Fast closing mechanism of circuit breaker

Abstract

The application relates to the low-voltage electrical field, in particular to a quick closing mechanism of a circuit breaker, wherein the operating mechanism comprises a first connecting rod, a closing mechanism, a second connecting rod and a transmission mechanism connected with a movable contact mechanism drive of the circuit breaker, a button mechanism, the first connecting rod, the closing mechanism, the second connecting rod and the transmission mechanism are sequentially and drivingly connected; the closing mechanism comprises a first handle and a second handle which are respectively pivotally arranged, a handle limiting part and a handle energy storage part which are in limiting cooperation with the second handle; when the circuit breaker is closed, the button mechanism drives the first handle to rotate through the first connecting rod, the handle energy storage part stores energy, after the first handle drives the handle limiting part to act and makes the handle limiting part release the limiting cooperation with the second handle, the handle energy storage part releases energy to make the second handle rotate, the second handle drives the transmission mechanism to rotate through the second connecting rod, and the transmission mechanism drives the movable contact mechanism to act; the quick closing mechanism is simple in structure and can realize the quick closing of the circuit breaker.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical equipment, and more specifically to a fast closing mechanism for a circuit breaker. Background Technology

[0002] The trend towards miniaturization of low-voltage electrical appliances requires circuit breakers to simultaneously meet performance indicators such as higher breaking capacity and longer service life.

[0003] Existing circuit breakers control the connection and disconnection of circuits using only one moving contact and one stationary contact. When the circuit breaker disconnects the circuit under fault conditions such as overload or short circuit, the electric arc generated between the moving and stationary contacts not only burns the moving and stationary contacts, affecting their lifespan, but also affects the breaking performance of the circuit breaker. By incorporating a double-break contact system, circuit breakers can reduce the erosion of the moving and stationary contacts by the arc and significantly improve the breaking capacity of the circuit breaker. However, existing rotary double-break contact systems have poor reliability and are prone to failure. Moreover, plug-in circuit breakers using double-break contact systems have more parts, a complex structure, difficult spatial layout design, and time-consuming and labor-intensive installation, reducing work efficiency and increasing costs. Furthermore, plug-in circuit breakers using double-break contact systems cannot achieve rapid opening and closing, which limits the improvement of the breaking performance of plug-in circuit breakers. Summary of the Invention

[0004] The purpose of this invention is to overcome the defects of the prior art and provide a fast closing mechanism for a circuit breaker, which has a simple structure and can realize the fast closing of the circuit breaker.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A fast closing mechanism for a circuit breaker includes a button mechanism and an operating mechanism. The operating mechanism includes a first link, a closing mechanism, a second link, and a transmission mechanism driven and connected to the moving contact mechanism of the circuit breaker. The button mechanism, the first link, the closing mechanism, the second link, and the transmission mechanism are sequentially driven and connected. The closing mechanism includes a first handle and a second handle pivotally mounted, a handle limiting member that limits the second handle, and a handle energy storage member. When the circuit breaker is closed, the button mechanism drives the first handle to rotate via the first link, causing the handle energy storage member to store energy. After the first handle rotates, it drives the handle limiting member to move, releasing the limiting member from the second handle. The handle energy storage member then releases the energy, causing the second handle to rotate. The second handle drives the transmission mechanism to rotate via the second link, causing it to drive the moving contact mechanism to move.

[0007] Preferably, the handle energy storage component is an energy storage torsion spring, and the first handle, the second handle, and the handle energy storage component are coaxially arranged, with both ends of the handle energy storage component engaging with the first handle and the second handle respectively; the button mechanism drives the first handle to rotate relative to the second handle through the first connecting rod, so that the handle energy storage component stores energy.

[0008] Preferably, the handle energy storage component applies a force to the second handle, causing it to engage with the first handle in a limiting position. When the circuit breaker is closed, the button mechanism drives the first handle, the handle energy storage component, and the second handle to rotate synchronously through the first link until the second handle engages with the handle limiting component. The button mechanism then drives the first handle to rotate relative to the second handle through the first link, causing the handle energy storage component to store energy. The first handle drives the handle limiting component to release its limiting engagement with the second handle, and the handle energy storage component releases energy to drive the second handle to rotate.

[0009] Preferably, the first handle includes a first handle body, a first handle assembly cavity is provided in the middle of the first handle body, and an energy storage torsion spring is disposed in the first handle assembly cavity; the second handle includes a second handle body, one end of the second handle body is inserted into the middle of the energy storage torsion spring.

[0010] Preferably, the first handle further includes a spring slot on the side wall of the first handle assembly cavity, and one end of the energy storage torsion spring is locked in the spring slot; the second handle body includes a second handle column and a second handle base that are coaxially arranged at both ends, the outer diameter of the second handle column is smaller than the outer diameter of the second handle base, the second handle column is inserted into the middle of the energy storage torsion spring, and the circumferential part of the second handle base is provided with a spring insertion hole that limits and cooperates with the other end of the energy storage torsion spring.

[0011] Preferably, the second handle body further includes a second handle mounting plate, the second handle column, the second handle mounting plate and the second handle base are coaxially arranged and connected in sequence, the outer diameters of the second handle column, the second handle mounting plate and the second handle mounting plate increase in sequence, and the energy storage torsion spring is limited between the first handle and the second handle mounting plate.

[0012] Preferably, the first handle includes a first handle limiting part disposed on the circumferential side of the first handle body, and the second handle includes a second handle limiting part disposed on the circumferential side of the second handle body, and the handle energy storage member enables the second handle limiting part to engage with the first handle limiting part.

[0013] Preferably, the second handle limiting part is driven and connected to the transmission mechanism via a second connecting rod.

[0014] Preferably, the first handle further includes a first handle driving part disposed on the first handle body, the first handle driving part driving the handle limiting member to rotate, so that the handle limiting member releases its limiting engagement with the second handle.

[0015] Preferably, the first handle further includes a first handle connecting portion disposed on the circumferential side of the first handle body, and the button mechanism is drivenly connected to the first handle connecting portion via a first connecting rod.

[0016] Preferably, the handle limiting member is rotatably configured, and the first handle drives the handle limiting member to rotate so that it releases its limiting engagement with the second handle; the handle limiting member includes a limiting member driven part that engages with the first handle and a limiting member limiting structure that engages with the second handle.

[0017] Preferably, the second connecting rod passes through the second handle to form a connecting rod protrusion, and the second handle engages with the limiting structure of the limiting member through the connecting rod protrusion.

[0018] Preferably, the handle limiting member further includes a limiting member groove. In the pair of side walls of the limiting member groove, a limiting member limiting part is formed on one side wall and a limiting member moving part is formed on the other side wall. The limiting member groove includes a slotted bottom surface and a slotted limiting surface connected in sequence. The slotted limiting surface is a limiting member limiting structure that is limited and cooperates with the protruding end of the connecting rod.

[0019] Preferably, the closing mechanism further includes a limit member return spring, which applies a force to the handle limit member, causing the handle limit member to tend to move toward the second handle.

[0020] Preferably, the transmission mechanism includes a lever, a locking element, a tripping element, and a rocker arm. The lever is rotatably mounted on the housing structure of the circuit breaker. The locking element and the tripping element are rotatably mounted on the lever and locked together. One end of the rocker arm is rotatably connected to the lever, and the other end is rotatably connected to the moving contact mechanism. The second handle of the closing mechanism is drivenly connected to the locking element through a second connecting rod.

[0021] The fast closing mechanism of the present invention has a simple structure. Through the coordinated operation of the first handle, the second handle, the handle energy storage component, and the handle limiting component, the energy storage component of the handle can store and release energy quickly. The second handle drives the transmission mechanism to rotate quickly, and the transmission mechanism drives the moving contact mechanism to rotate quickly, so that the moving contact mechanism can quickly close with the first stationary contact and the second stationary contact respectively. This helps to reduce or avoid the generation of electric arc when the moving / stationary contacts are closed, and improves the current carrying capacity of the circuit breaker. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the circuit breaker of the present invention, showing the spatial layout of the internal components of the circuit breaker;

[0023] Figure 2 This is a three-dimensional structural schematic diagram of the circuit breaker of the present invention;

[0024] Figure 3This is an exploded structural diagram of the first handle, the handle energy storage component, and the second handle of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of the handle limiting component of the present invention;

[0026] Figure 5 This is an exploded structural diagram of the transmission mechanism of the present invention;

[0027] Figure 6a This is a schematic diagram of the projected structure of the circuit breaker of the present invention, with the circuit breaker in the open state;

[0028] Figure 6b This is a schematic diagram showing the cooperation relationship between the second link and the handle limiting member when the circuit breaker of the present invention is in the open state;

[0029] Figure 7a This is a schematic diagram of the projected structure of the circuit breaker of the present invention, showing the circuit breaker in the closing process;

[0030] Figure 7b This is a schematic diagram showing the second connecting rod and the handle limiting component in a limiting engagement during the closing process of the circuit breaker of the present invention;

[0031] Figure 8 This is a schematic diagram of the projected structure of the circuit breaker of the present invention, with the circuit breaker in the closed state;

[0032] Figure 9 This is a cross-sectional structural schematic diagram of the moving contact mechanism of the present invention;

[0033] Figure 10 This is a schematic diagram of the structure of the moving contact mechanism of the present invention closing with the first stationary contact and the second stationary contact;

[0034] Figure 11 This is a schematic diagram of the cooperative structure of the moving contact mechanism, the first stationary contact, the second stationary contact, and the operating mechanism of the present invention;

[0035] Figure 12 This is a schematic diagram of the projected structure of the second embodiment of the circuit breaker of the present invention;

[0036] Figure 13 This is a three-dimensional structural schematic diagram of the second embodiment of the circuit breaker of the present invention;

[0037] Figure 14 This is a schematic diagram of the connection structure supported by the two contacts of the present invention. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1-11 The given embodiments further illustrate specific implementations of the circuit breaker of the present invention. The circuit breaker of the present invention is not limited to the descriptions of the following embodiments.

[0039] like Figure 1 The diagram shows a first embodiment of the circuit breaker of the present invention. In this embodiment, the circuit breaker is preferably a single-phase plug-in circuit breaker.

[0040] like Figure 1 As shown, the circuit breaker of the first embodiment includes a push-button mechanism 1, an operating mechanism, and a first breaking pole. The first breaking pole includes a contact system, an arc-extinguishing system, an incoming terminal, and an outgoing terminal, which are respectively the first contact system, the first arc-extinguishing system, the first incoming terminal 11-0a, and the first outgoing terminal 11-1a. The first contact system includes a first moving contact mechanism 7a and a first stationary contact 12-0a and a second stationary contact 12-1a respectively disposed on both sides of the first moving contact mechanism 7a. The first arc-extinguishing system includes a first arc-extinguishing chamber 8-0a and a second arc-extinguishing chamber 8-1a. The push-button mechanism 1, the operating mechanism, and the first moving contact mechanism 7a are also included. The components 7a are sequentially connected and driven; the button mechanism 1, the operating mechanism and the first incoming terminal 11-0a are sequentially arranged along the length direction of the circuit breaker and are all located on one side of the width direction of the circuit breaker; the first outgoing terminal 11-1a, the second arc-extinguishing chamber 8-1a, the first moving contact mechanism 7a and the first arc-extinguishing chamber 8-0a are sequentially arranged along the length direction of the circuit breaker and are all located on the other side of the width direction of the circuit breaker, the first outgoing terminal 11-1a and the button mechanism 1 are located at one end of the length direction of the circuit breaker, and the first arc-extinguishing chamber 8-0a and the first incoming terminal 11-0a are located at the other end of the length direction of the circuit breaker.

[0041] The circuit breaker of this invention has a reasonable and compact internal layout, which conforms to the trend of miniaturization of circuit breakers and is conducive to saving space; moreover, the use of a double-break contact system is conducive to improving the breaking capacity and current carrying performance of the circuit breaker.

[0042] like Figure 1 As shown, the first circuit breaker also includes a short-circuit protection mechanism 9 and an overload protection mechanism 10. The overload protection mechanism 10 and the operating mechanism are stacked together along the thickness direction of the circuit breaker. The short-circuit protection mechanism 9 is located between the first outgoing terminal 11-1a and the second arc-extinguishing chamber 8-1a.

[0043] like Figure 1-2 As shown in Figures 6a, 7a, and 8, the operating mechanism includes a closing mechanism 3 and a transmission mechanism 5. The button mechanism 1, closing mechanism 3, transmission mechanism 5, and first incoming line terminal 11-0a are sequentially arranged along the length of the circuit breaker. The button mechanism 1, closing mechanism 3, transmission mechanism 5, and first moving contact mechanism 7a are sequentially driven. Furthermore, the operating mechanism also includes a first connecting rod 2 and a second connecting rod 4. The button mechanism 1 is driven and connected to the closing mechanism 3 via the first connecting rod 2, and the closing mechanism 3 is driven and connected to the transmission mechanism 5 via the second connecting rod 4.

[0044] Preferred, such as Figure 1As shown, the inlet of the first arc-extinguishing chamber 8-0a is opposite to the breaking gap between the first moving contact mechanism 7a and the first stationary contact 12-0a; the inlet of the second arc-extinguishing chamber 8-1a is opposite to the breaking gap between the first moving contact mechanism 7a and the second stationary contact 12-1a.

[0045] Specifically, such as Figure 1 In the direction shown, with Figure 1 The top, bottom, left, right, and front sides of the circuit breaker are respectively the top, bottom, left, right, and front sides of the circuit breaker. The button mechanism 1, first link 2, closing mechanism 3, second link 4, transmission mechanism 5, and first input terminal 11-0a are arranged sequentially from top to bottom. The two ends of the first link 2 are rotatably connected to the button mechanism 1 and the closing mechanism 3, respectively. The two ends of the second link 4 are rotatably connected to the closing mechanism 3 and the transmission mechanism 5, respectively. The button mechanism 1, first link 2, closing mechanism 3, second link 4, transmission mechanism 5, and first moving contact mechanism 7a are sequentially driven and connected. The button mechanism 1, the operating mechanism, and the first input terminal 11-0a are located on the right side of the circuit breaker. The first outgoing terminal 11-1, short-circuit protection mechanism 9, second arc-extinguishing chamber 8-1a, first moving contact mechanism 7a, and first arc-extinguishing chamber 8-0a are arranged sequentially from top to bottom. The first outgoing terminal 11-1a and the push-button mechanism 1 are both located at the upper end of the circuit breaker, while the first arc-extinguishing chamber 8-0a and the first incoming terminal 11-0a are arranged side by side at the lower end of the circuit breaker. The overload protection mechanism 10 and the transmission mechanism 5 are stacked one after the other.

[0046] Preferred, such as Figure 1 As shown, the first incoming terminal 11-0a is connected in series with the first stationary contact 12-0a, the second stationary contact 12-1a, the overload protection mechanism 10, the short circuit protection mechanism 9 and the first outgoing terminal 11-1a are connected in series in sequence, and the first moving contact mechanism 7a cooperates with the first stationary contact 12-0a and the second stationary contact 12-1a respectively.

[0047] like Figure 1-8 As shown, the circuit breaker of the present invention also includes a fast closing mechanism, which can realize the fast closing operation of the circuit breaker.

[0048] like Figure 1-8As shown, the fast closing mechanism includes a button mechanism 1 and an operating mechanism. The operating mechanism includes a first link 2, a closing mechanism 3, a second link 4, and a transmission mechanism 5. The closing mechanism 3 includes a first handle 3-0 and a second handle 3-1, which are pivotally mounted, a handle limiting member 3-2 that is limited to the second handle 3-1, and a handle energy storage member 3-3. When the circuit breaker is closed, the button mechanism 1 drives the first handle 3-0 to rotate through the first link 2, causing the handle energy storage member 3-3 to store energy. Then, the first handle 3-0 continues to rotate, driving the handle limiting member 3-2 to move and release its limited engagement with the second handle 3-1. The handle energy storage member 3-3 then releases energy, causing the second handle 3-1 to rotate rapidly. The second handle 3-1 drives the transmission mechanism 5 to rotate through the second link 4, causing the first moving contact mechanism 7a to move. The first moving contact mechanism 7a closes with the first stationary contact 12-0a and the second stationary contact 12-1a, respectively, to achieve fast closing. The handle energy storage component 3-3 is disposed between the first handle 3-0 and the second handle 3-1. When the button mechanism 1 drives the first handle 3-0 to rotate via the first connecting rod 2, causing the handle energy storage component 3-3 to store energy, the second handle 3-1 is limited by the handle limiting component 3-2 and cannot rotate. After the handle energy storage component 3-3 completes energy storage, the first handle 3-0 drives the handle limiting component 3-2 to release its limiting engagement with the second handle 3-1, and the handle energy storage component 3-3 releases energy to drive the second handle 3-1 to rotate.

[0049] The fast closing mechanism has a simple structure. Through the coordinated operation of the first handle, the second handle, the handle energy storage component, and the handle limiting component, the energy storage component of the handle can store and release energy quickly. This allows the second handle to drive the transmission mechanism to rotate quickly, which in turn drives the moving contact mechanism to rotate quickly. This enables the moving contact mechanism to quickly close with the first stationary contact and the second stationary contact, respectively. This helps to reduce or avoid the generation of electric arcs when the moving / stationary contacts are closed, and improves the current carrying capacity of the circuit breaker.

[0050] Preferred, such as Figure 3 As shown, the handle energy storage component 3-3 is an energy storage torsion spring. The first handle 3-0, the second handle 3-1, and the handle energy storage component 3-3 are coaxially arranged, and both ends of the handle energy storage component 3-3 cooperate with the first handle 3-0 and the second handle 3-1, respectively. The button mechanism 1 drives the first handle 3-0 to rotate relative to the second handle 3-1 through the first connecting rod 2, so that the handle energy storage component 3-3 stores energy. Further, as... Figure 2 and 3 As shown, the handle energy storage component 3-3 applies a force to the second handle 3-1, causing it to engage with the first handle 3-0, thus keeping the first handle 3-0 and the second handle 3-1 in a relatively stationary state.

[0051] It should be noted that the first handle 3-0 and the second handle 3-1 may not be coaxially arranged. Instead, their rotation axes may be parallel and spaced apart, and they are connected by a handle energy storage component 3-3. That is, when the circuit breaker is closed, the first handle 3-0 stores energy in the handle energy storage component 3-3, and the handle energy storage component 3-3 releases energy to drive the second handle 3-1 to rotate. When the circuit breaker is opened, the second handle 3-1 rotates the first handle 3-0 back to its initial position through the handle energy storage component 3-3. Furthermore, the handle energy storage component 3-3 is not limited to a torsion spring; it can also be other forms of energy storage components, such as spring sheets, tension springs, compression springs, etc. Of course, when the handle energy storage component 3-3 adopts a form other than a torsion spring, the structure of the first handle 3-0 and the second handle 3-1 needs to be appropriately adjusted to accommodate the change in the handle energy storage component 3-3.

[0052] Preferred, such as Figure 1-2 As shown in Figures 6a-8, the handle limiting member 3-2 is rotatably configured. When the circuit is closed, after the first handle 3-0 rotates through a certain angle, it drives the handle limiting member 3-2 to rotate, thereby releasing it from its limiting engagement with the second handle 3-1. It should be noted that the handle limiting member 3-2 is not limited to a rotatable configuration; it can also be slidably configured (for example, slidably configured on the circuit breaker housing structure or on a separately configured support structure). After the first handle 3-0 rotates through a preset angle, it drives the handle limiting member 3-2 to slide, thereby releasing it from its limiting engagement with the second handle 3-1.

[0053] Preferred, such as Figure 6a-8 As shown, when the circuit breaker of the present invention is closed, the button mechanism 1 drives the first handle 3-0 and the second handle 3-1 to rotate synchronously through the first connecting rod 2 until the second connecting rod 4 is limited by the handle limiting member 3-2. After the second handle 3-1 is limited, the button mechanism 1 drives the first handle 3-0 to rotate relative to the second handle 3-1 and causes the handle energy storage member 3-3 to store energy. Then, after the first handle 3-0 rotates through a certain angle, it drives the handle limiting member 3-2 to rotate, thereby releasing its limiting engagement with the second handle 3-1. The handle energy storage member 3-3 then releases energy and drives the second handle 3-1 to rotate. The transmission process described above helps to reduce the operating force required by the user. Of course, it is also possible that the second handle 3-1 and the handle limiting member 3-2 are already in a limiting engagement when the circuit breaker is open. That is, when the closing begins, the button mechanism 1 drives the first handle 3-0 to rotate relative to the second handle 3-1 through the first connecting rod 2 and compresses the handle energy storage member 3-3.

[0054] Specifically, in combination Figures 6a-7aAs shown, the button mechanism 1 drives the first handle 3-0, the handle energy storage component 3-3, and the second handle 3-1 to rotate clockwise synchronously via the first connecting rod 2. The second handle 3-1 engages with the handle limiting component 3-2. The button mechanism 1 then drives the first handle 3-0 to rotate clockwise relative to the second handle 3-1 via the first connecting rod 2. Because the second handle 3-1 cannot rotate due to the limitation imposed by the handle limiting component 3-2 on the second connecting rod 4, the energy storage torsion spring is twisted to store energy. After the first handle 3-0 rotates through a preset angle (i.e., after the energy storage torsion spring has completed energy storage), the first handle 3-0 drives the handle limiting component 3-2 to rotate, releasing it from the limiting engagement with the second handle 3-1 (specifically, the first handle 3-0 drives the handle limiting component 3-2 to rotate, releasing it from the limiting engagement with the protruding end of the connecting rod 4). The energy storage torsion spring then begins to release energy and drives the second handle 3-1 to rotate rapidly clockwise, thereby achieving rapid closing of the circuit breaker.

[0055] It should be noted that in the circuit breaker of the present invention, a traditional handle that is rotatably mounted on the housing structure of the circuit breaker can also be used instead of the closing mechanism 3 of this application. That is, the button mechanism 1 is sequentially driven and connected to the locking part 5-1 of the transmission mechanism 5 through the first connecting rod 2, the handle, and the second connecting rod 4. However, the fast closing function that the closing mechanism 3 of this application can achieve will inevitably be lost.

[0056] like Figure 3-4 As shown in Figures 6-8, this is one embodiment of the closing mechanism 3.

[0057] like Figure 3 As shown, the first handle 3-0 includes a first handle body 3-00, and a first handle assembly cavity 3-04 is provided in the middle of the first handle body 3-00. An energy storage torsion spring (i.e., a handle energy storage component 3-3) is disposed in the first handle assembly cavity 3-04. The second handle 3-1 includes a second handle body, and one end of the second handle body is inserted into the middle of the energy storage torsion spring. The two ends of the energy storage torsion spring are respectively limited and engaged with the first handle 3-0 and the second handle 3-1.

[0058] Preferred, such as Figure 3 As shown, the first handle 3-0 further includes a spring slot on the side wall of the first handle assembly cavity 3-04, with one end of the energy storage torsion spring locked in the spring slot; the second handle body includes a second handle post 3-12 and a second handle base 3-10 coaxially disposed at both ends, the outer diameter of the second handle post 3-12 being smaller than the outer diameter of the second handle base 3-10, the second handle post 3-12 being inserted into the middle of the energy storage torsion spring, and the circumferential portion of the second handle base 3-10 having a spring insertion hole 3-100 that limits and cooperates with the other end of the energy storage torsion spring. Further, as... Figure 3As shown, the second handle body also includes a second handle mounting plate 3-13, a second handle column 3-12, a second handle mounting plate 3-13 and a second handle base 3-10, which are coaxially arranged and connected in sequence. The outer diameters of the second handle column 3-12, the second handle mounting plate 3-13 and the second handle base 3-10 increase in sequence. The energy storage torsion spring is limited between the second handle mounting plate 3-13 and the first handle 3-0.

[0059] Specifically, such as Figure 3 As shown, the energy storage component 3-3 of the handle is an energy storage torsion spring. The energy storage torsion spring includes a torsion spring body coaxially arranged with the first handle 3-0, a first end 3-31 of the torsion spring that cooperates with the first handle body 3-00 of the first handle 3-0, and a second end 3-30 of the torsion spring that cooperates with the second handle base 3-10 of the second handle 3-1. The torsion spring body is limited between the bottom wall of the first handle assembly cavity 3-04 and the second handle mounting plate 3-13.

[0060] Preferred, such as Figure 3 As shown, the first handle 3-0 includes a first handle limiting part 3-01 disposed on the circumferential side of the first handle body 3-00, and the second handle 3-1 includes a second handle limiting part 3-11 disposed on the axial side of the second handle body. The handle energy storage member 3-3 enables the second handle limiting part 3-11 to be limited and engaged with the first handle limiting part 3-01. Further, one end of the second handle limiting part 3-11 is connected to the circumferential side of the second handle mounting plate 3-13, and the other end extends in the same direction as the second handle post 3-12, with the two arranged side-by-side at intervals. Figure 2 As shown, after the first handle 3-0, the handle energy storage component 3-3, and the second handle 3-1 are assembled, the second handle column 3-12 and the second handle limiting part 3-13 are located inside and outside the first handle body 3-00, respectively.

[0061] Preferred, such as Figure 3 As shown, the second handle 3-1 also has a second handle shaft hole 3-101 in the middle.

[0062] Preferred, such as Figure 2-3 As shown, the second handle limiting part 3-13 is driven and connected to the transmission mechanism 5 through the second connecting rod 4. The second handle limiting part 3-13 has a limiting part connecting hole 3-110 in the middle, which is rotatably connected to the second connecting rod 4.

[0063] Preferred, such as Figure 2 and 3 As shown, the first handle 3-0 also includes a first handle connecting part 3-03 disposed on the circumferential side of the first handle body 3-00, and the button mechanism 1 is drivenly connected to the first handle connecting part 3-03 through the first connecting rod 2.

[0064] like Figure 4 As shown, the handle limiting member 3-2 includes a limiting member driven part 3-25 that drives and cooperates with the first handle 3-0, and a limiting member limiting structure that limits and cooperates with the second handle 3-1; the first handle 3-0 drives the handle limiting member 3-2 to rotate through the limiting member driven part 3-25, causing the limiting member limiting part 3-26 to release its limiting cooperation with the second handle 3-1. Further, as... Figure 3 As shown, the first handle 3-0 also includes a first handle drive part 3-02 disposed on the first handle body 3-00, and the first handle drive part 3-02 is driven to cooperate with the limit member driven part 3-25 of the handle limit member 3-2.

[0065] Preferred, such as Figure 2 , 6b As shown in Figure 7b, the second connecting rod 4 passes through the second handle 3-1 to form a connecting rod protrusion. The second handle 3-1 engages with the limiting structure of the limiting member through the connecting rod protrusion, which simplifies the structure of the closing mechanism 3. Of course, the second handle 3-1 can also be provided with a separate structure for engaging with the handle limiting member 3-2 to replace the connecting rod protrusion, but this would complicate the structure of the second handle 3-1. That is, the second handle 3-1 can engage directly with the handle limiting member 3-2, or indirectly with it. However, in essence, in both cases, the handle limiting member 3-2 limits the second handle 3-1. Therefore, from an overall perspective, the second handle 3-1 engages with the handle limiting member 3-2.

[0066] Preferred, such as Figure 4 , 6b As shown in 7b, the handle limiting member 3-2 also includes a limiting member slot. In the pair of side walls of the limiting member slot, a limiting member limiting part 3-26 is formed on one side wall, and a limiting member moving part 3-25 is formed on the other side wall. Furthermore, the limiting member slot includes a slotted bottom surface 3-23 and a slot limiting surface 3-24 connected in sequence. The slot limiting surface 3-24 is a limiting structure of the limiting member, which cooperates with the protruding end of the connecting rod for limiting. Specifically, when the circuit breaker is in the open state, the protruding end of the connecting rod of the second connecting rod 4 contacts and cooperates with the slotted bottom surface 3-23. When the circuit breaker is closed, the first handle 3-0 drives the second handle 3-1 to rotate through the handle energy storage component 3-3. The second handle 3-1 drives the protruding end of the connecting rod to move from the slotted bottom surface 3-23 to cooperate with the slotted limiting surface 3-24 for limiting, preventing the second handle 3-1 from rotating. The first handle 3-0 continues to rotate relative to the second handle 3-1, so that the handle energy storage component 3-3 stores energy.

[0067] Preferred, such as Figure 4As shown, one end of the handle limiting member 3-2 is provided with a limiting member shaft hole 3-20, and the other end is provided with a limiting member spring hole 3-21 that cooperates with the limiting member return spring 3-4. The limiting member slot is provided in the middle of the handle limiting member 3-2 and the opening faces the second connecting rod 4 assembled in the second handle 3-1. The limiting member driven part 3-25 is provided on the side wall of the limiting member slot near the limiting member shaft hole 3-20, and the limiting part 3-26 constitutes the other side wall of the limiting member slot.

[0068] like Figure 1-2 As shown in Figures 6a-8, the closing mechanism 3 further includes a limit member return spring 3-4. The limit member return spring 3-4 applies a force to the handle limit member 3-2, causing it to tend to move towards the second handle 3-1. Furthermore, the limit member return spring 3-4 causes the handle limit member 3-2 to tend to swing towards the second handle 3-1. Specifically, in this embodiment, the limit member return spring 3-4 causes the handle limit member 3-2 to tend to rotate clockwise.

[0069] like Figure 1 , 2 As shown in Figures 5, 6a, 7a, and 8, one embodiment of the transmission mechanism 5 is illustrated: the transmission mechanism 5 includes a lever 5-0, a locking element 5-1, a tripping element 5-2, and a rocker arm 5-3. The lever 5-0 is rotatably mounted on the circuit breaker's housing structure. The locking element 5-1 and the tripping element 5-2 are rotatably mounted on the lever 5-0 and locked together. One end of the rocker arm 5-3 is rotatably connected to the lever 5-0, and the other end is rotatably connected to the first moving contact mechanism 7a. The second handle 3-1 of the closing mechanism 3 is drivenly connected to the locking element 5-1 via a second connecting rod 4. Further, as... Figure 5 As shown, the transmission mechanism 5 also includes a jump fastener return spring 5-3, and the jump fastener 5-2 is elastically connected to the lever 5-0 through the jump fastener return spring 5-3; the transmission mechanism 5 also includes a transmission mechanism return spring 5-4, and the lever 5-0 is elastically connected to the circuit breaker housing structure through the transmission mechanism return spring 5-4.

[0070] Preferred, such as Figure 5 As shown, in this embodiment, the jump fastener reset spring 5-3 is a torsion spring, which is sleeved on the rotation axis of the jump fastener 5-2; the transmission mechanism reset spring 5-4 is a torsion spring, which is sleeved on the rotation axis of the lever 5-0.

[0071] Preferred, such as Figure 1 , 2 As shown in Figures 5, 6a, 7a, and 8, the rotation axes of the lever 5-0 and the locking buckle 5-2 coincide. Preferably, the rotation axis of the lever 5-0, the rotation axis of the locking buckle 5-1, and the rotation axis of the rocker arm 5-3 relative to the lever 5-0 are located at the three vertices of a triangle.

[0072] Preferred, such as Figure 1 , 2 As shown in 6a, 7a, 8, and 11, the rocker arm 5-3 is an arc-shaped rod structure, with both ends respectively connected to the lever 5-0 of the transmission mechanism 5 and the contact support 7-0 of the first moving contact mechanism 7a.

[0073] like Figure 1 As shown, the short-circuit protection mechanism 9 is preferably an electromagnetic tripping mechanism, which drives and cooperates with the tripping fastener 5-2 of the transmission mechanism 5; the overload protection mechanism 10 preferably includes a bimetallic strip, which drives and cooperates with the tripping fastener 5-2; when the circuit breaker experiences a short circuit or overload fault, the short-circuit protection mechanism 9 or the overload protection mechanism 10 drives the tripping fastener 5-2 to rotate, so that it releases its locking cooperation with the locking fastener 5-1, thereby disengaging the operating mechanism.

[0074] Specifically, such as Figure 5 As shown, the lever 5-0 is provided with a lever shaft hole 5-01, a rocker arm mounting shaft 5-03, and a locking component mounting shaft 5-02. The jump fastener 5-2 is provided with a jump fastener shaft hole 5-20 corresponding to the lever shaft hole 5-01, a jump fastener short post 5-21 cooperating with the overload protection mechanism 10, and a jump fastener driven arm cooperating with the short circuit protection mechanism 9. The locking component 5-1 is provided with a locking component shaft hole 5-10 cooperating with the locking component mounting shaft 5-02. The rocker arm 5-3 includes a rocker arm body 5-30, a rocker arm first shaft hole 5-31 provided at one end of the rocker arm body 5-30 cooperating with the rocker arm mounting shaft 5-03, and a rocker arm second shaft hole 5-32 provided at the other end of the rocker arm body 5-30 and rotatably connected to the contact support 7-0 of the first moving contact mechanism 7a.

[0075] like Figure 6a-8 As shown, the closing process of the circuit breaker of the present invention will be described below:

[0076] like Figures 6a-6b As shown, when the circuit breaker of the present invention is in the open state, the protruding end of the second connecting rod 4 is in contact with the slotted bottom surface 3-23 of the limiting member groove of the handle limiting member 3-2, and the protruding end of the connecting rod has not yet been limited by the handle limiting member 3-2; as Figures 7a-7bAs shown, when the circuit breaker of the present invention is closed, the button mechanism 1 drives the first handle 3-0, the handle energy storage component 3-3, and the second handle 3-1 to rotate synchronously (preferably clockwise) through the first connecting rod 2. At the same time, the second handle 3-1 drives the moving contact 7-1 of the first moving contact mechanism 7a to rotate from the open position to the closed position through the second connecting rod 4, until the second handle 3-1 contacts the slotted limiting surface 3-24 of the limiting component through the protruding end of the connecting rod, so that the two form a limiting engagement. The slotted limiting surface 3-24 then prevents the second handle 3-1 from continuing to rotate, and the moving contact 7-1 also remains stationary. The button mechanism 1 drives the first handle 3-0 to rotate through the first connecting rod 2, so that the first handle 3-0 rotates relative to the second handle 3-1. The first handle 3-0 continues to rotate, causing the handle energy storage component 3-3 to begin storing energy. As the first handle 3-0 continues to rotate, it drives the handle limiting component 3-2 to rotate via the limiting component driven part 3-25 of the handle limiting component 3-2, causing the limiting part 3-26 of the handle limiting component 3-2 to release its limiting engagement with the protruding end of the second connecting rod 4. Then, the handle energy storage component 3-3 begins to release energy and drives the second handle 3-1 to rotate rapidly. The second handle 3-1 then drives the transmission mechanism 5 to rotate rapidly via the second connecting rod 4. The transmission mechanism 5 drives the first moving contact mechanism 7a to rotate rapidly, causing the moving contact 7-1 to quickly close with the first stationary contact 12-0a and the second stationary contact 12-1a, achieving rapid closing of the circuit breaker and entering the following... Figure 8 The shown is the closed state. Further, in conjunction with... Figure 8 As shown, when the circuit breaker is in the closed state, the free end of the limiting part 3-26 of the limiting member abuts against the protruding end of the connecting rod of the second connecting rod 4; and / or, the first handle driving part 3-02 of the first handle 3-0 abuts against the moving part 3-25 of the limiting member of the handle limiting member 3-2.

[0077] like Figure 12-14 As shown, this is a second embodiment of the circuit breaker of the present invention. In this embodiment, the circuit breaker is preferably a two-phase plug-in circuit breaker.

[0078] The difference between the circuit breaker in the second embodiment and the circuit breaker in the first embodiment is that it also includes a second breaking pole. The first and second breaking poles are stacked along the thickness direction of the circuit breaker and both include a contact system and an arc-extinguishing system. Each contact system includes a moving contact mechanism and a stationary contact that work together. The two moving contact mechanisms are synchronously rotated. The operating mechanism is driven and connected to at least one moving contact mechanism. An insulating partition 13 is provided between the first and second breaking poles. Each moving contact mechanism includes a rotating contact support 7-0 and a moving contact 7-1. The moving contact 7-1 is disposed on the contact support 7-0 and its two ends protrude outwards from the radial ends of the contact support 7-0, respectively cooperating with the two stationary contacts. Each arc-extinguishing system includes two arc-extinguishing chambers disposed on both sides of the moving contact mechanism, respectively disposed opposite to the breaking gap formed by the moving contact 7-1 and the corresponding two stationary contacts.

[0079] The circuit breaker of the second embodiment shares a button mechanism and an operating mechanism with its first and second breaking poles, which helps to simplify the internal space and reduce the size of the circuit breaker; moreover, both the first and second breaking poles are provided with a contact system with a double-break structure, which helps to improve the breaking capacity of the circuit breaker.

[0080] The phrase "the operating mechanism is driven and connected to at least one moving contact mechanism" means that in the circuit breaker of this embodiment, the operating mechanism can be driven and connected to the first moving contact mechanism 7a, and also to the moving contact mechanism of the second breaking pole, or simultaneously to the moving contact mechanisms of both the first and second breaking poles. In the circuit breaker of this embodiment, the operating mechanism is preferably driven and connected to the contact support 7-0 of the first moving contact mechanism 7a via a rocker arm 5-3. The contact support 7-0 is provided with an extended shaft 7-02 that is rotatably connected to the rocker arm 5-3.

[0081] like Figure 13 As shown, the second circuit breaker also includes a second incoming terminal 11-0b and a second outgoing terminal 11-1b. The contact system and arc extinguishing system of the second circuit breaker are the second contact system and the second arc extinguishing system, respectively. The moving contact mechanism of the second contact system is the second moving contact mechanism 7b. The two arc extinguishing chambers of the second arc extinguishing system are the third arc extinguishing chamber 8-0b and the fourth arc extinguishing chamber 8-1b, respectively. The second incoming terminal 11-0b and the first incoming terminal 11-0a, the third arc extinguishing chamber 8-0b and the first arc extinguishing chamber 8-0a, the fourth arc extinguishing chamber 8-1b and the second arc extinguishing chamber 8-1a, the second moving contact mechanism 7b and the first moving contact mechanism 7a are stacked along the thickness direction of the circuit breaker and are located on both sides of the insulating partition 13. The second incoming terminal 11-0b, the first arc extinguishing chamber 8-0a and the first incoming terminal 11-0a are arranged side by side in sequence along the width direction of the circuit breaker.

[0082] like Figure 14As shown, in the two contact supports 7-0 of the moving contact mechanism, one contact support 7-0 is provided with a connecting shaft, and the other contact support 7-0 is provided with a connecting groove. The connecting shaft and the connecting groove are inserted and limited to enable the two contact supports 7-0 to be linked. The insulating partition 13 is provided with an insulating partition clearance hole for the connecting shaft to pass through. Of course, the linkage of the two contact supports 7-0 can also be achieved in many other ways, such as through two parallel and spaced connecting shafts, or through a polygonal linkage shaft that mates with the central shaft hole of the two contact supports 7-0, etc., which will not be listed here.

[0083] like Figure 9-11 The image shows one embodiment of the moving contact mechanism.

[0084] like Figure 9-11 As shown, the moving contact mechanism includes a pivotally mounted contact support 7-0, a moving contact 7-1 that rotates synchronously with and relative to the contact support 7-0, and an elastic element 7-2 disposed between the contact support 7-0 and the moving contact 7-1. The moving contact 7-1 is inserted into the middle of the contact support 7-0, with both ends protruding from both sides of the contact support 7-0. The rotation axes of the moving contact 7-1 and the contact support 7-0 coincide. The moving contact 7-1 has a long rod-shaped structure, and its geometric center coincides with the rotation center. The moving contact mechanism has a simple structure, is easy to assemble, and has good reliability.

[0085] like Figure 9 and 10 As shown, the contact support 7-0 includes a contact mounting cavity 7-0 disposed in its center, and a moving contact 7-1 is inserted into the contact mounting cavity 7-0; the contact mounting cavity 7-0 includes a middle part of the mounting cavity and two end parts of the mounting cavity, the two end parts of the mounting cavity being located on both sides of the middle part of the mounting cavity and communicating with the middle part of the mounting cavity respectively; the moving contact 7-1 includes a contact bridge 7-10 and a moving contact 7-11, the contact bridge 7-10 including a contact bridge turntable 7-100 and contact bridge arms 7-101, the two contact bridge arms 7-101 being radially connected to the contact bridge turntable 7-100. The two ends are connected, and the two moving contacts 7-11 are respectively set on the two contact bridge arms 7-101 and located on opposite sides of the contact bridge 7-10. The outer diameter of the contact bridge turntable 7-100 is larger than the width of the contact bridge arm 7-101. The contact bridge turntable 7-100 is set in the middle part of the mounting cavity. The two contact bridges 7-101 protrude on both sides of the contact support 7-0 after passing through the ends of the two mounting cavities. The two elastic elements 7-2 are respectively set in the ends of the two mounting cavities. Each elastic element 7-2 is located between a contact bridge arm 7-101 and the side wall of the mounting cavity.

[0086] Preferred, such as Figure 9-10As shown, the elastic element 7-2 is a contact spring, with two contact springs located on both sides of the contact bridge 7-10. Each contact bridge arm 7-101 has a contact bridge protrusion 7-102, and each mounting cavity end has a spring limiting groove on its side wall. Both ends of each contact spring are respectively limited and engaged with the contact bridge protrusion 7-102 and the spring limiting groove. Alternatively, a protrusion for limiting the contact spring can be provided on the side wall of the mounting cavity end, replacing the spring limiting groove.

[0087] Preferred, such as Figure 9-10 As shown, the turntable mounting cavity is provided with a spring limiting groove 7-01 and a protrusion 7-102 on the contact. The contact spring is limited between the spring limiting groove 7-01 and the protrusion 7-102 in an arc-shaped structure, which limits the two ends of the contact spring. The compression of the contact spring by the moving contact is within the elastic deformation range of the contact spring, and the contact spring will not come out from the end of the mounting cavity.

[0088] Preferred, such as Figure 9-10 As shown, the middle part of the mounting cavity is a circular cavity, and the end of the mounting cavity is a fan-shaped cavity, with the centers of the fan-shaped cavity and the circular cavity coinciding. Further, as... Figure 2 As shown, the mounting cavity end includes a first sector cavity and a second sector cavity connected in sequence. The contact bridge arm 7-101 is inserted into the first sector cavity, and the elastic element 7-2 is disposed in the second sector cavity. The width of the first sector cavity is smaller than the width of the second sector cavity, and the width of the first sector cavity matches the thickness of the contact bridge arm 7-101.

[0089] like Figure 11 As shown, the contact support 7-0 includes at least one extended shaft 7-02, which is disposed on one end face of the contact support 7-0 perpendicular to its axial direction. The axis of the extended shaft 7-02 is parallel to and spaced apart from the rotation axis of the contact support 7-0. The extended shaft 7-02 is driven by an external force to rotate the moving contact mechanism 7. Furthermore, the extended shaft 7-02 cooperates with the second shaft hole 5-32 of the rocker arm 5-3, and the rocker arm 5-3 drives the moving contact mechanism 7 to rotate through the extended shaft 7-02.

[0090] The rocker arm 5-3 is an arc-shaped rod structure, which is set on one side of the moving contact mechanism 7 in the width direction of the circuit breaker. Its two ends are respectively hinged to the lever 5-0 and the extension shaft 7-02 of the contact support 7-0, driving the contact support 7-0 to rotate. This double-break transmission design is not available in the existing technology and is very suitable for circuit breaker structures with small width and thickness.

[0091] 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. A fast closing mechanism for a circuit breaker, comprising a button mechanism (1) and an operating mechanism, the operating mechanism comprising a first link (2), a closing mechanism (3), a second link (4) and a transmission mechanism (5) driven and connected to the moving contact mechanism of the circuit breaker, wherein the button mechanism (1), the first link (2), the closing mechanism (3), the second link (4) and the transmission mechanism (5) are driven and connected in sequence; Its features are: The closing mechanism (3) includes a first handle (3-0) and a second handle (3-1) pivotally mounted, a handle limiting member (3-2) that is limited to the second handle (3-1), and a handle energy storage member (3-3). When the circuit breaker is closed, the button mechanism (1) drives the first handle (3-0) to rotate through the first connecting rod (2). The first handle (3-0) causes the handle energy storage member (3-3) to store energy. After the first handle (3-0) rotates and drives the handle limiting member (3-2) to move, the handle limiting member (3-2) is released from the limited cooperation with the second handle (3-1). The handle energy storage member (3-3) releases energy and causes the second handle (3-1) to rotate. The second handle (3-1) drives the transmission mechanism (5) to rotate through the second connecting rod (4), which in turn drives the moving contact mechanism to move.

2. The fast closing mechanism of the circuit breaker according to claim 1, characterized in that: The handle energy storage component (3-3) is an energy storage torsion spring. The first handle (3-0), the second handle (3-1) and the handle energy storage component (3-3) are coaxially arranged. The two ends of the handle energy storage component (3-3) are respectively engaged with the first handle (3-0) and the second handle (3-1). The button mechanism (1) drives the first handle (3-0) to rotate relative to the second handle (3-1) through the first connecting rod (2), so that the handle energy storage component (3-3) stores energy.

3. The fast closing mechanism of the circuit breaker according to claim 1, characterized in that: The handle energy storage component (3-3) applies a force to the second handle (3-1), causing it to engage with the first handle (3-0) in a limiting position. When the circuit breaker is closed, the button mechanism (1) drives the first handle (3-0), the handle energy storage component (3-3), and the second handle (3-1) to rotate synchronously through the first connecting rod (2) until the second handle (3-1) engages with the handle limiting component (3-2). The button mechanism (1) drives the first handle (3-0) to rotate relative to the second handle (3-1) through the first connecting rod (2) and causes the handle energy storage component (3-3) to store energy. The first handle (3-0) drives the handle limiting component (3-2) to move, causing it to release its limiting engagement with the second handle (3-1). The handle energy storage component (3-3) releases energy and drives the second handle (3-1) to rotate.

4. The fast closing mechanism of the circuit breaker according to claim 2, characterized in that: The first handle (3-0) includes a first handle body (3-00), and a first handle assembly cavity (3-04) is provided in the middle of the first handle body (3-00), and an energy storage torsion spring is disposed in the first handle assembly cavity (3-04); the second handle (3-1) includes a second handle body, and one end of the second handle body is inserted into the middle of the energy storage torsion spring.

5. The fast closing mechanism of the circuit breaker according to claim 4, characterized in that: The first handle (3-0) also includes a spring slot on the side wall of the first handle assembly cavity (3-04), and one end of the energy storage torsion spring is locked in the spring slot; the second handle body includes a second handle post (3-12) and a second handle base (3-10) that are coaxially arranged at both ends. The outer diameter of the second handle post (3-12) is smaller than the outer diameter of the second handle base (3-10). The second handle post (3-12) is inserted into the middle of the energy storage torsion spring. The circumferential part of the second handle base (3-10) is provided with a spring insertion hole that limits the other end of the energy storage torsion spring.

6. The fast closing mechanism of the circuit breaker according to claim 5, characterized in that: The second handle body also includes a second handle mounting plate (3-13), a second handle column (3-12), a second handle mounting plate (3-13), and a second handle base (3-10) which are coaxially arranged and connected in sequence. The outer diameters of the second handle column (3-12), the second handle mounting plate (3-13), and the second handle mounting plate (3-13) increase in sequence. The energy storage torsion spring is limited between the first handle (3-0) and the second handle mounting plate (3-13).

7. The fast closing mechanism of the circuit breaker according to claim 4, characterized in that: The first handle (3-0) includes a first handle limiting part (3-01) disposed on the circumferential side of the first handle body (3-00), and the second handle (3-1) includes a second handle limiting part (3-11) disposed on the circumferential side of the second handle body. The handle energy storage member (3-3) causes the second handle limiting part (3-11) to be limited and engaged with the first handle limiting part (3-01).

8. The fast closing mechanism of the circuit breaker according to claim 7, characterized in that: The second handle limiting part (3-11) is driven and connected to the transmission mechanism (5) through the second link (4).

9. The fast closing mechanism of the circuit breaker according to claim 4, characterized in that: The first handle (3-0) further includes a first handle drive unit (3-02) disposed on the first handle body (3-00). The first handle drive unit (3-02) drives the handle limiting member (3-2) to rotate, thereby releasing the handle limiting member (3-2) from the limiting engagement with the second handle (3-1).

10. The fast closing mechanism of the circuit breaker according to claim 4, characterized in that: The first handle (3-0) also includes a first handle connecting part (3-03) disposed on the circumferential side of the first handle body (3-00), and the button mechanism (1) is driven connected to the first handle connecting part (3-03) through the first connecting rod (2).

11. The fast closing mechanism of the circuit breaker according to claim 1, characterized in that: The handle limiting member (3-2) is rotatably configured, and the first handle (3-0) drives the handle limiting member (3-2) to rotate so that it releases its limiting engagement with the second handle (3-1); the handle limiting member (3-2) includes a limiting member driven part (3-25) that engages with the first handle (3-0) and a limiting member limiting structure that engages with the second handle (3-1).

12. The fast closing mechanism of the circuit breaker according to claim 11, characterized in that: The second connecting rod (4) passes through the second handle (3-1) to form a connecting rod protrusion. The second handle (3-1) is limited and engaged with the limiting structure through the connecting rod protrusion.

13. The fast closing mechanism of the circuit breaker according to claim 12, characterized in that: The handle limiting member (3-2) also includes a limiting member slot. In the pair of side walls of the limiting member slot, a limiting member limiting part (3-26) is formed on one side wall and a limiting member moving part (3-25) is formed on the other side wall. The limiting member slot includes a slotted bottom surface (3-23) and a slotted limiting surface (3-24) connected in sequence. The slotted limiting surface (3-24) is a limiting member limiting structure that is limited and cooperates with the protruding end of the connecting rod.

14. The fast closing mechanism of the circuit breaker according to claim 1, characterized in that: The closing mechanism (3) also includes a limit member return spring (3-4), which applies a force to the handle limit member (3-2), causing the handle limit member (3-2) to tend to move toward the second handle (3-1).

15. The fast closing mechanism of the circuit breaker according to claim 1, characterized in that: The transmission mechanism (5) includes a lever (5-0), a locking element (5-1), a tripping element (5-2), and a rocker arm (5-3). The lever (5-0) is rotatably mounted on the housing structure of the circuit breaker. The locking element (5-1) and the tripping element (5-2) are rotatably mounted on the lever (5-0) and locked together. One end of the rocker arm (5-3) is rotatably connected to the lever (5-0), and the other end is rotatably connected to the moving contact mechanism (7). The second handle (3-1) of the closing mechanism (3) is drivenly connected to the locking element (5-1) through the second connecting rod (4).

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