circuit breaker

Abstract

The application discloses a circuit breaker and belongs to the electrical field. The circuit breaker comprises a shell, an operation module and a function module. The operation module comprises a handle, a transmission member, a contact support, a tripping member and an elastic assembly. The function module comprises a moving contact and a stationary contact. The handle, the contact support and the tripping member are respectively hinged to the shell. The first end of the transmission member is hinged to the handle. The second end of the transmission member is movably connected to the contact support. The moving contact is fixed to the contact support. When the circuit breaker is closed, the handle drives the contact support and the tripping member to rotate through the transmission member. The contact support drives the moving contact to contact the stationary contact. The second end of the transmission member is locked to the contact support in the closed state. When the circuit breaker is opened, the tripping member performs a tripping action to drive the second end of the transmission member to be unlocked from the contact support. The handle, the contact support and the tripping member are reset under the action of the elastic assembly. The circuit breaker has the advantages of less components, simple structure, high operation reliability, simple preparation process and low manufacturing cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the electrical field, in particular to a circuit breaker. BACKGROUND

[0002] The circuit breaker is a circuit protection device, which is usually used to cut off and connect a load circuit and cut off a fault circuit, and the circuit breaker realizes the breaking control of the circuit through an operating mechanism.

[0003] In the related art, the operating mechanism of the circuit breaker includes a handle, a contact support, a tripping piece, a trip, a lever, a transmission piece and other components, the trip is hinged to the lever and connected to the handle through the transmission piece. In the closed state of the circuit breaker, the tripping piece is engaged with the trip, and when the circuit breaker is opened, the tripping piece is disengaged from the trip to realize tripping.

[0004] However, the circuit breaker provided in the related art has a large number of components, which makes the structure complex and reduces the reliability of the circuit breaker. SUMMARY

[0005] In view of this, the present application provides a circuit breaker which can solve the above technical problems.

[0006] Specifically, the technical scheme includes the following:

[0007] A circuit breaker, comprising a housing, an operating module and a functional module, wherein the operating module comprises a handle, a transmission piece, a contact support, a tripping piece and an elastic assembly, and the functional module comprises a movable contact and a stationary contact;

[0008] The handle, the contact support and the tripping piece are respectively hinged to the housing, the first end of the transmission piece is hinged to the handle, the second end of the transmission piece is movably connected to the contact support, and the movable contact is fixedly connected to the contact support;

[0009] The circuit breaker is configured to, when the circuit breaker is closed, the handle drives the contact support and the tripping piece to rotate through the transmission piece, the contact support in turn drives the movable contact to contact the stationary contact to realize closing, and the second end of the transmission piece is locked to the contact support in the closed state;

[0010] When the circuit breaker is opened, the tripping piece performs a tripping action to drive the second end of the transmission piece to be unlocked from the contact support, and then the handle, the contact support and the tripping piece are reset under the action of the elastic assembly.

[0011] In some possible implementations, the elastic assembly comprises a first elastic piece, a second elastic piece and a third elastic piece.

[0012] The first elastic member is located between the handle and the shell and is configured to reset the handle;

[0013] The second elastic member comprises a spring body, a first elastic arm and a second elastic arm; the first elastic arm and the second elastic arm are respectively connected with two ends of the spring body and extend to the same side of the spring body; the spring body is connected with the tripping member; the first elastic arm abuts against the contact support; the second elastic arm is connected with the second end of the transmission member so that the second end of the transmission member always abuts against the contact support;

[0014] The third elastic member is located between the contact support and the shell and is configured to reset the contact support.

[0015] In some possible implementation manners, the contact support comprises a support body part, a movable connection part, a fixed connection part and a first abutting part;

[0016] The support body part is hinged with the rotating shaft arranged on the shell;

[0017] The movable connection part and the first abutting part are both connected with the first end of the support body part, and the movable connection part is further movably connected with the second end of the transmission member; the first abutting part further abuts against the first elastic arm of the second elastic member;

[0018] The fixed connection part is connected with the second end of the support body part, and the fixed connection part is further fixedly connected with one end of the movable contact.

[0019] In some possible implementation manners, the support body part comprises a receiving cavity, and the tripping member comprises a tripping body part, a tripping driving part and a rotating center part;

[0020] The tripping body part has a surrounding cavity, and the tripping body part is arranged outside the contact support through the surrounding cavity;

[0021] The tripping driving part is connected with the first end of the tripping body part, and the tripping driving part extends into the receiving cavity to drive the second end of the transmission member;

[0022] The rotating center part is connected with the inner side wall of the tripping body part, and the rotating center part extends into the receiving cavity and is hinged with the rotating shaft.

[0023] In some possible implementation manners, a first connection hole is arranged on each of the walls of the support body part located on two sides of the receiving cavity;

[0024] A second connection hole is arranged on the rotating center part;

[0025] The first connecting hole and the second connecting hole are in communication and are both hinged to the rotating shaft.

[0026] In some possible implementations, the first connecting hole is a waist-shaped hole, and the first connecting hole is configured to allow the contact support to rotate in sequence with the rotating shaft and the contact surface of the movable contact and the fixed contact as a rotating fulcrum.

[0027] In some possible implementations, the movable connecting part is in a groove shape, is arranged at a first end of a wall of the support main body part on two sides of the accommodating cavity, and is capable of locking the second end of the transmission part in a closed state of the circuit breaker.

[0028] The movable connecting part has a force applying groove wall configured to always abut against the second end of the transmission part.

[0029] In some possible implementations, the fixed connecting part has a jack hole coinciding with a central axis of the accommodating cavity, and the jack hole is fixedly connected with one end of the movable contact.

[0030] In some possible implementations, the first abutting part is arranged at a first end of an outer side wall of the support main body part on a first side of the accommodating cavity.

[0031] The contact support further comprises a second abutting part arranged at an outer side wall of the support main body part on a second side of the accommodating cavity, and the second abutting part further abuts against one torsion arm of the third elastic part.

[0032] In some possible implementations, the contact support further comprises a first stop part connected to a first end of the support main body part.

[0033] In a state of opening of the circuit breaker, the first stop part is used to abut against a stop block arranged on the shell.

[0034] In some possible implementations, the contact support further comprises a guide part connected to a second end of the support main body part.

[0035] The guide part is used to slide fit with a guide structure arranged on the shell, so that the contact support rotates according to a set rotating track.

[0036] In some possible implementations, the tripping part further comprises a second stop part connected to an inner side wall of the tripping main body part.

[0037] In a state of opening of the circuit breaker, the second stop part is used to abut against the fixed connecting part.

[0038] In the closed state of the circuit breaker, the tripping driving part is in abutting position with the second end of the transmission part.

[0039] In some possible implementation manners, the tripping part further comprises a first trigger part and a second trigger part, the first trigger part is connected to the second end of the tripping main body part, and the second trigger part is connected to the outer side wall of the tripping main body part between the first end and the second end of the tripping main body part.

[0040] The function module further comprises a short-circuit protection part and an overload protection part, the short-circuit protection part is configured to, when the circuit breaker is in a short-circuit state, push the first trigger part, so that the tripping part performs a tripping action, and the overload protection part is configured to, when the circuit breaker is in an overload state, push the second trigger part, so that the tripping part performs a tripping action.

[0041] In some possible implementation manners, the second elastic arm is sleeved on the part of the second end of the transmission part inside the accommodating cavity.

[0042] In some possible implementation manners, the transmission part comprises a first connecting segment, a transition segment and a second connecting segment connected in sequence, and the first connecting segment and the second connecting segment are located on the same side of the transition segment.

[0043] The first connecting segment is hinged to the handle, and the second connecting segment is movably connected to the contact support.

[0044] In some possible implementation manners, the second connecting segment is a non-cylindrical rod body.

[0045] The technical scheme provided by the embodiment of the application has at least the following beneficial effects:

[0046] The circuit breaker provided by the embodiment of the present application is characterized in that the handle, the transmission member, the contact bracket and the movable contact are sequentially connected, so that when the circuit breaker is closed, the rotating force of the handle can be directly transmitted to the contact bracket through the transmission member to drive the contact bracket to rotate, and the rotating contact bracket drives the movable contact to move to approach the static contact until the two contacts are in contact, so that the function module is powered and the circuit breaker is closed. In the closed state of the circuit breaker, the second end of the transmission member is locked to the contact bracket to ensure the stability of the closed state of the circuit breaker. When a short circuit or overload occurs in the circuit in which the circuit breaker is connected, the tripping member performs a tripping action to drive the second end of the transmission member to move until the second end of the transmission member is unlocked from the contact bracket, at this time, the handle, the contact bracket and the tripping member are all reset to the open position under the action of the elastic assembly, and the circuit breaker is automatically switched from the closed state to the open state to realize line protection. It can be seen that the circuit breaker provided by the embodiment of the present application is directly driven by the transmission member, and the tripping member directly pushes the second end of the transmission member when performing a tripping action, the efficient cooperation between the components, and the number of components contained in the circuit breaker is reduced compared with related art, the structure of the circuit breaker is simplified, the operation reliability of the circuit breaker is improved, and this is also conducive to simplifying the preparation process of the circuit breaker, thereby reducing the manufacturing cost of the circuit breaker. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0048] Figure 1 An example structure schematic diagram of a circuit breaker in an open state from a first perspective is provided for the embodiment of the present application.

[0049] Figure 2 An example structure schematic diagram of a circuit breaker in an open state from a second perspective is provided for the embodiment of the present application.

[0050] Figure 3 An example structure schematic diagram of a first cover is provided for the embodiment of the present application.

[0051] Figure 4 An example structure schematic diagram corresponding to the process of switching the circuit breaker from the open state to the closed state is provided for the embodiment of the present application.

[0052] Figure 5 Another example structure schematic diagram corresponding to the process of switching the circuit breaker from the open state to the closed state is provided for the embodiment of the present application.

[0053] Figure 6 A structural schematic view of an exemplary circuit breaker in a closed state according to an embodiment of the present application;

[0054] Figure 7 A structural schematic view of an exemplary circuit breaker when the tripping member performs a tripping action according to an embodiment of the present application;

[0055] Figure 8 A structural schematic view of an exemplary circuit breaker in a switching process from the closed state to the open state according to an embodiment of the present application;

[0056] Figure 9 A structural schematic view of an exemplary handle according to an embodiment of the present application;

[0057] Figure 10 A structural schematic view of an exemplary second elastic member according to an embodiment of the present application;

[0058] Figure 11 A structural schematic view of an exemplary contact support obtained from a first perspective according to an embodiment of the present application;

[0059] Figure 12 A structural schematic view of an exemplary contact support obtained from a second perspective according to an embodiment of the present application;

[0060] Figure 13 An assembly relationship schematic view of an exemplary contact support and a movable contact according to an embodiment of the present application;

[0061] Figure 14 A structural schematic view of an exemplary tripping member according to an embodiment of the present application;

[0062] Figure 15 A structural schematic view of an exemplary transmission member according to an embodiment of the present application;

[0063] Figure 16 An assembly relationship schematic view of an exemplary handle, transmission member, contact support, tripping member and movable contact according to an embodiment of the present application.

[0064] The reference signs respectively represent:

[0065] 1, housing; 10, rotating shaft; 11, first cover body; 12, second cover body;

[0066] 101, stop block; 1021, first connecting sleeve; 1022, second connecting sleeve;

[0067] 1031, second open-limiting surface; 1032, second close-limiting surface;

[0068] 104, third abutting portion; 105, fourth abutting portion;

[0069] 2, handle; 211, hinge part; 2111, first shaft hole; 2112, second shaft hole;

[0070] 2113, torsional spring slot; 2114, torsional spring hanging wall; 212, opening and closing brake limiting part;

[0071] 2121, first opening brake limiting surface; 2122, first closing brake limiting surface; 213, operation part;

[0072] 3, transmission part; 31, first connecting section; 32, transition section; 33, second connecting section;

[0073] 4, contact support; 41, support main part; 410, accommodating cavity; 411, first connecting hole;

[0074] 42, movable connecting part; 420, force applying slot wall; 43, fixed connecting part; 430, insertion hole;

[0075] 44, first abutting part; 45, second abutting part; 46, first stop part; 47, guide part;

[0076] 5, tripping part; 51, tripping main part; 510, surrounding cavity; 511, connecting column;

[0077] 52, tripping driving part; 521, driving section; 522, reinforcing section;

[0078] 53, rotation center part; 530, second connecting hole; 54, second stop part; 55, first trigger part;

[0079] 56, second trigger part; 561, guide section; 562, trigger section; 57, connecting rod;

[0080] 61, moving contact; 62, stationary contact; 71, first elastic member;

[0081] 72, second elastic member; 721, spring body; 722, first elastic arm; 723, second elastic arm;

[0082] 73, third elastic member; 81, short-circuit protection part; 82, overload protection part;

[0083] 91, incoming line terminal; 92, outgoing line terminal; 93, arc extinguishing part.

[0084] Through the above drawings, the specific embodiments of the present application have been shown, and will be described in more detail hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0085] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0086] The directional terms used in the embodiments of this invention, such as "upper," "lower," and "side," are generally... Figure 1 The relative positions shown are used as a reference, with the handle positioned above and the stationary contact positioned below. These directional terms are used merely to more clearly describe the structure and the relationships between it, not to describe absolute positions. The positions may change when the product is placed in different orientations.

[0087] In related technologies, the operating mechanism of a circuit breaker includes multiple components such as a handle, contact support, tripping element, trip lever, lever, and transmission components. The trip lever is hinged to the lever and connected to the handle via the transmission components. When the circuit breaker is closed, the tripping element engages with the trip lever; when the circuit breaker is open, the tripping element disengages from the trip lever, achieving tripping. However, the circuit breakers provided by these technologies have a large number of components, making their structure complex and reducing their reliability.

[0088] To address the technical problems existing in related technologies, embodiments of the present invention provide a circuit breaker, as shown in the attached figure. Figure 1 As shown, the circuit breaker includes a housing 1, an operating module, and a functional module. The operating module includes a handle 2, a transmission component 3, a contact bracket 4, a tripping component 5, and an elastic component. The functional module includes a moving contact 61 and a stationary contact 62, with the stationary contact 62 fixedly arranged at a specific position inside the housing 1.

[0089] Handle 2, contact bracket 4, and tripping component 5 are respectively hinged to housing 1, see [reference]. Figure 1 The first end of the transmission component 3 is hinged to the handle 2, the second end of the transmission component 3 is movably connected to the contact bracket 4, and the moving contact 61 is fixedly connected to the contact bracket 4.

[0090] The circuit breaker provided in this embodiment of the invention is configured such that, when the circuit breaker is closed, the handle 2 drives the contact bracket 4 and the tripping member 5 to rotate through the transmission member 3, and the contact bracket 4 then drives the moving contact 61 to contact the stationary contact 62 to achieve closing, and the second end of the transmission member 3 is locked to the contact bracket 4 in the closed state.

[0091] When the circuit breaker is tripped, the tripping component 5 performs a tripping action to drive the second end of the transmission component 3 to release the lock from the contact bracket 4, thereby causing the handle 2, the contact bracket 4 and the tripping component 5 to reset under the action of the elastic component.

[0092] The circuit breaker provided by the embodiment of the present application is connected in sequence by the handle 2, the transmission member 3, the contact bracket 4 and the movable contact 61. When the circuit breaker is closed, the rotating force of the handle 2 can be directly transmitted to the contact bracket 4 through the transmission member 3 to rotate the contact bracket 4, and the rotating contact bracket 4 further drives the movable contact 61 to move to approach the stationary contact 62 until the two contacts are in contact, so that the function module is powered on, and the circuit breaker is closed. In the closed state of the circuit breaker, the second end of the transmission member 3 is locked to the contact bracket 4 to ensure the stability of the closed state of the circuit breaker. When the circuit breaker is in a short-circuit or overload state, the tripping member 5 performs a tripping action to drive the second end of the transmission member 3 to move until the second end of the transmission member 3 is unlocked from the contact bracket 4. At this time, the handle 2, the contact bracket 4 and the tripping member 5 are all reset to the open position under the action of the elastic assembly, and the circuit breaker is automatically switched from the closed state to the open state to realize line protection.

[0093] It can be seen that the circuit breaker provided by the embodiment of the present application is directly driven by the transmission member 3, and the tripping member 5 directly pushes the second end of the transmission member 3 when performing a tripping action. The efficient cooperation between the components reduces the number of components contained in the circuit breaker compared with related technologies, simplifies the structure of the circuit breaker, improves the operation reliability of the circuit breaker, and is also conducive to simplifying the preparation process of the circuit breaker, thereby reducing the manufacturing cost of the circuit breaker.

[0094] The circuit breaker provided by the embodiment of the present application uses an elastic assembly to help stabilize the state of each component in the open state and the closed state of the circuit breaker. In the open state of the circuit breaker, the elastic assembly is in a first state, and in the closed state of the circuit breaker, the elastic assembly is further compressed from the first state to a second state, and the elastic assembly stores a certain elastic potential energy. When the circuit breaker is switched from the closed state to the open state, the overall balance state of each component is broken, and the elastic potential energy of the elastic assembly is released, and then each component is reset to the initial position. The initial position refers to the position of each component in the open state of the circuit breaker.

[0095] In the embodiment of the present application, the rotating direction of the handle 2, the contact bracket 4 and the tripping member 5 when rotating from the open position to the closed position is defined as the first direction, and vice versa, the rotating direction of the handle 2, the contact bracket 4 and the tripping member 5 when rotating from the closed position to the open position is defined as the second direction. It can be understood that one of the first direction and the second direction is the clockwise direction, and the other is the counterclockwise direction.

[0096] For example, the embodiment of the present application illustrates that the first direction is the clockwise direction, and the second direction is the counterclockwise direction. The following is an exemplary description based on this example.

[0097] In some examples, as shown in the accompanying drawingsFigure 1 and attached Figure 2 As shown, the elastic component includes: a first elastic element 71, a second elastic element 72, and a third elastic element 73.

[0098] The first elastic element 71 is located between the handle 2 and the housing 1, and is configured to reset the handle 2. The first elastic element 71 always applies a counterclockwise rotational torque to the handle 2, which facilitates the reset of the handle 2 to the initial position corresponding to the circuit breaker open state under its action.

[0099] In some examples, the first elastic element 71 is a torsion spring structure, with the spring body of the first elastic element 71 coaxially sleeved on the handle 2, and one torsion arm of the first elastic element 71 abutting against the housing 1. For example, see [link to relevant documentation]. Figure 3 and Figure 4 The first cover 11 of the housing 1 is provided with a first connecting sleeve 1021 and a third abutment portion 104. The spring body of the first elastic member 71 is coaxially sleeved on the first connecting sleeve 1021. The third abutment portion 104 abuts against one torsion arm of the first elastic member 71. The other torsion arm of the first elastic member 71 abuts against the handle 2, for example, as shown in the attached... Figure 9 As shown, a torsion spring hanging wall 2114 is provided on the wall of the handle 2, which abuts against another torsion arm of the first elastic member 71.

[0100] As attached Figure 10 As shown, the second elastic element 72 includes: a spring body 721, a first elastic arm 722, and a second elastic arm 723; the first elastic arm 722 and the second elastic arm 723 are respectively connected to both ends of the spring body 721, and both extend to the same side of the spring body 721; combined with Figure 7 It is known that the spring body 721 is connected to the tripping member 5. For example, the spring body 721 is sleeved on the connecting post 511 provided on the tripping body 51 of the tripping member 5. The first elastic arm 722 abuts against the contact bracket 4. The second elastic arm 723 is connected to the second end of the transmission member 3 so that the second end of the transmission member 3 always abuts against the contact bracket 4.

[0101] By configuring the second elastic member 72 as described above, the second elastic member 72 can not only reset the tripping member 5 to the initial position corresponding to the circuit breaker opening state, but also the second elastic member 72 always applies a pulling force to the second end of the transmission member 3 so that the second end of the transmission member 3 always abuts against the contact bracket 4, ensuring efficient cooperation between the transmission member 3 and the contact bracket 4.

[0102] As attached Figure 2As shown, the third elastic member 73 is located between the contact bracket 4 and the housing 1, and is configured to reset the contact bracket 4. For the third elastic member 73, it always exerts a force on the contact bracket 4 in the counterclockwise direction to reset the contact bracket 4 to the initial position corresponding to the circuit breaker tripping state.

[0103] In some examples, the third elastic member 73 is a torsion spring structure, the spring body of the third elastic member 73 is coaxially sleeved on the contact bracket 4 (i.e., the rotation center lines of the two coincide), and one torsion arm of the third elastic member 73 abuts against the housing 1, for example, as shown in the accompanying drawings. Figure 3 As shown, the first cover 11 of the housing 1 is provided with a fourth abutting portion 105, which abuts against one torsion arm of the third elastic member 73. The other torsion arm of the third elastic member 73 abuts against the contact bracket 4, for example, the contact bracket 4 is provided with a second abutting portion 45, which abuts against the other torsion arm of the third elastic member 73.

[0104] For the housing 1, it includes the first cover 11 and the second cover 12, which are connected in a clamping, riveting, screwing or the like manner to cooperatively form a containing space to accommodate the above-mentioned components. In the embodiment of the application, one of the first cover 11 and the second cover 12 serves as a base, and the other serves as an upper cover.

[0105] The accompanying drawings illustrate the assembly relationship between the handle 2, the transmission member 3, the contact bracket 4, the trip member 5, and the movable contact 61, and the following further describes the structure of each component and its function in combination with the above-mentioned components in the circuit breaker: Figure 16 In some implementations, as shown in the accompanying drawings,

[0106] - The accompanying drawings illustrate the assembly relationship between the handle 2, the transmission member 3, the contact bracket 4, the trip member 5, and the movable contact 61, and the following further describes the structure of each component and its function in combination with the above-mentioned components in the circuit breaker: Figure 11 - The accompanying drawings illustrate the assembly relationship between the handle 2, the transmission member 3, the contact bracket 4, the trip member 5, and the movable contact 61, and the following further describes the structure of each component and its function in combination with the above-mentioned components in the circuit breaker: Figure 12 As shown, the contact bracket 4 includes a bracket main body portion 41, a movable connection portion 42, a fixed connection portion 43, and a first abutting portion 44; wherein the bracket main body portion 41 is hinged to the rotating shaft 10 provided on the housing 1; the movable connection portion 42 and the first abutting portion 44 are both connected to a first end of the bracket main body portion 41, and the movable connection portion 42 is further movably connected to a second end of the transmission member 3, and the first abutting portion 44 further abuts against the first elastic arm 722 of the second elastic member 72. The fixed connection portion 43 is connected to a second end of the bracket main body portion 41, and the fixed connection portion 43 is further fixedly connected to one end of the movable contact 61 (see Figure 13 ).

[0107] Wherein, the first end of the bracket main body portion 41 can be considered as its upper end, and vice versa, the second end of the bracket main body portion 41 can be considered as its lower end.

[0108] The rotating shaft 10 is hinged to the shell 1 by the bracket main body 41, so that the contact bracket 4 can rotate relative to the shell 1.

[0109] By arranging the movable connecting part 42 and the first abutting part 44 at different positions of the first end of the bracket main body 41, the movable connecting part 42 is movably connected to the second end of the transmission member 3, so that the first elastic arm 722 and the second elastic arm 723 of the second elastic member 72 on the same side are connected to the first abutting part 44 and the second end of the transmission member 3, respectively. In this way, the second end of the transmission member 3 simultaneously acts on the contact bracket 4 and the second elastic member 72, and the contact bracket 4 is directly driven to rotate, and the second elastic member 72 is elastically deformed, so that the release member 5 is also rotated.

[0110] By arranging the fixed connecting part 43 at the second end of the bracket main body 41, the movable contact 61 is located at the farthest end of the bracket main body 41, which is beneficial to increase the movement stroke of the movable contact 61 and improve the contact reliability between the contacts.

[0111] In some examples, as shown in the accompanying drawings, Figure 11 - the accompanying drawings Figure 12 As shown in the accompanying drawings, the bracket main body 41 comprises a receiving cavity 410, and as shown in the accompanying drawings, Figure 14 As shown in the accompanying drawings, the release member 5 comprises a release main body 51, a release driving part 52, and a rotating center part 53; the release main body 51 has a surrounding cavity 510, and further combined with the accompanying drawings, Figure 1 As shown in the accompanying drawings, the release main body 51 is arranged outside the contact bracket 4 through the surrounding cavity 510; the release driving part 52 is connected to the first end of the release main body 51, and the release driving part 52 extends into the receiving cavity 410 to drive the second end of the transmission member 3; the rotating center part 53 is connected to the inner side wall of the release main body 51, and the rotating center part 53 extends into the receiving cavity 410 and is hinged to the rotating shaft 10.

[0112] By arranging the surrounding cavity 510, the release main body 51 is arranged outside the contact bracket 4, which can avoid the interference of the contact bracket 4 when the release main body 51 rotates, and also facilitates the assembly of the contact bracket 4 and the release member 5 to be more compact.

[0113] The release driving part 52 of the release member 5 extends into the receiving cavity 410 at a first position, and in the open state and the closed state of the circuit breaker, the release driving part 52 is separated from the second end of the transmission member 3 (i.e. the second connecting segment 33 of the transmission member 3 described below), and there is no interaction between them.

[0114] When the release member 5 is triggered and a release action occurs, the release driving part 52 can act on the second end of the transmission member 3, and then push the second end of the transmission member 3 to release the locking state between the contact bracket 4 and the transmission member 3.

[0115] The rotating center part 53 of the tripping piece 5 extends into the second position of the accommodating cavity 410 to be hinged with the rotating shaft 10 arranged on the shell 1. It can be understood that the rotating center part 53 and the support body part 41 are simultaneously hinged with the rotating shaft 10, that is, they share one rotating shaft 10.

[0116] In some examples, as shown in the accompanying drawings, Figure 11 - the accompanying drawings, Figure 12 As shown, the support body part 41 is respectively provided with one first connecting hole 411 on the wall on both sides of the accommodating cavity 410, and further combined Figure 14 , the rotating center part 53 is provided with a second connecting hole 530; the first connecting hole 411 and the second connecting hole 530 are in communication, and both are hinged with the rotating shaft 10.

[0117] It can be understood that one of the first connecting hole 411, the second connecting hole 530 and the other first connecting hole 411 are sequentially communicated, and the rotating shaft 10 arranged on the shell 1 penetrates the above holes in sequence to realize the hinge, so that the contact support 4 is rotatable relative to the shell 1, and the tripping piece 5 is rotatable relative to the shell 1.

[0118] For example, the first connecting hole 411 can be respectively located at the middle position of the corresponding wall of the support body part 41, so that the rotating center of the contact support 4 is as close to the middle part as possible.

[0119] The second connecting hole 530 can be a circular hole, and the inner diameter of the second connecting hole 530 is matched with the diameter of the rotating shaft 10, and the gap between them can be matched.

[0120] In some examples, as shown in the accompanying drawings, Figure 12 The first connecting hole 411 is a waist-shaped hole, that is, it is a long strip-shaped hole, and its radial width is matched with the diameter of the rotating shaft 10, and its radial length is greater than the diameter of the rotating shaft 10. The first connecting hole 411 is configured to allow the contact support 4 to rotate in sequence with the rotating shaft 10 and the contact surface of the moving contact 61 and the stationary contact 62 as the rotating fulcrum.

[0121] During the closing operation of the circuit breaker, the rotating stroke of the contact support 4 can be divided into two stages. First, the contact support 4 rotates with the rotating shaft 10 as the rotating fulcrum until the moving contact 61 contacts the stationary contact 62. Then, the contact support 4 continues to rotate with the contact surface of the moving contact 61 and the stationary contact 62 as the rotating fulcrum, so that the contact pressure between the moving contact 61 and the stationary contact 62 gradually increases to the target value.

[0122] As can be seen, when the circuit breaker performs a closing operation, the moving contact 61 first rotates, causing its contact point to approach and contact the stationary contact 62. Then, the moving contact 61 continues to move closer to the stationary contact 62, ensuring tight contact between the moving contact 61 and the stationary contact 62. This improves the connection reliability between the moving and stationary contacts and significantly enhances the operational reliability of the circuit breaker. The aforementioned arrangement of the first connecting hole 411 increases the contact pressure between the moving contact 61 and the stationary contact 62, achieving a stable closing state for the circuit breaker. The housing 1 contains an arc-extinguishing element 93 (also known as an arc-extinguishing chamber) to absorb the electric arc generated during contact or disconnection.

[0123] Appendix Figure 11 and attached Figure 12 An example of a contact support 4 structure is shown in the attached figure. Figure 11 and attached Figure 12 As shown, the main body 41 of the contact bracket 4 includes two parallel and opposite support plates, forming a receiving cavity 410 between the two support plates. The two support plates mentioned here are the "walls located on both sides of the receiving cavity 410" mentioned above.

[0124] Furthermore, to improve the structural strength and stability of the contact support 4, the main body 41 of the support also includes a reinforcing plate, the two ends of which are respectively connected to the middle of the side of the two support plates opposite to the tripping member 5. For example, the support plate can be rectangular.

[0125] The end of the support body 41 closest to the handle 2 is defined as its first end. The movable connecting part 42 can be located at the middle position of the first end of the support body 41, thereby making the drive of the transmission member 3 to the contact support 4 more stable and precise. For example, the movable connecting part 42 can be provided at the middle position of the first end of the two support plates of the support body 41.

[0126] The first abutment 44 can be provided at one side of the first end of the bracket body 41. For example, the first abutment 44 can be provided at one side of the first end of one of the support plates of the bracket body 41. In some examples, one end of the first abutment 44 is connected to the support plate, and the other end of the first abutment 44 extends along the direction close to the second cover 12 of the housing 1.

[0127] In some examples, the movable connection 42 is groove-shaped and is disposed at the first end of the wall of the bracket body 41 located on both sides of the receiving cavity 410; the movable connection 42 is configured to receive the second end of the transmission member 3 and to lock the second end of the transmission member 3 when the circuit breaker is closed.

[0128] The second end of the transmission component 3 can enter the groove-shaped movable connecting part 42 and always abut against its groove wall. In this way, the second end of the transmission component 3 moves within it and pushes the movable connecting part 42, thereby causing the contact support 4 to rotate. After the contact support 4 rotates to the fully closed state of the circuit breaker, the second end of the transmission component 3 can be engaged in the groove of the movable connecting part 42. In this way, the position of the transmission component 3 is fixed, and consequently the positions of the contact support 4 and the tripping component 5 are also fixed accordingly.

[0129] For example, as shown in the appendix Figure 4 As shown, the movable connection 42 is a slot with a top opening. The second end of the transmission member 3 enters the slot through its top opening. The movable connection 42 includes a force-applying groove wall 420, which always abuts against the second end of the transmission member 3. The force-applying groove wall 420 is formed on one side of the slot.

[0130] For example, the slot where the movable connection part 42 is located includes: a top opening and a first side wall, a bottom wall, and a second side wall connected in sequence, wherein the top opening is formed between the first side wall and the second side wall, and the top opening is opposite to the bottom wall of the slot. The first side wall is farther away from the handle 2 than the second side wall, so the first side wall can serve as the force-applying groove wall 420.

[0131] In some examples, in order to make the transmission between the movable connection 42 and the transmission member 3 more sensitive and smooth, the force-applying groove wall 420 of the movable connection 42 can be a raised arc shape (i.e., an arc-shaped surface), while the surface of the transmission member 3 that contacts the force-applying groove wall 420 is a plane. For example, the second end of the transmission member 3 can be a rectangular rod shape.

[0132] The fixed connection part 43 is connected to the second end of the bracket body part 41. In some examples, such as the attached... Figure 11 As shown, the fixed connection part 43 is plate-shaped. One end of the fixed connection part 43 is connected to the wall of the bracket body part 41 located on one side of the receiving cavity 410, and the other end of the fixed connection part 43 extends toward the wall of the receiving cavity 410 on the other side of the bracket body part 41. In this way, the central axis of the fixed connection part 43 coincides with the central axis of the receiving cavity 410, thereby making the moving contact 61 centrally mounted on the contact bracket 4.

[0133] The fixed connection part 43 is fixedly connected to the end of the moving contact 61. The fixed connection method includes, but is not limited to, riveting, welding, and bonding.

[0134] In some examples, such as the attached Figure 11 As shown, the fixed connection part 43 has a socket 430, which coincides with the central axis of the accommodating cavity 410, and the socket 430 is fixedly connected to one end of the moving contact 61.

[0135] The insertion of the corresponding end of the movable contact 61 into the insertion hole 430 of the fixed connecting portion 43 facilitates the improvement of the connection strength between the movable contact 61 and the fixed connecting portion 43. Moreover, the insertion hole 430 coincides with the central axis of the accommodating cavity 410, so that the movable contact 61 is centrally fitted in the contact support 4, and the force from the contact support 4 is more efficiently transmitted to the movable contact 61.

[0136] In some examples, the contact support 4 and the movable contact 61 are both metal structural members, and one end of the movable contact 61 is welded or riveted in the insertion hole 430 of the fixed connecting portion 43 of the contact support 4.

[0137] As described above, the first abutting portion 44 is arranged at the first end of the outer side wall of the support body portion 41 on the first side of the accommodating cavity 410, and further, the first abutting portion 44 is located at the side edge of the first end of the outer side wall of the corresponding side of the support body portion 41.

[0138] Further, the contact support 4 provided by the embodiment of the present application further comprises a second abutting portion 45, which is arranged on the outer side wall of the support body portion 41 on the second side of the accommodating cavity 410 (i.e. facing the second cover 12 of the shell 1), and the second abutting portion 45 also abuts one torsional arm of the third elastic member 73.

[0139] In some examples, the second abutting portion 45 is located at the position close to the first connecting hole 411 of the outer side wall of the corresponding side of the support body portion 41.

[0140] The arrangement of the third elastic member 73 satisfies that it can always provide a force rotating in the counterclockwise direction to the contact support 4, and on the basis of satisfying the above requirement, the third elastic member 73 can be assembled in the following manner:

[0141] As shown in the accompanying drawings, Figure 2 The third elastic member 73 is a torsional spring, the spring body of which is sleeved on the boss (not shown in the figure) arranged on the second cover 12 of the shell 1, and the spring body of the third elastic member 73 coincides with the central axis of the rotating shaft 10 arranged on the first cover 11; one torsional arm of the third elastic member 73 abuts against the abutting block arranged on the second cover 12, and the other torsional arm abuts against the above-mentioned second abutting portion 45 of the contact support 4.

[0142] Further, in some examples, as shown in the accompanying drawings, Figure 11 and Figure 12 The contact support 4 further comprises a first stop portion 46 connected to the first end of the support body portion 41; in the open state of the circuit breaker, the first stop portion 46 is used to abut against the stop block 101 arranged on the shell 1 (see Figure 3)。For the stop block 101 arranged on the shell 1, for example, it can be a protrusion.

[0143] For example, the first stop part 46 is arranged as two, the support body part 41 includes a receiving cavity 410, and the two first stop parts 46 can be located at the first end of the wall of the support body part 41 on both sides of the receiving cavity 410.

[0144] In some examples, for the first end of the support body part 41, the first stop part 46, the movable connection part 42 and the first abutting part 44 are arranged in sequence and side by side, the movable connection part 42 is in a groove shape, the side of the first stop part 46 facing the groove of the movable connection part 42 is used to form the groove wall of the movable connection part 42, and the side of the first stop part 46 away from the groove of the movable connection part 42 is used to abut the stop block 101 arranged on the shell 1.

[0145] As described above, the third elastic member 73 always provides a force along the counterclockwise rotation to the contact support 4, and in the off state of the circuit breaker, the first stop part 46 on the contact support 4 abuts the stop block 101 on the shell 1, which can prevent the contact support 4 from rotating counterclockwise, so that the contact support 4 is stable at the off position.

[0146] In some examples, as shown in FIGS. 1 to 4, the contact support 4 further includes a guide part 47 connected to the second end of the support body part 41, and the guide part 47 is used to slide fit with the guide structure (not shown in the figure) arranged on the shell 1, so that the contact support 4 rotates according to the set rotation track. Figure 11 and FIGS. 5 to 8, the contact support 4 further includes a guide part 47 connected to the second end of the support body part 41, and the guide part 47 is used to slide fit with the guide structure (not shown in the figure) arranged on the shell 1, so that the contact support 4 rotates according to the set rotation track. Figure 12 As shown in FIGS. 1 to 4, the guide structure arranged on the shell 1 can be a protrusion additionally arranged thereon, or can be the inner side wall of the shell 1, and one side surface of the guide structure abuts the surface of the guide part 47 facing the shell 1, so that when the contact support 4 rotates, the guide part 47 thereon slides relative to the guide structure on the shell 1, avoiding the rotating contact support 4 from approaching or moving away from the shell 1, and ensuring that the contact support 4 rotates according to the set rotation track.

[0147] As shown in FIGS. 1 to 4, the guide structure arranged on the shell 1 can be a protrusion additionally arranged thereon, or can be the inner side wall of the shell 1, and one side surface of the guide structure abuts the surface of the guide part 47 facing the shell 1, so that when the contact support 4 rotates, the guide part 47 thereon slides relative to the guide structure on the shell 1, avoiding the rotating contact support 4 from approaching or moving away from the shell 1, and ensuring that the contact support 4 rotates according to the set rotation track.

[0148] As shown in FIGS. 1 to 4, the guide structure arranged on the shell 1 can be a protrusion additionally arranged thereon, or can be the inner side wall of the shell 1, and one side surface of the guide structure abuts the surface of the guide part 47 facing the shell 1, so that when the contact support 4 rotates, the guide part 47 thereon slides relative to the guide structure on the shell 1, avoiding the rotating contact support 4 from approaching or moving away from the shell 1, and ensuring that the contact support 4 rotates according to the set rotation track. Figure 14 As shown in FIGS. 1 to 4, the guide structure arranged on the shell 1 can be a protrusion additionally arranged thereon, or can be the inner side wall of the shell 1, and one side surface of the guide structure abuts the surface of the guide part 47 facing the shell 1, so that when the contact support 4 rotates, the guide part 47 thereon slides relative to the guide structure on the shell 1, avoiding the rotating contact support 4 from approaching or moving away from the shell 1, and ensuring that the contact support 4 rotates according to the set rotation track.

[0149] The rotating center portion 53 is located within the cavity 510 of the tripping body portion 51. The center of the rotating center portion 53 coincides with the center of the tripping body portion 51. In some examples, the rotating center portion 53 is an annular plate with its central through hole being the aforementioned second connecting hole 530. The rotating center portion 53 can be connected to the inner wall of the tripping body portion 51 via the connecting rod 57 to ensure that the centers of the two coincide.

[0150] The tripping drive unit 52 is connected to the first end of the tripping body 51 near the handle 2. One end of the tripping drive unit 52 is connected to the inner side wall of the tripping body 51, and the other end of the tripping drive unit 52 extends in a radially inward direction.

[0151] Furthermore, as shown in the appendix Figure 14 As shown, the tripping drive unit 52 includes a drive section 521 and a reinforcing section 522 arranged at an angle. The end of the drive section 521 away from the reinforcing section 522 is connected to the inner side wall of the tripping main body 51, and the end of the reinforcing section 522 away from the drive section 521 is connected to the outer side wall of the rotation center 53. In this way, the two ends of the tripping drive unit 52 are respectively connected to the tripping main body 51 and the rotation center 53, so that the tripping member 5 has stronger structural stability.

[0152] Furthermore, the drive section 521 and the reinforcing section 522 are arranged at an angle to ensure that the reinforcing section 522 can be easily connected to the outer wall of the rotation center 53.

[0153] In some examples, both the drive section 521 and the reinforcing section 522 are rod-shaped. For example, the cross-section of the drive section 521 is rectangular or square. In this way, when the release member 5 performs the release action, the drive section 521 uses its planar drive to drive the second end of the transmission member 3, which helps to increase the contact friction between the two and makes the driving process more efficient.

[0154] In some examples, such as the attached Figure 14 As shown, the tripping component 5 provided in this embodiment of the invention further includes: a second stop portion 54, which is connected to the inner side wall of the tripping main body portion 51; in the circuit breaker open state, the second stop portion 54 is used to abut against the fixed connection portion 43 to stop (see...). Figure 1 ); and, in the closed state of the circuit breaker, the tripping drive unit 52 abuts against the second end of the transmission member 3 to a stop position (see Figure 5 ).

[0155] In the clockwise rotation direction of the tripping piece 5, the tripping driving part 52, the rotation center part 53, and the second stop part 54 are sequentially arranged. In the open state of the circuit breaker, the second stop part 54 abuts against the fixed connection part 43 of the contact support 4, and further makes the tripping piece 5 stable at the open position. In the closed state of the circuit breaker, the tripping driving part 52 abuts against the second end of the transmission piece 3, and further makes the tripping piece 5 stable at the closed position.

[0156] The surface of the second stop part 54 abutting against the fixed connection part 43 is a plane, so as to obtain a stable abutting effect. For example, the second stop part 54 can be a triangular block.

[0157] In some examples, as shown in FIG. 1, the tripping piece 5 further comprises a first trigger part 55 and a second trigger part 56. The first trigger part 55 is connected to the second end of the tripping main body part 51, and the second trigger part 56 is connected to the outer side wall of the tripping main body part 51 between the first end and the second end thereof. Figure 14 Figure 4 As shown in FIG. 1, the functional module further comprises a short-circuit protection piece 81 and an overload protection piece 82. The short-circuit protection piece 81 is configured to, when the circuit breaker is in a short-circuit state, push the first trigger part 55, so that the tripping piece 5 performs a tripping action. The overload protection piece 82 is configured to, when the circuit breaker is in an overload state, push the second trigger part 56, so that the tripping piece 5 performs a tripping action.

[0158] In some examples, in the clockwise rotation direction of the tripping piece 5, the tripping driving part 52, the rotation center part 53, the second stop part 54, the second trigger part 56, and the first trigger part 55 are sequentially arranged.

[0159] For example, the first trigger part 55 is consistent with the arc of the tripping main body part 51, so as to be smoothly connected (i.e., the inner side wall and the outer side wall of the two are held flat). Further, the thickness of the first trigger part 55 can be greater than the thickness of the tripping main body part 51, so that the first trigger part 55 can provide a larger trigger area to contact the short-circuit protection piece 81. Here, the "thickness" refers to the dimension in the direction of the center axis of the tripping main body part 51.

[0160] For example, the second trigger part 56 comprises a guide segment 561 and a trigger segment 562. The end of the guide segment 561 away from the trigger segment 562 is connected to the outer side wall of the tripping main body part 51, and the end of the guide segment 561 connected to the trigger segment 562 extends in the radially outward direction.

[0161] ​The trigger section 562 and the guide section 561 are arranged at an angle, for example, the angle between the two is 90°, that is, the two are connected perpendicularly (the guide section 561 extends in the direction close to the first cover 11), so that the trigger section 562 can be delivered to the corresponding position. When the circuit breaker is closed, the trigger section 562 abuts against the overload protection component 82.

[0162] The guide section 561 of the second triggering part 56 can be a straight rod or a bent rod. In order to avoid interference between the tripping member 5 and other components, and to achieve the purpose of making the internal structure of the circuit breaker more compact, the guide section 561 of the second triggering part 56 can be a bent rod.

[0163] The short-circuit protection element 81 and overload protection element 82 included in the functional module are both common in the art. For example, the short-circuit protection element 81 is an electromagnetic tripping device, which includes a telescopic head capable of telescopic movement. When the short-circuit protection element 81 detects a short circuit in the circuit where the circuit breaker is located, as shown in the attached... Figure 7 As shown, the telescopic head of the short-circuit protection component 81 extends and pushes the first trigger part 55, thereby causing the tripping component 5 to rotate counterclockwise to perform the tripping action.

[0164] Overload protection element 82 is a thermomagnetic tripping device, which includes a bimetallic strip that can be deformed by heat. When overload protection element 82 detects an overload in the circuit where the circuit breaker is located, as shown in the attached... Figure 7 As shown, the bimetallic strip deforms due to heat and pushes the second trigger part 56, thereby causing the tripping member 5 to rotate counterclockwise to perform the tripping action.

[0165] Understandably, the functional module also includes an input terminal 91 and an output terminal 92. The input terminal 91 can be electrically connected to the overload protection device 82 and the moving contact 61 via a flexible wire, and the output terminal 92 can be electrically connected to the short circuit protection device 81 and the stationary contact 62 via a wire.

[0166] As attached Figure 10 As shown, the second elastic element 72 includes: a spring body 721, a first elastic arm 722, and a second elastic arm 723; the first elastic arm 722 and the second elastic arm 723 are respectively connected to both ends of the spring body 721, and both extend to the same side of the spring body 721; the spring body 721 is connected to the release body 51, the first elastic arm 722 abuts against the first abutting part 44; the second elastic arm 723 is connected to the second end of the transmission member 3, so that the second end of the transmission member 3 always abuts against the movable connecting part 42.

[0167] In some examples, the second elastic arm 723 is sleeved on the second end of the transmission member 3, i.e., the second elastic arm 723 is sleeved on the part of the second end of the transmission member 3 inside the accommodating cavity 410. In this way, the second elastic member 72 can always pull the transmission member 3 downward, so that the second end of the transmission member 3 always abuts against the movable connection portion 42.

[0168] For example, the second elastic arm 723 can be a U-shaped arm, and the first elastic arm 722 can be a straight arm.

[0169] In some examples, as shown in FIG. 6, the transmission member 3 includes a first connection segment 31, a transition segment 32 and a second connection segment 33 connected in sequence, and the first connection segment 31 and the second connection segment 33 are located on the same side of the transition segment 32. The first connection segment 31 is hingedly connected with the handle 2, and the second connection segment 33 is movably connected with the contact support 4. Figure 15

[0170] By arranging the transmission member 3 as above, the transmission member 3 is connected with the contact support 4 and the handle 2 at the same time, and a high-efficiency and smooth transmission effect is obtained.

[0171] Considering that the first connection segment 31 is hingedly connected with the handle 2, in order to make the rotation of the handle 2 more smooth, the first connection segment 31 can be a cylindrical rod.

[0172] Considering that the second connection segment 33 is movably connected with the contact support 4 to push the contact support 4 to rotate, the second connection segment 33 can be a non-cylindrical rod, for example, the cross section of the second connection segment 33 is rectangular or square. In this way, the surface of the second connection segment 33 abutting against the movable connection portion 42 of the contact support 4 is a plane, which can increase the contact stability between the second connection segment 33 and the movable connection portion 42, so that the second connection segment 33 can always abut against the movable connection portion 42 of the contact support 4 to stably drive it, without the undesired slippage phenomenon.

[0173] In the circuit breaker provided by the related art, the structure of the contact support is relatively complex, so that it can only be formed by an injection molding process, which determines that the contact support is a plastic structural member. The plastic structural member is greatly affected by the environment, for example, it is easily affected by temperature, humidity, etc. In this way, under the rated load, the plastic structural member is subjected to high temperature for a long time, which can cause serious deformation, and eventually can cause the contact pressure between the contacts to decrease, resulting in high temperature rise. All the above are not conducive to the service life of the circuit breaker.

[0174] ​Based on the contact support 4 provided in the embodiments of the present invention, the contact support 4 has the advantages of simple structure and convenient molding. Based on this, the material of the contact support 4 provided in the embodiments of the present invention can be metal material, and the contact support 4 can be an integrally formed metal structural component, such as a stainless steel structural component.

[0175] Metal structural components overcome the aforementioned problems of plastic structural components. The contact support 4 has stronger structural stability and temperature and humidity resistance, and is more reliable in force transmission. This improves the contact pressure and contact reliability between the moving contact 61 and the stationary contact 62, and also increases the service life of the contact support 4.

[0176] In some examples, the transmission component 3 provided in this embodiment of the invention can also be made of metal. The metal transmission component 3 pushes the contact support 4, further improving the reliability of force transmission and effectively enhancing the contact reliability between the moving contact 61 and the stationary contact 62. For example, the transmission component 3 can be made of square steel; simply grinding its first connecting section 31 into a cylindrical rod is sufficient.

[0177] Handle 2 is hinged to housing 1. When handle 2 is rotated, transmission component 3 will be driven by handle 2 to rotate and translate simultaneously, thereby pushing contact bracket 4 and tripping component 5 to rotate and realize the closing of circuit breaker.

[0178] For example, as shown in the appendix Figure 9 As shown, the handle 2 includes: a hinge part 211, a closing / opening limit part 212, and an operating part 213 connected in sequence, as shown in the attached diagram. Figure 3 As shown, the first cover 11 has a handle mounting groove, and the handle 2 is assembled in the handle mounting groove. The first cover 11 is provided with a first connecting sleeve 1021, and the hinge part 211 has a first shaft hole 2111 corresponding to the first connecting sleeve 1021. The first connecting sleeve 1021 is fitted into the first shaft hole 2111, so that the hinge part 211 is hinged to the first cover 11. The opening and closing limit part 212 penetrates the housing 1 (i.e., the first cover 11 and the second cover 12), so that the operating part 213 is located outside the housing 1. The user pushes the operating part 213 to operate the handle 2.

[0179] At least one of the hinge portion 211 and the opening / closing limit portion 212 of the handle 2 is provided with a first opening limit surface 2121 and a first closing limit surface 2122. The housing 1 (i.e., the first cover 11 and the second cover 12) is provided with a second opening limit surface 1031 and a second closing limit surface 1032 at corresponding positions.

[0180] In some examples, such as the attached Figure 9As shown, the opposite sides of the opening and closing limiting part 212 are respectively provided with a first opening limiting surface 2121 and a first closing limiting surface 2122. As shown in the accompanying Figure 3 As shown, the top of the shell 1 is provided with a through hole for the opening and closing limiting part 212 to pass through, and the two sides of the through hole are respectively provided with a second opening limiting surface 1031 and a second closing limiting surface 1032.

[0181] When the circuit breaker is in the opening state, the first opening limiting surface 2121 on the handle 2 abuts against the second opening limiting surface 1031 on the shell 1, and the handle 2 is stably kept in the opening position. When the circuit breaker is in the closing state, the first closing limiting surface 2122 on the handle 2 abuts against the second closing limiting surface 1032 on the shell 1, and the handle 2 is stably kept in the closing position.

[0182] The first elastic member 71 always provides a torque to the handle 2 in the opening direction, so that the handle 2 is in the opening position in the normal state. In some examples, as shown in the accompanying Figure 9 As shown, the hinge part 211 of the handle 2 is provided with a torsion spring slot 2113 and a torsion spring hanging wall 2114, and one end of the torsion spring slot 2113 extends to the torsion spring hanging wall 2114.

[0183] The spring body 721 of the first elastic member 71 is embedded in the torsion spring slot 2113 and located between the hinge part 211 and the first cover body 11, one torsion arm of the first elastic member 71 is lapped on the torsion spring hanging wall 2114, and the other torsion arm abuts against the third abutting part 104 provided at the corresponding position on the first cover body 11.

[0184] The structure of the circuit breaker provided by the embodiment of the present application is described exemplarily in combination with the working process of the circuit breaker:

[0185] (1) The circuit breaker is in the opening state

[0186] The structure of the circuit breaker in the opening state is exemplified, and the structure of the circuit breaker in the closing state is exemplified. Figure 1 The structure of the circuit breaker in the opening state is exemplified, and the structure of the circuit breaker in the closing state is exemplified. Figure 1, the handle 2 is in the open position under the elastic action of the first elastic member 71, wherein the first open limiting surface 2121 on the handle 2 abuts against the second open limiting surface 1031 on the shell 1; the transmission member 3 abuts against the movable connecting part 42 of the contact support 4 under the tension of the second elastic member 72; the contact support 4 is in the initial position under the elastic action of the third elastic member 73, wherein the first stop part 46 on the contact support 4 abuts against the stop block 101 on the shell 1. The trip member 5 is in the initial position under the action of the second elastic member 72, wherein the second stop part 54 of the trip member 5 abuts against the fixed connecting part 43 of the contact support 4. The moving contact 61 is stably at a position away from the static contact 62 under the support of the contact support 4. The above-mentioned components act on each other, so that the whole structure is in a balanced state, and the circuit breaker is stably in the open state.

[0187] (2) The circuit breaker is in the closed state

[0188] Referring to Figure 4 , the user rotates the handle 2, and the handle 2 rotates in the closing direction (hereinafter defined as clockwise rotation) against the counterforce of the first elastic member 71, thereby driving the transmission member 3 to push the contact support 4 to rotate clockwise against the counterforce of the third elastic member 73. In this process, the transmission member 3 always abuts against the movable connecting part 42 of the contact support 4 under the elastic action of the second elastic member 72, so that the transmission member 3 can drive the trip member 5 to rotate clockwise while driving the contact support 4 to rotate, because the changing elastic force of the second elastic member 72 acts on the trip member 5, and the fixed connecting part 43 of the contact support 4 no longer stops the second stop part 54 of the trip member 5 as it rotates.

[0189] The clockwise rotation of the contact support 4 includes two stages, as shown in Figure 4 and Figure 5 shows the first stage, the contact support 4 rotates around the pivot 10 as a fulcrum, at this time, the pivot 10 is always located in the right half of the first connecting hole 411 on the contact support 4, until the contact point of the moving contact 61 contacts the contact point of the static contact 62. In the second stage, the handle 2 continues to rotate, and the contact support 4 further rotates around the contacted contact points as a fulcrum under the driving action of the transmission member 3, until the contact pressure between the moving contact 61 and the static contact 62 reaches the target value. At this time, the circuit breaker switches to the closed state.

[0190] (3) The circuit breaker is in the closed state

[0191] The structure of the circuit breaker in the closed state is shown in Figure 6 Figure 6 ​As shown, in the closed state of the circuit breaker, the handle 2 compresses the first elastic member 71 and rotates to the closed position, wherein the first closed limiting surface 2122 on the handle 2 abuts against the second closed limiting surface 1032 on the shell 1; the transmission member 3 abuts against the movable connecting part 42 of the contact support 4 under the tension of the second elastic member 72 and is clamped in the slot thereon (see Figure 6 ); the contact support 4 compresses the third elastic member 73 and is stabilized at the rotational limit position, because the movable contact 61 connected with the contact support 4 abuts against the fixed contact 62. The trip member 5 is also correspondingly stabilized at the rotational limit position, wherein the trip driving part 52 of the trip member 5 abuts against the second connecting section 33 of the transmission member 3 to achieve the stop. The above-mentioned components work together, so that the whole structure is in a balanced state, and the circuit breaker is stabilized at the closed state.

[0192] (4) The trip member 5 performs the tripping action, and the circuit breaker is automatically switched from the closed state to the open state

[0193] (41) Figure 7 The tripping process of the trip member 5 is illustrated. When the short-circuit protection member 81 detects a short circuit in the circuit in which the circuit breaker is connected, the telescopic head of the short-circuit protection member 81 extends and pushes the first trigger part 55, so that the trip member 5 rotates counterclockwise, and the counterclockwise rotating trip member 5 pushes the second connecting section 33 of the transmission member 3 upward through the trip driving part 52, so that the second connecting section 33 is separated from the slot of the movable connecting part 42 of the contact support 4, and the trip member 5 completes the tripping action (see Figure 7 ). At this time, the whole structure in the balanced state is destabilized (i.e. no longer balanced), the contact support 4 is reset (i.e. counterclockwise rotated) under the action of the third elastic member 73, and then drives the movable contact 61 and the fixed contact 62 to separate, until the contact support 4 is counterclockwise rotated to the initial position. At the same time, the handle 2 is reset under the action of the first elastic member 71 and drives the transmission member 3 to reset, and the trip member 5 is reset to the initial position under the action of the transmission member 3 and the second elastic member 72, and the circuit breaker is switched to the open state.

[0194] (42) Figure 7 The tripping process of the trip member 5 is illustrated. When the overload protection member 82 detects an overload in the circuit in which the circuit breaker is connected, the bimetallic strip of the overload protection member 82 is deformed by heat and pushes the second trigger part 56, so that the trip member 5 rotates counterclockwise, and the counterclockwise rotating trip member 5 pushes the second connecting section 33 of the transmission member 3 upward through the trip driving part 52, so that the second connecting section 33 is separated from the slot of the movable connecting part 42 of the contact support 4, and the trip member 5 completes the tripping action (see Figure 7). At this time, the structure as a whole is destabilized from the balanced state (i.e. no longer balanced), the contact support 4 is reset (i.e. counterclockwise rotation) under the action of the third elastic member 73, and in turn drives the moving contact 61 and the static contact 62 to separate, until the contact support 4 is counterclockwise rotated to the initial position. At the same time, the handle 2 is reset under the action of the first elastic member 71 and drives the transmission member 3 to reset, and the trip unit 5 is reset to the initial position under the action of the transmission member 3 and the second elastic member 72, and the circuit breaker is switched to the open state.

[0195] In summary, the circuit breaker provided by the embodiment of the present application has the advantages of less number of components, small size, simple structure, simple assembly, high working reliability, long service life and the like, and is convenient for mass production. In particular, because the number of components is further reduced, the structural complexity of the circuit breaker is significantly reduced, and in turn the material cost and manufacturing cost are significantly reduced.

[0196] The above description is only to facilitate the understanding of the technical solutions of the present application by those skilled in the art, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A circuit breaker characterized by, The circuit breaker comprises a shell (1), an operation module and a function module, wherein the operation module comprises a handle (2), a transmission member (3), a contact support (4), a tripping member (5) and an elastic assembly, and the function module comprises a moving contact (61) and a static contact (62); The handle (2), the contact support (4) and the tripping member (5) are respectively hinged to the shell (1), the first end of the transmission member (3) is hinged to the handle (2), the second end of the transmission member (3) is movably connected to the contact support (4), and the moving contact (61) is fixedly connected to the contact support (4); The circuit breaker is configured such that, when the circuit breaker is in closing operation, the handle (2) drives the contact support (4) and the tripping member (5) to rotate through the transmission member (3), the contact support (4) further drives the moving contact (61) to contact the static contact (62) to realize closing, and the second end of the transmission member (3) is locked to the contact support (4) in the closing state; When the circuit breaker is in opening operation, the tripping member (5) performs tripping action to drive the second end of the transmission member (3) to be unlocked from the contact support (4), so that the handle (2), the contact support (4) and the tripping member (5) are reset under the action of the elastic assembly; The elastic assembly comprises a first elastic member (71), a second elastic member (72) and a third elastic member (73); The first elastic member (71) is located between the handle (2) and the shell (1), and is configured to reset the handle (2); The second elastic member (72) comprises a spring body (721), a first elastic arm (722) and a second elastic arm (723); the first elastic arm (722) and the second elastic arm (723) are respectively connected to both ends of the spring body (721) and extend to the same side of the spring body (721); the spring body (721) is connected to the tripping member (5), the first elastic arm (722) abuts against the contact support (4), and the second elastic arm (723) is connected to the second end of the transmission member (3) to make the second end of the transmission member (3) always abut against the contact support (4); The third elastic member (73) is located between the contact support (4) and the shell (1), and is configured to reset the contact support (4).

2. The circuit breaker of claim 1, wherein, The contact support (4) comprises a support body part (41), a movable connection part (42), a fixed connection part (43) and a first abutting part (44); The support body part (41) is hinged to a rotating shaft (10) provided on the shell (1); The movable connecting part (42) and the first abutting part (44) are both connected with the first end of the support body part (41), and the movable connecting part (42) is further movably connected with the second end of the transmission part (3), and the first abutting part (44) is further abutted with the first elastic arm (722) of the second elastic part (72); The fixed connecting part (43) is connected with the second end of the support body part (41), and the fixed connecting part (43) is further fixedly connected with one end of the movable contact (61).

3. The circuit breaker of claim 2, wherein, The support body part (41) comprises a containing cavity (410), and the tripping part (5) comprises a tripping body part (51), a tripping driving part (52) and a rotation center part (53); The tripping body part (51) has a surrounding cavity (510), and the tripping body part (51) is surrounded outside the contact support (4) through the surrounding cavity (510); The tripping driving part (52) is connected with the first end of the tripping body part (51), and the tripping driving part (52) extends into the containing cavity (410) for driving the second end of the transmission part (3); The rotation center part (53) is connected with the inner side wall of the tripping body part (51), and the rotation center part (53) extends into the containing cavity (410) and is hinged with the rotating shaft (10).

4. The circuit breaker of claim 3, wherein, Each of the walls on both sides of the containing cavity (410) of the support body part (41) is provided with a first connecting hole (411) correspondingly; The rotation center part (53) is provided with a second connecting hole (530); The first connecting hole (411) and the second connecting hole (530) are in communication and are both hinged with the rotating shaft (10).

5. The circuit breaker of claim 4, wherein, The first connecting hole (411) is a waist-shaped hole, and the first connecting hole (411) is configured to allow the contact support (4) to rotate sequentially with the rotating shaft (10) and the contact surface of the movable contact (61) and the static contact (62) as the rotating fulcrum.

6. The circuit breaker of claim 3, wherein, The movable connecting part (42) is groove-shaped, and the movable connecting part (42) is arranged at the first end of the wall on both sides of the containing cavity (410) of the support body part (41) and can lock the second end of the transmission part (3) in the closed state of the circuit breaker; The movable connecting part (42) has a force applying groove wall (420), and the force applying groove wall (420) is configured to always abut with the second end of the transmission part (3).

7. The circuit breaker of claim 3, wherein, The fixed connecting part (43) has a jack (430), and the jack (430) coincides with the central axis of the containing cavity (410), and the jack (430) is fixedly connected with one end of the movable contact (61).

8. The circuit breaker of claim 3, wherein, The first abutting part (44) is arranged at the first end of the outer side wall on the first side of the containing cavity (410) of the support body part (41). The contact support (4) further comprises a second abutting portion (45) arranged on the outer side wall of the support body portion (41) on the second side of the accommodating cavity (410), and the second abutting portion (45) further abuts with one torsional arm of the third elastic member (73).

9. The circuit breaker of claim 2, wherein, The contact support (4) further comprises a first stop portion (46) connected to the first end of the support body portion (41). In the open state of the circuit breaker, the first stop portion (46) is used for abutting with the stop block (101) arranged on the shell (1).

10. The circuit breaker of claim 2, wherein, The contact support (4) further comprises a guide portion (47) connected to the second end of the support body portion (41). The guide portion (47) is used for slidingly cooperating with the guide structure arranged on the shell (1) to make the contact support (4) rotate according to the set rotation track.

11. The circuit breaker of claim 3, wherein, The trip member (5) further comprises a second stop portion (54) connected to the inner side wall of the trip body portion (51). In the open state of the circuit breaker, the second stop portion (54) is used for abutting with the fixed connection portion (43); and, In the closed state of the circuit breaker, the trip driving portion (52) abuts with the second end of the transmission member (3).

12. The circuit breaker of claim 3, wherein, The trip member (5) further comprises a first trigger portion (55) connected to the second end of the trip body portion (51) and a second trigger portion (56) connected to the outer side wall of the trip body portion (51) between the first end and the second end thereof. The functional module further comprises a short-circuit protection member (81) and an overload protection member (82), the short-circuit protection member (81) is configured to push the first trigger portion (55) when the circuit breaker is short-circuited, so that the trip member (5) performs a trip action, and the overload protection member (82) is configured to push the second trigger portion (56) when the circuit breaker is overloaded, so that the trip member (5) performs a trip action.

13. The circuit breaker of claim 3, wherein, The second elastic arm (723) is sleeved on the part of the second end of the transmission member (3) inside the accommodating cavity (410).

14. The circuit breaker of any one of claims 1-13, wherein, The transmission member (3) comprises a first connection segment (31), a transition segment (32) and a second connection segment (33) connected in sequence, and the first connection segment (31) and the second connection segment (33) are located on the same side of the transition segment (32). The first connection segment (31) is hinged to the handle (2), and the second connection segment (33) is movably connected to the contact support (4).

15. The circuit breaker of claim 14, wherein, The second connection segment (33) is a non-cylindrical rod body.

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