What is mechanics: also known as classical mechanics, is a natural science that studies the deformation of an object of normal size under force and the motion process that is much slower than the speed of light. Mechanics is the foundation of physics, astronomy and many engineering. The rational design of machinery, architecture, spacecraft and ships must be based on classical mechanics. Mechanical movement is the most basic form of material movement. Mechanical motion, that is, mechanical motion, is the positional change of matter in time and space, including movement, rotation, flow, deformation, vibration, fluctuation, and diffusion. Balance or static is a special case. Other forms of material movement include thermal motion, electromagnetic motion, atoms and their internal motion, and chemical motion. Who knows the flowmeter of the mechanics principle? The instrument belonging to this principle has the differential pressure type and the rotor type using Bernoulli's theorem; the impulse type and the movable tube type using the momentum theorem; and the direct use of Newton's second law. Mass type; target type using fluid momentum principle; turbine type using angular momentum theorem; vortex type, vortex type using fluid oscillation principle; pitot tube type using total static pressure difference and volumetric type, å °, trough type, etc. . One of the mechanical flowmeters : differential pressure flowmeter: it has a wide range of applications, and various applications are applied in the flow measurement of closed pipelines, such as fluids: single phase, mixed phase, clean, dirty, viscous flow, etc. Working conditions: atmospheric pressure, high pressure, vacuum, normal temperature, high temperature, low temperature, etc.; pipe diameter: from a few mm to a few m; flow conditions: subsonic, sonic, pulsating flow. There are many types of differential pressure flowmeters. The differential pressure flowmeters that are often used on the market today are: orifice flowmeters, V-cone flowmeters, annubar flowmeters, powerbar flowmeters, toba tube flowmeters, bends. Pipe flowmeter, open channel flowmeter, etc. Mechanical Principles Flowmeter 2: Rotor-type flowmeter: It is a device that estimates the flow by measuring the position of a rotating component placed in a DC pipe. It is a type of variable area flowmeter. In a vertical cone tube which is enlarged from the bottom to the top, the gravity of the circular cross section of the float is received by the liquid power, and the float can freely rise and fall within the cone. It moves up and down under the action of flow velocity and buoyancy, and after balancing with the weight of the float, it is transmitted to the dial and indicated by the magnetic coupling. Generally divided into glass and metal rotameters. Mechanics Principle Flowmeter 3: Vortex Flowmeter: It inserts a columnar barrier vertically in the fluid pipe, and alternately generates vortices on both sides of the rear (relative to the fluid flow direction). As the fluid flows downstream to form a vortex column, we call it the Karman vortex street. We define the cylindrical barrier that produces the vortex as a vortex generator. Experiments have shown that the separation frequency of the vortex is linear with the flow velocity of the fluid under certain conditions. Thus, as long as the frequency of the vortex separation is detected, the flow rate or flow rate of the fluid in the pipe can be calculated. The fourth principle of mechanical flowmeter: vortex flowmeter: it is composed of vortex generator, detection probe and corresponding electronic circuit designed in the flow field. As the fluid flows through the vortex generator, two rows of vortices are formed on both sides of the vortex. This vortex is called the Karman vortex street. Based on the Karman vortex theory, Strohal proposed that the frequency of the Karman vortex street is proportional to the flow velocity of the fluid. The instrument adopts advanced differential technology, with isolation, shielding, filtering and other measures to overcome the problems of poor seismic resistance and small signal data disorder of similar products, and adopts unique sensor packaging technology and protective measures to ensure product reliability. . The product has two types: basic type and composite type. The basic type measures single flow signal; the composite type can measure temperature, pressure and flow simultaneously. Each type has an integral, split structure to accommodate different installation environments. As we all know, practices without correct theoretical guidance tend to be more blind, easy to detour, and often more than half the effort. Therefore, we must pay attention to the study of swimming theory knowledge, use the correct theory to guide our swimming practice, improve efficiency, and avoid detours. Article source:
Who knows the flowmeter of mechanics?
Who knows the flowmeter of mechanics? What is mechanics? Mechanics is an independent, fundamental subject that studies energy and force and their relationship to the balance, deformation, or motion of solids, liquids, and gases. Mechanics can be roughly divided into three parts: statics, kinematics and dynamics, the balance of static research forces or the static problem of objects; kinematics only considers how objects move, and does not discuss its relationship with the force; The relationship between exercise and stress. Modern mechanical experimental equipment, such as large wind tunnels and water tunnels, are themselves a comprehensive science and technology project that requires multi-disciplinary, multidisciplinary collaboration.