A dual-mechanism linkage device for a circuit breaker

Abstract

This utility model relates to a dual-mechanism linkage device for a circuit breaker, which constitutes a high-efficiency transmission system through a lever, a linkage rod, and a first tension spring. The upper end of the lever is hinged to the phase contact seat via a linkage shaft within a movable hole in an isolation plate. During closing, the phase handle drives the linkage shaft to swing the lever, and the linkage rod overcomes the tension of the first tension spring to pull the N-pole contact seat to rotate, achieving reliable contact between the N-pole moving and stationary contacts. During opening, the linkage rod pushes the N-pole contact seat back to its original position, and the first tension spring releases energy to accelerate the disconnection. This utility model links the N-pole contact assembly and the phase contact assembly through the linkage shaft. The phase contact assembly and the N-pole contact assembly share a common inner wall, saving space and eliminating the need to reduce the size of other components. While integrating the N-pole contact protection function, it meets the higher rated current requirements of 63A and above, and ensures synchronous and reliable linkage between the N-pole and the phase poles.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a dual-mechanism linkage device for a circuit breaker. Background Technology

[0002] In compact circuit breaker design, space constraints are a key bottleneck for performance improvement. In existing 54mm wide 3P+N circuit breaker products, when the N pole needs to integrate contact protection functions (i.e., possessing both on / off N pole moving and stationary contacts), its operating mechanism is often complex and occupies a large space. This space requirement directly restricts the product's rated current capability, making it difficult to meet higher rated current requirements of 63A and above. Simultaneously, to ensure synchronous and reliable opening and closing of the N pole contacts and phase contacts, an effective linkage device is required. Therefore, an innovative N pole contact operating mechanism and linkage structure are urgently needed. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a dual-mechanism linkage device for circuit breakers.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a dual-mechanism linkage device for a circuit breaker, comprising a housing, a phase contact assembly, and an N-pole contact assembly, which are separated by an isolation plate inside the housing. The phase contact assembly includes a phase contact seat rotatably mounted on the housing and a handle linked thereto. The N-pole contact assembly includes: an N-pole contact seat rotatably mounted on the housing; an N-pole moving contact connected to the N-pole contact seat; and a lever, the middle part of which is rotatably connected to the housing via a rotating shaft, and the upper end of which is hinged to the phase contact seat via a linkage shaft passing through the isolation plate. The isolation plate is provided with a mechanism for the linkage shaft to swing. The circuit includes: a movable hole; a linkage rod, the first end of which is hinged to the lower end of the lever and the second end of which is hinged to the upper end of the N-pole contact seat; a first tension spring, the first end of which is connected to the housing fixing point and the second end of which is connected to the N-pole contact seat; when the operating handle performs the closing action: the linkage shaft drives the lever to swing around the rotation axis, which pulls the N-pole contact seat to rotate via the linkage rod and overcomes the tension of the first tension spring, so that the N-pole moving contact contacts the N-pole stationary contact; when the operating handle performs the opening action: the linkage shaft drives the lever to swing in the opposite direction, the linkage rod pushes the N-pole contact seat to reset, the N-pole moving contact separates from the N-pole stationary contact, and the first tension spring releases energy to accelerate the disconnection.

[0005] As a preferred technical solution of this utility model, the N-pole contact seat is provided with a boss, and the N-pole moving contact is provided with a socket adapted to the shape of the boss. The boss is inserted into the socket, and a gap is reserved on the side of the socket facing the first tension spring to form a hanging hole space. The second end of the first tension spring is hooked into the hanging hole space.

[0006] As a preferred embodiment of this utility model, the N-pole contact seat has a first strip hole in the middle, the N-pole moving contact has a second strip hole, and the isolation plate has a pin that passes through both the first and second strip holes.

[0007] As a preferred embodiment of this invention, the rotating shaft is fitted with a metal sleeve.

[0008] As a preferred embodiment of the present invention, the lever component includes two symmetrically spaced lever plates, one end of the linkage shaft passes through the two lever plates, and the first end of the linkage rod is located between the two lever plates and is hinged by rivets.

[0009] As a preferred embodiment of this utility model, the side of the N-pole contact seat is provided with a fixing groove, and the second end of the linkage rod is embedded in the fixing groove and hinged thereto.

[0010] As a preferred embodiment of this utility model, the phase contact assembly further includes a jumper and a locking buckle. The middle part of the phase contact seat is rotatably mounted on the housing via a connecting shaft. A second tension spring is connected to the side of the phase contact seat away from the first tension spring. The first end of the second tension spring is connected to a fixed point on the housing, and the second end is connected to the phase contact seat. The linkage shaft is located above the connecting shaft and passes through the mounting hole on the jumper and is connected to the phase contact seat. The end of the jumper away from the linkage shaft is linked to the handle via a U-shaped connecting rod. An arc-shaped groove is provided on the phase contact seat. A protrusion is slidably connected in the arc-shaped groove on the side of the jumper facing the phase contact seat. The locking buckle is rotatably mounted on the connecting shaft and presses against the jumper by an elastic reset member, so that the protrusion abuts against one end of the arc-shaped groove. When the locking buckle is released, the protrusion can move along the arc-shaped groove.

[0011] In summary, the beneficial effects of this utility model are as follows: It adopts a lever-linkage rod transmission structure (the lever is hinged to the housing in the middle, and the linkage rod is hinged at both ends), replacing the traditional direct-drive linkage mechanism. Furthermore, the N-pole operating mechanism is linked to the phase contact assembly via a linkage shaft. The linkage shaft passes through the movable hole of the isolation plate, achieving efficient cross-zone transmission of phase and N-pole movement. Both share a single inner wall (i.e., the isolation plate), avoiding additional space occupation in the N-pole cavity. Compared to traditional circuit breakers, there is no need to reduce the size of other components. Simultaneously, it achieves N-pole contact protection, significantly improving product performance and reliability. Even after integrating the N-pole moving / stationary contacts, the conductor cross-sectional area of ​​the 3P+N circuit breaker can still meet the 63A rated current requirement. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the internal structure of the N-pole contact assembly in the open state of the circuit breaker of this utility model; Figure 2This is a schematic diagram of the internal structure of the N-pole contact assembly in the closed state of the circuit breaker of this utility model; Figure 3 This is a schematic diagram of the phase contact assembly in the circuit breaker of this utility model; Figure 4 This is a schematic diagram of the structure of the N-pole contact assembly in this utility model; Figure 5 This is a schematic diagram of the structure of the lever component and the phase contact seat in this utility model. Figure 6 This is a schematic diagram of the structure of the N-pole contact seat in this utility model.

[0013] Reference numerals: 1. Housing; 2. Phase contact assembly; 3. N-pole contact assembly; 4. Isolation plate; 5. Phase contact seat; 6. Handle; 7. N-pole contact seat; 8. N-pole moving contact; 9. Lever; 10. Rotating shaft; 11. Linkage shaft; 12. Movable hole; 13. Linkage rod; 14. First tension spring; 15. Boss; 16. Insertion hole; 17. Hanging hole space; 18. First strip hole; 19. Second strip hole; 20. Pin; 21. Metal sleeve; 22. Lever plate; 23. Fixing groove; 24. Jumper buckle; 25. Lock buckle; 26. Connecting shaft; 27. Second tension spring; 28. Mounting hole; 29. ​​U-shaped connecting rod; 30. Arc groove; 31. N-pole stationary contact. Detailed Implementation

[0014] To make the technical means, creative features, and achieved objectives and effects of this utility model easier to understand, the present utility model is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are merely preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described in the implementation plan without creative effort are all within the protection scope of this utility model.

[0015] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0016] like Figure 1-6The circuit breaker shown includes a dual-mechanism linkage device, comprising a housing 1, a phase contact assembly 2, and an N-pole contact assembly 3, which are separated by an isolation plate 4 inside the housing 1. The phase contact assembly 2 includes a phase contact seat 5 rotatably mounted on the housing 1 and a handle 6 linked thereto. The N-pole contact assembly 3 includes: an N-pole contact seat 7 rotatably mounted on the housing 1; an N-pole moving contact 8 connected to the N-pole contact seat 7; a lever 9, the middle part of which is rotatably connected to the housing 1 via a rotating shaft 10, and the upper end of which is hinged to the phase contact seat 5 via a linkage shaft 11 passing through the isolation plate 4, and the isolation plate 4 is provided with a movable hole 12 for the linkage shaft 11 to swing; a linkage rod 13, the first end of which is hinged to the lower end of the lever 9, and the second end of which is hinged to the upper end of the N-pole contact seat 7; and a first tension spring 14, the first end of which is connected to a fixed point on the housing 1, and the second end of which is connected to the N-pole contact seat. 7; When the operating handle 6 performs the closing action: the linkage shaft 11 drives the lever 9 to swing around the rotating shaft 10, which pulls the N-pole contact seat 7 to rotate via the linkage rod 13 and overcomes the tension of the first tension spring 14, so that the N-pole moving contact 8 contacts the N-pole stationary contact 31; When the operating handle 6 performs the opening action: the linkage shaft 11 drives the lever 9 to swing in the opposite direction, the linkage rod 13 pushes the N-pole contact seat 7 to reset, the N-pole moving contact 8 separates from the N-pole stationary contact 31, and the first tension spring 14 releases energy to accelerate the disconnection. In this embodiment, the rotating shaft 10 is fitted with a metal sleeve 21, preferably made of copper, iron, aluminum or other metal materials, which increases the strength and life of the rotating shaft 10 during the rotation of the lever 9. The main purpose of this application is to link the N-pole contact assembly 3 with the phase contact assembly 2. The working principle of the rest of the circuit breaker is not specifically described in this application, as this is prior art.

[0017] The transmission structure of lever 9-linkage rod 13 (lever 9 is hinged to housing 1 in the middle, and linkage rod 13 is hinged at both ends) is adopted to replace the traditional direct-drive linkage mechanism. The N-pole operating mechanism is linked to the phase pole contact assembly 2 through linkage shaft 11. The linkage shaft 11 passes through the movable hole 12 of the isolation plate 4 to realize the efficient cross-zone transmission of phase pole and N-pole movement. The two share an inner wall (i.e., isolation plate 4) to avoid occupying additional N-pole cavity space. Compared with traditional circuit breakers, there is no need to reduce the size of other components. At the same time, the N-pole contact protection function is realized, which significantly improves product performance and reliability. After integrating the N-pole moving / stationary contacts, the conductor cross-sectional area of ​​the 3P+N circuit breaker can still meet the 63A rated current requirement.

[0018] The N-pole contact base 7 is provided with a boss 15, and the N-pole moving contact 8 is provided with a socket 16 that matches the shape of the boss 15. The boss 15 is inserted into the socket 16, and a gap is reserved on the side of the socket 16 facing the first tension spring 14 to form a hanging hole space 17. The second end of the first tension spring 14 is hooked into the hanging hole space 17.

[0019] The N-pole contact base 7 has a first strip hole 18 in the middle, the N-pole moving contact 8 has a second strip hole 19, and the isolation plate 4 has a pin 20 that passes through both the first strip hole 18 and the second strip hole 19.

[0020] The lever component 9 includes two symmetrically spaced lever plates 22. One end of the linkage shaft 11 passes between the two lever plates 22, and the first end of the linkage rod 13 is located between the two lever plates 22 and is hinged by rivets. The side of the N-pole contact seat 7 is provided with a fixing groove 23. The second end of the linkage rod 13 is embedded in the fixing groove 23 and hinged thereto. The lever component 9 is a two-piece folding type, and the linkage rod 13 is located in the middle of the two pieces. The central positioning makes the force on the linkage rod 13 more balanced. Similarly, the fixing groove 23 in the N-pole contact seat 7 is also in a central position, which makes the force on the N-pole contact seat 7 more balanced.

[0021] The phase contact assembly 2 also includes a jumper 24 and a latch 25. The phase contact seat 5 is rotatably mounted on the housing 1 via a connecting shaft 26. A second tension spring 27 is connected to the side of the phase contact seat 5 away from the first tension spring 14. The first end of the second tension spring 27 is connected to a fixing point on the housing 1 (providing a mounting position for the second tension spring 27, not limited to a specific structure, this is a conventional design), and the second end is connected to the phase contact seat 5. The linkage shaft 11 is located above the connecting shaft 26 and passes through the mounting hole 28 on the jumper 24 to connect with the phase contact seat 5. The jumper 24 is located away from the linkage shaft 11. The end is linked to the handle 6 via a U-shaped connecting rod 29. An arc-shaped groove 30 is provided on the phase contact seat 5. The jump buckle 24 has a protrusion that is slidably connected in the arc-shaped groove 30 on the side facing the phase contact seat 5. The lock buckle 25 is rotatably mounted on the connecting shaft 26 and presses against the jump buckle 24 through an elastic reset member (not shown in the figure, which can be a torsion spring, spring, tension spring, etc., which is the prior art), so that the protrusion abuts against one end of the arc-shaped groove 30. When the lock buckle 25 is released, the protrusion can move along the arc-shaped groove 30. This application does not elaborate on the working principle of the lock buckle 25 being released, which is the prior art.

[0022] Working principle: During the closing process of the product, the phase contact assembly 2 moves, the phase contact seat 5 rotates, and the linkage shaft 11 set above drives the lever 9 to rotate clockwise around the rotation shaft 10 through the movable hole 12 of the isolation plate 4. The linkage rod 13 is pulled to the left, and the linkage rod 13 drives the N-pole contact seat 7 to rotate counterclockwise around the pin 20. At first, the pin 20 rotates to the left relative to the two strip holes. When the N-pole moving contact 8 contacts the N-pole stationary contact 31, the two strip holes move to the left relative to the pin 20, providing overtravel for the contact until the product is completely closed. At this time, the first tension spring 14 provides the final pressure for the N-pole moving contact 8, and the opening distance of the N-pole contact is smaller than that of the L-pole (at the phase contact assembly 2), which can realize that the N-pole moving contact 8 closes first and then opens. When the product breaks, the damage to the N-pole moving contact 8 is reduced. When the product is disconnected, the phase contact seat 5 resets, causing the lever 9 to rotate counterclockwise around the rotating shaft 10, and simultaneously causing the N contact seat 7 to reset. The two strip holes move to the right relative to the pin 20. After the contacts (phase contact group) separate, the N contact seat 7 rotates clockwise around the pin 20 until the product is completely disconnected. At this time, the first tension spring 14 provides an accelerating force for the N moving contact 8 to disconnect.

[0023] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the utility model as defined by the appended claims and their equivalents.

Claims

1. A dual-mechanism linkage device for a circuit breaker, comprising a housing (1), a phase contact assembly (2), and an N-pole contact assembly (3), the two being separated by an isolation plate (4) within the housing (1), wherein the phase contact assembly (2) comprises a phase contact seat (5) rotatably mounted on the housing (1) and a handle (6) linked thereto, characterized in that: The N-pole contact assembly (3) includes: an N-pole contact seat (7) rotatably mounted on the housing (1); an N-pole moving contact (8) connected to the N-pole contact seat (7); a lever (9), the middle part of which is rotatably connected to the housing (1) via a rotating shaft (10), and the upper end of which is hinged to the phase contact seat (5) via a linkage shaft (11) passing through the isolation plate (4), and the isolation plate (4) is provided with a movable hole (12) for the linkage shaft (11) to swing; a linkage rod (13), the first end of which is hinged to the lower end of the lever (9), and the second end of which is hinged to the upper end of the N-pole contact seat (7); and a first tension spring (14), the first end of which is connected to the fixing point of the housing (1). The second end is connected to the N-pole contact seat (7); when the operating handle (6) performs the closing action: the linkage shaft (11) drives the lever (9) to swing around the rotation axis (10), and pulls the N-pole contact seat (7) to rotate through the linkage rod (13) and overcomes the tension of the first tension spring (14), so that the N-pole moving contact (8) contacts the N-pole stationary contact (31); when the operating handle (6) performs the opening action: the linkage shaft (11) drives the lever (9) to swing in the opposite direction, the linkage rod (13) pushes the N-pole contact seat (7) to reset, the N-pole moving contact (8) separates from the N-pole stationary contact (31), and the first tension spring (14) releases energy to accelerate the disconnection.

2. The dual-mechanism linkage device for a circuit breaker according to claim 1, characterized in that: The N-pole contact base (7) is provided with a boss (15), and the N-pole moving contact (8) is provided with a socket (16) that matches the shape of the boss (15). The boss (15) is inserted into the socket (16), and a gap is reserved on the side of the socket (16) facing the first tension spring (14) to form a hanging hole space (17). The second end of the first tension spring (14) is hooked into the hanging hole space (17).

3. The dual mechanism linkage of a circuit breaker according to claim 1 or 2, characterized in that: The N-pole contact seat (7) has a first strip hole (18) in the middle, the N-pole moving contact (8) has a second strip hole (19), and the isolation plate (4) has a pin (20) that passes through both the first strip hole (18) and the second strip hole (19).

4. The dual mechanism linkage of a circuit breaker of claim 1, wherein: The rotating shaft (10) is fitted with a metal sleeve (21).

5. The dual mechanism linkage of a circuit breaker of claim 1, wherein: The lever (9) includes two symmetrical and spaced lever plates (22), one end of the linkage shaft (11) passes between the two lever plates (22), and the first end of the linkage rod (13) is located between the two lever plates (22) and is hinged by rivets.

6. The dual mechanism linkage of a circuit breaker of claim 5, wherein: The N-pole contact seat (7) has a fixing groove (23) on its side, and the second end of the linkage rod (13) is embedded in the fixing groove (23) and hinged thereto.

7. The dual mechanism linkage of a circuit breaker of claim 1, wherein: The phase contact assembly (2) further includes a jumper (24) and a latch (25). The phase contact seat (5) is rotatably mounted on the housing (1) via a connecting shaft (26) in the middle. A second tension spring (27) is connected to the side of the phase contact seat (5) away from the first tension spring (14). The first end of the second tension spring (27) is connected to a fixing point on the housing (1), and the second end is connected to the phase contact seat (5). The linkage shaft (11) is located above the connecting shaft (26) and passes through the mounting hole (28) on the jumper (24) to connect with the phase contact seat (5). Next, the end of the jump buckle (24) away from the linkage shaft (11) is linked to the handle (6) through the U-shaped connecting rod (29). The phase contact seat (5) is provided with an arc groove (30). The side of the jump buckle (24) facing the phase contact seat (5) is provided with a protrusion that is slidably connected in the arc groove (30). The lock (25) is rotatably installed on the connecting shaft (26) and presses against the jump buckle (24) through the elastic reset member, so that the protrusion abuts against one end of the arc groove (30). When the lock (25) is released, the protrusion can move along the arc groove (30).

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