CN201845722U

CN201845722U - Low-voltage circuit breaker with composite tripping function

Info

Publication number: CN201845722U
Application number: CN2010206102059U
Authority: CN
Inventors: 黄剑; 陈志刚; 陈建红; 王炯华; 管瑞良
Original assignee: Changshu Switchgear Manufacturing Co Ltd
Current assignee: Changshu Switchgear Manufacturing Co Ltd
Priority date: 2010-11-17
Filing date: 2010-11-17
Publication date: 2011-05-25
Anticipated expiration: 2020-11-17

Abstract

The utility model discloses a low-voltage circuit breaker with the composite tripping function and belongs to the technical field of the low voltage appliance. The circuit breaker comprises a magnetic tripping device, a pneumatic tripping device, a group of three or four monopole shell bodies, an operating mechanism provided with a beating rod and an actuating rod, wherein the monopole shell bodies are arranged in parallel and respectively consist of a first valve and a second valve; the magnetic tripping device comprises a current-carrying conductor, a yoke, a gag bit, an acting bracket and a return spring; the yoke is fixed with the current-carrying conductor; moreover, the yoke is matched with the gag big to form a closed electromagnetic loop; one end of the return spring pushes against the gag bit, and the other end of the return spring pushes against the current-carrying conductor; the gag bit is fixed on the acting bracket; the acting bracket is pivoted between the first valve and the second valve; the pneumatic tripping device comprises a sealing cavity and an acting air cavity; the sealing cavity is communicated with the acting air cavity; while the acting cavity is provided with an air hole; and the air hole corresponds to the acting rod. The low-voltage circuit breaker has the advantages of obtaining quick and reliable breaking effect through the effect on the acting rod either under a low-current breaking condition or under a high-current breaking condition; therefore, the timely response of the operating mechanism is guaranteed so as to break a failure current.

Description

Low-voltage circuit breaker with compound tripping function

Technical field

The utility model belongs to the low voltage electrical apparatus technology field, is specifically related to a kind of low-voltage circuit breaker with compound tripping function.

Background technology

As is known in the industry, low-voltage circuit breaker has one pole, multipole, multipole low-voltage circuit breaker is also arranged if any three utmost points and four utmost points, and under certain housing grade, the structure of each utmost point is essentially identical.Hence one can see that, as long as the structure of one pole is satisfied standardization and modular requirement, so just, can be combined into all three utmost points or four-pole circuit breaker as the aforementioned through standardization and modular single-pole circuit breaker by this class, this design concept not only can reduce manufacturing cost significantly, and assembly cost and efficiency of assembling can significantly improve too.

Undoubtedly, can be fast and reliably the disjunction fault current be an extremely important technical indicator weighing low-voltage circuit breaker, for this reason, be equipped with moving trip gear of overcurrent wink to low-voltage circuit breaker usually.The dropout mode of moving trip gear overcurrent wink has the branch of electromagnetic type dropout and pneumatic type dropout, under reduced-current disjunction situation, it is fast and thread off that the action critical point is stable, the strong point of dropout reliable in action that electromagnetic type has the action of threading off, and pneumatic type then shows as the action critical point instability of threading off and even do not move and make action unreliable; Under high electric current disjunction situation, because the structure of electromagnetic type is prone to the magnetic saturation phenomenon, therefore can't show the responsiveness of threading off more efficiently, the situation when that is to say with respect to the disjunction reduced-current there is no obvious difference, yet pneumatic type is threaded off can show the agility of action.

As shown in the above description, no matter be electromagnetic type trip gear or pneumatic type trip gear, all can not guarantee to the situation of higher breaking current, to accomplish fast and reliably action at low breaking current, therefore the good and bad complementation with electromagnetic type trip gear and pneumatic type trip gear is undoubtedly a kind of ultimate attainment selection, but, in disclosed patent and non-patent literature, there is no the technology enlightenment of being used for reference, and also be not seen in market and obtain commercial product.For this reason, the applicant has carried out useful exploration and trial, and technical scheme described below produces under this background.

Summary of the invention

No matter it is to use all obtaining the action of disjunction fast and reliably under the low current disjunction situation or under high electric current disjunction situation to guarantee operating mechanism response in time and the low-voltage circuit breaker with compound tripping function of breaking current that task of the present utility model is to provide a kind of.

Task of the present utility model is finished like this, a kind of low-voltage circuit breaker with compound tripping function, comprise the magnetic trip gear, pneumatic trip gear, one group of quantity is that three or four and each free first valve cooperate the one pole housing of arranging side by side that constitutes and have operating mechanism that hits bar and the actuating rod that is used to promote to hit bar with second valve, described magnetic trip gear comprises current, yoke, armature, effect support and back-moving spring, yoke and current are fixed, and yoke matches with armature and forms the electromagnetic circuit of sealing, back-moving spring one end is connected on the armature, the other end is connected on the current, armature is fixed on the effect support, and the hub setting rotationally of effect support is in described first, between second valve and corresponding with described actuating rod; Described pneumatic trip gear comprises the enclosed cavity that formed by first cavity on first valve that is formed on the one pole housing and the second cavity combination with one another that is formed on second valve on the same one pole housing and the effect air cavity that is formed by first acting chamber on first valve that is formed on the one pole housing and the second acting chamber combination with one another on second valve that is formed on the adjacent one pole housing, enclosed cavity communicates with the effect air cavity, and the effect air cavity has a venthole, and venthole is corresponding with described actuating rod.

Effect support described in the utility model passes through axle hub setting rotationally between described first, second valve.

Back-moving spring described in the utility model is a torsion spring and is set on the axle that first spring pin of this back-moving spring is connected on the armature, and second spring pin is connected on the current.

Actuating rod described in the utility model constitutes first, second bending part, support portion and plates from top to bottom successively, first bending part is corresponding with described strike bar and match, second bending part is corresponding with described effect support, support portion hub setting rotationally is on described one pole housing, and plates are corresponding to described venthole.

Effect support described in the utility model constitutes a combat arm towards the end extension of described actuating rod, and this combat arm is corresponding with described second bending part.

Constitute a spring installation portion in the shell chamber of first valve described in the utility model, be provided with a spring on the spring installation portion, this spring has an effect end, and the effect end contacts with described actuating rod.

The technical scheme that the utility model provides is owing to adopted the fit structure of magnetic trip gear and pneumatic trip gear, no matter thereby be all can obtain quick and reliable disjunction effect under the low current disjunction situation or under high electric current disjunction situation by effect to actuating rod, ensured operating mechanism response in time and the disjunction fault current.

Description of drawings

Fig. 1 is the schematic diagram that the utlity model has the low-voltage circuit breaker of compound tripping function.

Fig. 2 is the schematic diagram of magnetic trip gear of the present utility model.

Fig. 3 is the internal structure schematic diagram of first valve 31 of one pole housing 3 of the present utility model.

Fig. 4 is the external structure schematic diagram of first valve 31 of one pole housing 3 of the present utility model.

Fig. 5 is the internal structure schematic diagram of second valve 32 of one pole housing 3 of the present utility model.

Fig. 6 is the external structure schematic diagram of second valve 32 of one pole housing 3 of the present utility model.

Fig. 7 is the schematic diagram of first,

second valve

31,32 combinations with one another.

Embodiment

Asking for an interview Fig. 1 to Fig. 7, in the explanation, is example with the residing state of accompanying drawing all about the statement of direction and position below.The low-voltage circuit breaker with compound tripping function that the utility model provides comprises magnetic trip gear 1, pneumatic trip gear, one group of quantity is that three or four and each free first valve 31 cooperate the one pole housing 3 that forms with second valve 32, have the operating mechanism 5 that hits bar 51 and be used for promoting the actuating rod 6 that (actuating) hits bar 5, in addition, according to general knowledge, low-voltage circuit breaker undoubtedly also includes a pedestal of being furnished with lid, can fully be understood by the disclosed single-pole modular low-voltage breaker of utility model patent Granted publication CN201167068Y (application that the applicant proposes) that is not limited to this.

Aforesaid magnetic trip gear 1 comprises current 11, yoke 12, armature 13, effect support 14, axle 15 and back-moving spring 16, yoke 12 can be fixing with current 11 by screw 121, the global shape of this yoke 12 takes the shape of the letter U, obvolvent is on current 11, yoke 12 cooperatively interacts with armature 13 and forms the circuit loop of a sealing, armature 13 is fixed on the effect support 14 by rivet 131, and effect support 14 by axle 15 hub settings rotationally in the hole 141 of the effect of being placed on the support 14 in first, second valve 31, between 32, more particularly, one end of axle 15 is placed in first axis hole 311 that is opened on first valve 31, and the other end then is placed in second axis hole 321 that is opened on second valve 32.Back-moving spring 16 is nested with at the middle part of axle 15, and first spring pin 161 of this back-moving spring 16 is connected on the armature 13, and second spring pin 162 then is connected on the current 11.Aforesaid effect support 14 is corresponding with aforesaid actuating rod 6, specifically: effect support 14 be extended with a combat arm 142 with actuating rod 6 corresponding positions, hit actuating rods 6 by combat arm 142.By said structure as can be known, when yoke 12 attracts armature 13, certainly will rotate together by armature 13 induced effect supports 14.Aforesaid current 11 is positioned on the major loop, and when excessive electric current flows through current 11, yoke 12 will produce electromagnetic attracting force armature 13 and rotate to yoke 12, to form aforesaid sealing electromagnetic circuit.

Aforesaid actuating rod 6 is flexuose structure, more particularly, this actuating rod constitutes first,

second bending part

64,63, feet 61 and plates 62 from top to bottom successively, wherein: first bending part 64 is corresponding with the strike bar 51 of aforesaid operating mechanism 5, when the combat arm 142 of the effect support 14 of magnetic trip gear 1 acts on second bending part 63 of actuating rod 6, make first bending part 64 of actuating rod 6 hit bar 51, circuit breaker operation mechanism just produces response (dropout).In like manner, when the following pneumatic trip gear impetus bar 6 that also will mention, promptly during the plates 62 of gas impetus bar 6, just make first bending part 64 hit bars 51, circuit breaker operation mechanism produces response (dropout) equally.

By shown in Figure 1, cooperatively interact and form a single-pole circuit breaker by first,

second valve

31,32, therefore three utmost points or four-pole circuit breaker then duplicate by this, and the space between two adjacent single-pole circuit breakers is combined by first,

second valve

31,32 that adheres to adjacent single-pole circuit breaker separately.Show that by Fig. 3 first valve 31 is provided with first cavity 312; Show that by Fig. 5 second valve 32 is provided with second cavity 322.So after first,

second valve

31,32 faced each other cooperation, then first, second 312,322 common cooperations of cavity were formed enclosed cavities 41 (Fig. 3 shows), the contact system of circuit breaker is positioned at enclosed cavity 41.Show by Fig. 4, constitute first acting chamber 313 on first valve 31; Show by Fig. 6, constitute one second acting chamber 323 on second valve 32, so after first,

second valve

31,32 faced each other cooperation, then first, second acting chamber 313,323 fitted in effect air cavity 42 jointly.Aforesaid enclosed cavity 41 constitutes pneumatic trip gear described in the utility model with effect air cavity 42, and enclosed cavity 41 is communicated by the aperture of offering 3121 with effect air cavity 42.Aforesaid effect air cavity 42 has a venthole 421, and venthole 421 is also combined by first valve 31 between adjacent one pole and second valve 32, and venthole 421 is corresponding to the plates 62 of aforesaid actuating rod 6.When pneumatic trip gear of the present utility model did not move, plates 62 can closely cooperate with venthole 421, guarantee the air-tightness before pneumatic trip gear does not move, and can produce bigger thrust when pneumatic trip gear moves.When the breaker contact system breaking current, because the existence of electric arc, to produce bigger air pressure moment in the enclosed cavity 41, make air communication small holes 3121 flow to effect air cavity 42, and discharge, promote plates 62 simultaneously by venthole 421, cause that actuating rod 6 rotates counterclockwise, the strike bar 51 of first bending part, the 64 bulldozing operation mechanisms 5 of actuating rod 6, thus by operating mechanism separating brake circuit breaker, realize the dropout of circuit breaker.

Owing to hold described actuating rod 6 and satisfy actuating rod 6 and rotate conical cavity 316, arc sections 314 and the peristome 315 that requires in first housing 31 outside existence, and conical cavity 316, arc sections 314 and peristome 315 threes form two upper and lower openings and that the end is overlapping is tubaeform.Because the shape of the support portion 61 on arc sections 314 and the actuating rod 6 is suitable, and gap between the two only guarantees that support portion 61 can rotate in arc sections 314, again because peristome 315 and conical cavity 316 define the hunting range of actuating rod 6, therefore, comprehensive above-mentioned 2 and can in initial position and these two hunting ranges that operating state limited of dropout position, swing by guarantee effect bar 6.When actuating rod 6 swung to the dropout position, first bending part 64 was spreaded to and is hit bar 51, thereby makes operating mechanism 5 dropout circuit breakers.The awl chamber 326, circular arc neck 324 and the opening 325 that are shown on second valve 32 among Fig. 6 are equivalent to aforesaid conical cavity 316, arc sections 314 and peristome 315 respectively, so the applicant repeats no more.

In Fig. 4, the outside of one of them valve in first, second valve 31,32 (present embodiment is selected first valve 31) holds in the structure of actuating rod 6, because what select is first valve 31, therefore in first valve 31, constitute a spring shaft 317, spring shaft 317 is provided with a spring 7, one end formation effect end 71 of spring 7, effect end 71 are corresponding to spring open slot 318 and act on described actuating rod 6, and the other end of spring 7 is embedded in the spring pin groove 319.The spring installed part 327 that is shown on second valve 32 is equivalent to aforesaid spring shaft 317.Aforesaid spring open slot 318 is swung the effect end 71 of spring 7 in hunting range under flexible effect, this hunting range should satisfy first bending part 64 that makes aforesaid actuating rod 6 at least and leave strike bar 51.Certainly, because there is runback power in operating mechanism 5, this runback power makes strike bar 51 can leave the dropout position by impetus bar 6 under the pushing of no actuating rod 6, but can't reach the initial position state.Therefore the existence of spring 7 can make the answer speed of actuating rod 6 increase, and simultaneously because the hunting range of the effect end 71 of spring 7 is bigger, thereby guarantee effect bar 6 is reached initial condition after answer reliably.

In sum, the utility model scheme has remedied the shortcoming in the prior art, has reached goal of the invention, and has embodied due technique effect.Any and such scheme near and what solve identical technical problem is the protection range that other identical variation scheme of essence all should be considered as falling into the application.

Claims

1. low-voltage circuit breaker with compound tripping function, comprise magnetic trip gear (1), pneumatic trip gear, one group of quantity is three or four and each free first valve (31) cooperate the one pole housing (3) of arranging side by side and the operating mechanism (5) with strike bar (51) that constitutes and be used for promoting strike bar (51) with second valve (32) actuating rod (6), it is characterized in that: described magnetic trip gear (1) comprises current (11), yoke (12), armature (13), effect support (14) and back-moving spring (16), yoke (12) is fixing with current (11), and yoke (12) matches with armature (13) and forms the electromagnetic circuit of sealing, back-moving spring (16) one ends are connected on the armature (13), the other end is connected on the current (11), armature (13) is fixed on the effect support (14), and the hub setting rotationally of effect support (14) is in described first, second valve (31,32) between and corresponding with described actuating rod (6); Described pneumatic trip gear comprises the enclosed cavity (41) that formed by first cavity (312) on first valve (31) that is formed on the one pole housing (3) and second cavity (322) combination with one another that is formed on second valve (32) on the same one pole housing (3) and the effect air cavity (42) that is formed by first acting chamber (313) on first valve (31) that is formed on the one pole housing (3) and second acting chamber (323) combination with one another on second valve (32) that is formed on the adjacent one pole housing (3), enclosed cavity (41) communicates with effect air cavity (42), and effect air cavity (42) has a venthole (421), and venthole (421) is corresponding with described actuating rod (6).

2. the low-voltage circuit breaker with compound tripping function according to claim 1 is characterized in that described effect support (14) passes through axle (15) hub setting rotationally between described first, second valve (31,32).

3. the low-voltage circuit breaker with compound tripping function according to claim 1, it is characterized in that described back-moving spring (16) is a torsion spring and is set on the axle (15), first spring pin (161) of this back-moving spring (16) is connected on the described armature (13), and second spring pin (162) is connected on the described current (11).

4. the low-voltage circuit breaker with compound tripping function according to claim 1, it is characterized in that described actuating rod (6) constitutes first, second bending part (64,63), support portion (61) and plates (62) from top to bottom successively, first bending part (64) is corresponding with described strike bar (51) and match, second bending part (63) is corresponding with described effect support (14), support portion (61) hub setting rotationally is on described one pole housing (3), and plates (62) are corresponding to described venthole (421).

5. the low-voltage circuit breaker with compound tripping function according to claim 4, it is characterized in that described effect support (14) constitutes a combat arm (142) towards the end extension of described actuating rod (6), this combat arm (142) is corresponding with described second bending part (63).

6. the low-voltage circuit breaker with compound tripping function according to claim 1, it is characterized in that constituting a spring installation portion (317) in the shell chamber of described first valve (31), on spring installation portion (317), be provided with a spring (7), this spring (7) has an effect end (71), and effect end (71) contacts with described actuating rod (6).