AU2022399749A1 - Circuit breaker - Google Patents

Abstract

A circuit breaker, comprising a housing, a handle, a first connecting rod, a jump fastener, a latch fastener, a second connecting rod, a lever, a movable contact and a stationary contact. The jump fastener and the latch fastener are respectively pivotally mounted on the housing; the jump fastener is provided with a sliding groove, and a jump fastener buckle-fitting portion for being buckle-fitted with a buckle platform of the latch fastener; the handle is pivotally mounted on the housing, one end of the first connecting rod is connected to the handle, the other end of the first connecting rod is hinged to one end of the second connecting rod, the other end of the second connecting rod is connected to the lever, and the end where the first connecting rod and the second connecting rod are hinged to each other are in sliding fit with the sliding groove of the jump fastener; and the lever is pivotally mounted on the housing, one end of the movable contact is mounted on the lever, and the other end of the movable contact is arranged corresponding to the stationary contact. By means of the present invention, a circuit breaker having a compact and small structure and having a high operational reliability is provided.

Description

CIRCUITBREAKER

TECHNICAL FIELD The present invention relates to the field of low-voltage electrical appliances, in particular to a circuit breaker.

BACKGROUNDART With economic development, miniaturization and intelligence have become the trend in the development of low-voltage electrical components, and it is expected that electrical products can have a variety of functions in the volume as small as possible, so as to enable application in different conditions. The operating mechanism is the most basic functional module inside the electrical product, occupying a quite large space in proportion within the structural layout of the entire electrical product, therefor, to miniaturize the operating mechanism and make it compact is a main direction to realize the miniaturization and intelligence of electrical products. The existing circuit breaker products mostly adopt an operating mechanism with four-bar linkage, which decentralizes the arrangement of components and segments the limited space into fragments, so they cannot be effectively utilized, limiting the multi-functional development of products. For an overload system of a small circuit breaker, typically a bimetallic strip bends by heat to drive an operating mechanism to trip and disconnect the circuit, specifically, of the bimetallic strip one end is fixed, and the other end bends by heat and drives the lock buckle of the operating mechanism to turn by means of a drawbar, so as to release its locking fit with a jump buckle; the entire overload system occupies a large space, resulting in shortage of space inside the circuit breaker.

SUMMARY OF THE INVENTION The objective of the present invention is to overcome the shortcomings of the prior art, providing a circuit breaker with compact structure and high operational reliability. In order to achieve the above object, the technical scheme adopted in the present invention is as follows: A circuit breaker, comprising a housing, a handle, a first connecting rod, a jump buckle, a lock buckle, a second connecting rod, a lever, a moving contact and a stationary contact, wherein the jump buckle and the lock buckle are respectively pivotally installed on the housing, the jump buckle is provided with a sliding groove and a jump buckle-catching portion for catching the buckle boss of the lock buckle; the handle is pivotally installed on the housing, of the first connecting rod one end is connected with the handle, the other end articulates with one end of the second connecting rod, the other end of the second connecting rod is connected with the lever, and the articulated end of the first connecting rod and the second connecting rod slidingly cooperates with the sliding groove of the jump buckle; the lever is pivotally installed on the housing, of the moving contact one end is installed on the lever, and the other end is arranged opposite the stationary contact. Further, the handle is rotationally installed by means of a first rotational shaft, the lock buckle is rotationally installed by means of a third rotational shaft, of the jump buckle one end is rotationally installed by means of a second rotational shaft, the catching edge of the other end meshes with the lock buckle, the first rotational shaft, the third rotational shaft and the second rotational shaft are positioned at three vertices of an obtuse triangle, among them the first rotational shaft is positioned at the obtuse vertex of the obtuse triangle. Further, one end of the jump buckle is rotationally installed, the other end is provided with a jump buckle-catching portion that locking with the lock buckle, the sliding groove is arranged between the rotating axis of the jump buckle and the jump buckle-catching portion, of the lock buckle one end is rotationally installed, and the other end is provided with a trip-driving portion for triggering a trip, the lock buckle is provided with a sliding surface slidingly cooperating with the jump buckle-catching portion of the jump buckle, the raised buckle boss locking with the jump buckle-catching portion is arranged on the sliding surface. Further, the lock buckle is disposed on the same rotational shaft with the lever, which rotationally sleeves the third rotational shaft of the housing through a third shaft hole on it, a lever elastic part used to reset the lever is arranged between the lever and the housing, the lock buckle rotationally sleeves the third rotational shaft of the housing through a fourth shaft hole on it, and a lock buckle-elastic part used to reset the lock buckle is arranged between the lock buckle and the housing. Further, when the circuit breaker is in a switch-on state, the pressure borne by the sliding groove of the jump buckle under the action of the articulated end of the first connecting rod and the second connecting rod is F1, and its arm of force is L1, while the positive pressure borne by the jump buckle-catching portion of the jump buckle under the action of the buckle boss of the lock buckle is F2, and its arm of force is L2, the length ratio of the arm of force Li to the arm of force L2 is less than 1/4. Further, the jump buckle comprises a jump buckle-turning portion, a sliding groove segment and a jump buckle-catching arm, which are connected with each other in proper order, the jump buckle-turning portion is provided with a second shaft hole, the sliding groove segment is provided with a sliding groove, a raised buckle hook is disposed on the corner of the end of the jump buckle-catching arm, a raised sliding arc surface slidingly fitting with the lock buckle is arranged on the end face of the jump buckle-catching arm, the junction of the sliding arc surface and the buckle hook is the catching edge that can catch the buckle boss of the lock buckle. Further, the line connecting the rotating axis of the jump buckle to the sliding arc surface via the center 0 of the sliding arc surface is L3, the line connecting the rotating axis of the jump buckle to the catching edge is L4, an angle a is formed between L3 and L4, a is an acute angle, the length of L3 is greater than the length of L4. Further, one end of the lock buckle is provided with a fourth shaft hole, the bottom surface of the other end is provided with the trip-driving portion protruding downwards; a lock buckle protrusion proruding downwards is arranged at the bottom surface of the middle of the lock buckle close to the fourth shaft hole, a dodging groove dodging the second connecting rod is formed between the lock buckle protrusion and the trip-driving portion, a guiding protrusion protruding sidewards is arranged the lock buckle protrusion, acting as a sliding surface cooperating with the jump buckle, the buckle boss locking with the jump buckle is disposed on the side of the lock buckle protrusion, the guiding protrusion is arranged at intervals with the bottom surface of the lock buckle. Further, an interacting shaft protruding downwards is arranged on the bottom surface of the lock buckle, an interacting groove is arranged at the position of the top surface of the lock buckle corresponding to the interacting shaft.

Further, the second connecting rod comprises two connecting rod pieces and two connecting ribs connected between the two connecting rod pieces, a sticking gap for dodging the jump buckle and/or the lock buckle is arranged between the two connecting rod pieces , of the two connecting rod pieces one end is aligned with each other, and provided with a second articulation hole for articulating with the first connecting rod, and the other end is aligned with each other, and provided with a third articulation hole for articulating with the lever. Further, the moving contact is pivotally installed on the lever, the moving contact is rotationally connected on the lever, a third torsion spring is arranged at the pivotal connection between the moving contact and the lever, of the third torsion spring one end abuts against the lever, and the other end abuts against the moving contact. Further, the moving contact is provided with a stopping protrusion, and a stopping boss corresponding to the stopping protrusion is disposed on the lever. Further, the lever comprises a lever plate and a supporting boss disposed on the lever plate, a fourth rotational shaft used to pivotally install the moving contact is disposed on the supporting boss; one corner of the lever plate extends outwards to form an extending portion, of the position connecting the extending portion with the lever plate one side is provided with a position-restricting bevel cooperating with a position-restricting post of the housing, and the other side is provided with a fourth articulation hole used to articulate with the second connecting rod; the end of the extending portion is provided with a third shaft hole used to pivotally install the lever. Further, the first connecting rod is a U-shaped rod, of which one end articulates with a first articulation hole of the handle, and the other end articulates with the second articulation hole of the second connecting rod, and inserted into the sliding groove of the jump buckle. Further, the lock buckle is driven by external force to turn toward a tripping direction to release the locking fit with the jump buckle, so that the operating mechanism is tripped; the circuit breaker further comprises a tripping mechanism, which comprises a drawbar slidingly arranged, the drawbar comprises a drawbar-driving portion drivingly cooperating with the lock buckle, when the drawbar is driven by force to slide, the drawbar drives the lock buckle to turn toward the tripping direction by means of the drawbar-driving portion; a first empty travel is provided between the lock buckle and the drawbar-driving portion, when the lock buckle is driven by force outside the drawbar to turn toward the tripping direction, the lock buckle first covers the first empty travel relative to the drawbar-driving portion. Further, the lock buckle is in contact with the drawbar-driving portion after covering the first empty travel relative to it. Further, the drawbar-driving portion is provided with a drawbar-adapted rounded long hole, the tripping mechanism further comprises an articulation shaft, which is connected to the lock buckle and inserted in the drawbar-adapted rounded long hole, when the lock buckle covers the first empty travel relative to the drawbar-driving portion, the articulation shaft moves within the drawbar-adapted rounded long hole. Further, the drawbar further comprises a drawbar-connecting portion and a drawbar-driven portion, the drawbar-driving portion, the drawbar-connecting portion and the drawbar-driven portion are connected with each other in proper order, the drawbar-connecting portion is provided with a drawbar-adapted sliding hole, which is a rounded long hole and sleeves a drawbar sliding shaft set on the housing; the circuit breaker further comprises a bimetallic strip and/or a magnetic flux trip, the bimetallic strip and/or the magnetic flux trip drivingly cooperate with the drawbar-driven portion to drive the drawbar to slide. The circuit breaker according the present invention has compact structure and occupation with concentrated space in small proportion, and the operating mechanism makes full use of the internal limited space, and enables more functional modules to be integrated in the limited space of products, so as to realize more functions of products. In addition, the first empty travel eliminates or reduces the movement distance of the drawbar when it does not operate (that is, the movement distance under the driving of the lock buckle), thereby reducing the installation and operation space required by the drawbar, conducing to improvement to the compactness of the tripping mechanism.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a 3D view of the circuit breaker according to the present invention when it is in a switch-off state; Fig. 2 is a front view of the circuit breaker according to the present invention when it is in a switch-off state;

Fig. 3 is a local structural sectional view showing the separation between the jump buckle and the lock buckle when the contact of the circuit breaker in the present invention is in a switch-off position; Fig. 4 is a 3D view of the circuit breaker according to the present invention when it is in a switch-on state; Fig. 5 is a front view of the circuit breaker according to the present invention when it is in a switch-on state; Fig. 6 is a local structural sectional view showing the separation between the jump buckle and the lock buckle when the contact of the circuit breaker in the present invention is in a switch-on position; Fig. 7 is a local structural sectional view showing that the circuit breaker of the present invention is in a first tripping process state; Fig. 8 is a local structural sectional view showing that the circuit breaker of the present invention is in a second tripping process state; Fig. 9 is a local structural sectional view showing that the circuit breaker of the present invention is in a third tripping process state; Fig. 10 is a 3D view showing that the circuit breaker of the present invention is in a third tripping process state; Fig. 11 is a structural schematic diagram of the base of the housing according to the present invention; Fig. 12 is a structural schematic diagram of the handle according to the present invention; Fig. 13 is a 3D view of the jump buckle according to the present invention; Fig. 14 is a front view of the jump buckle according to the present invention; Fig. 15 is a front 3D view of the lock buckle according to the present invention; Fig. 16 is a back 3D view of the lock buckle according to the present invention; Fig. 17 is a 3D view of the connecting rod according to the present invention; Fig. 18 is a 3D view of the lever according to the present invention; Fig. 19 is a structural schematic diagram of the moving contact according to the present invention; Fig. 20 is a projection view showing that the circuit breaker of the present invention is in a switch-on state;

Fig. 21 is a diagram showing the cooperation relation of the lock buckle, the drawbar and the bimetallic strip according to the present invention; Fig. 22 is a 3D view of the drawbar according to the present invention.

DETAILED DESCRIPTIONOFTHE PREFERRED EMBODIMENTS We shall further describe the specific embodiments of the circuit breaker of the present invention in combination with the examples given in Figs. 1-22 as follows. The circuit breaker according to the present invention are not limited to the description of the following examples. As shown in Figs. 1-10 and 20, the circuit breaker according to the present invention comprises the housing 1, the operating mechanism, the moving contact 8, the stationary contact 9 and the trip 101. The operating mechanism comprises the handle 2, the first connecting rod 3, the jump buckle 4, the lock buckle 5, the second connecting rod 7 and the lever 6, the jump buckle 4 and the lock buckle 5 are respectively pivotally installed on the base plate of the housing 1, the lock buckle 5 is provided with the trip-driving portion 56 corresponding to the trip 101, the jump buckle 4 is provided with the sliding groove 42 and a jump buckle-catching portion for catching the buckle boss 53 of the lock buckle 5, and the jump buckle-catching portion in this embodiment is a catching edge 43 for catching the buckle boss 53 of the lock buckle 5. The handle 2 is pivotally installed on the base plate of the housing 1, of the first connecting rod 3 one end is connected with the handle 2, the other end articulates with one end of the second connecting rod 7, the other end of the second connecting rod 7 is connected with the lever 6, and the articulated end of the first connecting rod 3 and the second connecting rod 7 is inserted into the sliding groove 42 of the jump buckle 4, slides along the sliding groove 42 and cooperates with it; the lever 6 is pivotally installed on the housing 1, of the moving contact one end is installed on the lever 6, and the other end is arranged opposite the stationary contact 9. The circuit breaker according to the present invention comprises the jump buckle 4 having the sliding groove 42 and a cam-and-five-bar linkage mechanism composed of the housing 1, the handle 2, the first connecting rod 3, the second connecting rod 7 and the lever 6. Among them the cam-and-five-bar linkage mechanism composed of the housing 1, the handle 2, the first connecting rod 3, the second connecting rod 7 and the lever 6 has two degree of freedom, and then the articulated end of one end of the first connecting rod 3 and the second connecting rod 7 is restricted within the fixed sliding groove 42, so as to cause the movement on the cam, thereby confining one degree of freedom, so that the cam-and-five-bar linkage mechanism with one degree of freedom is formed. The tripping mechanism composed of the jump buckle and the lock buckle and the transmission mechanism are basically separate from and independent of each other, so that the tripping mechanism is basically in a static state when the operating mechanism is in normal switch-on and switch-off operation, greatly improving the operational reliability of the entire mechanism. Preferably, the handle 2 in this embodiment is rotationally installed by means of the first rotational shaft 12, the lock buckle 5 is rotationally installed by means of the third rotational shaft 14, of the jump buckle 4 one end is rotationally installed by means of the second rotational shaft 11, the catching edge 43 of the other end buckles with the lock buckle 5, the first rotational shaft 12, the third rotational shaft 14 and the second rotational shaft 11 are positioned at three vertices of an obtuse triangle, among them the first rotational shaft 12 is positioned at the obtuse vertex of the obtuse triangle. The lever 6 is rotationally installed by means of the third rotational shaft 14, the articulated end of the lever 6 and the second connecting rod 7 acts as a movable vertex, and the first rotational shaft 12, the rotational shaft 11 and the third rotational shaft 14 act as fixed vertices, so as to form an movable quadrilateral, among them the first rotational shaft 12 and the third rotational shaft 14 are positioned at two obtuse vertices of the movable quadrilateral connected by one common edge, the articulated ends of the lever 6 and the second connecting rod 7 and the second rotational shaft 11 are positioned at two acute vertices of the movable quadrilateral connected by one common edge. It should be noted that the obtuse features, acute features, triangles, and the order of the vertices of the triangle in this embodiment are only an example, which cannot represent all other examples, nor limit the maximum protection scope of the present application. The obtuse triangle and the movable quadrilateral are not actually connected, only an assumed shape for providing convenience to describe the relative position among the operating part 2, the first meshing part 4, the second meshing part 5, the lever 6 and the second connecting rod 7. Specifically, as shown in Figs. 1-10, one end of the jump buckle 4 is rotationally installed below one side of the handle 2, and positioned between the handle 2 and the trip 101, the lock buckle 5 and lever 6 are rotationally installed on the other side of the handle 2, the other end of the jump buckle 4 basically horizontally extends from the bottom of the handle 2 to the other side of the handle 2 and buckles with the lock buckle 5, and the second connecting rod 7 is basically horizontally disposed below the handle 2, and positioned between the handle 2 and the trip 101, of the second connecting rod 7 one end articulates with the first connecting rod 3 and slides along the sliding groove 42, and the other end is connected with the lever 6, arranging the jump buckle 4 and the lock buckle 5 respectively on both sides of the handle 2 not only makes full use of the space between the handle 2 and the trip 101, but also effectively enlarges the arm of tripping force L2. The circuit breaker according the present invention has compact structure and occupation with concentrated space in small proportion, and the operating mechanism makes full use of the internal limited space, and enables more functional modules to be integrated in the limited space of products, so as to realize more functions of products. Preferably, when the circuit breaker is in a switch-on state, the pressure borne by the sliding groove of the jump buckle under the action of the articulated end of the first connecting rod and the second connecting rod is F1, and its arm of force is L1, while the positive pressure borne by the jump buckle-catching portion of the jump buckle under the action of the buckle boss of the lock buckle is F2, and its arm of force is L2, wherein the length ratio of the arm of force Li to the arm of force L2 is less than 1/4. Preferably, the length ratio of the arm of force Li to the arm of force L2 is less than 1/6. The trip 101 in this embodiment is an electromagnetic trip, which can trigger the lock buckle 5 and release the locking fit between the lock buckle 5 and the jump buckle when the circuit breaker is short-circuited, so as to make the circuit breaker trip andswitch-off, achieving circuit protection. The trip101 is connected with the stationary contact 9, an arc extinguishing chamber may be arranged below the trip 101, connecting terminals are further disposed on both sides of the circuit breaker, and the stationary contact 9 is positioned above the inlet side of the arc extinguishing chamber. Of course, the trip 101 may also be a leak electricity trip or an overload trip, as needed an electromagnetic trip, a leak electricity trip or an overload trip may also arranged inside the circuit breaker, which is used to drive the lock buckle 5 when the circuit breaker fails, the structure described here belongs to the prior art, will not be repeated.

As shown in Fig. 11, the housing 1 according to the present invention comprises an upper cover (not shown in the figures) and a base, which buckle with each other, the first rotational shaft 12 used to pivotally install the handle 2, the second rotational shaft 11 used to pivotally install the jump buckle 4, the third rotational shaft 14 used to pivotally install the lever 6 and lock buckle 5, the first blocking boss 13 and the position-restricting post 15 are arranged on the base plate of the housing. In this embodiment, the lock buckle 5 and the lever 6 are coaxially rotationally installed on the third rotational shaft 14, and arranged tier upon tier to save space; of course, the rotating axes of the lock buckle 5 and the lever 6 may also be different from each other. As shown in Fig. 12, the handle 2 according to the present invention comprises a handheld portion 21 and a rotating portion 22, which are connected as one, of the handle 2 the handheld portion 21 of one end extends out of the housing 1 to be pulled, and the rotating portion 22 of the other end is provided with the first shaft hole 23 used to be pivotally installed on the housing 1, and the first articulation hole 24 used to articulate with the first connecting rod 3. The handle 2 rotationally sleeves the first shaft 12 of the housing 1 through its first shaft hole 23 on its rotating portion 22. A fourth torsion spring used to reset the handle 2 is disposed at the pivot connection between the handle 2 and the housing 1, of the fourth torsion spring one end abuts against the housing 1, and the other end abuts against the handle 2. The two ends of the rotation travel of the handle 2 cooperate with the operation-stopping part on the housing, which restricts the two ends of the travel of the handle 2. As shown in Fig. 2, the circuit breaker is in a switch-off state, and the handheld portion 21 of the handle 2 is blocked by the operation-stopping part of the housing 1 at the left end; as shown in Fig. 5, the circuit breaker is in a switch-on state, and the handheld portion 21 of the handle 2 is blocked by the operation-stopping part of the housing 1 at the right end. The first connecting rod 3 in this embodiment is a U-shaped rod, of which one end articulates with the first articulation hole 24 of the handle 2, and the other end articulates with the second articulation hole 71 of the second connecting rod 7, and inserted into the sliding groove 42 of the jump buckle 4. One end of the U-shaped rod connected with the second connecting rod 7 is directly used as the articulation shaft inserted into the sliding groove 42, such structure is simple and easy to assemble.

As shown in Figs. 13-14, the jump buckle 4 according to the present invention is an integrally-molded piece, comprising the jump buckle-turning portion 401, the sliding groove segment 402 and the jump buckle-catching arm 403, which are connected in proper order, the jump buckle-turning portion 401 is cylindrical, the sliding groove segment 402 is a square -shaped block, the jump buckle-catching arm 403 is a L-shaped block, the sliding groove segment 402 and the jump buckle-catching arm 403 are bent and connected with each other, the jump buckle-catching arm is slightly inclined toward the under side far away from the handle 2 , wherein the sliding groove segment 402 and the jump buckle-catching arm 403 can fit with the sticking gap 75 of the second connecting rod 7, the sliding groove segment 402 is disposed flush with the top and bottom surfaces of the jump buckle-catching arm 403, the jump buckle-turning portion 401 protrudes from the top surface of the sliding groove segment 402, and a notch used to avoid the second connecting rod 7 is disposed on the jump buckle-turning portion 401; the jump buckle-turning portion 401 is provided with the second shaft hole 41, and the jump buckle 4 rotationally sleeves the second rotational shaft 11 of the housing 1 through its second shaft hole 41; the sliding groove segment 402 is provided with the sliding groove 42, preferably, the sliding groove 42 is an elongated rounded long hole, the sliding groove 42 is a linear groove slightly inclined from the rotating axis of the jump buckle 4 to the upper side of the handle 2. Preferably, a raised buckle hook is disposed on the outside turn of the L-shaped block-like jump buckle-catching arm 403, the raised sliding arc surface 44 slidingly fitting with the lock buckle 5 is arranged on the end face of the jump buckle-catching arm 403, the junction of the sliding arc surface 44 and the buckle hook is the catching edge 43 that can catch the buckle boss 53 of the lock buckle 5. As shown in Fig. 14, the line connecting the center 0 of the sliding arc surface 44 where the catching edge 43 is located with the rotating axis of the jump buckle 4 intersects with the sliding arc surface 44 to form a point, which is the position where the catching edge 43 is located on the sliding arc surface 44 farthest from the rotating axis of the jump buckle 4, and is located above the buckle hook, forming a cam. That is, the line connecting the rotating axis of the jump buckle 4 to the sliding arc surface 44 via the center 0 of the sliding arc surface 44 where the catching edge 43 is located is L3, the line connecting the rotating axis of the jump buckle 4 to the catching edge 43 is L4, an angle a is formed between L3 and L4, a is an acute angle and quite small, under the conditions of the invariant length of L3 and L4, the smaller the angle a, the faster the lock buckle 5 turns, and the length of L3 is greater than the length of L4. As shown in Fig. 7, when the jump buckle 4 disengages from the lock buckle 5, the operating mechanism is converted into a five-bar linkage mechanism composed of the housing 1, the handle 2, the first connecting rod 3, the second connecting rod 7 and the lever 6 (excluding the jump buckle 4), which has two degree of freedom; the lever 6 turns counterclockwise under the action of the first torsion spring 102, and then drives the second connecting rod 7 and the first connecting rod 3 to move, and the jump buckle 4 is pulled by the second connecting rod 7 to turn rapidly around the second rotational shaft 11. As shown in Fig. 8, the sliding arc surface 44 of the jump buckle 4 slides tangentially along the guiding protrusion 54 (Fig. 16) for which the lock buckle 5 acts as a sliding surface, so as to push the lock buckle 5 to turn, the turn angle of the lock 5 is determined by the difference between L3and L4 of the jump buckle 4, and in direct proportion to the difference between L3 and L4. As shown in Figs. 9-10, when the line connecting the first shaft hole 23 of the handle 2 to the first articulation hole 24 turns into a straight line with the straight line where the main body of the first connecting rod 3 is located, the jump buckle 4 turns over a maximum angle, at this time the sharp point feature 45 of the jump buckle 4 cannot exceed the surface where the guiding protrusion 54 of the lock buckle is located, so as to enable the lock buckle 5 not to catch the jump buckle 4, so that the jump buckle 4 cannot reset. When the lever 6 moves to a switch-off state, that is, the position-restricting bevel 64 of the lever 6 abuts against the position-restricting post 15 of the housing 1, at this time the lever 6 is supported by the position-restricting post 15 and in a stationary state, the handle 2, the first connecting rod 3, the second connecting rod 7 and the shousing 1 constitute a four-bar linkage mechanism, the handle 2 turns counterclockwise under the action of the fourth torsion spring, and then drives the first connecting rod 3 and the second connecting rod 7 to move, the first connecting rod 3 drives the jump buckle 4 to turn counterclockwise through the sliding groove 42 of the jump buckle 4; when the handle 2 turns to the switch-off position, the sliding arc surface 44 of the jump buckle 4 returns back along the guiding protrusion 54 of the lock buckle 5, at this time the catching edge 43 of the jump buckle 4 is positioned on the upper side of the buckle boss 53 of the lock buckle 5, ready for the re-buckle of the tripping mechanism. As shown in Figs. 15-16, one end of the lock buckle 5 according to the present invention is provided with the fourth shaft hole 51, the lock buckle 5 rotationally sleeves the third rotational shaft 14 of the housing 1 through its fourth shaft hole 51, the bottom surface of the other end of the lock lock buckle 5 is provided with the trip-driving portion 56 protruding downwards, which is arranged opposite the withstanding pin of the trip 101 of the circuit breaker, and positioned on the side of the trip 101; the lock buckle protrusion 50 protruding downwards is arranged at the bottom surface of the middle of the lock buckle 5 close to the fourth shaft hole 51, and a dodging groove dodging the second connecting rod 7 is formed between the lock buckle protrusion 50 and the trip-driving portion 56, the interacting shaft 52 protruding downwards and the guiding protrusion 54 protruding sidewards are arranged on the lock buckle protrusion 50, acting as a sliding surface cooperating with the jump buckle 4, the buckle boss 53 is disposed on the side of the lock buckle protrusion 50, and buckles with the catching edge 43 of the jump buckle 4, the guiding protrusion 54 is arranged at intervals with the bottom surface of the lock buckle 5, so as not to dodge the second connecting rod 7, the guiding protrusion 54 can extend into the sticking gap 75 of the second connecting rod 7, the interacting groove is arranged at the position of the top surface of the lock buckle 5 corresponding to the interacting shaft 52. One side of the lock buckle 5 is provided with the interacting shaft 52, which can be inserted into the interacting groove 55 of the adjacent circuit breaker, and the other side of the lock buckle 5 is provided with the interacting groove 55, into which the interacting shaft 52 of another adjacent circuit breaker may be inserted, and the lock buckle 5 may interact with the operating mechanism adjacent to the two circuit breakers by means of the interacting shaft 52 and the interacting groove 55 on it; when the tripping mechanism is tripped, the lock buckle 5 is pushed by the jump buckle 4 to turn at a certain angle, the operating mechanism of the adjacent circuit breaker is driven to disengage by the interacting shaft 52 or the interacting groove 55, so as to realize the interaction between the poles of the circuit breaker. Of course, the lock buckle 5 may also be provided only with the interacting shaft 52 or the interacting groove 55 used to be plugged into the operating mechanism of the adjacent circuit breaker.

As shown in Fig. 17, the second connecting rod 7 according to the present invention comprises two connecting rod pieces 73 and two connecting ribs 74 connected between the two connecting rod pieces 73, the two connecting ribs 74 are spaced and positioned on the same side of the two connecting rod pieces 73, a sticking gap 75 for dodging the jump buckle 4 and/or the lock buckle 5 and/or the lever 6 is set between the two connecting rod pieces 73, of the two connecting rod pieces 73 their one ends are aligned with each other, and provided with a second articulation hole 71 for articulating with the first connecting rod 3, and their other ends are aligned with each other, and provided with the third articulation hole 72 for articulating with the lever 6. When the sliding groove segment 402 of the jump buckle 4 is inserted into the sticking gap 75 of the second connecting rod 7, the second articulation hole 71 of the second connecting rod 7 is directly opposite the sliding groove 42 of the jump buckle 4, one end of the first connecting rod 3 may simultaneously pass through the sliding groove 42 of the jump buckle 4 and the two second articulation holes 71 at one end of the second connecting rod 7. The second connecting rod 7 uses two connecting rod pieces 73 to form a sticking gap 75, which is used to dodge and connect the jump buckle 4 and the lever 6, therefore, such structure is not only reliable in connection, but also takes up little space. As shown in Fig. 18, the lever 6 according to the present invention comprises the lever plate 60, the connecting rib 600 disposed on the lever plate 600, the supporting boss 68, the stopping protrusion 66 and the third blocking boss 65, the connecting rib 600 is disposed along the edge of the lever plate 60, and positioned between the stopping protrusion 66 and the third blocking boss 65, the fourth rotational shaft 67 used to pivotally install the moving contact 8 is disposed on the supporting boss 68, the supporting boss 68 is connected with the stopping protrusion 66 and the connecting rib 600, and below the stopping protrusion 66 and the connecting rib 600, thereby forming a dodging space for dodging the moving contact 8, one end of the moving contact 8 rotationally sleeves the fourth rotational shaft 67 of the lever 6 through its fifth shaft hole 82, and falls on the supporting boss 68; the third blocking boss 65 is disposed at one corner of the lever plate 60, which extends outwards to form the extending portion 601, of the position connecting the extending portion 601 with the lever plate 60 one side is provided with the position-restricting bevel 64 cooperating with the position-restricting post 15 of the housing 1, and the other side is provided with the circular sticking portion 602 cooperating with the sticking gap 75 of the second connecting rod 7, the fourth articulation hole 63 used to connect with the second connecting rod 7 is disposed on the sticking portion 602; the second blocking boss 62 used to abut against one end of the first torsion spring 102 is disposed on the middle bottom surface of the extending portion 601, and the end of the extending portion 601 is provided with the third shaft hole 61 used to pivotally install the lever 6, and cooperating with the third rotational shaft 14 of the housing 1. The position-restricting bevel 64 of the lever 6 is in contact with the position-restricting post 15 of the housing 1, and the moving contact 8 and the stationary contact 9 are in separate positions to position and restrict the positional terminal point of the lever 6 when the circuit breaker is in a switch-off or a tripped state. Of the first connecting rod 3 one end articulates with the first articulation hole 24 of the handle 2, and the other end articulates with the second articulation hole 71 of the second connecting rod 7, and is inserted into the sliding groove 42 of the jump buckle 4; the sticking portion 602 of the lever 6 sticks into the sticking gap 75 of the second connecting rod 7, and the third articulation hole 72 of the second connecting rod 7 is aligned with the fourth articulation hole 63 of the lever 6, and inserted with a pin to enable the second connecting rod 7 to articulate with the lever 6. As shown in Figs. 1-10, of the lock buckle 5 one end is pivotally installed on housing 1 and positioned on the side of the handle 2, the other end is positioned on the side of the trip 101, of the lever 6 one end is pivotally installed on the housing 1 and positioned on the side of the handle 2, and the other end is positioned on the side of the trip 101. Preferably, the lock buckle 5 is stacked on the lever 6 and is disposed on the same rotational shaft with the lever 6, which rotationally sleeves the third rotational shaft 14 of the housing 1 through the third shaft hole 61 on it, the lever elastic part used to reset the lever 6 is arranged between the lever 6 and the housing 1, the lock buckle 5 rotationally sleeves the third rotational shaft 14 of the housing 1 through the fourth shaft hole 51 on it, and the lock buckle-elastic part used to reset the lock buckle 5 is arranged between the lock buckle 5 and the housing 1. Specifically, the lever elastic part is the first torsion spring 102, the first torsion spring 102 used to reset the lever 6 is disposed at the pivot connection between the lever 6 and the housing 1, of the first torsion spring 102 one end abuts against the first blocking boss 13 of the housing 1, and the other end abuts against the second blocking boss 62 of the lever 6; the lock buckle-elastic part is the second torsion spring 103, the second torsion spring 103 used to reset the lock buckle 5 at the pivot connection between the lock buckle 5 and the housing 1, of the second torsion spring 103 one end abuts against the housing 1, and the other end abuts against the lock buckle 5. The tripping mechanism composed of the jump buckle 4 and the lock buckle 5 is in a static state when the operating mechanism is in normal switch-on and switch-off operation, when the circuit fails and the current triggers the trip 101 to act, the trip 101 drives the lock buckle 5 to turn counterclockwise, the catching edge 43 separates from the buckle boss 53, the lock buckle 5 turns around the third rotational shaft 14, and the cam-and-five-bar linkage mechanism is transformed into a six-bar linkage mechanism, which has two degree of freedom, the first torsion spring 102 drives the lever 6 to return to the switch-off position. As shown in Figs. 1-10, the moving contact 8 according to the present invention is pivotally installed on the lever 6, and an overtravel elastic part is arranged between the moving contact 8 and the lever 6, and the moving contact 8 rotationally sleeves the fourth rotational shaft 67 of the lever 6 through the fifth shaft hole 82 on it; the overtravel elastic part is the third torsion spring 104, the third torsion spring 104 is arranged at the pivotal connection between the moving contact 8 and the lever 6, of the third torsion spring 104 one end abuts against the third blocking boss 65 of the lever 6, and the other end abuts against the blocking lateral edge 83 on one side of the moving contact 8. As shown in Fig. 19, the other side of the moving contact 8 is provided with the stopping protrusion 81, and the stopping boss 66 corresponding to the stopping protrusion 81 is disposed on the lever 6. Further, as shown in Fig. 19, the side of the moving contact 8 is provided with the raised contact arc surface 84, which may contact with the stationary contact 9. The stopping protrusion 81 of the moving contact 81 is in contact with the stopping boss 66, when the moving contact 8 and the stationary contact 9 are in a switch-off state, the third torsion spring 104 applies an initial pressure to the moving contact 8 and the lever 6, so that the moving contact 8 and the lever 6 form an integral movement; after the moving contact 8 has been in contact with the stationary contact 9, the moving contact 8 turns at a certain angle around the fourth rotational shaft 67 relative to the lever 6, the stopping protrusion 81 separates from the stopping boss 66, and the third torsion spring 104 applies a final pressure to the moving contact to ensure reliable contact between the moving contact 8 and the stationary contact 9. There is a pressure torsion spring between the moving contact 8 and the lever 6 to ensure reliable contact between the moving contact 8 and the stationary contact 9; The lever 6, the moving contact 8 and the stationary contact 9 constitute a rocker-slider mechanism, the friction of the contact arc surface 84 sliding along the surface of the stationary contact 9 can effectively remove the oxide films on the surfaces of the moving contact 8 and the stationary contact 9, improving the conductivity between the moving contact 8 and the stationary contact 9. As shown in Figs. 2-3, when the circuit breaker is in a switch-off state, the handheld portion 21 of the handle 2 swings to the left side to contact the housing 1, and one end of the first connecting rod 3 connected to the handle 2 is positioned on the right side of the rotating axis of the handle, one end of the first connecting rod 3 connected to the second connecting rod 7 slides to the end of the sliding groove 42 away from the rotating axis of the jump buckle 4, the catching edge 43 of the jump buckle 4 buckles with the buckle boss 53 of the lock buckle 5, the position-restricting bevel 64 of the lever 6 (Fig. 18) is in contact with the position-restricting post 15 of the housing 1, and the moving contact 8 and the stationary contact 9 are in separate positions. As shown in Figs. 5-6, when the circuit breaker is in a switch-on state, the handheld portion 21 of the handle 2 swings to the right side to contact the housing 1, and one end of the first connecting rod 3 connected to the handle 2 is positioned on the left side of the rotating axis of the handle 2, one end of the first connecting rod 3 connected to the second connecting rod 7 slides towards the left to the end of the sliding groove 42 away from the rotating axis of the jump buckle 4, enabling the second connecting rod 7 to pull the lever 6, which drives the moving contact 8 to swing to the left and make contact with the stationary contact 9, the first connecting rod 3 and the handle 2 form a certain dwell angle, and the moving contact 8 and the stationary contact 9 are in a switch-on state. When the circuit breaker fails, such as a short circuit, the withstanding pin of the trip 101 hits the trip-driving portion 56 of the lock buckle 5, so that the lock buckle 5 turns counterclockwise, releasing the locking fit of the jump buckle 4 and the lock buckle 5, the lever 6 drives the moving contact to swing to the right and separate from the stationary contact, the jump buckle 4 turns clockwise, and the articulation shaft of the first connecting rod 3 and the second connecting rod 7 slides to the right along the sliding groove 42. As shown in Figs. 20-21, of the circuit breaker according to the present invention the lock buckle 5 is driven by external force to turn toward the tripping direction to release the locking fit with the jump buckle 4, so that the operating mechanism is tripped; the circuit breaker according to the present invention further comprises a tripping mechanism, the tripping mechanism comprises the drawbar 7a slidingly arranged, the drawbar 7a comprises the drawbar-driving portion 71a drivingly cooperating with the lock buckle 5, when the drawbar 7a is driven by force to slide, the drawbar 7a drives the lock buckle 5 to turn toward the tripping direction by means of the drawbar-driving portion 71a; a first empty travel is provided between the lock buckle 5 and the drawbar-driving portion 71a, when the lock buckle 5 is driven by force outside the drawbar 7a to turn toward the tripping direction, the lock buckle 5 first covers the first empty travel relative to the drawbar-driving portion 71a. The first empty travel eliminates or reduces the moving distance of the drawbar 7a when it does not operate (that is, the movement distance under the driving of the lock buckle 5), thereby reducing the installation and operation space required by the drawbar 7a, conducing to improvement to the compactness of the tripping mechanism. Referring to Figs. 20-21, the lock buckle 5 is in contact with the drawbar-driving portion 71a after covering the first empty travel relative to it, that is, when the lock buckle 5 is driven by force outside the drawbar 7a to turn toward the tripping direction, the lock buckle 5 first covers the first empty travel relative to the drawbar-driving portion 71a, then contacts with the drawbar 7a under position restriction and drives it to slide. Further, when the drawbar 7a is driven by force and slides, the drawbar 7a synchronously drives the lock buckle 5 to turn toward the tripping direction 5 by means of the drawbar-driving portion 71a. As shown in Figs. 20-21, the first empty travel is actualized in the following way: the drawbar-driving portion 71a is provided with the drawbar-adapted rounded long hole 710a, the tripping mechanism further comprises the articulation shaft 5-7a, which is connected to the lock buckle 5 and inserted in the drawbar-adapted rounded long hole 710a. When the lock buckle 5 covers the first empty travel relative to the drawbar-driving portion 71a, the articulation shaft 5-7a moves within the drawbar-adapted rounded long hole 710a. Further, the drawbar-adapted rounded long hole 710a is slantingly arranged, that is, it inclines in the direction of the bimetallic strip 8a from its upper end to its lower end. Specifically, as shown in the direction shown in Figs. 21-22, the left end of the drawbar-adapted rounded long hole 710a is in contact with the articulation shaft 5-7a, when the drawbar 7a is driven by force to slide, that is, the drawbar 7a just begins to slide, the drawbar-driving portion 71a and the articulation shaft 5-7a concurrently drive the lock buckle 5 to turn toward the tripping direction, so as to enable the lock buckle 5 and the jump buckle 4 to release the locking fit between them; when the lock buckle 5 is driven by force outside the drawbar 7a to turn toward the tripping direction, the lock buckle 5 first drives the articulation shaft 5-7 to move relative to the drawbar-adapted rounded long hole 710a until the articulation shaft 5-7a is in contact with the right end of the drawbar-adapted rounded long hole 710a, the lock buckle 5 continues to turn, and the lock buckle 5 can exactly drive the drawbar 7 to slide to the right, thereby reducing sliding under the action of the lock buckle 5 when the drawbar 7 is out of operation. In the tripping mechanism according to this embodiment, the articulation shaft 5-7a and the lock buckle 5 are integrated as one piece. In other embodiments, the articulation shaft 5-7a and the lock buckle 5 may also separate from each other as split pieces. The first empty travel may be actualized in the other ways: An open groove is set on the drawbar-driving portion 71a, that is, the bottom end of the open groove is in contact with the articulation shaft 5-7a, when the lock buckle 5 is driven by force outside the drawbar 7a to turn toward the tripping direction, it drives the articulation shaft 5-7a to move to the open end of the open groove, enabling the lock buckle 5 not to move the drawbar 7a during the entire movement process. Or, the drawbar-driving portion 71a is connected to the articulation shaft 5-7a, while a rounded long hole is set on the lock buckle 5, the articulation shaft 5-7a is in contact with one end of the rounded long hole close to the drawbar-driving portion 71a, so as to synchronously drive the lock buckle 5 to turn at the time of the drawbar 7a moving, when the lock buckle 5 is driven by force outside the drawbar 7a to turn toward the tripping direction, the rounded long of the lock buckle 5 moves relative to the articulation shaft 5-7a. There are many other embodiments, which will not be described here. In other embodiments, a small fitting gap is set between the drawbar-driving portion 71a and the lock buckle 5a, when the drawbar 7a is driven by force to slide, the drawbar-driving portion 71a covers the fitting gap relative to the lock buckle 5 then contacts with it, and then while the tie rod 7a slides, it drives the lock buckle 5 to turn toward the tripping direction. Specifically, as shown in Fig. 21, when the drawbar 7a is driven by force to slide, the drawbar-adapted rounded long hole 710a of the drawbar-driving portion 71a first covers the fitting gap relative to the articulation shaft 5-7a of the lock buckle 5, so that the left end of the drawbar-adapted rounded long hole 710a is in contact with the articulation shaft 5-7a, and then the drawbar 7a continues to slide and synchronously drives the lock buckle 5 to turn toward the tripping direction. The circuit breaker according to the present invention further comprises a short-circuit protection structure directly drivingly cooperating with the lock buckle 5, which is a transient trip, providing the lock buckle 5 with force outside the drawbar 7a to make it turn toward the tripping direction. Further, the transient trip is an electromagnetic trip. As shown in Figs. 20-21, the tripping mechanism further comprises the bimetallic strip 8a and/or a magnetic flux trip, the drawbar 7a further comprises the drawbar-driven portion 73a, the bimetallic strip 8a and/or the magnetic flux trip respectively cooperate with the drawbar-driven portion 73a to drive the drawbar 7a to slide. Specifically, as shown in Figs. 20-21, the tripping mechanism concurrently comprises the bimetallic strip 8a and the magnetic flux trip; the drawbar-driven portion 73a comprises two driven fingers arranged at intervals with each other, which are the first driven finger and the second driven finger, respectively, the second driven finger is close to the lock buckle 5 relative to the first driven finger, the bimetal driving end 81a of the bimetallic strip 8a is inserted between the two driven fingers, cooperates with the first driven finger and forms a fitting gap between its and the first driven finger, and the magnetic flux trip cooperates with the second driven finger. As shown in Figs. 20-22, the drawbar 7a further comprises the drawbar-connecting portion 70a, the drawbar-driving portion 71a, the drawbar-connecting portion 70a and the drawbar-driven portion 73a, which are connected with each other in proper order, the drawbar-driven portion 73a is provided with the drawbar-adapted rounded long hole 710a, the drawbar-connecting portion 70a is provided with the drawbar-adapted sliding hole 700a, which is a rounded long hole and sleeves the drawbar sliding shaft

10-7 set on the housing 1 to slidingly cooperate with it. Further, the drawbar-driving portion 71a is connected crookedly with one end of the drawbar-connecting portion 70a, the drawbar-driven portion 73a is connected crookedly with the other end of the drawbar-connecting portion 70a, the drawbar-driving portion 71a and the drawbar-driven portion 73a bend toward both sides of the drawbar-connecting portion 70a, respectively. Further, the drawbar-driven portion 73a is connected vertically with the drawbar-connecting portion 70a. We have made further detailed descriptions of the present invention mentioned above in combination with specific preferred embodiments, but it is not deemed that the specific embodiments of the present invention is only limited to these descriptions. A person skilled in the art can also, without departing from the concept of the present invention, make several simple deductions or substitutions, which all be deemed to fall within the protection scope of the present invention.

Claims (15)

1. A circuit breaker, comprising a housing (1), a handle (2), a first connecting rod (3), a jump buckle (4), a lock buckle (5), a second connecting rod (7), a lever (6), a moving contact (8) and a stationary contact (9), wherein the jump buckle (4) and the lock buckle (5) are respectively pivotally installed on the housing (1), the jump buckle (4) is provided with a sliding groove (42) and a jump buckle-catching portion for catching the buckle boss (53) of the lock buckle (5); the handle (2) is pivotally installed on the housing (1), of the first connecting rod (3) one end is connected with the handle (2), the other end articulates with one end of the second connecting rod (7), the other end of the second connecting rod (7) is connected with the lever (6), and the articulated end of the first connecting rod (3) and the second connecting rod (7) slidingly cooperates with the sliding groove (42) of the jump buckle (4); the lever (6) is pivotally installed on the housing (1), of the moving contact (8) one end is installed on the lever (6), and the other end is arranged opposite the stationary contact (9).

2. The circuit breaker according to claim 1, wherein the handle (2) is rotationally installed by means of a first rotational shaft (12), the lock buckle (5) is rotationally installed by means of a third rotational shaft (14), of the jump buckle (4) one end is rotationally installed by means of a second rotational shaft (11), a catching edge (43) of the other end meshes with the lock buckle (5), the first rotational shaft (12), the third rotational shaft (14) and the second rotational shaft (11) are positioned at three vertices of an obtuse triangle, among them the first rotational shaft (12) is positioned at the obtuse vertex of the obtuse triangle.

3. The circuit breaker according to claim 1, wherein of the jump buckle (4) one end is rotationally installed, the other end is provided with a jump buckle-catching portion that locking with the lock buckle (5), the sliding groove (42) is arranged between the rotating axis of the jump buckle (4) and the jump buckle-catching portion, of the lock buckle (5) one end is rotationally installed, and the other end is provided with a trip-driving portion (56) for triggering a trip, the lock buckle (5) is provided with a sliding surface slidingly cooperating with the jump buckle-catching portion of the jump buckle (4), the raised buckle boss (53) locking with the jump buckle-catching portion is arranged on the sliding surface.

4. The circuit breaker according to claim 1, wherein the lock buckle (5) is disposed on the same rotational shaft with the lever (6), the lever (6) is rotationally disposed on a third rotational shaft (14) of the housing (1) through a third shaft hole (61) on it, a lever elastic part used to reset the lever (6) is arranged between the lever (6) and the housing (1), the lock buckle (5) is rotationally disposed on the third rotational shaft (14) of the housing (1) through a fourth shaft hole (51) on it, and a lock buckle-elastic part used to reset the lock buckle (5) is arranged between the lock buckle (5) and the housing (1).

5. The circuit breaker according to claim 1, wherein when the circuit breaker is in a switch-on state, the pressure borne by the sliding groove (42) of the jump buckle (4) under the action of the articulated end of the first connecting rod (3) and the second connecting rod (7) is F1, and its arm of force is L1, while the positive pressure borne by the jump buckle-catching portion of the jump buckle (4) under the action of the buckle boss of the lock buckle (5) is F2, and its arm of force is L2, the length ratio of the arm of force Li to the arm of force L2 is less than 1/4.

6. The circuit breaker according to claim 3, wherein the jump buckle (4) comprises a jump buckle-turning portion (401), a sliding groove segment (402) and a jump buckle-catching arm (403), which are connected with each other in proper order, the jump buckle-turning portion (401) is provided with a second shaft hole (41), the sliding groove segment (402) is provided with the sliding groove (42), a raised buckle hook is disposed on the corner of the end of the jump buckle-catching arm (403), a raised sliding arc surface (44) slidingly fitting with the lock buckle (5) is arranged on the end face of the jump buckle-catching arm (403), the junction of the sliding arc surface (44) and the buckle hook is a catching edge (43) that can catch the buckle boss (53) of the lock buckle (5).

7. The circuit breaker according to claim 6, wherein the line connecting the rotating axis of the jump buckle (4) to the sliding arc surface (44) via the center o of the sliding arc surface (44) is L3, the line connecting the rotating axis of the jump buckle (4) to the catching edge (43) is L4, an angle a is formed between L3 and L4, a is an acute angle, the length of L3 is greater than the length of L4.

8. The circuit breaker according to claim 3, wherein of the lock buckle (5) one end is provided with a fourth shaft hole (51), the bottom surface of the other end is provided with the trip-driving portion (56) protruding downwards; a lock buckle protrusion (50) protruding downwards is arranged at the bottom surface of the middle of the lock buckle (5) close to the fourth shaft hole (51), a dodging groove dodging the second connecting rod (7) is formed between the lock buckle protrusion (50) and the trip-driving portion (56), a guiding protrusion (54) protruding sidewards is arranged the lock buckle protrusion (50), acting as a sliding surface cooperating with the jump buckle (4), the buckle boss (53) that locking with the jump buckle (4) is disposed on the side of the lock buckle protrusion (50), the guiding protrusion (54) is arranged at intervals with the bottom surface of the lock buckle (5).

9. The circuit breaker according to any one of claims 1-8, wherein the second connecting rod (7) comprises two connecting rod pieces (73) and two connecting ribs (74) connected between the two connecting rod pieces (73), a sticking gap (75) for dodging the jump buckle (4) and/or the lock buckle (5) is arranged between the two connecting rod pieces (73) , of the two connecting rod pieces (73) one end is aligned with each other, and provided with a second articulation hole (71) for articulating with the first connecting rod (3), and the other end is aligned with each other, and provided with a third articulation hole (72) for articulating with the lever (6); the first connecting rod (3) is a U-shaped rod, of which one end articulates with a first articulation hole (24) of the handle (2), and the other end articulates with the second articulation hole (71) of the second connecting rod (7), and inserted into the sliding groove (42) of the jump buckle (4).

10. The circuit breaker according to any one of claims 1-8, wherein an interacting shaft (52) protruding downwards is arranged on the bottom surface of the lock buckle (5), an interacting groove (55) is arranged at the position of the top surface of the lock buckle (5) corresponding to the interacting shaft (52); the moving contact (8) is pivotally installed on the lever (6), the moving contact (8) is rotationally connected on the lever (6), a third torsion spring (104) is arranged at the pivotal connection between the moving contact (8) and the lever (6), of the third torsion spring (104) one end abuts against the lever (6), and the other end abuts against the moving contact (8); the moving contact (8) is provided with a stopping protrusion (81), and a stopping boss (66) corresponding to the stopping protrusion (81) is disposed on the lever (6).

11. The circuit breaker according to any one of claims 1-8, wherein the lever (6) comprises a lever plate (60) and a supporting boss (68) disposed on the lever plate (60), a fourth rotational shaft (67) used to pivotally install the moving contact (8) is disposed on the supporting boss (68); one corner of the lever plate (60) extends outwards to form an extending portion (601), of the position connecting the extending portion (601) with the lever plate (60) one side is provided with a position-restricting bevel (64) cooperating with a position-restricting post (15) of the housing (1), and the other side is provided with a fourth articulation hole (63) used to articulate with the second connecting rod (7); the end of the extending portion (601) is provided with a third shaft hole (61) used to pivotally install the lever (6).

12. The circuit breaker according to any one of claims 1-8, wherein the lock buckle (5) is driven by external force to turn toward a tripping direction to release the locking fit with the jump buckle (4), so that the operating mechanism is tripped; the circuit breaker further comprises a tripping mechanism, which comprises a drawbar (7a) slidingly arranged, the drawbar (7a) comprises a drawbar-driving portion (71a) drivingly cooperating with the lock buckle (5), when the drawbar (7a) is driven by force to slide, the drawbar (7a) drives the lock buckle (5) to turn toward the tripping direction by means of the drawbar-driving portion (71a); a first empty travel is provided between the lock buckle (5) and the drawbar-driving portion (71a), when the lock buckle (5) is driven by force outside the drawbar (7a) to turn toward the tripping direction, the lock buckle (5) first covers the first empty travel relative to the drawbar-driving portion (71a).

13. The circuit breaker according to claim 12, wherein the lock buckle (5) is in contact with the drawbar-driving portion (71a) after covering the first empty travel relative to it.

14. The circuit breaker according to claim 12, wherein the drawbar-driving portion (71a) is provided with a drawbar-adapted rounded long hole (710a), the tripping mechanism further comprises an articulation shaft (5-7a), which is connected to the lock buckle (5) and inserted in the drawbar-adapted rounded long hole (710a), when the lock buckle (5) covers the first empty travel relative to the drawbar-driving portion (71a), the articulation shaft (5-7a) moves within the drawbar-adapted rounded long hole (710a).

15. The circuit breaker according to claim 12, wherein the drawbar (7a) further comprises a drawbar-connecting portion (70a) and a drawbar-driven portion (73a), the drawbar-driving portion (71a), the drawbar-connecting portion (70a) and the drawbar-driven portion (73a) are connected with each other in proper order, the drawbar-connecting portion (70a) is provided with a drawbar-adapted sliding hole (700a), which is a rounded long hole and sleeves a drawbar sliding shaft (10-7a) set on the housing (1); the circuit breaker further comprises a bimetallic strip (8a) and/or a magnetic flux trip, the bimetallic strip (8a) and/or the magnetic flux trip drivingly cooperate with the drawbar-driven portion (73a) to drive the drawbar (7a) to slide.