JPH0314898Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field of the Invention) The present invention relates to a bus duct used as a power supply line with a large current capacity.

(Technical background of the invention and its problems) As a large current bus duct using a plurality of conductors per conductor, the one shown in FIG. 3 is known.

That is, the upper phase conductors 2a, 2b, 2c arranged in the housing 1 along its longitudinal direction.
The supporting grooves 3a and 4a of the insulating holders 3 and 4 are arranged in the upper and central parts of the housing 1, so that the lower phase conductors 2a', 2b' and 2c' are insulated in the lower part and in the central part of the housing 1. They are supported by support grooves 5a and 4b of the holders 5 and 4, respectively.

However, in a bus duct with such a configuration, the shapes of the central insulation holder 4 and the upper and lower insulation holders 3 and 5 are different, so at least two types of insulation holders must be manufactured, and therefore parts management is difficult. This was troublesome and, in some cases, resulted in assembly errors.

(Purpose of the invention) The present invention has been made with attention to these points, and is intended to provide a bus duct that allows mass production of holders and prevents assembly errors.

(Summary of the invention) The bus duct according to the invention has three insulating holders each having a plurality of annular grooves provided at equal intervals along the axial direction on the circumferential surface of the housing. The upper conductors are spaced apart from each other along the longitudinal direction of the housing and perpendicular to the longitudinal direction of the housing, and are arranged between the upper and central insulating holders along the longitudinal direction of the housing. The lower conductor, which is arranged along the longitudinal direction of the housing between the center and lower insulating holders, is supported by the annular grooves of the insulating holders.

(Embodiments of the invention) Hereinafter, embodiments of the invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view of a bus duct according to the present invention, and FIGS. 2 a and 2 b are a sectional view and a side view of an insulating holder constituting the bus duct of the present invention. In these figures, the bus duct according to the present invention includes a housing H. This housing H includes a bottom plate 6, a pair of side plates 7, 7 fixed to opposite sides of the bottom plate 6 along the longitudinal direction thereof, and a lid plate fixed on these side plates 7, 7. It consists of 8. Inside this housing H, conductors 9 for each phase are arranged separately in two stages, upper and lower.
0 and 10 in the housing H, and the plurality of lower conductors 9 are supported by the supporting grooves 10a in the central and lower cylindrical insulating holders 10, 10.

The three insulating holders 10, which are spaced apart from each other along the longitudinal direction of the housing H and perpendicular to the longitudinal direction of the housing H, are formed in a cylindrical shape, for example, and Metal fittings 11, 11 are attached to both ends.

On the other hand, receiving metal fittings 7a are fixed at upper, middle and lower positions of the opposing wall surfaces of the side plates 7, 7 along the longitudinal direction of the housing H at predetermined intervals. These receiving fittings 7a are formed in a U-shape, and the bent portions at both ends protrude in a direction perpendicular to the plate surface of the side plate 7.

The metal fitting 11 includes a semicircular portion 11a formed to have a smaller diameter than the outer diameter of the insulating holder 10, and an extension portion 11b extending in the radial direction of the holder 10 and slightly protruding in the radial direction than the outer peripheral surface of the holder 10. The holder 10 is fixed by fixing the peripheral wall of the protrusion 11c protruding into the holder 10 and the inner peripheral wall of the holder 10 via a bonding agent 12 such as cement.
is installed on. And the insulation holder 10
A plurality of annular grooves 10a for supporting each conductor 9 are provided on the circumferential surface of the conductor 9 at equal intervals along the axial direction,
Further, a plurality of annular grooves 10b are provided between these annular grooves 10a and on both ends to ensure creepage distance.

Next, the assembly process of the high-pressure bus duct according to the present invention will be explained.

That is, the metal fittings 11, 11 of the insulating holder 10 to be placed below are placed on the receiving metal fittings 7a, 7a fixed to the lower inner wall surfaces of the pair of side plates 7, 7, with the protruding end surfaces of the respective extension parts 11b, 11b facing downward. Involve it so that it falls towards the target. As a result, each extension part 1
The insulating holder 10 can be disposed below the housing 1 with the protruding end surfaces of 1b and 11b in contact with the bottom plate 6.

Next, the lower phase conductors 9 are inserted into the supporting annular grooves 10a of the insulating holder 10 arranged above to support the lower portions of the conductors 9, and the receiving fittings 7a, 7a are fixed to the center of the side plates 7, 7. Then, the metal fittings 11, 11 of the insulating holder 10 to be placed in the center are inserted so that the protruding end surfaces of the respective extension parts 11b, 11b are directed upward.

Next, the central insulating holder 10 arranged above
The conductor 9 of each phase in the upper stage is placed in each annular groove 10a for support.
is inserted to support the lower part of the conductor 9, and the side plate 7,
The metal fittings 11, 11 of the insulating holder 10 to be arranged above are inserted into the receiving metal fittings 7a, 7a fixed above the metal fittings 7, so that the projecting end surfaces of the respective extension parts 11b, 11b are dropped upward. As a result, each supporting annular groove 10a of the insulating holder 10
The upper part of the conductor 9 of each phase in the upper stage can be inserted and supported. In this case, both metal fittings 11 of the upper insulating holder 10 have their extended portions 11b connected to the holder 10.
Since it protrudes beyond the outer periphery, this extension part 1
1b projects slightly upward from the upper end surface of the side plate 7.

Finally, a lid plate 8 is placed over the upper end surfaces of the side plates 7, 7, and the lid plate 8 is fixed to the side plates 7, 7 with bolts while pressing the end surfaces of the extension portions 11b, 11b of the metal fittings 11, 11.

By the way, if the extension part 11b of the metal fitting 11 is made to protrude from the outer periphery of the holder 10, the cover plate 8 can be bolted while pressing the end face of the extension part 11b. The insulating holders 10, 10, 10 can securely clamp and support. Therefore, even if the bus duct of the present invention is installed vertically, the conductor 9 will not come off the holder and fall from the bus duct.

In the above embodiment, the insulating holder 10 may be made of an insulating material such as porcelain or epoxy, or may be made of an inorganic material with good tracking resistance.

It goes without saying that the conductor 9 may be either a bare conductor or an insulated conductor.

Further, although the above embodiment shows an example in which the present invention is applied to a high-pressure bus duct, the present invention can also be applied to a low-pressure bus duct. In this case, it is sufficient to provide only the annular groove 10a for supporting the conductor in the insulating holder 10.

(Effect of the invention) According to the invention, by forming the insulating holder 10 in a cylindrical shape and providing the annular grooves 10a, 10a on the circumferential surface, it is possible to eliminate the need for an insulating holder having a special shape in the center. By simply disposing an insulating holder 10 identical to the insulating holder 10 used below in the center, the conductors 9 of each phase can be separated and supported in two stages. Therefore, since it is sufficient to use a type of insulating holder, mass production of the holder can be achieved, and assembly errors will not occur.

Further, according to the present invention, since the insulating holder is formed in a cylindrical shape, it is possible to effectively prevent dust from adhering to the insulating holder, and also to ensure creepage distance outside the annular groove on the holder circumferential surface. If a plurality of other annular grooves are provided, a sufficient creepage distance can be ensured even if the conductor spacing etc. are made small by simply using the insulating holder without using any other members. Furthermore, since the insulating holder has a simple structure in which an annular groove is provided in the cylindrical body, it is very easy to manufacture.

Therefore, it is possible to provide a bus duct with excellent electrical characteristics at low cost, and when an annular groove is provided on the holder circumferential surface to ensure creepage distance, assembly is extremely simple. can be provided at low cost. Furthermore, if the number of parts in the bus duct is small, transportation costs are reduced accordingly, and even in the case of high-voltage bus ducts, if the conductors are supported only with insulating holders as described above, the structure will be different from that of low-voltage bus ducts. Since they are the same, there are also advantages such as being able to use common jigs.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a high-pressure bus duct according to the present invention, FIGS. 2a and 2b are a sectional view and side view of an insulating holder according to the present invention, and FIG. 3 is a sectional view of a conventional bus duct. H...Housing, 9...Conductor, 7...Side plate,
7a...Bracket fitting, 8...Lid plate, 10...Insulating holder, 10a, 10b...Annular groove, 11...Metal fitting, 11b...Extension portion.

Claims (1)

[Claims for Utility Model Registration] (1) Three insulating holders each having a plurality of annular grooves provided at equal intervals along the axial direction on the circumferential surface of the housing are located at the upper, center and lower part of the housing. Upper conductors are spaced apart from each other along the longitudinal direction and perpendicular to the longitudinal direction of the housing, and are arranged between the upper and central insulating holders along the longitudinal direction of the housing. Due to the annular groove,
Further, a bus duct characterized in that lower conductors arranged along the longitudinal direction of the housing between the central and lower insulating holders are supported by annular grooves of these insulating holders, respectively. (2) The bus duct according to claim 1 of the utility model registration, characterized in that an annular groove for ensuring creepage distance is provided between the annular grooves of the insulating holder. (3) The upper and lower insulating holders are provided with metal fittings including an extension portion slightly protruding in the radial direction from the outer circumferential surface at both ends thereof, and the metal fittings are inserted into receiving metal fittings provided on opposing walls of the housing. The bus duct according to claim 1, wherein the bus duct is positioned within the housing. (4) The bus duct according to claim 1, wherein each of the insulating holders is made of an inorganic material.