JPH0332026Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to a puffer-type gas circuit breaker that extinguishes an arc by spraying an insulating gas onto the arc, and in particular, a puffer-type gas circuit breaker that is designed to improve the structure of the arc extinguishing chamber member. It is related to vessels.

[Technical background of the invention and its problems] In recent years, there has been a strong demand for improved reliability of gas circuit breakers, and the shape of circuit breakers is becoming smaller and the number of breaking points is becoming smaller. This trend has led to a reduction in the number of parts in circuit breakers, and the resulting reduction in assembly man-hours has led to the creation of methods for improving reliability.

FIG. 3 is a sectional view showing an example of a conventional puffer type gas circuit breaker. 1 in the figure is an insulating gas (for example,
A cylindrical metal grounded tank filled with _SF6 gas, etc. Reference numeral 2 denotes a cover plate provided at the opening on one end side of the grounded tank 1. The opening on the other end side of the grounded tank 1 is closed with a lid. The ground tank 1 has a fixed contact side member 3 and a movable contact side member 4, and an insulating cylinder 5 that electrically insulates them and mechanically holds them, and a fixed contact from the outside of the circuit breaker. A conductor connecting portion 6 for electrically connecting to the side member 3 and the movable contact side member 4, and an insulating tube 7 for mechanically supporting these are provided, and this insulating tube 7 is fixed to the cover plate 2. I support it. On the outer surface side of the grounding tank 1 of the cover plate 2, there is an insulating rod 8 which communicates with the insulating tube 7 and is connected to the movable contact side member 4, and this insulating rod 8 is connected to the movable contact side member. A container 10 is attached to accommodate the connecting portion 9 that supports the connecting portion 9 so as to be movable forward and backward in four directions. Further, an operating mechanism section 11 is fixed to the container 10 for operating the insulating rod 8 to move the movable contact side member 4 forward and backward relative to the fixed contact side member 3.

In such a conventional circuit breaker, two insulating tubes 5 and 7 are prepared separately, while both insulating tubes 5 and 7 are prepared separately.
Further, when the movable contact side member 4 is retracted from the fixed contact side member 3, an insulating gas is compressed to form a fixed contact from the tip of the movable contact side member 4 to the conductor connecting portion 6 between the movable contact side members 4. A fixed piston 12a and a puffer cylinder 1 for forming a puffer mechanism that blows out compressed gas to the child side member 3 and blows out the arc.
2b, since the current-carrying contact member 13 and the like are provided to establish electrical contact between the movable contact side member 4 and the conductor connecting portion 6, the number of parts becomes extremely large;
There are also disadvantages in that the number of assembly steps is increased, the assembly is time-consuming, reliability is lowered, and costs are increased, and the diameter of the blocking portion is increased.

[Purpose of the invention] This invention was created in view of the above circumstances.
The object is to provide a grounded tank type puffer type gas circuit breaker which has a small number of parts and can therefore reduce assembly man-hours and improve reliability.

[Summary of the invention] In other words, in order to achieve the above purpose, the present invention:
When a movable contact installed in a metal container filled with arc-extinguishing gas shuts off, the gas in the cylinder is compressed, and this gas is sprayed onto the arc generated between it and the fixed contact to extinguish the arc. In an arc-shaped circuit breaker, the movable and fixed contacts of the circuit breaker are housed in an insulating container, and an inner flange is provided in the middle of the insulating container, and the insulating container is in sliding contact with the inner wall thereof. A piston is provided, the piston is attached to a rod slidably disposed through the inner flange, and a movable contact is attached to the piston, so that the operating mechanism of the movable contact can perform a shutoff operation via the rod. At the time, the gas is compressed between the inner flange and the gas is sprayed onto the arc contact of the fixed contact, and the insulating container is attached to a lid plate covering one end of the metal container. The insulated container is used as a cylinder for the power supply mechanism to make it more compact, and the connecting part to the operating mechanism is housed within the insulation container, so that most of the circuit breaker components are housed within this insulation container. This structure simplifies the structure and simplifies the insulation with the metal container and the support structure, thereby making the circuit breaker smaller, reducing assembly man-hours, and increasing reliability. Try to aim for it.

[Embodiment of the invention] An embodiment of the invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of the puffer type gas circuit breaker according to the present invention, showing the state near the final stroke of the circuit breaker. In the figure, the same parts as in FIG. 3 are given the same reference numerals, and will not be explained again here.

In the figure, 14 has one end 15 connected to the tank 1.
It is an insulating cylinder that is mechanically fixed only by being attached to the cover plate 2 on the operating mechanism 11 side, and the other end 16 is electrically connected to the outside of the circuit breaker via the fixed contact side member 3. One conductor 17 of the pair of conductors 17 and 30 is connected so as to be inserted, and an inner flange 2 for forming a compression chamber of the puffer cylinder is provided inside the middle part of the insulating cylinder 14.
1 is formed. This inner flange 21 has an operating rod 22 in its central hole for transmitting operating force of the operating mechanism 11.
is slidably inserted. In addition, the inner tsuba 2
A connecting member 40 made of a metal material is embedded in the connecting member 1 for electrically connecting the operating rod 22 and the conductor connecting portion 6 into which the conductor 30 outside the insulating tube 14 is inserted. The connecting member 40 is provided with a sliding contact portion 29 and an airtight sliding portion 41 on the inside, and a portion thereof is located outside the insulating tube 14 and connected to the conductor connecting portion 6. 20 is a movable piston, and the operating rod 2
When the operating mechanism 11 is shut off, the insulating rod 8 and operating rod 22
By receiving the operating force through the puffer cylinder, it slides inside the insulating cylinder 14 forming the puffer cylinder, and compresses the gas between it and the inner flange 21. The movable piston 20 is provided with a hole 23 for blowing out compressed gas, and an insulating nozzle 2 is provided on the side of the movable piston 20 facing the fixed contact side member 3 so that the hole 23 is located inside.
4 is installed. In addition, the movable piston 2
A movable arc contactor 25 is attached to the opposite surface side of the fixed contactor side member 3 of No. 0 at the center thereof. Therefore, the compressed gas moves to the movable piston 2
The movable arc contact 25 and the fixed arc contact 27 provided on the fixed contact side member 3 are connected to each other through the hole 23 provided at The arc 28 generated during this period is blown and cut off. The current flowing through the circuit breaker is guided from the movable piston 20 through a portion of the operating rod 22 to the other conductor 30 via the sliding contact portion 29 of the connecting member 40 provided in the inner collar 21.

When an arc 28 is generated between the arc contacts of the fixed and movable contact members 3 and 4, this current flows from the movable piston 20 through the movable arc contact 25, the arc 28, and the fixed arc contact 27 to the fixed contact. to the child side member 3, and when charging, the movable piston 20
The flow passes through the movable current-carrying contact 32 and the fixed current-carrying contact 33, and a portion is also branched off to both arc contacts and guided to the fixed contact side member 3, and then further connected to the conductor from the fixed contact side conductor connection portion 42. Leads to 17.

Furthermore, for the sliding contact portion 29 inside the inner flange 21, anything suitable for the purpose, such as a normal finger-shaped contact or a multiple contact, can be used, but in order to reduce the radial dimension, Multiple contacts are particularly suitable.

This device with such a configuration has one insulating tube 14.
directly fixes or supports almost all the members in the grounding tank 1, such as the fixed contact side member 3, the movable contact side member 4, and the conductor connection part, and when disconnecting, the fixed contact side member 3 and the movable contact side member 4 and between the charging part and the ground tank 1, and also between the charging part and the ground tank 1 when turned on, and also serves as the cylinder of the puffer mechanism. The inner flange 21 of the insulating cylinder 14 has a built-in sliding contact portion for slidingly supporting the operating rod 22 and maintaining airtightness. Therefore, structurally, the number of components is reduced compared to conventional devices, which improves reliability, and since most of the main components are housed within the insulating tube 14, assembly of this part is extremely easy. Furthermore, since the insulating tube is attached and fixed to the lid plate on the operating mechanism side, the support structure is also extremely simplified. In addition, since the insulating tube 14 is configured to also serve as a cylinder for the puffer mechanism, there is no need to take the trouble to provide a puffer cylinder as in the past.
4 can be made smaller in diameter accordingly, and therefore, the insulation distance from the grounded tank 1 can be increased, and the dielectric strength can be improved.

Next, another embodiment of the present invention will be shown.

Here, instead of the configuration shown in FIG. 1, the part 35 that insulates between the fixed contact side member 3 and the movable contact side member 4 of the integrally structured insulating cylinder 14 is made a large diameter part, and the live part and the ground tank are The portion 36 that performs insulation between the holes 1 and 1 is a small diameter portion. Other parts have been changed due to this change in shape, but are basically the same as in FIG. 1.

By providing such a small diameter portion, the distance between the conductor connection portion 6 and its fixing member with respect to the ground tank 1 can be increased, so that the dielectric strength with respect to the ground tank 1 can be improved.

[Effects of the invention] As detailed above, according to the invention, almost all the constituent members of the interrupting part are fixed or supported within a single insulating cylinder, and there is a In addition to performing the multi-functional function of providing insulation, the insulating tube also serves as a fixed wall for the puffer cylinder, which simplifies the structure and allows parts such as the operating rod, current-carrying contact, and conductor connection to be placed outside the insulating tube. Since it can be fixed from the ground, it is possible to significantly reduce the number of parts in the circuit breaker, reduce assembly man-hours, and create a compact, grounded tank type power gas circuit breaker that is inexpensive and highly reliable. can be provided.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a sectional view showing a modification of the present invention, and FIG. 3 is a sectional view showing a conventional example. 1...Grounding tank, 3...Fixed contact side member,
4...Movable contact side member, 6...Conductor connection part, 8
... Insulating rod, 11 ... Operating mechanism, 14 ... Insulating cylinder, 17, 30 ... Conductor, 18 ... Hole, 20 ...
...Movable piston, 21...Inner flange, 22...Operation rod, 23...Hole, 24...Insulating nozzle, 25...
...Movable arc contact, 27...Fixed arc contact, 28...Arc, 29...Sliding contact portion, 3
2... Movable current-carrying contact, 33... Fixed current-carrying contact, 40... Connection member, 41... Airtight sliding part, 4
2... Fixed contact side conductor connection part.

Claims (1)

[Claims for Utility Model Registration] (1) When a movable contact installed in a metal container filled with arc-extinguishing gas is cut off, the gas in the cylinder is compressed, and this gas is transferred to a fixed contact. In this circuit breaker, the movable and fixed contacts of the circuit breaker are housed in an insulating container, and the insulating container has an inner flange in the middle thereof, and A piston that slides on the inner wall of the insulating container is provided, and the piston is attached to a rod that is slidably disposed through the inner flange, and a movable contact is attached to the piston. The structure includes a puffer mechanism that compresses the gas between the operating mechanism and the inner flange and sprays it onto the arc contact of the fixed contact when the operating mechanism performs a shutoff operation via the rod;
A grounded tank type puffer type gas circuit breaker, characterized in that the insulating container is attached to a lid plate that covers one end of the metal container. (2) The insulating cylinder has a large diameter part and a small diameter part, and the fixed and movable contacts are housed in the large diameter part, and the charging part of the movable contact and the connecting part of the operating mechanism that operates the movable contact are located in the small diameter part. 1. A grounded tank type puffer type gas circuit breaker according to claim 1, which is housed in a utility model.