Arc extinguishing assembly and direct current arc extinguishing chamber

Abstract

The invention discloses an arc extinguishing assembly and a direct-current arc extinguishing chamber, and belongs to the field of low-voltage electrical appliances, the arc extinguishing assembly comprises an integral arc extinguishing grid sheet, two split arc extinguishing grid sheet groups are arranged on the rear side of the integral arc extinguishing grid sheet, and arc striking sheets are arranged on the rear sides of the split arc extinguishing grid sheet groups; a direct current arc extinguish chamber comprises an arc extinguish chamber base, a protection assembly is arranged in the arc extinguish chamber base, a left side plate and a right side plate are arranged below the arc extinguish chamber base, the arc extinguish assembly is arranged between the left side plate and the right side plate, and a left air blowing piece and a right air blowing piece are arranged below the arc extinguish assembly. On the basis of the existing boundary dimension, the number of the arc extinguishing grid plates is increased by changing the layout of the arc extinguishing grid plates, so that the working voltage requirements of DC2000V and DC2500V are met; in order to increase the number of the grid sheets and increase the scheme design of left and right arrangement, the arrangement mode can increase the number of the arc extinguishing grid sheets by 1.5-2 times, and the arc voltage is greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of low-voltage electrical appliances, and particularly to an arc extinguishing component and a DC arc extinguishing chamber. Background Art

[0002] In recent years, the new energy field has developed rapidly, especially in the fields of photovoltaic and wind power energy storage. Therefore, the demand for DC circuit breakers and DC disconnectors used inside has increased. At the same time, competition among manufacturers is fierce, and the working voltage is gradually increasing. Currently, the mainstream voltages are DC1000V and DC1500V, and there is even a trend to increase to DC2000V and DC2500V in the future. To meet the DC high voltage, low-voltage components need to increase the number of arc extinguishing grid plates in the arc extinguishing chamber. However, the external dimensions of low-voltage components are limited, making it difficult to increase the arc extinguishing grid plates.

[0003] Such as Figure 20 shown in the figure is the arc extinguishing chamber of a conventional frame circuit breaker in the field of low-voltage electrical appliances. The number of such arc extinguishing grid plates generally ranges from 16 to 21. However, if one wants to meet the working voltage of DC1500V or even DC2000V, the total number of arc extinguishing grid plates needs to be increased to more than 60. Therefore, there are currently two conventional industry solutions. The first is the series voltage division scheme for four-pole products. This scheme can meet the DC1500V working voltage with 15 plates per stage, but this scheme needs to meet the synchronization and stability problems between each phase of the four poles, and the cost of four-pole products is relatively high. The second is the scheme of increasing the arc extinguishing grid plates for two-pole products. This scheme widens the length of the arc extinguishing chamber to increase the number of arc extinguishing grid plates per phase to 30 or more. This scheme requires optimizing the overall structure of the frame circuit breaker, with a large number of mold openings, a long development cycle, a high development cost, and a large amount of product verification is required later, making it difficult to implement. Summary of the Invention

[0004] The purpose of the present invention is to provide an arc extinguishing component and a DC arc extinguishing chamber to solve the problem that the arc extinguishing chamber cannot increase the grid plates under the voltage of DC1500V to DC2000V due to the structural limitations of existing conventional products.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions:

[0006] An arc extinguishing component includes an integral arc extinguishing grid plate. Two groups of split arc extinguishing grid plate groups are arranged side by side left and right at the rear side of the integral arc extinguishing grid plate. An arc extinguishing gap is formed between the two groups of split arc extinguishing grid plate groups. An arc guiding plate is arranged at the rear side of the split arc extinguishing grid plate group.

[0007] Further, a first arc guiding structure and a second arc guiding structure are respectively arranged on the upper and lower sides of the integral arc extinguishing grid plate.

[0008] Still further, the arc extinguishing gap gradually becomes smaller from bottom to top.

[0009] Furthermore, each set of the split arc extinguishing grid sheet groups includes a plurality of arc extinguishing grid sheet monomers arranged at intervals in sequence from front to back, and the arc extinguishing grid sheet monomers in the two sets of split arc extinguishing grid sheet groups are arranged staggeredly.

[0010] Furthermore, the distance between the left and right arc extinguishing grid sheet monomers is set to a, and the distance between the front and back arc extinguishing grid sheet monomers is set to b, and b = (1.5 - 2.5)a.

[0011] A DC arc extinguishing chamber includes an arc extinguishing chamber base. A protection component is arranged inside the arc extinguishing chamber base. A left side plate and a right side plate are arranged below the arc extinguishing chamber base. An arc extinguishing component as described above is arranged between the left side plate and the right side plate. A left air blowing part and a right air blowing part are arranged below the arc extinguishing component.

[0012] Furthermore, the protection component includes a bottom first flame extinguishing sheet and a bottom second flame extinguishing sheet. The bottom first flame extinguishing sheet is arranged below the bottom second flame extinguishing sheet. A plurality of partition plates are arranged between the bottom first flame extinguishing sheet and the bottom second flame extinguishing sheet.

[0013] Furthermore, a support component is arranged between the arc extinguishing component and the bottom first flame extinguishing sheet. The support component includes a front bracket and a plurality of middle and rear brackets. The front bracket is arranged between the integral arc extinguishing grid sheet and the bottom first flame extinguishing sheet. The middle and rear brackets are arranged between the arc extinguishing grid sheet monomers and the bottom first flame extinguishing sheet.

[0014] Furthermore, fixing brackets are arranged between the integral arc extinguishing grid sheet and the arc extinguishing grid sheet monomers, and between adjacent two arc extinguishing grid sheet monomers.

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

[0016] Based on the existing external dimensions, the present invention increases the number of arc extinguishing grid sheets by changing the layout of the arc extinguishing grid sheets, and further realizes the working voltage requirements of DC2000V and DC2500V. In order to increase the number of grid sheets, the present invention designs a scheme of arranging them left and right. This arrangement can increase the number of arc extinguishing grid sheets by 1.5 - 2 times, greatly improving the arc voltage. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0020] Figure 3 The enlarged view of part A in Figure 2 ; the front view of the integral arc extinguishing grid sheet of the present invention

[0021] Figure 4 ; the front view of two groups of split arc extinguishing grid sheet groups of the present invention

[0022] Figure 5 ; the layout calculation formula diagram of the split arc extinguishing grid sheet group of the present invention

[0023] Figure 6 ; the three-dimensional structure schematic diagram of the DC arc extinguishing chamber of the present invention

[0024] Figure 7 ; the cross-sectional view of the DC arc extinguishing chamber of the present invention

[0025] Figure 8 ; the schematic diagram of the positional relationship among the first flame extinguishing piece at the bottom, the second flame extinguishing piece at the bottom and the partition of the present invention

[0026] Figure 9 ; the three-dimensional structure schematic diagram of the arc extinguishing chamber base of the present invention

[0027] Figure 10 ; the three-dimensional structure schematic diagram of the front bracket of the present invention from the front view angle

[0028] Figure 11 ; the three-dimensional structure schematic diagram of the front bracket of the present invention from the rear view angle

[0029] Figure 12 ; the schematic diagram of the installation state of the front bracket of the present invention

[0030] Figure 13 ; the schematic diagram of the installation state of the front bracket of the present invention from another angle

[0031] Figure 14 ; the three-dimensional structure schematic diagram of the middle and rear bracket of the present invention from the front view angle

[0032] Figure 15 ; the three-dimensional structure schematic diagram of the middle and rear bracket of the present invention from the rear view angle

[0033] Figure 16 ; the three-dimensional structure schematic diagram of the fixed bracket of the present invention

[0034] Figure 17 ; the three-dimensional structure schematic diagram of the left air blowing part of the present invention

[0035] Figure 18 ; the three-dimensional structure schematic diagram of the arc of the present invention

[0036] Figure 19 ; the running direction diagram of the arc of the present invention

[0037] Figure 20It is the arc extinguishing chamber of a conventional frame circuit breaker in the prior art.

[0038] Description of reference numerals: 1. Integral arc extinguishing grid; 1-1. First arc guiding structure; 1-2. Second arc guiding structure; 1-3. First protrusion; 1-4. First mounting hole; 2. Split arc extinguishing grid group; 3. Arc guiding piece; 2-1. Arc extinguishing grid monomer; 2-1-1. Left first arc extinguishing grid monomer; 2-1-2. Right first arc extinguishing grid monomer; 2-1-3. Left second arc extinguishing grid monomer; 2-1-4. Right second arc extinguishing grid monomer; 4. Arc extinguishing chamber base; 4-1. Third protrusion; 5. Left side plate; 6. Right side plate; 7. Left air blowing part; 7-1. Slot; 7-2. Fourth protrusion; 8. Right air blowing part; 9. First bottom flame extinguishing piece; 10. Second bottom flame extinguishing piece; 11. Partition board; 12. Front bracket; 12-1. First connecting column; 12-2. First mounting groove; 13. Middle and rear bracket; 13-1. Mounting hole; 13-2. Second connecting column; 13-3. Second mounting groove; 14. Fixed bracket; 14-1. Third mounting groove; 14-2. Third connecting column. Detailed implementation manners

[0039] As Figures 1-6 shown, an arc extinguishing assembly includes an integral arc extinguishing grid 1. There are two groups of split arc extinguishing grid groups 2 arranged side by side left and right at the rear side of the integral arc extinguishing grid 1. An arc extinguishing gap is formed between the two groups of split arc extinguishing grid groups 2. Each group of split arc extinguishing grid groups 2 includes a plurality of arc extinguishing grid monomers 2-1 arranged at intervals from front to back. The arc extinguishing grid monomers 2-1 in the two groups of split arc extinguishing grid groups 2 are arranged staggeredly. An arc guiding piece 3 is arranged at the rear side of the split arc extinguishing grid group 2.

[0040] As Figure 3 shown, during the breaking process of the frame circuit breaker, the arc will first pass through the integral arc extinguishing grid 1, and sequentially pass through the left first arc extinguishing grid monomer 2-1-1, the right first arc extinguishing grid monomer 2-1-2, the left second arc extinguishing grid monomer 2-1-3, the right second arc extinguishing grid monomer 2-1-4... until reaching the arc guiding piece 3 to complete the overall arc drawing process; during this process, the structures of the integral arc extinguishing grid 1, the left first arc extinguishing grid monomer 2-1-1, the right first arc extinguishing grid monomer 2-1-2, the left second arc extinguishing grid monomer 2-1-3, the right second arc extinguishing grid monomer 2-1-4... and other arc extinguishing grids can enable the arc to enter the rear arc extinguishing grids sequentially at the middle position.

[0041] As Figure 4 shown, the first arc guiding structure 1-1 and the second arc guiding structure 1-2 are respectively arranged on the upper and lower sides of the integral arc extinguishing grid 1, which can effectively guide the arc to the middle position of the arc extinguishing grid.

[0042] As Figure 5As shown, the arc extinguishing gap gradually becomes smaller from bottom to top. The smaller the gap, the easier it is for the electric arc to break through. Thus, the arc extinguishing gap is conducive to introducing the electric arc into the arc extinguishing grid plates inside.

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

[0044] Based on the above arc extinguishing component as Figures 1-6 shown, in this embodiment, a DC arc extinguishing chamber is further provided. As Figures 7-18 shown, the DC arc extinguishing chamber includes an arc extinguishing chamber base 4. A protection 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. The above-mentioned arc extinguishing component is arranged between the left side plate 5 and the right side plate 6. A left air blowing part 7 and a right air blowing part 8 are arranged below the arc extinguishing component.

[0045] As Figure 9 shown, the protection component includes a bottom first flame extinguishing sheet 9 and a bottom second flame extinguishing sheet 10. The bottom first flame extinguishing sheet 9 and the bottom second flame extinguishing sheet 10 are installed inside the arc extinguishing chamber base 4. The bottom first flame extinguishing sheet 9 is arranged above the bottom second flame extinguishing sheet 10. A number of small holes are opened on both the bottom first flame extinguishing sheet 9 and the bottom second flame extinguishing sheet 10. Three partition plates 11 are installed between the bottom first flame extinguishing sheet 9 and the bottom second flame extinguishing sheet 10.

[0046] A support component is arranged between the arc extinguishing component and the bottom first flame extinguishing sheet 9. The support component includes a front support 12 and a number of middle and rear supports 13. The front support 12 is arranged between the integral arc extinguishing grid plate 1 and the bottom first flame extinguishing sheet 9. The middle and rear supports 13 are arranged between the arc extinguishing grid plate monomer 2-1 and the bottom first flame extinguishing sheet 9.

[0047] Both the left and right sides of the integral arc extinguishing grid plate 1 are connected with first protrusions 1-3. Installation grooves matching the first protrusions 1-3 are opened on the left side plate 5 and the right side plate 6. Two first installation holes 1-4 matching the third connection columns 14-2 of the fixed support 14 are opened at the top of the integral arc extinguishing grid plate 1.

[0048] Both the left side of the left first arc extinguishing grid plate monomer 2-1-1 and the right side of the right first arc extinguishing grid plate monomer 2-1-2 are connected with second protrusions, and the second protrusions match the installation grooves on the left side plate 5 and the right side plate 6. Second installation holes matching the third connection columns 14-2 of the fixed support 14 are opened at the top right of the left first arc extinguishing grid plate monomer 2-1-1 and the top left of the right first arc extinguishing grid plate monomer 2-1-2.

[0049] As Figure 10 shown, third protrusions 4-1 matching the mounting grooves on the left and right side plates 5 and 6 are connected to the left and right sides of the arc extinguishing chamber base 4; the arc extinguishing chamber base 4 can ensure that all the flame extinguishing pieces 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] As Figures 11-12 shown, two first connecting columns 12-1 are connected to the front bracket 12, and a first mounting groove 12-2 for installing the arc extinguishing grid piece monomer 2-1 is provided on the left rear side of the front bracket 12.

[0051] As Figures 13-14 shown, during installation, the integral arc extinguishing grid piece 1 is installed on the front side of the front bracket 12, the front ends of the two first connecting columns 12-1 are respectively inserted into the two first mounting holes 1-4, the left first arc extinguishing grid piece monomer 2-1-1 is installed in the first mounting groove 12-2, the right first arc extinguishing grid piece monomer 2-1-2 is installed on the right rear side of the front bracket 12, the rear ends of the two first connecting columns 12-1 respectively pass through the second mounting holes of the left first arc extinguishing grid piece monomer 2-1-1 and the right first arc extinguishing grid piece monomer 2-1-2 and then are inserted into the third mounting groove 14-1 of the fixed bracket 14, and the third connecting column 14-2 passes through the second mounting holes of the left second arc extinguishing grid piece monomer 2-1-3 and the right second arc extinguishing grid piece monomer 2-1-4 and then is inserted into the third mounting groove 14-1 of another fixed bracket 14, and the installation is carried out in this way successively.

[0052] As Figures 15-16 shown, two mounting holes 13-1 are provided on the front side of the middle and rear bracket 13, two second connecting columns 13-2 are connected to the rear side of the middle and rear bracket 13, and second mounting grooves 13-3 are provided on the right front side and the left rear side of the middle and rear bracket 13; during installation, two arc extinguishing grid piece monomers 2-1 are respectively installed in the two second mounting grooves 13-3, the third connecting column 14-2 of a fixed bracket 14 is inserted into the mounting hole 13-1, and the second connecting column 13-2 is inserted into the third mounting groove 14-1 of another fixed bracket 14.

[0053] As Figure 17 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] During the actual working process, because the electric arc will go upward, the front bracket 12 and the middle and rear bracket 13 are made of DMC material (insulating material), which can prevent the electric arc from being cut during the process of spraying outwards.

[0055] As Figure 18As shown in the figure, several slots 7-1 for installing the integral arc extinguishing grid 1 and the single arc extinguishing grid 2-1 are provided on the left air blowing part 7. A plurality of fourth protrusions 7-2 are connected to the left side of the left air blowing part 7, and the fourth protrusions 7-2 are matched with the installation grooves on the left side plate 5; the right air blowing part 8 has the same structure as the left air blowing part 7, which will not be elaborated here, and the right air blowing part 8 and the left air blowing part 7 are symmetrically arranged.

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

[0057] First, during the breaking process of the frame circuit breaker, the arc will first pass through the integral arc extinguishing grid 1, and successively pass through the left first single arc extinguishing grid 2-1-1, the right first single arc extinguishing grid 2-1-2, the left second single arc extinguishing grid 2-1-3, the right second single arc extinguishing grid 2-1-4... until reaching the arc guiding piece 3 to complete the overall arc drawing process. During this process, the structures of the integral arc extinguishing grid 1, the left first single arc extinguishing grid 2-1-1, the right first single arc extinguishing grid 2-1-2, the left second single arc extinguishing grid 2-1-3, the right second single arc extinguishing grid 2-1-4... and other arc extinguishing grids can make the arc enter the rear arc extinguishing grid successively at the middle position; at the same time, during the process of the arc entering backward, the arc will also spray upward, and this process will pass through the blocking of the front bracket 12 and the middle and rear brackets 13, cutting the arc to prevent the arc from breaking through the back of the arc extinguishing grid; then the arc passes through the bottom first flame extinguishing piece 9, the bottom second flame extinguishing piece 10 and the arc extinguishing chamber base 4 in turn. During the whole process, most of the arcs will be extinguished in the arc extinguishing grid, and a small part of the arcs will be extinguished under the action of the bottom first flame extinguishing piece 9 and the bottom second flame extinguishing piece 10. Thus, the overall arc extinguishing effect is achieved.

[0058] When the DC circuit is disconnected, the current cannot be interrupted instantaneously, and an arc will be generated between the contacts. By stretching the arc and increasing the length of the arc, the resistance of the arc is increased. According to Ohm's law, when the resistance increases, the arc current decreases, and the energy of the arc also decreases accordingly, and finally the arc is extinguished. As Figure 19 shown, the whole arc extinguishing process can be divided into three parts:

[0059] The first part: The arc is drawn according to the black solid line to increase the length of the arc, thereby increasing the resistance of the arc.

[0060] The second part: The arc moves upward (the arc moves upward along the arc extinguishing gap that gradually becomes smaller from bottom to top) and gradually reaches the black dotted line. The arc extinguishing grid cuts the arc into small arcs one by one (the arc has a near-anode region, an arc column region, and a near-cathode region. The arc extinguishing grid can cut the entire arc into small arcs, and each small arc also has a near-anode region, an arc column region, and a near-cathode region. Since the gap between the arc extinguishing grids is relatively small, the voltage of the arc column region can be ignored, and only the near-pole voltage needs to be calculated). The voltage drop of each small arc is relatively small, and the total voltage drop of the arc will increase. The arc can be extinguished only when the arc voltage exceeds the test voltage).

[0061] The third part: The positions of the black arrow and the white arrow. The main function of the first flame extinguishing piece 9 and the second flame extinguishing piece 10 at the bottom is to prevent the arc from reigniting. Since the test voltage is relatively high, back breakdown is likely to occur during make-and-break operations. Adding an insulating partition can effectively reduce the risk of back breakdown).

[0062] The present invention extinguishes the arc through the combined action of multiple structures. By means of stretching the arc, slit arc extinguishing, using arc extinguishing media, etc., the arc is extinguished comprehensively, thereby ensuring the safe interruption of the DC circuit).

[0063] In order to increase the number of grid pieces, the present invention designs a layout with left-right arrangement. This layout can increase the number of arc extinguishing grid pieces by 1.5 - 2 times, greatly increasing the arc voltage; and this layout enables the frame circuit breaker to enter the interior of the arc extinguishing chamber along the Figure 3 shown path during the breaking process).

[0064] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention).

Claims

1. An arc extinguishing component, characterized in that: It includes an integral arc extinguishing grid (1). At the rear side of the integral arc extinguishing grid (1), there are two sets of split arc extinguishing grid groups (2) arranged side by side left and right. An arc extinguishing gap is formed between the two sets of split arc extinguishing grid groups (2). At the rear side of the split arc extinguishing grid group (2), there is an arcing piece (3).

2. The arc extinguishing component according to claim 1, wherein: At the upper and lower sides of the integral arc extinguishing grid (1), there are a first arcing structure (1-1) and a second arcing structure (1-2) respectively.

3. The arc extinguishing component according to claim 1, characterized in that: The arc extinguishing gap gradually becomes smaller from bottom to top.

4. The arc extinguishing component according to claim 1, characterized in that: Each set of split arc extinguishing grid groups (2) includes a number of arc extinguishing grid monomers (2-1) arranged at intervals in sequence from front to back. The arc extinguishing grid monomers (2-1) in the two sets of split arc extinguishing grid groups (2) are arranged staggeredly.

5. The arc extinguishing component according to claim 4, characterized in that: The distance between the left and right arc extinguishing grid monomers (2-1) is set as a, and the distance between the front and rear arc extinguishing grid monomers (2-1) is set as b, and b = (1.5 - 2.5)a.

6. A DC arc extinguishing chamber, characterized in that: It includes an arc extinguishing chamber base (4). Inside the arc extinguishing chamber base (4), there is a protection component. Below the arc extinguishing chamber base (4), there is a left side plate (5) and a right side plate (6). Between the left side plate (5) and the right side plate (6), there is an arc extinguishing component as described in any one of claims 1-5. Below the arc extinguishing component, there are a left air blowing part (7) and a right air blowing part (8).

7. The DC arc extinguishing chamber according to claim 6, wherein: The protection component includes a bottom first flame extinguishing piece (9) and a bottom second flame extinguishing piece (10). The bottom first flame extinguishing piece (9) is arranged below the bottom second flame extinguishing piece (10). Between the bottom first flame extinguishing piece (9) and the bottom second flame extinguishing piece (10), there are a number of partition plates (11).

8. The DC arc extinguishing chamber according to claim 6, characterized in that: Between the arc extinguishing component and the bottom first flame extinguishing piece (9), there is a support component. The support component includes a front bracket (12) and a number of middle and rear brackets (13). The front bracket (12) is arranged between the integral arc extinguishing grid (1) and the bottom first flame extinguishing piece (9). The middle and rear brackets (13) are arranged between the arc extinguishing grid monomers (2-1) and the bottom first flame extinguishing piece (9).

9. The DC arc extinguishing chamber according to claim 8, characterized in that: Between the integral arc extinguishing grid (1) and the arc extinguishing grid monomers (2-1), and between adjacent two arc extinguishing grid monomers (2-1), there are fixed brackets (14).

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