CN2786761Y

CN2786761Y - Novel magnetic breaker

Info

Publication number: CN2786761Y
Application number: CN 200520090697
Authority: CN
Inventors: 彭凯
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-05-10
Filing date: 2005-05-10
Publication date: 2006-06-07
Anticipated expiration: 2015-05-10

Abstract

The utility model relates to a novel magnetic field breaker which comprises a bracket, an arc extinction cover, a normally closed contact, a conductive strip, a permanent magnetism blast system and a separating and switching transmission system. The utility model is characterized in that two round blast permanent magnets of the permanent magnetism blast system are respectively installed on both sides of a moving arc contact and a static arc contact; the moving contact is installed on a crank arm which is connected to a holding element through an axle pin; the holding element and a baffle plate are fixed on an insulation square shaft, and a contact pressure spring is installed between the crank arm and the baffle plate; the switching transmission system is provided with a static iron core and a magnetic yoke, and a switching coil and a trip coil are arranged in the magnetic yoke; a permanent magnet is assembled on one side of the trip coil, and the moving iron core is assembled in the center of the switching coil and the trip coil; a reaction spring is arranged between the moving iron core and the static iron core, and the moving iron core is connected to the insulation square shaft through the crank arm. The utility model has the advantages that a blast magnetic field is constant, and the break contact broken can blast reliably with the small electricity; the switching transmission system closes the electromagnetism closing, keeps permanent magnetism, and prevents the phenomenon of failure of operation because of the mechanical friction clamping; the breaker has simple machinery, and the components are reduced by 70%; the utility model has low failure rate and convenient maintenance.

Description

Novel field circuit breaker

Technical field

The utility model belongs to a kind of appliance switch, particularly a kind of a kind of novel field circuit breaker that belongs to generator excited system.

Background technology

In generator excited system, when orderly closedown and accidental shutdown, the energy in the generator amature need be discharged the arc extinction that produces in the time of simultaneously also will be rapidly with the contact disjunction.Traditional field circuit breaker (also claiming field suppression switch), adopt electromagnetism arc blow-out mode, decide the power in arc blow-out magnetic field by the size of main circuit current, therefore, when unloaded separating brake or little electric current separating brake, caused the weakening or the forfeiture of arc blow-out ability, contact burns very serious, incur loss through delay the normal power generation of generator, economic loss is bigger.Traditional field circuit breaker, the kind of drive that it divides, combined floodgate transmission adopted electromagnetism closes a floodgate, electromagnetism keeps or mechanical lock buckle keeps, be easy to cause the phenomenon of tripping when closing a floodgate unreliable or separating brake to take place, will influence the quality of generator operation like this, cause the comparison serious economy loss.

The utility model content

The purpose of this utility model provides a kind of novel field circuit breaker, and the arc blow-out ability is not subjected to the influence of main circuit current size, and under open-circuit excitation electric current or little current conditions during disjunction, successfully extinguish arcs.

The purpose of this utility model is achieved by the following technical solution: it comprises support, arc-extinguish chamber, normally closed interlock, busbar, permanent magnetism arc blow-out system and branch, combined floodgate drive system, it is characterized in that:

Two circular arc blow-out permanent magnets of permanent magnetism arc blow-out system are installed in the both sides of moving arcing contact and quiet arc contact respectively, moving arcing contact is installed on the rocking arm; rocking arm is connected on the holder by pivot pin, and holder and baffle plate are fixed on the insulation square shaft, and the contact pressure spring is installed between rocking arm and baffle plate.Operation principle: moving arcing contact adopts the permanent magnetism arc blow-out, in the both sides of moving arcing contact, according to the sense of current of major loop, two circular arc blow-out permanent magnets, constitute the permanent-magnetic field (Fig. 3 is seen in the principle signal) of corresponding magnetic direction, use the arc-extinguish chamber that the short arc principle is made, set up stable arc voltage, when being loaded with the arcing contact disjunction of electric current, according to left hand rule, permanent-magnetic field will blow to arc-extinguish chamber with the electric arc between the dynamic and static arcing contact, and energy is change of current demagnetization reliably, reaches the purpose of blow-out.Because permanent-magnetic field has certain magnetic field intensity, though under little electric current also reliable arc blow-out of disjunction.Substitute the electromagnetic field that traditional magnetic direction and intensity and main circuit current change.

Branch, combined floodgate drive system are provided with static iron core and yoke, closing coil and switching winding are housed in the yoke, at switching winding one side assembling permanent magnet, at closing coil and the moving iron core of switching winding center assembling, between moving iron core and the static iron core reaction spring is set, moving iron core connects the insulation square shaft by connecting lever.Operation principle: when closing coil is switched on, move iron core under the effect of electromagnetic force, to the motion of static iron core direction, drive the rotation of insulation square shaft, make the arcing contact closure, the while permanent magnet will move iron core and firmly hold, and keep arcing contact in make position.When switching winding is switched on, produce an electromagnetic field opposite with the permanent magnet magnetic field direction, moving iron core breaks away from static iron core under the effect of reaction spring, drive the insulation square shaft to opposite spin, and arcing contact is disconnected.

The utility model has the advantages that: arc blow-out magnetic field is constant, is not subjected to the influence of main circuit current, break contact arc blow-out reliably under little electric current.Branch, combined floodgate transmission adopted electromagnetism close a floodgate, permanent magnetism keeps, the kind of drive of anti-magnetic separating brake, the phenomenon of fundamentally having got rid of because of the tripping of mechanical friction bite takes place, and mechanical part is simple, compare with traditional electromagnetism operating system, parts reduce about 70%, the fault chance is reduced, and repair and maintenance is convenient.

Description of drawings

Fig. 1 is the utility model field circuit breaker profile schematic diagram.

Fig. 2 is the B-B profile (being permanent magnetism arc blow-out system configuration schematic diagram) of Fig. 1.

Fig. 3 a, b are permanent magnetism arc blow-out schematic diagrams.

Fig. 4 is the A-A profile (i.e. branch, combined floodgate running part structural representation) of Fig. 1.

Embodiment

See Fig. 1 and Fig. 2, the structure of permanent magnetism arc blow-out system: two circular arc blow-out permanent magnets 7 are installed in the both sides of magnetic inductive block 8 respectively, are installed on the busbar 4 by insulator 9.Two circular arc blow-out permanent magnets 7 are positioned at the both sides of moving arcing contact 6 and quiet arc contact 10, dynamic and

static arcing contact

6,10 is positioned at the below of arc-extinguish chamber 2, moving arcing contact 6 is installed on the rocking arm 20 by conducting block 15, moving arcing contact 6 13 links to each other with following busbar 14 by being flexible coupling; rocking arm 20 is connected on the holder 19 by pivot pin 17; baffle plate 16 is connected with holder 19 by bolt 18; be fixed on the square shaft 12 that insulate; contact pressure spring 11 is installed between rocking arm 20 and the baffle plate 16, after the moving arcing contact closure by the pressure of contact pressure spring 11 increase moving arcing contacts.

See Fig. 1,4, divide, the structure of combined floodgate drive system: magnetic is gripped 22 and is fixed on the support 1 by connector, closing coil 23 and switching winding 24 are housed in the yoke 22, at switching winding 24 1 sides assembling permanent magnet 25, at closing coil 23 and the moving iron core 26 of switching winding 24 centers assembling, moving iron core 26 is installed on the guide post 31, between moving iron core 26 and the static iron core 21 reaction spring 27 is set, moving iron core 26 is connected with connecting lever 30 with little 29 by connecting plate 28, and connecting lever 30 is fixed together with insulation square shaft 12.Moving iron core 26 drives insulation square shaft 12 when moving and rotates.In Fig. 1, permanent magnetism arc blow-out system, arc-extinguish chamber 2, normally closed interlock 3, busbar 4 and branch, combined floodgate drive system 5 are assembled on the base support 1, constitute the utility model field circuit breaker.

Claims

1, a kind of novel field circuit breaker, it comprises support, arc-extinguish chamber, normally closed interlock, busbar, permanent magnetism arc blow-out system and branch, combined floodgate drive system, it is characterized in that:

Two circular arc blow-out permanent magnets of permanent magnetism arc blow-out system are installed in the both sides of moving arcing contact and quiet arc contact respectively, moving contact is installed on the rocking arm; rocking arm is connected on the holder by pivot pin, and holder and baffle plate are fixed on the insulation square shaft, and the contact pressure spring is installed between rocking arm and baffle plate;

Branch, combined floodgate drive system are provided with static iron core and yoke, closing coil and switching winding are housed in the yoke, at switching winding one side assembling permanent magnet, at closing coil and the moving iron core of switching winding center assembling, between moving iron core and the static iron core reaction spring is set, moving iron core connects the insulation square shaft by connecting lever.