CN107342178A - A kind of high-breaking miniature breaker - Google Patents
A kind of high-breaking miniature breaker Download PDFInfo
- Publication number
- CN107342178A CN107342178A CN201710727738.1A CN201710727738A CN107342178A CN 107342178 A CN107342178 A CN 107342178A CN 201710727738 A CN201710727738 A CN 201710727738A CN 107342178 A CN107342178 A CN 107342178A
- Authority
- CN
- China
- Prior art keywords
- moving contact
- arc
- contact
- actively fork
- insulation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
- H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/18—Means for extinguishing or suppressing arc
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
A kind of high-breaking miniature breaker, composition includes static contact, the moving contact being connected with tripping mechanism and insulation arc-extinguishing mechanism, the insulation arc-extinguishing mechanism includes insulation shielding plate, armature, U-shaped yoke, actively fork and driven lever, and the gap that the insulation shielding plate is located at below the moving contact of breaker and between dynamic and static contact is corresponding；The actively fork and driven lever are parallel to each other and form four-bar linkage structure with moving contact and insulation shielding plate；The armature is located above moving contact and is fixed on the turning handle of actively fork upper end；The U-shaped yoke is enclosed on moving contact and corresponding with armature from below；Torsion spring is provided between actively fork and moving contact.The insulation shielding plate of the present invention can be rapidly inserted between dynamic and static contact in breaker disjunction short circuit current, make arc extinction, the amplification time of arc energy is thus shortened, the short arcing of breaker is realized or without arcing, so as to substantially increase the ability of breaker disjunction short circuit current.
Description
Technical field
The present invention relates to a kind of miniature circuit breaker with strong short circuit current breaking capacity, belong to emergency protective device technology
Field.
Background technology
Miniature circuit breaker (MCB) is the industrial important electric elements with civilian low-voltage distribution apparatus, more applied to low pressure
The end of distribution system, the overload and short trouble of distribution line are protected.Wherein short trouble protection is that its is most important
Function, the short circuit current of circuit is very big during due to short trouble, breaker in disjunction short circuit current its dynamic and static contact it
Between can produce the very big plasma arc of energy, could only be broken by default arc-extinguishing unit rapidly by arc extinction
Road device could complete the task of disjunction short circuit current.
At present, caused HTHP electric arc enters when domestic and international MCB uses arc-chutes technology to disjunction short circuit current
Row cooling and extinguishing, the arc quenching principle of this technology are：During disjunction short circuit current, treat to produce electric arc between dynamic and static contact and draw
After growing to the corresponding amplification of certain length, energy, arc-chutes are entered using magnetic field electro-dynamic force or other means driving high energy arc, made
Extinguish under the cooling effect of its metal grid in arc-chutes.The arc quenching effect of this method by such as arc-chutes material, touch
Head cut-offs the influence of the factors such as speed, clearance between open contacts, contact material, especially for the breaker of single-break structure, its disjunction
The ability of short circuit current is poor, be usually no more than exchange 230V, 6kA, and direct-current short circuit electric current due to no zero passage process more
It is not easy disjunction.
With the raising that the construction and development and people of power network are required electric network reliability, a kind of new go out objectively is needed
Arc scheme, to greatly improve the ability of MCB disjunction short circuit currents.
The content of the invention
It is an object of the invention to the drawback for prior art, there is provided a kind of high-breaking miniature breaker, it is short to improve
The breaking capacity of road electric current.
Problem of the present invention is realized with following technical proposals：
A kind of high-breaking miniature breaker, composition include housing, static contact, moving contact, tripping mechanism and arc-chutes, changed
After entering, set up insulation arc-extinguishing mechanism, the insulation arc-extinguishing mechanism include insulation shielding plate, armature, U-shaped yoke, actively fork and
Driven lever, the gap that the insulation shielding plate is located at below the moving contact of breaker and between dynamic and static contact are corresponding；Institute
State actively fork and driven lever is parallel to each other and forms four-bar linkage structure with moving contact and insulation shielding plate；The armature is located at
Above moving contact and it is fixed on the turning handle of actively fork upper end；The U-shaped yoke is enclosed on from below on moving contact and and armature
It is corresponding；Torsion spring is provided between actively fork and moving contact.
Above-mentioned high-breaking miniature breaker, the both sides of the insulation shielding plate are folded upward at, and bending part touches away from dynamic
Head is rotatablely connected with one end of static contact contact surface and actively fork, one end of close moving contact and static contact contact surface with it is driven
Swing rod is rotatablely connected, and the turning handle of actively fork upper end is located remotely from the side of driven lever.
Above-mentioned high-breaking miniature breaker, the actively fork and driven lever are respectively provided with two, and they are symmetrically mounted on
The both sides of insulation shielding plate and moving contact, the turning handle of the both ends of armature respectively with two actively fork upper ends are connected.
Above-mentioned high-breaking miniature breaker, the actively fork and turning handle use integral structure.
Above-mentioned high-breaking miniature breaker, arc-chutes are additionally provided with the Shell of circuit breaker.
The present invention is additionally arranged insulation shielding plate can be in breaker disjunction short circuit as auxiliary extinction of arc mechanism, auxiliary extinction of arc mechanism
The moment of electric current acts rapidly, inserted between moving contact and static contact, make between dynamic and static contact just caused arc extinction or
Person is reduced, and is thus shortened the amplification time of arc energy, is reduced gathering for arc energy, is realized the short of breaker and is flown
Arc or without arcing.This invention takes two-stage arc extinguishing, after the electric arc after initial auxiliary extinction of arc can be introduced into arc-chutes continuation
Continuous arc extinguishing operation, so as to substantially increase the arc extinguishing ability of breaker, also substantially increases breaker disjunction short circuit current
Ability.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the structural representation of insulation arc-extinguishing mechanism；
Fig. 3 is Fig. 2 A direction views；
Fig. 4 is that contact reprimand is opened and masked state；
Fig. 5 is circuit breaker tripping open mode；
Fig. 6 is the structural representation of tripping mechanism；
Fig. 7 is moving contact structure schematic diagram；
Fig. 8 Fig. 7 top view；
Fig. 9 is the connection diagram of armature and actively fork；
Figure 10 is Fig. 9 left view；
The structural representation of Figure 11 insulation shielding plates；
Figure 12 is Figure 11 left view；
Figure 13 is the structural representation of U-shaped yoke；
Figure 14 is Figure 13 left view.
Each list of reference numerals is in figure：1st, static contact；2nd, moving contact；3rd, driven lever；4th, insulation shielding plate；5th, torsion spring；6、
Armature；7th, U-shaped yoke；8th, torque spring；9th, tripping mechanism；9-1, lock；9-2, moving contact rocking arm；9-3, tripping；9-4, company
Bar；9-5, extension spring；10th, magnetic dropout push rod；11st, upper jointed shaft；12nd, lower jointed shaft；13rd, actively fork；14th, turning handle；15th, arc extinguishing
Room；16th, handle；A, moving contact rotating shaft；B, bearing pin is latched；C, tripping bearing pin.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.
The present invention is mounted with an insulation arc-extinguishing mechanism driven by electromagnetic force on moving contact of breaker, in short trouble
The moment of appearance, the not yet full opening of electric arc lag phase (energy not yet amplifies) of its dynamic and static contact, dynamic and static contact are electric
While dynamic repulsion reprimand is opened, the mechanism is rapidly inserted into dynamic and static between lifting one's head.Electric arc is extinguished using insulation shielding mode, so as to big
Width improves the ability of MCB disjunction short circuit currents.
Referring to Fig. 1-Fig. 6, the invention mainly comprises the static contact 1 in case for circuit breaker, moving contact 2, dropout machine
Structure 9, magnetic dropout push rod 10, arc-chutes 15 and insulation arc-extinguishing mechanism, wherein, turning joint is used between static contact 1 and moving contact 2
Formula repulsion structure, moving contact 2 are arranged on by moving contact rotating shaft A on the moving contact rocking arm 9-2 of tripping mechanism 9, magnetic dropout push rod
10 are arranged on the lower section of tripping mechanism 9 and corresponding with the lock 9-1 of tripping mechanism 9；It is additionally provided with tripping mechanism 9 for inciting somebody to action
Moving contact 2 is pressed on the torque spring 8 on static contact 1.The arc-extinguishing mechanism that insulate includes driven lever 3, actively fork 13, insulation screen
Shield plate 4, torsion spring 5, armature 6 and U-shaped yoke 7.Wherein, insulation shielding plate 4, actively fork 13, driven lever 3 are dynamic with breaker
Contact 2 form a quadric chain, driven lever 3 by upper jointed shaft 11 and lower jointed shaft 12 be articulated with moving contact 2 with absolutely
Between edge barricade 4, actively fork 13 is equally also articulated between moving contact 2 and insulation arc extinction part 4, and armature 6 passes through turning handle 14
It is connected with the upper end of actively fork 13, U-shaped yoke 7 is on moving contact 2 and corresponding with armature 6, and torsion spring 5 is arranged on dynamic touch
Between first 2 and actively fork 13 (or turning handle 14), usually due to effect of the torsion spring 5 to actively fork 13 (or turning handle 14), insulation
Arc-extinguishing mechanism is in open mode (position in Fig. 2).When short circuit current occurs in circuit, due to static contact 1 and the electricity of moving contact 2
Stream is in opposite direction, therefore produces electrodynamic repulsion force and open static contact 1 and the reprimand of moving contact 2, simultaneously because U-shaped yoke 7 is short-circuited electric current
Electromagnetic attraction is produced after magnetization to armature 6, armature 6, actively fork 13 and turning handle 14 overcome the elastic force of torsion spring 5 to produce clockwise turn
Dynamic, so as to drive the insulation arc-control device of four-bar linkage structure to act, its insulation shielding plate 4 is fast while dynamic and static contact reprimand is opened
Between speed insertion moving contact 2 and static contact 1, reach the purpose of rapid insulation shielding arc extinguishing.At the same time, MCB magnetic is threaded off and pushed away
Bar 10 promotes its tripping mechanism 9 (ripe design) to be rotated clockwise around lock bearing pin B and realizes disconnection of threading off, and handle 16 is positioned at switch
Open position, complete MCB breaking course.Arc-chutes 15 design to be former, do not influence the arc-extinguishing mechanism that insulate.Short circuit current disappears
Afterwards, insulate arc-control device homing.
Insulation shielding plate 4 is using high intensity, resistant to elevated temperatures engineering plastic materials.It can ensure effectively to divide as defined in product standard
The number (most 3 times) of disconnected short circuit current.
Insulation shielding plate 4 forms two-stage arc-control device as auxiliary extinction of arc mechanism and arc-chutes 15, and auxiliary extinction of arc mechanism exists
Arc extinguishing when dynamic and static contact is not yet opened completely, and arc-chutes 15 are then to have good extinguishing residual after dynamic and static contact is opened completely
Remaining arcing.
Tripping mechanism 9 includes lock 9-1, moving contact rocking arm 9-2, tripping 9-3, connecting rod 9-4 and extension spring 9-5, lock 9-1 and
Moving contact rocking arm 9-2 is arranged on the support of Shell of circuit breaker by latching bearing pin B, and magnetic dropout push rod 10 is arranged on lock 9-
On the Shell of circuit breaker of 1 lower section；Tripping 9-3 is hinged on moving contact rocking arm 9-2 close to one end of handle by tripping bearing pin C, jumps
It is flexibly connected between button 9-3 and handle 16 by connecting rod 9-4；The moving contact rocking arm 9-2 other end is hinged by moving contact rotating shaft A
The tail end of moving contact 2；Extension spring 9-5 one end is connected on moving contact rocking arm 9-2 between lock bearing pin B and tripping bearing pin C
Position, the other end is fixed in the support shaft of Shell of circuit breaker distal end.
Torque spring 8 is additionally provided with tripping mechanism 9；Torque spring is installed on moving contact 2 by moving contact rotating shaft A and moved
On contact rocking arm 9-2, under "on" position, torque spring 8 can make the head of moving contact 2 be in close contact and keep with static contact 1
Certain pressure.
The bonding jumper of static contact 1 comprises at least one section of flat segments parallel with moving contact 2, the electric current in flat segments with it is dynamic
The sense of current in contact 2 is on the contrary, the length of flat segments produces when being more than or equal to short circuit current flow in moving contact and static contact
Make the length required for the repulsion that dynamic and static contact repels each other out.
The operation principle of tripping mechanism 9 is as follows：
Before short-circuit current occurs in distribution system and short circuit current not yet reaches peak value, due to moving contact 2 and quiet
The sense of current in the flat segments of contact 1 is opposite so that electrodynamic repulsion force is produced between moving contact and static contact, moving contact 2 is electronic
Power effect under overcome torque spring 8 twisting force be first about moving contact rotating shaft A rotate clockwise with static contact 1 reprimand open, together
When insulate arc-extinguishing mechanism action, realize and effective limitation of the initial stage to short circuit current occur in short trouble；Then, magnetic standby is protected
Protect the magnetic dropout push rod 10 in trip coil and drive the lock 9-1 in tripping mechanism 9 rapidly under the influence of a magnetic field around lock
Pin buckle axle B is rotated clockwise, and the lap-joint for now latching 9-1 and tripping 9-3 in D points (referring to Fig. 6) disengages, and tripping 9-3 loses
After support around tripping bearing pin C rotationally clockwise, moving contact rocking arm 9-2 loses connecting rod 9-4 support simultaneously, in extension spring 9-5
In the presence of rotated clockwise around lock bearing pin B, 9 overall clockwise motion of tripping mechanism, switch off.I.e. in short circuit current
Before reaching maximum, denounceed out in advance by the repulsion between moving contact and static contact, short circuit breaking capacity is improved to reach
Purpose.
Because MCB uses above technical scheme, following technological progress can be obtained：
1 can greatly improve the ability of product disjunction short circuit current；
2. the general purpose of AC and DC can be reached；
3. in disjunction failed shorted electric current, the further expansion of arc energy can be limited, so as to which the short of product can be realized
Arcing or without arcing.
Claims (5)
1. a kind of high-breaking miniature breaker, composition includes housing, static contact, moving contact, tripping mechanism and arc-chutes, and it is special
Sign is to set up insulation arc-extinguishing mechanism, and the insulation arc-extinguishing mechanism includes insulation shielding plate (4), armature (6), U-shaped yoke (7), master
Driven fork (13) and driven lever (3), the insulation shielding plate (4) are located at below the moving contact (2) of breaker and touched with dynamic and static
Gap between head is corresponding；The actively fork (13) and driven lever (3) are parallel to each other and shielded with moving contact (2) and insulation
Shield plate (4) forms four-bar linkage structure；The armature (6) is located above moving contact (2) and is fixed on actively fork (13) upper end
On turning handle (14)；The U-shaped yoke (7) is enclosed on moving contact (2) and corresponding with armature (6) from below；In actively fork
(13) torsion spring (5) is provided between moving contact (2).
2. high-breaking miniature breaker according to claim 1, it is characterized in that, the two of the insulation shielding plate (4) are lateral
Upper bending, the remote moving contact (2) of bending part are rotatablely connected with one end of static contact (1) contact surface and actively fork (13),
It is rotatablely connected close to one end of moving contact (2) and static contact (1) contact surface with driven lever (3), actively fork (13) upper end
Turning handle (14) is located remotely from the side of driven lever (3).
3. high-breaking miniature breaker according to claim 1 or 2, it is characterized in that, the actively fork (13) and driven
Swing rod (3) is respectively provided with two, and they are symmetrically mounted on the both sides of insulation shielding plate (4) and moving contact (2), the both ends of armature (6)
The turning handle (14) with two actively fork (13) upper ends is connected respectively.
4. high-breaking miniature breaker according to claim 3, it is characterized in that, the actively fork (13) and turning handle (14)
Using integral structure.
5. high-breaking miniature breaker according to claim 4, it is characterized in that, it is additionally provided with arc extinguishing in the Shell of circuit breaker
Room (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710727738.1A CN107342178B (en) | 2017-08-23 | 2017-08-23 | High-breaking miniature circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710727738.1A CN107342178B (en) | 2017-08-23 | 2017-08-23 | High-breaking miniature circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107342178A true CN107342178A (en) | 2017-11-10 |
| CN107342178B CN107342178B (en) | 2020-07-24 |
Family
ID=60214279
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710727738.1A Active CN107342178B (en) | 2017-08-23 | 2017-08-23 | High-breaking miniature circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107342178B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109087832A (en) * | 2018-10-08 | 2018-12-25 | 嘉兴市加控电气设备制造有限公司 | Miniature circuit breaker |
| CN109494132A (en) * | 2018-12-31 | 2019-03-19 | 盛道（中国）电气有限公司 | A kind of double-contact breaker of plastic casing |
| CN110581045A (en) * | 2019-09-12 | 2019-12-17 | 南京日新科技有限公司 | Isolated contact mechanism for circuit breaker |
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| CN103646804A (en) * | 2013-11-30 | 2014-03-19 | 德力西电气有限公司 | Forced arc extinguishing device of circuit breaker |
| CN204270934U (en) * | 2014-12-05 | 2015-04-15 | 平顶山天晟电气有限公司 | A kind of low-voltage circuit breaker with arc extinguishing slide block |
| CN207367828U (en) * | 2017-08-23 | 2018-05-15 | 河北宝凯电气股份有限公司 | A kind of high-breaking miniature breaker |
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2017
- 2017-08-23 CN CN201710727738.1A patent/CN107342178B/en active Active
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| CN1457065A (en) * | 2003-03-12 | 2003-11-19 | 北京人民电器厂 | Circuit breaker forced extinguisher |
| JP2005129436A (en) * | 2003-10-27 | 2005-05-19 | Matsushita Electric Works Ltd | Circuit breaker |
| JP2012212543A (en) * | 2011-03-31 | 2012-11-01 | Nihon Kaiheiki Industry Co Ltd | Miniature switch for dc cutoff with arc-extinguishing device |
| CN102427006A (en) * | 2011-11-08 | 2012-04-25 | 江苏辉能电气有限公司 | Contact structure for low-current molded case low-voltage circuit breaker |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109087832A (en) * | 2018-10-08 | 2018-12-25 | 嘉兴市加控电气设备制造有限公司 | Miniature circuit breaker |
| CN109087832B (en) * | 2018-10-08 | 2023-11-14 | 嘉兴市加控电气设备制造有限公司 | Small-sized circuit breaker |
| CN109494132A (en) * | 2018-12-31 | 2019-03-19 | 盛道（中国）电气有限公司 | A kind of double-contact breaker of plastic casing |
| CN109494132B (en) * | 2018-12-31 | 2024-04-02 | 盛道（中国）电气有限公司 | Double-contact molded case circuit breaker |
| CN110581045A (en) * | 2019-09-12 | 2019-12-17 | 南京日新科技有限公司 | Isolated contact mechanism for circuit breaker |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107342178B (en) | 2020-07-24 |
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