One-step ventilation rate standard rod period verification device and verification method therefor

Abstract

The invention discloses a one-step ventilation rate standard rod period verification device and a verification method. The period verification device comprises a quantitative negative pressure device,a clamp, a first differential pressure sensor, a second differential pressure sensor, a third differential pressure sensor, a first flow sensor, and a second flow sensor. The clamp is provided with afirst air inlet, an air outlet, and a second air inlet; the first flow sensor is connected in series between an air inlet end of the quantitative negative pressure device and an air outlet end of theclamp; the first differential pressure sensor and the second differential pressure sensor are respectively connected to an air outlet end and an air inlet end of the first flow sensor; the second airinlet is connected to the second flow sensor; the second differential pressure sensor is connected in parallel between the first air inlet and the second air inlet; the second flow sensor is connected to the second air inlet of the clamp; and the third differential pressure sensor is connected to an air outlet end of the second flow sensor. Two flow sensors are used as standards to measure totalflow and ventilation flow of the standard rod respectively, and to measure the standard rod value in one step.

Description

technical field [0001] The invention belongs to the technical field of calibration of standard parts of cigarette testing instruments, and in particular relates to a one-step ventilation rate standard bar checking device and checking method. Background technique [0002] Cigarette ventilation rate includes filter tip ventilation rate, paper ventilation rate, and total ventilation rate. It is usually measured by cigarette ventilation rate tester and cigarette physical performance comprehensive test bench. Cigarette ventilation rate not only affects the internal quality of cigarette products, but also changes the smoke quality. parameter. The ventilation rate standard rod is a standard part used in the cigarette ventilation rate testing instrument. The ventilation rate standard rod determines the accuracy of the cigarette ventilation rate measurement data. It is calibrated once a year as required to ensure the traceability of the ventilation rate standard rod value. [0003] ...

AI Technical Summary

Problems solved by technology

[0004] At present, the tobacco industry generally uses a soap film flowmeter as a standard to verify the ventilation rate standard rod, but there is no corresponding standard device and verification method for period verification

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