Circuit breaker
By designing arc-blocking components in the circuit breaker, optimizing arc output by utilizing buffer space and airflow channels, and employing nylon material and an integrated structure, the problem of arc-induced contact erosion is solved, thereby improving the reliability and service life of the circuit breaker.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-15
- Publication Date
- 2026-04-03
AI Technical Summary
Existing circuit breakers cannot output an electric arc in time during the breaking process, which easily burns the contacts.
A circuit breaker comprising a housing and an arc-blocking assembly is designed. The arc-blocking assembly consists of a first arc-blocking plate, an extension plate, and a second arc-blocking plate, with an included angle α of 0° < α ≤ 90°. The extension plate forms a buffer space with the housing. The second arc-blocking plate swings under the action of airflow to form an airflow channel. The wing plate and mounting section enhance the structural strength and heat dissipation effect. Nylon material is used to enhance high-temperature resistance.
It improves the service life of arc isolation components, reduces the residence time of electric arc in the equipment, reduces the risk of contact ablation, enhances structural strength and fatigue resistance, and simplifies the assembly process.
Smart Images
Figure CN224082403U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of switch technology, specifically to a circuit breaker. Background Technology
[0002] A circuit breaker typically consists of a moving contact and a stationary contact. When the moving contact is in contact with the stationary contact, the circuit breaker is in operation, and the current in the circuit is flowing. When an overload, short circuit, or other fault occurs in the circuit, the moving contact separates from the stationary contact, and the circuit breaker disconnects the circuit to prevent damage to electrical equipment or dangerous situations such as fires.
[0003] During the circuit breaker's tripping process, an electric arc is generated, which can be ejected outward from the arc-extinguishing chamber's outlet. Because the ejected arc can cause problems such as phase-to-phase breakdown and burning of external circuit breaker components, an arc-damping assembly is usually installed on the circuit breaker housing to mitigate or even avoid these problems.
[0004] Current circuit breakers cannot output electric arcs in a timely manner, which easily leads to the burning of contacts. Utility Model Content
[0005] This application provides a circuit breaker to overcome the problem that existing circuit breakers cannot output electric arcs in a timely manner and are prone to contact erosion.
[0006] To achieve the above objectives, this application provides a circuit breaker, including a housing and an arc-blocking assembly. The housing contains at least one arc-extinguishing chamber, and the housing has an air outlet corresponding to the arc-extinguishing chamber. The arc-blocking assembly corresponds to the arc-extinguishing chamber. The arc-blocking assembly is located at the air outlet and is matched to the air outlet. The arc-blocking assembly includes a first arc-blocking plate, an extension plate, and a second arc-blocking plate connected sequentially. The surfaces of the first and second arc-blocking plates are parallel. An angle α, where 0° < α ≤ 90°, is formed between the surface of the extension plate and the surface of the first arc-blocking plate. The second arc-blocking plate is located on the side of the first arc-blocking plate furthest from the arc-extinguishing chamber. Under the action of the airflow generated during the circuit breaker's breaking process, the end of the second arc-blocking plate furthest from the first arc-blocking plate can swing relative to the first arc-blocking plate.
[0007] When adopting the above technical solution, the arc-blocking component is located at the air outlet. The shape of the arc-blocking component can match the shape of the air outlet so that the arc-blocking component can block the air outlet, reduce the gap between the arc-blocking component and the housing, and prevent external dust, flying insects, etc. from entering the housing through the air outlet. At the same time, matching the arc-blocking component with the air outlet can reduce the vibration or displacement of the arc-blocking component under the impact of airflow, ensuring the reliability of long-term operation.
[0008] Because there is an angle α between the surface of the extension plate and the surface of the first arc-isolating plate (0° < α ≤ 90°), the second arc-isolating plate is located on the side of the first arc-isolating plate furthest from the arc-extinguishing chamber. Therefore, after the arc-isolating assembly is installed at the outlet position, a buffer space for airflow can be formed between the extension plate and the shell wall of the housing used to form the outlet. The buffer space can absorb instantaneous pressure changes in the airflow, balance the air pressure fluctuations in the airflow, prevent violent airflow fluctuations from impacting the arc-isolating assembly, and reduce the possibility of damage to the arc-isolating assembly due to pressure shock. This can improve the service life of the arc-isolating assembly and further extend the service life of the circuit breaker.
[0009] Meanwhile, the extension plate can prevent airflow from flowing away from the extension plate in the direction away from the first arc-blocking plate, and guide the airflow to flow away from the extension plate in the direction away from the second arc-blocking plate. This can optimize gas flow, prevent the arc from spreading disorderly inside the equipment, shorten the residence time of the arc in the housing, output the arc in time, and reduce the possibility of contact erosion.
[0010] Furthermore, under the influence of the airflow generated during the circuit breaker disconnection process, the end of the second arc diaphragm that is furthest from the first arc diaphragm can swing relative to the first arc diaphragm.
[0011] When the circuit breaker trips, the resulting airflow pushes the end of the second arc-isolating plate furthest from the first arc-isolating plate to swing relative to it. The swing direction of the second arc-isolating plate is the same as the airflow direction, causing it to swing away from the arc-extinguishing chamber. This creates a gap between the second arc-isolating plate and the air outlet, further forming a channel for airflow, allowing airflow to escape from the arc-extinguishing chamber and achieving a pressure relief effect.
[0012] In one possible implementation, wing portions are provided on both sides of the first arc-blocking plate along the direction from the first arc-blocking plate to the extension plate. The two wing portions are arranged opposite to each other, and the two wing portions and the first arc-blocking plate surround each other to form a U-shaped structure.
[0013] When the above technical solution is adopted, on the one hand, the bending stiffness and torsional performance of the arc-blocking assembly can be significantly improved, thereby enhancing the structural strength of the arc-blocking assembly. On the other hand, it can guide the airflow to move the electric arc in a specific direction, reducing the sputtering damage of the electric arc to surrounding components.
[0014] Furthermore, the wing-plate configuration increases the heat dissipation area of the arc-blocking assembly, accelerating the conduction and radiation of arc heat. Moreover, the wing-plate configuration facilitates the connection between the arc-blocking assembly and the housing, making the installation of the arc-blocking assembly easier.
[0015] In one possible implementation, mounting portions are provided on the side of each of the two wing portions away from the first arc-blocking plate, and the mounting portions extend in a direction away from the other wing portion.
[0016] When the above technical solution is adopted, on the one hand, the bending stiffness and torsional performance of the arc-isolating component can be significantly improved, thereby enhancing its structural strength. On the other hand, the heat dissipation area of the arc-isolating component can be increased, accelerating the conduction and radiation of arc heat. Furthermore, the installation part facilitates the connection between the arc-isolating component and the housing, making the installation of the arc-isolating component easier.
[0017] In one possible implementation, at the location of the air outlet, two protrusions are provided on the housing, which are arranged opposite to each other. There is a gap between the protrusions and the arc-extinguishing grid assembly of the circuit breaker, and the mounting part is inserted into the gap.
[0018] When using the above technical solution, if the base and cover are set separately, the mounting part can be directly inserted into the gap, and then the base and cover can be connected to install the arc-blocking component onto the housing. This connection method is relatively simple and convenient to operate. In specific implementation, a robotic arm can be used to grasp the arc-blocking component, and then the mounting part can be placed in the gap, which is conducive to achieving automated assembly.
[0019] In one possible implementation, a limiting boss is provided on the housing, which is used to limit contact with the side of the mounting part away from the extension plate.
[0020] When the above technical solution is adopted, when the mounting part is inserted between the protrusion and the partition, the side of the mounting part away from the extension plate is supported on the limiting boss, which can limit the arc isolation component and improve the stability of the arc isolation component on the housing.
[0021] In one possible implementation, a limiting part is provided on the side of the mounting part away from the limiting boss, and the limiting part is used to limit contact with the inner wall of the housing.
[0022] When the above technical solution is adopted, after the arc-blocking component is installed on the housing, the limiting part makes limiting contact with the inner wall of the housing, and the side of the mounting part away from the extension plate makes limiting contact with the limiting boss. This can improve the stability of the arc-blocking component installed on the housing and enhance the arc-blocking component's resistance to the impact of airflow.
[0023] In one possible implementation, a reinforcing plate is provided on the first arc-blocking plate.
[0024] When the above technical solution is adopted, the bending, torsion and compression resistance of the first arc diaphragm can be improved, the risk of deformation or breakage can be reduced, the structural strength of the first arc diaphragm can be enhanced, and the service life of the first arc diaphragm can be extended.
[0025] In one possible implementation, the thickness of the second arc diaphragm gradually decreases from the side of the second arc diaphragm closer to the extension plate to the side farther away from the extension plate.
[0026] When the above technical solution is adopted, under the action of airflow, the end of the second arc-blocking plate that is far away from the first arc-blocking plate is more likely to swing relative to the first arc-blocking plate, which makes it easier to form an airflow channel between the second arc-blocking plate and the air outlet, thus facilitating the discharge of the electric arc.
[0027] In one possible implementation, the arc-blocking component is a nylon arc-blocking component.
[0028] When the above technical solution is adopted, the arc isolation component is made of nylon material, which can significantly reduce the weight of the arc isolation component and reduce the load on the shell while ensuring sufficient strength of the arc isolation component.
[0029] Meanwhile, nylon material has the characteristics of high temperature resistance, which reduces the burn damage of high temperature electric arc to the arc isolation component and improves the high temperature resistance performance of the arc isolation component.
[0030] Furthermore, nylon is an excellent gas-generating material. At certain temperatures, it can produce a large amount of gas to blow away the electric arc, which not only accelerates the arc's decomposition and further promotes its extinction, but also elongates and thins the arc, increasing its surface area, rapidly reducing its temperature, and preventing further thermal ionization.
[0031] As described above, the use of nylon material in the arc-blocking assembly not only ensures the structural strength of the assembly but also enhances the cooling effect of the arc, facilitating arc extinguishing and improving arc-extinguishing efficiency. This reduces the burning effect of the high-temperature arc on the arc-blocking assembly and improves the reliability of the disconnection.
[0032] In one possible implementation, the arc-blocking component is a single, integrated structure.
[0033] By adopting the above technical solution, stress concentration problems caused by bolts or welding connections can be avoided, ensuring higher dimensional accuracy and consistency, and improving the structural strength of the arc-isolating assembly. Furthermore, the arc-isolating assembly eliminates the need for machining, reducing material usage and preventing waste. Moreover, the integrated structure reduces connection points, lowering the risk of failure due to loose connections, corrosion, or fatigue, and improving fatigue resistance. Additionally, it reduces the number of parts and assembly steps, simplifying the operation process. Attached Figure Description
[0034] Figure 1 This is a schematic diagram of the circuit breaker provided in an embodiment of this application.
[0035] Figure 2 This is a schematic diagram of the structure of the housing provided in an embodiment of this application.
[0036] Figure 3 This is a partial structural diagram of the circuit breaker provided in an embodiment of this application.
[0037] Figure 4 for Figure 3 Enlarged diagram of point A in the middle.
[0038] Figure 5 Schematic diagram of the arc-blocking assembly provided in the embodiments of this application Figure 1 .
[0039] Figure 6 Schematic diagram of the arc-blocking assembly provided in the embodiments of this application Figure 2 .
[0040] Figure 7 This is a schematic diagram of the structure of the base provided in an embodiment of this application.
[0041] Explanation of reference numerals in the attached figures:
[0042] 1-Shell, 11-Base, 111-Protrusion, 112-Limiting boss, 12-Cover, 13-Air outlet, 2-Arc isolation assembly
[0043] 21-First arc-blocking plate, 22-Extension plate, 23-Second arc-blocking plate, 24-Wing plate section, 25-Mounting section, 26-Limiting section,
[0044] 27-Reinforcing plate, 3-Arc extinguishing grid assembly, 4-Stationary contact. Detailed Implementation
[0045] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.
[0047] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0048] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. For example, in the description of this application, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0049] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.
[0050] In the description of this application, unless otherwise stated, "multiple" means two or more (including two), and similarly, "multiple groups" means two or more (including two groups).
[0051] A circuit breaker typically includes a housing, multiple arc-extinguishing grid assemblies, and multiple parallel passages. Each passage usually includes a moving contact and a stationary contact. The housing has an arc-extinguishing chamber corresponding to the arc-extinguishing grid assembly, which is housed within the arc-extinguishing chamber. Simultaneously, the housing has an air outlet corresponding to the arc-extinguishing chamber.
[0052] When the moving contact is in contact with the stationary contact, the circuit breaker is in operation, and the circuit in which the circuit breaker is located is current-carrying. When an overload, short circuit, or other fault occurs in the circuit in which the circuit breaker is located, the moving contact loses contact with the stationary contact, and the circuit breaker disconnects the circuit.
[0053] During the process of the moving contact and stationary contact disengaging, an electric arc is generated. The high temperature of the arc ionizes the air, forming a high-temperature, high-pressure gas, which can then form an airflow. An arc-extinguishing grid assembly typically consists of multiple stacked grid plates and partitions on both sides of these grid plates. Through physical segmentation and cooling, the arc-extinguishing grid assembly divides the arc generated during circuit breaker breaking into multiple short arcs and accelerates its cooling, causing the arc energy to dissipate rapidly. Subsequently, driven by the airflow, the arc is ejected outward from the outlet of the arc-extinguishing chamber.
[0054] Because outward-spraying electric arcs can cause problems such as phase-to-phase breakdown and burning of external circuit breaker components, an arc-blocking assembly is usually installed on the circuit breaker housing to mitigate or even avoid these problems.
[0055] In existing technologies, arc-quenching assemblies generally include two protective plates. That is, in existing technologies, two protective plates are generally installed at the air outlet, and the protective plate closer to the arc-quenching chamber can be a melamine board.
[0056] To provide a flow path for airflow, vent holes are typically made in the melamine board. However, in this case, dust, flying insects, and other particles can enter the circuit breaker through the vent holes.
[0057] Therefore, to improve the protection level, another protective plate is installed on the side of the melamine plate away from the arc-extinguishing chamber. This second protective plate can be made of white cardboard. During the process of the moving contact and the stationary contact disengaging, the generated airflow is discharged through the exhaust holes on the melamine plate and blows the white cardboard out of the arc-extinguishing chamber, thereby achieving the pressure relief effect.
[0058] However, existing circuit breakers still have the potential to fail to cool and extinguish the arc in time, making the contacts prone to burning.
[0059] In view of the problems existing in the above-mentioned prior art, please refer to Figures 1 to 4 As shown in the figure, this application provides a circuit breaker, which includes a housing 1 and an arc-extinguishing assembly 2. At least one arc-extinguishing chamber is provided inside the housing 1, and an air outlet 13 corresponding to the arc-extinguishing chamber is provided on the housing 1.
[0060] The arc isolation component 2 corresponds to the arc extinguishing chamber, that is, the number of arc isolation components 2 is the same as the number of arc extinguishing chambers, and one arc isolation component 2 corresponds to one arc extinguishing chamber.
[0061] In specific implementation, the circuit breaker provided in this application embodiment also includes a stationary contact 4 and an arc-extinguishing grid assembly 3, with the arc-extinguishing grid assembly 3 disposed in the arc-extinguishing chamber.
[0062] One end of the stationary contact 4 extends out of the housing 1 from the outlet 13, forming the incoming line terminal of the circuit breaker. In the embodiments provided in this application, the arc-extinguishing chamber is generally located near the incoming line terminal. The arc-blocking component 2 provided in this application is located at the outlet 13. The arc-blocking component 2 can reduce the risk of arc-induced breakdowns such as phase-to-phase breakdowns and arc-induced breakdowns with external equipment parts of the housing 1.
[0063] In practice, the number of arc-extinguishing chambers can be one, two, three, or more; no specific limit is set here.
[0064] In practice, the number of arc-extinguishing chambers, stationary contacts 4, arc-extinguishing grid assemblies 3, and arc-isolating assemblies 2 are the same and correspond one-to-one, that is, one arc-extinguishing chamber corresponds to one stationary contact 4, one arc-extinguishing grid assembly 3, and one arc-isolating assembly 2.
[0065] For example, the number of arc-extinguishing chambers can be one, two, three or more, and there is no specific limitation here. The shape of the arc-extinguishing chambers is also not specifically limited here.
[0066] Specifically, when there are two arc-extinguishing chambers, there are two stationary contacts 4, two arc-extinguishing grid assemblies 3, and two arc-isolation assemblies 2. Correspondingly, when there are three arc-extinguishing chambers, there are three stationary contacts 4, three arc-extinguishing grid assemblies 3, and three arc-isolation assemblies 2.
[0067] The arc-extinguishing grid assembly 3 is installed in the arc-extinguishing chamber of the housing 1. The housing 1 can accommodate and contain the arc-extinguishing grid assembly 3, providing a stable space for the components such as the arc-extinguishing grid assembly 3 installed in the housing 1, ensuring that they can work normally without external interference.
[0068] Meanwhile, the housing 1 provides positioning and support for the arc-extinguishing grid assembly 3, the stationary contact 4, and the arc-blocking assembly 2, preventing displacement or damage to components mounted on the housing 1 during operation. The housing 1 can also withstand a certain amount of external pressure, protecting the arc-extinguishing grid assembly 3 and the arc-blocking assembly 2 from damage.
[0069] In addition, the housing 1 has a protective function, which can prevent moisture, dust, dirt and other impurities from entering the interior of the housing 1, thereby avoiding corrosion or damage to the components installed inside the housing 1.
[0070] In practice, the shell 1 can be made of plastic, but it is not limited to this and the specific material depends on the actual situation. The structure of the shell 1 can be a cuboid structure, but this is not specifically limited here.
[0071] Combination Figure 1 and Figure 2As shown, the housing 1 generally includes a base 11 and a cover 12, with the four edges of the base 11 corresponding to the four edges of the cover 12. The base 11 has a first receiving cavity with one open end, and the cover 12 has a second receiving cavity with one open end. The opening end of the first receiving cavity faces the cover 12, while the opening end of the second receiving cavity faces the base 11. At this time, the cover 12 can be placed on the base 11.
[0072] After the base 11 and the cover 12 are connected, the first accommodating cavity and the second accommodating cavity cooperate to form the accommodating cavity of the shell 1, and the arc extinguishing grid assembly 3, moving contact and the like can be installed in the accommodating cavity.
[0073] The connection method between the base 11 and the cover 12 is not specifically limited here. For example, the connection method between the base 11 and the cover 12 can be bonding, welding or snap-fitting, etc. Of course, it is not limited to these in practice.
[0074] The base 11 has a first opening, and at the corresponding position, the cover 12 has a second opening. When the cover 12 is placed on the base 11, the first opening and the second opening combine to form the air outlet 13 provided in this embodiment of the application. Figure 2 As shown.
[0075] Arc isolation component 2 is disposed at air outlet 13, and arc isolation component 2 is matched with air outlet 13.
[0076] In specific implementation, the arc-blocking component 2 is located at the air outlet 13. The shape of the arc-blocking component 2 can match the shape of the air outlet 13 so that the arc-blocking component 2 can block the air outlet 13, reduce the gap between the arc-blocking component 2 and the housing 1, and prevent external dust, flying insects, etc. from entering the interior of the housing 1 through the air outlet 13.
[0077] In addition, the arc isolation component 2 is matched with the air outlet 13, which can reduce the vibration or displacement of the arc isolation component 2 under the impact of airflow and ensure the reliability of long-term operation.
[0078] like Figure 5 and Figure 6 As shown, the arc-blocking assembly 2 includes a first arc-blocking plate 21, an extension plate 22, and a second arc-blocking plate 23 connected end to end. In other words, the first arc-blocking plate 21 and the second arc-blocking plate 23 are connected by the extension plate 22. One side of the first arc-blocking plate 21 is connected to one side of the extension plate 22, and the other side of the extension plate 22 is connected to one side of the second arc-blocking plate 23.
[0079] The surface of the first arc-blocking plate 21 is parallel to the surface of the second arc-blocking plate 23, and the first arc-blocking plate 21 is parallel to the second arc-blocking plate 23.
[0080] The surface of the extension plate 22 and the surface of the first arc-blocking plate 21 form an angle α, where 0° < α ≤ 90°. The second arc-blocking plate 23 is located on the side of the first arc-blocking plate 21 that is furthest from the arc-extinguishing chamber.
[0081] Thus, after the arc-blocking assembly 2 is installed at the air outlet 13, a buffer space for airflow can be formed between the extension plate 22 and the shell wall of the housing 1 used to form the air outlet 13. The buffer space can absorb instantaneous pressure changes in the airflow, balance the air pressure fluctuations of the airflow, prevent violent airflow fluctuations from impacting the arc-blocking assembly 2, and reduce the possibility of damage to the arc-blocking assembly 2 due to pressure impact.
[0082] Meanwhile, the extension plate 22 can prevent the airflow from flowing away from the extension plate 22 in the direction of the first arc-blocking plate 21, and guide the airflow to flow away from the extension plate 22 in the direction of the second arc-blocking plate 23. This can optimize the gas flow, prevent the electric arc from spreading disorderly inside the equipment, and shorten the residence time of the electric arc in the housing 1.
[0083] Moreover, under the action of the airflow generated during the circuit breaker disconnection process, the end of the second arc diaphragm 23 that is away from the first arc diaphragm 21 can swing relative to the first arc diaphragm 21.
[0084] In this situation, when the circuit breaker trips, the resulting airflow can push the end of the second arc-isolating plate 23 away from the first arc-isolating plate 21 to swing relative to the first arc-isolating plate 21. It can be understood that the swing direction of the second arc-isolating plate 23 is the same as the airflow direction, causing the second arc-isolating plate 23 to swing away from the arc-extinguishing chamber. This creates a gap between the second arc-isolating plate 23 and the air outlet 13, further forming an airflow channel, allowing airflow to flow out of the arc-extinguishing chamber, achieving pressure relief and timely discharge of the electric arc.
[0085] In the embodiments provided in this application, when an overload, short circuit, or other fault occurs in the circuit where the circuit breaker is located, the moving contact and the stationary contact 4 disengage. When the circuit breaker disconnects the circuit, an electric arc is generated. The high temperature of the arc ionizes the air, forming a high-temperature, high-pressure gas, which can form an airflow. Driven by the airflow, the arc flows through the arc-extinguishing grid assembly 3 of the circuit breaker. The arc-extinguishing grid assembly 3 can divide the arc generated during the circuit breaker disconnection process into multiple short arcs through physical segmentation and cooling, and accelerate its cooling, so that the arc energy is rapidly dissipated.
[0086] Afterward, the airflow can be buffered at the position of the extension plate 22 and continue to flow away from the extension plate 22 in the direction of the second arc-blocking plate 23, and flow out from the gap between the second arc-blocking plate 23 and the air outlet 13.
[0087] When the circuit breaker is working normally, the second arc-blocking plate 23 cooperates with the air outlet 13 to block the air outlet 13, preventing dust, flying insects and other objects from entering the interior of the housing 1 through the air outlet 13.
[0088] In summary, compared to the circuit breakers in the prior art that use a combination of melamine board and white cardboard, the circuit breaker provided in this embodiment can form a buffer space at the extension plate 22. This buffer space can absorb instantaneous pressure changes in the airflow, balance air pressure fluctuations, prevent violent airflow fluctuations from impacting the arc-blocking assembly 2, and reduce the possibility of damage to the arc-blocking assembly 2 due to pressure impact. This can improve the service life of the arc-blocking assembly 2, and further extend the service life of the circuit breaker.
[0089] Meanwhile, the extension plate 22 optimizes gas flow, prevents the arc from spreading disorderly inside the equipment, shortens the residence time of the arc in the housing 1, outputs the arc in time, and reduces the possibility of contact erosion.
[0090] In specific implementation, the included angle α between the surface of the extension plate 22 and the surface of the first arc-blocking plate 21 can be 5°, 10°, 15°, 30°, 45°, 60°, 70°, 80°, 90°, etc., without specific limitation, and subject to the actual situation.
[0091] In practice, the method by which the arc-blocking component 2 is installed on the housing 1 is not specifically limited here, and the actual situation shall prevail.
[0092] For example, the arc-blocking component 2 can be installed on the housing 1 by welding, riveting, snap-fitting, etc., but in practice it is not limited to this.
[0093] In one possible implementation, refer to Figure 5 and Figure 6 As shown, wing portions 24 are provided on both sides of the first arc-blocking plate 21 along the direction from the first arc-blocking plate 21 to the extension plate 22. The two wing portions 24 are arranged opposite to each other, that is, the two wing portions 24 are arranged symmetrically.
[0094] Simultaneously, the two wing plates 24 and the first arc-blocking plate 21 form a U-shaped structure. This significantly improves the bending stiffness and torsional resistance of the arc-blocking assembly 2, enhancing its structural strength. Furthermore, it guides the airflow to direct the electric arc in a specific direction, reducing splash damage to surrounding components.
[0095] Furthermore, the wing plate portion 24 increases the heat dissipation area of the arc-blocking assembly 2, accelerating the conduction and radiation of arc heat. Moreover, the wing plate portion 24 facilitates the connection between the arc-blocking assembly 2 and the housing 1, making the installation of the arc-blocking assembly 2 easier.
[0096] In practice, the arc-blocking assembly 2 can be connected to the housing 1 via the wing plate 24.
[0097] In practice, the connection method between the wing plate 24 and the first arc-blocking plate 21 is not limited here, and the specific method shall be subject to the actual situation.
[0098] For example, the wing plate portion 24 can be connected to the first arc-blocking plate 21 by means of welding, snap-fitting, riveting, etc.
[0099] In one optional method, please continue to refer to Figure 5 and Figure 6 As shown, each of the two wing plate portions 24 has a mounting portion 25 on the side away from the first arc-blocking plate 21. The mounting portion 25 extends away from the other wing plate portion 24, so that the mounting portion 25 is located outside the U-shaped structure.
[0100] At this point, the installation part 25 significantly improves the bending stiffness and torsional performance of the arc-isolating component 2, thereby enhancing its structural strength. Furthermore, it increases the heat dissipation area of the arc-isolating component 2, accelerating the conduction and radiation of arc heat. Moreover, the installation part 25 facilitates the connection between the arc-isolating component 2 and the housing 1, thus aiding in the installation of the arc-isolating component 2.
[0101] In practice, the arc-blocking assembly 2 can be connected to the housing 1 via the mounting part 25, thereby achieving the connection between the housing 1 and the arc-blocking assembly 2.
[0102] In practice, the connection method between the mounting part 25 and the wing plate part 24 is not limited here, and the actual situation shall prevail.
[0103] For example, the wing plate portion 24 can be connected to the wing plate portion 24 by means of welding, snap-fitting, riveting, etc.
[0104] In some embodiments, please refer to Figure 4 As shown, at the position corresponding to the air outlet 13, two protrusions 111 are provided on the housing 1, which are arranged opposite to each other. There is a gap between the protrusions 111 and the arc extinguishing grid assembly 3 of the circuit breaker, and the mounting part 25 is inserted into the gap.
[0105] In practice, when the base 11 and the cover 12 are set separately, the mounting part 25 can be directly inserted into the gap. Then, the base 11 and the cover 12 are connected to install the arc-blocking component 2 onto the housing 1. This connection method is relatively simple and convenient to operate. In practice, a robotic arm can be used to grasp the arc-blocking component 2 and then place the mounting part 25 into the gap, which is conducive to achieving automated assembly.
[0106] Specifically, there is a gap between the partition plate and the protrusion 111 of the arc extinguishing grid assembly 3, and the mounting part 25 is inserted between the protrusion 111 and the partition plate.
[0107] In actual operation, the connection method between the protrusion 111 and the housing 1 is not limited here, and the specific method shall be subject to the actual situation.
[0108] For example, the protrusion 111 can be connected to the housing 1 by welding, snap-fitting, riveting, or other methods. Of course, the protrusion 111 can also be integrally formed on the housing 1 during the manufacturing process.
[0109] As an optional approach, such as Figure 7 As shown, a limiting boss 112 is provided on the housing 1. Specifically, the limiting boss 112 is provided on the base 11. The limiting boss 112 is used to limit contact with the side of the mounting part 25 away from the extension plate 22.
[0110] When the mounting part 25 is inserted between the protrusion 111 and the partition, the side of the mounting part 25 away from the extension plate 22 is supported on the limiting boss 112, which can limit the arc isolation component 2 and improve the stability of the arc isolation component 2 on the housing 1.
[0111] In specific implementation, the structure and dimensions of the limiting boss 112 are not specifically limited here. There can be two limiting bosses 112, and the two limiting bosses 112 are arranged opposite to each other so that the two limiting bosses 112 correspond one-to-one with the two mounting parts 25.
[0112] In actual operation, the connection method between the limiting boss 112 and the housing 1 is not limited here, and the specific method shall be subject to the actual situation.
[0113] For example, the limiting boss 112 can be connected to the housing 1 by welding, snap-fitting, riveting, or other methods. Of course, the limiting boss 112 can also be integrally formed on the housing 1 during the processing of the housing 1.
[0114] Additionally, it should be noted that it can be combined with Figure 1 , Figure 3 and Figure 7 As shown, in practice, the contact section of the stationary contact that contacts the moving contact is located below the arc-blocking assembly. The limiting boss 112 is provided to reserve installation space for the contact section, preventing the arc-blocking assembly from contacting the contact section.
[0115] Furthermore, such as Figure 5 and Figure 6 As shown, a limiting part 26 is provided on the side of the mounting part 25 away from the limiting boss 112, and the limiting part 26 is used to limit contact with the inner wall of the housing 1.
[0116] Thus, after the arc-blocking component 2 is installed on the housing 1, the limiting part 26 makes limiting contact with the inner wall of the housing 1, and the side of the mounting part 25 away from the extension plate 22 makes limiting contact with the limiting boss 112, which can improve the stability of the arc-blocking component 2 installed on the housing 1 and enhance the arc-blocking component 2's resistance to the impact of airflow.
[0117] Each of the two mounting portions 25 has a limiting portion 26 on the side away from the limiting boss 112. The connection method between the limiting portion 26 and the mounting portion 25 is not limited here, and shall be subject to the actual situation.
[0118] For example, the limiting part 26 can be connected to the mounting part 25 by welding, snap-fitting, riveting or other means.
[0119] As an optional approach, such as Figure 5 As shown, a reinforcing plate 27 is provided on the first arc-blocking plate 21.
[0120] In this way, the bending, torsion and compressive strength of the first arc diaphragm plate 21 can be improved, the risk of deformation or breakage can be reduced, the structural strength of the first arc diaphragm plate 21 can be enhanced, and the service life of the first arc diaphragm plate 21 can be extended.
[0121] The reinforcing plate 27 can be disposed on the side of the first arc-isolating plate 21 that is close to or far from the arc-extinguishing chamber, without specific limitation. The reinforcing plate 27 can be located at the geometric center of the first arc-isolating plate 21.
[0122] The shape of the reinforcing plate 27 is not specifically limited here. For example, the shape of the reinforcing plate 27 can be a triangle, a square, etc.
[0123] In actual operation, the connection method between the reinforcing plate 27 and the first arc-blocking plate 21 is not limited here, and the specific method shall be subject to the actual situation.
[0124] For example, the reinforcing plate 27 can be connected to the first arc-blocking plate 21 by welding, snap-fitting, riveting, or other means.
[0125] In one example, the thickness of the second arc diaphragm 23 gradually decreases from the side of the second arc diaphragm 23 closest to the extension plate 22 to the side furthest from the extension plate 22.
[0126] In other words, the thickness of the second arc-blocking plate 23 gradually decreases from the side of the second arc-blocking plate 23 closest to the extension plate 22 to the side furthest from the extension plate 22.
[0127] Thus, under the action of airflow, the end of the second arc-blocking plate 23 that is far away from the first arc-blocking plate 21 is more likely to swing relative to the first arc-blocking plate 21, and it is easier to form an airflow channel between the second arc-blocking plate 23 and the air outlet 13, which facilitates the discharge of the electric arc.
[0128] In one possible implementation, the arc-blocking component 2 is a nylon arc-blocking component.
[0129] Thus, the arc isolation component 2 is made of nylon material, which can significantly reduce the weight of the arc isolation component 2 and reduce the load on the housing 1 while ensuring sufficient strength of the arc isolation component 2.
[0130] Meanwhile, the nylon material has the characteristics of high temperature resistance, which reduces the burn damage of the arc isolation component 2 caused by the high temperature arc and improves the high temperature resistance of the arc isolation component 2.
[0131] Furthermore, nylon is an excellent gas-generating material. At certain temperatures, it can produce a large amount of gas to blow away the electric arc, which not only accelerates the arc's decomposition and further promotes its extinction, but also elongates and thins the arc, increasing its surface area, rapidly reducing its temperature, and preventing further thermal ionization.
[0132] In addition, the arc isolation component 2 is made of nylon material. Compared with the melamine board used in the existing arc isolation components, the nylon material arc isolation component is less likely to generate burrs, dust and glass fibers. When using automated vibrating plate and robotic arm to install the arc isolation component, it will not cause damage to the arc isolation component, which is beneficial to environmental protection.
[0133] Furthermore, the arc isolation assembly 2 is made of nylon, which has good toughness and elasticity. After the circuit breaker makes a trip, the second arc isolation plate can return to its original position, achieving a good seal of the housing.
[0134] As described above, the arc-blocking component 2 is made of nylon, which not only ensures the structural strength of the arc-blocking component 2, but also enhances the cooling effect of the electric arc, which is beneficial to the extinguishing of the electric arc and improves the arc extinguishing efficiency. This reduces the burning of the arc-blocking component 2 by the high-temperature electric arc and improves the reliability of the break.
[0135] In practical implementation, a certain proportion of glass fiber can be added to the nylon material to improve the structural strength of the arc-blocking component 2 and prevent the arc-blocking component 2 from deforming.
[0136] In some embodiments, the arc-blocking component 2 is an integral structure.
[0137] In actual operation, the first arc-blocking plate 21, extension plate 22, second arc-blocking plate 23, wing plate 24, mounting part 25, limiting part 26 and reinforcing plate 27 included in the arc-blocking assembly 2 can all be integrally formed.
[0138] This design not only avoids stress concentration issues caused by bolted or welded connections, ensuring higher dimensional accuracy and consistency, but also enhances the structural strength of the arc-isolating component 2. Furthermore, it eliminates the need for machining the arc-isolating component 2, reducing material usage and preventing waste. Moreover, the integrated structure reduces connection points, lowering the risk of failure due to loose connections, corrosion, or fatigue, and improving fatigue resistance. Additionally, it reduces the number of parts and assembly steps for the arc-isolating component 2, simplifying the operational process.
[0139] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, "connection" or "joining" in mechanical structures can refer to a physical connection, such as a fixed connection, for example, a connection fixed by a partition, such as a connection fixed by screws, bolts, or other partitions; a physical connection can also be a detachable connection, such as a snap-fit or interlocking connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
Claims
1. A circuit breaker characterized by, The utility model relates to a circuit breaker, including: A shell is arranged with at least one arc extinguishing chamber in, and the shell is opened with the gas outlet corresponding with the arc extinguishing chamber; Arc separation assembly corresponding with the arc extinguishing chamber, the arc separation assembly is arranged in the gas outlet, and the arc separation assembly is matched with the gas outlet, and the arc separation assembly includes first arc separation board, extension board and second arc separation board that connect in proper order, the surface of first arc separation board is parallel with the surface of second arc separation board, the surface of extension board and the surface of first arc separation board have included angle alpha, 0 DEG < alpha <= 90 DEG, the second arc separation board is located in the side of first arc separation board away from the arc extinguishing chamber, and under the action of the airflow generated in the breaking process of circuit breaker, the end of second arc separation board away from first arc separation board can swing relative to first arc separation board.
2. The circuit breaker of claim 1, wherein, Along the direction of first arc separation board to extension board, both sides of first arc separation board are provided with wing plate part, two wing plate parts are oppositely arranged, and two wing plate parts and first arc separation board surround and form U-shaped structure.
3. The circuit breaker of claim 2, wherein, The side of two wing plate parts away from first arc separation board is provided with mounting portion, and the mounting portion extends away from another wing plate part.
4. The circuit breaker of claim 3, wherein, Corresponding the position of gas outlet, the shell is provided with two convex parts that are oppositely arranged, the gap between the convex part and the arc extinguishing grid assembly of circuit breaker, the mounting portion is inserted in the gap.
5. The circuit breaker of claim 3, wherein, The shell is provided with limiting boss, and the limiting boss is used for limiting contact with the side of mounting portion away from extension board.
6. The circuit breaker of claim 5, wherein, The side of mounting portion away from limiting boss is provided with limiting portion, and the limiting portion is used for limiting contact with the inner wall of shell.
7. The circuit breaker of claim 1, wherein, The first arc separation board is provided with reinforcing plate.
8. The circuit breaker of claim 1, wherein, The thickness of second arc separation board gradually reduces from the side of second arc separation board close to extension board to the side away from extension board.
9. The circuit breaker of claim 1, wherein, The arc separation assembly is nylon arc separation assembly.
10. The circuit breaker of any one of claims 1 to 9, wherein, The arc separation assembly is integral structure.