JPS59207526A - 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 vacuum breaker that has a vacuum valve in the breaker section and that connects to the panel side through a disconnection terminal connected to the vacuum valve. This invention relates to a drawer-type vacuum breaker.

[Prior art and its problems]

With recent technological advances, the external dimensions of vacuum valves have become significantly smaller.
There is a strong demand for the development of a vacuum breaker that is highly safe, compact, and inexpensive.

However, in conventional vacuum breakers of this type, although the vacuum valve has become smaller, the exposed terminals on the fixed contact side and the movable contact side of the vacuum valve have large cooling surfaces. Since it is necessary to hold it firmly and dissipate heat, it not only becomes an obstacle to miniaturization, but also poses a safety problem in terms of insulation.

In particular, the movable contact side has a structure in which the movable contact rod is connected to the external terminal via a flexible conductor, so it is easy to cause temperature rises in this part, so the vicinity of the connection part is closed for heat dissipation. If an attempt is made to increase the size, the movable parts in general become heavier, leading to an increase in the size of the operating device for operating the movable parts.

Furthermore, in order to increase safety, there are vacuum cut-off devices that have a vacuum valve as the main part and the live parts near it housed in an insulating box, or there are some vacuum cut-off devices that have a vacuum valve as the main part and the live parts near it are housed in an insulating box. In order to prevent the temperature from reaching I'Ilj due to heat generation due to energization, the filled viewing portion must be made large.

[Purpose of the invention]

In view of the above-mentioned problems, an object of the present invention is to provide a compact, highly safe, and inexpensive cooling means that suppresses the temperature rise in the vicinity of the connecting portion of a movable contact rod using a cooling means having a lightweight structure. Our goal is to provide vacuum cleaners.

[Key points of the invention]

That is, the present invention provides a vacuum circuit breaker in which a current-carrying part is constructed by connecting a flexible conductor to a movable contact rod of a vacuum valve, and a heat dissipation surface is provided at the connection portion between the movable contact rod and the flexible conductor. A cooling conductor that is thin, lightweight, and has good electrical and thermal conductivity is connected and incorporated into the current-carrying part, and the current-carrying part and the vacuum valve are housed in an insulating box.

[Embodiments of the invention]

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

Fig. 1A and Fig. 1B show an outline of the vacuum breaker of the present invention, where ■ is the operation part of the breaker which is a pull-out type, 2 is the breaker part, and the vacuum valve 3 is attached to the breaker part 2. The disconnect terminal 4 connected to the vacuum 7<lub 3 is provided on the opening side of the insulating box 5. Furthermore, G is an operating lever that transmits the operating force from the operating section l to the breaker section 2.

Note that here, since both the breaker part 2 and the disconnection connection terminal 4 are arranged in parallel according to the Nero point, the interphase iF&d
It is necessary to set appropriately, but in order to make the breaker compact, it is desirable to shorten this interphase #d as much as possible. The interphase distance d is obtained by setting the spatial pressure #d1 between adjacent connection terminals 4 and the width d2 of the connection terminals 4, but according to the present invention,
For reasons described later, the interphase P&d can be set sufficiently short.

2A, 2B and 2C show details of the breaking section 2, where 54 and 5B are support members and vacuum valve handles integrally fixed to the insulating box 5. 3A is a fixed contact side terminal of the vacuum valve 3;
This terminal 3A is firmly attached to the member 5B together with the intermediate conductor 7 with a mounting screw 8, and the intermediate conductor 7
A disconnection connection terminal 4 is fixed with a bolt 9.

3B is a movable contact rod of the vacuum valve 3, the movable contact s3B and the insulating rod lO are connected by a joint member 10A, and the movable contact rod 3B is connected via the insulating rod 10.
can be operated to shut off the vacuum/help 3.

Further, one end of a flexible conductor 11 is fixed to the movable contact bar 3B, and the other end of the flexible conductor 11 is connected to the port 8 while being held between the support member 5A and the disconnection connection terminal 4 on this side. It is fixed by.

15 is attached to the end of the movable contact bar 3B together with the flexible conductor 11.
,! The cooling conductor is secured by fixed screws 16. The cooling conductor 15 is formed by forming a conductive plate such as a thin copper plate by, for example, drawing processing, and in this example, as shown in FIGS. 3A and 3B, it has a rectangular box shape with an opening at the top, and a movable contactor. The current-carrying portion of the cooling conductor 15 that maintains electrical connection with the rod 3B and the flexible conductor 11 is plated with silver, for example, to reduce contact resistance. -The shape of the cooling conductor 15 is not limited to a rectangular shape, but may be a cylindrical shape with an opening at the top surface.By making the shape of the cooling conductor 15 large in surface area, lightweight, and mechanically strong, it can be effectively Not only can it be cooled, but it can also withstand large impact forces at the time of turning on and off and retaining its shape, and the force required to operate the movable part is small, so there is no need to enlarge the operating part 1.

Furthermore, such a cooling conductor 15 is housed in the insulating box 5, but at the same time, the disconnection connection terminal 4 on the movable part side
and the flexible conductor 11 and the connection between the disconnection contact 4 on the fixed contact 3A side and the intermediate conductor 7 are both located inside the insulating box 5 from the edge 5C of the insulating box 5. .

The terminal piece 4A of the disconnection connection terminal 4 is as shown in FIG. 2C.
The tip portions 4B of the terminal pieces 4A are made to face each other and are curved inwardly into an arched shape to provide good contact 1 with the fixed contact 20 on the panel side. Vermiform y small (
As it is given to you.

Furthermore, the terminal piece 4A has a thrift 4 as shown in FIG.
0 and 4E are provided, and the spring holding member 13 fitted with the contact spring 12 is fixed at a predetermined spring installation position via the thrust 4E, and the spring force of this spring 12 causes the tip portion 4B to be fixed. It is pressed toward the contact 20 to maintain sufficient contact pressure.

In the vacuum cutter constructed in this manner, the movable contact rod 3 which becomes the heat source (A) is large due to its high resistance value.
At the connection part between B and the flexible conductor 11, forming part of the current-carrying part,
In addition, by providing the lightweight cooling conductor 15 which has a large heat dissipation area and can obtain a large cooling effect, it is possible to cope with a sufficiently large rated current without increasing the size of the movable part and the operating part 1. In addition, the cooling conductor 15 is placed inside the edge 5C of the insulating box 5 at the connection between the disconnection connection terminal 4 and the flexible conductor 11 and the connection between the disconnection connection terminal 4 and the intermediate conductor 7. By doing so, the insulating properties of the abutment can be maintained, and the insulating properties of the abutment holes can be maintained.
can be shortened to a vacuum breaker (small) (2).

Figures 4A and 4B illustrate another embodiment of the invention.

Reference numeral 25 indicates the cooling conductor, and the cooling conductor 25 in this example has ventilation holes 26 on a part of its side and bottom surface.

That is, by providing such a ventilation hole 28, it is possible to obtain a circulation effect of high temperature air that remains near the connection portion to which the cooling conductor 25 is attached.

〔Effect of the invention〕

As explained above, according to the present invention, a lightweight cooling conductor formed using a good electrical and thermal conductor and having a large surface area is inserted as a current-carrying part at the connection part between the movable contact bar and the flexible conductor. In addition, such a cooling conductor is placed in an insulating box with the disconnection connection terminal side open, along with the connection area between the disconnection connection terminal and the flexible conductor on the movable part side, and the connection area between the disconnection connection terminal and the intermediate conductor on the fixed part side. Because it is housed in a large rated current, it has a high cooling effect, maintains good insulation between the phases, allows the phase distance to be sufficiently shortened, and requires less operating force to operate the moving parts. Therefore, the operation section can be made smaller, and an inexpensive and smaller vacuum breaker can be obtained.

[Brief explanation of drawings]

1A and 1B are a side view and a top view, respectively, showing an outline of the vacuum breaker of the present invention as an example, 2A is a front view showing details of the breaker, and 2B is a 2A
2C is a partial sectional view taken along line BB in FIG. 2B, and FIGS. 3A and 3B are two-sided views showing the shape of the cooling conductor as an example. 4A and 4B are a top view and a side view, respectively, showing, as an example, the shape of a cooling conductor according to another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Operation part, 2... Shutoff part, 3... Vacuum valve, 3A... Fixed contact side terminal, 3B... Movable contact bar, 4... Disconnection connection terminal, 4A. ...Terminal piece, 4B...Tip, 4D, 4E...Slit, 5...Insulation box, 5A...Supporting member, 5B...Mounting member, 5C...Edge, 6 ...Operation lever. 7... Intermediate conductor, 8... Mounting screw, 8... Bolt, 10... Insulating iron, 10A... Joint member, 11... Flexible conductor, 12... Spring, 13... ...Spring holding member, 15...Cooling conductor, 20...Contactor, 25...Cooling conductor, 26...Vent hole. Patent applicant Fuji Electric Manufacturing Co., Ltd.

Claims (1)

[Claims] In a vacuum breaker in which a current-carrying part is constructed by connecting a flexible conductor to a movable contact bar of a vacuum/relevant, a thin, lightweight, heat-radiating surface is provided at the connection part between the movable contact bar and the flexible conductor. A vacuum breaker characterized in that a cooling conductor that is a good electrical and thermal conductor is connected and assembled in the current-carrying part, and the current-carrying part and the vacuum valve are housed in an insulating box with one side open.