JP2006014401A - Cable duct - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cable duct capable of enhancing the workability and form preservability of a magnetic shield member. <P>SOLUTION: In the cable duct for inserting and laying a cable 4, a magnetic shield panel 3 is formed by providing a plate material 1 with a magnetic shield member 2 formed of a magnetic material, and a space 5 for inserting the cable 4 is formed by coupling the magnetic shield members 2 of a plurality of magnetic shield panels 3. The plate material 1 and the magnetic shield member 2 can be integrated by paneling. When the magnetic shield member 2 is constructed, it can be constructed simultaneously with the plate material 1 and a plurality of magnetic shield members 2 are not required to be constructed one by one. The plate material 1 can protect the magnetic shield member 2 and can prevent deformation and damage due to an inadvertent force. Magnetic flux generated from the cable 4 in the insertion space 5 can be absorbed by the magnetic shield member 2 and fed into the magnetic shield member 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cable duct used when a cable such as a feeder line is laid.

  Conventionally, it has been practiced to form a sealed cable duct by combining flat magnetic shield plates into a cylindrical shape (see, for example, Patent Document 1). Recently, however, a large number of strip-shaped magnetic shield members are used. An open-type cable duct has been proposed which is arranged in a comb shape and causes attenuation of magnetic flux density (magnetic field strength) between opposing surfaces of adjacent magnetic shield members (see, for example, Patent Document 2).

However, if a large number of strip-shaped magnetic shield members are arranged side by side in a comb shape, it may take a lot of time or the magnetic shield member may be deformed by inadvertent force. In addition, there is a problem that shape retention is low.
JP 2001-231161 A JP 2002-164686 A

  This invention is made | formed in view of said point, and it aims at providing the duct for cables which can improve the construction property and shape retention property of a magnetic shielding member.

  The present invention is a cable duct for inserting and laying a cable 4, wherein a magnetic shield member 2 formed of a magnetic material is provided on a plate 1 to form a magnetic shield panel 3, and a plurality of magnetic shield panels By connecting the three magnetic shield members 2 to each other, an insertion space 5 for inserting the cable 4 is formed.

  According to this invention, the plate material 1 and the magnetic shield member 2 can be integrated by forming a panel, and when the magnetic shield member 2 is constructed, it can be constructed simultaneously with the plate material 1 and a plurality of magnetic shield members 2 are constructed. It is possible to improve the workability without the need for construction one by one, and to protect the magnetic shield member 2 with the plate material 1 to prevent deformation or breakage due to inadvertent force. The shape of the magnetic shield member 2 can be improved, and the magnetic shield panel 3 includes the magnetic shield member 2, and a plurality of magnetic shield members 2 are connected to each other so that they can be inserted. After the magnetic flux generated from the cable 4 in the space 5 is absorbed by the magnetic shield member 2, the magnetic flux can flow into the magnetic shield member 2, and the magnetic shield In which it can be secured.

  In the present invention, the axial direction of the cable 4 and the plate surface of the magnetic shield member 2 are preferably in a positional relationship.

  According to this invention, the magnetic flux generated from the cable 4 in the insertion space 5 can be efficiently absorbed by the magnetic shield member 2, and the positional relationship is such that the axial direction of the cable 4 and the plate surface of the magnetic shield member 2 do not intersect. Compared with some cases, the magnetic shielding properties can be improved.

  Further, according to the present invention, the cable 4 in the insertion space 5 and the thickness direction of the magnetic shield member 2 can be made substantially parallel.

  According to the present invention, the magnetic flux generated from the cable 4 in the insertion space 5 can be efficiently absorbed by the magnetic shield member 2, compared to a case where the cable 4 and the thickness direction of the magnetic shield member 2 are not substantially parallel. The magnetic shielding property can be improved.

  In the present invention, a magnetic shield member 2 can be provided between two or more plate materials 1 and 1.

  According to this invention, compared with the case where a single plate 1 is used, the protection and reinforcement of the magnetic shield member 2 by the plate 1 can be enhanced, and the shape retention of the magnetic shield 2 can be further improved. It is something that can be done.

  In addition, the present invention can be provided with a heat radiating portion 7 for releasing heat generated from the cable 4 in the insertion space 5.

  According to the present invention, heat generated from the cable 4 can be released from the heat radiating portion 7, and damage to the cable 4 due to heat can be prevented.

  In the present invention, the magnetic shield member 2 can be held by the heat insulating member 6.

  According to this invention, the magnetic shield member 2 can be held in a stretched state so as not to bend by the heat insulating member 6, and a decrease in magnetic shielding properties can be prevented. The heat insulation effect can be obtained.

  In the present invention, it is preferable that the heat insulating member 6 has fire resistance.

  According to the present invention, it is possible to reduce the spread of fire due to ignition from the cable 4 and to protect the cable 4 from the flame generated outside the cable duct, and to increase the non-combustion / fire resistance / fire resistance performance. It can be done.

  In the present invention, the plate material and the magnetic shield member can be integrated by forming a panel, and when the magnetic shield member is constructed, it can be constructed at the same time as the plate material, and when constructing a plurality of magnetic shield members one by one. It is possible to improve the workability. Further, the magnetic shield member can be protected by the plate material to prevent deformation or breakage due to inadvertent force, and the shape retention of the magnetic shield member can be improved. Further, the magnetic shield panel includes a magnetic shield member, and a plurality of magnetic shield members are connected, so that the magnetic flux generated from the cable in the insertion space is absorbed by the magnetic shield member, and then the magnetic flux is put into the magnetic shield member. It can flow and can secure magnetic shielding properties.

  Hereinafter, the best mode for carrying out the present invention will be described.

  As shown in FIG. 1, the cable duct of the present invention can be formed as a duct for a high-voltage cable, for example. This cable duct is formed by arranging a plurality of duct components 10, 10,..., And each duct component 10 is formed by assembling a plurality of magnetic shield panels 3, 3,. Yes.

  The magnetic shield panel 3 is as shown in FIGS. 2 (a) and 2 (b), and includes a plate member 1, a magnetic shield member 2, and a heat insulating member 6. The plate material 1 is a metal plate and may be formed of any material as long as it has a thickness of 0.25 to 1.6 mm and can ensure rigidity as a panel, for example, an iron plate, A steel plate, a stainless steel plate, a coated steel plate, a galvanized steel plate, an aluminum-zinc alloy plated steel plate, an aluminum plate, or the like can be used. Further, as the plate material 1, a perforated metal plate such as a punching metal can be used. Moreover, as the board | plate material 1, you may have a radio wave shielding property which can shield the electromagnetic wave of frequency 10kHz-40GHz. Further, a cover piece 11 is bent at a substantially right angle at the front end portion and the rear end portion of the plate member 1.

  In addition to the above, as the plate material 1, for example, the transparent plate material 1 can be made of transparent glass or a synthetic resin such as acrylic resin, polycarbonate, vinyl chloride resin, etc. The transparent plate material 1 may be, for example, a template glass, a ground glass, or a punching metal. Furthermore, the plate 1 may be breathable. Further, the plate material 1 can be formed such that a part thereof has transparency and the other part does not have transparency. In this case, the part having transparency is made of a transparent glass plate material, an acrylic resin, or the like. And a portion having non-permeability can be made of a plate material such as plywood or gypsum board.

  The magnetic shield member 2 can be formed of a magnetic material such as an electromagnetic steel plate, permalloy, amorphous metal, or a nanocrystalline soft magnetic material (“Finemet (R)” manufactured by Hitachi Metals, Ltd.). Further, as shown in FIG. 3, the magnetic shield member 2 can be formed in a rectangular plate shape (strip shape) that is long in the vertical direction. Such a magnetic shield member 2 can be formed by laminating a plurality of thin magnetic shield materials 2a made of the above magnetic material. FIG. 3 shows an example in which the magnetic shield member 2 is formed using ten magnetic shield members 2a having a thickness of 0.35 mm. However, the present invention is not limited to this, and the number and thickness of the magnetic shield members 2a can be set as appropriate. it can. Further, both end portions in the longitudinal direction of the magnetic shield member 2 are formed as connecting portions 12.

  In addition to the above, the magnetic shield member 2 has various cross-sectional shapes such as a cross-shaped cross section, a Y-shaped cross section, a circular cross section, a hollow circular cross section, a square (rectangular) cross section, a hollow rectangular (rectangular) cross section, a star cross section, It can be formed into an H-shaped cross section, an I-shaped cross section, a T-shaped cross section, a semicircular cross section, a triangular cross section, a spiral cross section, a circular cross section having a multilayer space inside, and a rectangular cross section having a multilayer space inside. The magnetic shield member 2 may be, for example, a simple strip type, a middle bulge type, a perforated strip type, a needle type, a triangular type, a curved strip type, a bent strip type, an angle member type, a twisted strip type, a spiral type, or a rotary trapezoid type. It can be formed into various shapes such as a mold, a different diameter rebar-shaped mold. Furthermore, the magnetic shield member 2 can be subjected to rust prevention treatment or painting. The coating can be performed by a known method such as dacro, organic, powder, electrostatic or the like.

The heat insulating member 6 has been conventionally used as a heat insulating material, and examples thereof include inorganic fiber materials such as rock wool, glass wool, and ceramic fibers, and resin foam materials such as urethane foam and phenol foam. In particular, the heat insulating member 6 is preferably made of rock wool, glass wool, or phenol foam that has heat resistance as well as fire resistance. Further, the heat insulating member 6 can be formed in a block shape such as a square bar, and the heat insulating member 6 having a density of usually 20 to 400 kg / m ³ can be used, but the weight of the magnetic shield panel 3 is considered. Thus, it is preferable to use a material of 120 to 200 kg / m ³ .

The magnetic shield panel 3 used in the present invention can be formed by providing one or a plurality of magnetic shield members 2 and heat insulating members 6 on the plate material 1 described above. That is, as shown in FIGS. 4 (a) and 4 (b), the magnetic shield panel 3 is provided with a plurality of magnetic shield members 2 and a heat insulating member 6 interposed between two plate members 1 and 1 arranged opposite to each other. Can be formed. The magnetic shield members 2 are arranged substantially in parallel between the two plate members 1 and 1 with a predetermined interval so that the plane portions (surfaces having the largest area) face each other. Here, the magnetic shield panel 3 preferably satisfies the condition of the following expression (1).
(Sm · μs) / Sa> 1 (1)
Sm is the area of the cross section of the magnetic shield member 2, μs is the relative permeability of the magnetic material of the magnetic shield member 2, and Sa is the area of the cross section of the space (interval) between the adjacent magnetic shield members 2 and 2. Shown respectively.

  As in the case of Patent Document 2, the magnetic shield panel 3 that satisfies the condition (1) can attenuate the magnetic flux density in the gap between the adjacent magnetic shield members 2 and 2, and the magnetic shield is effective. Can be obtained.

  In the present invention, the heat insulating member 6 is filled between the adjacent magnetic shield members 2 and 2, and the heat insulating member 6 is bonded to the inner surfaces (surfaces facing each other) of the plate members 1 and 1. In addition, as shown in FIG. 5, the plurality of heat insulating members 6 are arranged side by side in the vertical and horizontal directions. When the plurality of heat insulating members 6 are used in the longitudinal direction, the heat insulating members 6 and 6 adjacent in the longitudinal direction are used. The seams 6a may be arranged in a straight line, but it is preferable in terms of improving the strength that the heat insulating members 6 are arranged while being slightly shifted in the longitudinal direction so that the seams 6a are not arranged in a straight line. The magnetic shield member 2 is sandwiched between the adjacent heat insulating members 6 and 6 and held between the two plate members 1 and 1. Therefore, the magnetic shield member 2 is directly fixed to the plate member 1. However, the magnetic shield member 2 is free to move in the longitudinal direction. However, since the magnetic shield member 2 is sandwiched between the adjacent heat insulating members 6, 6, the movement is restricted by a force that can maintain the shape of the duct structure 10 described later. In the present invention, since the magnetic shield member 2 is sandwiched between the heat insulating members 6 from both sides over substantially the entire length thereof, there is no fear of bending and deforming in the middle, and the magnetic shield member 2 is always in the longitudinal direction. It can be held in a stretched and stretched state, and a decrease in the magnetic shielding properties of the magnetic shield panel 3 can be prevented. Further, the front surface and the rear surface of the heat insulating member 6 arranged at the foremost part and the rearmost part of the magnetic shield panel 3 are covered with the covering pieces 11 of the respective plate members 1. The tip of the cover piece 11 of one plate 1 and the tip of the other cover piece 11 are in contact with each other at a substantially central portion in the thickness direction of the magnetic shield panel 3. Note that the tips of the cover pieces 11 and 11 do not need to be brought into contact with each other and may not be brought into contact with each other. Further, the heat insulating member 6 is exposed at the two end surfaces not covered with the covering piece 11 of the magnetic shield panel 3 and the connecting portion 12 of the magnetic shield member 2 disposed between the plate members 1 and 1 from these end surfaces. Is protruding.

  In forming the magnetic shield panel 3 as described above, for example, as shown in FIG. 6, while holding the plate material 1 on which the heat insulating member 6 and the magnetic shield member 2 are arranged on the lifting and lowering holder 103, the reversing machine The other plate material 1 is inverted by 104 and placed on the heat insulating member 6. At this time, an adhesive is applied to the plate 1 to be reversed. In this way, the heat insulating member 6 and the magnetic shield member 2 can be provided between the two plate members 1 and 1. In disposing the heat insulating member 6 and the magnetic shield member 2 on the plate member 1, the heat insulating member 6 and the magnetic shield member 2 are alternately placed on the plate member 1, or the heat insulating member 6 and the magnetic shield member 2 are alternately arranged. After that, the unit can be placed on the plate member 1, and thereby the magnetic shield member 2 is disposed between the adjacent heat insulating members 6 and 6. Further, the heat insulating member 6 and the magnetic shield member 2 may be disposed on the plate material 1 with the plate material 1 held on the lifting / lowering holding machine 103 or with the plate material 1 not held. The lifting and holding machine 103 is provided with a holding tool 105 for holding the plate material 1 on which the heat insulating member 6 is disposed at a fixed position. Further, the reversing machine 104 is provided with a suction tool 106 formed of a magnet, a vacuum pad, or the like. Moreover, in order to make it easy to cover the board | plate material 1 on the heat insulation member 6 in order to make the board | substrate 1 to hold | maintain the board | plate material 1 to invert a board | substrate 1 in a fixed position with respect to the inversion machine 104, and to compress The compressor 108 is provided.

  As shown in FIG. 4A, the magnetic shield panel 3 is not only in contact with the longitudinal end surface of the magnetic shield member 2 and the inner surface of the plate member 1, but as shown in FIG. The gap 15 may be formed by increasing the distance between the longitudinal end surface of the plate and the inner surface of the plate member 1, thereby preventing a decrease in fire resistance and fireproof performance. The distance between the longitudinal end surface of the magnetic shield member 2 and the inner surface of the plate 1 can be set as appropriate, but is preferably 10 mm or less, more preferably 3 to 10 mm.

  Moreover, when the heat insulating member 6 is formed of a fiber body such as rock wool, the fiber direction may be any direction, but the thickness direction of the magnetic shield panel 3 (direction orthogonal to the surface of the plate 1) and It is preferable to be parallel (including substantially parallel), whereby the strength of the magnetic shield panel 3 can be prevented from being lowered.

  The duct structure 10 used in the present invention includes a lower panel 3a and an upper panel 3b as shown in FIG. 2 (b) formed as a magnetic shield panel 3, and two side panels 3c as shown in FIG. 2 (a). Can be formed into a substantially rectangular tube shape. In this case, the lower panel 3a and the upper panel 3b can be equivalent, and the side panel 3c has a dimension in a direction perpendicular to the front-rear direction (in a direction parallel to the longitudinal direction of the magnetic shield member 2). It is possible to use one having a dimension shorter than that of the lower panel 3a and the upper panel 3b.

  And in forming the duct structure 10, it can carry out as follows, for example. First, after arranging the lower panel 3a so that the longitudinal direction of the magnetic shield member 2 is substantially horizontal, the side panels 3c are arranged above both sides of the lower panel 3a. At this time, the side panel 3c is arranged so that the longitudinal direction of the magnetic shield member 2 is substantially vertical. Next, the connecting portion 12 of the magnetic shield member 2 of the lower panel 3a and the lower connecting portion 12 of the magnetic shield member 2 of the side panel 3c are connected to each other with a fixing tool such as a screw or a clip in the front-rear state. And connect. In this way, by connecting the magnetic shield member 2 of the lower panel 3a and the magnetic shield member 2 of the side panel 3c one by one, the side panel 3c is attached to both sides of the lower panel 3a, and the lower panel 3a The magnetic shield member 2 and the magnetic shield member 2 of the side panel 3c are mechanically and electrically connected. Next, the outer cover 13 and the inner cover 14 are attached across the lower panel 3a and the side panel 3c. The outer cover 13 and the inner cover 14 are formed of a metal material such as stainless steel and have a substantially L-shaped cross section, and the outer cover 13 extends over the entire length of the outside of the connecting portion of the lower panel 3a and the side panel 3c. The inner cover 14 is attached so as to cover the entire inner side of the connecting portion of the lower panel 3a and the side panel 3c. The outer cover 13 and the inner cover 14 are attached to the lower panel 3a and the side panel 3c using a fixing tool such as a rivet or an adhesive.

  Next, as shown in FIG. 7, the upper panel 3b is disposed between the upper ends of the side panels 3c and 3c arranged to face each other, and the connecting portion 12 and the side portion of the magnetic shield member 2 of the upper panel 3b. In a state where the upper connecting portion 12 of the magnetic shield member 2 of the panel 3c is joined back and forth, it is connected by a fixing tool such as a screw or a clip. In this way, by connecting the magnetic shield member 2 of the upper panel 3b and the magnetic shield member 2 of the side panel 3c one by one, both side portions of the upper panel 3b are attached to the upper end of each side panel 3c, The magnetic shield member 2 of the upper panel 3b and the magnetic shield member 2 of the side panel 3c are mechanically and electrically connected. Next, the same outer cover 13 and inner cover 14 as those described above are attached across the upper panel 3b and the side panel 3c, and the outer cover 13 is connected to the outer side of the connecting portion between the upper panel 3b and the side panel 3c. 14 to cover the inside of the connecting portion of the upper panel 3b and the side panel 3c. In this way, the duct structure 10 including the plurality of magnetic shield panels 3, the outer cover 13, and the inner cover 14 can be formed. In addition, if the duct structure 10 can form the insertion space 5 for inserting the cable 4, the number and shape of the magnetic shield panel 3, the shape and formation method of the duct structure 10, etc. are not particularly limited.

  In the duct structure 10, a space surrounded by the lower panel 3 a, the upper panel 3 b, and the two side panels 3 c is formed as an insertion space 5. The insertion space 5 includes a front surface and a rear surface of the duct structure 10. It is open at. And the duct for cables of this invention can be formed by arrange | positioning the several duct structure body 10. FIG. Here, the front and rear duct structures 10 and 10 are arranged at a predetermined interval, and a space between the front and rear duct structures 10 and 10 is formed as the heat radiating portion 7. The heat radiating portion 7 is provided to release heat generated from the cable 4 inserted into the insertion space 5 from the cable duct. The distance between the front and rear of the duct structures 10 and 10 can be made substantially equal to the distance (pitch) between the magnetic shield members 2 and 2 provided on the magnetic shield panel 3. The performance can be prevented from deteriorating. In addition, when the space | interval of the magnetic shield members 2 and 2 is 150 mm, it is preferable that the space | interval of the front and rear of the duct structure 10 and 10 shall be 150 mm or less.

  In inserting the cable 4 into the cable duct of the present invention, first, a member having a substantially U-shaped cross section composed of the lower panel 3a and the two side panels 3c and the lower outer cover 13 and the inner cover 14 is assembled. After that, a predetermined number (for example, three) of cables 4 are arranged on the upper side of the lower panel 3a serving as the insertion space 5, and then the upper panel 3b, the upper outer cover 13 and the inner cover as described above. And can be assembled. In this case, the assembly of the substantially U-shaped member may be performed at a place other than the construction site such as a factory.

  The cable 4 can be laid by holding the long cable 4 over the plurality of duct structures 10 in a state where the long cable 4 is inserted into the insertion space 5. At this time, in the insertion space 5, the longitudinal direction of the cable 4 and the thickness direction of the magnetic shield member 2 of the duct structure 10 (stacking direction of the magnetic shield material 2 a) are made parallel (substantially parallel). And the positional relationship in which the axial direction of the cable 4 and the surface direction of the plate surface of the magnetic shield member 2 (surface orthogonal to the thickness direction of the magnetic shield member 2) intersect, The magnetic shield member 2 can efficiently absorb the magnetic flux generated from the cable 4 and the magnetic shield property can be improved as compared with the case where the cable 4 and the thickness direction of the magnetic shield member 2 are orthogonal to each other.

  FIG. 8 shows another example of the duct structure 10. This duct structure 10 is an open top type, and in FIG. 7, a plurality of magnetic shield members 2, 2,... Are used instead of the upper panel 3a, and two magnetic shields are used as the side panel 3c. A member provided with a plurality of magnetic shield member sets 20 each including the members 2 and 2 is used. As shown in FIG. 9, the side panel 3c can be formed by providing one or a plurality of magnetic shield member sets 20 and a heat insulating member 6 on the same plate material 1 as described above. That is, the side panel 3c can be formed by providing a plurality of magnetic shield member sets 20 and heat insulating members 6 between the two plate members 1 and 1 arranged opposite to each other. The magnetic shield member set 20 is arranged substantially in parallel between the two plate members 1 and 1 with a predetermined interval so that the plane portions (surfaces having the largest area) face each other. This distance preferably satisfies the condition of the expression (1). In this case, Sa in the expression (1) is the area of the cross section of the space (interval) between the adjacent magnetic shield member sets 20 and 20. Further, the magnetic shield members 2 and 2 of the set of magnetic shield members 20 are arranged substantially in parallel through a predetermined interval so that the plane portions (the surfaces having the largest area) face each other. It is set to be equal to or slightly larger than the thickness of the magnetic shield member 2.

  The magnetic shield member set 20 is sandwiched between the adjacent heat insulating members 6 and 6 and held between the two plate members 1 and 1. Therefore, the magnetic shield member 2 is a plate member in the same manner as described above. The magnetic shield member 2 is not fixed directly to the magnetic shield member 2 but is movable in the longitudinal direction. A thin heat insulating member 6 is also interposed between the pair of magnetic shield members 2 and 2 of the magnetic shield member set 20. Furthermore, the front surface and the rear surface of the heat insulating member 6 disposed at the foremost part and the rearmost part of the magnetic shield panel 3 are covered with the covering pieces 11 of the respective plate members 1. Further, the heat insulating member 6 is exposed at the two end surfaces not covered with the covering piece 11 of the magnetic shield panel 3 and the connecting portion 12 of the magnetic shield member 2 disposed between the plate members 1 and 1 from these end surfaces. Is protruding. The other structure is formed similarly to the duct structure 10 of FIG.

  The duct structure 10 of FIG. 8 combines the lower panel 3a formed as the magnetic shield panel 3 as shown in FIG. 2B, the two side panels 3c, and a plurality of magnetic shield members 2, 2,. Can be formed. That is, first, the lower panel 3a is disposed so that the longitudinal direction of the magnetic shield member 2 is substantially horizontal, and then the side panels 3c are respectively disposed on both sides of the lower panel 3a. At this time, the side panel 3c is arranged so that the longitudinal direction of the magnetic shield member 2 is substantially vertical. Further, as shown in FIG. 10, the magnetic shield member of the lower panel 3a is interposed between the lower connecting portions 12 and 12 of the pair of magnetic shield members 2 and 2 constituting the magnetic shield member set 20 of the side panel 3c. Two connecting parts 12 are inserted. Next, fixing with screws or clips in the state where the connecting portion 12 of the magnetic shield member 2 of the lower panel 3a is sandwiched back and forth by the lower connecting portions 12 and 12 of the magnetic shield member 2 and 2 of the side panel 3c. Connect with tools. By connecting the magnetic shield member 2 of the lower panel 3a and the magnetic shield member set 20 of the side panel 3c one by one in this way, the side panel 3c is attached to both sides of the lower panel 3a, and the lower panel The magnetic shield member 2 of 3a and the magnetic shield member set 20 of the side panel 3c are mechanically and electrically connected. Next, the same outer cover 13 and inner cover 14 as those described above are attached across the lower panel 3a and the side panel 3c.

  Next, the magnetic shield member 2 is disposed across the upper ends of the side panels 3c and 3c arranged to face each other. At this time, as shown in FIG. 11, the magnetic shield member disposed on the upper side between the pair of magnetic shield members 2 and 2 on the upper side of the pair of magnetic shield members 2 and 2 constituting the magnetic shield member set 20 of the side panel 3c. Two connecting parts 12 are inserted. Next, the connecting portion 12 of the magnetic shield member 2 is connected to the upper and lower connecting portions 12 and 12 of the magnetic shield members 2 and 2 of the side panel 3c with a fixing tool such as a screw or a clip. Connect. By connecting the magnetic shield member 2 arranged on the upper side and the magnetic shield member set 20 of the side panel 3c one by one in this way, a plurality of magnetic shield members 2, 2,... The upper magnetic shield member 2 and the magnetic shield member set 20 of the side panel 3c are mechanically and electrically connected to each other so as to face each other substantially in parallel. In this way, a duct structure 10 as shown in FIG. 8 can be formed.

  In this duct structure 10, a space surrounded by the lower panel 3 a, the upper magnetic shield members 2, 2... And the two side panels 3 c is formed as an insertion space 5. An opening is formed at the front surface and rear surface. Then, by arranging the plurality of duct structures 10 in the same manner as described above, the cable duct of the present invention can be formed. In this cable duct, the insertion space 5 is open on the upper side. The heat generated from the cable 4 inserted into the insertion space 5 can be easily released, and thermal deterioration of the cable 4 can be reduced.

  The size of the magnetic shield panel 3 and the number of magnetic shield members 2 with respect to one magnetic shield panel 3 can be appropriately set according to the voltage (several thousand volts or more) supplied by the cable 4 or the construction site. 2A and 2B, for example, the length L of the magnetic shield panel 3 in the front-rear direction L = 1000 mm, the interval P between adjacent magnetic shield members 2 = 150 mm, and the magnetic shield panel 3 Length Q = 50 mm from the front end or rear end to the magnetic shield member 2 positioned at the most front side or rear side, protrusion length S = 55 mm from the end face of the magnetic shield panel 3 of the connecting portion 12, thickness of the magnetic shield panel 3 Length T = 52 mm, length R1 = 6 in the direction perpendicular to the front-rear direction in the magnetic shield panel 3 used as the lower panel 3a or the upper panel 3b In the magnetic shield panel 3 used as the side panel 3c, the length R2 in the direction orthogonal to the front-rear direction is 200 mm, and the number of the magnetic shield members 2 with respect to one magnetic shield panel 3 can be set to seven. . Also, in order to adjust the overall length of the cable duct, as shown in FIGS. 12 (a) and 12 (b), the length L in the front-rear direction is made larger than that in FIGS. 2 (a) and 2 (b). A short magnetic shield panel 3 formed short (for example, L = 550 mm) can also be formed. In this case, the number of magnetic shield members 2 with respect to one magnetic shield panel 3 can be set to four.

It is a perspective view which shows an example of embodiment of this invention. An example of a magnetic shield panel same as the above is shown, and (a) and (b) are perspective views. It is a perspective view which shows an example of a magnetic shielding member same as the above. An example of a magnetic shield panel same as the above is shown, (a) and (b) are sectional views. It is the schematic which shows the heat insulation member and magnetic shielding member same as the above. It is explanatory drawing which shows an example of the manufacturing method of a magnetic shield panel same as the above. It is a perspective view which shows the assembly method of a duct structure same as the above. It is a perspective view which shows the other examples of a duct structure body same as the above. The other example of a side panel same as the above is shown, (a) is a perspective view, (b) is sectional drawing. It is a perspective view which shows the connection of the same lower panel and side part panel. It is a perspective view which shows the connection of a side panel same as the above and a magnetic shield member. The other example of a magnetic shield panel same as the above is shown, (a) (b) is a perspective view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Board | plate material 2 Magnetic shield member 3 Magnetic shield panel 4 Cable 5 Insertion space 6 Heat insulation member 7 Heat radiation part

Claims (7)

  A cable duct for inserting and laying a cable. A magnetic shield member made of a magnetic material is provided on a plate material to form a magnetic shield panel, and magnetic shield members of a plurality of magnetic shield panels are connected to each other. A cable duct characterized by forming an insertion space for inserting a cable.   The cable duct according to claim 1, wherein the cable is in a positional relationship where the axial direction of the cable and the plate surface of the magnetic shield member intersect.   The cable duct according to claim 1 or 2, wherein the cable in the insertion space and the thickness direction of the magnetic shield member are substantially parallel to each other.   4. The cable duct according to claim 1, wherein a magnetic shield member is provided between two or more plate members.   The cable duct according to any one of claims 1 to 4, further comprising a heat dissipating part for releasing heat generated from the cable.   The cable duct according to claim 1, wherein the magnetic shield member is held by a heat insulating member. 7. The cable duct according to claim 6, wherein the heat insulating member has fire resistance.

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