JPS59207525A - 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] [Technical field to which the invention pertains] The present invention relates to a vacuum breaker, and particularly to a drawer type vacuum breaker that has a vacuum valve in the breaker section and is connected to the panel side through a disconnection connection terminal connected to the vacuum valve. Regarding air breaker.

[Prior art and its problems]

Vacuum valves used in vacuum circuit breakers utilize the extremely high electrical dielectric strength in vacuum and the remarkable arc-extinguishing effect when the circuit is broken in vacuum to control current in a high-vacuum container. Such vacuum valves have also been significantly miniaturized with the advancement of technology in recent years. There is a strong demand for the development of a vacuum breaker that is small and inexpensive.

However, in conventional vacuum breakers of this type, even though the vacuum valve has become smaller, the terminals exposed to the outside on the fixed contact side and the movable contact side of the vacuum valve have a large rated current. In order to guarantee the cooling effect, it is necessary to maintain a large cooling area, which results in the formation of large exposed live parts, but in this way, the heat generated in the vacuum valve is increased ( If heat is dissipated from one exposed live part, it is not only difficult to downsize the vacuum breaker, but also the insulation safety is reduced.

Therefore, in order to improve insulation safety, it may be possible to cover the vacuum bulb and its exposed live parts with an insulating material, but such a measure would result in an increase in the temperature of this part. A method has been adopted in which the live parts are partially exposed. However, even with this type of system, there are still safety problems.

[Purpose of the invention]

In view of the above-mentioned problems, an object of the present invention is to house the connection part near the terminal of a vacuum valve in an insulating box, and to make the disconnection connection terminal connected to an external circuit into an exposed live part so that heat can be easily dissipated. The purpose of the present invention is to provide a vacuum breaker that is small and highly safe.

[Key points of the invention]

That is, the present invention has a plurality of breaker sections in which disconnection connection terminals are vertically arranged, each of which is connected to a fixed contact and a movable contact of a vacuum valve via an intermediate conductor. In a vacuum breaker where an electrical connection is made between the ends, the disconnection connection terminal is a rectangular terminal with opposing vertical contact surfaces, and the connection part of the rectangular terminal with the intermediate conductor is connected together with the vacuum valve to the breaker part. It is characterized by being housed in an insulating box provided for each.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail based on the drawings.

1A and 1B show an outline of the vacuum breaker of the present invention, where l is a pull-out type breaker operation part, 2 is a breaker part, and a breaker 81 (2 has a vacuum valve 3 attached to it). A disconnect terminal 4 connected to the vacuum valve 3 is provided on the opening side of the insulating box 5. Furthermore, a disconnect terminal 4 is provided on the opening side of the insulating box 5 to cut off the operating force obtained from the operating section 1. This is an operating lever that transmits information to section 2.

Note that here, since both the breaker part 2 and the disconnection connection terminal 4 are arranged in parallel according to the phase connections, it is necessary to appropriately set the interphase distance #d, but the breaker is made compact. It is desirable to shorten this mutual distance d as much as possible. The interphase distance d is obtained by setting the dimensions of the spatial distance d1 between adjacent connection terminals 4 and the width d2 of the connection terminals 4, but according to the present invention, the interphase distance d is It can be set short enough.

2A, 2B and 2C show the details of the breaking section 2, where 5A and 5B are support members and vacuum valve mounting members integrally fixed to the insulating box 5. 3A is a fixed contact side terminal of the vacuum valve 3;
This terminal 3A is firmly fixed to the member 5B together with the intermediate conductor 7 with a mounting screw 8, and furthermore, the intermediate conductor 7 is attached to the valve member 5B.
The disconnection connection terminal 4 is fixed by the port 8.

3B is a movable contact rod of the vacuum valve 3, the movable contact rod 3B and the insulating rod 10 are connected by a joint member 10A, and the movable contact rod 3B is connected via the insulating rod 10.
can be operated to cause the vacuum valve 3 to shut off.

Furthermore, the movable contact bar 3B has a high-strength s
+ established, and the other end of the flexible conductor 11 is supported + * Sound R
A guard is inserted between the material 5A and the disconnection connection terminal 4 on this side, and it is fixed with a bolt 9 using a bolt 43.

In addition, here, the disconnection connection terminal 4 and the flexible conductor 1 on this side
1 and the disconnection of the fixed contact 3A and the disconnection of the terminal 4 and the intermediate conductor? The connection part is set so that the connection part is located on the inner side of the insulating box 5 from the edge 5C of the insulating box 5.

Furthermore, here, the disconnection connection terminal 4's stand high Kozuki-4A4 lie No. 2
As shown in Fig. C, the ends of the terminal pieces 4A facing each other are
If the bow shape is curved inward, the tip name is 5.
A protrusion 4C is provided on the inside of 4B to maintain a good contact state force ζ with the fixed disconnection contact S 20 of the panel 1j. I'm going to take care of it so that I can get it.

Furthermore, the white of the terminal piece 4A]
Sound b4B and the part following it are provided with slits 4D and 4E in FIG. 13 is fixed at a predetermined position 1ζ1□, and the spring force of this spring 12 brings the protrusion 4c of the tip 4B into contact with the contact 20, and maintains sufficient contact pressure between them. There is.

In addition, in FIG. 2C, the holding distance W between the protruding parts 4c at the tip part 4B is generally set in relation to the plate thickness of the contactor 2o on the panel side having a knife edge, but in the normal case, the holding distance W is 4. - In order to fix the terminal piece 4A to the breaking part 2 side, a space width W for tightening the bolt 8 is required at the fixing flange part as shown in Fig. 2c.
must be sufficient, and the dimension w2 must be larger than the vital dimension W1.

However, according to the present invention, as shown in FIG. 3, if the axial center position 8A of the bolt 8 is the symmetrical upper and lower terminal pieces 4A separated by the slit 4E, it is located at the center where the left and right terminal pieces 4A can be seen. It's like coming. Note that the contact spring 12 and the spring holding member 13 are shown attached between the terminal pieces 4A in the third IN, but these spring devices 6 hold the terminal pieces 4A to the side of the cutting part 2. After fixing with Holt 9, I can say a few phrases.

When inserting a tool into the head of the bolt (not shown) from the south end of the terminal piece 4A, center on position 8A, Since it is possible to work with the imaginary circle 30 having a larger diameter as the limit, it is possible to reduce the space 1lliIIW2 to correspond to the size of the imaginary circle 30, and the outside of the connecting terminal 4 shown in FIG. 1B can be reduced. The normal dimension d2 can be set sufficiently small.

In particular, in this example, since the slits 4D and 4E are provided to separate the terminal pieces 4A evenly in the negative direction, the respective ports 9 can be easily secured by tightening the terminal pieces 1 to 1F.

Furthermore, in this example, since the terminal pieces 4A are rectangular and arranged in the first direction, the convection of air can be promoted and the effect of reducing the exposed live parts can be enhanced.

Note that the flexible conductor 11 and the intermediate conductor 7, which form the upper air connection between the disconnection connection terminal 4 and the vacuum/help 3 side, are formed in a rectangular shape and are areas with a large degree of electric field concentration. Although it is necessary to maintain a distance between the contacts in this part, in this example, such a connection part is configured to be stored in the insulating box 5, and the contacts are isolated by the side wall of the insulating box 5. Therefore, it is not only possible to set the phase interval 1? This can be done to enhance the cooling effect.

〔Effect of the invention〕

As explained above, according to the present invention, the terminal piece of the disconnection connection terminal that maintains contact with the panel side is formed by a U-shaped terminal plate with a wing blade type, and the direction of the terminal 41 is in the vertical direction. Since contact is maintained only on the sides of the plate, the contact resistance is reduced, which not only reduces heat dissipation but also increases the cooling effect due to the convection effect.
<Since the connection part with the lubricant is surrounded by the wall of the insulating box, the connection part (1) can be set on the top without the risk of mutual arcing, and cooling can be obtained, and the distance between the phases can be made sufficiently small. <Installation system: Can be made small and inexpensive, can insulation be as safe?
It is also possible to use a larger JI rated current.

[Brief explanation of the drawing]

1A and 18 are a side view and a side view, respectively, showing an outline of the vacuum shredder of the present invention as an example, and FIG.
The figure is a top view showing the details of the first section.
Figure B is a cross-sectional view of A-APa (Figure 2A), Figure 2C is a cross-sectional view of Figure 2
A partial sectional view seen from 5-B43z in Figure B, Figure 3 is the 2nd
This is a 11-plane view of the disconnection connection terminal in Figure B when viewed from direction C. 1... Operating section, 2... Shutoff section, 3... Vacuum valve, 3A... - Fixed contact side terminal, 13B... Sliding contact cup, 4... Disconnection connection terminal, 4A... Terminal piece, 4B... Tip, 4G... Protrusion 8 [(, 4D, 4E...Slit, 5...Insulation box. 5A...Supporting member, 5B...Mounting member, 5C...Edge. 6...Operation lever, 7...Intermediate conductor, 8 ...Mounting screw, 9...Polyre!, 8A...Center position, 1O...Insulation iron, 10A...Joint member, 11...Flexible conductor, 12...Spring, 13... Spring holding member, 20... Fixed disconnection contact, 30... Temporary grip circle.

Claims (1)

[Claims] It has a plurality of vacuum valves in which disconnection connection terminals are vertically arranged, each connected to a fixed contact and a movable contact through an intermediate conductor, and electrical connection between the disconnection connection terminal and an external circuit disconnection connection end is provided. In the vacuum breaker to which the connection is made, the disconnection connection terminal is a rectangular terminal having opposing vertical contact surfaces, and the connection portion of the rectangular terminal with the intermediate conductor is located at a stepped position, respectively, together with the vacuum valve. A vacuum interrupter characterized in that it is housed in an insulating box with an open side.