JPS6215978B2 - - Google Patents

Description

[Detailed description of the invention] 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, and are formed at positions slightly inward from the top walls 1a and 1b. 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 upper wall 1a, but the bolt heads are sunk into shallow detent grooves 10, 10 formed on the inner surface of the upper 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 14 is
is pressed down so that it engages with the front corner of the upper edge of the through hole (not shown), and the bolt 15 inserted into the bolt insertion groove 13 is turned through the through hole, and the nut in the nut mounting pocket 12 is inserted. 16 and is fixed to the rear wall 1c. The bolt 15 is to be installed by temporarily tightening the nut 16 to the bolt 15 passed through the stopper 14 and the main circuit lower terminal 11, and then inserting the shaft of the bolt 15 into the bolt insertion groove 13, then tightening the nut 16.
This can be done easily by inserting the bolts into the nut mounting pockets 12 and turning the bolts 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 19, an insulating rod 20, and a pressure contact spring 21. This electromagnetic operation mechanism section 22 includes an operation electromagnet 2
2a, operating lever 22b, this operating lever 22b
A movable iron piece 22c and a bow spring 22d connected to
and a stopper piece 22c.

As mentioned above, the conventional vacuum switchgear is composed of a fully molded insulating frame 1 with a box-shaped outer shape, and the insulating distance between each phase must be considerably large due to the shape and mounting condition of the vacuum interrupter, resulting in a large insulating frame. The disadvantage is that the overall size of the device increases. It is also possible to downsize the insulation frame by reducing the insulation distance between the phases, but in order to reduce the insulation distance between the phases, it is necessary to increase the size of the reinforcing ribs 1i that lengthen the insulation distance on the upper wall 1a of the insulation frame, or to reduce the insulation distance between the phases. It becomes necessary to make the barrier 1e thicker. Furthermore, the conventional vacuum switchgear has the following drawbacks in terms of assembly (connection on the fixed terminal side).

The connection between the main circuit upper terminal 5 and the fixed lead rod of the vacuum interrupter must be strong in order to reduce contact resistance. In this case, when connecting the two, there is no means for fixing the vacuum interrupter, so special means must be used to firmly hold it while connecting the upper terminal of the main circuit. , the task is very difficult.

It is also possible to install the vacuum interrupter with the main circuit upper terminal fixed to the insulating frame in advance, but in this case, the vacuum interrupter must be inserted into the frame from the bottom and held, and the vacuum interrupter and main circuit This work can be relatively easily done by providing a rotation prevention mechanism (for example, a hole on the terminal side and a pin corresponding to the hole on the end plate of the vacuum interrupter) between the upper circuit terminal, but special rotation is required. There is a problem that requires a stop mechanism.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vacuum switchgear that is capable of reducing the size of the entire device and ensuring a sufficient insulation distance between phases of a vacuum interrupter.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. The same parts as in FIGS. 1 and 2 are designated by the same reference numerals. In FIGS. 3 and 4, the box-shaped all-molded insulating frame 31 is
It has a box shape formed in the same manner as the frame 1 shown in FIGS. 1 and 2, and an electromagnetic operating mechanism and a connecting member to the movable lead rod of each vacuum interrupter are housed within the frame. A metal cup type vacuum interrupter 32 is installed on the top side of the upper wall 33 of the frame.
The cylindrical partition wall 31a is erected so as to house the cylindrical partition wall 31a. This metal cup type vacuum interrupter 32
consists of a cup-shaped metal container 32b and an insulating end plate (ceramic disk) 32a provided to cover the opening of the container 32b, and the metal cup is placed face down on the insulating end plate 32a. A vacuum container is formed, a fixed lead rod 32c is airtightly provided on the ceiling of the metal cup, and a movable lead rod 4a facing the fixed lead rod 32c is airtightly penetrated through the insulating end plate 32a via a bellows 32d. It constitutes a vacuum interrupter. 32e is a shield. A through hole 33a for the movable lead rod 4a is provided in the upper wall 33 of the frame which becomes the bottom wall of the cylindrical partition wall 31a.
is provided. Further, the cylindrical partition wall 31a is formed with a gap 34 between adjacent phases to increase the creepage insulation distance. The fixed side electrode of the vacuum interrupter 32 is fixedly connected to the main circuit upper terminal 5 by a nut 35, and the main circuit upper terminal 5 is placed on the upper end of the cylindrical partition wall 31a. Screw holes 36, 36 are provided at the ends, and bolts 37, 37
are screwed into embedded metal fittings 36, 36 having screw holes, whereby the main circuit upper terminal 5 is fixed and the vacuum interrupter 32 is supported. Interphase barrier 38,3
8 is suspended by a predetermined length from the lower surface side of the upper wall 33 of the frame. A ring-shaped insulating packing 39 is interposed between the bottom of the cylindrical partition wall 31a and the insulating end plate 32a of the vacuum interrupter 32, thereby increasing the insulation strength of the vacuum interrupter 32. An electromagnetic operating mechanism section 22 for operating the vacuum interrupter 32 is housed in the lower part of the entire mold insulating frame 31, and this mechanism section 22 and each vacuum interrupter 3 are connected to each other.
The adjusting rod 19 and the insulating rod 20 connected to the rod 2 are separated and housed by an interphase barrier 38.

As described above, the metal cup type vacuum interrupter 32 is housed within the cylindrical partition wall 31a on the frame,
In addition, the electromagnetic operation mechanism section 22 is housed within the frame, and the vacuum interrupter 32 and the electromagnetic operation mechanism section 22
Since they are stored separately, a sufficient insulating distance between them can be obtained, and the frame can be downsized.

Next, the vacuum interrupter 32 in the above embodiment
The work of installing the insulating frame 31 will be described.

A ring-shaped insulating packing 39 is installed at the bottom of the cylindrical partition 31a, and the vacuum interrupter 32 is dropped into the cylindrical partition 31a. Then, the main circuit upper terminal 5 is placed on the vacuum interrupter 32 by inserting it into the fixed lead rod of the vacuum interrupter 32, and the terminal 5 is provided across the upper part of the cylindrical partition wall 31a in the radial direction. The main circuit upper terminal 5 is screwed and connected to the cylindrical partition wall 31a via the bolt 37, and thereby the vacuum interrupter 32 is pushed down by the downward pressing force of the terminal 5 against the elastic force of the insulating packing 39, and the vacuum The vacuum interrupter 32 is fixed by pressing the interrupter 32 to the upper wall 33 of the frame, which is the bottom of the cylindrical partition 31a, and the insulating packing 39.
Install and fix. And nut 3 on the fixed lead rod
5 and connect it to the main circuit upper terminal 5.

FIG. 5 shows another embodiment of this invention,
In FIG. 5, an insulating soft material 41 is placed in the gap between the vacuum interrupter 32 and the cylindrical partition wall 31a.
The purpose is to prevent the outer wall of the vacuum interrupter 32 from rust and protect it from dust and the like, and to ensure creepage insulation distance between the phases. In the assembly operation shown in FIG. 5, the cylindrical partition wall 31a is further filled with an insulating member. In the case of FIG. 5, the vacuum interrupter 32 is pushed into the cylindrical partition 31a, and in a state where the vacuum interrupter 32 is lifted from the bottom by the thickness of the insulating ring 39, a particularly soft material 41 among the insulating members is filled. Then, this insulating member enters between the vacuum interrupter 32 and the bottom, and the insulating end plate 32 of the vacuum interrupter 32
The insulation strength of part a increases. In this state, attach the main circuit upper terminal 5 and connect the vacuum interrupter 3.
Press 2 downward to install and fix.

Next, the effects of the above embodiment will be described. first,
Let's talk about Figure 3.

The vacuum interrupter 32 is almost completely buried within the cylindrical partition wall 31a, and only the main circuit upper terminal 5 protrudes from the top.The insulation distance between the phases is sufficiently secured by the cylindrical partition wall 31a, and the upper terminal 5 The distance between the phases can be reduced to a distance where the dielectric strength between the phases can be maintained.

Furthermore, by inserting and standing an insulating barrier in the gap 34 located between the cylindrical partition walls 31a of each phase, the insulation strength between the five phases of the main circuit upper terminals can be improved, and the distance between the phases can be further reduced.

The vacuum interrupter 32 is installed by dropping into a cylindrical partition wall 31a having a bottom.
The main circuit upper terminal 5 extends radially across the upper part of the main circuit 1a.
By providing this terminal, the vacuum interrupter 32 is pressed downward, that is, to the bottom, so a nut 35 is screwed to connect the fixed lead rod of the vacuum interrupter 32 and the main circuit upper terminal 5. At this time, the vacuum interrupter 32 can be firmly connected without using any special means unlike the conventional ones, and the vacuum interrupter 32 can be firmly connected to the bottom and the insulating packing 39.
Due to the contact resistance caused by the pressing force on the nut, there is no possibility of the nut turning when screwed together.

Next, the effect of the embodiment shown in FIG. 5 is that a soft insulating member 41 is filled between the vacuum interrupter 32 and the cylindrical partition wall 31a, and the vacuum interrupter 32 is completely covered, so it is rust-proof and protected from dust. and the insulating end plate 32 of the interphase and vacuum interrupter.
The dielectric strength of a can be improved.

In each of the above embodiments, the partition wall surrounding the vacuum interrupter is described as being cylindrical, but it is not limited to being cylindrical, and may be any polygonal shape such as a quadrangle or triangle, or an elliptical shape as long as it is cylindrical. . In addition, since the vacuum interrupter is formed with a metal cup facing down on the insulating end plate, even if the main circuit upper terminal is attached and the vacuum interrupter is assembled in a pressed state inside the cylindrical bulkhead, this pressing compression force will not be applied to the vacuum. This pressing compression force is effectively absorbed and alleviated by the metal cup portion without destroying the interrupter.

As described above, according to the present invention, the metal cup type vacuum interrupter is housed within the cylindrical partition formed on the insulating frame, and the electromagnetic operation mechanism is housed within the insulating frame partitioned by the partition. In addition to ensuring a sufficient interphase insulation distance and using cylindrical partitions, the insulation frame can be downsized, and the following effects can be obtained.

(a) Since the main circuit upper terminal is provided at the upper end of the cylindrical bulkhead, the vacuum interrupter is pressed downward by this terminal and is clamped and fixed between the terminal and the upper wall. In order to become
No special means of fixing the vacuum interrupter are required.

(b) When fixing the terminal and the fixed lead rod with the fastening body, the vacuum interrupter does not rotate as the fastening body is fastened due to contact resistance due to the pressing force on the upper wall and the insulating packing.

(c) The end plate is used only in one place, and the vacuum container of the vacuum interrupter is mainly formed of a metal cup, so even if the terminal is attached and the vacuum interrupter is assembled in a pressed state, the interrupter will not close due to the pressure compression force. It does not break and the compressive force is effectively absorbed and alleviated by the metal cup.

[Brief explanation of the drawing]

1 and 2 are a front view and a sectional view taken in the direction of arrows 1 and 2 showing a conventional example, and FIGS. 3 and 4 are a partially sectional front view and a sectional view showing an embodiment of the present invention.
FIG. 5 is an enlarged cross-sectional view in the direction of arrows, and a partially sectional front view showing another embodiment of the present invention. 31...Box-shaped all-molded insulation frame, 31a
...Cylindrical bulkhead, 32...Metal cup type vacuum interrupter, 33...Bottom, 40...Side wall, 22...
...Electromagnetic operation mechanism section.

Claims (1)

[Claims] 1. A metal cup-shaped vacuum interrupter consisting of a cup-shaped metal container and an insulating end plate that covers the opening of the container, and this vacuum interrupter is placed on the upper wall of a box-shaped insulating frame, and An insulating packing interposed between the insulating end plate of the vacuum interrupter, a cylindrical bulkhead erected on the upper wall of the box-shaped insulating frame and surrounding the vacuum interrupter, and a diameter A vacuum switchgear comprising a main circuit upper terminal disposed in a direction, and a fastening body for fixing this terminal to a fixed lead rod led out from the ceiling of a vacuum interrupter in an airtight manner.