Elevation-type cigarette side-stream smoke aerosol rapid collecting hood and detection method thereof

Abstract

The invention relates to an elevation-type cigarette side-stream smoke aerosol rapid collecting hood and a detection method thereof. The elevation-type cigarette side-stream smoke aerosol rapid collecting hood comprises a collecting hood body, an electric elevation table and a base support, which are successively connected from top to bottom; the collecting hood body comprises a cylindrical hood body with an air inlet and a funnel hood body connected to the upper end of the cylindrical hood body in a sealing manner; the upper end of the funnel hood body is provided with a funnel hood body exhaustion pipe, the outer side of the funnel hood body exhaustion pipe is sleeved with a pre-dilution casing pipe, the bottom end of the pre-dilution casing pipe is fixed to the outer surface of the funnel hood body in a sealing manner, and the bottom is provided with a pre-dilution air inlet; the base support is fixedly provided with a smoke suction pipeline coaxially arranged with the collecting hood body; the smoke suction pipeline penetrates through the electric elevation table and a central hole of a bottom end cover of the cylindrical hood body and is connected with a smoke suction machine; a cigarette is fixed to the smoke suction pipeline by virtue of a cigarette clamping device and coaxially and vertically installed; and the electric elevation table is used for driving the collecting hood body to integrally move downwards, a descending speed is equal to a smoldering rate of the cigarette, and a distance from a cigarette burning cone to the inlet of the funnel hood body exhaustion pipe is ensured to be 15 to 20 mm.

Description

technical field [0001] The invention relates to the technical field of cigarette research, in particular to a lifting type cigarette sidestream smoke aerosol rapid collection cover and a detection method thereof. Background technique [0002] Cigarette combustion includes two combustion states, that is, the smoking process and the smoldering process. The smoking process will form mainstream smoke aerosol from the end of the cigarette, while the smoldering process will generate a large amount of sidestream smoke aerosol near the cigarette burning cone. The smoldering process is similar. [0003] After a series of mixing and aging processes, mainstream smoke and sidestream smoke will form ambient smoke, resulting in a decline in indoor air quality. In addition, the impact of smoking on human health has always been a research hotspot in the medical field. As far as the cigarette production industry is concerned, it is also one of the goals pursued by the cigarette industry t...

AI Technical Summary

Problems solved by technology

[0006] However, since the common size of the fishtail cover is: the bottom rectangular opening size is 100mm×20mm, after the diameter is changed, the inner diameter of the slender cylindrical exhaust pipe is 30mm, the inner surface area of ​​this structure is relatively large, which increases the particles and the wall surface of the fishtail cover. The chance of collision contact

In addition, since the cigarettes are placed horizontally at the bottom of the fishtail hood at about 15-20mm, the direction of the air flow of the sidestream smoke formed is vertically upward, perpendicular to the horizontal direction of the cigarettes, resulting in sidestream smoke The sol is very easy to collide with the wall and cause loss

[0007] In the actual detection process, the following problems must be paid attention to when using this fishtail structure and cigarette arrangement: 1. The ambient air must have high flow stability, and no large airflow disturbance is allowed, otherwise the sidestream smoke generated by horizontally placed cigarettes The flow line is disordered, and it is easy to escape from the bottom of the fishtail hood; 2. In addition, since the lower part of the fishtail hood adopts an open structure, it is necessary to ensure that the ambient air has a high degree of cleanliness during the test to prevent the particles in the ambient air from affecting the detection. 3. Since the ambient air flow rate near the cigarette is generally controlled at 200±30mm / s according to the standard requirements, the area of ​​the rectangular opening at the bottom of the fishtail cover is 100mm×20mm=2000mm 2 , then the air flow in the cover is constant, according to the flow rate = cross-sectional flow velocity × cross-sectional area, the flow rate is 24L / min, the air flow rate is relatively large, and the control is difficult

And the length of the slender exhaust pipe of the fishtail hood is about 400mm, and the inner diameter is about 20mm, then the flow time of the particles in the fishtail hood = the length of the exhaust pipe / flow velocity, and the flow time is about 1.25s, which is relatively long and extremely It is easy to cause particles to adhere and age, resulting in detection errors; 4. In addition, the wall temperature of the fishtail hood is low, which makes the sidestream smoke particles easy to condense on the wall; 5. Due to the design limitations of current commercial smoking machines, In the actual test, the cigarette is usually placed horizontally. Since the length of the cigarette is gradually shortened, it is necessary to move the fishtail hood so that the generated sidestream smoke aerosol streamline can pass through the central axis of the fishtail hood in time, otherwise it will easily lead to particulate matter. 6. Due to the high concentration of sidestream smoke aerosol particles, direct high-concentration detection may lead to serious condensation and agglomeration of particles in the pipeline, and the particle detection instrument is overloaded. etc., resulting in a large detection error

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