CN2413198Y

CN2413198Y - Electronic ignition safety device for gas stove and range

Info

Publication number: CN2413198Y
Application number: CN 99247914
Authority: CN
Inventors: 陆占平
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-11-24
Filing date: 1999-11-24
Publication date: 2001-01-03
Anticipated expiration: 2009-11-24

Abstract

The utility model relates to a new-type electronic ignition safety protective device for a gas stove, which is suitable for not only gas stoves but also other gas appliances. The utility model comprises metal needles, and each metal needle which is installed near a stove burner has double action of flame detection and discharge ignition. The input terminal of each of flame detection circuits is connected by a conducting wire and is simultaneously connected in parallel with the output terminal of a high-voltage ignition circuit. The output of each of the flame detection circuits is connected with the high-voltage ignition circuit through a gated circuit and is simultaneously connected in parallel with an alarm circuit. The output of the gated circuit is connected with an automatic valve closing circuit through a time delay circuit, and the output of the automatic valve closing circuit drives a valve closing executing mechanism. The device can realize the functions of automatic electronic ignition, automatic reignition after excused flameout, and automatic closing operation of an air source valve after continuous unsuccessful reignition. The utility model also has the advantage of convenient and safe operation.

Description

Novel gas cooking stove electronic ignition safety guard

The utility model relates to Gas appliance, mainly refers to be applicable to the electronic ignition safety guard that gas stove is used.

Present electronic striking cooking stove; all adopt the piezoelectric ceramics sparking, generally do not establish safety guard, often cause the gas leakage accident when stopping working for some reason; existing safety guard; be to adopt temperature-sensitive or gas sensor to detect to realize, but temperature-sensitive element needs one section temperature fall time that reflection is just arranged, this does not reach the protection purpose; and gas sensor cost height; main is that with the passing of time sensitivity fall, and extremely the incompatibility kitchen environment is worked for a long time, poor reliability.

The goal of the invention of the utility model; be to overcome the defective of prior art; provide a kind of flame that utilizes to have the electric security protector device that bad electric conductivity principle constitutes; can realize the autoelectrinic igniting; flame-out for some reason igniting more automatically; when igniting is unsuccessful more continuously, then close the gas source valve function automatically, safe and reliable.

The embodiment of the utility model is, it comprises is fixed on the insulating support (29), its most advanced and sophisticated metal needle near burner (8), this metal needle has flame detecting and discharge igniting dual-use function concurrently, its terminal flame detection circuit input that is electrically connected is connected to the high-tension ignition circuit output end simultaneously; The flame detection circuit output connects the high-tension ignition circuit input end, while and circuit input end taking alarm; The flame detection circuit output also connects by delay circuit closes the gas source valve circuit automatically, and its output drives closes gas source valve executing agency.

(generally be double burner) when cooking stove is double burner, flame detection circuit (1), (2) output connect high-tension ignition, warning circuit again by the one-level gating circuit;

The utility model utilizes the bad electric conductivity of flame to survey having or not of flame, the principle novelty, and the circuit of employing is reliable and stable, realized that high-pressure electronic lights a fire automatically, reported to the police simultaneously, flame-out for some reason can the igniting more automatically in the use, can close source of the gas automatically when igniting is unsuccessful again, sensitive reliable.

The electrical configuration of the utility model is provided by following accompanying drawing:

Fig. 1, the utility model circuit theory diagrams

Fig. 2, the utility model electricity theory diagram

Fig. 3, the utility model cooking stove protective device metal needle is by the dress schematic diagram

Fig. 4, the electronic closing valve of the utility model mechanism structural map

Fig. 5, the utility model electromagnet, ratchet, connecting rod closing valve mechanism structural map

Describe the tectonic relationship of the utility model in detail below in conjunction with accompanying drawing.

Accompanying drawing 1; 2; shown in 3; by metal needle a; a flame probe has been constructed in the crack between its tip of b and the burner; adopt a metal needle; have flame detecting and electrion igniting dual-use function concurrently; metal needle is by being loaded on the high temperature resistant support (29) that insulate with metal stone or metal plate for standing a stove on as a precaution against fire (9); the high-tension electricity fire should be satisfied from the burner gap in its tip; can survey flame reliably again has or not; this metal needle is terminal to be electrically connected with flame detection circuit (1) or (2) input; be connected to the high-tension ignition circuit output end simultaneously; it is the secondary output end of step-up transformer B2; during for fear of high voltage arc; its high voltage is to the danger of flame detection circuit puncture, and string has big resistance R 1 or R2 between metal needle and the flame detection circuit input, simultaneously between input and ground and meet protective circuit of diode (D1; D2; C1 or D3; D4; C2).Can certainly adopt two metal needles, wherein one is the flame probe, and another is the high-tension ignition pin, the big resistance of above-mentioned series connection and and connect protective circuit of diode and then can omit;

Flame detection circuit is made of dc amplifier H1 or H2, its in-phase input end ground connection, its open-loop gain infinity, it is a zero potential comparator, (not electricity fire) in-phase input end is unsettled when no flame, it is output as high potential, and when flame, (burner ground connection) produces a negative potential between metal probe and the burner.Make dc amplifier output becoming electronegative potential;

During the twin furnace head (double burner), flame detection circuit (1) and (2) output connect gating circuit (3) input, and gating circuit is made of clamped circuit of D5R3, D6R4 and nor gate F1;

Nor gate F1 output connects warning circuit (4) input, also connects high-tension ignition circuit (5) input simultaneously, and secondary oscillating circuit that warning circuit is made of F5, F6, F7, F8 etc. and triode BG1 and loudspeaker Y constitute; The oscillating circuit that the high-tension ignition circuit is made of F9, F10 etc., step-up transformer B1, B2, reach diode D7 rectification, controllable silicon BCR charge-discharge circuit formation, B2 level output of step-up transformer connects the discharge igniting pin, serial connection because of metal probe produces the mistake detectable signal when the double burner in order to avoid, and establishes discharging gap K at B2 time grade;

When lighting a fire again for fear of stopping working for some reason, repeatedly igniting gets nowhere and causes gas leak, if close the air valve circuit automatically, be at gating circuit (3) output, connect valve-closing gate circuit (6) by RC charge-discharge circuit (7), the valve-closing gate circuit comprise NAND gate F2, with door F3, a F4, triode BG3, BG4, BG5, BG6, power amplification rear drive closing valve executing agency;

Motor closing valve executing agency (as Fig. 4); comprise a pair of gear that is meshed (12), (14); gear (14) is loaded on the motor shaft; gear (12) is loaded on the valve switch axle (11); slidably rotation; gear (12) installs a depression bar (13), and when pressing microswitch Ka or Kb, switch 1-2 connects; misfire this moment; rotate counterclockwise turn-knob (10) (turn-knob and gear (12) are fixing) during igniting, switch 1-3 connects, and holding circuit forms the loop; discharge igniting when opening; use is if motor gets electric rotation, and (spark delay then again) is with automatic-closing valve.

Electromagnet closing valve mechanism (Fig. 5), comprise and be loaded on the axle sleeve (28) that slidably rotates on the valve switch axle, compression column with fixed on the axle sleeve (13) and pivoted arm (15), and be loaded on the axle (27) on slidably the rotation ratchet (20), be fixed with wind spring (25) on it, wind spring one end is fixed on the screw (26), and screw is fixed on the stone or metal plate for standing a stove on as a precaution against fire panel, also be fixed with pivoted arm (19) on the ratchet, be connected by connecting rod (17) and pivoted arm (15) are alive, when air valve is closed, (not opening K switch A or KB), pivoted arm pivot pin (16) is in the right-hand member of crank-guide way (18), during igniting, be rotated counterclockwise turn-knob, pivoted arm (15) also is rotated counterclockwise ratchet by connecting rod, tighten wind spring, and by lever (21) ratchet non-return, (23) are balance pivot, and (22) are extension spring, electromagnet (24) when electric, inhale moving lever, ratchet turns clockwise under the wind spring effect, thereby closes gas check valve, the groove (18) of connecting rod (17) is to design for regulate the valve size in combustion process.

The above-mentioned double burner protective device structure that is configured to for single burner, then can omit gating circuit (3), and adopt a dc amplifier on circuit.

Below summary is lighted a fire and the protection process, if only open K switch A, KA1-3 connects, H1 work, be output as high potential, nor gate M end is height, (this moment, H2 did not work), and the N end is for low, Q brings out to low, warning circuit and high-tension ignition circuit are all worked, and metal needle a discharge igniting is with Times one sound, the expression igniting, after flame produced, probe a detected a negative potential, made the H1 upset, be output as electronegative potential, or the door be output as high potential, warning circuit and high-tension ignition circuit all quit work, igniting is finished;

If stop working for some reason in the combustion process, the negative potential that detects disappears, and it is high potential output that H1 overturns again, and nor gate is output as low again, just row igniting and warning again;

In particular cases, middle stopping working when lighting a fire automatically again, if repeatedly igniting is unsuccessful, arrive when the delay circuit C3 charging interval, F2 is output as high potential, this moment, H1 output also was high potential, make with door F3 and be output as high potential, BG3, BG4 work, drive motors or electromagnet or magnetic valve work, close source of the gas, guarantee safety.

Claims

1, novel gas cooking stove electronic ignition safety guard, be characterised in that, it comprises is fixed in that insulating support (29) is gone up, its most advanced and sophisticated metal needle near burner (8), and its terminal flame detection circuit input that is electrically connected is connected to high-tension ignition circuit (5) output simultaneously; The flame detection circuit output connects the high-tension ignition circuit input end, while and circuit taking alarm (4) input; The flame detection circuit output connects valve-closing gate circuit (6) by delay circuit (7), the valve-closing gate circuit, and its output drives closing valve executing agency and power supply and protective device box body.

2, according to the described novel gas cooking stove of claim 1 electronic ignition safety guard, it is characterized in that when gas stove is double burner, one-level gating circuit (3) being arranged between flame detection circuit and high-tension ignition circuit, the warning circuit.

3, according to claim 1 or 2 described novel gas cooking stove electronic ignition safety guards, it is characterized in that, flame detection circuit (1) or (2) are made of dc amplifier H1 or H2, its in-phase input end connects metal needle by resistance, while also connects protective circuit of diode, its reverse inter-input-ing ending grounding; Gating circuit (3) is made of clamped circuit and the nor gate that resistance and diode constitute; Delay circuit (7) is the RC charge-discharge circuit; Valve-closing gate circuit (6) is made of gate circuit and triode power amplifier; Closing valve executing agency is paid by motor gear and constitutes, or is made of electromagnet, spring energy-storage ratchet, connecting rod, or is electromagnetic valve.

According to the described novel gas cooking stove of claim 3 electronic ignition safety guard, it is characterized in that 4, the metal needle of corresponding each burner can be two, wherein one connects the flame detection circuit input, and another connects the high-tension ignition circuit output end.