CN201725745U - Anti-falling contact mechanism for low-voltage circuit breaker - Google Patents
Anti-falling contact mechanism for low-voltage circuit breaker Download PDFInfo
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- CN201725745U CN201725745U CN2010201915857U CN201020191585U CN201725745U CN 201725745 U CN201725745 U CN 201725745U CN 2010201915857 U CN2010201915857 U CN 2010201915857U CN 201020191585 U CN201020191585 U CN 201020191585U CN 201725745 U CN201725745 U CN 201725745U
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- rotating shaft
- pivot pin
- circuit breaker
- moving contact
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Abstract
The utility model provides an anti-falling contact mechanism for a low-voltage circuit breaker, which comprises a rotating shaft, a movable contact, a static contact, a tension spring and a connecting rod, wherein a first shaft pin is arranged on the rotating shaft, a profiled groove with a downward opening is arranged in the middle of the rotating shaft, and U-shaped grooves with downward openings are symmetrically arranged on two side walls of the profiled groove; the rear part of the movable contact is embedded in the profiled groove of the rotating shaft, a second shaft pin and a third shaft pin are fixed on the movable contact, and an arc-shaped bump extending toward the right upper part is arranged on the movable contact; the front part of the movable contact extends toward one side, a first silver contact is arranged below the head part thereof; the second shaft pin is clamped in the U-shaped grooves of the rotating shaft and can rotate around and move along the U-shaped grooves; and the arc-shaped bump and the first shaft pin are connected in an abutting way, thus being in a locking or unlocking relation. The movable contact of the anti-falling contact mechanism can be opened or locked before an operating mechanism, and the unlocking speed of the operating mechanism can be totally ignored, thus guaranteeing reliable arc blowout and avoiding switch-on danger caused by fall-off of the movable contact.
Description
Technical field
The utility model relates to a kind of electric product, relates in particular to a kind of dropproof contact mechanism of low-voltage circuit breaker.
Background technology
Low-voltage circuit breaker is a kind of electric component indispensable in the distribution apparatus, generally is used for disjunction, closed circuit and functions such as short-circuit protection, overload protection are arranged in the power distribution circuit, is a kind of critical product in electric power system.
Low-voltage circuit breaker generally is made up of contact, arc control device, operating mechanism and overcurrent release mechanism.Under the normal condition, operating mechanism remains closed contact mechanism or divides to come and cut off or connect power circuit.When fault current arrives, overcurrent release mechanism detects this fault-signal, send trip signal and give operating mechanism, the operating mechanism release drives contact mechanism and opens certain distance (apart from deciding according to design, to guarantee reliable blow-out), at this moment, between dynamic and static contact, produce a bigger electric arc, and be introduced into the arc control device arc extinguishing, behind the arc extinction, promptly cut off this power circuit.
Contact system in the low-voltage circuit breaker generally is used for separately, closed circuit, in the circuit breaker of current-limiting type, generally be designed to scold the structure of open type, promptly when short circuit current (fault current) arrives, the interactional electromagnetic repulsion force that utilizes the contact system loop to be produced, (general the first half is referred to as the moving contact system to scold an open contact part in advance, the latter half is referred to as the fixed contact system), because moment has increased electric clearance, thereby play limiting short-circuit current, reduce the effect of electric arc failure energy (destructive power).
Though the contact system of above-mentioned traditional current-limiting type has been scolded out the moving contact system in advance and has been caused reducing of electric current simultaneously under the effect of electromagnetic force; but also reduced electromagnetic force in the time of the unexpected minimizing of electric current; the moving contact system may fall after rise along with reducing of electromagnetic force; the distance of originally scolding out is diminished in addition fully closed (when the alternating current zero passage or direct current because when diminishing under the effect of current limliting; moving; fixed contact is because spring force (the spring 1 shown in Figure 1) effect on the contact system is closed down; be referred to as moving contact and fall this moment); then again shown in the electromagnetic force effect under scold out; so may scold out repeatedly; closed process of scolding out again; if the operating mechanism of circuit breaker can not the quick acting release interrupt this process; the electric arc that is produced will cause the considerable damage of contact system; also might make; fixed contact can not separate because of huge heating is welded together; circuit can't in time cut off; this is breakneck in circuit breaker; not only may thoroughly damage circuit breaker, the equipment in the power circuit also can be subjected to immeasurable breaking-up because of the protective effect that loses circuit breaker.
The utility model content
The purpose of this utility model exactly in order to address the above problem, provides a kind of dropproof contact mechanism of low-voltage circuit breaker.
In order to achieve the above object, the utility model has adopted following technical scheme: a kind of dropproof contact mechanism of low-voltage circuit breaker, described low-voltage circuit breaker comprise housing and are installed in housing interior contact mechanism, arc control device, operating mechanism and overcurrent release mechanism;
Described contact mechanism is dropproof contact mechanism, and this dropproof contact mechanism comprises:
Rotating shaft is movably arranged in the housing and also can rotates by the arcwall face on housing, is fixed with first pivot pin in the rotating shaft, and the rotating shaft middle part is provided with a type groove under shed, and the type groove is arranged with downward open U-shaped channel on the two side;
Moving contact comprises the rear portion and the front portion that fuse, and the rear portion is inlaid in the type groove of rotating shaft, and the rear portion is fixed with second pivot pin and the 3rd pivot pin and is provided with an arc bump that stretches out to the upper right side; Anterior stretch out and be provided with first silver contact in its lower head to a side; Second pivot pin is installed in the U-lag of rotating shaft and can rotates and move along this U-lag; Arc bump is conflicted to link to each other with first pivot pin and is formed snap close or release relation;
Fixed contact is arranged on the lower front of moving contact and is fixed in the housing with respect to moving contact, and the above-head of fixed contact is provided with second silver contact, and this second silver contact can contact with first silver contact on the moving contact and link to each other turning circuit or disengage open circuit;
Extension spring, totally two symmetries are connected the elastic force that return is provided to moving contact between first pivot pin and the 3rd pivot pin;
Connecting rod, the one end is fixedly linked and can be driven by operating mechanism by the 4th pivot pin and operating mechanism, and first pivot pin in the other end and the rotating shaft is fixedly linked, and connecting rod can drive rotating shaft and moving contact rotates together.
Described fixed contact is horizontal U-shaped structure.
The above-head of the inherent moving contact of the housing of described low-voltage circuit breaker is provided with a skewback that reaction force can be provided to moving contact.
The dropproof contact mechanism of the utility model low-voltage circuit breaker since adopt above technical scheme, make it compared with prior art, have following advantage and characteristics:
1, having precedence over operating mechanism scolds out also dropproof.Moving contact has precedence over operating mechanism under the effect of electromagnetic repulsion force scolds out, and keeps this to scold open position, prevents to leave the position of scolding out because of the variation of electric current, plays dropproof effect;
2, simple in structure, do not increase parts.This contact mechanism has just increased an arc bump on original moving contact, moving contact is moved and self-locking along particular track, at operating mechanism action back automatic unlocking, does not influence later operation.Owing to do not increase specific component, do not influence cost.
Description of drawings
Fig. 1 be the utility model low-voltage circuit breaker dropproof contact mechanism look up structural representation;
Fig. 2 be the utility model low-voltage circuit breaker dropproof contact mechanism face the sectional structure schematic diagram;
Fig. 3, Fig. 4, Fig. 5 are the structural representations of the rotating shaft in the utility model, wherein Fig. 4 be the A-A of Fig. 3 to cutaway view, Fig. 5 is that the B-B of Fig. 3 is to cutaway view;
Fig. 6 is the structural representation of the moving contact in the utility model;
Fig. 7 is the operating principle schematic diagram of the dropproof contact mechanism of the utility model low-voltage circuit breaker.
Embodiment
Referring to Fig. 1, Fig. 2, the related low-voltage circuit breaker of dropproof contact mechanism of the utility model low-voltage circuit breaker comprises housing and is installed in housing interior contact mechanism, arc control device, operating mechanism and overcurrent release mechanism.
Contact mechanism wherein is dropproof contact mechanism, and this dropproof contact mechanism comprises rotating shaft 1, moving contact 2, fixed contact 3, extension spring 4 and connecting rod 5.
Cooperation is referring to Fig. 3, Fig. 4, Fig. 5, rotating shaft 1 in the utility model is movably arranged in the housing and can rotates by the arcwall face 6 on housing, be fixed with first pivot pin 11 in the rotating shaft 1, the rotating shaft middle part is provided with a type groove 12 under shed, and the type groove is arranged with downward open U-shaped channel 13 on the two side.
Cooperation is referring to Fig. 6, and the moving contact 2 in the utility model comprises the rear portion 21 that fuses and anterior 22, and rear portion 21 is inlaid in the type groove 12 of rotating shaft 1, is provided with an arc bump 211 that stretches out to the upper right side and is fixed with second pivot pin 212 and the 3rd pivot pin 213; Anterior 22 stretch out and are provided with first silver contact 221 in its lower head to a side; Arc bump 211 is conflicted to link to each other with first pivot pin 11 and is formed snap close or release relation; Second pivot pin 212 is installed on U-lag 13 interior can and the moving along this U-lag rotation of rotating shaft.
Fixed contact 3 is arranged on the lower front of moving contact with respect to moving contact 2 and is fixed in the housing, the above-head of fixed contact 3 is provided with second silver contact 31, and this second silver contact 31 can contact with first silver contact 221 on the moving contact and link to each other turning circuit or disengage open circuit.Fixed contact in the utility model can be designed to U-shaped structure as shown in Figure 2.
Totally two symmetries of extension spring 4 is connected the elastic force that return is provided to moving contact 2 between first pivot pin 11 and the 3rd pivot pin 213.
One end of connecting rod 5 is fixedly linked and can be driven by operating mechanism with operating mechanism by the 4th pivot pin 51, and first pivot pin 11 in the other end and the rotating shaft 1 is fixedly linked, and connecting rod 5 can drive rotating shaft 1 and moving contact 2 rotates together.
Referring to Fig. 2, Fig. 3, the utility model above-head at moving contact 2 in the housing of low-voltage circuit breaker is provided with a skewback 7 that reaction force can be provided to moving contact.
Operation principle of the present utility model can be described as follows in conjunction with Fig. 2, Fig. 7:
When short circuit current arrives, under the effect of the electromagnetic force F that produces in the loop, moving contact 2 rotates in U-lag 13 around second pivot pin 212, owing to exist in the time of arc bump 211 and U-lag 13, moving contact 2 is when second pivot pin 212 rotates, also make linear slide downwards along the U-lag 13 at second pivot pin, 212 places, when the summit of the arc bump on the moving contact 2 211 when first pivot pin 11 slips over, because the pulling of extension spring 4, the summit of arc bump 211 is promptly pinned by first pivot pin 11 after slipping over first pivot pin 11, even electromagnetic force F reduces the (minimizing of the electric current that causes along with increase of scolding out distance H and metering function, electromagnetic force also reduces) also can't drop down, thereby avoid moving contact 2 again with fixed contact 3 closures.After moving contact 2 is opened, keep a break distance H with fixed contact 3.Under this distance, electric arc is introduced arc control device and is extinguished under the effect of arc control device.Meanwhile, under this short-circuit signal, overcurrent release mechanism in the circuit breaker sends trip signal and promotes the operating mechanism release, after the release because moving contact 2 has been opened big distance earlier, during design, be provided with a skewback 7 at certain altitude, this skewback 7 is when the operating mechanism release, and certain distance is arranged between the moving contact, after the operating mechanism release, drive rotating shaft 1 and moving contact 2 upwards rotation together by connecting rod 5, moving contact 2 is promptly run into skewback 7 earlier after forwarding certain angle to, apply a reaction force for moving contact 2, direction is opposite with electromagnetic force.Under this reaction force acts, moving contact 2 returns, and after the summit of its arc bump 211 slips over first pivot pin 11 downwards, can get back to the normal position rapidly under the effect of extension spring 4, finishes the moving contact releasing process.That is to say, not release of operating mechanism, moving contact is transported forever and is remained on this open position.From this process as can be seen, moving contact 2 has precedence over operating mechanism and opens, pins, and can ignore the release speed of operating mechanism fully, guarantees reliable blow-out, also can avoid moving contact to fall and closed danger takes place.
Claims (3)
1. the dropproof contact mechanism of a low-voltage circuit breaker, described low-voltage circuit breaker comprise housing and are installed in contact mechanism, arc control device, operating mechanism and overcurrent release mechanism in the housing;
It is characterized in that described contact mechanism is dropproof contact mechanism, this dropproof contact mechanism comprises:
Rotating shaft is movably arranged in the housing and also can rotates by the arcwall face on housing, is fixed with first pivot pin in the rotating shaft, and the rotating shaft middle part is provided with a type groove under shed, and the type groove is arranged with downward open U-shaped channel on the two side;
Moving contact comprises the rear portion and the front portion that fuse, and the rear portion is inlaid in the type groove of rotating shaft, and the rear portion is fixed with second pivot pin and the 3rd pivot pin and is provided with an arc bump that stretches out to the upper right side; Anterior stretch out and be provided with first silver contact in its lower head to a side; Second pivot pin is installed in the U-lag of rotating shaft and can rotates and move along this U-lag; Arc bump is conflicted to link to each other with first pivot pin and is formed snap close or release relation;
Fixed contact is arranged on the lower front of moving contact and is fixed in the housing with respect to moving contact, and the above-head of fixed contact is provided with second silver contact, and this second silver contact can contact with first silver contact on the moving contact and link to each other turning circuit or disengage open circuit;
Extension spring, totally two symmetries are connected the elastic force that return is provided to moving contact between first pivot pin and the 3rd pivot pin;
Connecting rod, the one end is fixedly linked and can be driven by operating mechanism by the 4th pivot pin and operating mechanism, and first pivot pin in the other end and the rotating shaft is fixedly linked, and connecting rod can drive rotating shaft and moving contact rotates together.
2. the dropproof contact mechanism of low-voltage circuit breaker as claimed in claim 1, it is characterized in that: described fixed contact is horizontal U-shaped structure.
3. the dropproof contact mechanism of low-voltage circuit breaker as claimed in claim 1 is characterized in that: the above-head of the inherent moving contact of the housing of described low-voltage circuit breaker is provided with a skewback that reaction force can be provided to moving contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201915857U CN201725745U (en) | 2010-05-13 | 2010-05-13 | Anti-falling contact mechanism for low-voltage circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201915857U CN201725745U (en) | 2010-05-13 | 2010-05-13 | Anti-falling contact mechanism for low-voltage circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201725745U true CN201725745U (en) | 2011-01-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201915857U Expired - Fee Related CN201725745U (en) | 2010-05-13 | 2010-05-13 | Anti-falling contact mechanism for low-voltage circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201725745U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102243943A (en) * | 2010-05-13 | 2011-11-16 | 上海华联低压电器有限公司 | Falling-prevention contact mechanism of low-voltage circuit breaker |
| CN104040669A (en) * | 2012-01-10 | 2014-09-10 | 现代重工业株式会社 | Molded case circuit breaker |
| CN106920720A (en) * | 2015-12-28 | 2017-07-04 | Ls 产电株式会社 | The structure of the contact of air-break |
-
2010
- 2010-05-13 CN CN2010201915857U patent/CN201725745U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102243943A (en) * | 2010-05-13 | 2011-11-16 | 上海华联低压电器有限公司 | Falling-prevention contact mechanism of low-voltage circuit breaker |
| CN104040669A (en) * | 2012-01-10 | 2014-09-10 | 现代重工业株式会社 | Molded case circuit breaker |
| CN104040669B (en) * | 2012-01-10 | 2016-04-27 | 现代重工业株式会社 | Shell molds formula circuit breaker |
| CN106920720A (en) * | 2015-12-28 | 2017-07-04 | Ls 产电株式会社 | The structure of the contact of air-break |
| US10020128B2 (en) | 2015-12-28 | 2018-07-10 | Lsis Co., Ltd. | Structure of contacts for air circuit breaker |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110126 Termination date: 20150513 |
|
| EXPY | Termination of patent right or utility model |