CN109507276A - A kind of novel environmental air TVOC on-line monitoring system - Google Patents
A kind of novel environmental air TVOC on-line monitoring system Download PDFInfo
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- CN109507276A CN109507276A CN201811562076.8A CN201811562076A CN109507276A CN 109507276 A CN109507276 A CN 109507276A CN 201811562076 A CN201811562076 A CN 201811562076A CN 109507276 A CN109507276 A CN 109507276A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
- G01N27/64—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using wave or particle radiation to ionise a gas, e.g. in an ionisation chamber
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The present invention provides a kind of novel environmental air TVOC on-line monitoring system, it includes human-computer interaction module, control device and surrounding air TVOC monitoring gas circuit, and the surrounding air TVOC monitoring gas circuit includes wide range monitoring gas circuit and small-range monitoring gas circuit and gas path switching device；The human-computer interaction module is connect with the control device, is used for control device input function instruction and functional parameter；The control device controls the wide range monitoring gas circuit according to the function command and functional parameter and works, and controls the gas path switching device according to the environment TVOC value that the wide range monitors gas circuit monitoring and wide range monitoring gas circuit is switched to the small-range monitoring gas circuit；The human-computer interaction module also monitors gas circuit with the wide range respectively and the small-range monitors air circuit connection, for showing the environment TVOC value of wide range monitoring gas circuit or small-range monitoring gas circuit monitoring.
Description
Technical field
The present invention relates to a kind of surrounding air TVOC monitoring systems specifically to relate to a kind of novel environmental air
TVOC on-line monitoring system.
Background technique
With increasingly popularizing so that the TVOC content in surrounding air is more and more for industrial pollution and automobile, surrounding air
In TVOC can not only directly cause damages to human health, while can also interact, cause photochemical pollution.Therefore to ring
The fast and accurately monitoring of TVOC content seems more more and more urgent in the air of border.Since the TVOC content in surrounding air is in
Trace level, the equipment of existing monitoring TVOC content is realized using sensor technology mostly in the market, but due to sensor
The limitation of sensitivity and detection limit, the application range in air environment monitoring have very big limited.
In order to solve the above problems, people are seeking always a kind of ideal technical solution.
Summary of the invention
The purpose of the present invention is in view of the deficiencies of the prior art, thus provide it is a kind of have a wide range of application, measurement accuracy it is high
Novel environmental air TVOC on-line monitoring system.
To achieve the goals above, the technical scheme adopted by the invention is that: a kind of novel environmental air TVOC is supervised online
Examining system, including human-computer interaction module, control device and surrounding air TVOC monitor gas circuit, and the surrounding air TVOC monitors gas
Road includes the wide range monitoring gas circuit and small-range monitoring gas circuit for being respectively used to detection surrounding air TVOC value, and in institute
State the gas path switching device mutually switched between wide range monitoring gas circuit and small-range monitoring gas circuit；The human-computer interaction mould
Block is connect with the control device, is used for control device input function instruction and functional parameter；The control device root
The wide range monitoring gas circuit work is controlled according to the function command and functional parameter, and gas circuit prison is monitored according to the wide range
The environment TVOC value of survey controls the gas path switching device and wide range monitoring gas circuit is switched to the small-range monitoring gas
Road；The human-computer interaction module also monitors gas circuit with the wide range respectively and the small-range monitors air circuit connection, for showing
Show the environment TVOC value of wide range monitoring gas circuit or small-range monitoring gas circuit monitoring.
Based on above-mentioned, the gas path switching device is solenoid operated four-way valve, when the solenoid operated four-way valve powers off, the electromagnetism four
4th orifice of the first interface of port valve and the solenoid operated four-way valve, the second interface of the solenoid operated four-way valve and the electricity
The third orifice of magnetic four-way valve；When the solenoid operated four-way valve is powered, the first interface of the solenoid operated four-way valve and the electricity
4th interface of the third orifice of magnetic four-way valve, the second interface of the solenoid operated four-way valve and the solenoid operated four-way valve connects
It is logical；
The surrounding air TVOC monitoring gas circuit includes air inlet, sampling pump, thermal desorption tube, optic ionized sensor and exhaust
Mouthful, the air inlet, the sampling pump, the first interface of the solenoid operated four-way valve, the 4th interface of the solenoid operated four-way valve, institute
It states optic ionized sensor and the exhaust outlet is sequentially communicated the composition wide range monitoring gas circuit；The air inlet described is adopted
Sample pump, the first interface of the solenoid operated four-way valve, the second interface of the solenoid operated four-way valve, the thermal desorption tube, the electromagnetism
The third interface of four-way valve, the solenoid operated four-way valve the 4th interface, the optic ionized sensor and the exhaust outlet successively
Connection forms the small-range and monitors gas circuit；
The control device control connects the solenoid operated four-way valve, and the on-off by controlling the solenoid operated four-way valve is realized described big
Range monitors the switching of gas circuit and small-range monitoring gas circuit.
Based on above-mentioned, the gas path switching device includes the first three-way solenoid valve and the second three-way solenoid valve, and described first
Three-way solenoid valve and second three-way solenoid valve are identical three-way solenoid valve；When the three-way solenoid valve powers off, the electricity
The first interface of magnetic triple valve is connected to the third interface of the three-way solenoid valve；When the three-way solenoid valve is connected, described second
The first interface of three-way solenoid valve is connected to the second interface of the three-way solenoid valve；
The surrounding air TVOC monitoring gas circuit includes air inlet, sampling pump, thermal desorption tube, optic ionized sensor and exhaust
Mouthful, the air inlet, the sampling pump, the first interface of first three-way solenoid valve, first three-way solenoid valve the
Three interfaces, the third interface of second three-way solenoid valve, the first interface of second three-way solenoid valve, the photoionization
Sensor and the exhaust outlet are sequentially communicated the composition wide range monitoring gas circuit；
The air inlet, the sampling pump, the first interface of first three-way solenoid valve, the three-way solenoid valve second connect
Mouth, the thermal desorption tube, the second interface of second three-way solenoid valve, the first interface of the three-way solenoid valve, the light
Ionization sensor and the exhaust outlet are sequentially communicated the composition small-range monitoring gas circuit；
Control device control connects first three-way solenoid valve and second three-way solenoid valve, by controlling described the
The on-off of one three-way solenoid valve and second three-way solenoid valve realizes the wide range monitoring gas circuit and small-range monitoring
The switching of gas circuit.
Based on above-mentioned, the control device includes MCU main control module, temperature control module, data transmission module and power module,
The temperature control module is used to adjust the temperature of the gas path switching device, the thermal desorption tube and gas circuit pipeline；The data pass
Defeated module is for realizing data transmission；The MCU main control module respectively with the temperature control module, the data transmission module, institute
Sampling pump is stated to connect with the gas path switching device, the power module respectively with the MCU main control module, the temperature control mould
Block, the data transmission module, the gas path switching device are connected with the sampling pump, for providing working power.
Based on above-mentioned, the temperature control module includes temperature detecting unit, processor unit, heating unit and refrigeration unit,
The temperature detecting unit includes three-wire system PT100 platinum resistance, amplifier AD620 and multichannel digital analog converter, three line
PT100 platinum resistance processed is used to be converted to temperature signal analog voltage signal, and the amplifier AD620 is for amplifying the simulation
Voltage signal, the multichannel digital analog converter are used to convert digital voltage signal for the analog voltage signal；The place
Reason device unit is connect with the multichannel digital analog converter, the heating unit and the refrigeration unit respectively, according to the number
The word voltage signal control heating unit is heated or is controlled the refrigeration unit and freezed.
Based on above-mentioned, the monitoring step of the wide range monitoring gas circuit is as follows:
The MCU main control module controls the gas path switching device and disconnects, and controls the sampling pump and photoionization biography
Sensor powers on；
Environmental gas is pumped into from the air inlet, is sent into the photoionization through the sampling pump, the gas path switching device and is passed
Sensor detects environmental gas TVOC value through the optic ionized sensor.
Based on above-mentioned, the monitoring step of the small-range monitoring gas circuit is as follows:
The Concentration Sampling stage
The MCU main control module controls the gas path switching device and connects, and controls the sampling pump and photoionization biography
Sensor powers on；
Environmental gas is pumped into from the air inlet, through the sampling pump, gas path switching device, the thermal desorption tube, described
Optic ionized sensor is emptied from the exhaust outlet, and the TVOC in environmental gas, which is enriched with, to be adsorbed in the thermal desorption tube；
Heating period
The MCU main control module controls the gas path switching device and disconnects, and the heating unit for controlling the thermal desorption tube is opened,
So that the thermal desorption tube is rapidly heated and be stabilized to default high temperature value, the TVOC being enriched in the thermal desorption tube at this time is quick
It desorbs；
Parse the sample introduction stage
The MCU main control module controls the gas path switching device connection and controls the optic ionized sensor and powers on, at this time
Environmental gas enters the photoionization by the air inlet, the sampling pump, the gas path switching device, the thermal desorption tube
Sensor, the TVOC for being desorbed out in the thermal desorption tube also with environmental gas enter the optic ionized sensor into
Row content detection；
Cooling stages
The MCU main control module controls the gas path switching device and disconnects, and controls the sampling pump and photoionization biography
Sensor power-off, and the refrigeration unit for controlling the thermal desorption tube is opened, and is made the thermal desorption tube fast cooling and is stabilized to default
Low temperature value.
Based on above-mentioned, flow sensor, the MCU are additionally provided between the exhaust outlet and the optic ionized sensor
Main control module is connect with the flow sensor, controls the sampling pump according to the gas flow that the flow sensor acquires
Flow velocity is to realize accurate air inlet.
Based on above-mentioned, filter is additionally provided with after the air inlet, the filter is used to filter in surrounding air
Grain.
Based on above-mentioned, the sampling pump can also be arranged in front of the exhaust outlet.
The present invention has substantive distinguishing features outstanding and significant progressive, specifically, present invention benefit compared with the prior art
The detection technique building small-range monitoring combined with enrichment thermal desorption and optic ionized sensor, by traditional TVOC detecting instrument
Extended detection range to trace level, very good solution the lowest detection line of traditional TVOC detecting instrument and asking for sensitivity
Topic；And gas is monitored by realizing wide range according to the control gas path switching device containing amount control device of TVOC in environmental gas
The switching on road and small-range monitoring gas circuit, so that the application range of surrounding air TVOC on-line monitoring system is wider；Pass through control
Device processed control sampling pump, flow sensor realize the accurate and flexible acquisition of sample gas；The present invention has high sensitivity, inspection
Survey line is low, easy to maintain, the advantages of having a wide range of application.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the embodiment of the present invention 2.
Fig. 2 is the wide range monitoring gas circuit of the embodiment of the present invention 2.
Fig. 3 is the small-range monitoring gas circuit of the embodiment of the present invention 2.
Fig. 4 is control device schematic diagram of the invention.
Fig. 5 is the structural schematic diagram of the embodiment of the present invention 3.
Fig. 6 is the wide range monitoring gas circuit of the embodiment of the present invention 3.
Fig. 7 is the small-range monitoring gas circuit of the embodiment of the present invention 3.
Fig. 8 is a kind of structural schematic diagram of the embodiment of the present invention 5.
Fig. 9 is another structural schematic diagram of the embodiment of the present invention 5.
Figure 10 is a kind of structural schematic diagram of the embodiment of the present invention 6.
Figure 11 is another structural schematic diagram of the embodiment of the present invention 6.
Figure 12 is a kind of structural schematic diagram of the embodiment of the present invention 7.
Figure 13 is another structural schematic diagram of the embodiment of the present invention 7.
In figure: 1. air inlets；2. filter；3. sampling pump；4. solenoid operated four-way valve；5. thermal desorption tube；6. photoionization passes
Sensor；7. flow sensor；8. exhaust outlet；9. the first three-way solenoid valve；10. the second three-way solenoid valve.
Specific embodiment
Below by specific embodiment, technical scheme of the present invention will be described in further detail.
Embodiment 1
The present invention provides a kind of novel environmental air TVOC on-line monitoring system, including human-computer interaction module, control device and ring
Border air TVOC monitors gas circuit, it is preferred that the human-computer interaction module includes the units such as bar magnet and display screen, and the bar magnet is used to
The selection of function command and the setting of functional parameter are carried out in start-up phase.When the display screen is primarily used to show current
Between, the information such as the TVOC content value of the progress of current state information, current process and monitoring.
It is equipment self-inspection, meeting after self-test passes through first after novel environmental air TVOC on-line monitoring system booting powers on
Enter main interface, the function commands such as main interface is broadly divided into circulatory monitoring, calibration, historical data are checked and be arranged, calibration is again
It is divided into baseline calibration and characteristic point calibration, is all made of linear interpolation algorithm and is demarcated；Two magnetic on panel can be passed through at this time
The prompt information of stick combination display screen carries out the selection of function command and the setting of functional parameter.
The surrounding air TVOC monitoring gas circuit includes the wide range monitoring gas for being respectively used to detection surrounding air TVOC value
Road and small-range monitor gas circuit, and mutually cut between gas circuit and small-range monitoring gas circuit for monitoring in the wide range
The gas path switching device changed；The control device controls the wide range according to the function command and functional parameter and monitors gas circuit
Work, and the gas path switching device is controlled for the wide range according to the environment TVOC value that the wide range monitors gas circuit monitoring
Monitoring gas circuit switches to the small-range monitoring gas circuit；The human-computer interaction module also respectively with the wide range monitor gas circuit and
The small-range monitors air circuit connection, for showing the environment of wide range monitoring gas circuit or small-range monitoring gas circuit monitoring
TVOC value.
The working principle of the present embodiment are as follows:
The control device controls the wide range monitoring gas circuit work according to the function command and functional parameter, and according to institute
The environment TVOC value for stating wide range monitoring gas circuit monitoring controls the gas path switching device for wide range monitoring gas circuit switching
Gas circuit is monitored to the small-range；Specifically, when the environment TVOC value of wide range monitoring gas circuit monitoring is small-range (0-
1ppm), it is described small to switch to wide range monitoring gas circuit to control the gas path switching device movement for the control device
Range monitors gas circuit；When the environment TVOC value of wide range monitoring gas circuit monitoring is wide range (1ppm -40ppm), institute
It states the control device control gas path switching device to be failure to actuate, continues to execute the wide range monitoring gas circuit；The wide range prison
The environment TVOC value for surveying gas circuit or small-range monitoring gas circuit monitoring is shown by the human-computer interaction module.
The present invention according to the control gas path switching device containing amount control device of TVOC in environmental gas by realizing largely
Journey monitors the switching of gas circuit and small-range monitoring gas circuit, so that the application range of surrounding air TVOC on-line monitoring system is more
Extensively.
Embodiment 2
Be in place of the difference of the present embodiment and embodiment 1: as shown in Figure 1, surrounding air TVOC monitoring gas circuit include into
Port 1, sampling pump 3, thermal desorption tube 5, optic ionized sensor 6 and exhaust outlet 8, the gas path switching device are 4 electromagnetism four-ways
Valve, when the solenoid operated four-way valve 4 powers off, the first interface of the solenoid operated four-way valve 4 and the 4th interface of the solenoid operated four-way valve 4
Connection, the second interface of the solenoid operated four-way valve 4 and the third orifice of the solenoid operated four-way valve 4；The solenoid operated four-way valve 4
When energization, the first interface of the solenoid operated four-way valve 4 and the third orifice of the solenoid operated four-way valve 4, the electromagnetism four-way
4th orifice of the second interface of valve 4 and the solenoid operated four-way valve 4；
As shown in Fig. 2, the first interface of the air inlet 1, the sampling pump 3, the solenoid operated four-way valve 4, the electromagnetism four-way
The 4th interface, the optic ionized sensor 6 and the exhaust outlet 8 of valve 4 are sequentially communicated the composition wide range monitoring gas circuit.
As shown in figure 3, the first interface of the air inlet 1, the sampling pump 3, the solenoid operated four-way valve 4, the electromagnetism
The second interface of four-way valve 4, the thermal desorption tube 5, the third interface of the solenoid operated four-way valve 4, the solenoid operated four-way valve 4
Four interfaces, the optic ionized sensor 6 and the exhaust outlet 8 are sequentially communicated the composition small-range monitoring gas circuit.
The control device control connects the solenoid operated four-way valve 4, and the on-off by controlling the solenoid operated four-way valve 4 is realized
The switching of the wide range monitoring gas circuit and small-range monitoring gas circuit
Specifically, as shown in figure 4, the control device includes MCU main control module, temperature control module, data transmission module and power supply
Module, the temperature control module are used to adjust the temperature of the thermal desorption tube；The data transmission module is for realizing data transmission；
The MCU main control module switches with the temperature control module, the data transmission module, the sampling pump 3 and the gas circuit respectively
Device connection, the power module respectively with the MCU main control module, temperature control module, the data transmission module, described
Solenoid operated four-way valve 4 and the sampling pump 3 connect, for providing working power.
Specifically, the temperature control module includes temperature detecting unit, processor unit, heating unit and refrigeration unit, institute
Stating temperature detecting unit includes three-wire system PT100 platinum resistance, amplifier AD620 and multichannel digital analog converter, the three-wire system
PT100 platinum resistance is used to be converted to temperature signal analog voltage signal, and the amplifier AD620 is for amplifying the simulation electricity
Signal is pressed, the multichannel digital analog converter is used to convert digital voltage signal for the analog voltage signal；The processing
Device unit is connect with the multichannel digital analog converter, the heating unit and the refrigeration unit respectively, according to the number
The voltage signal control heating unit is heated or is controlled the refrigeration unit and freezed；Preferably, the multichannel
Digital analog converter is 24 multichannel AD7793 devices using sigma-delta modulation technique, which is integrated with high-precision
Constant-current source, filter etc. have the function of self calibration, system calibration, can eliminate zero point, full scale error and the shadow of temperature drift
It rings；Three-wire system PT100 platinum resistance due to spontaneous heating influences measurement accuracy in order to prevent simultaneously, and the AD7793 device is integrated
High precise current source is usually chosen to hundreds of microamperes, is set as 210 microamperes herein, accuracy of temperature control is not more than ± 0.1 DEG C.
The heating unit includes resistive heater, bidirectional triode thyristor type optocoupler and bidirectional triode thyristor, and the zero passage is two-way
The positive input pin of thyrister form optocoupler connects power supply VCC, the negative input of the Over zero bidirectional SCR type optocoupler by resistance
Pin connects I/O interface, and two output pins of the Over zero bidirectional SCR type optocoupler are separately connected AC power source, and institute
An output pin for stating Over zero bidirectional SCR type optocoupler connects the control terminal of the bidirectional triode thyristor, the bidirectional triode thyristor
Two fixing ends be separately connected AC power source；Preferably, the bidirectional triode thyristor type optocoupler is the mistake that trigger current is only 5mA
Zero bidirectional triode thyristor type optocoupler MOC3063, the optocoupler integrate the functions such as Phototube Coupling, zero passage detection, zero cross fired, avoid
I/O channel controls the defect of bidirectional triode thyristor triggering simultaneously, simplifies the design of output channel isolated drive circuit.
The bidirectional triode thyristor type optocoupler is controlled the resistive heater by the way of zero-crossing power adjustment and is heated to default height
Temperature value；Zero-crossing power adjustment mode is exactly to be adjusted by changing the AC sine wave number being added in load within the given time
A kind of control method of power；Due to it is silicon-controlled be the triggering and conducting in voltage (electric current) zero passage, waveform when conducting has been
Whole sine wave or half-wave, does not thus generate higher hamonic wave not only, loads surge current and current changing rate also all very little,
And network voltage is not influenced, not interference communications equipment.
The temperature control module judges that the step of whether resistive heater is heated to default high temperature value includes: to pass through institute
The temperature value that temperature detecting unit acquires resistive heater in real time is stated, judges that the temperature value variation is heating trend or cooling
Trend then further judges whether the temperature of current resistive heater is positive and negative the 0.1 of default high temperature value if heating trend
In range, if so, judging that the resistive heater is heated to default high temperature value.
The refrigeration unit is pump suction type refrigeration unit, and pump suction type refrigeration unit is provided with outside the thermal desorption tube,
By being pumped into cold air into the pump suction type refrigeration unit, the heat in the thermal desorption tube is taken away by the flowing of cold air
Amount, to achieve the effect that cooling.
The operation principle of the present invention is that:
The MCU main control module is disconnected according to the solenoid operated four-way valve 4 is controlled, to execute the wide range monitoring:
The MCU main control module controls the sampling pump 3 and the optic ionized sensor 6 powers on；
Environmental gas is pumped into from the air inlet 1, through the sampling pump 3, the first interface of the solenoid operated four-way valve 4, the electricity
4th interface of magnetic four-way valve 4 is sent into the optic ionized sensor 6, detects environment gas through the optic ionized sensor 6
Body TVOC value；
The MCU main control module judges that the environment TVOC value of the wide range monitoring gas circuit monitoring is wide range (1ppm-
40ppm) or small-range (0-1ppm), if wide range, then the MCU main control module is failure to actuate, and continues to execute wide range
Monitor process；If small-range, then the MCU main control module controls the connection of solenoid operated four-way valve 4 and wide range is monitored gas circuit
It is switched to small-range monitoring gas circuit, to execute small-range monitoring process:
The Concentration Sampling stage
The MCU main control module controls the sampling pump 3 and the optic ionized sensor 6 powers on；
Environmental gas is pumped into from the air inlet 1, through the sampling pump 3, the first interface of the solenoid operated four-way valve 4, the electricity
The second interface of magnetic four-way valve 4, the thermal desorption tube 5, the third interface of the solenoid operated four-way valve 4, the solenoid operated four-way valve 4
4th interface, the optic ionized sensor 6 are emptied from the exhaust outlet 8, and the TVOC in environmental gas is adsorbed on institute by enrichment
It states in thermal desorption tube 5；
Heating period
The MCU main control module controls the solenoid operated four-way valve 4 and disconnects, and the heating unit for controlling the thermal desorption tube 5 is opened,
So that the thermal desorption tube 5 is rapidly heated and be stabilized to default high temperature value, the TVOC being enriched in the thermal desorption tube 5 at this time is fast
Speed desorbs；
Parse the sample introduction stage
The MCU main control module controls the connection of solenoid operated four-way valve 4 and controls the optic ionized sensor 6 and powers on, at this time
Environmental gas is by the air inlet 1, the sampling pump 3, the first interface of the solenoid operated four-way valve 4, the solenoid operated four-way valve 4
Second interface, the thermal desorption tube 5, the third interface of the solenoid operated four-way valve 4, the solenoid operated four-way valve 4 the 4th interface into
Enter the optic ionized sensor 6, the TVOC for being desorbed out in the thermal desorption tube 5 also enters with environmental gas described
Optic ionized sensor 6 carries out content detection；
Cooling stages
The MCU main control module controls the solenoid operated four-way valve 4 and disconnects, and controls the sampling pump 3 and photoionization biography
Sensor 6 powers off, and the refrigeration unit for controlling the thermal desorption tube 5 is opened, and is made 5 fast cooling of thermal desorption tube and is stabilized to pre-
If low temperature value.
Embodiment 3
Be in place of the difference of the present embodiment and embodiment 2: as shown in figure 5, surrounding air TVOC monitoring gas circuit include into
Port 1, sampling pump 3, thermal desorption tube 5, optic ionized sensor 6 and exhaust outlet 8, the gas path switching device include the first electromagnetism
Triple valve 9 and the second three-way solenoid valve 10, first three-way solenoid valve 9 and second three-way solenoid valve 10 are identical electricity
Magnetic triple valve；When the three-way solenoid valve powers off, the first interface of the three-way solenoid valve is connected to the of the three-way solenoid valve
Three interfaces；When the three-way solenoid valve is connected, the first interface of the three-way solenoid valve is connected to the second of the three-way solenoid valve
Interface.
As shown in fig. 6, the first interface of the air inlet 1, the sampling pump 3, first three-way solenoid valve 9, described
The third interface of first three-way solenoid valve 9, the third interface of second three-way solenoid valve 10, second three-way solenoid valve 10
First interface, the optic ionized sensor 6 and the exhaust outlet 8 be sequentially communicated composition wide range monitoring gas circuit.
As shown in fig. 7, the first interface of the air inlet 1, the sampling pump 3, first three-way solenoid valve 9, described
The second interface of three-way solenoid valve 9, the thermal desorption tube 5, the second interface of second three-way solenoid valve 10, second electricity
The first interface of magnetic triple valve 10, the optic ionized sensor 6 and the exhaust outlet 8 are sequentially communicated the composition small-range prison
Survey gas circuit；
The control device control connects first three-way solenoid valve 9 and second three-way solenoid valve 10, by controlling institute
The on-off for stating the first three-way solenoid valve 9 and second three-way solenoid valve 10 realizes the wide range monitoring gas circuit and described a small amount of
The switching of journey monitoring gas circuit.
Embodiment 4
Be in place of the present embodiment and the difference of embodiment 2 and embodiment 3: the wide range monitoring and small-range monitoring are equal
With periodicity, and analytical cycle can be preset, and default setting is one monitoring process of half an hour at present.
Embodiment 5
It is in place of the difference of the present embodiment and embodiment 2 and embodiment 3: as shown in Figure 8 and Figure 9, the exhaust outlet 8 and described
Flow sensor 7 is additionally provided between optic ionized sensor 6, the MCU main control module is connect with the flow sensor 7,
The flow velocity of the sampling pump 3 is controlled according to the gas flow that the flow sensor 7 acquires and opens the shut-in time to realize precisely
Air inlet.
Embodiment 6
It is in place of the present embodiment and the difference of embodiment 5: as shown in Figure 10 and Figure 11, the air inlet 1 and the sampling pump 3
Between be additionally provided with filter 2, it is preferred that the filter 2 uses accurate filter 2, by the filter 2 to flowing through gas
Body is pre-processed, to filter the particle dust and steam in surrounding air and under test gas, prevent small particle or steam into
Entering into gas circuit influences 5 performance of thermal desorption tube, to improve the service life of associated components.
Embodiment 7
Be in place of the present embodiment and the difference of embodiment 2 and embodiment 3: as shown in Figure 12 and Figure 13, the sampling pump 3 may be used also
To be arranged before the exhaust outlet 8.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof；To the greatest extent
The present invention is described in detail with reference to preferred embodiments for pipe, it should be understood by those ordinary skilled in the art that: still
It can modify to a specific embodiment of the invention or some technical features can be equivalently replaced；Without departing from this hair
The spirit of bright technical solution should all cover in the claimed technical proposal scope of the present invention.
Claims (10)
1. a kind of novel environmental air TVOC on-line monitoring system, it is characterised in that: including human-computer interaction module, control device and
Surrounding air TVOC monitors gas circuit, and the surrounding air TVOC monitoring gas circuit includes being respectively used to detection surrounding air TVOC value
Wide range monitors gas circuit and small-range monitors gas circuit, and for monitoring gas circuit and small-range monitoring gas in the wide range
The gas path switching device mutually switched between road；The human-computer interaction module is connect with the control device, is used for the control
Device input function instruction processed and functional parameter；The control device is described big according to the function command and functional parameter control
Range monitors gas circuit work, and controls the gas path switching device according to the environment TVOC value that the wide range monitors gas circuit monitoring
Wide range monitoring gas circuit is switched into the small-range monitoring gas circuit；The human-computer interaction module also respectively with it is described a large amount of
Journey monitors gas circuit and the small-range monitors air circuit connection, for showing wide range monitoring gas circuit or small-range monitoring gas circuit
The environment TVOC value of monitoring.
2. novel environmental air TVOC on-line monitoring system according to claim 1, it is characterised in that: the gas circuit switching
Device is solenoid operated four-way valve, when the solenoid operated four-way valve powers off, the first interface of the solenoid operated four-way valve and the electromagnetism four-way
The third orifice of 4th orifice of valve, the second interface of the solenoid operated four-way valve and the solenoid operated four-way valve；It is described
When solenoid operated four-way valve is powered, the third orifice of the first interface of the solenoid operated four-way valve and the solenoid operated four-way valve is described
4th orifice of the second interface of solenoid operated four-way valve and the solenoid operated four-way valve；
The surrounding air TVOC monitoring gas circuit includes air inlet, sampling pump, thermal desorption tube, optic ionized sensor and exhaust
Mouthful, the air inlet, the sampling pump, the first interface of the solenoid operated four-way valve, the 4th interface of the solenoid operated four-way valve, institute
It states optic ionized sensor and the exhaust outlet is sequentially communicated the composition wide range monitoring gas circuit；The air inlet described is adopted
Sample pump, the first interface of the solenoid operated four-way valve, the second interface of the solenoid operated four-way valve, the thermal desorption tube, the electromagnetism
The third interface of four-way valve, the solenoid operated four-way valve the 4th interface, the optic ionized sensor and the exhaust outlet successively
Connection forms the small-range and monitors gas circuit；
The control device control connects the solenoid operated four-way valve, and the on-off by controlling the solenoid operated four-way valve is realized described big
Range monitors the switching of gas circuit and small-range monitoring gas circuit.
3. novel environmental air TVOC on-line monitoring system according to claim 1, it is characterised in that: the gas circuit switching
Device includes the first three-way solenoid valve and the second three-way solenoid valve, first three-way solenoid valve and second three-way solenoid valve
For identical three-way solenoid valve；When the three-way solenoid valve powers off, the first interface of the three-way solenoid valve is connected to the electromagnetism
The third interface of triple valve；When the three-way solenoid valve is connected, the first interface of second three-way solenoid valve is connected to the electricity
The second interface of magnetic triple valve；
The surrounding air TVOC monitoring gas circuit includes air inlet, sampling pump, thermal desorption tube, optic ionized sensor and exhaust
Mouthful, the air inlet, the sampling pump, the first interface of first three-way solenoid valve, first three-way solenoid valve the
Three interfaces, the third interface of second three-way solenoid valve, the first interface of second three-way solenoid valve, the photoionization
Sensor and the exhaust outlet are sequentially communicated the composition wide range monitoring gas circuit；
The air inlet, the sampling pump, the first interface of first three-way solenoid valve, the three-way solenoid valve second connect
Mouth, the thermal desorption tube, the second interface of second three-way solenoid valve, the first interface of the three-way solenoid valve, the light
Ionization sensor and the exhaust outlet are sequentially communicated the composition small-range monitoring gas circuit；
Control device control connects first three-way solenoid valve and second three-way solenoid valve, by controlling described the
The on-off of one three-way solenoid valve and second three-way solenoid valve realizes the wide range monitoring gas circuit and small-range monitoring
The switching of gas circuit.
4. novel environmental air TVOC on-line monitoring system according to claim 2 or 3, it is characterised in that: the control
Device includes MCU main control module, temperature control module, data transmission module and power module, and the temperature control module is described for adjusting
The temperature of gas path switching device, the thermal desorption tube and gas circuit pipeline；The data transmission module is for realizing data transmission；Institute
State MCU main control module respectively with the temperature control module, the data transmission module, the sampling pump and the gas path switching device
Connection, the power module respectively with the MCU main control module, the temperature control module, the data transmission module, the gas circuit
Switching device is connected with the sampling pump, for providing working power.
5. novel environmental air TVOC on-line monitoring system according to claim 4, it is characterised in that: the temperature control module
Including temperature detecting unit, processor unit, heating unit and refrigeration unit, the temperature detecting unit includes three-wire system
PT100 platinum resistance, amplifier AD620 and multichannel digital analog converter, the three-wire system PT100 platinum resistance are used for temperature signal
Analog voltage signal is converted to, the amplifier AD620 is for amplifying the analog voltage signal, the multichannel digital-to-analogue conversion
Device is used to convert digital voltage signal for the analog voltage signal；The processor unit respectively with the multichannel digital-to-analogue
Converter, the heating unit are connected with the refrigeration unit, according to the digital voltage signal control the heating unit into
Row, which heats or controls the refrigeration unit, to freeze.
6. novel environmental air TVOC on-line monitoring system according to claim 5, which is characterized in that the wide range prison
The monitoring step for surveying gas circuit is as follows:
The MCU main control module controls the gas path switching device and disconnects, and controls the sampling pump and photoionization biography
Sensor powers on；
Environmental gas is pumped into from the air inlet, is sent into the photoionization through the sampling pump, the gas path switching device and is passed
Sensor detects environmental gas TVOC value through the optic ionized sensor.
7. novel environmental air TVOC on-line monitoring system according to claim 5, which is characterized in that the small-range prison
The monitoring step for surveying gas circuit is as follows:
The Concentration Sampling stage
The MCU main control module controls the gas path switching device and connects, and controls the sampling pump and photoionization biography
Sensor powers on；
Environmental gas is pumped into from the air inlet, through the sampling pump, gas path switching device, the thermal desorption tube, described
Optic ionized sensor is emptied from the exhaust outlet, and the TVOC in environmental gas, which is enriched with, to be adsorbed in the thermal desorption tube；
Heating period
The MCU main control module controls the gas path switching device and disconnects, and the heating unit controlled in the thermal desorption tube is opened
It opens, the thermal desorption tube is made to be rapidly heated and is stabilized to default high temperature value, the TVOC quilt being enriched in the thermal desorption tube at this time
Fast desorption comes out；
Parse the sample introduction stage
The MCU main control module controls the gas path switching device connection and controls the optic ionized sensor and powers on, at this time
Environmental gas enters the photoionization by the air inlet, the sampling pump, the gas path switching device, the thermal desorption tube
Sensor, the TVOC for being desorbed out in the thermal desorption tube also with environmental gas enter the optic ionized sensor into
Row content detection；
Cooling stages
The MCU main control module controls the gas path switching device and disconnects, and controls the sampling pump and photoionization biography
Sensor power-off, and the refrigeration unit for controlling the thermal desorption tube is opened, and is made the thermal desorption tube fast cooling and is stabilized to default
Low temperature value.
8. novel environmental air TVOC on-line monitoring system according to claim 4, it is characterised in that: the exhaust outlet and
Flow sensor is additionally provided between the optic ionized sensor, the MCU main control module is connect with the flow sensor,
The flow velocity of the sampling pump is controlled according to the gas flow that the flow sensor acquires to realize accurate air inlet.
9. novel environmental air TVOC on-line monitoring system according to claim 2 or 3, it is characterised in that: the air inlet
Filter is additionally provided with after mouthful, the filter is used to filter the particle in surrounding air.
10. novel environmental air TVOC on-line monitoring system according to claim 2 or 3, it is characterised in that: the sampling
Pump can also be arranged in front of the exhaust outlet.
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