JP2002298709A - Puffer type gas circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce unevenness in temperature of a container by suppressing uneven temperature of an arc-extinguishing gas exhausted from a side surface of an exhaust tube and sufficiently cooling an arc-extinguishing gas passing through the exhaust tube. Provided is a puffer-type gas circuit breaker that reduces costs. SOLUTION: A second contact portion 3 inside an exhaust pipe 21 is provided.
A turbulence generator 23a is provided between the arc contact 7 on the side and the opening 21a. The turbulence generator 23a is composed of one or a plurality of straight or curved rods, and is fixed to the exhaust pipe 21 by supports 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a puffer type gas circuit breaker, and more particularly to a puffer type gas circuit breaker having an improved exhaust pipe for discharging high-temperature arc-extinguishing gas from a contact portion side.

[0002]

2. Description of the Related Art A puffer type gas circuit breaker is conventionally known as a device for turning on and off a large current contact. The puffer type gas circuit breaker is characterized in that an arc extinguishing gas is injected into an arc generated at the time of a breaking operation to extinguish the arc. Here, a conventional example of a puffer type gas circuit breaker will be specifically described with reference to FIG. FIG. 7 is a cross-sectional view of the current interrupting part of the conventional puffer type gas circuit breaker during the interrupting operation. In the figure, a driving unit for driving the current interrupting unit is omitted.

As shown in FIG. 7, a puffer type gas circuit breaker is provided with a container 1 filled with an arc-extinguishing gas. A flange 22 is disposed on one side of the container 1, and a contact base 12 is fixed to the side of the container 1 facing the flange 22 via an insulating tube 11. An operation rod 15 is slidably penetrated through the contact base 12.
Is installed. The other end of the operating rod 15 is connected to a driving unit (not shown) outside the container 1 via an insulating rod 16. An insulating tube 13 extending toward the flange 22 is attached to the contact base 12 on the opposite side of the insulating tube 11, and a contact base 14 is insulated and supported at the tip of the insulating tube 13. A second contact base 14 faces the first contact portion 2.
The contact part 3 is attached.

The first contact portion 2 and the second contact portion 3 come into contact with and separate from each other as the first contact portion 2 slides together with the operating rod 15. It is configured as follows. Each of these contact portions 2 and 3 has an energizing contact 4 that is energized at the time of contact.
5 and arc contacts 6, 7 for guiding an arc 8 generated between the contact portions 2, 3 during the separating operation.

[0005] The first contact portion 2 is provided with a puffer piston 9 and a puffer cylinder 10 for compressing the arc-extinguishing gas during the separating operation. The puffer piston 9 is fixed to a contact base 12, and the puffer cylinder 10 is fixed to an operation rod 15. The space surrounded by the puffer piston 9, the puffer cylinder 10, and the operation rod 15 is a puffer chamber 18 for pressurizing the arc-extinguishing gas. An insulating nozzle 17 is fixed to the tip of the operating rod 15. Insulation nozzle 1
Reference numeral 7 denotes a member for converging the arc-extinguishing gas compressed in the puffer chamber 18 to the arc 8 between the arc contacts 6 and 7.

Further, the contact base 14 is provided with an opening 14a, which communicates with the opening 14a.
0 is fixed. The exhaust tube 20 has openings formed at both end surfaces, one opening is connected to the opening 14 a of the contact base 14, and the other opening is connected to the flange 22.
It is arranged so that it may face. That is, the exhaust pipe 20 is configured to take in the arc-extinguishing gas from the arc contacts 6 and 7 and discharge the gas toward the flange 22 of the container 1.

As another conventional example of a puffer type gas circuit breaker, an insulator such as a spacer or a device such as a current transformer is disposed at the position of the flange 22. In this case, It is not possible to blow hot arc-extinguishing gas directly from the exhaust stack 20 to them. Therefore, as shown in FIG. 8, an exhaust pipe 21 having an opening facing the flange 22 and an exhaust opening 21 a formed on a side surface is fixed to the contact base 14. In such a conventional example, a high-temperature arc-extinguishing gas can be discharged not in the flange 22 side but in the radial direction from the opening 21a.

In the conventional example of the puffer type gas circuit breaker having the above-described structure, the following operation is performed during the breaking operation. That is, the driving unit (not shown) is
When the first contact portion 2 is driven via the operating rod 15, the first contact portion 2 moves in a direction away from the second contact portion 3, and a puffer cylinder fixed to the first contact portion 2. 10 moves toward the puffer piston 9 and compresses the arc-extinguishing gas in the puffer chamber 18.

Then, the insulating nozzle 17 injects the compressed arc-extinguishing gas as a gas flow toward the arc 8 to cool and extinguish the arc 8. At this time, in the conventional example shown in FIG. 7, the exhaust pipe 20 exhausts the arc-extinguishing gas heated to a high temperature by the heat of the arc 8 into the vessel 1 from between the arc contacts 6 and 7 as shown by an arrow 27. Further, in the conventional example shown in FIG.
In this case, the arc-extinguishing gas is exhausted into the container 1 through the opening 21a from between the arc contacts 6 and 7 as shown by arrows 25 and 26.

[0010]

The exhaust stack 2
When the high-temperature arc-extinguishing gas is passed through 0, 21, the high-temperature arc-extinguishing gas is cooled by mixing with the normal-temperature arc-extinguishing gas. Therefore, the temperature of the arc-extinguishing gas decreases in proportion to the distance that the gas passes through the exhaust pipes 20 and 21. Exhaust stack 20
Since the openings are formed at both end surfaces, all the arc-extinguishing gas exhausted from the exhaust pipe 20 passes through the same distance, and the arc-extinguishing gas is uniformly cooled.

On the other hand, the exhaust cylinder 21 having the opening 21a on the side face has the following problems. In other words, in the opening 21a, the distance through which the arc-extinguishing gas passes through the exhaust pipe 21 differs between near the end near the second contact portion 3 and near the end near the flange 22. Therefore, the opening 21
The temperature of the arc-extinguishing gas discharged from a becomes uneven.

More specifically, in the arc-extinguishing gas discharged from the opening 21a, a portion close to the second contact portion 3 as indicated by an arrow 25 has a short distance passing through the exhaust pipe 21. Therefore, the cooling effect of the exhaust pipe 21 is small, and the arc-extinguishing gas is discharged into the container 1 while the temperature is high. Conversely, as shown by the arrow 26, at a portion far from the second contact portion 3 (a portion close to the flange 22), a distance passing through the exhaust pipe 21 is long. Therefore, the cooling effect of the exhaust pipe 21 is large, and the arc-extinguishing gas is discharged into the container 1 in a state where the temperature is lowered.

In the case where the temperature of the arc-extinguishing gas discharged from the opening 21a of the exhaust pipe 21 varies as described above, the dielectric strength decreases as the temperature of the arc-extinguishing gas increases, so that the temperature of the arc-extinguishing gas increases. On the other hand, the container 1 must be designed on the basis of the temperature of the arc-extinguishing gas (arrow 25) having a short passage distance in the exhaust pipe 21. As a result, in the conventional example having the exhaust pipe 21, the diameter of the container 1 needs to be set to be considerably larger than the insulation distance required for the arc-extinguishing gas at room temperature. Therefore, there has been a problem that the container 1 becomes large in size and causes an increase in manufacturing cost.

The present invention has been proposed in order to solve the above-mentioned problems. The present invention suppresses uneven temperature of an arc-extinguishing gas exhausted from a side surface of an exhaust pipe and suppresses arc-extinguishing gas passing through the exhaust pipe. It is an object of the present invention to provide a puffer type gas circuit breaker in which the diameter of a container is reduced and the manufacturing cost is reduced by sufficiently cooling the gas.

[0015]

In order to achieve the above-mentioned object, the present invention provides a container filled with an arc-extinguishing gas, and a first contact portion provided in the container so as to be able to contact and open. And a second contact portion are provided. Each of these contact portions is provided with an energizing contact for energizing at the time of the contact and an arc contact for inducing an arc generated between both contact portions at the time of the separating operation. The first contact portion is provided with a puffer piston and a puffer cylinder for compressing the arc-extinguishing gas during the opening operation and injecting the arc into the arc.
In the puffer type gas circuit breaker provided with an exhaust pipe for discharging the arc-extinguishing gas heated to a high temperature by the heat of the arc into the container from between the arc contacts, It has such technical features.

According to a first aspect of the present invention, an exhaust opening is formed in a side surface of the exhaust pipe, and a space between the arc contact on the second contact portion side and the opening inside the exhaust pipe is provided. Is provided with a turbulence generator.

According to the first aspect of the present invention, since the turbulence generator is provided inside the exhaust pipe, even when the opening is formed on the side surface of the exhaust pipe, it is close to the second contact portion at the opening. Turbulence can be generated in the arc-extinguishing gas discharged from the portion, that is, the arc-extinguishing gas having a small passage distance through the exhaust stack. Therefore, even if the high-temperature arc-extinguishing gas passes only a short distance in the exhaust pipe, the high-temperature arc-extinguishing gas can be well mixed with the normal-temperature arc-extinguishing gas, and the arc-extinguishing gas can be sufficiently cooled. As a result, the arc extinguishing gas having a uniform temperature can be discharged from the opening. Thus, the diameter of the container can be minimized, and the manufacturing cost can be reduced.

According to a second aspect of the present invention, in the puffer type gas circuit breaker according to the first aspect, the turbulence generating device is formed of a rectangular column member having a rectangular cross section with a variable mounting angle.

According to the second aspect of the invention, by changing the mounting angle of the prism member, an optimum turbulence generation state can be obtained according to the size of the container. Therefore, the same prismatic member can be used for puffer type gas circuit breakers of different ratings. As a result, the components can be shared, and the cost can be further reduced.

According to a third aspect of the present invention, in the puffer type gas circuit breaker according to the first aspect, the turbulence generating device is composed of two cylindrical members having a circular cross section, and the two cylindrical members are mutually centered. It is characterized in that they are arranged so that the distance between them is less than twice the diameter of the cylinder.

According to the third aspect of the present invention, since the distance between the centers of the two cylindrical members is arranged within twice the diameter of the cylindrical members, the wakes of the arc-extinguishing gas flowing around each of the cylindrical members interfere with each other. Compete with each other. Therefore, with a simple and compact configuration,
Further, intense turbulence can be generated, and the cooling effect of the arc-extinguishing gas can be enhanced.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the drawings. In addition,
This embodiment relates to a puffer-type gas circuit breaker provided with an exhaust pipe 21 having an exhaust opening 21a formed on a side surface, as in the conventional example shown in FIG. Are denoted by the same reference numerals, and description thereof is omitted. Also,
In the following embodiments, a pair of arc extinguishing chambers will be described. However, the same applies to a puffer type gas circuit breaker in which three pairs of arc extinguishing chambers are arranged.

(1) First Embodiment: FIGS. 1 and 2 [Configuration] The first embodiment is a typical embodiment of a puffer type gas circuit breaker according to the present invention. It corresponds to. As shown in FIG. 1, a turbulence generator 23a is provided between the arc contact 7 on the second contact portion 3 side and the opening 21a inside the exhaust pipe 21. The turbulence generator 23a is composed of one or a plurality of straight or curved rods, and is fixed in the exhaust pipe 21 by supports 24.

[Functions and Effects] The functions and effects of the first embodiment having the above-described configuration are as follows. That is, the high-temperature arc-extinguishing gas ejected from the insulating nozzle 17 is
It passes between the energizing contact 5 and the arc contact 7 on the side of the second contact portion 3, passes through the opening 14 a of the contact base 14, and reaches the inside of the exhaust pipe 21. The portion close to 3 collides with the turbulence generator 23a, and the flow of the arc-extinguishing gas is disturbed, for example, as shown in FIG.

The arc-extinguishing gas colliding with the turbulence generator 23a forms a vortex wake behind the turbulence generator 23a,
Fluid mixing motion occurs and the high-temperature arc-extinguishing gas and exhaust stack 21
It mixes well with the room temperature gas. Therefore, even when the distance over which the high-temperature arc-extinguishing gas passes through the exhaust pipe 21 is short, the arc-extinguishing gas can be sufficiently cooled. On the other hand, of the arc-extinguishing gas passing through the exhaust
The portion far from the second contact portion 3 (the portion close to the flange 22) has a longer passage distance in the exhaust pipe 21, so that the cooling effect of the exhaust pipe 21 is large and the temperature of the arc-extinguishing gas is sufficient. Has fallen.

According to the first embodiment as described above, the turbulence generator 23a is provided in a portion of the exhaust pipe 21 close to the second contact portion 3, so that the arc-extinguishing gas is locally reduced. Since the turbulent flow is generated, the high-temperature arc-extinguishing gas discharged from the portion close to the second contact portion 3 can be reliably cooled. Accordingly, the exhaust pipe 21 uniformly cools the arc-extinguishing gas regardless of the distance through which the arc-extinguishing gas passes, and
It can be discharged into. As a result, the sufficiently cooled arc-extinguishing gas can maintain excellent dielectric strength, and the insulation distance between the exhaust stack 21 and the container 1 can be reduced. Thereby, the diameter of the container 1 can be reduced, and the manufacturing cost can be reduced.

(2) Second Embodiment FIGS. 3 and 4 [Configuration] The second embodiment is a puffer type gas circuit breaker according to the second aspect of the present invention, as shown in FIG. Another feature is that the turbulence generator 23b is composed of a prism member having a rectangular cross section with a variable mounting angle.

[Function and Effect] FIG. 4 is an example in which the arc-extinguishing gas flow around the turbulent flow generator 23b, which is a prismatic member, is visualized. As in the first embodiment, the turbulent flow generator 2 is used.
A spiral wake is formed behind 3b. Therefore,
Even if the high-temperature arc-extinguishing gas and the normal-temperature gas are mixed well due to the fluid mixing motion and the distance over which the high-temperature arc-extinguishing gas passes through the exhaust stack 21 is sufficiently cooled, the arc-extinguishing gas is sufficiently cooled. Can be.

In addition, in the second embodiment, since the angle (angle of attack) of the prism member with respect to the flow of the arc-extinguishing gas can be changed, it is possible to change the way of the wake. is there. That is, when the angle of attack of the prism member is zero degrees (the long side of the prism is parallel to the flow), the flow of the arc-extinguishing gas is relatively smooth, and the range in which the wake can be reduced. Then, as the angle of attack of the prism member is increased, the degree of turbulence of the flow of the arc-extinguishing gas increases, and the range in which the wake can be increased. Therefore, the cooling effect of the arc-extinguishing gas is also increased.

As described above, in the second embodiment, the turbulence generator 23 is changed from the prism member whose mounting angle can be changed.
By configuring b, it is possible to always obtain an optimal turbulence generation state. Therefore, the same prismatic member can be used for puffer-type gas circuit breakers of different ratings, and commonality of parts is realized. As a result, a puffer type gas circuit breaker at lower cost can be provided.

(3) Third Embodiment FIGS. 5 and 6 [Structure] The third embodiment corresponds to the invention of claim 3, and as shown in FIG. The device 23c is characterized in that it is composed of two columnar members having a circular cross section, and is arranged such that the distance between the centers is within twice the diameter of the column.

[Function and Effect] The third embodiment having the above configuration has the following unique function and effect. FIG.
This is a visualization of the flow of the arc-extinguishing gas around two cylindrical members. When the diameter of the cylindrical members is 10 mm, (a)
Is the distance between the centers of the cylindrical members 15 mm, (b) is the same 20 mm
These correspond to the third embodiment. In addition,
(C) is a turbulence generator 23d which is a comparative example with the third embodiment, in which the distance between the centers of two cylindrical members is 30 m.
m. As apparent from FIG. 6, the wakes of the upper and lower cylindrical members interfere with each other in (a) and (b), whereas the wakes of the upper and lower cylindrical members are independent in (c). are doing.

In general, it is known that when the distance between the centers of two cylinders is less than twice the diameter of the cylinders, the respective wakes mutually interfere. In other words, by arranging the two columnar members at a distance between the centers of not more than twice the diameter of the column, mutual interference of the wakes can be caused. An effect almost equivalent to the above can be exerted. That is, according to the third embodiment, by arranging the two cylindrical members so that the center-to-center distance is within twice the diameter, it is more excellent than the case where the two cylindrical members are simply arranged. A turbulence generation effect can be obtained. As a result, it is possible to reduce the size and commonality of parts, which can contribute to cost reduction.

(4) Other Embodiments The present invention is not limited to the above embodiments, and the shapes, dimensions, the number of members, etc., constituting the turbulence generator can be appropriately selected. In addition, the formation position of the exhaust opening on the side surface of the exhaust cylinder may be on the lower surface side of the exhaust cylinder.

[0035]

As described above, according to the present invention,
With a very simple configuration such as providing a turbulence generator between the arc contact on the second contact portion side and the exhaust opening inside the exhaust cylinder, the temperature of the arc-extinguishing gas exhausted from the side of the exhaust cylinder is reduced. It is possible to provide a puffer type gas circuit breaker in which unevenness can be suppressed, the arc-extinguishing gas passing through the exhaust pipe is sufficiently cooled, and the diameter of the container is reduced and the manufacturing cost is reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a puffer type gas circuit breaker according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a flow of an arc-extinguishing gas when the gas collides with a turbulence generator according to the first embodiment.

FIG. 3 is a sectional view of a puffer type gas circuit breaker according to a second embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a flow of an arc-extinguishing gas when the collision occurs with a turbulence generator according to a second embodiment.

FIG. 5 is a sectional view of a puffer type gas circuit breaker according to a third embodiment of the present invention.

FIGS. 6A and 6B are explanatory views showing flows of an arc-extinguishing gas when the turbulent flow generator collides with a turbulent flow generator according to a third embodiment and a turbulent flow generator according to a comparative example. FIGS. The flow of the arc-extinguishing gas when colliding with the generator, and (c) shows the flow of the arc-extinguishing gas when colliding with the comparative example.

FIG. 7 is a cross-sectional view of a conventional puffer type gas circuit breaker.

FIG. 8 is a cross-sectional view of a conventional puffer type gas circuit breaker having an exhaust pipe having an exhaust opening formed on a side surface.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Container 2 ... 1st contact part 3 ... 2nd contact part 4, 5 ... Electric contact 6,7 ... Arc contact 8 ... Arc 9 ... Puffer piston 10 ... Puffer cylinder 11, 13 ... Insulation cylinder 12, DESCRIPTION OF SYMBOLS 14 ... Contact base 15 ... Operating rod 16 ... Insulating rod 17 ... Insulating nozzle 18 ... Puffer chamber 20, 21 ... Exhaust tube 22 ... Flange 23a, 23b, 23c, 23d ... Turbulence generator 24 ... Support 25, 26, 27 ... Arc extinguishing gas flow

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takuro Shiomi 2-1 Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside the Toshiba Hamakawasaki Plant (72) Inventor Goichi Iwata No. 2, Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa No. 1 F-term in Toshiba Hamakawasaki Plant (reference) 5G001 AA06 AA07 AA08 BB04 CC03 EE01 EE13

Claims (3)

[Claims] A container filled with an arc-extinguishing gas is provided, and a first contact portion and a second contact portion provided so as to be able to contact and separate from each other are arranged in the container. An energizing contact that energizes at the time of the contact, and an arc contact that guides an arc generated between the two contact portions during the separating operation are provided, and the first contact portion includes the arc contact during the separating operation. A puffer piston and a puffer cylinder for compressing the arc-extinguishing gas and injecting the arc into the arc are provided,
In the puffer type gas circuit breaker provided with an exhaust pipe for discharging the arc-extinguishing gas heated to a high temperature by the heat of the arc from between the arc contacts to the second contact portion, An exhaust opening is formed in a side surface of the cylinder, and a turbulence generator is provided between the arc contact on the second contact portion side and the opening inside the exhaust cylinder. Puffer type gas circuit breaker. 2. A puffer type gas circuit breaker according to claim 1, wherein said turbulence generator is constituted by a prism member having a rectangular cross section with a variable mounting angle. 3. The turbulence generating device is composed of two cylindrical members having a circular cross section, and the distance between the centers of the two cylindrical members is equal to the diameter of the cylindrical member.
The puffer type gas circuit breaker according to claim 1, wherein the gas circuit breaker is arranged so as to be within double the size.