JPS63126127A - Gas breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Object of the Invention] (Industrial Application Field) The present invention relates to a buffer type gas circuit breaker that extinguishes an arc by spraying an insulating gas onto it, and particularly relates to a buffer type gas circuit breaker that extinguishes an arc by spraying an insulating gas onto the arc. This relates to a gas circuit breaker in which the arrangement of the puffer piston and the structure of the energizing contact in the movable contact portion have been improved.

(Prior art) In recent years, the shape of gas circuit breakers has become smaller and the number of disconnection points has become smaller, but in large cities, substations are increasingly being installed underground, so gas circuit breakers are becoming more and more compact. There is a strong demand for improved reliability, and there is also a demand for smaller circuit breakers.

FIG. 3 is a sectional view showing an example of a conventional buffer type gas circuit breaker for arc extinguishing. A main interrupting section is housed within the inter-electrode insulating cylinder 1, and this main interrupting section is composed of a fixed side contact section 2 and a movable side contact section 3. A fixed electrode 4 is provided at the center of the fixed contact portion 2, and the base end of the fixed electrode 4 is connected to an external device via a terminal 5. On the other hand, the movable contact portion 3 includes a puffer cylinder 9 connected to a drive mechanism (not shown) via an insulating rod 6 and an operation rod 8 having an exhaust lower, and a puffer piston 10 fixed inside the puffer cylinder 9. , These cylinder 9 and piston 10 form a buffer 11.

A movable electrode 12 that contacts the fixed electrode 4 and an insulating nozzle 13 that surrounds the movable electrode 12 are provided at the center of the tip of the pants cylinder 9 . A finger-shaped current-carrying contact 14 is disposed on the outer periphery of the puffer cylinder 9 to establish electrical contact between the puffer cylinder 9 and the conductor connection portion 15 . One end of this conductor connection part 15 is fastened with a bolt 17 to a mounting part 16 provided on the outer periphery of the interpole insulating cylinder 1 that houses the main interrupting part, and the other end is mechanically connected to the conductor connection part 15. It is connected to the support insulating cylinder 18 that supports it.

Further, at both ends of the puffer piston 10, there are operating rods 8 that coaxially connect the movable electrode 12 and the insulating rod 6.
A bearing portion 19 is attached.

The inter-electrode insulating tube 1, the conductor connection portion 15, the support insulating tube 18, etc. are electrically insulated in a metal grounding tank sealed with an insulating gas such as SFa gas (not shown), and mechanically Retained.

When a disconnection command is given to a circuit breaker having such a configuration, a driver groove (not shown) is activated, and the operating rod 8 is driven to the right, and the movable electrode connected to the operating rod 8 is activated. 12 and the fixed electrode 4 are separated and an arc is generated. On the other hand, as a result of the operating rod 8 being driven to the right,
The puffer cylinder 9 attached to the operating rod 8 is also driven to the right, the arc-extinguishing gas in the compression chamber is compressed, and the gas is blown from the gas outlet of the puffer cylinder. The arc generated at 12 is extinguished.

(Problems to be Solved by the Invention) By the way, in the gas circuit breaker as described above, since the bearing portion 19 of the buff 7 piston 10 is provided at both ends, the exhaust lower of the operating rod 8 is connected to the outside of the bearing portion 19. Since the operating rod 8 had to be made longer in the longitudinal direction to exhaust gas.

In addition, since the current-carrying contact 14 provided on the outer periphery of the puffer cylinder 9 is finger-shaped, the inter-electrode insulating tube 1 housing the puffer cylinder 9 must be extended to the outside of the current-carrying contact 14. The insulation cylinder 1 was also formed to be long, and the circuit breaker metal body was accordingly increased in size.

Furthermore, when the inter-electrode insulating tube 1 becomes longer, the thickness of the inter-electrode insulating tube 1 must be increased in order to maintain the strength of the inter-electrode insulating tube 1, which places a burden on the support of the inter-electrode insulating tube 1. Not only is it expensive, but it is also difficult to handle.

Further, since the connection portion between the conductor connection portion 15 and the inter-electrode insulating cylinder 1 is connected by bolt fastening, the number of parts such as bolts increases, and a great deal of effort is required for connection work and parts management.

The present invention was proposed in order to solve the problems of conventional gas circuit breakers as described above.The purpose of the present invention is to provide a gas circuit breaker that is simple in construction, has a small number of parts, is compact, and has high reliability. may be provided.

[Structure of the Invention] (Means for Solving the Problems) The gas circuit breaker of the present invention has a gas circuit breaker having a structure between the movable side contact part and the fixed side contact part, from the fixed side contact part to the vicinity of the movable electrode of the movable side contact part. forming an inter-electrode insulating cylinder with a length that reaches the length of the inter-electrode insulating cylinder, attaching a mounting part to the movable electrode side end of the inter-electrode insulating cylinder, arranging a puffer piston and a puffer cylinder within this mounting part,
A conductor part that connects to the outside of the circuit breaker is integrally formed on the outer periphery of the mounting part, and a groove is roughly provided on the inner peripheral wall of the mounting part, and a current-carrying contact such as a multi-glue contact is inserted into this groove. A ring fitting hole is formed on both sides, and a bearing made of an organic material such as Teflon is fitted into the fitting hole.

(Function) In the gas circuit breaker of the present invention, the buff 7 piston and the puffer cylinder, which were conventionally arranged inside the interpole insulating cylinder, are disposed inside the mounting part outside the interpole insulating cylinder, and the energizing contact is installed. Since it is provided on the inner circumferential wall of the mounting portion of the interpole insulating tube, it is possible to shorten the interpole insulating tube, and accordingly, the operating rod can be shortened, thereby making it possible to downsize the circuit breaker.

(Example) Next, an example of the gas circuit breaker of the present invention will be described with reference to FIGS. 1 and 2.

Note that the same parts as those in the prior art are given the same reference numerals and the description thereof will be omitted.

Configuration of the present embodiment* Fig. 1 is a cross-sectional view showing the arc extinguishing chamber of the buffer type gas circuit breaker according to the present invention, and Fig. 2 is a detailed view of the interpolar insulating cylinder mounting bracket.

In FIG. 1, an inter-electrode insulating cylinder 21 is provided between the movable electrode 12 and the fixed electrode 4 that constitute the main interrupting part, and one end of this inter-electrode insulating cylinder 21 is supported by the base end of the fixed displacement 4. , the other end is disposed near the outer side of the end surface of the piston 10.

An attachment portion 22 of the inter-electrode insulating tube 21 is attached to the end of the inter-electrode insulating tube 21 on the side of the movable electrode 12, and the buff 7 piston 10 and the puffer cylinder 9 are disposed within the attaching portion 22. Further, a conductor portion 23 for electrically connecting with the outside is attached to a part of the outer circumference of the mounting portion 22, and a locking portion 24 for fitting into the inter-electrode insulation tube 21 is formed at the tip. These conductor portions 23 and locking portions 24 are connected to the mounting portion 22.
It is integrally formed with.

Furthermore, as shown in FIG.
That is, on the inner wall between the locking part 24 and the conductor part 23,
A groove 26 is formed into which the current-carrying contact 25 is inserted. Into this groove 26 is inserted an energizing contact 25 (for example, a multi-glue contact) having a ring-shaped spring protrusion extending in the direction of the groove formed in the center thereof. Furthermore, ring fitting holes 27 and 28 are provided at both ends of this groove 26, and these fitting holes 2
7.28 is fitted with a ring 29.30 which is provided on the outer periphery of the puffer cylinder 9 and has been subjected to an organic treatment such as Teflon treatment. The rings 29 and 30 act as bearings for the puffer cylinder 9 and at the same time serve as dust guards to prevent dust and friction dust from the puffer cylinder 9 from entering into the interpolar insulating cylinder 21.

Effect of this embodiment * In the gas circuit breaker of this embodiment configured as described above, a current-carrying contact is provided on the inner circumferential wall of the mounting portion 22 of the inter-electrode insulating tube 21, and both ends of the current-carrying contact 25 are By fitting the processed organic material ring 29.30 such as deflon into the
The rings 29 and 30 not only act as a bearing and a dust guard, but also prevent the corners of the current-carrying contact 25 from coming into contact with each other, thereby preventing the current-carrying contact 25 from being bent too much.

In addition, since the bearing is provided on the outer periphery of the puffer cylinder 9, there is no need to provide a bearing on the operating rod 8.
Since the exhaust lower part of the operating rod 8 can be formed close to the movable electrode 12 side, the length of the operating rod 8 can be shortened, and the distance between the main cutoff part and the exhaust lower part is shortened, so gas flow is improved. This makes it easier and improves the cut-off state.

Further, the conventional energizing contact 14 was finger-shaped and provided on the outer periphery of the puffer cylinder 9, but in this embodiment, the energizing contact 25 has a ring-shaped spring protrusion formed in the center.
By providing this on the inner circumferential wall of the mounting portion 22 of the inter-electrode insulating tube 21, the inter-electrode insulating tube 21 can be shortened to near the movable electrode 12. As a result, the strength of the inter-electrode insulating tube 21 is increased compared to the conventional one, so that the thickness of the inter-electrode insulating tube 21 can be made thinner than that of the conventional one, and the number of members can be reduced.

In addition, by integrally forming the locking part of the mounting part 22,
The number of parts can be reduced, and labor for parts installation, parts management, etc. can be saved. Furthermore, since the inter-pole insulating tube 21 and the operating rod 8 can be shortened as described above, the circuit breaker can be made smaller in the longitudinal direction.

*Other Examples* In this example, the shape of the current-carrying contact is plate-like and has a ring-shaped spring protrusion in the direction of the groove in the center, but the shape of the current-carrying contact is limited to this example. It is not necessary to use a power supply as long as it can perform the function of energizing.

[Effects of the Invention] As described above, according to the present invention, the puffer cylinder and the puffer piston are disposed inside the mounting part of the interpole insulating cylinder, so the interpolar insulating cylinder and the operating rod can be shortened, and the mounting part is further insulated. By integrally forming the locking part of the cylinder, the number of parts can be reduced, and it is possible to provide a compact and reliable gas circuit breaker with improved interrupting performance and an elegant design.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the gas circuit breaker of the present invention;
FIG. 2 is a partially enlarged cross-sectional view showing the recessed part of the inter-electrode insulating tube shown in FIG. 1, and FIG. 3 is a cross-sectional view showing a conventional gas circuit breaker. 1... Insulating cylinder between poles, 2... Fixed side contact part, 3...
Movable side contact part, 4... Fixed electrode, 5... Terminal, 6...
... Insulating rod, 7... Exhaust port, 8... Operating rod, 9... Puffer cylinder, 10... Puffer piston, 11... Buffer to, 12... Movable electrode, 1
3... Insulating nozzle, 14... Current-carrying contact, 15...
・Conductor connection part, 16... Mounting part, 17... Bolt,
18... Insulating tube, 19... Bearing part, 21... Interpole insulating tube, 22... Mounting part, 23... Conductor part, 24...
... Locking part, 25 ... Current-carrying contact, 26 ... Groove, 2
7.28...Ring fitting hole, 29.30...Ring.

Claims (1)

[Claims] A fixed side contact part and a movable side contact part are arranged in a metal container filled with an arc-extinguishing gas, and are formed by a puffer piston and a puffer cylinder as the movable side contact part cuts off. A gas circuit breaker that extinguishes the arc by compressing the gas in the puffer chamber and spraying this gas onto the arc generated between the fixed electrode on the fixed side contact part and the movable electrode on the movable side contact part. In this method, an inter-electrode insulating cylinder is formed between the puffer piston of the movable side contact part and the fixed-side contact part, a mounting part is attached to the movable electrode side end of this inter-electrode insulating cylinder, and the puffer is inserted into this mounting part. In addition to disposing the piston and puffer cylinder, a conductor part that connects to the outside of the circuit breaker is integrally formed on the outer periphery of the mounting part, and a groove is provided on the inner peripheral wall of the mounting part, and the current-carrying contact is inserted into this groove. A gas circuit breaker characterized in that a ring fitting hole is formed on both sides of the groove, and a bearing made of an organic material is fitted into the fitting hole.