A circuit breaker pressure relief structure

Abstract

This utility model discloses a pressure relief structure for a circuit breaker. Several pressure relief channels are spaced apart at the bottom of the arc-extinguishing chamber inside the circuit breaker casing. Each channel includes a first conical channel, a second conical channel, an annular anti-backflow protrusion, a honeycomb plate, and a pressure relief outlet. Multiple rows of annular anti-backflow protrusions are arranged in an arc shape, staggered between the two conical channels. The inner wall of the first conical channel is covered with an aluminum foil layer, and the inner wall of the second conical channel is coated with a PTFE coating. The honeycomb plate is connected to the pressure relief outlet. This structure reflects arc heat through the aluminum foil layer, reducing the temperature of the inner wall of the arc-extinguishing chamber and delaying material aging. The PTFE coating enhances arc cooling and improves arc extinguishing efficiency. Simultaneously, the multi-component coordinated pressure relief channels can quickly discharge high-temperature, high-pressure gas. The annular anti-backflow protrusions prevent gas backflow, and the honeycomb plate optimizes airflow dispersion, enhancing the corrosion resistance of the casing and the reliability of the circuit breaker, ensuring the safe and stable operation of the power system.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, specifically to a circuit breaker pressure relief structure. Background Technology

[0002] In modern power systems, circuit breakers, as critical protection and control devices, bear the important responsibility of rapidly interrupting current when faults such as overloads and short circuits occur, ensuring the safe and stable operation of the power system. The plastic casing of the circuit breaker not only provides physical protection for the internal components but also has a significant impact on its arc-extinguishing performance.

[0003] Currently, during the interruption of short-circuit current, the high-temperature heat generated by the electric arc in the arc-extinguishing chamber of a circuit breaker accumulates significantly on its inner wall. On the one hand, excessively high temperatures accelerate the aging and damage of the arc-extinguishing chamber and its outer casing materials, reducing the circuit breaker's service life. On the other hand, the heat is difficult to dissipate effectively, resulting in low arc cooling efficiency and prolonged arc extinguishing time, greatly affecting the circuit breaker's safety performance and breaking capacity. Existing arc-extinguishing chamber structures lack targeted heat management and arc cooling measures, failing to meet the high-efficiency operation requirements under complex conditions. Furthermore, problems such as low pressure relief efficiency and severe backflow during gas discharge further exacerbate the deterioration of the internal environment of the arc-extinguishing chamber. Therefore, it is urgent to design an optimized circuit breaker pressure relief structure to address multiple issues related to heat management, arc cooling, and pressure relief, thereby improving the arc extinguishing performance and safety of the circuit breaker. Utility Model Content

[0004] To address the shortcomings in the prior art, this utility model provides a circuit breaker pressure relief structure.

[0005] The technical solution adopted by this utility model is: a circuit breaker pressure relief structure, including a circuit breaker housing, an arc-extinguishing chamber is provided inside the circuit breaker housing, and a plurality of pressure relief channels are provided at intervals at the bottom of the arc-extinguishing chamber. The pressure relief channels include a first conical channel, a second conical channel, an annular anti-reverse flow protrusion, a honeycomb plate, and a pressure relief outlet.

[0006] The annular anti-reverse flow protrusion has an arc-shaped structure and is arranged in multiple rows between the first conical channel and the second conical channel, with the annular anti-reverse flow protrusions in the rows being staggered and spaced apart.

[0007] An aluminum foil layer is provided on the inner wall of the first conical channel;

[0008] A PTFE coating is provided on the inner wall of the second conical channel;

[0009] The pressure relief outlet is located on the bottom wall of the circuit breaker housing, and the honeycomb panel is connected to the bottom wall of the circuit breaker housing at the pressure relief outlet.

[0010] Furthermore, the angle α between the sidewall of the first conical channel and the vertical plane is 5-15 degrees, and the angle b between the sidewall of the second conical channel and the vertical plane is 10-20 degrees, with angle α being smaller than angle b.

[0011] Furthermore, the aluminum foil layer has a thickness of 50 μm, and the PTFE coating has a temperature resistance of >300℃.

[0012] Furthermore, the height of the annular anti-reverse flow protrusion is 1 / 2 to 2 / 3 of the height of the conical channel sidewall.

[0013] Furthermore, a connecting block is integrally formed on the bottom wall of the circuit breaker housing on both sides of the pressure relief outlet, and the connecting block is provided with a slot for inserting and connecting the honeycomb panel.

[0014] Furthermore, the honeycomb plate is provided with multiple rings of honeycomb holes, and the diameter of the honeycomb holes gradually increases from the center outwards.

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

[0016] First, the aluminum foil layer on the inner wall of the first conical channel, with its high reflectivity, reflects the large amount of heat generated by the electric arc back into the arc-extinguishing chamber space, effectively reducing heat absorption by the inner wall, lowering the temperature of the inner wall of the arc-extinguishing chamber, delaying material aging, and thus extending the overall service life of the circuit breaker. Second, the PTFE coating on the inner wall of the second conical channel has good thermal stability and low surface energy characteristics. It not only reduces the contact between the electric arc and the inner wall of the channel but also enhances the cooling effect on the arc, accelerates arc extinction, significantly improves the arc-extinguishing efficiency and breaking capacity of the circuit breaker, and ensures the safe and stable operation of the power system.

[0017] 2. Multiple pressure relief channels are spaced at intervals at the bottom of the arc-extinguishing chamber to quickly discharge high-temperature and high-pressure gas and reduce internal pressure. The annular anti-backflow protrusions are arranged in multiple staggered arcs to effectively prevent gas backflow and ensure stability during the pressure relief process. The honeycomb panel connected to the pressure relief outlet plays a role in uniformly dispersing the airflow, further optimizing the pressure relief effect and avoiding safety accidents such as shell rupture caused by excessive pressure.

[0018] 3. The aluminum foil layer and PTFE coating can also resist the corrosion of high temperature and high pressure gases. The former's good thermal conductivity can conduct heat to prevent damage to the inner wall, while the latter's excellent chemical stability and lubricity can resist gas corrosion and reduce gas flow resistance. The combination of the two significantly enhances the corrosion resistance of the inner wall of the pressure relief channel and improves the reliability and durability of the circuit breaker under complex working conditions.

[0019] In addition to the objectives, features and advantages described above, this utility model has other objectives, features and advantages.

[0020] The present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] Figure 2 for Figure 1 Enlarged diagram of point A in the middle.

[0023] Figure 3 This is a top view of the present invention.

[0024] Figure 1-3 In the middle: 1. Circuit breaker housing; 2. Arc extinguishing chamber; 3. First conical channel; 4. Second conical channel; 5. Annular anti-reverse flow boss; 6. Honeycomb panel; 7. Pressure relief outlet; 8. Aluminum foil layer; 9. PTFE coating; 10. Connecting block; 11. Slot; 12. Honeycomb hole. Detailed Implementation

[0025] 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.

[0026] 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.

[0027] This utility model provides a circuit breaker pressure relief structure.

[0028] In this embodiment, refer to Figure 1-3 The circuit breaker pressure relief structure includes a circuit breaker housing 1, an arc-extinguishing chamber 2 is provided inside the circuit breaker housing 1, and a plurality of pressure relief channels are provided at intervals at the bottom of the arc-extinguishing chamber 2. The pressure relief channels include a first conical channel 3, a second conical channel 4, an annular anti-reverse flow protrusion 5, a honeycomb plate 6, and a pressure relief outlet 7.

[0029] The annular anti-reverse flow protrusion has an arc-shaped structure and is arranged in multiple rows between the first conical channel and the second conical channel, with the annular anti-reverse flow protrusions in the rows being staggered and spaced apart.

[0030] An aluminum foil layer 8 is provided on the inner wall of the first conical channel;

[0031] A PTFE coating 9 is provided on the inner wall of the second conical channel;

[0032] The pressure relief outlet is located on the bottom wall of the circuit breaker housing, and the honeycomb panel is connected to the bottom wall of the circuit breaker housing at the pressure relief outlet.

[0033] In the above technical solution, a pressure relief channel containing multiple components is set at the bottom of the arc-extinguishing chamber as a gas discharge path, thereby improving the pressure relief efficiency and uniformity. The first and second conical channels use their conical structures to guide gas flow, while the multiple rows of interlaced arc-shaped anti-backflow protrusions change the gas flow direction and prevent backflow. The aluminum foil layer and PTFE coating manage the arc heat and gas based on their respective material properties. The honeycomb panel uses a porous structure at the pressure relief outlet to treat the discharged gas. All components work together to form a complete pressure relief and heat management system.

[0034] In summary, by adopting the above technical solutions, the high-temperature and high-pressure gas in the arc-extinguishing chamber can be discharged quickly and stably, effectively reducing the internal pressure; the aluminum foil layer reflects the arc heat and the PTFE coating enhances arc cooling, improving arc extinguishing efficiency; the overall structure enhances the corrosion resistance and service life of the circuit breaker casing, ensuring the safe and stable operation of the power system.

[0035] Specifically, the angle α between the sidewall of the first conical channel and the vertical plane is 5-15 degrees, and the angle b between the sidewall of the second conical channel and the vertical plane is 10-20 degrees, with angle α being smaller than angle b.

[0036] In this embodiment, the reasonable angle setting optimizes the flow characteristics of gas in the pressure relief channel, making the gas discharge smoother and more efficient, further improving the pressure relief efficiency of the arc-extinguishing chamber, reducing the risk of internal pressure accumulation, and enhancing the reliability of the circuit breaker in dealing with faults such as short circuits.

[0037] Specifically, the aluminum foil layer has a thickness of 50 μm, and the PTFE coating has a temperature resistance of >300℃.

[0038] In this embodiment, the aluminum foil layer is set to a thickness of 50μm, which ensures good flexibility and fit while having sufficient strength and reflective properties to effectively reflect the heat of the electric arc; the PTFE coating is required to have a temperature resistance of >300℃, and with its excellent high-temperature stability, it can continuously reduce the contact of the electric arc and enhance cooling in the high-temperature environment generated by the electric arc, and will not fail due to high temperature.

[0039] Specifically, the height of the annular anti-reverse flow protrusion is 1 / 2 to 2 / 3 of the height of the conical channel sidewall.

[0040] In this embodiment, the height of the annular anti-backflow boss is set to 1 / 2 to 2 / 3 of the height of the conical channel sidewall. This height range ensures that the boss provides sufficient obstruction and guidance for gas flow, changing the gas flow direction to prevent backflow, while also preventing excessive obstruction of normal gas discharge due to excessive height, thus ensuring the smoothness of the pressure relief channel.

[0041] Specifically, a connecting block 10 is integrally formed on the bottom wall of the circuit breaker housing on both sides of the pressure relief outlet, and the connecting block 10 is provided with a slot 11 for inserting and connecting the honeycomb panel.

[0042] In this embodiment, connecting blocks with slots are integrally formed on the bottom wall of the circuit breaker housing on both sides of the pressure relief outlet. Utilizing mechanical connection principles, this provides a stable and easy-to-install connection for the honeycomb panel. The cooperation between the slots and the honeycomb panel ensures that the honeycomb panel is tightly fixed at the pressure relief outlet, guaranteeing its stable function during gas discharge. Furthermore, the detachable design allows for individual replacement of the honeycomb panel if it is damaged.

[0043] Specifically, the honeycomb plate is provided with multiple rings of honeycomb holes 12, and the diameter of the honeycomb holes 12 gradually increases from the center to the outside.

[0044] In this embodiment, the diameter of the multiple rings of honeycomb holes 12 on the honeycomb plate gradually increases from the center to the outside. Based on the principle of fluid mechanics, when the gas flows from the center to the outside, the gas flow rate gradually decreases as the hole diameter increases, and the pressure distribution becomes more uniform. This can effectively reduce the impact force and turbulence when the gas is discharged, and at the same time, it is conducive to the full contact between the gas and the honeycomb plate, thus enhancing the gas treatment effect.

[0045] 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 pressure relief structure comprising a circuit breaker housing having an arc chute disposed therein, characterized by: The bottom of the arc-extinguishing chamber is provided with several pressure relief channels at intervals. The pressure relief channels include a first conical channel, a second conical channel, an annular anti-reverse flow protrusion, a honeycomb plate, and a pressure relief outlet. The annular anti-reverse flow protrusion has an arc-shaped structure and is arranged in multiple rows between the first conical channel and the second conical channel, with the annular anti-reverse flow protrusions in the rows being staggered and spaced apart. An aluminum foil layer is provided on the inner wall of the first conical channel; A PTFE coating is provided on the inner wall of the second conical channel; The pressure relief outlet is located on the bottom wall of the circuit breaker housing, and the honeycomb panel is connected to the bottom wall of the circuit breaker housing at the pressure relief outlet.

2. The circuit breaker pressure relief structure of claim 1, wherein: The angle α between the sidewall of the first conical channel and the vertical plane is 5-15 degrees, and the angle b between the sidewall of the second conical channel and the vertical plane is 10-20 degrees, with angle α being smaller than angle b.

3. The circuit breaker pressure relief structure of claim 1, wherein: The aluminum foil layer has a thickness of 50 μm, and the PTFE coating has a temperature resistance of >300℃.

4. The circuit breaker pressure relief structure of claim 1, wherein: The height of the annular anti-reverse flow protrusion is 1 / 2 to 2 / 3 of the height of the conical channel sidewall.

5. The circuit breaker pressure relief structure according to claim 1, characterized in that: Connecting blocks are integrally formed on the bottom wall of the circuit breaker housing on both sides of the pressure relief outlet, and slots for inserting and connecting the honeycomb panel are provided on the connecting blocks.

6. The circuit breaker pressure relief structure of claim 1 or 5, wherein: The honeycomb plate is provided with multiple rings of honeycomb holes, and the diameter of the honeycomb holes gradually increases from the center to the outside.

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