CN202512706U

CN202512706U - Gas leak alarm

Info

Publication number: CN202512706U
Application number: CN201220075659XU
Authority: CN
Inventors: 叶春; 高潮彬; 龚福智
Original assignee: CHENGDU ZHANGWO MOBILE INFORMATION TECHNOLOGY Co Ltd
Current assignee: CHENGDU ZHANGWO MOBILE INFORMATION TECHNOLOGY Co Ltd
Priority date: 2012-03-02
Filing date: 2012-03-02
Publication date: 2012-10-31
Anticipated expiration: 2022-03-02

Abstract

The utility model discloses a gas leak alarm. The gas leak alarm comprises an alternating current power supply, a power supply circuit, a detection control circuit and an execution circuit. The detection control circuit comprises a gas sensitive sensor, a first potentiometer, a second potentiometer, a fifth diode, a silicon controlled rectifier, a fourth capacitor and a relay. The execution circuit comprises a loudspeaker and a fan motor. When the gas content in the air is increased, the output voltage of the second potentiometer reaches above 2.5V. The gas sensitive device is switched into conduction. The first normally open switch of the relay is closed. The power supply of the exhaust fan is switched on, and the exhaust fan operates and exhausts air. The second normally open switch of the relay is closed, and the loudspeaker is powered and sends out loud alarm sounds. When the gas content in the air is exhausted and is less than the standard value, the bulk resistance of the gas sensitive device becomes large, and the execution circuit restores to the original static state. According to the utility model, by adjusting the resistance value of the potentiometers, the turn on sensitivity for the alarm of the circuits is changed; and the gas leak alarm has the advantages of stable performance, less power consumption, simple circuit, and convenient installation and debugging.

Description

Gas leakage alarm

Technical field

The utility model relates to a kind of warning device, relates in particular to a kind of gas leakage alarm.

Background technology

Family's cooking at present, cook all be to use coal gas; But in using course of gas; Usually can forget the turn out the gas valve, thereby cause gas leak to be poisoned that existing gas leakage alarm unstable properties, power consumption are big, circuit more complicated, Installation and Debugging are inconvenient to be unfavorable for popularizing.

Summary of the invention

The purpose of the utility model provides a kind of gas leakage alarm with regard to being in order to address the above problem.

The utility model is realized above-mentioned purpose through following technical scheme:

The utility model comprises AC power, power circuit, detection control circuit and executive circuit; Said detection control circuit comprises gas sensor, first potentiometer, second potentiometer, the 5th diode, controllable silicon, the 4th capacitor and relay; The electrode input end of said gas sensor is connected with the negative pole of the sliding end of first end of the cathode output end of said power circuit, said first potentiometer, said first potentiometer, said the 5th diode and first end of relay respectively; Second end of said first potentiometer is connected with first hot junction of said gas sensor; Second hot junction of said gas sensor is connected with said silicon controlled is anodal with first end of first end of the cathode output end of said power circuit, said the 4th capacitor, said second potentiometer respectively; Second end of said relay is connected with said silicon controlled negative pole with the positive pole of said the 5th diode respectively; The negative input of said gas sensor is connected with second end of said second potentiometer and second end of said the 4th capacitor respectively, and said silicon controlled control end is connected with the sliding end of said second potentiometer; Said executive circuit comprises loudspeaker and fan electromotor; Said loudspeaker is connected with cathode output end with the cathode output end of said power circuit respectively with its two ends, second normal open switch series connection back of said relay, and said fan electromotor is connected with the two ends of said AC power respectively with its two ends, first normal open switch series connection back of said relay.

The beneficial effect of the utility model is:

The utility model can the resistance through regulator potentiometer changes the sensitivity of starting to control of circuit alarm, has stable performance, power consumption is few, circuit is simple, Installation and Debugging advantage easily.

Description of drawings

Fig. 1 is the circuit diagram of the utility model.

Embodiment

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

As shown in Figure 1: the utility model comprises AC power, power circuit, detection control circuit and executive circuit; Said power circuit comprises power transformer T, rectification circuit UR and the first capacitor C1, and rectification circuit comprises the first diode VD1, the second diode VD2, the 3rd diode VD3 and the 4th diode VD4; Detect control circuit and comprise gas sensor QM, the first potentiometer RP1, the second potentiometer RP2, the 5th diode VD5, controllable silicon SCR, the 4th capacitor C4 and relay K; The electrode input end of gas sensor QM is connected with the cathode output end of power circuit, first end of the first potentiometer RP1, the sliding end of the first potentiometer RP1, the negative pole of the 5th diode VD5 and first end of relay K respectively; Second end of the first potentiometer RP1 is connected with first hot junction of gas sensor QM; Second hot junction of gas sensor QM is connected with the cathode output end of power circuit, first end of the 4th capacitor C4, first end of the second potentiometer RP2 and the positive pole of controllable silicon SCR respectively; Second end of relay K is connected with the positive pole of the 5th diode VD5 and the negative pole of controllable silicon SCR respectively; The negative input of gas sensor QM is connected with second end of the second potentiometer RP2 and second end of the 4th capacitor C4 respectively, and the control end of controllable silicon SCR is connected with the sliding end of the second potentiometer RP2; Executive circuit comprises loudspeaker B and fan electromotor M; Loudspeaker B is connected with cathode output end with the cathode output end of power circuit respectively with its two ends, second normal open switch K-2 series connection back of relay, and fan electromotor M is connected with the two ends of AC power respectively with its two ends, first normal open switch K-1 series connection back of relay.

As shown in Figure 1, the principle of work of the utility model is following:

The a of gas sensitive device, the k utmost point and the second potentiometer RP2 form voltage divider air are detected; When in the air during no inflammable gas; Bulk resistor between gas sensitive device a, the k is very big, and the second potentiometer RP2 output voltage is lower than 2.5V, and gas sensitive device QM remains static.If gas content increases in the air, the bulk resistor between gas sensitive device a, the k diminishes, and the second potentiometer RP2 output voltage increases; Gas content increases in air, can make the second potentiometer RP2 output voltage reach more than the 2.5V gas sensitive device QM conducting; The relay K adhesive; The relay first normal open switch K-1 is closed, connects the power supply of extraction fan, makes its running air draft; The closed power supply of connecting loudspeaker B of its Er Chang Kaikai K switch-2 makes its energising send loud chimes of doom.When gas composition in the air drained less than standard value, it is big that the bulk resistor of gas sensitive device becomes, and the executive circuit open circuit returns to original stationary state.

Claims

1. gas leakage alarm; It is characterized in that: comprise AC power, power circuit, detection control circuit and executive circuit; Said detection control circuit comprises gas sensor, first potentiometer, second potentiometer, the 5th diode, controllable silicon, the 4th capacitor and relay; The electrode input end of said gas sensor is connected with the negative pole of the sliding end of first end of the cathode output end of said power circuit, said first potentiometer, said first potentiometer, said the 5th diode and first end of relay respectively; Second end of said first potentiometer is connected with first hot junction of said gas sensor; Second hot junction of said gas sensor is connected with said silicon controlled is anodal with first end of first end of the cathode output end of said power circuit, said the 4th capacitor, said second potentiometer respectively; Second end of said relay is connected with said silicon controlled negative pole with the positive pole of said the 5th diode respectively; The negative input of said gas sensor is connected with second end of said second potentiometer and second end of said the 4th capacitor respectively, and said silicon controlled control end is connected with the sliding end of said second potentiometer; Said executive circuit comprises loudspeaker and fan electromotor; Said loudspeaker is connected with cathode output end with the cathode output end of said power circuit respectively with its two ends, second normal open switch series connection back of said relay, and said fan electromotor is connected with the two ends of said AC power respectively with its two ends, first normal open switch series connection back of said relay.