CN2532469Y - Multi-frequency infraved flame detector for industry fire fighting - Google Patents

Abstract

The utility model relates to a special multiple-frequency infrared flame detector specially for industrial fire control. In the structure of the utility model, an infrared background sensing circuit is composed of an infrared background sensor G4, a preamplifier circuit, a selective amplifier circuit and a signal converting circuit; a flame infrared sensing circuit is composed of a flame infrared sensor G3, a preamplifier circuit, a selective amplifier circuit and a signal converting circuit; a SCM is used for processing the data collected by the infrared sensing circuit and then sending an alarm signal. Wherein the output terminal of the infrared background sensor is connected with a wiring foot 13 of an operational amplifier circuit in the preamplifier circuit through the capacitive resistance coupling of a E8 and a R25; the output terminal of the preamplifier circuit is connected with a wiring foot 5 of the operational amplifier circuit in the selective amplifier circuit, and the output terminal of the selective amplifier circuit is connected with a wiring foot 3 of the operational amplifier circuit in the signal converting circuit; the output terminal of the signal converting circuit is connected with a wiring foot 18 of the SCM. The analogue quantity signal is output through a wiring foot 1 and a wiring foot 2 of the SCM, the fire alarm switching value signal is output through a wiring foot 6, and a failure switching value signal is output through a wiring foot 7.

Description

The special-purpose multifrequency infrared flame detector of industrial fire

Technical field

The utility model relates to the special-purpose multifrequency infrared flame detector of a kind of industrial fire, and this detector is the typical infrared flame detector that the naked light during for hydrocarbons or carbon compound burning carries out detection alarm.

Background technology

At present, domestic typical infrared flame detector mostly is low frequency two waveband or multiband infrared flame detector greatly, the shortcoming of this detector is when running into the medium-and-large-sized flame of high light intensity or high frequency (40-100Hz), alert phenomenon occurs failing to report owing to the signalling channel electronic circuit is saturated.Can not survey various complicated large, medium and small fire in the industrial fire, the fire extinguishing of can not reporting to the police automatically accurately and reliably in effective and safe ground.Therefore, need to propose a kind of new multifrequency infrared flame detector.

Summary of the invention

The purpose of this utility model is to provide a kind of industrial fire special-purpose multifrequency infrared flame detector, and this detector sensitivity height, antijamming capability be strong, can prevent the detector wrong report effectively and fail to report.

The purpose of this utility model is realized by following technical proposals: the special-purpose multifrequency infrared flame detector of a kind of industrial fire, two infrared sensors are arranged, constitute the background infrared sensing circuit by background infrared sensor, pre-amplification circuit, selective frequency amplifier circuit, signaling conversion circuit;

Constitute the flame infrared sensing circuit by flame infrared sensor, pre-amplification circuit, selective frequency amplifier circuit, signaling conversion circuit; Send alerting signal after by single-chip microcomputer the data of described infrared sensing circuit collection being handled;

The 13rd pin of the discharge circuit of the output terminal of described background infrared sensor in E8, R25 capacitance-resistance lotus root splice grafting pre-amplification circuit, the 5th pin of the discharge circuit in the output terminal selecting frequency amplifying circuit of pre-amplification circuit, the 3rd pin of the discharge circuit in the output termination signaling conversion circuit of selective frequency amplifier circuit, the output terminal of signaling conversion circuit connects the 18th pin of single-chip microcomputer;

The 2nd pin of the discharge circuit of an output terminal of described flame infrared sensor in E7, R21 capacitance-resistance lotus root splice grafting pre-amplification circuit, the 6th pin of the discharge circuit in the output terminal selecting frequency amplifying circuit of pre-amplification circuit, the 12nd pin of the discharge circuit in the output termination signaling conversion circuit of selective frequency amplifier circuit, the output terminal of signaling conversion circuit connects the 17th pin of single-chip microcomputer, constitutes flare up fire low channel circuit;

Another output terminal of described flame infrared sensor is put the 13rd pin of the discharge circuit in the big circuit through E4, R16 capacitance-resistance lotus root splice grafting, the 5th pin of the discharge circuit in the output terminal selecting frequency amplifying circuit of pre-amplification circuit, the 3rd pin of the discharge circuit in the output termination signaling conversion circuit of selective frequency amplifier circuit, the output terminal of signaling conversion circuit connects the 3rd pin of single-chip microcomputer, constitutes flare up fire hf channel circuit;

The 1st pin of described single-chip microcomputer, the 2nd pin output analog signals; The 6th pin output fire alarm switching value signal; The 7th pin output breakdown switch amount signal.

The utility model compared with prior art has following advantage:

The utility model is made up of three parts, is respectively flare up fire hf channel circuit, flare up fire low channel circuit and background signal channel circuit.Detector adopts flame and the two informix sensing technologies of background radiation, utilize change in radiation intensity and the radiation frequency variation to flare up fire and bias light undesired signal on two different characteristic wave bands of two infrared sensing elements to respond, the data of gathering in real time three signalling channels by internal microprocessor go forward side by side row operation, processing, analysis and judgement, its judged result sends fire alarm control unit or load module to as the status information of detector.Because detector extracts, processes, handles flame information and background information simultaneously aspect two of hardware and softwares, thereby prevent the detector wrong report effectively and fail to report.

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, respectively flare up fire and background signal are handled, and judge that according to the variation relation of two band signal flame takes place, reach early detection flame and suppress the purpose of wrong report.

Description of drawings

The utility model is described in further detail below in conjunction with drawings and Examples

Fig. 1, be theory diagram of the present utility model

Fig. 2, be electrical schematic diagram of the present utility model

Fig. 3, infrared sensor synoptic diagram of the present utility model (partial sectional view)

Fig. 4, infrared sensor side view of the present utility model (Fig. 3 left side view)

Embodiment

Referring to Fig. 1, Fig. 2, Fig. 3, flame detector of the present utility model has two infrared sensors, constitutes the background infrared sensing circuit by background infrared sensor G4, pre-amplification circuit U6D, selective frequency amplifier circuit U6B, signaling conversion circuit U6A;

Constitute the flame infrared sensing circuit by flame infrared sensor G3, pre-amplification circuit, selective frequency amplifier circuit, signaling conversion circuit; Send alerting signal after by single-chip microcomputer U3 the data of described infrared sensing circuit collection being handled;

The pin 13 of the discharge circuit of the output terminal of described background infrared sensor in capacitor E8, resistance R 25 capacitance-resistance lotus root splice grafting pre-amplification circuits, the pin 5 of the discharge circuit in the output terminal selecting frequency amplifying circuit of pre-amplification circuit, the pin 3 of the discharge circuit in the output termination signaling conversion circuit of selective frequency amplifier circuit, the output terminal of signaling conversion circuit connects the pin 18 of single-chip microcomputer U3;

The pin 2 of the discharge circuit of an output terminal of described flame infrared sensor in capacitor E7, resistance R 21 capacitance-resistance lotus root splice grafting pre-amplification circuit U5A, the pin 6 of the discharge circuit among the output terminal selecting frequency amplifying circuit U5B of pre-amplification circuit, the pin 12 of the discharge circuit among the output termination signaling conversion circuit U5D of selective frequency amplifier circuit, the output terminal of signaling conversion circuit connects the pin 17 of single-chip microcomputer, constitutes the low frequency signal passage;

Another output terminal of described flame infrared sensor is put the pin 13 of the discharge circuit among the big circuit U 4D through capacitor E4, resistance R 16 capacitance-resistance lotus root splice graftings, the pin 5 of the discharge circuit among the output terminal selecting frequency amplifying circuit U4B of pre-amplification circuit, the pin 3 of the discharge circuit among the output termination signaling conversion circuit U4A of selective frequency amplifier circuit, the output terminal of signaling conversion circuit connects the pin 3 of single-chip microcomputer, constitutes the high-frequency signal passage;

The pin 1 of described single-chip microcomputer, pin 2 output analog signalses; Pin 6 output fire alarm switching value signals; Pin 7 output breakdown switch amount signals.

Referring to Fig. 3 and Fig. 4, infrared sensor of the present utility model is made up of housing 2, main frame 1, bonnet 3, support 4, mounting seat 5, multifrequency infrared sensor wiring board 6, described housing is in the form of annular discs, can be installed in the scene of detection by support, described two multifrequency infrared sensor wiring boards are obturaged with the epoxy resin pouring in main frame, constitute blast resistance construction.But the infrared sensor housing rotates 360 degree in the plane under support and mounting seat cooperation, the elevation angle 90 degree.

Have two infrared sensors to form the signal processing channel of two different-wavebands in the detector of the present utility model, one is the flare up fire detection channels, and another is the bias light detection channels.Radiation variation to flare up fire and background interference signal (as: non-fire infrared radiation such as electric arc welding and artificial hot body disturbs for sunlight, illumination) responds respectively respectively on two wave bands of middle infrared spectral region; Response signal is amplified through operational amplifier, conversion back input single-chip microcomputer.

The flare up fire detection channels is divided into two electronic circuits again, one for low frequency by circuit (8-35Hz)

Another for high-frequency by circuit (40-100Hz) flame during respectively to small-sized fire and in, the flame during large-sized fire surveys, and makes its detecting function more comprehensive.Detector is given fire alarm control unit with result of detection as status information transmission.Constitute complete fire detection alarm system.

Signal is after analog to digital conversion, detector utilizes core component single-chip microcomputer (its model is PICl6C711) to carry out data acquisition and data processing function, and directly flare up fire is carried out relevant computing and analysis with background signal, judge according to the variation relation of two channel signals to have or not flame to exist, and output passive switch amount signal and 4-20nlJL standard analog amount signal.

The utility model adopts photoconduction type infrared sensing device as infrared sensor, this detector sensitivity height, and response speed is fast, and the life-span is long, surveys cone of sight and can reach 90 degree, and ultimate range can reach 175 meters.Be widely used in that height of a house height, span are big, fire initial stage cigarette, the temperature affected underground works of diffusion and volumed space building place, also can be used for inflammablely, explosive, humidity has in the rugged environment such as dust pollution.Have widely to promote and produce and use value, potential huge social and economic benefit.

Claims (1)

1, the special-purpose multifrequency infrared flame detector of a kind of industrial fire has two infrared sensors, it is characterized in that: constitute the background infrared sensing circuit by background infrared sensor G4, pre-amplification circuit U6D, selective frequency amplifier circuit U6B, signaling conversion circuit U6A;

Constitute the flame infrared sensing circuit by flame infrared sensor G3, pre-amplification circuit U4D, selective frequency amplifier circuit U4B, signaling conversion circuit U4A; Send alerting signal after by single-chip microcomputer U3 the data of described infrared sensing circuit collection being handled;

The pin 13 of the discharge circuit of the output terminal of described background infrared sensor in E8, R25 capacitance-resistance lotus root splice grafting pre-amplification circuit, the pin 5 of the discharge circuit in the output terminal selecting frequency amplifying circuit of pre-amplification circuit, the pin 3 of the discharge circuit in the output termination signaling conversion circuit of selective frequency amplifier circuit, the output terminal of signaling conversion circuit connects the pin 18 of single-chip microcomputer U3;

The pin 2 of the discharge circuit of an output terminal of described flame infrared sensor in E7, R21 capacitance-resistance lotus root splice grafting pre-amplification circuit U5A, the pin 6 of the discharge circuit among the output terminal selecting frequency amplifying circuit U5B of pre-amplification circuit, the pin 12 of the discharge circuit among the output termination signaling conversion circuit U5D of selective frequency amplifier circuit, the output terminal of signaling conversion circuit connects the pin 17 of single-chip microcomputer, constitutes flare up fire low channel circuit;

Another output terminal of described flame infrared sensor is put the pin 13 of the discharge circuit among the big circuit U 4D through E4, R16 capacitance-resistance lotus root splice grafting, the pin 5 of the discharge circuit among the output terminal selecting frequency amplifying circuit U4B of pre-amplification circuit, the pin 3 of the discharge circuit among the output termination signaling conversion circuit U4A of selective frequency amplifier circuit, the output terminal of signaling conversion circuit connects the pin 3 of single-chip microcomputer, constitutes flare up fire hf channel circuit;

The pin 1 of described single-chip microcomputer, pin 2 output analog signalses; Pin 6 output fire alarm switching value signals; Pin 7 output breakdown switch amount signals.