CN101540248B - Low-voltage breaker - Google Patents
Low-voltage breaker Download PDFInfo
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- CN101540248B CN101540248B CN2009100296404A CN200910029640A CN101540248B CN 101540248 B CN101540248 B CN 101540248B CN 2009100296404 A CN2009100296404 A CN 2009100296404A CN 200910029640 A CN200910029640 A CN 200910029640A CN 101540248 B CN101540248 B CN 101540248B
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- arc
- arc extinguishing
- wall body
- pair
- extinguishing grid
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Abstract
The invention discloses a low-voltage breaker, belonging to the technical field of low-voltage breakers. The low-voltage breaker comprises a shell, at least one circuit breaking and arc extinguishing device, an operation mechanism capable of cutting off or closing and a tripping device. The circuit breaking and arc extinguishing device comprises an arc extinguishing chamber component and a contact component. The arc extinguishing chamber component comprises a plurality of arc extinguishing grid plates and an arc isolating cover. Each arc extinguishing grid plate is provided with a basal part and a pair of extending legs extending from one end of the basal part, the arc isolating cover is provided with a pair of first wall bodies, a pair of second wall bodies and a pair of third wall bodies, a plurality of arc extinguishing grid plates form a contact cavity, the contact component corresponds to the contact cavity, and the second wall bodies correspond to the interior of the contact cavity. The invention is characterized in that the arc isolating cover also comprises a pair of inner walls, each inner walls is jointed with one end of each second wall body near the basal part of each arc extinguishing grid plate, the other end of each second wall body is jointed with each third wall body, and each inner walls is provided with grids. The invention prevents ablation of electric arcs to the extending legs, can protect the extending legs, prolongs the service life of the arc extinguishing chamber component, achieves fast arc extinguishing effect, and enhances the breaking capacity.
Description
Technical field
The invention belongs to the low-voltage circuit breaker technical field, be specifically related to a kind of low-voltage circuit breaker.
Background technology
Low-voltage circuit breaker is by cutting-off of short-circuit electric current or overload current; use the electric equipment of protective circuit and load; the arc-control device that opens circuit that low-voltage circuit breaker comprises housing, be made of at least one contact assembly and arc control device assembly that at least one matches with contact assembly, can disconnect and closed operating mechanism and be used to order about the trip gear of described operating mechanism action; wherein; the basic function that the quick arc extinguishing ability of arc-control device of opening circuit is a circuit breaker also is the requirement of indispensability.The arc-control device that opens circuit comprises arc control device assembly and contact assembly, the arc control device assembly is the core component of arc-control device of opening circuit, the whether reasonable breaking capacity that tends to directly have influence on circuit breaker of its structure, because arc control device assembly role is: the electric arc that produces when cooling off cutting-off of short-circuit electric current or overload current rapidly, to improve the breaking capacity of circuit breaker.
Chinese invention patent application publication number CN1770351A discloses a kind of extinguisher assembly that is used for the circuit-breaker of molding outer casing, and the described extinguisher assembly of this patent application is the arc control device assembly.Above-mentioned patent application easily proposes the problem that the elongation pin of the arc extinguishing grid pieces of extinguisher assembly is ablated at existing electric arc in the prior art, and the structure of the arc-control device that opens circuit of its recommendation is by illustrated in figures 1 and 2.The arc-control device 1 that opens circuit comprises arc control device assembly 11 and the contact assembly 12 that is made of dynamic and static contact 121,122, arc control device assembly 11 comprise one group that be arranged in parallel with each other and respectively have the arc extinguishing grid pieces 111 and an a pair of arc cover 112 of a pair of elongation pin 1111.As shown in Figure 2, arc cover 112 has the 3rd wall body 1125, second wall body 1124 and first wall body 1123.The 3rd wall body 1125 connects mutually with the end of second wall body 1124 and first wall body 1123 respectively, constitutes the cavity 1121 (Fig. 1 shows) of a U-shaped; Constitute the grid sheet slot 1122 that equates with described arc extinguishing grid pieces 111 quantity on first wall body 1123, on first wall body 1123 and corresponding to grid sheet slot 1122 positions, also offer flat hole.The a pair of elongation pin 1111 of each arc extinguishing grid pieces 111 is arranged in the cavity 1121 of U-shaped, and the both sides of each arc extinguishing grid pieces 111 are positioned on the grid sheet slot 1122, and the both sides of the base portion 1112 of each arc extinguishing grid pieces 111 are extended with and set bead 1113, set bead 1113 and are embedded in the flat hole of being offered on first wall body 1123.The arc control device assembly 11 of the arc-control device 1 that opens circuit of said structure is with the elongation pin 1111 of each arc extinguishing grid pieces 111 cavity 1121 comprehensive surroundings by the U-shaped of arc cover 112 1 ends, can avoid extending pin 1111 and directly contact, reduce the ablation of grid sheet elongation pin 1111 with the arc column of electric arc 2 (Fig. 3 shows).But the applicant thinks, said structure still has shortcoming, specifically the arc path that can be shown by the arc control device assembly 11 by Fig. 3 signal is understood, because the self structure of arc cover 112 and arc cover 112 cooperate with elongation pin 1111, there is air-flow dead angle 21 in end near zone at elongation pin 1111, after electric arc 2 produced, electric arc 2 was detained in air-flow dead angle 21 and elongation pin 1111 is ablated, and undermined the useful life of arc extinguishing grid pieces 111; Again, because elongation pin 1111 regions are far away from arc center, therefore, this place (arcing gas that comprises this place) temperature is relatively low, free metal particle in the electric arc 2 very easily is trapped in the end of elongation pin 1111 and condense (deposition) becomes the solid metallic particle, can cause the short circuit between the arc extinguishing grid pieces 111 when serious, reduce the breaking capacity of circuit breaker.
Summary of the invention
Task of the present invention is to provide a kind of and can prevents effectively that electric arc from ablating to the elongation pin of the arc extinguishing grid pieces of arc control device assembly and preventing that metallic in the electric arc is deposited on and cause short circuit between the arc extinguishing grid pieces on the elongation pin and use the low-voltage circuit breaker that ensures desirable arc extinction performance and improve breaking capacity.
Task of the present invention is finished like this, a kind of low-voltage circuit breaker, comprise housing, be contained at least one arc-control device that opens circuit in the housing, can disconnect or closed operating mechanism and the trip gear that is used to drive described operating mechanism action, the described arc-control device that opens circuit comprises arc control device assembly and contact assembly, described arc control device assembly comprises a plurality of arc extinguishing grid pieces and arc cover, the a pair of elongation pin that each arc extinguishing grid pieces has a base portion and extends symmetrically from an end of described base portion, and arc-extinguish chamber has a pair of first wall body, a pair of second wall body and a pair of the 3rd wall body, described a plurality of arc extinguishing grid pieces is arranged in parallel with each other and constitutes contact cavities, described contact assembly is corresponding to described contact cavities, described second wall body is corresponding in the described contact cavities, it is characterized in that: described arc cover also comprises pair of inner wall, described inwall engages with an end of the base portion of the close arc extinguishing grid pieces of second wall body, the other end of described second wall body engages with the 3rd wall body, offers the grid that is used for inserting elongation pin on the described inwall.
In a specific embodiment of the present invention, the arc cover of described arc cover for adopting insulating material to make.
In another specific embodiment of the present invention, described first wall body engages with the 3rd wall body.
Go back in the specific embodiment of the present invention, the inboard of described first wall body constitutes grid sheet slot, and the quantity of grid sheet slot is to equate with the quantity of described arc extinguishing grid pieces.
In another specific embodiment of the present invention, the corresponding both sides of the base portion of each arc extinguishing grid pieces in described a plurality of arc extinguishing grid pieces constitute sets bead, is equipped with strutting piece on the bead setting.
The present invention is owing to improve the structure as the arc control device assembly of arc-control device, by on the arc cover, constituting inner wall, second wall body and the 3rd wall body, three's cooperation has avoided the elongation pin directly to contact with the electric arc arc column, prevents the ablation of electric arc to the elongation pin; Because the existence of inner wall, make the end of elongation pin no longer have air-flow dead angle resemble the prior art, therefore, prevented after electric arc enters the elongation pin, electric arc is detained and the elongation pin of ablating in the end of elongation pin, and avoided the metallic in the electric arc to cause problem of short-circuit extending deposition on the pin, thus the elongation pin that can adequately protect, the life-span of improving the arc control device assembly; Because the existence of second wall body and inner wall, thereby can dwindle the volume in electric arc arc column zone, increase air pressure, make electric arc enter arc extinguishing grid pieces fast, electric arc be cut apart, reach quick arc quenching effect, the breaking capacity of raising circuit breaker by arc extinguishing grid pieces.
Description of drawings
Fig. 1 is the structure chart of the arc-control device 1 that opens circuit of the low-voltage circuit breaker in the prior art.
Fig. 2 is the structure chart after the arc control device assembly 11 of Fig. 1 structure assembles.
Fig. 3 is the arc path schematic diagram of the arc control device assembly 11 of Fig. 1 structure.
Fig. 4 is the structure chart of low-voltage circuit breaker of the present invention.
Fig. 5 is the first example structure figure of the arc control device assembly 11 of the arc-control device 1 of low-voltage circuit breaker of the present invention.
Fig. 6 is the structure chart of arc cover 112 of the arc control device assembly 11 of Fig. 5 structure.
Fig. 7 is that arc extinguishing grid pieces 111 shown in Figure 5 is installed on the schematic diagram in the arc cover 112.
Fig. 8 is the second example structure figure of the arc control device assembly 11 of the arc-control device 1 of low-voltage circuit breaker of the present invention.
Fig. 9 is the 3rd example structure figure of the arc control device assembly 11 of the arc-control device 1 of low-voltage circuit breaker of the present invention.
Figure 10 is that arc extinguishing grid pieces 111 shown in Figure 9 is installed on the schematic diagram in the arc cover 112.
Figure 11 is the schematic diagram of Fig. 9 and arc cover 112 shown in Figure 10.
Figure 12 is the schematic diagram of arc-control device 1 that the arc control device assembly 11 of Fig. 6 structure is installed.
The arc path schematic diagram that Figure 13 is embodied for the arc control device assembly 11 shown in the embodiment 1 to 3.
Embodiment
Embodiment 1:
Ask for an interview Fig. 4, Fig. 5, Fig. 6, Fig. 7 and Figure 12,13, in Fig. 4, provided assembly relation identical with prior art by base 31, the housing 3 that lid 32 and panel 33 are constituted, because what illustrate among Fig. 4 is three utmost point dual-interruption point breakers, therefore three arc-control devices 1 that open circuit are arranged in three arc-control device chambeies 311 of opening circuit accordingly on the base 31, operating mechanism 4 be connected with the arc-control device 1 that opens circuit drive circuit breaker deciliter, be installed on the base 31, the trip gear 5 that equates with the quantity of the arc-control device 1 that opens circuit simultaneously matches with operating mechanism 4, drives operating mechanism 4 actions by it.In Figure 12, provided the structure of the arc-control device 1 that opens circuit of three utmost point dual-interruption point breakers shown in Figure 4, the arc-control device 1 that opens circuit comprises a pair of shape each other arc control device assembly 11 identical with structure and mounting means, a pair of shell 13 and the contact assembly 12 that is used to hold described arc control device assembly 11, and arc control device assembly 11 comprises that arc extinguishing grid pieces 111 and the present invention improve the arc cover 112 of structure.The contact assembly 12 of low-voltage circuit breaker comprises dynamic and static contact 121,122, and the dynamic and static contact of dynamic and static contact 121,122 is corresponding to by illustrated in Figure 5 and by arc extinguishing grid pieces 111 formed contact cavities 1115.
For above-mentioned dual-interruption point breaker, base 31 can omit, and directly constitutes (this is known technology, just repeats no more) here by shell 13.For the single-break circuit breaker, promptly every utmost point only is provided with a pair of sound contact, disposes an arc control device assembly 11, and the shell 13 of above-mentioned arc-control device 1 also can omit, and only comes arc control device assembly 11 is supported with spacing by base 31.Therefore, because present embodiment is at the circuit breaker of double break point, so in Fig. 4 and Figure 12, illustrated the shell 13 of arc-control device 1.
Please specifically see Fig. 5, Fig. 6 and Fig. 7, the arc cover 112 that provides is an independently integral body, its adopts for example plastics and form by mould is molded of insulating material, one end of arc cover 112 is not promptly sealed by the right-hand member of shown position state at present, so that one group of arc extinguishing grid pieces 111 is packed into, the other end of arc cover 112 is that the position placed in the middle of illustrated left end constitutes one with the shape of aforesaid contact cavities 1115 suitable and chamber V-shaped trend (not titled with symbol figure mark).On the corresponding inner wall of first wall body 1123 of arc cover 112, respectively offer and keep corresponding grid sheet slot 1122 each other, the quantity of grid sheet slot 1122 equates with the quantity of one group of arc extinguishing grid pieces 111, the quantity that there is shown one group of arc extinguishing grid pieces 111 is six pieces, the quantity of corresponding grid sheet slot 1122 also is six, but obviously should not be subjected to the illustrated restriction as embodiment.The left end (shown position is an example) of arc cover 112 by each a pair of first, the 3rd, second wall body 1123,1125,1124 connection, every setting out a pair of cavity 1121, second wall body 1124 is corresponding in the contact cavities 1115, inwall 1128 engages with an end of the base portion 1112 of the close arc extinguishing grid pieces 111 of second wall body 1124, offer grid 1129 on the inwall 1128, the size of grid 1129 should just in time match with the cross section of elongation pin 1111, its size should only be used for inserting for elongation pin 1111, Fig. 5 at present embodiment, in 6, can be clear that described grid sheet slot 1122 extends on the inner wall 1128, and opening 1126 be communicated with cavity 1121 by grid 1129.After each arc extinguishing grid pieces 111 is inserted on the corresponding grid sheet slot 1122, the a pair of elongation pin 1111 of one end of arc extinguishing grid pieces 111 (left end shown in Figure 5) just enters into corresponding cavity 1121, and the other end of arc extinguishing grid pieces 111 (right-hand member shown in Figure 5) is in the opening 1126 of base portion 1112 between first wall body 1123 of arc extinguishing grid pieces 111, because grid 1129 cooperates with elongation pin 1111, after elongation pin 1111 inserts grid 1129, make cavity 1121 and opening 1126 and contact cavities 1115 separate.
Ask for an interview Figure 13 and in conjunction with Figure 12, when the moving contact 121 of the contact assembly of illustrating among Figure 12 12 is scolded out with respect to fixed contact 122 when transshipping (circuit be short-circuited or), the electric arc 2 that is produced can not resemble prior art structure showed as shown in Figure 1 by situation illustrated in Figure 3.More particularly, owing on arc cover 112, constitute inwall 1128, inwall 1128 is adjacent with an end of the base portion 1112 of the close arc extinguishing grid pieces 111 of second wall body 1124 or claim to engage, elongation pin 1111 enters in the cavity 1121 after by the grid on the inner wall 1,128 1129, make technical scheme provided by the invention have following advantage everywhere at least: the first, can prevent effectively that the elongation pin 1111 of arc extinguishing grid pieces 111 from directly contacting with the electric arc arc column; Second, after electric arc produces, electric arc can permeate opening 1126 and contact cavities 1115, because the effect of inner wall 1128, cavity 1121 and opening 1126 and contact cavities 1115 are separated, make the end of elongation pin 1111 no longer have prior art air-flow dead angle 21 as shown in Figure 3, therefore prevented the ablation elongation pin 1111 that after electric arc 2 enters elongation pin 1111, causes in the delay of the end of elongation pin 1111, thereby can protect elongation pin 1111 fully, the useful life of improving arc control device assembly 11; The 3rd, because the existence of inner wall 1128 has stoped electric arc to enter cavity 1121, greatly reduced the accumulation (deposition) of metallic on elongation pin 1111 in the electric arc 2, prevent to be short-circuited at elongation pin 1111 places between the arc extinguishing grid pieces 111, guaranteed the arc quenching effect of arc extinguishing grid pieces 111; The 4th, because the existence of second wall body 1124 and inwall 1128, dwindled the volume in electric arc arc column zone, increased air pressure, make electric arc 2 enter the base portion 1112 of arc extinguishing grid pieces 111 fast through contact cavities 1115, cut apart by arc extinguishing grid pieces 111, reach the effect of quick arc extinguishing, improve the breaking capacity of low-voltage circuit breaker.
Embodiment 2:
Ask for an interview Fig. 8, in the present embodiment, the overall structure of arc cover 112 by embodiment 1 is divided into two, promptly becomes a pair of shape arc cover 112 all identical with structure, each arc cover 112 is corresponding to the corresponding elongation pin 1111 of arc extinguishing grid pieces 111, and all the other are all with the description to embodiment 1.
Embodiment 3:
Ask for an interview Fig. 9, Figure 10 and Figure 11, the quantity of arc-extinguish chamber 112 still is a pair of, constitute one in the corresponding both sides of the base portion 1112 of each arc extinguishing grid pieces 111 of one group of arc extinguishing grid pieces 111 and set bead 1113, and be equipped with pair of engage members 1114, on each strutting piece 1114, offer and set bead 1113 suitable flat holes and (among Fig. 9 and Figure 10 signal is arranged, but do not mark Reference numeral), obviously, set bead 113 and be embedded in the flat hole, connect thereby the base portion 1112 of one group of arc extinguishing grid pieces 111 is implemented supportive by pair of engage members 1114.In the present embodiment, only the elongation pin 1111 with each arc extinguishing grid pieces 111 is inserted in the arc cover 112, and base portion 1112 is positioned at outside (being stuck in) arc cover 112.All the other are all with the description to embodiment 1.
Claims (4)
1. low-voltage circuit breaker, comprise housing (3), be contained at least one arc-control device that opens circuit (1) in the housing (3), can disconnect or closed operating mechanism (4) and be used to drive the trip gear (5) that described operating mechanism (4) moves, the described arc-control device that opens circuit (1) comprises arc control device assembly (11) and contact assembly (12), described arc control device assembly (11) comprises a plurality of arc extinguishing grid pieces (111) and arc cover (112), the a pair of elongation pin (1111) that each arc extinguishing grid pieces (111) has a base portion (1112) and extends symmetrically from an end of described base portion (1112), and arc cover (112) has a pair of first wall body (1123), a pair of second wall body (1124) and a pair of the 3rd wall body (1125), described a plurality of arc extinguishing grid pieces (111) is arranged in parallel with each other and constitutes contact cavities (1115), described contact assembly (12) is corresponding to described contact cavities (1115), described second wall body (1124) is corresponding in the described contact cavities (1115), it is characterized in that: described arc cover (112) also comprises pair of inner wall (1128), described inwall (1128) engages with an end of the base portion (1112) of the close arc extinguishing grid pieces (111) of second wall body (1124), the other end of described second wall body (1124) engages with the 3rd wall body (1125), offer the grid (1129) that is used for inserting elongation pin (1111) on the described inwall (1128), described first wall body (1123) engages with the 3rd wall body (1125).
2. low-voltage circuit breaker according to claim 1 is characterized in that the arc cover of described arc cover (112) for adopting insulating material to make.
3. low-voltage circuit breaker according to claim 1 is characterized in that the inboard of described first wall body (1123) constitutes grid sheet slot (1122), and the quantity of grid sheet slot (1122) is to equate with the quantity of described arc extinguishing grid pieces (111).
4. low-voltage circuit breaker according to claim 1, the corresponding both sides that it is characterized in that the base portion (1112) of each arc extinguishing grid pieces (111) in described a plurality of arc extinguishing grid pieces (111) constitute sets bead (1113), is equipped with strutting piece (1114) on the bead (1113) setting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100296404A CN101540248B (en) | 2009-03-30 | 2009-03-30 | Low-voltage breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100296404A CN101540248B (en) | 2009-03-30 | 2009-03-30 | Low-voltage breaker |
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| Publication Number | Publication Date |
|---|---|
| CN101540248A CN101540248A (en) | 2009-09-23 |
| CN101540248B true CN101540248B (en) | 2011-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009100296404A Active CN101540248B (en) | 2009-03-30 | 2009-03-30 | Low-voltage breaker |
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| CN (1) | CN101540248B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102376474B (en) * | 2010-08-23 | 2014-05-28 | 上海电科电器科技有限公司 | High-breaking-capacity arc extinguish chamber of circuit breaker |
| CN102290300B (en) * | 2011-07-07 | 2013-11-06 | 西安交通大学 | Grid arc extinguish chamber for low voltage circuit breaker |
| EP2573783B1 (en) * | 2011-09-21 | 2017-03-08 | Siemens Aktiengesellschaft | Arcing chamber device for electromagnetic switching devices |
| CN104303253A (en) * | 2012-04-10 | 2015-01-21 | Abb技术有限公司 | Arc-quenching device of switch for low, medium and high voltage applications |
| KR101412593B1 (en) * | 2013-05-14 | 2014-06-26 | 엘에스산전 주식회사 | Arc extinguishing mechanism for molded case circuit breaker |
| CN103545132B (en) * | 2013-09-30 | 2016-03-02 | 浙江天正电气股份有限公司 | Miniature circuit breaker |
| CN104810222B (en) * | 2015-05-06 | 2017-01-04 | 北京人民电器厂有限公司 | The arc-chutes of a kind of fast arc extinction and apply the miniaturization chopper of these arc-chutes |
| WO2016197310A1 (en) * | 2015-06-09 | 2016-12-15 | 伊顿电力设备有限公司 | Electrical arc energy absorber used for switch cabinet |
| US10811207B2 (en) | 2018-07-18 | 2020-10-20 | Lsis Co., Ltd. | Arc extinguishing unit of molded case circuit breaker |
| CN113168983A (en) * | 2018-09-25 | 2021-07-23 | 黑格尔电镀物品股份公司 | Arc extinguishing device for an electrical protection apparatus and electrical protection apparatus comprising an arc extinguishing device |
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| US3422235A (en) * | 1966-01-28 | 1969-01-14 | Heinemann Electric Co | Arcing grid case support means |
| CN1770351A (en) * | 2004-10-21 | 2006-05-10 | Ls产电株式会社 | Arc extinguisher assembly for mould cased circuit breaker |
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| CN101540248A (en) | 2009-09-23 |
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