CN2156507Y

CN2156507Y - Gas poisoning proof alarm device

Info

Publication number: CN2156507Y
Application number: CN 93214511
Authority: CN
Inventors: 郑明德
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-05-22
Filing date: 1993-05-22
Publication date: 1994-02-16
Anticipated expiration: 2003-05-22

Abstract

The utility model relates to an alarm for preventing gas poisoning, which is composed of a shell body and a circuit board. A circuit system is composed of a power circuit (1), a sensing circuit (2), a threshold comparison circuit (3) and an acoustic-optic alarm circuit (4). When the content of gas exceeds a safety value, the resistance of a gas sensor varies. The threshold value is set into two stages, wherein, the first stage is that a red light lights when air which is beyond purifying standards is harmful to a human body; the second stage is that a sounder BL beeps to alarm when the gas of which the content is over dangerous standards possibly injuries the human body. The utility model which is used as an alarm can also be used as a door bell simultaneously. Therefore, the utility model has the advantages of multifunction, simple structure, easy fabrication, low cost and high sensitivity.

Description

Gas poisoning proof alarm device

The utility model relates to a kind of gas alarm device.

In daily life, when coal consumption of living and charcoal burning, produce a certain amount of carbonic oxide inflammable gas, the oil liquefied pot leaks also can discharge coal gas, when these harmful inflammable gass reach finite concentration, just may make people's death by suffocation, under certain condition, also can set off an explosion on fire.Therefore, gas leak detector has become the necessary household electrical appliance of general family.

The purpose of this utility model provides a kind of simple in structure, cheap, highly sensitive warning device.

The technical solution of the utility model is: it is made up of the warning circuit plate in housing and the housing.Characteristics of the present utility model are that circuit has adopted integrated circuit, and it is to be made of power circuit (1), sensing circuit (2), threshold values comparator circuit (3) and sound light alarming circuit (4).Power circuit is by transformer, rectifier bridge heap VD ₄, capacitor C ₁Form.Sensing circuit is by gas sensor QM and resistance R ₆Constitute.The threshold values comparator circuit is by integrated circuit modules IC ₂, IC ₃And resistance R ₈-R ₁₀Constitute.Sound light alarming circuit is by resistance R ₁₂-R ₁₄, integrated circuit modules IC ₄, light emitting diode VD ₂, triode V ₁With sound equipment BL structure.In order to make gas sensor QM give heat 3 minutes, reach the incipient stability state, by integrated circuit modules IC ₁With corresponding resistive element R ₂, R ₃, R ₄, diode VD ₃Capacitor C ₂Formed delay circuit.Integrated circuit modules IC ₅And R ₁₁, R ₁₅C ₃For doorbell circuit is established.

Light emitting diode VD ₁, VD ₂Partly be exposed to outside the housing.

The pairing housing parts of gas sensor has air hole.

Principle of work: sensing circuit is mainly finished the conversion of harmful gas → electricity, when harmful gas contacts with gas sensor QM, will cause that this gas sensor resistance changes, and the concentration big resistance that heals is littler, makes ic chip ₂E point and ic chip ₃The F point corresponding to original two indexs setting: air purification exceeds standard, and slight carbonic oxide 10Mg/m is promptly arranged ³Should come into the picture; The carbonic oxide danger 250Mg/m that exceeds standard ³, must take measures, as ventilating.Harmful gas surpasses established standards and promptly sends sound and light alarm---the one-level light emitting diode VD that exceeds standard ₂Luminous, the secondary sounder BL sounding that exceeds standard reaches the purpose of warning.

Description of drawings:

Fig. 1 is the utility model electrical schematic diagram.

Embodiment:

In the circuit of the present utility model, adopt transformer that the 220V civil power is become low-voltage AC, through rectifier bridge heap VD ₄And capacitor C ₁Output direct current+6V power supply, luminotron VD ₁Be the power supply indication.It is sensing head that sensing circuit (2) adopts gas sensor QM, and it is to be detected that energized adds 3 minutes stable backs of electric preheating for the QM heated filament, meets harmful gas such as coal gas, carbonic oxide inflammable gas, R ₆Two ends produce a voltage, and this is worth greater than setting value (E point and F point), promptly send sound and light alarm (this setting voltage value is worth as a comparison, and standard is set up according to the pertinent regulations of state before dispatching from the factory), VD ₂Luminous or sounder BL sounding.

Claims

1, a kind of prevention gas poisoning alarm, it is made up of housing and warning circuit plate, it is characterized in that the warning circuit plate is made up of power circuit (1), sensing circuit (2), threshold values comparator circuit (3) and sound light alarming circuit (4), its power supply is by transformer and rectifier bridge heap VD ₄, capacitor C ₁Constitute; Sensing circuit is by QM gas sensor and resistance R ₆Constitute; The threshold values comparator circuit is to be made of integrated circuit modules and corresponding resistive element; Sound light alarming circuit is by integrated circuit modules IC ₂, IC ₃With triode V ₁And sounder BL, light emitting diode VD ₂Constitute.

2, alarm according to claim 1 is characterized in that integration module IC ₂E point and integration module IC ₃The F point be provided with two indexs, promptly reach 10Mg/m as CO ³The time be first alarm set point, when CO reaches 250Mg/m ³The time be second alarm set point.

3, alarm according to claim 1 is characterized in that, VD ₁Luminotron is done the power supply indication; Light emitting diode VD ₁, VD ₂Partly be exposed to outside the housing; The pairing housing parts of gas sensor QM has air hole.