JPS6342407Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to a contact device used in a tap selector for an on-load tap changer or a non-voltage tap changer.

Technical background of the invention In recent years, as transformers have become larger in capacity and have larger currents and higher voltages, there has been a demand for compact and highly reliable contact devices with large current ratings. Conventionally, as this type of contact device, one having a structure as shown in FIG. 1 has been generally used. That is, a fixed contact 1 and a current collecting contact 2 having half-surface contact portions, movable contacts 3a and 3b forming a pair so as to bridge these and sandwich them from above and below, and a pin 4.
A spring 5 that presses the movable contacts 3a, 3b via
a, 5b.

Problems with the Background Art In order to use a contact device with such a configuration for large currents, it is necessary to widen the current-carrying contact range.
In other words, it is necessary to increase the width of the fixed contact 1 and the movable contacts 3a, 3b, and furthermore, in order to ensure a commensurate contact force, the force of the springs 5a, 5b must be increased. As a result, a large driving force is required to move the contact device, making it difficult to obtain a compact contact device. Furthermore, since sliding with a large contact force applied increases wear on each contact, there is concern that metal powder generated thereby may have an adverse effect on the internal insulation of the transformer. On the other hand, since the contact part is made flat, the movable contact 3 with respect to the fixed contact 1
The stop positions of a and 3b tend to vary because the influence of the movement of the drive device is directly transmitted, making it difficult to manage the regular stop positions.

As described above, the conventional contact devices are not necessarily satisfactory in terms of reliability and economy, and there are points that should be improved.

Purpose of the invention The purpose of the invention is to solve these problems,
The object of the present invention is to provide an economical and compact contact device suitable for large currents.

Summary of the invention In order to achieve the above object, the present invention has a fixed contact and a current collecting contact, which have a circular cross section and are spaced apart from each other and are arranged with their axial directions differing by approximately 90 degrees.
In a contact device in which at least two movable contacts facing each other sandwich and bridge, a flat plate material is formed into a U-shape with parallel straight parts and a circular arc part formed in the middle, and the circular arc Fold it further to form semicircular parts on both sides of the part,
The parallel plate members forming the straight line portion and the circular arc portion are respectively arranged to be orthogonal to the axial direction of the current collecting contact and the fixed contact, and as a whole, the axial direction of the fixed contact and the circular arc portion and It is arranged so that the longitudinal direction of the parallel linear parts is along the same direction, and the axial direction of the current collecting contact is orthogonal to the longitudinal direction of the circular arc part and the parallel straight part, and at least the circular arc A movable contact is constructed by providing a V-groove in a portion of the contact portion that contacts the fixed contact, and providing portions on both sides of the groove that ride on the fixed contact.

Embodiment of the invention An embodiment of the invention will be described below with reference to the drawings. In FIGS. 2 to 4, a current collecting contact 6 and a fixed contact 7, both of which have circular cross sections, are arranged facing each other, and a pair of movable contacts 8a and 8b are provided to sandwich them from above and below to collect the current. The electric contact 6 and the fixed contact 7 are bridged. The movable contacts 8a and 8b are made by bending a flat plate material into a U-shape and further forming semicircular parts on both sides of the U-shaped part, and connecting both ends of the plate material (parallel straight parts) and the The U-shaped portions (circular arc portions) are arranged perpendicularly to the axial directions of the current collecting contact 6 and the fixed contact 7, respectively. As a whole, the axial direction of the fixed contact 7 and the longitudinal direction of the movable contacts 8a, 8b are aligned in the same direction, and the axial direction of the current collecting contact 6 and the longitudinal direction of the movable contacts 8a, 8 are aligned.
It is arranged so that the longitudinal direction of b is perpendicular to the longitudinal direction of b. V grooves 9a and 9b are provided in the center of the flat plate of the U-shaped part (arc part) of the movable contacts 8a and 8b that contact the fixed contact 7, and furthermore, V grooves 9a and 9b are provided on both sides of the V grooves 9a and 9b, respectively, to connect to the fixed contact 7. Riding parts 10a and 10b are provided. On the other hand, a movable contact 8a that contacts the current collecting contact 6,
There are also V grooves 1 on both ends of the plate material (parallel straight parts) of 8b.
1a and 11b are provided. Each movable contact 8a, 8b is provided with a spring receiving part 12 in the U-shaped part (arc part) so as to span between the semicircular parts, and also provided with spring receiving parts 13 at both ends (parallel straight parts). The pair of movable contacts 8a and 8b are housed in a case 14 made of a metal plate or an insulator, and a spring 1 is placed between the case 14 and each spring receiver 12 and 13.
5, 16 are interposed. Case 14 is current collector contact 6
Openings 14a and 1 are provided on the side and the fixed contact 7 side, respectively, through which the current collecting contact 6 and the fixed contact 7 can move laterally.
4b. In a contact device having such a structure, when the movable contacts 8a and 8b move to the adjacent fixed contact 7, when the case 14 is moved laterally as shown by the arrow by a driver (not shown),
As shown in FIG. 3, first, the riding parts 10a and 10b of each movable contact 8a and 8b hit the fixed contact 7',
The pair of movable contacts 8a and 8b are pushed apart by the fixed contact 7. Furthermore, the movable contact 8a,
8b moves and the fixed contact 7' moves to the V-groove portions 9a, 9b.
When the contact reaches the position where it is applied, the slopes of the V-grooves 9a and 9b slide on the outer periphery of the fixed contact 7' due to the pressing force of the spring 15, thereby maintaining the normal contact state as shown in FIG.

However, in the contact device constructed as described above, the movable contacts 8a, 8b of the desired shape can be obtained by simply punching and bending the plate material, and by bending the plate material into a U shape, the current can be divided into two. The current is shunted, and the same effect as when two pairs of conventional movable contacts are arranged is obtained, and the current passing through the plate material is relatively small, so the ability to use a relatively thin plate material also helps facilitate processing. Further, whereas the conventional movable contacts have planes arranged in the horizontal direction, the planes of the movable contacts 8a and 8b are arranged in the vertical direction, which increases the heat dissipation effect and leads to an improvement in current carrying capacity. Furthermore, the V-grooves 9a, 9b provided in the portions of the movable contacts 8a, 8b that contact the fixed contact 7 make it easy to obtain a normal contact state, and the V-grooves 11a, 11b provided in the portions of the movable contacts 8a, 8b that contact the current collector contact 6. This can prevent the movable contacts 8a, 8b from moving in the axial direction of the fixed contact 7. However, if the structure is such that this movement is prevented by other means, the V grooves 11a and 11b may not be provided.
Further, semicircular portions are provided on both sides of the U-shaped portions of the movable contacts 8a and 8b in order to improve the electric field condition with respect to other electrodes, and the semicircular portions are not necessarily required.

Next, other embodiments of the present invention will be described.

If a large current carrying capacity is required, this can be achieved by stacking multiple movable contacts 8a and 8b as shown in Figure 5, resulting in a more compact structure compared to the conventional method of arranging planar movable contacts horizontally. Become.

In addition, if you want to balance the contact conditions between the fixed contact 7 side of the movable contacts 8a and 8b and the current collector contact 6 side, as shown in Fig. 6, bend the plate material into a U-shape and further bend the entire plate into an L-shape. If the movable contacts 18 and 19 are bent to face each other, and each U-shaped part is arranged in the axial direction of the fixed contact 7, the number of contact parts of the movable contacts 18 and 19 will be Since it is the same on the fixed contact 7 side and the movable contact 6 side, the contact conditions can be balanced and the surface pressure per contact point can be lowered, so that wear can be reduced. Furthermore, fixed contact 7 and movable contact 6
If you want to reduce the wear on the contact point, use the movable contact 20 with a meandering part in the U-shaped part as shown in Figure 7, and make the meandering part come into contact with the fixed contact 7 to reduce the surface pressure per contact point. This reduces wear and tear.

Effects of the Invention As explained above, according to the present invention, the plate material can be
Since the movable contact is formed by bending it into a letter shape, it is possible to provide a contact device that is easy and economical to process, is compact, and is suitable for large currents.

[Brief explanation of the drawing]

Figures 1a and 1b show a conventional contact device, where a is a sectional view, b is a sectional view taken along the - line of a, and the second
The figure is a perspective view of the contact device according to the present invention, FIGS. 3 and 4 are front views seen from the fixed contact side for explaining the operation of the contact device according to the present invention, and FIG.
7 to 7 are plan views showing other embodiments of the invention. 6... Current collector contact, 7... Fixed contact, 8a, 8
b, 18, 19, 20...Movable contact, 9a, 9
b, 11a, 11b...V groove, 10a, 10b...
...Ripping part, 12, 13... Spring receiving part, 14
...Case, 14a, 14b...Opening, 15,
16...Spring.

Claims (1)

[Scope of utility model registration request] A contact device in which at least two movable contacts facing each other sandwich and bridge a stationary contact and a current collecting contact, which have a circular cross section and are spaced apart from each other with their axial directions differing by approximately 90 degrees. In this step, a flat plate material is bent to form a U-shape with parallel straight parts and a circular arc part formed in between, and semicircular parts are further formed on both sides of the circular part, and the parallel Plates forming a straight line portion and a circular arc portion are arranged perpendicularly to the axial direction of the current collecting contact and the fixed contact, respectively, and as a whole, the axial direction of the fixed contact, the circular arc portion, and the parallel The axial direction of the current collecting contact is orthogonal to the longitudinal direction of the arcuate portion and the parallel linear portion, and at least the longitudinal direction of the arcuate portion is arranged in the same direction. A contact device characterized in that a V-groove is provided in a portion that comes into contact with the fixed contact, and a movable contact is configured by providing a V-groove on both sides of the groove that rides on the fixed contact.