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What is a gas Roots flowmeter?
The Roots flowmeter uses mechanical measuring elements to continuously divide the fluid into a single known volume of fluid, and measures the total flow volume based on the number of times the measuring chamber sequentially and repeatedly fills and discharges this volume of 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 connected driving gear drives the waist wheel on the D1 uranium to rotate clockwise. After 90 degrees of rotation, it becomes 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 of the Hui ethnic group 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, t
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2. Installation and piping requirements for Roots flow meters
① Uneven flow velocity distribution and the presence of secondary flow inside the pipe are important factors affecting the measurement accuracy of turbine flow meters. Therefore, turbine flow meters have fixed bend requirements for upstream and downstream straight pipe sections. For industrial measurement, a straight pipe length of 20D upstream and 5D downstream is generally required. To eliminate secondary flow, it is best to install a rectifier at the upstream end. If there is a straight pipe section of about 20D at the upstream end and a rectifier is installed, the measurement accuracy of the flow meter can reach the accuracy level of calibration.
. ② Turbine flow meters have high requirements for fluid cleanliness, and a filter must be installed in front of the flow meter to ensure the cleanliness of the fluid. A funnel-shaped filter can be used for durability, and its cleanliness can be measured by measuring the differential pressure changes at both ends. ③ To ensure that the liquid passing through the flowmeter is single-phase, that is, air or vapor cannot enter the flowmeter, a deaerator should be installed upstream of the flowmeter if necessary. For liquids that are prone to gasification, a certain back pressure must be ensured downstream of the flow meter. The size of the back pressure