An arc extinguishing chamber

Abstract

An arc-extinguishing chamber belongs to the technical field of low-voltage electrical apparatus. The arc-extinguishing chamber comprises a pair of side plates and a plurality of arc-extinguishing grid plates which are arranged at intervals between the pair of side plates and have a perforated plate on the air outlet side. The arc-extinguishing grid plates comprise first grid plates and second grid plates. In the array direction of the arc-extinguishing grid plates, the first grid plates are located at least on the two outer sides of the second grid plates. There is an air channel between the first grid plates and the perforated plate, while the second grid plates are in direct contact with or small-gap cooperation with the perforated plate to prevent the airflow on the two sides of the second grid plates from colliding with each other. The advantage is that the airflow collision is prevented by dividing the two sides of the second grid plates into two air channels, thereby ensuring the smoothness of the arc entering the arc-extinguishing grid plates.

Description

Technical Field

[0001] This utility model belongs to the field of low-voltage electrical technology, specifically relating to an arc-extinguishing chamber. Background Technology

[0002] Low-voltage switches are used to disconnect or connect circuits in power distribution lines. More specifically, they connect or disconnect lines by closing or opening the contact system of the switch, thereby protecting the load equipment.

[0003] The contact system includes moving and stationary contacts. When the moving and stationary contacts separate, an electric arc is generated. The arc moves upward and enters the arc-extinguishing chamber, where it is cut by the arc-extinguishing grid and eventually extinguished. However, the arc also generates a large amount of gas in the arc-extinguishing chamber. The flow of this gas is uncontrolled and may cause backflow of the arc, making it difficult for the arc to enter the arc-extinguishing grid smoothly. This ultimately leads to difficulty in extinguishing the arc, or even failure to extinguish the arc. Utility Model Content

[0004] The objective of this invention is to provide an arc-extinguishing chamber. By setting a first grid plate and a second grid plate, an air passage exists between the first grid plate and the orifice plate, and the second grid plate is in direct contact or has a small gap with the orifice plate, which helps to prevent the airflow on both sides of the second grid plate from impacting each other.

[0005] The present invention achieves its objective as follows: an arc-extinguishing chamber comprising a pair of side plates and arc-extinguishing grids, wherein multiple arc-extinguishing grids are spaced apart between the pair of side plates, and a perforated plate is provided on the air outlet side of each arc-extinguishing grid. Each arc-extinguishing grid includes a first grid and a second grid. In the array direction of the arc-extinguishing grids, the first grid is located at least on both outer sides of the second grid. An air passage exists between the first grid and the perforated plate, while the second grid is in direct contact or has a small gap with the perforated plate to prevent the airflow on both sides of the second grid from impacting each other.

[0006] In one specific embodiment of this utility model, the second grid plate is at least one piece and is located in the middle of the array of arc-extinguishing grid plates.

[0007] In another specific embodiment of this utility model, the second grid sheet consists of two or more adjacent and side by side.

[0008] In another specific embodiment of this utility model, there are at least two second grid plates arranged at intervals between each other, and in the array of arc-extinguishing grid plates, the first grid plate is located between the second grid plates and on both outer sides of the second grid plates.

[0009] In another specific embodiment of this utility model, it further includes a deionization component, which includes a support and a filter device located within the support, the support being used to accommodate the filter device.

[0010] In another specific embodiment of this utility model, the perforated plate is part of the filtration device and is located inside the support.

[0011] In a further specific embodiment of this utility model, the perforated plate is separately provided and located outside the bracket.

[0012] In a further specific embodiment of this utility model, an arc-extinguishing cover is also included, which is located on top of the arc-extinguishing chamber, and the arc-extinguishing cover is provided with air holes.

[0013] In yet another specific embodiment of this utility model, the deionization component is integrally embedded within the internal cavity of the arc-extinguishing cover.

[0014] In yet another specific embodiment of this utility model, the second grid plate can be embedded in the perforated plate.

[0015] The present invention has the following advantages due to the above-mentioned structure: by setting a first grid plate and a second grid plate, there is an air passage between the first grid plate and the perforated plate, and the second grid plate is in direct contact or in close contact with the perforated plate, so that the airflow on both sides of the second grid plate will not impact each other. That is, the airflow is divided into two air passages on both sides of the second grid plate, which prevents the airflow from impacting each other and ensures the smoothness of the arc entering the arc extinguishing grid plate. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the arc-extinguishing chamber described in this utility model; Figure 2 This is an explosion diagram of the arc-extinguishing chamber described in this utility model; Figure 3 This is a schematic diagram of the internal airflow of the arc-extinguishing chamber described in the first embodiment of this utility model; Figure 4 This is a schematic diagram illustrating the cooperation between the arc-extinguishing grid plate and the perforated plate in the second embodiment of this utility model; Figure 5 This is a schematic diagram of the internal airflow of the arc-extinguishing chamber described in the second embodiment of this utility model.

[0017] In the figure: 1. Side plate, 11. Fixing hole, 12. Mounting hole; 2. Arc extinguishing grid plate, 21. First grid plate, 22. Second grid plate; 3. Moving arc ignition plate; 4. Arc extinguishing cover; 5. Anti-free ionization component, 51. Bracket, 52. Filter device; 100. Orifice plate, 101. Vent hole. Detailed Implementation

[0018] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of this utility model should be considered within the protection scope of this utility model.

[0019] In the following description, all directional (or orientational) concepts involving up, down, left, right, front, and back refer to the position of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be construed as a special limitation on the technical solution provided by this utility model.

[0020] like Figure 1 This is a schematic diagram of an arc-extinguishing chamber. A switch typically includes an arc-extinguishing chamber and a contact system, both located inside the switch housing. Typically, an arc-extinguishing cavity is formed inside the housing, and both the arc-extinguishing chamber and the contact system are located within this cavity. The arc-extinguishing chamber is usually positioned in the opening direction of the contact system, i.e., above the contact system. When an electric arc is generated in the contact system, the arc enters the arc-extinguishing chamber and is extinguished within it, at which point the switch disconnects the current.

[0021] like Figure 1 , Figure 2 The arc-extinguishing chamber includes a pair of side plates 1, arc-extinguishing grid plates 2, a moving arc-inducing plate 3, an arc-extinguishing cover 4, and a deionization assembly 5. Multiple arc-extinguishing grid plates 2 are spaced apart between the pair of side plates 1. One end of the moving arc-inducing plate 3 is located at one end of the array of arc-extinguishing grid plates 2, while the other end extends into the interior of the arc-extinguishing chamber; and the moving arc-inducing plate 3 at one end of the arc-extinguishing grid plates 2 is also spaced apart from the arc-extinguishing grid plates 2.

[0022] The side plate 1 has a fixing hole 11 and a mounting hole 12. The fixing hole 11 is used for mounting the arc-extinguishing grid plate 2 and the moving arc-inducing plate 3. The mounting hole 12 is used for mounting with the anti-freezing component 5.

[0023] The movable arc-guiding piece 3 is typically made of metal sheet. It is formed through processes such as bending.

[0024] The arc-extinguishing cover 4 is located at the top of the arc-extinguishing chamber. The arc-extinguishing cover 4 has vent holes. Arc gas passes through the arc-extinguishing grid 2 and enters the deionization component 5, finally exiting from the vent holes on the arc-extinguishing cover 4 to the outside of the arc-extinguishing chamber.

[0025] Please see Figure 1 , Figure 2 and combined Figure 3The deionization component 5 is used to filter arc gas. In this embodiment, the deionization component 5 includes a bracket 51 and a filter device 52 located within the bracket 51. The bracket 51 is used to accommodate the filter device 52. In this embodiment, the filter device 52 includes a plurality of spaced-apart filter plates. The bracket 51 also cooperates with a pair of side plates 1. Specifically, the bracket 51 has protrusions, and the side plates 1 have mounting holes 12. The protrusions are embedded in the mounting holes 12 to achieve the mounting and cooperation relationship between the side plates 1 and the bracket 51. Preferably, the deionization component 5 is entirely embedded in the internal cavity of the arc-extinguishing cover 4 for easy installation.

[0026] In this embodiment, the arc-extinguishing grid plate 2 is also installed between a pair of side plates 1. Specifically, the two are fixedly installed by riveting the side plates 1 and the arc-extinguishing grid plate 2.

[0027] Continue reading Figure 3 The arc-extinguishing grid 2 includes a first grid 21 and a second grid 22. On the side of the arc-extinguishing grid 2 closest to the outlet of the arc-extinguishing chamber, the second grid 22 has a longer extension length than the first grid 21. That is, on the outlet side of the arc-extinguishing chamber, the second grid 22 is higher than the first grid 21. In the array direction of the arc-extinguishing grids 2, the first grid 21 is located on both sides of the second grid 22. In this embodiment, the first grid 21 is located on both sides of the second grid 22, and only one second grid 22 is shown in the figure. Preferably, the second grid 22 is located in the middle of the array of arc-extinguishing grids 2. The second grid 22 can be at least one, or it can be two or more adjacent to each other.

[0028] A perforated plate 100 is provided on the air outlet side of the arc-extinguishing grid 2, and the perforated plate 100 is directly adjacent to the arc-extinguishing grid 2. More specifically, the second grid 22 is in direct contact with the perforated plate 100, or the two are fitted with a small gap. The aforementioned small gap fit means that the height of the second grid 22 is sufficient to prevent the airflow on both sides of the second grid 22 from impacting each other. Usually, this gap refers to the assembly error that exists in the assembly of the arc-extinguishing chamber. Usually, this gap should be less than 2mm. More preferably, the second grid 22 can be embedded in the perforated plate 100 to achieve a better airflow isolation effect. An air passage exists between the first grid 21 and the perforated plate 100, allowing airflow to flow between the first grid 21 and the perforated plate 100.

[0029] Because of the presence of a second grid plate 22 that contacts or has a small gap with the orifice plate 100, the airflow on both sides of the second grid plate 22 will not impact each other. That is, the two sides of the second grid plate 22 are divided into two air channels, which prevents the airflow from impacting each other and avoids the difficulty of the electric arc entering the arc-extinguishing grid plate 2 on the impacted side due to the airflow impact. For example, the smoothness of the electric arc entering the arc-extinguishing grid plate 2.

[0030] like Figure 4 The perforated plate 100 has an array of vent holes 101. Gas enters upwards through these vent holes 101.

[0031] like Figure 4 , Figure 5 This is the second embodiment. The difference lies in that there are two second grid plates 22, spaced apart from each other. In the array of arc-extinguishing grid plates 2, the first grid plate 21 is also present between the two second grid plates 22. That is, in the array of arc-extinguishing grid plates 2, the first grid plate 21 is located between the second grid plates 22 and on both outer sides of the second grid plates 22. Of course, there can be more than two second grid plates 22; the principle is the same and will not be repeated here. That is, in this embodiment, there are at least two second grid plates 22.

[0032] In the two embodiments described above, the perforated plate 100 can be part of the filter device 52, that is, as the bottommost filter plate of the filter device 52. In this case, the perforated plate 100 is located inside the support 51. Alternatively, the perforated plate 100 can be provided separately, in which case the perforated plate is located outside the support 51. Defining the perforated plate 100 as a perforated plate is not limited to a plate shape; it can also be a support shape or other types.

Claims

1. An arc-extinguishing chamber, comprising a pair of side plates (1) and arc-extinguishing grids (2), wherein multiple arc-extinguishing grids (2) are spaced apart between the pair of side plates (1), and a perforated plate (100) is provided on the outlet side of the arc-extinguishing grids (2), characterized in that: The arc-extinguishing grid (2) includes a first grid (21) and a second grid (22). In the array direction of the arc-extinguishing grid (2), the first grid (21) is located at least on both outer sides of the second grid (22). There is an air passage between the first grid (21) and the orifice plate (100), while the second grid (22) is in direct contact or has a small gap with the orifice plate (100) to prevent the airflow on both sides of the second grid (22) from impacting each other.

2. The arc-extinguishing chamber according to claim 1, characterized in that: The second grid plate (22) is at least one and is located in the middle of the arc-extinguishing grid plate (2) of the array.

3. The arc-extinguishing chamber according to claim 2, characterized in that: The second grid plate (22) consists of two or more adjacent grid plates arranged side by side.

4. The arc-extinguishing chamber according to claim 1, characterized in that: The second grid plate (22) consists of at least two plates spaced apart from each other. In the array of the arc-extinguishing grid plates (2), the first grid plate (21) is located between the second grid plates (22) and on both sides of the second grid plates (22).

5. The arc-extinguishing chamber according to claim 1, characterized in that: It also includes a de-ionizing component (5), which includes a support (51) and a filter device (52) located within the support (51), the support (51) being used to accommodate the filter device (52).

6. An arc-extinguishing chamber according to claim 5, characterized in that: The perforated plate (100) is part of the filter device (52) and is located inside the support (51).

7. An arc-extinguishing chamber according to claim 5, characterized in that: The perforated plate (100) is separately provided and located outside the bracket (51).

8. An arc-extinguishing chamber according to claim 5, characterized in that: It also includes an arc-extinguishing cover (4), which is located on top of the arc-extinguishing chamber and has air holes.

9. An arc-extinguishing chamber according to claim 8, characterized in that: The de-ionizing component (5) is embedded entirely into the internal cavity of the arc-extinguishing cover (4).

10. An arc-extinguishing chamber according to claim 1, characterized in that: The second grid plate (22) can be embedded in the perforated plate (100).

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