CN112002622B

CN112002622B - Miniature circuit breaker

Info

Publication number: CN112002622B
Application number: CN202010877253.2A
Authority: CN
Inventors: 谢志杨
Original assignee: Xiamen Hengfengli Electronics Co ltd
Current assignee: Xiamen Hengfengli Electronics Co ltd
Priority date: 2020-08-27
Filing date: 2020-08-27
Publication date: 2023-01-03
Anticipated expiration: 2040-08-27
Also published as: CN112002622A

Abstract

A miniature circuit breaker comprises a shell, wherein a cavity is arranged in the shell, an opening is formed in the left end of the shell, a rotating button is arranged in the cavity and can be rotatably arranged in the cavity, a handle is arranged on the rotating button, and the handle penetrates out of the opening; the rotating button is provided with a connecting rod, the bottom of the connecting rod is provided with a movable contact, a supporting frame is arranged in the cavity, the supporting frame is provided with a fixed contact, and when the handle is positioned at the uppermost position, the movable contact is in contact with the fixed contact; still be provided with overload protection device and short-circuit protection device in the cavity, can be manual open it with close, when using in addition, short-circuit protection device and overload protection device can control miniature circuit breaker respectively, and the reaction is sensitive fast moreover to can instruct the external world through instructing the strip, what kind of aspect goes wrong that the user can be convenient sees out on the earth, overhauls simultaneously, overhauls the back that finishes, only need with it push back can.

Description

Miniature circuit breaker

Technical Field

The invention relates to the technical field of circuit breakers, in particular to a miniature circuit breaker.

Background

The circuit breaker is an important component of the electrical appliance industry and has been widely applied, and when an electrical circuit works normally, the circuit breaker can achieve the functions of power failure, power supply, circuit conversion and the like by closing or opening a circuit for supplying electric energy; when the electrical circuit is in overload, short circuit and other abnormalities, the circuit breaker can cut off the electrical circuit by tripping, so that the safety of workers and the normal operation of equipment are prevented from being endangered due to circuit faults.

For example, the patent with the application number of ' 201810771793.5 ' named as ' circuit breaker ' discloses ' a circuit breaker, which comprises a shell, a handle arranged in the shell, an operating mechanism, a tripping protection mechanism and a tripping piece, wherein the tripping protection mechanism comprises an armature in snap fit with the operating mechanism, a bimetallic strip is arranged on one side of the armature, which is far away from the operating mechanism, a pole shoe arranged at a distance from the armature is arranged on the bimetallic strip, the tripping piece is pivotally arranged in the shell, one end of the tripping piece extends out of the shell, the other end of the tripping piece is arranged corresponding to the armature, the tripping piece can trigger the armature to act to release the snap fit with the operating mechanism, the snap fit with the operating mechanism can be triggered by rotating one end of the tripping piece, which extends out of the shell, and the circuit breaker can be conveniently tested whether to normally trip or not when being produced and used peacefully.

Although the short circuit and overload protection function can be realized, the protection structures are arranged together, on one hand, the problem can not be immediately judged, on the other hand, the reaction is not sensitive due to the compact structure, and the effect is not ideal.

Disclosure of Invention

Technical problem to be solved

The invention aims to provide a miniature circuit breaker which has a compact structure and can accurately react to short circuit and overload.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: a miniature circuit breaker comprises a shell, wherein a cavity is arranged in the shell, an opening is formed in the left end of the shell, a rotating button is arranged in the cavity and can be rotatably arranged in the cavity, a handle is arranged on the rotating button, and the handle penetrates out of the opening;

the rotating button is provided with a connecting rod, the bottom of the connecting rod is provided with a movable contact, a supporting frame is arranged in the cavity, the supporting frame is provided with a fixed contact, and when the handle is positioned at the uppermost position, the movable contact is in contact with the fixed contact;

an overload protection device and a short-circuit protection device are further arranged in the cavity, the overload protection device comprises a bimetallic strip, a swinging rod is arranged on the connecting rod, one end of the bimetallic strip is communicated with an external circuit, and the other end of the bimetallic strip abuts against the swinging rod; the short-circuit protection device comprises a base, an armature, a pole shoe and a driving rod, wherein the pole shoe and the armature are respectively arranged at two ends of the base, a positioning hole is formed in the armature, one end shell of the driving rod is arranged in a cavity in a rotating mode, the other end of the driving rod is arranged on the positioning hole in a lapping mode, the driving rod is provided with a push rod close to the other end of the driving rod, a driving port is formed in the position, corresponding to the push rod, of the connecting rod, a positioning plate and a first spring are arranged in the cavity, one end of the first spring is fixed to the positioning plate, the other end of the first spring is fixed to the driving rod, the pole shoe is communicated with an external circuit, a second spring is arranged between the pole shoe and the armature, one end of the second spring is connected with the pole shoe, and the other end of the second spring is connected with the armature.

In order to facilitate the prompt of overload, the invention is improved in that a first hole is formed in the upper portion of the left side of the shell, a first baffle is arranged in the cavity, a first sliding cavity is formed between the first baffle and the inner wall of the left side of the shell, a first sliding block is arranged in the first sliding cavity, a rotating rod is arranged in the cavity, a driving roller is arranged at one end of the rotating rod, a driven roller is arranged at the other end of the rotating rod, the driving roller abuts against the bimetallic strip, a groove is formed in the first baffle, a driving sliding groove is formed in the lower portion of the first sliding block, the driven roller extends into the groove and abuts against the driving sliding groove, and an indication strip is arranged on the left side of the first sliding block.

In order to facilitate short circuit prompting, the invention is improved in that a second hole is formed in the lower portion of the left side of the shell, a second baffle is arranged in the cavity, a second sliding cavity is formed by the second baffle and the inner wall of the left side of the shell, a second sliding block is arranged in the second sliding cavity, an indication strip is arranged on the second sliding block, a connecting rod is further arranged in the cavity, one end of the second sliding block is hinged with one end of the connecting rod, and the other end of the connecting rod is connected with the driving rod.

In order to facilitate the access of a circuit, the invention is improved in that the upper end and the lower end of the shell are respectively provided with a threaded hole, the bottom of the threaded hole is longitudinally provided with a circuit connecting hole, and the bottom of the threaded hole is provided with a connecting sheet.

In order to realize the stability of the movement of the magnet, the invention has the improvement that the top of the pole shoe is provided with a limiting plate, the front end of the limiting plate is provided with a baffle, and the front end of the base is also provided with a baffle.

In order to facilitate the matching of the driving rod and the positioning hole, the invention has the improvement that the positioning hole is a square hole, and the lower surface of the square hole is provided with anti-skidding grains for increasing friction force.

(III) advantageous effects

Compared with the prior art, the invention provides a miniature circuit breaker, which has the following beneficial effects:

this miniature circuit breaker can be manually open it and close, and when using, short-circuit protection device and overload protection device can control miniature circuit breaker respectively, and the reaction is sensitive fast moreover to can instruct the external world through the instruction strip, what the aspect goes wrong on the ground is what the user can be convenient sees that what the user can be, overhauls simultaneously, overhauls the back that finishes, only need with it push back can.

Drawings

Fig. 1 is a schematic structural view of a miniature circuit breaker according to the present invention;

fig. 2 is an internal structural view of a micro circuit breaker of the present invention;

fig. 3 is a view illustrating a structure of a first hole position of the micro circuit breaker according to the present invention;

fig. 4 is a partially enlarged view of a micro circuit breaker of the present invention;

in the figure: 1. a housing; 2. a cavity; 3. an opening; 4. turning a button; 5. a handle; 6. a connecting rod; 7. a movable contact; 8. a support frame; 9. a stationary contact; 10. a bimetal; 11. a swing lever; 12. a base; 13. an armature; 14. a pole shoe; 15. a drive rod; 16. positioning holes; 17. a push rod; 18. a drive port; 19. a first spring; 20. positioning a plate; 21. a second spring; 22. a first hole; 23. a first baffle plate; 24. a first sliding cavity 25, a first slider; 26. driving the roller; 27. rotating the rod; 28. slotting; 29. a drive chute; 30. an indicator strip; 31. a second hole; 32. a second baffle; 33. a second sliding chamber; 34. a second slider; 35. a connecting rod; 36. threaded hole 37, circuit connection hole; 38. connecting sheets; 39. a limiting plate; 40. and a baffle plate.

Detailed Description

In order to make the technical solution of the present invention more apparent, the present invention is further described in detail with reference to the following examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1-4, the miniature circuit breaker of the present invention comprises a housing 1, a cavity 2 is arranged in the housing 1, an opening 3 is arranged at the left end of the housing 1, a rotating button 4 is arranged in the cavity 2, the rotating button 4 is rotatably arranged in the cavity 2, a handle 5 is arranged on the rotating button 4, and the handle 5 penetrates through the opening 3;

a connecting rod 6 is arranged on the rotating button 4, a movable contact 7 is arranged at the bottom of the connecting rod 6, a supporting frame 8 is arranged in the cavity 2, a static contact 9 is arranged on the supporting frame 8, and when the handle 5 is positioned at the uppermost position, the movable contact 7 is in contact with the static contact 9;

an overload protection device and a short-circuit protection device are further arranged in the cavity 2, the overload protection device comprises a bimetallic strip 10, a swing rod 11 is arranged on the connecting rod 6, one end of the bimetallic strip 10 is communicated with an external circuit, and the other end of the bimetallic strip 10 abuts against the swing rod 11; the short-circuit protection device comprises a base 12, an armature 13, a pole shoe 14 and a driving rod 15, wherein the pole shoe 14 and the armature 13 are respectively arranged at two ends of the base 12, a positioning hole 16 is formed in the armature 13, one end of the driving rod 15 is rotatably arranged in the cavity 2, the other end of the driving rod 15 is lapped on the positioning hole 16, a push rod 17 is arranged at a position, close to the other end, of the driving rod 15, a driving port 18 is formed in the connecting rod 6 corresponding to the position of the push rod 17, a positioning plate 20 and a first spring 19 are arranged in the cavity 2, one end of the first spring 19 is fixed with the positioning plate 20, the other end of the first spring 19 is fixed with the driving rod 15, the pole shoe 14 is communicated with an external circuit, a second spring 21 is arranged between the pole shoe 14 and the armature 13, one end of the second spring 21 is connected with the pole shoe 14, and the other end of the second spring 21 is connected with the armature 13.

The miniature circuit breaker of novel structure, the rotatable setting casing 1 that sets up of turn-knob 4, handle 5 stretches out opening 3, and casing 1 is provided with two gears under the general condition, and one is opened one and is closed, when being located the open mode, as figure 1, movable contact 7 and stationary contact 9 under the support frame 8 link to each other, the circuit intercommunication of whole miniature circuit breaker control.

When the detected circuit is overloaded, because the bimetallic strip 10 always passes through the current, the overloaded current can deform the bimetallic strip 10, the bimetallic strip is bent upwards in the figure, the swinging rod 11 is driven to move in the bending process, the connecting rod 6 is driven to move in the moving process, the movable contact 7 is separated from the fixed contact 9, meanwhile, the connecting rod 6 moves to just drive the handle 5 to move from the opening state to the closing state, and the handle 5 can be pushed back to the original position only after the circuit is finished.

In a normal state, one end of the driving rod 15 extends into the positioning hole 16, the first spring 19 provides a downward restoring force for the driving rod 15, when a detected circuit is short-circuited, current becomes very large, the pole shoe 14 generates a large magnetic force instantly, the armature 13 is adsorbed, the armature 13 overcomes the elastic force of the second spring 21 and moves towards the pole shoe 14, the driving rod 15 is separated from the positioning hole 16 and moves downwards around a hinge point, the pushing rod 17 extends into the driving port 18 of the connecting rod 6 in the moving process, the connecting rod 6 is pushed backwards, the movable contact 7 leaves the fixed contact 9, the connecting rod 6 drives the handle 5 to move from an opening state to a closing state, the pole shoe 14 and the armature 13 lose the adsorbing force only after just one circuit is repaired, the armature 13 returns by virtue of the second spring 21, and meanwhile the connecting rod 6 is pushed to drive the driving rod 15 to return through the pushing rod 17 and finally clamp the positioning hole 16.

The whole miniature circuit breaker is effectively protected by the overload protection device and the short-circuit protection device, so that the miniature circuit breaker is safe and reliable.

In this embodiment, casing 1 left side top is provided with first hole 22, be provided with first baffle 23 in the cavity 2, form first slip chamber 24 between first baffle 23 and the casing 1 left side inner wall, be provided with first slider 25 in the first slip chamber 24, be provided with dwang 27 in the cavity 2, the one end of dwang 27 is provided with drive roller 26, the other end of dwang 27 is provided with driven roller, drive roller 26 supports on bimetallic strip 10, fluting 28 has been seted up on first baffle 23, first slider 25 below is provided with drive spout 29, driven roller stretches into fluting 28 and supports on drive spout 29, be provided with instruction strip 30 on the first slider 25 left side.

When the bimetallic strip 10 is bent, the driving roller 26 is pushed, so that the whole rotating rod 27 is driven to swing, the driven roller can move, the first sliding block 25 is further driven to slide, the indication strip 30 moves at the position of the first hole 22 during the first sliding block 25, and the indication can be directly seen from the outside, so that the tripping caused by overload is prompted.

In this embodiment, a second hole 31 is formed below the left side of the casing 1, a second baffle 32 is arranged in the cavity 2, the second baffle 32 and the inner wall of the left side of the casing 1 form a second sliding cavity 33, a second sliding block 34 is arranged in the second sliding cavity 33, an indication strip 30 is arranged on the second sliding block 34, a connecting rod 35 is further arranged in the cavity 2, one end of the second sliding block 34 is hinged to one end of the connecting rod 35, and the other end of the connecting rod 35 is connected to the driving rod 15.

When the driving rod 15 rotates downwards, the connecting rod 35 is driven to move, and at the same time, the second sliding block 34 is driven to move in the second sliding cavity 33, the indication bar 30 moves to the position of the second hole 31, and the indication bar 30 can be directly seen from the outside, so that the indication is a tripping operation caused by a short circuit.

In this embodiment, the upper end and the lower extreme of casing 1 all are provided with screw hole 36, and vertically seted up circuit hole 37 in the bottom of screw hole 36, and the bottom of screw hole 36 is provided with connection piece 38, and wire and cable passes through circuit interface and stretches into in casing 1 to contact with connection piece 38, positioning bolt directly passes screw hole 36 and screws fixedly, guarantees circuit connection's stability.

In this embodiment, the top of the pole piece 14 is provided with a limiting plate 39, the front end of the limiting plate 39 is provided with a baffle 40, and the front end of the base 12 is also provided with the baffle 40.

The two stop plates 40 are provided to limit the movement of the armature 13 and facilitate the engagement between the positioning hole 16 and the driving rod 15.

In this embodiment, the positioning hole 16 is a square hole, and the lower surface of the square hole is provided with anti-slip lines for increasing friction force, so as to prevent misoperation of the cooperation between the driving rod 15 and the positioning hole 16.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A miniature circuit breaker is characterized by comprising a shell (1), wherein a cavity (2) is arranged in the shell (1), an opening (3) is formed in the left end of the shell (1), a rotating button (4) is arranged in the cavity (2), the rotating button (4) is rotatably arranged in the cavity (2), a handle (5) is arranged on the rotating button (4), and the handle (5) penetrates out of the opening (3);

a connecting rod (6) is arranged on the rotating button (4), a movable contact (7) is arranged at the bottom of the connecting rod (6), a supporting frame (8) is arranged in the cavity (2), a fixed contact (9) is arranged on the supporting frame (8), and when the handle (5) is positioned at the uppermost position, the movable contact (7) is contacted with the fixed contact (9);

an overload protection device and a short-circuit protection device are further arranged in the cavity (2), the overload protection device comprises a bimetallic strip (10), a swing rod (11) is arranged on the connecting rod (6), one end of the bimetallic strip (10) is communicated with an external circuit, and the other end of the bimetallic strip (10) abuts against the swing rod (11);

the short-circuit protection device comprises a base (12), an armature (13), a pole shoe (14) and a driving rod (15), wherein the pole shoe (14) and the armature (13) are respectively arranged at two ends of the base (12), a positioning hole (16) is formed in the armature (13), one end of the driving rod (15) is rotatably arranged in a cavity (2), the other end of the driving rod (15) is lapped on the positioning hole (16), a push rod (17) is arranged at a position, close to the other end, of the driving rod (15), a driving port (18) is arranged at a position, corresponding to the push rod (17), of the connecting rod (6), a positioning plate (20) and a first spring (19) are arranged in the cavity (2), one end of the first spring (19) is fixed with the positioning plate (20), the other end of the first spring (19) is fixed with the driving rod (15), the pole shoe (14) is communicated with an external circuit, a second spring (21) is arranged between the pole shoe (14) and the armature (13), one end of the second spring (21) is connected with the armature (13);

casing (1) left side top is provided with first hole (22), be provided with first baffle (23) in cavity (2), form first slip chamber (24) between first baffle (23) and casing (1) left side inner wall, be provided with first slider (25) in first slip chamber (24), be provided with dwang (27) in cavity (2), the one end of dwang (27) is provided with drive roller (26), the other end of dwang (27) is provided with driven roller, and drive roller (26) support on bimetallic strip (10), fluting (28) have been seted up on first baffle (23), first slider (25) below is provided with drive spout (29), driven roller stretches into fluting (28) and supports on drive spout (29), be provided with on first slider (25) left side and instruct strip (30).

2. The miniature circuit breaker according to claim 1, wherein a second hole (31) is formed below the left side of the housing (1), a second baffle (32) is arranged in the cavity (2), the second baffle (32) and the inner wall of the left side of the housing (1) form a second sliding chamber (33), a second sliding block (34) is arranged in the second sliding chamber (33), an indication strip (30) is arranged on the second sliding block (34), a connecting rod (35) is further arranged in the cavity (2), one end of the second sliding block (34) is hinged to one end of the connecting rod (35), and the other end of the connecting rod (35) is connected to the driving rod (15).

3. The miniature circuit breaker according to claim 1, wherein the upper end and the lower end of the housing (1) are provided with threaded holes (36), the bottom of the threaded hole (36) is longitudinally provided with a circuit connecting hole (37), and the bottom of the threaded hole (36) is provided with a connecting sheet (38).

4. The miniature circuit breaker according to claim 1, wherein a limit plate (39) is disposed on the top of said pole piece (14), a baffle (40) is disposed at the front end of the limit plate (39), and a baffle (40) is disposed at the front end of said base (12).

5. The miniature circuit breaker according to claim 1, wherein said positioning hole (16) is a square hole, and a lower surface of said square hole is provided with friction-increasing anti-slip threads.