Improved arc extinguishing assembly of low-voltage circuit breaker

Abstract

The utility model relates to the technical field of circuit breaker arc extinguishing, in particular to an improved arc extinguishing assembly of a low-voltage circuit breaker, which comprises a circuit breaker body, an arc extinguishing chamber, a guide assembly and an attraction assembly, and is characterized in that the arc extinguishing chamber is fixedly arranged inside the circuit breaker body; the guide structure is arranged in the arc extinguish chamber and is used for dynamically adjusting the opening and closing angle of the arc chute according to the arc intensity and actively lengthening the arc path to perform arc extinguish work; and the attraction structure is arranged in the arc extinguish chamber and is used for assisting the guide structure to adapt to the temperature when the arc is generated so as to carry out directional angle opening and closing assistance on the arc chute. Compared with the prior art, the arc extinguishing assembly solves the problems of uncontrollable arc path and low arc extinguishing efficiency caused by static design of a traditional arc extinguishing assembly.

Description

Technical Field

[0001] This utility model relates to the field of arc extinguishing technology for circuit breakers, and in particular to an improved arc extinguishing component for low-voltage circuit breakers. Background Technology

[0002] A circuit breaker is an automatic electrical switching device used to automatically interrupt current when a fault occurs in a circuit (such as overload, short circuit, or leakage) to protect the circuit and electrical equipment from damage. The improved arc-extinguishing assembly of a low-voltage circuit breaker is a key component designed to improve arc extinguishing efficiency, reduce arc erosion of contacts, and enhance the breaking capacity and lifespan of the circuit breaker. Traditional low-voltage circuit breaker arc-extinguishing assemblies mostly use fixed metal grids or static magnetic blowout structures, and their arc-extinguishing efficiency is limited by the randomness and energy fluctuations of the arc. In existing technologies, the grids are usually arranged at a fixed angle, which cannot be dynamically adjusted according to the arc intensity, resulting in insufficient arc extinguishing at low currents and easy arc retention at high currents.

[0003] In the prior art, Chinese patent document CN215869259U, concerning arc extinguishing components, arc extinguishing devices, and molded case circuit breakers, proposes an arc extinguishing component comprising a first grid group and a second grid group. The first grid group includes multiple arranged first grids, and the second grid group includes multiple arranged second grids, with the second grids sequentially spaced below the first grids. Along the arc-initiating direction of the first grids, the multiple first grids are projected within the rotation trajectory of the moving contact, while along the arc-initiating direction of the second grids, the multiple second grids are projected outside the rotation trajectory of the moving contact. The multiple second grids are arranged radially from the side closest to the moving contact to the side furthest from the moving contact, thereby improving the arc extinguishing effect. However, in practical applications, the arc extinguishing grids are fixed-angle, double-layered structures, and the arc extinguishing path is optimized only by their arrangement, lacking adaptive adjustment capability for arcs of different intensities. Utility Model Content

[0004] In view of this, the purpose of this utility model is to propose an improved arc extinguishing component for low-voltage circuit breakers to solve the problems of uncontrollable arc path and low arc extinguishing efficiency caused by the static design of traditional arc extinguishing components.

[0005] To achieve the above objectives, this utility model provides an improved arc-extinguishing assembly for a low-voltage circuit breaker, comprising a circuit breaker body, an arc-extinguishing chamber, a guide assembly, and an attraction assembly, wherein the arc-extinguishing chamber is fixedly disposed inside the circuit breaker body.

[0006] A guiding structure, located inside the arc-extinguishing chamber, is used to dynamically adjust the opening and closing angle of the arc-extinguishing grid according to the arc intensity, and actively lengthen the arc path to perform arc extinguishing work.

[0007] An attraction structure is located inside the arc-extinguishing chamber to assist the guide structure in adapting to the temperature during arc generation, thereby providing directional angle opening and closing assistance for the arc-extinguishing grid.

[0008] Preferably, the guiding structure includes multiple guide plates, which are fixedly installed on the inner wall of the arc-extinguishing chamber. Multiple grid plates are disposed inside the arc-extinguishing chamber below the guide plates. A connecting rod is installed through the middle of each grid plate, and the connecting rod is fixedly connected to the grid plate. The grid plate is in contact with the guide plate. Thermistor blocks are fixedly connected to both ends of the connecting rod. Thermistor blocks are disposed at slots in the inner wall of the arc-extinguishing chamber and fixedly connected to the inner wall of the arc-extinguishing chamber. Multiple notches are fixedly provided on the connecting rod.

[0009] Preferably, the attraction structure includes a permanent magnet, which is fixedly installed on the inner wall of the arc-extinguishing chamber. The permanent magnet is located at the lower center of the grid plate, and an isolation layer is fixedly connected above the permanent magnet.

[0010] Preferably, a moving contact is rotatably installed inside the circuit breaker body, and a stationary contact is fixedly installed inside the circuit breaker body. The moving contact is in close contact with the stationary contact, and the moving contact is located above the arc-extinguishing chamber.

[0011] Preferably, a plurality of power input interfaces are fixedly provided on the upper side of one side of the circuit breaker body, and a plurality of power output interfaces are fixedly provided on the lower side of the circuit breaker body below the power input interfaces. A switch valve is rotatably installed on one side of the circuit breaker body at the position between the power input interfaces and the power output interfaces.

[0012] Preferably, the guide plate is an arc-shaped plate-shaped part, with one side of the guide plate close to the contact position between the moving contact and the stationary contact, and the other side in contact with the grid plate.

[0013] Preferably, the connecting rod is an elastic element, and recessed positions are provided on both sides where the grid plate connects to the connecting rod.

[0014] Preferably, the isolation layer is a specific magnetic component that undergoes a magnetic phase transition at high temperatures, changing from ferromagnetic to paramagnetic, resulting in a sharp drop in magnetic field strength.

[0015] The beneficial effects of this utility model are:

[0016] 1. This improved arc-extinguishing assembly for low-voltage circuit breakers achieves dynamic adjustment of the grid opening angle through the dual effects of the elastic deformation of the connecting rod driven by the thermistor and the magnetic field assistance of the permanent magnet. The high temperature of the electric arc triggers the expansion of the thermistor, actively lengthening the arc path of the grid; simultaneously, the demagnetization of the isolation layer releases the magnetic field of the permanent magnet, further accelerating the grid deflection. This design significantly improves the arc-extinguishing response speed, increases the breaking capacity compared to traditional structures, and requires no external energy source, resulting in high reliability.

[0017] 2. This improved arc-extinguishing assembly for low-voltage circuit breakers features an arc-shaped guide plate and a notch design in the grid plate that synergistically optimize arc segmentation efficiency. The guide plate forces the arc into the arc-extinguishing grid area, the notch in the grid plate enhances segmented arc cooling, and the magnetic field drive ensures the arc penetrates deep into the arc-extinguishing chamber. This combined structure results in more uniform arc energy dissipation, reduced contact erosion, and extended lifespan, making it particularly suitable for industrial applications with frequent circuit breaking. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the appearance and structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the internal structure of the arc-extinguishing chamber of this utility model;

[0022] Figure 4 This is a schematic diagram of the internal structure of this utility model;

[0023] Figure 5 This is a schematic plan view of the internal structure of the arc-extinguishing chamber of this utility model;

[0024] Figure 6 This is a schematic diagram of the internal cross-section of the guide structure of this utility model.

[0025] The diagram is marked as follows:

[0026] 1. Circuit breaker body; 2. Switch valve; 3. Power inlet interface; 4. Power outlet interface; 5. Arc extinguishing chamber; 6. Grid plate; 7. Guide plate; 8. Isolation layer; 9. Permanent magnet; 10. Connecting rod; 11. Thermistor block; 12. Moving contact; 13. Stationary contact. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0028] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0029] like Figures 1 to 6 As shown, an improved arc-extinguishing assembly for a low-voltage circuit breaker includes a circuit breaker body 1, an arc-extinguishing chamber 5, a guide assembly, and an attraction assembly. The arc-extinguishing chamber 5 is fixedly located inside the circuit breaker body 1. A moving contact 12 is rotatably installed inside the circuit breaker body 1, and a stationary contact 13 is fixedly installed inside the circuit breaker body 1. The moving contact 12 and the stationary contact 13 are tightly fitted together. The moving contact 12 is located above the arc-extinguishing chamber 5. Multiple power inlet ports 3 are fixedly opened on the upper side of one side of the circuit breaker body 1, and multiple power outlet ports 4 are fixedly opened on the lower side of the circuit breaker body 1 below the side of the power inlet ports 3. A switching valve 2 is rotatably installed on one side of the circuit breaker body 1 between the power inlet ports 3 and the power outlet ports 4.

[0030] Furthermore, such as Figures 2 to 6As shown, a guide structure, located inside the arc-extinguishing chamber 5, is used to dynamically adjust the opening and closing angle of the arc-extinguishing grid according to the arc intensity, actively lengthening the arc path for arc extinguishing. It includes multiple guide plates 7, which are fixedly installed on the inner wall of the arc-extinguishing chamber 5. Inside the arc-extinguishing chamber 5, below the guide plates 7, multiple grid plates 6 are arranged. A connecting rod 10 is installed through the middle of each grid plate 6, and the connecting rod 10 is fixedly connected to the grid plate 6. The grid plate 6 contacts the guide plate 7. Thermal blocks 11 are fixedly connected to both ends of the connecting rod 10. The thermal blocks 11 are located at slots in the inner wall of the arc-extinguishing chamber 5 and are connected to the arc-extinguishing chamber 5. The inner wall is fixedly connected, and multiple notches are fixedly opened on the connecting rod 10. The guide plate 7 is an arc-shaped plate-shaped part. One side of the guide plate 7 is close to the contact position between the moving contact 12 and the stationary contact 13, and the other side is in contact with the grid plate 6. The connecting rod 10 is made of an elastic material. Recessed positions are opened on both sides where the grid plate 6 connects to the connecting rod 10. The guide plate 7 and the grid plate 6 cooperate to dynamically adjust the opening and closing angle according to the arc intensity, actively lengthen the arc path, and improve the arc extinguishing efficiency. The thermal block 11 expands under the high temperature of the arc, pushing the connecting rod 10 to bend, which drives the grid plate 6 to adjust the angle to achieve adaptive arc extinguishing. The connecting rod 10 is made of elastic material, which can ensure rapid response to changes in the electric arc and withstand repeated deformation, thus extending its service life. The guide plate 7 has an arc-shaped plate structure, which optimizes the arc guiding path, reduces arc stagnation, and improves the arc extinguishing speed. The grid plate 6 contacts the guide plate 7 to ensure that the electric arc is forcibly guided into the arc extinguishing grid area and prevents escape. It relies entirely on the heat energy of the electric arc to drive the thermal block 11, causing the connecting rod 10 to deform and drive the grid plate 6 to adjust its angle. No additional power supply or control circuit is required. When the component is working, in the initial state, that is, when the circuit breaker is closed, the moving contact 12 and the stationary contact 13 are tightly attached, the circuit is conducting, and the grid plate 6 is in the connecting rod Under the elastic action of 10, it maintains the initial angle and contacts the guide plate 7. When the circuit breaker breaks, an arc is generated, the moving contact 12 separates from the stationary contact 13, and a high-temperature arc is generated. The arc enters the arc-extinguishing chamber 5 and moves towards the grid plate 6 along the arc-shaped structure of the guide plate 7. The high temperature of the arc causes the thermistor 11 to expand, pushing the connecting rod 10 to bend and deform. The connecting rod 10 drives the grid plate 6 to adjust the opening and closing angle, actively lengthening the arc path. The arc is divided into multiple segments by the grid plate 6 and rapidly cooled in the arc-extinguishing chamber 5. When the current crosses zero, the arc is extinguished, the thermistor 11 cools and contracts, the connecting rod 10 resets, and the grid plate 6 returns to its initial state.

[0031] Furthermore, such as Figures 2 to 5As shown, an attraction structure, located inside the arc-extinguishing chamber 5, assists the guiding structure in adapting to the temperature during arc generation, thereby guiding the arc-extinguishing grid's directional opening and closing. This structure includes a permanent magnet 9, fixedly mounted on the inner wall of the arc-extinguishing chamber 5. The permanent magnet 9 is positioned at the lower center of the grid plate 6. An isolation layer 8 is fixedly connected above the permanent magnet 9. The isolation layer 8 is made of a specific magnetic material, such as a gadolinium-silicon-germanium alloy, which undergoes a magnetic phase transition at high temperatures, changing from ferromagnetic to paramagnetic, resulting in a sharp drop in magnetic field strength. Utilizing the magnetic field of the permanent magnet 9 and the thermally induced demagnetization effect of the isolation layer 8, the dynamic response capability of the grid plate 6 is enhanced, and arc path control is optimized. When the high temperature of the arc triggers the demagnetization of the isolation layer 8... The magnetic field of permanent magnet 9 is released instantaneously, and the auxiliary grid plate 6 adjusts its angle to improve the arc extinguishing efficiency. When the module is in use, in the initial state without an electric arc, the isolation layer 8 is ferromagnetic, which shields the magnetic field of permanent magnet 9, resulting in a weak magnetic field in the arc extinguishing chamber 5. When an electric arc is generated, it is triggered by high temperature. The high temperature of the electric arc (>280℃) causes the isolation layer 8 to demagnetize, resulting in the removal of the magnetic field shield. The strong magnetic field of permanent magnet 9 is released, and the magnetic field attracts the grid plate 6, causing it to deflect towards the permanent magnet 9, increasing the opening and closing angle (dynamically adjusted). The electric arc is forcibly elongated and divided by the deflected grid plate 6, and at the same time, it is driven by the magnetic field to accelerate into the depth of the arc extinguishing chamber 5. After the electric arc is extinguished, the temperature drops, the isolation layer 8 returns to ferromagnetism, and the magnetic field is shielded again. The grid plate 6 is reset.

[0032] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0033] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An improved arc-extinguishing assembly for a low-voltage circuit breaker, characterized in that, include: The circuit breaker body (1), the arc-extinguishing chamber (5), the guide assembly and the attraction assembly, wherein the arc-extinguishing chamber (5) is fixedly opened inside the circuit breaker body (1); The guide structure is set inside the arc extinguishing chamber (5) to dynamically adjust the opening and closing angle of the arc extinguishing grid according to the arc intensity and actively lengthen the arc path to perform arc extinguishing work. An attraction structure is provided inside the arc-extinguishing chamber (5) to assist the guide structure in adapting to the temperature during arc generation, thereby providing directional angle opening and closing assistance for the arc-extinguishing grid.

2. The improved arc-extinguishing assembly for a low-voltage circuit breaker according to claim 1, characterized in that, The guiding structure includes multiple guide plates (7), which are fixedly installed on the inner wall of the arc-extinguishing chamber (5). Multiple grid plates (6) are arranged inside the arc-extinguishing chamber (5) below the guide plates (7). A connecting rod (10) is installed through the middle of the multiple grid plates (6). The connecting rod (10) is fixedly connected to the grid plate (6). The grid plate (6) is in contact with the guide plate (7). The two ends of the connecting rod (10) are fixedly connected to thermal blocks (11). The thermal blocks (11) are arranged at the slots in the inner wall of the arc-extinguishing chamber (5) and fixedly connected to the inner wall of the arc-extinguishing chamber (5). Multiple notches are fixedly opened on the connecting rod (10).

3. An improved arc-extinguishing assembly for a low-voltage circuit breaker according to claim 2, characterized in that, The attraction structure includes a permanent magnet (9), which is fixedly installed on the inner wall of the arc-extinguishing chamber (5). The permanent magnet (9) is located at the lower center of the grid plate (6), and an isolation layer (8) is fixedly connected above the permanent magnet (9).

4. An improved arc-extinguishing assembly for a low-voltage circuit breaker according to claim 3, characterized in that, The circuit breaker body (1) has a rotatable moving contact (12) inside and a stationary contact (13) fixedly installed inside. The moving contact (12) is in close contact with the stationary contact (13), and the moving contact (12) is located above the arc-extinguishing chamber (5).

5. An improved arc-extinguishing assembly for a low-voltage circuit breaker according to claim 1, characterized in that, Multiple power inlet ports (3) are fixedly opened on the upper side of one side of the circuit breaker body (1), and multiple power outlet ports (4) are fixedly opened on the lower side of the circuit breaker body (1) below the power inlet ports (3). A switch valve (2) is rotatably installed on one side of the circuit breaker body (1) between the power inlet ports (3) and the power outlet ports (4).

6. An improved arc-extinguishing assembly for a low-voltage circuit breaker according to claim 4, characterized in that, The guide plate (7) is an arc-shaped plate-shaped part. One side of the guide plate (7) is close to the contact position between the moving contact (12) and the stationary contact (13), and the other side is in contact with the grid plate (6).

7. An improved arc-extinguishing assembly for a low-voltage circuit breaker according to claim 2, characterized in that, The connecting rod (10) is an elastic element, and recessed positions are provided on both sides where the grid plate (6) connects to the connecting rod (10).

8. An improved arc-extinguishing assembly for a low-voltage circuit breaker according to claim 3, characterized in that, The isolation layer (8) is a specific magnetic component that undergoes a magnetic phase transition at high temperatures, changing from ferromagnetism to paramagnetism, resulting in a sharp drop in magnetic field strength.

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