CN209416973U - 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 PDF

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Publication number
CN209416973U
CN209416973U CN201822144475.4U CN201822144475U CN209416973U CN 209416973 U CN209416973 U CN 209416973U CN 201822144475 U CN201822144475 U CN 201822144475U CN 209416973 U CN209416973 U CN 209416973U
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gas circuit
way
interface
valve
monitoring
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CN201822144475.4U
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陈海永
张华杰
王栋
侯贤祥
慎金鸽
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Hanwei Technology Group Ltd By Share Ltd
Hanwei Electronics Group Corp
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Hanwei Technology Group Ltd By Share Ltd
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Abstract

The utility model 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

A kind of novel environmental air TVOC on-line monitoring system
Technical field
The utility model relates to a kind of surrounding air TVOC to monitor system, specifically, it is empty relate to a kind of novel environmental Gas 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 this utility model is in view of the deficiencies of the prior art, to provide one kind and have a wide range of application, measurement accuracy High novel environmental air TVOC on-line monitoring system.
To achieve the goals above, the technical scheme adopted by the utility model is a kind of novel environmental air TVOC exists Line monitoring system, including human-computer interaction module, control device and surrounding air TVOC monitor gas circuit, the surrounding air TVOC prison Surveying gas circuit includes being respectively used to the wide range monitoring gas circuit and small-range monitoring gas circuit of detection surrounding air TVOC value, and be used for The gas path switching device mutually switched between gas circuit and small-range monitoring gas circuit is monitored in the wide range;The man-machine friendship Mutual module is connect with the control device, is used for control device input function instruction and functional parameter;The control dress It sets and the wide range monitoring gas circuit work is controlled according to the function command and functional parameter, and gas is monitored according to the wide range The environment TVOC value of road monitoring controls the gas path switching device and wide range monitoring gas circuit is switched to the small-range prison Survey gas circuit;The human-computer interaction module also monitors gas circuit with the wide range respectively and the small-range monitors air circuit connection, uses In display wide range monitoring gas circuit or the environment TVOC value of 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 row Port, the air inlet, the sampling pump, the first interface of the solenoid operated four-way valve, the solenoid operated four-way valve the 4th interface, The optic ionized sensor and the exhaust outlet are sequentially communicated the composition wide range monitoring gas circuit;It is the air inlet, described Sampling 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 electricity The third interface of magnetic four-way valve, the solenoid operated four-way valve the 4th interface, the optic ionized sensor and the exhaust outlet according to Secondary 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 realizes institute State the switching of wide range monitoring 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, the electromagnetism The first interface of triple 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 row Port, the air inlet, the sampling pump, the first interface of first three-way solenoid valve, first three-way solenoid valve Third interface, the third interface of second three-way solenoid valve, the first interface of second three-way solenoid valve, the photoion Change sensor and the exhaust outlet is sequentially communicated the composition wide range monitoring gas circuit;
The air inlet, the sampling pump, the first interface of first three-way solenoid valve, first three-way solenoid valve Second interface, the thermal desorption tube, the second interface of second three-way solenoid valve, second three-way solenoid valve first Interface, the optic ionized sensor and the exhaust outlet are sequentially communicated the composition small-range monitoring gas circuit;
The control device control connects first three-way solenoid valve and second three-way solenoid valve, by controlling institute The on-off for stating the first three-way solenoid valve and second three-way solenoid valve realizes the wide range monitoring gas circuit and the small-range Monitor 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, 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 utility model has substantive features and progress compared with the prior art, and specifically, the utility model utilizes richness The detection technique building small-range monitoring that collection thermal desorption and optic ionized sensor combine, by the inspection of traditional TVOC detecting instrument It surveys range and extends to trace level, the problem of the lowest detection line of the traditional TVOC detecting instrument of very good solution and sensitivity;And And by according in environmental gas TVOC containing amount control device control gas path switching device realize wide range monitor gas circuit and Small-range monitors the switching of gas circuit, so that the application range of surrounding air TVOC on-line monitoring system is wider;It is filled by control Setting control sampling pump, flow sensor realizes the accurate and flexible acquisition of sample gas;The utility model 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 utility model embodiment 2.
Fig. 2 is the wide range monitoring gas circuit of the utility model embodiment 2.
Fig. 3 is the small-range monitoring gas circuit of the utility model embodiment 2.
Fig. 4 is the control device schematic diagram of the utility model.
Fig. 5 is the structural schematic diagram of the utility model embodiment 3.
Fig. 6 is the wide range monitoring gas circuit of the utility model embodiment 3.
Fig. 7 is the small-range monitoring gas circuit of the utility model embodiment 3.
Fig. 8 is a kind of structural schematic diagram of the utility model embodiment 5.
Fig. 9 is another structural schematic diagram of the utility model embodiment 5.
Figure 10 is a kind of structural schematic diagram of the utility model embodiment 6.
Figure 11 is another structural schematic diagram of the utility model embodiment 6.
Figure 12 is a kind of structural schematic diagram of the utility model embodiment 7.
Figure 13 is another structural schematic diagram of the utility model embodiment 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, the technical solution of the utility model is described in further detail.
Embodiment 1
The utility model provides a kind of novel environmental air TVOC on-line monitoring system, including human-computer interaction module, control Device and surrounding air TVOC monitor gas circuit, it is preferred that the human-computer interaction module includes the units such as bar magnet and display screen, described Bar magnet is used to carry out the selection of function command and the setting of functional parameter in start-up phase.The display screen is primarily used to show The information such as current time, current state information, the progress of current process and the TVOC content value of 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, and root according to the function command and functional parameter The gas path switching device is controlled according to the environment TVOC value of wide range monitoring gas circuit monitoring, and the wide range is monitored into gas circuit Switch to the small-range monitoring gas circuit;Specifically, when the environment TVOC value of wide range monitoring gas circuit monitoring is small-range (0-1ppm), it is described to switch to wide range monitoring gas circuit that the control device controls the gas path switching device movement Small-range monitors gas circuit;When the environment TVOC value of wide range monitoring gas circuit monitoring is wide range (1ppm -40ppm), The control device controls the gas path switching device and is failure to actuate, and continues to execute the wide range monitoring gas circuit;The wide range Monitoring gas circuit or the environment TVOC value of small-range monitoring gas circuit monitoring are shown by the human-computer interaction module.
The utility model according to the control gas path switching device containing amount control device of TVOC in environmental gas by realizing Wide range 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 It is wider.
Embodiment 2
It is in place of the present embodiment and the difference of embodiment 1: as shown in Figure 1, the surrounding air TVOC monitors gas circuit packet Air inlet 1, sampling pump 3, thermal desorption tube 5, optic ionized sensor 6 and exhaust outlet 8 are included, the gas path switching device is 4 electromagnetism Four-way valve, when the solenoid operated four-way valve 4 powers off, the 4th of the first interface of the solenoid operated four-way valve 4 and the solenoid operated four-way valve 4 the Orifice, the second interface of the solenoid operated four-way valve 4 and the third orifice of the solenoid operated four-way valve 4;The electromagnetism four When port valve 4 is powered, 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 4th orifice of the second interface of four-way 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 The 4th interface, the optic ionized sensor 6 and the exhaust outlet 8 of four-way 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 include MCU main control module, temperature control module, data transmission module and Power 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 respectively with the temperature control module, the data transmission module, the sampling pump 3 and the gas circuit Switching device connection, the power module respectively with the MCU main control module, the temperature control module, the data transmission module, The 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 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 working principle of the utility model are as follows:
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, institute The 4th interface for stating solenoid operated four-way valve 4 is sent into the optic ionized sensor 6, detects ring through the optic ionized sensor 6 Border gas 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, institute State the second interface, the thermal desorption tube 5, the third interface of the solenoid operated four-way valve 4, the electromagnetism four-way of solenoid operated four-way valve 4 The 4th interface, the optic ionized sensor 6 of valve 4 are emptied from the exhaust outlet 8, and the TVOC in environmental gas is adsorbed by enrichment In the thermal desorption tube 5;
Heating period
The MCU main control module controls the solenoid operated four-way valve 4 and disconnects, and controls the heating unit of the thermal desorption tube 5 It opens, so that the thermal desorption tube 5 is rapidly heated and be stabilized to default high temperature value, be enriched in the thermal desorption tube 5 at this time TVOC is come out by fast desorption;
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, Environmental gas is by the air inlet 1, the sampling pump 3, the first interface of the solenoid operated four-way valve 4, the electromagnetism four-way at this time The second interface of 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 the 4th connect Mouth enters the optic ionized sensor 6, and the TVOC for being desorbed out in the thermal desorption tube 5 also enters with environmental gas The 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 the photoion Change sensor 6 to power off, and the refrigeration unit for controlling the thermal desorption tube 5 is opened, and 5 fast cooling of thermal desorption tube and stabilization are made To default low temperature value.
Embodiment 3
It is in place of the present embodiment and the difference of embodiment 2: as shown in figure 5, the surrounding air TVOC monitors gas circuit packet Air inlet 1, sampling pump 3, thermal desorption tube 5, optic ionized sensor 6 and exhaust outlet 8 are included, the gas path switching device includes first Three-way solenoid 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 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 three-way solenoid valve Third interface;When the three-way solenoid valve is connected, the first interface of the three-way solenoid valve is connected to the three-way solenoid valve Second 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 Second interface, the thermal desorption tube 5, the second interface of second three-way solenoid valve 10, described of first three-way solenoid valve 9 It is described a small amount of that first interface, the optic ionized sensor 6 and the exhaust outlet 8 of two three-way solenoid valves 10 are sequentially communicated composition Journey monitors gas circuit;
The control device control connects first three-way solenoid valve 9 and second three-way solenoid valve 10, passes through control The on-off for making first three-way solenoid valve 9 and second three-way solenoid valve 10 realizes the wide range monitoring gas circuit and described The switching of small-range 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 the small-range are supervised Survey all has 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 present embodiment and the difference of embodiment 2 and embodiment 3: as shown in Figure 8 and Figure 9,8 He of exhaust outlet Flow sensor 7 is additionally provided between the optic ionized sensor 6, the MCU main control module and the flow sensor 7 connect It connects, 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 essence Quasi- air inlet.
Embodiment 6
It is in place of the difference of the present embodiment and embodiment 5: as shown in Figure 10 and Figure 11, the air inlet 1 and described adopts Filter 2 is additionally provided between sample pump 3, it is preferred that the filter 2 uses accurate filter 2, right by the filter 2 Gas coming through is pre-processed, to filter the particle dust and steam in surrounding air and under test gas, prevent small particle or Steam enters influence 5 performance of thermal desorption tube in gas circuit, to improve the service life of associated components.
Embodiment 7
It is 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 It can also be arranged in front of the exhaust outlet 8.
Finally it should be noted that: above embodiments are only to illustrate the technical solution of the utility model rather than limit it System;Although the utility model has been described in detail with reference to the preferred embodiment, those of ordinary skill in the art should Understand: specific implementation of the utility model can still be modified or is equally replaced to some technical characteristics It changes;Without departing from the spirit of technical solutions of the utility model, should all cover in the claimed technical solution of the utility model In range.

Claims (8)

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 the three-way solenoid valve is connected to the electromagnetism three The second interface of port 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, first three-way solenoid valve Two interfaces, the thermal desorption tube, the second interface of second three-way solenoid valve, second three-way solenoid valve first connect Mouth, the optic ionized 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. according to novel environmental air TVOC on-line monitoring system as claimed in claim 4, it is characterised in that: the temperature control module packet Temperature detecting unit, processor unit, heating unit and refrigeration unit are included, 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 is for converting temperature signal For analog voltage signal, the amplifier AD620 is used for amplifying the analog voltage signal, the multichannel digital analog converter In converting digital voltage signal for the analog voltage signal;The processor unit respectively with the multichannel digital-to-analogue conversion Device, the heating unit are connected with the refrigeration unit, are controlled the heating unit according to the digital voltage signal and are added Heat or the control refrigeration unit freeze.
6. 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.
7. 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.
8. 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.
CN201822144475.4U 2018-12-20 2018-12-20 A kind of novel environmental air TVOC on-line monitoring system Active CN209416973U (en)

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