Roots flowmeter model | What type of meter should be used for industrial gas with a flow rate of over 1000 cubic meters per hour

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What is a gas Roots flowmeter?

The Roots flowmeter uses mechanical measuring elements to continuously divide the fluid into individual known volume parts, and measures the total flow volume based on the number of times the measuring chamber sequentially and repeatedly fills and discharges that volume part of the fluid.. When the measured fluid flows through the flowmeter, the dynamic pressure of the fluid creates a differential pressure between the inlet and outlet, which drives the waist wheel to rotate. When the fluid pushes the waist wheel on the D2 axis to rotate counterclockwise, as shown in Figure 1A, the driving gear connected to it drives the waist wheel on the D1 uranium to rotate clockwise for 90 degrees, resulting in the state shown in Figure 1C. The upper waist wheel is pushed clockwise by the fluid, and the driving gear drives the lower waist wheel to rotate counterclockwise. When the waist wheel rotates 360 degrees, four times the effective volume of the measuring chamber is discharged from the flowmeter. In this way, the two waist wheels exchange driving rotation, and as the waist wheels rotate, the fluid is continuously discharged from the flow meter through the measuring chamber. The volume of fluid discharged by the waist wheel per revolution is a fixed value, which is proportional to the number of revolutions of the waist wheel shaft. Through the waist wheel shaft and other transmission mechanisms, the number of rotations is reduced and transmitted to the accumulation display part. It is precisely the working principle of the waist wheel flowmeter that determines that as long as the internal clearance design and assembly of the measuring chamber are reasonable, this flowmeter will have

2. What is the working principle of the waist wheel flowmeter? The waist wheel flowmeter, also known as the Roots flowmeter, works based on one or two pairs of waist wheels that can rotate tangentially. Its internal structure includes a measuring chamber, which is composed of the outer edge of the waist wheel and the inner wall of the shell, forming a "bucket" space with a fixed volume. When the fluid passes through under the pressure difference, the waist wheel will rotate in the positive direction. The working process of the waist wheel can be divided into four stages: firstly, the waist wheel Q1 acts as the driving wheel, pushing Q2 to rotate and discharge the fluid from the measuring chamber; Continuing with the grip width, Q2 becomes the driving wheel and the above process is repeated. Each waist wheel rotates 180 degrees to complete one measurement. By measuring the number of rotations of the waist wheel and the volume of the measuring chamber, the fluid volume can be calculated. The waist wheel flowmeter is suitable for measuring clean liquids, especially oil products, with high accuracy, up to 0.1-0.5 levels. Although its main disadvantages are large size, high pressure loss, and vibration, Pibi can significantly reduce vibration and noise during operation by using two pairs of waist wheel structures at a 45 degree angle. This flowmeter is widely used in the fields of petrochemica

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