JP2001006499A - Electric power breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify assembly structure, improve reliability, and adjust switch operation point simply in a switch mechanism for detecting blade opening and closing. SOLUTION: In this electric power, breaker a limit switch 9A for detecting 'open' of a blade and a limit switch 9B for detecting 'close' of the blade are arranged in a shaft end peripheral region of a blade opening and closing shaft which is assembled in a base 3 of the breaker and is connected with an opening and closing operation lever for the blade opening and closing shaft. A switch operation member is mounted on a blade opening and closing shaft side to open and close the limit switches in the interlocking relationship with opening and closing operation of the blade. A plate cam 14 is fitted, inserted, and positioned on the blade opening and closing shaft 5 as the switch operation member and is welded and connected with a shaft part so that the limit switches for detecting 'open' and 'close' are accurately opened, closed, and operated through the plate cam without unevenness of an operation point when the blade is opened, closed, and operated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power V-shaped disconnector as a power device, and more particularly, to a structure of a switch mechanism for detecting "open" and "close" of a blade.

[0002]

2. Description of the Related Art First, the general structure of a V-type disconnector for a three-phase circuit to which the present invention is applied is shown in FIGS. 5 (a) and 5 (b). In the figure, 1 is a blade (disconnect blade), 2 is a fixed contact, 1
Reference numerals a and 2a denote connection terminals to the bus bar, 3 denotes a box-shaped base (housing of the operation mechanism), 4 denotes terminals 1a of the blade 1, support insulators for the fixed armatures 2, and 5 denotes a shaft extending over each pole to the base 4. The supported blade opening / closing axis, 6 is the blade opening / closing axis 5
A manual opening / closing operation lever connected to one end of the blade 7 is linked to the blade opening / closing shaft 5 (incorporated in the base 3).
And an operation rod (pull bar) connected to the blade 1 of each pole via an opening. Further, an opening / closing detection switch mechanism 8 described later is provided at the shaft end of the opening / closing shaft 5 protruding laterally from the base 3.

The opening / closing operation of the disconnector having such a configuration is well known, and a hook bar (not shown) is attached to the operation lever 6.
When the opening / closing axis 5 is rotated from the solid line position to the chain line position, the blade 1
Opens to the broken line position and disconnects the electric circuit.

FIG. 4 shows the structure of an open / close detection switch mechanism 8 employed in a conventional power disconnector. In the figure, 9A is "closed" for detecting the ON position of the blade 1.
The detection limit switch 9B is an "open" detection limit switch for detecting the OFF position of the blade 1. Both limit switches 9A and 9B are arranged side by side and fixed to a mounting plate 10 mounted on the end face of the base 3. ing. A switch operating lever 11 is disposed between the limit switches 9A and 9B, and a pair of drive bottles 12A, 12A and 12B are shifted from the one end by approximately 90 degrees on the axis of the blade opening / closing shaft 5 opposite to one end thereof. 12B. Further, the switch operating lever 11 is biased to a neutral position by two balancing springs (tensile springs) 13.

In this configuration, when the blade 1 is pulled to the ON position by the opening / closing operation lever 6 shown in FIG. 5, the blade opening / closing shaft 5 rotates counterclockwise and the drive bottle 12A is switched at the end limit position. Operation lever 11
Push. Thus, the switch operation lever 11 swings clockwise about the support shaft 11a to turn on the "close" detection limit switch 9a. Meanwhile, blade 1
Is driven toward the OFF position, the blade opening / closing shaft 5 rotates clockwise, contrary to the above, and the other drive rod 12B moves the switch operating lever 11 at its end limit position.
To swing the lever counterclockwise. Thus, the “open” detection limit switch 9B is turned ON. The adjustment of the opening / closing operation point for the limit switches 9A and 9B is performed by adjusting the bottles of the drive rods 12A and 12B.

[0006]

The above-mentioned conventional open / close detection switch mechanism has the following disadvantages in terms of functions. That is, in the configuration shown in FIG. 4, the switch operating lever 11, which is the operating member of the limit switches 9A and 9B for detecting the "open" and "close" of the main contact, is separated from the blade opening / closing shaft 5 and supported so as to be balanced. The spring 13 biases the spring to the neutral position. In such a structure, when vibration is applied, the switch operation lever 11 may swing unexpectedly and cause the limit switches 9A and 9B to malfunction.
There is also a problem that it is difficult to adjust the switch operating lever 11 to the neutral position using the two balancing springs 13.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a switch mechanism for detecting blade opening and closing together with simplification of the assembly structure and improvement of reliability.
An object of the present invention is to provide a power disconnector improved so that adjustment of a switch operating point can be easily performed.

[0008]

According to the present invention, in order to achieve the above object, a blade opening / closing shaft incorporated in a base of a disconnector and connected to an opening / closing operation lever is provided with a shaft end peripheral region of the opening / closing shaft. A limit switch for detecting the "open" and "close" of the blade is disposed on the blade, and a switch operating member is mounted on the blade opening / closing shaft side in opposition to the limit switch. In a power disconnector that opens and closes a switch, a plate cam is directly attached to the blade opening / closing shaft as the switch operating member, and the "open" and "close" detection limit switches are opened and closed via the plate cam. It is configured as described above (claim 1), and specifically, is configured as an assembly structure in the following mode.

(1) A plate cam is inserted and positioned on the blade opening / closing shaft facing the limit switch, and then welded to the shaft portion. (2) A stepped cam mounting seat is formed on the shaft end surface of the blade opening / closing shaft, and a plate cam is overlapped on the mounting seat surface to fasten the bottle (claim 3). (3) As the plate cams, two plate cams respectively corresponding to limit switches for detecting "open" and "close" of the blade are mounted on the shaft ends of the opening / closing shaft.

When the opening / closing lever is operated to drive the blade toward the ON / OFF position by operating the opening / closing lever, when the lever opening / closing shaft is rotated, the plate cam directly connected to the opening / closing shaft is rotated, and the blade cam is rotated. The plate cam opens and closes the "closed" and "open" detection limit switches in accordance with the ON and OFF positions.

[0011] In this case, as described in the previous section (3), "open",
Equipped with two plate cams corresponding to the "closed" detection limit switch and individually, without being affected by variations in the assembly positions of the "open" detection and "closed" detection limit switches The operating point of each limit switch can be individually adjusted.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the illustrated embodiments. In the drawings of the respective embodiments, the same members corresponding to FIG. 4 are denoted by the same reference numerals, and the detailed description thereof will be omitted.

[Embodiment 1] FIGS. 1A to 1C show an embodiment of a V-shaped disconnector according to a second aspect of the present invention. In this embodiment, the switch mounting plate 10 which surrounds the shaft end of the blade opening / closing shaft 5 and is attached to the end plate 3a of the base 3 has "closed" detection limit switches 9A, A limit switch 9B for "open" detection is installed facing each other, and a plate cam 14 is mounted as a switch operating member on the axis of the opening / closing shaft 5 so as to face each of the limit switches 9A and 9B. The plate cam 14 is provided on the periphery of the ring-shaped boss 14a.
In this structure, the boss 14a is inserted into the blade opening / closing shaft 5 and positioned, and then welded to the opening / closing shaft 5.

With this configuration, the opening / closing lever 6 shown in FIG.
Is operated to move the blade 1 toward the ON / OFF position, the lever opening / closing shaft 5 and the plate cam 14 coupled to the lever opening / closing shaft 5 are rotated accordingly, and the ON / OFF end of the blade 1 is driven. In accordance with the position, the cam portion 14b of the plate cam 14 is set to the "closed", "open" detection limit switch 9A,
The lever 9a of 9B is pushed to open and close.

Embodiment 2 FIGS. 2A to 2D show an embodiment corresponding to claim 3 of the present invention. In this embodiment, a switch mounting plate 10 on which limit switches 9A and 9B are mounted is fixed to an end plate 3a of a base 3 via a support post 10a, and the limit switches 9A and 9B are fixed.
A plate cam 14 as a switch operating member is screwed to the shaft end of the blade opening / closing shaft 5 so as to face B.

Here, the plate cam 14 has a shape in which a screw hole 14c is opened in the boss portion and the right side thereof is cut straight as shown in FIG. On the other hand, (d)
As shown in the figure, a stepped cam mounting seat 5a and a screw hole are formed in accordance with the boss shape of the plate cam 14. Then, the plate cam 14 is fastened by the screw 15 and fixed at a fixed position in a state where the plate cam 14 is overlapped and positioned on the cam mounting seat 5a.

The operation of the switch mechanism having such a configuration is the same as that of the first embodiment. When the blade opening / closing shaft 5 rotates during the opening / closing operation of the blade, the plate cam 14 rotates together with this to “close”. "Open" detection limit switch 9A,
9B is opened and closed.

[Embodiment 3] FIG. 3 shows an embodiment corresponding to claim 4 of the present invention. In this embodiment, two plate cams 14A, 14A are used as switch operation members.
B, the plate cams 14A and 14B are superimposed and temporarily fastened to the shaft end of the blade opening / closing shaft 5 with a screw 15, and in this state, the plate cams 14A and 14B are closed and opened. After individually positioning with respect to 9A and 9B, screws are fixed so as not to move from this position. According to this embodiment, it is possible to individually adjust the opening / closing operation points for the "closed" and "open" detection limit switches 9A and 9B, as compared with the first and second embodiments.

[0019]

As described above, according to the present invention, the plate cam is directly mounted on the blade opening / closing shaft as a switch operating member for the blade "open" detection and "close" detection limit switches. "Open" via cam,
By configuring the "close" detection limit switch to open and close, the number of parts is reduced compared to the conventional structure, the structure is simplified, and the open / close detection switch may malfunction due to vibration. No reliability is improved. In addition, a limit switch for the open / closed state of the blade and two corresponding plate cams respectively mounted on the shaft end of the open / close shaft are provided as plate cams. The positioning can be adjusted individually for each of the "open" detection limit switch and the "close" detection limit switch, which is convenient.

[Brief description of the drawings]

FIG. 1 is an assembly configuration diagram of an opening / closing detection switch mechanism corresponding to a first embodiment of the present invention, wherein (a) is a front view, (b) is a side view, and (c) is a plan view of a plate cam.

2A and 2B are assembly configuration diagrams of an opening / closing detection switch mechanism corresponding to a second embodiment of the present invention, wherein FIG. 2A is a front view, FIG. 2B is a side view, FIG. d) is a partial side view with the plate cam attached to the open / close shaft.

FIG. 3 is a front view of an opening / closing detection switch mechanism according to a third embodiment of the present invention;

FIG. 4 is a front view showing an assembling structure of a conventional switch mechanism for opening / closing detection.

FIG. 5 is an overall configuration diagram of a V-shaped disconnector to which the present invention is applied, (a) is a front view, and (b) is a side view.

[Explanation of symbols]

 Reference Signs List 1 blade 3 base 5 blade opening / closing shaft 5a cam mounting seat 6 opening / closing operation lever 8 opening / closing detection switch mechanism 9A “closed” detection limit switch 9B “open” detection limit switch 14, 14A, 14B plate cam 15 fastening screw

Claims (4)

[Claims] A limit switch for detecting the "open" and "close" of the blade is provided around the shaft end of the open / close shaft connected to the open / close operating lever by being incorporated into the base of the disconnector. A switch operating member mounted on the blade opening / closing shaft side facing the limit switch, and opening and closing the limit switch in conjunction with opening / closing of the blade; A power disconnecting device wherein a plate cam is directly attached to a blade opening / closing shaft, and "open" and "close" detection limit switches are opened and closed via the plate cam. 2. The power disconnector according to claim 1, wherein the plate cam is inserted and positioned on the shaft of the blade opening / closing shaft facing the limit switch, and then welded to the shaft portion. Power disconnector. 3. The power disconnector according to claim 1, wherein a stepped cam mounting seat is formed on an end surface of the blade opening / closing shaft.
A power disconnector, wherein a plate cam is overlapped on the mounting seat surface and the bottle is fastened. 4. A power disconnector according to claim 1, wherein two plate cams respectively corresponding to the "open" and "close" detection limit switches for the blades are mounted on the shaft ends of the open / close shaft as plate cams. A power disconnector characterized by the following.