An arc-extinguishing chamber and switchgear for preventing arc rebound

Abstract

This utility model relates to an arc-extinguishing chamber and a switching device for preventing arc rebound. The arc-extinguishing chamber includes a housing, air outlets at both ends of the housing, an arc-extinguishing grid assembly disposed within the housing, and an insulating sleeve. The arc-extinguishing grid assembly includes a first arc-extinguishing grid group and a second arc-extinguishing grid group arranged side-by-side between the air outlets at both ends. Both the first and second arc-extinguishing grid groups include multiple arc-extinguishing grids arranged side-by-side. Each arc-extinguishing grid includes a U-shaped portion and a bent portion connected to the U-shaped portion. The insulating sleeve is arranged side-by-side at intervals and covers both ends of the U-shaped portion. The bent portions in the first and second arc-extinguishing grid groups are bent towards the air outlets on adjacent sides. Compared with the prior art, this utility model effectively prevents arc rebound by using bent arc-extinguishing grids, avoiding repeated damage to the arc-extinguishing grids. Simultaneously, the bending direction of the arc-extinguishing grids is biased towards the air outlets, forcing the arc to exit only from the air outlets, thus facilitating arc extinguishing.

Description

Technical Field

[0001] This utility model belongs to the field of circuit breaker technology, and relates 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, a common technique involves installing the arc-extinguishing chamber at the front end of the mechanism, where the chamber primarily uses vertically arranged grid plates for arc extinguishing. This structure effectively attracts the arc into the chamber, but due to height limitations, the number of grid plates is insufficient to support high-voltage, high-current breaking. However, in this structure, the grid plates are generally aligned with the exhaust port, allowing the arc to pass smoothly through the chamber and exit from the front exhaust port, minimizing the probability of the arc being obstructed and bounced back into the chamber. Another new structure involves installing the arc-extinguishing chamber at the lower end of the mechanism. The arc-extinguishing chamber mainly uses the length space to arrange the grid plates for arc extinguishing. This structure can significantly increase the number of arc-extinguishing grid plates, but the outlet is basically perpendicular to the direction of the grid plate arrangement, which can easily cause the arc to be discharged unsmoothly. This causes the arc to be blocked and bounced back into the arc-extinguishing chamber, resulting in the arc repeatedly burning 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. Utility Model Content

[0003] The purpose of this invention is to provide an arc-extinguishing chamber and switching device to prevent arc rebound. By using a bent arc-extinguishing grid, the arc rebound upon contact with the wall is effectively prevented, avoiding repeated damage to the arc-extinguishing grid. At the same time, the bending direction of the arc-extinguishing grid is biased towards the air outlet, so that the arc can only be discharged from the air outlet, which is conducive to extinguishing the arc.

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

[0005] The first aspect of this utility model provides an arc-extinguishing chamber for preventing arc rebound, comprising a shell, air outlets at both ends of the shell, an arc-extinguishing grid assembly disposed within the shell, and an insulating sleeve;

[0006] The arc-extinguishing grid assembly includes a first arc-extinguishing grid group and a second arc-extinguishing grid group arranged side by side between the two end air outlets;

[0007] Both the first arc-extinguishing grid group and the second arc-extinguishing grid group include multiple arc-extinguishing grids arranged in parallel;

[0008] The arc-extinguishing grid includes a U-shaped portion and a bent portion connected to the U-shaped portion;

[0009] The insulating sleeves are arranged side by side at intervals and cover both ends of the U-shaped part;

[0010] The bent portions in the first and second arc-extinguishing grid groups are bent toward the air outlets on adjacent sides, respectively.

[0011] In some specific embodiments, the bent portion is in the shape of a bent plate.

[0012] In some specific embodiments, the bending angle of the bent portion is greater than 90° and less than 180°; preferably, the bending angle is greater than 150° and less than 170°; more preferably, the bending angle is 160°.

[0013] In some specific embodiments, the housing includes a U-shaped groove, the air outlet is located at both ends of the U-shaped groove, and multiple arc-extinguishing grids are arranged along the length of the U-shaped groove.

[0014] In some specific embodiments, the inner walls on both sides of the U-shaped groove are provided with multiple vertical outward slots, and the two outer sides of the U-shaped part are provided with retaining plates, which are embedded in the vertical outward slots.

[0015] In some specific embodiments, the inner wall of the insulating sleeve is provided with a vertical inner groove, and the inner edge of the U-shaped part is embedded in the vertical inner groove.

[0016] In some specific embodiments, the insulating sleeve is screwed to the U-shaped groove.

[0017] In some specific embodiments, the insulating sleeve is bonded to the U-shaped groove.

[0018] In some specific embodiments, the insulating sleeve and the U-shaped groove are heat-fused and riveted together.

[0019] A second aspect of this invention provides a switching device, including an arc-extinguishing chamber as described above to prevent arc rebound.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] This invention features a bent section formed by bending the arc-extinguishing grid. The electric arc passes completely through the grid and collides with the housing. Due to the misalignment between the air outlet and the grid arrangement, the arc cannot be smoothly discharged from the air outlet. Instead, the arc rebounds towards the arc-extinguishing grid and is blocked by the bent section, preventing the rebounding arc from entering the arc-extinguishing chamber and avoiding repeated damage to the grid. Simultaneously, it forces the arc to be discharged only from the air outlet, which is beneficial for extinguishing the arc and effectively improves the service life of the arc-extinguishing chamber and its ability to break arcs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the arc-extinguishing chamber of this utility model;

[0023] Figure 2This is an exploded view of the arc-extinguishing chamber of this utility model;

[0024] Figure 3 This is a schematic diagram showing that the shell and insulating sleeve of the arc-extinguishing chamber of this utility model are fixed with screws.

[0025] Figure 4 This is a schematic diagram showing that the shell and insulating sleeve of the arc-extinguishing chamber of this utility model are fixed by hot-melt riveting.

[0026] Figure 5 This is a schematic diagram showing that the shell and insulating sleeve of the arc-extinguishing chamber of this utility model are fixed by adhesive bonding.

[0027] Figure 6 The exploded view shows that the shell and insulating sleeve of the arc-extinguishing chamber of this utility model are fixed by screws.

[0028] Figure 7 This is a schematic diagram of the housing of this utility model;

[0029] Figure 8 This is a schematic diagram of the arc-extinguishing grid plate of this utility model;

[0030] Figure 9 This is a schematic diagram of the insulating sleeve of this utility model;

[0031] Figure 10 This is a schematic diagram of the arc generated when the moving and stationary contacts of this utility model are disconnected.

[0032] Figure 11 A schematic diagram showing the collision of the bottom 11 of the housing after the arc is discharged from the bent part of the arc-extinguishing grid plate following the disconnection of the moving and stationary contacts in this utility model.

[0033] Explanation of markings in the diagram:

[0034] 1-Shell, 11-Vertical external groove, 2-Arc extinguishing grid, 21-Bent section, 22-U-shaped section, 3-Insulating sleeve, 31-Vertical internal groove, 4-Screw, 5-Stationary contact, 6-Moving contact, 7-Electric arc, 8-Gas outlet, 9-Arc extinguishing chamber. Detailed Implementation

[0035] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The following embodiments are based on the above-described technical solution of the present invention, providing detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0036] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., used to describe a common object only indicate different instances of the same object, and are not intended to imply that the objects described in this way must be in a given order, whether temporally, spatially, sequentially, or in any other way.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] 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.

[0039] 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.

[0040] Example 1:

[0041] like Figure 1 As shown, Figure 2 As shown, an arc-extinguishing chamber 9 of a switch is constructed from a housing 1, an arc-extinguishing grid 2, and an insulating component 3. Specifically, when the stationary contact 5 and the moving contact 6 are closed, an electric arc 7 is generated. Under the magnetic blowing force of the arc-extinguishing chamber 9, the electric arc 7 enters the arc-extinguishing grid 2. After completely passing through the bending portion 21 of the arc-extinguishing grid, the electric arc 7 impacts the bottom 11 of the housing 1. Since the air outlet 8 is located on the left and right sides of the arc-extinguishing chamber 9, which is not in the same direction as the movement of the electric arc 7, the electric arc 7 cannot be quickly discharged through the air outlet 8. This causes the electric arc 7 to bounce back to the bending portion 21 of the arc-extinguishing grid 2 after impacting the bottom 11 of the housing 1. Due to the obstruction of the bending portion 21, the electric arc 7 cannot smoothly return to the arc-extinguishing chamber 9, preventing the electric arc 7 from repeatedly burning the arc-extinguishing grid 2, thus affecting the service life of the arc-extinguishing grid 2. This effectively prevents the electric arc 7 from rebounding and reigniting, reduces the difficulty of extinguishing the electric arc 7, and improves the arc-extinguishing capability of the arc-extinguishing chamber 9.

[0042] The main function of this embodiment is to attract the electric arc generated when the moving and stationary contacts open and close into the grid of the arc-extinguishing chamber, cut the arc, and extinguish it. At the same time, the bent part of the grid can effectively prevent the rebound arc from re-entering the arc-extinguishing chamber, reduce the burning of the arc-extinguishing chamber, improve the service life of the arc-extinguishing chamber, reduce the difficulty of extinguishing the arc, improve the arc-extinguishing capacity of the arc-extinguishing chamber, and ensure the normal use and safety of the switch.

[0043] In some specific embodiments, both the housing 1 and the insulating component 3 are insulating gas-generating materials, such as flame-retardant reinforced nylon 66, flame-retardant reinforced nylon 46, flame-retardant reinforced nylon 6, PPA (Polyphthalamide, high-temperature resistant nylon), etc.

[0044] In some specific embodiments, multiple arc-extinguishing grid plates 2 are arranged in parallel, or they can be arranged radially in the direction of the movement path of the moving and stationary contacts.

[0045] Working principle:

[0046] like Figure 2 As shown, the arc-extinguishing chamber 9 includes a shell 1, arc-extinguishing grid plates 2, and insulating components 3, such as... Figure 7 As shown, the housing 1 includes a mounting and positioning groove 12 for the arc-extinguishing grid 2 and a positioning and mounting hole 13 for the insulating component 3, as shown. Figure 8 As shown, the grid plate 2 includes a mounting positioning feature 22 that matches the housing 1, a mounting positioning feature 23 that matches the insulating component 3, and a bending portion 21 that prevents arc rebound. The bending portion 21 of the grid plate forms an angle A with the grid plate. Angle A should be greater than 90° and less than 180°, and should be expressed as an obtuse angle. Preferably, the bending angle is greater than 150° and less than 170°; in this embodiment, 160° is used. Figure 9 As shown, the insulating component 3 includes a mounting and positioning groove 31 that matches the grid plate 2, and positioning and mounting holes 32 that match the housing 1 and screws 4. The grid plate 2 is inserted from above the housing 1, and the insulating component 3 is fixedly connected to the housing 1, which can be by thermoforming riveting, as shown in the figure. Figure 4 As shown, the housing 1 and the insulating part 3 are fixedly connected by hot-melt riveting part a, or by adhesive bonding, as detailed below. Figure 5 As shown, the housing 1 and the insulating part 3 are glued together at contact point b, or fixed with screws, as detailed below. Figure 3 As shown, the housing 1 and the insulating part 3 are fixed together by screws 4 through the positioning mounting holes 13 and 32 of the housing 1 and the positioning mounting holes 32 of the insulating part 3. The main method adopted by this utility model patent is screw fixing.

[0047] like Figure 10 As shown, the separation of stationary contact 5 and moving contact 6 generates an electric arc 7. The arc 7, influenced by magnetic and air blowing, enters the arc-extinguishing chamber and is ultimately discharged through the bent portion 21 of the arc-extinguishing grid 2. Figure 11 As shown, the electric arc 7 bounces back after reaching the bottom 11 of the casing 1, and is blocked by the bent part 21 of the grid plate 2, preventing it from re-entering the arc-extinguishing chamber 9, so that the electric arc 7 is finally discharged through the air outlet 8. This extinguishes the electric arc 7.

[0048] Example 2:

[0049] An arc-extinguishing chamber for preventing arc rebound includes a housing 1, air outlets 8 at both ends of the housing 1, an arc-extinguishing grid assembly disposed within the housing 1, and an insulating sleeve 3; wherein the arc-extinguishing grid assembly includes a first arc-extinguishing grid group and a second arc-extinguishing grid group arranged side by side between the air outlets 8 at both ends; both the first and second arc-extinguishing grid groups include multiple arc-extinguishing grids 2 arranged side by side; each arc-extinguishing grid 2 includes a U-shaped portion 22 and a bent portion 21 connected to the U-shaped portion 22; the insulating sleeve 3 is arranged side by side at intervals and covers both ends of the U-shaped portion 22; the bent portions 21 in the first and second arc-extinguishing grid groups are bent toward the air outlets 8 on the adjacent sides respectively.

[0050] Specifically, the bending portion 21 is in the shape of a bent plate, and the bending angle of the bending portion 21 is greater than 90° and less than 180°. Preferably, the bending angle is greater than 150° and less than 170°; in this embodiment, 160° is used.

[0051] The housing 1 includes a U-shaped groove, with air outlets 8 located at both ends of the U-shaped groove, and multiple arc-extinguishing grid plates 2 arranged along the length of the U-shaped groove. Multiple vertically extending grooves 11 are formed on the inner walls of both sides of the U-shaped groove, and retaining plates are provided on the outer sides of the U-shaped portion 22, with the retaining plates embedded in the vertically extending grooves 11. A vertically extending groove 31 is formed on the inner wall of the insulating sleeve 3, and the inner edge of the U-shaped portion 22 is embedded in the vertically extending groove 31. The insulating sleeve 3 and the U-shaped groove are connected by screws, adhesive, or thermoforming riveting.

[0052] 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 flashback prevention arc chute, characterized by, It includes a housing (1), air outlets (8) at both ends of the housing (1), an arc-extinguishing grid assembly inside the housing (1), and an insulating sleeve (3). The arc-extinguishing grid assembly includes a first arc-extinguishing grid group and a second arc-extinguishing grid group arranged side by side between the two end air outlets (8); Both the first arc-extinguishing grid group and the second arc-extinguishing grid group include multiple arc-extinguishing grids (2) arranged in parallel. The arc-extinguishing grid (2) includes a U-shaped part (22) and a bent part (21) connected to the U-shaped part (22). The insulating sleeves (3) are arranged side by side at intervals and cover both ends of the U-shaped part (22); The bent portions (21) in the first and second arc-extinguishing grid groups are bent toward the air outlets (8) on the adjacent sides, respectively.

2. The arc-back-preventing arc chute according to claim 1, characterized in that The bent portion (21) is in the shape of a bent plate.

3. The arc-back-preventing arc chute according to claim 1, characterized in that The bending angle of the bent portion (21) is greater than 90° and less than 180°.

4. The arc-back-preventing arc chute according to claim 3, characterized in that The bending angle is greater than 150° and less than 170°.

5. The arc-back-preventing arc chute according to claim 3, characterized in that The bending angle is 160°.

6. The arc-back-preventing arc chute according to claim 1, characterized in that The housing (1) includes a U-shaped groove, the air outlet (8) is located at both ends of the U-shaped groove, and multiple arc-extinguishing grid plates (2) are arranged along the length of the U-shaped groove.

7. The arc-back-preventing arc chute according to claim 6, characterized in that The inner walls of the two sides of the U-shaped groove are provided with multiple vertical outer grooves (11), and the two outer sides of the U-shaped part (22) are provided with a card plate, which is embedded in the vertical outer groove (11).

8. The arc-back-preventing arc chute according to claim 7, characterized in that The inner wall of the insulating sleeve (3) is provided with a vertical inner groove (31), and the inner edge of the U-shaped part (22) is embedded in the vertical inner groove (31).

9. The arc-back-preventing arc chute according to claim 6, characterized in that The insulating sleeve (3) is screwed to the U-shaped groove.

10. The arc-back-preventing arc chute according to claim 6, characterized in that The insulating sleeve (3) is bonded to the U-shaped groove.

11. The arc-back-preventing arc chute according to claim 1, characterized in that The insulating sleeve (3) is hot-melt riveted to the U-shaped groove.

12. A switching device, characterized by Includes an arc-extinguishing chamber (9) for preventing arc rebound as described in any one of claims 1 to 11.

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