JP2001273844A - Arc extinguishing device of gas-blowing type by rotary- buffer method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an arc extinguishing device by blowing compressed arc- extinguishing gas against the arc generated between both electrodes at the time of making or breaking an electric circuit, by devising a nozzle-guide for the extinguishing gas without impairing the flow-velocity and the flow-rate particularly in the neighborhood of the arc-generating area of the movable electrodes, making an arc extinguishing device of a gas-blowing type by a rotary-buffer method smaller, and in turn, enabling the size of the making- and breaking-switching device to be smaller as a whole. SOLUTION: A nozzle-guide 27 is integrally fixed to a movable electrode, and the nozzle guide is constituted by a guide part 27b formed widening forward in a trumpet- like shape from the movable electrode in an arc-extinguishing room to gather compressively the arc-extinguishing gas found forward from the movable electrode in the arc-extinguishing room, the gas-constructing part 27d narrowing the passage of the flow of the gas collected in the guide part 27d so as to increase the arc-extinguishing gas flow velocity in the neighborhood of the arc-generating area, and further a releasing part 27e forming a widened trumpet-like shape backwards to release the gas-flow backwards which is passed through the gas-flow constructing part 27d.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a rotary puffer type gas blowing type arc extinguishing device, and more particularly to a nozzle guide which can perform gas blowing efficiently.

[0002]

2. Description of the Related Art As a conventional rotary puffer type gas blowing type arc extinguishing apparatus and its nozzle guide, there are those having the constructions shown in FIGS.

FIG. 23 shows a closed (closed) state of a switch. When an open / close operation handle (not shown) is opened, the open / close shaft 100 rotates counterclockwise, and the movable electrode 101 integrated with the open / close shaft 100 is turned. The electric path is opened at once from the fixed electrode 104. In this case, when the movable electrode is separated, arc discharge occurs between the movable electrode and the fixed electrode. However, SF ₆ gas (arc-extinguishing gas) in each of the arc-extinguishing chambers 102 and 103 on the power supply side and the load side.
Nozzle guide 1 in which 106 rotates together with movable electrode 101
Is compressed by 05 of the guide portion 105a, further compressed gas is guided to the arc further through the nozzle portion 105b SF ₆ which then blow out the arc, extinguishing is completed,
The gas 106 is discharged out of the housing 107 (inside of the case) through the circulation ports 107a and 107b.

When the switch in the open state shown in FIG. 25 is closed (closed), the operation is the reverse of the above operation. That is, in the open state of FIG. 25, when the opening / closing shaft 100 is rotated clockwise by operating the handle, the movable electrode 101 approaches the fixed electrode 104 and is closed, and the electric circuit is closed. At the time of closing (closing), the arc-extinguishing chambers 102 and 103 on the power supply side and the load side enter a pseudo vacuum (decompression) state because the movable electrode 101 rotates clockwise at once.
The SF ₆ gas 106 in the case is blown to the arc of the preceding discharge generated between the two electrodes via the circulation ports 107 a and 107 b of the housing 107, the arc extinguishing chambers 102 and 103, and the nozzle portion 105 b of the nozzle guide 105, Is extinguished. Note that, at the time of this injection (closed circuit), a preceding discharge occurs between the two electrodes as described above, but since the movable electrode 101 is immediately injected into the fixed electrode 104, the time of the preceding discharge becomes extremely short, and the movable electrode 101 is almost completely discharged. It is supplied to the fixed electrode 104 without being affected.

[0005]

The conventional rotary puffer type gas spraying type arc extinguishing device includes a nozzle guide 105 which rotates integrally with the movable electrode 101 and a power source side and a load side arc extinguishing chamber. In preparation. When the electric circuit is opened, the nozzle guide 105 compresses the SF ₆ gas 106 located in the arc-extinguishing chambers 102 and 103 in front of the movable electrode 101 by the guide portion 105a, and the movable electrode 101 and the fixed electrode 1 are compressed.
The compressed SF ₆ gas 10
6 is extinguished by blowing from the nozzle portion 105b.

However, as described above, the nozzle guide 105 has a guide portion 105a and a nozzle portion 10 for compressing while collecting the arc-extinguishing gas in the arc-extinguishing chamber as shown in FIG.
5b are in a right angle positional relationship, and the nozzle portion 105
Since the base 105c of b is formed to protrude forward, the gas flow is disturbed at the time of spraying, the flow velocity and the flow rate are reduced, and the gas blowing efficiency (arc extinguishing performance) for the arc is reduced. I was invited. This tendency became remarkable especially when the volume of the arc-extinguishing chamber was reduced for miniaturization.

The present invention proposes to solve the technical problem at the time of blowing gas generated in the conventional nozzle guide.

[0008]

According to a first aspect of the present invention, when a movable electrode is separated from a fixed electrode, the movable electrode is turned off by a nozzle guide with opening of the movable electrode. A gas blowing type arc extinguishing device of a rotary puffer method, wherein an arc extinguishing gas in an arc chamber is compressed, and the compressed arc extinguishing gas is blown against an arc generated between both electrodes to extinguish the arc. The nozzle guide is integrally fixed to the movable electrode, and the nozzle guide is formed in a trumpet shape toward the front for compressing and collecting the arc-extinguishing gas located in front of the movable electrode in the arc-extinguishing chamber. A widened guide portion, a gas throttle portion formed with a narrow gas flow passage so that the flow rate of the arc-extinguishing gas collected by the guide portion increases near the arc portion of the movable electrode, After the gas flow through the gas throttle A rotary puffer gas blowing type extinguishing apparatus of a type which is characterized by being configured by the emitting portion widening formed in a trumpet shape towards the rear in order to release the.

According to the nozzle guide of the first invention,
When the electric circuit is opened, the flow velocity and the flow rate of the gas flow increase near the arcing portion of the movable electrode, so that the arc-extinguishing gas is efficiently blown to the arc, so that reliable arc extinguishing can be expected.

[0010] The second invention is the above-mentioned first invention,
The width of the guide portion of the nozzle guide is substantially equal to the width of the arc-extinguishing chamber.

According to the present invention, when the arc-extinguishing gas located in the arc-extinguishing chamber is compressed by the guide portion of the nozzle guide, the gas can be surely compressed without gas leakage, so that the gas blowing is more efficient. Can be done.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the embodiments shown in FIGS.

The cased switch 1 shown in FIGS. 1 to 22
Are used as switches for sectioning extra high voltage or high voltage distribution lines.

In FIG. 1, reference numeral 2 denotes a metal plate such as stainless steel.
Box-shaped case, which includes a side wall 2 on the power supply side.
u₁, 2v₁, 2w₁And load side wall 2u_Two, 2v_Two,
2w _TwoAre formed facing each other. In addition, located in the center
Side wall 2v₁, 2v_TwoOn the side adjacent to both sides
Wall 2u₁, 2w₁And 2u_Two, 2w_TwoIs 150 degrees each
Is formed to be inclined at the inner angle of.

The power supply side walls 2u ₁ , 2v ₁ , 2w ₁
Are provided with bushings 4u ₁ , 4v ₁ , 4w ₁ on the power supply side, and side walls 2u ₂ , 2v ₂ , 2w ₂ on the load side are provided with bushings 4u ₂ , 4v ₂ , 4w ₂ on the load side. I have. The bushings 4v ₁ and 4v ₂ located at the center are V-phase bushings, bushings 4u ₁ and 4u ₂ adjacent to one side are U-phase bushings, and bushings 4w ₁ adjacent to the other side. , 4w ₂ are W-phase bushings.

Further, as described above, the side wall 2u₁, 2w₁Passing
And 2u_Two, 2w_TwoIs the central side wall 2v ₁, 2v_TwoAgainst
Due to the inclination, the V-phase bushing 4v₁, 4
v_TwoU-phase and W-phase bushings arranged on both sides
As shown in FIG. 1, it is arranged at an angle, outside the bushing of each phase.
Wire connection terminal 3u provided at the tip of the part₁, 3v₁, 3w₁Passing
And 3u_Two, 3v_Two, 3w_TwoThe distance between each other is
2 is larger than the penetrating portion side.

Each of the bushings 4u ₁ , 4v ₁ , 4w ₁ and 4u ₂ , 4v ₂ , 4w ₂ is fixed to the case 2 by fixing a flange 6 provided on the bushings to each of the side wall portions by mounting screws 7. .

5u ₁ , 5v ₁ , 5w ₁ and 5u ₂ , 5v
₂ and 5w ₂ are terminal connection parts, and bushings 4u ₁ and 4u 2
The center conductor (not shown) fixedly inserted through v ₁ , 4w ₁ and 4u ₂ , 4v ₂ , 4w ₂ is fixed to the inner side end of the case.

Reference numeral 8 denotes one side wall 2 in a direction orthogonal to the axis of the V-phase bushings 4v ₁ and 4v ₂ disposed at the center.
a safety valve of the protection device provided in the rupture plate 9, the guide blade 1
0, a protective cap 11, and a mounting screw 11a. The pressure release port 2c of the case 2 is normally closed by the rupturable plate 9, and a short circuit occurs inside the case due to the intrusion of an abnormal voltage such as lightning, and the internal pressure of the case rapidly increases. When the pressure rises, the rupturable plate 9 is pushed outward by the pressure and ruptured by the guide blade 10, and the pressure is immediately released to the outside of the case to prevent the case from exploding.

The side wall 2 on the side facing the one side wall 2a
The b part, the bearing 12 with the bearing hole 2d is formed with axial in the direction perpendicular to the axis of the bushing 4v _1, 4v ₂ of the V-phase are fixed, the bearing hole 2
d, a handle shaft 14 is rotatably penetrated through the bearing 12. An opening / closing operation handle 13 arranged in a direction perpendicular to the handle shaft 14 is fixed to an end of the handle shaft 14 outside the case.
A connection mechanism 14a formed of a U-shaped groove having an open end face is formed at the inner end of the case.

Reference numeral 15 denotes a unit-type opening / closing section having an opening / closing mechanism. The opening / closing section 16 and the opening / closing mechanism section 30 are integrally assembled coaxially. And the opening / closing mechanism 30 are assembled in advance, and in this assembled state, it is attached to the inside 2 e of the case.

The opening / closing portion 16 has an outer periphery shown in FIGS.
And a cylindrical housing 18 as shown in FIG. The housing 18 is formed of, for example, a synthetic resin having electrical insulation such as a transparent acrylic resin, and has a gutter-like divided body 18c, 1 divided into two in a cross section.
8d are connected to be dividable.

In the housing 18, there is an axial center.
An opening / closing shaft 19 is provided, and the opening / closing shaft 19 is
As shown in FIG.₁,
18 _FourIs rotatably fitted and supported. Open / close shaft 19
Is a pipe coated with a coating agent such as silicone resin on the surface
It is formed of a reinforced resin such as a FRP.

The peripheral wall of the housing 18 and the open / close shaft 1
As shown in FIG. 15, the space with the partition wall 9 is provided with partition walls 18 ₁ , 18 ₂ , 18 provided at substantially equal intervals in the axial direction of the housing 18.
_3, 18 ₄ are divided into three parts in the axial direction by, U-phase arcing chamber 1
8u ₁ , 18u ₂ and V-phase arc extinguishing chambers 18v ₁ , 18v ₂ and W
The arc extinguishing chambers 18w ₁ and 18w ₂ are divided into three chambers, and the arc extinguishing chambers for each phase are divided into two in the circumferential direction (the rotation direction of the opening / closing shaft 19) as shown in FIG. is partitioned by two partition walls 20, 20 of a radial, U-phase arcing chamber is partitioned from the supply-side arc extinguishing chamber 18 u ₁ to the load side arc extinguishing chamber 18 u _2, power V-phase arcing chamber It is defined as the side arcing chamber 18v ₁ to the load side arc extinguishing chamber 18v _2, W-phase arcing chamber is partitioned from the supply-side arc extinguishing chamber 18w ₁ to the load side arc extinguishing chamber 18w _2. The partition walls 18 ₁ , 18 ₂ , 18 ₃ , 18 ₄ and 20 are formed of an electrically insulating synthetic resin.

FIG. 1 shows the outer surface of the housing 18 on the power supply side.
Power source side insulating terminal mount 21 ₁ is fixed as shown in,
Load-side insulating terminal mounting block 21 ₂ is fixed to the load-side outer surface.

[0026] The power source-side insulating terminal mount 21 _1, U
Phase connection and terminal 23u ₁ and V-phase connection terminal 23v ₁ and W-phase connection terminal 23w ₁ is attached by screws 22, the inner end of the respective connection terminals 23u _1, 23v _1, 23w ₁ extends through the housing 18 It protrudes into the arc-extinguishing chamber on the power supply side. Furthermore, the load-side insulating terminal mounting block 21 _2, U-phase connection terminal 23u ₂ and V-phase connection terminal 23v ₂ and W-phase connection terminal 23w ₂ is attached by screws 22, each of said connecting terminals 23u _2, 23v _2, the inner end of 23w ₂ is entered the extinguishing chamber of the load side through the housing 18.

The connection terminals 23u ₁ , 23v ₁ , 23
also referred to as w ₁ and 23u _2, 23v _2, the fixed electrode 24u ₁ inner Each clip forms the end of 23w _3, 24v _1, 24w ₁ and _{24u 2, 24v 2, 24w 2} ( fixed electrode 24 collectively these ) Are fixed (FIGS. 10 to 12).
And FIG. 15).

As shown in FIG. 15, the opening / closing shaft 19 has
The U-phase, V-phase, and W-phase fixed electrodes 24u ₁ , 24v ₁ ,
At three positions corresponding to 24w ₁ and 24u ₂ , 24v ₂ , 24w ₂ , the movable electrode 25 of the blade type is
It penetrates in the direction orthogonal to the opening and closing shaft 19 and is fixed.
When the opening / closing shaft 19 is rotated counterclockwise in FIG. 10, the movable electrode 25 is also integrally rotated in the same direction, and the contact portions 25a, 25b at both ends of the movable electrode 25 are connected to the power supply side fixed electrodes 24u ₁ , 24v. ₁ , 24w ₁ and fixed electrode 2 on the load side
4u ₂ , 24v ₂ , open the circuit away from 24w ₂ ,
Conversely, when the open / close shaft 19 is rotated clockwise, the electric circuit is closed.

At both ends of the movable electrode 25, nozzle guides 27, 27 made of an electrically insulating synthetic resin such as polyacetal resin are fixed.

The nozzle guide 27 is shown in FIGS.
As shown in FIG. 7, a support hole 27a is formed at the center of the support electrode 27a, and the support hole 27a is fitted to the distal end of the movable electrode 25 and the distal ends of the contact portions 25a and 25b are slightly viewed. Are fixed to the movable electrode 25 with a pin or a pin and an adhesive.

On both sides of the nozzle guide 27, the arc guides 18u ₁ , 18u ₂ , 18v ₁ , 18v ₂ , 18w are rotated by rotating the nozzle guide 27 when the electric circuit is opened.
_The guide portions 27b, 27b are extended forward so as to collect SF ₆ gas (arc-extinguishing gas) 26 in front of the movable electrode in the _first and 18w ₂ to the movable electrode 25, and the guide portion 27b. The converging section 2 which is narrowed behind the guide sections 27b, 27b so that the collected SF ₆ gas 26 increases the flow velocity and flow rate near the arc portion of the movable electrode 25.
7d and a discharge portion 27e which is slightly open toward the rear in a trumpet shape are formed in series, and the rear surface 27f of the bottom surface 27f is inclined outward in the radial direction. That is, as shown in FIG. 18, wide inlet width a of the SF ₆ gas as a rotation front side of the time path open rear end of the support hole 27a, i.e., SF in the vicinity of arcing portion of the movable electrode 25 ₆ Gas passage 27c
The width g of the SF ₆ gas in the passage 27 c is increased by the rotation of the nozzle guide 27.

Further, the above-mentioned nozzle guide 27 is
As shown in FIGS. 12 to 15 and FIG. 15, two nozzle guides 27 on the power supply side and the nozzle guide 27 on the load side are attached to one (one-phase) movable electrode in an upside-down positional relationship. .

Further, the width a of the nozzle guide 27 is
As shown in FIG. 15, the arc extinguishing chamber 18u of the housing 18 is provided.
₁, 18u_Two, 18v₁, 18v_Two, 18w₁, 18w
_TwoIs formed so as to fill the width b.
When the nozzle guide 27 rotates, the guide portion 27
b, 27b and partition wall 18₁~ 18_FourSF from the gap with
₆Gas leakage is extremely reduced, SF inside the arc-extinguishing chamber₆gas
And efficiently distribute it in a concentrated manner in the passage 27c.
It has become.

In the housing 18, the movable electrode 25 is opened from the positions of the fixed electrodes 24u ₁ , 24v ₁ , 24w ₁ on each of the arc extinguishing chambers 18u ₁ , 18v ₁ , 18w ₁ on the power supply side. On the opposite side to the direction, a power supply side communication port 18a is formed. Similarly, each of the load side of the arcing chamber 18 u _2, 18v _2, also each 18w _2, the load side stationary electrode 24u _2, 24v _2, 24w movable electrode 2 from the position of the ₂
5 on the side opposite to the open side direction,
Are formed.

As shown in FIGS. 1, 2 and 22, the opening / closing mechanism 30 is integrally provided at one end in the axial direction (longitudinal direction) of the opening / closing section 16, and is shown in FIG. As described above, the flange portion 18d of the housing 18 on the opening / closing section 16 side is fixed to the mounting frame 38 on the opening / closing mechanism section 30 side with the screw 45.

In FIG. 22, a connecting pin 39 is erected and fixed transversely to an end of the opening and closing shaft 19 on the opening and closing mechanism 30 side. An electrode direct drive lever 31 is rotatably provided in the mounting frame 38 on the opening / closing mechanism 30 side, and the cylindrical portion 31b has a U-shaped open end.
A connection groove 31c is formed, and by fitting the connection pin 39 into the connection groove 31c, the opening / closing shaft 19 and the electrode direct drive lever 31 are directly connected to rotate integrally in the circumferential direction. Has become.

The cylindrical portion 31 of the electrode direct drive lever 31
A part 32c of a tubular handle direct drive lever 32 is rotatably loosely fitted on the inner peripheral side of b, and a connecting pin 40 is fixed to the handle direct drive lever 32 in a transverse manner. The handle shaft 14 of the operation handle 13 is fitted into the tubular handle directly-coupled drive lever 32, and a U-shaped connection groove 14 a is formed at the inner end of the handle shaft 14. The connecting pin 4 is inserted into the groove 14a.
By fitting 0, the handle shaft 14 and the handle direct drive lever 32 are directly connected, and both are integrally rotated in the circumferential direction.

As shown in FIG.
As shown in FIG. 22, a latch portion 31a is integrally formed, and the handle direct drive lever 32 is integrally formed with a latch portion 32a.

A collar 41 made of synthetic resin is fitted on the outer periphery of the cylindrical portion 32d of the handle direct drive lever 32, and a power storage spring 33 composed of a coil spring is wound around the outer periphery of the collar 41. As shown in FIG.
3a is locked to the opening side end of the locking portion 31a of the electrode direct drive lever 31 and the locking portion 32a of the handle direct drive lever 32, and the other end 33b is connected to the electrode direct drive lever 31.
And the electrode direct drive lever 31 is locked and stopped in a state in which the electrode direct drive lever 32 is locked and stopped. Hook 32a
Spring 33 is rotated in the opening direction (the direction of the arrow).
The force for moving the other latching portion 31a in the opening direction (the direction of the arrow) is accumulated, and the latching portion 32a of the handle direct coupling driving lever 32 in a state where the electrode direct coupling driving lever 31 is locked and stopped. Is rotated in the closing direction, the storage spring 33 is attached to the other retaining portion 31a.
Is set so as to accumulate a force for moving the in the closing direction. That is, both ends 33a, 33b of the storage spring 33
Are locked on opposite sides of the rotation direction with respect to the both hooking portions 31a and 32a, respectively.

As shown in FIG. 21, the mounting frame 38 is provided with an opening side latch 34 and a closing side latch 35 so as to be rotatable by support shafts 34a and 35a, respectively.
The engaging portions 34b and 35b are always urged inward.

The electrode direct drive lever 31 is provided with one locking portion 31b. As shown in FIG. 21A, when the open side latch 34 is locked to the lock portion 31b, the electrode direct drive lever 31 is locked. The rotation of the opening 31 in the opening direction is locked. Further, the other end of the electrode direct drive lever 31 is formed on the electrode direct drive lever 31, and as shown in FIG. The rotation in the closing direction is locked.

The handle-direct drive lever 32 has an open-side pressing portion 32 d and a closing-side pressing portion 3
2f are formed so as to protrude radially from the outer peripheral surface of the electrode direct drive lever 31. When the handle direct drive lever 32 is rotated to near the end of opening as shown in FIG. The pressing portion 32d is the release side latch 3
When the drive lever 32 is disengaged from one of the locking portions 31b and the handle direct drive lever 32 is rotated to near the end of closing as shown in FIG. 1A, the closing side pressing portion 32f causes the closing side latch 35 to move the closing side latch 35 to the other side. It is detached from the locking portion 31e.

In FIGS. 2, 3, and 22, a support frame 42 rotatably supports the end 32e of the cylindrical portion 32d of the handle direct drive lever 32 and prevents the collar 41 from falling off. It is fixed to the mounting frame 38 with screws. In FIG. 22, reference numeral 43 denotes a bearing metal interposed between the levers 31 and 32, and reference numeral 44 denotes an electrode direct drive lever 31 and the mounting frame 3.
8 shows a bearing metal interposed between the eight.

As shown in FIG. 3, the handle shaft 14 of the opening / closing operation handle 13 penetrates the side surface 2b of the case 2 via the metal 56, and the bearing shaft 12 fixed to the case 2 It penetrates through the ring 55 and the metal 56, and penetrates airtightly to the case. After the handle shaft 14 is inserted into the case 2, a flat washer or a collar 46 with a flange is fitted around the handle shaft 14 to prevent the handle shaft 14 from coming off. Further, the collar 46 with the collar and the handle shaft 14 are fixed by a pin 47 such as a knock pin or a split pin.

In FIG. 1, the power supply side bushing 4u
Terminal connection parts 5u ₁ , 5u of each phase of ₁ , 4v ₁ , 4w ₂
v ₁ , 5 w ₁ and the connection terminal 23 on the power supply side of the opening / closing section 16
u _1, 23v _1, 23w between ₁ flexible conductor 50u ₁ 50v
₁ , 50 w ₁ are electrically connected.

Similarly, load side bushings 4u ₂ , 4u
v _2, each phase of the terminal connection portions of _{4w 2 5u 2, 5v 2,} 5w
₂ and connection terminals 23 u ₂ , 23 u on the load side of the switchgear 16.
Flexible conductors 50u ₂ , 50v ₂ , 50 between v ₂ and 23w ₂
It is electrically connected in w _2.

The flexible conductors 50u ₁ , 50v ₂ , 50w
_{2, 50u 2, 50v 2,} 50w 2 are electrically connected by bolts 52 and nuts 53 as shown in FIGS. 4 and 5. Further, as the flexible conductor, as shown in FIG. 6, a plurality of thin conductive plates having mounting holes 50a formed at both ends are stacked so as to secure a predetermined conduction capacity,
A flat knitted wire or a stranded wire made of a thin wire or the like can be used, and further, an annealed copper plate can be used. Further, as shown in FIG. 7, the bolts 5 such as elongated holes or stupid holes 54a are provided at both ends.
The mounting hole 54a in which the mounting position where the 2 is loosely fitted can be adjusted may be formed. FIG. 7 shows a conductive plate 54 made of an annealed copper plate on which such a connection-adjustable mounting hole 54a is formed.

Next, an assembling method will be described.

First, the lid 51 shown in FIGS. 8 and 9 is removed, and in this state, the handle shaft 14 is attached to the side surface 2 b of the case 2.
Of the operating handle 13 with a flat washer, a collar 46 and a pin 47 inside the case.
To the case 2 in a rotatable manner.

Further, both side walls 2 on the power supply side and the load side
u₁, 2v₁, 2w₁And 2u_Two, 2v_Two, 2w_TwoTo
And the bushing 4u of each phase of U, V, W₁, 4v₁, 4
w₁And 4u _Two, 4v_Two, 4w_TwoWith the mounting screw 7
Assemble.

Next, the unit-type opening / closing section 15 having a unit-type opening / closing mechanism separately assembled and prepared outside the case 2 is arranged such that the opening / closing mechanism section 30 faces the opening / closing operation handle 13, and the power supply side and the load side. Terminal connection portions 5u ₁ , 5v ₁ , 5w ₁ and 5u ₂ , 5v at the inner end of each bushing.
_2, disposed between 5w _2, against the mounting frame 38 of the switching mechanism 30 to the side wall 2b of the case 2. At this time, the connection pin 4 provided integrally with the handle direct drive lever 32
0 is fitted into the connection groove 14a of the handle shaft 14, and the handle direct drive lever 32 and the handle shaft 14 are integrally connected in the rotation direction. Thereby, the handle shaft 14 and the opening / closing shaft 19 are mechanically connected via the opening / closing mechanism 30 so as to rotate integrally.

Then, the mounting frame 38 on the opening / closing mechanism 30 side is inserted into a bolt 47 having its mounting hole 38 b protruding from the inner surface of the case 2, and is fixed to the side surface 2 b of the case 2 with a screw 37.

Next, the bushings of each phase fixed to case 2
Terminal connection part 5u₁, 5v ₁, 5w₁And 5u
_Two, 5v_Two, 5w_TwoAnd fix it in case 2 as above
Connection terminal 23u of each phase of the opening / closing section 15 with the opening / closing mechanism₁,
23v₁, 23w₁And 23u_Two, 23v_Two, 23w_Two
Between flexible conductor 50u₁, 50v₁, 50w₁And 5
0u_Two, 50v_Two, 50w_TwoWith bolt 52 and nut
53 are electrically connected.

Next, after the cover 51 is attached and the inside of the case 2 is evacuated, the case 2 is filled with SF ₆ gas 26 as an arc-extinguishing gas until a predetermined amount or a predetermined pressure is reached, and the adsorbent is filled. The case 2 is airtightly processed to complete the assembly. FIGS. 8 and 9 show the appearance of the assembled state.

Next, the operation of the opening / closing mechanism will be described with reference to FIG.

FIG. 21A shows a closed (closed) state of the switch.

From the state shown in FIG. 21 (a), the opening / closing operation handle 13 is opened to operate the handle direct drive lever 3
When the handle 2 is rotated in the counterclockwise direction, the locking portion 32 a of the handle direct drive lever 32 is moved to one end 33 of the energy storage spring 33.
a is rotated counterclockwise in the figure. At this time, since the electrode direct drive lever 31 is locked by being prevented from rotating counterclockwise by the open side latch 34, the other end 33 b of the energy storage spring 33 is locked by the locking portion 31 a of the electrode direct drive lever 31. Does not move. Therefore, the storage spring 33
Is wound and stored.

Further, the handle direct drive lever 32
Is rotated in the counterclockwise direction, and its open side pressing portion 32d is
1 (c), the engaging portion 34b of the open side latch 34
, The engaging portion 34b is pushed outward by the open-side pressing portion 32d, and is disengaged outward from the locking portion 31b.
The lock of the electrode direct drive lever 31 is released. When the lock is released in this manner, the electrode direct drive lever 31 is rotated at once in the counterclockwise direction in the drawing by the spring force stored in the storage spring 33. With this rotation, the lever 3
The opening / closing shaft 19 directly connected to 1 also rotates in the opening direction at a stroke, and the movable electrode 25 is separated from the fixed electrode 24 from the closed state in FIG. 10, and becomes the open state in FIG. 12 through the state in FIG. Open.

When the release is completed as described above, FIG.
As shown in (d), the electrode direct drive lever 31 has a locking portion 31b locked to the stopper 36 on one side thereof to prevent excessive rotation, and the other locking portion 31e engages the closing side latch. 35 is locked and locked.

FIG. 21A shows a closed state, and FIG.
Indicates a power storage operation, (c) indicates an open operation, and (d) indicates an open state.

Next, a description will be given of a case where the circuit is closed (closed) from the open (opened) state.

In the open state of FIG. 21D, the operating handle 13 is turned in the closing direction opposite to the above to perform the closing operation.
By this closing (closing) operation, the handle direct drive lever 32 directly connected to the handle shaft 14 rotates clockwise, contrary to the above-described opening. By this rotation, the locking portion 32 a of the handle direct drive lever 32 is moved to the other end 3 of the energy storage spring 33.
3b is rotated clockwise in the figure. At this time, since the electrode direct drive lever 31 is locked by being prevented from turning clockwise by the closing side latch 35, the power storage spring 3 is locked.
The one end 33a of 3 is locked by the latch portion 31a of the electrode direct drive lever 31 and does not move. Therefore, the storage spring 33
Is wound and stored.

Further, the drive lever 3 directly connected to the handle
2 rotates clockwise, and when the input side pressing portion 32f reaches the engaging portion 35b of the input side latch 35, the engaging portion 35
b is pushed outward by the input-side pressing portion 32f to be released outward from the locking portion 31e, and the lock of the electrode direct drive lever 31 is released. When the lock is released in this manner, the electrode direct drive lever 31 is simultaneously rotated clockwise in the drawing by the spring force stored in the storage spring 33. With this rotation, the opening / closing shaft 19 directly connected to the lever 31 also rotates at once in the closing direction, and from the open state of FIG. 12, the movable electrode 25 moves at once through FIG. 11 to the fixed electrode as shown in FIG. 24, and the electric circuit is closed.

When the charging is completed as described above, FIG.
As shown in (a), the electrode direct drive lever 31 has the other locking portion 31e locked by the stopper 36 to prevent excessive rotation, and one of the locking portions 31b has an open side latch. 34 is locked and locked.

Next, the arc extinguishing operation at the time of opening and closing will be described.

When the opening / closing operation handle 13 is opened from the closed state as described above, the movable electrode 25 is rotated in the direction of the arrow from the closed state in FIG. The fixed electrode 2 of the movable electrode 25
At the time of separation from the electrode 4, an arc discharge occurs between the electrodes 24 and 25.

At this time, each of the arc-extinguishing chambers 1 on the power supply side and the load side is used.
8u ₁ , 18v ₁ , 18w ₁ and 18u ₂ , 18v ₂ ,
The SF ₆ gas 26 in 18w ₂ is collected while being compressed by the guide portion 27b which is opened forward like a trumpet in the nozzle guide 27 which rotates together with the movable electrode 25, and is further narrowed down by the throttle portion 27d. In the passage 27c, the flow rate and flow rate of the SF ₆ gas 26 are increased, and the gas flow having the increased flow rate and flow rate is applied to the arc portion 2 of the movable electrode 25.
The arc generated in the vicinity of 5c is blown all at once, and the arc is blown out. Thereafter, the arc is emitted from the emission part 27e which is gently expanded in a trumpet shape backward and extinguished. The SF ₆ gas blown out of the arc is then supplied to the circulation ports 18a, 18
b to the outside of the housing 18 (inside of the case 2).

Further, from the open state shown in FIG. 12, the opening / closing operation handle 13 is operated as described above to move the movable electrode 2.
12 is turned clockwise at a stroke from FIG.
Power supply side and the arc extinguishing chamber on the load side 18u _1, 18v _1, 18
The inside of w ₁ and 18u ₂ , 18v ₂ , 18w ₂ is in a quasi-vacuum (decompressed) state due to the rapid clockwise rotation of the movable electrode 25, and the SF ₆ gas 26 in the case 2 flows through the flow port
a, 18b to enter each arc extinguishing chamber and the nozzle guide 2
The arc generated between the electrodes 24 and 25 is blown through the arc 7, and the arc is extinguished. In addition, at the time of this injection (closed circuit), a precedent discharge occurs between both electrodes 24 and 25,
Since the movable electrode 25 is immediately supplied to the fixed electrode 24,
The time of the predischarge becomes extremely short and is hardly affected, and the movable electrode 25 is supplied to the fixed electrode 24.

[0069]

According to the first aspect of the present invention, when the electric circuit is opened, the gas flow velocity and the flow rate increase near the arcing portion of the movable electrode, so that the arc-extinguishing gas is efficiently blown to the arc. It can be expected that the arc will be extinguished. This makes it possible to reduce the volume of the arc-extinguishing chamber and to downsize the entire switch.

According to the second aspect of the present invention, since the arc-extinguishing gas located in the arc-extinguishing chamber can be compressed without leaking by the guide portion of the nozzle guide, the gas blowing efficiency can be further improved. The arc extinguishing performance can be further improved.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, and is a plan view showing an assembled state of a cased switch before a cover is attached.

FIGS. 2A and 2B show a unit-type opening / closing unit with an opening / closing mechanism in FIG. 1, wherein FIG. 2A is a plan view and FIG. 2B is a bottom view in FIG.

FIG. 3 is a partial cross-sectional view showing a connection state between an opening / closing operation handle and an opening / closing mechanism.

FIG. 4 is a plan view showing a connection state of a flexible conductor.

FIG. 5 is a side view showing the connection state.

FIG. 6 is a perspective view of a flexible conductor.

FIG. 7 is a perspective view of a conductive plate as another example of a flexible conductor.

FIG. 8 is a side view of the cased switch in the assembled state as viewed from the handle side.

FIG. 9 is a side view similarly viewed from the bushing side.

FIG. 10 is a cross-sectional view for explaining an arc extinguishing operation and showing a closed (closed) state of a U-phase.

FIG. 11 is a cross-sectional view showing a U-phase opening halfway state.

FIG. 12 is a sectional view showing an open (open circuit) state of the U-phase.

FIG. 13 is a front view of a movable electrode.

FIG. 14 is a plan view showing a state where an opening / closing shaft, a nozzle guide, and a movable electrode are assembled.

FIG. 15 is a plan sectional view showing an assembled state of the opening / closing section.

FIG. 16 is a perspective view of a nozzle guide.

FIG. 17 is a front view of the nozzle guide.

FIG. 18 is a plan view of the same.

FIG. 19 is a side view of the same.

FIG. 20 is a perspective view of a nozzle guide attached to a movable electrode.

FIGS. 21A and 21B are schematic structural views for explaining the operation of the opening / closing mechanism, wherein FIG. 21A is a closed state, FIG.
Indicates an open operation, and (d) indicates an open state.

FIG. 22 is a sectional view schematically showing an opening / closing mechanism.

FIG. 23 is a view for explaining the operation of a conventional gas blowing arc extinguishing apparatus having a nozzle guide, and shows a closed (closed) state.

FIG. 24 shows the same way in the middle of opening.

FIG. 25 also shows an open state.

FIG. 26 shows a conventional type nozzle guide.
(A) is a front view, (b) is a plan view, and (c) is a side view.

[Explanation of symbols]

 24 Fixed electrode 25 Movable electrode 25c Arcing part 27 Nozzle guide 27b Guide part 27c Passing part 27d Gas throttle part 27e Discharge part a Width of guide part b Width of arc extinguishing chamber

Claims (2)

[Claims] When the movable electrode is separated from the fixed electrode, the arc-extinguishing gas in the arc-extinguishing chamber is compressed by the nozzle guide with the opening of the movable electrode, and the compressed arc-extinguishing gas is generated between the two electrodes. A rotary puffer type gas blowing type arc extinguishing device which extinguishes an arc by blowing the same, wherein the nozzle guide is integrally fixed to a movable electrode. A guide portion which is formed in a flared shape toward the front for collecting the arc-extinguishing gas located in front of the movable electrode while compressing the same, and the flow rate of the arc-extinguishing gas collected by the guide portion is determined by the movable electrode. A gas throttle section with a narrow gas flow passage so as to increase near the arcing section, and a rearwardly expanding flaring shape for discharging the gas flow through this gas throttle section to the rear. And a discharge section A rotary puffer type gas blowing type arc extinguishing device characterized by the above-mentioned. 2. The rotary puffer type gas blowing type arc extinguishing apparatus according to claim 1, wherein the width of the guide portion of the nozzle guide is formed substantially equal to the width of the arc extinguishing chamber.