An arc quenching assembly and a direct current arc quenching chamber

Abstract

The application discloses a kind of arc extinguishing assembly and direct current arc extinguishing chamber, belong to low-voltage electrical apparatus field, a kind of arc extinguishing assembly, including integral arc runner, the rear side of integral arc runner is provided with two groups of split arc runner group, the rear side of split arc runner group is provided with arc guide piece;A kind of direct current arc extinguishing chamber, including arc extinguishing chamber base, the inside of arc extinguishing chamber base is provided with protection assembly, the lower of arc extinguishing chamber base is provided with left side plate and right side plate, left side plate and right side plate are provided with above-mentioned arc extinguishing assembly between, the lower of arc extinguishing assembly is provided with left gas blowing piece and right gas blowing piece.The application is on the basis of existing appearance size, by changing the layout of arc runner to increase the number of arc runner, to realize DC2000V and DC2500V operating voltage requirement;The application is to increase the number of grid piece, increase left and right arrangement scheme design, this arrangement can make the number of arc runner increase 1.5-2 times, greatly improve arc voltage.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical appliances, and more particularly to an arc-extinguishing assembly and a DC arc-extinguishing chamber. Background Technology

[0002] In recent years, the new energy sector has experienced rapid development, particularly in photovoltaic and wind power energy storage. Consequently, the demand for DC circuit breakers and DC disconnect switches used in these systems has increased. Simultaneously, intense competition among manufacturers has led to a gradual increase in operating voltage, currently dominated by DC 1000V and DC 1500V, with a future trend towards DC 2000V and DC 2500V. To meet the demands of high DC voltage, low-voltage components require an increased number of arc-extinguishing grids in the arc-extinguishing chamber; however, the limited dimensions of low-voltage components make it difficult to increase the number of arc-extinguishing grids.

[0003] like Figure 20 The image shows a conventional frame circuit breaker arc-extinguishing chamber in the low-voltage electrical appliance field, typically containing 16-21 arc-extinguishing plates. However, to meet DC 1500V or even DC 2000V operating voltages, the total number of arc-extinguishing plates needs to be increased to over 60. Therefore, there are currently two common industry solutions. The first is a four-pole series voltage divider solution, where 15 plates per pole are sufficient for DC 1500V operating voltage. However, this solution requires ensuring synchronization and stability between each phase of the four poles, and the four-pole product is more expensive. The second solution involves increasing the number of arc-extinguishing plates in a two-pole product. This solution involves widening the arc-extinguishing chamber length, increasing the number of arc-extinguishing plates per phase to 30 or more. This solution requires optimization of the overall frame circuit breaker structure, involves numerous molds, has a long development cycle, high development costs, and requires extensive product verification, making implementation difficult. Summary of the Invention

[0004] The purpose of this invention is to provide an arc-extinguishing component and a DC arc-extinguishing chamber, which solves the problem that the arc-extinguishing chamber cannot be equipped with grid plates under DC1500V to DC2000V voltage due to the structural limitations of existing conventional products.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] An arc extinguishing assembly includes an integral arc extinguishing grid plate, and two sets of split arc extinguishing grid plate groups arranged side by side are provided on the rear side of the integral arc extinguishing grid plate, forming an arc extinguishing gap between the two sets of split arc extinguishing grid plate groups, and an arc-inducing plate is provided on the rear side of the split arc extinguishing grid plate group.

[0007] Furthermore, the integral arc-extinguishing grid plate is provided with a first arc-inducing structure and a second arc-inducing structure on its upper and lower sides, respectively.

[0008] Furthermore, the arc-extinguishing gap gradually decreases in size from bottom to top.

[0009] Furthermore, each set of the split-type arc-extinguishing grid plate group includes several arc-extinguishing grid plate units arranged sequentially from front to back at intervals, and the arc-extinguishing grid plate units in the two sets of the split-type arc-extinguishing grid plate groups are arranged alternately.

[0010] Furthermore, the distance between the two arc-extinguishing grid units on the left and right is set as a, and the distance between the two arc-extinguishing grid units in front and behind is set as b, where b = (1.5-2.5)a.

[0011] A DC arc-extinguishing chamber includes an arc-extinguishing chamber base, a protective assembly is disposed inside the arc-extinguishing chamber base, a left side plate and a right side plate are disposed below the arc-extinguishing chamber base, an arc-extinguishing assembly as described above is disposed between the left side plate and the right side plate, and a left air blowing component and a right air blowing component are disposed below the arc-extinguishing assembly.

[0012] Furthermore, the protective component includes a first bottom flame extinguishing plate and a second bottom flame extinguishing plate, the first bottom flame extinguishing plate being disposed below the second bottom flame extinguishing plate, and a plurality of partitions being disposed between the first bottom flame extinguishing plate and the second bottom flame extinguishing plate.

[0013] Furthermore, a support assembly is provided between the arc extinguishing component and the bottom first flame extinguishing plate. The support assembly includes a front bracket and several middle and rear brackets. The front bracket is disposed between the integral arc extinguishing grid and the bottom first flame extinguishing plate, and the middle and rear brackets are disposed between the arc extinguishing grid unit and the bottom first flame extinguishing plate.

[0014] Furthermore, a fixing bracket is provided between the integral arc-extinguishing grid and the individual arc-extinguishing grid, and between two adjacent individual arc-extinguishing grids.

[0015] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0016] This invention increases the number of arc-extinguishing grids by changing their layout on the existing external dimensions, thereby achieving the DC2000V and DC2500V operating voltage requirements. The invention increases the number of grids by adding a left-right arrangement scheme, which can increase the number of arc-extinguishing grids by 1.5-2 times, greatly improving the arc voltage. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a three-dimensional structural schematic diagram of the arc-extinguishing component of the present invention;

[0019] Figure 2 This is a top view of the arc-extinguishing component of the present invention;

[0020] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0021] Figure 4 This is a front view of the integral arc-extinguishing grid sheet of the present invention;

[0022] Figure 5 This is a front view of the two-component split arc-extinguishing grid assembly of the present invention;

[0023] Figure 6 This is a diagram showing the calculation formula for the arrangement of the split-type arc-extinguishing grid plate group of the present invention;

[0024] Figure 7 This is a three-dimensional structural schematic diagram of the DC arc-extinguishing chamber of the present invention;

[0025] Figure 8 This is a cross-sectional view of the DC arc-extinguishing chamber of the present invention;

[0026] Figure 9 This is a schematic diagram showing the positional relationship between the first bottom flame extinguishing plate, the second bottom flame extinguishing plate, and the partition plate of the present invention;

[0027] Figure 10 This is a three-dimensional structural schematic diagram of the arc-extinguishing chamber base of the present invention;

[0028] Figure 11 This is a three-dimensional structural diagram of the front support of the present invention from a frontal view.

[0029] Figure 12 This is a three-dimensional structural diagram of the front bracket of the present invention viewed from the rear.

[0030] Figure 13 This is a schematic diagram of the front bracket installation state of the present invention;

[0031] Figure 14 This is a schematic diagram of the front bracket installation state from another angle.

[0032] Figure 15 This is a three-dimensional structural diagram of the rear support in this invention, viewed from the front.

[0033] Figure 16 This is a three-dimensional structural diagram of the rear support frame from the rear view angle in this invention;

[0034] Figure 17 This is a three-dimensional structural diagram of the fixing bracket of the present invention;

[0035] Figure 18 This is a three-dimensional structural diagram of the left air blowing component of the present invention;

[0036] Figure 19 This is a diagram showing the trajectory of the electric arc in this invention;

[0037] Figure 20This is the arc-extinguishing chamber of a conventional frame circuit breaker in the existing technology.

[0038] Explanation of reference numerals in the attached drawings: 1. Integral arc-extinguishing grid plate; 1-1. First arc-initiating structure; 1-2. Second arc-initiating structure; 1-3. First protrusion; 1-4. First mounting hole; 2. Split arc-extinguishing grid plate assembly; 3. Arc-initiating plate; 2-1. Single arc-extinguishing grid plate; 2-1-1. Left first arc-extinguishing grid plate; 2-1-2. Right first arc-extinguishing grid plate; 2-1-3. Left second arc-extinguishing grid plate; 2-1-4. Right second arc-extinguishing grid plate; 4. Arc-extinguishing chamber base; 4-1. Third protrusion; 5. Left side panel; 6. Right side panel; 7. Left air blower; 7-1. Slot; 7-2. Fourth protrusion; 8. Right air blower; 9. Bottom first flame extinguishing plate; 10. Bottom second flame extinguishing plate; 11. Partition; 12. Front bracket; 12-1. First connecting post; 12-2. First mounting slot; 13. Middle and rear bracket; 13-1. Mounting hole; 13-2. Second connecting post; 13-3. Second mounting slot; 14. Fixed bracket; 14-1. Third mounting slot; 14-2. Third connecting post. Detailed Implementation

[0039] like Figure 1-6 As shown, an arc extinguishing assembly includes an integral arc extinguishing grid plate 1. Two sets of separate arc extinguishing grid plate groups 2 are arranged side-by-side on the rear side of the integral arc extinguishing grid plate 1. An arc extinguishing gap is formed between the two sets of separate arc extinguishing grid plate groups 2. Each set of separate arc extinguishing grid plate groups 2 includes several arc extinguishing grid plate units 2-1 arranged sequentially from front to back at intervals. The arc extinguishing grid plate units 2-1 in the two sets of separate arc extinguishing grid plate groups 2 are arranged alternately. An arc-inducing plate 3 is provided on the rear side of the separate arc extinguishing grid plate group 2.

[0040] like Figure 3 As shown, during the breaking process of the frame circuit breaker, the electric arc first passes through the integral arc-extinguishing grid 1, and then sequentially passes through the left first arc-extinguishing grid unit 2-1-1, the right first arc-extinguishing grid unit 2-1-2, the left second arc-extinguishing grid unit 2-1-3, the right second arc-extinguishing grid unit 2-1-4, and so on, until it reaches the arc-initiating plate 3 to complete the overall arc-drawing process. During this process, the structure of the integral arc-extinguishing grid 1, the left first arc-extinguishing grid unit 2-1-1, the right first arc-extinguishing grid unit 2-1-2, the left second arc-extinguishing grid unit 2-1-3, the right second arc-extinguishing grid unit 2-1-4, and so on, allows the electric arc to enter the arc-extinguishing grid units sequentially from the middle position.

[0041] like Figure 4 As shown, the integral arc-extinguishing grid plate 1 is provided with a first arc-inducing structure 1-1 and a second arc-inducing structure 1-2 on the upper and lower sides, which can effectively guide the electric arc to the middle position of the arc-extinguishing grid plate.

[0042] like Figure 5As shown, the arc-extinguishing gap gradually decreases from bottom to top. The smaller the gap, the easier it is for the electric arc to break down. This arc-extinguishing gap is beneficial for introducing the electric arc into the arc-extinguishing grid.

[0043] like Figure 6 As shown, the distance between the two arc-extinguishing grid units 2-1 on the left and right is set as a, and the distance between the two arc-extinguishing grid units 2-1 in front and behind is set as b, b = (1.5-2.5)a, where a and b are in mm.

[0044] Based on the above, Figure 1-6 The arc-extinguishing assembly shown in this embodiment also provides a DC arc-extinguishing chamber, such as... Figure 7-18 As shown, the DC arc-extinguishing chamber includes an arc-extinguishing chamber base 4. A protective component is installed inside the arc-extinguishing chamber base 4. A left side plate 5 and a right side plate 6 are installed below the arc-extinguishing chamber base 4. An arc-extinguishing component as described above is arranged between the left side plate 5 and the right side plate 6. A left air blowing component 7 and a right air blowing component 8 are arranged below the arc-extinguishing component.

[0045] like Figure 9 As shown, the protective assembly includes a bottom first flame extinguishing plate 9 and a bottom second flame extinguishing plate 10. The bottom first flame extinguishing plate 9 and the bottom second flame extinguishing plate 10 are installed inside the arc extinguishing chamber base 4. The bottom first flame extinguishing plate 9 is positioned above the bottom second flame extinguishing plate 10. Both the bottom first flame extinguishing plate 9 and the bottom second flame extinguishing plate 10 have several small holes. Three partitions 11 are installed between the bottom first flame extinguishing plate 9 and the bottom second flame extinguishing plate 10.

[0046] A support assembly is provided between the arc extinguishing component and the bottom first flame extinguishing plate 9. The support assembly includes a front bracket 12 and several middle and rear brackets 13. The front bracket 12 is disposed between the integral arc extinguishing grid plate 1 and the bottom first flame extinguishing plate 9, and the middle and rear brackets 13 are disposed between the arc extinguishing grid plate unit 2-1 and the bottom first flame extinguishing plate 9.

[0047] The integral arc-extinguishing grid plate 1 has first protrusions 1-3 connected to the left and right sides, and mounting grooves matching the first protrusions 1-3 are opened on the left side plate 5 and the right side plate 6; the top of the integral arc-extinguishing grid plate 1 has two first mounting holes 1-4 that match the third connecting post 14-2 of the fixed bracket 14.

[0048] The left side of the left first arc-extinguishing grid unit 2-1-1 and the right side of the right first arc-extinguishing grid unit 2-1-2 are both connected to a second protrusion, which matches the mounting groove on the left side plate 5 and the right side plate 6. The top right side of the left first arc-extinguishing grid unit 2-1-1 and the top left side of the right first arc-extinguishing grid unit 2-1-2 are provided with a second mounting hole that matches the third connecting post 14-2 of the fixed bracket 14.

[0049] like Figure 10 As shown, the left and right sides of the arc-extinguishing chamber base 4 are connected to the third protrusion 4-1 that matches the mounting grooves on the left side plate 5 and the right side plate 6; the arc-extinguishing chamber base 4 can ensure that all flame extinguishing plates are installed from the inside and has a certain mechanical strength; the external reinforcing ribs on the arc-extinguishing chamber base 4 can effectively cut the electric arc, and holes are provided between adjacent reinforcing ribs.

[0050] like Figure 11-12 As shown, the front bracket 12 is connected to two first connecting posts 12-1, and the left rear side of the front bracket 12 is provided with a first mounting groove 12-2 for installing the arc extinguishing grid unit 2-1.

[0051] like Figure 13-14 As shown, during installation, the integral arc-extinguishing grid 1 is installed on the front side of the front bracket 12. The front ends of the two first connecting posts 12-1 are respectively inserted into the two first mounting holes 1-4. The left first arc-extinguishing grid unit 2-1-1 is installed in the first mounting groove 12-2, and the right first arc-extinguishing grid unit 2-1-2 is installed on the right rear side of the front bracket 12. The rear ends of the two first connecting posts 12-1 pass through the second mounting holes of the left first arc-extinguishing grid unit 2-1-1 and the right first arc-extinguishing grid unit 2-1-2 respectively, and are then inserted into the third mounting groove 14-1 of the fixed bracket 14. The third connecting post 14-2 passes through the second mounting holes of the left second arc-extinguishing grid unit 2-1-3 and the right second arc-extinguishing grid unit 2-1-4, and is then inserted into the third mounting groove 14-1 of another fixed bracket 14. This installation method is performed sequentially.

[0052] like Figure 15-16 As shown, the front side of the middle and rear bracket 13 has two mounting holes 13-1, the rear side of the middle and rear bracket 13 is connected to two second connecting posts 13-2, and the right front side and left rear side of the middle and rear bracket 13 have second mounting slots 13-3. During installation, the two arc-extinguishing grid units 2-1 are respectively installed in the two second mounting slots 13-3, the third connecting post 14-2 of one fixed bracket 14 is inserted into the mounting hole 13-1, and the second connecting post 13-2 is inserted into the third mounting slot 14-1 of the other fixed bracket 14.

[0053] like Figure 17 As shown, a third mounting groove 14-1 is provided on one side of the fixed bracket 14, and a third connecting column 14-2 is connected to the other side of the fixed bracket 14.

[0054] In actual operation, because the electric arc will move upward, the front support 12 and the middle and rear supports 13 are made of DMC material (insulating material), which can prevent the electric arc from cutting the arc as it is ejected outward.

[0055] like Figure 18As shown, the left air blowing component 7 is provided with several slots 7-1 for installing the integral arc extinguishing grid plate 1 and the arc extinguishing grid plate unit 2-1. The left side of the left air blowing component 7 is connected to multiple fourth protrusions 7-2, which match the mounting grooves on the left side plate 5. The right air blowing component 8 has the same structure as the left air blowing component 7, and will not be described in detail here. The right air blowing component 8 is symmetrically arranged with the left air blowing component 7.

[0056] The working process of this invention is as follows:

[0057] First, during the breaking process of the frame circuit breaker, the electric arc will first pass through the integral arc extinguishing grid 1, and then sequentially pass through the left first arc extinguishing grid unit 2-1-1, the right first arc extinguishing grid unit 2-1-2, the left second arc extinguishing grid unit 2-1-3, the right second arc extinguishing grid unit 2-1-4, and so on until the arc ignition piece 3 completes the overall arc pulling process. During this process, the structure of the integral arc-extinguishing grid 1, the left first arc-extinguishing grid unit 2-1-1, the right first arc-extinguishing grid unit 2-1-2, the left second arc-extinguishing grid unit 2-1-3, the right second arc-extinguishing grid unit 2-1-4, and so on, allows the arc to enter the arc-extinguishing grid sequentially from the middle position. Simultaneously, as the arc enters backward, it is also ejected upward. This process is blocked by the front support 12 and the middle and rear supports 13, cutting the arc and preventing it from penetrating the back of the arc-extinguishing grid. The arc then passes sequentially through the bottom first flame extinguishing plate 9, the bottom second flame extinguishing plate 10, and the arc-extinguishing chamber base 4. Throughout this process, most of the arc is extinguished within the arc-extinguishing grid, while a small portion is extinguished by the bottom first flame extinguishing plate 9 and the bottom second flame extinguishing plate 10. This achieves the effect of overall arc extinguishing.

[0058] When a DC circuit is broken, the current cannot be interrupted instantaneously, resulting in an electric arc between the contacts. By lengthening the arc, its resistance is increased. According to Ohm's law, increased resistance reduces the arc current, thus lowering the arc's energy and eventually extinguishing it. Figure 19 As shown, the entire arc-extinguishing process can be divided into three parts:

[0059] Part 1: The electric arc is drawn along the solid black line to increase its length, thereby increasing its resistance.

[0060] Part Two: The arc travels upwards (the arc travels upwards along the arc-extinguishing gaps that gradually narrow from bottom to top), eventually reaching the black dotted line. The arc-extinguishing grid cuts the arc into smaller arcs (an arc has a near-anode region, an arc column region, and a near-cathode region; the arc-extinguishing grid divides the entire arc into smaller arcs, each with its own near-anode, arc column, and near-cathode region. Due to the small gaps between the arc-extinguishing grids, the voltage in the arc column region is negligible; only the near-anode voltage needs to be calculated). The voltage drop of each smaller arc is relatively small, and the total voltage drop of the arc increases. Arc extinguishing only occurs when the arc voltage exceeds the test voltage.

[0061] Part Three: Locations of the black and white arrows. The first and second flame extinguishing plates 9 and 10 at the bottom are primarily designed to prevent arc reignition. Due to the high test voltage, back-side breakdown is easily caused during connection and disconnection. Adding insulating partitions can effectively reduce the risk of back-side breakdown.

[0062] This invention extinguishes the arc through the combined action of multiple structures. By elongating the arc, extinguishing the arc through slits, and utilizing the arc-extinguishing medium, the arc is extinguished in a comprehensive manner, thereby ensuring the safe disconnection of the DC circuit.

[0063] This invention relates to a design that increases the number of arc-extinguishing grid plates and their left-right arrangement. This arrangement can increase the number of arc-extinguishing grid plates by 1.5-2 times, significantly improving the arc voltage. Furthermore, this arrangement allows the frame circuit breaker to operate according to... Figure 3 The indicated path leads into the arc-extinguishing chamber.

[0064] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. An arc-extinguishing component, characterized in that: The system includes an integral arc-extinguishing grid plate (1), and two sets of split arc-extinguishing grid plate groups (2) arranged side by side on the rear side of the integral arc-extinguishing grid plate (1). An arc-extinguishing gap is formed between the two sets of split arc-extinguishing grid plate groups (2), and the arc-extinguishing gap gradually decreases from bottom to top. An arc-inducing plate (3) is provided on the rear side of the split arc-extinguishing grid plate group (2). Each set of split arc-extinguishing grid plate groups (2) includes several arc-extinguishing grid plate units (2-1) arranged sequentially from front to back. The arc-extinguishing grid plate units (2-1) in the two sets of split arc-extinguishing grid plate groups (2) are arranged alternately. The distance between the two left and right arc-extinguishing grid plate units (2-1) is set as a, and the distance between the two front and rear arc-extinguishing grid plate units (2-1) is set as b, where b = (1.5-2.5)a.

2. The arc-extinguishing assembly according to claim 1, characterized in that: The integral arc-extinguishing grid plate (1) is provided with a first arc-inducing structure (1-1) and a second arc-inducing structure (1-2) on its upper and lower sides respectively.

3. A DC arc-extinguishing chamber, characterized in that: The device includes an arc-extinguishing chamber base (4), the interior of which is provided with a protective assembly. A left side plate (5) and a right side plate (6) are provided below the arc-extinguishing chamber base (4). An arc-extinguishing assembly as described in any one of claims 1-2 is provided between the left side plate (5) and the right side plate (6). A left air blowing component (7) and a right air blowing component (8) are provided below the arc-extinguishing assembly.

4. The DC arc-extinguishing chamber according to claim 3, characterized in that: The protective assembly includes a bottom first flame extinguishing plate (9) and a bottom second flame extinguishing plate (10). The bottom first flame extinguishing plate (9) is located below the bottom second flame extinguishing plate (10), and a plurality of partitions (11) are provided between the bottom first flame extinguishing plate (9) and the bottom second flame extinguishing plate (10).

5. The DC arc-extinguishing chamber according to claim 4, characterized in that: A support assembly is provided between the arc extinguishing component and the bottom first flame extinguishing plate (9). The support assembly includes a front bracket (12) and several middle and rear brackets (13). The front bracket (12) is located between the integral arc extinguishing grid plate (1) and the bottom first flame extinguishing plate (9). The middle and rear brackets (13) are located between the arc extinguishing grid plate unit (2-1) and the bottom first flame extinguishing plate (9).

6. The DC arc-extinguishing chamber according to claim 5, characterized in that: A fixing bracket (14) is provided between the integral arc extinguishing grid (1) and the arc extinguishing grid unit (2-1), and between two adjacent arc extinguishing grid units (2-1).

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