JPH117871A - Switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate rotation by a stopper of a trip hook moved by energizing force of a cutoff spring when a vacuum interrupter is closed, and hold engagement with a roller by arranging a clearance between projecting parts so that the stopper having a rotation constraining part to an anti-roller side projecting part of the trip hook does not collide with the projecting parts moved by a collision of the roller. SOLUTION: A stopper 43 is installed by threadedly engaging a nut 45 with a screw part 43a inserted into an upper guide hole 44 of an installing plate 42, has a rotation constraining part 43b to a trip hook 37 having projecting parts 37a to 37d. Even if a camshaft 23 moves rightward since a roller 36 collides with the projecting part 37a by energizing force of a cutoff spring by a clearance G between the projecting part 37b and the rotation constraining part 43b whose height H from a roller 36 under surface is adjusted by operation of a nut 45 and a bolt 48, the projecting part 37b does not collide with the stopper 43. Since torque is not generated in the trip hook 37, engagement of the roller 36 and the projecting part 37a is held, and a return spring and a tripping electromagnet 41 may be small.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening and closing device, and has an improved operation unit.

[0002]

2. Description of the Related Art As a switchgear, there is a solid insulated switchgear in which a charged portion is molded and insulated from a resin. As shown in FIG. 4, the solid insulated switchgear is divided into a fixed part 1 and a movable part 2, and the movable part 2 is provided with wheels 3 and can be carried in and out.

First, the fixing section 1 will be described. In the figure,
4 is a three-phase cable, 5 is a cable-side disconnection connected to the cable 4, 6 is a grounding switch, 7 is an operation box for operating the grounding switch 6, 8 is a three-phase bus, and 9 is a bus. It is a side disconnection part.

Next, the movable section 2 will be described. Reference numeral 16 denotes a pole, 10 denotes a three-phase true-phase interrupter, 11 and 12 denote external conductors that are led out of the vacuum interrupter 10 and are connected to the cable-side disconnection portion 5 and the bus-side disconnection portion 9, and 13 operates the vacuum interrupter 10 Operating unit, 14 is a control unit, 1
Reference numeral 5 denotes a screw shaft which is turned by a handle for connecting and separating the movable part 2 to and from the fixed part 1 by screw connection.

Next, the structure of the operation unit 13 will be described with reference to FIG. First, the closing spring 17 is charged as follows. When the output shaft of the motor 18 rotates,
The rotating force is transmitted to the rotating plate 20 via the speed reducer 19,
The claw 21 whose one end is rotatably connected to the eccentric position of the rotary plate 20 reciprocates. Then, the claw 21 becomes the claw wheel 22
Is rotated intermittently little by little in the same direction, so that the camshaft 23 supported so as to rotate only in the same direction via the one-way clutch rotates in the direction of the arrow. As the camshaft 23 rotates, the upper end of the closing spring 17 attached to the camshaft 23 via the lever 27 is charged,
When the rotation of the cam shaft 23 passes the dead point, the roller 24
Is engaged with the closing hook 25, and the limit switch is turned off.
And the rotation of the motor 15 stops. Thus, the charging of the closing spring 17 is completed.

The charging is performed as follows. When the throwing command causes the throwing electromagnet 26 to rotate the throwing hook 25, the roller 24 comes off the throwing hook 25, and the throwing spring 17 is released. Then, together with the camshaft 23, the camshaft 2
3 is rotated at a high speed and the rollers 29 are rotated.
Extrude. Then, the main shaft 32 rotates in the direction of the solid arrow while compressing the blocking spring 30 and the press-contact spring 31 provided on the main shaft 32 via the lever 30a, and the insulating rod 3
3 moves in the direction of the solid arrow. As shown in FIG.
The moving direction of the insulating rod 33 is converted into upward movement of the movable lead 35 via the triangular lever 34, and the vacuum interrupter 10 is turned on.

At the time of insertion, the roller 36 attached to the main shaft 32 via a lever 36a swings in a direction away from the trip hook 37, and is rotatably attached to the cam shaft 23 via a bearing 38 and a return spring. The trip hook 37 urged by 39 returns and comes into contact with the stopper 40. At this time, as shown in FIG. 6A, the distance from the axis of the trip hook 37 to the tip thereof is set to be smaller by a than the maximum radius dimension of the input cam 28.
The roller 36 is engaged with the trip hook 37 by the release of the blocking spring 30, and the closed state of the vacuum interrupter 10 is maintained.

Finally, the shut-off operation will be described. When a cutoff command is issued, the tripping electromagnet 41 is moved to the trip hook 37.
push. Then, the trip hook 37 is disengaged from the roller 36, and the stored spring 30 is released.
The roller 36 moves toward the center of the trip hook 37.
For this reason, the main shaft 32 rotates in the direction of the dashed arrow, and the vacuum interrupter 10 is shut off.

[0009]

However, when the vacuum interrupter is turned on, the release force of the cut-off spring causes the vacuum interrupter shown in FIG.
6B collides with the trip hook 37 as shown in FIG. 6 (b), the cam shaft 23 momentarily moves rightward by b, and at the same time, the trip hook 37 is counterclockwise due to the presence of the stopper 40. There is a possibility that the engagement with the roller 36 may be disengaged. For this reason, the spring constant of the return spring 39 must be increased, and the tripping electromagnet must be made strong. As a result, the size of the switchgear increases.

On the other hand, if the stopper is disposed at the position P in FIG. 6A, when the roller 36 collides with the trip hook 37, a gap is formed between the trip hook 37 and the stopper 40, so that no problem occurs. However, since the cantilevered camshaft 23 returns to the left thereafter, the trip hook 37 also receives a counterclockwise force.

Therefore, an object of the present invention is to provide a switchgear which solves the above problem.

[0012]

According to a first aspect of the present invention, there is provided an opening / closing device having a roller provided on a main shaft interlockingly connected to an opening / closing portion via a first lever. One end of the shut-off spring is connected via a lever, and a trip hook for restraining a swingable roller in a state where the open / close portion is closed and the shut-off spring is charged is provided.
It consists of a shaft that is rotatable around an axis provided on an extension of the track on which the roller swings, and at least a pair of protrusions that protrude in opposite directions, and the roller and the pair of protrusions are A stopper for stopping the rotation of the trip hook at a position on the same straight line, a biasing means for rotating the trip hook until it comes into contact with the stopper, and a trip for rotating the trip hook against the biasing force of the biasing means. And an electromagnet,
The stopper is provided with a rotation restricting portion for restricting the rotation of the projecting portion of the trip hook on the side opposite to the roller, and the projecting portion and the stopper are moved so that the projecting portion moved by the collision of the roller does not collide with the stopper. A gap is formed between them.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. In this embodiment, since a part of the conventional opening / closing device is improved, the same reference numerals are given to the same parts as those in the related art, and the description thereof will be omitted.

(A) Embodiment 1 Embodiment 1 of the switchgear according to the present invention is shown in FIG. The present invention is an improved stopper for restraining the rotation of the trip hook. As shown in FIG.
Is attached. That is, it is as follows. A guide member 50 is welded to the upper portion of the mounting plate 42, and a guide hole 44 is formed in the guide member 50 along the vertical direction.
Are formed.

The stopper 43 has a screw portion 43a formed in the guide hole 4
4 and is suspended from the guide member 50 by screwing the nut 45.

The stopper 43 has a rotation restricting portion 43 for restricting the trip hook 37 from turning clockwise.
b is formed.

In order to set the stopper 43 at a certain height and fix it to the mounting plate 42, the mounting plate 42 has a vertically long slot 46 formed therein.
7 is formed, and a bolt 48 inserted into the long hole 46 is screwed into the tap hole 47.

The trip hook 37 has four protrusions 37a at every 90 degrees along the circumferential direction around the shaft 37e.
37d are formed, one end of a return spring 39 is connected to the protrusion 37b, and the tripping electromagnet 41 faces the protrusion 37c.

Next, the operation of the switching device will be described. First, in order to set the height position of the stopper 43, the bolt 4
Loosen 8 and nut 45. Then, the return spring 39 acts and the stopper 43 is pulled downward. From this state, the nut 45 is tightened so that the height H from the lower surface of the roller 36 to the upper surface of the rotation restricting portion 43b becomes a predetermined value. Then, the bolt 48 is tightened. Here, the gap G between the projecting portion 37b and the rotation restricting portion 43b is set to a value such that the tip of the projecting portion 37b does not collide with the stopper 43 even when the camshaft 23 moves rightward in FIG. .

When the vacuum interrupter is turned on, the roller 36 is displaced by the release force of the shut-off spring to cause the projection 3 of the trip hook 37 to move.
When it collides with 7a, the trip hook 37 moves to the right. However, since there is a gap G, the protruding portion 37b does not collide with the stopper 43, and no rotational force acts on the trip hook 37. Therefore, the engagement between the roller 36 and the projecting portion 37a does not come off.

(B) Second Embodiment FIG. 2 shows a main part of a switchgear according to a second embodiment of the present invention. In this embodiment, a spring 49 is interposed between the guide member 50 and the stopper 43 in FIG.

Since the spring 49 is provided, when the bolt 48 is loosened, the stopper 43 is securely lowered until the nut 45 comes into contact with the guide member 50 by the force of the spring 49. The other configuration and operation are the same as those of the first embodiment, and thus the description is omitted.

(C) Embodiment 3 Finally, the main parts of a switchgear according to Embodiment 3 of the present invention are shown in FIG.
Shown in The stopper 43 has an elongated hole 51 extending in the vertical direction, while a pin 52 implanted in the mounting plate 42 is inserted into the elongated hole 51, and the stopper 43 is guided so as to be able to move up and down. On the other hand, a double screw bolt 53 having right and left threads formed at both ends is screwed to the guide member 50 and the stopper 43, and the lock nuts 54 and 55 are screwed to the double screw bolt 53.
Is screwed into.

In such an opening and closing device, when adjusting the height of the stopper 43, the lock nuts 54 and 55 are loosened, and the double screw bolt 53 is rotated in either direction. When the stopper 43 guided by the pin 52 and the elongated hole 51 has an appropriate height, the lock nuts 54 and 55 are tightened again. Other configurations and operations are the same as those in the first embodiment.
Description is omitted.

In the first to third embodiments, the tripping electromagnet 4
Although 1 faces the projection 37c, it can also face the projection 37b. Therefore, the protrusion 37d can be deleted, or the protrusions 37c and 37d can be deleted and only the protrusions 37a and 37b can be used.

[0026]

As can be seen from the above description, claim 1
According to the opening / closing device according to the above, the trip hook that is moved is not rotated by the stopper even if the roller pushes the trip hook, and the engagement between the roller and the trip hook is prevented by the biasing force of the blocking spring when the vacuum interrupter is turned on. There is no departure. Further, since no rotational force is generated on the trip hook, not only the spring constant of the return spring of the trip hook can be reduced, but also a small electromagnet having a small force can be used as the tripping electromagnet.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating a main part of a first embodiment of a switchgear according to the present invention.

FIG. 2 is a configuration diagram showing a main part of a second embodiment of the switchgear according to the present invention.

FIG. 3 is a configuration diagram illustrating a main part of a third embodiment of the switchgear according to the present invention;

FIG. 4 is a configuration diagram of a conventional solid insulated switchgear.

FIG. 5 is a perspective view of an operation unit in a conventional solid insulated switchgear.

FIG. 6 is a diagram illustrating the operation of an operation unit in a conventional solid insulated switchgear.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Vacuum interrupter 23 ... Cam shaft 30 ... Cut-off spring 30a ... Lever 32 ... Main shaft 36 ... Roller 36a ... Lever 7 ... Trip hook 37a, 37b ... Projection part 37e ... Shaft part 39 ... Return spring 41 ... Pulling-out electromagnet 43 ... Stopper 43b: rotation restricting portion G: gap.

Claims (1)

[Claims] 1. A roller is provided on a main shaft interlockingly connected to an opening / closing unit via a first lever, and one end of a shut-off spring is connected via a second lever to close the open / close unit and store the shut-off spring. A trip hook is provided for restraining a roller that can swing in a biased state. The trip hook is opposite to a shaft that is rotatable about an axis provided on an extension of a track on which the roller swings. At least a pair of protrusions protruding in the direction, and a stopper for stopping the rotation of the trip hook when the roller and the pair of protrusions are located on the same straight line, and a rotation of the trip hook until it comes into contact with the stopper. A biasing means, and a tripping electromagnet for rotating the trip hook against the biasing force of the biasing means, wherein the stopper is provided on the stopper to prevent the projecting portion of the trip hook on the side opposite to the roller from rotating. Dynamic restraint An opening / closing device, comprising a portion, and a gap formed between the protrusion and the stopper so that the protrusion moved by the collision of the roller does not collide with the stopper.