CN2095450U - Timing double functional alarm for boiling - Google Patents

Abstract

The utility model discloses a timing double functional alarm for boiling, which is composed of a temperature sensor, a timing controlling circuit, an alarm circuit, an alarm element, a battery, a heat insulating layer, etc. which are arranged in a small plastic box, wherein, the temperature sensor is arranged on the bottom of the plastic box, and a part of the temperature sensor extends out a small hole on the bottom of the plastic box. The utility model is arranged on the metal cooker cover of an ordinary cooker, and the temperature sensor directly contacts the cooker cover. When a boiled object in the cooker boils, the timing double functional alarm for boiling beeps and emits an optical signal, and the timing double functional alarm for boiling automatically becomes a standby state by following temperature reduction after disassembled. The standby state which is normal is basically of no power consumption. After delaying time is set, and a timer starts, the timing double functional alarm for boiling emits an audible and an optical signals again by exceeding the set delaying time. The utility model which consumes power when the audible and optical signals are emitted is of low power consumption in the intermission periods of an audible and an optical pulses.

Description

Timing double functional alarm for boiling

The utility model belong to a kind of have can listen and the telltale of visible indication, especially be contained in the small plastic box and the pot that constitutes is opened, difunctional alarm regularly by temperature sensor, timing control circuit, warning circuit, alarm element, battery and heat insulation layer etc.

Application number is that 90222438.7 Chinese utility model has proposed the pot opening alarm device that can report quite correctly whether pot interior rice to be cooked seethes with excitement, and this alarm has individual shortcoming.Many foods could eat after also need hotting plate certain hour after the boiling, though open the back firepower of reporting to the police through adjusting at pot, if forget on the stove and burning thing, food still might be hotted plate excessive, even burnt.

Task of the present utility model provides that a kind of pot is opened, difunctional alarm regularly, it is placed on just can reports quite correctly on the metal pot cover whether a pot interior rice to be cooked seethes with excitement, promptly take off after the warning from pot cover, adjust firepower, setting-up time is restarted timing circuit, through reporting to the police once again after the time of user's setting, pot leaves report to the police part and timing alarm and partly can independently use in the difunctional alarm, also can join together to use together.

For solving above-mentioned task, the solution that the utility model adopts is: add a timing control circuit on the basis of pot opening alarm device again.Timing control circuit can be made of mimic channel or digital circuit, uses mimic channel fairly simple and cheap at present.In timing control circuit and the pot opening alarm device original warning circuit combination is arranged, constitute timing warner.The combination of pot opening alarm device and timing warner has two kinds: first kind of combination is that pot opening alarm device and timing warner work alone separately: difunctional alarm is as the pot opening alarm device, it is placed on the metal pot cover, pot leaves the back and reports to the police, after it is taken off from pot cover, toggle switch, the break-off signal sensor connects timing control circuit, becomes timing warner.Timing arrives, and alarm is reported to the police always, impels the user that switch is dialled and gets back to a pot opening alarm device duty.Because temperature sensor is cold, so the pot opening alarm device is in stand-by state, not power consumption substantially.Under second kind of combination, temperature sensor is connected on the circuit always, and at this moment the pot opening alarm device has two kinds of usages, and a kind of usage is that timing control circuit disconnects as the pot opening alarm device, and this usage is the same with first kind of combination effect; Another kind of usage is that timing control circuit also connects as the pot opening alarm device, and timer is set in a reasonable time, and alarm can be reported to the police usually in advance in this case, if can overflow after the food of the hotting plate boiling, adopts this usage better.It is taken off from pot cover, promptly become the timing warner duty, reset timing and start timing circuit, then through reporting to the police again behind the setting-up time.After timer is reported to the police,, just should disconnect timing control circuit, otherwise alerting signal do not stop, after the timing control circuit disconnection, because temperature sensor is cold, so enter a pot opening alarm device stand-by state, not power consumption substantially if do not need timing alarm again.

Since above-mentioned solution be to original pot of opening alarm device replenish and perfect, so it has kept pot all advantages that opening alarm device had, owing to increased timing control circuit, food can not take place again hot plate excessive.

Below in conjunction with drawings and Examples the utility model is described in further detail.

Fig. 1 (a) is a circuit block diagram of the present utility model, is two kinds of combinations of pot opening alarm device and timing warner (b) and (c).

Fig. 2 is a warning circuit, and alarm element and battery also draw on the figure.

Fig. 3 is various timing control circuits.

Fig. 4 is embodiment 1 electrical schematic diagram.

Fig. 5 is embodiment 2 electrical schematic diagrams.

Fig. 6 is embodiment 3 electrical schematic diagrams.

Fig. 7 is a structural representation.

Fig. 1 (a) circuit block diagram explanation, except that casing and heat insulation layer, the utility model is made up of five parts: primary power saves dry cells with two, and as if with the more expensive rechargeable battery of price, then every performance all has raising, but will pay special attention to during structural design.Temperature sensor is with a PN junction in germanium diode or the germanium triode.Alarm appliance is sound, two kinds of light, and the acoustic alarm device adopts piezo-electric ceramic sounding sheet, light crossing-signal spare light emitting diode.Warning circuit and timing control circuit provide in Fig. 2 and Fig. 3 respectively.Fig. 1 (b) and (c) two kinds of combinations of expression pot opening alarm device and timing warner.In Fig. 1 (b), switch makes progress at ordinary times, and temperature sensor is connected with warning circuit, becomes a pot opening alarm device; Switch is stirred downwards, and temperature sensor disconnects, and timing control circuit connects, and becomes a timing warner.In Fig. 1 (c), temperature sensor is connected on the warning circuit always, switch disconnects during as the pot opening alarm device, at this moment the same with afore-mentioned, if switch closes, set timing and start timing circuit, be placed on again on the metal pot cover, so the pot opening alarm device can be reported to the police in advance, this working method commonly used when hotting plate the food that can overflow after the boiling.

Fig. 2 is a warning circuit, and alarm appliance and battery have also drawn on the figure.The complementary multivibrator that is made of transistor BG1 and BG2 etc. removes to trigger an audio frequency oscillator that is made of BG3 etc. as the ultralow frequency pulse producer.Wherein R1 and W ₁Be below-center offset resistance, regulate W ₁Resistance can change the starting of oscillation threshold current of complementary multivibrator, thus the temperature of germanium diode can regulate pot opening alarm device and report to the police the time.The upper offset resistance that do not draw on the figure, it is made of field effect transistor and/or anti-inclined to one side germanium diode and current-limiting resistance.When field effect pipe source current and/or germanium diode inverse current met or exceeded the starting of oscillation threshold current of ultralow frequency pulse producer, warning circuit sent sound and light signal.C1 and R2 are feedback circuits, and R3 and LED are the loads of BG2.During the BG2 conducting, pulse occurs on R3 and the LED, pulse duration LED is luminous, and simultaneously it also is added on the base stage of BG3 by R4, thereby triggers the audio frequency oscillator starting of oscillation that is made of BG3 etc.L is the inductance that is connected in the BG3 emitter circuit, and C2 is a feedback capacity.As the telefault of audio frequency oscillator, it also raises audio oscillation voltage autotransformer B simultaneously, makes piezoelectric ceramic piece HTD send loud sound on the one hand, and E is a power supply.

Fig. 3 is a timing control circuit.Utilize the field effect transistor of Control of Voltage on the timing capacitor, by the source current triggering warning circuit work of field effect transistor.Fig. 3 (a) is with N channel junction field-effect pipe FET of simple RC timing circuit control, with N channel depletion type metal-oxide-semiconductor field effect transistor also can, wherein C is a timing capacitor.For field effect transistor FET is ended, be negative value with voltage on the capacitor C that grid links to each other, this negative voltage can be used reversing switch K ₂₂Obtain from the complete machine power-supply battery.R2 and W ₂Series connection constitutes the bleeder resistance of C.Bleeder resistance is big more, and it is slow more to discharge, and it is long more to delay time, so it is a timing resistor.The last negative voltage of C reduces with discharge, and the field effect transistor source current remains zero earlier, increases alarm equipment alarm up to greater than the starting of oscillation threshold current of complementary multivibrator the time then gradually.R1 is the current-limiting resistance of field effect transistor.Fig. 3 (b) and difference (a) are that voltage on the timing capacitor C is by an accessory power supply E ₂Supply with AN ₁It is pushbutton switch.Fig. 3 (c) is the circuit diagram with N channel enhancement metal-oxide-semiconductor field effect transistor, R2 and W ₂The series connection back is to timing capacitor C charging, K ₂₂' be 2 * 2 switches, R1 is a current-limiting resistance.Charging voltage obtains from the complete machine power-supply battery, certainly it also can be designed to obtain from accessory power supply, Fig. 3 (d) is stabilivolt D2 in parallel at timing capacitor C two ends, and the negative voltage on the timing capacitor is obtained after commutator tube D1 rectification by warning circuit sound intermediate frequency high pressure.R3 is a charging current limiter resistance, W ₂With R2 be timing resistor, R1 is the current-limiting resistance of field effect transistor FET.In Fig. 3 (e), timing capacitor C is from accessory power supply E ₂" on obtain voltage, BG ₄Constitute emitter follower, the voltage on the C is through the base loop discharge of emitter follower.Transistor BG ₄Collector voltage supply with by big capacitor C 2.Voltage on the C2 when alarm work the audio frequency high pressure from the autotransformer through commutator tube D ₁Obtain after the rectification.R3 is a charging current limiter resistance, R2 and W ₂Be timing resistor, AN ₃It is pushbutton switch.AN ₃When closing, obtain voltage on the timing capacitor C, if C2 goes up voltage when very low, accessory power supply also charges to C2.The characteristics of this circuit are to can be used as long time-delay, and the boosting battery power consumption is few.Fig. 3 (f) is the simplification circuit of Fig. 3 (e), because the timing circuit power consumption is little, thus also can be by intermediate battery supply, it also is to use under long-time time-delay situation.

Fig. 4 is the electrical schematic diagram of embodiment 1.Temperature sensor, timing control circuit and warning circuit can combine by Fig. 1 (b) mode, but the present embodiment picture is Fig. 1 (c) combination.As often being connected on the E and C point of warning circuit after the germanium diode D of temperature sensor and the current-limiting resistance R5 series connection.Timing control circuit can adopt Fig. 3 (a), (b) in arbitrary circuit, what present embodiment was drawn is the timing control circuit that Fig. 3 (b) provides, the voltage on the timing capacitor C is supplied with by boosting battery E2, by timing resistor R7 and W2 discharge.K switch disconnects at ordinary times.Complete machine is placed on the metal pot cover, and temperature sensor directly contacts with metal pot cover, and when thing in the pot seethed with excitement, the inverse current that flows through diode surpassed the starting of oscillation threshold current of the complementary multivibrator that is made of BG1 and BG2, and the oscillator starting of oscillation produces the ultralow frequency pulse.The ultralow frequency pulse is flashed LED, and simultaneously it triggers the audio frequency oscillator that is made of BG3 etc. through R4 again.Audio oscillation voltage sends interrupted beep sound through the autotransformer B pusher dynamic pressure electroceramics sounding sheet HTD that boosts.At this moment alarm should take off from pot cover.Along with temperature reduces, the germanium diode inverse current descends, and alarm quits work automatically.If require to report to the police again every a period of time, then can connect K switch, to regulate W2 and set timing, the source current that at this moment flows through field effect transistor FET is reported to the police warning circuit.Press AN ₁, field effect transistor is ended, and the voltage on timing capacitor descends because of discharge, and the source current that flows through in the field effect transistor surpasses the warning circuit starting oscillation current, and warning circuit is worked again.At this moment warning circuit is reported to the police always, just quits work up to cutting off K switch.Difunctional alarm also can be used as timer separately: as long as close K ₃Transfer the W2 setting-up time, press AN ₁Also can press AN earlier ₁, close K again, to do like this, alarm sounding light signal not when timing circuit starts is reported to the police after waiting timing to arrive again.Also having a kind of working method is that K is closed, and sets a suitable timing and starts, and is placed on to make pot on the metal pot cover and open warning usefulness again, and at this moment alarm can be reported to the police in advance.If it is can overflow after the thing boiling in the pot, better in this way.

Fig. 5 is the electrical schematic diagram of embodiment 2.The difference of it and Fig. 4 is that timing control circuit adopts circuit shown in Fig. 3 (d).K switch ₂₃Be a pot opening alarm device when being in position 1, when the pot opening alarm device was reported to the police, audio voltage was given regularly capacitor C charging by current-limiting resistance R7 after the D1 rectification.The last voltage of C can be too not high, and it is restricted by shunt regulator tube D2.K ₂₃Warning circuit alarm when being positioned at position 2, this position aim at C charging usefulness.When pot opening alarm device time of fire alarming fall short of or difunctional alarm directly when the timing warner, the last undertension of C is forbidden timing, so this state will be arranged.Work as K ₂₃Become timing warner when being positioned at position 3.Being connected in parallel on timing capacitor C again after timing resistor R6 and the W2 series connection goes up as bleeder resistance.When the voltage on the C dropped to a certain degree, field effect transistor FET source current surpassed the warning circuit starting oscillation current, triggered alarm equipment alarm.This circuit accessory power supply, complete machine is only used two batteries.

Fig. 6 is the electrical schematic diagram of embodiment 3.The difference of it and Fig. 4 is that timing control circuit adopts circuit shown in Fig. 3 (f).The circuit discharging of voltage on the timing capacitor by being made up of BG4 and timing resistor R7 and W2, this discharge process is very slow, thereby can obtain time-delay for a long time.

Adopt various timing circuit schemes that the utility model provides with Fig. 1 (b) with a mode (c) and the combination of pot opening alarm device, can constitute various forms of pots and open, the difunctional alarm of timing.

Fig. 7 is the utility model structural representation.Wherein D is the germanium diode as temperature sensor, and A is a heat insulation layer, prevents that the temperature of circuit board and battery is too high, and also can be designed to three-decker: bottom is temperature sensor and heat insulation layer, and circuit board is put in the centre, and battery is placed on top layer.

Claims (8)

1, a kind of alarm of being made up of plastic casing temperature sensor, warning circuit, alarm element, battery and heat insulation layer etc., it is characterized in that: it also has a timing control circuit, opens thereby constitute pot, regularly difunctional alarm.

2, by the described pot of claim 1 open, difunctional alarm regularly, it is characterized in that: timing control circuit is to be connected to timing capacitor by grid, the source electrode string is made up of the field effect transistor and the bleeder resistance of current-limiting resistance, the G end of the ground termination warning circuit of timing control circuit, current-limiting resistance is by switch circuit C end taking alarm, and circuit E end taking alarm drains.

3, by the described pot of claim 1 open, difunctional alarm regularly, it is characterized in that: timing control circuit is to be connected to timing capacitor by grid, the source electrode string is made up of the field effect transistor and the emitter follower of current-limiting resistance, the ground end of emitter follower and the ground end of timing capacitor link to each other, the grid of its transistorized base stage and timing capacitor and field effect transistor links to each other, the ground termination warning circuit G end of timing control circuit, current-limiting resistance are by switch circuit C end taking alarm, and circuit E end taking alarm drains.

4, by the described pot of claim 1 open, difunctional alarm regularly, it is characterized in that: timing control circuit is to be connected to timing capacitor by grid, the source electrode string is made up of the N channel enhancement metal-oxide-semiconductor field effect transistor and the charging resistor of current-limiting resistance, one end of charging resistor links to each other with the grid of timing capacitor and field effect transistor, the other end links to each other with power supply E by switch, the ground termination warning circuit G end of timing control circuit, current-limiting resistance are by switch circuit C end taking alarm, and circuit E end taking alarm drains.

5, by the described alarm of claim 2, it is characterized in that: timing capacitor meets double-point double-throw switch K 22, when K 22 is in position 1, and the positive termination power of timing constant volume, negativing ending grounding; When K 22 was in position 2, timing capacitor positive ending grounding, negative terminal connect fet gate and bleeder resistance.

6, by the described alarm of claim 2, it is characterized in that: be provided with accessory power supply E in the timing circuit ₂, E ₂Positive ending grounding, negative terminal meets pushbutton switch AN ₁, AN ₁The other end and the grid of timing capacitor, bleeder resistance and field effect transistor link to each other.

7, by the described alarm of claim 2, it is characterized in that: timing capacitor two ends stabilivolt D in parallel ₂, timing capacitor one end ground connection, the other end is connected on the DPTT double-pole triple throw K switch ₂₃A cutter on, K ₂₃When being in position 1, timing capacitor is by switch, through current-limiting resistance and commutation diode D ₁Be connected on the autotransformer B, warning circuit C holds through current-limiting resistance, by second half switch jointing temp sensor D, links to each other with warning circuit E end then; K ₂₃When being in position 2, the timing capacitor wiring is constant, and warning circuit C holds through current-limiting resistance, directly connects power supply by second half switch; K ₂₃When being in position 3, timing capacitor links to each other with fet gate and bleeder resistance by switch, and warning circuit C holds through current-limiting resistance, connects the source electrode of field effect transistor by second half switch.

8, by the described alarm of claim 3, it is characterized in that: be provided with accessory power supply E in the timing circuit ₂', E ₂' positive ending grounding, negative terminal meets emitter-follower transistor BG ₄Collector, BG ₄Emitter string timing resistor after ground connection, BG ₄Base stage connect the grid of timing capacitor and field effect transistor, pushbutton switch AN ₂Be connected on BG ₄Base stage and collector between.

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