JPH0343775Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a shutter device for a motor control center.

There are closed switchboards that have a power bus inside the housing and a disconnector that can be connected to and connected to the power bus, allowing you to insert and remove electrical equipment inside the housing. The panel body is equipped with a shutter to prevent the operator from inadvertently touching the power bus bar and causing an accident when inserting or removing drawer-type electrical equipment.
For safety, the power bus bar is automatically hidden when pulling out electrical equipment.

This kind of conventional safety shutter for a panel body will be explained using FIG. 1 and FIG. 1 is a bus bar that engages with the contact 2, 4 is a cover for pushing, etc., and 5 is a vertical frame inside the board. Then, electrical equipment 1 and bus bar 3
A shielding plate 7, which corresponds to each bus bar 3 and is provided with a through hole 6 that can penetrate each contactor 2, is horizontally movably supported between the two. 8 is the shielding plate 7
It is a horizontal drive part provided at one end of the holder, and is provided with a guide hole 9. This guide hole 9 has a portion parallel to the generatrix 3 and a portion diagonal, and engages the pin 10a. The pin 10a passes through a hole (not shown) provided in the vertical frame 5 and is protruded from an operating rod 10 that moves forward and backward parallel to the cross-sectional width direction of the generatrix 3, and a return spring 11 is wound around the operating rod 10. , the operating rod 10 is always energized and protrudes toward the electrical equipment 1 side. In addition, 1
A is a guide rail that guides the electric device 1 when it is pushed in.

Therefore, as shown in FIG. 1 to FIG. 2, when the electric device 1 is pushed toward the bus bar 3 side, the tip of the operating rod 10 first comes into contact with the back of the electric device 1, and the operating rod 10 is returned to the spring position. Push it into the vertical frame 5 side against the force of 11. When the pin 10a moves due to the movement of the operating rod 10, the pin 10a moves from one end 9a (diagonal portion) of the guide hole 9 to the other end 9b (parallel to the generatrix 3), and following this movement, the shielding plate 7 moves to the right in the figure. When the shielding plate 7 finishes moving, each bus bar 3 and each through hole 6 are configured to face each other, so if the electrical device 1 is continued to be pushed in, each contact 2 and each bus bar 3 will engage with each other. and power supply becomes possible.

On the other hand, as shown in FIG. 1, when the electrical device 1 is pulled out from the state shown in FIG. Return to. This movement of the operating rod 10 causes the pin 10a to move from the other end 9b of the guide hole 9 to the one end 9a, contrary to the above.
The shielding plate 7 moves to the left in the figure. When the shielding plate 7 moves to the left, each bus bar 3 and each through hole 6 do not correspond to each other and the positions shift, so that each bus bar 3
is shielded by a shielding plate 7 to ensure safety.

However, according to the above-described conventional configuration, the electrical device 1 must be pushed in against the force of the return spring 11, which requires a large operating force, and the reaction force of the return spring 11 is applied to one side of the electrical device 1. acts on the electrical equipment 1 to generate rotational force, and the guide rail 1
In addition to applying a force in an oblique direction to a, the pushing operation may not be smooth, and due to the rotation, there is a risk that the contact 2, the through hole 6, and the generatrix 3 may not be aligned. Furthermore, since the operating rod 10 moves back and forth parallel to the pushing direction, there is a problem that a space for allowing movement must be provided in the depth direction of the panel.

The purpose of the present invention is to eliminate such inconveniences in the conventional bus bar shutter device in the panel body, and to simplify the pushing operation of electrical equipment.
Further, it is an object of the present invention to provide a shutter device that has good alignment between the contact, the through hole, and the busbar, and can be downsized without forming an operation-permissible space.

The present invention will be explained in detail below with reference to FIGS. 3 to 9, which show examples of implementation in a motor control center.

Fig. 3 shows the entire double-sided multi-stage motor control center. In the figure, 12 is a housing, 13 is a door, and 14 is a unit device 19 (fourth
15 is a horizontal generatrix.

Figure 4 is the cross section X-X at the top of Figure 3.
In the figure, 16 is an electromagnetic contactor, 17 is a thermal relay, 18 is a circuit breaker, and 20 is a disconnector, all of which are devices housed in a unit device 19. 21 is a vertical bus bar and is protected by a bus bar cover 22. Further, 23 is a vertical frame of the housing 12, and 23a is a vertical frame 23 and a partition plate 23.
Guide rails 24 and 25 projecting perpendicularly to b represent rear frames, respectively. In the vertical frame 23, a shutter opening/closing drive section 26 is provided at the deepest part of the guide rail 23a.
The shutter opening/closing drive unit 2 is located between the rear frames 24 and 25.
Shutter plates 27 and 28 interlocked with 6 are guided and supported so as to be horizontally movable. Shutter plates 27, 28
is provided with through holes 35 and 36 that face each bus bar 21 and can face each bus bar 21.

Therefore, referring to FIG. 5, the shutter opening/closing drive section 2
6 and the shutter plates 27 and 28 will be described in detail.

The vertical frame 23 is provided with a C-shaped holder 32 fixed thereto by cutting out the deepest part of the guide rail 23a. A T-shaped movable arm 31 is fitted into this holder 32 through guide holes 32a, 32a so as to be vertically movable.
An operating rod 30 consisting of a pin protruding from the side of 1a is provided, and a spring 33 is interposed between the lower surface of the horizontal portion 31b having a sloped portion 31c at the tip and the holder 32, and the end of the guide rail 23a is provided with a spring 33. The movable arm 31 is always urged upward so that the heights of the lower end of the inclined surface 31c and the lower end of the inclined surface 31c are at the same height.

On the other hand, the rear frame 25 in contact with the vertical frame 23 is provided with an elongated hole 29 for penetrating the shutter plates 27 and 28 that engage with the operating rod 30 to guide movement. This elongated hole 29 is also bored in another rear frame 24 facing the rear frame 25. This elongated hole 29 is also bored in another rear frame 24 facing the rear frame 25, and supports the shutter plates 27, 28 horizontally.
The shutter plates 27 and 28 are two plate-like bodies each having through holes 35 and 36 corresponding to the through hole 39 bored in the bus bar cover 22, and a guide hole that engages with the operating rod 30. 37 and 38 respectively. Through the guide holes 37 and 38, the through holes 35 and 36 of the shutter plates 27 and 28 are aligned with each other and aligned with the through hole 39 of the bus bar cover 22 by the action of the operating rod 30. Note that 41 in the figure is a shelf board on which the unit device 19 is placed.

Therefore, the shutter plates 27 and 28 will be explained in detail with reference to FIGS. 6 and 7. When the operating rod 30 is engaged with the guide holes 37 and 38 and the operating rod 30 is in the upper position (see FIG. ), the through holes 35 and 36 have a slight width Z between them, and are configured so that they do not deviate from each other and match each other, and the width Z is located approximately at the center of the through hole 39 of the busbar cover 22. ing. In other words, when the operating rod 30 is in the upper position, the through holes 35, 3
6 and 39 do not match each other, so the through hole 39 of the busbar cover 22 is closed. On the other hand, operating rod 3
0 is below the guide holes 37 and 38 (7th
(FIG.), the through holes 35, 36, and 39 are arranged so that they coincide with each other and the through hole 39 is opened. For this reason,
The guide holes 37 and 38 correspond to the movement line Y-Y of the operating rod 30.
Vertical hole portions 37a and 38a that are long holes drilled in a symmetrical shape to form vertical play;
Diagonal hole portions 37b and 38b are provided to form a lateral movement of a certain length so that the through holes 35 and 36 coincide with each other. Note that only one of the shutter plates 27 and 28 may be used. Shutter board 2
7 and 28, the length of the oblique hole portions 37b and 38b of the guide holes 37 and 38 in the horizontal direction is such that the length of the oblique hole portions 37b and 38b of the guide holes 37 and 38 is such that the amount of movement is half that of the shutter 27 alone. The stroke of the operating rod 30 can be made small.
Note that the stroke of the operating rod 30 and the guide hole 37,
Oblique hole portion 37 when the amount of movement of 38 is made equal to
The inclination angle of b and 38b is 45 degrees.

On the other hand, as shown in FIG. 8, the unit device 19 that engages with the shutter opening/closing drive section 26 includes a roller or the like that protrudes outward from the side surface of the vertical frame 23 on the guide rail 23a side during the insertion/removal operation. Slider 3
4, the slider 34 slides on the upper surface of the horizontal part 31b via the slope part 31c of the movable arm 31, and is protruded at a position where the movable arm 31 can be pushed down by the weight of the unit device 19. . Therefore, the slider 34 may be simply a protrusion or a pin protruding from the side of the unit device 19. Further, as shown in FIG. 4, the unit device 19 is provided with a contact 40 that is connected to the disconnector 20 and protrudes outward from the back, and each contact 40 is attached to each of the busbars 20.
Needless to say, it is provided at a position where it can face the through hole 39.

Next, the operation of the present invention will be explained.

As shown by the imaginary line in FIG. 4, the door 13 is opened and the unit device 19 is inserted onto the shelf board 41 inside the housing 12. When the slider 34 is placed on the guide rail 23a and the unit device 19 is pushed, as shown in FIG.
The slider 34 rides on the slope portion 31c of the movable arm 31 and reaches the horizontal portion 31b. When the slider 34 and the movable arm 31 engage in this manner, the spring 33 is compressed by the weight of the unit device 19, and the entire movable arm 31 is pushed down. At this time, the operating rod 30
moves from the upper position shown in FIG. 6 to the lower position shown in FIG. 7, and by the movement of the operating rod 30,
The guide holes 37, 38 are displaced and the shutter plate 27,
28 move horizontally relative to each other, the through holes 35, 36, 39 align with each other, and the vertical generatrix 21 is exposed within the through holes 35, 36, 39, as shown in FIG.
Therefore, the contacts 40 of the unit device 19 can be pushed in until they respectively engage with the vertical generatrix 21 . On the other hand, when the unit device 19 is pulled out, as soon as the roller 34 leaves the movable arm 31, the movable arm 31 moves upward due to the force of the spring 33, and the operating rod 30 moves from the lower side as shown in FIG. Move to the upper level shown in FIG. This movement of the operating rod 30 displaces the guide holes 37 and 38, causing the shutter plates 27 and 28 to move horizontally again relative to each other, and as shown in FIG. It is something to cover.

According to the present invention described above, since the shutter plates 27 and 28 are automatically opened and closed in conjunction with the insertion/removal operation of the unit device 19, the danger of the vertical bus bar 21 being exposed when the unit device 19 is pulled out is prevented. In addition to improving safety, when the unit device 19 is inserted, the through holes 35, 36, and 39 automatically match, so the contact 40 and the bus bar 21 can come into contact, and no special operation is required. Not only is it convenient, but since the weight of the unit device 19 is configured to operate the movable arm 31 via the slider 34, the operating force required when inserting the unit device 19 is small, and the unit device 19 does not generate any rotational force in the pushing direction, the insertion operation becomes smooth, and the contact 40, the through holes 35, 36, 39, and the generatrix 21 are not misaligned. Furthermore, the shutter opening/closing drive section 26 is attached to the housing 1.
Since it is configured to operate in the height direction of 2, the dead space on the internal side can be used without increasing the depth of the housing 12, so there is no need to create a new installation space. Also, 2
Two shutter plates 27 and 28 are provided, and guide holes 37 and 38 in which the operating rod 30 engages are provided symmetrically,
Furthermore, if the openings 35, 36 are bored with a certain gap Z in between, the openings 35, 36, 39 can be operated in alignment even if the stroke of the operating rod 30 is small. This has advantages such as miniaturization.

[Brief explanation of the drawing]

1 and 2 are plan sectional views showing a conventional shutter opening/closing mechanism, FIG. 3 is a perspective view of a motor control center according to the present invention, and FIG. 4 is a diagram shown in FIG.
An X-ray sectional view, FIG. 5 is a perspective view showing the shutter opening/closing mechanism according to the present invention, FIGS. 6 and 7 are front views of the shutter plate, FIG. 8 is a perspective view of the drawer-type electric device, and FIG. 9 is a front view of the shutter opening/closing mechanism. 12...Housing, 13...Door, 14...Operation unit,
19... Unit device, 20... Disconnector, 21... Bus bar, 22... Bus bar cover, 23... Vertical frame, 24,
25...Rear frame, 26...Shutter opening/closing drive unit, 2
7, 28...Shutter plate, 29...Long hole, 30...
... Operating rod, 31 ... Movable arm, 32 ... Holder, 33 ... Spring, 34 ... Slider, 35,3
6, 39...Through hole, 37, 38...Guide hole, 4
0...Contact.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a motor control center that removably houses a unit device 19 equipped with a bus bar 21 disposed inside a housing 12 and a detachable disconnector 20, the unit device A slider 34 is provided protruding from the outer side of the housing 1 , and a movable arm 31 that engages with the slider 34 is elastically loaded with a spring 33 so that it can move up and down.
2, an operating rod 30 is provided protruding from the movable arm 31, a guide hole 37 that engages with the operating rod 30, and a through hole 35 capable of facing the generatrix 21 are provided. A shutter device for a motor control center, comprising at least one shutter plate 27. (2) The shutter plate consists of two shutter plates 27 and 28 that engage with the operating rod 30, and guide holes 37 and 38 that engage with the operating rod 30 are formed symmetrically, and a through hole is formed. 2. A shutter device for a motor control center according to claim 1, wherein the shutters 35 and 36 are movable so as to be adjacent to each other with a predetermined gap Z interposed therebetween.