CN107393780A - 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
- CN107393780A CN107393780A CN201710727757.4A CN201710727757A CN107393780A CN 107393780 A CN107393780 A CN 107393780A CN 201710727757 A CN201710727757 A CN 201710727757A CN 107393780 A CN107393780 A CN 107393780A
- Authority
- CN
- China
- Prior art keywords
- circuit breaker
- static contact
- arc
- flashboard
- 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.)
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Classifications
-
- 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 miniature circuit breaker of strong breaking capacity, composition includes housing, static contact, moving contact, tripping mechanism and arc-chutes, after improvement, sets up insulation arc-extinguishing mechanism, the insulation arc-extinguishing mechanism includes shielding flashboard, yoke, rocking arm and torsion 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 provided with armature by the fixed pin shaft and the housing hinge of breaker through torsion spring at the middle part of rocking arm；The both ends of the torsion spring are press respectively against on rocking arm and Shell of circuit breaker.The shielding flashboard of the present invention can be rapidly inserted between moving contact and static contact in breaker disjunction short circuit current, made arc extinction, thus shortened the amplification time of arc energy, 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 switching technique 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 miniature circuit breaker of strong breaking capacity, with
Improve the breaking capacity of short circuit current.
Problem of the present invention is that 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 gone out
Arc chamber, after improvement, insulation arc-extinguishing mechanism is set up, the insulation arc-extinguishing mechanism includes shielding flashboard, yoke, rocking arm and torsion 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 torsion spring centre bore, in rocking arm
Portion is provided with the armature corresponding with yoke；The both ends of the torsion spring are press 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
Axle, the middle part of the flashboard bearing pin are located in the slotted hole of rocking arm upper end.
The miniature circuit breaker of above-mentioned strong breaking capacity, the horizontal slide rail corresponding with two sides of shielding flashboard are 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 provided with magnetic protection electrical apparatus release, and the magnetic is protected
The electrical apparatus release push rod for protecting electrical apparatus release 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 moment it is rapid
Between action, insertion moving contact and static contact, make just caused arc extinction or reduction 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
Invention 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 operation,
So as to substantially increase the arc extinguishing ability of breaker, the ability of breaker disjunction short circuit current is also substantially increased.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the "on" position of the present invention；
Fig. 3 is that contact reprimand is opened and masked state；
Fig. 4 is the failure gate-dividing state of the present invention；
Fig. 5 is the structural representation for shielding flashboard；
Fig. 6 is Fig. 5 top view；
Fig. 7 is the structural representation of rocking arm；
Fig. 8 is Fig. 7 left view.
Each list of reference numerals is in figure：1st, static contact；2nd, moving contact；3rd, housing；4th, flashboard, 4-1 flashboard bearing pins are shielded；5th, shake
Arm；5-1, armature；6th, yoke；7th, torsion spring；8th, handle；9th, tripping mechanism；10th, magnetic protection electrical apparatus release, 10-1, electrical apparatus release push rod；
11st, torque spring；12nd, slide rail；A, moving contact rotating shaft；B, bearing pin is latched；C, fixed pin shaft.
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 in the inside of breaker, goes out in short trouble
Existing moment, the not yet full opening of electric arc lag phase (energy not yet amplifies) of the dynamic and static contact of breaker, dynamic and static contact quilt
While electrodynamic repulsion force reprimand is opened, electromagnetic force forces the shielding flashboard in the slot rails on the inside of MCB shells to be rapidly inserted into
Between dynamic and static contact.Electric arc is extinguished using insulation shielding mode, so as to which the ability of MCB disjunction short circuit currents greatly improved.This
The ability of disjunction short circuit current greatly improved in invention, you can disjunction alternating short-circuit current, also can disjunction direct-current short circuit electric current.
Referring to Fig. 1~Fig. 8, the present invention includes the static contact 1, moving contact 2, shielding flashboard being arranged in Shell of circuit breaker 3
4th, flashboard bearing pin 4-1, Rocker arm 5, armature 5-1, yoke 6, torsion spring 7, handle 8, tripping mechanism 9, magnetic protection electrical apparatus release 10, electrical apparatus release
Push rod 10-1, moving contact rotating shaft A, lock bearing pin B, fixed pin shaft C and torque spring 11.
Rocker arm 5 is that an assembly, Rocker arm 5 and torsion spring 7 are arranged on Shell of circuit breaker by fixed pin shaft C with armature 5-1,
Rocker arm 5 can swing, and the position that usually Rocker arm 5 and armature 5-1 are in Fig. 1 due to the effect of torsion spring 7, insulate arc extinguishing machine
Structure is open mode.When short-circuit current occurs in circuit, due to static contact 1 with the sense of current of moving contact 2 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 magnetic fields caused by high current
Armature 5-1 produces electromagnetic attraction, and armature 5-1 overcomes the zone of action motion rocker arm 5 of torsion spring 7 to produce 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 a part of fast arc extinction, at the same time, MCB magnetic protection electrical apparatus release 10 acts, its electrical apparatus release push rod
10-1 promotes tripping mechanism 9 to act, and completes MCB short circuit breaking process.Because short circuit current is cut off, strong-electromagnetic field disappears,
Shield the homing of flashboard 4.
Rotating hinge chain type repulsion structure is used between static contact 1 and moving contact 2.The bonding jumper of static contact 1 comprises at least one
Section flat segments parallel with moving contact, the sense of current in the flat segments of static contact 1 and moving contact 2 is on the contrary, the flat segments of static contact 1
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 short circuit current in opposite direction flows through static contact flat segments and moving contact, in the He of static contact 1
Electrodynamic repulsion force is produced between moving contact 2 so that moving contact 2 is denounceed out rotationally clockwise using moving contact rotating shaft A as axle.The present invention
The relatively common static contact of geometrical length of the middle flat segments of static contact 1 is lengthened so that moving contact 2 it is parallel with static contact 1 away from
From growth, under short circuit current effect in opposite direction, larger electrodynamic repulsion force can be produced.
The insulation arc-extinguishing mechanism of the present invention forms two-stage arc-control device, auxiliary extinction of arc as auxiliary extinction of arc mechanism and arc-chutes
Mechanism arc extinguishing when dynamic and static contact is not yet opened completely, and arc-chutes are had well after dynamic and static contact is opened completely
Extinguish remaining arcing.
Flashboard 4 is shielded using high intensity, resistant to elevated temperatures engineering plastic materials.Effective disjunction as defined in product standard can be ensured
The number (most 3 times) of short circuit current.
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 (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 set up, the insulation arc-extinguishing mechanism includes shielding flashboard (4), yoke (6), rocking arm (5)
With torsion 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 Shell of circuit breaker (3)；
The upper end of the rocking arm (5) and one end of the remote static contact (1) of shielding flashboard (4) are hinged, and lower end passes through in torsion spring (7)
The fixed pin shaft (C) in heart hole is be hinged with the housing (3) of breaker, and the rank corresponding with yoke (6) is provided with the middle part of rocking arm (5)
Iron (5-1)；The both ends of the torsion spring (7) are press respectively against on rocking arm (5) and Shell of circuit breaker (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 bearing pin (4-1), and the middle part of the flashboard bearing 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 Shell of circuit breaker (3) two side.
4. the miniature circuit breaker of strong breaking capacity according to claim 3, it is characterized in that, in the Shell of circuit breaker (3)
Provided with magnetic protection electrical apparatus release (10), the lock of the electrical apparatus release push rod (10-1) and tripping mechanism (9) of the magnetic protection electrical apparatus release (10)
Detain corresponding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710727757.4A CN107393780B (en) | 2017-08-23 | 2017-08-23 | Miniature circuit breaker with strong breaking capacity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710727757.4A CN107393780B (en) | 2017-08-23 | 2017-08-23 | Miniature circuit breaker with strong breaking capacity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107393780A true CN107393780A (en) | 2017-11-24 |
| CN107393780B CN107393780B (en) | 2020-04-28 |
Family
ID=60354156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710727757.4A Active CN107393780B (en) | 2017-08-23 | 2017-08-23 | Miniature circuit breaker with strong breaking capacity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107393780B (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 |
| CN109036992A (en) * | 2018-08-08 | 2018-12-18 | 河北宝凯电气股份有限公司 | A kind of shielding arc-suppressing method of breaker |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN202839508U (en) * | 2012-10-30 | 2013-03-27 | 浙江北岛科技有限公司 | Circuit breaker |
| CN103646804A (en) * | 2013-11-30 | 2014-03-19 | 德力西电气有限公司 | Forced arc extinguishing device of circuit breaker |
| CN106783447A (en) * | 2017-03-22 | 2017-05-31 | 德力西电气有限公司 | A kind of circuit breaker forced extinguisher |
| CN206422025U (en) * | 2017-01-19 | 2017-08-18 | 上海电器股份有限公司人民电器厂 | Electromagnetic short current protective device for breaker |
-
2017
- 2017-08-23 CN CN201710727757.4A patent/CN107393780B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN202839508U (en) * | 2012-10-30 | 2013-03-27 | 浙江北岛科技有限公司 | Circuit breaker |
| CN103646804A (en) * | 2013-11-30 | 2014-03-19 | 德力西电气有限公司 | Forced arc extinguishing device of circuit breaker |
| CN206422025U (en) * | 2017-01-19 | 2017-08-18 | 上海电器股份有限公司人民电器厂 | Electromagnetic short current protective device for breaker |
| CN106783447A (en) * | 2017-03-22 | 2017-05-31 | 德力西电气有限公司 | A kind of circuit breaker forced extinguisher |
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 |
| CN109036992A (en) * | 2018-08-08 | 2018-12-18 | 河北宝凯电气股份有限公司 | A kind of shielding arc-suppressing method of breaker |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107393780B (en) | 2020-04-28 |
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