JPH07296687A - Vacuum breaker - Google Patents

Abstract

PURPOSE:To reduce the occurrence of a deviation between a central line between the main circuits of a vacuum breaker and the central line of a mold frame by a method wherein a lever is formed by using an insulating material. CONSTITUTION:When a vacuum valve 2 is closed, a rotary shaft 11 is rotated clockwise and a plate-form ring 19 is moved rightward. As a result, a flange 17 is pressed by a ring 19, a moving electrode terminal 6 is pressed to the right to close the valve 2. When the valve 2 is opened, by rotating the shaft 11 counterclockwise, a drive rod 16 is moved leftward and the valve 2 is opened. In this case, the rod 16 is arranged at the terminal 6 and the shaft 11 to drive the rod 16 through an insulating lever 21 is arranged in the vicinity of the rod 16. Thus, a distance between the terminal 6 and the shaft 11 is short. This constitution reduces the occurrence of a deviation between a central line CL1 between main circuit terminals 3 and 4 and the central line CL4 of the mold frame 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a vacuum circuit breaker which is attached to a panel of a switchboard and the like.

[0002]

2. Description of the Related Art FIG. 4 is a perspective view of a conventional vacuum circuit breaker, and FIG. 5 is a sectional view taken along the line VV in FIG. In FIG. 4 and FIG. 5, three vacuum valves 2 are provided in the mold frame 1, and the main circuit terminal 3 is connected to the fixed electrode terminal 5 of the vacuum valve 2 and led out to the upper part of the drawing. . The movable electrode terminal 6 of the vacuum valve 2 is adapted to move linearly in the direction of arrow 6A in FIG. 5, and is connected to the main circuit terminal 4 via a flexible conductor 7. The main circuit terminal 4 is also led out in the upper part of the figure. Each of the three main circuit terminals 3 and 4 is connected to the R, S, and T phases of the three-phase electric circuit, respectively. The movable electrode terminal 6 is an insulating rod 8 made of an electrically insulating material such as plastic or ceramic.
It is connected to the metallic link mechanism 9 via. The insulating rod 8 electrically insulates the movable electrode terminal 6 and the link mechanism 9 from each other. The link mechanism 9 is connected to a metal lever 10. The movable electrode terminals 6 of the three vacuum valves are all provided with the same mechanism as described above.

Each lever 10 of the three vacuum valves 2 is fixed to one metal rotary shaft 11 arranged at right angles to the moving direction of the movable electrode terminal 6 shown by an arrow 6A. Figure 4
In the above, an operation mechanism portion 12 is provided at one end of the mold frame 1, and when the vacuum circuit breaker is attached to the panel of the switchboard, the operation mechanism portion 12 is attached to the inner surface of the panel. A face plate (not shown) is provided on the outer surface of the switchboard to shield the mounting holes and the like. One end of the rotary shaft 11 is connected to an operating mechanism (not shown) provided in the operating mechanism section 12. The operation mechanism is the operation mechanism unit 12
It is operated by an operation handle (not shown) provided on the outer surface of the. When opening and closing this vacuum circuit breaker, the operating handle can be operated to rotate the rotary shaft 11 and simultaneously open and close three vacuum valves.

[0004]

In the conventional vacuum circuit breaker, as shown in the sectional view of FIG. 5, the insulating rod 8 is provided between the movable electrode terminal 6 and the link 9 of the vacuum valve 2.
Is provided, the distance between the movable electrode terminal 6 and the lever 10 becomes long. As a result, in the mold frame 1, the mounting position of the vacuum valve 2 is moved to the right in the figure. Since the main circuit terminals 3 and 4 are led out upward from the positions of the fixed electrode terminal 5 and the movable electrode terminal 6 of the vacuum valve 2, the lead-out positions of the main circuit terminals 3 and 4 are positions on the right side of the mold frame. That is, the center line CL1 of the main circuit terminals 3 and 4 and the center line CL of the mold frame 1
2 is shifted by the length L1.

In general, the operating mechanism section 12 is made according to the outer shape of the mold frame 1.
The center line CL3 of is substantially coincident with the center line CL2 of the mold frame. As a result, the center line CL3 of the operation mechanism section 2 and the center line CL1 of the main circuit terminals 3 and 4 are substantially deviated by L1 as shown in FIG. When mounting such a vacuum circuit breaker on a panel of a switchboard, etc., the operation mechanism section 1
The center line CL3 of 2 is made to substantially coincide with the vertical center line of the panel. As a result, the center line CL1 of the main circuit terminals 3 and 4
Will be offset from the center line of the panel.

Among the conventional switchboards of this type, those using an oil circuit breaker are widely used, but when modifying such a switchboard, the oil circuit breaker is often replaced with a vacuum circuit breaker.
Generally, in an oil circuit breaker, the center line CL3 of the operation mechanism section
And the center line CL1 of the main circuit terminal coincide with each other. The oil circuit breaker is attached to the switchboard such that the centerline between the two main circuit terminals (corresponding to the centerline CL1) coincides with the centerline of the switchboard. Therefore, for example, when the oil circuit breaker is replaced with a vacuum circuit breaker, both center lines CL1 in the vacuum circuit breaker are replaced.
Center line CL of the main circuit terminal due to the deviation L1 between
1 does not coincide with the center line of the switchboard, and a great deal of labor is required to connect the main circuit conductor to the main circuit terminal. If the main circuit conductor is extremely thick or has no flexibility such as a bus bar, connection may not be possible. In order to avoid the above problem, the vacuum circuit breaker is usually attached to the switchboard by moving it to the left so that the centerline CL1 coincides with the centerline of the switchboard. However, if it is moved to the left side in this way, an extra space is required on the left side of the switchboard. The problem was to eliminate this point.

It is an object of the present invention to provide a vacuum circuit breaker in which the center line between main circuit terminals of the vacuum circuit breaker and the center line of the mold frame are less displaced.

[0008]

A vacuum circuit breaker of the present invention is a vacuum valve provided in a frame, and a first electrode led out of the frame from a fixed electrode terminal of the vacuum valve.
Main circuit terminal, a second main circuit terminal derived from the movable electrode terminal of the vacuum valve to the outside of the frame, a drive member provided on the movable electrode terminal for moving the movable electrode terminal, and a drive member. It is provided with a connected insulating member having electrical insulation and a rotating shaft to which the insulating member is fixed and which drives the driving member via the insulating member.

[0009]

By configuring the lever with an insulating material, it is not necessary to interpose an insulating member between the lever and the movable electrode terminal, and the distance between the lever and the movable electrode terminal can be shortened.

[0010]

1 is a sectional view of a vacuum circuit breaker according to an embodiment of the present invention. The overall appearance of the vacuum circuit breaker of this embodiment is similar to that of the conventional example shown in FIG. 2, three vacuum valves 2 are provided in the depth direction of the paper surface of FIG. 1, and six main circuit terminals 3 are provided. And 4 are led out to the upper part of the mold frame 15 made of an insulating material. In FIG. 1, the main circuit terminal 3 is connected to the fixed electrode terminal 5 of the vacuum valve 2 provided in the mold frame 15. The main circuit terminal 4 is connected to the movable electrode terminal 6 of the vacuum valve 2 via a flexible conductor 7. The movable electrode terminal 6 is provided with a metal drive rod 16 for driving the movable electrode terminal 6 in the direction of arrow 6A to open and close the vacuum valve 2. Drive rod 16
Is provided with two flanges 17 and 18 at a predetermined distance. Further, the drive rod 16 is provided with a plate-shaped ring 19. The plate-shaped ring 19 has an inner diameter slightly larger than the outer diameter of the drive rod 16, and is movable on the drive rod 16 by sliding in the axial direction. A compression coil spring 20 is arranged between the plate ring 19 and the flange 17.

The insulating lever 21 is made of, for example, an insulating material such as plastic such as epoxy resin or ceramic, and its tip portion 21A is formed in a U shape having two pieces in the depth direction of FIG. A drive rod is engaged in the groove, and each tip portion 21A is inserted between the flange 18 and the plate ring 19. Further, the other end of the insulating lever 21 has a mounting hole, and the metal rotating shaft 11 is inserted and fixed in the mounting hole. The drive rod 16 having the same structure is provided in three vacuum valves arranged side by side in the depth direction of the paper surface of FIG. Then, three insulating levers 21 fixed to one common rotating shaft 11 are engaged with the respective drive rods 16. It is desirable to provide an insulating barrier 21B made of the same material as the insulating lever 21 in the vicinity of the mounting hole of the insulating lever 21. The insulating barrier 21B is for electrically connecting to the movable electrode terminal 6 and keeping the same electric potential between the drive rod 16 and the metallic rotating shaft 11 to prevent an electric discharge or a flash path between them. It is a thing. An insulating plate 21C is provided at the boundary between two adjacent insulating levers 21 in order to maintain insulation between the phases.

Next, the operation of this embodiment will be described. When the vacuum valve 2 is closed, when the rotary shaft 11 is rotated clockwise, the tip portion 21A of the insulating lever 21 also rotates clockwise, and the plate ring 19 is moved to the right in the figure. As a result, the flange 17 is pushed by the plate-like ring 19 via the spring 20, and the movable electrode terminal 6 is pushed rightward in the figure to close the vacuum valve 2. The moving stroke of the movable electrode of a general vacuum valve is, for example, about 7 mm.
The opening / closing operation can be performed by rotating 1 to 7 to 8 degrees. At this time, the force applied to the movable electrode terminal 6 is the spring 2
Since it is determined according to the strength of 0, the pressure of the movable electrode in contact with the fixed electrode inside the vacuum valve 2 can be set to a predetermined value by appropriately selecting the strength of the spring 20. When opening the vacuum valve 2, the drive rod 16 is moved to the left in the drawing by rotating the rotary shaft 11 counterclockwise in FIG. 5, and the vacuum valve 2 is opened. According to the present invention, the movable electrode terminal 6 is provided with the drive rod 16,
A rotary shaft 11 that drives the drive rod 16 via an insulating lever 21 is provided near the drive rod 16. Therefore, the distance between the movable electrode terminal 6 and the rotating shaft 11 is short. Therefore, the deviation L2 between the center line CL1 between the main circuit terminals 3 and 4 and the center line CL4 of the mold frame 15 can be reduced. As a result, when the vacuum circuit breaker is mounted on the switchboard, the distance that the vacuum circuit breaker projects to the left in the switchboard is small even when the centerline CL1 is mounted so as to match the centerline of the switchboard. Further, FIG. 1 of the mold frame 15
Since the overall length in the left-right direction is shortened, the vacuum circuit breaker is downsized.

In the vacuum circuit breaker shown in FIG. 1, the rotating shaft 11 is constructed so as to be perpendicular to the operating mechanism section 23. However, in general, as another type of vacuum circuit breaker, for example, as shown in FIG. 2, the rotary shaft 11 is arranged in parallel with the front surface of the operation mechanism section 23, and three vacuum valves 2 are provided. Some are arranged vertically. When the embodiment of the present invention is applied to such a type of vacuum circuit breaker, there is an effect that the depth dimension from the rear surface 23A of the operation mechanism portion 23 to the rear surface 15A of the vacuum circuit breaker is shortened as shown in FIG. Another type of vacuum circuit breaker is shown in FIG. In this type, the rotary shaft 11 is arranged parallel to the front surface of the operation mechanism portion 23, and when this vacuum circuit breaker is attached to the panel of the switchboard, the three vacuum valves 2 are arranged in the vertical direction of the panel. They are arranged in parallel. In this example, if the configuration of the embodiment of the present invention is adopted, there is an effect that the vertical dimension of the drawing is shortened.

[0014]

According to the present invention, the drive rod 16 is directly connected to the movable electrode terminal 6 of the vacuum valve.
A rotary shaft 11 for driving 6 via an insulating lever 21 is provided near the drive rod 16. Therefore, the movable electrode terminal 6
The distance between the rotary shaft 11 and the rotary shaft 11 is short. Therefore, the deviation between the center line CL1 between the main circuit terminals 3 and 4 of the vacuum valve and the center line CL4 of the mold frame 15 of the circuit breaker can be reduced. Further, since the distance between the movable electrode terminal 6 and the rotating shaft is short, the vacuum circuit breaker can be downsized.

[Brief description of drawings]

FIG. 1 is a sectional view of a vacuum circuit breaker according to an embodiment of the present invention,

FIG. 2 is a perspective view of a vacuum circuit breaker having a structure of another example to which the embodiment of the present invention is applied,

FIG. 3 is a perspective view of a vacuum circuit breaker having a configuration of still another example to which the embodiment of the present invention is applied,

FIG. 4 is a perspective view of a conventional vacuum circuit breaker,

FIG. 5 is a sectional view of a conventional vacuum circuit breaker,

[Explanation of symbols]

2 vacuum valves, 3 and 4 main circuit terminals, 5 fixed electrode terminals, 6 movable electrode terminals 11 rotating shafts, 15 mold frames, 16 drive rods, 17, 18 flanges, 19 plate-shaped rings, 20
Spring, 21 isolated lever.

Claims (3)

[Claims] 1. A vacuum valve provided in a frame, a first main circuit terminal led to the outside of the frame from a fixed electrode terminal of the vacuum valve, and a lead electrode to the outside of the frame from a movable electrode terminal of the vacuum valve. Second main circuit terminal, a driving member provided on the movable electrode terminal for moving the movable electrode terminal, an insulating member having electrical insulation connected to the driving member, and the insulating member fixed and insulated. A rotary shaft that drives the drive member via a member, a vacuum circuit breaker. 2. The vacuum circuit breaker according to claim 1, wherein three vacuum valves are provided to open and close a three-phase electric circuit. 3. The driving member has a first member on each end of a rod-shaped member.
And a second flange, and a ring-shaped member that is connected to the movable electrode terminal in the vicinity of the first flange and is movably fitted to the rod-shaped member. The vacuum circuit breaker according to claim 1, wherein a spring is provided between the ring-shaped members, and the insulating member is engaged between the second flange and the ring-shaped member.