CN101201604A - Automatic monitoring device for open-top artificial fuming test - Google Patents
Automatic monitoring device for open-top artificial fuming test Download PDFInfo
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- CN101201604A CN101201604A CNA2007101564961A CN200710156496A CN101201604A CN 101201604 A CN101201604 A CN 101201604A CN A2007101564961 A CNA2007101564961 A CN A2007101564961A CN 200710156496 A CN200710156496 A CN 200710156496A CN 101201604 A CN101201604 A CN 101201604A
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- solenoid valve
- electromagnetic valve
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Abstract
The invention provides an automatic monitoring device for a top open artificial fume experiment. The invention comprises an online gas sensor which is used for detecting the gas concentration of a fume room, an electromagnetic valve which is used for controlling the gas inlet flow of a gas source, an electromagnetic valve controller which is used for controlling the valve action of the electromagnetic valve and a computer. The online gas sensor is connected with the computer. The computer comprises a gas monitoring module which is used for comparing the measured value of the gas sensor and a default gas concentration value and selectively sending instruction to the electromagnetic valve controller to turn on or turn off the electromagnetic valve. The output of the gas monitoring module is connected with the electromagnetic valve controller which is connected with the electromagnetic valve. The invention provides the automatic monitoring device for the top open artificial fume experiment which automatically monitors the concentration value of the fume and is of high control precision.
Description
(1) technical field
The present invention relates to open-top artificial fuming test equipment, especially a kind of automatic monitoring device of smoked gas concentration.
(2) background technology
The open-top artificial fuming device is at first to be set up by the U.S. beginning of the seventies.This device top is unlimited fully, and controlled gaseous contaminant constantly enters in the cover with airflow, behind the contact test plant, is diffused in the atmosphere by the top of opening wide.Yet, carry out test in the past and often enter in the smoked air chamber what by manual adjustments cylinder valve pilot-gas, there is bigger personal error.Even if adopt monitoring automatically, its accuracy of instrument and automaticity are not high yet.
(3) summary of the invention
For the employing manual adjustments cylinder valve that overcomes existing open-top artificial fuming test equipment, the deficiency that precision is low, the invention provides the automatic monitoring device of the high open-top artificial fuming test of concentration value, the control accuracy of the smoked gas of a kind of automatic monitoring.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of automatic monitoring device of open-top artificial fuming test, comprise the online gas sensor that is used to detect the gas concentration of smoking air chamber, be used to control the solenoid valve of the charge flow rate of source of the gas, the solenoid valve controller of the valve event of control electromagnetic valve and computing machine, described online gas sensor connects computing machine, described computing machine comprises the measured value and default gas concentration value that is used for the comparison gas sensor, and optionally send the gas monitor module of opening or turn-offing the solenoid valve instruction to solenoid valve controller, the output of described gas monitor module connects the described solenoid valve controller of solenoid valve controller and connects solenoid valve.
Further, described solenoid valve is little flux switch valve.
Technical conceive of the present invention is: provide source of the gas by bottled gas, test gas is sent in the smoked air chamber from smoked air chamber bottom by blower fan.Blower fan adopts the constant method of operation in the whole service process, it is not carried out flow control.
Regularly send data acquisition signal to the current acquisition module by single-chip microcomputer by the RS232 change-over circuit.Obtain test gas concentration value in the current smoked air chamber by online gas sensor, and transfer to the current acquisition module with current signal.The current acquisition module is sent to single-chip microcomputer according to acquisition with collection result.Single-chip microcomputer carries out being sent to computing machine through another road RS232 change-over circuit after the simple process.Computing machine is judged the action that solenoid valve should be taked according to information such as concentration settings, and is sent to single-chip microcomputer by the RS232 change-over circuit.Carry out corresponding actions by single-chip microcomputer by the solenoid valve controller control electromagnetic valve, thereby reach the purpose of concentration of toxic gases in the smoked air chamber of control.
During program run, at first at PC Control Software window parameter is set, i.e. the desired value of gas concentration control, the actual concentrations of gas sensor are measured the frequency of range and image data.PC shows the data that collect, the line item of going forward side by side.Owing to require the toxic gas flow very little, solenoid valve adopts little flux switch valve, controls average discharge in low frequency PWM mode.
Beneficial effect of the present invention mainly shows: concentration value, the control accuracy height of gas smoked in monitoring automatically.
(4) description of drawings
Fig. 1 is the system diagram of smoked air chamber experiment.
Fig. 2 is that control system is always schemed.
Fig. 3 is the computer controlled process synoptic diagram.
(5) embodiment
Below in conjunction with accompanying drawing the present invention is further described.
With reference to Fig. 1～Fig. 3, a kind of automatic monitoring device of open-top artificial fuming test, comprise the online gas sensor 1 that is used to detect the gas concentration of smoking air chamber, be used to control the solenoid valve 2 of the charge flow rate of source of the gas, the solenoid valve controller 3 of the valve event of control electromagnetic valve 2 and computing machine 4, described online gas sensor 1 connects computing machine 4, described computing machine 4 comprises the measured value and default gas concentration value that is used for the comparison gas sensor, and optionally send the gas monitor module of opening or turn-offing the solenoid valve instruction to solenoid valve controller, the output of described gas monitor module connects solenoid valve controller 3, and described solenoid valve controller 3 connects solenoid valve 2.
Described solenoid valve 2 is little flux switch valve.
Present embodiment provides source of the gas by bottled gas, and source of the gas connects solenoid valve 2 by reduction valve.Test gas is sent in the smoked air chamber from smoked air chamber bottom by blower fan 5.Blower fan 5 adopts the constant method of operation in the whole service process, it is not carried out flow control.
Regularly send data acquisition signal to the current acquisition module by single-chip microcomputer by the RS232 change-over circuit.Obtain test gas concentration value in the current smoked air chamber by online gas sensor 1, and transfer to the current acquisition module with current signal.The current acquisition module is sent to single-chip microcomputer according to acquisition with collection result.Single-chip microcomputer carries out being sent to computing machine through another road RS232 change-over circuit after the simple process.Computing machine 4 is judged the action that solenoid valve 2 should be taked according to information such as concentration settings, and is sent to single-chip microcomputer by the RS232 change-over circuit.Carry out corresponding actions by single-chip microcomputer by solenoid valve controller 3 control electromagnetic valve 2, thereby reach the purpose of concentration of toxic gases in the smoked air chamber of control.
During program run, at first at the computer control software window parameter is set, i.e. the desired value of gas concentration control, the actual concentrations of gas sensor are measured the frequency of range and image data.Computing machine shows the data that collect, the line item of going forward side by side.Owing to require the toxic gas flow very little, solenoid valve adopts little flux switch valve, controls average discharge in low frequency PWM mode.
Example: the SO2 gas concentration is in 3ppm in the smoked air chamber of control.
Monitoring software in the operation computing machine is set SO
2The concentration sensor range ability is 0-20ppm, and target setting concentration is 3ppm, and the setting data acquisition interval is 5 seconds.Open bottled source of the gas and blower fan.Single-chip microcomputer passed through the RS232 change-over circuit in per 5 seconds and sends data acquisition signal to the current acquisition module.The current acquisition module is gathered test gas concentration value in the current smoked air chamber that is obtained by online gas sensor 1 after receiving signal, and collection result is sent to single-chip microcomputer.Single-chip microcomputer carries out being sent to computing machine 4 through another road RS232 change-over circuit after the simple process.Computing machine 4 judges that current concentration is to be below or above 3ppm, when being lower than 3ppm, judging that then solenoid valve should open, and is sent to single-chip microcomputer by the RS232 change-over circuit, is opened by the solenoid valve control circuit control electromagnetic valve by single-chip microcomputer; When being higher than 3ppm, then do not open.Simultaneously, calculating meter is recorded in all processes in the database.So circulation, thus reach the purpose that concentration of toxic gases in the air chamber is smoked in control.
Claims (2)
1. the automatic monitoring device of an open-top artificial fuming test, it is characterized in that: described automatic monitoring device comprises the online gas sensor that is used to detect the gas concentration of smoking air chamber, be used to control the solenoid valve of the charge flow rate of source of the gas, the solenoid valve controller of the valve event of control electromagnetic valve and computing machine, described online gas sensor connects computing machine, described computing machine comprises the measured value and default gas concentration value that is used for the comparison gas sensor, and optionally send the gas monitor module of opening or turn-offing the solenoid valve instruction to solenoid valve controller, the output of described gas monitor module connects solenoid valve controller, and described solenoid valve controller connects solenoid valve.
2. the automatic monitoring device of open-top artificial fuming test as claimed in claim 1, it is characterized in that: described solenoid valve is little flux switch valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101564961A CN101201604A (en) | 2007-11-09 | 2007-11-09 | Automatic monitoring device for open-top artificial fuming test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101564961A CN101201604A (en) | 2007-11-09 | 2007-11-09 | Automatic monitoring device for open-top artificial fuming test |
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| Publication Number | Publication Date |
|---|---|
| CN101201604A true CN101201604A (en) | 2008-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101564961A Pending CN101201604A (en) | 2007-11-09 | 2007-11-09 | Automatic monitoring device for open-top artificial fuming test |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102415299A (en) * | 2011-08-23 | 2012-04-18 | 中国科学院东北地理与农业生态研究所 | CO2Multiplication open top type air chamber |
| CN115228643A (en) * | 2022-09-03 | 2022-10-25 | 苏州微知电子科技有限公司 | Pneumatic atomization spraying method and system |
-
2007
- 2007-11-09 CN CNA2007101564961A patent/CN101201604A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102415299A (en) * | 2011-08-23 | 2012-04-18 | 中国科学院东北地理与农业生态研究所 | CO2Multiplication open top type air chamber |
| CN115228643A (en) * | 2022-09-03 | 2022-10-25 | 苏州微知电子科技有限公司 | Pneumatic atomization spraying method and system |
| CN115228643B (en) * | 2022-09-03 | 2024-03-29 | 苏州微知电子科技有限公司 | Pneumatic atomization spraying method and system |
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Open date: 20080618 |