CN106716106A - Microbalance-based fine dust measuring device - Google Patents
Microbalance-based fine dust measuring device Download PDFInfo
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- CN106716106A CN106716106A CN201580051274.6A CN201580051274A CN106716106A CN 106716106 A CN106716106 A CN 106716106A CN 201580051274 A CN201580051274 A CN 201580051274A CN 106716106 A CN106716106 A CN 106716106A
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- Prior art keywords
- filter holder
- micronic dust
- filter
- filter paper
- free end
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- 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
-
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S436/00—Chemistry: analytical and immunological testing
- Y10S436/908—Gravimetric analysis
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Analytical Chemistry (AREA)
- General Health & Medical Sciences (AREA)
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Abstract
The present invention relates to a microbalance-based fine dust measuring device which continuously measures fine dust concentration by automatically replacing filter papers, or performs automatic calibration using a balance weight for calibration, wherein a plurality of concentration measurement filter paper holders, on which filter papers are seated, and a balance weight filter paper holder are seated on a holder mount plate, and wherein the holder mount plate is rotated, thereby replacing the filter paper holders and being mounted on the free end of a vibration tube, the balance weight filter paper holder being for obtaining a mass conversion coefficient, which is the correlation coefficient between the mass of fine dust and the vibration frequency.
Description
Technical field
The present invention relates to a kind of automatic replacing filter paper, can continuously detect micronic dust concentration or carry out school automatically using calibrating weight
The accurate micronic dust measurement apparatus based on microbalance.
Background technology
Suspension in air is distributed in the polydispersion that particle diameter is generally 0.1 μm to 100 μm, and contains various chemistry
Component.Particularly micronic dust, can directly or indirectly influence health, endanger animals and plants, reduce visibility, so as to turn into air
The hot research object of chemical field.Relevant micronic dust project is included into atmospheric environment benchmark project, in order to improve atmospheric environment and
Carrying out coherent detection and management.
At the research initial stage, researcher is directed generally to TSP（total suspended particulate）Management project, but with
The enhancing of health care consciousness, starts to research and develop relevant micronic dust, i.e. PM10（Below particle diameter 10um）Management project, and in recent years, due to
PM2.5（Below particle diameter 2.5um）It is more serious to the harm caused by human body, therefore, while PM2.5 is incorporated into management item
Mesh.At present, PM1 problems of management just progressively attract attention.
In order to manage micronic dust PM10, PM2.5, PM10, PM1, it is necessary to use micronic dust measurement apparatus.
At present, representative micronic dust measuring 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 directly survey
The method for measuring weight.
Fig. 1 is the existing micronic dust measurement apparatus structural representation based on microbalance.
Common microbalance method（TEOM）, such as institute in US granted patent 4391338 and Japanese granted patent the 3354217th
State, be typically with the cone-shaped vibrating tube 10 that axial diameter gradually increases from the bottom to top, the lower end of this vibrating tube 10 is use
In fixed fixing end 12, upper end is free end 11.The free end 11 of vibrating tube 10 is provided with the filter holder 60 with filter paper 70,
By sample air that sample cell 30 enters after filter paper 70 is filtered, it is emitted into by the free end 11 of vibrating tube 10 and is shaken
It is hollow inside dynamic pipe 10.Generally, the boring of vibrating tube 10 is connected with the curved tube 40 for being connected to aspiration pump, from
And can flow sample air.
As sample air is through filter paper 70, the micronic dust that filter paper 70 is collected can increase, with the increase quality meeting of micronic dust collecting amount
Increase, cause the eigentone formed by the resonance of vibrating tube 10 to be gradually reduced.Using eigentone and matter
Relation between amount, monitors micronic dust mass change amount, so that measurable micronic dust collects trend, collects micronic dust in cumulant and air
Concentration.
Additionally, according to the structure and material characteristic of vibrating tube 10, filter holder 60, filter paper 70 etc., between eigentone and quality
The coefficient value of relation changes, therefore, after the filter holder that will be used as counterweight is arranged on the free end of vibrating tube, by surveying
Measure eigentone to obtain coefficient, and calibrated.
But, the filter holder for being calibrated or being measured micronic dust collecting amount need to be arranged on the free end 11 of vibrating tube 10, and
Existing micronic dust measurement apparatus can only carry out manually installed.Then, calibration error is larger, at present, is arranged in South Korea's form is assert
Except PM2.5 automatic measuring instruments.Additionally, when the micronic dust being deposited on filter paper reaches certain amount, measuring the program meeting of micronic dust
It is automatically stopped, therefore, in actual use, user will manually change filter paper at regular intervals, so as to be not easy to
Continuously and automatically measure, and the reliability of detection data may be difficult to ensure that because depositing excessive micronic dust on a filter paper
Property.
（Prior art literature）
（Patent document）
（Patent document 1）US4391338A 1983.07.05
（Patent document 2）JP3354217 B2 2002.09.27.
The content of the invention
It is an object of the invention to overcome above-mentioned deficiency, there is provided a kind of to carry out school with filter holder by automatic counterweight of installing
Standard, in due course between automatic change filter paper, the micronic dust measurement apparatus based on microbalance of continuous measurement micronic dust concentration.
To achieve these goals, this invention takes following technical scheme.
The present invention is based on the end of the sample cell of the micronic dust measurement apparatus of microbalance and is installed on hollow cone shape vibrating tube
The filter holder of free end is put relatively, after the sample air that sample cell is flowed into is filtered through the filter paper of filter holder, passes through
Free end is emitted into the boring of vibrating tube, by after the vibration that controller causes vibrating tube, measuring eigentone
Changing value, the micronic dust quality collected by filter paper is measured with this, and the micronic dust measurement apparatus based on microbalance include：It is provided with
There is filter paper and for collecting micronic dust, the measurement of concetration filter holder of measurement quality and quality and vibration frequency for obtaining micronic dust
Between coefficient of relationship --- the filter holder installing plate of the counterweight filter holder of mass transfer coefficient；And move under the control of the controller
Filter holder installing plate, is installed in the state of free end after counterweight filter holder is moved into free end, is inherently shaken by measurement
Dynamic frequency calibrating quality conversion coefficient, and free end is installed on after measurement of concetration filter holder is moved into free end, and measure micro-
The stepper motor of dirt quality.
Filter paper is not provided with the counterweight filter holder, the controller is utilized to be surveyed when counterweight is arranged on into free end with filter holder
Eigentone, when measurement of concetration filter holder is arranged on into free end the eigentone that measures and filter paper matter
Amount obtains mass transfer coefficient.
The filter holder installing plate is provided with measurement of concetration filter holder described at least two, and the controller is by controlling stepping
At least two measurement of concetration filter holders are sequentially arranged at free end by motor, are used to change the filter for micronic dust mass measurement
Paper, and collect micronic dust and measurement quality.
The present invention is based on the end of the sample cell of the micronic dust measurement apparatus of microbalance and is installed on hollow cone shape vibrating tube
The filter holder of free end is put relatively, after the sample air that sample cell is flowed into is filtered through the filter paper of filter holder, passes through
Free end is emitted into the boring of vibrating tube, by after the vibration that controller causes vibrating tube, measuring eigentone
Changing value, the micronic dust quality collected by filter paper is measured with this, and the micronic dust measurement apparatus based on microbalance include：Be provided with to
The few two filter holder installing plates with filter paper and for collecting micronic dust, the measurement of concetration filter holder of measurement quality；And institute
Mobile filter holder installing plate under the control of controller is stated, at least two measurement of concetration filter holders are sequentially arranged at vibrating tube
Free end, changes the stepper motor of the filter paper for measuring micronic dust quality.
It is micro- for obtaining to be installed at least one of at least two measurement of concetration filter holders of the filter holder installing plate
The counterweight filter holder of coefficient of relationship between dirt quality and vibration frequency --- mass transfer coefficient, the controller is walked by controlling
Stepper motor is installed in the state of free end after counterweight filter holder is moved into free end, eigentone is measured, with school
Quasi- mass transfer coefficient, afterwards, changes filter paper, measures the quality of micronic dust.
Counterweight is arranged on free end by the controller according to the default cycle with filter holder, with calibrating quality conversion coefficient.
When the quality of micronic dust exceedes predetermined number or eigentone is less than preset value, controlled by the controller
System, to change filter paper.
The vibrating tube is fixed in the presence of servomotor on vertical shift block moving up and down, the bottom surface of filter holder
Insertion is provided with for installing center and the hollow bushing for extending downwardly above filter paper, the free end of vibrating tube is inserted in sleeve pipe,
Filter holder is set to be installed on free end, sleeve pipe is injected in free end by the controller by controlling servomotor and stepper motor,
The filter holder moved to free end top is set to be lifted from filter holder installing plate, afterwards, measurement micronic dust is collected or quality, under
Drop free end, makes it be extracted out from sleeve pipe, after filter holder is arranged on into filter holder installing plate, by mobile filter holder installing plate,
Change filter paper.
The controller is by controlling servomotor to lift free end, filter holder being lifted, and with filter paper close over sample cell
Behind end, sample air is collected by filter paper, filter holder is in when between sample tube end and filter holder installing plate, by measurement
Eigentone measures the quality of micronic dust.
The sealing ring for encasing sample tube end is provided with, when by filter paper filtered sample air, collection micronic dust, at filter holder edge
Or the edge of filter paper compresses sealing ring, to be sealed.
The filter holder installing plate is in disk form, is provided with above along the circumferencial direction of same radius with least the two of radial distribution
Individual longitudinal opening, the mounting hole for installing filter holder, are rotated in the presence of stepper motor, so that at least two filters
Folder is moved to the free end of vibrating tube successively.
At least two filter holders are arranged on filter holder installing plate by micronic dust measurement apparatus of the present invention based on microbalance, for more
The filter holder installed in vibrating tube free end is changed, therefore, the measurement of concetration filter holder with filter paper is not changed manually, and can
Continuously measured by moving and installing measurement of concetration successively with filter holder；Whenever calibration is needed, by mobile and peace
Dress counterweight is calibrated automatically with filter holder, so as to micronic dust concentration can be accurately measured.
Brief description of the drawings
Fig. 1 is the structural representation of the existing micronic dust measurement apparatus based on microbalance.
Fig. 2 is the structural representation of micronic dust measurement apparatus of the present invention based on microbalance.
Fig. 3 is the longitudinal sectional view of micronic dust measurement apparatus of the present invention based on microbalance.
Fig. 4 is the transverse sectional view of micronic dust measurement apparatus of the present invention based on microbalance.
Fig. 5 is the partial exploded view of micronic dust measurement apparatus of the present invention based on microbalance.
Fig. 6 is schematic diagram when filter holder and filter paper in Fig. 5 on filter holder installing plate is separated.
Longitudinal sectional view when Fig. 7 is micronic dust measurement apparatus replacing filter paper of the present invention based on microbalance.
Fig. 8 is the longitudinal sectional view when present invention is based on the micronic dust measurement apparatus of microbalance by filter paper collection micronic dust.
When Fig. 9 is the micronic dust quality change situation that micronic dust measurement apparatus measurement of the present invention based on microbalance is collected on filter paper
Longitudinal sectional view.
In accompanying drawing：
10：Vibrating tube； 11：Free end； 12：Fixing end； 13：It is 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 installing plate；51：Mounting hole；
60：Measurement of concetration filter holder； 60a：Counterweight filter holder； 61：Sleeve pipe； 62：Filter paper mounting groove； 70：Filter paper； 100：
Support； 110：Support block； 111：Installing plate socket；112：Sample cell socket； 113：Vibrating tube socket；114：Vibrating member is inserted
Mouthful；115：Vibrating sensor socket； 116：Sealing ring 120：Stepper motor； 130：Guiding block； 140：Servomotor；
150：Vertical shift block；151：Internal channel； 200：Controller；210：Cable.
Specific embodiment
The preferred embodiments of the present invention are illustrated below in conjunction with the accompanying drawings, so as to one skilled in the art's reality
Apply.
Fig. 2 to Fig. 6 is the accompanying drawing for illustrating micronic dust measurement apparatus of the present invention based on microbalance.Fig. 2 is structural representation,
Fig. 3 is longitudinal sectional view, and Fig. 4 is transverse sectional view, and Fig. 5 is partial exploded view, and Fig. 6 is in Fig. 5 on filter holder installing plate
Filter holder and filter paper separate when schematic diagram.
As shown in Figures 2 to 6, micronic dust measurement apparatus of the present invention based on microbalance, are provided with for installing on its support 100
The vibrating tube 10 of filter holder 60, the vibration frequency measuring device 20 of the eigentone for measuring vibrating tube 10, for supplying
Answer sample air sample cell 30, for discharge filtering sample air curved tube 40 and be provided with least two filter holders 60,
60a filter holders installing plate 50, can automatically carry out filter paper replacing, micronic dust collection, micronic dust mass change in the presence of controller 200
Measurement and calibration.
The support 100 includes support block 110, guiding block 130, vertical shift block 150.
The vertical shift block 150 is vertically and fixedly provided with the cone that the diameter fixed by fixing end 12 is tapered into from the bottom to top above
Shape hollow tubular vibrating tube 10, and be provided with and can make interior hollow the 13 of vibrating tube 10 internal channel 151 being connected with curved tube 40.It is described
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, is controlled due to being provided with controlled device 200
Servomotor 140, therefore, can by servomotor 140 drive vertical shift block 150 move up and down.
Vibration frequency measuring device 20, sample cell 30, filter holder installing plate 50 and for driving are installed in the support block 110
Filter holder installing plate 50 is moved（The embodiment of the present invention is rotation）Stepper motor 120.The support block 110 is located at and moves up and down
The top of block 150, the end of the end of sample cell 30, i.e. discharge sample air is in the free end 11 of vertical direction and vibrating tube 10
Relatively, by movement（Rotate）Filter holder installing plate 50, at least two filter holders 60 for making to be installed on filter holder installing plate 50,
60a is sequentially located between the free end 11 of vibrating tube 10 and the end of sample cell 30.
Specifically, the support block 110 is provided with vibrating tube socket 113, sample cell socket 112, vibrating member socket 114 and shakes
Dynamic sensor socket 115 and installing plate socket 111.The vibrating tube socket 113 is used to insert vibrating tube 10 from the bottom to top,
And it is outer with vibrating tube 10 it is intermarginal leave space, to be easily inserted vibrating tube 10, and make vibrating tube 10 be free to carry out
Lower movement and vibration；The sample cell socket 112 is arranged at the vertical direction top of vibrating tube socket 113, with vibrating tube socket
Space is left between 113 upper end, from it during portion's insertion sample cell 30, the lower end of sample cell 30 and the free end of vibrating tube 10
100 is relative and be spaced relationship to；The vibrating member socket 114 and vibrating sensor socket 115 are with the height less than space
The both sides of width are arranged at, are connected with vibrating tube socket 113 respectively；The installing plate socket 111 is used for from above inserting
Enter filter holder installing plate 50, at least one filter holder 60 for being installed on filter holder installing plate 50 is configured at sample cell socket 112
Lower end and the upper end of vibrating tube socket 113 between space in, and it leaves gap in-between, makes filter holder installing plate 50
Can easily move（Rotation）, by movement（Rotation）Filter holder installing plate 50, will be installed on filter holder installing plate 50
At least two filter holders 60,60a are configured at the space between the lower end of sample cell socket 112 and the upper end of vibrating tube socket 113 successively
It is interior.
In the embodiment of the present invention, the filter paper mounting groove 62 for plugging filter paper 70 is provided with above the filter holder 60,60a, its
Hollow tubular sleeve pipe 61 is arranged below.The bottom centre of filter paper mounting groove 62 is run through, and the boring with sleeve pipe 61 is connected.
Described sleeve pipe 61 is used to insert the free end 11 of vibrating tube 10, when vibrating tube 10 is glass tube, is easily subject to during insertion
It is damaged.Therefore, the lower inner edge of described sleeve pipe 61 is provided with for encasing the outer peripheral pad 11a in free end 11.The pad
11a is also securable to free end 11, and it also has the effect that free end 11 can be made more stably to be plugged in sleeve pipe 61.
The filter holder installing plate 50 is provided with longitudinal opening, in disk form, and it is provided with least two from centrally along identical half above
With the mounting hole 51 of radial distribution, the mounting hole 51 carries and is used for blocking filter holder 60,60a bottom surfaces side the circumferencial direction in footpath
The rib of edge.When filter holder 60,60a is arranged in respective mounting hole 51 one by one, the sleeve pipe 61 of each filter holder is inserted in peace
Expose in dress 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 axis, will
Filter holder installing plate 50 as described above is placed in the horizontal plane, and is installed in support block 110, it is ensured that have an installation
Hole 51 is located in the space between vibrating tube socket 113 and sample cell socket 112.Whenever filter holder installing plate 50 is in stepper motor
When the angle rotated under 120 drive is equal to the angle for forming adjacent mounting hole 51 under the control of the controller 200, position
Space between vibrating tube socket 113 and sample cell socket 112, i.e. under the free end 11 of vibrating tube 10 and sample cell 30
Mounting hole 51 between end is converted successively.In other words, with radial at least two filter holders for being arranged on filter holder installing plate 50
60th, 60a is moved between the free end 11 of vibrating tube 10 and the lower end of sample cell 30 in turn successively.
For inserting a part for the filter holder installing plate 50 and can omit the upper-lower height of its installing plate socket 111 for rotating
More than the thickness of filter holder installing plate 50.
At least two filter holders 60,60a for being installed on filter holder installing plate 50 are divided into and are provided with filter paper 70, can carry out micronic dust collection
And measurement of concetration at least two measurement of concetration filter holders 60 and for obtaining the relation system between micronic dust quality and vibration frequency
Number --- at least one counterweight filter holder 60a of mass transfer coefficient.
In the embodiment of the present invention, counterweight filter holder 60a is not provided with filter paper 70, therefore, filtered with the measurement of concetration for being provided with filter paper
Folder 60 is compared, and its quality is smaller, and the difference of both quality is the quality of filter holder 60.It is of poor quality using this, by controller
200 obtain mass transfer coefficient.
Additionally, filter holder installing plate 50 and sample cell 30 are arranged on into support block 110, vertical shift block 150 uprightly will be fixed on
The top of vibrating tube 10 above is inserted in vibrating tube socket 113, makes the top freedom of the bottom of sample cell 30 and vibrating tube 10
Vertically vertical direction is relative and put at end 11, is provided with space therebetween as the rotation of filter holder installing plate 50 is changed successively
Filter holder 60,60a.
Configured in the bottom of sample cell 30 and the upper free ends of vibrating tube 10 with the state for being installed on filter holder installing plate 50
Filter holder 60,60a between 11 in space, with moving up and down for vertical shift block 150, the free end 11 of vibrating tube 10 is inserted
Enter in the sleeve pipe 61 of filter holder 60,60a, and be raised from filter holder installing plate 50, so that it is not contacting sample cell 30
Degree is in suspended state.When filter holder 60,60a is the measurement of concetration filter holder 60 for being provided with filter paper 70, can increase
Lifting heights, make filter paper 70 be close to the end of sample cell 30 and cover.By lower general who has surrendered's filter holder 60,60a of vibrating tube 10
In the mounting hole 51 of filter holder installing plate 50, and 10 free end of vibrating tube 11 is set to depart from sleeve pipe 61.Now, filter paper is rotated
Folder installing plate 50 can 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 provided with and encases
The sealing ring 116 of the end of sample cell 30.In the state of the end of sample cell 30 is covered with filter paper 70, sealing ring 116 can be close to
In the edge of filter holder 60 or the edge of filter paper 70, filter paper 70 is passed through from sample cell 30 with this sealed sample air, is passed through again
The sleeve pipe 61 of filter holder 60 to the boring of vibrating tube 10 passage.
In embodiments of the invention, vibration frequency measuring device 20 to vibrating tube 10 top apply vibration vibrating member 21,
The top of vibrating tube 10 is arranged at corresponding to vibrating member 21 to the position of its applying vibration, the vibration for receiving the applying of vibrating member 21
Vibration hammer 22, and for detecting that the vibrating sensor 23 of the eigentone of vibrating tube 10 is constituted.Here, the He of vibrating member 21
Vibrating sensor 23 is made up of such as the piezoelectric element employed in Japanese granted patent the 3354217th, to vibrating sensor 23
After the vibration of the frequency of sensing is amplified, vibrating tube 10 is put on using vibrating member 21, form the intrinsic vibration based on resonance
Frequency, eigentone is detected with this.
The vibrating member 21 and vibrating sensor 23 of the vibration frequency measuring device 20 pass through vibrating member socket 114 and vibrating sensing
Support block 110 is run through in the both sides in the width direction of device socket 115, and is inserted in vibrating tube socket 113 across its end
Vibrating tube 10 is put relatively.And position that put relative with the vibrating member 21 and vibrating sensor 23 is corresponding in vibrating tube 10
Position be fixed with vibration hammer 22 so that by vibration frequency measuring device 20 detect eigentone.
Controller 200 is by cable 210 with electric signal mode and vibrating member 21, vibrating sensor 23, stepper motor 120 and servo
Motor 140 is connected, and is used to control the actions such as calibration, micronic dust collection, the measurement of micronic dust mass change and filter paper replacing.Therefore,
Controller 200 is by the microcomputer that can be controlled to the component connected by cable 201 according to the configuration processor of each action
Constitute.
Measurement of concetration filter holder 60 is set with controller 200 and counterweight filter holder 60a is installed on filter holder installing plate 50
On positional information.Wherein, the installation site information of measurement of concetration filter holder 60 is set according to order, therefore, enter
During row calibration, after being moved to counterweight filter holder 60a the free end 11 of vibrating tube 10 and be installed on free end 11, carry out described
Calibration；After being moved to measurement of concetration filter holder 60 free end 11 of vibrating tube 10 successively and be installed on free end 11, carry out
The micronic dust is collected and the measurement of micronic dust mass change, then carries out filter paper replacing.
First, the micronic dust based on microbalance measures the quality and conical part intrinsic vibration that applied principle is conical part
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 mathematics
Formula is calculated.
Formula 1
In formula, △ m represent the micronic dust mass change amount being collected into；f0Represent what the mass change amount of △ m was measured before producing
Vibration frequency；F represents the vibration frequency that the mass change amount of △ m is measured after producing；K is mass transfer coefficient, for representing
Relation between quality m and the inverse of vibration frequency square.
Mass transfer coefficient k can be respectively mounted the different filter paper of quality by the free end 11 of conical part vibrating tube 10
Press from both sides to measure vibration frequency, and will calculate and obtain in its result substitution above-mentioned formula 1.
At least two measurement of concetration filter holders with filter paper 70 are installed on the filter holder installing plate 50 of the embodiment of the present invention
60 and at least one without filter paper 70 counterweight filter holder 60a.Can be by will be installed with filter holder 60a without the counterweight of filter paper
In behind the free end 11 of vibrating tube 10 measure vibration frequency and by collect micronic dust before or be not used for measure concentration measurement of concetration
Vibration frequency is measured after the free end 11 of vibrating tube 10 is installed on filter holder 60, and mass is calculated using following equation 2 and become
Change coefficient k.Here, calculating the collection mass change amount of micronic dust using counted mass transfer coefficient k.
Formula 2
In formula 2, M represents the quality of filter paper 70；f1Represent and be installed on certainly the measurement of concetration filter holder 60 with filter paper 70
The vibration frequency measured during by end 11, f2Representing will survey when being installed on free end 11 without the counterweight filter holder 60a of filter paper 70
The vibration frequency for obtaining.Frequency change during 70 mass of filter paper is equal to using mass change amount, mass transfer coefficient k is calculated.
The quality of filter paper 70 should be set in controller 200.
When the micronic dust measurement apparatus based on microbalance are chronically at running status, mass transfer coefficient k can occur small change
Change.So-called calibration（calibration）Exactly refer to and this mass transfer coefficient k is acquired periodically, and be applied to micronic dust concentration
Measurement.
Below, the control principle to controller 200 is illustrated.
Controller 200 is controlled by according to the predetermined cycle to stepper motor 120, drives filter holder installing plate 50 to rotate,
So that counterweight filter holder 60a is installed on free end 11 after being moved to the top of the free end 11 of vibrating tube 10.Using vibration
Frequency measuring equipment 20 vibrates vibrating tube 10, measures eigentone with this, and complete calibration.
Now, although surveyed after the measurement of concetration filter holder 60 that will not collect micronic dust can only be utilized to move and free end 11 is attached to
The eigentone for obtaining can just be calibrated, however, it is possible to carry out school according to the eigentone measured when changing filter paper
It is accurate.For convenience's sake, to measuring eigentone, and the side calibrated with this by installing counterweight filter holder 60a
Formula is illustrated.
After completing calibration, controller 200 will carry at least two measurement of concetration filter holders 60 for not collecting micronic dust filter paper successively
It is moved to the free end 11 of vibrating tube 10 and is arranged on free end 11, so as to sucks sample by curved tube 40 while filter paper is changed
Product air, collects micronic dust, and the mass change amount of micronic dust is collected in measurement.
With reference to Fig. 7 to Fig. 9, filter paper replacing, micronic dust are collected and the measurement of micronic dust mass change is illustrated.
Fig. 7 is longitudinal sectional view when changing filter paper.
Fig. 8 is longitudinal sectional view when micronic dust is collected by filter paper.
Fig. 9 is to measure longitudinal sectional view when being collected in the mass change amount of filter paper.
As shown in fig. 7, the step of changing filter paper is, by controlling servomotor 140, land vertical shift block 150, makes vibration
The free end 11 of pipe 10 is in the state for departing from the measurement of concetration sleeve pipe 61 of filter holder 60；Afterwards, by controlling stepper motor
120 drive filter holder installing plates 50 rotate, and make to be located at vibrating tube 10 with filter holder 60 with the measurement of concetration for intending changing filter paper 70
Free end 11 top.
Then, vibrating tube 10 is made to increase by lifting vertical shift block 150, as measurement of concetration filter holder is injected in free end 11
60 sleeve pipe 61, measurement of concetration filter holder 60 is lifted from filter holder installing plate 50 and is installed on free end 11.
When filter paper replacing options as described above are also applied for for counterweight filter holder 60a being installed on free end 11.
As shown in figure 8, the step of collecting micronic dust is, measurement of concetration is arranged in the state of free end 11 with filter holder 60, led to
Lifting vertical shift block 150 is crossed, makes vibrating tube 10 further up, sealed with the filter paper 70 for being located at measurement of concetration filter holder 60
The bottom of sample cell 30, afterwards, air is sucked by curved tube 40, makes the sample air sucked by sample cell 30 through filter paper 70
After filtering, discharged by sleeve pipe 61, vibrating tube 10 and curved tube 40, collect the effect of micronic dust by filter paper so as to reach.
During using collecting micronic dust after above method replacing filter paper, the mass change amount of micronic dust is surveyed by default time interval
Amount.
As shown in figure 9, the mass change amount to collecting micronic dust is the step of measuring, stopping by the shape of the air-breathing of curved tube 40
Under state, by declining vertical shift block 150, filter holder 60 is set to land and the end in sample cell 30 and filter holder installing plate 50
Between.Afterwards, eigentone is measured using vibration frequency measuring device 20.Complete eigentone measurement
Afterwards, vertical shift block 150 is lifted, filter holder 60 is increased therewith, hence into micronic dust collection status, to carry out micronic dust collection,
As shown in Figure 8.
The eigentone that controller will be measured by default time interval substitutes into formula 1, calculates based on intrinsic vibration frequently
The variation tendency and collection cumulant of the micronic dust collecting amount of rate change, and the sample air flow sucked according to curved tube 40, calculate
The micronic dust concentration gone out in air.
If collecting micronic dust while the mass change amount of micronic dust is collected by default time interval measurement, can cause to collect micro-
The quantity of dirt increases, so that the capacity gauge of filter paper is reduced, accordingly, it would be desirable to change filter paper.
Then, when micronic dust collects cumulant is less than default value more than default quantity or eigentone, by control
Device processed 200 is controlled, to change filter paper.Now, because eigentone can be with the increase of micronic dust collection cumulant
Gradually decrease, therefore, obtained after testing repeatedly micronic dust capacity gauge immediately lower than optimum level when vibration frequency, and will
The vibration frequency of acquisition is set as the preset value or is set as collecting correspondence micronic dust the predetermined amount of cumulant.
When changing filter paper, vertical shift block 150 declines, and drives vibrating tube 10 to decline therewith, so that free end 11 departs from concentration
The sleeve pipe 61 of filter holder 60 is used in measurement, and measurement of concetration filter holder 60 is installed on filter holder installing plate 50, at this moment, free end
11 disengage measurement of concetration filter holder 60 and filter holder installing plate 50.Thereafter the step of, is identical with the step described in combination Fig. 8.
Replaced counterweight filter holder 60a and replaced measurement of concetration with counterweight filter holder 60a with measurement of concetration filter holder 60 and used
During filter holder 60, identical method during using with replacing filter paper.
Additionally, when counterweight being installed on into the measurement vibration frequency of 10 free end of vibrating tube 11 times with filter holder 60a and being calibrated, such as
Shown in Fig. 8, vibrating tube 10 is set to increase by lifting vertical shift block 150, so that counterweight is in sample cell 30 with filter holder 60a
Bottom and filter holder installing plate 50 between, in this case, using vibration frequency measuring device 20 measurement intrinsic vibration frequently
Rate.After measurement eigentone, by the decline of vertical shift block 150, vibrating tube 10 of landing, so that counterweight filter holder
60a is installed on filter holder installing plate 50.Afterwards, rotation filter holder installing plate 50, is installed on measurement of concetration filter holder 60 and shakes
The free end 11 of dynamic pipe 10, to carry out micronic dust collection and measurement.
As described above, when being calibrated, possessing will be arranged on the measurement of concetration filter holder 60 for not collecting micronic dust filter paper
The eigentone number measured during the free end 11 of vibrating tube 10, therefore, measure intrinsic by installing counterweight filter holder 60a
After vibration frequency, intrinsic vibration is measured frequently when installing with the initial concentration measurement filter holder 60 for not collecting micronic dust filter paper
Rate.Therefore, mass transfer coefficient k is calculated using the formula 2, afterwards, during micronic dust is collected, by the default time
During interval measurement mass change amount, the calibration value k of use quality conversion coefficient measures mass change amount.
In addition, being connected to the aspiration pump of curved tube 40 and the flow regulator of suction sample air（Or sample air soakage
Measurement apparatus）It is to suck sample air and carry out necessary known assemblies during measurement of concetration, therefore, do not mark in the accompanying drawings.
Additionally, the formation of support block 110 has the position for inserting the sample cell socket 112 of sample cell 30, it is provided with for heating
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, with more
Plus accurately measure the quality of micronic dust.
Additionally, being blended in the maximum particle diameter of the micronic dust in suction sample air using the limitation of particle diameter separator, and it is used to survey
The micronic dust concentration of any one in amount PM10, PM2.5 and PM1.
Furthermore, it is possible to be pressed from both sides as calibration special filter paper with specified one in filter holder 60 at least two measurement of concetrations.Now, school
Quasi- step includes：Eigentone is measured in the state of the counterweight filter holder 60a is installed, the finger is being installed
Eigentone is measured in the state of fixed calibration special filter paper folder and mass transfer coefficient is calculated according to the formula 2
k。
Above-mentioned explanation is only the detailed description to the embodiment of the present invention, but the scope of the present invention is not limited to above-mentioned implementation
Mode.Claims and specification and its it is shown in the drawings within the scope of changed by some, be capable of achieving different implementations
Mode, and this modification should belong to the scope of the present invention.
Claims (11)
1. a kind of micronic dust measurement apparatus based on microbalance, the end of sample cell be installed on hollow cone shape vibrating tube from
Put relatively by the filter holder held, after the sample air that sample cell is flowed into is filtered through the filter paper of filter holder, by certainly
The boring of vibrating tube is emitted into by end, by after the vibration that controller causes vibrating tube, measuring the change of eigentone
Change value, the micronic dust quality collected by filter paper is measured with this, it is characterised in that：It includes：It is provided with filter paper and for receiving
Collect micronic dust, the measurement of concetration filter holder of measurement quality and for obtaining coefficient of relationship between the quality of micronic dust and vibration frequency ---
The filter holder installing plate of the counterweight filter holder of mass transfer coefficient；And move filter holder installing plate under the control of the controller,
It is installed in the state of free end after counterweight filter holder is moved into free end, by measuring eigentone calibrating quality
Conversion coefficient, and measurement of concetration filter holder is moved to be installed on behind free end free end, and measure the stepping electricity of micronic dust quality
Machine.
2. micronic dust measurement apparatus based on microbalance according to claim 1, it is characterised in that：The counterweight filter paper
Be not provided with filter paper in folder, the controller using the eigentone measured when counterweight filter holder is arranged on into free end,
The eigentone and the quality of filter paper measured when measurement of concetration filter holder is arranged on into free end obtain mass transfer system
Number.
3. micronic dust measurement apparatus based on microbalance according to claim 2, it is characterised in that：The filter holder is installed
Plate is provided with measurement of concetration filter holder described at least two, and the controller is dense by least two by controlling stepper motor
Degree measurement filter holder is sequentially arranged at free end, is used to change the filter paper for micronic dust mass measurement, and collect micronic dust and survey
Amount quality.
4. a kind of micronic dust measurement apparatus based on microbalance, the end of sample cell be installed on hollow cone shape vibrating tube from
Put relatively by the filter holder held, after the sample air that sample cell is flowed into is filtered through the filter paper of filter holder, by certainly
The boring of vibrating tube is emitted into by end, by after the vibration that controller causes vibrating tube, measuring the change of eigentone
Change value, the micronic dust quality collected by filter paper is measured with this, it is characterised in that：It includes：At least two are provided with filter paper
And for collecting the filter holder installing plate of micronic dust, the measurement of concetration filter holder of measurement quality；And in the control of the controller
Lower mobile filter holder installing plate, at least two measurement of concetration filter holders are sequentially arranged at the free end of vibrating tube, are changed and are used
In the stepper motor of the filter paper of measurement micronic dust quality.
5. micronic dust measurement apparatus based on microbalance according to claim 4, it is characterised in that：It is installed on the filter paper
It is for obtaining between micronic dust quality and vibration frequency to press from both sides at least one of at least two measurement of concetration filter holders of installing plate
The counterweight filter holder of coefficient of relationship --- mass transfer coefficient, the controller is by controlling stepper motor by counterweight filter paper
Folder is installed in the state of free end after being moved to free end, measures eigentone, with calibrating quality conversion coefficient, it
Afterwards, filter paper is changed, the quality of micronic dust is measured.
6. micronic dust measurement apparatus based on microbalance according to claim 3 or 5, it is characterised in that：The controller
Counterweight is arranged on free end with filter holder according to the default cycle, with calibrating quality conversion coefficient.
7. micronic dust measurement apparatus based on microbalance according to any one of claim 3 to 5, it is characterised in that：When
When the quality of micronic dust exceedes predetermined number or eigentone less than preset value, it is controlled by the controller, with
Change filter paper.
8. micronic dust measurement apparatus based on microbalance according to any one of claim 1 to 5, it is characterised in that：Institute
State vibrating tube to be fixed in the presence of servomotor on vertical shift block moving up and down, the bottom surface of filter holder is provided with to be passed through
It is common to and center and the hollow bushing for extending downwardly above filter paper is installed, the free end of vibrating tube is inserted in sleeve pipe, makes filter paper
Folder is installed on free end, and sleeve pipe is injected in free end by the controller by controlling servomotor and stepper motor, makes to certainly
Lifted from filter holder installing plate by the filter holder for holding top to move, afterwards, measurement micronic dust is collected or quality, by declining freely
End, makes it be extracted out from sleeve pipe, after filter holder is arranged on into filter holder installing plate, by mobile filter holder installing plate, changes filter
Paper.
9. micronic dust measurement apparatus based on microbalance according to claim 8, it is characterised in that：The controller passes through
Control servomotor lifting free end, lift filter holder, and with filter paper close over sample tube end after, by filter paper collection
Sample air, filter holder is in when between sample tube end and filter holder installing plate, measures micro- by measuring eigentone
The quality of dirt.
10. micronic dust measurement apparatus based on microbalance according to claim 9, it is characterised in that：It is provided with and encases sample
The sealing ring of tube end, when by filter paper filtered sample air, collection micronic dust, compresses at the edge of filter holder edge or filter paper
Sealing ring, to be sealed.
The 11. micronic dust measurement apparatus based on microbalance according to claim 8, it is characterised in that：The filter holder peace
Dress plate is in disk form, is provided with above along the circumferencial direction of same radius with least two longitudinal openings of radial distribution, is used for
The mounting hole of filter holder is installed, is rotated in the presence of stepper motor, so that at least two filter holders are moved to successively
The free end of vibrating tube.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2014-0177479 | 2014-12-10 | ||
| KR1020140177479A KR101646685B1 (en) | 2014-12-10 | 2014-12-10 | Measuring apparatus of suspended particulates based on microbalance |
| PCT/KR2015/005414 WO2016093447A1 (en) | 2014-12-10 | 2015-05-29 | Microbalance-based fine dust measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106716106A true CN106716106A (en) | 2017-05-24 |
| CN106716106B CN106716106B (en) | 2019-07-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201580051274.6A Active CN106716106B (en) | 2014-12-10 | 2015-05-29 | Micronic dust measuring device based on microbalance |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR101646685B1 (en) |
| CN (1) | CN106716106B (en) |
| WO (1) | WO2016093447A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108844869A (en) * | 2018-06-06 | 2018-11-20 | 山西省环境科学研究院 | A kind of flue dust on-line sampling and weighing device and method |
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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 |
| CN110333161B (en) * | 2019-07-03 | 2024-05-17 | 杭州品享科技有限公司 | Household paper powder falling rate detection device |
| 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 |
| CN115078196A (en) * | 2022-04-29 | 2022-09-20 | 淮南矿业集团兴科计量技术服务有限责任公司 | Calibrating device for dust concentration measuring instrument |
| 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 |
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| WO2016093447A1 (en) | 2016-06-16 |
| CN106716106B (en) | 2019-07-12 |
| KR20160070474A (en) | 2016-06-20 |
| KR101646685B1 (en) | 2016-08-08 |
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