CN2163469Y

CN2163469Y - Safety fire-proof alarming switch for electrical carpet

Info

Publication number: CN2163469Y
Application number: CN 93230731
Authority: CN
Inventors: 王春民
Original assignee: RUSHAN INDUSTRIAL SEWING MACHINE PLANT SHANDONG PROV
Current assignee: RUSHAN INDUSTRIAL SEWING MACHINE PLANT SHANDONG PROV
Priority date: 1993-04-13
Filing date: 1993-04-13
Publication date: 1994-04-27
Anticipated expiration: 2003-04-13

Abstract

The utility model relates to a safety fire-proof alarming switch for an electric blanket, and particularly relates to a safety device for the electric blanket. An outer shell of the utility model is provided with a high and low range switch, an indication lamp and a start button, and a circuit board orderly connected with a switch circuit, an indication lamp circuit, a rectification circuit, a control circuit and an alarm circuit are arranged in a shell body. The switch has the advantages of simple structure and safety; after a heating wire breaks, the utility model can give an alarm and automatically cut a power supply source to effectively protect the electric blanket and to prevent fire; meanwhile, the utility model is a new safety device which can effectively eliminate the symptoms of malaise bringing by using the electric blanket, because the utility model uses a direct-current power supply to work.

Description

Safety fire-proof alarming switch for electrical carpet

The utility model belongs to the electric blanket safety guard.

Along with the continuous improvement and the raising of material life, electric blanket has become warming article on China people bed in quite ace-high winter at present.In the use; influence owing to factors such as wearing out for a long time in folding, extrusion stretching, improper use and year; local broken string takes place in heating wire often; after energized, the collision sparking of broken string place easily causes the electric blanket burning; cause fire; cause tremendous loss to the people's lives and property, up to now, still find no electric blanket broken string sparking protective device.

The purpose of this utility model just is to provide a kind of new type of safe protection switch that integrates high and low shift temperature adjustment, luminous indication, break alarm, cuts off the power supply automatically, to improve the safety and reliability of electric blanket.

The utility model mainly is made up of shell, start button and control circuit three parts.Outer casing frontispiece is equipped with high and low shift bit switch, high and low shift indicator light and start button; The lead-out wire plug that the shell upper end has sheath to hold, the lower end is leaded to link to each other with the heating wire of electric blanket, control circuit is installed on the interior wiring board of housing, and the switching circuit, indicator light circuit, rectification circuit, control circuit and the warning circuit that connect successively are housed on the plate.Switching circuit is connected with high and low shift bit switch on being installed in shell; Indicator light circuit is composed in series by light-emitting diode and resistance, is connected on the switching circuit; Rectification circuit is made up of the diode series and parallel; Control circuit is made up of one-way SCR, heating wire and start button, electric capacity series and parallel, is connected on the rectification circuit, and start button is connected on the rectification circuit by contact piece; Warning circuit is made up of the corresponding series and parallel of triode, resistance, two-way trigger tube and piezoelectric ceramic piece, links to each other with control circuit.

When the high and low shift bit switch was closed, the switch movable contact spring was at the lower end neutral position, and line interruption is disconnected, upwards stir one grade during use, switch low temperature shelves are connected, and green luminotron is bright, and the indication power supply is low-grade to be connected, potsherd sends alarm sound simultaneously, upwards stir one grade again, temperature end is connected, and green luminotron extinguishes, red luminotron is bright, indication is high-grade connects, and potsherd still sends alarm sound, when switch is in above-mentioned two grades of optional positions, the sound is continuous, proof control circuit heating wire not to be connected, and clicks start button this moment, and alert sound stops, the proof heating wire begins heating, control circuit work.Behind the broken string of the heating wire in the work, control circuit quits work, and cuts off the electrothermal wire power loop, and simultaneously, the piezoelectric ceramic piece of warning circuit sends alarm sound, even press start button, alarm sound does not still stop.

The utility model volume is little, the indication of good looking appearance, high low temperature is clearly demarcated; circuit is simple, stable performance; has the heating wire break alarm; function such as cut off the electricity supply automatically; during simultaneously owing to the heating wire heating; adopt direct current; thereby can reduce the periodicity amplitude effect of alternating voltage effectively to tissue magnetic field; can improve use significantly not with influences such as the mouth parched and tongue scorched that electric blanket brought of this device, dysphorias; being fit to the supporting use of single, double domestic electric heating blanket, is a kind of novel safety guard.

Accompanying drawing 1 is electric blanket fireproof alarming switching circuit figure.

Accompanying drawing 2 is an electric blanket fireproof alarming on-off principle connection diagram.

Embodiment:

With ZH-2HQ electric blanket fireproof alarming switch is example, the contrast accompanying drawing, and the utility model will be further described.

The utility model mainly is made up of shell, start button, control circuit three parts.Shell is by the upper and lower covers be combined into, above top cover of faceplate, about two sides be distributed with high low temperature indicator light, the middle part is the high and low shift bit switch, and start button is equipped with in the side, and there is the warning hole in lower cover the place ahead, the upper end is the power supply lead wire plug, the lower end connects the heater strip of electric blanket by lead-in wire, and wiring board is housed in the enclosure, and the switching circuit, indicator light circuit, rectification circuit, control circuit and the warning circuit that connect successively are housed on the plate.Switching circuit is connected with high and low shift bit switch on being installed in shell; Indicator light circuit is by a green LED ₁With a Red LED1 LED ₂Be composed in series with resistance, be connected on the switching circuit; Rectification circuit is a bridge circuit, is made up of 4 diode series and parallels; Control circuit is by one-way SCR MCR100-8, heating wire, start button K ₁Form with the electric capacity series and parallel, be connected on the rectification circuit; Warning circuit is by triode, resistance, two-way trigger tube DB ₃With the corresponding series and parallel of piezoelectric ceramic piece HTD, link to each other with control circuit.

When switch was in closed condition, the switch movable contact spring was upwards stirred one grade when (seeing accompanying drawing 1) uses on position 3, and two contacts and switch 1 termination are logical, LED ₁Through resistance R ₄Current limliting forms the loop.After connecting circuit, because diode D ₁Unilateral conduction, the diode D of bridge rectification circuit ₃Conducting has been set up the half-wave pulsating dc voltage at circuit S point, simultaneously LED ₁Indication low temperature shelves state, luminous tube LED ₂With diode D ₁Polarity is not luminous relatively.When switch was upwards stirred one grade again, input voltage Ac entered full bridge rectifier, had set up the all-wave pulsating dc voltage at the S point, simultaneously, and LED ₂Through resistance R ₁Current limliting, it is luminous that power supply is formed the loop, indication all-wave state.LED ₁Because to diode (LED) ₂Polarity is not luminous on the contrary, all-wave that indicates circuit that such two indicator lights can be eye-catching respectively and half-wave high and low shift state.After circuit S point was set up voltage, voltage divided two-way, and one the tunnel through resistance R ₂Be added to triode T ₁E, the c utmost point and piezoelectric patches HTD, two-way trigger tube DB ₃Two ends, two-way trigger tube are during as voltage stabilizing, and its two ends voltage stabilizing value is about the 20--25 volt, when pulse voltage affacts DB ₃During with the HTD two ends, HTD deforms, and with the pulse frequency vibration, sends the continuous sound greater than 50 decibels.Another road voltage affacts controllable silicon MCR100-8 two ends by electric blanket heating wire R1: because of controllable silicon G utmost point triggerless voltage, and not conducting of controllable silicon, heating wire R1 does not heat, and presses start button K ₁, the S point voltage passes through resistance R ₂To capacitor C ₁Charging, when voltage reaches trigger electrode and opens the door voltage, the controllable silicon conducting, heating wire R1 begins heating, start button K ₁After unclamping, because C ₁Discharge and silicon controlled self-sustaining characteristic, conduction status is kept down always.After the controllable silicon conducting, anode becomes electronegative potential, triode T ₁Base potential is by diode D ₆, resistance R ₃Drop-down, T ₁Conducting, emitter voltage arrives zero, piezoelectric patches HTD two ends no-voltage nonoscillatory, the sound stops, and heating wire R1 has just entered the normal heating operating state like this.After the electric blanket heating wire broke, controllable silicon did not have the electric current of keeping and stops conducting, triode T ₁Because of the base suspension high potential ends, the piezoelectric patches both end voltage raises and vibrates, and produces alarm sound, and colliding once more because of the no current loop in heating wire broken end place, does not produce spark, so just played break alarm, prevents the effect of striking sparks.

Claims

1, a kind of electric blanket fire safety alarm switch, it comprises shell, indicator light and high and low shift bit switch, it is characterized in that:

A. indicator light circuit is become by 2 light-emitting diode series connection resistor group;

B. control circuit is made up of controllable silicon, electric capacity and start button;

C. warning circuit is composed in parallel by the piezoelectric ceramic piece two-way trigger tube;

D. switching circuit, indicator light circuit, rectification circuit, control circuit and warning circuit connect successively.

2, electric blanket fire safety alarm switch according to claim 1 is characterized in that switching circuit is connecting the high and low shift bit switch.

3, according to claim 1,2 described electric blanket fire safety alarm switches, it is characterized in that start button is connected on the control circuit.