Circuit breaker

Abstract

The utility model relates to a circuit breaker, which comprises a shell, an operating mechanism, a moving contact, a static contact and an arc extinguishing mechanism, the operating mechanism, the moving contact, the static contact and the arc extinguishing mechanism are arranged in the shell, the arc extinguishing mechanism comprises an arc extinguishing chamber, the arc extinguishing chamber comprises a first arc extinguishing grid plate group, and the first arc extinguishing grid plate group is composed of a plurality of first arc extinguishing grid plates. The first arc extinguishing grid sheets are arranged along the horizontal direction or are arranged at an included angle of-alpha-alpha relative to the horizontal direction; the arc extinguish chamber comprises a second arc extinguish grid sheet group which is composed of a plurality of second arc extinguish grid sheets and is arranged below the first arc extinguish grid sheet group, and the inlet end of the second arc extinguish grid sheet group is close to the moving track of the moving contact. The second arc-extinguishing grid sheets are obliquely arranged at an angle beta relative to the horizontal direction, and the outlet ends of the second arc-extinguishing grid sheets incline towards the outlet end direction of the first arc-extinguishing grid sheet group; alpha is smaller than 20 degrees, and beta is larger than 45 degrees and smaller than 90 degrees. And by optimizing the layout of the arc extinguishing grid sheets, a more effective arc extinguishing effect is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to a circuit breaker. BACKGROUND

[0002] The circuit breaker is a mechanical switch appliance which can connect, carry and break the current under normal circuit conditions, and can also connect, carry for a certain time and break the current under the specified abnormal circuit conditions. The circuit breaker is mainly used for distributing electric energy and protecting the line and power supply equipment from the damage of overload, short circuit, single-phase grounding and other faults, and can be used for infrequent conversion of the line. The arc extinguishing chamber is usually installed in the circuit breaker, which mainly functions to make the electric arc between the moving contact and the static contact extinguish rapidly and realize the arc extinguishing function. The existing arc extinguishing chamber is mainly composed of arc extinguishing grid plates and an arc extinguishing grid plate mounting plate, and a plurality of arc extinguishing grid plates are installed in parallel and placed on the side of the moving contact. In the actual operation / use process, the longer the arc is extinguished, the greater the damage to the product. In order to overcome the defect that the arc extinguishing effect of the existing circuit breaker arc extinguishing chamber affects the breaking capacity, the circuit breaker manufacturers are developing arc extinguishing devices with better arc extinguishing performance. SUMMARY

[0003] The utility model aims at overcoming the shortcomings and deficiencies of the prior art and provides a circuit breaker.

[0004] The utility model discloses a technical scheme as follows: a circuit breaker, comprising a shell and an operating mechanism, a moving contact, a static contact and an arc extinguishing mechanism arranged in the shell, wherein the arc extinguishing mechanism comprises an arc extinguishing chamber, the arc extinguishing chamber comprises a first arc extinguishing grid plate group, the first arc extinguishing grid plate group is composed of a plurality of first arc extinguishing grid plates, the first arc extinguishing grid plates are arranged in the horizontal direction or at an angle of -α-α relative to the horizontal direction, an arc outlet is arranged on the outlet end of the first arc extinguishing grid plate group, the static contact is arranged on the inlet end of the first arc extinguishing grid plate group, and the moving contact performs opening and closing operations on the side of the static contact away from the first arc extinguishing grid plate group.

[0005] The arc extinguishing chamber comprises a second arc extinguishing grid plate group, the second arc extinguishing grid plate group is composed of a plurality of second arc extinguishing grid plates, the second arc extinguishing grid plate group is arranged below the first arc extinguishing grid plate group and the inlet end of the second arc extinguishing grid plate group is close to the moving track of the moving contact, the second arc extinguishing grid plates are arranged at an angle of β relative to the horizontal direction and the outlet end of the second arc extinguishing grid plates is inclined towards the outlet end of the first arc extinguishing grid plate group.

[0006] α is less than 20°, and β is greater than 45° and less than 90°.

[0007] The side edge of the second arc-extinguishing vane group far from the opening position of the moving contact is arranged close to the outlet end of the first arc-extinguishing vane group, and a first arc striking piece is arranged between the first arc-extinguishing vane group and the second arc-extinguishing vane group, the first arc striking piece comprises a first arc striking vane arranged on one side of the first arc-extinguishing vane group and a second arc striking vane arranged on one side of the second arc-extinguishing vane group, the first arc striking vane is arranged along the horizontal direction or at an angle of -α-α relative to the horizontal direction, the second arc striking vane is arranged at an angle of β relative to the horizontal direction, the second arc striking vane is connected to the first arc striking vane at the end far from the static contact, and a through hole is arranged at the position where the first arc striking vane and the second arc striking vane are connected.

[0008] The first arc-extinguishing vane and the first arc striking vane are both arranged along the horizontal direction and in parallel, and the second arc-extinguishing vane and the second arc striking vane are both arranged in parallel.

[0009] The outlet end of the second arc-extinguishing vane group and the outer end of the second arc striking vane are arranged close to the inner wall of the shell, a first slot is formed in the middle of the outlet end of the second arc-extinguishing vane, a second slot is formed in the middle of the outlet end of the second arc striking vane, and the first slot and the second slot cooperate with the inner wall of the shell to form a gas running channel.

[0010] The side edge of the second arc-extinguishing vane group far from the opening position of the moving contact is arranged close to the inlet end of the first arc-extinguishing vane group, and a third arc-extinguishing vane group is arranged between the side of the first arc-extinguishing vane group and the side of the second arc-extinguishing vane group close to each other, the third arc-extinguishing vane group is composed of a plurality of third arc-extinguishing vanes, the third arc-extinguishing vanes are arranged at an angle of (β-γ) relative to the horizontal direction, the spacing between the inlet ends of adjacent third arc-extinguishing vanes is smaller than the spacing between the outlet ends of the third arc-extinguishing vanes, the inlet end of the third arc-extinguishing vane is arranged close to the first arc-extinguishing vane group, (β-γ) is greater than 0 and smaller than β.

[0011] The first arc-extinguishing vane and the first arc striking vane are both arranged along the horizontal direction and in parallel, the second arc-extinguishing vane is arranged in parallel, and the third arc-extinguishing vane group is connected to the second arc-extinguishing vane group, a θ angle is formed between the third arc-extinguishing vane and the adjacent second arc-extinguishing vane or third arc-extinguishing vane, θ is greater than 0 and smaller than 10°, the inlet end of the third arc-extinguishing vane group is distributed in an arc shape, and the third arc-extinguishing vane far from the second arc-extinguishing vane group is arranged close to the first arc-extinguishing vane group.

[0012] The outlet end of the second arc-extinguishing vane group and the third arc-extinguishing vane group are arranged close to the inner wall of the shell and form a gas running channel between the inner wall of the shell.

[0013] The distance between the static contact and the arc-extinguishing chamber is 5mm-10mm.

[0014] The static contact has a third arc striking vane extending to the outside of the first arc-extinguishing vane group.

[0015] The arc extinguishing chamber comprises a second arc striking member, which is arranged at one end of the second arc extinguishing grid group away from the first arc extinguishing grid group and has an arc striking part corresponding to the open position of the moving contact.

[0016] The utility model discloses the beneficial effect is as follows: the utility model discloses the layout of arc extinguishing grid piece is optimized, sets up first arc extinguishing grid group and second arc extinguishing grid group, can realize the setting of more arc extinguishing grid piece, realizes more effective arc extinguishing effect comprehensively. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, below will to the drawing needed to use in the embodiment or prior art description simple introduction, obviously, below description's drawing only some embodiments of the utility model, for the ordinary skilled person in the art comes, under the premise of not paying the creative labor, according to these drawings obtains other drawings still belongs to the scope of the utility model.

[0018] Figure 1 It is internal structure schematic view of the utility model embodiment 1;

[0019] Figure 2 It is sectional view of the utility model embodiment 1;

[0020] Figure 3 It is structure schematic view of moving contact, static contact, arc extinguishing mechanism cooperation in the utility model embodiment 1;

[0021] Figure 4 It is sectional view of moving contact, static contact, arc extinguishing mechanism cooperation structure in the utility model embodiment 1;

[0022] Figure 5 It is structure schematic view of second arc extinguishing grid piece in the utility model embodiment 1;

[0023] Figure 6 It is structure schematic view of first arc striking member in the utility model embodiment 1;

[0024] Figure 7 It is layout schematic view of arc extinguishing chamber in the utility model embodiment 2;

[0025] In the drawing, the shell-100, the arc exit-110, the operating mechanism-200, the moving contact-300, the static contact-400, the third arc striking piece-410, the arc extinguishing mechanism-500, the first arc extinguishing grid-510, the second arc extinguishing grid-520, the first slot-521, the first arc striking member-530, the first arc striking piece-531, the second arc striking piece-532, the through opening-533, the second slot-534, the second arc striking member-540, the gas running channel-550, the slit assembly-560, the magnetic enhancement member-570, the third arc extinguishing screen-580. Detailed Implementation

[0026] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0027] It should be noted that all uses of "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0028] The directional and positional terms used in this utility model, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0029] Example 1:

[0030] A type of circuit breaker, such as Figures 1-2 As shown, the circuit includes a housing 100 and an operating mechanism 200, a moving contact 300, a stationary contact 400, and an arc-extinguishing mechanism 500 disposed within the housing 100. The operating mechanism 200 is connected to the moving contact 300 and is used to drive the moving contact 300 to perform opening and closing actions. It also has the function of tripping and opening the circuit. The housing 100 is also equipped with a trip unit and an overheat protection structure for driving the moving contact 300 to automatically open the circuit. The structure and principle are basically the same as those of the operating mechanism in a conventional circuit breaker, and will not be described in detail here.

[0031] The arc-extinguishing mechanism 500 is designed for the locations of the moving contact 300 and the stationary contact 400 to eliminate the electric arc formed between them when they break. Specifically, as shown... Figure 3 , Figure 4As shown, the arc extinguishing mechanism 500 includes an arc extinguishing chamber, a slit assembly 560 and a magnetic enhancement member 570. The slit assembly 560 is composed of two gas generating plates which are arranged at a certain interval to form a slit. The moving contact 300 and the stationary contact 400 are both located in the slit, so that the generated arc directly acts on the gas generating plates, and the gas generated forms a gas blowing effect of quickly blowing the arc to the arc extinguishing chamber. The magnetic enhancement member 570 is arranged outside the slit assembly 560 to form an effect of enhancing the arc blowing magnetic field. The arc extinguishing chamber includes a first arc extinguishing grid group, a second arc extinguishing grid group and a first arc striking member 530. The first arc extinguishing grid group is composed of a plurality of first arc extinguishing grids 510. The first arc extinguishing grids 510 are arranged along the horizontal direction or are arranged at an angle of -α—α relative to the horizontal direction. The housing 100 is provided with an arc outlet 110 near the outlet end of the first arc extinguishing grid group. The second arc extinguishing grid group is composed of a plurality of second arc extinguishing grids 520. The second arc extinguishing grid group is arranged below the first arc extinguishing grid group and the inlet end thereof is close to the moving track of the moving contact 300. The second arc extinguishing grids 520 are arranged at an angle of β relative to the horizontal direction and the outlet end thereof is inclined toward the direction of the outlet end of the first arc extinguishing grid group. α is less than 20°, and β is greater than 45° and less than 90°. The conventional arc extinguishing chamber usually has the first arc extinguishing grid group. When the moving contact 300 and the stationary contact 400 are disconnected, the arc formed between the two passes through the first arc extinguishing grid group for arc splitting and extinguishing, and is then discharged through the arc outlet 110 of the housing 100. In this embodiment, the second arc extinguishing grid group is added on the basis of the conventional first arc extinguishing grid group. The second arc extinguishing grid group is located below the moving track of the moving contact 300. In this way, more arc extinguishing grids can be arranged, and the more arc extinguishing grids are distributed along the moving track of the moving contact 300 from the closed position to the open position, so that the effect of efficient arc extinguishing is achieved. Moreover, the outlet end of the second arc extinguishing grid 520 is inclined toward the direction of the outlet end of the first arc extinguishing grid group, so that the ionized arc after arc splitting and extinguishing by the second arc extinguishing grid 520 is discharged more quickly through the arc outlet 110 of the housing 100.

[0032] Among them, the first arc extinguishing grids 510 can be in parallel relationship, or the adjacent first arc extinguishing grids 510 can have a small angle between them. In this embodiment, the first arc extinguishing grids 510 are arranged in parallel.

[0033] Among them, the first arc extinguishing grids 510 can be arranged along the horizontal direction, or can be inclined at an angle of -α—α relative to the horizontal direction. In this embodiment, the first arc extinguishing grids 510 are arranged along the horizontal direction.

[0034] The tilt angle β of the different second arc-extinguishing grid plates 520 can be equal or unequal. That is, the second arc-extinguishing grid plates 520 can be parallel to each other or have a small angle between adjacent first arc-extinguishing grid plates 510. In this embodiment, β is equal, that is, the second arc-extinguishing grid plates 520 are set to be parallel.

[0035] The second arc-extinguishing grid group is located near the outlet end of the first arc-extinguishing grid group on one side away from the opening position of the moving contact 300. A first arc-inducing element 530 is provided between the first and second arc-extinguishing grid groups. The first arc-inducing element 530 includes a first arc-inducing piece 531 located on one side of the first arc-extinguishing grid group and a second arc-inducing piece 532 located on one side of the second arc-extinguishing grid group. The first arc-inducing piece 531 is arranged horizontally or at an angle of -α to α relative to the horizontal direction. The second arc-inducing piece 532 is inclined at an angle β relative to the horizontal direction. The second arc-inducing piece 532 is connected to the end of the first arc-inducing piece 531 away from the stationary contact 400. A through-hole 533 is provided at the position where the first arc-inducing piece 531 and the second arc-inducing piece 532 are connected, forming a better transition arc-inducing effect between the first and second arc-extinguishing grid groups.

[0036] In this embodiment, the first arc-extinguishing grid plate 510 and the first arc-inducing plate 531 are arranged in parallel, and the second arc-extinguishing grid plate 520 and the second arc-inducing plate 532 are arranged in parallel.

[0037] Furthermore, the outlet end of the second arc-extinguishing grid assembly and the outer end of the second arc-inducing plate 532 are located close to the inner wall of the housing 100, forming an air vent 550 between them. The air vent 550 facilitates the discharge of the ionized arc generated by the second arc-extinguishing grid assembly.

[0038] Furthermore, such as Figure 5 As shown, a first notch 521 is formed in the middle of the outlet end of the second arc-extinguishing grid plate 520, and a second notch 534 is formed in the middle of the outlet end of the second arc-inducing plate 532. The first notch 521 and the second notch 534 cooperate with the inner wall of the housing 100 to form an air duct 550. This saves space.

[0039] Furthermore, the distance between the stationary contact 400 and the arc-extinguishing chamber is 5mm-10mm. This allows the arc from the stationary contact 400 to be quickly guided into the arc-extinguishing chamber, specifically through the first arc-extinguishing grid assembly. Furthermore, the stationary contact 400 has a third arc-inducing piece 410 extending to the outside of the first arc-extinguishing grid assembly.

[0040] The design of the through-hole 533 prevents the electric arc from accumulating in the bending area between the first arc-starting plate 531 and the second arc-starting plate 532.

[0041] Further, the arc-extinguishing chamber comprises a second arc striking member 540, which is arranged at one end of the second arc-extinguishing grid group away from the first arc-extinguishing grid group and has an arc striking part corresponding to the open position of the movable contact 300.

[0042] Embodiment 2:

[0043] The structure of this embodiment is basically the same as that of Embodiment 1, and the only difference is the layout of the arc-extinguishing chamber. As shown in Figure 7 the side edge of the second arc-extinguishing grid group away from the open position of the movable contact 300 is arranged close to the inlet end of the first arc-extinguishing grid group, and a third arc-extinguishing grid group is arranged between the sides close to the first arc-extinguishing grid group and the second arc-extinguishing grid group. The third arc-extinguishing grid group is composed of a plurality of third arc-extinguishing grids 580, which are arranged at an angle of β-γ relative to the horizontal direction. The spacing between the inlet ends of adjacent third arc-extinguishing grids 580 is smaller than that between the outlet ends, and the inlet end of the third arc-extinguishing grid 580 is arranged close to the first arc-extinguishing grid group. β-γ is greater than 0 and less than β. The first arc-extinguishing grid group and the second arc-extinguishing grid group are connected through the fan-shaped third arc-extinguishing grid group, which can achieve better and faster arc extinguishing.

[0044] Further, in this embodiment, the first arc-extinguishing grids 510 are all arranged in parallel along the horizontal direction; the second arc-extinguishing grids 520 are all arranged in parallel; the third arc-extinguishing grid group connects the second arc-extinguishing grid group, and the third arc-extinguishing grids 580 form an angle θ with the adjacent second arc-extinguishing grids 520 or third arc-extinguishing grids 580, θ is greater than 0 and less than 10°, the inlet end of the third arc-extinguishing grid group is arranged in an arc shape, and the third arc-extinguishing grids 580 away from the second arc-extinguishing grid group are arranged close to the first arc-extinguishing grid group.

[0045] The outlet end of the second arc-extinguishing grid group and the third arc-extinguishing grid group are arranged close to the inner wall of the shell 100 and form a gas running channel 550 with the inner wall of the shell 100. Specifically, the structure of the second arc-extinguishing grid 520 of this embodiment is the same as that of Embodiment 1, as shown in Figure 5 the middle part of the outlet end of the second arc-extinguishing grid 520 forms a first missing slot 521, and the first missing slot 521 cooperates with the inner wall of the shell 100 to form a gas running channel 550. The third arc-extinguishing grid group of this embodiment is fan-shaped, and the outlet end is separated from the inner wall of the shell 100 by a certain distance to directly form a gas running channel 550. The third arc-extinguishing grid 580 of this embodiment adopts the same arc-extinguishing grid structure as the second arc-extinguishing grid 520 of Embodiment 1, so that the third arc-extinguishing grids 580 close to the second arc-extinguishing grid group can form a larger area with the inner wall of the shell 100 for gas running.

[0046] The above disclosed is only the preferred embodiment of the present application, of course, cannot be limited by this to limit the scope of the present application, therefore, the equivalent changes made according to the present application claims, still belong to the scope covered by the present application.

Claims

1. A circuit breaker comprising a housing (100) and an operating mechanism (200), a moving contact (300), a stationary contact (400), and an arc extinguishing mechanism (500) disposed in the housing (100), the arc extinguishing mechanism (500) comprising an arc extinguishing chamber, the arc extinguishing chamber comprising a first arc extinguishing vane group, the first arc extinguishing vane group consisting of a plurality of first arc extinguishing vanes (510), the first arc extinguishing vanes (510) being arranged in a horizontal direction or at an angle of -α-α relative to the horizontal direction, the housing (100) being provided with an arc outlet (110) near an outlet end of the first arc extinguishing vane group, the stationary contact (400) being arranged near an inlet end of the first arc extinguishing vane group, and the moving contact (300) being arranged on a side of the stationary contact (400) away from the first arc extinguishing vane group to perform opening and closing operations; the arc extinguishing chamber comprising a second arc extinguishing vane group, the second arc extinguishing vane group consisting of a plurality of second arc extinguishing vanes (520), the second arc extinguishing vane group being arranged below the first arc extinguishing vane group and having an inlet end close to a moving track of the moving contact (300), the second arc extinguishing vanes (520) being arranged at an angle of β relative to the horizontal direction and being inclined toward the outlet end of the first arc extinguishing vane group; α is less than 20°, and β is greater than 45° and less than 90°. characterized in that An edge of the second arc extinguishing vane group away from a position of the moving contact (300) during opening is arranged near the outlet end of the first arc extinguishing vane group, and a first arc guiding member (530) is arranged between the first arc extinguishing vane group and the second arc extinguishing vane group, the first arc guiding member (530) comprising a first arc guiding vane (531) arranged on a side of the first arc extinguishing vane group and a second arc guiding vane (532) arranged on a side of the second arc extinguishing vane group, the first arc guiding vane (531) being arranged in a horizontal direction or at an angle of -α-α relative to the horizontal direction, the second arc guiding vane (532) being arranged at an angle of β relative to the horizontal direction, and the second arc guiding vane (532) being connected to the first arc guiding vane (531) at an end away from the stationary contact (400), and a through hole (533) being arranged at a position where the first arc guiding vane (531) and the second arc guiding vane (532) are connected. The first arc extinguishing vanes (510) and the first arc guiding vanes (531) are arranged in parallel in the horizontal direction, and the second arc extinguishing vanes (520) and the second arc guiding vanes (532) are arranged in parallel.

2. The circuit breaker of claim 1, wherein: An outer end of the second arc extinguishing vane group and the second arc guiding vane (532) is arranged near an inner wall of the housing (100), a first slot (521) is formed in a middle portion of an outlet end of the second arc extinguishing vane (520), a second slot (534) is formed in a middle portion of an outlet end of the second arc guiding vane (532), and the first slot (521) and the second slot (534) cooperate with the inner wall of the housing (100) to form a gas running channel (550).

3. The circuit breaker of claim 2, wherein: ​ 4. The circuit breaker of claim 2 or 3, wherein: ​ 5. The circuit breaker of claim 1, wherein: The second arc-extinguishing fin group is arranged close to the inlet end of the first arc-extinguishing fin group away from the side edge of the moving contact (300) in the open position, and a third arc-extinguishing fin group is arranged between the side close to the first arc-extinguishing fin group and the second arc-extinguishing fin group, the third arc-extinguishing fin group is composed of a plurality of third arc-extinguishing fins (580), the third arc-extinguishing fins (580) are arranged at an angle (β-γ) relative to the horizontal direction, the spacing of the inlet end between adjacent third arc-extinguishing fins (580) is smaller than the spacing of the outlet end, and the inlet end of the third arc-extinguishing fin (580) is arranged close to the first arc-extinguishing fin group, (β-γ) is greater than 0 and less than β.

6. The circuit breaker of claim 5, wherein: The first arc-extinguishing fins (510) are all arranged parallel in the horizontal direction; the second arc-extinguishing fins (520) are all arranged parallel; the third arc-extinguishing fin group is connected with the second arc-extinguishing fin group, the third arc-extinguishing fins (580) and the adjacent second arc-extinguishing fins (520) or third arc-extinguishing fins (580) form an angle θ, θ is greater than 0 and less than 10°, the inlet end of the third arc-extinguishing fin group is arranged in an arc line, and the third arc-extinguishing fins (580) away from the second arc-extinguishing fin group on one side tend to be arranged close to the first arc-extinguishing fin group.

7. The circuit breaker of claim 5 or 6, wherein: The outlet end of the second arc-extinguishing fin group and the third arc-extinguishing fin group are arranged close to the inner wall of the shell (100) and form a gas running channel (550) between the inner wall of the shell (100).

8. The circuit breaker of any of claims 1-3, 5-6, wherein: The distance between the stationary contact (400) and the arc-extinguishing chamber is 5-10 mm.

9. The circuit breaker of any of claims 1-3, 5-6, wherein: The stationary contact (400) has a third arc guiding fin (410) extending to the outside of the first arc-extinguishing fin group.

10. The circuit breaker of any of claims 1-3, 5-6, wherein: The arc-extinguishing chamber comprises a second arc guiding member (540), the second arc guiding member (540) is arranged at one end of the second arc-extinguishing fin group away from the first arc-extinguishing fin group and has an arc guiding part corresponding to the open position of the moving contact (300).

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