JPH0817306A - Buffer type gas-blast circuit-breaker - Google Patents

Abstract

PURPOSE:To downsize a buffer type gas-blast circuit-breaker and reduce the cost by forming the arc extinguishing chamber of a breaker so that it may be in the condition of axial junction or that it may forms layers in thickness direction of the wall out of a plurality of insulating materials different in material property from each other. CONSTITUTION:For an arc extinguishing chamber, the cylindrical part having a proper thickness from the inwall face of the hole excluding the fan shape is made of a PTFE resin cylinder 20, out of the throat part where a fixed contact goes in and out. Though the inwall face of the hole is subjected to the intense heat irradiation from arc at break of a current, the arc extinguishing chamber can be made downsized by the high arc extinguishing capacity of the PTFE resin cylinder 20 and the high mechanical strength of the insulating material 21 surrounding the PTFE resin cylinder 20, by forming the arc extinguishing chamber this way.

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 used as a large-capacity circuit breaker for electric power, and more particularly, to a container filled with arc-extinguishing gas and a fixed contactor.
A movable contactor that contacts and separates from the movable contactor, a puffer cylinder that interlocks with the movable contactor, a fixed piston that forms a puffer chamber in the puffer cylinder, and a movable piston that surrounds the movable contactor and is compressed in the puffer chamber. The present invention relates to a puffer-type gas circuit breaker including a cylindrical arc extinguishing chamber that guides gas emitted from a puffer chamber blowout hole to an opening gap of the fixed / movable contact.

[0002]

2. Description of the Related Art A puffer type gas circuit breaker compresses an arc extinguishing gas and blows the compressed gas onto a gap of a breaking portion to extinguish an arc, thereby breaking a large current. As an arc extinguishing gas, SF ₆ gas is very excellent in terms of arc extinguishing performance and ease of use, and even ultra-high pressure and large capacity circuit breakers are used.

FIG. 8 is a cross-sectional view showing an example of the essential structure of a conventional puffer type gas circuit breaker, showing the closed state of the circuit breaker. In this configuration example, the fixed contactor 4 is provided in the metal container 1.
And a movable contactor 6 that comes into contact with and separates from the movable contactor 6, a puffer cylinder 7, a fixed piston 8, an insulating nozzle 5 that surrounds the movable contactor 6, an insulating nozzle 5, a movable contactor 6, and a puffer cylinder 7. An insulating rod 11 that is driven to open and close is housed, and SF ₆ gas of several atmospheres is filled as an arc extinguishing gas.

In the state shown in the figure, the current always flows through the conductor 2a, the fixed contact 4, the movable contact 6, the exhaust pipe 9, the slider 13, the fixed piston 8 and the conductor 2b. When the insulating rod 11 is pulled in the direction of arrow X by an opening / closing drive mechanism (not shown) at the time of shutting off, the puffer cylinder 7, the movable contact 6, and the insulating nozzle 5 are integrally driven to the right through the exhaust pipe 9 and fixed. The movable contact 6 is separated from the contact 4, the SF ₆ gas in the puffer chamber 12 is compressed, and the compressed SF ₆ gas is guided to the separation gap between the fixed contact 4 and the movable contact 6. While the fixed contactor 4 passes through the throat portion 5a of the insulating nozzle 5, the arc generated between the fixed contactor 4 and the movable contactor 6 is blown to discharge the ionized gas between the contactors to the exhaust pipe 9 The stationary contactor 4 passes through the throat portion 5a of the insulating nozzle 5, and at the same time, the compressed SF ₆ gas is strongly blown to the arc generated between the fixed and movable contactors, and the current flows. Be cut off. The insulating nozzle 5 is molded using an insulating material into an axisymmetric body having a cross-sectional shape as shown in the figure. The fixed contactor 4 side of the throat portion 5a of the insulating nozzle 5 spreads like a hole, and the gas is extinguished and extinguished. I am trying to increase.

In addition to the structure shown in FIG. 8, the shutoff portion of the puffer type circuit breaker has a fixed contact formed in a hollow shape.
Instead of the insulating nozzle 5, an insulating cylinder having a simple cylindrical shape over the entire length in the axial direction and at least a cylindrical body portion made of an insulating material is used, and the gas compressed in the puffer chamber is guided into the insulating cylinder so that a hollow fixed contactor is provided. There is also a structure in which the current is blown into the insulating cylinder to shut off the current.

[0006]

Conventionally, an arc extinguishing chamber which is formed axisymmetrically by using an insulating material, such as an insulating nozzle which surrounds a separation gap between a fixed and a movable contact, has an insulating structure which constitutes this. Insulating material with high arc extinguishing performance, that is, the molecules of the insulating material that did not form a carbonized layer on the surface due to arc heat and sublimated or pyrolyzed by arc heat to become a gas phase state Only one type of insulating material was used that contributes to extinguishing the arc when entering. On the other hand, as technological development progresses, the arc-extinguishing chamber becomes smaller, the internal space becomes smaller, and if the arc energy released into this internal space at the time of current interruption is constant, the pressure inside the arc-extinguishing chamber rises and Even if the wall thickness of the insulation cylinder is increased to withstand the pressure, the inner wall surface of the insulation cylinder is exposed to arc heat and causes thermal distortion, so the increased strength cannot be obtained. Since the insulating material with high arc performance has a small mechanical strength, there is a limit to the downsizing of the arc-extinguishing chamber, and if the breaking capacity, that is, the arc energy is constant, the cost of the circuit breaker linked to the size of the arc-extinguishing chamber is reduced. There was a problem that there was a problem.

An object of the present invention is to provide an arc-extinguishing chamber structure capable of overcoming the conventional miniaturization of the arc-extinguishing chamber and further downsizing it.

[0008]

In order to solve the above-mentioned problems, in the present invention, a fixed contact, a movable contact for contacting with and separating from the fixed contact, and a movable contact for the movable contact are provided in a container filled with an arc-extinguishing gas. A puffer cylinder that interlocks with the contact, and a fixed piston that forms a puffer chamber in the puffer cylinder,
A puffer-shaped gas shield provided with a cylindrical arc-extinguishing chamber that surrounds the movable contactor and guides the gas compressed in the puffer chamber and discharged from the puffer chamber blow-out hole to the opening gap of the fixed / movable contactor. The arc-extinguishing chamber according to claim 1,
There is provided a circuit breaker configured such that a plurality of insulating materials having different material properties are bonded to each other in the axial direction and / or layered in the thickness direction of the arc-extinguishing chamber wall.

In this case, among the plurality of insulating materials that form the arc extinguishing chamber, the insulating material located within the axial range of the full separation gap between the fixed and movable contacts is in the axial direction. It is extremely suitable to use the PTFE resin in the whole or a part of the range from the wall surface of the arc-extinguishing chamber to an appropriate thickness and the entire length in the circumferential direction. Further, as described in claim 3, the cylindrical arc-extinguishing chamber is integrated with the movable contactor so as to be movable, and the throat portion into and out of which the fixed contactor comes in and out is widened in a funnel shape on the axial outer side of the throat portion. When formed, and at least as a full-opening gap between fixed and movable contacts in the axial direction as an insulating nozzle composed only of insulating material, at least the funnel shape of the throat part where the fixed contact comes in and goes out. It is preferable to use an appropriate thickness of the PTFE resin from the inner peripheral surface of the hole other than the widened portion over the entire length in the circumferential direction.

Further, according to a fourth aspect of the present invention, the conical surface forming the wax-like expansion of the insulating nozzle throat portion forms the hole portion other than the wax-like expansion portion of the throat portion.
PTF formed by connecting to a tubular body made of TFE resin
It is more preferable to form it as the inner wall surface of the hollow conical body made of E resin. Moreover, an arc extinguishing chamber is set forth in claim 3.
In the case of the insulating nozzle described above, as in claim 5, the insulating material in the substantially entire axial range of the throat portion including the brazing portion may be only the PTFE resin.

When the arc extinguishing chamber is the insulating nozzle according to the third aspect, as described in the sixth aspect, from the axially intermediate position of the throat portion excluding the brazing portion to the entire brazing portion side and the rest of the throat portion. It is more preferable that the inner wall surface of the hole in the axial range and the cylindrical portion having an appropriate thickness are made of PTFE resin. In this case, as described in claim 7, the cylindrical portion made of the PTFE resin, which is formed on the side of the warp portion from the axially intermediate position of the throat portion excluding the brazing portion, has a cylindrical outer surface at the end portion on the side of the warp portion. It may be formed in a shape with a flange having an outer diameter larger than the diameter.

When the arc extinguishing chamber is the insulating nozzle according to the third aspect, as in the eighth aspect, the entire inner wall surface of the hole portion excluding the brazing portion and the axial direction of the conical surface of the brazing portion are provided in the throat portion. A tubular body made of PTFE resin having a flat end face on the side of the inner wall of the hole portion from the intermediate position may be embedded as a constituent member of the throat portion.

When the arc extinguishing chamber is the insulating nozzle according to the third aspect, the insulating nozzle has a structure in which the entire inner wall surface of the insulating material portion of the insulating nozzle has an appropriate thickness from the inner wall surface. It is very suitable to have a structure formed of a PTFE resin forming a cylindrical body forming a layer.

[0014]

According to the present invention, the characteristics required for the arc extinguishing chamber when the arc extinguishing chamber is downsized under a certain breaking capacity are the arc extinguishing performance of the insulating material used for the construction of the arc extinguishing chamber. There are two characteristics, mechanical strength, and it is necessary to provide an insulating material having excellent arc extinguishing performance even if the mechanical strength is insufficient and an insulating material having high mechanical strength even if the arc extinguishing performance is insufficient. If any, if the arc extinguishing chamber is configured by appropriately combining these insulating materials and including the insulating material for connecting the insulating materials, it is noted that an arc extinguishing chamber satisfying the two characteristics will be obtained. Although various methods are conceivable for combination, as described in claim 1, a plurality of insulating materials having different material properties are axially joined to each other and / or the meat of the arc-extinguishing chamber wall. If the arc extinguishing chamber is configured by using layers in the thickness direction, the arc extinguishing will be extinguished especially in the axial range where the irradiation intensity of the arc heat is different in the axial direction. An arc-extinguishing chamber is used by using an appropriate amount of high-performance insulation material, and by using an insulation material with high mechanical strength in the remaining part so that arc insulation performance and insulation material are all or partly in the axial direction. Downsized,
Alternatively, when the breaking capacity of the circuit breaker is large and the irradiation intensity on the wall surface of the arc-extinguishing chamber is strong over the entire axial range, insulation with high arc-extinguishing performance is formed so as to form a layer in the thickness direction from the wall surface of the arc-extinguishing chamber over the entire axial range. The arc-extinguishing chamber can be miniaturized by using a material and an insulating material having high mechanical strength on the outside thereof.

When the arc extinguishing gas is SF ₆ gas, a PTFE (polytetrafluoroethylene, trade name of duPont: Teflon) resin is often used as an insulating material having high arc extinguishing performance, and PTFE is also used in the present invention. It is assumed that the resin is one of the high arc extinguishing performance resins used in the construction of the arc extinguishing chamber. The PTFE resin itself has a high melting point of 327 ° C., is excellent in heat resistance and chemical resistance, is not attacked by almost all organic solvents, acids and alkalis, and does not become brittle even at ultralow temperatures. However, the moldability is poor, the molding is performed by the sintering method, and the mechanical strength tends to be lower than that of a general thermosetting casting resin. However, the molded product does not form a carbonized layer on the surface even when it is irradiated with arc heat, and the generated carbide is dispersed in the state of particles inside the surface layer of the molded product, and both the surface and the inside are insulated. Resistance does not decrease. In addition, of the resins that have undergone sublimation or thermal decomposition due to arc heat and become gas phase, the resin that has entered the arc is further vaporized, and the fluorine contained therein is the arc extinguishing gas. There is S
Adds to the fluorine of F ₆ gas and helps the arc extinguishing action.

On the other hand, as one of the resins having higher mechanical strength, for example, B (boron) -containing PTFE resin can be considered. B acts as a binder for the powdery PTFE resin and enhances the mechanical strength of the sintered molded product. However, since B has hygroscopicity, the PTFE resin molded product containing B is pure PTF.
The insulation performance is lower than that of the E resin molded product, and when it is irradiated with arc heat, it releases moisture to reduce the arc extinguishing performance of the circuit breaker. Therefore, by using the B-containing PTFE resin in a part which is not irradiated with arc heat or a part where the irradiation intensity is low, the arc extinguishing chamber has a high arc extinguishing performance and high mechanical strength even though it is small. can do.

As the insulating material having the higher mechanical strength, ceramics made of Al ₂ O ₃ as a raw material can be considered in addition to the resin. Similar to the case of the B-containing PTFE resin, the ceramic is also formed by sintering powder, but the mechanical strength is remarkably higher than that of the B-containing PTFE resin molded product, and particularly Al ₂ O ₃ the one used for the raw material has little attack by the decomposition products of SF ₆ gas, is suitable for use in SF ₆ gas. However, since it has a large specific gravity and is heavy, it is desirable to apply it to a circuit breaker having a structure that does not move the arc-extinguishing chamber when shutting off.

Therefore, among a plurality of insulating materials constituting the arc-extinguishing chamber according to the second aspect, the insulating material positioned in the axial range of the full separation gap between the fixed and movable contacts is axially or completely. If the range of the part is made of PTFE resin over the entire length in the circumferential direction from the arc extinguishing chamber wall surface in the range, PT
By increasing the radial thickness of the FE resin or using a resin with high mechanical strength on the outside of the PTFE resin,
Since the E resin is less likely to be damaged, even if the arc extinguishing chamber is downsized, the arc extinguishing performance and mechanical strength can be high.

When the arc extinguishing chamber is the insulating nozzle according to the third aspect, a proper thickness is provided from the inner peripheral surface of the hole portion other than the funnel-shaped widening portion of the throat portion where the fixed contactor goes in and out. By using PTFE resin over the entire length in the direction, it is possible to obtain an arc extinguishing chamber having high arc extinguishing performance and necessary mechanical strength even if it is small. Further, as described in claim 4, when the throat portion wax and the conical surface are obtained as the inner wall surface of the hollow conical body made of the PTFE resin formed by connecting to the tubular PTFE resin according to claim 3, the throat is formed. Since the entire part is covered with the PTFE resin with an appropriate thickness, the arc extinguishing chamber with higher arc extinguishing performance can be obtained.

According to the fifth aspect of the present invention, the insulating material in the axially substantially entire range of the throat portion including the brazing portion is made of PTFE.
If only the resin is used, the amount of PTFE resin used in the radial direction is increased, the arc extinguishing chamber has high arc extinguishing performance and mechanical strength, and has a long interruption life. Further, according to the sixth aspect, the whole portion of the throat portion from the axially intermediate position of the throat portion excluding the brazing portion to the side of the soldering portion, and the cylindrical portion having an appropriate thickness from the inner wall surface of the hole portion in the axial range remaining in the throat portion are made of PTFE.
When it is made of resin, the cylindrical portion acts to reinforce the resistance to peeling of the brazing portion side PTFE resin from the insulating nozzle body, so that the reliability of use of the arc extinguishing chamber can be increased.

Therefore, when the cylindrical portion is formed in a shape having a flange having an outer diameter larger than the outer diameter of the cylinder at the end portion on the side opposite to the brazing portion, reinforcement of peel strength of the cylindrical portion can be achieved. The strength of the arc-extinguishing chamber is increased and the reliability of use of the arc-extinguishing chamber is further improved. Further, in the insulating nozzle according to claim 3, as in claim 8, in the throat portion, all inner wall surfaces of the hole portion excluding the brazing portion, and all the hole portion side from the axial intermediate position of the conical surface of the brazing portion. Even if a tubular body made of PTFE resin having a flat end surface on the side of the inner wall is embedded as a constituent member of the throat portion, the tubular body does not come out, so that the arc extinguishing is similar to that of claim 3. The effect of performance can be obtained in a state where the use reliability of the insulating nozzle is increased.

When the arc extinguishing chamber is the insulating nozzle according to claim 3, as in claim 9, all the inner wall surfaces of the insulating material portion of the insulating nozzle form a layer from the inner wall surface to an appropriate thickness. When the tubular body is made of PTFE resin, a high-performance arc extinguishing chamber can be formed in a small size even if the breaking capacity of the circuit breaker increases.

[0023]

FIG. 1 shows the first embodiment of the present invention. This embodiment shows an embodiment of the present invention in which the arc-extinguishing chamber has the structure of the insulating nozzle shown in FIG. 7, in which the brazing part is excluded from the throat part where the fixed contactor goes in and out. A cylindrical portion having an appropriate thickness from the inner wall surface of the hole is made of PTFE resin. When the current is cut off, the inner wall surface of the hole receives intense heat from the arc, but by forming the insulating nozzle in this way, the high arc extinguishing performance of the PTFE resin cylinder and PT
The high mechanical strength of the insulating material surrounding the FE resin cylinder enables downsizing of the arc extinguishing chamber.

FIG. 2 shows a second embodiment of the present invention. In this example, the PTFE hollow cylinder is connected to the PTFE resin cylinder in the example shown in FIG. 1, and the inner wall surface of the throat part is entirely covered with the PTFE resin to have an appropriate thickness. The arc-extinguishing performance of the circuit breaker is further improved in comparison with. FIG. 3 shows a third embodiment of the present invention. In this embodiment, since the substantially entire axial range of the throat portion is formed of only PTFE resin, sufficient arc extinguishing performance and radial mechanical strength can be obtained as the arc extinguishing chamber, and particularly, the number of times of breaking life is increased. Can be obtained.

FIG. 4 shows a fourth embodiment of the present invention. In this example, in the throat portion of the insulating nozzle, only the PTFE resin is used on the brazing portion side from the axial intermediate position of the hole portion excluding the brazing portion, and the non-brazing portion side is connected to the PTFE resin on the brazing portion side. It is a cylinder. In this way, by forming the PTFE resin cylinder on the side of the warp portion, P
The TFE resin cylinder serves to retain the PTFE resin portion on the brazing side so as not to separate from the insulating nozzle, and the arc extinguishing performance and mechanical strength of the arc extinguishing chamber are equivalent to those of the third embodiment (FIG. 3). However, the use reliability of the insulating nozzle is improved.

FIG. 5 shows a modification of the fourth embodiment. Fourth
Since the flange is formed at the end portion on the side opposite to the brazing portion of the PTFE resin tube in the above embodiment, the retaining function of the PTFE resin portion on the brazing portion side becomes more reliable, and the use reliability of the insulating nozzle is further improved. FIG. 6 shows a fifth embodiment of the present invention. In this embodiment, in the throat portion of the insulating nozzle, the entire inner wall surface of the hole portion excluding the brazing portion, and the entire hole wall side from the axial intermediate position of the conical surface of the brazing portion are used as the entire inner wall surface to flatten the brazing portion side. Since a cylindrical body made of PTFE resin having various end faces is embedded as a constituent member of the throat portion, the axial direction retaining resistance of the PTFE resin cylinder at the time of gas injection becomes larger than that of the embodiment (FIG. 1). The use reliability of the insulating nozzle is improved.

FIG. 7 shows a sixth embodiment of the present invention. In this embodiment, all the inner wall surfaces of the insulating material portion of the insulating nozzle are made of PTFE resin forming a cylindrical body having a proper thickness from the inner wall surface, the breaking current is large, and the insulating nozzle inner wall surface is large. Even though the arc is strongly irradiated by the arc over the entire length in the axial direction, a small arc extinguishing chamber can be used to obtain the necessary arc extinguishing performance, and it is possible to provide the necessary mechanical strength.

In each of the drawings showing the above-mentioned embodiments,
Reference numeral 20 indicates an insulating material made of PTFE resin, and reference numeral 2
Reference numeral 1 denotes an insulating material made of B-containing PTFE resin. Also,
In each of the above embodiments, the thickness of the PTFE resin cylinder from the inner wall surface of the insulating nozzle is set to withstand the consumption of the PTFE resin due to the damage caused by the arc.

[0029]

According to the present invention, the arc extinguishing chamber of the puffer type gas circuit breaker has the above-described structure.
The effects described below can be obtained. In the arc-extinguishing chamber configuration of claim 1, since the arc-extinguishing chamber is configured by combining the insulating materials having different material characteristics, by using the insulating material having the required material characteristics in the required portions, it is possible to achieve a high arc extinction even though it is small. It is possible to obtain an arc-extinguishing chamber having performance and required mechanical strength, and it is possible to significantly reduce the cost of the circuit breaker that is linked to the size of the arc-extinguishing chamber.

In the arc-extinguishing chamber configuration according to the second aspect, the insulating material within the axial range of the full separation gap between the fixed and movable contacts is electrically (insulating performance surface and arc-extinguishing performance surface) and mechanical (thermal strain). The surface of the arc-extinguishing chamber, which is exposed to the harshest conditions. Since we decided to use PTFE resin over the entire length in the circumferential direction,
The cost increase of the arc extinguishing chamber is small because the usage amount is small even if an expensive material is used as the insulating material for imparting mechanical strength within this axial range. Are offset by the miniaturization of the arc extinguishing chamber, so that the cost increase of the arc extinguishing chamber itself can be suppressed to a small extent, and the effect of claim 1 can be obtained.

In the arc-extinguishing chamber structure according to the third aspect, the PT is applied to the portion of the insulating nozzle that is most strongly irradiated by the arc.
Since the FE resin is used, the high arc extinguishing performance of the insulating nozzle is maintained, while most of the remaining insulating material can have high mechanical strength, especially when the arc extinguishing chamber is downsized. It is possible to provide an insulating nozzle suitable for a large-capacity circuit breaker having a high internal gas pressure.

In the arc-extinguishing chamber structure of claim 4, since the brazing surface of the throat portion is covered with the PTFE resin to an appropriate thickness, the effect of claim 3 is obtained, and the extinguishing chamber is further extinguished. The insulating nozzle can have improved arc performance. In the arc-extinguishing chamber configuration according to claim 5, the insulating nozzle is not upsized even if the outer diameter of the throat portion is as large as the outer diameter of the body portion (cylindrical portion) of the insulating nozzle, that is, the circuit breaker and peripheral members for accommodating the insulating nozzle. Since the size of the throat is not increased, the radial thickness of the throat portion can be increased and P
Since sufficient mechanical strength can be obtained only with TFE resin, it is possible to obtain a small-sized insulating nozzle having a long cutoff life.

In the arc-extinguishing chamber structure of claim 6, even if the PTFE resin is peeled off due to the difference in the easiness of deformation between the PTFE resin and the remaining insulating material (the difference in strain amount under the same stress). Since the cylindrical portion acts so as to retain it, the effect of claim 5 can be retained and the insulating nozzle can be made highly reliable in use. In the arc-extinguishing chamber configuration according to the seventh aspect, the use reliability of the insulating nozzle can be further improved by the configuration according to the sixth aspect.

In the arc extinguishing chamber structure according to the eighth aspect, it is possible to provide an insulating nozzle which has a longer number of interruption life times and higher reliability in use than the structure according to the third aspect. Claim 9
In the arc-extinguishing chamber configuration, since the entire inner wall surface of the insulating nozzle is covered with the PTFE resin layer, the entire inner wall surface can be an insulating nozzle suitable for interrupting a large current that receives intense heat radiation of the arc.

[Brief description of drawings]

1 is a cross-sectional view showing a first embodiment of a puffer type gas circuit breaker arc extinguishing chamber configuration according to the present invention.

FIG. 2 is a sectional view showing a second embodiment of a puffer type gas circuit breaker arc extinguishing chamber structure according to the present invention.

FIG. 3 is a sectional view showing a third embodiment of the puffer type gas circuit breaker arc extinguishing chamber configuration according to the present invention.

FIG. 4 is a sectional view showing a fourth embodiment of a puffer type gas circuit breaker arc extinguishing chamber configuration according to the present invention.

5 is a sectional view showing a modification of the embodiment shown in FIG.

FIG. 6 is a sectional view showing a fifth embodiment of the puffer type gas circuit breaker arc extinguishing chamber configuration according to the present invention.

FIG. 7 is a cross-sectional view showing a sixth embodiment of the puffer type gas circuit breaker arc extinguishing chamber structure according to the present invention.

FIG. 8 is a cross-sectional view showing an example of a main configuration of a puffer type gas circuit breaker including an arc extinguishing chamber according to a conventional configuration example.

[Explanation of symbols]

 1 Metal Container (Container) 4 Fixed Contact 5 Insulation Nozzle (Extinguishing Chamber) 6 Moving Contact 7 Puffer Cylinder 8 Fixed Piston 12 Puffer Chamber 20 Insulation 21 Insulation

Claims (9)

[Claims] 1. A container filled with an arc-extinguishing gas, a fixed contact, a movable contact coming in contact with and separated from the fixed contact, a puffer cylinder interlocking with the movable contact, and a puffer chamber in the puffer cylinder. A fixed piston to be formed, and a cylindrical arc-extinguishing chamber that surrounds the movable contactor and guides the gas compressed in the puffer chamber and discharged from the puffer chamber blowing hole to the separation gap of the fixed / movable contactor. In a puffer type gas circuit breaker provided with the arc extinguishing chamber, the arc extinguishing chambers are layered in such a manner that a plurality of insulating materials having mutually different material characteristics are axially joined and / or in the thickness direction of the arc extinguishing chamber wall. A puffer-type gas circuit breaker characterized by being used as described above. 2. The insulating material in the arc-extinguishing chamber according to claim 1, wherein the insulating material located in the axial range of the full separation gap between the fixed and movable contacts is in the axial direction. A puffer-type gas circuit breaker, characterized in that the whole or a part of the range is made of PTFE resin over an appropriate thickness from the wall surface of the arc extinguishing chamber and the entire length in the circumferential direction. 3. The throat part according to claim 1 or 2, wherein the cylindrical arc-extinguishing chamber is integrated with the movable contactor to be movable, and the fixed contactor is moved in and out, and the throat part is axially outside of the throat part. When the nozzle is formed by expanding it into a funnel shape, and is formed as an insulating nozzle composed of only insulating material at least in the range of the full opening gap between the fixed and movable contacts, it is a throat for the fixed contact to come in and out. A puffer-type gas circuit breaker, characterized in that a PTFE resin having an appropriate thickness from the inner peripheral surface of the hole portion other than the wax-like widened portion is formed over the entire length in the circumferential direction. 4. The PT according to claim 3, wherein the conical surface forming the wax-like expansion of the insulating nozzle throat portion constitutes a hole portion other than the wax-like expansion portion of the throat portion.
PTFE formed by connecting to a tubular body made of FE resin
A puffer type gas circuit breaker characterized by being formed as an inner wall surface of a hollow conical body made of resin. 5. The throat part according to claim 1 or 2, wherein the cylindrical arc-extinguishing chamber is integrated with the movable contactor to be movable, and the fixed contactor is moved in and out, and the throat part is axially outside of the throat part. When it is formed as an insulating nozzle that is formed by spreading it in a funnel shape and at least the entire opening gap axial direction between the fixed and movable contacts is made up of insulating material only, the shaft of the throat part including the brazing part A puffer-type gas circuit breaker characterized in that only PTFE resin is used as the insulating material in the substantially entire range of the direction. 6. The throat part according to claim 1 or 2, wherein the cylindrical arc-extinguishing chamber is integrally movable with the movable contactor, and the fixed contactor is moved in and out, and the throat part is axially outside of the throat part. When it is formed as a funnel and is formed as an insulating nozzle composed of only insulating material at least within the range of the full opening gap between the fixed and movable contacts, it is formed as an insulating nozzle. A puffer-type gas circuit breaker, characterized in that a whole portion from the axial intermediate position to the side of the funnel portion and a cylindrical portion having an appropriate thickness from the inner wall surface of the hole portion in the axial direction remaining in the throat portion are made of PTFE resin. 7. The cylindrical portion made of PTFE resin, which is formed on the side of the warp portion from the axially intermediate position of the throat portion excluding the braze portion, has a cylindrical shape at the end portion on the side of the warp portion. A puffer-type gas circuit breaker, which is formed in a shape including a flange having an outer diameter larger than the outer diameter. 8. The throat part, wherein the cylindrical arc-extinguishing chamber is made movable by being integrated with the movable contactor and the fixed contactor goes in and out, according to claim 1 or 2. When the nozzle is formed by expanding it into a funnel shape and is formed as an insulating nozzle composed of only insulating material at least within the range of the full opening gap between the fixed and movable contacts, the brazing part is attached to the throat part. The entire inner wall surface of the excepted hole and the entire inner wall surface from the axial intermediate position of the conical surface of the brazing portion are used as the entire inner wall surface, and P has a flat end surface on the brazing portion side.
A puffer type gas circuit breaker in which a tubular body made of TFE resin is embedded as a constituent member of the throat portion. 9. The throat part according to claim 1 or 2, wherein the cylindrical arc-extinguishing chamber is integrated with the movable contactor to be movable, and the fixed contactor is moved in and out, and the throat part is axially outside of the throat part. When the insulating nozzle is formed by expanding it into a funnel shape, and is formed as an insulating nozzle composed only of the insulating material at least within the range of the fully opened gap between the fixed and movable contacts, All inner wall surfaces
PT that forms a cylindrical body layered from the inner wall surface to an appropriate thickness
A puffer type gas circuit breaker characterized by being formed of FE resin.