Miscellaneous Hydraulic Machine Prepared by : Shankar mayank 130360119093 Snjaybhai rajguru college of enginering , rajkot

In this chapter following machine are discussed Introduction The function of this machine is to store the energy and to transmit it through an incompressible fluid like water or oil. In this chapter following machine are discussed Hydraulic accumulator Hydraulic ram Hydraulic intensifier Hydraulic jack Hydraulic press Fluid coupling Hydraulic crane Torque converter Hydraulic lift

Simple hydraulic accumulator

Hydraulic accumulator Which store or accumulate the energy of fluid under pressure when it is not needed and supplies the energy when need arises. It works like a fly wheel of an engine, electric storage batteries. In descending position of ram no energy is required. It takes a more time to put the machine in operation. The stored energy is used to run hydraulic machine like hydraulic crane, hydraulic lift, etc.

Differential Hydraulic accumulator The main disadvantage of a simple hydraulic accumulator is that heavy weight are required on a ram to store the fluid under very high pressure.

Hydraulic Intensifier For transforming hydraulic power at low pressure into a reduced volume at higher pressure Which is used for increasing the intensity of pressure by utilizing the energy of the large quantity fluid.

Hydraulic Press A hydraulic press is used to lift heavy load with the application of much smaller force It works on the basis of pascal’s principle.

Hydraulic crane

Jigger

Hydraulic Crane and Lift The function of jigger is to raise or lower a load. The jigger can be used either vertical, horizontal or inclined position.

Hydraulic Lift

Hydraulic ram

Hydraulic ram Hydraulic ram is a hydraulic device which is used to lift a small quantity of water to a greater height using the energy of a large quantity of water available comparatively at low heads. The efficiency of the hydraulic ram depends upon Losses in pipe Losses in valve box Ratio of length of supply pipe to delivery head (l/H), & ratio of supply head to delivery head(h/H) For optimum performance l/H = 2.5 h/H = 5

 

Advantages It has no moving parts. No lubrication is needed. It does not need any external power. Repair and maintenance cost is negligible. Disadvantages Wastage of water is high. It makes a lots of noise.

Fluid Coupling

Fluid Coupling It is used to transmit the power and is combination of a centrifugal pump and turbine, pump act as a driver and turbine as a driven. At full speed, the two shaft are supposed to be rotating at the same speed, because of slip, driven shaft speed is less about 2%. Efficiency of the coupling is 98%.

Torque converter

Torque converter In torque converter third component is added stator between the pump impeller and turbine rotor. The function of the runner is to change the direction of flow. The efficiency of the torque converter lies between the 85 to 87 %. Torque converter gives the higher efficiency at the low speed ratio as compared to fluid coupling. There is decrease in efficiency when the speed ratio increases from 0.5 to 0.6 Use combination of torque converter and fluid coupling for efficient performance over the full range of speed ratio. In that case, as soon as the output torque becomes equal to the input torque, the fixed guide vane(stator) start rotating and combination start working in a fluid coupling.

Air lift pump

Hydraulic Jack