JP3633475B2 - Interdigital transducer method and panel, and magnetic darkroom - Google Patents

Description

[0001]
[Field of the Invention]
The present invention relates to an interdigital magnetic shield method andPanel and magnetic darkroomIn particular,StripMagnetismBoardMagnetic shield method using a group of wires arranged interdigitally, andPanel and magnetic darkroomAbout.
[0002]
[Prior art]
With the advancement of technology, facilities using large currents are increasing.
For example, in the train track 10 shown in FIG. 11, the return cable 21 that feeds power to the feeder 11 and the trolley wire 12 of the track 10 and the return route connected to the rail 13 due to an increase in the number of vehicles for each train and a reduction in the departure interval. The current flowing through the cable 22 is large.
In addition, there is a growing interest in the magnetic effects on the surroundings associated with the increase in capacity of ultra high voltage transmission lines. Furthermore, the magnetic influence on the surroundings by NMR diagnostic devices and other devices that use large currents has also been examined inside buildings.
[0003]
Since an electric current generates a magnetic field around it, if there is an electronic device in the vicinity of a large current, its operation, for example, an electron flow in the device may be affected. In the illustrated example, in order to prevent the influence of the magnetic field around the track 10, the forward cable 21, the return cable 22, and the like are accommodated in a magnetic shielding duct 23 surrounded by a magnetic material plate such as an iron plate. The feeder 11 is also housed in the magnetic shielding duct 23 as necessary. In the figure, reference numerals 14, 15, 16 and 17 denote a viaduct, a substation, a power supply device and a train, respectively.
[0004]
[Problems to be solved by the invention]
However, the conventional steel plate magnetic shield duct 23 has a problem that ventilation is poor because there is no opening other than the cable penetrating part, and the internal temperature becomes very high due to direct sunlight in summer. High temperatures inside the duct can cause cable insulation degradation.
[0005]
Accordingly, an object of the present invention is to provide a magnetic shielding method having air permeability in order to solve the above problems, andpanelTo provide.
[0006]
[Means for Solving the Problems]
The inventor of the present invention has noted that in an experiment using a magnetic shield plate, the magnetic shield effect is recognized not only on the surface of the magnetic shield plate but also in a certain range outside the periphery thereof. First, the magnetic shield effect on the outer periphery of the magnetic shield plate will be described with reference to the experimental examples of FIGS.
[0007]
[Experiment 1]
FIG. 5 shows a plan view of an experiment for confirming the magnetic shield effect on the outer periphery of one magnetic shield plate. In this experiment, a current was passed through a horizontal coil 1 having a length L = 4600 mm and a width D = 3100 mm, and the coil in the central portion of the conductor 1a on the long side was passed.OutsideDistance from conductor 1a on the side S =50A square directional silicon steel plate 2 having a side length C = 910 mm was vertically installed at a part of mm. A magnetic sensor 4 is placed at a distance X = 1540 mm from the coil conductor 1a on the measurement line 3 passing through the center of the coil 1 in the length direction, and the magnetic sensor 4 is connected to the length of the coil 1 while maintaining the distance X from the coil 1. The magnetic flux density was measured while moving in parallel with the coil conductor 1a (in the Y-axis direction in FIG. 3A) from one end in the vertical direction.
[0008]
The graph of FIG. 6 shows that when there is one magnetic shield plate 2 (curve β), three magnetic shield plates 2 are overlapped.SetAn example of the magnetic flux density measurement result by the magnetic sensor 4 in the case where the magnetic sensor 4 is overlapped (curve γ) and when five sheets are overlapped (curve δ) is shown. The horizontal axis of the graph indicates the distance from one end of the coil 1 in the length direction. The graph also shows the magnetic flux density when the magnetic shield plate 2 is not used (curve α) for comparison. From this graph, it can be seen that the magnetic shielding effect is also recognized in a certain range outside the periphery of the shield plate 2. It is clear from the graphEtAs can be seen, the shielding effect increases as the number of shield plates 2 increases, but in this experiment, the superposition of five sheets approached saturation.
[0009]
[Experiment 2]
Furthermore, the present inventor conducted an experiment for confirming the magnetic shield effect when the magnetic shield plate has a gap. In this experiment, on the outside of the coil in the central portion of the coil conductor 1a of FIG. 5, two square 455 × 455 mm magnetic shield plates 2 each made of iron plate as shown in FIG. It was installed in parallel with the conductor 1a. The same magnetic sensor 4 as in Experiment 1 was placed on the measurement line 3 at the center of both shield plates 2 at a distance X from the coil conductor 1a, and the magnetic flux density was measured while moving the magnetic sensor 4 parallel to the coil conductor 1a.
[0010]
The graph of FIG. 8 shows an example of the magnetic flux density measurement result by the magnetic sensor 4 when the distance G between the two magnetic shield plates 2 is 0, 50, 100, 200 and 455 mm (curve β to ζ). The horizontal axis of the graph indicates the distance Y on a line that passes through this origin and is perpendicular to the measurement line 3 with the measurement point taken at the center of both shield plates 2 as the origin (see FIG. 7). For comparison, the graph also shows the magnetic flux density measurement results when one magnetic shield plate 2 is used (curve α).
[0011]
It is clear from the graph of the figureEtThus, even if a gap G that is less than or equal to the width of the shield plate 2 in the direction parallel to the coil conductor 1a is provided (curve ζ), the back of the surface defined by the two magnetic shield plates 2 and the gap G and A considerable magnetic shielding effect was obtained in the portion including the outer periphery (hereinafter, sometimes referred to as the shade of the two shield plates 2). In addition, when the gap G was set to be equal to or less than half the width of the shield plate 2 (curve ε), a magnetic flux density reduction effect of about 10 μT was obtained in the shaded area of the two shield plates 2. When the two shield plates 2 are brought into close contact with each other and the distance G between them is 0 millimeter (curve β),910The same shielding effect as that of a single × 455 mm rectangular shield plate was obtained.
[0012]
As a result of performing the experiment 2 on the magnetic shield plates 2 of various shapes and materials, a plurality of magnetic shield plates 2 are arranged in parallel with the direction of the current to be magnetically shielded, and the interval G between the adjacent shield plates 2 is set as follows. The knowledge that a magnetic shield effect by a plurality of magnetic shield plates 2 can be obtained by selection is obtained. That is, adjacent to the product (Sm · μs) of the cross-sectional area (Sm) of the magnetic shield plate 2 in the direction orthogonal to the direction of the magnetic field to be shielded and the relative permeability μs of the shield plate 2.Shield plate 2The orthogonal gap betweenGThe ratio of the cross sectional area (Sa) of the gapGSpecifically, if the shield plate 2 is arranged so that (Sm · μs) / Sa> 1 so that the magnetic flux density inside becomes significantly smaller than the magnetic flux density in the magnetic shield plate 2, a plurality of magnetic The magnetic shield effect by the shield plate 2 is obtained. The present invention has been completed based on this finding. Between adjacent shield plates 2 in a plurality of magnetic shield plates 2gapG need not be constant. Further, even when the current is magnetically shielded, the angle between the surface of the magnetic shield plate 2 and the direction of the current to be shielded does not have to be limited to a right angle or parallel, and may be an angle of any size.
[0013]
Referring to FIG. 1, the interdigital magnetic shield method according to the present invention includes:A rectangular shape with a rectangular cross section perpendicular to the length direction, with the short side of the cross section being the thickness and the long side being the widthMagnetismBoard 5In a magnetic fieldThe length directions of the plates 5 are arranged in parallel on the same plane, and are separated by a gap G that is equal to or larger than the width in the thickness direction of the plates 5.InterdigitalPlace,In the transverse direction perpendicular to the length directionEach magnetismBoard 5Cross-sectional area (Sm) and magnetismBoard 5The ratio of the cross-sectional area (Sa) of the gap G (see FIG. 7) to the product (Sm · μs) with the relative permeability μs of (Sm · μs) / Sa> 1 is selected.InIt will be.Preferably,MagnetismBoard 5HerdIn the gap G, the magnetic fieldMagnetic flux densityReduced to the same level as when magnetic plates are placed without gapsLet
[0014]
Also14, 15 and 16Referring to the interdigital magnetic shield according to the present inventionpanel8 isA rectangular shape with a rectangular cross section perpendicular to the length direction, with the short side of the cross section being the thickness and the long side being the widthMagnetismBoard 5Group ofA panel is formed by arranging the plates 5 in a comb shape so that the length directions of the plates 5 are arranged in parallel on the same plane and are separated by a gap G of the width or more in the thickness direction of the plates 5.,In the transverse direction perpendicular to the length directionEach magnetismBoard 5Cross-sectional area (Sm) and magnetismBoard 5The ratio of the cross-sectional area (Sa) of the gap G (see FIG. 7) to the product (Sm · μs) with the relative permeability μs of (Sm · μs) / Sa> 1 is selected.InIt will be.Preferably, when installed in a magnetic field,MagnetismBoard 5HerdIn the gap G, the magnetic fieldMagnetic flux densityReduced to the same level as when magnetic plates are placed without gapsLet
[0015]
Embodiment
In the embodiment of FIG. 1A, the magnetic shield plate 2 of FIGS. 5 and 7 made of a magnetic material having a relative permeability μs = 60000 has a rectangular cross section with a length C = 910 mm, a width 20 mm, and a thickness 0.35 mm. Strip magnetBoard5 was used. In the figure, the short side (thickness direction) of the rectangular cross section is arranged in parallel with the current direction of the current carrier 1. Also, strip-shaped magneticBoard5 neighborsGap G(Hereinafter sometimes referred to as pitch) is 25 mm. The current in the horizontal coil conductor 1 was 50 amps. Hereinafter, the case where the current carrier 1 (hereinafter sometimes referred to as a magnetic field generation source) is the coil conductor 1 will be described, but the current carrier 1 is not limited to the coil conductor.
[0016]
Strip-shaped magnet with the arrangement shown in FIG.BoardGroup of 5Magnetic shield panel consisting ofIn order to confirm the magnetic shield effect by the coil conductor 1a from the coil conductor 1a outside the central portion of the coil conductor 1a as shown in FIG.distanceEach strip magnet is separated by S = 50mmBoardStrip-shaped magnet so that the central part in the length direction of 5 is the same height as the coil conductor 1aBoardOf 5Magnetic shield panelFormed. coilconductorThe magnetic sensor 4 was placed on a measurement line 3 passing through the center in the length direction 1 at a distance X from the coil conductor 1a, and the magnetic flux density was measured while changing the distance X from the coil conductor 1a. An example of the measurement result by the magnetic sensor 4 is shown in the graph of FIG. In addition, strip magnetismBoardFIG. 3 also shows the results of measuring the shielding effect with the magnetic sensor 4 when the pitch of 5 is increased to 50, 100, 200, 400 and 800 mm.
[0017]
As can be seen from the graph in FIG.BoardWhen 5 was arranged at a pitch of 25 mm, a shielding effect substantially equivalent to that of the entire shield by the magnetic shield plate 2 of FIG. 5 was obtained at a point 500 mm or more away from the horizontal coil conductor 1. The graph in FIG. 3 shows the measurement results when the height of the magnetic sensor 4 is the level of the coil conductor 1a (hereinafter referred to as the coil level). As shown in FIG. Even when the height was changed, it was confirmed that a shielding effect substantially equivalent to that of the full shield could be obtained at a point more than 500 mm away from the coil conductor 1.Α, β, γ, δ and ε in the figure are the heights from the coil level. 400mm , 300mm , 200mm , 100mm And 0 mm The experimental values are shown, and the experimental values in the case without the magnetic shield are also shown.
[0018]
From the graphs of FIGS. 3 and 4, the adjacent strip magnetismBoardGap between 5GThe magnet of FIG.Board 5In the group arrangement, the magnetism is perpendicular to the magnetic field due to the current.Of plate 5Cross-sectional area Sm (= 20mm × 0.35mm) and magnetismBoard 5Adjacent magnetism perpendicular to the magnetic field for the product (Sm · μs) of the relative permeability μs = 60000Board 5Gap betweenGBy setting the cross-sectional area Sa to about (25mm x 20mm), the gapGMagnetic flux density inside is strip-shaped magnetismBoard5 can be made significantly smaller than the magnetic flux density inBoard 5By groupWithout gapsIt was confirmed that a magnetic shielding effect equivalent to that of a full shield and having air permeability was obtained.
[0019]
Moreover, the magnetism of FIG.Board 5According to the arrangement of the group, it is 25 mm compared to the full shield by the magnetic shield plate 2 in FIG.Gap GA strip with a width of 20mmformMagnetismBoardSince 5 is sufficient, 20% (= {(25−20) / 25} × 100) is saved as a magnetic material material in obtaining a shielding effect substantially equivalent to that of the entire surface shielding.
[0020]
FIG. 2 shows, for example, a plane parallel to the direction of the current flowing through the current carrier 1 (see FIG. 1) and a predetermined interval perpendicular to the direction of the current.ParallelThe frame body 7 is formed so as to surround the intersection line with the plane row,ThatA group of magnetic bodies 6 which are rod-shaped in this case along the crossing line, So that its length direction is parallel to the same planeThe Example attached to the frame 7 in the interdigital shape is shown. Also when the rod-like magnetic body 6 of FIG. 2 is used, the sectional area (Sa) of the gap between the adjacent magnetic bodies 6 with respect to the product (Sm · μs) of the relative permeability μs and the sectional area Sm of the magnetic body 6 is obtained. By adjusting the ratio, the present inventor has experimentally confirmed that a shielding effect substantially equivalent to that of the entire surface shield can be obtained in the same manner as in FIGS. That is, strip-shaped magneticBoardBy arranging not only 5 but also the magnetic body 6 with the above-mentioned predetermined gap, a magnetic shielding effect with air permeability and transparency due to the space between the adjacent magnetic bodies 6 can be obtained.2 denotes a frame for fixing the magnetic plate 5 (magnetic body 6) arranged in a comb shape, the frame 7 is not essential to the present invention.
[0021]
Thus, the “air-permeable magnetic shield method andpanel"Is achieved.
[0022]
【Example】
FIG. 1 (B) shows the strip-shaped magnet of FIG. 1 (A).BoardTwo pairs of 5 were arranged at a pitch of 50 mmMagnetic shield panelThis is an example. Magnetism of Fig. 1 (B)Of plate 5According to the arrangement, although the shielding effect is inferior to the arrangement of FIG. 1A in the vicinity of the current carrier 1, the magnetic shielding effect similar to the arrangement of FIG. It was confirmed that it was obtained. Two strips of magnetismBoardAdjacent magnetism for the value of the product of cross-sectional area and relative permeability (Sm · μs) in group 5Board 5The ratio of the space cross-sectional area (Sa) between the strip-shaped magnets shown in FIG.BoardThis is considered to be the same as the case of the arrangement of 5. The arrangement configuration in FIG. 1B can create a larger gap than the configuration arrangement in FIG. 1A, and thus can provide better air permeability and transparency.
[0023]
In FIG. 1 (A), strip-shaped magnetismBoardThe short side (thickness direction) of the rectangular cross section of 5 is arranged parallel to the direction of the current (vertically placed), but as shown in FIG.BoardIt is also possible to arrange (sideways) the long side (width direction) of the rectangular cross section 5 in parallel with the current carrier, that is, the coil conductor 1. Figure 10 shows magnetismBoardThe graph which compares the magnetic shielding effect at the time of setting the case where 5 is placed vertically and the case where it is placed horizontally is shown. From the graph of FIG. 10, it was confirmed that the vertical placement and the horizontal placement show substantially the same magnetic shielding effect. However, the horizontal magnetic shielding performance in the vicinity of the coil conductor 1 is slightly superior. This is an adjacent strip magnetBoardBetween 5Gap GThis is considered to be smaller in the case of horizontal placement than in the case of vertical placement.
[0024]
Strip magnetBoardThe vertical placement and the horizontal placement when using 5 can be appropriately selected according to the conditions of the installation location. Preferably every other strip of magnetismBoard5 is arranged horizontally or vertically with a rectangular cross section, and other strip magnetsBoard5 is placed vertically or horizontally, and the magnet is placed horizontallyBoard5 and vertical magnetismBoard5 are arranged alternately. By alternately arranging horizontally and vertically, it is possible to adjust air permeability and transparency while maintaining desired magnetic shielding performance. It should be noted here that each strip magnetBoardThe posture of 5 is not limited to the horizontal placement or the vertical placement, and can be an arbitrary angular position between the horizontal placement and the vertical placement. Also, multiple strip magnetsBoardThe pitch of 5 does not necessarily have to be constant, and adjacent strip magnetismBoardOf 5Gap GIs a lot of magnetismBoardAdjacent strip magnetism in 5 groupsBoardIt may be different depending on the position of 5.
[0025]
Furthermore, the present inventor uses the interdigital magnetic shield of the present invention.StripMagnetismBoard 5As a result, it has been experimentally found that a directional magnetic material made of a directional silicon steel sheet having a longitudinal permeability larger than a transverse cross-sectional permeability is suitable. 1 and9In this example, a strip made of grain-oriented silicon steel sheetformMagnetismBoard5 was used, and it was confirmed that the magnetic permeability in the magnetic field direction can be increased as compared with that made of a non-oriented silicon steel plate, and thus a large shielding effect can be obtained. It was also confirmed that the same shielding effect was obtained with permalloy and equivalent magnetic materials.
[0026]
FIG. 12 is used in the present invention.The strip-shaped magnetic plate 5 or a rod-like shape that can be used as an alternativeVarious cross-sectional shapes of the magnetic body 6 are shown. In the figure, (A) is a cross-shaped section, (B) is a Y-shaped section, (C) is a circular section, (D) is a hollow circular section, (E) is a square (rectangular) section, and (F) is a hollow square section. (Rectangular) cross section, (G) is a star-shaped cross section, (H) is an H-shaped cross section, (I) is an I-shaped cross section, (J) is a T-shaped cross section, (K) is a semicircular cross section, (L ) Is a triangular cross section, (M) is a spiral cross section, (N) is a circular cross section having a multilayer space inside, and (O) is a square cross section having a multilayer space inside. The interdigital magnetic shield method of the present invention andpanelIs the cross-sectional shape of any of the above figures (A) to (O).Magnetic plate 5 orThe magnetic body 6 also has the desired effect.
[0027]
FIG. 13 shows the strip magnet of FIG.Board 5It is a schematic diagram of the whole shape of the Example from which these differ. In the figure, (A) is a simple strip.form, (B) is a medium-bulging type, (C) is a perforated strip.form, (D) is a needle, (E) is a triangle, (F) is a curved stripform, (G) is a bent stripform, (H) is an angle member type, (I) is a twisted stripform, (J) indicate a spiral type, respectively. FIG. 13 (K)ofRotating trapezoidal magnetic material,Same figure(L)ofMagnetic material of different diameter rebarIs a rod-shaped magnetic body 6,RespectivelyCan be an alternative to strip-shaped magnetic plate 5.
[0028]
FIG. 14 shows the interdigital array of the present invention.Magnetic shield panel using strip-shaped magnetic plate 5It is explanatory drawing of the aspect which incorporates in a magnetic shield wall, a floor, or joinery. In the figure, (A) is magnetic.Board 5(B) is magneticBoard 5Partition panel with built-in, (C) is magneticBoard 5(D) is an example of a magnetic stripBoard 5Display screen or display cover built in interdigital shape, (E) is magneticBoard 5The window blinds incorporating are shown respectively.
[0029]
FIG. 15 illustrates the present invention.Of the strip-shaped magnetic plate 5Interdigital arrayMagnetic shield panel usingFigure (B) is a perforated strip.formMagnetismBoard 5Magnetic shield of wire pair by row of (C) is 2 rows of stripsformMagnetismBoard 5The magnetic shield which pinched the wire pair by the group is shown. As shown in FIG.Strip-shaped magnetic plate 5Drill a through hole at a certain position,Strip-shaped magnetic plate 5Each in the groupMagnetic plate 5Align the through hole andMagnetic plate 5Magnetic shield of wire by inserting through the aligned through holepanelIt can be.
[0030]
FIG. 15A showsStrip-shaped magnetic plate 5FIG. 2 is a conceptual diagram of a magnetic shield type tent with a curtain member incorporating therein, and in order to make the magnetic shield type tent shown in FIG.panelForStrip-shaped magnetic plate 5Is a flexible curtain such as cloth, film or paper incorporated or interwoven in a comb shape.
[0031]
FIG. 15D shows a number of hollow annular magnetism.BoardWire in the hollow part ofOr facilities using large currentIs a magnetic shield that penetratesStrip-shaped magnetic plate 5Each in the groupMagnetic plate 5TheBend into a ringA through hole was drilled in the centerRingA magnetic plate,RingAlign the magnetic plate with the through holeHowever, it is arranged in a comb shape so that it is separated by a gap G that is greater than the width of each plate in the thickness direction of each plate.,Electrical wireOr facilities using large currentIs inserted through a through hole in which the magnetic material is aligned. Figure (E)Magnetic plate 5Shows the cable covering or bellows usingPenetratingAn annular cross-section with a through holeMagnetic plate 5Are arranged along the length direction of the cable as shown in FIG. Furthermore, the figure (F) bent both ends.U-shaped magnetic plateThe magnetic shield of the cable duct by the row of. The figure shows one section of the cable duct.While aligning with the concave part of the U-shaped magnetic plateArranged along the length of the cable as shown in Figure (D)Pass the cable or high-current facility through the aligned recess.Thus, a long magnetic shield duct can be formed.
[0032]
Figure 16 shows a strip-shaped magnet for the purpose of magnetic shielding.Board 5Another embodiment of the interdigital array is shown. In the figure, (A) is a strip of the same shape arranged in parallel.formMagnetismBoard 5An arrangement in which two interdigital arrays are interdigitated with each other, (B) is a wide strip.formMagnetismBoard 5Interdigital array and narrow stripformMagnetismBoard 5An arrangement mode in which interdigital arrays are interdigitated with each other, (C) is a strip of the same shapeformMagnetismBoard 5Strips of the same shape as the interdigital array arranged in parallelformMagnetismBoard 5And other interdigital arrays arranged in parallel with the magnetic properties in each interdigital array.Board 5Are arranged so that their longitudinal directions are orthogonal to each other, (D) is a strip of the same shape arranged in parallel on both sides of the flexible curtainformMagnetismBoard 5(E) is a strip of the same shape arranged in parallel.formMagnetismBoard 5The arrangement | positioning aspect with which the flexible curtain was attached to the both sides | surfaces of the interdigital array is shown, respectively.
[0033]
FIG. 17 shows the shape of a strip-shaped magnet on the wall, floor and / or ceiling of a magnetic darkroom (magnetic shield room).Board 5It is explanatory drawing of the method comprised by the wall surface of utilization.The interdigital magnetic darkroom shown in FIG. 17 is a strip-shaped magnetic plate having a rectangular cross section perpendicular to the length direction on the wall, floor and / or ceiling surfaces, with the short side being thick and the long side being the width. The groups of 5 are interdigitally such that the length direction of each plate 5 is arranged in parallel on the surface of the wall, floor and / or ceiling, and is separated by a gap G which is not less than the width in the thickness direction of each plate 5. The area of the cross section of each magnetic plate 5 in the lateral direction perpendicular to the length direction (S m ) And the relative permeability μ of the magnetic plate 5 s Product with (S m ・ Μ s ) Cross-sectional area (S a ) Percentage (S m ・ Μ s ) / S a It was chosen to be> 1.In the figure, (A) is a strip of the same shape arranged vertically.formMagnetismBoard 5A magnetic darkroom with a peripheral wall with an interdigital array on the outside, (B) is a strip of the same shape arranged verticallyformMagnetismBoard 5Magnetic darkroom with surrounding walls with inner and outer interdigital arrays, (C) is a strip of identical shapeformMagnetismBoard 5Strips of the same shape as one interdigital array arranged in parallelformMagnetismBoard 5Magnetic properties in each interdigital array inside and outside the surrounding wall with other interdigital arrays arranged in parallelBoard 5Magnetic darkrooms stacked and attached so that their longitudinal directions are orthogonal to each other, (D) is a strip of the same shape arranged horizontallyformMagnetismBoard 5A magnetic darkroom having a peripheral wall with an interdigital array arranged on the outside and in which each interdigital array is connected to each other in a row, (E) is a strip of the same shape arranged in parallelformMagnetismBoard 5A magnetic darkroom in which the entire surrounding wall is magnetically shielded by the interdigital array is shown.
[0034]
FIG. 17F shows a plurality of vertical directions.NaStripformMagnetismBoard 5MutuallyGap GFIG. 17 (G) shows the flow paths arranged so as to pass through the intersections of the horizontal orthogonal meshes with each other around the hollow portion along the central axis.Gap GMultiple strips attached radially with a gap between themformMagnetismBoard 5Each of the flow paths having
[0035]
Interdigital magnetic shield method of the present inventionAnd panels and magnetic darkroomIs widely applicable to civil engineering, construction, and other technical fields. In the civil engineering field, when providing magnetic shielding functions for railway noise barriers, floor slabs, box culverts, formwork ribs, station buildings, feeder lines, etc., and when providing magnetic shielding functions for underground transmission lines such as joint grooves, etc. Application to can be expected. In the field of architecture, for example, MRI and SQUID in hospitals, EB devices and electron microscopes in semiconductor factories, magnetic shields (passive shields) for shielding disturbance magnetic fields in facilities such as electron microscopes and NMR in laboratories, Strong magnetic field facilities such as accelerators and nuclear fusion in laboratories, motors and transformers in substations, electrical rooms in offices, magnetic shields (active shields) that prevent leakage of magnetic fields from other facilities to the outside, computer rooms in buildings It can be expected to be applied to magnetic shield walls and slabs in electric and electrical rooms. It can be expected to be used as a device member such as a display cover, and it can also be expected to be applied to a hybrid type fitting such as a soundproof / magnetic shield wall combined with a sound absorbing material.
[0036]
【The invention's effect】
As explained in detail above, the interdigital magnetic shield method of the present invention orpanelMultipleStripMagnetismBoardTheThe length direction of each plate is arranged in parallel on the same surface, and the thickness direction of each plate is separated by a gap more than the width of each plate.Arranged in a comb shapeShi,The area of the cross section of each magnetic plate in the transverse direction perpendicular to the length direction (S m ) And magnetic plate relative permeability μ s Product with (S m ・ Μ s ) Cross-sectional area (S a ) Percentage (S m ・ Μ s ) / S a Choose to be> 1Therefore, the following remarkable effects are produced.
[0037]
(A) A magnetic shield with good air permeability can be provided to prevent deterioration of materials and equipment due to temperature rise.
(B) Magnetic shieldpanelCan be made transparent, and maintenance and management of equipment with a magnetic shield can be facilitated.
(C) StripformMagnetismBoardShield with variable angle in a blind shapepanelThus, it is possible to realize a magnetic shield capable of adjusting air permeability and transparency.
(D)StripMagnetismGap greater than the width of the plateIt is possible to reduce the magnetic material corresponding to.
(E) An economical design that optimizes the amount of material used according to the required shield level becomes possible.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of an embodiment of a magnetic shielding method of the present invention.
FIG. 2 is a magnetic shield of the present inventionpanelIt is explanatory drawing of one Example.
FIG. 3 shows different pitchesStripMagnetismBoardIt is a graph which shows the shielding effect of this invention using the group of.
FIG. 4 is a graph showing the shielding effect of the present invention when the height of the magnetic sensor is changed.
FIG. 5 is an explanatory diagram of Experiment 1 for confirming the shielding effect on the outer periphery of the magnetic shield plate.
FIG. 6 is an example of a graph showing the peripheral magnetic shielding effect of FIG. 5;
FIG. 7 is an explanatory diagram of Experiment 2 for confirming the magnetic shield effect of the magnetic shield plate with a gap.
FIG. 8 is an example of a graph showing the magnetic shielding effect of FIG.
FIG. 9 is a strip-shaped magnetismBoardOf rectangular cross sectionShort side orIt is explanatory drawing of the Example which has arrange | positioned the long side in parallel with an electric current.
FIG. 10 is an example of a graph showing a shielding effect of the embodiment of FIG. 9;
FIG. 11 is an explanatory diagram of a magnetic shield in a conventional train line.
FIG.A strip-shaped magnetic plate or a barIt is a figure which shows the various cross-sectional shapes of a magnetic body.
FIG. 13 is a strip magnetBoardIt is a figure which shows various three-dimensional shapes.
FIG. 14 showsThe magnetic shield panel of the present inventionIt is explanatory drawing of the aspect integrated in a wall, a floor, or a fitting.
FIG. 15 showsMagnetic shield panel of the present inventionIt is explanatory drawing of the magnetic shield for electric wires using.
FIG. 16 showsMagnetic shield panel of the present inventionIt is a figure which shows various attachment aspects.
FIG.Of the present inventionIt is a figure which shows the wall surface of a magnetic darkroom.
[Explanation of symbols]
1 ... current carrier 2 ... magnetic shield plate
3 ... Measurement line 4 ... Magnetic sensor
5 ... Strip-shaped magnetismBoard        6 ...Rod-shapedMagnetic material
7 ... Frame 8 ... Magnetic shieldpanel
10 ... Train line 11 ... Wire
12 ... trolley wire 13 ... rail
14 ... Viaduct 15 ... Substation
16 ... Power supply 17 ... Train
21 ... Outward cable 22 ... Return cable
23… Magnetic shield duct

Claims (18)

A group of strip-shaped magnetic plates whose rectangular cross section perpendicular to the length direction is rectangular and whose short side is thick and whose long side is the width are parallel to each other in the magnetic field. Are arranged in a comb shape so as to be separated by a gap of the width or more in the thickness direction of each plate , and the cross-sectional area (Sm) of each magnetic plate in the transverse direction perpendicular to the length direction and the magnetic plate relative permeability .mu.s and the product (Sm · μs) the ratio of the cross-sectional area (Sa) of the gap for (Sm · μs) / Sa> blind type magnetic shield method comprising Nde selected to be 1. 2. The shield type magnetic shielding method according to claim 1 , wherein the magnetic flux density of the magnetic field is reduced in the gap between the magnetic plate groups to the same extent as when a magnetic plate is arranged without a gap . 3. The shield type magnetic shielding method according to claim 1 or 2 , wherein a length direction of the strip-shaped magnetic plate is parallel to a direction of a magnetic force line of the magnetic field. In any of the shielding method of claims 1 to 3, the strip-shaped magnetic plates, blind-type magnetic shield method lengthwise permeability becomes as large directional magnetic material than the lateral permeability. 5. The shield type magnetic shield method according to claim 1 , wherein a plurality of the interleaved magnetic plate groups are connected to each other in a row at the longitudinal edges of the magnetic plate groups. . 5. The shield type magnetic shield according to claim 1 , wherein a plurality of the interdigitally arranged magnetic plate groups are laminated such that the length directions of the magnetic plates in each group are orthogonal to each other. Method. A group of strip-shaped magnetic plates each having a rectangular cross section perpendicular to the length direction and having a short side of the cross section as a thickness and a long side as a width are arranged in parallel on the same plane in the length direction A panel is formed by interdigitally arranging the plates in the thickness direction so as to be separated by a gap larger than the width, and the cross-sectional area (Sm) of each magnetic plate in the transverse direction perpendicular to the length direction magnetic plate relative permeability .mu.s and the product (Sm · μs) (Sm · μs) the ratio of the cross-sectional area of the gap (Sa) for / Sa> blind type magnetic shield panel comprising Nde selected to be 1. 8. The shield type magnetic shield panel according to claim 7, wherein when installed in a magnetic field, the interdigital magnetic shield panel is formed by reducing the magnetic flux density of the magnetic field in the gap between the magnetic plate groups to the same extent as when the magnetic plate is arranged without a gap . The shield panel according to claim 7 or 8, the strip-shaped magnetic plates, longitudinal permeability becomes as large directional magnetic material than the lateral permeability blind type magnetic shield panel. In any of the shield panel of claims 7 9, wherein each strip-shaped magnetic plates and an annular magnetic plate that is a through hole centrally bent into an annular bored, while aligning the annular magnetic plate with through holes each An interdigital magnetic shield panel that is arranged in a comb shape so as to be separated by a gap of the width or more in the thickness direction of the plate, and an electric wire or a device for using a large current is inserted into the aligned through hole. In any of the shield panel of claims 7 9, wherein the U-shaped magnetic plate by bending the opposite ends of each strip-shaped magnetic plates, the said U-shaped magnetic plates in the thickness direction of the Kakuita while being aligned with the recess An interdigital magnetic shield panel , which is arranged in an interdigital shape so as to be separated by a gap of at least a width, and an electric wire or a device for using large current is passed through the aligned recess . In any of the shield panel of claims 7 9, a plurality of magnetic plates groups of the interdigital arrangement, blind-type magnetic shield panels formed by coupling to one another in rows in the length direction end edges of the magnetic plate group . In any of the shield panel of claims 7 9, a plurality of magnetic plates groups of the interdigital arrangement, blind-type magnetic shield panel comprising meshed in a comb-like to one another. In any of the shield panel of claims 7 9, wherein the interdigital arrangement of a plurality of magnetic plate group, interdigital type magnetic shield length direction of the magnetic plate in each group formed by laminating so as to be perpendicular to each other Panel . A group of strip-shaped magnetic plates having a rectangular cross section perpendicular to the length direction on the wall, floor and / or ceiling surfaces, with the short side of the cross section being thick and the long side being the width, The lengthwise direction is parallel to the surface of the wall, floor and / or ceiling and is arranged in a comb shape so as to be separated by a gap of the width or more in the thickness direction of each plate, and is perpendicular to the length direction. sectional area of the gap to the product (Sm · μs) with relative permeability .mu.s the magnetic plate area of the cross section of each of the magnetic plates (Sm) in the transverse direction ratio of (Sa) (Sm · μs) / Sa> comb-type magnetic dark room made Nde selected to be 1. 16. The interstitial magnetic darkroom according to claim 15, wherein the magnetic flux density of the magnetic field in the gap between the magnetic plate groups is reduced to the same extent as when a magnetic plate is disposed without a gap. The magnetic darkroom claim 15 or 16, wherein the wall, floor and / or ceiling of the magnetic plate group interdigital arrangement, blind magnetic darkroom formed by binding to each other in each of the lengthwise edges. The magnetic darkroom claim 15 or 16, laminate the walls, the floor and / or ceiling, the plurality of magnetic plates groups of the interdigital arrangement, such that the length direction of the magnetic plate in each group are orthogonal to each other This is a blind type magnetic darkroom.

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