CN109557009B - Wide-range particulate matter detection device - Google Patents
Wide-range particulate matter detection device Download PDFInfo
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- CN109557009B CN109557009B CN201910059811.1A CN201910059811A CN109557009B CN 109557009 B CN109557009 B CN 109557009B CN 201910059811 A CN201910059811 A CN 201910059811A CN 109557009 B CN109557009 B CN 109557009B
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- 238000001514 detection method Methods 0.000 title claims abstract description 56
- 239000013618 particulate matter Substances 0.000 title claims abstract description 53
- 239000003570 air Substances 0.000 claims abstract description 107
- 239000012080 ambient air Substances 0.000 claims abstract description 50
- 238000001914 filtration Methods 0.000 claims abstract description 46
- 238000012544 monitoring process Methods 0.000 claims abstract description 21
- 239000002245 particle Substances 0.000 claims abstract description 8
- 238000007791 dehumidification Methods 0.000 claims abstract description 6
- 238000005520 cutting process Methods 0.000 claims abstract description 4
- 229920001296 polysiloxane Polymers 0.000 claims description 18
- 238000007664 blowing Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 2
- 238000010790 dilution Methods 0.000 claims description 2
- 239000012895 dilution Substances 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 abstract description 8
- 238000007865 diluting Methods 0.000 abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 16
- 239000000741 silica gel Substances 0.000 description 16
- 229910002027 silica gel Inorganic materials 0.000 description 16
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 101000798769 Mus musculus Troponin C, skeletal muscle Proteins 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000000790 scattering method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
- B01D46/62—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in series
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/075—Investigating concentration of particle suspensions by optical means
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Abstract
The invention discloses a wide-range particulate matter detection device which comprises a particulate matter cutter, a dehumidifier, a sensor, a controller, an exhaust module, a gas circuit switching module and a filtering module, wherein the dehumidifier is arranged on the particulate matter cutter; after cutting the particles in the ambient air, the particle cutter outputs the ambient air to the dehumidifier for dehumidification; the sensor detects the concentration of particulate matters in dehumidified ambient air and feeds back a detection value to the controller; the air exhaust module carries out primary filtration on dehumidified ambient air and then discharges the dehumidified ambient air to the air channel switching module, the controller controls the air channel switching module to discharge the ambient air to the filtering module for filtering according to the detection value, the filtered ambient air is transmitted to the dehumidifier for diluting the concentration of particulate matters, and the ambient air flows through the sensor again for cleaning the sensor. The background value being larger than the preset value indicates that the sensor is polluted, clean air plays a role in cleaning the sensor, and the problem that an existing particulate matter online monitoring system cannot automatically clean the sensor can be solved.
Description
Technical Field
The invention relates to the technical field of environmental protection monitoring, in particular to a wide-range particulate matter detection device.
Background
The conventional particulate matter on-line monitoring system capable of performing large-range point distribution monitoring in the market at present has limited measuring range and precision, for example, the measuring range is usually within 10mg/m < 3 >. The small range can not meet the requirement of on-line monitoring in a severe high-concentration haze environment; in addition, under the influence of humidity, the concentration of the particulate matters is difficult to accurately monitor under the conditions of high concentration and high humidity. Particularly in some factories and mines with serious pollution, the on-line monitoring and the automatic cleaning of the inside of the sensor are more difficult to realize. Because many particulate matter on-line monitoring systems are all fixed range now, the gas circuit design is single, can't satisfy the demand of high concentration, wide range, and sensor itself also receives the pollution easily under high concentration environment, and the later maintenance is also very inconvenient.
There is thus a need for improvements and improvements in the art.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a wide-range particulate matter detection device, so as to solve the problem that the existing particulate matter online monitoring system cannot automatically clean the sensor.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the wide-range particulate matter detection device comprises a particulate matter cutter, a dehumidifier, a sensor, a controller, an exhaust module, a gas circuit switching module and a filtering module;
the output end of the particulate matter cutter is connected with the input end of the dehumidifier, the output end of the dehumidifier is connected with the input end of the sensor, the output end of the sensor is connected with the input end of the exhaust module, the output end of the exhaust module is connected with the input end of the gas circuit switching module, one output end of the gas circuit switching module is connected with the feedback gas end of the dehumidifier through the filtering module, and the other output end of the gas circuit switching module is the exhaust end of the whole gas circuit; the controller is electrically connected with the dehumidifier, the sensor, the exhaust module and the corresponding control port of the air path switching module;
the controller controls the working state of the dehumidifier according to the monitoring value of the temperature and the humidity detected by the temperature and humidity detection module, and the particulate matter cutter outputs the ambient air to the dehumidifier for dehumidification after cutting the particulate matters in the ambient air; the sensor detects the concentration of particulate matters in dehumidified ambient air and feeds back a detection value to the controller; the air exhaust module carries out primary filtration on dehumidified ambient air and then discharges the dehumidified ambient air to the air channel switching module, the controller controls the air channel switching module to discharge the ambient air to the filtering module for filtering according to the detection value, the filtered ambient air is transmitted to the dehumidifier for diluting the concentration of particulate matters, and the ambient air flows through the sensor again for cleaning the sensor.
In the wide-range particulate matter detection device, the output end of the particulate matter cutter is connected with the input end of the dehumidifier through a silica gel pipe with the specification of phi 6, the output end of the dehumidifier is connected with the input end of the sensor through a silica gel pipe with the specification of phi 4, the output end of the sensor is connected with the input end of the exhaust module through a silica gel pipe with the specification of phi 4, and the controller is connected with the sensor through a communication interface.
In the wide-range particulate matter detection device, the controller also controls the air passage switching module to discharge the ambient air into the air according to the detection value when judging that the background value is smaller than a preset value.
In the wide-range particulate matter detection device, the exhaust module comprises a first filter and a micro diaphragm pump; the input end of the first filter is connected with the output end of the dehumidifier, the output end of the first filter is connected with the air suction nozzle of the micro diaphragm pump, the air discharge nozzle of the micro diaphragm pump is connected with the input end of the air path switching module, and the power supply control end of the micro diaphragm pump is electrically connected with the controller;
the first filter is used for carrying out primary filtration on dehumidified ambient air and then discharging the dehumidified ambient air to the air channel switching module through the miniature diaphragm pump.
In the large-range particulate matter detection device, the input end of the first filter is connected with the output end of the sensor through a phi 4 silica gel tube, the output end of the first filter is connected with the air suction nozzle of the micro diaphragm pump through a phi 6 silica gel tube, and the air discharge nozzle of the micro diaphragm pump is connected with the input end of the air path switching module through a phi 6 silica gel tube.
In the wide-range particulate matter detection device, the gas circuit switching module comprises a three-way valve, a first electromagnetic valve and a second electromagnetic valve; an inlet of the three-way valve is connected with an exhaust nozzle of the micro diaphragm pump, an outlet of the three-way valve is connected with an air inlet of the first electromagnetic valve, the other outlet of the three-way valve is connected with an air inlet of the second electromagnetic valve, an output end of the first electromagnetic valve is connected with the filtering module, and a power supply control end of the first electromagnetic valve and a power supply control end of the second electromagnetic valve are respectively and electrically connected with the controller;
the controller is used for controlling the on-off of the first electromagnetic valve and the second electromagnetic valve.
In the wide-range particulate matter detection device, an inlet of the three-way valve is connected with an exhaust nozzle of the micro diaphragm pump through a phi 6 silica gel pipe, an outlet of the three-way valve is connected with an air inlet of the first electromagnetic valve through the phi 6 silica gel pipe, the other outlet of the three-way valve is connected with an air inlet of the second electromagnetic valve through the phi 6 silica gel pipe, and an output end of the first electromagnetic valve is connected with the filtering module through the phi 6 silica gel pipe.
In the wide-range particulate matter detection device, the controller opens the first electromagnetic valve and closes the second electromagnetic valve when the controller is in a calibration mode or judges that the background value is larger than or equal to a preset value, and air in the three-way valve is transmitted to the filtering module through the first electromagnetic valve.
In the wide-range particulate matter detection device, the controller controls the first electromagnetic valve to be closed and the second electromagnetic valve to be opened in a normal monitoring mode, and air in the three-way valve is discharged into the air through the second electromagnetic valve.
In the wide-range particulate matter detection device, the filtering module comprises a flowmeter and a second filter, the air inlet end of the flowmeter is connected with the output end of the second electromagnetic valve, the air outlet end of the flowmeter is connected with the input end of the second filter, and the output end of the second filter is connected with the feedback air inlet end of the dehumidifier;
the flowmeter regulates the gas flow to control the gas volume of the discharged air, and the air is transmitted to the dehumidifier after being secondarily filtered by the second filter.
Compared with the prior art, the wide-range particulate matter detection device provided by the invention comprises a particulate matter cutter, a dehumidifier, a sensor, a controller, an exhaust module, a gas circuit switching module and a filtering module; after cutting the particles in the ambient air, the particle cutter outputs the ambient air to the dehumidifier for dehumidification; the sensor detects the concentration of particulate matters in dehumidified ambient air and feeds back a detection value to the controller; the air exhaust module carries out primary filtration on dehumidified ambient air and then discharges the dehumidified ambient air to the air channel switching module, the controller controls the air channel switching module to discharge the ambient air to the filtering module for filtering according to the detection value, the filtered ambient air is transmitted to the dehumidifier for diluting the concentration of particulate matters, and the ambient air flows through the sensor again for cleaning the sensor. The background value being larger than the preset value indicates that the sensor is polluted, clean air plays a role in cleaning the sensor, and the problem that an existing particulate matter online monitoring system cannot automatically clean the sensor can be solved.
Drawings
Fig. 1 is a schematic structural diagram of a wide-range particulate matter detection device provided by the invention.
Fig. 2 is a schematic view showing the placement of devices in the wide-range particulate matter detection device provided by the present invention.
Detailed Description
The invention provides a wide-range particulate matter detection device. In order to make the objects, technical solutions and effects of the present invention clearer and more specific, the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 and 2, the dashed line in fig. 1 indicates the air flow direction; the solid line indicates the electrical control direction. The arrowed lines in fig. 2 represent electrical cables and the black blocks represent silicone tubes. The wide-range particulate matter detection device provided by the embodiment of the invention comprises a particulate matter cutter 10, a dehumidifier 20, a sensor 30, a controller 40, a temperature and humidity detection module 41, exhaust modules (51 and 52), gas path switching modules (61, 62 and 63) and filtering modules (71 and 72). The output end of the particulate matter cutter is connected to the input end of the dehumidifier 20 through a silicone tube with the specification phi 6, the output end of the dehumidifier 20 is connected to the input end of the sensor 30 through a silicone tube with the specification phi 4, the output end of the sensor 30 is connected to the input end of the exhaust module through a silicone tube with the specification phi 4, the output ends of the exhaust modules (51, 52) are connected to the input ends of the air channel switching modules (61, 62, 63), one output end of the air channel switching modules (61, 62, 63) is connected to the feedback air inlet end of the dehumidifier 20 through the filtering modules (71, 72), and the other output end of the air channel switching modules (61, 62, 63) is the exhaust end of the whole air channel.
The controller 40 (preferably ES 80A-due) is connected to the dehumidifier 20, and the operation of the dehumidifier 20 is determined by the controller 40 according to the temperature and humidity monitoring value of the temperature and humidity detection module 41 (preferably DHT20 sensor), so that the dehumidification operation does not affect the gas passing through the dehumidifier. The controller 40 and the sensor 30 are connected by adopting a UART/RS232/RS485 interface, and the controller collects data of the sensor 30. The controller 40 is connected to the control ends of the exhaust modules (51, 52) and the gas path switching modules (61, 62, 63).
The particulate matter cutter 10 cuts particulate matters in the ambient air and then outputs the ambient air to the dehumidifier 20 for dehumidification; the sensor 30 detects the concentration of particulate matter in the dehumidified ambient air and feeds back the detected value to the controller 40; the exhaust module carries out first-stage filtration on the dehumidified ambient air and then discharges the dehumidified ambient air to the air path switching module, the controller 40 judges that the background value is larger than or equal to a preset value according to the detection value, the air path switching module is controlled to discharge the ambient air to the filtering module for filtering, the filtered ambient air is transmitted to the dehumidifier for diluting the concentration of the particulate matters, and the concentration of the diluted ambient air flows through the sensor again to clean the sensor. The controller 40 controls the air path switching module to discharge the ambient air into the air according to the detection value to judge that the background value is smaller than the preset value.
The background value is larger than a preset value, which indicates that the sensor is polluted, the air path of the air path switching module is changed, the environmental air after primary filtration is transmitted to the filtering module for secondary filtration, the clean air after double filtration returns to the dehumidifier to dilute the concentration of the particulate matters, the concentration of the particulate matters is detected by the sensor again, the detection value is fed back, the clean air has a cleaning effect on the sensor, and the problem that the existing particulate matter on-line monitoring system cannot automatically clean the sensor can be solved.
In this embodiment, the exhaust module comprises a first filter 51 and a micro diaphragm pump 52 (model VCL8401 is preferred); the input end of the first filter 51 is connected with the output end of the sensor 30 through a phi 4 silica gel tube, the output end of the first filter 51 is connected with the air suction nozzle of the micro diaphragm pump 52 through a phi 6 silica gel tube, the air suction nozzle of the micro diaphragm pump 52 is connected with the input end of the air path switching module through a phi 6 silica gel tube, and the power supply control end of the micro diaphragm pump 52 is connected with the controller 40 through a power supply control line. The first filter 51 performs primary filtration on the dehumidified ambient air to obtain clean air, and the clean air is discharged to the air path switching module through the micro diaphragm pump 52; the controller 40 controls the operating state (i.e., whether or not to begin operation) of the micro diaphragm pump 52.
The gas circuit switching module comprises a three-way valve 61, a first electromagnetic valve 62 and a second electromagnetic valve 63; the first port (inlet) of the three-way valve 61 is connected with the exhaust nozzle of the micro diaphragm pump 52 through a silicone tube with phi 6, the second port (outlet) of the three-way valve 61 is connected with the air inlet of the first electromagnetic valve 62 through a silicone tube with phi 6, the third port (other outlet) of the three-way valve 61 is connected with the air inlet of the second electromagnetic valve 63 through a silicone tube with phi 6, the output end of the first electromagnetic valve 62 is connected with the filter module through a silicone tube with phi 6, and the power supply control end of the first electromagnetic valve 62 and the power supply control end of the second electromagnetic valve 63 are respectively and electrically connected with the controller 40. The output end of the second electromagnetic valve 63 is the exhaust end of the whole air path. The controller 40 controls the on-off of the first solenoid valve and the second solenoid valve. Wherein only one of the first solenoid valve 62 and the second solenoid valve 63 is allowed to be energized at any time, the logic control is performed by the controller 40. The first solenoid valve 62 and the second solenoid valve 63 are preferably STNC TG22-08, solenoid valve DC24V.
Under normal monitoring conditions, the controller controls the first electromagnetic valve to be closed, the second electromagnetic valve to be opened, and the three-way valve 61 discharges air discharged by the micro diaphragm pump 52 into the air through the second electromagnetic valve. When the background value is greater than or equal to the preset value in calibration and judgment, the controller opens the first electromagnetic valve, closes the second electromagnetic valve, and air in the three-way valve 61 is transmitted to the filtering module through the first electromagnetic valve.
The filtering module comprises a flowmeter 71 (the model is preferably LZB-3 WBF) and a second filter 72, wherein the air inlet end of the flowmeter 71 is connected with the output end of the second electromagnetic valve 63 through a phi 6 silica gel pipe, the air outlet end of the flowmeter 71 is connected with the input end of the second filter 72 through a phi 6 silica gel pipe, and the output end of the second filter 72 is connected with the feedback air inlet end of the dehumidifier 20 through a phi 6 silica gel pipe. The flow meter regulates the gas flow to control the gas volume of the discharged air, which is transferred to the dehumidifier after secondary filtration by the second filter 72.
In this embodiment, the sensor 30 (model is preferably PPLS75 (H)) in the wide-range particulate matter detection device performs online monitoring of the particulate matter concentration by using a laser scattering method, and performs collection and monitoring by using a pump. The ambient air is detected by the sensor and then subjected to two-stage filtration. The primary filtration (realized by the first filter) has two functions, namely, the key components inside the micro diaphragm pump are protected from being polluted, and the service life of the micro diaphragm pump is prolonged; and secondly, filtering pollutants with particle sizes of more than 1 um. The exhaust port of the miniature diaphragm pump is additionally provided with a three-way valve, the three-way valve is respectively connected with two electromagnetic valves, and the second electromagnetic valve directly exhausts; the ambient air sequentially passes through the first electromagnetic valve and the flowmeter, is subjected to secondary filtration by the second filter and then returns to the air inlet of the heating air chamber in the dehumidifier. The two electromagnetic valves form two air paths under the control of an external controller, and the two air paths play different roles in different environments.
Because the miniature diaphragm pump is adopted, negative pressure is arranged in the air path in front of the pump, the air volume of clean air returned to the heating air chamber is controlled by adjusting the air flow of the flowmeter, the clean air can dilute high-concentration particles, and the normal concentration is calculated after the concentration is diluted, so that the on-line monitoring of the high-concentration particles is realized. The flowmeter is debugged when leaving the factory, and a user cannot debug in the subsequent use; when necessary, the system is debugged by professionals with relevant knowledge, such as after-sales maintenance personnel of factories.
In the embodiment, a three-way valve, two electromagnetic valves and a filter are added in the air path. Under the normal monitoring condition, the controller controls the first electromagnetic valve to be closed, and the second electromagnetic valve to be opened. The controller opens the first solenoid valve and closes the second solenoid valve during calibration, clean air filtered by the two filters returns to the inlet of the dehumidifier through the air path, the sensor at the rear end can detect clean air, and the actual detection value at the moment is theoretically 0, so that calibration is completed.
If the detection value is not 0, the fact that the sensor is internally polluted and the background value is generated is indicated, and the background value is subtracted from the actual detection value. The background value of the sensor is usually less than 5 when leaving the factory, the second electromagnetic valve 63 is closed by the controller 40 after working for a period of time, the first electromagnetic valve 62 is opened, detection is performed at this time, if the background value is less than 10, the sensor is considered to be in a normal condition, and if the background value is more than 20, the sensor is considered to have generated a background value which influences the detection result. The measured result can be more approximate to the true value through subtraction; assuming an actual detection value of 100, but a value in air of 60 and a background value generated by the sensor of 40, the actual detection value (100) minus the background value (40) is equal to the detection value (60). When the background value is high to a certain degree, the sensor is considered to be seriously polluted, and at the moment, the first electromagnetic valve is required to be opened, the second electromagnetic valve is required to be closed, and reverse blowing work is carried out. After the back purge is performed for a preset time, the controller continues to calibrate until the self calibration is within a theoretically acceptable error range. If calibration return to 0 is still not achieved after multiple back purges are performed, the controller sends out a response signal (such as an alarm sound) for manual cleaning and after-sales service.
In this embodiment, the implementation flow of the wide-range detection is as follows: according to the existing conventional method, the controller judges that the condition of exceeding the range (such as data above 10mg/m < 3 >) occurs, opens the first electromagnetic valve and adjusts the flow of the flowmeter (such as increasing the volume of gas) so as to dilute the high-concentration particulate matters, dilute the high-concentration particulate matters until the detection value is very long or smaller, automatically fit the linear relation through the test value according to the dilution multiple and the calibration, and then calculate according to the obtained linear relation, so that the value of the high-concentration particulate matters can be indirectly obtained.
In summary, according to the wide-range particulate matter detection device provided by the invention, when the background value is judged to be greater than the preset value by the controller, the sensor is identified to be polluted, the gas path can be automatically changed, the air subjected to primary filtration is subjected to secondary filtration again, the clean air subjected to double filtration returns to the dehumidifier to dilute the concentration of particulate matters, the sensor is cleaned when the clean air flows through the sensor again, and the sensor is cleaned by back blowing for many times, so that the problem that the existing particulate matter online monitoring system cannot automatically clean the sensor can be solved.
The above-mentioned division of the functional modules is only for illustration, and in practical application, the above-mentioned functional allocation may be implemented by different functional modules according to need, that is, by dividing the functional allocation into different functional modules to implement all or part of the functions described above.
It will be understood that equivalents and modifications will occur to those skilled in the art in light of the present invention and their spirit, and all such modifications and substitutions are intended to be included within the scope of the present invention as defined in the following claims.
Claims (8)
1. The wide-range particulate matter detection device comprises a particulate matter cutter and a dehumidifier, and is characterized by further comprising a sensor, a controller, an exhaust module, a gas circuit switching module and a filtering module;
the output end of the particulate matter cutter is connected with the input end of the dehumidifier, the output end of the dehumidifier is connected with the input end of the sensor, the output end of the sensor is connected with the input end of the exhaust module, the output end of the exhaust module is connected with the input end of the gas circuit switching module, one output end of the gas circuit switching module is connected with the feedback gas end of the dehumidifier through the filtering module, and the other output end of the gas circuit switching module is the exhaust end of the whole gas circuit; the controller is electrically connected with the dehumidifier, the sensor, the exhaust module and the corresponding control port of the air path switching module;
the controller controls the working state of the dehumidifier according to the monitoring value of the temperature and the humidity detected by the temperature and humidity detection module, and the particulate matter cutter outputs the ambient air to the dehumidifier for dehumidification after cutting the particulate matters in the ambient air; the sensor detects the concentration of particulate matters in dehumidified ambient air and feeds back a detection value to the controller; the exhaust module carries out primary filtration on the dehumidified ambient air and then discharges the dehumidified ambient air to the air channel switching module, the controller judges that the sensor is polluted when the background value is larger than or equal to a preset value according to the detection value, reverse blowing is carried out, the air channel of the air channel switching module is controlled, the ambient air subjected to primary filtration is discharged to the filtering module for secondary filtration, the double-filtered ambient air is transmitted to the concentration of diluted particles in the dehumidifier, the diluted ambient air flows through the sensor again to clean the sensor, and the sensor is cleaned through multiple reverse blowing;
the gas circuit switching module comprises a three-way valve, a first electromagnetic valve and a second electromagnetic valve; an inlet of the three-way valve is connected with an exhaust nozzle of a miniature diaphragm pump in the exhaust module, an outlet of the three-way valve is connected with an air inlet of the first electromagnetic valve, the other outlet of the three-way valve is connected with an air inlet of the second electromagnetic valve, an output end of the first electromagnetic valve is connected with the filter module, and a power supply control end of the first electromagnetic valve and a power supply control end of the second electromagnetic valve are respectively and electrically connected with the controller;
the controller is used for controlling the on-off of the first electromagnetic valve and the second electromagnetic valve;
the filter module comprises a flowmeter and a second filter, wherein the air inlet end of the flowmeter is connected with the output end of the first electromagnetic valve, the air outlet end of the flowmeter is connected with the input end of the second filter, and the output end of the second filter is connected with the feedback air inlet end of the dehumidifier;
the flowmeter regulates the gas flow to control the gas volume of the discharged air, and the air is transmitted to the dehumidifier after being secondarily filtered by the second filter;
the controller judges that the overscan appears, opens the first electromagnetic valve and adjusts the flow of the flowmeter, dilutes the high-concentration particulate matters to one tenth of the detection value, automatically fits the linear relation through the test value according to the dilution multiple and the calibration, and calculates according to the obtained linear relation to obtain the value of the high-concentration particulate matters.
2. The wide-range particulate matter detection device of claim 1, wherein the output end of the particulate matter cutter is connected with the input end of the dehumidifier through a silicone tube with a specification of phi 6, the output end of the dehumidifier is connected with the input end of the sensor through a silicone tube with a specification of phi 4, the output end of the sensor is connected with the input end of the exhaust module through a silicone tube with a specification of phi 4, and the controller is connected with the sensor through a communication interface.
3. The wide-range particulate matter detection device of claim 1, wherein the controller further controls the air path switching module to exhaust the ambient air into the air according to the detection value determining that the background value is smaller than a preset value.
4. A wide range particulate matter detection device according to claim 3, wherein the exhaust module comprises a first filter and a micro diaphragm pump; the input end of the first filter is connected with the output end of the dehumidifier, the output end of the first filter is connected with the air suction nozzle of the micro diaphragm pump, the air discharge nozzle of the micro diaphragm pump is connected with the input end of the air path switching module, and the power supply control end of the micro diaphragm pump is electrically connected with the controller;
the first filter is used for carrying out primary filtration on dehumidified ambient air and then discharging the dehumidified ambient air to the air channel switching module through the miniature diaphragm pump.
5. The wide-range particulate matter detecting device according to claim 4, wherein the input end of the first filter is connected with the output end of the sensor through a silicone tube with phi 4, the output end of the first filter is connected with the air suction nozzle of the micro diaphragm pump through a silicone tube with phi 6, and the air discharge nozzle of the micro diaphragm pump is connected with the input end of the air path switching module through a silicone tube with phi 6.
6. The wide-range particulate matter detecting device according to claim 4, wherein an inlet of the three-way valve is connected with an exhaust nozzle of the micro diaphragm pump through a silicone tube of phi 6, an outlet of the three-way valve is connected with an air inlet of the first electromagnetic valve through a silicone tube of phi 6, another outlet of the three-way valve is connected with an air inlet of the second electromagnetic valve through a silicone tube of phi 6, and an output end of the first electromagnetic valve is connected with the filtering module through a silicone tube of phi 6.
7. The wide-range particulate matter detection device of claim 4, wherein the controller opens the first solenoid valve and closes the second solenoid valve when the controller is in the calibration mode or when the controller determines that the background value is greater than or equal to the predetermined value, and air in the three-way valve is transferred to the filter module through the first solenoid valve.
8. The wide-range particulate matter detection device of claim 4, wherein the controller controls the first solenoid valve to close and the second solenoid valve to open in a normal monitoring mode, and air in the three-way valve is discharged into the air through the second solenoid valve.
Priority Applications (1)
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| CN110441484A (en) * | 2019-09-23 | 2019-11-12 | 深圳市无眼界科技有限公司 | A kind of detection device and detection system of air gaseous pollutant |
| CN110987739B (en) * | 2019-12-27 | 2022-08-02 | 厦门通创检测技术有限公司 | Particulate matter analyzer for engine |
| CN113483433A (en) * | 2021-07-12 | 2021-10-08 | 韦氏（苏州）医疗科技有限公司 | Medical logistics management system |
| CN114279916A (en) * | 2021-12-27 | 2022-04-05 | 河北先河环保科技股份有限公司 | Zero calibration method for particulate matter sensor |
| CN114877938B (en) * | 2022-05-12 | 2023-05-02 | 机械工业仪器仪表综合技术经济研究所 | Monitoring element and device for air particulate matters in cavern |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201298012Y (en) * | 2008-09-26 | 2009-08-26 | 朱一川 | Microcomputer laser dust monitor |
| CN104677796A (en) * | 2015-03-18 | 2015-06-03 | 深圳睿境环保科技有限公司 | Ultra-low concentration particulate matter online monitoring instrument and monitoring method |
| CN104819919A (en) * | 2015-05-20 | 2015-08-05 | 北京曼德克环境科技有限公司 | Detector for content of discharged particulate matter |
| CN105116433A (en) * | 2015-09-24 | 2015-12-02 | 东华理工大学 | Portable radon measuring instrument calibrator |
| CN205027639U (en) * | 2015-10-14 | 2016-02-10 | 北京绿林环创科技有限公司 | Bitangent cutter dust concentration monitoring system with self -correcting at zero point and humidity correction |
| CN205384207U (en) * | 2016-02-23 | 2016-07-13 | 汇众翔环保科技河北有限公司 | High sensitivity particulate matter laser monitor based on dilution method |
| CN105910965A (en) * | 2016-05-19 | 2016-08-31 | 中国科学院大气物理研究所 | Humidity adjusting device and method of aerosol collection sample feeding gas flow and measurement instrument |
| CN206339465U (en) * | 2016-12-28 | 2017-07-18 | 广州铭沁环保科技有限公司 | A kind of binary channels air detection instrument |
| CN108760989A (en) * | 2018-06-05 | 2018-11-06 | 深圳市无眼界科技有限公司 | A kind of air-quality monitoring system and its monitoring method |
| CN108760415A (en) * | 2018-08-13 | 2018-11-06 | 北京大学 | More grain size sections automatically switch sampling apparatus for atmospheric particulate matter and the automatic method of sampling |
| CN209485927U (en) * | 2019-01-22 | 2019-10-11 | 深圳市无眼界科技有限公司 | A kind of wide range particulate matter detection means |
-
2019
- 2019-01-22 CN CN201910059811.1A patent/CN109557009B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201298012Y (en) * | 2008-09-26 | 2009-08-26 | 朱一川 | Microcomputer laser dust monitor |
| CN104677796A (en) * | 2015-03-18 | 2015-06-03 | 深圳睿境环保科技有限公司 | Ultra-low concentration particulate matter online monitoring instrument and monitoring method |
| CN104819919A (en) * | 2015-05-20 | 2015-08-05 | 北京曼德克环境科技有限公司 | Detector for content of discharged particulate matter |
| CN105116433A (en) * | 2015-09-24 | 2015-12-02 | 东华理工大学 | Portable radon measuring instrument calibrator |
| CN205027639U (en) * | 2015-10-14 | 2016-02-10 | 北京绿林环创科技有限公司 | Bitangent cutter dust concentration monitoring system with self -correcting at zero point and humidity correction |
| CN205384207U (en) * | 2016-02-23 | 2016-07-13 | 汇众翔环保科技河北有限公司 | High sensitivity particulate matter laser monitor based on dilution method |
| CN105910965A (en) * | 2016-05-19 | 2016-08-31 | 中国科学院大气物理研究所 | Humidity adjusting device and method of aerosol collection sample feeding gas flow and measurement instrument |
| CN206339465U (en) * | 2016-12-28 | 2017-07-18 | 广州铭沁环保科技有限公司 | A kind of binary channels air detection instrument |
| CN108760989A (en) * | 2018-06-05 | 2018-11-06 | 深圳市无眼界科技有限公司 | A kind of air-quality monitoring system and its monitoring method |
| CN108760415A (en) * | 2018-08-13 | 2018-11-06 | 北京大学 | More grain size sections automatically switch sampling apparatus for atmospheric particulate matter and the automatic method of sampling |
| CN209485927U (en) * | 2019-01-22 | 2019-10-11 | 深圳市无眼界科技有限公司 | A kind of wide range particulate matter detection means |
Non-Patent Citations (3)
| Title |
|---|
| 大气自动监测站运行中的常见故障及解决方法;陈曦;;环境与生活(第06期);16-17、19 * |
| 湿度修正的光散射法在现场粉尘监测中的应用;姜万录;《仪器仪表学报》;200-207 * |
| 湿度对光散射粉尘仪测量结果的影响;张国城;《测量与设备》;7-9 * |
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