Arc chamber and switchgear for preventing arc bounce-back

Abstract

The utility model relates to an arc chamber and switch equipment of preventing arc rebound, arc chamber includes casing, first insulating sheet, second insulating sheet, arc extinguishing grid sheet and insulating piece, first insulating piece includes first body part, first bending part, first hole on first body part, second insulating piece includes second body part, second bending part, second hole on second body part, second body part and first body part overlap up and down, make first bending part and second bending part face casing bottom and opposite and be located at both sides of casing, and first hole and second hole correspond, arc extinguishing grid sheet is located on second body part and is connected with casing, and insulating piece and arc extinguishing grid sheet upper part joint and with casing fixed, the utility model discloses through two insulating pieces transverse displacement when breaking, closes arc rebound channel, prevents arc rebound to arc chamber, thereby reduced arc rebound damage to arc chamber, also benefit arc smooth discharge switch equipment, improve arc extinguishing effect.

Description

Technical Field

[0001] This utility model relates to the field of DC circuit breaker technology, and in particular to an arc-extinguishing chamber and switching device for preventing arc rebound. Background Technology

[0002] In the field of DC circuit breakers, due to the large breaking current and increasingly higher breaking voltage, traditional arc-extinguishing chambers are insufficient to extinguish the arc generated during breaking. Currently, common technologies include:

[0003] (1) The arc-extinguishing chamber is installed at the front end of the mechanism. The arc-extinguishing chamber mainly uses the height space to arrange the grid plates for arc extinguishing. This structure can attract the arc into the arc-extinguishing chamber well. However, due to the limitation of height size, the number of arc-extinguishing grid plates is insufficient, which is not enough to support high voltage and large current interruption. However, the arc-extinguishing grid plates of this structure are basically aligned with the air outlet, and the arc can pass smoothly through the arc-extinguishing chamber and be discharged from the front air outlet. The probability of the arc being blocked and bounced back into the arc-extinguishing chamber is small.

[0004] (2) The arc-extinguishing chamber is installed at the lower end of the mechanism. The arc-extinguishing chamber mainly uses the long space to arrange the grid plates to extinguish the arc. This structure can greatly increase the number of arc-extinguishing grid plates, but the outlet is basically perpendicular to the grid plate arrangement direction, which can easily cause the arc to be discharged unsmoothly. As a result, the arc is blocked and bounced back into the arc-extinguishing chamber, causing the arc to repeatedly burn the grid plates of the arc-extinguishing chamber, reducing the arc-extinguishing effect of the arc-extinguishing chamber and reducing the life of the arc-extinguishing chamber.

[0005] Therefore, there is an urgent need for an arc-extinguishing chamber that can support high voltage and high current while preventing arc rebound. Utility Model Content

[0006] The purpose of this invention is to overcome the limitations of existing technologies in simultaneously supporting high voltage and high current while preventing arc rebound, thereby providing an arc-extinguishing chamber and switching device that prevents arc rebound.

[0007] The objective of this utility model can be achieved through the following technical solutions:

[0008] One of the technical solutions of this utility model is to provide an arc-extinguishing chamber to prevent arc rebound, comprising a shell, a first insulating sheet, a second insulating sheet, an arc-extinguishing grid sheet, and insulating components.

[0009] The first insulating member includes a first body portion, a first bent portion disposed at one end of the first body portion, and a plurality of first holes arranged in parallel on the first body portion.

[0010] The second insulating member includes a second body portion, a second bent portion disposed at one end of the second body portion, and a plurality of second holes arranged in parallel on the second body portion;

[0011] The second body part and the first body part are stacked vertically inside the housing, such that the first bent part and the second bent part face the bottom of the housing and are located opposite each other on both sides of the housing, and the first hole corresponds to the second hole;

[0012] Inside the housing, a plurality of arc-extinguishing grid plates are arranged side by side on the second body and snapped into the housing; the insulating member is snapped into the upper part of the arc-extinguishing grid plates and fixed to the housing.

[0013] When the electric arc passes through the first hole and the second hole, the first insulating component and the second insulating component are impacted by high-pressure gas, causing them to shift toward the first bending part and the second bending part, respectively, thus misaligning the first hole and the second hole and blocking the rebound of the electric arc.

[0014] In some specific embodiments, the two opposite inner sides of the housing are respectively provided with three parallel positioning strips, and a first positioning mounting groove for engaging the first body part and a second positioning mounting groove for engaging the second body part are respectively formed between two adjacent positioning strips.

[0015] The two opposite inner sides of the housing are respectively provided with a third positioning and mounting groove for engaging the arc-extinguishing grid plate.

[0016] The top of the housing opposite the two inner sides is provided with a first mounting hole for the fastener to pass through and fix the insulating element.

[0017] In some specific embodiments, the fastener includes screws and thermoplastic rivets.

[0018] In some specific embodiments, the arc-extinguishing grid is Y-shaped, including a V-shaped portion and a vertical portion. The outer side of the V-shaped portion is engaged with the third positioning and mounting groove, and the inner side of the V-shaped portion is engaged with the insulating component.

[0019] In some specific embodiments, the bottom of the insulating member is provided with a plurality of slits for engaging the inner side of the V-shaped portion.

[0020] In some specific embodiments, the top of the insulating member is provided with a second mounting hole corresponding to the first mounting hole; or, the top of the insulating member is provided with a heat-melting part for fixing to the housing; or, one side wall of the insulating member is provided with an adhesive layer that is bonded to the housing.

[0021] In some specific embodiments, the housing is an insulating gas-generating housing.

[0022] In some specific embodiments, the insulating element is an insulating gas-generating insulating element.

[0023] The second technical solution of this utility model is to provide a switching device, including a housing, a stationary contact, a moving contact disposed within the housing, and an arc-extinguishing chamber as described in one of the above technical solutions, wherein the housing is provided with a plurality of air outlets on the two side walls near the arc-extinguishing chamber.

[0024] In some specific embodiments, the arc-extinguishing grid plates are arranged in the same direction as the movement path of the stationary and moving contacts.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] This invention utilizes two overlapping insulating components with holes for the arc to pass through. Under normal use, these holes are aligned. However, during interruption, the insulating components are impacted by high-pressure gas, causing them to move laterally. This misaligns the holes on the two insulating components, which are then blocked by the opposing insulating components. The arc, after exiting the holes, impacts the bottom of the housing. Because the outlet of the switchgear is not aligned with the grid arrangement, the arc cannot exit smoothly from the outlet. The arc rebounds towards the arc-extinguishing chamber, but the blocked holes due to the lateral misalignment caused by gas pressure prevent the rebounding arc from entering the chamber. This effectively avoids repeated damage to the arc-extinguishing grid and forces the arc to exit only from the outlet, facilitating arc extinguishing and effectively improving the service life of the arc-extinguishing chamber and its arc-breaking capability. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the arc-extinguishing chamber of this utility model.

[0028] Figure 2 This is an exploded view of the arc-extinguishing chamber of this utility model.

[0029] Figure 3 This diagram illustrates how the shell and insulating components of the arc-extinguishing chamber of this invention are fixed with screws.

[0030] Figure 4 This diagram illustrates that the shell and insulating components of the arc-extinguishing chamber of this invention are fixed by hot-melt riveting.

[0031] Figure 5 This diagram illustrates how the shell and insulating components of the arc-extinguishing chamber of this invention are fixed together using adhesive.

[0032] Figure 6 The exploded view shows that the shell and insulating parts of the arc-extinguishing chamber of this utility model are fixed with screws.

[0033] Figure 7 This is a schematic diagram of the inner side structure of the shell of the arc-extinguishing chamber of this utility model.

[0034] Figure 8This is a top view of the shell of the arc-extinguishing chamber of this utility model.

[0035] Figure 9 This is a schematic diagram of the arc-extinguishing grid structure of the arc-extinguishing chamber of this utility model.

[0036] Figure 10 This is a schematic diagram of the insulating component structure of the arc-extinguishing chamber of this utility model.

[0037] Figure 11 This is a schematic diagram of the first insulating sheet structure of the arc-extinguishing chamber of this utility model.

[0038] Figure 12 This is a schematic diagram of the second insulating sheet structure of the arc-extinguishing chamber of this utility model.

[0039] Figure 13 This is a schematic diagram illustrating the arc generated when the moving and stationary contacts of the switching device of this utility model are disconnected.

[0040] Figure 14 This is a schematic diagram showing the arc generated by the breaking of the moving and stationary contacts of the switchgear of this utility model, which is discharged from the arc-extinguishing chamber and collides with the bottom of the housing.

[0041] The diagram is labeled as follows:

[0042] 1 is the shell, 11 is the bottom, 12 is the first positioning mounting groove, 13 is the second positioning mounting groove, 14 is the third positioning mounting groove, and 15 is the first mounting hole;

[0043] 2 is the first insulating sheet, 21 is the first bent part, 22 is the first hole, 23 is the first body part, and 211 is the displacement direction of the first insulating sheet;

[0044] 3 is the second insulating sheet, 31 is the second bent part, 32 is the second hole, 33 is the second body part, and 311 is the displacement direction of the second insulating sheet;

[0045] 4 is the arc-extinguishing grid plate, and 41 is the V-shaped section;

[0046] 5 is an insulating component, 51 is a slit, and 52 is a second mounting hole;

[0047] a is the hot melt riveting post, b is the adhesive layer, and 6 is the screw;

[0048] 7 is the stationary contact, 8 is the moving contact, 9 is the electric arc, 91 is the direction of the electric arc movement, 10 is the arc-extinguishing chamber, and A is the air outlet. Detailed Implementation

[0049] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. This embodiment is based on the technical solution of the present invention and provides detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following embodiments.

[0050] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0051] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0052] In the following embodiments, unless otherwise specified, the functional components or structures are conventional components or structures used in the art to achieve the corresponding functions.

[0053] Example 1

[0054] like Figures 1-2 As shown, an arc-extinguishing chamber 10 for preventing arc rebound includes a shell 1, a first insulating sheet 2, a second insulating sheet 3, an arc-extinguishing grid 4, and an insulating component 5.

[0055] like Figure 11 As shown, the first insulating member 2 includes a first body portion 23, a first bent portion 21 disposed at one end of the first body portion 23, and a plurality of first holes 22 arranged in parallel on the first body portion 23.

[0056] like Figure 12 As shown, the second insulating member 3 includes a second body portion 33, a second bent portion 31 provided at one end of the second body portion 33, and a plurality of second holes 32 arranged in parallel on the second body portion 33.

[0057] The second body part 33 is disposed vertically and vertically overlapping the first body part 23 inside the housing 1, such that the first bent part 21 and the second bent part 31 face the bottom of the housing 1 and are located opposite each other on both sides of the housing 1, and the first hole 22 corresponds to the second hole 32;

[0058] Inside the housing 1, a plurality of arc-extinguishing grid plates 4 are arranged side by side on the second body part 33 and are snapped into the housing 1. The insulating member 5 is snapped into the upper part of the arc-extinguishing grid plate 4 and fixed to the housing 1.

[0059] When the electric arc 9 passes through the first hole 22 and the second hole 32, the first insulating member 2 and the second insulating member 3 are impacted by high-pressure gas, causing them to shift toward the first bending part 21 and the second bending part 31 respectively, resulting in the first hole 22 and the second hole 32 being misaligned, thereby blocking the rebound of the electric arc.

[0060] In this technical solution, on the one hand, the first hole 22 and the second hole 32 on the first insulating sheet 2 and the second insulating sheet 3 respectively facilitate the smooth discharge of the electric arc 9 and improve the arc extinguishing effect; on the other hand, the movement of the first insulating sheet 2 and the second insulating sheet 3 due to the high-pressure gas causes the rebound channel of the electric arc 9 to be blocked, effectively preventing the electric arc 9 from rebounding into the arc extinguishing chamber 10 after being impacted, effectively reducing the damage of the electric arc 9 rebound to the arc extinguishing chamber 10, and improving the service life of the arc extinguishing grid sheet 4.

[0061] Based on this, such as Figure 7 and 8 As shown, the housing 1 is an upward-opening "U" shape, including a bottom 11 and side walls connected to its opposite sides. Three parallel positioning strips are provided on the inner surfaces of the opposite side walls. A first positioning mounting groove 12 for engaging the first body part 23 and a second positioning mounting groove 13 for engaging the second body part 33 are formed between adjacent two positioning strips, allowing the first insulating sheet 2 and the second insulating sheet 3 to move towards the first bending portion 21 and the second bending portion 31, respectively. The inner surfaces of the opposite side walls of the housing 1 are provided with third positioning mounting grooves 14 for engaging the arc-extinguishing grid sheet 4. The top of the inner surfaces of the opposite side walls of the housing 1 is provided with a first mounting hole 15 for a fastener to pass through and fix the insulating member 5. For example, the fastener can be a screw 6 or a thermoplastic rivet a.

[0062] Based on this, such as Figure 9 As shown, the arc-extinguishing grid plate 4 is Y-shaped, including a V-shaped part 41 and a vertical part. The outer side of the V-shaped part 41 is engaged with the third positioning mounting groove 14, and the inner side of the V-shaped part 41 is engaged with the insulating member 5.

[0063] Based on this, such as Figure 10 As shown, the bottom of the insulating member 5 is provided with a plurality of slits 51 for engaging the inner side of the V-shaped part 41.

[0064] The top of the insulating component 5 is provided with a second mounting hole 52 corresponding to the first mounting hole 15; or, the top of the insulating component 5 is provided with a heat-melting part for fixing to the housing 1; or, one side wall of the insulating component 5 is provided with an adhesive layer b that is bonded to the housing 1. Therefore, the connection method between the insulating component 5 and the housing 1 can be selected from the following three types:

[0065] (1) As Figure 3 , 6 As shown, a fastener such as a screw 6 passes through the second mounting hole 52 of the insulating component 5 and the first mounting hole 15 of the housing 1 in sequence for fixed connection;

[0066] (2) Figure 4As shown, a fastener such as a hot-melt rivet a passes through the second mounting hole 52 of the insulating component 5 and the first mounting hole 15 of the housing 1 in sequence. The hot-melt rivet a is heated and flattened to achieve a hot-melt fixed connection between the insulating component 5 and the housing 1.

[0067] (3) Figure 5 As shown, by providing an adhesive layer b on the outer side wall of the insulating component 5, the insulating component 5 and the housing 1 are bonded together by adhesive to achieve a fixed connection.

[0068] In this technical solution, both the housing 1 and the insulating component 5 are insulating gas-generating materials, which can accelerate the entry of the electric arc 9 into the arc-extinguishing chamber 10, thus facilitating arc extinguishing. That is, the housing 1 is an insulating gas-generating housing, and the insulating component 5 is an insulating gas-generating insulating component. For example, the insulating gas-generating material can be selected as flame-retardant reinforced nylon 66, flame-retardant reinforced nylon 46, flame-retardant reinforced nylon 6, or PPA (Polyphthalamide, high-temperature resistant nylon).

[0069] Example 2

[0070] like Figure 13 , 14 As shown, this embodiment provides a switching device, including a housing, a stationary contact 7, a moving contact 8 disposed within the housing, and an arc-extinguishing chamber 10 as described in Embodiment 1. The housing has several air outlets A on its two side walls near the arc-extinguishing chamber 10. The arc-extinguishing grid plates 4 are arranged in the same direction as the movement path of the stationary contact 7 and the moving contact 8.

[0071] When the stationary contact 7 and the moving contact 8 break apart, an electric arc 9 is generated. Affected by magnetic and air blowing, the arc 9 moves in the arc-extinguishing grid 4 of the arc-extinguishing chamber 10 in the direction 91 indicated by the arrow. After completely passing through the first hole 22 of the first insulating sheet 2 and the second hole 32 of the second insulating sheet 3, it impacts the bottom 11 of the housing 1. Because the air outlet A is located on the left and right sides of the arc-extinguishing chamber 10, which is not in the same direction as the arc 9, the arc 9 cannot be quickly discharged through the air outlet A. This causes the arc 9 to bounce back after impacting the bottom 11 of the housing 1. During this process, due to the high-pressure gas inside the arc-extinguishing chamber 10, the first bent portion 21 of the first insulating sheet 2 moves in the first insulating sheet displacement direction 211, and the second bent portion 31 of the second insulating sheet 3 moves in the second insulating sheet displacement direction 311. Figure 14 As shown, the first hole 21 of the first insulating sheet 2 is misaligned with the second hole 31 of the second insulating sheet 3. Therefore, the channel of the arc 9 toward the arc-extinguishing chamber 10 is blocked, preventing it from re-entering the arc-extinguishing chamber 10. This allows the arc 9 to be discharged through the outlet A, thus extinguishing the arc 10. This effectively prevents the arc 9 from rebounding and reigniting, repeatedly burning the arc-extinguishing grid sheet 4, affecting the service life of the arc-extinguishing grid sheet 4, reducing the difficulty of extinguishing the arc 9, and improving the arc-extinguishing capacity of the arc-extinguishing chamber 10.

[0072] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. An arc-extinguishing chamber for preventing arc rebound, characterized in that, It includes a housing (1), a first insulating sheet (2), a second insulating sheet (3), an arc-extinguishing grid sheet (4), and an insulating component (5). The first insulating sheet (2) includes a first body part (23), a first bent part (21) provided at one end of the first body part (23), and a plurality of first holes (22) arranged in parallel on the first body part (23). The second insulating sheet (3) includes a second body part (33), a second bent part (31) provided at one end of the second body part (33), and a plurality of second holes (32) arranged in parallel on the second body part (33). The second body part (33) and the first body part (23) are stacked vertically inside the housing (1), and the first bent part (21) and the second bent part (31) face the bottom of the housing (1) and are located opposite each other on both sides of the housing (1), and the first hole (22) corresponds to the second hole (32); Inside the housing (1), a plurality of arc-extinguishing grid plates (4) are arranged side by side on the second body part (33) and snapped into the housing (1). The insulating member (5) is snapped into the upper part of the arc-extinguishing grid plates (4) and fixed to the housing (1). When the electric arc (9) passes through the first hole (22) and the second hole (32), the first insulating sheet (2) and the second insulating sheet (3) are impacted by the high-pressure gas, causing them to shift toward the first bending part (21) and the second bending part (31) respectively, causing the first hole (22) and the second hole (32) to be misaligned, thereby blocking the rebound of the electric arc.

2. The arc-extinguishing chamber according to claim 1, characterized in that, The housing (1) has three parallel positioning strips on its two opposite inner sides. A first positioning mounting groove (12) for engaging the first body part (23) and a second positioning mounting groove (13) for engaging the second body part (33) are formed between two adjacent positioning strips. The housing (1) is provided with a third positioning and mounting groove (14) on each of the two opposite inner sides for engaging the arc-extinguishing grid plate (4). The housing (1) has a first mounting hole (15) on the top of its two inner sides for the fastener to pass through and fix the insulating member (5).

3. The arc-extinguishing chamber according to claim 2, characterized in that, The fasteners include screws (6) and hot-melt rivets (a).

4. The arc-extinguishing chamber according to claim 2, characterized in that, The arc-extinguishing grid plate (4) is Y-shaped, including a V-shaped part (41) and a vertical part. The outer side of the V-shaped part (41) is engaged with the third positioning mounting groove (14), and the inner side of the V-shaped part (41) is engaged with the insulating member (5).

5. The arc-extinguishing chamber according to claim 4, characterized in that, The bottom of the insulating member (5) is provided with a plurality of slits (51) for engaging the inner side of the V-shaped part (41).

6. The arc-extinguishing chamber according to claim 2, characterized in that, The top of the insulating member (5) is provided with a second mounting hole (52) corresponding to the first mounting hole (15), or the top of the insulating member (5) is provided with a heat-melting part for fixing to the housing (1), or a side wall of the insulating member (5) is provided with an adhesive layer (b) that is fixed to the housing (1).

7. The arc-extinguishing chamber according to claim 1, characterized in that, The shell (1) is an insulating gas-generating shell.

8. The arc-extinguishing chamber according to claim 1, characterized in that, The insulating component (5) is an insulating gas-generating insulating component.

9. A switching device, characterized in that, It includes a housing, a stationary contact (7) and a moving contact (8) disposed within the housing, and an arc-extinguishing chamber (10) as described in any one of claims 1-8. The housing is provided with a plurality of air outlets (A) on both side walls near the arc-extinguishing chamber (10).

10. The switching device according to claim 9, characterized in that, The arc-extinguishing grid (4) in the arc-extinguishing chamber (10) is arranged in the same direction as the movement path of the stationary contact (7) and the moving contact (8).

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