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What are the disadvantages of volumetric flow meters?
Positive displacement flow meters have a complicated structure, large volume, and are bulky, especially for large caliber positive displacement flow meters, which are generally only suitable for small and medium-sized diameters. Compared with other types of general flow meters (such as differential pressure, float type, electromagnetic type), volumetric flow meters have greater limitations in the type of measured medium, medium operating conditions (temperature, pressure), and orifice diameter. Due to issues such as thermal expansion and deformation of parts at high temperatures, and material brittleness at low temperatures, volumetric flow meters are generally not suitable for high and low temperature applications. At present, the temperature range that can be used is approximately -30~160 ℃, and the maximum pressure is 10Mpa. 3/5 Most volumetric flow meters are only suitable for clean single-phase fluids. When there are particles or dirt, filters need to be installed upstream, which increases pressure loss and maintenance work; If measuring liquids containing gas, a gas separator must be installed. The safety of 4/5 volumetric flow meters is poor. If the detection moving parts get stuck, the fluid cannot pass through and the cut-off pipe system cannot be applied. However, some structural designs (such as the waist wheel flowmeter of Huaian Senling Instrument Co., Ltd.) can have a bypass built into the housing, allowing fluid to pass through the bypass when the active component is stuck. Partial displacement flow meters in the form of 5/5 (such as elliptical gear type, waist wheel type, rotary piston type, etc.) can cause pulsation in the flow during the
2. Working principle of Roots flowmeter?
Working principle of Roots flowmeter: Roots flowmeter, also known as waist wheel flowmeter, is a volumetric flowmeter mainly used for continuous or intermittent measurement of flow in pipelines, especially suitable for measuring the flow of large-diameter gases, nanoliquids, and steam medium fluids in industrial pipelines.. The core working principle is as follows: there is a measuring chamber hole inside the housing of the Roots flowmeter, and a pair of waist wheels (also known as rotors) that can rotate tangentially are installed inside the measuring chamber. These two waist wheels mesh with each other through a pair of coaxial transmission gears installed outside the flowmeter housing, thus achieving mutual linkage. When a fluid passes through the flowmeter, the two waist wheels will rotate in the positive direction under the action of the differential pressure of the fluid at the inlet and outlet of the flowmeter. As the waist wheel rotates, the liquid in the measuring chamber continuously flows in and out. By accurately measuring the volume of the measuring chamber and the number of rotations of the waist wheel, the fluid flow rate can be accurately calculated. Schematic diagram of working principle: (Note: The diagram shows the internal structure and working principle of the Roots flowmeter. The waist wheel rotates under the action of fluid differential pressure, thereby achieving flow measurement.) The advantages of the Roots flowmeter are significant, including high reliability: the Roots flowmeter can be treated with magnetic shielding