CN2046679U

CN2046679U - Overcurrent protecting contactor without arc

Info

Publication number: CN2046679U
Application number: CN 88213095
Authority: CN
Inventors: 张新耕; 尹金若
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-09-12
Filing date: 1988-09-12
Publication date: 1989-10-25

Abstract

The utility model relates to an overcurrent protecting contactor without arc. The utility model does not use the arc-extinguishing shamber and valuable metal materials to produce contacts. The utility model comprises an iron core, a coil, a double-break contact, a controllable silicon and a controlling circuit, an over-current protecting coil, a controlling and power-off releasing circuit board and a casing, etc. With the successive sequence of switch-on of the double-break contact and zero arc production when the controllable silicon and the controlling circuit switch on and off the contacts of a contactor, the over-current protecting coil switches on the controlling and power-off releasing circuit board, and thus the contactor can protect the controllable silicon and electric devices in the over-current condition. While operating, the power consumption of the contactor is tiny, less than the power consumption of an ordinary test pencil.

Description

Overcurrent protecting contactor without arc

The utility model is a kind of contactor, particularly a kind of overcurrent protection non-arc contactor.

Existing contactor, no matter be when operation contactor that need switch on of coil, coil does not need the contactor of switching on when still moving, they all will produce electric arc between its dynamic and static contact when switching on and off.This just makes contact produce the electric spark scaling loss, has to use precious metal material such as silver to do contact material for this reason, must use arc-extinguish chamber etc. to help arc extinguishing.

The utility model provides a kind of precious metals such as silver that do not use to do contact material, does not also use the new type contactor of arc-extinguish chamber.This overcurrent protection non-arc contactor mainly by static iron core 1, moving iron core 2, coil 3, fixed contact 4, moving contact 5, controllable silicon and control circuit 6, overcurrent protection coil 7, control and outage discharge circuit board 8, on cover 9, shell 10, base plate 11, etc. form.Contact system is the double-break contact system of tool, two fixed contacts 4 on its both sides are designed to high, the low form in one side on one side, like this when the contactor adhesive, in the process that moving contact 5 descends, at first connect, connect with the low one side of fixed contact 4 then with the high one side of fixed contact 4.And when contactor discharged, moving contact 5 disconnected with the low one side of fixed contact 4 earlier, just disconnect then with the high one side of fixed contact 4, and moving contact 5 with hang down between the fixed contact 4 in parallel on bidirectional triode thyristor and control circuit 6 thereof.The anode of bidirectional triode thyristor (first utmost point) connects in the middle of the moving contact 5; it is on one side low that negative electrode (second utmost point) connects fixed contact 4; the control utmost point links to each other with anode (first utmost point) by control circuit; maintain the conducting of bidirectional triode thyristor and deadline switching on and off among the time of the dynamic and static contact of two sides; play the effect that in the bidirectional triode thyristor circuit, switches on and off load current; not having electric arc when guaranteeing that contact switches on and off produces; the control of overcurrent induced voltage triggering and conducting and the outage of overcurrent protection coil discharge circuit board 8, thereby contactor coil 3 energisings are discharged.

Fig. 1 is contact system circuit theory diagrams of the present utility model.One group of contact system only draws among the figure.During the contactor adhesive, higher one side of its moving contact 5 and fixed contact 4 is at first connected, connect the control circuit 6 of controllable silicon SCR by being connected on moving contact 5 middle lines like this, the controllable silicon SCR conducting, further adhesive along with contactor, moving contact 5 and fixed contact 4 lower one side are connected at last, have so just finished whole energising course of action.

When contactor discharges, its moving contact 5 and fixed contact 4 is low at first to be disconnected on one side, makes the controllable silicon SCR conducting by control circuit thus and ends, then along with the further release of contactor, moving contact 5 and fixed contact 4 higher one side also disconnect, and have so just finished whole outage course of action.

Fig. 2 is the schematic diagram of the control circuit 6 of the utility model controllable silicon SCR.A, B two contacts are respectively a, b 2 points among Fig. 1, respectively the anode of map interlinking 1 controllable silicon SCR and the control utmost point.Circuit 6 is by diode D1, D2, capacitor C1, C2 and resistance R 1, compositions such as R2, R3.When moving contact 5 and fixed contact 4 higher one side were connected, the control utmost point that controllable silicon SCR is connected in the loop that the loop that power supply is formed by diode D1, capacitor C1 and resistance R 3 or diode D2, capacitor C2 and resistance R 3 are formed made its conducting.Otherwise, when moving contact 5 and fixed contact 4 is low when disconnecting on one side, the control utmost point that controllable silicon SCR is connected in the loop that the loop that power supply also can be formed by diode D1, capacitor C1 and resistance R 3 or diode D2, capacitor C2 and resistance R 3 are formed makes its conducting, simultaneously capacitor C1, C2 are charged, and controllable silicon SCR is ended.Suitably the size of the capacity of selection capacitor C1, C2 and resistance R 1, R2, R3 just can make no electric arc generation between the tentaculum contact.

Fig. 3 is the utility model direct dynamic structure schematic diagram.Contactor top does not have arc-extinguish chamber, and cover 9 can adopt with contactor shell identical materials (as bakelite etc.) and make on it.Close 5 at the movable contact of contact system and overcurrent protection coil 7 is set with the higher one side of fixed contact 4.Each all is made of overcurrent protection coil 7 primary and secondary two coils, and the elementary number of turns is few, and big electric current slightly can be passed through in the line footpath, and the multi-thread footpath of number of secondary turns carefully can produce high voltage.Primary coil is connected among the electric power loop, secondary control and the outage release circuit board 8 then linked.If situations such as load short circuits take place after contactor attracting process or adhesive; the electric current of the primary coil that flows through overcurrent protection coil 7 is increased greatly; the secondary coil induced voltage makes contactor control and outage discharge circuit board 8 action conductings; contactor will discharge immediately; deenergization plays overcurrent protection.

The static iron core 1 of contactor and moving iron core 2 are without the silicon steel sheet manufacturing.Static iron core 1 usefulness is made through the ordinary steel iron of quench hot, and moving iron core 2 without quench hot just.Its control and outage discharge circuit board 8 and are contained in the shell 10 of contactor bottom.

The course of work of the non-arc contactor of the utility model overcurrent protection once is described: when contactor not during adhesive below in conjunction with Fig. 1, Fig. 2, Fig. 3; its moving contact 5 and fixed contact 4 are disconnected, power supply and disconnect and do not have any state that is electrically connected with being in machinery between the electric loading.When the contactor adhesive, its moving contact 5 descends, at first connect with the higher one side of fixed contact 4, at this moment because the lower one side access failure of moving contact 5 and fixed contact 4, so there is not electric current in the circuit, therefore moving contact 5 and fixed contact 4 higher one side are connected, power supply will make the controllable silicon SCR conducting by the control circuit of it and controllable silicon SCR, load just can get electric operation, further decline along with moving contact 5, moving contact 5 and fixed contact 4 lower one side are connected, but because controllable silicon conducting at this moment, when connecting also do not have an electric arc generation so moving contact 5 and fixed contact 4 are low on one side.The control utmost point of controllable silicon SCR is a voltage out of hand after moving contact 5 and the low connection on one side of fixed contact 4, and controllable silicon SCR will be ended, and power supply will flow to load by fixed contact 4 and moving contact 5.

When contactor discharges, moving contact 5 rises, it and the low one side of fixed contact 4 at first disconnect, its disconnection can make controllable silicon SCR conducting immediately, electric current can be transferred in the controllable silicon SCR loop rapidly, but because the effect of capacitor C 1, C2 in the control loop, controllable silicon SCR can be ended after conducting at once immediately.Along with the further rising of moving contact 5, moving contact 5 and fixed contact 4 higher one side disconnect, but at this moment because controllable silicon disconnects no current thereby also do not have electric arc and produce in the loop.

The utility model contactor is no any electric linking between power supply after the release and load, can overcome between the rear power supply of general complementary switch disconnection and the load and still have the electric shortcoming that links, and the whole contactor minimal power consumption that is in operation is also littler than the power consumption of common voltage test pencil.

Claims

1; a kind of contactor; particularly a kind of overcurrent protection non-arc contactor; mainly by static iron core 1; moving iron core 2; coil 3; fixed contact 4; moving contact 5; controllable silicon and control circuit 6; overcurrent protection coil 7; control and outage discharge circuit board 8; last cover 9; shell 10; base plate 11 compositions such as grade; it is characterized in that: static iron core 1 usefulness is made through the ordinary steel iron of quench hot; moving iron core 2 without quench hot just; last cover 9 can be used and shell 10 same material manufacturings; the contact system of contactor is for having double break system's battle; two fixed contacts, 4 height on the both sides of one pair of contact system are different; high on one side; low on one side; fixed contact 4 high one side are connected earlier and are connected behind low one side in the time of can guaranteeing coil 3 energising adhesives; low one side disconnects earlier and disconnects behind high one side during release; on contact system upper static contact 4 higher one side overcurrent protection coil 7 is installed; controllable silicon and control circuit 6 are installed at fixed contact 4 on one side than low, control and outage release circuit board 8 are housed in the contactor lower case 10.

2, overcurrent protection non-arc contactor as claimed in claim 1 is characterized in that: overcurrent protection coil 7 is made of primary and secondary two coils, and the primary coil number of turns can be passed through big electric current less, and the secondary coil number of turns is many can to produce high voltage.