CN106716106B - Micronic dust measuring device based on microbalance - Google Patents
Micronic dust measuring device based on microbalance Download PDFInfo
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- CN106716106B CN106716106B CN201580051274.6A CN201580051274A CN106716106B CN 106716106 B CN106716106 B CN 106716106B CN 201580051274 A CN201580051274 A CN 201580051274A CN 106716106 B CN106716106 B CN 106716106B
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- Prior art keywords
- filter holder
- micronic dust
- filter
- filter paper
- free end
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
- G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
- G01G3/16—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing measuring variations of frequency of oscillations of the body
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
Abstract
The present invention relates to a kind of automatic replacement filter paper, the micronic dust measuring device based on microbalance that can continuously detect micronic dust concentration or be calibrated automatically using calibrating weight.The present invention is based on the filter holder mounting plates of the micronic dust measuring device of microbalance to be equipped with multiple measurement of concetration filter holders with filter paper and the coefficient of relationship for obtaining between micronic dust quality and vibration frequency --- the counterweight filter holder of mass transfer coefficient, and filter holder is replaced by the rotation of filter holder mounting plate, and be installed on the free end of vibrating tube.
Description
Technical field
The present invention relates to a kind of automatic replacement filter paper, can continuously detect micronic dust concentration or carry out school automatically using calibrating weight
The quasi- micronic dust measuring device based on microbalance.
Background technique
Suspension in air is generally 0.1 μm to 100 μm of polydispersion distribution in partial size, and containing there are many chemistry
Component.Especially micronic dust can directly or indirectly influence human health, endanger animals and plants, reduce visibility, to become atmosphere
The hot research object of chemical field.Related micronic dust project is included into atmospheric environment benchmark project, in order to improve atmospheric environment and
Carrying out coherent detection and management.
Research initial stage, researcher are directed generally to TSP(total suspended particulate) management project,
But with the enhancing of health care consciousness, start to research and develop in relation to micronic dust, i.e. PM10(partial size 10um or less) management project, and in recent years,
Due to PM2.5(partial size 2.5um or less) it is more serious to harm caused by human body, while PM2.5 is incorporated into management
Project.Currently, PM1 problem of management just gradually attracts attention.
In order to manage micronic dust PM10, PM2.5, PM10, PM1, need using micronic dust measuring device.
Currently, representative micronic dust measurement method has filter paper method, β attenuation sensors (Beta-ray
Attenuation Methed:BAM) and microbalance method (Tapered Element Oscillation Microbalance
Mass Measurement Method:TEOM).Wherein, microbalance method be uniquely can continuous automatic measurement micronic dust concentration, can
The method of Direct Measurement of Heavy amount.
Fig. 1 is the existing micronic dust measuring device structural schematic diagram based on microbalance.
Common microbalance method (TEOM), such as US granted patent 4391338 and Japan authorized patent the 3354217th
Described in, the cone-shaped vibrating tube 10 being usually gradually increased from the bottom to top using axial diameter, the lower end of this vibrating tube 10
For fixing end 12 for fixing, upper end is free end 11.The free end 11 of vibrating tube 10 is equipped with the filter paper with filter paper 70
Folder 60, after the sample air entered by sample cell 30 obtains filtering by filter paper 70,11 row of free end by vibrating tube 10
It puts hollow to vibrating tube 10.Under normal circumstances, the boring of vibrating tube 10 and 40 phase of curved tube for being connected to aspiration pump
Connection, so as to flow sample air.
As sample air is through filter paper 70, the micronic dust that filter paper 70 is collected be will increase, with the increase matter of micronic dust collecting amount
Amount will increase, and causing to be formed by eigentone by the resonance of vibrating tube 10 can be gradually reduced.Utilize eigentone
Relationship between quality monitors micronic dust mass change amount, collects trend to can measure micronic dust, collects in cumulant and atmosphere
Micronic dust concentration.
In addition, according to the structure and material characteristic, eigentone and matter of vibrating tube 10, filter holder 60, filter paper 70 etc.
The coefficient value of relationship changes between amount, therefore, after the filter holder used as counterweight is mounted on the free end of vibrating tube, leads to
Measurement eigentone is crossed to obtain coefficient, and is calibrated.
But the filter holder for being calibrated or being measured micronic dust collecting amount need to be mounted on the free end 11 of vibrating tube 10,
And existing micronic dust measuring device can only carry out it is manually installed.Then, calibration error is larger, currently, in South Korea's form identification
In eliminate PM2.5 automatic measuring instrument.In addition, measuring the journey of micronic dust when the micronic dust being deposited on filter paper reaches certain amount
Sequence can be automatically stopped, and therefore, in actual use, user will manually replace filter paper at regular intervals, thus not
Convenient for continuously and automatically measuring, and may be difficult to ensure detection data because depositing excessive micronic dust on a filter paper can
By property.
(existing technical literature)
(patent document)
(patent document 1) US4391338A 1983.07.05
(patent document 2) JP3354217 B2 2002.09.27.
Summary of the invention
The purpose of the present invention is to overcome the above shortcomings and to provide one kind to carry out school by installing counterweight automatically with filter holder
Standard, in due course between replace filter paper automatically, the continuous micronic dust measuring device based on microbalance for measuring micronic dust concentration.
To achieve the goals above, this invention takes following technical solutions.
The present invention is based on the end of the sample cell of the micronic dust measuring device of microbalance and it is installed on the vibration of hollow cone shape
The filter holder of the free end of pipe is opposite and sets, through the sample air of sample cell inflow after the filter paper of filter holder obtains filtering,
The boring of vibrating tube is emitted by free end, after the vibration that vibrating tube is caused by controller, measurement intrinsic vibration frequency
The changing value of rate measures the micronic dust quality collected by filter paper with this, and the micronic dust measuring device based on microbalance includes: installation
Have and has filter paper and be used to collect micronic dust, measure the measurement of concetration filter holder of quality and quality and vibration for obtaining micronic dust
The filter holder mounting plate of the counterweight filter holder of coefficient of relationship between frequency --- mass transfer coefficient；And under the control of the controller
Mobile filter holder mounting plate, is installed in the state of free end after counterweight is moved to free end with filter holder, solid by measuring
There is vibration frequency calibrating quality transformation coefficient, and be installed on free end after measurement of concetration is moved to free end with filter holder, and surveys
Measure the stepper motor of micronic dust quality.
For the counterweight with filter paper is not provided in filter holder, the controller, which is utilized, is mounted on free end with filter holder for counterweight
When the eigentone measured, the eigentone that measures when measurement of concetration is mounted on free end with filter holder and filter paper
Quality obtain mass transfer coefficient.
The filter holder mounting plate is equipped at least two measurement of concetration filter holders, and the controller passes through control
At least two measurement of concetrations are sequentially arranged at free end with filter holder by stepper motor, are used for micronic dust mass measurement to replace
Filter paper, and collect micronic dust and measurement quality.
The present invention is based on the end of the sample cell of the micronic dust measuring device of microbalance and it is installed on the vibration of hollow cone shape
The filter holder of the free end of pipe is opposite and sets, through the sample air of sample cell inflow after the filter paper of filter holder obtains filtering,
The boring of vibrating tube is emitted by free end, after the vibration that vibrating tube is caused by controller, measurement intrinsic vibration frequency
The changing value of rate measures the micronic dust quality collected by filter paper with this, and the micronic dust measuring device based on microbalance includes: installation
Have at least two with filter paper and the filter holder mounting plate for collecting micronic dust, the measurement of concetration filter holder for measuring quality；And
At least two measurement of concetrations are sequentially arranged at vibration with filter holder by mobile filter holder mounting plate under the control of the controller
The stepper motor for measuring the filter paper of micronic dust quality is replaced in the free end of pipe.
At least one of at least two measurement of concetration filter holders for being installed on the filter holder mounting plate are for obtaining
Coefficient of relationship between micronic dust quality and vibration frequency --- the counterweight filter holder of mass transfer coefficient, the controller pass through control
Stepper motor processed is installed in the state of free end after counterweight is moved to free end with filter holder, measures eigentone,
With calibrating quality transformation coefficient, later, filter paper is replaced, the quality of micronic dust is measured.
Counterweight is mounted on free end with filter holder according to the preset period by the controller, with calibrating quality transformation series
Number.
When the quality of micronic dust is more than that preset quantity or eigentone are less than preset value, by the controller into
Row control, to replace filter paper.
The vibrating tube is fixed under the action of servomotor on vertical shift block moving up and down, filter holder
Bottom surface is equipped with hollow bushing of the perforation for installing the upper surface of filter paper center and extending downwardly, and the free end of vibrating tube is inserted in casing
It is interior, so that filter holder is installed on free end, free end is injected and covered by control servomotor and stepper motor by the controller
Pipe lifts the filter holder mobile to free end top from filter holder mounting plate, and later, measurement micronic dust is collected or quality, leads to
Decline free end is crossed, extracts it from casing out, after filter holder is mounted on filter holder mounting plate, passes through mobile filter holder installation
Plate replaces filter paper.
The controller promotes free end by control servomotor, lifts filter holder, and closely covers sample with filter paper
Behind quality control end, sample air is collected by filter paper and is passed through when filter holder is between sample tube end and filter holder mounting plate
Measure the quality of eigentone measurement micronic dust.
Equipped with the sealing ring for encasing sample tube end, when through filter paper filtered sample air, collection micronic dust, in filter holder
The edge of edge or filter paper compresses sealing ring, to be sealed.
The filter holder mounting plate is in disk form, above be equipped with along same radius circumferencial direction with radial distribution extremely
Few two longitudinal openings, the mounting hole for installing filter holder, are rotated under the action of stepper motor, to make at least two
A filter holder is successively moved to the free end of vibrating tube.
The present invention is based on the micronic dust measuring devices of microbalance to be mounted on filter holder mounting plate at least two filter holders, uses
It is mounted on the filter holder of vibrating tube free end in replacement, therefore, does not replace the measurement of concetration filter holder for having filter paper manually,
And it can continuously be measured by successively moving and installing measurement of concetration with filter holder；Whenever needing to calibrate, pass through movement
It is calibrated automatically with installation counterweight with filter holder, so as to accurately measure micronic dust concentration.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the existing micronic dust measuring device based on microbalance.
Fig. 2 is the structural schematic diagram of the micronic dust measuring device the present invention is based on microbalance.
Fig. 3 is the longitudinal sectional view of the micronic dust measuring device the present invention is based on microbalance.
Fig. 4 is the transverse sectional view of the micronic dust measuring device the present invention is based on microbalance.
Fig. 5 is the partial exploded view of the micronic dust measuring device the present invention is based on microbalance.
Schematic diagram when Fig. 6 is filter holder and the filter paper separation in Fig. 5 on filter holder mounting plate.
Fig. 7 is longitudinal sectional view when replacing filter paper the present invention is based on the micronic dust measuring device of microbalance.
Fig. 8 is longitudinal sectional view when the present invention is based on the micronic dust measuring devices of microbalance by filter paper collection micronic dust.
Fig. 9 is the micronic dust mass change feelings being collected on filter paper the present invention is based on the micronic dust measuring device measurement of microbalance
Longitudinal sectional view when condition.
In attached drawing:
10: vibrating tube；11: free end；12: fixing end；13: interior hollow；20: vibration frequency measuring device；21: vibration
Part；22: vibration hammer；23: vibrating sensor；30: sample cell；40: curved tube；50: filter holder mounting plate；51: mounting hole；60: dense
Spend measurement filter holder；60a: counterweight filter holder；61: casing；62: filter paper mounting groove；70: filter paper；100: bracket；110: branch
Bracer；111: mounting plate socket；112: sample cell socket；113: vibrating tube socket；114: vibrating member socket；115: vibrating sensing
Device socket；116: sealing ring 120: stepper motor；130: guiding block；140: servomotor；150: vertical shift block；151: interior
Channel；200: controller；210: cable.
Specific embodiment
Preferred embodiment of the present invention will be described with reference to the accompanying drawing, so as to one skilled in the art's reality
It applies.
Fig. 2 to Fig. 6 is the attached drawing for illustrating the micronic dust measuring device the present invention is based on microbalance.Fig. 2 is that structure is shown
It is intended to, Fig. 3 is longitudinal sectional view, and Fig. 4 is transverse sectional view, and Fig. 5 is partial exploded view, and Fig. 6 is that filter holder is installed in Fig. 5
Schematic diagram when filter holder and filter paper on plate separate.
As shown in Figures 2 to 6, it the present invention is based on the micronic dust measuring device of microbalance, is equipped with and is used on bracket 100
The vibrating tube 10 of filter holder 60 is installed, the vibration frequency measuring device 20 of eigentone for measuring vibrating tube 10, is used
In the sample cell 30 of supply sample air, the curved tube 40 for the sample air filtered to be discharged and at least two filter paper are installed
60,60a filter holder mounting plate 50 are pressed from both sides, filter paper replacement can be carried out automatically under the action of controller 200, micronic dust is collected, micronic dust matter
Measure measure of the change and calibration.
The bracket 100 includes supporting block 110, guiding block 130, vertical shift block 150.
The vertical shift block 150 is vertically and fixedly provided with above to be gradually become smaller from the bottom to top by the fixed diameter of fixing end 12
Conical hollow tubulose vibrating tube 10, and be equipped with and can make interior hollow 13 internal channels 151 being connected with curved tube 40 of vibrating tube 10.
The internal channel 151 is connected with the curved tube 40.
The guiding block 130 moves up and down for guiding the vertical shift block 150, due to being equipped with by controller 200
Therefore the servomotor 140 of control can drive vertical shift block 150 to move up and down by servomotor 140.
Vibration frequency measuring device 20, sample cell 30, filter holder mounting plate 50 are installed in the supporting block 110 and are used for
The stepper motor 120 of driving filter holder mounting plate 50 mobile (embodiment of the present invention is rotation).The supporting block 110 is located at up and down
The top of movable block 150, the end of sample cell 30, freedom of the end in vertical direction and vibrating tube 10 that sample air is discharged
End 11 is opposite, by movement (rotation) filter holder mounting plate 50, makes at least two filter paper being installed on filter holder mounting plate 50
Folder 60,60a are sequentially located between the free end 11 of vibrating tube 10 and the end of sample cell 30.
Specifically, the supporting block 110 is equipped with vibrating tube socket 113, sample cell socket 112, vibrating member socket 114
With vibrating sensor socket 115 and mounting plate socket 111.The vibrating tube socket 113 for being inserted into vibrating tube from the bottom to top
10, and with vibrating tube 10 outside it is intermarginal there are gaps, to be easily inserted vibrating tube 10, and vibrating tube 10 is made to be free to carry out
It moves up and down and vibrates；The sample cell socket 112 is set to the vertical direction top of vibrating tube socket 113, inserts with vibrating tube
There are gaps between the upper end of mouth 113, when being inserted into sample cell 30 from upper part, the lower end of sample cell 30 and the freedom of vibrating tube 10
End 100 is opposite and is spaced relationship to；The vibrating member socket 114 and vibrating sensor socket 115 are with the height lower than gap
Degree is set to the two sides of width direction, is connected respectively with vibrating tube socket 113；The mounting plate socket 111 is used for from front
It is inserted into filter holder mounting plate 50, at least one filter holder 60 for being installed on filter holder mounting plate 50 is made to be configured at sample cell socket
In gap between 112 113 upper end of lower end and vibrating tube socket, and its there are gaps in-between, filter holder is installed
Plate 50 can easily move (rotation), by movement (rotation) filter holder mounting plate 50, will be installed on filter holder mounting plate 50
On at least two filter holders 60,60a configures in order between 113 upper end of 112 lower end of sample cell socket and vibrating tube socket
In gap.
In the embodiment of the present invention, the upper surface of the filter holder 60,60a are equipped with the filter paper mounting groove for plugging filter paper 70
62, it is equipped with hollow tubular casing 61 below.The bottom centre of filter paper mounting groove 62 is run through, the boring phase with casing 61
Connection.Described sleeve pipe 61 is used to be inserted into the free end 11 of vibrating tube 10, when vibrating tube 10 is glass tube, easily during insertion
By breakage.Therefore, the lower inner edge of described sleeve pipe 61 is equipped with for encasing the outer peripheral liner 11a in free end 11.It is described
Liner 11a is also securable to free end 11, it also has the function of that free end 11 can be made more steadily to be plugged in casing 61.
The filter holder mounting plate 50 is equipped with longitudinal opening, in disk form, is equipped at least two above from center along phase
With the mounting hole 51 of radial distribution, the mounting hole 51 has to be used to block filter holder 60, the bottom 60a circumferencial direction with radius
The rib at face edge.When filter holder 60,60a are mounted on one by one in respective mounting hole 51, the casing 61 of each filter holder is inserted
Expose in mounting hole 51 and downwards.
Using the vertical axis parallel with the perpendicular directional line of connection vibrating tube socket 113 and sample cell socket 112 as in
Filter holder mounting plate 50 as described above is placed in the horizontal plane, and is installed in supporting block 110 by axis, and guarantee has one
A mounting hole 51 is in the gap between vibrating tube socket 113 and sample cell socket 112.Whenever filter holder mounting plate 50 is in step
The angle rotated under into the drive of motor 120 is equal to the central angle for forming adjacent mounting hole 51 under the control of the controller 200
Gap when spending, between vibrating tube socket 113 and sample cell socket 112, that is, be located at 10 free end 11 of vibrating tube and sample
Mounting hole 51 between 30 lower end of pipe successively converts.In other words, it is arranged in at least two of filter holder mounting plate 50 with radial
Filter holder 60,60a are successively moved in turn between 30 lower end of free end 11 and sample cell of vibrating tube 10.
For be inserted into a part of the filter holder mounting plate 50 and can make its rotate mounting plate socket 111 it is high up and down
Degree is slightly larger than the thickness of filter holder mounting plate 50.
At least two filter holders 60, the 60a for being installed on filter holder mounting plate 50 are divided into equipped with filter paper 70, can carry out micronic dust
Collect and measurement of concetration at least two measurement of concetration filter holders 60 and for obtaining the pass between micronic dust quality and vibration frequency
At least one counterweight filter holder 60a of coefficient --- mass transfer coefficient.
In the embodiment of the present invention, the counterweight not set filter paper 70 of filter holder 60a, therefore, with the measurement of concetration for being equipped with filter paper
It is compared with filter holder 60, quality is smaller, and the difference of the two quality is the quality of filter holder 60.It is of poor quality using this, pass through control
Device 200 processed obtains mass transfer coefficient.
In addition, being arranged filter holder mounting plate 50 and sample cell 30 in supporting block 110, it will uprightly be fixed on vertical shift block
The top of vibrating tube 10 above 150 is inserted in vibrating tube socket 113, and the top of the lower end and vibrating tube 10 that make sample cell 30 is certainly
By end 11, vertically vertical direction is set relatively, is equipped in gap therebetween as the rotation of filter holder mounting plate 50 is successively replaced
Filter holder 60,60a.
To be installed on the top of lower end and vibrating tube 10 that the state of filter holder mounting plate 50 configured in sample cell 30 certainly
By filter holder 60, the 60a between end 11 in gap, with moving up and down for vertical shift block 150, by the free end of vibrating tube 10
11 are inserted into the casing 61 of filter holders 60,60a, and are raised from filter holder mounting plate 50, to make it not contact sample cell
30 degree is in suspended state.It, can be with when filter holder 60,60a are the measurement of concetration filter holder 60 for being equipped with filter paper 70
Increase lifting heights, filter paper 70 is made to be tightly attached to end and the covering of sample cell 30.By lower general who has surrendered's filter holder 60 of vibrating tube 10,
60a is mounted in the mounting hole 51 of filter holder mounting plate 50, and 10 free end 11 of vibrating tube is made to be detached from casing 61.At this point, rotation
Filter holder mounting plate 50 can be to avoid being stuck in vibrating tube 10.
The sample cell 30 is solidly plugged in sample cell socket 112, until the end of sample cell 30 reaches lower end.Lower end is equipped with
Encase the sealing ring 116 of 30 end of sample cell.It, can be by sealing ring 116 in the state of covering 30 end of sample cell with filter paper 70
It is tightly attached to the edge of filter holder 60 or the edge of filter paper 70, filter paper 70, again is passed through from sample cell 30 with this sealed sample air
Pass through the casing 61 of filter holder 60 to the channel of 10 boring of vibrating tube.
In the embodiment of the present invention, vibrating member of the vibration frequency measuring device 20 from applying vibration to the top of vibrating tube 10
21,10 top of vibrating tube, which is set to, corresponding to vibrating member 21 applies the position of vibration, for receiving the application of vibrating member 21 to it
The vibration hammer 22 of vibration, and the vibrating sensor 23 of the eigentone for detecting vibrating tube 10 are constituted.Here, vibrating member
21 and vibrating sensor 23 be made of the piezoelectric element as employed in Japan authorized patent the 3354217th, to vibrating sensing
After the vibration for the frequency that device 23 incudes amplifies, it is applied to vibrating tube 10 using vibrating member 21, is formed based on the intrinsic of resonance
Vibration frequency detects eigentone with this.
The vibrating member 21 and vibrating sensor 23 of the vibration frequency measuring device 20 pass through vibrating member socket 114 and vibration
Supporting block 110 is run through in the two sides of sensor socket 115 in the width direction, and is inserted in vibrating tube socket 113 across its end
Interior vibrating tube 10 is opposite and sets.And the position phase set opposite with the vibrating member 21 and vibrating sensor 23 in vibrating tube 10
Corresponding position is fixed with vibration hammer 22, to detect eigentone by vibration frequency measuring device 20.
Controller 200 by cable 210 in a manner of electric signal with vibrating member 21, vibrating sensor 23, stepper motor 120 and
Servomotor 140 is connected, to control the movements such as calibration, micronic dust collection, the measurement of micronic dust mass change and filter paper replacement.For
This, controller 200 is by the miniature calculating that can be controlled according to the execution program of each movement the component connected by cable 201
Mechanism at.
It is set with measurement of concetration filter holder 60 and counterweight in controller 200 and is installed on filter holder installation with filter holder 60a
Location information on plate 50.Wherein, the installation site information of measurement of concetration filter holder 60 is set according to sequence, because
This, when being calibrated, after being moved to the free end 11 of vibrating tube 10 with filter holder 60a by counterweight and be installed on free end 11, into
The row calibration；Measurement of concetration is successively moved to the free end 11 of vibrating tube 10 with filter holder 60 and is installed on free end 11
Afterwards, the micronic dust collection and the measurement of micronic dust mass change are carried out, filter paper replacement is then carried out.
Firstly, the micronic dust based on microbalance measures the quality that applied principle is conical component and conical component is intrinsic
Vibration frequency f's square is inversely proportional.According to this principle, the micronic dust mass change amount △ m for being collected in filter paper 70 can be by following
Mathematical formulae calculates.
Formula 1
In formula, △ m indicates the micronic dust mass change amount being collected into；f0It indicates to survey before the mass change amount of △ m generates
The vibration frequency obtained；F indicates that the mass change amount of △ m generates the vibration frequency measured later；K is mass transfer coefficient, is used for
Indicate the relationship between quality m and the inverse of vibration frequency square.
Mass transfer coefficient k can be different by distinguishing installation quality in the free end of conical component vibrating tube 10 11
Filter holder obtains to measure vibration frequency by calculating in its result substitution above-mentioned formula 1.
At least two measurement of concetrations with filter paper 70 are installed to filter on the filter holder mounting plate 50 of the embodiment of the present invention
Folder 60 is at least one without the counterweight filter holder 60a of filter paper 70.It can be by will be without the counterweight of filter paper filter holder 60a
Vibration frequency is measured after being installed on the free end 11 of vibrating tube 10 and will be collected micronic dust before or is not used for measuring the concentration of concentration
Measurement filter holder 60 measures vibration frequency after being installed on the free end 11 of vibrating tube 10, and calculates pledge using following equation 2
Change of variable coefficient k.Here, calculating the collection mass change amount of micronic dust using counted mass transfer coefficient k.
Formula 2
In formula 2, M indicates the quality of filter paper 70；f1It indicates to install the measurement of concetration filter holder 60 with filter paper 70
The vibration frequency measured when free end 11, f2Expression will be installed on free end 11 with filter holder 60a without the counterweight of filter paper 70
When the vibration frequency that measures.It is equal to frequency change when 70 mass of filter paper using mass change amount, calculates mass transfer system
Number k.The quality of filter paper 70 should be set in controller 200.
When the micronic dust measuring device based on microbalance is chronically at operating status, mass transfer coefficient k can occur micro-
Small variation.So-called calibration (calibration) is exactly to refer to that this mass transfer coefficient k is acquired periodically, and be applied to micronic dust
The measurement of concentration.
In the following, being illustrated to the control principle of controller 200.
Controller 200 drives filter holder mounting plate 50 to revolve by controlling according to the scheduled period stepper motor 120
Turn, to be installed on free end 11 behind the top for the free end 11 for making counterweight be moved to vibrating tube 10 with filter holder 60a.Utilize vibration
Dynamic frequency measuring device 20 vibrates vibrating tube 10, measures eigentone with this, and complete to calibrate.
Although at this point, can only utilize the measurement of concetration filter holder 60 for not collecting micronic dust is mobile and install to free end 11
The eigentone measured afterwards just can be carried out calibration, however, it is possible to according to the eigentone that measures when replacement filter paper into
Row calibration.For convenience's sake, eigentone is measured to by installation counterweight filter holder 60a, and is calibrated with this
Mode be illustrated.
After completing calibration, controller 200 will be at least two measurement of concetration filter holders 60 for not collecting micronic dust filter paper
It is successively moved to the free end 11 of vibrating tube 10 and is mounted on free end 11, to be inhaled while replacing filter paper by curved tube 40
Enter sample air, collect micronic dust, the mass change amount of micronic dust is collected in measurement.
In conjunction with Fig. 7 to Fig. 9, filter paper replacement, micronic dust are collected and the measurement of micronic dust mass change is illustrated.
Fig. 7 is longitudinal sectional view when replacing filter paper.
Fig. 8 is longitudinal sectional view when collecting micronic dust by filter paper.
Fig. 9 is longitudinal sectional view when measurement is collected in the mass change amount of filter paper.
As shown in fig. 7, the step of replacement filter paper is, by controlling servomotor 140, land vertical shift block 150, makes
The free end 11 of vibrating tube 10 is in the state for being detached from the casing 61 of measurement of concetration filter holder 60；Later, by controlling stepping
Motor 120 drives filter holder mounting plate 50 to rotate, and the measurement of concetration filter holder 60 with quasi- replacement filter paper 70 is made to be located at vibration
The top of the free end 11 of pipe 10.
Then, increase vibrating tube 10 by promoting vertical shift block 150, as measurement of concetration filter is injected in free end 11
The casing 61 of folder 60, measurement of concetration filter holder 60 lift from filter holder mounting plate 50 and are installed on free end 11.
When filter paper replacing options as described above are also applied for counterweight being installed on free end 11 with filter holder 60a.
As shown in figure 8, the step of collecting micronic dust is that measurement of concetration filter holder 60 is mounted on to the state of free end 11
Under, by promoting vertical shift block 150, keep vibrating tube 10 further up, with the filter paper for being located at measurement of concetration filter holder 60
The lower end of 70 sealed sample pipes 30 sucks air by curved tube 40, passes through the sample air sucked by sample cell 30 later
It after filter paper 70 filters, is discharged by casing 61, vibrating tube 10 and curved tube 40, to achieve the effect that collect micronic dust by filter paper.
Replaced using the above method when collecting micronic dust after filter paper, by preset time interval to the mass change amount of micronic dust into
Row measurement.
As shown in figure 9, the step of measuring the mass change amount for collecting micronic dust is, stopping passing through 40 air-breathing of curved tube
In the state of, by declining vertical shift block 150, filter holder 60 is made to land and being in end and the filter holder installation of sample cell 30
Between plate 50.Later, eigentone is measured using vibration frequency measuring device 20.Complete eigentone
After measurement, vertical shift block 150 is promoted, rises with it filter holder 60, hence into micronic dust collection status, to carry out micronic dust receipts
Collection, as shown in Figure 8.
The eigentone measured by preset time interval is substituted into formula 1 by controller, is calculated based on intrinsic vibration
The variation tendency and collection cumulant of the micronic dust collecting amount of dynamic frequency variation, and the sample air flow sucked according to curved tube 40,
Calculate the micronic dust concentration in air.
If collecting micronic dust while collecting the mass change amount of micronic dust by preset time interval measurement, it will lead to receipts
The quantity for collecting micronic dust increases, to reduce the capacity gauge of filter paper, therefore, it is necessary to replace filter paper.
Then, when micronic dust, which collects cumulant, is greater than preset quantity or eigentone less than default value, lead to
It crosses controller 200 to be controlled, to replace filter paper.At this point, since eigentone can collect the increasing of cumulant with micronic dust
Add and gradually decrease, therefore, vibration frequency when micronic dust capacity gauge is immediately lower than optimum level is obtained after testing repeatedly,
And the vibration frequency of acquisition is set as the preset value or is set as collecting corresponding micronic dust the predetermined amount of cumulant.
When replacing filter paper, vertical shift block 150 declines, and drives vibrating tube 10 to decline therewith, so that free end 11 be made to be detached from
The casing 61 of measurement of concetration filter holder 60, and measurement of concetration filter holder 60 is made to be installed on filter holder mounting plate 50, at this moment, from
Measurement of concetration filter holder 60 and filter holder mounting plate 50 are disengaged by end 11.Thereafter the step of and the step phase in conjunction with described in Fig. 8
Together.
Counterweight filter holder 60a is replaced with measurement of concetration filter holder 60 and is surveyed with counterweight filter holder 60a replacement concentration
When amount filter holder 60, identical method when using with replacement filter paper.
It measures vibration frequency in addition, counterweight is installed under 10 free end 11 of vibrating tube with filter holder 60a and calibrates
When, as shown in figure 8, rising vibrating tube 10 by promoting vertical shift block 150, so that counterweight filter holder 60a be made to be in sample
Between the lower end and filter holder mounting plate 50 of quality control 30, in this case, measured inherently using vibration frequency measuring device 20
Vibration frequency.After measuring eigentone, pass through the decline of vertical shift block 150, vibrating tube 10 of landing, so that counterweight be made to use
Filter holder 60a is installed on filter holder mounting plate 50.Later, filter holder mounting plate 50 is rotated, measurement of concetration filter holder 60 is pacified
Free end 11 loaded on vibrating tube 10, to carry out micronic dust collection and measurement.
As described above, having will pacify with the measurement of concetration filter holder 60 for not collecting micronic dust filter paper when being calibrated
Therefore the eigentone number measured when mounted in the free end 11 of vibrating tube 10 is measured by installation counterweight filter holder 60a
After eigentone, intrinsic vibration is measured when installation is with the initial concentration measurement filter holder 60 for not collecting micronic dust filter paper
Frequency.For this purpose, calculate mass transfer coefficient k using the formula 2, later, during collecting micronic dust, by it is preset when
Between interval measurement mass change amount when, mass change amount is measured using the calibration value k of mass transfer coefficient.
In addition, be connected to curved tube 40 aspiration pump and suck sample air flow regulator (or sample air inhale
Enter measuring device) it is that when sucking sample air and carrying out measurement of concetration therefore necessary known assemblies are not labeled in attached drawing
In.
In addition, the formation of supporting block 110 has the position of the sample cell socket 112 for being inserted into sample cell 30, equipped with being used for
Heat the heater of sample cell 30.The moisture that the moisture in sample air is formed on filter paper 70 can be evaporated using heater,
More accurately to measure the quality of micronic dust.
In addition, being blended in the maximum particle diameter of the micronic dust in sucking sample air using the limitation of partial size separator, and use
The micronic dust concentration of any one in measurement PM10, PM2.5 and PM1.
Furthermore, it is possible at least two measurement of concetrations use in filter holder 60 specify one as calibration special filter paper press from both sides.This
When, calibration steps includes: to measure eigentone in the state of being equipped with the counterweight filter holder 60a, be equipped with
It measures eigentone in the state of the specified calibration special filter paper folder and mass is calculated according to the formula 2 and become
Change coefficient k.
Above-mentioned explanation is only the detailed description to the embodiment of the present invention, but the scope of the present invention be not limited to it is above-mentioned
Embodiment.Claims and specification and its it is shown in the drawings within the scope of by it is some modification, it can be achieved that different
Embodiment, and this modification should belong to the scope of the present invention.
Claims (10)
1. a kind of micronic dust measuring device based on microbalance, the end of sample cell and oneself for being installed on hollow cone shape vibrating tube
It is set relatively by the filter holder held, the sample air flowed by sample cell is after the filter paper of filter holder obtains filtering, by certainly
It is emitted into the boring of vibrating tube by end, after the vibration that vibrating tube is caused by controller, measures the change of eigentone
Change value measures the micronic dust quality collected by filter paper with this, it is characterised in that: it includes: to be equipped with filter paper and for receiving
Collect micronic dust, measure the measurement of concetration filter holder of quality and for obtaining coefficient of relationship between the quality of micronic dust and vibration frequency ---
The filter holder mounting plate of the counterweight filter holder of mass transfer coefficient；And filter holder mounting plate is moved under the control of the controller,
It is installed in the state of free end after counterweight is moved to free end with filter holder, by measuring eigentone calibrating quality
Transformation coefficient, and free end is installed on after measurement of concetration is moved to free end with filter holder, and measure the stepping electricity of micronic dust quality
Machine.
2. the micronic dust measuring device according to claim 1 based on microbalance, it is characterised in that: the counterweight filter paper
Be not provided with filter paper in folder, the controller utilize the eigentone measured when counterweight is mounted on free end with filter holder,
The quality of the eigentone and filter paper that measure when measurement of concetration is mounted on free end with filter holder obtains mass transfer system
Number.
3. the micronic dust measuring device according to claim 2 based on microbalance, it is characterised in that: the filter holder installation
Plate is equipped at least two measurement of concetration filter holders, and the controller is dense by least two by control stepper motor
It spends measurement and is sequentially arranged at free end with filter holder, to replace the filter paper for micronic dust mass measurement, and collect micronic dust and survey
Measure quality.
4. a kind of micronic dust measuring device based on microbalance, the end of sample cell and oneself for being installed on hollow cone shape vibrating tube
It is set relatively by the filter holder held, the sample air flowed by sample cell is after the filter paper of filter holder obtains filtering, by certainly
It is emitted into the boring of vibrating tube by end, after the vibration that vibrating tube is caused by controller, measures the change of eigentone
Change value measures the micronic dust quality collected by filter paper with this, it is characterised in that: it includes: to be equipped at least two with filter paper
And the filter holder mounting plate for collecting micronic dust, the measurement of concetration filter holder for measuring quality；And the control in the controller
At least two measurement of concetrations, are sequentially arranged at the free end of vibrating tube by lower mobile filter holder mounting plate with filter holder, and replacement is used
In the stepper motor of the filter paper of measurement micronic dust quality, it is installed at least two measurement of concetration filter paper of the filter holder mounting plate
At least one of folder is for obtaining coefficient of relationship between micronic dust quality and vibration frequency --- the counterweight of mass transfer coefficient is used
Filter holder, the controller are installed on the shape of free end after counterweight is moved to free end with filter holder by control stepper motor
Under state, eigentone is measured, with calibrating quality transformation coefficient, later, filter paper is replaced, measures the quality of micronic dust.
5. the micronic dust measuring device according to claim 3 or 4 based on microbalance, it is characterised in that: the controller
Counterweight is mounted on free end with filter holder according to the preset period, with calibrating quality transformation coefficient.
6. the micronic dust measuring device according to claim 3 or 4 based on microbalance, it is characterised in that: when the matter of micronic dust
When amount is less than preset value more than preset quantity or eigentone, controlled by the controller, to replace filter paper.
7. the micronic dust measuring device according to any one of claim 1 to 4 based on microbalance, it is characterised in that: institute
It states vibrating tube to be fixed under the action of servomotor on vertical shift block moving up and down, the bottom surface of filter holder, which is equipped with, to be passed through
The hollow bushing for being common to the upper surface of installation filter paper center and extending downwardly, the free end of vibrating tube are inserted in casing, make filter paper
Folder is installed on free end, and casing is injected by control servomotor and stepper motor in free end by the controller, makes to certainly
It is lifted from filter holder mounting plate by the mobile filter holder in end top, later, measurement micronic dust is collected or quality, freely by decline
End, extracts it from casing out, after filter holder is mounted on filter holder mounting plate, passes through mobile filter holder mounting plate, replacement filter
Paper.
8. the micronic dust measuring device according to claim 7 based on microbalance, it is characterised in that: the controller passes through
Control servomotor promotes free end, lifts filter holder, and after closely covering sample tube end with filter paper, is collected by filter paper
Sample air when filter holder is between sample tube end and filter holder mounting plate, is measured micro- by measurement eigentone
The quality of dirt.
9. the micronic dust measuring device according to claim 8 based on microbalance, it is characterised in that: equipped with encasing sample cell
The sealing ring of end compresses close when through filter paper filtered sample air, collection micronic dust at the edge of filter holder edge or filter paper
Seal, to be sealed.
10. the micronic dust measuring device according to claim 7 based on microbalance, it is characterised in that: the filter holder peace
Loading board is in disk form, above be equipped with along same radius circumferencial direction at least two longitudinal openings of radial distribution, be used for
The mounting hole for installing filter holder, is rotated under the action of stepper motor, so that at least two filter holders be made successively to be moved to
The free end of vibrating tube.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020140177479A KR101646685B1 (en) | 2014-12-10 | 2014-12-10 | Measuring apparatus of suspended particulates based on microbalance |
| KR10-2014-0177479 | 2014-12-10 | ||
| PCT/KR2015/005414 WO2016093447A1 (en) | 2014-12-10 | 2015-05-29 | Microbalance-based fine dust measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106716106A CN106716106A (en) | 2017-05-24 |
| CN106716106B true CN106716106B (en) | 2019-07-12 |
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| CN201580051274.6A Active CN106716106B (en) | 2014-12-10 | 2015-05-29 | Micronic dust measuring device based on microbalance |
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| Country | Link |
|---|---|
| KR (1) | KR101646685B1 (en) |
| CN (1) | CN106716106B (en) |
| WO (1) | WO2016093447A1 (en) |
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| KR101820101B1 (en) | 2016-06-30 | 2018-01-18 | 서강대학교산학협력단 | Measuring apparatus and micro-tube manufacturing method in the same |
| KR101723073B1 (en) | 2016-09-01 | 2017-04-05 | (주)오션네트웍스 | Ine dust concentration measuring apparatus and fine dust concentration measuring system |
| CN108844869B (en) * | 2018-06-06 | 2024-04-12 | 山西省生态环境监测和应急保障中心(山西省生态环境科学研究院) | Online smoke dust sampling and weighing device and method |
| KR102157126B1 (en) * | 2019-10-09 | 2020-09-18 | (주) 에이스엔 | Dual sample loop type ambient air monitoring system and method using sensor and gas chromatography |
| CN115901523B (en) * | 2022-12-29 | 2024-02-23 | 江苏环保产业技术研究院股份公司 | Industrial park air quality detection device and detection method |
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Also Published As
| Publication number | Publication date |
|---|---|
| KR20160070474A (en) | 2016-06-20 |
| WO2016093447A1 (en) | 2016-06-16 |
| CN106716106A (en) | 2017-05-24 |
| KR101646685B1 (en) | 2016-08-08 |
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