Circuit breaker repulsion quick tripping structure and circuit breaker

Abstract

The invention relates to the technical field of low-voltage electric appliances, in particular to a circuit breaker repulsion quick tripping structure and a circuit breaker. The invention provides a breaker repulsion rapid tripping structure. The breaker repulsion rapid tripping structure comprises a rotating shaft, a moving contact assembly, a connecting rod, a connecting rod shaft and a traction rod. The rotating shaft is axially provided with at least one separation cavity, the connecting rod is rotatably connected in the separation cavity through a connecting rod shaft, the connecting rod comprises a hit part and a hitting part, the hit part is correspondingly matched with the moving contact assembly, and the hitting part is correspondingly matched with the driven part of the traction rod; when a large current passes through a circuit breaker loop and an electric repulsive force generated between the moving contact and the static contact repels the moving contact assembly and rotates, the moving contact assembly strikes the struck part so that the struck part drives the connecting rod to rotate along a first direction. Therefore, the striking part strikes the driven part of the draw bar, so that the draw bar rotates to drive the mechanism of the circuit breaker to unlock and complete tripping. The whole transmission path is completely integrated in the rotating shaft, additional intermediate transmission parts are not needed, and response is rapid.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical equipment technology, and in particular to a circuit breaker quick-tripping structure and a circuit breaker. Background Technology

[0002] Circuit breakers are key components in low-voltage power distribution systems used to connect and disconnect circuits and provide overload and short-circuit protection. When a short-circuit fault occurs in a circuit, the circuit breaker must quickly disconnect to protect the lines and equipment. Most existing circuit breaker tripping mechanisms employ electromagnetic or bimetallic thermal principles, triggering the trip lever to unlock the mechanism after sensing the fault current. However, the operation of such structures involves the accumulation of electromagnetic force or thermal deformation, resulting in a long response time. This makes it difficult to achieve rapid disconnection at the initial moment of fault current occurrence, leading to a prolonged arc duration between contacts, easy contact erosion, and weak current-limiting capacity. Furthermore, some improved solutions mount the tripping trigger mechanism on the main shaft of the operating mechanism. While this utilizes electro-repulsive force for triggering, the external structure occupies a large space, has a long transmission path, and still suffers from limitations in improving response speed and low structural integration. Summary of the Invention

[0003] The purpose of this invention is to provide a circuit breaker disconnection fast tripping structure and circuit breaker to solve the technical problems of slow tripping response speed and low structural integration in the prior art.

[0004] In a first aspect, the present invention provides a circuit breaker quick tripping structure, comprising: a rotating shaft, a moving contact assembly, a connecting rod, a connecting rod shaft, and a traction rod; The rotating shaft is provided with at least one cavity along the axial direction, and each cavity is provided with a corresponding moving contact assembly. The moving contact assembly is drivenly connected to the rotating shaft and can rotate synchronously with the rotating shaft. The connecting rod is rotatably connected to the cavity via the connecting rod shaft, and the connecting rod includes a struck part and a striking part. The struck part is correspondingly engaged with the moving contact assembly, and the striking part is correspondingly engaged with the driven part of the traction rod. When a large current passes through the circuit breaker circuit, the electric repulsion force generated between the moving and stationary contacts repels the moving contact assembly, causing it to rotate. The moving contact assembly strikes the struck part, causing the struck part to drive the connecting rod to rotate in the first direction. This causes the striking part to strike the driven part of the traction rod, causing the traction rod to rotate and unlock the circuit breaker mechanism, completing the tripping process.

[0005] In an optional implementation, a reset element is also included; The connecting rod is rotatably connected to the connecting rod shaft, and the connecting rod is connected to the reset member; The reset component is used to drive the connecting rod to rotate and reset in a second direction opposite to the first direction.

[0006] In an optional embodiment, the reset member is a torsion spring, and the connecting rod further includes a reset part, which is disposed on one side of the striking part along the axial direction of the connecting rod shaft; The torsion spring is sleeved on the connecting rod shaft, with one end of the torsion spring connected to the rotating shaft and the other end connected to the reset part.

[0007] In an optional embodiment, a contact spring and a third fixing member are also included, and the third fixing member is disposed on the rotating shaft; The moving contact assembly is provided with a first hanging spring portion, the third fixing member is provided with a second hanging spring portion, one end of the contact spring is connected to the first hanging spring portion, and the other end is connected to the second hanging spring portion; The contact spring is used to provide an elastic force to the moving contact assembly, giving it a tendency to close with the stationary contact assembly.

[0008] In an optional embodiment, along the axial direction of the rotating shaft, a first fixing member and a second fixing member are disposed opposite to each other within the cavity; The first fixing member is provided with a first hole post, and the second fixing member is provided with a second hole post. One end of the connecting rod shaft is inserted into the first hole post, and the other end is inserted into the second hole post.

[0009] In an optional embodiment, a recessed platform is provided at the top of the cavity; The first fixing member, the second fixing member, and the third fixing member are all disposed on the recessed platform; Both the first and second fixing members are provided with slots, and the third fixing member is U-shaped, with its two ends inserted into the slots of the first fixing member and the second fixing member, respectively.

[0010] In an optional embodiment, the rotating shaft is further provided with a limiting part, which corresponds to and cooperates with the struck part to limit the rotation angle of the connecting rod in a second direction opposite to the first direction.

[0011] In an optional embodiment, the moving contact assembly includes at least one main contact and at least one arc contact, wherein the tail of the arc contact is provided with a driving part, and the driving part is L-shaped. The driving part and the struck part cooperate accordingly.

[0012] In an optional embodiment, the link further includes a connecting portion, to which both the struck portion and the striking portion are connected; The connecting part is rotatably connected to the connecting rod shaft.

[0013] In an optional embodiment, an insulating component is also included. A sliding groove is provided on the rotating shaft, and a slider is provided on the insulating component. The slider is inserted into the sliding groove, and a guide groove is provided on the side wall of the sliding groove. A buckle is provided on the slider, and the buckle is inserted into the guide groove. The slider is able to slide within the sliding groove along the guiding direction of the guide groove. The insulating component is provided with a limiting groove and an opening for the moving contact assembly to pass through. The limiting groove is used to limit the repulsion stroke of the arc contact when the arc contact is repelled. The drive unit includes a horizontal section and a vertical section; When the arc contact opens and rotates, the horizontal segment strikes the struck part, driving the connecting rod to rotate. When the connecting rod rotates and drives the traction rod to the mechanism unlock position, the inner side of the horizontal segment contacts the end of the struck part. As the arc contact continues to open, the end of the horizontal segment enters the end hook groove of the struck part until the end of the struck part abuts against the inner side of the vertical segment. The connecting rod remains stationary until then. As the arc contact continues to open, after the end of the struck part abuts against the vertical segment, the arc contact continues to move until it abuts against the limiting groove. The stroke of the arc contact from the end of the struck part abutting against the vertical segment to abutting against the limiting groove is the interference of the connecting rod driving the traction rod to rotate.

[0014] Secondly, the present invention provides a circuit breaker including the circuit breaker quick-tripping structure described in any one of the foregoing embodiments.

[0015] Compared with the prior art, the technical advantages of the circuit breaker disconnection quick tripping structure and the circuit breaker provided by the present invention are as follows: The circuit breaker quick-tripping structure provided by this invention includes: a rotating shaft, a moving contact assembly, a connecting rod, a connecting rod shaft, and a traction rod; the rotating shaft has at least one cavity along its axial direction, and each cavity is correspondingly provided with a moving contact assembly, the moving contact assembly being tractively connected to the rotating shaft and capable of rotating synchronously with the rotating shaft; the connecting rod is rotatably connected to the cavity through the connecting rod shaft, and the connecting rod includes a struck part and a striking part, the struck part correspondingly cooperating with the moving contact assembly, and the striking part correspondingly cooperating with the driven part of the traction rod; when a large current passes through the circuit breaker circuit, the electric repulsion force generated between the moving and stationary contacts repels the moving contact assembly, causing it to rotate, the moving contact assembly strikes the struck part, causing the struck part to drive the connecting rod to rotate in a first direction, thereby causing the striking part to strike the driven part of the traction rod, causing the traction rod to rotate and drive the circuit breaker mechanism to unlock and complete the tripping.

[0016] By rotatably connecting the connecting rod to the cavity of the rotating shaft via the connecting rod shaft, and utilizing the repulsive action of the moving contact assembly under the action of electric repulsion to directly strike the struck part of the connecting rod, the striking part of the connecting rod drives the traction rod to disengage, thus achieving a rapid mechanical transmission at the moment of fault current occurrence. The entire transmission path is fully integrated inside the rotating shaft, eliminating the need for additional intermediate transmission components. This not only results in a compact structure and high space utilization, but also a short transmission chain and rapid response, significantly shortening the total breaking time of the circuit breaker and effectively improving the safety and current limiting capability of the power distribution system.

[0017] The circuit breaker provided by the present invention includes the aforementioned circuit breaker quick-tripping structure. Therefore, the technical advantages and effects achieved by the circuit breaker quick-tripping structure are not described in detail here.

[0018] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a side sectional view of the circuit breaker closing position provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the installation of the connecting rod and the fixing component provided in an embodiment of the present invention; Figure 3 A schematic diagram of the first fastener structure provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the second fastener structure provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the third fastener structure provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the arc contact structure provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the connecting rod structure provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the traction rod structure provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the overall quick-release structure provided in an embodiment of the present invention; Figure 10 This is a schematic diagram of the traction rod and connecting rod cooperation provided in an embodiment of the present invention; Figure 11 This is a schematic diagram illustrating the installation of the moving contact, insulating component, and rotating shaft according to an embodiment of the present invention. Figure 12 This is a schematic diagram showing the position at the end of the first stage of the arc contact repulsion process provided in an embodiment of the present invention; Figure 13 This is a schematic diagram showing the position at the end of the second stage of the arc contact repulsion process provided in an embodiment of the present invention; Figure 14 This is a schematic diagram of one side of the insulating component provided in an embodiment of the present invention; Figure 15 This is a schematic diagram of the other side of the insulating component provided in an embodiment of the present invention.

[0021] Icons: 1-Shaft; 2-Cavity; 3-Moving contact assembly; 4-Main contact; 5-Arc contact; 6-First fixing part; 7-Second fixing part; 8-Connecting rod; 9-Connecting rod shaft; 10-Connecting part; 11-Struck part; 12-Struck part; 13-Traction rod; 14-Driven part; 15-Driven part; 16-Torsion spring; 17-First hole post; 18-Second hole post; 19-Reset part; 20-Contact spring; 21-Third fixing part; 22-First hanging spring part; 23-Second hanging spring part; 24-Sunk; 25-Slot; 26-Limiting part; 27-Stationary contact assembly; 28-Insulator; 29-Slide groove; 30-Opening; 31-Limiting groove; 32-Horizontal section; 33-Vertical section; 34-Isolation part; 35-Slider; 36-Guide groove; 37-Snap-on. Detailed Implementation

[0022] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0026] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0027] The specific structure is as follows: Figures 1 to 15 As shown.

[0028] This embodiment provides a circuit breaker quick-tripping structure, including: a rotating shaft 1, a moving contact assembly 3, a connecting rod 8, a connecting rod shaft 9, and a traction rod 13; the rotating shaft 1 is provided with at least one cavity 2 along the axial direction, and each cavity 2 is provided with a corresponding moving contact assembly 3. The moving contact assembly 3 is tractively connected to the rotating shaft 1 and can rotate synchronously with the rotating shaft 1; the connecting rod 8 is rotatably connected to the cavity 2 through the connecting rod shaft 9, and the connecting rod 8 includes a struck part 11 and a striking part 12. The struck part 11 corresponds to and cooperates with the moving contact assembly 3, and the striking part 12 corresponds to and cooperates with the driven part 14 of the traction rod 13; when a large current passes through the circuit breaker circuit, the electric repulsion force generated between the moving and stationary contacts repels the moving contact assembly 3 and causes it to rotate. The moving contact assembly 3 strikes the struck part 11, causing the struck part 11 to drive the connecting rod 8 to rotate in a first direction, thereby causing the striking part 12 to strike the driven part 14 of the traction rod 13, causing the traction rod 13 to rotate and drive the circuit breaker mechanism to unlock and complete the tripping.

[0029] In this embodiment, by rotatably connecting the connecting rod 8 to the cavity 2 of the rotating shaft 1 via the connecting rod shaft 9, and utilizing the repulsive action of the moving contact assembly 3 under the action of electric repulsion to directly strike the struck part 11 of the connecting rod 8, the striking part 12 of the connecting rod 8 drives the traction rod 13 to disengage, thus realizing a mechanical rapid transmission at the moment of fault current occurrence. The entire transmission path is completely integrated inside the rotating shaft 1, eliminating the need for additional intermediate transmission components. This not only results in a compact structure and high space utilization, but also a short transmission chain and rapid response, significantly shortening the total breaking time of the circuit breaker and effectively improving the safety and current limiting capability of the power distribution system.

[0030] Specifically, the circuit breaker's quick-trip structure includes a rotating shaft 1, a moving contact assembly 3, a connecting rod 8, a connecting rod shaft 9, and a traction rod 13. The rotating shaft 1 is used to transmit the opening and closing actions and has at least one cavity 2 along its axial direction. For a three-phase circuit breaker, three cavities 2 can be provided, and each cavity 2 corresponds to one moving contact assembly 3. The moving contact assembly 3 is drivenly connected to the rotating shaft 1, which can be achieved through shaft-hole fitting or other means, so that the moving contact assembly 3 can rotate synchronously with the rotating shaft 1 to realize the opening and closing operations.

[0031] In this embodiment, the connecting rod 8 is rotatably connected to the cavity 2 via the connecting rod shaft 9. This embodiment provides several implementation methods to achieve the installation of the connecting rod shaft 9. As a preferred embodiment, a first fixing member 6 and a second fixing member 7 are arranged opposite each other within the cavity 2. The first fixing member 6 has a first post hole 17, and the second fixing member 7 has a second post hole 18. One end of the connecting rod shaft 9 is inserted into the first post hole 17, and the other end is inserted into the second post hole 18, thereby mounting the connecting rod shaft 9 between the first fixing member 6 and the second fixing member 7. The connecting rod 8 is rotatably connected to the connecting rod shaft 9. Alternatively, the independent first fixing member 6 and second fixing member 7 may not be provided. Instead, mounting holes or mounting slots are directly opened on the two opposite inner sidewalls of the cavity 2, and both ends of the connecting rod shaft 9 are respectively inserted into or snapped into the mounting holes or mounting slots, thus achieving the same fixed installation of the connecting rod shaft 9 within the cavity 2. Both installation methods allow the connecting rod 8 to be rotatably connected to the cavity 2 via the connecting rod shaft 9.

[0032] In this embodiment, the connecting rod 8 includes a struck part 11 and a striking part 12. The struck part 11 is used to cooperate with the moving contact assembly 3, and the striking part 12 is used to cooperate with the driven part 14 of the traction rod 13. The traction rod 13 is part of the tripping mechanism, and its rotation can drive the circuit breaker mechanism to unlock.

[0033] When a large current (such as a short-circuit current) occurs in the circuit breaker circuit, the electro-repulsive force generated between the moving and stationary contacts overcomes the contact pressure, causing the moving contact assembly 3 to rotate. At this time, the moving contact assembly 3 strikes the struck part 11 of the connecting rod 8, driving the struck part 11 to rotate the connecting rod 8 around the connecting rod shaft 9 in the first direction. As the connecting rod 8 rotates, its striking part 12 swings and strikes the driven part 14 of the traction rod 13, forcing the traction rod 13 to rotate, thereby triggering the tripping mechanism to unlock, and the circuit breaker completes the tripping disconnection. Since this transmission process is directly driven by the repulsive action of the moving contact assembly 3, without the need for electromagnetic or thermal element delay, the response speed is extremely fast.

[0034] In this embodiment, to facilitate accurate striking of the struck portion 11 by the moving contact assembly 3, the moving contact assembly 3 includes at least one main contact 4 and at least one arc contact 5. A driving portion 15 is provided at the tail of the arc contact 5, which is preferably L-shaped to form a stable striking engagement with the struck portion 11. When the moving contact assembly 3 is pushed apart, the driving portion 15 of the arc contact 5 directly strikes the struck portion 11, thus transmitting force. The main contact 4 is used to carry normal operating current, and the arc contact 5 is used to protect the main contact 4 during disconnection.

[0035] In this embodiment, to enable the connecting rod 8 to automatically reset after impact, the circuit breaker's quick-release structure also includes a reset component. The reset component is connected to the connecting rod 8 and drives the connecting rod 8 to rotate and reset in a second direction opposite to the first direction, preparing for the next action. The reset component can be an elastic element such as a torsion spring 16, a tension spring, or a compression spring. As a specific implementation of this embodiment, the reset component uses a torsion spring 16, and the connecting rod 8 also includes a reset part 19. The reset part 19 is located on one side of the impact part 12, and its specific position can be selected according to the spatial layout: it can be located on the side of the impact part 12 facing the first fixing member 6, or on the side of the impact part 12 facing the second fixing member 7. The torsion spring 16 is sleeved on the connecting rod shaft 9, with one end connected to the rotating shaft 1 (e.g., snapped onto or abutting against the wall of the rotating shaft 1), and the other end connected to the reset part 19 (e.g., abutting or fixedly connected). When the connecting rod 8 rotates in the first direction, the torsion spring 16 stores energy; when the moving contact assembly 3 is reset, the torsion spring 16 releases energy and drives the connecting rod 8 to reset in the opposite direction.

[0036] In this embodiment, to provide the contact pressure required for closing the moving contact assembly 3, the circuit breaker's quick-release structure further includes a contact spring 20 and a third fixing member 21. The third fixing member 21 is fixedly mounted on the rotating shaft 1. The moving contact assembly 3 is provided with a first hanging spring portion 22, and the third fixing member 21 is provided with a second hanging spring portion 23. One end of the contact spring 20 is connected to the first hanging spring portion 22, and the other end is connected to the second hanging spring portion 23. The contact spring 20 is used to provide elastic force to the moving contact assembly 3, making it tend to close with the stationary contact assembly 27. When the electric repulsive force generated by the large current exceeds the elastic force of the contact spring 20, the moving contact assembly 3 is repelled. The first hanging spring portion 22 can be in the form of a hook, and the second hanging spring portion 23 can be in the form of a hanging hole for easy assembly. However, it is not limited to this; the first hanging spring portion 22 can also be other structures that can connect to one end of the contact spring 20, and the second hanging spring portion 23 can also be other structures that can connect to one end of the contact spring 20.

[0037] In this embodiment, each main contact 4 and each arc contact 5 in the moving contact assembly 3 is provided with a first hanging spring part 22, and the third fixing member 21 is provided with a second hanging spring part 23 in the same number as the main contact 4 and the arc contact 5. A contact spring 20 is connected between each first hanging spring part 22 and the second hanging spring part 23, so as to provide the moving contact assembly 3 with a larger and more stable contact pressure required for closing.

[0038] In this embodiment, a recessed platform 24 is provided at the top of the cavity 2. The first fixing member 6, the second fixing member 7, and the third fixing member 21 are all disposed on the recessed platform 24. The recessed platform 24 has mounting grooves corresponding to the positions of the first fixing member 6 and the second fixing member 7, and the first fixing member 6 and the second fixing member 7 are respectively fitted into the corresponding mounting grooves to achieve initial positioning. Slots 25 are provided on both the first fixing member 6 and the second fixing member 7. The third fixing member 21 is U-shaped, with its two ends inserted into the slots 25 of the first fixing member 6 and the second fixing member 7, respectively, thereby achieving mutual fixation among the three fixing members. The moving contact assembly 3 is located below the third fixing member 21 to avoid interference. After installation, the contact spring 20 uses its elasticity to ensure that the third fixing member 21 is tightly fitted onto the recessed platform 24, thereby stabilizing the positions of the first fixing member 6 and the second fixing member 7. Ultimately, the first fixing member 6, the second fixing member 7, and the third fixing member 21 are all tightly fitted onto the recessed platform 24 without the need for additional fasteners.

[0039] In this embodiment, to prevent the connecting rod 8 from rotating excessively in the second direction and causing the struck part 11 to deviate from its normal engagement position with the drive part 15, a limiting part 26 is also provided on the rotating shaft 1. The limiting part 26 is correspondingly engaged with the struck part 11. When the connecting rod 8 returns to the predetermined position, the struck part 11 abuts against the limiting part 26, thereby limiting its continued rotation and ensuring that the drive part 15 can accurately strike the struck part 11 during the next drive.

[0040] In this embodiment, the connecting rod 8 further includes a connecting portion 10, to which both the struck portion 11 and the striking portion 12 are connected. The connecting portion 10 is rotatably connected to the connecting rod shaft 9. The connecting portion 10 can be in the form of a sleeve, directly sleeved on the connecting rod shaft 9; or it can be a collar or other rotatable connection structure, as long as it can achieve free rotation around the connecting rod shaft 9.

[0041] In this embodiment, an insulating component 28 is also included. A groove 29 is provided on the rotating shaft 1, and a slider 35 is provided on the insulating component 28. The slider 35 is inserted into the groove 29, and a guide groove 36 is provided on the side wall of the groove. A buckle 37 is provided on the slider and is inserted into the guide groove 36. The slider 35 can slide within the groove 29 along the guiding direction of the guide groove 36. An opening 30 is provided on the insulating component 28 for the moving contact assembly 3 to pass through. The opening 30 is adapted to the cross-sectional shape of the moving contact assembly 3, and the size of the opening 30 is equal to or slightly larger than the cross-sectional size of the moving contact assembly 3, thereby playing an arc-blocking role and preventing the electric arc from entering the cavity 2. The bottom of the opening 30 of the insulating component 28 protrudes forward to form an isolation part 34. The isolation part 34 is located on the lower side of the moving contact assembly 3, which plays a role in isolating the moving contact assembly 3 and the stationary contact assembly 27 to prevent back-side breakdown. The insulating component 28 is also provided with a limiting groove 31, which is used to limit the repulsion stroke of the arc contact 5 when the arc contact 5 is repelled.

[0042] When a short circuit fault occurs, the arc contact 5 is repelled by the electric repulsion force. At this time, the insulating part 28 is pressed down by the lower part of the main contact 4 and remains fixed together with the other main contacts 4. Therefore, the bottom of the limiting groove 31 of the insulating part 28 corresponding to the arc contact 5 naturally becomes the repulsion limit of the arc contact 5. When the arc contact 5 is repelled to the limit position, it abuts against the bottom of the limiting groove 31.

[0043] To further optimize the transmission and engagement, this embodiment features a precise design for the connection between the connecting rod 8 and the drive unit 15. The drive unit 15 includes a horizontal section 32 and a vertical section 33, which are connected in an L-shape. The process of the arc contact 5 repelling and rotating is divided into three stages: The first stage is the unlocking stage. When the arc contact 5 rotates, the transverse segment 32 of the driving part 15 strikes the struck part 11 (i.e., the transverse segment 32 strikes the struck part 11 as...). Figure 1 (As shown, the surface facing the horizontal segment 32), drives the connecting rod 8 to rotate. When the connecting rod 8 rotates, it drives the traction rod 13 to rotate to the unlocked position of the mechanism, and the inner side of the horizontal segment 32 of the driving part 15 comes into contact with the end of the struck part 11 (as shown). Figure 12 As shown), at this point, the trajectory of the horizontal segment 32 continues to move and coincides with the arc surface of the end hook groove of the struck part 11. At this time, the distance between the end of the struck part 11 and the vertical segment 33 of the drive part 15 is recorded as distance A, and the distance between the head of the arc contact 5 and the bottom of the limiting groove 31 of the insulating member 28 is recorded as distance B. Normally, the mechanism is unlocked at this stage.

[0044] The second stage is the idle stroke stage. The arc contact 5 continues to rotate, and the end of the horizontal segment 32 of the drive unit 15 enters the end hook groove of the struck part 11, with the horizontal segment 32 and the end of the struck part 11 moving towards each other. During this process, the distance between the end of the struck part 11 and the vertical segment 33 gradually decreases, but the connecting rod 8 remains stationary until the end of the struck part 11 abuts against the inner side of the vertical segment 33 of the drive unit 15 (e.g., Figure 13 (As shown). During this stage, the distance of relative movement between the transverse segment 32 and the struck part 11 is A. At this time, the connecting rod 8 has not yet rotated, and the arc contact 5 has not yet reached the limiting position of the limiting groove 31.

[0045] The third stage is the interference drive stage. The arc contact 5 continues to rotate, and since the end of the struck part 11 has abutted against the inner side of the vertical section 33, the vertical section 33 begins to drive the struck part 11, causing the connecting rod 8 to continue rotating. The maximum stroke of the arc contact 5 is the difference between B and A (i.e., BA), until the head of the arc contact 5 abuts against the bottom of the limiting groove 31. The stroke from the end of the struck part 11 abutting against the inner side of the vertical section 33 to the arc contact 5 abutting against the limiting groove 31 (i.e., BA) is the interference amount by which the connecting rod 8 drives the traction rod 13. If the mechanism is not unlocked in the first stage, the third stage ensures that the mechanism is unlocked.

[0046] Through the above design, the difference between distance B and distance A (i.e., the interference fit) ensures that the mechanism can unlock before the arc contact 5 reaches the limit position, while preventing the connecting rod 8 from rotating too much and damaging the traction rod 13. This interference fit not only ensures the function of rapid tripping, but also effectively prevents the connecting rod 8 from excessively striking the traction rod 13 and damaging the mechanism, significantly improving the operational reliability and service life of the circuit breaker.

[0047] This embodiment provides a circuit breaker including the aforementioned circuit breaker quick-trip structure. Therefore, the technical advantages and effects achieved by this circuit breaker include those achieved by the aforementioned circuit breaker quick-trip structure, which will not be elaborated here.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A circuit breaker quick-tripping structure, characterized in that, include: Rotating shaft (1), moving contact assembly (3), connecting rod (8), connecting rod shaft (9) and traction rod (13); The rotating shaft (1) is provided with at least one cavity (2) along the axial direction, and each cavity (2) is provided with a corresponding moving contact assembly (3). The moving contact assembly (3) is connected to the rotating shaft (1) and can rotate synchronously with the rotating shaft (1). The connecting rod (8) is rotatably connected to the cavity (2) via the connecting rod shaft (9), and the connecting rod (8) includes a struck part (11) and a striking part (12). The struck part (11) is correspondingly engaged with the moving contact assembly (3), and the striking part (12) is correspondingly engaged with the driven part (14) of the traction rod (13). When a large current passes through the circuit breaker circuit, the electric repulsion force generated between the moving and stationary contacts repels the moving contact assembly (3) and causes it to rotate. The moving contact assembly (3) then strikes the struck part (11), causing the struck part (11) to drive the connecting rod (8) to rotate in the first direction. This causes the striking part (12) to strike the driven part (14) of the traction rod (13), causing the traction rod (13) to rotate and unlock the circuit breaker mechanism to complete the tripping.

2. The circuit breaker quick-tripping structure according to claim 1, characterized in that, It also includes a reset component; The connecting rod (8) is rotatably connected to the connecting rod shaft (9), and the connecting rod (8) is connected to the reset member; The reset component is used to drive the connecting rod (8) to rotate and reset in a second direction opposite to the first direction.

3. The circuit breaker quick-tripping structure according to claim 2, characterized in that, The reset component is a torsion spring (16), and the connecting rod (8) also includes a reset part (19), and along the axial direction of the connecting rod shaft (9), the reset part (19) is disposed on one side of the striking part (12); The torsion spring (16) is sleeved on the connecting rod shaft (9), and one end of the torsion spring (16) is connected to the rotating shaft (1), and the other end is connected to the reset part (19).

4. The circuit breaker quick-tripping structure according to claim 1, characterized in that, It also includes a contact spring (20) and a third fixing member (21), and the third fixing member (21) is disposed on the rotating shaft (1); The moving contact assembly (3) is provided with a first hanging spring part (22), the third fixing member (21) is provided with a second hanging spring part (23), one end of the contact spring (20) is connected to the first hanging spring part (22), and the other end is connected to the second hanging spring part (23). The contact spring (20) is used to provide the moving contact assembly (3) with an elastic force that makes it tend to close with the stationary contact assembly (27).

5. The circuit breaker quick-tripping structure according to claim 4, characterized in that, Along the axial direction of the rotating shaft (1), a first fixing member (6) and a second fixing member (7) are disposed opposite to each other in the cavity (2); The first fixing member (6) is provided with a first hole post (17), and the second fixing member (7) is provided with a second hole post (18). One end of the connecting rod shaft (9) is inserted into the first hole post (17), and the other end is inserted into the second hole post (18).

6. The circuit breaker quick-tripping structure according to claim 5, characterized in that, The top of the cavity (2) is provided with a recessed platform (24). The first fixing member (6), the second fixing member (7) and the third fixing member (21) are all disposed on the sinking platform (24); Both the first fixing member (6) and the second fixing member (7) are provided with slots (25). The third fixing member (21) is U-shaped, and both ends of the third fixing member (21) are respectively inserted into the slots (25) of the first fixing member (6) and the slots (25) of the second fixing member (7).

7. The circuit breaker quick-tripping structure according to any one of claims 1-6, characterized in that, The rotating shaft (1) is also provided with a limiting part (26), which cooperates with the struck part (11) to limit the rotation angle of the connecting rod (8) in a second direction opposite to the first direction.

8. The circuit breaker quick-tripping structure according to any one of claims 1-6, characterized in that, The moving contact assembly (3) includes at least one main contact (4) and at least one arc contact (5), the tail of which is provided with a driving part (15), and the driving part (15) is L-shaped; The driving part (15) and the struck part (11) are correspondingly engaged.

9. The circuit breaker quick-tripping structure according to any one of claims 1-6, characterized in that, The link (8) also includes a connecting part (10), and the struck part (11) and the striking part (12) are both connected to the connecting part (10). The connecting part (10) is rotatably connected to the connecting rod shaft (9).

10. The circuit breaker quick-tripping structure according to claim 8, characterized in that, It also includes an insulating component (28), a sliding groove (29) is provided on the rotating shaft (1), a slider (35) is provided on the insulating component (28), the slider (35) is inserted into the sliding groove (29), a guide groove (36) is provided on the side wall of the sliding groove, a buckle (37) is provided on the slider, the buckle (37) is inserted into the guide groove (36), and the slider (35) can slide in the sliding groove (29) along the guiding direction of the guide groove (36); The insulating member (28) is provided with a limiting groove (31) and an opening (30) through which the moving contact assembly (3) passes. The limiting groove (31) is used to limit the repulsion stroke of the arc contact (5) when the arc contact (5) is repelled. The drive unit (15) includes a horizontal section (32) and a vertical section (33); When the arc contact (5) opens and rotates, the horizontal segment (32) strikes the struck part (11), driving the connecting rod (8) to rotate. When the connecting rod (8) rotates and drives the traction rod (13) to the mechanism unlock position, the inner side of the horizontal segment (32) contacts the end of the struck part (11). During the continued opening process of the arc contact (5), the end of the horizontal segment (32) enters the end hook groove of the struck part (11) until the end of the struck part (11) is in contact with the end of the traction rod (13). Before the inner side of the vertical section (33) abuts, the connecting rod (8) remains stationary. During the process of the arc contact (5) continuing to push away, after the end of the struck part (11) abuts with the vertical section (33), the arc contact (5) continues to move until it abuts with the limiting groove (31). The stroke of the arc contact (5) from the end of the struck part (11) abutting with the vertical section (33) to abutting with the limiting groove (31) is the interference of the connecting rod (8) driving the traction rod (13) to rotate.

11. A circuit breaker, characterized in that, Includes the circuit breaker quick-trip structure according to any one of claims 1-10.

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