JPS5971223A - Actuator with vacuum breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a spring-loaded operating device for a vacuum breaker.

FIG. 1 is a perspective view showing an example of a conventional spring-loading type operating device for a vacuum breaker. In FIG. 1, a case 1 houses an operating device, and both ends of an opening/closing shaft 20 are rotatably supported by the case 1 via bearings 3. This opening/closing shaft 2 has a crank h.

One end of the crank 2b is fixed, and a movable electrode of vacuum pulp (not shown) is connected to the other end of the crank h.

Further, the other end of the crank 2b is connected to a connecting rod 4.

The closing spring 5 is supported by a holder 6 attached to both ends thereof, and a pin 8 passing through a hole in the holder 6 and a hole in an arm fixed to the case l. The other end of the closing spring 5 is attached to a drive shaft 11 of a drive device 10 by a holder 6 via a crank 9, and is connected to a connecting rod 4 via the drive device 10.

When the closing spring 5 is energized by the drive device IO,
When released, the connecting rod 4 moves in the direction of the arrow P and rotates the opening/closing shaft 2 via the crank 2b. At the same time, the crank h rotates, moving the movable electrode connected to the other end in the direction of the arrow Q and bringing it into contact with the fixed electrode, thereby turning on the vacuum breaker. FIG. 2 shows the relationship between the distance the movable electrode moves from when it starts moving until it contacts the fixed electrode and when the breaker is turned on, and the force P required to move it. In Fig. 2, the force required for the movable electrode to move is Ll (as shown by Fl) during the period from when the movable electrode starts moving from position O to point a where it contacts the fixed electrode.
stroke) increases only slightly with a relatively small force. However, after the movable electrode contacts the fixed electrode, this force must rise to a point where the movable electrode and the fixed electrode are brought into contact because the contact between the movable electrode and the fixed electrode is butt contact. Further, the force of the closing spring gradually increases as shown by F2 and reaches its maximum at point b. The area indicated by diagonal lines is the energy E for imparting the input speed to the movable electrode.

In general, a vacuum breaker has a small opening distance L1 and does not require a high closing speed, so it can be closed with relatively small energy E, but as described above, it requires a large force at the closing position. Further, the closing spring force F=B/L+ has a large value because the separation distance L1 is small. This means that a spring with a small displacement and a large force is required. In order to fix the end of such a strong closing spring 5, a sturdy arm 7 must be firmly fixed to the case frame by welding or the like. Furthermore, the case 1 itself must be sturdy. Further, the other end of the closing spring 5 is connected to the drive shaft 11 via the crank 9, so in order to rotate the drive shaft 11 or to rotate the drive shaft 11, the closing spring 5 must be connected to the pin 8. Needless to say, the pin 8 must be strong because it rotates using the holder 6 and the pin 8 as a fulcrum. There is a problem with having to insert smaller bearings. Furthermore, since the closing spring of the vacuum breaker is housed deep inside the operating device case, it is difficult to install it. As described above, the supporting part of the closing spring of a vacuum breaker requires a strong structure, but in the past, this supporting part was specially provided and attached to the case, which is difficult to construct and expensive. There is.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and provide a vacuum breaker operating device that is simple, easy to operate, and inexpensive.

The purpose of this is to store energy in a closing spring that is fixed at one end, use this energy to rotate the opening/closing shaft, and to move the movable electrode via a crank fixed to this opening/closing shaft for closing. In the vacuum breaker operating device, one end of the closing spring is supported by the opening/closing shaft via a bearing with a low coefficient of friction.

The vacuum breaker operating device according to the present invention aims to support the strong force generated by the energy accumulated in the closing spring with a simple device, and the structure other than this supporting part is exactly the same as the conventional operating device, so it will be explained below. will be omitted, and examples of the supporting portion will be described in detail based on the drawings. In FIG. 3, the opening/closing shaft 2 is rotatably supported by the case 1 via a bearing 3, as in the conventional case. A spring holder 6 is attached to one end of the closing spring 5, and the spring holder 6 is supported by the opening/closing shaft 2 via a ball bearing 12. The rest of the structure is exactly the same as the conventional one. Originally, this opening/closing shaft 2 is strongly attached directly to the case l via a bearing 3 due to the application of a large force, so if one end of the closing spring 5 is supported on this opening/closing shaft 2, the strength The arms 7 and pins 8, which are difficult to work in order to obtain sufficient strength as in conventional fixing devices, can be omitted without giving any extra consideration. However, since the opening/closing shaft is rotatable and its rotational friction must be small, a bearing with a low friction coefficient such as a ball bearing is inserted between the opening/closing shaft and the closing spring holder to increase the rotational friction. Preventing.

The operation of this operating device is exactly the same as that of the conventional one, so a description thereof will be omitted.

As described above, the present invention has a structure in which one end of the closing spring of the vacuum breaker actuator is supported by an opening/closing shaft with an originally sturdy mounting structure via a bearing with a small coefficient of friction. In addition to eliminating the weak point of the operating device, the rotation of the opening/closing shaft is supported by a spring without interfering with a bearing with a low coefficient of friction, making it an inexpensive and excellent operating device that has a simple structure and workmanship.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the main parts of a conventional vacuum breaker operating device, Fig. 2 is a diagram showing the relationship between the stroke of the movable electrode, the force for moving it, and the load of the closing spring, and Fig. 3 The figure is a perspective view showing a support portion of the operating device closing spring according to the present invention. 2... Opening/closing axis, %, 2b... Crank, 5...
Closing spring, 12...ball bearing. - Ma - ''Figure 71

Claims (1)

[Claims] 1) Energy is stored in a closing spring with one end fixed,
In a vacuum breaker operating device in which an opening/closing shaft is rotated by this energy and a movable electrode is moved and closing via a crank fixed to the opening/closing shaft, one end of the closing spring has a low friction An operating device for a vacuum breaker, characterized in that: a shaft is supported by the opening/closing shaft through a coefficient bearing.