CN2166549Y

CN2166549Y - Double-protecting essential safety power source apparatus

Info

Publication number: CN2166549Y
Application number: CN 93227753
Authority: CN
Inventors: 郭晨光
Original assignee: SHENYANG ELECTRIC APPLIANCE INST
Current assignee: SHENYANG ELECTRIC APPLIANCE INST
Priority date: 1993-03-31
Filing date: 1993-03-31
Publication date: 1994-05-25
Anticipated expiration: 2003-03-31

Abstract

The utility model relates to an intrinsically safe power supply. The utility model is firstly connected with a power transformer and secondly connected with a full-wave rectification circuit, a double current stabilizing protective circuit, a double voltage stabilizing protective circuit and a short-circuit protective circuit, and once an output end is shorted or the double current stabilizing protective circuit and the double voltage stabilizing protective circuit generate failures, the utility model can cut off the power supply to perform the function of protection. The utility model has the advantages of simple structure, safe performance, etc.

Description

Double-protecting essential safety power source apparatus

It is the intrinsically safe power supply device of anti-riot means with inhibition and weakened points burning things which may cause a fire disaster that the utility model relates to a kind of.

In petrochemical industry, under the coal mine, wait in the occasion of explosive combustible gas mixture, electric spark, electric arc are the main incendiary sources that causes the combustible gas mixture explosive combustion.Therefore the explosion-proof problem of electric equipment is occupied crucial status in safety in production, up to now, the most extensive electrical apparatus for explosive atmospheres that adopts, except being the flameproof electrical apparatus of explosion-proof means with the isolating points burning things which may cause a fire disaster, be the intrinsicallysafe electrical apparatus of explosion-proof means with inhibition and weakened points burning things which may cause a fire disaster exactly.

In recent years, along with electronic technology, automatic control, development of computer.In the occasion that has the imflammable gas mixture to exist; various electrical controls, signals collecting, data communication and various measuring instrument protective device use intrinsicallysafe electrical apparatus day by day widely; but it is low that these devices exist coefficient of safety, defectives such as poor reliability.

The utility model purpose provides a kind of placing in the place of safety, can protect the GENERAL TYPE power supply associate device of the intrinsically safe circuit power devices in placing non-place of safety by dual limit.Thereby constitute the general intrinsic safety holotype electric equipment of holding concurrently.

The utility model is made up of shell body and installation protective circuit within it thereof; the panel of shell body is equipped with voltmeter; ammeter and button; power supply inserts full-wave rectifying circuit through power transformer; the full-wave rectifying circuit output is connected to ∏ type filter circuit; the output of filter circuit inserts dual current stabilization protective circuit and dual protective circuit of voltage regulation; the output of dual protective circuit of voltage regulation is connected to photoelectrical coupler; photoelectric coupler output end links to each other with output short circuit protection circuit; in output loop, be connected to voltmeter and ammeter, be provided with mains switch operating state display circuit in the power transformer secondary loop.

It is complete to the utlity model has protection, and circuit structure is simple, the use electric component is few, and security performance is reliable, has the scope of application widely.

Accompanying drawing 1 is the utility model circuit theory diagrams.

Accompanying drawing 2 is the utility model housing face-plate schematic diagram.

Accompanying drawing 3 is overlooked partial sectional view for the utility model shell.

Below in conjunction with accompanying drawing the utility model is further described; electrical principle of the present utility model provides in Fig. 1; its explosion-proof principle; take dual current stabilization by the electric parameter of restricting circuits exactly; dual voltage-stabilizing protection and short-circuit protection measure; weaken thermal effect and the spark that electric current was produced, the purpose of the discharge capacity of electric arc to reach.Make circuit supply no matter under normal running or malfunction, the spark of generation and thermal effect can not be lighted the imflammable gas mixture.

In electrical schematic diagram, through full-wave rectifying circuit 5, ∏ type filter circuit 6, through dual current stabilization, dual voltage stabilizing and short-circuit protection.At essential safety end output rated voltage, electric current.The essential safety performance of this power circuit output end is reached by dual current stabilization protective circuit 7, dual protective circuit of voltage regulation 8 and short-circuit protection circuit 10.T ₁, R ₂, R ₃, D ₂And T ₂, R ₄, R ₅, D ₃Form identical bistable stream protective circuit.Regulate R ₂, R ₄Numerical value, can change output current.U ₁, R ₇And U ₂, R ₈Form identical bistable and press protection, use different three-terminal voltage-stabilizing devices can change output voltage values.GD, T, D ₁, J, R ₆, R ₁₁Form output short circuit protection.Among the figure in the dotted line circuit part be current stabilization, surely take by force and protective element that short-circuit protection is formed, and the glue envelope is one, strengthened electric insulation, prevents electric leakage and puncture between intrinsically safe circuit and the non-intrinsically safe circuit.Fastening element prevents that short circuit and artificial folding are moving.Thereby further reach explosion-proof purpose.

Operation principle of the present utility model is achieved in that the utility model when normal operating conditions, presses panel button 3(Q ₁); at this moment power supply is connected with rectifying and wave-filtering and protective circuit behind power transformer 4; photoelectrical coupler 9 is in running order; its output inserts the base stage of the transistor T of short-circuit protection circuit; the relay that inserts its collector electrode has electricity and adhesive; the relay contact that inserts the mains switch operating state display circuit 11 in the power transformer secondary loop inserts the position that mains switch " is opened "; luminous tube indicates out; if output short circuit or the protection of dual current stabilization and dual protective circuit of voltage regulation lost efficacy; photoelectrical coupler is exported no-voltage; transistor T ends; relay J does not have; the relay tip that inserts mains switch operating state display circuit recovers the position of " pass "; luminous tube indicates the pass, has played the safeguard protection effect.In output circuit, be connected to voltmeter 1 and ammeter 2.

Claims

1; duplicate protection essential safety supply unit; form by shell body and installation protective circuit within it thereof; the panel that it is characterized in that shell body is equipped with voltmeter 1; ammeter 2 and button 3; power supply inserts full-wave rectifying circuit 5 through power transformer 4; the full-wave rectifying circuit output is connected to П type filter circuit 6; the output of filter circuit inserts dual current stabilization protective circuit 7 and dual protective circuit of voltage regulation 8; the output of dual voltage protection circuit is connected to photoelectrical coupler 9; photoelectric coupler output end links to each other with output short circuit protection circuit 10; in output loop, be connected to voltmeter and ammeter, be provided with mains switch operating state display circuit 11 in the electrofiltration transformer secondary output loop.