Modularized fireproof circuit breaker

Abstract

The utility model belongs to the technical field of electrical equipment, and particularly relates to a modularized fireproof circuit breaker. Comprising a circuit breaker body, the circuit breaker body is provided with a plurality of wire connecting parts used for connecting wires, the circuit breaker further comprises a cover body covering the outer side of each wire connecting part, the circuit breaker body is provided with a plurality of clamping grooves, the cover body is provided with sliding parts clamped with the clamping grooves in a sliding mode, and the cover body is provided with wire connecting holes corresponding to the wire connecting parts; the fireproof part comprises a fireproof frame arranged on the inner side of the cover body and a plurality of fireproof capsules arranged in the fireproof frame, the fireproof frame is used for separating the fireproof capsules, and the fireproof capsules are filled with fire extinguishing media used for extinguishing fire of the wire connecting part. According to the utility model, the modularized cover body and the fireproof frame are arranged, and the cover body is provided with the sliding part which can be clamped with the circuit breaker body in a sliding manner, so that the tool-free quick disassembly and assembly of the circuit breaker cover body and the synergistic effect of a composite fire extinguishing medium are realized.

Description

A modular fire-resistant circuit breaker Technical Field

[0001] This utility model belongs to the field of electrical equipment technology, and specifically refers to a modular fireproof circuit breaker. Background Technology

[0002] Circuit breakers, as critical control and protection devices in power systems, are widely used in residential power distribution, industrial control, and other fields. Their core function is to promptly disconnect the power supply in case of overload, short circuit, or other abnormalities, ensuring electrical safety. The wire connections of a circuit breaker are critical nodes for current transmission; prolonged high-load operation or poor contact can easily generate electric arcs and high temperatures, becoming a major hazard for electrical fires. Therefore, fire-resistant design for wire connections is an important direction for improving the safety performance of circuit breakers.

[0003] In existing technologies, the fire-resistant structures of traditional circuit breakers generally suffer from low modularity. Most circuit breakers use a fixed connection between the fire-resistant structure and the circuit breaker body, requiring screwdrivers, wrenches, and other tools for disassembly, which is cumbersome and time-consuming, hindering rapid maintenance and replacement. Furthermore, existing circuit breakers with modular fire-resistant structures employ relatively simple fire-resistant methods, typically relying on a single layer of fire-resistant material or simple filling with extinguishing powder, failing to achieve the synergistic effect of different extinguishing media, resulting in low fire-resistant efficiency. Summary of the Invention

[0004] This invention addresses the problems mentioned in the background by setting up a modular cover and fireproof frame, and by providing a sliding part in the cover that can be slidably engaged with the circuit breaker body, thereby achieving tool-free quick disassembly and assembly of the circuit breaker cover and the synergistic effect of the composite fire extinguishing medium.

[0005] The purpose of this utility model is achieved as follows: a modular fireproof circuit breaker includes a circuit breaker body, the circuit breaker body having multiple wire connection portions for connecting wires, and further includes:

[0006] The cover covers the outside of each of the wire connection parts. The circuit breaker body has multiple snap-fit ​​slots. The cover has a sliding part that slidably snaps into each of the snap-fit ​​slots. The cover also has a connection hole corresponding to each of the wire connection parts.

[0007] The fireproof section includes a fireproof frame disposed inside the housing and a plurality of fireproof capsules disposed within the fireproof frame. The fireproof frame is used to separate the fireproof capsules, and the fireproof capsules are filled with a fire extinguishing medium for extinguishing fires at the wire connection parts.

[0008] The present invention is further configured such that the cover includes:

[0009] The main cover section covers the wire connection section;

[0010] An extension extends from the edge of the main cover toward the circuit breaker body and forms an enclosing structure.

[0011] The present invention is further configured such that the inner wall of the extension is provided with a wave-shaped protrusion, and the circuit breaker body is provided with a groove that matches the protrusion.

[0012] The present invention is further configured such that the cover has a double-layer structure, including an inner high-temperature resistant resin layer and an outer expanded graphite layer.

[0013] The present invention is further configured such that the sliding part includes:

[0014] The connector is located inside the cover.

[0015] An elastic fixing body is provided at the end of the connector, and the elastic fixing body is interference-fitted with the snap-fit ​​groove through elastic deformation.

[0016] The present invention is further configured such that the fireproof frame has a honeycomb structure, comprising:

[0017] The main frame is fixed inside the cover.

[0018] The partitions are arranged in a grid pattern, dividing the main frame into multiple fire extinguishing chambers for accommodating the fireproof capsule.

[0019] The present invention is further configured such that the fireproof capsule comprises:

[0020] The first capsule is filled with a fire extinguishing medium to suppress electric arcs;

[0021] The second capsule is filled with extinguishing medium for extinguishing electrical fires;

[0022] The first capsule and the second capsule are alternately distributed in the fire extinguishing chamber.

[0023] By adopting the above technical solution, the beneficial effects that this utility model can achieve are:

[0024] 1. The interference fit between the elastic fixing body of the sliding part of the cover and the snap-fit ​​groove of the circuit breaker body enables tool-free quick assembly and disassembly of the cover; at the same time, the fireproof frame with honeycomb structure can be disassembled independently, making it easy to replace the failed fireproof capsule, which significantly improves the modularity and maintenance convenience of the fireproof structure of the circuit breaker.

[0025] 2. By utilizing the alternating distribution of the first and second capsules in the fire extinguishing chamber, combined with the synergistic effect of different fire extinguishing media, layered prevention and control of electric arcs and open flames can be achieved; in the double-layer fireproof structure, the expanded graphite layer expands and fills the gaps when heated, and the high-temperature resistant resin layer blocks heat, forming a composite fire barrier, which effectively improves fire protection efficiency.

[0026] 3. The wavy protrusions on the inner wall of the cover extension are adapted to the groove of the circuit breaker body to form a labyrinth-like sealing structure. Combined with the elastic snap-fit ​​of the sliding part, it enhances the connection stability between the cover and the circuit breaker body, avoids loosening due to vibration and thermal expansion and contraction, and ensures the integrity and sealing of the fireproof layer. Attached Figure Description

[0027] Figure 1 is a three-dimensional structural diagram of this utility model;

[0028] Figure 2 is an exploded view of this utility model;

[0029] Figure 3 is a top view of the cover of this utility model;

[0030] Figure 4 is a structural schematic diagram of the fireproof frame of this utility model.

[0031] The reference numerals in the figure are as follows: 1. Circuit breaker body; 10. Wire connection part; 2. Cover; 20. Main cover; 21. Extension part; 3. Snap-fit ​​groove; 4. Sliding part; 40. Connector; 41. Elastic fixing body; 5. Connection hole; 6. Fireproof part; 60. Fireproof frame; 600. Main frame body; 601. Partition; 602. Fire extinguishing chamber; 61. Fireproof capsule; 610. First capsule; 611. Second capsule; 7. Protrusion; 8. Groove. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, see Figures 1-4:

[0033] Example 1:

[0034] This embodiment provides a modular fireproof circuit breaker, including a circuit breaker body 1, the circuit breaker body 1 having multiple wire connection portions 10 for connecting wires, and further including:

[0035] Cover 2 covers the outside of each of the wire connection parts 10. The circuit breaker body 1 has a plurality of snap-fit ​​grooves 3. The cover 2 has a sliding part 4 that is slidably snap-fitted with each of the snap-fit ​​grooves 3. The cover 2 also has a connecting hole 5 corresponding to each of the wire connection parts 10.

[0036] The fireproof section 6 includes a fireproof frame 60 disposed inside the cover 2 and a plurality of fireproof capsules 61 disposed within the fireproof frame 60. The fireproof frame 60 is used to separate the fireproof capsules 61, and the fireproof capsules 61 are filled with a fire extinguishing medium for extinguishing the fire on the wire connection section 10.

[0037] The wire connection part 10 is used to realize the electrical connection between the external wire and the internal circuit of the circuit breaker and to transmit current. The wire connection part 10 is generally composed of bolt-type or plug-in type terminals and conductors, and is located on the side or top of the circuit breaker body 1, usually in multiple rows.

[0038] The cover 2 is used to cover the wire connection portion 10 and provide a physical fire barrier for the wire connection portion 10. When the wire connection portions 10 are arranged side by side on the side of the circuit breaker body 1, the cover 2 is generally a plate-shaped structure that matches the side profile of the circuit breaker body 1. The cover 2 is slidably connected to the body locking groove 3 via the sliding portion 4.

[0039] The snap-fit ​​groove 3 engages with the sliding part 4 of the cover 2 to achieve a detachable connection between the cover 2 and the circuit breaker body 1. The snap-fit ​​groove 3 is a groove 8 formed on the surface of the circuit breaker body 1 and adapted to the sliding part 4.

[0040] The sliding part 4 is used to guide the installation path of the cover 2 and provide a fixing force.

[0041] The power supply cable passes through the connection hole 5 and connects to the connector. It is a circular or elliptical hole opened on the cover 2.

[0042] The fireproof section 6 is used to separate and fix the fireproof capsule 61 to ensure that the extinguishing medium can be released in an orderly manner when a fire occurs.

[0043] The fire-resistant capsule 61 is used to seal and store extinguishing media. In the event of a fire, it ruptures upon triggering by temperature or pressure, releasing the extinguishing media to extinguish the fire at the electrical connection 10. The fire-resistant capsule 61 is a small, sealed container, typically consisting of a fragile outer shell and an internal filling of extinguishing media. The outer shell has a uniform thickness to ensure reliable rupture under a set temperature or pressure. The fire-resistant capsule 61 is commonly spherical, cylindrical, or other shapes that facilitate filling and installation.

[0044] Example 2:

[0045] This embodiment provides a modular fire-resistant circuit breaker, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0046] The cover 2 includes:

[0047] The main cover 20 covers the wire connection portion 10;

[0048] The extension 21 extends from the edge of the main cover 20 toward the circuit breaker body 1 and forms an enclosing structure.

[0049] The design of the main cover 20 and the extension 21 is intended to construct a comprehensive and robust protection system for the wire connection portion 10 of the circuit breaker. The main cover 20 directly covers the wire connection portion 10, providing basic physical protection, isolating the connection portion from external dust, moisture, and other corrosive substances, while initially blocking heat and flames in the event of a fire. The extension 21 further enhances the sealing and connection stability between the cover 2 and the circuit breaker body 1, preventing flames, smoke, and high-temperature gases from leaking or entering through the gaps between them in the event of a fire, thus comprehensively improving the fire resistance and operational safety of the circuit breaker.

[0050] The main cover 20 and the extension 21 are integrally molded to ensure the integrity and stability of the structure. The main cover 20 is adapted to the shape of the wire connection part 10 in a box or cap shape, completely enclosing the connection part; the extension 21 extends from the edge of the main cover 20 in a ring or strip shape towards the circuit breaker body 1, forming an enclosing structure by tightly fitting the surface of the circuit breaker body 1. The extension 21 and the circuit breaker body 1 can be slidably engaged by the elastic fixing body 41 of the sliding part 4 and the snap-fit ​​groove 3. This connection method facilitates the quick installation and removal of the cover 2 and provides reliable fixing force after installation, ensuring that the cover 2 and the circuit breaker body 1 are tightly connected, effectively improving the sealing effect and connection firmness.

[0051] Example 3:

[0052] This embodiment provides a modular fire-resistant circuit breaker, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0053] The inner wall of the extension 21 is provided with a wave-shaped protrusion 7, and the circuit breaker body 1 is provided with a groove 8 that matches the protrusion 7.

[0054] The design of the wavy protrusion 7 on the inner wall of the extension 21 and the groove 8 of the circuit breaker body 1 is intended to significantly improve the sealing performance between the enclosure 2 and the circuit breaker body 1 by increasing the complexity and tortuosity of the sealing path. The wavy protrusion 7 and the groove 8 interlock to form a labyrinthine sealing structure. When a fire occurs, this structure can effectively extend the penetration path of flames, smoke, and high-temperature gases, increasing their diffusion resistance. At the same time, the tiny gap between the protrusion 7 and the groove 8 forms an air insulation layer, further blocking heat transfer, thereby maximizing the prevention of the movement of external flames and internal smoke, ensuring the fire-resistant environment inside the enclosure 2, and improving the reliability and safety of the circuit breaker in a fire.

[0055] Example 4:

[0056] This embodiment provides a modular fire-resistant circuit breaker, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0057] The cover 2 has a double-layer structure, including an inner high-temperature resistant resin layer and an outer expanded graphite layer.

[0058] The enclosure 2 employs a dual-layer structure design consisting of a high-temperature resistant resin layer and an expanded graphite layer. This design leverages the complementary properties of the two materials to construct a multi-layered protection system. The inner high-temperature resistant resin layer, with its high heat resistance and mechanical strength, maintains structural stability in high-temperature fire environments, preventing deformation and collapse of the enclosure 2 and providing reliable physical support for the internal fire-resistant components. The outer expanded graphite layer, utilizing its rapid expansion upon heating, increases in volume during a fire to form a dense heat-insulating barrier, filling the gap between the enclosure 2 and the circuit breaker body 1 and blocking the path of flame and heat conduction. The combined effect of these two layers ensures the integrity of the enclosure 2 itself, significantly improves the heat insulation and fireproofing effect on the wire connection portion 10, and also resists external mechanical impacts and environmental corrosion, comprehensively enhancing the safety and durability of the circuit breaker.

[0059] Example 5:

[0060] This embodiment provides a modular fire-resistant circuit breaker, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0061] The sliding part 4 includes:

[0062] Connector 40 is located inside the cover 2;

[0063] An elastic fixing body 41 is provided at the end of the connector 40, and the elastic fixing body 41 is press-fitted with the snap-fit ​​groove 3 through elastic deformation.

[0064] The sliding part 4 employs a connecting body 40 and an elastic fixing body 41 to achieve a convenient and stable connection between the enclosure 2 and the circuit breaker body 1. On the one hand, this design allows the enclosure 2 to be installed and removed without the need for additional tools, significantly improving equipment maintenance efficiency. On the other hand, through the cooperation of the elastic fixing body 41 and the snap-fit ​​groove 3, it ensures that the enclosure 2 maintains a stable connection under extreme conditions such as normal operation, vibration environment, and even fire, preventing it from falling off and causing protection failure, thereby ensuring the reliable operation and fire resistance performance of the circuit breaker.

[0065] The connector 40 can be rod-shaped or plate-shaped, vertically fixed inside the cover 2, serving as a rigid component connecting the elastic fixing body 41 and the cover 2. The elastic fixing body 41 is located at the end of the connector 40 and is designed in a special shape such as a hook or L-shape, possessing good elastic deformation capability. During installation, the elastic fixing body 41 is aligned with the snap-fit ​​groove 3 on the circuit breaker body 1 and inserted. During insertion, the elastic fixing body 41 is pressed and bends inward, undergoing elastic deformation. When it slides to a specific position in the snap-fit ​​groove 3, the elastic fixing body 41 rebounds outward due to elastic restoring force, tightly fitting against the inner wall of the snap-fit ​​groove 3, forming an interference fit, and achieving a firm snap-fit. During disassembly, pressing the elastic fixing body 41 to deform it again releases the snap-fit ​​state, completing the disassembly of the cover 2. The entire process is simple to operate and the connection is stable.

[0066] Example 6:

[0067] This embodiment provides a modular fire-resistant circuit breaker, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0068] The fireproof frame 60 has a honeycomb structure, including:

[0069] The main frame 600 is fixed inside the cover 2;

[0070] The partition 601 is arranged in a grid pattern, and the partition 601 divides the main frame 600 into multiple fire extinguishing chambers 602 for accommodating the fireproof capsule 61.

[0071] The fireproof frame 60 adopts a honeycomb structure and is designed by combining the main frame 600 and the partition 601 to achieve the orderly installation of the fireproof capsules 61 and the efficient release of the extinguishing agent. On the one hand, this structure can precisely separate the fireproof capsules 61, avoiding interference between different extinguishing agents and ensuring that the extinguishing agent can be released as needed in the event of a fire. On the other hand, by optimizing space utilization and structural strength, the overall weight is reduced while enhancing the stability of the fireproof frame 60 in high-temperature environments, thereby improving the overall fireproof reliability and practicality of the circuit breaker.

[0072] The main frame 600 can be a plate-like structure adapted to the inner space of the enclosure 2, and is tightly fixed to the inner wall of the enclosure 2 by snap-fit, adhesive, or embedded structure, serving as the basic frame for supporting the partitions 601 and the fireproof capsule 61. The partitions 601 are distributed in a grid pattern within the main frame 600, with their edges perpendicular to each other or intersecting at a 60-degree angle, forming regular hexagonal or quadrilateral fire extinguishing chambers 602. This shape design not only maximizes the use of space but also evenly distributes pressure under stress, improving the overall strength of the frame. The partitions 601 and the main frame 600 are firmly connected by an integral molding process or by welding, riveting, etc., ensuring that each fire extinguishing chamber 602 is independent and stable, providing a reliable installation space and protective barrier for the fireproof capsule 61.

[0073] Example 7:

[0074] This embodiment provides a modular fire-resistant circuit breaker, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0075] The fireproof capsule 61 includes:

[0076] The first capsule 610 is filled with a fire extinguishing medium to suppress electric arcs;

[0077] The second capsule 611 is filled with a fire extinguishing medium for extinguishing electrical fires;

[0078] The first capsule 610 and the second capsule 611 are alternately distributed in the fire extinguishing chamber 602.

[0079] The fireproof capsule 61 employs an alternating design of a first capsule 610 and a second capsule 611, aiming to construct a phased, multi-layered fire prevention and control system. Electrical fires typically involve two stages: arc generation and open flame combustion. The arc-suppressing medium in the first capsule 610 weakens the arc energy during the initial fire stage, reducing the likelihood of it igniting into an open flame. The fire-extinguishing medium in the second capsule 611 targets an already formed open flame, rapidly isolating oxygen and lowering the temperature to extinguish it. The alternating distribution of the two capsules ensures that when an arc or open flame occurs at any location on the wire connection 10, a corresponding fire-extinguishing medium can respond rapidly. Through this relay and synergistic effect, the overall fire suppression capability is significantly enhanced, minimizing fire hazards and ensuring the safety of the circuit breaker and surrounding equipment.

[0080] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A modular fireproof circuit breaker, comprising a circuit breaker body (1), the circuit breaker body (1) having a plurality of wire connection portions (10) for connecting wires, characterized in that, Also includes: The cover (2) covers the outside of each of the wire connection parts (10). The circuit breaker body (1) has multiple snap-fit ​​slots (3). The cover (2) has a sliding part (4) that is slidably snap-fitted to each of the snap-fit ​​slots (3). The cover (2) also has a wiring hole (5) corresponding to each of the wire connection parts (10). The fireproof part (6) includes a fireproof frame (60) located inside the cover (2) and several fireproof capsules (61) located inside the fireproof frame (60). The fireproof frame (60) is used to separate the fireproof capsules (61). The fireproof capsules (61) are filled with a fire extinguishing medium for extinguishing the fire of the wire connection parts (10).

2. A modular fire-resistant circuit breaker according to claim 1, characterized in that, The cover (2) includes: a main cover (20) covering the wire connection part (10); and an extension (21) extending from the edge of the main cover (20) toward the circuit breaker body (1) and forming an enclosing structure.

3. A modular fire-resistant circuit breaker according to claim 2, characterized in that, The inner wall of the extension (21) is provided with a wave-shaped protrusion (7), and the circuit breaker body (1) is provided with a groove (8) that matches the protrusion (7).

4. A modular fire-resistant circuit breaker according to claim 1, characterized in that, The cover (2) has a double-layer structure, including an inner high-temperature resistant resin layer and an outer expanded graphite layer.

5. A modular fire-resistant circuit breaker according to claim 1, characterized in that, The sliding part (4) includes: a connecting body (40) located inside the cover (2); and an elastic fixing body (41) located at the end of the connecting body (40). The elastic fixing body (41) is in interference fit with the snap-fit ​​groove (3) through elastic deformation.

6. A modular fire-resistant circuit breaker according to claim 1, characterized in that, The fireproof frame (60) has a honeycomb structure and includes: a main frame body (600) fixed inside the cover (2); and a partition body (601) distributed in a grid pattern, wherein the partition body (601) divides the main frame body (600) into multiple fire extinguishing chambers (602) for accommodating the fireproof capsule (61).

7. A modular fire-resistant circuit breaker according to claim 6, characterized in that, The fireproof capsule (61) includes: a first capsule (610) filled with a fire extinguishing medium for suppressing electric arcs; and a second capsule (611) filled with a fire extinguishing medium for extinguishing electrical fires; wherein the first capsule (610) and the second capsule (611) are alternately distributed in the fire extinguishing chamber (602).

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