An arc chute

Abstract

The utility model belongs to the technical field of electrical equipment, specifically disclose a arc separation device, circuit breaker body, external cover and single pole independent setting arc extinguishing cover. Arc extinguishing cover tightly covers each phase arc extinguishing chamber top, forms independent closed space, and is equipped with exhaust hole and baffle structure and guides residual arc safe discharge. Through sealing structure one, sealing structure two realizes phase and upper and lower end surface sealing, blocks charged particle diffusion path, prevents phase short circuit. Arc extinguishing cover, exhaust hole, baffle structure, sealing structure one and sealing structure two jointly constitute single phase independent arc separation channel, make each phase arc extinguishing chamber's external space mutually isolated. The device is compatible fixed type and drawer type installation, and the structure is modular, can be adapted to different pole number circuit breaker, can effectively isolate single phase arc extinguishing chamber's external space, makes each phase external space independent, isolated communication.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and in particular to an arc-blocking device. Background Technology

[0002] When a circuit breaker breaks, the electric arc generated between the contacts is extinguished by the arc-extinguishing chamber, and residual gas is discharged from the end of the chamber. This residual gas typically contains a large number of charged particles and high-temperature ionized molten metal slag, which significantly reduces the insulation performance of the surrounding space. Especially when the circuit breaker breaks a large current at a high voltage, a residual arc still possessing some energy may even be discharged from the end of the arc-extinguishing chamber. For universal circuit breakers, the arc-extinguishing chambers are usually arranged densely side-by-side at the top of the circuit breaker. In this case, if a large number of charged particles, ionized molten metal slag, or residual arc are discharged from the top, the insulation strength between the phase arc-extinguishing chambers will decrease sharply, easily inducing phase-to-phase short circuits and causing breaking failure.

[0003] The existing casing assembly structure at the top of the arc-extinguishing chamber of universal circuit breakers makes it difficult to effectively isolate the external spaces of each phase's arc-extinguishing chamber. In drawer-type universal circuit breakers, the need for the circuit breaker body to be rocked in and out of the drawer for connection / disconnection operations further exacerbates the technical difficulty of isolating the external spaces of each phase's arc-extinguishing chamber. Currently, the external spaces of each phase's arc-extinguishing chamber are essentially still connected. During the breaking process, if residual arcs or charged particles escape from two or more phases' arc-extinguishing chambers and enter this connected space, it can easily trigger phase-to-phase arc breakdown, leading to a phase-to-phase short circuit.

[0004] To overcome the above-mentioned defects, this application provides an arc-blocking device. Utility Model Content

[0005] The purpose of this invention is to provide an arc-extinguishing device to solve the problems existing in the prior art. Without changing the external dimensions of the circuit breaker, the arc-extinguishing housing is fixed to the outer housing, isolating the external space of the arc-extinguishing chamber. Simultaneously, a reasonable vent is designed to allow residual arcs and charged particles escaping from the arc-extinguishing chamber to circulate and dissipate inside the arc-extinguishing housing before being discharged through the vent, significantly reducing the risk of phase-to-phase short circuits outside the arc-extinguishing chamber during circuit breaker breaking. This device adopts a single-pole independent arc-extinguishing housing design, adaptable to universal circuit breakers with different pole numbers, and compatible with both fixed and drawer-type installation methods. This design ensures effective isolation while also offering advantages in installation convenience and cost-effectiveness.

[0006] To achieve the above objectives, this utility model provides the following solution:

[0007] An arc-quenching device includes a circuit breaker body and an outer casing. The circuit breaker body has several arc-quenching chambers arranged in parallel. Each arc-quenching casing is independently installed outside each phase arc-quenching chamber, with its edges tightly fitted to the upper surfaces of the outer casing and the arc-quenching chambers, respectively, independently sealing the external space of the arc-quenching chambers. An exhaust port is opened at the top of the arc-quenching casing and penetrates the outer casing to discharge residual electric arcs and charged particles. A baffle structure is provided on both sides of the exhaust port to constrain the airflow direction and prevent phase-to-phase short circuits. A sealing structure one and a sealing structure two are provided. The sealing structure one is provided in the mounting groove of adjacent arc-quenching casings to enhance the phase-to-phase sealing effect, and the sealing structure two is provided on the side of the arc-quenching casing that is in contact with the upper surface of the arc-quenching chamber to ensure the internal space is sealed. The arc-quenching casing, exhaust port, baffle structure, sealing structure one, and sealing structure two together constitute a single-phase independent arc-quenching channel, isolating the external spaces of each phase arc-quenching chamber from each other.

[0008] Optionally, the outer casing can be a fixed outer casing or a drawer-type outer casing, respectively adapted to circuit breakers that are installed in a fixed manner or in a drawer-type manner.

[0009] Optionally, one side of the outer casing is provided with an elongated hole corresponding to the position of the vent hole, and both the vent hole and the elongated hole are vertical waist-shaped hole structures, which are used to reduce the risk of phase-to-phase short circuits caused by electric arcs.

[0010] Optionally, when the outer cover is a fixed outer cover, the distance between its inner wall and the exhaust hole is ≥10mm.

[0011] Optionally, when the outer cover is a drawer-type outer cover, the distance between its inner wall and the vent is >30mm.

[0012] Optionally, the drawer-type outer cover is fixed by a drawer bracket, and when the circuit breaker body slides in, the upper surface of the arc-extinguishing chamber automatically fits into the sealing structure.

[0013] Optionally, the outer surfaces of both sides of the arc-extinguishing cover are provided with mounting grooves, and the sealing structure is embedded in the mounting grooves and forms a surface seal with the outer shell.

[0014] Optionally, the baffle structure extends outward to constrain the airflow direction and prevent residual arc deflection.

[0015] Optionally, both the sealing structure one and the sealing structure two are made of flexible insulating material.

[0016] Optionally, the wall thickness of the arc-extinguishing cover at the location of the exhaust port is increased to increase the depth of the exhaust port and constrain the airflow direction.

[0017] Compared with the prior art, the present invention discloses at least the following beneficial effects:

[0018] This invention proposes an arc-isolating device for universal circuit breakers, compatible with both fixed and drawer-type installations. Its modular structure allows it to adapt to circuit breakers with different pole numbers. It effectively isolates the external space of a single-phase arc-extinguishing chamber, ensuring that the external spaces of each phase are independent and interconnected. Simultaneously, this device separates the circuit breaker's metal casing and other adjacent metal components from the external space of the arc-extinguishing chamber, thereby preventing residual arcs from puncturing the external space and fundamentally eliminating the risk of phase-to-phase short circuits. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the arc-breaking circuit breaker structure including the arc-extinguishing chamber in this embodiment;

[0021] Figure 2 The isometric mounting of the single-phase arc-extinguishing cover in the arc-isolating device of this embodiment is shown. Figure 1 ;

[0022] Figure 3 The isometric mounting of the single-phase arc-extinguishing cover in the arc-isolating device of this embodiment is shown. Figure 2 ;

[0023] Figure 4 The isometric mounting of the multiphase arc-extinguishing cover in the arc-isolating device of this embodiment is shown. Figure 1 ;

[0024] Figure 2 The isometric mounting of the multiphase arc-extinguishing cover in the arc-isolating device of this embodiment is shown. Figure 6 ;

[0025] Figure 7 This is a schematic diagram of the multiphase arc-extinguishing cover assembly installation in the arc-isolating device of this embodiment;

[0026] Figure 8 This is a schematic diagram of the fixed-installation circuit breaker structure in the arc-blocking device of this embodiment;

[0027] Figure 9 This is a cross-sectional axonometric view of the arc-extinguishing housing of the fixed-mount circuit breaker in the arc-extinguishing device of this embodiment;

[0028] Figure 10 This is a cross-sectional view of the arc-extinguishing housing of the circuit breaker in the arc-breaking device of this embodiment;

[0029] Figures 1 to 6 This is a schematic diagram of the drawer-type arc-blocking device for the circuit breaker in this embodiment.

[0030] In the diagram: 1. Outer casing; 2. Arc-extinguishing chamber; 3. Alternating outer shells; 4. Arc-extinguishing casing; 5. Sealing structure one; 6. Mounting hole; 7. Vent hole; 8. Baffle structure; 9. Sealing structure two; 10. Fixed outer casing; 11. Screw; 12. Elongated hole; 13. Drawer-type outer casing; 14. Circuit breaker body; 15. Mounting slot. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] The purpose of this invention is to provide an arc-isolating device to overcome the aforementioned deficiencies in the prior art. The device, without altering the original dimensions of the circuit breaker, effectively isolates the external space of each phase's arc-extinguishing chamber by fixing the arc-extinguishing housing inside the outer casing. Simultaneously, vent holes are strategically placed on the arc-extinguishing housing, allowing residual arcs and charged particles escaping from the arc-extinguishing chamber to circulate and attenuate their energy within the housing before being safely discharged through the vent holes. This design significantly reduces or even eliminates the risk of phase-to-phase short circuits caused by the diffusion of residual ionized gas or arcs in the external space of the arc-extinguishing chamber during circuit breaker disconnection.

[0033] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Reference Figures 7 to 10 As shown, this utility model provides an arc-extinguishing device, including a circuit breaker body 14, which includes an outer casing 1 and a plurality of arc-extinguishing chambers 2. Each arc-extinguishing chamber 2 is provided with an arc-extinguishing cover 4 on its exterior. The edges of the arc-extinguishing cover 4 are tightly fitted to the upper surfaces of the outer casing 1 and the arc-extinguishing chamber 2, respectively, to independently seal the external space of each phase arc-extinguishing chamber 2, ensuring that the external spaces of each phase are isolated from each other and preventing communication.

[0035] Specifically, such as Figure 2 As shown, the top of the arc-extinguishing cover 4 is provided with a mounting hole 6, which is fixed to the outer cover 1 on the top of the circuit breaker by screws 11.

[0036] In this embodiment, the outer cover 1 can be a fixed outer cover 10 or a drawer-type outer cover 13.

[0037] The outer casing 1 (fixed outer casing 10 or drawer-type outer casing 13) has an elongated hole 12 on one side, and the arc-extinguishing casing 4 has an exhaust hole 7, corresponding to the position of the elongated hole 12 of the outer casing 1, for discharging residual electric arc and charged particles. Outwardly extending baffle structures 8 are provided on both sides of the exhaust hole 7 to prevent phase-to-phase short circuits caused by charged particles or electric arcs discharged from different phase poles, specifically as follows... Figure 4 and Figure 2 As shown.

[0038] In this embodiment, both the exhaust hole 7 and the elongated hole 12 adopt a vertical waist-shaped hole structure, which can reduce the risk of short circuit between the electric arc and the external phase of the arc extinguishing chamber 2.

[0039] Furthermore, the wall thickness of the arc-extinguishing cover 4 at the location of the exhaust hole 7 is increased to increase the depth of the exhaust hole 7 and constrain the airflow direction.

[0040] Furthermore, the arc-extinguishing cover 4 has several reinforcing ribs inside to enhance the overall strength of the arc-extinguishing cover 4.

[0041] like Figure 8 and Figure 3 As shown, the outer surfaces of both sides of the arc-extinguishing housing 44 have mounting grooves 15. When multi-pole arc-extinguishing housings 4 are arranged, the mounting grooves 15 of adjacent arc-extinguishing housings 4 are provided with sealing structures 5 made of flexible insulating material, which are fitted with the outer shells 3 alternately to enhance the interphase sealing effect. After the arc-extinguishing housings 4 are installed in the circuit breaker, the sealing structures 5 are fitted with the outer shells 3 alternately to enhance the interphase sealing effect of the external space of the arc-extinguishing chamber 2, further preventing the external space from connecting with each other, and preventing charged particles or arcs from entering the internal space of different arc-extinguishing housings 4 and causing interphase short circuits.

[0042] like Figure 8 and Figures 7 to 9 As shown, the arc-extinguishing cover 4 and the upper surface of the arc-extinguishing chamber 2 are fitted with a sealing structure 9, which is made of flexible insulating material to ensure the internal space is sealed and prevent charged particles or arcs from escaping.

[0043] The sealing structure 5 and sealing structure 9 ensure that the internal space of the arc-extinguishing cover 4 is sealed, so that the gas, charged particles or electric arc discharged from the arc-extinguishing chamber 2 can only be discharged through the exhaust port 7.

[0044] In one specific embodiment, such as Figure 10 As shown, when the circuit breaker is installed in a fixed manner, the arc-extinguishing cover 4 of each phase is fixed together with the fixed outer cover 10 by screws 11. The fixed outer cover 10 is fixedly installed to the circuit breaker body 14. The arc-extinguishing cover 4 independently seals the external space of the arc-extinguishing chamber 2 of each phase, leaving only the exhaust port 7 connected to the external space.

[0045] In another specific embodiment, such asFigure 4 As shown, when the circuit breaker adopts a drawer-type installation method, the arc-extinguishing housing 4 of each phase is fixed to the drawer-type outer housing 13, and the drawer-type outer housing 13 is fixed to the drawer bracket. When the circuit breaker body 14 slides into the drawer along the direction of movement, the upper surface of the arc-extinguishing chamber 2 is in contact with the sealing structure 9, and the sealing structure 5 is in contact with the outer shell 3. Finally, the arc-extinguishing chamber 2 of each phase slides into the arc-extinguishing housing 4, reaching... Figure 5 and Figure 9 At the location shown, the arc-extinguishing cover 4 independently seals the external space of the arc-extinguishing chamber 2 corresponding to each phase, leaving only the exhaust port 7 connected to the external space.

[0046] The working principle of this embodiment is as follows: ​ As shown, when the circuit breaker trips, the high-temperature gas, metal residue, and residual electric arc (or charged particles) discharged from the upper part of the arc-extinguishing chamber 2 enter the internal space of the arc-extinguishing housing 4. They circulate and cool in the enclosed environment, and after their energy is significantly reduced, they are discharged through the exhaust port 7. The depth design of the exhaust port 7 and the baffle structure 8 further constrain the airflow direction to prevent phase-to-phase short circuits. The distance between the inner wall of the fixed outer housing 10 and the exhaust port 7 is ≥10mm, and the distance between the inner wall of the drawer-type outer housing 13 and the exhaust port 7 is >30mm, to prevent residual electric arc from puncturing the metal housing.

[0047] When a drawer-type installation method is used, the working principle is the same as above. Since the distance between the inner wall of the drawer-type outer cover 13 and the exhaust port 77 is relatively large, usually >30mm, the possibility of residual electric arc breaking down the drawer-type outer cover 13 made of metal material can be disregarded. The baffle structure 8 can also constrain the airflow direction and prevent residual electric arc from deflecting and causing phase-to-phase short circuits.

[0048] In this embodiment, the arc-extinguishing enclosure 4 adopts a single-pole independent modular structure. By assembling different quantities, it can be applied to circuit breakers with different numbers of poles and is compatible with both fixed and drawer-type installation methods. It independently seals the external space of the arc-extinguishing chamber 2, constrains the direction of exhaust airflow, reduces residual arc energy, reduces arc distance, and prevents phase-to-phase short circuits in the circuit breaker. This structural design ensures reliable isolation function while also offering convenient installation and good cost-effectiveness.

[0049] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "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 accompanying drawings. They are only for the convenience of describing this utility model 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 utility model.

[0050] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. An arc-blocking device, characterized in that, include: The circuit breaker body (14) and the outer casing (1) are provided with a plurality of arc-extinguishing chambers (2) arranged in parallel on the circuit breaker body (14); The arc-extinguishing cover (4) is independently set outside each phase arc-extinguishing chamber (2), and its edges are tightly fitted to the upper surfaces of the outer cover (1) and the arc-extinguishing chamber (2) respectively, so as to independently seal the external space of the arc-extinguishing chamber (2). The exhaust port (7) is located at the top of the arc-extinguishing cover (4) and extends through the outer cover (1) to discharge residual electric arc and charged particles.

2. The arc-blocking device according to claim 1, characterized in that, Also includes: A baffle structure (8) is provided on both sides of the exhaust hole (7). The baffle structure (8) extends outward to constrain the airflow direction and prevent phase-to-phase short circuits.

3. The arc-blocking device according to claim 2, characterized in that, Also includes: Sealing structure one (5) and sealing structure two (9), wherein sealing structure one (5) is provided in the mounting groove (15) of the adjacent arc extinguishing shell (4), and sealing structure two (9) is provided on the side of the arc extinguishing shell (4) that is in contact with the upper surface of the arc extinguishing chamber (2); The arc-extinguishing cover (4), exhaust port (7), baffle structure (8), sealing structure one (5) and sealing structure two (9) together constitute a single-phase independent arc-isolating channel, which isolates the external space of each phase arc-extinguishing chamber (2) from each other.

4. The arc-blocking device according to any one of claims 1 to 3, characterized in that, The outer casing (1) is either a fixed outer casing (10) or a drawer-type outer casing (13), which are respectively adapted to circuit breakers that are installed in a fixed or drawer-type manner.

5. The arc-blocking device according to any one of claims 1 to 3, characterized in that, The outer cover (1) has an elongated hole (12) on one side corresponding to the position of the exhaust hole (7), and both the exhaust hole (7) and the elongated hole (12) are vertical waist-shaped hole structures.

6. The arc-blocking device according to claim 4, characterized in that, When the outer cover (1) is a fixed outer cover (10), the distance between its inner wall and the exhaust hole (7) is ≥10mm; when the outer cover (1) is a drawer-type outer cover (13), the distance between its inner wall and the exhaust hole (7) is >30mm.

7. The arc-blocking device according to claim 6, characterized in that, The drawer-type outer cover (13) is fixed by a drawer bracket. When the circuit breaker body (14) slides in, the upper surface of the arc-extinguishing chamber (2) automatically fits with the sealing structure II (9).

8. The arc-blocking device according to claim 3, characterized in that, The arc-extinguishing cover (4) has mounting grooves (15) on both outer surfaces. The sealing structure (5) is embedded in the mounting grooves (15) and forms a surface seal with the outer shell (3).

9. The arc-blocking device according to claim 3 or 8, characterized in that, Both the sealing structure one (5) and the sealing structure two (9) are made of flexible insulating material.

10. The arc-blocking device according to claim 1, characterized in that, The wall thickness of the arc-extinguishing cover (4) at the location of the exhaust hole (7) is increased to increase the depth of the exhaust hole (7) and constrain the airflow direction.

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