CN2062874U

CN2062874U - Portable automatic alarm for forest fire accident

Info

Publication number: CN2062874U
Application number: CN 90203403
Authority: CN
Inventors: 胡明臣; 张景忠; 周薇
Original assignee: HEILONGJIANG PROV FOREST PROTECTION INSTITUTE
Current assignee: HEILONGJIANG PROV FOREST PROTECTION INSTITUTE
Priority date: 1990-03-21
Filing date: 1990-03-21
Publication date: 1990-09-26

Abstract

The utility model relates to a portable automatic alarm for a forest fire accident, solving the problems that the present forest fire prevention can not be predicted automatically and fire safety can not be efficiently taken by means of scientific data, etc. The utility model is characterized in that the signal output from a sensor provides temperature, humidity, speed of wind, wind direction and fire size class for fire prevention department in the form of display and print after the signal is calculated through a micro computer and an optimum module signal processing circuit. The alarm can alarm automatically in the situation of high fire hazard. The utility model has the advantages of high precision of fire prevention and predication, convenient meteorological data collection, small size and convenience for carrying. The portable automatic alarm for the forest fire accident is an ideal forest fire prevention predictor for a forestry department.

Description

Portable automatic alarm for forest fire accident

The utility model relates to the forest zone firebreak device, especially portable risk of forest fire autoalarm.

Forest fire protection is one of major tasks of China forest department.And present forest fire protection device no matter from function, still from result of use, far can not satisfy our detection and the prevention needs to forest fire.As, by " the thunder and lightning calculating instrument " in Canada assistance forest zone, Daxing'an Mountainrange, Heilongjiang Province, it can only lean on what of the number of times that mechanically adds up lightning, infers to have or not lightning fire may take place, though it can be reported to the police, the height of its fire size class can not be described.If when strong wind or dry climate, this thunder and lightning calculating instrument " just lost anti-fire action.In order to reduce the generation of forest fire, at first should be predicted as the master with risk of forest fire.Promptly infer fire size class in following several days, so that relevant department takes corresponding fire prevention measure according to meteorological factor.

The utility model purpose is, by detecting meteorological factor, a kind of automatic demonstration is provided, prints meteorological factor, fire size class, and the portable risk of forest fire autoalarm of when the high temperature fire, reporting to the police automatically.

The utility model technical solution: four sensors are set, they are respectively air velocity transducer, wind transducer, temperature sensor and humidity sensor, these four sensors are after signal processing circuit is handled, deliver to A/D converter by multi-way switch circuit, under microprocessor control, calculate fire size class at last, and by display, the digital quantity and the fire size class of above-mentioned four sensors of printer output.In order to guarantee the sensitivity of this device, signal processing circuit is the major technique feature of this device, this circuit concrete structure is: adopt 5 operational amplifiers to form three mould signal amplification channel circuit, first simulating signal amplification channel adopts one-level to amplify, and all the other two amplification channels are adopted two-stage and amplified.First passage is a temperature sensor mould amplification channel, and in this passage, the resistance of the pressure limiting resistance of temperature sensor is 19K～21K, and the resistance of feedback resistance is 39K～41K; Second channel is a humidity sensor mould amplification channel, and in this passage, humidity sensor and first order amplifier are anti-, the resistance between the normal phase input end is 200 Ω～300 Ω, and this grade feedback resistance is 4K～6K; Third channel is a wind transducer mould amplification channel, and in this passage, the resistance between wind transducer and the first order amplifier inverting input is 28K～32K, and the resistance of this grade feedback resistance is 10K～14K.

The utility model utilizes the meteorological data of two more than ten years of the main forest zone of China to be analysis foundation, and in conjunction with the concrete condition of combustible, hardware and software rational design and programming have been done, make this device have fire prevention predictablity rate height (more than 90%), advantages such as the weather data collection is convenient, and volume is little, in light weight, be easy to carry.During particularly suitable burn fire line, on-the-spot data acquisition and for the team that puts out the fire formulates effectively the method for putting out the fire provides reliable scientific basis.Therefore, it is the comparatively ideal forest fire protection predictor of forest department.

Fig. 1 is the utility model work block diagram.

In Fig. 1,1 air velocity transducer, 2 wind transducers, 3 temperature sensors, 4 humidity sensors, 5 signal processing circuits, 6 multi-way switchs, 7A/D converter, 8 alarms, 9 microprocessors, 10 latchs, 11 memories, 12 displays, 13 keyboards, 14 programmable interface circuit, 15 printers.Four sensors in this block diagram, except that air velocity transducer with digital quantity output directly with the digital quantity input end of multi-way switch links to each other, its excess-three sensor then links to each other with the mould input end of multi-way switch by the signal processing circuit processing.Multi-way switch is two differential four in-gate circuits, and microprocessor is 8031.

Below in conjunction with Fig. 2 the utility model most preferred embodiment is described.

This device of Fig. 2 fundamental diagram, in Fig. 2,1A/D converter (model: 14433), 2 microprocessors (model: 8031), 3 latch (models: 74LS373), 4 memories (model: 2732), 5 two differential four input circuits (are the multi-way switch 6 among Fig. 1, model: CD4052), 6 signal processing circuits, 7 six inversion device (models: 7404), 8 print circuit (models: GP-16), 9 programmable interface circuit (models: 8155), 10 shift registers/converter (model: 7407), 11 warning circuits, 12 display circuits, 13 sensors (comprise temperature sensor T, its model: AD590; Humidity sensor H, its model: RSC-1; Wind transducer W _X, its model: EYC3-1).

Fig. 3 is the schematic diagram of signal processing circuit 6 among Fig. 2.

In Fig. 3, A operational amplifier, R ₁～R ₁₃Resistance.Can find out that from this figure 5 operational amplifier A are formed three mould signal amplification channels.In the mould amplification channel of temperature sensor T, because the linear output coefficient of temperature sensor T is 1 μ A/K, be 40mv/c, so reach best debugging resistance R as calculated for guaranteeing that this grade output signal varies with temperature ₁Span be 19K～21K, resistance R ₂Span be 39K～41K, resistance R ₃=R ₁∥ R ₂In the mould amplification channel of humidity sensor H, because humidity sensor H _-Floating ground, so amplify through two-stage, making output signal is 5mv/H, for guaranteeing this value, resistance R ₄, R ₅Resistance be 200 Ω～300 Ω, resistance R ₆Resistance be 4K～6K, R ₇=R ₉=2K.At wind transducer W _XThe mould amplification channel in, adopt two-stage oppositely to amplify, and forward end ground connection.

In conjunction with Fig. 2 the utility model course of work is described:

The meteorological factor that sensor 13 is gathered, after signal processing circuit 6 is handled, deliver to two differential four input circuits 5, because the control end INH ground connection of this circuit, the data of input are by microprocessor 2 controls, deliver to successively in A/D converter 1 and six phase inverters 7, carry out analog to digital conversion, program is accessed to wait for by the memory 4 of microprocessor 2 control peripheral hardwares and latch 3.As calculated, relatively the back by programmable interface circuit 9 to the periphery equipment output fire predict the outcome, promptly provide the fire data of science for fire prevention department, thereby reach the utility model purpose by printing, demonstration and type of alarm.

Claims

1, a kind of portable risk of forest fire autoalarm, mainly by microprocessor, A/D converter, alarm, display, printer are formed, and it is characterized in that described signal processing circuit 5 is made up of 5 amplifier A of three mould signal amplification channels:

A, in the mould amplification channel of temperature sensor T, the pressure limiting resistance R of temperature sensor T ₁Standard resistance range be 19K～21K, feedback resistance R ₂Standard resistance range be 39K～41K;

B, in the mould amplification channel of humidity sensor H, humidity sensor H and amplifier A are anti-, the resistance R between the normal phase input end ₄, R ₅Resistance be 200 Ω-300 Ω, feedback resistance R ₆Resistance be 4K～6K;

C, at wind transducer W _xThe mould amplification channel in, wind transducer W _xAnd the resistance R between the amplifier A inverting input ₁₀Resistance be 28K～32K, feedback resistance R ₁₁Resistance be 10K～14K.

2, portable risk of forest fire autoalarm according to claim 1, its feature:

A, in the mould amplification channel of temperature sensor T, the resistance R that links to each other with amplifier A positive terminal ₃=R ₁∥ R ₂

B, in the mould amplification channel of humidity sensor H, adopt two-stage to amplify, and, R ₇=R ₉=2K;

C, at wind transducer W _XThe mould amplification channel in, adopt two-stage oppositely to amplify, and forward end ground connection.