CN219936975U

CN219936975U - Small-sized breaker accessory

Info

Publication number: CN219936975U
Application number: CN202321606734.5U
Authority: CN
Inventors: 吕学学; 吕秉轩; 杨勇
Original assignee: Yueqing Yijin Electronic Co ltd
Current assignee: Yueqing Yijin Electronic Co ltd
Priority date: 2023-06-25
Filing date: 2023-06-25
Publication date: 2023-10-31
Anticipated expiration: 2033-06-25

Abstract

The utility model discloses a small-sized breaker accessory, which solves the problem that tripping cannot be realized when low voltage is achieved. The electromagnetic system comprises an electromagnet mechanism and a swinging bracket, and the electromagnet mechanism is electrically connected with the input end; the swing support comprises a suction end, a jacking end and a fulcrum, the fulcrum of the swing support is closer to the jacking end, the swing support is rotatably connected to the shell around the fulcrum of the middle frame body, the suction end is in suction fit with the electromagnet mechanism, and the jacking end is in jacking fit with the jump buckle. The electromagnet mechanism attracts the swing bracket through electromagnetic force, so that the attraction end of the swing bracket is close to or contacts with the electromagnet mechanism, and the pressing end presses the trip button to enable the trip button to displace, and the circuit breaker accessory is driven to trip; because the fulcrum of the swing bracket is closer to the top pressure end, the electromagnetic attraction force required by the electromagnet mechanism can be smaller to generate a pull-in reaction, low-voltage tripping can be realized below 70% of rated control power supply voltage, and the safety protection performance of products is greatly improved.

Description

Small-sized breaker accessory

Technical Field

The utility model relates to the field of circuit breaker accessories, in particular to a small-sized circuit breaker accessory.

Background

The miniature circuit breaker is also called miniature circuit breaker, is mainly used in various places such as industry, business, high-rise and residential houses, can be used for overload and short-circuit protection of the circuit, and can also be used for infrequent operation conversion of the circuit under normal conditions. The accessories of the circuit breaker are used as derivatives and supplements of the functions of the low-voltage circuit breaker, a control means is added for the low-voltage circuit breaker, the protection functions are enlarged, the application range of the low-voltage circuit breaker is wider, the protection functions are more complete, and the operation and installation modes are more. The small-sized breaker accessory comprises an auxiliary contact, an alarm contact, an undervoltage release and the like.

For example, the chinese utility model patent in the prior art: CN105702536B, an auxiliary contact with shunt tripping, which discloses an electromagnetic system, an operating mechanism and two micro switches, wherein the electromagnetic system comprises a housing, a bracket, a shunt tripping coil and an iron core component, the electromagnetic system, the operating mechanism and the two micro switches are fixedly installed on the housing, the bracket is fixedly installed on the housing, and the shunt tripping coil and the iron core component are arranged on the bracket. The iron core component comprises an ejector rod, a movable iron core, a static iron core and an iron core spring, wherein the movable iron core and the static iron core are fixedly connected through the ejector rod, and the iron core spring is arranged between the movable iron core and the static iron core. When the shunt tripping mechanism acts, the magnetic force generated by the shunt tripping coil enables the movable iron core and the fixed iron core to overcome the resistance of the iron core spring to absorb and enable the ejector rod to move leftwards to push the operating mechanism to trip, so that the lock catch is separated from the trip, and the tripping is realized. In practical use, the volume of the electromagnetic system of the accessory is limited by the volume of the accessory, and the volume of the electromagnetic system of the accessory cannot be infinitely large, so that the electromagnetic force which can be provided is basically a fixed value, and the tripping function can only be realized within the range of 70-110% of the rated control power supply voltage. However, in some occasions with high safety requirements, tripping needs to be realized under 70% of rated control power supply voltage, and tripping cannot be realized under low voltage by the electromagnetic force of the existing electromagnetic system, so that the safety protection performance of accessories is limited.

Disclosure of Invention

The purpose of the utility model is that: in order to overcome the defects of the prior art, the utility model provides a small-sized breaker accessory, which solves the problem that tripping cannot be realized at low voltage.

The technical scheme of the utility model is as follows: the electromagnetic system comprises an electromagnet mechanism and a swing bracket, and the electromagnet mechanism is electrically connected with the input end; the swing support comprises a suction end, a jacking end and a fulcrum positioned in the middle, the fulcrum of the swing support is closer to the jacking end, the swing support is rotatably connected to the shell around the fulcrum of the middle frame body, the suction end is matched with the electromagnet mechanism in a suction manner to drive the swing support to swing, and the jacking end is matched with the jump buckle in a jacking manner.

By adopting the technical scheme, the electromagnet mechanism attracts the swing bracket through electromagnetic force, so that the attraction end of the swing bracket is close to or contacts with the electromagnet mechanism, and the pressing end presses the operating mechanism to enable the trip buckle to displace, thereby driving the circuit breaker accessory to trip; because the fulcrum of the swing bracket is closer to the top pressure end, the electromagnetic attraction force required by the electromagnet mechanism can be smaller to generate a suction reaction, thus low-voltage tripping can be realized below 70% of rated control power supply voltage, and the safety protection performance of products is greatly improved.

In one possible design, the electromagnet mechanism comprises a coil frame, a coil is wound outside the coil frame, a movable iron core is installed in the coil frame in an adapting way, the movable iron core comprises an inner attraction part, an outer attraction part and a connecting part fixedly connecting the inner attraction part and the outer attraction part, the inner attraction part movably penetrates through the coil frame, the end part of the inner attraction part and the attraction end of the swing bracket form a first attraction point, the outer attraction part is positioned outside the coil frame, and the end part of the outer attraction part and the attraction end of the swing bracket form a second attraction point.

By adopting the design, the movable iron core extends outwards to form the inner suction point and the outer suction point, and compared with the prior art which has only one suction action point, the electromagnetic suction force can be increased, and the required voltage can be smaller.

In one possible design, the movable iron core is in an n shape, the inner attraction part and the outer attraction part are arranged in parallel, and the connecting part is arranged perpendicular to the inner attraction part.

By adopting the design, electromagnetic force with the same direction action can be formed, and electromagnetic suction force can be effectively conducted.

In one possible design, the swing bracket comprises a plastic outer layer and a metal block, wherein the metal block is embedded and fixed in the plastic outer layer, and the metal block is opposite to the inner attraction part and the outer attraction part respectively.

By adopting the design, the metal block is arranged at the position required to be attracted by the inner attraction part and the outer attraction part, so that the external interference is reduced, the magnetic attraction effect is more concentrated, and the magnetic attraction effect of the electromagnet mechanism is improved.

In one possible design, a reset tension spring is also arranged in the shell, and two ends of the reset tension spring are respectively hooked on the top pressure end and the shell.

By adopting the design, when the circuit breaker accessory needs to be reset, the electromagnetic system is not electrified, and the swing bracket is reset through the reset tension spring.

In one possible design, a limiting protrusion is fixed in the shell, and the limiting protrusion is located on one side of the displacement action of the pressing end.

By adopting the design, the device is used for limiting the swinging action of the swinging bracket and preventing the normal operation of the release caused by excessive action.

In one possible design, the operating mechanism comprises a connecting rod, a lever member matched with the connecting rod, and a lock catch pivoted with the lever member, wherein the connecting rod is connected with the handle, and the lock catch is matched with the jump buckle in a locking way.

By adopting the design, the lock catch and the jump buckle are buckled in the closing process, and when the jump buckle is separated from the lock catch, the lock catch drives the connecting rod and the handle to separate from the gate for releasing.

Drawings

FIG. 1 is a schematic diagram of the structure of the utility model when tripped;

FIG. 2 is a schematic diagram of the electromagnetic system of the present utility model;

FIG. 3 is an exploded view of the electromagnetic system of the present utility model;

1, a shell; 2. an operating mechanism; 3. an input end; 4. an electromagnetic system; 5. a micro-switch; 21. a handle; 22. a contact support; 23. jumping buckle; 51. a contact arm; 41. an electromagnet mechanism; 42. a swing bracket; 421. a suction end; 422. a pressing end; 423. a fulcrum; 24. a connecting rod; 25. a lever member; 26. locking; 411. a coil former; 412. a coil; 413. a moving iron core; 414. an inner suction part; 415. an outer suction portion; 416. a connection part; 424. a plastic outer layer; 425. a metal block; 11. resetting the tension spring; 12. and a limit protrusion.

Description of the embodiments

The miniature circuit breaker accessory shown in fig. 1-3 comprises a shell 1, an operating mechanism 2 and an input end 3, wherein an electromagnetic system 4 and a micro switch 5 are arranged in the shell 1, the operating mechanism 2 comprises a handle 21, a contact support 22 which is matched with the handle 21 and a trip button 23 which enables the operating mechanism 2 to trip by pressing, the micro switch 5 comprises a contact arm 51 which controls the micro switch 5 to be opened and closed by pressing, the electromagnetic system 4 comprises an electromagnet mechanism 41 and a swinging bracket 42, and the electromagnet mechanism 41 is electrically connected with the input end 3. The swing bracket 42 includes a engaging end 421, a pressing end 422, and a supporting point 423 located at about the middle between the engaging end 421 and the pressing end 422, where the supporting point 423 of the swing bracket 42 is closer to the pressing end 422 than the engaging end 421, the swing bracket 42 is rotatably connected to the housing 2 around the supporting point 423 of the middle frame body, and the engaging end 421 engages with the electromagnet mechanism 41 to drive the swing bracket 42 to swing, and the pressing end 422 is in pressing fit with the jump buckle 23. When the tripping is required to be controlled, the electromagnet mechanism 41 is electrified to generate an electromagnetic field and attracts the attraction end 421 of the swing bracket 42 through electromagnetic force, the swing bracket 42 rotates around the pivot 423, the top pressing end 422 is shifted and presses the trip button 23, and the trip button 23 acts to trip the tripping operation mechanism 2.

The operating mechanism 2 comprises a connecting rod 24, a lever member 25 matched with the connecting rod 24 and a lock catch 26 pivoted with the lever member 25, wherein the connecting rod 24 is connected with the handle 21, and the lock catch 26 is matched with the jump button 23 in a locking way.

The electromagnet mechanism 41 comprises a coil frame 411, a coil 412 is wound outside the coil frame 411, a movable iron core 413 is mounted in the coil frame 411 in an adapting manner, the movable iron core 413 comprises an inner attraction portion 414, an outer attraction portion 415 and a connecting portion 416 integrally connecting the inner attraction portion 414 and the outer attraction portion 415, the inner attraction portion 414 movably penetrates through the coil frame 411, the end portion of the inner attraction portion and the attraction end 421 of the swing bracket 42 form a first attraction point, and the outer attraction portion 415 is located outside the coil frame 411, and the end portion of the outer attraction portion and the attraction end 421 of the swing bracket 42 form a second attraction point. Thus, two suction points are formed, electromagnetic suction force is increased, and the required voltage can be smaller. According to the experimental result, taking a rated voltage of 12V as an example, the required tripping voltage is about 5V, namely about 40% of the rated control power supply voltage, so that low-voltage tripping is realized.

When the circuit breaker is specifically used, the operating handle 21 rotates in the anticlockwise direction, and the contact support 22 rotates around the mechanism rotating shaft in the clockwise direction through the transmission connecting rod 24, the lock catch 26 and the jump button 23 and is separated from the contact arm 51 of the micro switch 5, so that the circuit breaker is in a closing state; when the tripping is required to be controlled, the magnetic force generated by the coil 412 makes the movable iron core 413 attract the swing bracket 42 to enable the attraction end 421 to swing leftwards, then the top pressure end 422 pushes the operating mechanism 2 to jump buckle 23 rightwards to separate the lock catch 26 from the jump buckle 13, the operating mechanism 2 trips and drives the matched breaker to cut off the power supply, meanwhile, the contact support 22 controls the coil 412 to be in an off state by pressing the contact arm 51 of the micro-switch 5, the micro-switch 5 is prevented from being damaged due to repeated attraction of the coil 412, and the micro-switch 5 can accurately judge that a product is switched from one working state to the other working state through a signal lamp, a quick sounder or other control equipment.

The movable iron core 413 is n-shaped, the inner attraction portion 414 and the outer attraction portion 415 are arranged in parallel, and the connecting portion 416 is arranged perpendicular to the inner attraction portion 414. The inner attraction portion 414 and the outer attraction portion 415, which are parallel, can form electromagnetic force acting in the same direction, so that electromagnetic attraction force is effectively conducted.

The swing bracket 42 comprises a plastic outer layer 424 and a metal block 425, wherein the metal block 425 is embedded and fixed in the plastic outer layer 424, and the metal block 425 is arranged opposite to the inner attraction part 414 and the outer attraction part 415 respectively. The arrangement of the metal block 425 at the position where the inner attraction portion 414 and the outer attraction portion 415 need to attract each other is equivalent to that of the swing bracket 42, and compared with the arrangement of the metal block 425 made of metal as a whole, the arrangement can reduce the interference of non-opposite positions, so that the magnetic attraction effect is more concentrated, and the magnetic attraction effect of the electromagnet mechanism 41 is improved. Of course, the entire swing bracket 42 may be made of metal for convenience of processing.

A reset tension spring 11 is also arranged in the shell 2, and two ends of the reset tension spring 11 are respectively hooked on the top pressure end 422 and the shell 2. When the release needs to be reset, the electromagnetic system 4 is not electrified, and the top pressure end 422 of the swing bracket 42 is swung back and reset through the elastic force of the reset tension spring 11.

A limiting protrusion 12 is integrally fixed in the shell 2, and the limiting protrusion 12 is positioned on one side of the displacement action of the top pressure end 422. When the swing bracket 42 swings, the pressing end 422 presses to the trip button 23 to trip, and then abuts against the limiting protrusion 12, so that the swing bracket 42 reaches the action limit, and the normal operation of the trip device caused by excessive action can be prevented.

Claims

1. The utility model provides a miniature circuit breaker annex, is including casing, operating device and input, be provided with electromagnetic system and micro-gap switch in the casing, its characterized in that: the operating mechanism comprises a handle, a contact support which is matched with the handle and a jump buckle which presses to enable the operating mechanism to trip, the micro switch comprises a contact arm which presses to control the micro switch to be opened and closed, and the electromagnetic system and the handle respectively control the contact support to be separated from and contacted with the contact arm; the electromagnetic system comprises an electromagnet mechanism and a swinging bracket, and the electromagnet mechanism is electrically connected with the input end; the swing support comprises a suction end, a jacking end and a fulcrum positioned in the middle, the fulcrum of the swing support is closer to the jacking end, the swing support is rotatably connected to the shell around the fulcrum of the middle frame body, the suction end is matched with the electromagnet mechanism in a suction manner to drive the swing support to swing, and the jacking end is matched with the jump buckle in a jacking manner.

2. The miniature circuit breaker accessory of claim 1, wherein: the electromagnet mechanism comprises a coil frame, a coil is wound outside the coil frame, a movable iron core is arranged in the coil frame in an adapting mode, the movable iron core comprises an inner attraction part, an outer attraction part and a connecting part fixedly connected with the inner attraction part and the outer attraction part, the inner attraction part movably penetrates through the coil frame and forms a first attraction point with the attraction end of the swing bracket, and the outer attraction part is positioned outside the coil frame and forms a second attraction point with the attraction end of the swing bracket.

3. The miniature circuit breaker accessory of claim 2, wherein: the movable iron core is n-shaped, the inner attraction part and the outer attraction part are arranged in parallel, and the connecting part is perpendicular to the inner attraction part.

4. The miniature circuit breaker accessory of claim 2, wherein: the swing support comprises a plastic outer layer and a metal block, wherein the metal block is embedded and fixed in the plastic outer layer, and the metal block is opposite to the inner attraction part and the outer attraction part respectively.

5. The miniature circuit breaker accessory of claim 1 or 2, wherein: the shell is internally provided with a reset tension spring, and two ends of the reset tension spring are respectively hooked on the top pressing end and the shell.

6. The miniature circuit breaker accessory of claim 1 or 2, wherein: the shell is internally fixed with a limiting protrusion, and the limiting protrusion is positioned at one side of the displacement action of the jacking end.

7. The miniature circuit breaker accessory of claim 1 or 2, wherein: the operating mechanism comprises a connecting rod, a lever member matched with the connecting rod and a lock catch pivoted with the lever member, wherein the connecting rod is connected with the handle, and the lock catch is matched with the jump buckle in a locking way.