Arc extinguishing system of electrical device

Abstract

The utility model relates to an arc extinguishing system of an electrical device, comprising: an arc extinguishing chamber comprising a housing, arc extinguishing grid sheets and a gas generating sheet, the arc extinguishing grid sheets are arranged in the housing in a row, an opening at one side of the housing faces a contact system, an opening at the other opposite side is an exhaust port, and the gas generating sheet is arranged at the opening at one side of the housing facing the contact system; the flow guide part is arranged at the exhaust port of the arc extinguish chamber, at least one air outlet channel is arranged in the flow guide part, the outer side of the flow guide part is tightly attached to the inner wall of the electrical device, or the outer side of the flow guide part and the inner wall also form air outlet channels, and the total number of the air outlet channels is not less than two. Compared with the prior art, the plurality of air outlet channels are arranged at the air outlet of the arc extinguish chamber, so that the air outlet efficiency of each area of the arc extinguish chamber is optimized, unsmooth local air flow is avoided, and the utilization rate of the arc extinguish grid plates is improved; the gas in each gas outlet channel is insulated from each other, thereby preventing the arc from bypassing the arc extinguish chamber grid plate and causing the failure of the arc extinguish grid plate in a large area in the gas outlet channel.

Description

Technical Field

[0001] The utility model relates to the field of electrical switches, in particular to an arc extinguishing system for an electrical device. Background Art

[0002] In the current market for photovoltaic and energy storage systems, DC circuit breakers play a vital role, and their designs generally require a rated voltage of 1500 volts DC (DC1500V). During the disconnection process, due to the excessive voltage and current values, an arc is generated between the moving and static contacts. Generally, the deionization effect of the arc extinguishing grid is used to increase the dielectric recovery strength, extinguish the arc, and prevent the arc from reigniting. In the field of low-voltage electrical technology, in order to improve the arc extinguishing ability of the circuit breaker during the disconnection operation, a common technical strategy is to increase the number of arc extinguishing grids, thereby increasing the arc voltage. Traditionally, a single arc extinguishing chamber is equipped with only a limited number of grids, about a dozen or so. In order to meet the needs of higher voltage levels, a three-pole or four-pole series configuration is often required to increase the total capacity of the arc extinguishing chamber.

[0003] However, in traditional arc extinguishing chamber structures, due to the enormous pressure generated when the circuit breaker is tripped, the internal free gas has no smooth airflow path during the trip. As a result, the high-temperature gas and free metal particles inside the circuit breaker cannot be smoothly discharged, and the arc cannot be extinguished quickly, reducing the circuit breaker's breaking capacity. In addition, due to the high degree of gas ionization, the rear of the arc extinguishing grid is easily broken down when faced with a high-voltage arc under the influence of the high temperature and the electric field generated by the power supply voltage applied across the contacts. On the other hand, since the arc is discharged from the arc extinguishing chamber to the outside of the product, the pressure in the contact area is reduced. Under the influence of the external atmospheric pressure, the arc is easily returned to the contact area and reignited, affecting the product's arc extinguishing ability. Utility Model Content

[0004] The purpose of the present utility model is to provide an arc extinguishing system for an electrical device in order to overcome the defects of the above-mentioned prior art, optimize the gas outlet efficiency of each area of ​​the arc extinguishing chamber, avoid the problem of local gas flow obstruction, prevent the arc from breaking down on the rear side of the arc extinguishing grid, and prevent the arc from being discharged from the arc extinguishing chamber to the outside of the product.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] An arc extinguishing system for an electrical device, comprising:

[0007] The arc extinguishing chamber comprises a housing, arc extinguishing grids and gas generating plates, wherein the arc extinguishing grids are arranged in a row in the housing, one side of the housing is opened toward the contact system, and the other side of the housing is opened as an exhaust port, and the gas generating plates are arranged at the side of the housing opening toward the contact system;

[0008] The guide member is arranged at the exhaust port of the arc extinguishing chamber and is provided with at least one gas outlet channel. The outer side of the guide member is in close contact with the inner wall of the electrical device, or also forms a gas outlet channel with the inner wall. The total number of the gas outlet channels is not less than two.

[0009] Furthermore, the air outlet channel is divided into a plurality of sub-channels.

[0010] Furthermore, the sub-channels in the air outlet channel are arranged in multiple rows.

[0011] Furthermore, each of the air outlet channels is equipped with a free-flowing net.

[0012] Furthermore, the free-dissipating net is a metal mesh structure.

[0013] Furthermore, the arc extinguishing chamber is provided with an anti-breakdown component at the exhaust port, and the anti-breakdown component is located between the guide member and the arc extinguishing grid.

[0014] Furthermore, it also includes a moving contact air blocking accessory, which is arranged on the moving contact and always has an overlapping portion with the inner wall of the electrical device during the opening and closing process of the moving contact.

[0015] Furthermore, one side of the moving contact air blocking accessory is fixed to the moving contact in a covering manner, and the other side is an arc surface that matches the shape of the inner wall of the electrical device.

[0016] Furthermore, the housing includes two insulating plates arranged opposite to each other, the arc extinguishing grid is fixed between the two insulating plates, and the gas generating plates include two plates, which are respectively arranged on the two insulating plates and located on both sides of the moving contact.

[0017] Furthermore, the arc extinguishing chamber is provided with two arc striking plates, which are respectively arranged on both sides of the arrangement direction of the arc extinguishing grid plates and extend in the direction where the contact system is located.

[0018] Furthermore, an arc-extinguishing grid extending toward the moving contact is provided in the middle of a row of arc-extinguishing grids.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The utility model provides a flow guide at the arc extinguishing chamber outlet, and separates multiple air outlet channels by the flow guide and the inner wall of the electrical device casing, thereby optimizing the air outlet efficiency of each area of ​​the arc extinguishing chamber, avoiding local gas flow problems, and improving the utilization rate of the arc extinguishing grid; the gases in each air outlet channel are insulated from each other, preventing the arc from bypassing the arc extinguishing chamber grid and short-circuiting in the air outlet channel, causing arc extinguishing grid failure in a large area.

[0021] 2. By setting a metal ion elimination net in the air outlet channel, it can filter out metal particles and prevent the electrical device from being affected by arcing.

[0022] 3. Install anti-breakdown parts between the insulating plates behind the arc extinguishing grids to prevent the arc from breaking down on the rear side of the grids and limit the arc root to between the arc extinguishing grids.

[0023] 4. The moving contact gas blocking accessory structure cooperates with the electrical device cavity to prevent gas from entering the mechanism cavity when the moving contact is opened, thereby protecting the operating mechanism of the electrical device and improving the breaking performance.

[0024] 5. An arc extinguishing grid extending toward the moving contact is arranged in the middle of the arc extinguishing chamber to guide the arc to transfer to the arc extinguishing chamber in advance when the moving contact opens. By changing the position of the extended arc extinguishing grid in the arc extinguishing chamber, the gas outlet conditions of each gas channel can be coordinated. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the overall structure of the arc extinguishing system;

[0026] Figure 2 This is a structural explosion diagram of the arc extinguishing system;

[0027] Figure 3 It is a cross-sectional schematic diagram of the arc extinguishing system in the electrical device;

[0028] Figures 4 to 6 Schematic diagram of the guide structure from different perspectives;

[0029] Figure 7 is a side view of the guide member;

[0030] Figure 8 is a cross-sectional view of the guide member;

[0031] Figure 9 This is a schematic diagram of the installation of the guide piece and the insulation plate through the sliding groove tight fit method;

[0032] Figure 10 Schematic diagram of the installation of the guide piece and the insulation plate by snap-fitting;

[0033] Figure 11 Schematic diagram of the gas outlet channel division;

[0034] Figure 12 A schematic diagram of the division of the air outlet channel in another embodiment;

[0035] Figure 13 This is the three-view drawing of the moving contact air baffle accessory;

[0036] Figure 14 This is the three-view drawing of the moving contact air baffle accessory when it is installed on the moving contact;

[0037] Figure 15 This is a schematic diagram of the working principle of the moving contact air blocking accessory;

[0038] Figure 16 Schematic diagram of the arc and gas paths in the arc extinguishing system.

[0039] Reference numerals:

[0040] 1-arc extinguishing chamber; 2-arc extinguishing grid; 3-gas generating plate; 4-flow guide; 5-gas outlet channel; 6-sub-channel; 7-freezing net; 8-anti-breakdown part; 9-moving contact air baffle accessory; 10-moving contact; 11-insulating plate; 12-upper arc-starting plate; 13-lower arc-starting plate. DETAILED DESCRIPTION

[0041] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0042] like Figure 1 and Figure 2 As shown, this embodiment provides an arc extinguishing system for an electrical device, including an arc extinguishing chamber 1 and a flow guide 4. The arc extinguishing chamber 1 includes a housing, arc extinguishing grids 2, a breakdown prevention member 8, and gas generating plates 3. The arc extinguishing grids 2 are arranged in a row within the housing, with one side of the housing opening toward the contact system and the other side opening serving as an exhaust port. The gas generating plates 3 are positioned at the housing opening facing the contact system. By stacking arc extinguishing grids 2 within the arc extinguishing chamber 1, the arc is cut and divided into smaller segments with lower voltages. When the power supply voltage is less than the sum of the minimum arcing voltages between the grids, the arc is extinguished.

[0043] The flow guide 4 is disposed at the exhaust port of the arc extinguishing chamber 1 and is provided with at least one gas outlet channel 5. The outer side of the flow guide 4 is in close contact with the inner wall of the electrical device, or a certain gap is left between the ends of the flow guide 4 and the inner wall, which also forms a gas outlet channel 5, ensuring that the total number of gas outlet channels 5 is no less than two. In actual implementation, for example, when the outer side of the flow guide 4 is in close contact with the inner wall of the electrical device, at least two gas outlet channels 5 are provided in the flow guide 4. The provision of multiple gas outlet channels 5 can optimize the gas outlet efficiency of each area of ​​the arc extinguishing chamber, allowing the internal free gas to have a smooth airflow path during interruption, allowing the high-temperature gas and free metal particles inside the circuit breaker to be smoothly discharged, and avoiding local gas flow obstruction.

[0044] In this embodiment, two gas outlet channels 5 are provided in the flow guide 4, and a third gas outlet channel 5 is formed between the outer side of the flow guide 4 and the inner wall of the electrical device. The flow guide 4 and the outer shell of the electrical device divide the channel for gas discharge from the arc extinguishing chamber 1 into three independent small channels, such as Figure 3 and Figure 11 shown. Figure 3 In the diagram, the right side shows the contact system, while the left side shows the arc extinguishing system. The contact system consists of a moving contact 10, a stationary contact, and contact points. The gas generated in the arc extinguishing chamber 1 is discharged through a flow guide 4 and multiple gas outlet channels 5 separated from the electrical device housing. This prevents the arc from short-circuiting and catastrophic breakdown due to the hot air with high particle concentrations in the gas outlet channels 5.

[0045] In this embodiment, an arc-quenching grid 2 extending toward the moving contact 10 is positioned in the middle of a row of arc-quenching grids 2. This guides the arc to advance toward the arc-quenching chamber 1 as the moving contact 10 opens during contact opening. Changing the position of the extended arc-quenching grid 2 within the arc-quenching chamber 1 coordinates the gas flow from various gas channels. In actual implementation, the middle grids of a row of arc-quenching grids 2 can be extended a certain distance toward the contact system, and a longer arc-quenching grid 2 can be installed to enhance the arc guidance effect.

[0046] The arc-extinguishing chamber 1's housing comprises two opposing insulating plates 11, with the arc-extinguishing grid 2 secured between them. In this embodiment, the arc-extinguishing grid 2 has protrusions on either side, and the insulating plates 11 have slots that mate with the protrusions. The arc-extinguishing grid 2 is secured between the two insulating plates 11 via a snap-fit ​​mechanism. The gas-generating plates 3 comprise two plates, each secured to one of the insulating plates 11 and located on either side of the moving contact 10.

[0047] The arc-extinguishing chamber 1 is also equipped with two arc-strike plates: an upper arc-strike plate 12 and a lower arc-strike plate 13. These plates are located on either side of the arc-extinguishing grid 2 and extend toward the contact system. The upper arc-strike plate 12 is located on the side where the stationary contact is located. When the contacts open, the generated arc is guided into the arc-extinguishing chamber 1 by the two gas-generating plates 3 and the upper arc-strike plate 12.

[0048] like Figure 4-Figure 8 Figure 2 shows the structure of the flow guide 4. The outlet channel 5 can be further divided into multiple subchannels 6, which can further optimize the gas outlet efficiency of each area of ​​the arc extinguishing chamber 1 and provide a smooth airflow path. In this embodiment, the two outlet channels 5 within the flow guide 4 are each divided into two subchannels 6. The subchannels 6 are divided perpendicular to the arrangement direction of the outlet channels 5, that is, they are arranged in multiple rows; these can be two, three, or four rows to further improve exhaust efficiency.

[0049] The guide member 4 and the insulating plate 11 can be installed in a manner of tight fit through the sliding groove, such as Figure 9 The guide member 4 can also be fixed to the insulating plate 11 by snap-fitting, as shown in FIG. Figure 10 In actual implementation, other installation and fixing methods may also be used, such as gluing, integrated molding, etc.

[0050] The air outlet channel 5 can be equipped with a free-flowing net 7 for filtering metal particles to avoid arcing. The free-flowing net 7 can be made of a metal mesh or a metal wire mesh.

[0051] In other embodiments, Figure 12 As shown, an air outlet channel 5 is provided in the guide member 4 , and a second air outlet channel 5 is formed between the outer side of the guide member 4 and the inner wall of the electrical device, so there are two independent air outlet channels 5 in total.

[0052] The anti-breakdown member 8 is located at the exhaust port of the arc extinguishing chamber 1, between the flow guide 4 and the arc-quenching grid 2. In this embodiment, the anti-breakdown member 8 is installed between the insulating plates 11 behind the arc-quenching grid 2. The anti-breakdown member 8 is provided with two rows of staggered air outlets to prevent the arc from breaking down behind the arc-quenching grid 2 and improve the arc column distribution between the arc-quenching grids 2.

[0053] The arc extinguishing system also includes a moving contact air blocking accessory 9, which is arranged on the moving contact 10 and always has an overlapping portion with the inner wall of the electrical device during the opening and closing process of the moving contact 10. Figure 13 and Figure 14 As shown, in this embodiment, one side of the moving contact air blocking accessory 9 is fixed on the moving contact 10 in a covering manner, and the other side is an arc surface that matches the shape of the inner wall of the electrical device. Figure 15 As shown, when the moving contact 10 is closed, most of the arc surface of the moving contact air-blocking accessory 9 overlaps with the arc-shaped inner wall of the electrical device; when the moving contact 10 is opened, along the arc-shaped motion trajectory of the moving contact 10, the arc surface of the moving contact air-blocking accessory 9 passes over the arc-shaped inner wall of the electrical device; when the moving contact 10 is opened, the moving contact air-blocking accessory 9 still has an overlapping part with the inner wall of the electrical device, which can prevent high-temperature and high-pressure gas from entering the mechanism cavity, protect the circuit breaker operating mechanism, and improve the breaking performance.

[0054] When the contacts are disconnected, the arc and gas paths in the arc extinguishing chamber 1 are as follows: Figure 16 As shown in the figure, the dotted line is the arc path, and the hollow arrow is the gas discharge direction. The arc excites high-temperature and high-pressure gas in the arc extinguishing chamber 1, and the gas is discharged from the circuit breaker from each gas outlet channel 5. Each gas outlet channel 5 is related to the utilization rate of the arc cutting of the arc by the arc extinguishing grid 2 in the area of ​​the arc extinguishing chamber 1 corresponding to the right side. This arc extinguishing system optimizes the gas outlet efficiency of each area of ​​the arc extinguishing chamber 1 by dividing a plurality of gas outlet channels 5, avoids local gas flow problems, and improves the utilization rate of the grid. The gases in each gas outlet channel 5 are insulated from each other, avoiding the problem that the arc bypasses the arc extinguishing grid 2 and short-circuits in the gas outlet channel 5, causing the arc extinguishing grid 2 to fail in a large area. At the same time, the moving contact gas blocking accessory 9 prevents the gas from entering the mechanism cavity when the moving contact 10 is opened, thereby protecting the circuit breaker operating mechanism, improving the breaking performance, and further ensuring the arc extinguishing ability of the arc extinguishing system.

[0055] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0056] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0057] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0058] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0059] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0060] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art based on the concepts of the present invention through logical analysis, reasoning, or limited experimentation based on the existing technology should be within the scope of protection defined by the claims.

Claims

1. An arc extinguishing system for an electrical device, characterized in that: include: An arc extinguishing chamber (1) comprises a housing, arc extinguishing grids (2) and gas generating plates (3), wherein the arc extinguishing grids (2) are arranged in a row in the housing, one side of the housing is opened toward the contact system, and the other side of the housing is opened as an exhaust port, and the gas generating plates (3) are arranged at the side of the housing opening facing the contact system; A flow guide (4) is arranged at the exhaust port of the arc extinguishing chamber (1) and is provided with at least one gas outlet channel (5). The outer side of the flow guide (4) is in close contact with the inner wall of the electrical device, or forms a gas outlet channel (5) with the inner wall. The total number of the gas outlet channels (5) is not less than two.

2. The arc extinguishing system of an electrical device according to claim 1, characterized in that: The air outlet channel (5) is divided into a plurality of sub-channels (6).

3. The arc extinguishing system of an electrical device according to claim 2, characterized in that: The sub-channels (6) in the air outlet channel (5) are arranged in multiple rows.

4. The arc extinguishing system of an electrical device according to claim 1, characterized in that: Each of the air outlet channels (5) is equipped with a free-dissipating net (7).

5. The arc extinguishing system of an electrical device according to claim 4, characterized in that: The free-dissipating net (7) is a metal mesh structure.

6. The arc extinguishing system of an electrical device according to claim 1, characterized in that: The arc extinguishing chamber (1) is provided with an anti-breakdown component (8) at the exhaust port, and the anti-breakdown component (8) is located between the flow guide (4) and the arc extinguishing grid (2).

7. The arc extinguishing system of an electrical device according to claim 1, characterized in that: It also includes a moving contact air blocking accessory (9), which is arranged on the moving contact (10) and always has an overlapping portion with the inner wall of the electrical device during the opening and closing process of the moving contact (10).

8. The arc extinguishing system of an electrical device according to claim 7, characterized in that: One side of the moving contact air blocking accessory (9) is fixed on the moving contact (10) in a covering manner, and the other side is an arc surface that matches the shape of the inner wall of the electrical device.

9. The arc extinguishing system of an electrical device according to claim 1, characterized in that: The housing comprises two insulating plates (11) arranged opposite to each other, the arc extinguishing grid (2) is fixed between the two insulating plates (11), and the gas generating plate (3) comprises two plates, which are respectively arranged on the two insulating plates (11) and located on both sides of the moving contact (10).

10. The arc extinguishing system of an electrical device according to claim 1, characterized in that: The arc extinguishing chamber (1) is provided with two arc striking plates, which are respectively arranged on both sides of the arrangement direction of the arc extinguishing grid plates (2) and extend in the direction where the contact system is located.

11. The arc extinguishing system of an electrical device according to claim 1, characterized in that: An arc-extinguishing grid (2) extending in the direction of the moving contact (10) is provided in the middle of a row of arc-extinguishing grids (2).

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