JPH0247162B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD OF THE INVENTION This invention relates generally to control centers, and more particularly to an insulated support arrangement for a vertical bus bar of a control center.

Generally, in a control center that houses a large number of control units, vertical busbars for three phases are arranged near the center of the cross section of the box. The vertical busbar used has a Z-shaped cross section in order to have great strength to withstand electromagnetic forces caused by short circuits and the like.

[Prior art]

An example of a conventional insulating support device for the Z-shaped cross-section bus bar is disclosed in Japanese Utility Model Publication No. 58-9477. The insulating supports used above hold only the legs of the Z-section bus bar extending forward and rearward of the control center.

By the way, in a single-sided control center where the control unit is not housed on the back side, in order to save material for the busbar, it is possible to have an L-shaped cross section without the rear leg where the control unit is not plug-in connected. Although desirable, the conventional insulating supports described above are incapable of holding L-shaped cross-section busbars.

Further, in order to increase the current capacity of the Z-shaped cross section, a rectangular cross-section generatrix is superimposed on the middle part of the front leg and the rear leg and bolted together. For this reason, there was a drawback that a complicated work process was required.

[Summary of the invention]

This invention was made in order to eliminate the above-mentioned drawbacks, and provides an insulating support frame having a protrusion that compresses the middle part of a Z-shaped cross section or an L-shaped cross section, and a protrusion that regulates the left and right direction of the middle part. In particular, it is an object of the present invention to provide an insulating support device for a vertical busbar of a control center, which eliminates the drawbacks of the prior art devices mentioned above. In addition, both insulating supports should be provided with an inclined surface between the adjacent generatrix bars, and in the part where the tightening bolt member is passed, a cylindrical projection should be provided on one side, and a circular recess into which this projection fits should be provided on the other side. The object of the present invention is to provide an insulating support device for a vertical busbar of a control center, which increases the creepage insulation, shortens the lateral profile, and miniaturizes the control unit.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6. In the figure, numeral 10 indicates the entire double-sided control center, which is usually installed in multiple rows. 12 is a control unit; 13 is a unit section in which the control unit 12 is housed in multiple stacks within the control center box; and 14 is a vertical wiring section.

The cross section of the control center 10 is shown in FIG.
2 is a vertical mounting frame arranged in the middle in the depth direction. The above corner pillar 20, intermediate pillar 21, vertical mounting frame 2
2 are connected at the top and bottom by a horizontal frame 23.
Reference numeral 25 indicates a partition plate that separates the unit compartments 13 from each control unit 12, and 25a indicates guide rails formed at both ends of the partition plate.

Next, the configuration of a typical control unit 12 will be explained. 31 are left and right side plates 31a, back plate 31b
32 is a horizontal member connecting the left and right side plates 31a, and 33 is an instrument mounting plate. 34 is a mounting rail provided on the outer surface of the unit case side plate 31a. A connector 35 for plug-in connection with the vertical bus bar 50 is provided on the unit case back plate 31b. In addition, the equipment mounting plate 33 includes a circuit breaker 36 and an electromagnetic switch 3.
7. A terminal block 38 and the like are provided. and 39
is an operation handle device for operating the circuit breaker 36 from outside the door 30 of the control unit.

The three-phase vertical busbar 50 is arranged within a vertical busbar section 15 formed by the vertical mounting frame 22 and the unit case back plate 31b. The vertical generatrix 50 includes an intermediate portion 50a parallel to the front of the control center 10;
The front leg part 50b is bent at a right angle from the intermediate part 50a and is further folded back, and the rear leg part 50c is bent in the opposite direction to the front leg part 50b and folded back in the same manner. ing. A connector 35 of a control unit is plug-in connected to the front leg portion 50b and the rear leg portion 50c from the front and back. In the case of a single-sided control center in which the control unit 12 is not housed on the rear side, the vertical generatrix 50 can be configured in an L-shaped cross section without the rear leg 50c.

The three-phase vertical busbar 50 is sandwiched between two horizontally extending front and rear insulating supports 60, 60.

The insulating support 60 has a busbar groove 61 that receives the front leg portion 50b or rear leg portion 50c of the busbar, and an intermediate protrusion 62 that forms one wall of the busbar groove 61 and comes into contact with and compresses the surface of the intermediate portion 50a of the busbar. , forming the other wall of the generatrix groove 61, and forming the intermediate portion 50 of the generatrix.
Side protrusions 63 and 65 are provided that extend further back than a. The side protrusion 63 located between the phases has an inclined surface 64 and is continuous with the intermediate protrusion 62, and is designed to prevent the side protrusions 63 from colliding with each other when the two are combined. A zigzag gap is formed between the phases, and as a result, a large creepage insulation distance can be secured.

The side protrusions 63 and 65 each have a circular recess 6.
6 and 67 are formed. Numerals 68 and 69 are cylindrical protrusions arranged symmetrically so as to fit into the circular recesses 66 and 67, respectively, when the pair of insulating supports 60 face each other.

Said circular recesses 66, 67, cylindrical projections 68, 69
By this combination, the bolt member passing therethrough is insulated from the bus bar. Busbar groove 61 of insulating support 60
is provided with a horizontal U-shaped groove 70 on the back side, in which a support fitting 80 or 81 is disposed. A deep narrow groove 71 close to the busbar groove 61 is formed above and below the U-shaped groove 70 to provide a large creepage insulation distance between the support fittings 80, 81 and the busbar 50. The support fittings 80, 81 generally have a groove-shaped cross section, and the support fitting 80 is fixed to the vertical mounting frame 22 of the control center box. The support fittings 80 and 81 are tightened by bolt members 90. The insulating support 60 and support fittings 80, 81 are assembled at least two times apart from each other in the longitudinal direction of the bus bar.
More than one set will be arranged.

The vertical generatrix 50 has an intermediate portion 50 as shown in FIG.
The current capacity can be increased by superimposing the bus bar 51 with a rectangular cross section on a. Contact pressure is obtained by compressing the vertical busbar 50 and the rectangular busbar 51 via the support members 80 and 81 with the intermediate protrusion 62 of the insulating support 60, but in order to ensure this,
A bolt member 91 is added between the phases. One width direction edge of the rectangular generatrix 51 is the vertical generatrix front leg portion 50
b, and the other width direction edge abuts on the side protrusion 63 or 65 of the insulating support. With the above configuration, the rectangular bus bar 51 does not move or deform even if electromagnetic force is applied due to a short circuit accident.
There is no need for direct bolt-tight assembly with the vertical bus bar as in the past.

Further, as another embodiment of the present invention, as shown in FIG. 6, two vertical generatrix lines 52 each having an L-shaped cross section can be used back to back. As described in FIG. 5, electrical contact can be established between the two parts 52 and 52 without bolting and assembly, and they can be firmly held.

In addition, according to the embodiment of the present invention, (a) it is configured to hold the leg portions of the vertical generatrix and compress the intermediate portion thereof, so that it can be used with either the vertical generatrix having an L-shaped cross section or a Z-shaped cross section. .

(b) The height (H) of the insulating support (Fig. 4) can be reduced because a large creepage distance from the busbar is ensured by the deep horizontal grooves above and below the U-groove in which the support member is housed. . This can reduce interference with the connector of the control unit, which is advantageous for downsizing the control unit (reducing the height dimension).

(c) A pair of opposing insulating supports are provided with an inclined surface between adjacent busbars, and a cylindrical projection is provided on one side where the tightening bolt member is passed, and a circular recess into which the projection fits into the other side. By providing an increased creepage distance, the supporting device can be shortened laterally and the control unit can be made smaller.

〔Effect of the invention〕

As described above, in this invention, the Z-shaped cross section or the
By using an insulating support having a protrusion that compresses the middle part of the bus bar with a letter-shaped cross section and a protrusion that restricts the left-right direction of the middle part, it is possible to easily assemble the bus bar with a Z-shaped cross section or an L-shaped cross section, Since the insulating support can be firmly held and fixed, and the creepage insulation distance of the insulating support is increased, the width of the support device can be shortened and the control unit can be miniaturized.

[Brief explanation of drawings]

The figures are for explaining a busbar insulating support device according to an embodiment of the present invention, in which Figure 1 is a perspective view of a control center, Figure 2 is a sectional view taken along the line - in Figure 1, and Figure 3 is a vertical busbar. FIG. 4 is a perspective view of the above-mentioned insulating support, FIG. 5 is a plan view showing another embodiment corresponding to FIG. 3, and FIG.
This figure is a plan view showing another embodiment corresponding to FIG. 3. In the figure, 10 is a control center, 12 is a control unit, 20 is a Z-shaped vertical busbar, 50a is an intermediate part, 50b is a front leg part, 50c is a rear leg part, 51
is a rectangular busbar, 52 is an L-shaped vertical busbar, 60 is an insulating support, 61 is a busbar groove, 62 is an intermediate projection, 63, 6
5 is a side protrusion, 71 is a narrow groove, and 80 and 81 are supporting members.

Claims (1)

[Claims] 1. A box body incorporating a plurality of vertical generatrixes located in parallel and spaced apart, the vertical generatrixes having an intermediate portion parallel to the front surface of the box body and legs perpendicular to the intermediate portion. In a control center configured to be plug-in connected to a plurality of control units stacked and housed in a box, the vertical bus bar leg has an L-shaped cross section or a Z-shaped cross section with a section. , the vertical bus bar is sandwiched between two insulating supports at the front and rear that are spaced apart from each other in the longitudinal direction, and each of the insulating supports includes at least a bus groove for receiving the legs of the vertical bus bar, and one side of the bus groove. an intermediate protrusion forming a wall and abutting and compressing the intermediate portion of the vertical generatrix; and a side protrusion forming the other wall of the generatrix groove and extending deeper than the intermediate portion of the vertical generatrix; Support metal fittings are provided on the back of each support and connected to tighten from the front and back, and on the opposite sides of both of the insulating supports, an inclined surface is provided between adjacent busbars, and a tightening bolt is provided. An insulating support device for a vertical bus bar of a control center, characterized in that a cylindrical protrusion is provided on one side of the part through which the member passes, and a circular recess into which the protrusion fits is provided on the other side, thereby increasing the creepage insulation distance. 2. The rectangular busbar superimposed on the middle part of the vertical busbar is restricted from moving in the left-right direction by the vertical busbar legs and the side protrusions of the insulating support, and is compressed by the intermediate protrusion of the insulating support. An insulating support device for a vertical bus bar of a control center according to claim 1, wherein an electrical contact pressure is obtained. 3 The above-mentioned support fittings are attached to the U formed on the back of the insulating support.
Insulation of the vertical bus bar of the control center according to claim 1, characterized in that the vertical busbar insulation of the control center is disposed in the U-shaped groove, and narrow grooves are formed above and below the U-shaped groove and are tangential to the busbar groove. Support device.