Summary of the invention
In order to overcome above-mentioned technical deficiency, the utility model provides a kind of novel solution, the magnetic material that replaces traditional magnetic steel temperature limiter inside with the thermostat that can reset certainly, replace utilizing microswitch and the lever that the lever motion stroke triggers with relay, realize the temperature automatic control function with electronic circuitry involved simultaneously.
Specifically, scheme of the present utility model is: a kind of pot courage temperature control system of electronics electric cooker comprises main heating board HR1 and the pot courage that is positioned on the described main heating board HR1; Also comprise temperature limiter 1 and relay 3, described temperature limiter 1 comprises temperature-sensitive shell and the self-resetting type thermostat of installing at described temperature-sensitive shell inner surface, described temperature limiter 1 housing is installed in the through hole of described heating board HR1 middle part and can be pressed on the bottom surface of described pot courage, and described temperature limiter 1 is connected in series with the normally opened contact 31 and the main heating board HR1 of relay 3; The coil 32 of described relay is connected in series from lock control and with described temperature limiter 1 by relay coil control circuit 5 and latching circuit 6 after starting by heating gauge tap circuit 7.Described self-resetting type thermostat can be Kick type thermostat or other type, though also have technical scheme to use the Kick type thermostat in the existing electric pressure cooking saucepan technology, but be mainly used in the pot inner pressure control system of electric pressure cooking saucepan, in the temperature of the heating plate of the electric pressure cooking saucepan heating board by Kick type thermostat indirect detection electric pressure cooking saucepan in the bottom offset process and then realize the pot inner pressure of electric pressure cooking saucepan is controlled, this programme then is applied in pot courage temperature detection dexterously, when heating is cooked, the pot courage is placed on the heating board, the temperature-sensitive upper surface of outer cover of temperature limiter 1 utilizes elastic pressure to touch a pot courage bottom, the temperature of pot courage will be passed to thermostat K1 by the housing of described temperature limiter 1, when temperature limiter 1 detected temperature surpasses the reset temperature that sets, thermostat K1 will automatically reset and disconnect the interlock circuit connection, thereby stop heating; The housing of described temperature limiter 1 is the container that temperature-resistant material such as metal is made, and is used to hold, protect thermostat K1, even and the temperature of pot courage that will experience pass to thermostat K1.Since described housing be pressed on pot courage below, so the basic temperature with the interior end of pot courage of the temperature of its impression is consistent; Certainly, under the situation that the mechanical strength of housing thermostat K1 allows, also can omit described housing fully and directly described thermostat K1 is installed in the through hole of described heating board HR1 middle part.
Described heating gauge tap circuit 7 is meant in relay coil drive circuit 5 and its current supply circuit the heating gauge tap SK1 of a control of serial connection electric cooker heating usefulness or connect simultaneously heating gauge tap SK1 and second diode D2 composition separately, be used to start the coil working of described relay 3, and the power supply that starts described heating board HR1 is simultaneously started working.
The utility model can also be, described latching circuit 6 is by one the 3rd diode D3 or directly be connected described relay coil drive circuit 5 with lead and constitute between the output 312 of relay normally open contact 31.Relay coil drive circuit and main power supply circuits form the loop after pressing heater switch, relay coil has electric current to pass through and produces magnetic field, the relay switch shell fragment is carried out the adhesive effect, the input 311 of normally opened contact 31 is communicated with output 312, and main heating board HR1 energising conducting begins heating.One input of latching circuit 6 directly is connected on the output 312 of relay road normally opened contact 31, the other end is connected with relay coil 32, therefore become relation in parallel with main heating board HR1 power supply circuits, when main heating board HR1 switches on, to there be the part electric current to constitute the loop with relay coil simultaneously by relay normally open contact 31 and latching circuit 6, the magnetic field that electric current by relay coil produces is enough to guarantee that the relay switch shell fragment is kept with the input 311 of normally opened contact 31 contacts, also promptly guaranteed the normal power supply of heating plate, this moment, whether heater switch disconnected closure, do not influence the operate as normal of main heating board, electric cooker still is in heated condition, thereby has realized auto-lock function.
The utility model can also be that described relay coil drive circuit 5 constitutes after forming the resistance-capacitance depressurization mode and described relay coil 32 is connected by dropping resistor R1 or electric capacity of described dropping resistor R1 series connection.By adjusting the parameter value of dropping resistor R1 or electric capacity, can obtain suitable electric current and make the coil of relay produce magnetic field, this magnetic field will produce active force to the relay switch shell fragment and carry out the switch adhesive.
The utility model can also be: described relay coil drive circuit 5 can also increase by one and drive triode Q1 formation, and the C of described driving triode Q1, the E utmost point are connected with described relay coil 32.The B that drives triode Q1 extremely can place two to drive between the resistance by common circuit design.
The utility model can also be: described relay coil drive circuit 5 can also be connected in parallel to described relay coil 32 branch roads by increase Zener diode Z1 and electrochemical capacitor EC1 and constitute simple filter circuit of pressure-stabilizing.By simple mu balanced circuit, the magnetic direction that relay coil 32 is produced continues consistent, and then direction is identical all the time to the switch shrapnel active force of relay R LY1 to make this magnetic field, thereby makes the input 311 and output 312 connected states of keeping relay normally open contact 31 after relay coil 32 energisings all the time.
The utility model can also be: also comprise heating indicating circuit 2, described heating indicating circuit 2 includes burner on light LED2 and described heating indicating circuit 2 is connected with described relay coil drive circuit 5 parallel connections or with described relay coil 32 branch roads.This circuit is made up of a burner on light at least, series connection burner on light LED2 is not only the luminous indicative function that can bring into play burner on light LED2 itself in described heating indicating circuit 2, and owing to itself be a light emitting diode, function with unidirectional conducting, so the relay coil drive circuit 5 that is attached thereto has also been played the effect of a halfwave rectifier, thereby the sense of current that has guaranteed to flow through relay coil 32 is constant, also can ensure the operate as normal of relay coil 32 in the situation of additional filter circuit of pressure-stabilizing not.
The utility model can also be: also comprise keeping warm mode indication road 4, described keeping warm mode indication road 4 by at least one insulation indicator lamp LED1 separately or be connected in parallel on again between the described relay normally open contact 31 after first resistance R 4 is connected.Can connect heat retaining and exothermal device HR2 in the appropriate location of major loop.Keeping warm mode indicating circuit 4 and main heating board HR1, thermostat K1 or form the loop with the first diode D1 that is connected in parallel on the thermostat K1, when electric cooker at initial plug-in state, thermostat K1 is in closure state because of its environment temperature is lower than its OFF temperature value, do not press as heater switch SK1 this moment and be in off-state, so relay coil drive circuit 5 does not form the loop, relay coil 32 no currents flow through, relay contact switch is in off-state, electric current is divided into two-way at this moment, one the tunnel directly along heat retaining and exothermal plate HR2 and thermostat K1 conducting, warming plate HR2 heating this moment, electric cooker only is output as insulation power; Another curb master heating board HR1, first resistance R 4 and insulation indicator lamp LED1 and thermostat K1 form the loop, wherein, because first resistance R, 4 resistances are bigger, therefore less by the electric current of main heating board HR1, main heating board HR1 does not generate heat substantially, is incubated indicator lamp LED1 Chang Liang this moment; When the detected electric cooker pot of thermostat K1 courage temperature reached its reset temperature above its control device, thermostat K1 automatically reset and is in off-state, and this moment, electric current formed the loop by the first diode D1 in parallel with thermostat K1.
The utility model can also be: comprise preservation and controlling circuit 8, described preservation and controlling circuit 8 by preservation and controlling switch S K2 separately or be connected in parallel on described relay coil 32 two ends or its branch road after second resistance R 3 is connected.Insulation commutation circuit by this connected mode formation, when is heating at the electric cooker place, if the people is for pushing preservation and controlling switch S K2, to make by relay coil 32 electric currents and reduce or make to drive triode Q1 and end, and then the input 311 of relay normally open contact contacts with output 312 disconnections, therefore electric cooker goes to keeping warm mode, thereby has reached the function of preservation and controlling.
The beneficial effects of the utility model are:
1, cost reduces, and the magnetic material of the utility model by replacing the relatively costly magnetic steel temperature limiter inside of tradition with the thermostat K1 that can reset certainly with low cost greatly reduces production cost.
2, stability improves, be installed in the through hole of heating board HR1 middle part by the thermostat K1 that can reset certainly, cooperate again and utilize relevant control circuit, can be switched on or switched off power supply automatically and accurately in good time, simultaneously, cancelled and utilized lever motion stroke triggering microswitch and lever in traditional mechanical electric cooker and use relay R LY1 to replace, burn pot or malfunction phenomenon thereby can avoid magnet steel formula machinery electric cooker to cause effectively, reduce problems such as the fault rate of mechanical type electric cooker and control accuracy are low greatly because of machine driving is bad.
3, security improves, by with the preservation and controlling switch in parallel in designs such as relay coil circuit or its branch road two ends, can prevent that artificial to press burning pot that the lever button may cause in the utensil external forced dangerous.
4. simple in structure, the simple electronic circuit of the utility model utilization has been realized automatic temperature-adjusting control, has avoided the labyrinth that must be equipped with parts such as lever, microswitch, lever button of traditional mechanical type temperature control system.
The specific embodiment
As shown in Figure 3, heating board HR1 middle part has through hole, limit temperature controller 1 inside is equipped with thermostat K1 and is installed on the middle part through hole of heating board HR1, and the pot courage can contact the temperature-sensitive upper surface of limit temperature controller 1 when putting down, and thermostat K1 selects the Kick type thermostat that can reset certainly for use.
As accompanying drawing 1,2, shown in 4, thermostat K1, the normally opened contact 31 of relay R LY1, main heating board HR1 forms the serial connection relation, dropping resistor R1 is made of high-power cement resistor, when power supply is given burner on light LED2 after dropping resistor R1 step-down, relay coil 32 provides drive current, heating gauge tap SK1, the second diode D2 forms heating gauge tap circuit, insulation indicator lamp LED1, first resistance R 4 is formed insulation indicating circuits 4 and is connected in parallel on the input 311 of normally opened contact 31 of relay and the two ends of output 312, preservation and controlling switch S K2, second resistance R 3 is formed preservation and controlling circuit 8, electrochemical capacitor EC1, Zener diode Z1 forms simple mu balanced circuit, thermostat K1 two ends one first diode D1 in parallel is in order to provide the insulation indicator lamp required electric current when thermostat K1 disconnects, heat retaining and exothermal plate HR2 is as heat insulation function, in order to prevent that unexpected overheated over-current phenomenon avoidance from taking place, present embodiment is in series with a protector FUSE1 at an end of main current supply circuit.
The course of work of present embodiment is: the out-put supply of present embodiment is civil power 220V, power supply is from mains supply line N, L two lines insert, relay coil drive circuit 5 forms the loop with main power supply circuits after pressing heater switch SK1, relay coil 32 has electric current to flow through, with the adhesive of relay switch shell fragment, thereby input of normally opened contact 31 311 and output 312 conductings, with main heating board HR1 power supply circuits become in parallel relation because of latching circuit 6 this moment, when main heating board HR1 switches on, to there be the part electric current to constitute the loop with relay coil simultaneously by relay normally open contact 31 and latching circuit 6, the magnetic field that electric current by relay coil produces is enough to guarantee that the input 311 of relay normally open contact 31 is kept with output 312 is connected, also promptly guaranteed the normal power supply of main heating board HR1, whether heater switch SK1 disconnects closure, do not influence the operate as normal of main heating board, electric cooker still is in heated condition, be relation in parallel because of insulation indicating circuit 4 with relay normally open contact 31 simultaneously, so insulation indicating circuit 4 no currents flow through, insulation indicator lamp LED1 is in and extinguishes state.Heat indicating circuit 2 because of directly connecting with relay coil 32 this moment, so burner on light LED2 has electric current to flow through, is in normal bright state.When the fast evaporation of moisture content in the rice with electric cooker is done, pot courage bottom temp can quicken to rise, when its temperature value is OFF point temperature value greater than the disconnection of the thermostat K1 of temperature limiter 1 inside, thermostat K1 will be in off-state, this moment, relay normally open contact 31 was in off-state with the drive current of block system relay coil 32, and heating refers to that lamp LED2 goes out, insulation indicator lamp LED1 changes Chang Liang over to, cooks and finishes.In order to obtain a good effect of cooking, the thermostat K1 operating temperature in the temperature limiter 1, OFF point Controllable Temperature is between 115～150 ℃, and ON point temperature can be selected a suitable temperature value.
See shown in the accompanying drawing 5, other parts are with embodiment 1 in this example, different is to be serially connected with to drive triode Q1 in relay coil 32 branch roads, preservation and controlling circuit 8 is formed in parallel by the SK2 and second resistance R 3, the 3rd resistance R 5 becomes relation in parallel with preservation and controlling on-off circuit SK2, second resistance R, 3 series connection backs with relay coil 32 branch roads, the B utmost point that wherein drives triode Q1 is connected between the 3rd resistance R 5 and the preservation and controlling circuit 8.
The embodiment of the above is preferred embodiment of the present utility model only, is not to limit practical range of the present utility model with this, so the equivalence that all shapes according to the utility model, structure and principle are done changes, all should be covered by in the protection domain of the present utility model.