A powerful gas arc extinguishing device

Abstract

This utility model discloses a forced gas arc extinguishing device, including an arc extinguishing chamber and an isolation gas generating hood installed in an interphase channel. The isolation gas generating hood is located on one side of the opening of the arc extinguishing chamber and includes two isolation components symmetrically arranged and forming an arc-running channel between them. Two first limiting grooves are formed between the front end of the arc extinguishing grid assembly and the two partitions, which are aligned with the opening direction of the arc extinguishing chamber. The two isolation components have two first insertion parts that are inserted into the first limiting grooves, and two second limiting grooves are arranged opposite each other on both sides of the interphase channel. The two isolation components are correspondingly provided with two second insertion parts that are inserted into the second limiting grooves. The isolation gas generating hood using this technical solution forms an integral rigid structure with the arc extinguishing chamber and the interphase channel through bidirectional limiting and multi-part insertion, which significantly improves the impact resistance and installation reliability, ensures arc extinguishing stability, and improves the service life and breaking capacity of the circuit breaker.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, specifically to a powerful gas arc extinguishing device. Background Technology

[0002] In the field of low-voltage circuit breakers, these molded case circuit breakers typically have an arc-extinguishing chamber inside to extinguish the electric arc generated by the contacts in electrical equipment, ensuring the safe operation of the electrical equipment. As the core arc-extinguishing component of the circuit breaker, the arc-extinguishing chamber uses metal grids arranged inside to extinguish the arc generated when interrupting current through cutting and cooling. To improve arc-extinguishing efficiency, a gas-generating hood (commonly made of high-temperature resistant engineering plastics such as polyamide) is usually installed at the opening of the arc-extinguishing chamber. Existing common gas-generating hoods are directly fitted onto the opening of the arc-extinguishing chamber, forming a semi-enclosed space. The main body covers the front end of the arc-extinguishing chamber and encloses one end of the metal grids, with gas-generating plates extending from both sides with stepped flared openings, forming a channel in the middle for the moving contact to enter. When the high temperature of the electric arc acts on the inner wall of the gas-generating hood, the material thermally decomposes to generate high-pressure gas, which is directionally sprayed through the flared openings to accelerate the arc's entry into the arc-extinguishing grids. Although the arc-extinguishing chamber can enhance its arc-extinguishing capability by setting up the gas-generating hood with the above-mentioned structure, the following problems still exist in practical applications: the installation strength and structural reliability of the existing gas-generating hood are insufficient. When the circuit breaker interrupts a large current, the high-temperature and high-pressure gas generated in the arc-extinguishing chamber accumulates in the enclosed space and will impact the inner wall of the gas-generating hood directly. Repeated impacts can easily cause the gas-generating plate to deform or loosen or even detach from the connection with the arc-extinguishing chamber. The stability of the installation structure needs to be strengthened and improved. Utility Model Content

[0003] Therefore, the technical problem to be solved by this utility model is to overcome the problem that the installation strength and structural reliability of the gas generating hood and the arc extinguishing chamber in the prior art are insufficient, and that the connection between the gas generating hood and the arc extinguishing chamber is easily loosened or even detached when subjected to repeated impacts of high-pressure gas.

[0004] To solve the above problems, this utility model provides a forced gas arc extinguishing device, installed in the phase-to-phase channel of a circuit breaker, comprising: The arc-extinguishing chamber includes an arc-extinguishing cavity formed by two opposing partitions and an arc-extinguishing grid assembly stacked in the arc-extinguishing cavity; An isolation gas generation hood is installed on one side of the opening of the arc-extinguishing chamber. It includes two symmetrically arranged isolation components that form an arc-running channel between the two components. The two isolation components cooperate with two partitions to cover the front end of the arc-extinguishing grid assembly. The front end of the arc-extinguishing grid assembly and the two partitions form two first limiting grooves that are aligned with the opening direction of the arc-extinguishing chamber. The two isolation components have two first insertion parts that are inserted into the first limiting grooves. Two second limiting grooves are arranged opposite each other on both sides of the interphase channel. The two isolation components are correspondingly provided with two second insertion parts that are inserted into the second limiting grooves. The first limiting grooves and the first insertion parts are fitted together along the length direction of the interphase channel to form a first limiting fit. The second limiting grooves and the second insertion parts are fitted together along the width direction of the interphase channel to form a second limiting fit.

[0005] As a preferred embodiment, the two isolation kits include two isolation slots suitable for accommodating the front end of the arc-extinguishing grid assembly, and two gas-generating plates that separate the two isolation slots from the arc-running channel. The two gas-generating plates are disposed on the opposite side of the two isolation kits and form an arc-running channel in the shape of a trumpet, wherein the inner port diameter of the arc-running channel is larger than its outer port diameter.

[0006] As a preferred embodiment, the two first insertion parts are respectively insertion plates formed on the other side of the two isolation kits. The insertion plates are arranged parallel to and opposite to the gas generating plate on both sides of the isolation groove. The insertion plates are inserted into the first limiting groove and are attached to the partition on one side of the arc extinguishing chamber.

[0007] As a preferred embodiment, the two second plug-in portions are respectively protrusions formed on the outer sides of the two plug-in plates, and the protrusions are arranged to intersect the plug-in plates perpendicularly to each other.

[0008] As a preferred embodiment, the interphase channel includes a recessed area for accommodating the arc-extinguishing chamber and the isolation gas-generating hood. The second limiting groove is disposed on the two side walls of the recessed area. The recessed area is provided with two limiting baffles that abut against one end of the two partitions. The other ends of the two partitions are respectively restricted to abut against two second insertion parts.

[0009] As a preferred embodiment, two limiting blocks are provided on the bottom sides of the two isolation kits. The limiting blocks are staggered vertically with the second insertion part and are located on the same side of the first insertion part. The bottom edge of the partition plate abuts against the limiting blocks.

[0010] As a preferred embodiment, the isolation kit has a front baffle connected between the plug plate and the gas-generating plate, and the front baffle, the plug plate and the gas-generating plate together form the isolation groove, the upper end of the isolation groove being an open insertion end and the lower end being a closed end.

[0011] As a preferred embodiment, the front baffle wall of the phase-to-phase channel facing the arc-extinguishing chamber opening is provided with a positioning groove, and the two isolation kits have positioning bosses that fit into the positioning grooves. The positioning bosses are integrally formed with the front baffle of the isolation kit.

[0012] As a preferred embodiment, the arc-running channel connects to the opening of the arc-extinguishing chamber, and a moving contact and a stationary contact are provided therein. A stationary arc-inducing component located at the bottom of the arc-extinguishing chamber body is installed in the phase-interval channel, and the stationary arc-inducing component is located close to the stationary contact. A moving arc-inducing component is provided at the top of the arc-extinguishing chamber body, located close to the moving contact.

[0013] As a preferred embodiment, a conductive plate extending to the circuit breaker terminal is installed in the interphase channel. The stationary contact is formed at one end of the conductive plate and located at the bottom of the arc-extinguishing chamber. The conductive plate has a slotted hole corresponding to the position of the stationary contact and the stationary arc-inducing element. The stationary arc-inducing element is installed in the interphase channel through a snap-fit ​​structure. When the conductive plate is fixed in the interphase channel, it presses the stationary arc-inducing element. The stationary arc-inducing element has an arc-inducing protrusion extending upward through the slot and positioned opposite to the stationary contact. The arc-inducing protrusion is used to guide the arc into the arc-extinguishing grid area of ​​the arc-extinguishing chamber.

[0014] Compared with the prior art, the technical solution of this utility model has the following advantages: 1. In the forced gas arc extinguishing device provided by this utility model, the two isolation components of the isolation gas generating hood are tightly connected to the arc extinguishing chamber body and the phase-to-phase channel through double insertion. Specifically, the first insertion part is inserted into the first limiting groove formed by the arc extinguishing grid assembly and the partition plate, directly connecting the isolation gas generating hood to the core component of the arc extinguishing chamber body; and the second insertion part is inserted into the second limiting grooves on both sides of the phase-to-phase channel, forming a rigid connection between the isolation gas generating hood and the circuit breaker body. This installation greatly enhances the structural stability and mechanical strength. The isolation of the gas generating hood using this technical solution is significantly improved. The gas generating hood forms a double-limiting and fixing structure through two sets of plug-in parts and two sets of plug-in connections, and builds a solid three-dimensional cross-fixing network. This design tightly limits the gas generating hood between the arc-extinguishing chamber and the phase-to-phase channel. Through bidirectional limiting and multi-part plug-in, the gas generating hood, the arc-extinguishing chamber, and the phase-to-phase channel form an integral rigid structure, which significantly improves the impact resistance and installation reliability. It can effectively buffer and disperse gas impact loads, avoid deformation and detachment caused by repeated impacts, ensure arc-extinguishing stability, and improve the service life and breaking capacity of the circuit breaker.

[0015] 2. In the powerful gas arc extinguishing device provided by this utility model, two isolation kits cover the front end of the arc extinguishing grid assembly on each side through isolation grooves, forming a reliable insulation barrier. The closed cooperation between the isolation groove and the front end of the grid reduces the leakage of high-temperature gas from the grid gap during the arc extinguishing process, making the gas pressure more concentrated inside the arc extinguishing chamber. The sidewall of the arc-running channel is formed by two oppositely arranged gas-generating plates. When the arc passes through the arc-running channel, it instantly stimulates the gas-generating plates to release a large amount of arc-extinguishing gas. According to the correspondence between the gas-generating plates and the arc-running channel, it ensures that the gas generation direction is highly matched with the arc path, avoids gas dispersion, maximizes the utilization rate of the gas-generating material, and enhances the arc-extinguishing force. In addition, the arc-running channel adopts a flared design with a wider inner and narrower outer opening, which is adapted to the arc motion characteristics and gas dynamics, guides the arc to enter the grid gap more smoothly, avoids arc stagnation or path deviation caused by sudden changes in channel size, improves the efficiency of the arc entering the grid, and accelerates the arc extinguishing.

[0016] 3. In the forced gas arc extinguishing device provided by this utility model, one end of the partition plate is directly abutted by the limiting baffle in the groove section, and the other end is pressed against the second insertion part of the isolation gas generating hood in the opposite direction. The two form a rigid clamp along the length of the interphase channel. This design can accurately lock the installation position of the arc extinguishing chamber and the isolation gas generating hood in the groove section, avoiding movement due to vibration, impact or assembly error, and ensuring that the arc extinguishing grid assembly is strictly aligned with the arc running channel. With this structural setting, since the two ends of the partition plate of the arc extinguishing chamber are abutted by the limiting baffle and the second insertion part in both directions, the force of the partition plate can be transferred to the limiting baffle and the second insertion part. The second insertion part is inserted into the second limiting groove of the interphase channel, and then the force of the arc extinguishing chamber is further transferred to the groove wall of the interphase channel. This multi-dimensional support relationship enables the arc extinguishing chamber and the isolation gas generating hood to form an integral rigid structure with the channel through mutual constraint, which greatly improves the deformation resistance, disperses the impact load, improves the fatigue resistance, and has good installation stability. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the installation of the forced gas arc extinguishing device provided by this utility model; Figure 2 A cross-sectional schematic diagram of the powerful gas arc extinguishing device provided by this utility model; Figure 3This is a three-dimensional structural diagram of the powerful gas arc extinguishing device of this utility model; Figure 4 This is a schematic diagram of the split structure of the powerful gas arc extinguishing device of this utility model; Figure 5 This is a schematic diagram of the installation structure of the gas-generating isolation hood of this utility model.

[0019] Explanation of reference numerals in the attached drawings: 1. Arc extinguishing chamber body; 11. Arc extinguishing grid assembly; 12. Partition plate; 2. Isolation gas generating hood; 20. Isolation kit; 21. First plug-in part; 22. Second plug-in part; 23. Isolation groove; 24. Gas generating plate; 25. Front baffle; 26. Positioning boss; 27. Limiting block; 28. Arc running channel; 3. Phase-to-phase channel; 31. Positioning groove; 32. Limiting baffle; 4. First limiting groove; 5. Second limiting groove; 6. Moving contact; 7. Stationary contact; 8. Moving arc ignition component; 9. Stationary arc ignition component; 10. Conductive plate. Detailed Implementation

[0020] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] In the description of this utility model, it should be noted that the terms "first", "second" and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0024] Example The following is a detailed description of this embodiment with reference to the accompanying drawings: This embodiment provides, as follows: Figures 1-5The diagram illustrates a forced-air arc extinguishing device installed in the phase-to-phase channel 3 of a circuit breaker. It includes an arc-extinguishing chamber 1 and an isolation gas-generating hood 2. The arc-extinguishing chamber 1 comprises an arc-extinguishing cavity formed by two opposing partitions 12 and arc-extinguishing grid plate assemblies 11 stacked within the arc-extinguishing cavity. The isolation gas-generating hood 2 is located on the opening side of the arc-extinguishing chamber 1 and includes two symmetrically arranged isolation components 20 forming an arc-running channel 28 between them. The two isolation components 20 respectively cooperate with the two partitions 12 to cover the front end of the arc-extinguishing grid plate assembly 11. The front end of the arc-extinguishing grid plate assembly 11 is flush with the two partitions 12. Two first limiting grooves 4 are formed between the two phases 2, which are aligned with the opening direction of the arc-extinguishing chamber 1. The two isolation kits 20 have two first insertion parts 21 that are inserted into the first limiting grooves 4. Two second limiting grooves 5 are arranged opposite each other on both sides of the phase channel 3. The two isolation kits 20 are respectively provided with two second insertion parts 22 that are inserted into the second limiting grooves 5. The first limiting grooves 4 and the first insertion parts 21 are fitted together along the length direction of the phase channel 3 to form a first limiting fit. The second limiting grooves 5 and the second insertion parts 22 are fitted together along the width direction of the phase channel 3 to form a second limiting fit.

[0025] In the above embodiment, the two isolation components 20 of the isolation gas generating hood 2 are tightly connected to the arc-extinguishing chamber 1 and the phase-to-phase channel 3 through double insertion. Specifically, the first insertion part 21 is inserted into the first limiting groove 4 formed by the arc-extinguishing grid assembly 11 and the partition 12, directly connecting the isolation gas generating hood 2 to the core component of the arc-extinguishing chamber 1. The second insertion part 22 is inserted into the second limiting grooves 5 on both sides of the phase-to-phase channel 3, forming a rigid connection between the isolation gas generating hood 2 and the circuit breaker body. This installation greatly enhances the structural stability and mechanical strength. The isolation of this technical solution... The gas generating hood 2 forms a double-limiting and fixing structure through the cooperation of two sets of plug-in parts and two sets of plug-in parts, and builds a solid three-dimensional cross-fixing network. This design tightly limits the installation of the gas generating hood 2 between the arc-extinguishing chamber body 1 and the phase-to-phase channel 3. Through bidirectional limiting and multi-part plug-in, the gas generating hood, the arc-extinguishing chamber body, and the phase-to-phase channel form an integral rigid structure, which significantly improves the impact resistance and installation reliability. It can effectively buffer and disperse gas impact loads, avoid deformation and detachment caused by repeated impacts, ensure arc-extinguishing stability, and improve the service life and breaking capacity of the circuit breaker.

[0026] The following is combined Figure 3-5 The specific setup of the isolation gas generation hood is explained in detail: The two isolation kits 20 include two isolation slots 23 suitable for accommodating the front end of the arc extinguishing grid assembly 11, and two gas generating plates 24 that separate the two isolation slots 23 from the arc running channel 28. The two gas generating plates 24 are arranged on the opposite side of the two isolation kits 20 and form an arc running channel 28 in the shape of a flared mouth. The inner port diameter of the arc running channel 28 is larger than its outer port diameter. In this structural configuration, two isolation kits 20 respectively cover the front end of the arc-extinguishing grid assembly 11 on one side through isolation grooves 23, forming a reliable insulation barrier. The closed cooperation between the isolation grooves 23 and the front end of the grid reduces the leakage of high-temperature gas from the grid gap during the arc extinguishing process, making the gas pressure more concentrated inside the arc extinguishing chamber. The sidewalls of the arc-running channel 28 are formed by two oppositely arranged gas-generating plates 24. When the arc passes through the arc-running channel 28, it instantly stimulates the gas-generating plates 24 to release a large amount of arc-extinguishing gas. According to the correspondence between the gas-generating plates 24 and the arc-running channel 28, it ensures that the gas generation direction is highly matched with the arc path, avoids gas dispersion, maximizes the utilization rate of the gas-generating material, and enhances the arc blowing force. In addition, the arc-running channel adopts a flared design with a wider inner and narrower outer opening, which is adapted to the arc motion characteristics and gas dynamics, guides the arc to enter the grid gap more smoothly, avoids arc stagnation or path deviation caused by abrupt changes in channel size, improves the efficiency of the arc entering the grid, and accelerates the arc extinguishing.

[0027] In a further preferred configuration, the two first insertion portions 21 are insertion plates formed on the other side of the two isolation components 20. The insertion plates are arranged parallel to and opposite to the gas generating plate 24 on both sides of the isolation groove 23. The insertion plates are inserted into the first limiting groove 4 and are attached to the partition plate 12 on one side of the arc extinguishing chamber 1. The two second insertion portions 22 are protrusions formed on the outer side of the two insertion plates. The protrusions are perpendicular to the insertion plates. Two limiting blocks 27 are provided at the bottom of the side of the two isolation components 20. The limiting blocks 27 and the second insertion portions 22 are staggered and placed on the same side of the first insertion portions 21. The bottom edge of the partition plate 12 abuts against the limiting blocks 27. The limiting blocks 27 provide support for the partition plates 12 on both sides of the arc extinguishing chamber 1. This structural design, with the plug-in plate and protruding plate respectively inserted into the first limiting groove 4 and the second limiting groove 5, forms an orthogonal limiting fit along the length-width of the interphase channel, locking the installation position of the isolation kit 20 from two vertical directions. This structural design, with the plug-in plate, protruding plate, and isolation kit 20 integrally formed without additional assembly gaps, gives the isolation kit 20 higher structural rigidity, enabling it to directly withstand greater impact loads. When the high-temperature, high-pressure gas in the arc-extinguishing chamber impacts the gas-generating plate, the impact force is transmitted through the plug-in plate to the partitions on both sides of the arc-extinguishing chamber for force dispersion, and simultaneously transmitted through the protruding plate to the interphase channel for force dispersion, preventing the impact force from concentrating at a single connection point and significantly improving the overall structure's impact resistance.

[0028] like Figure 1 and Figure 5 As shown, the interphase channel 3 includes a recessed area for installing and accommodating the arc-extinguishing chamber 1 and the isolation gas-generating hood 2. The second limiting groove is disposed on both sides of the recessed area. Two limiting baffles 32 are provided within the recessed area, engaging with one end of two partitions 12. The other ends of the two partitions 12 are respectively constrained and abutted against two second insertion parts 22. The advantage of this design is that one end of the partition 12 is directly abutted by the limiting baffles 32 within the recessed area, while the other end is counter-pressured by the second insertion parts 22 of the isolation gas-generating hood 2. The two form a rigid clamp along the length of the interphase channel 3. This design can precisely lock the installation position of the arc-extinguishing chamber 1 and the isolation gas-generating hood 2 within the recessed area, preventing them from shifting due to vibration, impact, or assembly errors. It ensures that the arc-extinguishing grid assembly 11 is strictly aligned with the arc-running channel 28. This structural arrangement, based on the partitions 1 of the arc-extinguishing chamber 1... Both ends of the arc-extinguishing chamber 1 are bidirectionally abutted by the limiting baffle 32 and the second insertion part 22, respectively. It can transfer its own force to the limiting baffle 32 and the second insertion part 22. The second insertion part 22 is inserted into the second limiting groove 5 of the phase channel 3, thereby further transferring the force of the arc-extinguishing chamber 1 to the channel wall of the phase channel 3. This multi-dimensional support relationship enables the arc-extinguishing chamber 1 and the isolation gas generation hood 2 to form an integral rigid structure with the channel through mutual constraint, which greatly improves the deformation resistance, disperses the impact load, improves the fatigue resistance, and has good installation stability.

[0029] In this embodiment, reference Figure 3-4 The isolation kit 20 has a front baffle 25 connected between the plug plate and the gas generating plate 24, and the isolation groove 23 is formed by the front baffle 25, the plug plate and the gas generating plate 24. The upper end of the isolation groove 23 is an open insertion end and the lower end is a closed end. The phase channel 3 is provided with a positioning groove 31 on the front baffle wall opposite to the arc extinguishing chamber opening. The two isolation kits 20 have positioning bosses 26 that are fitted into the positioning grooves 31. The positioning bosses 26 are integrally formed with the front baffle 25 of the isolation kit 20. In this structural configuration, the front baffle 25 of the isolation kit 20 is directly locked in its installation position in front of the arc-extinguishing chamber opening by embedding the positioning boss 26 into the positioning groove 31 of the front baffle wall. This allows the front baffle wall to directly resist the positive thrust of high-pressure gas through the fitting structure formed by the positioning groove 31 and the positioning boss 26, thereby strengthening the front end's impact resistance. Combined with the first limiting fit formed by the fitting of the first insertion part 21 and the first limiting groove 4, and the second limiting fit formed by the fitting of the second insertion part 22 and the second limiting groove 5, the structural stability of the isolation gas generating hood 2 under the direct impact of high-pressure gas is greatly improved.

[0030] In the powerful gas arc extinguishing device provided in this embodiment, such as Figure 2As shown, the arc-running channel 28 connects to the opening of the arc-extinguishing chamber, and a moving contact 6 and a stationary contact 7 are arranged inside it for contact. In order to attract the arc generated by the contact breaking to the arc-extinguishing chamber more quickly and effectively, a stationary arc-inducing component 9 located at the bottom of the arc-extinguishing chamber body 1 is installed in the phase-to-phase channel 3. The stationary arc-inducing component 9 is located close to the stationary contact 7. A moving arc-inducing component 8 is provided at the top of the arc-extinguishing chamber body 1, close to the moving contact 6. The moving arc-inducing component 8 is used to attract the arc on the side of the moving contact 6 into the arc-extinguishing chamber, and the stationary arc-inducing component 9 is used to attract the arc on the side of the stationary contact 7 into the arc-extinguishing chamber, thereby improving the arc-inducing efficiency and arc-extinguishing effect. As a specific structural arrangement, a conductive plate 10 extending to the circuit breaker terminal is installed in the phase-to-phase channel 3. The stationary contact 7 is formed at one end of the conductive plate 10 and located at the bottom of the arc-extinguishing chamber 1. The conductive plate 10 has slotted holes corresponding to the positions of the stationary contact 7 and the stationary arc-inducing element 9. The stationary arc-inducing element 9 is installed in the phase-to-phase channel 3 by a snap-fit ​​structure. The snap-fit ​​structure adopts an installation slot provided in the phase-to-phase channel 3. The lower end of the stationary arc-inducing element 9 is snapped into the installation slot. When the conductive plate 10 is fixed in the phase-to-phase channel 3, it presses the stationary arc-inducing element 9. The stationary arc-inducing element 9 has an arc-inducing protrusion extending upward through the slot and positioned opposite to the stationary contact 7. The arc-inducing protrusion is used to guide the arc. Entering the arc-extinguishing grid area of ​​the arc-extinguishing chamber 1, this structural configuration allows the stationary arc-initiating component 9 to be initially positioned by being inserted into the phase-to-phase slot 3 via an installation slot. Then, during installation with the terminal block, the arc-initiating component is pressed to form a secondary limiting position, thus constructing a dual fixing structure of slot positioning and surface contact pressing. This ensures the stability and reliability of the stationary arc-initiating component's installation connection. The design of the arc-initiating protrusion extending upwards through the slotted hole and approaching the stationary contact shortens the distance between the stationary contact and the stationary arc-initiating component, facilitating rapid arc ignition, reducing the arc's dwell time near the stationary contact, and minimizing erosion of the stationary contact. This allows for faster and more reliable introduction of the arc into the arc-extinguishing grid for segmentation, cooling, and extinguishing, improving the circuit breaker's breaking capacity and service life.

[0031] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A strong gas blast arc extinguishing device installed in the phase-to-phase channel (3) of a circuit breaker, characterized in that, include: The arc-extinguishing chamber (1) includes an arc-extinguishing cavity formed by two opposing partitions (12) and an arc-extinguishing grid assembly (11) stacked in the arc-extinguishing cavity; An isolation gas generation hood (2) is installed on one side of the opening of the arc-extinguishing chamber (1). It includes two isolation components (20) symmetrically arranged and forming an arc-running channel (28) between them. The two isolation components (20) cooperate with two partitions (12) to cover the front end of the arc-extinguishing grid assembly (11). The front end of the arc-extinguishing grid assembly (11) and the two partitions (12) form two first limiting grooves (4) consistent with the opening direction of the arc-extinguishing chamber (1). The two isolation components (20) have a first limiting groove (4) that can be inserted into the first limiting groove. 4) Two first plug-in portions (21); two second limiting grooves (5) are provided opposite to each other on both sides of the phase channel (3), and two isolation kits (20) are provided with two second plug-in portions (22) that are plugged into the second limiting grooves (5). The first limiting groove (4) and the first plug-in portion (21) are fitted together along the length direction of the phase channel (3) to form a first limiting fit, and the second limiting groove (5) and the second plug-in portion (22) are fitted together along the width direction of the phase channel (3) to form a second limiting fit.

2. The strong gas blast quenching device according to claim 1, characterized in that: The two isolation kits (20) include two isolation slots (23) suitable for accommodating the front end of the arc extinguishing grid assembly (11), and two gas generating plates (24) that separate the two isolation slots (23) from the arc running channel (28). The two gas generating plates (24) are arranged on the opposite side of the two isolation kits (20) and form an arc running channel (28) in the shape of a flared mouth. The inner port diameter of the arc running channel (28) is larger than its outer port diameter.

3. The forced gas arc extinguishing device according to claim 2, characterized in that: The two first plug-in parts (21) are plug-in plates formed on the other side of the two isolation kits (20). The plug-in plates are arranged parallel to the gas generating plate (24) on both sides of the isolation groove (23). The plug-in plates are inserted into the first limiting groove (4) and are attached to the partition plate (12) on one side of the arc extinguishing chamber body (1).

4. The forced gas arc extinguishing device according to claim 3, characterized in that: The two second plug-in portions (22) are respectively protrusions formed on the outer side of the two plug-in plates, and the protrusions are arranged to intersect the plug-in plates perpendicularly to each other.

5. The high gas blast arc extinguishing device of claim 4, wherein: Two limiting blocks (27) are provided on the bottom side of the two isolation kits (20). The limiting blocks (27) and the second plug-in part (22) are staggered and placed on the same side of the first plug-in part (21). The bottom edge of the partition (12) abuts against the limiting blocks (27).

6. The strong gas blast quenching device according to any one of claims 1-5, characterized in that: The interphase channel (3) includes a recessed area for installing and accommodating the arc-extinguishing chamber body (1) and the isolation gas generation hood (2). The second limiting groove is provided on both sides of the grooved area. The grooved area is provided with two limiting baffles (32) that abut against one end of the two partitions (12). The other ends of the two partitions (12) are respectively restricted to abut against the two second insertion parts (22).

7. The high gas blast arc quenching device of claim 6, wherein: The isolation kit (20) has a front baffle (25) connected between the plug plate and the gas generating plate (24), and the front baffle (25), the plug plate and the gas generating plate (24) form an isolation groove (23), the upper end of the isolation groove (23) is an open insertion end and the lower end is a closed end.

8. The high gas blast arc quenching device of claim 7, wherein: The phase channel (3) has a positioning groove (31) on the front baffle wall opposite the arc extinguishing chamber opening. The two isolation kits (20) have positioning bosses (26) that fit into the positioning grooves (31). The positioning bosses (26) are integrally formed with the front baffle (25) of the isolation kit (20).

9. The high gas blast arc quenching device of claim 1, wherein: The arc-running channel (28) is connected to the opening of the arc-extinguishing chamber, and a moving contact (6) and a stationary contact (7) are provided therein. A stationary arc-inducing component (9) located at the bottom of the arc-extinguishing chamber body (1) is installed in the interphase channel (3). The stationary arc-inducing component (9) is located close to the stationary contact (7). A moving arc-inducing component (8) is provided at the top of the arc-extinguishing chamber body (1) near the moving contact (6).

10. The high gas blast arc extinguishing device of claim 9, wherein: A conductive plate (10) extending to the circuit breaker terminal is installed in the interphase channel (3). The stationary contact (7) is formed on one end of the conductive plate (10) and located at the bottom of the arc-extinguishing chamber (1). The conductive plate (10) has slotted holes corresponding to the stationary contact (7) and the stationary arc-inducing member (9). The stationary arc-inducing member (9) is installed in the interphase channel (3) by a snap-fit ​​structure. When the conductive plate (10) is fixed in the interphase channel (3), it presses the stationary arc-inducing member (9). The stationary arc-inducing member (9) has an arc-inducing protrusion extending upward through the slot and arranged opposite to the stationary contact (7). The arc-inducing protrusion is used to guide the arc into the arc-extinguishing grid area of ​​the arc-extinguishing chamber (1).

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