Orifice flow meter provided with linear resistance regulator

Abstract

The invention discloses an orifice flow meter provided with a linear resistance regulator. The orifice flow meter comprises the resistance regulator capable of linearly regulating the air resistance, an orifice assembly and a flow meter host. The linear resistance regulator solves a problem that a negative pressure regulating valve has difficulty in linearly regulating the resistance. An upper plate and a lower plate of the regulator are respectively provided with a through hole, and the air resistance between the two plates changes linearly as the relative rotation angle of the two plates changes linearly. A regulating ring is driven to rotate through an operation rod, and the regulating ring drives the upper plate to rotate relative to the lower plate through magnetic steel, so that the air resistance can change linearly, and the fluctuation range and regulation performance of the flow in a sampling port of an atmosphere device can be detected under conditions with different air resistances. Furthermore, the resistance regulator is arranged in the orifice flow meter, so that a flow calibration function and a flow regulation performance detection function can be achieved, and the number of instruments used for atmosphere device detection can be reduced. The orifice flow meter is simple in structure and low in production cost, is convenient to install and maintain, and is convenient to carry and operate.

Description

technical field [0001] The invention relates to an orifice flow meter for gas flow measurement, in particular to an orifice flow meter which is suitable for flow measurement of atmospheric equipment and has a linear resistance adjustment function, and belongs to the technical field of atmospheric equipment verification. Background technique [0002] At present, orifice flowmeters used for flow measurement, calibration, calibration, and verification of atmospheric equipment are widely used in dust, TSP, PM10, PM2.5, etc. sampling in the environmental protection industry due to their portability, easy installation, and direct calibration. Flow verification of atmospheric samplers in the field of detectors and environmental monitoring. [0003] Because the monitoring results of atmospheric samplers and other equipment directly reflect the environmental pollution index, as a flow verification calibration instrument on the upper level of the sampler, the accuracy and verification...

AI Technical Summary

Problems solved by technology

[0005] However, the negative pressure regulating valve connected between the orifice flowmeter and the atmospheric equipment for gas resistance adjustment function generally has difficult linear adjustment of gas resistance, complex structure, high production cost, high equipment maintenance cost, bulky and inconvenient installation. And other issues

In order to solve the problem that the gas resistance can be adjusted linearly, the patent (CN1176373C) "A Resistance Regulator" proposes a linear gas resistance adjustment device, which can realize continuous and uniform adjustment of the resistance, but it is difficult to manufacture and process, and it is inconvenient to install. Difficult to seal the structure

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