CN2037089U

CN2037089U - Dual function electronic warner for water boiling and door bell

Info

Publication number: CN2037089U
Application number: CN 88216680
Authority: CN
Inventors: 王政军
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-07-02
Filing date: 1988-07-02
Publication date: 1989-05-03

Abstract

The utility model belongs to a signal device, in particular to a dual function electronic warner for water boiling and door bell, comprising a loudspeaker 2, a circuit board 3, a power supply 4, a wiring terminal 5, a wiring terminal 6, a temperature sensing probe 7 and a button switch 8 which are arranged in a housing 1. The utility model has simple structure, low price and high sensitivity, the temperature sensing probe 7 can be inserted into a pot spout when boiling water. When the water is boiled near 100DEG C, the loudspeaker 2 can dispatch a special sound in order to remind people, so the fire of the natural gas or the gas can not be extinguished by overflow water, and the fire can not be caused. The utility model can also be used as an electronic door bell when not boiling water.

Description

Dual function electronic warner for water boiling and door bell

The utility model belongs to a kind of telltale, and particularly water is driven the difunctional electronic alarm of calling and doorbell.

When people are engaged in certain activity, learn or see TV, often forget about easily being sitting in the kettle of heating up water on stove, liquefied gas, the coal gas heating basin, if water for a long time by boiled, drunk such water human body is harmful to.Water is by boiled, and kettle is burnt out, and such thing also is that Shi Youfa exists.Especially open to overflow when water liquefied gas or coal gas baked wheaten cake are gone out, be easy to cause fire.

At present, the boiling water Kettle with signalling means of on market, selling, its kettle lid seals, and uses very inconveniently, and could report to the police by the air pressure that water reaches to a certain degree, and sound is very ear-piercing.

The novel purpose of this use provides a kind of simple in structure, and is cheap and highly sensitive, can provide water to open automatic warning, also can regulate with owner's wish, especially in advance alarm.When not heating up water, the difunctional electronics water that can do the doorbell use again boils, Doorbell alarm device.

Description of drawings:

Fig. 1 is that circuit of the present utility model connects figure

Fig. 2 is a temperature-sensing probe structural drawing of the present utility model

Describe and provide embodiment in detail below in conjunction with accompanying drawing

As shown in Figure 1 and Figure 2, the utility model is by two transistor BG1, BG2, two resistance R 1, R2, and two capacitor C 1, C2, loudspeaker Y forms oscillator.BG1 and B G2 connect directly coupling by lead, and R1 provides the base current of BG1, and R2 provides one to exchange positive feedback voltage with the C1 series connection, and the end of loudspeaker Y connects the emitter of BG1, and the other end connects the collector of BG2.Temperature-sensing probe is the positive-negative-positive germanium triode of having packed in shell 1, utilize the resistance between transistor emitter e and the collector c, emitter e connects the positive pole of power-supply battery E, and collector c connects the pierce circuit power positive end, and the power-supply battery negative pole connects the negative terminal of pierce circuit.In the cross-over connection of pierce circuit two ends the capacitor C 2 of enough capacity is arranged, to reduce the influence that the temperature-sensing probe internal resistance value exists, improve the voice effect of pierce circuit.In the shell 1 of temperature-sensing probe the positive-negative-positive germanium triode around filled up epoxy resin stuff 2, use rubber seal then.Be in parallel with the positive-negative-positive germanium triode of temperature-sensing probe, connected doorbell switch ON.

The emitter e of the positive-negative-positive germanium triode of temperature-sensing probe and its impedance of resistance between the collector c are about 10 kilohms under the normal condition, circuit is equivalent to open circuit, so oscillator is not worked, when being used for the boiling water warning, temperature-sensing element is heated, and resistance raises with temperature and descends, when resistance drops to when having only several ohm, temperature-sensing element is equivalent to a switch, and circuit is connected.Circuit is connected the back and is provided a bias current by R1 to BG1, makes the BG1 conducting, and BG2 conducting thereupon provides a suitable feedback voltage by C1 and R1 to BG1 again after the BG2 conducting, makes entire circuit produce self-sustained oscillation, and loudspeaker Y sends sound equipment.

The utility model also can use in oil depot, and temperature-sensing probe is inserted in the oil, puts into the depth of position and can determine as required, gives fixed temperature as long as reach, and will report to the police.

Claims

1, a kind of telltale that belongs to, be particularly related to water and drive the difunctional electronic alarm of calling and doorbell, by loudspeaker Y, transistor BG, resistance R, capacitor C, switch ON and temperature-sensing probe are formed, it is characterized in that triode BG1 and BG2 are by the lead connection that directly is coupled, the base stage of resistance R 1 and BG1 links, connection electrical resistance R2 then, resistance R 2 is connected with capacitor C 1, one end of capacitor C 1 and the collector of transistor BG2 link, the end of loudspeaker Y connects the emitter of BG1, the other end connects the collector of BG2 and forms oscillator, has connected capacitor C 2 at the pierce circuit two ends; Temperature-sensing probe is the positive-negative-positive triode of packing in shell 1, around the positive-negative-positive triode, filled up epoxy resin stuff 2, the positive pole of transistor emitter e joining power E, collector c connects the emitter of BG2, and the emitter of the negative pole of power supply E and loudspeaker Y and BG1 links; Be in parallel with the positive-negative-positive germanium triode of temperature-sensing probe and met doorbell switch ON.