CN202230963U

CN202230963U - Stationary contact system of circuit breaker

Info

Publication number: CN202230963U
Application number: CN2011204011793U
Authority: CN
Inventors: 袁夫生; 邹海洋; 吴双龙; 陈百胜
Original assignee: Delixi Electric Co Ltd
Current assignee: Delixi Electric Co Ltd
Priority date: 2011-10-20
Filing date: 2011-10-20
Publication date: 2012-05-23
Anticipated expiration: 2021-10-20

Abstract

The utility model relates to a circuit breaker, in particular to a stationary contact system of the circuit breaker. According to the technical scheme, the stationary contact system of the circuit breaker is characterized in that: a stationary contact comprises a connection end and a contact end, wherein the connection end of the stationary contact is arranged at the bracket of the stationary contact through a rotary support shaft and a reset torsional spring; the contact end of the stationary contact is arranged on the upper side of a connection plate; the stationary contact is arranged on the connection plate through the bracket of the stationary contact, and then each of two isolated opposite surfaces is formed on each of the stationary contact and the connection plate; a movable iron core is fixedly arranged on the isolated opposite surface of the stationary contact; and a stationary iron core matched with the movable iron core on the stationary contact is fixedly arranged on the isolated opposite surface or the reverse side of the isolated opposite surface of the connection plate. By adoption of the scheme, an electromagnetic suction structure is arranged on the conventional stationary contact system, so a novel stationary contact system of the circuit breaker, which can improve the limiting capacity of the short-circuit current of contacts, is provided.

Description

A kind of fixed contact system of circuit breaker

Technical field

The utility model relates to a kind of circuit breaker, is meant the fixed contact system on the circuit breaker especially.

Background technology

The flow restriction of the fixed contact system of existing circuit breaker; Be mainly " U " type structure, the generation electrodynamic repulsion force in the opposite direction that this structure mainly flows through fixed contact and moving contact by electric current is scolded and is started contact or fixed contact, and its stroke of scolding out along with contact of this structure is big more; Electrodynamic repulsion force can be more little; When electrodynamic repulsion force is reduced to when having overcome not the touch spring counter-force, contact can fall again, is unfavorable for the contact blow-out.

Summary of the invention

The utility model overcomes the problem that prior art exists, and on existing basis, increases a kind of electromagnetic attraction structure newly, the fixed contact system of the novel circuit breaker of the current limiting capacity of raising contact short circuit current.

Realize above-mentioned purpose; The utility model adopts following technical scheme: a kind of fixed contact system of circuit breaker; Include connecting plate, stationary contact bracket and fixed contact; Wherein fixed contact is arranged on the connecting plate through stationary contact bracket; Realize being electrically connected through flexible connection between fixed contact and the connecting plate, it is characterized in that: said fixed contact includes link and tip side, and the link of said fixed contact is arranged on the stationary contact bracket through swivel bearing axle and reduction torsion spring; Said stationary contact bracket is fixedly installed on an end of connecting plate; The tip side of said fixed contact places the connecting plate upside, and said stationary contact bracket is provided with the limit shaft that can rotate to the moving contact of breaker side when the initial position with fixed contact link conflict engagement limits fixed contact, and said fixed contact is arranged on through stationary contact bracket that the back fixed contact forms an isolation opposite face respectively with connecting plate on the connecting plate; Be set with moving iron core on the isolation opposite face of said fixed contact, be set with on the isolation opposite face of said connecting plate or on the reverse side of the isolation opposite face of connecting plate with fixed contact on the static iron core that cooperates of moving iron core.

Through adopting such scheme; The present invention increases a kind of electromagnetic attraction structure; When short circuit current when being arranged on the static iron core of connecting plate bottom; Moving iron core on magnetic field adhesive fixed contact of static iron core moment generation; Thereby the effect that moving iron core drive fixed contact overcomes reduction torsion spring is down moved, and fixed contact is near from static iron core more, and its magnetic field is big more; The speed that fixed contact down moves is just fast more; Solved the defective of electrodynamic repulsion force structure, thereby improved the current limiting capacity of contact short circuit current, the present invention scolds out fixed contact to move downward to draw back electric arc except the generation electrodynamic repulsion force in the opposite direction that can utilize short circuit current and flow through fixed contact and moving contact and carries out the short circuit current limitation; Can also before electric current does not reach fixed contact, can flow through electric current through the static iron core that is arranged on the connecting plate bottom and produce electromagnetism magnetic field; Thereby inhale moving be arranged on the fixed contact moving iron core down rapid movement shorten product disjunction arcing time limiting short-circuit current, move downward fast under can two power synthesis during the fixed contact short circuit of this fixed contact system and draw back electric arc, thereby shorten the product disjunction arcing time, reduction product short circuit Joule integral energy improves its current limiting capacity through electromagnetic attraction and electrodynamic repulsion force.

The further setting of the utility model is: be set with moving iron core guard shield on the said fixed contact; Said moving iron core guard shield comprises a dual-side and a top margin; One of formation supplies the breach that expose the contact of fixed contact between dual-side and the top margin; Extend respectively on the said dual-side and be provided with baffle plate, this baffle plate covers on the part that is exposed to fixed contact of moving iron core, and said static iron core fixedly installs on the reverse side of isolation opposite face of connecting plate; Its both sides of static iron core are wider than connecting plate and are partly constituted blocking arm to the bending of fixed contact direction, can be inconsistent with the blocking arm of static iron core when the width of said moving iron core and the width of static iron core quite descend down to the moving iron core of formation; The fixed contact place of pressing close to fixed contact on the said connecting plate is provided with arc leading angle, is covered with protective cover on the said stationary contact bracket.

The purpose that further is provided with is, takes into full account to set on the basis of properties of product superiority, and wherein moving iron core guard shield prevents that electric arc burn from moving iron core.

Below in conjunction with accompanying drawing the utility model is further described.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment;

Fig. 2 is the explosive view of Fig. 1;

Fig. 3 is the moving iron core shield structure sketch map among the utility model embodiment;

Fig. 4 is the moving core structure sketch map among the utility model embodiment;

Fig. 5 is the static iron core structural representation among the utility model embodiment.

Embodiment

Like Fig. 1-shown in Figure 5; A kind of fixed contact system of circuit breaker; Include connecting plate 1, stationary contact bracket 2 and fixed contact 3; Wherein fixed contact 3 is arranged on the connecting plate 1 through stationary contact bracket 2; Realize being electrically connected through flexible connection 4 between fixed contact 3 and the connecting plate 1, in the utility model embodiment, said fixed contact 3 includes link 31 and tip side 32; The link 31 of said fixed contact 3 is arranged on the stationary contact bracket 5 through swivel bearing axle 6 and reduction torsion spring 5; Said stationary contact bracket 5 is fixedly installed on an end 11 of connecting plate 1, and the tip side 32 of said fixed contact 3 places connecting plate 1 upside, said stationary contact bracket 5 be provided with can with fixed contact 3 links 31 conflict engagement limits fixed contacts 3 limit shaft 103 to moving contact of breaker 102 when the initial position; The initial position here is meant the circuit breaker position of fixed contact 3 under normal circumstances; Said fixed contact 3 is arranged on the connecting plate 1 back fixed contact 3 through stationary contact bracket 5 and forms one respectively with connecting plate 1 and isolate opposite face, is set with moving iron core 7 on the isolation opposite face 33 of said fixed contact 3, be set with on the reverse side 13 of the isolation opposite face 12 of said connecting plate 1 with fixed contact 3 on the static iron core 8 that cooperates of moving iron core 7; Static iron core 8 its both sides are wider than connecting plate 1 part and are constituted blocking arm 81 to the bending of fixed contact 3 directions; Can be inconsistent when the width of the width of said moving iron core 7 and static iron core 8 quite descends down to the moving iron core 7 of formation with the blocking arm 81 of static iron core 8, in the utility model embodiment, we also can be arranged on static iron core 8 on the isolation opposite face 12 of connecting plate 1.

In the utility model embodiment; Be set with moving iron core guard shield 9 on the said fixed contact 3; Said moving iron core guard shield 9 comprises a dual-side 91 and a top margin 92, and one of formation supplies the breach 93 that expose the contact of fixed contact 3 between dual-side 91 and the top margin 92, extends respectively on the said dual-side 91 to be provided with baffle plate 911; This baffle plate 911 covers on the part that is exposed to fixed contact 3 of moving iron core 7; The purpose that is provided with like this is to prevent that fully electric arc burn from moving iron core 7, and the fixed contact place of pressing close to fixed contact 3 on the said connecting plate 1 is provided with arc leading angle 10, is covered with protective cover 101 on the said stationary contact bracket 2

Concrete operation logic: when circuit big short circuit current occurs when connecting plate 1 flows to fixed contact 3; During short circuit current process static iron core 8 ends; Static iron core 8 is given birth to electromagnetism magnetic field, and the moving iron core 7 on the fixed contact 3 is magnetized, and fixed contact 3 overcomes reduction torsion spring 5 counter-forces; Rotate for 6 times around fixed contact swivel bearing axle, touch the blocking arm 81 of static iron core 8; When short circuit current flows to the moving contact 102 of circuit breaker and since from fixed contact 3 during to moving contact 102 sense of current be incorgruous, can also produce an electrodynamic repulsion force, the counter-force of scolding out fixed contact 3 to overcome fixed contact reduction torsion spring 5 is down moved.When short circuit current disappeared, fixed contact 3 reset to fixed contact 3 initial conditions under the effect of fixed contact reduction torsion spring 5, and the initial condition of fixed contact 3 is carried out spacing through fixed contact 3 limit shafts 103.

Claims

1. the fixed contact system of a circuit breaker; Include connecting plate, stationary contact bracket and fixed contact; Wherein fixed contact is arranged on the connecting plate through stationary contact bracket; Realize being electrically connected through flexible connection between fixed contact and the connecting plate; It is characterized in that: said fixed contact includes link and tip side; The link of said fixed contact is arranged on the stationary contact bracket through swivel bearing axle and reduction torsion spring, and said stationary contact bracket is fixedly installed on an end of connecting plate, and the tip side of said fixed contact places the connecting plate upside; Said stationary contact bracket is provided with the limit shaft that can rotate to the moving contact of breaker side when the initial position with fixed contact link conflict engagement limits fixed contact; Said fixed contact is arranged on the connecting plate back fixed contact through stationary contact bracket and forms an isolation opposite face respectively with connecting plate, is set with moving iron core on the isolation opposite face of said fixed contact, be set with on the isolation opposite face of said connecting plate or on the reverse side of the isolation opposite face of connecting plate with fixed contact on the static iron core that cooperates of moving iron core.

2. the fixed contact system of circuit breaker according to claim 1; It is characterized in that: be set with moving iron core guard shield on the said fixed contact; Said moving iron core guard shield comprises a dual-side and a top margin; One of formation supplies the breach that expose the contact of fixed contact between dual-side and the top margin; Extend respectively on the said dual-side and be provided with baffle plate, this baffle plate covers on the part that is exposed to fixed contact of moving iron core, and said static iron core fixedly installs on the reverse side of isolation opposite face of connecting plate; Its both sides of static iron core are wider than connecting plate and are partly constituted blocking arm to the bending of fixed contact direction, can be inconsistent with the blocking arm of static iron core when the width of said moving iron core and the width of static iron core quite descend down to the moving iron core of formation.

3. the fixed contact system of circuit breaker according to claim 1 and 2, it is characterized in that: the fixed contact place of pressing close to fixed contact on the said connecting plate is provided with arc leading angle, is covered with protective cover on the said stationary contact bracket.