Suction resistance detection method and device based on mass flow method

Abstract

The invention discloses a suction resistance detection method and device based on a mass flow method, and the conception of the method is that the inherent conversion relation between the gas volume flow and the mass flow is utilized, the mass flow standard value is obtained through conversion through the air pressure and the temperature of a test object, and in the test process, the mass flow rate standard value is kept in the suction pipeline through the mass flow rate controller, and the gas pressure difference value in the pipeline is obtained according to the condition, so that suction resistance test data corresponding to the preset constant volume flow rate are obtained. In addition, the invention further provides a suction resistance detection device which is composed of a control component, and a cigarette clamping component provided with an air pressure probe and a temperature probe, a mass flow controller, a gas differential pressure gauge, a mass flow sensor and a negative pressure pump which are sequentially connected through a pipeline, so that a whole set of brand-new and reliable testing device is provided for the mass flow method. Therefore, according to the invention, a standard constant-current hole piece in a draw resistance test link is abandoned, so that the cost burden caused by the standard constant-current hole piece is avoided.

Description

Technical field [0001] The present invention relates to the field of tobacco processing, and more particularly to a method and apparatus for absorbers based on mass flow method. Background technique [0002] During the cigarette absorption measurement, it is conventionally used to generate standard constant flow hole members (for example, 17.5 ± 0.3 ml / s) (a nozzle standard member, which is referred to as CFO). The gas flows from the small nozzle of the standard constant flow hole member, into the tapered pipe, when the nozzle back pressure is lower than the threshold, the gas exhibits a constant flow, and no longer changes with the nozzle back pressure. [0003] However, with long-term use, dust causes the standard constant flow hole pore diameter to gradually decrease, resulting in a constant volume flow rate change; then, since the standard constant flow hole member is molded once, it is difficult to accurately ensure the gas volume. The flow rate is a preset constant volume...

AI Technical Summary

Problems solved by technology

[0003] However, with long-term use, dust will cause the pore diameter of the standard constant-flow orifice to gradually decrease, resulting in a change in the constant volume flow rate; moreover, because the standard constant-flow orifice is formed at one time during manufacture, it is difficult to accurately guarantee the gas volume The flow rate is a preset constant volume flow rate value (especially when the tolerance is relatively strict); in addition, the standard constant flow orifice is affected by external environmental conditions such as temperature, and the flow rate will also change, which will affect the measurement result of the suction resistance value

[0004] Due to the above reasons, the CFO is often unusable or has a short service life, and it is often necessary to re-purchase a new CFO

However, in order to ensure the accuracy and stability of metering performance, the standard constant flow orifice is generally made of materials with high rigidity, good friction resistance and low thermal conductivity, and requires precise design and processing, resulting in high cost In summary, the situation has brought huge cost consumption to tobacco companies

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