A circuit breaker effective to prevent arc chamber explosion

Abstract

The utility model discloses a kind of circuit breaker effectively preventing arc chamber explosion, including circuit breaker shell and internal arc chamber, arc chamber right side is equipped with the buffer chamber communicated with it, buffer chamber right side interval is provided at least two exits, exit side is equipped with several arc discharge channels communicated with exit, arc discharge channel is communicated to outside through circuit breaker shell arc discharge port, and arc discharge channel is located in the arc discharge port one end two sides side wall and is equipped with the arc consumption component of facing in. The circuit breaker contains expansion gas in arc chamber through buffer chamber, multiple exits and arc discharge channel form efficient exhaust path, reduce arc chamber pressure;Arc consumption component accelerates arc consumption when gas and arc are discharged, reduce arc damage, can effectively prevent arc chamber explosion, improve the security and reliability of circuit breaker operation.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, specifically to a circuit breaker that effectively prevents arc chamber explosions. Background Technology

[0002] In modern power systems, circuit breakers, as critical control and protection devices, bear the important functions of connecting, carrying, and disconnecting current under normal circuit conditions, as well as connecting, carrying, and disconnecting current under abnormal circuit conditions within a specified time. Among them, the arc-extinguishing chamber, as the core component of the circuit breaker, directly determines the breaking capacity and reliability of the circuit breaker. When a circuit breaker's arc-extinguishing chamber interrupts a large current, a high-temperature electric arc is generated the instant the contacts separate. The accumulation of arc energy causes the gas inside the arc-extinguishing chamber to expand rapidly, creating a high-temperature, high-pressure environment. Currently, the arc-extinguishing chamber structure of traditional circuit breakers has significant defects in dealing with such situations. Due to the lack of efficient gas venting and arc dissipation mechanisms, the high-temperature, high-pressure gas inside the arc-extinguishing chamber cannot be discharged in time, causing the internal pressure to rise continuously. When the pressure exceeds the limit that the arc-extinguishing chamber can withstand, it can easily cause an explosion. This not only causes serious damage to the circuit breaker equipment and interrupts the power supply, but also poses a huge threat to the lives of people in the surrounding area, and can trigger a series of secondary disasters such as fires, causing serious losses to the safe and stable operation of the power system and the social economy. To address the aforementioned problems, those skilled in the art have conducted numerous studies and attempts. However, existing improvement schemes have failed to fundamentally achieve rapid emission of high-temperature, high-pressure gases within the arc-extinguishing chamber and effective consumption of the electric arc, thus failing to meet the ever-increasing demands for safe and stable operation of power systems. Therefore, there is an urgent need to design a novel circuit breaker structure to effectively prevent arc-extinguishing chamber explosions and ensure the safety of power equipment and personnel. Utility Model Content

[0003] To address the shortcomings of the prior art, this utility model provides a circuit breaker that effectively prevents arc chamber explosions.

[0004] The technical solution adopted by this utility model is: a circuit breaker that effectively prevents arc chamber explosion, including a circuit breaker housing, an arc extinguishing chamber is provided inside the circuit breaker housing, a buffer chamber communicating with the arc extinguishing chamber is provided on the right side of the arc extinguishing chamber, at least two outlets are provided at intervals from top to bottom on the right side of the buffer chamber, and a plurality of arc extinguishing channels are provided on one side of the outlets, the arc extinguishing channels correspond one-to-one with the outlets and are connected to the outlets, and the arc extinguishing channels are connected to the outside of the circuit breaker through the arc extinguishing port on the circuit breaker housing; The arc-extinguishing channel is provided with arc-consuming components on both sides of one end of the arc-extinguishing port. The arc-consuming components are arranged directly opposite each other on the two side walls of the arc-extinguishing channel.

[0005] Furthermore, the arc-extinguishing component includes a magnetic arc-quenching grid and a permanent magnet array; In the permanent magnet array, the magnets on both sides of the arc channel are arranged with alternating polarities and their positions correspond one-to-one, forming a magnetic field perpendicular to the axis of the arc channel. The magnetic arc-quenching grid covers the surface of the permanent magnet array.

[0006] Furthermore, the spacing between the permanent magnets on the two side walls is 0.4-0.7 times the height of the arc-arc channel, which is measured at the center of the arc-arc channel.

[0007] Furthermore, the magnetic induction intensity of the permanent magnet array is 0.5-1.2T.

[0008] Furthermore, the aperture of the magnetic arc-quenching grid is smaller than the diameter of the electric arc.

[0009] Furthermore, the arc-dissipating channel has I-shaped grooves on both sides of one end of the arc-dissipating port for embedding arc-consuming components.

[0010] Furthermore, the arc-shaped channel has an "L"-shaped structure with a rounded transition at the bend.

[0011] The beneficial effects of this utility model are: Firstly, by setting up a buffer chamber identical to the arc-extinguishing chamber on the right side, an additional space is provided for the rapidly expanding high-temperature and high-pressure gas inside the arc-extinguishing chamber. When the pressure inside the arc-extinguishing chamber rises, the gas can quickly enter the buffer chamber, effectively relieving the pressure inside the arc-extinguishing chamber and reducing the risk of the arc-extinguishing chamber exploding due to excessive pressure. At least two outlets are set at intervals on the right side of the buffer chamber, which, together with the arc-discharge channel connected to them, form multiple efficient gas discharge paths, ensuring that the high-temperature and high-pressure gas can be quickly discharged outside the circuit breaker, further ensuring that the internal pressure of the arc-extinguishing chamber is within a safe range. Secondly, the arc-dissipating components, located on the side walls of both ends of the arc-dissipating channel, can accelerate the dissipation of the electric arc as it enters the channel with the gas. Through special structural design or material properties, these components interact with the arc, accelerating its dissipation and reducing erosion of the arc on the arc-dissipating channel and surrounding components, thus extending the circuit breaker's service life. Simultaneously, they effectively reduce the energy of residual arc in the discharged gas, improving the circuit breaker's operational safety and preventing other safety hazards caused by residual arc. In addition to the objectives, features and advantages described above, this utility model has other objectives, features and advantages.

[0012] The present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0013] Figure 1This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 This is a partial top view of the present invention.

[0015] Figure 3 for Figure 2 Enlarged diagram at point A Figure 1-3 In the middle: 1. Circuit breaker housing; 2. Arc extinguishing chamber; 3. Buffer chamber; 4. Outlet; 5. Arc extinguishing channel; 6. Arc extinguishing port; 7. Arc dissipation component; 8. Magnetic arc extinguishing grid; 9. Permanent magnet array; 10. I-shaped slot; 11. Circular arc transition. Detailed Implementation

[0016] 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.

[0017] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0018] This invention provides a circuit breaker that effectively prevents arc chamber explosions.

[0019] In this embodiment, refer to Figure 1-3 The circuit breaker that effectively prevents arc chamber explosion includes a circuit breaker housing 1, an arc-extinguishing chamber 2 is provided inside the circuit breaker housing 1, a buffer chamber 3 communicating with the arc-extinguishing chamber 2 is provided on the right side of the arc-extinguishing chamber 2, at least two outlets 4 are provided at intervals from top to bottom on the right side of the buffer chamber 3, and a plurality of arc-extinguishing channels 5 are provided on one side of the outlets 4, the arc-extinguishing channels 5 correspond one-to-one with the outlets and are connected to the outlets, and the arc-extinguishing channels are connected to the outside of the circuit breaker through arc-extinguishing ports 6 on the circuit breaker housing; The arc-extinguishing channel is provided with arc-consuming components 7 on both sides of one end of the arc-extinguishing port. The arc-consuming components 7 are arranged directly opposite each other on the two sides of the arc-extinguishing channel.

[0020] In the above technical solution, the arc-extinguishing chamber interrupts a large current and generates a high-temperature electric arc, causing the internal gas to expand. By setting a buffer chamber identical to the arc-extinguishing chamber on the right side, the expanding gas can be contained, reducing the pressure in the arc-extinguishing chamber. Multiple outlets on the right side of the buffer chamber are connected to the arc-extinguishing channel, providing multiple paths for gas discharge, allowing the gas to be quickly discharged from the circuit breaker through the arc-extinguishing channel and arc-extinguishing port. The arc-consuming components located on both sides of one end of the arc-extinguishing channel can consume the electric arc when the gas and electric arc are discharged.

[0021] It effectively alleviates the pressure inside the arc-extinguishing chamber, preventing the chamber from exploding due to excessive pressure; multiple gas emission paths ensure the rapid discharge of high-temperature and high-pressure gases, maintaining stable internal pressure inside the arc-extinguishing chamber; the arc-consuming components accelerate arc consumption, reducing damage to surrounding components from the arc, and improving the operational safety and reliability of the circuit breaker.

[0022] Specifically, the arc-extinguishing component includes a magnetic arc-quenching grid 8 and a permanent magnet array 9; In the permanent magnet array, the magnets on both sides of the arc channel are arranged with alternating polarities and their positions correspond one-to-one, forming a magnetic field perpendicular to the axis of the arc channel. The magnetic arc-quenching grid covers the surface of the permanent magnet array.

[0023] In this embodiment, based on the principle of the effect of a magnetic field on an electric arc, the magnets on both sides of the arc-quenching channel in the permanent magnet array are arranged with alternating polarities to generate a magnetic field perpendicular to the axis of the arc-quenching channel. This magnetic field will generate a Lorentz force on the electric arc, causing the electric arc to move in the magnetic field, lengthen and spread the electric arc. A magnetic arc-quenching grid covers the surface of the permanent magnet array. Under the action of the magnetic field, the electric arc enters the magnetic arc-quenching grid and is divided into multiple short arcs. The principle of short arcs is used to accelerate the extinction of the electric arc, quickly extinguish the electric arc, reduce the electric arc energy, reduce the erosion of the arc-quenching channel and surrounding components by the electric arc, extend the service life of the circuit breaker, and at the same time improve the circuit breaker's ability and stability to interrupt large currents.

[0024] Specifically, the distance between the permanent magnets on the two side walls is 0.4-0.7 times the height of the arc-arc channel, which is measured at the center of the arc-arc channel.

[0025] In this embodiment, the spacing between the permanent magnets is set to 0.4-0.7 times the height of the arc-laying channel. This spacing range allows the magnetic field generated by the permanent magnets to form a relatively reasonable magnetic field intensity distribution and magnetic field gradient within the arc-laying channel. A suitable spacing ensures that the arc is subjected to sufficient Lorentz force in the magnetic field, allowing it to fully elongate and diffuse, while avoiding excessive magnetic field concentration due to too small a spacing between the permanent magnets, or uneven magnetic field distribution due to too large a spacing, which would affect the arc movement.

[0026] Specifically, the magnetic induction intensity of the permanent magnet array is 0.5-1.2T.

[0027] In this embodiment, the magnetic induction intensity of the permanent magnet array is set between 0.5 and 1.2 T. This intensity range provides a suitable Lorentz force for the electric arc. This ensures that the magnetic field has the best effect on the electric arc, accelerates arc consumption, improves the arc extinguishing performance of the circuit breaker when interrupting large currents, and enhances the reliability and safety of the circuit breaker.

[0028] Specifically, the aperture of the magnetic arc-quenching grid is smaller than the diameter of the electric arc.

[0029] In this embodiment, the aperture of the magnetic arc-extinguishing grid is smaller than the diameter of the electric arc. When the electric arc enters the magnetic arc-extinguishing grid under the action of the magnetic field, it will be forcibly divided into multiple shorter electric arcs. According to the short-arc extinguishing principle, the arc voltage drop of a short arc is larger. Under the same power supply voltage, multiple short arcs are easier to extinguish and can limit the spread of the arc, so that the arc energy is consumed more concentratedly.

[0030] Specifically, the arc-dissipating channel has I-shaped grooves 10 on the side walls of one end of the arc-dissipating port for embedding arc-consuming components.

[0031] In this embodiment, an "I"-shaped groove is provided on both side walls of one end of the arc-extinguishing channel located at the arc-extinguishing port for embedding the arc-extinguishing component. The structural design of the "I"-shaped groove 10 facilitates the installation and fixation of the arc-extinguishing component, ensures the accurate position of the arc-extinguishing component within the arc-extinguishing channel, enabling it to interact stably with the electric arc, and also facilitates disassembly and maintenance.

[0032] Specifically, the arc-shaped channel has an "L"-shaped structure, with an arc transition 11 at its bend.

[0033] In this embodiment, the arc-extinguishing channel adopts an "L"-shaped structure with a rounded transition at the bend. The "L"-shaped structure can extend the residence time of gas and electric arc in the arc-extinguishing channel, providing more time for the arc-consuming component to consume the electric arc. The rounded transition can reduce the flow resistance of gas and electric arc at the bend, making the flow of gas and electric arc smoother and avoiding airflow turbulence and electric arc energy concentration caused by right-angle bends.

[0034] Attention all technical personnel: Although this utility model has been described according to the specific embodiments above, the concept of this utility model is not limited to this utility model. Any modification that utilizes the concept of this utility model will be included within the scope of protection of this patent right.

Claims

1. A circuit breaker that effectively prevents arc chamber explosion, comprising a circuit breaker housing, wherein an arc-extinguishing chamber is disposed within the circuit breaker housing, characterized in that: A buffer chamber communicating with the arc-extinguishing chamber is provided on the right side of the arc-extinguishing chamber. At least two outlets are provided at intervals from top to bottom on the right side of the buffer chamber. Several arc-extinguishing channels are provided on one side of each outlet. Each arc-extinguishing channel corresponds to and is connected to the outlet. The arc-extinguishing channels are connected to the outside of the circuit breaker through the arc-extinguishing port on the circuit breaker housing. The arc-extinguishing channel is provided with arc-consuming components on both sides of one end of the arc-extinguishing port. The arc-consuming components are arranged directly opposite each other on the two sides of the arc-extinguishing channel.

2. The circuit breaker for effectively preventing arc chamber explosion according to claim 1, characterized in that: The arc-extinguishing component includes a magnetic arc-quenching grid and a permanent magnet array; In the permanent magnet array, the magnets on both sides of the arc channel are arranged with alternating polarities and their positions correspond one-to-one, forming a magnetic field perpendicular to the axis of the arc channel. The magnetic arc-quenching grid covers the surface of the permanent magnet array.

3. The circuit breaker for effectively preventing arc chamber explosion according to claim 2, characterized in that: The distance between the permanent magnets on the two side walls is 0.4-0.7 times the height of the arc-arranging channel, which is measured at the center of the arc-arranging channel.

4. The circuit breaker for effectively preventing arc chamber explosion according to claim 2, characterized in that: The magnetic induction intensity of the permanent magnet array is 0.5-1.2T.

5. The circuit breaker for effectively preventing arc chamber explosion according to claim 2, characterized in that: The aperture of the magnetic arc-quenching grid is smaller than the diameter of the electric arc.

6. The circuit breaker for effectively preventing arc chamber explosion according to claim 2, characterized in that: The arc-dissipating channel has I-shaped grooves on both sides of one end of the arc-dissipating port for embedding arc-consuming components.

7. The circuit breaker for effectively preventing arc chamber explosion according to claim 1, characterized in that: The arc-shaped channel has an "L" shape, with a rounded transition at the bend.

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