CN207250371U - Low-voltage circuit breaker - Google Patents

Abstract

The utility model provides a kind of low-voltage circuit breaker, it includes：Static contact, it is fixedly arranged on pedestal, and static contact is arranged in U-shaped poly- magnetic portion, and the end of static contact is equipped with the first striking portion for tilting down extension, and the first striking portion is located at the top in U-shaped poly- magnetic portion；Moving contact, its can rotate positioned at the top of static contact, moving contact is in contact or is separated with static contact, and the free end of moving contact is equipped with the second striking portion of the extension that is inclined upwardly；Arc-chutes, it is fixedly arranged on pedestal, is equipped with top striking grid and bottom striking grid in arc-chutes, and striking grid in bottom is located at the top in U-shaped poly- magnetic portion and opposite with the first striking portion, and top striking grid can be opposite with the second striking portion.The utility model can increase electric arc in the case where not lengthening moving contact length and space out and pull open speed, lift the operating voltage and breaking capacity of low-voltage circuit breaker, small, low in energy consumption.

Description

Low-voltage circuit breaker

Technical field

Low voltage electrical apparatus technology field is the utility model is related to, specifically a kind of high voltage, the plastic shell low voltage of high breaking break Road device.

Background technology

In the prior art, breaker is divided into high-voltage circuitbreaker and low-voltage circuit breaker by its use scope, and general voltage is More than 3kV for high-voltage circuitbreaker, other are then low-voltage circuit breaker, in low-voltage circuit breaker, voltage for 800V and the above then For high-tension low-voltage circuit breaker.At present, to realize the high voltage of low-voltage circuit breaker, high breaking capacity, generally use, which increases, goes out The methods of arc chamber, lengthening lengths of contacts are to increase clearance between open contacts, series connection multiple breakpoints, although those methods can improve The breaking capacity of breaker, but the volume of breaker can significantly increase, and cause the market demand of breaker to reduce, while open circuit Device cost can increase, and reduce the market competitiveness.

In view of the above-mentioned problems of the prior art, the present inventor combines the design and use of related manufacturing field for many years Experience, there is provided a kind of low-voltage circuit breaker, to overcome drawbacks described above.

Utility model content

The purpose of this utility model is to provide a kind of low-voltage circuit breaker, it can increase in the case where not lengthening moving contact length Power-up arc spaces out and pulls open speed, lifts the operating voltage and breaking capacity of low-voltage circuit breaker, small, low in energy consumption.

The above-mentioned purpose of the utility model can be realized using following technical proposal：

The utility model provides a kind of low-voltage circuit breaker, it includes：Static contact, it is fixedly arranged on pedestal, the static contact U-shaped poly- magnetic portion is arranged in, the end of the static contact is equipped with the first striking portion for tilting down extension, the first striking position In the top in the U-shaped poly- magnetic portion；Moving contact, its can rotate positioned at the top of the static contact, the moving contact with it is described Static contact is in contact or is separated, and the free end of the moving contact is equipped with the second striking portion of the extension that is inclined upwardly；Arc-chutes, its It is fixedly arranged on the pedestal, top striking grid and bottom striking grid, the bottom striking grid is equipped with the arc-chutes Positioned at the top in the U-shaped poly- magnetic portion and opposite with the first striking portion, the top striking grid can draw with described second Arc portion is opposite.

In a preferred embodiment, the static contact includes conducting base, and one end of the conducting base is equipped with reversely Matrix, the conducting base are arranged in the U-shaped poly- magnetic portion, and the reversely matrix is located at the top of the conducting base, described First striking portion is fixedly arranged on the reverse matrix.

In a preferred embodiment, the moving contact includes conducting rod, and one end of the conducting rod can rotate fixed In control mechanism, the other end of the conducting rod is equipped with movable contact, and the reversely matrix is equipped with mounting surface, on the mounting surface Equipped with the stationary contact that can be in contact with the movable contact.

In a preferred embodiment, the bottom striking grid is located at the lower section of the stationary contact, the bottom striking Grid is opposite with the lower end in the first striking portion and has the first distance therebetween；The top striking grid is positioned at described The top of movable contact, the top striking grid include grid main body and the striking extension extended downwardly from the grid main body Body, opens up to maximum position in the moving contact, and the striking ennation is upper with the second striking portion End is opposite and has second distance therebetween.

In a preferred embodiment, first distance is 0.5mm-4mm, and the second distance is 1mm-3mm.

In a preferred embodiment, the mounting surface is parallel with the baseplane of the pedestal, or the mounting surface and institute The baseplane for stating pedestal is at an acute angle.

In a preferred embodiment, the conductive base can be absorbed by being equipped between the conducting base and the reversely matrix The electric current formed poly- magnetic patch for being unfavorable for the outside magnetic field of vertical paper that electric arc is moved to arc-chutes direction, the poly- magnetic in body Block is made of permeability magnetic material.

In a preferred embodiment, insulating boot is equipped between the conducting base and the bottom striking grid, it is described Insulating boot is located at the top in the U-shaped poly- magnetic portion.

In a preferred embodiment, the first striking portion is made of permeability magnetic material, and the bottom striking grid is by leading Magnetic material is made.

In a preferred embodiment, the indoor front side of the arc extinguishing and rear side are respectively equipped with one made of gas exhausted material The stationary contact of arc insulating cover, the movable contact of the moving contact and the static contact is respectively positioned between two arc insulating covers, it is described every Arc cover and the distance of the side of the static contact are less than the arc insulating cover and the distance of the side of the moving contact.

In a preferred embodiment, the moving contact of the low-voltage circuit breaker further includes two auxiliary moving contacts, two institutes State the both sides that auxiliary moving contact is parallel to the moving contact, the stationary contact of the movable contact and the static contact of the auxiliary moving contact The distance between be more than the distance between stationary contact of movable contact and the static contact of the moving contact.

The characteristics of low-voltage circuit breaker of the utility model and advantage are：

The utility model is by the first striking portion tilted down of static contact, by the electric arc at stationary contact along the first striking First arc ignition face in portion is quickly moved at the bottom striking grid of arc-chutes, while pass through moving contact acclivitous second Second arc ignition face in the electric arc at movable contact along the second striking portion, is quickly moved to the top striking grid of arc-chutes by striking portion Place, and by making the lower section that static contact passes through U-shaped poly- magnetic portion and U-shaped poly- magnetic portion is placed in bottom striking grid, make U-shaped poly- magnetic portion High-intensity magnetic field is formed between bottom striking grid, electric arc quickly moves under the action of the magnetic field to arc-chutes direction, with not The quick mobile of electric arc is realized in the case of lengthening moving contact length and is elongated, lifts operating voltage and the disjunction of low-voltage circuit breaker Ability, it is small, it is low in energy consumption.

Brief description of the drawings

It is required in being described below to embodiment in order to illustrate more clearly of the technical scheme in the embodiment of the utility model Attached drawing to be used is briefly described, it should be apparent that, drawings in the following description are only some realities of the utility model Example is applied, for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings Obtain other attached drawings.

Fig. 1 is the dimensional structure diagram of the utility model low-voltage circuit breaker；

Fig. 2 is schematic cross-sectional view of the utility model low-voltage circuit breaker under "on" position；

Fig. 3 is the static contact of an embodiment and the structure diagram of pedestal of the utility model low-voltage circuit breaker；

Fig. 4 A are the structure diagram in the U-shaped poly- magnetic portion of the utility model low-voltage circuit breaker；

Fig. 4 B are combining structure schematic diagram of the static contact with U-shaped poly- magnetic portion of the utility model low-voltage circuit breaker；

Fig. 5 A are the structure diagram of the insulating boot of the utility model low-voltage circuit breaker；

Fig. 5 B are that the static contact of the utility model low-voltage circuit breaker and the combining structure of U-shaped poly- magnetic portion and insulating boot are illustrated Figure；

Fig. 6 is the arc-chutes of the utility model low-voltage circuit breaker and the structure diagram of static contact；

Fig. 7 is the structure diagram of the moving contact of the utility model low-voltage circuit breaker；

Fig. 8 A are the electric current of the utility model low-voltage circuit breaker and the structure diagram of Distribution of Magnetic Field；

Fig. 8 B be along the B in Fig. 8 A to enlarged structure schematic diagram；

Fig. 9 is the structure diagram of the bottom striking grid of the utility model low-voltage circuit breaker；

Figure 10 is the utility model low-voltage circuit breaker structure diagram that electric arc moves towards under gate-dividing state；

Figure 11 is the structure diagram of another embodiment of the low-voltage circuit breaker of the utility model；

Figure 12 is the structure diagram of the another embodiment of the low-voltage circuit breaker of the utility model.

Drawing reference numeral explanation：

1st, pedestal；11st, baseplane；2nd, static contact；21st, conducting base；211st, reverse matrix；212nd, mounting surface；22nd, stationary contact Point；23rd, the first striking portion；231st, the first arc ignition face；232nd, lower end；24th, poly- magnetic patch；25th, U-shaped poly- magnetic portion；251st, end face；26、 Insulating boot；3rd, arc-chutes；31st, bottom striking grid；311st, striking point；32nd, arc insulating cover；33rd, top striking grid；331st, grid Main body；332nd, striking ennation；333rd, striking head；4th, moving contact；41st, conducting rod；42nd, movable contact；43rd, the second striking portion； 431st, the second arc ignition face；44th, moving contact is aided in；5th, electric arc；6th, elongating arc；α, acute angle；β 1, acute angle；β 2, acute angle；F, magnetic field； E, magnetic field；H, magnetic field；G, magnetic field；I, current direction；L1, the first distance；L2, second distance；L3, the 3rd distance；L4, gap； L5, open away from；L6, striking open away from.

Embodiment

The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are without making creative work All other embodiments obtained, shall fall within the protection scope of the present invention.

In addition to non-individual defines the direction pointed out, the direction such as upper and lower, forward and backward being referred to herein is with this reality Subject to the direction such as upper and lower, forward and backward in new shown Fig. 1, illustrate in this together.

In moulded case circuit breaker, usually contain (such as quiet at least one fixed contact point of each pole Contact) and at least one mobile contact part (such as moving contact), in closure/disconnection of breaker, fixed contact point with Mobile contact part is connected with each other or mutually disconnects, while is also set up in contact area by an arc-control device and a set of control machine Structure, arc-control device are used to extinguish electric arc caused by mobile contact part connection or disconnection, and control mechanism is used to control movably to connect The movement of contact portion point, to drive mobile contact part and fixed contact point connection or disconnection.

Fixed contact point, mobile contact part and the arc-control device in such breaker are the utility model is related to, specifically , as shown in Figures 1 to 12, the utility model provides a kind of low-voltage circuit breaker, it includes：Static contact 2, it is fixedly arranged on pedestal 1 On, the static contact 2 is arranged in U-shaped poly- magnetic portion 25, and the end of the static contact 2 is equipped with the first striking portion for tilting down extension 23, the first striking portion 23 is located at the top in the U-shaped poly- magnetic portion 25；Moving contact 4, what it can be rotated is located at the static contact 2 top, the moving contact 4 are in contact or are separated with the static contact 2, and the free end of the moving contact 4 is equipped with to updip The the second striking portion 43 tiltedly extended；Arc-chutes 3, it is fixedly arranged on the pedestal 1, and top striking grid are equipped with the arc-chutes 3 Piece 33 and bottom striking grid 31, the bottom striking grid 31 are located at the top in the U-shaped poly- magnetic portion 25 and with described first Striking portion 23 is opposite, and the top striking grid 33 can be opposite with the second striking portion 43.

More specifically, as shown in figs. 2 and 10, pedestal 1 is substantially in tabular, and static contact 2 is fixedly arranged on the upper table of pedestal 1 Face, the lower ends of arc-chutes 3 are fixedly arranged on pedestal 1, and a part for static contact 2 is located at the lower section of arc-chutes 3, and the end of static contact 2 Portion is located at the side of arc-chutes 3, and moving contact 4 is located at the top of the end of static contact 2 and opposite with arc-chutes 3, moving contact 4 from It can be in contact or be separated with the end of static contact 2 under the control of control mechanism by end, to realize the closure of low-voltage circuit breaker With disconnection, U-shaped poly- magnetic portion 25 takes the shape of the letter U (as illustrated in figures 4 a and 4b), it is enclosed to set by bottom wall and two side walls forms, the upper end of side wall End face 251 is formed, opening is formed between the upper end of two side walls, is open towards arc-chutes 3.Low-voltage circuit breaker is in closure and disconnects Caused electric arc 5, can draw in acclivitous the second of the first striking portion 23 tilted down of static contact 2 and moving contact 4 Under the guiding of arc portion 43, elongating arc 6 is formed between the bottom striking grid 31 and top striking grid 33 of arc-chutes 3, And U-shaped poly- magnetic portion 25 can produce and be conducive to the magnetic field that electric arc is moved towards 3 direction of arc-chutes, not lengthen moving contact length In the case of increase electric arc space out and pull open speed, lift the operating voltage and breaking capacity of low-voltage circuit breaker, small, work( Consume low.

Wherein, as shown in Fig. 2, Fig. 8 A, Fig. 8 B and Fig. 9, the bottom striking grid 31 is located at the U-shaped poly- magnetic portion 25 Top, makes U-shaped poly- magnetic portion 25 be enclosed with bottom striking grid 31 and sets to form the loop construction with gap L 4, namely U-shaped poly- magnetic portion 25 enclose the poly- magnetic closed loop for setting and being formed with gap L 4 with bottom striking grid 31, and strong leakage magnetic field E can be formed in the gap L 4, should Magnetic field E can attract electric arc to be moved towards 3 direction of arc-chutes, and under the action of the E of the magnetic field, bottom striking grid 31 is magnetized simultaneously Slotted zone release magnetic field F (as shown in Figure 9) at the striking point 311 of bottom striking grid 31, magnetic field F can produce electric arc 5 The raw Lorentz force towards 3 direction of arc-chutes, is conducive to electric arc and is moved to 3 direction of arc-chutes, it is preferred that the gap L 4 is 1mm-5mm。

Further, as shown in Figures 2 and 3, the static contact 2 includes conducting base 21, and the one of the conducting base 21 End is equipped with reverse matrix 211, the conducting base 21 be arranged in the U-shaped poly- magnetic portion 25 (namely conducting base 21 be embedded in it is U-shaped Poly- magnetic portion 25, enables also to produce magnetic field under the action of electric current formed magnetic field of the U-shaped poly- magnetic portion 25 in conducting base 21), institute The top that reverse matrix 211 is located at the conducting base 21 is stated, the first striking portion 23 is fixedly arranged on the reversely matrix 211, Specifically, reversely matrix 211 is upward from one end of conducting base 21 and oppositely extending formation, conducting base 21 is located at arc-chutes 3 lower section, reverse matrix 211 are located at the side of arc-chutes 3, and electric current I flows to reverse matrix 211, reverse base through conducting base 21 Body 211 forms reverse current repulsion structure with moving contact 4, meanwhile, the outer surface in the first striking portion 23 forms the first arc ignition face 231, the upper end in the first striking portion 23 is connected to the end of reverse matrix 211, lower end 232 and the bottom striking in the first striking portion 23 The striking point 311 of grid 31 is horizontal opposite and is located at static contact 2 with U-shaped poly- magnetic portion monoclinic phase pair about 25, namely U-shaped poly- magnetic portion 25 The first striking portion 23 lower end 232 lower left, the first striking portion 23 is tilted down extension, the first arc ignition face 231 and base The baseplane 11 of seat 1 α at an acute angle, end face 251 and bottom in U-shaped poly- magnetic portion 25 in the first quartile of the xy1 coordinate systems shown in Fig. 3 Hold distance and the end face 251 of striking grid 31 equal with the distance of the lower end 232 in the first striking portion 23 of static contact 2, the distance The gap of the poly- magnetic closed loop as formed, preferably, the gap is 3mm.

Further, as shown in Fig. 2, the moving contact 4 includes conducting rod 41, what one end of the conducting rod 41 can rotate Control mechanism is fixedly arranged on, the other end of the conducting rod 41 is equipped with movable contact 42, and the reversely matrix 211 is equipped with mounting surface 212, the mounting surface 212 is equipped with the stationary contact 22 that can be in contact with the movable contact 42, specifically, control mechanism is existing Known structure in technology, details are not described herein, and one end of conducting rod 41 is articulated on control mechanism by shaft, conducting rod 41 The other end lower surface welding movable contact 42, and the stationary contact 22 on movable contact 42 and reverse matrix 211 is opposite, movable contact 42 Positioned at the lower section of top striking grid 33, stationary contact 22 is located at the top of bottom striking grid 31, and conducting rod 41 sets movable contact 42 one end, which is inclined upwardly, extends to form the second striking portion 43, namely is tilted towards the top striking grid 33 of arc-chutes 3 Extension, the second striking portion 43 have the second arc ignition face 431 of energy pilot arc, upper end and the reverse matrix in the first striking portion 23 Abutted between 211 junction and stationary contact 22 or there is narrow gap, which can be 0.5mm；Pass through control mechanism control The rotation of conducting rod 41 processed, and then control the contact with static contact 2 of moving contact 4 and separate, realization is switched on or switched off breaker, and By the second striking portion 43 being arranged between movable contact 42 and arc-chutes 3 and it is arranged between stationary contact 22 and arc-chutes 3 First striking portion 23, pilot arc and elongating arc, in favor of arc extinction.

Further, as shown in Figure 2 and Figure 9, the bottom striking grid 31 is located at the lower section of the stationary contact 22, described Bottom striking grid 31 is opposite with the lower end 232 in the first striking portion 23 and has the first distance L1 therebetween, specifically, As shown in figure 9, bottom striking grid 31 is equipped with groove towards the side of moving contact 4, the centrosymmetric of groove is equipped with two and draws Acnode 311, the first distance L1 are also between the striking point 311 of bottom striking grid 31 and the lower end 232 in the first striking portion 23 Distance, the extinguishing being provided with beneficial to electric arc of the first distance L1；The top striking grid 33 is located at the movable contact 42 Top, the top striking grid 33 include grid main body 331 and the striking ennation extended downwardly from the grid main body 331 332, opened up in the moving contact 4 to maximum position (as shown in Figure 10), the striking ennation 332 and institute State the upper end in the second striking portion 43 relatively and there is therebetween second distance L2, second distance L2 namely striking ennation 332 The striking first 333 of front end and the distance between second arc ignition face 431 in the second striking portion 43, the setting of second distance L2 is favourable In the extinguishing of electric arc, as a result, the electric arc 5 produced between movable contact 42 and stationary contact 22 can be the second of the second striking portion 43 The internal face of striking ennation 332 and first arc ignition face 231 in the first striking portion 23 of arc ignition face 431 and top striking grid 33 Guiding under, be elongated and as elongating arc 6 and enter arc-chutes 3 top striking grid 33 and bottom striking grid 31 it Between, it is preferred that the first distance L1 is 0.5mm-4mm, and the second distance L2 is 1mm-3mm, preferably, the first distance L1 For 3mm, second distance L2 is 3mm.

The angle for being used to install the mounting surface 212 of the stationary contact 22 of static contact 2 of the utility model is touched with the dynamic of moving contact 4 The installation direction of point 42 matches, and the angle of specific mounting surface 212 can set as follows：In one embodiment, as shown in figure 11, The mounting surface 212 is parallel with the baseplane 11 of the pedestal 1, in another embodiment, as shown in Fig. 2, Fig. 3 and Figure 12, institute State mounting surface 212 and the baseplane 11 of the pedestal 1 is at an acute angle, wherein, mounting surface 212 is at an acute angle with the institute of baseplane 11 to be The acute angle in acute angles beta 2 (as shown in figure 12) or the second quadrant of xy2 coordinate systems in the first quartile of xy1 coordinate systems β 1 (as shown in Figures 2 and 3), the installation direction of the movable contact 42 of moving contact 4 is consistent with the direction of mounting surface 212, herein It is not limited.

Further, as shown in Fig. 2, the conducting base 21 and it is described be reversely equipped between matrix 211 can absorb described in The electric current formed poly- magnetic patch for being unfavorable for the outside magnetic field of vertical paper that electric arc is moved to arc-chutes direction in conducting base 21 24, the poly- magnetic patch 24 is made of permeability magnetic material, preferably, poly- magnetic patch 24 is bolted in the upper table of the conducting base 21 of static contact 2 Face, and positioned at the lower section of the lower section, the more particularly stationary contact 22 on reverse matrix 211 of reverse matrix 211, by magnetic conduction Poly- magnetic patch 24 made of material absorbs the outside magnetic field of the vertical paper produced above conducting base 21, and discharges and hang down after being magnetized The straight magnetic field of paper inwards, i.e., poly- magnetic patch 24 is for weakening in conducting base 21 the electric current formed electric arc that is unfavorable for arc-chutes 3 The outside magnetic field of vertical paper of direction movement, and strengthen in reverse matrix 211 the electric current formed electric arc that is beneficial to 3 side of arc-chutes To the magnetic field of mobile vertical paper inwards, moved beneficial to electric arc to 3 direction of arc-chutes, accelerate electric arc enter arc-chutes 3 and by Elongate, extinguish.

Further, as shown in Fig. 2, Fig. 5 A and Fig. 5 B, between the conducting base 21 and the bottom striking grid 31 Equipped with insulating boot 26, the insulating boot 26 is located at the top in the U-shaped poly- magnetic portion 25, specifically, the shape of insulating boot 26 substantially Combined shaped substantially with the upper surface of conducting base 21 and the lower surface of reverse matrix 211 matches, and insulating boot 26 is arranged at Between the conducting base 21 of static contact 2 and the bottom striking grid 31 of arc-chutes 3, for U-shaped poly- magnetic portion 25 and arc-chutes 3 Grid insulate, prevent U-shaped poly- magnetic portion 25 from puncturing with arc-chutes.

Further, the first striking portion 23 is made of permeability magnetic material, and the bottom striking grid 31 is by permeability magnetic material It is made so that the first striking portion 23 and bottom striking grid 31 can absorb the electric current in conducting base 21 above conducting base 21 What is produced is unfavorable for the outside magnetic field G of vertical paper that electric arc is moved to 3 direction of arc-chutes, and it is converted into and is conducive to electric arc The magnetic field of the vertical paper moved to 3 direction of arc-chutes inwards, so that electric arc is quickly mobile to arc-chutes direction and elongates.

Further, as depicted in figs. 1 and 2, the front side in the arc-chutes 3 and rear side are respectively equipped with one by gas exhausted material Manufactured arc insulating cover 32, the movable contact 42 of the moving contact 4 and the stationary contact 22 of the static contact 2 are respectively positioned on two arcs Between cover 32, the arc insulating cover 32 and the distance of the side of the static contact 2 are less than the arc insulating cover 32 and the moving contact 4 The distance of side, realize makes 32 aerogenesis of arc insulating cover within the first time for producing electric arc, and is provided enough to the movement of moving contact 4 Space, specifically, gas exhausted material can be nylon etc., arc insulating cover 32 is discharged indifferent gas under the high temperature action of electric arc Body, the arc insulating cover 32 of front side and the arc insulating cover 32 of rear side are symmetrical arranged, and the setting scope of arc insulating cover 32 includes static contact 2 and move to touch First 4 scope of activities, namely be closed to moving contact 4 including static contact 2 and moving contact 4 and open to the Zone Full of maximum position, Certainly, the arc insulating cover 32 and the distance of the side of the static contact 2 can also be equal to the arc insulating cover 32 and the moving contact 4 Side distance, it is preferred that the distance of the side of the arc insulating cover 32 and the moving contact 4 is 0.1mm-3mm, the arc Cover 32 and the distance of the side of the static contact 2 are 0.1mm-3mm, preferably, arc insulating cover 32 and the distance of the side of moving contact 4 For 1.5mm, arc insulating cover 32 and the distance of the side of static contact 2 are 0.1mm.

Further, as shown in fig. 7, the moving contact 4 of the low-voltage circuit breaker further include two auxiliary moving contacts 44, two The auxiliary moving contact 44 is parallel to the both sides of the moving contact 4, to improve specified current capacity, the auxiliary moving contact 44 The distance between stationary contact 22 of movable contact and the static contact 2 is more than the movable contact 42 of the moving contact 4 and the static contact 2 The distance between stationary contact 22, auxiliary moving contact 44 is first divided with static contact 2 and close afterwards, in favor of electric arc the starting the arc and disjunction all Completed at moving contact 4, namely when moving contact 4 is contacted with static contact 2, the movable contact 42 of moving contact 4 and the stationary contact of static contact 2 Point 22 first contacts, and aids in the movable contact of moving contact 44 to divide with being contacted after the stationary contact 22 of static contact 2 in moving contact 4 and static contact 2 From when, the movable contact of auxiliary moving contact 44 is first separated with the stationary contact 22 of static contact 2, the movable contact 42 of moving contact 4 and static contact 2 Stationary contact 22 after separate, specifically, auxiliary moving contact 44 is synchronized with the movement with moving contact 4, auxiliary moving contact 44 is equipped with being used for The movable contact for being in contact or being separated with the stationary contact 22 of static contact 2, aids in being not provided with arc ignition face, static contact 2 on moving contact 44 Stationary contact 22 width be equal to or slightly greater than the movable contact 42 of moving contact 4 and two auxiliary moving contact 44 movable contact width The sum of degree.Certainly, moving contact connected in parallel can be also not provided with the both sides of moving contact 4, to adapt to low specified current-carrying specification Breaker, at this time, the width of the movable contact 42 of moving contact 4 are equal to the width of the stationary contact 22 of static contact 2.

When the moving contact 4 of the low-voltage circuit breaker of the utility model is in contact with static contact 2, such as Fig. 8 A, Fig. 8 B and Fig. 9 institutes Show, the flow direction of electric current I is successively after the conducting base 21 of static contact 2, reverse matrix 211, stationary contact 22, movable contact 42 to dynamic The conducting rod 41 of contact 4, when moving contact 4 is separated with static contact 2, the movable contact 42 of moving contact 4 and the stationary contact 22 of static contact 2 Between produce electric arc, according to the right-hand rule, the electric current in conducting base 21 is formed vertically in the region of the top of conducting base 21 The outside magnetic field G of paper, while according to left hand rule, magnetic field G generates electric arc the Lorentz force away from 3 direction of arc-chutes, It is unfavorable for electric arc to move to 3 direction of arc-chutes；Based on the setting (according to the right-hand rule) in U-shaped poly- magnetic portion 25, conducting base 21 is worn The poly- magnetic closed loop (namely coil) with gap that U-shaped poly- magnetic portion 25 is formed with bottom striking grid 31 is crossed, in the gap location shape Into strong leakage magnetic field E, make electric arc 5 quickly mobile towards arc-chutes 3 under the attraction of magnetic field E and elongate, and in the effect of magnetic field E Under, bottom striking grid 31 is magnetized and discharges magnetic field F in its slotted zone, and electric arc 5 is under the action of the F of magnetic field (according to left hand Rule) it is subject to Lorentz force towards 3 direction of arc-chutes, electric arc 5 is quickly moved to 3 direction of arc-chutes；Meanwhile bottom striking Grid 31, the first striking portion 23 of static contact 2 and poly- magnetic patch 24 are respectively positioned on the region of the top of conducting base 21, and by magnetic conduction Material is made, and absorbable magnetic field G simultaneously discharges the vertical paper for being conducive to electric arc and being moved to 3 direction of arc-chutes in respective top Magnetic field H inwards, and the electric current in reverse matrix 211 is in the vertical of the top (namely arc zone) of reverse matrix 211 formation The magnetic field H of paper inwards, makes magnetic field H be strengthened, and Lorentz forces of the magnetic field H to electric arc towards 3 direction of arc-chutes, is conducive to electricity Arc is quickly moved along the first striking portion 23 and the second striking portion 43 to 3 direction of arc-chutes.

By test of many times, as shown in Figure 10, when moving contact 4 is opened, E, magnetic field F, magnetic field H and arc-chutes in magnetic field Under the action of 3, the electric arc resulted from the stationary contact 22 of static contact 2 and the movable contact 42 of moving contact 4 can be from stationary contact 22 Quickly being moved to bottom striking grid 31 along the lower end 232 of the first arc ignition face 231, the first striking portion 23, (electric arc is from stationary contact 22 To the striking point 311 of bottom striking grid 31, open away from be changed into striking open away from, it is opened away from increase 20mm, namely mounting surface 212 to 3rd distance L3 of bottom striking grid 31 is 20mm), and from movable contact 42 top is quickly moved to along the second arc ignition face 431 (the grid main body 331 of electric arc automated contact 42 to top striking grid 33, opens and opens away from it away from being changed into striking striking grid 33 Open away from increase 29mm), electric arc 5 is moved into elongating arc 6, it is 83mm that the striking of elongating arc 6, which is opened away from L6, compared to initial The 34mm's of electric arc 5 opens away from L5, is elongated 49mm, namely the electric arc 5 when low-voltage circuit breaker disconnects significantly is elongated 144%.The utility model can make the length that the electric arc 5 of the movable contact 42 for the stationary contact 22 and moving contact 4 for resulting from static contact 2 elongates Spend longer, the striking for obtaining bigger is opened away from realizing single-break structure high breaking voltage, and after electric arc 5 is quickly mobile, can effectively subtract The scaling loss of few stationary contact 22 and movable contact 42, improves the electrical endurance number of breaker.

The utility model is by the first striking portion 23 tilted down of static contact 2, by the electric arc at stationary contact 22 along First arc ignition face 231 in one striking portion 23 is quickly moved at the bottom striking grid 31 of arc-chutes 3, while passes through moving contact 4 Acclivitous second striking portion 43, the electric arc at movable contact 42 is quick along second arc ignition face 431 in the second striking portion 43 It is moved at the top striking grid 33 of arc-chutes 3, and by making static contact 2 pass through U-shaped poly- magnetic portion 25 and U-shaped poly- magnetic portion 25 The lower section of bottom striking grid 31 is placed in, makes to form high-intensity magnetic field E between U-shaped poly- magnetic portion 25 and bottom striking grid 31, electric arc 5 exists Quickly moved to 3 direction of arc-chutes under the action of the E of the magnetic field, to realize electric arc in the case where not lengthening 4 length of moving contact Quick mobile and elongation, lifts the operating voltage and breaking capacity of low-voltage circuit breaker, small, low in energy consumption.

The above is only the preferred embodiment of the utility model, and not the utility model is done in any form Limitation, although the utility model has been disclosed with preferred embodiment as above, but is not limited to the utility model, any affiliated Has usually intellectual in technical field, in the range of technical solutions of the utility model are not departed from, when using the disclosure above Technology contents make a little change or be modified to the equivalent embodiments of equivalent variations, as long as being without departing from the utility model technology The content of scheme, any simple modification made according to the technical essence of the utility model to above example, equivalent variations with Modification, in the range of still falling within technical solutions of the utility model.

Claims (11)

1. a kind of low-voltage circuit breaker, it is characterised in that the low-voltage circuit breaker includes：

Static contact, it is fixedly arranged on pedestal, and the static contact is arranged in U-shaped poly- magnetic portion, and the end of the static contact is equipped with downwards The first striking portion of extension is tilted, the first striking portion is located at the top in the U-shaped poly- magnetic portion；

Moving contact, its can rotate positioned at the top of the static contact, the moving contact is in contact with the static contact or phase point From the free end of the moving contact is equipped with the second striking portion of the extension that is inclined upwardly；

Arc-chutes, it is fixedly arranged on the pedestal, and top striking grid and bottom striking grid are equipped with the arc-chutes, described Striking grid in bottom is located at the top in the U-shaped poly- magnetic portion and, the top striking grid energy opposite with the first striking portion It is opposite with the second striking portion.

2. low-voltage circuit breaker according to claim 1, it is characterised in that the static contact includes conducting base, described to lead One end of electric matrix is equipped with reverse matrix, and the conducting base is arranged in the U-shaped poly- magnetic portion, and the reversely matrix is positioned at described The top of conducting base, the first striking portion are fixedly arranged on the reverse matrix.

3. low-voltage circuit breaker according to claim 2, it is characterised in that the moving contact includes conducting rod, the conduction What one end of bar can rotate is fixedly arranged on control mechanism, and the other end of the conducting rod is equipped with movable contact, described reversely to be set on matrix There is mounting surface, the mounting surface is equipped with the stationary contact that can be in contact with the movable contact.

4. low-voltage circuit breaker according to claim 3, it is characterised in that the bottom striking grid is located at the stationary contact Lower section, the bottom striking grid is opposite with the lower end in the first striking portion and has the first distance therebetween；It is described Striking grid in top is located at the top of the movable contact, and the top striking grid includes grid main body and from the grid main body The striking ennation extended downwardly, opens up to maximum position in the moving contact, the striking ennation with The upper end in the second striking portion is opposite and has second distance therebetween.

5. low-voltage circuit breaker according to claim 4, it is characterised in that first distance is 0.5mm-4mm, described the Two distances are 1mm-3mm.

6. low-voltage circuit breaker according to claim 3, it is characterised in that put down the baseplane of the mounting surface and the pedestal OK, or the mounting surface and the pedestal baseplane it is at an acute angle.

7. low-voltage circuit breaker according to claim 2, it is characterised in that between the conducting base and the reversely matrix Equipped with that can absorb, electric current formed in the conducting base to be unfavorable for vertical paper that electric arc moved to arc-chutes direction outside The poly- magnetic patch in magnetic field, the poly- magnetic patch are made of permeability magnetic material.

8. low-voltage circuit breaker according to claim 2, it is characterised in that the conducting base and the bottom striking grid Between be equipped with insulating boot, the insulating boot is located at the top in the U-shaped poly- magnetic portion.

9. low-voltage circuit breaker according to claim 1, it is characterised in that the first striking portion is made of permeability magnetic material, The bottom striking grid is made of permeability magnetic material.

10. low-voltage circuit breaker according to claim 1, it is characterised in that the indoor front side of the arc extinguishing and rear side difference Equipped with one made of gas exhausted material arc insulating cover, the stationary contact of the movable contact of the moving contact and the static contact be respectively positioned on two Between the arc insulating cover, the arc insulating cover and the distance of the side of the static contact are less than the arc insulating cover and the moving contact The distance of side.

11. low-voltage circuit breaker according to claim 1, it is characterised in that the moving contact of the low-voltage circuit breaker further includes Two auxiliary moving contacts, two auxiliary moving contacts are parallel to the both sides of the moving contact, and the dynamic of auxiliary moving contact touches Point and the distance between stationary contact of the static contact be more than the moving contact movable contact and the static contact stationary contact it Between distance.