CN201673872U - Plastic casing type low voltage circuit breaker - Google Patents

Plastic casing type low voltage circuit breaker Download PDF

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Publication number
CN201673872U
CN201673872U CN2010201915664U CN201020191566U CN201673872U CN 201673872 U CN201673872 U CN 201673872U CN 2010201915664 U CN2010201915664 U CN 2010201915664U CN 201020191566 U CN201020191566 U CN 201020191566U CN 201673872 U CN201673872 U CN 201673872U
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CN
China
Prior art keywords
pivot pin
contact
spring
support
moving contact
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Expired - Fee Related
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CN2010201915664U
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Chinese (zh)
Inventor
吴金辉
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SHANGHAI HUALIAN LOW-PRESSURE ELECTRICAL APPLIANCES CO LTD
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SHANGHAI HUALIAN LOW-PRESSURE ELECTRICAL APPLIANCES CO LTD
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Priority to CN2010201915664U priority Critical patent/CN201673872U/en
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Publication of CN201673872U publication Critical patent/CN201673872U/en
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Abstract

The utility model provides a plastic casing type low voltage circuit breaker, which comprises a casing and a contact system mounted in the casing, an arc-extinguishing chamber, a controlling mechanism and an over current trip, wherein, the contact system comprises a moving contact assembly and a stationary contact assembly; a first breakpoint and a second breakpoint for breaking the circuits are provided on the moving contact assembly and the stationary contact head; the controlling mechanism is connected with the moving contact assembly and can be drive the moving contact assembly to rotate; the over current trip is contacted with the controlling mechanism, and the over current trip and the controlling mechanism form the locking and unlocking relationships. Based on the small space, volume and operating force, the utility model can implement the improving of the breaking capacity and the accessory modularization, the utility model can wholly perform the integral insertion mounting on the casing, the mounting is convenient and the performance is reliable.

Description

Moulded case low voltage circuit breaker
Technical field
The utility model relates to a kind of electric product, relates in particular to a kind of moulded case 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 system, arc control device, operating mechanism, overcurrent trip and some function accessories; as a kind of protection electric appliances; generally be used at ordinary times connecting or power circuit separately; when in power circuit, fault current being arranged; it can detect and timely disengagement failure circuit automatically, with the safety of protection circuit and equipment.
Because the capacity of electric power network is increasing now, the short circuit current in the power circuit is also increasing, and this just has higher requirement to the short circuit breaking capacity of circuit breaker, and will consider the size of shared spatial volume.The performance index of low-voltage circuit breaker mainly are subjected to the influence of small product size and structure, and volume, breaking capacity and operating physical force always are difficult to satisfy simultaneously.Less such as volume, breaking capacity is just not high, even newer new technologies such as employing double break point, breaking capacity is big a lot, but volume is also bigger, and operating physical force is also big a lot.
The utility model content
The purpose of this utility model in order to overcome the problems referred to above that prior art exists, provides the moulded case low voltage circuit breaker that a kind of volume is little, breaking capacity is high exactly.
In order to achieve the above object, the utility model has adopted following technical scheme: a kind of moulded case low voltage circuit breaker comprises housing and is installed in housing interior contact system, arc control device, operating mechanism and overcurrent trip; Described housing is connected and composed by base and lid;
Described contact system is arranged on the middle part in the housing, comprises moving contact component and fixed contact assembly; Moving contact component and fixed contact assembly are installed on the base respectively and form corresponding relation up and down, but moving contact component and fixed contact assembly are provided with first breakpoint and second breakpoint of open circuit;
Described arc control device are installed between fixed contact assembly and the housing and are arranged on a side of contact system;
Described operating mechanism is installed on the base of housing and is positioned at the top of moving contact component, and operating mechanism links to each other with moving contact component and can drive moving contact component and rotates;
Described overcurrent trip is installed on the base of housing and is arranged on the opposite side of contact system, and overcurrent trip contacts with operating mechanism and links to each other and form the locking and unlocking relation with operating mechanism.
Described moving contact component comprises rotating shaft, moving contact, extension spring and first connecting rod; Rotating shaft is movably arranged on the base and can rotates by the corresponding arcwall face on base, is fixed with first pivot pin in the rotating shaft, and the rotating shaft middle part is provided with a type groove under shed, and the type groove is arranged with downward open U-shaped channel on the two side; Moving contact comprises rear portion and the front portion that fuses, and the rear portion is inlaid in the type groove of rotating shaft and by lead and links to each other with overcurrent trip, and the rear portion is fixed with second pivot pin and the 3rd pivot pin and is provided with an arc bump that stretches out to the upper right side; Anterior stretch out and be provided with first silver contact in its lower head to a side; Second pivot pin is installed in the U-lag of rotating shaft and can rotates and move along this U-lag; Arc bump is conflicted to link to each other with first pivot pin and is formed snap close or release relation; Totally two symmetries of extension spring is connected the elastic force that return is provided to moving contact between first pivot pin and the 3rd pivot pin; One end of first connecting rod links to each other with the 4th pivot pin, and the 4th pivot pin links to each other with operating mechanism and can be driven by operating mechanism, and first pivot pin in the other end of first connecting rod and the rotating shaft is fixedly linked, and first connecting rod can drive rotating shaft and moving contact rotates together.
Described fixed contact assembly comprises first support, fixed contact, resistance, conductive plate and torsion spring; On the first support mounting seat; Fixed contact links to each other by the 5th pivot pin and first support are rotatable, and stretch out to the both sides of fixed contact at the two ends of the 5th pivot pin; Conductive plate is fixedly mounted on the base; Resistance is connected between fixed contact and the conductive plate by flexible conductor; The middle part of torsion spring is fastened in the two ends of the 5th pivot pin, and an end of torsion spring is stuck on first support, and the other end is stuck in the lower head of fixed contact; The above-head of fixed contact is provided with second silver contact, and the afterbody below of fixed contact is provided with the 3rd silver contact; The afterbody top of conductive plate is provided with the 4th silver contact, but contact first breakpoint of continuous and formation open circuit between first silver contact of second silver contact and moving contact, but contact second breakpoint of continuous and formation open circuit between the 3rd silver contact and the 4th silver contact.
Described operating mechanism comprises second support, snap close, first spring, draw bar, second spring, tripping, second connecting rod, lever, the 3rd spring, handle and push rod; Second support is installed on the base; Snap close links to each other with second support by the snap close axle; One end of first spring leans against on the snap close, and the other end is stuck in the corresponding slotted eye of second support; Draw bar is installed in the open slot of second support; One end of second spring is connected in the corresponding slotted eye of second support, and the other end is connected on the draw bar; Tripping is provided with the 6th pivot pin and the 7th pivot pin, and an end of second connecting rod is fixed on the 6th pivot pin, and the other end is stuck on the 4th pivot pin in the moving contact component, and the 7th pivot pin is installed in the corresponding slotted eye of second support; One end of lever links to each other with the 6th pivot pin, and the other end is stuck on the corresponding boss of second support and can rotates around this boss; One end of the 3rd spring hangs on the lever, and the other end hangs on the 4th pivot pin in the moving contact component; Handle is installed on the lever and passes housing and protrudes upward; Push rod is fixed on the outer end of the 7th pivot pin and can rotates with the 7th pivot pin.
Described overcurrent trip comprises yoke, thermo bimetal, thermal element, the 3rd support, armature, the 4th spring and joint cover; Yoke is installed in the corresponding slotted eye of base, and thermo bimetal, thermal element and the 3rd support are superimposed and yoke is fixedly linked; The 3rd support is provided with the 8th pivot pin, and armature is fixedly set on the 8th pivot pin; One end of the 4th spring hangs on the armature, and the other end links to each other with the 3rd support; Joint cover is arranged on the thermal element and with this thermal element and base and is fixedly linked; Upper end the thermo bimetal is equipped with screw, and the position of this screw is corresponding with the draw bar in the operating mechanism and can promote the draw bar rotation.
Described arc control device comprise arc separating wall, arc quenching plate and striking sheet; Arc separating wall is the shaped as frame structural member, and its both sides inwall is arranged with the multilayer skewed slot, and in a plurality of each layer of arc quenching plates difference plug-in mounting Dou grooves, the striking sheet is close to undermost arc quenching plate and is inserted in the undermost skewed slot.
Also comprise device for under-voltage releasing equipment, shunt release and additional alarm contact; Described lid comprises loam cake, lower cover, goes up button, knob down and stage clip; Loam cake and lower cover are fixedly linked and are provided with the hole that is used to allow the handle of operating mechanism stretch out, and are provided with inclined-plane and two appendage socket that are used to push down arc control device in the inside of lower cover; Knob down is arranged on down and covers, and the lower surface of knob down is the inclined-plane; Last button is arranged on and covers and stretch into lower cover and can contact with knob down, and stage clip is arranged between button and the knob down; Device for under-voltage releasing equipment, shunt release and additional alarm contact are assemblied in respectively in the above-mentioned appendage socket; Be provided with the inclined-plane, upper end that is used for inclined-plane, the lower end interoperation of knob down on the draw bar in operating mechanism.
The top indention of the armature in the described overcurrent trip, described the 4th spring can hang in the different teeth groove on this zigzag top to adjust spring tension.
Also comprise dividing plate, this dividing plate is connected the outlet side of arc control device, and dividing plate is provided with a plurality of ventholes.
Described snap close is provided with first draw-in groove and second draw-in groove, and described tripping is provided with the fixture block that is used to snap in above-mentioned first draw-in groove, and described draw bar is provided with the boss that is used to snap in above-mentioned second draw-in groove.
The utility model moulded case low voltage circuit breaker since adopt above technical scheme, make it compared with prior art, have following advantage and characteristics:
1, volume is little, breaking capacity is high, institute's space of points is little.Littler by about 30% than the product of identical housings frame electric current, identical breaking capacity, allow the user that more more options leeway is arranged;
2, contact system adopts large opening design and double break point technology, helps striking, blow-out, and interrupting performance is more reliable, adopts the breaking capacity height.
3, operating physical force is little, easy for installation.Because the design of double break point has reduced operating physical force on following contact assembly.
4, annex is installed simple.Accessory moduleization, insertion downwards gets final product.
5, the arc control device assembling is simple, and the striking performance is good.Arc quenching plate directly inserts and get final product in the arc control device, has replaced the operation of wanting also to want behind the plug-in mounting riveted to have, and the cost reduction is simple to operate.
Description of drawings
Fig. 1 is the section structure schematic diagram of the utility model moulded case low voltage circuit breaker;
Fig. 2 is the broken section structural representation of the cap in the utility model;
Fig. 3 is the section structure schematic diagram of the base in the utility model;
Fig. 4 is the section structure schematic diagram of the moving contact component in the utility model;
Fig. 5 is the structural representation of the moving contact in the utility model;
Fig. 6 is the section structure schematic diagram of the rotating shaft in the utility model;
Fig. 7 is the section structure schematic diagram of the fixed contact assembly in the utility model;
Fig. 8 is the plan structure schematic diagram of the fixed contact assembly in the utility model;
Fig. 9 is the section structure schematic diagram of the operating mechanism in the utility model;
Figure 10 is the perspective view of the operating mechanism in the utility model;
Figure 11 is the section structure schematic diagram of the snap close in the utility model;
Figure 12 is the perspective view of the draw bar in the utility model;
Figure 13 is the structural representation of the overcurrent trip in the utility model;
Figure 14 is the section structure schematic diagram of the arc control device in the utility model;
Figure 15 is the perspective view of the arc separating wall in the utility model;
Figure 16 is that circuit breaker of the present utility model is detained the operation principle schematic diagram again;
Figure 17 is a breaker closing operation principle schematic diagram of the present utility model;
Figure 18 is a circuit breaker overload trip free operation principle schematic diagram of the present utility model;
Figure 19, Figure 20 are circuit breaker short circuit trip free operation principle schematic diagrames of the present utility model;
Figure 21 is a manpower test dropout operation principle schematic diagram of the present utility model;
Figure 22 is the structural representation of the additional alarm contact in the utility model;
Figure 23 is the structural principle schematic diagram of the shunt release in the utility model;
Figure 24 is the structural principle schematic diagram of the device for under-voltage releasing equipment in the utility model.
Embodiment
Referring to Fig. 1, the utility model moulded case low voltage circuit breaker comprises housing 1 and is installed in housing interior contact system, arc control device 4, operating mechanism 5 and overcurrent trip 6 that contact system comprises moving contact component 2 and fixed contact assembly 3.
Cooperation is referring to Fig. 2, Fig. 3, and the housing 1 in the utility model is connected and composed by base 11 and lid 12.Lid 12 comprises loam cake 121, lower cover 122, goes up button 123, knob down 124 and stage clip 125.Loam cake and lower cover are fixedly linked and are provided with the hole 13 that is used to allow the handle of operating mechanism stretch out, be provided with the inclined-plane 1221 that is used to push down arc control device and two appendage socket (not shown come out) in the inside of lower cover 122, two appendage socket are used to install additional alarm contact 7, shunt release 8 and device for under-voltage releasing equipment 9.Knob down 124 is arranged on the lower cover 122, and the lower surface of knob down is inclined-plane 1241; Last button 123 is arranged on and covers and stretch into lower cover and can contact with knob down 124, and stage clip 125 is arranged between button and the knob down.The slotted eye 114 of on base 11, be provided with the deep-slotted chip breaker 111 that is used for ccontaining rotating shaft, be used for clamping the slotted eye 112 of the yoke of overcurrent trip 6, the slotted eye 113 and being used to that is used for second support of fitting operation mechanism 5 being installed first support of fixed contact assembly 3.
Contact system is arranged on the middle part in the housing, comprises moving contact component 2 and fixed contact assembly 3.Moving contact component 2 and fixed contact assembly 3 are installed on the base 11 respectively and form corresponding relation up and down, but moving contact component 2 and fixed contact assembly 3 are provided with first breakpoint and second breakpoint of open circuit.
Cooperation is referring to Fig. 4, Fig. 5, Fig. 6, and the moving contact component 2 in the utility model comprises rotating shaft 21, moving contact 22, extension spring 23 and first connecting rod 24; Rotating shaft 21 is movably arranged on the base 11 and can rotates by the corresponding deep-slotted chip breaker 111 on base, is fixed with first pivot pin 25 in the rotating shaft 21, and the rotating shaft middle part is provided with a type groove 211 under shed, and the type groove is arranged with downward open U-shaped channel 212 on the two side.Moving contact 22 comprises the rear portion 221 and anterior 222 that fuses, the type groove 211 interior leads 20 that also pass through that the rear portion is inlaid in rotating shaft link to each other with overcurrent trip 6, are fixed with second pivot pin 26 and the 3rd pivot pin 27 on the rear portion 221 and are provided with an arc bump 223 that stretches out to the upper right side; Anterior 222 stretch out and are provided with first silver contact 28 in its lower head to a side; Second pivot pin 26 is installed on U-lag 212 interior can and the moving along this U-lag rotation of rotating shaft; Arc bump 223 is conflicted to link to each other with first pivot pin 25 and is formed snap close or release relation; Totally two symmetries of extension spring 23 is connected the elastic force that return is provided to moving contact between first pivot pin 25 and the 3rd pivot pin 27; One end of first connecting rod 24 links to each other with the 4th pivot pin 29, the 4th pivot pin 29 links to each other with operating mechanism and can be driven by operating mechanism, first pivot pin 25 in the other end of first connecting rod 24 and the rotating shaft is fixedly linked, and first connecting rod 24 can drive rotating shaft 21 and moving contact 22 rotates together.
Cooperation is referring to Fig. 7, Fig. 8, and the fixed contact assembly 3 in the utility model comprises first support 31, fixed contact 32, resistance 33, conductive plate 34 and torsion spring 35.On first support, 31 mounting seat; Fixed contact 32 is by the 5th pivot pin 36 and 31 rotatable linking to each other of first support, and stretch out to the both sides of fixed contact 32 at the two ends of the 5th pivot pin 36; Conductive plate 34 is fixedly mounted on the base; Resistance 33 is connected between fixed contact 32 and the conductive plate 34 by flexible conductor; The middle part of torsion spring 35 is fastened in the two ends of the 5th pivot pin 36, and an end of torsion spring is stuck on first support 31, and the other end is stuck in the lower head of fixed contact 32; The above-head of fixed contact 32 is provided with second silver contact 37, and the afterbody below of fixed contact is provided with the 3rd silver contact 38; The afterbody top of conductive plate is provided with the 4th silver contact 39, but contact first breakpoint of continuous and formation open circuit between first silver contact 28 of second silver contact 37 and moving contact, but contact second breakpoint of continuous and formation open circuit between the 3rd silver contact 38 and the 4th silver contact 39.Shown in Fig. 7, Fig. 8,310,311 is arc insulating apparatus.
Cooperation is referring to Fig. 9, Figure 10, Figure 11, Figure 12, and the operating mechanism 5 in the utility model is installed on the base of housing and is positioned at the top of moving contact component 2, and operating mechanism 5 links to each other with moving contact component 2 and can drive moving contact component and rotates.Operating mechanism 5 comprises second support 51, snap close 52, first spring 53, draw bar 54, second spring 55, tripping 56, second connecting rod 57, lever 58, the 3rd spring 59, handle 510 and push rod 501.Second support 51 is installed on the base; Snap close 52 links to each other with second support by snap close axle 521; One end of first spring 53 leans against on the snap close 52, and the other end is stuck in the corresponding slotted eye 511 of second support 51; Draw bar 54 is installed in the open slot 512 of second support 51; One end of second spring 55 (totally two) is connected in the corresponding slotted eye 511 of second support 51, and the other end is connected on the draw bar 54; Tripping 56 is provided with the 6th pivot pin 561 and the 7th pivot pin 562, one end of second connecting rod 57 (totally two) is fixed on the 6th pivot pin 561, the other end is stuck on the 4th pivot pin 29 in the moving contact component, and the 7th pivot pin 562 is installed in the corresponding slotted eye of second support 51; One end of lever 58 links to each other with the 6th pivot pin 561, and the other end is stuck on the corresponding boss 513 of second support 51 and can rotates around this boss; One end of the 3rd spring 59 hangs on the lever, and the other end hangs on the 4th pivot pin 29 in the moving contact component; Handle 510 is installed on the lever 58 and passes housing 1 and protrudes upward; Push rod 501 is fixed on the outer end of the 7th pivot pin 562 and can rotates with the 7th pivot pin.On draw bar 54, be provided with the inclined-plane, upper end 541 that is used for inclined-plane, the lower end interoperation of knob down.On snap close 52, be provided with first draw-in groove 522 and second draw-in groove 523, in tripping 56, be provided with the fixture block 563 that is used to snap in above-mentioned first draw-in groove 522, on draw bar 54, be provided with the boss 542 that is used to snap in above-mentioned second draw-in groove 523.
Cooperation is referring to Figure 13, and the overcurrent trip 6 in the utility model is installed on the base of housing and is arranged on the opposite side of contact system, and overcurrent trip 6 contacts with operating mechanism 5 and links to each other and form the locking and unlocking relation with operating mechanism.Overcurrent trip 6 comprises yoke 61, thermo bimetal 62, thermal element 63, the 3rd support 64, armature 65, the 4th spring 66 and joint cover 67.Yoke 61 is installed in the corresponding slotted eye 112 of base, and thermo bimetal 62, thermal element 63 and the 3rd support 64 are superimposed and yoke 61 is fixedly linked; The 3rd support 64 is provided with the 8th pivot pin 68, and armature 65 is fixedly set on the 8th pivot pin 68; One end of the 4th spring 66 hangs on the armature 65, and the other end links to each other with the 3rd support 64; Joint cover 67 is arranged on an end of thermal element 63 and is fixedly linked with this thermal element 63 and base 11, and the other end of thermal element 63 links to each other with moving contact 22 by lead 20.In thermo bimetal 62 upper end screw 69 is installed, draw bar in the position of this screw 69 and the operating mechanism 54 is corresponding and can promote draw bar 54 and rotate.Top 651 indentions of armature 65, the 4th spring 66 can hang in the different teeth groove on this zigzag top to adjust spring tension.
Cooperation is referring to Figure 14, Figure 15, and the arc control device 4 in the utility model are installed between fixed contact assembly 3 and the housing 1 and are arranged on a side of contact system.Arc control device 4 comprise arc separating wall 41, arc quenching plate 42,43, striking sheet 44 and dividing plate 45; Arc separating wall 41 is the shaped as frame structural member, and its both sides inwall is arranged with multilayer skewed slot 411, and in a plurality of arc quenching plates 42,43 each layer of difference plug-in mounting Dou grooves, striking sheet 44 is close to undermost arc quenching plate and is inserted in the undermost skewed slot.Dividing plate 45 (referring to Fig. 1) is connected the outlet side of arc control device, and dividing plate 45 is provided with a plurality of ventholes.
But the operation principle accompanying drawings of the utility model circuit breaker is as follows:
The process of button again of circuit breaker: as shown in figure 16, the handle 510 of operating mechanism moves to direction shown in the arrow, lever 58 drives tripping 56 and also rotates to equidirectional, and be deep in first draw-in groove 522 on the snap close 52, first spring 53 that links to each other with snap close simultaneously rotates snap close round about, draw bar 54 is owing to be subjected to the tension of second spring 55, also rotate to the lever equidirectional around bracket holes, withstand the snap close side behind second draw-in groove 523 that small boss on the draw bar 542 surpasses on the snap close at this moment, draw bar stops operating after withstanding, this moment, snap close was because the effect of draw bar, also stop operating, tripping withstand snap close first draw-in groove 522 above, tripping is lockable, and finishes the process of detaining again.
Breaker closing process: referring to Figure 17, handle 510 drives lever 58 and rotates to shown in the arrow, the 3rd spring 59 hauls second connecting rod 57 and moves to direction shown in the arrow, first connecting rod 24 is driven by second connecting rod 57, hauls rotating shaft 21 and rotates in the rotary axis groove 111 of base 11, and rotating shaft turns to certain angle, it is limited that the 4th pivot pin 29 is run into tripping 56 sides, moving contact 22 is being with to the motion of fixed contact 32 directions simultaneously, and finally reliably contacts with fixed contact, and operating mechanism 5 is finished making process.Behind the combined floodgate, the resistance 33 in the fixed contact assembly is because resistance is bigger, and electric current flows through along direction shown in the arrow.
The normal separating brake process of circuit breaker: referring to Figure 17, this process is the inverse process that closes a floodgate, handle 510 drives lever 58 motions, the 3rd spring 59 drives the also equidirectional rotation of second connecting rod 57, first connecting rod 24, rotating shaft 21, moving contact 22, moving contact 22 separates with fixed contact 32, finish the separating brake process, the final position as shown in figure 16.
Trip free under the circuit breaker failure current conditions.This moment, fault current divided three kinds of situations: overload current, the less electric current of short circuit, the big electric current of short circuit.
Overload current trip free (1.05In<electric current I<12In, In is a rated current): referring to Figure 18, the thermal element of overcurrent trip is because the thermal effect heating at this moment, heat passes on the thermo bimetal 62 of overcurrent trip, the thermo bimetal is along crooked shown in the figure, behind the certain hour, screw 69 on the thermo bimetal is because thermo bimetal's overbending is pushed up draw bar 54, draw bar 54 rotates along shown in the arrow, small boss 542 on the draw bar leaves the snap close side, fall in second draw-in groove 523 of snap close 52, snap close 52 no longer is pulled the bar small boss after withstanding is release, tripping 56 is moved upward by the upwards component effect of the 3rd spring 59, drives second connecting rod 57 simultaneously, first connecting rod 24, rotating shaft 21, moving contact 22 moves upward, and reaches minimum back operating mechanism up to the suffered spring force of lever and finishes release dropout process.
The trip free process that the short circuit small electric flows down (20In>electric current I 〉=12In): referring to Figure 19, under the normal condition, the armature 65 of overcurrent trip is subjected to the magnetic field suction of yoke 61, and magnetic field suction is much smaller than the spring force of the 4th spring 66 at this moment, armature keeps stablizing inactive state, when circuit breaker under short circuit current, magnetic field suction is much larger than spring force, armature rotates as shown around the 8th pivot pin 68 on the support, push up draw bar 54, also arrow direction upwards after draw bar is stressed, the small boss on the draw bar leaves the snap close side, falls in second draw-in groove 523 of snap close 52, tripping 56 releases, tripping is subjected to the upwards component effect of spring to move upward drivening rod, rotating shaft, the moving contact system moves upward to Fig. 1 position, finishes the dropout process.
Trip free process under the big electric current of short circuit (electric current I 〉=20In): referring to Figure 20, this moment is because electric current is very big, on the one hand, overcurrent trip is finished the trip free process with the operating mechanism release, meanwhile, the U-shaped loop that moving contact 22 and fixed contact 32 form, produce a pair of very large electromagnetic repulsion force, this power equal and opposite in direction, direction is opposite, and this repulsion overcomes moving, spring force on the fixed contact is separately along rotated by force direction, when moving, after fixed contact separates, air dielectric is breakdown, produces big electric arc, and arc control device 4 attract electric arc to arc control device motion arc extinguishing; Meanwhile, after fixed contact 32 rotated, the 3rd following silver contact 38 separated disconnection with the 4th silver contact 39, and electric current is changed its course flows through resistance 33, and resistance 33 absorbs power circuit energy current limliting, after energy is absorbed, also helps arc extinction; Moving contact 22 continues to be subjected to the electromagnetic force effect to move upward, when moving contact 22 rotated, arc bump 223 movement therewith on it surpassed behind its summit by locked, in case electromagnetic force drops down when reducing, moving contact is opened a sizable distance to help blow-out 22 this moments; After operating mechanism is finished the trip free releasing process, connecting rod drives moving contact and moves upward, moving contact 22 continues upwards to rotate above pushing up arc control device, cause arc bump 223 reverse movements on it, surpass its summit, residing position when moving contact 22 returns to original separating brake, as shown in Figure 1.At this moment, electric arc is because the very fast quilt of actings in conjunction such as current limliting of arc control device and high resistance passage extinguishes, and circuit is completely severed, and the air-flow that electric arc produced is along outwards flowing out shown in the arrow.
Manpower test dropout process: referring to Figure 21, test button (cooperating referring to Fig. 2) is arranged on the lid 12 of shell, when pressing button 123, knob down 124 moves downward as shown by arrows, promote the inclined-plane above the draw bar 54, draw bar 54 rotates, small boss 542 on it drops in second draw-in groove 523 of snap close 52, snap close 52 rotates, and the component effect that tripping 56 releases, tripping are made progress by the spring force of the 3rd spring 59 on the lever 58 moves upward, operating mechanism 5 releases, drive lever, rotating shaft, second connecting rod, first connecting rod and moving contact move upward, and circuit is cut off, and finish manpower test dropout process.
The annex operation principle:
Annex comprises additional alarm contact 7, shunt release 8 and device for under-voltage releasing equipment 9.
The structure of additional alarm contact 7 as shown in figure 22.Additional alarm is two groups of normally-open normally-close contacts, is used for showing working state of circuit breaker.Three leads are drawn from Chang Kai and normally closed interlock and are used for showing normally closed and normally open, a movable slider 71 or 73 are all arranged below every group of contact, can slide up and down, when slide block slides, drive the normally-open normally-close contact and do corresponding conversion, a spring leaf 72 is set below the slide block 71, and spring leaf can turn an angle, and promotes slide block 71 slips.The additional alarm contact inserts the lid the inside, and the push rod 511 on the operating mechanism pushes up slide block 73, the stressed normally open contact that is converted to of normally closed interlock along with tripping is rotated.As a same reason, when rotating shaft was rotated, spring leaf 72 pushed up above the rotating shaft, the also stressed normally open contact that is converted to of normally closed interlock.
Shunt release 8 structures as shown in figure 23, by coil 81, iron core 82, lead 83, spring 84,85, spring leaf 86 are formed, spring leaf 86 can rotate around axle 87, the wire bond coil, coil is by the fine copper wire coiled, when lead is switched on, iron core is subjected to the coil suction by adhesive and overcome spring 85 effect to left movement, iron core drives the spring force that spring leaf 86 overcomes spring 84 and outwards turns an angle along the direction of arrow, and spring leaf pushes up the draw bar 54 of operating mechanism, the draw bar small boss lock buckling groove that drops, operating mechanism is triped, and breaker open operation cuts off circuit; When lead does not have electric current, be subjected to spring 84 effects, spring leaf 86 is got back to dotted line position, can't push up draw bar, and circuit breaker keeps original state constant.
The structure of under-voltage release 9 is made up of coil 91, lead 92, iron core 93, head part 94, spring 95,96, spring leaf 97 and axle 98 as shown in figure 24, and spring leaf 97 can rotate around axle 98, and is subjected to spring 95 effects, and lead links to each other with coil.When coil electricity, iron core 93 is sucked by coil and overcomes spring 96 and acts on, head part 94 is non-magnetic conductive parts, and with the iron core interlock, head part is ejected, spring leaf 97 turns to the position as figure, can't arrive draw bar 54 in advance, circuit breaker keeps original state constant, when coil voltage is reduced to certain level or decompression, the suffered suction of iron core is littler than the active force of spring 96, get back to dotted line position, head part 94 can't push up spring leaf, and spring leaf 97 is subjected to spring 95 effects, forward dotted line position to, and push up the draw bar of operating mechanism, the draw bar small boss lock buckling groove that drops, operating mechanism release, circuit breaker tripping cuts off circuit.

Claims (10)

1. a moulded case low voltage circuit breaker comprises housing and is installed in housing interior contact system, arc control device, operating mechanism and overcurrent trip; Described housing is connected and composed by base and lid;
It is characterized in that:
Described contact system is arranged on the middle part in the housing, comprises moving contact component and fixed contact assembly; Moving contact component and fixed contact assembly are installed on the base respectively and form corresponding relation up and down, but moving contact component and fixed contact assembly are provided with first breakpoint and second breakpoint of open circuit;
Described arc control device are installed between fixed contact assembly and the housing and are arranged on a side of contact system;
Described operating mechanism is installed on the base of housing and is positioned at the top of moving contact component, and operating mechanism links to each other with moving contact component and can drive moving contact component and rotates;
Described overcurrent trip is installed on the base of housing and is arranged on the opposite side of contact system, and overcurrent trip contacts with operating mechanism and links to each other and form the locking and unlocking relation with operating mechanism.
2. moulded case low voltage circuit breaker as claimed in claim 1 is characterized in that: described moving contact component comprises rotating shaft, moving contact, extension spring and first connecting rod; Rotating shaft is movably arranged on the base and can rotates by the corresponding arcwall face on base, is fixed with first pivot pin in the rotating shaft, and the rotating shaft middle part is provided with a type groove under shed, and the type groove is arranged with downward open U-shaped channel on the two side; Moving contact comprises rear portion and the front portion that fuses, and the rear portion is inlaid in the type groove of rotating shaft and by lead and links to each other with overcurrent trip, and the rear portion is fixed with second pivot pin and the 3rd pivot pin and is provided with an arc bump that stretches out to the upper right side; Anterior stretch out and be provided with first silver contact in its lower head to a side; Second pivot pin is installed in the U-lag of rotating shaft and can rotates and move along this U-lag; Arc bump is conflicted to link to each other with first pivot pin and is formed snap close or release relation; Totally two symmetries of extension spring is connected the elastic force that return is provided to moving contact between first pivot pin and the 3rd pivot pin; One end of first connecting rod links to each other with the 4th pivot pin, and the 4th pivot pin links to each other with operating mechanism and can be driven by operating mechanism, and first pivot pin in the other end of first connecting rod and the rotating shaft is fixedly linked, and first connecting rod can drive rotating shaft and moving contact rotates together.
3. moulded case low voltage circuit breaker as claimed in claim 1 is characterized in that: described fixed contact assembly comprises first support, fixed contact, resistance, conductive plate and torsion spring; On the first support mounting seat; Fixed contact links to each other by the 5th pivot pin and first support are rotatable, and stretch out to the both sides of fixed contact at the two ends of the 5th pivot pin; Conductive plate is fixedly mounted on the base; Resistance is connected between fixed contact and the conductive plate by flexible conductor; The middle part of torsion spring is fastened in the two ends of the 5th pivot pin, and an end of torsion spring is stuck on first support, and the other end is stuck in the lower head of fixed contact; The above-head of fixed contact is provided with second silver contact, and the afterbody below of fixed contact is provided with the 3rd silver contact; The afterbody top of conductive plate is provided with the 4th silver contact, but contact first breakpoint of continuous and formation open circuit between first silver contact of second silver contact and moving contact, but contact second breakpoint of continuous and formation open circuit between the 3rd silver contact and the 4th silver contact.
4. moulded case low voltage circuit breaker as claimed in claim 1 is characterized in that: described operating mechanism comprises second support, snap close, first spring, draw bar, second spring, tripping, second connecting rod, lever, the 3rd spring, handle and push rod; Second support is installed on the base; Snap close links to each other with second support by the snap close axle; One end of first spring leans against on the snap close, and the other end is stuck in the corresponding slotted eye of second support; Draw bar is installed in the open slot of second support; One end of second spring is connected in the corresponding slotted eye of second support, and the other end is connected on the draw bar; Tripping is provided with the 6th pivot pin and the 7th pivot pin, and an end of second connecting rod is fixed on the 6th pivot pin, and the other end is stuck on the 4th pivot pin in the moving contact component, and the 7th pivot pin is installed in the corresponding slotted eye of second support; One end of lever links to each other with the 6th pivot pin, and the other end is stuck on the corresponding boss of second support and can rotates around this boss; One end of the 3rd spring hangs on the lever, and the other end hangs on the 4th pivot pin in the moving contact component; Handle is installed on the lever and passes housing and protrudes upward; Push rod is fixed on the outer end of the 7th pivot pin and can rotates with the 7th pivot pin.
5. moulded case low voltage circuit breaker as claimed in claim 1 is characterized in that: described overcurrent trip comprises yoke, thermo bimetal, thermal element, the 3rd support, armature, the 4th spring and joint cover; Yoke is installed in the corresponding slotted eye of base, and thermo bimetal, thermal element and the 3rd support are superimposed and yoke is fixedly linked; The 3rd support is provided with the 8th pivot pin, and armature is fixedly set on the 8th pivot pin; One end of the 4th spring hangs on the armature, and the other end links to each other with the 3rd support; Joint cover is arranged on the thermal element and with this thermal element and base and is fixedly linked; Upper end the thermo bimetal is equipped with screw, and the position of this screw is corresponding with the draw bar in the operating mechanism and can promote the draw bar rotation.
6. moulded case low voltage circuit breaker as claimed in claim 1 is characterized in that: described arc control device comprise arc separating wall, arc quenching plate and striking sheet; Arc separating wall is the shaped as frame structural member, and its both sides inwall is arranged with the multilayer skewed slot, and in a plurality of each layer of arc quenching plates difference plug-in mounting Dou grooves, the striking sheet is close to undermost arc quenching plate and is inserted in the undermost skewed slot.
7. moulded case low voltage circuit breaker as claimed in claim 1 is characterized in that: also comprise device for under-voltage releasing equipment, shunt release and additional alarm contact; Described lid comprises loam cake, lower cover, goes up button, knob down and stage clip; Loam cake and lower cover are fixedly linked and are provided with the hole that is used to allow the handle of operating mechanism stretch out, and are provided with inclined-plane and two appendage socket that are used to push down arc control device in the inside of lower cover; Knob down is arranged on down and covers, and the lower surface of knob down is the inclined-plane; Last button is arranged on and covers and stretch into lower cover and can contact with knob down, and stage clip is arranged between button and the knob down; Device for under-voltage releasing equipment, shunt release and additional alarm contact are assemblied in respectively in the above-mentioned appendage socket; Be provided with the inclined-plane, upper end that is used for inclined-plane, the lower end interoperation of knob down on the draw bar in operating mechanism.
8. moulded case low voltage circuit breaker as claimed in claim 5 is characterized in that: the top indention of the armature in the described overcurrent trip, described the 4th spring can hang in the different teeth groove on this zigzag top to adjust spring tension.
9. moulded case low voltage circuit breaker as claimed in claim 6 is characterized in that: also comprise dividing plate, this dividing plate is connected the outlet side of arc control device, and dividing plate is provided with a plurality of ventholes.
10. moulded case low voltage circuit breaker as claimed in claim 4, it is characterized in that: described snap close is provided with first draw-in groove and second draw-in groove, described tripping is provided with the fixture block that is used to snap in above-mentioned first draw-in groove, and described draw bar is provided with the boss that is used to snap in above-mentioned second draw-in groove.
CN2010201915664U 2010-05-13 2010-05-13 Plastic casing type low voltage circuit breaker Expired - Fee Related CN201673872U (en)

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CN2010201915664U CN201673872U (en) 2010-05-13 2010-05-13 Plastic casing type low voltage circuit breaker

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Application Number Priority Date Filing Date Title
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102044386A (en) * 2011-01-10 2011-05-04 张永富 Circuit breaker with switching-off locking function
CN102243953A (en) * 2010-05-13 2011-11-16 上海华联低压电器有限公司 Plastic shell type low-voltage circuit breaker
CN102543603A (en) * 2012-01-20 2012-07-04 浙江鼎威科技有限公司 Ultrathin minitype breaker
CN102789930A (en) * 2011-05-18 2012-11-21 富士电机机器制御株式会社 Circuit breaker
CN104756219B (en) * 2013-02-14 2017-03-01 富士电机机器制御株式会社 Circuit-breaker and the assemble method of circuit-breaker

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102243953A (en) * 2010-05-13 2011-11-16 上海华联低压电器有限公司 Plastic shell type low-voltage circuit breaker
CN102044386A (en) * 2011-01-10 2011-05-04 张永富 Circuit breaker with switching-off locking function
CN102789930A (en) * 2011-05-18 2012-11-21 富士电机机器制御株式会社 Circuit breaker
CN102543603A (en) * 2012-01-20 2012-07-04 浙江鼎威科技有限公司 Ultrathin minitype breaker
CN104756219B (en) * 2013-02-14 2017-03-01 富士电机机器制御株式会社 Circuit-breaker and the assemble method of circuit-breaker

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