An arc extinguishing chamber of a circuit breaker

Abstract

The present invention relates to an arc extinguishing chamber of a circuit breaker. The arc extinguishing chamber of the circuit breaker includes an air guide cone and a static support coaxially arranged relative to a central axis. The static support is a cylindrical structure. The inner cavity of the static support forms an air compression chamber. The air guide cone is provided with an air guide surface facing the air compression chamber. The air guide surface is a rotating surface with the central axis as the rotation center. The air guide surface is used to guide the hot air flow flowing onto the air guide cone. The air guide cone and the static support are spaced apart to form a flow port. The air guide cone has a conical portion protruding toward the static support. The outer surface of the tip of the conical portion is a spherical crown. A conical surface is provided around the tip of the conical portion on the conical portion. The conical surface is tangent to the spherical crown. A plane is provided around the conical portion on the air guide cone. An arc transition surface is provided between the plane and the conical surface. The spherical crown, the conical surface, the arc transition surface and the plane jointly form the air guide surface, which can significantly reduce the overall temperature of the gas in the arc extinguishing chamber, reduce the temperature quickly, and effectively improve the heat dissipation capacity.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to an arc extinguishing chamber of a circuit breaker. Background Art

[0002] In the event of a short circuit at a certain point in the power grid, the circuit breaker is the final link in the power system's protection chain and the only means of safeguarding the grid. Therefore, circuit breakers must meet extremely high standards for operational reliability. High-voltage circuit breakers are primarily used to close, carry, and interrupt circuit currents, and are crucial to the safe operation of power lines. In power plants and substations, high-voltage circuit breakers are used for both control and protection, playing a vital role in the safe and stable operation of the power system and are an indispensable component. With the rapid development of my country's power industry, power transmission and transformation levels are constantly improving, and the operating performance and quality requirements of electrical products are becoming increasingly stringent. High-voltage SF6 circuit breakers, as the leading high-voltage switchgear, play a vital control and protection role in high-voltage, extra-high-voltage, and ultra-high-voltage transmission systems, ensuring that other electrical equipment in the power system is not damaged, thereby ensuring safe, reliable, and stable operation of electricity.

[0003] During the short-circuit current interruption process of high-voltage SF6 circuit breakers, thermal breakdown often occurs. The excessively high temperature in the arc extinguishing chamber is the main reason for the reduction in dielectric insulation performance. To avoid excessively high temperature in the arc extinguishing chamber, it is necessary to quickly discharge the hot gas that reduces the SF6 gas density due to the arc between the fractures, and continuously strengthen the cooling of the gas at the post-arc breaking position. In order to discharge the hot air flow, a corresponding air flow channel is provided in the arc extinguishing chamber for the high-temperature and high-pressure gas at the fracture to be discharged along the air flow channel. In order to ensure smooth gas flow, a gas guide cone is provided in the air flow channel to guide and redirect the air flow. The basic structure of this arc extinguishing chamber is as follows: Figure 1As shown, the arc extinguishing chamber includes a gas guide cone 1, a compressed air chamber 3, a static support 4, a gas shield 2, a static arc contact 6, and a nozzle 7. The arc extinguishing chamber includes a central axis, the static arc contact is located on the central axis, the static arc contact is separated and combined with the corresponding moving arc contact in the nozzle, the static support is a cylinder with an inner cavity, the static support is for installing the static arc contact, the axis of the static support coincides with the central axis, the inner cavity of the static support forms a compressed air chamber, the gas guide cone is arranged on the side of the static support away from the nozzle, the gas guide cone is a rotating body with the central axis as the rotation center, and the side of the gas guide cone facing the compressed air chamber is provided with an annular groove, The axis of the annular groove coincides with the central axis. The groove wall of the annular groove forms an air guide surface. The groove wall of the annular groove is a smooth curved surface and has an outer groove wall surrounding the central axis. The outer edge of the annular groove is opposite the end face of the static support and is spaced apart to form a flow port. The end of the air guide cone facing away from the static support is fixed to an air shield. The air shield is disposed around the outer periphery of the air guide cone and the static support, forming an annular space between the air shield and the outer periphery of the static support. The end of the static support away from the air guide cone is provided with a shield. The shield and the outer periphery of the static support form an annular groove facing away from the nozzle, and the air shield extends into the annular groove. When the static arc contact and the moving arc contact are separated and combined, high-temperature and high-pressure gas generated at the fracture enters the compressed air chamber, is guided by the air guide surface of the air guide cone, enters the gap between the air shield and the static support through the flow port, flows into the annular groove between the shield and the static support, and is discharged from the gap between the air shield and the shield.

[0004] Because the shape of the gas guide cone affects gas flow, which in turn affects heat dissipation, its design is crucial. While the gas guide cones in existing arc extinguishing chambers can guide gas flow to a certain extent, in practice, they are insufficient to enhance airflow smoothness and fail to meet the demand for high heat dissipation rates in the airflow channel. This is especially true as industry development places increasingly stringent demands on electrical products, rendering the heat dissipation capabilities of existing arc extinguishing chambers insufficient. Summary of the Invention

[0005] The object of the present invention is to provide an arc extinguishing chamber of a circuit breaker to solve the problem of low heat dissipation capacity of the arc extinguishing chamber of the existing circuit breaker.

[0006] The technical solution of the arc extinguishing chamber of the circuit breaker of the present invention is:

[0007] A circuit breaker arc extinguishing chamber includes an air guide cone and a static support coaxially arranged relative to a central axis, the static support is a cylindrical structure, the inner cavity of the static support forms a compressed air chamber, the air guide cone is provided with an air guide surface facing the compressed air chamber, the air guide surface is a rotating surface with the central axis as the center of rotation, the air guide surface is used to guide the hot air flow flowing onto the air guide cone, the air guide cone and the static support are spaced apart to form a flow port between the air guide cone and the static support, the air guide cone has a tapered portion protruding toward the static support, the outer surface of the tip of the tapered portion is a spherical crown, a tapered surface is provided around the tip of the tapered portion on the air guide cone, the tapered surface is tangent to the spherical crown, a plane is provided around the tapered portion on the air guide cone, an arc transition surface is provided between the plane and the tapered surface, the spherical crown, the tapered surface, the arc transition surface, and the plane together form the air guide surface.

[0008] Beneficial effect: By protruding a conical portion on the plane and setting the tip surface of the conical portion into a spherical crown, the spherical crown, the conical surface, the arc transition surface and the plane are smoothly matched to form a gas guide surface. The gas guide surface of this shape can make the air flow channel in the arc extinguishing chamber smoother. Simulation analysis has proved that the use of a gas guide cone with a gas guide surface of this shape can significantly reduce the overall temperature of the gas in the arc extinguishing chamber compared to the existing gas guide cone, and the temperature drops quickly, which effectively improves the heat dissipation capacity.

[0009] Furthermore, the tapered portion extends into the compressed air chamber.

[0010] Beneficial effect: extending the conical portion into the compressed air chamber is beneficial to guiding the hot air flow.

[0011] Furthermore, the static support has a rear end surface facing the air guide cone, with the direction perpendicular to the central axis as the radial direction, and the middle of the conical surface of the conical portion in the extension direction of the central axis corresponds to the rear end surface of the static support in the radial direction.

[0012] Beneficial effect: The end of the static support is aligned with the middle of the conical surface in radial direction, which is beneficial for the rapid passage of hot air flow.

[0013] Furthermore, the plane is located at the rear side of the static support and is opposite to the rear end surface of the static support in the front and back direction, and the annular gap between the plane and the rear end surface of the static support forms the flow port.

[0014] Beneficial effect: In this way, a radially outward flow opening can be formed between the air guide cone and the static support to allow air to pass smoothly.

[0015] Furthermore, it also includes an air shield, which is arranged on the outer periphery of the static support. The inner peripheral surface of the air shield is spaced apart from the outer peripheral surface of the static support to form an annular flow channel between the air shield and the static support. The annular flow channel is connected to the flow port. The end of the air shield close to the air guide cone is fixed on the air guide cone, and the plane is connected to the inner peripheral surface of the air shield.

[0016] Beneficial effect: The plane is connected to the inner peripheral surface of the air shield, which is conducive to making the air flow channel smooth and increasing the gas flow speed.

[0017] Furthermore, an end surface of the air shield close to the air guide cone is connected to the plane.

[0018] Beneficial effects: It is convenient to seal and fix the air shield and the air guide cone, and helps to avoid the generation of a gap between the inner circumference of the air shield and the air guide cone to affect the gas flow.

[0019] Furthermore, a compression chamber flow channel for hot air flow is provided in the compression chamber, and two connecting ports are provided between the compression chamber flow channel and the annular space flow channel, and the two connecting ports are arranged at intervals along the extension direction of the central axis; a vent for hot air flow is provided in the middle part of the static support in the extension direction of the central axis, and the vent is correspondingly connected with the middle part of the annular space flow channel; the vent and the flow port constitute two connecting ports.

[0020] Beneficial effect: By opening an air vent in the middle of the static support, two connecting holes, the air vent in the middle and the flow port at the end, are formed between the compression chamber flow channel and the annular space flow channel. Part of the hot air flow will first enter the annular space flow channel from the air vent in the middle, and the other part will flow through the air guide cone at the end and enter the annular space flow channel from the flow port at the end. In this way, the air vent and the flow port can be used to perform gradient coordination on the gas flow path, reducing the burden on the air guide cone, improving durability, and facilitating the rapid discharge of hot air flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the static end portion of the arc extinguishing chamber in the prior art;

[0022] Figure 2 Schematic diagram of the installation relationship between the gas guide cone, the static support, the gas baffle cover and the shielding cover of the arc extinguishing chamber of the circuit breaker in Example 1 of the present invention;

[0023] Figure 3 Schematic diagram of gas flow in the arc extinguishing chamber of the circuit breaker in embodiment 1 of the present invention;

[0024] Figure 4 This is a temperature contour distribution diagram of the arc extinguishing chamber of the circuit breaker in Example 1 of the present invention at the time of 12ms during the arcing stage;

[0025] Figure 5 This is a temperature contour distribution diagram of the arc extinguishing chamber of the circuit breaker in Example 1 of the present invention at the time of 14ms during the arcing stage;

[0026] Figure 6 This is a temperature contour distribution diagram of the arc extinguishing chamber of the circuit breaker in Example 1 of the present invention at the time of 15ms during the arcing stage;

[0027] Figure 7This is a temperature contour distribution diagram of the arc extinguishing chamber of the circuit breaker in Example 1 of the present invention at the time of 16ms during the arcing stage;

[0028] Figure 8 This is a temperature contour distribution diagram of the arc extinguishing chamber of the circuit breaker in Example 1 of the present invention at the time of 17ms during the arcing stage;

[0029] Figure 9 for Figure 1 Temperature contour distribution diagram of the arc extinguishing chamber in the prior art at 12ms during the arcing stage;

[0030] Figure 10 for Figure 1 Temperature contour distribution diagram of the arc extinguishing chamber in the prior art at 14ms during the arcing stage;

[0031] Figure 11 for Figure 1 Temperature contour distribution diagram of the arc extinguishing chamber in the prior art at 15ms during the arcing stage;

[0032] Figure 12 for Figure 1 Temperature contour distribution diagram of the arc extinguishing chamber in the prior art at 16ms during the arcing stage;

[0033] Figure 13 for Figure 1 Temperature contour distribution diagram of the arc extinguishing chamber in the prior art at 17ms during the arcing stage.

[0034] In the figure: 1. Air guide cone; 10. Air guide surface; 11. Spherical crown; 12. Conical surface; 13. Arc transition surface; 14. Plane; 2. Air baffle; 3. Air compression chamber; 4. Static support; 5. Shielding cover; 6. Static arc contact; 7. Nozzle; 8. Flow outlet. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. That is, the embodiments described herein are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein may be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely intended to represent selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0037] It should be noted that, in the specific embodiments of the present invention, terms such as “first” and “second” and other relational terms that may appear are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, terms such as “include”, “comprises” or any other variants thereof that may appear are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or elements that are inherent to such process, method, article or device. In the absence of further restrictions, elements defined by possible statements such as “including a…” do not exclude the presence of other identical elements in the process, method, article or device that includes the elements.

[0038] In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0039] In the description of the present invention, unless otherwise expressly specified or limited, the terms "provided with" and "provided with" should be understood broadly. For example, the object "provided with" may be a part of the main body, or may be arranged separately from the main body and connected to the main body. The connection may be detachable or non-detachable. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0040] The present invention is described in further detail below with reference to the examples.

[0041] Embodiment 1 of the arc extinguishing chamber of the circuit breaker of the present invention:

[0042] like Figure 2 、 Figure 3 As shown in the figure, only part of the structure of the arc extinguishing chamber of the circuit breaker is shown. The arc extinguishing chamber of the circuit breaker includes a static support 4, a gas guide cone 1, a gas shield 2, and a shield 5. The arc extinguishing chamber has a central axis. The static support 4, the gas guide cone 1, the gas shield 2, and the shield 5 are coaxially arranged relative to the central axis. The fracture of the arc extinguishing chamber (not shown in the figure) is located in front of the static support 4, the gas guide cone 1 is arranged on the rear side of the static support 4, the gas shield 2 is covered on the outer periphery of the static support 4, and the shield 5 is arranged at the front end of the static support 4. When the arc is ignited at the fracture, the high-temperature and high-pressure SF6 gas generated is as follows. Figure 3The hot air flows in the direction indicated by the middle arrow, enters the static support 4, flows toward the air guide cone 1, and after being guided by the air guide cone 1, enters the gap between the air baffle 2 and the static support 4, and is then discharged from the gap between the shielding cover 5 and the air baffle 2.

[0043] The static support 4 is a cylindrical structure, and the inner cavity of the static support 4 forms a compressed air chamber 3. A compressed air chamber flow channel for the hot air flow is formed in the compressed air chamber 3. The rear end of the static support 4 is spaced apart from the air guide cone 1 to form a flow port 8 for the hot air flow to pass through between the air guide cone 1 and the static support 4.

[0044] The air guide cone 1 is provided with an air guide surface 10 facing the air compression chamber 3 . The air guide surface 10 is a rotation surface with the central axis as the rotation center. The air guide surface 10 is used to guide the hot air flow flowing onto the air guide cone 1 . The air guide cone 1 has a conical portion protruding toward the static support 4, and the shape of the conical portion is approximately a cone. The front end of the conical portion is a tip, and the outer surface of the tip of the conical portion is a spherical crown 11. The outer surface of the part of the conical portion located at the rear side of the tip is a conical surface 12, so that a conical surface 12 is provided around the tip of the conical portion, and the conical surface 12 of the conical portion is tangent to the spherical crown 11. The part of the air guide cone 1 located at the rear side of the conical portion is a flat plate portion, and the flat plate portion has a forward plate surface, so that a plane 14 is provided around the conical portion of the air guide cone 1, and the plane 14 is an annular plane that surrounds the central axis. A circular arc transition surface 13 is provided between the plane 14 and the conical surface 12. The circular arc transition surface 13 refers to a rotation surface with the central axis as the center of rotation and the generatrix as an arc line. The arc line surrounds the central axis to form an arc transition surface 13 to make a smooth transition between the conical surface 12 and the plane 14. The spherical cap 11 , the conical surface 12 , the arc transition surface 13 , and the plane 14 together form the gas guide surface 10 .

[0045] The static support 4 has a rear end surface facing the air guide cone 1. The plane 14 of the air guide cone 1 is located on the rear side of the static support 4 and is opposite to the rear end surface of the static support 4 in the front and back direction. The flow port 8 is formed by the annular gap between the plane 14 and the rear end surface of the static support 4. The conical portion of the air guide cone 1 extends into the compressed air chamber 3, with the direction perpendicular to the central axis as the radial direction. The middle portion of the conical surface 12 of the conical portion in the direction of extension of the central axis corresponds radially to the rear end surface of the static support 4. The tip of the conical portion extends beyond the rear end of the static support 4 into the compressed air chamber 3, and the front portion of the conical surface 12 of the conical portion extends into the compressed air chamber 3, which is conducive to guiding the hot air flow and allowing it to pass through quickly.

[0046] The end of the air deflector 2 closest to the air guide cone 1 is fixed to the air guide cone 1. The rear end of the air deflector 2 protrudes backward from the static support 4, and the rear end surface of the air deflector 2 is connected to the flat surface 14 of the air guide cone 1. The air deflector 2 is hollow, and the rear end surface of the air deflector 2 is aligned with the flat surface 14 of the air guide cone 1 so that the flat surface 14 and the inner circumference of the air deflector 2 are in contact, which helps to smooth the air flow channel and increase the gas flow rate.

[0047] The inner circumference of the air baffle 2 and the outer circumference of the static support 4 are spaced apart to form an annular flow channel between the air baffle 2 and the static support 4. The annular flow channel is connected to the flow port 8, and a radially outward flow port 8 is formed between the air guide cone 1 and the static support 4. The hot air flow is guided by the conical surface 12 to flow radially out of the flow port 8, which is conducive to the smooth passage of the air flow and entry into the annular flow channel.

[0048] Two connecting ports are provided between the pressure chamber flow channel and the annular flow channel, and the two connecting ports are spaced apart along the extension direction of the central axis. A vent is provided in the middle of the static support 4 in the extension direction of the central axis for the passage of hot air, and the vent is correspondingly connected to the middle of the annular flow channel. The vent and the flow port 8 constitute two connecting ports spaced apart in front and back. By providing a vent in the middle of the static support 4, two connecting holes, the vent in the middle and the flow port 8 at the end, are formed between the pressure chamber flow channel and the annular flow channel. A part of the hot air flow will first enter the annular flow channel from the vent in the middle, and the other part will flow through the end gas guide cone 1 and enter the annular flow channel from the flow port 8 at the end, so that the vent and the flow port 8 can be used to perform gradient coordination on the gas flow path, reduce the burden on the gas guide cone 1, improve durability, and facilitate the rapid discharge of hot air flow.

[0049] The shielding cover 5 is positioned at the front end of the static support 4. The shielding cover 5 comprises an annular body and a cylindrical body. The inner edge of the annular body is fixed to the outer circumference of the static support 4. The inner circumference of the cylindrical body is spaced apart from the outer circumference of the static support 4 to form an annular groove. The front end of the air shield 2 extends into the annular groove. The gap between the outer circumference of the air shield 2 and the inner circumference of the shielding cover 5, as well as the gap between the front end of the air shield 2 and the annular body of the air shield 2, form the shielding cover flow channel. A rearward outlet is formed between the rear end of the cylindrical body of the shielding cover 5 and the outer circumference of the air shield 2, allowing the hot air flow to be discharged from the annular space flow channel through the shielding cover flow channel. The compressed air chamber flow channel, air guide surface 10, flow port 8, vent, annular space flow channel, and shielding cover flow channel are used to form an airflow channel for the hot air flow to be discharged from the arc extinguishing chamber.

[0050] This shape of the gas guide surface can make the air flow path in the arc extinguishing chamber smoother, which is conducive to the rapid reduction of the temperature in the air flow path. The regular shape of the gas guide cone does not require grooves, which reduces the processing difficulty and processing time.

[0051] The heat dissipation effect is simulated and analyzed comparatively. Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 As shown, the temperature distribution cloud diagram of the arc extinguishing chamber of the circuit breaker of the present invention at different times during the arcing stage can intuitively reflect the dynamic change process of the gas in the arc extinguishing chamber. The arcing stage is a process of arcing starting from 0ms.

[0052] Figure 4 This is the temperature contour distribution diagram of the arc extinguishing chamber of the present invention at the time of 12ms. At this time, the high temperature area of ​​the arc core has not diffused to the compressed air chamber. Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 These are the temperature contour distribution diagrams at 14ms, 15ms, 16ms, and 17ms respectively. The temperature gradually spreads to the entire airflow channel.

[0053] Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 、 Figure 13 yes Figure 1 The temperature distribution cloud diagram of the arc extinguishing chamber of the prior art at different times during the arcing stage is shown. Figure 9 This is the temperature contour distribution diagram at 12ms. At this time, the high temperature area of ​​the arc core has not diffused to the compression chamber. Figure 10 、 Figure 11 、 Figure 12 、 Figure 13 These are the temperature contour distribution diagrams at 14ms, 15ms, 16ms, and 17ms respectively. The temperature gradually spreads to the entire airflow channel.

[0054] By comparing the temperature contour distribution diagrams of the arc extinguishing chamber in the present invention and the arc extinguishing chamber in the prior art at the same time, it can be found that the temperature in the air flow channel of the arc extinguishing chamber in the prior art is significantly higher, and its gas guide cone affects the heat dissipation, while the overall temperature in the air flow channel of the arc extinguishing chamber in the present invention has dropped significantly, and the gas guide cone in the present invention effectively improves the overall heat dissipation capacity of the equipment.

[0055] Simulation analysis demonstrates that, without changing other structural or operational conditions, the gas guide cone with this design achieves a faster temperature drop within the airflow channel compared to existing gas guide cones under the same flow conditions. This effectively enhances heat dissipation and accelerates arc cooling, meeting standards and regulatory requirements. This allows the high-temperature, high-pressure SF6 gas within the compression chamber to dissipate quickly, rapidly cooling the arc and extinguishing it. This reduces contact erosion, improves gas flow capacity, and ultimately enhances the circuit breaker's breaking capacity, extending its service life and enhancing product competitiveness.

[0056] Embodiment 2 of the arc extinguishing chamber of the circuit breaker of the present invention:

[0057] This embodiment differs from Embodiment 1 in that, whereas in Embodiment 1, the end surface of the air deflector hood near the air guide cone is connected to a flat surface, in this embodiment, the rear end of the air deflector hood is disposed on the outer circumference of the air guide cone, and the inner circumference of the air deflector hood is in contact with the outer circumference of the air guide cone.

[0058] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments without inventive effort, or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An arc extinguishing chamber of a circuit breaker, comprising an air guide cone (1) and a static support (4) coaxially arranged relative to a central axis, the static support (4) being a cylindrical structure, the inner cavity of the static support (4) forming a compressed air chamber (3), an air guide surface (10) facing the compressed air chamber (3) being provided on the air guide cone (1), the air guide surface (10) being a rotating surface with the central axis as the center of rotation, the air guide surface (10) being used to guide a hot air flow flowing onto the air guide cone (1), the air guide cone (1) and the static support (4) being spaced apart to form a flow port (8) between the air guide cone (1) and the static support (4), wherein the air guide cone (1) and the static support (4) are characterized in that: The air guide cone (1) has a conical portion protruding toward the static support (4), the outer surface of the tip of the conical portion is a spherical crown (11), a conical surface (12) is provided around the tip of the conical portion, and the conical surface (12) is tangent to the spherical crown (11), a plane (14) is provided around the conical portion of the air guide cone (1), and a circular arc transition surface (13) is provided between the plane (14) and the conical surface (12), and the spherical crown (11), the conical surface (12), the circular arc transition surface (13), and the plane (14) together form an air guide surface (10).

2. The arc extinguishing chamber of the circuit breaker according to claim 1, characterized in that: The tapered portion extends into the compressed air chamber (3).

3. The arc extinguishing chamber of the circuit breaker according to claim 2, characterized in that: The static support (4) has a rear end face facing the air guide cone (1), with the direction perpendicular to the central axis as the radial direction, and the middle of the conical surface (12) of the conical portion in the extension direction of the central axis corresponds to the radial position of the rear end face of the static support (4).

4. The arc extinguishing chamber of the circuit breaker according to claim 3, characterized in that: The plane (14) is located at the rear side of the static support (4) and is opposite to the rear end face of the static support (4) in the front and rear directions. The annular gap between the plane (14) and the rear end face of the static support (4) forms the flow opening (8).

5. The arc extinguishing chamber of the circuit breaker according to claim 1, 2, 3 or 4, characterized in that: It also includes an air shield (2), which is arranged on the outer periphery of the static support (4), and the inner peripheral surface of the air shield (2) is spaced apart from the outer peripheral surface of the static support (4) to form an annular flow channel between the air shield (2) and the static support (4), and the annular flow channel is communicated with the flow port (8), and one end of the air shield (2) close to the air guide cone (1) is fixed on the air guide cone (1), and the plane (14) is connected to the inner peripheral surface of the air shield (2).

6. The arc extinguishing chamber of the circuit breaker according to claim 5, characterized in that: An end surface of the air shield (2) close to one end of the air guide cone (1) is connected to the plane (14).

7. The arc extinguishing chamber of the circuit breaker according to claim 5, wherein the pressure A compressed air chamber flow channel for hot air flow is provided in the air chamber (3), and two connecting ports are provided between the compressed air chamber flow channel and the annular space flow channel, and the two connecting ports are spaced apart along the extension direction of the central axis; a vent for hot air flow is provided in the middle portion of the static support (4) in the extension direction of the central axis, and the vent is correspondingly connected to the middle portion of the annular space flow channel; the vent and the flow port (8) form two connecting ports.

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