JPH01276798A - magnetic shielding wall - Google Patents

Abstract

PURPOSE:To ease construction and make unnecessary particular processing such as reinforcement of a building by uniformly providing an amorphous sheet of given construction on the inner surface of a wall material surrounding an object to be magnetically shielded. CONSTITUTION:A magnetic shielding wall 25 surrounds peripheries of a liquid helium container 21 and a power converter apparatus 22 in a power storage facility, to form a closed space. The magnetic shielding wall 25 is constructed by mounting many concrete panels 26 by supporting outer surfaces thereof with use of double-U steel as their supporters. The panel 26 includes a rectangular precast concrete plate 28 and a magnetic shielding structure 29 uniformly provided on the surface of the concrete plate 28 directed to the container 21. The magnetic shielding structure 29 is formed by laminating an amorphous sheet 12 or a plurality of sheets 12. The sheet 12 is formed by uniformly dispersing metal 13 between films 14, 14 and fixing the same with an adhesive and the like.

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention blocks the influence of the magnetic field generated by a magnetic generating body such as a superconducting magnet on the surrounding area, or the influence of fluctuations in geomagnetism etc. on various devices. This relates to a magnetic shielding wall for

"Conventional technology" When considering the influence of magnetism, the influence that a magnetic generating body has on the surrounding environment, such as the human body or electronic equipment (active influence)
For example, reinforcing bars, steel frames, and elevators that make up buildings.
1. There is an influence (passive type 9) that ferromagnetic materials such as automobiles have on the uniform magnetic field, and in order to cut off these magnetic influences, several magnetic shielding measures have been taken in the past.

Magnetic shielding means include: 1) Room shield type: The entire room is covered with a magnetic shield; 11) Self-enclosed type: Surrounds only the magnetic generator with magnetic material (magnetic shield). It can be broadly divided into Shino and . In any of these magnetic shielding means, iron plates are often used as the magnetic shielding body.

``Problems to be Solved by the Invention'' However, the conventional magnetic shielding means has the following disadvantages when housing a magnetic generator that generates a strong magnetic field.

That is, for example, MRI (Magnetic Re
sonanceImaging: magnetic resonance imaging) device, θ, 5 to 2. When attempting to perform magnetic unruling on a magnetic generator that generates a magnetic field as strong as θT (Tesla), the thickness of the iron plate serving as the magnetic shield must be made thicker (usually 2Emm) in order to prevent this strong magnetic field from leaking to the outside. degree), and for this reason, the total weight of the iron plates normally used may reach 50 or more.

Therefore, it is necessary to strengthen the structure that supports the magnetic shield, and construction requires a great deal of labor. Moreover, when constructing such thick steel plates, special equipment and jigs such as lifting equipment, jacking equipment, hanging fittings, shim liners, etc. are required, and the cost required for these incidental works is also enormous. For example, in the magnetic shield of Ml' (I device, the seam spacing between iron plates is 3IIL).
Magnetic leakage is said to be no problem if it is less than 11, which requires high precision in both the processing and construction of the steel plate, and the inspection process for this is also added, causing an increase in costs.

This invention was made in view of the above circumstances, and it not only has complete magnetic shielding ability, but also is easy to construct and can be constructed at extremely low cost without taking special measures such as reinforcing the structure. The purpose of the present invention is to provide a magnetic shielding wall body that can

"Means for Solving the Problem" Therefore, the present invention provides a sheet in which flaky amorphous metal is sandwiched between films at least on the inner and outer surfaces of a wall material provided to surround an object to be magnetically shielded from the outside. The above problem is solved by configuring a magnetic shielding wall body in which amorphous sheets formed into a shape are uniformly provided.

"Embodiments" Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 4 is a first embodiment of the present invention, and is a diagram showing an example in which the present invention is applied to a magnetic shielding wall of an electromagnetically propelled ship. In this figure, reference numeral 1 is an annular superconducting coil formed in the shape of an ellipse (race track), which is installed at the bottom of the electromagnetic propulsion ship. It is housed in a closed container 2. A current is appropriately supplied to this coil l via a current supply line 4. Reference numeral 5 indicates a helium bottle with an adiabatic structure in which liquid helium 3 is stored, and reference numeral 6 indicates a refrigerator, and a condenser 7 of this refrigerator 6.
The portion is provided above the inside of the closed container 2. Reference numeral 8 denotes an electrode protruding into the sea from the bottom of the electromagnetic propulsion ship, and positive and negative electrodes are provided as a pair at a predetermined interval. A voltage is applied to this electrode 8 via a control device 9 .

The closed container 2 is surrounded by a magnetic shielding wall 10 except for the bottom portion thereof.

This magnetic shielding wall lO has a structure in which magnetic shielding bodies 11 are uniformly provided on the inner surface of a thin iron plate (shown in the figure) used for a bulkhead of a normal ship's hull, etc., and this magnetic shielding body II is shown in FIG. It is constructed by stacking one amorphous sheet 12 or a plurality of amorphous sheets 12 to a predetermined thickness as shown in FIG.

As shown in FIG. 2, the amorphous sheet 12 is made of flaky amorphous metal 13 and two films 14.
14 in a sorted manner. As is well known, amorphous metal is an amorphous metal in which atoms are arranged irregularly without a regular lattice structure, and is produced by means such as rapid cooling of a melt, electrodeposition, vapor deposition, and sputtering. Because of their unique atomic structure, amorphous metals have various characteristics not found in conventional materials. Among them, cobalt-based alloys exhibit high magnetic permeability and low coercivity that exceed permalloy, and are therefore highly magnetic. Ideal as a shielding material.

For example, according to the results of trial production by the present inventors, the magnetic permeability μ of the amorphous sheet 12 is 5 to 8 times higher than that of an iron plate, which is a conventional magnetic shield.

The amorphous sheet 12 is the film I4.1
A required amount of the amorphous metal 13 may be uniformly dispersed between the wafers 4 and 4 and fixed with a film 14, 14. As a fixing means, an appropriate method such as an adhesive or a hot melt method can be used. If the film t+i is made of synthetic resin such as acrylic resin, vinyl chloride, Evoquin resin, or phenol resin, it will be flexible and extremely effective. However, it is also possible to use glass.

Alternatively, if one of the two films 14.14 is made of a normal interior material, the magnetic shielding wall 1
The aesthetic appearance of the inner surface of 0 is improved, and the step of providing the amorphous sheet 12 and the step of interiorizing the magnetic shielding wall 10 can be used simultaneously, making it very efficient. Here, when laminating a plurality of amorphous sheets 12, a magnetic shielding wall lO
Only the amorphous sheet 12 exposed on the inner surface may be used also as an interior material.

The amorphous sheet 12 in this embodiment has a width of approximately θ
It is formed into a long sheet with θCff1, and amorphous metal 13 is used at θ, 2E kg/m”, and sheet 1
The thickness of the sheet is about θ, Erntn's. This amorphous sheet 12 is formed into the magnetic shielding body 11 either as it is or by laminating a plurality of sheets to have a predetermined thickness, and then is provided on one surface of the thin iron plate so as to form a uniform plane.

By the way, as mentioned above, the amorphous sheet 12 has a relatively thin thickness of about θ, Et*m. Therefore, in order to magnetically shield a strong magnetic field generator, a plurality of amorphous sheets are laminated and placed in a predetermined manner as necessary. It is preferable that the magnetic shield 11 be thick. Furthermore, since the sheet 12 itself is formed to have a predetermined width as described above, the sheets must be joined together to uniformly cover one surface of the thin iron plate. Therefore,
When trying to obtain the desired magnetic shielding effect using the amorphous sheet 12, it is necessary to minimize the formation of gaps at the joints (i.e., to reduce magnetic resistance).
There is a need. 3 and 4 show an example of a seam processing method, in which the amorphous sheets 12 are provided in double layers so that the seams are alternately formed;
In the case shown in FIG. 4, an amorphous sheet 12a cut to a width sufficient to cover the joint is pasted to the joint so as to reduce magnetic resistance.

Although magnetic leakage from the joints can be blocked by any of the methods, in the method shown in FIG. 4, since the amorphous sheet 12 is formed in two layers, a higher overall magnetic shielding effect can be expected. . As explained above, the amorphous sheet 12 can be used by stacking it in multiple layers, thereby easily achieving the desired magnetic shielding effect.

Therefore, according to the electromagnetic propulsion ship having the above configuration, current is supplied to the superconducting coil l cooled to an ultra-low temperature by liquid helium 3 to excite the coil l, which causes the ship to move downward. If a strong magnetic flux is generated and a voltage is applied to the electrode 8 to cause a current to flow through the seawater directly below the electrode 8, the magnetic flux and current will generate a Lorentz force that pushes the seawater backwards.

Therefore, the electromagnetic propulsion vessel receives a force that propels it forward due to the reaction from the seawater, and moves in a predetermined direction on the sea surface.

At this time, the area around the superconducting coil 1 is covered with a magnetic shielding wall 10 except for the bottom part, and this magnetic shielding wall 10 has magnetic shielding bodies 11 uniformly provided on the inner surface of a thin iron plate. This superconducting coil 1 is uniformly covered by a magnetic shield 11. Therefore, the strong magnetic flux generated by the superconducting coil l runs through the magnetic shield 11 on the inner surface of the magnetic shielding wall 10 and does not leak outside the magnetic shielding wall 10, and the magnetic field around the superconducting coil 1 is made uniform. magnetic shielding is achieved.

This magnetic shield 11 is made of an amorphous sheet 12.
Therefore, the weight of the entire magnetic shielding wall can be significantly reduced compared to conventional magnetic shielding using thick iron plates.

That is, as mentioned above, the magnetic permeability μ of the amorphous sheet 12 is E-8 times that of the iron plate, so the plate thickness required to obtain the same magnetic shielding performance is I/E to I/8 of the iron plate.
Therefore, the thickness of the magnetic shield 12 can be made extremely thin. Therefore, it is possible to significantly reduce the weight of the magnetic shielding wall 10 itself including the magnetic shielding body 11, and unlike electromagnetic propulsion ships that use thick iron plates for the conventional magnetic shielding body, Magnetic shield 11 on the part
There is no need to perform equivalent structural reinforcement other than this, and it becomes possible to reduce the weight of the electromagnetic propulsion vessel itself, and the structure of the electromagnetic propulsion vessel itself can be simplified. .

Moreover, this magnetic shielding body 11 is made of the amorphous sheet 12 as described above, and this amorphous sheet 12 is highly flexible and easy to bend and cut.
In addition, since it can be bonded, it is extremely easy to uniformly provide it on the thin iron plate without any gaps, and a perfect magnetic shielding effect can be expected. In addition, the process of providing the magnetic shield 11 on the thin iron plate is a simple process such as cutting the amorphous sheet 12 and gluing 5, and does not require any special equipment or equipment, resulting in labor savings and work during construction. Safety can be achieved.

Therefore, according to this embodiment, the magnetic shielding wall 10 is easy to construct and can be constructed at extremely low cost without taking any special measures such as reinforcing the structure of the electromagnetic propulsion ship. It can be realized.

Next, FIG. 5 is a diagram showing a second embodiment of the present invention, in which the present invention is applied to a magnetic shielding wall of a power storage facility.

In the figure, reference numeral 20 denotes a solenoid-shaped superconducting coil, and as in the first embodiment, this coil 20 is immersed in liquid helium (not shown) in a liquid helium container 21 having an adiabatic structure. It is stored. Reference numeral 22 is a power converter that extracts the DC current stored in the coil as AC power, and reference numeral 23 is a cooling equipment for cooling the liquid helium. The surroundings of the liquid helium container 21 and the power converter 22 are similar to the first embodiment.
The entire space is surrounded by a magnetic shielding wall 25, making it a closed space.

This magnetic shielding wall 25 is constructed by attaching a large number of concrete panels 26 as shown in FIG. 6, the outer surfaces of which are supported by a section steel 27 serving as a support.

As shown in FIG. 6, the concrete panel 26 includes a precast concrete plate 28 formed into a flat plate with an approximately rectangular outer shape, and one surface of both surfaces of the precast concrete plate 28 facing the liquid helium container 2'1. The magnetic shielding body 29 is generally constructed of a magnetic shielding body 29 provided uniformly on the magnetic shielding member 29 .

The precast concrete plate 28 has stepped portions 28b, 28b each having a substantially rectangular cross section on its four side edges.

... are formed respectively. Further, the stepped portions 28b, 28b formed on two adjacent sides of the four sides of the precast concrete plate 28 are formed on the same side surface of the precast concrete plate 28, and are also formed on the opposite sides of the precast concrete plate 28. The stepped portions 28b, 28b formed on the two sides are formed on different sides of the precast concrete plate 28, respectively. A notch 2 is provided at the corner of the precast concrete plate 28 where the step portions 28b, 28b formed on different sides are in contact.
8a is formed.

On the other hand, the magnetic shield 29 is constructed by laminating one amorphous sheet 12 or a plurality of amorphous sheets 12 to a predetermined thickness, as in the first embodiment. This amorphous sheet 12 is made into a magnetic shielding body 29 by the same means as in the first embodiment, either as it is or by laminating a plurality of sheets to a predetermined thickness.
It is provided on one surface of the precast concrete plate 28 so as to form a uniform plane. In this embodiment, as a means for arranging the magnetic shield 29, the inner surface of the precast concrete plate 28 is finished into a uniform flat surface with extremely few irregularities, and the magnetic shield 29 is placed on the precast concrete plate 28.
9 was directly attached with adhesive.

Concrete panel 26.2 having the above configuration
6, . . . are land portions 28b, 28b at the edges of adjacent concrete panels 26, 26, as shown in FIG.
The magnetic shielding wall 25 is constructed by combining a plurality of magnetic shielding bodies 29 facing the liquid helium container 121 in the same direction so that the magnetic shielding bodies 29 are alternately arranged.

Here, a slight gap may sometimes occur between the concrete panels 26, 26, . The gap may be closed by pasting a magnetic shielding piece 292L having a thickness of - and -. In this case, as shown in FIG. 8, if the end of the magnetic shield 29 is cut and the magnetic shield piece 29a is fitted into the cut part, the inner surface of the magnetic shield wall 25 will be flush. It is preferable in terms of appearance. Alternatively, the adjacent step portions 28b, 2
A magnetic shield 29 may be inserted between 8b.

The magnetic shielding wall 25 having such a structure is provided with an entrance/exit door as shown in FIGS. 9 and 10. The same reference numerals indicate the same components.

Reference numeral 31 is a door, and 32 is a hinge. On the inside of the door 31,
An amorphous sheet 12 similar to that described above is attached. Further, a narrow amorphous sheet 12b is also provided in the gap formed between the door 31 and the magnetic shielding wall 25, so that magnetic leakage is completely prevented.

Therefore, according to the magnetic shielding wall 25 having the above configuration, since the magnetic shielding body 29 is uniformly provided on the inner surface of the concrete panel 26 constituting this wall, the magnetic shielding wall 25 has a magnetic shielding body 29 on the inner surface. The shields 29 are uniformly provided. As a result, the strong magnetic field generated by the superconducting coil 21 does not leak outside the magnetic shield wall 25, and magnetic noise from the outside is shielded by the magnetic shield 29 and does not reach the inside of the room l. Therefore, in this embodiment, the same effects as in the first embodiment can be obtained.

In particular, in this embodiment, since the magnetic shield 29 can be constructed to be thin as described above, the concrete panel 26 itself including the magnetic shield 29 can be significantly reduced in size. Therefore, as the weight of the concrete panel 26 is reduced, it is also possible to increase the size of the concrete panel 26. Therefore, the number of panels can be significantly reduced compared to the conventional RANO, and the locations where there is a risk of magnetic leakage are greatly reduced. magnetic shielding wall 25, easy to maintain, and magnetic shielding wall 25
This has the excellent effect of providing excellent earthquake resistance.

On the other hand, since the magnetic shielding body 29 is pasted to the precast concrete plate 27 in advance to form the concrete panel 26, the process of erecting the concrete panel 26 in a predetermined position and if there is a slight gap, Magnetic shielding can be performed only by closing this gap with the magnetic shielding body 29a, and it is possible to save labor and make the work safer when constructing the magnetic shielding wall 25. Moreover, since the magnetic shield 29 is made of the amorphous sheet 12, the process of pasting the magnetic shield 29 on the precast concrete plate 27 is simple, and from this point of view as well, the work is labor-saving. be able to.

Similarly, since the amorphous sheet 12 is attached to the inner surface of the door 31 of this embodiment, the weight of the door 31 itself can be significantly reduced compared to a conventional door made of thick iron plate. This eliminates the need to place a large burden on the magnetic shielding wall 25 that supports the door 31, so from this point of view as well, the structure of the magnetic shielding wall 25 can be simplified, and the structure of the hinge 32 can also be simplified. It can be made into something. Furthermore, by making the door 31 lighter, workability is improved, and operability such as opening/closing operations is dramatically improved, and the door 31 can also be made larger, making it easier for large equipment/equipment and operators to enter and exit. .

Note that the power storage equipment is not limited to equipment using a solenoid-type superconducting coil 21 as in the second embodiment.
Of course, it is also possible to use a facility in which a superconducting coil is formed into a toroid shape.

That is, in the third embodiment, a plurality of superconducting coils formed in an annular shape are prepared, and the coils are arranged in an annular shape as a whole with their centers arranged on the same circumference. Each of these coils is housed in an airtight container with a heat-insulating structure in which liquid helium is stored. The plurality of closed containers are surrounded by a magnetic shielding wall as in the second embodiment. The detailed structure of this magnetic shielding wall is the same as that of the second embodiment, so its explanation will be omitted.

Therefore, this embodiment also provides the same effects as those of the first and second embodiments.

Furthermore, in the second and third embodiments, the concrete panels 26 are combined to constitute the magnetic shielding wall 25;
The configuration of the magnetic shielding wall 25 is not limited to these embodiments, and the magnetic shielding wall 25 may be configured by, for example, uniformly attaching the magnetic shielding body 29 as described above to the inner surface of cast-in-place concrete. Needless to say.

Alternatively, as shown in FIG. 11, a panel 42 made of, for example, synthetic resin is supported by metal fittings 41 on the cast-in-place concrete wall 40 at a position slightly apart from the inner surface of the cast-in-place concrete wall 40. A plurality of amorphous sheets 12 are provided on the surface of the panel 42 so as to cover the panel 42.
may be attached in the same manner as above. The other configurations are the same as those of the second and third embodiments.

According to the fourth embodiment, the same effect as the second and third embodiments can be obtained, but since the amorphous sheet 12 can be bonded to the smooth panel 42, the concrete wall 40 which is the structure There is no need to finish the surface. In addition, even if the wall 40 has structural unevenness, by providing the panel 42 on the inner surface of the unevenness, the indoor wall surface can be easily configured to be flat, for example. After covering the rock excavation surface with shotcrete, the metal fittings 4 are made from this shotcrete.
If the panel 42 is attached by protruding the magnetic shield wall 1, it will greatly contribute to simplifying the construction work of the magnetic shielding wall 25. Furthermore, in the event that the amorphous notebook 12 needs to be replaced, the entire panel 42 can be replaced, making the work easier. Furthermore, it is possible to improve work efficiency by attaching the amorphous sheet 12 to the panel 42 in advance at a factory or the like. In that case, as shown in FIGS. The seam of the panel 42 can be covered by making the sheet 12 slightly protrude from one end of the panel 42 or two adjacent sides. Here, the one in FIG. 12 shows the case where the panels 42 are arranged side by side only in the horizontal direction, and the one in FIG.
This shows the case where they are connected vertically and horizontally.

FIG. 14 shows a fifth embodiment of the present invention. In the fifth embodiment, the panel 4 in the fourth embodiment is
As shown in FIG.
An insert 44 is embedded therein for inserting the. The rest of the structure is the same as that of the fourth embodiment.

According to the fifth embodiment, since the panel 42 can be freely attached and detached, the amorphous sheet 12 can be easily replaced.
By preparing in advance panels 42 with different numbers of layers and replacing them as appropriate, it is possible to easily create magnetic shielding walls 25 with different magnetic shielding abilities depending on the strength of the internal or external magnetic field. .

Further, FIG. 16 is a diagram showing a sixth embodiment of the present invention, which is applied to a magnetic shielding wall of a medical pi-meson irradiation device. In the figure, the reference numeral 50 is a proton accelerator, the reference numeral 51 is a π meson generation target placed at the end of this accelerator, and the reference numeral 52 is a shielding steel ingot placed behind this target 51, and the front end of this steel ingot 52. And at the rear, superconducting coils 53a and 53b shaped to surround this steel ingot 52.
are placed respectively. And these coils 53
a and 53b are immersed in liquid helium (the path shown in the figure) and housed in an airtight container "7454" having a heat-insulating structure, as in the previous embodiment.
a and 53 b have the effect of converging the π meson beam B generated when the protons accelerated by the accelerator 5I collide with the target 52 to a predetermined position behind the steel ingot 52 by their strong magnetic fields.

Further, reference numeral 55 denotes a coil 53 located behind the steel ingot 52.
This is a patient bed that is arranged horizontally movably behind the patient 56 and supports the patient 56. A magnetic shielding wall 57 and a magnetic shielding door 58 for entry and exit of small children are provided behind the patient bed 55. The detailed configurations of the magnetic shielding wall 57 and the magnetic shielding door 58 are the same as in each of the embodiments described above, so their explanation will be omitted. Therefore, this embodiment can also provide the same effects as those of the embodiments described above.

Furthermore, FIG. 17 shows a seventh embodiment of the present invention,
It is a figure which shows the example applied to the magnetic shielding wall of a magnetic refrigerator.

In the figure, reference numeral 61 is a support cylinder erected vertically, reference numeral 62 is a pair of magnetic bodies inserted into this support cylinder 61, and reference numeral 63 is a piston similarly inserted into this support cylinder 61. This piston 63 is reciprocated in the vertical direction by a driving means (not shown), and the magnetic bodies 62 and 62 are also reciprocated in the vertical direction along with this. Reference numeral 64 denotes a pair of superconducting coils arranged concentrically with respect to the support cylinder 6I at intervals in the length direction of the support cylinder 61. These support cylinders 61 and superconducting coils 64 are
It is immersed in liquid helium 65 and housed in a liquid helium container 66 having an adiabatic structure. The support cylinder 61
A hollow helium reservoir 68 in which helium 67 to be cooled is stored is fitted around the center of the helium reservoir 68.
A helium injection pipe 69 is connected to.

In order to cool the helium 67 with the magnetic refrigerator configured as described above, the superconducting coils 64, 64 are excited in advance by supplying current to them, and the pistons are moved by the driving means (not shown). By moving the magnetic body 63 up and down, one of the magnetic bodies 62 (in the illustrated example, the magnetic body 62 located below) is brought into the vicinity of the coil 64.

As a result, as shown in FIG. 17, a strong magnetic field from the coil 64 acts on the magnetic body 62, so that the magnetic spins of the magnetic body 62 are aligned in one direction, and the magnetic body 62 generates heat. After dissipating this heat into the liquid helium 65, when the magnetic body 62 with aligned magnetic spins is moved to near the helium reservoir 68 by the driving means, the strong magnetic field from the outside stops acting on the magnetic body 62. The magnetic spin is disturbed, and the magnetic body 62 absorbs heat from its surroundings. As a result, the helium 67 in the helium reservoir 68 is cooled and taken out from the helium injection pipe 69 when it becomes superfluid helium (absolute temperature 1.4 or lower).

Then, by injecting new helium 67 to be cooled from the injection pipe 69 into the vicinity of the helium reservoir 68 and repeating the above steps, the helium 67 can be continuously cooled.

Here, the amorphous sheet 12 described above is attached to the outer wall surface 66a of the liquid helium container 66, that is,
This helium container outer wall surface 66a is used as a magnetic shielding wall. Therefore, this embodiment can also provide the same effects as those of the embodiments described above.

Note that the configuration of the magnetic shielding wall body of the present invention is not limited to the above embodiments, and various modifications are possible. For example, as shown in FIG. 18, an angle-shaped support member 71 may be attached to the end of the amorphous sheet 12 to provide independence. In this way, by forming a portion behind the amorphous sheet 12 where no wall material is located, visibility and translucency can be ensured and maintained in this portion, which is preferable. That is, as mentioned above, since the amorphous sheet 12 is formed into a net shape by sandwiching the flaky amorphous metal 13 between two films 14 and 14, it inherently has translucency. Therefore, if part or all of the magnetic shielding wall is constructed as shown in FIG. 18, it becomes possible to observe the inside of the wall from outside while it is magnetically shielded. Alternatively, by arranging the lighting equipment behind this wall, the lighting equipment can be provided without impairing the magnetic curl effect, which is very suitable. Other examples are:
A preferred example is one in which the magnetic shielding effect is further improved by providing an amorphous sheet not only on the inner surface of the wall material but also on the outer surface.

Further, the scope of application is not limited to the above-mentioned embodiments, and various application examples are possible. - As an example, the magnetic shielding wall in each of the above embodiments was used as a magnetic shield for a superconducting coil that generates a strong magnetic field, but it is also used, for example, in an electron lens of an electron microscope.

It may be used as a magnetic shield for magnetic generators that generate relatively weak magnetic fields, such as electromagnets, or conversely, 5QU
Of course, the present invention may also be used for magnetic shielding of various devices such as ID (quantum interferometer) that are sensitive to even weak fluctuations in external magnetic fields.

"Effects of the Invention" As explained in detail above, the magnetic shielding wall according to the present invention has flakes on at least the inner surface of the inner and outer surfaces of the wall material that surrounds the object from which magnetic shielding is to be removed from the outside. It has a structure in which an amorphous sheet is uniformly formed by sandwiching amorphous metal between films, and this amorphous sheet has a higher magnetic permeability than the conventional thick iron plate that is used as a magnetic shield. Therefore, the thickness of the amorphous sheet can be made extremely thin. Therefore, it is possible to significantly reduce the weight of the magnetic shielding wall, and there is no need to place any burden on the structure that supports the magnetic shielding wall, and there is no need for large-scale construction work such as reinforcing the entire structure. This can significantly reduce costs.

Moreover, this amorphous sheet is highly flexible, easy to bend and cut, and can also be bonded.
It is extremely easy to install the amorphous sheet uniformly along the wall material without any gaps, and a complete magnetic shielding effect can be expected, and the process of installing the amorphous sheet along the wall material is simple, such as cutting and gluing. Since it does not require any special equipment or equipment, labor savings and work safety can be achieved during construction.

Therefore, according to the present invention, it is possible to realize a magnetic shielding wall that is easy to construct and can be constructed at extremely low cost without taking special measures such as reinforcing the structure. .

[Brief Description of the Drawings] Fig. 1 is an electromagnetic propulsion ship to which a magnetic shielding wall according to a first embodiment of the present invention is applied, Fig. 2 is a sectional view showing an amorphous sheet, and Figs. 3 and 4 FIG. 5 is a perspective view showing a power storage facility to which a magnetic shielding wall according to a second embodiment of the present invention is applied, and FIG. 6 shows a concrete panel. A perspective view, FIGS. 7 and 8 are both sectional views showing an example of the concrete panel installation state, FIGS. 9 and 10 are views showing a magnetic shielding door, and FIG. 9 is a cross sectional view, Box 10 is a vertical sectional view, and Figures 11 to 13 are the fourth diagrams of this invention.
11 is a cross-sectional view, FIGS. 12 and 13 are perspective views showing the panel together with an amorphous sheet, and FIGS. The figures show a magnetic shielding wall body according to a fifth embodiment of the present invention, in which Fig. 14 is a cross-sectional view, Fig. 15 is a longitudinal sectional view showing the panel together with a fitting tool and an insert, and Fig. 16 is a longitudinal sectional view. is a sectional view showing a medical pi-meson irradiation device to which a magnetic shielding wall body is applied, which is a sixth embodiment of the present invention;
FIG. 17 is a schematic front view showing a magnetic refrigerator to which a magnetic shielding wall according to a seventh embodiment of the present invention is applied, and FIG. 18 is a plan view showing a magnetic shielding wall according to an eighth embodiment of the present invention. It is a diagram. 10... Magnetic shielding wall (wall body), 12...
・Amorphous sheet, 13...Amorphous metal, 14...Film, 25...Magnetic shielding wall (wall), 28...Precast concrete plate (wall) material), 3I...magnetic shielding door (wall), 42...panel (wall material), 57...
...Magnetic shielding wall (wall), 58...Magnetic shielding door (wall), 66a...Liquid helium container outer wall surface 3 wall), 7I...Support Components (wall materials).

Claims (1)

[Claims] A magnetic shielding system in which an amorphous sheet formed by sandwiching flaky amorphous metal between films is uniformly provided on at least the inner surface of a wall material that surrounds an object to be magnetically shielded from the outside. Shielding wall.