CN2197739Y

CN2197739Y - Arcless contactor

Info

Publication number: CN2197739Y
Application number: CN 93222249
Authority: CN
Inventors: 朱锦秋
Original assignee: XIALIBA INDUSTRY Co HUIZHOU CITY
Current assignee: XIALIBA INDUSTRY Co HUIZHOU CITY
Priority date: 1993-08-27
Filing date: 1993-08-27
Publication date: 1995-05-17
Anticipated expiration: 2003-08-27

Abstract

The utility model relates to an arcless contactor, which is composed of a contactor, a silicon controlled rectifier and a control circuit. The arcless contactor is characterized in that the fixed plate of the auxiliary contact of the contactor is provided with a microswitch, a current-limiting resistor and the silicon controlled rectifier; the microswitch is arranged on the both sides of the slide groove of the fixed plate of the auxiliary contact; the side of the linking push rod of the auxiliary contact is used to push the microswitch before the arcless contactor conducts electricity and at the moment of switching off to switch on the silicon controlled rectifier circuit, which causes potential difference of the moment of the contact and the separation of the contact terminals is zero, and thereby, the zero potential on-off without arc is realized. The utility model does not need to be provided with an arc extinguishing cover and maintenance, and the utility model has the advantages of strong overload ability, high stabilization, high reliability, lower power consumption for working, etc.

Description

Arcless contactor

The utility model relates to a kind of no electric arc contactor.

The existing employing in the controllable silicon no electric arc contactor in parallel with main contact, the ghyristor circuit complexity, poor reliability is particularly aspect mechanical structure, can't adjust the time difference of the break-make and the main contact break-make of SCR control circuit, be difficult to guarantee not have the stability of arc control.

The utility model provides a kind of solution above-mentioned in-problem no electric arc contactor.It has prepared dapper sensitive switch, has found the ideal control relation, thereby it is simple to propose a kind of circuit, compact conformation, and stable and reliable operation does not have the electric arc contactor.

A kind of no electric arc contactor is by contactor, and controllable silicon and control circuit thereof are formed, and it is characterized in that sensitive switch being housed, current-limiting resistance and controllable silicon on the fixed head of both sides auxiliary contact on the contactor.Sensitive switch is contained in the both sides of sliding tray on the fixed head of auxiliary contact, before the main contact conduction, utilize the interlock push rod side of auxiliary contact to promote sensitive switch with the moment of cutting off the power supply, connect ghyristor circuit, making the contact between the contact and the potential difference of the time of releasing is zero.Reach the zero potential break-make and do not have arc.

A kind of no electric arc contactor is characterized in that on the fixed head of described auxiliary contact 4 fixedly fixed legs of sensitive switch being arranged, and highly is 2 to 4mm, and diameter is 1.5 to 2mm.

A kind of no electric arc contactor is characterized in that having on the fixed head of described auxiliary contact 2 to 4 fixedly screws of using of controllable silicon, and diameter is 3 to 5mm.

Accompanying drawing drawing of the present utility model is described as follows:

Fig. 1 is the circuitry phase figure in this contactor circuit principle.

Fig. 2 is a cross sectional side view of the present utility model.

Fig. 3 is the end view of contactor auxiliary contact fixed head.

In the accompanying drawings, (1) is dust cover, and (2) are the movable contact bridges, (3) be fixed contact, (4) are that interlock bakelite, (5) are iron core, and (6) are static iron cores, (7) be shell, (8) be bottom, (9) are the fixed heads of auxiliary contact, and (10) are the interlock push rods, (11) be sensitive switch, (12) be controllable silicon, (13) are the interlock push rod sliding trays on the fixed head of auxiliary contact, and (14) are current-limiting resistances.

Be described in further detail below in conjunction with example:

What this example adopted is contactor, controllable silicon and the control circuit thereof of CJ20-40 type.On the fixed head of the auxiliary contact of contactor both sides, controllable silicon and control circuit thereof have been adorned.Microswitch is in the both sides near the push rod sliding tray of auxiliary contact.Each sensitive switch highly is respectively that 2.5mm, diameter are that the fixed leg of 2mm is fixed on the fixed head by two.Each controllable silicon by 1 diameter screw that is 3mm on fixed head.Before the main contact conducting and disconnect the push rod of auxiliary contact that moment utilizes moving iron core interlock at the stroke of its sliding tray, sensitive switch is touched in the side, connects ghyristor circuit, guarantees the stability that no arc is controlled.

After the contactor energising, contactor begins adhesive, moving iron core (5) drives interlock electric bakelite (6) and slides downwards, the push rod of auxiliary contact is also with pushing away at present, when interlock electric bakelite (6) leaves original position 1-1.5 millimeter place, Yun Hang push rod down, its side has been touched sensitive switch K(11 lightly), connect the SCR control circuit and make controllable silicon SCR (12) conducting.When the interlock electric bakelite continues down to move, drive movable contact bridge (2) and join with fixed contact (3).In dynamic and static contact contact process, because of the controllable silicon conducting is arranged, flow to the current direction controllable silicon of load, and the potential difference between the CJ of contact is approximately zero, and electric arc does not take place.Otherwise when contactor disconnected, the movable contact bridge disconnected earlier, and sensitive switch K still connects, make the rapid conducting of controllable silicon, load current forward to can empty silicon on.Though the movable contact bridge disconnects, controllable silicon is conducting, thereby the potential difference between the contact also is approximately zero, in like manner also is not enough to take place electric arc.So, guarantee that potential difference between the contact is zero contact and separate, and just can electric arc not occur yet.When moving iron core was back to original position, sensitive switch K was disconnected, and triggerless electric current, controllable silicon are when the alternating current zero passage and end, and the load dead electricity quits work.

Because of flowing to the silicon controlled electric current is of short duration, so overload capacity is strong.Because of no electric arc, reduced the power consumption of arcing on the one hand, also reduced mechanical heat simultaneously and done harm to, grow, fall low in power consumption so have the life-span.Because of no electric arc, the desirable arc-extinguish chamber that disappears need not often be removed the work of contact filth.

Claims

1, a kind of no electric arc contactor, form by contactor, controllable silicon and control circuit thereof, it is characterized in that on the both sides auxiliary contact fixed head sensitive switch, current-limiting resistance and controllable silicon being housed on the contactor, sensitive switch is contained in the both sides of sliding tray on the fixed head of auxiliary contact, before main contact conduction and disconnect moment and utilize the interlock push rod side promotion sensitive switch of auxiliary contact, connect ghyristor circuit, making the contact between the contact and the potential difference of the time of releasing is zero.

2, no electric arc contactor according to claim 1 is characterized in that 4 fixedly fixed legs of sensitive switch are arranged on the described auxiliary contact fixed head, highly is 2 to 4 millimeters, and diameter is 1.5 to 2.5 millimeters.

3, no electric arc contactor according to claim 1 is characterized in that having on the described auxiliary contact fixed head 2 to 4 fixedly screws of using of controllable silicon, and diameter is the 3-5 millimeter.