Adjustable isokinetic sampling system

Abstract

The invention relates to an adjustable constant speed sampling system, which includes a cabin plate, a bracket fixed below the cabin plate, a constant speed sampling device mounted on the bracket, a main sampling pipe communicated with the constant speed sampling device, and a particulate matter monitoring sampler communicated with a constant speed pipe. The main sampling pipe is composed of a plurality of pipe sections that are equipped with constant speed sampling joints, and the constant speed sampling joints are connected to the particulate matter monitoring sampler through a multi-branch pipe. The vertical pipe of the constant speed pipe passes through the bracket and is mounted on the bracket by a mounting base. A first motor on the bracket drives the vertical pipe to rotate around the axis of itself. A second motor on the cabin plate drives the vertical pipe to swing around the straight line where the intersection point of the mounting base and the vertical pipe. In the flying process of an aircraft, the position and angle of the horizontal pipe of the constant speed pipe can be adjusted to make the horizontal pipe over against an air flow according to pressure taps' (pairwise symmetry) static pressure measured by a speed measurement pipe, and the internal pressure can be adjusted by a regulating device, thus ensuring the accuracy of value measured by the sampling device.

Description

technical field [0001] The invention relates to a sampling device, in particular to a particle constant velocity sampling device. Background technique [0002] At present, extreme pollution weather occurs frequently, and particle pollution has attracted public attention. The government has also introduced a series of policies to control particle pollution. In order to do comparative research with ground monitoring data, aerial surveys are needed, but the current aerial surveys of PM 2.5 and PM 10 It is usually collected by a sampler installed on the aircraft, and the isokinetic tube in the existing sampler usually does not have an adjustment mechanism, so the port of the isokinetic tube cannot be directly facing the airflow, and often forms an included angle with the airflow. As a result, the intake volume of the isokinetic tube cannot reach the maximum, and the measured particle size spectrum distribution and particle concentration are not uniform, which directly affects ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the invention of this application is to solve the problem that the position of the main sampling tube in the current sampler cannot be adjusted and the air pressure inside the sampling device is unstable, and to provide an adjustable constant velocity sampling system

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