JP3484849B2 - Switchgear - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switchgear, which is an improved interlock mechanism of a disconnector with a ground switch.

[0002]

2. Description of the Related Art A switchgear is provided with a disconnecting switch with a grounding switch, which is a combination of a disconnecting switch and a grounding switch. The disconnecting switch with grounding switch performs three operations of closing the main circuit, opening the main circuit, and grounding by rotating one movable blade and stopping it at three positions.

FIG. 4 shows the structure of a disconnecting switch with a grounding switch in a conventional switchgear. This disconnecting switch with a grounding switch can be operated electrically or manually.

First, the electric operation will be described. When a command to close the disconnector is given, the motor 1 rotates clockwise, and this rotational movement is reduced by the reducers 2 and 3,
The movable blade 8 is transmitted to the link mechanism 7 via the Geneva mechanism 6 including the Geneva driver 4 and the Geneva wheel 5.
Rotates from the "open" position to the "closed" position. As a result, the main circuit conductors 9 and 10 are connected via the movable blade 8 and the disconnector is in the "closed" state.

When the movable blade 8 is rotated to the "closed" position, the pin of the Geneva driver 4 and the slit of the Geneva wheel 5 are engaged with each other, so that the rotational motion is not transmitted to the rotary seal 11 and the movable blade 8 is properly moved. Stop at a certain position. When the movable blade 8 stops, the limit switch 12 operates to stop the motor 1.

On the other hand, when a command to open the disconnector is given, the motor 1 rotates counterclockwise. Then, the blade 8 rotates in the opposite direction to the above, and the disconnector "opens".
When the state becomes, the limit switch 12 operates and the motor 1 stops. At this time, the rotation transmission is not blocked by the Geneva mechanism 6, and the rotation motion is transmitted to the position where the ground switch is "closed".

Next, the manual operation will be described. The three operations of "opening" and "closing" of the disconnecting switch and "closing" of the grounding switch can be performed manually, but the "closing" operation of the grounding switch cannot be performed by electric operation. "Open" disconnector
Only when the movable blade 8 completely occupies the three positions of the "closed" position and the "closed" position of the earthing switch, the handle 15 is inserted from the insertion hole 14 formed in the front plate 13 or vice versa. An interlock mechanism 16 that can be removed and cannot be inserted while it is in the middle
Is provided. The interlock mechanism 16 is configured as shown in FIG. When the movable blade 8 is not in the 3 position, the locking coil 17 is demagnetized and the plunger 18 projects to engage the lock lever 20 integrated with the shutter 19 that closes the insertion hole 14. It cannot be inserted into the insertion hole 14. At this time, the letters "lock" written on the display nameplate 21 can be seen through the window 22. On the other hand, when the movable blade 8 occupies three positions, the locking coil 17 is excited and the plunger 18 is retracted, and the engagement with the lock lever 20 is released. Therefore, if the pin 23 is moved upward against the biasing force of the spring 24, the shutter 19 can be rotated clockwise. Then, the insertion hole 14 is opened and the word "release" on the display nameplate 21 is displayed on the window 22, and the handle 15 can be inserted into the insertion hole 14 and connected to the operation shaft 27. The movable blade 8 can be operated by turning the handle 15 in either direction, and if the movable blade 8 is brought into contact with the grounding terminal 26, the grounding state is achieved. When the movable blade 8 occupies a position other than the third position, the interlock mechanism 16 operates so that the handle 15 cannot be pulled out. That is, the locking coil 17 is demagnetized during the manual operation, the plunger 18 engages with the groove 25 of the handle 15 and the word "locking" is displayed on the window 22 as shown in FIG. 6 (a). To be done. For this reason,
When you start turning the handle 15, the display on the window 22 will be "released".
To "locked", and becomes "locked" in the middle of positions other than 3 and becomes "released" at 3 position. When the movable blade 8 is tightened at any one of the three positions and the display is "released", the handle 15 can be removed.

As described above, since the movable blade is operated by the single operating mechanism so as to occupy the three positions, the handle can be attached and detached only in the specified three positions, and cannot be attached and detached during the operation. . In order to satisfy this condition, conventionally, an interlock mechanism using a lock coil is provided.

[0009]

However, since the locking coil is used, the interlock mechanism does not operate without the control power supply. In addition, since there is no stop mechanism that temporarily stops the movable blade when it turns to each position, the disconnecting switch passes from the “closed” position to the “open” position all at once to the grounded switch “closed” position. There is a risk of turning it.
Furthermore, since the portion that mechanically locks the lock lever is the plunger of the locking coil, the plunger must be made large, and the locking coil itself becomes large.

Therefore, an object of the present invention is to provide an opening / closing device that solves the above problems.

[0011]

The structure of the invention according to claim 1 for achieving the above object is to form a circumferential groove and a lock hole in the handle, and at the same time, to insert the circumferential groove and the lock hole into the circumferential groove of the handle. Locking pins for sliding that prevent attachment / detachment and lock pins for rotation that slip into the lock holes when the movable blade occupies three positions and temporarily prevent rotation of the handle are urged to the handle respectively, and both lock pins are restrained. A restraint member that opens and closes is provided, and the restraint member is synchronized and interlocked with the operation shaft that connects the handle so that the movement of both lock pins is restrained only when the movable blade occupies a position other than three It is characterized in that a handle for manually moving the lock pin is provided.

According to a second aspect of the present invention, the restraining member is provided with engaging holes for engaging both lock pins, and is provided so as to be movable so as to restrain and release both lock pins, and the movable blade has three positions. Is provided with a cam for pushing the restraint member only when the lock pin is occupy to release both lock pins, and the cams are synchronized and interlocked with the operation shaft to form a synchronizing means.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail based on the embodiments shown in the drawings.

The structure of the interlock mechanism of the disconnecting switch with a grounding switch in the switchgear according to the present invention is shown in FIGS. This interlock mechanism allows the handle to be attached / detached only at the three positions described above when the switchgear with a grounding switch is manually operated so that the handle cannot be attached / detached during operation, and the movable blade is temporarily stopped at each position. It was designed so that it would not pass through.

A handle 29 shown in FIG. 3 is used as a handle for connecting to the operating shaft 27. A circumferential groove 30 is formed on the outer peripheral surface of the handle 29 near the tip thereof, and tapered surfaces 31, 32 are formed on the side surface of the circumferential groove 30 and the tip of the handle 29. At a position slightly away from the circumferential groove 30, a lock hole 33 penetrating in the diameter direction is formed.
Are formed.

The circumferential groove 30 of the handle 29 is the handle 29
Restrain the movement of the handle in the axial direction, and handle 2 except at the 3 position.
It is to prevent 9 from being inserted or removed. As shown in FIG. 1B, when the handle 29 is connected to the operating shaft 27, the slide lock pin 34 whose tip faces the circumferential groove 30 is formed in the support plates 35 and 36.
Is movably supported in the axial direction of the pin via 7, 38,
A spring 39 as a first biasing means for pressing the slide lock pin 34 downward is provided with a spring receiver 40 and a support plate 35.
It is provided between and. 41 is a stopper. Further, at a position facing the lock hole 33 in the handle 29,
A rotation lock pin 42 is provided in parallel with the slide lock pin 34 and restrains the rotation of the handle 29 in a state of being biased downward similarly to the slide lock pin 34. The rotation lock pin 42 is provided with a handle 43 that can be manually moved in the axial direction of the pin against the biasing force of the spring 39.

Slide and rotation lock pins 34, 42
The slide shaft 44 that is long in the direction perpendicular to
It is slidably supported through a guide hole formed in 6. A restraint member 47 is fixed to one end of the slide shaft 44 to restrain or release the slide and rotation lock pins 34 and 42 so as not to move in the axial direction of the pins. The restraint member 47 is formed by bending a flat plate into an L shape, one side is fixed to the slide shaft 44, and the other side is provided with engaging holes 48 and 49 for inserting the sliding and rotating lock pins 34 and 42. Has been formed. The slide and rotation lock pins 34 and 42 are formed such that the small diameter portion in the drawing has a circular cross section and the large diameter portion has a square cross section, and the slide shaft 44 moves to the left as shown in FIG. 2 (c), the circular cross-section portion engages with the semi-circular portions of the engaging holes 48, 49 for sliding,
The rotation lock pins 34 and 42 are restrained. A roller 50 is rotatably provided at the other end of the slide shaft 44.
A cam 51 as a synchronizing means that engages with 0 is fixedly provided to the connecting shaft 52. The cam 51 is formed in a shape having three vertices, and the connecting shaft 52 is linked to the operating shaft 27 in synchronization so that the position of the vertices presses the roller 50 each time the movable blade 8 occupies the above-mentioned three positions. ing. A spring 54 as a second biasing means is provided between the support member 46 and the spring receiver 53.

Next, the operation of the opening / closing device will be described.
In order to manually operate the disconnecting switch with the earthing switch, the handle 29 is first inserted through the insertion hole 14 and connected to the operating shaft 27. At this time, if the movable blade 8 does not occupy any one of the above-mentioned three positions, as shown in FIG.
1 does not push the roller 50 and the slide shaft 4 is moved by the spring 54.
4 has moved to the left in FIG.
As shown in (c), the engaging holes 48 in the restraint member 47,
Lock pin 3 for sliding and rotating in the semicircle of 49
The lock pins 4 and 42 are pushed in and both lock pins are restrained so as not to move in the axial direction. Therefore, the sliding lock pin 34 is locked while being pressed downward, and the sliding lock pin 34 interferes with the insertion of the handle 29. If the movable blade 8 occupies any of the three positions, the cam 51 pushes the roller 50 as shown in FIG. 1 and the slide lock pins 34, 42 for sliding and rotating as shown in FIG. The restraint member 47 is released. Therefore, the handle 29 is inserted after the handle 43 is held and the rotation lock pin 42 is raised against the biasing force of the spring 39. Then, the slide lock pin 34, which is urged downward by the spring 39, is pushed up by the tapered surface 32 shown in FIG. 3, and when the insertion of the handle 29 is completed, the tip of the slide lock pin 34 is changed to FIG. As shown, enter the circumferential groove 30.

After that, the handle 43 is held in the raised state until the handle 29 is turned in any direction 2-3 times. Then, as shown in FIG.
1 is for sliding so that the roller 50 is not pushed,
The rotation lock pins 34 and 42 are constrained, and the rotation lock pin 42 is constrained as it is without dropping even when the hand is released from the handle, while the slide lock pin 34 is constrained in the lowered state and is set to the three positions. When the movable blade 8 occupies the middle, the handle 29 cannot be pulled out because the slide lock pin 34 does not move.

When the movable blade 8 occupies any one of the three positions by further rotating the handle 29 7 to 8 times, FIG.
As shown in (a), sliding lock pins 34, 4 for rotation
Since 2 is released, the rotation lock pin 42, which was restrained at the upper position, is urged downward by the urging force of the spring 39,
When the movable blade 8 occupies any of the three positions, the tip of the rotation lock pin 42 slips into the lock hole 33.
Therefore, when the movable blade 8 occupies any of the three positions, the rotation of the handle 29 is restrained, and the movable blade 8 moves to the 3 position.
Whenever it comes to any of the positions, it will stop once.

To rotate the movable blade 8 to the next three positions, the handle 43 is lifted and the handle 29 is moved by a few steps.
Release the handle 43 after turning. Then the next 3
When the movable blade 8 reaches the position, the rotation lock pin 42 descends again and the handle 29 is restrained.

When the movable blade 8 occupies three positions, the sliding and rotating lock pins 34 and 42 are released as shown in FIG. 1, so that the handle 43 is held and the rotating lock pin 4 is held.
It is sufficient to pull out the handle 29 with 2 being raised. Since the slide lock pin 34 is not restrained, the handle 29 can be pulled out by being pushed up by the tapered surface 31 of the handle 29.

Although the lock hole is a lock hole that penetrates the handle in this embodiment, it may be a recess without penetrating. Although the slide shaft is interposed between the restraint member and the cam, the restraint member may be directly pushed by the cam.

[0024]

As can be seen from the above description, according to the opening / closing device of the first and second aspects, the lock pin for sliding and the lock for locking / unlocking the handle insertion / removal and rotation are provided.
When the movable blade occupies a position other than 3 positions, a restraint member for restraining the slide lock pin and the rotation lock pin is provided. The action with stop can be performed. In addition, the interlock mechanism according to the present invention requires less space and a smaller number of parts than the conventional interlock mechanism using the lock coil.

[Brief description of drawings]

1A and 1B show a case where an interlock mechanism of a disconnecting switch with a grounding switch showing an embodiment of a switchgear according to the present invention is not locked, in which FIG. 1A is a left side view, and FIG. 1B is a front view. (C) is an A-A arrow view of (b).

2A and 2B show a case where an interlock mechanism of a disconnecting switch with a grounding switch showing an embodiment of a switchgear according to the present invention is in a locked state, where FIG. 2A is a left side view and FIG. 2B is a front view.
(C) is a BB arrow line view of (b).

FIG. 3 is a configuration diagram of a handle according to an interlock mechanism of a disconnecting switch with a grounding switch, which shows an embodiment of a switchgear according to the present invention.

FIG. 4 is a configuration diagram of a disconnector with a grounding switch in a conventional switchgear.

5A and 5B relate to an interlock mechanism of a disconnecting switch with a grounding switch in a conventional switchgear, in which FIG. 5A is a plan view and FIG. 5B is a sectional view taken along line CC of FIG.

6A and 6B show a state when a handle is inserted in an interlock mechanism of a disconnecting switch with a grounding switch in a conventional switchgear, in which FIG. 6A is a plan view and FIG. 6B is a front view.

[Explanation of symbols]

8 ... Movable blade 14 ... Insertion hole 27 ... Operation axis 29 ... Handle 30 ... Circumferential groove 31, 32 ... Tapered surface 33 ... Lock hole 34 ... Lock pin for slide 39, 54 ... Spring 42 ... Rotating lock pin 43 ... Toride 44 ... slide shaft 47 ... Restraint member 48, 49 ... Engagement holes 50 ... 51 ... cam

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-7-262887 (JP, A) JP-A-2-270227 (JP, A) Actually open 6-70139 (JP, U) Actually open 4- 115737 (JP, U) Actual development 3-74437 (JP, U) Actual development 2-5245 (JP, U) Actual development 63-167615 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01H 33/46

Claims (2)

(57) [Claims] 1. A movable blade occupies three positions of closing and opening of a disconnecting switch and closing of a grounding switch by rotating the movable blade, and a handle is detachably attached to an operation shaft linked to the movable blade. In a switchgear provided with a disconnecting switch with a ground switch, a circumferential groove is formed on the outer peripheral surface of the handle, and a tapered surface is formed on the tip of the handle and the side surface of the circumferential groove to separate from the circumferential groove. A lock hole is formed in the diametrical direction at the position, while the lock pin for sliding has a tip facing the circumferential groove when the handle is mounted on the operating shaft, and a rotation where the tip faces the position of the lock hole in the axial direction of the handle. And a lock pin for sliding are provided so as to be movable in the axial direction of the respective pins in a state of being substantially parallel to each other, and are biased toward the handle through the first biasing means. Detention Alternatively, a restraint member for opening is provided, and the restraint member is interlockingly connected to the operation shaft via a synchronizing means so that the restraint member releases the slide lock pin and the rotation lock pin only when the movable blade occupies the three positions. An opening / closing device comprising a handle for manually moving the rotation lock pin to the opposite handle side against the biasing force of the second biasing means. 2. The restraint member is provided with an engagement hole for engaging and restraining the slide lock pin and the rotation lock pin, and in a direction of restraining and releasing the slide lock pin and the rotation lock pin inserted into the engagement hole. A restraint member is provided so as to be reciprocally movable, and as the synchronizing means, a cam is provided which pushes the restraint member only when the movable blade occupies the three positions to open the slide and rotation lock pins, and synchronizes the cam. The opening / closing device according to claim 1, further comprising a second urging unit that is interlocked with the operation shaft and urges the restraint member toward the cam.