JP2592329Y2 - Gas switchgear - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a gas circuit breaker in which compressed gas in a puffer chamber is blown against an arc generated when a fixed contact and a movable contact are separated, thereby extinguishing the arc. ,
The present invention relates to a gas switch such as a gas switch.

[0002]

2. Description of the Related Art A conventional gas switchgear of this type has the structure shown in FIGS. In those figures, 1
Is a cylinder constituting the puffer chamber 2, 3 is a lid covering the bottom of the cylinder 1, 4 and 5 are vent holes formed through the bottom side and the tip side of the cylinder 1, and 6 is a lid 3 having a base of 3. Is a cylindrical fixed contact having an opening 7 formed at the end thereof, and 8 is a gas vent hole formed on the base side of the fixed contact 6.

[0003] Reference numeral 9 denotes a cylindrical moving body which penetrates the tip of the cylinder 1 and is movably provided. 10 is a stopper which is fixed to the tip of the moving body 9 and which closes the opening 7 so that it can be opened and closed. The movable contact is fixed to the end of the fixed contact 6 and is formed by arranging a plurality of strip-shaped contact pieces in a cylindrical shape, and the end is in sliding contact with the peripheral surface of the fixed contact 6. Reference numeral 12 denotes a ring spring provided on the outer periphery of the distal end of the movable contact 11.

[0004] Reference numeral 13 denotes a piston whose base is fixed to the base of the movable contact 11 and covers the movable contact 11, 14 denotes a gas vent hole provided through the base of the piston 13, and 15 denotes a piston fixed to the tip of the piston 13. A nozzle slidably contacting the peripheral surface of the fixed contact 6, a nozzle fitting 16 screwed to a piston 13 pressing the nozzle 15, a pin 17 integrating the piston 13, the movable contact 11, and the stopper 10; This is a base body in which the base of the moving body 9 is closed.

When the moving body 9 moves to the left in the shut-off direction from the closed state in FIG. 3, the arc-extinguishing gas in the puffer chamber 2 is compressed to increase the pressure, and the two contacts 6, 11 are separated. The generated arc is blown with gas to extinguish the arc.

At this time, in the case of a small current, before the nozzle 15 separates from the fixed contact 6, the gas vent hole 14 of the piston 13, the gap between each contact of the movable contact 11, the opening 7 of the fixed contact 6. The arc is drawn into the fixed contact 6 from the opening 7 by the gas flow flowing through the gas vent hole 8 to extinguish the arc. In the case of a large current, the arc is extinguished by the gas flow between the tip of the fixed contact 6 and the nozzle 15 in a state where the nozzle 15 is separated from the fixed contact 6.

[0007]

In the case of the above-mentioned conventional apparatus, when the moving body 9 starts to move in the blocking direction from the closed state in FIG. 3, the stopper 10 separates from the opening 7 of the fixed contact 6, and
As indicated by the arrow, the gas in the puffer chamber 2
3, through the gap between the contact pieces of the movable contact 11, the opening 7 of the fixed contact 6, and the gas vent hole 8, the rise of the gas pressure in the puffer chamber 2 is reduced, and sufficient gas There is a problem that the pressure cannot be obtained, the arc cannot be reliably shut off at the time of a large current, and the shut-off performance deteriorates. An object of the present invention is to provide a gas switchgear in which the above-described points are taken into consideration and the shutoff performance is improved.

[0008]

In order to solve the above-mentioned problems, a gas opening / closing device according to the present invention has a cylindrical fixed structure in which a base is fixed to the bottom of a cylinder constituting a puffer chamber and a gas vent hole is formed. A contact, a movable contact having a plurality of strip-shaped contact pieces movably provided in the puffer chamber and arranged in a cylindrical shape, and having a leading end slidably contacting the peripheral surface of the fixed contact; The base is fixed to the movable contact and covers the movable contact,
A piston having a vent hole, a nozzle fixed to the tip of the piston and slidably in contact with the peripheral surface of the fixed contact, and a stopper movably supported by the movable contact and in contact with the opening at the tip of the fixed contact And a spring for urging the plug toward the fixed contact, a long hole formed in the plug, and a pin implanted in the movable contact and inserted through the long hole.

[0009]

In the gas switchgear of the present invention having the above-mentioned structure, the stopper in contact with the opening at the tip of the fixed contact is movably supported by the movable contact, and is biased by the spring toward the fixed contact. Since the pin implanted in the movable contact is inserted through the elongated hole formed in the stopper, even if the movable contact starts to move in the blocking direction from the closed state, the stopper opens the fixed contact by the spring. Is maintained, the gas does not flow through the gas vent hole of the fixed contact, the gas pressure in the puffer chamber increases, and the effect of blowing gas to the arc at the time of a large current is improved.

[0010] Further, the relationship between the oblong hole of the plug and the pin is such that the plug is separated from the opening of the fixed contact just before the two contacts are separated and an arc is generated. The arc at the time of a small current is drawn into the fixed contact to extinguish the arc, and the breaking performance is improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment will be described with reference to FIGS. In these figures, the same reference numerals as those in FIGS. 3 and 4 indicate the same or corresponding elements, and the differences are as follows. The stopper 10 is movable with respect to the movable contact 11,
That is, the stopper 10 is movably provided at the tip of the moving body 9, and the fixed contact 6 side is urged by the spring 19 between the base 18 and the stopper 10 in the moving body 9, and the oblong hole 20 is formed in the stopper 10. The pin 1 which is penetrated and implanted in the movable contact 11 in the elongated hole 20
7 is inserted, and the stopper 10 is separated from the opening 7 immediately before the two contacts 6 and 11 are separated and an arc is generated.

Therefore, the movable contact 11
When the plug 10 starts moving in the blocking direction, the state in which the plug 10 contacts the opening 7 of the fixed contact 6 by the spring 19 is maintained until the pin 17 contacts the left end of the long hole 20, and the gas of the fixed contact 6 is maintained. Gas does not flow through the vent hole 8, the gas pressure in the puffer chamber 2 increases, and the effect of blowing gas to the arc at a large current is improved.

Further, the relationship between the long hole 20 of the plug 10 and the pin 17 is set so that the plug 10 is separated from the opening 7 of the fixed contact 6 immediately before the contacts 6 and 11 are opened and an arc is generated. As a result, the gas flows from the opening 7 of the fixed contact 6 to the gas vent hole 8, and the arc at the time of a small current is drawn into the fixed contact 6 to extinguish the arc, thereby improving the breaking performance.

[0014]

[Effects of the Invention] Since the present invention is configured as described above, the following effects can be obtained. In the gas switchgear of the present invention, the stopper 10 which is in contact with the opening 7 at the tip of the fixed contact 6 is automatically supported by the movable contact 11 and the spring 1
9, the pin 17 implanted in the movable contact 11 is inserted through the elongated hole 20 formed in the stopper, so that the movable contact 11 is moved in the blocking direction from the closed state. Even if it begins to move, the stopper 10 causes the fixed contact 6
Is kept in contact with the opening 7, the gas does not flow through the gas vent hole 8 of the fixed contact 6, the gas pressure in the puffer chamber 2 rises, and the gas is blown to the arc at a large current. The effect can be improved. Further, the relationship between the long hole 20 of the plug 10 and the pin 17 is determined by the fact that the plug 10 is opened by the opening of the fixed contact 6 immediately before the contacts 6 and 11 are separated and an arc is generated. By moving away from the fixed contact 7, gas flows from the opening 7 of the fixed contact 6 to the gas vent hole 8, and the arc at the time of a small current is drawn into the fixed contact 6 to extinguish the arc, thereby improving the breaking performance. can do.
In addition, the contact portion on the peripheral surface of the fixed contact 6 can be prevented from being roughened by arcing.

[Brief description of the drawings]

FIG. 1 is a cutaway front view of one embodiment of the present invention.

FIG. 2 is a cutaway front view of another state of FIG. 1;

FIG. 3 is a cutaway front view of a conventional example.

FIG. 4 is a cutaway front view of another state of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder 2 Puffer chamber 6 Fixed contact 7 Opening 8 Gas release hole 10 Plug 11 Movable contact 13 Piston 14 Gas release hole 15 Nozzle 17 Pin 19 Spring 20 Long hole

Claims (1)

(57) [Scope of request for utility model registration] 1. A cylindrical fixed contact having a base fixed to a bottom of a cylinder constituting a puffer chamber and having a gas vent hole, and a plurality of strip-shaped contacts movably provided in the puffer chamber. A movable contact having a contact piece formed in a cylindrical shape and having a leading end slidably contacting the peripheral surface of the fixed contact;
A piston having a base fixed to the movable contact and covering the movable contact and having a vent hole formed therein; a nozzle fixed to a tip of the piston and slidably contacting a peripheral surface of the fixed contact; A stopper that is movably supported by the connector and abuts on an opening at the tip of the fixed contact, a spring that urges the stopper toward the fixed contact, an elongated hole formed in the stopper, and the movable contact. A gas switching device comprising: a pin that is implanted in a child and inserted into the elongated hole.