Operating mechanism of circuit breaker and circuit breaker

Abstract

The present invention relates to the field of low-voltage electrical appliances, and in particular to an operating mechanism of a circuit breaker, comprising a bracket, a rocker arm assembly, a jumper, a locker and a re-fastener respectively rotatably arranged on the bracket, a first crank, an energy storage spring, a slide rail fixedly arranged relative to the bracket, a slider, a first connecting rod, a second connecting rod, a second crank rotatably arranged around a sixth center, a third connecting rod and a third crank rotatably arranged around a seventh center, wherein the third crank is located on one side of the operating mechanism in the horizontal direction of the operating mechanism; the operating mechanism can switch between three working states without connecting a contact system, and can change the layout of the contact system, thereby providing a larger installation space for an arc extinguishing chamber.

Description

Technical Field

[0001] The invention relates to the field of low-voltage electrical appliances, and in particular to an operating mechanism of a circuit breaker and a circuit breaker comprising the operating mechanism. Background Art

[0002] With the continuous development of photovoltaic technology, the performance requirements of its power distribution system for molded case circuit breakers are gradually increasing, prompting molded case circuit breaker products to continue to develop in the direction of small size and high performance.

[0003] In order to meet the high voltage breaking requirements of DC1000V and DC1500V at both poles of molded case circuit breakers in photovoltaic distribution lines, the arc voltage of the arc extinguishing chamber is often increased to meet the above requirements; while the operating mechanism of the traditional 250A molded case circuit breaker is a four- or five-link conversion structure, and the rotating shafts of the operating mechanism and the moving contact mechanism are arranged along the vertical direction of the operating mechanism, so that the arc extinguishing chamber can only be located on one side of the moving contact mechanism in the horizontal direction. At the same time, due to the limitation of the product size, the size of the arc extinguishing chamber cannot be greatly increased, resulting in the arc voltage of the arc extinguishing chamber being difficult to significantly improve; secondly, in the operating mechanism of the existing molded case circuit breaker, the correlation between the various components is high. Under the premise of meeting other parameters, it is not convenient to increase the opening distance between the moving and static contacts by adjusting the matching size between the connecting rods, and it is also impossible to match a large-sized arc extinguishing chamber. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide an operating mechanism of a circuit breaker, which can switch between three working states without connecting a contact system and can change the layout of the contact system to provide a larger installation space for the arc extinguishing chamber; and also provide a circuit breaker including the operating mechanism, which has good arc extinguishing performance.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A circuit breaker operating mechanism, comprising a bracket, a rocker assembly, a jumper, a locker and a re-locker respectively rotatably arranged on the bracket, a first crank, an energy storage spring, a slide rail fixedly arranged relative to the bracket, a slider, a first connecting rod, a second connecting rod, and a second crank rotatably arranged around a sixth center; the locker is snap-fitted with the jumper and limitedly matched with the re-locker; one end of the first crank is rotatably arranged on the jumper around an eighth center, and the other end is connected to one end of the first connecting rod and one end of the energy storage spring rotatably around a tenth center, the other end of the energy storage spring is connected to the rocker assembly, the other end of the first connecting rod is rotatably connected to the slider, and the slider is slidably arranged on the slide rail One end of the second connecting rod is rotatably connected to the slider, and the other end is rotatably connected to the second crank around the eleventh center to drive it to rotate; when the operating mechanism is in the open or tripped state, the slide rail and the slider limit cooperate to prevent the slider from sliding; the operating mechanism also includes a third connecting rod and a third crank rotatably arranged around the seventh center, the second crank and one end of the third connecting rod are rotatably connected around the eleventh center, and the other end of the third connecting rod is rotatably connected to the third crank around the twelfth center to drive it to rotate; the rocker arm assembly and the second crank are respectively located at two ends of the operating mechanism in the vertical direction of the operating mechanism, and the third crank is located on one side of the operating mechanism in the horizontal direction of the operating mechanism.

[0007] Preferably, the sixth center, the seventh center, the eleventh center and the twelfth center are arranged in parallel and spaced apart and are located at the four vertices of a quadrilateral; the second crank is rotatably arranged on the bracket around the sixth center, and the third crank is rotatably arranged on the bracket around the seventh center.

[0008] Preferably, the bracket is provided with a second crank guide hole, the second crank is rotatably connected to the third connecting rod through the eleventh shaft, the eleventh shaft is inserted into the second crank guide hole, and the shape of the second crank guide hole matches the motion trajectory of the eleventh shaft;

[0009] And / or, the bracket is provided with a third crank guide hole, the third connecting rod is rotationally connected to the third crank through a twelfth axis, the twelfth axis is inserted into the third crank guide hole, and the shape of the third crank guide hole matches the motion trajectory of the twelfth axis.

[0010] Preferably, the second crank is a strip plate structure, one end of which is rotatably arranged around a sixth center, and the other end is rotatably connected to the third connecting rod and the second connecting rod around an eleventh center.

[0011] Preferably, the third crank is a triangular plate structure, a first vertex of which is rotatably arranged around a seventh center, a second vertex is rotatably connected to a third connecting rod around a twelfth center, and a third vertex is used to be rotatably connected to a moving contact mechanism of the circuit breaker.

[0012] Preferably, the third crank is an obtuse-angled triangular plate structure, the first vertex angle of which is an obtuse angle.

[0013] Preferably, the bracket includes two bracket side panels arranged relatively at an interval, each bracket side panel includes a first side panel part and a second side panel part connected to each other, the rocker assembly, the jump fastener, the locking fastener, the re-fastener and the second crank are respectively rotatably arranged on the first side panel part, V-shaped grooves and slide rails are respectively arranged at both ends of the first side panel part in the vertical direction, the second side panel part is connected to one end of the first side panel part in the horizontal direction, the rocker assembly is swingably arranged in the V-shaped groove, and the third crank is rotatably arranged on the second side panel part.

[0014] Preferably, the slide rail is a groove-shaped structure or a hole-shaped structure.

[0015] Preferably, the slide rail is arranged on a bracket.

[0016] Preferably, the operating mechanism further comprises a first traction rod and a transmission trip latch which are snap-fitted and rotatably arranged respectively. When a short circuit and / or overload fault occurs in the circuit where the circuit breaker is located, the first traction rod is driven to rotate, thereby releasing the snap-fit ​​with the transmission trip latch, and the transmission trip latch rotates to drive the operating mechanism to trip.

[0017] Preferably, the operating mechanism further comprises a thermal magnetic tripping mechanism, which drives the first traction rod to rotate and releases the snap fit with the transmission tripping buckle when a short circuit or overload fault occurs in the circuit breaker.

[0018] Preferably, when a short circuit fault occurs in the circuit where the circuit breaker is located, the first traction rod is driven by the moving contact of the circuit breaker to release the snap-fit ​​with the transmission tripping latch.

[0019] Preferably, the operating mechanism further comprises a slidably arranged test button, and an external force drives the test button to slide, and the test button drives the first traction rod to move to release the buckle fit with the transmission jump buckle.

[0020] Preferably, when the operating mechanism is locked again from the tripped and opening state, the rocker arm assembly of the operating mechanism drives the transmission trip lock to reset and resumes the locking engagement with the first traction rod.

[0021] A circuit breaker comprises an operating mechanism of the circuit breaker and at least one group of disconnecting units, wherein the disconnecting units comprise a contact system and an arc extinguishing chamber, wherein the contact system comprises a moving contact mechanism and a stationary contact used in conjunction with each other, wherein the moving contact mechanism comprises a contact support rotatably arranged around a seventh center and a moving contact arranged on the contact support, wherein the contact support is connected to a third crank drive, and a rocker arm assembly, a second crank and an arc extinguishing chamber are sequentially arranged along the vertical direction of the operating mechanism.

[0022] In the operating mechanism of the present invention, the slide rail provides a guiding function for the slider and also serves as a support point to provide support force for the first connecting rod and the slider, so that the operating mechanism has stable closing position, opening position and tripping position without being connected to the moving contact mechanism of the disconnecting unit, making the operating mechanism an independently operable component, which is conducive to the modular assembly and production of the operating mechanism, and makes the distribution of the operating mechanism in the circuit breaker have more design space; in addition, in actual production, the operating mechanism does not need to cooperate with the moving contact mechanism of the disconnecting unit, avoiding the loss of the contact system of the disconnecting unit during the test process, reducing the R&D and production costs; in addition, the operating mechanism, its third crank is used to be connected to the moving contact mechanism of the circuit breaker, so that the moving contact mechanism and the operating mechanism are arranged side by side in the horizontal direction of the operating mechanism, thereby providing more space for setting the arc extinguishing chamber on one side of the vertical direction of the operating mechanism, so as to arrange arc extinguishing chambers with larger specifications and better arc extinguishing performance, thereby improving the arc extinguishing performance and breaking performance of the circuit breaker.

[0023] In addition, the operating mechanism is buckled again, and at the same time drives the transmission trip buckle to reset to resume the buckle cooperation with the first traction rod, thereby ensuring the reliable reset of the transmission trip buckle and the first traction rod, so as to prepare for the next tripping and opening.

[0024] The circuit breaker of the present invention comprises the operating mechanism and has good arc extinguishing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of a circuit breaker in a closed state of the present invention, showing a fast trip device and a test button;

[0026] Figure 2 It is a schematic diagram of the structure of the breaking unit in the closed state of the present invention;

[0027] Figure 3 It is a structural schematic diagram of the breaking unit of the present invention, in which the moving contact, the passive contact and the static contact are driven apart by the electric repulsive force to drive the first transmission structure to rotate;

[0028] Figure 4a It is a schematic structural diagram of a circuit breaker in a closed state of the present invention, showing the coordination relationship between the operating mechanism and the moving contact mechanism of the breaking unit;

[0029] Figure 4b It is a structural schematic diagram of the operating mechanism of the present invention in the closed state;

[0030] Figure 5a It is a projection schematic diagram of the circuit breaker in the tripped and opened state of the present invention;

[0031] Figure 5b It is a schematic diagram of the three-dimensional structure of the circuit breaker in the tripped and opened state of the present invention;

[0032] Figure 5c It is a schematic diagram of the structure of the operating mechanism in the tripped and opened state of the present invention, showing the matching relationship between the first traction rod and the thermal magnetic release;

[0033] Figure 6 It is a structural schematic diagram of the circuit breaker in the re-clamping process of the present invention;

[0034] Figure 7 is a structural schematic diagram of the first transmission structure of the present invention;

[0035] Figure 8 It is a structural schematic diagram of the primary push rod of the present invention;

[0036] Fig. 9 It is a structural schematic diagram of the secondary push rod of the present invention;

[0037] Fig.10 is a schematic structural diagram of a first traction rod of the present invention;

[0038] Fig.11 It is a structural schematic diagram of the transmission jump buckle of the present invention;

[0039] Fig.12 It is a schematic structural diagram of the second traction rod of the present invention.

[0040] Description of Reference Numerals

[0041] The first center 1S; the second center 2S; the third center 3S; the fourth center 4S; the fifth center 5S; the sixth center 6S; the seventh center 7S; the eighth center 8S; the ninth center 9S; the tenth center 10S; the eleventh center 11S; the twelfth center 12S; the first connecting shaft 1a; the rocker drive part 2a; the buckle structure 3a; the second connecting shaft 1b; the third connecting shaft 1c; the bracket 1; the second crank guide hole 1-1; the third crank guide hole 1-2; the energy storage spring 4; the handle 2; the rocker 3; the reset structure 6; the jumper 7; the slider shaft 8; the re-fastener 9; the lock member 10; the matching torsion spring 11; the disconnecting unit housing 12; the first crank 14; the crank limiter 15; the first A connecting rod 16; a slider 18; a second connecting rod 19; a second crank 22; a third connecting rod 23; a test button elastic reset member 24; a third crank 25; a drive shaft 28; a transmission jumper 32; a transmission jumper pivot end 32-0; a transmission jumper driving surface 32-1; a transmission jumper buckle end 32-2; a buckle end hook 32-20; a transmission jumper driven portion 32-3; a first traction rod 34; a first traction rod body 34-0; a first traction rod shaft hole 34-00; a first traction rod driven portion 34-1; a first traction rod buckle arm 34-2; a buckle arm hook 34-20; a first traction rod connecting arm 34-3; a first traction rod spring arm 34-4; a first traction rod reset elastic Component 36; contact support 40; moving contact 41; static contact 42; first transmission structure 43; first transmission structure mounting portion 43-0; first transmission structure shaft hole 43-00; first transmission structure driven portion 43-1; first transmission structure driving arm 43-2; primary push rod arm 44-0; primary push rod shaft 44-1; primary push rod shaft connecting portion 44-10; secondary push rod arm 45-0; secondary push rod arm connecting hole 45-00; secondary push rod shaft 45-1; test button 46; contact spring 47; contact spring first end 47-0; contact spring body 47-1; contact spring second end 47-2; first mounting shaft 48-0; second mounting shaft 48-1; second Traction rod 49; second traction rod body 49-0; second traction rod connecting arm 49-1; second traction rod armature matching arm 49-2; second traction rod bimetal matching arm 49-3; armature transmission part 50; bimetallic element 51; first hinge shaft 52-1; second hinge shaft 52-2; thermal magnetic tripping armature 53; thermal magnetic tripping yoke 54; connecting rod 55; first hinge shaft 55-0; second hinge shaft 55-1; second traction rod shaft 56; first traction rod shaft 58; transmission tripping elastic part 60; transmission tripping shaft 61; torsion spring limit shaft 62; rocker arm rotating shaft 85; crank tripping hinge shaft 86; four-bar structure 97; eleventh shaft 2223; twelfth shaft 2325. DETAILED DESCRIPTION

[0042] The following is combined with Figure 1-12The following embodiments are provided to further illustrate the specific implementation of the circuit breaker of the present invention. The circuit breaker of the present invention is not limited to the description of the following embodiments.

[0043] The circuit breaker of the present invention is preferably a circuit breaker with an energy storage operating mechanism, such as a molded case circuit breaker.

[0044] like Figure 1-6 As shown, the circuit breaker of the present invention includes an operating mechanism and at least one group of disconnecting units, and the operating mechanism is connected to the disconnecting unit to drive it to close or open, so that the circuit breaker is closed or opened. Further, the disconnecting unit includes a contact system, and the contact system includes a movable contact mechanism and a static contact used in conjunction, and the movable contact mechanism includes a rotatably arranged contact support 40 and a movable contact 41 arranged on the contact support 40.

[0045] The circuit breaker of the present invention preferably comprises a plurality of breaking units, wherein the moving contact mechanisms of the breaking units are arranged side by side and coaxially rotatable and are all connected to the operating mechanism for synchronous closing or opening.

[0046] like Figure 1 , 4a -6 is an embodiment of the operating mechanism.

[0047] The operating mechanism has three working states, namely, an open state, a closed state and a tripped state (tripped open state). In the tripped state, the operating mechanism can be switched to the open state by re-tripping.

[0048] like Figure 1 , 4a-6, the operating mechanism includes a bracket 1, a rocker assembly, a jumper 7, a lock 10 and a re-fastener 9 rotatably arranged on the bracket 1, a first crank 14, an energy storage spring 4, a slide rail fixedly arranged relative to the bracket 1, a slider 18, a first connecting rod 16, and a second crank 22 rotatably arranged around a sixth center 6S; the lock 10 is snap-fitted with the jumper 7 and is limitedly matched with the re-fastener 9; one end of the first crank 14 is rotatably arranged on the jumper 7 around an eighth center 8S, and the other end is connected to one end of the first connecting rod 16 and one end of the energy storage spring 4 rotatably around a tenth center 10S, the other end of the energy storage spring 4 is connected to the rocker assembly, and the other end of the first connecting rod 16 is rotatably connected to the slider 18, and the slider 18 is slidably arranged on the slide rail; when the operating mechanism is in the open or tripped state, the slide rail and the slider 18 are limitedly matched to prevent the slider 18 from sliding. The slider 18 converts the position change of the opening and closing movement of the first connecting rod 16 into the displacement of the slider 18, which is convenient for actual measurement and adjustment of parameters such as the structural dimensions connected to the slider 18. At this time, the conversion of the mechanism connecting rod and the transmission of torque can be achieved through the first crank 14, the first connecting rod 16, and the slider 18. The operating mechanism can realize the opening, closing and tripping operations without connecting the rotating shaft (that is, the moving contact mechanism), which is convenient for the modular production of the operating mechanism. That is to say, in the operating mechanism, the slide rail provides a guiding function for the slider 18, and also serves as a support point to provide support force for the first connecting rod 16 and the slider 18, so that the operating mechanism has stable closing position, opening position and tripping position without being connected to the moving contact mechanism of the disconnecting unit, making the operating mechanism an independently operable component, which is conducive to the modular assembly and production of the operating mechanism and allows more design space for the distribution of the operating mechanism in the circuit breaker; in addition, in actual production, the operating mechanism does not need to cooperate with the moving contact mechanism of the disconnecting unit, thereby avoiding damage to the contact system of the disconnecting unit during testing and reducing R&D and production costs.

[0049] Furthermore, in this embodiment, the jump fastener 7 is rotatably arranged on the bracket 1 around the first center 1S, the locking fastener 10 is rotatably arranged on the bracket 1 around the second center 2S, the fastener 9 is rotatably arranged on the bracket 1 around the third center 3S, and the rocker arm assembly is rotatably arranged on the bracket 1 around the fourth center 4S.

[0050] like Figure 1 , 4a -5c, the jump fastener 7 is rotatably arranged on the bracket 1 through the jump fastener shaft, the lock fastener 10 is rotatably arranged on the bracket 1 through the lock fastener shaft, and the re-fastener 9 is rotatably arranged on the bracket 1 through the re-fastener shaft.

[0051] like Figure 1 , 4a-6, the slide rail is preferably a long straight hole arranged on the bracket 1, and the slider 18 reciprocates in the long straight hole along its extension direction. Furthermore, one end of the long straight hole is open, and the other end is closed and is the opening position of the slider 18. It should be pointed out that the slide rail can also be arranged not on the bracket 1, but on a supporting structure independent of the operating mechanism, such as a housing structure for accommodating the operating mechanism or a housing of the disconnecting unit (the housing of the disconnecting unit is called the disconnecting unit housing 12, as shown in FIG. Figure 2 shown).

[0052] like Figure 1 , 4a -6, the rocker arm assembly includes a synchronously acting handle 2, a rocker arm 3 and a reset structure 6 for driving the jumper 7 and the locker 10 to buckle again, and the rocker arm 3 is rotatably arranged on the bracket 1 around the fourth center 4S (as shown in FIG. Figure 5c As shown, the rocker arm 3 is preferably rotatably arranged on the bracket 1 through the rocker arm shaft 85, and the rocker arm 3 is respectively limitedly matched with the bracket 1 at both ends of its swing stroke. Further, the reset structure 6 is a reset shaft arranged on the rocker arm 3 (the two ends of the reset shaft are respectively fixedly connected to the two rocker arm support legs of the rocker arm 3), and the jumper 7 is a strip structure, one end of which is snap-fitted with the lock member 10, and the other end is rotatably arranged on the bracket 1; when the operating mechanism is in the tripped state, the rocker arm assembly swings in the opening direction to drive the jumper 7 to rotate through the reset structure 6 and snap-fit ​​with the lock member 10 again (that is, the two resume snap-fitting), and the lock member 10 resumes the limited position cooperation with the re-fastener 9.

[0053] like Figure 1 , 4a As shown in Figure 6, the bracket 1 is provided with a V-shaped groove, and the rocker arm 3 is respectively limitedly matched with the two side walls of the V-shaped groove at both ends of its swing stroke.

[0054] like Figure 1 , 4b 5a, the first crank 14 is a triangular structure, the first vertex of which is rotatably arranged on the jumper 7 around the eighth center 8S (the first vertex is preferably rotatably connected to the jumper 7 through the crank jumper hinge shaft 86), the second vertex is rotatably connected to one end of the first connecting rod 16 and one end of the energy storage spring 4 around the tenth center 10S, and the third vertex is provided with a crank limiter 15. Further, the operating mechanism includes two first cranks 14 symmetrically arranged on both sides of the jumper 7 and fixedly connected, and the two first cranks 14 act synchronously.

[0055] like Figure 1 , 4b As shown, the operating mechanism further includes a matching torsion spring 11, which matches with the refastening member 9 and the locking member 10 respectively, so that the two maintain limited position matching.

[0056] like Figure 1 , 4a -6, the operating mechanism also includes a second connecting rod 19, a second crank 22 rotatably arranged around the sixth center 6S, a third connecting rod 23, and a third crank 25 rotatably arranged around the seventh center 7S. One end of the second connecting rod 19 is connected to the slider 18 for rotation, and the other end is connected to the second crank 22 for rotation around the eleventh center 11S to drive the second crank 22 to rotate. The second crank 22 and one end of the third connecting rod 23 are also connected to rotate around the eleventh center 11S. The other end of the third connecting rod 23 is connected to the third crank 25 for rotation around the twelfth center 12S to drive the third crank 25 to rotate. The third crank 25 is used to be connected to the moving contact mechanism of the disconnecting unit; the rocker assembly and the second crank 22 are respectively located at the two ends of the operating mechanism in the vertical direction, and the third crank 25 is located on one side of the operating mechanism in the horizontal direction. Further, the third crank 25 is connected to the moving contact mechanism through a drive shaft 28, and the housing of the disconnecting unit is preferably provided with a drive shaft avoidance hole that matches the moving trajectory of the drive shaft 28. The operating mechanism, whose third crank 25 is used to be connected to the driving of the moving contact mechanism of the circuit breaker, so that the moving contact mechanism and the operating mechanism are arranged side by side in the horizontal direction of the operating mechanism, thereby providing more space for setting the arc extinguishing chamber on one side of the operating mechanism in the vertical direction, so as to arrange the arc extinguishing chamber with larger specifications and better arc extinguishing performance, thereby improving the arc extinguishing performance and breaking performance of the circuit breaker.

[0057] The circuit breaker of the present invention has an operating mechanism that is improved on the basis of the existing four- or five-link conversion structure, and the rotation centers of the operating mechanism and the moving contact mechanism are arranged on the same horizontal line (that is, the operating mechanism and the moving contact mechanism are arranged side by side along the horizontal direction of the operating mechanism). On the premise of ensuring that the operating mechanism can reliably open, close and trip, a crank slider structure (composed of a first crank 14, a first connecting rod 16 and a slider 18) and a four-link structure (such as Figure 4a , 6 As shown, the four-link structure 97 is composed of a second crank 22, a third connecting rod 23 and a third crank 25), which not only realizes the opening and closing actions of the operating mechanism and the moving contact mechanism of the 2P and 3P circuit breakers, but also reserves more design space for the arc extinguishing chamber, and finally realizes the horizontal arc extinguishing chamber design of the circuit breaker.

[0058] like Figure 1 , 4a -5a, 6, the sixth center 6S, the seventh center 7S, the eleventh center 11S and the twelfth center 12S are arranged in parallel and spaced apart and are located at the four vertices of a quadrilateral.

[0059] like Figure 1 , 4b-5a, the second crank 22 is preferably rotatably arranged on the bracket 1 around the sixth center 6S. Further, the second crank 22 is a long strip plate structure, one end of which is rotatably arranged on the bracket 1 around the sixth center 6S, and the other end is rotatably connected to the third connecting rod 23 around the eleventh center 11S. It should be pointed out that the second crank 22 can also be arranged not on the bracket 1, but on a housing structure independent of the operating mechanism, for example: on a housing structure for accommodating the operating mechanism or on a housing of the disconnecting unit.

[0060] like Figure 5b As shown, the bracket 1 is preferably provided with a second crank guide hole 1-1, the second crank 22 and the third connecting rod 23 are preferably rotatably connected through the eleventh shaft 2223, the eleventh shaft 2223 is inserted in the second crank guide hole 1-1, the shape of the second crank guide hole 1-1 matches the motion trajectory of the eleventh shaft 2223, and the second crank guide hole 1-1 is an arc hole.

[0061] like Figure 1 , 4b As shown in FIG. 5a, the third crank 25 is preferably rotatably arranged on the bracket 1 around the seventh center 7S. It should be noted that the third crank 25 may also be arranged not on the bracket 1, but on a housing structure independent of the operating mechanism, for example: on a housing structure for accommodating the operating mechanism or on a housing of a disconnecting unit.

[0062] like Figure 1 , 4b -5a, the third crank 25 is a triangular plate structure, the first vertex of which is rotatably arranged on the bracket 1 around the seventh center 7S, the second vertex is rotatably connected to the third connecting rod 23 around the twelfth center 12S, and the third vertex is rotatably connected to the moving contact mechanism of the breaking unit to drive the moving contact mechanism to rotate. Further, the third crank 25 is an obtuse triangular plate structure, and its first vertex is an obtuse angle.

[0063] like Figure 1 , 4a -4b, the bracket 1 is preferably provided with a third crank guide hole 1-2, the third connecting rod 23 and the third crank 25 are preferably rotatably connected through a twelfth shaft 2325, the twelfth shaft 2325 is inserted into the third crank guide hole 1-2, the shape of the third crank guide hole 1-2 matches the motion trajectory of the twelfth shaft 2325, and the third crank guide hole 1-2 is an arc hole.

[0064] The following will be combined Figure 1 , 4a -5a, 6, the switching process of the operating mechanism between the open state, the closed state, and the tripped state is as follows:

[0065] like Figure 1 , 4a As shown in Figures 5a and 6, the two ends of the swing stroke of the rocker arm 3 of the rocker arm assembly are the first end of the stroke and the second end of the stroke, respectively, and the two ends of the energy storage spring 4 are the first end of the energy storage spring and the second end of the energy storage spring, respectively connected to the rocker arm assembly (the first end of the energy storage spring is preferably connected to the rocker arm 3) and the first crank 14. Specifically, as Figure 1 , 4a -5a, 6, the first end of the stroke of the rocker arm 3 and the second end of the stroke are respectively the right end and the left end of the swing stroke of the rocker arm 3, the upper end of the energy storage spring 4 is the first end of the energy storage spring, and the lower end is the second end of the energy storage spring.

[0066] Combination Figure 1 , 4a -4b, the operation process of the operating mechanism switching from the closed state to the open state is as follows:

[0067] like Figure 1 , 4a -4b, the operating mechanism is in the closing state, at this time, the rocker arm 3 swings toward the second end of the stroke and drives the first end of the energy storage spring to rotate around the second end of the energy storage spring to store energy. When the energy storage spring 4 reaches the first dead point, the energy storage spring 4 has the maximum energy storage. After the energy storage spring 4 rotates past the first dead point, the energy storage spring 4 releases energy to drive the first crank 14 to rotate in the second direction and drives the rocker arm 3 to swing to the second end of the stroke. The first crank 14 drives the slider 18 to slide from the closing position to the opening position along the slide rail through the first connecting rod 16. The slider 18 cooperates with the slide rail limit at the closing position to prevent the slider 18 from sliding further. At the same time, the slider 18 drives the second crank 22 to rotate in the second direction. The second crank 22 drives the third crank 25 to rotate in the second direction through the second connecting rod 19. The third crank 25 drives the moving contact mechanism to rotate in the disconnecting direction to disconnect with the corresponding static contact 42. Specifically, combined with Figure 1 , 4a -4b, when the operating mechanism switches from the closing position to the opening position, the slider 18 moves upward along the slide rail until the slider 18 moves to the upper end of the slide rail (that is, the closing position of the slider 18) and cooperates with its limit to prevent the slider 18 from sliding further, and the second direction is counterclockwise; the axis of the energy storage spring 4 is the first axis, and when the energy storage spring 4 is located at the first dead point position, the energy storage spring 4 reaches the maximum value, and the eighth center 8S is located on the first axis. When the energy storage spring 4 rotates around the second end of the energy storage spring past the first dead point position, the first axis rotates past the eighth center 8S. Therefore, the eighth center 8S can also be regarded as the first dead point position, that is, the first axis of the energy storage spring 4 rotates past the eighth center 8S, which means that the energy storage spring 4 rotates past the first dead point position.

[0068] The operation process of the operating mechanism switching from the open state to the closed state is as follows:

[0069] When the operating mechanism is in the open state, the rocker arm 3 swings toward the first end of the stroke and drives the first end of the energy storage spring 4 to rotate around the second end of the energy storage spring, until the energy storage spring 4 rotates through the first dead point position, the energy storage spring 4 drives the first crank 14 to rotate in the first direction so that the crank limit portion 15 cooperates with the jumper 7 to prevent the first crank 14 from rotating in the first direction. At the same time, the energy storage spring 4 drives the rocker arm 3 to swing to the first end of the stroke, and the first crank 14 drives the slider 18 to slide along the slide rail from the closing position to the opening position through the first connecting rod 16. At the same time, the slider 18 drives the second crank 22 to rotate in the first direction through the second connecting rod 19. The second crank 22 drives the third crank 25 to rotate in the first direction through the third connecting rod 23. The third crank 25 drives the moving contact mechanism to rotate in the closing direction to close with the corresponding static contact 42; the first direction and the second direction are opposite to each other. Specifically, when the operating mechanism switches from the open state to the closed state, the slider 18 moves downward along the slide rail to the closed position; the first direction is the clockwise direction.

[0070] like Figure 1 , 4a As shown in Figure 5a, the process of the operating mechanism switching from the closed state to the tripped state (that is, the tripped open state) is as follows:

[0071] like Figure 1 , 4a -4b, when the operating mechanism is in the closed state, an external force (for example, the force applied to the refastener 9 by the transmission jumper 32 described below) drives the refastener 9 to rotate and release the limit fit with the lock member 10, and the lock member 10 rotates to release the lock fit with the jumper 7. Under the action of the energy storage spring 4, the rocker arm of the rocker arm assembly swings toward the second end of the stroke and the jumper 7 rotates in the second direction and drives the first crank 14 to rotate synchronously until the jumper 7 is limitedly matched with the reset structure 6 of the rocker arm assembly. The first crank 14 drives the slider 18 to slide from the closed position to the open position along the slide rail through the first connecting rod 16. During the above process, the eighth center 8S is always kept on the same side of the axis of the energy storage spring 4. At the same time, the slider 18 drives the second crank 22 to rotate in the second direction through the second connecting rod 19. The second crank 22 drives the third crank 25 to rotate in the second direction through the third connecting rod 23. The third crank 25 drives the moving contact mechanism to rotate in the disconnecting direction to disconnect with the corresponding static contact 42, and the operating mechanism switches to as shown in Figure 5a Specifically, when the operating mechanism switches from the closing state to the tripping state, the slider 18 moves upward from the closing position to the opening tripping position along the slide rail.

[0072] like Figure 5a-6 As shown, the specific process of the operating mechanism switching from the tripped state to the open state (i.e. switching from the tripped state to the open state) is as follows:

[0073] like Figure 5a-5c As shown, when the operating mechanism is in the tripping state, Figure 6 As shown, the external force drives the rocker arm 3 to swing toward the second end of the stroke, releases the external force applied to the refastener 9 to release the limited fit with the lock member 10 (for example, the force applied to the refastener 9 by the transmission jumper 32 described below), and cooperates with the torsion spring 11 to drive the lock member 10 and the refastener 9 to reset so that the two can resume the limited fit. At the same time, the rocker arm 3 drives the jumper 7 to rotate in the first direction through the reset structure 6 to resume the buckle fit with the lock member 10. The jumper 7 drives the slider 18 on the slide rail from the open gate to the open gate through the first crank 14 and the first connecting rod 16. The position first rotates toward the closing position but does not reach the closing position, and then quickly moves back to the opening position. At the same time, the slider 18 drives the second crank 22 through the second connecting rod 19, and the second crank 22 drives the third crank 25 through the third connecting rod 23 to rotate first in the first direction and then in the second direction. The third crank 25 drives the moving contact mechanism from the opening position of the moving contact mechanism to the closing direction first but will not close with the static contact 42, and then rotates in the disconnecting direction to the opening position. After the external force driving the rocker arm 3 to swing is removed, the operating mechanism switches to the opening state. Specifically, when the operating mechanism is released from the tripped state and then locked again, the external force drives the rocker arm 3 to rotate clockwise, and the reset structure 6 of the rocker arm assembly drives the jumper 7 to rotate clockwise around the first center 1S, and the jumper 7 drives the slider 18 to move slightly downward along the slide rail through the first crank 14 and the first connecting rod 16, but will not move to the closed position; then, the rocker arm 3 drives the energy storage spring 4 to rotate clockwise around the second end of the energy storage spring so that the axis of the energy storage spring 4 rotates through the eighth center 8S, and the energy storage spring 4 drives the first crank 14 to rotate counterclockwise around the eighth center 8S. The first crank 14 drives the slider 18 to slide upward along the slide rail to the opening position through the first connecting rod 15; at the same time, the slider 18 drives the second crank 22 through the second connecting rod 19, and the second crank 22 drives the third crank 25 through the third connecting rod 23 to rotate clockwise by a small angle first and then rotate counterclockwise back to its original position, and the third crank 25 drives the moving contact mechanism to rotate a small angle from the opening position to the closing direction, and the moving contact mechanism will not close with the static contact 42, and then the moving contact mechanism rotates back to the opening position driven by the third crank 25.

[0074] Theoretically, after the operating mechanism is released from the closed state or opened, the eleventh shaft 2223 is limited by the second crank guide hole 1-1, the twelfth shaft 2325 is limited by the third crank guide hole 1-2, and the slider 18 is limited by the slide rail, which occur simultaneously. However, due to actual processing errors, the above three processes are difficult to carry out simultaneously. In this embodiment, the eleventh shaft 2223 is limited before the other two, which is beneficial to increase the torque of the energy storage spring 4 to overcome the friction of the rotating shaft (that is, the contact support of the moving contact mechanism) when closing the switch.

[0075] like Figure 4b As shown, the bracket 1 includes two bracket side panels arranged relatively at intervals, each bracket side panel includes a first side panel portion and a second side panel portion connected to each other, the rocker assembly, the jumper 7, the locker 10, the re-fastener 9 and the second crank 22 are respectively rotatably arranged on the first side panel portion, the two ends of the first side panel portion in the vertical direction are respectively provided with a V-shaped groove and a slide rail, the second side panel portion is connected to one end of the first side panel portion in the horizontal direction, the rocker assembly is swingably arranged in the V-shaped groove, and the third crank 25 is rotatably arranged on the second side panel portion. Further, as Figure 4b direction shown, Figure 4b The up and down direction is the vertical direction of the first part of the side panel, Figure 4b The left and right direction is the horizontal direction of the first part of the side panel.

[0076] like Figure 4b-5c As shown, the bracket 1 preferably includes a bracket connecting plate, and the two ends of the bracket connecting plate are respectively connected to the two bracket side plates by bending, so that the bracket 1 as a whole forms a U-shaped structure.

[0077] Combination Figure 1 , 4a -6, in the operating mechanism, two slide rails are respectively arranged on the two bracket side plates, and the two ends of the slider 18 are respectively slidably arranged in the two slide rails. The two sliders 18 are preferably connected by a slider shaft 8, and the two second cranks 22, the two second connecting rods 19, the two third connecting rods 23 and the two third cranks 25 are symmetrically arranged on both sides of the two bracket side plates. The rocker arm 3 includes two rocker arm support legs arranged opposite to each other, and the two rocker arm support legs are respectively arranged in two V-shaped grooves. The first connecting rod 16 and the second connecting rod 19 are symmetrically arranged and connected in parallel, which effectively reduces the position error generated during the transmission process of the left and right connecting rods, and reduces the number of parts, ensuring the reliability of the multi-link movement and the consistency of the left and right poles, which has an important impact on improving the overall performance of the circuit breaker.

[0078] like Figure 4a , 5a -5b, 6, the operating mechanism is connected to each disconnecting unit through three parallel connecting shafts, and the three connecting shafts are respectively the first connecting shaft 1a, the second connecting shaft 1b and the third connecting shaft 1c. Further, the operating mechanism is arranged across a disconnecting unit, and the two bracket side plates of the bracket 1 are located on both sides of the disconnecting unit. One end of the operating mechanism in the vertical direction is connected to the housing of the disconnecting unit through three connecting shafts, and the three connecting shafts are spaced apart along the horizontal direction of the operating mechanism.

[0079] like Figure 1-3As shown in 7-11, the circuit breaker of the present invention also includes a fast tripping device, which is used to realize the fast tripping and opening of the circuit breaker when a short circuit fault occurs in the circuit where the circuit breaker is located, so as to realize short circuit protection. Specifically, when a short circuit fault occurs in the circuit where the circuit breaker is located, the moving contact 41 of the breaking unit is repelled by the electric repulsive force and rotates relative to the contact support 40, and the moving contact 41 drives the refastener 9 of the operating mechanism to rotate through the transmission path, and the refastener 9 releases the limit fit with the lock member 10, and the lock member 10 rotates to release the snap fit with the jumper 7, so that the operating mechanism is tripped and opened. Further, a driving gap is provided in the transmission path from the moving contact 41 to the operating mechanism, and the driving gap causes the moving contact 41 to rotate through a preset angle before starting to drive the operating mechanism to trip, so as to avoid the operating mechanism being triggered to trip and open when the moving contact 41 bounces due to the hard contact between the moving contact 41 and the static contact 42 when the circuit breaker is normally closed.

[0080] like Figure 1-3 As shown, the fast tripping device includes an operating mechanism and a contact system (that is, a contact system of a disconnecting unit), the moving contact mechanism of the contact system includes a contact support 40 rotatably arranged around a seventh center 7S, a moving contact 41 arranged on the contact support 40 and rotatably arranged relative to the contact support 40, a contact spring 47 whose two ends are respectively connected to the contact support 40 and the moving contact 41, a first transmission structure 43 arranged on the contact support 40 and transmission-coordinated with the moving contact 41, and a first traction rod 34 and a transmission trip buckle 32 that are snap-fitted; when a short-circuit current flows through the contact system, that is, when a short-circuit fault occurs in the circuit where the circuit breaker is located, the moving contact 41 is rotated relative to the contact support 40 by the electric repulsion force between the moving contact 41 and the static contact 42, the moving contact 41 drives the first traction rod 34 to actuate through the first transmission structure 43 to release the snap-fit ​​with the transmission trip buckle 32, the transmission trip buckle 32 actuates to drive the operating mechanism to trip, and the operating mechanism switches to a tripped and disconnected state. Furthermore, after the transmission jump buckle 32 and the first traction rod 34 are released from the buckle fit, the re-fastening member 9 of the driving operating mechanism is rotated to release the limiting fit with the locking member 10 .

[0081] like Figure 2-3As shown, the moving contact 41 is rotatably arranged on the contact support 40 around the seventh center 7S; when the moving contact 41 and the stationary contact 42 are normally closed or disconnected, the contact spring 47 is located at the first position, and the seventh center 7S is located on one side of the axis of the contact spring 47; when the moving contact 41 is repelled by the electric repulsion between the moving contact 41 and the stationary contact 42 so that the moving contact 41 rotates to the repelled position relative to the contact support 40, the moving contact 41 drives the contact spring 47 to swing to the second position, and the seventh center 7S is located on the other side of the contact spring 47, and the contact spring 47 applies a force to the moving contact 41 to keep it in the repelled position, so as to prevent the moving contact 41 from closing with the stationary contact 42 again. Further, the repelled position of the moving contact 41 is the same as the disconnected position.

[0082] When the contact spring 47 is repelled, the contact spring 47 swings from the first position to the second position through the dead point position. When the contact spring 47 is at the dead point position, the axis of the contact spring 47 coincides with the seventh center 7S, that is, the seventh center 7S is located on the axis of the contact spring 47.

[0083] like Figure 1-3 As shown, the moving contact mechanism, the transmission trip latch 32 and the first traction rod 34 are located on one side of the operating mechanism in the horizontal direction, and the rocker arm assembly of the operating mechanism is arranged at one end of the operating mechanism in the vertical direction. The rotation axes of the rocker arm assembly, the moving contact mechanism, the transmission trip latch 32 and the first traction rod 34 are parallel to each other.

[0084] Combination Figure 5b and 6 As shown, when the operating mechanism is re-engaged from the tripped opening state (the operating mechanism will switch to the opening state after being re-engaged from the tripped opening state), the rocker arm assembly drives the transmission jumper 32 to reset and resume the snap-fitting with the first traction rod 34, and the locking member 10 and the re-engaging member 9 are respectively reset under the action of the cooperating torsion spring 11 to resume the limit fit, and the jumper 7 is also driven by the reset structure 6 of the rocker arm assembly to rotate to snap-fit ​​with the locking member 10 again, so as to re-engage the operating mechanism, and the operating mechanism enters the opening state after being re-engaged. Further, the rocker arm 3 includes a rocker arm driving part 2a, and the transmission jumper 32 includes a transmission jumper actuated part 32-3, and the rocker arm driving part 2a cooperates with the transmission jumper actuated part 32-3 in transmission to drive the transmission jumper 32 to reset. Further, as Fig.11 As shown, the transmission jump buckle driven part 32-3 is a boss protrudingly arranged on one side of the transmission jump buckle 32. Figure 5b and 6 As shown, the rocker arm driving part 2a is a push plate that cooperates with the boss transmission.

[0085] like Figure 1-3As shown, the fast tripping device also includes a tripping device housing and a second transmission structure. The tripping device housing is realized by the housing of the disconnecting unit. The operating mechanism, the first traction rod 34 and the transmission trip buckle 32 are all arranged outside the tripping device housing. The contact system and the first transmission structure 43 are all arranged inside the tripping device housing (the housing of the disconnecting unit). One end of the second transmission structure is located inside the tripping device housing (the housing of the disconnecting unit) and cooperates with the first transmission structure 43 for transmission, and the other end is located outside the tripping device housing (the housing of the disconnecting unit) and cooperates with the first traction rod 34 for transmission. The above structural design realizes the isolation of the operating mechanism and the conductive structure (contact system) of the circuit breaker, which is beneficial to improve safety and ensure the operator's electricity safety.

[0086] like Figure 1-3 As shown in 8-9, the second transmission structure includes a primary push rod and a secondary push rod which are coaxially and synchronously rotated, the primary push rod includes a primary push rod arm 44-0 and a primary push rod shaft 44-1, the secondary push rod includes a secondary push rod arm 45-0 and a secondary push rod shaft 45-1 arranged on the secondary push rod arm 45-0, the primary push rod arm 44-0 is located in the tripping device housing (the housing of the disconnecting unit), and the secondary push rod is located outside the tripping device housing (the housing of the disconnecting unit); the push rod 44-0 is transmission-coordinated with the first transmission structure 43 and is fixedly connected to one end of the primary push rod shaft 44-1, the primary push rod shaft 44-1 is rotatably inserted into the tripping device housing (the housing of the disconnecting unit), the other end of the primary push rod shaft 44-1 passes through the tripping device housing (the housing of the disconnecting unit) and is connected to the secondary push rod arm 45-0, and the secondary push rod arm 45-0 is transmission-coordinated with the first traction rod 34 through the secondary push rod shaft 45-1. Further, one end of the primary push rod arm 44-0 is in transmission cooperation with the first transmission structure 43, and the other end is connected to the primary push rod shaft 44-1, one end of the secondary push rod arm 45-0 is connected to the primary push rod shaft 44-1, and the other end is provided with the secondary push rod shaft 45-1. Further, the secondary push rod arm 45-0 is provided with a secondary push rod arm connecting hole 45-00, which is a polygonal hole, and one end of the primary push rod shaft 44-1 is provided with a primary push rod shaft connecting portion 44-10, which is a polygonal column, and the polygonal hole and the polygonal column match in shape and are plug-fitted.

[0087] The driving gap is preferably arranged between the first transmission structure 43 and the primary push rod arm 44 - 0 .

[0088] The driving gap is preferably provided between the secondary push rod shaft 45 - 1 and the first traction rod 34 .

[0089] like Figure 1-3 As shown, the first transmission structure 43 is rotatably disposed on the contact support 40 .

[0090] like Figure 2-3 As shown, the first transmission structure 43 and the moving contact 41 can achieve transmission matching through existing technology, for example: Figure 1-3 As shown, the first transmission structure 43 is driven and matched with the contact spring 47, and the first transmission structure 43 rotates with the rotation of the contact spring 47. Further, the first transmission structure 43 and the contact spring 47 are coaxial and rotate synchronously. Figure 7 As shown, the first transmission structure 43 includes a first transmission structure mounting portion 43-0 and a first transmission structure driven portion 43-1, the first transmission structure mounting portion 43-0 is preferably provided with a first transmission structure shaft hole 43-00, and the first transmission structure 43 is rotatably sleeved on the first mounting shaft 48-0 through the first transmission structure shaft hole 43-00; the contact spring 47 includes a contact spring body 47-1 and a contact spring first end 47-0 and a contact spring second end 47-1 respectively connected to both ends of the contact spring body 47-1. -2, the first end 47-0 of the contact spring includes a first end mounting portion and a first end connecting portion, and the two ends of the first end connecting portion are respectively connected to the first end mounting portion and the contact spring body 47-1; the first transmission structure mounting portion 43-0 is rotatably arranged on the contact support 40 through the first mounting shaft 48-0, the first end mounting portion is rotatably mounted on the first mounting shaft 48-0, the first transmission structure driven portion 43-1 is arranged on the first end connecting portion, and the second end 47-2 of the contact spring is connected to the moving contact 41 through the second mounting shaft 48-1. Further, the first transmission structure driven portion 43-1 is provided with a first transmission structure connecting hole, and the first transmission structure driven portion 43-1 is sleeved on the first end connecting portion through the first transmission structure connecting hole.

[0091] Alternatively, when the movable contact 41 is pushed away, it rotates and presses the first transmission structure 43 to rotate. Further, the movable contact 41 is provided with a movable contact boss, and the first transmission structure 43 is provided with a first transmission structure driven arm, and the movable contact boss cooperates with the first transmission structure driven arm. Further, the driving gap is preferably provided between the first transmission structure 43 and the movable contact 41.

[0092] As another embodiment, the first transmission structure 43 is slidably disposed on the contact support 40 . When the moving contact 41 is repelled, the first transmission structure 43 is driven to slide relative to the contact support 40 and trigger the first traction rod 34 to release the buckle engagement with the transmission jumper 32 .

[0093] like Figure 7 As shown, the first transmission structure 43 also includes a first transmission structure driving arm 43-2 connected to the first transmission structure mounting portion 43-0, and the first transmission structure driving arm 43-2 is in transmission cooperation with the first push rod arm 44-0 of the first push rod.

[0094] like Figure 1-3 As shown in FIG. 5b , the first traction rod 34 is rotatably arranged around the fifth center 5S. The first traction rod 34 is preferably rotatably arranged on the trip device housing (housing of the disconnecting unit) through the first traction rod shaft 58 .

[0095] like Figure 1-3 As shown in FIG. 5 b , the transmission jump buckle 32 is rotatably arranged around the ninth center 9S, and the transmission jump buckle 32 is preferably rotatably arranged on the bracket 1 through the transmission jump buckle shaft 61 .

[0096] As another embodiment, the transmission trip button 32 is rotatably arranged around the ninth center 9S on the trip device housing (housing of the disconnecting unit).

[0097] like Figure 1 , 4a As shown in Figures 5b-6, when the first traction rod 34 and the transmission jump buckle 32 are snap-fitted, the two have a tendency to rotate in opposite directions, so that the parts of the first traction rod 34 and the transmission jump buckle 32 that match each other have a tendency to approach each other (the first traction rod snap arm 34-2 and the transmission jump buckle snap end 32-2 have a tendency to approach each other), making the snap-fitting of the two more reliable.

[0098] like Figure 1 , 4a As shown in , 5a-6, the fast trip device further includes a first traction rod reset elastic member 36, the first traction rod reset elastic member 36 applies a force to the first traction rod 34, so that the first traction rod 34 and the transmission trip buckle 32 maintain a snap fit. Fig.10 As shown, the first traction rod 34 includes a first traction rod body 34-0 and a first traction rod spring arm 34-4 arranged on the first traction rod body 34-0, and the first traction rod 34 is rotatably arranged around the fifth center 5S through the first traction rod body 34-0 (preferably rotatably arranged on the trip device housing); the first traction rod reset elastic member 36 is a tension spring, one end of which is connected to the first traction rod spring arm 34-4, and the other end is fixedly arranged (preferably fixed on the trip device housing).

[0099] As another embodiment, the first traction rod reset elastic member 36 is a torsion spring, which is sleeved on the first traction rod shaft 58, with one end cooperating with the first traction rod 34 and the other end fixedly disposed on the trip device housing.

[0100] like Figure 1 and 5cAs shown, the fast trip device also includes a transmission trip buckle elastic member 60, which applies a force to the transmission trip buckle 32 to drive the operating mechanism to trip. Further, the transmission trip buckle elastic member 60 is a torsion spring, which is sleeved on the transmission trip buckle shaft 61, one end of which cooperates with the transmission trip buckle 32, and the other end is fixedly arranged (preferably fixedly arranged on the trip device housing). Further, the fast trip device also includes a torsion spring limiting shaft 62 arranged side by side and spaced apart from the transmission trip buckle shaft 61, and one end of the fixed arrangement of the torsion spring cooperates with the torsion spring limiting shaft 62.

[0101] like Figure 1-3 As shown in 10, the first traction rod 34 includes a first traction rod body 34-0 and a first traction rod driven arm 34-1 and a first traction rod latch arm 34-2 respectively arranged on the first traction rod body 34-0. The first traction rod 34 is rotatably arranged by the first traction rod body 34-0, the first traction rod driven arm 34-1 is in transmission cooperation with the second transmission structure, and the first traction rod latch arm 34-2 is in latch cooperation with the transmission jump latch 32. Furthermore, the first traction rod driven arm 34-1 is in transmission cooperation with the secondary push rod shaft 45-1 of the secondary push rod. When the secondary push rod rotates around the primary push rod shaft 44-1, the secondary push rod shaft 45-1 presses against the traction rod driven arm 34-1 to rotate the first traction rod 34; the first traction rod body 34-0 is a cylindrical structure, in the middle of which a first traction rod shaft hole 34-00 is provided. The first traction rod body 34-0 is sleeved on the first traction rod shaft 58 through the first traction rod shaft hole 34-00, and the first traction rod shaft 58 is provided on the trip device housing (housing of the disconnecting unit).

[0102] like Figure 1 , 4a , 5a-6, 11, the transmission jump buckle 32 includes a transmission jump buckle pivot end 32-0 and a transmission jump buckle buckle end 32-2 respectively arranged at both ends thereof, and the transmission jump buckle 32 is rotatably arranged around the ninth center 9S through the transmission jump buckle pivot end 32-0 and is buckled with the first traction rod 34 through the transmission jump buckle buckle end 32-2. Further, the transmission jump buckle pivot end 32-2 is provided with a transmission jump buckle shaft hole 32-00, and the transmission jump buckle pivot end 32-2 is sleeved on the transmission jump buckle shaft 61 through the transmission jump buckle shaft hole 32-00.

[0103] like Figure 1 , 4aAs shown in , 5a-6, 10 and 11, the first traction rod buckle arm 34-2 of the first traction rod 34 is provided with a buckle arm hook 34-20, and the transmission jump buckle buckle end 32-2 is provided with a buckle end hook 32-20, and the buckle arm hook 34-20 and the buckle end hook 32-20 are buckled together to form a buckle structure 3a. Further, the buckle arm hook 34-20 and the buckle end hook 32-20 are both half-arrow hooks, and when the buckle arm hook 34-20 and the buckle end hook 32-20 are buckled together, the two have a tendency to move toward each other.

[0104] like Figure 1 , 4a As shown in FIGS. 5a-6 and 11, the transmission jumper 32 is a C-shaped structure, the opening of which faces the seventh center 7S (the rotation center of the moving contact mechanism and the third crank 25), and the back of the C-shaped structure is provided with a transmission jumper driving surface 32-1 that is transmission-matched with the refastener 9 of the operating mechanism. After the transmission jumper 32 contacts and snaps with the first traction rod 34, the transmission jumper 32 rotates, and the refastener 9 is driven to rotate through the transmission jumper driving surface 32-1 to release the limit fit with the lock member 10, and finally the operating mechanism is released. The transmission jumper 32 is designed as a C-shaped structure, which cleverly avoids the third crank 25 used to connect the moving contact mechanism, and fully utilizes the internal space of the circuit breaker.

[0105] like Figure 1 , 4a , 5a and 6, the connecting line of the two ends of the transmission jump buckle 32 is a first connecting line, the first connecting line and the transmission jump buckle 32 form a D-shaped space, the seventh center 7S is always located outside the D-shaped space, and the seventh center 7S and the transmission jump buckle 32 are located on both sides of the first connecting line. Further, the angle between the connecting line of the two ends of the transmission jump buckle 32 and the seventh center 7S is an obtuse angle.

[0106] like Figure 1 and 5cAs shown, the circuit breaker of the present invention further includes a test button 46 slidably arranged on the housing of the tripping device (housing of the disconnecting unit). When the test button 46 is pressed by an external force to slide, the test button 46 drives the first traction rod 34 to rotate and releases the snap fit with the transmission tripping buckle 32; the test button 46 realizes the passive operation to trip the operating mechanism. Further, the test button 46 is in transmission fit with the first traction rod passive arm 34-1 of the first traction rod 34, and one end of the test button 46 is preferably relatively matched with the free end of the first traction rod passive arm 34-1. When the test button 46 is pressed to slide, the test button 46 presses against the first traction rod passive arm 34-1 to rotate the first traction rod 34, and the sliding direction of the test button 46 is preferably perpendicular to the rotation axis of the first traction rod 34. Further, a first design distance is provided between the test button 46 and the first traction rod passive arm 34-1 to avoid accidental contact with the test button 46 to trigger the tripping of the operating mechanism.

[0107] The circuit breaker of the present invention further comprises a test button elastic reset member 24, which applies a force to the test button 46 to make it slide in a direction to avoid the first traction rod actuated arm 34-1. The test button elastic reset member 24 is preferably a linear spring, which is sleeved on the test button 46, one end of which cooperates with the test button 46, and the other end cooperates with the trip device housing (housing of the disconnecting unit).

[0108] like Figure 5c As shown, the circuit breaker of the present invention also includes a thermal magnetic tripping mechanism. When a short circuit or overload fault occurs in the circuit where the circuit breaker is located, the thermal magnetic tripping mechanism drives the operating mechanism to trip to achieve the short circuit or overload protection function. Furthermore, in the circuit breaker of the present invention, each disconnecting unit cooperates with a group of thermal magnetic tripping mechanisms; or, when the circuit breaker of the present invention is of nP+N type, n≥1, each of its P-pole disconnecting units cooperates with a group of thermal magnetic tripping mechanisms, and the N-pole disconnecting unit is not provided with a corresponding thermal magnetic tripping mechanism. Furthermore, the thermal magnetic tripping mechanism is arranged in the housing of the corresponding disconnecting unit.

[0109] In this embodiment, Figure 5c As shown, the thermal-magnetic tripping mechanism includes a second traction rod 49 that is rotatably arranged, and the second traction rod 49 is drivingly connected to the first traction rod 34. When a short circuit or overload fault occurs in the circuit where the circuit breaker is located, the thermal-magnetic tripping mechanism drives the first traction rod 34 to move through the second traction rod 49 to release the snap-fit ​​with the transmission trip buckle 32, and the transmission trip buckle 32 moves to drive the operating mechanism to trip; that is, when a short circuit or overload fault occurs in the circuit where the circuit breaker is located, the thermal-magnetic tripping mechanism drives the second traction rod 49 to rotate, and the second traction rod 49 simultaneously drives the first traction rod 34 to rotate to release the snap-fit ​​with the transmission trip buckle 32.

[0110] like Figure 5cAs shown, the operating mechanism, the transmission tripping buckle 32, the first traction rod 34 and the thermal-magnetic tripping mechanism are arranged in sequence along the horizontal direction of the operating mechanism.

[0111] like Figure 5c As shown, the rotation axes of the second traction rod 49, the transmission jumper 32 and the first traction rod 34 are parallel to each other.

[0112] like Figure 5c and 10 As shown, the first traction rod 34 also includes a first traction rod connecting arm 34-3 provided on the first traction rod body 34-0, the second traction rod 49 includes a second traction rod body 49-0 and a second traction rod connecting arm 49-1 provided on the second traction rod body 49-0, and the second traction rod connecting arm 49-1 is drivingly connected to the first traction rod 34-3 through a connecting rod 55. Further, both ends of the connecting rod 55 are respectively hinged to the second traction rod connecting arm 49-1 and the first traction rod connecting arm 34-3 through a first hinge shaft 55-0 and a second hinge shaft 55-1.

[0113] like Fig.10 As shown, an embodiment of the first traction rod 34 is shown: the first traction rod 34 includes a first traction rod body 34-0 and a first traction rod driven arm 34-1, a first traction rod buckle arm 34-2, and a first traction rod connecting arm 34-3 respectively arranged on the first traction rod body 34-0; the first traction rod 34-0 is a cylindrical structure; the first traction rod driven arm 34-1, the first traction rod buckle arm 34-2, and the first traction rod connecting arm 34-3 are sequentially distributed along the circumferential direction of the first traction rod body 34-0. Further, the angle between the first traction rod buckle arm 34-2 and the first traction rod driven arm 34-1 is an obtuse angle.

[0114] Preferably, Fig.10 As shown, the first traction rod 34 also includes a first traction rod spring arm 34-4, and the first traction rod passive arm 34-1, the first traction rod spring arm 34-4, the first traction rod buckle arm 34-2, and the first traction rod connecting arm 34-3 are sequentially distributed along the circumferential direction of the first traction rod body 34-0.

[0115] In the circuit breaker of the present invention, the first traction rod 34 can be simultaneously matched with the moving contact 41, the test button 46 and the second traction rod 49 to enable the operating mechanism to be opened and tripped in three different ways.

[0116] like Figure 5cAs shown, it is an embodiment of the thermal magnetic tripping mechanism: the thermal magnetic tripping mechanism includes a thermal magnetic tripping yoke 54, a thermal magnetic tripping armature 53, a bimetallic element 51 and an armature transmission member 50. The thermal magnetic tripping armature 53 is rotatably arranged on the thermal magnetic tripping yoke 54 through an armature shaft 52-1, and the armature transmission member 50 is rotatably arranged on the thermal magnetic tripping yoke 54 through a transmission member shaft 52-2. The thermal magnetic tripping armature 53 is driven and matched with the second traction rod 49 through the armature transmission member 50 to drive the second traction rod 49 to rotate when a short circuit fault occurs in the circuit where the circuit breaker is located. The bimetallic element 51 is also driven and matched with the second traction rod 49 to drive the second traction rod 49 to rotate when an overload fault occurs in the circuit where the circuit breaker is located. The thermal magnetic tripping yoke 54, the thermal magnetic tripping armature 53, the bimetallic element 51 and the armature transmission member 50 can all be realized by existing technologies, and will not be described one by one here.

[0117] like Fig.12 As shown, the second traction rod 49 also includes a second traction rod armature matching arm 49-2 and a second traction rod bimetal matching arm 49-3 respectively arranged on the second traction rod body 49-0, which are respectively matched with the armature transmission member 50 and the bimetallic element 51; the second traction rod body 49-0 is rotatably arranged on the housing of the breaking unit through the second traction rod shaft 56. Furthermore, a second design distance is set between the armature transmission member 50 and the second traction rod armature matching arm 49-2 to avoid the operating mechanism being tripped due to product vibration.

[0118] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. An operating mechanism of a circuit breaker, comprising a bracket (1), a rocker assembly, a tripping member (7), a locking member (10) and a re-locking member (9) respectively rotatably arranged on the bracket (1), a first crank (14), an energy storage spring (4), a slide rail fixedly arranged relative to the bracket (1), a slider (18), a first connecting rod (16), a second connecting rod (19), and a second crank (22) rotatably arranged around a sixth center (6S); the locking member (10) is snap-fitted with the tripping member (7) and is limitedly matched with the re-locking member (9); one end of the first crank (14) is rotatably arranged around an eighth center (8S) On the jumper (7), the other end is connected to one end of the first connecting rod (16) and one end of the energy storage spring (4) so ​​as to be rotationally connected around the tenth center (10S), the other end of the energy storage spring (4) is connected to the rocker assembly, the other end of the first connecting rod (16) is connected to the slider (18) so as to be rotationally connected, the slider (18) is slidingly arranged on the slide rail, one end of the second connecting rod (19) is connected to the slider (18) so as to be rotationally connected, and the other end is connected to the second crank (22) so as to be rotationally connected around the eleventh center (11S) so as to drive the second crank (22) to rotate; when the operating mechanism is in the open or tripped state, the slide rail and the slider (18) are limitedly matched to prevent the slider (18) from sliding; it is characterized in that: The operating mechanism also includes a third connecting rod (23) and a third crank (25) rotatably arranged around a seventh center (7S); the second crank (22) and one end of the third connecting rod (23) are connected to each other rotatably around an eleventh center (11S); the other end of the third connecting rod (23) is connected to the third crank (25) rotatably around a twelfth center (12S) to drive the third crank (25) to rotate; the rocker arm assembly and the second crank (22) are respectively located at two ends of the operating mechanism in the vertical direction of the operating mechanism, and the third crank (25) is located on one side of the operating mechanism in the horizontal direction of the operating mechanism.

2. The operating mechanism of the circuit breaker according to claim 1, characterized in that: The sixth center (6S), the seventh center (7S), the eleventh center (11S) and the twelfth center (12S) are arranged in parallel and spaced apart and are located at the four vertices of a quadrilateral; the second crank (22) is rotatably arranged on the bracket (1) around the sixth center (6S), and the third crank (25) is rotatably arranged on the bracket (1) around the seventh center (7S).

3. The operating mechanism of the circuit breaker according to claim 1, characterized in that: The bracket (1) is provided with a second crank guide hole (1-1), the second crank (22) and the third connecting rod (23) are rotatably connected via an eleventh shaft (2223), the eleventh shaft (2223) is inserted into the second crank guide hole (1-1), and the shape of the second crank guide hole (1-1) matches the motion trajectory of the eleventh shaft (2223); And / or, the bracket (1) is provided with a third crank guide hole (1-2), the third connecting rod (23) and the third crank (25) are rotationally connected via a twelfth shaft (2325), the twelfth shaft (2325) is inserted into the third crank guide hole (1-2), and the shape of the third crank guide hole (1-2) matches the motion trajectory of the twelfth shaft (2325).

4. The operating mechanism of the circuit breaker according to claim 1, characterized in that: The second crank (22) is a strip plate structure, one end of which is rotatably arranged around the sixth center (6S), and the other end of which is rotatably connected to the third connecting rod (23) and the second connecting rod (19) around the eleventh center (11S).

5. The operating mechanism of the circuit breaker according to claim 1, characterized in that: The third crank (25) is a triangular plate structure, the first vertex of which is rotatably arranged around the seventh center (7S), the second vertex is rotatably connected to the third connecting rod (23) around the twelfth center (12S), and the third vertex is used to be rotatably connected to the moving contact mechanism of the circuit breaker.

6. The operating mechanism of the circuit breaker according to claim 5, characterized in that: The third crank (25) is an obtuse triangle plate structure, and its first vertex angle is an obtuse angle.

7. The operating mechanism of the circuit breaker according to claim 2, characterized in that: The bracket (1) comprises two bracket side plates arranged at a relative interval, each bracket side plate comprises a first side plate portion and a second side plate portion connected to each other, a rocker assembly, a jumper (7), a locker (10), a re-fastener (9) and a second crank (22) are respectively rotatably arranged on the first side plate portion, two ends of the first side plate portion in a vertical direction are respectively provided with a V-shaped groove and a slide rail, the second side plate portion is connected to one end of the first side plate portion in a horizontal direction, the rocker assembly is swingably arranged in the V-shaped groove, and a third crank (25) is rotatably arranged on the second side plate portion.

8. The operating mechanism of the circuit breaker according to claim 1, characterized in that: The slide rail is a groove-shaped structure or a hole-shaped structure.

9. The operating mechanism of the circuit breaker according to claim 1, characterized in that: The slide rail is arranged on the bracket (1).

10. The operating mechanism of the circuit breaker according to claim 1, characterized in that: The operating mechanism also includes a first traction rod (34) and a transmission trip buckle (32) which are snap-fitted and respectively rotatably arranged. When a short circuit and / or overload fault occurs in the circuit where the circuit breaker is located, the first traction rod (34) is driven to rotate, releasing the snap-fit ​​with the transmission trip buckle (32), and the transmission trip buckle (32) rotates to drive the operating mechanism to trip.

11. The operating mechanism of the circuit breaker according to claim 10, characterized in that: The operating mechanism also includes a thermal magnetic tripping mechanism, which drives the first traction rod (34) to rotate and releases the snap fit with the transmission tripping buckle (32) when a short circuit or overload fault occurs in the circuit breaker.

12. The operating mechanism of the circuit breaker according to claim 10, characterized in that: When a short circuit occurs in the circuit where the circuit breaker is located, the first traction rod (34) is driven by the moving contact (41) of the circuit breaker to release the snap fit with the transmission tripping buckle (32).

13. The operating mechanism of the circuit breaker according to claim 10, characterized in that: The operating mechanism also includes a slidably arranged test button (46). When an external force drives the test button (46) to slide, the test button (46) drives the first traction rod (34) to move and release the buckle fit with the transmission jump buckle (32).

14. The operating mechanism of the circuit breaker according to claim 1, characterized in that: When the operating mechanism is locked again from the tripped and opened state, the rocker arm assembly of the operating mechanism drives the transmission tripping buckle (32) to reset and resume the buckle engagement with the first traction rod (34).

15. A circuit breaker, comprising an operating mechanism of the circuit breaker as described in any one of claims 1 to 14 and at least one group of disconnecting units, the disconnecting unit comprising a contact system and an arc extinguishing chamber, the contact system comprising a moving contact mechanism and a stationary contact (42) used in conjunction with each other, the moving contact mechanism comprising a contact support (40) rotatably arranged around a seventh center (7S) and a moving contact (41) arranged on the contact support (40), the contact support (40) being drivingly connected to a third crank (25), and a rocker arm assembly, a second crank (22) and an arc extinguishing chamber being arranged in sequence along the vertical direction of the operating mechanism.

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