CN101382303B - Control device preventing dry fry for household gas kitchen range - Google Patents
Control device preventing dry fry for household gas kitchen range Download PDFInfo
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Abstract
The invention discloses a control device protecting against dry heating of household gas stoves, which comprises a power source, a stopcock, and an electromagnetic valve and a thermoelectric couple that are serially connected; the control device protecting against dry heating is characterized in that: a power supply switch K2 of the control device protecting against dry heating, which can be communicated along with the rotation of a pressing knob is arranged inside the stopcock; the control device protecting against dry heating consists of a temperature sensor, a comparison circuit and a delay protecting circuit, the temperature sensor Rt is contacted with the pot bottom and served as an input voltage divider resistance of the comparison circuit to be connected with an input end of the comparison circuit, an output end of the comparison circuit is connected with an input end of the delay protecting circuit, and an output end of the delay protecting circuit is connected with two ends of a coil of the electromagnetic valve. An adjustable multi-partition bridge resistor Rx that is used for setting different action shifts can be arranged inside the comparison circuit. The control device protecting against dry heating of household gas stoves has simple structure and low price, and is economical and practical.
Description
Technical field
The present invention relates to a kind of gas-cooker control device, especially a kind of control device preventing dry fry for household gas kitchen range.
Background technology
Existing household gas utensils generally all adopt pulse firing, Fig. 1 is the structural representation of pulse ignition device, Fig. 2 is its circuit block diagram, the pulse ignition device of Fig. 1 comprises: power supply 10, pulse firing circuit 20, be located at ignitor, air valve 1, magnetic valve 2, thermocouple 3 on the burner, described plug valve 1 is connected with described magnetic valve 2, and when promptly must two valves opening entirely, burner could feed combustible gas, as long as one of them is closed, burner 5 does not all have gas.Two outputs of described thermocouple 3 connect the two ends of the magnetizing coil 6 of magnetic valve 2 respectively, and described air valve 1 is made up of plug valve 7, ignition switch K1, the knob 4 of pushing of controlling plug valve 7 and ignition switch K1.Press down and push knob 4, make K1 make pulse firing circuit 20, produce discharge spark on the electrode, magnetic valve 2 is opened; Even rotary push knob 4 plug valves 7 are opened, combustion gas enters burner 5 by appendix and is ignited by the discharge spark on the electrode, flame heat thermocouple 7, and the thermoelectrical potential that thermocouple produces makes magnetic valve keep open mode.After several seconds, unclamp and push knob 4, the position of rotation of pushing knob 4 is constant, plug valve 7 still is held open state, pushes knob and upwards get back to original height under the effect of spring 8, and this moment, ignition switch K1 cut off, because magnetic valve and plug valve all are in opening, burner burns away.
Described circuit comprises power supply and pulse firing circuit, one is connected power supply and pulse firing circuit with the ignition switch K1 of plug valve interlock, when ignition switch K1 connects, power supply is to the pulse firing circuit supply, the pulse firing circuit produces high-voltage pulse, and, be used to light combustion gas by being located at the sparking electrode discharge generation spark on the burner; Ignition switch K1 also connects power supply and magnetic valve simultaneously, makes magnetic valve open, and lights via plug valve and magnetic valve to be sprayed by burner, and is lighted.After several seconds, unclamp and push knob, K1 disconnects, and pulse firing circuit and magnetic valve all are cut off.Because the idol of thermocouple 3 connect the end and was heated this moment, produced thermoelectrical potential, kept magnetic valve and was in the enable possition.
Above-mentioned pulse ignition device has the accident extinguishing automatic closing function, and when stopping working when meeting accident, but the automatic self-closing gas pipeline prevents gas leakage.
But this gas kitchen ranges does not possess the anti-dry overheat protective function, when the user leaves cooking stove, often dryouies the situation of pot, causes the cooker damage, and is serious in the initiation fire accident.
The patent application that the temperature automatically controlled gas-cooker control device of official seal burning is arranged is in a large number arranged.As:
Application number 91217975.9 temperature control gas furnaces and pot, it mainly is: have the thermocouple of electric heating magnetic safety valve to be fixed on burner top, be connected in series microswitch in its loop, in the burner mesopore push rod is arranged, can be adsorbed on the bottom and be equipped with on the bottom of a pan of soft magnetic bodies, when kettle temperature reaches curie point, push rod falls, touch microswitch, the loop that cuts off thermocouple is that safety valve cuts off fuel gas source.Described stove and pot water are boiled, but auto extinguishing when meal boils also can be made general gas stove usefulness, meet accident extinguishing and can cut off source of the gas automatically, and security is good.This patent structure is simple, when needs are provided with soft magnetic bodies in the bottom of a pan, uses to be subjected to the pot restriction.
ZL96250293.6 gas-cooker microcomputer controller, this controller has shell fragment promptly as the control core, make temperature sensor by thermistor, cooperate the A/D converting member to detect cooking bottom temperature, there is single-chip microcomputer to send the information control magnetic valve and the actuating of relay,, realizes regularly boiling so that in time turn-off gas circuit, functions such as automatic boiling water, overtemperature alarm stop working.This controller control accuracy height, function is strong, and is safe and reliable, is applicable to the gas kitchen ranges of band temperature sensor.
Application number 00106948.9 burner, the present invention discloses a kind of burner, the action of the burner the when running of correctly burning stops to be handled, easy to use and good operability, described burner has temperature sensor to detect the temperature of general gas kitchen range heated main body kitchen range roof box in the burning running, when it reaches overheated judgement temperature when above, just forcibly magnetic valve cuts out, and utilize warning light and prompting buzzer to point out, then, when the temperature sensor detected temperatures is lower than can make the general gas kitchen range operating temperature is following once more the time, utilize warning light and prompting buzzer that this is pointed out.
Application number 02111254.1 numerically controlled intelligent gas-burning stove and control method, two burners that left and right symmetry is arranged on the kitchen range shell of this device, in the middle of the kitchen range shell and in the kitchen range shell, be provided with electric appliance control box, rear portion at electric appliance control box is provided with gas sensor, anterior and on the kitchen range shell, be provided with the liquid crystal display control box at the kitchen range shell, the liquid crystal display control box is connected with electric appliance control box by digital control circuit, and burner is connected with electric controlled regulating valve by pipeline, and electric controlled regulating valve is connected with main valve by pipeline; At the other pressing switch that is provided with of the side of a burner; Be sequentially with flame detector, igniter, temperature sensor in the centre of a burner; This device uses digital circuit microcontroller able to programme to realize the programme-control function.Advantage of the present invention: have full-automatic electronic igniting, the adjusting of touch firepower, temperature control function; Anti-dry or burn and use the safety protection function of the gentle responsive inductive switch of flame inductive switch.
Above-mentioned three patents all adopt microcomputer control, and according to use different serviceability temperatures are set, and reach temperature automatically controlled and flame-out.This apparatus structure complexity is used trouble, and impracticable, and for example cooking rice needs after the boiling with little fire the water consumption to be done, and it is relevant that the time that consumption is done and the water yield and rice are measured, very difficult with one accurately delay time control and can't be adjusted to little fire automatically; And for example cooking, oily temperature is fixed on 130 ℃, when temperature sensor records cooking bottom temperature and reaches 130 ℃, can not control and keep this temperature, for the regularly flame-out not meaning of cooking, it is very big that the duration and degree of heating of cooking is grasped randomness, can't limit with the time, therefore temperature adjustment is set and delays time to have little significance and to make the complex structure of device, the cost height.
In view of this special proposition the present invention.
Summary of the invention
The technical problem to be solved in the present invention is to overcome the deficiencies in the prior art, and a kind of simple in structure, cheap, economic and practical control device preventing dry fry for household gas kitchen range with anti-dry overheat protective function is provided.
Another object of the present invention is to provide a kind of and provide the accurately control device preventing dry fry for household gas kitchen range of control of many gears by many segmentations adjustable electric resistor bridge Rx.
For solving the problems of the technologies described above, the present invention adopts the basic design of technical scheme to be: a kind of control device preventing dry fry for household gas kitchen range, comprise magnetic valve, the thermocouple of power supply, plug valve and series connection thereof, it is characterized in that: be provided with in the described plug valve with pushing the control device preventing dry fry power switch K2 that the knob rotation is connected; Control device preventing dry fry is made up of temperature sensor, comparison circuit and delay protection circuit, described temperature sensor Rt contacts with the bottom of a pan, it is the input of the input divider resistance access comparison circuit of circuit as a comparison, the output of comparison circuit connects the input of delay protection circuit, and the output of delay protection circuit is connected with the coil two ends of magnetic valve; Perhaps in comparison circuit, be provided with many segmentations adjustable electric resistor bridge Rx so that control is more accurate.
Described comparison circuit be by operational amplifier U1, be connected to series connection divider resistance R12 and the R13 between power supply and the ground and be connected to power supply and ground between temperature sensor and the series circuit of resistance R 14 constituted; The input that the node of described series connection divider resistance R12 and R13 connects operational amplifier just provides a burning voltage; Described access is the temperature sensor Rt and resistance R 14 series connection of decision circuitry input relatively, and the input divider resistance of decision circuitry is connected between power supply and the ground as a comparison, and the series connection contact of temperature sensor Rt and resistance R 14 connects the input of operational amplifier U1 and bears.
Described delay protection circuit be by operational amplifier U2, be connected to series connection divider resistance R19 and the R20 between power supply and the ground and be connected to power supply and ground between capacitor C 5 and the time-delay series circuit of resistance R 23 constituted, the serial connection point of described series connection divider resistance R19 and R20 connects the input anode of operational amplifier U2, and the serial connection point of capacitor C 5 and resistance R 23 is connected to the input negative terminal of operational amplifier U2; The two ends of described resistance R 23 backward dioded D14 in parallel; Connect described magnetic valve between the output of power supply and operational amplifier U2, and positive and negative terminal is opposite with the positive and negative terminal of the thermocouple that connects magnetic valve.
Be provided with a dry combustion method warning and delaying circuit, described dry combustion method warning and delaying circuit be by operational amplifier U3, be connected to series connection divider resistance R16 and the R17 between power supply and the ground and be connected to power supply and ground between capacitor C 4 and the time-delay series circuit of resistance R 18 constituted, the serial connection point of described series connection divider resistance R16 and R17 connects the input anode of operational amplifier U3, and the serial connection point of capacitor C 4 and resistance R 18 is connected to the input negative terminal of operational amplifier U3; The two ends of described resistance R 18 backward dioded D11 in parallel; Connect buzzer Fm and pulse firing circuit between the output of power supply and operational amplifier U3.
Be provided with a undervoltage warning circuit, described undervoltage warning circuit is made up of operational amplifier U4, the series connection divider resistance R1 and the R2 that are connected between power supply and the ground, the serial connection point of described divider resistance R1 and R2 connects the input anode of operational amplifier U4, the input negative terminal connecting resistance R4 of described operational amplifier U4, the serial connection point of R5, another termination power of resistance R 4, the other end ground connection of resistance R 5, meet Zener diode D1 between power supply and the ground, connect buzzer between the output of power Vcc and operational amplifier U4.
During work; described temperature sensor Rt contacts with the bottom of a pan; it is the input of the input divider resistance access comparison circuit of circuit as a comparison; when dry combustion method; the output output control level of comparison circuit, through suitable time-delay, the current potential that the output of the output of delay protection circuit is opposite with the coil two ends of magnetic valve; cut off magnetic valve, implement protection.
Of the present invention simple in structure, easy to maintenance, can also be provided with dry combustion method warning circuit and undervoltage warning circuit, with audible alarm, the prompting user in time handles when closing the gas check valve burn-out.
For architectural feature of the present invention and effect thereof are had further understanding, enumerate specific embodiment now and be described with reference to the accompanying drawings as follows.
Description of drawings
Fig. 1 is existing pulse firing gas range igniter schematic diagram;
Fig. 2 is existing pulse firing gas range igniter circuit block diagram;
Fig. 3 is the scheme of installation of control device preventing dry fry for household gas kitchen range temperature sensor of the present invention;
Fig. 4 is the embodiment circuit block diagram of control device preventing dry fry for household gas kitchen range of the present invention;
Fig. 5 is the embodiment circuit diagram of control device preventing dry fry for household gas kitchen range of the present invention;
Fig. 6 is another embodiment circuit diagram of control device preventing dry fry for household gas kitchen range of the present invention.
The specific embodiment
Below introduce one embodiment of the present of invention:
A kind of control device preventing dry fry for household gas kitchen range comprises magnetic valve, the thermocouple of power supply, plug valve and series connection thereof, is provided with in the described plug valve with pushing the control device preventing dry fry power switch K2 that the knob rotation is connected; Control device preventing dry fry is made up of temperature sensor, comparison circuit and delay protection circuit.
Described temperature sensor Rt contacts with the bottom of a pan; it is the input of the input divider resistance access comparison circuit of circuit as a comparison; the output of comparison circuit connects the input of delay protection circuit, and the output of delay protection circuit is connected with the coil two ends of magnetic valve.
Except that above-mentioned essential features, in specific implementation process, also can replenish following technology contents.
Described comparison circuit be by operational amplifier U1, be connected to series connection divider resistance R12 and the R13 between power supply and the ground and be connected to power supply and ground between temperature sensor and the series circuit of resistance R 14 constituted; The input that the node of described series connection divider resistance R12 and R13 connects operational amplifier just provides a burning voltage; Described access is the temperature sensor Rt and resistance R 14 series connection of decision circuitry input relatively, the input divider resistance of decision circuitry is connected between power supply and the ground as a comparison, the series connection contact of temperature sensor Rt and resistance R 14 connects the input of operational amplifier U1 and bears, when temperature sensor overheated, resistance increases, when the series connection junctional potential of temperature sensor and resistance R 14 was lower than the node potential of series connection divider resistance R12 and R13, operational amplifier U1 exported electronegative potential.
Described delay protection circuit be by operational amplifier U2, be connected to series connection divider resistance R19 and the R20 between power supply and the ground and be connected to power supply and ground between capacitor C 5 and the time-delay series circuit of resistance R 23 constituted, the serial connection point of described series connection divider resistance R19 and R20 connects the input anode of operational amplifier U2, and the serial connection point of capacitor C 5 and resistance R 23 is connected to the input negative terminal of operational amplifier U2; The two ends of described resistance R 23 backward dioded D14 in parallel; Connect described magnetic valve between the output of power supply and operational amplifier U2, and positive and negative terminal is opposite with the positive and negative terminal of the thermocouple that connects magnetic valve; Generally speaking, the input current potential of the series connection contact of capacitor C 5 and resistance R 23 equals power supply potential Vcc, and operational amplifier output terminal output this moment high level does not have influence to the output of thermocouple; When the series connection contact of capacitor C 5 and resistance R 23 is imported electronegative potential, operational amplifier U2 exports electronegative potential, power Vcc puts on magnetic valve with the voltage direction that is in reverse to thermocouple, the magnetic valve outage is closed, power Vcc gives capacitor C 5 chargings by resistance R 23 simultaneously, and through the certain time-delay time, the input current potential returns to Vcc, operational amplifier output terminal output high level no longer works to thermocouple.
Described gas-cooker control device preventing dry fry, be provided with a dry combustion method warning and delaying circuit, described dry combustion method warning and delaying circuit be by operational amplifier U3, be connected to series connection divider resistance R16 and the R17 between power supply and the ground and be connected to power supply and ground between capacitor C 4 and the time-delay series circuit of resistance R 18 constituted, the serial connection point of described series connection divider resistance R16 and R17 connects the input anode of operational amplifier U3, and the serial connection point of capacitor C 4 and resistance R 18 is connected to the input negative terminal of operational amplifier U3; The two ends of described resistance R 18 backward dioded D11 in parallel; Connect buzzer R21 and pulse firing circuit between the output of power supply and operational amplifier U3; Generally speaking, the input current potential of the series connection contact of capacitor C 4 and resistance R 18 equals power supply potential Vcc, operational amplifier output terminal output this moment high level, and the buzzer two ends do not have pressure drop; When the series connection contact of capacitor C 4 and resistance R 18 was imported electronegative potential, operational amplifier U3 exported electronegative potential, and buzzer powers alarm; Power Vcc gives capacitor C 4 chargings by resistance R 18 simultaneously, and through the certain time-delay time, the input current potential returns to Vcc, operational amplifier output terminal output high level, and the buzzer outage stops to report to the police.
Described gas-cooker control device preventing dry fry, it is characterized in that: be provided with a undervoltage warning circuit, described undervoltage warning circuit is made up of operational amplifier U4, the series connection divider resistance R1 and the R2 that are connected between power supply and the ground, the serial connection point of described divider resistance R1 and R2 connects the input anode of operational amplifier U4, the input negative terminal connecting resistance R4 of described operational amplifier U4, the serial connection point of R5, another termination power of resistance R 4, the other end ground connection of resistance R 5, meet Zener diode D1 between power supply and the ground, connect buzzer between the output of power Vcc and operational amplifier U4; When supply voltage was higher than rated voltage, operational amplifier U4 exported high potential, buzzer two ends absence of voltage; When supply voltage was lower than rated voltage, operational amplifier U4 exported electronegative potential, and there is voltage drop at the buzzer two ends, buzzer warning.
Fig. 3, Fig. 4 are anti-dry heating gas-cooker igniter schematic diagram of the present invention and circuit block diagram.
Gas-cooker control device preventing dry fry provided by the invention comprises: power supply 10, by pulse ignition switch K1, pulse firing circuit 20 and be located at the pulse ignition device that ignitor constituted on the burner 5, plug valve 7 and the magnetic valve 2 of connecting with plug valve 7, the accident extinguishing automatic gas-off device that is made of thermocouple 3 and described magnetic valve 2, have with pushing that knob 4 presses down and air-electricity linkage valve 1 and the anti-dry circuit 30 of the pulse ignition switch K1 that connects.Above-mentioned composition structure is same as the prior art, is not described in detail.
Gas-cooker control device preventing dry fry difference with the prior art provided by the present invention mainly is: be provided with in described plug valve 1 with pushing the power switch K2 that the knob rotation is connected; Described control device preventing dry fry is made up of temperature sensor Rt, comparison circuit 31 and delay protection circuit 32; wherein said temperature sensor Rt contacts with the bottom of a pan; it is the input of the input divider resistance access comparison circuit 31 of circuit 31 as a comparison; the output of comparison circuit 31 connects the input of delay protection circuit 32, and the output of delay protection circuit 32 is connected with the coil two ends of magnetic valve 2.
Fig. 5 is gas-cooker control device preventing dry fry physical circuit figure of the present invention.As seen from the figure, described comparison circuit be by operational amplifier U1, be connected to series connection divider resistance R12 and the R13 between power supply and the ground and be connected to power supply and ground between temperature sensor and the series circuit of resistance R 14 constituted; The input that the node of described series connection divider resistance R12 and R13 connects operational amplifier just provides a stable setting voltage; Setting different operating temperatures as need only needs to switch between different resistances by power switch K2 at the parallel resistance Rx of R12 place; Described access is the input temperature sensor Rt and resistance R 14 series connection of decision circuitry 31 relatively; the input divider resistance of decision circuitry 31 is connected between power supply and the ground as a comparison; the series connection contact of temperature sensor Rt and resistance R 14 connects the input of operational amplifier U1 and bears; when temperature sensor overheated; resistance increases; when the series connection junctional potential of temperature sensor and resistance R 14 was lower than the node potential of series connection divider resistance R12 and R13, operational amplifier U1 output electronegative potential was used to control dry combustion method protection action delay circuit operation.
The delay protection circuit is accepted the signal controlling magnetic valve deferred action a period of time from comparison circuit, treats thermocouple cooling back outage, makes magnetic valve be in closed condition, prevents that combustion gas from overflowing.Physical circuit be by operational amplifier U2, be connected to series connection divider resistance R19 and the R20 between power supply 10 and the ground and be connected to power supply and ground between capacitor C 5 and the time-delay series circuit of resistance R 23 constituted, the serial connection point of described series connection divider resistance R19 and R20 connects the input anode of operational amplifier U2, and the serial connection point of capacitor C 5 and resistance R 23 is connected to the input negative terminal of operational amplifier U2; The two ends of described resistance R 23 backward dioded D14 in parallel; Connect described magnetic valve between the output of power supply and operational amplifier U2, and positive and negative terminal is opposite with the positive and negative terminal of the thermocouple that connects magnetic valve; Generally speaking, the input current potential of the series connection contact of capacitor C 5 and resistance R 23 equals power supply potential Vcc, and operational amplifier output terminal output this moment high level does not have influence to the output of thermocouple; When the series connection contact of capacitor C 5 and resistance R 23 was imported electronegative potential, operational amplifier U2 exported electronegative potential, and power Vcc puts on magnetic valve with the voltage direction that is in reverse to thermocouple, and the magnetic valve outage is closed, and the blocking-up gas-flow is realized closing fire and died to burner.Power Vcc gives capacitor C 5 chargings by resistance R 23 simultaneously, through the certain time-delay time.The input current potential returns to Vcc, and operational amplifier output terminal output high level no longer works to thermocouple.Because flame-out through the pressure of certain hour, thermocouple has been in the state of cooling, the thermoelectrical potential deficiency that is produced so that the magnetic valve adhesive keep dying.
Dry combustion method has taken place for informing the user, the present invention also is provided with a dry combustion method warning and delaying circuit, described dry combustion method warning and delaying circuit be by operational amplifier U3, be connected to series connection divider resistance R16 and the R17 between power supply and the ground and be connected to power supply and ground between capacitor C 4 and the time-delay series circuit of resistance R 18 constituted, the serial connection point of described series connection divider resistance R16 and R17 connects the input anode of operational amplifier U3, and the serial connection point of capacitor C 4 and resistance R 18 is connected to the input negative terminal of operational amplifier U3; The two ends of described resistance R 18 backward dioded D11 in parallel; Connect buzzer Fm and pulse firing circuit between the output of power supply and operational amplifier U3; Generally speaking, the input current potential of the series connection contact of capacitor C 4 and resistance R 18 equals power supply potential Vcc, operational amplifier output terminal output this moment high level, and buzzer Fm does not have pressure drop in two ends; When the series connection contact of capacitor C 4 and resistance R 18 was imported electronegative potential, operational amplifier U3 exported electronegative potential, and buzzer powers alarm; Power Vcc gives capacitor C 4 chargings by resistance R 18 simultaneously, and through the certain time-delay time, the input current potential returns to Vcc, operational amplifier output terminal output high level, and buzzer Fm outage stops to report to the police.The long meeting of time of fire alarming causes battery consumption excessive.
The present invention also is provided with a undervoltage warning circuit 40 and in time changes battery to remind the user, described undervoltage warning circuit 40 is made up of operational amplifier U4, the series connection divider resistance R1 and the R2 that are connected between power supply and the ground, the serial connection point of described divider resistance R1 and R2 connects the input anode of operational amplifier U4, the input negative terminal connecting resistance R4 of described operational amplifier U4, the serial connection point of R5, another termination power of resistance R 4, the other end ground connection of resistance R 5, meet Zener diode D1 between power supply and the ground, meet buzzer FM between the output of power Vcc and operational amplifier U4; When supply voltage was higher than rated voltage, operational amplifier U4 exported high potential, buzzer two ends absence of voltage; When supply voltage was lower than rated voltage, operational amplifier U4 exported electronegative potential, and there is voltage drop at buzzer FM two ends, and buzzer Fm reports to the police.
Following an alternative embodiment of the invention.
A kind of control device preventing dry fry for household gas kitchen range of many gears comprises magnetic valve, the thermocouple of power supply, plug valve and series connection thereof, is provided with in the described plug valve with pushing the control device preventing dry fry power switch K2 that the knob rotation is connected; Control device preventing dry fry is made up of temperature sensor, comparison circuit and delay protection circuit; be provided with in the described comparison circuit in order to set many segmentations adjustable electric resistor bridge Rx (consulting Fig. 6) of different action gears; choose different resistance R x values; can adjust the setting of dry combustion method alarm temperature; adapt to different cooking job requirements, make gas-cooker can adapt to multiple needs.
Adjust the mode of resistance R x value, can adopt the structure of wirewound potential meter or step resistance device, independent or with power switch K2 synchronous interaction.As shown in Figure 6, many segmentations adjustable electric resistor bridge Rx adopts independent structure, and all the other structures can partly or entirely adopt the foregoing description circuit.
Claims (5)
1. control device preventing dry fry for household gas kitchen range comprises it is characterized in that magnetic valve, the thermocouple of power supply, plug valve and series connection thereof: be provided with in the described plug valve with pushing the control device preventing dry fry power switch K2 that the knob rotation is connected; Control device preventing dry fry is made up of temperature sensor, comparison circuit and delay protection circuit, described temperature sensor Rt contacts with the bottom of a pan, it is the input of the input divider resistance access comparison circuit of circuit as a comparison, the output of comparison circuit connects the input of delay protection circuit, and the output of delay protection circuit is connected with the coil two ends of magnetic valve; Described delay protection circuit be by operational amplifier U2, be connected to series connection divider resistance R19 and the R20 between power supply and the ground and be connected to power supply and ground between capacitor C 5 and the time-delay series circuit of resistance R 23 constituted, the serial connection point of described series connection divider resistance R19 and R20 connects the input anode of operational amplifier U2, and the serial connection point of capacitor C 5 and resistance R 23 is connected to the input negative terminal of operational amplifier U2; The two ends of described resistance R 23 backward dioded D14 in parallel; Connect described magnetic valve between the output of power supply and operational amplifier U2, and positive and negative terminal is opposite with the positive and negative terminal of the thermocouple that connects magnetic valve.
2. control device preventing dry fry for household gas kitchen range comprises it is characterized in that magnetic valve, the thermocouple of power supply, plug valve and series connection thereof: be provided with in the described plug valve with pushing the control device preventing dry fry power switch K2 that the knob rotation is connected; Control device preventing dry fry is made up of temperature sensor, comparison circuit, delay protection circuit and dry combustion method warning and delaying circuit, described temperature sensor Rt contacts with the bottom of a pan, it is the input of the input divider resistance access comparison circuit of circuit as a comparison, the output of comparison circuit connects the input of delay protection circuit, and the output of delay protection circuit is connected with the coil two ends of magnetic valve; Described delay protection circuit be by operational amplifier U2, be connected to series connection divider resistance R19 and the R20 between power supply and the ground and be connected to power supply and ground between capacitor C 5 and the time-delay series circuit of resistance R 23 constituted, the serial connection point of described series connection divider resistance R19 and R20 connects the input anode of operational amplifier U2, and the serial connection point of capacitor C 5 and resistance R 23 is connected to the input negative terminal of operational amplifier U2; The two ends of described resistance R 23 backward dioded D14 in parallel; Connect described magnetic valve between the output of power supply and operational amplifier U2, and positive and negative terminal is opposite with the positive and negative terminal of the thermocouple that connects magnetic valve; Described dry combustion method warning and delaying circuit be by operational amplifier U3, be connected to series connection divider resistance R16 and the R17 between power supply and the ground and be connected to power supply and ground between capacitor C 4 and the time-delay series circuit of resistance R 18 constituted, the serial connection point of described series connection divider resistance R16 and R17 connects the input anode of operational amplifier U3, and the serial connection point of capacitor C 4 and resistance R 18 is connected to the input negative terminal of operational amplifier U3; The two ends of described resistance R 18 backward dioded D11 in parallel; Connect buzzer Fm and pulse firing circuit between the output of power supply and operational amplifier U3.
3. control device preventing dry fry for household gas kitchen range comprises it is characterized in that magnetic valve, the thermocouple of power supply, plug valve and series connection thereof: be provided with in the described plug valve with pushing the control device preventing dry fry power switch K2 that the knob rotation is connected; Control device preventing dry fry is made up of temperature sensor, comparison circuit, delay protection circuit and undervoltage warning circuit, described temperature sensor Rt contacts with the bottom of a pan, it is the input of the input divider resistance access comparison circuit of circuit as a comparison, the output of comparison circuit connects the input of delay protection circuit, and the output of delay protection circuit is connected with the coil two ends of magnetic valve; Described delay protection circuit be by operational amplifier U2, be connected to series connection divider resistance R19 and the R20 between power supply and the ground and be connected to power supply and ground between capacitor C 5 and the time-delay series circuit of resistance R 23 constituted, the serial connection point of described series connection divider resistance R19 and R20 connects the input anode of operational amplifier U2, and the serial connection point of capacitor C 5 and resistance R 23 is connected to the input negative terminal of operational amplifier U2; The two ends of described resistance R 23 backward dioded D14 in parallel; Connect described magnetic valve between the output of power supply and operational amplifier U2, and positive and negative terminal is opposite with the positive and negative terminal of the thermocouple that connects magnetic valve; Described undervoltage warning circuit is made up of operational amplifier U4, the series connection divider resistance R1 and the R2 that are connected between power supply and the ground, the serial connection point of described divider resistance R1 and R2 connects the input anode of operational amplifier U4, the input negative terminal connecting resistance R4 of described operational amplifier U4, the serial connection point of R5, another termination power of resistance R 4, the other end ground connection of resistance R 5, meet Zener diode D1 between power supply and the ground, connect buzzer between the output of power Vcc and operational amplifier U4.
4. according to claim 1 or 2 or 3 described control device preventing dry fry for household gas kitchen range, it is characterized in that: described comparison circuit be by operational amplifier U1, be connected to series connection divider resistance R12 and the R13 between power supply and the ground and be connected to power supply and ground between temperature sensor and the series circuit of resistance R 14 constituted; The input that the node of described series connection divider resistance R12 and R13 connects operational amplifier just provides a burning voltage; Described access is the temperature sensor Rt and resistance R 14 series connection of decision circuitry input relatively, and the input divider resistance of decision circuitry is connected between power supply and the ground as a comparison, and the series connection contact of temperature sensor Rt and resistance R 14 connects the input of operational amplifier U1 and bears.
5. control device preventing dry fry for household gas kitchen range comprises it is characterized in that magnetic valve, the thermocouple of power supply, plug valve and series connection thereof: be provided with in the described plug valve with pushing the control device preventing dry fry power switch K2 that the knob rotation is connected; Control device preventing dry fry is made up of temperature sensor, comparison circuit and delay protection circuit, be provided with in the described comparison circuit in order to set many segmentations adjustable electric resistor bridge R x of different action gears, described temperature sensor Rt contacts with the bottom of a pan, it is the input of the input divider resistance access comparison circuit of circuit as a comparison, the output of comparison circuit connects the input of delay protection circuit, and the output of delay protection circuit is connected with the coil two ends of magnetic valve; Described delay protection circuit be by operational amplifier U2, be connected to series connection divider resistance R19 and the R20 between power supply and the ground and be connected to power supply and ground between capacitor C 5 and the time-delay series circuit of resistance R 23 constituted, the serial connection point of described series connection divider resistance R19 and R20 connects the input anode of operational amplifier U2, and the serial connection point of capacitor C 5 and resistance R 23 is connected to the input negative terminal of operational amplifier U2; The two ends of described resistance R 23 backward dioded D14 in parallel; Connect described magnetic valve between the output of power supply and operational amplifier U2, and positive and negative terminal is opposite with the positive and negative terminal of the thermocouple that connects magnetic valve.
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| CN2007101460426A CN101382303B (en) | 2007-09-07 | 2007-09-07 | Control device preventing dry fry for household gas kitchen range |
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| CN2007101460426A CN101382303B (en) | 2007-09-07 | 2007-09-07 | Control device preventing dry fry for household gas kitchen range |
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| CN101382303A CN101382303A (en) | 2009-03-11 |
| CN101382303B true CN101382303B (en) | 2011-09-21 |
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| CN111219748A (en) * | 2019-10-24 | 2020-06-02 | 华帝股份有限公司 | Acceleration-based stove dry-burning-prevention control method and control system |
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| CN101382303A (en) | 2009-03-11 |
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Effective date of registration: 20210303 Address after: 266000 Haier Industrial Park, 236 qianwangang Road, Qingdao Economic and Technological Development Zone, Qingdao City, Shandong Province Patentee after: QINGDAO HAIER INTELLIGENT COOKING APPLIANCES CO., LTD. Patentee after: HAIER Group Corp. Address before: 266101 Industrial Park, 1 Haier Road, Qingdao hi tech Industrial Park, Shandong, China Patentee before: HAIER Group Corp. Patentee before: QINGDAO HAIER DISHWASHER Co.,Ltd. |