CN209859900U - Magnetic tripping device for electronic molded case circuit breaker - Google Patents

Abstract

A magnetic tripping device for an electronic molded case circuit breaker belongs to the technical field of low-voltage electrical appliances. Including magnetic release and current transformer, magnetic release include current-carrying conductor, support, armature, reaction spring and pivot, support and current-carrying conductor fixed connection, armature pass through pivot ground pivot on the support, reaction spring connect between support and armature for armature provides the repulsion counter-force that deviates from the support direction, characteristics are: the current-carrying conductor penetrates through the current transformer, an iron core is arranged in the current transformer, and the iron core and the armature are matched to form a magnetic loop of the magnetic release. The advantages are that: the current transformer is used for replacing a magnetic yoke in the prior art, so that the structure of the magnetic tripping device is simplified, the space is saved, and the development trend of miniaturization of the switch is complied with.

Description

Magnetic tripping device for electronic molded case circuit breaker

Technical Field

The utility model belongs to the technical field of low-voltage apparatus, concretely relates to magnetism trip gear for electronic type moulded case circuit breaker.

Background

The circuit breaker is used as an overload, undervoltage and short-circuit protection electric appliance of a low-voltage distribution system and a load protection loop, and when abnormal current occurs in a circuit, a tripping device of the circuit breaker generates tripping action to cut off the circuit, so that load equipment and various components in the circuit system are protected from being damaged. In the existing electronic molded case circuit breaker, a momentary release usually performs short-circuit protection in the form of an electromagnet, and when abnormal current is detected, the circuit breaker is released and a circuit is cut off due to the action of the electromagnet of the release. In order to save cost and facilitate automatic production, a clapper type structure is adopted by a common magnetic release, and the clapper type structure is generally used for load protection under a high-current condition. The structure of the existing clapper type magnetic release comprises a current-carrying conductor, a bracket, a rivet, a magnetic yoke, an armature, a counter-force spring and a pivot. The support, the magnet yoke and the current-carrying conductor are riveted by rivets, the armature iron penetrates through a support hole in the support through a pivot shaft and is fixed on the support, the counter-force spring is fixed on the pivot shaft, one end of the torsion spring is fixed on the support, and the other end of the torsion spring acts on the armature iron. In the existing structure, a current-carrying conductor penetrates through a magnetic yoke, and when a large enough short-circuit current flows, an armature overcomes the counter force of a counter spring and is attracted with the magnetic yoke, so that a tripping device is pushed to trip the circuit breaker. The disadvantages of the above structure are: on one hand, the number of parts is large, the occupied space is large, and the development trend of switch miniaturization deviates from the development trend; on the other hand, the section requirements of the magnetic yoke and the armature are high, the magnetic saturation phenomenon is easy to occur, the mold opening cost is increased, and the difficulty in configuring the counter-force spring is high.

Disclosure of Invention

The task of the utility model is to provide a magnetism trip gear for electronic type moulded case circuit breaker, it utilizes current transformer to replace the yoke among the prior art, has both simplified the structure, saves space again, complies with the miniaturized development trend of switch.

The utility model discloses a task is accomplished like this, a magnetism trip gear for electronic type moulded case circuit breaker, including magnetism trip and current transformer, magnetism trip include current-carrying conductor, support, armature, reaction spring and pivot, support and current-carrying conductor fixed connection, armature pass through pivot ground pin joint on the support, reaction spring connect between support and armature for provide the repulsion counter-force that deviates from the support direction for armature, the current-carrying conductor run through in current transformer, current transformer in be provided with the iron core, iron core and armature cooperate and form the magnetic circuit of magnetism trip.

The utility model discloses a specific embodiment, current transformer still include housing, coil skeleton, rivet, the coil around on the coil skeleton, the iron core form a whole by the multi-disc part superpose and rivet through the rivet to pass the coil skeleton, the whole coil skeleton of housing cladding, coil and iron core.

In another specific embodiment of the present invention, the bracket is U-shaped, and includes a bottom plate, a side plate extending vertically upward from both ends of the bottom plate, the bottom plate is fixedly connected to the current-carrying conductor, and the side plate is located on both sides of the portion of the current-carrying conductor fixedly connected to the bottom plate.

In another specific embodiment of the present invention, the armature includes two side bent plates located at the middle portion and extending face to face toward the bracket, a unhooking surface located at one side of the connecting line of the two side bent plates, and an attracting surface located at the other side of the connecting line of the two side bent plates.

In another specific embodiment of the present invention, the two side bending plates are provided with through holes for the pivot to pass through, and the two side bending plates are provided with two protruding hooks extending toward the opposite surface for blocking the two side plates of the bracket.

In still another specific embodiment of the present invention, the attracting surface of the armature is bent by an angle to form a double-layer structure, thereby preventing the occurrence of magnetic saturation.

In yet another specific embodiment of the present invention, the reaction spring is threaded on the pivot, one end of the reaction spring abuts against the armature, and the other end abuts against the bracket.

In a more specific embodiment of the present invention, the magnetic trip unit further comprises a base, and the magnetic trip and the current transformer are mounted on the base.

The utility model discloses owing to adopted above-mentioned structure, the beneficial effect who has: firstly, the electronic molded case circuit breaker utilizes the current transformer to replace a magnet yoke in the prior art, can effectively improve the attraction of the magnetic tripping device, can provide enough magnetic field intensity for the magnetic tripping device with smaller rated current specification, simplifies the structure of the magnetic tripping device, saves space, reduces cost and conforms to the development trend of switch miniaturization; secondly, the attracting surface of the armature iron is bent by 180 degrees to form a double-layer structure, so that the phenomenon of magnetic saturation is prevented.

Drawings

Fig. 1 is an assembly schematic diagram of a magnetic trip device of an electronic molded case circuit breaker.

Fig. 2 is the assembly schematic of the magnetic release and the current transformer of the present invention.

Fig. 3 is a schematic structural view of the magnetic release of the present invention.

Fig. 4 is a schematic structural diagram of the current transformer of the present invention.

Fig. 5 is an assembly diagram of the magnetic trip device and the base in the electronic molded case circuit breaker.

Fig. 6 is an assembly diagram of the magnetic trip device and the base in the electronic molded case circuit breaker.

In the figure: 1. magnetic release, 11 current-carrying conductors, 111 connecting plates, 112 suction plates, 113 mounting plates, 1131 mounting holes, 12 supports, 121 bottom plates, 122 side plates, 13 armatures, 131 side bent plates, 1311 convex hooks, 132 release hooks, 133 suction surfaces, 14 reaction springs and 15 pivots; 2. the current transformer comprises a current transformer, 21. a housing, 22. a coil, 23. a coil framework, 24. a rivet and 25. an iron core; 3. a base; 4. base, 41, through hole; 5. a coupling plate.

Detailed Description

The following detailed description of the embodiments of the present invention will be described with reference to the accompanying drawings, but the description of the embodiments by the applicant is not intended to limit the technical solutions, and any changes made according to the present invention rather than the essential changes should be considered as the protection scope of the present invention.

Referring to fig. 1 to 6, the present invention relates to a magnetic trip device for an electronic molded case circuit breaker, which includes a base 4, a base 3 installed on the base 4, and a magnetic trip 1 and a current transformer 2 installed on the base 3. The magnetic release 1 comprises a current-carrying conductor 11, a bracket 12, an armature 13, a reaction spring 14 and a pivot 15. The bracket 12 is fixedly connected to the current-carrying conductor 11, specifically, the bracket 12 is U-shaped, and includes a bottom plate 121 and side plates 122 vertically extending from two ends of the bottom plate 121, the bottom plate 121 is fixedly connected to the current-carrying conductor 11, and the side plates 122 are located on two sides of a portion of the current-carrying conductor 11 fixedly connected to the bottom plate 121. The current-carrying conductor 11 is formed by a plurality of bends, wherein one bend comprises a connecting plate 111 fixedly connected with a bottom plate 121 of the bracket 12, an attraction plate 112 opposite to the armature 13 and capable of attracting the armature 13, and a mounting plate 113 electrically connected with the connecting plate 5 of a movable contact (not shown in fig. 5, flexible connections on the movable contact are welded on two sides of the connecting plate 5 to realize the electrical connection of the movable contact and the connecting plate 5). Specifically, the connecting plate 5 is fixedly mounted on the base 4 by fastening screws, the mounting plate 113 is provided with mounting holes 1131, the base 4 is provided with through holes 41 corresponding to the mounting holes 1131, as shown in fig. 6, the fastening screws fasten the connecting plate 5 and the mounting plate 113 up and down by penetrating through the through holes 41 on the base 4, the positioning holes on the connecting plate 5 and the mounting holes 1131, so as to electrically connect the moving contact with the current-carrying conductor 11. The armature 13 is pivotally connected to the bracket 12 through a pivot 15, specifically, the armature 13 includes a side bent plate 131 located at the middle portion and extending toward the bracket 12, a unhooking surface 132 located at one side of the connecting line of the two side bent plates 131, and an attracting surface 133 located at the other side of the connecting line of the two side bent plates 131, as shown in fig. 3, the unhooking surface 132 is located above the two side bent plates 131, and the attracting surface 133 is located below the two side bent plates 131. The two side bent plates 131 are provided with through holes for the pivot 15 to pass through, and two convex hooks 1311 capable of blocking the two side plates 122 of the bracket 12 extend towards opposite surfaces of the two side bent plates 131. The reaction spring 14 is connected between the bracket 12 and the armature 13, specifically, the reaction spring 14 is connected on the pivot 15 in a penetrating manner, one end of the reaction spring 14 abuts against the attraction surface 133 of the armature 13, the other end abuts against the side plate 122 of the bracket 12 for providing a repulsion reaction force for the armature 13 in a direction deviating from the bracket 12, and the convex hook 1311 on the armature 13 is used for preventing the armature 13 from turning excessively under the action of the reaction spring 14.

With reference to fig. 1 to 4, the current transformer 2 includes a housing 21, a coil 22, a bobbin 23, a rivet 24 and an iron core 25, the coil 22 is wound on the bobbin 23, the iron core 25 is formed by overlapping a plurality of pieces and riveting the pieces with the rivet 24, and penetrates through the bobbin 23, and the housing 21 covers the entire bobbin 23, the coil 22 and the iron core 25. The current-carrying conductor 11 penetrates through the current transformer 2 of the circuit breaker, and the iron core 25 and the armature 13 are matched to form a magnetic loop of the magnetic release 1. When a sufficiently large short-circuit current flows, the attraction surface 133 of the armature 13 is attracted toward the iron core 25 against the repulsive reaction force of the reaction spring 14, thereby driving the trip 132 to trip the circuit breaker. The utility model discloses replace the yoke among the prior art by current transformer 2, can effectual improvement magnetism trip gear's suction force, under the condition of the suction force of the same magnetism trip gear of requirement, the volume of installing current transformer 2's magnetism trip gear is littleer. The attraction surface 133 of the armature 13 is bent by 180 degrees to form a double-layer structure, so that the phenomenon of magnetic saturation is prevented.

Claims (8)

1. The utility model provides a magnetic trip gear for electronic type moulded case circuit breaker, includes magnetic trip (1) and current transformer (2), magnetic trip (1) including current-carrying conductor (11), support (12), armature (13), reaction spring (14) and pivot (15), support (12) and current-carrying conductor (11) fixed connection, armature (13) pivot on support (12) through pivot (15) rotation ground, reaction spring (14) connect between support (12) and armature (13) for provide the reaction for armature (13), its characterized in that: current-carrying conductor (11) run through in current transformer (2), current transformer (2) in be provided with iron core (25), iron core (25) cooperate with armature (13) and form the magnetic circuit of magnetism release (1).

2. The magnetic trip unit of the electronic molded case circuit breaker according to claim 1, wherein the current transformer (2) further comprises a case (21), a coil (22), a bobbin (23), and a rivet (24), the coil (22) is wound around the bobbin (23), the core (25) is formed by laminating a plurality of parts and riveting the parts by the rivet (24) into a whole and penetrates through the bobbin (23), and the case (21) covers the whole bobbin (23), the coil (22), and the core (25).

3. The magnetic trip unit of claim 1, wherein the bracket (12) is U-shaped and includes a bottom plate (121) and side plates (122) vertically extending upward from both ends of the bottom plate (121), the bottom plate (121) is fixedly connected to the current-carrying conductor (11), and the side plates (122) are disposed on both sides of a portion of the current-carrying conductor (11) fixedly connected to the bottom plate (121).

4. The magnetic trip device for the electronic molded case circuit breaker according to claim 1, wherein the armature (13) comprises two side bent plates (131) at a central portion thereof extending face to face in a direction toward the bracket (12), a trip (132) at one side of a line connecting the two side bent plates (131), and an attraction face (133) at the other side of the line connecting the two side bent plates (131).

5. The magnetic trip unit for an electronic molded case circuit breaker according to claim 4, wherein the two side bent plates (131) are formed with through holes for the pivot (15) to pass through, and the two side bent plates (131) are formed with two protruding hooks (1311) extending toward opposite surfaces thereof for blocking the two side plates (122) of the bracket (12).

6. The magnetic trip unit for an electronic molded case circuit breaker according to claim 1, wherein the attraction surface (133) of the armature (13) is bent by 180 ° to form a double-layered structure, thereby preventing magnetic saturation.

7. A magnetic trip unit for an electronic molded case circuit breaker according to claim 1 characterized in that the reaction spring (14) is threaded on a pivot (15), one end of the reaction spring (14) abutting on the armature (13) and the other end abutting on the bracket (12).

8. A magnetic trip unit for an electronic molded case circuit breaker according to claim 1, characterized in that the magnetic trip unit further comprises a base (3), the magnetic trip unit (1) and the current transformer (2) being mounted on the base (3).