CN102427009A - Arc blowing device for low-voltage circuit breaker - Google Patents
Arc blowing device for low-voltage circuit breaker Download PDFInfo
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- CN102427009A CN102427009A CN2011103541814A CN201110354181A CN102427009A CN 102427009 A CN102427009 A CN 102427009A CN 2011103541814 A CN2011103541814 A CN 2011103541814A CN 201110354181 A CN201110354181 A CN 201110354181A CN 102427009 A CN102427009 A CN 102427009A
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- arc
- contact
- control device
- fixed contact
- arc extinguishing
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Abstract
The invention discloses an arc blowing device for a low-voltage circuit breaker. A bracket is arranged at the lower part of an arc extinguishing chamber; a connecting end at the front end of a static contact can be pivotally connected with the bracket; two first grooves are respectively arranged at the left side and the right side of the rear part of the bracket; magnetism-increasing parts are arranged on the first grooves; the bottom surfaces of the magnetism-increasing parts are fixedly arranged in the first grooves; the side surfaces of the magnetism-increasing parts upwards extend to the outer part of the arc extinguishing chamber; contact ends of a movable contact and the static contact are positioned between the side surfaces of the two magnetism-increasing parts or at the positions close to the front ends of the two magnetism-increasing parts; a connecting plate is arranged at the rear part of the bracket; a magnetic conducting part is arranged between the static contact and the intermediate section of the connecting plate and is also positioned below an arc extinguishing grid plate; the upper section of the magnetic conduction part extends into the arc extinguishing chamber and is parallel to the arc extinguishing grid plate at a clearance; the contact end of the static contact is inclined; the magnetism-increasing parts can be used for enhancing an arc blowing magnetic field and increasing the repelling-open speed of the static contact; and the magnetic conducting part can be used for centralizing a magnetic filed generated by the connecting plate at the electric arc to the part, so that the stay time of the electric arc at the contact is effectively reduced and the entrance of the electric arc into the arc extinguishing device is accelerated.
Description
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Technical field
The present invention relates to a kind of high breaking low-voltage circuit breaker, particularly have the arc blow-out device of quick arc blow-out and extinguish arcs ability in its contact system.
Background technology
Current limliting and arc extinction performance are the important performance indexes of breaker of plastic casing, and will promote this index, and key is to accelerate the dynamic/static contact separating rate, elongate electric arc, and the arc root is shifted as early as possible, accelerate electric arc and get into arc extinguishing grid pieces.Existing high breaking circuit breaker adopts dynamic/static contact to scold out simultaneously, increases the distance of opening between the contact, elongates electric arc with this, increases the growth that arc voltage comes limiting short-circuit current.Yet high breaking low-voltage circuit breaker segmentation ability is higher; The energy that produces is also bigger; Producing Arc Temperature can be up to thousands of degree centigrade; Electric arc stops the scaling loss of contact also bigger on contact, and whether electric arc can not only influence the segmentation ability of circuit breaker from rapid transfer on the contact, and determined the useful life of contact.
One Chinese patent application number is 200810018563.8; Title is that " contact system of low-voltage circuit breaker " put down in writing on conductive component and extended one corresponding to the front end of contact down and be used to scoop out from the electric arc of the contact surface of contact down and with the striking parts of the arc transfer that is scooped out; The purpose that the striking parts are set is in order to descend the arc transfer of contact; Avoid electric arc burning on the contact down with this, ensure that circuit breaker has good connecting-disconnecting function.Conductive component global shape in this structure is tending towards zigzag, and when electric current passed through, the middle and lower part of zigzag can produce a magnetic field that stops electric arc to the arc extinguishing grid pieces motion, influences arc transfer to the striking parts, has increased the scaling loss degree of electric arc to following contact.Though the centered beneath portion at the striking parts offers a groove,, can not change conductive component equally effectively and produce the magnetic field of prevention electric arc to the arc extinguishing grid pieces motion because of receiving the restriction in shape and space.
Summary of the invention
The objective of the invention is to overcome the defective that above-mentioned low-voltage breaker contact system exists, provide a kind of and can increase contact arc blow-out magnetic field intensity, the arc blow-out device that electric arc is shifted from contact rapidly.
For realizing above-mentioned purpose, the present invention adopts following technical scheme: comprise arc control device, the arc control device bottom is a support; In the arc control device inner chamber arc extinguishing grid pieces is set; The back-end contacts end of moving contact stretches in the arc control device inner chamber, and the front end link of fixed contact connects support pivotly, and the back-end contacts end of fixed contact stretches in the arc control device inner chamber and is positioned at the bottom of arc extinguishing grid pieces; The support rear portion each side have one first groove; First groove is provided with and increases magnet assembly, increases magnet assembly and is made up of bottom surface and side, and the bottom surface that increases magnet assembly is fixedly installed in first groove; The side that increases magnet assembly extends upward the outside in arc control device, and the tip side of dynamic/static contact is between two said sides that increase magnet assembly or the deflection front end; The support rear portion is provided with a joint cover; The Z font structure that joint cover is made up of three sections of upper, middle and lower; Between the stage casing of fixed contact and joint cover and be positioned at arc extinguishing grid pieces below magnetic conductive part is set; The hypomere of the affixed joint cover of hypomere of magnetic conductive part, the epimere of magnetic conductive part stretch in the arc control device and are parallel to arc extinguishing grid pieces with a gap and tilt towards the tip side of fixed contact.
The magnet assembly that increases of the present invention can strengthen arc blow-out magnetic field and accelerates fixed contact and scold out speed; Magnetic conductive part can make the magnetic field concentration of joint cover generation at the electric arc place to these parts; Electric arc is shifted from contact rapidly; Effectively reduce the time of staying of electric arc on contact, reduce the scaling loss that contact receives electric arc, accelerate electric arc and get into arc-control device.
Description of drawings
Fig. 1 is a surface structure diagrammatic sketch of the present invention;
Fig. 2 is the half sectional view of Fig. 1;
Fig. 3 is the configuration diagram after Fig. 1 removes arc control device 12 and interior arc extinguishing grid pieces 13 thereof;
Fig. 4 is the configuration diagram of Fig. 1 medium-height trestle 4;
Fig. 5 is that the structure that increases magnet assembly 6 among Fig. 1 is amplified diagrammatic sketch;
Fig. 6 is that the structure of magnetic conductive part 5 among Fig. 1 is amplified diagrammatic sketch;
Fig. 7 is arc quenching principle figure of the present invention;
Among the figure: 1. moving contact; 2. rotating shaft; 3. fixed contact; 4. support; 5. magnetic conductive part; 6. increase magnet assembly; 7. joint cover; 8. torsion spring; 9. first; 10. second; 12. arc control device; 13. arc extinguishing grid pieces; 14. be flexible coupling; 41. hole; 42. stopper slot; 43. first groove; 45. second groove; 51. the epimere of magnetic conductive part; 52. the hypomere of magnetic conductive part; 53. the stage casing of magnetic conductive part; 61. increase the side of magnet assembly; 62. increase the bottom surface of magnet assembly; 72. the stage casing of joint cover; 73. the hypomere of joint cover.
Embodiment
Shown in Fig. 1-3, the present invention includes arc control device 12, moving contact 1 and fixed contact 3, arc control device 12 bottoms are supports 4, in arc control device 12 inner chambers arc extinguishing grid pieces 13 are set.The front end of moving contact 1 is a round end, and round end connects rotating shaft 2, and is positioned at arc control device 12 outsides, and the rear end of moving contact 1 is a tip side, and tip side stretches in arc control device 12 inner chambers; The front end of fixed contact 3 is links, and link is connected on the support 4 pivotly, and the rear end of fixed contact 3 is tip sides, and tip side stretches in arc control device 12 inner chambers and is positioned at the bottom of arc extinguishing grid pieces 13, and corresponding with the tip side of moving contact 1.
As shown in Figure 4; Support 4 is a symmetrical working of plastics structure; Support 4 middle parts each side have one second groove 45, support 4 rear portions each side have one first groove 43, on first groove 43 of the left and right sides at support 4 rear portions, install and increase magnet assembly 6.Two holes 41 are arranged on second groove, 45 places at support 4 middle parts symmetrically.Pass fixed contact 3 and two holes 41 for first 9, fixed contact 3 is rotated around first 9 pivotly.Shown in Fig. 1-3, respectively be with a torsion spring 8 at first 9 two ends, torsion spring 8 one ends are stuck on second groove 45, and the other end is connected with second 10.Pass second groove, 45 places that fixed contact 3 and 42, two stopper slots 42 of two stopper slots are arranged on support 4 middle parts for second 10.Stopper slot 42 defines fixed contact 3 around first 9 angle of rotating; The elastic force direction that torsion spring 8 provides is towards moving contact 1; Fixed contact 3 dorsad, order about fixed contact 3 and can move towards moving contact 1 direction, provide contact force and fixed contact 3 to be scolded out the restorable restoring force in back to dynamic/static contact.
As shown in Figure 5, increase magnet assembly 6 usefulness permeability magnetic materials and process, be a bifacial at least bending structure, form by bottom surface and side.Like Fig. 1-3, the magnet assembly 6 that increases of the present invention has two, and each bottom surface 62 that increases magnet assembly is fixedly mounted in first groove 43 of support 4, and first groove 43 has reliably guaranteed to increase the bottom surface 62 of magnet assembly and the insulation of arc extinguishing grid pieces 13 grades.Each side 61 that increases magnet assembly extends upward, and all is positioned at the outside of arc control device 12.Like this, two increase magnet assembly 6 and are installed on the support 4 back and form a U type structure, and the opening direction of U type structure is towards the tip side of dynamic/static contact; Make the tip side of dynamic/static contact between the opening of U type structure, perhaps be partial to front end; Like this, when producing electric arc between the dynamic/static contact, fixed contact 3 increases the magnetic line of force that forms between the magnet assembly 6 two; Can effectively electric arc be blowed on the arc extinguishing grid pieces 13 in the arc control device 12, quickly extinguish arcs.
A joint cover 7 is installed at support 4 rear portions; Joint cover 7 roughly is a structure that is bent into the Z font; Be made up of for three sections upper, middle and lower, hypomere 73 is positioned at bottom, support 4 back, between the front end link of the hypomere 73 of joint cover 7 and fixed contact 3, is to be flexible coupling 14; 14 1 ends that are flexible coupling are welded on the hypomere 73 of joint cover 7, and the other end is welded on the fixed contact 3.This joint cover 7 also can by last, in two sections form, 14 1 ends that are flexible coupling are welded on the joint cover stage casing 72, the other end is welded on the fixed contact 3.
Between the stage casing 72 of fixed contact 3 and joint cover, and be positioned at the below of arc extinguishing grid pieces 13, magnetic conductive part 5 be installed on the joint cover 7 through methods such as screw or riveted joints.As shown in Figure 6, magnetic conductive part 5 usefulness permeability magnetic materials process, and are structures that is bent into the Z font.By last, in, following three sections compositions.The hypomere 52 of magnetic conductive part is fixedly connected on the hypomere 73 of joint cover; The epimere 51 of magnetic conductive part stretches in the arc control device 12 and is roughly parallel to arc extinguishing grid pieces 13; And the epimere 51 of magnetic conductive part tilts towards the tip side of fixed contact 3; And between the nethermost arc extinguishing grid pieces 13 gap is arranged, get into arc extinguishing grid pieces 13 extinguish arcs thereby help electric arc, the stage casing 53 of magnetic conductive part is corresponding with the tip side height of fixed contact perpendicular to the hypomere and the height of joint cover.
As shown in Figure 7; The operation principle of the quick arc blow-out of the present invention is: under dynamic/static contact is in closure state; When short circuit current passes through contact system,, between dynamic/static contact, can produce electrodynamic repulsion force owing to flow through the current opposite in direction of fixed contact 3 and moving contact 1; Under the effect of electrodynamic repulsion force, dynamic/static contact can be scolded and held.When moving contact 1 to away from the motion of the direction of fixed contact 3 time, fixed contact 3 produces electric arc to the direction motion away from moving contact 1 between the dynamic/static contact.Simultaneously, the stage casing 72 on the joint cover 7 has magnetic field with hypomere 73 and produces when electric current flows through, judge with left hand rule; The Lorentz force F1 that this magnetic field produces at the electric arc place makes electric arc blow to the direction away from arc extinguishing grid pieces 13; Therefore, the present invention installs a magnetic conductive part 5 and increases magnet assembly 6 between fixed contact 3 and joint cover 72, this magnetic conductive part 5 and increase the magnet assembly magnetic permeability much larger than air; When joint cover 7 passes through electric current; The magnetic field that the stage casing 72 of joint cover 7 and hypomere 73 produce can and increase on the bottom surface 62 of magnet assembly 6 at magnetic conductive part 5 concentrates, the stage casing 72 of joint cover 7 can slacken with the magnetic field at the electric arc place that hypomere 73 produces greatly, has reduced the resistance that electric arc gets into arc extinguishing grid pieces 13 like this; Be Lorentz force F1, make arc energy get into arc extinguishing grid pieces 13 smoothly.Simultaneously, fixed contact 3 makes two to increase between the magnet assembly 6 and to form magnetic line of force B, makes fixed contact 3 receive the effect of a downward Lorentz force F3, can accelerate the speed of scolding out of fixed contact 3, elongates electric arc rapidly, increases arc voltage, the growth of limiting short-circuit current.The side 61 that increases magnet assembly 6 is in the outside of arc control device 12, the reliable like this insulation that has guaranteed to increase magnet assembly 6 and arc extinguishing grid pieces 13.As be installed in inside, and increase magnet assembly 6 and can make arc extinguishing grid pieces 13 short circuits, even the arcing phenomenon takes place, seriously reduced the arc quenching effect that increases magnet assembly 6 and arc extinguishing grid pieces 13.Simultaneously; This magnetic line of force B vertical electrical arc current I; Like this under the effect of the Lorentz force F2 that produces at the electric arc place of magnetic line of force B, and magnetic conductive part 5 and the bottom surface 62 that increases magnet assembly 6 can reduce 73 sections Lorentz force F1 that produce at the electric arc place in stage casing 72 and hypomere of joint cover 7, quickened electric arc and moved to arc extinguishing grid pieces 13 directions; Fixed contact 3 moves downward and can move closer to magnetic conductive part 5; Because arc blow-out magnetic field is strengthened, the arc root on the fixed contact 3 can be very fast transfer on the magnetic conductive part 5, electric arc is moved in the arc extinguishing grid pieces 13 on the epimere 51 of magnetic conductive part 5 to be cut apart fast, is cooled off and extinguished.
Claims (2)
1. the arc blow-out device of a low-voltage circuit breaker; Comprise arc control device (12); Arc control device (12) bottom is support (4), in arc control device (12) inner chamber arc extinguishing grid pieces (13) is set, and the back-end contacts end of moving contact (1) stretches in arc control device (12) inner chamber; The front end link of fixed contact (3) connects support (4) pivotly; The back-end contacts end of fixed contact (3) stretches in arc control device (12) inner chamber and is positioned at the bottom of arc extinguishing grid pieces (13), it is characterized in that: support (4) rear portion each side have one first groove (43), first groove (43) is provided with and increases magnet assembly (6); Increasing magnet assembly (6) is made up of bottom surface and side; The bottom surface (62) that increases magnet assembly is fixedly installed in first groove (43), and the side (61) that increases magnet assembly extends upward in the outside of arc control device (12), and the tip side of dynamic/static contact is positioned between two said sides (61) that increase magnet assembly or the deflection front end; Support (4) rear portion is provided with a joint cover (7); The Z font structure that joint cover (7) is made up of three sections of upper, middle and lower; Between the stage casing (72) of fixed contact (3) and joint cover and the below that is positioned at arc extinguishing grid pieces (13) magnetic conductive part (5) is set; The hypomere (73) of the affixed joint cover of the hypomere of magnetic conductive part (52), the epimere of magnetic conductive part (51) stretch in the arc control device (12) and are parallel to arc extinguishing grid pieces (13) with a gap and tilt towards the tip side of fixed contact (3).
2. the arc blow-out device of low-voltage circuit breaker according to claim 1; It is characterized in that: support (4) middle part each side have one second groove (45); Second groove (45) locates to be provided with symmetrically two holes (41); Fixed contact (3) and two holes (41) are passed in first (9), respectively are with a torsion spring (8) at the two ends of first (9), and the elastic force direction of torsion spring (8) is fixed contact (3) dorsad.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103541814A CN102427009A (en) | 2011-11-10 | 2011-11-10 | Arc blowing device for low-voltage circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103541814A CN102427009A (en) | 2011-11-10 | 2011-11-10 | Arc blowing device for low-voltage circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102427009A true CN102427009A (en) | 2012-04-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103541814A Pending CN102427009A (en) | 2011-11-10 | 2011-11-10 | Arc blowing device for low-voltage circuit breaker |
Country Status (1)
| Country | Link |
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| CN (1) | CN102427009A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102938354A (en) * | 2012-11-15 | 2013-02-20 | 西安交通大学 | Contact and arc extinction system of mold case circuit breaker |
| CN107424861A (en) * | 2017-08-03 | 2017-12-01 | 上海良信电器股份有限公司 | A kind of rotary separation switch contact module with increasing magnetic patch |
| CN108389742A (en) * | 2018-04-27 | 2018-08-10 | 福州大学 | Reinforce the method that arc gap arc blow-out magnetic flux improves electric appliance arc extinguishing ability |
| CN109509691A (en) * | 2019-01-09 | 2019-03-22 | 常熟开关制造有限公司(原常熟开关厂） | A kind of contact arc extinguishing device and its breaker of breaker |
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| US5164560A (en) * | 1990-11-22 | 1992-11-17 | Fuji Electric Co., Ltd. | Repulsion type circuit breaker control device |
| CN1121634A (en) * | 1994-06-14 | 1996-05-01 | 富士电机株式会社 | Circuit breaker |
| CN2762330Y (en) * | 2004-07-23 | 2006-03-01 | 浙江正泰电器股份有限公司 | Arc-chutes of low-voltage circuit breaker |
| CN101236865A (en) * | 2008-02-26 | 2008-08-06 | 常熟开关制造有限公司(原常熟开关厂） | Contactor system for low-voltage breaker |
| CN101986415A (en) * | 2010-11-11 | 2011-03-16 | 江苏辉能电气有限公司 | Arc extinguishing chamber of molded case low voltage circuit breaker |
| CN102184812A (en) * | 2011-05-03 | 2011-09-14 | 江苏辉能电气有限公司 | Movable static contact structure for plastic-shell circuit breaker |
-
2011
- 2011-11-10 CN CN2011103541814A patent/CN102427009A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5164560A (en) * | 1990-11-22 | 1992-11-17 | Fuji Electric Co., Ltd. | Repulsion type circuit breaker control device |
| CN1121634A (en) * | 1994-06-14 | 1996-05-01 | 富士电机株式会社 | Circuit breaker |
| CN2762330Y (en) * | 2004-07-23 | 2006-03-01 | 浙江正泰电器股份有限公司 | Arc-chutes of low-voltage circuit breaker |
| CN101236865A (en) * | 2008-02-26 | 2008-08-06 | 常熟开关制造有限公司(原常熟开关厂） | Contactor system for low-voltage breaker |
| CN101986415A (en) * | 2010-11-11 | 2011-03-16 | 江苏辉能电气有限公司 | Arc extinguishing chamber of molded case low voltage circuit breaker |
| CN102184812A (en) * | 2011-05-03 | 2011-09-14 | 江苏辉能电气有限公司 | Movable static contact structure for plastic-shell circuit breaker |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102938354A (en) * | 2012-11-15 | 2013-02-20 | 西安交通大学 | Contact and arc extinction system of mold case circuit breaker |
| CN102938354B (en) * | 2012-11-15 | 2015-05-27 | 西安交通大学 | Contact and arc extinction system of mold case circuit breaker |
| CN107424861A (en) * | 2017-08-03 | 2017-12-01 | 上海良信电器股份有限公司 | A kind of rotary separation switch contact module with increasing magnetic patch |
| CN108389742A (en) * | 2018-04-27 | 2018-08-10 | 福州大学 | Reinforce the method that arc gap arc blow-out magnetic flux improves electric appliance arc extinguishing ability |
| CN109509691A (en) * | 2019-01-09 | 2019-03-22 | 常熟开关制造有限公司(原常熟开关厂） | A kind of contact arc extinguishing device and its breaker of breaker |
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Application publication date: 20120425 |