CN209232654U - A kind of arc extinguishing structure of breaker of plastic casing - Google Patents

Abstract

The utility model relates to a kind of arc extinguishing structures of breaker of plastic casing, belong to technical field of electrical components, it includes circuit breaker base and the multiple arc extinguishing units for being juxtaposed on base interior, be characterized in that: the pedestal corresponds to arc extinguishing unit and offers multiple mounting grooves for being used to install arc extinguishing unit, static contact is fixed in the mounting groove, the installation trench bottom offers the airslide through pedestal.The utility model proposes a kind of breaker of plastic casing arc extinguishing structure, by offering airslide on the base, partial heat energy amount can reduce the destruction to pedestal as air-flow is discharged from airslide.

Description

A kind of arc extinguishing structure of breaker of plastic casing

Technical field

The utility model relates to technical field of electrical components, more particularly, to a kind of arc extinguishing structure of breaker of plastic casing.

Background technique

Electric arc belongs to a kind of form of gas discharge, contains in the medium around device for switching contact itself and contact a large amount of The electronics that can be dissociated, when the moment for closing the switch or disconnecting, there are sufficiently large applied voltages between contact and contact, and And circuital current just will form electric arc when also reaching most your pupil's arc current, electric arc not only has very big destruction to contact, and And extend the time of disconnecting circuit.It will cause electric appliance damage very if cannot especially power off in time in line failure To the safety for leading to fire, crisis personnel and equipment, therefore must all have arc quenching system in breaker.

Arc extinguishing ability of the structural relation of arc quenching system to breaker.And arc extinguishing ability is directly related to the disjunction of breaker Ability, and electric arc and pressure high temperature hot gas are also relate to for circuit breaker internal structural damage, and this destroys and directly closes It is the service life to breaker.Existing arc quenching system mostly uses the setting grid formula arc-chutes on circuit breaker housing pedestal, Electric arc is divided into many series connection short arcs by arc extinguishing indoor arc extinguishing grid pieces, so that the volume voltage drop on electric arc increases, thus Prevent electric arc extinguishes rapidly from maintaining burning.But during arc-chutes arc extinguishing, electric arc can generate a large amount of heat, when The indoor thermal energy of arc extinguishing, which reaches certain energy, to damage the pedestal of breaker, influence the service life of breaker.

Therefore it needs to propose the new technical solution of one kind to solve above-mentioned technical problem.

Utility model content

The purpose of the utility model is to provide a kind of arc extinguishing structures of breaker of plastic casing, by offering air-flow on the base Slot, partial heat energy amount can be as air-flow be from airslide discharge, so that the indoor temperature of arc extinguishing is reduced, to reduce heat to pedestal It destroys.

The above-mentioned purpose of utility model of the utility model has the technical scheme that

A kind of arc extinguishing structure of breaker of plastic casing, including circuit breaker base and the multiple arc extinguishings for being juxtaposed on base interior Unit, the pedestal correspond to arc extinguishing unit and offer multiple mounting grooves for being used to install arc extinguishing unit, fix in the mounting groove Equipped with static contact, the installation trench bottom offers the airslide through pedestal.

It is brave to be arranged in base interior according to the structure setting arc extinguishing structure of breaker by using above-mentioned technical proposal The electric arc that arc extinguishing unit generates breaker open or closed moment extinguishes；Setting mounting groove static contact is mounted on mounting groove It is interior, enable arc extinguishing unit is more stable to be quickly mounted in circuit breaker base, setting airslide enables portion gas It is discharged out of airslide, the gas of discharge takes partial heat out of, so that the indoor temperature of arc extinguishing reduces, to reduce electric arc production Destruction of the raw heat to pedestal.

The utility model is further arranged to: there are gap between the airslide and static contact, the static contact is connect The conductive plate being obliquely installed is equipped between contravention and its terminals.

By using above-mentioned technical proposal, since static contact is mounted on installation trench bottom, by setting conductive plate and utilize The tilt angle of conductive plate makes between static contact and airslide that there are gaps, so that gas can be between the two It is discharged at gap.

The utility model is further arranged to: the arc extinguishing unit includes the grid formula arc-chutes being inserted in mounting groove, The arc-chutes include two pieces of flash barriers being oppositely arranged and several arc extinguishing grid pieces for being mounted between two pieces of flash barriers.

Electric arc is split using muti-piece arc extinguishing grid pieces, is made by the way that arc-chutes are arranged by using above-mentioned technical proposal The voltage drop obtained on electric arc increases exponentially, prevent electric arc is off rapidly from maintaining burning.

The utility model is further arranged to: the arc extinguishing unit further includes being fastened on arc-chutes towards moving contact side Arc-extinguish chamber, the arc-extinguish chamber are made of gas exhausted material；The arc-extinguish chamber includes that the riser parallel with flash barrier and being set to goes out Transverse slat above arc grid, the through slot that the riser is equipped with vertically for moving contact sliding.

By using above-mentioned technical proposal, the arc extinguishing ability of arc-chutes is improved by setting arc-extinguish chamber, arc-extinguish chamber is using production Gas material is made, and when electric arc generates, arc-extinguish chamber can generate gas under arcing, accelerate the compound of arc ions, produce simultaneously Raw gas can form very big air-blowing power to electric arc, to drive electric arc to rapidly enter in arc extinguishing grid pieces；Simultaneously by setting riser It opens up through slot to protect arc extinguishing grid pieces towards moving contact under the activity for not influencing moving contact, be arranged above second gate piece Transverse slat is obstructed between the second grid and circuit breaker housing, protective breaker shell；Pass through setting arc-extinguish chamber and breaker Clamping is convenient to replace arc-extinguish chamber.

The utility model is further arranged to: the arc extinguishing grid pieces include and striking grid, the first grid close to static contact Piece and the second grid, the striking grid are equipped with the striking block contradicted with static contact towards static contact side.

By using above-mentioned technical proposal, electric arc is introduced in arc-chutes by setting striking grid, striking block pair is set Electric arc is oriented to, and electric arc is entered in arc-chutes.

The utility model is further arranged to: the striking block and conductive plate contradict, and the striking block and conductive plate contradict It holds contour with the contact jaw of static contact.

By using above-mentioned technical proposal, striking block and the contact jaw that conductive plate contradicts end and static contact are contour so that electric arc Reduce into the indoor distance of arc extinguishing, so that electric arc can quickly enter in arc-chutes.

The utility model is further arranged to: the two sides that the static contact corresponds to airslide offer escape groove.

By using above-mentioned technical proposal, by the way that escape groove is arranged the gap between flash barrier and static contact is increased, The gas above static contact is facilitated to flow out from airslide.

The utility model is further arranged to: the arc extinguishing grid pieces are equipped with arc notch away from the both ends of moving contact side.

By using above-mentioned technical proposal, arc notch is set and makes arc extinguishing grid pieces away from moving contact side both ends and arc Spacing between plate increases, and the gas of discharge in arc extinguishing grid pieces is quickly discharged；Since arc notch is in arc Shape so that spacing between arc extinguishing grid pieces and flash barrier it is as big as possible while being opened, reduce arc extinguishing grid pieces area and reduce Amount guarantees arc quenching effect.

In conclusion the advantageous effects of the utility model are as follows: airslide is arranged in installation trench bottom, is discharged in gas The heat that gas carries when airslide is also pulled away, so that the indoor heat of arc extinguishing is reduced, reduces what arc burning generated Damage of the heat to pedestal；By the way that inclined arc extinguishing grid pieces are arranged, on the basis of not increasing arc extinguishing grid pieces quantity, so that arc extinguishing The length of grid can be increased, to increase the area that electric arc is contacted with arc extinguishing grid pieces, increase electric arc on arc extinguishing grid pieces Movement and cooling time, to improve the breaking capacity of breaker；The arc extinguishing ability of arc-chutes is improved by setting arc-extinguish chamber, Shorten the quenching time, it is impaired to reduce breaker.

Detailed description of the invention

Fig. 1 is the overall structure diagram of the utility model；

Fig. 2 is the partial sectional view of the utility model, mainly shows the installation site relationship of arc extinguishing unit on the base；

Fig. 3 is the partial structure diagram of the utility model, mainly shows the relationship between arc-chutes and arc-extinguish chamber；

Fig. 4 is the partial structure diagram of the utility model, mainly shows arrangement of the arc extinguishing grid pieces on flash barrier.

In figure, 1, pedestal；11, mounting groove；12, airslide；2, arc extinguishing unit；3, static contact；31, conductive plate；32, it avoids Slot；4, arc-chutes；41, flash barrier；411, biting teeth hole；42, arc extinguishing grid pieces；421, striking grid；4211, striking mouth；4212, Striking block；422, the first grid；4221, the first arc extinguishing mouth；423, the second grid；4231, the second arc extinguishing mouth；424, arc lacks Mouthful；425, fixed tooth block；5, arc-extinguish chamber；51, riser；511, through slot；52, transverse slat；53, plate is contradicted.

Specific embodiment

The utility model is described in further detail below in conjunction with attached drawing.

Embodiment:

It referring to Fig.1, is a kind of arc extinguishing structure of breaker of plastic casing disclosed by the utility model, including 1 He of circuit breaker base The multiple arc extinguishing units 2 being juxtaposed on inside pedestal 1, the corresponding arc extinguishing unit 2 of pedestal 1 offer multiple for installing arc extinguishing list The mounting groove 11 of member 2 is fixed with static contact 3 in mounting groove 11.Arc extinguishing unit 2 is arranged above static contact 3, when breaker is disconnected It opens or connects moment, the electric arc of 2 pairs of arc extinguishing unit generations extinguishes.

Referring to Fig. 2, it is discharged for convenience of the heat for generating arc extinguishing unit 2 during arc extinguishing, avoids heat excessively high and make Pedestal 1 damages, 11 bottom of mounting groove offers the airslide 12 through pedestal 1, enables heat with air-flow from airslide 12 discharges.Since static contact 3 is mounted on 11 bottom of mounting groove, it is discharged to avoid static contact 3 from influencing gas from airslide 12, stationary contact It is equipped with the conductive plate 31 being obliquely installed between first 3 contact jaw and the terminals of static contact 3, utilizes the tilt angle of conductive plate 31 So that there are gaps between static contact 3 and airslide 12, so that gas can be discharged from gap location between the two.

Referring to Figures 1 and 2, arc extinguishing unit 2 includes the grid formula arc-chutes 4 being inserted in mounting groove 11 comprising two pieces The flash barrier 41 being oppositely arranged and several arc extinguishing grid pieces 42 being mounted between two pieces of flash barriers 41, due to flash barrier 41 and installation 11 grafting of slot, the gas to avoid flash barrier 41 from influencing 3 top of static contact are discharged from airslide 12, the corresponding airslide of static contact 3 12 two sides offer escape groove 32, so that the spacing between static contact 3 and flash barrier 41 increases, to facilitate on static contact 3 The gas of side, which is flowed by escape groove 32 to airslide 12, to be discharged,

Referring to Fig. 2 and Fig. 4, arc extinguishing grid pieces 42 include striking grid 421, the first grid of muti-piece 422 close to static contact 3 Three pieces are shown as in (being shown as three pieces in figure) and muti-piece the second grid 423(figure), electric arc is introduced arc-chute by striking grid 421 In piece 42, electric arc is divided into multiple short arcs under the barrier of the first grid 422 and the second grid 423 and carries out arc extinguishing processing. To guarantee that short arc can be moved and be cooled down rapidly in the gap between arc extinguishing grid pieces 42, arc extinguishing grid pieces 42 are inclined to set And tilted down towards moving contact direction, on the basis of not increasing by 42 quantity of arc extinguishing grid pieces, increase electric arc and arc extinguishing grid pieces 42 The area of contact, i.e. increase electric arc move on arc extinguishing grid pieces 42 and the cooling time, to improve the breaking capacity of breaker.

Referring to Fig. 2 and Fig. 4, during arc extinguishing, the arc energy close to 3 end of static contact is greater than far from static contact 3 electric arc The arc energy at end, to improve arc quenching effect, between 423 three of striking grid 421, the first grid 422 and the second grid Tilt angle is sequentially increased.The tilt angle of striking grid 421 less than the first grid 422 tilt angle so that striking grid It is formed by slit width increase between 421 first grid 422 adjacent thereto, electric arc is facilitated to enter between the first grid 422；First The tilt angle of grid 422 less than the second grid 423 tilt angle so that adjacent two piece of first grid 422 and the second grid Spacing between 423 increases, and electric arc is facilitated to enter between the second grid 423 from the first grid 422.

Referring to Fig. 4, to guarantee that electric arc quickly can be moved and be cooled down in the gap between arc extinguishing grid pieces 42, each arc-chute Spacing between piece 42 cannot be too small, since the tilt angle of striking grid 421 is less than the tilt angle of the first grid 422, makes Between spacing between first grid 422 adjacent thereto of striking grid 421 is greater than between adjacent two piece of first grid 422 Away from；The tilt angle of first grid 422 less than the second grid 423 tilt angle so that the first grid 422 it is adjacent thereto Spacing between two grid 423 is greater than the spacing between adjacent two piece of second grid 423, is not increasing three piece first to realize While spacing between spacing and three piece of second grid 423 between grid 422, guarantee that electric arc can be quickly in arc extinguishing grid pieces It is moved between 42.

Referring to Fig. 2 and Fig. 4, the first grid 422 offers the first arc extinguishing mouth 4221, the second grid towards moving contact side 423 offer the second arc extinguishing mouth 4231 towards moving contact side, pass through the first arc extinguishing mouth 4221 of setting and the second arc extinguishing mouth 4231 Electric arc is elongated Yin Ru be in the gap between arc extinguishing grid pieces 42.First arc extinguishing mouth 4221 and the second arc extinguishing mouth 4231 are in certain Radian arrangement setting, and the depth of the first arc extinguishing mouth 4221 is greater than the depth of the second arc extinguishing mouth 4231, arc extinguishing grid pieces 42, the first grid The equal length of piece 422 and the second grid 423, so that the area of the outlet plate of the second grid 423 is greater than the first grid 422 Area guarantees electric arc the so that the area that contacts with the second grid 423 of electric arc is greater than the area with the first grid 422 Can preferably it be extinguished in two grid 423.

Referring to Fig. 2 and Fig. 4, since electric arc is to generate its direction of moment uncertain, striking grid 421 is towards moving contact side Equipped with striking mouth 4211, and the bottom of striking mouth 4211 is equipped with and contradicts striking block 4212 with moving contact, and striking block 4212 is set to Striking grid 421 is integrally formed away from 422 side of the first grid and with striking grid 421；Striking block 4212 is supported with conductive plate 31 Touching and striking block 4212 and conductive plate 31 contradict end and the contact jaw of static contact 3 is contour, shortening electric arc enter in arc-chutes 4 away from From enabling electric arc to quickly enter in arc-chutes 4.To guarantee that electric arc smoothly can enter the first arc extinguishing mouth from striking mouth 4211 In 4221, striking block 4212 is placed in 4221 bottom front of the first arc extinguishing mouth, and electric arc is enabled to enter the first arc extinguishing mouth 4221 When, not by the obstruction of the first grid 422.

Referring to Fig. 2 and Fig. 4, since a large amount of heat can be generated during arc extinguishing, to guarantee that arc-chutes 4 have enough heat dissipations Space, arc extinguishing grid pieces 42 are equipped with arc notch 424 away from the both ends of moving contact side, so that arc extinguishing grid pieces 42 deviate from moving contact one Spacing between side both ends and flash barrier 41 increases, so that the gas being discharged in arc extinguishing grid pieces 42 can be arranged quickly Out.The upper end end face of flash barrier 41 be higher than arc extinguishing grid pieces 42 so that arc-chutes 4 while not influencing breaker other function its Upper space increases, so that there are enough safe spaces between arc extinguishing grid pieces 42 and breaker casing.

Referring to Fig. 2 and Fig. 3, the two sides of arc extinguishing grid pieces 42 are equipped with fixed tooth block 425, the corresponding fixed tooth block 425 of flash barrier 41 Biting teeth hole 411 is offered, fixed tooth block 425 is interference fitted with biting teeth hole 411 so that fixed arc extinguishing grid pieces 42 and flash barrier 41 are fixedly connected.425 numbers of fixation tooth block of 42 two sides of arc extinguishing grid pieces are respectively one and two, to guarantee the strong of flash barrier 41 Degree avoids the flash barrier 41 when fixed tooth block 425 snaps fit onto biting teeth hole 411 from rupturing, between adjacent two pieces of arc extinguishing grid pieces 42 The number of the fixation tooth block 425 of its same side is staggered, so that the interval between the biting teeth hole 411 on flash barrier 41 increases Greatly, to enhance the intensity of flash barrier 41.

Referring to Figures 1 and 2, arc extinguishing unit 2 further includes being fastened on arc-extinguish chamber 5 of the arc-chutes 4 towards moving contact side, arc extinguishing Cover 5 is made of gas exhausted material；When electric arc generates, arc-extinguish chamber 5 can generate gas under arcing, accelerate answering for arc ions The gas for closing, while generating can form very big air-blowing power to electric arc, to drive electric arc to rapidly enter in arc extinguishing grid pieces 42, to mention High arc quenching effect.Since electric arc has certain corrosivity to arc-extinguish chamber 5, arc-extinguish chamber 5 is detachably arranged with breaker, side Just arc-extinguish chamber 5 is replaced.

Referring to Fig. 2 and Fig. 3, arc-extinguish chamber 5 includes the riser 51 parallel with flash barrier 41 and is set to 423 top of the second grid Transverse slat 52, riser 51 is equipped with the through slot 511 that slides for moving contact vertically, to arc-chute under the activity for not influencing moving contact Piece 42 is protected towards moving contact；Transverse slat 52 is set to 423 top of the second grid, to the second grid 423 and circuit breaker housing Between obstructed, protective breaker shell and other operating mechanisms.51 two sides of riser are equipped with towards arc extinguishing grid pieces 42 and contradict plate 53, it contradicts plate 53 and 42 end face of arc extinguishing grid pieces contradicts, so that arc-extinguish chamber 5 is during installation, end of the riser 51 towards moving contact side Face and flash barrier 41 are towards the end face of moving contact side, and the interval between arc extinguishing grid pieces 42 and riser 51 increases, to increase The heat-dissipating space of big arc extinguishing grid pieces 42.

Referring to Fig. 2 and Fig. 4, since the depth of the first arc extinguishing mouth 4221 is greater than the depth of the second arc extinguishing mouth 4231, arc extinguishing block 4221 bottom front of the first arc extinguishing mouth, the first arc extinguishing mouth 4221 and the second arc extinguishing mouth 4231 is set to arrange in camber line, and arc extinguishing The equal length of grid 42, therefore the end of arc striking piece towards moving contact side protrudes from the first grid 422, the first grid 422 The second grid 423 is protruded from towards the end of moving contact side；It is contradicted due to contradicting plate 53 and arc extinguishing grid pieces 42, contradicts plate 53 deviate from the curved setting in 51 side of riser.

The implementation principle of the present embodiment are as follows: when the moment electric arc generation that moving contact and static contact 3 are opened or closed, striking block 4212 guide electric arc into striking grid 421, and electric arc is along striking mouth 4211 to the seam between striking grid 421 and the first grid 422 Movement in gap.Electric arc during the motion, is separated into multiple short arcs by the first grid 422 and the second grid 423 and carries out arc extinguishing. The portion gas and partial heat that electric arc is generated in arc extinguishing are discharged from arc extinguishing grid pieces 42 away from the outlet side of moving contact side, part Gas and partial heat are flowed out from airslide 12.While electric arc generates, arc-extinguish chamber 5 generates gas and is formed under arcing Air-blowing power drives electric arc to rapidly enter in arc extinguishing grid pieces 42, while under the protection of riser 51 and transverse slat 52, avoiding electric arc to short Shell, moving contact and other operating mechanisms of road device cause to corrode.

The embodiment of present embodiment is the preferred embodiment of the utility model, and not limitation is originally practical new according to this The protection scope of type, therefore: the equivalence changes that all structures, shape, principle according to the utility model are done should all be covered by practical Within novel protection scope.

Claims (8)

1. a kind of arc extinguishing structure of breaker of plastic casing including circuit breaker base (1) and is juxtaposed on the multiple of pedestal (1) inside Arc extinguishing unit (2), it is characterised in that: the pedestal (1) corresponding arc extinguishing unit (2) offers multiple for installing arc extinguishing unit (2) mounting groove (11), the mounting groove (11) is interior to be fixed with static contact (3), and the mounting groove (11) offers through base The airslide (12) of seat (1).

2. a kind of arc extinguishing structure of breaker of plastic casing according to claim 1, it is characterised in that: the airslide (12) with There are gap between static contact (3), the contact jaw and terminals of the static contact (3) are equipped with the conductive plate (31) being obliquely installed.

3. a kind of arc extinguishing structure of breaker of plastic casing according to claim 2, it is characterised in that: the arc extinguishing unit (2) Including the grid formula arc-chutes (4) being inserted in mounting groove (11), the arc-chutes (4) include two pieces of flash barriers being oppositely arranged (41) and several arc extinguishing grid pieces (42) for being mounted between two pieces of flash barriers (41).

4. a kind of arc extinguishing structure of breaker of plastic casing according to claim 3, it is characterised in that: the arc extinguishing unit (2) It further include being fastened on arc-extinguish chamber (5) of the arc-chutes (4) towards moving contact side, the arc-extinguish chamber (5) is made of gas exhausted material； The arc-extinguish chamber (5) includes the riser parallel with flash barrier (41) (51) and the transverse slat that is set to above arc extinguishing grid pieces (42) (52), the riser (51) is equipped with the through slot (511) slided for moving contact vertically.

5. a kind of arc extinguishing structure of breaker of plastic casing according to claim 3, it is characterised in that: the arc extinguishing grid pieces (42) Including striking grid (421), the first grid (422) and the second grid (423) with close static contact (3), the striking grid (421) the striking block (4212) contradicted with static contact (3) is equipped with towards static contact (3) side.

6. a kind of arc extinguishing structure of breaker of plastic casing according to claim 5, it is characterised in that: the striking block (4212) It is contradicted with conductive plate (31), the striking block (4212) contradicts end with conductive plate (31) and the contact jaw of static contact (3) is contour.

7. a kind of arc extinguishing structure of breaker of plastic casing according to claim 1, it is characterised in that: the static contact (3) is right The two sides above airslide (12) are answered to offer escape groove (32).

8. a kind of arc extinguishing structure of breaker of plastic casing according to claim 3, it is characterised in that: the arc extinguishing grid pieces (42) Both ends away from moving contact side are equipped with arc notch (424).