Hydraulic Pumps

Hydraulic pump is a mechanical device which is used to converts the mechanical power of the system into hydraulic energy. To overcome the pressure which is induced by the load hydraulic pump generates high power flow.

A hydraulic pump performs basic two functions when it operates:

• A mechanical action which creates a vacuum at the pump inlet, it permits atmospheric pressure to force liquid from the reservoir into the inlet line to the pump.

• The second function which is performed its mechanical action that delivers liquid to the pump outlet and then forces it into the hydraulic system.

Why we need Hydraulic Pumps?

We need hydraulic pumps because they are the main sources of power for different dynamic machines. Hydraulic pumps have the power to push large amount of oil through the hydraulic motors and cylinders. In returns, the pump converts the mechanical work of energy into the hydro static energy.

Principle on which Hydraulic pumps operates

According to the displacement principle the hydraulic pump operates. In this principle the existed mechanically sealed chambers in the pump may involves. The purpose of these chambers is to transport the fluid from suction port (inlet) of the pump to the pressure port (outlet). These sealed chambers also ensure that no direct connection between the inlet and outlet port of the pump. This is the main reason that these pump suitable to operate at very high pressure and they are also ideal for Hydraulic systems. The mechanism of pump is shown in the figure below:

Mechanism of a pump

Types of Hydraulic Pumps

Depending on their different functional and other system requirements such as range of pressure or flow, operating medium, type of drive etc. hydraulic pumps are manufactured. Hydraulic pumps may have large range of design principle and configurations. All pumps can’t fully meet the requirements of the system. So for that reason different types of hydraulic pumps exists which are given below:

Hydraulic Gear Pumps

External gear pump

Internal gear pump

Gear ring pump

Screw spindle pump

Hydraulic Vane Pumps

Single chamber vane pump

Double chamber vane pump

Hydraulic Piston Pumps

Axial piston pump

Radial piston pump

Uses of Hydraulic Pumps

Hydraulic pumps are used in hydraulic machines. While selecting a hydraulic pump it must have good frequency, pressure and temperature capabilities. Hydraulic pumps are used to do different type of works such as open, close, lower and to lift components.They are also used in field services like machining and assortment of construction

A pump produces liquid flow or movement which is necessary for the development of pressure. This is a function of resistance to fluid flow in the system. For example, the pressure of the fluid at the pump outlet is zero for a pump not connected to a system (load). Further, to overcome the resistance of the load, pressure will rise to the level for a pump delivering into the system.

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