Air slot attachment for circuit breaker

Abstract

An air outlet slot accessory for a circuit breaker, comprising a circuit breaker body used in cooperation with the air outlet slot accessory, a plurality of arc extinguishing chambers are arranged in the circuit breaker body, a plurality of air channels corresponding to the number of arc extinguishing chambers are arranged on the air outlet slot accessory, and the air channels are arranged corresponding to the top end of the arc extinguishing chambers, the circuit breaker body comprises an operating surface cover on which an operating handle is arranged, the operating surface cover is provided with a mounting groove, and the air outlet slot accessory is provided with a mounting block corresponding to the mounting groove, and the circuit breaker body and the air outlet slot accessory are detachably mounted through the cooperation of the mounting groove and the mounting block. The utility model has the advantages that through the cooperation of the mounting groove and the mounting block, the detachable connection of the air outlet slot accessory and the circuit breaker body is realized, the user can flexibly disassemble and assemble the accessory according to the actual use scene, and the adaptability and convenience of the equipment are improved.

Description

Technical Field

[0001] This utility model relates to a circuit breaker accessory, and more particularly to an air outlet slot accessory for a circuit breaker. Background Technology

[0002] In existing circuit breaker structures, the venting slot, as a key component for arc gas emission, is primarily used in high-current breaking scenarios. When the circuit breaker performs a tripping operation, the high-temperature, high-pressure gas generated in the arc chamber is directionally discharged through a pre-installed venting slot. This structure typically employs a flow-guiding channel design integrally formed with the circuit breaker body, guiding the ionized gas to a specific area for dissipation. This technology is widely used in industrial distribution cabinets, power transmission equipment, and other applications requiring frequent interruption of high currents. Pressure gradient control is achieved through the gas expansion chamber within the slot, which, in conjunction with the arc-extinguishing grid, accelerates arc cooling. During operation, the geometry of the venting slot directly affects airflow velocity and heat dissipation efficiency. Existing products often employ fixed-angle inclined slots or honeycomb porous structures to ensure effective discharge of arc products while preventing backflow of external media.

[0003] Current integrated exhaust duct structures have significant limitations: their inseparable design from the circuit breaker housing results in insufficient functional expandability. For applications requiring no directional gas emission, such as low-voltage power distribution or dry environments, fixed exhaust ducts may compromise equipment sealing and introduce dust accumulation risks; while for special operating conditions requiring enhanced gas management, it's impossible to retrofit optimized exhaust components. This rigid structural design forces manufacturers to pre-produce multiple specifications, significantly increasing inventory pressure and production costs. More seriously, when the exhaust duct suffers structural damage due to prolonged exposure to high-temperature gas, the entire circuit breaker housing must be replaced, leading to resource waste and increased maintenance costs. Furthermore, fixed exhaust ducts cannot adapt to operating conditions with different installation orientations, easily causing exhaust path conflicts in space-constrained compact distribution boxes. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides an air outlet slot accessory for circuit breakers that can be disassembled and installed on circuit breakers according to usage requirements.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a gas outlet slot accessory for a circuit breaker, comprising a circuit breaker body used in conjunction with the gas outlet slot accessory, wherein the circuit breaker body is provided with a plurality of arc-extinguishing chambers, and the gas outlet slot accessory is provided with a plurality of gas channels corresponding to the number of arc-extinguishing chambers, and the gas channels are provided at the top of the arc-extinguishing chambers. The circuit breaker body includes an operating face cover on which an operating handle is provided, and the operating face cover is provided with an installation groove. The gas outlet slot accessory is provided with an installation block corresponding to the installation groove. The circuit breaker body and the gas outlet slot accessory are detachably installed through the cooperation of the installation groove and the installation block.

[0006] The beneficial effects of this utility model are as follows: The design of the mounting slot and mounting block allows for a detachable connection between the vent slot accessory and the circuit breaker body. This facilitates flexible assembly and disassembly of the accessory according to actual usage scenarios. For example, when maintenance or component replacement is required, the entire circuit breaker does not need to be disassembled, improving the adaptability and convenience of the equipment. Simultaneously, this modular design allows for separate handling of accessories and the main body during sales, reducing inventory and transportation costs. As a preferred embodiment, the mounting slot can adopt a T-shaped slot structure, and the mounting block can be designed with a matching T-shaped protrusion. After insertion, it can be locked by rotation or pushing, enabling quick installation and disassembly. The bottom of the mounting block can be equipped with an elastic buckle that automatically engages when inserted into the mounting slot and releases by manual pressing, ensuring a secure connection and easy operation. Another preferred embodiment uses a sliding rail guide for the engagement of the mounting slot and mounting block. The slot has an anti-detachment flange, and the side of the block has a groove that engages with it, preventing accidental detachment and reducing alignment difficulties during installation, thus improving user operating efficiency. These structural designs not only simplify the disassembly and assembly process, but also enhance the versatility of accessories, making them applicable to different types of circuit breaker bodies, further reducing maintenance complexity and spare parts management difficulty.

[0007] Furthermore, the air outlet slot accessory is the same width as the operating face cover, the mounting slots are symmetrically arranged on both sides of the operating face cover, and the center of both the mounting slot and the mounting block is provided with fixing holes for fasteners to be inserted.

[0008] This design ensures alignment between the vent slot accessory and the edge of the operating face cover through a uniform width configuration, avoiding irregular protrusions and improving the overall neatness and aesthetics of the appearance. It also reduces the risk of interference when installing the equipment in confined spaces. Symmetrically arranged mounting slots and fixing holes provide balanced fixing points on both sides, effectively preventing the vent slot accessory from warping or loosening due to uneven stress after installation, enhancing connection stability, especially under vibration or impact environments. As a preferred approach, the fixing holes can be designed as threaded holes, using bolts as fasteners. The bolt heads have a countersunk structure to ensure they are flush with the surface of the mounting block, ensuring no protrusion after fixing. Simultaneously, the symmetrical layout of the mounting slots uses a mirror design, with symmetrical guide bevels on both sides of the mounting block, automatically centering the mounting during insertion and reducing installation deviation. Another preferred approach is to optimize the fixing hole position through finite element analysis in stress concentration areas, such as by adding reinforcing ribs at the center of the mounting block to distribute the load applied by the fasteners, preventing hole wall deformation, thereby extending service life and improving overall structural strength, suitable for industrial scenarios involving frequent disassembly and assembly.

[0009] Furthermore, the operating surface cover is provided with a support platform for the mounting block to abut against, and the support platform cooperates with the mounting groove so that the mounting block is completely submerged in the operating surface cover.

[0010] The synergistic effect of the abutment and mounting groove allows the mounting block to be fully embedded inside the operating faceplate, eliminating external protrusions and significantly improving the overall appearance and aesthetics, while reducing the risk of dust or foreign object accumulation. The abutment provides additional support surface, allowing the mounting block to distribute load evenly under stress, enhancing connection stability and vibration resistance, and preventing loosening or displacement. As a preferred option, the abutment can be designed as an L-shaped stepped structure, with its vertical surface tightly fitting the end face of the mounting block, limiting axial movement through friction; simultaneously, the depth of the mounting groove matches the height of the mounting block, and a buffer pad is placed at the bottom of the groove to ensure that the surface of the block is flush with the faceplate after insertion. Another preferred option is a ramped transition design for the abutment, where the mounting block slides into place along the ramp and is temporarily fixed by a flexible pin, simplifying the installation process. This structure absorbs the impact force generated by the operating handle during operation, reducing wear on accessories and improving long-term reliability.

[0011] Furthermore, the end face of the mounting groove facing the center of the circuit breaker body is a first guide arc surface, and the mounting block includes a guide portion, one side of which is configured as a second guide arc surface that cooperates with the first guide arc surface.

[0012] The cooperation between the first and second guide arc surfaces provides a progressive guiding function, automatically guiding the mounting block into the correct position when it is inserted into the mounting slot. This significantly reduces the difficulty and error of installation alignment and improves operational efficiency. The arc surface design reduces frictional resistance, avoids jamming or damage, and ensures smooth insertion and precise positioning. As a preferred method, the guide arc surface can adopt a tapered structure, with the radius of curvature decreasing from the inlet to the centerline, allowing the mounting block to gradually converge to the centerline during insertion. Simultaneously, the guide section is equipped with ball bearings that roll in contact with the arc surface, reducing sliding friction and achieving resistance-free positioning. Another preferred method is to use a convex-concave meshing principle for the arc surface cooperation. The first guide arc surface is a concave groove, and the second guide arc surface is a convex ridge. During insertion, the ridge slides along the groove and automatically corrects the angle, ensuring that the mounting block is aligned with the axis of the mounting slot. This structure can maintain stable guidance and prevent displacement under vibration.

[0013] Furthermore, the mounting block also includes an abutment portion, the two perpendicular end faces of which abut against the two end faces of the abutment platform respectively.

[0014] The abutment part, through its two vertical end faces contacting the corresponding end faces of the abutment platform, forms a multi-dimensional limiting mechanism. This effectively constrains the X and Y direction displacement of the air outlet accessory after insertion, ensuring accurate and secure installation and preventing misalignment or shaking caused by external forces. This design simplifies the installation process, allowing users to achieve precise positioning without additional adjustments. As a preferred option, the abutment part can be designed as a rectangular protrusion, with its two vertical faces respectively fitting against the horizontal and vertical surfaces of the abutment platform, ensuring tight contact through interference fit or micro-gap. Simultaneously, the abutment platform end faces are coated with a wear-resistant coating to reduce wear during long-term use and maintain limiting accuracy. Another preferred option is a spring-loaded structure for the abutment part, with an internally embedded compression spring, ensuring the end face always elastically presses against the abutment platform. This automatically compensates for gaps during thermal expansion and contraction of the equipment, preventing loosening. This structure is particularly suitable for environments with large temperature variations, improving long-term stability.

[0015] Furthermore, a first fastening hole is provided at the corresponding position between adjacent air passages on the air outlet slot accessory and the circuit breaker body. Several first fastening holes are located between two fixing holes, and the fixing holes and the first fastening holes are arranged at equal intervals on the air outlet slot accessory.

[0016] The placement of a first fastening hole between the air passages, equidistant from the fixing holes, provides additional connection points, disperses stress from the fixing holes, and significantly strengthens the overall connection between the air outlet accessory and the circuit breaker body, preventing deformation or separation due to localized loads. The equidistant layout ensures uniform stress distribution, improving the reliability of the accessory under high pressure or vibration environments. As a preferred approach, the first fastening hole can be designed as a through-hole structure, with double-ended bolts penetrating the air outlet accessory and the circuit breaker body, and secured with nuts on both sides, forming a distributed fixing network. Simultaneously, the hole positions can be arranged in an array, for example, with one hole at the center of every two air passages, optimizing load distribution. Another preferred approach is to embed anti-loosening washers within the first fastening hole. When the bolt is pre-tightened, the washers deform to absorb vibration energy, preventing bolt retraction. This structure extends the accessory's lifespan and simplifies maintenance by evenly distributing the pressure across the fixing holes.

[0017] Furthermore, the vent slot accessory also includes a base plate, on which a plurality of limiting blocks are provided. The circuit breaker body is provided with limiting slots corresponding to the limiting blocks for insertion. The base plate and the circuit breaker body cooperate to form a connection hole for the copper busbar to pass through.

[0018] The base plate, through the insertion and engagement of the limiting block and the limiting groove, enables rapid positioning and fixation of the outlet slot accessory and the circuit breaker body, forming an integral structure after installation and improving the integrity and aesthetics of the equipment. The connection holes facilitate smooth passage of the copper busbars, simplifying the electrical connection process and reducing installation time. As a preferred option, the limiting block can be designed with a conical head and a rectangular base. When inserted into the limiting groove, the head guides alignment, and the base is fixed with an interference fit against the groove wall. Simultaneously, an insulating sleeve is provided at the edge of the connection hole to prevent wear on the copper busbars and ensure electrical safety. Another preferred option is to use a sealing gasket on the mating surface between the base plate and the circuit breaker body, and the limiting groove adopts a dovetail groove structure. After installation, rotating the base plate locks it in place. This structure provides waterproof and dustproof functionality while forming an integral structure, suitable for humid or dusty environments. Attached Figure Description

[0019] Figure 1 This is an isometric view of an embodiment of the present utility model; Figure 2 This is an exploded structural diagram of an embodiment of the present utility model; Figure 3 This is a partial enlarged view of the installation part in an embodiment of the present utility model; Figure 4 This is a partial enlarged view of the mounting groove in an embodiment of this utility model; Figure 5 This is an isometric view of the air outlet accessory of this utility model embodiment. Detailed Implementation

[0020] This utility model embodiment provides an air outlet slot accessory for a circuit breaker, as shown in the example below. Figure 1-5 The circuit breaker includes a circuit breaker body 1, which includes an operating face cover 12. An operating handle (not shown) is fixedly mounted on the operating face cover 12 for manually controlling the switching operation of the circuit breaker. The circuit breaker body 1 contains several arc-extinguishing chambers 11. These arc-extinguishing chambers 11 are standard components used in the prior art for extinguishing electric arcs, typically composed of insulating material and metal grids to rapidly cool and break the arc when the circuit breaker is opened. An venting accessory 2 works in conjunction with the circuit breaker body 1. The venting accessory 2 has several vents 21 corresponding to the number of arc-extinguishing chambers 11. The vents 21 are positioned at the top of each arc-extinguishing chamber 11 to guide the gas and heat generated during the arc-extinguishing process outwards during circuit breaker operation, preventing internal pressure buildup.

[0021] Two mounting slots 122 are symmetrically arranged on the operating cover 12, located on both sides of the operating cover 12. Two mounting blocks 22 are provided on the vent accessory 2 corresponding to the mounting slots 122. The circuit breaker body 1 and the vent accessory 2 are detachably installed through the insertion and engagement of the mounting slots 122 and the mounting blocks 22. A fixing hole 221 is provided at the center of the mounting slot 122, and a corresponding fixing hole 221 is also provided at the center of each mounting block 22. The fixing holes 221 are for fasteners such as screws or bolts to be inserted, and the vent accessory 2 is fixedly connected to the circuit breaker body 1 by tightening the fasteners. The width of the vent accessory 2 is the same as that of the operating cover 12 to ensure a neat appearance without any protruding parts after installation. A support platform 123 is also provided on the operating cover 12, which is adjacent to and engages with the mounting slots 122. When the mounting block 22 is inserted into the mounting slot 122, the mounting block 22 is completely submerged in the operating cover 12 and supported by the support platform 123.

[0022] The end face of the mounting slot 122 facing the center of the circuit breaker body 1 is a first guide arc surface 124. The mounting block 22 includes a guide portion 222, one side of which is configured as a second guide arc surface 2221. The second guide arc surface 2221 cooperates with the first guide arc surface 124 to facilitate the accurate insertion of the mounting block 22 into the mounting slot 122 during installation. The mounting block 22 also includes an abutment portion 223, the two perpendicular end faces of which abut against the two corresponding end faces of the abutment platform 123 to achieve precise positioning of the outlet slot accessory 2.

[0023] A first fastening hole 24 is provided between adjacent air passages 21 on the vent slot accessory 2. A first fastening hole 24 is also provided at the corresponding position on the circuit breaker body 1. Several first fastening holes 24 are located between two fixing holes 221, and the fixing holes 221 and the first fastening holes 24 are arranged at equal intervals on the vent slot accessory 2. The connection is further reinforced by inserting additional fasteners into the first fastening holes 24. The vent slot accessory 2 also includes a base plate 23, on which several limiting blocks 231 are provided. The circuit breaker body 1 is provided with limiting slots 13 for the limiting blocks 231 to be inserted. After the base plate 23 is installed, it cooperates with the circuit breaker body 1 to form a connecting hole 14. The connecting hole 14 is used for copper busbars to pass through. Copper busbars are common conductive connection components in the prior art and are used to transmit current in the circuit breaker.

[0024] When the circuit breaker is operated, the operating handle (not shown in the figure) is moved to control the circuit breaker to open or close the circuit. During the opening process, an electric arc is generated in the arc-extinguishing chamber 11, which is quickly extinguished by the arc-extinguishing chamber 11. The generated hot gas is discharged through the air passage 21 to prevent internal overheating or excessive pressure. The detachable installation of the vent slot accessory 2 allows users to flexibly disassemble and assemble according to the needs of the usage scenario. For example, the accessory can be removed to simplify the structure in environments where venting is not required, or the main body and accessory can be handled separately during sales. During installation, the mounting block 22 is easily inserted into the mounting slot 122 through the cooperation of the first guide arc surface 124 and the second guide arc surface 2221. The abutment part 223 abuts against the abutment platform 123 to ensure accurate positioning. The fasteners of the fixing hole 221 and the first fastening hole 24 provide multi-point fixation to prevent the vent slot accessory 2 from tilting or loosening. The limiting block 231 of the base plate 23 is inserted into the limiting slot 13 to enhance the overall stability, so that the circuit breaker body 1 and the vent slot accessory 2 form a complete unit.

[0025] The above embodiments are merely one preferred embodiment of the present utility model. Ordinary changes and substitutions made by those skilled in the art within the scope of the present utility model's technical solution are all included within the protection scope of the present utility model.

Claims

1. A gas outlet slot accessory for a circuit breaker, comprising a circuit breaker body used in conjunction with the gas outlet slot accessory, wherein the circuit breaker body has a plurality of arc-extinguishing chambers, and the gas outlet slot accessory has a plurality of gas channels corresponding to the number of arc-extinguishing chambers, wherein the gas channels are disposed at the top of the arc-extinguishing chambers, characterized in that: The circuit breaker body includes an operating face cover on which an operating handle is provided. The operating face cover is provided with a mounting groove. The vent slot accessory is provided with a mounting block corresponding to the mounting groove. The circuit breaker body and the vent slot accessory can be detachably installed through the cooperation of the mounting groove and the mounting block.

2. The vent slot accessory for a circuit breaker according to claim 1, characterized in that: The air outlet slot accessory is the same width as the operating face cover, and the mounting slots are symmetrically arranged on both sides of the operating face cover. The center of both the mounting slot and the mounting block is provided with fixing holes for fasteners to be inserted.

3. The vent slot accessory for a circuit breaker according to claim 2, characterized in that: The operating surface cover is provided with a support platform for the mounting block to abut against. The support platform cooperates with the mounting groove so that the mounting block is completely submerged in the operating surface cover.

4. The vent slot accessory for a circuit breaker according to claim 3, characterized in that: The end face of the mounting groove facing the center of the circuit breaker body is a first guide arc surface. The mounting block includes a guide portion, and one side of the guide portion is configured as a second guide arc surface that cooperates with the first guide arc surface.

5. The vent slot accessory for a circuit breaker according to claim 4, characterized in that: The mounting block also includes an abutment portion, the two perpendicular end faces of which abut against the two end faces of the abutment platform.

6. The vent slot accessory for a circuit breaker according to claim 2, characterized in that: On the air outlet slot accessory, a first fastening hole is provided at the corresponding position between adjacent air passages and the circuit breaker body. Several first fastening holes are located between two fixing holes, and the fixing holes and the first fastening holes are arranged at equal intervals on the air outlet slot accessory.

7. The vent slot accessory for a circuit breaker according to claim 1, characterized in that: The vent slot accessory also includes a base plate, on which a plurality of limiting blocks are provided. The circuit breaker body is provided with limiting slots corresponding to the limiting blocks for insertion. The base plate and the circuit breaker body cooperate to form a connection hole for copper busbars to pass through.

Images