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Essay On Hydraulic Machine

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Intorduction
1. Energy is described as the capacity to produce changes within system. Energy exists in many forms and can be used in natural processes, to provide service to society and performing mechanical work to operate machines. Energy can be transformed from one form to another using energy transformation process.
Hydraulic Pumps
2. Hydraulic pumps are a source of converting mechanical power into hydraulic energy. Hydraulic pumps are used in hydraulic machines to perform different types of work such as lift, lower, open, close or rotate components. When it operates, following functions are performed:
(a) Creates a vacuum at the pump inlet thus allowing atmospheric pressure to force reservoir liquid into suction port of pump.
(b) Secondly, …show more content…

These pumps use the principle of rotation for moving the fluid. The vacuum is created by the rotary motion which carries the liquid from pump inlet to the outlet. Air is removed in rotary type pumps naturally instead of eliminating it manually. However, if they operate at high speeds, the fluid will cause erosion as the clearance between the rotating pump and the outer edge is close to assist maintain slow and steady rotation. Rotary type pumps are further grouped in three main types:
(i) Gear Pumps. Gear pumps are the simplest type of rotary pumps, consisting of two gears laid out side-by-side with their teeth enmeshed. The gears turn away from each other, creating a current that traps fluid between the teeth on the gears and the outer casing, eventually releasing the fluid on the discharge side of the pump as the teeth mesh and go around again. Many small teeth maintain a constant flow of fluid, while fewer, larger teeth create a tendency for the pump to discharge fluids in short, pulsing surges. (ii) Screw Pumps. These pumps consist of two or three screws with opposing thread i.e one screw turns clockwise and the other counterclockwise. Each screw is mounted on a shaft having gears on them and run parallel to eachother. The turning of screws and consequently the shafts on which they are mounted, draws the fluid through the

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