CN209947776U

CN209947776U - Arc extinguishing mechanism of miniature circuit breaker

Info

Publication number: CN209947776U
Application number: CN201920836703.6U
Authority: CN
Inventors: 杨峰
Original assignee: Zhejiang Nuok Electrical Polytron Technologies Inc
Current assignee: Zhejiang Nuok Electrical Polytron Technologies Inc
Priority date: 2019-06-04
Filing date: 2019-06-04
Publication date: 2020-01-14
Anticipated expiration: 2029-06-04

Abstract

The utility model relates to a miniature circuit breaker's arc extinguishing mechanism, including circuit breaker casing, explosion chamber, arc extinguishing mechanism and quiet touch panel, still include run-on piece and run-on piece down, arc extinguishing mechanism locates in run-on piece and the arc extinguishing chamber between the run-on piece down, and quiet touch panel includes the import section, the vertical section that forms of buckling downwards and the barb that upwards buckles and form, forms the slot between barb and the vertical section, goes up the run-on piece and includes straight piece, oblique piece and vertical piece, and oblique piece and vertical piece form the card and go into the connecting portion of above-mentioned slot, and the contained angle between barb and the vertical section is less than the contained angle between oblique piece and the vertical piece. Through setting up the striking piece and striking piece down, effectively increase the magnetism in the arc extinguish chamber, improve the arc extinguishing effect, in addition, through setting up connecting portion and the slot of mutual block on striking piece and static contact respectively, change traditional welding mode into the block and connect, the equipment of the striking piece of not only being convenient for and static contact has saved the welding step moreover, the cost is reduced when improving production efficiency.

Description

Arc extinguishing mechanism of miniature circuit breaker

Technical Field

The utility model relates to an arc extinguishing mechanism, concretely relates to miniature circuit breaker's arc extinguishing mechanism.

Background

A circuit breaker: a mechanical switch appliance can connect, bear and break the current under normal circuit condition, and also can bear a certain time and/or break the current when connecting or compounding faults under the specified abnormal circuit condition. The function of the circuit breaker is well known in the industry, and under a normal state, the smoothness of an electric circuit, namely a circuit, is ensured; when the circuit is in fault to generate short-circuit current or overcurrent is caused by overload, the load of the electric appliance is separated from the power supply network. For this purpose, the circuit breaker usually comprises a set of moving and stationary contacts. The miniature circuit breaker utilizes an electromagnetic release and a current thermal element to realize short-circuit protection and overcurrent protection, when the short-circuit current passing through a coil is larger than a set current value, a movable iron core of the electromagnetic release acts to push a striking rod to impact an operating mechanism, so that the operating mechanism is unlocked, and a movable contact piece and a static contact piece are driven to be separated.

A micro Circuit breaker, mcb (micro Circuit breaker) for short, is a terminal protection electrical appliance which is most widely used in a power distribution device of a building electrical terminal. The protection circuit is used for single-phase and three-phase short circuit, overload, overvoltage and the like below 125A, and comprises four types of a single pole 1P, a two-pole 2P, a three-pole 3P, a four-pole 4P and the like.

The arc extinguishing mechanism of current circuit breaker generally only sets up a slice striking piece, and magnetism is too low, and the striking effect is too poor, and in addition, current static contact links firmly through the welded mode with the striking piece, and the welded mode not only increases the cost, and the static contact after welding is difficult for assembling with the striking piece moreover.

SUMMERY OF THE UTILITY MODEL

To the not enough in the background art, the utility model provides a miniature circuit breaker's arc extinguishing mechanism.

The utility model adopts the technical proposal that: the utility model provides a miniature circuit breaker's arc extinguishing mechanism, includes circuit breaker casing, explosion chamber, arc extinguishing mechanism and quiet touch panel, still includes the run-on plate and run-on plate down, arc extinguishing mechanism locates in the run-on plate and the arc extinguishing chamber between the run-on plate down, quiet touch panel includes the import section, buckles the vertical section that forms downwards and the barb that upwards buckles and form, form the slot between barb and the vertical section, last run-on plate include straight piece, oblique piece and vertical piece form the card and go into the connecting portion of above-mentioned slot, contained angle between barb and the vertical section is less than the contained angle between oblique piece and the vertical piece.

Further, a rivet is connected between the inlet section and the vertical piece.

Further, be equipped with hypoplastron and curb plate on the casing of explosion chamber below, the run-on piece sets up along hypoplastron and curb plate down, be equipped with the breach on the curb plate, be equipped with the arc extinguishing short piece in the breach.

Furthermore, a limiting convex rib is arranged on the circuit breaker shell, which is far away from one side of the lower arc striking plate, of the notch.

Furthermore, the included angle between the lower plate and the side plate is 110-150 degrees.

Further, an arc baffle is arranged on the left side of the arc extinguishing mechanism, and a plurality of small holes are formed in the arc baffle.

Further, arc extinguishing mechanism includes a plurality of equidistant parallel arrangement's arc extinguishing bars piece and is used for the connecting plate with a plurality of arc extinguishing bars pieces at the connection, arc extinguishing bars piece bottom be equipped with the arc extinguishing breach of "people" style of calligraphy, the both sides of arc extinguishing bars piece have the spread groove, be equipped with connecting convex block in the spread groove, be equipped with on the connecting plate with above-mentioned connecting convex block assorted joint mouth.

Furthermore, the connecting lug is of a trapezoidal structure, and at least two connecting grooves are formed in two sides of the arc extinguishing grid piece.

The utility model has the advantages that: the utility model discloses a set up run-on plate and run-on plate down, effectively increase the magnetism in the arc extinguish chamber, improve the arc extinguishing effect, in addition, through connecting portion and the slot that sets up mutual block on run-on plate and static contact respectively, change traditional welding mode into the block and connect, the equipment of the run-on plate and static contact of not only being convenient for has saved the welding step moreover, has reduced the cost when improving production efficiency, has rational in infrastructure, low cost's advantage.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic view of the connection between the stationary contact plate and the upper arc runner.

Fig. 3 is a structural schematic view of the arc baffle.

Fig. 4 is a schematic structural diagram of an arc extinguishing mechanism.

Fig. 5 is a schematic structural diagram of an arc chute.

In the figure: 1. a circuit breaker housing; 2. an arc extinguishing chamber; 3. an arc extinguishing mechanism; 4. a stationary contact plate; 5. an upper arc striking sheet; 6. a lower arc striking sheet; 7. an inlet section; 8. a vertical section; 9. a barb; 10. a trench; 11. straightening; 12. oblique sheets; 13. a vertical sheet; 14. riveting; 15. a lower plate; 16. a side plate; 17. arc extinguishing short pieces; 18. limiting convex ribs; 19. an arc baffle; 20. a small hole; 21. arc extinguishing grid pieces; 22. a connecting plate; 23. an arc extinguishing gap; 24. connecting grooves; 25. a connection bump; 26. and (4) clamping the opening.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides a miniature circuit breaker's arc extinguishing mechanism.

In this embodiment, referring to fig. 1 to 5, this miniature circuit breaker's arc extinguishing mechanism includes circuit breaker casing 1, explosion chamber 2, arc extinguishing mechanism 3 and stationary contact plate 4, still includes run-on arc piece 5 and run-on arc piece 6 down, arc extinguishing mechanism 3 is located in the explosion chamber between run-on arc piece 5 and the run-on arc piece 6 down, stationary contact plate 4 includes import section 7, the vertical section 8 that bends down and the barb 9 that upwards buckles and form, form slot 10 between barb 9 and the vertical section 8, last run-on arc piece 5 include straight piece 11, sloping piece 12 and vertical piece 13 form the connecting portion that the card goes into above-mentioned slot 10, contained angle between barb and the vertical section is less than the contained angle between sloping piece and the vertical piece.

The utility model discloses a set up run-on plate and run-on plate down, effectively increase the magnetism in the arc extinguish chamber, improve the arc extinguishing effect, in addition, through connecting portion and the slot that sets up mutual block on run-on plate and static contact respectively, change traditional welding mode into the block and connect, the equipment of the run-on plate and static contact of not only being convenient for has saved the welding step moreover, the cost is reduced when improving production efficiency. During the equipment, install the stationary contact on the circuit breaker casing earlier, then will go up the connecting portion of striking piece and aim at the ditch inslot of stationary contact and install the striking piece on the circuit breaker casing, utilize the structural feature that the contained angle between barb and the vertical section is less than the contained angle between oblique piece and the vertical piece to clamp connecting portion at the ditch inslot, the installation is dismantled conveniently. Generally, the included angle between the barb and the vertical section is about 5-15 degrees smaller than the included angle between the oblique sheet and the vertical sheet, so that the installation is stable, and the clamping is convenient.

In the present invention, a rivet 14 is connected between the inlet section 7 and the vertical piece. The rivet 14 is arranged to play a role in auxiliary connection, so that the connection stability of the static contact plate and the upper arc striking plate is improved.

In the utility model, a lower plate 15 and a side plate 16 are arranged on the shell below the arc extinguish chamber, the lower arc striking plate 6 is arranged along the lower plate 15 and the side plate 16, a notch is arranged on the side plate 16, and an arc extinguish short plate 17 is arranged in the notch; a limiting convex rib 18 is arranged on the circuit breaker shell at one side of the notch, which is far away from the lower arc striking plate; the included angle between the lower plate 15 and the side plate 16 is 110-150 degrees. The arc extinguishing short piece increases the thickness of the lower arc striking piece, and the arc striking effect can be further improved. Wherein spacing protruding muscle and lower striking piece are mutually supported, improve the installation stability of arc extinguishing short piece.

An arc baffle plate 19 is arranged on the left side of the arc extinguishing mechanism, and a plurality of small holes 20 are formed in the arc baffle plate 19. The arc baffle plate 19 is used for reducing the external spraying of electric arcs, and meanwhile, the small holes are arranged to achieve a good heat dissipation effect.

The arc extinguishing mechanism comprises a plurality of arc extinguishing grid pieces 21 which are arranged in parallel at equal intervals and a connecting plate 22 for connecting the arc extinguishing grid pieces 21, wherein the bottom of each arc extinguishing grid piece 21 is provided with a herringbone arc extinguishing gap 23, two sides of each arc extinguishing grid piece 21 are provided with connecting grooves 24, connecting lugs are arranged in the connecting grooves, and the connecting plate is provided with clamping openings 26 matched with the connecting lugs 25; the connecting bump 25 is a trapezoidal structure, and at least two connecting grooves 24 are formed on two sides of the arc extinguishing grid piece. The arc extinguishing mechanism of this structure is connected through multi-disc arc extinguishing bars piece and connecting plate, and its simple structure, the equipment is convenient, connects stably moreover, has guaranteed the arc extinguishing quality of circuit breaker to improve the circuit breaker quality on the whole.

The utility model discloses a set up run-on plate and run-on plate down, effectively increase the magnetism in the arc extinguish chamber, improve the arc extinguishing effect, in addition, through connecting portion and the slot that sets up mutual block on run-on plate and static contact respectively, change traditional welding mode into the block and connect, the equipment of the run-on plate and static contact of not only being convenient for has saved the welding step moreover, has reduced the cost when improving production efficiency, has rational in infrastructure, low cost's advantage.

The skilled person should understand that: although the present invention has been described in terms of the above embodiments, the inventive concepts are not limited to the embodiments, and any modifications that utilize the inventive concepts are intended to be included within the scope of the appended claims.

Claims

1. The utility model provides a miniature circuit breaker's arc extinguishing mechanism, includes circuit breaker casing, explosion chamber, arc extinguishing mechanism and stationary contact plate, its characterized in that: still include run-on arc piece and run-on arc piece down, arc extinguishing mechanism locates in the run-on arc piece and the arc extinguish chamber between the run-on arc piece down, the stationary contact plate includes import section, the vertical section that forms of buckling downwards and the barb that upwards buckles and form, form the slot between barb and the vertical section, last run-on arc piece include straight piece, oblique piece and vertical piece form the card and go into the connecting portion of above-mentioned slot, contained angle between barb and the vertical section is less than the contained angle between oblique piece and the vertical piece.

2. An arc extinguishing mechanism of a small-sized circuit breaker according to claim 1, wherein: and a rivet is connected between the inlet section and the vertical piece.

3. An arc extinguishing mechanism of a small-sized circuit breaker according to claim 1, wherein: be equipped with hypoplastron and curb plate on the casing of explosion chamber below, the arc striking piece sets up along hypoplastron and curb plate down, be equipped with the breach on the curb plate, be equipped with the arc extinguishing short piece in the breach.

4. An arc extinguishing mechanism of a small-sized circuit breaker according to claim 3, wherein: and a limiting convex rib is arranged on the circuit breaker shell at one side of the notch, which is far away from the lower arc striking plate.

5. An arc extinguishing mechanism of a small-sized circuit breaker according to claim 3, wherein: the included angle between the lower plate and the side plate is 110-150 degrees.

6. An arc extinguishing mechanism of a small-sized circuit breaker according to claim 1, wherein: the arc extinguishing mechanism is characterized in that an arc baffle is arranged on the left side of the arc extinguishing mechanism, and a plurality of small holes are formed in the arc baffle.

7. An arc extinguishing mechanism of a small-sized circuit breaker according to any one of claims 1 to 6, wherein: arc extinguishing mechanism includes a plurality of equidistant parallel arrangement's arc extinguishing bars piece and is used for the connecting plate with a plurality of arc extinguishing bars pieces are being connected, arc extinguishing bars piece bottom be equipped with the arc extinguishing breach of "people" style of calligraphy, the both sides of arc extinguishing bars piece have the spread groove, be equipped with connecting lug in the spread groove, be equipped with on the connecting plate with above-mentioned connecting lug assorted joint mouth.

8. An arc extinguishing mechanism of a small-sized circuit breaker according to claim 7, wherein: the connecting lug is of a trapezoidal structure, and at least two connecting grooves are formed in two sides of the arc extinguishing grid piece.