CN201434815Y - Real-time detection device for cigarette smoke aerosol particle size distribution - Google Patents

Abstract

The utility model discloses a real-time detection device for cigarette smoke aerosol particle size distribution, which comprises a smoking machine (1), a diluter (2), an aerosol particle size spectrometer (3), and a temperature regulator (4). The above-mentioned smoking machine (1) is connected to the diluter (2) by the metal pipe (8) through the electromagnetic valve (9), and the other end of the diluter (2) is connected to the aerosol particle size spectrometer (3) through the metal pipe (8). Connected, the diluter (2) is provided with an exhaust gas outlet G; the smoking machine (1) and the diluter (2), the diluter (2) and the aerosol particle size spectrometer (3) are respectively passed through metal pipes (8) The heater (5) is connected, and the heater (5) is controlled by the temperature regulator (4), and the heater (5) is connected with the electronic flow meter (6) and the filter (7) in sequence. The utility model ensures that the collected smoke aerosol samples not only meet the smoking requirements of cigarette samples, but also make the concentration of the sample gas entering the aerosol particle size spectrometer within the effective detection range of the instrument; At the same time, the technology of heating partly connected pipelines reduces the loss of cigarette smoke aerosol particles during transmission.

Description

Real-time detection device for cigarette smoke aerosol particle size distribution

technical field

The utility model belongs to the technical field of analysis and detection, and in particular relates to a real-time detection device for cigarette smoke aerosol particle size distribution for real-time detection of cigarette smoke aerosol particle size distribution.

Background technique

In the prior art, when the aerosol particle size spectrometer is used to measure the distribution of the aerosol particle size in the cigarette sample smoke, it is mainly connected through the smoking machine, the diluter and the particle size spectrometer, because the gas in the cigarette smoke The concentration of the sol is far greater than the concentration in the air. The concentration of the diluted gas in the diluter cannot meet the requirements of the particle size spectrometer for detection, which may easily cause serious overload of the aerosol particle size spectrometer during suction. There is no difference in the value, the test results are all the maximum value or exceed the detection limit of the instrument, etc., so that the detection and analysis cannot be carried out. Moreover, during the process of cigarette smoke flowing through the gas pipeline, the smoke is likely to condense on the pipe wall and attach to the wall of the gas transmission pipe, resulting in the loss of the smoke in the process of dilution and transportation, affecting the quality of the smoke. The accuracy of sol particle size analysis and detection leads to large errors in the analysis and detection results. In addition, if the gas concentration of the input flue gas sample is too high, the tar in the flue gas will easily stick to the aerosol detection instrument, which will easily cause the instrument to be blocked, the internal pressure will be too high, the flow rate will be unstable, and cleaning will be difficult. Therefore, in the existing analysis and detection technology of cigarette smoke aerosol, there is a lack of a detection device that is stable, adjustable gas concentration, temperature and flow rate, and can detect fresh smoke in real time, so that the existing aerosol detection Technology cannot detect the aerosol particle size distribution in cigarette smoke in real time, accurately and easily. For this reason, the designer has developed a real-time detection device for cigarette smoke aerosol particle size distribution after long-term practical research.

Utility model content

The purpose of the utility model is to provide a real-time detection device for cigarette smoke aerosol particle size distribution with stable process, simple operation and accurate measurement.

The purpose of this utility model is achieved through the following technical proposals: comprising a smoking machine, a diluter, an aerosol particle size spectrometer, and a temperature regulator. One end communicates with the aerosol particle size spectrometer through a metal tube. The diluter is provided with an exhaust gas outlet G. The smoking machine and the diluter, and the diluter and the aerosol particle size spectrometer are respectively connected to a heater through a metal tube. Controlled by the temperature regulator, the heater is connected to the electronic flow meter and the filter in turn.

The utility model improves the connection design between the flue gas generator and the aerosol particle size spectrometer, adopts an additional adjustable auxiliary gas, sets a suitable airflow velocity, maintains the temperature of the clean air intake pipeline, and reduces the temperature of the flue gas transportation process. Condensation loss generated on the pipe wall; while detecting cigarette smoke samples in real time, the collected smoke aerosol samples not only meet the smoking requirements of cigarette samples, but also make the concentration of the sample gas entering the aerosol particle size spectrometer in the instrument Within the effective detection range, the purpose of dynamic real-time detection is realized.

Description of drawings

The utility model will be further described below in conjunction with the accompanying drawings, but the utility model is not limited in any way.

Fig. 1 is a schematic diagram of the overall structure and working principle of the utility model;

Fig. 2 is the detection result schematic diagram that prior art detects smoke aerosol particle size distribution;

Fig. 3 is a schematic diagram of the detection results of the utility model without an adjustable temperature air intake device;

Fig. 4 is a schematic diagram of the detection results of the utility model for detecting the particle size distribution of cigarette smoke aerosol.

Among them: 1-smoking machine, 2-diluter, 3-aerosol particle size spectrometer, 4-temperature regulator, 5-heater, 6-electronic flowmeter, 7-filter, 8-metal tube, 9- The electromagnetic valve.

Detailed ways

As shown in Figure 1, the utility model comprises smoking machine 1, diluter 2, aerosol particle size spectrometer 3, temperature regulator 4, and described smoking machine is communicated with diluter 2 by metal pipe 8 through electromagnetic valve 9, dilutes The other end of device 2 is communicated with aerosol particle size spectrometer 3 through metal pipe 8, and exhaust gas outlet G is provided on diluter 2, between smoking machine and diluter 2, between diluter 2 and aerosol particle size spectrometer 3 respectively The metal pipe 8 communicates with the heater 5, the heater 5 is controlled by the temperature regulator 4, and the heater 5 communicates with the electronic flow meter 6 and the filter 7 in turn.

The working range of the electronic flowmeter 6 is 10lpm-15lpm.

The working range of the heater 5 is 20°C to 120°C.

The smoking machine is a suction device for sucking cigarette smoke samples according to the national standard. The flow setting of the airflow (referred to as mixed gas G1) flowing out of the smoking machine cannot be changed at will. The general detection range: 1lpm~2lpm. The solenoid valve in the smoking machine communicates with the ambient air, and is set to smoke once a minute, of which 2s are connected to the smoking machine for cigarette smoke collection, and 58s are switched to sucking ambient air, and the process is repeated until the cigarette samples are smoked.

The gas flow to be tested entering the aerosol particle size spectrometer 3 , referred to as the mixed gas G4, is controlled by the aerosol particle size spectrometer and has a fixed value ranging from 10 lpm to 40 lpm.

The dilution ratio of the diluter 2 is 20:1-1800:1. It can be guaranteed that the mixed gas 4 entering the aerosol particle size spectrometer 3 meets the detection requirements of the aerosol particle size spectrometer 3 after the third stage of dilution.

Working principle of the utility model:

The metal pipe connected to the smoking machine, the temperature regulator, the heater, the electronic flow meter and the filter constitute the first stage dilution device of the utility model; the diluter and the exhaust gas discharge port G constitute the second stage dilution device; the connection diluter , the metal tube of the aerosol particle size spectrometer, the temperature regulator, the heater, the electronic flow meter, and the filter constitute the third-stage dilution device.

The first and third stage dilution devices mainly realize the dilution of the concentration of the flue gas flow and the heating of the metal pipe to ensure that the temperature of the incoming clean air is consistent with the temperature of the fresh flue gas flow. The dilution ratio of the first and third stages of dilution is determined by the flow rate of the electronic flowmeter and the detection requirements of cigarette smoke. For the gas requirements before entering the diluter, adjust the flow rate of the flowmeter to 1lpm~1.5lpm into the diluter; The temperature of the tubes is controlled by heaters and thermostats.

The airflow flowing out from the smoking machine (referred to as mixed gas G1), its flow setting cannot be changed at will, and the general detection range: 1lpm～2lpm. The solenoid valve in the smoking machine communicates with the ambient air, and is set to smoke once a minute, of which 2s are connected to the smoking machine for cigarette smoke collection, and 58s are switched to sucking ambient air, and the process is repeated until the cigarette samples are smoked. The first-stage dilution device is a clean air A filtered by an air inlet input filter. After the electronic flow meter adjusts the flow rate (about 1lpm~1.5lpm), it is connected by a three-way valve and output through the mixed gas output port (referred to as mixed gas) G2) to the second stage dilution device. The clean air flowing out of the electronic flowmeter is sent to a metal pipe, and the heater is controlled by the temperature regulator to heat the metal pipe to adjust the temperature of the air entering the metal pipe, reduce the temperature difference between the clean air and the fresh flue gas, and reduce the temperature difference caused by the mixed gas. Losses caused by condensation on the gas pipe walls.

The mixed gas G2 entering the second-stage dilution device is diluted by the diluter and is referred to as the mixed gas G3 (flow rate is 0.5lpm~5lpm), and is output to the third-stage dilution device, and is diluted again through the third-stage dilution device. The temperature-adjusted air intake device heats the incoming clean air, dilutes it into a mixed gas G4, and finally ensures that the flow rate of the mixed gas G4 is 10lpm-40lpm, and enters the aerosol particle size spectrometer for detection.

Fig. 2 shows the results of smoke detection in the prior art, the detection dynamic stability is poor, the noise level is high, and the reproducibility is poor.

Select cigarette samples to test the smoke by smoking cigarettes through a smoking machine, and use the existing aerosol particle size spectrometer to directly measure the particle size distribution of the smoke aerosol. However, when using an aerosol particle size spectrometer to measure the smoke of a cigarette sample, because the aerosol concentration in the cigarette smoke is much higher than that in the air, it is easy to cause aerosol particles The spectrometer is severely overloaded. The diluter provided with the particle size spectrometer is used to dilute the cigarette smoke and then detect the aerosol particle size. The input smoke sample gas concentration is too high, and the tar in the smoke is easy to stick to the detection instrument. , It is easy to cause the instrument to be blocked, the internal pressure is too large, the flow rate is unstable, and the cleaning is difficult (the results are shown in Figure 2).

Fig. 3 shows the result of the detection of the utility model without temperature regulation. If the temperature regulators, heaters and metal pipes in the first and third stage dilution devices are not used in Example 2, the temperature of the clean air entering the flowmeter will be lower than the temperature of the fresh flue gas, resulting in a temperature difference, resulting in The mixed smoke condenses on the connecting pipe wall, and errors occur when the aerosol particle size spectrometer collects data, which affects the detection results of cigarette smoke aerosols. The detection is not stable enough, and the reproducibility is not ideal.

Fig. 4 has shown the result that the utility model detects. Obviously the results are stable and reproducible.

Claims (1)

1. A real-time detection device for cigarette smoke aerosol particle size distribution, comprising a smoking machine (1), a diluter (2), an aerosol particle size spectrometer (3), and a temperature regulator (4), characterized in that: The smoking machine (1) is connected to the diluter (2) by the metal pipe (8) through the electromagnetic valve (9), and the other end of the diluter (2) is connected to the aerosol particle size spectrometer (3) through the metal pipe (8). ), the diluter (2) is provided with an exhaust gas outlet (G); the smoking machine (1) and the diluter (2), the diluter (2) and the aerosol particle size spectrometer (3) are respectively passed through metal pipes (8) communicate with the heater (5), the heater (5) is controlled by the temperature regulator (4), and the heater (5) communicates with the electronic flow meter (6) and the filter (7) successively.

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