JPH0367428A - Interlock mechanism for opening/closing device - Google Patents

Abstract

PURPOSE:To obtain a small-sized interlock mechanism with a few number of components of on opening/closing device by providing a breaker operating means, an unlocking member driving means, a switching means, a locking means, and a contact means. CONSTITUTION:A contact operating plate 1 is rotated from the position indicating the neutral position of a breaker to an arrow A, and the projection 1b of the plate 1 rotates a ground indicating plate 4 in a direction B. A connecting pin 8 of links 7 and 8 is pressed down in a direction C. The pin 7 sets an interlocking plate 17 to a position (a). The pin 8 of the interlocking plate 17 rotates a switching preventing lever 3 in a direction D. The left end of the lever 3 is coupled with a switching plate 2, and the plate 2 is prevented from being moved vertically to the paper face. An interlocking bar 9 rotates an interlock laver 16 in a direction E, and a pin 10 is moved by a guide 11 in a direction E. The bar 9 is excited by a spring and can open a door 12 in a direction G. Unlocking is performed only when the contact operating plate 1 is rotated to the ground side, the rotation of the operating plate 1 to the exciting side is prohibited, and the preset safety function is satisfied.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a switchgear provided for safely opening and closing a door during maintenance and inspection of a switchgear that opens and closes an electric circuit. Regarding the interlock mechanism. It is something.

[Prior Art] A door is provided in the casing of a switchgear in order to perform maintenance and inspection of the main circuit disposed inside the casing. Therefore, in order to open and close the door safely, in addition to a switch that connects and disconnects the main circuit and the electric circuit, the main circuit that has been disconnected from the electric circuit is connected to one ground side for charging. A disconnector is provided to release the Therefore, it is necessary to provide an interlock mechanism having the following relationship between the disconnector and the door.

(1) When the switch is cut off, the door cannot be opened unless the switch is on the ground side.

(2) The disconnector cannot be switched to the energized side when the door is open.

In order to achieve the above functions, the conventional interlock mechanism includes a first interlock mechanism that unlocks the door only when the main circuit is grounded, in conjunction with the operating mechanism of the disconnect switch. and a second interlock mechanism that prohibits switching of the disconnector to the energized side when the door is open.

[Problems to be Solved by the Invention] As described above, the interlock mechanism of the conventional switchgear requires two systems of interlock mechanisms to be provided between the disconnect switch and the door. Since there is a certain distance between the parts, a large space is required inside the device to arrange these mechanisms.

The present invention has been made in order to solve the above-mentioned problems, and it satisfies predetermined safety functions with an interlock mechanism of a simple structure, reduces the number of parts, and provides a small and inexpensive switchgear. The purpose is to obtain an interlock mechanism.

[Means for Solving the Problems] An interlock mechanism for a switchgear according to the present invention comprises: an operating means for operating a disconnector for switching a main circuit that has been cut off from an electrical circuit to a grounding side or an energized side; and the operating means. a transmission means that drives an unlocking member near the door by a switching operation; and a switch that operates in conjunction with the transmission means to enable switching of the operating means to the energized side only when the door is locked. a locking means for locking or unlocking a door in conjunction with the operation of the transmission means; and a contact means for abutting against the transmission means and regulating the operation of the door of the locking means when the door is in an open state. It is intended to do 6 itl.

[Operation 1] When the operation means, for example, the contact operation plate is rotated, the operation is transmitted to the locking means of the door section via the transmission means. However, the locking means is unlocked only when the contact operation plate is rotated toward the ground side. In addition, when the door is open, the contact means
Rotation of the contact operation plate toward the energized side is prohibited. The switching means interlocked with the transmission means allows the contact operation plate to rotate toward the energized side only when the door is in the open state.

[Embodiment] Hereinafter, one embodiment of the interlock mechanism of the opening/closing device of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing the main parts of the interlock mechanism of the opening/closing device of the present invention, and FIG.
1, 3 and 4 are schematic diagrams showing the operation of the interlock mechanism shown in FIG. 1, respectively. The contact operation plate l, which is the operation means, operates the contacts of a disconnector (not shown) by its rotation.The position of the contact operation plate l shown in FIG. 1 is such that the contact of the disconnector connects to the main circuit. Indicates that it is connected to the ground side. The position of the contact operating plate 1 in FIG. 2 shows that the contact of the disconnector is in the neutral position, and FIG. 3 shows that it is in the energized position. FIG. 1 shows a grounding position where the contact operating plate l is rotated from the neutral position in the direction of arrow "A".

In FIG. 1, the protrusion 1b of the contact operating plate 1 engages with the grounding indicator plate 4 to rotate the grounding indicator plate 4 clockwise (in the direction of the arrow "i") around the shaft portion 4a. This ground marking plate 4 indicates the position of the contact point of the disconnector to the outside of the housing through the window of the housing. This engagement causes the first link 5
The first pin 7 at the joint between the second link 6 and the second link 6 is pushed down (in the direction of the arrow "U"). This first pin 7 engages with the lower surface of the first sliding hole 7a provided in the interlocking plate 17 and has a shape elongated in the vertical direction, so that the interlocking plate 17
is pushed down. The position of this first pin 7 shown in FIG. 1 is defined as position a. A second pin 8 is attached to the interlocking plate 17.
The switching prevention lever 3, which has a second slide hole 8a in the shape of an elongated left and right that engages with the second pin 8, rotates clockwise around its shaft portion 3a (see the arrow "E"). ” direction). For this reason, the switching prevention lever 3
Since the left end of the switch plate 2 is engaged with a part of the switching plate 2, the switching plate 2 cannot be moved toward the front in the direction perpendicular to the plane of the paper in FIG. This switching plate 2 is used when switching the contact operating plate l from the neutral position to the energized position. By pulling the switching plate 2 toward the front in FIG. 1, the contact operating plate l changes to the energized side. It has a structure that allows it to rotate. In this embodiment, the switching prevention lever 3 and the switching plate 2 are the switching means. Further, the vertical movement of the interlocking plate 17 is transmitted by the connecting rod 9 to a locking means provided on the door.

Next, the structure of the locking means will be explained. In FIG. 1, since the interlock lever 16 connected to the connecting rod 9 is rotated counterclockwise (in the direction of the arrow "O") around the shaft portion 16a, the interlock pin 10 is It is guided by the lock bin guide 11 and is moving to the left (in the direction of the arrow "ka"). The connecting rod 9 is a biasing means;
For example, it is always urged upward by a tension spring 14. As described above, in the state shown in FIG. 1, the interlock bin 10 is not pushed into the hole 12a provided at 1812, and the door 12 is in a state where it can be opened in the direction of the arrow "<".

Next, a case will be described in which the contact operation plate l shown in FIG. 2 is in the neutral position. In this state, the protrusion 1b of the contact operation plate l
is not engaged with the ground contact indicator plate 4, so the ground contact indicator plate 4 is rotated in the direction of arrow "A" by the pressing force of the tension spring 14 and returned to the position shown in FIG. therefore,
When the ground marking plate 4 is at the return position, the first pin 7 is at position b above position a. Further, the interlocking plate 17 is connected to the tension spring 1
4 has been moved upward (in the direction of the arrow "tsu"),
The switching prevention lever 3, which is engaged with the second protrusion 8 of the interlocking plate 17, rotates counterclockwise around the shaft portion 3a in the direction of the arrow "work">
It is rotating. Therefore, the left end portion of the switching prevention lever 3 does not engage with the switching plate 2. On the other hand, this interlocking plate 17
The interlock bin lO of the locking means connected to is projected to the right (in the direction of the arrow "force") via the connecting rod 9 and the interlock lever 16. Therefore, the interlock bin IO is pushed into the hole 12a of 512, and the door becomes locked.

With the door section shown in FIG. 2 above locked, push the manual handle into the shaft section 1a of the contact operation plate l from outside the casing, and place the contact operation plate l in the energized position shown in FIG. 3. Rotate (in the direction of arrow “A”).

At this time, at the same time, the contact operation plate 1 is rotated while moving the switching plate 2 toward the front side. As described above, by simultaneously operating the contact operation plate 1 and the switching plate 2, the contact of the disconnector becomes the energized side, and the switch becomes ready to close.

Next, a case will be described in which the door 12 is opened and the contact operation plate l is rotated to the neutral position in a state where the contact operation plate l shown in FIG. 1 is in the ground position.

This state is shown in FIG. In the door portion, a compression spring 13 and a stopper 15, which are contact means, are provided on the side of the casing facing n12. One end of the compression spring 13 is fixed to the casing of the door section, and the other end is fixed to the stopper 15.

Therefore, the stopper 15 is always pressed downward (in the direction of the arrow "X") in FIG. 4. This stopper 1
5 is penetrated by a sliding rod 15a fixed to the housing so that it can move only in the vertical direction. Further, the stopper 15 is configured to be prohibited from moving downward (in the direction of the arrow "K") at a position facing the interlock bin IO. Therefore, in the state shown in FIG.
” When opened in the direction, the stopper 15 locks the interlock pin 1.
Jump out to a position facing G. In this state, when the contact operation plate 1 is rotated to the neutral position (in the direction of arrow "A"), the grounding indicator plate 4 returns to the position shown in FIG. 2. This state is shown in FIG. At this time, the first pin 7 moves to position b, but the tip of the interlock pin 10 contacts the stopper 15 and is prevented from protruding. For this reason, the interlocking plate 17 is prohibited from moving upward (in the direction of the arrow "tsu"), and the first pin 7 is inserted into the first sliding hole 7a of the interlocking plate +7.
It will be in a state where it is engaged with the upper side of. Therefore, the interlocking plate 17
The left end of the switching prevention lever 3 that engages with the second pin 8 engages with the switching plate 2. Therefore, movement of the switching plate 2 is prohibited, and the contact operation plate 1 cannot be rotated to the energized position. Furthermore, when the door is closed in the direction of the arrow "R" in this state (FIG. 4), the interlock bin 10 that was in contact with the stopper 15 is inserted into the hole 12a of I#12.

Therefore, the door 12 becomes locked, the interlocking plate 17 moves upward (in the direction of the arrow "T"), and the switching prevention lever 3 and the switching plate 2 no longer engage with each other. Therefore, the switching plate 2 can be moved, and the contact operating plate l can be rotated to the energized position.

[Effects of the Invention] As described above, according to the interlock mechanism of the opening/closing device of the present invention, the predetermined safety function can be satisfied with a simple interlock mechanism that connects the operating section and the door section of the disconnector. Therefore, it is possible to obtain a small and inexpensive interlock mechanism for a switchgear with a small number of parts.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the main parts of the interlock mechanism of the opening/closing device of the present invention, and FIGS.
FIG. 3 is a schematic diagram showing the operation of the interlock mechanism shown in the figure. In the figure, l is a contact operation plate, 2 is a switching plate, 3 is a switching prevention lever, 4 is a grounding indicator plate, 5 is a first link, 6 is a second link, 7 is a first pin, and 8 is a second link. 2 is a pin, 9 is a connecting rod, 10 is an interlock pin, 12 is a door, 13 is a compression spring, 15 is a stopper, and 17 is an interlocking plate. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] (1) An operating means for operating a disconnector for switching the main circuit that has been cut off from the electrical path to a grounded side or an energized side, a transmission means for driving an unlocking member near the door by a switching operation of the operating means, and the transmission means a switching means that operates in conjunction with the door section to enable switching of the operating means to the energized side only when the door section is locked; and a switching means that locks or unlocks the door section in conjunction with the operation of the transmission means. An interlock mechanism for an opening/closing device, comprising: a locking means; and an abutting means that abuts the transmission means to restrict the operation of the transmission means when the door of the locking means is in an open state.