JPH0227630A - Buffer type gas circuit breaker - Google Patents

Abstract

PURPOSE:To improve breaking performance by providing a plurality of partition walls one end of which is fixed between discharge holes adjacent to each other in a buffer cylinder and the other end extended toward the forward end of a movable arcing contact to separate a discharge passage. CONSTITUTION:A plurality of partition walls 21 of which one end is fixed between discharge holes 20 adjacent to each other in a buffer cylinder and the other extended toward the forward end of a movable arcing contact 7 to separate a discharge passage 12 are provided around the movable arcing contact 7. By thus providing the partition walls 21 in the discharge passage 12, insulating gas is discharged from a buffer chamber 9 through the discharge holes 20 to the discharge passage 12 without mutual interference between insulating gas desiccated from the discharge holes 20 adjacent to each other. Flows of insulating gas, therefore, become like layers of currents or similar currents, and flow quantity is increased because flow efficiency is improved. Breaking performance can thus be improved.

Description

[Detailed description of the invention] A. Industrial application field The present invention relates to the structure of a buff γ type gas circuit breaker.

B1 Summary of the Invention The present invention provides a buff γ-type gas that extinguishes the arc by blowing insulating gas in the buffer chamber from a plurality of discharge holes onto the arc through a single discharge path when the movable arcing contact is separated from the fixed arcing contact. In a circuit breaker, by providing a partition wall that separates the discharge path between the discharge holes, the partition wall rectifies the insulating gas that is blown onto the arc from the buffer chamber through the discharge hole and the discharge path, thereby reducing the amount of insulating gas. This improves interrupting performance by preventing energy loss.

C1 Conventional technology A buff γ type gas circuit breaker is used as a power circuit breaker.

The structure of a conventional buff γ type gas circuit breaker is shown in FIG. As shown in the figure, the buff γ type gas circuit breaker is composed of a fixed unit 1 and a movable unit 2. The "fixed unit" is composed of a hollow fixed main contact 3 and a fixed arcing contact 4 provided at the center inside the main contact.

On the other hand, the movable unit 2 has a hollow part 5 and a communication hole 6, and a drive rod 8 whose tip part becomes a movable arcing contact 7 and is driven in the left-right direction in the figure, and a drive rod 8 that is fitted on the outside of the drive rod 8 and driven. A buffer cylinder 10 that forms a buffer chamber 9 between the rod 8 and the drive rod 8 is fixed to the buffer cylinder 10 so as to cover the movable arcing contact 7 and has an insertion hole 11 at the tip. an insulating nozzle 13 that forms a discharge path 12 at the side; a discharge hole 20 formed in multiple stages in the circumferential direction of the buffer cylinder IO to communicate the discharge path 12 with the buffer chamber 9; A ring-shaped piston is attached to a fixed part (not shown) via a hollow rod 16 having an exhaust hole 15 and is slidably provided between the drive rod 8 and the buffer cylinder lO. It consists of 17. Note that 18 is a sealing material. Each unit is
It is installed in an insulating gas such as SF gas and constitutes a buff γ type gas circuit breaker.

In such a buff γ type gas circuit breaker, the driving robed 8
When the drive rod 8 is driven to the left in the figure and is inserted, insulating gas is sucked into the buffer chamber 9 from the insertion hole 11, and when the drive rod 8 is driven to the right in the figure to shut off, the buffer chamber 9
The insulating gas inside is discharged from the discharge path 12 through the discharge hole 20 as shown in FIG. The insulating gas is blown onto the arc 19 generated between the fixed arcing contact 4 and the movable arcing contact 7 to extinguish it, and then
It is discharged through the insertion hole 11 or the communication hole 6 and the exhaust hole 15. The drive speed of the drive rod 8 is generally 8~lom/s
It is.

D1 Problem to be Solved by the Invention However, as shown in FIG. Insulating gases interfere with each other, creating eddies and turbulence. Therefore, the insulating gas obtained by being compressed within the buffer chamber 9 loses more energy than in the case of laminar flow, resulting in a decrease in the blocking performance.

Therefore, an object of the present invention is to provide a buffer type gas circuit breaker that solves the above problems.

81 Means for Solving the Problems The structure of the present invention to achieve the above object is to fix a fixed arcing contact in an insulating gas, and at the same time to attach a drive rod formed hollow near the tip to the fixed arcing contact. A movable arcing contact is provided at the tip of a drive rod that is movable along the axis, and a fixed arcing contact can be freely inserted and removed, and an outer diameter larger than the outer diameter of the drive rod is provided on the outside near the tip of the drive rod. By fitting a buffer cylinder having a buffer cylinder with a buffer cylinder, providing a buffer chamber between the drive rod and the buffer cylinder that opens toward the side opposite to the fixed arcing contact, and coupling the insulating nozzle to the buffer cylinder so as to cover the movable arcing contact, A discharge path is formed between the movable arcing contact and the insulating nozzle, and a plurality of discharge holes are provided around the drive rod to communicate the discharge path and the buffer chamber, and the buffer is slidable between the buffer cylinder and the drive rod. In a buffer-type gas circuit breaker in which a piston that can move freely within a chamber is fixed to a fixed part via a robed member, one end is fixed between the discharge holes in the buffer cylinder, and the other end extends toward the tip of the movable arcing contact. A feature is that a plurality of partition walls are provided around the movable arcing contact to partition the discharge path.

Since there is a partition wall in the F1 action discharge path, the insulating gas discharged from the buffer chamber to the discharge path via the discharge hole does not cause mutual interference between the insulating gases discharged from adjacent discharge holes.

Therefore, the flow of the insulating gas becomes a laminar flow or a laminar flow, which improves the flow efficiency, increases the flow rate, and improves the blocking performance.

G. Examples Hereinafter, the present invention will be explained in detail based on examples shown in the drawings. It should be noted that this embodiment is a partial improvement of a conventional buffer type gas circuit breaker, so the same parts are given the same reference numerals and explanations are omitted, and only the different parts will be explained.

(a) Structure of the embodiment As shown in FIGS. 1 to 3, the buffer chamber 9 and the discharge path 1
2, the discharge hole 20 communicates with the buffer ring 10.
A plurality of rods are provided surrounding the drive rod 8.

The discharge path 12 is formed in a substantially cylindrical shape between the movable arcing contact 7 and the insulating nozzle 13, and a plurality of partition walls 21 are provided to partition the discharge path 12 in the circumferential direction. The partition wall 21 has one end formed integrally with the buffer cylinder 10 between adjacent discharge holes 20, and the other end extending toward the tip of the movable arcing contact 7. The arrangement and cross-sectional shape of the partition wall 21 are as shown in FIGS. 2 and 3.

In addition, as shown in FIG. 4, the number of discharge holes 20 can be reduced by making them long holes, or as shown in FIGS. 5(a) and 5(b), the movable arcing contact 7 can be
It is possible to make the flow of the insulating gas smoother by gradually decreasing the width of the cross section toward the side.

(b) When the working current of the embodiment is cut off, when the drive rod 8 is moved to the right in FIG. is forced out from the plurality of discharge holes 20 into the discharge path 12. This insulating gas is blown onto the arc 19 generated between the fixed arcing contact 4 and the movable arcing contact 7.

At that time, the insulating gas discharged from the discharge hole 20 toward the discharge path 12 is transferred to the partition wall 2! Therefore, as shown in FIG. 3, there is no interference between the discharged materials from adjacent discharge holes 20 as in the conventional case. Therefore, the insulating gas flows through the discharge path 12 in a laminar flow state with no energy loss,
Sprayed by Arc 19.

Since the partition wall 21 is located sufficiently on the side opposite to the fixed arcing contact 4 from the tip of the movable arcing contact 7, the electric field is not concentrated at the tip of the partition wall 21.

According to the buffer type gas circuit breaker according to the present invention, as described in detail of H1 invention, a partition wall is provided between adjacent discharge holes, and one end of the partition wall is fixed to the buffer cylinder, so that adjacent discharge holes The insulating gas emitted from the insulating gas does not interfere with each other as in the past, causing gas flow turbulence and energy loss, and the interruption performance is improved.

In other words, the drive speed of the drive rod can be reduced by the amount that the blocking performance is improved, and the mechanical strength and dimensions of the drive means can be reduced.

[Brief explanation of the drawing]

1 to 3 relate to an embodiment of the buffer type gas circuit breaker according to the present invention, FIG. 1 is a sectional view, and FIG.
1 is a view from the arrow 1, FIG. 3 is a view from the ■■ arrow in FIG. 2, FIG. 4 is an explanatory view showing another embodiment of the discharge hole, and FIG. , FIG. 6, and FIG. 7 relate to a conventional buffer type gas circuit breaker. FIG. 6 is a sectional view, and FIG. 7 is a sectional view of a main part. 4... Fixed arcing contact, 5... Hollow part,
7... Movable arcing contact, 8... Drive rod, 9... Buffer chamber, 10... Buff unring,
12...Discharge path, I3...Insulating nozzle, ■6...
Hollow rod, 17... piston, 20... discharge hole,
21... Partition wall. Cross-sectional view of a buffer type gas circuit breaker (this invention) 4... Fixed arcing contact 5 - Hollow part 7... Movable arcing contact 8... Drive rod 9 - Buffer chamber 10... Pub fan 12... Discharge path 13・Insulating nozzle 16 ・Hollow rod 17 ・Piston 20 ・Discharge hole 21 ・Partition wall Fig. 4 An explanatory diagram showing another embodiment of the discharge hole Fig. 5 A sectional view showing an embodiment of the pond in the partition wall (- ) (b) Fig. 2 A sectional view taken along the l-r arrow in Fig. 1 (this invention) Fig. 3 A sectional view taken along the ■-■ arrow in Fig. 2 (this invention) Fig. 6 A sectional view of a buffer type gas circuit breaker (Conventional) r-11 No-1 Cross-sectional view of the main part near the discharge hole (Conventional) <[

Claims (1)

[Claims] (1) While the fixed arcing contact is fixed in an insulating gas, a drive rod with a hollow tip is provided so that it can be driven along the axis of the fixed arcing contact, and the fixed arcing contact can be freely inserted and removed. The tip of the rod is a movable arcing contact, and a buffer cylinder having an outer diameter larger than the outer diameter of the drive rod is fitted on the outside near the tip of the drive rod, so that there is no reaction between the drive rod and the buffer cylinder. By providing a buffer chamber that opens toward the fixed arcing contact and coupling an insulating nozzle to the buffer cylinder so as to cover the movable arcing contact, a discharge path is formed between the movable arcing contact and the insulating nozzle, and the discharge path and A buffer-type gas in which multiple discharge holes are provided around the drive rod to communicate with the buffer chamber, and a piston that is slidable between the buffer cylinder and the drive rod and is movable within the buffer chamber is fixed to a fixed part via the rod. In a circuit breaker, a plurality of partition walls are provided around the movable arcing contact, one end of which is fixed between the discharge holes in the buffer cylinder, and the other end of which extends toward the tip of the movable arcing contact to partition the discharge path. Characteristic buffer type gas circuit breaker.