JPS6230755Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas leakage lock 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, the electrical performance will deteriorate. Since the pressure decreases, 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 meet the above-mentioned needs, and includes a bellows that expands and contracts in response to changes in gas pressure within a switch box filled with gas, and a bellows that is connected to the bellows and protrudes outside the switch box. It is equipped with a bellows shaft that moves forward and backward as it expands and contracts, and is provided outside the switch box with a starting pin that engages with the 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 a lockshaft which is rotated by a rotation spring when the lock lever is released when activated, and this lockshaft includes a changeover switch lever that acts on the power lock switch, a lock fitting for the handle shaft, and a lock shaft connected to the switch shaft in the switch box. This device relates to a gas leakage locking device for a gas switch, which is characterized by having a locking fitting for the interlocking shaft, and its purpose is to lock the bellows shaft as the bellows expands when the gas pressure inside the switch box drops below normal. The lockshaft rotates when the start pin moves backward, the start pin operates, and the lock lever releases, and the power supply switch lever opens the power lock switch.The handle shaft and switch shaft are locked by each lock fitting, and neither can be opened or closed without being able to rotate. This makes it impossible to open and close the switch inside the container.

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.A bellows 3 is attached to the inner surface of the wall plate 2 by a base plate 3a, and a bellows shaft 4 inserted into the bellows is attached at one end to the top of the bellows. The other end of the bellows is inserted through an adjusting screw 3b at the center of the base plate 3a to protrude outside the wall plate 2, and a bellows extension spring 3c is installed around the bellows shaft 4 between the top of the bellows 3 and the adjusting screw 3b. Reduce. Further, a link receiving part 5a is provided on the wall plate 2 apart from the bellows shaft 4, and the link receiving part 5a and the bellows shaft are connected to each other so as to control the action of a starting spring to be described later and prevent excessive force from being applied to the bellows shaft. link between 4 and 5
are connected by pins 5b and 5c. Furthermore, mechanism side plates 6a and 6b are provided on the outer side of the wall plate 2 in parallel with the wall plate 2 at a required interval, and support the lock mechanism and other necessary mechanisms.

At the upper part of the mechanism side plate 6a, a starting pin 7 is provided in a holding part 7a provided on the plate surface so as to be movable up and down, and a stopper 8a for stopping 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 protruding above the starting pin 7,
A starting spring 8 is tensioned between the two stoppers 8a and 8b so that the starting pin 7 is pulled up by the spring 8. 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 holds the starting pin 7 in the same position, and when the gas pressure inside the switch box 1 drops below normal pressure, the bellows shaft 4 retreats due to the expansion of the bellows 3, and the protruding end 4a moves to the engaging portion 7b. The starting pin 7 is pulled up by the starting spring 8.

Below the starting pin 7, a lock shaft 10 is oriented rigidly by a support plate 9 fixed to the mechanism side plate 6a.
The lock shaft 10 has a lock lever 12 and a switch switching lever 1 in order from the top.
3. Provide lock fittings 14, 15 and wire hook 16.

The lock lever 12 has a long hole 12 as shown in FIG.
When the lower end protrusion 7c of the starting pin 7 is inserted and engaged from above during normal operation, it is stopped at the position shown by the solid line in FIG. 3, but the gas pressure inside the switch box 1 is abnormal. When the bellows shaft 4 is lowered, the protruding end 4a of the bellows shaft 4 is disengaged from the engaging portion 7b of the actuating pin 7, and the actuating pin 7 rises, and its lower end protruding portion 7c comes out of the elongated hole 12a of the lock lever 12, so that the lock shaft 10 rotates freely, and the lock lever 12 stops at the position shown 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 box 1 is normal, the switch switching lever 13 operates on the lock shaft 10. When the power supply lock switch 17 is in the position shown by the solid line in FIG. 4, it is rotated together with the lockshaft to the position shown by the chain line in FIG.

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 and disengage with 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, a notch 22a is provided in the lock plate 22, and when the lock fitting 15 rotates and engages, the interlocking shaft 21 is locked, and the switch shaft 23 is unable to rotate together with the shaft 21. In this state, the switch shaft 23 cannot be opened or closed. It is impossible to operate the device.

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 the figure, manual operation becomes a mechanical lock and automatic operation becomes an electrical lock.

That is, in FIG. 2, in 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, both shafts 19 and 21 are connected to the lock plate 20, respectively. , 22 is shown locked by the engagement of the locking fittings 14, 15 with the notches 20a, 22a of the locking fittings 14, 15. FIG. 8 shows the interlocking shaft 21 being disconnected from the handle shaft 19 and the interlocking shaft 21 by electrical automatic operation.
1. When the switch shaft 23 is operated, the power lock switch 17 is opened and both shafts 19 and 21 are locked by the engagement of the lock fittings 14 and 15 with the notches 20b and 22a of the lock plates 20 and 22, respectively. Show the place. 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.One end 27a of the stopper 27 is connected to the end of the wire 24, and the other end is connected to the stopper 27. 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.
When the display bar 29 is disengaged 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 the closed state to the open state or from the open state to the closed state, when the gas pressure inside the switch is below a predetermined pressure, As the bellows expands, the bellows shaft comes off the starting pin, and this starting pin operates, releasing the lock lever on the lockshaft, so the lockshaft rotates, and the switch lever on the shaft opens the power lock switch, opening the two lock levers. The locking fittings lock the handle shaft and the interlocking shaft, respectively. Therefore, when the pressure of the sealed gas 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 erroneous operation and it is safe.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention, and Fig. 1 is a front view with the main parts cut away, Fig. 2 is a half-sectional view of the left side of Fig. 1, Fig. 3, Fig. 4, and Fig. Figures 5 and 6 are -, -, - of Figure 2, respectively.
, Fig. 7 is a front view of the display state of the display device at the bottom of Fig. 1, and Figs. 8 and 9 are the locks of the parts shown in Fig. 2. It is a state side view. 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 mechanism 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, 17 is a power lock switch, 18 is an opening/closing piece, 19 is a handle shaft,
21 is an interlocking shaft, 20 and 22 are lock plates, 2
3 is a switch shaft.

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. A gas opening/closing device characterized in that the lockshaft is provided with a changeover switch lever that acts on a power lock switch, a locking fitting for a handle shaft, and a locking fitting for an interlocking shaft connected to a switch shaft in a switch box. Gas leakage lock device.