Miniature circuit breaker with anti-rebound structure

Abstract

The invention belongs to the technical field of circuit breakers, and particularly relates to a miniature circuit breaker with an anti-rebound structure. The circuit breaker comprises a shell, a static contact piece, a movable contact piece and an arc extinguish chamber, and further comprises a driving frame used for controlling closing or opening of the static contact piece and the movable contact piece, and an operating rod is arranged on the driving frame; a first connecting rod is rotationally connected between the torsion seat and the driving frame, a supporting plate is fixedly connected to the static contact piece, and a second connecting rod is rotationally connected between the torsion seat and the supporting plate; the torsion seat is provided with a jumping rod clamped with the lock frame, and the lock frame is connected with a first tension spring; an ejector rod is connected in the electromagnetic solenoid; the anti-bounce mechanism is used for preventing the moving contact from bouncing after opening, and the anti-bounce mechanism is connected with the driving frame; the anti-rebound mechanism is arranged, the anti-rebound mechanism is provided with the ratchet wheel and the pawl, the driving frame drives the ratchet wheel to rotate in the opening process, the ratchet wheel is limited through the pawl, reverse rotation of the ratchet wheel is avoided, and therefore rebound of the movable contact piece is avoided.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, and in particular to a miniature circuit breaker with an anti-rebound structure. Background Technology

[0002] A circuit breaker is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions, and capable of closing, carrying, and interrupting current under abnormal circuit conditions within a specified time. The function of a circuit breaker is to disconnect and connect load circuits, as well as to disconnect faulty circuits, prevent the escalation of accidents, and ensure safe operation. A circuit breaker generally consists of a contact system, an arc-extinguishing system, an operating mechanism, a trip unit, and a casing.

[0003] Existing vacuum circuit breaker mechanisms use rigid tripping limits. However, when the circuit breaker stroke is small and the opening distance is small, the circuit breaker tripping speed is required to achieve reliable tripping. At this time, if the mechanism still uses a rigid limit device, the circuit breaker will have a large rebound amplitude when tripping, which will cause the circuit breaker to arc or re-break down. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a miniature circuit breaker with an anti-rebound structure. By incorporating an anti-rebound mechanism, the rebound amplitude of the moving contact can be reduced, preventing arcing and heavy strikes, thus overcoming the deficiencies of existing technologies and aiming to solve the problems in the background art.

[0005] To achieve the above-mentioned technical objectives, the specific technical solution of the present invention is as follows: The present invention proposes a miniature circuit breaker with an anti-rebound structure, comprising a housing, stationary contacts, moving contacts, and an arc-extinguishing chamber, and further comprising: a drive frame for controlling the closing or opening of the stationary and moving contacts, the drive frame being provided with an operating rod; a torsion seat, the torsion seat being rotatably connected to the drive frame with a first connecting rod, and a support plate being fixedly connected to the stationary contacts, the torsion seat being rotatably connected to the support plate with a second connecting rod; a locking frame, the torsion seat being provided with a jump rod engaging with the locking frame, the locking frame being connected with a first tension spring; an electromagnetic solenoid, the electromagnetic solenoid being connected with a push rod for actuating the locking frame, and when the push rod actuates the locking frame, it causes the jump rod to separate from the locking frame; and an anti-rebound mechanism for preventing the moving contacts from rebounding after opening, the anti-rebound mechanism being connected to the drive frame.

[0006] As a preferred embodiment of the present invention, the anti-rebound mechanism includes a connecting frame, a ratchet rotatably connected to the connecting frame, a plurality of ratchet grooves provided on the circumferential surface of the ratchet, a pawl cooperating with the ratchet connected to the connecting frame, a fixed rod coaxially fixedly connected to the ratchet, and a third connecting rod rotatably connected between the fixed rod and the drive frame.

[0007] As a preferred embodiment of the present invention, the connecting frame is provided with a baffle, and a slide rod is slidably connected to the baffle. One end of the slide rod extends to the outside, and a pressure plate and a limiting rod are fixedly connected to the slide rod respectively. A pawl is provided between the pressure plate and the limiting rod, and both sides of the pawl are in contact with the surfaces of the pressure plate and the limiting rod respectively. The pressure plate is used to press the pawl onto the ratchet.

[0008] As a preferred embodiment of the present invention, a fine-tuning screw is threadedly connected to the baffle, a retaining ring is fixedly connected to the fine-tuning screw, a cylindrical spring is connected between the retaining ring and the pressure plate, the cylindrical spring is sleeved on the fine-tuning screw, and a limiting post is provided on the pressure plate to cooperate with the cylindrical spring.

[0009] As a preferred embodiment of the present invention, a support rod is fixedly connected to the slide rod, a stop rod is fixedly connected to the support rod, and a locking rod that cooperates with the stop rod is fixedly connected to the fixed rod. A second tension spring is connected between the fixed rod and the connecting frame.

[0010] As a preferred embodiment of the present invention, an upper terminal block and a lower terminal block are respectively installed at the upper and lower ends of the housing. The upper terminal block is connected to the stationary contact piece, and the lower terminal block is connected to one end of the electromagnetic solenoid, and the other end of the electromagnetic solenoid is connected to the moving contact piece.

[0011] As a preferred embodiment of the present invention, the lock frame is provided with a slot, one end of the jump rod is provided with a ball-shaped locking part that engages with the slot, and the outer shell is provided with a stop for limiting the lock frame.

[0012] As a preferred embodiment of the present invention, a torsion spring is installed inside the torsion seat.

[0013] The beneficial effects of this invention are as follows: 1. The anti-rebound mechanism of the present invention is equipped with a ratchet and a pawl. When the circuit breaker is opened, the drive frame drives the ratchet to rotate. The pawl limits the ratchet to prevent it from rotating in the opposite direction, thereby avoiding the rebound of the moving contact and reducing the probability of arcing and re-breakdown of the circuit breaker.

[0014] 2. The anti-rebound mechanism of the present invention is equipped with a stop bar, a locking bar, and a second tension spring. During the circuit breaker tripping process, the drive frame drives the ratchet to rotate. When the ratchet rotates, it drives the stop bar to move, causing the stop bar to separate from the locking bar. The second tension spring applies tension to the ratchet, providing auxiliary power for the circuit breaker tripping and avoiding the phenomenon of the circuit breaker jamming and failing to trip. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a miniature circuit breaker with an anti-rebound structure proposed in this invention.

[0016] Figure 2 This is a frontal view of the present invention.

[0017] Figure 3 This is a schematic diagram showing the connection between the drive frame and the anti-rebound mechanism proposed in this invention.

[0018] Figure 4 This is a schematic diagram of the anti-rebound mechanism proposed in this invention.

[0019] Figure 5 This is another schematic diagram of the anti-rebound mechanism proposed in this invention.

[0020] Figure 6 This is a schematic diagram of the slide bar proposed in this invention.

[0021] In the diagram: 1. Outer shell; 2. Anti-rebound mechanism; 21. Connecting frame; 22. Ratchet; 23. Slide rod; 231. Support rod; 232. Stop rod; 233. Pressure plate; 234. Limiting rod; 235. Limiting post; 24. Fine-tuning screw; 241. Retaining ring; 242. Cylindrical spring; 25. Fixing rod; 26. Locking rod; 27. Third connecting rod; 28. Second tension spring; 29. ​​Pawl; 210. Baffle; 3. Drive frame; 31. Operating lever; 4. Stationary contact piece; 5. Moving contact piece; 6. Torque seat; 7. First connecting rod; 8. Second connecting rod; 9. Jumping rod; 10. Locking frame; 11. Electromagnetic solenoid; 12. Arc extinguishing chamber; 13. Support plate; 14. Upper terminal; 15. Lower terminal; 16. First tension spring; 17. Top rod. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0023] Example: This example discloses a miniature circuit breaker with an anti-rebound structure, such as... Figures 1-6As shown, it includes: a housing 1, inside which a stationary contact 4 and a moving contact 5 are installed, and the opening or closing of the circuit breaker can be controlled by controlling the rotation of the moving contact 5; an arc-extinguishing chamber 12 is also installed inside the housing 1 to absorb the electric arc generated when the circuit breaker closes or opens; a drive frame 3 for controlling the opening or closing of the stationary contact 4 and the moving contact 5, and an operating rod 31 is provided on the drive frame 3, which extends to the outside of the housing 1; and a torque seat 6, inside which a torsion spring is installed to drive the torque seat 6 counterclockwise. When the needle rotates, it causes the moving contact 5 and the stationary contact 4 to separate. The torque seat 6 and the drive frame 3 are rotatably connected by a first connecting rod 7, and a support plate 13 is fixedly connected to the stationary contact 4. The torque seat 6 and the support plate 13 are rotatably connected by a second connecting rod 8. When the operating lever 31 rotates downward, it causes the torque seat 6 to rotate counterclockwise, causing the moving contact 5 and the stationary contact 4 to separate, and the circuit breaker to open. When the operating lever 31 rotates upward, it causes the torque seat 6 to rotate clockwise, causing the moving contact 5 and the stationary contact 4 to contact, and the circuit breaker to close.

[0024] Furthermore, a locking frame 10 is rotatably connected inside the outer casing 1. A jump rod 9 that engages with the locking frame 10 is provided on the torque seat 6. A first tension spring 16 is connected to the locking frame 10, and one end of the first tension spring 16 is fixedly connected to the outer casing 1. The first tension spring 16 applies tension to the locking frame 10, causing the jump rod 9 to engage with the locking frame 10. The locking frame 10 is provided with a slot, and one end of the jump rod 9 is provided with a ball-shaped locking part that engages with the slot. The outer casing 1 is provided with a stop for limiting the locking frame 10. When the jump rod 9 separates from the locking frame 10, the stop limits the locking frame 10 so that the jump rod 9 can engage with the locking frame 10 again. An electromagnetic solenoid 1 is also installed inside the outer casing 1. 1. An internal push rod 17 is connected to the electromagnetic solenoid 11 to push the lock frame 10 to rotate. When a short circuit occurs, the current through the electromagnetic solenoid 11 increases, which pushes the lock frame 10 to rotate through the push rod 17, thereby causing the jump rod 9 to separate from the lock frame 10 instantly. At this time, the torsion seat 6 rotates counterclockwise under the action of the torsion spring, so that the moving contact 5 and the stationary contact 4 are quickly separated. The upper and lower ends of the outer casing 1 are respectively equipped with an upper terminal 14 and a lower terminal 15. The upper terminal 14 is connected to the stationary contact 4, and the lower terminal 15 is connected to one end of the electromagnetic solenoid 11, and the other end of the electromagnetic solenoid 11 is connected to the moving contact 5.

[0025] like Figures 3-6As shown, an anti-rebound mechanism 2 is also installed inside the outer casing 1 to prevent the moving contact 5 from rebounding after opening. The anti-rebound mechanism 2 is located below the drive frame 3 and is connected to the drive frame 3. The anti-rebound mechanism 2 includes a connecting frame 21, which is fixedly connected to the outer casing 1. A ratchet 22 is rotatably connected to the connecting frame 21. The ratchet 22 has several ratchet grooves on its circumference. A pawl 29 that cooperates with the ratchet 22 is rotatably connected to the connecting frame 21. A fixed rod 25 is coaxially fixedly connected to the ratchet 22. When the ratchet 22 rotates, it drives the fixed rod 25 to rotate. A third connecting rod 27 is rotatably connected between the fixed rod 25 and the drive frame 3. When the circuit breaker opens or closes, it drives the ratchet 22 to rotate. The connecting frame 21 is equipped with... A baffle 210 is provided, on which a sliding rod 23 is slidably connected. One end of the sliding rod 23 extends to the outside of the outer casing 1 for easy operation. A pressure plate 233 and a limiting rod 234 are fixedly connected to the sliding rod 23. A pawl 29 is located between the pressure plate 233 and the limiting rod 234, and both sides of the pawl 29 are in contact with the surfaces of the pressure plate 233 and the limiting rod 234, respectively. The pressure plate 233 is used to press the pawl 29 onto the ratchet 22, so that the pawl 29 and the ratchet 22 remain in contact. In this embodiment, when the circuit breaker is tripped, it will drive the ratchet 22 to rotate counterclockwise. By limiting the ratchet 22 with the pawl 29, the reverse rotation of the ratchet 22 is prevented, thereby reducing the rebound amplitude of the moving contact 5 and reducing the probability of arc breakdown.

[0026] Furthermore, a fine-tuning screw 24 is threaded onto the baffle 210, and a retaining ring 241 is fixedly connected to the fine-tuning screw 24. A cylindrical spring 242 is connected between the retaining ring 241 and the pressure plate 233. The cylindrical spring 242 is sleeved on the fine-tuning screw 24, and the pressure plate 233 is provided with a limiting post 235 that cooperates with the cylindrical spring 242. The cylindrical spring 242 applies pressure to the pressure plate 233, and the pressure plate 233 presses the pawl 29 tightly, so that the pawl 29 is in close contact with the ratchet 22. The position of the retaining ring 241 can be adjusted by rotating the fine-tuning screw 24, thereby adjusting the degree of pressing of the cylindrical spring 242 on the pawl 29.

[0027] like Figure 6As shown, a support rod 231 is fixedly connected to the slide rod 23, a stop rod 232 is fixedly connected to the support rod 231, and a locking rod 26 that cooperates with the stop rod 232 is fixedly connected to the fixed rod 25. A second tension spring 28 is connected between the fixed rod 25 and the connecting frame 21. The second tension spring 28 applies tension to the fixed rod 25, which drives the ratchet 22 to rotate counterclockwise. When the circuit breaker is in the closed state, the stop rod 232 limits the locking rod 26, so that the ratchet 22 remains stable. When the circuit breaker is in the open state, the drive frame 3 will drive the ratchet 22 to rotate counterclockwise. When the ratchet 22 just starts to rotate, when the end of the pawl 29 moves in the first ratchet groove, it will drive the pawl 29 to rotate slightly outward from the outer shell 1, which will drive the slide rod 23 to move slightly outward from the outer shell 1. The sliding rod 23 moves between 0.5 and 1 mm, allowing the stop rod 232 to separate from the locking rod 26 immediately. The stop rod 232 no longer limits the locking rod 26, causing the second tension spring 28 to apply a counter-clockwise rotational force to the ratchet 22, thus providing additional power for the circuit breaker to open and preventing jamming of the internal mechanisms, which could lead to incomplete opening. When closing the circuit breaker is required, the sliding rod 23 is manually pulled outwards from the outer casing 1, causing the pawl 29 to separate from the ratchet 22. At this time, the ratchet 22 can rotate clockwise, pushing the operating lever 31 upwards, causing the torque seat 6 and the ratchet 22 to rotate clockwise. The moving contact 5 contacts the stationary contact 4, causing the trip lever 9 to engage on the locking frame 10. Then, the sliding rod 23 is released, completing the closing process.

[0028] Working principle: When a short circuit occurs, the current in the electromagnetic solenoid 11 increases, causing the push rod 17 to rotate the locking frame 10. The jump rod 9 separates from the locking frame 10 instantly. The torque seat 6 rotates counterclockwise under the action of the torsion spring, causing the moving contact 5 and the stationary contact 4 to separate. The torque seat 6 also drives the drive frame 3 to rotate, which in turn drives the ratchet 22 to rotate counterclockwise. The ratchet 22 is limited by the pawl 29, preventing it from reversing and thus avoiding the rebound of the moving contact 5, reducing the probability of arc breakdown. During the rotation of the ratchet 22, the pawl 29 will rotate slightly, causing the slide rod 23 to move slightly outward from the outer casing 1, causing the stop rod 232 to separate from the locking rod 26. The second tension spring 28 applies a counterclockwise rotational force to the ratchet 22, thereby providing additional power for the circuit breaker to open and preventing the circuit breaker from jamming and failing to open properly.

[0029] Finally, it should be noted that in the description of this invention, the terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and 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 this invention.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A miniature circuit breaker with an anti-rebound structure, comprising a housing (1), stationary contacts (4), moving contacts (5), and an arc-extinguishing chamber (12), characterized in that, Also includes: The drive frame (3) is used to control the closing or opening of the stationary contact (4) and the moving contact (5). The drive frame (3) is equipped with an operating lever (31). Torque seat (6), a first connecting rod (7) is rotatably connected between torque seat (6) and drive frame (3), and a support plate (13) is fixedly connected on stationary contact plate (4), and a second connecting rod (8) is rotatably connected between torque seat (6) and support plate (13). The locking frame (10) has a jump rod (9) that engages with the locking frame (10) on the torsion seat (6), and a first tension spring (16) is connected to the locking frame (10). Electromagnetic solenoid (11), with a push rod (17) connected inside the electromagnetic solenoid (11) for pushing the lock frame (10) to rotate, and when the push rod (17) pushes the lock frame (10) to rotate, it causes the jump rod (9) to separate from the lock frame (10); The anti-rebound mechanism (2) is used to prevent the moving contact piece (5) from rebounding after the circuit breaker is opened. The anti-rebound mechanism (2) is connected to the drive frame (3).

2. A miniature circuit breaker with anti-rebound structure according to claim 1, characterized in that, The anti-rebound mechanism (2) includes a connecting frame (21), a ratchet (22) is rotatably connected to the connecting frame (21), the ratchet (22) has several ratchet grooves on its circumference, and a pawl (29) that cooperates with the ratchet (22) is connected to the connecting frame (21). A fixing rod (25) is coaxially fixedly connected to the ratchet (22), and a third connecting rod (27) is rotatably connected between the fixing rod (25) and the drive frame (3).

3. A miniature circuit breaker with an anti-rebound structure according to claim 2, characterized in that, The connecting frame (21) is provided with a baffle (210), and a slide rod (23) is slidably connected on the baffle (210). One end of the slide rod (23) extends to the outside of the outer shell (1). A pressure plate (233) and a limiting rod (234) are fixedly connected on the slide rod (23). A pawl (29) is located between the pressure plate (233) and the limiting rod (234), and both sides of the pawl (29) are in contact with the surfaces of the pressure plate (233) and the limiting rod (234). The pressure plate (233) is used to press the pawl (29) onto the ratchet (22).

4. A miniature circuit breaker with anti-rebound structure according to claim 3, characterized in that, The baffle (210) is threaded with a fine-tuning screw (24), and a retaining ring (241) is fixedly connected to the fine-tuning screw (24). A cylindrical spring (242) is connected between the retaining ring (241) and the pressure plate (233). The cylindrical spring (242) is sleeved on the fine-tuning screw (24), and the pressure plate (233) is provided with a limiting post (235) that cooperates with the cylindrical spring (242).

5. A miniature circuit breaker with anti-rebound structure according to claim 4, characterized in that, A support rod (231) is fixedly connected to the slide rod (23), a stop rod (232) is fixedly connected to the support rod (231), and a locking rod (26) that cooperates with the stop rod (232) is fixedly connected to the fixed rod (25). A second tension spring (28) is connected between the fixed rod (25) and the connecting frame (21).

6. A miniature circuit breaker with an anti-rebound structure according to claim 1 or 5, characterized in that, The upper end terminal (14) and the lower end terminal (15) are respectively installed at the upper and lower ends of the outer casing (1). The upper end terminal (14) is connected to the stationary contact (4), and the lower end terminal (15) is connected to one end of the electromagnetic solenoid (11), and the other end of the electromagnetic solenoid (11) is connected to the moving contact (5).

7. A miniature circuit breaker with anti-rebound structure according to claim 6, characterized in that, The lock frame (10) is provided with a slot, one end of the jump rod (9) is provided with a ball-shaped locking part that engages with the slot, and the outer shell (1) is provided with a stop for limiting the lock frame (10).

8. A miniature circuit breaker with anti-rebound structure according to claim 7, characterized in that, A torsion spring is installed inside the torsion seat (6).

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