A leakage tripping mechanism for a circuit breaker

Abstract

The present invention relates to a leakage tripping mechanism of a circuit breaker, comprising a circuit breaker housing, a release device and a linkage unit located in the circuit breaker housing, wherein the linkage unit comprises a lever and a pull rod, the lever is hinged in the circuit breaker housing and the two ends respectively form a pull rod toggle end and a release device driving end, the pull rod is slidably arranged in the circuit breaker housing, the release device driving end corresponds to the release device position, the release device can push the release device driving end to make the lever swing, the pull rod is provided with a locking contact surface, the pull rod toggle end can toggle the lever to slide, and also comprises a reset spring for resetting the lever. By adopting the above technical scheme, the present invention provides a leakage tripping mechanism of a circuit breaker, which has a small overall volume, is more convenient to install, and has good stability.

Description

Technical Field

[0001] The invention relates to the field of circuit breakers, and in particular to a leakage tripping mechanism of a circuit breaker. Background Art

[0002] The leakage tripping mechanism of the existing circuit breaker includes a circuit breaker housing, a tripper and a linkage unit located in the circuit breaker housing, wherein the tripper includes a coil, a coil frame, a yoke and an iron core, wherein the coil is wound on the coil frame, the coil frame is cylindrical, the yoke is arranged in a "U" shape, the two opposite sides of the yoke are sleeved on the two ends of the coil frame, the iron core is inserted in the coil frame, a push rod is arranged at one end of the iron core, and an opening for the push rod to enter and exit is arranged on the coil frame. The coil frame of this tripper is large in size and is not convenient to be installed in a small (such as 18mm wide) leakage circuit breaker. Generally, the voltage coil and the current coil share a same iron core to solve the problem. The shared iron core will cause electromagnetic interference, and the iron core spring force will be increased due to the instantaneous action characteristics, thereby causing the voltage coil to not act. When leakage occurs, the iron core drives the circuit breaker lock to swing through the linkage unit to achieve tripping. There are many types of linkage units currently used, but the transmission performance is unstable and the installation is inconvenient. Summary of the invention

[0003] Purpose of the present invention: In order to overcome the defects of the prior art, the present invention provides a leakage tripping mechanism of a circuit breaker, which has a small overall volume, is more convenient to install and has good stability.

[0004] The technical solution of the present invention is: a leakage tripping mechanism of a circuit breaker, comprising a circuit breaker housing and a release and a linkage unit located in the circuit breaker housing, characterized in that: the linkage unit comprises a lever and a pull rod, the lever is hinged in the circuit breaker housing and two ends of the lever respectively form a pull rod toggle end and a release driving end, the pull rod is slidably arranged in the circuit breaker housing, the release can push the release driving end to make the lever swing, a locking contact surface is provided on the lever, the pull rod toggle end can drive the lever to slide, and also includes a reset spring for resetting the lever.

[0005] With the above technical solution, when leakage occurs, the tripper pushes the tripper driving end to make the lever swing, the lever toggling end toggles the lever to slide, and the lock buckle contact surface on the lever pushes the lock buckle to swing to achieve tripping. When working normally, the reset spring resets the lever. This circuit breaker leakage tripping mechanism has a small overall size, is more convenient to install, and has good stability.

[0006] Further configuration of the present invention: the releaser includes a coil, a coil frame, a yoke, and an iron core. The yoke is arranged in a "U" shape, a push rod is arranged at one end of the iron core, and the iron core is arranged in a flat plate shape. The coil frame includes a front end plate and a rear end plate arranged opposite to each other, and a hollow main frame is connected between the front end plate and the rear end plate. The main frame is flat, the iron core is inserted into the main frame, and the coil is wound on the main frame. An opening for the push rod to enter and exit is provided on the front end plate, the bottom edge of the yoke is in contact with the front end surface of the front end plate, and the opposite side edges of the yoke extend toward the rear end plate and are connected to the two sides of the rear end plate. A through hole for the iron core to enter and exit is provided at the corresponding opening position on the bottom edge of the yoke, and the driving end of the releaser corresponds to the position of the push rod.

[0007] By adopting the above-mentioned further arrangement, by setting the iron core to a flat shape and the main frame to a flat shape, the volume of the entire coil skeleton is reduced; furthermore, the connection method of the front end plate, the rear end plate and the yoke makes the overall installation more convenient, and the yoke is surrounded and arranged on the coil, which is beneficial to the enhancement and improvement of the iron core suction force and the stability of the product.

[0008] The present invention is further configured as follows: the circuit breaker housing includes a base, a middle seat and a cover plate which are separately arranged, the middle seat is arranged between the base and the cover plate, the releaser and the linkage unit are arranged between the middle seat and the base, a guide groove is arranged on the base along the sliding direction of the pull rod, a guide rib is arranged on the pull rod towards the side of the base, the guide rib is slidably arranged in the guide groove, a hinge shaft is arranged on the base, a hinge hole is arranged on the push rod, the hinge shaft is passed through the hinge hole, a releaser positioning boss is arranged on the base, and the releaser is fixedly arranged in the positioning boss.

[0009] With the above further arrangement, this installation method of the pull rod and the shift rod has a simple structure, is easy to install, and the pull rod slides stably and the shift rod swings stably.

[0010] The present invention is further configured as follows: a linkage groove is provided on the surface of the pull rod facing the base, and the toggling end of the pull rod extends into the linkage groove.

[0011] By further adopting the above-mentioned setting, the setting of the linkage groove can not only ensure that the toggle end of the pull rod can toggle the pull rod to slide, but also reduce the overall volume; furthermore, the bottom edge of the linkage groove cooperates with the inner wall of the base to prevent the lever from separating from the hinge shaft, which can play a good limiting role for the lever.

[0012] The present invention is further configured that both end surfaces of the linkage groove facing the toggling end of the pull rod are arc surfaces.

[0013] With the above further configuration, the arc surface configuration can make the sliding of the pull rod at the toggle end of the pull rod smoother and less likely to get stuck.

[0014] A further improvement of the present invention: One end of the pull rod extends towards the base and the middle seat respectively with limiting bumps, and on the middle seat, there are ribbed protrusions along the sliding direction of the pull rod at the position of the other end of the pull rod, and the other end of the pull rod is provided with a shoulder step that abuts against the ribbed protrusions.

[0015] With the above further improvement, the two limiting bumps cooperate with the base and the middle seat respectively to limit the pull rod and prevent it from easily slipping out of the guide groove; the shoulder step at the other end of the pull rod abuts against the ribbed protrusions to further ensure the stability of the pull rod sliding and prevent it from tilting.

[0016] A further improvement of the present invention: There is a terminal wiring board on the middle seat, a limiting groove is provided on the side of the terminal wiring board facing the base, and the toggle rod is inserted into the limiting groove; there is a limiting boss on the middle seat, and the toggle rod is close to or abuts against the limiting boss.

[0017] With the above further improvement, the bottom edge of the limiting groove cooperates with the inner wall of the base to further limit the toggle rod; the limiting boss can further limit the position offset of the toggle rod along the hinge axis direction.

[0018] A further improvement of the present invention: There is also a limiting notch on the pull rod, and at the position corresponding to the limiting notch on the base, there is a limiting block that cooperates with the bottom edge of the limiting notch to limit the return position of the pull rod.

[0019] With the above further improvement, the cooperation between the limiting block and the bottom edge of the limiting notch can limit the position of the pull rod when it returns, ensuring the reliability of each action.

[0020] A further improvement of the present invention: The driving end of the release has a positioning boss, there is a positioning piece on the base, two ribbed protrusions are provided on the positioning piece, and a positioning groove is formed between the two ribbed protrusions. One end of the return spring is sleeved on the positioning boss and abuts against the driving end of the release, and the other end abuts inside the positioning groove.

[0021] With the above further improvement, this installation method of the return spring has a simple structure and good stability.

[0022] A further improvement of the present invention: There are four convex blocks forming a rectangle on the front end plate, corresponding notches are provided on the yoke at the positions corresponding to the four convex blocks, and the convex blocks are inserted into the corresponding notches; slots are respectively provided on both sides of the rear end plate, and insertion blocks are respectively provided on the opposite sides of the yoke, and the insertion blocks are inserted into the corresponding slots.

[0023] With the above further improvement, through the corresponding insertion of the four convex blocks and the four notches, the yoke can be well positioned and the installation is also convenient; through the insertion of the insertion blocks and the slots, the opposite sides of the yoke and the rear end plate are inserted, making the overall installation more convenient and the structure simpler. Description of the Drawings

[0024] Figure 1 Overall structure diagram of a specific embodiment of the present invention;

[0025] Figure 2 Internal structure diagram of a specific embodiment of the present invention when there is no leakage;

[0026] Figure 3 Internal structure diagram of a specific embodiment of the present invention when there is leakage;

[0027] Figure 4 Partial structure diagram of the release and linkage unit in a specific embodiment of the present invention;

[0028] Figure 5 Base structure diagram of a specific embodiment of the present invention;

[0029] Figure 6 Middle seat structure diagram of a specific embodiment of the present invention;

[0030] Figure 7 Tie rod structure in a specific embodiment of the present invention Figure 1 ;

[0031] Figure 8 Tie rod structure in a specific embodiment of the present invention Figure 2 ;

[0032] Figure 9 Pawl structure diagram of a specific embodiment of the present invention;

[0033] Figure 10 Locking buckle structure diagram of a specific embodiment of the present invention;

[0034] Figure 11 Terminal connection board structure diagram of a specific embodiment of the present invention;

[0035] Figure 12 Three-dimensional view of the release in a specific embodiment of the present invention;

[0036] Figure 13 Front view of the release in a specific embodiment of the present invention;

[0037] Figure 14 is Figure 13 A - A structural sectional view in;

[0038] Figure 15 Structural diagram of one side of the bottom edge of the yoke in a specific embodiment of the present invention;

[0039] Figure 16 Structural diagram of one side of the yoke wire groove in a specific embodiment of the present invention;

[0040] Figure 17 Three - dimensional of the coil bobbin in a specific embodiment of the present invention Figure 1 ;

[0041] Figure 18 For the three-dimensional coil bobbin in the specific embodiment of the present invention Figure 2 ;

[0042] Figure 19 For the iron core structure diagram in the specific embodiment of the present invention;

[0043] Figure 20 For the structure diagram of the cooperation between the base and the release in the specific embodiment of the present invention. Specific embodiments

[0044] As Figure 1-20 shown, a leakage tripping mechanism of a circuit breaker includes a circuit breaker housing 1 and a release 2 and a linkage unit 3 located inside the circuit breaker housing 1. The circuit breaker housing 1 includes a base 11, a middle seat 12 and a cover plate 13 which are separately arranged. The middle seat 12 is arranged between the base 11 and the cover plate 13. The release 2 and the linkage unit 3 are arranged between the middle seat 12 and the base 11. The base 11, the middle seat 12 and the cover plate 13 are fixed by bolts or rivets or self-thermal riveting. A terminal wiring board 4 is provided on the middle seat 12.

[0045] Among them, the release 2 includes a coil 21, a coil bobbin 22, a yoke 23 and an iron core 24. The yoke 23 is arranged in a "U" shape. One end of the iron core 24 is provided with a push rod 25. The end face 250 of the push rod 25 is arc-shaped, which is beneficial to the reliability and consistency of the thrust. The iron core 24 is arranged in a flat plate shape. The coil bobbin 22 includes a front end plate 221 and a rear end plate 222 which are oppositely arranged. A hollow main frame body 223 is connected between the front end plate 221 and the rear end plate 222. The main frame body 223 is in a flat shape. The iron core 24 is inserted into the main frame body 223. The coil 21 is wound around the main frame body 223. An opening 2210 for the push rod 25 to enter and exit is provided on the front end plate 221. A movable hole 2222 for the iron core 4 to enter and exit is provided on the rear end plate 222. The bottom edge of the yoke 23 is attached to the front end face of the front end plate 221. The opposite two side edges of the yoke 23 extend towards the rear end plate 222 and are connected to both sides of the rear end plate 222. A through hole 2301 for the iron core 24 to enter and exit is provided on the bottom edge 230 of the yoke 23 corresponding to the position of the opening 2210;

[0046] The front end plate 221 is provided with four rectangular protrusions 2211, and the yoke 23 is provided with notches 231 corresponding to the positions of the four protrusions 2211. The protrusions 2211 are inserted into the corresponding notches 231. The front end plate 221 and the rear end plate 222 are both rectangular, and the four protrusions 2211 are located at the four corners of the front end plate 221; slots 2221 are provided on both sides of the rear end plate 222, and plug blocks 232 are provided on the opposite sides of the yoke 23, and the plug blocks 232 are inserted into the corresponding slots 2221. Of course, the opposite sides of the yoke 23 can also be connected to the rear end plate 222 by means of snaps or the like. A wire groove 26 is provided on one of the opposite sides of the yoke 23, so that the coil 21 can be easily connected to the outside, which is convenient for operation;

[0047] The linkage unit 3 includes a lever 31 and a pull rod 32. A guide groove 110 is provided on the base 11. A guide rib 320 is provided on the pull rod 32 facing the base 11. The guide rib 320 is slidably arranged in the guide groove 110. A hinge shaft 111 is provided on the base 11. A hinge hole 310 is provided on the lever 31. The hinge shaft 111 is passed through the hinge hole 310. The two ends of the lever 31 respectively form a pull rod toggle end 311 and a releaser driving end 312. The releaser driving end 312 corresponds to the position of the push rod 25. The push rod 25 can push the releaser driving end 312 to make the lever 31 swing. A lock buckle contact surface 321 is provided on the pull rod 32. The lock buckle 5 is provided with a pull rod contact platform 51. The contact surface 321 is used to contact the pull rod contact platform 51 to push the lock 5 to achieve disengagement. A linkage groove 322 is provided on the surface of the pull rod 32 facing the base 11. The pull rod toggle end 311 extends into the linkage groove 322. The two end surfaces 3220 of the linkage groove 322 facing the pull rod toggle end are both arc surfaces. The pull rod toggle end 311 can toggle the pull rod 32 to slide. A limiting notch 323 is also provided on the pull rod 32. A limiting block 112 is provided on the base 11 corresponding to the limiting notch 323, which cooperates with the bottom edge 3231 of the limiting notch to limit the return position of the pull rod 32. A releaser 2 positioning boss 114 is provided on the base 11, and the releaser 2 is fixedly arranged in the positioning boss 114.

[0048] It also includes a reset spring 33 for resetting the lever 31. The releaser driving end 312 is provided with a positioning boss 3121. The base 11 is provided with a positioning sheet 113. The positioning sheet 113 is provided with ribs. Positioning grooves 1131 are formed between the ribs. One end of the reset spring 33 is sleeved on the positioning boss 3121 and contacts with the contact end of the push rod 25, and the other end contacts with the positioning groove 1131 of the positioning sheet 113.

[0049] To ensure the stability of the pull rod 32, limiting bumps 324 extend from one end of the pull rod 32 towards the base 11 and the middle seat 12 respectively. On the middle seat 12, a rib 122 is provided along the sliding direction of the pull rod 32 at the position of the other end of the pull rod 32. A shoulder step 325 that abuts against the rib 122 is provided at the other end of the pull rod 32.

[0050] To ensure the stability of the shift lever 31, a limiting groove 41 is provided on one side of the terminal wiring board 4 facing the base 11, and the shift lever 31 is inserted into the limiting groove 41. A limiting boss 123 is provided on the middle seat 12, and the shift lever 31 abuts against or is in contact with the limiting boss 123.

Claims

1. A leakage tripping mechanism for a circuit breaker, comprising a circuit breaker housing and a tripping device and a linkage unit located within the circuit breaker housing, characterized in that: The linkage unit includes a lever and a pull rod. The lever is hinged in the circuit breaker housing and has two ends forming a pull rod toggle end and a release driving end respectively. The pull rod is slidably arranged in the circuit breaker housing. The release can push the release driving end to make the lever swing. A locking contact surface is provided on the pull rod. The pull rod toggle end can toggle the pull rod to slide, and also includes a reset spring for resetting the lever. The circuit breaker housing includes a base, a middle seat and a cover plate which are separately arranged. The middle seat is arranged between the base and the cover plate, and the release and the linkage unit are arranged between the middle seat and the base. A guide groove is provided on the base along the sliding direction of the pull rod, and a guide rib is provided on the pull rod facing the side of the base. The guide rib is slidably arranged in the guide groove. A hinge shaft is provided on the base, and a hinge hole is provided on the lever. The hinge shaft is passed through the hinge hole. The base A releaser positioning boss is provided on the top, and the releaser is fixedly arranged in the positioning boss; a linkage groove is provided on the surface of the pull rod facing the side of the base, and the toggle end of the pull rod extends into the linkage groove; both end surfaces of the linkage groove facing the toggle end of the pull rod are arc surfaces; one end of the pull rod extends with limiting protrusions toward the base and the middle seat respectively, and the middle seat is provided with a rib along the sliding direction of the pull rod at the other end of the pull rod, and the other end of the pull rod is provided with a shoulder step that abuts against the rib; a terminal wiring board is provided on the middle seat, and a limiting groove is provided on the terminal wiring board facing the side of the base, and the toggle rod is inserted into the limiting groove; a limiting boss is provided on the middle seat, and the toggle rod is close to or abuts against the limiting boss; a limiting notch is also provided on the pull rod, and a limiting block is provided at the position corresponding to the limiting notch on the base to cooperate with the bottom edge of the limiting notch to limit the return position of the pull rod.

2. The leakage tripping mechanism of the circuit breaker according to claim 1, characterized in that: The releaser includes a coil, a coil frame, a yoke, and an iron core. The yoke is arranged in a "U" shape, a push rod is arranged at one end of the iron core, and the iron core is arranged in a flat plate shape. The coil frame includes a front end plate and a rear end plate which are arranged opposite to each other. A hollow main frame is connected between the front end plate and the rear end plate. The main frame is flat, the iron core is inserted into the main frame, and the coil is wound on the main frame. An opening for the push rod to enter and exit is provided on the front end plate, the bottom edge of the yoke is in contact with the front end surface of the front end plate, and the opposite two side edges of the yoke extend toward the rear end plate and are connected to the two sides of the rear end plate. A through hole for the iron core to enter and exit is provided at the corresponding opening position on the bottom edge of the yoke, and the driving end of the releaser corresponds to the position of the push rod.

3. The leakage tripping mechanism of the circuit breaker according to claim 1, characterized in that: A positioning boss is provided at the driving end of the releaser, a positioning piece is provided on the base, two convex ribs are provided on the positioning piece, a positioning groove is formed between the two convex ribs, one end of the reset spring is sleeved on the positioning boss and abuts against the driving end of the releaser, and the other end abuts against the positioning groove.

4. The leakage tripping mechanism of the circuit breaker according to claim 2, characterized in that: Four rectangular protrusions are arranged on the front end plate, and notches are arranged corresponding to the four protrusion positions on the yoke, and the protrusions are inserted in the corresponding notches; slots are arranged on both sides of the rear end plate, and plug-ins are arranged on the opposite sides of the yoke, and the plug-ins are inserted in the corresponding slots.

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