Deionization structure of arc extinguish chamber

Abstract

The invention relates to a deionization structure of an arc extinguish chamber. A gas speed reduction channel is arranged at an exhaust port of the arc extinguish chamber. One side of the exhaust port of the arc extinguish chamber is provided with a gradually expanded hole plate for increasing the effective heat exchange area of the hot fluid and the silk screen; meanwhile, the partition plate and the silk screen are arranged in the protective cover, so that hot fluid flowing out of the arc extinguish chamber is shunted through the partition plate, the defects that the fluid only flows out of the top cover, the local flow speed is large, and the flashover distance is long are overcome, and the cooling effect is further improved.

Description

Technical Field

[0001] This invention belongs to the field of circuit breaker technology, specifically relating to an arc-extinguishing chamber deionization structure. Background Technology

[0002] In industrial low-voltage power systems, circuit breakers are an important component of the power distribution network. They are used to distribute electrical energy, connect and disconnect current in the power grid circuit, and protect lines and power equipment from faults such as overload, undervoltage, short circuit, and single-phase grounding. They are an essential part of the power supply system.

[0003] When a circuit fault occurs, the circuit breaker detects that the current value exceeds its preset protection current value and triggers the operating mechanism to quickly disconnect the moving and stationary contacts, thus breaking the circuit. However, during the disconnection process, due to excessive voltage and current, an electric arc is generated in the moving and stationary contacts. In addition, the excessively strong electric field causes the gas inside the circuit breaker to be highly ionized, producing a large number of free metal ions. If these free metal particles fly out of the circuit breaker, they may cause short circuits or burnouts in surrounding circuits, potentially leading to a disaster.

[0004] In existing technologies, the arc-extinguishing structure uses a combination of perforated plates and wire mesh, but this traditional structure has low heat exchange efficiency and severe arc flashover. The contact area between the high-speed hot fluid and the wire mesh after passing through the perforated plate is limited, reducing the effective heat exchange area and worsening the cooling effect. To ensure zero arc flashover, multiple layers of perforated plates and wire mesh are often arranged; however, too many perforated plates and wire mesh can lead to excessively high gas pressure in the arc-extinguishing chamber, affecting the breaking performance of the circuit breaker. Furthermore, the fluid in the protective cover cavity mainly flows out from both sides of the top cover, preventing sufficient cooling of the hot fluid and reducing the zero-arc flashover effect. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing arc-extinguishing chamber deionization structures by providing an arc-extinguishing chamber deionization structure. This structure features a gradually expanding perforated plate on one side of the arc-extinguishing chamber's exhaust port to increase the effective heat exchange area between the hot fluid and the wire mesh. Simultaneously, a partition plate and wire mesh are installed inside the protective cover, allowing the hot fluid flowing out of the arc-extinguishing chamber to be diverted through the partition plate. This avoids the problem of fluid flowing only from the top cover, resulting in high local flow velocities and long arcing distances, thus further improving the cooling effect.

[0006] Technical solution

[0007] To achieve the above technical objectives, the present invention provides an arc-extinguishing chamber deionization structure, characterized in that: a gas deceleration channel is provided at the exhaust port of the arc-extinguishing chamber;

[0008] The gas deceleration channel is at least one hole on at least one orifice plate, the at least one hole penetrates at least one orifice plate, the at least one orifice plate is stacked side by side on the outside of the arc-extinguishing chamber exhaust port, and the diameter of the at least one hole on the at least one orifice plate near the arc-extinguishing chamber exhaust port is smaller than the diameter of the hole away from the arc-extinguishing chamber exhaust port.

[0009] In one embodiment, a first heat exchange mesh is connected to the gas outlet of the gas deceleration channel, and a protective cover is installed on the outside of the first heat exchange mesh.

[0010] In one embodiment, the protective cover is provided with a partition plate that divides the inner cavity of the protective cover into at least two gas channels, so that the gas after heat exchange through the first heat exchange wire mesh can be discharged from the exhaust port of the protective cover.

[0011] In one embodiment, the at least one hole is a gradually expanding hole.

[0012] In one embodiment, the cross-section of the expanding hole is trapezoidal.

[0013] In one embodiment, at least one gas collecting hole is provided on the side of the orifice plate near the exhaust port, corresponding to the at least one hole.

[0014] In one embodiment, the at least one air collecting hole is a tapered hole.

[0015] In one embodiment, a second heat exchange mesh is provided at the exhaust port inside the protective cover to further cool the gas discharged from the protective cover.

[0016] In one embodiment, there are two partition plates that divide the inner cavity of the protective cover into vertical gas channels arranged in a horizontal direction in a zigzag pattern. The partition plates divide the protective cover into a middle gas channel from which gas is discharged from the top and / or rear end face, a left gas channel from which gas is discharged from the top and / or left side and / or rear end face, and a right gas channel from which gas is discharged from the top and / or right side and / or rear end face.

[0017] In one embodiment, there are two partition plates, which are arc-shaped and divide the protective cover into a middle gas channel through which gas is discharged from the top and / or rear end face, a left gas channel through which gas is discharged from the left and / or rear end face, and a right gas channel through which gas is discharged from the right and / or rear end face. The middle gas channel is wider at the top and narrower at the bottom.

[0018] Beneficial effects

[0019] This invention provides an arc-extinguishing chamber deionization structure, wherein a gas deceleration channel is provided at the exhaust port of the arc-extinguishing chamber. A gradually expanding perforated plate is provided on one side of the exhaust port of the arc-extinguishing chamber to increase the effective heat exchange area between the hot fluid and the wire mesh. Simultaneously, a partition plate and wire mesh are provided inside the protective cover, allowing the hot fluid flowing out of the arc-extinguishing chamber to be diverted by the partition plate, avoiding the defects of fluid flowing only from the top cover, resulting in high local flow velocity and long arcing distance, thus further improving the cooling effect. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Appendix Figure 1 This is a schematic diagram of the arc-extinguishing chamber deionization structure in the existing technology;

[0022] Appendix Figure 2 This is a schematic diagram of the arc-extinguishing chamber deionization structure in Embodiment 1 of the present invention. Figure 1 ;

[0023] Appendix Figure 3 This is a schematic diagram of the arc-extinguishing chamber deionization structure in Embodiment 1 of the present invention. Figure 2 ;

[0024] Appendix Figure 4 This is a schematic diagram of the arc-extinguishing chamber deionization structure in Embodiment 2 of the present invention. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0027] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0030] Example 1

[0031] As attached Figure 1 As shown, in existing technologies, the arc-extinguishing structure uses a combination of perforated plates and wire mesh, but this traditional structure has low heat exchange efficiency and severe arc flash. The contact area between the high-speed hot fluid and the wire mesh after passing through the perforated plate is limited, reducing the effective heat exchange area and worsening the cooling effect. To ensure zero arc flash, multiple layers of perforated plates and wire mesh are often arranged; however, too many perforated plates and wire meshes can lead to excessively high gas pressure in the arc-extinguishing chamber, affecting the breaking performance of the circuit breaker. Furthermore, the fluid in the protective cover cavity mainly flows out from both sides of the top cover, preventing sufficient cooling of the hot fluid and reducing the zero-arc flash effect.

[0032] To solve the above problems, see attached Figure 2 and 3As shown, this embodiment provides an arc-extinguishing chamber deionization structure. A gas deceleration channel is provided at the exhaust port 101 of the arc-extinguishing chamber 1. A first heat exchange mesh 2 is connected to the gas outlet of the gas deceleration channel, and a protective cover 3 is installed on the outside of the first heat exchange mesh 2. Specifically, the gas deceleration channel is at least one hole 501 on at least one perforated plate 5. The at least one hole 501 penetrates at least one perforated plate 5, and the at least one perforated plate 5 is stacked side-by-side on the outside of the exhaust port 101 of the arc-extinguishing chamber 1. The diameter of the at least one hole 501 on the at least one perforated plate 5 near the exhaust port 101 of the arc-extinguishing chamber 1 is smaller than the diameter on the side away from the exhaust port 101 of the arc-extinguishing chamber 1. The at least one hole 501 is a gradually expanding hole. In this embodiment, the at least one hole 501 is a gradually expanding hole on the perforated plate 5 that gradually expands from the exhaust port 101 side towards the first heat exchange mesh 2 side. The cross-section of the gradually expanding hole is trapezoidal.

[0033] The protective cover 3 is provided with a partition plate 4, which divides the inner cavity of the protective cover 3 into at least two gas channels, allowing the gas after heat exchange through the first heat exchange mesh 2 to be discharged from the exhaust port 101 of the protective cover 3. Generally, there are two partition plates 4, with both ends connected to the top and bottom surfaces of the protective cover 3, dividing the inner cavity of the protective cover 3 into vertical gas channels arranged in a zigzag shape along the horizontal direction. The partition plate 4 divides the protective cover 3 into a middle gas channel 3a from the top and / or rear end face, a left gas channel 3b from the top and / or left side and / or rear end face, and a right gas channel 3c from the top and / or right side and / or rear end face. More specifically, as shown in the attached... Figure 3 As shown, in this embodiment, there are two partition plates 4. One end of each partition plate 4 is connected to the bottom surface of the protective cover 3, and the other end is connected to the left and right sides of the protective cover 3 respectively. The partition plate 4 is arc-shaped, dividing the protective cover 3 into a middle gas channel 3a through which gas is discharged from the top and / or rear end, a left gas channel 3b through which gas is discharged from the left and / or rear end, and a right gas channel 3c through which gas is discharged from the right and / or rear end. The middle gas channel 3a is wider at the top and narrower at the bottom. A second heat exchange mesh 6 is also provided at the exhaust port inside the protective cover 3 to further cool the gas discharged from the protective cover 3. This protective cover can be applied to a switch where each individual pole includes an arc-extinguishing chamber, and a protective cover is arranged on the upper side of the arc-extinguishing chamber. It is also applicable to a switch where each individual pole includes at least two arc-extinguishing chambers arranged side by side, and a protective cover is arranged on the upper side of each arc-extinguishing chamber.

[0034] After the interrupted arc is extinguished by the arc-extinguishing grid 1a inside the arc-extinguishing chamber 1, it is discharged from the exhaust port 101 of the arc-extinguishing chamber 1. After passing through the deionization structure in this embodiment, zero arcing is achieved.

[0035] Example 2

[0036] As attached Figure 4 As shown, at least one gas collecting hole 502 is provided on the perforated plate 5 near the exhaust port 101, corresponding to at least one hole 501. The at least one gas collecting hole 502 is a tapered hole on the perforated plate 5 that gradually decreases in size from the exhaust port 101 side towards the first heat exchange wire mesh 2 side. In this embodiment, after the interrupted electric arc is extinguished by the arc-extinguishing grid 1a in the arc-extinguishing chamber 1, it is discharged from the exhaust port 101 of the arc-extinguishing chamber 1, collected by the gas collecting hole 502, decelerated by the tapered hole, and then heat-exchanged by the first heat exchange wire mesh 2 before entering the protective cover. In this embodiment, an exhaust channel 102 can also be provided between the tapered hole and the gas collecting hole 502 to further facilitate gas cooling. Other structures are the same as in Embodiment 1.

[0037] This embodiment provides an arc-extinguishing chamber deionization structure, wherein a gas deceleration channel is provided at the exhaust port 101 of the arc-extinguishing chamber 1. A gradually expanding perforated plate is provided on one side of the exhaust port of the arc-extinguishing chamber to increase the effective heat exchange area between the hot fluid and the wire mesh. At the same time, a partition plate and a wire mesh are provided inside the protective cover, so that the hot fluid flowing out of the arc-extinguishing chamber is diverted by the partition plate, avoiding the defects of fluid flowing out only from the top cover, resulting in a large local flow velocity and a long arcing distance, thereby further improving the cooling effect.

[0038] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0039] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A structure for eliminating free ionization in an arc-extinguishing chamber, characterized in that: A gas deceleration channel is provided at the exhaust port (101) of the arc-extinguishing chamber (1); The gas deceleration channel is at least one hole (501) on at least one orifice plate (5), the at least one hole (501) penetrates at least one orifice plate (5), the at least one orifice plate (5) is stacked side by side on the outside of the exhaust port (101) of the arc-extinguishing chamber (1), the diameter of the at least one hole (501) on the side of the at least one orifice plate (5) near the exhaust port (101) of the arc-extinguishing chamber (1) is smaller than the diameter of the side away from the exhaust port (101) of the arc-extinguishing chamber (1).

2. The arc-extinguishing chamber deionization structure as described in claim 1, characterized in that: The gas outlet of the gas deceleration channel is connected to a first heat exchange wire mesh (2), and a protective cover (3) is installed on the outside of the first heat exchange wire mesh (2).

3. The arc-extinguishing chamber deionization structure as described in claim 2, characterized in that: The protective cover (3) is provided with a partition plate (4), which divides the inner cavity of the protective cover (3) into no less than two gas channels, so that the gas after heat exchange through the first heat exchange wire mesh (2) can be discharged from the exhaust port of the protective cover (3).

4. The arc-extinguishing chamber deionization structure as described in claim 1, characterized in that: The at least one hole (501) is a gradually expanding hole.

5. The arc-extinguishing chamber deionization structure as described in claim 4, characterized in that: The cross-section of the gradually expanding hole is trapezoidal.

6. The arc-extinguishing chamber deionization structure as described in claim 1, characterized in that: At least one gas collecting hole (502) is provided on the side of the orifice plate (5) near the exhaust port (101) corresponding to the at least one hole (501).

7. The arc-extinguishing chamber deionization structure as described in claim 6, characterized in that: The at least one gas collecting hole (502) is a tapered hole.

8. The arc-extinguishing chamber deionization structure as described in claim 3, characterized in that: A second heat exchange mesh (6) is also provided at the exhaust port inside the protective cover (3) to further cool the gas discharged from the protective cover (3).

9. The arc-extinguishing chamber deionization structure as described in claim 3, characterized in that: There are two partition plates (4), which divide the inner cavity of the protective cover (3) into vertical gas channels arranged in a crisscross shape along the horizontal direction. The partition plates (4) divide the protective cover (3) into a middle gas channel (3a) from which gas is discharged from the top surface and / or the rear end surface, a left gas channel (3b) from which gas is discharged from the top surface and / or the left side and / or the rear end surface, and a right gas channel (3c) from which gas is discharged from the top surface and / or the right side and / or the rear end surface.

10. The arc-extinguishing chamber deionization structure as described in claim 3, characterized in that: There are two partition plates (4). The partition plates (4) are arc-shaped. The partition plates (4) divide the protective cover (3) into a middle gas channel (3a) from which gas is discharged from the top and / or rear end face, a left gas channel (3b) from which gas is discharged from the left side and / or rear end face, and a right gas channel (3c) from which gas is discharged from the right side and / or rear end face. The middle gas channel (1a) is wider at the top and narrower at the bottom.

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