阅读说明：本技术 一种直流断路器防振动冲击的快速脱扣机构 (Quick tripping mechanism for preventing vibration impact of direct current circuit breaker ) 是由 何谦 傅浪 李宝明 吴雄彪 万子义 杨鹏 于 2021-04-19 设计创作，主要内容包括：本发明公开了一种断路器防振动冲击的快速脱扣机构,包括静触头、动触头、动触头杆、弹簧机构、挂钩、脱扣轴、转动杆及脉冲脱扣装置；静触头的一端固定在断路器的机架上,另一端与动触头接触或断开；动触头固定在动触头杆的一端,脱扣轴固定在动触头杆的另一端,且动触头杆与断路器的机架铰链连接；弹簧机构的一端与断路器的机架铰链连接,另一端与动触头杆转动连接；挂钩的一端与脱扣轴搭扣连接,且挂钩在与脱扣轴连接的一端向外延伸,并与脉冲脱扣装置的位置对应；挂钩的另一端与转动杆的一端转动连接,转动杆的另一端与断路器的机架铰链连接。本发明缩短了快速断路器的固有分闸时间,同时大大提高了断路器的运行可靠性。(The invention discloses a quick tripping mechanism for preventing vibration and impact of a circuit breaker, which comprises a fixed contact, a movable contact rod, a spring mechanism, a hook, a tripping shaft, a rotating rod and a pulse tripping device, wherein the fixed contact is fixed on the movable contact rod; one end of the static contact is fixed on a frame of the circuit breaker, and the other end of the static contact is in contact with or disconnected with the moving contact; the moving contact is fixed at one end of a moving contact rod, the trip shaft is fixed at the other end of the moving contact rod, and the moving contact rod is hinged with a frame of the circuit breaker; one end of the spring mechanism is connected with a frame hinge of the circuit breaker, and the other end of the spring mechanism is rotationally connected with the movable contact rod; one end of the hook is connected with the tripping shaft by a hasp, and the hook extends outwards at the end connected with the tripping shaft and corresponds to the pulse tripping device; the other end of the hook is rotatably connected with one end of the rotating rod, and the other end of the rotating rod is connected with a frame hinge of the circuit breaker. The invention shortens the inherent brake-separating time of the quick circuit breaker and greatly improves the operation reliability of the circuit breaker.)

1. A quick tripping mechanism for direct current breaker vibration impact is characterized by comprising a static contact (1), a moving contact (2), a moving contact rod (3), a spring mechanism (4), a hook (5), a tripping shaft (6), a rotating rod (7) and a pulse tripping device (8);

the static contact (1) is fixed on a frame of the circuit breaker, and a static contact blade (11) is welded at the front end of the static contact;

the moving contact (2) is fixedly welded at one end of the moving contact rod (3), the trip shaft (6) is fixed at the other end of the moving contact rod (3), and the moving contact rod (3) is rotatably connected with a rack of the circuit breaker through a rotating shaft;

one end of the spring mechanism (4) is hinged with a frame of the circuit breaker, and the other end of the spring mechanism is rotationally connected with the movable contact rod (3) through a rotating shaft;

one end of the hook (5) is in hasp connection with the tripping shaft (6), and the hook (5) extends outwards at the end connected with the tripping shaft (6) and corresponds to the pulse tripping device (8); the other end of the hook (5) is rotatably connected with one end of the rotating rod (7), and the other end of the rotating rod (7) is hinged with a rack of the circuit breaker;

the pulse tripping device (8) is used for jacking the hook (5), so that the hook (5) is separated from the tripping shaft (6), and further the static contact (1) and the moving contact (2) are separated under the action of the elastic force of the spring mechanism (4), so that tripping and brake opening of the circuit breaker are realized.

2. The direct current breaker vibration impact preventing quick release mechanism according to claim 1, wherein the pulse release device (8) comprises a limit frame (81), a vortex repulsion copper disc (82), a pulse coil (83), an iron core (84), a reset spring (85), a release push rod (86) and a guide bearing (87);

the limiting frame (81) is fixed on a rack of the circuit breaker, and a guide bearing (87) is arranged on the limiting frame (81);

the pulse coil (83) and the iron core (84) are fixed on a frame of the circuit breaker;

the tripping ejector rod (86) is connected with the eddy current repulsion copper disc (82) in an interference fit manner and can linearly move up and down along the guide bearing (87);

the reset spring (85) is sleeved on the tripping ejector rod (86), the upper end of the reset spring is limited by the limiting frame (81), and the lower end of the reset spring is limited by the vortex repulsion copper plate (82);

after pulse current is introduced into the pulse coil (83), the eddy repulsion copper disc (82) and the tripping ejector rod (86) can move upwards quickly by overcoming the resistance of the spring under the action of eddy repulsion, and the hook (5) is jacked up.

3. The direct current breaker rapid trip mechanism for preventing vibration and impact according to claim 1, wherein the spring mechanism (4) comprises a first connection end (41), a second connection end (42), a sliding rod (44) and a compression spring (43);

the first connecting end (41) is rotationally connected with the movable contact rod (3), and the second connecting end (42) is rotationally connected with a rack of the circuit breaker through a rotating shaft;

the compression spring (43) is sleeved on the sliding rod (44), and the front end and the rear end of the compression spring are limited by the first connecting end (41) and the second connecting end (42) respectively;

the sliding rod (44) is connected with the first connecting end (41) in an interference fit mode, a slide way is arranged in the middle of the second connecting end (42), and the sliding rod (44) can slide on the slide way.

Technical Field

The invention relates to the field of switching devices, in particular to a quick tripping mechanism for preventing vibration and impact of a direct current circuit breaker.

Background

The circuit breaker refers to a switching device capable of closing, carrying and breaking a current under a normal circuit condition and closing, carrying and breaking a current under an abnormal circuit condition within a specified time. In a rail transit traction power supply system, a circuit breaker is used for ensuring the safe operation of the power supply system. Under the condition of an abnormal loop, the breaking time of the circuit breaker can directly influence the time for the traction power supply equipment to bear fault current, and the circuit breaker is required to start rapid brake-breaking response in a short time for protecting the safety of the power supply equipment under the abnormal condition. Generally, in order to shorten the intrinsic opening time of the circuit breaker, the mechanical buckle depth of the circuit breaker is only 1 to 2mm, and due to the small mechanical buckle depth, the circuit breaker is easy to generate false tripping action in a vibration impact operating environment (such as a locomotive, a ship and the like), and the closing reliability of the circuit breaker is reduced.

In order to solve the above problems, the present invention aims to provide a rapid tripping structure for preventing vibration and impact of a dc circuit breaker, which can not only meet the requirement of rapid tripping of the circuit breaker, but also prevent false tripping action caused by vibration and impact environment, and improve the action reliability of the circuit breaker.

Disclosure of Invention

In order to solve the problems in the background art, the present invention provides a quick release mechanism for preventing a direct current circuit breaker from vibration and impact.

In order to achieve the purpose, the invention adopts the technical scheme that:

a rapid tripping mechanism for preventing vibration and impact of a direct current circuit breaker comprises a fixed contact, a movable contact rod, a spring mechanism, a hook, a tripping shaft, a rotating rod and a pulse tripping device;

the static contact is fixed on a frame of the circuit breaker, and a static contact blade is welded at the front end of the static contact;

the moving contact is welded and fixed at one end of the moving contact rod, the trip shaft is fixed at the other end of the moving contact rod, and the moving contact rod is rotatably connected with a rack of the circuit breaker through a rotating shaft;

one end of the spring mechanism is hinged with a frame of the circuit breaker, and the other end of the spring mechanism is rotatably connected with the movable contact rod through a rotating shaft;

one end of the hook is connected with the tripping shaft in a buckling manner, and the hook extends outwards at one end connected with the tripping shaft and corresponds to the pulse tripping device; the other end of the hook is rotatably connected with one end of the rotating rod, and the other end of the rotating rod is hinged with a rack of the circuit breaker;

the pulse tripping device is used for jacking the hook, so that the hook is separated from the tripping shaft, and further the static contact and the moving contact are separated under the action of the elastic force of the spring mechanism, and tripping and opening of the circuit breaker are realized.

In some embodiments, the pulse tripping device comprises a limit frame, a vortex repulsion copper disc, a pulse coil, an iron core, a reset spring, a tripping ejector rod and a guide bearing;

the limiting frame is fixed on a rack of the circuit breaker, and a guide bearing is arranged on the limiting frame;

the pulse coil and the iron core are fixed on a frame of the circuit breaker;

the tripping ejector rod is connected with the eddy current repulsion copper disc in an interference fit manner and can move up and down along the guide bearing in a linear manner;

the reset spring is sleeved on the tripping ejector rod, the upper end of the reset spring is limited by the limiting frame, and the lower end of the reset spring is limited by the vortex repulsion copper disc;

after the pulse coil is connected with pulse current, eddy current is induced in the eddy current repulsion copper plate, and the eddy current repulsion copper plate and the tripping ejector rod can move upwards quickly to jack the hook by overcoming the resistance of the spring under the action of eddy current repulsion.

In some embodiments, the spring mechanism comprises a first connection end, a second connection end, a sliding rod, and a compression spring;

the first connecting end is rotationally connected with the movable contact rod, and the second connecting end is rotationally connected with a rack of the circuit breaker through a rotating shaft;

the compression spring is sleeved on the sliding rod, and the front end and the rear end of the compression spring are limited by the first connecting end and the second connecting end respectively;

the sliding rod is connected with the first connecting end in an interference fit mode, a slide way is arranged in the middle of the second connecting end, and the sliding rod can slide on the slide way.

Compared with the prior art, the invention has the beneficial effects that:

according to the rapid tripping mechanism for preventing the vibration impact of the direct current circuit breaker, the pulse tripping device directly acts on the hook and the tripping shaft without a middle linkage structure, the action stroke is short, and the circuit breaker can realize rapid tripping and brake separating under the condition of an abnormal loop; the latch depth of the hook and the trip shaft is 5-7mm, and the latch is locked by the spring mechanism, so that the false tripping action of the circuit breaker caused by the vibration impact environment can be effectively prevented, the false tripping rate of the circuit breaker is reduced, and the operation reliability of the circuit breaker equipment is improved.

Drawings

Fig. 1 is a schematic diagram of a quick trip mechanism of a circuit breaker provided by the invention in a closing state of the circuit breaker;

fig. 2 is a schematic diagram of the quick release mechanism in fig. 1 before tripping and opening of the circuit breaker are completed;

fig. 3 is a schematic diagram of the quick release mechanism in fig. 1 after tripping and opening of the circuit breaker are completed;

fig. 4 is a schematic diagram of the pulse trip device of fig. 1;

FIG. 5 is a schematic view of the spring mechanism of FIG. 1;

description of reference numerals:

1. static contact; 2. a moving contact; 3. a movable contact rod; 4. a spring mechanism; 5. hooking; 6. tripping the shaft; 7. rotating the rod; 8. a pulse trip device; 11. a stationary contact blade 41, a first connection end; 42. a second connection end; 43. a compression spring; 44. a slide bar; 81. a limiting frame; 82. a vortex repulsion copper disk; 83. a pulse coil; 84. an iron core; 85. a return spring; 86. tripping the ejector rod; 87. and a guide bearing.

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the following description further explains how the invention is implemented by combining the attached drawings and the detailed implementation modes.

Referring to fig. 1-3, the invention provides a quick tripping mechanism of a circuit breaker, which comprises a static contact 1, a moving contact 2, a moving contact rod 3, a spring mechanism 4, a hook 5, a tripping shaft 6, a rotating rod 7 and a pulse tripping device 8; the static contact 1 is fixed on a frame of the circuit breaker, and the front end of the static contact is welded with a static contact blade which is contacted with or disconnected from the moving contact 2; the moving contact 2 is welded and fixed at one end of a moving contact rod 3, the trip shaft 6 is fixed at the other end of the moving contact rod 3, and the moving contact rod 3 is rotatably connected with a frame of the circuit breaker; one end of the spring mechanism 4 is hinged with a frame of the circuit breaker, and the other end is rotatably connected with the movable contact rod 3; one end of the hook 5 is connected with the tripping shaft 6 in a hasp mode, and the hook 5 extends outwards at the end connected with the tripping shaft 6 and corresponds to the pulse tripping device 8 in position; the other end of the hook 5 is rotatably connected with one end of a rotating rod 7, and the other end of the rotating rod 7 is hinged with a rack of the circuit breaker; the pulse tripping device 8 is used for jacking the hook 5, so that the hook 5 is separated from the tripping shaft 6, and further the static contact 1 and the moving contact 2 are separated under the action of the elastic force of the spring mechanism 4, and tripping and opening of the circuit breaker are realized.

With further reference to fig. 4, the pulse tripping device 8 includes a limit frame 81, a copper disc 82 for eddy current repulsion, a pulse coil 83, an iron core 84, a return spring 85, a tripping ejector rod 86 and a guide bearing 87. The limiting frame 81 is fixed on a frame of the circuit breaker, and a guide bearing 87 is arranged on the limiting frame 81; the pulse coil 83 and the iron core 84 are fixed on the frame of the circuit breaker; the tripping ejector rod 86 is connected with the eddy current repulsion copper disc 82 in an interference fit manner and can move up and down linearly along the guide bearing 87; the reset spring 85 is sleeved on the tripping ejector rod 86, the upper end of the reset spring is limited by the limiting frame 81, and the lower end of the reset spring is limited by the vortex repulsion copper plate 82; after the pulse coil 83 is connected with pulse current, eddy current is induced in the eddy current repulsion copper plate 82, and the eddy current repulsion copper plate 82 and the tripping ejector rod 86 can rapidly move upwards to jack the hook 5 by overcoming the resistance of the spring under the action of eddy current repulsion.

With further reference to fig. 5, the spring mechanism 4 includes a first connection end 41, a second connection end 42, a slide rod 44, and a compression spring 43; the first connecting end 41 is rotationally connected with the movable contact rod 3, and the second connecting end 42 is rotationally connected with the frame of the circuit breaker through a rotating shaft; the compression spring 43 is sleeved on the sliding rod 44, and the front end and the rear end are respectively limited by the first connecting end 41 and the second connecting end 42; the sliding rod 44 is connected with the first connecting end 41 in an interference fit manner, a slideway is arranged in the middle of the second connecting end 42, and the sliding rod 44 can slide on the slideway.

The working principle of the quick tripping mechanism of the circuit breaker provided by the invention is as follows:

switching off to switching on: the rotating torque M is applied to the rotating rod 7, the rotating rod 7 drives the hook 5 to rotate anticlockwise, the hook 5 is connected with the tripping shaft 6 in a buckled mode, the depth of the buckled mode is 5-7mm, the hook 5 rotates anticlockwise to drive the lower end of the movable contact rod 3 to move towards the stress direction, the middle of the movable contact rod 3 is connected with the circuit breaker frame in a hinged mode, the lower end of the movable contact rod 3 moves towards the stress direction, the upper end of the movable contact rod 3 moves towards the opposite direction, the movable contact 2 is welded on the movable contact rod 3, the upper end of the movable contact rod 3 moves to drive the movable contact 2 to move towards the direction of the fixed contact 1, the movable contact and the fixed contact are in contact, and the circuit breaker is switched on. At this time, the compression spring 43 in the spring mechanism 4 is compressed and deformed to generate a spring force, which provides a closing pressing force to the moving and stationary contacts and maintains the balance of the entire mechanism force system.

From closing to opening: when the power supply loop of the circuit breaker is abnormal, pulse current excitation is applied to the pulse coil 83, instantaneous annular eddy current is induced in the eddy current repulsion copper disc 82, the direction of the excitation current of the pulse coil is opposite to that of the induced eddy current, huge electromagnetic repulsion is generated, the eddy current repulsion copper disc 82 and the tripping ejector rod 86 are pushed to rapidly move upwards, the hook 5 is impacted by the tripping ejector rod 86 and separated from the tripping shaft 6 through a hasp, the compression spring 44 is released, under the action of spring force, the movable contact rod 3 rotates anticlockwise and rapidly moves, the movable contact 2 is driven to move in the direction far away from the fixed contact 1, and rapid tripping and brake separating of the circuit breaker are achieved. Meanwhile, after the pulse current excitation is finished, the induced eddy current in the eddy current repulsion copper disc 82 disappears, and the eddy current repulsion copper disc 82 and the tripping top 86 move downwards to reset under the triple actions of the impact force of the hook 5, the gravity of the eddy current repulsion copper disc 82 and the tripping top rod 86 and the spring force of the reset spring 85.

After the breaker is switched on, when the operating environment of the breaker has a vibration impact working condition, because the hasp depth of the breaker hook 5 and the tripping shaft 6 is larger, and the moving mechanism of the breaker is locked by the spring force of the spring mechanism, the whole structural force system is balanced and stable, and the breaker can not generate false tripping action; meanwhile, under the action of the downward precompression force of the return spring 85, when the pulse coil 83 is not sent with pulse excitation current, the eddy repulsion copper disc 82 and the tripping ejector rod 86 cannot generate tripping stroke and tripping force for tripping the hook 5 and the tripping shaft 6 due to vibration impact environment.

In conclusion, according to the rapid tripping mechanism of the circuit breaker, the pulse tripping device directly acts on the locking structure of the circuit breaker, so that action delay caused by a middle interlocking mechanism is avoided, the action stroke is short, and the inherent opening time of the rapid circuit breaker is shortened; meanwhile, due to the design of enough mechanical locking amount and the elastic mechanism, the circuit breaker can be prevented from being tripped mistakenly under the vibration impact environment, and the operation reliability of the circuit breaker is greatly improved.

Finally, the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, which should be covered by the claims of the present invention.