CN2179538Y - Gas cooking range safety device - Google Patents

Abstract

The utility model introduces a device which can automatically ignite fuel gas ranges, check, alarm, close the air source and start the exhaustion when the flame is out in time, providing an effective safety device with low cost for extensive gas burning users.

Description

Gas cooking range safety device

The utility model relates to a kind of fuel gas kitchen range lights a fire automatically, can in time detect when flame-out, reports to the police, starts air draft, close source of the gas, guarantees the device of using safely.

In daily life, especially in the modern society that coal gas, liquefied gas stove are more and more popularized, how using gas kitchen ranges safely will be an important problems.In the market; be that a kind of eyes are put fire gas combustion range automatically mostly; lack safety guard; if because end user's carelessness or use are accidentally; after thinking initial igniter by mistake; burning has been lighted in combustion gas; perhaps because extraneous special circumstances; as liquid spill; wind or air pressure deficiency cause flame-out and do not close source of the gas, when causing combustion gas excessive; this class gas-cooker just can't overcome; though there are some documents to introduce the gas leakage autoalarm now, utilize gas sensor to make sensor as patent 92201529.5, add that electronic circuit and automatic closed safe valve realize that combustible gas leakage reports to the police automatically and close source of the gas; but gas sensor is all very responsive to any gas; because of being easy to produce wrong report, safety valve structure is also complicated simultaneously, and price is also more expensive.

The purpose of this utility model be existing, extensively enter on the gas kitchen ranges of subscriber household, design a kind of protective device, this protective device has three functions: guarantee the success of once lighting a fire when people start the gas kitchen ranges ignition switch 1.; 2. when causing combustion gas to leak owing to the kitchen range auto extinguishing, the signal that can give the alarm fast starts automatically and takes off exhaust blower and close source of the gas; 3. utilize ordinary carbon steel to substitute electrical sheet to reduce the electromagnetism cost.

In order to reach above purpose, the utility model is achieved like this: design an auto-ignition circuit, this circuit is after kitchen range are opened, and source of the gas is connected, and produces a control signal simultaneously, make the work of auto-ignition circuit oscillator, and boost through high voltage package, high-field electrode and kitchen range are got angry and are produced electric discharge phenomena between the cover, light kitchen range, in case light, the control signal level is a low level, and the work of oscillator stop so just can guarantee once to light successfully, if after lighting successfully, kitchen range run into external cause specific, as when heating up water, water boils excessive, winds etc. cause flame-out, combustion gas is excessive, and the thermocouple sensor output that then is contained in gas-cooker flame place is similar to the signal of OV, and the preamplifier that connects after this signal is delivered to amplifies, its output also is " 0 ", the preamplifier signal is delivered to comparator, with the thresholding level ratio of setting, as＜0.35V, comparator is output as high level, otherwise is low level.Behind the delayed 15sec--20sec of this level, drive the magnetic valve action, closed electromagnetic valve, cut off source of the gas, reach security personnel's purpose, meanwhile the comparator high level also removes control timer, protects alert circuit and takes off exhaust blower, is perfectly safe to guarantee that the combustion gas tool uses.

The utility model is described in further detail below in conjunction with accompanying drawing:

Accompanying drawing 1 is the utility model frame principle figure.

Accompanying drawing 2 is the utility model electrical schematic diagrams.

Accompanying drawing 3 is the utility model electromagnetic valve structure schematic diagrames.

Accompanying drawing 4 is the utility model magnetic valve A--A ' cutaway views.

Accompanying drawing 5 is the utility model magnetic valve B--B ' cutaway views.

1,2 real device is by sensor 1 with reference to the accompanying drawings, preamplifier 2, comparator 3, delay circuit 4, driver 5, timer 6, take off row and start 7, warning circuit 8, firing circuit 9, magnetic valve 10 compositions such as grade, sensor 1 adopts thermocouple to make sensing element, whether utilize it to produce extremely low thermoelectrical potential (think OV signal) at ambient temperature, produce the 12--14mV thermoelectrical potential and distinguish combustion gas and lighted under the flame heat condition, sensor 1 is installed in burner and flame position contacting.Sensor 1 output signal is 12--14mV, (intensity when lighting), this signal is delivered to preamplifier 2 and is amplified, outputing to comparison circuit after the 12--14mV signal that its function is exported by thermocouple amplifies compares, so adopt large-signal purpose relatively, be that circuit working is reliable, in the utility model, preamplifier is by among the four high guaily unit U1 first group (2,3 inputs, 1 output) form, its signal is exported from right kitchen range eye sensor, and the output of left kitchen range eye sensor is delivered to by second group of (5,6 input among the four high guaily unit U3,7 outputs) form, comparison circuit 3 also has two, and one is right kitchen range comparison circuit, by second among the four high guaily unit integrated package U1, the 3rd group (5,6 inputs, 7 outputs), 9,10 inputs, 8 outputs) amplifier, AND circuit U2(12,13 inputs, 11 outputs), and corresponding RC element constitutes, left side kitchen range comparison circuit is by first among the four high guaily unit 1C U3, the 4th group (2,3 inputs, 4 outputs) and corresponding RC element constitute, when preamplifier is sent " 0 " V signal here, comparison circuit output (U2 4 or 11) be high level (＞4V); When sending signal greater than 0.35V here by preamplifier, comparator circuit output 0V signal (low level), delay circuit 4 is by R27(or R29) integrating circuit that constitutes with C1.In case the left kitchen range of kitchen range (or right kitchen range) is opened, circuit powers up work, pin 5 output low levels by U4, T8 ends, R29 then, the integrating circuit work that C1 constitutes, if 15--20 within second the 12 pin level of U1 do not arrive 3V, kitchen range are promptly lighted, and then 3 pin of U2 are output as low level, and the 5 pin level of U4 are uprised, the T8 conducting, the work of integrating circuit stop, the 12 pin level of U3 constitute discharge circuit by C1 R29 T8, immediately discharge, if the 13 pin electrical level rising of U1 are to 3V in 15sec--20sec, even higher, source of the gas is cut off in then driving circuit for electromagnetic valve 5 actions.Drive circuit 5 is made up of two parts: one. constitute the forward drive circuit by the 4th group in the amplifier 1C circuit U 1 (12,13 inputs, 14 outputs) amplifier and R7 T1 T2; Two. the reverse degaussing circuit that constitutes by R4 R5 T3.When the 12 pin level of U1 reached 3V, 14 pin of U1 were exported greater than the 3V level, T2 T1 conducting, and magnetic valve moves because of exciting current is arranged, and closes source of the gas.After source of the gas was closed, A held ground connection, T3 conducting, pass to reverse erasing current to magnetic valve, well-known, magnetic valve 10 is when work, because the exciting curent effect produces action with the soft iron core magnetization, in order to reduce magnetic after effect, often adopt senior electrical sheet, cost must improve like this, in order to reduce cost, this magnetic valve 10 has adopted degaussing circuit, can eliminate remanent magnetism rapidly, valve is worked flexibly and comfortably, and use common A3 steel or No. 45 steel to make material.Timing circuit 6 is made up of U4 and T6 T7 R24～elements such as 26 D10 D11 C10, when K switch is closed, 9 pin of U4 are output as low level, after arriving by W potentiometer setting-up time, 9 pin output becoming high level, after R27 C1 constitutes integrating circuit delay 15--20sec, magnetic valve starts, cut off source of the gas, close kitchen range, fume exhauster automatic starting circuit 7, this circuit is made up of elements such as U4 right half part and R32 T9 J D12, when kitchen range stop working, when gas leakage is arranged, the U45 pin is output as low level, the T9 conducting, relay J is started working, the W-V joint of exhaust blower 220V is taken off in connection, take off exhaust blower work, warning circuit 8 constitutes an audio frequency oscillator by the half of circuit in a U5 left side, when gas leakage being arranged with kitchen range are flame-out, T8 is output as high level, trigger the oscillator work of the U5 left side, be coupled to loudspeaker by C15, send alarm signal, auto-ignition circuit 9, the ghyristor circuit that is made of an oscillator and T10 B and B level the right half of circuit of U5 constitutes, after kitchen range are opened, 3 pin of U2 are high level, and 4 pin by D8 R22 is coupled to U5 make oscillator work, be coupled to level B time by T10 B, deliver to high-tension coil by C20, high-field electrode and kitchen range are got angry and are produced electric discharge phenomena between the cover, just light kitchen range, in case lighted, the 3 pin output of U2 becomes low level, the right half of work stop of U5, the automatic stop of lighting a fire, all components all are installed on the same printed circuit board, be contained in the can after debugging is normal, and be installed in flame kitchen range far away, magnetic valve 10 is by valve body 11, back valve gap 12, seal washer 13, back valve core 14, preceding valve gap 15, o shape circle 16, button-headed screw 17,19, packing ring 18, packing ring 20, front valve core 21, adjusting nut 22, handle 23, iron core 24, adjust packing ring 25, bobbin 26, coil cover 27, coil core 28 compositions such as grade, in case after magnetic valve is pressed, promptly extracted by the stopper slot on the front valve core in the magnetic valve, valve promptly is closed, the maximum characteristics of this magnetic valve are to replace senior electrical sheet with ordinary steel, so cost is low.

Accompanying drawing 2 is enforcement circuit of the present utility model, and it and magnetic valve are installed on the kitchen range, can reach the utility model purpose of design fully.

Claims (5)

1, a kind ofly close the gas kitchen ranges protective device that the magnetic valve of source of the gas is partly formed automatically, it is characterized in that by automatic detection, warning, control section and execution:

(1) makes sensor with thermocouple;

(2) auto-ignition circuit is arranged;

(3) there is an ordinary steel (as A3 steel or 45 steel) to replace senior electrical sheet to make the magnetic valve of material.

2,, it is characterized in that sensor is installed on kitchen range and the flame position contacting by claims 1 described gas kitchen ranges protective device.

3, by claims 1 described gas kitchen ranges protective device, it is characterized in that auto-ignition circuit is made of the ghyristor circuit of operational amplifier U5 and T10 transformer B and B level, after kitchen range were opened, 3 pin of U2 were high level, 4 pin that are coupled to U5 by D8 R22 make its vibration, be coupled to level B time by T10B, deliver to high-tension coil by C20, high-field electrode and kitchen range are got angry and are produced electric discharge phenomena between the cover, just light kitchen range, in case light the 3 pin output low levels of U2, the work of oscillator stop.

4,, it is characterized in that magnetic valve used 45 by claims 1 described gas kitchen ranges protective device ^#Behind steel or the A3 steel, driving circuit for electromagnetic valve is made up of two parts: one. and the 4th group of four high guaily unit U1,12,13 pin of U1 are imported, 14 output amplifiers and R7 T1 T2 constitute the forward drive circuit, and constitute reverse degaussing circuit with R4 R5 T3, as 12 pin level＞3V of U1, the 14 pin output 〉=3V of U1, T2 T1 conducting, magnetic valve moves because of exciting current is arranged, after air valve is closed, A holds ground connection, the T3 conducting passes to reverse erasing current to magnetic valve, reduces magnetic after effect.

5, by claims 1 described gas kitchen ranges protective device, it is characterized in that all circuit, comprise automatic igniting 9, preamplifier 2, comparison circuit 3, delay circuit 4, drive circuit 5, timing circuit 6, take off row and start 7, warning circuit 8 all is installed on the same printed circuit board (PCB), and adopts the IC circuit, be contained in then in the can, be installed on flame kitchen range far away.

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