Gas production part, arc extinguishing device and switching electric appliance
By designing the optimized gas-producing structure, the gas ejection is accelerated by using arc-shaped raised edges and sheet-like structures, solving the problem of arc-not easy extinguishing, achieving faster arc extinguishing and temperature reduction, and improving arc extinguishing efficiency.
Patent Information
- Application Number
- CN202420907244.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-28
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-04-28
AI Technical Summary
When the circuit breaker is broken, the arc will not easily be extinguished, and the high-temperature arc will burn the equipment. The existing gas-producing parts have a simple structure, and the air blowing arc extinguishing effect is poor or there is a cyclone air flow, which affects the arc extinguishing effect.
An optimized gas-producing component structure is designed, including two rows of opposite toothed portions, the sheet unit is arranged at intervals in the thickness direction, the protruding portion has an arc-shaped edge, and the normal direction is directly opposite the outlet, for arc-fired During etching, accelerate gas is sprayed to the outlet, reduce the temperature of the arc extinguishing channel, and avoid cyclone air flow through the sheet-like structure and partition.
Effectively accelerate the extinguishing of the arc, reduce the temperature of the arc extinguishing channel, prevent the generation of short arcs in parallel, make the arc more concentrated, increase the arc voltage, accelerate the extinguishing speed, and increase the gas production, and improve the arc extinguishing efficiency.
Smart Images
Figure CN222233560U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of switch electrical appliance manufacturing, in particular to an improvement in an arc extinguishing device. Background Art
[0002] When the circuit breaker is disconnected, the initial distance between the moving contact and the static contact is small, while the electric field strength is high, and an arc will be generated between the moving and static contacts. If the arc is not extinguished, the circuit cannot be completely disconnected, and the arc temperature is very high. The high-temperature arc will burn the equipment and cause serious accidents. Therefore, one of the important functions of the circuit breaker is to quickly and effectively extinguish the arc generated when the circuit breaker is disconnected.
[0003] Adding gas-generating parts to arc extinguishing devices is a common measure to improve arc extinguishing effect. Gas-generating parts are generally made of insulating gas-generating materials such as nylon, melamine, POM, etc. When the arc burns the gas-generating parts, the gas-generating parts produce a large amount of gas, which promotes the auxiliary arc to quickly enter the arc extinguishing grid, achieving the effect of gas blowing arc extinguishing.
[0004] However, existing gas-generating components are generally simple in structure, some have insufficient gas blowing arc extinguishing effect, and some may produce swirling airflow during the gas generation process, which causes high-pressure gas to impact the gas-generating components and has an adverse effect on arc extinguishing. Utility Model Content
[0005] In view of the above problems, the utility model proposes a gas producing component structure with optimized structure, and based on the gas producing component structure, proposes an arc extinguishing device and a switch electrical appliance having the gas producing component.
[0006] The utility model is implemented by the following technical solutions:
[0007] The utility model proposes a gas producing part, which is used for being arranged in an arc extinguishing channel between an inlet and an outlet of an arc extinguishing device to realize gas blowing arc extinguishing, and comprises two rows of tooth-shaped portions facing each other, wherein the tooth-shaped portion comprises a sheet unit, wherein the sheet unit is a sheet structure with thickness, and a plurality of sheet units are sequentially arranged at intervals in the thickness direction thereof to form the tooth-shaped portion, and a gap between two adjacent sheet units is configured to allow a single arc extinguishing grid of the arc extinguishing device to be inserted, and the thickness of the sheet unit is configured to be suitable for being inserted between two adjacent arc extinguishing grids of the arc extinguishing device, and the sheet unit comprises a raised portion for compressing the arc extinguishing channel, wherein the raised portion comprises an arc-shaped raised edge, and at least a portion of the arc-shaped raised edge can be directly opposite to the outlet of the arc extinguishing device in its normal direction.
[0008] In one embodiment, preferably, the protrusions in the two rows of tooth-shaped portions are arranged opposite to each other in pairs, and the protrusions have a tendency to gradually approach the other protrusion opposite thereto and then gradually move away from the other protrusion opposite thereto.
[0009] In one embodiment, preferably, the raised edge includes a plurality of arc segments with different curvatures connected segment by segment.
[0010] In one embodiment, the preferred multiple arc segments include at least a first arc segment closest to another protrusion opposite thereto and a second arc segment arranged facing the outlet of the arc extinguishing device, and in the direction in which the two rows of tooth-shaped portions are arranged towards each other, the first arc segment is arranged steeper and the second arc segment is arranged flatter.
[0011] In one embodiment, preferably, it further includes a partition portion for separating the inlet of the arc extinguishing device.
[0012] In one embodiment, preferably, the gas producing component is composed of two gas producing component units that are mirror-imaged and butt-jointed.
[0013] Based on the above-mentioned gas-producing parts, the utility model also proposes an arc extinguishing device, including an inlet, an outlet and an arc extinguishing channel arranged between the inlet and the outlet, and also including an arc extinguishing grid and a gas-producing part. The gas-producing part is the gas-producing part as described above, and several of the arc extinguishing grids are arranged at intervals, and several sheet units of the gas-producing part and several arc extinguishing grids are interlaced.
[0014] In one embodiment, preferably, it also includes a bracket, the gas-generating part and the bracket are positioned and connected, the sheet unit includes an outer positioning surface facing the bracket, the outer end of the sheet unit away from the protrusion is bounded and closed by the outer positioning surface, and the outer positioning surface and the bracket are in contact.
[0015] In one embodiment, preferably, the gap between two arc-extinguishing grids and the sheet unit plugged therein are in a transition fit or interference fit relationship, and / or the gap between two sheet units and the arc-extinguishing grid plugged therein are in a transition fit or interference fit relationship.
[0016] Based on the above arc extinguishing device, the utility model further proposes a switch electrical appliance, comprising a contact system and an arc extinguishing device, wherein the arc extinguishing device is the above arc extinguishing device.
[0017] In one embodiment, preferably, the switching device is a circuit breaker.
[0018] The utility model has the following beneficial effects: In the utility model, the raised portion includes an arc-shaped raised edge, and at least part of the arc-shaped raised edge can be directly opposite to the outlet of the arc extinguishing device in the normal direction. Then, when the arc ablation section is directly opposite to the raised edge of the outlet in the normal direction, the normal component of the gas when diffusing outward can increase the speed of the gas ejecting to the outlet, prompting the hot gas in the arc extinguishing channel to be discharged to the outlet faster, reducing the heat accumulation in the insulating air in the arc extinguishing channel, reducing the gas temperature, eliminating the basic conditions for the occurrence of thermal breakdown of the insulating air, preventing the generation of parallel short arcs, making the arc more concentrated, and facilitating the rapid increase of the arc voltage and accelerating the speed of arc extinction. Moreover, the sheet unit in this embodiment is a sheet structure, with a larger gas production surface that can be used for arc ablation, and a larger gas production during the arc extinguishing process, which can achieve gas blowing arc extinguishing more quickly and quickly reduce the temperature in the arc extinguishing channel. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 is a full cross-sectional view of a circuit breaker in an embodiment;
[0020] Figure 2 is a structural exploded diagram of the arc extinguishing device in the embodiment;
[0021] Figure 3 is a side view of the arc extinguishing device in the embodiment
[0022] Figure 4 yes Figure 3 Sectional view at AA in the middle;
[0023] Figure 5 is a schematic diagram of a gas producing unit in an embodiment;
[0024] Figure 6 Schematic diagram of the gas generating member in the embodiment. DETAILED DESCRIPTION
[0025] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.
[0026] The utility model is now further described in conjunction with the accompanying drawings and specific implementation methods.
[0027] See also Figure 1As shown, as a preferred embodiment of the utility model, a switching device is provided. In this embodiment, the switching device is specifically a circuit breaker, including a contact system for realizing conduction or disconnection. The contact system further includes a static contact 100 and a moving contact 200, wherein the moving contact 200 has a motion stroke relative to the static contact 100. When the moving contact 200 moves and contacts the static contact 100, the contact system is turned on. When the moving contact 200 moves and separates from the static contact 100, the contact system is disconnected. An arc extinguishing device 10 is provided on one side of the contact system. More specifically, the arc extinguishing device 10 is provided on one side of the motion stroke trajectory of the moving contact 200. When the moving contact 200 and the static contact 100 are disconnected, the arc generated between the two is guided into the arc extinguishing device 10 through an arc striking component (e.g., an arc striking plate), and the arc is extinguished by the arc extinguishing device 10.
[0028] like Figure 2-4 The arc extinguishing device 10 includes a bracket 1, an arc extinguishing grid 2 and a gas producing part 3. The arc extinguishing device 10 is provided with an inlet 11 at one end close to the contact system, an outlet 12 at one end away from the contact system, and an arc extinguishing channel 13 between the inlet 11 and the outlet 12. The inlet 11 is configured to be open to the contact system so that the arc can enter the arc extinguishing channel 13 from the inlet 11. The outlet 12 leads to the outer space of the circuit breaker housing, and a flame extinguishing piece 14, a detaching net 15 and an arc extinguishing cover 16 are also fixedly provided at the position of the outlet 12. The bracket 1 is provided with two separate ones. The bracket 1 is a plate-like structure in this embodiment, which is made of insulating material to insulate and separate the arc extinguishing space inside the arc extinguishing device 10 from other components of the circuit breaker outside the arc extinguishing device 10. In this embodiment, the bracket 1 also serves as a supporting component. The arc extinguishing grid 2 and the gas producing component 3 are both positioned and connected to the bracket 1. The arc extinguishing grid 2 and the gas producing component 3 are in the arc extinguishing channel 13. The arc extinguishing grid 2 realizes arc extinguishing processing of the arc, and the gas producing component 3 realizes the gas blowing arc extinguishing function.
[0029] like Figure 4-6 In this embodiment, the gas-producing component 3 is composed of two gas-producing component units 300 that are mirror-imaged and butted together, and the gas-producing component 3 includes a mounting portion 31 for positioning and connecting the bracket 1. In this embodiment, the mounting portion 31 is fixedly mounted on the bracket 1, wherein a socket is provided on the bracket 1, and a plug is provided on the mounting portion 31, and the plug is plugged and fixed in the socket, or in other embodiments, the mounting portion 31 and the bracket 1 can also be fixedly connected together by screwing, riveting, bonding, etc. In other embodiments, the gas-producing component 3 can also be connected to other structures of the arc extinguishing device 10, but in this embodiment, the gas-producing component 3 and the bracket 1 are fixedly connected as a whole, and the gas-producing component 3 made of insulating material can also play a certain isolation role, insulating and separating the arc extinguishing space inside the arc extinguishing device 10 from other components of the circuit breaker outside the arc extinguishing device 10.
[0030] In other embodiments, according to the number of arc-extinguishing grids 2 and the specifications of the gas producing component 3 , a larger number of gas producing component units 300 may be provided, for example, two groups of four gas producing component units 300 may be provided.
[0031] The gas generating part 3 further includes two rows of tooth-shaped parts 32 facing each other, and the tooth-shaped parts 32 include sheet units 320, and the sheet units 320 are sheet structures with thickness, and several sheet units 320 are sequentially arranged in a thickness direction to form a row of tooth-shaped parts 32. There are several arc-extinguishing grids 2, and the several arc-extinguishing grids 2 are arranged at intervals, and the gap between two adjacent sheet units 320 is configured to allow a single arc-extinguishing grid 2 to be inserted, and the thickness of the sheet unit 320 is configured to be suitable for being inserted between two adjacent arc-extinguishing grids 2. In the entire arc extinguishing device 10, the several sheet units 320 of the gas generating part 3 and the several arc-extinguishing grids 2 are interlaced.
[0032] The sheet unit 320 includes a protrusion 321 for compressing the arc extinguishing channel 13. The arc extinguishing channel 13 is compressed by the protrusion 321, and high-pressure gas can be generated by utilizing the compressed gas channel when the gas producing part 3 is burned and gas is produced by the electric arc. In this embodiment, the protrusions 321 in the two rows of tooth-shaped portions 32 are arranged opposite to each other, and the protrusion trend of the protrusion 321 is to gradually approach the other protrusion 321 opposite to it and then gradually move away from the other protrusion 321 opposite to it, so that a Laval nozzle (such as the Laval nozzle) with a diameter that gradually shrinks and then gradually expands is formed between the two opposite protrusions 321. Figure 4 ), this structure can effectively speed up the gas eruption speed, thereby accelerating the gas blowing arc extinguishing process.
[0033] The raised portion 321 includes an arc-shaped raised edge 322, and at least a portion of the arc-shaped raised edge 322 can be directly opposite to the outlet 12 of the arc extinguishing device 10 in its normal direction. Figure 4 , an arrow is used to indicate the normal direction M of the raised edge 322 of one of the raised parts 321 at one of its positions. In other words, there is at least a section on the raised edge 322, and the normal direction of each point on this section just points to the outlet 12. Then, when the arc burns this section of the raised edge 322 that is directly opposite to the outlet 12 in the normal direction, the normal component of the gas when it diffuses outward can increase the speed of the gas ejecting toward the outlet 12, prompting the hot gas in the arc extinguishing channel to be discharged to the outlet 12 faster, reducing the heat accumulation in the insulating air in the arc extinguishing channel, lowering the gas temperature, eliminating the basic conditions for the occurrence of thermal breakdown of the insulating air, preventing the generation of parallel short arcs, making the arc more concentrated, which is conducive to the rapid increase of the arc voltage and accelerating the speed of arc extinction. Moreover, in this embodiment, the sheet unit 320 is a sheet structure, has a larger gas production surface that can be used for arc burning, has a larger gas production amount during the arc extinguishing process, can achieve gas blowing arc extinguishing more quickly, and quickly reduce the temperature in the arc extinguishing channel.
[0034] Among them, the raised edge 322 includes a plurality of arc segments with different curvatures connected in sections, wherein the plurality of arc segments include a first arc segment 3221 which is closest to another raised portion 321 opposite thereto, and in the direction in which the two rows of tooth-shaped portions 32 are arranged opposite to each other, the first arc segment 3221 is arranged to be steeper, so that the narrowest channel length of the Laval nozzle between the two opposite raised portions 321 is longer, thereby enhancing the compression and acceleration effect of the airflow, and the plurality of arc segments also include a second arc segment 3222 arranged facing the outlet 12 of the arc extinguishing device 10, and in the direction in which the two rows of tooth-shaped portions 32 are arranged opposite to each other, the second arc segment 3222 is arranged to be flatter, so that substantially the entire second arc segment 3222 is directly opposite to the outlet 12 of the arc extinguishing device 10 in its normal direction, thereby providing more gas normal components to promote the upward movement of the arc.
[0035] In this embodiment, the sheet units 320 and the arc-extinguishing grids 2 are interlaced, and the sheet units 320 of the sheet structure can play a good blocking effect in the gap between adjacent arc-extinguishing grids 2, preventing the arc from entering the gap between adjacent arc-extinguishing grids 2, thereby guiding the arc to move as much as possible along the channel between the two opposing protrusions 321. On this basis, it is more preferred that the gap between the two arc-extinguishing grids 2 and the sheet units 320 plugged therewith are in a transition fit or interference fit relationship, and / or the gap between the two sheet units 320 and the arc-extinguishing grids 2 plugged therewith are in a transition fit or interference fit relationship, and such a setting can further improve the blocking effect.
[0036] The sheet unit 320 includes an outer positioning surface 323 facing the bracket 1. The outer end of the sheet unit 320 away from the protrusion 321 is bounded and closed by the outer positioning surface 323, and the outer positioning surface 323 fits the bracket 1. The outer positioning surface 323 can effectively prevent the gas from forming a swirling airflow on both sides of the arc extinguishing grid 2.
[0037] like Figure 5 , 6 The gas producing part 3 also includes a partition 33, which is fixedly arranged at one end of the gas producing part 3 close to the inlet 11, and is used to be horizontally separated at the inlet 11 of the arc extinguishing device 10. In this embodiment, the partition 33 is a plate-shaped structure. The partitions 33 of the two gas producing part units 300 are butted against each other to form a horizontal partition structure whose span matches the inlet 11. The arrangement of the partition 33 can form a certain insulation isolation effect, and can protect the housing / base of the circuit breaker, reducing the ash generated by the ablation of the housing / base.
[0038] In addition to circuit breakers, the arc extinguishing device provided in this embodiment and the gas-generating parts and gas-generating part assemblies therein can also be applied to other switching electrical appliances, such as disconnectors and contactors.
[0039] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes made to the present invention in form and detail, without departing from the spirit and scope of the present invention as defined in the appended claims, shall fall within the scope of protection of the present invention.
Claims
1. A gas-generating part, which is arranged in the arc-extinguishing channel between the inlet and the outlet of the arc-extinguishing device to realize gas-blowing arc-extinguishing, and is characterized in that: The tooth-shaped portion comprises two rows of tooth-shaped portions facing each other, wherein the tooth-shaped portion comprises a sheet unit, and the sheet unit is a sheet structure having a thickness, and a plurality of sheet units are sequentially arranged at intervals in the thickness direction thereof to form the tooth-shaped portion. The gap between two adjacent sheet units is configured to allow a single arc-extinguishing grid of an arc-extinguishing device to be inserted, and the thickness of the sheet unit is configured to be suitable for being inserted between two adjacent arc-extinguishing grids of the arc-extinguishing device. The sheet unit comprises a protrusion for compressing the arc extinguishing channel, the protrusion comprises an arc-shaped protrusion edge, and at least a part of the arc-shaped protrusion edge can be directly opposite to the outlet of the arc extinguishing device in the normal direction thereof.
2. The gas generating component according to claim 1, characterized in that: The protrusions in the two rows of tooth-shaped portions are arranged opposite to each other in pairs, and the protrusion trend of the protrusion is to gradually approach the other protrusion opposite to it and then gradually move away from the other protrusion opposite to it.
3. The gas generating component according to claim 1, characterized in that: The raised edge includes a plurality of arc segments with different curvatures connected segment by segment.
4. The gas generating member according to claim 3, characterized in that: The multiple arc segments include at least a first arc segment closest to another protrusion opposite thereto and a second arc segment arranged facing the outlet of the arc extinguishing device. In the direction in which the two rows of tooth-shaped portions are arranged towards each other, the first arc segment is arranged steeper and the second arc segment is arranged flatter.
5. The gas generating member according to claim 1, characterized in that: It also includes a partition portion for separating the inlet of the arc extinguishing device.
6. The gas generating component according to any one of claims 1 to 5, characterized in that: The gas producing component is composed of two gas producing component units which are arranged in mirror images relative to each other and are butt-jointed and spliced.
7. An arc extinguishing device, comprising an inlet, an outlet and an arc extinguishing channel arranged between the inlet and the outlet, and also comprising an arc extinguishing grid and a gas generating member, characterized in that: The gas producing component is the gas producing component according to any one of claims 1 to 6, a plurality of the arc extinguishing grids are arranged at intervals, and a plurality of sheet units and a plurality of arc extinguishing grids of the gas producing component are interlaced.
8. The arc extinguishing device according to claim 7, characterized in that: It also includes a bracket, the gas generating part is positioned and connected to the bracket, the sheet unit includes an outer positioning surface facing the bracket, the outer end of the sheet unit away from the protrusion is bounded and closed by the outer positioning surface, and the outer positioning surface is in contact with the bracket.
9. A switchgear, comprising a contact system and an arc extinguishing device, characterized in that: The arc extinguishing device is the arc extinguishing device according to claim 7 or 8.
10. The switch device according to claim 9, characterized in that: The switching device is a circuit breaker.