CN201203566Y - A cigarette smoke airflow adjustment system for aerosol detection - Google Patents

Abstract

The utility model discloses a cigarette smoke gas flow regulating system for aerosol detection. The smoke gas flow flowing out from a cigarette smoke generating device flows through a first-stage dilution device, a second-stage dilution device and a diversion device in sequence. By improving the gas path connection design between the smoke generating device and the aerosol detection equipment, adding auxiliary gas dilution devices and waste discharge devices, and setting appropriate airflow speeds, etc., adjust and ensure cigarette burning and smoking when collecting smoke aerosol samples It meets the requirements, and the concentration of the sample entering the detector is within the effective detection range of the equipment, so as to ensure the feasibility and accuracy of cigarette smoke aerosol detection.

Description

A cigarette smoke airflow adjustment system for aerosol detection

technical field

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

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 For higher concentrations, connect an axial diluter 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 airflow regulating system for aerosol detection.

The technical solution of the utility model is to provide a cigarette smoke flow regulating system for aerosol detection, the smoke flow flowing out from the cigarette smoke generating device flows through the three-stage smoke flow regulating system in turn and then enters the For an aerosol detection instrument, the three-stage flue gas flow regulation system includes a first-stage dilution device, a second-stage dilution device, and a flow splitting device connected in sequence through a gas pipeline.

The first stage dilution device includes a compressed air intake pipe, a pressure regulating device and an axial diluter.

The second-stage dilution device includes a compressed air intake pipe, a pressure regulating device and an axial diluter.

The flow diversion device includes a three-way valve and an auxiliary suction source.

The auxiliary suction source includes a suction source and a pressure regulating device or an adjustable speed suction source

The pressure regulating device is a pressure regulating valve.

The pressure regulating device is a pressure regulating valve and a flow meter.

In the proposal of the utility model, the first-stage dilution uses clean compressed air to dilute the flue gas flow to adjust the flue gas flow rate, and the dilution factor is 10 to 30 times. The dilution factor of the second stage dilution is 5-20 times. With the three-stage adjustment device in this connection sequence, the efficiency of the auxiliary suction source can be 100mL/min-400mL/min.

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 adjustment is mainly used to rapidly dilute the concentration of the sample flow to avoid blockage of the aerosol flow pipeline. At the same time, ensure that the flow rate of the sample stream 1 meets the detection requirements. The dilution factor is set at 10 to 30 times, which is mainly adjusted according to the requirements of cigarette testing.

The second-stage dilution adjustment mainly ensures that the concentration of flue gas aerosol and the stability of the state of aerosol particles meet the requirements of the aerosol detector. The dilution factor is 5 to 20 times, which is mainly adjusted according to the amount of aerosol released during the smoking process of the tested cigarette sample and the effective detection range of the aerosol detector.

The auxiliary suction source adopts a device with a stable flow rate control function, and the working efficiency is required to reach 100mL/min~400mL/min. Its function is to ensure that the flow rate of the sample stream 4 meets the set value of the aerosol detector.

The beneficial effects of the utility model are: by improving the design of the gas path connection between the smoke generating device and the aerosol detection equipment, by adding an auxiliary gas dilution device and a waste discharge device, and setting a suitable air flow speed, the collection of smoke can be adjusted and ensured. When the aerosol sample is smoked, the cigarette smoking meets the requirements, and the concentration of the sample entering the detector is within the effective detection range of the device.

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 schematic diagram of system structure of the utility model 3

Fig. 6 The utility model detects the detection result of cigarette smoke aerosol content

Detailed ways

The utility model will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Example 1

Randomly select a domestic brand of cigarettes and use an aerosol detection instrument to directly connect with the smoke generating device. See Attached Figure 1 for the effect diagram of the detection overload of the aerosol detector, and Attached Figure 2 for the test results.

Example 2

A cigarette smoke flow adjustment system for aerosol detection provided by the utility model is shown in Fig. Aerosol detection equipment.

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 three-stage flue gas flow regulating system includes a first-stage dilution device, a second-stage dilution device and a flow splitting device connected in sequence through gas pipelines.

The first-stage dilution device includes a compressed air intake pipe, a pressure regulating valve and an axial diluter. The flue gas sample flow 1 flowing out of the solenoid valve enters the axial diluter, and the clean compressed air enters the axial diluter through the pressure regulating valve as the auxiliary air 1, and the concentration of the sample flow is rapidly diluted by adjusting the flow rate of the clean compressed air to avoid contamination Aerosol flow line is clogged. At the same time, ensure that the flow rate of the sample stream 1 meets the detection requirements. The dilution factor is set at 10 to 30 times and adjusted according to the requirements of cigarette testing.

The flue gas sample flow 2 adjusted by the first-stage dilution enters the axial diluter of the second-stage dilution device, and the auxiliary gas 2 (clean compressed air) enters the axial diluter from the inlet pipe through the pressure regulating valve. By adjusting the flow of clean compressed air to adjust the flue gas flow, the concentration of flue gas aerosol and the stability of the state of aerosol particles meet the requirements of the aerosol detector. The dilution factor is 5 to 20 times, which is mainly adjusted according to the amount of aerosol released during the smoking process of the tested cigarette sample and the effective detection range of the aerosol detector.

The sample flow 3 after the second-stage adjustment is then divided to obtain the sample flow 4 for aerosol detection. A three-way valve is set for split flow regulation, one outlet of the three-way valve is connected to the aerosol detection instrument, the other outlet is connected to the pressure regulating valve, and the pressure regulating valve is connected to the suction source, by setting the first-stage dilution device and the second-stage dilution device Adjustment, the working efficiency of the auxiliary suction source is required to reach 100mL/min-400mL/min, which can ensure that the flow rate of the sample flow 4 entering the aerosol detection instrument meets the set value of the aerosol detector. The result of using the system of the utility model to measure the same cigarette as in Example 1 is shown in Figure 6.

Example 3

The cigarette smoke flow adjustment system for aerosol detection provided by the utility model is shown in Figure 4. The smoke flow flowing out from the cigarette smoke generating device flows through the three-stage smoke flow adjustment system in turn and then enters the Aerosol detection equipment. The flue gas generating device is the same as in Example 2.

The three-stage flue gas flow regulating system includes a first-stage dilution device, a second-stage dilution device and a flow splitting device connected in sequence through gas pipelines. The connection mode of the regulating devices at all levels is the same as that in Embodiment 2, the difference is that the pressure regulating device includes a pressure regulating valve and a flow meter, and a flow meter is connected between the pressure regulating valve and the axial diluter, which can control the auxiliary gas more conveniently and intuitively. flow.

Example 4

See Figure 5 for the adjustment system of the cigarette smoke flow for aerosol detection. The way of connecting the flue gas generating device and the regulating devices at all levels is the same as that in Embodiment 3, the difference is that the auxiliary suction source can directly select a speed-adjustable suction source.

Claims (9)

1, a kind of gasoloid detects the regulating system with the cigarette smoke air-flow, the flue gas stream that flows out from the cigarette smoke generating means is flowed through successively and is entered the gasoloid detecting instrument after the flue gas stream regulating system of three grades of settings, it is characterized in that the flue gas stream regulating system of described three grades of settings comprises first order air mix facilities, second level air mix facilities and the part flow arrangement that connects successively by gas pipeline.

2, detect the regulating system of using the cigarette smoke air-flow according to the described gasoloid of claim 1, it is characterized in that described first order air mix facilities comprises compressed air inlet pipe, regulator and axial diluter.

3, detect the regulating system of using the cigarette smoke air-flow according to the described gasoloid of claim 1, it is characterized in that described second level air mix facilities comprises compressed air inlet pipe, regulator and axial diluter.

4, detect the regulating system of using the cigarette smoke air-flow according to the described gasoloid of claim 1, it is characterized in that described part flow arrangement comprises T-valve and auxiliary suction source.

5, detect the regulating system of using the cigarette smoke air-flow according to the described gasoloid of claim 4, it is characterized in that described auxiliary suction source comprises suction source and regulator.

6, detect the regulating system of using the cigarette smoke air-flow according to the described gasoloid of claim 4, it is characterized in that described auxiliary suction source is the adjustable speed suction source.

7, detect the regulating system of using the cigarette smoke air-flow according to the described gasoloid of claim 4, the usefulness that it is characterized in that described auxiliary suction source is 100mL/min～400mL/min.

8, detect regulating system according to claim 2,3 or 5 described gasoloids, it is characterized in that described regulator is a pressure regulator valve with the cigarette smoke air-flow.

9, detect regulating system according to claim 2,3 or 5 described gasoloids, it is characterized in that described regulator is pressure regulator valve and flowmeter with the cigarette smoke air-flow.

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