Instantaneous protection device and circuit breaker

Abstract

The utility model provides an instantaneous protection device and a circuit breaker. The instantaneous protection device comprises a first shifting piece, a linkage rod and a second shifting piece. The circuit breaker is internally provided with a shell, an electromagnetic assembly and a tripping mechanism, and the electromagnetic assembly moves along a first direction after sensing instantaneous current. The first shifting piece is rotationally connected to the shell and located on the moving track of the electromagnetic assembly. The linkage rod is rotationally connected to the shell, and the linkage rod is located on the rotating track of the first shifting piece. The first shifting piece comprises a first face and a second face which are oppositely arranged, the first face abuts against the electromagnetic assembly, the second face abuts against the linkage rod, and the first shifting piece and the linkage rod are used for achieving linkage of the electromagnetic assembly, the first shifting piece and the linkage rod. The second shifting piece is connected to the shell in a sliding mode, and the second shifting piece is located on the rotating track of the linkage rod. The tripping mechanism is located on the sliding track of the second shifting piece and used for disconnecting the current in the circuit breaker. And the electromagnetic assembly, the instantaneous protection device and the tripping mechanism are linked, so that the tripping mechanism can control the contact assembly to be disconnected in time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic equipment, in particular to a transient protection device and a circuit breaker. BACKGROUND

[0002] The circuit breaker is an electrical protection device, and the circuit breaker includes a tripping mechanism. The tripping mechanism is used to automatically disconnect the circuit when an overload or a short circuit occurs in the circuit, so as to prevent the circuit breaker and external equipment connected to the circuit breaker from being damaged, and to avoid safety accidents such as fire.

[0003] In the related art, there is a problem that the tripping mechanism does not act in time, so that the circuit breaker and the external equipment connected to the circuit breaker are still ablated by partial transient current, which reduces the service life of the circuit breaker. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a transient protection device and a circuit breaker, so that after the electromagnetic assembly senses the transient current, the tripping mechanism can timely control the contact assembly to be disconnected, thereby reducing the possibility of the circuit breaker and the external equipment connected to the circuit breaker being ablated, and improving the service life of the circuit breaker.

[0005] In a first aspect, the present application provides a transient protection device applied to a circuit breaker, which comprises a first toggle, a linkage rod and a second toggle. The circuit breaker has a housing, an electromagnetic assembly and a tripping mechanism. After the electromagnetic assembly senses the transient current, the electromagnetic assembly moves in a first direction. The first direction is the height direction of the circuit breaker. The first toggle is rotationally connected to the housing, and the first toggle is located on the moving track of the electromagnetic assembly. The linkage rod is rotationally connected to the housing, and the linkage rod is located on the rotating track of the first toggle. The first toggle comprises a first surface and a second surface arranged oppositely, the first surface abuts against the electromagnetic assembly, and the second surface abuts against the linkage rod, so as to realize linkage of the electromagnetic assembly, the first toggle and the linkage rod. The second toggle is slidingly connected to the housing, and the second toggle is located on the rotating track of the linkage rod. The tripping mechanism is located on the sliding track of the second toggle, and is used to disconnect the current in the circuit breaker.

[0006] According to the first aspect, the electromagnetic assembly is linked with the first toggle, the first toggle is linked with the linkage rod, the linkage rod is linked with the second toggle, and the second toggle is linked with the tripping mechanism. That is, the electromagnetic assembly, the transient protection device and the tripping mechanism are linked, so that when the electromagnetic assembly senses the transient current in the circuit breaker, the tripping mechanism is driven by the transient protection device to perform a tripping action, so that the tripping mechanism can timely control the contact assembly to be disconnected, thereby reducing the possibility of the circuit breaker and the external equipment connected to the circuit breaker being ablated, and improving the service life of the circuit breaker.

[0007] In a possible design, the shell has a receiving cavity. The thermal element of the circuit breaker is located inside the receiving cavity. The first lever and the linkage rod are both located outside the receiving cavity.

[0008] Based on the description of the above embodiment, the first lever and the linkage rod are both located outside the receiving cavity. On the one hand, the deformation of the first lever can be avoided, so that the timely protection effect of the instantaneous protection device is ensured. On the other hand, the installation is facilitated, and the operator can observe whether the first lever and the tripping rod are installed in place, which is beneficial to subsequent testing and inspection.

[0009] In a possible design, the instantaneous protection device can further include a pre-breaking structure configured to control one of the contact assemblies of the circuit breaker to break in advance. One end of the pre-breaking structure is located on the rotation track of the first lever. The first lever abuts against the pre-breaking structure before the linkage rod abuts against the second lever. The other end of the pre-breaking structure is close to the contact assembly, and the contact assembly is located on the movement track of the other end.

[0010] Based on the description of the above embodiment, the pre-breaking structure is arranged between the contact assembly and the first lever. The first lever abuts against the pre-breaking structure before the linkage rod abuts against the second lever, so that the contact assembly can break before tripping, thereby improving the breaking capacity of the circuit breaker, further reducing the possibility of ablation of the circuit breaker and external equipment connected to the circuit breaker, and improving the service life of the circuit breaker.

[0011] In a possible design, the first lever is provided with a mounting hole. The electromagnetic assembly can include a first connecting rod, which is sleeved in the mounting hole. The first connecting rod is provided with a first step. When the electromagnetic assembly moves in the first direction, the first step abuts against the first surface.

[0012] Based on the description of the above embodiment, the electromagnetic assembly abuts against the first lever through the first step, so that the first lever rotates with the electromagnetic assembly.

[0013] In a possible design, the electromagnetic assembly can include a second connecting rod. The first connecting rod is sleeved on the second connecting rod, or the second connecting rod is sleeved on the first connecting rod. The first connecting rod is provided with a second step, and the second connecting rod is provided with a third step. The second step and the third step are sleeved with a return spring, and the return spring is configured to return the electromagnetic assembly to the initial position. When the electromagnetic assembly moves in the first direction, the return spring is compressed.

[0014] Based on the description of the above embodiment, by setting the reset spring on the electromagnetic assembly, the electromagnetic assembly can automatically return to the initial position after completing the first transient protection, so as to perform the next transient protection, so that the transient protection device can continuously protect the circuit breaker, improve the reliability of the transient protection device, reduce the possibility of ablation of the circuit breaker and the external equipment connected with the circuit breaker, and improve the service life of the circuit breaker.

[0015] In a possible design, the first face is an arc face protruding towards the first step face. The face of the first step face in contact with the first face is a plane.

[0016] Based on the description of the above embodiment, the first face is an arc face protruding towards the first step face. Moreover, the face of the first step face in contact with the first face is a plane, so that the abutting point between the first face and the first step is point-line contact, which can reduce the frequency of the jamming problem of the electromagnetic assembly and the first paddle in the linkage process, thereby improving the reliability of the linkage of the electromagnetic assembly and the first paddle, thereby improving the reliability of the transient protection device, reducing the possibility of ablation of the circuit breaker and the external equipment connected with the circuit breaker, and improving the service life of the circuit breaker.

[0017] In a possible design, the linkage rod is provided with a first protruding structure, and the second face abuts against the first protruding structure. The face of the first protruding structure in contact with the second face is an arc face protruding towards the second face. The second face is a plane.

[0018] Based on the description of the above embodiment, the face of the first protruding structure in contact with the second face is an arc face protruding towards the second face. Moreover, the second face is a plane, so that the abutting between the first protruding structure and the second face is point-line contact, which can reduce the frequency of the jamming problem of the first paddle and the linkage rod in the linkage process, thereby improving the reliability of the linkage of the first paddle and the linkage rod, thereby improving the reliability of the transient protection device, reducing the possibility of ablation of the circuit breaker and the external equipment connected with the circuit breaker, and improving the service life of the circuit breaker.

[0019] In a possible design, the linkage rod is provided with a second protruding structure, and the second paddle abuts against the second protruding structure. The face of the second protruding structure in contact with the second paddle is an arc face protruding towards the second paddle. The face of the second paddle in contact with the second protruding structure is a plane.

[0020] Based on the description of the above embodiment, the side of the second protruding structure in contact with the second toggle is an arc surface protruding towards the second toggle. Moreover, the side of the second toggle in contact with the second protruding structure is a plane, so that the abutment between the second protruding structure and the second toggle is point-line contact, which can reduce the probability of the first toggle and the second toggle being stuck during linkage, thereby improving the reliability of the linkage between the first toggle and the second toggle, improving the reliability of the instantaneous protection device, reducing the possibility of the circuit breaker and the external equipment connected with the circuit breaker being ablated, and prolonging the service life of the circuit breaker.

[0021] In a possible design, the first toggle is provided with a third protruding structure, and the pre-trip structure is in abutment with the third protruding structure. The side of the third protruding structure in contact with the pre-trip structure is an arc surface protruding towards the pre-trip structure. The side of the pre-trip structure in contact with the third protruding structure is a plane.

[0022] Based on the description of the above embodiment, the side of the third protruding structure in contact with the pre-trip structure is an arc surface protruding towards the pre-trip structure. Moreover, the side of the pre-trip structure in contact with the third protruding structure is a plane, so that the abutment between the third protruding structure and the pre-trip structure is point-line contact, which can reduce the probability of the first toggle and the pre-trip structure being stuck during linkage, thereby improving the reliability of the linkage between the first toggle and the pre-trip structure, improving the reliability of the instantaneous protection device, reducing the possibility of the circuit breaker and the external equipment connected with the circuit breaker being ablated, and prolonging the service life of the circuit breaker.

[0023] In a second aspect, the present application provides a circuit breaker, comprising: a housing, a contact assembly, an electromagnetic assembly, a tripping mechanism, and the instantaneous protection device according to any one of the above embodiments. The housing has a receiving cavity. The contact assembly is located inside the receiving cavity and is used to communicate the current in the circuit breaker. The electromagnetic assembly is located inside the receiving cavity and is used to sense the instantaneous current in the circuit breaker. The tripping mechanism is located inside the receiving cavity and is connected with the contact assembly and is used to control the opening and closing of the contact assembly. The instantaneous protection device, the electromagnetic assembly, and the tripping mechanism are linked.

[0024] The circuit breaker provided in the above second aspect has the beneficial effects of the first aspect and the possible implementation manners of the first aspect, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0026] Figure 1 An assembly view of the instantaneous protection device in the embodiment of the present application.

[0027] Figure 2 An assembly view of the instantaneous protection device in the embodiment of the present application. Figure 1 Another view.

[0028] Figure 3 An assembly view of the first dial and the electromagnetic assembly in the embodiment of the present application.

[0029] Figure 4 An assembly view of the instantaneous protection device in the embodiment of the present application. Figure 3 An exploded view of the instantaneous protection device.

[0030] Figure 5 An assembly view of the first dial and the trip bar.

[0031] Figure 6 An assembly view of the instantaneous protection device in the embodiment of the present application. Figure 5 An enlarged view of part B in the embodiment of the present application.

[0032] Figure 7 An assembly view of the trip bar and the second dial.

[0033] Figure 8 An assembly view of the instantaneous protection device in the embodiment of the present application. Figure 7 An enlarged view of part C in the embodiment of the present application.

[0034] Figure 9 An assembly view of the instantaneous protection device in the embodiment of the present application. Figure 2 An enlarged view of part A in the embodiment of the present application.

[0035] Figure 10 An exploded view of the instantaneous protection device. Figure 5 An exploded view of the instantaneous protection device.

[0036] BRIEF DESCRIPTION OF THE DRAWINGS

[0037] 1-instantaneous protection device; 11-first dial; 11a-first surface; 11b-second surface; 111-third protruding structure; 112-mounting hole; 113-first rotation axis; 12-linkage bar; 121-first protruding structure; 122-second protruding structure; 123-second rotation axis; 13-second dial; 14-pre-break structure;

[0038] 2-housing; 21-sliding groove;

[0039] 3-electromagnetic assembly; 31-first connecting rod; 311-first step; 312-second step; 32-second connecting rod; 321-third step; 33-return spring;

[0040] X-first direction. DETAILED DESCRIPTION

[0041] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application.

[0043] The terms "comprise", "have" and any variations thereof in the specification and claims of the present application and the accompanying drawings are intended to cover but not exclude other content. The word "one" or "a" does not exclude the presence of more than one.

[0044] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. A person of ordinary skill in the art will understand that the embodiments described herein can be combined with one another.

[0045] The term "and / or" in the present application is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0046] The orientation words appearing in the following description are the directions shown in the drawings, and are not limited to the specific structure of the present application. For example, in the description of the present application, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0047] In addition, the expressions of the directions for explaining the operation and the configuration of the components of the embodiment, such as the X direction, the Y direction, and the Z direction, are not absolute but relative, and although the directions are appropriate when the components are in the positions shown in the drawings, the directions should be interpreted differently when the positions are changed to correspond to the change.

[0048] In addition, the terms "first", "second", and the like in the description and claims of the present application or the above drawings are used to distinguish different objects, and are not used to describe a particular order, and can explicitly or implicitly include one or more of the features.

[0049] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more (including two), and similarly, "a plurality of groups" means two or more groups (including two groups).

[0050] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", and "connection" should be understood broadly, for example, the "connection" or "connection" of the mechanical structure can mean a physical connection, for example, the physical connection can be a fixed connection, for example, a fixed connection by a fixing member, for example, a fixed connection by a screw, bolt or other fixing member; the physical connection can also be a detachable connection, for example, a mutual clamping or clamping connection; the physical connection can also be integrally connected, for example, welded, bonded or integrally formed to form a connection for connection. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] The circuit breaker provided by the present application can include a housing, a contact assembly, an electromagnetic assembly and a trip mechanism.

[0052] The housing has a receiving cavity.

[0053] The contact assembly is located inside the receiving cavity and is used to communicate the current in the circuit breaker.

[0054] The electromagnetic assembly is located inside the receiving cavity and is used to sense the transient current in the circuit breaker.

[0055] The trip mechanism is located inside the receiving cavity, and the trip mechanism is connected with the contact assembly and is used to control the opening and closing of the contact assembly. When the electromagnetic assembly senses that there is a transient current in the circuit breaker, the trip mechanism controls the opening of the contact assembly, thereby breaking the flow of current in the circuit breaker, so as to protect the circuit breaker and the external equipment connected with the circuit breaker from the ablation of the transient current.

[0056] In the related art, there is a problem that the tripping mechanism controls the contact assembly to break not timely, thereby causing the circuit breaker and external devices connected with the circuit breaker to be still ablated by partial transient current, reducing the service life of the circuit breaker.

[0057] Therefore, the application provides a transient protection device, which is linked with the electromagnetic assembly and the tripping mechanism to enable the tripping mechanism to timely control the contact assembly to break after the electromagnetic assembly senses the transient current, thereby reducing the possibility that the circuit breaker and external devices connected with the circuit breaker are ablated and improving the service life of the circuit breaker. The application will be described in detail below in combination with Figures 1-10 specific embodiments.

[0058] As Figures 1-8 shown, the application provides a transient protection device 1 applied to a circuit breaker, which can include a first toggle plate 11, a linkage rod 12 and a second toggle plate 13. The circuit breaker has a housing 2, an electromagnetic assembly 3 and a tripping mechanism (not shown in the figure), and the electromagnetic assembly 3 moves in a first direction X after sensing the transient current. The first direction X is the height direction of the circuit breaker. The first toggle plate 11 is rotationally connected to the housing 2, and the first toggle plate 11 is located on the movement track of the electromagnetic assembly 3. The linkage rod 12 is rotationally connected to the housing 2, and the linkage rod 12 is located on the rotation track of the first toggle plate 11. The first toggle plate 11 includes oppositely arranged first and second faces 11a and 11b, the first face 11a abuts against the electromagnetic assembly 3, and the second face 11b abuts against the linkage rod 12, so as to realize linkage of the electromagnetic assembly 3, the first toggle plate 11 and the linkage rod 12. The second toggle plate 13 is slidingly connected to the housing 2, and the second toggle plate 13 is located on the rotation track of the linkage rod 12. The tripping mechanism is located on the sliding track of the second toggle plate 13, and is used to break the current in the circuit breaker.

[0059] The electromagnetic assembly 3 is used to sense the transient current in the circuit breaker. As Figure 2 shown, when the transient current exists in the circuit breaker, the attraction force of the magnetic field causes the electromagnetic assembly 3 to quickly move in the first direction X.

[0060] As Figure 1 shown, the transient protection device 1 can include the first toggle plate 11, the linkage rod 12 and the second toggle plate 13.

[0061] The first toggle plate 11 is rotationally connected to the housing 2 of the circuit breaker. For example, as Figure 3 shown, the first toggle plate 11 can be rotationally connected in the circuit breaker through a first rotation shaft 113.

[0062] The first toggle plate 11 is arranged on the action track of the electromagnetic assembly 3, and as Figure 3 and Figure 4As shown, the first face 11a of the first dial 11 abuts against the electromagnetic assembly 3. When the electromagnetic assembly 3 moves in the first direction X until abutting against the first face 11a, the first dial 11 rotates in the circuit breaker to realize the linkage between the electromagnetic assembly 3 and the first dial 11. Here, the first face 11a of the first dial 11 is the face facing the electromagnetic assembly 3.

[0063] As shown, the linkage lever 12 can be rotatably connected in the circuit breaker through a second rotation shaft 123. Figure 5

[0064] As shown, the second face 11b of the first dial 11 abuts against the linkage lever 12. When the first dial 11 rotates with the electromagnetic assembly 3 until the second face 11b abuts against the linkage lever 12, the linkage lever 12 rotates in the circuit breaker to realize the linkage between the linkage lever 12 and the first dial 11. Here, the second face 11b of the first dial 11 is the face facing the linkage lever 12. Figure 5 Figure 6

[0065] As shown, the second dial 13 is slidably connected to the housing 2 of the circuit breaker. For example, the second dial 13 can be a sliding block, and the housing 2 can be provided with a sliding groove 21 slidably connected to the sliding block, so that the second dial 13 can slide along the length direction of the sliding groove 21. Figure 7 Figure 8

[0066] The second dial 13 is arranged on the rotation track of the linkage lever 12. When the linkage lever 12 rotates with the first dial 11 until the linkage lever 12 abuts against the second dial 13, the second dial 13 slides in the sliding groove 21 to realize the linkage between the second dial 13 and the linkage lever 12.

[0067] The trip mechanism is used to break the contact assembly (not shown in the figure) in the circuit breaker, so as to break the current flow in the circuit breaker, so as to protect the circuit breaker and the external equipment connected to the circuit breaker from the ablation of transient current.

[0068] The trip mechanism is arranged on the sliding track of the second dial 13. When the second dial 13 slides in the sliding groove 21 with the linkage lever 12 until the second dial 13 abuts against the trip mechanism, the trip mechanism performs a trip action to realize the linkage between the trip mechanism and the second dial 13.

[0069] ​​​​​In summary, the electromagnetic assembly 3 is linked with the first dial 11, the first dial 11 is linked with the linkage rod 12, the linkage rod 12 is linked with the second dial 13, and the second dial 13 is linked with the tripping mechanism. That is, the electromagnetic assembly 3, the instantaneous protection device 1, and the tripping mechanism are linked, so that the electromagnetic assembly 3 can drive the tripping mechanism to perform a tripping action through the instantaneous protection device 1 when the electromagnetic assembly 3 senses the existence of the instantaneous current in the circuit breaker, so that the tripping mechanism can timely control the contact assembly to be disconnected, reduce the possibility of the circuit breaker and the external equipment connected with the circuit breaker being ablated, and improve the service life of the circuit breaker.

[0070] Further, the circuit breaker can further include a thermal element, which can be a bimetallic strip. After being heated, the bimetallic strip is linked with the tripping mechanism, so that the tripping mechanism controls the contact assembly to be disconnected, avoids the circuit breaker being in a thermal overload state for a long time, and improves the service life of the circuit breaker.

[0071] Based on this, in some embodiments, the shell 2 has a containing cavity. The thermal element (not shown in the figure) of the circuit breaker is located inside the containing cavity. The first dial 11 and the linkage rod 12 are both located outside the containing cavity.

[0072] The first dial 11 can be made of a thermoplastic material. The thermoplastic material is easily deformed after being heated. After the first dial 11 is deformed, the contact position of the first dial 11 and the linkage rod 12 is changed, thereby affecting the timely protection effect of the instantaneous protection device 1.

[0073] Based on this, the first dial 11 is arranged outside the containing cavity, and the thermal element located inside the containing cavity, so as to reduce the influence of the heating of the thermal element on the first dial 11 and avoid the deformation of the first dial 11.

[0074] In addition, after the electromagnetic assembly 3 and the thermal element are installed, the first dial 11 and the tripping rod can be independently installed outside the containing cavity and rotationally connected to the shell 2, which is convenient for installation and also facilitates the observation by the operator whether the first dial 11 and the tripping rod are installed in place, and is conducive to subsequent testing and inspection.

[0075] According to the above description of the embodiments, the first dial 11 and the linkage rod 12 are both arranged outside the containing cavity. On the one hand, the deformation of the first dial 11 can be avoided, thereby ensuring the timely protection effect of the instantaneous protection device 1. On the other hand, the installation is facilitated, and the observation by the operator whether the first dial 11 and the tripping rod are installed in place is facilitated, which is conducive to subsequent testing and inspection.

[0076] Further, the circuit breaker provided by the application can be a multi-phase circuit breaker, which can include multiple sets of contact assemblies, each of which can independently control the on-off of the current in each phase. Each contact assembly is provided with an electromagnetic assembly 3. Correspondingly, each electromagnetic assembly 3 corresponds to a first toggle plate 11. For example, a three-phase circuit breaker includes three contact assemblies. Correspondingly, the circuit breaker includes three electromagnetic assemblies 3 and three first toggle plates 11. Moreover, the three first toggle plates 11 can all abut against the linkage rod 12. That is, when any one of the first toggle plates 11 rotates until it abuts against the linkage rod 12, it will drive the linkage rod 12 to rotate, so as to make the tripping mechanism perform a tripping action. According to the above content, when there is a transient current in a phase of the multi-phase circuit breaker, the tripping mechanism will perform a tripping action to protect the circuit breaker and external equipment connected to the circuit breaker from being ablated by the transient current.

[0077] Based on this, in some embodiments, as shown in Figure 1 and Figure 9 The transient protection device 1 can also include a pre-breaking structure 14 for controlling one of the contact assemblies in the circuit breaker to perform a pre-breaking. One end of the pre-breaking structure 14 is located on the rotation track of the first toggle plate 11. Before the linkage rod 12 abuts against the second toggle plate 13, the first toggle plate 11 abuts against the pre-breaking structure 14. The other end of the pre-breaking structure 14 is close to the contact assembly, and the contact assembly is located on the movement track of the other end.

[0078] Among the contact assemblies, there is a transient current, and the breaking action of the pre-breaking structure 14 occurs before the tripping action of the tripping mechanism.

[0079] Further, for a multi-phase circuit breaker, the transient protection device 1 can include multiple pre-breaking structures 14, which correspond to the multiple contact assemblies one by one, so that each contact assembly in the circuit breaker can perform a breaking action before tripping, so as to improve the breaking capacity of the circuit breaker. For example, a three-phase circuit breaker can include three pre-breaking structures 14, which correspond to the three contact assemblies one by one.

[0080] Among the contact assemblies, there is a transient current, and the breaking action of the pre-breaking structure 14 occurs before the tripping action of the tripping mechanism.

[0081] When the first toggle 11 rotates, the first toggle 11 first abuts against the linkage rod 12, so that the linkage rod starts to rotate. Before the linkage rod 12 abuts against the second toggle 13, the first toggle 11 abuts against the linkage structure, so that the pre-breaking structure 14 performs the pre-breaking action in priority.

[0082] Specifically, the first toggle 11 can include a first contact point and a second contact point. When the first toggle 11 rotates, the linkage rod 12 is located on a rotation track of the first contact point, and the linkage structure is located on a movement track of the second contact point. The first contact point abuts against the linkage rod 12 in priority, so that the linkage rod 12 rotates. At this time, the linkage rod 12 needs to rotate for a first time length, so that the linkage rod 12 abuts against the second toggle 13. The first toggle 11 needs to rotate for a second time length, so that the second contact point abuts against the linkage structure. The second time length is shorter than the first time length, so that the pre-breaking structure 14 performs the pre-breaking action in priority, and the tripping mechanism performs the tripping action in priority.

[0083] According to the above description of the embodiments, the pre-breaking structure 14 is arranged between the contact assembly and the first toggle 11. Before the linkage rod 12 abuts against the second toggle 13, the first toggle 11 abuts against the pre-breaking structure 14, so that the contact assembly can perform the breaking action before tripping, thereby improving the breaking capacity of the circuit breaker, further reducing the possibility of ablation of the circuit breaker and external equipment connected with the circuit breaker, and improving the service life of the circuit breaker.

[0084] The specific structure of the electromagnetic assembly 3, the instantaneous protection device 1 and the pre-breaking structure 14 will be described below with reference to the accompanying drawings. Figures 3-10 The specific structure of the electromagnetic assembly 3, the instantaneous protection device 1 and the pre-breaking structure 14 will be described below with reference to the accompanying drawings.

[0085] In some embodiments, as shown in FIGS. 1 and 2, the first toggle 11 can include a first face 11a and a second face 11b. The first face 11a is arranged on the first toggle 11 and faces the first direction X. The second face 11b is arranged on the first toggle 11 and faces the second direction Y. Figure 3 and Figure 4 As shown in FIGS. 1 and 2, the first toggle 11 is provided with a mounting hole 112. The electromagnetic assembly 3 can include a first linkage rod 31, and the first linkage rod 31 is sleeved in the mounting hole 112. The first linkage rod 31 is provided with a first step 311. When the electromagnetic assembly 3 moves in the first direction X, the first step 311 abuts against the first face 11a.

[0086] The first step 311 can be a block structure, so that the edge of the first step 311 protrudes from the edge of the first linkage rod 31, so that the first step 311 cannot enter the mounting hole 112 and abuts against the first face 11a. The block structure can include various shapes, such as a cylinder, a cube, a prism, etc., which are not limited in the present application.

[0087] The first step 311 can be connected to one end of the first linkage rod 31. Specifically, the connection mode of the first step 311 and the first linkage rod 31 can include but is not limited to the following two modes:

[0088] In a first mode, the first step 311 is detachably connected to the first connecting rod 31. The detachable connection can include screwing, riveting, clamping and other connection modes, which are not limited in the present application.

[0089] In a second mode, the first step 311 is fixedly connected to the first connecting rod 31. The fixed connection can be one-piece casting, welding and other connection modes, which are not limited in the present application.

[0090] When the electromagnetic assembly 3 moves in the first direction X, the first connecting rod 31 slides in the mounting hole 112 until the first step 311 abuts against the first face 11a of the first toggle piece 11, so that the first toggle piece 11 rotates with the electromagnetic assembly 3.

[0091] According to the above description of the embodiments, the electromagnetic assembly 3 is abutted against the first toggle piece 11 through the first step 311, so that the first toggle piece 11 rotates with the electromagnetic assembly 3.

[0092] Further, in some embodiments, the first face 11a is an arc face protruding towards the first step 311. One face of the first step 311 in contact with the first face 11a is a flat face.

[0093] According to the above description of the embodiments, the first face 11a is an arc face protruding towards the first step 311. One face of the first step 311 in contact with the first face 11a is a flat face, so that the abutting point between the first face 11a and the first step 311 is a point line contact, which can reduce the frequency of the jamming problem of the electromagnetic assembly 3 and the first toggle piece 11 in the linkage process, thereby improving the reliability of the linkage of the electromagnetic assembly 3 and the first toggle piece 11, improving the reliability of the instantaneous protection device 1, reducing the possibility of ablation of the circuit breaker and external equipment connected thereto, and prolonging the service life of the circuit breaker.

[0094] In some embodiments, as shown in Figure 3 and Figure 4 The electromagnetic assembly 3 can include a second connecting rod 32. The first connecting rod 31 is sleeved on the second connecting rod 32, or the second connecting rod 32 is sleeved on the first connecting rod 31. The first connecting rod 31 is provided with a second step 312, and the second connecting rod 32 is provided with a third step 321. The second step 312 and the third step 321 are sleeved with a reset spring 33, which is used to return the electromagnetic assembly 3 to the initial position. When the electromagnetic assembly 3 moves in the first direction X, the reset spring 33 is compressed.

[0095] The first connecting rod 31 is sleeved on the second connecting rod 32, or the second connecting rod 32 is sleeved on the first connecting rod 31, so that the first connecting rod 31 and the second connecting rod 32 can slide relative to each other in the first direction X. The second step 312 is arranged on the first connecting rod 31, and the third step 321 is arranged on the second connecting rod 32. When the first connecting rod 31 slides relative to the second connecting rod 32, the distance between the second step 312 and the third step 321 can change.

[0096] One end of the reset spring 33 abuts against the second step 312, and the other end of the reset spring 33 abuts against the third step 321. When the electromagnetic assembly 3 moves in the first direction X, the distance between the second step 312 and the third step 321 changes, and the reset spring 33 is compressed, so that the reset spring 33 has a reset force. The reset force is opposite to the direction of the attraction force of the magnetic field.

[0097] When the transient current in the circuit breaker disappears, the electromagnetic assembly 3 loses the above-mentioned attraction force. At this time, the reset force of the reset spring 33 makes the first connecting rod 31 slide relative to the second connecting rod 32, so that the electromagnetic assembly 3 automatically returns to the initial position. Until the electromagnetic assembly 3 senses the next transient current, the attraction force of the magnetic field caused by the transient current can make the electromagnetic assembly 3 move again in the first direction X, and the transient protection device 1 and the trip mechanism control the contact assembly to be disconnected, thereby reducing the possibility of the circuit breaker and the external equipment connected with the circuit breaker being ablated, and prolonging the service life of the circuit breaker. The initial position refers to the position of the electromagnetic assembly 3 in the circuit breaker when there is no transient current in the circuit breaker.

[0098] According to the above-mentioned embodiment, by arranging the reset spring 33 on the electromagnetic assembly 3, the electromagnetic assembly 3 can automatically return to the initial position after completing the transient protection once, so as to perform the next transient protection, thereby making the transient protection device 1 continuously protect the circuit breaker, improving the reliability of the transient protection device 1, reducing the possibility of the circuit breaker and the external equipment connected with the circuit breaker being ablated, and prolonging the service life of the circuit breaker.

[0099] In some embodiments, as shown in Figs. 1 to 3, the linkage rod 12 is arranged on the second surface 11b of the base 11. Figure 5 and Figure 6 As shown in Figs. 1 to 3, the linkage rod 12 is arranged on the second surface 11b of the base 11. The first protruding structure 121 is arranged on the linkage rod 12, and the second surface 11b abuts against the first protruding structure 121. The side of the first protruding structure 121 in contact with the second surface 11b is an arc surface protruding towards the second surface 11b. The second surface 11b is a plane.

[0100] The first protruding structure 121 can be a block structure, which can include various shapes, such as a cylinder, a cube, a prism, etc., which are not limited in the present application.

[0101] The connection mode of the first protruding structure 121 and the linkage rod 12 can include but is not limited to the following two modes:

[0102] In mode one, the first protruding structure 121 is detachably connected to the linkage rod 12. The detachable connection can include various connection modes such as screwing, riveting, and clamping, and the present application does not make specific limitations on this.

[0103] In mode two, the first protruding structure 121 is fixedly connected to the linkage rod 12. The fixed connection mode can be various connection modes such as one-piece casting and welding, and the present application does not make specific limitations on this.

[0104] According to the description of the above embodiments, the side of the first protruding structure 121 in contact with the second surface 11b is an arc surface protruding towards the second surface 11b. And the second surface 11b is a plane, so that the abutment between the first protruding structure 121 and the second surface 11b is a point-line contact, which can reduce the frequency of the first paddle 11 and the linkage rod 12 in the linkage process. The problem of jamming, thereby improving the reliability of the linkage between the first paddle 11 and the linkage rod 12, thereby improving the reliability of the instantaneous protection device 1, reducing the possibility of ablation of the circuit breaker and the external equipment connected to the circuit breaker, and improving the service life of the circuit breaker.

[0105] In some embodiments, as shown in Figure 7 and Figure 8 The linkage rod 12 is provided with a second protruding structure 122, and the second paddle 13 abuts against the second protruding structure 122. The side of the second protruding structure 122 in contact with the second paddle 13 is an arc surface protruding towards the second paddle 13. The side of the second paddle 13 in contact with the second protruding structure 122 is a plane.

[0106] The second protruding structure 122 can be a block structure, which can include various shapes such as a cylinder, a cube, a prism, etc., and the present application does not make specific limitations.

[0107] The connection mode of the second protruding structure 122 and the linkage rod 12 can include but is not limited to the following two modes:

[0108] In mode one, the second protruding structure 122 is detachably connected to the linkage rod 12. The detachable connection can include various connection modes such as screwing, riveting, and clamping, and the present application does not make specific limitations on this.

[0109] In mode two, the second protruding structure 122 is fixedly connected to the linkage rod 12. The fixed connection mode can be various connection modes such as one-piece casting and welding, and the present application does not make specific limitations on this.

[0110] According to the description of the above embodiment, the side of the second protruding structure 122 in contact with the second paddle 13 is an arc surface protruding towards the second paddle 13. Moreover, the side of the second paddle 13 in contact with the second protruding structure 122 is a flat surface, so that the abutment between the second protruding structure 122 and the second paddle 13 is point-line contact, which can reduce the probability of the linkage rod 12 and the second paddle 13 being stuck during linkage, thereby improving the reliability of the linkage between the linkage rod 12 and the second paddle 13, improving the reliability of the instantaneous protection device 1, reducing the possibility of the circuit breaker and the external equipment connected to the circuit breaker being ablated, and prolonging the service life of the circuit breaker.

[0111] In some embodiments, as shown in FIG. 1, the first paddle 11 is provided with a third protruding structure 111, and the pre-break structure 14 is in abutment with the third protruding structure 111. Figure 9 The side of the third protruding structure 111 in contact with the pre-break structure 14 is an arc surface protruding towards the pre-break structure 14. The side of the pre-break structure 14 in contact with the third protruding structure 111 is a flat surface.

[0112] The third protruding structure 111 can be a block structure, which can include various shapes such as a cylinder, a cube, a prism, etc., and the present application does not make specific limitations.

[0113] The connection mode of the third protruding structure 111 with the first paddle 11 can include but is not limited to the following two modes:

[0114] Mode one, the third protruding structure 111 is detachably connected to the first paddle 11. The detachable connection can include various connection modes such as screwing, riveting and clamping, and the present application does not make specific limitations.

[0115] Mode two, the third protruding structure 111 is fixedly connected to the first paddle 11. The fixed connection mode can be various connection modes such as one-piece casting and welding, and the present application does not make specific limitations.

[0116] According to the description of the above embodiment, the side of the third protruding structure 111 in contact with the pre-break structure 14 is an arc surface protruding towards the pre-break structure 14. Moreover, the side of the pre-break structure 14 in contact with the third protruding structure 111 is a flat surface, so that the abutment between the third protruding structure 111 and the pre-break structure 14 is point-line contact, which can reduce the probability of the first paddle 11 and the pre-break structure 14 being stuck during linkage, thereby improving the reliability of the linkage between the first paddle 11 and the pre-break structure 14, improving the reliability of the instantaneous protection device 1, reducing the possibility of the circuit breaker and the external equipment connected to the circuit breaker being ablated, and prolonging the service life of the circuit breaker.

[0117] Based on the above description, in some embodiments, as shown in FIG. 1, the first paddle 11 is provided with a third protruding structure 111, and the pre-break structure 14 is in abutment with the third protruding structure 111. Figure 10As shown, the first protruding structure 121 can include two structure blocks, and there is a gap between the two structure blocks, and the size of the gap can accommodate the third protruding structure 111, so as to prevent the first protruding structure 121 from interfering with the third protruding structure 111 when the first knob 11 rotates.

[0118] Those skilled in the art will appreciate that a combination of features of different embodiments means that it is within the scope of the application and forms a different embodiment, although some embodiments herein include certain features rather than others included in other embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0119] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An instantaneous protection device, applied to a circuit breaker, characterized in that: include: a first paddle, a linkage lever, and a second paddle; The circuit breaker comprises a housing, an electromagnetic assembly and a tripping mechanism, wherein the electromagnetic assembly moves in a first direction after sensing a transient current; Wherein, the first direction is the height direction of the circuit breaker; The first paddle is rotatably connected to the housing, and the first paddle is located on a moving track of the electromagnetic assembly; The linkage rod is rotatably connected to the housing, and the linkage rod is located on the rotation track of the first paddle; The first paddle includes a first surface and a second surface that are oppositely disposed, the first surface abuts against the electromagnetic assembly, and the second surface abuts against the linkage rod, for realizing linkage between the electromagnetic assembly, the first paddle, and the linkage rod; The second paddle is slidably connected to the housing, and the second paddle is located on the rotation track of the linkage rod; The tripping mechanism is located on the sliding track of the second paddle and is used to disconnect the current in the circuit breaker.

2. The instantaneous protection device according to claim 1, characterized in that: The housing has a receiving cavity; The thermal element of the circuit breaker is located inside the accommodating cavity; The first paddle and the linkage rod are both located outside the accommodating cavity.

3. The instantaneous protection device according to claim 1, characterized in that: It also includes a pre-breaking structure, which is used to control a contact assembly in the circuit breaker to break in advance; One end of the pre-splitting structure is located on the rotation track of the first paddle; Before the linkage rod abuts against the second paddle, the first paddle abuts against the pre-breaking structure; The other end of the pre-breaking structure is close to the contact assembly, and the contact assembly is located on a moving track of the other end.

4. The instantaneous protection device according to claim 1, characterized in that: The first paddle is provided with a mounting hole; The electromagnetic assembly includes a first connecting rod, and the first connecting rod is sleeved in the mounting hole; The first connecting rod is provided with a first step; When the electromagnetic assembly moves in the first direction, the first step abuts against the first surface.

5. The instantaneous protection device according to claim 4, characterized in that: The electromagnetic assembly includes a second connecting rod; The first connecting rod is sleeved on the second connecting rod; Alternatively, the second connecting rod is sleeved on the first connecting rod; The first connecting rod is provided with a second step, and the second connecting rod is provided with a third step; A return spring is provided between the second step and the third step, and the return spring is used to return the electromagnetic assembly to an initial position; When the electromagnetic assembly moves in the first direction, the return spring is compressed.

6. The instantaneous protection device according to claim 4, characterized in that: The first surface is a curved surface convex toward the first step surface; A surface of the first step that contacts the first surface is a plane.

7. The instantaneous protection device according to claim 1, characterized in that: The linkage rod is provided with a first protrusion structure; The second surface abuts against the first protruding structure; The surface of the first protruding structure in contact with the second surface is a curved surface protruding toward the second surface; The second surface is a plane.

8. The instantaneous protection device according to claim 1, characterized in that: The linkage rod is provided with a second protrusion structure; The second paddle abuts against the second protruding structure; A surface of the second protrusion structure in contact with the second paddle is a curved surface protruding toward the second paddle; A surface of the second paddle in contact with the second protruding structure is a plane.

9. The instantaneous protection device according to claim 3, characterized in that: A third protrusion structure is provided on the first paddle; The pre-severing structure abuts against the third protruding structure; The surface of the third protruding structure in contact with the pre-splitting structure is a curved surface protruding toward the pre-splitting structure; A surface of the pre-severing structure in contact with the third protruding structure is a plane.

10. A circuit breaker, characterized in that: include: A housing, a contact assembly, an electromagnetic assembly, a tripping mechanism, and an instantaneous protection device according to any one of claims 1 to 9; The housing has a receiving cavity; The contact assembly is located inside the accommodating cavity and is used to connect the current in the circuit breaker; The electromagnetic assembly is located inside the accommodating cavity and is used to sense the instantaneous current in the circuit breaker; The tripping mechanism is located inside the accommodating cavity and is connected to the contact assembly for controlling the opening and closing of the contact assembly; The instantaneous protection device, the electromagnetic assembly and the tripping mechanism are linked together.

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