 4 as shown in FIGS. As shown in FIG. 4, the fixing plate 41 is provided with a punched hole 410 for weight reduction.

As shown in FIG. 1, the base plate 43 is provided with a stud bolt 44 on a fixing portion 224 provided on the coil portion 2.
Is connected to the vacuum insulated container 59 by screwing. In addition, between the outer edge of the base plate 43 and the outer edge of the fixed plate 41, the external yoke 40 and the entire fixed plate 41 are separated from the coil portion 2 by overcoming the attractive force of the superconductor 591 magnetized after magnetization. A detaching bolt 42 is provided as a detachable member. A notch is provided at the center of the removal bolt 42 so that the bolt can be easily rotated with a spanner or the like.

The fixing plate 41 side of the removal bolt 42 is a round bar with steps so that the fixing plate 4 can rotate.
1 is screwed on the base plate 43 side and screwed into the base plate 43. When the removal bolt 42 is turned, the fixing plate 41 is separated from the base plate 43.

The external yoke 40 is fixed to the center of the fixing plate 41 by fixing bolts 401, and the fixing plate 41 is fixed to the fixing portion 223 of the coil unit 2 by fixing bolts 411. The opposite side of the surface of the outer yoke 40 facing the superconductor 591 is a convex portion, and is configured to be flush with the surface of the fixed plate 41.

Next, the coil section 2 will be described. FIG.
As shown in FIG. 9, the coil portion 2 is configured by winding a coil winding 22 around a stainless steel bobbin 21 for 112 turns, and the bobbin 21 has a hollow mandrel 23 having a hollow inside. It is composed of flange portions 221 and 222 provided at both ends of the mandrel 23, respectively. As shown in FIG. 6 (a), a coil winding 22 is wound around the mandrel 23, and a tubular member is formed outside the coil winding 22 via a filler 20 made of stycast having high thermal conductivity. The cover 25 is arranged.

As shown in FIGS. 6, 7 and 8, fixing portions 223 and 224 for fixing the refrigerant container 3 to the coil portion 2 are provided on the flange portions 221 and 222, respectively. The fixed portions 223 and 224 are configured so that the coil portion 2 is supported at a desired position from outside. The fixing portions 223 and 224 are shown in FIG.
As shown in FIG. 7, four protruding portions are provided for the flange portions 221 and 222. As shown in FIG. 7A, four protruding portions are provided at equal intervals in the circumferential direction of the bobbin 21.

Further, as shown in FIG.
23 and 224 are provided with screw holes 225 and 226 for screwing the fixing screw 411 and the stud bolt 44 described above. As shown in FIGS. 8A and 8B, four filling holes 250 for the filling material 20 and one terminal hole for passing the conductor of the coil winding are provided on the side surface of the cylindrical cover 25. It is provided.

Next, the refrigerant container 3 will be described.
As shown in FIGS. 1 and 6, the refrigerant container 3 is of a ring type.
An opening 30 as shown in FIG.
For 0, a coolant injection port 31 having a circular cross section as shown in FIG. 6B is provided. A heat insulating material (not shown) is wound around the refrigerant container 3 to minimize the evaporation of the refrigerant.

As described above, one end of the stat bolt 43 is fixed to the fixing portion 224 of the coil portion 2, and the other end is fixed to the fixing portion 594 provided on the side surface of the vacuum heat insulating container 59. Further, as shown in FIG. 5, the refrigerant container 3 is fixed to the fixing portions 224, 223 of the coil portion 2. Therefore, the refrigerant container 3 and the coil portion 2 are connected via the stud bolts 44.
Is detachably supported on the vacuum insulated container 59.

To explain the assembly of the coil part 2, the coil winding 22 is wound around the mandrel 23 of the bobbin 21, and then the cylindrical cover 25 is fitted on the outer periphery of the bobbin 21 and welded. From the outside of the cylindrical cover 25, the filling holes 250
The stycast, which is the filler 20, is injected through the through hole and solidified. Next, the filling hole 250 is closed by welding with a stainless steel cover of the same material as the cylindrical cover. Thereby, the coil winding 22 is substantially sealed, and the coil portion 2 is completed.

As shown in FIG. 6 (a), the lower body 311, the outer cylinder 313, and the inner cylinder 31 of the refrigerant container 3 are welded.
2. Assemble the refrigerant inlet 31 integrally with the refrigerant container 3
Is formed on one side of the lower part. Next, coil part 2
After the above-mentioned one side portion is assembled at a predetermined position of the coil portion 2 so that the fixing portion 224 of the coil portion 2 is exposed to the outside of the refrigerant container 3, the two portions are welded. Finally, the upper body 31 of the remaining cooling container 3
4 is assembled to the coil part 2 and welded to one side of the cooling vessel 3.

The volume of the coil section 2 according to this embodiment is 5
In 47cm ^3, the internal volume of the refrigerant vessel 3 is 1467Cm ^3,
V1 / V2 is 2.68 times. In addition, the refrigerant inlet area S2 is 2827 mm ² , and L1 of the coil part 2 is 70 m
m and L2 are 182 mm.

In the bobbin 21 of the coil unit 2,
As shown in FIG. 8, the inner radius (R1 shown in the figure) of the cylindrical cover 25 is 70 mm, and the thickness (t shown in the figure) is 2 m.
m and tensile strength F are 520 MPa. The coil constant α of the coil unit 2 is 1.2 × 10 ⁻³ T / A.
The maximum value Imax of the current to be supplied is 4000 A. Therefore, 0.4 × (R1 / F) × (α × Ima
x) ² = 1.24 mm, 8 × (R1 / F) × (α × Im
ax) ² = 24.8 mm, and the thickness t of the tubular cover 25 is between the two values.

Next, the operation of the magnetic field generating coil device 1 will be described. The operation switch of the vacuum evacuation device 52 is turned ON, and the inside of the vacuum insulated container 59 is evacuated to a high vacuum. Next, the operation switch of the cooling device 51 is turned on to cool the cold head 593 to 32K or less.

At the same time, liquid nitrogen is injected into the refrigerant container 3,
After cooling the coil unit 2 to 77K, a pulse current is supplied to the coil unit 2 from a pulse power supply (not shown). The superconductor 591 is magnetized by the generated pulse magnetic field.

After the magnetization is completed, the magnetic field generating coil device 1 is removed from the vacuum insulation container 59 by the following procedure. A strong attractive force acts between the outer yoke 40 and the superconductor 591. First, after removing the fixing bolt 411,
By turning the removal bolt 42, the outer yoke 40 and the fixing plate 41 are separated from the facing superconductor 591. The nuts of the stud bolts 44 are removed, and the coil unit 2 together with the refrigerant container 3 and the base plate 43 is removed from the vacuum heat insulating container 59. Thus, the excitation of the superconducting magnet device 5 by the magnetic field generating coil device 1 is completed.

The operation and effect of the magnetic field generating coil device 1 according to this embodiment will be described. Magnetic field generating coil device 1 of this example
Satisfies the relationship of V1 / V2 = 2.68 between the internal volume V1 of the refrigerant container 3 and the volume V2 of the coil unit 2.
For this reason, since sufficient refrigerant exists in the coil part 2, the coil part 2 can be cooled sufficiently and a magnetic field can be generated stably. In addition, excessive evaporation of the refrigerant hardly occurs, which is economical. Since the size of the refrigerant container 3 is not increased more than necessary, the size of the apparatus is compact and the handling is easy. Further, since the refrigerant inlet 31 is provided for the opening 30, the operation of injecting the refrigerant is easy and safe.

The area S of the refrigerant inlet of the refrigerant container 3 is 2
In 827mm ^2, it is less than or equal to the size of 10 mm ² or more L1 × L2. Therefore, it is easy to inject the refrigerant into the magnetic field generating coil device 1 of the present example, and the device size is compact and easy to handle.

The flange portions 221 and 221 of the bobbin 21
Since the fixing portions 223 and 224 provided on the fixing portion 22 fix the refrigerant container 3 to the coil portion 2 and fix the coil portion 2 to the vacuum heat insulating container 59, an impact upon energization does not directly reach the refrigerant container 3. Therefore, the weight of the refrigerant container 3 can be reduced. Further, heat intrusion from the outside of the refrigerant container 3 into the coil portion 2 can be minimized. Also, the fixing part 22
3, 224 are provided in a direction parallel to the central axis direction of the coil portion 2, and the fixing portions 223, 224 can fix the coil portion 2 in a form receiving a compressive force or a tensile force. For this reason, the fixed portions 223 and 224 can be reduced.

The external yoke 40 is detachably mounted on the magnetic field generating coil device 1 via a detachable bolt 42 as a detachable member, so that when the superconductor 591 is magnetized, the external yoke 40 is removed. Can be easy. The thickness t of the cylindrical cover 25 is set to 0.4 ×
(R1 / F) × (α × Imax) ² -8 × (R1 / F)
Since it is within the range of × (α × Imax) ² , the coil portion 2 is hardly damaged when a pulse current is applied.

As described above, according to this embodiment, it is possible to provide a magnetic field generating coil device which is easy to handle, has a low refrigerant cost, and is excellent in safety. Although the refrigerant container 3 of this example is cylindrical as shown in FIG. 2A, the same effect can be obtained by forming it as a square as shown in FIG. 2B.

Embodiment 2 In this embodiment, as shown in FIG.
The magnetic field generating coil device 1 is configured in a certain direction. In the magnetic field generating coil device 1 of the present example, the fixing portion 223 is provided only on the flange 221 of the bobbin 21. There is nothing on the side of the flange 222. The opening 30 has a coolant inlet 31 extending obliquely from the opening 30. The coolant inlet 31 is provided so as to open outside a plane M1 including an end surface perpendicular to the central axis M0 of the coil portion 2 and outside a cylindrical surface M2 including an outer peripheral surface of the coil portion 2.

The magnetic field generating coil device 1 according to this embodiment
In the above, the removal bolt 42 is provided with a hexagonal hole at the tip end side, and a hexagon wrench is inserted into the hexagonal hole so that the removal bolt 42 can be easily rotated. The terminal portion 29 is arranged from the opening 30 to the coolant inlet 31 and is configured so that wiring from an external power supply (not shown) can be easily attached and detached with bolts and nuts. Other details have the same structure as the first embodiment.

In the magnetic field generating coil device 1 of this embodiment, since the refrigerant inlets 31 are arranged in the above-described positional relationship, the magnetic field generating coil device 1 can be used at any angle from the vertical direction to the horizontal direction while being cooled by the refrigerant. be able to. Other details are the same as those of the first embodiment, and have the same functions and effects.

Embodiment 3 In this embodiment, as shown in FIG.
This is a magnetic field generating coil device 1 having a structure provided with a solid solenoidal coil portion 2. A refrigerant inlet 31 is provided in the opening 30 of the refrigerant container 3 and opens outside a plane M1 including an end surface perpendicular to the central axis M0 of the coil portion 2 and outside a cylindrical surface M2 including an outer peripheral surface of the coil portion 2. is there. Also,
The terminal portion 29 to which the coil winding 22 is connected is arranged outside the refrigerant container 3.

The fixed part 223 of the coil part 2 is provided on one side of the coil part 2 in a direction parallel to the central axis.
Is fixed here to the coil portion 2, and the fixing portion 223 is exposed to the outside of the refrigerant container 3.

The magnetic field generating space in the magnetic field generating coil device 1 of this embodiment is a space near the magnetic flux line G in FIG.
Place. The coil unit 2 is disposed in the refrigerant container 3 so as to be closest to the wall surface 309 closest to the magnetic field generation space. There is only a gap between the two so that the refrigerant can pass through. Other details are the same as those of the magnetic field generating coil device 1 described in the first embodiment, and have the same functions and effects. The magnetic field generating coil device 1 according to the present embodiment can be used as a general-purpose magnetic field generating source.

Fourth Embodiment As shown in FIG. 12, the present embodiment employs a
The magnetic field generating coil device 1 has a configuration in which a solenoid-shaped coil portion 2 is disposed in a space, and an external yoke 60 is disposed in a space of an inner peripheral portion of the refrigerant container 3. Also, the fixing part 22 of the coil part 2
3 is provided on one side of the coil section 2 in a direction parallel to the central axis,
Here, the cooling container 3 is fixed to the coil portion 2, and the fixing portion 223 is exposed to the outside of the refrigerant container 3.

The magnetic field generating space in the magnetic field generating coil device 1 of this embodiment is a space in the vicinity of the magnetic flux lines G shown in FIG.
Place. The coil unit 2 is disposed in the refrigerant container 3 so as to be closest to the surface 309 closest to the magnetic field generation space. There is only a gap between the two so that the refrigerant can pass through.

The external yoke 60 is fixed by a fixing nut 611 to a fixing plate 61 disposed on the side of the refrigerant container 3 opposite to the magnetic field generating space. At this time, the surface 609 of the outer yoke 60 and the surface 309 of the refrigerant container 3 on the magnetic field generation space side are aligned. The fixing plate 61 is detachably fixed to a fixing bolt 621 inserted into a fixing portion 223 provided on the flange 221 of the coil portion 2 by a fixing nut 623 with a removal nut 622 interposed therebetween.

In order to remove the external yoke 60 in this configuration, the fixing nut 623 is loosened, and when the removing nut 622 is turned, the fixing plate 61 is separated from the coil portion 2 and separated from the coil portion 2 together with the external yoke 60. Can be. Other details are the same as those of the magnetic field generating coil device 1 described in the first embodiment, and have the same functions and effects.
The magnetic field generating coil device 1 according to the present embodiment can be used as a general-purpose magnetic field generating source.

Embodiment 5 In this embodiment, as shown in FIG. 13, a solid solenoid-shaped coil portion 2 is disposed in a cylindrical refrigerant container 3 so as to face a surface 309 of the refrigerant container 3 on the magnetic field generation space side. The magnetic field generating coil device 1 has a configuration in which an external yoke 60 is disposed at a position where the magnetic field is generated. In this example, a space is provided between the outer yoke 60 and the surface 309 such that the magnetic field target 599 can be arranged. The fixing portion 223 of the coil portion 2 is provided on one side of the coil portion 2 in a direction parallel to the central axis, and fixes the cooling vessel 3 to the coil portion 2 here.
Is in a state exposed to the outside of the refrigerant container 3.

The magnetic field generating space in the magnetic field generating coil device 1 of this embodiment is a space near the magnetic flux line G in FIG. The coil section 2 is disposed in the refrigerant container 3 so as to be closest to the surface 309 closest to the magnetic field generation space. There is only a gap between the two so that the refrigerant can pass through.

The external yoke 60 is fixed to a fixing plate 61 provided on the side of the magnetic field generating space of the refrigerant container 3 by fixing bolts 611. A base plate 65 is disposed on the side of the refrigerant container 3 opposite to the magnetic field acting space. The base plate 65 is fixed to the fixing part 223 of the coil part 2 by stud bolts 652. The fixing plate 61 is detachably fixed to the base plate 65 via a detachment bolt 651.

A notch is provided at the center of the removal bolt 651 so that the bolt can be easily rotated with a spanner or the like. By rotating the removal bolt 651, the external yoke 60 and the fixing plate 61 are moved together with the superconductor 5.
91 can be separated. Other details are the same as those of the magnetic field generating coil device 1 described in the first embodiment, and have the same functions and effects. The magnetic field generating coil device 1 according to the present embodiment can be used as a general-purpose magnetic field generating source.

[0083]

As described above, according to the present invention, it is possible to provide a magnetic field generating coil device which is easy to handle, has a low refrigerant cost, and is excellent in safety.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view of a main part of a magnetic field generating coil device according to a first embodiment.

FIG. 2 is an explanatory diagram showing a refrigerant inlet area and L1 and L2 in a refrigerant container in the first embodiment.

FIG. 3 is an explanatory diagram of a superconducting magnet device according to the first embodiment.

FIG. 4 is an explanatory diagram of the magnetic field generating coil device according to the first embodiment as viewed from a fixed plate side.

FIG. 5 is an explanatory diagram of the magnetic field generating coil device according to the first embodiment as viewed from a base plate side.

6A and 6B are explanatory diagrams of a cross section of the magnetic field generating coil device (A1-O1-A2 cut surface in FIG. 5) and (b) a refrigerant injection port in the first embodiment.

7A is a plan view of a bobbin, and FIG. 7B is an explanatory cross-sectional view of the bobbin according to the first embodiment (B in FIG. 7A).
1-O2-B2 cut surface).

8A is a plan view of a tubular cover of a bobbin, and FIG. 8B is a side view of the tubular cover of the bobbin.

FIG. 9 is a perspective developed view of the bobbin in the first embodiment.

FIG. 10 is an explanatory sectional view of a magnetic field generating coil device according to the second embodiment.

FIG. 11 is an explanatory sectional view of a magnetic field generating coil device having a terminal portion outside a refrigerant container in a third embodiment.

FIG. 12 is an explanatory sectional view of a magnetic field generating coil device according to a fourth embodiment in which an external yoke is arranged in a space on the inner peripheral side of a refrigerant container.

FIG. 13 is an explanatory cross-sectional view of a magnetic field generating coil device according to a fifth embodiment, in which an external yoke is arranged at a position facing a magnetic field acting space.

[Explanation of symbols]

 1. . . 1. magnetic field generating coil device; . . Coil part, 21. . . Bobbin, 22. . . Coil winding, 29. . . Terminal part, 3. . . Refrigerant container, 30. . . Opening, 31. . . Refrigerant inlet, 40. . . Outer yoke,

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masaaki Yoshikawa 5-50, Hachigencho, Kariya-shi, Aichi Pref. Inside the Imura Materials Development Laboratory (72) Inventor Tetsuo Oka 5-50, Hachigencho, Kariya-shi, Aichi Address Inside Imla Materials Development Laboratory Co., Ltd.

Claims (12)

[Claims] 1. A magnetic field generating coil device comprising a coil portion for generating a magnetic field by energization stored in a refrigerant container,
The coil unit includes a bobbin and a coil winding wound around the bobbin. The refrigerant container has an opening and a refrigerant inlet formed with respect to the opening. V1 and the volume V2 of the coil portion, the ratio V1 / V2 of the two is in the range of 1.5 to 10, and the coolant inlet area S [mm ² ] is in the central axis direction of the coolant container. When the maximum thickness along the axis is L1 [mm] and the maximum length in the radial direction perpendicular to the central axis is L2 [mm], 10 ≦ S ≦
(L1 × L2). A magnetic field generating coil device. 2. The coil according to claim 1, wherein the coil comprises a bobbin formed of a mandrel and flanges provided at both ends of the mandrel, a coil winding wound around the outer periphery of the mandrel, A cylindrical cover disposed outside the wound coil winding; a fixing portion for fixing the coil portion to the refrigerant container is provided on the flange portion; Wherein the magnetic field generating coil device is configured to be supported at a desired position. 3. The magnetic field generating coil device according to claim 2, wherein the fixing portion is provided in a direction parallel to a center axis direction of the coil portion. 4. The method according to claim 1, wherein:
The magnetic field generating coil device according to claim 1, wherein the coil portion has a terminal portion for electrically connecting a coil winding to an external power supply, and the terminal portion is disposed at a refrigerant inlet of the refrigerant container. . 5. The method according to claim 1, wherein:
The coil unit has a terminal unit for electrically connecting a coil winding to an external power supply, and the terminal unit is provided outside the refrigerant container. 6. The method according to claim 1, wherein:
The refrigerant injection port is provided so as to open to the outside of the refrigerant container outside a plane including an end surface perpendicular to a central axis of the coil portion and outside a cylindrical surface including an outer peripheral surface of the coil portion. Characteristic magnetic field generating coil device. 7. The refrigerant container according to any one of claims 1 to 6, wherein the coil portion is located closer to an inner wall of the refrigerant container so that a strong magnetic field action space is formed outside the refrigerant container. A magnetic field generating coil device, wherein the magnetic field generating coil device is arranged so that: 8. The method according to claim 1, wherein:
The magnetic field generating coil device has an external yoke, and the external yoke is detachably attached to the coil portion via a detachable member with respect to the magnetic field generating coil device. 9. The method according to claim 1, wherein:
The magnetic field generating coil device has an external yoke, and the external yoke is detachably mounted to the magnetic field generating coil device together with the coil portion via a detachable member with respect to a base portion fixed to the refrigerant container. A magnetic field generating coil device, characterized in that: 10. The magnetic field generating coil device according to claim 8, wherein the detachable member has a screw structure. 11. The magnetic field generating coil device according to claim 1, wherein the coil unit is configured to generate a magnetic field by applying a pulse current. 12. The cylindrical cover according to claim 2, wherein the inner radius of the cylindrical cover is R1 [mm], the tensile strength is F [MPa], and the coil constant of the coil portion is α [T /
A], the maximum value of the current flowing through the coil unit is Imax
In the case of [A], the thickness t [mm] of the cylindrical cover
Is 0.4 × (R1 / F) × (α × Imax) ² ≦ t ≦
A magnetic field generating coil device, wherein a relationship of 8 × (R1 / F) × (α × Imax) ² is established.