Operating mechanism of circuit breaker, quick tripping device, and circuit breaker

Abstract

An operating mechanism of a circuit breaker, comprising: a support (1); a rocker arm assembly, a tripping fastener (7), a locking fastener (10), and a refastening piece (9) that are rotatably provided on the support (1), separately; a first crank (14); an energy storage spring (4); a sliding rail (1-0) fixedly arranged relative to the support (1); a sliding block (18); a first connecting rod (16); a second connecting rod (19); a second crank (22) rotatably arranged about a sixth center (6S); a third connecting rod (23); and a third crank (25) rotatably arranged about a seventh center (7S), wherein the third crank (25) is located on one side of the operating mechanism in the horizontal direction of the operating mechanism. Switching between three working states can be achieved without connection to a contact system; moreover, the layout of the contact system can be changed, so as to provide a larger installation space for an arc-extinguishing chamber.

Description

Circuit breaker operating mechanism, fast tripping device and circuit breaker Technical Field

[0001] This invention relates to the field of low-voltage electrical appliances, and more specifically to an operating mechanism for a circuit breaker, a fast tripping device for a circuit breaker including the operating mechanism, and a circuit breaker including the operating mechanism. Background Technology

[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 continuously develop towards smaller size and higher performance.

[0003] To meet the high-voltage breaking requirements of DC1000V and DC1500V for molded case circuit breakers in photovoltaic power distribution lines, the arc voltage of the arc-extinguishing chamber is often increased. However, the operating mechanism of traditional 250A molded case circuit breakers is a four- or five-bar linkage structure. The rotation axis of the operating mechanism and the moving contact mechanism is arranged vertically along the operating mechanism, which means 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, the size of the arc-extinguishing chamber cannot be significantly increased due to the limitation of the product's external dimensions, making it difficult to significantly increase the arc voltage of the arc-extinguishing chamber. Secondly, in the operating mechanism of existing molded case circuit breakers, the components are highly interconnected. Under the premise of meeting other parameters, it is not convenient to increase the opening distance between the moving and stationary contacts by adjusting the fit dimensions between the linkages, nor can it match a large-sized arc-extinguishing chamber.

[0004] In addition, existing molded case circuit breakers have problems with their fast tripping devices, such as complex structure, large space occupation, and poor reliability.

[0005] In addition, existing molded case circuit breakers often achieve short circuit and overload protection by setting a thermal-magnetic trip mechanism. However, the transmission structure between the thermal-magnetic trip mechanism and the operating mechanism has problems such as complex structure, occupying a lot of installation space, and poor reliability.

[0006] Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide an operating mechanism for a circuit breaker that can switch between three working states without connecting to the contact system, and can also change the layout of the contact system to provide more installation space for the arc extinguishing chamber; it also provides a circuit breaker including the operating mechanism, which has good arc extinguishing performance.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] An operating mechanism for a circuit breaker includes a bracket, a rocker arm assembly, a trip fastener, a locking fastener, and a re-fastener rotatably mounted on the bracket, a first crank, an energy storage spring, a slide rail fixed relative to the bracket, a slider, a first connecting rod, a second connecting rod, and a second crank rotatably mounted about a sixth center. The locking fastener engages with the trip fastener and is also limited by the re-fastener. One end of the first crank is rotatably mounted on the trip fastener about an eighth center, and the other end is rotatably connected to one end of the first connecting rod and one end of the energy storage spring about a tenth center. The other end of the energy storage spring is connected to the rocker arm assembly, and the other end of the first connecting rod is rotatably connected to the slider, which is slidably mounted 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 its rotation; when the operating mechanism is in the open or tripped state, the slide rail and the slider are in a limiting engagement 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, one end of the second crank and 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 its rotation; the rocker arm assembly and the second crank are located at both ends of the operating mechanism in the vertical direction, and the third crank is located on one side of the operating mechanism in the horizontal direction.

[0010] Preferably, the sixth, seventh, eleventh, and twelfth centers are arranged in parallel and spaced apart, and located at the four vertices of a quadrilateral; the second crank is rotatably mounted on the support about the sixth center, and the third crank is rotatably mounted on the support about the seventh center.

[0011] Preferably, the bracket is provided with a second crank guide hole, the second crank and the third connecting rod are rotatably connected through an 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;

[0012] And / or, the bracket is provided with a third crank guide hole, the third connecting rod and the third crank are rotatably connected through the twelfth shaft, the twelfth shaft is inserted in the third crank guide hole, and the shape of the third crank guide hole matches the motion trajectory of the twelfth shaft.

[0013] Preferably, the second crank is a strip plate structure, with one end rotating around the sixth center and the other end rotating around the eleventh center and connected to the third and second connecting rods.

[0014] Preferably, the third crank is a triangular plate structure, with its first vertex rotated around the seventh center, its second vertex rotated around the twelfth center and connected to the third connecting rod, and its third vertex rotated and connected to the moving contact mechanism of the circuit breaker.

[0015] Preferably, the third crank is an obtuse-angled triangular plate structure, with its first vertex being an obtuse angle.

[0016] Preferably, the bracket includes two bracket side plates arranged at relative intervals. Each bracket side plate includes a first side plate part and a second side plate part connected to each other. A rocker arm assembly, a jump fastener, a locking fastener, a re-fastener, and a second crank are rotatably mounted on the first side plate part. V-grooves and slide rails are respectively provided at both ends of the first side plate part in the vertical direction. The second side plate part is connected to one end of the first side plate part in the horizontal direction. The rocker arm assembly is oscillating in the V-groove, and the third crank is rotatably mounted on the second side plate part.

[0017] Preferably, the slide rail has a groove-like structure or a hole-like structure.

[0018] Preferably, the slide rail is mounted on the bracket.

[0019] Preferably, the operating mechanism further includes a first traction rod and a transmission trip buckle that are engaged with each other and rotatably disposed thereon. The transmission trip buckle is driven to rotate when a short circuit and / or overload fault occurs in the circuit where the circuit breaker is located, thereby releasing the engagement with the first traction rod. The first traction rod then rotates to drive the operating mechanism to disengage.

[0020] Preferably, the operating mechanism further includes a thermomagnetic tripping mechanism, which drives the first traction rod to rotate and release the latching engagement with the transmission tripping buckle when the circuit breaker experiences a short circuit or overload fault.

[0021] 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 its latching engagement with the transmission trip buckle.

[0022] Preferably, the operating mechanism further includes a slidably mounted test button. An external force drives the test button to slide, and the test button drives the first traction rod to disengage from the latching engagement with the transmission buckle.

[0023] Preferably, when the operating mechanism re-engages from the tripped state, the rocker arm assembly of the operating mechanism drives the transmission trip latch to reset and re-engage with the first traction rod.

[0024] A circuit breaker includes an operating mechanism and at least one set of breaking units. Each breaking unit includes a contact system and an arc-extinguishing chamber. The contact system includes a moving contact mechanism and a stationary contact used in conjunction. The moving contact mechanism includes a contact support rotatably disposed about a seventh center and a moving contact disposed on the contact support. The contact support is connected to a third crank drive. The rocker arm assembly, the second crank, and the arc-extinguishing chamber are arranged sequentially along the vertical direction of the operating mechanism.

[0025] In the operating mechanism of this invention, the slide rail not only provides guidance for the slider but also serves as a support point, providing support for the first connecting rod and the slider. This allows the operating mechanism to have stable closing, opening, and tripping positions without being connected to the moving contact mechanism of the breaking unit. This makes the operating mechanism an independently operable component, facilitating modular assembly and production, and providing more design space for its distribution within the circuit breaker. Furthermore, in actual production, the operating mechanism does not need to cooperate with the moving contact mechanism of the breaking unit, avoiding wear on the contact system of the breaking unit during testing and reducing R&D and production costs. Additionally, the third crank of the operating mechanism is used to drive the moving contact mechanism of the circuit breaker, allowing the moving contact mechanism and the operating mechanism to be arranged side-by-side in the horizontal direction of the operating mechanism. This provides more space on one side of the operating mechanism in the vertical direction for setting up the arc-extinguishing chamber, enabling the arrangement of a larger, more efficient arc-extinguishing chamber, thereby improving the arc-extinguishing and breaking performance of the circuit breaker.

[0026] In addition, the operating mechanism re-engages and simultaneously drives the transmission trip latch to reset so as to restore the latching engagement with the first traction rod, ensuring the reliable reset of the transmission trip latch and the first traction rod, in order to prepare for the next tripping and opening.

[0027] The circuit breaker of the present invention includes the operating mechanism and has good arc extinguishing performance. Attached Figure Description

[0028] Figure 1 is a schematic diagram of the circuit breaker in the closed state of the present invention, showing the fast tripping device and the test button;

[0029] Figure 2 is a schematic diagram of the segmentation unit structure in the closed state of the present invention;

[0030] Figure 3 is a schematic diagram of the structure of the breaking unit of the present invention. The electric repulsion between the moving contact, the passive contact and the stationary contact drives the first transmission structure to rotate.

[0031] Figure 4a is a schematic diagram of the circuit breaker in the closed state of the present invention, showing the cooperation relationship between the operating mechanism and the moving contact mechanism of the disconnecting unit;

[0032] Figure 4b is a schematic diagram of the operating mechanism of the present invention in the closed state;

[0033] Figure 5a is a schematic projection of the circuit breaker in the tripped state of the present invention;

[0034] Figure 5b is a three-dimensional structural schematic diagram of the circuit breaker in the tripped state of the present invention;

[0035] Figure 5c is a schematic diagram of the operating mechanism in the tripped and open state of the present invention, showing the cooperation relationship between the first traction rod and the thermomagnetic trip unit;

[0036] Figure 6 is a schematic diagram of the circuit breaker structure during the re-clamping process of the present invention;

[0037] Figure 7 is a schematic diagram of the first transmission structure of the present invention;

[0038] Figure 8 is a schematic diagram of the structure of the first-stage push rod of the present invention;

[0039] Figure 9 is a schematic diagram of the structure of the secondary push rod of the present invention;

[0040] Figure 10 is a schematic diagram of the structure of the first traction rod of the present invention;

[0041] Figure 11 is a schematic diagram of the transmission jumper of the present invention;

[0042] Figure 12 is a schematic diagram of the structure of the second traction rod of the present invention.

[0043] Explanation of reference numerals in the attached drawings: First center 1S; Second center 2S; Third center 3S; Fourth center 4S; Fifth center 5S; Sixth center 6S; Seventh center 7S; Eighth center 8S; Ninth center 9S; Tenth center 10S; Eleventh center 11S; Twelfth center 12S; First connecting shaft 1a; Rocker arm drive unit 2a; Buckle structure 3a; Second connecting shaft 1b; Third connecting shaft 1c; Bracket 1; Slide rail 1-0; Second crank guide hole 1-1; Third crank guide hole 1-2; Energy storage spring 4; Handle 2; Rocker arm 3; Reset structure 6; Jump fastener 7; Slider shaft 8; Re-fastener 9; Locking fastener 10; Matching torsion spring 11; Breaking unit housing 12; First crank 14; Crank limiter Part 15; First connecting rod 16; Slider 18; Second connecting rod 19; Second crank 22; Third connecting rod 23; Test button elastic reset component 24; Third crank 25; Drive shaft 28; Transmission jump buckle 32; Transmission jump buckle pivot end 32-0; Transmission jump buckle drive surface 32-1; Transmission jump buckle latch end 32-2; Lap end hook 32-20; Transmission jump buckle driven part 32-3; First traction rod 34; First traction rod body 34-0; First traction rod shaft hole 34-00; First traction rod driven part 34-1; First traction rod latch arm 34-2; Lap arm hook 34-20; First traction rod connecting arm 34-3; First traction rod spring arm 34-4; First traction rod reset elastic component 36; Contact support 40; Moving contact 41; Stationary contact 42; First transmission structure 43; First transmission structure mounting part 43-0; First transmission structure shaft hole 43-00; First transmission structure driven part 43-1; First transmission structure drive arm 43-2; First stage push rod 44; First stage push rod arm 44-0; First stage push rod shaft 44-1; First stage push rod shaft connecting part 44-10; Second stage push rod 45; Second stage push rod arm 45-0; Second stage push rod arm connecting hole 45-00; Second stage push rod shaft 45-1; Test button 46; Contact spring 47; First end of contact spring 47-0; Contact spring body 47-1; Second end of contact spring 47-2; First mounting shaft 48-0; Second mounting shaft 4 8-1; Second traction rod 49; Second traction rod body 49-0; Second traction rod connecting arm 49-1; Second traction rod armature mating arm 49-2; Second traction rod bimetallic mating arm 49-3; Armature transmission component 50; Bimetallic element 51; First hinge shaft 52-1; Second hinge shaft 52-2; Thermomagnetic release armature 53; Thermomagnetic release 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 jump buckle elastic component 60; Transmission jump buckle shaft 61; Torsion spring limiting shaft 62; Rocker arm rotating shaft 85; Crank jump buckle hinge shaft 86; Four-bar linkage structure 97; Eleventh shaft 2223; Twelfth shaft 2325. Detailed Implementation

[0044] The specific embodiments of the circuit breaker of the present invention are further described below with reference to the examples given in Figures 1-12. The circuit breaker of the present invention is not limited to the descriptions of the following embodiments.

[0045] 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.

[0046] As shown in Figures 1-6, the circuit breaker of the present invention includes an operating mechanism and at least one set of breaking units. The operating mechanism is driven to connect with the breaking units to drive them to close or open, thereby closing or opening the circuit breaker. Further, the breaking unit includes a contact system, which includes a cooperating moving contact mechanism and a stationary contact. The moving contact mechanism includes a rotatably mounted contact support 40 and a moving contact 41 mounted on the contact support 40.

[0047] The circuit breaker of the present invention preferably includes multiple breaking units, wherein the moving contact mechanisms of each breaking unit are arranged side by side, rotate coaxially, and are all driven and connected to the operating mechanism so as to be closed or opened synchronously.

[0048] Figures 1 and 4a-6 show one embodiment of the operating mechanism.

[0049] The operating mechanism has three working states: open state, closed state, and tripped state (tripped open state). When the operating mechanism is in the tripped state, it can switch back to the open state by re-tripping.

[0050] As shown in Figures 1 and 4a-6, the operating mechanism includes a bracket 1, a rocker arm assembly, a jump fastener 7, a locking fastener 10, and a re-fastener 9 rotatably mounted on the bracket 1, a first crank 14, an energy storage spring 4, a slide rail 1-0 fixed relative to the bracket 1, a slider 18, a first connecting rod 16, and a second crank 22 rotatably mounted around a sixth center 6S. The locking fastener 10 engages with the jump fastener 7 and is limited by the re-fastener 9. One end of the first crank 14 is rotatably mounted on the jump fastener 7 around an eighth center 8S, and the other end is rotatably connected to one end of the first connecting rod 16 and one end of the energy storage spring 4 around a tenth center 10S. The other end of the energy storage spring 4 is connected to the rocker arm assembly, and the other end of the first connecting rod 16 is rotatably connected to the slider 18. The slider 18 is slidably mounted on the slide rail 1-0. When the operating mechanism is in the open or tripped state, the slide rail 1-0 and the slider 18 are limited to prevent the slider 18 from sliding. The slider 18 converts the positional changes of the opening and closing motion of the first connecting rod 16 into the displacement of the slider 18, which facilitates actual measurement and adjustment of parameters such as the structural dimensions connected to the slider 18. Moreover, at this time, the mechanism linkage conversion and torque transmission can be realized 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 to the rotating shaft (i.e., the moving contact mechanism), which facilitates the modular production of the operating mechanism. In other words, in the operating mechanism, the slide rail 1-0 not only provides guidance for the slider 18, but also serves as a support point, providing support for the first connecting rod 16 and the slider 18. This allows the operating mechanism to have stable closing, opening, and tripping positions without being connected to the moving contact mechanism of the disconnecting unit. This makes the operating mechanism an independently operable component, which is beneficial for modular assembly and production of the operating mechanism. It also allows for more design space for the distribution of the operating mechanism within the circuit breaker. Furthermore, in actual production, the operating mechanism does not need to cooperate with the moving contact mechanism of the disconnecting unit, avoiding damage to the contact system of the disconnecting unit during testing and reducing R&D and production costs.

[0051] Furthermore, in this embodiment, the jump fastener 7 is rotatably mounted on the bracket 1 around the first center 1S, the locking fastener 10 is rotatably mounted on the bracket 1 around the second center 2S, the re-fastener 9 is rotatably mounted on the bracket 1 around the third center 3S, and the rocker arm assembly is rotatably mounted on the bracket 1 around the fourth center 4S.

[0052] As shown in Figures 1, 4a-5c, the jump fastener 7 is rotatably mounted on the bracket 1 via the jump fastener shaft, the locking fastener 10 is rotatably mounted on the bracket 1 via the locking fastener shaft, and the re-fastener 9 is rotatably mounted on the bracket 1 via the re-fastener shaft.

[0053] As shown in Figures 1 and 4a-6, the slide rail 1-0 is preferably provided in a long straight hole on the bracket 1, and the slider 18 reciprocates in the long straight hole along its extension direction. Further, one end of the long straight hole is open, and the other end is closed, serving as the open position for the slider 18. It should be noted that the slide rail 1-0 may not be provided on the bracket 1, but rather on a support structure independent of the operating mechanism, such as a housing structure for accommodating the operating mechanism or the housing of the breaking unit (the housing of the breaking unit is called the breaking unit housing 12, as shown in Figure 2).

[0054] As shown in Figures 1 and 4a-6, the rocker arm assembly includes a handle 2 and a rocker arm 3 that move synchronously, and a reset structure 6 for driving the jump fastener 7 and the locking fastener 10 to re-engage. The rocker arm 3 is rotatably mounted on the support 1 around the fourth center 4S (as shown in Figure 5c, the rocker arm 3 is preferably rotatably mounted on the support 1 via a rocker arm pivot 85). The rocker arm 3 is respectively limited to the support 1 at both ends of its swing stroke. Further, the reset structure 6 is a reset shaft mounted 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). The jump fastener 7 is a strip-shaped structure, with one end engaging with the locking fastener 10 and the other end rotatably mounted on the support 1. When the operating mechanism is in the disengaged state, the rocker arm assembly swings in the opening direction to drive the jump fastener 7 to rotate and re-engage with the locking fastener 10 via the reset structure 6 (that is, the two re-engage), and the locking fastener 10 and the re-engagement fastener 9 return to their limited engagement.

[0055] As shown in Figures 1 and 4a-6, the bracket 1 is provided with a V-shaped groove, and the rocker arm 3 is respectively limited to the two side walls of the V-shaped groove at both ends of its swing stroke.

[0056] As shown in Figures 1, 4b, and 5a, the first crank 14 has a triangular structure. Its first vertex is rotatably mounted on the jump fastener 7 around the eighth center 8S (the first vertex is preferably rotatably connected to the jump fastener 7 via the crank jump fastener hinge shaft 86). The second vertex is rotatably connected around the tenth center 10S to one end of the first connecting rod 16 and one end of the energy storage spring 4, respectively. The third vertex is provided with a crank limiting part 15. Furthermore, the operating mechanism includes two first cranks 14 symmetrically arranged on both sides of the jump fastener 7 and fixedly connected, and the two first cranks 14 operate synchronously.

[0057] As shown in Figures 1 and 4b, the operating mechanism also includes a torsion spring 11, which cooperates with the fastener 9 and the locking fastener 10 respectively, so that the two maintain a limiting fit.

[0058] As shown in Figures 1 and 4a-6, the operating mechanism further includes a second connecting rod 19, a second crank 22 rotatably arranged around a sixth center 6S, a third connecting rod 23, and a third crank 25 rotatably arranged around a seventh center 7S. One end of the second connecting rod 19 is rotatably connected to the slider 18, and the other end is rotatably connected to the second crank 22 around an eleventh center 11S to drive its rotation. One end of the second crank 22 and the third connecting rod 23 are also rotatably connected around an eleventh center 11S, and the other end of the third connecting rod 23 is rotatably connected to the third crank 25 around a twelfth center 12S to drive its rotation. The third crank 25 is used to drive the moving contact mechanism of the breaking unit. The rocker arm assembly and the second crank 22 are 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 driven to the moving contact mechanism through a drive shaft 28. Preferably, the housing of the breaking unit is provided with a drive shaft clearance hole that matches the movement trajectory of the drive shaft 28. The operating mechanism has a third crank 25 for driving connection with 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 up the arc-extinguishing chamber on one side of the vertical direction of the operating mechanism, so as to arrange a larger arc-extinguishing chamber with better arc-extinguishing performance, thereby improving the arc-extinguishing performance and breaking performance of the circuit breaker.

[0059] The circuit breaker of this invention improves upon the existing four- or five-bar linkage switching structure by arranging the rotation centers of the operating mechanism and the moving contact mechanism on the same horizontal line (i.e., the operating mechanism and the moving contact mechanism are arranged side by side along the horizontal direction of the operating mechanism). While 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-bar linkage structure (as shown in Figures 4a and 6, the four-bar linkage structure 97 is composed of a second crank 22, a third connecting rod 23, and a third crank 25) are added. This not only realizes the opening and closing actions of the operating mechanism and the moving contact mechanism of 2P and 3P circuit breakers, but also reserves more design space for the arc-extinguishing chamber, ultimately enabling a horizontal arc-extinguishing chamber design for the circuit breaker.

[0060] As shown in Figures 1, 4a-5a, and 6, the sixth center 6S, the seventh center 7S, the eleventh center 11S, and the twelfth center 12S are arranged in parallel at intervals and located at the four vertices of a quadrilateral.

[0061] As shown in Figures 1, 4b-5a, the second crank 22 is preferably rotatably mounted on the support 1 about the sixth center 6S. Further, the second crank 22 is a long strip plate structure, with one end rotatably mounted on the support 1 about the sixth center 6S, and the other end rotatably connected to the third connecting rod 23 about the eleventh center 11S. It should be noted that the second crank 22 may also not be mounted on the support 1, but rather on a housing structure independent of the operating mechanism, such as a housing structure for accommodating the operating mechanism 1 or the housing of the disassembly unit.

[0062] As shown in Figure 5b, 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 an eleventh shaft 2223. The eleventh shaft 2223 is inserted into the second crank guide hole 1-1. The shape of the second crank guide hole 1-1 matches the movement trajectory of the eleventh shaft 2223. The second crank guide hole 1-1 is an arc-shaped hole.

[0063] As shown in Figures 1, 4b-5a, the third crank 25 is preferably rotatably mounted on the support 1 about the seventh center 7S. It should be noted that the third crank 25 may also not be mounted on the support 1, but rather mounted on a housing structure independent of the operating mechanism, such as a housing structure for accommodating the operating mechanism 1 or the housing of the disassembly unit.

[0064] As shown in Figures 1, 4b-5a, the third crank 25 is a triangular plate structure. Its first vertex is rotatably mounted on the support 1 around the seventh center 7S, its second vertex is rotatably connected to the third connecting rod 23 around the twelfth center 12S, and its third vertex is rotatably connected to the moving contact mechanism of the breaking unit to drive the moving contact mechanism to rotate. Furthermore, the third crank 25 is an obtuse-angled triangular plate structure, with its first vertex being an obtuse angle.

[0065] As shown in Figures 1 and 4a-4b, the bracket 1 preferably has a third crank guide hole 1-2. The third connecting rod 23 and the third crank 25 are preferably rotatably connected through the 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 movement trajectory of the twelfth shaft 2325. The third crank guide hole 1-2 is an arc-shaped hole.

[0066] The following, in conjunction with Figures 1, 4a-5a, and 6, describes the switching process of the operating mechanism between the open, closed, and tripped states:

[0067] As shown in Figures 1, 4a-5a, and 6, the two ends of the swing stroke of the rocker arm 3 in the rocker arm assembly are the first end of the stroke and the second end of the stroke, respectively. 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, which are 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, respectively. Specifically, as shown in Figures 1, 4a-5a, and 6, the first end of the stroke and the second end of the stroke of the rocker arm 3 are the right end and the left end of the swing stroke of the rocker arm 3, respectively. 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.

[0068] Referring to Figures 1 and 4a-4b, the operation process of the operating mechanism switching from the closed state to the open state is as follows:

[0069] As shown in Figures 1 and 4a-4b, when the operating mechanism is in the closed state, the rocker arm 3 swings to the second end of its 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. The energy storage is at its maximum when the energy storage spring 4 reaches the first dead point position. After the energy storage spring 4 rotates past the first dead point position, the energy storage spring 4 releases energy and drives the first crank 14 to rotate in the second direction and drives the rocker arm 3 to swing to the second end of its stroke. The first crank 14 drives the slider 18 to slide along the slide rail 1-0 from the closed position to the open position through the first connecting rod 16. The slider 18 is limited to the slide rail 1-0 at the closed 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 breaking direction to break with the corresponding stationary contact 42. Specifically, referring to Figures 1 and 4a-4b, when the operating mechanism switches from the closed position to the open position, the slider 18 moves upward along the slide rail 1-0 until the slider 18 moves to the upper end of the slide rail 1-0 (that is, the closed position of the slider 18) and engages with its limit to prevent the slider 18 from sliding further. The second direction is counterclockwise. The axis of the energy storage spring 4 is the first axis. When the energy storage spring 4 is in the first dead point position, the energy storage of the energy storage spring 4 reaches its maximum value. The eighth center 8S is located on the first axis. At the same time that the energy storage spring 4 rotates around the second end of the energy storage spring through the first dead point position, the first axis rotates through the eighth center 8S. Therefore, the eighth center 8S can also be regarded as the first dead point position. That is to say, the first axis of the energy storage spring 4 rotating through the eighth center 8S is also the energy storage spring 4 rotating through the first dead point position.

[0070] The operation process of the operating mechanism switching from the open state to the closed state is as follows:

[0071] When the operating mechanism 100 is in the open position, the rocker arm 3 swings to the first end of its stroke and drives the first end of the energy storage spring 4 to rotate around the second end of the energy storage spring. When the energy storage spring 4 passes 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 limiting part 15 is engaged with the jump fastener 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 its stroke, and the first crank 14 drives the slider 18 to slide along the slide rail 1-0 from the closed position to the open 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 stationary 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 1-0 to the closed position; the first direction is clockwise.

[0072] As shown in Figures 1 and 4a-5a, the process of the operating mechanism switching from the closed state to the tripped state (i.e., the tripped opening state) is as follows:

[0073] As shown in Figures 1 and 4a-4b, when the operating mechanism is in the closed state, an external force (such as the force exerted by the transmission jump buckle 32 on the re-fastener 9 as described below) drives the re-fastener 9 to rotate and release its limiting engagement with the locking buckle 10. The locking buckle 10 rotates and releases its locking engagement with the jump buckle 7. Under the action of the energy storage spring 4, the rocker arm of the rocker arm assembly swings to the second end of its stroke, and the jump buckle 7 rotates in the second direction, driving the first crank 14 to rotate synchronously until the jump buckle 7 engages with the reset structure 6 of the rocker arm assembly. The first crank 14 then... The first connecting rod 16 drives the slider 18 to slide along the slide rail 1-0 from the closed position to the open position. During this process, the eighth center 8S remains 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 breaking direction to break with the corresponding stationary contact 42. The operating mechanism switches to the tripping state shown in Figure 5a, which is the tripping open state. Specifically, when the operating mechanism switches from the closed state to the tripping state, the slider 18 moves upward along the slide rail 1-0 from the closed position to the open tripping position.

[0074] As shown in Figures 5a-6, the specific process of the operating mechanism switching from the tripped state to the open state is as follows:

[0075] As shown in Figures 5a-5c, when the operating mechanism is in the disengaged state, as shown in Figure 6, an external force drives the rocker arm 3 to swing towards the second end of its stroke, releasing the external force applied to the re-fastener 9 to release its limiting engagement with the locking fastener 10 (e.g., the force applied to the re-fastener 9 by the transmission jump buckle 32 described below). This, combined with the torsion spring 11, drives the locking fastener 10 and the re-fastener 9 to reset so that they regain their limiting engagement. Simultaneously, the rocker arm 3 drives the jump buckle 7 to rotate in the first direction via the reset structure 6 until it re-engages with the locking fastener 10. The jump buckle 7 is driven by the first crank 14 and the first connecting rod 16. The movable slider 18 rotates from the open position to the closed position on the slide rail 1-0, but does not reach the closed position. Then it quickly moves back to the open position. At the same time, the slider 18 drives the second crank 22 through the second connecting rod 19. 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 to rotate from the open position of the moving contact mechanism to the closed direction, but does not close with the stationary contact 42. Then it rotates to the open position in the disconnection direction. After removing the external force that drives the rocker arm 3 to swing, the operating mechanism switches to the open state. Specifically, when the operating mechanism re-engages from the disengaged state, external force drives the rocker arm 3 to rotate clockwise. The reset structure 6 of the rocker arm assembly drives the jump fastener 7 to rotate clockwise around the first center 1S. The jump fastener 7 drives the slider 18 to move slightly downward along the slide rail 1-0 via the first crank 14 and the first connecting rod 16, but it 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, causing the axis of the energy storage spring 4 to rotate through the eighth center 8S. The energy storage spring 4 then drives the first crank 14 to rotate counterclockwise around the eighth center 8S. When the first crank 14 rotates, it drives the slider 18 to slide upward along the slide rail 1-0 to the open position via the first connecting rod 15. At the same time, the slider 18 drives the second crank 22 via the second connecting rod 19. The second crank 22 drives the third crank 25 via the third connecting rod 23 to rotate clockwise by a small angle and then counterclockwise to return to its original position. The third crank 25 drives the moving contact mechanism to rotate slightly from the open position to the closed position. The moving contact mechanism will not close with the stationary contact 42. Then, the moving contact mechanism rotates back to the open position under the drive of the third crank 25.

[0076] In theory, after the operating mechanism is disengaged 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 guide rail 1-0, all of which occur simultaneously. However, due to actual machining errors, it is difficult for the above three processes to be carried out at the same time. In this embodiment, ensuring that the eleventh shaft 2223 is limited before the other two is beneficial to increasing the torque of the contact spring 4 in overcoming the friction of the rotating shaft (that is, the contact support of the moving contact mechanism) when the circuit is closed.

[0077] As shown in Figure 4b, the bracket 1 includes two bracket side plates arranged at relative intervals. Each bracket side plate includes a first side plate part and a second side plate part connected to each other. A rocker arm assembly, a jump fastener 7, a locking fastener 10, a re-fastener 9, and a second crank 22 are rotatably mounted on the first side plate part. V-shaped grooves and slide rails 1-0 are respectively provided at both ends of the first side plate part in the vertical direction. The second side plate part is connected to one end of the first side plate part in the horizontal direction. The rocker arm assembly is oscillating in the V-shaped groove, and the third crank 25 is rotatably mounted on the second side plate part. Further, as shown in Figure 4b, the up-down direction of Figure 4b is the vertical direction of the first side plate part, and the left-right direction of Figure 4b is the horizontal direction of the first side plate part.

[0078] As shown in Figures 4b-5c, the bracket 1 preferably includes a bracket connecting plate, and the two ends of the bracket connecting plate are respectively bent and connected to two bracket side plates, so that the bracket 1 as a whole forms a U-shaped structure.

[0079] Referring to Figures 1 and 4a-6, in the operating mechanism, two guide rails 1-0 are respectively mounted on two support side plates. The two ends of sliders 18 are slidably mounted within the two guide rails 1-0. The two sliders 18 are preferably connected by slider shafts 8. Two second cranks 22, two second connecting rods 19, two third connecting rods 23, and two third cranks 25 are symmetrically arranged on both sides of the two support side plates. The rocker arm 3 includes two rocker arm support legs arranged opposite each other, each set within a V-shaped groove. The symmetrical arrangement and parallel connection of the first connecting rod 16 and the second connecting rod 19 effectively reduces the positional error generated during the transmission of the left and right connecting rods, and also reduces the number of parts. This ensures the reliability of the multi-link movement and the consistency of the left and right pole actions, significantly impacting the overall performance of the circuit breaker.

[0080] As shown in Figures 4a, 5a-5b, and 6, the operating mechanism is connected to each segmentation unit via three parallel connecting shafts, namely the first connecting shaft 1a, the second connecting shaft 1b, and the third connecting shaft 1c. Furthermore, the operating mechanism spans across a segmentation unit, with the two support side plates of the bracket 1 located on either side of the segmentation unit. One vertical end of the operating mechanism is connected to the housing of the segmentation unit via the three connecting shafts, which are spaced apart along the horizontal direction of the operating mechanism.

[0081] As shown in Figures 1-3 and 7-11, the circuit breaker of the present invention also includes a fast tripping device. This device is used to quickly trip the circuit breaker when a short-circuit fault occurs in the circuit containing the circuit breaker, thus achieving short-circuit protection. Specifically, when a short-circuit fault occurs in the circuit containing the circuit breaker, the moving contact 41 of the tripping unit is repelled by an electric repulsive force and rotates relative to the contact support 40. The moving contact 41 drives the re-fastening member 9 of the operating mechanism to rotate via a transmission path. The re-fastening member 9 releases its limiting engagement with the locking member 10, and the locking member 10 rotates to release its latching engagement with the tripping member 7, thereby causing the operating mechanism to trip. Furthermore, a driving gap is provided in the transmission path from the moving contact 41 to the operating mechanism. The driving gap allows the moving contact 41 to rotate through a preset angle before the operating mechanism is driven to trip, thus preventing the operating mechanism from tripping when the moving contact 41 bounces due to hard contact between the moving contact 41 and the stationary contact 42 during normal closing of the circuit breaker.

[0082] As shown in Figures 1-3, the fast tripping device includes an operating mechanism and a contact system (i.e., the contact system of the disconnecting unit). The moving contact mechanism of the contact system includes a contact support 40 rotatably arranged around the seventh center 7S, a moving contact 41 rotatably arranged on the contact support 40 relative to it, a contact spring 47 connected at both ends to the contact support 40 and the moving contact 41 respectively, a first transmission structure 43 arranged on the contact support 40 and drivingly cooperating with the moving contact 41, and a first traction rod 34 and a transmission trip buckle 32 with a snap-fit ​​engagement. When the contact system carries a short-circuit current, that is, when a short-circuit fault occurs in the circuit where the circuit breaker is located, the moving contact 41 rotates relative to the contact support 40 due to the electric repulsion between the moving contact 41 and the stationary contact 42. The moving contact 41 drives the first traction rod 34 to move through the first transmission structure 43 to release the snap-fit ​​engagement with the transmission trip buckle 32. The transmission trip buckle 32 moves to drive the operating mechanism to trip, and the operating mechanism switches to the tripped state. Furthermore, after the transmission buckle 32 releases its latching engagement with the first traction rod 34, the re-fastener 9 of the driving operating mechanism rotates to release its limiting engagement with the locking fastener 10.

[0083] As shown in Figure 2-3, the moving contact 41 is rotatably mounted on the contact support 40 around a seventh center 7S. When the moving contact 41 and the stationary contact 42 are normally closed or open, the contact spring 47 is in the first position, and the first 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, causing the moving contact 41 to rotate relative to the contact support 40 to the repulsion position, the moving contact 41 drives the contact spring 47 to swing to the second position, where the first center 7S is located on the other side of the contact spring 47. The contact spring 47 applies a force to the moving contact 41 to keep it in the repulsion position, preventing the moving contact 41 from closing with the stationary contact 42 again. Furthermore, the repulsion position of the moving contact 41 is the same as the open position.

[0084] When the contact spring 47 is pushed away, the contact spring 47 swings from the first position, through the dead point position, to the second position. When the contact spring 47 is in the dead point position, the axis of the contact spring 47 coincides with the seventh center 7S, that is to say, the seventh center 7S is located on the axis of the contact spring 47.

[0085] As shown in Figures 1-3, the moving contact mechanism, the transmission jump buckle 32, and the first traction rod 34 are located on one side of the horizontal direction of the operating mechanism, and the rocker arm assembly of the operating mechanism is set at one end of the vertical direction of the operating mechanism. The rotation axes of the rocker arm assembly, the moving contact mechanism, the transmission jump buckle 32, and the first traction rod 34 are parallel to each other.

[0086] Referring to Figures 5b and 6, when the operating mechanism re-engages from the tripped open state (the operating mechanism switches to the open state after re-engaging from the tripped open state), the rocker arm assembly drives the transmission trip latch 32 to reset and re-engage with the first traction rod 34. The locking member 10 and the re-engaging member 9 are reset under the action of the torsion spring 11 and restore their limiting engagement. The trip latch 7 also rotates under the drive of the rocker arm assembly's reset structure 6 to re-engage with the locking member 10, thus re-engaging the operating mechanism. After re-engaging, the operating mechanism enters the open state. Further, the rocker arm assembly 3 includes a rocker arm drive part 2a, and the transmission trip latch 32 includes a transmission trip latch driven part 32-3. The rocker arm drive part 2a and the transmission trip latch driven part 32-3 are in a transmission engagement to drive the transmission trip latch 32 to reset. Furthermore, as shown in Figure 11, the driven part 32-3 of the transmission jump buckle is a boss protruding from one side of the transmission jump buckle 32, as shown in Figures 5b and 6, and the rocker arm drive part 2a is a push plate that is in transmission cooperation with the boss.

[0087] As shown in Figures 1-3, the fast tripping device also includes a tripping device housing and a second transmission structure. The tripping device housing is formed by the housing of the disconnecting unit. The operating mechanism, the first traction rod 34, and the transmission trip buckle 32 are all located outside the tripping device housing. The contact system and the first transmission structure 43 are both located 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 engages with the first transmission structure 43, while the other end is located outside the tripping device housing (the housing of the disconnecting unit) and engages with the first traction rod 34. This structural design achieves the isolation between the operating mechanism and the conductive structure (contact system) of the circuit breaker, which is beneficial to improving safety and ensuring the electrical safety of the operator.

[0088] As shown in Figures 1-3 and 8-9, the second transmission structure includes a primary push rod 44 and a secondary push rod 45 coaxially and synchronously rotating. The primary push rod 44 includes a primary push rod arm 44-0 and a primary push rod shaft 44-1. The secondary push rod 45 includes a secondary push rod arm 45-0 and a secondary push rod shaft 45-1 disposed on the secondary push rod arm 45-0. The primary push rod arm 44-0 is located inside the trip device housing (the housing of the disconnecting unit), and the secondary push rod 45 is located outside the trip device housing (the housing of the disconnecting unit). The push rod 44-0 is in transmission cooperation with the first transmission structure 43 and is fixedly connected to one end of the primary push rod 44-1. The primary push rod shaft 44-1 is rotatably inserted into the trip device housing (the housing of the disconnecting unit), and the other end of the primary push rod shaft 44-1 passes through the trip device housing (the housing of the disconnecting unit) and is connected to the secondary push rod arm 45-0. The secondary push rod arm 45-0 is in transmission cooperation with the first traction rod 34 through the secondary push rod shaft 45-1. Furthermore, one end of the primary push rod arm 44-0 is connected to 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. Furthermore, the secondary push rod arm 45-0 is provided with a secondary push rod arm connecting hole 45-00, which is a polygonal hole. One end of the primary push rod shaft 44-1 is provided with a primary push rod shaft connecting part 44-10, which is a polygonal column. The polygonal hole and the polygonal column are shaped and interlocked.

[0089] The drive clearance is preferably set between the first transmission structure 43 and the first-stage push rod arm 44-0.

[0090] The drive clearance is preferably set between the secondary push rod shaft 45-1 and the first traction rod 34.

[0091] As shown in Figures 1-3, the first transmission structure 43 is rotatably mounted on the contact support 40.

[0092] As shown in Figures 2-3, the first transmission structure 43 and the moving contact 41 can achieve transmission cooperation using existing technology. For example, as shown in Figures 1-3, the first transmission structure 43 is driven to cooperate 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. Further, as shown in Figure 7, the first transmission structure 43 includes a first transmission structure mounting part 43-0 and a first transmission structure driven part 43-1. The first transmission structure mounting part 43-0 preferably has 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 first contact spring end 47-0 and a second contact spring end 47-1 respectively connected to both ends of the contact spring body 47-1. The second end 47-2 of the contact spring comprises a first end mounting portion and a first end connecting portion, with both ends of the first end connecting portion connected to the first end mounting portion and the contact spring body 47-1, respectively. The first transmission structure mounting portion 43-0 is rotatably mounted on the contact support 40 via a first mounting shaft 48-0. The first end mounting portion is rotatably mounted on the first mounting shaft 48-0. The driven portion 43-1 of the first transmission structure is mounted on the first end connecting portion. The second end 47-2 of the contact spring is connected to the moving contact 41 via a second mounting shaft 48-1. Furthermore, the driven portion 43-1 of the first transmission structure has a first transmission structure connecting hole, through which it is sleeved onto the first end connecting portion.

[0093] Alternatively, when the moving contact 41 is repelled, it rotates and presses against the first transmission structure 43, causing it to rotate. Furthermore, the moving contact 41 is provided with a moving contact boss, and the first transmission structure 43 is provided with a first transmission structure driven arm; the moving contact boss and the first transmission structure driven arm are in a transmission engagement. Furthermore, the driving gap is preferably located between the first transmission structure 43 and the moving contact 41.

[0094] In 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 triggers the first traction rod 34 to disengage from the transmission buckle 32.

[0095] As shown in Figure 7, the first transmission structure 43 also includes a first transmission structure drive arm 43-2 connected to the first transmission structure mounting part 43-0, and the first transmission structure drive arm 43-2 is in transmission cooperation with the first stage push rod arm 44-0 of the first stage push rod 44.

[0096] As shown in Figures 1-3 and 5b, the first traction rod 34 is rotatably mounted around the fifth center 5S, and the first traction rod 34 is preferably rotatably mounted on the trip device housing (the housing of the disconnecting unit) via the first traction rod shaft 58.

[0097] As shown in Figures 1-3 and 5b, the transmission buckle 32 is rotatably mounted around the ninth center 9S, and the transmission buckle 32 is preferably rotatably mounted on the bracket 1 via the transmission buckle shaft 61.

[0098] In another embodiment, the transmission trip buckle 32 is rotatably mounted on the trip device housing (the housing of the disconnecting unit) around the ninth center 9S.

[0099] As shown in Figures 1, 4a, 5b-6, when the first traction rod 34 and the transmission buckle 32 are engaged, they tend to rotate in opposite directions, causing the parts of the first traction rod 34 and the transmission buckle 32 that engage with each other to tend to move closer to each other (the first traction rod buckle arm 34-2 and the transmission buckle buckle end 32-2 tend to move closer to each other), making the engagement of the two more reliable.

[0100] As shown in Figures 1, 4a, and 5a-6, the fast tripping device further includes a first traction rod reset elastic element 36. The first traction rod reset elastic element 36 applies a force to the first traction rod 34, causing the first traction rod 34 to maintain a latching engagement with the transmission trip buckle 32. Further, as shown in Figure 10, the first traction rod 34 includes a first traction rod body 34-0 and a first traction rod spring arm 34-4 disposed on the first traction rod body 34-0. The first traction rod 34 is rotatably disposed around a fifth center 5S via the first traction rod body 34-0 (preferably rotatably disposed on the tripping device housing). The first traction rod reset elastic element 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 disposed (preferably fixed to the tripping device housing).

[0101] In another embodiment, the first traction rod reset elastic element 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 mounted on the trip device housing.

[0102] As shown in Figures 1 and 5c, the fast tripping device further includes a transmission trip spring 60, which applies a force to the transmission trip spring 32 to disengage its operating mechanism. Further, the transmission trip spring 60 is a torsion spring, which is sleeved on the transmission trip spring shaft 61, with one end engaging with the transmission trip spring 32 and the other end fixedly mounted (preferably fixedly mounted on the tripping device housing). Further, the fast tripping device also includes a torsion spring limiting shaft 62 spaced parallel to the transmission trip spring shaft 61, with the fixed end of the torsion spring engaging with the torsion spring limiting shaft 62.

[0103] As shown in Figures 1-3 and 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 disposed on the first traction rod body 34-0. The first traction rod 34 is rotatably disposed through 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 buckle 32. Furthermore, the first traction rod driven arm 34-1 is in transmission cooperation with the second-stage push rod shaft 45-1 of the second-stage push rod 45. When the second-stage push rod 45 rotates around the first-stage push rod shaft 44-1, the second-stage push rod shaft 45-1 presses against the traction rod driven arm 34-1, causing the first traction rod 34 to rotate. The first traction rod body 34-0 has a cylindrical structure, with a first traction rod shaft hole 34-00 in its middle. 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. The first traction rod shaft 58 is set on the trip device housing (the housing of the disconnection unit).

[0104] As shown in Figures 1, 4a, 5a-6, and 11, the transmission buckle 32 includes a transmission buckle pivot end 32-0 and a transmission buckle latch end 32-2 respectively disposed at its two ends. The transmission buckle 32 is rotatably disposed around the ninth center 9S via the transmission buckle pivot end 32-0 and latches with the first traction rod 34 via the transmission buckle latch end 32-2. Furthermore, the transmission buckle pivot end 32-2 is provided with a transmission buckle shaft hole 32-00, and the transmission buckle pivot end 32-2 is sleeved on the transmission buckle shaft 61 through the transmission buckle shaft hole 32-00.

[0105] As shown in Figures 1, 4a, 5a-6, 10, and 11, the first traction rod 34 has a first traction rod hook arm 34-2 with a hook arm hook 34-20, and a transmission jump hook end 32-2 with a hook end hook 32-20. The hook arm hook 34-20 and the hook end hook 32-20 engage to form a hook structure 3a. Furthermore, both the hook arm hook 34-20 and the hook end hook 32-20 are semi-arrowhead type hooks, and when they engage, they tend to move in opposite directions.

[0106] As shown in Figures 1, 4a, 5a-6, and 11, the transmission jump buckle 32 has a C-shaped structure. The opening of the C-shaped structure faces the seventh center 7S (the rotation center of the moving contact mechanism and the third crank 25). The back of the C-shaped structure is provided with a transmission jump buckle driving surface 32-1 that engages with the re-fastener 9 of the operating mechanism. After the transmission jump buckle 32 contacts and engages with the first traction rod 34, the transmission jump buckle 32 rotates, driving the re-fastener 9 to rotate through the transmission jump buckle driving surface 32-1, thus releasing it from the limiting engagement with the locking member 10, and ultimately disengaging the operating mechanism. The C-shaped design of the transmission jump buckle 32 cleverly avoids the third crank 25 used to connect the moving contact mechanism, making full use of the internal space of the circuit breaker.

[0107] As shown in Figures 1, 4a, 5a, and 6, the line connecting the two ends of the transmission jump buckle 32 is the 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. Furthermore, the angle between the two ends of the transmission jump buckle 32 and the line connecting the seventh center 7S is an obtuse angle.

[0108] As shown in Figures 1 and 5c, the circuit breaker of the present invention further includes a test button 46 slidably disposed on the trip device housing (the housing of the disconnecting unit). When the test button 46 is pressed by external force, it slides, driving the first traction rod 34 to rotate and disengage from the latching engagement with the transmission trip latch 32. The test button 46 achieves a passive operation that causes the operating mechanism to trip and open. Further, the test button 46 is in transmission engagement with the first traction rod driven arm 34-1 of the first traction rod 34. Preferably, one end of the test button 46 is opposite to the free end of the first traction rod driven arm 34-1. When the test button 46 is pressed to slide, it presses against the first traction rod driven arm 34-1, causing the first traction rod 34 to rotate. 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 driven arm 34-1 to prevent accidental activation of the test button 46 and triggering of the operating mechanism tripping.

[0109] The circuit breaker of the present invention also includes 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 driven arm 34-1. The test button elastic reset member 24 is preferably a linear spring, which is sleeved on the test button 46, with one end cooperating with the test button 46 and the other end cooperating with the trip device housing (the housing of the disconnecting unit).

[0110] As shown in Figure 5c, the circuit breaker of the present invention also includes a thermal-magnetic trip mechanism. When a short circuit or overload fault occurs in the circuit where the circuit breaker is located, the thermal-magnetic trip mechanism drives the operating mechanism to trip, thereby realizing the short circuit or overload protection function. Furthermore, in the circuit breaker of the present invention, each breaking unit cooperates with a set of thermal-magnetic trip mechanisms; or, when the circuit breaker of the present invention is of type nP+N, n≥1, each P-pole breaking unit cooperates with a set of thermal-magnetic trip mechanisms, while the N-pole breaking unit does not have a corresponding thermal-magnetic trip mechanism. Furthermore, the thermal-magnetic trip mechanism is disposed within the housing of the corresponding breaking unit.

[0111] In this embodiment, as shown in Figure 5c, the thermomagnetic tripping mechanism includes a rotatably mounted second traction rod 49, which is driven and 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 thermomagnetic tripping mechanism drives the first traction rod 34 to move through the second traction rod 49, thereby releasing the latching engagement with the transmission trip buckle 32. The transmission trip buckle 32 then 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 thermomagnetic 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, thereby releasing the latching engagement with the transmission trip buckle 32.

[0112] As shown in Figure 5c, the operating mechanism, transmission buckle 32, first traction rod 34 and thermomagnetic release mechanism are arranged sequentially along the horizontal direction of the operating mechanism.

[0113] As shown in Figure 5c, the rotation axes of the second traction rod 49, the transmission jump buckle 32, and the first traction rod 34 are parallel to each other.

[0114] As shown in Figures 5c and 10, the first traction rod 34 further includes a first traction rod connecting arm 34-3 disposed on the first traction rod body 34-0, and the second traction rod 49 includes a second traction rod body 49 and a second traction rod connecting arm 49-1 disposed on the second traction rod body 49. The second traction rod connecting arm 49-1 is drivenly connected to the first traction rod 34-3 through a connecting rod 55. Further, the two ends of the connecting rod 55 are hinged to the second traction rod connecting arm 49-1 and the first traction rod connecting arm 34-3 respectively through a first hinge shaft 55-0 and a second hinge shaft 55-1.

[0115] Figure 10 shows an embodiment of the first traction rod 34: 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 latch arm 34-2, and a first traction rod connecting arm 34-3 respectively disposed on the first traction rod body 34-0. The first traction rod 34-0 has a cylindrical structure, and the first traction rod driven arm 34-1, the first traction rod latch arm 34-2, and the first traction rod connecting arm 34-3 are distributed sequentially along the circumference of the first traction rod body 34-0. Furthermore, the included angle between the first traction rod latch arm 34-2 and the first traction rod driven arm 34-1 is an obtuse angle.

[0116] Preferably, as shown in FIG10, the first traction rod 34 further includes a first traction rod spring arm 34-4, and the first traction rod driven arm 34-1, the first traction rod spring arm 34-4, the first traction rod latch arm 34-2, and the first traction rod connecting arm 34-3 are distributed sequentially along the circumferential direction of the first traction rod body 34-0.

[0117] In the circuit breaker of the present invention, the first traction rod 34 can simultaneously engage with the moving contact 41, the test button 46, and the second traction rod 49 to trip the operating mechanism in three different ways.

[0118] Figure 5c shows an embodiment of the thermomagnetic tripping mechanism: The thermomagnetic tripping mechanism includes a thermomagnetic tripping yoke 54, a thermomagnetic tripping armature 53, a bimetallic element 51, and an armature transmission component 50. The thermomagnetic tripping armature 53 is rotatably mounted on the thermomagnetic tripping yoke 54 via an armature shaft 52-1, and the armature transmission component 50 is rotatably mounted on the thermomagnetic tripping yoke 54 via a transmission component shaft 52-2. The thermomagnetic tripping armature 53 is driven by the armature transmission component 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 by 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 thermomagnetic tripping yoke 54, the thermomagnetic tripping armature 53, the bimetallic element 51, and the armature transmission component 50 can all be implemented using existing technology, and will not be described in detail here.

[0119] As shown in Figure 12, the second traction rod 49 further includes a second traction rod armature engagement arm 49-2 and a second traction rod bimetallic engagement arm 49-3 respectively disposed on the second traction rod body 49-0, which are respectively engaged with the armature transmission component 50 and the bimetallic element 51; the second traction rod body 49-0 is rotatably mounted on the housing of the splitting unit via the second traction rod shaft 56. Furthermore, a second design distance is provided between the armature transmission component 50 and the second traction rod armature engagement arm 49-2 to prevent the operating mechanism from disengaging due to product vibration.

[0120] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. An operating mechanism for a circuit breaker, comprising a bracket (1), a rocker arm assembly, a jump fastener (7), a locking fastener (10), and a re-fastener (9) rotatably mounted on the bracket (1), a first crank (14), an energy storage spring (4), a slide rail (1-0) fixedly mounted relative to the bracket (1), a slider (18), a first connecting rod (16), a second connecting rod (19), and a second crank (22) rotatably mounted around a sixth center (6S); the locking fastener (10) engages with the jump fastener (7) and is limited by the re-fastener (9); one end of the first crank (14) is rotatably mounted around an eighth center (8S) on the jump fastener. On component (7), one end 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), the other end of the energy storage spring (4) is connected to the rocker arm assembly, the other end of the first connecting rod (16) is rotatably connected to the slider (18), the slider (18) is slidably mounted on the slide rail (1-0), one end of the second connecting rod (19) is rotatably connected to the slider (18), and the other end is rotatably connected to the second crank (22) around the eleventh center (11S) to drive its rotation; when the operating mechanism is in the open or tripped state, the slide rail (1-0) and the slider (18) are in a limiting cooperation to prevent the slider (18) from sliding; characterized in that: The operating mechanism further includes a third connecting rod (23) and a third crank (25) rotatably arranged around the seventh center (7S). One end of the second crank (22) and the third connecting rod (23) are rotatably connected around the eleventh center (11S), and the other end of the third connecting rod (23) is rotatably connected to the third crank (25) around the twelfth center (12S) to drive its rotation. The rocker arm assembly and the second crank (22) are located at both 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.

2. The operating mechanism of a 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 located at the four vertices of a quadrilateral; the second crank (22) is rotatably mounted on the support (1) around the sixth center (6S) and the third crank (25) is rotatably mounted on the support (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 through the eleventh shaft (2223). The eleventh shaft (2223) is inserted into the second crank guide hole (1-1). The shape of the second crank guide hole (1-1) matches the movement 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 rotatably connected through the twelfth shaft (2325), the twelfth shaft (2325) is inserted in the third crank guide hole (1-2), and the shape of the third crank guide hole (1-2) matches the movement trajectory of the twelfth shaft (2325).

4. The operating mechanism of a circuit breaker according to claim 1, characterized in that: The second crank (22) is a strip plate structure, with one end rotating around the sixth center (6S) and the other end rotating around the eleventh center (11S) and connected to the third connecting rod (23) and the second connecting rod (19); And / or, the third crank (25) is a triangular plate structure, with its first vertex rotated around the seventh center (7S), its second vertex rotated around the twelfth center (12S) and connected to the third connecting rod (23), and its third vertex rotated to be connected to the moving contact mechanism of the circuit breaker.

5. The operating mechanism of a circuit breaker according to claim 2, characterized in that: The bracket (1) includes two bracket side plates arranged at relative intervals. Each bracket side plate includes a first side plate part and a second side plate part connected to each other. The rocker arm assembly, jump fastener (7), locking fastener (10), re-fastener (9) and second crank (22) are respectively rotatably arranged on the first side plate part. V-grooves and slide rails (1-0) are respectively provided at both ends of the first side plate part in the vertical direction. The second side plate part is connected to one end of the first side plate part in the horizontal direction. The rocker arm assembly is oscillating in the V-groove. The third crank (25) is rotatably arranged on the second side plate part.

6. The operating mechanism of a circuit breaker according to claim 1, characterized in that: The slide rail (1-0) has a groove-like structure or a hole-like structure; And / or, the slide rail (1-0) is mounted on the bracket (1).

7. The operating mechanism of a circuit breaker according to claim 1, characterized in that: The operating mechanism also includes a first traction rod (34) and a transmission jumper (32) that are engaged with a latch and rotated respectively. 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 latch engagement with the first traction rod (34). The first traction rod (34) rotates and drives the operating mechanism to disengage.

8. The operating mechanism of a circuit breaker according to claim 7, characterized in that: The operating mechanism also includes a thermomagnetic tripping mechanism, which drives the first traction rod (34) to rotate and release the latching engagement with the transmission tripping buckle (32) when the circuit breaker experiences a short circuit or overload fault. And / or, when a short circuit fault 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 its latching engagement with the transmission trip buckle (32); And / or, the operating mechanism further includes a sliding test button (46), which is driven by an external force to slide, and the test button (46) drives the first traction rod (34) to actuate and release the buckle engagement with the transmission jump buckle (32).

9. The operating mechanism of a circuit breaker according to claim 1, characterized in that: When the operating mechanism re-engages from the tripped state, the rocker arm assembly of the operating mechanism drives the transmission trip latch (32) to reset and re-engage with the first traction rod (34).

10. A fast trip device for a circuit breaker, characterized by: The fast tripping device includes an operating mechanism and a contact system as described in any one of claims 1-9. The contact system includes a moving contact mechanism and a stationary contact (42) used in conjunction. The moving contact mechanism includes a contact support (40) rotatably disposed around a seventh center (7S), a moving contact (41) disposed on the contact support (40) and rotatably disposed relative to the contact support (40), and a contact spring (47) connected at both ends to the contact support (40) and the moving contact (41) respectively. The device also includes a first transmission structure (43) disposed on the contact support (40) and in transmission cooperation with the moving contact (41), as well as a first traction rod (34) and a transmission jumper (32) in latching cooperation; when short-circuited, the moving contact (41) rotates relative to the contact support (40) under the electric repulsive force, and the moving contact (41) drives the first traction rod (34) to move through the first transmission structure (43) to release the latching cooperation with the transmission jumper (32), and the transmission jumper (32) moves to drive the operating mechanism to disengage.

11. The fast trip unit of a circuit breaker according to claim 10, characterized in that: The first transmission structure (43) is rotatably mounted on the contact support (40); the first traction rod (34) and the transmission buckle (32) are rotatably mounted around the fifth center (5S) and the ninth center (9S) respectively. The first traction rod (34) is driven by the first transmission structure (43) to rotate and release the buckle engagement with the transmission buckle (32).

12. The fast tripping device of a circuit breaker according to claim 10, characterized in that: The fast tripping device also includes a tripping device housing and a second transmission structure. The operating mechanism, the first traction rod (34) and the transmission trip buckle (32) are all located outside the tripping device housing. The contact system and the first transmission structure (43) are all located inside the tripping device housing. One end of the second transmission structure is located inside the tripping device housing and is in transmission cooperation with the first transmission structure (43), and the other end is located outside the tripping device housing and is in transmission cooperation with the first traction rod (34).

13. The fast trip unit of a circuit breaker according to claim 10, wherein: A drive gap is provided in the transmission path from the moving contact (41) to the operating mechanism. The drive gap causes the moving contact (41) to rotate through a preset angle before the operating mechanism is driven to disengage.

14. The fast trip unit of claim 10, wherein: The moving contact (41) is rotatably mounted on the contact support (40) around the seventh center (7S); when the moving contact (41) and the stationary contact (42) are normally closed or open, the contact spring (47) is located in the first position, and the first center (7S) is located on one side 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), causing the moving contact (41) to rotate relative to the contact support (40) to the repulsion position, the moving contact (41) drives the contact spring (47) to swing to the second position, and the first center (7S) is located on the other side of the contact spring (47). The contact spring (47) applies a force to the moving contact (41) to keep the moving contact (41) in the repulsion position.

15. A circuit breaker comprising an operating mechanism of the circuit breaker according to any one of claims 1-9 and at least one set of breaking units, the breaking 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 cooperation, the moving contact mechanism comprising a contact support (40) rotatably disposed about a seventh center (7S) and a moving contact (41) disposed on the contact support (40), the contact support (40) being drivenly connected to a third crank (25), and the rocker arm assembly, the second crank (22) and the arc-extinguishing chamber being arranged sequentially along the vertical direction of the operating mechanism.

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