A circuit breaker

Abstract

The present invention provides a circuit breaker, which includes a leakage tripping mechanism, a short-circuit tripping mechanism and an operating mechanism. The operating mechanism is located on one side of the static contact of the short-circuit tripping mechanism, and the leakage tripping mechanism is located on the side of the short-circuit tripping mechanism far from the static contact. An actuator is provided between the leakage tripping mechanism and the operating mechanism, and the leakage tripping mechanism cooperates with the operating mechanism through the actuator. In this way, the voltage coil of the leakage tripping mechanism will not be affected by the arc, and the structural arrangement is reasonable. The leakage tripping mechanism and the short-circuit tripping mechanism are arranged side by side left and right, with a compact structure and no impact on the height of the circuit breaker, enabling the size of the short-circuit coil in the short-circuit tripping mechanism to be set larger, and the maximum frame rating of the circuit breaker can reach 63A, facilitating the expansion of the circuit breaker.

Description

Technical Field

[0001] The present invention relates to the technical field of differential protection, and particularly relates to a circuit breaker. Background Art

[0002] Leakage protection circuit breakers are widely used in industrial, commercial, and residential areas. When there is leakage, overload, or short circuit in the circuit, the leakage protection circuit breaker can quickly cut off the faulty power within a specified extremely short time to protect the safety of people and electrical equipment.

[0003] The leakage protection circuit breaker includes a leakage tripping mechanism and a short - circuit tripping mechanism. In the prior art, the leakage tripping mechanism and the short - circuit tripping mechanism are usually arranged in a row. In this setting, the leakage tripping mechanism and the short - circuit tripping mechanism will affect each other during operation, making the leakage protection circuit breaker may have inaccurate operation. There is also a leakage protection circuit breaker, such as a multifunctional leakage circuit breaker with a width of 18 mm without lengthening disclosed in Chinese Patent Document CN102760622A. In this circuit breaker, the leakage tripping mechanism is arranged in the cavity under the static contact and the moving contact. In this setting, the leakage tripping mechanism and the short - circuit tripping mechanism will not affect each other during operation. However, when the moving contact and the static contact are separated due to a short circuit, an arc will be generated, and the arc will damage the leakage tripping mechanism, especially the voltage coil in the leakage tripping mechanism. The setting positions of the leakage tripping mechanism and the short - circuit tripping mechanism are unreasonable; in addition, the circuit board of the leakage tripping component is arranged below the short - circuit tripping mechanism. Due to the dimensional limitation of the height of the circuit breaker housing, the size of the short - circuit coil cannot be set very large. And the short - circuit coil is part of the current - carrying component during the normal operation of the circuit breaker, that is, the capacity increase of the circuit breaker is limited. The maximum frame rating of this circuit breaker is only 40 A; moreover, the leakage tripping mechanism in this circuit breaker trips the tripping mechanism through a lever, and the circuit breaker needs to provide a rotation space for the lever, making the structure inside the circuit breaker not compact enough. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art that the leakage tripping mechanism and the short - circuit tripping mechanism in the leakage tripping mechanism are unreasonably arranged, the structure is not compact enough, and the maximum frame rating is small, so as to provide a circuit breaker with reasonable structure among various mechanisms, compact structure, and large maximum frame rating.

[0005] To this end, the present invention provides a circuit breaker, including a leakage tripping mechanism, a short - circuit tripping mechanism, and an operating mechanism. The operating mechanism is located on the side of the static contact of the short - circuit tripping mechanism, the leakage tripping mechanism is located on the side away from the static contact of the short - circuit tripping mechanism, and an actuator is arranged between the leakage tripping mechanism and the operating mechanism. The leakage tripping mechanism cooperates with the operating mechanism through the actuator.

[0006] The operating mechanism is located on the upper right side of the short - circuit tripping mechanism, the leakage tripping mechanism is located on the upper left side of the short - circuit tripping mechanism, and the actuator straddles the upper part of the short - circuit tripping mechanism.

[0007] The actuator is movably mounted on the housing, and has a first driving part and a second driving part respectively disposed at both ends thereof, and a third driving part that drives the actuator to reset under the opening force of the operating mechanism. Wherein, the first driving part is driven by the leakage tripping mechanism to drive the second driving part to trip the circuit breaker.

[0008] The third driving part and the second driving part are respectively located on the upper and lower sides of the actuator. The third driving part is disposed opposite to the contact support of the operating mechanism, and the second driving part is disposed opposite to the latch of the operating mechanism.

[0009] The actuator is connected to the housing through a guiding and limiting structure. The guiding and limiting structure includes a limiting hole provided on one of the housing and the actuator, and a convex shaft provided on the other of the housing and the actuator and adapted to extend into the limiting hole to limit the moving trajectory of the actuator.

[0010] The guiding and limiting structure further includes a sliding groove formed on the housing for the reciprocating movement of the first driving part.

[0011] The limiting hole is an elongated hole, and the setting directions of the limiting hole and the sliding groove are parallel to the setting direction of the short - circuit tripping mechanism.

[0012] It further includes a leakage test assembly adapted to drive the leakage tripping mechanism to act. The leakage test assembly includes a conductive part and a moving contact part. The conductive part is disposed on the housing and electrically connected to the circuit board; the moving contact part is electrically connected to the circuit board. The moving contact part is linked with the test button. When the moving contact part moves, it contacts or disconnects from the conductive part. When the moving contact part contacts the conductive part, the leakage test circuit where the moving contact part is located is turned on, and the leakage tripping mechanism performs a tripping action.

[0013] The conductive part is the yoke of the short - circuit tripping mechanism, and the yoke is electrically connected to the circuit board through a wire.

[0014] A first connecting part connected to the moving contact part is provided on the circuit board, and an elastic connecting part adapted to be connected with the first connecting part is provided on the moving contact part.

[0015] The first connecting part is a copper column.

[0016] The moving contact member includes a fulcrum portion located in the middle thereof, and an elastic connection portion and an elastic cooperation portion respectively disposed at both ends of the fulcrum portion. The fulcrum portion abuts against a support block on the housing. The elastic cooperation portion can abut against the test button to elastically deform and contact the conductive member. When the elastic cooperation portion resets, it pushes the test button back to the initial position.

[0017] The technical solution of the present invention has the following advantages:

[0018] 1. For the circuit breaker provided by the present invention, the operating mechanism is located on the static contact side of the short-circuit tripping mechanism, and the leakage tripping mechanism is arranged on the side of the short-circuit tripping mechanism far from the static contact. The leakage tripping mechanism cooperates with the operating mechanism through an actuator. In this way, the voltage coil of the leakage tripping mechanism will not be affected by the arc, and the structure is reasonably arranged. The leakage tripping mechanism and the short-circuit tripping mechanism are arranged side by side left and right, with a compact structure and no impact on the height of the circuit breaker. This enables the size of the short-circuit coil in the short-circuit tripping mechanism to be set larger, and the maximum frame rating of the circuit breaker can reach 63A, facilitating the expansion of the circuit breaker.

[0019] 2. For the circuit breaker provided by the present invention, the leakage tripping mechanism is located at the upper left side of the short-circuit tripping mechanism, and the actuator straddles above the short-circuit tripping mechanism. In this way, the structure is more compact, and due to the small height of the actuator, the size of the short-circuit coil in the short-circuit tripping mechanism can be set larger, facilitating the expansion of the circuit breaker.

[0020] 3. For the circuit breaker provided by the present invention, the actuator is movably installed on the housing, and has a first driving portion and a second driving portion respectively disposed at both ends thereof, and a third driving portion that drives the actuator to reset under the opening force of the operating mechanism. The third driving portion is disposed opposite to the contact support of the operating mechanism, and the second driving portion is disposed opposite to the latch of the operating mechanism. When a leakage occurs, the leakage tripping mechanism operates to drive the actuator to move. The second driving portion drives the latch and the trip of the operating mechanism to unlock, and the contact support drives the moving contact to separate from the static contact, causing the circuit breaker to trip. At the same time as the contact support trips, it cooperates with the third driving portion of the actuator to drive the actuator to reset. Since the reset of the actuator is achieved by means of the action of the contact support, the setting of the reset spring is omitted, the structure is simpler, the assembly is quick and convenient, and the production cost is reduced.

[0021] 4. For the circuit breaker provided by the present invention, the actuator is connected to the housing through a guiding and limiting structure. The guiding and limiting structure includes a limiting hole provided on one of the housing and the actuator, and a convex shaft provided on the other of the housing and the actuator and adapted to extend into the limiting hole to limit the moving trajectory of the actuator. The mutually cooperating limiting hole and convex shaft have the advantage of simple structure.

[0022] 5. The circuit breaker provided by the present invention comprises a conductive part and a moving contact. When the moving contact contacts the conductive part, the leakage test circuit where the moving contact is located is turned on. The inventor cleverly utilizes the existing conductive part of the circuit breaker to cooperate with the moving contact. Compared with the prior art method of setting a static spring sheet, the structure is simpler, the assembly is quick and convenient, and the production cost is reduced.

[0023] 6. In the circuit breaker provided by the present invention, a first connecting piece connected to the moving contact is arranged on the circuit board, the first connecting piece is a copper column, and an elastic connecting part adapted to be connected to the copper column is provided on the moving contact. Since the elastic connecting part of the moving contact is connected to the copper column in a plug-in manner, the assembly is quick and convenient, and at the same time, the connecting wires between the moving contact and the circuit board are eliminated, further reducing the production cost.

[0024] 7. In the circuit breaker provided by the present invention, the moving contact comprises a fulcrum portion located in the middle thereof, and an elastic connecting portion and an elastic matching portion respectively arranged at both ends of the fulcrum portion. When the elastic matching portion is reset, the test button is pushed to return to its initial position, that is, the test button is reset with the aid of the elastic force of the elastic matching portion of the moving contact itself, thereby eliminating the need to install a reset spring for driving the test button to reset, further reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 is a front view of the circuit breaker of the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of the execution part;

[0028] Figure 3 is a three-dimensional diagram of a circuit breaker;

[0029] Figure 4 for Figure 3 A schematic diagram of the enlarged structure of part A;

[0030] Figure 5 for Figure 1 The schematic diagram of the structure after removing the leakage tripping mechanism and the actuator;

[0031] Figure 6 for Figure 5 A schematic diagram of the enlarged structure of part B;

[0032] Figure 7Schematic structural diagram of the test button and the moving contact

[0033] Figure 8 Schematic structural diagram of the yoke and the short - circuit coil

[0034] Figure 9 Exploded structural diagram of the yoke and the short - circuit coil

[0035] Figure 10 Schematic structural diagram of the housing

[0036] Explanation of reference numerals: 1. Short - circuit tripping mechanism; 11. Short - circuit release; 12. Second transmission member; 13. Yoke; 14. Short - circuit coil; 2. Operating mechanism; 21. Contact support; 22. Lock; 23. Trip; 3. Leakage tripping mechanism; 4. Executing member; 41. First driving part; 42. Second driving part; 43. Third driving part; 44. Limit hole; 5. Housing; 51. Convex shaft; 52. Support block; 53. Slide groove; 6. Conductive member; 61. Wire; 7. Circuit board; 71. Copper post; 8. Moving contact; 80. Fulcrum part; 81. Elastic connection part; 82. Elastic matching part; 9. Test button. Detailed implementation manners

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

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

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

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

[0041] Embodiment

[0042] This embodiment provides a circuit breaker, as Figure 1 shown, including an operating mechanism 2, a short-circuit tripping mechanism 1, a leakage tripping mechanism, and a leakage test assembly.

[0043] The operating mechanism 2 is located on the static contact side of the short-circuit tripping mechanism 1, and includes a contact bracket 21, a latch 22, and a trip 23. The moving contact is arranged on the contact bracket 21 and is linked with the contact bracket 21.

[0044] The short-circuit tripping mechanism 1 includes a short-circuit release 11 and a second transmission member 12 for driving the circuit breaker to trip. The second transmission member 12 is disposed opposite to the latch 22 and cooperates with it.

[0045] The leakage tripping mechanism is located on the side of the short-circuit tripping mechanism 1 away from the static contact. An actuator 4 is provided between the leakage tripping mechanism and the operating mechanism 2. The leakage tripping mechanism cooperates with the operating mechanism 2 through the actuator 4. In this embodiment, the operating mechanism 2 is located on the upper right side of the short-circuit tripping mechanism 1, the leakage tripping mechanism is located on the upper left side of the short-circuit tripping mechanism 1, and the actuator straddles above the short-circuit tripping mechanism 1.

[0046] The actuator 4 is movably mounted on the housing 5, as Figure 2 and 3 shown, having a first driving portion 41 and a second driving portion 42 provided at both ends thereof, and a third driving portion 43 for driving the actuator 4 to reset under the tripping force of the operating mechanism 2. The third driving portion 43 and the second driving portion 42 are respectively located on the upper and lower sides of the actuator 4. Among them, the first driving portion 41 is driven by the leakage tripping mechanism 3 to drive the second driving portion 42 to trip the circuit breaker. The third driving portion 43 is disposed opposite to the contact bracket 21 of the operating mechanism 2, and the second driving portion 42 is disposed opposite to the latch 22 of the operating mechanism 2. The actuator 4 is connected to the housing 5 through a guiding and limiting structure. The guiding and limiting structure includes a limiting hole 44 provided on the actuator 4 and a convex shaft 51 provided on the housing 5 and adapted to extend into the limiting hole 44 to limit the moving trajectory of the actuator 4, as Figure 10As shown, the guiding and limiting structure further includes a sliding groove 53 formed on the housing 5 for the reciprocating movement of the first driving portion 41. The limiting hole 44 is an elongated hole. The setting directions of the limiting hole 44 and the sliding groove 53 are parallel to the setting direction of the short-circuit tripping mechanism 1. In this embodiment, the first driving portion 41 is cylindrical, and the sliding groove 53 is an arc-shaped structure adapted thereto.

[0047] The leakage test assembly, such as Figure 3 and 4 as shown, includes a conductive member 6 and a moving contact member 8.

[0048] The conductive member 6 is disposed on the housing 5 and is electrically connected to the circuit board 7. In this embodiment, as Figure 5 , shown in 8, 9, the conductive member 6 is the yoke 13 of the short-circuit tripping mechanism 1, and the yoke is electrically connected to the circuit board 7 through a wire 61.

[0049] The moving contact member 8, as Figure 5-7 shown, includes a fulcrum portion 80 at the middle thereof, and an elastic connection portion 81 and an elastic mating portion 82 respectively disposed at both ends of the fulcrum portion 80. The fulcrum portion 80 abuts against the support block 52 on the housing 5. The elastic connection portion 81 is adaptively connected to the first connecting member provided on the circuit board 7. In this embodiment, the first connecting member is a copper column 71. The elastic mating portion 82 can abut against the test button 9 to elastically deform and contact the conductive member 6. When the elastic mating portion 82 is reset, it pushes the test button 9 back to the initial position.

[0050] As an alternative embodiment, the guiding and limiting structure includes a limiting hole provided on the housing 5, and a convex shaft on the actuator 4 adapted to extend into the limiting hole to limit the movement track of the actuator 4.

[0051] As an alternative embodiment, the guiding and limiting structure includes a sliding groove formed on the housing 5, and a slider formed on the actuator 4 that slidably cooperates with the sliding groove.

[0052] As an alternative embodiment, the conductive member 6 can also be the short-circuit coil 14 of the short-circuit tripping mechanism 1.

[0053] For the circuit breaker of the present invention, the operating mechanism 2 is located on the static contact side of the short-circuit tripping mechanism 1, and the leakage tripping mechanism is arranged on the side of the short-circuit tripping mechanism 1 away from the static contact. The leakage tripping mechanism cooperates with the operating mechanism 2 through the actuator 4, so that the voltage coil of the leakage tripping mechanism will not be affected by the arc, and the structure is reasonably arranged. The leakage tripping mechanism and the short-circuit tripping mechanism 1 are arranged side by side left and right, which is not only compact in structure, but also does not affect the height of the circuit breaker, enabling the size of the short-circuit coil in the short-circuit tripping mechanism 1 to be set larger, and the maximum frame rating of the circuit breaker can reach 63A, facilitating the expansion of the circuit breaker.

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

Claims

1. A circuit breaker, comprising a leakage tripping mechanism (3), a short - circuit tripping mechanism (1) and an operating mechanism (2), characterized in that, The operating mechanism (2) is located on one side of the static contact of the short-circuit tripping mechanism (1); the leakage tripping mechanism (3) is located on a side of the short-circuit tripping mechanism (1) away from the static contact; an actuator (4) is provided between the leakage tripping mechanism (3) and the operating mechanism (2); the leakage tripping mechanism (3) cooperates with the operating mechanism (2) via the actuator (4); The actuator (4) is movably mounted on the housing (5), and comprises a first driving portion (41) and a second driving portion (42) respectively arranged at two ends thereof, and a third driving portion (43) for driving the actuator (4) to reset under the opening force of the operating mechanism (2); The first driving part (41) is driven by the leakage tripping mechanism (3) to drive the second driving part (42) to drive the circuit breaker to open; The third driving part (43) and the second driving part (42) are respectively located on the upper and lower sides of the actuator (4); the third driving part (43) is arranged opposite to the contact support (21) of the operating mechanism (2); and the second driving part (42) is arranged opposite to the lock (22) of the operating mechanism (2).

2. The circuit breaker according to claim 1, characterized in that, The operating mechanism (2) is located on the upper right side of the short-circuit tripping mechanism (1), the leakage tripping mechanism (3) is located on the upper left side of the short-circuit tripping mechanism (1), and the actuator spans above the short-circuit tripping mechanism (1).

3. The circuit breaker according to claim 2, characterized in that, The actuator (4) is connected to the housing (5) via a guide and limit structure, the guide and limit structure comprising a limit hole (44) provided on one of the housing (5) and the actuator (4), and a convex shaft (51) provided on the other of the housing (5) and the actuator (4) and adapted to extend into the limit hole (44) and limit the moving trajectory of the actuator (4).

4. The circuit breaker according to claim 3, characterized in that, The guide and limiting structure further comprises a slide groove (53) formed on the housing (5) and for allowing the first driving part (41) to reciprocate.

5. The circuit breaker according to claim 4, characterized in that, The limiting hole (44) is a long hole, and the setting direction of the limiting hole (44) and the sliding groove (53) is parallel to the setting direction of the short-circuit tripping mechanism (1).

6. The circuit breaker according to any one of claims 1 - 5, characterized in that, It also includes a leakage test component suitable for driving the leakage tripping mechanism (3) to operate, and the leakage test component includes: A conductive member (6) is disposed on the housing (5) and is electrically connected to the circuit board (7); A moving contact (8) is electrically connected to the circuit board (7). The moving contact (8) is linked to a test button (9). When the moving contact (8) is in motion, it contacts or disconnects from the conductive member (6). When the moving contact (8) contacts the conductive member (6), the leakage test circuit where the moving contact (8) is located is connected, and the leakage tripping mechanism (3) is tripped.

7. The circuit breaker according to claim 6, characterized in that, The conductive member (6) is a magnetic yoke (13) of the short-circuit tripping mechanism (1), and the magnetic yoke (13) is electrically connected to the circuit board (7) via a wire (61).

8. The circuit breaker according to claim 7, characterized in that, The circuit board (7) is provided with a first connecting piece connected to the moving contact (8), and the moving contact (8) is provided with an elastic connecting portion (81) adapted to be connected to the first connecting piece.

9. The circuit breaker according to claim 8, characterized in that, The first connecting member is a copper column (71).

10. The circuit breaker according to claim 9, characterized in that, The moving contact (8) includes a fulcrum portion (80) at its middle, and elastic connecting portions (81) and elastic mating portions (82) respectively disposed at both ends of the fulcrum portion (80). The fulcrum portion (80) abuts against a support block (52) on the housing (5). The elastic mating portion (82) can abut against the test button (9) to elastically deform and contact the conductive member (6). When the elastic mating portion (82) resets, it pushes the test button (9) back to its initial position.

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