JP3399631B2 - Switch spring device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spring device for driving a main contact such as a circuit breaker.

[0002]

2. Description of the Related Art FIG. 8 is a perspective view showing a conventional spring device for a switch, and FIG. 9 is a side view showing a closed state of the switch shown in FIG. In the figure, the upper terminals 1a, b, c leading to the main circuit
Are fixed to a breaker frame (not shown) via an insulator and are electrically connected to the fixed electrodes 3, respectively. A fixed electrode 3 and a movable electrode 4 are installed inside the vacuum switch tubes 2a, 2b and 2c, respectively.
The current is opened and closed by connecting and disconnecting. Flexible conductors 5a, b, c
Has its one end fixed to each movable electrode 4 and the other end fixed to a lower terminal (not shown). Even if the movable electrode 4 operates in the direction A-B shown in the drawing, the movable electrode is flexible due to its flexibility. 4 and a lower terminal (not shown) are always electrically connected.

Reference numerals 6a, b, and 6c denote insulating operation rods for operating the movable electrode 4, which also serves as electrical insulation between the main circuit and the ground portion, one end of which is fixed to the movable electrode 4 and the other end of which is the fixed electrode 3
And contacting springs 8a, b, c via contacting springs 7a, b, c for applying contact pressure between the movable electrodes 4. Numerals 12a, b, and c are levers pivotally mounted so as to rotate together with the crossbar 13 at the substantially central portion thereof, and one end of the levers is provided with pins 9a, b, and c for receiving the contact pressure spring 8a.
It is pivotally connected to a, b, and c. The other end of the lever 12a is pivotally attached to the operation rod 14 by a pin 15.
The bearings 16a and 16b rotatably support both ends of the crossbar 13 are fixed to a circuit breaker frame (not shown). Reference numeral 17 denotes an opening spring, one end of which is hooked on the pin 15, for maintaining the separated state of the fixed electrode 3 and the movable electrode 4 and providing the opening speed. Reference numeral 17a is a stopper that determines the opening position of both electrodes 3, 4 by the opening spring 17, and is fixed to the operating device frame.

Next, the operation of the conventional device constructed as above will be described. First, when the operating rod 14 is driven in the direction of arrow B in the figure by the driving force from an operating device (not shown), the levers 12a, b, c move around the crossbar 13 in the direction of arrow C (counterclockwise). Direction), lever 1
2a, b, c connected to the contact pressure spring receivers 8a, b,
c, the contact pressure springs 7a, b, c and the movable electrode 4 are driven in the A direction. Then, in the final state of rotation of the levers 12a, b, c, the electrodes 3 and 4 are closed. FIG. 9 shows the state.

[0005]

In the conventional spring device for a switch, the opening spring 17 is hooked on the pin 15 of the lever 12a pivotally mounted on the crossbar 13 and the other end is hooked on the operating device frame. It was Therefore, adjustment of the distance between the fixed electrode 3 and the movable electrode 4 and the contact pressure of the contact pressure springs 7a, b, c in the open state of the vacuum switch tubes 2a, b, c is not performed after the release spring 17 is locked. I could not carry out. Therefore, the main circuit unit including the vacuum switch tubes 2a, 2b, and 2c cannot be assembled and adjusted unless it is attached to the operating device frame, which hinders the unitization of the assembly, resulting in problems such as poor productivity. It was

The present invention has been made to solve the above-mentioned problems, and by providing an opening spring and a stopper inside the main circuit unit, the distance between both electrodes and the contact pressure of the contact pressure spring are adjusted. It is possible to achieve the above at the stage of assembling the main circuit unit portion to the device frame, and to achieve unitization of assembly and improvement of productivity.

[0007]

A spring device for a switchgear according to a first aspect of the present invention comprises an insulating lever having a hollow shaft portion made of a substantially cylindrical metal tube or the like, and the insulating lever is centered around the shaft portion. By rotating it, the pressure contact rod is driven to open and close the main contact, a torsion rod made of an elastic body is arranged in the hollow shaft of the insulator lever, and the spring energy storage lever is fixed to one end of this torsion rod. , The spring accumulating lever is rotatably held with the insulator lever, and has a stop lever at the other end of the torsion bar that rotates integrally with the insulator lever. The stopper is configured to come into contact with the stopper, and the insulating lever is rotated by an external operating mechanism.

According to a second aspect of the present invention, the stop lever is provided with a boss portion, the inner peripheral portion of which is fitted to the outer peripheral portion of the torsion bar,
The outer peripheral portion is adapted to fit with the inner peripheral portion of the hollow shaft portion of the insulator lever.

According to a third aspect of the invention, in the spring energy accumulating lever, the inner peripheral portion thereof is fitted with the outer peripheral portion of the torsion bar, and the outer peripheral portion thereof slides on the inner peripheral portion of the hollow shaft portion of the insulator lever. A boss portion that contacts is provided.

According to the invention of claim 4, the spring accumulating lever is formed by bending one end of the torsion bar into an L-shape.

[0011]

In the spring device of the opening / closing device of the present invention, the torsion bar made of an elastic body disposed in the hollow shaft portion of the insulator lever serves as an opening spring, and the stop lever fixed to one end of the spring rod is provided. By contacting the stopper of the insulating frame, rotation of the insulator lever is regulated to hold the fixed electrode and the movable electrode in the open position. Further, the spring-accumulating lever fixed to the other end of the torsion bar comes into contact with another stopper of the insulating frame, and the insulator lever is rotationally driven by an external operating mechanism to accumulate the open spring force. .

[0012]

EXAMPLES Example 1. 1 is a perspective view showing a spring device for a switch according to a first embodiment of the present invention, and FIG. 2 is a right side view of the spring device for the switch. In the figure, 1a, b, c are upper terminals communicating with the main circuit, 2a, b, c are vacuum switch tubes, 3a, b, c are fixed electrodes, 4a, b, c are movable electrodes, 5a, b, c are It is a flexible conductor and is similar to the conventional device. In the present embodiment, 18a, b and c are upper washers, 19a, b and c are lower washers, and the upper washers 18a, b and c and the lower washer 19a,
Coil-shaped contact pressure springs 7a, b, c are suspended between b and c, and contact pressure rods 20a, b, c are provided on the central axes thereof.
Has been inserted. The tips of the pressure contact rods 20a, 20b, 20c form a male screw structure 200, which is screwed into the female screw portion 400 of the movable electrodes 4a, b, c, and the flexible conductors 5a, 5b, 5c.
c is sandwiched and screwed by nuts 21a, 21b and 21c. Further, the other ends of the pressure contact rods 20a, 20b, 20c have a flange shape 201, and the lever portion 22 of the insulating lever 22 is provided.
It is in contact with the lower ends of a, b, and c. The upper washer 18
The positions of a, b and c are regulated by a nut 300, and the lower washers 19a, b and c are in contact with the upper ends of the lever portions 22a, b and c.

The insulating lever 22 is configured to rotate about a metal polygonal tube 220 as an axis, and the outer peripheral portion of the tube 220 is provided with lever portions 22a, 22b formed by resin integral molding or casting. have c. The center axis of the tube 220 is hollow, and the polygonal torsion bar 23 made of an elastic body is disposed inside the hollow. As the torsion bar 23, a bar-shaped torsion spring (torsion bar), a laminated body of leaf springs, or the like is used. A spring accumulating lever 24 is arranged at one end (right end in FIG. 1) of the tube 220. The spring accumulating lever 24 has a cylindrical boss portion 25, and the torsion bar 23 and the torsion bar 23 are provided inside the boss portion 25. A mating polygonal groove is formed. The outer peripheral portion of the boss portion 25 is rotatably inscribed and axially supported by the inner peripheral portion of the tube 22 of the insulating lever.

The other end of the tube 220 of the insulating lever (see FIG.
A stop lever 26 is installed at the left end), and the stop lever 26 is provided with a boss portion 27 having an outer peripheral portion having the same shape as the inner peripheral shape of the tube 220, and the boss portion 27 is fitted to the inner peripheral portion of the tube 220. And rotates integrally with the insulating lever 22. Further, the torsion bar 2 is provided at the center of the boss portion 27.
A polygonal groove that fits into the other end of the coil 3 is formed so that it can rotate integrally with the torsion bar 23.

Reference numeral 28 denotes a spring stopper, which is a torsion bar 23.
One end is engaged with the spring energy-accelerating lever 24 while the energy is being accumulated,
The other end engages with an insulating frame (not shown),
Play a role in preventing the brute force. The insulating lever 22 is rotatably supported by an insulating frame (not shown) via a bearing (not shown).

The operation of the spring device constructed as described above will be described with reference to FIGS. In FIG. 3, the state D (one-dot chain line) of the spring energy-accelerating lever 24 shows a released state, and the spring energy-accelerating lever 24 is rotated manually in the direction E to the position F (clockwise). The spring lever 28 is brought into contact with the spring stopper 28 to prevent the torque of the torsion bar 23 from rotating the insulating lever 22 in the direction opposite to E. On the other hand, due to the torsional torque of the torsion bar 23, the stop lever 26 connected to the other end of the torsion bar 23 and the insulating lever 22 fitted to the stop lever 26 try to rotate in the direction E of FIG. Since the convex portion 26a of 26 abuts on the insulating frame (not shown), rotation of the insulating lever 22 in the E direction is blocked, and the open state of the switch is maintained. This state is shown in FIG.

In FIG. 4, the driving force of an operating mechanism (not shown) rotates the stop lever 26 in the R direction, and when the driving force is transmitted, the stop lever 26 is fitted into the stop lever 26. The tube 220 and the insulating lever 22 integrated with the tube 220 are rotated in the R direction. When the insulating lever 22 rotates in the R direction, its lever portion 22a,
A contact pressure spring that drives the lower washers 19a, b, c that are in contact with b, c in the A direction, but is in contact with the upper washers 18a, b, c that are fixed to the contact pressure rods 20a, b, c. 7a,
Since b and c compress the lower washers 19a, 19b and 19c in the B direction, the rotational force of the insulating lever 22 in the R direction is the same as the lower washer 19b.
a, b, c, contact springs 7a, b, c and upper washer 18a,
The force acts to drive the pressure contact rods 20a, 20b, 20c in the direction A via points b, c.

By the movement of the pressure contact rods 20a, b, c in the A direction, the movable electrodes 4a, b, c screwed to the pressure contact rods 20a, b, c are also fixed electrodes 3a, b ,.
Move in direction A until it abuts c. After the movable electrodes 4a, b, c contact the fixed electrodes 3a, b, c, the movable electrodes 4a, b, c are prevented from moving in the A direction,
The movement of the pressure contact rods 20a, 20b, 20c in the A direction is also prevented. Accordingly, the rotational force of the insulating lever 22 in the R direction causes the lower washers 19a, 19b, 19c to move in the A direction, and the contact pressure springs 7a, 7a,
Try to compress b and c further.

Thereafter, the closing position of the insulating lever 22 is determined by the closing position of the operating mechanism (not shown), and the compression amount of the contact pressure springs 7a, 7b, 7c is G, as shown in FIG. Appears and the closing of the main contact is completed. In the above-described closed state, the torsion bar 23 is twisted at the rotation angle θ as compared with FIG. 4, so the rotational force for releasing the spring is stored.

When a release command is input to an operating mechanism (not shown), the energy stored in the contact pressure springs 7a, 7b, 7c and the torsion bar 23 causes the insulating lever 22 to rotate and finally to the state shown in FIG. Return to the open state.

As described above, according to the first embodiment, the main circuit unit (unit composed of all the components shown in FIG. 1)
Since the torsion bar 23 that plays the role of an opening spring and the stop lever 26 are included therein, the main circuit unit can be easily assembled to the insulating frame, and the productivity can be improved. In particular, fixed electrodes 3a, b, c and movable electrode 4
Adjustment of the distance between the electrodes of a, b, c, and the contact spring 7a,
The adjustment of the contact pressures of b and c can be made possible at the stage of assembling the main circuit unit, and the problem that the conventional adjustment can be made only after the insulating frame is assembled or engaged with the operating mechanism is solved. In addition, the adjustment of the contact opening distance between the main contacts is performed in the state of FIG.
This is performed by changing the position of the stopper (not shown) of the insulating frame with which the convex portion 26a of 6 contacts. Further, the contact pressure of the contact pressure spring 7 is adjusted by rotating the insulating lever 22 and reaching a predetermined closed position (rotation angle θ) (state of FIG. 5) by a predetermined compression amount G (wiping). ) Is output by rotating the contact pressure rod 20.

Example 2. 6 is a perspective view of a switch spring device according to a second embodiment of the present invention. In this embodiment, instead of the spring accumulating lever 24 of the first embodiment, one end of the torsion bar 23 is bent to form a spring accumulating lever portion 230, which comes into contact with the spring stopper 28. The other configurations are the same as those in the first embodiment. The operation of this embodiment will be described. The same as the first embodiment except that the torsion bar 23 is rotated from the released state in the direction E of FIG. 3 to engage the spring energy storing lever portion 230 and the spring stopper 28. Is. According to this embodiment,
In addition to achieving the same effects as in the first embodiment, the spring accumulating lever portion that abuts the spring stopper 28 can be created by simply processing the torsion bar 23, and the number of components of the main circuit unit can be reduced. There is.

Example 3. In the first and second embodiments described above, the case where the torsion bar 23 is placed inside the polygonal tube 220 integrated with the insulating lever 22 has been described. However, the crossbar 13 of the conventional device shown in FIGS. A torsion bar 23 may be provided inside, one end of which is connected so as to rotate together with the crossbar 13, and the other end of which may be a spring accumulating lever 230. An overall perspective view in this case is shown in FIG. According to this embodiment, the same effects as those of the first and second embodiments are achieved without changing the specifications of the conventional spring device for the switch.

[0024]

As described above, according to the invention of claim 1,
Since the torsion bar that plays the role of an opening spring and the stop lever that maintains the open state of the main contact are included in the main circuit unit, it is easy to assemble the main circuit unit to the insulating frame and improve productivity. can do. In particular, the adjustment of the distance between the fixed electrode and the movable electrode, and the adjustment of the contact pressure of the contact pressure spring can be performed at the stage of assembling the device frame of the main circuit unit, and an assembly unit can be realized.

That is, by adjusting the positions of the stoppers of the insulating frame with which the spring energy-accelerating lever and the stop lever come into contact with each other, the energy-accumulating state of the spring and the distance between the electrodes of the main contact can be adjusted.

According to the second aspect of the present invention, the stop lever fixed to the other end of the torsion rod and rotating integrally with the insulator lever can be formed by simple parts.

According to the third aspect of the present invention, the spring accumulating lever fixed to one end of the torsion rod and rotatably held with the insulator lever can be constituted by simple parts.

According to the fourth aspect of the invention, the spring accumulating lever portion can be formed by simply processing the torsion bar, and the number of constituent parts of the main circuit unit can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a spring device for a switch according to a first embodiment of the present invention.

FIG. 2 is a right side view of the spring device of the switch shown in FIG.

3 is a right side view of the spring device of the switch shown in FIG. 1. FIG.

FIG. 4 is a left side view, a front view, and a right side view showing an open state of the switch of the first embodiment.

5A and 5B are a left side view, a front view, and a right side view showing a closed state of the switch of the first embodiment.

FIG. 6 is a perspective view showing a spring device for a switch according to a second embodiment of the present invention.

FIG. 7 is a perspective view showing a spring device for a switch according to a third embodiment of the present invention.

FIG. 8 is an overall perspective view showing a conventional spring device for a switch.

FIG. 9 is a side view showing a closed state of a conventional switch.

[Explanation of symbols]

1a, b, c upper terminal, 2a, b, c vacuum switch tube, 3a, b, c fixed electrode, 4a, b, c movable electrode, 5a, b, c flexible conductor, 6a, b, c insulated operating rod , 7a, b, c contact pressure springs, 12a, b, c levers, 13 crossbars, 14 operation rods, 20a,
b, c Pressure contact rod, 22a, b, c Insulation lever, 2
20 tube, 23 torsion bar, 24,230 spring accumulating lever, 26 stop lever, 28 spring stopper.

Claims (4)

(57) [Claims] 1. A contact pressure spring for applying a contact pressure between a fixed contact and a movable contact, a contact pressure rod for mounting the contact pressure spring to open and close both the contacts, and a hollow shaft portion centering on the shaft portion. An insulator lever that drives the pressure contact rod in the opening and closing direction by rotating the lever, a torsion bar made of an elastic body disposed in the hollow shaft portion of the insulator lever, and an insulator fixed to one end of the torsion bar. the lever includes a stop lever rotatably retained spring energizing lever, rotating said fixed to the other end of the torsion bar integral with the insulator lever, said spring prestressing the lever and the stop lever, it
And contact the stopper of the insulation frame,
The insulation lever is opened by an external operating mechanism.
Closed spring device. 2. The stop lever has an inner peripheral portion in front of the stop lever.
Fits with the outer circumference of the torsion bar, and the outer circumference is insulated
Includes a boss that fits inside the hollow shaft of the body lever
The spring device for a switch according to claim 1, wherein: 3. The spring accumulator lever has an inner peripheral portion in front.
Fits with the outer circumference of the torsion bar, and the outer circumference is insulated
Includes a boss that slides in contact with the inner circumference of the hollow shaft of the body lever
The opening and closing according to claim 1 or 2, characterized in that
Spring device. 4. The spring accumulator lever is a member of the torsion bar.
It is characterized by being formed by bending the end into an L shape
Opening and closing according to any one of claims 1 to 3.
Spring device.