Circuit breaker

Abstract

The utility model relates to the technical field of circuit breakers, and particularly discloses a circuit breaker which comprises a shell, a contact assembly and an arc extinguishing assembly, the contact assembly comprises a static contact and a moving contact which are arranged in the shell, and the arc extinguishing assembly comprises an arc extinguishing chamber arranged in the shell and a run-on plate connected with the arc extinguishing chamber. The side, facing the static contact, of the run-on plate is provided with a protruding part in a protruding mode, and the protruding part is used for attracting electric arcs between the static contact and the run-on plate. The circuit breaker provided by the utility model is simple in structure, the surface area of the run-on plate is increased due to the arrangement of the lug boss, and the electric arc between the static contact and the run-on plate is attracted and guided through an electric field aggregation effect, so that the electric arc is quickly transferred to an arc extinguish chamber area, the arc striking and extinguishing effects are effectively improved, and the arc extinguishing time is shortened.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a circuit breaker. Background Technology

[0002] As a core protection component in low-voltage power distribution systems and electrical equipment, the core function of miniature circuit breakers is to quickly disconnect the circuit when faults such as short circuits and overloads occur. By extinguishing the fault arc, the current is cut off, thus preventing damage to electrical equipment or causing safety accidents. Therefore, the arc-extinguishing capability directly determines the breaking performance and protection reliability of the circuit breaker.

[0003] In existing technologies, the design of circuit breaker arc-starting plates typically employs multiple mutually bent flat plate structures. However, this structure has significant technical drawbacks: due to the limited surface area of ​​the flat plates, their ability to attract and guide the electric arc is insufficient, resulting in low efficiency in the transfer of the arc to the arc-extinguishing chamber. Specifically, the arc's residence time on the surface of the arc-starting plate is prolonged, preventing it from being quickly guided to the arc-extinguishing area, thus significantly increasing the arc-extinguishing time. This defect not only reduces the breaking performance of the circuit breaker but may also affect the overall reliability and safety of the equipment. Especially in high-voltage or high-current applications, a slow arc-extinguishing process can lead to the accumulation of arc energy, exacerbating equipment wear or causing malfunctions. Utility Model Content

[0004] The purpose of this invention is to provide a circuit breaker with a simple structure that effectively improves the arc initiation and extinguishing effects and shortens the arc extinguishing time.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A circuit breaker, comprising:

[0007] case;

[0008] The contact assembly includes a stationary contact and a moving contact disposed within the housing;

[0009] An arc extinguishing assembly includes an arc extinguishing chamber disposed within the housing and an arc-initiating plate connected to the arc extinguishing chamber. The arc-initiating plate has a protrusion on one side facing the stationary contact, and the protrusion is used to attract the electric arc between the stationary contact and the arc-initiating plate.

[0010] Preferably, the arc-initiating plate includes a first plate segment, a second plate segment, and a third plate segment connected in sequence. The first plate segment is connected to the arc-extinguishing chamber. The second plate segment is bent relative to the first plate segment and extends toward the stationary contact. The third plate segment is bent relative to the second plate segment and extends away from the stationary contact. The protrusion is protruding from the second plate segment.

[0011] Preferably, the protrusions are provided at intervals along the width direction of the second plate segment, and the protrusions extend along the length direction of the second plate segment.

[0012] Preferably, the stationary contact has a through hole and an arc-absorbing plate is provided on the stationary contact, which is attached to the stationary contact and covers the through hole.

[0013] Preferably, the stationary contact has an arc angle, which includes a first contact segment and a second contact segment connected to each other. The second contact segment is bent relative to the first contact segment. The first contact segment is connected to the arc-extinguishing chamber and extends toward the arc-initiating plate. The second contact segment extends away from the arc-initiating plate. The through hole extends from the first contact segment to the second contact segment.

[0014] The arc-absorbing sheet includes a first segment and a second segment connected to each other. The second segment is bent relative to the first segment. The first segment is attached to the first contact segment, and the second segment is attached to the second contact segment. The first segment and the second segment together cover the through hole.

[0015] Preferably, the stationary contact further includes a first curved section disposed between the first contact section and the second contact section, the second contact section being bent relative to the first contact section through the first curved section, and the through hole extending from the first contact section through the first curved section to the second contact section;

[0016] The arc-absorbing sheet further includes a second curved section disposed between the first segment and the second segment. The second segment is bent relative to the first segment through the second curved section. The second curved section is attached to the first curved section, and the first segment, the second curved section and the second segment together cover the through hole.

[0017] Preferably, both the first curved segment and the second curved segment are set as arc segments, and the first curved segment and the second curved segment are set at the same center.

[0018] Preferably, the arc-absorbing piece is located on the side of the stationary contact away from the arc-inducing plate; wherein, the first contact segment, the first bending segment and the second contact segment together form a receiving cavity, and the arc-absorbing piece is embedded in the receiving cavity.

[0019] Preferably, the width of the through hole is set to 1.2mm-1.8mm.

[0020] Preferably, the arc-absorbing sheet is made of copper.

[0021] Beneficial effects:

[0022] The circuit breaker provided by this utility model has a simple structure. The arc-starting plate is provided with a protrusion facing the side where the stationary contact is located. The protrusion increases the surface area of ​​the arc-starting plate and, through the electric field concentration effect, attracts and guides the arc between the stationary contact and the arc-starting plate, enabling the arc to quickly transfer to the arc-extinguishing chamber area, effectively improving the arc-starting and arc-extinguishing effects and shortening the arc-extinguishing time. Attached Figure Description

[0023] Figure 1 A cross-sectional schematic diagram of the circuit breaker provided by this utility model;

[0024] Figure 2 This is a front view of the arc-inducing plate provided by this utility model;

[0025] Figure 3 This is a side view of the structure of the arc-guiding plate provided by this utility model;

[0026] Figure 4 This is a top view of the arc-guiding plate provided by this utility model;

[0027] Figure 5 An exploded view of the stationary contact and the arc angle provided by this utility model;

[0028] Figure 6 A schematic diagram of the structure of the stationary contact provided by this utility model;

[0029] Figure 7 A schematic diagram of the arc angle provided by this utility model.

[0030] In the picture:

[0031] 1. Housing; 11. Stationary contact; 1101. Through hole; 1102. Receiving cavity; 111. First contact section; 112. Second contact section; 113. First bending section; 114. Stationary contact; 12. Moving contact; 121. Moving contact; 13. Arc-absorbing plate; 131. First segment; 132. Second segment; 133. Second bending section;

[0032] 2. Arc-extinguishing chamber;

[0033] 3. Arc-inducing plate; 31. First plate segment; 32. Second plate segment; 321. Protrusion; 33. Third plate segment. Detailed Implementation

[0034] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0035] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0038] This embodiment provides a circuit breaker. (Refer to...) Figures 1 to 7As shown, the circuit breaker includes a housing 1, a contact assembly, and an arc-extinguishing assembly. The contact assembly includes a stationary contact 11 and a moving contact 12 disposed within the housing 1. The arc-extinguishing assembly includes an arc-extinguishing chamber 2 disposed within the housing 1 and an arc-starting plate 3 connected to the arc-extinguishing chamber 2. The arc-starting plate 3 has a protrusion 321 protruding from the side facing the stationary contact 11, and the protrusion 321 is used to attract the electric arc between the stationary contact 11 and the arc-starting plate 3.

[0039] In this embodiment, the circuit breaker has a simple structure. The arc-starting plate 3 is provided with a protrusion 321 facing the side where the stationary contact 11 is located. The protrusion 321 increases the surface area of ​​the arc-starting plate 3 and attracts and guides the arc between the stationary contact 11 and the arc-starting plate 3 through the electric field concentration effect, so that the arc can quickly transfer to the arc-extinguishing chamber 2 area, effectively improving the arc-starting and arc-extinguishing effects and shortening the arc-extinguishing time.

[0040] In this embodiment, the arc-starting plate 3 includes a first plate segment 31, a second plate segment 32, and a third plate segment 33 connected in sequence. The first plate segment 31 is connected to the arc-extinguishing chamber 2. The second plate segment 32 is bent relative to the first plate segment 31 and extends towards the stationary contact 11. The third plate segment 33 is bent relative to the second plate segment 32 and extends away from the stationary contact 11. A protrusion 321 protrudes from the second plate segment 32. Specifically, the second plate segment 32 and the third plate segment 33 extend in opposite directions. Specifically, the second plate segment 32 corresponds to the lower part of the stationary contact 11, therefore the protrusion 321 is correspondingly disposed on the second plate segment 32, effectively shortening the distance between the protrusion 321 and the stationary contact 11, ensuring arc-starting performance.

[0041] Optionally, multiple protrusions 321 are spaced apart along the width direction of the second plate segment 32, and the multiple protrusions 321 extend along the length direction of the second plate segment 32. For example, two protrusions 321 are spaced apart along the width direction of the second plate segment 32, and the two protrusions 321 are symmetrically arranged with respect to the centerline of the length direction of the second plate segment 32. This arrangement ensures uniform and reliable arc-starting performance.

[0042] Specifically, in this embodiment, the stationary contact 11 has a through hole 1101, and an arc-absorbing plate 13 is provided on the stationary contact 11. The arc-absorbing plate 13 is attached to the stationary contact 11 and covers the through hole 1101. Specifically, the arc-absorbing plate 13 built into the arc corner of the stationary contact 11 uses its high electrical conductivity and high thermal conductivity to absorb the electric arc. Together with the through hole 1101, it is used to quickly discharge some of the metal vapor and hot gas generated by the electric arc combustion, effectively shortening the arc extinguishing time.

[0043] Specifically, in this embodiment, the stationary contact 11 has an arc angle, which includes a first contact segment 111 and a second contact segment 112 connected together. The second contact segment 112 is bent relative to the first contact segment 111. The first contact segment 111 is connected to the arc-extinguishing chamber 2 and extends towards the arc-initiating plate 3, while the second contact segment 112 extends away from the arc-initiating plate 3. The through hole 1101 extends from the first contact segment 111 to the second contact segment 112. The arc-absorbing plate 13 includes a first segment 131 and a second segment 132 connected together. The second segment 132 is bent relative to the first segment 131. The first segment 131 is attached to the first contact segment 111, and the second segment 132 is attached to the second contact segment 112. The first segment 131 and the second segment 132 together cover the through hole 1101. Specifically, the bending angle between the first segment 131 and the second segment 132 is the same as the bending angle between the first contact segment 111 and the second contact segment 112. The first segment 131 and the second segment 132 are supported by the first contact segment 111 and the second contact segment 112, so as to achieve full contact between the arc-absorbing plate 13 and the stationary contact 11.

[0044] More specifically, the stationary contact 11 further includes a first curved section 113 disposed between the first contact section 111 and the second contact section 112. The second contact section 112 is bent relative to the first contact section 111 through the first curved section 113. The through hole 1101 extends from the first contact section 111 through the first curved section 113 to the second contact section 112. The arc absorbing plate 13 further includes a second curved section 133 disposed between the first segment 131 and the second segment 132. The second segment 132 is bent relative to the first segment 131 through the second curved section 133. The second curved section 133 fits against the first curved section 113, and the first segment 131, the second curved section 133, and the second segment 132 together cover the through hole 1101. Specifically, the first contact segment 111 and the second contact segment 112 are relatively bent through the first bending segment 113, and the through hole 1101 extends from the first contact segment 111 through the first bending segment 113 to the second contact segment 112. That is, the through hole 1101 is set as a long strip, which ensures the effective length of the through hole 1101 and ensures the effective discharge of metal vapor and hot gas generated by electric arc combustion.

[0045] For example, the first contact segment 111, the first bent segment 113, and the second contact segment 112 are integrally bent and formed. This configuration results in a simple structure and convenient processing.

[0046] For example, the first segment 131, the second curved segment 133, and the second segment 132 are integrally bent and formed. This configuration results in a simple structure and convenient processing.

[0047] More specifically, both the first bending segment 113 and the second bending segment 133 are set as arc segments, and the first bending segment 113 and the second bending segment 133 are arranged concentrically. Specifically, setting both the first bending segment 113 and the second bending segment 133 as arc segments achieves a smooth transition at the bend, ensuring uniform force distribution; on the other hand, when installing the arc-absorbing plate 13, the concentric arrangement of the first bending segment 113 and the second bending segment 133 allows the second bending segment 133 to fit tightly against each other within the first bending segment 113.

[0048] More specifically, the arc-absorbing piece 13 is located on the side of the stationary contact 11 away from the arc-inducing plate 3; wherein, the first contact segment 111, the first bent segment 113, and the second contact segment 112 together form a receiving cavity 1102, and the arc-absorbing piece 13 is embedded in the receiving cavity 1102. Specifically, the arc-absorbing piece 13 is reliably installed in the receiving cavity 1102 as a whole, and the receiving cavity 1102 as a whole effectively supports the arc-absorbing piece 13. The first bent segment 113 and the second bent segment 133 of the arc segment engage with each other, and the first contact segment 111 and the first segment 131 and the second contact segment 112 and the second segment 132 achieve tight contact, so that the arc-absorbing piece 13 and the stationary contact 11 can be reliably installed without the use of external connecting parts such as rivets.

[0049] For example, the arcuate first curved segment 113 and second curved segment 133 are set to have the same curvature.

[0050] Specifically, the first contact segment 111 has a stationary contact 114 on the side facing the moving contact 12, and the moving contact 12 has a corresponding moving contact 121. Electrical conduction is achieved through the contact between the moving contact 12 and the stationary contact 114.

[0051] For example, the width of the through hole 1101 is set to 1.2mm-1.8mm. Specifically, the width of the through hole 1101 can be set to 1.2mm, 1, 5mm, or 1.8mm.

[0052] For example, the arc-absorbing sheet 13 is made of copper, which is inexpensive and has reliable electrical conductivity.

[0053] In this embodiment, the length of the parallel arm segment of the stationary contact 11 is adaptively increased, that is, the length of the first contact segment 111 of the stationary contact 11 is lengthened, and correspondingly the length of the moving contact 12 is lengthened synchronously until the moving contact 12 is lengthened to the point that it does not interfere with the curved portion between the second plate segment 32 and the third plate segment 33 of the arc-starting plate 3. The positions of the stationary contact 114 and the moving contact 121 also move in coordination toward the direction of the arc-starting plate 3. Based on the principle of electro-repulsive force generated by opposite currents, the contact breaking process can be accelerated. When a short circuit occurs, the current will generate an electro-repulsive force between the stationary contact 11 and the moving contact 12. The direction of this repulsive force is consistent with the direction of movement of the moving contact 12, thereby generating an electro-push force to accelerate the contact separation. The magnitude of the electric repulsion force is directly proportional to the intensity of the current. Therefore, when the short-circuit current is large, the effect of the repulsion force is more significant. By lengthening the parallel arm section of the stationary contact 11 and the length of the moving contact 12, the effectiveness of the electric repulsion force is further enhanced, which can significantly shorten the breaking time, thereby accelerating the arc extinguishing process and ensuring that the circuit breaker can protect the electrical system more quickly and effectively.

[0054] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A circuit breaker, characterized in that, include: Shell (1); The contact assembly includes a stationary contact (11) and a moving contact (12) disposed within the housing (1). The arc extinguishing assembly includes an arc extinguishing chamber (2) disposed in the housing (1) and an arc-starting plate (3) connected to the arc extinguishing chamber (2). The arc-starting plate (3) has a protrusion (321) protruding from the side facing the stationary contact (11). The protrusion (321) is used to attract the electric arc between the stationary contact (11) and the arc-starting plate (3).

2. The circuit breaker according to claim 1, characterized in that, The arc-starting plate (3) includes a first plate segment (31), a second plate segment (32) and a third plate segment (33) connected in sequence. The first plate segment (31) is connected to the arc-extinguishing chamber (2). The second plate segment (32) is bent relative to the first plate segment (31) and extends toward the stationary contact (11). The third plate segment (33) is bent relative to the second plate segment (32) and extends away from the stationary contact (11). The protrusion (321) protrudes from the second plate segment (32).

3. The circuit breaker according to claim 2, characterized in that, The protrusions (321) are provided at multiple intervals along the width direction of the second plate segment (32), and the multiple protrusions (321) extend along the length direction of the second plate segment (32).

4. The circuit breaker according to claim 1, characterized in that, The stationary contact (11) has a through hole (1101) and an arc-absorbing plate (13) is provided on the stationary contact (11). The arc-absorbing plate (13) is attached to the stationary contact (11) and covers the through hole (1101).

5. The circuit breaker according to claim 4, characterized in that, The stationary contact (11) has an arc angle, which includes a first contact segment (111) and a second contact segment (112) connected to each other. The second contact segment (112) is bent relative to the first contact segment (111). The first contact segment (111) is connected to the arc-extinguishing chamber (2) and extends toward the arc-inducing plate (3). The second contact segment (112) extends away from the arc-inducing plate (3). The through hole (1101) extends from the first contact segment (111) to the second contact segment (112). The arc-absorbing sheet (13) includes a first segment (131) and a second segment (132) connected to each other. The second segment (132) is bent relative to the first segment (131). The first segment (131) is attached to the first contact segment (111), and the second segment (132) is attached to the second contact segment (112). The first segment (131) and the second segment (132) together cover the through hole (1101).

6. The circuit breaker according to claim 5, characterized in that, The stationary contact (11) further includes a first curved section (113) disposed between the first contact segment (111) and the second contact segment (112). The second contact segment (112) is bent relative to the first contact segment (111) through the first curved section (113). The through hole (1101) extends from the first contact segment (111) through the first curved section (113) to the second contact segment (112). The arc-absorbing plate (13) further includes a second curved section (133) disposed between the first segment (131) and the second segment (132). The second segment (132) is bent relative to the first segment (131) through the second curved section (133). The second curved section (133) fits into the first curved section (113), and the first segment (131), the second curved section (133) and the second segment (132) together cover the through hole (1101).

7. The circuit breaker according to claim 6, characterized in that, Both the first curved segment (113) and the second curved segment (133) are set as arc segments, and the first curved segment (113) and the second curved segment (133) are set at the same center.

8. The circuit breaker according to claim 6, characterized in that, The arc-absorbing plate (13) is located on the side of the stationary contact (11) away from the arc-inducing plate (3); wherein the first contact segment (111), the first bending segment (113) and the second contact segment (112) together form a receiving cavity (1102), and the arc-absorbing plate (13) is embedded in the receiving cavity (1102).

9. The circuit breaker according to claim 4, characterized in that, The width of the through hole (1101) is set to 1.2mm-1.8mm.

10. The circuit breaker according to claim 4, characterized in that, The material of the arc absorbing sheet (13) is set to copper.

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