Miniature circuit breaker operating mechanism

Abstract

The utility model discloses a miniature circuit breaker operating mechanism, which relates to the technical field of low-voltage electric appliances, and comprises a left shell, a right shell, a handle, a lock catch, a contact seat and a moving contact, one end of the handle is linked with a jump pin through a U-shaped connecting rod, the middle part of the jump pin is rotatably connected with the contact seat, the middle part of the lock catch is rotatably connected with a fixed column, and the fixed column is fixedly connected with the left shell. The operating mechanism is of a four-connecting-rod structure, the length and the angle of the connecting rods are adjusted, the length and the angle of the connecting rods are adjusted, the length and the angle of the connecting rods are adjusted, the contact seat is arranged below the lock catch, one side of the contact seat is rotatably connected with the moving contact through the fixing pin, and the reset torsion spring is arranged below the contact seat. The arc voltage can be instantaneously increased and the arc current can be limited during the protection action of the switch, the contact is not easy to break down when the arc voltage is increased, the reliable opening and closing can be ensured, the included angle between the buckling surface of the lock catch and the jump buckle and the horizontal plane is 115-120 degrees, the tripping force is within 1.0 N, and the phenomenon of buckle sliding cannot be caused.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliance technology, specifically a miniature circuit breaker operating mechanism. Background Technology

[0002] Miniature circuit breakers are widely used in terminal electrical circuits and generally have both short-circuit protection and thermal protection functions. Short-circuit protection is achieved by an electromagnetic instantaneous trip unit. The operating mechanism is generally based on the C65 and L7 structures and extended, with an opening and closing angle of about 20° and an opening distance of 5-6 mm. As breaking capacity continues to improve, the arc voltage is usually increased to limit the arc current and achieve the purpose of rapid arc extinguishing. However, the rapid increase in arc voltage can also lead to easy breakdown between contacts, i.e., back-side breakdown. Therefore, while reliably improving breaking capacity, it is also necessary to increase the contact breaking distance to ensure the space behind the arc extinguishing chamber.

[0003] Existing circuit breaker operating mechanisms have small opening distances and small opening and closing angles, making them prone to breakdown when increasing breaking capacity and arc voltage. Furthermore, the return spring is located near the indicator window, occupying space and making installation inconvenient. Increasing the opening and closing angle can easily cause interference with the contact seat. Due to the misalignment between the latch and the contact seat, there is a large difference in torque between the linkage shaft and the electromagnetic tripping point, requiring conversion for tripping force detection, which is inconvenient for inspection. Therefore, a miniature circuit breaker operating mechanism is proposed to solve the above problems. Utility Model Content

[0004] To solve the above-mentioned technical problems, a miniature circuit breaker operating mechanism is provided. This technical solution solves the problems of existing circuit breaker operating mechanisms having small opening distance and small opening and closing angle, being prone to breakdown when increasing breaking capacity and arc voltage, having a return spring located near the indicator window which occupies space and is inconvenient to install, being prone to interference with the contact seat when trying to increase the opening and closing angle, having a large difference in torque between the linkage shaft and the electromagnetic tripping point, requiring conversion for tripping force detection, and being inconvenient to inspect.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A miniature circuit breaker operating mechanism includes a left housing, a right housing, a handle, a latch, a contact seat, and a moving contact. The handle, latch, contact seat, and moving contact are disposed inside the left and right housings. The middle part of the handle is rotatably connected to a fixing pin on the inner wall of the right housing. One end of the handle is linked to a trip latch via a U-shaped connecting rod. The middle part of the trip latch is rotatably connected to the contact seat. The middle part of the latch is rotatably connected to a fixing post. One end of the fixing post is fixedly connected to the inner wall of the right housing. A latch torsion spring is disposed above the fixing post and is sleeved on the outside of the fixing post. The contact seat is disposed below the latch. The middle part of the contact seat is rotatably connected to the fixing post. One side of the contact seat is rotatably connected to the moving contact via a fixing pin. A moving contact torsion spring is sleeved on the outside of the fixing pin. One end of the moving contact torsion spring is engaged with the contact seat, and the other end of the moving contact torsion spring is engaged with the moving contact. A reset torsion spring is disposed below the contact seat.

[0007] Preferably, one end of the reset torsion spring extends into the fixing groove opened inside the right housing, and the other end of the reset torsion spring extends to one side of the limiting post connected inside the right housing and abuts against the buckle. The buckle is disposed on the contact seat at the end away from the moving contact.

[0008] Preferably, one end of the snap fastener is provided with a locking tooth, and the contact point between the snap fastener and the snap fastener is provided with a locking tooth that matches the snap fastener.

[0009] Preferably, one side of the latch is provided with an electromagnetic release surface, and the other side of the latch is provided with multi-stage assembly linkage shaft holes.

[0010] Preferably, one end of the locking torsion spring is engaged with the contact seat, and the other end of the locking torsion spring is engaged with the locking buckle.

[0011] Preferably, one end of the latch is rotatably connected to a release lever, and the other end of the release lever is fixedly connected to a hot bimetallic strip.

[0012] Preferably, a solenoid is provided on one side of the handle, and an electromagnetic component is provided inside the solenoid. The output end of the electromagnetic component is located above the electromagnetic tripping surface.

[0013] Preferably, the lower end of the solenoid is connected to a stationary contact, and an arc-extinguishing chamber is provided on one side of the stationary contact.

[0014] The advantages of this utility model compared with the prior art are:

[0015] 1. This utility model is equipped with a trip latch, a locking latch, a contact seat, and a moving contact. The locking latch and the contact seat are linked by a locking latch torsion spring. The trip latch and the locking latch are engaged by locking teeth. The moving contact is rotatably connected to a fixing pin at one end of the contact seat. A moving contact torsion spring is provided between the contact seat and the moving contact. The contact structure is a four-bar linkage. By adjusting the distance from the fixing post to the connection point of the U-shaped link and the trip latch, as well as the distance from the U-shaped link to the handle and the connection point of the U-shaped link, the contact opening distance is designed to be 8-9 mm with an overtravel of 1.5 mm. This allows the switch to instantaneously increase the arc voltage during protection action, limiting the arc current and making it less likely for the contacts to break down when the arc voltage is increased, thus ensuring reliable switch opening and closing.

[0016] 2. In this design, the latch rotates coaxially with the contact seat via a fixed post. A latch torsion spring ensures reliable engagement between the latch and the jumper on the contact seat. The distance from the electromagnetic tripping surface to the axis of the fixed post is consistent with the distance from the multi-stage linkage shaft hole to the axis of the fixed post, improving the detection efficiency of the tripping force and making the multi-stage linkage more stable and reliable. The angle between the latching surface and the horizontal plane is 115°-120°, ensuring that the tripping force is within 1.0N and preventing slippage, thus further improving the mechanical performance of the switch. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of the latch, contact seat, and moving contact in this utility model;

[0020] Figure 4 This is a structural schematic diagram of the latch, contact seat, and moving contact from another perspective in this utility model.

[0021] Figure 5 This is a schematic diagram of the reset torsion spring in this utility model.

[0022] The numbers on the map are:

[0023] 1. Left housing; 2. Right housing; 21. Fixing groove; 22. Limiting post; 3. Handle; 31. U-shaped connecting rod; 32. Jumper buckle; 4. Locking buckle; 41. Fixing post; 42. Tripping rod; 43. Locking torsion spring; 44. Thermo-bimetallic strip; 45. Electromagnetic tripping surface; 46. Multi-stage assembly linkage shaft hole; 5. Contact seat; 51. Snap-fit; 52. Reset torsion spring; 6. Moving contact; 61. Moving contact torsion spring; 7. Stationary contact; 8. Solenoid; 81. Electromagnetic assembly; 9. Arc extinguishing chamber. Detailed Implementation

[0024] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0025] like Figure 1-5As shown, a miniature circuit breaker operating mechanism includes a left housing 1, a right housing 2, a handle 3, a latch 4, a contact seat 5, and a moving contact 6. The handle 3, latch 4, contact seat 5, and moving contact 6 are disposed inside the left housing 1 and the right housing 2. The middle part of the handle 3 is rotatably connected to a fixing pin on the inner wall of the right housing 2. One end of the handle 3 is linked to a trip latch 32 via a U-shaped connecting rod 31. The middle part of the trip latch 32 is rotatably connected to the contact seat 5. One end of the trip latch 32 is provided with a locking tooth. The contact point between the latch 4 and the trip latch 32 is provided with a locking tooth that matches the trip latch 32. The middle part of the latch 4 is rotatably connected to a fixing post 41. One end of the fixing post 41 is fixedly connected to the inner wall of the right housing 2. A latch torsion spring 43 is provided above the fixing post 41 and is sleeved on the outside of the fixing post 41. One end of the latch torsion spring 43 is engaged with the contact seat 5. The other end of the locking torsion spring 43 is engaged with the locking buckle 4. One side of the locking buckle 4 is provided with an electromagnetic release surface 45, and the other side of the locking buckle 4 is provided with a multi-stage assembly linkage shaft hole 46. The contact seat 5 is located below the locking buckle 4. The middle part of the contact seat 5 is rotatably connected to the fixing post 41. One side of the contact seat 5 is rotatably connected to the moving contact 6 through a fixing pin. The moving contact torsion spring 61 is sleeved on the outside of the fixing pin. One end of the moving contact torsion spring 61 is engaged with the contact seat 5, and the other end of the moving contact torsion spring 61 is engaged with the moving contact 6. A reset torsion spring 52 is provided below the contact seat 5. One end of the reset torsion spring 52 extends into the fixing groove 21 opened inside the right housing 2, and the other end of the reset torsion spring 52 extends into one side of the limiting post 22 connected inside the right housing 2 and abuts against the buckle 51. The buckle 51 is located on the contact seat 5 at the end away from the moving contact 6. With the above settings, the contact structure in this scheme is a four-bar linkage. By adjusting the distance between the fixed post 41 and the connection point of the U-shaped link 31 and the jumper 32, as well as the distance between the U-shaped link 31 and the handle 3 and the connection point of the U-shaped link 31, the contact opening distance is designed to be 8-9mm with an overtravel of 1.5mm. This allows the switch to instantaneously increase the arc voltage during protection action, limiting the arc current and preventing contact breakdown when increasing the arc voltage, thus ensuring reliable switch opening and closing. The moving contact 6 is fixed to the contact seat 5 by the moving contact torsion spring 61, and the latch 4 is... The fixed post 41 rotates coaxially with the contact seat 5. The locking spring 43 reliably engages the locking buckle 4 with the jump buckle 32 on the contact seat 5. The axial distance from the electromagnetic tripping surface 45 to the fixed post 41 is consistent with the axial distance from the multi-stage assembly linkage shaft hole 46 to the fixed post 41, which improves the detection efficiency of the tripping force and makes the multi-stage linkage more stable and reliable. The angle between the engagement surface of the locking buckle 4 and the jump buckle 32 and the horizontal plane is 115°-120°, ensuring that the tripping force is within 1.0N and will not cause slippage, thus further improving the mechanical performance of the switch.

[0026] One end of the latch 4 is rotatably connected to the trip lever 42, and the other end of the trip lever 42 is fixedly connected to the hot bimetallic strip 44. A solenoid 8 is provided on one side of the handle 3. An electromagnetic component 81 is provided inside the solenoid 8. The output end of the electromagnetic component 81 is located above the electromagnetic trip surface 45. A stationary contact 7 is connected to the lower end of the solenoid 8. An arc-extinguishing chamber 9 is provided on one side of the stationary contact 7.

[0027] The principle of this utility model is as follows: When a short circuit occurs in the circuit, the current in the solenoid 8 rises in a very short time, and the solenoid 8 generates a strong magnetic field. The magnetic field causes the cylindrical block in the electromagnetic component 81 to push out and abut against the electromagnetic tripping surface 45, thereby pushing the latch 4. The latch 4 rotates along the fixed post 41 and compresses the latch torsion spring 43. The other end of the latch torsion spring 43 drives the contact seat 5 and the moving contact 6 to rotate, causing the moving contact 6 to separate from the stationary contact 7, thus breaking the circuit. The high-voltage arc generated when the circuit is broken is absorbed by the arc-extinguishing chamber 9. In this operating mechanism, by adjusting the distance from the fixed post 41 to the connection point of the U-shaped connecting rod 31 and the jumper 32, and the distance from the U-shaped connecting rod 31 to the connection point of the handle 3 and the U-shaped connecting rod 31, the contact opening distance is designed to be 8-9 mm with an overtravel of 1.5 mm, so that the switch can... During protection action, the arc voltage can be instantaneously increased, limiting the arc current and preventing contact breakdown when the arc voltage is increased, thus ensuring reliable switch opening and closing. The moving contact 6 is fixed to the contact seat 5 by the moving contact torsion spring 61. The latch 4 rotates coaxially with the contact seat 5 through the fixing post 41. The latch torsion spring 43 ensures reliable engagement between the latch 4 and the jumper 32 on the contact seat 5. The axial distance from the electromagnetic tripping surface 45 to the fixing post 41 is consistent with the axial distance from the multi-stage assembly linkage shaft hole 46 to the fixing post 41, improving the detection efficiency of the tripping force and making the multi-stage linkage more stable and reliable. The angle between the latching surface of the latch 4 and the jumper 32 and the horizontal plane is 115°-120°, ensuring that the tripping force is within 1.0N and will not cause slippage, further improving the mechanical performance of the switch.

[0028] 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 principles of this 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 claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A small circuit breaker operating mechanism characterized by: The utility model provides a kind of electric switch, including left shell (1), right shell (2), handle (3), catch (4), contact seat (5) and moving contact (6), the handle (3), catch (4), contact seat (5) and moving contact (6) are arranged in the inside of left shell (1) and right shell (2), the middle part of the handle (3) is rotatably connected with the fixed pin on the inner wall of right shell (2), one end of the handle (3) is linked with jump catch (32) by U-shaped connecting rod (31), the middle part of the jump catch (32) is rotatably connected with contact seat (5), the middle part of the catch (4) is rotatably connected with fixed column (41), one end of the fixed column (41) is fixedly connected to the inner wall of right shell (2), lock catch torsion spring (43) is provided above the fixed column (41), the lock catch torsion spring (43) is sleeved on the outside of fixed column (41), the contact seat (5) is arranged below the catch (4), the middle part of the contact seat (5) is rotatably connected with fixed column (41), one side of the contact seat (5) is rotatably connected with moving contact (6) by fixed pin, moving contact torsion spring (61) is sleeved on the outside of fixed pin, one end of the moving contact torsion spring (61) is clamped with contact seat (5), the other end of the moving contact torsion spring (61) is clamped with moving contact (6), reset torsion spring (52) is provided below the contact seat (5).

2. A small-sized circuit breaker operating mechanism according to claim 1, characterized in that: One end of the reset torsion spring (52) extends to the inside of the fixed groove (21) opened in the inside of right shell (2), the other end of the reset torsion spring (52) extends to one side of the limiting column (22) connected in the inside of right shell (2) and abuts with buckle (51), the buckle (51) is arranged on the end of contact seat (5) away from moving contact (6).

3. A small circuit breaker operating mechanism according to claim 1, characterized in that: One end of the jump catch (32) is provided with lock teeth, the abutment of the catch (4) and jump catch (32) is provided with lock teeth matched with jump catch (32).

4. A small circuit breaker operating mechanism according to claim 1, characterized in that: One side of the catch (4) is provided with electromagnetic tripping surface (45), the other side of the catch (4) is provided with multi-stage assembly linkage shaft hole (46).

5. A small circuit breaker operating mechanism according to claim 1, characterized in that: One end of the lock catch torsion spring (43) is clamped with contact seat (5), the other end of the lock catch torsion spring (43) is clamped with catch (4).

6. A small circuit breaker operating mechanism according to claim 1, characterized in that: One end of the catch (4) is rotatably connected with tripping rod (42), the other end of the tripping rod (42) is fixedly connected with thermal bimetallic strip (44).

7. A small circuit breaker operating mechanism according to claim 1, characterized in that: One side of the handle (3) is provided with solenoid (8), electromagnetic assembly (81) is arranged in the inside of solenoid (8), the output end of electromagnetic assembly (81) is arranged above electromagnetic tripping surface (45).

8. A small circuit breaker operating mechanism according to claim 7, characterized in that: The lower end of the solenoid (8) is connected with static contact (7), one side of the static contact (7) is provided with arc chamber (9).

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