CN2392177Y

CN2392177Y - Linear type combustible gas detector

Info

Publication number: CN2392177Y
Application number: CN 99250262
Authority: CN
Inventors: 张玺林; 王文青; 刘凯; 林清泉
Original assignee: SHENYANG FIRE FIGHTING SCIENCE
Current assignee: SHENYANG FIRE FIGHTING SCIENCE
Priority date: 1999-11-11
Filing date: 1999-11-11
Publication date: 2000-08-16
Anticipated expiration: 2009-11-11

Abstract

The utility model discloses a linear type combustible gas detector, which relates to the field of detection and alarming of the combustible gas and is composed of an emitter and a receiver. The circuit of the emitter is composed of a switch power supply circuit and a voltage regulating circuit, and the circuit of the receiver is composed of a signal extraction circuit, a signal amplification circuit, an integrating circuit, a synchronizing separating circuit, a difference circuit and an output interface circuit. The utility model adopts photoconductive type infrared sensing devices, forms a reference and a test wavebands through an optical filtering unit and respectively manifests two characteristics of no reaction and absorption to the alkane type combustible gas. The utility model judges if the leaked combustible gas exists according to the changing relation of the signal of two wavebands, in order to achieve the purposes of detecting the leaked combustible gas early and restraining the false alarm. So the utility model has the advantages of the extremely high detection sensitivity, high response speed, no poisoning and long service life, and the maximum distance of detection can achieve 80 meters.

Description

The line style combustible gas probe

The utility model relates to the line style combustible gas probe that use in a kind of combustible gas detecting warning field.

The present domestic combustible gas probe of radio-type still, existing product is a type combustible gas probe, its principle of work is: adopt a gas sensor, carry out chemical reaction by itself and near inflammable gas, thereby the resistance characteristic that causes gas sensor changes, determine the concentration that detector leaks inflammable gas on every side according to the size of change in resistance, the shortcoming of this type of detector is: the life-span of detector is shorter, and operation its sensitivity of a period of time will descend significantly because of the influence that is subjected to factors such as environment; When the high concentration combustible gas leakage occurring, also easily cause the poisoning of detector; The protection area of this kind detector is little, and present rig-site utilization also is only limited to keypoint part and lays.

The purpose of this utility model provides a kind of detection sensitivity height, antijamming capability strong, report to the police rapid and high line style combustible gas probe of accuracy that satisfies large space, the application of large tracts of land leakage combustible gas detecting.

For achieving the above object, the technical solution of the utility model is: a kind of line style combustible gas probe, and detector is made up of two parts, i.e. transmitter and receiver; Transmitter circuit mainly is made up of following components: switching power circuit, regulating circuit, and its circuit is connected to: the G1 of Switching Power Supply output termination regulating circuit, G1 is connected with R5 and P2 and overregulates the P2 value, regulates the size of output voltage; Acceptor circuit mainly is made up of following components: signal extraction, signal amplification, integrating circuit, synchronizing separator circuit, difference channel and output interface circuit, the each several part circuit is connected to: resistance R 1 one termination VCC, one termination sensor T1, T1 other end ground connection, the T1 output signal connects with signal amplification circuit by electrochemical capacitor E3 and links to each other, signal amplification circuit output links to each other with synchronizing separator circuit, the output of synchronizing separator circuit links to each other with integrating circuit, the output of integrating circuit links to each other with difference channel, and the output of difference channel links to each other with output interface circuit.

The utility model adopts photoconduction type infrared sensing device as infrared sensor, form reference and two wave bands of test by the optically filtering unit, be positioned at respectively the alkanes inflammable gas to be shown on two wave bands of middle infrared and do not react and absorb two specific characters, detector is judged to have or not according to the variation relation of two band signal and is leaked inflammable gas and exist, reach the purpose that early detection leaks inflammable gas and suppresses wrong report, this detector has high detection sensitivity, and response speed is fast, do not poison, life-span is long, survey ultimate range and can reach 80 meters, this detector can be widely used in the petrochemical enterprise piping system, large-scale oil depot, pump house, the oil liquefied gas station, the detection of place combustible gas leakages such as oil tank group and offshore production platform, for preventing the certain positive role of having of fire and pernicious explosion accident, have widely to promote and produce and use value, potential huge social and economic benefit.

Fig. 1 is the connection diagram of the utility model receiver Switching Power Supply and regulating circuit.

Fig. 2 is extraction, amplification, integration synchronizing separator circuit, difference, fault alarm and the output interface circuit circuit connection diagram of the utility model signal.

Below in conjunction with accompanying drawing principle of work of the present utility model is further described: transmitter adopts iodine-tungsten lamp as light source, switching power circuit provides the power supply of a constant voltage for iodine-tungsten lamp, regulating circuit is regulated the size of output voltage by regulating the P2 value, thereby regulate the size of transmitter Output optical power, the incident light of being sent by transmitter is coupled by E3 through sensor T1 detection generation signal, the input signal amplifying circuit, through multistage amplification, produce desirable signal input synchronizing separator circuit, the Signal Separation of reference and two wave bands of test is come out, deliver to integrating circuit, change the AC signal of two wave bands into direct current signal, input difference circuit then, the output of difference channel connects output interface circuit, by interface circuit the output signal of difference channel is sent to alarm controller, wherein signal amplifies, integrating circuit, synchronizing separator circuit, difference channel and output interface circuit all adopt existing custom circuit.

Claims

1, a kind of line style combustible gas probe is characterized in that detector is made up of two parts, i.e. transmitter and receiver; Transmitter circuit mainly is made up of following components: switching power circuit, regulating circuit, and its circuit is connected to: the G1 of Switching Power Supply output termination regulating circuit, G1 is connected with R5 and P2 and overregulates the P2 value, regulates the size of output voltage; Acceptor circuit mainly is made up of following components: signal extraction, signal amplification, integrating circuit, synchronizing separator circuit, difference channel and output interface circuit, the each several part circuit is connected to: resistance R 1 one termination VCC, one termination sensor T1, T1 other end ground connection, the T1 output signal connects with signal amplification circuit by electrochemical capacitor E3 and links to each other, signal amplification circuit output links to each other with synchronizing separator circuit, the output of synchronizing separator circuit links to each other with integrating circuit, the output of integrating circuit links to each other with difference channel, and the output of difference channel links to each other with output interface circuit.