JPS64771B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a closing mechanism for a breaker.

As is well known, various devices are used for the closing mechanism of the breaker. Among these devices is a loading mechanism that uses a link mechanism and an eccentric cam. This closing mechanism rotates an eccentric cam to press a roller provided on a link mechanism to the dead point of the link mechanism as the cam rotates, thereby loading the sheath cutter. However, in this closing mechanism, it is difficult to set the positional relationship between the link and the cam, and it has been desired to improve the efficiency of the closing mechanism by reducing the closing spring force.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a closing mechanism for a disconnector, which can reduce the closing spring force and improve the efficiency of the closing mechanism.

An embodiment of the present invention will be described below with reference to the drawings.

Figures 1 to 3 are schematic configuration diagrams showing the closed state, the free trip state, and the tripped state of the vacuum shield breaker, respectively. 2 is the operation part of the vacuum shield disconnector 11;
3 is an operating shaft, and 4 is a blade spring. Reference numeral 5 denotes an operating rod, one end of which is connected to the operating shaft 3, and the other end is connected to the multi-joint link mechanism 21.
This link mechanism 21 includes first to third links 6, 9,
22, and one end of the first link 6 is pivotally supported by a rod 5 and a pin 7. 8 is link mechanism 2
The first roller 8 is provided at the pivot point of the other end of the first link 6 and one end of the second link 9. Reference numeral 10 denotes a second roller provided at a pivot point between the other end of the second link 9 and one end of the third link 22. Note that the other end of the third link 22 is pivotally connected to a base (not shown). 12 is a trip hook, 13 is a tripping electromagnet, 14 is a closing cam engaged with the first roller 8, and 15 is a stopper. The specific structure of the link mechanism 21, the closing cam 14, etc. is shown in FIG.

In FIG. 4, reference numeral 23 denotes a frame, within which the charging cam 14 is pivotally supported by a main shaft 24. As shown in FIG. The closing cam 14 is rotated half a turn by the release of the closing spring which is stored by a motor (not shown) attached to the frame 23 via an energy storage mechanism (not shown), and then is turned off via the link mechanism 21. Vessel 11
This is for input operation. The input cam 14 is formed into a substantially spiral cam surface 14a, as shown in FIG. The link mechanism 21 is operated by the closing cam 14 to close the sheath breaker 11 and maintains the closed state of the sheath breaker 11.

In the embodiment configured as shown in FIGS. 1 to 4 above, when the tripping electromagnet 13 is operated from the closed state shown in FIG.
As a result, the trip hook 12 overcomes the spring 12a and rotates counterclockwise, and the engagement between the second roller 10 and the trip hook 12 is released. At this time, the third link 22 also rotates counterclockwise, causing the first and second links 6 and 9 to move rapidly downward under the action of the shear spring 4, so that the shear breaker 11 is rotated counterclockwise. As shown in FIG. 2, they are separated. Thereafter, the third link 22 is reversed clockwise by the return spring 16, and the trip hook 12 and the second roller 10 are engaged again, resulting in a closing start state as shown in FIG. In order to insert the vacuum shield and disconnector 11 from the state shown in FIG. 3, the inserting cam 14 is moved counterclockwise, and the first roller 8 is pushed leftward.
As a result, the second link 9 is rotated counterclockwise, and the first link 6 is pushed up and the sheath disconnector 11 is rotated.
is injected. The positional relationship between the input cam 14 and the first roller 8 at this time is a feature of the present invention.
This relationship is shown in FIG.

In FIG. 5, the positional relationship between the closing cam 14 and the first roller 8 when closing the shear breaker 11 is as follows. Input cam 14 and first roller 8
The charging cam 14 is arranged so that the center point _O1 of the circular arc of the charging cam 14 at the point 20a where the charging cams 14 and Set the rotation center O. By arranging the closing cam 14 and the first roller 8 in this manner, the component force P _x of the first link 6 always exceeds the component force P _y of the second link 9. 18 is the resultant force point of the first and second links 6 and 9, and 17 and 19 are line segments.

Also, the input cam 14 is rotated at an angle of 2 in the direction of the arrow shown in the figure.
When rotated by 0a, O ₁ , 20b, the center point of the arc of the engagement point between the input cam 14 and the first roller 8 is as shown in the figure.
Moving on to O ₂ , by making the above positional relationship hold even in this case, the relationship of P _x > P _y is always maintained while the closing cam 14 is operating, so the closing operation force increases and the closing spring You will be able to reduce your power. Conventionally, this is because the positional relationship between the closing cam and the roller was not taken into account, so the component force often satisfies P _x > P _y . _x became smaller than P _y , and the closing spring force had to be increased by that amount. For this reason, the efficiency of the charging mechanism has been reduced.

As described above, according to the present invention, by configuring the arc center point of the charging cam at the engagement point between the charging cam and the roller to be always located below the center point of the roller, the link mechanism can be improved. The closing spring force is reduced by making the disconnection closing operating force greater than the reaction force, thereby improving the efficiency of the closing mechanism.

[Brief explanation of drawings]

Figures 1 to 3 are schematic configuration diagrams of an embodiment of the present invention applied to a closing and tripping mechanism for a breaker, Figure 4 is an enlarged view of the main parts of the present invention, and Figure 5
The figure is an explanatory diagram for describing the configuration and operation of the present invention. 6...First link, 7...Pin, 8...First roller, 9...Second link, 10...Second roller, 14
...Insertion cam.

Claims (1)

[Claims] 1 It has a multi-joint link mechanism 21 whose one end side is pivotally attached to the base and whose other end side is connected to the cutter 11, and a roller 8 is provided in the middle part of this link mechanism 21 and engaged with this roller 8. At the same time, link mechanism 2
In a closing mechanism for a shredder breaker, which is equipped with a charging cam 14 that inserts the shredder breaker 11 by extending the shaft 1, the circular arc of the charging cam at the point where the charging cam 14 and the roller 8 engage. Formed so that the center point is always below the center point of the roller 8 during the operation of the closing cam,
A closing mechanism for a bow breaker, characterized in that the force for closing the bow breaker of a link mechanism 21 is greater than the reaction force.