CN2205687Y - Electronic rice pot - Google Patents

Abstract

The utility model relates to an electronic rice pot comprising a pot lid, an inner pot, an outer casing, a heating disc and an electronic temperature controller. A germanium transistor in the electronic temperature controller is used as a temperature-sensing element to be arranged on the bottom of the inner pot of the electronic rice pot. Besides, the utility model has all the functions of the common magnetic steel temperature controlled electronic rice pot, the functions of boiling water, decocting gruel and heat preservation can be added by selecting a switch, and the utility model sends out music alarm indication when the electronic rice pot is changed from one state to another state; so, rice can be boiled and not burnt, and water is boiled and does not overflow.

Description

Electronic rice pot

A kind of electronics electric cooker relates to the improvement of electronics electric cooker temperature controller.

Existing common heat preserving type automatic electric rice cooker is to adopt magnetic steel temperature limiter and bimetal leaf to make temperature controller, all there is such shortcoming in these electric cookers: at first be that magnetic steel temperature limiter is poor to sense temperature control, the general error that has 103 ℃ ± 2 ℃, that have even error is bigger, so be easier to meal is boiled soft or the meal of bottom is burnt; Secondly if when heating up water (or soup) with pot, after in case water is boiled, water temperature can not reach 103 ℃ of Curie points that make magnetic steel temperature limiter action, and therefore, the magnet steel temperature controller can not make the water fluidized state change keeping warm mode over to, can only continue heating, this just overflows outside the pot water easily, causes electric leakage, if user's carelessness slightly, do not have timely powered-down, poach will be done; In addition, in high area above sea level,, just overcook rice easily if still cook by the curie point of magnet steel because boiling temperature is low.

The purpose of this utility model is to provide a kind of electronics electric cooker that can overcome above-mentioned shortcoming, promptly to use the high temperature controller of a kind of temperature-sensitive temperature measurement accuracy instead, in addition, on the basis that increases product cost hardly, increase by a component and press network, expand and perfect to boil water and pot congee, the Baoshang function of electric cooker, and increase and a kind ofly open when changing keeping warm mode over to automatically or boil the cue circuit that can send one section music when changing keeping warm mode over to automatically when meal when poach.

The utility model is to implement like this: in the electronics electric cooker of being made up of pot cover 1, interior pot 2, shell 3, electronic temperature controller 4, temperature-sensing probe 5, spring 6 and heat-generating disc RW7, the bottom of interior pot 2 contacts with the top of heat-generating disc RW7, pot 2 bottom center in temperature-sensing probe 5 is placed by spring 6 supportings, electronic temperature controller 4 is installed on the shell 3, and wherein the electronics electric cooker said of the utility model is to adopt germanium transistor BG1 as the temperature-sensing element in the temperature-sensing probe 5.

Below in conjunction with accompanying drawing in detail structure of the present utility model and use are described in detail.

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the circuit diagram of electronic temperature controller described in the utility model;

Fig. 3 is the functional block diagram of the master element IC1 in the said electronic temperature controller of the utility model.

As shown in Figure 1, the utility model is made up of pot cover 1, interior pot 2, shell 3, electronic temperature controller 4, temperature-sensing probe 5, spring 6 and heat-generating disc RW7, wherein, germanium transistor BG1 is housed as temperature-sensing element in the temperature-sensing probe 5, the bottom of interior pot 2 contacts with the top of heat-generating disc RW7, pot 2 bottom center in temperature-sensing probe 5 is placed by spring 6 supportings, electronic temperature controller 4 is installed on the shell 3, wherein draws on the temperature-sensing element germanium transistor BG1 that lead is connected to temperature-sensing probe 5 from temperature controller 4.

As shown in Figure 2, electronic temperature controller 4 of the present utility model is master element (as NE555) by time-base integrated circuit IC1, between the reset trigger end (being 6 pin of IC1) of IC1 and power positive end (8 pin), insert the germanium transistor BG1 in the temperature-sensing probe 5, base stage, the colelctor electrode of BG1 are connected on the power positive end (8 pin) of IC1 together, the emitter stage of BG1 is oppositely received on the reset trigger end (6 pin) of IC1 by D1, D2 series connection; In addition, between the set trigger end (2 pin) and reset trigger end (6 pin) of master element IC1, insert pressure limiting diode D3, the D4 of the holding temperature scope of restriction soak, wherein the positive pole of D3 is connected on the reset trigger end, and the negative pole of D4 inserts the set trigger end of IC1.Insert respectively by R1, RV1 by selector switch AN1, R2, RV2, R3, RV3 form cooks, the upper end of to boil water and soak functional network, lower end at cook network R1, RV1 and network R2 to boil water, RV2 is linked into the power supply negative terminal (1 pin) of master element IC1 by switching diode D5 and complementary bistable switch BG2, BG3, and the lower end of soak network R3, RV3 and common insulation network R4, RV4 is directly arrived on the power supply negative terminal of IC1 (1 pin).

As shown in Figure 2, in the electronic temperature controller 4 of the said electronics electric cooker of the utility model, also be connected to the music tip circuit of forming by music integrated circuit IC2 and buzzer SPK, wherein, the discharge output (7 pin) of the master element IC1 of temperature controller 4 through the emitter stage of the BG3 of complementary bistable switch and trigger capacitor C 2 and insert music integrated circuit IC2(such as KD-152K) the triggering input, between the audio frequency output two ends of IC2, insert buzzer SPK.

Temperature controller 4 is made up of power supply, temperature-control circuit and heater circuit, at first, power supply is through connector CP place in circuit with civil power, the normally-closed contact of overheating fuse BX and relay J of leading up to is received heat-generating disc RW7 two ends, the relay indicating light RD of heat-generating disc RW7 and the two ends that are attempted by heat-generating disc RW7 after current-limiting resistance R13 is connected in series, insulation indicator lamp YE and be attempted by the normally-closed contact two ends of relay J after current-limiting resistance R12 connects.Another Lu Zejing transformer B1 adjusts the direct current regulation circuit that the molten C4 of triode BG5, resistance R 11 and filtered electrical forms by commutation diode D9, filter capacitor C5, Zener diode D8, power supply, introduce the power positive end (8 pin) of master element IC1 from the emitter stage of BG5, be added to the power positive end of music integrated circuit IC2 again by current-limiting resistance R10.Secondly, temperature-control circuit is a master element with time-base integrated circuit IC1, germanium crystal BG1 as temperature-sensitive temperature measurement controller part, receive interior pot 2 bottoms of electric cooker and carry out the temperature sampling, the base of germanium transistor BG1, the collection utmost point is also received the power positive end (8 of IC1,4 pin) on, the emitter stage of BG1 and the pressure limiting diode D1 that limits BG1 temperature-sensitive excursion, the D2 differential concatenation, receive on the reset trigger end (6 pin) of IC1, while D2 and D3, the D4 serial connection, the positive pole of D3 is also inserted the reset trigger end (6 pin) of IC1, and the negative pole of D4 inserts on the set trigger end (2 pin) of IC1.Two swing arm end AN1-1 of DPTT double-pole triple throw switch AN1, AN1-2 all joins with the set trigger end (2 pin) of IC1, the resistor network of respectively corresponding three difference in functionalitys on three gears of this switch: a point is R1, RV1, the b point is R2, RV2, the c point is R3, RV3, R1 wherein, RV1 and R2, the lower end of RV2 network is all by switching diode D5 and complementary bistable switch BG2, BG3 inserts the power supply negative terminal (1 pin) of master element IC1, R3, the power supply negative terminal (1 pin) of IC1 is then directly inserted in the lower end of the soak network of RV3, and the R4 of common insulation network, RV4 directly is connected between the set trigger end (2 pin) and power supply negative terminal (1 pin) of IC1.In the complementary bistable switch of forming by BG2, BG3, the shunt resistance R6 and the anti-interference capacitor C1 that are connect between shunt resistance R8 that BG3 base one emitter-base bandgap grading is connect and BG2 base one emitter-base bandgap grading, it is the element that is used to stablize the work of this complementary bistable switch, wherein the base stage of BG2 is received the discharge end (7 pin) of IC1, and emitter stage then inserts the power supply negative terminal (1 pin) of IC1.The emitter stage of BG3 then is connected with switching diode D5.In this temperature-control circuit 4, also inserting 4, often to open microswitch: AN2-1 be to boil water or the insulation starting switch of cooking, and is connected on the discharge end (7 pin) of IC1 and the negative terminal of voltage-stabilized power supply; AN2-2 is the music shutdown switch, is connected between the power positive end of the discharge end (7 pin) of IC1 and IC2; AN3-1 is the heating starting switch, is connected between the emitter stage of the discharge end (7 pin) of IC1 and BG3; AN3-2 is a strong starting switch to boil water, is serially connected in by current-limiting resistance R5 between the emitter stage of the set trigger end (2 pin) of IC1 and BG3.R7 connects between the reference voltage control end (5 pin) of voltage-stabilized power supply anode and IC1, as the divider resistance of determining IC1 internal reference voltage.The signal output part of IC1 (3 pin) is then received the base stage of switch triode BG4; receive an end of relay J coil by emitter stage; the anode of another termination power of relay coil, protection diode D6 is attempted by the coil two ends of relay J, with the operate as normal of protection coil.The indicator lamp ZD that connects with current-limiting resistance R9 is the status indicator lamp to boil water of cooking, and is connected between the emitter stage and voltage-stabilized power supply anode of BG3.

Two swing arm AN1-1 as functional select switch AN1, when AN1-2 places the A-a position respectively, by R1, the network of cooking that RV1 forms is access in master element IC1, as long as after power supply inserted civil power, heat-generating disc RW7 promptly enters duty, indicator lamp RD is bright, at this moment if do not press heating starting switch AN3-1, complementary bistable switch BG2, BG3 then is in cut-off state, diode D5 is that reverse bias also is by shape, the network of cooking still is disconnected, the electronics electric cooker only maintains by R4, the common insulation network work that RV4 forms, heat-generating disc RW7 can not be upgraded to high temperature.

After pressing the AN3-1 starting switch, because temperature-sensing element germanium transistor BG1 oppositely ends and R1, the dividing potential drop effect of RV1, the set trigger end of master element IC1 (2 pin) is low set triggering level, the output of IC1 (3 pin) is a high level, owing to heating starting switch AN3-1 short circuit triggers the complementary bistable switch conduction, make the conducting of switching diode D5 positive bias, R1, the RV1 network just inserts between the power supply negative terminal (1 pin) and set trigger end (2 pin) of IC1 by D5 and complementary bistable switch, like this, cook network just and R4, the common insulation network of RV4 has also connect, and this moment, the ZD lamp was bright, the RD lamp is bright, and the YE lamp goes out.Because IC1 output (3 pin) is a high level, thus cutoff switch pipe BG4, relay J is failure to actuate, and heat-generating disc RW7 continues heating power rises the temperature of pot 2 in the electronics electric cooker.When interior pot 2 bottom center temperature reach 103 ℃, the reset trigger end of IC1 (6 pin) is upgraded to high reset trigger level, making the output (3 pin) of IC1 is low level by hypermutation, BG4 is subjected to bias current and conducting makes the relay J coil electricity, the swing arm action, disconnect normally-closed contact, cut off the power supply of heat-generating disc RW7, the RD lamp goes out, and YE is bright for the insulation indicator lamp.Simultaneously, the discharge end of IC1 (7 pin) transfers short-circuit condition with power supply negative terminal (1 pin) to by open-circuit condition, make the complementary bistable switch by turn-offing, the anti-Pianguan County of D5 disconnected cook network R1, RV1 change the insulation network automatically over to, enter the heat insulation work state, simultaneously, ZD extinguishes, and the C2 charging triggers music integrated circuit IC2 and sends one section prompting music, and the process of cooking is finished in expression.

Along with interior pot temperature descends, the leakage current of temperature-sensitive germanium transistor BG1 also reduces thereupon, master element IC1 set trigger end (2 pin) current potential descends thereupon, and when the bottom of a pan central authorities temperature was reduced to 60 ℃, IC1 set went out the trigger end potential drop and is low to moderate the set triggering level, make the output (3 pin) of IC1 become high level from low level again, BG4 ends, and closed relay J makes the normally-closed contact closure, connect the power supply of heat-generating disc RW7, heat-generating disc RW7 can continue again to have heated to electric cooker.The bright again expression heat-generating disc work of RD lamp this moment, heat-generating disc RW7 is heated once more, the leakage current of temperature-sensitive germanium transistor BG1 increases again thereupon, the current potential of IC1 reset trigger end (6 pin) rises, when interior pot 2 bottom center temperature reach 80 ℃, the reset trigger end of IC1 (6 pin) current potential rises to the reset trigger level, make IC1 control output end (3 pin) become low level by high level, BG4 obtains bias current conducting once more, the coil motion of ordering about relay J disconnects its normally-closed contact, thereby heat-generating disc RW7 outage stopping heating, the RD lamp goes out simultaneously, and the YE lamp is bright.Under the situation of said process reciprocation cycle, electric cooker is to be incubated between 60-80 ℃, Here it is common heat insulation work state.

When will be with the electronics electric cooker that the utility model is said to boil water, as long as selector switch AN1 is placed B, b point, master element IC1 is just the network insertion to boil water of R2, RV2, as long as press heating starting switch AN3-1 again, the complementary bistable switch conduction, switching diode D5 is in the positive bias conducting, R2, RV2 network just insert between 1,2 pin of IC1 by D5 and complementary bistable switch, like this, network to boil water is just with the common insulation network of R4, RV4 and connect, the indicator lamp ZD to boil water that cooks is bright, and electric cooker is in heated condition to boil water.When the temperature of interior pot 2 bottom center reaches 100 ℃, the reset trigger end of IC1 (6 pin) becomes high reset trigger level, make 1,7 pin of IC1 become short-circuit condition by original open-circuit condition, having ended complementary bistable switch BG2, BG3 makes D5 be in anti-cut-off state partially, thereby turn-offed lattice network to boil water, the only common insulation network work of remaining R4, RV4, simultaneously, because ending of complementary bistable switch, the ZD indicator lamp goes out, expression water is boiled, and simultaneously, the music tip circuit sends one section music tip.

When AN1-1, AN1-2 are placed C, c point simultaneously, owing to inserted D4, circuit has entered the soak network of R3, RV3, this moment, R3, RV3 network were in parallel with common insulation network R4, RV4, heating starting switch AN3-1 is inoperative, and this electronics electric cooker directly enters the warm-up mode of cooking congee.When water temperature reaches 100 ℃, because the electrical level rising of the reset trigger end (6 pin) of IC1 is to the reset trigger level, the output of IC1 (3 pin) becomes low level by high level, the BG4 conducting, make the relay J action disconnect normally-closed contact, the YE lamp is bright, the RD lamp goes out, heat-generating disc RW7 quits work, when the temperature of interior pot 2 drops to 90 ℃, owing to the pressure limiting diode D3 that is connected on the BG1 emitter stage, the D4 effect, the level of the reset trigger end (6 pin) of IC1 is reduced, the set trigger end of IC2 (2 pin) is triggered by low level, is directed at output (3 pin) and becomes high level, by the BG4 pipe, make the relay J action connect normally-closed contact, RD is bright, and the YE lamp goes out, and heat-generating disc is connected the power supply heating.Said process carries out repeatedly, and people are cooked congee and unlikely overflowing easily.

Owing in electronic temperature controller 4, be equipped with the music tip circuit, when complementary bistable switch be in by the time, the emitter voltage of BG3 raises, thereby charges to triggering capacitor C 2, trigger music integrated circuit IC2(such as KD-152K) work, play out one section prompting music.As long as press music shutdown switch AN2-2 this moment,, just can end sending of music the power supply short circuit of IC2 once.In addition, if in process to boil water, if press insulation switch AN2-1, heated condition then to boil water can be exchanged into common keeping warm mode immediately.

After entering common keeping warm mode in function to boil water, if think to reheat at short notice, then need press AN3-1, AN3-2 switch simultaneously, start complementary bistable switch BG2, BG3 conducting fast, electric cooker just can reenter heated condition to boil water.

When the said electronics electric cooker of this utility model of needs is put into high above sea level area when using, need only with the concrete parameter adjustment of cook network R1, RV1 to the time, can make temperature controller 4 operate as normal than high 3 ℃ of local water boiling point temperature.

Built-in function block diagram when accompanying drawing 3 is IC1 employing NE555, its truth table is as follows:

Set end S reset terminal R my the Q discharge end Q' of MR output that resets by force

<1/3Vcc * H H OFF

>1/3Vcc >2/3Vcc H L ON

* * L L ON

1/3Vcc＜2/3Vcc H maintains the original state

Adopted the said electronics electric cooker of the utility model, because cost increases little, but reach the purpose that improves control accuracy and enlarge the scope of application of electric cooker fully, add the temperature-sensitive precision height of germanium transistor BG1 in the time of 100 ℃, can make that rice is ripe and not burnt, boiling water boiling and unlikely excessive, when the state of hotting plate changes keeping warm mode over to, can send one section music tip, and, use applicable to the highlands of low boiling temperature by suitable adjustment to dividing potential drop sampling microwave network data.

Claims (4)

1, a kind of electronics electric cooker, form by pot cover (1), interior pot (2), shell (3), electronic temperature controller (4), temperature-sensing probe (5), spring (6) and heat-generating disc RW (7), the bottom that it is characterized in that said interior pot (2) contacts with the top of heat-generating disc (7), temperature-sensing probe (5) places interior pot (2) bottom center by spring (6) supporting, temperature-sensing element in the temperature-sensing probe (5) adopts germanium transistor BG1, and electronic temperature controller (4) is installed on the shell (3).

2, electronics electric cooker according to claim 1, it is characterized in that said electronic temperature controller (4) is is master element by time-base integrated circuit IC1, between the reset trigger end of IC1 and power positive end, insert the germanium transistor BG1 in the temperature-sensing probe (5), wherein, base, the collection utmost point of BG1 are attempted by on the power positive end of IC1, and the emitter stage of BG1 oppositely is concatenated on the reset trigger end of IC1 by D1, D2.

3, according to claim 1 or 2 said electronics electric cookers, it is characterized in that at the set trigger end of the master element IC1 of said electronics degree controller (4) and reset to make a start also inserting respectively by R1 by selector switch AN1, RV1, R2, RV2 and R3, it is to boil water that RV3 forms, cook and the upper end of soak functional network, the R1 of network wherein cooks, the R2 of RV1 and network to boil water, the lower end of RV2 is by switching diode D5 and complementary bistable switch BG2, BG3 inserts the power supply negative terminal of main controlling element IC1, and soak network R3, the lower end of RV3 then directly connects the power supply negative terminal of IC1.

4, according to the said electronics electric cooker of claim 1, it is characterized in that in described electronic temperature controller (4), to insert the music tip circuit of forming by music integrated circuit IC2 and buzzer SPK, wherein by the discharge output of the master element IC1 of electronic temperature controller (4) through the emitter stage of the BG3 of complementary bistable switch and trigger the triggering input that capacitor C 2 inserts music integrated circuit IC2, between the audio frequency output two ends of IC2, insert buzzer SPK.

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