JPH0260013A - Buffer type gas circuit breaker - Google Patents

Abstract

PURPOSE:To shut off current in a short time by providing plural flow straightening fins for partitioning a gas discharge passage in circumferential direction with the fins held inclined to a movable arcing contact. CONSTITUTION:When a driving rod 8 is moved to the right to shut off current, a fixed piston 17 compresses an insulating gas in a buffer chamber 9, and the insulating gas is pushed out from plural discharging holes 20 into a discharge passage 12. The gas is then blown against an arc 19 generated between fixed arcing contacts 4 and 7. At that time, the insulating gas discharged from each of the discharging holes 20 into the discharge passage 12 does not interfere with the gas discharged from adjacent discharging hole 20 due to the presence of flow straightening fins 21. Thus, the insulating gas flows through the discharge passage 12 in a laminar flow condition without energy loss, and after flowing between the flow straightening fins, the gas generates eddy flows and is blown against the arc 19. The arc 19 is throttled to reduce its diameter and distinguished.

Description

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

B0 Summary of the Invention The present invention provides a buffer-type gas cutoff in which when a movable arcing contact is separated from a fixed arcing contact, an insulating gas in a buffer chamber is blown onto the arc from a plurality of discharge holes through a single discharge path to extinguish the arc. By arranging rectifier fins that are inclined with respect to the axis of the movable arcing contact at approximately equal intervals circumferentially within the discharge path, the arc can be blown from the buffer chamber through the discharge hole and the discharge path. The insulating gas that is applied is rectified by rectifying fins, and the interruption performance is improved by preventing energy loss in the insulating gas.

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

The structure of a conventional buffer type gas circuit breaker is shown in FIG. As shown in the figure, the buffer type gas circuit breaker is composed of a fixed unit 2 and a movable unit 2. The fixed unit I 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 thereof. an insulating nozzle 13 forming a discharge path 12 between the buffer cylinder 10 and the buffer chamber 9; A ring is attached to a fixed part (not shown) via a movable main contact 14 fixed to the outside of the main contact 13 and a hollow rod 16 having an exhaust hole 15, and is slidably provided between the drive rod 8 and the buffer cylinder lO. It is composed of a piston 17 having a shape. Note that 18 is a sealing material. Each unit is S
It is installed in an insulating gas such as Fe gas, and constitutes a buffer type gas circuit breaker.

In such a buffer type gas circuit breaker, the drive rod 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 driving speed of the driving rod 8 is generally 8 to 10 m/s.
It is.

D2 Problem to be Solved by the Invention However, as shown in FIG. 5, there is a discharge path from the buffer chamber 9 through the discharge hole 20! When the insulating gas is discharged to the discharge holes 20, the insulating gases discharged from the adjacent discharge holes 20 interfere with each other and generate eddies or turbulence. Therefore,
The insulating gas obtained by being compressed in the buffer chamber 9 loses more energy than in the case of laminar flow, resulting in a decrease in the interrupting performance.

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

E 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, which is hollow near the tip, to the fixed arcing contact. The tip of the drive rod is provided so as to be movable along the axis, and the fixed arcing contact can be freely fitted and removed, and the movable arcing contact is used as the movable arcing contact. A buffer chamber opening toward the anti-solid bore contact side is provided between the drive rod and the buffer cylinder by fitting a buffer unlinder having a diameter dimension, and an insulating nozzle is connected to the buffer cylinder so as to cover the movable arc contact. By doing so, a cylindrical discharge path is formed between the movable arcing contact and the insulating nozzle, and multiple discharge holes are provided around the drive loft to communicate the discharge path and the buffer chamber, and the buffer anoring and the drive rod are connected. In a buffer type gas circuit breaker, in which a piston that is slidable and movable within a buffer chamber is fixed to a fixed part, a rectifying fin that is inclined with respect to the axis of the movable arcing contact is installed in the discharge path along the circumferential direction. They are characterized in that they are arranged at approximately equal intervals.

Since there is a rectifying fin 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, the efficiency of the flow is improved, the flow rate increases, and after passing through the rectifying fins, the insulating gas becomes a vortex flow and is blown onto the arc. Therefore, the interrupting performance is improved.

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 Example As shown in FIGS. 1 and 2, a buffer chamber 9 and a discharge path 1 are shown.
The discharge hole 20 communicating with the buffer anoring lO
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 rectifying fins 21 are provided to partition the discharge path I2 in the circumferential direction. The rectifying fin 21 has one end adjacent to the discharge hole 20.
The other end extends toward the tip of the movable arcing contact 7. As shown in FIG. 2, the rectifying fins 21 are arranged on the outer circumferential surface of the substantially cylindrical shield 22 at regular intervals along the circumferential direction, and with respect to the axis of the movable arcing contact 7, that is, the axis of the shield 22. It is formed at an angle. The shield 22 is attached to the movable arcing contact 7 so as to cover its outer peripheral surface.

The shield 22 itself is provided to prevent the electric field from concentrating on the tip of the movable arcing contact 7.

In addition, as shown in FIG. 3, the rectifying fins 21 may be fixed to the inner peripheral surface of the insulating nozzle 13, and the insulating nozzle 13 may be attached to the buffer cylinder 10.

(b) When the working current of the embodiment is cut off, when the drive rod 8 is moved to the right in FIG. 1, the fixed piston I7 compresses the insulating gas in the buffer chamber 9, and as a result, is pushed 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 this time, since the insulating gas discharged from the discharge hole 20 toward the discharge path 12 has the rectifying fins 21, the insulating gas discharged from the adjacent discharge holes 20 will not interfere with each other as in the conventional case. do not have. Therefore, the insulating gas flows through the discharge path 12 in a laminar flow state with no energy loss, and after flowing between the rectifying fins 21, generates a vortex flow and is blown onto the arc 19. At this point, the arc becomes narrower and extinguished.

1-1 Detailed Description of the Invention According to the buffer type gas circuit breaker according to the present invention, a plurality of rectifying fins that partition the discharge path in the circumferential direction are provided at an angle with respect to the movable arcing contact. The insulating gas discharged from matching discharge holes does not interfere with each other as in the past, causing turbulence in the gas flow and energy loss, and the shutoff performance is improved, making short-time shutoff possible.

In other words, it is possible to reduce the stroke and drive speed of the drive rod by the amount of improved shutoff performance, and the mechanical strength and dimensions of the drive means can be reduced.

Furthermore, the arc can be surrounded by a cylindrical rotating body, and the arc can be cooled uniformly.

[Brief explanation of the drawing]

Figures 1 to 3 relate to an embodiment of a buffer type gas circuit breaker according to the present invention, in which Figure 1 is a cross-sectional view, Figure 2 is a perspective view of a shield provided with rectifying fins, and Figure 3 is a perspective view of a shield provided with rectifying fins. A perspective sectional view of the provided insulating nozzle, FIGS. 4 and 5 relate to a conventional buffer type gas circuit breaker, FIG. 4 is a sectional view, and FIG. 5 is a sectional view of a main part. 4...Fixed arcing contact, 5...Hollow part, 7
...Movable arcing contact, 8...Drive rod,
9...Buffer room, 10...Buffer anoring, 1
2...Discharge path, 13...Insulating nozzle, 16...Hollow rod, 17...Piston, 20...Discharge hole, 21...
Rectifier fin, 22...shield. Fig. 1 4 Fixed Archinog contact 5 Hollow part 7 Movable Archinog contact 8... Drive rod 9 Buffer chamber 10 Puffer nozzle 2 Discharge path +3 WA sewing nozzle 16 Hollow rod 17 - Bistono 20 Sheet hole 21 Rectifying fin 22 ・/ -Rudo

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. A buffer chamber opening toward the fixed arcing contact is provided, and an insulating nozzle is coupled to the buffer cylinder so as to cover the movable arcing contact, thereby forming a cylindrical discharge path between the movable arcing contact and the insulating nozzle, A buffer-type gas cutoff in which multiple discharge holes are provided around the drive rod to communicate the discharge path and 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. 1. A buffer type gas circuit breaker, characterized in that rectifying fins inclined with respect to the axis of the movable arcing contact are arranged in the discharge path at approximately equal intervals along the circumferential direction.