Special backup protection device for low-voltage surge protection device

Abstract

The utility model discloses a special backup protection device for a low-voltage surge protection device, which comprises a static contact, a moving contact and an arc extinguishing mechanism, the arc extinguishing mechanism comprises an insulating shell and an arc extinguishing grid plate group assembled in the insulating shell, the arc extinguishing grid plate group comprises a plurality of arc extinguishing grid plates which are arranged at intervals, and the arc extinguishing grid plates are arranged in the insulating shell. The arc extinguishing grid sheet group is provided with a linear part and a fan-shaped part, the linear part is arranged towards the static contact and the moving contact, and the fan-shaped part is connected to the linear part; in the linear part, the plurality of arc extinguishing grid sheets are parallel to each other and are arranged at equal intervals, and the interval between two adjacent arc extinguishing grid sheets is D1; in the fan-shaped part, the plurality of arc extinguishing grid sheets bend and extend in a fan shape, and the distance between two adjacent arc extinguishing grid sheets is gradually increased from D1 to D2. According to the utility model, the arc extinguishing effect of the special backup protection device can be improved in a limited space, and the safety performance of the device is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric power lightning protection, specifically relates to a special backup protection device of low voltage surge protector. BACKGROUND

[0002] With the vigorous development of power electronics, industrial power grids are spread in various environments, in order to effectively prevent the influence of space lightning flash field on power grid, power and electronic equipment, people have invented many lightning surge protectors. According to the current standard, the front end of the surge protector must be connected with a special backup protection device, which is used to cut off the circuit for protection when the surge protector refuses to act.

[0003] The special backup protection device of surge protector mainly includes a shell, an operating mechanism, a contact mechanism, an arc extinguishing chamber and a gas discharge tube. The process of connecting and breaking current of the contact mechanism is often accompanied by the generation of electric arc, and if the duration of electric arc is relatively long, it will cause damage to the surrounding devices. The existing special backup protection device is usually provided with a plurality of arc extinguishing grid fins arranged at equal intervals in the arc extinguishing chamber, such as the scheme disclosed in patent CN215834438U. Due to the limited internal space of the special backup protection device, the arc extinguishing chamber is short, which leads to poor arc extinguishing effect. SUMMARY

[0004] Therefore, the utility model embodiment provides a special backup protection device of low voltage surge protector to solve the problem of how to improve the arc extinguishing effect of the special backup protection device in limited space.

[0005] In order to achieve the above purpose, the utility model provides the following technical scheme:

[0006] A special backup protection device of low voltage surge protector, comprising a static contact, a moving contact and an arc extinguishing mechanism, the arc extinguishing mechanism comprises an arc extinguishing grid fin group assembled in an insulating shell, the arc extinguishing grid fin group comprises a plurality of arc extinguishing grid fins arranged at equal intervals, the arc extinguishing grid fin group is formed with a straight line part and a fan-shaped part, the straight line part is arranged towards the static contact and the moving contact, and the fan-shaped part is connected to the straight line part; in the straight line part, a plurality of arc extinguishing grid fins are arranged at equal intervals and parallel to each other, and the interval between adjacent two arc extinguishing grid fins is D1; in the fan-shaped part, a plurality of arc extinguishing grid fins extend in a fan-shaped curve, and the interval between adjacent two arc extinguishing grid fins gradually increases from D1 to D2; wherein the size of D2 is 2-2.5 times of D1.

[0007] Further, the arc-extinguishing grid group is arranged between the lower insulating plate and the upper insulating plate.

[0008] Further, the arc-extinguishing grid group is arranged between the lower insulating plate and the upper insulating plate.

[0009] Further, the arc-extinguishing grid group is arranged between the lower insulating plate and the upper insulating plate.

[0010] Further, the arc-extinguishing grid group is arranged between the lower insulating plate and the upper insulating plate.

[0011] The arc-extinguishing mechanism in the special backup protection device of the low-voltage surge protector provided by the embodiment of the utility model is composed of the arc-extinguishing grid group arranged at intervals, the arc-extinguishing grid group is formed with a straight line part and a fan-shaped part, in the straight line part, the arc-extinguishing grids are arranged in parallel and at equal intervals, the adjacent two arc-extinguishing grids have a small interval, the arc can be well divided, and the effect of cutting off the arc is achieved; after the arc is divided, the interval between the adjacent two arc-extinguishing grids gradually increases in the fan-shaped part, the arc can be consumed in energy, the effect of extinguishing the arc is achieved, finally, the interval between the adjacent two arc-extinguishing grids at the tail of the arc-extinguishing grid is the largest, the high heat generated in the arc-extinguishing process can be better dissipated, so that the arc-extinguishing process is stable and safe. Based on the above arc-extinguishing process, the arc-extinguishing effect of the special backup protection device can be improved in the limited space, and the safety performance of the device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a structure schematic view of the special backup protection device in the utility model;

[0013] Figure 2 It is a structure view of the mutual connection between the arc-extinguishing mechanism and the arc flow member in the utility model;

[0014] Figure 3 It is a top view of the arc-extinguishing mechanism in the utility model;

[0015] Figure 4 It is a side view of the arc-extinguishing mechanism in the utility model;

[0016] Figure 5 It is a structure schematic view of the arc-extinguishing grid group in the utility model. DETAILED DESCRIPTION

[0017] The following describes the embodiments of the present application by specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0018] Although the present application has been described in detail by general description and specific examples above, some modifications or improvements can be made on the basis of the present application, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the present application are within the scope of protection of the present application.

[0019] The terms such as "upper", "lower", "left", "right", "middle" and the like in the present specification are only for the convenience of clear description, and are not used to limit the scope of the present application. The change or adjustment of the relative relationship without substantial change of the technical content is also considered as the scope of the present application.

[0020] The embodiment of the present application provides a special backup protection device for low-voltage surge protector, as shown in Figures 1 to 5 , the special backup protection device comprises a static contact 1, a moving contact 2 and an arc extinguishing mechanism 3. Among them, the arc extinguishing mechanism 3 comprises an insulating shell 31 and an arc extinguishing grid piece group 32 assembled in the insulating shell 31, the arc extinguishing grid piece group 32 comprises a plurality of arc extinguishing grid pieces 32a arranged at intervals, the arc extinguishing grid piece group 32 is formed with a straight part 321 and a fan-shaped part 322, the straight part 321 is arranged towards the static contact 1 and the moving contact 2, and the fan-shaped part 322 is connected to the straight part 321.

[0021] Among them, in the straight part 321, a plurality of arc extinguishing grid pieces 32a are arranged in parallel and at equal intervals, and the interval between two adjacent arc extinguishing grid pieces 32a is D1. In the fan-shaped part 322, a plurality of arc extinguishing grid pieces 32a extend in a fan-shaped curve, and the interval between two adjacent arc extinguishing grid pieces 32a gradually increases from D1 to D2. As a preferred scheme, the size of D2 is 2-2.5 times of D1.

[0022] It should be noted that the special backup protection device also includes a shell, an operating mechanism, a contact connecting mechanism and a gas discharge tube, etc. This part of structure can refer to the existing technology, so it will not be described in detail in this embodiment.

[0023] In this embodiment, as Figure 3And Figure 4 As shown in the figure, the insulating shell 31 includes a lower insulating plate 311 and an upper insulating plate 312, and the arc extinguishing grid group 32 is clamped between the lower insulating plate 311 and the upper insulating plate 312. Further, the end of the arc extinguishing grid 32a towards the static contact 1 and the moving contact 2 is provided with a V-shaped notch, and by providing the V-shaped notch, the arc can be better introduced into the arc extinguishing grid group 32 for division and interruption.

[0024] In this embodiment, as shown in the figure, Figure 5 In the arc extinguishing grid group 32, the leftmost arc extinguishing grid 32a extends to the left side of the insulating shell 31 in the sector 322, the rightmost arc extinguishing grid 32a extends to the right side of the insulating shell 31 in the sector 322, and the remaining arc extinguishing grids 32a extend to the back side of the insulating shell 31 in the sector 322.

[0025] In this embodiment, as shown in the figure, Figure 1 And Figure 2 As shown in the figure, the special backup protection device further includes an arc flow guide 4, the first end of the arc flow guide 4 extends to the side of the static contact 1 and the moving contact 2, and the arc extinguishing mechanism 3 is connected to the second end of the arc flow guide 4. By providing the arc flow guide 4, the arc generated between the static contact 1 and the moving contact 2 can be guided to the arc extinguishing mechanism 3, improving the arc extinguishing effect.

[0026] The special backup protection device of the low-voltage surge protector provided in the above embodiment, wherein the arc extinguishing mechanism is composed of a plurality of arc extinguishing grids arranged at intervals, the arc extinguishing grid group forms a straight line part and a sector part, in the straight line part, a plurality of arc extinguishing grids are arranged in parallel and at equal intervals, and adjacent two arc extinguishing grids have a smaller interval, which can well divide the arc and play a role in interrupting the arc; after the arc is divided, it enters the sector part with gradually increasing interval between adjacent two arc extinguishing grids, which can consume the energy of the arc and play a role in extinguishing the arc, and finally at the tail of the arc extinguishing grid, the interval between adjacent two arc extinguishing grids is the largest, which can better dissipate the high heat generated in the arc extinguishing process, thereby making the arc extinguishing process stable and safe. Based on the above arc extinguishing process, the scheme can improve the arc extinguishing effect of the special backup protection device in a limited space and improve the safety performance of the device.

[0027] The above is only a specific embodiment of the present application, and it should be noted that for ordinary skilled persons in the technical field, without departing from the principle of the present application, a number of improvements and refinements can be made, which should also be considered as the protection range of the present application.

Claims

1. A special backup protection device for low voltage surge protectors, comprising a fixed contact (1), a movable contact (2) and an arc extinguishing mechanism (3), characterized in that, The arc extinguishing mechanism (3) comprises an insulating shell (31) and an arc extinguishing grid group (32) assembled in the insulating shell (31), the arc extinguishing grid group (32) comprises a plurality of arc extinguishing grids (32a) arranged at intervals, and the arc extinguishing grid group (32) is formed with a straight part (321) and a fan-shaped part (322), the straight part (321) is arranged towards the static contact (1) and the moving contact (2), and the fan-shaped part (322) is connected to the straight part (321). In the straight part (321), a plurality of arc extinguishing grids (32a) are arranged in parallel and at equal intervals, and the interval between two adjacent arc extinguishing grids (32a) is D1. In the fan-shaped part (322), a plurality of arc extinguishing grids (32a) extend in a fan-shaped curve, and the interval between two adjacent arc extinguishing grids (32a) gradually increases from D1 to D2. Wherein, the size of D2 is 2-2.5 times of D1.

2. The dedicated back-up protection device according to claim 1, characterized in that, In the arc extinguishing grid group (32), the leftmost arc extinguishing grid (32a) extends to the left side of the insulating shell (31) in the fan-shaped part (322), the rightmost arc extinguishing grid (32a) extends to the right side of the insulating shell (31) in the fan-shaped part (322), and the remaining arc extinguishing grids (32a) extend to the back side of the insulating shell (31) in the fan-shaped part (322).

3. The dedicated back-up protection device of claim 1, wherein, The insulating shell (31) comprises a lower insulating plate (311) and an upper insulating plate (312), and the arc extinguishing grid group (32) is clamped between the lower insulating plate (311) and the upper insulating plate (312).

4. The dedicated back-up protection device of claim 1, wherein, The end of the arc extinguishing grid (32a) towards the static contact (1) and the moving contact (2) is provided with a V-shaped notch.

5. The dedicated back-up protection device according to any of claims 1-4, characterized in that, The special backup protection device further comprises an arc flow member (4), a first end of the arc flow member (4) extends to the side of the static contact (1) and the moving contact (2), and the arc extinguishing mechanism (3) is connected to the second end of the arc flow member (4).

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