CN2929518Y

CN2929518Y - Gas range with automatic igniting function after accidently flame-out

Info

Publication number: CN2929518Y
Application number: CN 200620105962
Authority: CN
Inventors: 茅忠群
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2006-07-21
Filing date: 2006-07-21
Publication date: 2007-08-01
Anticipated expiration: 2016-07-21

Abstract

A gas kitchen range with the function of self re-ignition in case of an accidental flameout comprises a plug valve typed ignition switch, a first switch closing and conducting normally on driving (K1) when a plug valve typed ignition switch is pressed, an igniter, a flame detection circuit and a controlling circuit controlled by the first switch (K1), wherein the outlet portion of the flame detection circuit is connected with a first inlet portion of the controlling circuit, characterized in that the gas kitchen range also comprises a second switch (K2) used to percept if a plug valve typed ignition switch is rotated and a controllable third switch (K3) installed in parallel with the first switch (K1), the second switch (K2) is connected with the second inlet portion of the controlling circuit, and the controlling portion of the third switch (K3) is connected with the outlet portion of the controlling circuit. The utility model adds the second switch (K2) to percept if a plug valve typed ignition switch is in a rotated condition, meanwhile the flame detection circuit is equipped to percept if the flame is out, and finally the self re-ignition is realized by the third switch (K3), which not only judges accurately but is also designed simply and reliably.

Description

A kind of have behind the accident extinguishing automatically a gas-cooker of ignition function again

Technical field

The utility model relates to a kind of gas-cooker, and particularly a kind of have behind the accident extinguishing automatically a gas-cooker of ignition function again.

Background technology

Existing gas-cooker possesses the accident extinguishing automatic safety device mostly; principal mode has three kinds: heat-sensitive type safety guard, thermojunction type safety guard and ion induction type safety guard; wherein with the most use is the thermojunction type safety system, and whether this system utilizes the different different manifestations of metal when temperature is responded to of two kinds of thermal coefficient of expansions of thermocouple to come perception flame to extinguish and close gas-cooker.Though this system can be controlled at about 40 seconds cutting off the source of the gas time, but still exist gas leakage hidden danger, for example, when using this type of gas-cooker Baoshang, owing to firepower is crossed prosperous meeting and caused liquid to overflow stamping out the flames, but most user often can not notice this point, thinks and has closed gas-cooker, yet gas is in outwards discharging unawares, and danger obviously just at one's side.Therefore; the automatic gas-cooker of ignition function again is devised thereupon after having accident extinguishing; as the patent No. is that the Chinese utility model patent " a kind of gas-cooker that has again ignition function " of ZL01253095.6 (notification number is CN2502142Y) is exactly an example; its firing circuit by with the K switch 1 of Range switch interlock; the reed relay normally closed switch K2 of first thermocouple control; power supply and pulse igniter series connection form; fire the magnetic valve that second thermocouple control that is used for blowout protection is set on the internal heat road the gas-cooker master, the sparking point of described pulse igniter is arranged on the height of anger kept burning day and night.Because each burner is equipped with two thermocouples in this design, so cost is higher, complex structure, and judge also not accurate enough.

The utility model content

Technical problem to be solved in the utility model be provide at above-mentioned prior art present situation a kind of simple in structure, need not to increase thermocouple and also can realize having behind the accident extinguishing automatically the gas-cooker of ignition function again.

The utility model solves the problems of the technologies described above the technical scheme that is adopted: this has behind the accident extinguishing automatically the gas-cooker of ignition function again, include: open type first switch (K1) of plug valve, closed conducting when the valve rod of plug valve presses down, the igniter that is subjected to described first switch (K1) control, flame detection circuit and be the control circuit of core devices with microprocessor (MCU), wherein the output of flame detection circuit links to each other with the first input end mouth of microprocessor (MCU), it is characterized in that also including:

Be used for the second switch (K2) whether the valve rod of perception plug valve be rotated;

Controllable type three switch (K3) in parallel with first switch (K1);

And described second switch (K2) links to each other with second input port of described microprocessor (MCU), and the control part of described the 3rd switch (K3) links to each other with the output port of described microprocessor (MCU).

Wherein first switch (K1), second switch (K2) can adopt various prior aries, as mechanical type microswitch, magnet controlled near switch (as tongue tube type, Hall element type), capacitive approach switch and optoelectronic switch etc.

Described flame detection circuit can adopt various prior aries, can adopt modal thermocouple (RD) simply is temperature element, the positive pole of thermocouple (RD) links to each other with power supply (Vcc), and negative pole links to each other through the first input end mouth of the 3rd resistance (R3) with microprocessor (MCU) as the output of flame detection circuit.

Described the 3rd switch (K3) can adopt controllable silicon, triode etc. to have the various components and parts of control end, but preferably can adopt relay switch, its coil is control part, one end of coil links to each other with power supply (Vcc), the other end links to each other with the colelctor electrode of a triode (Q1), the grounded emitter of triode (Q1), the base stage of triode (Q1) links to each other through the output port of resistance (R4) with microprocessor (MCU).

Compared with prior art, advantage of the present utility model is whether be in the state of outwarding winding by setting up second switch (K2) detection plug valve, whether extinguish by the flame detection circuit flame detection simultaneously, thereby for judging whether to provide reliable basis exactly for accident extinguishing, and finally realize automatically igniting again by the 3rd switch (K3), not only accuracy of judgement, and project organization is simple, reliable.

Description of drawings

Fig. 1 is the schematic block circuit diagram of the utility model embodiment.

Fig. 2 is the circuit theory diagrams of the utility model embodiment.

Fig. 3 is that plug valve, first K switch 1 of the utility model embodiment, the position of second switch K2 concern schematic diagram.

The specific embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

As Fig. 1～shown in Figure 3, be a kind of gas-cooker of ignition function that has behind the accident extinguishing automatically again, include: plug valve 1, the open type first microswitch K1 of closed conducting when the valve rod 11 of plug valve is pressed down (shown in Figure 2 2), be subjected to the igniter of described first microswitch K1 control, be used for the second microswitch the K2 whether valve rod 11 of perception plug valve 1 be rotated (be shown in Figure 2 3), the relay K 3 in parallel with the first microswitch K1, be the flame detection circuit of temperature element and be the control circuit of core devices with thermocouple RD with microprocessor MCU; Wherein microprocessor MCU specifically adopts HT46RS1, also can adopt other chips of the same type, as ESPIC30F2011 etc.;

Wherein the positive pole of thermocouple RD links to each other with power Vcc, negative pole links to each other with the first input end mouth pin 11 of microprocessor MCU through the 3rd resistance R 3 as the output of flame detection circuit, and is being connected to the 5th capacitor C 5 between the first input end mouth (pin 11) of MCU and ground;

The termination power Vcc of the second microswitch K2 wherein, the other end connects second input port (pin 4) of MCU after resistance R 1, R2, capacitor C 4 current limlitings and anti-tampering processing;

One end of wherein said relay K 3 coils links to each other with power Vcc; the other end links to each other with the colelctor electrode of a triode Q1; the grounded emitter of triode Q1; the base stage of triode Q1 links to each other through the output port of resistance R 4 with microprocessor MCU, and the coil two ends of relay K 3 also and be connected to protection diode D1.

Wherein power Vcc connects microprocessor MCU power end (pin 1,9) after inductance L 1, capacitor C 1, C2, C3 filtering, anti-tampering processing;

Wherein the both positive and negative polarity of igniter links to each other with the both positive and negative polarity of battery respectively, and the tip side of the first microswitch K1 and relay K 3 then all links to each other with the control end of igniter.

During operate as normal, when the valve rod of pushing and rotate plug valve with hand, the first microswitch K1 closure, the igniting of cut-in point firearm, simultaneously, the second microswitch K2 is also closed, openhanded opening, K1 disconnects, igniter stops igniting, but K2 still is in closed conducting state; At this moment, thermocouple RD is heated, its two ends will produce a thermo-electromotive force, and giving the first input end mouth (pin 11) of microprocessor MCU through resistance R 3, capacitor C 5 is the level signal of (Vcc-12mV) with size, makes microprocessor MCU draw the judgement of normal combustion state;

In case of flame-out, electric thermo-couple temperature reduces, the first input end mouth of MCU (pin 11) obtains size and is the level signal of Vcc, make microprocessor MCU draw the judgement of flameout state, at this moment, microprocessor MCU inquires about the signal of telecommunication of its second input port (pin 4), as is high level, and promptly K switch 2 still is in closed conducting state, also be that plug valve is in the state of outwarding winding, then be judged as accident extinguishing, this moment, microprocessor MCU promptly drove from its output port (pin 7) output high level, made triode Q1 saturation conduction, relay K 3 coils get, its normally opened contact closure, then igniter light a fire once more, microprocessor MCU after the several seconds again from its output port (pin 7) output low level, triode Q1 ends, relay K 3 coil losing electricities, its normally opened contact disconnects, and igniter stops igniting.

Claims

1, a kind of have behind the accident extinguishing automatically a gas-cooker of ignition function again, include: plug valve (1), open type first switch (K1), the igniter that is subjected to described first switch (K1) control, flame detection circuit and be the control circuit of core devices with microprocessor (MCU) in the closed conducting when pressing down of the valve rod (11) of plug valve, wherein the output of flame detection circuit links to each other with the first input end mouth of microprocessor (MCU), it is characterized in that also including:

Be used for the second switch (K2) whether the valve rod (11) of perception plug valve (1) be rotated;

Controllable type three switch (K3) in parallel with first switch (K1);

2, according to claim 1 have behind the accident extinguishing automatically a gas-cooker of ignition function again, it is characterized in that described first switch (K1) is a microswitch.

3, according to claim 1 have behind the accident extinguishing automatically a gas-cooker of ignition function again, it is characterized in that described second switch (K2) is a microswitch.

4, describedly has behind the accident extinguishing automatically a gas-cooker of ignition function again according to claim 1,2 or 3, it is characterized in that described flame detection circuit adopts thermocouple (RD) to be temperature element, the positive pole of thermocouple (RID) links to each other with power supply (Vcc), and negative pole links to each other through the first input end mouth of the 3rd resistance (R3) with microprocessor (MCU) as the output of flame detection circuit.

5, described the unexpected flame-out back gas-cooker of ignition function more automatically arranged according to claim 1,2 or 3, it is characterized in that described the 3rd switch (K3) is a relay switch, its coil is control part, one end of coil links to each other with power supply (Vcc), the other end links to each other with the colelctor electrode of a triode (Q1), the grounded emitter of triode (Q1), the base stage of triode (Q1) links to each other through the output port of the 4th resistance (R4) with microprocessor (MCU).