Dual-mechanism movable contact opening and closing operating mechanism of circuit breaker

Abstract

The utility model relates to a double mechanism movable contactor opening and closing operation mechanism of circuit breaker, including casing, phase pole and N pole contactor subassembly. N pole subassembly contains: N pole contactor seat, N pole movable contactor, the middle part of lever piece is connected casing through rotating shaft, and the upper end is hinged with phase pole contactor seat through the linkage axle that passes through the movable hole of isolation board, and the both ends of linkage rod are respectively hinged with the lower end of lever piece and the upper end of N pole contactor seat, and the one end of compression type reset spring is resisted casing fixed point, and the other end is resisted the spring limiting post of N pole contactor seat. When closing: handle drives phase pole contactor seat, linkage axle pushes lever piece and swings around rotating shaft, linkage rod pushes N pole contactor seat and rotates and compresses reset spring and stores energy, and N pole movable contactor contacts static contactor, when opening: linkage axle drives lever piece and swings reversely, and linkage rod pulls N pole contactor seat and resets. The utility model lever-linkage rod transmission and transverse compression spring layout save space, and still can guarantee higher rated current demand of 63A and above in compact circuit breaker.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a dual-mechanism moving contact opening and closing operation mechanism 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 products, when the N pole needs integrated contact protection (i.e., having both moving and stationary N pole contacts capable of switching), 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 demands 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 utility model is to overcome the shortcomings and deficiencies of the existing technology and to provide a dual-mechanism moving contact opening and closing operation mechanism for a circuit breaker.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a dual-mechanism moving contact opening and closing operation mechanism for a circuit breaker, comprising a housing, a phase contact assembly, and an N-pole contact assembly. The phase contact assembly and the N-pole contact assembly 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; a lever, the middle of which is rotatably connected to the housing via a rotating shaft, and its upper end pivotally connected to the phase contact seat via a linkage shaft passing through the isolation plate. The isolation plate is provided with a movable hole for the linkage shaft to swing; and a linkage rod, the first of which... One end is pivotally connected to the lower end of the lever, and the second end is pivotally connected to the upper end of the N-pole contact seat; the return spring is a compression spring, one end of which abuts against a fixed point on the housing, and the other end abuts against a spring limiting post set on the N-pole contact seat; wherein, when the operating handle performs the closing action, the linkage shaft drives the lever to swing around the rotation axis, driving the linkage rod to push the N-pole contact seat to rotate, compressing the return spring to store energy, 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, driving the linkage rod to pull the N-pole contact seat to reset, and the return spring releases the compression potential energy to push the N-pole contact seat to accelerate rotation, so that the N-pole moving contact separates from the N-pole stationary contact.

[0005] As a preferred embodiment of this utility model, the N-pole contact base is provided with a boss, and the N-pole moving contact is provided with a socket that matches the shape of the boss, with the boss and the socket being fitted with a clearance.

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

[0007] As a preferred embodiment of this utility model, the isolation plate is provided with a mounting protrusion on the side facing the N-pole contact seat, and the mounting protrusion is provided with a mounting groove for one end of the reset spring to be inserted.

[0008] As a preferred embodiment of this invention, the rotating shaft is fitted with a metal sleeve.

[0009] As a preferred embodiment of the present invention, the lever component includes two symmetrically spaced lever plates, one end of the linkage shaft passes between the two lever plates, and the first end of the linkage rod is located between the two lever plates and pivotally connected to the lever plates by rivets.

[0010] As a preferred technical solution 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 pivotally connected thereto.

[0011] 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 tension spring is connected to the side of the phase contact seat near the reset spring. One end of the tension spring is connected to a fixed point on the housing, and the other 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 to 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.

[0012] In summary, the beneficial effects of this utility model are as follows: For compact 3P+N circuit breakers, this application innovatively designs a dual-mechanism linkage operation mechanism, which links the N-pole contact assembly and the phase contact assembly through a linkage shaft, achieving N-pole contact protection within the limit width. The N-pole contact assembly and the phase contact assembly are separated by an isolation plate, and both share a common inner wall. Furthermore, with the cooperation of a lever-linkage rod two-stage transmission and a return spring, the N-pole contact assembly and the phase assembly can coexist efficiently within a 54mm wide housing without reducing the size of other components, and can still guarantee higher rated current requirements of 63A and above within a compact circuit breaker. Attached Figure Description

[0013] 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 2 This 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.

[0014] 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. Return spring; 15. Boss; 16. Insertion hole; 17. Mounting protrusion; 18. First strip hole; 19. Second strip hole; 20. Limiting pin; 21. Metal sleeve; 22. Lever plate; 23. Fixing groove; 24. Jumper buckle; 25. Lock buckle; 26. Connecting shaft; 27. Tension spring; 28. Mounting hole; 29. ​​U-shaped connecting rod; 30. Arc groove; 31. N-pole stationary contact; 32. Spring limiting post; 33. Mounting groove. Detailed Implementation

[0015] 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.

[0016] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0017] like Figure 1-6The circuit breaker shown has a dual-mechanism moving contact opening and closing operating mechanism, including a housing 1, a phase contact assembly 2, and an N-pole contact assembly 3. The phase contact assembly 2 and the N-pole contact assembly 3 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 its upper end is pivotally connected to the phase contact seat 5 via a linkage shaft 11 passing through the isolation plate 4. 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 pivotally connected to the lower end of the lever 9, and the second end of which is pivotally connected to the upper end of the N-pole contact seat 7; and a reset spring. Spring 14 is a compression spring, with one end abutting against a fixed point on the housing 1 and the other end abutting against a spring limiting post 32 set on 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 shaft 10, which drives the linkage rod 13 to push the N-pole contact seat 7 to rotate, compressing the reset spring 14 to store energy, 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, which drives the linkage rod 13 to pull the N-pole contact seat 7 to reset. The reset spring 14 releases the compression potential energy to push the N-pole contact seat 7 to accelerate rotation, so that the N-pole moving contact 8 separates from the N-pole stationary contact 31. In this embodiment, the rotation 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 rotation shaft 10 during the rotation of the lever 9.

[0018] For compact 3P+N circuit breakers, this application innovatively designs a dual-mechanism linkage operation mechanism. The N-pole contact assembly 3 and the phase contact assembly 2 are linked through the linkage shaft 11, achieving N-pole contact protection within the limit width. The N-pole contact assembly 3 and the phase contact assembly 2 are separated by the isolation plate 4 and share an inner wall. In addition, with the two-stage transmission of lever 9-linkage rod 13 and the transverse arrangement of return spring 14, the N-pole contact assembly 3 and the phase assembly can coexist efficiently in a 54mm wide housing 1 without reducing the size of other components. It can still guarantee the higher rated current requirement of 63A and above in a compact circuit breaker.

[0019] 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 and the socket 16 are fitted with a clearance.

[0020] The N-pole contact seat 7 has a first arc-shaped hole in the middle, and the N-pole moving contact 8 has a second arc-shaped hole. The isolation plate 4 has a limiting pin 20 that passes through both the first arc-shaped hole and the second arc-shaped hole.

[0021] The isolation plate 4 has a mounting protrusion 17 on the side facing the N pole contact seat 7, and the mounting protrusion 17 has a mounting groove 33 for one end of the reset spring 14 to be inserted.

[0022] 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. The first end of the linkage rod 13 is located between the two lever plates 22 and is pivotally connected to the lever plate 22 by a rivet. 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 pivotally connected to it. In this embodiment, the lever component 9 is a two-piece folded structure. The linkage rod 13 is located in the middle of the two pieces. The central setting 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 the central position, which makes the force on the N-pole contact seat 7 more balanced.

[0023] 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 tension spring 27 is connected to the side of the phase contact seat 5 near the return spring 14. One end of the tension spring 27 is connected to a fixed point on the housing 1, and the other 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 end of the jumper 24 away from the linkage shaft 11 is linked to the handle 6 via a U-shaped connecting rod 29. The phase contact... The seat 5 has an arc-shaped groove 30. The jump buckle 24 has a protrusion that is slidably connected to the arc-shaped groove 30 on the side facing the phase contact seat 5. The latch 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 may be a torsion spring, spring, tension spring 27, etc., which is prior art), so that the protrusion abuts against one end of the arc-shaped groove 30. When the latch 25 is released, the protrusion can move along the arc-shaped groove 30. This application does not elaborate on the working principle of the latch 25 being released, which is prior art.

[0024] 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, pushing the linkage rod 13 to move to the left. The linkage rod 13 drives the N-pole contact seat 7 to rotate counterclockwise around the limit pin 20. At first, the left side of the two strip holes rotates along the shaft 1. When the N-pole moving contact 8 contacts the N-pole stationary contact 31, the limit pin 20 moves to the right relative to the strip hole, providing overtravel for the contact until the product is completely closed. The return spring 14 is compressed to provide final pressure to the N-pole moving contact 8. Furthermore, the opening distance of the N-pole moving contact 8 is smaller than that of the L-pole (at the phase contact assembly 2), which can realize the N-pole moving contact 8 closing first and then opening, reducing damage to the N-pole moving contact 8 when the product breaks. 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 limit pin 20 moves to the left relative to the two strip holes. When the phase moving contact of the phase contact assembly 2 separates, the N moving contact 8 rotates clockwise around the limit pin 20 until the product is completely disconnected. At this time, the reset spring 14 is released to provide an accelerating force for the N moving contact 8 to disconnect.

[0025] 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 moving contact opening and closing operation mechanism for a circuit breaker, comprising a housing (1), a phase contact assembly (2), and an N-pole contact assembly (3), wherein the phase contact assembly (2) and the N-pole contact assembly (3) are separated by an isolation plate (4) within the housing (1), and 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 its upper end is pivotally connected to the phase contact seat (5) via a linkage shaft (11) passing through the isolation plate (4), the isolation plate (4) having a movable hole (12) for the linkage shaft (11) to swing; a linkage rod (13), the first end of which is pivotally connected to the lower end of the lever (9), and the second end of which is pivotally connected to the upper end of the N-pole contact seat (7); and a return spring (14), which is a compression spring, one end of which abuts against a fixed point of the housing (1), and the other end abuts against... A spring limiting post (32) 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), which drives the linkage rod (13) to push the N-pole contact seat (7) to rotate, compressing the reset spring (14) to store energy, 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, which drives the linkage rod (13) to pull the N-pole contact seat (7) to reset, and the reset spring (14) releases the compression potential energy to push the N-pole contact seat (7) to accelerate rotation, so that the N-pole moving contact (8) separates from the N-pole stationary contact (31).

2. The dual-mechanism moving contact opening and closing operation mechanism of the 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) and the socket (16) are in clearance fit.

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

4. The dual-mechanism moving contact opening and closing operation mechanism of the circuit breaker according to claim 1, characterized in that: The isolation plate (4) is provided with a mounting protrusion (17) on the side facing the N pole contact seat (7), and the mounting protrusion (17) is provided with a mounting groove (33) for one end of the reset spring (14) to be inserted.

5. The dual-mechanism moving contact opening and closing operation mechanism of the circuit breaker according to claim 1, characterized in that: The rotating shaft (10) is fitted with a metal sleeve (21).

6. The dual-mechanism moving contact opening and closing operation mechanism of the circuit breaker according to claim 1, characterized in that: 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 pivotally connected to the lever plates (22) by rivets.

7. The dual-mechanism moving contact opening and closing operation mechanism of the circuit breaker according to claim 6, characterized in that: 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 pivotally connected to it.

8. The dual-mechanism moving contact opening and closing operation mechanism of the circuit breaker according to claim 1, characterized in that: The phase contact assembly (2) also includes a jumper (24) and a lock (25). The middle part of the phase contact seat (5) is rotatably mounted on the housing (1) via a connecting shaft (26). A tension spring (27) is connected to the side of the phase contact seat (5) near the return spring (14). One end of the tension spring (27) is connected to the fixing point of the housing (1), and the other 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) and is connected to the phase contact seat (5). The end of the jumper (24) away from the linkage shaft (11) is linked to the handle (6) via a U-shaped connecting rod (29). An arc groove (30) is provided on the phase contact seat (5). A protrusion that is slidably connected in the arc groove (30) is provided on the side of the jumper (24) facing the phase contact seat (5). The latch (25) is rotatably mounted on the connecting shaft (26) and presses against the jumper (24) through the elastic reset member, so that the protrusion abuts against one end of the arc groove (30); when the latch (25) is released, the protrusion can move along the arc groove (30).

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