JP5538651B2 - Shutter device for switchboard - Google Patents

Description

  The present invention relates to a shutter device that covers a disconnecting portion of a switchgear such as a drawer type circuit breaker housed in a switchboard.

The switchgear housed in the closed switchboard, for example, the circuit breaker, is pushed and pulled out from the front of the storage room so that it can be easily maintained and inspected. In many cases, it is configured to be a drawer type that can be brought into and out of contact.
In a switchboard equipped with such a drawer type circuit breaker, when the circuit breaker is pulled out, a shutter plate that covers the front surface of the disconnection part is provided so that the charging part of the disconnection part on the back of the storage chamber is not exposed to the outside. In conjunction with the operation of pulling out or pushing in the circuit breaker, the disconnecting portion is closed when pulled out and opened when pushed.

  As a conventional switchboard shutter device, for example, a drawer type switch housed in the box body of the switchboard and movable in the front-rear direction by wheels can be connected to or disconnected from the main circuit disconnection portion protruding from the rear surface thereof. It is arranged and slides vertically on the front surface of the main circuit disconnection part, and is provided with a shutter that is shielded when disconnected and opened when connected, and moves up and down with the shutter attached. A shutter holding plate, and a shutter lever having one end pivotally supported at the lower end of the shutter holding plate and the other end pivotally supported on the box body. A shutter drive unit that contacts the rear wheel is provided. When the switch is pushed in, the shutter drive unit is pushed by the rear wheel and rides along the arc of the rear wheel so that the shutter is moved upward along with the shutter holding plate. Driven to Is, when pulling the switch, technology shutter is configured to descend in the reverse operation has been disclosed (e.g., see Patent Document 1).

JP 2000-13940 (5th page, Fig. 1-3)

In a conventional switchboard shutter device such as the cited document 1, one end of a shutter lever is pivotally supported by a support member disposed outside the wheel of a switch in the box, and a shutter holding plate is provided at the other end of the shutter lever. Since these are connected, there has been a problem that the width of the box for storing them becomes large.
In addition, when a worker enters the box and performs an inspection operation after the switch is pulled out of the panel, a mechanism unit for driving a shutter such as a support member, a shutter lever, and a shutter drive unit is provided in the box. Therefore, there is a problem that an operator may accidentally operate the shutter in the opening direction and come into contact with a main circuit charging unit disposed in the back of the shutter.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a shutter device for a switchboard having excellent safety by reducing the size of a box body that accommodates a switch.

A shutter device for a switchboard according to the present invention includes a fixed frame that has wheels and has a drawer-type switch that is movable in the front-rear direction between a drawer position and a connection position. A main circuit disconnection part that can be connected to and separated from the upper and lower terminals derived from the rear part of the device, and a shutter plate that is in front of the main circuit disconnection part and opens or closes the energization part of the main circuit disconnection part by vertical movement. In the shutter device of the distribution board, a vertically long shutter support frame that moves up and down while supporting the left and right ends of the shutter plate, and a long guide groove in the front-rear direction provided in the vicinity of the left and right side walls in the fixed frame are formed. The guide plate, one end side is connected to a moving pin movable along the guide groove, the other end side is pivotally supported by the middle portion of the shutter support frame, and the lever is protruded from one end side of the lever. Switch and rear of switch In the state where the rear part of the switch is in contact with the contact part, the shutter plate is opened by the insertion operation from the drawing position to the connection position, and the drawing operation from the connection position to the drawing position is performed. The shutter plate is configured to close.

  According to the shutter device for the switchboard of the present invention, the shutter support frame that moves up and down while supporting the shutter plate, and the guide plate that is provided near the lower portions of the left and right side walls in the fixed frame and has a long guide groove in the front-rear direction. A lever having one end connected to a movable pin movable along the guide groove, and the other end pivotally supported on the middle portion of the shutter support frame, and a switch protruding from one end of the lever. The shutter plate opens or closes in conjunction with the movement from the pull-out position to the connection position in a state where the rear end portion of the switch is in contact with the contact portion. Therefore, the structure of the drive mechanism that moves the shutter plate up and down is simplified, and the shutter device of the switchboard that can reduce the width of the fixed frame can be obtained.

It is side surface sectional drawing which shows the shutter apparatus of the switchboard by Embodiment 1 of this invention. It is a plane sectional view of the important section of FIG. It is a side view of the principal part of FIG. It is front sectional drawing of the principal part of FIG. It is explanatory drawing of the state which has a switch in a drawer position in the shutter apparatus of the switchboard by Embodiment 1 of this invention. It is explanatory drawing of the state which has a switch in a disconnection position in the shutter device of the switchboard by Embodiment 1 of this invention. It is explanatory drawing of the state which has a switch in a connection position in the shutter apparatus of the switchboard by Embodiment 1 of this invention.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view of the shutter device of the switchboard according to the first embodiment, and shows a state in which a drawer-type switch is placed on a fixed frame and the shutter is closed. 2 to 4 are enlarged views of the main part of FIG.

In FIG. 1, a drawer-type switch 2 is placed in a fixed frame 1 that is arranged and fixed in a switch chamber in a casing (not shown) of a switchboard. A bus room or a cable room is adjacent to the rear of the fixed frame 1.
The switch 2 is mounted on a carriage having wheels 2a, and is movable in the front-rear direction. The upper terminal 3a and the lower terminal 3b are led out from the back side of the main body, and each tip is in contact with each other. Child 4 is attached.
On the other hand, the rear wall 1a on the back side of the fixed frame 1 is provided with a three-phase main circuit disconnecting portion 5 divided into upper and lower stages at positions facing the upper terminal 3a and the lower terminal 3b of the switch 2. Yes. One phase portion of the main circuit disconnecting portion 5 has a cylindrical insulating cylinder 5a and a central conductor 5b which is attached through a partition wall inside the cylindrical insulating cylinder 5a and serves as an energizing portion. In the figure, the insulating cylinder 5a is shown in which the upper three phases and the lower three phases are all formed integrally, but each phase may be individually provided.

The central conductor 5b of the main circuit disconnecting part 5 protruding to the inside of the fixed frame 1 is an upper terminal 3 of the switch 2.
It fits with the contact 4 of a and the lower terminal 3b, and can contact / separate. A main circuit conductor (not shown) such as a main bus or a cable is connected to an end portion protruding outward from the rear wall 1a of the center conductor 5b. Thus, by moving the drawer-type switch 2 in the front-rear direction, the switch 2 can be connected to or disconnected from the main circuit conductor behind the central circuit 5b of the main circuit disconnecting portion 5. .

Next, the shutter and its driving mechanism will be described.
FIG. 2 is a view as seen from the upper surface of FIG. 1, and is a plan sectional view of the vicinity of the corner portion on the left back side when the fixed frame 1 is seen from the front side. FIG. 3 is a side view of the lower side of the portion corresponding to FIG. 2 as viewed from the inside of the fixed frame 1. 4 is a front sectional view as seen in the direction of arrow IV in FIG. A description will be given with reference to FIGS.
Two shutter plates 6 each having a horizontally long rectangular shape and made of an insulating member are provided so as to close the opening of the insulating cylinder 5 a immediately in front of the insulating cylinder 5 a of the main circuit disconnecting portion 5. As shown in FIG. 2, the left and right ends of the shutter plate 6 are fixed to a shutter holding frame 7 that is U-shaped in cross section and is long in the vertical direction. The shutter holding frame 7 has two elongated holes 7a formed vertically on the side as viewed in the direction of FIG. 1, and the elongated holes 7a are erected on the side wall 1b of the fixed frame 1. The guide pin 8 is slidably engaged.

As shown in FIGS. 3 and 4, wheel guides 9 are formed on the left and right lower sides inside the fixed frame 1 by being folded into a U-shaped cross section so as to surround the wheel 2 a of the drawer-type switch 2. However, the U-shaped openings are arranged facing each other in the front-rear direction of the fixed frame 1. The wheel guide 9 serves to prevent the wheels 2a from being lifted.
The end portion of the horizontal surface on the upper surface of the wheel guide 9 is further bent vertically upward to make this portion a guide plate 10. The guide plate 10 is formed with a guide groove 11 that penetrates in the thickness direction and is elongated in the front-rear direction. Details of the guide groove 11 will be described later.
A movable pin 12 that slides along the guide groove 11 and is movable is engaged with the guide groove 11. As shown in FIG. 4, the moving pin 12 has a stepped rod shape with a large diameter portion and a small diameter portion, and the small diameter portion is inserted into the guide groove 11 from the inside of the fixed frame 1, and the small diameter portion side will be described later. Lever 13 is joined. Moreover, the large diameter part which protruded to the switch 2 side becomes the contact part 12a with which the rear part of the switch 2 contacts.

A lever 13 having a U-shaped cross section is disposed outside the guide plate 10, that is, on the side facing the side wall 1 b of the fixed frame 1, and one end of the lever 13 is connected to the small diameter portion of the moving pin 12. doing. Therefore, one end side of the lever 13 can move in the front-rear direction along the guide groove 11 and can turn around the moving pin 12 as a fulcrum.
As shown in FIG. 3, the other end of the lever 13 is pivotally supported by a pin 14 provided at an intermediate portion of the shutter holding frame 7.

Next, the operation of the shutter unit configured as described above will be described.
FIG. 5 shows a state in which the switch 2 is disconnected from the main circuit disconnecting portion 5 and is in the drawing position. FIG. 6 shows the upper and lower terminals of the switch 2 while the shutter plate 6 is open during the operation. FIG. 7 is a diagram showing a state in which the contact 4 of 3a and 3b is in a disconnection position where it is not connected to the central conductor 5b of the main circuit disconnection part 5, and FIG. In either case, (a) is a front view (switch not shown) of the inside of the fixed frame 1 as viewed from the front side, and (b) is a side sectional view.

Maintenance switch 2 at the inspection or the like is drawn on the front side of the fixed frame 1 is disconnected from the main circuit disconnector 5, when Ru near such extracted position shown in FIG. 5, the shutter plate 6 is lowered along with the shutter holding frame 7 Then, the front surface of the insulating cylinder 5a of the main circuit disconnecting portion 5 is closed so that the central conductor 5b as the energizing portion is not exposed. The lower side of the lever 13 slides to the front end of the guide groove 11 and is at the position shown in the figure.
When the switch 2 is brought into the connected state from the state as shown in FIG. 5, the switch 2 is pushed rearward along the wheel guide 9. Thereby, first, the rear part of the switch 2 is brought into contact with and engaged with the contact part 12a formed integrally with the moving pin 12, and the position of the switch 2 entering the connection operation is detected. In this state, when pushing further backward (backward), the lower part of the lever 13 moves rearward along the guide groove 11 by pushing the contact part 12 a at the rear part of the switch 2. Since the upper side of the lever 13 is rotatably connected to the shutter holding frame 7 by the pin 14, the shutter plate 6 rises together with the shutter holding frame 7 in conjunction therewith.

  The insertion operation proceeds, the abutting portion 12a is pushed, the lower end portion of the lever 13 moves rearward along the straight portion of the guide groove 11, and the upper end on the back side of the switch 2 and the distal end portions of the lower terminals 3a, 3b When the contactor 4 passes through the position of the opening / closing surface of the shutter plate 6, as shown in FIG. 6, the shutter plate 6 substantially rises to the open position, and as shown in FIG. The circuit disconnection part 5 is exposed. That is, the length and fulcrum position of the lever 13 and the dimensions and arrangement of the guide groove 11 are determined so as to have such a relationship.

Further, when the switch 2 is pushed to the connection position, the contact 4 of the upper and lower terminals of the switch 2 and the center conductor 5b of the main circuit disconnecting portion 5 are fitted and connected as shown in FIG.
Since the shutter plate 6 is already in the open position at the previous position shown in FIG. 6, the guide groove 11 provided in the guide plate 10 is prevented from further rising while the shutter plate 6 is advanced to the connection position shown in FIG. The shape is devised.
That is, in the position of FIG. 6B, with the position of the pin 14 on the upper side of the lever 13 fixed as a fulcrum, an arc-shaped locus drawn by the moving pin 12 when the lower side of the lever 13 is moved backward. A circular arc-shaped groove is formed so as to extend along the horizontal axis and smoothly connected to the horizontal groove to form one guide groove 11 (see also FIG. 3). As a result, from the position of FIG. 6B to the position of FIG. 7B, the shutter holding frame 7 is kept almost stationary, the shutter plate 6 hardly moves, and can be kept open. ing.

When the switch 2 is disconnected from the main circuit disconnecting part 5 for maintenance inspection or the like, the operation is the reverse of the above, and when the switch 2 is pulled out to the pulling position, the shutter plate 6 is lowered to the closing position and closed.
The driving force in the direction of closing the shutter plate 6 can be obtained by, for example, providing a spring that urges the lower end side (moving pin side) of the lever 13 forward in addition to the dead weight of the shutter plate 6 and the shutter holding frame 7. Good.

In the above description, the shutter holding frame 7 and the lever 13 have a U-shaped cross section, but may have an L-shaped cross section, for example.
Further, the guide plate 10 is formed integrally with the wheel guide 9 by bending a part of the wheel guide 9, but may be a separate member. In any case, it is possible to suppress an increase in the dimension in the width direction of the fixed frame 1 by using the space above the wheel 2a.
Furthermore, although the lever 13 is disposed on the outer side of the guide plate 10, that is, on the side facing the side wall 1 b of the guide plate 10, the lever 13 may be disposed on the inner side of the guide plate 10. However, if arranged on the outer side, only the abutment portion 12a protrudes inward in the shutter drive portions on both sides in the fixed frame 1, so that the operator pulls the switch 2 to the fixed frame 1. Since there are few parts that are accidentally touched when performing inspections and the like after entering, the shutter that shields the charging unit does not open carelessly, and an electric shock can be prevented.

As described above, according to the shutter device of the switch according to the first embodiment, the fixed frame that accommodates the drawer-type switch that has wheels and is movable in the front-rear direction between the pull-out position and the connection position, A main circuit disconnecting portion that is provided on the rear wall of the frame and can be brought into contact with and separated from the upper and lower terminals led out from the rear portion of the switch, and an energizing portion of the main circuit disconnecting portion in front of the main circuit disconnecting portion by vertical movement In a shutter device of a switchboard having a shutter plate that opens or closes, a longitudinal shutter support frame that moves up and down while supporting the left and right ends of the shutter plate, and a front and rear provided near the lower portions of the left and right side walls in the fixed frame A guide plate formed with a long guide groove in the direction, a lever having one end connected to a moving pin movable along the guide groove and the other end pivotally supported by the middle portion of the shutter support frame; Projected on one end of the lever And the rear part of the switch is in contact with the contact part, and the shutter plate is opened by the insertion operation from the drawer position to the connection position. Since the shutter plate is closed by the pulling operation to the pulling position, the configuration of the drive mechanism for moving the shutter plate up and down becomes simple, and the shutter of the switchboard that can reduce the width of the fixed frame A device can be obtained.

  In addition, the guide plates are provided on the both sides of the lower portion of the fixed frame and on the upper portion of the wheel guide that guides the traveling of the wheel of the switch, and the lever is disposed on the side of the guide plate facing the side wall. The width dimension of the fixed frame can be effectively reduced, and since there are few portions that erroneously touch the shutter drive unit, the shutter that shields the charging unit is not opened carelessly, and an electric shock can be prevented.

  In addition, since the abutting portion with which the rear portion of the switch abuts is the one end portion side of the moving pin that protrudes to the switch side through the guide groove of the guide plate, the number of parts is reduced and the shutter is simple in configuration Equipment can be provided.

Further, the guide groove is formed in a horizontal direction from the front side to the rear side and is bent in a circular arc shape from the middle to the lower side. In the process in which the switch moves between the drawing position and the connection position. In the movement section from the position of the opening / closing surface of the shutter plate to the connection position, the shutter plate is configured to remain almost open and remain stationary in the moving section from the position of the opening / closing surface of the shutter plate to the connection position. move-out a small Kude, it is possible to reduce the size of the fixed frame.

DESCRIPTION OF SYMBOLS 1 Fixed frame 1a Rear wall 1b Side wall 2 Switch 2a Wheel 3a Upper terminal 3b Lower terminal 4 Contact 5 Main circuit disconnection part 5a Insulating cylinder 5b Center conductor 6 Shutter plate 7 Shutter holding frame 7a Long hole 8 Guide pin 9 Wheel guide 10 Guide plate 11 Guide groove 12 Moving pin 12a Contact part 13 Lever 14 Pin.

Claims (4)

A fixed frame in which a drawer-type switch that has wheels and is movable in the front-rear direction between a pull-out position and a connection position is housed; an upper portion that is provided on the rear wall of the fixed frame and is led out from the rear part of the switch; In a shutter device of a switchboard comprising: a main circuit disconnection portion that can be connected to and separated from a lower terminal; and a shutter plate that is in front of the main circuit disconnection portion and opens or closes an energization portion of the main circuit disconnection portion by vertical movement ,
A vertically long shutter support frame that moves up and down while supporting the left and right ends of the shutter plate;
A guide plate provided in the vicinity of the left and right side wall lower portions in the fixed frame and having a long guide groove in the front-rear direction;
A lever having one end connected to a movable pin movable along the guide groove and the other end pivotally supported by an intermediate portion of the shutter support frame;
A contact portion protruding from the one end side of the lever and contacting the rear portion of the switch;
In a state where the rear part of the switch is in contact with the contact part, the shutter plate is opened by the insertion operation from the extraction position to the connection position, and the shutter is extracted by the extraction operation from the connection position to the extraction position. A switchboard shutter device, characterized in that the plate is configured to close. In the shutter device of the switchboard according to claim 1,
The guide plate is provided on an upper portion of a wheel guide on both sides of the lower portion of the fixed frame for guiding the traveling of the wheel of the switch, and the lever is provided on a side of the guide plate facing the side wall. A shutter device for a switchboard, wherein the shutter device is arranged. In the shutter device of the switchboard according to claim 1 or 2,
The switchboard shutter device according to claim 1, wherein the contact portion is on one end side of the moving pin that protrudes toward the switch through the guide groove of the guide plate. In the shutter apparatus of the switchboard of any one of Claims 1-3,
The guide groove is horizontally formed from the front side to the back side and is bent in an arc from the middle to the lower side,
When the switch moves between the pull-out position and the connection position, the tip of the upper and lower terminals of the switch is in the movement section from the vicinity of the position of the opening / closing surface of the shutter plate to the connection position. A shutter device for a switchboard, wherein the shutter plate is configured to be substantially stationary while maintaining an open state.

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