JPH01315115A - Energy-storage apparatus of on-load tap changer - Google Patents

Abstract

PURPOSE:To reduce a loss to be caused at a sliding part, to make a mechanical life longer and to enhance the reliability of a changeover switch by a method wherein the transmission of an action of a driving force coincides with a line of action of a load. CONSTITUTION:Rectlinear guide bearings are installed at both ends of both a winding-up case 2 and an energy-storage case 4 in a direction coinciding with a direction of a forward and backward motion; they mutually guide the forward and backward motion of both. One-side linear guides 21 acting as slide-type sliding parts of the winding-up case 2 and the energy-storage case 4 from an eccentric plate 7, both-side linear guides 22, positions acting as points of application of loads such as the shaft center of an energy-storage spring 3 and the like perform an identical action and are slid in positions where they coincide with each other. By this setup, since an excessive stress is not caused in the sliding parts, a loss is reduced, a mechanical life is made longer and the reliability of a switching operation can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION (Field of Industrial Application) The present invention relates to an improved energy storage device for an on-load tap changer.

(Prior Art) In general, an on-load tap switching device is required to have a function of rapidly switching a movable contact from a fixed contact connected to odd-numbered taps to a fixed contact connected to even-numbered taps. The fast-acting function of this movable contact is provided by an energy storage device associated with its drive shaft.

A conventional energy storage device is disclosed in Japanese Patent Publication No. 52-471.31, for example. This energy storage device is shown in Figure 5 (
As shown in A) and (B), the winding case 2. Reserve case 4
and a storage spring 3, which are attached to a mounting plate 9.
The spring guide shaft 1 and the energy storage case guide shaft 5 are movably inserted into the spring guide shaft 1 and the energy storage case guide shaft 5, which are installed in the spring guide shaft 1 and the energy storage case guide shaft 5, respectively.

As can be seen from FIG. 5, in this energy storage device, the rotation of the drive shaft 6 causes the eccentric plate 7 to rotate, so that the energy storage spring 3 is stored as the hoisting case 2 moves to the left or right. Ru. When the storage force of this energy storage spring 3 reaches its maximum value, the catch of the energy storage case 4 is released and the energy storage spring 3 is released. Move rapidly to the side. By this movement of the energy storage case 4, the switching crank 12 is rotated to perform a switching operation of a switching switch (not shown).

(Problem to be Solved by the Invention) However, in this conventional energy storage device, the operating position of the driving force transmitted from the eccentric plate 7 to which the drive shaft 6 is fixed to the hoisting case 2 is supported by the mounting plate 9. Spring guide shaft 1
, and the position where the action occurs in an angular direction from the sliding direction of the winding case 2 along the case guide shaft 5, stress that causes deformation of the winding case 2 is generated, and the winding case 2, the spring guide shaft 1, and the sliding portion between the case guide shaft 5 have stress that causes loss,
There is a risk that the switching operation of the switching switch will be hindered.

Moreover, as the storage capacity increases and the storage force increases, the spring force of the storage spring 3 becomes stronger, and the hoisting case 2
The stress causing deformation of the spring guide shaft 1 increases.
Since the frictional force between the spring receivers 8 also increases, the loss in the switching operation is further increased.

The above phenomenon indicates a power storage device of an oil-insulated load tap changer, but if this is a non-lubricated type such as a gas insulation system, the storage force increases and each sliding part of,
The frictional force will increase, and the switching operation of the switching switch will become impossible, and there is a risk that the material strength will reach its limit and breakage may occur. These problems can be solved by strengthening and reinforcing the structure and using reinforced materials to deal with the increase in stress that causes deformation of the winding case 2. No sliding of bearings etc. due to the wear phenomenon of each sliding part! JJ products and abrasion resistant materials have been incorporated to cope with this problem, but with such a configuration, it is necessary to increase the size of the energy storage device, and it is also economically disadvantageous.

The present invention has been made in consideration of the above points, and its purpose is to reduce loss occurring in sliding parts and extend mechanical life by creating a structure that does not generate excess stress. An object of the present invention is to provide a power storage device for a load tap changer that is compact and has improved reliability through reliable operation of a changeover switch.

[Structure of the invention]

(Means for Solving the Problem) The energy storage device of the on-load tap changer according to the present invention is fixed to the upper part of the support by receiving the driving force from the drive mechanism of the on-load tap changer. A winding case that slides freely on one side of the linear guide for both sides via a linear guide for one side, and a linear guide for both sides that is fixed to the upper part of the support opposite to the linear guide for the winding case. On the other side, a power storage case that slides freely is disposed via a linear guide for one side, and this power storage case has a switching crank that converts the sliding force into a switching force for the switching switch. , the energy storage spring is sandwiched and housed between the energy storage case and the winding case, and has spring receivers at both ends that abut against the energy storage case and the winding case, respectively, and has a load tap. By aligning the lines of action of all the loads on the sliding part and the energy storage operation part from the drive mechanism force of the switching device, and by configuring it to double as a guide that serves as the sliding part of the hoisting case and the energy storage case, By not creating extra stress on the sliding parts, loss can be reduced, mechanical life can be extended, and reliability of switching operation of the switching switch can be improved.

By adopting such a configuration, it can be made simple and compact, and the cost can be reduced.

(Embodiments) Hereinafter, embodiments of the present invention shown in FIG. 1 and FIGS. 2A, B, and C will be described. The energy storage device according to the present invention can also be roughly divided into 1 winding case 2, energy storage case 4. and a storage spring 3. A sliding part 2a in which an eccentric plate 7 integrated with a drive shaft 6 is fixed to a hole in a winding case 2.
is inserted into. Further, end plates 31 are provided on both sides of the winding case 2, and a protruding tripping claw 11 is provided on one side of the winding case 2. The end plates 31 are each provided with an insertion hole 31a in a protruding portion.

In addition, the spring guide shaft 1 is passed through a storage spring 3 consisting of a compression spring provided with spring receivers 8 at both ends, and one side of the spring receivers 8 is fitted into the insertion hole 31a, and the spring guide shaft 1 is inserted into the compression spring provided with the spring receivers 8. Become. Two spring guide shafts 1 are respectively arranged in two insertion holes 31a so that the energy storage spring 3 is arranged inside the winding case 2. Although only one of the spring guide shafts 1 is shown in the drawing, the ends of the two spring guide shafts 1 are fixed to mounting plates 9 provided on both sides at fixed portions 9a. This winding case 2 has a one-sided linear guide 21 attached to the side surface along the sliding direction. The linear guide for one side, which becomes a sliding part during the energy storage operation of the winding case 2, is formed in combination with the linear guide for both sides fixed to the support 23 as a counterpart.

On the other hand, in the storage case 4, a linear guide 21 for one side is similarly fixed to the storage case 4, facing the linear guide 21 for one side of the winding case 2, via a linear guide 22 for both sides.

Further, at both ends of the storage case 4 along the sliding direction, notches 32 are formed to match the shape of the end plate 31 so that the end plate 31 of the winding case 2 passes through during movement. Furthermore, a switching crank 12 is provided outside the bottom of the energy storage case 4 . The above-described axial center position of the energy storage spring 3 and the linear guide for one side and the linear guide for both sides are arranged so that the lines of action of their loads coincide.

Next, the operation of the present invention constructed as described above will be explained with reference to FIGS. 2A, B, and C, and FIGS. 3 and 4, respectively.

When the eccentric plate 7 fixed to the drive shaft 6 rotates in the direction shown by the arrow in response to a driving force from a drive mechanism (not shown in FIG. 2), it pushes the sliding part 2a and displaces the upper case 2 in the direction of the arrow F. I'll let you do it. At this time, since the energy storage case 4 is fixed by a stopper (not shown), the energy storage spring 3 is
gradually compressed. FIG. 3 shows a state in which the hoisting case 2 has been displaced to a position where the amount of compression of the energy storage spring 3 is close to the maximum value. When the hoisting case 2 is displaced from this state to the position where the amount of compression of the energy storage spring 3 is maximum,
A catch (not shown) is pulled off by a tripping claw 11 of the winding case 2, and the energy storage spring 3 is released. By releasing the energy storage spring, the energy storage case 4 is instantly displaced in the direction of arrow F. At this time, by rotating the switching crank 12 connected to the energy storage case 4, the energy storage release operation at the start of driving the switching switch shown in FIG. 4 is completed.

In the process of this energy storage operation, one side linear guide 21, which serves as a sliding portion of the hoisting case 2 and the energy storage case 4, is moved from the eccentric plate 7. Both linear guides 22 and the hoisting case 2 are designed to slide in the same position where the load is applied, such as the axis of the energy storage spring 3. By using a structure that also serves as a guide that serves as the sliding part of the energy storage case, it reduces loss and lengthens the mechanical life by preventing excess stress from occurring in the sliding part, increasing the reliability of switching operation. By improving the performance and having such a configuration, it can be made simple and compact.

〔Effect of the invention〕

As described above, according to the present invention, the action and transmission of the driving force in the above-described process is carried out between the eccentric plate 7° and the one-sided linear guide 21. By matching the lines of action of the loads, which are the sliding directions of the both-side linear guides 22 and the spring guide shaft 1, an effect that leads to a reduction in energy loss in the sliding parts can be obtained. Furthermore, since there is less energy loss due to stress, the switching reliability of the switching switch is improved and its mechanical life can be extended.

[Brief explanation of the drawing]

FIG. 1 is a developed view showing an embodiment of the energy storage device of the load tap changer according to the present invention, and FIG. B and C are a plan view showing the starting position state of the energy accumulating device of the present invention during energy accumulating operation;
3A and B are a plan view showing the intermediate state of the energy storage operation and a sectional view taken along line EE of A; FIGS. 4A and B are plan views showing the final state of the energy storage operation, and E of A. -E sectional view and FIGS. 5A and 5B are a plan view and a front view of a conventional energy storage device. 1... Spring guide shaft 2... Winding case 2a.
...Sliding part 3...Energy storage spring 4...Energy storage case 5...Case guide shaft 6...Drive shaft 7...Eccentric plate 8...Spring receiver 9...Mounting plate 9a...Fixed part
11...Tripping claw 12...Switching crank 21...Linear guide for one side 22...Linear guide for both sides 23...Support 31...End plate 31a
...Insertion hole 32...Notch agent Patent attorney Rule Ken Chika Yudo Ken Daishimaru Figure 1 (A) Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] A winding case in which an eccentric plate is directly connected to the drive shaft, and a storage force is stored in a storage spring by the eccentric reciprocating movement of the eccentric plate, and a storage case in which the reciprocating movement is performed by the releasing force of the storage spring. In the energy storage device for the on-load tap changer configured, linear guide bearings are provided at both ends of both the winding case and the energy storage case in a direction that coincides with the reciprocating movement direction, and the reciprocating movement of both is mutually guided. In addition, the center line of this bearing is aligned with the load action line of the eccentric plate and the energy storage spring, thereby minimizing loss during energy storage and release operations. force device.