CN102243944A - Double-breakpoint contact mechanism of low-voltage circuit breaker - Google Patents
Double-breakpoint contact mechanism of low-voltage circuit breaker Download PDFInfo
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- CN102243944A CN102243944A CN2010101726737A CN201010172673A CN102243944A CN 102243944 A CN102243944 A CN 102243944A CN 2010101726737 A CN2010101726737 A CN 2010101726737A CN 201010172673 A CN201010172673 A CN 201010172673A CN 102243944 A CN102243944 A CN 102243944A
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- circuit breaker
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Abstract
The invention provides a double-breakpoint contact mechanism of a low-voltage circuit breaker. The double-breakpoint contact mechanism comprises a movable contact, a static contact, a resistor and a conducting plate, wherein the movable contact is movably arranged on a base inside a shell and capable of rotating; the static contact is movably arranged on a support inside the shell and capable of rotating; the conducting plate is fixedly arranged on the base inside the shell; the movable contact and the static contact are in contact connection with each other and form a first breakpoint capable of breaking a circuit; the static contact and the conducting plate are in contact connection with each other and form a second breakpoint capable of breaking the circuit; and the resistor is connected between the static contact and the conducting plate through lead wires. The double-breakpoint contact mechanism of the low-voltage circuit breaker has a simple structure, low cost and high current limiting capability; and as a high-resistance absorption loop has a function of absorbing energy efficiently, short-circuit current is limited greatly, energy of an arc is reduced, extinguishment of the arc is facilitated and the destructiveness of the arc is reduced.
Description
Technical field
The present invention relates to a kind of electric product, relate in particular to a kind of double break 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.
Low-voltage circuit breaker is a kind of protection electrical equipment, and wherein one of function is to avoid equipment to be subjected to the damage of short circuit current in power circuit, and the size of short circuit current is determined by the capacity of electric power system of living in, and capacity is big, and short circuit current is also big.That is to say, in the large-capacity power circuit, must in time cut off the super large short circuit current, like this to the Capability Requirement of the disjunction short circuit current of circuit breaker than higher.For reaching this purpose, the contact mechanism of circuit breaker generally is designed to scold the flow restriction of open type, promptly when short circuit current (fault current) arrives, the interactional electromagnetic repulsion force that utilizes the contact mechanism loop to be produced, scold an open contact part (general the first half is referred to as dynamic contact mechanism, and the latter half is referred to as static contact mechanism) in advance, because moment has increased electric clearance, thereby play limiting short-circuit current, reduce the effect of electric arc failure energy (destructive power).This structure cardinal principle is to accelerate extinguishing of electric arc by the restriction electric current and by arc control device absorption system energy.
The short circuit breaking capacity of said structure is not very high, for this reason, designed a kind of double-breakpoint structure both at home and abroad at present again, promptly on moving contact again serial or parallel connection increase a breakpoint, on a loop, form two arc zones, can effectively improve short circuit breaking capacity.Like this, breaking capacity is to have improved, but because increased a breakpoint, in order to guarantee reliable contact, must increase by one group of spring force again.So, cause the power of the operating mechanism of product to increase one times, and make the entire product overall volume also increase many (because the existence in two arc extinguishing zones), arc control device also increase to two, and cost has also risen.
Summary of the invention
Purpose of the present invention in order to overcome the problems referred to above that prior art exists, provides a kind of double break contact mechanism of low-voltage circuit breaker exactly.
In order to achieve the above object, the present invention has adopted following technical scheme: a kind of double break contact mechanism of low-voltage circuit breaker, described low-voltage circuit breaker comprises housing and is installed in housing interior contact mechanism, arc control device, operating mechanism and overcurrent release mechanism, be provided with the support that is used to install above-mentioned parts in housing; Be characterized in that described contact mechanism is a double break contact mechanism, this double break contact mechanism comprises moving contact, fixed contact, resistance and conductive plate; Moving contact is movably arranged on the interior base of housing rotatable, fixed contact is movably arranged on the interior support of housing rotatable, conductive plate is fixedly mounted on the interior base of housing, but contact first breakpoint of continuous and formation open circuit between moving contact and the fixed contact, but contact second breakpoint of continuous and formation open circuit between fixed contact and the conductive plate, resistance is connected between fixed contact and the conductive plate by flexible conductor.
The lower head of described moving contact is provided with first silver contact, the above-head of described fixed contact is provided with second silver contact, the afterbody below of fixed contact is provided with the 3rd silver contact, the afterbody top of described conductive plate is provided with the 4th silver contact, but contact first breakpoint of continuous and formation open circuit between first silver contact and second silver contact, but contact second breakpoint of continuous and formation open circuit between the 3rd silver contact and the 4th silver contact.
Described fixed contact links to each other with the support in the housing is rotatable by a pivot pin, and stretch out to the both sides of fixed contact at the two ends of this pivot pin, and a Spring Card is enclosed within the two ends of pivot pin, and an end of spring is stuck on the interior support of housing, and the other end is stuck in the lower head of fixed contact.
Be with insulating sleeve on the described flexible conductor that is connected between conductive plate and the resistance.
Described fixed contact is provided with arc insulating apparatus.
The double break contact mechanism of low-voltage circuit breaker of the present invention since adopt above technical scheme, make it compared with prior art, have following advantage and characteristics:
1, simple in structure, cost is low.Owing between fixed contact and conductive plate, be in series with a resistance, can form the high resistance absorption circuit, reduced by an arc quenching system than traditional double-breakpoint structure, save raw and processed materials, and reduced the volume of product effectively.
2, current limiting capacity is strong.Because the high resistance absorption circuit has the effect of efficient absorption energy, has limited short circuit current greatly, has reduced arc energy, more helps extinguishing of electric arc, has reduced the destructiveness of electric arc.
Description of drawings
Fig. 1, Fig. 2 are the structural representations of the double break contact mechanism of low-voltage circuit breaker of the present invention;
Fig. 3, Fig. 4 are the partial structurtes schematic diagrames of the double break contact mechanism of low-voltage circuit breaker of the present invention;
Fig. 5, Fig. 6 are the partial structurtes schematic diagrames of the double break contact mechanism of low-voltage circuit breaker of the present invention;
Fig. 7 is the structural representation of the spring among the present invention.
Embodiment
Referring to Fig. 1, Fig. 2, cooperation is referring to Fig. 3, Fig. 4, Fig. 5, Fig. 6, the related low-voltage circuit breaker of double break contact mechanism of low-voltage circuit breaker of the present invention comprises housing 1 and is installed in housing interior contact mechanism, arc control device, operating mechanism and overcurrent release mechanism, be provided with the support 11 that is used to install above-mentioned parts in housing.Contact mechanism wherein is a double break contact mechanism, and this double break contact mechanism comprises moving contact 2, fixed contact 3, resistance 4 and conductive plate 5.It is rotatable that moving contact 2 is movably arranged on the base in the housing (annexation be limited to drawing length not shown come out), fixed contact 3 is movably arranged on the interior support 11 of housing rotatable, conductive plate 5 is fixedly mounted on the interior base 12 of housing, but contact first breakpoint of continuous and formation open circuit between moving contact 2 and the fixed contact 3, but contact second breakpoint of continuous and formation open circuit between fixed contact 3 and the conductive plate 5, resistance 4 is connected between fixed contact 3 and the conductive plate 5 by flexible conductor 6 and 7.On flexible conductor 7, be with insulating sleeve 10.
The lower head of the moving contact 2 among the present invention is provided with first silver contact 21, the above-head of fixed contact 3 is provided with second silver contact 31, the afterbody below of fixed contact is provided with the 3rd silver contact 32, the afterbody top of conductive plate 5 is provided with the 4th silver contact 51, but contact first breakpoint of continuous and formation open circuit between first silver contact 21 and second silver contact 31, but contact second breakpoint of continuous and formation open circuit between the 3rd silver contact 32 and the 4th silver contact 51.
Fixed contact 3 is by 11 rotatable the linking to each other of support in a pivot pin 8 and the housing, stretch out to the both sides of fixed contact at the two ends of this pivot pin, one spring 9 is fastened in the two ends (cooperating referring to Fig. 7) of pivot pin 8, and an end 91 of spring is stuck on the interior support 11 of housing, and the other end 92 is stuck in the lower head of fixed contact.On fixed contact 3, be provided with arc insulating apparatus 33,34.Arc insulating apparatus 33,34 is made by resistant to elevated temperatures insulating material.
Shown in Fig. 3,13 is support plate, and it and support 11 are by rivet 14 riveted and fixed, and support plate 13 is made by non-metal insulating material, and support 11 is made by metal material.
Be lined with a magnetic conductive board 15 between support plate 13 and conductive plate 5, and be fixed together with securing member 16 and conductive plate 5, magnetic conductive board 15 is by the magnetic conductive metal material.
Operation principle of the present invention can be described as follows in conjunction with Fig. 1, Fig. 2:
As shown in Figure 1, under the normal condition (no short circuit current), moving contact 2 and fixed contact 3 form a U-shaped loop, there is a pair of electromagnetism reaction force to exist each other, and because the electric current under the normal condition is less, formed electromagnetic force is far smaller than the pressure that dynamic/static contact is in contact with one another, so make dynamic/static contact reliably contact, and fixed contact is pushed down conductive plate 5 under the effect of spring 9, makes silver contact 3 and silver contact 4 that bigger pressure be arranged mutually, forms conductive branch, the resistance of this conductive branch is owing to be far longer than the resistance of resistance 4, so under the state, minimum by the actual electric current that passes through in high resistance loop that resistance 4 constitutes, can ignore.
As shown in Figure 2, when short circuit current arrived, the electromagnetic force between the U-shaped loop was very big, during spring force on surpassing system separately, moving contact 2 is moved upward to direction shown in the arrow (counterclockwise) by the electromagnetic force effect, and fixed contact 3 is subjected to the electromagnetic force effect to moving clockwise.At this moment, second breakpoint between fixed contact 3 and the conductive plate 5 disconnects, and causes original conductive branch to disconnect, and electric current forms the loop by resistance 4.Because whole fixed contact system in fact still forms a conductive channel, that is to say, though formed second breakpoint, but still do not have electric arc to produce, so the arc control device arc extinguishing need be set.And the electric arc that the first breakpoint place between dynamic static joint 2 and the fixed contact 3 forms is introduced into arc control device and carries out arc extinguishing.Because the resistance of resistance 4 is very big, so can be limited in short circuit current in the very little scope, helps extinguishing of electric arc.
Claims (5)
1. the double break contact mechanism of a low-voltage circuit breaker, described low-voltage circuit breaker comprises housing and is installed in contact mechanism, arc control device, operating mechanism and overcurrent release mechanism in the housing, be provided with the support that is used to install above-mentioned parts in housing;
It is characterized in that: described contact mechanism is a double break contact mechanism, and this double break contact mechanism comprises moving contact, fixed contact, resistance and conductive plate; Moving contact is movably arranged on the interior base of housing rotatable, fixed contact is movably arranged on the interior support of housing rotatable, conductive plate is fixedly mounted on the interior base of housing, but contact first breakpoint of continuous and formation open circuit between moving contact and the fixed contact, but contact second breakpoint of continuous and formation open circuit between fixed contact and the conductive plate, resistance is connected between fixed contact and the conductive plate by flexible conductor.
2. the double break contact mechanism of low-voltage circuit breaker as claimed in claim 1, it is characterized in that: the lower head of described moving contact is provided with first silver contact, the above-head of described fixed contact is provided with second silver contact, the afterbody below of fixed contact is provided with the 3rd silver contact, the afterbody top of described conductive plate is provided with the 4th silver contact, but contact first breakpoint of continuous and formation open circuit between first silver contact and second silver contact, but contact second breakpoint of continuous and formation open circuit between the 3rd silver contact and the 4th silver contact.
3. the double break contact mechanism of low-voltage circuit breaker as claimed in claim 1, it is characterized in that: described fixed contact links to each other with the support in the housing is rotatable by a pivot pin, stretch out to the both sides of fixed contact at the two ends of this pivot pin, one Spring Card is enclosed within the two ends of pivot pin, one end of spring is stuck on the interior support of housing, and the other end is stuck in the lower head of fixed contact.
4. the double break contact mechanism of low-voltage circuit breaker as claimed in claim 1 is characterized in that: be with insulating sleeve on the described flexible conductor that is connected between conductive plate and the resistance.
5. the double break contact mechanism of low-voltage circuit breaker as claimed in claim 1, it is characterized in that: described fixed contact is provided with arc insulating apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101726737A CN102243944A (en) | 2010-05-13 | 2010-05-13 | Double-breakpoint contact mechanism of low-voltage circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101726737A CN102243944A (en) | 2010-05-13 | 2010-05-13 | Double-breakpoint contact mechanism of low-voltage circuit breaker |
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| Publication Number | Publication Date |
|---|---|
| CN102243944A true CN102243944A (en) | 2011-11-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101726737A Pending CN102243944A (en) | 2010-05-13 | 2010-05-13 | Double-breakpoint contact mechanism of low-voltage circuit breaker |
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| CN (1) | CN102243944A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108242373A (en) * | 2018-02-27 | 2018-07-03 | 首瑞（天津）电气设备有限公司 | A kind of breaker |
| CN110581045A (en) * | 2019-09-12 | 2019-12-17 | 南京日新科技有限公司 | Isolated contact mechanism for circuit breaker |
| CN111161985A (en) * | 2018-11-07 | 2020-05-15 | 上海良信电器股份有限公司 | Switch contact system |
| WO2022012517A1 (en) * | 2020-07-13 | 2022-01-20 | 北京京人电器有限公司 | Circuit breaker of multi-breakpoint contact system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0652777A (en) * | 1992-03-13 | 1994-02-25 | Merlin Gerin | Breaker for wiring |
| US20050184837A1 (en) * | 2004-02-19 | 2005-08-25 | Akifumi Sato | Contactor device of circuit breaker |
| CN2870151Y (en) * | 2005-09-27 | 2007-02-14 | 宁波奇乐电器实业总公司 | Contact system of low-voltage circuit breaker |
| CN201725752U (en) * | 2010-05-13 | 2011-01-26 | 上海华联低压电器有限公司 | Double break contact mechanism of low-voltage circuit breaker |
-
2010
- 2010-05-13 CN CN2010101726737A patent/CN102243944A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0652777A (en) * | 1992-03-13 | 1994-02-25 | Merlin Gerin | Breaker for wiring |
| US20050184837A1 (en) * | 2004-02-19 | 2005-08-25 | Akifumi Sato | Contactor device of circuit breaker |
| CN2870151Y (en) * | 2005-09-27 | 2007-02-14 | 宁波奇乐电器实业总公司 | Contact system of low-voltage circuit breaker |
| CN201725752U (en) * | 2010-05-13 | 2011-01-26 | 上海华联低压电器有限公司 | Double break contact mechanism of low-voltage circuit breaker |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108242373A (en) * | 2018-02-27 | 2018-07-03 | 首瑞（天津）电气设备有限公司 | A kind of breaker |
| CN111161985A (en) * | 2018-11-07 | 2020-05-15 | 上海良信电器股份有限公司 | Switch contact system |
| CN110581045A (en) * | 2019-09-12 | 2019-12-17 | 南京日新科技有限公司 | Isolated contact mechanism for circuit breaker |
| WO2022012517A1 (en) * | 2020-07-13 | 2022-01-20 | 北京京人电器有限公司 | Circuit breaker of multi-breakpoint contact system |
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| PB01 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20111116 |