JPS6013214Y2 - Busbar support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a busbar support device that supports a plurality of busbars arranged in parallel at predetermined intervals on a fixed part.

Conventionally, as shown in FIG. 1, FIG. 2, and FIG. 3, in this type of device, a bus bar 1 arranged parallel to each other at a predetermined interval is sandwiched between two insulating members 2 and 3. Furthermore, this insulating member 2
, 3 are sandwiched between two support fittings 4.5.

Then, a through hole 6 is made from one support metal fitting 4 side to the other support metal fitting 5 side.

A through bolt 7 is inserted into this hole 6, and a nut 9 is placed on the opposite side of the bolt head 8 and tightened to tightly tighten the assembly of the bus bar 1 and the insulating members 2 and 3 between the support fittings 4 and 5.

At least one of the support fittings 4 and 5 is fixed to the fixing part 10.

According to this, as is clear from the figure, the support fittings 4,
5, the through bolt 7, and the nut 9, a closed magnetic path is formed around the bus bar 1.

Therefore, when a current is applied to the bus bar 1, the current flows to the support fittings 4, 5 and the through bolt 7, and the temperature of these parts increases due to the resistance loss caused by this. They are used for power distribution boards, etc., but when losses occur in the parts mentioned above and the temperature rises, the temperature inside the power distribution board increases, which limits the mounting density of electrical appliances mounted inside. Alternatively, the rated current flowing through the bus 1 must be kept small.

Furthermore, highly sealed power distribution boards, such as dust-proof type, are not only subject to the above-mentioned restrictions, but also require consideration of forced ventilation.

Therefore, conventionally, in order to interrupt the magnetic path formed around the bus bar 1, the support metal fitting 4 is divided into two parts as shown by broken lines in FIG. 2, and the magnetic path is thereby interrupted. I was doing it.

However, according to this method, since the support fitting 4 is divided into two, not only the mechanical strength is reduced, but also
It also had the disadvantage of being troublesome to assemble.

In addition, in order to interrupt the magnetic path, supporting metal fittings 4, 5,
Alternatively, one or both of the through bolts 7 may be made of a non-magnetic material, but non-magnetic materials have the disadvantage that they are generally expensive.

The present invention was devised to solve the above-mentioned drawbacks, and consists of a plurality of busbars arranged in parallel at a predetermined interval, sandwiched between two insulating members, and then inserted from the outside. It is sandwiched between two supporting metal fittings, a through hole is made from the one supporting metal fitting side to the other supporting metal fitting side, a through bolt is inserted into the through hole, and the aforementioned fastening tool consisting of the through bolt and nut is used. In the device in which the assembly of the bus bar and the insulating member is tightly fastened between support fittings, the gap between the through hole provided in the support fitting and the outer surface of the support fitting and the facing surface of the fastening fitting. The present invention relates to a busbar support device in which a non-magnetic material is interposed between the support metal fittings and the fasteners to interrupt a magnetic path formed around the busbar.

With this configuration, the magnetic path formed around the bus bar can be more reliably interrupted with a relatively inexpensive and simple configuration without reducing mechanical strength, and loss can be reduced.

An embodiment of the present invention shown in FIG. 4 will be described below.

In addition, in the figures, the same reference numerals as in FIGS. 1, 2, and 3 indicate the same parts.

That is, according to the present invention, the support fitting 4 and the through bolt 7
A non-magnetic material 12 is interposed in the contact portion with.

As shown in FIG. 5, this non-magnetic material 12 is
The bushing part 13 that fits into the through hole 6 bored in the through-bolt 7 and the seat part 14 of the through-bolt 7 are shaped like one body.

Of course, the bushing part 3 and the seat part 14 may be constructed separately.

Various magnetic materials can be used as the material, such as polyester resin, stainless steel, aluminum, brass, etc., but it is more preferable to use a non-magnetic and non-conductive material.

By doing this, the support metal fitting 4 can be
The contact with the through hole 6 drilled in is cut off, and the bolt head 8 is cut off from contact with the support fitting 4 via the washer 15 by the seat portion 14.

Therefore, this component can interrupt the magnetic path.

The configuration is extremely simple, with the addition of the non-magnetic material 12, and the workability is almost the same as the conventional configuration that does not take into account the interruption of the magnetic path.

Further, the supporting metal fittings 4, 5 and the through bolt 7 can be made of an inexpensive magnetic material as in the conventional case.

Moreover, since there is no need to divide the auxiliary metal fitting 4 in order to interrupt the magnetic path, there is no reduction in workability or mechanical strength.

Further, since the non-magnetic material 12 can be made into an extremely simple item such as a washer, it can be constructed at low cost.

In the above embodiments, a case has been described in which a non-magnetic material is interposed at the contact portion between the bolt head 8 side of the through bolt 7 and the support fitting 4, but this may be provided at the nut 9 side.

Furthermore, in the figure, there are four locations where the fastener composed of the through bolt 7 and nut 9 comes into contact with the supporting metal fittings 4 and 5, and the non-magnetic material 12 must be interposed at at least one of these locations. That's enough.

However, if more certainty is desired, it may be provided at all locations or at multiple locations.

Further, the shape of the non-magnetic material 12 interposed in the contact portion is not limited to the above-mentioned shape, and it is also possible to adopt another shape based on the technical idea of the present invention.

As described above, the present invention is designed to interrupt the magnetic path formed around the bus bar by interposing a non-magnetic material in the contact area between the fastener, which is composed of a through bolt and a nut, and the support metal fitting. Because of this, the magnetic path can be more reliably interrupted with a simple configuration, at low cost, and without compromising mechanical strength.
Loss caused by the formation of the magnetic path can be drastically reduced.

[Brief explanation of drawings]

1 and 2 are a front cutaway view and a bottom view showing a conventional example, FIG. 3 is a cutaway side view taken along line 3-3 of FIG. 1, and FIG. 4 is a cutaway side view showing a conventional example. Partially enlarged view showing the example, No. 5
The figure is a perspective view showing an example of the shape of a non-magnetic material. 1... Bus bar, 2, 3... Insulating member, 4
, 5... Support metal fittings, 7... Through bolts, 9... Nuts, 12... Non-magnetic material.

Claims (1)

[Scope of utility model registration request] A plurality of busbars arranged parallel to each other at a predetermined interval are sandwiched between two insulating members, which are further sandwiched between two support fittings from the outside, and the other support is placed from the side of the one support fitting. Drill a through hole to the metal fitting side, insert a through bolt into the through hole, and tightly tighten the assembly of the bus bar and the insulating member between the support metal fittings using the through bolt, nut, and tightening tool. wherein a non-magnetic material is interposed between the through hole provided with the support fitting, the outer surface of the support fitting, and a surface facing the fastener, so that the support fitting and the fastener are A bus bar support device configured to interrupt a magnetic path formed around the bus bar.