JPH0723510A - Switchboard - Google Patents

Abstract

PURPOSE:To improve safety by locking movement in the horizontal direction of a shielding plate so as not to be moved as a shutter device is left as it is positioned at a closed place when a drawer unit is pulled out. CONSTITUTION:A drawer unit 1 is housed in a unit chamber 9 in a freely put-in and pulled-out manner. A shielding plate 20 is moved by the engagement of a projecting section 17 formed to the lower section of the drawer unit 1 and a slit formed to the shielding plate 20 with the putting-in and pulling-out of the drawer unit 1, and an opening section 25 shaped to a bus cover 13 is opened and closed. A lock mechanism 18 operation in response to the projecting section 17 of the drawer unit 1 is installed. When the drawer unit 1 is pulled out, a lock member 19 is brought to a projected state, and the lock mechanism 18 locks movement in the horizontal direction of the shielding plate 20. When the drawer unit is inserted, the lock member 19 is pushed down by the projecting section 17, and locking to the shielding plate 20 is released.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switchboard having a drawer unit which can be freely taken out and put in, such as a control center.

[0002]

2. Description of the Related Art Conventionally, a switchboard such as a control center is divided into a unit room by dividing a box body into shelves to form a unit room, and each unit room is equipped with various equipment such as a main circuit device and a control device. The unit is configured so that it can be taken in and out freely. FIG. 6 is a perspective view of the drawer unit viewed from the front side, and FIG. 7 is a plan view of the drawer unit viewed from the upper side. The drawer unit 1 includes a circuit breaker 2,
Various devices such as an electromagnetic contactor 3 and an overload relay 4 are housed, and the main circuit obtains power from the power supply side disconnecting section 5 mounted on the back side of the drawer unit 1 and further contacts the circuit breaker 2 with electromagnetic contact. It is connected to the load side circuit breaker 6 via the relay 3 and the overload relay 4. Further, the control disconnecting section 7 is used to connect and disconnect the control circuit such as coupling of electrical interlocks inside and outside the drawer unit 1. The withdrawal unit 1 is taken in and out of the unit room by a guide portion 8 provided at the center of the lower portion, and the load side circuit breaker 6 is connected to the withdrawal unit 1
It is configured to be automatically connected to and disconnected from the corresponding device in the box during the operation of taking in and out.

FIG. 8 is a perspective view showing a unit room of the control center. The unit room 9 is partitioned by a shelf board 10 and opened and closed by a unit door 11. A shelter plate 20 forming a shutter device is provided on the shelf plate 10. The shelter plate 20 is passed through an elliptical hole 21 provided in the shelter plate 20 by a collar 22 and a screw 23.
It is attached to No. 0 and can be moved in the left-right direction along the longitudinal direction of the elliptical hole 21.

The drawer unit 1 is placed on the shutter device, and the guide portion 8 is fitted to the guide plate 12 provided on the shelf board 10 to be taken out and put in along the guide plate 12.
A slit 24 that extends along the moving direction (front-back direction) of the drawer unit 1 and that is displaced in the left-right direction from the middle is formed in the shielding plate 20 of the shutter device. By engaging the protrusion 17 provided and moving the shield 20 in the left-right direction by inserting the drawer unit 1, the opening 15 provided in the busbar cover 13 becomes the opening 25 provided in the shield 20. The vertical busbar 14 covered by the busbar cover 13 penetrates through the openings 15 and 25 located in front in the insertion direction when the drawer unit 1 is further inserted so that the contactor 16 of the power supply side disconnector 5 is aligned. It is possible to contact with.

[0005]

In such a shutter device, when the drawer unit 1 is pulled out from the unit chamber 9, the opening 15 of the busbar cover 13 is closed to protect the charging portion. Since it is configured to move in tandem with the withdrawal of the unit 1, it can be easily operated by hand to open the opening 15 of the busbar cover 13 when the drawer unit 1 is not inserted. There is a possibility that the charging unit may be touched, and if the drawer unit 1 is forcibly inserted when the opening 15 of the busbar cover 13 is open, the shutter device may be damaged.

The present invention has been made in consideration of the above points. A first object of the present invention is to enhance safety by locking the shutter device so that it does not move in the closed position when the drawer unit is pulled out. To provide a switchboard.

A second object of the present invention is to provide a switchboard which can detect the test position of the drawer unit by utilizing the lock mechanism. A third object of the present invention is to provide a switchboard in which the unit operation test of the drawer unit can be safely performed by utilizing the contacts of the lock mechanism.

[0008]

DISCLOSURE OF THE INVENTION According to the present invention, a box chamber is divided into a plurality of stages by shelf boards to form a unit chamber, and a drawer unit having various instruments such as a main circuit device and a control instrument is put into and taken out from each unit chamber. A vertical busbar that can be freely accommodated and is connected to the drawer unit via a disconnector is arranged behind the unit chamber.The vertical busbar is covered with a busbar cover having an opening through which the disconnector is inserted, and the drawer is connected. It has a slit that engages with a protrusion provided in the lower part of the unit and moves left and right on the shelf plate that constitutes the unit chamber by moving the drawer unit in the front-back direction to open and close the opening provided in the busbar cover. In the one provided with a shutter device, corresponding to the protrusion provided at the bottom of the drawer unit,
When the drawer unit is pulled out, the lock member is in a protruding state to lock the movement of the shutter device in the left-right direction, and when the drawer unit is inserted, a lock mechanism is provided to unlock the lock member. And

Further, the present invention is characterized in that a lock mechanism is provided near the test position of the drawer unit on the connection position side and a contact interlocking with locking or unlocking by the lock member is provided. Furthermore, the present invention is characterized in that the contact of the lock mechanism is connected in parallel with the auxiliary switch of the circuit breaker provided in the control circuit.

[0010]

When the drawer unit is pulled out, the projection of the drawer unit and the slit of the shield plate engage with each other so that the shield plate moves in the direction of closing the opening of the protective cover. When the drawer unit is further drawn out, the lock member of the lock mechanism is pushed down by the protrusion of the drawer unit and then returns to the state in which the lock member projects into the slit of the shielding plate.
As a result, since the lock member projects in the slit of the shielding plate, even when the drawer unit is completely withdrawn, the horizontal movement of the shielding plate is locked.

Further, since the lock mechanism is provided near the test position of the drawer unit on the connection position side, it is possible to output to the outside by utilizing the contact signal when the lock member is pushed down by the protrusion of the drawer unit. In addition to that, it is possible to lock the lateral movement of the shielding plate.

Further, since the contact of the lock mechanism is ON when the drawer unit is in the test position, it is possible to perform a unit operation test of the drawer unit without turning on the auxiliary switch of the circuit breaker.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings by taking a control center as an example. Also in the control center according to the present embodiment, the box body is divided into a plurality of upper and lower stages by shelf plates to form a plurality of unit chambers, and drawer units are housed in the respective unit chambers so that they can be freely taken in and out. 1 is a plan view of the unit chamber as seen from above, and FIG. 2 is a cross-sectional view of the unit chamber as seen from the side. Two L's that constitute a shutter device are installed on the shelf board 10.
A shield plate 20 having a character shape is provided, and the shield plate 2
No. 0 is attached by a collar 22 and a screw 23 through an elliptical hole 21 provided in the shielding plate 20, and can be moved in the left-right direction along the longitudinal direction of the elliptical hole 21.

A slit 24 extending along the moving direction (front-back direction) of the drawer unit 1 and displacing in the left-right direction from the middle is formed on the shielding plate 20 of the shutter device. This slit 24 is a drawer unit. 1 is engaged with a protrusion 17 provided on the lower portion of the busbar 1, and the shield plate 20 is moved in the left-right direction when the drawer unit 1 is inserted.
The opening portion 15 provided in 3 is aligned with the hole 25 provided in the shielding plate 20. Then, by further inserting the drawer unit 1, the contactor 16 of the power source side disconnecting section 5
Penetrates through the openings 15 and 25 and comes into contact with the vertical busbar 14 covered by the busbar cover 13.

Here, in this embodiment, a lock mechanism 18 having the same structure as the button switch is provided, and this lock mechanism 18 has a push button 19 which is a vertically movable lock member. Push button 19
Is located in the slit 24 of the shutter device and is attached from below the shelf plate 10 so as to penetrate the shelf plate 10. The lock mechanism 18 is composed of a residual type mechanism in which, when the push button 19 is pushed down once, it returns slightly to hold the state as it is, and when it is pushed again, it returns to the original state and can be repeated. This locking mechanism 18
In the state where the drawer unit 1 is pulled out, the push button 19 is held in a raised state, whereby the shield plate 20 of the shutter device is locked so as not to move in the left-right direction.

When inserting the drawer unit 1, first, the guide portion of the drawer unit 1 and the guide plate of the shelf board 10 are engaged, and the drawer unit 1 is further moved to the right (front) in the drawing from the state of FIG. Then, as shown in FIG. 3, the protrusion 17 provided at the lower portion of the drawer unit 1 becomes the shielding plate 2.
The push button 19 is pushed down in the slit 24 of 0, and the lock of the horizontal movement of the shielding plate 20 is released. After this,
As shown in FIG. 4, the push button 19 returns slightly to the position where it protrudes from the shelf plate 10 by the passage of the drawer unit 1, but the space between the shield plate 20 and the shelf plate 10 is maintained by the collar 22. Therefore, the movement of the shielding plate 20 is not hindered. When the drawer unit 1 is moved further forward, the projection 17 at the bottom of the drawer unit 1 moves the shielding plate 20 in the left-right direction via the slit 24, and the opening 25 provided in the shielding plate 20 and the busbar cover 13 are moved. Since the positions of the openings 15 provided at the same position are matched, the contacts 16 of the power supply side disconnecting section 5 can be brought into contact with the vertical busbars 14 through these openings 15 and 25.

When the drawer unit 1 is pulled out, the contact 16
Is separated from the vertical busbar 14, and the protrusion 1 of the drawer unit 1
By the movement of 7, the shielding plate 20 moves in the direction of closing the opening 15 of the protective cover 13 via the slit 24. By further pulling out the drawer unit 1, the push button 19 shown in FIG. 3 is pushed down again by the protrusion 17 of the drawer unit 1, and by the passage of the drawer unit 1, the state shown in FIG. 4, that is, the original state before insertion is returned. Return. As a result, even when the drawer unit 1 is completely pulled out, the push button 19 projects in the slit 24 of the shielding plate 20,
It is possible to prevent the blocking plate 20 from moving in the left-right direction and keep the closed state.

Next, another embodiment of the present invention will be described. In this embodiment, the lock mechanism 18 is provided with a contact that operates in accordance with the protruding state of the push button 19, and the lock mechanism 18 is provided near the test position of the drawer unit 1 on the connection position side. In the drawer unit 1, the position holding mechanism 26 shown in FIGS.
By engaging with the engaging grooves 12a and 12b provided on the No. 2, it is held at the connecting position and the test position, respectively. The test position is a position provided for carrying out a unit operation test of the drawer unit 1, and the main circuit device is in a state of being separated from the bus bar, and is at the position shown in FIG. Therefore, the lock mechanism 18 operates in accordance with the protruding state of the push button 19, and opens when the push button 19 is pushed down when the drawer unit 1 is inserted, and the pull-out unit 1 is pulled out so that the push button 19 is in the protruding state. If a contact is provided that is closed when the contact state is reached, and the terminal 18a outputs the signal to the outside, the contact of the lock mechanism 18 is turned on when the drawer unit 1 passes immediately before the test position. It is possible to detect that 1 has come to the test position and notify the outside.

Further, by utilizing the contacts of the lock mechanism 18, it is possible to easily carry out a unit operation test of the drawer unit at the test position. That is, as shown in FIG. 5, the contact 18b of the lock mechanism 18 is connected in parallel to the auxiliary switch 27 incorporated in the breaker of the drawer unit. The auxiliary switch 27 of the circuit breaker is
It opens and closes by N, OFF operation. When pulling out the drawer unit 1 to the test position, turn off the circuit breaker, open the unit door, and pull out the drawer unit 1 to the test position.
Conventionally, the unit operation test of the drawer unit 1 was conventionally performed by turning on the circuit breaker in the OFF state and turning on the auxiliary switch. However, if the drawer unit 1 is erroneously pushed into the connection position in this state, the circuit breaker will break. It was very dangerous because it was in the ON state, but as in this embodiment, the lock mechanism 1
If the contact 18b of No. 8 is connected in parallel with the auxiliary switch 27 of the circuit breaker, the contact 18b of the lock mechanism 18 is turned on when the drawer unit 1 is pulled out to the test position, without turning on the circuit breaker. It is safe because it can supply power to the control circuit.

When the pull-out unit 1 is completely pulled out, the control circuit also disconnects from the instrument in the unit chamber by the control disconnecting section, so that the contact 18b of the lock mechanism is also turned off. In each of the above-described embodiments, the case where a button switch-shaped lock mechanism is applied has been described, but a seesaw switch-shaped lock mechanism can be similarly applied.

[0021]

As described above, the switchboard according to the present invention has a simple structure in which the lock mechanism is provided in the slit of the shielding plate constituting the shutter device, and the shutter device can be reliably locked when the drawer unit is pulled out, and the lock mechanism thereof is also provided. Can be used to detect the test position of the drawer unit,
Further, there is an effect that it is possible to safely carry out a unit operation test of the drawer unit at the test position.

[Brief description of drawings]

FIG. 1 is a plan view showing a unit room of a switchboard according to an embodiment of the present invention.

FIG. 2 is a side view showing a main part at the time of starting the insertion of the drawer unit.

FIG. 3 is a side view showing the main part when the drawer unit is in the test position.

FIG. 4 is a side view showing the main part when the drawer unit is located beyond the test position.

FIG. 5 is a circuit diagram showing another embodiment of the present invention.

FIG. 6 is a perspective view showing a drawer unit of a general switchboard.

7 is a plan view of FIG.

FIG. 8 is a perspective view showing a unit room of a general switchboard.

[Explanation of symbols]

1 is a drawer unit, 2 is a circuit breaker, 3 is an electromagnetic contactor, 4
Is an overcurrent relay, 5 is a power source side disconnector, 6 is a load side disconnector, 7 is a control disconnector, 9 is a unit room, 10 is a shelf board, 1
3 is a protective cover, 15 is an opening, 16 is a contact, 17 is a protrusion, 18 is a locking mechanism, 18b is a contact, 19 is a locking member, 20 is a shielding plate, 24 is a slit, and 25 is an opening.

Claims (3)

[Claims] 1. A unit room is constructed by partitioning the inside of the box into a plurality of shelves to form a unit room, and a drawer unit equipped with various tools such as a main circuit device and a control tool is housed in and taken out freely in each unit room, and the unit room is also provided. A vertical busbar connected to the drawer unit via a disconnector is arranged behind, and the vertical busbar is covered with a busbar cover having an opening through which the disconnector is inserted, and a projection provided at the bottom of the drawer unit. A shutter device is provided which has a slit for engaging with a portion and which is moved in the left-right direction on a shelf plate constituting the unit chamber by opening and closing the opening provided in the busbar cover by moving the drawer unit in the front-rear direction. When the drawer unit is pulled out, the locking member is in a protruding state corresponding to the protrusion provided on the lower portion of the drawer unit. The switchboard is provided with a lock mechanism that locks the movement of the input / output device in the left-right direction and that is unlocked by the lock member when the drawer unit is inserted. 2. The switchboard according to claim 1, wherein the lock mechanism is provided near the test position of the drawer unit on the side of the connection position, and the contact is provided for interlocking with locking or unlocking by the lock member. 3. The switchboard according to claim 2, wherein the contact of the lock mechanism is connected in parallel with the auxiliary switch of the circuit breaker provided in the control circuit.