CN107946152B - Arc extinguishing chamber for miniature circuit breaker - Google Patents
Arc extinguishing chamber for miniature circuit breaker Download PDFInfo
- Publication number
- CN107946152B CN107946152B CN201711466260.8A CN201711466260A CN107946152B CN 107946152 B CN107946152 B CN 107946152B CN 201711466260 A CN201711466260 A CN 201711466260A CN 107946152 B CN107946152 B CN 107946152B
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- Prior art keywords
- arc
- fixing
- air outlet
- extinguishing grid
- extinguishing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/18—Means for extinguishing or suppressing arc
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- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention discloses an arc-extinguishing chamber for a small circuit breaker, which comprises two fixing plates and a plurality of arc-extinguishing grid plates arranged between the two fixing plates, wherein a plurality of groups of fixing mechanisms are uniformly distributed on the fixing plates, each fixing mechanism comprises a plurality of fixing holes, each arc-extinguishing grid plate comprises an air inlet end, an air outlet end and two side ends, two sides of the air outlet end on each arc-extinguishing grid plate are respectively in an outwards expanding arc-shaped structure, an inwards contracted air outlet channel is formed between the air outlet ends of two adjacent arc-extinguishing grid plates, one side, close to the air outlet end, of each side end on each arc-extinguishing grid plate is provided with a fixing right angle, a fixing block matched with the corresponding fixing hole is arranged at the position of the fixing right angle, and one end of each fixing block penetrates through the corresponding fixing hole. The arc extinguishing chamber has reasonable structural design and convenient and quick installation, can effectively avoid the phenomenon that metal particles in free steam of an arc easily return to the arc extinguishing chamber, and can effectively improve the cooling rate of the arc.
Description
Technical Field
The invention relates to the technical field of circuit breakers, in particular to an arc extinguishing chamber for a miniature circuit breaker.
Background
An arc is a gas discharge phenomenon, which is a momentary spark created by the passage of an electric current through a medium such as air. In daily life, when the current passing through the circuit breaker exceeds the limit value set by the circuit breaker, the circuit breaker automatically interrupts the current, and after a contact on the circuit breaker is opened, an electric arc is lightened, and the electric arc can damage equipment lines and even affect personal safety. Arc extinction is therefore one of the important applications of circuit breakers. Currently, the arc extinguishing methods commonly used in the prior art include a mechanical arc extinguishing method, a magnetic blow-out arc extinguishing method, a narrow slit arc extinguishing method and a grid arc extinguishing method.
When the contacts of the breaker are separated, the generated electric arc is pushed into a group of metal grids to be divided into a plurality of sections under the action of electric force, and each of the metal grids insulated from each other is equivalent to one electrode, so that a plurality of negative-positive voltage peaks exist. For alternating current arcs, a 150-250V method medium intensity appears near the cathode when the arc crosses zero, so that the arc cannot be continuously maintained and extinguished.
In the prior art, metal particles are contained in the arc gas, and the metal particles tend to cause short-circuiting of conductive parts or electrical devices around the circuit breaker. Therefore, in order to cool down and deionize the arc extinguishing gas, it is common practice to provide an arc extinguishing chamber outlet location with an deionization device.
Chinese patent document CN202258893U discloses an arc extinguishing chamber, including arc isolation cover, striking flake, two arc isolation walls, bars piece, arc extinguishing plate and go the net that leaves, wherein, install arc extinguishing plate and go the net that leaves from bottom to top in proper order between bars piece top and the arc isolation cover, arc extinguishing plate and the contact of bars piece top, the effect of arc extinguishing plate is to keep the clearance with bars piece, prevents the short circuit between bars piece, but increase intensity and better cooling electric arc simultaneously. The arc-extinguishing plate is perforated along the transverse axis, and in order not to affect air permeability, the size and arrangement of the holes are adapted to the intervals of the grid sheets, and the de-ionized net is placed on the arc-extinguishing plate. Because the de-ionization net is made of ferromagnetic materials, a strong induction magnetic field can be generated when an electric arc appears, the electric arc is pulled out of the grid sheet, and meanwhile, the electric arc possibly sprayed out of the arc spraying opening can be pulled back into the arc extinguishing chamber by the force generated by the induction magnetic field, so that the electric arc is prevented from flying out through the arc spraying opening on the arc extinguishing chamber. However, the whole structure of the arc-extinguishing chamber is relatively complex and is not in accordance with the use of a small-sized circuit breaker, and because the air holes on the arc-extinguishing plate are of a straight-through design, when the force generated by the induction magnetic field of the dissociation network pulls the arc possibly sprayed from the arc spraying opening back into the arc-extinguishing chamber, metal particles contained in the arc dissociation steam are returned to the arc-extinguishing chamber again, so that the density of the metal steam in the arc-extinguishing chamber is relatively improved; in addition, the size and arrangement of the holes on the arc-extinguishing plates are matched with the intervals of the grid plates, so that metal particles in free steam of an electric arc are more beneficial to returning to the arc-extinguishing chamber, and the dielectric strength of the arc-extinguishing chamber is reduced.
Disclosure of Invention
The invention aims to solve the problems, and provides the arc extinguishing chamber for the miniature circuit breaker, which has reasonable structural design and convenient and quick installation, can effectively avoid the phenomenon that metal particles in arc free steam are easy to return to the arc extinguishing chamber, and can effectively improve the arc cooling rate.
The invention adopts the following technical scheme:
the utility model provides an explosion chamber for miniature circuit breaker, includes two parallel and symmetry setting's fixed plate and a plurality of parallel arrangement arc-extinguishing bars piece between two fixed plates, evenly distributed has a plurality of fixed establishment of group along the length direction of fixed plate on the fixed plate, fixed establishment includes a plurality of fixed orifices along the width direction evenly distributed of fixed plate, the arc-extinguishing bars piece includes the inlet end, gives vent to anger the end and two relative side that set up, the both sides of giving vent to anger the end on the arc-extinguishing bars piece are the arc structure of outside expansion respectively, form an inwards shrink's passageway of giving vent to anger between the end of giving vent to anger of two adjacent arc-extinguishing bars piece, one side that is close to the end of giving vent to anger on the two side on the arc-extinguishing bars piece is equipped with an inwards concave fixed right angle respectively, the position department that corresponds the fixed orifices on the fixed right angle is equipped with the fixed block that matches with the fixed orifices, the one end of fixed block runs through in corresponding fixed orifices.
As a preferable technical scheme of the invention, a plurality of first air outlet holes are uniformly distributed on the fixed plate, a connecting plate is arranged on one side of the fixed plate, which is far away from the arc extinguishing grid sheet, a cavity is arranged between the connecting plate and the fixed plate, the first air outlet holes are communicated with the cavity, and a plurality of second air outlet holes communicated with the cavity are uniformly distributed on one end, close to the air outlet end of the arc extinguishing grid sheet, of the connecting plate.
As a preferable technical scheme of the invention, one end, close to the cavity, of the first air outlet hole is of a structure which is contracted inwards along the axis.
As a preferable technical scheme of the invention, the air inlet end of the arc extinguishing grid sheet is provided with an arc striking notch, the arc striking notch comprises a first section and a second section which are mutually connected, the first section is of a structure which is expanded along an outward arc in a direction away from the second section, the second section is of a U-shaped structure, and the central lines of the first section and the second section are overlapped with the central line of the arc extinguishing grid sheet.
As a preferable technical scheme of the invention, the fixing plate is made of air-out plastic.
As a preferable technical scheme of the invention, the number of the fixing holes on each group of the fixing mechanisms is 3.
The beneficial effects of the invention are as follows:
1. the invention has reasonable structural design, wherein the arranged arc-extinguishing grid plates and the fixed plates are tightly clamped and connected together through the fixed blocks and the fixed holes, compared with the prior art, the shock resistance effect of the arc-extinguishing grid plates can be greatly enhanced, and the working stability of the circuit breaker can be enhanced when the circuit breaker is used; meanwhile, the arc-extinguishing grid plates are arranged in a central symmetry mode, so that the arc-extinguishing grid plates are more convenient and quicker to assemble;
2. according to the invention, the two sides of the air outlet ends on the arc-extinguishing grid plates are respectively provided with the outward-expansion arc-shaped structures, so that an inward-contraction air outlet channel is formed between the air outlet ends of two adjacent arc-extinguishing grid plates, and the design can omit a bottom plate and an anti-dissociation device, so that the whole structure of the arc-extinguishing chamber is relatively simple, the assembly is convenient, the production cost is reduced, and the electric arc can be prevented from being discharged from the air outlet channel on the arc-extinguishing chamber and then returned to the arc-extinguishing chamber again, thereby effectively reducing the density of metal steam in the arc-extinguishing chamber and improving the dielectric strength;
3. the arc striking notch comprises a first section and a second section which are mutually connected, the first section is of a horn-shaped structure which expands outwards, and the second section is of a U-shaped structure, wherein the first section can strengthen the suction force of the arc extinguishing chamber to an arc, reduce the resistance when the arc enters the arc extinguishing chamber, thereby omitting an arc striking sheet arranged on the arc extinguishing chamber in the prior art and reducing the production process and the production cost of the arc extinguishing chamber; the second section can stretch the arc to improve the arc extinguishing efficiency of the arc extinguishing chamber; meanwhile, the arc striking notch is arranged, so that the arc striking effect and the stretching effect can be better achieved, meanwhile, the area of the arc extinguishing grid sheet is occupied to be small, the actual area of the arc extinguishing grid sheet is reversely increased, and the heat dissipation effect of the arc extinguishing chamber is improved;
4. the first air outlet hole, the cavity and the second air outlet hole enable the arc extinguishing chamber to be provided with one more exhaust channel, and the cavity can prolong the exhaust path of gas, so that the cooling effect of an electric arc is improved;
5. the fixing plate is made of the air-out plastic, the air-out plastic can bear high-temperature burning of an electric arc, and the air-out plastic can generate gas after being heated, so that an arc blowing effect is achieved, and the electric arc is pushed to move and cool.
Drawings
Fig. 1 is a schematic perspective view of an arc extinguishing chamber for a miniature circuit breaker according to the present invention;
fig. 2 is a schematic cross-sectional view of an arc chute for a miniature circuit breaker according to the present invention;
fig. 3 is a top view of an arc chute of the present invention;
the symbols in the drawings illustrate:
the arc extinguishing grid plate comprises a fixing plate 1, arc extinguishing grid plates 2, fixing holes 3, an air outlet channel 4, a fixing right angle 5, a fixing block 6, a first air outlet hole 7, a connecting plate 8, a cavity 9, a second air outlet hole 10, an arc striking notch 11, a first section 12 and a second section 13.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, an arc extinguishing chamber for a miniature circuit breaker comprises two parallel and symmetrically arranged fixing plates 1 and a plurality of parallel arc extinguishing grid plates 2 arranged between the two fixing plates 1, wherein a plurality of groups of fixing mechanisms are uniformly distributed on the fixing plates 1 along the length direction of the fixing plates 1, each fixing mechanism comprises three fixing holes 3 uniformly distributed along the width direction of the fixing plates 1, in practical application, the number of the fixing holes 3 can be selected according to practical needs, each arc extinguishing grid plate 2 comprises an air inlet end, an air outlet end and two opposite side ends, two sides of the air outlet end on each arc extinguishing grid plate 2 are respectively in an outwards-expanding arc-shaped structure, so that an inwards-contracted air outlet channel 4 is formed between the air outlet ends of two adjacent arc extinguishing grid plates 2, one side, close to the air outlet end, of each arc extinguishing grid plate 2 is respectively provided with an inwards-recessed fixing right angle 5, the fixing right angle 5 is provided with a fixing block 6 matched with the fixing hole 3, and the fixing block 6 is arranged at the position corresponding to the fixing hole 3, and the fixing block 6 is correspondingly connected with the fixing hole 3, so that the two arc extinguishing grid plates 2 are connected with one end of each arc extinguishing grid plate 2;
the fixed plate 1 is also uniformly provided with a plurality of first air outlets 7, one side of the fixed plate 1, which is away from the arc extinguishing grid sheet 2, is provided with a connecting plate 8, a cavity 9 is arranged between the connecting plate 8 and the fixed plate 1, the first air outlets 7 are communicated with the cavity 9, and a plurality of second air outlets 10 communicated with the cavity 9 are uniformly distributed at one end, close to the air outlet end of the arc extinguishing grid sheet 2, of the connecting plate 8; one end, close to the cavity 9, of the first air outlet hole 7 is of a structure which is contracted inwards along the axis, so that the electric arc can be prevented from being put back into the arc extinguishing chamber again after passing through the first air outlet hole 7, the density of metal steam in the arc extinguishing chamber is effectively reduced, and the dielectric strength is improved;
the arc striking notch 11 is arranged at the air inlet end of the arc extinguishing grid sheet 2, the arc striking notch 11 comprises a first section 12 and a second section 13 which are mutually connected, the first section 12 is of a structure which is outwards arc-expanded along the direction far away from the second section 12, the second section 13 is of a U-shaped structure, the central line of the first section 12 and the central line of the second section 13 are overlapped with the central line of the arc extinguishing grid sheet 2, and the arc extinguishing grid sheet 1 is of a central line symmetrical structure, so that the whole arc extinguishing chamber is assembled more conveniently and rapidly;
the fixing plate 1 is made of air-out plastic, and the fixing plate of the arc-extinguishing chamber of the miniature circuit breaker in the prior art is made of a red steel paperboard material, and in the breaking process, the red harbor paperboard is carbonized due to the high temperature effect of an arc, so that the arc-extinguishing grid plate cannot be kept at the original position, the effect of effectively cutting the arc can not be achieved, and the breaking effect is affected; in addition, the red cardboard material does not have the effect of generating gas to achieve arc blowing; the air-out plastic adopted by the invention can bear the high-temperature burning of the electric arc, and the air-out plastic can generate gas after being heated, so as to achieve the effect of blowing the electric arc, thereby pushing the electric arc to move and cool and improving the cooling rate of the electric arc.
Finally, it should be noted that: these embodiments are merely for illustrating the present invention and do not limit the scope of the present invention. Further, various other changes and modifications will be apparent to those skilled in the art from the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (5)
1. The utility model provides an explosion chamber for miniature circuit breaker, includes two parallel and symmetry setting fixed plate (1) and a plurality of parallel arrangement arc extinguishing bars piece (2) between two fixed plate (1), its characterized in that: the fixing plate (1) is uniformly provided with a plurality of groups of fixing mechanisms along the length direction of the fixing plate (1), each fixing mechanism comprises a plurality of fixing holes (3) uniformly distributed along the width direction of the fixing plate (1), each arc-extinguishing grid sheet (2) comprises an air inlet end, an air outlet end and two opposite side ends, two sides of the air outlet end on each arc-extinguishing grid sheet (2) are respectively of an outwards-expanded circular arc structure, an inwards-contracted air outlet channel (4) is formed between the air outlet ends of two adjacent arc-extinguishing grid sheets (2), one side, close to the air outlet end, of each side end on each arc-extinguishing grid sheet (2) is respectively provided with an inwards-concave fixing right angle (5), a fixing block (6) matched with the corresponding fixing hole (3) is arranged at the position of each fixing right angle (5), and one end of each fixing block (6) penetrates through the corresponding fixing hole (3);
the novel arc extinguishing device is characterized in that a plurality of first air outlet holes (7) are uniformly distributed in the fixed plate (1), a connecting plate (8) is arranged on one side, deviating from the arc extinguishing grid sheet (2), of the fixed plate (1), a cavity (9) is arranged between the connecting plate (8) and the fixed plate (1), the first air outlet holes (7) are communicated with the cavity (9), and a plurality of second air outlet holes (10) communicated with the cavity (9) are uniformly distributed in one end, close to the air outlet end of the arc extinguishing grid sheet (2), of the connecting plate (8).
2. The arc chute for a miniature circuit breaker of claim 1, wherein: one end, close to the cavity (9), of the first air outlet hole (7) is of a structure which is contracted inwards along the axis.
3. The arc chute for a miniature circuit breaker of claim 1, wherein: the arc extinguishing grid piece (2) is provided with an arc striking notch (11) at the air inlet end, the arc striking notch (11) comprises a first section (12) and a second section (13) which are mutually connected, the first section (12) is of a structure which is expanded along an outward arc away from the second section (13), the second section (13) is of a U-shaped structure, and the central line of the first section (12) and the central line of the second section (13) are overlapped with the central line of the arc extinguishing grid piece (2).
4. The arc chute for a miniature circuit breaker of claim 1, wherein: the fixing plate (1) is made of air-out plastic.
5. The arc chute for a miniature circuit breaker of claim 1, wherein: the number of the fixing holes (3) on each group of the fixing mechanisms is 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711466260.8A CN107946152B (en) | 2017-12-28 | 2017-12-28 | Arc extinguishing chamber for miniature circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711466260.8A CN107946152B (en) | 2017-12-28 | 2017-12-28 | Arc extinguishing chamber for miniature circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107946152A CN107946152A (en) | 2018-04-20 |
| CN107946152B true CN107946152B (en) | 2023-10-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711466260.8A Active CN107946152B (en) | 2017-12-28 | 2017-12-28 | Arc extinguishing chamber for miniature circuit breaker |
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| Country | Link |
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| CN (1) | CN107946152B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117727595B (en) * | 2024-02-07 | 2024-04-26 | 温州华嘉电器有限公司 | Arc extinguishing chamber of circuit breaker |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204289308U (en) * | 2015-01-15 | 2015-04-22 | 乐清市森恒电器有限公司 | A kind of circuit breaker |
| CN205595294U (en) * | 2016-03-14 | 2016-09-21 | 乐清市沃斯托电气有限公司 | Arcing chamber of breaker |
| CN206022153U (en) * | 2016-09-27 | 2017-03-15 | 浙江合兴电工有限公司 | A kind of arc quenching chamber structure |
| CN207966905U (en) * | 2017-12-28 | 2018-10-12 | 加西亚电子电器股份有限公司 | A kind of miniature circuit breaker arc-chutes |
-
2017
- 2017-12-28 CN CN201711466260.8A patent/CN107946152B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204289308U (en) * | 2015-01-15 | 2015-04-22 | 乐清市森恒电器有限公司 | A kind of circuit breaker |
| CN205595294U (en) * | 2016-03-14 | 2016-09-21 | 乐清市沃斯托电气有限公司 | Arcing chamber of breaker |
| CN206022153U (en) * | 2016-09-27 | 2017-03-15 | 浙江合兴电工有限公司 | A kind of arc quenching chamber structure |
| CN207966905U (en) * | 2017-12-28 | 2018-10-12 | 加西亚电子电器股份有限公司 | A kind of miniature circuit breaker arc-chutes |
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| Publication number | Publication date |
|---|---|
| CN107946152A (en) | 2018-04-20 |
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