JP7287135B2 - gas circuit breaker - Google Patents

Description

TECHNICAL FIELD The present invention relates to a thermal puffer arc extinguishing type gas circuit breaker that is used to interrupt a fault current in an electric power system and interrupts an arc generated between contacts by blowing gas onto the arc.

Gas circuit breakers are required to have high reliability as well as to ensure performance. In that respect, it is ideal to have an arc-extinguishing chamber structure that can secure performance with lower operating energy and reduce mechanical stress. As part of improving the arc-extinguishing performance, attempts to speed up the pressure rise operation in the arc-extinguishing chamber of a gas circuit breaker are attracting attention.

As an example of such technology, for example, a gas circuit breaker disclosed in Patent Document 1 is known.

JP-A-49-3163

However, the technique described in Patent Document 1 has the following problems. First, in the configuration described in Patent Literature 1, since the gas inlet and outlet are the same, the pressure in the heat puffer chamber cannot be maintained sufficiently high. Therefore, if the arc extinguishing time is long, the arc extinguishing performance is degraded.

SUMMARY OF THE INVENTION The present invention has been made in view of the conventional problems described above, and provides a gas circuit breaker with improved arc-extinguishing performance by slowing down the pressure drop in the puffer chamber and maintaining a high pressure state for a long time. for the purpose.

In order to solve the above problems, a gas circuit breaker according to aspect 1 of the present invention includes a fixed contact and a movable contact capable of coming into contact with and separating from the fixed contact by moving in the longitudinal direction of the fixed contact. and a first cylinder fixed to the movable contact so as to surround the movable contact and forming a heat puffer chamber extending in the longitudinal direction of the movable contact between the movable contact and the first cylinder; A first contact is fixed to the first cylinder so as to surround the fixed contact and the movable contact, and communicates with the heat puffer chamber to form a gas flow path extending between the movable contact and the first contact. and a flow control valve for adjusting the flow rate of the gas flowing in the connection area between the heat puffer chamber and the gas flow path.

According to the above configuration, when the gas heated to a high temperature due to the arc generated between the electrodes due to the large current flows into the heat puffer chamber through the gas flow path, the flow control valve opens and the gas enters the heat puffer chamber, causing the heat to flow into the heat puffer chamber. The pressure in the puffer chamber can be increased. When gas flows out from the heat puffer chamber through the gas flow path, the flow control valve is closed to control the outflow of gas, and the pressure in the heat puffer chamber can be kept high until the moment of shutoff, An improvement in interrupting performance can be realized.

In the gas circuit breaker according to aspect 2 of the present invention, in aspect 1 above, the cross-sectional area of the surface perpendicular to the longitudinal direction of the gas flow path is larger than the cross-sectional area of the surface perpendicular to the longitudinal direction of the heat puffer chamber. The flow regulating valve is small and provided in the shape of a flange around the movable contact, has a surface area larger than a cross-sectional area of a plane perpendicular to the longitudinal direction of the gas flow path, and has a longitudinal direction of the gas flow path. It may have a hole smaller than the cross-sectional area of a plane perpendicular to the direction, and may be arranged in the heat puffer chamber so as to be slidable with respect to the movable contact.

According to the above configuration, when gas flows out from the heat puffer chamber, the flow control valve is closed, and the flow rate of gas can be controlled via the hole provided in the flow control valve.

In the gas circuit breaker according to aspect 3 of the present invention, in aspect 2 above, when gas flows into the heat puffer chamber from the gas flow path, the flow control valve slides from the connection region into the heat puffer chamber. When the heat puffer chamber moves and the gas flows out from the heat puffer chamber to the gas flow path, the flow control valve slides from the inside of the heat puffer chamber to the connection area, and causes the gas to flow out from the hole. may be configured to adjust the gas flow rate.

According to the above configuration, the inflow and outflow of gas in the heat puffer chamber can be adjusted by the sliding movement of the flow control valve, and the pressure in the heat puffer chamber can be maintained.

In the gas circuit breaker according to aspect 4 of the present invention, in the above aspect 2 or 3, when the flow control valve slides from the connection area into the heat puffer chamber, the movable contact slides The configuration may further include a limiting mechanism for limiting the distance.

According to the above configuration, when gas flows out from the heat puffer chamber, the flow control valve is closed, and the flow rate of gas can be controlled via the hole provided in the flow control valve.

A gas circuit breaker according to aspect 5 of the present invention is, in any one of aspects 1 to 4, fixed to the movable contact so as to surround a tip of the movable contact, and the first guide and A configuration may further include a second guide that forms a gas flow path extending between good.

According to the above configuration, a desired gas flow path can be formed, and the arc-extinguishing gas can be blown to a desired position of the arc.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to maintain the pressure in the heat puffer chamber in a high state and improve the blocking performance.

According to the present invention, when gas heated to a high temperature due to an arc generated between electrodes due to a large current flows into the heat puffer chamber through the gas flow path, the flow control valve is opened and the gas enters the heat puffer chamber. Chamber pressure can be increased. When gas flows out from the heat puffer chamber through the gas flow path, the flow control valve is closed to control the outflow of gas, and the pressure in the heat puffer chamber can be kept high until the moment of shutoff, It is effective in being able to realize an improvement in interrupting performance.

1 is a schematic cross-sectional view of a single blast type gas circuit breaker according to a prior art example; FIG. 1 is a schematic cross-sectional view schematically showing a breaking portion of a gas circuit breaker according to an embodiment of the present invention; FIG. 1 is a schematic cross-sectional view that schematically shows a gas flow path of a gas circuit breaker according to an embodiment of the present invention; FIG. 1 is a schematic cross-sectional view that schematically shows a gas flow path of a gas circuit breaker according to an embodiment of the present invention; FIG. It is a schematic diagram showing typically a flow control valve of a gas circuit breaker concerning an embodiment of the present invention. It is a schematic diagram showing typically a flow control valve of a gas circuit breaker concerning an embodiment of the present invention. FIG. 4 is a schematic cross-sectional view schematically showing a gas flow path of a gas circuit breaker according to another embodiment of the present invention; FIG. 4 is a schematic cross-sectional view schematically showing a gas flow path of a gas circuit breaker according to another embodiment of the present invention; FIG. 4 is a schematic diagram schematically showing a flow control valve of a gas circuit breaker according to another embodiment of the present invention;

[Embodiment 1]
An embodiment of the present invention will be described in detail below in comparison with a prior art configuration having a configuration partially in common with the embodiment of the present invention.

<Composition of the entire conventional gas circuit breaker>
FIG. 1 is a schematic cross-sectional view of a gas circuit breaker 100 according to an example of the prior art. 101 in FIG. 1 is a gas chamber inside the insulator, in which SF ₆ gas is sealed at a pressure of 2 to 3 kg/cm ² . 102 is a fixed contact (also called a "fixed electrode"), and 103 is a movable contact (also called a "movable electrode"). A cylinder 104 is integrated with the movable contactor 103 .

1, the longitudinal direction of the contactor is the Y-axis, the radial direction of the cylinder 104 perpendicular to the Y-axis is the X-axis, and the direction perpendicular to the paper is the Z-axis. and A center line parallel to the Y-axis direction was arranged to pass through the origins of the X-axis and the Z-axis. In FIG. 1 , the negative region of the X-axis represents the power-on state, and the positive region of the X-axis represents the cut-off state.

The cylinder 104 is fixed to the movable contact 103 so as to surround the movable contact 103 and forms a cylinder inner chamber with the movable contact 103 . 105 is part of the cylinder and is a gas flow guide that uses arc resistant insulation and is designed to increase cooling effectiveness. A guide 106 supports the movable contactor 103 and is sealed so that _SF6 gas does not leak.

A piston 107 is movable within the cylinder 104 . The piston 107 is provided so as to close the end of the cylinder inner chamber on the operation mechanism side. The leak prevention plate 116 is provided in a flange shape around the fixed contact 102, while the guide 105 extends toward the leak prevention plate 116 and engages the leak prevention plate 116 when the gas circuit breaker 100 is in the closed state. together to seal the inner chamber of the cylinder.

In addition, the leak prevention plate 117 is provided in the middle of the cylinder inner chamber, and divides the cylinder inner chamber into a first arc extinguishing chamber 118 (corresponding to a heat puffer chamber) located on the fixed contact 102 side and a heat puffer chamber located on the operation mechanism side. A second arc-extinguishing chamber (corresponding to a mechanical puffer chamber) is provided so as to be separated from the second arc-extinguishing chamber (corresponding to a mechanical puffer chamber), and is fixed to the movable contactor 103 and the cylinder 104 . The piston 107 is driven by a drive device 111 separate from the drive device 110 that drives the movable contactor 103 and performs piston movement with respect to the cylinder 104 while the gas circuit breaker 100 is in the closed state.

108 is an example of a current outlet from the movable contact 103 and 109 is an example of a current outlet from the fixed contact 102 . 112 is an insulating rod that connects the movable contact 103 and the driving device 110, 113 is a device that connects the piston 107 and the driving device 111, and 114 is an insulator that forms a gas container. Reference numeral 115 denotes an insulating cylinder for insulating between the cut-off portion and the driving portion.

<Structure of Breaking Unit of the Present Embodiment>
A characteristic mechanism according to the present invention, which is arranged in the gas chamber and maintains the inside of the cylinder at a high pressure, among the shutoff units in the configuration shown in FIG. 1, will be described in detail.

FIG. 2 is a schematic cross-sectional view schematically showing a breaking portion of a gas circuit breaker according to one embodiment of the present invention. The gas circuit breaker according to one embodiment of the present invention includes at least a fixed contact 2, a movable contact 3 capable of contacting and separating from the fixed contact 2 by moving in the longitudinal direction of the fixed contact 2, and the A first cylinder fixed to the movable contact 3 so as to surround the movable contact 3 and forms a heat puffer chamber 18 extending in the longitudinal direction of the movable contact 3 between the movable contact 3 and the first cylinder. 4 , fixed to the first cylinder 4 so as to surround the fixed contact 2 and the movable contact 3 , communicate with the heat puffer chamber 18 and extend between the movable contact 3 . It is characterized by having a first guide 5 forming a gas flow path 26 and a flow control valve 24 for adjusting the flow rate of gas flowing in the connection area between the heat puffer chamber 18 and the gas flow path 26 .

As for the three-dimensional orthogonal coordinate axes in FIG. 2, similarly to FIG. The vertical direction was taken as the Z-axis. A center line parallel to the Y-axis direction was arranged to pass through the origins of the X-axis and the Z-axis.

The arc extinguishing chamber structure shown in FIG. 2 has a two-chamber structure consisting of a thermal puffer chamber 18 that pressurizes using arc energy when interrupting a large current, and a mechanical puffer chamber 20 that pressurizes by mechanical compression action when interrupting a medium or small current. It's becoming

When a large current is interrupted, the pressure in the heat puffer chamber 18 is increased to a required value by arc energy, and the arc is extinguished by blowing gas onto the arc at the current zero point. On the other hand, in the medium and small current range, since the pressure rise due to the arc energy is small, the compression of the mechanical puffer chamber 20 blows gas to extinguish the arc.

A hole communicating between the thermal puffer chamber 18 and the mechanical puffer chamber 20 is provided on the operation mechanism side of the first cylinder 4, and a valve 19 is arranged in the hole. Similarly, a hole may be provided on the operation mechanism side of the second cylinder 21, and the valve 22 may be arranged in the hole.

At least the movable contactor 3, the first cylinder 4, and the first guide 5 form an integral structure. In another preferred embodiment, the movable contact 3, the first cylinder 4, the first guide 5 and the second guide 23 (described below) form an integral structure. The mechanical puffer chamber 20 is compressed by driving the integrated structure relative to the second cylinder 21 by a driving device (not shown).

The valve 19 is a check valve that allows gas to flow from the mechanical puffer chamber 20 to the thermal puffer chamber 18, but prevents gas from flowing from the thermal puffer chamber 18 to the mechanical puffer chamber 20. be done. The valve 22 acts to prevent the pressure in the mechanical puffer chamber 20 from rising above a certain value in order to reduce the reaction force to the driving device due to the increased pressure in the mechanical puffer chamber 20 .

The fixed contact (fixed electrode) 2 and the movable contact (movable electrode) 3 are preferably made of metal. The fixed contact (fixed electrode) 2 and the movable contact (movable electrode) 3 may be made of the same metal, or may be made of different metals.

In a preferred embodiment, the first cylinder 4 forming the thermal puffer chamber 18, the second cylinder 21 forming the mechanical puffer chamber 20, the valves 19 and 22 are made of metal. Each member may be made of the same metal, or may be made of different metals.

<High pressure holding mechanism>
3 and 4 are enlarged schematic diagrams of the rectangular area surrounded by the dotted line in FIG.

FIG. 3 is a schematic cross-sectional view schematically showing how gas flows into the heat puffer chamber 18 through the gas flow path 26 of the gas circuit breaker according to one embodiment of the present invention. FIG. 4 is a schematic cross-sectional view schematically showing how gas flows out of the heat puffer chamber 18 through the gas flow path 26 of the gas circuit breaker according to one embodiment of the present invention.

As shown in FIGS. 2 to 4, the flow control valve 24 has a flange shape around the movable contact 3 in the heat puffer chamber 18 so as to block the connection area between the heat puffer chamber 18 and the gas flow path 26. It is preferably provided. The flow control valve 24 preferably has a hole 241 that communicates the heat puffer chamber 18 and the gas flow path 26 . The cross-sectional area of the hole 241 on the XZ plane is smaller than the cross-sectional area of the gas channel 26 on the XZ plane.

In other words, in the gas circuit breaker according to the embodiment of the present invention, the cross-sectional area of the plane perpendicular to the longitudinal direction of the gas flow path 26 is smaller than the cross-sectional area of the plane perpendicular to the longitudinal direction of the heat puffer chamber 18. , the flow control valve 24 is provided in the shape of a flange around the movable contact 3, has a surface area larger than the cross-sectional area of a plane perpendicular to the longitudinal direction of the gas flow channel 26, and It is characterized by having a hole 241 smaller than the cross-sectional area of the plane perpendicular to the .

<Gas flow rate adjustment>
The gas circuit breaker according to one embodiment of the present invention is characterized in that the flow control valve 24 is arranged in the heat puffer chamber 18 so as to be slidable with respect to the movable contactor 3 .

As shown in FIG. 3, an arc 27 is generated between the fixed contact 2 and the movable contact 3, and when a large current is interrupted, the gas pressurized by the energy of the arc 27 flows through the gas flow path 26. It flows into the heat puffer chamber 18 . In this case, not only does the gas flow into the heat puffer chamber 18 through the hole 241, but also the flow control valve 24 blocking the connection area between the heat puffer chamber 18 and the gas flow path 26 slides toward the operating mechanism. . Due to the sliding motion, a large amount of gas flows into the heat puffer chamber 18 and the pressure in the heat puffer chamber 18 increases.

In other words, in the gas circuit breaker according to the embodiment of the present invention, when gas flows into the heat puffer chamber 18 from the gas passage 26, the flow control valve 24 slides inward from the connection region to the heat puffer chamber 18. characterized by movement.

It is preferable that the sliding movement of the flow control valve 24 toward the operation mechanism is restricted within a certain sliding distance by a restriction mechanism. In a preferred embodiment, a bump 25 may be provided on the outer peripheral surface of the movable contact 3 as a limiting mechanism. The engagement of the flow control valve 24 with the bump 25 limits the desired sliding travel distance.

In other words, in the gas circuit breaker according to one embodiment of the present invention, when the flow control valve 24 slides from the connection area into the heat puffer chamber 18, the movable contact 3 limits the sliding movement distance. It is characterized by further having a limiting mechanism. The distance from the connection area between the heat puffer chamber 18 and the gas flow path 26 to the bumps 25 can be determined arbitrarily.

On the other hand, when the gas flows out from the heat puffer chamber 18, as shown in FIG. slide up to The gas in the heat puffer chamber 18 flows out through the hole 241 of the flow control valve 24 into the gas flow path 26 and is blown to the arc 27 along the first guide 5 through the gas flow path 26 .

In other words, in the gas circuit breaker according to the embodiment of the present invention, when the gas flows out from the heat puffer chamber 18 to the gas passage 26, the flow control valve 24 slides from the inside of the heat puffer chamber 18 to the connection area. It is characterized by adjusting the gas flow rate by dynamically moving and causing the gas to flow out from the hole 241 .

When the gas in the heat puffer chamber 18 flows out, the flow control valve 24 is closed to limit the flow rate of the gas according to the size of the cross-sectional area of the hole 241 . As described above, when the current value is large, the gas heated to a high temperature by the arc generated between the contacts enters the heat puffer chamber 18 through the gas flow path 26, and the pressure in the heat puffer chamber 18 rises. . In order to increase the pressure of the heat puffer chamber 18, it is necessary to take in a large amount of high-temperature gas. , the amount of gas flowing out from the heat puffer chamber 18 also increased. Therefore, if the time to extinguish the arc becomes longer, the pressure in the heat puffer chamber 18 decreases, resulting in a decrease in arc extinguishing performance.

By providing the flow control valve 24 according to the present embodiment in the connection area, the outflow of gas is restricted, the pressure in the heat puffer chamber 18 can be kept high until the moment of shutoff, and the shutoff performance is improved. do.

The gas flow rate is adjusted by the hole 241 when the flow control valve 24 having a sufficient size (the size of the annular cross-sectional area in the XZ plane) to close the gas inlet/outlet (connection area) closes the connection area. It is not limited to the mode of adjustment.

In another preferred embodiment, the gas flow rate can be regulated by a flow control valve 28 shown in FIGS. 7 and 8 are similar to FIGS. 3 and 4, which are enlarged schematic diagrams of the rectangular area enclosed by the dotted line in FIG.

FIG. 7 is a schematic cross-sectional view schematically showing how gas flows into the heat puffer chamber 18 through the gas flow path 26 of the gas circuit breaker according to another embodiment of the present invention. FIG. 8 is a schematic cross-sectional view schematically showing how gas flows out of the heat puffer chamber 18 through the gas flow path 26 of the gas circuit breaker according to another embodiment of the present invention. 7 and 8 employ a flow control valve 28 in place of the flow control valve 24 of FIGS. 3 and 4. FIG.

A gas circuit breaker according to another embodiment of the present invention is characterized in that the flow control valve 28 is arranged in the heat puffer chamber 18 so as to be slidable with respect to the movable contactor 3 . The outer diameter of flow regulating valve 28 is smaller than the outer diameter of flow regulating valve 24 and does not completely block the connection area. A gap is formed between the outer diameter of the gas flow path and the outer diameter of the flow control valve 28 in the XZ plane of the connection area.

As shown in FIG. 7, an arc 27 is generated between the fixed contact 2 and the movable contact 3, and when a large current is interrupted, the gas pressurized by the energy of the arc 27 flows through the gas flow path 26. It flows into the heat puffer chamber 18 . In this case, the flow regulating valve 28, which partially blocks the connection area, slides toward the operating mechanism. Due to the sliding motion, a large amount of gas flows into the heat puffer chamber 18 and the pressure in the heat puffer chamber 18 increases.

The sliding movement of the flow control valve 28 toward the operating mechanism is preferably limited within a certain sliding distance by a limiting mechanism. In a preferred embodiment, a bump 25 may be provided on the outer peripheral surface of the movable contact 3 as a limiting mechanism. The engagement of the flow control valve 28 with the bump 25 limits the desired sliding travel distance. The distance from the connection area between the heat puffer chamber 18 and the gas flow path 26 to the bumps 25 can be determined arbitrarily.

On the other hand, when the gas flows out from the heat puffer chamber 18, as shown in FIG. slide up to The gas in the heat puffer chamber 18 flows out into the gas flow path 26 through a gap formed outside the outer diameter of the flow control valve 28, and flows through the gas flow path 26 along the first guide 5 to form an arc. 27 is sprayed.

By providing the flow control valve 28 according to such another embodiment in the connection area, the outflow amount of gas is restricted, and the pressure in the heat puffer chamber 18 can be kept high until the moment of shutoff, Breaking performance is improved.

Although the sliding movement of the flow rate control valve 24 has been specifically described above, the gas flow rate adjustment is not limited to the sliding movement of the flow rate control valve 24 .

In yet another preferred embodiment, a diaphragm-type flow regulating valve can be arranged in the area of connection between the heat puffer chamber 18 and the gas flow path 26 . An inner circular portion of a diaphragm, consisting of an annular flat plate with a hole similar to the sliding flow control valve 24, can be arranged on the outer peripheral surface of the movable contact 3 in the connection area.

When the gas flows into the heat puffer chamber 18 from the gas passage 26, the inner circular portion of the flow control valve of the annular diaphragm does not slide, and the outer circular portion is inclined inwardly from the connection area to the heat puffer chamber 18. Transform into In this case, not only does the gas flow into the heat puffer chamber 18 through the holes, but also a large amount of gas flows into the heat puffer chamber 18 through the gaps caused by the deformation of the diaphragm, and the pressure in the heat puffer chamber 18 increases. Rise.

On the other hand, when the gas flows out from the heat puffer chamber 18, the annular diaphragm returns from the deformed state to the annular flat plate state. The gas in the heat puffer chamber 18 flows out to the gas flow path 26 through the hole of the flow control valve and is blown to the arc 27 along the first guide 5 via the gas flow path 26 .

<Flow control valve>
FIG. 5 is a schematic diagram schematically showing the flow control valve 24 of the gas circuit breaker according to the embodiment of the present invention. FIG. 5 schematically shows the flow control valve 24 in the XZ plane view of the three-dimensional orthogonal coordinates whose orientation is explained in FIG. The Y-axis is arranged in a direction perpendicular to the plane of the paper through the intersection (origin) of the X-axis and the Z-axis shown in FIG.

In the preferred embodiment shown in FIG. 5, the flow control valve 24 is formed from an annular flat metal plate centered at the intersection of the X and Z axes. The inner diameter of the ring is preferably substantially the same as the outer diameter of the movable contactor 3 .

In the preferred embodiment shown in FIG. 5, four arcuate holes 241 are arranged along the inner circle forming the annular inner diameter in the XZ plane. The hole 241 is arranged so as to allow communication between the gas flow path 26 and the heat puffer chamber 18 when the flow control valve 24 is arranged in contact with the cylinder 4 (see FIG. 4). Although four arc-shaped holes 241 are shown in the example shown in FIG. 5, the number of holes 241 is not limited to four, and any number of arc-shaped holes can be provided.

FIG. 6 is a schematic diagram schematically showing a flow control valve 24' of a gas circuit breaker according to another preferred embodiment of the present invention. Similar to the flow control valve 24 of FIG. 5, the flow control valve 24' is also formed from an annular flat metal plate centered at the intersection of the X-axis and the Z-axis.

A difference from the flow control valve 24 of FIG. 5 is that a plurality of circular holes 242 are arranged along the inner circle forming the annular inner diameter in the XZ plane. Similarly to the hole 241, the hole 242 is arranged so that the gas flow path 26 and the heat puffer chamber 18 can communicate with each other when the flow control valve 24' is arranged in contact with the cylinder 4. is preferred.

The flow control valve 24' shown in FIG. 6 shows an example in which 16 holes 242 are provided, but the number of holes 242 is not limited to 16 and any number of holes 242 can be provided. Also, the shape of the hole 242 is not limited to circular, and can be any shape.

The total cross-sectional area of the holes 242 in the XZ plane is configured to be smaller than the cross-sectional area of the gas channel 26 in the XZ plane.

FIG. 9 is a schematic diagram schematically showing a flow control valve 28 of a gas circuit breaker according to another preferred embodiment of the present invention. As with the flow control valve 24 shown in FIG. 5, the flow control valve 28 is also preferably formed from an annular flat metal plate centered at the intersection of the X-axis and the Z-axis.

As described above, the difference between the flow control valve 24 and the flow control valve 28 shown in FIG. It preferably has an outer diameter that partially closes the connection area in the XZ plane. The total cross-sectional area in the XZ plane of the gap generated between the outer diameter of the gas flow path and the outer diameter of the flow control valve 28 in the connection region is smaller than the cross-sectional area of the gas flow path 26 in the XZ plane. , preferably constitutes the flow control valve 28 .

<Guide>
Gas is blown along the first guide 5 onto the arc 27 as described above with respect to FIG. A second guide 23 is preferably further provided for blowing the arc-extinguishing gas to the desired position of the arc. As shown in FIG. 4, a second guide 23 is arranged so as to surround the tip of the movable contactor 3 . An annular gas flow path 26 can be formed between the second guide 23 and the first guide 5 .

In other words, in the gas circuit breaker according to one embodiment of the present invention, the gas flow is fixed to the movable contact 3 so as to surround the tip of the movable contact 3 and extends between the first guide 5 and the gas flow It further comprises a second guide 23 forming a passage 26, said gas passage 26 guiding gas to an arc 27 generated between the fixed contact 2 and the movable contact 3. .

The first guide 5 and the second guide 23 are preferably made of Teflon (registered trademark) resin or the like adapted to a high-temperature gas environment due to arc energy when a large current is interrupted. The gas flowing through the gas flow path 26 may reach 1,000 degrees Celsius or more due to the energy of the arc 27 . Even with heat-resistant Teflon (registered trademark) resin, gas may be generated from each guide surface in such a high-temperature environment. The gas thus generated may also contribute to the pressure increase in the heat puffer chamber 18 .

[Embodiment 2]
Other embodiments of the invention are described below. For convenience of description, members having the same functions as those of the members described in the above embodiments are denoted by the same reference numerals, and description thereof will not be repeated.

In this embodiment, the second guide 23 can be arranged so as to extend and surround not only the tip of the movable contact 3 but also the inside of the heat puffer chamber 18 . In this case, the flow regulating valve is characterized by being provided like a flange around the outer periphery of the second guide 23 .

In this embodiment, it is preferable that the annular inner diameter of the flow regulating valve formed from the annular flat plate be approximately the same as the outer diameter of the second guide 23 .

The present invention is not limited to the above-described embodiments, but can be modified in various ways within the scope of the claims, and can be obtained by appropriately combining technical means disclosed in different embodiments. is also included in the technical scope of the present invention.

2 Fixed contact 3 Movable contact 4 First cylinder 5 First guide 18 Thermal puffer chamber 19 Check valve 20 Mechanical puffer chamber 21 Second cylinder 23 Second guides 24, 24', 28 Flow control valve 25 Bump (limiting mechanism)
26 gas flow path 27 arc 100 gas circuit breaker

Claims (4)

a stationary contact;
a movable contact capable of contacting and separating from the fixed contact by moving in the longitudinal direction of the fixed contact;
a cylinder fixed to the movable contact so as to surround the movable contact and forming a heat puffer chamber extending in the longitudinal direction of the movable contact between the movable contact and the movable contact;
a first guide that is fixed to the cylinder so as to surround the fixed contact and the movable contact and that forms a gas flow path that communicates with the heat puffer chamber and extends between the movable contact and the fixed contact; ,
a flow rate adjustment valve that adjusts a flow rate of gas flowing in a connection area between the heat puffer chamber and the gas flow path;
the flow control valve transitions between a closed state and an open state according to a pressure difference between the heat puffer chamber and the gas flow path;
the gas flow rate in the closed state is less than the gas flow rate in the open state;
the cross-sectional area of the plane perpendicular to the longitudinal direction of the gas flow path is smaller than the cross-sectional area of the plane perpendicular to the longitudinal direction of the heat puffer chamber;
The flow control valve is provided in a flange shape around the movable contact, has a surface area larger than a cross-sectional area of a plane perpendicular to the longitudinal direction of the gas flow channel, and It has a hole smaller than the cross-sectional area of the vertical plane, and is arranged in the heat puffer chamber so as to be slidable with respect to the movable contact.
A gas circuit breaker characterized by: when the gas flows into the heat puffer chamber from the gas flow path, the flow control valve slides from the connection region into the heat puffer chamber;
When the gas flows out from the heat puffer chamber to the gas flow path, the flow control valve slides from the inside of the heat puffer chamber to the connection area, and causes the gas to flow out from the hole. 2. The gas circuit breaker according to claim 1 , wherein is adjusted. 3. The method according to claim 1 , further comprising a limiting mechanism for limiting a sliding movement distance of said movable contact when said flow control valve slides from said connection area into said heat puffer chamber. A gas circuit breaker as described. further comprising a second guide fixed to the movable contact so as to surround the tip of the movable contact and forming a gas flow path extending between the first guide and the first guide;
4. The gas circuit breaker according to any one of claims 1 to 3 , wherein the gas flow path guides gas to an arc generated between the fixed contact and the movable contact.

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