CN2076643U

CN2076643U - Ion flame sensing type auto-protector for igniting and putting out fire

Info

Publication number: CN2076643U
Application number: CN 90220893
Authority: CN
Inventors: 谭维文
Original assignee: Guangdong Petroleum Gas Appliance Development Co ltd
Current assignee: Guangdong Petroleum Gas Appliance Development Co ltd
Priority date: 1990-09-17
Filing date: 1990-09-17
Publication date: 1991-05-08

Abstract

The utility model relates to an ion flame sensing type automatic protection device for igniting and putting out fire, comprising a flame probe, a flame detection circuit, a timing control circuit, a pulse multiresonant oscillation circuit, an ignition circuit, an electromagnetic gas valve driving control circuit, an electromagnetic gas valve, a power supply circuit, a shell body, a panel, etc. The utility model utilizes the gases (comprising the combustible gas) of the glowing flame when in combusting, generates the ions with the definite electrical property under the function of the electric field with the definite electric voltage, and forms the electric current. The detection on the electric current is carried out, and the utility model discriminates whether the flame exists or not and carries out the control theory. According to the detection, the driving and the control on the circuits, the automatic ignition, monitoring and safe protection on various flames of industrial and civil combustion gas appliances are realized. The ion flame sensing type automatic protection device for igniting and putting out fire has high sensitivity, rapid reaction and safety.

Description

Ion flame sensing type auto-protector for igniting and putting out fire

The utility model relates to a kind of protective device, the automatic igniting, extinguishing protective device of particularly a kind of ion flame sensing type.

At present, most both at home and abroad domestic gas apparatus all adopt the sensor of thermocouple as flame monitoring, and as one of critical elements of safeguard protection, though it is simple and reliable, but also there are shortcomings such as the not high and thermal inertia of sensitivity is big, the more fuel gas of releasing sometimes; Adopt the photoelectric flame detector device complicated, have relatively high expectations and limited by environmental condition.

The purpose of this utility model provides short and fast, that cost the is low automatic igniting, extinguishing protective device of ion flame sensing type of a kind of simple in structure, highly sensitive, response time avoiding above-mentioned the deficiencies in the prior art part.

The purpose of this utility model can reach by following measure: the utility model comprises firing circuit, electromagnetic gas valve, power circuit, housing, panel, it is characterized in that: also have the flame probe, the flame detecting circuit, timing control circuit, the pulse multi-resonant oscillating circuit, the electromagnetic gas valve Drive and Control Circuit, the signal that the flame probe detects is delivered to timing control circuit behind the flame detecting circuit, the output of timing control circuit is delivered to firing circuit behind controlled pulse multi-resonant oscillating circuit, flame detecting circuit and timing control circuit all also have one tunnel output to deliver to the electromagnetic gas valve Drive and Control Circuit in addition, electromagnetic gas valve is delivered in the output of electromagnetic gas valve Drive and Control Circuit, the flame probe is contained in the flame top of Gas appliance, and electromagnetic gas valve is contained on the air inlet gas circuit of combustion gas.The flame probe connects not gate F1 input by the resistance R in the flame detecting circuit 1, the input of F1 also connects power supply by D1, the output one tunnel of F1 connects the positive pole of D3 in the timing control circuit, another road connects the base stage of T2 in the electromagnetic gas valve Drive and Control Circuit by D4, F3, R6, the negative pole of D3 connects the input of F5 in the pulse multi-resonant oscillating circuit by F2, D5, the output of F2 connects the input of F3 by R13, and the emitter-base bandgap grading of T2, T3 joins.Light emitting diode D7 is contained on the panel of combustion gas tool in the firing circuit, and igniting sparking electrode H is contained in by the burner side of combustion gas tool.

Whether the utility model utilizes in the flame when burning, and the gas under the certain voltage electric field action (comprising combustible gas) produces the certain electrical ion of band, and forms the closed-loop path, this is detected can differentiate flame and exist and transport control.

Fig. 1 is a functional-block diagram of the present utility model;

Fig. 2 is an electrical schematic diagram of the present utility model;

Fig. 3 is a contour structures schematic diagram of the present utility model.

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

With reference to Fig. 1, the utility model comprises compositions such as flame probe 1, flame detecting circuit 2, timing control circuit 3, pulse multi-resonant oscillating circuit 4, firing circuit 5, electromagnetic gas valve Drive and Control Circuit 6, electromagnetic gas valve 7, power circuit 8, housing 9, panel 10.

With reference to Fig. 2, flame detecting circuit 2 is by C1, C2, D1, R1, the also available NAND gate of not gate F1() etc. form.The G point is connected with flame probe 1.When no flame, D1 gives F1 input biasing level"1", and the F1 output is a level "0".This moment, the G point also was a level"1", this is because of no flame, though between G and body contact electrode one current potential is arranged, gas (comprising combustible gas) is basic unionization under the situation of normal temperature (even several Baidu high temperature), electric conductivity extreme difference, G and body contact electrode are the high event of resistance states; C1, R1, C2 form filter network, can eliminate all interference; (decided by design R2, C3, D7) this moment in the setting-up time of fetching boiling water after making K switch (for gas heater) connection power supply, because of F1 output level "0", so not gate F2 output level"1", the controlled pulse multivibrator that driving is made of F5, F6, R, R5, C5, D5, and by R8, T1, B1 power amplification in the firing circuit, boost, fill a little to C7 through the D6 rectification; Pulsed discharge loop (elementary) discharge that C7 then forms by R10, C6, D8, R11, DCR to B2, boosting once more makes enough voltage is arranged between ignitor (greater than 11 kilovolts) and energy generation pulse firing spark; Meanwhile, because of F2 output level"1", so F3 output level "0" makes the T2 conducting, electromagnetic gas valve 7 adhesives, the breakdown source of the gas cooperates the spark ignition of lighting a fire.As scheme accident and misfire, then cut off source of the gas automatically, and stop igniting; After any moment point pyrogene merit in setting-up time, then G and F1 import and all become level "0", F1 output becoming level"1", F2 output becoming level "0".Make firing circuit stop igniting at once, and make electromagnetic gas valve 7 keep the breakdown source of the gas, make utensil change normal operation over to by D4, F3, R6, T2.Flame-out as running into accident (anoxic or big wind) when operation, then because of the effect of C3, make F2 keep being output as level "0", F3 is output as level"1".T2 is ended, cut off source of the gas and no longer igniting at once.C4, R4(time constant are about 1～2 second among the figure), phase inverter F4, R7, T3 start electromagnetic gas valve to use.And D2 shortens recovery time, so that once more by switch water system K actuating appliance work once more at once.R9, D7 are that igniting and battery indication are used; Firing circuit (per second for several times) continuously produces pulse firing, and water system of every unlatching is all carried out in the same old way, just quits work in case point catches fire at once.1 sensitivity of flame probe is very high, and the response time can reach more than the Millisecond, also can work delicately up to 100 millimeters apart from main flame hole.

In the power circuit 8, E is external 3V battery; B3, T4, R14 form astatic multivibrator, and the feedback amplifier that oscillation energy, amplitude are formed by T5, R13, D11 is controlled.As long as E greater than (equaling) 1 volt (until 7～8 volts), fails and helps power supply stably to work with lower energy consumption.

With reference to Fig. 3, except that coupled switch K(water heater is a water system switch interlock), 6 elements such as flame probe 1, electromagnetic gas valve 7, light emitting diode D7, sparking electrode H and battery E, in the housing of making by ABS plastic 9 of all packing into hermetically; Nameplate 11 is housed on the panel 10; Its two-way lead-out wire 12,13 is contact thermoelectricity utmost point H and flame probe 1 respectively; Lug plate 14 connects electromagnetic gas valve 7; Lug plate 15,16 meets D7 and battery E respectively; Flame probe 1 is contained in flame top, ignitor H be contained in the burner side other (with the burner of body contact constitute sparking electrode to); 7 of electromagnetic gas valves are contained on the air inlet gas circuit of combustion gas, and they all are contained on the suitable separately position, combustion gas tool inside with coupled switch K.

The utility model has following advantage compared to existing technology:

Highly sensitive, be swift in response, safe and reliable, highly versatile, can be used for industry and the occasions such as automatic ignition, flame monitoring and safeguard protection of domestic gas apparatus.

Compact conformation, circuit is reasonable, volume is small and exquisite, with low cost.

Claims

1; the automatic igniting, extinguishing protective device of a kind of ion flame sensing type; comprise firing circuit 5; electromagnetic gas valve 7; power circuit 8; housing 9; panel 10; it is characterized in that: also have flame probe 1; flame detecting circuit 2; timing control circuit 3; pulse multi-resonant oscillating circuit 4; electromagnetic gas valve Drive and Control Circuit 6; the signal that flame probe 1 detects is delivered to timing control circuit 3 behind flame detecting circuit 2; the output of timing control circuit 3 is delivered to firing circuit 5 behind controlled pulse multi-resonant oscillating circuit 4; flame detecting circuit 2 and timing control circuit 3 all also have one tunnel output to deliver to electromagnetic gas valve Drive and Control Circuit 6 in addition; electromagnetic gas valve 7 is delivered in the output of electromagnetic gas valve Drive and Control Circuit 6; flame probe 1 is contained in the flame top of Gas appliance, and electromagnetic gas valve 7 is contained on the air inlet gas circuit of combustion gas.

2, protective device according to claim 1; it is characterized in that: flame probe 1 connects not gate F1 input by the resistance R in the flame detecting circuit 21; the input of F1 also connects power supply by D1; the output one tunnel of F1 connects the positive pole of D3 in the timing control circuit 3; another road connects the base stage of T2 in the electromagnetic gas valve Drive and Control Circuit 6 by D4, F3, R6; the negative pole of D3 connects the input of F5 in the pulse multi-resonant oscillating circuit 4 by F2, D5; the output of F2 connects the input of F3 by R13, and the emitter-base bandgap grading of T2, T3 joins.

3, protective device according to claim 1 is characterized in that: light emitting diode D7 is contained on the panel of combustion gas tool in the firing circuit 5, and igniting sparking electrode H is contained in by the burner side of combustion gas tool.