JP2002025400A - Buffer type gas-blast circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a buffer type gas-blast circuit breaker which expedites its cooling and improve breaking performance by heightening acceleration of arc flow through generation of high-pressure part in the arc in a narrow range. SOLUTION: A gas flow path 17 is formed so as to have its flow path center axis B almost vertical to a driving axis A of the circuit breaker, and consists of a blow-off path 19 furnished with a nozzle opening to an arc-generating space between a fixed-side arc terminal 2 and a movable-side arc terminal 7 in a current break, and a main flow path 18 formed so that the flow path center axis is almost parallel to the circuit breaker driving axis A and communicating a buffer chamber 5 and the blow-off path 19. Then, the blow-off path 19 is constructed so that the length of the flow path center axis B is to be twice or more of the width D of the nozzle 20.

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 an arc-extinguishing gas blowing structure for improving a breaking performance.

[0002]

2. Description of the Related Art FIG.
FIG. 4 is a schematic cross-sectional view showing an open state and a closed state in a conventional puffer type gas circuit breaker described in Japanese Patent Publication No. 3 (JP-A) No. 3 (1999) -1995. Figure 1
In 6, 1 is a fixed contact, 2 is a fixed-side arc contact provided at the axial position of the fixed contact 1, 3 is a piston, 4 is fitted to the piston 3 and a puffer chamber 5 is fitted together with the piston 3. Is a movable contact arranged coaxially with the fixed contact 1 and opposed to the fixed contact 1 so as to be able to contact and separate from the fixed contact 1, and 7 is an inside of the movable contact 6 A movable arc contact provided coaxially with the movable contact 6 so as to face the fixed arc contact 2;
Reference numeral 8 denotes an insulated nozzle extending from the tip of the puffer cylinder 4 to the fixed contact 1 side, and 9 denotes an inner nozzle extending from the tip outer peripheral portion of the movable arc contact 7 to the fixed arc contact 2 side. It is. In the conventional puffer type gas circuit breaker, the fixed contactor 1 and the fixed-side arc contactor 2 are insulated and supported coaxially in a metal tank 12 as an airtight container. 6 and a movable-side arc contact 7 are fitted into a piston 3 that is insulated and supported in a metal tank 12, opposed to the fixed contact 1 and the fixed-side arc contact 2, and the fixed contact 1 and the fixed-side arc It is disposed so as to be able to contact and separate from the contact 2,
It is configured. Then, in the metal tank 12, S
Arc-extinguishing gas such as F ₆ gas is filled. The closed state of the puffer type gas circuit breaker is shown below the center line in FIG. 16, and the open state is shown above the center line in FIG.

Next, the operation of the conventional puffer type gas insulated circuit breaker constructed as described above will be described. First,
When a closing command is issued, the movable contact 6 (puffer cylinder 4) is driven by a driving device (not shown), and the puffer cylinder 4, the movable contact 6 and the movable arc contact 7
Moves from the state shown above the middle line in FIG. 16 to the left side. The movable contact 6 and the movable-side arc contact 7
Are fitted to the fixed contact 1 and the fixed-side arc contact 2, respectively, and as shown in the lower part of the center line in FIG. As a result, current is supplied so as to flow between the fixed contact 1 and the movable contact 6 and between the fixed-side arc contact 2 and the movable-side arc contact 7. Then, when there is an opening command, the movable contact 6 (puffer cylinder 4) is driven by the driving device, and the puffer cylinder 4, the movable contact 6 and the movable arc contact 7 are moved.
Moves from the state shown below the midline in FIG. 16 to the right side. As the movable contact 6 and the movable arc contact 7 move, the volume of the puffer chamber 5 is gradually reduced, and the arc-extinguishing gas in the puffer chamber 5 is compressed by the piston 3. In this opening operation, the fixed contact 1 and the movable contact 6 are first opened, and the fixed-side arc contact 2 is slightly delayed therefrom.
And the movable side arc contact 7 is opened. Therefore, the current flowing between the poles is ignited between the fixed-side arc contact 2 and the movable-side arc contact 7 to generate an arc. And
The arc-extinguishing gas compressed in the puffer chamber 5 is blown to the arc from the outlet 11 through the gas flow path 10, the arc is cooled, and the current is cut off. Further, the movable contact 6 and the movable-side arc contact 7 move rightward in FIG. 16 and are brought into an open state shown above the center line in FIG.

[0004]

In the conventional puffer type gas circuit breaker, there is no description about the effect of the arc-extinguishing gas blowing angle on the arc and the width of the gas flow path 10, and the arc-extinguishing gas is not used. How the arc is blown is not fully considered. The arc generated between the fixed and movable arc contacts 2, 7 is
By blowing the arc-extinguishing gas, the acceleration of the flow of the arc in the portion where the arc-extinguishing gas is blown is increased, so that the cooling is promoted and the arc is extinguished. Therefore, when the puffer chamber pressure of the blown-out arc-extinguishing gas is the same, the change in the flow velocity and the pressure affects the breaking performance, and the difference in the blowing method is an important factor affecting the breaking performance. . In the conventional puffer type gas circuit breaker, these points are not sufficiently considered.
There was a problem that efficient arc extinguishing could not be obtained.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. By devising the shape of a gas flow path, a high pressure portion is generated in an arc in a narrow range, and the acceleration of the arc flow is increased. It is an object of the present invention to obtain a puffer-type gas circuit breaker which can promote its cooling by improving its performance and improve its breaking performance.

[0006]

A puffer type gas circuit breaker according to the present invention has a closed container filled with an arc-extinguishing gas, and is insulated and supported in the closed container and arranged coaxially with a circuit breaker drive shaft. A fixed contact, a fixed-side arc contact coaxially and integrally provided with the fixed contact inside the fixed contact, a piston disposed insulated and supported in the closed container; and A puffer cylinder that is fitted coaxially with the circuit breaker drive shaft and forms a puffer chamber together with the piston, coaxial with the circuit breaker drive shaft, and opposed to the fixed contact, A movable contact disposed removably in the closed container; and a movable arc coaxially provided on the movable contact inside the movable contact so as to face the fixed arc contact. Contact and the above An insulating nozzle extending from the front end of the facylinder to the fixed contact side, and extending from the outer peripheral end of the movable arc contact to the fixed arc contact side inside the insulating nozzle; At the time of current interruption, an inner nozzle that constitutes a gas flow path for blowing the arc extinguishing gas in the puffer chamber onto an arc generated between the fixed-side arc contact and the movable-side arc contact together with the insulating nozzle. In the puffer-type gas circuit breaker provided with, the gas flow path is formed so that a flow path central axis is substantially perpendicular to the circuit breaker drive axis, and the fixed-side arc contact at the time of current interruption and the gas flow path A blow-off flow path having a blow-out opening that opens into an arc generating space between the movable-side arc contact and a flow path central axis formed substantially parallel to the circuit breaker drive axis; And a main flow path communicating with the blow-out flow path, wherein the blow-out flow path is configured such that the length of the flow path central axis is at least twice the width of the blow-out port. It is.

[0007] The insulating nozzle and the inner nozzle are
It is made of an insulating resin material that can be evaporated by an arc generated between the fixed-side arc contact and the movable-side arc contact when current is interrupted.

Further, a closed vessel filled with an arc-extinguishing gas, a fixed contact insulated and supported in the closed vessel and arranged coaxially with a circuit breaker drive shaft, and a fixed contact inside the fixed contact. A fixed-side arc contact provided coaxially with the armature, a piston provided insulated and supported in the closed container, and a piston fitted to the piston and arranged coaxially with the circuit breaker drive shaft. A puffer cylinder forming a puffer chamber together with the piston, and coaxial with the circuit breaker drive shaft, and opposed to the fixed contact, and arranged in the closed container so as to be able to come and go. A movable contact, a movable-side arc contact provided inside the movable contact coaxially with the movable contact so as to face the fixed-side arc contact, and the fixed contact from a tip end of the puffer cylinder. On the child side A gas flow path for blowing the arc-extinguishing gas in the puffer chamber to an arc generated between the fixed-side arc contact and the movable-side arc contact when current is interrupted. A gas flow path, wherein the gas flow path is formed so that a flow path central axis is substantially perpendicular to the circuit breaker drive axis, and the gas flow path is fixed when current is interrupted. An outlet channel having an outlet opening into an arc generating space between the side arc contact and the movable side arc contact, and a channel center axis is formed so as to be substantially parallel to the circuit breaker drive axis, It comprises a main flow path communicating the puffer chamber and the blow-out flow path, and the blow-out flow path is configured such that the length of the flow path central axis is at least twice the width of the blow-out port. It is those who are.

The connecting portion between the main flow passage and the blow-out flow passage is provided so that the arc-extinguishing gas flowing in the main flow passage substantially in parallel with the circuit breaker drive shaft is temporarily radiated outward at the connecting portion. After being flowed, it is formed so as to be folded back by approximately 90 degrees and flow into the blow-out channel.

The outlet channel is formed in a reduced and enlarged structure in which a channel area perpendicular to the central axis of the channel is once reduced radially inward and then expanded.

In the blowout channel, the rate of increase in the area of the flow channel orthogonal to the center axis of the flow channel in the enlarged portion of the reduced and enlarged structure is large on the side of the extremely small portion of the reduced and enlarged structure, and on the side of the outlet. It is formed to be smaller.

[0012] Further, the blow-out flow path is formed such that an extremely small portion of the reduction / enlargement structure has a predetermined length in a radial direction.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 FIG. 1 and 2 are a cross-sectional view and an enlarged cross-sectional view, respectively, showing a gas blowing portion of a puffer type gas circuit breaker according to Embodiment 1 of the present invention. In the figure, the same or corresponding parts as those of the conventional puffer type gas circuit breaker shown in FIG. 16 are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 1 and FIG.
And the puffer cylinder 4 are coaxially arranged, the movable-side arc contact 7 is attached to the tip of the operating rod 27, and the puffer cylinder 4, the movable contact 6 and the movable-side arc contact 7 are driven by a driving device (not shown). , And are integrally driven via the operation rod 27. Further, an insulating nozzle 15 extends from the tip end surface of the puffer cylinder 4 to the fixed contact 1 side, and the inner nozzle 16 extends from the tip end outer peripheral portion of the movable arc contact 7 to the fixed arc contact 2.
It extends to the side. The insulating nozzle 15 and the inner nozzle 16 are formed in a cylindrical shape so as to surround the fixed-side arc contact 2. Further, a gas flow path 17 is formed by the insulating nozzle 15 and the inner nozzle 16. The gas flow path 17 is formed so as to communicate the arc generating space between the fixed-side arc contact 2 and the movable-side arc contact 7 and the puffer chamber 5 during the opening operation (current interruption), A cylindrical main flow path 18 formed substantially coaxially with the circuit breaker drive shaft A
And a ring-shaped blowing flow path 19 which is provided in series with the main flow path 18 and is formed so that the flow path center axis B is substantially perpendicular to the circuit breaker drive axis A. In addition, spray channel 1
9 is formed such that its height H is twice as large as the width D of the blowing port 20. Here, the height H of the blowing channel 19 and the width D of the blowing port 20 are respectively the length of the channel center axis B of the blowing channel 19 and the blowing port 20 in a direction parallel to the circuit breaker drive axis A. Opening length. Further, the insulating nozzle 15 and the inner nozzle 16
The insulating resin evaporated by the heat energy of the arc 14, for example, Teflon (trade name of Du Pont) or a material containing a filler mainly composed of Teflon is used. The other configuration is the same as that of the conventional puffer type gas circuit breaker.

Next, the arc extinguishing operation of the arc 14 in the puffer type gas circuit breaker thus configured will be described. When there is an opening command, the movable contact 6 and the movable-side arc contact 7 are driven by a driving device (not shown),
Move away from the fixed contact 1 and the fixed-side arc contact 2.
At this time, the fixed-side arc contact 2 and the movable-side arc contact 7
An arc 14 is generated between them. And the movable contact 6
The arc-extinguishing gas in the puffer chamber 5 is compressed by the opening operation of the movable-side arc contact 7, and the compressed arc-extinguishing gas is cut off from the puffer chamber 5 through the main flow path 18 of the gas flow path 17. After flowing substantially parallel to the heater drive shaft A, the arc 14 is blown from the blowing port 20 to the arc 14 through the blowing channel 19. Thereby, the acceleration of the flow of the arc 14 in the portion where the arc-extinguishing gas is blown is increased, the cooling thereof is promoted, and the arc 14 is extinguished.

As described above, according to the first embodiment,
The gas flow path 17 includes a main flow path 18 having a flow path central axis formed substantially parallel to the circuit breaker drive axis A, and a main flow path 18 connected thereto, and a flow path central axis B substantially equal to the circuit breaker drive axis A. The flow path 19 is formed so as to be orthogonal to the annular blowing flow path 19, and the height H of the blowing flow path 19 is twice as large as the width D of the blowing port 20. Then, the arc-extinguishing gas flows from the puffer chamber 5 through the main flow path 18 in a direction substantially parallel to the circuit breaker drive shaft A, and is then bent by approximately 90 degrees and then flows through the blowing flow path 19 to the arc 14 from the blowing port 20. Sprayed. Thereby, the angle at which the arc-extinguishing gas is blown to the arc 14 (the angle between the flow direction of the arc 14 and the flow direction of the arc-extinguishing gas at the collision portion between the arc-extinguishing gas and the arc 14) becomes about 80 degrees, Since the arc-extinguishing gas is blown to a narrow area of the arc 14 and the arc-extinguishing gas is blown to the arc 14 without being diffused,
A high-pressure portion is generated in the arc 14, and the acceleration of the flow velocity is increased inside the arc. As a result, the arc 14 is cooled from the core, and the thermal insulation performance is improved. Further, since the blowing channel 19 is formed in a ring shape, the arc-extinguishing gas is blown from the entire circumference in the circumferential direction to the arc 14, and the arc 1 is discharged.
4 can be effectively extinguished. Further, since the gas flow path 17 is composed of the main flow path 18 substantially parallel to the circuit breaker drive shaft A and the blowing flow path 19 orthogonal to the main flow path 18, the flow resistance of the gas flow path 18 is large. Thus, excessive outflow of the arc-extinguishing gas from the puffer chamber 5 is suppressed.
As a result, the arc-extinguishing gas can be blown to the arc 14 for a long time, and re-ignition can be reliably prevented. Furthermore, since the insulating nozzle 15 and the inner nozzle 16 are made of Teflon or an insulating resin material containing Teflon as a main component, the heat energy of the arc 14 causes the insulating nozzle 15 and the inner nozzle 16 to be formed.
Is evaporated. As a result, the energy of the arc 14 is consumed by the evaporation of the insulating nozzle 15 and the inner nozzle 16 to reduce the energy of the arc itself. Can be raised to improve the breaking performance.

FIG. 3 shows the result of simulation analysis of the spray angle when the ratio (H / D) of the height H of the spray channel 19 to the width D of the spray port 20 is changed. From FIG. 3, the height H of the spray channel 19 is
When the ratio (H / D) between the ratio and the width D of the blowing port 20 increases, the blowing angle increases, and the ratio (H / D) becomes about 1.
3, the blowing angle takes a maximum value (approximately 85 degrees), and when the ratio (H / D) exceeds 1.3, the blowing angle gradually decreases, and when the ratio (H / D) becomes twice or more, It can be seen that the spray angle is stabilized at about 80 degrees. When the ratio (H / D) is less than 2, it can be seen that a slight shift in the ratio (H / D) causes a large variation in the spray angle. Therefore, it is desirable to set the ratio (H / D) to 2 or more in consideration of the variation of the ratio (H / D) caused by the dimensional tolerance and the assembly tolerance of the insulating nozzle 15 and the inner nozzle 16. That is, by setting the ratio (H / D) to 2 or more, a puffer type gas circuit breaker having a spray angle of 80 degrees can be stably manufactured.

Embodiment 2 FIG. 4 and 5 are a cross-sectional view and an enlarged cross-sectional view, respectively, showing a gas blowing portion of a puffer type gas circuit breaker according to Embodiment 2 of the present invention. 4 and 5, an insulating nozzle 15A extends from the tip end surface of the puffer cylinder 4 to the fixed contact 1 side. The insulating nozzle 15A is formed in a cylindrical shape so as to surround the fixed-side arc contact 2. And
A gas flow path 17A is formed by the insulating nozzle 15A and the movable-side arc contact 7. This gas flow path 17A
The arc generating space between the fixed-side arc contact 2 and the movable-side arc contact 7 and the puffer chamber 5 are formed so as to communicate with each other during the opening operation (when current is interrupted). A cylindrical main flow path 18A formed coaxially;
8A, and is formed of a ring-shaped blowing flow path 19A formed so that the flow path central axis B is substantially orthogonal to the circuit breaker driving axis A. The blowing channel 19A is formed such that the height H is twice as large as the width D of the blowing port 20A. The other configuration is the same as that of the first embodiment.

Next, the arc extinguishing operation of the arc 14 in the puffer type gas circuit breaker thus configured will be described. When there is an opening command, the movable contact 6 and the movable-side arc contact 7 are driven by a driving device (not shown),
Move away from the fixed contact 1 and the fixed-side arc contact 2.
At this time, the fixed-side arc contact 2 and the movable-side arc contact 7
An arc 14 is generated between them. And the movable contact 6
The arc-extinguishing gas in the puffer chamber 5 is compressed by the opening operation of the movable-side arc contact 7, and the compressed arc-extinguishing gas is cut off from the puffer chamber 5 through the main flow path 18A of the gas flow path 17A. After flowing substantially parallel to the heater drive axis A, the arc 14 is blown from the blowing port 20A to the arc 14 through the blowing channel 19A. Thereby, the acceleration of the flow of the arc 14 in the portion where the arc-extinguishing gas is blown is increased, the cooling thereof is promoted, and the arc 14 is extinguished.

As described above, also in the second embodiment, the gas flow path 17A is connected to the main flow path 18A having the flow path central axis formed substantially parallel to the circuit breaker drive axis A, and to the main flow path 18A. Further, a ring-shaped blowing flow path 19A formed so that the flow path center axis B is substantially orthogonal to the circuit breaker driving axis A, and the height H of the blowing flow path 19A is
It is formed to be twice as large as the width D of 0A.
Therefore, the angle at which the arc-extinguishing gas is blown to the arc 14 is about 80 degrees, and the arc-extinguishing gas is blown to a narrow range of the arc 14 and the arc-extinguishing gas is blown to the arc 14 without being diffused. A high-pressure portion is generated in the arc 14, and the acceleration of the flow velocity is increased inside the arc. As a result, the arc 14 is cooled from the core, and the thermal insulation performance is improved. Further, since the blowing channel 19A is formed in a ring shape, the arc-extinguishing gas is blown from the entire circumference of the arc 14 in the circumferential direction, so that the arc 14 can be effectively extinguished. Further, since the gas flow path 17A is composed of the main flow path 18A substantially parallel to the circuit breaker drive shaft A and the blowing flow path 19A orthogonal to the main flow path 18A, the flow resistance of the gas flow path 18 is large. Thus, excessive outflow of the arc-extinguishing gas from the puffer chamber 5 is suppressed. As a result, the arc-extinguishing gas can be blown to the arc 14 for a long time, and re-ignition can be reliably prevented.

Embodiment 3 FIG. 6 is a sectional view showing a gas blowing portion of a puffer type gas circuit breaker according to Embodiment 3 of the present invention. 6, an insulating nozzle 15B extends from the tip end face of the puffer cylinder 4 to the fixed contact 1 side, and an inner nozzle 16B extends from the tip outer peripheral portion of the movable arc contact 7 to the fixed side arc contact 2 side. Has been established. These insulating nozzle 15B and inner nozzle 16B
Is formed in a cylindrical shape so as to surround the fixed arc contact 2. Then, the insulating nozzle 15B and the inner nozzle 16
B forms a gas flow path 17B. The gas flow path 17B is formed so as to communicate the arc generating space between the fixed-side arc contact 2 and the movable-side arc contact 7 with the puffer chamber 5 during the opening operation (current interruption), A cylindrical main flow path 18B formed substantially coaxially with the breaker drive shaft A
An annular blowing flow path 19B formed so that the flow path center axis B is substantially perpendicular to the circuit breaker driving axis A; and a main flow path 18B.
And a connecting flow path 21 as a connecting part for connecting the blowing path 19 </ b> B. In addition, the connection flow path 21
Is formed so that the arc-extinguishing gas flowing in the main flow path 18B, which flows substantially parallel to the circuit breaker drive shaft A, flows outward once in the radial direction, and then turns back approximately 90 degrees and flows into the blow-out flow path 19B. That is, the height R2 of the flow path in the connecting flow path 21 from the circuit breaker drive shaft A is the height R of the main flow path 18B at the outlet of the arc-extinguishing gas from the puffer chamber 5 from the circuit breaker drive axis A.
It is formed higher than 1. Here, the spray channel 19
B has a height H of 2 with respect to the width D of the spray port 20B.
It is formed so as to be doubled. In addition, the insulating nozzle 15
B and the inner nozzle 16B are provided with an insulating resin, for example, Teflon (Du
A material containing a filler mainly composed of Teflon or Teflon is used. The other configuration is the same as that of the first embodiment.

Next, the arc extinguishing operation of the arc 14 in the puffer type gas circuit breaker thus configured will be described. When there is an opening command, the movable contact 6 and the movable-side arc contact 7 are driven by a driving device (not shown),
Move away from the fixed contact 1 and the fixed-side arc contact 2.
At this time, the fixed-side arc contact 2 and the movable-side arc contact 7
An arc 14 is generated between them. And the movable contact 6
The arc-extinguishing gas in the puffer chamber 5 is compressed by the opening operation of the movable-side arc contact 7, and the compressed arc-extinguishing gas is cut off from the puffer chamber 5 through the main flow path 18B of the gas flow path 17B. Flows in a direction substantially parallel to the drive shaft A, and then flows radially outward through the connection flow path 21, is then bent approximately 90 degrees, flows into the blowing flow path 19 </ b> B, and flows into the blowing flow path 1 </ b> B.
The arc 14 is sprayed from the spray port 20B through the arc 9B.

According to the third embodiment, the connection flow path 21
Is formed higher than the height R1 of the main flow path 18B at the outlet of the arc-extinguishing gas from the puffer chamber 5 from the circuit breaker drive shaft A at the outlet of the arc extinguishing gas. The arc-extinguishing gas flowing in the main flow path 18B substantially parallel to the heater drive shaft A is once flowed radially outward in the connection flow path 21 and then turned back at approximately 90 degrees to blow out the flow path 1
Flow into 9B. As a result, compared to the first embodiment, the arc extinguishing gas is concentrated without diffusing
, The arc 14 can be cooled from the arc core, and the breaking performance can be further improved.

In the third embodiment, in the puffer-type gas circuit breaker according to the first embodiment, the arc-extinguishing gas flowing through the main flow passage in a direction substantially parallel to the circuit breaker drive shaft A is once caused to flow radially outward. After that, the connecting flow path is formed so as to be turned around by about 90 degrees and flow into the blow-out flow path. However, in the puffer type gas circuit breaker according to the second embodiment, the gas flow through the main flow path substantially parallel to the breaker drive shaft A is provided. The same effect can be obtained by forming the connection flow path such that the arc gas is once flowed radially outward and then turned back by approximately 90 degrees to flow into the blow flow path.

Embodiment 4 FIG. 7 is a sectional view showing a gas blowing portion of a puffer type gas circuit breaker according to Embodiment 4 of the present invention. In FIG. 7, an insulating nozzle 15C extends from the tip end surface of the puffer cylinder 4 to the fixed contact 1 side, and an inner nozzle 16C extends from the tip outer peripheral portion of the movable arc contact 7 to the fixed arc contact 2 side. Has been established. These insulating nozzle 15C and inner nozzle 16C
Is formed in a cylindrical shape so as to surround the fixed arc contact 2. Then, the insulating nozzle 15C and the inner nozzle 16
C forms a gas flow path 17C. The gas flow path 17C is formed so as to communicate the arc generating space between the fixed-side arc contact 2 and the movable-side arc contact 7 with the puffer chamber 5 during the opening operation (at the time of current interruption). A cylindrical main flow path 18C formed substantially coaxially with the breaker drive shaft A
And a ring-shaped blowing flow path 19C formed so as to be continuous with the main flow path 18C and formed so that the flow path center axis B is substantially orthogonal to the circuit breaker drive axis A. In addition, spray channel 1
9C has a flow path area orthogonal to the flow path central axis B, and the main flow path 1
It is formed in a reduced / expanded structure that gradually decreases from a connection portion with 8C and gradually expands after passing through a minimum value. Here, the blowing channel 19C is formed such that its height H is twice as large as the width D of the blowing port 20C. In addition, arc 14 is applied to insulating nozzle 15C and inner nozzle 16C.
For example, a material containing an insulating resin evaporated by the heat energy such as Teflon (trade name of Du Pont) or a filler containing Teflon as a main component is used. The other configuration is the same as that of the first embodiment.

In the puffer type gas circuit breaker thus configured, the arc-extinguishing gas in the puffer chamber 5 is compressed by the opening operation of the movable contact 6 and the movable-side arc contact 7, and the compressed extinguishing gas is cut off. The arc-like gas flows from the puffer chamber 5 through the main flow path 18C of the gas flow path 17C in a direction substantially parallel to the circuit breaker drive shaft A, then flows into the blowing flow path 19C, passes through the blowing flow path 19C, and flows from the blowing port 20C into the arc. 14
Sprayed on.

According to the fourth embodiment, since the blowing flow path 19C is formed in a reduced and enlarged structure, the flow path of the arc-extinguishing gas is narrowed by the minimum portion of the reduction and expansion structure, and the upstream side of the minimum portion is formed. Is higher than the pressure of the arc-extinguishing gas downstream of the minimum part. As a result, the flow rate of the arc-extinguishing gas downstream of the minimum portion becomes greater than the sound speed, the pressure at which the arc-extinguishing gas is blown onto the arc 14 is increased, and the arc extinguishing performance is further improved.

In the fourth embodiment, the puffer type gas circuit breaker according to the second embodiment is different from the puffer type gas circuit breaker according to the first embodiment. In this case, the same effect can be obtained even if the blowing channel is formed in a reduced and enlarged structure.

Embodiment 5 FIG. 8 is a sectional view showing a gas blowing portion of a puffer type gas circuit breaker according to Embodiment 5 of the present invention. In FIG. 8, an insulating nozzle 15D extends from the distal end face of the puffer cylinder 4 to the fixed contact 1 side, and an inner nozzle 16D extends from the distal end outer peripheral portion of the movable arc contact 7 to the fixed arc contact 2 side. Has been established. These insulating nozzle 15D and inner nozzle 16D
Is formed in a cylindrical shape so as to surround the fixed arc contact 2. Then, the insulating nozzle 15D and the inner nozzle 16
D forms a gas flow path 17D. The gas flow path 17D is formed so as to communicate the arc generating space between the fixed-side arc contact 2 and the movable-side arc contact 7 with the puffer chamber 5 at the time of opening operation (current interruption). A cylindrical main flow path 18D formed substantially coaxially with the breaker drive shaft A
And a ring-shaped blowing flow path 19D which is connected to the main flow path 18D and is formed so that the flow path central axis B is substantially perpendicular to the circuit breaker drive axis A. In addition, spray channel 1
9D has a flow path area orthogonal to the flow path central axis B, and the main flow path 1
It is formed in a reduced / expanded structure that gradually decreases from a connection portion with 8D and gradually expands after passing through a minimum value. The rate of increase in the radial direction of the flow path area orthogonal to the flow path central axis B in the enlarged portion of the reduction / expansion structure is large on the side of the minimal portion and small on the side of the outlet 20D. That is, the cross-sectional shape of a plane including the circuit breaker drive shaft A of the enlarged portion of the reduction / expansion structure of the blowing flow path 19D is formed in a bowl shape. Here, the blowing channel 19D is formed so that the height H thereof is twice as large as the width D of the blowing port 20D. The insulating nozzle 15D and the inner nozzle 16D are made of an insulating resin evaporated by the heat energy of the arc 14, for example, a material including Teflon (trade name of Du Pont) or a filler containing Teflon as a main component. ing. The other configuration is the same as that of the first embodiment.

In the puffer-type gas circuit breaker thus configured, the arc-extinguishing gas in the puffer chamber 5 is compressed by the opening operation of the movable contact 6 and the movable-side arc contact 7, and the compressed extinguishing gas is cut off. The arc-like gas flows from the puffer chamber 5 through the main flow path 18D of the gas flow path 17D substantially parallel to the circuit breaker drive shaft A, then flows into the blowing flow path 19D, passes through the blowing flow path 19D, and flows from the blowing port 20D into the arc. 14
Sprayed on.

According to the fifth embodiment, since the blowing flow path 19D is formed in a reduced and enlarged structure, the flow path of the arc-extinguishing gas is narrowed by the minimum portion of the reduction and expansion structure, and the upstream side of the minimum portion is formed. Is higher than the pressure of the arc-extinguishing gas downstream of the minimum part. As a result, the flow rate of the arc-extinguishing gas downstream of the minimum portion becomes greater than the sound speed, the pressure at which the arc-extinguishing gas is blown onto the arc 14 is increased, and the arc extinguishing performance is further improved. Furthermore, since the rate of increase in the radial direction of the flow path area orthogonal to the flow path central axis B in the enlarged portion of the reduction / enlargement structure is formed so as to be large at the minimum portion side and small at the outlet 20D side, the minimum portion The flow rate of the arc-extinguishing gas that has flowed into the enlarged portion through the minimal portion is increased, because the flow rate of the flow path area increases from the portion to the enlarged portion. Thereby, the flow rate of the arc-extinguishing gas blown to the arc 14 is increased, and the arc-extinguishing performance is further improved.

In the fifth embodiment, in the puffer-type gas circuit breaker according to the first embodiment, the blowing flow path is formed in a reduced and enlarged structure, and the rate of increase of the flow path area in the enlarged portion in the radial direction is increased. Is formed so as to be large on the minimum part side and small on the outlet side. However, in the puffer type gas circuit breaker according to the second embodiment, the blowing flow path is formed in a reduced and enlarged structure, and The same effect can be obtained by forming the flow path area in such a manner that the rate of increase in the diameter direction in the radial direction is large on the side of the minimum portion and small on the side of the outlet.

Embodiment 6 FIG. FIG. 9 is a sectional view showing a gas blowing portion of a puffer type gas circuit breaker according to Embodiment 6 of the present invention. In FIG. 9, an insulating nozzle 15E extends from the distal end surface of the puffer cylinder 4 to the fixed contact 1 side, and an inner nozzle 16E extends from the distal end outer peripheral portion of the movable arc contact 7 to the fixed arc contact 2 side. Has been established. These insulating nozzle 15E and inner nozzle 16E
Is formed in a cylindrical shape so as to surround the fixed arc contact 2. Then, the insulating nozzle 15E and the inner nozzle 16
E forms a gas flow path 17E. The gas flow path 17E is formed so as to communicate the arc generating space between the fixed-side arc contact 2 and the movable-side arc contact 7 with the puffer chamber 5 during the opening operation (current interruption). A cylindrical main flow path 18E formed substantially coaxially with the circuit breaker drive shaft A
And a ring-shaped blowing flow path 19E which is connected to the main flow path 18E and whose flow path center axis B is formed so as to be substantially orthogonal to the circuit breaker drive axis A. In addition, spray channel 1
9E shows that the flow path area orthogonal to the flow path center axis B is the main flow path 1
It is formed in a reduced / expanded structure which gradually decreases from the connection portion with 8E and gradually expands after passing through the minimum value 22. And
A cross-sectional shape in a plane including the circuit breaker drive shaft A of the enlarged portion of the reduced and enlarged structure is formed in a bowl shape, and the rate of increase in the radial direction of the flow path area orthogonal to the flow path central axis B in the enlarged portion is minimized. Side, and smaller at the outlet 20E side. Further, the minimal portion 22 is formed to have a predetermined length in the radial direction. That is, the opposing wall surfaces forming the minimal portion 22 are formed so as to have a length in the radial direction parallel to each other. Here, the blowing channel 19E is formed so that the height H thereof is twice as large as the width D of the blowing port 20E. The insulating nozzle 15E and the inner nozzle 16E are made of an insulating resin that is evaporated by the heat energy of the arc 14, for example, a material containing Teflon (trade name of Eu Pont) or a filler containing Teflon as a main component. ing. The other configuration is the same as that of the first embodiment.

In the puffer type gas circuit breaker thus configured, the arc-extinguishing gas in the puffer chamber 5 is compressed by the opening operation of the movable contact 6 and the movable-side arc contact 7, and the compressed extinguishing gas is released. The arc-like gas flows from the puffer chamber 5 through the main flow path 18E of the gas flow path 17E in a direction substantially parallel to the circuit breaker drive shaft A, then flows into the blowing flow path 19E, and is narrowed down by the reduction portion 22 of the blowing flow path 19E. Later, spray port 2
It is blown to the arc 14 from 0E.

According to the sixth embodiment, since the blowing flow path 19E is formed in a reduced and enlarged structure, the flow path of the arc-extinguishing gas is narrowed by the minimum portion 22 of the reduction and expansion structure. The pressure of the arc-extinguishing gas on the upstream side becomes higher than the pressure of the arc-extinguishing gas on the downstream side of the minimum portion. As a result, the flow rate of the arc-extinguishing gas downstream of the minimal portion 22 becomes greater than the speed of sound, the pressure at which the arc-extinguishing gas is blown onto the arc 14 is increased, and arc extinguishing performance is further improved. Since the minimum portion 22 has a length in the radial direction, the pressure difference between the arc-extinguishing gas on the upstream side and the downstream side of the minimum portion 22 is increased. As a result, even when the driving force is reduced, a sufficient flow rate of the arc-extinguishing gas is ensured on the downstream side of the minimum portion 22, and the shutoff performance can be improved. Furthermore, since the rate of increase in the radial direction of the flow path area orthogonal to the flow path central axis B in the enlarged portion of the reduced / expanded structure is formed so as to be large at the minimum portion side and small at the outlet 20E side, the minimum portion portion is formed. The flow rate of the arc-extinguishing gas that has flowed into the enlarged portion through the minimal portion is increased, because the flow rate of the flow path area increases from the portion to the enlarged portion. Thereby, the flow rate of the arc-extinguishing gas blown to the arc 14 is increased, and the arc-extinguishing performance is further improved.

In the sixth embodiment, in the puffer-type gas circuit breaker according to the first embodiment, the blowing flow path is formed in a reduced and enlarged structure, and the rate of increase of the flow path area in the enlarged portion in the radial direction is increased. Is formed so as to be large on the side of the minimal portion and small on the side of the outlet, and further formed so that the minimal portion has a length in the radial direction. In the puffer type gas circuit breaker according to the second embodiment, The blowing channel is formed in a reduced and enlarged structure, and the rate of increase of the channel area in the enlarged portion in the radial direction is large at the minimum portion side and small at the outlet side, and further, the minimum portion is radially increased. The same effect can be obtained even if it is formed to have a length.

Embodiment 7 10 is a cross-sectional view showing a gas blowing portion of a puffer type gas circuit breaker according to Embodiment 7 of the present invention, FIG. 11 is a cross-sectional view taken along the line XI-XI of FIG. 10, and FIG. FIG. 10 to 12, the gas flow path is a tubular main flow path 18 having a flow path center axis substantially parallel to the circuit breaker drive axis A.
and a tubular blowing flow passage 19 connected to the main flow passage 18a and having a flow passage center axis substantially orthogonal to the circuit breaker drive shaft A.
A plurality of L-shaped tubular gas sub-flow paths composed of a and a are arranged around the circuit breaker drive axis A at an equiangular pitch. In addition,
Other configurations are the same as those in the first embodiment.

In the seventh embodiment, the arc-extinguishing gas in the puffer chamber 5 passes through each main flow path 18a, and the circuit breaker drive shaft A
And then the flow direction is deflected and blown to the arc through each blow channel 19a. Since the flow axis of each blowing flow path 19a is substantially perpendicular to the circuit breaker driving axis A, the blowing angle of the arc-extinguishing gas passing through each blowing flow path 19a with respect to the arc becomes about 80 degrees. The arc gas is sprayed on a narrow area of the arc without diffusion. Further, since the plurality of L-shaped tubular gas sub-flow paths are arranged at a constant angular pitch around the circuit breaker drive axis A, the arc-extinguishing gas is sprayed from the position of the circumferential equiangular pitch with respect to the arc. Can be Thereby, the acceleration of the flow of the arc in the portion where the arc-extinguishing gas is blown is increased, the cooling thereof is promoted, and the arc is extinguished. Therefore, also in the seventh embodiment, the same effect as in the first embodiment can be obtained.

Embodiment 8 FIG. 13 is a cross-sectional view showing a gas blowing portion of a puffer-type gas circuit breaker according to Embodiment 8 of the present invention, FIG. 14 is a cross-sectional view taken along the line XIV-XIV in FIG. 13, and FIG. 15 is an XV-XV arrow in FIG. FIG.
13 to 15, the gas flow path has a flow path central axis substantially parallel to the circuit breaker drive axis A, and a plurality of tubular main flow paths 18a arranged at an equiangular pitch around the circuit breaker drive axis A. And a ring-shaped blowing passage 19b having a passage center axis substantially orthogonal to the circuit breaker drive shaft A and connected to these main passages 18a. The other configuration is the same as that of the first embodiment.

In the eighth embodiment, the arc-extinguishing gas in the puffer chamber 5 passes through each main flow path 18a, and the circuit breaker drive shaft A
After that, the flow direction is bent, and the arcs are collectively blown to the arc from one circumference through one blowing flow channel 19b. And the spray channel 19b
Since the center axis of the flow path is substantially orthogonal to the circuit breaker drive axis A,
The angle at which the arc-extinguishing gas passes through the blowing passage 19b with respect to the arc is about 80 degrees, and the arc-extinguishing gas is blown over a narrow range of the arc without diffusion. Thereby, the acceleration of the flow of the arc in the portion where the arc-extinguishing gas is blown is increased, the cooling thereof is promoted, and the arc is extinguished. Therefore, also in the eighth embodiment, the same effect as in the first embodiment can be obtained.

In the seventh embodiment, the main flow path 18
Although the main flow path a and the blowing flow path 19a are formed in a flow path shape having a rectangular cross section, the main flow path 18a and the blowing flow path 19a may be formed in a flow path shape having a substantially circular cross section. In this case, the main flow path 18a and the blowing flow path 19
Processing of the flow path a becomes easy. Embodiment 8
In the embodiment, the main flow path 18a is formed in a flow path shape having a rectangular cross section. However, the main flow path 18a may be formed in a flow path shape having a substantially circular cross section. In this case, the processing of the flow path of the main flow path 18a becomes easy. Further, the seventh and eighth embodiments are described.
Has been described as a modification of the gas flow path structure of the puffer-type circuit breaker in the first embodiment, but it goes without saying that the invention can be applied to the puffer-type gas circuit breaker in the second to sixth embodiments. It is.

[0042]

Since the present invention is configured as described above, it has the following effects.

According to the present invention, the closed container filled with the arc-extinguishing gas, the fixed contact insulated in the closed container and arranged coaxially with the circuit breaker drive shaft, and the fixed contact A fixed-side arc contact provided coaxially and integrally with the fixed contact inside, a piston disposed insulated and supported in the closed container, and the circuit breaker drive shaft fitted to the piston. A puffer cylinder, which is arranged coaxially with the piston and constitutes a puffer chamber together with the piston, coaxially with the circuit breaker drive shaft, and is opposed to the fixed contact, and is detachably movable in the closed container. A movable contact provided inside the movable contact, a movable arc contact provided coaxially with the movable contact inside the movable contact so as to face the fixed arc contact, and a tip end of the puffer cylinder. From above An insulating nozzle extending to the contact side, and extending from the outer peripheral portion of the distal end of the movable arc contact to the fixed side arc contact side inside the insulating nozzle, and at the time of current interruption, the inside of the puffer chamber. A puffer-type gas circuit breaker having an inner nozzle that forms a gas flow path for blowing the arc-extinguishing gas to an arc generated between the fixed-side arc contact and the movable-side arc contact together with the insulating nozzle. In the gas flow path, the flow path center axis is formed so as to be substantially perpendicular to the circuit breaker drive axis, and between the fixed side arc contact and the movable side arc contact at the time of current interruption. An outlet channel having an outlet opening into the arc generating space, and a channel center axis is formed so as to be substantially parallel to the circuit breaker drive shaft, and communicates the puffer chamber with the outlet channel. The outlet channel is configured so that the length of the center axis of the outlet channel is at least twice as large as the width of the outlet. Is generated and the acceleration of the flow of the arc is increased, whereby the cooling thereof is promoted, and a puffer type gas circuit breaker capable of improving the breaking performance can be obtained.

The insulating nozzle and the inner nozzle are
Since it is made of an insulating resin material that can evaporate by an arc generated between the fixed-side arc contact and the movable-side arc contact at the time of current interruption, the energy of the arc is used to evaporate the insulating nozzle and the inner nozzle. The consumed energy reduces the energy of the arc itself, and further increases the pressure in the puffer chamber by the vaporized insulating nozzle and the vapor of the inner nozzle, thereby improving the breaking performance.

Further, a closed container filled with an arc-extinguishing gas, a fixed contact insulated and supported in the closed container and arranged coaxially with the drive shaft of the circuit breaker, and a fixed contact inside the fixed contact A fixed-side arc contact provided coaxially with the armature, a piston provided insulated and supported in the closed container, and a piston fitted to the piston and arranged coaxially with the circuit breaker drive shaft. A puffer cylinder forming a puffer chamber together with the piston, and coaxial with the circuit breaker drive shaft, and opposed to the fixed contact, and arranged in the closed container so as to be able to come and go. A movable contact, a movable-side arc contact provided inside the movable contact coaxially with the movable contact so as to face the fixed-side arc contact, and the fixed contact from a tip end of the puffer cylinder. On the child side A gas flow path for blowing the arc-extinguishing gas in the puffer chamber to an arc generated between the fixed-side arc contact and the movable-side arc contact when current is interrupted. A gas flow path, wherein the gas flow path is formed so that a flow path central axis is substantially perpendicular to the circuit breaker drive axis, and the gas flow path is fixed when current is interrupted. An outlet channel having an outlet opening into an arc generating space between the side arc contact and the movable side arc contact, and a channel center axis is formed so as to be substantially parallel to the circuit breaker drive axis, It comprises a main flow path communicating the puffer chamber and the blow-out flow path, and the blow-out flow path is configured such that the length of the flow path central axis is at least twice the width of the blow-out port. Because there, to generate a high pressure portion to the arc in a narrow range, by increasing the acceleration of the arc flow, it is possible that the cooling is promoted to give a puffer type gas circuit breaker capable of improving the breaking performance.

Further, the connecting portion between the main flow passage and the blow-out flow passage is provided such that the arc-extinguishing gas flowing substantially parallel to the circuit breaker driving shaft flows radially outward at the connecting portion. After flowing, it is formed so as to be turned approximately 90 degrees and flow into the blow-out channel, so that the arc-extinguishing gas is intensively blown to the arc without being diffused, and the breaking performance is improved.

Further, since the outlet channel is formed in a reduced and enlarged structure in which a channel area orthogonal to the channel center axis is once reduced inward in the radial direction and then expanded, the upstream of the extremely small portion is formed. The pressure difference between the arc-extinguishing gas on the downstream side and the downstream side increases, the flow velocity of the arc-extinguishing gas flowing into the enlarged portion through the minimum portion increases, and the arc extinguishing performance can be improved.

In the blow-out flow path, the rate of increase of the flow path area orthogonal to the flow-path center axis in the enlarged portion of the reduced-expansion structure is large on the side of the very small portion of the reduced-expansion structure, and on the side of the discharge port. Since the arc-extinguishing gas is formed so as to be small, the flow rate of the arc-extinguishing gas flowing into the enlarged portion through the minimal portion is further increased, and the arc-extinguishing performance can be further improved.

Further, the blow-out flow path is formed so that the minimum portion of the reduction / expansion structure has a predetermined length in the radial direction, so that the arc-extinguishing gas between the upstream side and the downstream side of the minimum portion can be formed. Thus, even when the pressure difference becomes large and the driving force is small, sufficient shutoff performance can be secured.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a gas blowing portion of a puffer type gas circuit breaker according to Embodiment 1 of the present invention.

FIG. 2 is an enlarged sectional view showing a gas blowing portion of the puffer type gas circuit breaker according to Embodiment 1 of the present invention.

FIG. 3 is a diagram showing a change in the gas blowing angle when the ratio of the length of the blowing channel to the width of the blowing port in the puffer type gas circuit breaker according to Embodiment 1 of the present invention is changed.

FIG. 4 is a cross-sectional view showing a gas blowing portion of a puffer type gas circuit breaker according to Embodiment 2 of the present invention.

FIG. 5 is an enlarged sectional view showing a gas blowing portion of a puffer type gas circuit breaker according to Embodiment 2 of the present invention.

FIG. 6 is a cross-sectional view showing a gas blowing portion of a puffer type gas circuit breaker according to Embodiment 3 of the present invention.

FIG. 7 is a cross-sectional view showing a gas blowing portion of a puffer type gas circuit breaker according to Embodiment 4 of the present invention.

FIG. 8 is a sectional view showing a gas blowing portion of a puffer type gas circuit breaker according to Embodiment 5 of the present invention.

FIG. 9 is a sectional view showing a gas blowing portion of a puffer type gas circuit breaker according to Embodiment 6 of the present invention.

FIG. 10 is a sectional view showing a gas blowing portion of a puffer type gas circuit breaker according to Embodiment 7 of the present invention.

11 is a sectional view taken along the line XI-XI in FIG. 10;

12 is a sectional view taken along the line XII-XII in FIG.

FIG. 13 is a cross-sectional view showing a gas blowing portion of a puffer type gas circuit breaker according to Embodiment 8 of the present invention.

14 is a sectional view taken along the line XIV-XIV in FIG.

15 is a sectional view taken along the line XV-XV in FIG.

FIG. 16 is a schematic cross-sectional view showing an open and closed state of a conventional puffer type gas circuit breaker.

[Explanation of symbols]

Reference Signs List 1 fixed contact, 2 fixed arc contact, 3 piston, 4 puffer cylinder, 5 puffer chamber, 6 movable contact, 7 movable arc contact, 12 metal tank (closed vessel), 14 arc, 15, 15A , 15B,
15C, 15D, 15E Insulated nozzle, 16, 16B,
16C, 16D, 16E Inner nozzle, 17, 17A, 1
7B, 17C, 17D, 17E Gas flow path, 18, 18
A, 18B, 18C, 18D, 18E Main flow path, 19,
19A, 19B, 19C, 19D, 19E Spray channel, 20, 20A, 20B, 20C, 20D, 20E
Spray port, 21 connecting flow path (connecting part), 22 minimum part, A circuit breaker drive shaft, B flow path central axis.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Yasushi Nakayama 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Hiroki Ito 2-3-2 Marunouchi 3-chome, Chiyoda-ku, Tokyo Rishi Electric Co., Ltd. (72) Inventor Haruhiko Kayama 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Daisuke Yoshida 2-3-2 Marunouchi, Chiyoda-ku, Tokyo (72) Inventor Masaki Hiratsuka 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation F-term (reference) 5G001 AA01 BB01 CC02 DD03 EE09

Claims (7)

[Claims] 1. A closed container filled with an arc-extinguishing gas, a fixed contact insulated in the closed container and arranged coaxially with a circuit breaker drive shaft, and a fixed contact inside the fixed contact. A fixed-side arc contact provided coaxially with the armature, a piston provided insulated and supported in the closed container, and a piston fitted to the piston and arranged coaxially with the circuit breaker drive shaft. A puffer cylinder forming a puffer chamber together with the piston, and coaxial with the circuit breaker drive shaft, and opposed to the fixed contact, and arranged in the closed container so as to be able to come and go. A movable contact, a movable-side arc contact provided inside the movable contact coaxially with the movable contact so as to face the fixed-side arc contact, and the fixed contact from a tip end of the puffer cylinder. Extended to child side The insulating nozzle, which is provided inside the insulating nozzle and extends from the outer peripheral portion on the tip side of the movable arc contact to the fixed arc contact so as to extend the arc-extinguishing gas in the puffer chamber when current is interrupted. A puffer-type gas circuit breaker comprising: an inner nozzle that forms a gas flow path for blowing an arc generated between the fixed-side arc contact and the movable-side arc contact together with the insulating nozzle; Is formed so that the center axis of the flow path is substantially perpendicular to the drive axis of the circuit breaker, and is open to an arc generation space between the fixed-side arc contact and the movable-side arc contact at the time of current interruption. An outlet channel having an outlet to be formed, a channel central axis is formed so as to be substantially parallel to the circuit breaker drive shaft, and comprises a main channel that communicates with the puffer chamber and the outlet channel, The puffer type gas circuit breaker, wherein the outlet channel is configured such that the length of the channel center axis is at least twice the width of the outlet. 2. The insulating nozzle and the inner nozzle are made of an insulating resin material that can be evaporated by an arc generated between the fixed arc contact and the movable arc contact when current is interrupted. The puffer type gas circuit breaker according to claim 1, wherein: 3. A closed vessel filled with an arc-extinguishing gas, a fixed contact insulated in the closed vessel and arranged coaxially with a circuit breaker drive shaft, and a fixed contact inside the fixed contact. A fixed-side arc contact provided coaxially with the armature, a piston provided insulated and supported in the closed container, and a piston fitted to the piston and arranged coaxially with the circuit breaker drive shaft. A puffer cylinder forming a puffer chamber together with the piston, and coaxial with the circuit breaker drive shaft, and opposed to the fixed contact, and arranged in the closed container so as to be able to come and go. A movable contact, a movable-side arc contact provided inside the movable contact coaxially with the movable contact so as to face the fixed-side arc contact, and the fixed contact from a tip end of the puffer cylinder. Extended to child side When the current is cut off, a gas flow path for blowing the arc-extinguishing gas in the puffer chamber to an arc generated between the fixed-side arc contact and the movable-side arc contact is provided together with the movable-side arc contact. In the puffer type gas circuit breaker provided with an insulating nozzle, the gas flow path is formed so that a flow path central axis is substantially perpendicular to the circuit breaker drive axis, and the fixed side at the time of current interruption is provided. An outlet channel having an outlet opening into an arc generating space between the arc contact and the movable-side arc contact, and a channel central axis formed so as to be substantially parallel to the circuit breaker drive axis, A main flow path that communicates the puffer chamber and the blow-out flow path, wherein the blow-out flow path is configured such that the length of the flow path central axis is at least twice the width of the blow-out port. Puffer type gas circuit breaker, characterized in that. 4. A connecting portion between the main flow passage and the blow-out flow passage, wherein the arc-extinguishing gas flowing in the main flow passage substantially in parallel to the circuit breaker drive shaft is once radially outward at the connecting portion. The puffer-type gas circuit breaker according to any one of claims 1 to 3, wherein the puffer-type gas circuit breaker is formed so as to be turned approximately 90 degrees after flowing, and flow into the blow-out channel. 5. The blow-out flow path is formed in a reduced-expansion structure in which a flow path area orthogonal to the flow path central axis is once reduced radially inward and then expanded. The puffer type gas circuit breaker according to any one of claims 1 to 4. 6. An increase rate of an area of a flow path area orthogonal to the flow path central axis in an enlarged portion of the contraction / expansion structure is large on the side of the minimum portion of the reduction / expansion structure, and on the side of the discharge port. The puffer type gas circuit breaker according to claim 5, wherein the gas circuit breaker is formed to be small. 7. The puffer type according to claim 5, wherein the blow-out channel is formed such that a minimum portion of the reduction / enlargement structure has a predetermined length in a radial direction. Gas circuit breaker.