CN217542136U - Aerosol dilution system and photometer calibrating device - Google Patents

Abstract

The utility model discloses an aerosol dilution system and a photometer calibrating device, wherein the dilution system comprises a mixing diluter, a first dilution gas circuit and a mixing gas circuit; the blending diluter comprises a blending cavity, a first diluent gas inlet, a mixed gas inlet and a gas outlet, wherein the first diluent gas inlet, the mixed gas inlet and the gas outlet are communicated with the blending cavity; the first dilution gas path is connected with the first dilution gas inlet and used for providing a first path of dilution gas to the mixing cavity; the mixing gas path is connected with the mixed gas inlet, the mixing gas path is respectively connected with the second dilution gas path and the aerosol gas path, and the second dilution gas path is mixed with the aerosol and flows into the mixing cavity through the mixed gas inlet under the negative pressure action of the inner cavity of the mixing diluter; and the diluent gas in the first dilution gas circuit and the mixed gas in the mixed gas circuit are diluted and mixed uniformly in the mixing cavity. This dilution system can realize accurate dilution ratio, and it is accurate to dilute than adjusting, effectively improves the calibration accuracy of photometer.

Description

Aerosol dilution system and photometer calibrating device

Technical Field

The utility model relates to an aerosol detects technical field, especially relates to an aerosol dilutes system and photometer calibrating device.

Background

Aerosols are colloidal dispersions, also known as gas dispersions, of small particles of a solid or liquid dispersed and suspended in a gaseous medium. The dispersed phase is solid or liquid small particles with size of 0.001-100 μm, and the dispersion medium is gas. The aerosol has wide application in medicine, environmental science and military science.

In many airborne particle measurement and particle concentration studies, aerosol photometers are used to detect the mass concentration of particles in the monitored environment. Currently, in the production and detection of filter materials such as masks and melt-blown fabrics, aerosol particles are used for detecting the filtering efficiency of the filter materials. The aerosol photometer is a simple optical measurement system, and can realize real-time detection of the mass concentration of the aerosol by establishing the relation between the mass concentration of the aerosol and a photoelectric signal of a photoelectric detector.

Calibration of the photometer requires an accurate photometer calibration device: the generated aerosol has controllable concentration (0-120 mug/L), uniform mixing and good concentration stability.

The aerosol dilution system is used as a key structure of a photometer calibration device, and can directly influence the accuracy and stability of photometer calibration. The aerosol dilution system may also be used with aerosol detection devices such as Condensation Particle Counters (CPCs), optical Particle Counters (OPCs), spectrometers, or other types of particle monitoring devices known in the art, including virtual impactors, cascade impactors, and the like.

Common aerosol dilution systems in the prior art generally adopt one path of dilution gas and one path of aerosol to be directly mixed in a mixing box, the dilution ratio of the aerosol is not well adjusted, the mixing is not uniform, and the calibration precision of a photometer is influenced.

The above information disclosed in this background section is only for enhancement of understanding of the background section of the application and therefore it may contain prior art that does not constitute known technology to those of ordinary skill in the art.

SUMMERY OF THE UTILITY MODEL

To the problem pointed out in the background art, the utility model provides an aerosol dilutes system and photometer calibrating device, this dilutes the system and can realize accurate dilution ratio, and it is accurate to dilute than adjusting, effectively improves the calibration accuracy of photometer.

In order to realize the purpose of the utility model, the utility model adopts the following technical scheme to realize:

the utility model provides an aerosol dilutes system, include:

the mixing diluter comprises a mixing cavity, and a first dilution gas inlet, a mixed gas inlet and a gas outlet which are communicated with the mixing cavity;

the first dilution gas path is connected with the first dilution gas inlet and is used for providing a first path of dilution gas to the mixing cavity;

the mixing gas path is connected with the mixed gas inlet, the mixing gas path is respectively connected with a second dilution gas path and an aerosol gas path, and a second path of dilution gas in the second dilution gas path is mixed with the aerosol in the aerosol gas path and then flows into the mixing cavity through the mixed gas inlet;

and the diluent gas in the first diluent gas circuit and the mixed gas in the mixed gas circuit are diluted and mixed uniformly in the mixing cavity.

In some embodiments of the present application, the first dilution gas inlet and the gas outlet are oppositely disposed at two ends of the blending diluter;

a communicating section communicated with the first diluent gas inlet and the blending cavity is arranged in an inner cavity of the blending diluter, and the mixed gas inlet is communicated with the communicating section;

the side wall of the mixing diluter is provided with an adjusting rod, one end of the adjusting rod extends into the communicating section and is right opposite to the mixed gas inlet, the end part of the adjusting rod is in conical fit with the gas outlet end of the mixed gas inlet, and the mixed gas inflow of the mixed gas circuit is adjusted through the movement of the adjusting rod.

In some embodiments of this application, be equipped with the section with higher speed in the inner chamber of mixing diluter, the one end of section with first dilution gas entry intercommunication with higher speed, the other end with the intercommunication section intercommunication.

In some embodiments of this application, the mixing chamber certainly the intercommunication section to the direction of gas outlet is the divergent structure.

In some embodiments of the present application, the second dilutes the gas circuit with the aerosol gas circuit pass through the tee bend structure with mix the gas circuit and connect, the tee bend structure with be equipped with flow detection device on the pipeline between the gas outlet.

In some embodiments, the first dilution gas circuit and the aerosol gas circuit are supplied with clean gas from the same gas supply system, and the second dilution gas circuit draws clean gas from the atmosphere through a dryer and a filter.

In some embodiments of the present application, a flow rate adjusting device is respectively disposed on the first dilution gas circuit, the second dilution gas circuit, and the aerosol gas circuit.

In some embodiments of this application, the gas outlet of mixing diluter passes through the pipeline and is connected with the baffle-box, be equipped with the atmospheric pressure balance filter on the baffle-box.

The utility model also provides a photometer calibrating device, which comprises an air source system, a calibrating system and the aerosol diluting system;

the gas source system provides clean gas for the first dilution gas circuit and the aerosol gas circuit;

the calibration system comprises a sampling cavity, the sampling cavity is connected with a photometer and a calibrated photometer, and the mixing cavity is communicated with the sampling cavity through a pipeline.

In some embodiments of this application, the calbiration system includes anchor clamps and lower anchor clamps, go up anchor clamps with anchor clamps relative motion encloses with the butt joint down and becomes the sample chamber, go up anchor clamps with be equipped with weighing filter membrane anchor clamps and splitter ring down between the anchor clamps, the photometer with by the calibration photometer pass through the pipe connection in on the splitter ring, the end connection aspiration pump of giving vent to anger of anchor clamps down.

Compared with the prior art, the utility model discloses an advantage is with positive effect:

the utility model discloses an adopt two way dilution gas and one way aerosol to mix among the aerosol dilution system, and wherein one way dilution gas and aerosol are inhaled under the negative pressure effect of mixing diluter, when diluting the proportion regulation, first dilution gas circuit and aerosol gas circuit play main regulatory action, the second dilutes the gas circuit and plays supplementary fine setting effect, help realizing accurate flow ratio, in order to obtain accurate dilution ratio, and it is wide to dilute than adjustable scope.

Carry out the efflux through mixing diluter to dilution gas and aerosol and mix, the aerosol mixes and dilutes evenly to can further mix in the buffer tank, further improve mixing uniformity on the one hand, on the other hand can avoid the stability of air current in the air current fluctuation influence photometer calibration system, improve the calibration accuracy.

The flow of first dilution gas circuit, second dilution gas circuit and aerosol gas circuit is adjustable, can just accurate control mix the dilution ratio, satisfies different calibration experiment demands.

The aerosol dilution system can determine the dilution ratio of the dilution system in a substantially real-time, constant or periodic manner, so that the generated aerosol concentration is controllable (0-120 mu g/L) and the generated aerosol concentration is stable.

In the whole dilution and calibration process, the aerosol flows dynamically all the time, so that adverse effects such as concentration steep increase and sudden drop of the aerosol when the aerosol is static can be effectively prevented, and the calibration precision is ensured.

Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when read in conjunction with the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive labor.

FIG. 1 is a schematic diagram of the construction of a luminometer calibration apparatus according to an embodiment;

FIG. 2 is a schematic diagram of a mix diluter according to an embodiment;

FIG. 3 is a top view of a dilution blend mixer according to an embodiment;

FIG. 4 isbase:Sub>A sectional view taken along line A-A of FIG. 3;

FIG. 5 is a schematic structural diagram of a tee junction structure according to an embodiment;

FIG. 6 is a sectional view taken along line B-B of FIG. 5;

reference numerals:

100-a gas source system;

101-air compressor, 102-steam drum, 103-refrigeration dryer, 104-dryer, 105-high efficiency filter;

200-a dilution system;

201-a first flow regulating valve, 202-a first temperature-measuring sensor, 203-a first differential pressure sensor, 204-a first orifice flow meter, 205-a mixing diluter, 2051-a first dilution gas inlet, 2052-an adjusting rod, 2053-a communicating section, 2054-a conical structure, 2055-an accelerating section, 2056-a mixed gas inlet, 2057-a mixing cavity, 2058-an air outlet, 206-a second dilution gas filter, 207-a second temperature-measuring sensor, 208-a second orifice differential pressure sensor, 209-a second flow regulating valve, 210-a second orifice flow meter, 211-a third orifice flow meter, 212-a third orifice differential pressure sensor, 213-a third temperature-measuring sensor, 214-a mixing tee, 2141-a main pipeline, 2142-a branch pipeline, 215-an electrostatic meter, 216-an orifice plate, 217-an aerosol regulating valve, 218-an aerosol generator regulating valve, 219-a pressure gauge, 220-a spray head, 221-an aerosol generator liquid storage tank, 222-a residual gas filter, 223-an air pressure balance filter, 224-a second air buffer tank 225, and a drying diluter;

300-calibrating the system;

301-two-position five-way electromagnetic valve, 302-clamping cylinder, 303-gripper bracket, 304-shunt ring, 305-upper gripper cavity, 306-weighing filter membrane fixture, 307-photometer, 308-calibrated photometer, 309-pump front end filter, 310-pump front end temperature sensor, 311-pump front end orifice flowmeter, 312-pump front end pressure difference sensor, 313-air suction pump and 314-lower gripper cavity;

s1, a first dilution gas circuit;

s2, a second dilution gas circuit;

s3, an aerosol gas circuit;

s4, mixing a gas circuit;

q1-first path of dilution gas;

q2-second path of dilution gas;

q3-aerosol;

p-mixed gas.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present application.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, the meaning of "a plurality" is two or more unless otherwise specified.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present disclosure may repeat reference numerals and/or reference letters in the various examples for purposes of simplicity and clarity and do not in itself dictate a relationship between the various embodiments and/or arrangements discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

The present embodiment discloses a photometer calibration device that calibrates a photometer with an aerosol of a specific concentration.

Referring to fig. 1, a photometer calibration device includes a gas supply system 100, an aerosol dilution system 200, and a calibration system 300.

The gas supply system 100 is used to provide a gas supply to the aerosol dilution system 200 and the calibration system 300.

The aerosol dilution system 200 is used to dilute the aerosol to obtain a concentration of aerosol for use by the calibration system 300.

The aerosol dilution system 200 mainly includes a blending diluter 205, a first dilution gas path S1, a mixing gas path S4, and a buffer tank 224.

The mixing diluter 205 is a key component of the aerosol dilution system 200, and is used for mixing and diluting the dilution air and the aerosol, and the mixed and diluted aerosol flows into the buffer tank 224 for use by the photometer calibration system 300.

The gas entering the mixing diluter 205 has three paths, which are a first path of dilution gas, a second path of dilution gas and aerosol, wherein the first path of dilution gas is provided by a first dilution gas path S1, the second path of dilution gas is provided by a second dilution gas path S2, and the aerosol is provided by an aerosol gas path S3.

The second dilution gas path S2 and the aerosol gas path S3 are connected to the mixing gas path S4 at the same time, and the second dilution gas and the aerosol gas are mixed in the mixing gas path S4 and then flow into the mixing diluter 205 to be mixed and diluted with the first dilution gas for the second time.

The blending diluter 205 is provided with a blending cavity 2057 inside, and the wall of the blending diluter is provided with a first diluent gas inlet 2051, a mixed gas inlet 2056 and a gas outlet 2058 which are communicated with the blending cavity 2057.

The first dilution gas path S1 is connected to the first dilution gas inlet 2051, and the dilution gas in the first dilution gas path S1 flows into the kneading chamber 2057 through the first dilution gas inlet 2051.

The mixing gas path is connected with the blending gas inlet 2056, and the dilution gas in the second dilution gas path S2 is mixed with the aerosol in the aerosol gas path S3 and flows into the blending chamber 2057 through the mixing gas inlet 2056 under the negative pressure action of the inner chamber of the blending diluter 205.

The first path of diluted gas and the mixed gas are mixed and diluted in the mixing chamber 2057, and then flow to the buffer tank 224 through the gas outlet 2058.

Carry out the efflux through mixing diluter 205 to dilution gas and aerosol and mix, the aerosol mixes and dilutes evenly to can further mix in surge-box 224, further improve mixing uniformity on the one hand, on the other hand can avoid the stability of air current in the air current fluctuation influence photometer calibration system 300, improve the calibration accuracy.

The flow of the first dilution gas circuit S1, the second dilution gas circuit S2 and the aerosol gas circuit S3 is adjustable, the mixing dilution proportion can be accurately controlled, and different calibration experiment requirements are met.

Adopt two way diluent gas and one way aerosol to mix to wherein one way diluent gas and aerosol are inhaled under the negative pressure effect of mixing chamber 2057, when diluting proportion regulation, first dilution gas circuit S1 and aerosol gas circuit S3 play main regulatory action, and second dilution gas circuit S2 plays supplementary fine setting effect, helps realizing accurate flow ratio, in order to obtain accurate dilution ratio, and the dilution ratio adjustable scope is wide.

In the whole dilution and calibration process, the aerosol flows dynamically all the time, so that adverse effects such as concentration steep increase and sudden drop of the aerosol when the aerosol is static can be effectively prevented, and the calibration precision is ensured.

In some embodiments of the present application, referring to fig. 2 to 4, the first dilution gas inlet 2051 and the gas outlet 2058 are oppositely disposed at two ends of the mixing diluter 205; a communicating section 2053 communicated with the first diluent gas inlet 2051 and the blending cavity 2057 is arranged in an inner cavity of the blending diluter 205, the communicating section 2053 is vertically arranged between the first diluent gas inlet 2051 and the blending cavity 2057, and the mixed gas inlet 2056 is arranged at a position close to the middle of the side wall of the blending diluter 205 and is communicated with the communicating section 2053.

The first path of dilution gas flows in through the first dilution gas inlet 2051, and flows into the blending cavity 2057 through the communicating section 2053, negative pressure is generated at the communicating section 2053, and by using the venturi principle, the mixed gas formed by mixing the second path of dilution gas and the aerosol in the mixed gas path S4 is sucked in through the mixed gas inlet 2056, flows into the blending cavity 2057 together with the first path of dilution gas, and flows out through the gas outlet 2058.

An adjusting rod 2052 is arranged on the side wall of the blending diluter 205, the adjusting rod 2052 is arranged opposite to the mixed gas inlet 2056, one end of the adjusting rod 2052 extends into the communicating section 2053 and is opposite to the mixed gas inlet 2056, the end part of the adjusting rod 2052 is in conical fit with the gas outlet end of the mixed gas inlet 2056, and the mixed gas inflow of the mixed gas path S4 is adjusted by the movement of the adjusting rod 2052.

In some embodiments of the present application, an accelerating section 2055 is provided in the inner cavity of the blending diluter 205, one end of the accelerating section 2055 is communicated with the first diluent gas inlet 2051, the other end of the accelerating section is communicated with the communicating section 2053, the accelerating section 2055 accelerates the first path of flowing diluent gas, so as to improve the effect of negative pressure generated at the communicating section 2053, and meanwhile, the first path of flowing diluent gas has the effect of jet impact on the mixed gas flowing in from the mixed gas inlet 2056, so that the blending effect is improved.

In some embodiments of the present application, the first dilution gas inlet 2051 and the acceleration section 2055 are transitionally connected by a tapered conical structure 2054, which plays a role in guiding the flow.

In some embodiments of the application, the mixing cavity 2057 is in a gradually expanding structure from the communicating section 2053 to the gas outlet 2058, so that the mixing effect of the first path of diluent gas and the mixed gas is improved, and the mixed and diluted gas can flow downstream through the gas outlet 2058.

In some embodiments of the present application, the second dilution gas path S2 and the aerosol gas path S3 are connected to the mixing gas path S4 through the three-way structure 214, and a flow detection device, which is marked as a third flow detection device, is disposed on a pipeline between the three-way structure 214 and the mixed gas inlet 2056, and is used for detecting the flow rate of the mixed gas.

The third flow detecting device comprises a third orifice flow meter 211, a third orifice differential pressure sensor 212 and a third temperature sensor 213, wherein the third orifice differential pressure sensor 212 is used for measuring the differential pressure before and after the orifice plate, and the third temperature sensor 213 is used for measuring the temperature before the orifice plate.

As shown in fig. 5 and fig. 6, the three-way structure 214 includes a main pipeline 2141 having two through ends and a branch pipeline 2142 inserted into the main pipeline 2141, the branch pipeline 2142 is an L-shaped structure, the branch pipeline 2142 is disposed on a side wall of the main pipeline 2141, and an air outlet end of the branch pipeline 2142 extends along a gas flowing direction in the main pipeline 2141.

The inner diameter of the main pipeline 2141 is greater than the inner diameter of the branch pipeline 2142, one end of the main pipeline 2141 is connected to the aerosol gas circuit S3, the other end is connected to the mixing gas circuit S4, and the branch pipeline 2142 is connected to the second dilution gas circuit S2.

The aerosol and the second diluent gas are mixed in the main pipe 2141 and then flow together to the mixed gas path S4.

In some embodiments of the present application, the first dilution air path S1 is provided with a first flow regulating valve 201 and a first flow detecting device.

The first flow regulating valve 201 is used for regulating the flow of the first path of dilution gas.

The first flow detection device is used for detecting the flow of the first path of dilution gas and comprises a first orifice flowmeter 204, a first orifice differential pressure sensor 203 and a first temperature sensor 202, wherein the first orifice differential pressure sensor 203 is used for measuring the differential pressure before and after the orifice plate, and the first temperature sensor 202 is used for measuring the temperature before the orifice plate is measured.

In some embodiments of the present application, the second dilution gas circuit S2 is provided with a second dilution gas dryer 225, a second dilution gas filter 206, a second flow regulating valve 209, and a second flow detecting device.

The second flow regulating valve 209 is used for regulating the flow of the second path of the dilution gas.

The second flow rate detecting device is used for detecting the flow rate of the second path of dilution gas and comprises a second orifice flow meter 210, a second orifice differential pressure sensor 208 and a second temperature sensor 207, wherein the second orifice differential pressure sensor 208 is used for measuring the differential pressure before and after the orifice plate, and the second temperature sensor 207 is used for measuring the temperature before the orifice plate is measured.

The second path of dilution air passes through the second dilution air dryer 225 and the second dilution air filter 206 under the negative pressure generated by the mixing diluter 205, so as to filter moisture and particulate matters in the air, and then passes through the second flow regulating valve 209 and the second flow detecting device to be mixed with the aerosol in the three-way structure 214.

In some embodiments of the present disclosure, the aerosol gas circuit S3 includes an aerosol generator regulating valve 218, a spray head 220, a liquid storage tank 221, a residual gas filter 222, an aerosol regulating valve 217 (adopting a ball valve), an orifice plate current limiter 216, and an aerosol electrometer 215, where the electrometer 215 is disposed between the three-way structure 214 and the orifice plate current limiter 216.

Clean compressed air flows to the spray head 20 through the aerosol generator regulating valve 218, the spray head 220 is immersed in a solution in a liquid storage tank 221 of the aerosol generator, the spray head 220 generates aerosol under the action of the compressed air, the generated aerosol is divided into two paths, one path of aerosol is discharged through the residual air filter 222, the other path of aerosol flows to the three-way structure 214 through the aerosol regulating valve 217 and the orifice plate flow restrictor 216 under the action of negative pressure generated by the mixing diluter 205 and is mixed with the second path of dilution air, and the mixed air flows into the mixing diluter 205 through the mixed air path S4 and the third flow detection device.

An example of the calculation of the dilution ratio is as follows:

the concentration of the aerosol passing through the orifice plate flow restrictor 216 measured by the electrometer 215 is 1ug/L, the flow of the first dilution gas measured by the first orifice flow meter 204 is 100L/min, the flow of the third orifice flow meter 211 is 1L/min by adjusting the adjusting rod 2052 of the mixing diluter, the flow of the second dilution gas passing through the second orifice flow meter 210 is 0.5L/min by adjusting the second flow adjusting valve 209, the flow of the aerosol entering the three-way structure 214 through the orifice plate flow restrictor 216 is 1-0.5=0.5L/min, the concentration of the aerosol entering the mixing diluter 205 is 0.5 × 1/1=0.5ug/L, and the concentration of the aerosol entering the buffer tank 224 after entering the mixing diluter 205 is: 0.5 + 1/(100 + 1) =0.00495ug/L, the dilution ratio at this time is 1:0.00495, close to a 202 fold dilution ratio. A greater dilution ratio can be achieved by adjusting the rod 2052 and the second flow regulating valve 209.

The dilution system in the embodiment can determine the dilution ratio of the dilution system in a substantially real-time, constant or periodic manner, so that the generated aerosol concentration is controllable (0-120 mug/L) and stable.

In some embodiments of this application, be connected with atmospheric pressure balance filter 223 on buffer tank 224, from mixing diluter 205 outflow gas inflow buffer tank 224 after, present certain malleation in the buffer tank 224, come the atmospheric pressure in the balanced buffer tank 224 through atmospheric pressure balance filter 223, help improving the atmospheric pressure stability in the calibration system 300, improve the calibration precision.

In some embodiments of the present disclosure, the first dilution gas path S1 and the aerosol gas path S3 are provided by the same gas source system 100 to provide clean compressed gas, and the second dilution gas path S2 draws clean gas from the atmosphere through a dryer and a filter.

The air source system 100 has few air paths and stable air flow, and is beneficial to improving the stability and accuracy of the whole system.

In some embodiments of the present application, the air supply system 100 includes an air compressor 101, a steam drum 102, a cold dryer 103, a dryer 104, and a high efficiency filter 105, which are connected in sequence.

The air compressor 101 inflates the steam pocket 102, the inflation is stopped when the air pressure reaches a certain pressure, the compressed air is subjected to moisture removal in the air through the cold dryer 103, unremoved water drops are adsorbed through the dryer 104, and particles in an air source are filtered through the high-efficiency filter 105, so that clean compressed air is obtained.

The clean compressed gas is divided into three paths, one path being supplied to the first dilution gas path S1, one path being supplied to the aerosol gas path S3, and one path being supplied to the calibration system 300.

In some embodiments of the present application, the calibration system 300 includes an upper clamp chamber 305 and a lower clamp chamber 314, the upper clamp chamber 305 and the lower clamp chamber 314 move relative to each other to form a sampling chamber, the upper and lower relative movements of the upper clamp chamber 305 and the lower clamp chamber 314 are achieved by the clamp cylinder 302, and a path of compressed air from the air supply system 100 powers the clamp cylinder 302. A weighing filter membrane clamp 306 and a shunt ring 304 are arranged between the upper clamp cavity 305 and the lower clamp cavity 314, a photometer 307 and a calibrated photometer 308 are connected to the shunt ring 304 through pipelines, the air outlet end of the lower clamp cavity 314 is connected with an air suction pump 313, and the photometer 307 and the calibrated photometer 308 are respectively provided with a power source.

Compressed air in the calibration system 300 is connected to a two-position five-way electromagnetic valve 301, a clamping cylinder 302 is controlled to act, an upper clamp cavity 305 is further controlled to move up and down, and the clamping cylinder 302 and a lower clamp cavity 314 are respectively fixed to the upper portion and the lower portion of a clamp holder support 303. The upper clamp cavity 305 and the lower clamp cavity 314 are respectively provided with a splitter ring 304 and a weighing filter membrane clamp 306 from top to bottom, two air outlet connectors are symmetrically arranged on the splitter ring 304 and are respectively connected with a precision aerosol photometer 307 and a calibrated aerosol photometer 308, the lower end of the lower clamp cavity 314 is sequentially connected with a pump front end filter 309, a pump front end orifice flowmeter 311 and an air suction pump 313, the front end of a pore plate of the pump front end orifice flowmeter 311 and the two sides of the pore plate are respectively provided with a pump front end temperature measuring sensor 310 and a pump front end orifice differential pressure sensor 312, the pump front end temperature measuring sensor 310 measures the front temperature of the pore plate of the pump front end orifice flowmeter 311, the pump front end orifice differential pressure sensor 312 measures the pressure difference of the front end orifice flowmeter 311 and the back of the pore plate of the pump front end orifice flowmeter 311, so as to calculate the air suction flow of the air suction pump 313, and the flow measured by the pump front end orifice flowmeter 311 is kept consistent with the sampling flow of the precision aerosol 307 and the calibrated aerosol photometer 308 by adjusting the rotating speed of the air suction pump 313.

The buffer box 224 is communicated with a sampling cavity in the calibration system 300 through a pipeline, aerosol in the buffer box 224 flows into a cavity (namely, a sampling cavity) formed by the upper clamp cavity 305, the lower clamp cavity 314, the weighing filter membrane clamp 306 and the diverter ring 304 under the action of the air suction pump 313, the precision aerosol photometer 307 and the calibrated aerosol photometer 308, and the aerosol in the cavity is ensured to be uniformly distributed due to the fact that the air suction flow of the air suction pump 313, the precision aerosol photometer 307 and the calibrated aerosol photometer 308 are consistent. When the photometer is calibrated, the weighing filter membrane is placed on the weighing filter membrane clamp 306, the air suction pump 313, the precision aerosol photometer 307 and the calibrated aerosol photometer 308 can simultaneously suck air, and the aerosol is uniformly distributed, so that the aerosol quantity entering the precision aerosol photometer 307, the aerosol quantity captured by the calibrated aerosol photometer 308 and the aerosol quantity captured by the filter membrane can ensure good consistency, the indicating value concentration of the precision aerosol photometer 307 is used for calibrating the calibrated aerosol photometer 308, and meanwhile, the aerosol captured by the filter membrane can be used as the tracing source of a calibration result.

In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. An aerosol dilution system, comprising:

the mixing diluter comprises a mixing cavity, and a first dilution gas inlet, a mixed gas inlet and a gas outlet which are communicated with the mixing cavity;

the first dilution gas path is connected with the first dilution gas inlet and is used for providing a first path of dilution gas to the uniform mixing cavity;

the mixing gas path is connected with the mixed gas inlet, the mixing gas path is respectively connected with a second dilution gas path and an aerosol gas path, and a second path of dilution gas in the second dilution gas path is mixed with the aerosol in the aerosol gas path and then flows into the mixing cavity through the mixed gas inlet;

and the diluent gas in the first diluent gas circuit and the mixed gas in the mixed gas circuit are diluted and mixed uniformly in the mixing cavity.

2. An aerosol dilution system according to claim 1,

the first dilution gas inlet and the gas outlet are oppositely arranged at two ends of the blending diluter;

a communicating section communicated with the first diluent gas inlet and the blending cavity is arranged in an inner cavity of the blending diluter, and the mixed gas inlet is communicated with the communicating section;

the side wall of the mixing diluter is provided with an adjusting rod, one end of the adjusting rod extends into the communicating section and is right opposite to the mixed gas inlet, the end part of the adjusting rod is in conical fit with the gas outlet end of the mixed gas inlet, and the mixed gas inflow of the mixed gas circuit is adjusted through the movement of the adjusting rod.

3. An aerosol dilution system according to claim 2,

an accelerating section is arranged in an inner cavity of the mixing diluter, one end of the accelerating section is communicated with the first dilution gas inlet, and the other end of the accelerating section is communicated with the communicating section.

4. An aerosol dilution system according to claim 2,

the mixing cavity is of a gradually expanding structure from the communicating section to the gas outlet.

5. An aerosol dilution system according to any one of claims 1 to 4,

the second dilution gas circuit and the aerosol gas circuit are connected with the mixed gas circuit through a tee structure, and a flow detection device is arranged on a pipeline between the tee structure and the gas outlet.

6. An aerosol dilution system according to claim 5,

the three-way structure comprises a main pipeline with two through ends and a branch pipeline inserted on the main pipeline, the branch pipeline is of an L-shaped structure, and the gas outlet end of the branch pipeline extends along the flowing direction of gas in the main pipeline;

one end of the main pipeline is connected with the aerosol gas circuit, the other end of the main pipeline is connected with the mixing gas circuit, and the branch pipeline is connected with the second dilution gas circuit.

7. An aerosol dilution system according to any one of claims 1 to 4,

the first dilution gas circuit and the aerosol gas circuit are provided with clean gas by the same gas source system, and the second dilution gas circuit absorbs the clean gas from the atmosphere through a dryer and a filter.

8. An aerosol dilution system according to any one of claims 1 to 4,

and flow regulating devices are respectively arranged on the first diluting gas circuit, the second diluting gas circuit and the aerosol gas circuit.

9. A photometer calibration device, comprising:

a gas source system, a calibration system, and an aerosol dilution system according to any one of claims 1 to 8;

the gas source system provides clean gas for the first dilution gas circuit and the aerosol gas circuit;

the calibration system comprises a sampling cavity, the sampling cavity is connected with a photometer and a calibrated photometer, and the mixing cavity is communicated with the sampling cavity through a pipeline.

10. Photometer calibration apparatus according to claim 9,

the calibration system comprises an upper clamp and a lower clamp, the upper clamp and the lower clamp move relatively to form the sampling cavity in a butt-joint and surrounding mode, a weighing filter membrane clamp and a shunt ring are arranged between the upper clamp and the lower clamp, the photometer and the calibrated photometer are connected to the shunt ring through pipelines, and the air outlet end of the lower clamp is connected with an air suction pump.

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