CN201417721Y

CN201417721Y - Electromagnetic short circuit protecting device of circuit breaker

Info

Publication number: CN201417721Y
Application number: CN2009200428926U
Authority: CN
Inventors: 吴海霞; 陈志刚; 唐维春; 王炯华; 管瑞良
Original assignee: Changshu Switchgear Manufacturing Co Ltd
Current assignee: Changshu Switchgear Manufacturing Co Ltd
Priority date: 2009-06-08
Filing date: 2009-06-08
Publication date: 2010-03-03
Anticipated expiration: 2019-06-08

Abstract

An electromagnetic short circuit protecting device of circuit breaker belongs to the technical field of low-voltage electric appliances, which comprises a draw rod seat which is mounted on the casingwall of an arc-extinguishing chamber casing of a circuit breaker, and is provided with a draw rod cavity, an elastic element which is arranged in the draw rod cavity, a floating piece which is matchedwith the draw rod cavity in a sliding way and is matched with a hasp foot of the hasp of an operating mechanism of a circuit breaker, an iron core which is mounted on the arc-extinguishing chamber casing and is correspondingly mounted on the lower portion of the static contact arranged on the arc-extinguishing chamber casing, and an armature which is fixed in the floating piece and corresponds tothe upper portion of the iron core. The electromagnetic short circuit protecting device has the advantages of reducing occupied space, improving the reliability and the stability of the circuit breaker, and assuring the personal safety and circuit and power supply equipment safety, simultaneously guaranteeing the inside to be insulated and horizontal, and particularly having excellent operation safety when opening the upper cover of the circuit breaker to repair or change internal accessories.

Description

Electromagnetic short current protective device for breaker

Technical field

The utility model belongs to the low voltage electrical apparatus technology field, is specifically related to a kind of electromagnetic short current protective device for breaker, is used to activate the snap close of circuit breaker operation mechanism, makes circuit breaker trip.

Background technology

Breaker of plastic casing is applicable in the low voltage power distribution network, is used to distribute electric energy and protective circuit, power supply and power consumption equipment, and circuit breaker has overload, short circuit and under-voltage protection function, uses the damage of avoiding circuit and power-supply device.Industry is known, and the length of short-circuit protection operate time can directly influence the breaking capacity of circuit breaker.

In existing rotary dual-interruption point breaker; the structure of back level short-circuit protection generally includes: short circuit adjusting knob, short circuit adjusting rod and push rod; when short circuit takes place; yoke attracts armature; armature overcomes counter-force and promotes the short circuit adjusting rod; by the short circuit adjusting rod push rod is discharged, the snap close (also claiming snap close) by the push rod promotion circuit breaker operation mechanism that discharges disconnects circuit breaker.Obvious, make the snap close action of circuit breaker operation mechanism, must do transition by push rod, that is to say that push rod taking on the bridge between short circuit adjusting rod and the snap close or claiming the effect of transition member, can not directly activate snap close by the short circuit adjusting rod.Therefore, the form that activates snap close shows as indirect type, just because of the indirect actuating mode that has the push rod transition, thereby cause armature movement to push rod, and then can't shorten by the time that push rod promotes the snap close of circuit breaker operation mechanism, the shortcoming that is caused is: the low and poor stability of reliability that makes the circuit breaker open circuit on the one hand; Be not enough to reduce short circuit on the other hand to personal safety, influence that circuit and power-supply device caused.And for the electronic trip unit of electronic breaker; the operate time of electronic trip unit is also longer than the operate time of aforesaid back level short-circuit protection; because instantaneous operation will be through the processing of a series of signal of telecommunication; and then send signal and trigger circuit breaker tripping for the electronic type tripping relay, thereby make the shortcoming of aforesaid two aspects more outstanding.

At above-mentioned shortcoming, it is the air-blowing trip gear that industry is provided with quick-tripping device at the arc control device mechanism place of circuit breaker usually, concrete technological means is to handle circuit breaker trip in the mode of blowing, the gas that is adopted of blowing is to form like this: when short circuit condition takes place, dynamic/static contact is scolded out (moving contact leaves fixed contact) because of the effect of electrodynamic repulsion force, produce electric arc, under the effect of electric arc, both sides dividing plate in the arc control device and two split type binding foot discharge gas rapidly, air in the arc control device is expanded rapidly, gas pressure in the arc control device is raise suddenly, gas promotes to hit bar by the gas passage in the arc control device, hits the snap close of circuit breaker operation mechanism by the strike bar again, thereby makes the snap close action of circuit breaker operation mechanism, circuit breaker trip, disengagement failure electric current (short circuit current).With regard to the speed that the snap close that activates circuit breaker operation mechanism moves, this quick-tripping device can be obviously faster than described back level short-circuit protection.But there is certain defective in above-mentioned air-blowing trip gear; because; the sealing of arc control device be difficult to by about two arc control device housings that are put together each other fully ensure; owing to be subjected to the restriction of design space; can't guarantee the arc control device joining place envelope of going out all around; gas can produce escape; there are the numerical value of short circuit current and the uncertainty between the interior gas atmosphere size of arc control device; be difficult to the control circuit breaker and specifying rapid-releasing under the short circuit current; especially to electronic breaker; may can't protect in a certain short circuit current zone, bring breaker reliability low, poor stability thereupon.

Summary of the invention

Task of the present utility model is to provide a kind of good insulating; overall volume is little and help to dwindle and take up room; can directly act on the snap close of circuit breaker operation mechanism and use when being embodied in short circuit prior to back level thermo magnetic trip release device or electronic trip unit and thread off, shorten the drop-away time of circuit breaker, the reliability and stability of improving circuit breaker and use and guarantee personal safety and the electromagnetic short current protective device for breaker of the safety of circuit and power-supply device.

Task of the present utility model is finished like this, and a kind of electromagnetic short current protective device for breaker is characterized in that comprising that one is used to be installed to the draw-bar seat on the shell wall of arc-extinguishing chamber of circuit breaker housing, and this draw-bar seat constitutes a pull bar chamber; One flexible member places in the described pull bar chamber; One floating part is slidingly matched with described pull bar chamber and matches with the snap close pin of the snap close of circuit breaker operation mechanism; One iron core is installed on the described arc control device housing and corresponding to the below that is installed in the fixed contact on the arc control device housing; One armature is fixed in the described floating part and corresponding to the top of described iron core.

Arc control device housing described in the utility model comprises that both clap first, second valve that closes each other, be provided with the draw-bar seat that is used to scoop out described draw-bar seat on the outer wall of one end of the length direction of any one valve in first, second valve and scoop out mechanism, described draw-bar seat scoops out mechanism with draw-bar seat and matches.

Draw-bar seat described in the utility model scoops out mechanism and comprises a chamber, tenon post and location sill, the seat chamber is formed on described first valve, the tenon post extends on the seat chamber, the location sill are corresponding to the below in seat chamber, the nearly middle part of one side of the short transverse of described draw-bar seat offers a tenon post hole, the bottom of draw-bar seat offers a location sill cross-over connection groove, and described tenon post tenon is gone in the tenon post hole, and described location sill are corresponding in the location sill cross-over connection groove.

The bottom in the pull bar chamber of draw-bar seat described in the utility model has a flexible member supporting base, and that the top of the left right chamber wall in pull bar chamber respectively has a retaining is prominent, a pair of retaining is prominent to correspond to each other, the position placed in the middle of the short transverse of chamber, the front and back wall in pull bar chamber respectively offers a guide groove, a pair of guide groove corresponds to each other, and described floating part comprises the pull bar that is slidingly matched with the pull bar chamber, the top that is formed in pull bar and the feeler lever that matches with described snap close pin and extends laterally the top that is formed in pull bar and the armature seat of embedded armature.

Offer the armature groove on the armature seat described in the utility model, described armature is embedded in the armature groove.

Extended a flexible member positioning boss on the bottom end face of pull bar described in the utility model, on a pair of aspectant wall body of pull bar, respectively extended a retaining bead, retaining bead and described retaining be prominent to match and is dashed forward by retaining and stop, respectively extended sliver at another of pull bar on to aspectant wall body, a pair of sliver and described a pair of guide groove are slippery.

The strong point of the technical scheme that the utility model provides: the assembly of draw-bar seat, floating part, iron core, armature and flexible member is reasonable, so overall volume is little and help dwindling and take up room; Floating part matches with the snap close pin of the snap close of circuit breaker operation mechanism, thereby the indirect actuating snap close pin in the change prior art is into directly activating the snap close pin, ensured when short circuit prior to the dropout of level thermo magnetic trip release device or electronic trip unit afterwards, dropout (tripping operation) time of circuit breaker is shortened, both improved the reliability and stability of circuit breaker, guaranteed the safety of personal safety and power-supply device again, simultaneously can guarantee the built-in electrical insulation level, especially when opening breaker upper cover and repair or replace contents, good operation safety.

Description of drawings

Fig. 1 is a specific embodiment structure chart of the present utility model.

Fig. 2 is Fig. 1 assembling structure chart after finishing.

Embodiment

For the auditor and the public who makes Patent Office can be expressly understood technical spirit of the present utility model and beneficial effect more, the applicant general elaborates in conjunction with the accompanying drawings in the mode of embodiment below, but to the description of embodiment all is not restriction to the utility model scheme, any according to the utility model design done only for pro forma but not substantial equivalent transformation all should be considered as the technical solution of the utility model category.

Ask for an interview Fig. 1 and Fig. 2, as the industry's knowledge of the reason, circuit breaker has arc-extinguishing mechanism, arc-extinguishing mechanism has the arc control device housing 7 that constitutes arc control device, arc control device housing 7 is faced each other to clap by first valve 71 and second valve 72 and closes (merging) formation, first, second valve 71, be provided with in the 72 shell chambeies that constituted do not give among the figure illustrate but belong to the arc extinguishing grid pieces of known technology fully and touch bridge as the activity of moving contact, activity is touched bridge and is matched with fixed contact 8 among the figure, owing to be the circuit breaker of double break point, therefore fixed contact 8 has a pair of, though only show one among the figure, can't bring puzzlement to those of skill in the art's understanding.In the present embodiment, be processed with a draw-bar seat on the outer wall to an end of the length direction of first valve 71 and scoop out mechanism 73, preferred but not draw-bar seat that be limited to scoops out mechanism 73 and comprises seat chamber 731, tenon post 732 and the location sill 733 that take shape in integratedly on first valve 71.

Draw-bar seat 5 has a pull bar chamber 51, being processed with one in the bottom in pull bar chamber 51 both can be that projection also can be the flexible member supporting base 511 of pit, with location status shown in Figure 1 is example, respectively extended a retaining prominent 512 on the top of the left and right chamber in pull bar chamber 51 wall, a pair of retaining prominent 512 corresponds to each other, position placed in the middle (position placed in the middle of short transverse) at the chamber, front and back in pull bar chamber 51 wall respectively offers a guide groove 513, and a pair of guide groove 513 corresponds to each other.In addition, offer a tenon post hole 52 at the nearly middle part of a side of the short transverse of draw-bar seat 51 and offer a location sill cross-over connection groove 53 in the bottom of draw-bar seat 5.When draw-bar seat 5 is installed to after aforesaid draw-bar seat scoops out in the mechanism 73, location sill 733 are placed in the location sill cross-over connection groove 53 just, and tenon post 732 lucky tenons are gone in the tenon post hole 52, by above-mentioned explanation, can know fully, the function that draw-bar seat scoops out mechanism 73 is used for admitting draw-bar seat 5, that is to say, draw-bar seat 5 is deposited at or claims to be installed on draw-bar seat to scoop out in the mechanism 73.

The lower end of flexible member 6 is bearing on the flexible member supporting base 511, and the upper end is supported on the floating part 2.Floating part 2 comprises pull bar 21, feeler lever 22 and the armature seat 23 that three in one is made, and constitutes a flexible member positioning boss 213 on the bottom end face of pull bar 21, and the upper end of aforementioned flexible member 6 is bearing on this flexible member boss 213.With location status illustrated in figures 1 and 2 is example, on the wall body of the left and right sides of pull bar 21, respectively be equipped with a pair of retaining bead 212, and on the wall body of front and back, respectively constitute a sliver 211, after pull bar 21 was inserted in the pull bar chamber 51, the retaining bead 212 on top matched with aforesaid retaining prominent 512, promptly implemented spacing by the prominent 512 pairs of retaining beads 212 of retaining, the pull bar chamber 51 in order to avoid pull bar 21 is scurried out, again, retaining bead 212 irregularly has the contact area that reduces with the inwall in pull bar chamber 51, and frictional force is reduced.Aforesaid a pair of sliver 211 is corresponding to a pair of guide groove 513.Feeler lever 22 is dactylozoite, is positioned at the top of pull bar 21, and is corresponding with the top of the snap close pin 11 of the snap close 1 of the circuit breaker operation mechanism of illustrating among the figure.Armature seat 23 is positioned at a side on the top of pull bar 21, and shape is inverted U-shaped and promptly trends towards n shape.Preferred scheme is to process the armature groove 231 suitable with the thickness of armature 3 on armature seat 23, and shape and armature seat 23 identical armature 3 are embedded in the armature groove 231.Carry the armature seat 23 that is embedded with armature 3 top (Fig. 2 shows) corresponding to iron core 4.

The draw-bar seat 5 of present embodiment and the floating part 2 preferential insulating material that adopt are made.

Ask for an interview Fig. 2, the global shape of iron core 2 takes the shape of the letter U, its position on the arc extinguishing housing 7 corresponding to aforesaid fixed contact 8 below, and fixed contact 8 is with the pyromagnetic device that takes off of back level of circuit breaker or electronic trip unit electrical coupling.

Please continue to see Fig. 1 and Fig. 2, when short-circuit current passes through fixed contact 8, produce electromagnetic attraction between iron core 4 and the armature 3, when electromagnetic attraction reaches when being enough to overcome the active force of flexible member 6, when promptly being enough to make flexible member 6 compressions, armature 3 moves to iron core 4 directions, pull bar 21 slippage in pull bar chamber 51, promptly move down, until feeler lever 22 is touched mutually with the snap close pin 11 of snap close 1, and by feeler lever 22 pulling snap close pin 11, make the rapid release of circuit breaker operation mechanism (dropout), realize the tripping operation of circuit breaker.Behind the circuit breaker trip, fault current is cut off, and the electromagnetic force between iron core 4 and the armature 3 disappears, and the pull bar 21 of floating part 2 moves up under the restoring force effect of flexible member 6, take armature 3 by armature seat 23 and leave iron core 4, the feeler lever 22 of floating part 2 leaves snap close pin 11 simultaneously.The limit degree that floating part 2 moves upward is exceeded with contacting of bead 212 of retaining by retaining prominent 512, thereby has realized resetting of armature 3.

Because the utility model adopts said structure, overall volume is little and help dwindling and take up room; Floating part 2 matches with the snap close pin 11 of the snap close 1 of circuit breaker operation mechanism, thereby the indirect actuating snap close pin 11 in the change prior art is into directly activating snap close pin 11, ensured when short circuit prior to the dropout of level thermo magnetic trip release device or electronic trip unit afterwards, dropout (tripping operation) time of circuit breaker is shortened, both improved the reliability and stability of circuit breaker, guaranteed the safety of personal safety and power-supply device again, draw-bar seat 5 and the floating part 2 preferential insulating material that adopt are made, guaranteed the built-in electrical insulation level, especially when opening breaker upper cover and repair or replace contents, good operation safety.

Claims

1, a kind of electromagnetic short current protective device for breaker is characterized in that comprising that one is used to be installed to the draw-bar seat (5) on the shell wall of arc-extinguishing chamber of circuit breaker housing (7), and this draw-bar seat (5) constitutes a pull bar chamber (51); One flexible member (6) places in the described pull bar chamber (51); One floating part (2) is slidingly matched with described pull bar chamber (51) and matches with the snap close pin (11) of the snap close (1) of circuit breaker operation mechanism; One iron core (4) is installed on the described arc control device housing (7) and corresponding to the below that is installed in the fixed contact (8) on the arc control device housing (7); One armature (3) is fixed in the described floating part (2) and corresponding to the top of described iron core (4).

2, electromagnetic short current protective device for breaker according to claim 1; it is characterized in that described arc control device housing (7) comprises that both clap first, second valve (71,72) that closes each other; be provided with the draw-bar seat that is used to scoop out described draw-bar seat (5) on the outer wall of one end of the length direction of any one valve in first, second valve (71,72) and scoop out mechanism (73), described draw-bar seat (5) scoops out mechanism (73) with draw-bar seat and matches.

3; electromagnetic short current protective device for breaker according to claim 2; it is characterized in that described draw-bar seat scoops out mechanism (73) and comprises a chamber (731); tenon post (732) and location sill (733); seat chamber (73) is formed on described first valve (71); tenon post (732) extends on seat chamber (731); location sill (733) are corresponding to the below of seat chamber (73); the nearly middle part of one side of the short transverse of described draw-bar seat (5) offers a tenon post hole (52); the bottom of draw-bar seat (5) offers location sill cross-over connection grooves (53); described tenon post (732) tenon is gone in the tenon post hole (52), and described location sill (733) are corresponding in the location sill cross-over connection grooves (53).

4; electromagnetic short current protective device for breaker according to claim 1; the bottom that it is characterized in that the pull bar chamber (51) of described draw-bar seat (5) has a flexible member supporting base (511); and the top of the left right chamber wall of pull bar chamber (51) respectively has a retaining prominent (512); a pair of retaining prominent (512) corresponds to each other; the position placed in the middle of the short transverse of chamber, the front and back wall in pull bar chamber (51) respectively offers a guide groove (513); a pair of guide groove (513) corresponds to each other, and described floating part (2) comprises the pull bar (21) that is slidingly matched with pull bar chamber (51); be formed in the top of pull bar (21) and the feeler lever (22) that matches with described snap close pin (11) and extend laterally the top that is formed in pull bar (21) and the armature seat (23) of embedded armature (3).

5, electromagnetic short current protective device for breaker according to claim 4 is characterized in that offering armature groove (231) on the described armature seat (23), and described armature (3) is embedded in the armature groove (231).

6, electromagnetic short current protective device for breaker according to claim 4; it is characterized in that having extended a flexible member positioning boss (213) on the bottom end face of described pull bar (21); on a pair of aspectant wall body of pull bar (21), respectively extended a retaining bead (212); retaining bead (212) matches with described retaining prominent (512) and is stopped by retaining prominent (512); respectively extended sliver (211) at another of pull bar (21) on to aspectant wall body, a pair of sliver (211) is slippery with described a pair of guide groove (513).