阅读说明：本技术 一种大电流快速断路器的惯性减震装置 (Inertia damping device of high-current quick circuit breaker ) 是由 沈文 孔凡良 赵成宏 祝聪 汪浩 于 2020-12-16 设计创作，主要内容包括：本发明公开了一种大电流快速断路器的惯性减震装置,包括齿轮减速器、制动装置、制动盘装置、传动轴、压缩弹簧、和防护罩板；齿轮减速器由底板、主动齿轮、中间齿轮、从动齿轮、上板、支柱及定位轴组成,定位轴焊接固定在上板,上板和底板中间由支柱支撑；制动装置由制动片、杠杆、轴销和滚轮组成；制动盘装置由制动盘、配重盘、防松垫片组成；所述的传动轴由凸轮和扇形齿轮组成；本发明可实现减小震动、增加断路器机械耐磨性,降低甚至消除断路器触头弹跳的功能,同时具有结构紧凑、安装维护简单、可靠性高的特点。(The invention discloses an inertia damping device of a high-current quick circuit breaker, which comprises a gear reducer, a braking device, a braking disc device, a transmission shaft, a compression spring and a protective cover plate, wherein the gear reducer is arranged on the transmission shaft; the gear reducer consists of a bottom plate, a driving gear, an intermediate gear, a driven gear, an upper plate, a strut and a positioning shaft, the positioning shaft is welded and fixed on the upper plate, and the middle of the upper plate and the bottom plate is supported by the strut; the braking device consists of a braking piece, a lever, a shaft pin and a roller; the brake disc device consists of a brake disc, a counterweight disc and a check washer; the transmission shaft consists of a cam and a sector gear; the invention can realize the functions of reducing vibration, increasing the mechanical wear resistance of the circuit breaker and reducing or even eliminating the bounce of the contact of the circuit breaker, and has the characteristics of compact structure, simple installation and maintenance and high reliability.)

1. The utility model provides an inertia damping device of heavy current quick circuit breaker which characterized in that: comprises a gear reducer (2), a braking device (3), a brake disc device (6) and a transmission shaft (4); the gear reducer (2) consists of a bottom plate (24), an upper plate (25), and a driving gear (21), an intermediate gear (22) and a driven gear (23) which are assembled between the bottom plate (24) and the upper plate (25) and form three-stage gear transmission, wherein a protective cover plate (1) is fixed on the bottom plate (24), and a positioning shaft (27) is fixed on the upper plate (25); the brake device (3) consists of a lever (32) assembled on a positioning shaft (27), a roller (31) arranged at one end of the lever (32) and a brake pad (34) fixed at the other end of the lever (32) through a shaft pin (33), the lever (32) is connected with a compression spring (5), the other end of the compression spring (5) is connected with an upper plate (25) through a fixed block, and the compression spring (5) provides braking force for the brake pad (34); the brake disc device (6) consists of a brake disc (61) assembled on the driven gear (23) and a counterweight disc (62) arranged on the brake disc (61); the transmission shaft (4) is provided with a cam (41) and a sector gear (42), the sector gear (42) is meshed with the driving gear (21), and power is provided for the brake disc device (6) through three-stage gear transmission.

2. An inertial damping device for a high current fast circuit breaker according to claim 1, characterized in that said upper plate (25) and said lower plate (24) are supported by an intermediate strut (26).

3. An inertial damping device for a high current fast circuit breaker according to claim 1, characterized in that said plurality of weight plates (62) are fastened to the brake disc (61) by anti-loose washers (63) and fastening screws.

Technical Field

The invention belongs to the technical field of direct-current switching appliances, and particularly relates to an inertia damping device of a high-current quick circuit breaker.

Background

The closing bounce is an inherent phenomenon commonly existing in an alternating current circuit breaker and a direct current circuit breaker, and refers to a phenomenon that a moving contact of the circuit breaker is bounced off by a reaction force after colliding with a fixed contact, and then the moving contact is again bounced off after contacting. The closing bounce is an important parameter of the mechanical characteristic of the circuit breaker, and in the closing bounce process, the contact is short in disconnection distance, electric arcs cannot be extinguished, so that the electrical wear of the contacts is aggravated, and the service life of the circuit breaker is influenced. The high-current circuit breaker has relatively large mechanism energy, and is more prone to generate the situation of overlarge closing bounce, so the design of the circuit breaker is more required to be controlled.

Therefore, on the premise of ensuring the breaking capacity of the circuit breaker, realizing the zero-bounce of the closing of the circuit breaker is always the research direction in the field of alternating current and direct current switches.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides an inertia damping device of a high-current quick circuit breaker, which reduces the speed of a moving contact of the circuit breaker at the closing moment of the moving contact on the premise of ensuring the breaking capacity of the circuit breaker, ensures that a contact of the circuit breaker is closed more smoothly, reduces vibration, increases the mechanical wear resistance of the circuit breaker, reduces or even eliminates the closing bounce of the circuit breaker, and is favorable for prolonging the service life and improving the reliability of a switch.

The technical scheme adopted by the invention for solving the technical problems is as follows: an inertia damping device of a high-current quick circuit breaker comprises a gear reducer, a braking device, a braking disc device and a transmission shaft; the gear reducer consists of a bottom plate, an upper plate, a driving gear, an intermediate gear and a driven gear, wherein the driving gear, the intermediate gear and the driven gear are assembled between the bottom plate and the upper plate and are mutually meshed to form three-stage gear transmission; the braking device consists of a lever assembled on the positioning shaft, a roller arranged at one end of the lever and a braking piece fixed at the other end of the lever through a shaft pin, wherein a compression spring is connected to the end, close to the roller, of the lever, the other end of the compression spring is connected with an upper plate through a fixed block, and the compression spring provides braking force for the braking piece so that the braking piece is in contact with and locked with the surface of the braking plate; the brake disc device consists of a brake disc assembled on the driven gear and a counterweight disc arranged on the brake disc; the transmission shaft is provided with a cam and a sector gear, the sector gear is meshed with the driving gear, and power is provided for the brake disc device through three-stage gear transmission.

The inertia damping device of the high-current quick circuit breaker is characterized in that an upper plate and a bottom plate of the inertia damping device are supported by a middle pillar.

The inertia damping device of the high-current quick circuit breaker is characterized in that a plurality of counterweight plates are arranged and fastened on a brake disc through anti-loosening gaskets and fastening screws.

The invention has the beneficial effects that: when the breaker is closed, part of kinetic energy of the closing energy storage spring is used for pushing the three-level gear of the speed reducer to transmit, the braking moment is formed when the cam is led in from the roller by the spring when the breaker is closed, the brake disc starts to brake, the rotating torque of the speed reducer is transmitted to the brake disc device with larger mass, the speed of the moving contact of the breaker is reduced in the closing moment of the moving contact of the breaker, the contact of the breaker is closed gently, the mechanical wear resistance of the breaker is increased, and meanwhile, the purpose of reducing or even eliminating the closing bounce of the breaker is achieved.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic structural view of a brake disc assembly of the present invention;

FIG. 3 is a schematic structural view of a brake apparatus and a brake disc apparatus according to the present invention;

fig. 4 is a schematic view of the structure of the gear reducer of the present invention.

The figures are numbered: 1-protective cover plate, 2-gear reducer, 21-driving gear, 22-intermediate gear, 23-driven gear, 24-bottom plate, 25-upper plate, 26-pillar, 27-positioning shaft, 3-brake device, 31-roller, 32-lever, 33-shaft pin, 34-brake piece, 4-transmission shaft, 41-cam, 42-sector gear, 5-compression spring, 6-brake disc device, 61-brake disc, 62-counterweight disc, 63-anti-loose pad.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, the invention discloses an inertia damping device of a high-current fast circuit breaker, comprising a gear reducer 2, a braking device 3, a brake disc device 6, a transmission shaft 4, a compression spring 5 and a protective cover plate 1.

As shown in fig. 4, the gear reducer 2 is composed of a bottom plate 24, a driving gear 21, an intermediate gear 22, a driven gear 23, an upper plate 25, a pillar 26 and a positioning shaft 27, the positioning shaft 27 is welded and fixed on the upper plate 25, the driving gear 21, the intermediate gear 22 and the driven gear 23 are meshed with each other, assembled between the bottom plate 24 and the upper plate 25 and supported by the pillar 26 to form three-stage gear transmission, a shield plate 1 is fixed on the bottom plate 24, and the shield plate 1 provides a shielding effect for the gear reducer 2 and the brake disc device 6.

As shown in fig. 2, the braking device 3 is composed of a braking piece 34, a lever 32, a shaft pin 33 and a roller 31, wherein the braking piece 34 is fixed on the lever 32 through the shaft pin 33 and can flexibly rotate; the lever 32 is connected with a compression spring 5, the other end of the compression spring 5 is connected with the upper plate 25 through a fixed block, and the compression spring 5 provides braking force for the brake pad 34, so that the brake pad 34 is in surface contact with the brake disc 61 and is locked.

As shown in fig. 3, the brake disc device 6 is assembled on the driven gear 23 of the gear reducer 2, fastened by the anti-loosening gasket 63 and the fastening screw, driven by the driven gear 23, and composed of a brake disc 61, a counterweight disc 62 and the anti-loosening gasket 63, the counterweight disc 62 is fastened on the brake disc 61 by the anti-loosening gasket 63 and the fastening screw, and two ends of the anti-loosening gasket are bent, the narrow end is downward, the wide end is upward wrapped by a bolt, so that the brake disc device 6 can be prevented from being loosened due to overlarge stress and connected with the gear; the transmission shaft 4 consists of a cam 41 and a sector gear 42.

Further, the brake disk device 6 includes a brake disk 61 and a weight disk 62 having high wear resistance and has a large mass. The number of weight plates 62 can be adjusted appropriately for better damping and braking.

In the energy storage process of the circuit breaker, the energy storage spring is stretched to store energy, and meanwhile, the cam 41 on the transmission shaft 4 presses the roller 31 on the braking device 3 when rotating, so that the lever 32 rotates around the positioning shaft 27, the compression spring 5 is compressed to store energy, and the brake pad 34 is separated from the brake disc 61; meanwhile, the sector gear 42 on the rotating shaft 4 drives the three-stage gear consisting of the driving gear 21, the intermediate gear 22 and the driven gear 23 to rotate, and the brake disc device 6 connected with the driven gear 23 rotates along with the driven gear 23 after being separated from the brake pads 34.

Further, when the circuit breaker is closed, the operating mechanism is closed, the closing energy storage spring is released instantly, the cam 41 on the transmission shaft 4 is separated from the roller 31 on the braking device 3, part of kinetic energy of the closing energy storage spring is used for pushing the three-level gear transmission of the speed reducer, the rotating torque of the speed reducer is transmitted to the brake disc device 6 with larger mass, meanwhile, the compression spring 5 releases energy, power is provided for the brake disc 34 and the brake disc 61 to be locked again, the braking and damping effects are achieved, the speed of the contact of the circuit breaker is reduced instantly when the circuit breaker is closed, the contact is closed smoothly, and therefore the purposes of reducing vibration, increasing the mechanical wear resistance of the circuit breaker and reducing or even eliminating the.

In conclusion, the invention has the advantages of simple structure and convenient installation, simultaneously reduces the vibration of the circuit breaker during closing, increases the mechanical wear resistance of the circuit breaker, realizes the reduction and even elimination of the closing bounce of the circuit breaker, and is beneficial to improving the service life and the reliability of the circuit breaker.

The above-described embodiments are merely illustrative of the principles and effects of the present invention, and some embodiments may be applied, and it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the inventive concept of the present invention, and these embodiments are within the scope of the present invention.