CN103604733A - Dust environment simulator and calibration method for dust concentration measuring instrument by using same - Google Patents
Dust environment simulator and calibration method for dust concentration measuring instrument by using same Download PDFInfo
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- CN103604733A CN103604733A CN201310633801.7A CN201310633801A CN103604733A CN 103604733 A CN103604733 A CN 103604733A CN 201310633801 A CN201310633801 A CN 201310633801A CN 103604733 A CN103604733 A CN 103604733A
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Abstract
The invention discloses a dust environment simulator and a calibration method for a dust concentration measuring instrument by using the same. The dust environment simulator comprises a dust generation unit, a simulation chamber and a test support, wherein the simulation chamber comprises a cylindrical mixing section, a concentrating section with a convergent lower end, a diffusing section with a flared lower end and a cylindrical test section, the sections are communicated from top to bottom, the bottom of the test section is provided with an air outlet, a dust outlet of the dust generation unit is communicated with the mixing section, the test support is installed in the test section, at least two disposition stations are arranged in a same horizontal plane on the test support, the test section is provided with an openable and closable observation door, and an air inlet is communicated with a air feeding fan or the air outlet is connected with an air exhausting fan. The dust environment simulator utilizes the vertically arranged simulation chamber for mixing, concentration and diffusion of dust and air-flow, enables dust to be uniformly distributed in the test section in the manner of free falling, allows difference of concentration of dust located at a same horizontal position in the test section to be reduced and is capable of increasing the calibration accuracy of a dust concentration tester.
Description
Technical field
The present invention relates to a kind of dust atmosphere analogue means, for simulating dust environment, the present invention relates to a kind of method of utilizing this dust atmosphere analogue means to demarcate dust concentration tester simultaneously.
Background technology
Environmental simulation technology is a new marginal technology, mainly studies the imageneering technology of various physical environments and the experimental technique of product under simulated environment; Ground environment analog machine mainly contains following a few class: low temperature environment simulation, hot environment simulation, hygrothermal environment simulation, solar irradiation simulation, sand dust environmental simulation, rain environmental simulation, dipping simulation, sour environment simulation, the simulation of explosive atmospheric environment, the environmental simulation of accumulated ice/sleet and mould environmental simulation etc.Once can be in interior environment reliability test, accuracy correction or the long duration test etc. of carrying out product after some environment simulations out.What the device of so simulating for dust atmosphere generally adopted is the horizontal wind-tunnel of level, utilize negative pressure to make wind-tunnel produce Air Flow, and wind-tunnel connects a dust generation device, dust enters into after producing in wind-tunnel and forms dust simulated environment, and this dust simulated environment can be demarcated dust concentration tester.Said structure has following defect:
1. above-mentioned dust simulated environment is only adapted to the dust atmosphere simulation that concentration is larger, and is not suitable for the dust simulation, particularly dust concentration requirement 0.01～20mg/m of low concentration
3: it is even at wind-tunnel that its reason wants micro-dust, wind speed just can not be fast, and the too slow dust of wind speed can slowly be deposited on due to the gravity of self Lower Half of wind-tunnel, cause the concentration in the same cross section of wind-tunnel inconsistent, will affect like this accuracy of the demarcation of dust concentration tester.
2. in above-mentioned dust simulated environment, the homogeneity of dust concentration is difficult to ensure card very much; Because the flow direction of air in wind-tunnel is horizontal direction, the horizontal force that dust in wind-tunnel applies it at the air of the horizontal flow of receiving so and the gravity of vertical direction, dust is received so makes a concerted effort dust is very likely deposited to wind-tunnel lower portion in the situation that speed air flow is slower;
3. the dust generation device in above-mentioned dust simulated environment is the dust that utilizes tape transport discrete, then utilizes hairbrush that dust is kicked up and is blown in wind-tunnel, and the dust that this dust generation device is only applicable to high concentration produces.
Summary of the invention
Technical matters to be solved by this invention is: a kind of dust atmosphere analogue means is provided, the simulation chamber that this dust atmosphere analogue means utilization vertically arranges mixes dust, concentrate, spread with air-flow, dust is evenly distributed in the test section of simulation chamber in the mode of free-falling, make in test section concentration deviation on same level position reduce, and then can improve the accuracy that dust concentration tester is demarcated.
Another technical matters to be solved by this invention is in addition: provide a kind of and utilize above-mentioned dust atmosphere analogue means to demarcate the method for dust concentration tester, the method can improve the accuracy of dust concentration tester calibration result greatly.
For solving the problems of the technologies described above, technical scheme of the present invention is: a kind of dust atmosphere analogue means, comprise dust generation device, simulation chamber and test bearing, described simulation chamber from top to bottom comprises the mixing section of column casing shape, enriching section, the diffuser of lower end enlarging, the test section of column casing shape closing up in lower end; Described mixing section, enriching section, diffuser, test section are vertically communicated with in turn, on described mixing section, are provided with air inlet, and the bottom of described test section is provided with air outlet; The dust mouth of described dust generation device is communicated with mixing section; Described test bearing is installed in test section, is positioned in same level and is provided with at least two placement stations on this test bearing, is provided with observation door to be opened/closed on this test section, and described air inlet is communicated with air feed blower fan or air outlet connects the blower fan of bleeding.
As a kind of preferred scheme, described dust generation device comprises base, dispersing chamber, powder piece conveying device, dust diverting device, described dispersing chamber is arranged on base, and this dispersing chamber is provided with air inlet and dust mouth, and the bottom of dispersing chamber is provided with powder block entrance; Described powder piece conveying device comprises the vertical barrel that is installed on dispersing chamber bottom, and the inner chamber of this barrel is communicated with dispersing chamber by powder block entrance, in described barrel, is provided with piston, and this piston drives with the piston driver being fixed on base; Described dust diverting device comprises that disperseing brush and dispersion brush drive unit, this dispersion brush to horizontally rotate is installed in dispersing chamber, and this dispersion brush drive unit is fixed on base and drives the uniform rotation of dispersion brush.
As a kind of preferred scheme, described piston driver comprises drive motor, speed reduction unit, screw-nut body, the leading screw of described screw-nut body vertically rotates and is installed on base, vertically align with piston in the upper end of this leading screw, the nut rotation of this screw-nut body is installed on base, drive motor and speed reduction unit are installed on base, output shaft and the reducer input shaft of drive motor are in transmission connection, reducer output shaft and nut are in transmission connection, on described base, be installed on vertical spacing guide rod, on described leading screw, be installed with positioning disk, on this positioning disk, be provided with the limiting section rotating with vertical spacing guide rod engagement limits leading screw.
As a kind of preferred scheme, described vertical spacing guide rod is detachably installed on base, on described base, be provided with the He Xia hole, upper hole of being convenient to vertical spacing guide rod plug-in mounting, described vertical spacing guide rod vertically runs through He Xia hole, hole, the bottom of described vertical spacing guide rod is provided with ladder axial region, and this ladder axial region is plugged in lower hole.
As a kind of preferred scheme, described test bearing vertically rotation is installed in test section, and this test bearing is connected with rotary power unit.
As a kind of preferred scheme, the air intake direction of described air inlet and the inwall of mixing section are tangent.
Adopted after technique scheme, effect of the present invention is: because this simulation chamber is vertical setting, thereby the speed of Air Flow can control very littlely, dust still can rely on the mode of free setting to fall, as long as so just guarantee that dust is uniformly dispersed; And simulation chamber has mixing section, enriching section and diffuser, dust enters into enriching section in mixing chamber with after the air-flow premixed entering, smaller volume when the lower end closing in of enriching section makes dust and air through enriching section end opening, concentration improves, and homogeneity also improves; And then volume increases after diffuser, dust disperses, thereby further improve homogeneity, like this, enter in the same level of test section dust concentration just basically identical, concentration deviation is smaller, like this, by dust concentration tester to be calibrated, when filter membrane method standard sample instrument or dust sampling reference measure instrument are placed in same level, dust concentration tester to be calibrated, filter membrane method standard sample instrument or the residing actual concentrations of dust sampling reference measure instrument are consistent, as long as compare and measure the detection accuracy that value can relatively be demarcated dust concentration tester.This dust atmosphere analogue means is very suitable for the dust atmosphere simulation of low concentration.
Because described dust generation device comprises base, dispersing chamber, powder piece conveying device, dust diverting device, described dispersing chamber is arranged on base again, and this dispersing chamber is provided with air inlet and dust mouth, and the bottom of dispersing chamber is provided with powder block entrance, described powder piece conveying device comprises the vertical barrel that is installed on dispersing chamber bottom, and the inner chamber of this barrel is communicated with dispersing chamber by powder block entrance, in described barrel, is provided with piston, and this piston drives with the piston driver being fixed on base, described dust diverting device comprises and disperses brush and disperse brush drive unit, this dispersion is brushed to horizontally rotate and is installed in dispersing chamber, this dispersion brush drive unit is fixed on base and drives and disperses brush uniform rotation, therefore, in this dust generation device, adopt powder piece conveying device to carry, disperse brush and powder piece end contact to brush out dust, compare current loose powder lot feeding, produce concentration stable and uniform more, air-flow in dispersing chamber can not produce any impact to powder piece, thereby realized, need how many dust, accurately brush is how many to disperse brush, and can be applicable to producing micro-dust, make to produce Dust Capacity more accurate, this dust generation device disperses that the stabilization of speed of brush is controlled, moving up of piston carried controlledly, make so powder piece and the unit interval of disperseing brush interiorly contact consistency of thickness, thereby the output Dust Capacity in the unit interval can accurately be controlled.
Again because described vertical spacing guide rod is detachably installed on base, on described base, be provided with the He Xia hole, upper hole of being convenient to vertical spacing guide rod plug-in mounting, described vertical spacing guide rod vertically runs through He Xia hole, hole, the bottom of described vertical spacing guide rod is provided with ladder axial region, this ladder axial region is plugged in lower hole, therefore, the speed moving up due to leading screw is very low, therefore the rotating speed that drive motor rotates by speed reduction unit drive nut is very little, after powder piece in barrel is finished so, need leading screw to retreat downwards, even if now drive motor energetic start up is to maximum, the reset of leading screw also may need several hours even for more time, now, drive motor can be stopped, vertical spacing guide rod is extracted out separated with positioning disk, like this, leading screw rotates freely whereabouts under the drive of himself gravity and positioning disk gravity, thereby can complete fast reset, save time.
Again because described test bearing vertically rotates and is installed in test section, this test bearing is connected with rotary power unit, like this, dust concentration tester to be calibrated, filter membrane method standard sample instrument or dust sampling reference measure instrument can rotate with test bearing in same level, thereby further improve the accuracy of measuring.Certainly, speed is low as far as possible rotatably for this, in order to avoid produce turbulent flow.
A method of utilizing the simulating dust environment demarcation dust concentration tester of above-mentioned dust atmosphere analogue means, it comprises the following steps:
A. by dust concentration tester to be calibrated, filter membrane method standard sample instrument or dust sampling reference measure instrument are placed on respectively on two placement stations in same level;
B. be continuously simulation chamber one from top to bottom mobile air-flow is provided, the flow velocity of this air-flow be (0-0.2m/s];
C. dust generation device is evenly input to dust in the mixing section of simulating chamber and mixes with air-flow;
D. be mixed with dust air from top to bottom concentrated through the enriching section of simulation chamber successively, after the diffusion of diffuser, be dispersed in test section, then from air outlet, discharge;
E. every the T time period, record the detection numerical value of dust concentration tester to be calibrated and dust sampling reference measure instrument numerical value once, this T > 2h;
F. by formula
calculate the error of indication of detector to be calibrated;
In formula: δ-error of indication, %;
ρ
1the detection display mean value of-dust concentration tester to be calibrated, unit: mg/m
3;
ρ
0-dust sampling reference measure instrument is measured mean value or the filter membrane method standard sample instrument calculating gained of weighing, unit: mg/m
3.
If in specialized range, dust concentration tester to be calibrated is not defective for δ, if dust concentration tester to be calibrated is qualified in specialized range again for δ.The method is simple to operate, and result is accurate.
In addition, in this step C, the even input of dust generation device realizes in the following manner:
C1. in the precompressed of 100-200 object dried dust, shorten particle diameter into powder piece;
C2. powder piece is put in dust generation device;
C3. uniform rotation is brushed in the dispersion in dispersing chamber, and in dispersing chamber, passes into the pressurized air of constant flow rate;
C4. powder piece is at the uniform velocity promoted to contact generation dust with disperseing brush.
The mode that the even input mode utilization of this dust disperses brush to contact with powder piece scrapes input dust by the dust of powder piece end face, and the dust that is applicable to very much low concentration produces.
Equally, described dust concentration tester to be calibrated, filter membrane method standard sample instrument or dust sampling reference measure instrument rotate in same level by testing bearing drive, speed of rotation be (0-1] R/M, utilize the mode of rotation to measure, can reduce so the error that the dust concentration difference in same level is brought, make dust concentration tester to be calibrated, the test dust concentration environment of living in of filter membrane method standard sample instrument or dust sampling reference measure instrument is consistent.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the structural representation of the embodiment of the present invention;
Fig. 2 is the vertical view of the test bearing of the embodiment of the present invention;
Fig. 3 is the structural representation of the dust generation device of the embodiment of the present invention;
In accompanying drawing: 1. simulate chamber 1; 11. mixing sections 1; 12. enriching sections 12; 13. diffusers 13; 14. test sections 14; 2. dust generation device 2; 201. bases 201; 202. dispersing chambers 202; 203. disperse brush 203; 204. barrels 204; 205. pistons 205; 206. powder pieces 206; 207. disperse brush motor 207; 208. drive motor 208; 209. speed reduction units 209; 210. active synchronization wheels 210; 211. driven synchronizing wheels 211; 212. leading screws 212; 213. nuts 213; 214. positioning disks 214; 215. vertical spacing guide rods 215; 3. dust concentration tester to be calibrated; 4. dust sampling reference measure instrument 4; 5. observe door 5; 6. test bearing 6; 7. electric control gear 7.
Embodiment
Below by specific embodiment, the present invention is described in further detail.
As shown in Figure 1, 2, 3, a kind of dust atmosphere analogue means, comprise dust generation device 2, simulation chamber 1 and test bearing 6, described simulation chamber 1 from top to bottom comprises the mixing section 1 of column casing shape, enriching section 12, the diffuser 13 of lower end enlarging, the test section 14 of column casing shape closing up in lower end; Described mixing section 1, enriching section 12, diffuser 13, test section 14 are vertically communicated with in turn, and close up in enriching section 12 lower ends, thereby relative aperture lower end, upper end bore is large, makes like this cubic deformation, and dust is concentrated, changes the horizontal distribution situation of dust; On described mixing section 1, be provided with air inlet, the air intake direction of described air inlet and the inwall of mixing section 1 are tangent.The bottom of described test section 14 is provided with air outlet; Described air inlet is communicated with air feed blower fan or air outlet connects the blower fan of bleeding.This exhausting blower fan or air feed blower fan are all for simulation chamber 1 provides air-flow, and in order to guarantee the accuracy of inner concentration, at air inlet place, screen pack can be set.
The dust mouth of described dust generation device 2 is communicated with mixing section 1; This dust mouth to go out dirt direction relative with the air intake direction of air inlet, can make mix dust more even like this.Described test bearing 6 is installed in test section 14, on this test bearing 6, be positioned at and in same level, be provided with at least two and place stations, place on station for these two and be placed with respectively dust concentration tester 3 to be calibrated and dust sampling reference measure instrument 4, wherein testing bearing 6 can be fixing with test section 14, can also make the structure of vertical rotation, test bearing 6 vertically rotation is installed in test section 14, this test bearing 6 is connected with rotary power unit, the rotational speed of rotary support is very little, to avoid turbulent flow.On this test section 14, be provided with observation door 5 to be opened/closed, this observation door 5 can be opened and place dust concentration tester 3 to be calibrated, also observable inner case.
This analogue means is also provided with electric control gear 7, and it comprises controls blower fan and the control section of dust generation device 2 actions and the display screen that shows dust concentration tester 3 to be calibrated, dust sampling reference measure instrument 4 numerical value;
Described dust generation device 2, comprise base 201, dispersing chamber 202, powder piece 206 conveying devices, dust diverting device, this base 201 comprises lower bottom base 201 and the superposed upper bed-plate 201 that is positioned at bottom, described dispersing chamber 202 is arranged on base 201, specifically be fixed on upper bed-plate 201, this dispersing chamber 202 is provided with air inlet and ，Gai dust mouth, dust mouth is preferably horizontality, and the bottom of dispersing chamber 202 is provided with powder piece 206 entrances; Described powder piece 206 conveying devices comprise the vertical barrel 204 that is installed on dispersing chamber 202 bottoms, the inner chamber of this barrel 204 is communicated with dispersing chamber 202 by powder piece 206 entrances, in described barrel 204, be provided with piston 205, this piston 205 drives with piston 205 drive units that are fixed on base 201; During use, the powder piece 206 of pre-pressing is tucked in the inner chamber of barrel 204, wherein, barrel 204 is cylindric, thereby this powder piece 206 is also cylindric and adaptive with inner chamber size; Described powder piece 206 is that dry coal dust, talcum powder or other the suitable powder dust particle precompression after filtering with 200 order sieves forms.
Described dust diverting device comprises that disperseing brush 203 and dispersion brush 203 drive units, this dispersion brush 203 to horizontally rotate is installed in dispersing chamber 202, and these dispersion brush 203 drive units are fixed on base 201 and drive 203 uniform rotation of dispersion brush.These dispersion brush 203 drive units are a dispersion brush motor 207, and this dispersion brush motor 207 is horizontally disposed with and is connected with disperseing the central shaft driven of brush 203.
Described piston 205 drive units comprise drive motor 208, speed reduction unit 209, screw-nut body, the leading screw 212 of described screw-nut body vertically rotates and is installed on base 201, vertically align with piston 205 in the upper end of this leading screw 212, the upper end of leading screw 212 can pushing tow piston 205, the nut 213 of this screw-nut body rotates and is installed on base 201, drive motor 208 and speed reduction unit 209 are installed on base 201, specifically install on lower bottom base 201, the output shaft of drive motor 208 and speed reduction unit 209 input shafts are in transmission connection, speed reduction unit 209 output shafts and nut 213 are in transmission connection, its concrete kind of drive is: on described speed reduction unit 209 output shafts, be provided with active synchronization wheel 210, on base 201, be rotatablely equipped with driven synchronizing wheel 211, described nut 213 is fixed on driven synchronizing wheel 211 with one heart, between described active synchronization wheel 210 and driven synchronizing wheel 211, be provided with Timing Belt.Driven synchronizing wheel 211 rotates and is installed on base 201 and is enclosed within on leading screw 212, and the lower surface of driven synchronizing wheel 211 and nut 213 are fixing.This nut 213 is a swivel nut, and this swivel nut is threaded with leading screw 212 and rotates and is installed on base 201, and the upper-lower position of swivel nut is retrained by base 201.
On described base 201, be installed on vertical spacing guide rod 215, on described leading screw 212, be installed with positioning disk 214, on this positioning disk 214, be provided with the limiting section rotating with vertical spacing guide rod 215 engagement limits leading screws 212.Described limiting section is the stopper slot of open loop, the number of this stopper slot be a plurality of and circumference uniform distribution on positioning disk 214, described vertical spacing guide rod 215 is in one of them stopper slot.Like this, when drive motor 208 drives nut 213 rotation, the positioning disk 214 on leading screw 212 is by vertical spacing guide rod 215 restrictions, thereby leading screw 212 cannot, with nut 213 rotations, can only vertically move.This stopper slot also available spacing hole substitutes.
Wherein, described vertical spacing guide rod 215 is detachably installed on base 201, on described base 201, be provided with the He Xia hole, upper hole of being convenient to vertical spacing guide rod 215 plug-in mountings, on this, hole and lower Kong Jun are arranged on lower bottom base 201, and vertically aim at, described vertical spacing guide rod 215 vertically runs through He Xia hole, hole, and the bottom of described vertical spacing guide rod 215 is provided with ladder axial region, and this ladder axial region is plugged in lower hole.
In addition, the invention also discloses a kind of method of utilizing the simulating dust environment demarcation dust concentration tester of above-mentioned dust atmosphere analogue means, it comprises the following steps:
A. by dust concentration tester 3 to be calibrated, filter membrane method standard sample instrument or dust sampling reference measure instrument 4 are placed on respectively on two placement stations in same level; This dust concentration tester 3 to be calibrated is connected with electric control gear 7, and display screen can real-time display device test concentrations; The utilization of above-mentioned filter membrane method standard sample instrument drops into dust on filter membrane and puts into after weighing on high-precision weighing instrument and can be calculated concentration value.
B. be continuously simulation chamber 1 a from top to bottom mobile air-flow is provided, the flow velocity of this air-flow be (0-0.2m/s], wherein, provide the mode of air-flow can adopt malleation to supply gas or the mode of negative inspiratory pressure, the air entering in simulation chamber 1 need be pure air, to guarantee that measurement of concetration is accurate;
C. dust generation device 2 is evenly input to dust in the mixing section 1 of simulating chamber 1 and mixes with air-flow;
D. be mixed with dust air from top to bottom concentrated through the enriching section 12 of simulation chamber 1 successively, after the diffusion of diffuser 13, be dispersed in test section 14, then from air outlet, discharge, because flow velocity is very low, therefore, dust is full of whole test section 14 in the mode of proximate freedom sedimentation, and dust concentration is even;
E. every the T time period, record the detection numerical value of dust concentration tester 3 to be calibrated and dust sampling reference measure instrument 4 numerical value once, this T > 2h; Recording number of times can determine as required; And these record in number of times, can test from choosing several concentration point in the sensing range of dust concentration tester 3 to be calibrated, thereby determine that this dust concentration tester undetermined measures the accuracy of numerical value further accurately.
F. by formula
calculate the error of indication of detector to be calibrated;
In formula: δ-error of indication, %;
ρ
1the detection display mean value of-dust concentration tester 3 to be calibrated, unit: mg/m
3;
ρ
0-dust sampling reference measure instrument 4 is measured mean values or the filter membrane method standard sample instrument calculating gained of weighing, unit: mg/m
3.
If in specialized range, dust concentration tester 3 to be calibrated is not defective for δ, if dust concentration tester 3 to be calibrated is qualified in specialized range again for δ.The method is simple to operate, and result is accurate.
In addition, in this step C, the even input of dust generation device 2 realizes in the following manner:
This dust generation device 2 utilizes the dispersion brush 203 of uniform rotation and the dry powder piece 206 of feed at the uniform velocity
C1. in the precompressed of 100-200 object dried dust, shorten particle diameter into powder piece 206;
C2. powder piece 206 is put in dust generation device 2;
C3. 203 uniform rotation are brushed in the dispersion in dispersing chamber 202, and in dispersing chamber 202, pass into the pressurized air of constant flow rate;
C4. powder piece 206 is at the uniform velocity promoted to contact generation dust with disperseing brush 203.
The even input mode utilization of this dust disperses brush 203 modes that contact with powder piece 206 that the dust of powder piece 206 end faces is scraped to input, and the dust that is applicable to very much low concentration produces.
Equally, described dust concentration tester to be calibrated 3, filter membrane method standard sample instrument or dust sampling reference measure instrument 4 are preferably driven and are rotated in same level by test bearing 6, speed of rotation be (0-1] R/M, utilize the mode of rotation to measure, can reduce the error that the dust concentration difference in same level is brought, make the test dust concentration environment of living in of dust concentration tester 3 to be calibrated and dust sampling reference measure instrument 4 consistent.
Claims (9)
1. a dust atmosphere analogue means, comprise dust generation device, simulation chamber and test bearing, it is characterized in that: described simulation chamber from top to bottom comprises the mixing section of column casing shape, enriching section, the diffuser of lower end enlarging, the test section of column casing shape closing up in lower end; Described mixing section, enriching section, diffuser, test section are vertically communicated with in turn, on described mixing section, are provided with air inlet, and the bottom of described test section is provided with air outlet; The dust mouth of described dust generation device is communicated with mixing section; Described test bearing is installed in test section, is positioned in same level and is provided with at least two placement stations on this test bearing, is provided with observation door to be opened/closed on this test section, and described air inlet is communicated with air feed blower fan or air outlet connects the blower fan of bleeding.
2. a kind of dust atmosphere analogue means as claimed in claim 1, it is characterized in that: described dust generation device comprises base, dispersing chamber, powder piece conveying device, dust diverting device, described dispersing chamber is arranged on base, this dispersing chamber is provided with air inlet and dust mouth, and the bottom of dispersing chamber is provided with powder block entrance; Described powder piece conveying device comprises the vertical barrel that is installed on dispersing chamber bottom, and the inner chamber of this barrel is communicated with dispersing chamber by powder block entrance, in described barrel, is provided with piston, and this piston drives with the piston driver being fixed on base; Described dust diverting device comprises that disperseing brush and dispersion brush drive unit, this dispersion brush to horizontally rotate is installed in dispersing chamber, and this dispersion brush drive unit is fixed on base and drives the uniform rotation of dispersion brush.
3. a kind of dust atmosphere analogue means as claimed in claim 2, it is characterized in that: described piston driver comprises drive motor, speed reduction unit, screw-nut body, the leading screw of described screw-nut body vertically rotates and is installed on base, vertically align with piston in the upper end of this leading screw, the nut rotation of this screw-nut body is installed on base, drive motor and speed reduction unit are installed on base, output shaft and the reducer input shaft of drive motor are in transmission connection, reducer output shaft and nut are in transmission connection, on described base, be installed on vertical spacing guide rod, on described leading screw, be installed with positioning disk, on this positioning disk, be provided with the limiting section rotating with vertical spacing guide rod engagement limits leading screw.
4. a kind of dust atmosphere analogue means as claimed in claim 3, it is characterized in that: described vertical spacing guide rod is detachably installed on base, on described base, be provided with the He Xia hole, upper hole of being convenient to vertical spacing guide rod plug-in mounting, described vertical spacing guide rod vertically runs through He Xia hole, hole, the bottom of described vertical spacing guide rod is provided with ladder axial region, and this ladder axial region is plugged in lower hole.
5. a kind of dust atmosphere analogue means as described in claim 1 to 4 any one, is characterized in that: described test bearing vertically rotation is installed in test section, and this test bearing is connected with rotary power unit.
6. a kind of dust atmosphere analogue means as claimed in claim 5, is characterized in that: the air intake direction of described air inlet and the inwall of mixing section are tangent.
7. a method of utilizing the simulating dust environment demarcation dust concentration tester of dust atmosphere analogue means in claim 1, it comprises the following steps:
A. by dust concentration tester to be calibrated, filter membrane method standard sample instrument or dust sampling reference measure instrument are placed on respectively on two placement stations in same level;
B. be continuously simulation chamber one from top to bottom mobile air-flow is provided, the flow velocity of this air-flow be (0-0.2m/s];
C. dust generation device is evenly input to dust in the mixing section of simulating chamber and mixes with air-flow;
D. be mixed with dust air from top to bottom concentrated through the enriching section of simulation chamber successively, after the diffusion of diffuser, be dispersed in test section, then from air outlet, discharge;
E. every the T time period, record the detection numerical value of dust concentration tester to be calibrated and dust sampling reference measure instrument numerical value or filter membrane method standard sample instrument and weigh dust weight once, this T > 2h;
F. by formula
calculate the error of indication of detector to be calibrated;
In formula: δ-error of indication, %;
ρ
1the detection display mean value of-dust concentration tester to be calibrated, unit: mg/m
3;
ρ
0-dust sampling reference measure instrument is measured mean value or the filter membrane method standard sample instrument calculating gained of weighing, unit: mg/m
3.
If in specialized range, dust concentration tester to be calibrated is not defective for δ, if dust concentration tester to be calibrated is qualified in specialized range again for δ.
8. the method for dust atmosphere simulated calibration dust concentration tester as described in claim 7, is characterized in that: in this step C, the even input of dust generation device realizes in the following manner:
C1. in the precompressed of 100-200 object dried dust, shorten particle diameter into powder piece;
C2. powder piece is put in dust generation device;
C3. uniform rotation is brushed in the dispersion in dispersing chamber, and in dispersing chamber, passes into the pressurized air of constant flow rate;
C4. powder piece is at the uniform velocity promoted to contact generation dust with disperseing brush.
9. the method for dust atmosphere simulated calibration dust concentration tester as described in claim 8, it is characterized in that: described dust concentration tester to be calibrated, filter membrane method standard sample instrument or dust sampling reference measure instrument drive and to rotate in same level by testing bearing, speed of rotation be (0-1] R/M.
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| CN108535159A (en) * | 2018-03-30 | 2018-09-14 | 重庆山楂树科技有限公司 | A kind of dust concentration detection device |
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| CN109932159A (en) * | 2019-04-09 | 2019-06-25 | 上海北分科技股份有限公司 | A kind of dust wind tunnel system and its control method |
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