Piston-type constant-pressure controllable airflow source flow measurement device

Abstract

The invention discloses a piston-type constant-pressure controllable airflow source flow measurement device. The piston-type constant-pressure controllable airflow source flow measurement device is characterized in that the measurement device comprises a linear movement suction system, a measurement test unit and a controller for controlling the suction system and the measurement test unit; the linear movement system is composed of four groups of piston cylinders, screws connected to four piston rods, and a servo motor for driving the screws to rotate, and the measurement test unit comprises a work interface arranged on an air outlet at the front end of each piston cylinder, a work electromagnetic valve, a measurement electromagnetic valve, a standard appliance fixture, a fixture interface and a flow measurement unit. According to the invention, a standard appliance of cigarette paper permeability can be metered; the application is simple and convenient, and experiment research work under different set differential pressure conditions can be achieved in the research field of special equipment of a tobacco laboratory. The device can finish operation through automatic control program set by the controller and improve the detection efficiency and accuracy.

Description

[0001] technical field [0002] The invention belongs to the field of tobacco instrument standard instrument verification, specifically, relates to a piston-type constant pressure controllable airflow source measuring flow device used for the verification or research of cigarette paper air permeability standard instrument, and a cigarette paper air permeability standard instrument It is used to calibrate relevant cigarette paper testing instruments, so that the measuring and testing instruments can reach normal working conditions. Each standard instrument corresponds to a gradient value of related parameters. Standard instruments for measurement. Background technique [0003] When verifying the air permeability standard appliance of cigarette paper, the air flow passes through the measuring circuit, and the airflow flow is controlled by throttling in the circuit, and the flowmeter is connected in series in the air circuit for monitoring. When the difference reaches a stable...

AI Technical Summary

Problems solved by technology

In practical applications, the following situations will occur. 1. It is very difficult to manually adjust the throttle valve and stabilize the pressure difference within a very small fluctuation range.

2. For the positive pressure air permeability standard device with large flow rate, the compressed air is consumed quickly during measurement, which causes the air flow and pressure in the circuit to change rapidly, and the air permeability standard device cannot be stabilized under the measurement conditions.

Cause large fluctuations in measurement results

3. When measuring the large-flow negative pressure air permeability standard device, the compressed air required by the negative pressure generator is consumed more and faster, and the flow and pressure in the circuit will also change rapidly and fluctuate greatly.

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