CN207303016U - A kind of miniature circuit breaker of strong breaking capacity - Google Patents
A kind of miniature circuit breaker of strong breaking capacity Download PDFInfo
- Publication number
- CN207303016U CN207303016U CN201721057155.4U CN201721057155U CN207303016U CN 207303016 U CN207303016 U CN 207303016U CN 201721057155 U CN201721057155 U CN 201721057155U CN 207303016 U CN207303016 U CN 207303016U
- Authority
- CN
- China
- Prior art keywords
- static contact
- arc
- flashboard
- circuit breaker
- rocking arm
- 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.)
- Expired - Fee Related
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- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
A kind of miniature circuit breaker of strong breaking capacity, composition includes housing, static contact, moving contact, tripping mechanism and arc-chutes, after improvement, adds insulation arc-extinguishing mechanism, the insulation arc-extinguishing mechanism includes shielding flashboard, yoke, rocking arm and torsional spring, the yoke and is fixed on static contact；The shutter plate level is placed and gap between dynamic and static contact is corresponding, and two sides for shielding flashboard are slidably connected by horizontal slide rail and Shell of circuit breaker；One end of remote static contact of the upper end of the rocking arm with shielding flashboard is hinged, and lower end is equipped with armature by the fixed pin shaft and the housing hinge of breaker through torsional spring at the middle part of rocking arm；The both ends of the torsional spring are pressed respectively against on rocking arm and Shell of circuit breaker.The shielding flashboard of the utility model can be rapidly inserted between moving contact and static contact in breaker disjunction short circuit current flow, made arc extinction, thus shortened the amplification time of arc energy, so as to substantially increase the ability of breaker disjunction short circuit current flow.
Description
Technical field
A kind of miniature circuit breaker with strong short circuit current flow breaking capacity is the utility model is related to, belongs to switching technique neck
Domain.
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, protects the overload and short trouble of distribution line.Wherein short trouble protection is that its is most important
Function, the short circuit current flow of circuit is very big during due to short trouble, breaker in disjunction short circuit current flow 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 flow.
At present, domestic and international MCB using arc-chutes technology to disjunction short circuit current flow when caused high temperature and pressure electric arc into
Row cooling and extinguishing, the arc quenching principle of this technology are：During disjunction short circuit current flow, 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, are made
Extinguish under the cooling effect of its metal grid in arc-chutes.The arc quenching effect of this method is subject to such as arc-chutes material, touches
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 flow 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 grid require electric network reliability, a kind of new go out objectively is needed
Arc scheme, to greatly improve the ability of MCB disjunction short circuit current flows.
Utility model content
A kind of the purpose of this utility model is that drawback for the prior art, there is provided the small-sized open circuit of strong breaking capacity
Device, to improve the breaking capacity of short circuit current flow.
Problem described in the utility model is solved with following technical proposals：
A kind of miniature circuit breaker of strong breaking capacity, composition include housing, static contact, moving contact, tripping mechanism and go out
Arc chamber, after improvement, adds insulation arc-extinguishing mechanism, the insulation arc-extinguishing mechanism includes shielding flashboard, yoke, rocking arm and torsional spring, institute
Yoke is stated to be fixed on static contact；The shutter plate level is placed and gap between dynamic and static contact is corresponding, shutter
Two sides of plate are slidably connected by horizontal slide rail and Shell of circuit breaker；The upper end of the rocking arm is remote quiet with shielding flashboard
One end of contact is hinged, and lower end is by the fixed pin shaft and the housing hinge of breaker through torsional spring centre bore, in rocking arm
Portion is equipped with and the corresponding armature of yoke；The both ends of the torsional spring are pressed respectively against on rocking arm and Shell of circuit breaker.
The miniature circuit breaker of above-mentioned strong breaking capacity, one end of the remote static contact of the shielding flashboard are fixed with flashboard pin
Axis, the middle part of the flashboard axis pin are located in the slotted hole of rocking arm upper end.
The miniature circuit breaker of above-mentioned strong breaking capacity, with shielding two corresponding horizontal slide rails in side of flashboard as fixation
Slot rails on Shell of circuit breaker two side.
The miniature circuit breaker of above-mentioned strong breaking capacity, the Shell of circuit breaker is interior to be equipped with magnetic protection buckle releaser, and the magnetic is protected
The buckle releaser push rod for protecting buckle releaser is corresponding with the lock of tripping mechanism.
The present invention is additionally arranged auxiliary extinction of arc mechanism, auxiliary extinction of arc mechanism can breaker disjunction short circuit current flow moment it is rapid
Between action, insertion moving contact and static contact, make arc extinction or the reduction just produced between dynamic and static contact, thus
The amplification time of arc energy is shortened, reduces gathering for arc energy, realizes the short arcing of breaker or without arcing.This
Utility model takes two-stage arc extinguishing, and the electric arc after initial auxiliary extinction of arc can be introduced into arc-chutes and continue follow-up arc extinguishing behaviour
Make, so as to substantially increase the arc extinguishing ability of breaker, also substantially increase the ability of breaker disjunction short circuit current flow.
Brief description of the drawings
Fig. 1 is the structure diagram of the utility model；
Fig. 2 is the "on" position of the utility model；
Fig. 3 is that contact reprimand is opened and masked state；
Fig. 4 is the failure gate-dividing state of the utility model；
Fig. 5 is the structure diagram for shielding flashboard；
Fig. 6 is the top view of Fig. 5；
Fig. 7 is the structure diagram of rocking arm；
Fig. 8 is the left view of Fig. 7.
Each list of reference numerals is in figure：1st, static contact；2nd, moving contact；3rd, housing；4th, flashboard, 4-1 flashboard axis pins are shielded；5th, shake
Arm；5-1, armature；6th, yoke；7th, torsional spring；8th, handle；9th, tripping mechanism；10th, magnetic protection buckle releaser, 10-1, buckle releaser push rod；
11st, torque spring；12nd, slide；A, moving contact shaft；B, axis pin is latched；C, fixed pin shaft.
Embodiment
The utility model is described in further detail below in conjunction with the accompanying drawings.
The utility model is mounted with an insulation arc-extinguishing mechanism driven by electromagnetic force in the inside of breaker, in short-circuit event
Hinder the moment occurred, the not yet full opening of electric arc lag phase (energy not yet amplifies) of the dynamic and static contact of breaker, it is dynamic and static to touch
While head is opened by electrodynamic repulsion force reprimand, electromagnetic force forces the shielding flashboard in the slot rails on the inside of MCB shells rapid
It is inserted between dynamic and static contact.Electric arc is extinguished using insulation shielding mode, so that the energy of MCB disjunction short circuit current flows greatly improved
Power.The ability of disjunction short circuit current flow greatly improved in the utility model, you can disjunction alternating short-circuit current, also can disjunction direct current it is short
Road electric current.
Referring to Fig. 1~Fig. 8, the utility model includes the static contact 1, moving contact 2, shielding being arranged in Shell of circuit breaker 3
Flashboard 4, flashboard axis pin 4-1, Rocker arm 5, armature 5-1, yoke 6, torsional spring 7, handle 8, tripping mechanism 9, magnetic are protected buckle releaser 10, are taken off
Detain device push rod 10-1, moving contact shaft A, lock axis pin B, fixed pin shaft C and torque spring 11.
Rocker arm 5 is that an assembly, Rocker arm 5 and torsional spring 7 are installed on Shell of circuit breaker by fixed pin shaft C with armature 5-1,
Rocker arm 5 can swing, and usually Rocker arm 5 and armature 5-1 act on the position being in Fig. 1 due to torsional spring 7, and insulate arc extinguishing machine
Structure is in an open state.When short-circuit current occurs in circuit, due to static contact 1 with 2 current direction of moving contact on the contrary, therefore producing
Raw electrodynamic repulsion force by static contact 1, quickly open with moving contact 2 by reprimand, simultaneously because yoke 6 is right under the magnetic fields that high current produces
Armature 5-1 produces electromagnetic attraction, and armature 5-1 overcomes 7 zone of action of torsional spring to move Rocker arm 5 generation quick rotation counterclockwise, so as to drive
Flashboard 4 is shielded in slot rails in body shell 3 quickly to left movement, and be rapidly inserted into while dynamic and static contact reprimand is opened it is dynamic,
Between static contact, play the role of fast arc extinction, at the same time, the magnetic protection buckle releaser 10 of MCB acts, its buckle releaser push rod
10-1 promotes tripping mechanism 9 (maturation design) action, completes the short circuit breaking process of MCB.Since short circuit current flow is cut off, forceful electric power
Magnetic field disappears, and shields 4 homing of flashboard.
Rotating hinge chain type repulsion structure is used between static contact 1 and moving contact 2.The metal strip of static contact 1 includes at least one
Section flat segments parallel with moving contact, the current direction in 1 flat segments of static contact and moving contact 2 is on the contrary, 1 flat segments of static contact
Length produce when being more than or equal to short circuit current flow in moving contact and static contact and make the repulsion that dynamic and static contact repels each other out required for
Length.When an error occurs, when the opposite short circuit current flow in direction flows through static contact flat segments and moving contact, in 1 He of static contact
Electrodynamic repulsion force is produced between moving contact 2 so that moving contact 2 is denounceed out rotationally clockwise using moving contact shaft A as axis.This practicality
The relatively common static contact of geometrical length of new 1 flat segments of middle static contact is lengthened so that moving contact 2 and static contact 1 are flat
Row distance increases, and under the opposite short circuit current flow effect in direction, can produce larger electrodynamic repulsion force.
The insulation arc-extinguishing mechanism of the utility model forms two-stage arc-control device, auxiliary as auxiliary extinction of arc mechanism and arc-chutes
Arc-extinguishing mechanism arc extinguishing when dynamic and static contact is not yet opened completely, and arc-chutes are then with good after dynamic and static contact is opened completely
Good extinguishing remnants arcings.
Flashboard 4 is shielded using high intensity, heat safe engineering plastic materials.It can ensure effective disjunction as defined in product standard
The number (most 3 times) of short circuit current flow.
Since MCB uses above technical scheme, following technological progress can be obtained：
1 can greatly improve the ability of product disjunction short circuit current flow；
2. it can achieve the purpose that AC and DC is general；
3. in disjunction failed shorted electric current, the further expansion of arc energy can be limited, so that the short of product can be realized
Arcing or without arcing.
Claims (4)
1. a kind of miniature circuit breaker of strong breaking capacity, composition include housing, static contact, moving contact, tripping mechanism and arc extinguishing
Room, it is characterized in that, insulation arc-extinguishing mechanism is added, the insulation arc-extinguishing mechanism includes shielding flashboard (4), yoke (6), rocking arm (5)
With torsional spring (7), the yoke (6) is fixed on static contact (1)；It is described shielding flashboard (4) it is horizontal positioned and with dynamic and static contact it
Between gap it is corresponding, shielding flashboard (4) two sides be slidably connected by horizontal slide rail (12) and housing (3)；It is described to shake
The upper end of arm (5) and one end of the remote static contact (1) of shielding flashboard (4) are hinged, and lower end passes through through torsional spring (7) centre bore
Fixed pin shaft (C) is hinged with housing (3), is equipped with and yoke (6) corresponding armature (5-1) at the middle part of rocking arm (5)；The torsion
The both ends of spring (7) are pressed respectively against on rocking arm (5) and housing (3).
2. the miniature circuit breaker of strong breaking capacity according to claim 1, it is characterized in that, it is described to shield the remote of flashboard (4)
One end from static contact (1) is fixed with flashboard axis pin (4-1), and the middle part of the flashboard axis pin (4-1) is located at rocking arm (5) upper end
In slotted hole.
3. the miniature circuit breaker of strong breaking capacity according to claim 1 or 2, it is characterized in that, two with shielding flashboard (4)
The corresponding horizontal slide rail in bar side (12) is the slot rails being fixed on housing (3) two side.
4. the miniature circuit breaker of strong breaking capacity according to claim 3, it is characterized in that, it is equipped with magnetic in the housing (3)
Buckle releaser (10) is protected, the buckle releaser push rod (10-1) of the magnetic protection buckle releaser (10) is opposite with the lock of tripping mechanism (9)
Should.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721057155.4U CN207303016U (en) | 2017-08-23 | 2017-08-23 | A kind of miniature circuit breaker of strong breaking capacity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721057155.4U CN207303016U (en) | 2017-08-23 | 2017-08-23 | A kind of miniature circuit breaker of strong breaking capacity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207303016U true CN207303016U (en) | 2018-05-01 |
Family
ID=62443412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721057155.4U Expired - Fee Related CN207303016U (en) | 2017-08-23 | 2017-08-23 | A kind of miniature circuit breaker of strong breaking capacity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207303016U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108695124A (en) * | 2018-06-15 | 2018-10-23 | 上海电器科学研究所（集团）有限公司 | A kind of breaker layout structure of optimization |
| CN109801818A (en) * | 2019-03-22 | 2019-05-24 | 乐清市速通电气有限公司 | Contact system with arc |
-
2017
- 2017-08-23 CN CN201721057155.4U patent/CN207303016U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108695124A (en) * | 2018-06-15 | 2018-10-23 | 上海电器科学研究所（集团）有限公司 | A kind of breaker layout structure of optimization |
| CN108695124B (en) * | 2018-06-15 | 2023-09-08 | 上海电器科学研究所（集团）有限公司 | Optimized breaker layout structure |
| CN109801818A (en) * | 2019-03-22 | 2019-05-24 | 乐清市速通电气有限公司 | Contact system with arc |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180501 Termination date: 20200823 |