CN204271012U - A kind of trip gear of circuit breaker - Google Patents

Abstract

A trip gear for circuit breaker, belongs to low voltage electrical apparatus technology field.Comprise electromagnetic mechanism and pedestal, pedestal is by yoke lid, yoke forms cage, electromagnetic mechanism is placed in cage, electromagnetic mechanism comprises dynamic iron core, coil, coil rack, plastic feet, divide magnetic sheet, permanent magnet and yoke cover, yoke is placed on the central authorities of yoke lid, coil is around on coil rack, one end of the hollow molded cavity of coil rack is sheathed on yoke and puts, a point magnetic sheet is established in the below of the other end, dynamic iron core is placed in the hollow molded cavity of coil rack, its upper end is inserted in yoke cover, permanent magnet is located at the below of point magnetic sheet, plastic feet has first, second cavity, be respectively used to place and location permanent magnet and point magnetic sheet, the assembly of this three is between coil rack and the base plate of yoke.Its make the shunt release of circuit breaker and magnetic flow convertor entirety general, and secondary enlarger general in device for under-voltage releasing equipment; Designs simplification, size is little; There is good diamagnetic interference performance.

Description

A kind of trip gear of circuit breaker

Technical field

The utility model belongs to low voltage electrical apparatus technology field, is specifically related to a kind of trip gear of circuit breaker.

Background technology

Circuit breaker trip gear, a class for being fixed on circuit breaker internal, as thermal overload release, one class is electromagnet, exist mainly with attachment version, add according to actual needs, as shunt release, device for under-voltage releasing equipment and the magnetic flow convertor as electronic trip unit execution unit.

Along with the miniaturization of breaker of plastic casing, the winding volume of shunt release, device for under-voltage releasing equipment and magnetic flow convertor reduces gradually, and electromagnetic energy is limited, is difficult to meet directly hit energy requirement or this energy of snap close that draw bar makes circuit breaker tripping.So in prior art, usually adopt secondary enlarger to provide circuit breaker tripping energy, electromagnetic energy is only for the energy of secondary enlarger of triping, discharge.

Shunt opening, device for under-voltage releasing equipment are all tripping device for circuit breaker, and the assembly relation between circuit breaker has the similitude of height, in actual design, many employing normalization designs, namely make two kinds of release overall structures similar, and adopt general purpose accessory as far as possible, thus reduce costs." a kind of circuit breaker device for under-voltage releasing equipment " disclosed in Chinese utility model patent Authorization Notice No. CN201449955U and the one " circuit breaker shunt release " involved by Chinese utility model patent Authorization Notice No. CN201417726Y, above-mentioned two kinds of releases, the snap close mode contrary by action logic in secondary enlarger (is triped during dynamic iron core adhesive, trip during dynamic iron core release), to adapt to work-based logic in both different electromagnetic mechanisms, namely the coil of shunt release obtains electric--dynamic iron core by adhesive--circuit breaker tripping, the coil losing electricity of device for under-voltage releasing equipment--dynamic iron core is released--circuit breaker tripping, both realizations secondary enlarger is substantially identical, can common sparing part.

The working method of the executive component magnetic flow convertor of electronic trip unit, is well known that: when coil no current, and permanent magnet moves iron core to the adhesive after the active force overcoming electromagnetic mechanism contained spring of the magnetic force of dynamic iron core; When the coil is energized, the flux portion of permanent magnet in dynamic iron core or be all cancelled, dynamic iron core discharges under contained spring effect, answers back to snap close piece, and release energy-stored spring energy, finally makes circuit breaker tripping.That is, the work-based logic relation of the magnetic flow convertor entirety circuit breaker tripping that is that coil obtains electric--dynamic iron core is released--.Visible, the electrical characteristic of magnetic flow convertor electromagnetic mechanism work is identical with shunt release, and (trip coil obtains electric, circuit breaker is threaded off), the logical relation of secondary enlarger work is identical with device for under-voltage releasing equipment (to be moved iron core to be released, circuit breaker is threaded off), namely magnetic flow convertor can realize the function of shunt release in theory, and realizes the secondary enlarger completely general with device for under-voltage releasing equipment, for the production cost of the similar trip gear reducing circuit breaker further provides possibility.

In the traditional design of magnetic flow convertor electromagnetic mechanism, the normal yoke adopting drum type structure, effectively improves the diamagnetic interference performance of the electromagnetic mechanism containing permanent magnet.For making the magnetic field that in coil, electric current produces reduce the demagnetizing action of permanent magnet and strengthen the regulating action of the permanent magnet suction that dynamic iron core is subject to, known mode arranges a point magnetic sheet.Patty in drum type yoke divides magnetic sheet, and the extended structure by magnetic flow convertor coil rack is located, and keeps the gap with yoke wall.

Compared with the hexahedron yoke built with steel plate common in device for under-voltage releasing equipment, the production cost of drum type yoke is higher, and the yoke structure difference of barrel shape yoke and device for under-voltage releasing equipment is large, and this is also unfavorable for increasing diamagnetic interference performance for reducing production cost; The difference degree in electromagnetic mechanism relative to shunt opening and device for under-voltage releasing equipment, the drum converter of magnetic flow convertor and the general purpose accessory number of device for under-voltage releasing equipment are difficult to realize.

To this, a kind of solution with feasibility is, the drum type yoke of magnetic flow convertor is replaced by hexahedron type, has both reduced the cost of magnetic flow convertor, increases again the general purpose accessory number of magnetic flow convertor and device for under-voltage releasing equipment.But, thus by the decline of the diamagnetic interference performance of electromagnetic mechanism in the magnetic flow convertor that causes, point magnetic sheet locate mode being applicable to drum type structure yoke is also not suitable in the yoke of hexahedron type, and this structure just needing to be optimized trip gear is to meet the demands.

Summary of the invention

The purpose of this utility model is the trip gear that will provide a kind of circuit breaker, its make the shunt release of circuit breaker and magnetic flow convertor entirety general, and secondary enlarger general in device for under-voltage releasing equipment; Number of parts reduces simultaneously, and structure is simplified, and overall dimensions reduces, and is applicable to the demand of circuit breaker miniaturization; And there is good diamagnetic interference performance.

The purpose of this utility model reaches like this, a kind of trip gear of circuit breaker, comprise electromagnetic mechanism and pedestal, pedestal is by yoke lid, yoke forms cage, described electromagnetic mechanism is placed in cage, described electromagnetic mechanism comprises dynamic iron core, coil, coil rack, plastic feet, divide magnetic sheet, permanent magnet and yoke cover, described yoke is placed on the central authorities of yoke lid, described coil winding is on coil rack, one end of the hollow molded cavity of described coil rack is sheathed on yoke and puts, the below of the other end is provided with a point magnetic sheet, described dynamic iron core is placed in the hollow molded cavity of described coil rack, its upper end is inserted in yoke cover, described permanent magnet is arranged on the below of point magnetic sheet, described plastic feet has the first cavity and the second cavity, be respectively used to place and location permanent magnet and point magnetic sheet, the assembly of this three is between coil rack and the base plate of yoke.

In a specific embodiment of the present utility model, described second cavity mates with a point magnetic sheet, and the degree of depth of this second cavity and a point magnetic sheet consistency of thickness, the edge enclosing of described second cavity ensures to divide the gap between magnetic sheet and the sidewall of yoke.

In another specific embodiment of the present utility model, described first cavity is arranged at the second recessed mesotropic bottom and mates with permanent magnet, and the degree of depth of this first cavity and permanent magnet consistency of thickness, the plastic bottoms of described first cavity ensures the distance between permanent magnet and the base plate of yoke.

In another specific embodiment of the present utility model, described trip gear also comprises secondary enlarger, described secondary enlarger comprises snap close, tripping, energy-stored spring and strike bar, described latch pivot is connected on pedestal, snap close one end has a lock hook, for being connected with tripping, the described snap close other end has an extension rod, the upper end that extension rod and release move iron core coordinates to realize the connection between electromagnetic mechanism and secondary enlarger, described tripping is pivotally connected on pedestal, described energy-stored spring one end is connected with tripping, one end is fixed on energy-stored spring connecting axle, described strike bar is pivotally connected in described tripping, one end is corresponding with the snap close of circuit breaker operation mechanism.

The utility model owing to adopting after said structure, the beneficial effect had: the lock hook ecto-entad of first described snap close fastens amplification draw bar, amplify draw bar when dynamic iron core release and trip, this action logic is identical with device for under-voltage releasing equipment; Described dynamic iron core is when coil no power by permanent magnet adhesive, and discharge under the counter-force effect of stored energy mechanism when the coil is energized, this electric logic is identical with shunt release.Therefore, if the utility model embodiment performs shunt release function, make the stored energy mechanism complete unity corresponding to device for under-voltage releasing equipment because snap close mode is identical, can general a whole set of stored energy mechanism.Further, trip gear described in the utility model embodiment can perform the function of magnetic flow convertor in circuit breaker.

Secondly, the yoke of described sheet metal component has the effect of magnetic circuit and electromagnet casing concurrently, and is integrated with the pedestal of stored energy mechanism, reduces the number of components of electromagnet, reduces the difficulty of processing of part.

3rd, described plastic feet location permanent magnet and a point magnetic sheet, ensure that permanent magnet and yoke base plate have a certain size gap, reduce the local magnetic saturation degree of yoke base plate, the electromagnetic interference resistivity of enhancing electromagnet.

4th, the compact conformation of release, overall dimensions significantly reduces, and is applicable to the circuit breaker that annex installing space is limited.

Accompanying drawing explanation

Fig. 1 is an embodiment three-dimensional structure diagram of the present utility model.

Fig. 2 is planar structure cutaway view embodiment illustrated in fig. 1.

Fig. 3 is the explosive view that plastic feet described in the utility model assembles with a point magnetic sheet, permanent magnet.

Fig. 4 is that the plane of plastic feet described in the utility model partly cuts open figure.

In figure: 1. electromagnetic mechanism, 11. dynamic iron cores, 111. upper ends, 1111. bonnet lock holes, 112. confined planes, 12. coils, 13. coil racks, 14. plastic feets, 141. first cavitys, 142. second cavitys, 143. foots, 15. points of magnetic sheets, 16. permanent magnets, 17. yoke covers; 2. secondary enlarger, 21. snap closes, 211. lock hooks, 212. extension rods, 22. trippings, 221. lugs, 222. open slots, 23. energy-stored springs, 231. energy-stored spring connecting axles, 24. hit bar, 241. boss, 242. gathering sills; 3. pedestal, 31. yoke lids, 32. yokes, 321. base plates, 322. sidewalls.

Embodiment

Technical spirit of the present utility model and beneficial effect can be fully understood in order to make the public; applicant will describe in detail embodiment of the present utility model below by reference to the accompanying drawings; but applicant is not the restriction to technical scheme to the description of embodiment, any changing in the form rather than substance according to the utility model design all should be considered as protection range of the present utility model.

Refer to Fig. 1 and composition graphs 2, the secondary enlarger of a kind of circuit breaker device for under-voltage releasing equipment of the utility model and shunt release, described circuit breaker device for under-voltage releasing equipment and shunt release comprise electromagnetic mechanism 1, secondary enlarger 2 and pedestal 3.Pedestal 3 comprises yoke lid 31, yoke 32, and described yoke and yoke lid 31 are riveted and formed hexahedron shell frame, and yoke lid 31 and yoke 32 are critical pieces of electromagnetic mechanism magnetic circuit, the shell of yoke 32 or whole trip gear.Described electromagnetic mechanism 1 is placed in cage, and described electromagnetic mechanism 1 has the release be connected with secondary enlarger and moves iron core 11.

Described electromagnetic mechanism also comprises coil 12, coil rack 13, base 14, point magnetic sheet 15, permanent magnet 16 and yoke cover 17, permanent magnet 16, point magnetic sheet 15, dynamic iron core 11, yoke cover 17, described yoke cover 17 is with yoke lid 31 close contact and be positioned at the central authorities of yoke lid 31 and be placed in the inner cavity top of described coil rack 13, the air gap magnetic resistance between dynamic iron core 11 and yoke lid 31 is reduced and leakage field minimizing.Described coil 12 is wrapped on coil rack 13, coil rack 13 central cavity one end is placed on yoke cover 17, the other end is provided with point magnetic sheet 15, dynamic iron core 11 can move along the cavity axial line of coil rack 13 through yoke cover 17 and be connected with secondary enlarger 2, preferably having projection at coil rack 13 carries out spacing to the assembling of dynamic iron core 11 and motion, also can carry out spacing to the assembling of dynamic iron core 11 and motion by yoke cover 17, and this dynamic iron core 11 is also by dividing the spacing of magnetic sheet 15, described permanent magnet 11 is arranged on the below of point magnetic sheet 15, described plastic feet 14 has the first cavity 141 and the second cavity 142, be respectively used to place and location point magnetic sheet 15 and permanent magnet 16, the assembly of this three is between coil rack 13 and the base plate 321 of yoke 32.

Refer to Fig. 3 and composition graphs 4, base 14 is designed with the first cavity 141 and the second cavity 142, be respectively used to assembling point magnetic sheet 15 and permanent magnet 16, described second cavity 142 mates with a point magnetic sheet 15, and the degree of depth of this second cavity 142 and point magnetic sheet 15 consistency of thickness, the edge enclosing of described second cavity 142 ensures to divide the gap between magnetic sheet 15 and the sidewall 322 of yoke 32.The bottom that described first cavity 141 is arranged at the second cavity 142 central authorities is mated with permanent magnet 16, and the degree of depth of this cavity 141 and permanent magnet 16 consistency of thickness, the plastic bottoms of described cavity 141 ensures the distance between permanent magnet 16 and the base plate 321 of yoke 32.By base 14 so expedients, realize ensureing the assembling of sidewall 322 gap length dividing magnetic sheet 15 and yoke 32, and the guarantee of the spacing of the base plate 321 of permanent magnet 16 and yoke 32.And the back-plane design of base 14 has foot 143, the base plate 321 of yoke 32 can be assemblied in, realize the fixing of base 14.The existence in gap between the base plate 321 of permanent magnet 16 and yoke 32, makes to occur leakage field between the sidewall 322 of permanent magnet 16 bottom surface and yoke 32, thus reduces the local magnetic saturation degree of the base plate 321 of yoke 32, improves the ability that electromagnet resists extraneous magnetic disturbance.

Please continue to refer to Fig. 1 and composition graphs 2, described secondary enlarger is placed between the two side 322 of yoke 32, and is positioned at outside cage, namely outside yoke lid 31.Described secondary enlarger comprises snap close 21, tripping 22, energy-stored spring 23 and strike bar 24, wherein said snap close 21 is pivotally connected on sidewall 322, snap close 21 one end has a lock hook 211, for being connected with tripping 22, described snap close 21 other end has an extension rod 212, T-shaped large in little bottom, top of described dynamic iron core 11, upper, lower intersection is formed with a confined planes 112, the upper end 111 that release moves iron core 11 offers a bonnet lock hole 1111 for being connected with described snap close 21, the extension rod 212 of described snap close 21 inserts in bonnet lock hole 1111, thus realize the connection that release moves iron core 11 and snap close 21.Described tripping 22 is pivotally connected on sidewall 322, described tripping 22 is formed with a lug 221, the position of this lug 221 is corresponding with the position that described release moves iron core 11, move iron core 11 for helping release under small area analysis air gaps to be moved to attracted position by off-position, the lug 221 in described tripping 22 both can be bending part also can be stamping parts.Described tripping 22 offers a square groove 222, the position of this square groove 222 is corresponding with the position that described release moves iron core 11, moves iron core 11 for avoiding described release during snap close.Described energy-stored spring 23 one end is connected with tripping 22, one end is fixed on energy-stored spring connecting axle 231, described energy-stored spring connecting axle 231 is arranged on sidewall 322, described strike bar 24 is pivotally connected in described tripping 22, one end of described strike bar 24 is formed with one for corresponding with circuit breaker operating handle position for realizing the boss 241 cooperatively interacted between the two, and the other end is corresponding with the snap close of circuit breaker operation mechanism.The vertical direction of described strike bar 24 has a gathering sill 242, have in described gathering sill 242 and to hit bar 24 described in a pair and play the guiding role and make to hit the locating shaft 25 that bar 24 can only move up and down, described locating shaft 25 is fixed on described sidewall 322.

When dynamic iron core 11 adhesive, the extension rod 212 of its upper end to snap close 21 has position-limiting action, and make snap close 21 pairs of trippings 22 provide latching force, energy-stored spring 23 is in energy storage state; Electromagnetic force reduces and is less than the reaction force that energy-stored spring 23 provides suffered by the dynamic iron core 11, dynamic iron core 11 discharges, extension rod 212 position-limiting action of snap close 21 is weakened, snap close 21 is Unscrew under the counter-force effect by the tripping 22 directly acted on by energy-stored spring 23, tripping 22 is no longer subject to the spacing of the lock hook of snap close 21, rotate under the effect of energy-stored spring 23, and drive strike bar 24 to move, complete the trip action of trip gear.

When current vanishes in coil 12, dynamic iron core 11 is by the magneticaction adhesive again automatically of permanent magnet 16, or tripping 22 rotates by External Force Acting when breaker mechanism is detained again, the lug 221 of tripping 22 produces booster action to dynamic iron core 11 upper end 111, makes iron core 11 more reliably by permanent magnet 16 again adhesive.Now, the upper end 111 of dynamic iron core 11 produces strong position-limiting action to the extension rod 212 of snap close 21 again.

When breaker mechanism is detained again, known technology can realize the booster action of breaker mechanism to tripping 22.Under this booster action, tripping 22 rotates, until contact with latch hook 211 lateral surface of snap close 21 and produce thrust to it, then overcome because of permanent magnet 16 to the dynamic suction of iron core 11 position-limiting action of the extension rod 212 to snap close 21, snap close 21 is to inner rotary until the end of tripping 22 enters the bottom of lock hook 211 completely.Then, snap close 21 again under the effect of the dynamic iron core 11 by permanent magnet 16 suction reverse rotation inside, and therefore position-limiting action is produced to the end of tripping 22.Under energy-stored spring 23 is locked in energy storage state by limit.

In stored energy mechanism, latch hook 211 ecto-entad of described snap close 21 fastens tripping 22, and when dynamic iron core 11 discharges, tripping 22 is triped, and this action logic is identical with device for under-voltage releasing equipment in the past, namely identical snap close mode.In electromagnetic mechanism, described dynamic iron core 11, is discharged when coil 12 is energized by permanent magnet 16 adhesive when coil 12 no power under the counter-force effect of secondary enlarger 2, electrical action logical AND shunt release so identical.Therefore, what the utility model embodiment can be preferential performs shunt release function in circuit breaker.In conjunction with the secondary enlarger 2 of the special snap close mode of the utility model patent, now the secondary enlarger 2 of shunt opening and device for under-voltage releasing equipment is completely unified, can be overall general.

The operation principle of the utility model shunt release is described according to Fig. 1-Fig. 4:

When coil 12 no power, under now dynamic iron core 11 is in air gaps, the suction of permanent magnet 16 is not enough to make iron core 11 put motion from off-position to bat co-bit.Now, if there is motion of closing a floodgate in circuit breaker, the handle (known technology does not indicate) of circuit breaker operation mechanism contacts with the boss 241 hitting bar 24 one end, promote to hit bar 24 to move downward, drive tripping 22 to rotate clockwise simultaneously, after tripping 22 turns over certain angle, lug 221 in tripping 22 contacts with dynamic iron core 11, promote dynamic iron core 11 to move downward, dynamic iron core 11 is passed by after certain stroke, under the suction of permanent magnet 16, dynamic iron core 11 continues to move downward and rests on bat co-bit to be put, simultaneously under the effect of dynamic iron core 11, snap close 21 is rotated counterclockwise and rests on recombination site, tripping 22 is pinned by the latch hook 211 of snap close 21.The moment that dynamic iron core 11 pairs of snap closes 21 apply is counterclockwise, the moment that tripping 22 pairs of snap closes 21 apply is clockwise direction, the anticlockwise moment that dynamic iron core 11 pairs of snap closes 21 apply is greater than the clockwise moment that tripping 22 pairs of snap closes 21 apply, so snap close 21 remains on snap close position, secondary enlarger is by energy storage, shunt release is in energy storage state, and circuit breaker can normally work.

When shunt release coil 12 is energized, dynamic iron core 11 produces the magnetic flux contrary with permanent magnet 16, the electromagnetic attraction that dynamic iron core 11 is subject to reduces, the anticlockwise moment that dynamic iron core 11 pairs of snap closes 21 apply is less than the clockwise moment that tripping 22 pairs of snap closes 21 apply, snap close 21 turns clockwise, lock hook 211 on snap close 21 departs from the cooperation of tripping 22, and secondary enlarger unlocks.Under the effect of energy-stored spring 23, tripping 22 is rotated counterclockwise, and drives strike bar 24 upwards to run, hits the snap close (known technology does not indicate) that bar 24 hits the operating mechanism of circuit breaker, make breaker open operation.

Claims (4)

1. a kind of trip gear of circuit breaker, comprise electromagnetic mechanism (1) and pedestal (3), pedestal (3) is by yoke lid (31), yoke (32) forms cage, described electromagnetic mechanism (1) is placed in cage, it is characterized in that: described electromagnetic mechanism (1) comprises dynamic iron core (11), coil (12), coil rack (13), plastic feet (14), divide magnetic sheet (15), permanent magnet (16) and yoke cover (17), described yoke cover (17) is placed in the central authorities of yoke lid (31), described coil (12) is wrapped on coil rack (13), one end of the hollow molded cavity of described coil rack (13) is sheathed on yoke cover (17), the below of the other end is provided with a point magnetic sheet (15), described dynamic iron core (11) is placed in the hollow molded cavity of described coil rack (13), its upper end is inserted in yoke cover (17), described permanent magnet (11) is arranged on the below of a point magnetic sheet (15), described plastic feet (14) has the first cavity (141) and the second cavity (142), be respectively used to place and location permanent magnet (16) and point magnetic sheet (15), the assembly of this three is positioned between the base plate (321) of coil rack (13) and yoke (32).

2. the trip gear of a kind of circuit breaker according to claim 1, it is characterized in that described second cavity (142) is mated with a point magnetic sheet (15), and the degree of depth of this second cavity (142) and point magnetic sheet (15) consistency of thickness, the edge enclosing of described second cavity (142) ensures to divide the gap between magnetic sheet (15) and the sidewall (322) of yoke (32).

3. the trip gear of a kind of circuit breaker according to claim 1, it is characterized in that the bottom that described first cavity (141) is arranged at the second cavity (142) central is mated with permanent magnet (16), and the degree of depth of this first cavity (141) and permanent magnet (16) consistency of thickness, the plastic bottoms of described first cavity (141) ensures the distance between permanent magnet (16) and the base plate (321) of yoke (32).

4. the trip gear of a kind of circuit breaker according to claim 1, it is characterized in that described trip gear also comprises secondary enlarger (2), described secondary enlarger (2) comprises snap close (21), tripping (22), energy-stored spring (23) and strike bar (24), described snap close (21) is pivotally connected on pedestal (3), snap close (21) one end has a lock hook (211), for being connected with tripping (22), described snap close (21) other end has an extension rod (212), the upper end (111) that extension rod (212) and release move iron core (11) coordinates to realize the connection between electromagnetic mechanism and secondary enlarger, described tripping (22) is pivotally connected on pedestal (3), described energy-stored spring (23) one end is connected with tripping (22), one end is fixed on energy-stored spring connecting axle (231), described strike bar (24) is pivotally connected in described tripping (22), one end is corresponding with the snap close of circuit breaker operation mechanism.