Anti-impact backstop mechanism of circuit breaker

Abstract

The invention discloses an anti-impact backstop mechanism of a circuit breaker, which comprises an operating mechanism, an inertia wheel, a spring and a gear, and is characterized in that the operating mechanism is connected with a contact system so as to drive the contact system to switch on or switch off, and the inertia wheel, the spring and the gear are mounted on the operating mechanism; under the combined action of the spring, the inertia wheel and the gear, the output shaft of the operating mechanism is locked to ensure that the contact system is in a stable opening state, and the output shaft of the operating mechanism automatically returns to a normal state when the contact system returns to a common environment after impact, so that the impact resistance, compact structure and high reliability of the circuit breaker in the opening state are realized.

Description

Technical Field

[0001] This invention belongs to the field of low-voltage electrical appliance technology, specifically relating to a circuit breaker anti-impact stop mechanism. Background Technology

[0002] Circuit breakers are important power distribution protection devices widely used in power grids. They are responsible for connecting, carrying, and disconnecting current under normal circuit conditions, as well as for promptly disconnecting circuit current under specified abnormal conditions. Therefore, reliable operation of circuit breakers is crucial. Especially in special operating environments with shocks, vibrations, etc., it is particularly important that circuit breakers do not malfunction.

[0003] Currently, the common low-voltage frame circuit breakers on the market typically employ a structure combining the DW45 operating mechanism with a snap-action multi-finger contact system. This type of circuit breaker has many advantages, such as high short-term withstand capability and high breaking capacity. However, because the contact system of this mechanism is kept in the open state under the action of the opening spring force, the output shaft of the mechanism or the contact system is not locked. Since the rated current of frame circuit breakers is usually above 1600A, the contact system has a large mass, resulting in a large inertia of the contact system. This makes the circuit breaker less resistant to impact when the contact system is in the open state.

[0004] Impact tests revealed that when this type of circuit breaker is subjected to an impact in the closing direction while in the open state, the moving contact will move from the open direction to the closing direction, which reduces the opening distance between the moving and stationary contacts. When the impact force is large enough, the moving and stationary contacts will make contact briefly, which seriously affects the reliability of the circuit breaker in the open state. Summary of the Invention

[0005] In view of the above problems, the present invention provides a circuit breaker anti-impact stop mechanism.

[0006] The technical solution adopted by this invention to solve its technical problem is: a circuit breaker anti-impact stop mechanism, including an operating mechanism. The operating mechanism includes a mechanism body and a stop pin, an inertia wheel pin, and a gear pin fixedly installed on the mechanism body by riveting. A rotating shaft assembly that can freely rotate at a certain angle is also installed on the mechanism body by hinge. The rotating shaft assembly includes a shaft and a sector gear and a connecting rod fixedly installed on the shaft by welding. The connecting rod is connected to the contact system through a pull rod, thereby driving the contact system to close or open. An inertia wheel pin is installed on the inertia wheel pin by hinge, which is limited by the stop pin after rotating to a certain angle. The inertia wheel pin can freely rotate around the inertia wheel pin by a certain angle under the action of the stop pin and the gear. A gear that can freely rotate around the gear pin and meshes with the sector gear is installed on the gear pin by hinge. When the operating mechanism closes, the shaft rotates counterclockwise, thereby driving the gear to rotate clockwise through the sector gear. When the operating mechanism opens, the shaft rotates clockwise, thereby driving the gear to rotate counterclockwise through the sector gear.

[0007] The circuit breaker anti-impact stop mechanism includes a spring pin mounted on its main body. The gear comprises a friction wheel and a gear body meshing with a sector gear. The inertia wheel comprises an inertia wheel body and an inertia wheel post fixedly mounted on the inertia wheel body by riveting. A spring is installed between the inertia wheel post and the spring pin. Under the action of the spring force, there is a gap of 0.1mm to 0.5mm between the inertia wheel body and the friction wheel, so that the rotation of the gear is not affected by the inertia wheel under normal conditions.

[0008] The circuit breaker anti-impact stop mechanism has an inertia wheel whose center of gravity is below the inertia wheel pin, and the outer contour surface of the inertia wheel is an arc shape whose radius gradually increases in the clockwise direction.

[0009] The circuit breaker anti-impact stop mechanism has a minimum radius of inertia wheel that is 1mm to 2mm smaller than the distance between the inertia wheel pin and the outer surface of the friction wheel, and a maximum radius that is 1mm to 2mm larger than the distance between the inertia wheel pin and the outer surface of the friction wheel.

[0010] Compared with existing known technologies, the technical solution provided by this invention has the following significant advantages:

[0011] This invention patent combines the principle of one-way friction clutch with the principle of inertia, so that the anti-impact stop mechanism locks the output shaft of the operating mechanism when the circuit breaker is in the opening and impact state, and the greater the impact force, the more reliable the locking. In other states, it has no constraint or impact on the circuit breaker operating mechanism. The structure is simple and the reliability is high. Attached Figure Description

[0012] Figure 1 This is an overall schematic diagram of the present invention;

[0013] Figure 2 This is a schematic diagram illustrating the working principle of the present invention;

[0014] Figure 3 This is a schematic diagram of the gears in this invention;

[0015] Figure 4 This is a schematic diagram of the inertia wheel of the present invention.

[0016] The reference numerals in the attached figures are as follows: 1—operating mechanism, 11—mechanism body, 12—stop pin, 13—spring pin, 14—inertia wheel pin, 15—gear pin, 16—rotating shaft assembly, 161—sector gear, 162—shaft, 163—connecting rod, 2—inertia wheel, 21—inertia wheel body, 22—inertia wheel column, 3—spring, 4—gear, 41—gear body, 42—friction wheel, 5—contact system, 51—moving contact system, 52—stationary contact, 6—pull rod. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the present invention is not limited to the following embodiments.

[0018] The purpose of this invention is to overcome the problems existing in existing frame circuit breakers, such as the circuit breaker being held open by a spring after opening, the output shaft or contact system of the circuit breaker operating structure not being locked in this state, and the possibility of accidental closing when subjected to impact in the closing direction. This invention provides a circuit breaker anti-impact stop mechanism that combines the principles of a one-way friction clutch and inertia. This mechanism locks the output shaft of the operating mechanism when the circuit breaker is in the open or under impact condition, and the greater the impact force, the more reliable the locking. In other states, it has no constraint or impact on the circuit breaker operating mechanism, and the structure is simple and highly reliable.

[0019] Reference Figure 1 and Figure 2As shown, the present invention discloses a circuit breaker anti-impact stop mechanism, mainly composed of an operating mechanism 1, an inertia wheel 2, a spring 3, and a gear 4. The operating mechanism 1 includes a mechanism body 11, a stop pin 12, a spring pin 13, an inertia wheel pin 14, a gear pin 15, and a rotating shaft assembly 16. The stop pin 12, spring pin 13, inertia wheel pin 14, and gear pin 15 are fixedly installed on the mechanism body 11 by riveting. The rotating shaft assembly 16 is installed on the mechanism body 11 by hinge, allowing it to rotate freely at a certain angle. It is connected to the contact system 5, which consists of a moving contact system 51 and a stationary contact 52, via a pull rod 6, thereby driving the contact system 51 to close or open the circuit. The gear 4 is hinged to the gear pin 15 of the operating mechanism 1 and can rotate freely around the gear pin 15. The inertia wheel 2 is hinged to the inertia wheel pin 14 of the operating mechanism 1 and can rotate freely around the inertia wheel pin 14 at a certain angle under the action of the stop pin 12 and the gear 4. The rotating shaft assembly 16 includes a sector gear 161, a shaft 162 and a connecting rod 163. The connecting rod 163 is connected to the contact head system 5 through a pull rod 6. The sector gear 161 and the connecting rod 163 are fixedly mounted on the rotating shaft assembly 16 by welding.

[0020] Reference Figure 2 and Figure 3 As shown, the gear 4 includes a gear body 41 and a friction wheel 42. The gear body 41 on the gear 4 is connected to the sector gear 161 on the rotating shaft assembly 16 by a gear. When the operating mechanism 1 closes the circuit, the shaft 162 rotates counterclockwise, thereby driving the gear 4 to rotate clockwise. When the operating mechanism 1 opens the circuit, the shaft 162 rotates clockwise, thereby driving the gear 4 to rotate counterclockwise.

[0021] Reference Figure 2 and Figure 4 As shown, the inertia wheel 2 includes an inertia wheel body 21 and an inertia wheel column 22. The inertia wheel column 22 is fixedly installed on the inertia wheel body 21 by riveting. The spring 3 is installed on the spring pin 13 and the inertia wheel column 22. Under the action of the spring force, there is a gap of 0.1mm to 0.5mm between the inertia wheel body 21 and the friction wheel 42 on the gear 4. Thus, under normal conditions, the rotation of the gear 4 is not affected by the inertia wheel 2.

[0022] Reference Figure 1 and Figure 2As shown, the center of gravity of the inertia wheel 2 is below the inertia wheel pin 14. The outer contour surface of the inertia wheel 2 is an arc shape with the radius gradually increasing in the clockwise direction. The minimum radius of the inertia wheel 2 is 1mm to 2mm smaller than the distance between the inertia wheel pin 14 and the outer circular surface of the friction wheel 42, and the maximum radius is 1mm to 2mm larger than the distance between the inertia wheel pin 14 and the outer circular surface of the friction wheel 42. When the contact system 5 is subjected to an impact in the closing direction in the open state, that is, when the circuit breaker operating mechanism 1 and the contact system 5 are subjected to a rightward impact, the moving contact 51 moves to the right under the action of inertial force, driving the shaft 162 to rotate counterclockwise, which in turn drives the gear 4 to rotate clockwise. At the same time, the inertia wheel 2 rotates counterclockwise under the action of inertial force and contacts the friction wheel 42 on the gear 4, causing the inertia wheel 2 and the friction wheel 42 to jam, thereby locking the shaft 162. After the impact ends, the inertia wheel 2 returns to the initial gap position with the friction wheel 42 under the action of the spring 3, and the shaft 162 returns to the free state.

[0023] The greater the impact of the contact system 5 in the closing direction when it is in the open state, the greater the counterclockwise rotational torque on the inertia wheel 2 and the clockwise rotational torque on the friction wheel 42, thus locking the shaft 162 and making the inertia wheel 2 and friction wheel 42 more severely jammed, thereby making the locking shaft assembly 16 more reliable.

[0024] The above embodiments are merely illustrative of the principles and effects of the present invention, as well as some of the application examples. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A circuit breaker anti-impact stop mechanism, characterized in that: The system includes an operating mechanism (1), which includes a mechanism body (11) and a stop pin (12), an inertia wheel pin (14) and a gear pin (15) fixed on the mechanism body (11). The mechanism body (11) is also equipped with a rotatable shaft assembly (16), which includes a shaft (162) and a sector gear (161) and a connecting rod (163) fixed on the shaft (162). The connecting rod (163) is connected to the contact head system (5) through a pull rod (6). An inertia wheel (2) is installed on the inertia wheel pin (14) and is limited by the stop pin (12) after rotation. A gear (4) is installed on the gear pin (15) and meshes with the sector gear (161).

2. The circuit breaker anti-impact stop mechanism according to claim 1, characterized in that, The mechanism body (11) is equipped with a spring pin (13), the gear (4) includes a friction wheel (42) and a gear body (41) that meshes with a sector gear (161), the inertia wheel (2) includes an inertia wheel body (21) and an inertia wheel column (22) fixed on the inertia wheel body (21), a spring (3) is connected between the inertia wheel column (22) and the spring pin (13), and there is a gap of 0.1 mm to 0.5 mm between the inertia wheel body (21) and the friction wheel (42).

3. A circuit breaker anti-impact stop mechanism according to claim 1 or 2, characterized in that, The outer contour surface of the inertial wheel (2) is an arc shape with a radius that gradually increases in the clockwise direction.

4. The circuit breaker anti-impact stop mechanism according to claim 3, characterized in that, The minimum radius of the inertia wheel (2) is 1mm to 2mm smaller than the distance between the inertia wheel pin (14) and the outer circular surface of the friction wheel (42), and the maximum radius is 1mm to 2mm larger than the distance between the inertia wheel pin (14) and the outer circular surface of the friction wheel (42).

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