Three-rotor pulseless volumetric flow meter

Abstract

The invention provides a three-rotor gas volumetric flow meter which comprises a shell and a pulse generator arranged on an end cover of the shell. The meter further comprises two metering rotors anda balance rotor which are arranged in a measuring chamber in a shell, and a rotating shaft penetrates through the metering rotors and the balance rotor. The two ends of the rotating shaft abut againstand are fixed to the inner side faces of a front shell end cover and a rear shell end cover respectively, the longitudinal section of the metering rotor is H-shaped, the balance rotor is provided with a plurality of driving blades, the middle of the balance rotor is of a cylindrical structure, and the balance rotor and the metering rotors are periodically sealed and attached during rotation. TheI-shaped metering rotors are periodically attached to the introduced balance rotor in a sealed mode, the balance rotor is matched with the metering rotors to rotate together, the airflow flows more stably, balloon pulsation is effectively reduced, and equipment stability is improved.

Description

Technical field[0001]The invention relates to the field of measurement and calibration of a gas positive displacement flowmeter, in particular to a three-rotor non-pulsation positive displacement flowmeter.Background technique[0002]The gas volumetric flowmeter is a Roots flowmeter, also known as a waist wheel flowmeter. The rotor in the flowmeter is in the shape of a waist wheel, which rotates under the action of liquid pressure. Each time the rotor rotates 180°, a fixed volume of gas enclosed between the housing and the rotor is discharged. A counter connected to the rotor shaft records the number of rotations of the rotor or generates The flow rate is proportional to the pulse output electrical signal to measure the instantaneous and cumulative gas flow rate.[0003]Existing Roots flowmeters still have some problems. Normally, the number of metering rotors of the flowmeter is one to two, which causes the gas discharged by the flowmeter to be a mass of masses, which causes violent vi...

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Problems solved by technology

[0003] There are still some problems in the existing Roots flowmeter. Usually, the number of metering rotors of the flowmeter is 1 to 2, which causes the gas discharged from the flowmeter to be in groups, causing severe vibration when the flow is working, and There is a "chug" sound, and the vibration and noise are large, which is also the reason for the pulsating flow, so the pulsating flow generated by the conventional 2-rotor flowmeter cannot be eliminated

[0004] In addition, some high-value instruments use a design of 2 pairs of 4 rotors. The design is to eliminate the pulsating flow of the flowmeter. By adjusting the exhaust time difference between the rotors, the air masses will cancel each other out when they are discharged, greatly reducing the flow rate. However, even a 2-to-4 rotameter cannot completely eliminate the pulsation, and it has the disadvantages of high cost and large volume

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