A circuit breaker

Abstract

The application provides a circuit breaker, relates to the technical field of switches, and is used for timely discharging high-temperature and high-pressure gas when the circuit breaker is tripped. The circuit breaker comprises a shell, the shell comprises a first surface and a second surface oppositely arranged in a first direction, and a third surface and a fourth surface adjacent to each other and located between the first surface and the second surface. An exhaust port and a pressure relief port are arranged on the third surface. An arc-extinguishing chamber and a wiring space are arranged in the shell, and the pressure relief port is in communication with the arc-extinguishing chamber. First and second baffles connected to each other are further arranged in the shell. The first baffle is connected to the first surface and the second surface on two sides in the first direction, and the first baffle is located between the arc-extinguishing chamber and the wiring space. The second baffle is connected to the first surface and the second surface on two sides in the first direction, and the second baffle is located between the wiring space and the fourth surface. An exhaust passage is arranged between the second baffle and the fourth surface, and the exhaust passage is in communication with the exhaust port and the arc-extinguishing chamber at two ends.

Description

Technical Field

[0001] This application relates to the field of switch technology, specifically to a circuit breaker. Background Technology

[0002] A circuit breaker is an electrical device used to protect and control circuits. Its main function is to safely connect, carry, and disconnect the current in a circuit under normal or fault conditions, thereby ensuring electrical safety.

[0003] A circuit breaker typically consists of a moving contact and a stationary contact. When the moving and stationary contacts are in contact, the circuit is closed and the circuit breaker is in normal operating condition. When an abnormal situation such as a short circuit or overload occurs in the circuit, the moving and stationary contacts separate, interrupting the circuit current.

[0004] During the breaking process, an electric arc and high-temperature, high-pressure gas are generated between the moving and stationary contacts. If the high-temperature, high-pressure gas is not discharged in time, the temperature inside the circuit breaker will become too high. Excessive temperature will not only cause the circuit breaker to malfunction, but also pose electrical safety hazards to the product.

[0005] However, circuit breakers in the current technology often cannot discharge high-temperature and high-pressure gases in a timely manner. Utility Model Content

[0006] This application provides a circuit breaker for timely discharge of high-temperature and high-pressure gas when the circuit breaker trips.

[0007] To achieve the above objectives, this application provides a circuit breaker comprising a housing, including a first surface and a second surface disposed opposite to each other in a first direction, and a third surface and a fourth surface located between and adjacent to the first and second surfaces. An exhaust port and a pressure relief port are provided on the third surface. An arc-extinguishing chamber and a wiring space are disposed within the housing, and the pressure relief port is connected to the arc-extinguishing chamber. A first baffle and a second baffle are also disposed within the housing and connected to each other. The first baffle is connected to the first surface and the second surface on both sides along the first direction, and is located between the arc-extinguishing chamber and the wiring space. The second baffle is connected to the first surface and the second surface on both sides along the first direction, and is located between the wiring space and the fourth surface. An exhaust channel is provided between the second baffle and the fourth surface, and both ends of the exhaust channel are connected to the exhaust port and the arc-extinguishing chamber, respectively.

[0008] When the above technical solution is adopted, an arc-extinguishing chamber and a wiring space are provided inside the casing, and the pressure relief port is connected to the arc-extinguishing chamber. The setting of the pressure relief port can provide a controllable and directional venting channel for the high-temperature and high-pressure gases, metal particles, etc. generated when the circuit breaker breaks, so as to reduce the possibility of high-temperature and high-pressure gas backflow and reduce the probability of explosion due to pressure accumulation inside the circuit breaker.

[0009] There is an exhaust channel between the second baffle and the fourth surface, and the two ends of the exhaust channel are connected to the exhaust port and the arc-extinguishing chamber, respectively.

[0010] At this time, the high-temperature and high-pressure gas and metal particles generated when the circuit breaker breaks can flow out from the arc-extinguishing chamber through the exhaust channel and exhaust port, which can reduce the possibility of high-temperature and high-pressure gas backflow and reduce the probability of explosion due to pressure accumulation inside the circuit breaker.

[0011] When using the circuit breaker provided in this application, the high-temperature and high-pressure gases, metal particles, etc. generated during circuit breaker breaking can be discharged to the outside of the casing through the exhaust port and pressure relief port. The setting of the exhaust port and pressure relief port increases the gas flow path and increases the exhaust space, ensuring that the arc-extinguishing gas can be discharged to the outside of the circuit breaker in a timely and rapid manner, achieving the effect of high-speed arc extinguishing and improving the reliability of the circuit breaker.

[0012] In one possible implementation, the number of exhaust ports is multiple.

[0013] When the above technical solution is adopted, not only can the exhaust space be increased, thus improving the rate at which high-temperature and high-pressure gas is discharged from the inside of the casing, but also the high-temperature and high-pressure gas can be discharged from different exhaust ports, making the discharged gas more dispersed, reducing the density of metal particles, and allowing the gas energy to be reduced rapidly. This prevents the high-temperature and high-pressure gas from damaging other nearby devices outside the distribution box or circuit breaker due to its high energy level after discharge.

[0014] In one possible implementation, there are multiple pressure relief ports.

[0015] When the above technical solution is adopted, not only can the exhaust space be increased, thus improving the rate at which high-temperature and high-pressure gas is discharged from the inside of the casing, but also the high-temperature and high-pressure gas can be discharged from different pressure relief ports, making the discharged gas more dispersed, reducing the density of metal particles, and allowing the gas energy to be reduced rapidly. This prevents the high-temperature and high-pressure gas from damaging other nearby devices outside the distribution box or circuit breaker due to its high energy level after discharge.

[0016] Furthermore, the presence of multiple pressure relief ports can reduce the risk of excessive air pressure on the side of the arc-extinguishing chamber furthest from the fourth surface, which could cause airflow backflow.

[0017] In one possible implementation, the first baffle is inclined away from the end of the first baffle away from the second baffle to the end where the first baffle and the second baffle are connected.

[0018] When the above technical solution is adopted, the high-temperature and high-pressure gas can be guided to flow along the first baffle to the exhaust channel, so as to efficiently and smoothly discharge the high-temperature and high-pressure gas from the exhaust port.

[0019] In one possible implementation, a first protrusion is provided on the first surface and / or the second surface. The first protrusion extends parallel to the first baffle. The first protrusion is located between the first baffle and the arc-extinguishing chamber, and corresponds to the air inlet side of the pressure relief port.

[0020] When the above technical solution is adopted, since the first protrusion is opposite to the air inlet side of the pressure relief port, when the high-temperature and high-pressure gas and metal particles generated when the circuit breaker breaks come out of the arc-extinguishing chamber, they can be blocked by the first protrusion and their discharge path can be changed. This reduces the possibility of metal particles being directly ejected from the pressure relief port and weakens the energy of the gas ejected from the pressure relief port, thus preventing damage to the distribution box or other nearby devices outside the circuit breaker.

[0021] In one possible implementation, a blocking structure is also provided inside the housing, and the blocking structure is located inside the exhaust channel.

[0022] When the above technical solution is adopted, when the high temperature and high pressure gas and metal particles generated when the circuit breaker breaks out come out of the arc-extinguishing chamber and flow through the exhaust channel, the metal particles can be blocked by the blocking structure, reducing the possibility of metal particles being directly ejected from the exhaust port and weakening the energy of the gas ejected from the exhaust port, so as to avoid damaging the distribution box or other nearby devices outside the circuit breaker.

[0023] In one possible implementation, the contact assembly of the circuit breaker is located within the housing. The contact assembly includes a moving contact and a stationary contact, the contact position of which is located on the side of the arc-extinguishing chamber away from the third surface. A second protrusion is provided on the first surface and / or the second surface, the second protrusion being located between the contact position and the operating mechanism of the circuit breaker.

[0024] When the above technical solution is adopted, when the high-temperature and high-pressure gas and metal particles generated during circuit breaker tripping flow to the second protrusion, the second protrusion increases the gas flow resistance, thus blocking the gas flowing towards the operating mechanism. Simultaneously, metal particles can be blocked by the second protrusion. The second protrusion effectively prevents metal particles and high-temperature and high-pressure gas from flowing to the operating mechanism, reducing damage to the operating mechanism.

[0025] In one possible implementation, the moving contact includes a contact support, a contact bracket, and a moving contact body, with the contact support disposed within the housing. The contact bracket is rotatably mounted on the contact support, and the axis of rotation of the contact bracket is parallel to a first direction. A first extension plate is disposed on the side of the contact bracket near the third surface, extending away from the contact bracket. The moving contact body is movably mounted on the contact bracket.

[0026] When the above technical solution is adopted, when the high-temperature and high-pressure gas and metal particles generated during circuit breaker tripping flow to the first extension plate, the first extension plate increases the gas flow resistance and obstructs the gas flowing towards the contact support. Simultaneously, the metal particles collide with the first extension plate, creating a reverse flow. The first extension plate can prevent the gas and metal particles from continuing to flow towards the contact support, reducing damage to the contact support and operating mechanism.

[0027] In one possible implementation, a second extension plate is provided on the side of the contact support near the third surface, and the second extension plate extends toward the moving contact body. There is a gap between the second extension plate and the first extension plate.

[0028] When the above technical solution is adopted, when the high-temperature and high-pressure gas and metal particles generated during circuit breaker tripping flow to the second extension plate, the second extension plate increases the gas flow resistance, blocking the gas flowing between the contact support and the contact holder. Simultaneously, the metal particles collide with the second extension plate, creating a reverse flow. The second extension plate prevents the gas and metal particles from continuing to flow away from the arc-extinguishing chamber, forcing them to flow towards the arc-extinguishing chamber.

[0029] There is a gap between the second extension plate and the first extension plate to ensure that the arrangement of the second extension plate and the first extension plate will not interfere with the mutual rotation between the contact bracket and the contact support.

[0030] In one possible implementation, the arc-extinguishing grid included in the circuit breaker is located within the arc-extinguishing chamber. The arc-extinguishing grid comprises a plurality of spaced and parallel grid plates. The plurality of grid plates are arranged sequentially along a second direction, which is perpendicular to the first direction. The length of the plurality of grid plates furthest from the fourth surface is less than the length of the remaining grid plates, serving to form an venting space between the arc-extinguishing chamber and the stationary contacts of the circuit breaker.

[0031] When the above technical solution is adopted, an exhaust space can be formed between the arc-extinguishing chamber and the stationary contacts of the circuit breaker, which makes it easy to guide high-temperature and high-pressure gas into the arc-extinguishing chamber through the exhaust space.

[0032] In one possible implementation, a wiring port is also provided on the third surface, communicating with the wiring space. The circuit breaker also includes a wiring baffle, which comprises a connecting plate and two wing plates opposite each other on both sides of the connecting plate. The connecting plate is fitted to the third surface. A clearance hole corresponding to the pressure relief port is provided on the connecting plate. A clearance area corresponding to the exhaust port is also provided on the connecting plate. A U-shaped space is formed between the connecting plate and the two wing plates; the opening of the U-shaped space faces away from the third surface. A wiring hole is also provided on the connecting plate, corresponding to the wiring port.

[0033] When adopting the above technical solution, the connecting plate is provided with a clearance hole corresponding to the pressure relief port to ensure that high-temperature and high-pressure gas can be smoothly discharged from the inside of the shell to the outside of the shell through the pressure relief port and the clearance hole. The connecting plate is also provided with a clearance area corresponding to the exhaust port to ensure that high-temperature and high-pressure gas can be smoothly discharged from the inside of the shell to the outside of the shell through the exhaust port and the clearance area. A U-shaped space is formed between the connecting plate and the two wing plates, with the opening of the U-shaped space facing away from the third surface. In this case, when multiple circuit breakers are installed in parallel, the electrical clearance and creepage distance between the terminals of two adjacent circuit breakers can be increased, effectively reducing short-circuit faults and arcing breakdowns caused by insufficient electrical clearance or creepage distance, thereby ensuring the stable operation of the circuit breakers and the safety of the power system. 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 A partial structural diagram of the circuit breaker provided in the embodiments of this application. Figure 1 .

[0036] Figure 3 A partial structural diagram of the circuit breaker provided in the embodiments of this application. Figure 2 .

[0037] Figure 4 This is a schematic diagram of the structure of the base provided in an embodiment of this application.

[0038] Figure 5 This is a schematic diagram of the structure of the cover provided in an embodiment of this application.

[0039] Figure 6 This is a schematic diagram of the moving contact provided in an embodiment of this application.

[0040] Figure 7 This is a schematic diagram of the wiring baffle provided in an embodiment of this application.

[0041] Explanation of reference numerals in the attached figures: 1-Shell, 11-Base, 12-Cover, 13-Exhaust port, 14-Pressure relief port, 15-Arc extinguishing chamber, 16-Wiring space 17 - Exhaust passage, 18 - Wiring port, 2 - First baffle, 21 - First baffle No. 1, 22 - First baffle No. 2 3-Second baffle, 31-First second baffle, 32-Second baffle, 4-First protrusion, 5-Blocking structure 51-Location post, 52-Location boss, 6-Contact assembly, 61-Moving contact, 611-Contact support, 6111-Second extension plate. 612-Contact support, 6121-First extension plate, 613-Moving contact body, 62-Stationary contact, 7-Second protrusion. 8-Operating mechanism, 9-Arc extinguishing grid, 91-Grid plate, 10-Wiring baffle, 101-Connecting plate, 1011-Allowance hole 1012 - Avoidance area, 1013 - Wiring hole, 102 - Wing plate. Detailed Implementation

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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).

[0048] With the vigorous development of the new energy industry, the requirements for circuit breaker technical performance are becoming higher. In order to meet the needs of the load and adapt to high voltage, traditional single-break circuit breakers are being converted into series double-break circuit breakers.

[0049] Specifically, two stationary contacts can be installed inside the circuit breaker housing, and two moving contacts can be installed on the moving contacts, with each moving contact corresponding to one of the two stationary contacts. When the two moving contacts are in contact with their respective stationary contacts, the energy carried by a single set of moving and stationary contacts is reduced by applying the principle of series voltage division.

[0050] In this case, the circuit breaker is a double-break circuit breaker. While maintaining the same space occupied by the original circuit breaker, adding an extra set of breaks inside the casing undoubtedly reduces the arc-extinguishing space of a single break, thus greatly increasing the difficulty of gas-blown arc extinguishing. Since gas-blown arc extinguishing is one of the main methods of arc extinguishing in circuit breakers, how to ensure that the effectiveness of gas-blown arc extinguishing is not reduced while minimizing the arc-extinguishing space has become a pressing problem for engineers.

[0051] In existing technologies, a vent is often opened on the circuit breaker housing. However, this method cannot promptly discharge the high-temperature and high-pressure gas generated when the circuit breaker is disconnected.

[0052] In view of the problems existing in the prior art, such as Figures 1 to 3 As shown, this application embodiment provides a circuit breaker. It should be noted that the circuit breaker provided in this application embodiment can be an AC circuit breaker or a DC circuit breaker, and can be a single-break circuit breaker or a double-break circuit breaker.

[0053] The circuit breaker provided in this application embodiment includes a housing 1, which includes a first surface and a second surface disposed opposite to each other in a first direction, and a third surface and a fourth surface located between and adjacent to the first surface and the second surface.

[0054] In practice, the shell 1 can be made of plastic. The shell 1 can be a cuboid structure.

[0055] The first surface and the second surface are parallel and arranged opposite each other in a first direction, and both the first surface and the second surface are perpendicular to the first direction.

[0056] The third surface is located between the first and second surfaces, and can be perpendicular to the first surface. The third surface connects to both the first and second surfaces on either side of the first direction. The third surface can also be parallel to the first and second directions.

[0057] The fourth surface is located between the first and second surfaces, and can be perpendicular to the first surface. The fourth surface connects to both the first and second surfaces on either side of the first direction. The fourth surface can be parallel to both the first and third directions.

[0058] The first direction, the second direction, and the third direction are all perpendicular to each other. It should be noted that in the embodiments provided in this application, the first direction, the second direction, and the third direction are only for the convenience of describing the positional relationship between the various components included in the circuit breaker, and are not intended to limit the specific scope of this application.

[0059] In practice, the housing 1 provided in this application embodiment includes, as follows: Figure 4 The base 11 shown and as Figure 5 The cover 12 is shown. Both the cover 12 and the base 11 have open receiving spaces. When the cover 12 is placed on the base 11, it forms the shell 1 provided in the embodiment of this application.

[0060] The first surface is the side of the base 11 that is away from the cover 12. The second surface is the side of the cover 12 that is away from the base 11. The third and fourth surfaces can be formed by connecting the cover 12 and the base 11 together.

[0061] In specific implementation, the connection method between the cover 12 and the base 11 is not specifically limited here. For example, the cover 12 and the base 11 can be connected together by welding, snap-fitting, or screw connection.

[0062] Please combine Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, an exhaust port 13 and a pressure relief port 14 are provided on the third surface. The specific dimensions and number of the exhaust port 13 and the pressure relief port 14 are not specifically limited here.

[0063] The housing 1 contains an arc-extinguishing chamber 15 and a wiring space 16. The arc-extinguishing chamber 15 contains an arc-extinguishing grid 9. When a short circuit or overload occurs in the circuit where the circuit breaker is located, an electric arc is generated during the process of the moving contact 61 and the stationary contact 62 disengaging to interrupt the circuit current. The arc is guided to the arc-extinguishing grid 9, which extinguishes the arc.

[0064] In practical implementation, a wiring port 18 is also provided on the third surface, such as... Figure 1 and Figure 2As shown, the wiring port 18 is connected to the wiring space 16. One end of the wiring terminal included in the circuit breaker can be located within the wiring space 16. The wiring port 18 facilitates the connection of the wiring terminal to external wires.

[0065] The pressure relief port 14 is connected to the arc-extinguishing chamber 15. The setting of the pressure relief port 14 can provide a controllable and directional venting channel for the high-temperature and high-pressure gas, metal particles and other substances generated when the circuit breaker is disconnected, so as to reduce the possibility of high-temperature and high-pressure gas backflow and reduce the probability of explosion due to pressure accumulation inside the circuit breaker.

[0066] The housing 1 is also provided with a first baffle 2 and a second baffle 3 connected to each other. The first baffle 2 is connected to the first surface and the second surface on both sides along the first direction, and the first baffle 2 is located between the arc extinguishing chamber 15 and the wiring space 16.

[0067] In specific implementation, the first baffle 2 includes a first baffle 21 and a second baffle 22. The first baffle 21 can be mounted on the base 11, such as... Figure 4 As shown. One side of the first baffle 21 along the first direction can be disposed on the first surface, and the other side of the first baffle 21 can extend along the first direction toward the second surface.

[0068] The connection between the first baffle 21 and the first surface can be welding, snap-fitting, or bonding, but in practice it is not limited to these methods.

[0069] In the embodiments provided in this application, the first baffle 21 can be integrally formed with the first surface.

[0070] The second first baffle 22 can be set on the cover 12, such as Figure 5 As shown. One side of the second first baffle 22 along the first direction can be disposed on the second surface, and the other side of the second first baffle 22 can extend toward the first surface along the first direction.

[0071] The connection between the second first baffle 22 and the second surface can be welding, snap-fitting, or bonding, but in practice it is not limited to these methods.

[0072] In the embodiments provided in this application, the second first baffle 22 can be integrally formed with the second surface.

[0073] When the cover 12 is connected to the base 11, the side of the first baffle 21 away from the first surface is in contact with the side of the second baffle 22 away from the second surface.

[0074] Additionally, it should be noted that in the embodiments provided in this application, both ends of the pressure relief port 14 can penetrate the third surface and the first baffle 2. Please refer to... Figure 2 , Figure 4 and Figure 5 As shown. The air intake side of the pressure relief port 14 is the side of the pressure relief port 14 closest to the arc-extinguishing chamber 15. The air intake side of the pressure relief port can correspond to the middle position of the arc-extinguishing chamber 15 in the second direction.

[0075] The second baffle 3 is connected to the first surface and the second surface on both sides along the first direction, and the second baffle 3 is located between the wiring space 16 and the fourth surface.

[0076] In specific implementation, the second baffle 3 includes a first second baffle 31 and a second second baffle 32. The first second baffle 31 can be mounted on the base 11, such as... Figure 4 As shown, the first baffle 21 is connected to the second baffle 31. One side of the second baffle 31 along the first direction can be disposed on the first surface, and the other side of the second baffle 31 can extend along the first direction toward the second surface.

[0077] The connection between the first second baffle 31 and the first surface can be welding, snap-fitting, or bonding, but in practice it is not limited to these methods.

[0078] In the embodiments provided in this application, the first second baffle 31 can be integrally formed with the first surface.

[0079] The second baffle 32 can be installed on the cover 12, such as Figure 5 As shown, the second first baffle 22 is connected to the second second baffle 32. One side of the second second baffle 32 along the first direction can be disposed on the second surface, and the other side of the second second baffle 32 can extend towards the first surface along the first direction.

[0080] The connection between the second baffle 32 and the second surface can be welding, snap-fitting, or bonding, but in practice it is not limited to these methods.

[0081] In the embodiments provided in this application, the second baffle 32 can be integrally formed with the second surface.

[0082] When the cover 12 is connected to the base 11, the side of the first second baffle 31 away from the first surface is in contact with the side of the second second baffle 32 away from the second surface.

[0083] There is an exhaust channel 17 between the second baffle 3 and the fourth surface, and the two ends of the exhaust channel 17 are connected to the exhaust port 13 and the arc-extinguishing chamber 15, respectively.

[0084] At this time, the high-temperature and high-pressure gas, metal particles and other substances generated when the circuit breaker breaks can flow out from the arc-extinguishing chamber 15 through the exhaust channel 17 and the exhaust port 13, which can reduce the possibility of high-temperature and high-pressure gas backflow and reduce the probability of explosion due to pressure accumulation inside the circuit breaker.

[0085] When using the circuit breaker provided in this application embodiment, the high-temperature and high-pressure gas, metal particles, etc. generated during circuit breaker breaking can be discharged to the outside of the housing 1 through the exhaust port 13 and the pressure relief port 14. The arrangement of the exhaust port 13 and the pressure relief port 14 increases the gas flow path and the exhaust space, ensuring that the arc-extinguishing gas can be discharged to the outside of the circuit breaker in a timely and rapid manner, achieving the effect of high-speed arc extinguishing and improving the reliability of the circuit breaker.

[0086] It should be noted that when the circuit breaker is a double-break circuit breaker, it has two arc-extinguishing chambers 15, which are spaced apart in the first direction. In this case, a partition can be installed inside the housing 1 to separate the two arc-extinguishing chambers 15. There are two exhaust channels 17, with one exhaust channel 17 corresponding to one arc-extinguishing chamber 15, facilitating rapid gas transfer.

[0087] In addition, in the embodiments provided in this application, compared with the prior art, the circuit breaker provided in the embodiments of this application can increase the exhaust space by increasing the cross-section of the exhaust channel 17, so that the high temperature and high pressure gas can be quickly transferred to the exhaust port 13 after exiting the arc extinguishing chamber 15.

[0088] In one example, the number of exhaust ports 13 is multiple, such as... Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown.

[0089] This not only increases the exhaust space and improves the rate at which high-temperature, high-pressure gas is discharged from inside the casing 1, but also allows the gas to be discharged from different exhaust ports 13, making the discharged gas more dispersed, reducing the density of metal particles, and allowing the gas energy to decrease rapidly. This prevents the high-temperature, high-pressure gas from damaging other nearby devices outside the distribution box or circuit breaker due to its high energy level.

[0090] The specific number of exhaust ports 13 is not limited here. For example, the number of exhaust ports 13 can be two, three, four or more.

[0091] In the embodiments provided in this application, such as Figure 1 and Figure 2 As shown, there are eight exhaust ports 13, which can be arranged in an array.

[0092] When the circuit breaker is a double-break circuit breaker, and a partition is installed inside the housing 1, resulting in two exhaust channels 17 within the housing, each exhaust channel 17 corresponds to at least one exhaust port 13. In another example, the number of pressure relief ports 14 is multiple, such as... Figure 2 As shown.

[0093] This not only increases the exhaust space and improves the rate at which high-temperature, high-pressure gas is discharged from inside the casing 1, but also allows the gas to be discharged from different pressure relief ports 14, making the discharged gas more dispersed, reducing the density of metal particles, and rapidly reducing the gas energy. This prevents the high-temperature, high-pressure gas from damaging other nearby devices outside the distribution box or circuit breaker due to its high energy level.

[0094] Furthermore, the multiple pressure relief ports 14 can reduce the excessive air pressure on the side of the arc-extinguishing chamber 15 away from the fourth surface, thus preventing airflow backflow.

[0095] The specific number of pressure relief ports 14 is not limited here. For example, the number of pressure relief ports 14 can be two, three, four, or more. In the embodiments provided in this application, as... Figure 1 and Figure 2 As shown, there are four pressure relief ports 14.

[0096] As one possible approach, please combine Figures 3 to 5 As shown, from the end of the first baffle 2 away from the second baffle 3 to the end where the first baffle 2 and the second baffle 3 are connected, the first baffle 2 is inclined away from the arc-extinguishing chamber 15.

[0097] At this time, the high-temperature and high-pressure gas can be guided to flow along the first baffle 2 to the exhaust channel 17 so that the high-temperature and high-pressure gas can be discharged from the exhaust port 13 efficiently and smoothly.

[0098] In some embodiments, please refer to Figures 3 to 5 As shown, a first protrusion 4 is provided on the first surface and / or the second surface. In a specific implementation, the first protrusion 4 can be a plate-like structure. The first protrusion 4 can be provided only on the first surface, only on the second surface, or on both the first and second surfaces.

[0099] When a first protrusion 4 is provided on the first surface, the first protrusion 4 and the first surface can be connected together by means of welding, snap-fitting, or bonding. Of course, the actual method is not limited to this.

[0100] In the embodiments provided in this application, the first protrusion 4 can be integrally formed with the first surface.

[0101] When a first protrusion 4 is provided on the second surface, the first protrusion 4 and the second surface can be connected together by means of welding, snap-fitting, or bonding. Of course, the actual method is not limited to this.

[0102] In the embodiments provided in this application, the first protrusion 4 can be integrally formed with the second surface.

[0103] The first protrusion 4 extends in a direction parallel to the first baffle 2, meaning that the extension path of the first protrusion 4 can be the same as the extension path of the first baffle 2, so as to guide the gas to quickly transfer to the exhaust channel 17.

[0104] The first protrusion 4 is located between the first baffle 2 and the arc-extinguishing chamber 15, and the first protrusion 4 corresponds to the air inlet side of the pressure relief port 14. The air inlet side of the pressure relief port 14 can be formed on the first baffle 2. The air outlet side of the pressure relief port 14 is located on the third surface.

[0105] At this time, since the first protrusion 4 is opposite to the air inlet side of the pressure relief port 14, when the high-temperature and high-pressure gas and metal particles generated when the circuit breaker is disconnected come out of the arc-extinguishing chamber, they can be blocked by the first protrusion 4 and their discharge path can be changed. As a result, the possibility of metal particles being directly ejected from the pressure relief port 14 can be reduced, and the energy of the gas ejected from the pressure relief port 14 can be weakened to avoid damaging the distribution box or other nearby devices outside the circuit breaker.

[0106] In practice, the size of the first protrusion 4 in the first direction is larger than the size of the pressure relief port 14 in the first direction.

[0107] At this time, from the third direction upward, the first protrusion 4 can fully block the pressure relief port 14, which can minimize the possibility of metal particles being ejected directly from the pressure relief port 14 and weaken the energy of the gas ejected from the pressure relief port 14, so as to avoid damaging other nearby devices outside the distribution box or circuit breaker.

[0108] As one possible implementation method, please combine Figures 3 to 5 As shown, a blocking structure 5 is also provided inside the housing 1, and the blocking structure 5 is located inside the exhaust channel 17.

[0109] Thus, when the high-temperature and high-pressure gas and metal particles generated when the circuit breaker breaks out come out of the arc-extinguishing chamber and flow through the exhaust channel 17, the metal particles can be blocked by the blocking structure 5, reducing the possibility of metal particles being directly ejected from the exhaust port 13 and weakening the energy of the gas ejected from the exhaust port 13, so as to avoid damaging the distribution box or other nearby devices outside the circuit breaker.

[0110] In specific implementation, the blocking structure 5 can be a blocking post, and the axis of the blocking post can extend along the first direction. One end of the blocking post can be set on the first surface, or one end of the blocking post can be set on the second surface.

[0111] The blocking structure 5 may also include a positioning post 51 and a positioning boss 52, the axis of which can extend along a first direction. The positioning boss 52 is provided with a positioning hole that mates with the positioning post 51, the axis of which can extend along the first direction, and the axis of the positioning post 51 can coincide with the axis of the positioning hole.

[0112] One end of the positioning post 51 can be disposed on the first surface, or the other end of the positioning post 51 can be disposed on the second surface. When one end of the positioning post 51 is disposed on the first surface, the positioning boss 52 is correspondingly disposed on the second surface.

[0113] like Figure 4 and Figure 5 As shown, when one end of the positioning post 51 is disposed on the second surface, the positioning boss 52 is disposed on the first surface accordingly.

[0114] When the base 11 and the cover 12 are connected, the positioning post 51 engages with the positioning hole. The positioning post 51 and the positioning boss 52 provide alignment and matching when the base 11 and the cover 12 are connected. Furthermore, after the base 11 and the cover 12 are connected, the positioning post 51 can be inserted into the positioning hole, enhancing the connection stability between the base 11 and the cover 12.

[0115] In one possible implementation, the contact assembly 6 of the circuit breaker is located within the housing 1. For example... Figure 3 As shown, the contact assembly 6 includes a moving contact 61 and a stationary contact 62.

[0116] In practice, the stationary contact 62 can be fixedly installed inside the housing 1, while the moving contact 61 is rotatably installed in the housing 1 via the operating mechanism 8 included in the circuit breaker. When the operating mechanism 8 drives the moving contact 61 to rotate relative to the housing 1, the moving contact 61 has both a contact state and a disengaged state relative to the stationary contact 62. When the moving contact 61 is in the contact state, it is in contact with the stationary contact 62. When the moving contact 61 is in the disengaged state, it is no longer in contact with the stationary contact 62.

[0117] Please combine Figures 3 to 5 As shown, the contact position of the moving contact 61 and the stationary contact 62 is located on the side of the arc-extinguishing chamber 15 away from the third surface. A second protrusion 7 is provided on the first surface and / or the second surface, and the second protrusion 7 is located between the contact position and the operating mechanism 8 of the circuit breaker.

[0118] When the circuit breaker trips, the high-temperature, high-pressure gas and metal particles generated flow to the second protrusion 7. The second protrusion 7 increases the gas flow resistance, thus blocking the gas flowing towards the operating mechanism 8. Simultaneously, the metal particles are blocked by the second protrusion 7. The second protrusion 7 effectively prevents metal particles and high-temperature, high-pressure gas from flowing to the operating mechanism 8, reducing damage to the operating mechanism 8.

[0119] In practice, the second protrusion 7 can be a long strip-shaped structure. The second protrusion 7 can extend in a third direction.

[0120] The second protrusion 7 may be provided only on the first surface, or only on the second surface, or on both the first and second surfaces.

[0121] When a second protrusion 7 is provided on the first surface, the second protrusion 7 can be connected to the first surface by means of welding, snap-fitting, or bonding. Of course, it is not limited to these methods in practice.

[0122] In the embodiments provided in this application, the second protrusion 7 can be integrally formed with the first surface.

[0123] When a second protrusion 7 is provided on the second surface, the second protrusion 7 and the second surface can be connected together by means of welding, snap-fitting, or bonding. Of course, it is not limited to these methods in practice.

[0124] In the embodiments provided in this application, the second protrusion 7 can be integrally formed with the second surface.

[0125] As an optional approach, please combine Figure 3 and Figure 6 As shown, the moving contact 61 includes a contact support 611, a contact bracket 612, and a moving contact body 613. The contact support 611 is disposed on the housing 1. The contact support 611 can be disposed on the housing 1 indirectly or directly.

[0126] The contact support 612 is rotatably mounted on the contact support 611, and the rotation axis of the contact support 612 is parallel to the first direction.

[0127] In a specific implementation, two first connecting ears can be provided on the contact support 612, and the two first connecting ears can be arranged opposite each other in a first direction. At the same time, two second connecting ears can be provided on the contact support 611, and the two second connecting ears can be arranged opposite each other in the first direction.

[0128] In addition, connection holes are provided on both the first and second connecting ears. A connecting shaft can be used to pass through the connection holes on the first and second connecting ears, and the connecting shaft is rotatably connected to both the first and second connecting ears, thereby realizing a rotatable connection between the contact bracket 612 and the contact support 611.

[0129] A first extension plate 6121 is provided on the side of the contact support 612 near the third surface, and the first extension plate 6121 extends away from the contact support 612.

[0130] At this time, when the high-temperature and high-pressure gas and metal particles generated during the circuit breaker trip flow to the first extension plate 6121, the first extension plate 6121 increases the gas flow resistance and blocks the gas flowing towards the contact support 611. Simultaneously, the metal particles collide with the first extension plate 6121, creating a reverse flow. The first extension plate 6121 prevents the gas and metal particles from continuing to flow towards the contact support 611, reducing damage to the contact support 611 and the operating mechanism 8.

[0131] The first extension plate 6121 and the contact support 612 can be connected together by welding, snap-fitting, or screw connection. Of course, the first extension plate 6121 can also be integrally formed with the contact support 612.

[0132] The moving contact body 613 is movably mounted on the contact support 612. The moving contact body 613 and the contact support 612 can be fixedly connected. The moving contact body 613 is used to contact or disengage from the stationary contact 62. The moving contact body 613 is movably mounted on the contact support 612, while the contact support 612 is rotatably mounted on the contact support 611. When the contact support 612 moves, it synchronously drives the moving contact body 613 to rotate, causing the moving contact body 613 to switch between a contact state and a disengaged state.

[0133] Furthermore, please combine Figure 3 and Figure 6 As shown, a second extension plate 6111 is provided on the side of the contact support 611 near the third surface, and the second extension plate 6111 extends toward the moving contact body 613.

[0134] At this time, when the high-temperature, high-pressure gas and metal particles generated during the circuit breaker trip flow to the second extension plate 6111, the second extension plate 6111 increases the gas flow resistance, blocking the gas flowing between the contact support 612 and the contact support 611. Simultaneously, the metal particles collide with the second extension plate 6111, creating a reverse flow. The second extension plate 6111 prevents the gas and metal particles from continuing to flow away from the arc-extinguishing chamber 15, forcing them to flow towards the arc-extinguishing chamber 15.

[0135] The second extension plate 6111 and the contact support 611 can be connected together by welding, snap-fitting, or screw connection. Of course, the second extension plate 6111 can also be integrally formed with the contact support 611.

[0136] The dimensions of the second extension plate 6111 are not specifically limited here. There is a gap between the second extension plate 6111 and the first extension plate 6121 to ensure that there is no interference with the mutual rotation between the contact bracket 612 and the contact support 611.

[0137] In one alternative approach, such as Figure 3 As shown, the arc-extinguishing grid 9 included in the circuit breaker is located within the arc-extinguishing chamber 15. The arc-extinguishing grid 9 includes a plurality of spaced and parallel grid plates 91. The plurality of grid plates 91 are arranged sequentially along a second direction, which is perpendicular to the first direction. Among them, the length of the plurality of grid plates 91 that are far from the fourth surface is less than the length of the remaining grid plates 91, which is used to form an exhaust space between the arc-extinguishing chamber 15 and the stationary contact 62.

[0138] Thus, an exhaust space is formed between the arc-extinguishing chamber 15 and the stationary contact 62 of the circuit breaker. Specifically, the stationary contact 62 has an extension extending away from the fourth surface from the contact position, located on the side away from the moving contact 61. The exhaust space is located between the extension and the grid plate 91. The extension, forming an exhaust space between the arc-extinguishing chamber 15 and the stationary contact 62, guides high-temperature, high-pressure gas into the exhaust space, and further guides the high-temperature, high-pressure gas into the arc-extinguishing chamber 15.

[0139] In specific implementation, the exact length and number of grid plates 91 are not specifically limited here. The length extension direction of grid plate 91 can be parallel to a third direction.

[0140] The grid 91 can include short grids and long grids, with the long grids being longer than the short grids. In practice, 3-4 grids 91 furthest from the fourth surface can be set as short grids, and the remaining grids 91 can be set as long grids. Alternatively, 3-4 grids 91 furthest from the fourth surface can be set as short grids, and the remaining grids can be set as alternating short and long grids.

[0141] Currently, with the development of the new energy industry, the load voltage requirements for DC circuit breakers are higher, and conventional circuit breakers cannot meet the needs of electrical safety. At the same time, the rated load voltage of single-pole circuit breakers often cannot meet the circuit carrying capacity requirements, and multiple circuit breakers often need to be used in series to increase the voltage carrying capacity.

[0142] To increase electrical clearance and creepage distance, in the embodiments provided in this application, such as Figure 1 As shown, the circuit breaker also includes a wiring baffle 10.

[0143] In practice, the wiring baffle 10 can be made of insulating material. For example, the wiring baffle 10 can be made of insulating plastic, but it is not limited to this.

[0144] like Figure 7 As shown, the wiring baffle 10 includes a connecting plate 101 and two wing plates 102 disposed opposite to each other on both sides of the connecting plate 101.

[0145] In a specific implementation, one side of the wing plate 102 is connected to one side of the connecting plate 101. The wing plate 102 and the connecting plate 101 can be fixedly connected. For example, the wing plate 102 and the connecting plate 101 can be connected together by welding, snap-fitting, or bonding.

[0146] Of course, the connecting plate 101 and the two wing plates 102 can also be integrally formed. The specific connection method between the connecting plate 101 and the wing plates 102 is not limited here, and the actual situation shall prevail.

[0147] The connecting plate 101 is attached to the third surface. The connecting plate 101 is parallel to the third surface and is disposed on the third surface. In actual operation, the connecting plate 101 can be disposed on the third surface by means of welding, riveting or snap-fitting.

[0148] The connecting plate 101 has a clearance hole 1011 corresponding to the pressure relief port 14 to ensure that high-temperature and high-pressure gas can be smoothly discharged from the inside of the housing 1 to the outside of the housing 1 through the pressure relief port 14 and the clearance hole 1011. The connecting plate 101 also has a clearance area 1012 corresponding to the exhaust port 13 to ensure that high-temperature and high-pressure gas can be smoothly discharged from the inside of the housing 1 to the outside of the housing 1 through the exhaust port 13 and the clearance area 1012.

[0149] A wiring port 18 is provided on the third surface, such as Figure 1 and Figure 2 As shown, the wiring port 18 is connected to the wiring space 16. The connecting plate 101 is also provided with a wiring hole 1013 corresponding to the wiring port 18, which facilitates the connection of the wiring terminal to the external wire.

[0150] A U-shaped space is formed between the connecting plate 101 and the two wing plates 102, with the opening of the U-shaped space facing away from the third surface. When multiple circuit breakers are installed side-by-side, this increases the electrical clearance and creepage distance between the terminals 18 of adjacent circuit breakers, effectively reducing short-circuit faults and arcing caused by insufficient electrical clearance or creepage distance, thereby ensuring the stable operation of the circuit breakers and the safety of the power system.

[0151] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "assembly," "connection," and "joining" should be interpreted broadly. For example, "connection" or "joining" in mechanical structures can refer to a physical connection. A physical connection can be a fixed connection, such as a connection secured by fasteners, such as a connection secured by screws, bolts, or other fasteners; 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 in that, The device includes a housing, which includes a first surface and a second surface disposed opposite to each other in a first direction, and a third surface and a fourth surface located between and adjacent to the first surface and the second surface; an exhaust port and a pressure relief port are provided on the third surface; an arc-extinguishing chamber and a wiring space are provided inside the housing, and the pressure relief port is connected to the arc-extinguishing chamber; The housing is further provided with a first baffle and a second baffle connected to each other; the first baffle is connected to the first surface and the second surface on both sides along the first direction, and the first baffle is located between the arc-extinguishing chamber and the wiring space; the second baffle is connected to the first surface and the second surface on both sides along the first direction, and the second baffle is located between the wiring space and the fourth surface; The second baffle and the fourth surface have an exhaust channel, the two ends of which are connected to the exhaust port and the arc-extinguishing chamber, respectively.

2. The circuit breaker according to claim 1, characterized in that, The number of exhaust ports is multiple; and / or the number of pressure relief ports is multiple.

3. The circuit breaker according to claim 1, characterized in that, From the end of the first baffle away from the second baffle to the end where the first baffle connects with the second baffle, the first baffle is inclined in a direction away from the arc-extinguishing chamber.

4. The circuit breaker according to claim 1, characterized in that, A first protrusion is provided on the first surface and / or the second surface; the extension direction of the first protrusion is parallel to the first baffle; the first protrusion is located between the first baffle and the arc-extinguishing chamber; and the first protrusion corresponds to the air inlet side of the pressure relief port.

5. The circuit breaker according to claim 1, characterized in that, The housing also includes a blocking structure located within the exhaust channel.

6. The circuit breaker according to any one of claims 1 to 5, characterized in that, The contact assembly of the circuit breaker is located within the housing; the contact assembly includes a moving contact and a stationary contact, the contact position of the moving contact and the stationary contact being located on the side of the arc-extinguishing chamber away from the third surface; a second protrusion is provided on the first surface and / or the second surface, the second protrusion being located between the contact position and the operating mechanism of the circuit breaker.

7. The circuit breaker according to claim 6, characterized in that, The moving contact includes: Contact support is provided in the housing; A contact support is rotatably mounted on the contact support; the rotation axis of the contact support is parallel to the first direction; a first extension plate is provided on the side of the contact support near the third surface, and the first extension plate extends away from the contact support. The moving contact body is movably mounted on the contact support.

8. The circuit breaker according to claim 7, characterized in that, The contact support has a second extension plate disposed on the side near the third surface, the second extension plate extending toward the moving contact body; there is a gap between the second extension plate and the first extension plate.

9. The circuit breaker according to any one of claims 1 to 5, characterized in that, The arc-extinguishing grid included in the circuit breaker is located in the arc-extinguishing chamber; the arc-extinguishing grid includes a plurality of spaced and parallel grid plates; the plurality of grid plates are arranged sequentially along a second direction, which is perpendicular to the first direction; wherein, the length of the plurality of grid plates away from the fourth surface is less than the length of the remaining grid plates, for forming an exhaust space between the arc-extinguishing chamber and the stationary contact of the circuit breaker.

10. The circuit breaker according to any one of claims 1 to 5, characterized in that, The third surface is also provided with a wiring port; the wiring port is connected to the wiring space; the circuit breaker also includes a wiring baffle, the wiring baffle includes a connecting plate and two wing plates disposed opposite to each other on both sides of the connecting plate; The connecting plate is attached to the third surface; the connecting plate has clearance holes corresponding to the pressure relief port; The connecting plate is also provided with a clearance area corresponding to the exhaust port; a U-shaped space is formed between the connecting plate and the two wing plates; the opening of the U-shaped space is away from the third surface; The connecting plate is also provided with wiring holes, which correspond to the wiring ports.

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