CN100349244C - Modular multi-pole double-break contact circuit breaker with plastic casing - Google Patents

Abstract

The present invention relates to a modular multiple-pole double-breakpoint circuit breaker with a plastic casing, which is characterized in that an independent unit box is formed by each monopole breaking unit and is formed by aborally splicing two single-piece box bodies, and a plurality of unit boxes are arranged in a casing type base in parallel; a shaft hole type circular groove is arranged in each unit box, a rotary box is arranged in the shaft hole type circular groove, a movable contact with double breakpoints penetrates through a swing groove arranged in the rotary box and is arranged on a rotary shaft of the rotary box, a large gap is formed between the rotary shaft and a shaft hole of the movable contact to form a floating shape, and one side of the movable contact is pressed on a stopping surface of one end of the swing groove; link mechanisms are respectively connected with an eccentric shaft hole of the rotary box and an operating mechanism; a module is solely formed by a tripping mechanism and is arranged at one end of the base. The bridge-shaped movable contacts of the breaker are in floating connection by the rotary box. The modular multiple-pole double-breakpoint circuit breaker with a plastic casing has the advantages of simple structure, low accuracy requirement, addition of modular design, easy production and assembly and reduction of production cost. Meanwhile, the synchronization of the two contact points of the movable contact is ensured, the interchangeability of components is increased.

Description

The multipole breaker with double breaks and plastic case of modularization

Technical field

The present invention relates to protective overload circuit-breakin, the multipole breaker with double breaks and plastic case of particularly a kind of modularization.

Background technology

Breaker of plastic casing mainly is for being used for low-voltage distribution protection, motor protection and industrial power distribution dish protection system with electric unit, when unusual electric operating mode appears in institute's control circuit, in time cuts off relevant power supply, to protect the safety of whole using electricity system.Usually supply line is by 2 to 3 phase compositions, in order to ensure safety, its 2 phase or 3 phase electrodes should be cut off simultaneously, and the inside of used circuit breaker generally also is divided into 2 to 3 grid, makes between each utmost point to keep apart, and is respectively equipped with dynamic and static contact and arc control device in each grid, constitute a plurality of one pole breaking units, this just makes breaker structure comparatively complicated, assembles also cumbersomely, causes the circuit breaker cost higher.Particularly experimental study proves closely during the last ten years: the current limiting performance of dual-interruption point breaker is the strongest, but double-breakpoint structure has more increased the structural complexity of circuit breaker, and manufacturing cost can be bigger, is the problem that presses for solution.Put down in writing in Chinese patent ZL92111529.6 number " multipole circuit breaker " document with unit of single pole units, it adopts bridge shape moving contact, this contact floating ground is installed on the rod piece, adopt two connecting rods to reach the mechanical connection of rigidity between the different bars, thereby realized each interpolar reliably working of circuit breaker, the defective on making has been compensated by means of the minim gap between bar block and the box.So-called bridge shape moving contact is meant that these contact both sides respectively are provided with a contact, and can the middle part be that axle rotates, and in the hope of realizing disjunction and conducting with 2 fixed contacts at each utmost point two ends, is a kind of double break point switch.The described structure of above-mentioned patent will realize the consistency that different units disposes, and with the gyration of connection of different poles rod piece and realization bridge-shaped contact rule, the related components accuracy of manufacture and assembly precision are vital.Otherwise owing to make and that rigging error causes is respectively extremely asynchronous, be delivered to the realization that each pole moment loss of both sides etc. all can influence the circuit breaker function.Existing circuit breaker comprises the circuit breaker of above-mentioned patent, relies on the short circuit current effect that moving contact is scolded out, but the action of threading off is still longer; A tree name " electrical equipment manufacturing technology handbook (China Machine Press, in December, 1999 version) record, a kind of polymer gas exhausted material is arranged, be placed near the contact, when the circuit breaker disjunction, the high heat that electric arc between contact produces makes this material production help the gas of arc extinction, this gas boosts in the semitight cavity and is directed to and gives fixed gas outlet, this gas exhausted material also claims organic insulating material, institute's aerogenesis body can make the electric arc cooling, and can drive electric arc and enter arc-chute and, can improve the circuit breaker interrupting performance to gas outlet ejection.

Summary of the invention

The purpose of this invention is to provide the multipole breaker with double breaks and plastic case of a kind of rapid-releasing, this circuit breaker adopts modularized design and double break point bridge-shaped contact structure, bridge shape moving contact adopts floating type connection, simplify the structure, reduced required precision, guaranteed the reliability of circuit breaker function, modularized design simultaneously can reduce makes and assembly cost.

For achieving the above object, the present invention takes following design: each one pole breaking units of the multipole breaker with double breaks and plastic case of this modularization forms an independently unit box, each unit box by about the monolithic box body of two counterparts splicing constitute, a plurality of unit boxes are installed in the case type pedestal side by side; Installing in each unit box changes box, this commentaries on classics box is a cylindrical shape housing, offer 2 contact swinging chutes of symmetry mutually on its cylindrical, its place, axle center is provided with rotating shaft, double break point moving contact passes 2 swinging chutes, its middle part axis hole is loaded in the rotating shaft, big gap is arranged between axis hole and the rotating shaft, moving contact is pressed on the end stop surface of swinging chute by torsion spring, commentaries on classics box one side end face is departed from rotating shaft place and is provided with the connecting rod axis hole, and this axis hole links to each other with connecting rod by connecting axle, and connecting rod end in addition links to each other with operating mechanism, be provided with in the unit box and the shaft hole mode circular groove that changes box profile coupling, constitute planar kinematic pair with the commentaries on classics box; Release constitutes a module separately, is loaded on an end of pedestal.

The multipole breaker with double breaks and plastic case of modularization of the present invention is provided with a plurality of one pole breaking units, and each unit forms an independently unit box, each unit box by about the monolithic box body of two counterpart splicings constitute.Be provided with 2 fixed contacts in the unit box, 2 arc control device, double break point moving contact middle part is loaded in the rotating shaft of changeing box, two ends pass the contact swinging chute that changes box, and be pressed in by torsion spring on the stop surface of this groove one side, 2 moving contacts are corresponding with the fixed contact position of both sides respectively, change in the box-packed shaft hole mode circular groove that matches in unit box.Because unit box is to be formed by 2 box body counterpart splice graftings, as cassette, every box body becomes more shallow flute profile.Although box is interior is that fixed contact is installed, and arc control device and its planform of commentaries on classics box are comparatively complicated, still can pass through mould compression molding successfully, are easy to manufacturing, and are convenient to assemble parts wherein.After each unit box assembles, in the case type pedestal of packing into together, constitute each utmost point of multipole circuit breaker, each unit box relies on the outside shape of adjacent wall to locate mutually, guarantees the stability of unit box in pedestal.Modular release is loaded on an end of pedestal, can dismantle, and not only is easy to the assembling of making, and can exchanges as required.Operating mechanism is to drive to change the box motion, thereby drives the mechanism of moving contact on/off switch, and it is loaded in the loam cake of pedestal, and its handle passes loam cake, and for closing by hand, it is connected with the commentaries on classics box by a connecting rod.The aforesaid modular designs that adopts this circuit breaker can reduce to be made and assembly cost.This circuit breaker adopts simultaneously changes the moving moving contact structure of boxlike bridge, relatively No. 92111529.6 patents, simplified structure really.Because the gap between the rotating shaft on the axis hole of double break point moving contact and the commentaries on classics box is bigger, form quick condition, it is asynchronous to remedy two contacts that caused by foozle, guaranteed the good function of use of circuit breaker, relatively No. 92111529.6 patents have reduced the required precision of making, reduced the difficulty of making, favourable reduction product cost.

Description of drawings

Fig. 1 is the overall structure schematic diagram of breaker of plastic casing of the present invention

Fig. 2 is a unit box cut-away view of the present invention

Fig. 3 is that unit box associated mechanisms of the present invention connects schematic diagram

Fig. 4 is the commentaries on classics box structural representation of bridge moving contact

Among the figure: 1a, 1b unit box box body, 2 change box, 3 double break point moving contacts, 4 arc control device, 5 fixed contacts, 6 organic insulation sheets, 7 gas storage storehouses, 8 arc control device, 9 fixed contacts, 10 organic insulation sheets, 11 releases, 12 renovate, 13 loam cakes, 14 operating mechanisms, 15 pedestals, 16 pneumatic levers, 17 rotating shafts, 18 linkages, 19 torsion springs, 20 puff prots, 21 swinging chutes, 22 locking contacts faces, 23 snap closes, 24 connecting rod axis holes, 25 hinges.

Embodiment

The multipole breaker with double breaks and plastic case of this modularization, each one pole breaking units form an independently unit box, each unit box by about monolithic box body 1a, the 1b of two counterpart splicings constitute, a plurality of unit boxes are installed in the case type pedestal 15 side by side; Installing in each unit box changes box 2, this commentaries on classics box is a cylindrical shape housing, offer 2 contact swinging chutes 21 of symmetry mutually on its cylindrical, its place, axle center is provided with rotating shaft 17, double break point moving contact 3 passes 2 swinging chutes, its middle part axis hole is loaded in the rotating shaft, bigger gap is arranged between axis hole and rotating shaft, moving contact is pressed on the stop surface 22 of swinging chute one end by torsion spring 19, commentaries on classics box one side end face is departed from rotating shaft place and is provided with connecting rod axis hole 24, links to each other with connecting rod by connecting axle, and linkage 18 end in addition links to each other with operating mechanism 14, be provided with in the unit box and the shaft hole mode circular groove that changes box profile coupling, constitute planar kinematic pair with the commentaries on classics box; Release 11 constitutes a module separately, is loaded on an end of pedestal.

In recent years, discover that utilizing organic insulating material to produce gas under the light of electric arc and high temperature can make the electric arc cooling, improves its cooling rate.The generation of this gas has strengthened the air pressure of the semiclosed housing of circuit breaker in addition, add the thermal expansion that adds of high-temperature gas, have certain pressure, the pressure of gas passes arc control device to its opening part ejection of end in addition, and the jet flow of this gas can allow electric arc enter arc control device rapidly, quickening the cooling of electric arc extinguishes, the favourable arc voltage that provides reduces current strength (interim on the books as low-voltage electrical apparatus calendar year 2001 the 6th), and this kind material has ultrapas, phenolic resins etc., best with the ultrapas effect.The drop-away time of considering existing circuit breaker is still longer, not ideal enough, can utilize gas exhausted material produce air pressure as power-assisted, drop-away time is accelerated.The favourable formation relative closure of unit box structure of the present invention better space, double break point moving contact can increase the amount and the pressure (electric arc that only produces just can have effect to aerogenesis) of aerogenesis between contact simultaneously.Concrete scheme is: strengthen commentaries on classics box one side oscillation slot length, make it near the semi-circumference shape, and change end face of box and make the large semicircle shape, make the shaft hole mode circular groove of unit box change the box indentation, there and change formation gas storage storehouse 7 in the box; Near the organic insulating trip 6,10 of installing fixed contact or moving contact breakpoint, on the sidewall of unit box, offer puff prot 20, cross hinge 25 in the puff prot bypass pneumatic lever 16 is installed, hinge is positioned at the middle part of lever, it is relative with puff prot that its underpart is provided with fin 161, and its top contacts with the snap close 23 of tripping mechanism.When circuit breaker is controlled the short circuit current that appearance is bigger in the circuit, electrodynamic repulsion force is scolded out moving contact, between dynamic/static contact, produce electric arc, under the high arc temperature effect, organic insulation sheet (gas exhausted material) produces a large amount of gases, particularly produce simultaneously near 2 breakpoints, more much bigger than the aerogenesis pressure of single-break circuit breaker.This gas is sprayed by puff prot, blows the fin of lever 16, drives lever end swing in addition, promotes snap close, makes mechanism touch lock, for breaker open operation provides power-assisted, can improve the speed of circuit breaker tripping.

Claims (1)

1. multipole breaker with double breaks and plastic case of modularization, be provided with bridge shape moving contact in each one pole breaking units, each one pole breaking units forms an independently unit box, each unit box by about the monolithic box body of two counterparts splicing constitute, a plurality of unit boxes are installed in the case type pedestal side by side; Installing in each unit box changes box, this commentaries on classics box is a cylindrical shape housing, offer 2 contact swinging chutes of symmetry mutually on its cylindrical, its place, axle center is provided with rotating shaft, double break point moving contact passes 2 swinging chutes, its middle part axis hole is loaded in the rotating shaft, big gap is arranged between axis hole and the rotating shaft, commentaries on classics box one side end face is departed from rotating shaft place and is provided with the connecting rod axis hole, this axis hole links to each other with linkage by connecting axle, and linkage end in addition links to each other with operating mechanism, is provided with in the unit box and the shaft hole mode circular groove that changes box profile coupling, making changes box formation planar kinematic pair, it is characterized in that:

The length of changeing box one side oscillation groove strengthens, and near the semi-circumference shape, and changes end face of box and makes the large semicircle shape, makes the shaft hole mode circular groove of unit box constitute the gas storage storehouse in commentaries on classics box indentation, there in the box with changeing; The organic insulating trip of installing is offered puff prot on the sidewall of unit box near fixed contact or moving contact breakpoint, crosses hinge in the puff prot bypass pneumatic lever is installed, and it is relative with puff prot that the lever bottom is provided with fin, and its top contacts with the snap close of tripping mechanism;

Moving contact is pressed in by torsion spring on the end stop surface of swinging chute,

Release constitutes a module separately, is loaded on an end of pedestal.

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