Hydraulic pumps change mechanical vigor and appeal into hydraulic fluid power. The basic idea is very simple: force that is applied at one position is transmitted to an additional one position using an incompressible fluid, like oil, which cannot be compressed but rather is displaced when pressure is applied.
A reservoir, a hydraulic cylinder, and a pump make up the three main parts of a hydraulic pump. Pumping hydraulic fluid from the depot into the lowest cavity of the cylinder causes the piston rod to be pushed up, which pushes the fluid in the other cavity back into the reservoir. This policy pressurizes the chamber and extends the piston to its full length. Pumping hydraulic fluid into the upper chamber of the cylinder pushes the piston rod down, pushing the oil in the other chamber back into the reservoir, completing the cycle.
Hydraulic Press Brakes
Popular Hydraulic Pump Types
Vane pumps, piston pumps, and gear pumps are the leading types of hydraulic pumps
Gear pumps - uses gears to pump fluid by displacement. Hydraulic gear pumps are one of the most coarse types of pumps. There are some advantages and disadvantages to gear pumps. The advantages are: high speed, high pressure, and quiet operation. The disadvantages are: the use of four bushings in the liquid area and fixed end clearances.
Rotary vane pumps - are positive-displacement. They include a ring mounted inside a cylindrical case. There are a number of radial slots in which sliding vanes are located. Mounted to the case is the ring and the vanes are designed to press against the inside wall of the case. Hydraulic pressure or spring force or centrifugal force as the ring is rotated will cause the vane to be forced against the wall.
Axial piston pumps - are determined displacement. There are some pistons in a circular arrangement in a cylinder block.
Radial piston pumps - a circular arrangement of hydraulic pistons, and valves which allow pressures greater than 650 Bar (~10,000 psi) to be built.
Screw pumps - determined displacement pumps. Have one or more screws that rotate to transfer high or low viscosity fluids along an axis.
0 comments:
Post a Comment