JPS6153811B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an improvement in a switching switch for an on-load tap changer using a vacuum switch.

[Conventional technology]

One of the methods for operating a vacuum switch used in a switch for a tap changer at the time of load is as follows.
Cam mechanisms are known. FIG. 1 shows the concept of a specific example of a structure conventionally used in this type of device.

In Fig. 1, A is a mounting support frame for the switching switch of the on-load tap changer, 1 is a vacuum switch, 2 is a fixed base for fixing the vacuum switch, and 3 is a drive for the switching switch of the on-load tap changer (not shown). A drive shaft rotated by the device, 4 a cam plate fixed to the drive shaft 3, 5 a fixed base serving as a bearing for the drive shaft 3, 6 a bell crank driven by the cam plate 4, 7 a A crankshaft serving as the center of rotation of the bell crank; 8 a bearing for supporting the crankshaft; 9 a fixed base for fixing the bearing 8; 10 a movable electrode rod fixed to the movable electrode of the vacuum switch 1; , 11 is a driven collar fixed to one end of the movable electrode rod, 12 is a driving collar that applies an opening force to the movable electrode rod 10 by coming into contact with the driven collar 11, and 13 is a driving collar 12 fixed to one end thereof. It is a cylindrical container. 14 is a compression spring enclosed in the cylindrical container 13, and is a contact pressure spring for applying contact force to the movable electrode when the vacuum switch 1 is closed; 15 is a drive rod fixed to the bottom of the cylindrical container 13; 16 is a contact pressure spring; An opening spring is arranged concentrically with the drive rod 15, a collar 17 is fixed to the end of the drive rod 15, and a fixed base 18 serves as a spring holder for the opening spring 16. 1
Reference numeral 9 denotes a stopper with which the bottom of the cylindrical container 13 comes into contact when the movable electrode of the vacuum switch 1 is opened a predetermined distance, thereby sealing the movement of the movable electrode.

In FIG. 1, the vacuum switch 1 is shown in a closed state. In other words, the first one at the bottom of bell crank 6
The end portion of is in contact with a convex portion provided on the cam plate 4,
The upper second end of the bell crank 6 contacts the collar 17, which compresses the opening spring 16 and pushes the drive rod 15 upward in FIG. The contact pressure spring 14 is connected to the driven collar 1
1, the movable electrode rod 10 is pushed upward, and the movable electrode and fixed electrode of the vacuum switch 1 are brought into contact with each other.

When the cam plate 4 is rotated by the drive shaft 3 and the first end of the bell crank 6 comes into contact with the recessed part of the cam plate 4, the bell crank 6 moves in the direction shown by the dashed arrow in FIG. It rotates around the crankshaft 7. Since the collar 17 fixed to one end of the driving rod 15 is driven downward by the opening spring 16, the cylindrical container 13 also moves downward, and when the driving collar 12 comes into contact with the driven collar 11, the movable electrode rod 10 also moves downward. The vacuum switch 1 is driven and starts opening the cylindrical container 13.
The bottom of the contact stopper 19 comes into contact with the stopper 19, and the opening operation is completed.

[Problem that the invention seeks to solve]

Vacuum switches used in switching switches for on-load tap changers are usually used in multiple numbers, and they are opened and closed in sequence at an accurate rotation angle value of the drive shaft, and the vacuum switches are The distance must also be driven accurately to ensure the longevity of the bellows used in the vacuum switch. Therefore, the mounting of the various mechanical elements described above requires accurate mutual angular and dimensional relationships. In particular, fixed base 2,
The mutual dimensional and angular relationship of 9, 18 and stopper 19 is particularly important. Conventionally, as shown in FIG. 1, the fixed bases 2, 9, 18 and the stopper 19 have been constructed so that they can be individually and independently attached to a mounting support frame A of a switching switch for a load tap changer. In such a structure, fine adjustments are required at various places when assembling the fixed bases 2, 9, 18, stopper 19, etc.
It was difficult to work with and was also inferior in reliability. Furthermore, in terms of maintenance, it was not easy to replace parts and required a high level of skill. For example, the known method shown in FIG. 3 of Japanese Patent Publication No. 52-18881 is a modification of the above-mentioned FIG. 1 and has the same drawbacks as the above-mentioned FIG. 1.

[Means for solving problems]

The present invention has been made in order to improve the drawbacks of the above-mentioned conventional methods. Components such as a cam 4 and a bell crank 6 necessary for opening and closing the vacuum switch 1 are attached to the common base plate 20, and a play is provided to transmit rotation even if there is a slight misalignment between the cam 4 and its driving shaft. A fitting puller was provided.

[Effect]

After assembly, adjustments or replacements within the vacuum switch unit can be made without affecting other vacuum switch units.

〔Example〕

An embodiment of the present invention will be explained below with reference to FIG.

In FIG. 2, 20 is a common base for mounting the opening/closing mechanism for each vacuum switch, which is fixed to the support frame or fixed base 5 of the switching switch, and 21 is a common base plate for mounting the opening/closing mechanism for the vacuum switch 1. This is a vacuum switch holding frame for attaching to 20. A camshaft 22 is rotatably supported on the common base plate 20 for attaching the opening/closing mechanism, and is connected to a drive device of a switching switch (not shown) by a loosely fitting coupler. As an example of a loose-fit coupler, in the example shown in FIG. 2, a sliding keyway with ample space is bored in the center hole of the cam plate 4, and a key 29 is fixed to the drive shaft 3, so that the cam plate 4 and the drive shaft 3 can be slid together. The loose attachment allows the power of the rotating shaft 3 to be transmitted to the cam plate 4 even if there is some axial misalignment. In the example shown in FIG. 3, the cam plate 4 is mounted and rotatably supported on the common base 20 in the same way as in FIG. In addition to providing a groove 25 in the direction, one end of the drive shaft 3 is provided with a flat protrusion 31 in the diametrical direction.
is provided, and the protrusion 31 on the flat plate at the end of the drive shaft 3 is loosely fitted into the groove 25 of the cam plate 4, so that the power of the drive shaft 3 is transmitted to the cam plate 4 regardless of some axial misalignment. It was to so. The rest of the structure is the same as that shown in FIG. 1, and the principle of opening and closing of the vacuum switch 1 is also the same as that shown in FIG. 1, so the same parts are given the same reference numerals and detailed explanation will be omitted. Incidentally, in order to attach a plurality of vacuum switches, a plurality of sets having the above-mentioned structure as one unit are mounted, and each common base plate 20 of each set is attached to the mounting support frame A. In one embodiment of the present invention shown in FIG. 2, parts corresponding to the fixed bases 2, 9, 18 and stopper 19 of the conventional vacuum switch in FIG. 1 are integrated into the same mounting common base 20. As long as the machining accuracy of individual parts is maintained sufficiently, there is no need to make any adjustments during assembly.
Helps improve assembly workability and reliability. Also, as in the conventional example shown in FIG. 1, an independent fixed base 5,
When attaching 9 and 18 to a single fixed member such as a mounting support frame, there is no need for wasted space that inevitably occurs due to attachment work and adjustment, which greatly contributes to downsizing of the tap switching device under load. be. In addition, with the above configuration, when maintaining the switching switch, it is possible to replace the entire unit as shown in Figure 2, and there is no need to remove and install small parts, resulting in high reliability. , it has the advantage of requiring very little work time.

By adopting the above configuration shown in Fig. 2 or Fig. 3, the entire unit for each vacuum switch, which consists of the parts excluding the shaft 3 and fixed base 5 shown in Fig. 2, can be used for maintenance of the switching switch. When replacing the camshaft 4 and the drive shaft 3, it is only necessary to separate the camshaft 4 and the drive shaft 3 using the coupler part, and there is no need to remove the drive shaft 3 itself from the gear, etc., so there is no need for troublesome shaft alignment, which is convenient.

FIG. 4 shows an embodiment of the vacuum switch opening/closing mechanism according to the present invention when the vacuum switch is configured to be normally closed. In the figure, 21a is a vacuum switch holding frame provided with at least enough space to not hinder the movement of the bell crank 6 in the vacuum switch holding frame 21, and since the rest is the same as in Fig. 2 etc., repeated explanation will be omitted. .

FIG. 5 shows that in one embodiment of the present invention shown in FIG. 2, when maintenance and inspection of the switching switch is carried out, the vacuum switch can be removed from the common mounting base plate 20 along with its holding frame 21b by simply attaching and detaching the bolts 23. This is another embodiment of the present invention that is configured to be replaceable without the need for position adjustment. The vacuum switch support frame 21b is fitted into a hole drilled at a predetermined accurate position on the common mounting base plate 20 and fixed with bolts 23. The other configurations are the same as those in FIG. 2, so redundant explanation will be omitted. Furthermore, in the embodiment shown in FIG. 5, the vacuum switch support frame 21b does not necessarily have to be positioned by fitting, but the bolt holes for the bolts 23 made in the vacuum switch support frame 21b are drilled with a predetermined accuracy. Needless to say, it may be sufficient if the positioning pins are kept in place or the positioning pins are accurately driven. The configuration shown in Fig. 5 is convenient for removing the vacuum switch and checking its vacuum level when inspecting the changeover switch of the on-load tap changer. This is effective for applications where the vacuum switch needs to be replaced frequently.

〔Effect of the invention〕

As described above, according to the present invention, the loose fitting coupler 2
The drive shaft 3 and the camshaft 22 are connected and separated through the camshafts 9 and 25, and thereby the vacuum switch mounting unit opening/closing mechanism can be attached to a support frame of a switching switch for a tap changer at the time of load. By configuring it on the common mounting base plate 20, it is possible to easily assemble, adjust, and replace the vacuum switch part, and to obtain a highly reliable vacuum switch opening/closing mechanism with improved workability. The effect of enabling miniaturization can be obtained.

The present invention can also be applied to the opening/closing mechanism of other devices similar to the on-load tap switching switch (such as a disconnector or a disconnector).

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram showing the components of the vacuum switch opening/closing mechanism of a conventional on-load tap changer, Fig. 2 is a longitudinal sectional view showing an embodiment of the present invention, and Figs. 3 to 5 are FIG. 7 is a vertical cross-sectional view showing another embodiment of the present invention. In the figure, 1 is the vacuum switch, 4 is the cam plate, 6 is the bell crank, 20 is the opening/closing mechanism common mounting base, 2
1 is a vacuum switch support frame. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. For mounting an opening/closing mechanism provided with a plurality of vacuum switches 1 in a load tap switching device that opens and closes a plurality of vacuum switches at a predetermined time difference based on the drive of one driving shaft. Common base plate 2
0, a vacuum switch 1 fixed to this common base plate 20 via a support frame 21, and the above-mentioned common base plate 2
A bell crank 6 is rotatably mounted on a bearing attached to the base plate 20 and is driven by the bell crank 6. A cam plate 4 that transmits force, and loose fitting couplers 29, 25 that transmit rotation of the driving shaft to the rotating shaft 3 of the cam plate 4.
An on-load tap switching device comprising: 2. The on-load tap switching device according to claim 1, wherein the vacuum switch attachment common support frame 20 is removably fixed to the base plate with a fastening mechanical element such as a bolt.