JP2000152471A - Bus duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a bus duct, wherein the number of its parts is small to facilitate its assembling, and its manufacturing cost can be suppressed, and furthermore, its weight is reduced to treate it satisfactorily at site. SOLUTION: In the structure of a bus duct for storing therein a plurality of insulated conductors over the whole periphery of each band-plate form conductor 1, of which an insulator is applied and which are superimposed on each other via their widest surfaces, symmetrically with each other two cases are combined each of which comprises a lateral U-shaped section bearing channel portion 3, an I-shaped section bearing protrusive portion 3a formed on one of the upper and lower portions of the channel portion 3, and a lateral U-shaped section bearing protrusive portion 3b formed on the other of the upper and lower portions of the channel portion 3. Then, a plurality of insulated conductors are stored in the space formed out of the channel portions 3, and the channel portions 3 are joined to each other by a joining means in each joining portion of the I-shaped section bearing protrusive portion 3a to the lateral U-shaped section bearing protrusive portion 3b. As the insulator of the insulated conductor, preferably a heat-shrinkable tubing may be used. As the joining means, a bolt and nut are used, and the nut may be fixed in a cavity portion 3c of the lateral U-shaped section bearing protrusive portion 3b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bus duct used as a power trunk for buildings and factories, and more particularly to a bus duct of this type suitable as a small-capacity vertical trunk and a horizontal trunk in a medium-sized building. The configuration of the bus duct according to the present invention is based on a so-called insulated bus duct in which a plurality of insulated conductors each having an insulating material applied to the entire circumference of the strip-shaped conductor are superimposed on each other on a wide surface thereof and housed in the duct.

[0002]

2. Description of the Related Art Conventionally, a bus duct of this type has a structure as shown by reference numeral 50 in FIG. 4, and has an insulating conductor 52 such as a tape or a film provided on the entire circumference of a strip-shaped conductor 51. Are accommodated in the duct in parallel so that their wide surfaces overlap each other.

The duct has a main frame composed of left and right duct plates 53 having a U-shaped cross section and upper and lower duct covers 55, and the left and right duct plates 53 sandwich the insulated conductor from the parallel direction. The insulating conductor is fastened at regular intervals in the longitudinal direction (the direction of the front and back of the paper) by fastening means 54 such as bolts and nuts, so that the insulated conductor is connected to the left and right duct plates 53.
They are fixed in close contact with each other. Further, the duct cover 55 is provided above and below the duct plate 53 fastened as described above.
Is fixed by a fastening means such as a bolt 56 to serve also as a reinforcing portion.

The bus duct 5 constructed as described above
0 is usually laid on a route by connecting a plurality of cables by a connecting member, and a branch cable is output from a connecting portion or a plug-in branch portion provided at an arbitrary position, and power is supplied to loads at various places. It is provided as a power trunk.

[0005]

According to the above-mentioned prior art bus duct (FIG. 4), it is necessary to wind a tape or film-like insulator around a strip-shaped conductor, and furthermore, the left and right duct plates and the vertical Because the duct cover is composed of duct covers and these are connected by fastening means such as bolts,
The number of parts was large and the assembly was complicated, leading to an increase in manufacturing costs. In addition, since the duct plate and the duct cover are generally made of a steel plate, the weight of the duct plate and the duct cover are increased together with the internal conductor, and there is a problem that the handling property is not good when laying on site. Further, there is a problem that the cross-sectional area is increased from the viewpoint of securing the strength and the occupied space in the building is increased.

Therefore, an object (object) of the present invention is to reduce the number of parts, facilitate assembly, reduce the manufacturing cost, and achieve a light weight and good on-site handling. To provide a bus duct.

[0007]

The bus duct provided by the present invention is a cross-section duct having a plurality of insulated conductors provided with an insulator on the entire circumference of a strip-shaped conductor. Two cases each having a U-shaped channel portion, an I-shaped cross-section overhang formed on one of the upper and lower portions of the channel portion, and a U-shaped cross-section overhang formed on the other of the upper and lower portions, A symmetrically combined structure, the insulated conductor is housed in the space formed by the channel portion, and the insulated conductor is fastened by fastening means at a joint portion between the I-shaped cross-section and the U-shaped cross-section. ,
The number of parts is small, which facilitates assembling, contributes to a reduction in manufacturing cost, and is lightweight and can be easily handled.

By using a heat-shrinkable tube as an insulator of the insulated conductor, the production can be further facilitated.

[0009] A bolt and a nut are used as the fastening means, and the nut is locked in the concave portion of the U-shaped overhanging portion, so that the nut is prevented from rotating and the assembly at the time of bolt tightening is further facilitated. Can be.

[0010]

1 and 2 show a first embodiment of a bus duct according to the present invention. The bus duct denoted by reference numeral BD in this embodiment is a plurality (three) of insulated conductors whose entire circumference is insulated by a heat-shrinkable tube 2 from a strip-shaped conductor 1 made of a conductive metal such as copper or aluminum.
In a duct.

Thus, the duct comprises a pair of left and right cases 3, 3, which have the same shape.
That is, the case 3 mainly includes a channel portion (3) having a U-shaped cross section, and forms an I-shaped cross-section overhang 3a at one of the upper and lower portions, and forms a U-shaped cross-section overhang 3b at the other of the upper and lower portions. are doing. The case 3 having such a shape can be obtained from an extruded profile of an aluminum alloy.

The cases 3 shaped as described above are combined so as to be symmetrical with each other by 180 degrees, and the insulated conductor is housed in a rectangular space obtained by combining the channel portions 3 having a U-shaped cross section. In the part, the bolt 4 penetrates through a portion where the cross section I-shaped overhanging portion 3a and the U-shaped cross-section overhanging portion 3b are to be the concave portions 3c, and is fastened by tightening with the nut 4a. . In this case, the nut 4a is locked in the concave portion of the U-shaped overhang portion 3b, so that the nut 4a is prevented from rotating.
Is performed, the assembly becomes very easy.

The bus duct BD assembled as described above is used as a power trunk by connecting a plurality of bus ducts BD by connecting members and supplying power to the load through a branch line from the connecting portion or the like. .

According to the bus duct of the first embodiment, the insulation of the strip-shaped conductor is performed by the heat-shrinkable tube, thereby facilitating insulation processing. The case is made of an extruded aluminum alloy material. Since the two are combined in a 180-degree symmetrical manner and the conductor is included and fastened at the upper and lower parts, the number of parts is small, the assembly is remarkably easy, and the manufacturing can be performed at low cost. Furthermore, since the case has a structure having a d-shaped I-shaped overhanging portion and an U-shaped overhanging portion at the upper and lower portions, sufficient strength can be provided in both the vertical and horizontal directions. The cross-sectional dimensions can be reduced, and space saving during construction can be achieved. In addition, the conductor and case are made of aluminum alloy to reduce the weight (Fig. 4)
, And can be excellent in transportability and handleability.

FIG. 3 shows a second embodiment of the bus duct according to the present invention, which is basically the same as the first embodiment described above (the same reference numerals are used as in FIG. 1). The rivet 5 is formed.

In the above-described first embodiment (second embodiment), a heat-shrinkable tube is used to insulate the strip-shaped conductor. However, in some cases, extrusion of plastic such as vinyl chloride resin, film, or tape is performed. May be employed. As for the case, a roll forming material can be used in addition to the extruded aluminum profile.

[0017]

According to the present invention as described above,
The desired object of providing a bus duct which has a small number of parts, is easy to assemble, can reduce the manufacturing cost, and is lightweight and has good on-site handling properties can be achieved.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of a bus duct according to the present invention,
(1) is an explanatory cross-sectional view, and (2) is a partial side view.

FIG. 2 is an explanatory perspective view of the bus duct shown in FIG. 1;

FIG. 3 is a cross-sectional explanatory view showing a second embodiment of the bus duct according to the present invention.

FIG. 4 is an explanatory cross-sectional view showing an example of a conventional bus duct.

[Explanation of symbols]

 BD Bus duct 1 Strip-shaped conductor 2 Heat-shrinkable tube 3 Case (C-shaped channel section) 3a I-shaped cross-section overhang 3b Cross-section U-shaped overhang 3c Recess 4 Bolt 4a Nut 5 Rivet

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masatoshi Hata 5-1-1, Hidaka-cho, Hitachi City, Ibaraki Prefecture Inside the Hidaka Plant, Hitachi Cable Co., Ltd. (72) Inventor Masatoshi Kikuchi Hidaka-cho, Hitachi City, Ibaraki Prefecture 4-12-1 Hitachi Cable Equipment Co., Ltd. F term (reference) 5G365 AA03 AB02 CA07 CB01 CB04 CD07

Claims (3)

[Claims] 1. A structure in which a plurality of insulated conductors having an insulating material provided over the entire circumference of a strip-shaped conductor are stacked on a wide surface thereof and housed in a duct, and the duct has a U-shaped cross section. A symmetrical combination of two cases each having a channel portion, an I-shaped cross-section formed on one of the upper and lower portions of the channel portion, and a U-shaped cross-section formed on the other of the upper and lower portions. The insulated conductor is housed in a space formed by the channel portion, and is fastened by fastening means at a joining portion of the I-shaped cross section and the U-shaped cross section. Bus duct. 2. The bus duct according to claim 1, wherein a heat-shrinkable tube is used as an insulator of said insulated conductor. 3. The bus duct according to claim 1, wherein a bolt and a nut are used as the fastening means, and the nut is locked in a concave portion of the U-shaped overhang.