FLUID DEVICES - HYDRAULIC PRESS, AIR LIFT PUMP, GEAR WHEEL PUMP

MECHANICAL TIPS AND STUDY MATERIAL

FLUID DEVICES

These are devices in which transmission of power takes  place by fluid as medium. The fluid medium may be liquid ( oil, water ) or gas. Based on fluid mechanics and fluid statics various devices are as under.

1 ) The hydraulic press

2 ) Air lift pump
3 ) Hydraulic ram
4 ) Gear wheel pump
5 ) Hydraulic accumulator

There are other devices also but in this section we will study in detail the above mentioned devices.


THE HYDRAULIC PRESS



It is device which is used to carry or lift heavy weight with small application of force. Intensity of pressure in static fluid is transmitted equally in every direction. This statement is pascal's law which applies in the case of hydraulic press.


The hydraulic press has two cylinders of different diameter. One diameter has plunger and other with ram. The plunger is one through which force is applied and ram is one which weight is kept which is to be lifted.


The section in between is filled with fluid through which pressure is transmitted.


When force "F" is applied on the plunger in download direction. This force is applied on fluid which in turn applied on ram, which moves the heavy weight placed above it.


Let,

W = weight to be lifted
F = Force applied on plunger
P = pressure produced by force "F".
A = area of ram
a = area of plunger

                       P =( F/a )•A


The ratio of weight lifted to force applied is called as mechanical advantage.

                       M.A = ( W/F )
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