CN109406722A - A kind of gas detecting system based on pneumatic detection - Google Patents
A kind of gas detecting system based on pneumatic detection Download PDFInfo
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- CN109406722A CN109406722A CN201811125003.2A CN201811125003A CN109406722A CN 109406722 A CN109406722 A CN 109406722A CN 201811125003 A CN201811125003 A CN 201811125003A CN 109406722 A CN109406722 A CN 109406722A
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- 238000001514 detection method Methods 0.000 title claims abstract description 140
- 239000002341 toxic gas Substances 0.000 claims abstract description 127
- 239000007789 gas Substances 0.000 claims abstract description 89
- 238000000034 method Methods 0.000 claims abstract description 10
- 239000003990 capacitor Substances 0.000 claims description 35
- 238000001914 filtration Methods 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 9
- 230000002159 abnormal effect Effects 0.000 claims description 6
- 230000003321 amplification Effects 0.000 claims description 6
- 230000006698 induction Effects 0.000 claims description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 5
- 231100000614 poison Toxicity 0.000 claims description 5
- 230000007096 poisonous effect Effects 0.000 claims description 4
- 239000008186 active pharmaceutical agent Substances 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000000007 visual effect Effects 0.000 claims description 3
- 231100000331 toxic Toxicity 0.000 claims description 2
- 230000002588 toxic effect Effects 0.000 claims description 2
- 238000009434 installation Methods 0.000 abstract description 5
- 238000011065 in-situ storage Methods 0.000 abstract description 2
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 6
- 230000008901 benefit Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/004—CO or CO2
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention discloses a kind of gas detecting systems based on pneumatic detection, including control unit, detection unit, alarm unit and execution unit, the present invention is not only with the mode of detection poison gas inside pipeline, while also in such a way that outlet detects poison gas and increasing pneumatic sensor, not only installation cost has been saved, but also has prevented false alarm and fails to report alert generation；Existing gas detection sensor needs 20 seconds preheating process, by providing preheating control section in the present invention, preheating time is shortened, preheating time was shortened within 5 seconds, the work waiting time is shortened, solves the false alarm phenomenon being likely to occur；Furthermore the present invention is additionally provided with remote alarming device, so that can also obtain the support of general headquarters in time while in-situ processing, not only improve the speed of handling problems, but also prevent the expansion of the state of affairs.
Description
Technical field
The present invention relates to a kind of gas detecting systems based on pneumatic detection, belong to field of gas detection.
Background technique
Currently, there is the purification of toxic gas and discharge process in the production process in chemical plant.It is now main in the market
The processing mode of stream carries out multiple spot installation, when tested gas componant (such as formaldehyde one is will test head installation in the duct
Deng) reach a certain concentration when, controller sounds an alarm, and closes corresponding valve；Another processing mode is to will test head to put
It is placed in the position of exhaust gas discharge, when tested gas componant (such as formaldehyde) reaches a certain concentration, controller is sounded an alarm, and
Close corresponding valve.First method, due to being installed in pipeline, measuring accuracy is high, still, since multiple spot is installed, at
This height is also easy in the detection process, due to the flowability problem of pipeline gas, it may appear that wrong report, failing to report phenomenon.At second
Reason mode, it is relatively low on installation cost, but belong to subsequent passive detection, one it is found that alarm, than later, and goes out
The case where now failing to report also is compared more.
Summary of the invention
For overcome the deficiencies in the prior art, the present invention provides a kind of gas detecting systems based on pneumatic detection.
In order to achieve the above object, the invention adopts the following technical scheme: a kind of gas detection system based on pneumatic detection
System, the gas detecting system are used to detect the toxic gas in pipeline, it is characterised in that: including control unit, detection unit, report
Alert unit and execution unit；Described control unit controls with detection unit, alarm unit and execution unit connect respectively, and detection is single
Member detects in pipeline and the air-flow and toxic gas of pipe outlet, and will test result and pass to control unit, control unit
Whether analysis detection result is abnormal, and when for abnormal results, control unit gives alarm unit and execution unit to send signal simultaneously,
Alarm unit and execution unit execute respective action respectively；The detection unit includes pipeline gas flow detector, pipeline
Toxic gas detection device and outlet toxic gas detection device, the pipeline gas flow detector are mounted in pipeline,
For the gas flowing in induction pipe, the pipeline toxic gas detection device is mounted in pipeline, in induction pipe
Toxic gas, the outlet toxic gas detection device is mounted on pipe outlet, for incuding the toxic gas in exit；Institute
Stating alarm unit includes acoustic-optic alarm and remote alarming device, and the acoustic-optic alarm is arranged beside pipeline, is used for
The warning reminding of sound and light is carried out to the staff at scene, the remote alarming device is arranged in master control room, is used for
Staff into master control room carries out warning reminding, to be helped in time；The execution unit includes solenoid valve and row
Gas fan, the solenoid valve is mounted in the pipeline in pipeline toxic gas detection device downstream side, for blocking pipe to have prevented
Poisonous gas is by pipeline, and the exhaust fan is mounted on pipe outlet, for dispersing the toxic gas in exit.
Preferably, being additionally provided with hand-operated valve in the pipeline, the hand-operated valve is located at the downstream of solenoid valve, and manages
Road gas flow detector, pipeline toxic gas detection device are between hand-operated valve and solenoid valve.
Preferably, described control unit selects single-chip microcontroller comprising power port, input port and output port, institute
After stating power port and power supply connection, described control unit is filled to pipeline toxic gas detection device and outlet toxic gas detection
It sets and carries out pre-add thermal control；The input port is connect with detection unit, for receiving the signal of detection unit conduction；It is described defeated
Exit port is connect with alarm unit and execution unit respectively, for by the instruction of single-chip microcontroller be transferred to alarm unit carry out alarm or
Execution unit carries out corresponding counter-measure.
Preferably, the pipeline gas flow detector includes pneumatic sensor, the pneumatic sensor is mounted on
The intensive position of air in pipeline flow velocity, when the pneumatic sensor has detected that gas flows and wind speed is not less than 1m/s, to
Control unit transmits high level signal, and described control unit sends instruction to alarm unit and execution unit；The pneumatic sensing
When gas flowing or wind speed is not detected less than 1m/s in device, low level signal is transmitted to control unit.
Preferably, the pipeline toxic gas detection device includes detection of poison gas sensor I, in detection of poison gas sensor
The alarm threshold value of target toxic gas and target toxic gas is set in I；The detection of poison gas sensor I is mounted on the pipe
Beside road gas flow detector, when the detection of poison gas sensor I detects target toxic gas and reaches alarm threshold value,
High level signal is transmitted to control unit, described control unit sends instruction to alarm unit and execution unit；The poison gas inspection
When survey sensor I is not detected target toxic gas or does not reach alarm threshold value, low level signal is transmitted to control unit.
Preferably, the outlet toxic gas detection device includes detection of poison gas sensor II, sensed in detection of poison gas
The alarm threshold value of target toxic gas and target toxic gas is set in device II；The detection of poison gas sensor II is mounted on pipe
Road gas outlet, it is single to control when the detection of poison gas sensor II detects target toxic gas and reaches alarm threshold value
Member transmission high level signal, described control unit send instruction to alarm unit and execution unit；The detection of poison gas sensor
II when being not detected target toxic gas or not reaching alarm threshold value, transmits low level signal to control unit.
Preferably, being believed between described control unit and remote alarming device by wireless WIFI chip and antenna transmission
Number.
Preferably, this gas detecting system uses a kind of specific circuit structure, a kind of specific circuit knot is used
Structure, it is characterised in that: including detection circuit, control circuit, warning circuit and power circuit, the control circuit respectively with detection
Circuit, warning circuit are connected with power circuit.
Preferably, the detection circuit include pipeline gas flow detection circuit, pipeline toxic gas detection circuit and
Exit gas detection circuit, the pipeline gas flow detection circuit include pneumatic sensor, operational amplifier IC1, partial pressure electricity
Road resistance R1, power amplifier Pa1, the feedback loop resistance R2 of comparator, triode biasing resistor R5, triode input
The pull-up resistor R6 of resistance R4 and triode, the pneumatic sensor select ptc material, and operational amplifier IC1 is as comparator
It uses, voltage divider circuit Resistance R1 and Pa1 form bleeder circuit, provide a stable comparison voltage, pneumatic sensing to comparator
The performance loop of the performance loop resistance R3 of head and sensor composition sensor, after pneumatic sensor detects signal, comparator
Its signal is compared with comparison voltage, then exports a signal, provides a high and low electricity to single-chip microcontroller by triode
Ordinary mail number；The pipeline toxic gas detection circuit includes I MQ1 of detection of poison gas sensor, operational amplifier IC2, bleeder circuit
Resistance R7, power amplifier Pa2, the feedback loop R8 of comparator, performance loop resistance R9, triode biasing resistor R 11,
The input resistance R10 of the triode and pull-up resistor R12 of triode, operational amplifier IC2 are used as comparator, bleeder circuit
Resistance R7 and power amplifier Pa2 forms bleeder circuit, provides a stable comparison voltage, detection of poison gas sensing to comparator
Device I MQ1 and performance loop resistance R9 form sensor performance loop, after gas sensor detects signal, comparator by its
Signal is compared with comparison voltage, then exports a signal, is provided a high and low level to single-chip microcontroller by triode and is believed
Number；The exit gas detection circuit include II MQ2 of detection of poison gas sensor, operational amplifier IC3, voltage divider circuit Resistance R13,
Power amplifier Pa3, performance loop resistance R15, the feedback loop R14 of comparator, triode biasing resistor R17, triode
Input resistance R16 and triode pull-up resistor R18 composition, operational amplifier IC3 uses as comparator, and bleeder circuit is electric
It hinders R13 and power amplifier Pa3 and forms bleeder circuit, provide a stable comparison voltage, detection of poison gas sensing to comparator
Device II MQ2 and performance loop resistance R15 form the performance loop of sensor, and after gas sensor detects signal, comparator will
Its signal is compared with comparison voltage, then exports a signal, provides a high and low level to single-chip microcontroller by triode
Signal.
Preferably, the control circuit includes single-chip microcontroller IC4 and pre-add thermal control circuit, the single-chip microcontroller IC4 is selected
80 series monolithics, including power port, input port and output port, capacitor C9, capacitor C10 and capacitor R19 group
At the working frequency part of single-chip microcontroller；Pre-add thermal control circuit is used for the preheating control process, including three pole of power amplification
Pipe Q4, power amplification triode Q5, triode input resistance R22, triode input resistance R26, triode pull-up resistor R23,
Triode pull-up resistor R27, triode pull-up resistor R25, triode pull-up resistor R29, triode current limliting divider resistance R24
With the current limliting divider resistance R28 of triode, which provides control signal by single-chip microcontroller, completes the preheating of gas sensor
Function.
Preferably, the warning circuit includes, power drive triode Q8, power drive triode Q9, triode are defeated
Enter resistance R20, triode input resistance R21, aerial drainage protection diode D1, aerial drainage protection diode D2, single channel normally opened relay
RELAY1, single channel normally opened relay RELAY2, visual alarm DS, voice guard MK, solenoid valve P T and exhaust fan FS, should
Circuit part is that after single-chip microcontroller issues alarm command, the disconnection and closure of relay are controlled by triode, controls light, sound
The working condition of sound, solenoid valve and exhaust fan.
Preferably, the power circuit includes power supply DY1, power supply DY2, power supply DY3, polarity protection diode D3, pole
Property protection diode D4, polarity protection diode D5, high-frequency filter capacitor C1, high-frequency filter capacitor C3, high-frequency filter capacitor C5,
High-frequency filter capacitor C7 is high-frequency filter capacitor, low frequency filtering capacitor C2, low frequency filtering capacitor C4, low frequency filtering capacitor C6 and low
Frequency filter capacitor C8, DY1 provide 28V benchmark, and DY2 provides 5V benchmark, and DY3 provides 3.3V benchmark.
The utility model has the advantages that compared with prior art, the invention has the following advantages that the present invention is not detected only with inside pipeline
The mode of poison gas, while in such a way that outlet detects poison gas and pneumatic sensor also is increased, installation cost has both been saved,
It also prevents false alarm and fails to report alert generation；Existing gas detection sensor needs 20 seconds preheating process, the present invention
In by providing preheating control section, shorten preheating time, preheating time was shorten to from original 20 seconds 5 seconds with
It is interior, the time of work waiting is shortened, solves the false alarm phenomenon being likely to occur；Furthermore the present invention is also devised with remote alarms
Device had not only improved the speed of handling problems, but also anti-so that can also obtain the support of general headquarters in time while in-situ processing
The expansion of the state of affairs is stopped.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the working principle of the invention figure；
The position Fig. 3 circuit structure diagram of the invention；
Wherein, 1, solenoid valve, 2, hand-operated valve, 3, exhaust fan, 4, pneumatic sensor, 5, detection of poison gas sensor I, 6, detection of poison gas
Sensor II, 7, remote alarming device, 8, acoustic-optic alarm.
Specific embodiment
In the following with reference to the drawings and specific embodiments, the present invention is furture elucidated, it should be understood that these embodiments are merely to illustrate
It the present invention rather than limits the scope of the invention, after the present invention has been read, those skilled in the art are to of the invention each
The modification of kind equivalent form falls within the application range as defined in the appended claims.
As shown in Fig. 1-3, a kind of gas detecting system based on pneumatic detection, the gas detecting system is used for detection pipe
Toxic gas in road, including control unit, detection unit, alarm unit and execution unit；Control unit is single with detection respectively
Member, alarm unit and execution unit control connection, detection unit detects in pipeline and the air-flow and toxic gas of pipe outlet,
And will test result and pass to control unit, whether control unit analysis detection result is abnormal, and when for abnormal results, control is single
Member sends signal to alarm unit and execution unit simultaneously, and alarm unit and execution unit execute respective action respectively；Control is single
Member selects single-chip microcontroller, is mainly made of power port, input port and output port, and control unit is for receiving sensor
Signal controls solenoid valve 1, alarm sound and flash of light and is remotely controlled, and input port is for receiving detection unit conduction
Signal, output port, which is used to for the instruction of single-chip microcontroller being transferred to alarm unit, to carry out alarm or execution unit and is answered accordingly
To measure, in addition, control unit is also preheated to pipeline toxic gas detection device and outlet toxic gas detection device
Control.Too long for the preheating time of detection of poison gas sensor, normal preheating time 20 seconds, practice affects behaviour in operating
Make progress, will also result in detection of poison gas and fail to report police.The present invention powers on quickly heating and steady by the control of single-chip microcontroller, using initial stage
The method of low-power heating, preheating time is shortened to 5 seconds, greatly reduces and fails to report alert probability after fixed.
Detection unit includes pipeline gas flow detector, pipeline toxic gas detection device and outlet toxic gas inspection
Device is surveyed, pipeline gas flow detector is used for for the gas flowing in induction pipe, pipeline toxic gas detection device
Toxic gas in induction pipe, outlet toxic gas detection device are used to incude the toxic gas in exit；Pipeline gas stream
Motion detection device includes pneumatic sensor 4, and pneumatic sensor 4 is mounted on the biggish position of air in pipeline flow velocity, pneumatic sensing
Device 4 detected gas flowing and when wind speed is not less than 1m/s, transmits high level signal to control unit, and control unit is to alarm
Unit and execution unit send instruction；When gas flowing or wind speed is not detected lower than 1m/s in pneumatic sensor 4, to control unit
Transmit low level signal.Pipeline toxic gas detection device includes detection of poison gas sensor I 5, and detection of poison gas sensor I 5 is installed
Beside pipeline gas flow detector, detection of poison gas sensor I 5 detects target toxic gas and reaches alarm threshold value
When, high level signal is transmitted to control unit, control unit sends instruction to alarm unit and execution unit；Detection of poison gas sensing
When device I 5 is not detected target toxic gas or does not reach alarm threshold value, low level signal is transmitted to control unit.Outlet has
Poisonous gas detection device includes detection of poison gas sensor II 6, and detection of poison gas sensor II 6 is mounted on pipeline gas exit, poison
When gas detection sensor II 6 detects target toxic gas and reaches alarm threshold value, high level signal, control are transmitted to control unit
Unit processed sends instruction to alarm unit and execution unit；Detection of poison gas sensor II 6 is not detected target toxic gas or does not have
Have when reaching alarm threshold value, transmits low level signal to control unit.
Alarm unit includes acoustic-optic alarm 8 and remote alarming device 7, and acoustic-optic alarm 8 is used for the work to scene
Make the warning reminding that personnel carry out sound and light, staff of the remote alarming device 7 for into master control room alarms
It reminds, to be helped in time；Pass through wireless WIFI chip and antenna transmission between control unit and remote alarming device 7
Signal.
Execution unit includes solenoid valve 1 and exhaust fan 3, and solenoid valve 1 is for blocking pipe to prevent toxic gas from passing through pipe
Road, exhaust fan 3 are used to disperse the toxic gas in exit.During the work time, gas flows in the duct, when not having in pipeline
When detecting toxic component gas, solenoid valve 1 is conducting, and when detecting toxic gas, control unit issues instruction, is closed
Solenoid valve 1 is closed, and issues sound-light alarm and remote alarms.In exit there are also installed detection of poison gas sensor, when having detected
When poisonous gas, control unit issues instruction, opens exhaust fan 3, and issue sound-light alarm and remote alarms.It is additionally provided in pipeline
Hand-operated valve 2, hand-operated valve 2 are located at the downstream of solenoid valve 1, and pipeline gas flow detector, pipeline toxic gas detection
Device is between hand-operated valve 2 and solenoid valve 1.
In circuit structure diagram as shown in Figure 3, including detection circuit, control circuit, warning circuit and power circuit, it is described
Control circuit is connect with detection circuit, warning circuit and power circuit respectively.
Preferably, the detection circuit include pipeline gas flow detection circuit, pipeline toxic gas detection circuit and
Exit gas detection circuit, the pipeline gas flow detection circuit include pneumatic sensor, operational amplifier IC1, partial pressure electricity
Road resistance R1, power amplifier Pa1, the feedback loop resistance R2 of comparator, triode biasing resistor R5, triode input
The pull-up resistor R6 of resistance R4 and triode, the pneumatic sensor select ptc material, and operational amplifier IC1 is as comparator
It uses, voltage divider circuit Resistance R1 and Pa1 form bleeder circuit, provide a stable comparison voltage, pneumatic sensing to comparator
The performance loop of the performance loop resistance R3 of head and sensor composition sensor, after pneumatic sensor detects signal, comparator
Its signal is compared with comparison voltage, then exports a signal, provides a high and low electricity to single-chip microcontroller by triode
Ordinary mail number；The pipeline toxic gas detection circuit includes I MQ1 of detection of poison gas sensor, operational amplifier IC2, bleeder circuit
Resistance R7, power amplifier Pa2, the feedback loop R8 of comparator, performance loop resistance R9, triode biasing resistor R 11,
The input resistance R10 of the triode and pull-up resistor R12 of triode, operational amplifier IC2 are used as comparator, bleeder circuit
Resistance R7 and power amplifier Pa2 forms bleeder circuit, provides a stable comparison voltage, detection of poison gas sensing to comparator
Device I MQ1 and performance loop resistance R9 form sensor performance loop, after gas sensor detects signal, comparator by its
Signal is compared with comparison voltage, then exports a signal, is provided a high and low level to single-chip microcontroller by triode and is believed
Number；The exit gas detection circuit include II MQ2 of detection of poison gas sensor, operational amplifier IC3, voltage divider circuit Resistance R13,
Power amplifier Pa3, performance loop resistance R15, the feedback loop R14 of comparator, triode biasing resistor R17, triode
Input resistance R16 and triode pull-up resistor R18 composition, operational amplifier IC3 uses as comparator, and bleeder circuit is electric
It hinders R13 and power amplifier Pa3 and forms bleeder circuit, provide a stable comparison voltage, detection of poison gas sensing to comparator
Device II MQ2 and performance loop resistance R15 form the performance loop of sensor, and after gas sensor detects signal, comparator will
Its signal is compared with comparison voltage, then exports a signal, provides a high and low level to single-chip microcontroller by triode
Signal.
Preferably, the control circuit includes single-chip microcontroller IC4 and pre-add thermal control circuit, the single-chip microcontroller IC4 is selected
80 series monolithics, including power port, input port and output port, capacitor C9, capacitor C10 and capacitor R19 group
At the working frequency part of single-chip microcontroller；Pre-add thermal control circuit is used for the preheating control process, including three pole of power amplification
Pipe Q4, power amplification triode Q5, triode input resistance R22, triode input resistance R26, triode pull-up resistor R23,
Triode pull-up resistor R27, triode pull-up resistor R25, triode pull-up resistor R29, triode current limliting divider resistance R24
With the current limliting divider resistance R28 of triode, which provides control signal by single-chip microcontroller, completes the preheating of gas sensor
Function.
Preferably, the warning circuit includes, power drive triode Q8, power drive triode Q9, triode are defeated
Enter resistance R20, triode input resistance R21, aerial drainage protection diode D1, aerial drainage protection diode D2, single channel normally opened relay
RELAY1, single channel normally opened relay RELAY2, visual alarm DS, voice guard MK, solenoid valve P T and exhaust fan FS, should
Circuit part is that after single-chip microcontroller issues alarm command, the disconnection and closure of relay are controlled by triode, controls light, sound
The working condition of sound, solenoid valve and exhaust fan.
Preferably, the power circuit includes power supply DY1, power supply DY2, power supply DY3, polarity protection diode D3, pole
Property protection diode D4, polarity protection diode D5, high-frequency filter capacitor C1, high-frequency filter capacitor C3, high-frequency filter capacitor C5,
High-frequency filter capacitor C7 is high-frequency filter capacitor, low frequency filtering capacitor C2, low frequency filtering capacitor C4, low frequency filtering capacitor C6 and low
Frequency filter capacitor C8, DY1 provide 28V benchmark, and DY2 provides 5V benchmark, and DY3 provides 3.3V benchmark.
The present invention increases pneumatic sensor in pipeline using pipeline and outlet two-way detection of poison gas all the way.By pneumatic biography
Sensor and detection of poison gas sensor are placed in ventilation in pipeline together, when the flowing of no gas, detection of poison gas sensing
The signal of device is shielded, and is not in false alarm phenomenon, and when there is gas flowing, pneumatic sensor issues signal, once occur
Toxic gas simultaneously reaches alarm threshold value, and controller issues audible and visible alarm, and closes solenoid valve, and gas is truncated, finds out to personnel
Reason, restarting systems can just work on.Detection of poison gas sensor in exit, once detect object gas
Concentration reaches alarm threshold value, immediately sounds an alarm, and opens fan, and toxic gas is blown away.On the one hand this processing method is
It solves in pipeline due to not having under flowing gas state, when multiple spot is installed as caused by the toxic gas remaining of individual points
False alarm also solves the detection in gas flowing, installs without multiple spot, thus save the cost.On the other hand, increase in outlet
Add and detect all the way, and in the state of thering is release of toxic gas to come out, carries out alarm and gas evacuation, prevent that personnel are caused to hurt
Evil.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (10)
1. a kind of gas detecting system based on pneumatic detection, which is used to detect the toxic gas in pipeline,
It is characterized by comprising control unit, detection unit, alarm unit and execution units；
Described control unit controls with detection unit, alarm unit and execution unit connect respectively, and detection unit detects in pipeline
And the air-flow and toxic gas of pipe outlet, and will test result and pass to control unit, control unit analysis detection result
Whether abnormal, when for abnormal results, control unit gives alarm unit and execution unit transmission signal simultaneously, alarm unit with hold
Row unit executes respective action respectively；
The detection unit includes pipeline gas flow detector, pipeline toxic gas detection device and outlet toxic gas inspection
Device is surveyed, the pipeline gas flow detector is mounted in pipeline, for the gas flowing in induction pipe, the pipeline
Toxic gas detection device is mounted in pipeline, for the toxic gas in induction pipe, the outlet toxic gas detection dress
It sets and is mounted on pipe outlet, for incuding the toxic gas in exit；
The alarm unit includes acoustic-optic alarm and remote alarming device, and the acoustic-optic alarm is arranged by pipeline
Side, the warning reminding of sound and light is carried out for the staff to scene, and the remote alarming device is arranged in master control room
It is interior, warning reminding is carried out for the staff into master control room, to be helped in time；
The execution unit includes solenoid valve and exhaust fan, and the solenoid valve is mounted on pipeline toxic gas detection device downstream side
Pipeline in, for blocking pipe, to prevent toxic gas, the exhaust fan is mounted on pipe outlet, for dispersing by pipeline
Toxic gas in exit.
2. gas detecting system according to claim 1, it is characterised in that: be additionally provided with hand-operated valve, institute in the pipeline
The downstream that hand-operated valve is located at solenoid valve is stated, and pipeline gas flow detector, pipeline toxic gas detection device are located at
Between hand-operated valve and solenoid valve.
3. gas detecting system according to claim 1, it is characterised in that: described control unit selects single-chip microcontroller, packet
Power port, input port and output port are included, after the power port and power supply are connected, described control unit is toxic to pipeline
Gas-detecting device and outlet toxic gas detection device carry out pre-add thermal control；The input port is connect with detection unit,
For receiving the signal of detection unit conduction；The output port is connect with alarm unit and execution unit respectively, and being used for will be single
The instruction of piece machine is transferred to alarm unit and carries out alarm or the corresponding counter-measure of execution unit progress.
4. gas detecting system according to claim 1, it is characterised in that: the pipeline gas flow detector includes
Pneumatic sensor, the pneumatic sensor are mounted on the intensive position of air in pipeline flow velocity, and the pneumatic sensor detects
There is gas to flow and when wind speed is not less than 1m/s, transmit high level signal to control unit, described control unit is to alarm unit
It sends and instructs with execution unit；When gas flowing or wind speed is not detected less than 1m/s in the pneumatic sensor, to control unit
Transmit low level signal.
5. gas detecting system according to claim 1, it is characterised in that: the pipeline toxic gas detection device includes
The warning level of target toxic gas and target toxic gas is arranged in detection of poison gas sensor I in detection of poison gas sensor I
Value；The detection of poison gas sensor I is mounted on beside the pipeline gas flow detector, the detection of poison gas sensor I
When detecting target toxic gas and reaching alarm threshold value, high level signal is transmitted to control unit, described control unit is to report
Alert unit and execution unit send instruction；The detection of poison gas sensor I is not detected target toxic gas or does not reach report
When alert threshold value, low level signal is transmitted to control unit.
6. gas detecting system according to claim 1, it is characterised in that: the outlet toxic gas detection device includes
The warning level of target toxic gas and target toxic gas is arranged in detection of poison gas sensor II in detection of poison gas sensor II
Value；The detection of poison gas sensor II is mounted on pipeline gas exit, and the detection of poison gas sensor II detects that target has
Poisonous gas and when reaching alarm threshold value transmits high level signal to control unit, and described control unit is to alarm unit and execution
Unit sends instruction；When the detection of poison gas sensor II is not detected target toxic gas or does not reach alarm threshold value, to
Control unit transmits low level signal.
7. gas detecting system according to claim 1, it is characterised in that: described control unit and remote alarming device it
Between pass through wireless WIFI chip and antenna transmission signal.
8. any gas detecting system according to claim 1-7, uses a kind of specific circuit structure, feature
Be: including detection circuit, control circuit, warning circuit and power circuit, the control circuit respectively with detection circuit, alarm
Circuit is connected with power circuit；
The detection circuit includes pipeline gas flow detection circuit, pipeline toxic gas detection circuit and exit gas detection electricity
Road,
The pipeline gas flow detection circuit includes pneumatic sensor, operational amplifier IC1, voltage divider circuit Resistance R1, power
Amplifier Pa1, the feedback loop resistance R2 of comparator, the biasing resistor R5 of triode, the input resistance R4 of triode and three poles
The pull-up resistor R6 of pipe, the pneumatic sensor select ptc material, and operational amplifier IC1 is used as comparator, bleeder circuit
Resistance R1 and Pa1 form bleeder circuit, provide a stable comparison voltage, the work of pneumatic sensing head and sensor to comparator
Make the performance loop of loop resistance R3 composition sensor, after pneumatic sensor detects signal, comparator is by its signal compared with
Voltage is compared, and then exports a signal, provides a high and low level signal to single-chip microcontroller by triode；
The pipeline toxic gas detection circuit includes I MQ1 of detection of poison gas sensor, operational amplifier IC2, voltage divider circuit Resistance
R7, power amplifier Pa2, the feedback loop R8 of comparator, performance loop resistance R9, the biasing resistor R 11 of triode, three poles
The input resistance R10 of the pipe and pull-up resistor R12 of triode, operational amplifier IC2 are used as comparator, voltage divider circuit Resistance
R7 and power amplifier Pa2 forms bleeder circuit, provides a stable comparison voltage, detection of poison gas sensor I to comparator
The performance loop of MQ1 and performance loop resistance R9 composition sensor, after gas sensor detects signal, comparator is by its signal
It is compared with comparison voltage, then exports a signal, provide a high and low level signal to single-chip microcontroller by triode；
The exit gas detection circuit includes II MQ2 of detection of poison gas sensor, operational amplifier IC3, voltage divider circuit Resistance
R13, power amplifier Pa3, performance loop resistance R15, the feedback loop R14 of comparator, the biasing resistor R17 of triode, three
The input resistance R16 of pole pipe and the pull-up resistor R18 composition of triode, operational amplifier IC3 are used as comparator, partial pressure electricity
Road resistance R13 and power amplifier Pa3 form bleeder circuit, provide a stable comparison voltage, detection of poison gas to comparator
Sensor II MQ2 and performance loop resistance R15 form the performance loop of sensor, after gas sensor detects signal, compare
Its signal is compared by device with comparison voltage, then exports a signal, high and low to single-chip microcontroller offer one by triode
Level signal；
The control circuit includes single-chip microcontroller IC4 and pre-add thermal control circuit,
The single-chip microcontroller IC4 selects 80 series monolithics, including power port, input port and output port, capacitor C9, electricity
The working frequency part of container C10 and capacitor R19 composition single-chip microcontroller；
Pre-add thermal control circuit is used for the preheating control process, including power amplification triode Q4, power amplification triode
Q5, triode input resistance R22, triode input resistance R26, triode pull-up resistor R23, triode pull-up resistor R27, three
The current limliting partial pressure electricity of pole pipe pull-up resistor R25, triode pull-up resistor R29, the current limliting divider resistance R24 of triode and triode
R28 is hindered, which provides control signal by single-chip microcontroller, complete the pre-add heat function of gas sensor.
9. gas detecting system according to claim 8, it is characterised in that: the warning circuit includes power drive three
Pole pipe Q8, power drive triode Q9, triode input resistance R20, triode input resistance R21, aerial drainage protection diode D1,
Aerial drainage protection diode D2, single channel normally opened relay RELAY1, single channel normally opened relay RELAY2, visual alarm DS, sound
Alarm MK, solenoid valve P T and exhaust fan FS, the circuit part are after single-chip microcontroller issues alarm command, to be controlled by triode
The disconnection and closure of relay, the working condition of control light, sound, solenoid valve and exhaust fan.
10. gas detecting system according to claim 8, it is characterised in that: the power circuit includes power supply DY1, electricity
Source DY2, power supply DY3, polarity protection diode D3, polarity protection diode D4, polarity protection diode D5, high-frequency filter capacitor
C1, high-frequency filter capacitor C3, high-frequency filter capacitor C5, high-frequency filter capacitor C7 are high-frequency filter capacitors, low frequency filtering capacitor C2,
Low frequency filtering capacitor C4, low frequency filtering capacitor C6 and low frequency filtering capacitor C8, DY1 provide 28V benchmark, and DY2 provides 5V benchmark,
DY3 provides 3.3V benchmark.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811125003.2A CN109406722A (en) | 2018-09-26 | 2018-09-26 | A kind of gas detecting system based on pneumatic detection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811125003.2A CN109406722A (en) | 2018-09-26 | 2018-09-26 | A kind of gas detecting system based on pneumatic detection |
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