CN201130137Y - A New Cigarette Smoke Aerosol Detection System - Google Patents

Abstract

The utility model discloses a cigarette smoke aerosol detecting system, which comprises a cigarette smoke generating device, a first grade diluting device, a second grade diluting device and an aerosol detector which are connected in turn through gas pipes, wherein the first grade diluting device comprises a clean compressed air inlet and a pressure-adjusting device, a gas mixing diluter and an external suction source, the gas mixing diluter is provided with two gas inlets and two gas outlets, wherein one gas outlet is connected with the aerosol detector through the gas pipe, and the other gas outlet is connected with the external suction source. The second grade diluting device comprises a clean compressed air inlet, a pressure-adjusting device and an axial diluter. The detecting system realizes the detection for the cigarette smoke aerosol through improving the gas path connection design between the smoke generating device and the aerosol detecting devices, and can analyze the smoke aerosol conditions more accurately.

Description

A New Cigarette Smoke Aerosol Detection System

technical field

The utility model belongs to the technical field of detection, in particular to a detection system for cigarette smoke aerosol.

Background technique

In the prior art, the process of aerosol detectors used to measure aerosol particles in the air is: through the suction source device of the detector itself, usually with a stable flow rate of 10L/min-40L/min, the gas sample is sucked outward; when the sample When the concentration is high, an axial diluter can also be connected to dilute the sample.

When an aerosol detector is used to measure cigarette smoke, the detector is seriously overloaded because the aerosol concentration in the smoke is much higher than that in the air. When the detection results exceeded the detection limit of the instrument (4.0×10 ⁵ fA), there was no difference between the detection values, and all reached the maximum value, etc., the detection and analysis could not be carried out. Even if the sample dilution device provided by the manufacturer is used, it still cannot meet the requirements for samples with high tar content; for the detection of low-tar cigarette samples, pipeline blockage often occurs, and the pressure drop in the pipeline increases during the detection process. The gas flow rate changes drastically during the suction process, resulting in inconsistencies between the captured samples before and after.

In the cigarette smoke aerosol detection technology, there is a lack of a stable, adjustable gas flow rate and concentration adjustment system, so that the existing aerosol detector cannot be used to detect the aerosol content in cigarette smoke.

Utility model content

The purpose of the utility model is to fill up the gap in the prior art and provide a cigarette smoke aerosol detection system.

The purpose of this utility model is achieved by the following technical solutions:

A cigarette smoke aerosol detection system is provided, comprising a cigarette smoke generating device, a first-stage dilution device, a second-stage dilution device and an aerosol detector sequentially connected through a gas pipeline; the first-stage dilution device includes a clean compression The air inlet and its pressure regulating device, the gas mixing diluter and the external suction source, the gas mixing diluter is provided with two inlets and two gas outlets, one gas outlet is connected to the aerosol detector through the gas pipeline, The other air outlet is connected with an external suction source; the second-stage dilution device includes a clean compressed air inlet and its pressure regulating device and an axial diluter.

The pressure regulating device is a pressure regulating valve.

The pressure regulating device can also be a pressure regulating valve and a flow meter.

The sample air flow flowing into the aerosol detector, referred to as the sample flow 3, is limited by the existing conventional aerosol detector, and is usually a fixed value that cannot be adjusted. The value is generally 10L/min-40L/min.

The smoke generating device can be configured as a smoking machine and a solenoid valve. The flow rate of the airflow (sample flow 1) flowing out of the smoke generating device must be set in accordance with the requirements of cigarette testing and cannot be adjusted arbitrarily. According to different testing requirements, its value is between 1mL/min and 1.8mL/min. The solenoid valve can communicate with the ambient air, and it is set according to the cigarette detection requirements. Usually, it is connected to the smoking machine for smoking cigarettes for 2 seconds, and switched to sucking ambient air for 58 seconds, and it is repeated until the cigarette smoking is completed.

The first-stage dilution device mainly realizes the dilution of the flue gas flow concentration. The gas mixing diluter is connected to a suction source. The suction source adopts a device with a stable flow rate control function. The working efficiency ranges from 20mL/min to 40mL/min, which can ensure that the concentration of sample flow 2 is 10 to 40 times higher than that of sample flow 1. The dilution ratio of the first-stage dilution is determined by the efficiency of the suction source and the requirements of cigarette testing. For the setting where the efficiency of the suction source is 20mL/min and the gas flow rate sample flow 1 required for cigarette testing is 1mL/min, the dilution ratio is slightly greater than 20:1, within the range of 20:1 to 28:1.

The beneficial effects of the utility model are: by improving the design of the gas path connection between the flue gas generating device and the aerosol detection equipment, adding an auxiliary gas dilution device and a waste discharge device, and setting a suitable air flow speed, etc., to ensure the collection of flue gas. When the sol sample is burned and smoked, it meets the requirements, and the concentration of the sample entering the detector is within the effective detection range of the equipment.

The utility model realizes the detection of the aerosol of the cigarette smoke, and does not need to develop special aerosol detection equipment for the detection of the cigarette smoke. The detection effect is significantly improved, and a more accurate analysis of the smoke aerosol is realized.

Description of drawings

Figure 1 Effect diagram of aerosol detector instrument detecting overload

Figure 2 The detection results of directly using the aerosol detector to detect the aerosol content of cigarette smoke

Fig. 3 schematic diagram of system structure of the utility model 1

Fig. 4 schematic diagram of system structure of the utility model 2

Fig. 5 the detection result of the utility model detection cigarette smoke aerosol content

Detailed ways

Further illustrate the utility model below in conjunction with accompanying drawing and specific embodiment.

Example 1

Select the cigarette sample to produce smoke through the smoking machine, and use the existing aerosol detector to directly measure the aerosol content of the cigarette smoke flowing out of the smoking machine. The suction source device of the detector itself usually has a stable flow rate of 10L/min ~40L/min, the gas sample is sucked outward, but because the aerosol concentration in the flue gas is much higher than that in the air, the detector is seriously overloaded. The detection results exceeded the detection limit of the instrument (4.0×10 ⁵ fA), there was no difference between the detection values, and all reached the maximum value, etc. The results were shown in Figure 1, and detection and analysis could not be performed.

If the axial diluter provided by the manufacturer of the aerosol detector is used to dilute the cigarette smoke and then carry out aerosol detection, the pipeline is still often blocked, the pressure drop of the pipeline is getting larger and larger, and the air velocity is violent during the cigarette smoking process. Changes, resulting in inconsistencies in the samples captured before and after, the measurement results are shown in Figure 2.

Example 2

As shown in accompanying drawing 3, a kind of cigarette smoke aerosol detection system comprises the cigarette smoke generating device connected in sequence through the gas pipeline, the first stage dilution device, the second stage dilution device and the aerosol detector; Including a smoking machine and a solenoid valve, the first-stage dilution device includes a clean compressed air inlet, a pressure regulating valve, a gas mixing diluter and an external suction source, the gas mixing diluter is provided with two inlets and two outlets, One gas outlet is connected to an aerosol detector through a gas pipeline, and the other gas outlet is connected to an external suction source; the second-stage dilution device includes a clean compressed air inlet, a pressure regulating valve and an axial diluter.

Cigarettes produce smoke through the smoking machine, and the solenoid valve can be connected to the ambient air. It is set according to the cigarette detection requirements. Usually, it is connected to the smoking machine for 2 seconds to suck cigarettes, and 58 seconds to switch to sucking ambient air. Repeat until the cigarette is smoked. The gas mixing diluter is equipped with two inlets and two gas outlets, the cigarette smoke enters the gas mixing diluter through the solenoid valve, clean compressed air enters the gas mixing diluter through the pressure regulating valve, and the gas mixing diluter has one gas outlet It is connected to the second-stage dilution device through the gas pipeline, and the other gas outlet is connected to the external suction source. The suction source is a waste discharge device, and a device with a stable flow rate control function is used. The working efficiency is in the range of 20mL/min to 40mL/min. The flow rate of clean compressed air is adjusted by the pressure regulating valve and the adjustment of the external suction source is used to realize the concentration of the sample flow 2 The concentration of sample stream 1 is 10 to 40 times diluted, and the flow rate of sample stream 1 is in the range of 1mL/min to 1.8mL/min to ensure that the gas flow pipeline does not become blocked.

The mixed gas sample flow 2 flowing out from one of the gas outlets of the gas mixing diluter enters the axial diluter, and the clean compressed air enters the axial diluter through the pressure regulating valve, and the flow rate of the clean compressed air is adjusted through the pressure regulating valve to realize the cigarette smoke sample The flow concentration was diluted again by 5 to 20 times, and finally the flow rate of the sample flow 3 was ensured to be 10L/min to 40L/min, and the sample flow 3 entered the aerosol detector for detection. The detection results are shown in Figure 5.

Example 3

As shown in Figure 4, a cigarette smoke aerosol detection system includes a cigarette smoke generator, a first-stage dilution device, a second-stage dilution device, and an aerosol detector connected in sequence through a gas pipeline; the smoke generator Including smoking machine and electromagnetic valve, the first-stage dilution device includes clean compressed air inlet, pressure regulating valve, flow meter, gas mixing diluter and external suction source, the gas mixing diluter is provided with two inlets and two One gas outlet is connected to the aerosol detector through the gas pipeline, and the other gas outlet is connected to the external suction source; the second-stage dilution device includes a clean compressed air inlet, a pressure regulating valve, a flow meter and an axial diluter.

Cigarettes produce smoke through the smoking machine, and the solenoid valve can be connected to the ambient air. It is set according to the cigarette detection requirements. Usually, it is connected to the smoking machine for 2 seconds to suck cigarettes, and 58 seconds to switch to sucking ambient air. Repeat until the cigarette is smoked. The gas mixing diluter is equipped with two inlets and two gas outlets. The cigarette smoke enters the gas mixing diluter through the solenoid valve, and the clean compressed air enters the gas mixing diluter through a pressure regulating valve and a flow meter. The gas mixing diluter One gas outlet is connected to the second-stage dilution device through a gas pipeline, and the other gas outlet is connected to an external suction source. The suction source is a waste discharge device, which adopts a device with a stable flow rate control function. The working efficiency ranges from 20mL/min to 40mL/min. The flow rate of clean compressed air and the adjustment of the external suction source are adjusted through the pressure regulating valve and flowmeter to realize the sample. The concentration of stream 2 is 10 to 40 times diluted than that of sample stream 1, and the flow rate of sample stream 1 is in the range of 1mL/min to 1.8mL/min to ensure that the gas flow pipeline does not become blocked.

The mixed gas sample flow 2 flowing out from one of the gas outlets of the gas mixing diluter enters the axial diluter, and the clean compressed air enters the axial diluter through a pressure regulating valve and a flow meter, and the clean compressed air is adjusted through the pressure regulating valve and flow meter The flow rate realizes that the concentration of the cigarette smoke sample stream is diluted again by 5-20 times, and finally the flow rate of the sample stream 3 is guaranteed to be 10L/min-40L/min, and enters the aerosol detector for detection.

Claims (3)

1, a kind of new cigarette flue gas aerosol detection system is characterized in that comprising the cigarette smoke generating means, first order air mix facilities, second level air mix facilities and the gasoloid detector that connect successively by gas pipeline; Described first order air mix facilities comprises clean compressed air air intake opening and regulator, gas mixed diluting device and adds suction source, gas mixed diluting device is provided with two air intake openings and two gas outlets, a gas outlet is connected with aerosoloscope by gas pipeline, another gas outlet with add suction source and be connected; Second level air mix facilities comprises clean compressed air air intake opening and regulator and axial diluter.

2,, it is characterized in that described regulator is a pressure regulator valve according to the described cigarette flue gas aerosol detection system of claim 1.

3,, it is characterized in that described regulator is pressure regulator valve and flowmeter according to claim 1 or 2 described cigarette flue gas aerosol detection systems.

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