Aerosol mass concentration calibration device

Abstract

The utility model provides an aerosol mass concentration calibration device. The aerosol mass concentration calibration device comprises a standard aerosol generating device, a first sampling pipeline, a second sampling pipeline, an aerosol trapping and weighing device, a first flow controller, a second flow controller and a negative pressure device, inlets of the first sampling pipeline and the second sampling pipeline are respectively connected with a sampling port of a standard aerosol generating device and are used for acquiring aerosol from the same source; a to-be-measured station is arranged on the first sampling pipeline and is used for mounting an aerosol measuring device; the aerosol trapping and weighing device is connected to the second sampling pipeline and is used as a calibration reference; the first flow controller and the second flow controller are respectively arranged on the first sampling pipeline and the second sampling pipeline and are used for adjusting the flow; outlets of the first sampling pipeline and the second sampling pipeline are connected to a negative pressure device and are used for forming the same pipeline negative pressure. The device can be used to calibrate an aerosol measurement device.

Description

Technical Field

[0001] This utility model relates to the field of aerosol detection technology, specifically to an aerosol mass concentration calibration device. Background Technology

[0002] The evaluation and analysis of tobacco products has become particularly important, and the measurement of smoke volume is one of the key aspects of this process.

[0003] Smoke volume is an indicator that directly reflects the amount of smoke released per puff of heated cigarettes, and it is mainly characterized by particle number concentration and mass concentration. Because cigarette smoke aerosols undergo kinetic phenomena such as evaporation, condensation, and coalescence after generation, the particle number concentration continuously changes dynamically while the mass concentration remains relatively constant. Therefore, using mass concentration can more directly and effectively reflect the true amount of smoke per puff.

[0004] Therefore, requirements are placed on the accuracy of the measuring device for detecting mass concentration, and the mass concentration detection accuracy of the measuring device needs to be calibrated. Currently, there is no relatively convenient and accurate device available.

[0005] In order to solve the above problems, people have been seeking an ideal technological solution. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing an aerosol mass concentration calibration device for calibrating aerosol measuring devices.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is: an aerosol mass concentration calibration device, comprising a standard aerosol generating device, a first sampling pipeline, a second sampling pipeline, an aerosol collection and weighing device, a first flow controller, a second flow controller, and a negative pressure device;

[0008] The inlets of the first sampling pipeline and the second sampling pipeline are respectively connected to the sampling port of a standard aerosol generator to obtain aerosols from the same source;

[0009] A test station is set on the first sampling pipeline for installing an aerosol measuring device;

[0010] The aerosol collection and weighing device is connected to the second sampling pipeline and is used as a calibration reference.

[0011] The first flow controller and the second flow controller are respectively installed on the first sampling pipeline and the second sampling pipeline for regulating the flow rate;

[0012] The outlets of both the first and second sampling pipelines are connected to a negative pressure device to create the same negative pressure in the pipelines.

[0013] Based on the above, both ends of the aerosol collection and weighing device are connected to the second sampling pipeline through valves, so as to disconnect the aerosol collection and weighing device for weighing.

[0014] Based on the above, the first sampling pipeline and the second sampling pipeline are respectively connected to different sampling ports of the standard aerosol generator.

[0015] Based on the above, the first sampling pipeline and the second sampling pipeline are connected to the same sampling port of the standard aerosol generator via a T-junction.

[0016] Based on the above, the first flow controller and the second flow controller have the same specifications.

[0017] Based on the above, the aerosol collection and weighing device is an aerosol collection device with a weighing function.

[0018] Based on the above, a connecting valve is provided at the test station for connecting to the aerosol measuring device.

[0019] Based on the above, the aerosol measuring device is a measuring device with aerosol calibration.

[0020] Based on the above, the aerosol collection and weighing device is a nanoscale aerosol collection and weighing device.

[0021] Based on the above, a first flow regulating valve and a second flow regulating valve are respectively installed on the first sampling pipeline and the second sampling pipeline.

[0022] This utility model has substantial features and progress compared to the prior art. Specifically, this utility model has the following advantages:

[0023] Aerosols generated by the same standard aerosol generator are introduced into two sampling pipelines: a calibration pipeline and a reference pipeline. An aerosol trapping device is installed in the reference pipeline, while the calibration pipeline is used to install the aerosol measuring device to be tested. The two pipelines are connected by a flow controller and a negative pressure device to achieve the same flow environment. While the aerosol measuring device to be tested is performing its measurement task, the aerosol trapping device simultaneously traps aerosols. Finally, the accuracy of the aerosol measuring device to be tested is judged by quality comparison. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the aerosol mass concentration calibration device in this utility model.

[0025] In the figure: 1. Standard aerosol generator; 2. First sampling pipeline; 3. Second sampling pipeline; 4. Aerosol collection and weighing device; 5. First flow controller; 6. Second flow controller; 7. Negative pressure device; 8. Aerosol measuring device; 9. First electric flow regulating valve; 10. Second electric flow regulating valve. Detailed Implementation

[0026] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0027] like Figure 1 As shown, an aerosol mass concentration calibration device includes a standard aerosol generator 1, a first sampling pipeline 2, a second sampling pipeline 3, an aerosol collection and weighing device 4, a first flow controller 5, a second flow controller 6, and a negative pressure device 7.

[0028] The inlets of the first sampling pipeline 2 and the second sampling pipeline 3 are respectively connected to the sampling port of the standard aerosol generator 1 to obtain aerosols from the same source.

[0029] In terms of specific connection methods, in this embodiment, the first sampling pipeline 2 and the second sampling pipeline 3 are respectively connected to different sampling ports of the standard aerosol generator 1.

[0030] In other embodiments, the first sampling line and the second sampling line are connected to the same sampling port of a standard aerosol generator via a tee pipe.

[0031] This distinction has no specific advantages or disadvantages, but rather depends on the function of the standard aerosol generator itself.

[0032] A test station is set on the first sampling pipeline 2 for installing the aerosol measuring device 8. In this embodiment, a connecting valve is set at the test station for connecting to the aerosol measuring device.

[0033] The aerosol measuring device 8 is selected as a measuring device with aerosol calibration. The built-in calibration function is not necessary. The purpose of this embodiment is to calibrate the built-in calibration device of the measuring device as well.

[0034] The aerosol collection and weighing device 4 is connected to the second sampling pipeline 3 and is used as a calibration benchmark. In this embodiment, the aerosol collection and weighing device is a nanoscale aerosol collection and weighing device. The aerosol collection and weighing device 4 is an aerosol collection device with a weighing function. Its two ends are respectively connected to the second sampling pipeline 3 through valves 9 for disconnection weighing of the aerosol collection and weighing device 4.

[0035] The first flow controller 5 and the second flow controller 6 are respectively installed on the first sampling pipeline 2 and the second sampling pipeline 3 for adjusting the flow rate. In this embodiment, the first flow controller 5 and the second flow controller 6 are of the same specifications to avoid differences in the conditions of the two sampling pipelines due to the adjustment process.

[0036] For ease of adjustment, in a preferred embodiment, a first flow regulating valve 9 and a second flow regulating valve 10 are respectively installed on the first sampling pipeline and the second sampling pipeline.

[0037] The outlets of the first sampling pipeline 2 and the second sampling pipeline 3 are both connected to the negative pressure device 7 to form the same negative pressure in the pipeline.

[0038] Work process description:

[0039] Step 1: First, the aerosol collection and weighing device 4 is initially weighed and recorded as m0. After weighing, the aerosol collection part is lifted up and connected to the second sampling pipeline 3.

[0040] Step 2: If the standard aerosol generator is not working, turn on the negative pressure device, adjust the first flow controller 5 and the second flow controller 6 to make the flow rates controlled by the two the same. The gas volume flow rate is recorded as v, in L / min. Then turn off the negative pressure device.

[0041] Step 3: Turn on the standard aerosol generator, adjust the aerosol concentration level to the set level, then turn on the negative pressure device and start timing. Record the mass of the aerosol collected by the measuring device with aerosol calibration after 10 minutes as m1. Turn off the negative pressure device and disconnect the valves at both ends of the aerosol collection and weighing device (no flow passes through when the valves are disconnected). At this time, turn on the weighing equipment and weigh the mass of the aerosol collection and weighing device, and record it as m2.

[0042] The calibration of the aerosol-calibrated measuring device is achieved by comparing the mass difference m2-m0 between the aerosol collection and weighing devices with the collection mass m1 of the aerosol-calibrated measuring device.

[0043] In a preferred embodiment, multi-point detection is also performed. Specifically, after the first detection, the aerosol collection and weighing device is replaced, and the above steps are repeated. The standard aerosol generator is changed to adjust different concentration levels. The average mass of aerosol collection measured by the aerosol-calibrated measuring device for 10 minutes is recorded as m3. The negative pressure device is turned off, and the mass of the aerosol collection and weighing device is immediately weighed and recorded as m4.

[0044] By performing multi-point measurements, curve fitting is performed on the measurement results to obtain calibration values; then, direct measurement is performed using a weighing device, and the direct measurement results are compared and calibrated with those of indirect measurement.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. An aerosol mass concentration calibration device, characterized in that: It includes a standard aerosol generator, a first sampling pipeline, a second sampling pipeline, an aerosol collection and weighing device, a first flow controller, a second flow controller, and a negative pressure device; The inlets of the first sampling pipeline and the second sampling pipeline are respectively connected to the sampling port of a standard aerosol generator to obtain aerosols from the same source; A test station is set on the first sampling pipeline for installing an aerosol measuring device; The aerosol collection and weighing device is connected to the second sampling pipeline and is used as a calibration reference. The first flow controller and the second flow controller are respectively installed on the first sampling pipeline and the second sampling pipeline for regulating the flow rate; The outlets of both the first and second sampling pipelines are connected to a negative pressure device to create the same negative pressure in the pipelines.

2. The aerosol mass concentration calibration device according to claim 1, characterized in that: Both ends of the aerosol collection and weighing device are connected to the second sampling pipeline via valves, so as to allow the aerosol collection and weighing device to be disconnected for weighing.

3. The aerosol mass concentration calibration device according to claim 1 or 2, characterized in that: The first sampling pipeline and the second sampling pipeline are respectively connected to different sampling ports of the standard aerosol generator.

4. The aerosol mass concentration calibration device according to claim 1 or 2, characterized in that: The first sampling line and the second sampling line are connected to the same sampling port of the standard aerosol generator via a T-junction.

5. The aerosol mass concentration calibration device according to claim 1, characterized in that: The first flow controller and the second flow controller have the same specifications.

6. The aerosol mass concentration calibration device according to claim 1, characterized in that: The aerosol collection and weighing device is an aerosol collection device with a weighing function.

7. The aerosol mass concentration calibration device according to claim 1, characterized in that: A connection valve is installed at the work station to be tested for connection to the aerosol measuring device.

8. The aerosol mass concentration calibration device according to claim 1 or 7, characterized in that: The aerosol measuring device is a measuring device with aerosol calibration.

9. The aerosol mass concentration calibration device according to claim 1, characterized in that: The aerosol capture device is a nanoscale aerosol capture device.

10. The aerosol mass concentration calibration device according to claim 1, characterized in that: A first flow regulating valve and a second flow regulating valve are respectively installed on the first sampling pipeline and the second sampling pipeline.

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