An arc extinguishing mechanism for a circuit breaker and a circuit breaker

Abstract

The present invention discloses an arc extinguishing mechanism for a circuit breaker and a circuit breaker. The arc extinguishing mechanism for the circuit breaker includes: a housing; an arc extinguishing chamber disposed within the housing; an arc guiding structure disposed within the housing and located on a side of the arc extinguishing chamber close to the contact mechanism. The arc guiding structure includes a plurality of arc guiding protrusions and a plurality of arc guiding grooves. The arc guiding protrusions extend towards the arc extinguishing chamber to guide the electric arc, and the arc guiding grooves are formed on the side portions of the arc guiding protrusions and communicate with the arc extinguishing chamber. The arc guiding protrusions have a plurality of connecting portions, and the connecting portions communicate the plurality of arc guiding grooves. For an arc extinguishing mechanism for a circuit breaker with this structure, when the electric arc passes through the arc guiding grooves, the electric arc will be quickly elongated and segmented to quickly introduce the electric arc into the arc extinguishing chamber. The connecting portions communicate different arc guiding grooves, enabling automatic adjustment of the arc gas flow, equalizing the movement speeds of the arc gas flows in different arc guiding grooves, thereby accelerating the speed of arc extinguishing and avoiding potential safety hazards.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage electrical appliances, and particularly relates to an arc extinguishing mechanism for a circuit breaker and a circuit breaker. Background Art

[0002] As an important component of a low-voltage power grid, a low-voltage circuit breaker can quickly break the circuit, especially when a large short-circuit current appears in the circuit, thereby ensuring that the power grid is not damaged. During the process of breaking the current, an arc will be generated. If the arc burns on the moving and static contacts for a long time without being introduced into the arc extinguishing chamber, the current breaking will fail; even if the arc can be introduced into the arc extinguishing chamber, if it cannot leave the moving and static contacts quickly, a large amount of damage will still occur on the surfaces of the moving and static contacts, thus affecting the overall electrical life of the circuit breaker.

[0003] The prior art discloses an arc extinguishing mechanism for a circuit breaker, which includes an arc extinguishing chamber and an arc guiding structure. The arc guiding structure includes a plurality of continuous arc-shaped protrusions and arc guiding grooves. The side of the arc-shaped protrusion forms an arc guiding groove, and the arc is guided into the arc extinguishing chamber through the arc guiding groove.

[0004] However, for the above-mentioned arc extinguishing mechanism for a circuit breaker, the arc airflows in different arc guiding grooves are different. The movement speed of the arc airflow in some arc guiding grooves is slow, which slows down the arc extinguishing speed and poses a safety hazard. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the movement speed of the arc airflow in some arc guiding grooves in the arc extinguishing mechanism of the existing circuit breaker is slow, which slows down the arc extinguishing speed and poses a safety hazard, so as to provide an arc extinguishing mechanism for a circuit breaker and a circuit breaker.

[0006] An arc extinguishing mechanism for a circuit breaker includes:

[0007] A housing;

[0008] An arc extinguishing chamber, which is arranged in the housing;

[0009] An arc guiding structure, which is arranged in the housing and on the side of the arc extinguishing chamber close to the contact mechanism. The arc guiding structure includes a plurality of arc guiding protrusions and a plurality of arc guiding grooves. The arc guiding protrusions extend towards the arc extinguishing chamber to guide the arc. The arc guiding grooves are formed on the side of the arc guiding protrusions and communicate with the arc extinguishing chamber. The arc guiding protrusions have a plurality of communication parts, and the communication parts communicate with the plurality of arc guiding grooves.

[0010] Further, the communication part is a communication hole and / or an open slot.

[0011] Further, the arc guiding protrusion is arc-shaped and protrudes arc-shaped in the direction away from the contact mechanism.

[0012] Further, a plurality of arc ignition protrusions are provided, and the communication parts located on different arc ignition protrusions are staggeredly arranged.

[0013] Further, the arc extinguishing chamber includes a plurality of arc extinguishing grid sheets; an end of the arc ignition protrusion close to the arc extinguishing chamber and an end of the arc extinguishing grid sheet close to the arc ignition protrusion are arranged at intervals.

[0014] Further, an exhaust arc extinguishing structure is further included, which is arranged in the shell and on a side of the arc extinguishing chamber away from the contact mechanism, and the arc is discharged from the shell through the exhaust arc extinguishing structure.

[0015] Further, the exhaust arc extinguishing structure includes an exhaust protrusion, an exhaust runway and an exhaust port. The exhaust protrusion extends from the arc extinguishing chamber towards the exhaust port. The exhaust runway is formed on a side of the exhaust protrusion and communicates with the arc extinguishing chamber. The exhaust port is arranged on the shell and communicates with the exhaust runway.

[0016] Further, the exhaust arc extinguishing structure further includes an exhaust blocking member, and the exhaust blocking member is arranged on a side wall of part or all of the exhaust runway.

[0017] Further, the exhaust blocking member is inclined towards the direction where the exhaust port is located.

[0018] A circuit breaker includes: the arc extinguishing mechanism for a circuit breaker as described above.

[0019] The technical solution of the present invention has the following advantages:

[0020] 1. An arc extinguishing mechanism for a circuit breaker provided by the present invention includes: a shell; an arc extinguishing chamber arranged in the shell; an arc ignition structure arranged in the shell and on a side of the arc extinguishing chamber close to the contact mechanism. The arc ignition structure includes a plurality of arc ignition protrusions and a plurality of arc ignition grooves. The arc ignition protrusions extend towards the arc extinguishing chamber to guide the arc. The arc ignition grooves are formed on the side of the arc ignition protrusions and communicate with the arc extinguishing chamber. The arc ignition protrusions have a plurality of communication parts, and the communication parts communicate with a plurality of the arc ignition grooves. For an arc extinguishing mechanism for a circuit breaker with such a structure, when the arc passes through the arc ignition grooves, the arc will be quickly stretched and divided to quickly introduce the arc into the arc extinguishing chamber. The communication parts communicate with different arc ignition grooves, which can realize the automatic adjustment of the arc gas flow, balance the movement speeds of the arc gas flows in different arc ignition grooves, thereby accelerating the arc extinguishing speed and avoiding potential safety hazards.

[0021] 2. An arc extinguishing mechanism for a circuit breaker provided by the present invention, the exhaust arc extinguishing structure includes an exhaust protrusion, an exhaust runway, and an exhaust port. The exhaust protrusion extends from the arc extinguishing chamber towards the exhaust port. The exhaust runway is formed on the side of the exhaust protrusion and communicates with the arc extinguishing chamber. The exhaust port is provided on the housing and communicates with the exhaust runway. An arc extinguishing mechanism for a circuit breaker with this structure avoids the re-ignition of the arc flowing out of the arc extinguishing chamber by setting the exhaust arc extinguishing structure.

[0022] 3. An arc extinguishing mechanism for a circuit breaker provided by the present invention, the exhaust arc extinguishing structure further includes an exhaust blocking member, and the exhaust blocking member is provided on the side wall of part or all of the exhaust runway. An arc extinguishing mechanism for a circuit breaker with this structure can effectively block the discharge of metal particles when the arc burns in the arc extinguishing chamber by setting the exhaust blocking member, avoiding accidents.

[0023] 4. An arc extinguishing mechanism for a circuit breaker provided by the present invention, the exhaust blocking member is inclined towards the direction where the exhaust port is located. An arc extinguishing mechanism for a circuit breaker with this structure facilitates the discharge of the arc gas flow.

[0024] 5. A circuit breaker provided by the present invention includes: the arc extinguishing mechanism for a circuit breaker as described above. A circuit breaker with this structure naturally has all the advantages brought by including the above-mentioned arc extinguishing mechanism for a circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a schematic structural diagram of the arc extinguishing mechanism for a circuit breaker provided in Embodiment 1 of the present invention;

[0027] Figure 2 is Figure 1 A schematic structural diagram of the arc extinguishing mechanism shown without showing structures such as the arc extinguishing chamber;

[0028] Figure 3 is Figure 1 A partial enlarged view of the arc extinguishing grid and the arc guiding protrusion shown;

[0029] Figure 4 is Figure 1 A partial enlarged view of the exhaust protrusion and the air outlet shown;

[0030] Description of the drawing reference numerals:

[0031] 1 - Housing;

[0032] 21 - Arc extinguishing grid, 22 - Arc extinguishing mounting housing, 23 - Air outlet;

[0033] 3 - Operating mechanism;

[0034] 4 - Contact mechanism;

[0035] 51 - Arc starting projection, 52 - Arc starting groove, 53 - Open groove;

[0036] 61 - Exhaust projection, 62 - Exhaust runway, 63 - Exhaust port, 64 - Exhaust blocking member, 65 - L-shaped part, 66 - Arc-shaped connecting part, 67 - Inclined connecting part, 68 - Horizontal part. Detailed implementation manners

[0037] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0040] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0041] Embodiment 1

[0042] This embodiment provides an arc extinguishing mechanism for a circuit breaker as shown in Figures 1 to 4 , which includes: a housing 1, an arc extinguishing chamber, an arc leading structure, and an exhaust arc extinguishing structure. The arc extinguishing chamber is arranged inside the housing 1 and includes a plurality of arc extinguishing grid plates 21 and an arc extinguishing mounting housing 22. The arc extinguishing grid plates 21 are mounted on the arc extinguishing mounting housing 22, and an air outlet 23 is provided on the arc extinguishing mounting housing 22; the arc leading structure is arranged inside the housing 1 and on the side of the arc extinguishing chamber close to the contact mechanism 4; the exhaust arc extinguishing structure is arranged inside the housing 1 and on the side of the arc extinguishing chamber away from the contact mechanism 4, and the arc is discharged from the housing 1 through the exhaust arc extinguishing structure.

[0043] As shown in Figure 1 , the arc leading structure in this embodiment includes a plurality of arc leading protrusions 51 and a plurality of arc leading grooves 52. The arc leading protrusions 51 extend towards the arc extinguishing chamber to guide the arc, and the arc leading grooves 52 are formed on the side of the arc leading protrusions 51 and communicate with the arc extinguishing chamber. Of course, the arc leading protrusion 51 can also be set to one. As shown in Figure 1 and Figure 3 , the arc leading protrusion 51 is arc-shaped and protrudes arc-shaped in the direction away from the contact mechanism 4; and the end of the arc leading protrusion 51 close to the arc extinguishing chamber and the end of the arc extinguishing grid plate 21 close to the arc leading protrusion 51 are arranged at intervals.

[0044] Among them, the arc leading protrusion 51 has a number of connecting parts, and the connecting parts connect a plurality of arc leading grooves 52. Specifically, referring to Figure 1 and Figure 2 , the connecting part in this embodiment is an open slot 53, that is, the connecting part is open. Of course, the connecting part can also be a connecting hole; or when there are a plurality of connecting parts, some connecting parts can be connecting holes and some connecting parts can be open slots 53. As shown in Figure 2 , the connecting parts on different arc leading protrusions 51 are arranged staggeredly.

[0045] As shown in Figure 1 and Figure 2 , the exhaust arc extinguishing structure in this embodiment includes an exhaust protrusion 61, an exhaust runway 62, an exhaust port 63, and an exhaust blocking member 64. The exhaust protrusion 61 extends from the arc extinguishing chamber towards the exhaust port 63, the exhaust runway 62 is formed on the side of the exhaust protrusion 61 and communicates with the arc extinguishing chamber, the exhaust port 63 is provided on the housing 1 and communicates with the exhaust runway 62, and an exhaust blocking member 64 is provided on the side wall of part or all of the exhaust runway 62. Specifically, the side wall of the exhaust runway 62 can be formed by the exhaust protrusion, or by the bottom wall on the housing, or by the protrusions required by other mechanisms on the housing, or by the above-mentioned components together.

[0046] By providing the exhaust arc extinguishing structure, the re-ignition of the arc flowing out of the arc extinguishing chamber is avoided; by providing the exhaust blocking member 64, the metal particles during the combustion of the arc in the arc extinguishing chamber can be effectively blocked from being discharged, avoiding accidents.

[0047] Specifically, the exhaust protrusion 61 includes an L-shaped portion 65, a connecting portion, and a horizontal portion 68. The L-shaped portion 65 is bent toward the arc extinguishing chamber and away from the operating mechanism 3. The connecting portion connects the L-shaped portion 65 and the horizontal portion 68, and the horizontal portion 68 is connected to the housing 1. The connecting portion is an arc-shaped connecting portion 66, and / or the connecting portion is an inclined connecting portion 67. And when the connecting portion is the arc-shaped connecting portion 66, the arc-shaped connecting portion 66 protrudes toward the arc extinguishing chamber; when the connecting portion is the inclined connecting portion 67, the inclined connecting portion 67 is inclined in a direction away from the operating mechanism 3 along a direction away from the arc extinguishing chamber.

[0048] Specifically, two exhaust protrusions 61 are provided in this embodiment. Three exhaust channels 62 are formed, and three exhaust ports 63 are provided and are respectively arranged in one-to-one correspondence with the exhaust channels 62. Of course, the numbers of the exhaust protrusions 61, the exhaust channels 62, and the exhaust ports 63 are not limited and can be selected according to actual needs.

[0049] The side wall of the exhaust channel 62 closest to the operating mechanism 3 is not provided with an exhaust blocking member 64, and the connecting portion of the exhaust protrusion 61 below the exhaust channel 62 closest to the operating mechanism 3 is an arc-shaped connecting portion 66; while the side walls of the other two exhaust channels 62 are provided with exhaust blocking members 64, and the connecting portion of the exhaust protrusion 61 below the exhaust channel 62 in the middle is an inclined connecting portion 67. And the channel width of the exhaust channel 62 closest to the operating mechanism 3 and located in the horizontal portion 68 is smaller than the channel widths of the other exhaust channels 62 and located in the horizontal portion 68. Of course, exhaust blocking members 64 can also be provided on the side walls of all the exhaust channels 62. The exhaust blocking member 64 is inclined in the direction of the exhaust port 63, which is convenient for the discharge of the arc gas flow. Of course, the exhaust blocking member 64 can also be arranged vertically or inclined in the direction of the arc extinguishing chamber.

[0050] As Figure 4 shown, the exhaust protrusion 61 is arranged to avoid the air outlet 23, so that the exhaust protrusion 61 does not block the air outlet 23, which is convenient for the arc gas flow to flow out from the air outlet 23 in the arc extinguishing chamber; and the adjacent L-shaped portions 65 are arranged at intervals of multiple air outlets 23.

[0051] In an arc extinguishing mechanism for a circuit breaker according to the present invention, when the arc passes through the arc guiding groove 52, the arc will be quickly stretched and divided to quickly introduce the arc into the arc extinguishing chamber. The communication portion communicates different arc guiding grooves 52, which can realize the automatic adjustment of the arc gas flow, balance the movement speeds of the arc gas flows in different arc guiding grooves 52, thereby accelerating the arc extinguishing speed and avoiding potential safety hazards.

[0052] Embodiment 2

[0053] This embodiment provides a circuit breaker, including the arc extinguishing mechanism for a circuit breaker mentioned in Embodiment 1.

[0054] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the present invention.

Claims

1. An arc extinguishing mechanism for a circuit breaker, characterized in that, Comprising: A housing; An arc extinguishing chamber, which is arranged inside the housing; An arc ignition structure, which is arranged inside the housing and on one side of the arc extinguishing chamber close to the contact mechanism. The arc ignition structure includes a plurality of arc ignition protrusions and a plurality of arc ignition grooves. The arc ignition protrusions extend towards the arc extinguishing chamber to guide the arc. The arc ignition grooves are formed on the side of the arc ignition protrusions and communicate with the arc extinguishing chamber. Among them, the arc ignition protrusions have a plurality of communication parts, and the communication parts communicate with a plurality of the arc ignition grooves; The communication part is a communication hole and / or an open groove; The arc ignition protrusion is arranged in an arc shape and protrudes in an arc shape in a direction away from the contact mechanism; A plurality of the arc ignition protrusions are provided, and the communication parts on different arc ignition protrusions are arranged staggeredly.

2. An arc extinguishing mechanism for a circuit breaker according to claim 1, characterized in that, The arc extinguishing chamber includes a plurality of arc extinguishing grid sheets; the end of the arc ignition protrusion close to the arc extinguishing chamber and the end of the arc extinguishing grid sheet close to the arc ignition protrusion are arranged at intervals.

3. An arc extinguishing mechanism for a circuit breaker according to claim 1, characterized in that, It further includes an exhaust arc extinguishing structure, which is arranged inside the housing and on one side of the arc extinguishing chamber away from the contact mechanism, and the arc is discharged from the housing through the exhaust arc extinguishing structure.

4. The arc extinguishing mechanism for a circuit breaker according to claim 3, wherein, The exhaust arc extinguishing structure includes an exhaust protrusion, an exhaust runway and an exhaust port. The exhaust protrusion extends from the arc extinguishing chamber towards the exhaust port. The exhaust runway is formed on the side of the exhaust protrusion and communicates with the arc extinguishing chamber. The exhaust port is arranged on the housing and communicates with the exhaust runway.

5. An arc extinguishing mechanism for a circuit breaker according to claim 4, characterized in that, The exhaust arc extinguishing structure further includes an exhaust blocking member, and the exhaust blocking member is arranged on the side wall of part or all of the exhaust runway.

6. The arc extinguishing mechanism for a circuit breaker according to claim 5, characterized in that, The exhaust blocking member is inclined towards the direction where the exhaust port is located.

7. A circuit breaker, characterized in that, Comprising: The arc extinguishing mechanism for a circuit breaker according to any one of claims 1 to 6.

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