JPH076646Y2 - Shutter device for switchboard - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a shutter device for a switchboard, and more particularly to an improved shutter device for a bushing in a switchboard that accommodates a drawer type device such as a circuit breaker.

B. Outline of the Invention The present invention relates to a switchboard shutter device that opens and closes an opening of a bushing, which is a disconnecting portion for connecting a drawer type device in a switchboard that accommodates the drawer type device, in conjunction with the forward / backward movement of the drawer type device. A partition having a notch at a portion facing the bushing is provided with a gap between the bushing and the end surface of the opening of the bushing, and the partition is slidable with respect to the partition on the side opposite to the bushing. By installing a shutter plate that moves up and down in conjunction with the advance and retreat of the partition wall to open and close the notch of the bulkhead, the bushing that is the high-voltage charging part can be completely isolated when the notch is closed by the shutter plate, and the end face opening of the bushing By providing a gap between the partition and the inside of the bushing, the air flow between the outside and the outside can be improved to improve the heat dissipation effect and prevent dew condensation and prevent corona generation. It can be, but is further to be able to stem the spread damage by arc accident by a double structure of the partition wall and the partition wall.

C. Conventional Technology A conventional shutter device for a switchboard is shown in FIGS.
In the ninth closed switchboard 1, a partition wall 5 is provided with a power source bus room 2 in the upper rear part, a load bus room 3 under the power switch room 3, and a circuit breaker chamber 4 in the front for accommodating a drawer type device 6 such as a circuit breaker. It is divided and provided by. The central partition wall 5 is provided with upper and lower bushings 7 and 8 which penetrate the partition wall 5 in the front-rear direction. The upper bushing 7 is connected to the power supply side, and the lower bushing 8 is connected to the load side. A draw-out type device 6 such as a circuit breaker is provided in the circuit breaker chamber 4 so as to be able to move forward and backward. As shown in FIGS.
Upper and lower fixed contacts 9 and 10 fixed inside are provided with movable contacts 11 and 12 which can be engaged and disengaged. Shutter plates 13 and 14 are provided near the openings 7a and 8a of the bushings 7 and 8 so as to be movable so as to open and close the openings 7a and 8a. These shutter plates 13 and 14 have an operating shaft 15
It is connected to the cam plate 16 via and is opened and closed in conjunction with the rotation of the cam plate 16. The cam plate 16 is pivotally mounted on the side wall of the switchboard 1 so as to be rotatable about the pin 16a, and is engageable with the drawer type device 6 so as to rotate in association with the advance / retreat of the drawer type device 6.

When the pull-out type device 6 is moved back and forth, the cam plate 16 loses its support and rotates clockwise about the pin 16a due to its own weight, and the operation shaft 15 descends and the shutter plates 13 and 14 push the bushings 7 and 8
The openings 7a and 8a are shielded. As a result, the fixed contacts 9 and 10 are isolated from the outside, and the safety of workers is ensured.

When the drawer type device 6 is carried into the circuit breaker chamber 4, the cam plate 16 is pushed by the cam plate 16 to rotate counterclockwise, the operation shaft 15 is pushed up, the shutter plates 13 and 14 are raised, and the bushing is pushed up.
When the openings 7a, 8a of 7, 8 are opened, the openings 7a, 8a
Movable contacts 11 and 12 enter a, and fixed contacts 9 and 10
Engage with.

D. Problems to be Solved by the Invention In such a shutter device of the switchboard, as shown in FIG. 10, the shutter plates 13 and 14 close only the openings 7a and 8a of the bushings 7 and 8, respectively. , Bushings 7,8
There is a danger of electric shock due to contact with the outer peripheral surface of the, and air is trapped inside the bushings 7 and 8, which creates a bad environment of high temperature and high humidity and causes dew condensation, which causes corona. On the other hand, when the shutter plates 13 and 14 are closed, a gap is set between the end faces of the openings of the bushings 7 and 8 and the shutter plates 13 and 14 to promote air convection and prevent dew condensation. The shutter plates 13 and 14
If a gap is formed between the shutter plates 13 and 14 and the end faces of the openings of the bushings 7 and 8 in the closed state due to the risk of electric shock during maintenance or inspection work, it is dangerous. .

Further, as shown in FIG. 11, when the shutter plates 13 and 14 are opened, the shutter plates 13 and 14 cover the upper parts of the bushings 7 and 8, and there is a problem that heat radiation is hindered.

Therefore, an object of the present invention is to provide a shutter device for a switchboard that solves such a problem.

E. Means for Solving the Problems The structure of the present invention for achieving such an object is to provide upper and lower bushings penetrating a partition wall in a switchboard, and to be detachable from fixed contacts in the bushing. A draw-out device having movable contacts is installed in the switchboard so that it can be moved back and forth, and a shutter plate that shields the end face opening of the bushing when the draw-out device is pulled out is provided so that it can be opened and closed in conjunction with the move-out of the draw-out device. In the shutter device of
A partition wall having notches formed at positions corresponding to the upper and lower bushings is provided with a gap between the partition wall and the end surface of the opening of the bushing protruding from the partition wall, and the shutter plate is slidably mounted on the partition wall. At the same time, it is characterized in that the notch of the partition wall is closed in conjunction with the pulling out of the drawer type device to shield the end face opening of the bushing.

F. Action When the drawer type device is carried into the switchboard, the shutter plate slides up against the bulkhead and rises to open the notch of the bulkhead,
The bushing is exposed. Then, the movable contact of the drawer type device enters into the bushing and is connected to the fixed contact.

When the drawer-type device is carried out from the switchboard, the shutter plate descends while sliding on the partition wall, and the notch portion of the partition wall is almost completely closed. Therefore, the bushing is completely isolated from the front of the switchboard by the presence of the shutter plate and the partition. Since a gap is formed between the end surface of the opening of the bushing and the partition wall and the shutter, air permeability is ensured inside and outside the bushing even when the shutter is closed, and heat storage and condensation in the bushing are prevented. It

G. Embodiment FIG. 1 to FIG. 8 show an embodiment of the present invention.
FIG. 2 is a sectional view of a switchboard that accommodates a drawer type device, FIG. 2 is an enlarged sectional view of a bushing, FIG. 3 is an exploded perspective view of a shutter, FIG. 4 is a front view of a partition wall and a shutter, and FIG. , A perspective view of the sliding fitting and the guide fitting, and FIGS. 6 to 8 show another embodiment of the shutter plate and the guide fitting. In FIGS. 1 to 3, the same components as those in FIGS. 9 to 11 are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 1, the partition wall 21 shields the bushings 7, 8 from the front of the switchboard by leaving a slight gap G forward from the end faces of the openings of the upper and lower bushings 7, 8 that penetrate the central partition wall 5. As shown in FIG. 4, rectangular notches 22 and 23 are provided at the portions facing the bushings 7 and 8, respectively. The operating shaft 24 is vertically movably supported by guide metal fittings 29 fixed to both sides of the notches 22 and 23 of the partition wall 21, and the lower end thereof is supported by a cam plate 28 via a connecting metal fitting 26 and a arm 27. It is pivotally attached and moves up and down in conjunction with the rotation of the cam plate 28. The cam plate 28 is pivotally attached to the side wall of the switchboard 1 as in the conventional case, and rotates around the pin 28a in conjunction with the loading / unloading operation of the drawer type device 6.

The shutter plate 25 has a rectangular shape so that the upper and lower cutouts 22 and 23 of the partition wall 21 can be closed. One side of the upper shutter plate 25 is fixed to the one operation shaft 24 via the fixing metal fitting 30, and the other side is engaged with the other operation shaft 24 via the sliding metal fitting 31 so as to be able to move up and down relatively. . The lower shutter plate 25 has one side engaged with one operation shaft 24 via a sliding metal fitting 31 so as to be able to move up and down relatively, and the other side is fixed to the other operation shaft 24 via a fixing metal fitting 30. .

Here, the guide fitting 29, the fixing fitting 30, the sliding fitting 31, and the operating shaft
The shutter plate 25, which is attached to the partition wall 21 so as to be able to move up and down through the and 24, is mounted so as to slide on the partition wall 21. In this way, it is made slidable that when the pull-out type device 6 is carried out and the notches 22 and 23 of the partition wall 21 are closed by the shutter plate 25, the bushing 7 is contacted with the bushing 7 in some form from the front of the switchboard. This is to ensure safety so that there is nothing to do. Further, since the gap G is provided between the end faces of the openings of the bushings 7 and 8 and the partition wall 21 as described above, even if the space surrounded by the partition wall 5 and the partition wall 21 is closed as described above, It is possible to secure the air permeability in the 7 and 8.

In addition, these fixing bracket 30, sliding bracket 31, and guide bracket 2
9 can be parts having the same structure as shown in FIG. Further, as shown in FIGS. 6 and 7, the shutter plate 25 is curved so that its side edge is wound around the outer periphery of the operation shaft 24 to form a curved piece 25a, which is formed by the operation shaft 24.
Fixing bracket 30
Alternatively, the mounting of the sliding fitting 31 can be omitted. In FIG. 7, reference numeral 32 is a handle for manually pulling up the shutter plate 25. Further, as shown in FIGS. 8 (a) and 8 (b), a part of the side edges of the notches 22 and 23 of the partition wall 21 is curved so that the guide projection 33 on which the operation shaft 24 can slide is formed into the partition wall. It is possible to omit the mounting of the guide fitting 29 formed integrally with the 21.

Next, the operation of the above embodiment will be described. When the drawer type device is carried into the switchboard 1, the cam plate 28 rotates counterclockwise around the pin 28a in FIGS.
The left and right operation shafts 24, 24 are elevated via 26. Along with this, the shutter plates 25, 25 that have closed the notches 22 and 23 of the partition wall 21 slide up on the partition wall 21 and rise to rise to the notches 22 and 23.
Open up. As a result, the bushings 7 and 8 are exposed, and the movable contacts 11 and 12 of the drawer type device 6 enter into the bushings 7 and 8 and are connected to the fixed contacts 9 and 10. When the contacts are connected, the heat generated in the bushings 7 and 8 is radiated to the surroundings and particularly upward without any obstacle.

When the pull-out type device 6 is carried out from the switchboard 1, the movable contacts 11 and 12 are separated from the bushings 7 and 8 and the cam plate 28 is removed.
Is rotated clockwise, and the operating shafts 24, 24 are lowered via the connecting metal fittings 26 and the braces 27, so that the shutter plates 25, 25 slide down on the partition wall 21 and the cutouts 22, 23 To close. When the notches 22 and 23 are closed, the shutter plate 25
With the partition wall 21, the bushings 7 and 8 are substantially completely shielded from the front side of the switchboard. Therefore, in this state, the bushings 7 and 8 cannot be approached from the front side. Since the gap G is formed between the opening end surface of the bushing 7, 8 and the shutter plate 25, 25 even when the shutter is closed, the air in the bushing 7, 8 flows to the outside of the bushing 7, 8. Convection is possible and condensation that induces corona discharge is prevented. If it is necessary to inspect the bushings 7 and 8 when closing the shutters, manually lift the operating shafts 24 and 24 one by one, and either the upper or lower shutter plate 25
Push up to expose bushing 7 (or 8). As shown in FIG. 7, the shutter plate 25 is previously provided with a handle 32.
By providing, it is possible to easily push up. In this case, since the other bushing 8 (or 7) is shielded, the inspection work can be safely carried out.

H. Effect of the Invention In the present invention, a partition having a notch at a portion facing the bushing is provided with a gap between the partition and the end surface of the opening of the bushing, and the partition is mounted on the side opposite to the bushing with respect to the partition. Since a shutter plate that is movable and that moves up and down in conjunction with the withdrawal of the drawer type device is installed, the bushing can be completely isolated from the front of the switchboard in cooperation with the partition wall by closing the shutter plate, and there is no risk of contact. Can be prevented. Further, since the gap is provided between the bushing and the partition wall and the shutter, the convection of air in the bushing is promoted, dew condensation that causes corona generation is prevented, and the heat dissipation effect is improved. Further, the double structure of the partition wall and the partition wall strengthens the arc resistant structure of the switchboard, and can reliably prevent the spread damage in the event of an accident.

[Brief description of drawings]

1 to 8 show an embodiment of the present invention.
FIG. 2 is a sectional view of a switchboard that accommodates a drawer type device, FIG. 2 is an enlarged sectional view of a bushing, FIG. 3 is an exploded perspective view of a shutter, FIG. 4 is a front view of a partition wall and a shutter, and FIG. 6 and 7 are plan views showing another embodiment of the shutter plate, and FIGS. 8 (a) and 8 (b) are other embodiments of the guide fitting. Front view and its II arrow view, FIG. 9 is a cross-sectional view of a conventional switchboard that accommodates a drawer type device, FIG. 10 is a cross-sectional view of a conventional bushing in a closed state by a shutter plate,
FIG. 11 is a sectional view of the bushing similarly in the state where the shutter plate is opened. 1 ... Switchboard, 6 ... Drawer type device, 7,8 ... Bushing, 21 ... Bulkhead, 22,23 ... Notch, 25 ... Shutter plate.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-61-207107 (JP, A) JP-A-57-138805 (JP, A) Actually opened 55-79606 (JP, U) Actually opened 61- 123608 (JP, U) Actual opening Sho 57-130507 (JP, U) Actual opening Sho 58-28506 (JP, U) Actual opening Sho 60-59714 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. An upper and lower bushings penetrating a partition wall are provided in a switchboard, and a drawer type device having movable contacts that can be engaged with and disengaged from fixed contacts in the bushing is provided in the switchboard so as to be able to advance and retreat. In the shutter device of the switchboard, which is provided with a shutter plate that shields the end face opening of the bushing when the drawing equipment is pulled out, and that can be opened and closed in conjunction with the advance and retreat of the drawn equipment, cutouts are provided at the positions corresponding to the upper and lower bushings, respectively. The formed partition wall is provided with a gap between it and the end face of the opening of the bushing protruding from the partition wall, and the shutter plate is slidably mounted on the partition wall. A shutter device for a switchboard, characterized in that the notch is closed to shield the end face opening of the bushing.