JPH0127370Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas leak indicator device for a gas switch in which an arc-extinguishing gas, such as sulfur hexafluoride, is sealed in a switch box at a predetermined pressure.

The electrical performance of this type of gas switch is guaranteed by filling the switch box with SF ₆ gas at a specified pressure, for example, 1 kg/cm ² G, but if the gas leaks and the pressure drops significantly, the electrical performance Since the performance deteriorates, it is necessary to lock the operation of the switch when the pressure drops to the minimum guaranteed pressure, for example, 0.2 kg/cm ² ·G.

The present invention is designed to respond to the above request and to indicate that the operation of the switch is locked. It is provided with a bellows shaft that is connected and protrudes outside the switch box and moves forward and backward according to the expansion and contraction of the bellows, and a bellows shaft that is disposed outside the switch box is engaged with the bellows shaft when the bellows shaft advances and is stopped at a predetermined position, and when it is retracted. It is equipped with a starting pin that is actuated by a starting spring when it is disengaged, and a lock shaft that is actuated by a turning spring when the lock lever is released and rotated by the turning spring. A locking fitting is provided for a metal fitting and an interlocking shaft connected to the switch shaft in the switch box, and an indicator is provided that is linked to the lockshaft and is visible from the outside only when the switch is locked. This relates to a gas leak indicator device for a gas switch, and its purpose is to cause the bellows shaft to retract as the bellows extends, activate the starting pin, and release the lock lever when the gas pressure inside the switch box drops below normal. The lockshaft rotates and the power supply changeover switch lever opens the power supply lock switch, and the handle shaft and switch shaft are locked by the respective locking fittings, making both of them unrotatable and rendering the switch inoperable.At the same time, the lockshaft is linked to the The purpose is to expose the display to a visible state from the outside so that gas leakage and locks can be recognized.

Hereinafter, the present invention will be explained with reference to an embodiment shown in the drawings. FIG. 1 is a front view with main parts cut away, FIG. 2 is a half-sectional view of the left side of FIG. 1, FIG. 4
Figures 5 and 6 are respectively - of Figure 2.
, -, - and -, Fig. 7 is a front view of the display state of the display device at the bottom of Fig. 1, and Figs.
This is a side view of the part shown in the figure in a locked state, and each part is constructed as follows.

The switch box 1 houses a switch (not shown) and is filled with gas, and the inner surface of the wall plate 2 has a bellows 3.
At the same time, the bellows shaft 4 inserted into the bellows is fixed to the top of the bellows at one end, and the other end is inserted through the adjusting screw 3b at the center of the board 3a to protrude outside the wall plate 2. A bellows extension spring 3c is compressed around the bellows 3 between the top of the bellows 3 and the adjusting screw 3b. Also, the link receiving portion 5 is attached to the wall plate 2 away from the bellows shaft 4.
A is provided, and a link 5 is connected between the link receiving portion 5a and the bellows shaft 4 by pins 5b and 5c so as to control the action of a starting spring described later and prevent excessive force from being applied to the bellows shaft. . Furthermore, wall board 2
Mechanism side plates 6a and 6b are provided parallel to the outer side of the mechanism at a required interval, and support the lock mechanism and other necessary mechanisms.

The upper part of the mechanism side plate 6a is provided with a starting pin 7 that can be raised and lowered in a holding part 7a provided on the same plate surface, and a stopper 8a for fixing the lower end of the starting spring 8 is provided on the upper part of the pin. is provided with a support 8c having a stopper 8b projecting upward from the starting pin 7, and a starting spring 8 is tensioned between both the above-mentioned stops 8a, 8b so that the starting pin 7 is pulled up by the spring 8. do. An engaging portion 7b is provided on the side surface of the starting pin 7, and the protruding end 4a of the bellows shaft 4 is engaged with the engaging portion 7b. 4a, the activation pin 7 is held in the same position, and the switch box 1
When the internal gas pressure drops below normal pressure, bellows 3
The bellows shaft 4 retreats due to the extension of the projecting end 4a.
The starting pin 7, which has been disengaged from the engaging portion 7b, is pulled up by the starting spring 8.

Below the activation pin, a rigid lockshaft 10 is rotatably supported by a support plate 9 fixed to the mechanism side plate 6a, and is provided with a spring 11 for rotation. switching lever 13,
Locking fittings 14, 15 and wire hanging fittings 16 are provided.

The lock lever 12 has a long hole 12 as shown in FIG.
a, and the lower end protrusion 7c of the starting pin 7 is inserted and engaged from above during normal operation, thereby being restrained at the position shown by the solid line in FIG.
When the internal gas pressure drops abnormally, the protruding end 4a of the bellows shaft 4 disengages from the engaging portion 7b of the starting pin 7, the starting pin 7 rises, and its lower end protruding portion 7c engages with the elongated hole 12a of the lock lever 12. The lockshaft 10 becomes free and rotates.
The lock lever 12 is stopped at the position indicated by the chain line in FIG.

The switch switching lever 13 acts on the opening/closing piece 18 of the power lock switch 17 on the bracket 9a protruding from the support plate 9. When the gas pressure inside the switch 1 is normal, the switch switching lever 1
3 is located at the position shown by the solid line in Figure 4 together with the lockshaft 10, but in the event of an abnormality, it rotates together with the lockshaft to the position shown by the chain line in Figure 4 and presses the opening/closing piece 18 of the power lock switch 17 to open the switch. .

The lock fitting 14 is attached to a lock plate 20 on the handle shaft 19 supported between the mechanism side plates 6a and 6b.
The lock plate 20 has notches 20a and 20 that engage with and disengage from the lock fitting 14.
b are formed at predetermined intervals.

The lock fitting 15 is adapted to engage and disengage from a lock plate 22 on an interlocking shaft 21, and the interlocking shaft 21 is supported between the mechanism side plates 6a and 6b and is connected to the switch shaft 23 in the switch box 1. However, the lock plate 22 is provided with a notch 22a, and when the lock fitting 15 rotates and engages, the interlocking shaft 21 is locked, and the switch shaft 23 becomes unrotatable together with the shaft 21. It is impossible to operate the switch.

The handle shaft 19 and the interlocking shaft 21
are connected to each other by a transmission mechanism (not shown), and in the manual engagement state as shown in FIG. 2 and the automatic engagement state as shown in FIG. 8, the handle shaft 19 is mechanically locked, and the In the off state as shown in FIG. 9, manual operation becomes a mechanical lock, and automatic operation becomes an electrical lock.

That is, FIG. 2 shows a manual state in which the handle shaft 19 and the interlocking shaft 21 are in an interlocking state and the handle shaft 19, the interlocking shaft 21, and the switch shaft 23 are manually rotated. 20, 22
It is shown locked by the engagement of the notches 20a, 22a with the lock fittings 14, 15. 8th
The figure shows a state in which the handle shaft 19 and the interlocking shaft 21 are disconnected and the interlocking shaft 21 and the switch shaft 23 are activated by electrical automatic operation, the power lock switch 17 is opened, and both shafts 19 and 21 are connected to the lock plates 20 and 22, respectively. It is shown locked by the engagement of the locking fittings 14, 15 with the notches 20b, 22a. FIG. 9 shows that when the switch in the switch box 1 is in the off (open) state, the handle shaft 19 is mechanically locked by the engagement between the notch 20b of the lock plate 20 and the lock fitting 14, and the handle shaft 19 is interlocked. The shaft 21 is a lock plate 22
The notch 22a is detached from the lock fitting 15, and the lock is not mechanically locked, but is automatically locked by electrical operation.

One end of a wire 24 that is linked to an indicator to be described later is connected to the wire hook 16, and this wire 24 is freely inserted into a guide tube 25, and both ends of the guide tube 25 are secured by fasteners 25a and 25b. The wire 24 is fixed in place, and the other end of the wire 24 is connected to a stopper 27 of the indicator 26. The indicator 26 is connected to the tip of the indicator bar 29 combined with the guide bar 28, the guide bar 28 is fixed to the mechanism side plate 6b, and the indicator bar 29 has the guide bar 28 inserted into a guide hole 30 formed from one end thereof. By inserting these, the display bar 29 can be telescopically combined to pass through the mechanism side plate 6a, and a spring 31 for extrusion is attached to the outer periphery.
The indicator 26 at the tip extends through a guide tube 32 provided on the wall board 2 and is supported so as to be freely retractable, and the indicator 26 is colored for easy identification. is preferred.

The stopper 27 is rotatably supported by a pin 34 on a support portion 33 fixed to the side plate 6a of the mechanism, and is also provided with a spring 35.The end of the wire 24 is connected to one end 27a of the stopper 27, and the other end is connected to the end of the wire 24. The end portion 27b is pressed into engagement with the engaging portion 29a of the indicator bar 29 by the spring 35, and this engagement holds the indicator 26 in the retracted position. When the gas pressure inside the switch box 1 falls below normal, the stopper 27 is rotated against the spring 35 via the wire hook 16 and the wire 24 as the lockshaft 10 is rotated, and the stopper end 27b is rotated.
By explaining this from the engaging portion 29a of the display bar 29, the display bar 29 is moved by the spring 31, causing the display device 26 to protrude, and the desired display is performed.

With the above configuration and operation, when the switch in the switch box 1 switches from a closed state to an open state or from an open state to a closed state, when the gas pressure inside the switch is below a predetermined pressure, The extension of the bellows causes the bellows shaft to disengage from the starting pin, which activates and releases the lock lever on the lock shaft.The lock shaft rotates, and the switch lever on the shaft opens the power lock switch, opening the two locks. The metal fittings lock the handle shaft and the interlocking shaft, respectively. Therefore, when the sealed gas pressure in the switch box is below a predetermined limit, the switch cannot be opened or closed either manually or automatically, so there is no risk of accidental operation. As the switch moves, the indicator is activated and becomes exposed so that anyone can recognize it, so the indicator clearly shows that the switch is in the locked state and is effective in preventing mutual operation.

[Brief explanation of drawings]

The drawings show an example of the implementation of the present invention, and FIG. 1 is a front view with main parts cut away, FIG. 2 is a half-sectional view of the left side of FIG. 1, and FIGS. Figures 5 and 6 are -, -, - of Figure 2, respectively.
, - Figure 7 is a front view of the display state of the display device provided at the bottom of Figure 1, Figures 8 and 9 are the parts shown in Figure 2. FIG. 3 is a side view of the lock state. 1 is a switch box, 2 is a wall plate, 3 is a bellows, 4 is a bellows shaft, 5 is a link, 6a, 6b are machine side plates, 7 is a starting pin, 8 is a starting spring, 10
is the lock shaft, 11 is the rotation spring, 1
2 is the lock lever, 13 is the switch switching lever,
14 and 15 are lock fittings, 16 is a wire hanging fitting, 1
7 is a power lock switch, 18 is an opening/closing piece, 19 is a handle shaft, 21 is an interlocking shaft, 20,
22 is a lock plate, 23 is a switch shaft, 24 is a wire, 26 is an indicator, 27 is a stopper, 28
29 is a guide bar, 29 is a display bar, 30 is a guide hole, and 31 is an extrusion spring.

Claims (1)

[Scope of utility model registration request] The switch box includes a bellows that expands and contracts in response to changes in the gas pressure in a switch box filled with gas, and a bellows shaft that is connected to the bellows, projects outside the switch box, and moves forward and backward in accordance with the expansion and contraction of the bellows. On the outside, there is a starting pin that engages with the above-mentioned bellows shaft when it advances and is stopped in a predetermined position, and is disengaged and activated by a starting spring when it retreats, and when it is activated, the lock lever is disengaged and rotated by the turning spring. The lockshaft is provided with a changeover switch lever that acts on the power lock switch, a locking fitting for the handle shaft, and a locking fitting for an interlocking shaft connected to the switch shaft in the switch box, and further interlocked with the lockshaft. A gas leak display device for a gas switch, characterized in that it is provided with an indicator that is visible from the outside only when the switch is locked.