CN201203567Y - Detection system of cigarette smoke aerosol - Google Patents

Abstract

The utility model discloses a cigarette smoke aerosol detection system, which comprises a smoke generating device connected through a gas pipeline, a first-stage dilution device, a second-stage dilution device and an aerosol detector, and the first-stage dilution device includes A compressed air inlet pipe and its pressure regulating device, a gas mixing diluter and an external suction source; the second stage dilution device includes a compressed air inlet pipe and its pressure regulating device and a Dekati Diluter diluter. The utility model designs an integral adjustment device for the gas mixing diluter and the external suction source, so as to ensure that the concentration of the sample entering the detector is within the effective detection range of the equipment, and the working efficiency of the waste discharge device can be 10mL/min～40mL/min scope.

Description

Detection system of cigarette smoke aerosol

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.

Through a large number of experimental studies, the applicant has found a system for obtaining the smoke flow suitable for the use of existing aerosol detectors, hoping to solve the problem of using existing aerosol detectors to detect the aerosol content in cigarette smoke problem.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art and provide a detection system for cigarette smoke aerosol.

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

A cigarette smoke aerosol detection system is provided, comprising a smoke generating device connected by a gas pipeline, a first-stage dilution device, a second-stage dilution device and an aerosol detector, and the first-stage dilution device includes a compressed air intake pipe and its pressure regulating device, gas mixing diluter and external suction source; the gas mixing diluter is provided with two air inlets and two air outlets, and the two air inlets are respectively connected with the smoke generating device and the compressed air inlet pipe 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 second-stage dilution device includes a compressed air inlet pipe and its pressure regulator device and Dekati Diluter.

The pressure regulating device is a pressure regulating valve, and can also be set as a pressure regulating valve and a flow meter.

The dilution ratio of Dekati Diluter diluter is 50:1～200:1. Usually, the flow rate of the inlet and outlet of the DekatiDiluter diluter is a fixed value for a certain type of diluter, which is the dilution ratio. According to the air flow setting of the utility model system, the dilution ratio of the Dekati Diluter diluter is selected to be 50:1 to 200:1, which can ensure that the flow rate of the sample stream 3 meets the requirements of the aerosol detector.

The sample airflow flowing into the aerosol detector is called sample flow 3. The airflow velocity is limited by the existing conventional aerosol detectors. It is usually a fixed value and 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 airflow flowing out of the smoke generating device is called sample flow 1. The flow rate must be set in accordance with the cigarette testing standards 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 adjusts the flow rate of the auxiliary gas 1, and the auxiliary gas 1 uses clean compressed air to quickly dilute the concentration of the sample flow 1 by 10 to 30 times, avoiding blockage of the aerosol circulation pipeline, and ensuring the sample flow 1. The flow rate meets the testing requirements.

The external suction source adopts a device with a stable flow rate control function, and its working efficiency in the system of the utility model is required to reach 10mL/min-40mL/min. The role of the external suction source is to ensure that the flow rate of the sample stream 2 meets the flow rate requirements of the inlet port of the Dekati Duiluter diluter by adjusting the flow rate of the exhaust gas 1.

The beneficial effect of the utility model is that the gas mixing diluter and the external suction source are designed as an integral adjustment device, so as to realize the purpose of dilution at all levels, ensure that the burning and smoking of cigarettes meet the requirements when collecting smoke aerosol samples, and the concentration of the samples entering the detector within the effective detection range of the device.

After the utility model is adopted, the aerosol particle size distribution of the cigarette smoke can be detected without developing special aerosol detection equipment for the detection of the cigarette smoke, and the detection result is accurate and stable.

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 is a schematic diagram of the system structure of the utility model

Fig. 4 the utility model system structure schematic diagram two

Figure 5 is a schematic diagram of the system structure of the utility model three

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 detection system for cigarette smoke aerosol is shown in accompanying drawing 3, including a smoke generating device connected by a gas pipeline, a first-stage dilution device, a second-stage dilution device and an aerosol detector, and the first-stage dilution device includes Compressed air inlet pipe and its pressure regulating device, gas mixing diluter and external suction source; the gas mixing diluter is provided with two air inlets and two air outlets, and the two air inlets are respectively connected with the smoke generating device and the The compressed air inlet pipe and its pressure regulating device are connected, one air outlet is connected to the second-stage dilution device through the gas pipeline, and the other air outlet is connected to an external suction source; the second-stage dilution device includes a compressed air inlet pipe And its pressure regulating device and Dekati Diluter diluter.

The smoke generating device can be configured as a smoking machine and a solenoid valve. The airflow flowing out of the smoke generating device is called sample flow 1. The flow rate must be set in accordance with the requirements of the cigarette testing standards 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 sample flow 1 flowing out of the flue gas generating device enters the gas mixer of the first-stage dilution device, and the flow rate of the clean compressed air auxiliary gas 1 is adjusted through the pressure regulating valve to realize rapid dilution of the concentration of the sample flow 1 by 10 to 30 times, avoiding contamination The aerosol circulation pipeline is blocked, and the flow rate of the sample stream 1 is guaranteed to meet the detection requirements.

One outlet of the gas mixer is connected to the second-stage dilution device, and the sample flow 2 flows into the second-stage diluter from the outlet; the other outlet is connected to an external suction source, and the external suction source adopts a device with a stable flow rate control function. In the system of the utility model, its working efficiency is required to reach 10mL/min-40mL/min, and the function of the external suction source is to ensure that the flow velocity of the sample flow 2 meets the flow velocity requirements of the air inlet of the Dekati Duiluter diluter by adjusting the flow velocity of the exhaust gas 1.

The sample flow 2 flows into the Dekati Diluter diluter, the second-stage dilution device. The dilution ratio of the Dekati Diluter diluter is 50:1 to 200:1, which can ensure that the flow rate of the sample flow 3 meets the requirements 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

A detection system for cigarette smoke aerosol is shown in accompanying drawing 4 and accompanying drawing 5, and the settings of the smoke generating device and the first-stage and second-stage dilution devices are basically the same as those in embodiment 2, the difference is as shown in accompanying drawing 4 The compressed air pressure regulating device in the first-stage dilution device of the connection method shown is a flow meter and a pressure regulating valve, and the external suction source is provided with a pressure regulating valve; The suction source adopts an adjustable speed suction source.

Claims (5)

1, a kind of cigarette flue gas aerosol detection system, comprise the flue gas generating means, first order air mix facilities, second level air mix facilities and the aerosoloscope that connect by gas pipeline, it is characterized in that described first order air mix facilities comprises compressed air inlet pipe and regulator, gas mixed diluting device and adds suction source; Described gas mixed diluting device is provided with two air intake openings and two gas outlets, two air intake openings are connected with compressed air inlet pipe and regulator thereof with the flue gas generating means respectively, a gas outlet is connected with second level air mix facilities by gas pipeline, another gas outlet with add suction source and be connected; Described second level air mix facilities comprises compressed air inlet pipe and regulator and DekatiDiluter diluter.

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

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

4,, it is characterized in that the described usefulness that adds suction source is 10mL/min～40mL/min according to the described cigarette flue gas aerosol detection system of claim 1.

5, cigarette flue gas aerosol detection system according to claim 1, the dilution ratio that it is characterized in that described Dekati Diluter diluter is 50:1～200:1.

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