JP2570605Y2 - Gas switchgear - 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 switchgear such as a gas circuit breaker or a gas switchgear having a puffer chamber for easily and reliably mounting an insulating nozzle.

[0002]

2. Description of the Related Art A conventional gas switchgear of this type has the structure shown in FIG. In the figure, 1 is a fixed male contact, 2 is a fixed cylinder, 3 is a movable conductor provided movably with respect to the cylinder 2, 4 is a piston formed on a movable conductor 3 in the cylinder 2. Reference numeral 5 denotes an O-ring provided on the peripheral surface of the piston 4 and slidably in contact with the inner surface of the cylinder 2. Reference numeral 6 denotes a female contact which is mounted on the tip of the conductor 3 and comes into contact with and separates from the male contact 1. Nozzle support.

Reference numeral 8 denotes an insulating nozzle provided so as to cover the distal end of the female contact 6 which is in contact with the distal end surface of the nozzle support 7, 9 is a step formed at an intermediate portion of the outer peripheral surface of the nozzle 8, Reference numeral 10 denotes a presser foot for fixing the nozzle 8, reference numeral 11 denotes a key portion formed on the presser foot 10, and abuts against the step 9, reference numeral 12 denotes a screw formed on the outer peripheral surface of the tip end of the nozzle support 7, and reference numeral 13 denotes a presser foot 10 A screw formed on the inner peripheral surface of the base portion and screwed to the screw 12. Both screws 12, 13 are machined with a large-diameter fine screw, and after the screw is tightened, a punch lock is applied to prevent loosening such as opening and closing vibration. Have been. 14 is the cylinder 2
Inside the puffer room.

When the conductor 3 moves to the right from the input state, the female contact 6 and the piston 4 move to the right, and the arc-extinguishing gas in the puffer chamber 13 is compressed to increase the pressure, thereby increasing the female shape. The contact 6 is separated from the male contact 1 and an arc is generated between the contacts 6 and 1.
The gas in the puffer chamber 14 is guided by the nozzle 8 and blows against the arc, and the arc disappears.

Further, in the microfilm disclosed in Japanese Utility Model Application No. 59-168092, a gap is formed in the axial direction and the diametric direction between the flange portion of the insulating nozzle and the step portion of the mounting ring. A nozzle mounting device is described in which a resin ring having elasticity in the diametric direction is inserted and the mounting ring is fixed to a cylinder by a screw.

[0006]

In the case of the conventional apparatus shown in FIG. 5, the screw 12 of the nozzle support 7 and the presser foot 1 are provided.
0 screw 13 needs to be machined with a large-diameter fine screw, which is difficult to machine, and the punch lock operation is more and more difficult for the operator, and the mounting reliability of the insulating nozzle 8 is weak. There is a point.

In the case of the apparatus described in the microfilm, the resin ring must have elasticity in the axial direction and the diametric direction, that is, a repulsive force, and when the repulsive force of the resin ring decreases over time, There is a problem that the axial force of the screw fixing the mounting ring is reduced, loosened by opening and closing vibration, and the nozzle comes off.

Further, the groove in which the resin ring fits is only on the mounting ring side, and requires members such as a resin ring having elasticity, a mounting ring, and screws, so that the member cost is high and the number of parts is large. The number of assembling steps increases, and the cost increases.

The present invention has been made in view of the above points, and has as its object to provide an inexpensive gas switching device in which an insulating nozzle is easily and securely mounted.

[0010]

In order to solve the above-mentioned problems, the present invention blows a compressed gas in a puffer chamber to an arc generated when the male and female contacts are separated by using an insulating nozzle as a guide. In a gas switching device for extinguishing an arc, a contact surface abutting on a tip end surface of a nozzle support is formed at an intermediate portion of an inner surface of a nozzle, and an inner surface of a nozzle base and an outer surface of a tip end of a nozzle support are formed. Are formed in the respective contact surfaces with each other, an O-ring is fitted over both grooves, and the nozzle is mounted on the nozzle support.

[0011]

In the gas switchgear of the present invention configured as described above, the contact surface of the intermediate portion of the inner surface of the insulating nozzle is in contact with the tip surface of the nozzle support. Even if the inner projection of the nozzle contacts the male contact, it is absorbed by the contact surface, and an annular groove is formed on the mutual contact surface between the inner surface of the nozzle base and the outer surface of the tip of the nozzle support. Since the O-ring is fitted over both grooves, the nozzle does not deviate due to the slight sliding friction generated between the nozzle and the male contact at the time of separation, and the nozzle is easily mounted. It is sure.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described with reference to FIGS. In these figures, the same reference numerals as those in FIG. 5 indicate the same or corresponding elements, and the differences from FIG. 5 are as follows. (Example 1) In FIGS. 1 and 2 showing Example 1, reference numeral 15 denotes a contact surface formed at an intermediate portion of the inner surface of the insulating nozzle 8, which is in contact with the tip end surface 16 of the nozzle support 7. . Reference numeral 17 denotes an annular groove formed on the inner surface of the base of the nozzle 8, reference numeral 18 denotes an annular groove formed on the outer surface of the tip of the nozzle support 7, and reference numeral 19 denotes an O-ring fitted over both the grooves 17, 18. , 20 are tapers formed on the inner surface of the base end of the nozzle 8, and FIG.
As shown in FIG. 7, the mounting of the nozzle 8 on the nozzle support 7 is facilitated.

If there is a center runout or the like between the male contact 1 and the insulating nozzle 8, the projection inside the nozzle 8 collides with the male contact 1 at the time of injection.
The impact in the moving direction of the nozzle support 7 is applied to the contact surface 1 of the nozzle 8.
The nozzle 8 does not deviate from the nozzle support 7 because it is absorbed by the contact between the nozzle support 5 and the tip end surface 16 of the nozzle support 7. Further, when the nozzle 8 is separated, the sliding friction force between the nozzle 8 and the male contact 1 is weak, and in this case, the nozzle 8 does not deviate. Further, the nozzle support 7 may be an insulator made of synthetic resin in addition to metal.

(Embodiment 2) FIG. 3 showing Embodiment 2 is different from Embodiment 1 in that the conductor 3, the female contact 6, the nozzle support 7, and the nozzle 8 are fixed. The cylinder 2 is integrally movable.

(Embodiment 3) In FIG. 4 showing Embodiment 3, male contacts 1 and
The conductor 3 and the cylinder 2 are fixed, an O-ring 5 is provided on the outer periphery of the tip of the cylinder 2, and the nozzle support 7 has a cylinder function or a piston function.
The inner surface of the outer cylinder 21 on the base side slides on the O-ring 5, the inner surface of the inner cylinder 22 on the base side of the nozzle support 7 slides on the conductor 3, and one end of the female contact 6 mounted on the inner cylinder 22. Are always in sliding contact with the conductor 3, and the other end of the female contact 6 comes into contact with and separates from the male contact 1 due to the movement of the nozzle support 7.

[0016]

[Effects of the Invention] Since the present invention is configured as described above, the following effects can be obtained. Since the contact surface 15 in the middle of the inner surface of the insulating nozzle 8 is in contact with the tip end surface 16 of the nozzle support 7, even when the projection of the nozzle 8 contacts the male contact 1 due to center runout or the like at the time of injection. Annular grooves 17 and 18 are formed on the contact surface between the inner surface of the base of the nozzle 8 and the outer surface of the tip of the nozzle support 7, and are absorbed by the contact surface 15.
Since the O-ring 19 is fitted over the members 7 and 18, the nozzle 8 does not deviate due to the weak sliding friction generated between the nozzle 8 and the male contact 1 at the time of opening, and the structure is simple. And the processing is easy, there is no punch lock work, there is no individual difference in the mounting of the nozzle 8, the nozzle 8 can be securely mounted, and the nozzle 8 is mounted on the nozzle support 7 only by the O-ring 19. Therefore, the material cost is low, the number of parts is small,
Become cheap.

[Brief description of the drawings]

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

FIG. 2 is an exploded view of a part of FIG.

FIG. 3 is a cut front view of the second embodiment.

FIG. 4 is a cut front view of a third embodiment.

FIG. 5 is a cut-away front view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Male contact 3 Conductor 6 Female contact 7 Nozzle support 8 Insulating nozzle 14 Puffer chamber 15 Contact surface 16 Tip surface 17 Groove 18 Groove 19 O-ring

Claims (1)

(57) [Scope of request for utility model registration] 1. A gas opening / closing device in which a compressed gas in a puffer chamber is blown to an arc generated when the male and female contacts are separated by using an insulating nozzle as a guide, thereby extinguishing the arc. the nozzle supporting structure in the middle portion of the inner surface tip surface to form a contact with the contact surface, the inner surface of the base portion of the nozzle and the nozzle support of the distal end portion each annular in mutual contact surfaces between the outer surface of the A gas opening / closing apparatus in which a groove is formed, an O-ring is fitted over both grooves, and the nozzle is mounted on the nozzle support.