JPH0762975B2 - Structure of movable electrode part of switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention, for example, blows a gas onto an arc generated between a fixed electrode and a movable electrode part to actively extend the arc, The present invention relates to a structure of a movable electrode portion of a switch such as a puffer type switch configured to extinguish an arc.

(Prior Art) A puffer type switch has been known as a horizontal cut type switch, but the electrodes of this type of switch can be contacted and separated from a pair of fixed electrodes facing each other and one of them. And a drive mechanism for performing the opening / closing operation of the movable electrode.

(Problems to be Solved by the Invention) Since the movable electrode is configured to horizontally move between the fixed electrodes as described above, the movable electrode is smoothly moved, and its opening / closing drive is smoothly performed. Conventionally, the work of attaching the fixed electrode to the bushing and the work of attaching the bushing supporting the fixed electrode to the switch have to be fully considered for center alignment, and the assembling work is troublesome.

Configuration of the Invention (Means for Solving the Problems) The present invention has been made to solve the above problems, and includes one of a pair of fixed electrodes protruding in opposition to each other and one of both fixed electrodes. A switch provided with a movable electrode portion that slides on and off the other electrode to perform an opening and closing operation, and a drive device that performs an opening and closing operation of the movable electrode portion via a support member, The movable electrode portion includes a conductive support cylinder attached to the support member, and a pair of contacts arranged at both ends of the support cylinder so as to surround the end of the support cylinder. The support cylindrical body is provided with recessed mounting grooves on the outer peripheral surfaces of both ends thereof, and the inner peripheral surfaces of the base ends of the two contactors are provided with a protrusion having an arc-shaped cross section. The protrusion on the inner peripheral surface of the base end is arranged in the mounting groove on the one end side of the support cylinder. Rutotomoni, by being bundled both ends thereof periphery by a pair of garter springs, base end pivotably attached to one end of the support cylinder,
The distal end portion is biased inwardly so as to be slidably contactable with one fixed electrode, and the other contactor is provided with an inner periphery of the base end portion with respect to the mounting groove on the other end side of the support cylinder. The ridges of the surface are arranged and the outer peripheries of both ends are bound by a pair of garter springs, so that the base end is rotatably attached to the other end of the support cylinder, and the tip end is inside. The gist is that the structure is such that it is biased in one direction so that it can be contacted and separated from the other fixed electrode.

(Operation) With the above configuration, when the movable electrode portion is driven to be opened and closed via the drive device, the movable electrode portion comes into contact with and separates from the other fixed electrode. At this time, even if the axes of both the fixed electrodes are not aligned, the movable electrode section independently uses both the contact points as the fulcrum with the ridges on the inner peripheral surface of the base end section arranged in the mounting grooves at both ends of the support cylinder. In a state where the support cylinder is rotated and the support cylinder is tilted, one contactor maintains a sliding contact state with one fixed electrode,
The other contact fits to the corresponding other fixed electrode, and the opening / closing movement of the movable electrode is performed without any trouble.

Embodiments Embodiments in which the present invention is embodied in a gas-containing switch will be described below with reference to FIGS. 1 to 4.

As shown in FIGS. 1 and 2, through-holes 1a for bushing are transparently provided on both left and right side walls of the gas-containing switch case 1 in which an arc extinguishing gas such as SF6 is enclosed. There is.
Bushings 2 and 3 on the power supply side and the load side are penetrated through the through hole 1a, and are fixed by mounting bolts 4 via packings 5 and 6 and a bushing cover 7. An O-ring 1b is arranged in an airtight manner between the inner peripheral surface of the through hole 1a and the bushings 2 and 3.

Since the power supply side bushing 2 and the load side bushing 3 have the same structure, the load side bushing 3 will be described for convenience of explanation.

As shown in FIG. 2, locking step portions 9 are respectively provided in the inner and outer end portions of the inner cavity 8 provided through the load side bushing 3 in the axial direction.
10 is formed, and the inner end portion has an enlarged diameter portion 8a which is continuous with the inner diameter 8 and has a diameter larger than that of the inner diameter 8, and the same enlarged diameter portion.
A large diameter portion 8b having a diameter larger than that of 8a is formed. The conductive rod 11 inserted through the inner cavity 8 has a locking flange 12 which is locked on the outer end surface of the bushing 3 and is caulked around the outer end of the conductive rod 11.

A threaded portion 13 is threaded on the outer circumference of the inner end portion of the conductive rod 11, and a connection fitting 14 inserted into the enlarged diameter portion 8a and the large diameter portion 8b is screwed into the threaded portion 13. A circumferential locking projection 14a is formed at the center of the outer periphery of the connecting fitting 14.

Then, between the connecting metal fitting 14 and the locking step portion 10, the locking metal piece 15, the packing 16 and the spring washer 17 locked by the locking step portion 10 are inserted into the conductive rod 11 so as to be interposed. It Therefore, the conductive rod 11 is firmly attached by being screwed into the connecting fitting 14 so that the connecting fitting 14 and the locking flange 12 sandwich the inner and outer ends of the bushing 3.

A sealing member 18 made of an elastic material is inserted between the engaging flange 12 and the bushing 3 in the conductive rod 11,
The inner end of 18 is tightly fitted to the expanded diameter portion 8c of the outer end of the inner cavity 8. An adhesive such as an epoxy resin is applied between the sealing member 18 and the bushing 3.

Further, a buffer ring 20 is disposed outside the sealing member 18 between the locking flange 12 and the outer end surface of the bushing 3. A taper portion 12b is formed on the inner peripheral edge of the inner end surface of the locking flange 12, and an O-ring 18a is arranged between the taper portion 12b and the sealing member 18.

As shown in FIG. 3, arcuate anti-rotation ridges 21 near the outer edge of the outer end surface of the bushing 3 are provided so as to face each other, and the engaging portions are provided between the opposite end portions of both anti-rotation ridges 21. Anti-rotation protrusion 12 protruding from the outer periphery of the stop flange 12
a is involved. The packing 21a is arranged so as to cover the outer periphery of the rotation stopping protrusion 12a. A terminal 22 is fixed to the outer end of the conductive rod 11 by caulking or the like.

A rod-shaped fixed electrode 23 is attached to the inner end surface of the connection fitting 14 by screwing, and a nut 24 screwed to the outer periphery of the base end thereof is securely fixed by tightening the nut 24 on the connection fitting 14 via a spring washer 25. Has been done. A cap-shaped pressing metal fitting 26 interposed between the spring washer 25 and the connecting metal fitting 14 is inserted through the conductive rod 11. A flange is attached to the outer circumference of the tip of the holding metal fitting 26.
26a is formed, and the flange 26a and the load side bushing 3 are formed.
A slight gap is formed between the inner end faces of the.

An O-ring 27, which is locked to the locking projection 14a, is interposed between the outer circumference of the connection fitting 14 and the inner circumference of the large diameter portion 8b of the bushing 3 so as to maintain airtightness. Further, a gap regulating ring 28 is inserted between the O-ring 27 and the holding metal fitting 26 so that the narrow pressure between the bushing 3 and the connecting metal fitting 14 equalizes the circumferential pressure applied to the O-ring 27. There is.

A male fixed electrode provided on the power source side bushing 2
29 is formed to have the same outer diameter as the fixed electrode 23 of the load side bushing 3, and its length is formed to be shorter than that of the load side fixed electrode 23. As shown in FIG. 1, the fixed electrode 29 is formed with a guide hole 29a having a tip opening, and the base end of the guide hole 29a has a through hole 2 communicating with the outside.
9b is provided so that the extinguished gas introduced into the guide hole 29a is discharged to the outside of the fixed electrode 29.

The movable electrode portion 30 provided on the load side bushing 3 will be described.

The support cylinder 31 forming the movable electrode portion 30 has conductivity and is loosely inserted into the fixed electrode 23. Revolving mounting grooves 31a, 31b are provided on the outer peripheral surfaces of both ends of the support cylinder 31, and the inner peripheral surface of the support cylinder 31 is coated with an insulating synthetic resin such as polytetrafluoroethylene. Has been done. A plurality of contacts 32 are provided in a mounting groove 31a on one end side (the left end side in FIGS. 2 and 4) of the support cylinder 31.

The contactor 32 is formed by dividing a conductive cylindrical body having a base end portion having a large diameter portion and a tip portion having a small diameter portion through a tapered portion into six sections in the longitudinal direction. Further, each contact 32 has a ridge 33 having an arcuate cross-section provided on the inner circumference of the base end thereof and is rotatably arranged with respect to the mounting groove 31a.
The support cylinder 31 is attached so as to cover the base end of the support cylinder 31 by being bundled by a pair of garter springs 34 fitted on the outer circumferences of both ends. Further, the fixed electrode is provided on the inner circumference of the tip of the contact 32.
A ridge 35 is formed that is in sliding contact with 23.

Similarly, a plurality of contacts 36 are provided in the mounting groove 31b on the other end side (the right end side in the second and fourth turns) of the support cylinder 31.

That is, the contactor 36 is formed by dividing the conductive cylindrical body having the base end portion formed into the large diameter portion and the tip end portion into the small diameter portion through the taper portion into six in the longitudinal direction. Each contact 36 has a pair of garter springs, each of which has a ridge 37 having an arcuate cross-section provided on the inner circumference of the base end of the contact 36 rotatably with respect to the mounting groove 31b, and fitted on the outer circumference of both ends.
It is attached to the support cylinder 31 by being bundled at 38.
The garter spring 38 on the tip side is covered with an arc-resistant tube 38a made of polytetrafluoroethylene or the like.

Further, a ridge 39 that contacts and separates from the fixed electrode 29 on the power supply side is formed on the inner circumference of the tip of the contact 36, and an arc-resistant metal is formed at the tip.
37a is provided. A restriction ring 37b is fitted to the inner peripheral surface of the tip of each contact 36 to restrict the distance between the contacts 36 facing each other.

The support cylinder 31, the contact 32, and the contact 36 constitute a movable electrode portion 30.

The support member 40 externally fitted to the outer periphery of the support cylinder 31 is formed of a gas-proof fiber reinforced plastic having an insulating property in a bottomed cylinder shape, and is formed on the base end side from the center thereof. The support cylinder 31 is inserted into the mounting hole 40a at the bottom of the support member 40.
It is fixed integrally with the support cylinder 31 by screwing a tightening bolt 41 from the outer circumference of the support cylinder 31.

A gas communication hole 40b is provided at the bottom of the support member 40 in a transparent manner. Further, a synthetic resin orifice cone 42 having excellent arc resistance and insulation is screwed onto the inner circumference of the tip of the supporting member 40, and the nozzle 42a provided at the tip is fixed to the fixed electrode 29. It is formed so that it can be inserted. The orifice cone 42 is prevented from rotating by a set screw 42b screwed from the outer periphery of the support member 40. A pair of linking grooves 43 is provided on both sides of the supporting member 40 corresponding thereto.

A circular mounting groove 44 is provided on the outer periphery of the base end portion of the support member 40. One end of a bellows 45 is externally fitted to the mounting groove 44, and a mounting ring 46 is further externally fitted to the outer periphery of the bellows 45 so that the bellows 45 is airtightly mounted. An inner flange 45a is formed at the other end of the bellows 45, and the inner flange 45a is slidable on the outer circumference of the gap regulating ring 28 so as to be present in the gap between the inner end surface of the load side bushing 3 and the holding metal fitting 26. Has been inserted into.

The bellows 45 uses a synthetic rubber that is strong against decomposition gas of arc-extinguishing gas. C is a pressure chamber formed by being surrounded by the bellows 45 and the support member 40.

As shown in FIG. 1, a switch case 1 has a drive shaft 48 as a drive device supported rotatably at a lower position of the fixed electrode 23 so as to extend over each phase, and has a manual and automatic operation mechanism (not shown). It can be operated externally at. A swing arm 49 having a U-shaped arm portion 49a at the tip thereof is fixed to the drive shaft 48 with a bolt for each phase, and a linking protrusion 49b provided on the inner surface of the arm portion 49a is provided in the linking groove 43. On the other hand, it is engaged so that it can move slightly.

The operation of the switch configured as described above will be described.

FIG. 1 shows the open circuit state. When the drive shaft 48 is rotated in the closing direction by an external operation, the swing arm 49 is also rotated in the same direction, whereby the movable electrode portion 30, the bellows 45 via the support member 40. The orifice cone 42 is also moved in the closing direction. As a result, the contact 36 of the movable electrode portion 30 is sandwiched and contacted with the fixed electrode 29, and the bellows 45 in a contracted state as shown in FIG. 1 is extended along with the movement in the closing direction. Then, the internal pressure in the pressure chamber C decreases, so that the gas in the switch case 1 is sucked into the bellows 45 through the nozzle 42a and the gas communication hole 40b. At this time, the charging is completed.

Next, when the swing arm 49 is rotated in the open direction via the drive shaft 48 from the closed state shown by the chain line in FIG. 1 by an external operation, the support member 40 and the movable electrode linked to the swing arm 49 are moved. The part 30 and the bellows 45 are moved in the opening direction. Then, when the contact 36 of the movable electrode section 30 separates from the fixed electrode 29, an arc is generated between the contact 36 and the tip of the fixed electrode 29. At that time, when the bellows 45 is contracted as shown by the solid line in FIG. 1 and the internal pressure in the pressure chamber C rises, the bellows 45 rises.
The gas in 45 is ejected to the outside through the gas communication hole 40b of the support member 40 and the nozzle 42a of the orifice cone 42 without leaking to the outside, and the arc generated between the contact 36 and the tip of the fixed electrode 29. Spray vigorously against.

Therefore, the arc generated when the circuit is opened is expanded by the gas ejected from the bellows 45, and finally blown off and efficiently extinguished.

According to the present invention, even if the fixed electrodes 23 and 29 arranged to face each other are arranged so that their centers are displaced from each other, both contacts 32 and 36 of the movable electrode portion 30 are rotatable with respect to both ends of the support cylinder 31. Since it is attached to the
When it contacts 29, the contact 36 tilts and is smoothly inserted. Further, even if the contactor 36 on the tip end side is sufficiently inserted into the fixed electrode 29 and the support 31 tilts, the contactor 32 on the base end side.
Follows, so that the contact between the contact 32 and the fixed electrode 23 is sufficiently fixed. Further, even if the electrode section 30 is moved open thereafter, the movable electrode section 30 also moves smoothly.

EFFECTS OF THE INVENTION As described in detail above, even if the axes of both fixed electrodes are not coincident with each other, the movable electrode has two positions, that is, the base end portion of one contactor and the base end portion of the other contactor. Acts as a pivot
When absorbing the axial misalignment, only the support cylinder tilts, and the contacts at both ends of the support cylinder are located coaxially with the axis of the corresponding fixed electrode and conform to the fixed electrode. The opening and closing movement of parts can be performed without any problems. Moreover, since the base end portion of the contactor is bundled by the garter spring in a state where the protrusion on the inner peripheral surface is arranged in the mounting groove on the outer peripheral surface of the support cylinder, the contact relationship between the mounting groove and the protrusion is There is no risk that the pivot will shift. Therefore, the movable electrode part that has been closed and opened is smoothly moved, and the opening and closing drive is smoothly performed.Therefore, the work of attaching the fixed electrode to the bushing and the work of attaching the bushing that supports the fixed electrode to the switch are simple. This is an invention that is excellent in industrial use because it can be performed and the assembling work can be easily performed.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an open state of a switch embodying the present invention, FIG. 2 is a cutaway sectional view of a load side bushing and a movable electrode portion, FIG. 3 is a side view of an outer end of the bushing, and FIG. The figure is a cross-sectional view of the movable electrode portion. 1 ... Switch case, 2
...... Power supply side bushing, 3 …… Load side bushing, 23,2
9: Fixed electrode, 30: Movable electrode part, 31: Support cylinder, 3
2,36 …… Contactor, 45 …… Bellows, 48 …… Drive shaft, 49…
… Swing arm.

Front page continued (72) Inventor Hiromitsu Ito No. 1 Kamikonee, Inuyama, Aichi Prefecture Takamatsu Denki Seisakusho Co., Ltd. U) Actual development 52-78764 (JP, U) Actual development 48-102555 (JP, U)

Claims (1)

[Claims] 1. A pair of fixed electrodes, which are provided so as to face each other, a movable electrode portion which is slidably contacted with one of the fixed electrodes and is opened and closed with respect to the other fixed electrode, and a supporting member. A switch provided with a drive device for performing an opening / closing path operation of the rotating electrode section via a movable support, the movable electrode section being a conductive support cylinder attached to the support member, and the support cylinder. And a pair of contacts disposed at both ends of the support cylinder so as to surround the end of the support cylinder, and at the outer peripheral surfaces of both ends of the support cylinder, there are formed mounting grooves that circulate. Protrusions having an arc-shaped cross section are provided on the inner peripheral surfaces of the base ends of both contacts, and one contact is provided with a protrusion on the inner peripheral surface of the base end with respect to the mounting groove on the one end side of the support cylinder. At the same time, the outer circumferences of both ends are bundled by a pair of garter springs, so that the base end is The holding cylinder is rotatably attached to one end of the holding cylinder, and the tip end portion is biased inward so as to be slidably contactable with one fixed electrode, and the other contact is the supporting cylinder. A ridge on the inner peripheral surface of the base end portion is arranged in the mounting groove on the other end side of the body, and the outer peripheries of both end portions are bundled by a pair of garter springs, so that the base end portion is The structure of the movable electrode part of the switch is characterized in that the movable electrode part is rotatably attached to the end part, and the tip part is urged inward so that it can be brought into contact with and separated from the other fixed electrode. .