CN202749266U - Air blowing type arc extinguishing cover - Google Patents
Air blowing type arc extinguishing cover Download PDFInfo
- Publication number
- CN202749266U CN202749266U CN 201220492130 CN201220492130U CN202749266U CN 202749266 U CN202749266 U CN 202749266U CN 201220492130 CN201220492130 CN 201220492130 CN 201220492130 U CN201220492130 U CN 201220492130U CN 202749266 U CN202749266 U CN 202749266U
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- air
- arc
- arc extinguishing
- cover plate
- pressure region
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Abstract
The utility model relates to an air blowing type arc extinguishing cover, which comprises an arc extinguishing shell, a static contact, and an air blowing cover, wherein the arc extinguishing shell is internally provided with a plurality of arc extinguishing grids; the static contact is arranged at the bottom of the arc extinguishing shell, and is matched with a moving contact of an operation mechanism for realizing switch-on and switch-off operations; the air blowing cover comprises high pressure zone cover plates and shunting zone cover plates; the inner walls of the high pressure zone cover plates can generate air to form a high pressure zone under the effect of arc burning; the air generates an air flow under the effect of pressure difference inside and outside the high voltage zone cover plates; the air flow is blown into the arc extinguishing grids through an air outlet opposite to the arc extinguishing grids; a rear part opening of the same width as the width of the static contact is arranged between the shunting zone cover plates; the shunting zones are formed inside the shunting zone cover plates; the shunting zones are directly communicated with the external space through the air flow channel; and the air flow enters the shunting zones and then enters the external space through the air flow channel, and is at last blown into the arc extinguishing grids.
Description
Technical field
The utility model relates to the arc-control device in a kind of mold cased circuit breaker, and specifically a kind of air-sweeping type arc-extinguish chamber that can be blown into by changing inflatable gas flow path direction and then minimizing the electric arc amount in the operating mechanism belongs to the low-voltage electrical applied technical field.
Background technology
The arc control device of existing breaker of plastic casing generally all are comprised of arc extinguishing grid pieces and gas exhausted material.When circuit breaker cut-offs, when dynamic/static contact separates, produce electric arc.Because the contact moving line of moving contact is in the cavity volume of the arc extinguishing grid pieces of arc-control device, therefore electric arc enters arc extinguishing grid pieces under electrodynamic action, electric arc is cut into the short arc of a series of series connection, electric arc is attenuated and improve fast arc voltage, thereby reach the effect of arc extinguishing.Simultaneously, when gas exhausted material disconnects at circuit breaker, can produce gas, form certain air-blowing air-flow, in the process of arc control device gas outlet motion, electric arc be blowed to grid sheet direction at gas.But because an opening that provides moving contact to enter the arc control device motion is provided at the arc control device rear portion, in the process of arc control device gas blast arc-quenching, the gas of some is towards this rear aperture direction motion, cause the decline of whole arc control device blast pressure, weaken the air-blowing effect, be unfavorable for improving the arc extinction performance of circuit breaker.And when circuit breaker cut-off, because the blast pressure insufficient strength, the metallic that electric arc or electrical arc erosion contact produce can be attached on the grid sheet, causes the short circuit between the grid sheet, reduces the break performance of circuit breaker.Therefore, how avoiding gas that electric arc is blown into rear aperture, make gas as much as possible blow to the arc control device gas outlet, is the significant problem that the technical staff need to solve.
Existing patent documentation CN 102427008A discloses a kind of arc-control device of moulding case low-voltage circuit breaker, it has the arc control device of a cavity body structure, be provided with the gas outlet on the antetheca of arc control device, be provided with a rear aperture on the rear wall of arc control device, the moving contact front end stretches into the arc control device inner chamber from the outside by rear aperture, and the moving contact front end connects a moving contact working of plastics, the upper part of moving contact working of plastics is fixedly connected with moving contact, the lower part of moving contact working of plastics is to be extended downwards and an elasticity bending boss of bending on the direction of moving contact contact by the rear portion of upper part, and the initial position of elasticity bending boss has angle respectively and between horizontal direction and the moving contact; The bottom of arc control device rear wall is provided with the boss that extends upward from the inside of rear aperture, boss and elasticity bending boss on the Width of the left and right sides size and rear aperture always, be provided with one at the front end of elasticity bending boss and scold evolution to the bending angle of bending to moving contact; When circuit breaker was in "on" position, elasticity bending angle boss was depressed into horizontal level by moving contact and is supported on the boss; Scold at moving contact and to reach the end during state, elasticity bending boss is positioned at the top envelope part rear aperture of boss.The purpose of technique scheme is to want the device of effective shutoff arc control device rear aperture, strengthens the inner blast pressure of arc control device, and the gas that gas exhausted material produces in the arc control device is moved towards the direction of the front gas outlet of arc control device as far as possible.But at least also there is following problem in such scheme:
(1) in this scheme, after bouncing fully, could realize moving contact the effective shutoff to the arc control device rear aperture, yet electric arc and γ-ray emission when beginning to scold out, moving contact are just arranged, therefore the generation of air-flow and injection just occur when moving contact is scolded out, and scold out to the process that bounces fully at moving contact, position more than the moving contact of arc control device rear aperture is not by effectively shutoff, so gas still can enter into operating mechanism by the part more than the moving contact moment.
(2) in this scheme, do not provide the selected material in elasticity bending boss place, if plastics are selected at elasticity bending boss place, its elastic performance is may not can up to standard, and in moving contact closed a floodgate the separating brake process frequently, the easy embrittlement of plastics meeting caused elasticity bending boss to lose efficacy; And if select the reasonable metal material of elastic effect, metal can produce magnetic attraction electric arc, when disjunction, the electric arc metallic elastic bending boss of can burning causes elasticity bending boss to lose efficacy.Therefore, the elasticity bending boss in the such scheme is difficult to choose suitable material and finishes above-mentioned functions in actual application, causes this scheme to implement very difficult.
(3) in this scheme, because the backward expansion being subject to the power of air-blowing after of bending angle, and rear aperture with the shutoff arc control device is blocked in the motion of scolding out of following moving contact to greatest extent.Yet, because its bottom is not subject to any limiting component, when air-blowing power is larger, elasticity bending boss can be blown afloat, make it continue backward motion, contact with the moving contact lower surface, such words just can't play and block with the effect of shutoff arc control device rear aperture.
(4) in this scheme, moving contact owing to being subject to the opposition of elastic plastic member and elasticity bending boss, affects its closing speed and clossing pressure when closing a floodgate.
In sum, in the technique scheme, can not realize effectively stoping electric arc to enter into operating mechanism in the moment that the gentle miscarriage of electric arc is given birth to, and owing to having added elastic plastic member on moving contact, also can have influence on closing speed and the clossing pressure of moving contact.
The utility model content
Technical problem to be solved in the utility model is air-sweeping type arc-extinguishing mechanism of the prior art, not only can't effectively reduce enter operating mechanism electric arc on the contrary owing to having increased closing speed and the clossing pressure of component affects moving contact, can effectively reduce the air-sweeping type arc-extinguish chamber that enters operating mechanism electric arc amount thereby provide a kind of.
For solving the problems of the technologies described above, the utility model provides a kind of air-sweeping type arc-extinguish chamber, comprising: the arc control device housing, and its inside is provided with some arc extinguishing grid pieces; Fixed contact is arranged at the bottom of described arc control device housing, and the moving contact of operating mechanism is mated to be realized closing a floodgate and sub-switching operation; Also comprise the air-blowing cover, be arranged at described arc extinguishing enclosure interior, comprise higher-pressure region cover plate and shunting zone cover plate; The inwall of described higher-pressure region cover plate can produce gas and form the higher-pressure region under the arc burning effect, described gas produces air-flow under the pressure difference effect inside and outside the cover plate of described higher-pressure region, described air-flow is blown in the described arc extinguishing grid pieces by the exhaust outlet relative with described arc extinguishing grid pieces; Be provided with the rear aperture consistent with described moving contact width between described shunting zone cover plate, form shunting zone in the described shunting zone cover plate, described shunting zone directly communicates by gas channel with the outer space of described higher-pressure region cover plate; Described air-flow enters described outer space by described gas channel after entering described shunting zone, then is blown in the described arc extinguishing grid pieces.
The width of described exhaust outlet is greater than the width of communication passage between described higher-pressure region cover plate and the described shunting zone cover plate.
Described communication passage has identical width with described rear aperture.
Also comprise quiet cover, be coated on outside the silver point of described fixed contact upper surface, be connected with the bottom contact of described higher-pressure region cover plate, the upper surface of described quiet cover produces gas under the arc burning effect.
The material of the upper surface of described quiet cover is PA66 or PBT or PA6 or ABS or POM or BMC or DMC.
The material of described higher-pressure region cover plate inwall is PA66 or PBT or PA6 or ABS or POM or BMC or DMC.
Described arc extinguishing grid pieces is U-shaped structure, and its U-shaped mouthful relative with described exhaust outlet.
Technique scheme of the present utility model has the following advantages compared to existing technology:
(1) air-sweeping type arc-extinguish chamber described in the utility model, comprise the air-blowing cover, the air-blowing cover comprises higher-pressure region cover plate and shunting zone cover plate, wherein cover plate inwall in higher-pressure region can produce gas and form the higher-pressure region under the arc burning effect, its material can decompose generation gas in the arc burning process, in the process of higher-pressure region cover plate inner-wall material burning, can absorb arc energy and cool off electric arc, realize preliminary arc extinguishing process; Simultaneously, because the pressure in the higher-pressure region increases suddenly, and it is less at higher-pressure region cover plate exterior lateral area pressure, formed larger pressure difference inside and outside the cover plate of higher-pressure region, the gas that then produces in the cover plate of higher-pressure region forms air-flow under the effect of pressure difference, air-flow is blown into arc extinguishing grid pieces by the exhaust outlet relative with arc extinguishing grid pieces, electric arc also can be blown in this process and carry out arc extinguishing in the arc extinguishing grid pieces.Simultaneously, in structure of the present utility model, the air-blowing cover also comprises the shunting zone cover plate, zone in the shunting zone cover plate is shunting zone, after the gas in the higher-pressure region enters into shunting zone, pressure in the shunting zone also can raise, and shunting zone directly communicates by gas channel with higher-pressure region cover plate outer space, therefore after the air pressure in the shunting zone raises, also can in shunting zone and between the cover plate outer space of higher-pressure region, form draught head, under the effect of this draught head, can produce air-flow, so air-flow the outer casing space of higher-pressure region cover plate can be entered into after by shunting zone, and then arc extinguishing grid pieces can be directly be blown into.Therefore the utility model can change the air-blowing direction of air-blowing cover by the structure of air-blowing cover rationally is set, so that most gas all is blown into the arc extinguishing grid pieces direction, the electric arc amount that enters into operating mechanism is considerably less, can ignore.
(2) air-sweeping type arc-extinguish chamber described in the utility model, the width of its exhaust outlet is greater than the width of communication passage between higher-pressure region cover plate and the shunting zone cover plate, then when the pressure of higher-pressure region becomes suddenly large, the gas flow of discharging by exhaust outlet can be far longer than the amount by the communication passage Exhaust Gas, and therefore a large amount of electric arc all is blown in the arc extinguishing grid pieces by exhaust outlet.
(3) air-sweeping type arc-extinguish chamber described in the utility model, also comprise quiet cover, and the upper surface of quiet cover also is to be prepared from by gas exhausted material, therefore when electric arc produces, the gas that quiet cover produces also can be assembled in the higher-pressure region, further strengthen the pressure in the higher-pressure region, so that the pressure in the higher-pressure region is larger with outside pressure difference, therefore more electric arc can be blown into the arc extinguishing grid pieces place.
Description of drawings
For content of the present utility model is more likely to be clearly understood, below in conjunction with accompanying drawing, the utility model is described in further detail, wherein,
Fig. 1 is the exploded view of arc-extinguish chamber described in the utility model;
Fig. 2 is the structural representation of air-blowing cover described in the utility model;
Fig. 3 is the structural representation of another angle of air-blowing cover described in the utility model;
Fig. 4 is the air-blowing cover air-blowing direction schematic diagram of an embodiment of the utility model;
Fig. 5 is the air-blowing cover air-blowing direction schematic diagram of an embodiment of the utility model;
Fig. 6 is the internal structure schematic diagram of arc-extinguish chamber described in the utility model;
Fig. 7 is the stereogram of arc-extinguish chamber described in the utility model;
Reference numeral is expressed as among the figure: 1-moving contact, 2-air-blowing cover, 3-arc extinguishing housing, the 4-fixed contact, the quiet cover of 5-, 21-higher-pressure region cover plate, 22-shunting zone cover plate, 23-connecting plate, 211-exhaust outlet, the 210-communication passage, 220-rear aperture, 61-outer space, the 62-gas channel, 31-arc extinguishing grid pieces, 41-silver point, 51-aerogenesis face, 52-wraps up groove.
Embodiment
The present embodiment provides a kind of air-sweeping type arc-extinguish chamber, comprising: arc extinguishing housing 3, its inside are provided with some arc extinguishing grid pieces 31; Fixed contact 4 is arranged at the bottom of described arc extinguishing housing 3, and the moving contact 1 of operating mechanism is mated to be realized closing a floodgate and sub-switching operation; Also comprise air-blowing cover 2, be arranged at described arc extinguishing housing 3 inside.
As shown in Figures 2 and 3, described air-blowing cover 2 comprises higher-pressure region cover plate 21 and shunting zone cover plate 22; And the bottom of described higher-pressure region cover plate 21 and described shunting zone cover plate 22 is fixed together by a plate 23; The inwall of described higher-pressure region cover plate 21 can produce gas and form the higher-pressure region under the arc burning effect, there is multiple material under the arc burning effect, to produce gas in the prior art, for example PA66(polyamide 66 or nylon 66), or PBT(polybutylene terephthalate (PBT), English name polybutylene terephthalate), PA6(polyamide 6 or nylon 6) or ABS(acrylonitrile-butadiene-styrene (ABS) plastics), the POM(Polyoxymethylene polyformaldehyde) or BMC(Bulk molding compounds, BMC), the DMC(MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride) etc. can realize.Produce described gas behind the gas and produce air-flow under the inside and outside pressure difference effect of described higher-pressure region cover plate 21, described air-flow is blown in the described arc extinguishing grid pieces 31, such as Fig. 4, Fig. 5 and shown in Figure 6 by the exhaust outlet 211 relative with described arc extinguishing grid pieces 31.
From above-mentioned figure, can find out, 22 of described shunting zone cover plates are provided with the rear aperture 220 consistent with described moving contact 1 width, described shunting zone cover plate 22 interior formation shunting zones, described shunting zone directly communicates by gas channel 62 with the outer space 61 of described higher-pressure region cover plate 21; Described air-flow is blown in the described arc extinguishing grid pieces 31 after entering described outer space 61 after by described shunting zone.
Obviously, after the gas in the higher-pressure region enters into shunting zone, pressure in the shunting zone also can raise, and shunting zone directly communicates by gas channel 62 with described outer space 61, therefore after the air pressure in the shunting zone raises, also can in shunting zone and between the described outer space 61, form draught head, under the effect of this draught head, can produce air-flow, therefore air-flow can enter into the outer casing space of higher-pressure region cover plate after by shunting zone, and then can directly be blown into arc extinguishing grid pieces.Therefore the utility model can change the air-blowing direction of air-blowing cover by the structure of air-blowing cover rationally is set, so that most gas all is blown into the arc extinguishing grid pieces direction, the electric arc amount that enters into operating mechanism is considerably less, can ignore.
Embodiment 2
The present embodiment is on the basis of embodiment 1, do following improvement, the width of described exhaust outlet 211 is greater than the width of communication passage 210 between described higher-pressure region cover plate 21 and the described shunting zone cover plate 22, and described communication passage 210 has identical width with described rear aperture 220.
In the practice process; as long as the width of described exhaust outlet is just passable greater than the width of described communication passage 210; and the shape that not necessarily limits described higher-pressure region cover plate 21 and described shunting zone cover plate 22 gets final product; as described in having provided two kinds such as Fig. 4 and Fig. 5 higher-pressure region cover plate 21 and as described in the shape schematic diagram of shunting zone cover plate 22, but those skilled in the art can be according to the structure of the described higher-pressure region cover plate 21 of derivative other shapes of record of the present embodiment and described shunting zone cover plate 22 within the application's protection range.
Embodiment 3
In conjunction with Fig. 1 and Fig. 7, the application can be drawn and on the basis of embodiment 1 or embodiment 2, following improvement can be done, also comprise quiet cover 5, be coated on by described parcel groove 52 outside the silver point 41 of described fixed contact 4 upper surfaces, be connected with the bottom contact of described higher-pressure region cover plate 21, the upper surface of described quiet cover 5 produces gas under the arc burning effect.The material of the upper surface of described quiet cover 5 is PA66(polyamide 66 or nylon 66), or PBT(polybutylene terephthalate (PBT), English name polybutylene terephthalate), PA6(polyamide 6 or nylon 6) or ABS(acrylonitrile-butadiene-styrene (ABS) plastics), the POM(Polyoxymethylene polyformaldehyde) or BMC(Bulk molding compounds, BMC), the DMC(MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride).Therefore, the aerogenesis face 51 of quiet cover 5 described in the present embodiment is that upper surface generation gas can directly enter described higher-pressure region, has further strengthened the air pressure of described higher-pressure region, so that current rate increases, can blow away more electric arc simultaneously to described arc extinguishing grid pieces 31.
More preferably, described arc extinguishing grid pieces 31 is U-shaped structure, and its U-shaped mouthful and described exhaust outlet 211 is relative.The resistance that the gas that can be more conducive to produce thus is subject to when described arc extinguishing housing 3 interior motion is less, and the time that enters in the arc extinguishing grid pieces is shorter, and realizes more fast arc extinguishing.
Need to prove, the utility model can increase the electric arc that is blown into described arc extinguishing grid pieces 31 by the mode that described shunting zone is set, and can a plurality of shunting zones be set according to the result of product during practical operation also passable, can produce better effect.
Obviously, above-described embodiment only is for example clearly is described, and is not the restriction to execution mode.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give all execution modes exhaustive.And the apparent variation of being extended out thus or change still are among the protection range of the invention.
Claims (7)
1. air-sweeping type arc-extinguish chamber comprises:
Arc extinguishing housing (3), its inside are provided with some arc extinguishing grid pieces (31);
Fixed contact (4) is arranged at the bottom of described arc control device housing (3), and the moving contact of operating mechanism (1) is mated to be realized closing a floodgate and sub-switching operation;
It is characterized in that:
Also comprise air-blowing cover (2), be arranged at described arc extinguishing housing (3) inside, comprise higher-pressure region cover plate (21) and shunting zone cover plate (22);
The inwall of described higher-pressure region cover plate (21) can produce gas and form the higher-pressure region under the arc burning effect, described gas produces air-flow under the pressure difference effect inside and outside the described higher-pressure region cover plate (21), described air-flow is blown in the described arc extinguishing grid pieces (31) by the exhaust outlet (211) relative with described arc extinguishing grid pieces (31);
Be provided with the rear aperture (220) consistent with described moving contact (1) width between described shunting zone cover plate (22), form shunting zone in the described shunting zone cover plate (22), described shunting zone directly communicates by gas channel (62) with the outer space (61) of described higher-pressure region cover plate (21); Described air-flow enters described outer space (61) by described gas channel (62) after entering described shunting zone, then is blown in the described arc extinguishing grid pieces (31).
2. air-sweeping type arc-extinguish chamber according to claim 1 is characterized in that:
The width of described exhaust outlet (211) is greater than the width of communication passage (210) between described higher-pressure region cover plate (21) and the described shunting zone cover plate (22).
3. air-sweeping type arc-extinguish chamber according to claim 2 is characterized in that:
Described communication passage (210) has identical width with described rear aperture (220).
4. arbitrary described air-sweeping type arc-extinguish chamber according to claim 1-3 is characterized in that:
Also comprise quiet cover (5), be coated on outside the silver point (41) of described fixed contact (4) upper surface, be connected with the bottom contact of described higher-pressure region cover plate (21), the upper surface of described quiet cover (5) produces gas under the arc burning effect.
5. air-sweeping type arc-extinguish chamber according to claim 4 is characterized in that:
The material of the upper surface of described quiet cover (5) is PA66 or PBT or PA6 or ABS or POM or BMC or DMC.
6. air-sweeping type arc-extinguish chamber according to claim 5 is characterized in that:
The material of described higher-pressure region cover plate (21) inwall is PA66 or PBT or PA6 or ABS or POM or BMC or DMC.
7. air-sweeping type arc-extinguish chamber according to claim 6 is characterized in that:
Described arc extinguishing grid pieces (31) is U-shaped structure, and its U-shaped mouthful relative with described exhaust outlet (211).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220492130 CN202749266U (en) | 2012-09-25 | 2012-09-25 | Air blowing type arc extinguishing cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220492130 CN202749266U (en) | 2012-09-25 | 2012-09-25 | Air blowing type arc extinguishing cover |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202749266U true CN202749266U (en) | 2013-02-20 |
Family
ID=47708627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220492130 Withdrawn - After Issue CN202749266U (en) | 2012-09-25 | 2012-09-25 | Air blowing type arc extinguishing cover |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202749266U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102881492A (en) * | 2012-09-25 | 2013-01-16 | 浙江天正电气股份有限公司 | Air-blowing arcing shield |
| CN114360980A (en) * | 2021-12-31 | 2022-04-15 | 浙江华楷电气有限公司 | Arc extinguishing device and circuit breaker |
-
2012
- 2012-09-25 CN CN 201220492130 patent/CN202749266U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102881492A (en) * | 2012-09-25 | 2013-01-16 | 浙江天正电气股份有限公司 | Air-blowing arcing shield |
| CN102881492B (en) * | 2012-09-25 | 2014-09-10 | 浙江天正电气股份有限公司 | Air-blowing arcing shield |
| CN114360980A (en) * | 2021-12-31 | 2022-04-15 | 浙江华楷电气有限公司 | Arc extinguishing device and circuit breaker |
| CN114360980B (en) * | 2021-12-31 | 2022-11-04 | 浙江华楷电气有限公司 | Arc extinguishing device and circuit breaker |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130220 Effective date of abandoning: 20140910 |
|
| RGAV | Abandon patent right to avoid regrant |