Arc extinguishing structure and circuit breaker

Abstract

The utility model belongs to the technical field of low-voltage electric appliances, and discloses an arc extinguishing structure and a circuit breaker. The arc extinguishing structure comprises a static cover and a movable cover; wherein the static cover is used for covering the static contact, and a static contact point of the static contact is exposed out of the static cover, so that the moving contact is in contact with the static contact point; the moving cover is rotationally connected to the static cover, and the moving cover is in linkage connection with the moving contact; the moving contact rotates around the first direction to drive the moving cover to rotate around the second direction until the static contact is exposed, and the moving contact of the moving contact is attracted with the static contact. The moving contact rotates around the second direction, the moving contact is separated from the static contact, and the moving cover can be driven to rotate around the first direction to seal the static contact. According to the arc extinguishing structure, the linkage effect between the movable cover and the movable contact is adopted, the arc can be rapidly cut off in a short time through the physical partition arc extinguishing mode of the static cover and the movable cover, the generated arc energy is small, and meanwhile, the large current breaking capacity of the circuit breaker can be effectively improved due to the fact that the space limitation of the arc extinguishing chamber is eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to an arc extinguishing structure and a circuit breaker. Background Art

[0002] The arc extinguishing structure is an important component of the molded case circuit breaker. When the molded case circuit breaker interrupts the fault short-circuit current, an arc will be generated when the moving and static contacts are separated. Therefore, the arc needs to be extinguished by the arc extinguishing structure to ensure the normal performance of the molded case circuit breaker.

[0003] However, since the arc extinguishing structure in the current molded case circuit breaker usually uses air blowing and magnetic blowing to extinguish the arc through a grid-type arc extinguishing chamber, this arc extinguishing method causes the arc burning time to be long and the arc energy generated to be large. At the same time, due to the space limitation of the arc extinguishing chamber, the improvement of the molded case circuit breaker's ability to break large currents is limited.

[0004] Therefore, there is an urgent need for an arc extinguishing structure and a circuit breaker to solve the above problems. Utility Model Content

[0005] The utility model aims to provide an arc extinguishing structure and a circuit breaker, which can quickly cut off the arc generated between the moving and static contacts and effectively break the large current.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Arc extinguishing structure, including:

[0008] A static cover is used to cover the static contact, and the static contact point of the static contact is exposed outside the static cover;

[0009] A dynamic cover, rotatably connected to the static cover, and the dynamic cover is linked to the moving contact;

[0010] The movable contact rotates in a first direction to drive the movable cover to rotate in a second direction until the static contact is exposed, and the movable contact of the movable contact is attracted to the static contact;

[0011] The moving contact rotates around the second direction, the moving contact is separated from the static contact, and can drive the moving cover to rotate around the first direction to seal the static contact, and the first direction is opposite to the second direction.

[0012] As an optional solution, the arc extinguishing structure further includes:

[0013] A connecting rod, one end of which is rotatably connected to the moving cover, and the other end of which is rotatably connected to the moving contact. The connecting rod is used to drive the moving cover to rotate under the drive of the moving contact.

[0014] As an optional solution, a first rotating shaft is provided on the dynamic cover, and one end of the connecting rod is rotatably provided on the first rotating shaft.

[0015] As an optional solution, a second rotating shaft is arranged on the first end of the moving contact having the moving contact point, the other end of the connecting rod is rotatably connected to the second rotating shaft, and the second end of the moving contact is rotatably arranged.

[0016] As an optional solution, the arc extinguishing structure further includes:

[0017] The sealing insulating member is arranged on the static cover, and the dynamic cover can rotate to abut against the sealing insulating member to seal the static contact.

[0018] As an optional solution, the sealing insulating member is elastic.

[0019] As an optional solution, the static cover includes:

[0020] A first part and a second part, the second part is connected to the first part, a placement groove is formed between the first part and the second part, the sealing insulating part is placed in the placement groove, an opening is provided on the second part, the static contact is located at the opening, and the dynamic cover is covered and rotatably connected to the second part.

[0021] As an optional solution, the dynamic hood is an arc-shaped structure, and an arc surface is also provided on the second part. The arc surface is arranged close to the placement groove, and the arc surface matches the arc structure. A third rotating shaft is also provided on the second part, and the dynamic hood is rotatably provided on the third rotating shaft.

[0022] As an optional solution, the static cover is made of nylon.

[0023] A circuit breaker comprises a moving contact, a stationary contact and the arc extinguishing structure as described above, wherein the arc extinguishing structure is used to isolate the arc between the moving contact and the stationary contact.

[0024] Beneficial effects:

[0025] The arc extinguishing structure proposed in the utility model is that a static cover is arranged on the static contact so that the static cover can separate the static contact from the moving contact, and the static contact of the static contact is exposed outside the static cover, so that the moving contact and the static contact are attracted; at the same time, the dynamic cover is rotatably connected to the static cover, and the dynamic cover is linked to the moving contact; when the moving contact rotates around a first direction, it can drive the dynamic cover to rotate around a second direction to expose the static contact, so that the moving contact of the moving contact contacts the static contact, and the attraction between the moving contact and the static contact is realized; when the moving contact rotates around the second direction, it can drive the dynamic cover to rotate around the first direction, and the moving contact The movable cover is separated from the static contact, and the movable cover can rotate around the first direction to seal the static contact. At this time, the movable contact is disconnected from the static contact, so that the movable cover and the static cover can jointly seal the entire static contact, thereby cutting off the conductive circuit between the static contact and the movable contact, so as to effectively cut off the arc between the movable contact and the static contact; the linkage between the movable cover and the moving contact is adopted, and the arc extinguishing method of the physical isolation of the static cover and the movable cover can quickly cut off the arc in a relatively short time, so that the energy of the generated arc is small. At the same time, since the space limitation of the arc extinguishing chamber is eliminated, the large current breaking capacity of the circuit breaker can be effectively improved.

[0026] The circuit breaker proposed in the utility model, because it includes the above-mentioned arc extinguishing structure, can seal the static contact during the process of the moving contact and the static contact breaking the short-circuit current, so as to quickly cut off the arc between the moving contact and the static contact, effectively break the large short-circuit current, and improve the breaking capacity of the entire circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the arc extinguishing structure (opening state) provided by the utility model Figure 1 ;

[0028] Figure 2 It is a structural schematic diagram of the arc extinguishing structure provided by the utility model during the opening process;

[0029] Figure 3 It is a structural schematic diagram of the arc extinguishing structure provided by the utility model during the closing process;

[0030] Figure 4 This is a schematic diagram of the arc extinguishing structure (closed state) provided by the utility model Figure 2 ;

[0031] Figure 5 It is a structural schematic diagram of the dynamic cover provided by the utility model;

[0032] Figure 6 It is a schematic diagram of the assembly structure between the static cover and the static contact provided by the utility model;

[0033] Figure 7 It is a structural schematic diagram of the static cover provided by the utility model.

[0034] In the figure:

[0035] 1. static cover; 11. first part; 12. placement groove; 13. second part; 131. opening; 132. arc surface; 133. third rotating shaft;

[0036] 2. Dynamic cover; 21. First rotating shaft;

[0037] 3. Connecting rod;

[0038] 4. Sealing insulation parts;

[0039] 5. moving contact; 51. moving contact point; 52. second rotating shaft; 53. first end; 54. second end;

[0040] 6. Stationary contact; 61. Stationary contact;

[0041] A. First direction; B. Second direction. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0043] 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, a detachable connection, or an integral 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.

[0044] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is 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 that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0045] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0046] This embodiment proposes an arc extinguishing structure and a circuit breaker including the arc extinguishing structure; wherein, Figure 1 As shown, the circuit breaker further includes a stationary contact 6 and a moving contact 5, and the arc extinguishing structure is used to isolate the arc generated between the stationary contact 6 and the moving contact 5, so as to prevent the arc from continuing to burn and damaging the moving contact 5 and the stationary contact 6, thereby ensuring the breaking performance of the entire circuit breaker; and the arc extinguishing structure can quickly extinguish the arc in a short time, effectively improving the circuit breaker's ability to break short-circuit large currents. In this embodiment, the circuit breaker can specifically be a molded case circuit breaker.

[0047] Specifically, Figures 1 to 4 As shown, the arc extinguishing structure includes a static cover 1 and a dynamic cover 2; wherein, the static cover 1 is used to cover the static contact 6 so that the static cover 1 can isolate the static contact 6 from the moving contact 5; and the static contact 61 of the static contact 6 is exposed outside the static cover 1, so that the moving contact 51 on the moving contact 5 is in direct contact with the static contact 61, that is, only the static contact 61 is exposed on the static cover 1 to contact the moving contact 5; the dynamic cover 2 is covered and rotatably connected to the static cover 1, and the dynamic cover 2 and the moving contact 5 are linked; when the moving contact 5 rotates around the first direction A, it can drive the dynamic cover 2 to rotate around the second direction B until the static contact 61 is exposed, so that the moving contact 5 contacts the static contact 61, and the moving contact 51 is attracted with the static contact 61 to achieve closing; the moving contact 5 rotates around the second direction B, the moving contact 51 is separated from the static contact 61, and it can drive the dynamic cover 2 to rotate around the first direction A to seal the static contact 61 to achieve opening. The first direction A and the second direction B are respectively as follows: Figure 2 and Figure 3 As shown by arrows A and B on the left and right sides of the figure, the first direction A is opposite to the second direction B. The first direction A is counterclockwise, and correspondingly, the second direction B is clockwise.

[0048] Compared with the prior art, the arc extinguishing structure in this embodiment changes the arc extinguishing method and no longer uses the arc extinguishing method of the arc extinguishing chamber; by setting a dynamic cover 2 and a static cover 1 that cooperate with each other, and setting a linkage connection between the dynamic cover 2 and the moving contact 5; Figure 2As shown, when the moving contact 5 rotates around the second direction B, it can drive the moving cover 2 to rotate to seal the static contact 61. At this time, the moving contact 5 is disconnected from the static contact 6, so that the moving cover 2 and the static cover 1 can seal the entire static contact 6 together, thereby cutting off the conductive circuit between the static contact 6 and the moving contact 5, so as to effectively cut off the arc between the moving contact 5 and the static contact 6. Figure 1 As shown; the physical isolation arc extinguishing method of the static cover 1 and the dynamic cover 2 can quickly cut off the arc in a relatively short time, so that the energy of the generated arc is small. At the same time, since the space limitation of the arc extinguishing chamber is eliminated, the arc extinguishing capacity of the arc extinguishing structure is no longer limited by the space of the arc extinguishing chamber, thereby effectively improving the circuit breaker's ability to break large currents.

[0049] Furthermore, if Figures 1 to 4 As shown, the arc extinguishing structure also includes a connecting rod 3, one end of the connecting rod 3 is rotatably connected to the moving cover 2, and the other end of the connecting rod 3 is rotatably connected to the moving contact 5. The connecting rod 3 is used to drive the moving cover 2 to rotate under the drive of the moving contact 5; that is, when the circuit breaker is closed, Figure 3 As shown, the moving contact 5 rotates counterclockwise, so that the moving contact 5 drives the moving cover 2 to rotate clockwise through the connecting rod 3, so that the moving cover 2 can rotate to expose the static contact 61, so that the moving contact 51 contacts the static contact 61, as shown in FIG. Figure 4 As shown; when the circuit breaker is open, Figure 2 As shown, the moving contact 5 rotates in the clockwise direction, so that the moving contact 5 drives the moving cover 2 to rotate in the counterclockwise direction through the connecting rod 3, so that the moving cover 2 can rotate to cover the static contact 61, and the moving cover 2 abuts against the static cover 1, so that the moving cover 2 and the static cover 1 can cooperate with each other to seal the entire static contact 6, so as to cut off the arc between the static contact 6 and the moving contact 5, as shown in FIG. Figure 1 shown.

[0050] The arc extinguishing structure in the present embodiment can achieve rapid arc extinguishing by providing a static cover 1, a dynamic cover 2 and a connecting rod 3. The entire arc extinguishing structure has a simple structure, low cost and is easy to use. In addition, since the dynamic cover 2 and the static cover 1 form a sealing structure together, during the opening process of the circuit breaker, the dynamic cover 2 and the static cover 1 can completely separate the moving contact 5 from the static contact 6, thereby achieving the purpose of directly extinguishing the arc and preventing the arc from reigniting. That is, the arc extinguishing structure in the present embodiment has a more reliable arc extinguishing effect.

[0051] Specifically, Figure 1 and Figure 5As shown, a first rotating shaft 21 is provided on the moving cover 2, and one end of the connecting rod 3 is rotatably provided on the first rotating shaft 21; and a second rotating shaft 52 is provided on the first end 53 of the moving contact 5 having the moving contact point 51, and the other end of the connecting rod 3 is rotatably connected to the second rotating shaft 52, so as to realize the linkage connection between the moving cover 2 and the moving contact 5 through the connecting rod 3. Among them, the second end 54 of the moving contact 5 is rotatably provided, that is, the first end 53 of the moving contact 5 can rotate relative to the second end 54.

[0052] Furthermore, if Figure 1 and Figure 6 As shown, the arc extinguishing structure also includes a sealing insulating member 4, which is arranged on the static cover 1. During the opening process, the dynamic cover 2 can rotate to abut the sealing insulating member 4 to seal the static contact 61. That is, at this time, a sealing cover shell is formed between the static cover 1, the sealing insulating member 4 and the dynamic cover 2, so that the static contact 61 is sealed by the sealing cover shell.

[0053] By providing the sealing insulating part 4, the dynamic cover 2 can be abutted against the sealing insulating part 4. Compared with the dynamic cover 2 directly abutting against the static cover 1, the sealing effect can be better, and the problem of gaps at the abutment between the dynamic cover 2 and the static cover 1 can be avoided, so that the static contact 6 can be sealed more effectively, thereby better cutting off the conductive circuit between the static contact 6 and the dynamic contact 5, more effectively cutting off the arc, and making the arc extinguishing effect more reliable.

[0054] Furthermore, the sealing insulating member 4 is elastic so that the sealing insulating member 4 can provide a buffering effect, so that the dynamic cover 2 can be relatively smoothly abutted against the sealing insulating member 4, thereby avoiding damage to the dynamic cover 2 and avoiding the problem of large noise caused by the abutting action of the dynamic cover 2. In this embodiment, the sealing insulating member 4 is specifically an elastic insulating gasket.

[0055] Specifically, Figure 6 and Figure 7 As shown, the static cover 1 includes a first part 11 and a second part 13, the second part 13 is connected to the first part 11, a placement groove 12 is formed between the first part 11 and the second part 13, the sealing insulating member 4 is placed in the placement groove 12, an opening 131 is provided on the second part 13, the static contact 61 is located at the opening 131, so that the static contact 61 can be exposed outside the static cover 1, and the dynamic cover 2 is covered and rotatably connected to the second part 13. In this embodiment, the first part 11 and the second part 13 are an integrally formed structure.

[0056] Furthermore, if Figure 5 and Figure 7As shown, the dynamic cover 2 is specifically an arc-shaped structure, and an arc surface 132 is also provided on the second part 13. The arc surface 132 is provided close to the placement groove 12, and the arc surface 132 matches the arc structure to prevent the second part 13 of the static cover 1 from interfering with the rotation of the dynamic cover 2, so that the rotation of the dynamic cover 2 is smoother, and the assembly between the second part 13 and the dynamic cover 2 is more compact, so that the entire arc extinguishing structure occupies less space. In other embodiments, the arc surface 132 can also be set as a square surface or other surface-shaped structures, as long as it is ensured that the second part 13 does not interfere with the rotation of the dynamic cover 2, and no specific limitation is made here.

[0057] Specifically, Figure 4 and Figure 7 As shown, a third rotating shaft 133 is also provided on the second part 13, and the dynamic cover 2 is rotatably provided on the third rotating shaft 133, so that the rotating connection structure between the dynamic cover 2 and the static cover 1 is relatively simple, thereby making the structure of the entire arc extinguishing structure simpler.

[0058] Furthermore, the static cover 1 is made of nylon, that is, the static cover 1 is made of high-strength reinforced nylon injection molding, so that the static cover 1 has better supporting strength and wear resistance.

[0059] The specific working process of the arc extinguishing structure in this embodiment is as follows:

[0060] When the circuit breaker is open:

[0061] like Figure 2 As shown in FIG. 1 , when a large short-circuit current is disconnected, the moving contact 5 is pushed open by the electric force, so that the first end 53 of the moving contact 5 rotates clockwise relative to the second end 54, so that the first end 53 of the moving contact 5 drives the connecting rod 3 to move obliquely upward, so that the connecting rod 3 drives the moving cover 2 to rotate counterclockwise, that is, the moving cover 2 rotates in the direction close to the first part 11 of the static cover 1, so that the moving cover 2 can rotate to abut against the sealing insulating member 4. At this time, as shown in FIG. Figure 1 As shown, the moving contact 51 is completely separated from the static contact 61, and the entire static contact 6 is sealed in a sealed cover shell formed by the static cover 1, the sealing insulating part 4 and the moving cover 2, so as to completely and quickly cut off the arc between the moving contact 5 and the static contact 6, thereby realizing the arc extinguishing function during the opening process.

[0062] When the circuit breaker is closed:

[0063] like Figure 3As shown, the first end 53 of the moving contact 5 is rotated counterclockwise relative to the second end 54, so that the first end 53 of the moving contact 5 drives the connecting rod 3 to move obliquely downward, so that the connecting rod 3 drives the moving cover 2 to rotate clockwise, that is, the moving cover 2 rotates in a direction away from the first part 11 of the static cover 1, so that the moving cover 2 can be rotated to be separated from the sealing insulating member 4 and the static contact 61 at the opening 131 is completely exposed, so that the moving contact 51 is completely in contact with the static contact 61, and the circuit breaker is closed, as shown in FIG. Figure 4 shown.

[0064] The arc extinguishing structure in the present embodiment uses the follower of the connecting rod 3 to drive the moving cover 2 to rotate, so that the moving cover 2 seals the static contact 61 when the moving contact 5 is disconnected, thereby ensuring the effective sealing of the static contact 6, thereby being able to cut off the conductive circuit between the moving contact 5 and the static contact 6 to cut off the arc; compared with the current arc extinguishing method of the grid arc extinguishing chamber, the arc extinguishing structure in the present embodiment is simpler and more compact, and can cut off the arc in a shorter time, effectively breaking the short-circuit large current.

[0065] Since the static contact 61 is sealed in the sealed cover formed by the static cover 1, the sealed insulating part 4 and the dynamic cover 2, during the opening process of the circuit breaker, the sealed cover can completely separate the dynamic contact 51 and the static contact 61, thereby achieving the purpose of directly extinguishing the arc and preventing the arc from reigniting, so that the arc extinguishing structure in this embodiment has a better arc extinguishing effect.

[0066] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. Arc extinguishing structure, characterized in that: include: A static cover (1) is used to cover the static contact (6), and the static contact point (61) of the static contact (6) is exposed outside the static cover (1); A dynamic cover (2) is rotatably connected to the static cover (1), and the dynamic cover (2) is linked to the dynamic contact (5); The movable contact (5) rotates in a first direction to drive the movable cover (2) to rotate in a second direction until the static contact (61) is exposed, and the movable contact (51) of the movable contact (5) is attracted to the static contact (61); The moving contact (5) rotates around the second direction, the moving contact (51) is separated from the static contact (61), and can drive the moving cover (2) to rotate around the first direction to seal the static contact (61), the first direction being opposite to the second direction.

2. The arc extinguishing structure according to claim 1, characterized in that: The arc extinguishing structure further comprises: A connecting rod (3) has one end rotatably connected to the moving cover (2) and the other end rotatably connected to the moving contact (5). The connecting rod (3) is used to drive the moving cover (2) to rotate under the drive of the moving contact (5).

3. The arc extinguishing structure according to claim 2, characterized in that: The dynamic cover (2) is provided with a first rotating shaft (21), and one end of the connecting rod (3) is rotatably provided on the first rotating shaft (21).

4. The arc extinguishing structure according to claim 2, characterized in that: The moving contact (5) is provided with a second rotating shaft (52) on the first end (53) of the moving contact (51), the other end of the connecting rod (3) is rotatably connected to the second rotating shaft (52), and the second end (54) of the moving contact (5) is rotatably arranged.

5. The arc extinguishing structure according to any one of claims 1 to 4, characterized in that: The arc extinguishing structure further comprises: A sealing insulating member (4) is arranged on the static cover (1), and the dynamic cover (2) can be rotated to abut against the sealing insulating member (4) to seal the static contact (61).

6. The arc extinguishing structure according to claim 5, characterized in that: The sealing insulating part (4) has elasticity.

7. The arc extinguishing structure according to claim 5, characterized in that: The static cover (1) comprises: A first part (11) and a second part (13), wherein the second part (13) is connected to the first part (11), a placement groove (12) is formed between the first part (11) and the second part (13), the sealing insulating part (4) is placed in the placement groove (12), an opening (131) is provided on the second part (13), the static contact (61) is located at the opening (131), and the dynamic cover (2) is covered and rotatably connected to the second part (13).

8. The arc extinguishing structure according to claim 7, characterized in that: The movable cover (2) is an arc-shaped structure, and the second part (13) is also provided with an arc surface (132), the arc surface (132) is arranged close to the placement groove (12), the arc surface (132) matches the arc structure, and the second part (13) is also provided with a third rotating shaft (133), and the movable cover (2) is rotatably arranged on the third rotating shaft (133).

9. The arc extinguishing structure according to any one of claims 1 to 4, characterized in that: The static cover (1) is made of nylon.

10. A circuit breaker, characterized in that It comprises a moving contact (5), a stationary contact (6) and an arc extinguishing structure as claimed in any one of claims 1 to 9, wherein the arc extinguishing structure is used to isolate the arc between the moving contact (5) and the stationary contact (6).

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