Problems with installing dampers on metal rotor flowmeters

Project Overview

In addition to metal rotor flowmeters, flowmeters commonly used in industry include differential pressure flowmeters, vortex flowmeters, electromagnetic flowmeters, ultrasonic flowmeters, turbine flowmeters, oval gear flowmeters, etc. For different measured fluids, different flow states and different measurement positions, each flow meter has its own advantages and disadvantages. For example, in situations with different flow rates, a variety of flow meters such as orifice plates and vortex meters can be used for flow measurement at medium and high flow rates, while metal float flowmeters play a very important role in flow measurement at lower flow rates and higher pressures. effect, especially at low Reynolds numbers.

When using a metal rotor flowmeter at a polysilicon production site, the instantaneous flow rate of the measurement medium is too small or unstable, the working pressure is low or unstable, the inner diameter of the measuring tubes before and after the flowmeter changes too much, and the straight pipe sections before and after the flowmeter are seriously damaged. It meets the usage requirements, especially when the measuring medium is gas, the medium flow in the flow meter measuring tube is extremely unstable, causing the float to jump. The vertical up and down linear motion of the float is transmitted through the magnetic coupling system and converted into the rotation operation of the pointer shaft. The pointer combined with the pointer shaft rotates to indicate the instantaneous flow of the medium. When the beating phenomenon of the float in the flow meter measuring tube is transmitted to the pointer, it turns into a continuous oscillation phenomenon of the pointer, causing the flow indication to be unstable, and even the scale value cannot be read at all to determine the instantaneous flow value.

If this phenomenon occurs on site, the usual treatment method is to analyze the main reason for the pointer swing. In most cases, measures are taken to improve medium flow conditions during polysilicon production, thereby reducing and avoiding pointer swing. However, in most cases, the frequency and amplitude of pointer swings are difficult to avoid and fundamentally reduced.