Arc extinguish chamber and circuit breaker

Abstract

The utility model belongs to the technical field of low-voltage electric appliances, and discloses an arc extinguish chamber and a circuit breaker. The arc extinguish chamber comprises a first unit and a second unit, the first unit comprises two cheek plates, the two cheek plates are oppositely arranged, and a containing space is defined between the two cheek plates; the second unit comprises a first arc striking and extinguishing sheet, a plurality of arc extinguishing grid sheets and a second arc striking and extinguishing sheet which are sequentially stacked in the third direction, and the first arc striking and extinguishing sheet, the second arc striking and extinguishing sheet and the plurality of arc extinguishing grid sheets are all arranged in the accommodating space and extend in the first direction; the plurality of arc extinguishing grid sheets are located between the first arc striking and extinguishing sheet and the second arc striking and extinguishing sheet, and the extending lengths of the first arc striking and extinguishing sheet and the second arc striking and extinguishing sheet along the first direction are greater than the extending lengths of the arc extinguishing grid sheets along the first direction. According to the utility model, the arc transfer speed is accelerated, and the arcing time is shortened.

Description

TECHNICAL FIELD

[0001] The utility model relates to low voltage electrical apparatus technical field especially relates to arc extinguishing chamber and circuit breaker. BACKGROUND

[0002] Small circuit breaker is an important component in low voltage distribution system, and plays a role of overload and short circuit protection and infrequent operation conversion of line in normal condition in distribution system. The arc extinguishing system of small circuit breaker includes moving and static contact, arc guide plate, arc extinguishing device and other parts. When short circuit current appears, the moving and static contact of circuit breaker is separated to produce arc, then the arc is transferred to arc guide plate, and finally introduced between arc extinguishing grid, the arc is divided into small short arc and gradually extinguished.

[0003] The prior art circuit breaker, in the process of arc from contact to arc extinguishing chamber through arc guide plate, not only exists the situation that arc transfer speed is slow or even arc stagnation, arc burning time is long, breaking process energy is large, destroys the insulation system of power grid and burns the electric appliance in use, but also may cause fire and large area power failure accident, brings personal safety and huge economic loss to enterprise and individual. SUMMARY

[0004] The utility model discloses a kind of arc extinguishing chamber and circuit breaker, accelerate the transfer speed of arc, shorten arc burning time.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] Arc extinguishing chamber, comprising:

[0007] First unit, including two cheek plates, two The cheek plate is oppositely arranged, and the connecting plate and the two cheek plates form a containing space.

[0008] Second unit, including first arc guide arc extinguishing sheet, a plurality of arc extinguishing grid sheets and second arc guide arc extinguishing sheet sequentially stacked along third direction, the first arc guide arc extinguishing sheet, the second arc guide arc extinguishing sheet and a plurality of the arc extinguishing grid sheet are all arranged in the containing space and extend along the first direction, a plurality of the arc extinguishing grid sheet is located between the first arc guide arc extinguishing sheet and the second arc guide arc extinguishing sheet, the length of the first arc guide arc extinguishing sheet and the second arc guide arc extinguishing sheet extending along the first direction is greater than the length of the arc extinguishing grid sheet extending along the first direction, and the first direction and the third direction are perpendicular to each other.

[0009] As an optional scheme of arc extinguishing chamber, the part of the first arc guide arc extinguishing sheet that extends out of the containing space is provided with a first widened plate part extending along the second direction; and / or

[0010] The part of the second arc striking and extinguishing piece extending out of the accommodating space is provided with a second widened plate part extending in a second direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0011] As an optional solution of the arc extinguishing chamber, the first arc striking and extinguishing piece, the second arc striking and extinguishing piece and the plurality of arc extinguishing grid pieces are all detachably linked with the two cheek plates.

[0012] As an optional solution of the arc extinguishing chamber, the cheek plate is provided with a first clamping hole, and the two sides of the first arc striking and extinguishing piece are provided with first clamping protrusions which are inserted into the first clamping hole; and / or

[0013] The cheek plate is provided with a second clamping hole, and the two sides of the second arc striking and extinguishing piece are provided with second clamping protrusions which are inserted into the second clamping hole.

[0014] As an optional solution of the arc extinguishing chamber, the cheek plate is provided with a plurality of third clamping holes which are arranged at intervals in a third direction, and the two sides of the arc extinguishing grid piece are provided with third clamping protrusions which are inserted into the third clamping holes.

[0015] As an optional solution of the arc extinguishing chamber, a connecting plate is further included, and the two cheek plates are respectively arranged at the two ends of the connecting plate, and an accommodating groove is formed between the connecting plate and the two cheek plates, and a plurality of air permeable holes are arranged on the connecting plate.

[0016] A circuit breaker includes a housing and the arc extinguishing chamber according to any one of the above solutions, and the arc extinguishing chamber is arranged in the housing.

[0017] As an optional solution of the circuit breaker, the circuit breaker further includes a first arc striking plate, a second arc striking plate, a static contact and a movable contact, the first arc striking plate and the second arc striking plate are arranged in the housing, the static contact is arranged on the first arc striking plate, the movable contact is rotationally arranged in the housing and can be attracted to or disconnected from the static contact, one end of the first arc striking plate close to the first arc striking and extinguishing piece abuts against the first arc striking and extinguishing piece, and one end of the second arc striking plate close to the second arc striking and extinguishing piece abuts against the second arc striking and extinguishing piece.

[0018] As an optional solution of the circuit breaker, one end of the first arc striking plate close to the first arc striking and extinguishing piece is provided with a first curved part which abuts against the first arc striking and extinguishing piece; and / or

[0019] One end of the second arc striking plate close to the second arc striking and extinguishing piece is provided with a second curved part which abuts against the second arc striking and extinguishing piece.

[0020] As an optional solution of the circuit breaker, the second arc striking plate is provided with an opening.

[0021] Compared with the prior art, the utility model has the beneficial effects of:

[0022] The arc extinguishing chamber is provided with the first arc leading arc extinguishing piece, the second arc leading arc extinguishing piece and the plurality of arc extinguishing grid pieces, the length of the first arc leading arc extinguishing piece and the second arc leading arc extinguishing piece extending along the first direction is greater than the length of the arc extinguishing grid piece extending along the first direction, the first arc leading arc extinguishing piece and the second arc leading arc extinguishing piece utilize the length advantage to facilitate the arc leading into the arc extinguishing chamber, air as a medium is avoided, the residence time of the arc in the contact area is reduced, and thus the burning loss of the arc to the stationary contact and the movable contact is reduced. Meanwhile, after the arc enters the arc extinguishing chamber, the first arc leading arc extinguishing piece and the second arc leading arc extinguishing piece can also play a role as the grid piece of the arc extinguishing chamber, and the arc is divided and extinguished. In the breaking process, the first arc leading arc extinguishing piece and the second arc leading arc extinguishing piece play the role of the magnetic yoke arc leading in the early stage and play the role of the arc extinguishing grid arc extinguishing in the later stage, the transfer speed of the arc is accelerated, and the arc burning time is shortened.

[0023] The circuit breaker is provided with the arc extinguishing chamber in the shell, in the breaking process, the first arc leading arc extinguishing piece and the second arc leading arc extinguishing piece in the arc extinguishing chamber play the role of the magnetic yoke arc leading in the early stage and play the role of the arc extinguishing grid arc extinguishing in the later stage, the transfer speed of the arc in the circuit breaker is accelerated, and the arc burning time is shortened. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is the assembly schematic view of the arc extinguishing chamber in the utility model embodiment;

[0025] Figure 2 is the explosion schematic view of the arc extinguishing chamber in the utility model embodiment;

[0026] Figure 3 is the assembly schematic view of the circuit breaker in the utility model embodiment;

[0027] Figure 4 is the explosion schematic view of the circuit breaker in the utility model embodiment (the shell is not shown);

[0028] Figure 5 is the structural schematic view of the first arc leading plate in the utility model embodiment;

[0029] Figure 6 is the structural schematic view of the second arc leading plate in the utility model embodiment.

[0030] In the drawing:

[0031] 100, arc extinguishing chamber; 200, shell; 300, first arc leading plate; 301, first bending part; 400, second arc leading plate; 401, second bending part; 402, opening; 500, stationary contact; 600, movable contact;

[0032] 1, first unit; 2, second unit;

[0033] 11, connecting plate; 111, air hole; 12, cheek plate; 121, first clamping hole; 122, second clamping hole; 123, third clamping hole; 13, accommodating space;

[0034] 21, first arc striking and extinguishing piece; 211, first widened plate part; 212, first clamping convex; 22, second arc striking and extinguishing piece; 221, second widened plate part; 222, second clamping convex; 23, arc extinguishing grid piece; 231, third clamping convex. DETAILED DESCRIPTION

[0035] The utility model will be described in further detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and not to limit the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0036] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0037] In the utility model, unless otherwise explicitly specified and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0038] In the description of the present embodiment, the terms "upper", "lower", "right", and the like orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used to distinguish in the description, and have no special meaning.

[0039] In order to accelerate the transfer speed of the arc and shorten the arc burning time, the present embodiment provides an arc extinguishing chamber and a circuit breaker, which will be described below in combination with Figures 1 to 6 The specific content of the present embodiment will be described in detail. It should be noted that the first direction mentioned in the present embodiment is the X direction in Figure 1 The second direction mentioned in the present embodiment is the Y direction in Figure 1 The third direction mentioned in the present embodiment is the Z direction in Figure 1 .

[0040] As shown in Figure 1 In combination with Figure 2 The arc extinguishing chamber 100 in the present embodiment includes a first unit 1 and a second unit 2. The first unit 1 includes two cheek plates 12, which are oppositely arranged, and a containing space 13 is formed between the two cheek plates 12. The second unit 2 includes a first arc striking arc extinguishing sheet 21, a plurality of arc extinguishing grid sheets 23 and a second arc striking arc extinguishing sheet 22 which are sequentially stacked along the third direction, the first arc striking arc extinguishing sheet 21, the second arc striking arc extinguishing sheet 22 and the plurality of arc extinguishing grid sheets 23 are all arranged in the containing space 13 and extend along the first direction, the plurality of arc extinguishing grid sheets 23 are located between the first arc striking arc extinguishing sheet 21 and the second arc striking arc extinguishing sheet 22, the length of the first arc striking arc extinguishing sheet 21 and the second arc striking arc extinguishing sheet 22 extending along the first direction is greater than the length of the arc extinguishing grid sheet 23 extending along the first direction, and the first direction and the third direction are perpendicular to each other.

[0041] Briefly, the arc-extinguishing chamber 100 provided by the embodiment installs the first arc-ignition arc-extinguishing piece 21 and the second arc-ignition arc-extinguishing piece 22 into the accommodating space 13 formed by the connecting plate 11 and the two cheek plates 12, and the lengths of the first arc-ignition arc-extinguishing piece 21 and the second arc-ignition arc-extinguishing piece 22 extending in the first direction are both greater than the length of the arc-extinguishing grid piece 23 extending in the first direction. The first arc-ignition arc-extinguishing piece 21 and the second arc-ignition arc-extinguishing piece 22 facilitate the rapid introduction of the arc into the arc-extinguishing chamber 100 by virtue of the length advantage, avoid the use of air as a medium, reduce the residence time of the arc in the contact area, and thus reduce the burning of the arc on the stationary contact 500 and the movable contact 600. Meanwhile, after the arc enters the arc-extinguishing chamber 100, the first arc-ignition arc-extinguishing piece 21 and the second arc-ignition arc-extinguishing piece 22 can also function as the grid pieces of the arc-extinguishing chamber 100, and the arc is divided and extinguished. In the breaking process, the first arc-ignition arc-extinguishing piece 21 and the second arc-ignition arc-extinguishing piece 22 function as the magnetic yoke arc-ignition piece in the early stage and function as the arc-extinguishing grid piece in the later stage, thereby accelerating the transfer speed of the arc and shortening the arc burning time.

[0042] Further, the part of the first arc-ignition arc-extinguishing piece 21 extending out of the accommodating space 13 is provided with a first widened plate portion 211 extending in the second direction; and / or the part of the second arc-ignition arc-extinguishing piece 22 extending out of the accommodating space 13 is provided with a second widened plate portion 221 extending in the second direction, and the first direction, the second direction and the third direction are perpendicular to each other. By additionally providing the first widened plate portion 211 and the second widened plate portion 221, when the arc is transferred to this place during the short-circuit test, the first widened plate portion 211 and the second widened plate portion 221 with a larger area in the up-down direction act as a barrier, the two cheek plates 12 of the first unit 1 act as a barrier in the left-right direction, and the air pressure in the contact area is high, so that the arc is rapidly transferred to the arc-extinguishing chamber 100 under the action of the air pressure, and the air-blowing arc-ignition effect is better.

[0043] Further, the first arc-ignition arc-extinguishing piece 21, the second arc-ignition arc-extinguishing piece 22 and the plurality of arc-extinguishing grid pieces 23 are all detachably linked with the two cheek plates 12. The first arc-ignition arc-extinguishing piece 21, the second arc-ignition arc-extinguishing piece 22 and the plurality of arc-extinguishing grid pieces 23 are installed in a detachable manner, which facilitates timely replacement and maintenance in the later stage.

[0044] Further, the cheek plate 12 is provided with a first clamping hole 121, and the two sides of the first arc-ignition arc-extinguishing piece 21 are both provided with a first clamping protrusion 212, which is inserted into the first clamping hole 121; and / or the cheek plate 12 is provided with a second clamping hole 122, and the two sides of the second arc-ignition arc-extinguishing piece 22 are both provided with a second clamping protrusion 222, which is inserted into the second clamping hole 122. The insertion of the first clamping protrusion 212 into the first clamping hole 121 and the insertion of the second clamping protrusion 222 into the second clamping hole 122 help to ensure the stability of the installation of the first arc-ignition arc-extinguishing piece 21 and the second arc-ignition arc-extinguishing piece 22 on the cheek plate 12.

[0045] Further, the cheek plate 12 is provided with a plurality of third clamping holes 123 arranged at intervals along a third direction, and the two sides of the arc extinguishing fin 23 are provided with third clamping protrusions 231 which are inserted into the third clamping holes 123. The third clamping protrusions 231 and the third clamping holes 123 are inserted into each other, thereby ensuring the firmness of the installation of the arc extinguishing fin 23 and the cheek plate 12.

[0046] Further, the first unit 1 further comprises a connecting plate 11, and the two cheek plates 12 are respectively arranged at the two ends of the connecting plate 11. The connecting plate 11 and the two cheek plates 12 are arranged to form a containing groove therebetween, and the connecting plate 11 is provided with a plurality of air holes 111. During the short-circuit test, the air pressure in the contact area is high, so that the electric arc is quickly transferred to the arc extinguishing chamber 100 under the action of the air pressure. The plurality of air holes 111 provided on the connecting plate 11 facilitate the discharge of the gas in the arc extinguishing chamber 100 from the containing groove.

[0047] As shown in Figure 3 and Figure 4 , the present embodiment further provides a circuit breaker, which comprises a shell 200 and the above-mentioned arc extinguishing chamber 100. The arc extinguishing chamber 100 is arranged in the shell 200. The first arc striking arc extinguishing fin 21 and the second arc striking arc extinguishing fin 22 in the arc extinguishing chamber 100 play the role of magnetic yoke striking in the early stage and the role of arc extinguishing grid in the later stage during the breaking process, thereby accelerating the transfer speed of the electric arc in the circuit breaker and shortening the arc time. Exemplarily, the shell 200 is made of insulating materials such as plastic and is integrally formed by injection molding.

[0048] Exemplarily, the circuit breaker further comprises a first arc striking plate 300, a second arc striking plate 400, a static contact 500 and a moving contact 600. The first arc striking plate 300 and the second arc striking plate 400 are arranged in the shell 200. The static contact 500 is arranged on the first arc striking plate 300. The moving contact 600 is rotatably arranged in the shell 200 and can be attracted to or broken away from the static contact 500. One end of the first arc striking plate 300 close to the first arc striking arc extinguishing fin 21 abuts against the first arc striking arc extinguishing fin 21. One end of the second arc striking plate 400 close to the second arc striking arc extinguishing fin 22 abuts against the second arc striking arc extinguishing fin 22. When the moving contact 600 is broken away from the static contact 500, an electric arc is generated. The upper end of the electric arc sequentially passes through the first arc striking plate 300 and the first arc striking arc extinguishing fin 21 and then enters the arc extinguishing chamber 100, and is divided and extinguished by the first arc striking arc extinguishing fin 21 and the plurality of arc extinguishing fins 23. The lower end of the electric arc sequentially passes through the second arc striking plate 400 and the second arc striking arc extinguishing fin 22 and then enters the arc extinguishing chamber 100, and is divided and extinguished by the second arc striking arc extinguishing fin 22 and the plurality of arc extinguishing fins 23.

[0049] Further, as shown in Figures 4 to 6As shown, the first arc striking plate 300 is provided with a first bending part 301 close to one end of the first arc striking and extinguishing piece 21, and the first bending part 301 abuts against the first arc striking and extinguishing piece 21; and / or the second arc striking plate 400 is provided with a second bending part 401 close to one end of the second arc striking and extinguishing piece 22, and the second bending part 401 abuts against the second arc striking and extinguishing piece 22. The first arc striking plate 300 and the first arc striking plate 300 are both made of conductive metal material, and by adding the first bending part 301 and the second bending part 401, the reliable contact of the first arc striking plate 300 with the first arc striking and extinguishing piece 21 and the second arc striking plate 400 with the second arc striking and extinguishing piece 22 is ensured.

[0050] Optionally, the second arc striking plate 400 is provided with an opening 402. By adding the opening 402, the line resistance is increased, and when the arc is transferred to the second arc striking plate 400, the resistance is large, the current limiting capacity is strong, the arc striking energy is reduced, and the arc is extinguished quickly.

[0051] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation of the embodiments of the utility model. For the ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, all the embodiments are not required to be exhausted. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. An arc chamber, characterized in that The application relates to an arc extinguishing chamber. The first unit (1) comprises two cheek plates (12) oppositely arranged, and a containing space (13) is formed between the two cheek plates (12); the second unit (2) comprises a first arc striking and extinguishing sheet (21), a plurality of arc extinguishing sheet pieces (23) and a second arc striking and extinguishing sheet (22) which are sequentially and layerwisely arranged along a third direction, the first arc striking and extinguishing sheet (21), the second arc striking and extinguishing sheet (22) and the plurality of arc extinguishing sheet pieces (23) are arranged in the containing space (13) and extend along a first direction, the plurality of arc extinguishing sheet pieces (23) are located between the first arc striking and extinguishing sheet (21) and the second arc striking and extinguishing sheet (22), the first arc striking and extinguishing sheet (21) and the second arc striking and extinguishing sheet (22) extend along the first direction and the lengths of the first arc striking and extinguishing sheet (21) and the second arc striking and extinguishing sheet (22) along the first direction are greater than the length of the arc extinguishing sheet piece (23) along the first direction, and the first direction and the third direction are perpendicular to each other. The part of the first arc striking and extinguishing sheet (21) extending out of the containing space (13) is provided with a first widened plate part (211) extending along a second direction; and / or 2. The arc chute according to claim 1, characterized in that The part of the second arc striking and extinguishing sheet (22) extending out of the containing space (13) is provided with a second widened plate part (221) extending along a second direction, and the first direction, the second direction and the third direction are perpendicular to each other. The first arc striking and extinguishing sheet (21), the second arc striking and extinguishing sheet (22) and the plurality of arc extinguishing sheet pieces (23) are detachably connected with the two cheek plates (12).

3. The arc chute of claim 1, wherein, The cheek plate (12) is provided with a first clamping hole (121), the two sides of the first arc striking and extinguishing sheet (21) are provided with first clamping protrusions (212), and the first clamping protrusions (212) are inserted into the first clamping hole (121); and / or 4. The arc chute of claim 3, wherein, The cheek plate (12) is provided with a second clamping hole (122), the two sides of the second arc striking and extinguishing sheet (22) are provided with second clamping protrusions (222), and the second clamping protrusions (222) are inserted into the second clamping hole (122). The cheek plate (12) is provided with a plurality of third clamping holes (123) which are arranged at intervals along a third direction, the two sides of the arc extinguishing sheet piece (23) are provided with third clamping protrusions (231), and the third clamping protrusions (231) are inserted into the third clamping holes (123).

5. The arc chute of claim 3, wherein, The application further comprises a connecting plate (11), the two cheek plates (12) are respectively arranged at the two ends of the connecting plate (11), a containing groove is formed between the connecting plate (11) and the two cheek plates (12), and a plurality of air holes (111) are arranged on the connecting plate (11).

6. The arc chute according to any one of claims 1 to 5, characterized in that The application relates to an arc extinguishing chamber.

7. A circuit breaker characterized by The application relates to an arc extinguishing chamber.

8. The circuit breaker of claim 7, wherein, The circuit breaker further comprises a first arc striking plate (300), a second arc striking plate (400), a static contact (500) and a moving contact (600), the first arc striking plate (300) and the second arc striking plate (400) are arranged in the shell (200), the static contact (500) is arranged on the first arc striking plate (300), the moving contact (600) is rotationally arranged in the shell (200) and can be attracted to or disconnected from the static contact (500), one end of the first arc striking plate (300) close to the first arc striking plate (21) abuts against the first arc striking plate (21), and one end of the second arc striking plate (400) close to the second arc striking plate (22) abuts against the second arc striking plate (22).

9. The circuit breaker of claim 8, wherein, The first arc striking plate (300) is provided with a first curved portion (301) at one end close to the first arc striking plate (21), and the first curved portion (301) abuts against the first arc striking plate (21); and / or The second arc striking plate (400) is provided with a second curved portion (401) at one end close to the second arc striking plate (22), and the second curved portion (401) abuts against the second arc striking plate (22).

10. The circuit breaker of claim 8, wherein, The second arc striking plate (400) is provided with an opening (402).

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