CN1189912C - Circuit breaker - Google Patents
Circuit breaker Download PDFInfo
- Publication number
- CN1189912C CN1189912C CNB01124383XA CN01124383A CN1189912C CN 1189912 C CN1189912 C CN 1189912C CN B01124383X A CNB01124383X A CN B01124383XA CN 01124383 A CN01124383 A CN 01124383A CN 1189912 C CN1189912 C CN 1189912C
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- China
- Prior art keywords
- mentioned
- rocking arm
- arresting lever
- circuit
- contact
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Abstract
The circuit breaker comprises a fixed contactor 23 that is installed in the insulating box 20, a movable contactor 25 that contacts and separates opposed to this fixed contactor, an opening and shutting mechanism 300 having an arm 26 and a latch 32 for driving this movable contactor, a stopper 21a that determines the maximum separation position of the movable contactor, and an electromagnetic tripping part 34 having a plunger 36 that responds to the over current and operates the opening and shutting mechanism. When the over current is made to flow and the movable contactor is separated, and the arm collides with the stopper, the rebounding of the arm 26 is stopped via the latch 32, that is engaged with the plunger 36 of which is suctioned and maintained by the arc current. As a result, the staying time of arc generated between the contact points is made short and failure of cut-off is less likely to occur, and wear and tear of the movable contact point and the fixed contact point is little.
Description
Technical field
The present invention relates to circuit-breaker, relate in particular to and when cutting off the overcurrent that flows into circuit, can make contact dead circuit circuit breaker improvement reliably.
Background technology
Usually, circuit-breaker as in circuit, there being the fault current that is called short circuit current to become overcurrent and when flowing through circuit with circuitry cuts, thereby it is by with the overcurrent in the open circuit that flows into this circuit-breaker magnet being started the contact disengagement to be opened circuit.In the sort circuit circuit breaker, be provided with arc-extinction device,, avoid elongate breaking time in order to eliminate the electric arc that when contact is thrown off, is produced.
As traditional circuit-breaker, the circuit-breaker shown in for example shown in Figure 5, the Japanese patent laid-open 10-172409 communique (below be referred to as " conventional apparatus ") is arranged.Insulation framework 20 in this conventional apparatus is that base 21 and the lid 22 made by the synthetic resin material constitute.The movable contact 25 that in open circuit, is provided with fixed contact 23, is fixed on the fixed contact 24 on the fixed contact 23 and has the armature contact 25a that contacts, throws off facing to this fixed contact.26 for supporting the rocking arm of this armature contact 25 integratedly, and the slotted hole 26c that it is fixed the 26b of portion and is supplied following axle 27 to engage by U font ditch 26a, block constitute.
The 27th, become the axle of the center of rotation of rocking arm 26 and movable contact 25, it is supported on the insulation framework.The 28th, to the main spring of movable contact 25 to the direction reinforcing of throwing off fixed contact 24, the 29th, the handle of making by synthetic resin, carry out opening and closing operations from the outside, the 30th, with the back-moving spring of handle 29 to the counter clockwise direction reinforcing, the 31st, bend to the operator link that forms behind the U font by circular bar, the one end engages with handle 29, and the other end engages ditch 32a engaging with the connecting rod of following arresting lever 32.In addition, handle 29 is to be made of with the protuberance 29c that is connected with operator link 31 the handshake part 29b that protrudes in outside the insulation framework 20.
The 32nd, the arresting lever of axle on 27, it is engage the sneek sheet 32b of pressing force of bar 37 of ditch 32a, the following electromagnetism trip portion 34 of acceptance and the sneek sheet 32c that bears the power of the direction that engaging that the pressing force that bending produced because of following bimetallic lever 33 makes operator link 31 engage ditch 32 with connecting rod unclamps constitutes by the connecting rod that the other end with operator link 31 fastens.In addition, compression is provided with back-moving spring 32d between rocking arm 26 and arresting lever 32, it all the time with 32 pairs of rocking arms 26 of arresting lever to the counter-clockwise direction reinforcing.The above-mentioned other end that embeds the operator link 31 of U font ditch 26a is clamped in because of the elastic force of spring 32d among the connecting rod engaging ditch 32a of arresting lever 32 becomes lock-out state.In addition, armature contact 25a makes Elastic Contact to fixed contact 24, forms open circuit (state of Fig. 5).
Like this, constitute switching mechanism by above-mentioned rocking arm 26, main spring 28, handle 29, back-moving spring 30, operator link 31 and arresting lever 32.
The 33rd, corresponding with electrical current, in Fig. 5 to the crooked bimetal piece of right heating, the 34th, electromagnetic trip device, it has the power-actuated plunger 36 of electromagnetism that is produced by magnet 35 energising, and because of the attraction action of this plunger 36 outstanding bar 37 of direction left in Fig. 5.Above-mentioned bimetal piece 33 and electromagnetic trip device 34 constitute over current trip.The 38th, arc-extinction device, the 39th, the muffler plate of this arc-extinction device 38.The 40th, include the electric arc generation chamber of said fixing contact 24 and armature contact 25, be full of the electric arc that produces when movable contact 25 is thrown off.The 41st, electric arc is guided into the electric arc guide plate of arc-extinction device 38 directions.
In case have short circuit current to flow into circuit in the circuit-breaker of this structure, the magnet 35 of electromagnetic trip device 34 is promptly experienced it and moved, and attracts plunger 36, coupled moving bar 37 just moves to left.So sneek sheet 32b is pushed by bar 37, arresting lever 32 overcomes the spring force of back-moving spring 32d and rotates to clockwise direction.32a is embedded in the other end that becomes the operator link 31 of locking state in the U font ditch 26a because of connecting rod engaging ditch, because arresting lever 32 rotates and becomes free state with respect to rocking arm to clockwise direction.Therefore, rocking arm 26 is because of being that the center is rotated to clockwise direction forcibly and done tripping operation and move (disengagement) as the elastic force of the main spring 28 of release mechanism with axle 27.Like this, movable contact 25 is thrown off fast and is done to cut off and move.
, in above-mentioned conventional apparatus, flow into circuit and when switching mechanism was opened, rocking arm 26 sharply moved because of the elastic force of main spring 28, so can hit on block 42 also pop into position at big electric current such as short circuit current.Because the action of the rocking arm 26 that rebounds is not subjected to arresting lever 32 constraints, thus irrelevant with arresting lever 32, till the front end of the bar 37 that always rebounds.At this moment, the throw-off distances of armature contact 25a and fixed contact 24 shortens, and returns between movable contact 25 and the fixed contact 23 to the electric arc that explosion chamber's 38 directions move, and electric arc is detained between armature contact 25a and fixed contact 24 easily.
Therefore there are the prolongation of electric arc residence time, prolongation breaking time, the easy bad problem that opens circuit.
In addition, since the prolongation of electric arc residence time, the loss that also can increase armature contact 25a and fixed contact 24.
Summary of the invention
The present invention is in order to address the above problem, its purpose is to provide following circuit-breaker, resistance electric arc knock-ons the throw-off distances between contact is remained on more than the set-point when moving by the overcurrent trip at circuit-breaker, shorten the residence time of the electric arc that between the contact, takes place with this, to realize reliably opening circuit the loss of take in sail simultaneously contact and fixed contact.
In order to achieve the above object, circuit-breaker of the present invention is provided with electromagnetic trip device and has: the insulation framework; Be loaded on the fixed contact in this framework; Movable contact facing to this fixed contact contact, disengagement; Have the rocking arm of this movable contact of driving and the switching mechanism of arresting lever; Be located at the insulation framework, determine the block of the maximum disengaged position of movable contact with the rocking arm butt; Have under overcurrent the arresting lever that starts and make switching mechanism and move to the electromagnetic trip device of the plunger of trip position, its characteristics are: plunger and arresting lever have the holding section of mutual engaging usefulness, these holding sections start at electromagnetic trip device, switching mechanism makes movable contact throw off, also engage mutually when rocking arm knocks block, during plunger remains on operating position, arresting lever is remained on the trip position; rocking arm is provided with block with the arresting lever butt portion that is fixed, and prevents that thus movable contact from knock-oning to make position.
Description of drawings
Fig. 1 cuts the part of the circuit-breaker of the present invention's one example to represent the front view of its internal structure open, and the indication circuit circuit breaker is in closed circuit state.
Fig. 2 is the front view of the circuit-breaker of presentation graphs 1 when being in open-circuit condition.
Fig. 3 is the front view of tripping operation action initial condition of the circuit-breaker of presentation graphs 1.
Fig. 4 is the front view that the circuit-breaker of presentation graphs 1 is made the state of tripping operation action and constraint switching mechanism.
Fig. 5 is partly cut-away's front view of expression conventional electric circuit breakers.
Embodiment
Below, describe the present invention according to Fig. 1 in detail to an example shown in Figure 4.Adopt identical label, and omit its explanation for the parts identical or suitable, part with conventional electric circuit breakers shown in Figure 5.
Fig. 1 cuts the part of the circuit-breaker of an example of the present invention to represent the front view of its internal structure open, and its indication circuit circuit breaker is in closed circuit state.Fig. 2 is the front view of the circuit-breaker of presentation graphs 1 when being in open-circuit condition.Fig. 3 is the front view of tripping operation action initial condition of the circuit-breaker of presentation graphs 1.Fig. 4 is the front view that the circuit-breaker of presentation graphs 1 is made the state of tripping operation action and constraint switching mechanism.
In Fig. 1, circuit-breaker has the insulation framework 20 that is constituted, made with the synthetic resin material by base 21 and lid 22.Fixed contact 23 is equipped with in inside in insulation framework 20, is fixed with fixed contact 24 on this fixed contact 23.In addition, also be provided with movable contact 25, this movable contact 25 has the armature contact 25a facing to 24 contacts of this fixed contact, disengagement, and this movable contact 25 is supported integratedly by movable contact bearing 25H.
In insulation framework 20, also flatly be provided with rocking arm 26 substantially by axle 27.End bearing at rocking arm 26 has movable contact bearing 25H, and forms U font ditch 26a at the other end of rocking arm 26, as the first engaging ditch that can freely engage, disengageably accommodate operator link 31 other ends.On rocking arm 26, also for example be bent to form the block 26b of portion that is fixed by pressure processing, this block be fixed the 26b of portion and following arresting lever 32 butts and with the block 21a butt of being located on the base 21.Compression is provided with main spring 28 between rocking arm 26 and insulation framework 20,, make it to rotate to clockwise direction all the time to rocking arm 26 reinforcings with the elastic force of main spring 28, thereby with armature contact 25 all the time to the direction reinforcing that breaks away from fixed contact 24.Owing to the be fixed 26b of portion and block 21a of the afterburning block that rotates of this rotation connects, thereby the maximum rotation angle position of qualification rocking arm 26, be the maximum disengaged position of movable contact 25.In addition, rocking arm 26 and movable contact 25 are that pivot rotates with the axle 27 that is supported on the insulation framework 20.
Circuit-breaker also has the handle of being made by synthetic resin, carry out opening and closing operations from the outside 29, and this handle 29 is by base portion 29a, be projected into the handshake part 29b outside the insulation framework 20 and the protuberance 29c that is connected with following operator link 31 is constituted from this base portion 29a.For handle 29 is suppressed to counter clockwise direction and be provided with back-moving spring 30.Operator link 31 is to form after bending to the U font by circular bar, and the one end engages with the protuberance 29c of handle 29, and the other end is accommodated and remained on U font ditch 26a and as among the connecting rod engaging ditch 32a that is formed at second on the following arresting lever 32 engaging ditch.
On the other hand, arresting lever 32 is also by axle 27 and rocking arm 26 coaxial supportings, on the one end, be provided with holding section 32b, the plunger 36 of the electromagnetic trip device 34 that is attracted with starting under overcurrent engages, and on its other end, be provided with connecting rod engaging ditch 32a, be used for keeping being contained in the other end of the operator link 31 of U font ditch 26a.Be fixed between the 26b of portion at the other end of arresting lever 32 with at the block of rocking arm 26 other ends, when common state as shown in Figure 1, there is small gap each other, arresting lever 32 turns to the position that connects with block fixed part 26b when the initial actuating that has overcurrent to flow through, and operator link 31 is freed from connecting rod engaging ditch 32a.
On the other hand, near electromagnetic trip device 34, be provided with corresponding with electrical current and in Fig. 1 left direction add the bimetal piece 33 of thermal flexure.It is that counterclockwise rotate at the center with axle 43 that the formed pressing force of the flexural deformation of bimetal piece 33 makes connecting rod 42, and sneek sheet 32c bears the power that operator link 31 is engaged the direction that the engaging of ditch 32a unclamps with connecting rod.In addition, constitute switching mechanism by movable contact bearing 25H, rocking arm 26, main spring 28, handle 29, back-moving spring 30, operator link 31 and arresting lever 32.
In case when make position shown in Figure 1, have overcurrent to flow into electromagnetic trip device 34, at initial time, plunger 36 as shown in Figure 3, direction moves left.The holding section 32b butt of the jut 36a of plunger 36 and arresting lever 32 and to make arresting lever 32 be that the center clockwise direction rotates with axle 27.Because the rotation of arresting lever 32, the rocking arm 26 that the operator link 31 that embeds U font ditch 26a is retrained frees because of the connecting rod engaging ditch 32a as the arresting lever 32 of lock uint throws off from the restraining force of operator link 31 from operator link 31, and because of the elastic force of main spring 28 be center clockwise direction rotation with axle 27.At this moment, also added the absorbability from plunger 36 in the elastic force of main spring 28, rocking arm 26 rotates (Fig. 4) under the block of arresting lever 32 and rocking arm 26 is fixed the state of the 26b of portion butt.
In addition, because movable contact bearing 25H and rocking arm 26 rotate integratedly, as shown in Figure 4, movable contact 25 breaks away from from fixed contact 23.At this moment, between armature contact 25 and fixed contact 23, produce electric arc.In addition, this moment is because rocking arm 26 be that rotate to clockwise direction apace at the center with axle 27, and 26b of portion and block 21a collide so block is fixed, and counterclockwise rotates for middle mind-set with axle 27 because of its rebound effect.
Yet rocking arm 26 contacts with arresting lever 32 at block fixed part 26b place, and produces electric arc between movable contact 25 and fixed contact 23, and because of the arcing electrically conducting.Therefore, continue to have electric current to flow through on electromagnet 35, plunger 36 is attracted by electromagnet and continues to remain on the operating position.On the other hand, because the holding section 32b of the jut 36a of plunger 36 and arresting lever 32 keeps fastening state,, and stop rocking arm 26 to counterclockwise rotating so plunger 36 has stoped arresting lever 34 to rotation counterclockwise.After circuitry cuts, as shown in Figure 2, block be fixed the 26b of portion because of the elastic force of main spring 28 by being pressed on the block 21a, the end of opening circuit.
In addition, in the occasion that circuit-breaker is resetted, promptly get back to once more make position, as shown in Figure 2, counterclockwise forward handle 29 to make position, the other end of operator link 31 is contained among the connecting rod engaging ditch 32a of the U font ditch 26a of rocking arm 26 and arresting lever 32.At this moment, operator link 31 overcomes the deadweight of arresting lever 32 and connecting rod is engaged ditch 32a to be pushed open, thereby accommodates among the U font ditch 26a.In case accommodate into, use rocking arm 26 and arresting lever 32 because of the deadweight of arresting lever 32 once more the other end of operator link 31 is caught, making becomes the state that can not extract.As the elastic force that under this state, overcomes back-moving spring 30 handle 29 is rotated to clockwise direction forcibly, just can make it to reset to common user mode as shown in Figure 1 to form make position for use.
Like this, if adopt circuit-breaker of the present invention, in case there is overcurrent to flow through, by suppressing rocking arm 26 to anticlockwise rotation, i.e. rebound, can not dwindle the throw-off distances of movable contact 25 and fixed contact 23, therefore can shorten the residence time of the electric arc that between movable contact 25 and fixed contact 23, produces, can successfully make it to move and extinguishing arc to the direction of explosion chamber 38, in the short time, open circuit, reduce the bad phenomenon that opens circuit.In addition, owing to shortened the residence time of electric arc, the loss of can take in sail contact 25a and fixed contact 24.In addition, because rocking arm 26 is adapted to arresting lever 32 and is being the level of state substantially above electromagnetic trip device 34 in the user mode usually, just can utilize the deadweight of arresting lever 32, therefore, back-moving spring 32d to be set the above-mentioned conventional apparatus good even do not resemble between rocking arm 26 and the arresting lever 32.Its result, holding section 32b also can not resemble to state and be arranged on the mobile of plunger 36 conventional apparatus and establish on the line, therefore, can reduce lateral dimension, obtain the circuit-breaker of compact conformation.
Circuit-breaker of the present invention is a kind of being provided with: the insulation framework; Be loaded on the fixed contact in this framework; Can be facing to the movable contact of this fixed contact contact, disengagement; Have the rocking arm of this movable contact of driving and the switching mechanism of arresting lever; Be located at the insulation framework and with the block of rocking arm butt with the maximum disengaged position of decision movable contact; Have owing to overcurrent starts so that the arresting lever of switching mechanism moves to the electromagnetic trip device of the plunger on the trip position, its characteristics are: plunger and arresting lever have the holding section of mutual engaging, these holding sections also engage when by switching mechanism movable contact disengagement and rocking arm being collided in electromagnetic trip device startup back with block mutually, during plunger remains on activated position, arresting lever is remained on the trip position, prevent that thus movable contact from knock-oning to make position.
Therefore, even rocking arm knock-ons because of block; the backwards rotation of rocking arm also can be stoped by the plunger that remains on the activated position because of arc current; can keep the throw-off distances of movable contact and fixed contact thus reliably; shorten the time that electric arc is detained between movable contact and fixed contact; minimizing is opened circuit bad, can reduce the loss of movable contact and fixed contact simultaneously again.
Claims (1)
1. a circuit-breaker is provided with: the insulation framework; Be loaded on the fixed contact in this framework; Can be facing to the movable contact of this fixed contact contact, disengagement; Have the rocking arm of this movable contact of driving and the switching mechanism of arresting lever; Be located at above-mentioned insulation framework, determine the block of the maximum disengaged position of above-mentioned movable contact with above-mentioned rocking arm butt; Have under overcurrent and to start so that the above-mentioned arresting lever of above-mentioned switching mechanism moves to the electromagnetic trip device of the plunger on the trip position,
It is characterized in that, above-mentioned plunger (36) and above-mentioned arresting lever (32) have the holding section (36a, 32b) of mutual engaging usefulness, these holding sections (36a, 32b) also engage above-mentioned movable contact (25) disengagement, above-mentioned rocking arm (26) by above-mentioned switching mechanism (300) after above-mentioned electromagnetic trip device (34) start mutually when colliding with above-mentioned block (26a), during above-mentioned plunger (36) remains on above-mentioned activated position, above-mentioned arresting lever (32) is remained on above-mentioned trip position
Above-mentioned rocking arm (26) is provided with block with above-mentioned arresting lever (32) the butt portion (26b) that is fixed,
Prevent that thus above-mentioned movable contact (25) from knock-oning to make position.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP345341/00 | 2000-11-13 | ||
| JP2000345341A JP4489930B2 (en) | 2000-11-13 | 2000-11-13 | Circuit breaker |
| JP345341/2000 | 2000-11-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1353439A CN1353439A (en) | 2002-06-12 |
| CN1189912C true CN1189912C (en) | 2005-02-16 |
Family
ID=18819388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB01124383XA Expired - Fee Related CN1189912C (en) | 2000-11-13 | 2001-07-26 | Circuit breaker |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4489930B2 (en) |
| CN (1) | CN1189912C (en) |
Families Citing this family (3)
| 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 |
| JP5297270B2 (en) * | 2009-06-09 | 2013-09-25 | 三菱電機株式会社 | Circuit breaker |
| US9208962B2 (en) | 2013-11-26 | 2015-12-08 | General Electric Company | Circuit breaker including an anti-rebound system, anti-rebound system for a circuit breaker and method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0512982A (en) * | 1991-07-04 | 1993-01-22 | Mitsubishi Electric Corp | Circuit breaker |
| US5214402A (en) * | 1991-12-23 | 1993-05-25 | North American Philips Corporation | Trip link latch and interpole link for a circuit breaker |
| JP3409985B2 (en) * | 1996-12-05 | 2003-05-26 | 三菱電機株式会社 | Circuit breaker |
| JP2001307613A (en) * | 2000-04-18 | 2001-11-02 | Mitsubishi Electric Corp | Circuit breaker |
-
2000
- 2000-11-13 JP JP2000345341A patent/JP4489930B2/en not_active Expired - Lifetime
-
2001
- 2001-07-26 CN CNB01124383XA patent/CN1189912C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP4489930B2 (en) | 2010-06-23 |
| CN1353439A (en) | 2002-06-12 |
| JP2002150915A (en) | 2002-05-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050216 Termination date: 20200726 |