JPH0544765B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field to which the Invention Pertains] The present invention relates to a spring storage type operating device for a switchgear, which is often used in gas-insulated switchgear and the like, and the contact device includes a plug-in movable contact.

[Prior art and its problems]

As a conventional multipolar switchgear equipped with this type of operating device, for example, those shown in FIGS. 7 to 11 are known. In the figure, this switchgear is a three-pole type disconnector, and each contact device 10 is connected to a common switch shaft 1 rotatably supported.
1 is connected to cranks 12a, 12b, and 12c provided in the same. An operating device 20 is connected to the common opening/closing shaft 11 via a joint 13 fitted near the shaft end. The contact device 10 is a plug-in contact type, and includes a fixed contact 1 having a cylindrical shape with a bottom, and a cylindrical sliding contact, which is disposed coaxially and facing the fixed contact 1 and is connected to one side of an electric circuit, although not shown. It is guided by the contactor 2 and the sliding contactor 2 in a freely axially movable manner so that it can come into contact with and separate from the fixed contactor 1 . It is composed of a rod-shaped movable contact 3 and an insulating bar 4 that connects the movable contact 3 and cranks 12a, 12b, and 12c. Joint 13
consists of a lever 14 whose central part is fitted so as to be orthogonal to the axis of the common opening/closing shaft 11, and pins 15a and 15b which are implanted at both ends of the lever 14 and are parallel to each other and along the axis of the common opening/closing shaft 11. It is configured. The operating device 20 consists of a spring storage mechanism 30 and its drive device 40. Spring energy storage mechanism 30
is rotatably supported on the same axis as the common opening/closing shaft 11, and has a drive shaft 23 to which a winding lever 21 facing the joint 13 and a fork lever 22 that engages with the drive device 40 are fixed, and a joint between the common opening/closing shaft 11. 1
3 and the winding lever 21, and is capable of engaging with the pins 15a, 15b of the joint 13 with play along the rotation direction, and the tip of the drive lever 24 and the device fixing part. pin 25 between
It is composed of a compression spring 26 elastically loaded via a and 25b. The compression spring 26 is most loaded when the pin 25a is on the line connecting the axial center of the drive shaft 23 and the axial center of the pin 25b, that is, at the dead center, and is released when rotated in either direction. It is becoming more and more common. The winding levers 21 are substantially similar to the joints 13, and are opposed to each other, and the levers 1 are fitted at the center so as to be orthogonal to the axis of the drive shaft 23.
4, and a pin 28 which is implanted at both ends of the lever and is parallel to each other and can be engaged with the drive lever 24 with play along the rotation direction.
Fork lever 2 consisting of a and 28b.
Reference numeral 2 is composed of two identical members having a U-shaped shaft groove 22a with a bevel extending from the tip toward the shaft center and fixed to the drive shaft 23 at a distance. On the other hand, the drive device 40 is connected to a nut 31 that engages with the U-shaped groove 22a of the fork lever 22, a threaded rod 32 that is screwed into the nut 31 and moves the nut 31 forward and backward, and a reduction gear 33 to the threaded rod 32. drive motor 34
It is made up of.

In the above configuration, the operation of this device is as follows: First, the drive motor 34 is rotated to push up the nut 31, and then the fork lever 22 engages the drive shaft 2.
3 is rotated counterclockwise, the winding lever 21 integrated with the drive shaft 23 moves together, and the compression spring 26 is moved from the released state of FIG. 8 to the charged state of FIG. 10, that is, the dead center position. Rotated. Then, with the subsequent rotation of the drive shaft 23, the drive lever 24 is disengaged from the pin 28b of the winding lever 21.
The joint 1 is released by releasing the spring force of the stored compression spring 26.
The contact device 10 is separated by striking the pin 15a of No. 3 and rotating the joint 13 at once, and FIG. 11 shows the state in which the special separation process is completed. Note that the closing operation can be performed by performing the above-mentioned reverse rotation.

However, in the state shown in FIG.
6, the spring force of the compression spring 26 is required to overcome the static friction force (friction due to the contact force of the contact device 10, friction of the shaft support, etc.), and the compression spring As the size increases, the drive motor also becomes larger, resulting in a larger and more expensive device.

[Purpose of the invention]

The purpose of the present invention is to provide a spring storage type operating device for a switchgear, which eliminates the above-mentioned conventional drawbacks and reduces the size of the storage spring and drive motor without degrading the switching performance, thereby reducing the cost. be.

[Key points of the invention]

The main point of this invention is to achieve the above-mentioned purpose by creating a switching shaft that is connected to a plug-in movable contact of a switchgear, has a joint at the end of the shaft, and is rotatably supported; a drive shaft which is rotatably supported on the drive shaft and has a winding lever facing the joint fixed thereto and is connected to a drive device; a drive lever that rotates while engaging with the lever and engages with the joint with play along the rotational direction;
A spring energy storage device comprising a compression spring which is pin-coupled to the drive lever and stores energy when rotated by the drive device, and when the line of action of the spring exceeds a dead point of the pin connection, the compression spring is released to open and close. A driving piece is protrudingly provided to rotate the opening/closing shaft by engaging with the winding lever just before the compression spring completes storing energy, and starts the opening/closing shaft just before the compression spring is released, converting static friction into dynamic friction. It's because I let it happen.

[Embodiments of the invention]

1 to 6 are views showing an embodiment of a spring storage type operating device for a switchgear according to the present invention. In the drawings, the same parts as those of the conventional device shown in FIG. 7 described above are given the same reference numerals. We will explain the correspondence and emphasize the differences. The difference between this embodiment and the conventional device lies in the joint 43 fitted near the shaft end of the common opening/closing shaft 11, and the lever 44 constituting the joint 43.
However, the lever 14 in the conventional device shown in FIG.
A pin 45 that can be linearly engaged with is implanted. It should be noted that, as a matter of course, pins 15a and 15b are implanted in both leg pieces in the same way as the joint 14 of the conventional device, and the rest of the structure is the same as that of the conventional device shown in FIG.

The operation in the above configuration will be explained in conjunction with the conventional device shown in FIG. 7. First, the opening operation from the released state shown in FIG.
When the screw rod 32 is rotated to push up the nut 31, the drive shaft 23 is rotated counterclockwise by the fork lever 22. At this time, the winding lever 21 integrated with the drive shaft 23 moves together from the released state of the compression spring 26 shown in FIG.
Immediately before the end of energy storage as shown in the figure, that is, just before the dead center, the rotating force is turned to a state where the rotational force required for winding is small. In this state, the pin 28a of the winding lever 21 comes into contact with the pin 45 provided on the joint 73, and due to this contact, the joint 45, that is, the common opening/closing shaft 11, begins to rotate at the winding speed of the drive motor 34. When the common opening/closing shaft 11 begins to rotate, the movable contact 3 begins to slide off the fixed contact 1 while sliding on the sliding contact 2, as shown in FIG. 4, resulting in a state of dynamic friction, which is generally said to be about half of static friction. Become. Since the movable contact 3 moves only by the dimension a shown in FIG. 4 until it reaches the energy storage completion state (a state above the dead center) shown in FIG. Although it begins to come out, it is sufficiently smaller than the protrusion (contactable range) dimension b, so it is in a current-carrying contact state. Next, when the line of action passes the dead center, the joint 43 is struck via the drive lever 24 by the spring force released by the compression spring 26, and the common opening/closing shaft 11 is rotated all at once. That is, the spring is released while the movable contactor 3 is moving due to dynamic friction.

Although the opening/separating operation has been described above, the closing operation is a reverse operation as described above, and since there is only contact between the movable contact 3 and the sliding contact 2 when passing through the dead center, the load becomes lighter.

This means that almost no energy is needed for spring storage immediately before the compression spring 26 completes storage (dead center) as shown in FIG. 3, so the remaining energy of the drive motor 34 shown in FIG. Device 10
Therefore, the capacity of the drive motor 34 and the compression spring 26 can also be reduced.

〔Effect of the invention〕

According to this invention, by providing a drive piece in the joint of the opening/closing shaft that directly engages with the winding lever and rotates the opening/closing shaft immediately before the completion of storing energy in the compression spring, the spring storage of the opening/closing electric appliance can be made smaller and cheaper. We can provide a control device for the situation.

[Brief explanation of the drawing]

1 to 6 show an embodiment of a spring storage type operating device for a switchgear according to the present invention, FIG. 1 is a side view of the main part in a released state, and FIG. 2 is a plan view of FIG. 1. , FIG. 3 is a side view of the main part immediately before the completion of energy storage, FIG. 4 is an explanatory longitudinal sectional view of the contact device 10, FIG. 5 is a side view of the main part immediately before the start of release, and FIG. 7 to 11, which are cross-sectional views of main parts in a completed state, show an example of a conventional spring storage type operating device for a switchgear.
The figure is a perspective view including the main body, Fig. 8 is a side view of the main part in the released state, Fig. 9 is a plan view of Fig. 8, Fig. 10 is a side view of the main part in the fully charged state, and Fig. 11 is FIG. 3 is a side view of a main part in a state where discharge is completed. 3... Movable contact, 10... Contact device, 11... Common opening/closing shaft, 21... Winding lever, 23... Drive shaft,
24... Drive lever, 25a, 25b... Pin, 26
...Compression spring, 43...Joint, 45...Pin.

Claims (1)

[Claims] 1. An opening/closing shaft connected to a plug-in movable contact of a switching electric appliance and having a joint at the shaft end and rotatably supported, and facing the joint rotatably supported on the same axis as the opening/closing shaft. A drive shaft to which a winding lever is fixed and connected to a drive device, and a drive shaft that is loosely fitted between the winding lever of the drive shaft and the joint, and rotates by engaging with the winding lever when the drive shaft rotates, and connects to the joint. There is a drive lever that engages with play along the rotational direction, and is connected to the drive lever by a pin and stores energy by rotation by the drive device, and releases the energy when its line of action crosses the pin connection part that is the dead center. In the spring storage type operating device, the drive piece is provided on the joint to engage with the winding lever and rotate the opening/closing shaft immediately before the compression spring completes storage. A spring storage type operating device for a switchgear electrical appliance, characterized by the following.