JP3042663B2 - Gas switch with lock mechanism when gas pressure drops - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas switch in which an arc-extinguishing gas such as a sulfur hexafluoride gas is sealed at a predetermined pressure in a switch, and more particularly to a lock mechanism when the gas pressure drops. It is.

[0002]

2. Description of the Related Art Conventionally, a gas-filled switch is provided with a gas pressure reduction lock mechanism that locks an opening and closing operation mechanism when the gas pressure falls below a predetermined pressure. This gas pressure reduction lock mechanism is provided for safety by reducing electrical performance such as withstand voltage in a switch case in which gas is sealed when the gas pressure is reduced. .

An operation test is performed on the lock mechanism that operates when the gas pressure drops, at the time of manufacture. That is, after the arc-extinguishing gas is sealed in the switch case with the lock mechanism, the gas pressure is reduced until the lock operation is performed, and it is tested whether the lock operation is normal when the specified gas pressure is reduced. It is. Then, when it is confirmed that the lock mechanism operates normally, gas is sealed again, the lock mechanism is reset, and the product is shipped.

[0004] By the way, a switch of a type in which an opening / closing operation mechanism is provided outside the opening / closing room as a mechanism room has also been proposed, but the opening / closing room and the mechanism room are combined to complicate the case structure. Alternatively, there is a problem of increasing the size. Therefore, in recent years, a switch of a type in which an opening / closing operation mechanism is provided in an opening / closing room for compactness has been proposed.

[0005]

However, in a switch in which an opening / closing operation mechanism is provided in an opening / closing chamber filled with gas and the opening / closing operation mechanism is locked by a lock member of the lock mechanism, there is a conventional switch. Has an operation hole for resetting the lock mechanism on the side wall that defines the open / close chamber,
The operation hole is normally closed. At the time of resetting, the lock member of the lock mechanism is positioned on the reset side via the operation hole, and in this state, gas is sealed through a gas sealing hole provided on a side wall separately from the operation hole. .

As described above, in a switch of the type in which the opening / closing operation mechanism is provided in the opening / closing chamber and the opening / closing operation mechanism is locked by the lock mechanism provided in the opening / closing chamber, the operation is conventionally performed separately from the gas filling hole. Holes need to be provided. or,
After resetting the lock mechanism after the test operation, it is necessary to seal the operation hole again. Therefore, conventionally, it has been necessary to ensure an airtight structure for the operation hole in addition to the gas filling hole.

The present invention has been made in view of the problems existing in the prior art, and has as its object to reduce the size by installing a lock mechanism in an open / close room. Another object of the present invention is to provide a gas switch which facilitates a reset operation, has high airtightness, and has a lock mechanism at the time of gas pressure drop.

[0008]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a gas pressure detecting mechanism for detecting when a gas sealed in a switch case drops to a predetermined pressure; In response to the detection operation of the detection mechanism, the lock pin provided in the switch case is protruded in the axial direction to lock the operation of the open / close operation mechanism in the switch case, and the lock pin is protruded. A lock mechanism for resetting by pressing in a direction opposite to the direction, and a gas sealing hole formed in the opening and closing case on the same axis as the axis of the lock pin and for inserting a gas by inserting a gas sealing jig. The gist of the invention is that it comprises a gas-filled portion.

[0009]

According to the present invention having the above-described structure, the gas pressure detecting mechanism performs a detecting operation when the gas sealed in the switch case drops to a predetermined pressure. In response to the detection operation of the gas pressure detection mechanism, the lock mechanism projects a lock pin provided in the switch case in the axial direction. The operation of the switching operation mechanism in the switch case is locked by the lock pin. In the lock mechanism, a reset is performed by inserting a gas sealing jig through a gas sealing hole formed on the same axis as the axis of the lock pin and sealing the gas and pressing the gas in a direction opposite to the projecting direction of the lock pin. Done.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a high-pressure gas switch for an underground line will be described with reference to the drawings.

As shown in FIGS. 1 and 2, a gas switch 1
Switch case 2 is formed in the shape of a square box and hermetically sealed.
An arc-extinguishing gas (sulfur hexafluoride gas in this embodiment) is sealed at a predetermined pressure in the internal opening / closing chamber 3. On the upper and lower surfaces facing each other in the switch case 2, the switch room 3
A power supply-side bushing 4 and a load-side bushing 5 whose inner ends protrude are fixedly penetrated for each phase.

A conductive member 6 in the bushing 4 protrudes from an inner end of the power supply side bushing 4, and a fixed electrode 7 constituting an opening / closing portion is further attached to the conductive member 6. Similarly, a conductive member 8 is attached to the inner end of the load side bushing 5.
Are protruding. Further, a movable electrode 9 constituting an opening / closing section together with the fixed electrode 7 is provided around the conductive member 8.
It is rotatably attached and arranged so as to be able to contact the fixed electrode 7.

An opening / closing operation shaft 10 is rotatably supported on the front side of the switch case 2.
A manual opening / closing operation lever (not shown) is detachable at the outer end of the. When the opening / closing operation lever is mounted on the coaxial 10, the lever is tightened and fixed by the nut 11. A swing lever 12 is provided at the inner end of the opening / closing operation shaft 10.
And the tip of the swinging lever 12 is connected to the lever 15 of the opening / closing link mechanism 14 via the direction changing link 13.
It is connected to. Opening and closing operation shaft 10, swing lever 12,
The direction changing link 13 and the link mechanism 14 constitute an opening / closing operation mechanism. Further, the tip of the link 16 of the opening / closing link mechanism 14 is rotatably connected to the center of the movable electrode 9, and the linear movement of the link 16 rotates the movable electrode 9. That is, when the open / close drive lever is rotated clockwise or counterclockwise in FIG. 1, the swing of the swing lever 12 is converted by the direction conversion link 13 into a vertical movement (arrow A) in FIG. The end of the lever 15 of the opening / closing link mechanism 14 is moved up and down. By this vertical movement, the link mechanism 14 rotates the movable electrode 9 (in the direction of the arrow B in the figure). When the movable electrode 9 rotates in the direction of the fixed electrode, the fixed electrode 7
Receiving the leading end of the power supply to conduct electricity between the power supply side and the load side. Conversely, when the movable electrode 9 rotates in a direction in which the movable electrode 9 is separated from the fixed electrode 7, the movable electrode 9 is separated from the fixed electrode 7, and the connection between the power supply side and the load side is released.

Further, on the front side of the switch case 2, an on / off display section 17 and a gas filling section 18 are provided. The turning shaft 19 of the ON / OFF display unit 17 is rotatably supported by the switch case 2, and a pointer 20 is fixed to the outer end. The inner end of the rotating shaft 19 is connected to the opening / closing operation shaft 10 by a connection mechanism (not shown), and the indication of “in” and “off” of the hands 20 is displayed in conjunction with the opening / closing operation shaft 10. It can be switched. The gas filling part 18 is
In order to fill the arc-extinguishing gas into the opening / closing chamber 3 from here, a sealing hole 21 into which a gas sealing jig described later is inserted is provided, and a lid 22 is always fitted outside.

As shown in FIG. 3, the bellows 25 is mounted on the upper outer peripheral surface of the switch case 2 so as to be located outside the switch case 2. A cap 26 is fitted around the outer periphery of the bellows 25, and a bolt 28 provided upright on the switch case 2 penetrates through an insertion hole provided in a flange portion 27 of the cap 26. The cap 26 is fastened and fixed. Bellows 25
A bellows shaft 29, which constitutes a gas pressure detecting mechanism, projects upward from the center of the inner bottom wall of the bellows 25. When the gas pressure in the switching chamber 3 decreases, the bellows 25 contracts, and accordingly, the bellows shaft 29 also moves toward the switch case 2. When the gas pressure in the opening / closing chamber 3 is equal to or higher than a predetermined pressure,
The top of the bellows shaft 29 protrudes upward through a through hole at the top of the cap 26.

The rotating shaft 32 is rotatably fitted via an O-ring 35 to a tubular portion 34 protruding from the upper part of the switch case 2. The O-ring 35 keeps the open / close chamber 3 airtight. The latch 31 is fixed to the rotation shaft 32 by a bolt 36, and is integrally rotatable together with the rotation shaft 32. A coil spring 33 is provided on the rotating shaft 32.
Is wound, and one end thereof is locked by the latch 31, so that the latch 31 is urged in the engagement direction (upward direction orthogonal to the paper surface in FIG. 3). Further, the tip of the latch 31 is locked on the upper part of the bellows shaft 29, so that the rotation of the rotation shaft 32 is prevented. A cover 37 is provided so as to cover the periphery of the gas pressure detection mechanism. The cover 37 is detachably attached to the switch case 2 with bolts 30 to protect the gas pressure detection mechanism.

The inner end face of the rotating shaft 32 faces the opening / closing chamber 3, and a lever 38 is formed on the inner end face. The lever 38 has a pressing projection 39 projecting from a position away from the center of the shaft. Due to this eccentricity, when the rotation shaft 32 rotates, the pressing protrusion 39 moves its position toward the front of the drawing.

A channel-shaped bracket 46 is fixed to the inner surface of the switch case 2 below the bellows 25 in the switch room 3. Also, the bracket 46
A plate-shaped stopper 54 is fixed to the case 2 in parallel with the case. The lock pin 45 constituting the lock mechanism is arranged such that the axis of the lock pin 45 is coaxial with the sealing hole 21. That is, the lock pin 45 is slidably fitted to a lower portion of the bracket 46 on a guide pin 47 protruding toward the sealing hole 21, and is shown by a two-dot chain line projecting leftward in the drawing. Position and bracket 4
6 can be moved to and from an unlocked position close to 6.
The lock pin 45 has a flange portion 49 formed at the center thereof, and a coil spring 48 is disposed between the flange portion 49 and the bracket 46. The spring 48 urges the lock pin 45 leftward in FIG.

When the lock pin 45 is projected, its tip projects to the left in FIG. 3 through a through hole at the lower end of the stopper 54, and the flange 49 is
4, the lock position is always kept at a fixed position. The locked position is the swing lever 1
2 is located on the rotation locus.

As shown in FIG. 4, the center of the latch lever 50 is supported by a shaft 51 provided between the bracket 46 and the stopper 54, and the latch lever 50 is rotatably mounted on the bracket 46 about the shaft 51. Is being worn. Latch lever 5
The first end 50a of the lock pin 45 is
The lock pin 45 is held at the unlock position by being locked to the lock pin 9. Second end 50 of latch lever 50
b is urged by a coil spring 55 having one end fixed to the opening / closing case 2 in a direction in which the locking of the flange portion 49 is released. When the gas pressure in the open / close chamber 3 is equal to or higher than a predetermined value, the second protrusion 50 b
Is locked and its movement is prevented. Therefore, the locking of the flange portion 49 is maintained.

A limit switch 52 is further attached to the bracket 46, as shown in FIG. The lever 53 of the limit switch 52 can come into contact with the flange 49 of the lock pin 45 located at the unlock position, and when the lock pin 45 is at the unlock position, the switch 52 is turned on and the lock pin 45 is locked. It turns off when in position. Therefore, the position of the lock pin 45 is converted into "ON" and "OFF" of the electric signal by the limit switch 52 and used for display or other control.

Next, the operation of the gas switch 1 configured as described above for the lock operation when the gas pressure decreases, such as a test after assembly, will be described. Now, in this gas switch 1, when the gas pressure in the switch case 2 is maintained at a predetermined value or more, as shown in FIG. 3, the bellows 25 of the gas pressure detecting mechanism expands due to the gas pressure. Thus, the latch 31 is locked on the bellows shaft 29. FIG. 4
As shown in FIG.
The lock pin 45 is held at the blocking position where the movement of the end portion 50b is prevented, and the lock pin 45 is held at the unlocked position with the first end portion 50a of the latch lever 50 locked by the flange portion 49.

In this state, if the gas in the switch 1 is intentionally withdrawn, or if the gas pressure falls below a predetermined value due to leakage or the like, the bellows 25 of the gas pressure detection mechanism contracts, and the bellows shaft 29 A part is moved into the opening / closing chamber 3, and the latch between the latch 31 and the bellows shaft 29 is released. Then, the rotating shaft 32 is rotated by the urging force of the spring 33, and the pressing protrusion 39 is moved from the blocking position with the rotation of FIG.
It moves in the direction shown by arrow C in the middle. Since the second end 50b of the latch lever 50 is urged by the coil spring 55, when the pressing projection 39 moves, the latch lever 50 similarly rotates clockwise about the shaft 51, The locking of the flange portion 49 is released. When the lock is released, the lock pin 45 is moved to the position shown by the two-dot chain line in FIGS. 2 and 3 by the urging force of the spring 48 and protrudes into the rotation locus of the swing lever 12. This position is such that the stopper 54 has the flange portion 49 of the lock pin 45 attached thereto.
Is determined by the contact. Accordingly, the swing of the swing lever 12 is prevented by the lock pin 45, and the opening and closing operation of the switch 1 is locked.

Next, the operation of resetting the lock while refilling the gas with the open / close operation locked will be described. In the state where the opening / closing operation is locked, the lock pin 45 protrudes as shown by a two-dot chain line in FIG.
At this time, the sealing plug 60 is fitted into the gas sealing hole 21 via the O-ring 61 to keep the opening / closing chamber 3 airtight.

The reset operation is performed with the cover 37 removed, as shown in FIG.
0 is screwed in, and the sealing jig 62 is inserted so that the locking pin 45 from which the sealing plug 60 projects is pushed back against the urging force of the spring 48. Next, the latch 31 is manually operated to rotate to a position where the tip of the latch 31 is locked to the bellows shaft 29 against the urging force of the spring 33, and is held at that position. As a result, with this rotation, the pressing projection 39 returns to the blocking position and presses the second end 50b of the latch lever 50. The latch lever 50 rotates counterclockwise about the shaft 51 against the urging force of the coil spring 55, and retracts to a position where the flange portion 49 of the lock pin 45 can be locked. With the lock pin 45 held at the unlock position, gas is sealed through the sealing jig 62, and when the reading of the pressure gauge 63 reaches a predetermined value, the bellows 25 reduces the gas pressure in the open / close chamber 3. By ascending, the bellows shaft 29 extends and the bellows shaft 29 protrudes from the cap 26. After the bellows shaft 29 protrudes, the latch 31 that has been held by hand against the coil springs 33 and 55 until then is released.
Is locked to the bellows shaft 29. As a result, the latch lever 50 is locked to the flange portion 49 of the lock pin 45 by the urging force of the coil spring 55, and the reset is completed. Thereafter, even if the sealing jig 62 is removed from the switch 1, the lock pin 45 is held at the unlock position. Then, the sealing jig 62 is pulled out from the switch 1, and the screw is returned with the sealing plug 60 remaining in the sealing hole 21.
Pull out only 2

As described in detail above, since the axis of the lock pin 45 and the sealing hole 21 are arranged coaxially, the reset operation can be easily performed only by inserting the gas sealing jig 62. be able to. Further, since it is not necessary to newly form a reset hole in the switch 1, the sealing hole 21 is not necessary.
Only the airtightness needs to be maintained, and the airtightness does not decrease.

The present invention is not limited to the above-described embodiment, and may be appropriately changed as follows without departing from the spirit of the present invention. (1) In the above embodiment, the bellows 25 and the bellows shaft 29 are used as the gas pressure detecting mechanism. Instead, the gas pressure detecting mechanism is constituted by a diaphragm and a shaft protruding from the center of the diaphragm. Alternatively, the latch may be locked by a shaft.

[0028]

As described in detail above, according to the present invention,
An excellent effect is provided that it is possible to provide a gas switch having a small size, easy reset operation, high airtightness, and a lock mechanism at the time of gas pressure drop.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a gas switch provided with a lock mechanism at the time of a decrease in gas pressure according to the present invention.

FIG. 2 is a sectional view showing the gas switch of FIG. 1;

FIG. 3 is an enlarged sectional view showing a pressure detection mechanism and a lock mechanism of the gas switch.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is an enlarged sectional view showing a pressure detection mechanism and a lock mechanism of the gas switch when gas is charged.

[Explanation of symbols]

2 switchgear case, (opening / closing operation mechanism) 10 opening / closing operation shaft, 12
Swing lever, 13: direction conversion link, 21: sealing hole, (constituting a detection mechanism) 25: bellows, 29: bellows shaft, 45: lock pin.

Continued on the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H01H 33/46 H01H 33/56 H02B 13/06

Claims (1)

(57) [Claims] 1. A gas pressure detecting mechanism for detecting when a gas sealed in a switch case drops to a predetermined pressure, and provided in the switch case in response to a detecting operation of the gas pressure detecting mechanism. A lock mechanism that locks the operation of the opening and closing operation mechanism in the switch case by projecting the provided lock pin in the axial direction, and performs a reset by pressing the lock pin in a direction opposite to the projecting direction of the lock pin, A gas sealing portion formed on the same axis as the axis of the lock pin and having a gas sealing hole through which a gas sealing jig is inserted to seal gas. Gas switch with lock mechanism.