CN2226760Y

CN2226760Y - Domestic self-warning device for water boiling

Info

Publication number: CN2226760Y
Application number: CN 94239387
Authority: CN
Inventors: 赵雨农
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-09-22
Filing date: 1994-09-22
Publication date: 1996-05-08
Anticipated expiration: 2004-09-22

Abstract

The utility model relates to a domestic self-warning device for water boiling, which is characterized in that a designed circuit comprises a ringing guarantee circuit in water boiling time that is composed of a photoresistor and a light emitting diode and comprises a boiling point regulating circuit that is composed of a trimming resistor and a light emitting diode. The ringing guarantee circuit as water boiling can automatically regulate ringing time in water boiling time when the supply voltage is in range of 2V to 3.5V and can assure ringing as soon as water is boiled. The boiling point regulating circuit, using the property that the boiling point is reduced when a resistor value is enlarged, regulate the resistor value to set up boiling points which are in coincidence the boiling points in actual air pressure to assure automatically ringing as soon as water is boiled.

Description

The service water self-warning device that boils

The utility model relates to a kind of warning device, particularly a kind of domestic electronic water warning device that boils.

The household utensils of selling on the domestic existing market of heating up water or cooking, when boiling, alarm free device all basically.So unless you give your whole attention to it, fuel will occur wasting, burn out kettle, even boiling water extinguishes the blaze and cause gas leak, and then cause human casualty accident.On the market a kind of mechanical type siren warning device is arranged now, its principle is to utilize water to open the air pressure that the back forms, and impacts the reed in this device, forces the siren sounding alarm, and it requires the periphery of the lid of utensil that gas leak phenomenon can not be arranged.The manufacturing cost of product is increased, use is restricted, just because of this device is to work through mechanical motion by certain gaseous tension, the size of gaseous tension is again by what of water, prosperous weak decision of stove fire, produced because of Hu Shui too many (or very little) or stove fire are not prosperous sometimes that water boils but air pressure is not enough, thereby siren does not pipe.So this technology is difficult to promote, only on the part kettle, use so far, and more the use field remains to be opened up, as insulating pot, electric cooker etc.Although at present industrial electron temperature sense device is a lot, because of the circuit structure complexity, technological requirement height (so cost is also high) can only be applicable to commercial production, and be unwell to family.About the boil device of warning aspect of electronics water, its temperature sensor is directly to contact with water mostly, exists problems such as sealing, installation, health from the technology of patent applied for.

The purpose of this utility model just provides a kind of stable performance, easy for operation, with low cost, " service water boil self-warning device " that be subjected to that vast family welcomes.

Essence of the present utility model is to ring circuit by the news of design, switch (conducting) circuit, select circuit, the temperature sensation circuit, water boils to ring and guarantees circuit during change in voltage, the organic whole that boiling point regulating circuit and power indicating circuit are formed, during work, by the on-off circuit energized, select circuit selection function (heat up water or cook), the temperature sensation electricity is trampled by temperature-sensitive head and is accepted working temperature, when low temperature, resistance is big, the base stage of triode is low-voltage, triode is cut-off state, the loudspeaker that news are rung circuit is sounding not, and when experiencing temperature and reach boiling point, resistance is little, the base stage of triode is high voltage, the triode conducting triggers driving loudspeaker sounding and pipes, and finishes water and boils from the ring action.

Below by a specific embodiment, further specify architectural feature of the present invention and principle of work and good effect.

Accompanying drawing 1 is the boil product structure figure of self-warning device of service water

Accompanying drawing 2 is the boil electronic-circuit diagram of self-warning device of service water

Sequence number among Fig. 1 is represented respectively: sound hole 1, pilot lamp 2, shell 3, selector switch 4, power switch 5, fixedly screw 6, trade mark 7, temperature-sensitive head plug-in unit 8, lead 9, limit plunger 10, temperature-sensitive head 11, bottom 12, bottom staple 13, battery 14, battery case 15, wiring board 16, wiring board holder 17, electronic component 18, loudspeaker sound chamber 19, loudspeaker 20.News are rung circuit by integrated circuit (IC), BG ₁, BG ₂Form with loudspeaker, wherein BG ₂Be used for volume and amplify BG ₁Be used for the work of integrated circuit (IC) self; IC is MT-802A integrated of the toot sound of muttering, triode BG ₁Be 3DG12, BG ₂Be 9015, Microspeaker is φ 29.8 Ω, 0.25W; Switch (conducting) circuit is by BG ₃Form with capacitor C, wherein capacitor C is used for anti-wave interference; Capacitor C is 0.1 (the ceramics type), BG ₃Be 3DG6; Select circuit by resistance R ₁, K switch ₁Form, connect K ₁For heating up water, newly open K ₁For cooking; R ₁Be 2K (semifixed resistor), K ₁It is 1 * 2 switch; The temperature sensation circuit is by thermo-sensitive resistor R ₅, photoresistance R ₂Form; R ₅Be 5.1K, R ₂20K when dark is 1.4K when bright; Water boils ring assurance circuit by photoresistance R during change in voltage ₂, luminotron LED ₁Form; R ₂Be 20K, LED ₁Be φ 5; The boiling point regulating circuit is by resistance ₃And LED ₁Form; R ₃Be the 3K semifixed resistor, in order to regulate LED ₁Brightness, make pipe a little consistent with actual boiling point; Power indicating circuit is by resistance R ₄, LED ₂Form, R is the metalfilmresistor of 200 Ω, 1/8W.

Using method is as follows, the pressing power switch 5 (K among Fig. 2 ₂Be in connected state), bright (the specifications and models φ 5LED of pilot lamp of pilot lamp ₂), the warning usefulness if the water of heating up water boils (is seen accompanying drawing 2, the selector switch K of this moment with the position that selector switch 4 is pulled when heating up water ₁Be on position), limit plunger 10 is filled in kettle Hu Zui, it is neighbouring Anywhere that self-warning device can be placed on the working position.If as long as the meal warning usefulness of boiling when cooking is will be by R ₁And K ₁Selector switch K in the selection circuit of forming ₁Pull opposite location, make K ₁Be in open position.

In order to guarantee the boil warning accuracy of self-warning device of service water, the leakage ring when anti-sealing boils, ring late and ring phenomenon earlier at a simmer, the water ring of boiling guaranteed circuit when the utility model had designed change in voltage, this guarantees that circuit is by photoresistance R ₂(20K), LED ₂(φ 5) are formed, and it can compensate the warning error that causes because of the supply voltage reduction automatically.The power supply of present embodiment is 2 joint 1.5V5 batteries, and the work that pipes when this circuit can guarantee that supply voltage all can be regulated water automatically and boils in 2～3.5V scope guarantees the water i.e. ring of boiling constantly.Voltage is higher sometimes for new packed battery, uses back voltage to reduce gradually again, but as long as can both guarantee the water i.e. ring of boiling in the differential pressure range of above-mentioned design.R ₂Value along with LED ₂By secretly brightening by big (20K) diminish (1.4).

In order to guarantee that the service water self-warning device that boils works under different atmospheric pressure environments, in this circuit, also designed the boiling point regulating circuit, promptly at photodiode LED ₁With the adjustable resistance R that connects between the temperature-sensitive head 11 ₃Because under different atmospheric pressures, its boiling point is different, as in the plains region, boiling point is 100 ℃, but the some places boiling point has only 80～90 ℃ in the highlands, if the ring point of self-warning device still at 100 ℃, then self-warning device pipes never in the highlands.Owing to designed the circuit of adjusting the water boiling point temperature, just solved this problem.As using this self-warning device, with adjustable resistance R in the highlands ₃Resistance heighten; As using this self-warning device, then with adjustable resistance R in the plains region ₃Resistance turn down, promptly utilize resistance value to increase the characteristic that boiling point reduces, by adjusting,, protect allowing water boil to ring certainly with boiling point and the different air pressure actual boiling point unanimity of setting down to resistance.

By thermo-sensitive resistor R ₅(5,1K), photoresistance R ₂(20K) form temperature sensation circuit (sensor), thermo-sensitive resistor R ₅In temperature-sensitive head 11, during use temperature-sensitive head 11 is inserted in the container of heat up water (or watering meal), when hanging down water temperature, thermistor R ₅Resistance is big, BG ₃Base stage (3DG6) is low pressure, BG ₃Be off-state, self-warning device is sounding not; When water temperature is increased to boiling point, thermo-sensitive resistor R ₅Resistance obviously descend BG ₃Base stage is high voltage, makes triode BG ₃Conducting triggers news and rings the integrator sounding.

News are rung circuit by IC (TM-802 mutter toot sound integrated), BG ₁, BG ₂, loudspeaker forms, BG wherein ₂Be used for volume and amplify BG ₁(3DG12) be used for self work.News after triggering are rung integrator again by BG ₂(9015) power amplification drives Microspeaker (φ 29.8 Ω, 0.25W) sounding, finishes water and boils from ring work.

Good effect of the present utility model: from as seen above-mentioned, behaviour of the present utility model All automatically control and regulate by electronic circuit, thus not only convenient but also accurate, both Reliably again stable, the ring point is not subjected to the impact of the water yield and firepower certainly, is not subjected to pot kettle big yet What the impact of little and water rice all can reach designing requirement, opens with the application's patent The product of sending out will be subjected to the welcome of vast family, in addition, and it is can also a thing many With, as a warming plug-in unit being pulled out (namely removing TEMP partly), connect again one Hand push button just becomes the calling set between doorbell or the concubine.

Claims

1, a kind of service water self-warning device that boils, it by news ring circuit, switch (conducting) circuit, the water ring of boiling guarantees that circuit, boiling point regulating circuit and power indicating circuit are formed when selecting circuit, temperature sensation circuit, change in voltage, it is characterized in that above-mentioned water boils i.e. ring assurance circuit by photoresistance R ₂And LED ₁Form, they link to each other with the boiling point regulating circuit with the temperature sensation circuit in circuit by lead respectively; Above-mentioned boiling point regulating circuit is by resistance R ₃And LED ₁Form, they are connected in the circuit mutually.

2, the service water according to claim 1 self-warning device that boils is characterized in that the water i.e. ring of boiling guarantees photoresistance R in the circuit ₂Resistance is 20K, LED ₁Specification be φ 5.

3, the service water according to claim 1 self-warning device that boils is characterized in that the resistance R in the boiling point regulating circuit ₃Be that a resistance is the semifixed resistor of 3K, it is connected on thermo-sensitive resistor R ₅And LED ₁Between.

4, the service water according to claim 1 self-warning device that boils; It is characterized in that interrogating and ring circuit by integrated circuit (IC), diode BG ₁, triode BG ₂Form with loudspeaker, IC is MT-802A integrated of the toot sound of muttering, BG ₁Model be 3DG12, BG ₂Model be 9015, loudspeaker is the Microspeaker of φ 29,8 Ω, 0.25W.

5, the service water according to claim 1 self-warning device that boils is characterized in that selecting the R in the circuit ₁Be that resistance is the semifixed resistor of 2K.

6, the service water according to claim 1 self-warning device that boils is characterized in that the thermo-sensitive resistor R in the temperature sensation circuit ₅, placing temperature-sensitive head 11, its resistance is 5.1K, photoresistance R ₂Resistance be 20K when dark, be 1.4K when bright.

7, the service water according to claim 1 self-warning device that boils, the resistance R in its power indicating circuit ₄Be that a model parameter is the metalfilmresistor of 200 Ω 1/8W, LED ₂Specification be φ 5.

8, the service water according to claim 1 self-warning device that boils is characterized in that capacitor C parameter in switch (conducting) circuit is 0.1 ceramics type electric capacity, triode BG ₃Specification be 3DG6.