circuit breaker

Abstract

The invention relates to a circuit breaker (1) comprising at least two contacts (3, 3.1, 4, 4.1), at least one of the at least two contacts (3, 3.1, 4, 4.1) being movable and there being an arc region (5) between the at least two contacts (3, 3.1, 4, 4.1), at least one exhaust (8, 9) which is in fluid connection with the arc region (5) and comprises an outlet (12) for discharging insulation gas, and a gas mixing structure (20) which is installed on a gas flow path between the arc region (5) and the outlet (12), the gas mixing structure (20) comprising a static mixer (40) which forms a plurality of gas channels (41, 42), the plurality of gas channels (41, 42) being arranged at least sectionally and / or partially obliquely to one another and being configured to mix the insulation gas passing through the plurality of gas channels (41, 42).

Description

Technical Field

[0001] The present invention relates to a circuit breaker comprising at least two contacts, at least one of the at least two contacts being movable and having an arc region between the at least two contacts, and the circuit breaker comprising at least one venting portion fluidly connected to the arc region for insulating gas. Background Technology

[0002] Various types of electrical systems, such as circuit breakers, remain areas of interest. Some existing systems have various drawbacks, defects, and disadvantages relative to certain applications. For example, in some gas-insulated circuit breakers, their construction and / or electrical performance can be improved to achieve better reliability. Additionally, cost optimization is needed. Therefore, further contributions are still required in this technological field.

[0003] An electric arc is generated during the operation of a circuit breaker. The high temperature of the arc heats the gas or insulating gas inside the circuit breaker, which can then be guided away from the contacts and the arc area through the vent. Managing the hot gas is a problem. In particular, continuous improvement of the circuit breaker is an issue, especially regarding its lifespan and wear, particularly for components in direct contact with the hot gas.

[0004] US 2007 / 068904 A1 describes a circuit breaker having means for splitting thermal quenching gas into two partial gas streams.

[0005] US 3,448,231 A describes a circuit breaker having an arc-extinguishing section and an arc-limiting assembly.

[0006] US 2,615,109 A describes arc-limiting elements suitable for suppressing flashover from circuit breakers, and further describes nested, spaced-apart zigzag magnetic elements to provide multiple heat-absorbing zigzag channels.

[0007] US 5,403,983 A describes an arc-extinguishing device for a circuit breaker, wherein arc-extinguishing plates are supported on an insulating body member, and wherein a space is formed between the arc-extinguishing plates.

[0008] JP 2021 039912 A describes a gas circuit breaker and a gas guiding unit having multiple orifices for discharging high-temperature gas.

[0009] DE 10 40 103 B describes a cleaning plug for electrical switchgear.

[0010] DE 102 47 378 A1 describes an arc-extinguishing device for a switching device. Summary of the Invention

[0011] The object of this invention is to provide a solution for a circuit breaker that offers improved maintenance, reduced costs, and increased lifespan. In particular, it aims to avoid or reduce the disadvantages of existing solutions.

[0012] The objective of this invention is achieved through the features of the independent claims. Preferred embodiments are described in detail in the dependent claims, the specification, and the drawings.

[0013] The objective is achieved in particular by a circuit breaker, for example a circuit breaker configured as a medium-voltage circuit breaker and / or a high-voltage circuit breaker, the circuit breaker comprising: At least two contacts, at least one of which is movable, and an arcing region is present between the at least two contacts; At least one exhaust section, said at least one exhaust section being fluidly connected to the arc region and including an outlet for discharging insulating gas; and A gas mixing structure is installed on the gas flow path between the electric arc region and the outlet; wherein... The gas mixing structure includes a static mixer that forms a plurality of, particularly elongated, gas channels, which are arranged at least partially and / or partially at an angle to each other and configured to mix the insulating gas passing through the plurality of gas channels.

[0014] Specifically, the static mixer comprises a series of stacked metal sheets that form the plurality of gas channels, and, Each of the sheets includes a shape that is periodically repeated in translational direction along the planar direction of the sheet to form the plurality of gas channels.

[0015] In other words, specifically, a gas-insulated circuit breaker is proposed, having two or more contacts and an exhaust section for guiding insulating gas away from the electric arc, particularly away from the arc region. A static mixer is arranged in the exhaust section, configured to mix the insulating gas flowing through the exhaust section along the main flow direction. The static mixer forms a complex and / or non-parallel path structure for the insulating gas to flow through it, thereby at least partially rearranging the insulating gas and providing a mixing effect.

[0016] For example, a static mixer comprises stacked metal plates that form a path structure, the metal plates having a repeating shape along their extension direction, which helps to form the path structure.

[0017] The existing technology may at least not describe: The static mixer comprises a series of stacked metal sheets, each sheet comprising a shape that is periodically repeated in translational direction along the plane of the sheet to form the plurality of gas channels.

[0018] The present invention provides that the insulating gas flow can be redistributed and uniformly mixed when passing through the gas mixing structure, and can achieve rapid cooling of the insulating gas; therefore, its lifespan can be increased.

[0019] US 3,448,231 A describes a series of metal plates with a large number of holes. The holes of adjacent plates are staggered or interleaved, so there is no continuous straight path for gas. The metal plates of US 3,448,231 A do not have a shape that repeats periodically in translation. The pattern of the metal plates does not repeat periodically in translation.

[0020] US 2,615,109 A describes multiple nested and spaced zigzag magnetic components, the zigzag shape being substantially irregular. In US 2,615,109 A, the pattern of the zigzag magnetic components does not repeat periodically with translation.

[0021] DE 102 47 378 A1 describes an arc-extinguishing device for a low-voltage switchgear, comprising arc-extinguishing plates assembled into a stack, the stack being arranged at intervals between lateral retainers. DE 102 47 378 A1 relates to an arc-extinguishing device and indicates that the device is arranged within an arc region, implying that it is not located between an outlet and the arc region. DE 102 47 378 A1 does not describe a circuit breaker having two contacts, one of which is movable, and an arc region between the two contacts, a vent in fluid communication with the arc region, and including an outlet for discharging insulating gas, and a gas mixing structure installed between the arc region and the outlet. DE 102 47 378 A1 particularly does not describe a plurality of gas channels arranged at least partially and / or partially at an angle to each other, configured to mix insulating gases passing through the plurality of gas channels.

[0022] In general, in the absence of corresponding inspiration and the solution itself is not obvious, the prior art does not make the following solution obvious: to provide a gas mixer by creating gas channels through stacked metal sheets and by means of the periodic shape of the sheets.

[0023] This invention recognizes that thermally insulating gas from the arc region can be rapidly cooled by first mixing it with a cooler insulating gas in a gas mixing structure, and secondly by transferring heat to the gas mixing structure. This invention is based on the concept that the thermally insulating gas is not simply guided towards the outlet along a substantially straight or elongated path, but rather along a complex path structure or labyrinthine structure within a static mixer, where the channels essentially provide mixing and / or partial rearrangement of the gas flow.

[0024] This invention not only enables the mixing of thermally insulating gases with other thermally insulating gases, but also, particularly, enables the mixing of thermally insulating gases with coldly insulating gases. Thermally insulating gas streams and coldly insulating gas streams, especially parallel gas streams, can be mixed in a static mixer. For example, a thermally insulating gas stream originating from the arc region and located in the middle of the exhaust section can be cooled by mixing with a coldly insulating gas stream in a circumferential region, for example, closer to the surface or wall of the exhaust section. The coldly insulating gas can already be present in the circuit breaker before operation, or, particularly in the case of the thermally insulating gas, can be drawn in together with the thermally insulating gas stream. This invention provides that a higher volume of coldly insulating gas stream can be mixed with a relatively lower volume of thermally insulating gas stream. A potentially larger volume of colder gas can be mixed with a potentially smaller volume of hot gas. Therefore, the average temperature of the insulating gas leaving the outlet can be reduced by this invention.

[0025] Static mixers, particularly paths or gas channels, are configured to facilitate secondary lateral flow of insulating gas, which enhances the transfer of mass and heat in cross sections, for example, transverse to the main flow direction of the insulating gas.

[0026] This invention is based on the concept that in a circuit breaker, a high-energy gas (e.g., a gas with high pressure and / or high temperature) can be blown toward an arc between at least two contacts (e.g., arc contacts), or simply "the contacts" or "the two contacts," which forms between the contacts once they separate during circuit breaker operation. The hot gas can be generated primarily by evaporation of a portion of the circuit breaker, for example by evaporation of a nozzle surrounding the arc region, which typically separates the arc contacts in an insulating manner. During contact separation, a portion of the gas can fill an upstream volume where the gas accumulates under high pressure, and typically at least a portion of the gas flows downstream to at least one exhaust section, where the invention has found that the gas can weaken the dielectric recovery performance of the circuit breaker. This can lead to discharge between the contacts and, optionally, flashover to the metal housing in the case of a metal-enclosed circuit breaker. The hot gas from the arc region can reduce the dielectric strength in at least one exhaust section, for example, adjacent to the housing and / or contacts, due to the high temperature and also due to carrying metal particles. This invention provides improvements in reducing gas temperature and potentially reducing the number of particles in the gas.

[0027] This invention can provide a delay in the output of hot gas from at least one exhaust section. The arrival of the gas at the fluid volume defined by the circuit breaker's interruptor and its housing or enclosure is particularly delayed. The temperature of the hot gas leaving at least one exhaust section can be reduced. Furthermore, the dust content in the insulating gas leaving at least one exhaust section can be minimized.

[0028] In particular, the present invention provides a solution for rapidly reducing the temperature of insulating gas by means of a device implemented in the exhaust section, without the need for complex re-establishment of circuit breakers.

[0029] The present invention also provides a scheme in which solid particles or dust from hot gas can be separated in a gas mixing structure due to the inertial force applied to the flow through the inclined channel. The gas mixing structure can be used as a particulate filter.

[0030] This invention significantly reduces the occurrence of dielectric breakdown, for example, reducing dielectric breakdown toward the casing of metal-enclosed circuit breakers, particularly high-voltage circuit breakers (HVCBs). This is achieved by drastically reducing the temperature of the gas leaving the circuit breaker and reducing the dust carried by this gas. The reduction in temperature and dust content significantly improves the overall dielectric strength of the circuit breaker.

[0031] By means of the present invention and the aspects described herein, an improved circuit breaker that can be more easily manufactured / produced can be provided. Since the use of a gas mixing structure reduces the temperature in a smaller space compared to not using a gas mixing structure, the size of the component can be reduced. The effects and advantages described herein can be further improved by employing preferred features or combinations thereof.

[0032] Circuit breakers are preferably configured for medium-voltage and / or high-voltage switching applications. Circuit breakers can be used to interrupt rated current as well as current caused by electrical faults. Circuit breakers may need to be able to carry high rated currents from 3000 A to 6300 A and switch very high short-circuit currents from 31.5 kA to 80 kA at high voltages of 72.5 kV, particularly up to 1200 kV. The term "medium voltage" can refer to voltages from 1 kV to 72.5 kV, and the term "high voltage" can refer to voltages greater than 72.5 kV. The term "high voltage" preferably refers to voltages above 12 kV, 36 kV, 72 kV, or 1100 kV. High voltage preferably refers to rated voltages in the range from 12 kV, 36 kV, or 72 kV to 550 kV or 1100 kV, such as 145 kV, 245 kV, or 420 kV or higher. The term "medium voltage" preferably refers to a voltage higher than 1 kV, or higher than 12 kV, or higher than 36 kV. Medium voltage preferably refers to rated voltages from above 1 kV, 12 kV, or 36 kV to 72 kV, such as 5 kV, 10 kV, 25 kV, or 70 kV.

[0033] High-voltage or medium-voltage installations and / or switchgear, especially circuit breakers, are essential for the protection of technical equipment, particularly in the medium- or high-voltage range. For example, circuit breakers are primarily used to interrupt current in the event of an electrical fault. As an example, to prevent current flow even under conditions of high potential originating from the electrical fault itself, circuit breakers have the function of disconnecting arcing contacts, extinguishing the arc, and keeping the arcing contacts separated from each other. Circuit breakers can be configured as pneumatic circuit breakers, self-energized circuit breakers, or a combination of pneumatic and self-energized circuit breakers.

[0034] A circuit breaker may have two or more contacts, i.e., at least two contacts. For readability, the phrase "at least" is mostly omitted, although when discussing "contacts," it usually refers to "at least two contacts."

[0035] One or two contacts of a circuit breaker, particularly arcing contacts, are arranged to be movable, especially along the switch axis. The contacts mentioned herein can be arcing contacts. The circuit breaker may also have corresponding rated contacts. The contacts or contacts may extend at least partially along the switch axis. A contact may be fixed relative to the housing, but may also be arranged to be movable along the switch axis. One or more contacts can typically take a closed position, signifying that an electrical connection is established or connected, and an open position, signifying that an electrical connection is interrupted or disconnected. Typically, at least one contact is movable along the switch axis between the closed and open positions. For example, operating a circuit breaker, especially an interrupting circuit breaker, means that the contact moves rapidly from the closed position to the open position.

[0036] The circuit breaker may have a housing, enclosure, and / or casing, preferably configured to be hermetically sealed and / or include a tubular or cylindrical shape extending along the switching axis. The circuit breaker may be a metal-enclosed and / or three-pole circuit breaker, particularly a high-voltage circuit breaker (HVCB). An electrically operated drive unit may be provided and / or a drive unit disposed outside the casing may be provided. The drive unit may be configured to move one or both contacts. In this embodiment, the drive unit may be connected to a contact, for example, via a lever.

[0037] When a circuit breaker is operated, an electric arc may form in the arc region. The arc heats its surroundings, such as the insulating gas and contacts, as well as other components of the circuit breaker, such as nozzles. This causes the gas near the arc region to expand, resulting in the gas automatically moving away from the arc region into the exhaust section, and preferably moving to the outlet at least at one point. During operation, the gas may also be mechanically propelled through the circuit breaker and / or away from the arc region into the exhaust section, and preferably moving to the outlet at at least one point. The circuit breaker may have a gas compression device to mechanically move the insulating gas within the circuit breaker, for example, configured to be actuated during operation of the circuit breaker. During operation, the insulating gas passing through or flowing through the exhaust section may be a mixture of hot gas originating from the arc region and cold gas originating from a region away from the arc region.

[0038] In other words, specifically, during the opening or closing process of a circuit breaker, an arc is formed between two contacts, or at least two contacts, particularly the arcing contacts. To interrupt the current, circuit breakers typically contain insulating gas within the housing and / or enclosure, serving as an insulating and / or dielectric medium (e.g., SF6 gas, CO2 gas, or C4FN gas) and for extinguishing the arc. Therefore, a portion of the insulating gas in the arc-generating region, referred to as the arc-extinguishing volume and / or arc zone, is substantially heated for a very short period. This portion of gas / fluid is pressurized and can be injected from the arc-extinguishing volume into a so-called exhaust volume (at least one exhaust section) to be preferably discharged at an outlet. Here, the present invention can be applied to enhance the circuit breaker's ability to cool the insulating gas more quickly and / or within a smaller space.

[0039] The arc zone or area is typically surrounded by an insulating nozzle. The nozzle is also typically used to guide the flow of insulating gas to extinguish or blow out the arc. Therefore, the insulating gas is usually guided by a dedicated channel, also known as a heating channel, within the nozzle that terminates near the arc zone. Thus, the insulating gas can be directly guided onto the forming arc to be further guided towards the exhaust section while still hot, where it mixes with the cold insulating gas and is discharged, for example, into a housing or enclosure. In other words, specifically, the hot insulating gas from the arc zone can escape towards an exhaust section or exhaust volume specifically located at the end of the circuit breaker. The insulating gas is then cooled by mixing with the cold insulating gas, and can be released through an outlet into one of the circuit breaker's housings or enclosures.

[0040] Insulating gases are commonly used in circuit breakers to insulate conductors from other components and / or to improve arc extinguishing during circuit breaker operation. In particular, insulating gases are used to extinguish arcs that form in the arc region between contacts during current interruption, and are therefore also called arc-extinguishing gases. Preferably, the insulating gas comprises SF6, CO2, O2, N2, C4FN, and / or CF4, especially mixtures thereof, and / or contains organic fluorine compounds selected from the group consisting of: fluoroethers (especially hydrofluoromonoethers), fluoroamines, fluoroethylene oxides, fluoroketones (especially perfluoroketones), fluoroolefins (especially hydrofluoroolefins), fluoronitriles (especially perfluoronitriles), and mixtures of the above compounds (especially mixtures mixed with a background gas). The insulating gas and / or dielectric insulating medium can be any suitable gas capable of adequately extinguishing the arc formed between contact elements during current interruption operation, such as, but not limited to, inert gases, such as sulfur hexafluoride (SF6) or carbon dioxide (CO2). The insulating gas can be based on CO2, meaning it can include CO2 and other gaseous components such as SF6, CF4, O2, N2, and / or C4FN. Specifically, the insulating gas used can be any dielectric insulating medium and / or insulating gas, which can be a gas and / or a liquid, and particularly can be a dielectric insulating gas or an arc-quenching gas. Such a dielectric insulating medium and / or insulating gas can, for example, include a medium containing an organic fluorine compound selected from the group consisting of: fluoroethers, ethylene oxide, fluoroamines, fluoroketones, fluoroolefins, fluoronitriles, and mixtures thereof and / or decomposition products. The insulating gas and / or dielectric insulating medium can be selected from the group consisting of: hydrofluoroethers, perfluoroketones, hydrofluoroolefins, perfluoronitriles, and mixtures thereof.

[0041] The circuit breaker may have at least one vent that is fluidly connected to the arc region. To achieve this fluid connection, the at least one vent may be arranged to receive insulating gas from the arc region, for example, coupled to the arc region in terms of fluid transport. The at least one vent includes an outlet for discharging the insulating gas. The outlet may not always be open; for example, it may open or close depending on the movement of the contacts, particularly being closed in the closed position and / or open in the open position. The outlet may include one or more orifices, for example, connecting the vent volume to the interior of the housing. An vent may be arranged at one end of the circuit breaker, for example, on an axial side of a contact opposite the arc region. There may be two vents, for example, one vent per contact. The at least one vent may receive insulating gas originating from the arc region and is particularly configured to guide the insulating gas through a gas mixing structure, particularly through at least one static mixer in that gas mixing structure. The at least one vent is typically used to treat and cool the insulating gas flow present during operation of the circuit breaker. The insulating gas may flow into the at least one vent on one or both axial sides of the arc region, particularly into one or more of the vents therein.

[0042] A gas mixing structure means that it includes one or more static mixers. A gas mixing structure can be arranged in one or more exhaust sections. A gas mixing structure relates to (all) static mixers included in a circuit breaker, or to static mixers included in an exhaust section.

[0043] A static mixer forms multiple paths, channels, or gas passages. Gas passages can be configured to extend from one side of the static mixer to the other, for example, along the main flow direction between the arc region and the outlet, particularly in at least one exhaust section. Multiple gas passages can include two or more, particularly five, ten, twenty, or more. In principle, each gas passage or gas path can be configured to redirect a portion of the mainstream of the insulating gas away from the arc region. Gas passages can be configured as multiple pipes or rods arranged at an angle within the static mixer. A static mixer can be configured by fixing multiple components, such as rods, pipes, sheets, etc., to each other, for example, each component providing one or more gas passages.

[0044] In particular, the gas channel can be substantially and / or partially elongated. Therefore, the gas channel can have a length significantly greater than its width. The gas channel can be substantially and / or partially elongated along one direction, for example, its length along one direction is two, four, eight, or more times longer than in the two directions perpendicular to that direction.

[0045] The gas passage can have two ends, specifically opposing ends, one end of which may be close to the arc region and the other end of which may be far from the arc region. The ends can be arranged on opposite sides of the static mixer. The two ends can be arranged spaced apart from each other with respect to the main flow direction and / or the extension of the gas flow path between the arc region and the outlet. The two ends can also be arranged spaced apart from each other in a direction perpendicular to the main flow direction. In other words, for example, the gas passage can be substantially inclined relative to the main flow direction and / or can provide lateral displacement for the gas flowing through the gas passage. The two ends can provide for the rearrangement of individual portions of the gas flow, for example, providing a secondary lateral flow of insulating gas. Considering the presence of multiple gas passages, overall mixing of the gas flow can be achieved.

[0046] Gas channels are arranged at least partially and / or partially inclined to each other. For example, two of the multiple gas channels can direct the gas in different directions, such that a gas mixing effect can be achieved as the gas passes through and / or exits the multiple gas channels. A static mixer is specifically configured to mix in the absence of moving parts that provide the mixing effect, hence the name "static". A static mixer can include a pipe or passage having a specific, particularly static or fixed geometry that can influence the flow structure in a manner that promotes lateral flow, enhancing mass and heat transfer in the flow within a cross-section. A static mixer can be an insert-type construction, for example, comprising a series of identical fixed inserts, called elements, which can be installed in a pipe, passage, or conduit, particularly in at least one exhaust section. These elements can form gas channels. The purpose of the elements and / or channels can be to redistribute the fluid in directions inclined to or perpendicular to the main flow, such as radial and tangential directions. A static mixer can be configured to redistribute streamlines primarily or solely using the pumping energy of the flowing fluid in a sequential manner.

[0047] The gas mixing structure installed on the gas flow path between the arc region and the outlet preferably involves a static mixer that is fastened or fixed in and / or near at least one exhaust section.

[0048] A static mixer may include a series of stationary elements within a cylindrical tube or pipe. These stationary elements may be baffles or other shapes capable of continuously diverting and recombining gas passing through the static mixer. The stationary elements can be used to provide gas passageways. As gas moves through a series of these stationary elements, it may be repeatedly diverted, expanded, compressed, and redirected, facilitating the mixing process of hot and cold gases.

[0049] Preferably, the gas mixing structure, particularly one or more static mixers or at least one of them, is arranged to span the entire cross-section of at least one exhaust section. The gas mixing structure may substantially occupy at least one exhaust section, such that the insulating gas passing through at least one exhaust section must pass through and / or flow through the gas mixing structure, particularly at least one static mixer within the gas mixing structure. Specifically, this is provided to force the insulating gas from the arc region through multiple gas channels. This ensures mixing of the insulating gas for faster cooling and minimal bypassing.

[0050] Multiple gas channels have one or more first gas channels and one or more second gas channels. The first gas channels may be substantially parallel to each other. The second gas channels may be substantially parallel to each other. Specifically, the first and second gas channels may be arranged at least partially at an angle to each other and / or at an angle relative to each other. The first and / or second gas channels may be at least partially straight and / or curved. Specifically, the first and second gas channels may intersect each other, for example, at one or more locations or sections along the length of the channels, for example, laterally, to provide gas exchange between adjacent channels. The static mixer can thus be configured for cross-flow mixing, pairwise splitting, and / or back-mixing. In this way, a consistent mixing effect can be achieved throughout each static mixer, which has been found advantageous for rapidly cooling insulating gases in circuit breakers. The insulating gas can be thermally homogenized by the static mixer, for example, to reduce the peak temperature in the gas flow.

[0051] A static mixer may comprise a series of stacked sheets, particularly metal sheets, forming multiple gas channels. Each stacked sheet may form a first gas channel, a second gas channel, or both. The sheets are preferably made of bent and / or shaped metal. For example, the sheets may be made of aluminum or steel. The sheets may be corrugated and / or grooved to form multiple gas channels. The sheets may have a repeating shape in cross-section. The sheets in a series of stacked sheets may be connected to each other. For example, adjacent sheets may be bonded and / or welded together. This construction ensures a long lifespan for the static mixer because rapid temperature changes during its use have little effect on the structure.

[0052] The stacked sheets in this series can have at least four, and particularly eight or more, sheets. The more sheets used, the more channels can be formed, and the mixing effects can be designed accordingly. In addition, the channels can be formed in more complex ways to enhance the gas mixing effect.

[0053] The sheet preferably comprises a thickness or plate thickness of at least 0.5 mm, at least 1.0 mm, or at least 2.0 mm or greater. Alternatively or additionally, the sheet thickness may be up to 3.0 mm, up to 4.0 mm, or up to 5 mm. In particular, the thickness may be 2.25 mm ± 1.5 mm. The thickness may be at least substantially constant in the direction of extension of the sheet. However, in some areas, such as in areas where the sheets are fixed to each other or where the sheets are fixed to at least one vent, the thickness may be smaller or larger. The thickness may be considered an average value. This thickness may follow the deformation of the sheet, such as if it is bent, shaped, ripped, and / or grooved. In this way, the gas mixing effect can be effectively adjusted.

[0054] The sheets can be stacked along their normal direction at a spacing of at least 1 mm, at least 2.5 mm, at least 5 mm, or at least 7.5 mm. Alternatively or additionally, the spacing of the stacked sheets / the spacing said to be the maximum can be 5 mm, at most 7.5 mm, at most 10 mm, at most 12.5 mm, or at most 15 mm. The spacing can be 8 mm ± 3 mm. In particular, the spacing can be 7.7 mm ± 10%. This spacing can be at least substantially constant in the direction of extension of the stacked sheets. However, in some areas, such as in fixed areas, the spacing can be smaller or larger. The spacing can be considered as an average value. The spacing can be considered from the lowest point to the lowest point or the highest point to the highest point of two adjacent sheets. In this way, the gas mixing effect can be effectively adjusted.

[0055] Specifically, each sheet may include a shape that periodically repeats itself along the planar direction of the sheet to form multiple gas channels. This shape may be herringbone. The herringbone shape may have increasing segments, a top bend, a decreasing segment, and a bottom bend connecting two adjacent segments. The bottom bend may connect to the next increasing segment, and the pattern may repeat along the planar direction. The thickness may be substantially constant throughout the herringbone shape. The spacing can be considered from the bottom bend of the sheet to the adjacent bottom bend of the adjacent sheet. Therefore, the herringbone shape may include multiple grooves.

[0056] The top bend and / or bottom bend may be defined by a recessed inner surface having a radius of at least 0.5 mm and / or less than 5 mm. The radius may be 1.5 mm ± 0.5 mm. The top bend and bottom bend may have similar or identical shapes and are arranged on opposite sides of the sheet. Two adjacent sheets may be connected via bottom bends and top bends facing each other. Two adjacent sheets may form point contact by multiple points of contact with each other via top bends and bottom bends.

[0057] The sheet material may include a camber defined by the distance between the bottom and top bends in the normal direction of the sheet. The camber can be considered as the depth of a groove formed in a herringbone shape. The sheets may be stacked such that the spacing is less than, equal to, or greater than the camber. Specifically, a camber equal to the spacing would cause the sheets to contact each other. Alternatively or additionally, the camber may be at least 1 mm, at least 2.5 mm, at least 5 mm, or at least 7.5 mm. Alternatively or additionally, the camber may be at most 5 mm, at most 7.5 mm, at most 10 mm, at most 12.5 mm, or at most 15 mm. The camber may be 8 mm ± 3 mm. Specifically, the camber may be 7.7 mm ± 10%. Specifically, the camber may be substantially the same as the spacing. Therefore, channels that are effective in gas mixing can be formed.

[0058] The sheet material may include a bending angle between the increasing section and the planar direction. The sheet material may also include a bending angle between the decreasing section and the planar direction. The bending angle can be greater than 0°, greater than 5°, greater than 10°, greater than 20°, or greater than 30°. The bending angle can be less than 90°, less than 85°, less than 70°, less than 50°, or less than 40°. Specifically, the bending angle can be 35° ± 15°. In this way, multiple sheets can be arranged in a small space to form numerous channels.

[0059] The sheets can be stacked along their normal direction, with at least one sheet oriented at an angle between 0° and 90° relative to adjacent sheets around the normal direction, such that channels in the plurality of gas channels are tilted relative to each other. This angle can be greater than 0°, greater than 5°, greater than 10°, greater than 20°, or greater than 30°. The angle can also be less than 90°, less than 85°, less than 70°, less than 50°, or less than 40°. In particular, the angle can be 35° ± 15°. Therefore, channels that are effective in gas mixing can be formed.

[0060] The static mixer can have a substantially cylindrical shape with an average diameter of at least 20 mm, at least 50 mm, at least 75 mm, or at least 100 mm. The average diameter of the static mixer can be at most 75 mm, at most 100 mm, at most 200 mm, at most 300 mm, or at most 500 mm. The static mixer can have a substantially elliptical shape with an average diameter of at least 20 mm and / or at most 500 mm. The static mixer can have a substantially triangular, substantially rectangular, or substantially square shape. In particular, the shape of the static mixer can correspond to the surface of at least one exhaust section, especially the inner surface and / or concave surface. At least one exhaust section can include the average diameter as described above. The average diameter of at least one exhaust section and / or the static mixer can be 132 mm ± 30 mm.

[0061] The shape of the static mixer can have a length of at least 10 mm, at least 20 mm, or at least 100 mm. The length of the static mixer shape can be up to 50 mm, up to 100 mm, or up to 150 mm. Specifically, the length can be 40 mm ± 10%. The length can be considered along the switching axis of the circuit breaker and / or along the extension direction of at least one vent. The ratio between the length and the average diameter can be at least 0.05 and / or at most 3.

[0062] The gas mixing structure may include two, three, or more static mixers configured to be arranged adjacent to each other in the exhaust chamber of the circuit breaker, particularly in at least one exhaust section, spaced apart from or in contact with each other. The static mixers may be connected to each other to form structural units, for example, fixed relative to each other. Furthermore, to improve lifespan, the static mixers may be configured as structural units, for example, having an internal structure that holds the static mixer itself and / or all gas passages together.

[0063] Static mixers, such as two or more, can be configured to be oriented substantially parallel to each other, particularly at an angle greater than 0° and / or less than 180° about the extension direction of the switch axis and / or at least one exhaust section. This angle can be 90° ± 15°. Preferably, the angle is measured between planes defined by a stack of sheets of the corresponding static mixers, which preferably extend in a planar direction. In other words, in particular, the static mixers can be placed side-by-side and slightly rotated relative to each other, thus rotating in different ways. This enhances the gas mixing effect. The effect can be improved by spacing the static mixers apart, with a distance greater than 0 mm and / or less than 100 mm, particularly greater than 2 mm and / or less than 50 mm.

[0064] Furthermore, the above objective is achieved by using a gas mixing structure, such as the gas mixing structure described herein, which includes a static mixer forming a plurality of gas channels arranged at an angle to each other and configured to mix insulating gases, wherein the gas mixing structure is used to mix insulating gases in a circuit breaker, in a gas flow path between the arc region and the outlet of at least one exhaust section of the circuit breaker.

[0065] Throughout this disclosure, the term "or" may be replaced by "and / or". Therefore, the use of "or" does not necessarily mean that only alternatives are listed.

[0066] A circuit breaker is disclosed, for example, the circuit breaker is configured as a medium-voltage circuit breaker and / or a high-voltage circuit breaker, the circuit breaker comprising: At least two contacts, at least one of which is movable, and an arcing region is present between the at least two contacts; At least one exhaust section, said at least one exhaust section being fluidly connected to the arc region, and including an outlet for discharging insulating gas; and A gas mixing structure is installed on the gas flow path between the electric arc region and the outlet, wherein... The gas mixing structure includes a static mixer that forms a plurality of, particularly elongated, gas channels, which are arranged at least partially and / or partially at an angle to each other and configured to mix the insulating gas passing through the plurality of gas channels. Attached Figure Description

[0067] These and other aspects of the invention will become apparent and be elucidated through the embodiments described below.

[0068] In the attached diagram: Figure 1 The circuit breaker is shown in a schematic diagram; Figure 2 Another circuit breaker is shown in the schematic diagram; Figure 3 A static mixer is illustrated in schematic form, showing the flow of insulating gas through the gas passage of the static mixer; Figure 4 The gas mixing structure for the circuit breaker is shown in perspective view; Figure 5 Shown in front view Figure 4 Gas mixing structure; Figure 6 A top view shows the process of forming Figure 4 Sheets with gas-mixed structures; and Figure 7 The arrangement of the two sheets used to form the gas mixing structure is shown in a front view. Detailed Implementation

[0069] In describing the structural features of this invention, this document includes aspects of processes or methods; the structural features can be well understood in this way. It should be emphasized that such structural features can be extracted from the described context without hesitation or intermediate generalization, thus forming various aspects of the invention. It should also be emphasized that any structural feature described below can be understood as a separate aspect of the invention, distinguishing it from known solutions, although these structural features may be extracted from the context.

[0070] Figure 1A medium-voltage circuit breaker 1 is shown, comprising a gas compression device 2 and two contacts 3, 4, wherein the contact 4 is movable along a switching axis 10 and has an arc region 5 between the two contacts 3, 4, in which an arc may form during operation. The circuit breaker 1 contains an insulating gas, for example, a gas comprising at least C4FN. The arc region 5 is confined by a nozzle 7 configured to surround the contact 4 and the arc and guide the insulating gas. The circuit breaker 1 has an exhaust section 8 with an outlet 12 on one side of the contact 3 and an exhaust section 9 with an outlet 12 on one side of the contact 4. Both exhaust sections 8 and 9 are configured to be fluidly connected to the arc region 5 and have their outlets 12 to discharge the insulating gas from exhaust volume 8.1 or exhaust volume 9.1 to a housing (not shown), respectively.

[0071] A gas mixing structure 20 is installed in the exhaust section 9. The gas mixing structure 20 is arranged on the gas flow path between the arc region 5 and the outlet 12, especially on the side of the contact 4, which is a pin contact and / or a movable contact.

[0072] The gas mixing structure 20 includes a static mixer 40 that forms a plurality of gas channels 41, 42. The gas channels 41, 42 are arranged at an angle to each other and configured to mix insulating gases passing through and / or flowing through the gas channels 41, 42. Heated or hot insulating gases originating from the arc region 5 are automatically passed through the static mixer 40, which spans the entire cross-section of the exhaust section 9, i.e., along the inner surface 11 of the exhaust section 9, so that the gases are forced through the gas channels 41, 42.

[0073] Figure 2 A high-voltage circuit breaker 1 is shown, having a gas compression device 2 and including two contacts 3 and 4, wherein one or both of the contacts 3 and 4 are movable along a switch axis 10, and an arcing region 5 is present between the two contacts 3 and 4, in which an arc may form during operation. The presence of an arc is shown, where the circuit breaker is being operated and the insulating gas actively moves away from the arcing region 5. Contacts 3 and 4 are arcing contacts. In addition to the two contacts 3 and 4, the circuit breaker 1 also has additional contacts 3.1 and 4.1. Contacts 3.1 and 4.1 are provided as rated contacts.

[0074] Circuit breaker 1 contains an insulating gas, such as a gas comprising at least CO2. An arc region 5 is confined by a nozzle 7 configured to ablate by the arc and arranged to surround the contact 4 and the arc, guiding the insulating gas. Circuit breaker 1 has an exhaust section 8 with an outlet 12 on one side of the contact 3 and an exhaust section 9 with an outlet 12 on one side of the contact 4. Both exhaust sections 8 and 9 are configured to be fluidly connected to the arc region 5 and have their outlets 12 to discharge the insulating gas from exhaust volume 8.1 or exhaust volume 9.1 into a metal housing 13, respectively.

[0075] Gas mixing structures 20 are installed in exhaust sections 8 and 9, arranged along the gas flow path between the arc region 5 and the outlet 12. Each gas mixing structure 20 includes a static mixer 40 forming a plurality of gas channels 41, 42, which are arranged obliquely to each other and configured to mix the insulating gas passing through and / or flowing through the gas channels 41, 42. Therefore, heated or hot insulating gas originating from the arc region 5 automatically passes through the static mixer 40 in both exhaust sections 8 and 9 or on both sides of the arc region 5, the static mixer 40 spanning the corresponding inner surface 11 of the exhaust section 8 or 9, forcing the gas through the plurality of gas channels 41, 42.

[0076] exist Figure 1 and Figure 2 For example, the static mixer 40 comprises a series of stacked metal sheets extending along a planar direction Z, which is substantially parallel to the switch axis 10. Arrows extending in the corresponding circuit breaker 1 indicate the path of the insulating gas leaving the arc region 5.

[0077] Figure 3 The function of the static mixer 40, through which gas can pass, is shown. Figure 3The diagram illustrates the flow of an insulating gas in a conduit, flowing from left to right into a static mixer 40 arranged within the conduit. Specifically, the static mixer 40 extends along length H within the conduit and crosses the entire cross-section of the conduit transversely to length H, the diameter or width of which is referenced as D. The static mixer 40 has multiple elongated gas channels 41, 42 along length H, in this case inclined to the length rather than parallel to it. The conduit may be an exhaust section. Before entering the static mixer 40, the flow of the insulating gas throughout the cross-section of the conduit involves different temperature levels. Here, the core section of the flow is hotter than the surrounding section, indicated by arrows, with dashed lines around the arrows suggesting the core section. The core section may originate from an arc region, while the surrounding section may be gas initially contained within the conduit or the exhaust section. Upon entering the static mixer 40, each individual arrow or flow is redirected depending on whether it enters channel 41 or channel 42. Channel 41 travels in one direction (downward in this example), and channel 42 travels in a different incline (upward in this example). Specifically, channels 41 and 42 intersect each other laterally at multiple locations along length H, causing all sections of the airflow to mix with each other, resulting in an airflow with the greatest temperature reduction. Therefore, cross-flow mixing can be achieved. The (first) gas channel 41 is substantially parallel to each other, and the (second) gas channel 42 is substantially parallel to each other. Here, the first gas channel 41 and the second gas channel 42 are inclined relative to each other. Furthermore, particles can be filtered by the static mixer 40. Unlike the primarily turbulent flow, a stream is formed that pushes from bottom to top and in the opposite direction, thus laterally mixing the flow.

[0078] Figure 4 A gas mixing structure 20 is shown, comprising two static mixers 40 forming a plurality of gas channels 41, 42 arranged at an angle to each other and configured to mix insulating gases passing through the gas channels 41, 42. The two static mixers 40 are substantially identical or similar in shape and / or components. The length H of the static mixer 40 is 40 mm.

[0079] Figure 5 Shown in front view Figure 4 One of the static mixers 40. The gas mixing structure 20 is configured to span the entire cross-section of at least one exhaust section 8, 9 of the circuit breaker, so that insulating gas from the arc region is forced through a plurality of gas channels 41, 42. The plurality of gas channels 41, 42 have a first gas channel 41 parallel to each other and a second gas channel 42 parallel to each other, the first gas channel 41 and the second gas channel 42 being inclined to each other, wherein the first gas channel and the second gas channel intersect each other laterally at at least one location along their extension direction.

[0080] refer to Figure 4 and Figure 5 Each static mixer 40 includes a series of stacked metal sheets 44 forming a plurality of gas channels 41, 42, each stacked metal sheet 44 forming a first gas channel 41 or a second gas channel 42, wherein the sheet 44 is made of bent metal. In each static mixer 40, adjacent sheets 44 are bonded and / or welded together. Adjacent sheets 44 are directly stacked to each other through point contact. The sheets 44 have a thickness of 1.7 mm. The sheets 44 are stacked along the normal direction Y of the sheets 44 at a spacing h of 7.7 mm.

[0081] Each sheet 44 includes a shape that periodically repeats itself in translational direction X, Z along the planar directions of the sheet 44 to form multiple gas channels 41, 42. This shape is herringbone. The static mixer 40 has a substantially cylindrical shape with an average diameter D of 132 mm. Figure 5 The ratio between the length H of the static mixer 40 and the average diameter D is at least 0.05 and at most 3.

[0082] The two static mixers 40 are oriented substantially parallel to each other and rotated between 0° and 180° around the switching axis 10 and the planar axis 10, with the angle θ being measured between the planes defined by the stacked sheets 44 of the corresponding static mixers 40. Here, the angle θ is 90°.

[0083] Figure 6 Two sheets 44 are shown for forming or manufacturing a static mixer, for example Figure 4 and Figure 5 One of the static mixers. It is shown how two adjacent sheets 44 can be arranged to provide a plurality of gas channels 41, 42 tilted relative to each other. The sheets 44 are stacked along their normal direction Y, with one sheet 44 oriented at an angle β relative to the adjacent sheet 44 about the normal direction Y, such that channels 41, 42 of the plurality of gas channels 41, 42 are tilted relative to each other. Here, the angle β is 35° ± 15°.

[0084] Figure 7 Two adjacent sheets 44 are shown in cross-section. These sheets 44 can be used to form or manufacture a static mixer, for example... Figure 4 and Figure 5One of the static mixers. Sheet 44 includes a thickness s of 2.25 mm ± 1.5 mm, for example 1.7 mm. Sheets 44 are stacked at a spacing h along the normal direction Y of sheet 44. Each sheet 44 has a shape that periodically repeats itself in translation along the planar direction X of sheet 44 to form a plurality of gas channels 41, 42, the shape being a herringbone shape having an increasing segment 51, a top bend 52, a decreasing segment 53, and a bottom bend 54, and the bends 51, 52 connecting two adjacent segments 51, 53. The top bend 52 and the bottom bend 54 are defined by a recessed inner surface with a radius R of 1.5 mm. Sheet 44 includes a camber b, which is defined by the distance between the bottom bend 54 and the top bend 52 in the normal direction Y of sheet 44, wherein the sheets 44 are stacked such that the spacing h is greater than the camber b. Here, the camber b is 7.7 mm, with the spacing h being larger.

[0085] The sheet 44 includes a bending angle α between the gradually increasing section and the planar direction X. Here, the bending angle α is 35°.

[0086] Figure 7 Other relevant dimensions depicted are c, d, and L. Specifically, they depend on the dimension thickness s, the bending angle α, the camber b, and the radius R through the following relationships: Reference Figure 5 Sheets 44 are arranged along the normal direction Y or y-axis at a distance h from each other. (Reference) Figure 6 Sheets 44 are stacked, with each sheet oriented at an angle β relative to the adjacent layer about the normal direction. The layer spacing h should be such that h > b or h = b. However, an arrangement where h < b, resulting in material interpenetration and / or gas channels 41, 42 intersecting along their respective extension directions, is also an option (not shown). Angle β, or the relative layer angle, is a parameter used to control pressure loss through the static mixer, particularly through gas channels 41, 42.

[0087] Figure 4 and Figure 5 The static mixer 40 may be implemented in a cylindrical exhaust volume having an average diameter D. The number N of metal sheets in the static mixer 40 is preferably related to the diameter of the corresponding exhaust section. The spacing h and thickness s can follow the relationship D=N(h+s).

[0088] The ratio of length H to diameter D, i.e., H / D, affects the mixing performance of the static mixer 40. Good gas mixing, especially efficient gas mixing, can likely be achieved by placing a pair of static mixers 40 sequentially without gaps between them. However, as... Figure 4As shown, it is also possible to design static mixers 40 that do not contact each other.

[0089] like Figure 4 As shown, the two static mixers 40 can be arranged around the plane direction Z or z axis at a relative angle θ to enhance the gas mixing effect.

[0090] In such Figures 4 to 7 Following the development and physical verification of the design of the sheet 44 for the static mixer 40 shown, the following individual scopes were established to hopefully enhance the technical effects and advantages described herein. These scopes may be applied individually or in combination with each other.

[0091] • The thickness s can be between 0.5 mm and 5 mm, for example 1.7 mm ± 10%.

[0092] • The bending angle α can be between 5° and 85°, for example, 35° ± 10%.

[0093] • The ratio of camber b to thickness s, b / s, can be between 0.1 and 150.

[0094] • The ratio of radius R to thickness s, R / s, can be between 0.1 and 150.

[0095] • The ratio h / s of the spacing h to the thickness s can be between 0.1 and 150.

[0096] • The bending angle β can be between 5° and 85°, for example, 35° ± 10%.

[0097] • The ratio of length H to diameter D, H / D, can be between 0.05 and 3.

[0098] • The diameter D of at least one exhaust section and / or static mixer can be between 5 mm and 350 mm, for example 132 mm ± 10%.

[0099] • The angle θ between two consecutive mixing elements can be between 5° and 85°, or it can be 90° ± 10%.

[0100] • The number of static mixers connected in series, especially within an exhaust section, can be between 1 and 4, for example, 2.

[0101] like Figure 1 or Figure 2As shown, the use of the gas mixing structure 20 is illustrated and described. The gas mixing structure 20 includes a static mixer 40 forming a plurality of gas channels 41, 42, which are arranged at an angle to each other and configured to mix insulating gases. The gas mixing structure 20 is used to mix the insulating gases of the circuit breaker 1 in the gas flow path between the arc region 5 of the circuit breaker 1 and the outlet 12 of at least one exhaust section 8, 9.

[0102] List of reference numerals 1. Circuit breaker 2. Gas compression device 3 contacts 3.1 Contacts 4 contacts 4.1 Contacts 5. Arc Region 7 Nozzles 8. Exhaust section 8.1 Exhaust volume 9. Exhaust section 9.1 Exhaust volume 10 Switch axis 11 Surface 12 Exports 13. Outer shell 20 Gas Mixing Structure 40 Static Mixer 41 Gas Channel 42 Gas Channel 44 sheets 51 Gradual Increase Section 52 Top bend 53 Gradual Decrease Section 54 Bottom bend b. Arch (sheet material) D Diameter (Static Mixer) h-pitch (sheet material) H Length (Static Mixer) R radius (sheet material) S represents thickness (sheet material) α angle β angle θ angle X-plane direction Y normal direction Z-plane direction

Claims

1. A circuit breaker (1), comprising: At least two contacts (3, 3.1, 4, 4.1), at least one of the at least two contacts (3, 3.1, 4, 4.1) is movable, and there is an arc region (5) between the at least two contacts (3, 3.1, 4, 4.1). At least one exhaust section (8, 9), said at least one exhaust section (8, 9) being fluidly connected to the arc region (5) and including an outlet (12) for discharging insulating gas; and A gas mixing structure (20) is installed on the gas flow path between the arc region (5) and the outlet (12); wherein, The gas mixing structure (20) includes a static mixer (40) forming a plurality of gas channels (41, 42), the plurality of gas channels (41, 42) being arranged at least partially and / or partially at an angle to each other and configured to mix the insulating gas passing through the plurality of gas channels (41, 42), and, The static mixer (40) comprises a series of stacked metal sheets (44), wherein each sheet (44) comprises a shape that is periodically repeated in translation along the planar direction (X, Z) of the sheet (44) to form the plurality of gas channels (41, 42).

2. The circuit breaker (1) according to the preceding claim, characterized in that, The gas mixing structure (20) is arranged across the entire cross-section of the at least one exhaust section (8, 9) so that the insulating gas from the arc region (5) is forced through the plurality of gas channels (41, 42).

3. The circuit breaker (1) according to any one of the preceding claims, characterized in that, The plurality of gas channels (41, 42) have a first gas channel (41) that is substantially parallel to each other and a second gas channel (42) that is substantially parallel to each other, the first gas channel (41) and the second gas channel (42) being inclined to each other, wherein the first gas channel and the second gas channel intersect each other.

4. The circuit breaker (1) according to any one of the preceding claims, characterized in that, Each stack of metal sheets (44) forms a first gas channel (41) or a second gas channel (42), wherein the sheets (44) are made of bent and / or shaped metal.

5. The circuit breaker (1) according to the preceding claim, characterized in that, Adjacent sheets (44) are bonded and / or welded together.

6. The circuit breaker (1) according to any one of the preceding two claims, characterized in that, The series has at least four, in particular eight or more of the sheets (44).

7. The circuit breaker (1) according to any one of the preceding three claims, characterized in that, The sheet (44) has a thickness (s) of at least 0.5 mm and at most 5 mm, particularly a thickness (s) of 2.25 mm ± 1.5 mm.

8. The circuit breaker (1) according to any one of the preceding four claims, characterized in that, The sheet (44) is stacked along the normal direction (Y) of the sheet (44) at a spacing (h) of at least 1 mm and at most 15 mm, particularly the spacing (h) of 8 mm ± 3 mm.

9. The circuit breaker (1) according to any one of the preceding five claims, characterized in that, The sheet (44) is shaped as a herringbone with a gradually increasing section (51), a top bend (52), a gradually decreasing section (53) and a bottom bend (54), wherein the bends (51, 52) connect two adjacent sections (51, 53).

10. The circuit breaker (1) according to the preceding claim, characterized in that, The top bend (52) and / or the bottom bend (54) are defined by a recessed inner surface having a radius (R) of at least 0.5 mm and less than 5 mm, and in particular, the radius (R) is 1.5 mm ± 0.5 mm.

11. The circuit breaker (1) according to any one of the preceding two claims, characterized in that, The sheet (44) includes a camber (b) defined by the distance between the bottom bend (54) and the top bend (52) in the normal direction (Y) of the sheet (44), and in particular, the sheet (44) is stacked such that the spacing (h) is equal to or greater than the camber (b).

12. The circuit breaker (1) according to the preceding claim, characterized in that, The sheet (44) includes a bending angle (α) between the increasing section and the planar direction (X, Z), the bending angle (α) being greater than 0° and / or less than 90°, particularly at least 5° and at most 85°, especially 35° ± 15°.

13. The circuit breaker (1) according to any one of the preceding two claims, characterized in that, The sheets (44) are stacked along the normal direction / Y of the sheets (44), wherein at least one sheet (44) is oriented relative to the adjacent sheet (44) around the normal direction (Y) at an angle (β) between 0° and 90°, such that the channels of the plurality of gas channels (41, 42) are tilted relative to each other, in particular the angle (β) is at least 5° and at most 85°, especially the angle (β) is 35° ± 15°.

14. The circuit breaker (1) according to any one of the preceding claims, characterized in that, The static mixer (40) has the following shape, including: A basic cylindrical shape having an average diameter (D) of at least 20 mm and at most 500 mm, or a basic ellipse having an average diameter (D) of at least 20 mm and at most 500 mm, or a basic triangle, a basic rectangle, or a basic square, the shape corresponding to the surface (11) of the at least one exhaust portion (8, 9).

15. The circuit breaker (1) according to the preceding claim, characterized in that, The shape of the static mixer (40) includes: A length (H) of at least 10 mm and at most 150 mm along the switch axis (10), wherein the ratio between the length (H) and the average diameter (D) is at least 0.05 and at most 3.

16. The circuit breaker (1) according to any one of the preceding claims, characterized in that, Includes two, three or more of the static mixers (40), which are arranged adjacent to each other in the exhaust chamber of the circuit breaker (1), spaced apart from each other or in contact with each other, and in particular the static mixers (40) are connected to each other to form a structural unit.

17. The circuit breaker (1) according to the preceding claim, characterized in that, The two or more static mixers (40) are configured to be oriented substantially parallel to each other and to be oriented about the switch axis / the switch axis (10) at an angle (θ) greater than 0° and less than 180°, in particular 90° ± 15°, wherein the angle (θ) is measured between the planes defined by the stacked sheets (44) of the corresponding static mixers (40).

18. Use of a gas mixing structure (20) comprising a static mixer (40) forming a plurality of gas channels (41, 42), the plurality of gas channels (41, 42) being arranged obliquely to each other and configured to mix insulating gases, wherein, The gas mixing structure (20) is used to mix the insulating gas in the circuit breaker (1) in the gas flow path between the arc region (5) of the circuit breaker (1) and the outlet (12) of at least one exhaust section (8, 9).

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