JPH08149631A - Device for indicating gas pressure drop in gas filled switch - Google Patents

Abstract

PURPOSE: To enable a device for indicating gas pressure drop in a gas filled switch to stably indicate a gas pressure drop even when the device is used for a long period by providing a movable shaft connected to bellows which expand and contract in accordance with the fluctuation of the gas pressure, a stationary indicating plate, an indicating plate, and a spring which turns the indicating plate toward the lower half side of the movable shaft. CONSTITUTION: When the gas pressure in a container 1 is normal, the front end section of a contacting piece 31 comes into contact with the contacting section 7 of a movable shaft 6 and an inverted indicating plate 30 is positioned to the upper half of a stationary indicating plate 26. As a result, the green surface of the plate 30 and green lower half of the plate 26 can be visually confirmed from the front face side of a cover 23. When the gas pressure in the container 1 drops, on the other hand, bellows 5 expand and the shaft 6 is moved backward. In addition, the piece 31 is separated from the section 7. As a result, the plate 30 is turned toward the lower half side of the plate 26 and stops when the plate 30 comes into contact with the lower half of the plate 26 and the red rear surface of the plate 30 and red upper half of the plate 26 can be visually confirmed form the front face side of the cover 23. Therefore, the gas pressure drop is indicated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas pressure drop display device for a gas filled switch which is used in a pole-mounted switch for distribution and which indicates a decrease in gas pressure in a container of the switch.

[0002]

2. Description of the Related Art A conventional gas pressure drop display device for a gas charging switch will be described with reference to FIG. In this figure, 1 is a container of a gas-filled switch having an airtight structure in which SF ₆ gas as an insulating gas is sealed, 2 is an opening formed in the container 1, 3 is a cover of the opening 2 and 3 is a packing 4. The flange mounted on the inner surface of the container 1 via the base 5 is a bellows whose base is attached to the flange 3 and extends due to a decrease in the gas pressure in the container 1, and 6 is a moving shaft whose base is fixed to the tip of the bellows 5. In addition, the tip portion penetrates the flange 3 and the opening 2, and is led out to the outside of the container 1. Reference numeral 7 denotes a large-diameter contact portion provided at the tip of the moving shaft 6.

Reference numeral 8 is a cover whose base is attached to the atmosphere side of the opening 2 of the container 1 via packing 9, and 10 is the container 1
Plate attached to the atmosphere side near the opening 2 of the
Reference numeral 1 denotes a rotary shaft whose base portion is rotatably supported by the mounting plate 10, which penetrates the cover 8 and whose leading end portion is led out from the cover 8. Reference numeral 12 is a packing attached to a contact surface of the rotary shaft 11 with the cover 8.

Reference numeral 13 denotes a contact rod provided on the rotary shaft 11, the tip of which is in contact with the contact portion 7 of the moving shaft 6. 14
Is a fixing pin provided on the inner surface of the cover 8 in the vicinity of the rotating shaft 11, and 15 is a torsion spring wound around the rotating shaft 11. One end is hooked on the contact rod 13 and the other end is hooked on the fixing pin 14 to make contact. A force is applied in the direction of applying the rod 13 to the contact portion 7. Reference numeral 16 is a display plate attached to the tip of the rotating shaft 11 with screws 17, and reference numeral 18 is a shield plate covering the display plate 16.

When the gas pressure in the container 1 is normal, the contact rod 13 contacts the contact portion 7 of the moving shaft 6 and the display plate 16 is covered by the shield plate 18, as shown in the figure. However, when the gas pressure decreases, the bellows 5 expands, the moving shaft 6 moves rearward, and the contact portion 7 separates from the contact rod 13,
The rotating shaft 11 is rotated by the torsion spring 15, and the display plate 16
Is rotated by a predetermined angle as indicated by the chain double-dashed line, the display plate 16 is exposed from the shielding plate 18, and the decrease in gas pressure is displayed.

[0006]

In the case of the above-mentioned conventional apparatus, the moving shaft 6 moves backward due to the decrease in gas pressure.
When the pressure applied to the contact surface between the contact portion 7 and the contact rod 13 of the moving shaft 6 is large, the moving shaft 6 does not move, and therefore the force applied to the contact surface between the contact portion 7 and the contact rod 13 by the torsion spring 15 is applied. I have to make it smaller.

On the other hand, due to long-term use, grease adheres to the packing 12 on the contact surface of the rotating shaft 11 with the case 8 or foreign matter adheres to it, so that the force required to rotate the rotating shaft 11 increases. .

Therefore, if the force of the torsion spring 15 is small,
Even if the contact portion 7 separates from the contact rod 13, the rotating shaft 11 does not rotate, and the display plate 16 may not be exposed from the shield plate 18.

The present invention has been made in consideration of the above points, and an object of the present invention is to provide a gas pressure drop display device for a gas filled switch which stably displays a drop in internal gas pressure even after long-term use. .

[0010]

In order to solve the above problems, a gas pressure drop display device for a gas filled switch according to the present invention comprises:
A bellows attached to the opening of the container of the gas-filled switch, which expands and contracts due to changes in the gas pressure in the container, and is connected to the bellows, moves due to the decrease in the gas pressure, and has its tip end outside the container. A moving axis positioned, a transparent front cover having a base attached to the atmosphere side of the opening of the container, a static display plate provided inside the cover, the upper half of which is red and the lower half of which is green; It is provided in the front of the upper half of the stationary display plate, the lower edge is rotatably supported by the support shaft, the front surface is green, the back surface is a semi-circular inverted display plate of red, and the reverse display plate, The tip portion of the moving shaft comes into contact with the tip of the moving shaft and is disengaged from the moving shaft by the movement of the moving shaft, and a spring for reversing the reverse display plate to the lower half side of the moving shaft.

[0011]

In the gas pressure drop display device of the gas charging switch of the present invention constructed as described above, a stationary display plate having a red upper half and a lower half green is provided inside a transparent front cover. In front of the stationary display plate, the lower edge of the semi-circular reversal display plate with the front surface green and the back surface red is rotatably supported by the support shaft, and the reversing display plate is provided with a contact piece. When the moving shaft fixed to the bellows moves due to lowering of the bellows, the contact piece disengages from the moving shaft, and the spring reverses the reverse display plate to the lower half side of the stationary display plate. , It can display the decrease of gas pressure. And
Since packing is not used in the rotating portion as in the conventional case, the decrease in internal gas pressure can be displayed stably even during long-term use. Further, most of the front surface of the low gas pressure display device can be used as a space for display, and the space can be effectively used.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment will be described with reference to FIGS. In these drawings, the same symbols as those in FIG. 4 indicate the same or corresponding ones, and the different points are as follows.

Reference numeral 19 denotes a cylindrical body whose base is attached to the atmosphere side of the opening 2 of the container 1 through a packing 20, and 21 is a transparent resin plate attached to the front end of the cylindrical body 19 with a liquid packing 22. , Cover 19 with tubular body 19 and transparent plate 21
3 are formed.

Reference numeral 24 is a mounting plate in which both end legs are attached to the container 1 in the cover 23, and the central portion is lifted up to cover the tip of the moving shaft 6. Reference numeral 25 is a rectangular through hole formed in the central portion of the mounting plate 24, 26 is a disk-shaped stationary display plate with the upper half attached to the mounting plate 24 being red and the lower half being green, and 27 is a stationary display plate. It is a rectangular through hole formed in the central portion of 26, and both through holes 25 and 27 overlap each other.

Reference numeral 28 is two support plates extending from both sides of the mounting plate 24, 29 is a support shaft supported by both support plates 28, and 30 is a support shaft 29 having both ends of its lower edge freely rotatable. It is a semi-circular inverted display plate supported by, the surface is green,
The back surface is red and is provided in front of the upper half of the stationary display plate 26. Reference numeral 31 is a contact piece formed by bending backward at the center of the lower edge of the reverse display plate 30.
It penetrates through 27, and the tip end hits the contact portion 7 of the moving shaft 6. 32 is a torsion spring wound around the support shaft 29, one end of which is on the front surface of the stationary display plate 26 and the other end of which is on the back surface of the reversing display plate 30.
A force for reversing the lower half of 6 is applied.

When the gas pressure in the container 1 is normal, the tip of the piece 31 comes into contact with the contact portion 7 of the moving shaft 6 as shown in the figure, and the reverse display plate 30 is placed on the stationary display plate 26. It is located in half and the reverse display plate 30 is from the front side of the cover 23.
The green on the surface and the green in the lower half of the stationary display plate are visible.

Then, the gas pressure in the container 1 decreases, the bellows 5 expands, the moving shaft 6 moves rearward, the contact portion 7 comes off the contact piece 31, and the reversal display plate 30 twists the spring 32.
Rotates to the lower half side of the stationary display plate 26, hits the lower half of the stationary display plate 26 and stands still, and from the front side of the cover 23, the red color of the back surface of the reverse display plate 30 and the red color of the upper half of the stationary display plate 26 are changed. Is visually recognized and the decrease in gas pressure is displayed.

[0018]

Since the present invention is configured as described above, it has the following effects. In the gas pressure drop display device for a gas charging switch according to the present invention, a stationary display plate 26 having an upper half of red and a lower half of green is provided inside a cover 23 having a transparent front surface, and a stationary display plate 26 is provided in front of the stationary display plate 26. The lower edge of the semi-circular inverted display plate 30 having a green front surface and a red back surface is rotatably supported by a support shaft, and a piece 31 is provided on the inverted display plate 30. When the moving shaft 6 fixed to 5 moves, the contact piece 31
Is disengaged from the moving axis 6 and the spring 32 reverses the reverse display plate 30 to the lower half side of the stationary display plate 26, and the lower half of the stationary display plate 26 and the reverse display plate 30 can display a decrease in gas pressure. Since no packing is used in the rotating portion, it is possible to stably display the decrease in the internal gas pressure even during long-term use. Further, most of the front surface of the low gas pressure display device can be used as a space for display, and the space can be effectively used.

[Brief description of drawings]

1A and 1B are a cut front view and a cut right side view of an embodiment of the present invention.

FIG. 2 is a front view of a portion of FIG. 1A.

FIG. 3 is a perspective view of another part of FIG. 1A.

4A and 4B are a cut front view and a cut right side view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container 2 Opening 5 Bellows 6 Moving shaft 23 Cover 26 Stationary display plate 29 Support shaft 30 Inverting display plate 31 Piece per piece 32 Spring

Claims (1)

[Claims] 1. A bellows which is attached to an opening of a container of a gas charging switch and expands and contracts according to a change in gas pressure in the container; and a bellows which is connected to the bellows and which moves when the gas pressure decreases, A moving shaft located outside the container, a transparent front cover having a base attached to the atmosphere side of the opening of the container, and a transparent cover provided inside the cover, the upper half of which is red and the lower half of which is green. And a semi-circular inverted display plate having a green front surface and a red back surface, which is provided in front of the upper half of the stationary display plate and whose lower edge is rotatably supported by a support shaft. A tip provided on the reversing display plate, the tip of which abuts on the tip of the moving shaft and which deviates from the moving shaft by the movement of the moving shaft, and the reversing display plate which is reversed to the lower half side of the stationary display plate. Gas pressure drop in gas-filled switch with spring Display device.