CN2620333Y - Combustible toxic gas detecting alarm usable in helmet - Google Patents

Abstract

The utility model discloses a combustible and poisonous gas detect and alarm device buried in a safety cap, comprising a gas sensor, an amplifier, a central processing unit, a digital displayer, an acousto-optic warner and a electric source. With small volume and light weight, the detect and alarm device can be arranged in the safety cap and is convenient to carry. The utility model is suitable to be installed in the safety caps for the workers to detect and warn in places such as coal mine and oil field that are easy to have combustible and poisonous gas.

Description

Can place combustibility, toxic gas detection warning device in the safety helmet

(1) technical field

The utility model relates to a kind of gas-detecting device.Specifically, be mounted in the detection alarm device that safety helmet is interior, be used to monitor combustibility, harmfulness gas.Be particularly useful for being installed in colliery and oil field etc. and easily produce in the safety of workers cap of inflammable gas and harmful gas occasion, make the usefulness of detection alarm.

(2) background technology

At present, easily produce the occasion of inflammable gas and harmful gas in the mine in colliery and oil field etc., acoustic-optic alarm mostly is installed.For preventing the generation of explosion accident, require this warning device will have explosion prevention function.Make it have explosion prevention function, just need it to have thicker shell, make its volume and weight increase.Therefore, this warning device can only be used in stationary applica-tions, can not carry.In addition, for improving the warning effect, just require its power to want big.Power one is big, and the power that needs is just big.Power one is big, just can only use fixed power source.Therefore, this warning device also can only use in stationary applica-tions.

(3) summary of the invention

The purpose of this utility model is to provide a kind of combustibility, toxic gas detection warning device.This detection alarm device, volume is little, in light weight, can be installed in the safety helmet, is easy to carry.

For achieving the above object, the utility model adopts following technical solution:

Combustibility, the toxic gas detection warning device that can place in the safety helmet of the present utility model, its design feature is to be made of gas sensor (N1), amplifier (T2), central processing unit (CPU), nixie display (SM1, SM2), audible-visual annunciator and power supply (DC).The positive and negative end of gas sensor device (N1) joins with positive input terminal 3 pin of amplifier (T2) and ground respectively, is connected to resistance (R2) between its positive and negative end.Negative input end 2 pin of amplifier (T2) are connected to resistance (R4 and R3) respectively with the positive interpolar of ground and power supply (DC), are connected to resistance (R1 and R5) respectively between the positive interpolar of the anode of gas sensor (N1) and power supply (DC), negative input end 2 pin of amplifier (T2) and its output terminal 6 pin.Analog comparator anode 12 pin in output terminal 6 pin of amplifier (T2) and the central processing unit (CPU) link to each other, and analog comparator negative terminal 13 pin are connected to the charge circuit of being made up of resistance (R6) and capacitor (C1).Be connected to the clock oscillation loop of forming by crystal oscillator (JZ) and two capacitors (C2 and C3) between 4,5 pin of central processing unit (CPU).The positive interpolar of central processing unit (CPU) input/ output port 14,15 pin and power supply (DC) is connected to hummer (LB) and light emitting diode (LD1) respectively.Also be connected to nixie display (SM1 and SM2) on the delivery outlet of central processing unit (CPU), this two nixie display 0, A, B, C, D, E, F, G pin be connected on respectively on the input/ output port 18,19,2～9 and 11 pin of central processing unit (CPU) accordingly.Be connected to button (A1, A2) respectively between input/ output port 16,17 pin of central processing unit (CPU) and ground.

Adopt such scheme, have the following advantages:

Because combustibility of the present utility model, toxic gas detection warning device only are made of several parts such as gas sensor, amplifier, central processing unit and acoustic-optic alarms, used unit, device are few, volume is little, in light weight, can be installed in the safety helmet, be easy to carry.Again because combustibility of the present utility model, toxic gas detection warning device adopt noncontacting switch, do not need explosion-proofly, also can make its volume-diminished, weight saving, also lay the first stone for realizing that it is easy to carry.

(4) description of drawings

Accompanying drawing is of the present utility modelly can place the combustibility in the safety helmet, toxic gas detection warning device electricity principle schematic.

(5) embodiment

See accompanying drawing, combustibility, the toxic gas detection warning device that can place in the safety helmet of the present utility model comprises gas sensor N1, amplifier T2, central processor CPU, light emitting diode LD1, hummer LB and nixie display and power supply etc.Wherein: the positive and negative end of gas sensor N1 is connected with ground with positive input terminal 3 pin of amplifier respectively, also is parallel with resistance R 2 between its positive and negative end.Between negative input end 2 pin and ground of amplifier, be connected to resistance R 4, R3, R1 and R5 respectively between negative input end 2 pin of the positive interpolar of the anode of the positive interpolar of negative input end 2 pin of amplifier and power supply, gas sensor N1 and power supply and amplifier and its output pin, set up a suitable working point for the negative input end of amplifier by resistance R 3, R4, can save one group of negative supply like this.Resistance R 1, R2 are used for the impedance matching with gas sensor N1.R5 is a negative feedback resistor, is used for determining amplification quantity and steady operation.

Output terminal 6 pin of amplifier T2 link to each other with analog comparator anode 12 pin in the central processor CPU, and analog comparator negative terminal 13 pin are connected to the charge circuit of being made up of resistance R 6 and capacitor C1.Be connected to the clock concussion loop of forming by crystal oscillator JZ and capacitor C2, C3 between 4 pin of central processor CPU, 5 pin.Be connected to hummer LB between input/output port 14 pin of central processor CPU and positive source, be connected to resistance R 7 and light emitting diode LD1 between input/output port 15 pin of central processor CPU and positive source.The input/output port of central processing unit is connected to nixie display SM1 and SM2, this two nixie displaies SM1 and SM2 0, A, B, C, D, E, F, G pin be connected on respectively on the input/ output port 18,19,2～9 and 11 pin of central processing unit accordingly.10 pin of central processor CPU and 20 pin join with the negative pole and the positive pole of power supply respectively.Be connected to button A1, A2 respectively between input/ output port 16,17 pin of central processing unit and ground, give alarming value and alarming value, change mode of operation (as work time close display) etc. as the switch of power supply, input.

During work, have or not combustibility, toxic gas by gas sensor N1 detection.When combustibility, toxic gas, by gas sensor N1 these gases are converted to micro-voltage signal, this trace voltage signal is sent into the analog input anode of central processor CPU after amplifier T2 amplifies.Under the initial state, 13 pin of central processor CPU are input low level, and capacitor C1 is in discharge condition.When beginning to detect, 13 pin of central processor CPU are made as three-state (being high impedance), start the interruption sum counter of analog comparator simultaneously.As time goes on, the voltage on the capacitor C1 progressively raises, and the numeral of counter constantly increases.When the voltage on the capacitor C1 is higher than the output voltage of amplifier T2, the analog comparator of central processor CPU (PB1 and+PB0) produce to interrupt, stop counting immediately, 13 pin that make central processing unit are output low level, and the capacitor discharge is also prepared next time and detected.Numerical value on the read-out counter, this numerical value are proportional to the magnitude of voltage of amplifier T2 output.Utilize central processor CPU to correct linearity and the adding temperature compensation of gas sensor N1 again, calculate pre-alarm value and alarming value, control output state with this according to setting value.

Claims (1)

1. can place combustibility, toxic gas detection warning device in the safety helmet, it is characterized in that constituting by gas sensor (N1), amplifier (T2), central processing unit (CPU), nixie display (SM1, SM2), audible-visual annunciator and power supply (DC); The positive and negative end of gas sensor device (N1) joins with positive input terminal 3 pin of amplifier (T2) and ground respectively, is connected to resistance (R2) between its positive and negative end; Negative input end 2 pin of amplifier (T2) are connected to resistance (R4 and R3) respectively with the positive interpolar of ground and power supply (DC), are connected to resistance (R1 and R5) respectively between the positive interpolar of the anode of gas sensor (N1) and power supply (DC), negative input end 2 pin of amplifier (T2) and its output terminal 6 pin; Analog comparator anode 12 pin in output terminal 6 pin of amplifier (T2) and the central processing unit (CPU) link to each other, and analog comparator negative terminal 13 pin are connected to the charge circuit of being made up of resistance (R6) and capacitor (C1); Be connected to the clock oscillation loop of forming by crystal oscillator (JZ) and two capacitors (C2 and C3) between 4,5 pin of central processing unit (CPU); The positive interpolar of central processing unit (CPU) input/output port 14,15 pin and power supply (DC) is connected to hummer (LB) and light emitting diode (LD1) respectively; Also be connected to nixie display (SM1 and SM2) on the delivery outlet of central processing unit (CPU), this two nixie display 0, A, B, C, D, E, F, G pin be connected on respectively on the input/output port 18,19,2～9 and 11 pin of central processing unit (CPU) accordingly; Be connected to button (A1, A2) respectively between input/output port 16,17 pin of central processing unit (CPU) and ground.

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