CN206961773U - Short-circuit protection and the miniature circuit breaker including the device - Google Patents

Abstract

The utility model discloses a short-circuit protection device and a miniature circuit breaker comprising the device. The miniature circuit breaker includes a static contact part, a moving contact part and a snapping assembly, and the snapping assembly drives the moving contact part and the static contact The points are separated, wherein the short circuit protection device includes a conductive part, an iron metal part, an attracting metal part and a pushing part. The conductive part is connected to the static contact part; the iron metal part is set corresponding to the conductive part; the attracting metal part is rotatably connected to the housing of the miniature circuit breaker and set corresponding to the iron metal part; one end of the pushing part is connected to the attracting metal part, and the other One end corresponds to the jump component setting. The short-circuit protection device adopted by the miniature circuit breaker of the utility model has a compact structure and takes up little space, thereby ensuring that the overall size of the miniature circuit breaker meets specifications.

Description

Short circuit protection device and miniature circuit breaker including the device

technical field

The utility model relates to a miniature circuit breaker, in particular to a short-circuit protection device with a more compact structure. The utility model also relates to a miniature circuit breaker using the short-circuit protection device.

Background technique

The miniature circuit breaker is the most widely used terminal protection device in the building electrical terminal power distribution device. The miniature circuit breaker is composed of opening and closing mechanism, contacts, protection device, arc extinguishing system and so on. Its working principle is: use the protection device (release) and the current heating component to realize overload and short circuit protection. When the current passing through the coil in the current heating component is greater than the set current value, the moving iron core of the electromagnetic release will act , Push the striking lever to hit the operating mechanism, unlock the operating mechanism, open the circuit breaker and disconnect the circuit, so as to realize the overload and short circuit protection of the circuit. When the circuit fault is discharged, the circuit is connected through the opening and closing mechanism for closing operation. At present, the most widely used miniature circuit breakers in our country are the manual opening and closing type, and the circuit can be switched on and off by manually toggling the opening and closing mechanism. Manual opening and closing miniature circuit breakers are simple in structure, low in cost, and do not require additional electric energy, so they can perform opening and closing operations without electric energy, and are widely used in old power grids.

However, with the development of science and technology, smart home appliances have been more and more widely used. As an ordinary miniature circuit breaker for protecting electrical appliances, it is also urgent to install an intelligent control system. In order to match the widely used ordinary miniature circuit breakers with manual opening and closing, an intelligent miniature circuit breaker that can be remotely controlled is mainly added to the side of the ordinary miniature circuit breaker. The intelligent miniature circuit breaker operates according to the input control signal. Drive other ordinary miniature circuit breakers for opening and closing operations.

The "Technical Specifications for External Circuit Breakers for Electric Energy Meters" strictly regulates the external dimensions of circuit breakers. Among them, the external shape and size of intelligent miniature circuit breakers are limited to be consistent with ordinary miniature circuit breakers, so as to ensure the consistency of appearance , and facilitate large-scale circuit breaker terminal equipment replacement.

However, the size of the intelligent miniature circuit breakers in the prior art is generally larger than that of ordinary miniature circuit breakers, and their shapes are inconsistent, so they cannot be used directly. , The construction period is long, which is not conducive to the promotion process of the smart grid.

The short-circuit protection of the circuit breaker is mainly composed of coils, iron cores, and magnets. When a short-circuit current occurs, the coil will generate a large magnetic field to magnetize the moving iron core inside the iron core. Under the action of the magnetic field force, the moving iron core will overcome the reaction force of the iron core spring and push the ejector rod inside the iron core. , and finally the locking mechanism of the mechanism is destroyed under the action of the ejector rod, so that the circuit breaker is broken instantly. However, the resulting size is large and takes up very limited space inside the circuit breaker.

Utility model content

The purpose of the utility model is to solve the problem that the size of the short-circuit protection device of the existing miniature circuit breaker is too large, to provide a short-circuit protection device and a miniature intelligent circuit breaker including the short-circuit protection device, which have a simple structure and reduce the occupied area. space.

In order to achieve the above object, the short-circuit protection device of the present utility model is connected in a miniature circuit breaker, and the miniature circuit breaker includes a static contact part, a moving contact part and a jump assembly, and the jump assembly drives The movable contact part is separated from the static contact part, wherein the short circuit protection device includes a conductive part, a ferrous metal part, an attracting metal part and a pushing part. The conductive part is connected to the static contact part; the iron metal part is arranged corresponding to the conductive part; the attracting metal part is rotatably connected to the housing of the miniature circuit breaker and arranged corresponding to the iron metal part; one end of the pushing part It is connected to the attracting metal piece, and the other end is set corresponding to the jumping component.

In an embodiment of the above-mentioned short-circuit protection device, the iron metal part is U-shaped and has a U-shaped slot, and the conductive part passes through the U-shaped slot.

In one embodiment of the above-mentioned short-circuit protection device, the attracting metal piece is a rod-shaped piece, including a first end and a second end, the first end is rotatably connected to the housing of the miniature circuit breaker, and the The second end is a free end.

In one embodiment of the above-mentioned short-circuit protection device, the attracting metal part is arranged on the upper part of the U-shaped groove.

In one embodiment of the above-mentioned short-circuit protection device, the ferrous metal piece has a hypotenuse corresponding to the attracting metal piece.

In one embodiment of the above-mentioned short-circuit protection device, the pushing member is a non-metallic member.

In one embodiment of the above-mentioned short-circuit protection device, one end of the ferrous metal piece is fixedly connected to the housing of the miniature circuit breaker.

The miniature circuit breaker of the present utility model includes a static contact part, a moving contact part, a jumping component and a short circuit protection device, and the jumping component drives the moving contact part to separate from the static contact part when jumping. , wherein the short-circuit protection device is the above-mentioned short-circuit protection device.

In an embodiment of the miniature circuit breaker described above, the miniature circuit breaker further includes an arc extinguishing component and an overheating protection component, and the short circuit protection device is arranged between the arc extinguishing component and the overheating protection component.

In an embodiment of the miniature circuit breaker above, the overheating protection component includes a bimetal, and the free end of the bimetal is disposed corresponding to the pushing member.

The beneficial effect of the utility model lies in that the short-circuit protection device adopted by the miniature circuit breaker of the utility model has a compact structure and takes up little space, ensuring that the overall size of the miniature circuit breaker meets the regulations.

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the utility model.

Description of drawings

Fig. 1 is the structural representation that the short-circuit protection device of the present invention is applied to miniature circuit breaker;

Fig. 2 is a partially enlarged view of the short circuit protection device of the present invention.

Among them, reference signs

100 Short circuit protection device

110 Conductive parts

120 Iron Metal Pieces

121 U-groove

122 Hypotenuse

130 attract metal pieces

131 first end

132 second end

140 push pieces

200 miniature circuit breakers

210 Static contact part

220 Movable contact part

230 jump component

240 arc extinguishing assembly

250 overheating protection components

251 bimetal

Detailed ways

The technical scheme of the utility model is described in detail below in conjunction with the accompanying drawings and specific embodiments, so as to further understand the purpose, scheme and effect of the utility model, but not as a limitation of the scope of protection of the appended claims of the utility model.

As shown in FIG. 1 and FIG. 2 , the short circuit protection device 100 of the present invention is connected to a switch. In this embodiment, the switch is used as a miniature circuit breaker for illustration. The miniature circuit breaker 200 includes a static contact part 210 , a movable contact part 220 and a jumper assembly 230 , and when the jumper assembly 230 jumps, the movable contact part 220 is separated from the static contact part 210 . The short-circuit protection device 100 provides short-circuit protection for the miniature circuit breaker 200 , and triggers the snap-off component 230 to open the circuit breaker when a short-circuit occurs.

Specifically, the short circuit protection device 100 includes a conductive element 110 , a ferrous metal element 120 , an attracting metal element 130 and a pushing element 140 . The conductive part 110 is connected to the static contact part 210, the ferrous metal part 120 is set corresponding to the conductive part 110, the attracting metal part 130 is set corresponding to the ferrous metal part 120, one end of the pushing part 140 is connected to the attracting metal part 130, and the other end corresponds to The jump component 230 is set.

When a short circuit occurs, a short-circuit current passes through the conductive element 110 , and a large current magnetic field is generated at the conductive element 110 , which magnetizes the ferrous metal element 120 disposed corresponding to the conductive element 110 . The attracting metal part 130 is attracted by the magnetic force generated by the ferrous metal part 120 and moves. At the same time, the attracting metal part 130 drives the pushing part 140 connected to it to move and pushes against the jumping component 230 to jump. The movable contact part 220 and The static contact part 210 is separated and opened.

Further, as shown in FIG. 2 , the ferrous metal part 120 can be U-shaped, with a U-shaped groove 121, and the conductive part 110 correspondingly passes through the U-shaped groove 121 of the ferrous metal part 120, and the ferrous metal part 120 surrounds the conductive part 110 on three sides. And set. When a short-circuit current flows through the conductive member 110 to generate a large current magnetic field, the ferrous metal member 120 can be magnetized and generate magnetic force.

The attracting metal piece 130 is a rod-shaped piece, which is arranged on the upper part of the U-shaped groove 121, and includes a first end 131 and a second end 132. The first end 131 is rotatably connected to the housing of the miniature circuit breaker 200, and the second end 132 is free end. One end of the ferrous metal part 120 is fixedly connected to the housing of the miniature circuit breaker 200 . The ferrous metal part 120 has a hypotenuse portion 122 corresponding to the attracting metal part 130 . As shown in the figure, the bevel portion 122 is located at the top of the sidewalls on both sides of the U-shape of the ferrous metal part 120 . The distance between the hypotenuse 122 of the ferrous metal part 120 and the attracting metal part 130 gradually increases from the first end 131 to the second end 132 of the attracting metal part 130 to reserve space for the attracting metal part 130 to rotate.

When the ferrous metal part 120 corresponding to the conductive part 110 generates a magnetic force, the free second end 132 of the attracting metal part 130 is attracted and rotates around the first end 131 toward the ferrous metal part 120 . When the attracting metal part 130 rotates, it drives the pushing part 140 connected thereto to rotate.

The pushing piece 140 is a non-metallic piece, and one end of the pushing piece 140 is connected at an appropriate distance from the rotation center of the first end 131 of the attracting metal piece 130 so as to be able to move properly with the rotation of the attracting metal piece 130 . The other end of the pushing member 140 corresponds to the jumping component 230. When a short circuit occurs, the pushing member 140 pushes against the jumping component 230 with the rotation of the attracting metal part 130, so that the pushing component 230 jumps and drives the movable contact. The part 220 is away from the movable contact part 210 .

When the short-circuit current disappears, the high-current magnetic field disappears immediately, and the magnetic force of the iron metal part 120 disappears due to demagnetization, and the attracting metal part 130 returns to its original position under the action of a reset part such as a reset torsion spring, driving the pushing part 140 to leave the sudden jump Component 230.

As shown in FIG. 1 , the miniature circuit breaker 200 further includes an arc extinguishing component 240 and an overheating protection component 250 , and the short circuit protection device 100 is disposed between the arc extinguishing component 240 and the overheating protection component 250 .

The overheating protection assembly 250 includes a bimetallic piece 251 , and a free end of the bimetallic piece 251 is disposed corresponding to the pushing piece 140 of the short circuit protection device 100 . When overheating occurs, the bimetallic part 251 is bent by heat and pushes against the pushing part 140 of the short circuit protection device 100, and the pushing part 140 pushes the snap-off component 230 to trip and open to realize overheating protection.

Of course, the utility model can also have other various embodiments, and those skilled in the art can make various corresponding changes and deformations according to the utility model without departing from the spirit and essence of the utility model, but These corresponding changes and deformations should all belong to the protection scope of the appended claims of the present utility model.

Claims (10)

1. a kind of short-circuit protection, being connected in a miniature circuit breaker, the miniature circuit breaker includes stationary contact portion, movable contact Portion and kick component, drive during the kick component kick movable contact portion with the stationary contact part from its feature exists In the short-circuit protection includes：

Electric-conductor, it is connected with the stationary contact portion；

Ferrous metal part, the corresponding electric-conductor are set；

Attract metalwork, be rotatably connected on the housing of the miniature circuit breaker and the corresponding ferrous metal part is set；And

Push piece, one end are connected on the attraction metalwork, and the other end corresponds to the kick component and set.

2. short-circuit protection according to claim 1, it is characterised in that the ferrous metal part is U-shaped, has U-type groove, The electric-conductor passes through the U-type groove.

3. short-circuit protection according to claim 2, it is characterised in that the attraction metalwork is rod like parts, including First end and the second end, the first end are rotatably connected on the housing of the miniature circuit breaker, and second end is free end.

4. short-circuit protection according to claim 3, it is characterised in that attract metalwork to be arranged at the U-type groove Top.

5. short-circuit protection according to claim 4, it is characterised in that the ferrous metal part has the corresponding attraction The hypotenuse portion of metalwork.

6. according to the short-circuit protection described in any one of claim 1 to 5, it is characterised in that the push piece is nonmetallic Part.

7. according to the short-circuit protection described in any one of claim 1 to 5, it is characterised in that one end of the ferrous metal part It is fixedly connected on the housing of the miniature circuit breaker.

8. a kind of miniature circuit breaker, including stationary contact portion, movable contact portion, kick component and short-circuit protection, the kick Driven during component kick the movable contact portion and the stationary contact part from, it is characterised in that the short-circuit protection is power Profit requires any one of 1 to 7 short-circuit protection.

9. miniature circuit breaker according to claim 8, it is characterised in that the miniature circuit breaker also include arc extinguishing component and Overtemperature protection component, the short-circuit protection are arranged between the arc extinguishing component and overtemperature protection component.

10. miniature circuit breaker according to claim 9, it is characterised in that the overtemperature protection component includes bimetal piece, The free end of the bimetal piece corresponds to the push piece and set.