Arc extinguish chamber assembly and switching device

Abstract

The utility model relates to an arc extinguish chamber assembly and a switching device, and the arc extinguish chamber assembly comprises a pedestal which is provided with a top opening and a bottom opening, the bottom opening is provided with a barrier strip unit which divides the bottom opening into at least two ventilation areas, and each ventilation area is internally provided with a guide unit to form an inclined air guide groove. The directions of the air guide grooves of the at least two ventilation areas are different; the arc extinguishing grid sheets are arranged in the base in a row shape; and the gas generating part is arranged at the top opening. Compared with the prior art, the barrier strip units are arranged at the opening at the bottom of the base to form different ventilation areas, so that high-temperature gas generated after the arc extinguishing grid sheets divide the arc is separated, and meanwhile, the gas guide grooves in different directions are arranged in the ventilation areas for guiding, so that a gas flow field is uniform and stable, and the arc extinguishing effect is improved. The breakdown of the arc extinguish chamber is effectively avoided, and the short-circuit breaking performance is improved.

Description

Technical Field

[0001] The utility model relates to the field of electrical switches, in particular to an arc extinguishing chamber component and a switch electrical appliance. Background Art

[0002] DC circuit breakers play a crucial role in the current photovoltaic and energy storage system market, with designs generally requiring a rated voltage of 1500 volts DC (DC1500V). Within the realm of low-voltage electrical technology, a common strategy for improving the circuit breaker's arc extinguishing capability during interruption is to increase the number of arc quenching grids, thereby raising the arc voltage. Traditionally, a single arc quenching chamber is equipped with only a limited number of grids, around a dozen or so. To meet higher voltage requirements, a three-pole or four-pole series configuration is often employed to increase the total capacity of the arc quenching chamber. Furthermore, new single-pole arc quenching chamber designs have emerged, significantly increasing the number of grids to 60 to 80, theoretically sufficient to meet the arc extinguishing requirements of DC1500V interruption. However, these products still face the following challenges: the conventional arc quenching chamber bottom structure is easily punctured by high-voltage arcs, resulting in a poor user experience; and the arc quenching chamber structure is complex. For example, the grids are typically secured by riveting, resulting in inefficient production and installation, and high costs. Utility Model Content

[0003] The purpose of the present invention is to provide an arc extinguishing chamber assembly and a switching device in order to overcome the defects of the above-mentioned prior art, improve the utilization rate of the arc extinguishing chamber, and avoid the problem of breakdown behind the arc extinguishing chamber; another purpose of the present invention is to simplify the installation structure of the arc extinguishing chamber and improve the stability and reliability of the structure.

[0004] The purpose of the utility model can be achieved through the following technical solutions:

[0005] An arc extinguishing chamber assembly, comprising:

[0006] The base comprises a top opening and a bottom opening, wherein the bottom opening is provided with a blocking unit to separate the bottom opening into at least two ventilation areas, each of the ventilation areas is provided with a guide unit to form an inclined air guide groove, and the air guide grooves of at least two ventilation areas have different directions;

[0007] Arc-extinguishing grids are arranged in rows in the base;

[0008] The gas generating component is arranged at the top opening.

[0009] Furthermore, air outlets are provided on both sides of the base, and the outlet of each air guide groove is biased towards the direction of the nearest air outlet.

[0010] Furthermore, the baffle unit includes a first baffle, which divides the bottom opening into a first ventilation area and a second ventilation area, and the air guide grooves in the first ventilation area and the air guide grooves in the second ventilation area are arranged in opposite directions.

[0011] Furthermore, the barrier bar unit further includes at least one second barrier bar perpendicular to the first barrier bar, the second barrier bar divides the first ventilation area into a plurality of first sub-areas, and the second barrier bar divides the second ventilation area into a plurality of second sub-areas.

[0012] Furthermore, the air guiding grooves in adjacent first sub-regions and the air guiding grooves in adjacent second sub-regions are arranged alternately.

[0013] Furthermore, the inclination angle of the air guide groove is 10 degrees to 80 degrees.

[0014] Furthermore, the bottom opening is an arc plane, and both sides of the arc plane are bent toward the top opening.

[0015] Furthermore, the base is composed of a first base shell and a second base shell combined along the arrangement direction of the arc-extinguishing grids.

[0016] Furthermore, the first seat shell is provided with raised ribs on both sides, and the second seat shell is provided with recessed grooves on both sides. When the first seat shell and the second seat shell are combined, the raised ribs are slidably engaged with the recessed grooves.

[0017] Or the first seat shell is provided with a first protrusion and a first concave block on both sides, and the second seat shell is provided with a second protrusion and a second concave block on both sides. When the first seat shell and the second seat shell are combined, the first protrusion slides and engages with the second concave block, and at the same time, the first concave block slides and engages with the second protrusion.

[0018] Furthermore, an embedded groove is provided on one side of the gas generating member for hanging on the edge of the top opening so that the gas generating member partially wraps the edge of the top opening.

[0019] Furthermore, a slot for installing the arc extinguishing grid is provided on the inner side of the base, and a fixing groove is provided on one side of the gas producing part having the embedded groove. After the gas producing part is installed on the top opening, the slot and the fixing groove are used together to fix the arc extinguishing grid.

[0020] A switching electrical appliance comprises a housing and an arc extinguishing chamber assembly as described above, wherein the arc extinguishing chamber assembly is installed in the housing and cooperates with the inner wall of the housing to expand the ventilation area to form multiple ventilation chambers.

[0021] Furthermore, the bottom opening is a first arc plane, both sides of which are bent toward the top opening, and the inner wall of the shell facing the bottom opening has a second arc plane with the same bending direction, and the curvature of the second arc plane is smaller than that of the first arc plane.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The utility model forms different ventilation areas by setting a baffle unit at the bottom opening of the base, thereby separating the high-temperature gas generated after the arc is divided by the arc extinguishing grid. At the same time, gas guide grooves in different directions are set in each ventilation area for guidance, so that the air flow field is uniform and stable, effectively avoiding the breakdown of the arc extinguishing chamber and improving the short-circuit breaking performance.

[0024] 2. Move the outlet of the air guide groove toward the air outlet of the base to optimize the air flow field and make it more uniform at the bottom.

[0025] 3. By setting the second baffle, the air flow field is divided, making the separation of the bottom high-temperature gas more uniform and refined.

[0026] 4. The base adopts a mutually interlocking seat shell structure, through which the raised ribs slide and fit into the recessed grooves, which is easy to install and has high production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the overall structure of the arc extinguishing chamber assembly.

[0028] Figure 2 This is a schematic diagram of the bottom perspective structure of the arc extinguishing chamber assembly.

[0029] Figure 3 A schematic diagram of the base structure.

[0030] Figure 4 Schematic diagram of the structure of the gas-generating parts.

[0031] Figure 5 This is a schematic structural diagram of the gas-generating component from another perspective.

[0032] Figure 6 This is a cross-sectional diagram of the installation of gas-generating components.

[0033] Figure 7 Schematic diagram of the working principle in the X-axis direction.

[0034] Figure 8 Schematic diagram of the working principle in the Y-axis direction.

[0035] Figures 9 to 11 Schematic diagrams of the bottom opening of the base in different embodiments.

[0036] Figure 12 Detailed diagram of the base shell.

[0037] Figure 13 The following is a schematic diagram of the base installation.

[0038] Figure 14 It is a partial cross-sectional diagram of a switching device.

[0039] Reference numerals:

[0040] 1 - base; 11 - top opening; 12 - bottom opening; 13 - air outlet; 14 - bar unit; 141 - first bar; 142 - second bar; 15 - first ventilation area; 151 - first sub-area; 16 - second ventilation area; 161 - second sub-area; 17 - air guide groove; 18 - slot;

[0041] 2-arc quenching grid;

[0042] 3-gas-generating part; 31-embedded groove; 32-fixing groove; 33-screw hole; 34-raised edge;

[0043] 4-first seat shell; 41-raised rib; 4a-second seat shell; 4a1-recessed groove;

[0044] 5-housing; 51-moving contact; 52-static contact; 53-arc striking piece;

[0045] 6- Ventilation chamber;

[0046] 7-first arc plane;

[0047] 8- Second arc plane. DETAILED DESCRIPTION

[0048] 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.

[0049] Example 1

[0050] like Figure 1 and Figure 2 As shown, this embodiment provides an arc extinguishing chamber assembly, comprising a base 1, arc extinguishing grids 2, and gas generating components 3. The base 1 has a top opening 11 and a bottom opening 12, with gas outlets 13 provided at its left and right ends. The gas generating components 3 are mounted on both sides of the top opening 11.

[0051] A barrier unit 14 is provided at the bottom opening 12 of the base 1, specifically a first barrier 141 and a second barrier 142 distributed in a cross shape. Figure 2It can be seen from the coordinate axis of the base 1 defined by the coordinates in that the first baffle 141 is arranged along the Y-axis direction of the arc extinguishing chamber base 1, separating the gas flow area behind the arc extinguishing chamber along the X-axis direction. The second baffle 142 is arranged left and right along the X-axis direction of the bottom of the arc extinguishing chamber base 1, separating the gas flow area behind the arc extinguishing chamber along the Y-axis direction. Thus, the first baffle 141 and the second baffle 142 jointly separate the bottom opening 12 of the base 1 into a field-shaped structure. The first baffle 141 divides the bottom opening 12 into the left and right first ventilation areas 15 and the second ventilation area 16. The second baffle 142 further divides the first ventilation area 15 into two upper and lower first sub-areas 151. At the same time, the second baffle 142 also divides the second ventilation area 16 into two upper and lower second sub-areas 161. A guide unit is provided in each ventilation area. The guide unit can be a simple horizontal bar or a pipe with a through hole. In this embodiment, a horizontal bar structure is adopted in order to form a gas guide groove 17 in the ventilation area. In this embodiment, the outlets of the air guide grooves 17 in the first ventilation area 15 and the second ventilation area 16 are respectively offset toward the adjacent air outlets 13 on either side, thereby separating and directing the airflow. The air guide grooves 17 in the two first sub-areas 151 have the same inclination angle, and the air guide grooves 17 in the two second sub-areas 161 have the same inclination angle. The air guide grooves 17 in the second sub-areas 161 can form a mirror image with the air guide grooves 17 in the first sub-area 151.

[0052] In another embodiment, the air guide grooves 17 in two adjacent first sub-regions 151 and the air guide grooves 17 in two adjacent second sub-regions 161 are staggered, that is, the air guide grooves 17 are staggered in the Y-axis direction, which can better disperse the airflow.

[0053] In another embodiment, the air guide grooves 17 of the two first sub-regions 151 have different inclination angles, and the air guide grooves 17 of the two second sub-regions 161 also have different inclination angles, so that the airflow can be more dispersed.

[0054] like Figure 3 As shown, the base 1 is manufactured using a one-piece injection molding process, resulting in a high overall structural strength. Slots 18 are provided on both sides of the inner wall of the base 1, oriented in the Z-axis direction. Arc-quenching grids 2 are inserted along these slots and arranged vertically within the base 1. When an arc enters the arc-quenching chamber through the top opening 11, the arc-quenching grids 2 divide the long arc, thereby rapidly extinguishing the arc.

[0055] like Figure 4 and Figure 5As shown, one side of the outer side of the gas producing part 3 is provided with an embedded groove 31 for hanging on the edge of the top opening 11. At the same time, a fixing groove 32 and a screw hole 33 are also provided on the side provided with the embedded groove 31. When fixing, first connect the embedded groove 31 of the gas producing part 3 to the protrusion of the top opening 11 of the base 1. At this time, the fixing groove 32 can fix the arc extinguishing grid 2 together with the slot 18, and the product part and the base 1 can also be fixed with screws. The function of the gas producing part 3 is: when an arc is generated in the arc extinguishing chamber, the arc burns the gas producing part 3, and the generated gas quickly increases the pressure of the arc extinguishing chamber, accelerating the arc to quickly enter the arc extinguishing chamber. At the same time, the generated gas can also cool the arc and accelerate the extinction of the arc. In another embodiment, raised edges 34 are provided on both sides of the gas producing part 3, and the raised edges 34 are used to be embedded in the housing 5 of the switch electrical system to form a sealed structure, such as Figure 6 As shown, the air tightness of the arc extinguishing chamber is improved, and the breaking performance and insulation performance are improved.

[0056] like Figure 7 and Figure 8 As shown, the working principle of this embodiment is as follows:

[0057] When the moving and static contacts 51, 52 of the electrical switch are opened to generate an arc, the arc gradually transfers from the contact position through the arc striking plate 53 to the top opening 11 of the arc extinguishing chamber. At this time, the arc heats the gas producing part 3 to generate gas that blows the arc further downward, contacts the arc extinguishing grid 2 and is divided, and finally discharged from the gas outlets 13 at both ends and the gas guide grooves 17 of the bottom opening 12. The inclination angle of the gas guide groove 17 is θ, which is generally 10°≤θ≤80°. The preferred angle in this embodiment is 30°≤θ≤60°. Figure 7 It can be seen that the first baffle 141 separates the left and right gas chambers, preventing interference between the left and right gases; at the same time, the gas guide groove 17 with a certain angle can more easily guide the gas out, reducing the high-temperature gas from passing through the back anti-breakdown component and hitting the base surface and directly reflecting back into the arc extinguishing chamber, that is, reflecting back into the base 1. Figure 8 It can be seen that the second blocking bar 142 also divides the bottom outlet along the Y-axis direction.

[0058] In other embodiments, the barrier unit 14 has various structural forms. Figure 9 As shown, the bar unit 14 includes only one first bar 141 in the Y-axis direction, which divides the bottom opening 12 into a first ventilation area 15 and a second ventilation area 16. The air guide groove 17 in the first ventilation area 15 and the air guide groove 17 in the second ventilation area 16 are arranged in opposite directions. The angle of the air guide groove 17 can be one of 30°, 35°, 40°, 45°, 50°, 55°, and 60°. The position of the first bar 141 at the bottom opening 12 is not limited, but is preferably centered. Figure 10As shown, the bar unit 14 is composed of a first bar 141 in the Y-axis direction and a plurality of second bars 142 in the X-axis direction. The first bar 141 divides the bottom opening 12 into a first ventilation area 15 and a second ventilation area 16, and the second bar 142 divides the first ventilation area 15 and the second ventilation area 16 into three first sub-areas 151 and three second sub-areas 161 respectively. The areas of the three first sub-areas 151 can be different, preferably evenly divided; the areas of the three second sub-areas 161 can be different, preferably evenly divided. Figure 11 As shown, the first ventilation area 15 can be divided into two first sub-areas 151 by the second baffle 142, and the second ventilation area 16 can be divided into three second sub-areas 161 by the second baffle 142, so as to meet the different dynamic and static contact structures of the electrical switch to achieve the best breaking performance.

[0059] Example 2

[0060] The basic structure of this embodiment is the same as that of the first embodiment, except that the base 1 is composed of two seat shells, namely the first seat shell 4 and the second seat shell 4a. Figure 12 and Figure 13 As shown. Raised ribs 41 are provided on both sides of the first housing 4, while recessed grooves 4a1 are provided on both sides of the second housing 4a. When the first and second housings 4a are assembled, the raised ribs 41 slide into the recessed grooves 4a1. Once assembled, the first and second housings 4a form a single unit, achieving a holistic effect. The split arc extinguishing chamber consists of two separate components, the left and right, with a relatively simple design and process structure, resulting in low cost.

[0061] In another embodiment (not shown in the figure), a first protrusion and a first concave block are respectively provided on both sides of the first seat shell 4, and a second protrusion and a second concave block are respectively provided on both sides of the second seat shell 4a. When the first seat shell 4 and the second seat shell 4a are combined, the first protrusion slides and fits into the second concave block, and at the same time, the first concave block slides and fits into the second protrusion.

[0062] Example 3

[0063] This embodiment provides a switch electrical appliance, in which the arc extinguishing chamber assembly of the present invention is installed. The switch electrical appliance has a housing 5, and the arc extinguishing chamber assembly cooperates with the inner wall of the housing 5 to expand the ventilation area to form multiple ventilation chambers 6. Figure 14 As shown, in this embodiment, the bottom opening 12 of the base 1 of the arc-extinguishing chamber assembly is a first curved plane 7, with both sides of the curved plane curving upward toward the top opening 11. The inner wall of the housing 5 facing the bottom opening 12 has a second curved plane 8 with the same curvature. The curvature of the second curved plane 8 is smaller than that of the first curved plane 7, resulting in a shape in which the cross-section of the ventilation chamber 6 gradually increases toward the gas outlet on both sides, providing better guidance for the removal of airflow.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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 chamber assembly, characterized in that: include: A base (1) comprises a top opening (11) and a bottom opening (12); the bottom opening (12) is provided with a blocking unit (14) to separate the bottom opening (12) into at least two ventilation areas; each ventilation area is provided with a guide unit to form an inclined air guide groove (17); the air guide grooves (17) of at least two ventilation areas have different directions; Arc extinguishing grids (2) are arranged in a row inside the base (1); The gas generating part (3) is arranged at the top opening (11).

2. The arc extinguishing chamber assembly according to claim 1, characterized in that: Air outlets (13) are provided on both sides of the base (1), and the outlet of each air guide groove (17) is biased towards the direction of the air outlet (13) closest to it.

3. The arc extinguishing chamber assembly according to claim 1, characterized in that: The baffle unit (14) comprises a first baffle (141) which divides the bottom opening (12) into a first ventilation area (15) and a second ventilation area (16); the air guide groove (17) in the first ventilation area (15) and the air guide groove (17) in the second ventilation area (16) are arranged in opposite directions.

4. The arc extinguishing chamber assembly according to claim 3, characterized in that: The baffle unit (14) further comprises at least one second baffle (142) perpendicular to the first baffle (141), wherein the second baffle (142) divides the first ventilation area (15) into a plurality of first sub-areas (151), and the second baffle (142) divides the second ventilation area (16) into a plurality of second sub-areas (161).

5. The arc extinguishing chamber assembly according to claim 4, characterized in that: The air guide grooves (17) in adjacent first sub-regions (151) and the air guide grooves (17) in adjacent second sub-regions (161) are arranged in a staggered manner.

6. The arc extinguishing chamber assembly according to claim 3, characterized in that: The inclination angle of the air guide groove (17) is 10 degrees to 80 degrees.

7. The arc extinguishing chamber assembly according to claim 3, characterized in that: The bottom opening (12) is an arc plane, and both sides of the arc plane are bent toward the top opening (11).

8. The arc extinguishing chamber assembly according to claim 1, characterized in that: The base (1) consists of a first base shell (4) and a second base shell (4a) combined along the arrangement direction of the arc-extinguishing grid pieces (2).

9. The arc extinguishing chamber assembly according to claim 8, characterized in that: The first seat shell (4) is provided with raised ribs (41) on both sides, and the second seat shell (4a) is provided with recessed grooves (4a1) on both sides. When the first seat shell (4) and the second seat shell (4a) are combined, the raised ribs (41) are slidably engaged with the recessed grooves (4a1). Or the first seat shell (4) is provided with a first protrusion and a first concave block on both sides, and the second seat shell (4a) is provided with a second protrusion and a second concave block on both sides, and when the first seat shell (4) and the second seat shell (4a) are combined, the first protrusion is slidably engaged with the second concave block, and at the same time, the first concave block is slidably engaged with the second protrusion.

10. The arc extinguishing chamber assembly according to claim 1, characterized in that: An embedded groove (31) is provided on one side of the gas generating member (3) for hanging on the edge of the top opening (11), so that the gas generating member (3) partially wraps the edge of the top opening (11).

11. The arc extinguishing chamber assembly according to claim 10, characterized in that: The inner side of the base (1) is provided with a slot (18) for installing the arc-extinguishing grid (2); the gas-generating component (3) has a fixing slot (32) on one side of the embedded slot (31); after the gas-generating component (3) is installed on the top opening (11), the slot (18) and the fixing slot (32) are used together to fix the arc-extinguishing grid (2).

12. A switch electrical appliance, characterized in that: It comprises a shell (5) and an arc extinguishing chamber assembly as claimed in any one of claims 1 to 11, wherein the arc extinguishing chamber assembly is installed in the shell (5), and the arc extinguishing chamber assembly cooperates with the inner wall of the shell (5) to expand the ventilation area to form multiple ventilation chambers (6).

13. The switch electrical device according to claim 12, characterized in that: The bottom opening (12) is a first arc plane (7), both sides of which are bent toward the top opening (11); the inner wall of the shell (5) facing the bottom opening (12) has a second arc plane (8) with the same bending direction, and the curvature of the second arc plane (8) is smaller than that of the first arc plane (7).

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