Circuit breaker

Abstract

The utility model belongs to the technical field of low-voltage electric appliances, and discloses a circuit breaker which comprises a shell, a movable contact knife, a static contact seat, a static arc striking assembly and a gas blocking assembly. A contact support is arranged in the shell, and the movable contact knife is rotationally connected with the contact support; and the movable contact knife is provided with a movable arc striking contact and a movable contact which are distributed at an interval. The static contact seat is installed on the housing, and the static contact seat is provided with a static contact. The static arc striking assembly is arranged on the static contact seat, and the static arc striking assembly is provided with a static arc striking contact. The gas blocking assembly comprises a gas blocking plate and an elastic piece, one end of the gas blocking plate is located between the static arc striking contact and the static contact and rotationally connected with the static arc striking assembly, and the elastic piece exerts elastic acting force on the gas blocking plate so that the other end of the gas blocking plate can abut against the movable contact knife all the time till the electric arc is extinguished. When the moving contact knife moves, the gas baffle plate always abuts against the moving contact knife, so that the gas baffle plate can effectively prevent an electric arc from moving towards the moving contact and the static contact, the moving contact and the static contact are prevented from being broken down, the structure is simple, and cost reduction is facilitated.

Description

Technical Field

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

[0002] Circuit breakers are a crucial component of power distribution networks. When overload or short-circuit faults occur in the network, the overload or short-circuit current flowing through the circuit breaker triggers the moving contact to actuate under the action of the actuator. When the moving contact separates from the stationary and moving arc-starting contacts, an electric arc is generated between them due to the lag in their separation. This arc, a metallic gaseous vapor, diffuses and moves towards the moving and stationary contacts, potentially damaging them.

[0003] In existing technologies, a partition is typically used to block the arc and prevent it from spreading towards the moving and stationary contacts. The partition is typically a telescopic plate, mounted on the contact support via a rotating linkage structure. When the contact support drives the moving contact blade to rotate, the rotating linkage structure and the moving contact blade move accordingly, driving the partition to extend or retract, thus blocking the arc. This design is relatively complex, difficult to assemble and debug, and not conducive to cost reduction. Utility Model Content

[0004] The purpose of this utility model is to provide a circuit breaker that can effectively block electric arcs by setting an air baffle plate to elastically abut against the moving contact blade, thereby effectively preventing electric arcs from puncturing the moving and stationary contacts. The structure is simple and the cost is low.

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

[0006] Circuit breakers, including:

[0007] The moving contact knife is equipped with spaced-apart moving arc-inducing contacts and moving contacts;

[0008] A stationary contact base is provided with a stationary contact that can contact the moving contact;

[0009] A stationary arc-starting assembly is disposed on the stationary contact seat, and the stationary arc-starting assembly is provided with a stationary arc-starting contact that can contact the moving arc-starting contact.

[0010] An air baffle assembly includes an air baffle plate and an elastic element. One end of the air baffle plate is located between the stationary arc-starting contact and the stationary contact, and is rotatably connected to the stationary arc-starting assembly. The elastic element is used to apply an elastic force to the air baffle plate so that the other end of the air baffle plate abuts against the portion of the moving contact blade located between the moving arc-starting contact and the moving contact.

[0011] As an optional embodiment, the static arc-starting assembly includes:

[0012] A stationary arc-starting base is disposed on the stationary contact base, and the stationary arc-starting contact is disposed on the stationary arc-starting base;

[0013] An air baffle base is connected to the static arc-drawing base and extends toward the moving contact blade. One end of the air baffle plate is rotatably connected to the air baffle base, and the air baffle base is provided with a clearance notch to avoid the moving contact blade.

[0014] As an alternative, the air baffle base is provided with a connecting lug, and one end of the air baffle plate is rotatably connected to the connecting lug via a first connecting shaft.

[0015] As an alternative, the elastic element is a torsion spring, which is sleeved on the first connecting shaft, with one end of the torsion spring elastically abutting against the connecting lug and the other end of the torsion spring elastically abutting against the air baffle.

[0016] As an optional solution, the air-blocking base includes an extension plate and a connecting corner plate. The extension plate has a folded edge at one end near the stationary contact seat, and the connecting corner plate is located at the end of the folded edge away from the extension plate. The connecting corner plate is used to connect with the stationary arc-drawing base, and the clearance notch passes through the extension plate and the folded edge.

[0017] The connecting lug is disposed on the folded edge, and the air baffle, under the elastic action of the elastic member, can abut against the folded edge on both sides along the axial direction of the first connecting shaft.

[0018] As an alternative, along the axial direction of the first connecting shaft, the width of the baffle is smaller than the width of the clearance notch;

[0019] The air baffle is provided with protrusions on both sides along the axial direction of the first connecting shaft, and the protrusions can abut against the folded edge.

[0020] As an optional embodiment, the static arc-starting assembly includes:

[0021] A stationary arc-starting base is disposed on the stationary contact base, and the stationary arc-starting contact is disposed on the stationary arc-starting base;

[0022] An arc-blocking plate is disposed on the static arc-inducing base. The arc-blocking plate is provided with an arc-blocking notch. The static arc-inducing contact is located in the arc-blocking notch. One end of the air baffle plate is rotatably connected to the arc-blocking plate.

[0023] As an alternative, the arc-blocking plate has a rotating groove at one end near the stationary contact seat, and one end of the baffle plate is rotatably connected to the rotating groove via a second connecting shaft.

[0024] As an alternative, the groove wall of the rotating channel is provided with a connecting opening, and the air baffle is inserted into the connecting opening. When the air baffle rotates under the elastic force of the elastic member, it can abut against the inner side of the connecting opening.

[0025] As an alternative, the other end of the baffle plate, on the side that contacts the moving contact blade, is provided with a protrusion or a chamfered surface.

[0026] The beneficial effects of this utility model are:

[0027] The circuit breaker provided by this utility model has an air baffle plate located between the stationary arc-starting contact and the stationary contact at one end, and the other end of the air baffle plate abutting against the portion of the moving contact located between the moving arc-starting contact and the moving contact under the elastic force of the elastic element. When the moving contact moves, the air baffle plate always abuts against the moving contact, so that the air baffle plate can effectively block the arc from moving towards the moving contact and the stationary contact, preventing the moving contact and the stationary contact from being broken down. The structure is simple and helps to reduce costs. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the circuit breaker provided in Embodiment 1 of this utility model;

[0029] Figure 2 yes Figure 1 Enlarged view of the structure at point A in the middle;

[0030] Figure 3 This is a schematic diagram of the air-blocking component according to Embodiment 1 of this utility model;

[0031] Figure 4 This is a schematic diagram of the air-blocking base according to Embodiment 1 of this utility model;

[0032] Figure 5 This is a schematic diagram of the structure of the air baffle and static arc-starting assembly involved in Embodiment 1 of this utility model;

[0033] Figure 6 This is a schematic diagram of the air baffle plate according to Embodiment 1 of this utility model;

[0034] Figure 7 This is a schematic diagram of the arc-blocking plate involved in Embodiment 2 of this utility model;

[0035] Figure 8 This is a schematic diagram of the structure of the baffle plate involved in Embodiment 2 of this utility model;

[0036] Figure 9 This is a schematic diagram of the structure of the air baffle and the static arc-starting assembly involved in Embodiment 2 of this utility model.

[0037] In the picture:

[0038] 1. Shell;

[0039] 2. Contact support;

[0040] 3. Moving contact knife; 31. Moving arc-initiating contact; 32. Moving contact;

[0041] 4. Static contact seat; 41. Static contact head;

[0042] 5. Static arc-starting assembly; 51. Static arc-starting base; 511. Static arc-starting contact; 52. Air-blocking base; 521. Extension plate; 522. Connecting corner plate; 523. Folded edge; 524. Clearance notch; 525. Connecting lug; 5251. Support plate; 5252. Lug; 53. Arc-blocking plate; 531. Arc-blocking notch; 532. Rotary groove; 5321. Connecting port;

[0043] 6. Air baffle assembly; 61. Air baffle plate; 611. Protrusion; 612. Raised portion; 613. Through hole; 614. Reinforcing rib; 615. Chamfered surface; 62. Elastic element; 63. First connecting shaft. Detailed Implementation

[0044] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0045] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0048] Example 1

[0049] like Figures 1-6 As shown, this utility model embodiment provides a circuit breaker, which includes a housing 1, a moving contact 3, a stationary contact base 4, a stationary arc-starting assembly 5, and an air-blocking assembly 6.

[0050] The housing 1 contains a contact support 2, and a moving contact blade 3 is rotatably connected to the contact support 2. The moving contact blade 3 is provided with spaced-apart moving arc-inducing contacts 31 and moving contacts 32. A stationary contact seat 4 is mounted on the housing 1 and is provided with a stationary contact 41. A stationary arc-inducing assembly 5 is disposed on the stationary contact seat 4 and is provided with a stationary arc-inducing contact 511. An air-blocking assembly 6 includes an air-blocking plate 61 and an elastic element 62. One end of the air-blocking plate 61 is located between the stationary arc-inducing contact 511 and the stationary contact 41 and is rotatably connected to the stationary arc-inducing assembly 5.

[0051] When the circuit breaker is closed, the moving contact 32 and the stationary contact 41 are in reliable contact, while the moving arc-starting contact 31 and the stationary arc-starting contact 511 are in a separated state. Under the elastic force applied by the elastic element 62, the baffle plate 61 abuts against the part of the moving contact 3 located between the moving arc-starting contact 31 and the moving contact 32. When an overload current or a short-circuit current flows through the circuit breaker, the contact support 2 drives the moving contact 3 to start operating. When the moving contact 3 moves to the first position, the moving contact 32 and the stationary contact 41 separate, and the moving arc-starting contact 31 and the stationary arc-starting contact 511 make contact. At this time, no obvious arc is generated. When the moving contact 3 continues to move to the second position, the moving arc-starting contact 31 and the stationary arc-starting contact 511 separate, and an arc is generated.

[0052] During the movement of the aforementioned moving contact 3, the elastic element 62 applies an elastic force to the baffle plate 61 so that the baffle plate 61 always has a force that rotates in the direction of the moving contact 3. Therefore, when the moving contact 3 is in motion, the other end of the baffle plate 61 always abuts against the moving contact 3 until the arc is extinguished.

[0053] Since one end of the baffle plate 61 is located between the stationary arc-inducing contact 511 and the stationary contact 41, and the other end of the baffle plate 61 abuts against the part of the moving contact 3 located between the moving arc-inducing contact 31 and the moving contact 32 under the elastic force of the elastic member 62, and the baffle plate 61 always abuts against the moving contact 3 when the moving contact 3 moves, the baffle plate 61 can effectively block the arc from moving towards the moving contact 32 and the stationary contact 41, preventing the moving contact 32 and the stationary contact 41 from being broken down. The structure is simple and conducive to cost reduction.

[0054] Optionally, such as Figures 2-5As shown, the static arc-starting assembly 5 includes a static arc-starting base 51 and a gas-blocking base 52. The static arc-starting base 51 is disposed on the static contact seat 4, and the static arc-starting contact 511 is disposed on the static arc-starting base 51. The gas-blocking base 52 is connected to the static arc-starting base 51 and extends toward the moving contact 3. One end of the gas-blocking plate 61 is rotatably connected to the gas-blocking base 52, and the gas-blocking base 52 is provided with a clearance notch 524, through which the moving contact 3 passes. In this structure, the gas-blocking base 52 extends toward the moving contact 3, and the moving contact 3 is located at the clearance notch 524, so that the gas-blocking base 52 can be disposed above the contact support 2 to separate the housing 1 and prevent the arc from moving toward the contact support 2.

[0055] Furthermore, the static arc-starting assembly 5 also includes an arc-blocking plate 53, which is disposed on the static arc-starting base 51 and has an arc-blocking notch 531. The static arc-starting contact 511 is connected to the static arc-starting base 51 and located within the arc-blocking notch 531. This structure can effectively prevent the electric arc from burning other components.

[0056] Optionally, the air baffle base 52 is provided with a connecting lug 525, and one end of the air baffle 61 is rotatably connected to the connecting lug 525 via a first connecting shaft 63. Specifically, the connecting lug 525 includes a support plate 5251 and two lugs 5252 spaced apart on the support plate 5251 along the axial direction of the first connecting shaft 63. The lugs 5252 are provided with connecting holes, and the end of the air baffle 61 connected to the first connecting shaft 63 is provided with a through hole 613. The first connecting shaft 63 passes through both the through hole 613 and the connecting holes of the two lugs 5252, so that the air baffle 61 can rotate.

[0057] Specifically, the baffle plate 61 includes an extension plate 521 and a connecting corner plate 522. The extension plate 521 has a folded edge 523 at one end near the stationary contact seat 4. The connecting corner plate 522 is located at the end of the folded edge 523 away from the extension plate 521. Two connecting corner plates 522 can be provided. Both connecting corner plates 522 are connected to the stationary arc-drawing base 51. The clearance notch 524 passes through the extension plate 521 and the folded edge 523. The support plate 5251 of the connecting ear seat 525 is connected to the folded edge 523, and the support plate 5251 is located between the two connecting corner plates 522. The ear plate 5252 is fixedly mounted on the support plate 5251 and fixedly connected to the folded edge 523. Under the elastic force of the elastic member 62, the baffle plate 61 rotates toward the extension plate 521 and abuts against the moving contact knife 3. As the moving contact knife 3 moves away from the stationary contact seat 4, the baffle plate 61 can abut against the folded edge 523 on both sides along the axial direction of the first connecting shaft 63 to limit the rotation angle of the baffle plate 61.

[0058] Optionally, the elastic element 62 is a torsion spring, which is sleeved on the first connecting shaft 63. One end of the torsion spring elastically abuts against the support plate 5251 of the connecting lug 525, and the other end of the torsion spring elastically abuts against the side of the air baffle 61 opposite to the extension plate 521. In this structure, the torsion spring is simple and easy to install and use.

[0059] Optionally, the baffle plate 61 has protrusions 611 on both sides along the axial direction of the first connecting shaft 63. Along the axial direction of the first connecting shaft 63, the width of the baffle plate 61 is smaller than the width of the clearance notch 524. The centerline of the baffle plate 61 can coincide with the centerline of the clearance notch 524, so that the baffle plate 61 is centrally located. Of course, the baffle plate 61 can also be non-centrally located, as long as the vertical projection of the baffle plate 61 on the extension plate 521 is within the clearance notch 524. When the moving contact 3 moves away from the stationary contact seat 4, the protrusions 611 on both sides of the baffle plate 61 can abut against the folded edge 523. In this structure, the height of the protrusions 611 can be set according to the actual required rotation angle of the baffle plate 61, so that when the protrusions 611 abut against the folded edge 523, the baffle plate 61 has a sufficient rotation angle to ensure that the moving contact 32 and the stationary contact 41 are completely unaffected by the electric arc.

[0060] Optionally, such as Figure 6 As shown, a protrusion 612 is provided on the other end of the baffle plate 61 facing the moving contact knife 3. The protrusion 612 can contact the moving contact knife 3. By providing the protrusion 612 in this structure, the structural strength of the baffle plate 61 is higher, wear is reduced, and the service life of the baffle plate 61 can be improved.

[0061] Optionally, the baffle plate 61 is provided with a plurality of spaced reinforcing ribs 614 along its width direction, which can effectively improve the structure of the baffle plate 61.

[0062] Example 2

[0063] like Figures 7-9 As shown, the circuit breaker provided in this embodiment does not include the gas-blocking base 52 of Embodiment 1. One end of the gas-blocking plate 61 is rotatably connected to the arc-blocking plate 53. The arc-blocking plate 53 in this embodiment has a basically the same structure as the arc-blocking plate 53 in Embodiment 1, except that the arc-blocking plate 53 has a rotating groove 532 at the end near the stationary contact seat 4, and one end of the gas-blocking plate 61 is rotatably connected via a second connecting shaft. This structure simplifies the structure by rotatably connecting the gas-blocking plate 61 to the rotating groove 532 of the arc-blocking plate 53 via the second connecting shaft, effectively reducing the cost of the circuit breaker.

[0064] Optionally, the rotating groove 532 is an open groove with its opening facing the stationary contact seat 4. The baffle plate 61 is inserted into the connecting port 5321. When the moving contact knife 3 moves away from the stationary contact seat 4, the baffle plate 61 can abut against the inner side of the connecting port 5321 when it rotates under the elastic force of the elastic member 62, so as to limit the rotation angle of the baffle plate 61.

[0065] Optionally, the elastic element 62 can also be a torsion spring, which is sleeved on the second connecting shaft, with one end of the torsion spring elastically abutting against the rotating groove 532 and the other end elastically abutting against the air baffle 61.

[0066] Optionally, the other end of the baffle plate 61 is provided with a chamfered surface 615 facing the moving contact knife 3. The chamfered surface 615 abuts against the moving contact knife 3, which can increase the contact area with the baffle plate 61, reduce wear, and improve the service life of the baffle plate 61.

[0067] 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: The moving contact (3) is provided with spaced moving arc-inducing contacts (31) and moving contacts (32); The stationary contact base (4) is provided with a stationary contact (41) that can contact the moving contact (32); A stationary arc-starting assembly (5) is disposed on the stationary contact seat (4), and the stationary arc-starting assembly (5) is provided with a stationary arc-starting contact (511) that can contact the moving arc-starting contact (31); The gas baffle assembly (6) includes a gas baffle plate (61) and an elastic member (62). One end of the gas baffle plate (61) is located between the stationary arc-drawing contact (511) and the stationary contact (41) and is rotatably connected to the stationary arc-drawing assembly (5). The elastic member (62) is used to apply an elastic force to the gas baffle plate (61) so that the other end of the gas baffle plate (61) abuts against the portion of the moving contact blade (3) located between the moving arc-drawing contact (31) and the moving contact (32).

2. The circuit breaker according to claim 1, characterized in that, The static arc-starting assembly (5) includes: A static arc-drawing base (51) is disposed on the static contact base (4), and a static arc-drawing contact (511) is disposed on the static arc-drawing base (51). The air baffle base (52) is connected to the static arc-drawing base (51) and extends toward the moving contact knife (3). One end of the air baffle plate (61) is rotatably connected to the air baffle base (52), and the air baffle base (52) is provided with a clearance notch (524) to avoid the moving contact knife (3).

3. The circuit breaker according to claim 2, characterized in that, The air baffle base (52) is provided with a connecting ear (525), and one end of the air baffle plate (61) is rotatably connected to the connecting ear (525) through a first connecting shaft (63).

4. The circuit breaker according to claim 3, characterized in that, The elastic element (62) is configured as a torsion spring, which is sleeved on the first connecting shaft (63). One end of the torsion spring elastically abuts against the connecting lug (525), and the other end of the torsion spring elastically abuts against the air baffle (61).

5. The circuit breaker according to claim 3, characterized in that, The air-blocking base (52) includes an extension plate (521) and a connecting corner plate (522). The extension plate (521) has a folded edge (523) at one end near the stationary contact base (4). The connecting corner plate (522) is located at the end of the folded edge (523) away from the extension plate (521). The connecting corner plate (522) is used to connect with the stationary arc-drawing base (51). The clearance notch (524) passes through the extension plate (521) and the folded edge (523). The connecting ear (525) is disposed on the folded edge (523), and the air baffle (61) under the elastic action of the elastic member (62) can abut against the folded edge (523) on both sides along the axial direction of the first connecting shaft (63).

6. The circuit breaker according to claim 5, characterized in that, Along the axial direction of the first connecting shaft (63), the width of the baffle plate (61) is smaller than the width of the clearance notch (524); The air baffle (61) has protrusions (611) on both sides along the axial direction of the first connecting shaft (63), and the protrusions (611) can abut against the folded edge (523).

7. The circuit breaker according to claim 1, characterized in that, The static arc-starting assembly (5) includes: A static arc-drawing base (51) is disposed on the static contact base (4), and a static arc-drawing contact (511) is disposed on the static arc-drawing base (51). An arc-blocking plate (53) is disposed on the static arc-inducing base (51). The arc-blocking plate (53) is provided with an arc-blocking notch (531). The static arc-inducing contact (511) is located inside the arc-blocking notch (531). One end of the air baffle plate (61) is rotatably connected to the arc-blocking plate (53).

8. The circuit breaker according to claim 7, characterized in that, The arc-blocking plate (53) has a rotating groove (532) at one end near the stationary contact seat (4), and one end of the air baffle plate (61) is rotatably connected to the rotating groove (532) through a second connecting shaft.

9. The circuit breaker according to claim 8, characterized in that, The groove (532) has a connecting opening (5321) on its groove wall. The baffle plate (61) passes through the connecting opening (5321). When the baffle plate (61) rotates under the elastic force of the elastic member (62), it can abut against the inner side of the connecting opening (5321).

10. The circuit breaker according to any one of claims 1-9, characterized in that, The other end of the baffle plate (61) and the side in contact with the moving contact blade (3) is provided with a protrusion (612) or a chamfered surface (615).

Images