【A journey of a thousand miles begins with a single step – Centrifugal Pumps】1.1 Understanding basic concepts: What is a pump

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This post was last edited by 3983596_FPPZ on 2018-11-14 at 15:31. Concepts are the foundation of everything; a thorough understanding of them can **help in mastering formulas and theorems later on, as well as accelerating the development of professional skills. 1.1.1 What is a pump? In our work and daily life, we encounter many machines that act on fluids to meet our various needs, such as transportation, storage, mixing, sedimentation, blending, separation, purification, filtration, refinement, pressurization, vacuum creation, heating, and freezing. Definition of a pump: A pump is a machine that converts the energy of a prime mover into the energy of a liquid. Keywords: prime mover, liquid, energy ● Prime mover: A machine that provides the initial driving force, such as the electric motors and steam turbines that we commonly see. Any machine that can provide power (mechanical energy) to a pump is called a prime mover. For example: various types of DC and AC motors, steam recovery turbines. ●Liquids: Devices used to transport liquids are called pumps; of course, a slight mixture of gas and liquid can also be transported. Liquids are different from gases; devices used to transport gases are generally called fans or air compressors (air pumps). Both fall under the category of fluid machinery. ●Energy: The energy obtained by liquids is divided into three categories: the first is pressure energy, as pumps increase the pressure of the liquid ； The second is kinetic energy; the pump increases the flow rate of the liquid ； Third is potential energy, that is, the increase in the height of the liquid by the pump. Anything that increases the energy of a liquid in any aspect is called a pump. We will cover this in detail in a separate article on head. Dear sea friends, please do the exercises to see if you understand them (the answers will not be revealed; you can get the answers from your friends’ replies). After-class questions (multiple choice): Which of the following machines belong to pumps? A: Rural hand-operated water wells B: Turbines in hydroelectric power stations C: Blowers D: Turbines used for lifting water in ancient aqueducts (also known as water wheels) AD