CN101488425A - Circuit breaker - Google Patents
Circuit breaker Download PDFInfo
- Publication number
- CN101488425A CN101488425A CNA2008100969804A CN200810096980A CN101488425A CN 101488425 A CN101488425 A CN 101488425A CN A2008100969804 A CNA2008100969804 A CN A2008100969804A CN 200810096980 A CN200810096980 A CN 200810096980A CN 101488425 A CN101488425 A CN 101488425A
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- CN
- China
- Prior art keywords
- contact
- insulant
- mentioned
- circuit
- movable contact
- 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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- Breakers (AREA)
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention relates to a circuit breaker which enhances current limiting property during circuit interrupting by correctly controlling internal pressure near to a contact pair. The circuit breaker comprises a power supply side terminal and a load side terminal both of which are provided with fixation contacts cooperating with a movable contact of a movable contact piece, wherein current passes through the movable contact when short circuit occurs, so that electromagnetic repulsion is generated for rebounding the movable contact piece to the interrupting position; a rotation drive stick for transporting revolving force to the movable piece; and an extension spring which applies pressure to the movable contact piece at a close-up position of the circuit breaker, wherein insulation objects are positioned near each pair of movable contact and the fixation contact of the power supply side terminal and the load side terminal, arc extinction gas is released by using electric arc between each contacts when the circuit is interrupted to enhance current limitation performance, wherein the extinction gas quantity generated by the insulation object at one side is different from extinction gas quantity generated by the insulation object at the other side.
Description
Technical field
The present invention relates to the circuit-breaker that Inturruptor for sub-line or residual current circuit breaker etc. have the movable contact of rotation, particularly relate to following circuit-breaker, it disposes insulant near paired moving contact and fixed contact, be used for discharging extinguishing arc gas to improve current limiting performance when opening circuit.
Background technology
In existing circuit-breaker, the movable contact of rotation adopts the structure (for example, with reference to patent documentation 1) that is used for producing the insulating element of extinguishing arc gas near the configuration contact when opening circuit.
Patent documentation 1: No. 3392441 communique of patent (～the 4 page of left hurdle of the 48th row, the 3rd page of right hurdle the 20th row, Fig. 6)
Summary of the invention
In existing circuit-breaker, near the fixed contact that 2 moving contacts that are arranged at movable contact two ends are switched on contacting with above-mentioned moving contact respectively, be used for when opening circuit, discharging the insulant that extinguishing arc gas improves current limiting performance thereby dispose, but because it is identical with shape near the material of insulant to be arranged on two contacts, therefore can't obtain original opening performance, in addition, existence is risen because of the internal pressure of insulant is excessive must use high-intensity sheathing material, the problem that cost is increased.
The present invention proposes in order to address the above problem, its objective is provides a kind of circuit-breaker, to be arranged on 2 contacts different with the structure of the insulant of opposite side (shape, material) near the insulant of a side by making for they, thereby can control near the interior pressure the contact the most rightly, improve the current limiting performance when opening circuit, can reduce the sheathing material price and cutting down cost simultaneously.
Circuit-breaker involved in the present invention has: the movable contact of rotation, and its both ends have moving contact; Power supply side terminal and load side terminal, it is provided with the fixed contact of and co-operating paired with the moving contact of this movable contact, when short circuit current occurring, flow through electric current, make above-mentioned movable contact produce the electromagnetic repulsion force that knock-ons to open position to above-mentioned moving contact; The rotating drive rod, it is used for transmitting revolving force to above-mentioned movable contact; And extension spring, it is fixed on this rotating drive rod, on the on-position of circuit breaker, above-mentioned moving contact is pushed to above-mentioned fixed contact, apply the contact force of movable contact, in this circuit-breaker, above-mentioned power supply side terminal and load side terminal separately paired moving contact and fixed contact near dispose insulant, its be used for when opening circuit, utilizing each contact between electric arc and discharge extinguishing arc gas to improve current limiting performance, above-mentioned insulant is configured to, and the extinguishing arc gas flow that the insulant of a side (power supply side terminal) produces is different with the extinguishing arc gas flow that the insulant of opposite side (load side terminal) produces.
The effect of invention
Circuit breaker in a circuit according to the invention, to be arranged on 2 contacts different with material to a near shape (allocation position) with another insulant of insulant by making, thereby make them have different extinguishing arc gas generating amounts, near the interior pressure in contact can be controlled thus the most rightly, the current limiting performance when opening circuit can be improved.In addition, can adopt cheap sheathing material, can cutting down cost.
Above-mentioned and other purpose, feature and effect of the present invention can become more clear by detailed description in the following execution mode and accompanying drawing.
Description of drawings
Fig. 1 is the profile of off-state of the circuit-breaker of expression the 1st execution mode of the present invention.
Fig. 2 is the profile of on-state of the circuit-breaker of expression the 1st execution mode of the present invention.
Fig. 3 is after the A of Fig. 1 of expression the 1st execution mode of the present invention-A line cut-out, the profile around the expression fixed contact.
Fig. 4 is after the B of Fig. 1 of expression the 1st execution mode of the present invention-B line cut-out, the profile around the expression fixed contact.
Embodiment
The 1st execution mode.
Below, the circuit-breaker of the 1st execution mode of the present invention is described with reference to Fig. 1～Fig. 4.Fig. 1 is the profile of off-state of movable contact of the circuit-breaker of expression the 1st execution mode of the present invention, Fig. 2 is the profile of the on-state of indication circuit circuit breaker, Fig. 3 is the fixed contact profile on every side after A-A line cut-out of representing along Fig. 1, and Fig. 4 is the fixed contact profile on every side after B-B line cut-out of representing along Fig. 1.In addition, among each figure, same label is represented identical or suitable part.
In Fig. 1～Fig. 4, movable contact 1, power supply side terminal 2 and load side terminal 3 are set in the explosion chamber 7 that is provided with exhaust outlet 7a, 7b, revolving force by transmitting from mechanism (not shown) via rotating drive rod 6 makes movable contact 1 carry out rotational action.When circuit-breaker is connected, as shown in Figure 2, the fixed contact 3a butt on the moving contact 1a and the fixed contact 2a butt that is arranged on the end of power supply side terminal 2, another moving contact 1b and an end that is arranged on load side terminal 3.
On the opposite end in the end with fixed contact 2a is set of power supply side terminal 2, be provided with and be used for the bolt hole 2b that is connected with electric wire, on the opposite end in the end with fixed contact 3a is set of load side terminal 3, be provided with and be used for the bolt hole 3b that is connected with the overcurrent tripping element.
In addition, in order when circuit-breaker is connected, to produce the contact contact pressure with moving contact 1a, the 1b of movable contact 1, configuration extension spring 4,5 in rotating drive rod 6 to fixed contact 2a, 3a pushing.
As Fig. 1, shown in Figure 3, in the two sides of moving contact 1a and fixed contact 2a insulant 8 is set, its extreme direction of opening to moving contact 1a is extended, and is used for discharging extinguishing arc gas to improve current limiting performance when short circuit is tripped.In addition, as Fig. 1, shown in Figure 4, two sides at moving contact 1b and fixed contact 3a are provided with insulant 9, its extreme direction of opening to moving contact 1b is extended, be used for when short circuit is tripped, discharging extinguishing arc gas to improve current limiting performance, flat part 9a is set on insulant 9, make its cover fixed contact 3a around.In addition, between the distance L between two sides of insulant 8 and two sides of insulant 9 apart from M, become distance L〉apart from M.
In the explosion chamber of the circuit-breaker of the 1st execution mode that constitutes in this manner, when short circuit is tripped, because the electric arc heat energy nearer, that receive that insulant 9 distances produce is more, therefore with by the contact of moving contact 1a and fixed contact 2a between the heat energy of the electric arc that produces cause comparing from the extinguishing arc gas that insulant 8 produces, by the contact of moving contact 1b and fixed contact 3a between the heat energy of the electric arc that produces cause the burst size of the extinguishing arc gas that produces from insulant 9 bigger.
Therefore, compare with fixed contact 3a both sides with fixed contact 2a and moving contact 1b, can further improve current limiting performance with identical shaped insulant 8 being configured in moving contact 1a.
On the other hand, under the situation that identical shaped insulant 9 is configured in moving contact 1a and fixed contact 2a and moving contact 1b and fixed contact 3a both sides, may produce excessive interior pressure, and the material of explosion chamber 7 must be changed to expensive high-strength material, yet by at two contacts to disposing variform insulant 8,9, the interior pressure that is produced can be reduced, the cost of explosion chamber's material can also be reduced.
Insulant in addition, cutting off under the situation of the electric current that is several times as much as rated current repeatedly, if, then can occur the insulation resistance decline on insulant surface too near the contact and be difficult to cut off the phenomenon of electric current.
In the 1st execution mode, be two sides equally at moving contact 1b and fixed contact 3a, in position configuration insulant 9 is arranged near the contact, thereby be unsuitable in the above-mentioned galvanic areas that is several times as much as rated current, cutting off repeatedly, but owing to be arranged in series in the insulant 8 of contact in the circuit, that be arranged on opposite side to place, the two sides of 1a and 2a, with insulant away from contact configurations, therefore, even when cut-out was several times as much as the electric current of rated current repeatedly, opening performance was also no problem.
In addition, be that this angle of distance (shape of insulant) from insulant and electric arc is narrated in the above description, but for example at two contacts to and be provided with under the situation of identical shaped insulant, by adopt gas generated many insulant materials in a side, opposite side adopts gas generated few insulant material, can certainly obtain same effect.
Claims (3)
1. circuit breaker, it has:
The movable contact of rotation, its both ends have moving contact;
Power supply side terminal and load side terminal, it is provided with the fixed contact of and co-operating paired with the moving contact of this movable contact, when short circuit current occurring, flow through electric current, make above-mentioned movable contact produce the electromagnetic repulsion force that knock-ons to open position to above-mentioned moving contact;
The rotating drive rod, it is used for transmitting revolving force to above-mentioned movable contact; And
Extension spring, it is fixed on this rotating drive rod, on the on-position of circuit breaker above-mentioned moving contact is pushed to above-mentioned fixed contact, applies the contact force of movable contact,
It is characterized in that,
Above-mentioned power supply side terminal and load side terminal separately paired moving contact and fixed contact near dispose insulant, its be used for when opening circuit, utilizing each contact between electric arc and discharge extinguishing arc gas to improve current limiting performance, above-mentioned insulant is configured to, and a side is the extinguishing arc gas flow that produces of the insulant of power supply side terminal with opposite side is that the extinguishing arc gas flow of insulant generation of load side terminal is different.
2. circuit-breaker according to claim 1 is characterized in that,
Insulant by making an above-mentioned side is different with the insulant shape of above-mentioned opposite side, thereby makes the extinguishing arc gas flow difference of generation.
3. circuit-breaker according to claim 1 is characterized in that,
The material of the insulant by making an above-mentioned side and the insulant of above-mentioned opposite side is different, thereby makes the extinguishing arc gas flow difference of generation.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008008065A JP4776638B2 (en) | 2008-01-17 | 2008-01-17 | Circuit breaker |
| JP2008-008065 | 2008-01-17 | ||
| JP2008008065 | 2008-01-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101488425A true CN101488425A (en) | 2009-07-22 |
| CN101488425B CN101488425B (en) | 2011-05-25 |
Family
ID=40891250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100969804A Expired - Fee Related CN101488425B (en) | 2008-01-17 | 2008-05-14 | Circuit breaker |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4776638B2 (en) |
| CN (1) | CN101488425B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103094012A (en) * | 2011-10-28 | 2013-05-08 | 三菱电机株式会社 | Circuit breaker |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102856134B (en) * | 2011-06-29 | 2015-03-25 | 上海良信电器股份有限公司 | Breaker and moving contact system thereof |
| CN106298297A (en) * | 2016-08-31 | 2017-01-04 | 陈国良 | There is the chopper of double-contact moving contact and with the electric power plug socket of leakage switch |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2640027Y (en) * | 2003-08-10 | 2004-09-08 | 周朝济 | Current-limiting device wiht repulsion mechanism |
| JP4200301B2 (en) * | 2003-09-16 | 2008-12-24 | 富士電機アセッツマネジメント株式会社 | Circuit breaker |
| CN100418172C (en) * | 2005-04-15 | 2008-09-10 | 德力西电气有限公司 | Current-limiting mechanism for circuit breaker |
-
2008
- 2008-01-17 JP JP2008008065A patent/JP4776638B2/en not_active Expired - Fee Related
- 2008-05-14 CN CN2008100969804A patent/CN101488425B/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103094012A (en) * | 2011-10-28 | 2013-05-08 | 三菱电机株式会社 | Circuit breaker |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101488425B (en) | 2011-05-25 |
| JP2009170299A (en) | 2009-07-30 |
| JP4776638B2 (en) | 2011-09-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| 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: 20110525 Termination date: 20200514 |