CN104134593A - Arc-control device and arc-control method of miniature circuit breaker - Google Patents
Arc-control device and arc-control method of miniature circuit breaker Download PDFInfo
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- CN104134593A CN104134593A CN201410406674.1A CN201410406674A CN104134593A CN 104134593 A CN104134593 A CN 104134593A CN 201410406674 A CN201410406674 A CN 201410406674A CN 104134593 A CN104134593 A CN 104134593A
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Abstract
The invention discloses an arc-control device and arc-control method of a miniature circuit breaker. The arc-control device comprises a plurality of first grid pieces (1), one or more arc-control grid piece components (2) and flash barriers (3). The arc-control grid piece components (2) are inserted between the first grid pieces (1) in a penetrating mode or arranged on the outer sides of the first grid pieces (1) at the two ends, the arc-control grid piece components (2) are parallel to the first grid pieces (1), the arc-control grid piece components (2) are spaced from the first grid pieces (1) by a distance to be overlaid, and the arc-control grid piece components (2) are fixed through the flash barriers (3). The arc-control grid piece components (2) comprise two parallel second grid pieces (24) which are spaced by a distance for being arranged, and the ends, close to electric-arc inlets of the circuit breaker, of the two second grid pieces (24) are connected to form ends (22) of the arc-control grid piece components (2). According to the arc-control device and arc-control method of the miniature circuit breaker, in the arc-control process, the magnetic blow force on electric arcs is increased, the burning loss condition of the roots of the first grid pieces is effectively avoided, and the arc-control effect is good.
Description
Technical field
The invention belongs to breaker technical field, particularly a kind of arc-control device of miniature circuit breaker and arc-suppressing method thereof.
Background technology
Miniature circuit breaker (English name: Miniature Circuit Breaker) claim again miniature circuit breaker (Micro Circuit Breaker); be applicable to exchange 50/60Hz, rated voltage 230/400V, rated current to the overload of 63A circuit and the use of short-circuit protection, also can be under normal circumstances as the use of the not frequent operation conversion of circuit.Miniature circuit breaker is mainly used in the places such as industry, business, high level and residential houses.
At present, miniature circuit breaker adopts grid sheet arc extinguishing technology conventionally, as shown in Figure 1, arc extinguishing grid pieces (in the present invention also referred to as first grid sheet) the 1st wherein, the part of being made by ferrimagnet, have U-shaped or V-type first grid sheet breach 12, one group of first grid sheet 1 proper alignment that quantity does not wait, interval is stacked and the flash barrier 3 made by insulating material is fixed together forms arc-control device.When electric arc that miniature circuit breaker disjunction short circuit current produces moves near arc-control device, existence due to ferromagnetism grid sheet, the magnetic field that arc current produces in air around makes the magnetization of grid sheet, grid sheet after magnetization produces electromagnetic force electric arc is pulled to arc-control device, by grid sheet, to the cutting apart with cooling of electric arc, electric arc will reduce gradually and extinguish.But in this existing arc-control device, because first grid sheet 1 is all the consistent also proper alignment of size shape, this divides circuit breaker to have no progeny the electric arc producing can not enter rapidly arc-control device, but at first grid sheet root 11 place's burned for long times of first grid sheet 1, cause the localized burn of arc extinguishing grid pieces serious, arc extinction performance reduces.
For this reason, in prior art, there is a kind of arc-control device that draws fin that has, as disclosed a kind of miniature circuit breaker and Novel arc extinguishing chamber in Chinese patent literature CN203013660U, comprise the holder housing that left plate, right plate and rear board are connected to form, between described left plate and right plate, be provided with and be some arc extinguishing grid pieces of arranging in gap, described arc extinguishing grid pieces upper center is provided with breach, in some described arc extinguishing grid pieces, have at least the breach two ends of a slice arc extinguishing grid pieces to be equipped with the guide fins toward projection, described guide fins is higher than the upper surface of described arc extinguishing grid pieces.But this arc-control device has just lengthened the striking length of one section of arc extinguishing grid pieces, can not obviously strengthen and inhale arc effect, be difficult to play the object that improves arc quenching effect, therefore this arc-control device improves not obvious to electric arc in the situation of root of notch scaling loss.
Summary of the invention
For this reason, technical problem to be solved by this invention is that existing arc-control device arc quenching effect is poor, the scaling loss situation of arc extinguishing grid pieces root is serious, and provides a kind of arc quenching effect good, can obviously improve arc-control device and the arc-suppressing method thereof of the miniature circuit breaker of arc extinguishing grid pieces root scaling loss situation.
For solving the problems of the technologies described above, the technical scheme of employing of the present invention is as follows:
A kind of arc-control device of miniature circuit breaker, comprise some parallel and first grid sheets that space one segment distance is stacked and for the flash barrier of fixing described first grid sheet, both sides and described first grid sheet that described flash barrier is arranged at described first grid sheet are vertical with described first grid sheet place plane away from a side and the described flash barrier of electric arc entrance, also comprise one or more arc extinguishing grid pieces assemblies, described arc extinguishing grid pieces assembly is interspersed between some described first grid sheets or is arranged at the outside of the described first grid sheet that is positioned at two ends, described arc extinguishing grid pieces assembly is parallel with described first grid sheet and space one segment distance is stacked and fixed by described flash barrier, the setting that is parallel to each other and is spaced a distance of adjacent described arc extinguishing grid pieces assembly, described arc extinguishing grid pieces assembly comprises two parallel and be spaced a distance and arrange second gate sheets, and two described second gate sheets are interconnected to form the end of described arc extinguishing grid pieces assembly near one end of described electric arc entrance.
In the arc-control device of above-mentioned miniature circuit breaker, the described end nipple of described arc extinguishing grid pieces assembly is the one end near described electric arc entrance for described first grid sheet.
In the arc-control device of above-mentioned miniature circuit breaker, described second gate sheet has second gate sheet breach near a side of described electric arc entrance, and described second gate sheet is not shorter than the first grid sheet root of described first grid sheet at the second gate sheet root of described second gate sheet indentation, there.
In the arc-control device of above-mentioned miniature circuit breaker, described second gate sheet root protrudes from described first grid sheet root.
In the arc-control device of above-mentioned miniature circuit breaker, two described second gate sheets are one-body molded, and described in one of them, second gate sheet forms described arc extinguishing grid pieces assembly to second gate sheet double flat described in another.
In the arc-control device of above-mentioned miniature circuit breaker, two described second gate sheets divide body formed and shape is identical, and the link of two described second gate sheets is by welding or overlapping mode or be fastened and connected together.
In the arc-control device of above-mentioned miniature circuit breaker, the link of two described second gate sheets has the contact-making surface being parallel to each other, and two described contact-making surfaces link together by welding or overlapping mode.
In the arc-control device of above-mentioned miniature circuit breaker, described second gate sheet forms two bifurcateds at described second gate sheet breach near described electric arc porch, described in one of them, bifurcated has kink, described in another, bifurcated is flat part, the end face of the described flat part of a described second gate sheet is suitable for propping up the inner surface of the described kink of second gate sheet described in another, correspondingly, the inner surface of the described kink of a described second gate sheet is suitable for propping up the end face of the described flat part of second gate sheet described in another, realizes the connection of two described second gate sheet links.
In the arc-control device of above-mentioned miniature circuit breaker, described second gate sheet forms two bifurcateds at described second gate sheet breach near described electric arc porch, described in one of them, bifurcated has kink, described in another, bifurcated is flat part, the end face of the described kink of a described second gate sheet is suitable for propping up the side of the described flat part of second gate sheet described in another, correspondingly, the side of the described flat part of a described second gate sheet is suitable for propping up the end face of the described kink of second gate sheet described in another, realizes the connection of two described second gate sheet links.
In the arc-control device of above-mentioned miniature circuit breaker, it is body formed that two described second gate sheets divide, and the link of two described second gate sheets links together by magnetic conductive board, and described magnetic conductive board is connected with two described second gate sheets respectively.
A kind of arc-suppressing method of arc-control device of above-mentioned miniature circuit breaker, when electric arc that disjunction short circuit current produces moves near described arc-control device, first described electric arc cut off by the second gate sheet root of arc extinguishing grid pieces assembly, make the end generation current of described arc extinguishing grid pieces assembly, described electric current produces magnetic field around in described end, formation makes described electric arc enter the magnetic blow-out power of described arc-control device, described electric arc accelerates to enter described arc-control device under the effect of described magnetic blow-out power, after entering described arc-control device, described electric arc is again cut off and carries out arc extinguishing by the first grid sheet root of described first grid sheet.
Technique scheme of the present invention has the following advantages compared to existing technology:
(1) arc-control device of miniature circuit breaker of the present invention and arc-suppressing method thereof, comprise first grid sheet, one or more arc extinguishing grid pieces assemblies and flash barrier, wherein arc extinguishing grid pieces assembly comprises two parallel and be spaced a distance and arrange second gate sheets, two second gate sheets interconnect near one end of circuit breaker arc entrance, formation can be by the end of electric current, this part is owing to can producing induced current and then produce magnetic field under arcing, when arc extinguishing, increase the magnetic blow-out power to electric arc, compare with the existing arc-control device only with magnetic attraction, can effectively accelerate the speed that electric arc enters arc-control device, reduce the time that electric arc stops at arc extinguishing grid pieces root, effectively improve arc extinguishing grid pieces (being first grid sheet) root scaling loss situation, arc quenching effect is good.
(2) arc-control device of miniature circuit breaker of the present invention and arc-suppressing method thereof, the end nipple that wherein preferred mode is arc extinguishing grid pieces assembly is the one end near electric arc entrance for first grid sheet, in arc extinguishing process, second gate sheet root is breaking arc in generation magnetic field, the end of arc extinguishing grid pieces assembly first, formation makes electric arc enter the magnetic blow-out power of arc-control device, protrude from first grid sheet larger near the end magnetic blow-out power of the arc extinguishing grid pieces assembly of electric arc arrival end, further accelerated the speed that electric arc enters arc-control device, improved arc extinguishing ability, it is slow that the electric arc of having determined in existing arc-control device enters arc-control device, electric arc is long in the localized burn time, the shortcoming that arc extinguishing ability is low.
(3) arc-control device of miniature circuit breaker of the present invention and arc-suppressing method thereof, wherein second gate sheet root protrudes from first grid sheet root or concordant with the second root.Particularly, when second gate sheet root protrudes from first grid sheet root, enter the arc-control device first scaling loss second gate of electric arc sheet root before, and then scaling loss first grid sheet root, be conducive to the protection of first grid sheet, further improve the scaling loss situation of first grid sheet root.
(4) arc-control device of miniature circuit breaker of the present invention and arc-suppressing method thereof, two second gate sheets can be one-body molded, and machine-shaping is very convenient.
(5) arc-control device of miniature circuit breaker of the present invention and arc-suppressing method thereof, two second gate sheets can divide body formed, the link of two second gate sheets is by welding or overlap or being fastened and connected together, or link together by magnetic conductive board grade in an imperial examination three connectors, connected mode can be varied, select as the case may be design, as long as two second gate sheets interconnect near one end of circuit breaker arc entrance.
Accompanying drawing explanation
For content of the present invention is more likely to be clearly understood, below according to a particular embodiment of the invention and by reference to the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is the schematic diagram of existing arc extinguishing device for small-sized breaker;
Fig. 2 is the schematic diagram of the arc-control device embodiment mono-of miniature circuit breaker of the present invention;
Fig. 3 is the vertical view of Fig. 2;
Fig. 4 is the schematic diagram of the embodiment of the present invention one arc extinguishing grid pieces assembly;
Fig. 5 is the schematic diagram of the embodiment of the present invention two arc extinguishing grid pieces assemblies;
Fig. 6 is the schematic diagram of the embodiment of the present invention three arc extinguishing grid pieces assemblies;
Fig. 7 is the schematic diagram of the embodiment of the present invention four arc extinguishing grid pieces assemblies;
Fig. 8 is the schematic diagram of the embodiment of the present invention five arc extinguishing grid pieces assemblies;
Fig. 9 is the schematic diagram of the embodiment of the present invention six arc extinguishing grid pieces assemblies.
In figure, Reference numeral is expressed as: 1-first grid sheet, 11-first grid sheet root, 12-first grid sheet breach, 2-arc extinguishing grid pieces assembly, 21-second gate sheet root, 22-end, 23-second gate sheet breach, 24-second gate sheet, 25-kink, 26-flat part, 3-flash barrier, 4-magnetic conductive board.
Embodiment
embodiment mono-
As shown in Figure 2, be the arc-control device of miniature circuit breaker of the present invention and the preferred embodiment of arc-suppressing method thereof.
Described arc-control device comprises some first grid sheets 1, one or more arc extinguishing grid pieces assembly 2 and flash barrier 3.
Described first grid sheet 1 is made by ferrimagnet, some described first grid sheets 1 are parallel and space one segment distance is stacked, described first grid sheet 1 has first grid sheet breach 12 in the side near circuit breaker arc entrance, and described first grid sheet 1 has first grid sheet root 11 at described first grid sheet breach 12 places.Described flash barrier 3 is for fixing described first grid sheet 1 and described arc extinguishing grid pieces assembly 2, and described flash barrier 3 is arranged at the both sides of described first grid sheet 1 and described first grid sheet 1 away from a side of electric arc entrance vertical with described first grid sheet 1 place plane.In the present invention, electric arc entrance refers to the entrance side of described arc-control device, i.e. right side in Fig. 2.
Described arc extinguishing grid pieces assembly 2 is interspersed between some described first grid sheets 1 or is arranged at the outside of the described first grid sheet 1 that is positioned at two ends, described arc extinguishing grid pieces assembly 2 is parallel with described first grid sheet 1 and space one segment distance is stacked, in the present embodiment, the quantity of described arc extinguishing grid pieces assembly 2 is one, and is arranged between described first grid sheet 1.As shown in Figure 3 and Figure 4, described arc extinguishing grid pieces assembly 2 comprises that two 24, two described second gate sheets 24 of second gate the sheet parallel and setting that is spaced a distance are interconnected to form the end 22 of described arc extinguishing grid pieces assembly 2 near one end of circuit breaker arc entrance.The described end 22 of described arc extinguishing grid pieces assembly 2 protrudes from described first grid sheet 1 near one end of described electric arc entrance.Described second gate sheet 24 has second gate sheet breach 23 in the side near described electric arc entrance, and described second gate sheet 24 has second gate sheet root 21 at described second gate sheet breach 23 places, and described second gate sheet root 21 protrudes from described first grid sheet root 11.In the present embodiment, two described second gate sheets 24 are one-body molded, and described in one of them, second gate sheet 24 forms described arc extinguishing grid pieces assembly 2 to second gate sheet 24 double flats described in another.
The arc-suppressing method of the described arc-control device of the present embodiment is: when electric arc that disjunction short circuit current produces moves near described arc-control device, first described electric arc cut off by the described second gate sheet root 21 of arc extinguishing grid pieces assembly 2, make described end 22 generation currents of described arc extinguishing grid pieces assembly 2, described electric current produces magnetic field around in described end 22, formation makes described electric arc enter the magnetic blow-out power of described arc-control device, described electric arc accelerates to enter described arc-control device under the effect of described magnetic blow-out power, after entering described arc-control device, described electric arc is again cut off and carries out arc extinguishing by the described first grid sheet root 11 of described first grid sheet 1.The present invention is by the electromagnetism arc blow-out power increasing, make electric arc more F.F. enter arc-control device, improve the arc extinction performance of circuit breaker.
embodiment bis-
As shown in Figure 5, the difference of the present embodiment and embodiment mono-is: in the arc-control device of the present embodiment, be provided with 2, two described arc extinguishing grid pieces assemblies 2 of two arc extinguishing grid pieces assemblies and be all arranged between described first grid sheet 1, and the setting that is parallel to each other, is spaced a distance.
embodiment tri-
The difference of the present embodiment and embodiment mono-is: in the arc-control device of the present embodiment, a plurality of arc extinguishing grid pieces assemblies 2 are set, and adjacent described arc extinguishing grid pieces assembly 2 setting that is parallel to each other and is spaced a distance, wherein two described arc extinguishing grid pieces assemblies 2 are arranged at the outside of the described first grid sheet 1 that is positioned at two ends, and described in other, arc extinguishing grid pieces assembly 2 is interspersed in described in each between first grid sheet 1.
As shown in Figure 6, described arc extinguishing grid pieces assembly 2 comprises two parallel and be spaced a distance and arrange second gate sheets 24, two described second gate sheets 24 are interconnected to form the end 22 of described arc extinguishing grid pieces assembly 2 near one end of circuit breaker arc entrance, in the present embodiment, two described second gate sheets 24 minutes are body formed and shape is identical, the link of two described second gate sheets 24 has the contact-making surface being parallel to each other, and two described contact-making surfaces link together by welding or overlapping mode.
In other embodiments, the link of two described second gate sheets 24 can also link together by the mode fastening, and the link at two described second gate sheets 24 arranges respectively projection and snapping hole, and described projection is connected by manner with snapping hole.
embodiment tetra-
As shown in Figure 7, the difference of the present embodiment and embodiment tri-is: second gate sheet 24 forms two bifurcateds at second gate sheet breach 23 near electric arc porch, described in one of them, bifurcated has kink 25, described in another, bifurcated is flat part 26, the end face of the described flat part 26 of a described second gate sheet 24 is suitable for propping up the inner surface of the described kink 25 of second gate sheet 24 described in another, correspondingly, the inner surface of the described kink 25 of a described second gate sheet 24 is suitable for propping up the end face of the described flat part 26 of second gate sheet 24 described in another, realize the connection of two described second gate sheet 24 links, certainly in order to be connected firmly, also can further weld.
embodiment five
As shown in Figure 8, the difference of the present embodiment and embodiment tetra-is: second gate sheet 24 forms two bifurcateds at second gate sheet breach 23 near electric arc porch, described in one of them, bifurcated has kink 25, described in another, bifurcated is flat part 26, the end face of the described kink 25 of a described second gate sheet 24 is suitable for propping up the side of the described flat part 26 of second gate sheet 24 described in another, correspondingly, the side of the described flat part 26 of a described second gate sheet 24 is suitable for propping up the end face of the described kink 25 of second gate sheet 24 described in another, realize the connection of two described second gate sheet 24 links, certainly in order to be connected firmly, also can further weld.
embodiment six
As shown in Figure 9, in the arc-control device of the present embodiment, an arc extinguishing grid pieces assembly 2 is set, described arc extinguishing grid pieces assembly 2 is interspersed between first grid sheet 1.
The present embodiment is with the difference of embodiment mono-: described arc extinguishing grid pieces assembly 2 comprises two parallel and be spaced a distance and arrange second gate sheets 24, two described second gate sheets 24 minutes are body formed, the link of two described second gate sheets 24 links together by magnetic conductive board 4, and described magnetic conductive board 4 is connected with two described second gate sheets 24 respectively.
In other embodiments, the setting position of arc extinguishing grid pieces assembly and magnitude setting can be selected as required, and for easy to process, second gate sheet root 21 also can be concordant with the second root 11.
Obviously, above-described embodiment is only for example is clearly described, and the not 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 exhaustive without also giving all execution modes.And the apparent variation of being extended out thus or change are still among the protection range in the invention.
Claims (11)
1. the arc-control device of a miniature circuit breaker, comprise some parallel and first grid sheets (1) that space one segment distance is stacked and for the flash barrier (3) of fixing described first grid sheet (1), both sides and described first grid sheet (1) that described flash barrier (3) is arranged at described first grid sheet (1) are vertical with described first grid sheet (1) place plane away from a side and the described flash barrier (3) of electric arc entrance, it is characterized in that: also comprise one or more arc extinguishing grid pieces assemblies (2), described arc extinguishing grid pieces assembly (2) is interspersed between some described first grid sheets (1) or is arranged at the outside of the described first grid sheet (1) that is positioned at two ends, described arc extinguishing grid pieces assembly (2) is parallel with described first grid sheet (1) and space one segment distance is stacked and fixing by described flash barrier (3), the setting that is parallel to each other and is spaced a distance of adjacent described arc extinguishing grid pieces assembly (2), described arc extinguishing grid pieces assembly (2) comprises two parallel and be spaced a distance and arrange second gate sheets (24), and two described second gate sheets (24) are interconnected to form the end (22) of described arc extinguishing grid pieces assembly (2) near one end of described electric arc entrance.
2. the arc-control device of miniature circuit breaker according to claim 1, is characterized in that: the described end (22) of described arc extinguishing grid pieces assembly (2) protrudes from described first grid sheet (1) near one end of described electric arc entrance.
3. the arc-control device of miniature circuit breaker according to claim 1 and 2, it is characterized in that: described second gate sheet (24) has second gate sheet breach (23) near a side of described electric arc entrance, and the second gate sheet root (21) that described second gate sheet (24) is located at described second gate sheet breach (23) is not shorter than the first grid sheet root (11) of described first grid sheet (1).
4. the arc-control device of miniature circuit breaker according to claim 3, is characterized in that: described second gate sheet root (21) protrudes from described first grid sheet root (11).
5. according to the arc-control device of the arbitrary described miniature circuit breaker of claim 1-4, it is characterized in that: two described second gate sheets (24) are one-body molded, described in one of them, second gate sheet (24) forms described arc extinguishing grid pieces assembly (2) to second gate sheet (24) double flat described in another.
6. according to the arc-control device of the arbitrary described miniature circuit breaker of claim 1-4, it is characterized in that: two described second gate sheets (24) are minute body formed and shape is identical, the link of two described second gate sheets (24) is by welding or overlapping mode or be fastened and connected together.
7. the arc-control device of miniature circuit breaker according to claim 6, is characterized in that: the link of two described second gate sheets (24) has the contact-making surface being parallel to each other, and two described contact-making surfaces link together by welding or overlapping mode.
8. the arc-control device of miniature circuit breaker according to claim 6, it is characterized in that: described second gate sheet (24) forms two bifurcateds at described second gate sheet breach (23) near described electric arc porch, described in one of them, bifurcated has kink (25), described in another, bifurcated is flat part (26), the end face of the described flat part (26) of a described second gate sheet (24) is suitable for propping up the inner surface of the described kink (25) of second gate sheet (24) described in another, correspondingly, the inner surface of the described kink (25) of a described second gate sheet (24) is suitable for propping up the end face of the described flat part (26) of second gate sheet (24) described in another, realize the connection of two described second gate sheets (24) link.
9. the arc-control device of miniature circuit breaker according to claim 6, it is characterized in that: described second gate sheet (24) forms two bifurcateds at described second gate sheet breach (23) near described electric arc porch, described in one of them, bifurcated has kink (25), described in another, bifurcated is flat part (26), the end face of the described kink (25) of a described second gate sheet (24) is suitable for propping up the side of the described flat part (26) of second gate sheet (24) described in another, correspondingly, the side of the described flat part (26) of a described second gate sheet (24) is suitable for propping up the end face of the described kink (25) of second gate sheet (24) described in another, realize the connection of two described second gate sheets (24) link.
10. according to the arc-control device of the arbitrary described miniature circuit breaker of claim 1-4, it is characterized in that: two described second gate sheets (24) divide body formed, the link of two described second gate sheets (24) links together by magnetic conductive board (4), and described magnetic conductive board (4) is connected with two described second gate sheets (24) respectively.
The arc-suppressing method of the arc-control device of miniature circuit breaker described in 11. 1 kinds of the claims 3, it is characterized in that: when electric arc that disjunction short circuit current produces moves near described arc-control device, first described electric arc cut off by the second gate sheet root (21) of arc extinguishing grid pieces assembly (2), make end (22) generation current of described arc extinguishing grid pieces assembly (2), described electric current produces magnetic field around in described end (22), formation makes described electric arc enter the magnetic blow-out power of described arc-control device, described electric arc accelerates to enter described arc-control device under the effect of described magnetic blow-out power, after entering described arc-control device, described electric arc is again cut off and carries out arc extinguishing by the first grid sheet root (11) of described first grid sheet (1).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410406674.1A CN104134593B (en) | 2014-08-18 | 2014-08-18 | A kind of arc-control device of miniature circuit breaker and arc-suppressing method thereof |
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| CN201410406674.1A CN104134593B (en) | 2014-08-18 | 2014-08-18 | A kind of arc-control device of miniature circuit breaker and arc-suppressing method thereof |
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| CN104134593B CN104134593B (en) | 2016-04-13 |
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| CN104538265A (en) * | 2014-11-28 | 2015-04-22 | 浙江正泰电器股份有限公司 | Arc extinguishing chamber and residual current operated circuit breaker |
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| CN104538265A (en) * | 2014-11-28 | 2015-04-22 | 浙江正泰电器股份有限公司 | Arc extinguishing chamber and residual current operated circuit breaker |
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| CN104134593B (en) | 2016-04-13 |
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