阅读说明：本技术 一种断路器的过载电流脱扣装置 (Overload current tripping device of circuit breaker ) 是由 王金龙 李宝明 陈程 徐银飞 吴飞 罗宽 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的过载电流脱扣装置,包括导磁框、三角导磁块、撞击杆、固定板、压缩弹簧、止位套筒和触发板；导磁框的中部设有矩形开口,用于供断路器的载流铜排穿过；导磁框的顶部中间设有倒三角形开口,用于设置三角导磁块；固定板和止位套筒设置于三角导磁块的顶端,固定板和止位套筒用于对三角导磁块进行限位；压缩弹簧的顶端固定在三角导磁块的底端,压缩弹簧的底端固定在导磁框上；撞击杆的顶端固定设置在三角导磁块的一侧；触发板为杠杆结构,且触发板的一端与撞击杆的底端的位置对应,另一端与断路器的脱扣弯钩的位置对应；导磁框和三角导磁块均由顺磁材料制成。(The invention discloses an overload current tripping device of a circuit breaker, which comprises a magnetic conduction frame, a triangular magnetic conduction block, a striking rod, a fixing plate, a compression spring, a stop sleeve and a trigger plate, wherein the striking rod is fixed on the fixing plate; the middle part of the magnetic conduction frame is provided with a rectangular opening for a current-carrying copper bar of the circuit breaker to pass through; the middle of the top of the magnetic conduction frame is provided with an inverted triangular opening for arranging a triangular magnetic conduction block; the fixing plate and the stop sleeve are arranged at the top end of the triangular magnetic conduction block and used for limiting the triangular magnetic conduction block; the top end of the compression spring is fixed at the bottom end of the triangular magnetic conduction block, and the bottom end of the compression spring is fixed on the magnetic conduction frame; the top end of the striking rod is fixedly arranged on one side of the triangular magnetic conduction block; the trigger plate is of a lever structure, one end of the trigger plate corresponds to the bottom end of the impact rod, and the other end of the trigger plate corresponds to the tripping hook of the circuit breaker; the magnetic conduction frame and the triangular magnetic conduction block are both made of paramagnetic materials.)

1. An overload current tripping device of a circuit breaker is characterized by comprising a magnetic conduction frame (1), a triangular magnetic conduction block (2), a striking rod (4), a fixed plate (5), a compression spring (6), a stop sleeve (9) and a trigger plate (14);

the middle part of the magnetic conduction frame (1) is provided with a rectangular opening for a current-carrying copper bar of the circuit breaker to pass through;

an inverted triangular opening is formed in the middle of the top of the magnetic conduction frame (1) and used for arranging the triangular magnetic conduction block (2);

the fixing plate (5) and the stopping sleeve (9) are arranged at the top end of the triangular magnetic conduction block (2), and the fixing plate (5) and the stopping sleeve (9) are used for limiting the triangular magnetic conduction block (2);

the top end of the compression spring (6) is fixed at the bottom end of the triangular magnetic conduction block (2), and the bottom end of the compression spring (6) is fixed on the magnetic conduction frame (1);

the top end of the impact rod (4) is fixedly arranged on one side of the triangular magnetic conduction block (2);

the trigger plate (14) is of a lever structure, one end of the trigger plate (14) corresponds to the bottom end of the impact rod (4), and the other end of the trigger plate corresponds to the tripping hook of the circuit breaker;

the magnetic conduction frame (1) and the triangular magnetic conduction block (2) are both made of paramagnetic materials.

2. The overcurrent trip device of the circuit breaker according to claim 1, further comprising a current adjusting block (3), wherein a round hole is formed in a side surface of the magnetic conduction frame (1) for placing the current adjusting block (3); the current adjusting block (3) is used for adjusting the size of the expected tripping current value of the circuit breaker.

3. The overcurrent trip apparatus of the circuit breaker according to claim 1, further comprising a spring guide bar (8), a first linear bearing (10), a positioning slide bar (11), a second linear bearing (12), and a positioning bent plate (13);

the spring guide rod (8) and the positioning slide rod (11) penetrate through the triangular magnetic conduction block (2), the spring guide rod (8) is located on the inner side of the compression spring (6), and the positioning slide rod (11) and the impact rod (4) are located on two opposite sides of the triangular magnetic conduction block (2) respectively;

the triangular magnetic conduction block (2) is provided with a first linear bearing (10) and a second linear bearing (12) with self-lubricating function, and the first linear bearing (10) and the second linear bearing (12) are respectively connected with the spring guide rod (8) and the positioning slide rod (11) in a sliding manner;

the positioning bent plate (13) is fixed on the magnetic conduction frame (1), a positioning hole is formed in the positioning bent plate (13), and the impact rod (4) penetrates through the positioning hole.

4. The overcurrent trip device of the circuit breaker according to claim 3, further comprising a setting current scale adjustment device (7) provided at a lower end of the magnetically conductive frame (1) for setting an initial compression amount of the compression spring (6).

5. The overload current trip apparatus for a circuit breaker according to claim 4, wherein the set current scale adjustment apparatus (7) comprises a threaded sleeve (71), a large bevel gear (72), a small bevel gear (73), a worm (74), a worm wheel (75) and a dial (76);

the spring guide rod (8) is provided with threads and is connected with the threaded sleeve (71) in a screw pair manner;

the large bevel gear (72) is connected with the threaded sleeve (71) through a flat key;

the small bevel gear (73) is fixedly connected with the worm (74);

the small bevel gear (73) is meshed with the large bevel gear (72), and the worm wheel (75) is meshed with the worm (74);

the turbine (75) is fixedly connected with the dial (76);

the worm (74) is provided with a hexagonal square hole which is used for being matched with an external hexagonal wrench (15) for a user to operate.

Technical Field

The invention relates to the field of switching devices, in particular to an overload current tripping device of a 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.

The circuit breaker is used as a protection element of a power supply loop, and a plurality of tripping devices including shunt tripping, indirect tripping, undervoltage tripping, overload tripping and the like are arranged for improving the reliability of protection. The overload tripping device is used as a basic tripping device of the circuit breaker, and when the current value or the rising rate of a protected circuit exceeds a preset value, the tripping device is triggered to realize the opening operation of the circuit breaker. It is not restricted by the control loop of the breaker, and is a device directly acting on tripping. At present, in a direct-current traction power supply system, an overload tripping device of a main current is influenced by a disc spring variable stiffness characteristic, a movement structure and a setting current scale adjusting device, a setting tripping current value is extremely unstable, and the phenomenon of setting current value drifting often occurs.

Disclosure of Invention

In order to solve the problems of the background art, the present invention provides an overload current trip apparatus for a circuit breaker.

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

an overload current tripping device of a circuit breaker comprises a magnetic conduction frame, a triangular magnetic conduction block, a striking rod, a fixing plate, a compression spring, a stop sleeve and a trigger plate;

the middle part of the magnetic conduction frame is provided with a rectangular opening for a current-carrying copper bar of the circuit breaker to pass through;

an inverted triangular opening is formed in the middle of the top of the magnetic conduction frame and used for arranging the triangular magnetic conduction block;

the fixing plate and the stop sleeve are arranged at the top end of the triangular magnetic conduction block and used for limiting the triangular magnetic conduction block;

the top end of the compression spring is fixed at the bottom end of the triangular magnetic conduction block, and the bottom end of the compression spring is fixed on the magnetic conduction frame;

the top end of the striking rod is fixedly arranged on one side of the triangular magnetic conduction block;

the trigger plate is of a lever structure, one end of the trigger plate corresponds to the bottom end of the impact rod, and the other end of the trigger plate corresponds to the tripping hook of the circuit breaker;

the magnetic conduction frame and the triangular magnetic conduction block are both made of paramagnetic materials.

In some embodiments, the magnetic conduction frame further comprises a current adjusting block, and a round hole is formed in the side surface of the magnetic conduction frame and used for placing the current adjusting block; the current adjusting block is used for adjusting the size of the expected tripping current value of the circuit breaker.

In some embodiments, the device further comprises a spring guide rod, a first linear bearing, a positioning slide rod, a second linear bearing and a positioning bent plate;

the spring guide rod and the positioning slide rod penetrate through the triangular magnetic conduction block, the spring guide rod is positioned on the inner side of the compression spring, and the positioning slide rod and the impact rod are respectively positioned on two opposite sides of the triangular magnetic conduction block;

the triangular magnetic conduction block is provided with a first linear bearing and a second linear bearing which have self-lubricating function, and the first linear bearing and the second linear bearing are respectively connected with the spring guide rod and the positioning slide rod in a sliding manner;

the positioning bent plate is fixed on the magnetic conduction frame, a positioning hole is formed in the positioning bent plate, and the impact rod penetrates through the positioning hole.

In some embodiments, the magnetic conduction frame further comprises a setting current scale adjusting device arranged at the lower end of the magnetic conduction frame and used for setting the initial compression amount of the compression spring.

In some embodiments, the setting current scale adjustment device comprises a threaded sleeve, a large bevel gear, a small bevel gear, a worm gear, and a dial;

the spring guide rod is provided with threads and is connected with the threaded sleeve screw pair;

the large bevel gear is connected with the threaded sleeve through a flat key;

the small bevel gear is fixedly connected with the worm;

the small bevel gear is meshed with the large bevel gear, and the worm wheel is meshed with the worm;

the turbine is fixedly connected with the dial;

the worm is provided with a hexagonal square hole which is used for being matched with an external hexagonal wrench for a user to operate.

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

the overload current tripping device of the circuit breaker can quickly realize tripping and brake separating of the circuit breaker when the loop current is abnormal, thereby ensuring the safety of power supply equipment; the compression spring is used as a counterforce mechanism, the rigidity of the counterforce mechanism is stable, and the influence of the variable rigidity characteristic of the disc spring is overcome; the triangular magnetic conduction block is limited by double guide rods and is provided with a bearing with self-lubrication, so that the movement is smooth and the structure is stable; the problem that the setting tripping current value of the overload tripping device of the main current in the direct-current traction power supply system drifts is solved; and the setting current scale adjusting device adopts a bevel gear and worm gear structure, the worm gear has a self-locking characteristic, the stability of the scale can be ensured, meanwhile, the scale adjusting tool adopts a universal outer hexagonal wrench, the operation is simple and convenient, the reliability is high, the scale indication is easy to observe and read, and the user experience is improved.

Drawings

Fig. 1 is a schematic view of an overcurrent trip apparatus of a circuit breaker according to the present invention;

FIG. 2 is a schematic diagram of the magnetic field generated by the magnetic frame and the triangular magnetic blocks;

fig. 3 is a schematic diagram illustrating a tripping principle of the overload current tripping device in fig. 1;

FIG. 4 is a side cross-sectional view of a portion of the structure of FIG. 1;

FIG. 5 is an installation schematic diagram of a setting current scale adjustment device;

FIG. 6 is a front view of a setting current scale adjustment apparatus;

FIG. 7 is a side view of a setting current scale adjustment apparatus;

fig. 8 is a schematic view of an operation using an external hexagonal wrench.

Description of reference numerals:

1. a magnetic conduction frame; 2. a triangular magnetic conduction block; 3. a current adjustment block; 4. a striker bar; 5. a fixing plate; 6. a compression spring; 7. setting a current scale adjusting device; 8. a spring guide rod; 9. a stop sleeve; 10. a first linear bearing; 11. positioning the slide bar; 12. a second linear bearing; 13. positioning a bent plate; 14. a trigger plate; 15. an outer hexagonal wrench; 71. a threaded sleeve; 72. a large bevel gear; 73. a bevel pinion gear; 74. a worm; 75. a turbine; 76. a dial scale; I. and a current-carrying copper bar.

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 to 4, the invention provides an overcurrent trip device of a circuit breaker, which comprises a magnetic conduction frame 1, a triangular magnetic conduction block 2, a striking rod 4, a fixing plate 5, a compression spring 6, a stop sleeve 9 and a trigger plate 14. The middle part of the magnetic conduction frame 1 is provided with a rectangular opening for a current-carrying copper bar of the circuit breaker to pass through; the middle of the top of the magnetic conduction frame 1 is provided with an inverted triangle opening for arranging a triangle magnetic conduction block 2; the fixing plate 5 and the stopping sleeve 9 are arranged at the top end of the triangular magnetic conduction block 2, and the fixing plate 5 and the stopping sleeve 9 are used for limiting the triangular magnetic conduction block 2; the top end of the compression spring 6 is fixed at the bottom end of the triangular magnetic conduction block 2, and the bottom end of the compression spring 6 is fixed on the magnetic conduction frame 1; the top end of the striking rod 4 is fixedly arranged on one side of the triangular magnetic conduction block 2; the trigger plate 14 is of a lever structure, one end of the trigger plate 14 corresponds to the bottom end of the impact rod 4, and the other end of the trigger plate corresponds to the tripping hook of the circuit breaker; the magnetic conduction frame 1 and the triangular magnetic conduction block 2 are both made of paramagnetic materials.

The working principle of the overload current tripping device of the circuit breaker provided by the invention is as follows: because the magnetic conduction frame 1 and the triangular magnetic conduction block 2 are made of paramagnetic materials, when a main circuit of the circuit breaker is electrified, a magnetic field corresponding to the current direction is generated along the magnetic conduction frame 1 and the triangular magnetic conduction block 2 on the periphery of a current-carrying copper bar, under the action of an electromagnetic field, the magnetic conduction frame 1 generates downward electromagnetic force on the triangular magnetic conduction block 2, when the current value or the rising rate in the current-carrying copper bar exceeds a preset value, the generated electromagnetic attraction overcomes the spring resistance of a compression spring 6, the triangular magnetic conduction block 2 is forced to move downwards rapidly, the triangular magnetic conduction block 2 is fixedly connected with an impact rod 4, the impact rod 4 is driven by the rapid movement of the triangular magnetic conduction block 2 to impact a trigger plate 14 rapidly downwards, as shown in figure 3, the trigger plate 14 adopts a lever structure, the trigger plate 14 impacts a trip hook of the circuit breaker by utilizing the lever principle to realize rapid trip and brake separation of the circuit breaker, the whole current circuit is cut off, and then, under the action of the spring force, the triangular magnetic conduction block 2 is restored to the original position. The upper end of the triangular magnetic conduction block 2 is provided with a fixing plate 5 and a stop sleeve 9 for limiting the triangular magnetic conduction block, and the stop sleeves 9 with different heights are arranged to change the relative air gap between the triangular magnetic conduction block 2 and the magnetic conduction frame 1 so as to change the motion stroke of the triangular magnetic conduction block.

Preferably, the overload current tripping device further comprises a current adjusting block 3, and a round hole is formed in the side face of the magnetic conduction frame 1 and used for placing the current adjusting block 3; the current adjusting block 3 is used for adjusting the size of the expected tripping current value of the circuit breaker. According to actual needs, the setting current adjusting block 3 can be added or taken out, after the setting current adjusting block 3 is taken out, the magnetic resistance of the whole magnetic conduction loop is increased, the current-carrying capacity of the circuit breaker is the same, the magnetic induction intensity of the magnetic conduction frame 1 is weakened, the magnetic field force generated on the triangular magnetic conduction block 2 is reduced, and if the resistance of the compression spring 6 is overcome, a larger exciting current is needed, so that the expected tripping current value of the circuit breaker is adjusted.

Preferably, the overload current tripping device further comprises a spring guide rod 8, a first linear bearing 10, a positioning slide rod 11, a second linear bearing 12 and a positioning bent plate 13; the spring guide rod 8 and the positioning slide rod 11 penetrate through the triangular magnetic conduction block 2, the spring guide rod 8 is positioned on the inner side of the compression spring 6, and the positioning slide rod 11 and the impact rod 4 are respectively positioned on two opposite sides of the triangular magnetic conduction block 2; the triangular magnetic conduction block 2 is provided with a first linear bearing 10 and a second linear bearing 12 with self-lubricating function, and the first linear bearing 10 and the second linear bearing 12 are respectively connected with the spring guide rod 8 and the positioning slide rod 11 in a sliding manner; the positioning bent plate 13 is fixed on the magnetic conduction frame 1, a positioning hole is formed in the positioning bent plate 13, and the impact rod 4 penetrates through the positioning hole.

Through the arrangement of the first linear bearing 10 and the second linear bearing 12, on one hand, the vertical movement of the triangular magnetic conduction block 2 is smooth without clamping stagnation, and on the other hand, the triangular magnetic conduction block 2 is limited, so that the position stability of the triangular magnetic conduction block 2 can be ensured, and the displacement caused by impact and vibration can be avoided, thereby avoiding the drift of the setting tripping current value.

The adjustment mode of the scheme only has two modes of taking out or putting in the current adjusting block 3, and belongs to step adjustment. If the expected tripping current value of the circuit breaker is to be finely adjusted, the compression amount of the compression spring 6 needs to be adjusted. With further reference to fig. 5-8, preferably, the overload current trip apparatus further includes a setting current scale adjustment device 7 disposed at the lower end of the magnetic conduction frame 1, for setting an initial compression amount of the compression spring 6. The larger the initial compression amount of the compression spring 6 is, the larger the resistance of the compression spring 6 to the triangular magnetic conduction block 2 is, the larger the inrush current required for overcoming the spring resistance is, and the larger the expected tripping current value of the circuit breaker is.

Preferably, the setting current scale adjusting device 7 comprises a threaded sleeve 71, a large bevel gear 72, a small bevel gear 73, a worm 74, a worm wheel 75 and a dial 76; the spring guide rod 8 is provided with threads and is connected with the threaded sleeve 71 through a screw pair; the large bevel gear 72 is connected with the threaded sleeve 71 through a flat key; the small bevel gear 73 and the worm 74 are fixedly connected together; the small bevel gear 73 is intermeshed with the large bevel gear 72, and the worm gear 75 is intermeshed with the worm 74; the turbine 75 is fixedly connected with the dial 76; the worm 74 is provided with a hexagonal square hole for matching with an external hexagonal wrench 15 for operation by a user.

The working principle of the user during operation is as follows: the worm 74 is provided with a hexagonal square hole, the external hexagonal wrench 15 is operated to rotate the worm 74, the worm drives the small bevel gear 73 to rotate, the small bevel gear 73 is in meshing transmission with the large bevel gear 72 to drive the threaded sleeve 71 to spirally ascend or descend along the axial direction of the spring guide rod 8, the up-and-down spiral motion of the threaded sleeve 71 compresses the compression spring 6 to different degrees, and the resistance of the compression spring 6 to the triangular magnetic conduction block 2 is changed accordingly. Meanwhile, when the worm 74 is rotated, the worm wheel 75 is engaged and driven, the worm wheel 75 is fixedly connected with the dial 76, and the engagement and driving of the worm wheel correspond to different indication scales. The indication scale is related to the compression amount of the spring and the expected tripping current value of the circuit breaker, the indication scale under a certain compression amount of the spring is recorded, the tripping current value of the circuit breaker in the state is obtained through a setting test, and the scale value corresponding to the expected tripping current is obtained. When a user needs different expected tripping current values according to the actual circuit operation condition of the circuit breaker, the user only needs to adjust the scales to the positions corresponding to the expected tripping currents. Particularly, the worm gear and the worm have a self-locking function, so that the circuit breaker setting current scale adjusting device is stable in structure and cannot cause vibration displacement due to circuit breaker opening and closing operation impact.

In conclusion, the overload current tripping device of the circuit breaker can quickly realize tripping and brake separating of the circuit breaker when the loop current is abnormal, so that the safety of power supply equipment is ensured; the compression spring is used as a counterforce mechanism, the rigidity of the counterforce mechanism is stable, and the influence of the variable rigidity characteristic of the disc spring is overcome; the triangular magnetic conduction block is limited by double guide rods and is provided with a bearing with self-lubrication, so that the movement is smooth and the structure is stable; the problem that the setting tripping current value of the overload tripping device of the main current in the direct-current traction power supply system drifts is solved; and the setting current scale adjusting device adopts a bevel gear and worm gear structure, the worm gear has a self-locking characteristic, the stability of the scale can be ensured, meanwhile, the scale adjusting tool adopts a universal outer hexagonal wrench, the operation is simple and convenient, the reliability is high, the scale indication is easy to observe and read, and the user experience is 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.