JPH069426Y2 - Gas circuit breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an improvement of a gas circuit breaker, particularly a contact portion.

[Prior Art] FIG. 3 shows a vertical cross section of a movable side contact portion of a known puffer type gas circuit breaker, in which 1 is a hollow arc contactor and 2 is a hollow arc contactor.
A sleeve 3 for covering the outer circumference of the arc contactor 1 is a main contactor, and the main contactor 3 is formed integrally with the operation rod 4 and the puffer cylinder 5. An insulating nozzle 6 is provided inside the main contactor 3 and the arc contactor 1 and the sleeve 2 are provided.
And the gas flow path 7 are formed between them.

Thus, the above-mentioned sleeve 2 is provided so that the gas flow does not flow out from the notch 8 provided in the arc contactor 1 at the initial stage of interruption, and in general, a heat-resistant insulating material such as Teflon containing alumina is used. It is used, and as shown in FIG. 4, a protrusion 21 is provided at the lower end toward the inside. Therefore, when the sleeve 2 is mounted on the arc contactor 1, the sleeve 2 is engaged with the step portion 11 provided on the outer circumference of the arc contactor 1 with the above-mentioned projection 21, and the sleeve retainer 9 and the disc spring 10 are attached. The threaded portion 15 at the lower end portion of the arc contactor 1 is screwed into the threaded portion 16 of the operation rod 4 via the intermediary of the arc contactor 1 to be held and fixed.

In addition, 12 is a puffer piston, 13 is a gas discharge passage,
14 is a puffer room.

[Problems to be solved by the device]

In the contact portion configured as described above, in order to mount and fix the sleeve 2 on the arc contactor 1, a projection 21 is provided on the lower end of the sleeve 2, and the projection 21 is provided on the outer circumference of the arc contactor 1. The sleeve 2 is mounted in a predetermined position by engaging with the portion 11.

Therefore, the sleeve 2 is inserted from the lower end portion of the arc contactor 1. However, since the sleeve 2 is fixed at a predetermined position of the arc contactor, the step portion 11 that engages with the protrusion 21 is attached to the arc contactor 1. Must be provided on the outer circumference of.

Therefore, the outer diameter of the lower end portion of the arc contactor 1 must be formed to be equal to or slightly smaller than the inner diameter of the protrusion 21, and for this reason, the hollow portion of the arc contactor 1, that is, the gas discharge path 13 To secure the wall thickness of the arc contactor 1
Structurally, it is inevitably reduced by one step, and a narrow portion d is generated.

As a result, there is a problem that the discharge efficiency of the hot gas is reduced, and the disc spring 10 is used to prevent the arc contactor 1 from loosening, but the sleeve 2 is made of an insulating material such as Teflon as described above. Therefore, there is a problem that the sleeve retainer 9 is required between the disc spring 10 and the sleeve 2, and the structure is complicated.

[Means for Solving the Problems]

According to the present invention, an inward projection is provided on the lower end of the sleeve over the entire circumference thereof, and a plurality of interruptions are formed in the axial direction of the sleeve on the circumference of the end having the projection, and the outer circumference of the arc contactor is formed. An engaging groove into which the protrusion is inserted is provided.

[Action]

Since a plurality of interrupts are formed from the end in the axial direction of the sleeve and the interrupts are made to have elasticity,
The protrusion provided at the end of the sleeve allows passage of a portion larger than the inner diameter of the sleeve. Therefore, the sleeve can be attached to the arc contactor from the tip of the arc contactor, and The protrusion is autonomously immersed and fixed in the engaging groove provided on the outer circumference of the arc contactor by the elasticity of the interruption portion. Therefore, it is not necessary to form a narrow portion in the arc contactor due to the protrusion of the sleeve, and a member for fixing the sleeve such as the sleeve retainer can be omitted without causing the narrow portion in the gas discharge path. You can also

〔Example〕

FIG. 1 shows a vertical cross section of a movable side contact portion which is an embodiment of the present invention, and FIG. 2 shows a perspective view of a sleeve used in the embodiment of FIG. Since the items with "" are the same as those in FIG. 3, detailed description thereof will be omitted.

In the embodiment shown in FIG. 1, the sleeve 2'mounted on the outer periphery of the arc contact 1'is interrupted by a projection 21 'provided at one end thereof, as shown in the perspective view of FIG.
Are arranged in four places on the entire circumference of the sleeve 2 in four places.

On the other hand, the arc contactor 1'is provided with an engaging groove 18 around the entire circumference of the arc contactor 1'at a position facing the projection 21 'at a position where the sleeve 2 substantially covers the arc contactor. .

Therefore, in this embodiment, when the sleeve 2'is attached to the arc contactor 1 ', the elasticity of the interruption portion 23 of the sleeve 2'is used to expand the circumference by the amount corresponding to the projection 21', and the arc contactor When the projection 21 'reaches the position of the engaging groove 18 provided on the outer circumference of the arc contactor 1'by inserting and pushing in the sleeve 2'from the tip of the sleeve 2'
Due to the elasticity of the interruption portion 23, the projection 21 'autonomously sinks into the engagement groove 15, and the sleeve 2'is fixed at this position.

For this reason, the arc contactor 1 ′ does not need to form a step portion on the outer periphery of the lower end portion as in the conventional example. Therefore, it is not necessary to project the step portion toward the gas discharge passage 13 and sufficient wall pressure of the portion can be secured. As a result, there is no narrow area in the gas discharge path.

In this case, the arc contactor 1'is fitted with the sleeve 2'and the mounting screw portion 19 at the lower end is attached to the disc spring 10 '.
It is screwed into the threaded portion 20 provided on the operation rod 4 ′ through and is fixed.

〔effect〕

According to the present invention, an interrupt is formed in the sleeve, and the sleeve itself has elasticity, and by utilizing this elasticity, the projection of the sleeve is autonomously immersed in the engaging groove provided in the arc contactor. Therefore, it is not necessary to provide the arc contactor with a stepped portion with which the protrusion of the sleeve engages, and therefore, it is not necessary to provide the arc contactor with a small diameter portion, and the protrusion toward the gas discharge passage is ensured in order to secure the wall thickness. Is unnecessary. Therefore, it is possible to secure a sufficient gas discharge path in a limited space without forming a narrow portion in the gas discharge path.

Further, as described above, the sleeve is autonomously fixed to the arc contactor by utilizing its own elasticity, so that the sleeve retainer can be omitted and the structure can be simplified accordingly. is there.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a movable contact portion showing an embodiment of the present invention, FIG. 2 is a perspective view of a sleeve used in the embodiment of the present invention shown in FIG. 1, and FIG. 3 is a movable gas circuit breaker. FIG. 4 is a longitudinal sectional view showing a conventional example of the side contact portion, and FIG. 4 is a perspective view of a sleeve used in the movable side contact portion shown in FIG. 1, 1 ': arc contact, 2, 2': sleeve, 3: main contact, 6: insulating nozzle, 7: gas passage, 18: engaging groove, 21, 21 ': protrusion, 22 ... Interruption .

Claims (1)

[Scope of utility model registration request] 1. A hollow arc contactor, a sleeve mounted on the arc contactor, the arc contactor and the sleeve surrounding the hollow arc contactor, and arranged so as to form a gas flow path therebetween. And a plurality of interrupts are formed in the axial direction of the sleeve on the circumference of the end having the protrusion, the protrusion being provided inward at the lower end of the sleeve. A gas circuit breaker having a contact portion provided with an engaging groove into which the projection is recessed, on the outer periphery of the arc contactor.