CN202549734U

CN202549734U - High-voltage direct-current contactor for automobile

Info

Publication number: CN202549734U
Application number: CN2012201199748U
Authority: CN
Inventors: 刘海涛
Original assignee: 刘海涛
Current assignee: Zhejiang Hongzhou New Energy Technology Co., Ltd.
Priority date: 2012-03-27
Filing date: 2012-03-27
Publication date: 2012-11-21
Anticipated expiration: 2022-03-27

Abstract

The utility model discloses a high-voltage direct-current contactor for an automobile. The high-voltage direct-current contactor for the automobile comprises an iron core which is arranged at the internal bottom of a contactor plastic shell. A movable shaft is fixed in the middle of the iron core. A restoring spring is arranged on the movable shaft. A coil is arranged outside the iron core. An inner frame is arranged above the iron core. The movable shaft penetrates through the lower part of the inner frame and stretches into the inner frame. A movable contact plate is fixedly arranged at the upper end part of the movable shaft. Two contacts are arranged at the two ends of the movable contact plate. Vertical lead terminals are respectively arranged above the contacts. The high-voltage direct-current contactor for the automobile is characterized in that permanent magnets are respectively arranged on the left side and the right side of the lower bottom surface of the inner frame, the directions of the magnetic fields of the permanent magnets are consistent, and the direction of the magnetic fields of the permanent magnets are in parallel with the extension directions of the two contacts. Since the directions of the magnetic fields of the permanent magnets are arranged to be in parallel with the extension directions of the contacts of the movable contact plate, no matter which directions of generated arcs are, two arcs can be guided towards two different directions to extinguish the arcs without paying attentions to the polarities of the lead terminals.

Description

Automobile HVDC contactor

Technical field

The utility model relates to a kind of contactor, especially a kind of non-polar automobile HVDC contactor.

Background technology

The contactor that automobile is used is meant that utilizing coil to flow through electric current produces magnetic field, makes contact closure, realizes efficient power transfer.Contactor commonly used is made up of electromagnetic system (moving unshakable in one's determination, fixed core, solenoid), contact system and arc-control device.After the solenoid energising of contactor, can produce very strong magnetic field, make fixed core produce electromagnetic attraction and attract moving iron core, and drive the contact action: contact closure; When coil blackout, electromagnetic attraction disappears, moving release under the effect of retracting spring unshakable in one's determination, and contact is restored: contact breaks off.

Contact can produce electric arc in make and break process, the high temperature that electric arc produces can make the contact burning deceive, burn, singe and produce metallic particles, directly influences the useful life of contactor.General HVDC contactor generally is used for the novel energy automobile, fields such as inverter, and electric current can reach 200A or higher, and then between 500V-900V, when voltage was increasingly high, it is more and more serious that the problem of electric arc also becomes for voltage.One of method that solves electric arc is to adopt magnetic quenching.Existing magnetic quenching device, the magnetic field that common two magnetic conductive boards (permanent magnet) produce is vertical with the line direction of two contacts.Under the normal condition, the active force that the magnetic field that magnetic conductive board produces produces electric arc makes electric arc stretch to the outside of contactor, and this is favourable for arc extinguishing.In case but the both positive and negative polarity misconnection, the direction of electric arc changes, and the active force that the magnetic field of generation produces electric arc makes the centre pull of electric arc to contactor; At this moment electric arc can might be met and discussed; Not only can not arc extinguishing, can cause on the contrary can not current interruption, causes contactor to damage; Damage to contact is extremely serious, makes life-span of contactor only can reach several times the level to tens times.

The utility model content

The utility model technical problem to be solved provides a kind of automobile HVDC contactor of simple in structure, long service life.

The utility model solves the problems of the technologies described above the technical scheme that is adopted: a kind of automobile HVDC contactor, comprise the iron core that is arranged on the contactor plastic casing inner bottom part, and said center fixed unshakable in one's determination has moving axis; Said moving axis is provided with return spring, and said iron core is outside equipped with coil, and said top unshakable in one's determination is provided with inner frame; The bottom that said moving axis passes said inner frame extends in the said inner frame; The upper end of said moving axis is fixed with movable contact spring, and the two ends of said movable contact spring have two contacts, and said contact top is respectively equipped with vertical stem; It is characterized in that; The left and right sides of said inner frame bottom surface is respectively equipped with permanent magnet, and the magnetic direction of said permanent magnet is consistent, and the magnetic direction of said permanent magnet is parallel with the bearing of trend of said two contacts.

Forward and backward both sides between said two permanent magnets are respectively arranged with the crack chip module; The crack sheet orientation of said crack chip module is identical with the magnetic direction of said permanent magnet; The electric arc that permanent magnet the stretches crack sheet that leads thus, by the crack sheet with arc cutting to carry out arc extinguishing.

Being full of in the said inner frame has high-pressure inert gas, can reduce the generation of electric arc further.

Said inner frame and said coil are coated with iron-clad, and said iron-clad is provided with plastic casing outward, pass through the epoxy resin glue sealing between said iron-clad and the said plastic casing.Advantage high temperature resistant, cold-resistant thermal shock that the sealing material has makes that whole contactor air-tightness is good, fail safe is good, can be in the work down of harmful and explosive environment, and like the environment of saline and alkaline, moist, dust etc., coil and movable contact spring can oxidized and pollutions.

Compared with prior art; The advantage of the utility model is: it is parallel with the contact bearing of trend of movable contact spring to be set to magnetic direction through permanent magnet; No matter the electric arc that make to produce thus is direction why; Can both be with two different directions of two electric arcs guiding carrying out arc extinguishing, and do not have the polarity that notes stem; The crack sheet especially also is set, can assists the further arc extinguishing of permanent magnet; In the environment that electric arc produces, being full of has inert gas, can reduce the generation of electric arc; To sealing in the contactor, make contactor air-tightness and fail safe all better with epoxy resin glue.So the utility model adopts multiple arc extinguishing structure, can reduce the influence of electric arc to product greatly, thereby can improve the fail safe that product uses, prolong the useful life of product, and simple in structure, cost is low.

Description of drawings

Fig. 1 is the cutaway view of the contactor of the utility model;

Fig. 2 be among Fig. 1 A-A to sketch map;

Fig. 3 be among Fig. 1 B-B to perspective view.

Embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

Referring to Fig. 1-Fig. 3, a kind of automobile HVDC contactor comprises the iron core 1 that is arranged on contactor plastic casing 12 inner bottom parts, and 1 center fixed unshakable in one's determination has moving axis 2, and moving axis 2 is provided with return spring 21; Unshakable in one's determination 1 is outside equipped with bobbin 3, and coil is wound on the coil rack 3, is provided with guideway 4 between iron core 1 and the coil rack 31, is used to guide unshakable in one's determination 1 motion.1 top unshakable in one's determination is provided with iron plate 5, and the magnetic line of force that makes coil produce passes iron plate 5 and forms magnetic loop.

Iron plate 5 tops are provided with inner frame 6, and wherein, the left and right sides of inner frame 6 bottom surfaces is respectively equipped with the magnetic direction unanimity of 7, two permanent magnets 7 of permanent magnet.Forward and backward both sides between two permanent magnets 7 are respectively arranged with crack chip module 8, and crack sheet 81 orientations of crack chip module 8 are identical with the magnetic direction of permanent magnet 7.

The bottom that moving axis 2 passes iron plate 5 and inner frame 6 extends in the inner frame 6; The upper end of moving axis 2 is fixed with movable contact spring 9; The two ends of movable contact spring 9 have two

contacts

91,92; Contact 91,92 tops are respectively equipped with vertical stem 10, and stem 10 is fixed with inner frame 6 tops, and extends outside the plastic casing 12 of contactor.The bearing of trend of 9 two contacts of the magnetic direction of permanent magnet 7 and

movable contact spring

91,92 is parallel.

Inner frame 6 and coil are coated with iron-clad 11; Plastic casing 12 is arranged on outside the iron-clad 11, thus with external insulation, seals through encapsulant between iron-clad 11 tops and the plastic casing 12; Encapsulant is a kind of epoxy resin glue of black preferably; Have advantage high temperature resistant, cold-resistant thermal shock, make that whole contactor air-tightness is good, fail safe is good, can under harmful and explosive environment, work; Like the environment of saline and alkaline, moist, dust etc., coil and movable contact spring 9 can be oxidized and be polluted.

When making contactor, inner frame 6 inside are evacuated earlier, removing inner dusty gas, and guarantee that contactor can not leak, and in inner frame 6, charge into high-pressure inert gas then, like nitrogen, to reduce the generation of electric arc.

Under the nature, movable contact spring 9 does not contact with stem 10.Behind coil electricity, unshakable in one's determination 1 axially moves upward under the effect in magnetic field, drives moving axis 2 thus and axially moves upward.The movable contact spring 9 of moving axis 2 upper ends axially moves upward thus thereupon, makes two

contacts

91,92 upwards contact conducting with stem 10; Behind coil blackout, magnetic field disappears, and unshakable in one's determination 1 does not receive the power in magnetic field, and moving axis 2 axially moves downward under the resilience force effect of return spring 21.The movable contact spring 9 of moving axis 2 upper ends is axial downward movement thereupon thus, make two

contacts

91,92 downwards with stem 10 disconnections.

Above-mentioned movable contact spring 9 and stem 10 contact with the disconnection process in, can produce electric arc.When electric arc produces, for example, see from Fig. 1; Direction be stem 10, movable contact spring 9 from the left side to the stem 10 on right side, the magnetic direction that permanent magnet 7 produces is that left side from inner frame 6 is to the right side (also can from the right side to the left side), according to left hand rule; The stem 10 in left side receives the outwards power of (outside from paper) with the electric arc that contact 91 produces; The stem 10 on right side receives the inwardly power of (inside from paper) with the electric arc that contact 92 produces, electric arc in the opposite direction, and can not collide.The crack chip module 8 that is stretched to both sides after electric arc is stressed is cut off by the crack sheet, thus arc extinguishing.When electric arc produces, for example, see from Fig. 1; Direction is that stem 10, movable contact spring 9 from the right side is to the stem 10 in left side; According to left hand rule, the stem 10 in left side receives the inwardly power of (inside from paper) with the electric arc that contact 91 produces, and the stem 10 on right side receives the outwards power of (outside from paper) with the electric arc that contact 92 produces; Electric arc in the opposite direction, and can not collide.

This shows no matter produce the electric arc of which direction, the situation that electric arc is collided can not occur, can both carry out arc extinguishing.Not only make things convenient for operation, also improved the fail safe in the use, prolonged useful life.

The above is merely the preferred implementation of the utility model; Should be pointed out that for those of ordinary skill in the art, do not breaking away under the principle prerequisite of the utility model; Can also make various deformation and improvement, this also should be regarded as the protection range of the utility model.

Claims

1. automobile HVDC contactor; Comprise the iron core (1) that is arranged on contactor plastic casing (12) inner bottom part, said iron core (1) center fixed has moving axis (2), and said moving axis (2) is provided with return spring (21); Said iron core (1) is outside equipped with coil; Said iron core (1) top is provided with inner frame (6), and the bottom that said moving axis (2) passes said inner frame (6) extends in the said inner frame (6), and the upper end of said moving axis (2) is fixed with movable contact spring (9); The two ends of said movable contact spring (9) have two contacts (91,92); Said contact (91,92) top is respectively equipped with vertical stem (10), it is characterized in that the left and right sides of said inner frame (6) bottom surface is respectively equipped with permanent magnet (7); The magnetic direction of said permanent magnet (7) is consistent, and the magnetic direction of said permanent magnet (7) is parallel with the bearing of trend of said two contacts (91,92).

2. automobile HVDC contactor as claimed in claim 1; It is characterized in that; Forward and backward both sides between said two permanent magnets (7) are respectively arranged with crack chip module (8), and crack sheet (81) orientation of said crack chip module (8) is identical with the magnetic direction of said permanent magnet (7).

3. according to claim 1 or claim 2 automobile HVDC contactor is characterized in that being full of in the said inner frame (6) has high-pressure inert gas.

4. automobile HVDC contactor as claimed in claim 3; It is characterized in that; Said inner frame (6) and said coil outer (3) are coated with iron-clad (11); Said iron-clad (11) is outer to be provided with plastic casing (12), passes through the epoxy resin glue sealing between said iron-clad (11) and the said plastic casing (12).