CN102129943B - Circuit breaker - Google Patents
Circuit breaker Download PDFInfo
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- CN102129943B CN102129943B CN201010231203.3A CN201010231203A CN102129943B CN 102129943 B CN102129943 B CN 102129943B CN 201010231203 A CN201010231203 A CN 201010231203A CN 102129943 B CN102129943 B CN 102129943B
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- electric arc
- arc
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- insulation board
- contact
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- Arc-Extinguishing Devices That Are Switches (AREA)
- Breakers (AREA)
Abstract
The present invention provides a circuit breaker which can easily switch off an arc in small current switching-on or switching-off and can realize high-limit circuit break in short circuit and circuit break. The circuit breaker is provided with the following components: a fixed contactor which is provided in an insulation frame; a movable contactor which opposes the fixed contactor for contacting/separating; a switch mechanism which drives the movable contactor; an electromagnetic tripping device which responds to an overcurrent for causing the switch mechanism to operate for separating the movable contactor from the fixed contactor; an arc generation chamber which is filled with the arc that is generated in separating the movable contactor; and an arc extinguishing device which extinguishes the arc in the arc generation chamber for equipping an insulation plate with a mode that the fixed contactor and the movable contactor are sandwiched. The outside part of the insulation plate is provided with an arc driving plate with a preset clearance therebetween. An inner width of the insulation plate is smaller in a movable area of the movable contactor and is larger in an arc moving part. Furthermore the arc moving part of the insulation plate is provided with a hole which is communicated with the clearance.
Description
Technical field
The present invention relates to a kind of circuit-breaker, especially, relate to a kind of structure of the circuit-breaker that has improved opening performance.
Background technology
As existing circuit-breaker, for example disclosing following circuit-breaker in patent documentation 1,, in order stably break arc to be carried out to extinguishing arc, on arm, be provided with together with movable piece for the electric arc reflection part to electric arc moving direction reflection by electric arc, and, the contact periphery from producing electric arc to the electric arc mobile route till arc-extinction device is formed as, make the sectional area of this electric arc mobile route expand towards electric arc moving direction, and barometric gradient is set.
Patent documentation 1: TOHKEMY 2000-243208 communique
Summary of the invention
But, due in above-mentioned circuit-breaker, adopt the structure that contains the electromagnet portion of fixed contact in the opposition side configuration packet of the switching mechanism portion that comprises movable piece, so there is the limit in the length that the first reflecting part of electric arc reflection part is extended to fixed contact side, cannot guarantee significantly the distance between moving contact and fixed contact in the time that switching mechanism disconnects.Therefore,, in the time of the switch of little electric current, be sometimes difficult to the arc cutting producing between movable, fixed contact.Consequently, the contact that the electric arc during by switch causes consumes and increases, and therefore, has the problem points that cannot maintain energising performance in the time of long-term switch.
The present invention proposes in order to solve above-mentioned problem, and its object is, obtains a kind of circuit-breaker, its arc cutting during easily by little current switch, and in the time of short interruption, can carry out high current limliting and open circuit.
Circuit-breaker involved in the present invention has: fixed contact therefor, and it is arranged on the inside of insulation framework; Movable contact, it is relative with this fixed contact therefor, with this fixed contact therefor contact/separate; Switching mechanism, it drives this movable contact; Electromagnetic trip device, it makes switch mechanism movement in response to overcurrent, movable contact is separated with fixed contact therefor; Electric arc generating chamber, is wherein full of the electric arc producing when described movable contact separates; And arc-extinction device, it carries out extinguishing arc to the electric arc in this electric arc generating chamber, it is characterized in that, in the mode that clips fixed contact therefor and movable contact, insulation board is set, outside at this insulation board arranges electric arc drive plate across the gap of regulation, and the insied width of described insulation board is narrower in the movable range part of movable contact, wider at electric arc movable part, and the hole being communicated with described gap the electric arc movable part setting of insulation board.
The effect of invention
According to the present invention, the movable range part that is configured to carry out at movable contact switch due to insulation board approaches with movable contact, so the sectional area of the electric arc while opening the utmost point cannot expand significantly to this direction, and, due to by contacting with insulation board by cooling electric arc, can make arc resistance increase, so certainly can improve the switch performance under little electric current, but utilize the electric arc drive plate across gap configuration in the periphery of insulation board, can make the electric arc between contact extend to the direction of arc channel, therefore, can further improve switch performance.
In addition, due to so that insulation board arranges stage portion away from the mode of movable contact compared with the movable range part of electric arc movable part and movable contact, and, be provided with hole at electric arc movable part, so that the gas producing when short interruption from the hole of insulation board by the gap of insulation board and electric arc drive plate, flow near contact, further make near the gas pressure in explosion chamber reduce, and make near gas pressure contact increase, thereby can easily make electric arc move to explosion chamber's direction.Therefore, the extinguishing arc time shortens, and opening performance is improved, and can realize high current limliting and open circuit.
Brief description of the drawings
Fig. 1 represents the off-state of the related circuit-breaker of embodiments of the present invention 1 or the end view of tripping operation operate condition in the mode of partly cut-away.
Fig. 2 is the end view that represents the on-state of the related circuit-breaker of embodiments of the present invention 1 in the mode of partly cut-away.
Fig. 3 is the figure along direction of arrow observation along the section of the A-A line of Fig. 1.
Fig. 4 is vertical view (a), end view (b) and the front view (c) that represents the insulation board in execution mode 1.
Fig. 5 is vertical view (a), end view (b) and the front view (c) that represents the electric arc drive plate in execution mode 1.
Fig. 6 is the oblique view representing the state after the insulation board in execution mode 1, electric arc drive plate and arc channel combination.
Fig. 7 is the exploded perspective view of Fig. 6.
Embodiment
As shown in FIG. 1 to 3, circuit-breaker of the present invention has insulation framework, and it is made up of the pedestal 21 all forming with synthetic resin material and cover body 22.In this insulation framework, be relatively set with the fixed contact therefor 23 with fixed contact 24 and the movable contact 25 with moving contact 25a.Movable contact 25 is formed as, by arm 26 free to rotate support, by the rotation of movable contact 25, make fixed contact 24 and moving contact 25a contact free/separate.
On the chain shot 32 being supported by axle 27 axles, be formed with: connecting rod slot 32a, it engages with the other end of operator link 31; Trigger sheet 32b, it bears the pressing force of the bar 37 of electromagnetism trip portion 34 described later; And triggering sheet 32c, it bears and utilizes the pressing force being produced by the bending of bimetal leaf 33 described later by the power in the direction of the engaging releasing between operator link 31 and connecting rod slot 32a.Form switching mechanism by above-mentioned arm 26, main spring 28, handle 29, back-moving spring 30, operator link 31 and chain shot 32 etc.
In insulation framework, be provided with bimetal leaf 33.Bimetal leaf 33 is with corresponding in the drawings to right thermal bending by electric current.In insulation framework, electromagnetism trip portion 34 is also set, it has: plunger 36, and it drives by the electromagnetic force producing of switching on to electromagnet 35; And bar 37, its action of attraction by this plunger 36, direction is protruded left in the drawings.Form over current trip by bimetal leaf 33 and electromagnetism trip portion 34.In the electric arc generating chamber 40 that comprises fixing and movable two contacts, setting has the arc-extinction device 38 of muffler plate 39, by the electric arc in the electric arc generating chamber 40 producing between fixed contact 24 and moving contact 25a, guide to arc channel 41, utilize arc-extinction device 38 to carry out extinguishing arc.
On pedestal 21, become near of the axle 27 of the center of rotation of moving contact 25a and arm 26 in the position away from electric arc generating chamber 40, be provided with the stop 21a protruding to the inside, just advise open-circuit position when movable contact 25 is separated with fixed contact therefor 23.
Fig. 3 is the figure that the section of the A-A line along Fig. 1 is amplified and observed along the direction of arrow.Fixed contact therefor 23 and movable contact 25 are positioned at electric arc generating chamber 40, but on pedestal 21, are fixedly installed the roughly insulation board being made up of synthetic resin 1 of U font to clip the mode of above-mentioned two contacts.Be positioned at the insulation board 1 of above-mentioned two contact both sides, as shown in Figure 4, stage portion 3 is set in inner side, the interval between both sides is narrowed in the movable range part of movable contact 25, on the other hand, make at electric arc movable part to broaden compared with the interval of interval between both sides and the movable range part of movable contact 25, and at electric arc movable part, hole 4 is set.Hole 6 for locating while installation to pedestal 21 is set on insulation board 1.
In the outside of insulation board 1, by roughly the electric arc drive plate being made up of magnetic material 2 and the pedestal 21 of U font are installed in intimate contact.As shown in Figure 5, form multiple protuberances 7 in the both sides inner side of electric arc drive plate 2, they for and insulation board 1 between form gap 5 (with reference to Fig. 3).Above-mentioned gap 5 is communicated with electric arc movable part by above-mentioned hole 4, and, open near fixed contact 24 and moving contact 25a.On electric arc drive plate 2, be provided with the hole 8 for locating while installation to pedestal 21.
According to Fig. 6 and Fig. 7, further describe the relation of insulation board 1, electric arc drive plate 2 and arc channel 41.Clip from both sides to link and configure electric arc drive plate 2 for the insulation board 1 of U font.Protuberance 7 butts that protrude on inner surface due to insulation board 1 and electric arc drive plate 2, so between forms gap 5.Arc channel 41 is arranged on pedestal 21, configures insulation board 1 to surround the mode of this arc channel 41, and fixed contact therefor 23 and movable contact 25 are positioned at the space being surrounded by insulation board 1 and arc channel 41.Above-mentioned gap 5 is communicated with the hole 4 of insulation board 1, near opening arc channel 41 sides, i.e. fixed contact 24 and moving contact 25a of the rear in gap 5.
In the circuit-breaker with above-mentioned structure, carry out switch at the little electric current for the rated current that is less than or equal to circuit-breaker, utilize handle 29 to operate switching mechanism, movable contact 25 is separated with fixed contact therefor 23.Now, between fixed contact 24 and moving contact 25a, produce electric arc.Electric arc when this opens the utmost point, due to insulation board 1 be configured to movable contact 25 open the utmost point time movable range in approach with movable contact 25, so electric arc sectional area cannot expand significantly to insulation board 1 side.And, because electric arc is by contacting and be cooled with insulation board 1, make thus arc resistance increase, electric arc is disappeared, and by failure of current, so can improve the switch performance under little electric current.
Meanwhile, due to the magnetic flux that electric arc drive plate 2 magnetic induction by U font produce, the electric arc while making out the utmost point, to the direction of arc channel 41, elongation downwards in Fig. 1, so further make arc resistance increase, can make switch performance improve.In addition, in the case of opening circuit for larger short circuit current, electromagnetism trip portion 34 makes the switching mechanism action of tripping in response to short circuit current, makes movable contact 25 and fixed contact therefor 23 high-speed separation.Now, during with above-mentioned switch in the same manner, the electric arc producing when opening the utmost point, due to insulation board 1 be configured to movable contact 25 open the utmost point time movable range in approach with movable contact 25, so electric arc sectional area cannot expand significantly to insulation board 1 side.And electric arc is by contacting and be cooled with insulation board 1, thereby arc resistance is increased.And, due to the magnetic flux of the electric arc drive plate 2 magnetic induction generations by U font, make electric arc to the direction of arc channel 41, i.e. elongation downwards in Fig. 1, so the electric arc in electric arc generating chamber 40 is directed to arc channel 41, and promptly arrive arc-extinction device 38, and cut off and extinguishing arc by muffler plate 39.Therefore, make extinguishing arc time shorten, improve opening performance.
In addition, the interval of the insulation board 1 of electric arc movable part is because step 3 is wider than the movable range part of movable contact 25, and, electric arc movable part at insulation board 1 offers porose 4, and, electric arc drive plate 2 is set, and makes to there is gap 5 between itself and insulation board 1.By step 3, the interval of insulation board 1 is broadened, thereby the gas pressure of electric arc movable part is reduced.In addition, because hole 4 makes the gas producing when the short interruption by gap 5, near fixed contact 24 and moving contact 25a, flow into, near explosion chamber's 38 gas pressures are further reduced, and make near the gas pressure above-mentioned contact increase, thereby electric arc is easily moved to the direction of explosion chamber 38, so can make the extinguishing arc time shorten, improve opening performance, realize high current limliting and open circuit.
Claims (4)
1. a circuit-breaker, it has:
Fixed contact therefor, it is arranged on the inside of insulation framework;
Movable contact, it is relative with this fixed contact therefor, with this fixed contact therefor contact/separate;
Switching mechanism, it drives this movable contact;
Electromagnetic trip device, it makes described switch mechanism movement in response to overcurrent, described movable contact is separated with fixed contact therefor;
Electric arc generating chamber, is wherein full of the electric arc producing when described movable contact separates; And
Arc-extinction device, it carries out extinguishing arc to the electric arc in this electric arc generating chamber,
It is characterized in that,
In the mode that clips described fixed contact therefor and movable contact, insulation board is set, outside at this insulation board arranges across the gap of regulation the electric arc drive plate being made up of magnetic material, the insied width of described insulation board, movable range part at described movable contact is narrower, wider at electric arc movable part, and the hole being communicated with described gap the electric arc movable part setting of described insulation board, described gap is open near the fixed contact of described fixed contact therefor and the moving contact of described movable contact.
2. circuit-breaker according to claim 1, is characterized in that,
Described insulation board utilization is formed on the step of inner side, makes insied width narrower in the movable range part of described movable contact, wider at electric arc movable part.
3. circuit-breaker according to claim 1, is characterized in that,
On described electric arc drive plate, protuberance is set, by by this protuberance and described insulation board butt, and forms described gap.
4. circuit-breaker according to claim 1, is characterized in that,
Described insulation board and electric arc drive plate are all formed as U font.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010-008104 | 2010-01-18 | ||
| JP2010008104A JP5313933B2 (en) | 2010-01-18 | 2010-01-18 | Circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102129943A CN102129943A (en) | 2011-07-20 |
| CN102129943B true CN102129943B (en) | 2014-06-18 |
Family
ID=44267985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010231203.3A Active CN102129943B (en) | 2010-01-18 | 2010-07-19 | Circuit breaker |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP5313933B2 (en) |
| CN (1) | CN102129943B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200471559Y1 (en) | 2013-01-24 | 2014-03-13 | 김성곤 | Miniature circuit breaker |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1080780A (en) * | 1992-07-02 | 1994-01-12 | 三菱电机株式会社 | Switch |
| CN1152183A (en) * | 1995-12-08 | 1997-06-18 | 三菱电机株式会社 | Circuit breaking device |
| CN1343367A (en) * | 1999-12-02 | 2002-04-03 | 三菱电机株式会社 | Circuit breaker |
| EP1463075A2 (en) * | 2003-03-22 | 2004-09-29 | ABB PATENT GmbH | Stack of arc extinguishing blades for an electrical switch, in particular for an electrical circuit breaker |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55152654U (en) * | 1979-04-18 | 1980-11-04 | ||
| JPS628421A (en) * | 1985-07-02 | 1987-01-16 | 三菱電機株式会社 | Arc extinguisher |
| JPS63139749U (en) * | 1987-03-05 | 1988-09-14 | ||
| JPS6431626U (en) * | 1987-08-19 | 1989-02-27 | ||
| JPH05135681A (en) * | 1991-11-11 | 1993-06-01 | Matsushita Electric Works Ltd | Device for extinguishing arc |
| JP2000243208A (en) * | 1999-02-16 | 2000-09-08 | Mitsubishi Electric Corp | Circuit breaker |
-
2010
- 2010-01-18 JP JP2010008104A patent/JP5313933B2/en active Active
- 2010-07-19 CN CN201010231203.3A patent/CN102129943B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1080780A (en) * | 1992-07-02 | 1994-01-12 | 三菱电机株式会社 | Switch |
| CN1152183A (en) * | 1995-12-08 | 1997-06-18 | 三菱电机株式会社 | Circuit breaking device |
| CN1343367A (en) * | 1999-12-02 | 2002-04-03 | 三菱电机株式会社 | Circuit breaker |
| EP1463075A2 (en) * | 2003-03-22 | 2004-09-29 | ABB PATENT GmbH | Stack of arc extinguishing blades for an electrical switch, in particular for an electrical circuit breaker |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5313933B2 (en) | 2013-10-09 |
| CN102129943A (en) | 2011-07-20 |
| JP2011146335A (en) | 2011-07-28 |
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