CN2324539Y

CN2324539Y - Timing and constant temperature alarming device

Info

Publication number: CN2324539Y
Application number: CN 98230160
Authority: CN
Inventors: 赵少波
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-02-13
Filing date: 1998-02-13
Publication date: 1999-06-16
Anticipated expiration: 2008-02-13

Abstract

The utility model relates to a temperature-fixing and timing alarming device, which solves the automatic timing alarm in the process of cooking with a traditional cooker and the automatic alarm under other similar conditions. Switches of a time base circuit, a display circuit, a timing circuit, and a buzzer circuit are controlled respectively by inputting to a comparison circuit by a temperature detecting circuit and outputting by the comparison circuit. Various frequency signals which are generated by the time base circuit are transmitted to the timing circuit and the buzzer circuit, and are outputted to the display circuit by the timing circuit. Various frequency pulse signals are controlled by the buzzer circuit by receiving the signals of the comparison circuit and the timing circuit to modulate and synthesize alarm signals with different tones for driving a buzzer. The temperature-fixing and timing alarming device has the advantages of convenient operation and realization of cooker selection and manual-automatic selection of the cookers. The temperature-fixing and timing alarming device is a comparatively ideal alarming device for household cookers.

Description

The constant temperature timing warner

The utility model relates to a kind of constant temperature timing warner, particularly a kind of energy constant temperature alarm regularly.

We steam on the stove in kitchen, cooking food, and such two kinds of situations are arranged: the one, forgotten the food of boiling on the stove, and cause water to dryout or food burnt; Especially when boiling water, gas fire might be drenched after boiling and go out, bring certain accident potential with cooking food; When the strict grasp of the time requirement of using pressure cooker and boiling, it is more outstanding that this problem just seems, another kind of situation is to worry the generation of above-mentioned situation, have to often go to watch in boiling during this period of time.Above problem, has obtained solving preferably as micro-wave oven, electric cooker etc. for modern kitchen tools, but for traditional cooker, except constantly noting water that burns on the stove or the food that boils, does not have good solution at present basically.

The utility model purpose is to provide a kind of good looking appearance, and is firm solid, easy to use, has the automatic warning of arrival assigned temperature and starts relative timer automatically, and the arrival timing moment is the alarm of automatic warning once more.

The utility model is realized with following mode: the constant temperature timing warner is to constitute testing circuit 10 by sensor TS through amplifier A1 amplification output to export comparator circuit 12 to; Comparator circuit 12 is by reference power source IC12 and connect potentiometer and divide crimping comparer A2 to constitute; Control time base circuit 14, display circuit 18, timing circuit 17, buzz circuit 13 respectively from comparator circuit 12 output signals; Time base circuit 14 is made of frequency divider IC1 and double D trigger IC2a.The pps pulse per second signal that it produces exports the branch pulse shaping circuit 15 that is made of counter IC4 and IC5 to carry out exporting 1 minute time-base signal to timing circuit 17 behind 60 frequency divisions; Four kinds of frequency pulse signals of time base circuit 14 output constitute to display circuit 18, buzz circuit 13 respectively and show common signals and form various tone buzzerphones; Timing circuit 17 is made of counter IC6 and IC7 and BCD digital switch; Export decoding/driver IC 8 and the IC9 and the LCD LCD of display circuit 18 to by timing circuit 17; Buzz circuit 13 is produced pulse signal and is exported the alerting signal driving hummer BZ that the control Sheffer stroke gate receives the synthetic not same tone of frequency pulse signal modulation of time base circuit 14 by the signal that trigger IC3a and IC3b receive comparator circuit 12 and timing circuit 17 outputs respectively.Be connected to photoelectricity on the trigger IC3b output terminal and close device IC10 output control burning things which may cause a fire disaster.The potentiometer of comparator circuit 12 has two, is connected to comparer A2 input end through switch K1, and timing circuit 17 connects the output terminal of power supply and comparator circuit 12 respectively through switch K2.

The advantage of the utility model constant temperature timing warner is: owing to adopt temperature sensor directly to measure the temperature of cooker, in conjunction with selecting suitable temperature reference, can realize that water temperature arrives the critical preceding warning that boils in the cooker, stop gas fire to be extinguished because of water overflows, the accident potential that causes inflammable gas to leak, automatically start a timer owing to boil the back at water, both can guarantee that food processed desired quality, allow the operator save the trouble that constantly will worry about again, but energy savings also simultaneously, owing to the constant temperature timing warner can be arranged to manually actuated alarm, can be satisfied with and be not suitable for starting with temperature control, and the occasion that needs relative timing to report to the police, owing to adopt the structure that is placed on the cooker caping flexibly and adopt digital switch timing value input method, making use of the present invention very flexible, is a desirable constant temperature timing warner in fact, has solved very big inconvenience in the daily life.

Fig. 1 is a circuit block diagram of the present utility model

Fig. 2 is circuit theory diagrams of the present utility model

Fig. 3 is one of organization plan synoptic diagram of the present utility model

Fig. 4 is two of an organization plan synoptic diagram of the present utility model

Below in conjunction with accompanying drawing the utility model is further described in detail:

As shown in Figure 3 and Figure 4, the utility model is by at the bottom of being contained in the alarm feet, the temperature sensor TS and the timing warner box 20 interior circuit that touch the testing circuit 10 of cooker cover end face constitute, BCD digital switch by timing circuit 17, the time that boiling is continued in the boiled back of water in the predetermined container is inserted control circuit, show the time of being inserted by display circuit 18, according to using the cooker type, select suitable reference temperature by comparator circuit 12, then alarm box 20 or sensing TS are placed on the cooker top, because the temperature in the cooker is elevated to water when boiled, the temperature of cooker cover also is elevated to certain altitude continuously, temperature sensor TS records the temperature of container cover in real time, when the temperature that measures caping surpasses selected reference value, comparator circuit 12 sends water and opens signal, make buzz circuit 13 send the long chimes of doom at interval of low frequency, allowing simultaneously to be entered by the branch clock that time base circuit 14 and minute pulse shaping circuit 15 produce can prefabricated timing circuit 17, the remaining time after the display circuit 18 real-time Displaying timer time decreased, when arriving regularly the moment, timing circuit 17 control buzz circuits 13 send upper frequency, closeer at interval, long-term chimes of doom, when the operator removes cooker or alarm is taken down from the cooker caping from thermal source after, the temperature value that sensor arrives will descend, after the reference value that is lower than setting, entire circuit is returned initial duty, this external configuring after the timing value, by in the timing circuit 17 automatically/manually start switch K2, can manually boot timing circuit 17, after regularly arriving constantly, the signal that will give the alarm is finished a relative timer function.

Testing circuit 10 is made up of temperature sensor TS (nickel chromium triangle thermopair) and amplifier A1 (1/4LM324 four-operational amplifier) etc. as shown in Figure 1 and Figure 2; when temperature sensor TS places thermal source (on cooker cover); its output voltage is proportional to heat source temperature; this voltage outputs to the end of oppisite phase of the delayed type comparer A2 (1/4LM324) of comparator circuit 12 after amplifier A1 in-phase proportion amplifies; make comparisons with reference voltage; wherein resistance R 3, W3 determine enlargement factor; diode D1, D2 are the input protection diode, and C3 is a noise condenser.

Comparator circuit 12, form by R6, IC12 (LM336 reference power source), potentiometer W1, W2, comparer A2 and K switch 1, the stable reference voltage that integrated regulator IC12 forms is carried to potentiometer W1, W2, the equivalence output of the pairing sensor TS of caping temperature after amplifying when wherein W1 selects the interior water of common non-pressure cooker boiled.The TS equivalence output of caping temperature that just begun to steam of W2 selection pressure pot reduction valve.When K switch 1 is connected a, i.e. selection pressure pot is added to the end of oppisite phase of amplifier A2 with the output of W1, when K1 connects b, promptly selects common cooker, the reference value of output W2.

The amplifier A2 of comparator circuit 12 makes comparisons the reference value of temperature sensor TS real-time measurement values and selection, and when instantaneous value was lower than reference value, comparer A2 output is low to flatten, and subsequent conditioning circuit is failure to actuate.When measured value during greater than reference value, comparer A2 exports high level, starts the subsequent conditioning circuit action.R4 is a comparer A2 input end protective resistance, and capacitor C 1 is a filter capacitor.Connect the C end when manually starting automatic startup timer selection K switch 2, promptly be in automatic starting state, then the low level upset high level signal of comparer A2 output is added to following four circuit, time base circuit 14, display circuit 18, timing circuit 17 and buzz circuit 13 its contactors of control.Wherein one the tunnel be added to the 1 second time-base signal of two input nand gate B1 (B1-B4 is 1/4CD4011) permission B1 output from time base circuit 14 Calais.Another road is added to two input nand gate B2, and 1/64 second the oscillator signal that allows time base circuit 14 to export is added to the radix point display of the LCD LCD2 of display circuit 18 after B2 is anti-phase, and radix point is shown, shows that timing circuit 17 is activated.IC3a (1/2CD4538 is two can the to trigger monostalbe trigger again) monopulse that Third Road is added to buzz circuit 13 forms the just triggering input end of circuit, and the positive pulse signal of 10 seconds width of IC3a output is added to and door B5 (B5, B6 are 1/3CD4073).Allow the 512Hz low frequency signal of B5 output by signal modulation in 1 second of time base circuit 14 outputs, be added to phase inverter B4 and buzz circuit BZ through D3 (D3, D4 are IN4148 transwitch diode), make BZ send long low frequency sound equipment at interval, remind user's water boiled.The four tunnel output is added to 1 pin of IC6, IC7 (CD4029BCD decade counter) after Sheffer stroke gate B3 is anti-phase, will subtract gauge IC6, IC7 and change over to and subtract count status by putting number state.When K switch 2 is connected the d end, directly high level is added to foregoing circuit, promptly manually start timer, above-mentioned four tunnel outputs are identical.The unsettled problem of cmos circuit input end that R5 in the circuit produces when being used to prevent the switch switching, C2 is a filter capacitor.

Time base circuit 14 is made of IC1 (CD4060B14 level frequency divider) and IC2a (1/2CD4013 double D trigger).Wherein constitute crystal oscillator by 10 pin of Cs, Ct, Rs, Rt and crystal CRY and IC1 and the phase inverter in 11 pin, produce the standard signal of 32768Hz, signal from output 64,512 of various level modulus frequency divider and 1024Hz, be added to buzz circuit 13 respectively and form the buzzerphone of various tones and display circuit 18 common signal as the LCD LCD, after behind 14 grades of frequency divisions from 1/2 second time-base signal of 3 pin output.This signal one tunnel is added to buzz circuit 13.Another road is added to IC2a, and 1 pulse signal of exporting from 1 pin of IC2a is added to B1, owing to comparator circuit 12 Calais's high level signal, so the exportable pps pulse per second signal of B1 forms circuit 15 to sectors.

Divide pulse shaping circuit 15 to constitute by IC4 and IC5, be the CD4017 decade counter, wherein IC5 is connected into 6 systems, so 1 pin of IC5 output essence is that 60 frequency divisions are carried out in the pulse per second (PPS) that 14 pin of IC4 are imported, so it is output as 1 minute time-base signal, is added to timing circuit 17.

Timing circuit 17 is by IC6 and IC7 (being the CD4029BCD decade counter), constitute, all be connected into the decimal subtract counter, common 99 down counters of forming, the temperature that records as sensor TS is lower than the setting reference temperature, when comparer A2 is output as low level, B3 output high level is added to IC6,71 pin, it is in puts number state, this moment is according to the time of cooking needs, by pressing two BCD digital switchs (BCD1,2) of timing circuit 17, select 1-99 minute predetermined timing value.These two binary-coded decimals will directly be added to display circuit 18 by IC6, IC7 and show, but the round dot in the lower right corner does not show at this moment, and this moment is inserted state for timing in expression.When the temperature that records as TS is higher than reference temperature value, or when manually booting timer by K2, the B3 output switching activity is a low level, make IC6, IC7 enters count status, along with 15 outputs of minute pulse shaping circuit divide pulse, IC6, two decimal subtract counters that IC7 constitutes make to subtract counting, and its state value shows in real time by display circuit 18, up to being reduced to zero, when timing circuit 17 reduces to zero, be carved into during the expression timing, the 7 pin output of IC6 becomes low level by high level, is added to 11 pin of the IC3b of buzz circuit 13, IC3b is set as the monopulse formation circuit that negative edge triggers, produce 20 seconds wide timing pips,, produce than high-pitched tone (1024Hz) by opening the similar processing of circuit of alerting signal to water, more rapid chimes of doom reminds user's food cooked.After timing arrives, because down counter is 99 circulation down counters, displayed value will down subtract since 99 again this moment.

Display circuit 18 is made of IC8,9 (CD4543 liquid crystal display decoding/driver) and two LCD LCD1,2, make the common port signal of LCD from the 64Hz signal of the 13 pin Calais of the IC1 of time base circuit 14, display circuit 18 shows the excess time of timing circuit 17 in real time, when wherein the dot in the lower right corner shows, show that circuit has entered definition status.

Buzz circuit 13 is by hummer BZ, Sheffer stroke gate B4-B6, D3-D4, formation such as IC3a and IC3b, produce the timing pip of different in width respectively by IC3a, IC3b, with R7 two tunnel alerting signals are synthesized into one tunnel alerting signal by D3-D4 at last, drive the chimes of doom that hummer BZ forms to be needed by B4.In order manually to stop chimes of doom, to press AN and two timing pips can be formed circuit reset, hummer stops to pipe immediately.Photoelectrical coupler IC10 and resistance R 8 constitute the control signal light-coupled isolation output circuit after regularly arriving constantly, are used to expand the function of this timer and the automatic control that the solenoid valve cooperation can realize thermal source.CX1 in the circuit (CX2) and RX1 (RX2) are the monopulse timing element, and R9 is the pull-up resistor of reset terminal.

Figure 3 shows that a kind of integral structure of the present utility model, structure is compact, easy to use, durable.But because integral body is positioned on the cooker cover, environment temperature is higher, circuit component and provision for thermal insulation is required height, so cost is higher.Figure 4 shows that circuit and sensor isolating construction, only sensor is placed on the cooker caping, link to each other with control circuit by high temperature wire, low to circuit requirement, be easy to processing, and realize control easily thermal source.

The utility model constant temperature timing warner, can realize timing process time of traditional cooker easily, both can guarantee the quality of food processing, save the energy again, making relieved, the use easily of people's energy when using traditional cooker simultaneously, is a kind of desirable small household electrical appliance.

Claims

1. a constant temperature timing warner is characterized in that constituting testing circuit (10) by sensor TS through amplifier A1 amplification output exports comparator circuit (12) to; Comparator circuit (12) is by reference power source IC12 and connect potentiometer and divide crimping comparer A2 to constitute; Control time base circuit (14), display circuit (18), timing circuit (17), buzz circuit (13) respectively from comparator circuit (12) output signal; Time base circuit (14) is made of frequency divider IC1 and double D trigger IC2a, and the pps pulse per second signal that it produces inputs to the branch pulse shaping circuit (15) that is made of counter IC4 and IC5 to carry out exporting 1 minute time-base signal to timing circuit (17) behind 60 frequency divisions; Four kinds of frequency pulse signals of time base circuit (14) output are respectively to display circuit (18) and buzz circuit (13) formation demonstration common signal and the various tone buzzerphones of formation; Timing circuit (17) is made of counter IC6 and IC7 and BCD digital switch; Export decoding/driver IC 8 and the IC9 and the LCD LCD of display circuit (18) to by timing circuit (17); Buzz circuit (13) is produced pulse signal and is exported the alerting signal driving hummer BZ that the control Sheffer stroke gate receives the synthetic not same tone of time base circuit (14) frequency pulse signal modulation by the signal that trigger IC3a and IC3b receive comparator circuit (12) and timing circuit (17) output respectively.

2. according to the described constant temperature timing warner of claim 1, it is characterized in that being connected on the trigger IC3b output terminal photoelectrical coupler IC10 output control burning things which may cause a fire disaster.

3. according to the described constant temperature timing warner of claim 1, the potentiometer that it is characterized in that comparator circuit (12) has two, be connected to comparer A2 input end through switch K1, timing circuit (17) connects the output terminal of power supply and comparator circuit (12) respectively through switch K2.