WO2023157079A1

WO2023157079A1 - Gas circuit breaker

Info

Publication number: WO2023157079A1
Application number: PCT/JP2022/005947
Authority: WO
Inventors: 幸司吉瀬; 泰規中村; 惠介武石
Original assignee: 三菱電機株式会社
Priority date: 2022-02-15
Filing date: 2022-02-15
Publication date: 2023-08-24
Also published as: JPWO2023157079A1; JP7487855B2

Abstract

Provided is a gas circuit breaker capable of improving the effect of cooling a gas that has reached a high temperature as a result of being blown toward an arc.　A gas circuit breaker according to the present disclosure comprises: a sealed container (1) enclosing therein an insulating gas; a fixed arc contact (11) and a movable arc contact (6) which are provided in the sealed container (1) and are arranged so as to be coaxially opposite to each other and to be able to contact with/separate from each other; a gas blowing mechanism (5) for blowing the insulating gas to an arc generated when the movable arc contact (6) and the fixed arc contact (11) are separated from each other; an insulating nozzle (9) disposed so as to surround an arc region (13) in which the arc is generated; a cooling cylinder (10) that is disposed downstream of the insulating nozzle (9) in a flowing direction (2) of the insulating gas and that cools the insulating gas blown to the arc; and a stirring part (12) that includes a stirring member for separating the flow of the insulating gas and that is attached to a leading end part (92) which is an end of the insulating nozzle (9) extending toward the cooling cylinder (10) side.

Description

gas circuit breaker

The present disclosure relates to a gas circuit breaker equipped with a cooling cylinder that cools insulating gas blown onto an arc.

The power system is equipped with a gas circuit breaker that opens and closes the current circuit and interrupts the short-circuit current. A gas circuit breaker opens a current circuit when an excessive current flows through a power system due to a lightning strike or the like. At this time, an arc is generated in the open portion of the current circuit, and a short-circuit current flows. A gas circuit breaker is designed to extinguish an arc by blowing a high-temperature, high-speed insulating gas generated by the energy of the discharge itself onto the arc in order to interrupt the short-circuit current caused by the arc.

The blown insulating gas is heated by the arc to a high temperature. If the temperature or amount of the gas between the voltage application portion and the ground portion rises, dielectric breakdown may occur, so it is necessary to diffuse the heat of the gas. As one countermeasure, there is a cooling method that promotes mixing of the high-temperature insulating gas with the ambient low-temperature gas after blowing out the arc (see, for example, Patent Document 1).

In Patent Document 1, a guide plate installed as a stirring member between the end of a fixed arc contact and a fixed support arranged around the fixed arc contact changes the direction of the gas flow, We propose a gas circuit breaker that promotes mixing and cooling with low-temperature gas.

JP-A-10-12104

However, in the gas circuit breaker according to Patent Document 1, the agitating member is installed at the end of the fixed arc contact located downstream of the insulating nozzle in the flow direction of the high-temperature insulating gas. When the movable arc contact and the fixed arc contact are separated by opening the current circuit, the separation distance causes the stirring member to move further away from the arc area where the arc is generated. In other words, after blowing out the arc, the high-temperature insulating gas leaves the insulating nozzle and travels a certain distance to the end of the fixed arc contact, and then is stirred by the stirring member changing the flow direction. , there was a problem of insufficient mixing with the surrounding low-temperature gas.
The present disclosure has been made to solve the above problems, and is closer to the arc area in the direction of flow of the insulating gas after being blown onto the arc, compared to the gas circuit breaker according to Patent Document 1. By arranging the stirring member on the upstream side of the gas, the stirring effect of promoting the mixing of the high temperature insulating gas and the surrounding low temperature gas is enhanced, and the efficiency of temperature averaging between the high temperature gas and the surrounding low temperature gas can be improved. Provide circuit breakers.

A gas circuit breaker according to the present disclosure includes a sealed container in which an insulating gas is sealed, a fixed arc contact and a movable arc contact provided in the sealed container and coaxially opposed to each other so as to be freely contactable and separated, and a movable arc contact. A gas blowing mechanism that blows insulating gas against the arc generated when the arc contactor and the fixed arc contactor are separated, an insulating nozzle arranged to surround the arc area where the arc is generated, and the flow direction of the insulating gas. , attached to a cooling cylinder that is arranged downstream from the insulating nozzle and cools the insulating gas blown onto the arc, and a tip that is the end of the insulating nozzle that extends to the cooling cylinder side, and controls the flow of the insulating gas. a stirring section including a separate stirring member.

According to the gas circuit breaker according to the present disclosure, the stirring part having the stirring member is attached to the tip of the insulating nozzle surrounding the arc area. Compared to the conventional technology, the stirring member is arranged on the upstream side closer to the arc area in the flow direction of the insulating gas after it is blown to the arc, so it promotes mixing of the high temperature insulating gas and the surrounding low temperature gas. To provide a gas circuit breaker capable of enhancing the stirring effect of heating and improving the efficiency of temperature averaging between high-temperature gas and surrounding low-temperature gas.

1 is a cross-sectional view showing a schematic configuration of a gas circuit breaker according to the present disclosure; FIG. 1 is a cross-sectional view showing a schematic configuration of an arc-extinguishing device in a gas circuit breaker according to Embodiment 1 of the present disclosure; FIG. FIG. 4 is a cross-sectional view showing the stirring part of the arc-extinguishing device in the gas circuit breaker according to Embodiment 1 of the present disclosure; FIG. 4 is a cross-sectional view showing a comparative example and a modification of the stirring part of the arc-extinguishing device in the gas circuit breaker according to Embodiment 1 of the present disclosure; FIG. 7 is a cross-sectional view showing the stirring part of the arc-extinguishing device in the gas circuit breaker according to Embodiment 2 of the present disclosure; FIG. 11 is a cross-sectional view showing a stirring portion of an arc-extinguishing device in a gas circuit breaker according to Embodiment 3 of the present disclosure; FIG. 11 is a cross-sectional view showing a stirring portion of an arc-extinguishing device in a gas circuit breaker according to Embodiment 4 of the present disclosure; FIG. 11 is a cross-sectional view showing a stirring portion of an arc-extinguishing device in a gas circuit breaker according to Embodiment 5 of the present disclosure;

Hereinafter, embodiments according to the present disclosure will be described with reference to the drawings. In addition, in each of the following embodiments, the same reference numerals are given to the same components.

Embodiment 1.
A gas circuit breaker according to Embodiment 1 will be described. FIG. 1 is a cross-sectional view showing a schematic configuration of a gas circuit breaker 100 according to the present disclosure.

As shown in FIG. 1 , the gas circuit breaker 100 has a sealed container 1 and a drive mechanism section 30 installed outside the sealed container 1 . The sealed container 1 is provided with a first bushing 32 that accommodates the first bushing conductor 31 and a second bushing 34 that accommodates the second bushing conductor 33 . The first bushing conductor 31 and the second bushing conductor 33 form part of a current circuit.

The closed container 1 contains an insulating gas that insulates the closed container 1 from the current circuit. Examples of the insulating gas include air, compressed air, sulfur hexafluoride (SF6), carbon dioxide (CO2), trifluoromethane iodide (CF3I), nitrogen (N2), oxygen (O2), methane tetrafluoride (CF4 ), argon (Ar), and helium (He), or a mixed gas in which at least two of these gases are mixed.

Inside the sealed container 1, there are an arc-extinguishing device 40 for extinguishing the arc generated when the current is interrupted, a rod 41 for transmitting driving force from the driving mechanism 30 to the movable portion of the arc-extinguishing device 40, and the arc-extinguishing device 40. A movable side shield 42 that covers the outer circumference of the movable portion is accommodated.
The movable shield 42 is electrically connected to the movable main contactor 7 and the movable arc contactor 6 to be described later via metal parts (not shown), and is similar to the movable main contactor 7 and the movable arc contactor 6. maintained at potential.

FIG. 2 is a sectional view showing the configuration of the arc-extinguishing device 40 of the gas circuit breaker according to this embodiment.
In FIG. 2, illustration of the movable side shield 42 is omitted.
In FIG. 2 and each figure described later, the x-axis, the y-axis and the z-axis are assumed to be three axes perpendicular to each other. In the following description, the x-axis direction represents the central axis 101 of the arc extinguishing device 40 . The y-direction represents, for example, the vertical up-down direction. FIG. 2 shows an xy section of the arc extinguishing device 40 . A direction parallel to the central axis 101 (horizontal direction in FIG. 2) is referred to as "axial direction", and a direction perpendicular to the axial direction is referred to as "radial direction". Directions around the axial direction are denoted as "circumferential".

As shown in FIG. 2, the arc extinguishing device 40 has a fixed main contact 8, a fixed arc contact 11, a movable main contact 7 and a movable arc contact 6. The fixed main contact 8 and the fixed arc contact 11 are fixed-side contacts in the gas circuit breaker 100 . The movable main contactor 7 and the movable arc contactor 6 are contactors on the movable side in the gas circuit breaker 100 .

Both the stationary main contact 8 and the stationary arc contact 11 are electrically connected to the second bushing conductor 33 shown in FIG. The stationary main contact 8 has, for example, a cylindrical shape. The fixed arc contact 11 has, for example, a rod-like shape. The respective central axes of the fixed main contact 8 and the fixed arc contact 11 are arranged coaxially and are the central axis 101 shown in FIG. The fixed main contact 8 and the fixed arc contact 11 are electrically connected to each other via metal parts (not shown) and maintained at the same potential.

Both the movable main contact 7 and the movable arc contact 6 are electrically connected to the first bushing conductor 31 shown in FIG. The respective center axes of the movable main contact 7 and the movable arc contact 6 are arranged coaxially with the center axis 101 of the fixed main contact 8 and the fixed arc contact 11 . The movable arc contact 6 is connected to the drive mechanism section 30 via the rod 41 shown in FIG. The movable main contactor 7 and the movable arc contactor 6 advance and retreat along the axial direction integrally with the puffer cylinder 3 and the insulating nozzle 9 described later by driving force transmitted through the rod 41 .

The movable main contact 7 has, for example, an annular shape that can come into contact with the inner peripheral surface of the fixed main contact 8 . In the state shown in FIG. 2 , the movable main contact 7 is separated from the stationary main contact 8 and electrically isolated from the stationary main contact 8 . That is, in the state shown in FIG. 2, the current circuit is open. When the movable main contact 7 moves rightward in FIG. 2, the movable main contact 7 comes into contact with the fixed main contact 8 and is electrically connected with the fixed main contact 8 . As a result, the current circuit is closed and turned on.

The stationary arc contact 11 and the movable arc contact 6 are electrically connectable and coaxially opposed to each other so as to be freely contactable and detachable. The movable arc contact 6 is axially driven to contact and separate from the fixed arc contact 11 .
The movable arc contact 6 has, for example, a cylindrical shape that can come into contact with the outer peripheral surface of the fixed arc contact 11 . In the state shown in FIG. 2 , the movable arc contact 6 is separated from the stationary arc contact 11 and electrically isolated from the stationary arc contact 11 . When the movable arc contact 6 moves rightward in FIG. 2, the movable arc contact 6 comes into contact with the fixed arc contact 11 and is electrically connected with the fixed arc contact 11 .

An arc is generated when the fixed arc contact 11 and the movable arc contact 6 are separated. A region where an arc is generated between the stationary arc contact 11 and the movable arc contact 6 is an arc region 13 shown in FIG. The arc extinguishing device 40 has a gas blowing mechanism 5 for blowing insulating gas onto the arc generated in the arc region 13 . The gas spraying mechanism 5 has at least a puffer cylinder 3 and a puffer piston 50 .

The puffer cylinder 3 is formed in a cylindrical shape with the rod 41 shown in FIG. 1 as its central axis. The puffer cylinder 3 is configured to be integrated with the movable main contactor 7 and the movable arc contactor 6 so as to advance and retreat along the axial direction. The puffer piston 50 is inserted inside the puffer cylinder 3 . The puffer piston 50 is fixed to the sealed container 1 using an insulating support member. The puffer piston 50 advances and retreats relative to the puffer cylinder 3 as the puffer cylinder 3 advances and retreats. A space surrounded by the puffer cylinder 3 and the puffer piston 50 is the puffer chamber 4 . The puffer chamber 4 contains an insulating gas enclosed in the sealed container 1 .

Furthermore, the arc extinguishing device 40 has a cooling cylinder 10 and an insulating nozzle 9 . The cooling cylinder 10 is configured to cool the insulating gas that has been blown to a high temperature by the arc and return the cooled insulating gas to the space inside the sealed container 1 . The cooling cylinder 10 is maintained at the same potential as the stationary main contact 8 and the stationary arc contact 11 . The insulating nozzle 9 is configured to guide the insulating gas sprayed onto the arc to the cooling cylinder 10, and has a tubular shape extending in the axial direction. The insulating nozzle 9 is made of an insulator. The insulating nozzle 9 is arranged so as to surround the outer circumferences of the movable arc contact 6 and the fixed arc contact 11 . Thereby, the arc area 13 is located inside the insulating nozzle 9 and the insulating nozzle 9 is arranged so as to surround the arc area 13 .

In this embodiment, the central axes of the stationary main contact 8, the stationary arc contact 11, the movable main contact 7, the movable arc contact 6, the puffer cylinder 3, the puffer piston 50, the insulating nozzle 9, and the cooling cylinder 10 are arranged coaxially, which is the central axis 101 shown in FIG.

In FIG. 2, the flow direction of the insulating gas that has been blown to the arc and heated to a high temperature is flow direction 2 indicated by an arrow. In the following, "upstream" and "downstream" mean upstream and downstream in the flow direction 2 of the insulating gas.
In general, the stationary arc contact 11 is rod-shaped and extends in the axial direction, and the insulating nozzle 9 is cylindrical and extends in the axial direction. In the vicinity of the stationary arc contact outer peripheral surface 111 , which is the outer peripheral surface of the stationary arc contact 11 , the flow direction 2 is parallel to the axial direction along the stationary arc contact outer peripheral surface 111 . As shown in FIG. 2, for example, the insulating nozzle 9 has an inner peripheral surface 91 formed with a tapered surface so that the inner diameter increases along the flow direction 2 of the insulating gas. ing. In this case, the insulating gas flow direction 2 near the inner peripheral surface of the insulating nozzle 9 is axially inclined along the insulating nozzle inner peripheral surface 91, but the axial component is the main component.

The high temperature insulating gas away from the arc area 13 in the insulating nozzle 9 flows into the cooling cylinder 10 arranged downstream from the insulating nozzle 9 and mixes with the original low temperature gas in the cooling cylinder 10 . An insulating gas flow path is formed from the insulating nozzle 9 to the cooling cylinder 10 . The insulating nozzle 9 has a tip portion 92 which is an end portion extending toward the cooling cylinder 10 side.

As shown in FIG. 2 , the agitator 12 is attached to the tip 92 of the insulating nozzle 9 . The stirring part 12 is arranged perpendicular to the axial direction.
FIG. 3 is a cross-sectional view showing stirring section 12 in gas circuit breaker 100 according to Embodiment 1. As shown in FIG. FIG. 3(a) is an enlarged view of a region E surrounded by a dashed line in FIG. FIG. 3A shows an xy cross section of the stirring unit 12. As shown in FIG. FIG. 3(b) shows a yz cross section of the stirring part 12 along line AA in FIG. 3(a).

As shown in FIG. 3, in the present embodiment, the stirring section 12 is attached to the tip section 92 perpendicularly to the axial direction. A yz cross section of the stirring part 12 perpendicular to the axial direction is a cross section perpendicular to the flow path of the insulating gas. The flow direction 2 of the insulating gas is the same as the axial direction, or the axial direction component is the main component, whereas the yz cross section of the stirring part 12 is regarded as a cross section perpendicular to the flow direction 2 . The stirring section 12 includes a stirring member having a cross section perpendicular to the flow direction 2 of the insulating gas so as to separate the flow of the insulating gas.

As shown in FIG. 3(b), the yz cross section of the stirring section 12 is a circular shape expanding in the radial direction. The stirring section 12 has a radially inner first stirring member 20 , a radially outer supporting member 22 , and a second stirring member 21 connecting the first stirring member 20 and the supporting member 22 . .

As described above, the insulating nozzle 9 has a tubular shape extending in the axial direction, and the support member 22 is arranged at the tip portion 92 . The first stirring member 20 is arranged radially inside the insulating nozzle 9 from the support member 22 . The support member 22 and the first stirring member 20 each extend in the circumferential direction and are formed in an annular shape. The second stirring member 21 is an arm radially extending in the radial direction from the first stirring member 20 to the supporting member 22 so as to connect the first stirring member 20 and the supporting member 22 .

The stirring part 12 has a stirring effect that promotes mixing of the high-temperature insulating gas and the surrounding low-temperature gas. The high-temperature and high-speed insulating gas advances in the flow direction 2, collides with the first stirring member 20 and the second stirring member 21 of the stirring section 12, and is separated. The flow of the insulating gas is changed by the stirring part 12 to generate a vortex. As the flow of insulating gas progresses downstream, the size of the vortex increases, and while being stirred by the vortex, it advances to the cooling cylinder 10 arranged downstream of the insulating nozzle 9 . In the cooling cylinder 10, the high-temperature insulating gas and the surrounding low-temperature gas are mixed, so the temperature of the high-temperature gas decreases. The first stirring member 20 and the second stirring member 21 are stirring members that separate the flow of the insulating gas, and function as gas flow stirring means that promotes mixing of the high-temperature insulating gas and the surrounding low-temperature gas. is.

Compared to the structure in which the stirring member is installed on the downstream side of the insulating nozzle in the conventional technology, by installing the stirring part 12 at the tip 92 of the insulating nozzle 9, the movable arc contact and the fixed arc contact Due to the distance, the stirring member does not move further away from the arc area, and the high temperature insulating gas can be quickly separated after blowing out the arc. Efficient temperature averaging.

In general, the tubular insulating nozzle 9 extending in the axial direction has a circular cross section perpendicular to the axial direction. A cross section perpendicular to the axial direction of the fixed arc contactor 11 is also circular. In this case, the cross section perpendicular to the axial direction of the region where the insulating gas flows fast in the insulating nozzle 9 is circular. In the present embodiment, in order to efficiently separate the flow of absolute gas, the cross section of the first stirring member 20 perpendicular to the axial direction is preferably circular. Moreover, corresponding to the shape of the insulating nozzle 9, the cross section perpendicular to the axial direction of the support member 22 installed at the tip portion 92 is preferably circular.

The purpose of the first stirring member 20 and the support member 22 is to stir the gas flow and to support the stirring member, respectively, and it is possible to realize their respective functions even if the cross-sectional shape is not circular. . The cross-sectional shape of the first stirring member 20 perpendicular to the axial direction may be, for example, a polygon such as a quadrangle, a pentagon, a hexagon, and an octagon. Since the first stirring member 20 has a cross section perpendicular to the flow direction 2 of the insulating gas, it collides with the high-temperature and high-speed insulating gas flow, so that the insulating gas flow is separated, and the high-temperature insulating gas and the surrounding low-temperature gas are separated. It has a stirring effect that promotes mixing with the gas. Further, the supporting member 22 may be intermittently formed in the circumferential direction so that it can be installed at the tip portion 92 of the insulating nozzle 9 to support the stirring member.

In addition, the support member 22 of the stirring section 12 shown in FIG. Specifically, the support member 22 is attached so as to cover the outer periphery of the tip portion 92 of the insulating nozzle 9 . The support member 22 has an inner diameter larger than the outer diameter of the tip portion 92 and includes a protruding portion 221 that protrudes toward the insulating nozzle 9 . This structure of the support member 22 increases the area covering the outer periphery of the insulating nozzle 9, improves the strength of attaching the stirring part 12 to the insulating nozzle 9, and simplifies assembly.

Although the supporting member 22 and the insulating nozzle 9 may be fastened with screws, a plate or the like may be inserted between the supporting member 22 and the insulating nozzle 9 to mediate the two.

Further, the first stirring member 20, the second stirring member 21, and the support member 22 may be integrally formed by casting for cost reduction, or may be manufactured as individual parts and screwed together. .

4(a) and (b) show the xy cross-sectional structures of the stirring units 12a and 12b as comparative examples of the stirring unit 12 shown in FIG.

The stirring portion 12a of Comparative Example 1 shown in FIG. 4A is attached to the tip portion 92 of the insulating nozzle 9. Installed covered. The support member 22 a has an outer diameter smaller than the inner diameter of the tip 92 and includes a projecting portion 222 projecting toward the insulating nozzle 9 .
Since the stirring portion 12a of Comparative Example 1 is also attached to the tip portion 92, the effect of stirring the insulating gas can be enhanced.

On the other hand, compared to the stirring part 12a of Comparative Example 1, the stirring part 12 in which the support member 22 shown in FIG. It is possible to reduce the pressure loss caused by giving resistance to the gas flow in the flow path.

Further, FIG. 4(b) shows, as Comparative Example 2, a stirring portion 12b having a second stirring member 21 fixed to the tip portion 92 of the insulating nozzle 9. As shown in FIG.

When attaching the stirring part 12b of Comparative Example 2, for example, by processing a notch for accommodating the second stirring member 21 in the insulating nozzle 9, the second stirring member 21 overlaps with the tip part 92 of the insulating nozzle 9, and is axially aligned. can be installed without protruding outside the insulating nozzle 9. In this case, the installation strength can be improved by fitting the stirring portion 12b and the insulating nozzle 9 together. In addition, in the stirring section 12b, the support member 22 may have, for example, a protrusion 221 that protrudes toward the insulating nozzle 9 so as to cover the outer periphery of the tip portion 92 of the insulating nozzle 9. As shown in FIG.
Since the stirring portion 12b of Comparative Example 2 is also attached to the tip portion 92, the effect of stirring the insulating gas can be enhanced.

On the other hand, in the case of Comparative Example 2, processing such as notching is required so that the insulating nozzle 9 and the stirring portion 12b are fitted. Therefore, compared with the stirring section 12b of Comparative Example 2, the stirring section 12 shown in FIG. 3 can be installed more easily, and the processing cost is low. 3 is located outside the insulating nozzle 9 in the axial direction, compared to the stirring portion 12b of Comparative Example 2, and therefore has less effect on the space inside the insulating nozzle 9. It is possible to reduce the pressure loss caused by giving resistance to the gas flow in the flow path.

FIG. 4(c) shows a stirring section 12c having a support member 22 fixed to the tip portion 92 of the insulating nozzle 9 as a modified example of the stirring section 12 shown in FIG.
When the stirring portion 12c is attached to the tip portion 92 of the insulating nozzle 9, for example, by flattening the axial surface of the tip portion 92 in contact with the support member 22, the gap between the insulating nozzle 9 and the stirring portion 12c is reduced. Mounting strength can be increased. The stirring part 12c of the modified example can also enhance the stirring effect of the insulating gas in the same manner as the stirring part 12 shown in FIG.

According to the gas circuit breaker according to Embodiment 1, the stirring part having the stirring member is arranged at the tip of the insulating nozzle arranged so as to surround the arc region where the arc is generated. In the flow direction of the insulating gas after it is blown onto the arc, compared to the conventional technology, the stirring member is arranged on the upstream side closer to the arc area, which promotes mixing of the high-temperature insulating gas with the surrounding low-temperature gas. To provide a gas circuit breaker capable of enhancing the stirring effect of heating and improving the efficiency of temperature averaging between high-temperature gas and surrounding low-temperature gas.

Embodiment 2.
In the second embodiment, the same reference numerals are used for the same components as in the first embodiment of the present disclosure, and the description of the same or corresponding parts is omitted. Hereinafter, the stirring section in the gas circuit breaker according to Embodiment 2 will be described with reference to the drawings.

FIG. 5 is a cross-sectional view showing the stirring section 12 in the gas circuit breaker according to Embodiment 2. FIG. FIG. 5( a ) shows the xy cross-sectional structure of the stirring section 12 . FIG. 5(b) shows a yz cross section of the stirring part 12 along line AA in FIG. 5(a).

The fixed arc contactor outer peripheral surface 111 and the insulating nozzle inner peripheral surface 91 face each other in the radial direction. In FIG. 5 , a center line 60 represents an extension line in the flow direction 2 of the radial center position of the fixed arc contactor outer peripheral surface 111 and the insulating nozzle inner peripheral surface 91 . In the radial direction, the distance from the center line 60 to the insulating nozzle inner peripheral surface 91 is the same as the distance from the center line 60 to the fixed arc contactor outer peripheral surface 111 .

As in the first embodiment, the stirring part 12 in the second embodiment is also arranged at the tip part 92 of the insulating nozzle 9 . Compared to the first embodiment, the first stirring member 20 is positioned on the center line 60 in the stirring section 12 according to the second embodiment. At least a portion of the first stirring member 20 is arranged on the centerline 60 .

The flow velocity distribution of the high-temperature, high-speed insulating gas varies depending on the location where the arc region 13 is generated and the shape of the insulating nozzle 9. Generally, between the fixed arc contact outer peripheral surface 111 and the insulating nozzle inner peripheral surface 91, The flow velocity of the insulating gas is the fastest near the center position in the radial direction. By arranging the first stirring member 20 on the extension line in the flow direction 2 of the central position where the flow velocity of the insulating gas is fast, the flow of the insulating gas can be separated more efficiently, forming a vortex and stirring. can promote effectiveness.

According to the gas circuit breaker according to Embodiment 2, compared to Embodiment 1, it is possible to further improve the stirring effect of promoting the mixing of the high-temperature insulating gas and the ambient low-temperature gas.

Embodiment 3
In the third embodiment, the same reference numerals are used for the same components as in the first embodiment of the present disclosure, and the description of the same or corresponding parts is omitted. Hereinafter, the stirring part in the gas circuit breaker according to Embodiment 3 will be described with reference to the drawings.

FIG. 6 is a cross-sectional view showing the stirring section 12 in the gas circuit breaker according to Embodiment 3. FIG. FIG. 6( a ) shows the xy cross-sectional structure of the stirring section 12 . FIG. 6(b) shows a yz cross section of the stirring part 12 along line AA in FIG. 6(a). 6(c) and 6(d) show xz cross sections of the second stirring member 21 along line BB in FIG. 6(b).

In the gas circuit breaker according to Embodiment 3, in the flow direction 2 of the insulating gas, at least one of the first stirring member 20 and the second stirring member 21 of the stirring section 12 has an upstream end that extends in the flow direction 2. has a cross-section forming an acute angle towards

Regarding the first stirring member 20 arranged near the fixed arc contact 11, as shown in FIG. A portion 201 forms an acute angle in the direction of flow 2 . That is, the upstream end of the first stirring member 20 is formed such that the width in the radial direction becomes smaller in the flow direction 2 . Since the first stirring member 20 has an annular cross-section perpendicular to the axial direction, the upstream end 201 of the first stirring member extending in the circumferential direction forms an acute angle toward the flow direction 2 .
The acute-angled first stirring member upstream end 201 of the first stirring member 20 can reduce the pressure loss caused by giving resistance to the gas flow at low cost.

As for the second stirring member 21, as shown in FIG. 6(b), the second stirring member 21 extends in the radial direction so as to connect the annular first stirring member 20 and the support member 22. there is In this case, as shown in FIG. 6C, in a cross section parallel to the axial direction, the upstream end 211 of the second stirring member 21, which is the upstream end of the second stirring member 21, faces the flow direction 2. form an acute angle. That is, the upstream end of the second stirring member 21 is formed such that the width in the circumferential direction becomes smaller in the flow direction 2 .
The acute-angled second stirring member upstream end 211 of the second stirring member 21 can reduce the pressure loss caused by providing resistance to the gas flow at low cost.

The flow direction 2 of the insulating gas is the same direction as the axial direction, or the component in the axial direction is the main component. At least one of the first stirring member 20 and the second stirring member 21 has a cross section parallel to the flow direction 2 in which the upstream end forms an acute angle in the flow direction 2 .

It should be noted that the second stirring member 21 shown in FIG. , the downstream end may have a second stirring member downstream end 213 forming an acute angle along the flow direction 2 . Thereby, the pressure loss caused by giving resistance to the gas flow can be reduced.
Similarly, for the first stirring member 20 , the downstream end facing the upstream end 201 of the first stirring member 20 may form an acute angle along the flow direction 2 .

In the stirring part 12 attached to the tip part 92 of the insulating nozzle 9, regardless of the acute angle shape of the downstream end of the stirring member, the insulating gas flows at a high speed, so that the stirring member generates a vortex, resulting in a high temperature. Mixing of the insulating gas with the ambient low temperature gas can be promoted.

According to the gas circuit breaker according to the third embodiment, as in the first embodiment, the stirring part attached to the tip of the insulating nozzle has a stirring effect of promoting mixing of the high-temperature insulating gas and the surrounding low-temperature gas. can be improved. Moreover, as compared with the first embodiment, the pressure loss caused by giving resistance to the gas flow can be reduced at a low cost.

Embodiment 4
In the fourth embodiment, the same reference numerals are used for the same components as in the first embodiment of the present disclosure, and the description of the same or corresponding parts is omitted. Hereinafter, the stirring part in the gas circuit breaker according to Embodiment 4 will be described with reference to the drawings.

FIG. 7 is a cross-sectional view showing the stirring section 12 in the gas circuit breaker according to Embodiment 4. FIG. FIG. 7 shows the xy cross-sectional structure of the stirring section 12 . In the stirring unit 12 shown in FIG. 7 , the outer peripheral diameter of the upstream end of the first stirring member 20 is indicated by the upstream outer peripheral diameter 24 , and the outer peripheral diameter of the downstream end is indicated by the downstream outer peripheral diameter 25 . For example, when the first stirring member 20 has a cylindrical shape extending in the flow direction 2, the upstream outer peripheral diameter 24 and the downstream outer peripheral diameter 25 are the diameters of the outer peripheral surfaces of the upstream end and the downstream end, respectively. be.

In the stirring portion 12 of the gas circuit breaker according to Embodiment 4, the downstream outer peripheral diameter 25 of the first stirring member 20 is larger than the upstream outer peripheral diameter 24 in the flow direction 2 of the insulating gas. As a result, as shown in FIG. 7, the flow direction 2 of the insulating gas spreads toward the outside of the insulating nozzle 9 in the flow direction 2a.
Compared to the first embodiment, the stirring unit 12 according to the third embodiment can further improve the stirring effect of promoting the mixing of the high-temperature insulating gas and the ambient low-temperature gas.

Embodiment 5
In Embodiment 5, the same reference numerals are used for the same components as in Embodiment 1 of the present disclosure, and the description of the same or corresponding parts is omitted. Hereinafter, the stirring part in the gas circuit breaker according to Embodiment 5 will be described with reference to the drawings.

FIGS. 8(a) and 8(b) are cross-sectional views respectively showing

stirring parts

12 and 12d in a gas circuit breaker according to Embodiment 5. FIG. 8(a) and 8(b) show the yz cross-sectional structures of the stirring

portions

12 and 12d. The yz cross section of the stirring section is regarded as a cross section perpendicular to the flow direction 2 of the insulating gas, and FIGS.

In the stirring section 12 of the gas circuit breaker according to Embodiment 5, the circumferential width of the second stirring member 21 is smaller than the radial width of the first stirring member 20 in the cross section perpendicular to the flow direction 2 .

In the stirring unit 12 shown in FIG. 8(a), the first stirring member 20 is annular extending in the circumferential direction, and the second stirring member 21 extends from the first stirring member 20 to the support member 22 in the axial direction. It extends radially. Due to this structure, the first stirring member 20 has a higher stirring effect for the insulating gas than the second stirring member 21 does. The second stirring member 21 is a connecting part that connects the first stirring member 20 and the support member 22, and is preferably thin as long as the strength permits. As shown in FIG. 8A, the second stirring member width 26, which is the width of the second stirring member 21 in the circumferential direction, is larger than the first stirring member width 27, which is the width of the first stirring member 20 in the radial direction. small. Thereby, the pressure loss caused by giving resistance to the gas flow can be reduced.

In the stirring portion 12d shown in FIG. 8(b), the second stirring member width 26 of the second stirring member 21 is smaller than the first stirring member width 27 of the first stirring member 20. ), the number of the second stirring members 21 of the stirring portion 12d shown in FIG. 8B is smaller than that of the stirring portion 12 shown in FIG. It is preferable to reduce the number of second stirring members 21 as connecting parts as long as the strength permits to reduce the pressure loss when the gas flows.

Further, for example, by reducing the proportion of the total cross-sectional area of the second stirring member 21 relative to the proportion of the cross-sectional area of the first stirring member 20 in the cross section perpendicular to the flow direction 2, the resistance to the gas flow can be reduced. It is also possible to reduce the pressure loss caused by the application.

According to the gas circuit breaker according to the fifth embodiment, as in the first embodiment, the stirring part attached to the tip of the insulating nozzle has a stirring effect of promoting mixing of the high-temperature insulating gas and the surrounding low-temperature gas. can be improved. Moreover, in the fifth embodiment, by reducing the width, the number, or the cross-sectional area of the second stirring members as compared with the first embodiment, the pressure loss caused by the resistance to the gas flow can be reduced.

Note that the configurations shown in the above embodiments are examples of the content of the present disclosure, and can be combined with other known techniques. It is also possible to omit or change part of

1 Closed container, 2 Flow direction, 3 Puffer cylinder, 4 Puffer chamber, 5 Gas spraying mechanism, 6 Movable arc contact, 7 Movable main contact, 8 Fixed main contact, 9 Insulated nozzle, 91 Insulated nozzle inner peripheral surface , 92 tip, 10 cooling cylinder, 11 fixed arc contact, 111 fixed arc contact outer peripheral surface, 12, 12a, 12b, 12c, 12d stirring part, 13 arc area, 20 first stirring member, 21 second stirring member , 22 support member, 201, first stirring member upstream end, 211 second stirring member upstream end, 212, 213 second stirring member downstream end, 24 upstream outer diameter, 25 downstream outer peripheral diameter, 26 Second stirring member width 27 First stirring member width 30 Drive mechanism part 31 First bushing conductor 32 First bushing 33 Second bushing conductor 34 Second bushing 40 Arc extinguishing device 41 Rod 42 Movable side shield, 50 puffer piston, 100 gas circuit breaker

Claims

a closed container containing an insulating gas;
A fixed arc contact and a movable arc contact provided in the sealed container and coaxially opposed to each other so as to be freely contactable and detachable;
a gas blowing mechanism for blowing the insulating gas against an arc generated when the movable arc contact and the fixed arc contact are separated;
an insulating nozzle arranged to surround an arc region where the arc is generated;
a cooling cylinder arranged downstream of the insulating nozzle in the flow direction of the insulating gas and cooling the insulating gas sprayed onto the arc;
a stirring section including a stirring member attached to a tip portion that is an end portion of the insulating nozzle extending toward the cooling cylinder and separating the flow of the insulating gas;
gas circuit breaker.
The insulating nozzle has a tubular shape,
The stirring part is
a support member disposed at the distal end;
a first stirring member disposed radially inside the insulating nozzle from the support member and extending in the circumferential direction;
a second stirring member connecting the first stirring member and the supporting member;
2. The gas circuit breaker according to claim 1, wherein said first stirring member and said second stirring member are said stirring members.
The gas circuit breaker according to claim 2, wherein the support member is arranged on the outer peripheral side of the insulating nozzle.
The first stirring member is
4. The arc contact according to claim 2, which is positioned on an extension line in the flow direction of the insulating gas from the center position in the radial direction between the outer peripheral surface of the fixed arc contact and the inner peripheral surface of the insulating nozzle. gas circuit breaker.
At least one of the first stirring member and the second stirring member has a cross section in which an upstream end portion forms an acute angle toward the flow direction of the insulating gas. 5. The gas circuit breaker according to any one of 4.
The gas circuit breaker according to any one of claims 2 to 5, wherein the outer peripheral diameter of the first stirring member on the downstream side is larger than that on the upstream side in the flow direction of the insulating gas.
said second stirring member radially extending from said first stirring member to said support member;
7. Any one of claims 2 to 6, wherein the width of the second stirring member in the circumferential direction is smaller than the width of the first stirring member in the radial direction in a cross section perpendicular to the flow direction of the insulating gas. A gas circuit breaker according to the paragraph.