JPS638043Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a vacuum switchgear.

FIG. 1 and FIG. 2 show a conventional vacuum switchgear, and this vacuum switchgear is constructed as follows.
In FIGS. 1 and 2, the fully molded insulating frame 1 has a box-like configuration with only the front side open and the other five sides closed, with a top wall 1a and left and right side walls 1.
b, 1b, a back wall 1c and a bottom wall 1d,
A metal leg 2 is attached under the bottom wall 1d. The legs 2 are fixed with bolts 3, 3 passed through four bolt insertion grooves provided on the front, rear, left and right sides of the bottom wall 1d. In the full mold insulation frame 1, in the upper part where the contact mechanism including the vacuum interrupter 4 is disposed, there are two vertical interphase barriers 1e, 1e connecting the top wall 1a and the back wall 1c, which are sufficient for interphase insulation. The rib 1f is formed at a lower position and continues to a rib 1f that projects horizontally from the inner surface of the rear wall 1c. The top wall 1a and the back wall 1c are the left and right side walls 1.
Vertical and horizontal reinforcing ribs 1g, 1h, and 1i are integrally formed on the outer surfaces of the top wall 1a and the back wall 1c. The rear wall 1c is configured to have necessary structural strength.

The vacuum interrupter 4 is connected to the main circuit upper terminal 5 with its fixed lead rod inserted into a hole 6 previously provided in the upper wall 1a of the entire mold insulating frame 1, so that the main circuit upper terminal 5 is connected to the upper surface of the mold insulation frame 1. It is placed on the wall 1a and fixed with bolts 7, 7 and nuts 8, 8, and is attached to the upper wall 1a. The bolts 7, 7 pass through bolt holes 9, 9 that are previously provided through the top wall 1a, but the bolt heads are sunk into shallow locking grooves 10, 10 formed on the inner surface of the top wall 1a. There is.

In addition, the main circuit lower terminal 11 is located at a predetermined position on the rear wall 1c of the all-molded insulating frame 1, and has a nut mounting pocket 12 (a square hole that also serves as a lock for the nut) that opens on the outer surface side (right side in FIG. 2). established,
A bolt insertion groove 13 is provided which communicates the through hole (not shown) of the main circuit lower terminal 11 with the nut mounting pocket 12. The main circuit lower terminal 11 has a shallow groove-shaped stopper 14 that holds it.
The locking portion 14a of this stopper fitting 14 is
are pressed down so as to engage with the lower part of the wall forming the nut mounting pocket 12, and the bolt 15 inserted into the bolt insertion groove 13 is turned through them and fastened to the nut 16 in the nut mounting pocket 12. It is fixed by this and attached to the rear wall 1c. The bolt 15 is installed by temporarily tightening the nut 16 on the bolt 15 passed through the stopper 14 and the main circuit lower terminal 11, inserting the shaft of the bolt 15 into the bolt insertion groove 13, and then inserting the nut 6 into the bolt insertion groove 13. This can be done easily by inserting each into the nut mounting pocket 12 and turning the bolt 15 in this order.

The movable lead rod 4a of the vacuum interrupter 4 is connected to the main circuit lower terminal 11 via a current-carrying nut 17 and a lead wire 18. The movable lead rod 4a
is also connected to an electromagnetic operating mechanism section 22 via an adjustment rod 9, an insulating rod 20, and a pressure contact spring 21. This electromagnetic operation mechanism section 22 includes an operation electromagnet 22
a, a control lever 22b, a movable iron piece 22c connected to the control lever 22b, a shear spring 22d, and a stopper piece 22e.

As mentioned above, the vacuum interrupter used in conventional vacuum switchgear is configured so that the interrupter itself can ensure insulation strength, so the weak insulating material (glass, ceramics) should have sufficient insulation strength on its own. The size of the interrupter itself is large, and those with high voltage are even larger in size.The insulating frame must be made larger due to the need to increase the mounting strength and to take into account interphase insulation. Must be. Therefore, there is a risk that the entire device will become larger.

In addition, conventional interrupters are usually formed in a cylindrical shape, with both end plates made of metal and the middle part made of a long cylindrical insulator. The dimensions must maintain insulation creepage distance that can withstand the voltage between both electrodes, that is, both end plates.The shape of the vacuum interrupter is vertically long, and since the switchgear is configured with the vacuum interrupter in a vertically long state, height increases.

This invention was made in view of the above circumstances, and the purpose is to provide a vacuum switchgear that uses a metal cup type vacuum interrupter to reduce the size of the device and improve insulation strength.

An embodiment of this invention will be described below with reference to the drawings.

In FIG. 3, the same parts as in FIGS. 1 and 2 are designated by the same reference numerals. 31 is a metal cup type vacuum interrupter, and this metal cup type vacuum interrupter 31 consists of a cup-shaped container 31b made of metal, and an insulating end plate (ceramic end plate) 34 that covers the opening of this container.
A vacuum container is formed with the metal cup facing down, and the lead rod 3 is airtightly fixed to the ceiling of the metal cup.
1c is provided, and a movable lead rod 31a facing the fixed lead rod 31c is hermetically penetrated through the insulating end plate 34 via a bellows 31d to constitute a vacuum interrupter. The metal cup type vacuum interrupter 31 has its fixed lead rod connected and fixed to the main circuit upper terminal 5 using a nut 32, and is inserted into a hole 6 pre-drilled in the upper wall 1a of the all-molded insulating frame 1. The main circuit upper terminal 5 is placed on the upper wall 1a and fixed with bolts 7, 7 and nuts 8, 8 to be attached to the upper wall 1a.

A main circuit lower terminal 11 is provided on the rear wall 1c, and an insulating partition wall 33 is provided to cover the mounting nut 16 of this terminal 11 and to be located below the vacuum interrupter and to extend between the interphase barriers 1e. This insulating partition wall 33 is the end plate 3 of the vacuum interrupter 31.
The insulating end plate 34 is disposed with a gap 35 of about 3 to 5 mm from the insulating end plate 34 . Further, a vacuum interrupter 3 is installed at a predetermined portion of the partition wall 33.
An insertion hole 36 for one movable lead rod 31a is provided. When the contact is opened, the lower end of the metal cup part is at the same potential as the fixed lead side, and this part, the movable lead side of the current-carrying nut 17, and the main circuit lower terminal 1
1. The insulation distance (insulation strength) between members with edges such as the terminal mounting nut 16 is a problem.
As described above, the insulating end plate 3 of the vacuum interrupter 31
Since the insulating partition wall 33 is provided at a predetermined distance of 35 from the vacuum interrupter 3
The insulation distance of 1 becomes longer as shown by the dotted line,
It is possible to improve insulation strength.

As described above, according to this invention, a melter cup type vacuum interrupter is provided, and an insulating partition wall is provided at a predetermined distance from the end plate of the interrupter, so that the entire device can be made compact and the insulation strength can be ensured. There are advantages. In addition, the vacuum container of the vacuum interrupter of this invention is formed of a cup made of metal and an insulating end plate that covers the opening of this cup, and the insulation distance between the two contacts when the contacts are open is The end plate part is responsible for this, and while conventional vacuum interrupters maintain insulation strength in the vertical insulation creepage distance, this device maintains insulation strength in the horizontal insulation creepage distance. Therefore, the axial length (height) of the vacuum interrupter itself can be shortened, thereby reducing the overall height of the switchgear. Further, the insulation strength can be improved by the insulating partition wall.

[Brief explanation of the drawing]

FIGS. 1 and 2 are a front view and a sectional view taken along the - arrow direction of a conventional example, and FIG. 3 is a sectional view of essential parts showing an embodiment of this invention. 1... Fully molded insulation frame, 1a... Top wall, 5... Main circuit upper terminal, 6... Hole, 7... Bolt, 8... Nut, 11... Main circuit lower terminal,
31...Metal cup type vacuum interrupter, 33
...Insulating bulkhead, 34...End plate, 35...Gap, 3
6...hole.

Claims (1)

[Claims for Utility Model Registration] An electromagnetic operating mechanism 22 is housed in the lower part of the insulating frame 1, and a cup-shaped container 31b made of metal is provided in the upper part of the insulating frame 1, and an insulating end plate that covers the opening of the container. 34, a vacuum interrupter formed with the container 31b lying face down on the insulating end plate 34 is disposed, and a fixed lead rod 31c is provided through the ceiling of the container 31b while maintaining airtightness, A movable lead bar 31a facing the fixed lead bar 31c is provided to airtightly penetrate through the insulating end plate 34 via a bellows 31d, and the main circuit upper terminal 5 is connected to the outer end of the fixed lead bar 31c. The upper part 5 is attached to the upper wall 1a of the insulating frame 1, and an insulating partition wall 33 integrally formed with the insulating frame 1 is provided at the lower part of the insulating end plate 34 with a gap 35 interposed therebetween. A vacuum switching device characterized in that it is formed in a larger size and that the partition wall 33 is provided with an insertion hole 36 for a movable lead rod 31a connected to the electromagnetic operation mechanism 22.