CN2355422Y

CN2355422Y - Contactless explosionproof A.C. contactor

Info

Publication number: CN2355422Y
Application number: CN 98223841
Authority: CN
Inventors: 吴剑男
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-04-27
Filing date: 1998-04-27
Publication date: 1999-12-22
Anticipated expiration: 2008-04-27

Abstract

The utility model relates to a contactless explosion-proof AC contactor which is composed of a solid assembly block of a control circuit and a switch device body, wherein, the solid assembly block of a control circuit is composed of a relay, resistors, capacitors and a static iron block; the switch device body is a case which is composed of an outer casing, metal connectors, a movable iron block and mercury. The utility model has the advantages of no contact, explosion prevention, small size, simple work principle, convenient control, long service life and safety, which can be used in industrial production.

Description

Contactless explosion-proof A.C. contactor

The utility model relates to a kind of contactless explosion-proof A.C. contactor, particularly about the switching device of contactless explosion-proof A.C. contactor.

Existing A.C. contactor (CJ, CJ2B, CJ10, CJ20, CZO series) all adopts by electromagnet and connects structure with the disjunction contact, with regard to the CJ40A contactor about common 1 year useful life, have in addition some months.Its flashover distance＞15mm, noise is big, time of contact ≯ 200ms.Be 0.35 ± 0.05 among the COS, every A.C. contactor will consume copper cash 170g, silicon steel sheet 510g, and silver 1.5g, even in current low voltage, indivedual uses are unidirectional in the little electric current high voltage rectifier equipment.Reverse parallel connection formula controllable silicon is the contact A.C. contactor, also can be because of the circuits for triggering complexity, volume is big, price is expensive and influence large-scale popularization and use.Be that existing A.C. contactor is applicable to rated duty, and require the relative temperature of air to be not more than 85%, in non-hazardous medium, use.Contactless explosion-proof A.C. contactor has been developed into the target that people pursue for this reason.Document Chinese patent CN2081607U has introduced a kind of contactless explosion-proof contactor, it is to use three two-way thyratron transistors as switching device, to solve A.C. contactor contact, electric arc, price is expensive, useful life is short problem are arranged, but the inventor thinks that the document exists the A.C. contactor volume big, circuit is perishable, defectives such as control complexity.

The purpose of this utility model is that volume is big in the above-mentioned document, control is complicated, the perishable shortcoming of circuit in order to overcome, a kind of new contactless explosion-proof A.C. contactor is provided, it is little that this contactor has a volume, and operation principle is simple, control is convenient, the full reliable characteristics in life-span Chang'an.

The purpose of this utility model is to realize by following technical scheme: a kind of contactless contactor that makes things convenient for, constitute control circuit solid chunk by relay, resistance, electric capacity, quiet iron block, and quiet iron block is fixed on the bottom fixed board.With going out casing that shell, metal connection post, moving iron block, mercury forms as switching device, wherein form a cavity in the shell, the interior mercury that injects is placed moving iron block above the mercury, the metal connection post is fixed on and stretches in the cavity on the shell, when relay disconnects, the metal connection post does not contact with mercury, when relay is worked, by moving iron block setting-out silvering solution, the metal connection post is contacted with mercury, form the loop.

Shell is made by insulating material in the technique scheme, and its priority scheme is pottery or polytetrafluoroethylmaterial material.Shell can be fixed on the solid chunk or with the solid chunk be an integral body.The quantity priority scheme of its switching device is three groups.The trigger control circuit solid chunk that relay in the utility model, resistance, electric capacity etc. constitute is identical with existing technology, bears the zero cross fired control task.The startup of trigger control circuit is that common start button carries out, the installation of this contactor, wiring, practical identical with existing A.C. contactor.

The utility model adopts the casing of shell, metal connection post, moving iron block, mercury composition as switching device.Because adopting liquid mercury is electric conductor, contacts in annular seal space with solid by liquid and finishes electrically conducting manner, makes it have contactless and explosion-proof performance.In addition, because operation principle of the present utility model is to realize by the law of buoyancy in the mechanics, when relay connection work, attract moving iron block by quiet iron block, make electric field magnetic force and moving iron block weight sum greater than moving iron block buoyancy, cause moving iron block downward, the mercury liquid level rising contacts with the metal connection post and forms the loop, thereby start the electrical equipment operate as normal, simultaneously the contactor self-locking.When relay disconnected, electric field magnetic force disappeared, and moving iron block weight causes moving iron block upwards less than buoyancy, and mercury liquid level decline disconnects with the metal connection post and forms the loop, thereby cuts off the electrical work state.Therefore, the utlity model has the characteristics that volume is little, operation principle simple, control is convenient, the life-span is long, safe and reliable, in addition, because in the utility model, liquid and solid metal contact gear ratio are softer, can avoid sharp pounding, solid and liquid contact surface are long-pending big, can improve the capacity of A.C. contactor, have avoided use noble metal silver simultaneously, can reduce cost, obtain gratifying effect.

The novel concrete structure of this use is provided by the following drawings:

Fig. 1 is the schematic diagram of contactless explosion-proof A.C. contactor.

Fig. 2 is the electrical schematic diagram of contactless explosion-proof A.C. contactor.

1 is electric conductor mercury among Fig. 1, and 2 are wiring fixed housing lid, and 3 is electric power incoming line metal connection post, and 4 are moving iron block, and 5 is power outlet metal connection post, and 6 is shell, and 7 is coil, and 8 is quiet iron block, and 9 is fixed head, and 10 is the coil power binding post.

Among Fig. 2 3～and be the three-phase alternating-current supply power supply, R ₁, R ₂, R ₃Be main fuse, TA is normally closed button, and QA is for often driving button, and C is a contactor coil, and C is that contactor is often made war, and D is load.

Fig. 1, among Fig. 2, press QA, coil C is generated an electromagnetic field, attract moving iron block 4, the liquid level of mercury electric conductor 1 is risen by quiet iron block 8, thereby mercury electric conductor 1 is contacted with electric power incoming line metal connection post 3, contactor turnover power line forms the loop by electric conductor mercury 1, electrical equipment D work, contactor self-locking simultaneously.Press TA, coil C disconnects, and at this moment electromagnetic field gravitation is zero, and moving iron block 4 rises, and mercury electric conductor 1 liquid level descends, and mercury electric conductor 1 disconnects with electric power incoming line metal connection post 3, and the loop is obstructed, and electrical equipment D quits work.

Claims

1. contactless explosion-proof A.C. contactor, by relay, resistance, electric capacity, quiet iron block constitutes control circuit solid chunk, quiet iron block is fixed on the bottom fixed board, it is characterized in that using by shell, the metal connection post, moving iron block, the casing that mercury is formed is as switching device, wherein form a cavity in the shell, the interior mercury that injects, place moving iron block above the mercury, the metal connection post is fixed on and stretches on the shell in the cavity, and when relay disconnected, the metal connection post did not contact with mercury with moving iron block, when relay is worked, by moving iron block setting-out silvering solution, the metal connection post is contacted with mercury, form the loop.

2. above-mentioned according to claim 1, contactless explosion-proof A.C. contactor is characterized in that shell made by insulating material.

3. according to claim 2, contactless explosion-proof A.C. contactor is characterized in that insulating material is pottery or polytetrafluoroethylene.

4. according to claim 1, contactless explosion-proof A.C. contactor, it is characterized in that shell be fixed on the solid chunk or with the solid chunk be an integral body.

5. according to claim 1, contactless explosion-proof A.C. contactor is characterized in that switching device is three groups.