Circuit breaker

Abstract

The invention 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] The invention relates to the technical field of low-voltage electrical appliances, and in particular to a circuit breaker. Background Art

[0002] Circuit breakers are an important part of the power distribution network. When a current overload or short circuit occurs in the power distribution network, the overload current or short circuit current flows through the circuit breaker. Under the action of the actuator, the moving contact starts to move. When the moving contact moves to separate the moving arc contact from the static arc contact and the moving contact from the static contact, an arc is generated between the moving arc contact and the static arc contact due to the hysteresis of the separation of the moving arc contact and the static arc contact. The arc is a metallic gaseous vapor, which will diffuse and move toward the moving and static contacts and damage them.

[0003] In the prior art, a partition is generally used to block the arc to prevent the arc from spreading toward the moving and static contacts. The partition is set as a telescopic plate and is set on the contact support through a rotating connecting rod structure. When the contact support drives the moving contact blade to rotate, the rotating connecting rod structure and the moving contact blade follow and drive the partition to extend or retract to achieve the function of blocking the arc. This structural design is relatively complex, and the difficulty of assembly and debugging is high, which is not conducive to reducing costs. Summary of the invention

[0004] The object of the present invention is to provide a circuit breaker which can effectively block the arc and prevent the arc from penetrating the moving contact and the stationary contact by arranging an air baffle to elastically abut the moving contact blade, and has a simple structure and low cost.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] Circuit breakers, including:

[0007] The moving contact knife is provided with a moving arcing contact and a moving contact which are spaced apart;

[0008] A stationary contact seat is provided with a stationary contact capable of contacting the moving contact;

[0009] A 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 capable of contacting the moving arc-striking contact;

[0010] The air baffle assembly includes an air baffle plate and an elastic member, one end of the air baffle plate is located between the static arc-striking contact and the static contact, and is rotatably connected to the static arc-striking assembly, and the elastic member 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 part of the moving contact knife located between the moving arc-striking contact and the moving contact.

[0011] As an optional solution, the static arc striking assembly includes:

[0012] A static arc-striking base is arranged on the static contact base, and the static arc-striking contact is arranged on the static arc-striking base;

[0013] The air blocking base is connected to the static arc-striking base and extends toward the moving contact knife. One end of the air blocking plate is rotatably connected to the air blocking base, and the air blocking base is provided with an avoidance gap for avoiding the moving contact knife.

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

[0015] As an optional solution, the elastic member is configured as a torsion spring, which is sleeved on the first connecting shaft, and one end of the torsion spring elastically abuts against the connecting ear seat, and the other end of the torsion spring elastically abuts against the air baffle.

[0016] As an optional solution, the air blocking base includes an extension plate and a connecting angle plate, the extension plate is provided with a folded edge at one end close to the static contact seat, the connecting angle plate is provided at one end of the folded edge away from the extension plate, the connecting angle plate is used to be connected to the static arc striking base, and the avoidance notch passes through the extension plate and the folded edge;

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

[0018] As an optional solution, along the axial direction of the first connecting shaft, the width dimension of the air baffle is smaller than the width dimension of the avoidance gap;

[0019] The air baffle plate 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 solution, the static arc striking assembly includes:

[0021] A static arc-striking base is arranged on the static contact base, and the static arc-striking contact is arranged on the static arc-striking base;

[0022] An arc-isolating plate is arranged on the static arc-striking base, the arc-isolating plate is provided with an arc-isolating notch, the static arc-striking contact is located in the arc-isolating notch, and one end of the air baffle is rotatably connected to the arc-isolating plate.

[0023] As an optional solution, a rotation groove is provided at one end of the arc isolation plate close to the static contact seat, and one end of the air baffle plate is rotatably connected to the rotation groove via a second connecting shaft.

[0024] As an optional solution, a connecting opening is provided on the groove wall of the rotating groove, and the air baffle plate is penetrated in the connecting opening. When the air baffle plate rotates under the elastic force of the elastic member, it can abut against the inner side surface of the connecting opening.

[0025] As an optional solution, a raised portion or a chamfered surface is provided on the other end of the air baffle and on the side in contact with the movable contact knife.

[0026] Beneficial effects of the present invention:

[0027] The circuit breaker provided by the present invention has one end of an air baffle plate located between a static arc-striking contact and a static contact, and the other end of the air baffle plate abuts against a portion of a moving contact knife located between the moving arc-striking contact and the moving contact under the elastic force of an elastic member, and when the moving contact knife moves, the air baffle plate always abuts against the moving contact knife, so that the air baffle plate can effectively block the arc from moving in the direction of the moving contact and the static contact, thereby preventing the moving contact and the static contact from being penetrated, and has a simple structure, which is conducive to cost reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic structural diagram of a circuit breaker provided in Embodiment 1 of the present invention;

[0029] Figure 2 yes Figure 1 A magnified view of the structure at center A;

[0030] Figure 3 is a structural schematic diagram of an air baffle assembly involved in Embodiment 1 of the present invention;

[0031] Figure 4 is a schematic structural diagram of an air blocking base involved in Embodiment 1 of the present invention;

[0032] Figure 5 1 is a schematic structural diagram of an air baffle and a static arc striking assembly involved in Embodiment 1 of the present invention;

[0033] Figure 6 is a schematic structural diagram of an air baffle involved in Embodiment 1 of the present invention;

[0034] Figure 7 is a schematic structural diagram of an arc isolation plate involved in the second embodiment of the present invention;

[0035] Figure 8 is a schematic structural diagram of an air baffle involved in Embodiment 2 of the present invention;

[0036] Fig. 9 It is a schematic structural diagram of the air baffle and static arc striking assembly involved in the second embodiment of the present invention.

[0037] In the figure:

[0038] 1. Shell;

[0039] 2. Contact support;

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

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

[0042] 5. Static arc-striking assembly; 51. Static arc-striking base; 511. Static arc-striking contact; 52. Air-blocking base; 521. Extension plate; 522. Connecting angle plate; 523. Folding edge; 524. Avoidance gap; 525. Connecting ear seat; 5251. Support plate; 5252. Ear plate; 53. Arc-isolating plate; 531. Arc-isolating gap; 532. Rotating 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 member; 63. First connecting shaft. DETAILED DESCRIPTION

[0044] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar parts or parts having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0045] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, it can be a mechanical connection or an electrical connection, it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the description of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0047] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0048] Embodiment 1

[0049] like Figure 1-Figure 6 As shown, an embodiment of the present invention provides a circuit breaker, which includes a housing 1, a moving contact blade 3, a stationary contact seat 4, a stationary arc-striking assembly 5 and an air blocking assembly 6.

[0050] Among them, a contact support 2 is arranged in the housing 1, and a moving contact blade 3 is rotatably connected to the contact support 2; the moving contact blade 3 is provided with a moving arc-striking contact 31 and a moving contact 32 which are spaced apart. A stationary contact seat 4 is mounted on the housing 1, and the stationary contact seat 4 is provided with a stationary contact 41. A stationary arc-striking assembly 5 is arranged on the stationary contact seat 4, and the stationary arc-striking assembly 5 is provided with a stationary arc-striking contact 511. The air baffle assembly 6 includes an air baffle plate 61 and an elastic member 62, one end of the air baffle plate 61 is located between the stationary arc-striking contact 511 and the stationary contact 41, and is rotatably connected to the stationary arc-striking assembly 5.

[0051] When the circuit breaker is closed, the moving contact 32 and the static contact 41 are in reliable contact, the moving arc-striking contact 31 and the static arc-striking contact 511 are in a separated state, and the air baffle 61 is under the elastic force applied by the elastic member 62 so that the other end of the air baffle 61 abuts against the part of the moving contact blade 3 located between the moving arc-striking 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 blade 3 to start moving, and when the moving contact blade 3 moves to the first position, the moving contact 32 and the static contact 41 are separated, and the moving arc-striking contact 31 and the static arc-striking contact 511 are in contact, and no obvious arc is generated at this time. When the moving contact blade 3 continues to move to the second position, the moving arc-striking contact 31 and the static arc-striking contact 511 are separated, and an arc is generated at this time.

[0052] During the movement of the movable contact knife 3, the elastic member 62 applies an elastic force to the air baffle plate 61 so that the air baffle plate 61 always has a force to rotate toward the movable contact knife 3. Therefore, when the movable contact knife 3 moves, the other end of the air baffle plate 61 always abuts against the movable contact knife 3 until the arc is extinguished.

[0053] Since one end of the air baffle 61 is located between the static arc-striking contact 511 and the static contact 41, the other end of the air baffle 61 abuts against the part of the moving contact knife 3 located between the moving arc-striking contact 31 and the moving contact 32 under the elastic force of the elastic member 62, and when the moving contact knife 3 moves, the air baffle 61 always abuts against the moving contact knife 3, so that the air baffle 61 can effectively block the arc from moving in the direction of the moving contact 32 and the static contact 41 to prevent the moving contact 32 and the static contact 41 from being penetrated. The structure is simple, which is conducive to cost reduction.

[0054] Alternatively, if Figure 2-Figure 5As shown, the static arc-striking assembly 5 includes a static arc-striking base 51 and an air-blocking base 52, wherein the static arc-striking base 51 is arranged on the static contact base 4, and the static arc-striking contact 511 is arranged on the static arc-striking base 51; the air-blocking base 52 is connected to the static arc-striking base 51 and extends toward the movable contact blade 3, one end of the air-blocking plate 61 is rotatably connected to the air-blocking base 52, and the air-blocking base 52 is provided with an avoidance notch 524, and the movable contact blade 3 is inserted into the avoidance notch 524. In this structure, the air-blocking base 52 extends toward the movable contact blade 3, and the movable contact blade 3 is located in the avoidance notch 524, so that the air-blocking base 52 can be arranged 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-striking assembly 5 also includes an arc-striking plate 53, which is arranged on the static arc-striking base 51, and the arc-striking plate 53 is provided with an arc-striking notch 531. The static arc-striking contact 511 is connected to the static arc-striking base 51 and is located in the arc-striking 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 ear seat 525, and one end of the air baffle plate 61 is rotatably connected to the connecting ear seat 525 via a first connecting shaft 63. Specifically, the connecting ear seat 525 includes a support plate 5251 and two ear plates 5252 arranged on the support plate 5251 at intervals along the axial direction of the first connecting shaft 63, the ear plates 5252 are provided with connecting holes, and one end of the air baffle plate 61 connected to the first connecting shaft 63 is provided with a through hole 613, and the first connecting shaft 63 is simultaneously penetrated in the through hole 613 and the connecting holes of the two ear plates 5252, so that the air baffle plate 61 can rotate.

[0057] Specifically, the air baffle plate 61 includes an extension plate 521 and a connecting angle plate 522. The extension plate 521 is provided with a folded edge 523 at one end close to the static contact seat 4. The connecting angle plate 522 is arranged at the end of the folded edge 523 away from the extension plate 521. Two connecting angle plates 522 can be provided. Both connecting angle plates 522 are connected to the static arc-starting base 51. The avoidance 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 angle plates 522, and the ear plate 5252 is fixedly arranged on the support plate 5251 and fixedly connected to the folded edge 523. Under the elastic force of the elastic member 62, the air baffle plate 61 rotates toward the extension plate 521 and abuts against the movable contact knife 3. When the movable contact knife 3 moves away from the stationary contact seat 4, the air 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 air baffle plate 61.

[0058] Optionally, the elastic member 62 is configured as a torsion spring, which is sleeved on the first connecting shaft 63, and one end of the torsion spring elastically abuts against the support plate 5251 of the connecting ear seat 525, and the other end of the torsion spring elastically abuts against the side of the air baffle 61 away from the extension plate 521. In this structure, the torsion spring has a simple structure and is easy to install and use.

[0059] Optionally, the air baffle 61 is provided with protrusions 611 on both sides of the axial direction of the first connecting shaft 63; along the axial direction of the first connecting shaft 63, the width dimension of the air baffle 61 is smaller than the width dimension of the avoidance notch 524, and the center line of the air baffle 61 can coincide with the center line of the avoidance notch 524, so that the air baffle 61 is centrally distributed. Of course, the air baffle 61 may not be centrally distributed, but it is sufficient that the vertical projection of the air baffle 61 on the extension plate 521 is located within the avoidance notch 524; when the moving contact blade 3 moves away from the static contact seat 4, the protrusions 611 on both sides of the air baffle 61 can abut against the folded edge 523. In this structure, the height dimension of the protrusion 611 can be set according to the actual required rotation angle of the air baffle 61, so that when the protrusion 611 abuts against the folded edge 523, the air baffle 61 has a sufficient rotation angle to ensure that the moving contact 32 and the static contact 41 are completely unaffected by the arc.

[0060] Alternatively, if Figure 6 As shown, a protrusion 612 is provided on the other end of the air baffle plate 61 facing the moving contact knife 3, and the protrusion 612 can contact the moving contact knife 3. In this structure, by providing the protrusion 612, the structural strength of the air baffle plate 61 is higher, the wear is reduced, and the service life of the air baffle plate 61 can be increased.

[0061] Optionally, the air baffle plate 61 is provided with a plurality of reinforcing ribs 614 distributed at intervals along the width direction thereof, which can effectively improve the structure of the air baffle plate 61 .

[0062] Embodiment 2

[0063] like Figure 7-Figure 9 As shown, a circuit breaker provided by an embodiment of the present invention does not include the air blocking base 52 in the first embodiment, and one end of the air blocking plate 61 is rotatably connected to the arc isolation plate 53. The arc isolation plate 53 in this embodiment has a substantially same structure as the arc isolation plate 53 in the first embodiment, except that a rotation groove 532 is provided at one end of the arc isolation plate 53 close to the stationary contact seat 4, and one end of the air blocking plate 61 is rotatably connected via a second connecting shaft. The air blocking plate 61 of this structure is rotatably connected to the rotation groove 532 of the arc isolation plate 53 via the second connecting shaft, making the structure simpler, and the air blocking base 52 in the first embodiment can be eliminated, effectively reducing the cost of the circuit breaker.

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

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

[0066] Optionally, a chamfered surface 615 is provided on the other end of the air baffle plate 61 facing the movable contact knife 3. The chamfered surface 615 abuts against the movable contact knife 3, thereby increasing the contact area with the air baffle plate 61, reducing wear and tear, and improving the service life of the air baffle plate 61.

[0067] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled 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 list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A circuit breaker, characterized in that include: The movable contact blade (3) is provided with a movable arc-striking contact (31) and a movable contact (32) which are spaced apart; A stationary contact seat (4) provided with a stationary contact (41) capable of contacting the moving contact (32); A static arc-striking assembly (5) is arranged on the static contact seat (4), and the static arc-striking assembly (5) is provided with a static arc-striking contact (511) capable of contacting the moving arc-striking contact (31); The air baffle assembly (6) comprises an air baffle plate (61) and an elastic member (62), wherein one end of the air baffle plate (61) is located between the static arc-striking contact (511) and the static contact (41), and is rotatably connected to the static arc-striking assembly (5), and the elastic member (62) is used to apply an elastic force to the air baffle plate (61) so that the other end of the air baffle plate (61) abuts against a portion of the moving contact knife (3) located between the moving arc-striking contact (31) and the moving contact (32).

2. The circuit breaker according to claim 1, characterized in that: The static arc striking assembly (5) comprises: A static arc-striking base (51) is arranged on the static contact base (4), and the static arc-striking contact (511) is arranged on the static arc-striking base (51); The air blocking base (52) is connected to the static arc striking base (51) and extends toward the movable contact knife (3); one end of the air blocking plate (61) is rotatably connected to the air blocking base (52), and the air blocking base (52) is provided with an avoidance notch (524) for avoiding the movable 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 seat (525), and one end of the air baffle plate (61) is rotatably connected to the connecting ear seat (525) via a first connecting shaft (63).

4. The circuit breaker according to claim 3, characterized in that: The elastic member (62) is configured as a torsion spring, which is sleeved on the first connecting shaft (63), and one end of the torsion spring elastically abuts against the connecting ear seat (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) comprises an extension plate (521) and a connecting angle plate (522); the extension plate (521) is provided with a folded edge (523) at one end close to the static contact seat (4); the connecting angle plate (522) is provided at one end of the folded edge (523) away from the extension plate (521); the connecting angle plate (522) is used to be connected to the static arc striking base (51); the avoidance notch (524) passes through the extension plate (521) and the folded edge (523); The connecting ear seat (525) is arranged on the folded edge (523), and under the elastic action of the elastic member (62), the air baffle plate (61) 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 dimension of the air baffle plate (61) is smaller than the width dimension of the avoidance gap (524); The air baffle plate (61) is provided with 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 striking assembly (5) comprises: A static arc-striking base (51) is arranged on the static contact base (4), and the static arc-striking contact (511) is arranged on the static arc-striking base (51); An arc isolation plate (53) is arranged on the static arc striking base (51), the arc isolation plate (53) is provided with an arc isolation notch (531), the static arc striking contact (511) is located in the arc isolation notch (531), and one end of the air baffle plate (61) is rotatably connected to the arc isolation plate (53).

8. The circuit breaker according to claim 7, characterized in that: A rotation groove (532) is provided at one end of the arc isolation plate (53) close to the stationary contact seat (4), and one end of the air baffle plate (61) is rotationally connected to the rotation groove (532) via a second connecting shaft.

9. The circuit breaker according to claim 8, characterized in that The groove wall of the rotating groove (532) is provided with a connecting opening (5321), and the air baffle plate (61) is inserted into the connecting opening (5321). When the air baffle plate (61) rotates under the elastic force of the elastic member (62), it can abut against the inner side surface of the connecting opening (5321).

10. The circuit breaker according to any one of claims 1 to 9, characterized in that: A protrusion (612) or a chamfered surface (615) is provided at the other end of the air baffle (61) and at the side in contact with the movable contact knife (3).

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