CN201336252Y

CN201336252Y - High power direct current (DC) contactor

Info

Publication number: CN201336252Y
Application number: CNU2009200668972U
Authority: CN
Inventors: 姜伍华
Original assignee: Jiangsu Boai Electronic Co Ltd
Current assignee: Jiangsu Boai Electronic Co Ltd
Priority date: 2009-01-15
Filing date: 2009-01-15
Publication date: 2009-10-28
Anticipated expiration: 2019-01-15

Abstract

The utility model relates to a high power direct current (DC) contactor which consists of a housing, a positioning mechanism of a static contact, and a movement control system of a moving contact, wherein, a high-strength metal sealing cover clings to the inner surface of the housing; the sealing cover is provided with a cavity; high purity nitrogen gas is filled in the cavity; the movement control system of the moving contact consists of a joint shaft, a compression spring, and a movable iron core with a compression spring limiting hole; and the compression spring which has a function of helping to pullback the moving contact is limited by the limiting hole and a separator plate and sleeved on the joint shaft. As working in an environment with insulating gas, the static and the moving contacts cannot be oxidized, and the gas in the cavity cannot be ionized, thereby reducing the occurrence of damage from electric arc on the surfaces of the contacts; and the DC contactor helps to ensure the effective working life of the contacts, improves the whole work reliability of the contactor self, and prolongs the service life of the contactor, so that the practicality is high.

Description

The high power DC contactor

Technical field

The utility model relates to a kind of dc switch device, the high power DC contactor of particularly a kind of reliable operation and long service life.

Background technology

Contactor is a kind of switching device that control circuit is switched on or switched off that is used for, be widely used in automobile at present, electric motor car, electric control cabinet, in the control system in engineering machinery and wind energy field, along with the development of the comprehensive utilization technique of novel energy, automotive field, the wind energy field needs to use the high voltage control loop more and more.In the prior art, be a quite simple thing with switch cutoff low circuit power, but want the cutoff high ring current just so uneasy.The working contact of existing switch and relay all is in the air ambient works, owing to understand the accelerated oxidation except that own during contact work, itself also can produce electric arc, and under the very high situation of work loop voltage, in contact when work, also can ionization surrounding air when producing electric arc, even so be in released state between the contact, but ionized gas still can make the loop conducting, so under regular situation, be difficult to cut off potential circuit up to the kilovolt level; In addition, contact being pulled away from the process after connecting high-current circuit also can produce the arcing phenomenon, causes the contact surface major injury, and the surface is uneven, and this contact that has damaged also can produce point discharge phenomenon, thereby have a strong impact on the useful working life of existing switch and relay.So consider from practicality and economy angle, all owe desirable.

Summary of the invention

The purpose of this utility model is an existing weak point will overcome existing switch and relay and be used for the cutoff high power circuit time, provide a kind of and can effectively reduce the contact arcing phenomenon in when work, help improving functional reliability and prolong the novel high power DC contactor that uses working life.

High power DC contactor of the present utility model is achieved in that at first the high power DC contactor increase to prior art is provided with the seal isolation cover, has insulation function but the high-purity nitrogen that do not have the ionization function to the filling of contact operation interval then, simultaneously, actuating mechanism to moving contact is carried out structural adjustment, and utilize the Electromagnetic Control method to increase the dynamics of pulling back of contact, realize reducing arc phenomenon, improve and draw back second cosmic velocity, guarantee the useful working life of contact and the working life that prolongs the high power DC contactor.

Based on the high power DC contactor main body of the present utility model of said method by the housing of band fixed mounting, the fixed contact detent mechanism that links to each other with the operating circuit electrode and specifically carry out and fixed contact between the closed moving contact motion control system that is switched on or switched off circuit function constitute, be characterised in that: be close to increase on the described shell inner surface and be provided with the high duty metal seal closure that is filled with high-purity nitrogen in the chamber; Described moving contact motion control system by an end be fixedly installed on compression spring and on couple axle on the moving contact center, another close end that suit is fixedly installed on couple axle be movably arranged in the centre bore of solenoid and be fixedly installed on another end of couple axle, the moving iron core of interior band compression spring spacing hole constitutes.

Under confined state, one end of described compression spring is stretched in the spacing hole of putting on described moving iron core, the other end is spacing by the dividing plate that is arranged between solenoid and contact working chamber, suit is arranged on the couple axle, during work, moving contact is in company with couple axle and moving iron core the flowed through sense of current and the size control of solenoid, do displacement up and down, realize carrying out and contact closed circuit with fixed contact, energized or be pulled away from the fixed contact open circuit, the action of cutting off the electricity supply, be arranged on the end that couple axle is positioned at the close moving iron core of solenoid owing to will compress spring, compression spring pressurized when on fixed contact is controlled, moving, the savings energy, when fixed contact controlled when drop-down, the compression spring releases energy, and helps being pulled away from fast of fixed contact.

The utility model high power DC contactor based on above-mentioned design, owing to be close on the shell inner surface to increase to be provided with to be filled with in the chamber and have insulation function, but the high duty metal seal closure that does not have ionization function high-purity nitrogen, and in the moving contact motion control system, rationally adjusted the position that is provided with of compression spring, the utility model high power DC contactor can be reached: guarantee that fixed contact and moving contact are in and have insulation function, do not work but do not have in the environment of high-purity nitrogen of ionization function, can effectively avoid the oxidation in the dynamic/static contact course of work, avoid taking place between dynamic/static contact connecting the unreliable situation of work of circuit because of gas ionization under the state and the arcing of dynamic/static contact damages phenomenon being pulled away from, help overall work reliability and the prolongation working life guaranteeing the reliably working life-span of dynamic/static contact and improve contactor itself; Simultaneously because contact and coil all are in the environment that is subjected to nitrogen protection works, make contactor have stronger work applicability, not only can be used in the operating circuit of high-voltage great-current, can also be used for as saline and alkaline, moist, work safely under dust etc. and the explosive adverse circumstances, this be existing any a like product can't realize; Be provided with the metallic seal cover though increase, adjusted the part-structure of moving contact control system, technology is slightly improved, but overall the variation not quite, structure is still very simple, cost increases few, with its stronger functional reliability of being brought, longer working life and wider work applicability etc. actively technique effect compare, economy that it is valuable and extremely strong practicality be do not have with opinion than.

Description of drawings

Accompanying drawing is a general structure schematic diagram of the present utility model.

Among the figure:

1. fixed mounting 2. housings 3. operating circuit electrode A 4. operating circuit electrode B

5. fixed contact A 6. fixed contact B 7. detent mechanisms 8. moving contacts

9. motion control system 10. metallic seal covers 11. couple axles 12. compress springs

13. solenoid 14. centre bores 15. compression spring spacing holes 16. are moving unshakable in one's determination

17. contact working chamber 18. dividing plates

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing and exemplary embodiments.

In the accompanying drawings, high power DC contactor main body of the present utility model by the detent mechanism 7 of the housing 2 of band fixed mounting 1, the fixed contact A5 that links to each other with B4 with operating circuit electrode A 3 and B6 and concrete carry out with fixed contact A5 and B6 between the closure motion control system 9 that is switched on or switched off the moving contact 8 of circuit function constitute, be characterised in that: be close to increase on described housing 2 inner surfaces and be provided with the high duty metal seal closure 10 that is filled with high-purity nitrogen in the chamber; The motion control system 8 of described moving contact 8 be fixedly installed on by an end couple axle 11, suit on the center of moving contact 8 be fixedly installed on compression spring 12 and on another close end of couple axle 11 be movably arranged in the centre bore 14 of solenoid 13 and be fixedly installed on another end of couple axle 11, moving unshakable in one's determination 16 the constituting of interior band compression spring spacing hole 15.

Under confined state, one end of described compression spring 12 is stretched in the spacing hole of putting on described moving unshakable in one's determination 16 15, the other end is spacing by the dividing plate 18 that is arranged on 17 of solenoid 13 and contact working chambers, suit is arranged on the couple axle 11, during work, described moving contact 8 is done displacement up and down in company with the flowed through senses of current and the size control of solenoid 13 of couple axle 11 and moving unshakable in one's determination 16, realize carrying out and contact closed with B6 with fixed contact A5, energized or be pulled away from fixed contact A5 and B6, open circuit, the action of cutting off the electricity supply, be arranged on the ends that couple axle 11 is positioned at solenoid 13 close moving iron cores 16 owing to will compress spring 12, compression spring 12 pressurizeds when on moving contact 8 is controlled, moving, the savings energy, when moving contact 8 controlled when drop-down, compression spring 12 releases energy, and power-assisted is pulled back fast in moving contact 8.

Claims

1. high power DC contactor, by the detent mechanism (7) of the housing (2) of band fixed mounting (1), the fixed contact A (5) that links to each other with B (4) with operating circuit electrode A (3) and B (6) and specifically between execution and fixed contact A (5) and B (6) closure be switched on or switched off motion control system (9) formation of the moving contact (8) of circuit function, it is characterized in that:

A. described housing (2) inner surface tightens to be sticked and is equipped with the high duty metal seal closure (10) that is filled with high-purity nitrogen in the chamber;

The motion control system (8) of b. described moving contact (8) be fixedly installed on by an end couple axle (11), suit on the center of moving contact (8) be fixedly installed on compression spring (12) and on another close end of couple axle (11) be movably arranged in the centre bore (14) of solenoid (13) and be fixedly installed on another end of couple axle (11), the moving iron core (16) of interior band compression spring spacing hole (15) constitutes;

One end of c. described compression spring (12) is stretched in the spacing hole of putting on described moving iron core (16) (15), and the other end is spacing by the dividing plate (18) that is arranged between solenoid (13) and contact working chamber (17), and suit is arranged on the couple axle (11).