CN100337289C - Electric circuit breaker - Google Patents
Electric circuit breaker Download PDFInfo
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- CN100337289C CN100337289C CNB2003101203876A CN200310120387A CN100337289C CN 100337289 C CN100337289 C CN 100337289C CN B2003101203876 A CNB2003101203876 A CN B2003101203876A CN 200310120387 A CN200310120387 A CN 200310120387A CN 100337289 C CN100337289 C CN 100337289C
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- electric arc
- arc
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- movable connector
- muffler
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Abstract
To provide a circuit breaker which can bring the whole arc to an arc-extinguishing device quickly and has a high breaking performance even when breaking a high current such as a short circuit current. The circuit breaker comprises a fixed contact piece 4 having a fixed contact point 3; a movable contact piece 1 having a movable contact point 2 making contact with/coming off the fixed contact point; an arc-extinguishing device 20 which injects an arc onto a plurality of arc-extinguishing plates 11, partitions the arc, and extinguishes the arc, where the arc occurs between a pair of contact points composed of the fixed contact point and the movable contact point, when the movable contact point comes off; and a pair of fixed contact side steering members and movable contact side steering members 10, 101, 13, which steer the arc from the pair of the contact points to the arc-extinguishing device. The surface direction component of arc-extinguishing plate for the arc-extinguish plates 11a placed at the latter arrival side of the arc to the arc-extinguishing device at a distance between the fixed contact point and an arc injection position on the end surface side of the pair of the contact points is larger than the similar surface direction component for the other arc-extinguish plates 11b. The surface direction component of arc-extinguishing plate for the arc-extinguish plates 11a placed at the latter arrival side of the arc to the arc-extinguishing device at a distance between the fixed contact point and an arc injection position on the end surface side of the pair of the contact points is larger than the surface direction component of arc-extinguishing plate for the other arc-extinguish plates 11b, at a distance between the fixed contact point and an arc injection position on the end surface side of the pair of the contact points.(C)2004,JPO&NCIPI.
Description
Technical field
The present invention relates to interdict when overcurrent such as overload electric current or short circuit current take place the circuit breaker of circuit.
Background technology
In circuit breaker in the past, promptly at the main circuit that is formed on after inserting contact portion between power supply one side terminal and load one side terminal, if excessive electric current is just forced to make in the circuit breaker that contact portion opens by main circuit when contact portion closed, be provided with each contact that constitutes contact portion and be electrically connected respectively, extending by acting on the direction of the electromagnetic force on the electric arc with the interaction in magnetic field around the contact portion, the a pair of electric arc opposite each other plate of advancing, the advance sidewall in space of plate of two electric arcs is being accommodated in formation, make distance each other (for example enlarge to the direction of the electromagnetic force that acts on electric arc, open flat 7-226145 communique, Fig. 5～8 with reference to the spy).
In addition, in other circuit breakers in the past, promptly has the movable connector that the relative fixed connector can dispose to free contact separation in the insulation framework inside that constitutes by base and cover, support the arm of this movable connector, drive the switching mechanism of described movable connector, the overcurrent that the response overcurrent makes described movable connector action and described movable connector is left is drawn back device, the electric arc generation chamber that the electric arc that quilt produces when described movable connector leaves is full of, electric arc in this electric arc generation chamber is carried out in the circuit breaker of arc-extinction device of extinguishing arc, the fixed part of the keeper of the open-circuit position that becomes described movable connector away from the position of described electric arc generation chamber (for example is configured in, open flat 10-172409 communique with reference to the spy, Fig. 1).
In such circuit breaker, particularly when the blocking of short circuit current, have contact between the electric arc point that produces can't advance to the structure of circuit breaker continuously (the electric arc course is discontinuous, the structure that needs the change of current) or from contact to the moving than the mobile phase of the opposing party's electric arc end slowly of electric arc end of a side that the arc-extinction device is the structure of convex surface along the cross section of the electric arc direct of travel of electric arc running face, sometimes also stagnate halfway, can't be thereby exist rapidly the whole shortcoming that imports in the arc-extinction device of electric arc.
Like this, because can't can't obtain the problem of interdicting performance at a high speed so exist rapidly in the whole importing of the electric arc arc-extinction device.
Summary of the invention
The present invention proposes in order to solve described problem points in the past, and its purpose is: when big electric currents such as short circuit current interdict, can promptly import electric arc integral body in the arc-extinction device, thus the circuit breaker with high blocking performance.
Circuit breaker of the present invention comprises: the fixed engagement device with fixed contact; Has movable connector with the travelling contact of described fixed contact contact separation; When described travelling contact leaves, make at the electric arc of the contact that constitutes by described fixed contact and travelling contact and incide a plurality of muffler plates and block the arc-extinction device of back extinguishing arc a generation; And described electric arc from described contact to a pair of fixed engagement device one side that is directed to described arc-extinction device and movable connector one side electric arc guiding elements; Wherein: the described contact of muffler plate that arrives the slow side of described arc-extinction device at electric arc is bigger to the plate face direction composition of the described muffler plate of the electric arc incoming position of a side end face and the distance between the described fixed contact than the described contact of other muffler plates to the plate face direction composition of the described muffler plate of the electric arc incoming position of a side end face and the distance between the described fixed contact.
In addition, circuit breaker comprises: the fixed engagement device with fixed contact; Has movable connector with the travelling contact of described fixed contact contact separation; When described travelling contact leaves, make at the electric arc of the contact that constitutes by described fixed contact and travelling contact and incide a plurality of muffler plates and block the arc-extinction device of back extinguishing arc a generation; And described electric arc from described contact to a pair of fixed engagement device one side that is directed to described arc-extinction device and movable connector one side electric arc guiding elements; It is characterized in that: in the described a pair of electric arc guiding elements, the electric arc running face of at least a portion of one side's electric arc guiding elements is a convex surface along the electric arc direct of travel, the electric arc running face of at least a portion relative with described convex surface of the opposing party's electric arc guiding elements is a concave surface along the electric arc direct of travel, and near the described contact of the muffler plate a described side's the electric arc guiding elements is bigger to the described muffler plate plate face direction composition of the electric arc incoming position of a side end face and the distance between the described fixed contact than the described contact of other muffler plates to the described muffler plate plate face direction composition of the electric arc incoming position of a side end face and the distance between the described fixed contact.
Description of drawings
Following brief description accompanying drawing.
Fig. 1 is a part that cuts the circuit breaker of the embodiment of the invention 1, the front view that expression is inner.
Fig. 2 is the stereogram that amplifies the movable connector one side electric arc guide 13 of the circuit breaker of representing embodiment 1.
Fig. 3 is the partial sectional view of the main portion of the electric arc movement when being used for the blocking action of circuit breaker of pattern ground expression embodiment 1.
Fig. 4 is a plane graph of observing the circuit breaker of embodiment 1 from movable connector one side electric arc guide.
Fig. 5 is a plane graph of observing the circuit breaker of embodiment 2 from movable connector one side electric arc guide.
Fig. 6 is the partial sectional view of major part of the circuit breaker of embodiment 3.
Fig. 7 is the partial sectional view of the circuit breaker of embodiment 4.
The partial sectional view of the electric arc movement when Fig. 8 is illustrate as a reference inapplicable of the present invention.
Fig. 9 is the front view of structure of fixed engagement device one side electric arc guide of the circuit breaker of embodiment 5.
The explanation of symbol.
The movable connector 1 of 1-; The 2-travelling contact; The 3-fixed contact; 4-fixed engagement device; The 5-switching mechanism; 10-fixed engagement device one side electric arc guide; 11,11a, 11b-muffler plate; 13, the movable connector one side electric arc guide of 16-; The 13a-extension; The 14-fixed engagement device one side first electric arc guide; The 15-fixed engagement device one side second electric arc guide; The 20-arc-extinction device; The 101-angled portion; The 104-slit.
Embodiment
Before the explanation specific embodiment, the ins and outs of the present invention are described.
In circuit breaker in the past, when smaller overload electric current interdicts, the electric arc that is accompanied by the contact disconnection and produces is all blocked by muffler plate, can produce high arc voltage, but when the big electric current of blocking short circuit current etc., arc voltage does not rise at once from the value of the muffler plate number expectation that is provided with, and breaking time is elongated, in the time of the poorest, can become and to interdict.Inventors of the present invention observe muffler plate at this moment, (for example the electric arc course is discontinuous to slow structure in the mobile phase with electric arc end, the structure that needs the change of current, or being the structure of convex surface along the cross section of the electric arc direct of travel of electric arc running face) muffler plate of a side do not have arc trace, and perhaps that the muffler plate of fast structure one side is compared arc trace is minimum with the mobile phase with electric arc end.In view of the above, to stagnate halfway be that electric arc integral body can't import the main cause in the arc-extinction device in the electric arc end that can infer the slow relatively side that advances.
It should be noted that, when the cross section along the electric arc direct of travel of electric arc running face is convex surface, compare when being plane or concave surface that can't pine for utilizing the heat of electric arc efficiently in adding of the travel section of following, so the heating spended time, translational speed is slack-off.
General in addition, in the electric arc of on a pair of sheet of advancing (electric arc guiding elements), advancing, partly to compare with arc column, the electric arc point is delayed driving, and arc column partly arrives arc-extinction device in advance.
Present inventors use transparent framework, electric arc mobile status during with the short circuit current blocking of high-speed camera observation circuit breaker in the past etc. during big electric current blocking, know: from contact to the electric arc of muffler plate high-speed mobile in the temporary transient situation about stagnating of muffler plate front surface; Making the electric arc of temporarily stagnating in the muffler plate front become the state of blocking by full muffler plate just is necessary to drive two electric arcs point before the arc column part; When the mobile difference of 2 electric arc points is significantly big, move the electric arc end of a fast side and block by muffler plate earlier, electric arc integral body for muffler plate with oblique in stable condition, the electric arc point stagnation of moving a slow side.
The stagnation of the arc column of described muffler plate front surface is speculated as: be the obstacle that muffler plate becomes mobile necessary some air-flow of electric arc, hinder air-flow and the electric arc translational speed that causes descends and causes; And be to need the time of heating muffler plate to cause for the bigger electric arc point that on muffler plate, forms the large-current electric arc.The number of muffler plate or configuration density are big more, and arc current is big more, and then stagnation is big more.
Therefore, present inventors are bigger to the plate face direction composition of the muffler plate of the electric arc incoming position of a side end face and the distance between the fixed contact than other muffler plate contacts to the plate face direction composition of the muffler plate of the electric arc incoming position of a side end face and the distance between the fixed contact by making mobile phase with electric arc promptly arrive the described contact of muffler plate of the slow side of arc-extinction device at electric arc to the muffler plate of a side of slow structure, when arc column when the front surface of muffler plate is temporarily stagnated, make and move slow electric arc point in advance, at first form the electric arc that blocks based on other muffler plates, then form at once based on the mobile phase of the electric arc end electric arc that blocks to the muffler plate of a slow side, the electric arc that generates based on whole muffler plates blocks state rapidly.
It should be noted that in this manual, the electric arc of the electric arc running face part of movable connector 1, fixed engagement device 4, electric arc guiding elements, muffler plate 11 etc. is called the electric arc point respectively, and near the part the electric arc point is called the electric arc end.In addition, comprise advancing and the change of current of electric arc, be called moving of electric arc.
Fig. 1～Fig. 4 is the figure that is used to illustrate the circuit breaker of the embodiment of the invention 1, more specifically, Fig. 1 cuts away the inner front view of part expression, Fig. 2 is the stereogram that amplifies the movable connector one side electric arc guide of expression, Fig. 3 is the partial sectional view of the major part of the electric arc movement when being used for the expression blocking action of pattern ground, and Fig. 4 is a plane graph of observing muffler plate from movable connector one side electric arc guide.
As shown in Figure 1, generally in this kind circuit breaker, be provided with in the framework 202 that is made of insulant: the terminal that is connected with external circuit is to 200,201 (201 is not shown); Fixed engagement device 4 with fixed contact 3; Have and be connected the travelling contact 2 that separates with fixed contact 3, form the right movable connector 1 of connectors with fixed engagement device 4; Drive the switching mechanism 5 of this movable connector 1; The response overcurrent makes described switching mechanism 5 work, the electromagnetic release device (plunger) 103 that described movable connector 1 is left; At described movable connector 1 (travelling contact 2) when leaving, make the contact that constitutes by fixed contact 3 and travelling contact 2 incide in a plurality of muffler plates 11 and block the arc-extinction device 20 of back extinguishing arc the electric arc of a generation; Make described electric arc be directed to a pair of fixed engagement device one side and the movable connector one side electric arc guide 10,13 of arc-extinction device 20 from connector 1,4; The exhaust outlet 203 of the high-temperature gas that eliminating produces along with the electric arc generation; The handle 7 that is used for the described switching mechanism 5 of manual operation.
On movable connector 1, fixing travelling contact 2, more becoming angled portion 101 by top one side (among the figure, one side of below) than travelling contact 2.But this movable connector 1 is electrically connected plunger 103 and movable connector one side electric arc guide 13 by moving-conductor 102.On this movable connector one side electric arc guide 13 as shown in Figure 2, be provided with (in other words to travelling contact 2 configuration side ends one side of the movable connector 1 of closure state, the contact 2 of closure state, 3 pairs one sides, or fixed contact 3 one sides) stretch out, have the extension 13a that makes the slit 104 that the part (for example travelling contact 2 configurations one side end) at least of movable connector 1 passes through along the track of the switch motion of movable connector 11 when travelling contact 2 leaves, the part of the movable connector 1 of the maximum open position in the blocking action is advanced in described slit 104 at least.
On fixed engagement device 4, fix the fixed contact 3 that travelling contact 2 contact is left, be provided with the electric arcs that extend to arc-extinction device 20 continuously with this fixed engagement device 4 sheet (fixed engagement device one side electric arc guide 10) of advancing.
It should be noted that travelling contact 2 or fixed contact 3 also can replace with the conductive member that constitutes movable connector 1 or fixed engagement device 4.
In the present embodiment, electric arc is made of movable connector one side electric arc guide 13 and angled portion 101, fixed engagement device one side electric arc guide 10 respectively from a pair of movable connector one side and the fixed engagement device one side electric arc guiding elements that 2,3 pairs of contacts are directed to arc-extinction device 20.
Arc-extinction device 20 keeps the extinguishing arc side plate 21 of muffler plate 11 to constitute by a plurality of flat muffler plates 11 with certain interval, and be configured to be clipped by an end of movable connector one side electric arc guide 13 and fixed engagement device one side electric arc guide 10 (movable connector one side electric arc guide 13 and fixed engagement device one side electric arc guide 10 and the end opposite side of each contact 2,3 configuration one side more exactly) from above-below direction.Be positioned at the contact 2 of the muffler plate 11a of movable connector one side electric arc guide 13 1 sides in a plurality of muffler plates 11, the position of 3 pairs one side end faces (more exactly, the back will use Fig. 4 to describe in detail, near but the contact 2 of the muffler plate 11a the movable connector one side electric arc guide 13, the electric arc incoming position of 3 pairs one side end faces) and the plate face direction of the muffler plate 11 of the distance between the fixed contact 3 (towards Fig. 3, left and right directions) composition is than the contact 2 of other muffler plates 11b, the position of 3 pairs one side end faces (more exactly, the back will use Fig. 4 to describe in detail, but the contact 2 of other muffler plates 11b, the electric arc incoming position of 3 pairs one side end faces) and the composition of the plate face direction of the muffler plate 11 of the distance between the fixed contact 3 big.In other words, in Fig. 3, the electric arc incoming position of 2,3 pairs of side end faces of contact of muffler plate 11a is than the electric arc incoming position of 2,3 pairs of side end faces of contact of other muffler plates 11b side that more keeps left.
In addition, exhaust outlet 203 be configured in arc-extinction device 20 the back side one side (in other words, arc-extinction device 20 with connector to the opposite side of a side is set).
Below, the action of the circuit breaker of present embodiment is described with reference to Fig. 3.When interdicting overcurrent with described circuit breaker, plunger 103 response overcurrent make switching mechanism 5 work, open 2,3 pairs of contacts.Be accompanied by this, between 2,3 pairs of contacts, produce electric arc (A1 among Fig. 3 represents the state of this electric arc).Electric arc between 2,3 pairs of this contacts is at first being advanced (A2 Fig. 3 represents this conditions at the arc) between the angled portion 101 on fixed engagement device one side electric arc guides 10 that extend continuously from fixed engagement device 4 and movable connector top.Then, the electric arc point that arrives angled portion 101 tops is to 13 changes of current of movable connector one side electric arc guide, carry out for this change of current is swift in motion, the extension 13a that stretches out and have the slit 104 that 2 configurations of travelling contact at least, one side end that makes movable connector 1 when travelling contact 2 leaves passes through to fixed contact 3 one sides is set on movable connector one side electric arc guide 13.In view of the above, can shorten described change of current required time.
The shortening of change of current time by these movable connector 1 one side electric arc points, reduced with advance sheet at simple rail shape on the fixed engagement device 4 one side electric arc points that move mobile poor, so electric arc is with the front surface of the state arrival muffler plate 11 of the plate face that is approximately perpendicular to flat muffler plate 11.
If the mobile difference of two electric arc points is significantly big, then under the state of movable connector one side electric arc point no show muffler plate 11, fixed engagement device 1 side electric arc point move in advance fixed engagement device one side electric arc guide 10 with ends fixed contact 3 opposite sides, electric arc is in stable condition what tilt for muffler plate 11, the stagnation of advancing of movable connector 1 side electric arc point.Under this state, can't block electric arc with whole muffler plates 11, so can't produce sufficient arc voltage, breaking time is elongated, the loss of explosion chamber 20 increases considerably, and when the poorest, become and can't interdict.
As mentioned above, in the present embodiment, by extension 13a being set at movable connector one side electric arc guide 13, shorten the change of current time of movable connector 1 one side electric arc points, reduce movable connector 11 1 side electric arc points than fixed engagement device 4 one delay that side electric arc point is late when arriving muffler plate 11.; movable connector 1 one side electric arc points need the change of current; and among the extension 13a; cross section along the electric arc direct of travel of electric arc running face is a convex surface; so be simple rail shape and at least a portion relative with the convex surface of extension 13a, be that the fixed engagement device 4 one side electric arc points of advancing on the sheet of advancing (fixed engagement device one side electric arc guide 10) of concave surface are compared along the cross section of the electric arc direct of travel of electric arc running face, arrive arc-extinction device 20 after all evening.
Therefore, in the present embodiment, the composition of the muffler plate 11 plate face directions of near the electric arc incoming position of 2, the 3 pairs of side end faces of contact of the muffler plate 11a the mobile phase with electric arc end promptly arrives the electric arc guiding elements (movable connector one side electric arc guide 13) of arc-extinction device 20 1 sides evening to the muffler plate 11a of a side of slow structure and the distance between the fixed contact 3 is bigger than the composition of the muffler plate 11 plate face directions of the electric arc incoming position of 2,3 pairs of side end faces of contact of other muffler plates 11b and the distance between the fixed contact 3.In view of the above, when at the arc column that in advance drives than electric arc point before this when the front surface of other muffler plates 11b is stagnated, mobile slow electric arc point is gone ahead of the rest (A3 among Fig. 3 represents the state of this electric arc), at first form and block electric arc (A4 among Fig. 3 represents the state of this electric arc) based on other muffler plates 11b, then form at once based on the block electric arc of the mobile phase with electric arc end to the muffler plate 11 of slow structure one side, the electric arc that produces based on whole muffler plates 11 blocks state (A5 among Fig. 3 represents the state of this electric arc) fast.
Like this, when when the front surface arc column of other muffler plates 11b is temporarily stagnated, fetch the mobile delay of movable connector 1 one side electric arc points, with the state that is approximately perpendicular to muffler plate 11 electric arc is imported arc-extinction device 20, then electric arc can not import muffler plate 11 sideling, and electric arc can be not get off for muffler plate 11 the in stable condition of inclination.
In addition, can electric arc based on blocking of muffler plate 11 be divided into based on other muffler plates 11b block and based near blocking of the muffler plate 11a the movable connector one side electric arc guide 13 etc. 2 times, count so can reduce once to block, have the effect that moves that to carry out more reliably to blocking electric arc.
As a result, can obtain high blocking performance rapidly in the whole importing of the electric arc arc-extinction device 20.
, in Fig. 3, represented electric arc with line to pattern, but in fact electric arc has certain cross section, arc current is big more, and the sectional area of this electric arc is just big more.In addition, muffler plate 11 is in order to promote the driving of electric arc, constitutes the tabular of otch with the shape of a hoof or wedge shape with magnetic (generally being iron).Therefore, the muffler plate 11 of present embodiment and temporarily be stuck in muffler plate 11 front surface arc column relation as shown in Figure 4.As can be seen from Figure 4, the electric arc incoming position of 2,3 pairs of side end faces of contact of muffler plate 11 is not the end face of 2,3 pairs of the most close contacts, it is the position (the figure, with dashed lines Lb represents) of moving the muffler plate 11 of the initial contact of arc column A that comes from contact 2,3 subtend muffler plate front surfaces.
In the present embodiment, as shown in Figure 4, near the movable connector one side electric arc guide 13 muffler plate 11a is by the part of 2,3 pairs of side ends of contact of cut-out muffler plate 11b, the electric arc incoming position that makes 2,3 pairs of side end faces of contact is (among the figure, shown in solid line La, when present embodiment, consistent with 2,3 pairs of side end faces of contact of the position of 2,3 pairs of the contacts that is positioned at the most close muffler plate 11a.) retreat (the muffler plate 11 plate face direction compositions of distance that are 3 of near the electric arc incoming position of 2,3 pairs of side end faces of contact of the muffler plate 11 the movable connector one side electric arc guide 13 and fixed contacts are bigger than the muffler plate 11 plate face direction compositions of the distance of 3 of the electric arc incoming position of 2,3 pairs of side end faces of contact of other muffler plates 11b and fixed contacts).
It should be noted that, in described embodiment, as shown in figures 1 and 3, being equivalent to be positioned at the having of muffler plate that electric arc arrives arc-extinction device 20 slow sides is that near the movable connector one side electric arc guide 13 of electric arc running face of convex surface muffler plate 11a are 2 along the cross section of electric arc direct of travel, other muffler plates 11b is 6, be not limited thereto, muffler plate 11a can be 1, also can be more than 3.
In addition, as Fig. 1, Fig. 3 and shown in Figure 4, the electric arc incoming position (with dashed lines La represents among Fig. 4) of two muffler plate 11a 2,3 pairs of side end faces of contact separately is identical, in other words, the muffler plate 11 plate face direction compositions of the electric arc incoming position of 2,3 pairs of side end faces of contact and the distance between the fixed contact 3 are identical.But be not limited thereto, also can described electric arc incoming position staggered for step-like along the convex surface of movable connector one side electric arc guide 13.
These are also not special the explanation in each following embodiment, but identical.
Fig. 5 is the figure that is used to illustrate the circuit breaker of the embodiment of the invention 2, more specifically, is the plane graph from movable connector one side electric arc guide unilateral observation muffler plate.
The circuit breaker of present embodiment is compared with the circuit breaker of embodiment 1,2, the 3 pairs one side end shape differences of contact of the muffler plate 11a the electric arc guiding elements of electric arc arrival arc-extinction device 20 slow sides near, and other structures are similarly to Example 1.Therefore, the point that main explanation below and embodiment 1 are different.
In the present embodiment, as shown in Figure 5, other muffler plates 11b is same with enforcement 1, constitute and have the tabular of wedge-formed incision, near the muffler plate 11a the movable connector one side electric arc guide 13 constitute and have the width bigger than the otch of other muffler plates 11b the tabular of horseshoe incision that (with the length of the direction of the driving direction quadrature of electric arc A) cut out.
In this structure, the contact 2 of muffler plate 11a, the electric arc incoming position of 3 pairs one side end faces shown in the dotted line La among Fig. 5, the contact 2 of the muffler plate 11b that can represent than with dashed lines Lb among Fig. 5, it (is the contact 2 of the muffler plate 11a the movable connector one side electric arc guide 13 near that the electric arc incoming position of 3 pairs one side end faces retreats, the electric arc incoming position of 3 pairs one side end faces and the muffler plate of the distance between the fixed contact 3 11 plate face direction compositions are than the contact 2 of other muffler plates 11b, the electric arc incoming position of 3 pairs one side end faces and the muffler plate of the distance between the fixed contact 3 11 plate face direction compositions are big).
In described embodiment 1, change in order to make the electric arc incoming position, the muffler plate 11a of movable connector one side electric arc guide 13 compares with other muffler plates 11b, and the position of 2,3 pairs of side end faces of contact of the position that is positioned at 2,3 pairs of the most close contacts is retreated.And in the present embodiment, in each muffler plate 11a and 11b, the position of 2,3 pairs of side end faces of contact of position that is positioned at 2,3 pairs of the most close contacts is identical, by making the shape difference of otch, the electric arc incoming position is changed.
When the big electric current of blocking short circuit current etc., produce the barometric gradient that arc heat causes, masterpiece based on this pressure differential is that big actuating force works, and muffler plate 11 magnetic saturation of magnetic, and the difference of the electromagnetic force of the driving electric arc that the shape difference of muffler plate 11 causes influences hardly., when the cut-off less current, the power of the driving electric arc that pressure differential causes is little, and electric arc is mainly driven by electromagnetic force.This electromagnetic force is mainly produced by the effect of muffler plate 11 magnetics such as grade.Therefore, compare than the embodiment 1 that the same endface position of muffler plate 11b retreats with the position of 2,3 pairs of side end faces of contact of the position of 2,3 pairs of the most close contacts that is positioned at muffler plate 11a, in the present embodiment that does not make it to retreat, the electric current of pressing the magnetic that constitutes muffler plate 11a attracts the part of effect increase, drives the electromagnetic force increase of electric arc.
As mentioned above, identical with embodiment 1 except obtaining the effect same with described embodiment 1 in the present embodiment, the electromagnetic force of the driving electric arc when rated current blocking or smaller overload blocking increases, and can shorten breaking time.
(embodiment 3)
Fig. 6 is the Fig. 3 that is used to illustrate the embodiment of the invention 3, more specifically, is the partial sectional view of major part.
The circuit breaker of present embodiment is compared with the circuit breaker of embodiment 1, the structure difference of movable connector one side electric arc guiding elements, and other structures are similarly to Example 1.Therefore, the point that main explanation below and embodiment 1 are different.
In embodiment 1, in order to shorten from the angled portion 101 of the electric arc point of movable connector 1 one sides change of current required time to movable connector one side electric arc guide 13, the extension 13a that stretches out and have the slit 104 that the part that makes movable connector 1 when travelling contact 2 leaves passes through to fixed contact 3 one sides is set on movable connector one side electric arc guide 13, but in the present embodiment, make angled portion 101 to movable connector one side electric arc guide 13 1 lateral bending songs.
In such structure, can be configured to when travelling contact 2 leaves, make the top ends of angled portion 101 near movable connector one side electric arc guide 13, so it is same during with embodiment 1, can shorten the time of the electric arc point on arrival angled portion 101 tops to 13 changes of current of movable connector one side electric arc guide, the shortening of change of current time by these movable connector 1 one side electric arc points, reduce with advance sheet at simple rail shape on the fixed engagement device 4 one side electric arc points that move mobile poor.
Like this, in the present embodiment, by making angled portion 101 to movable connector one side electric arc guide 13 1 lateral bending songs, shorten the change of current time of movable connector 1 one side electric arc points, reduce movable connector 1 one side electric arc points than fixed engagement device 4 one delay that side electric arc point is late when arriving muffler plate 11.; movable connector 1 one side electric arc points are necessary the change of current; and in the bend of angled portion 101; cross section along the electric arc direct of travel of electric arc running face is a convex surface; so with being that the sheet of advancing (fixed engagement device one side electric arc guide 10) simple rail shape and at least a portion relative with the convex surface of extension 13a, that be concave surface is gone up the fixed engagement device 4 one side electric arc points that move and compared along the cross section of the electric arc direct of travel of electric arc running face, arrive arc-extinction device 20 after all evening.
Therefore, in the present embodiment, similarly to Example 1, is the contact 2 that electric arc arrives near the muffler plate 11a the electric arc guiding elements (movable connector one side electric arc guide 13) of the slow side of arc-extinction device 20 by making mobile phase with electric arc end to the muffler plate 11a of slow structure one side, the electric arc incoming position of 3 pairs one side end faces and the muffler plate of the distance between the fixed contact 3 11 plate face direction compositions are than the contact 2 of other muffler plates 11b, the electric arc incoming position of 3 pairs one side end faces and the muffler plate of the distance between the fixed contact 3 11 plate face direction compositions are big, when the arc column that in advance drives than electric arc point before this when the front surface of muffler plate 11 is stagnated, make and move slow electric arc point in advance, at first form the electric arc that blocks based on other muffler plates 11b, then form at once based on the block electric arc of the mobile phase with electric arc end to the muffler plate 11a of slow structure one side, the electric arc that produces based on whole muffler plates 11 blocks state fast.
In the present embodiment, similarly to Example 1, can when the blocking of big electric currents such as short circuit current, also, obtain circuit breaker with high barrier property energy fast in the whole importing rapidly of the electric arc arc-extinction device.
Fig. 7 and Fig. 8 are the figure that is used to illustrate the circuit breaker of the embodiment of the invention 4, and more specifically, Fig. 7 is a partial sectional view, and Fig. 8 is as the partial sectional view with reference to the movement of the inapplicable electric arc when of the present invention of explanation.
In the circuit breaker of present embodiment, different with the circuit breaker of described each embodiment, the position relation of movable connector 1 and fixed engagement device 4 is put upside down, movable connector one side electric arc guide 13 response overcurrent, towards Fig. 7, by going out actuation part 300, switching mechanism 5 is started working from left to right, movable connector 1 (travelling contact 2) is opened.
Configuration J word shape electric arc guide (is equivalent to the fixed engagement device one side first electric arc guide continuously on the top of the fixed engagement device 4 of J word shape.) 14, become the shape of nearly U word shape by fixed engagement device 4 and J word shape electric arc guide.J word shape electric arc guide 14 with the relative position of anti-fixed engagement device one side end (with the end of the opposite side of fixed engagement device one side), dispose with conductor and be connected with fixed engagement device 4 and an end extends to the fixed engagement device one side second electric arc guide 15 on the top of arc-extinction device 20.In the present embodiment, constitute the fixed engagement device one side electric arc guiding elements of electric arc by fixed engagement device one side, first electric arc guide 14 and the fixed engagement device one side second electric arc guide 15 from 20 guiding of contact 2,3 subtend arc-extinction devices.
And angled portion 101 is set continuously in the top ends of movable connector 1, be connected with movable connector 1 with conductor and an end extends to the movable connector one side electric arc guide 16 of the bottom of arc-extinction device 20 in the position configuration relative with the end of this angled portion 101.In the present embodiment, constitute the movable connector one side electric arc guiding elements that electric arc is directed to arc-extinction device 20 from 2,3 pairs of contacts by angled portion 101 and movable connector one side electric arc guide 16.
In such structure, when overcurrent such as blocking short circuit current, plunger 103 response overcurrent make switching mechanism 5 work, 2,3 pairs of disconnections of contact.Be accompanied by this, produce electric arc (A1 among Fig. 7 represents this conditions at the arc) between 2,3 pairs of contacts.Electric arc between 2,3 pairs of this contacts at first advances between the angled portion 101 and J word shape electric arc guide 14 of extending continuously from movable connector 1.Then, arrive the electric arc point on angled portion 101 tops to the movable connector relative one side electric arc guide, 16 changes of current (A2 among Fig. 7 represents this conditions at the arc) with angled portion 101 top ends.Therefore, electric arc is advanced between movable connector one side electric arc guide 16 and J word shape electric arc guide 14.At this moment, the cross section along the electric arc direct of travel of electric arc running face of J word shape electric arc guide 14 is convex surfaces, so the electric arc point electric arc point of J word shape electric arc guide 14 1 sides and at least a portion relative with the convex surface of described J word shape electric arc guide 14, that along the cross section of the electric arc direct of travel of its electric arc running face be the movable connector one side electric arc guide 16 of concave surface is compared, electric arc moves slowly (A3 among Fig. 7 represents this conditions at the arc).
Therefore, in the present embodiment, the muffler plate 11a that is positioned at first, second electric arc guide 14,15 of fixed engagement device one side is that the muffler plate 11 plate face direction compositions of the electric arc incoming position of electric arc 2,3 pairs of side end faces of contact of arriving near the muffler plate 11a the electric arc guiding elements (first, second electric arc guide 14,15 of fixed engagement device one side) of arc-extinction device 20 slow sides and the distance between the fixed contact 3 are bigger than the muffler plate 11 plate face direction compositions of the electric arc incoming position of 2,3 pairs of side end faces of contact of other muffler plates 11b and the distance between the fixed contact 3.
In view of the above, when at the arc column that in advance drives than electric arc point before this when the front surface of other muffler plates 11b is temporarily stagnated, the electric arc point of movable connector one side electric arc guide 16 is gone ahead of the rest for arc column, at first form and block electric arc (A4 among Fig. 7 represents the state of this electric arc) based on other muffler plates 11b, then form the electric arc that blocks based on the muffler plate 11a of J word shape electric arc guide 14 (side with the slow relatively structure of advancing of electric arc end) at once, the electric arc that produces based on whole muffler plates 11 blocks state (A5 among Fig. 7 represents the state of this electric arc) fast.
Like this, when when the front surface arc column of other muffler plates 11b is temporarily stagnated, fetch the delay of advancing of fixed engagement device 4 one side electric arc points, state with the plate face that is approximately perpendicular to muffler plate 11 imports arc-extinction device 20 to electric arc, then electric arc can not import muffler plate 11 sideling, electric arc can not resemble shown in the A3 among Fig. 8, with in stable conditionly getting off of tilting for muffler plate 11.
In addition, can electric arc based on blocking of muffler plate 11 be divided into based on other muffler plates 11b block and based near blocking of the muffler plate 11a the fixed engagement device one side electric arc guide 13 etc. 2 times, so can reduce blocking and count once, have the effect that to carry out more reliably to the transfer of blocking electric arc.
As a result, can obtain high blocking performance rapidly in the whole importing of the electric arc arc-extinction device 20.
Fig. 9 is the figure that is used to illustrate the circuit breaker of the embodiment of the invention 5, more specifically, is the front view of the structure of expression fixed engagement device one side electric arc guide.
In described embodiment 4, as shown in Figure 7, the fixed engagement device one side second electric arc guide 15 that is extended to the top of arc-extinction device 20 by J word shape electric arc guide 14 (resembling the rain of shells fixed engagement device one side first electric arc guide) 14 and end constitutes, but, as shown in Figure 9, also can be the structure of fixed engagement device 4, fixed engagement device one side, the first electric arc guide 14 and the fixed engagement device one side second electric arc guide 15 continuous one.
According to such structure, except obtaining the effect same with described embodiment 4, electric arc point moves no longer necessity from the fixed engagement device one side first electric arc guide 14 to the discontinuous of the fixed engagement device one side second electric arc guide 15, is the effect that moves of fixed engagement device 4 one side electric arc points to slow structure so also can obtain the mobile phase that can further improve the electric arc end.
It should be noted that, in described each embodiment, illustrated in a pair of electric arc guiding elements, at least a portion of one side's electric arc guiding elements, cross section along the electric arc direct of travel of its electric arc running face is a convex surface, at least a portion relative of the opposing party's electric arc guiding elements with described convex surface, when the cross section of the electric arc direct of travel of its electric arc running face is concave surface, contact with near the muffler plate 11a the electric arc guiding elements of described convex surface is to the muffler plate 11 plate face direction compositions of the electric arc incoming position of an end face and the distance between the fixed contact 3 contact 2 than other muffler plates 11b, the electric arc incoming position of 3 pairs one side end faces and the big example of the muffler plate of the distance between the fixed contact 3 11 plate face direction compositions, but when there not being described convex surface also to carry out the change of current, or the length of electric arc course is not simultaneously, sometimes the mobile phase of mobile and the opposing party's of a side electric arc end electric arc end is slower than relative, and it is slow to arrive arc-extinction device 20.The present invention also can be applied to this situation, to arrive the contact of muffler plate of the slow side of arc-extinction device at electric arc bigger to the muffler plate plate face direction composition of the electric arc incoming position of a side end face and the distance between the fixed contact than the contact of other muffler plates to the muffler plate plate face direction composition of the electric arc incoming position of a side end face and the distance between the fixed contact by making, with illustrate among described each embodiment same, when the blocking of big electric currents such as short circuit current, also can obtain circuit breaker in the whole importing rapidly of the electric arc arc-extinction device with high blocking performance.
Like this, according to the present invention, circuit breaker comprises: the fixed engagement device with fixed contact; Has movable connector with the travelling contact of described fixed contact contact separation; When described travelling contact leaves, make at the electric arc of the contact that constitutes by described fixed contact and travelling contact and incide a plurality of muffler plates and block the arc-extinction device of back extinguishing arc a generation; And described electric arc from described contact to a pair of fixed engagement device one side that is directed to described arc-extinction device and movable connector one side electric arc guiding elements; The described contact of muffler plate that arrives the slow side of described arc-extinction device at electric arc is bigger to the plate face direction composition of the described muffler plate of the electric arc incoming position of a side end face and the distance between the described fixed contact than the described contact of other muffler plates to the plate face direction composition of the described muffler plate of the electric arc incoming position of a side end face and the distance between the described fixed contact.Therefore, when the blocking of big electric currents such as short circuit current, also can obtain circuit breaker in the whole importing rapidly of the electric arc arc-extinction device with high blocking performance.
In addition, circuit breaker comprises: the fixed engagement device with fixed contact; Has movable connector with the travelling contact of described fixed contact contact separation; When described travelling contact leaves, make at the electric arc of the contact that constitutes by described fixed contact and travelling contact and incide a plurality of muffler plates and block the arc-extinction device of back extinguishing arc a generation; And described electric arc from described contact to a pair of fixed engagement device that is directed to described arc-extinction device and movable connector one side electric arc guiding elements; It is characterized in that: in the described a pair of electric arc guiding elements, at least a portion of one side's electric arc guiding elements, cross section along the electric arc direct of travel of electric arc running face is a convex surface, at least a portion relative of the opposing party's electric arc guiding elements with described convex surface, cross section along the electric arc direct of travel of electric arc running face is a concave surface, and near the described contact of the muffler plate a described side's the electric arc guiding elements is bigger to the described muffler plate plate face direction composition of the electric arc incoming position of a side end face and the distance between the described fixed contact than the described contact of other muffler plates to the described muffler plate plate face direction composition of the electric arc incoming position of a side end face and the distance between the described fixed contact.Therefore, when the blocking of big electric currents such as short circuit current, also can obtain circuit breaker in the whole importing rapidly of the electric arc arc-extinction device with high blocking performance.
Claims (5)
1. a circuit breaker comprises: the fixed engagement device (4) with fixed contact (3); Has movable connector (1) with the travelling contact (2) of described fixed contact (3) contact separation; , make at the electric arc of the contact that constitutes by described fixed contact (3) and travelling contact (2) and incide a plurality of muffler plates (11) and block the arc-extinction device (20) of back extinguishing arc when leaving at described travelling contact (2) a generation; And described electric arc from described contact to a pair of fixed engagement device one side that is directed to described arc-extinction device (20) and movable connector one side electric arc guiding elements (10,13,101,14,15,16); It is characterized in that:
The described contact that is positioned on the muffler plate (11a) that electric arc arrives the slow side of described arc-extinction device (20) is bigger to the plate face direction composition of the described muffler plate (11) of the electric arc incoming position of a side end face and the distance between the described fixed contact (3) than the described contact on other muffler plates (11b) to the plate face direction composition of the described muffler plate (11) of the electric arc incoming position of a side end face and the distance between the described fixed contact (3).
2. a circuit breaker comprises: the fixed engagement device (4) with fixed contact (3); Has movable connector (1) with the travelling contact (2) of described fixed contact (3) contact separation; , make at the electric arc of the contact that constitutes by described fixed contact (3) and travelling contact (2) and incide a plurality of muffler plates (11) and block the arc-extinction device (20) of back extinguishing arc when leaving at described travelling contact (2) a generation; And described electric arc from described contact to a pair of fixed engagement device that is directed to described arc-extinction device (20) and movable connector one side electric arc guiding elements (10,13,101,14,15,16); It is characterized in that:
In the described a pair of electric arc guiding elements, the electric arc running face of at least a portion of one side's electric arc guiding elements is a convex surface along the electric arc direct of travel, the electric arc running face of at least a portion relative with described convex surface of the opposing party's electric arc guiding elements is a concave surface along the electric arc direct of travel, and the described contact near the muffler plate (11a) a described side's the electric arc guiding elements is bigger to described muffler plate (11) the plate face direction composition of the electric arc incoming position of a side end face and the distance between the described fixed contact (3) than the described contact on other muffler plates (11b) to described muffler plate (11) the plate face direction composition of the electric arc incoming position of a side end face and the distance between the described fixed contact (3).
3. circuit breaker according to claim 1 and 2 is characterized in that:
Described movable connector one side electric arc guiding elements (13,101) is provided with electric arc from angled portion (101) and the movable connector one side electric arc guide (13) of described connector to the described movable connector (1) that is directed to arc-extinction device (20); On described movable connector one side electric arc guide (13), be provided with stretch out to described fixed contact (3) one sides, have an extension (13a) that makes the slit (104) that the part of described movable connector (1) passes through at described travelling contact (2) when leaving.
4. circuit breaker according to claim 1 and 2 is characterized in that:
Described movable connector one side electric arc guiding elements (13,101) is provided with electric arc from angled portion (101) and the movable connector one side electric arc guide (13) of described connector to the described movable connector (1) that is directed to arc-extinction device (20); And the angled portion (101) that makes described movable connector (1) is to described movable connector one side electric arc guide (13) bending, thereby makes top ends in the described angled portion (101) of described travelling contact (2) when leaving near described movable connector one side electric arc guide (13).
5. circuit breaker according to claim 1 and 2 is characterized in that:
Be arranged in described muffler plate (11a) and other muffler plates (11b) that electric arc arrives the slow side of described arc-extinction device (20), be positioned at from described contact all identical to the position of a side end face at described two muffler plates (11a, 11b) to the contact of nearest position, by making the kerf difference that is provided with respectively, the electric arc incoming position is changed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP061336/2003 | 2003-03-07 | ||
| JP2003061336A JP2004273235A (en) | 2003-03-07 | 2003-03-07 | Circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1527334A CN1527334A (en) | 2004-09-08 |
| CN100337289C true CN100337289C (en) | 2007-09-12 |
Family
ID=33123586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101203876A Expired - Fee Related CN100337289C (en) | 2003-03-07 | 2003-12-11 | Electric circuit breaker |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2004273235A (en) |
| CN (1) | CN100337289C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4637722B2 (en) * | 2005-11-08 | 2011-02-23 | 三菱電機株式会社 | Circuit breaker |
| JP5121608B2 (en) * | 2008-07-09 | 2013-01-16 | 三菱電機株式会社 | Circuit breaker |
| JP5093158B2 (en) * | 2009-03-09 | 2012-12-05 | 富士電機機器制御株式会社 | Circuit breaker |
| JP5287629B2 (en) * | 2009-09-16 | 2013-09-11 | 三菱電機株式会社 | Circuit breaker |
| US8822866B2 (en) | 2010-04-19 | 2014-09-02 | Carling Technologies, Inc. | Circuit interrupter with enhanced arc quenching capabilities |
| CN106298394B (en) * | 2016-08-30 | 2019-02-15 | 安徽中电兴发与鑫龙科技股份有限公司 | A kind of low-voltage circuit breaker structure |
| KR102666105B1 (en) * | 2021-05-11 | 2024-05-16 | 엘에스일렉트릭(주) | Circuit breaker part and air circuit breaker include the same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1304149A (en) * | 2000-01-07 | 2001-07-18 | 施耐德电器工业公司 | Electric breaker electrode arranged with arc chutes with dieelectric shield |
-
2003
- 2003-03-07 JP JP2003061336A patent/JP2004273235A/en active Pending
- 2003-12-11 CN CNB2003101203876A patent/CN100337289C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1304149A (en) * | 2000-01-07 | 2001-07-18 | 施耐德电器工业公司 | Electric breaker electrode arranged with arc chutes with dieelectric shield |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004273235A (en) | 2004-09-30 |
| CN1527334A (en) | 2004-09-08 |
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