JPS6222047Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a device that quickly locks the opening/closing mechanism in the event of a gas leak in a pressurized gas-sealed gas switch or gas multi-circuit switchgear, etc., to prevent opening/closing operations. This relates to a gas differential pressure lock device that prevents personal injury and equipment damage.

In recent years, gas switches have come to be used in many cases as electrical switchgears. Gas switches are sealed with pressurized gas, so if a gas leak were to occur, it would cause problems such as injury to people, damage to equipment, and even damage to power distribution lines.

In view of these circumstances, the present invention is designed to prevent the occurrence of each of the above-mentioned accidents by immediately activating the gas differential pressure lock device when the gas pressure drops below the specified pressure.

Hereinafter, one embodiment of the present invention will be described based on the drawings. Reference numeral 1 denotes a case of a gas-tight housing of the switch main body sealed with pressure gas, and a sliding shaft 3 operated by an externally operated link 2 is tightly inserted into the gas-tight housing. As shown in FIG. 5, the opening/closing parts rst of each set RST are connected and installed in the housing, and the opening/closing parts rst are opened and closed via the movable insulator 4 according to the movement of the sliding shaft 3. ing. Reference numeral 5 denotes a flange fixed to the sealed housing 1 with bolts 7 via an O-ring 6, and the sliding shaft 3 is tightly inserted into the flange 5 via an O-ring 8 so as to be vertically slidable.

A bellows 9 which maintains the interior at atmospheric pressure and is expandable and retractable is inserted vertically into the gas-sealed case 1 constructed as described above.
A guide rod 10 is vertically inserted into the center of the bellows 9, and its lower end is brazed 11 to the inner bottom surface of the bellows 9 to make the guide rod 10 stand vertically at the center of the bellows. It stands out. An adjusting screw 12 is rotatably inserted into the protruding upper part 10', a helical spring 13 is interposed between the adjusting screw 12 and the inner bottom surface of the bellows 9, and the spring 13 is compressed by rotating the adjusting screw 12. Alternatively, the pressure resistance of the bellows can be adjusted by stretching it, and the adjustment screw 12 is placed in the space 14 that opens the case 1 of the sealed housing, and the adjustment screw 12 is airtightly adhered to the upper surface of the case 1 with an O-ring 15. The guide rod 10 is screwed 17 into the center of the airtight plate 16 so that the guide rod 10 can be moved up and down in accordance with the expansion and contraction of the bellows 9.

A cover body 18 is placed on the airtight plate 16 above the bellows 9 and the guide rod 10, and a lock cylinder rod 20 is laterally inserted into the cover body 18 from the front window 19, and the lock cylinder rod 20 is inserted rearward into the lock cylinder rod 20. Insert the extrusion spring 21 from the
1, the lock cylinder 20 is pushed forward. In addition, a stopper 23 is protruded by means such as forming a groove 22 in the lower center of the cylindrical rod 20, and protrudes upward when the gas pressure inside the sealed casing is at a specified pressure as shown in FIG. Upper end notch 2 of the guide rod 10
4 engages to stop the lock cylinder rod 20 at that position, and when the gas pressure inside the sealed housing decreases and the guide rod 10 lowers as shown in FIG. 2 and its upper end notch 24 comes off the stopper 23, The lock cylinder rod 20 is adapted to be pushed forward by the pushing pressure of the pushing spring 21. At this time, the locking rod 2 came out
At 0, there are two links 25, 2 on the front and back of the cylinder rod 20.
5 is provided to rotate the interlocking shaft 26 provided with a horizontal shaft, and the above-mentioned sliding shaft 3 is configured to be locked with the opening/closing part in the closed state or with the opening/closing part in the open state by an appropriate mechanism. ing.

A horizontal link 27 is rotatably attached to the upper end 10' of the guide rod 10, and the other end of the link is attached to a fixing bracket 28, and there is a space between the link and the fixing bracket to reduce friction. By interposing the bearing 29 in the bellows 9, the load of the extrusion spring 21 is transmitted from the notch 24 at the upper part of the guide rod to the fixing fitting 28 via the link 27, so that the expansion and contraction of the bellows 9 is not affected in any way. .

Further, as a locking mechanism for the sliding shaft 3, a protrusion 31 is protruded from the lower edge of the shaft head 30 at the upper end thereof, and an L-shaped stopper 32 is provided between the protrusion 31 and the front link 25 of the interlocking shaft. established,
A notch 33 is provided at the lower edge of the tip so that the L-shaped stopper 32 slides in a guide groove 35 in a guide stand 34 set on the upper surface of the case 1. It is connected to the link 25 by a connecting rod 36. Therefore, as shown in FIG. 2, when the opening/closing part is closed, the notch 33 of the stopper is engaged with the upper surface of the projection 31 on the shaft head, and when the opening is open, the lower surface of the raised projection 31 of the shaft head is engaged with the head surface of the stopper 32. You can catch it and hang it.

In addition, spring adjustment holes 37 are provided from the left and right sides of the central portion of the cover body 18 in order to heat the adjustment screw 12.
37, and a guide groove 38 in the front part of the cover body.
is provided, and the guiding convex 39 protruding from the lower surface of the lock cylinder 20 is lightly fitted into the lock cylinder 20.
This allows the driver to move straight forward and backward without getting upset. Reference numeral 40 denotes a mechanism cover provided to protect the device of the present invention.

Since the present invention is configured as described above, when the internal pressure of the pressure gas seal switch in the normal state drops below the specified pressure as shown in FIG. 1, the bellows 9 is expanded by the tension of the spring 13. Therefore, the vertical guide rod 10 inside the bellows descends, the stopper 23 of the lock cylinder lever and the notch 24 at the upper end of the guide rod come off, and the lock cylinder rod 20 is thrust forward by the elastic force of the extrusion spring 21. The head pushes the link 25 of the interlocking shaft 26 forward to rotate the shaft 26. Therefore, the link 25 of the interlocking shaft further allows the stopper 3 to be moved as appropriate.
2 is moved forward to close the opening/closing part, it engages the head 30 of the sliding shaft 3 from above as shown by the solid line in FIG. Latch the circuit in a closed state. If the switch is in the open state as shown by the broken line, the stopper 32 appropriately engages the head 30 of the sliding shaft from below to keep the sliding shaft 3, that is, the switch in the open state. In either case, the switch is activated immediately when the gas pressure drops, and the switch can be latched in a safe and secure state.
By rotating the interlocking shaft, it is also possible to mechanically lock other circuits, switch electric switches, and display information. Therefore, it is possible to prevent personal accidents and damage to equipment that have conventionally occurred, and to completely protect the power distribution line.

In addition, since the bellows of the present invention has an atmospheric pressure inside, there is no need for troublesome settings such as keeping the bellows in a vacuum, and devices other than the bellows can be installed outside the sealed case. , the device can be easily assembled, installed and maintained.

[Brief explanation of the drawing]

The figure shows one embodiment of the present invention, and FIG. 1 is a partially sectional front view showing the normal operating state of a gas-filled switch implementing a gas differential pressure locking device in a pressurized gas-sealed device. Figure 2 is a partially sectional front view showing how the sliding shaft is engaged when the switch is closed and opened in the case of a drop in gas pressure, Figure 3 is a front view of the lock barrel, and Figure 4 is a front view of the lock cylinder. FIG. 5 is a plan view of the link and fixing fittings for adjusting the guide rod, and a schematic diagram of the opening/closing part of the switch. 1... Pressure gas sealed case, 3... Sliding shaft for driving the opening/closing part, 9... Bellows, 10...
Guide rod, 10'... Upper part of guide rod, 12...
Adjustment screw, 13... Helical spring, 16... Airtight plate, 20... Lock cylinder rod, 21... Extrusion spring, 23... Stopper, 24... Notch on top of guide rod, 25... Link, 26... ...Interlocking shaft, 37...Spring adjustment hole, 38...Guiding groove, 39...Guiding protrusion.

Claims (1)

[Scope of utility model registration request] A bellows 9 whose internal pressure is at atmospheric pressure is inserted vertically into a pressure gas-tight casing, a guide rod 10 is stood vertically in the center of the bellows 9, and an upper part 10' of the guide rod protrudes above the sealed casing case 1, and the bellows 9 is adjusted to this upper part 10'. The screw 12 is rotatably fitted and a spring 13 is interposed between the screw 12 and the bottom surface of the bellows 9, and the adjustment screw 12 is placed in a space 14 provided in the case so as to be tightly sealed against the top surface of the case 1. A stopper is fixed to the plate 16, and a cover main body 18 is further provided on the airtight plate 16, and a lock cylinder rod 20 with an extrusion spring 21 inserted into the main body 18 is inserted horizontally so as to be freely advanced and retractable, and is provided on the lower surface of the cylinder rod 20. 2
3 and the notch 24 on the upper part of the guide rod are engaged at the specified gas pressure, and when the gas pressure decreases, the lock cylinder rod 20 is advanced, and the sliding shaft is then kept in the open state of the switch by using appropriate links and stoppers. Gas differential pressure locking device for pressure gas sealed equipment that can be locked while the circuit remains closed.