pumps

A pump is a mechanical device used to move liquids or gases. The earliest pump was described by Archimedes around 300 BC and is known as the Archimedes screw pump. Pumps work by using mechanical forces to push the material, either by physically lifting, or by the force of compression.

Types - Pumps fall into two categories: positive displacement pumps, which force fluid from one sealed chamber to another with little leakage, and dynamic pumps, which use the momentum of the fluid to move it across an unsealed chamber.

Positive displacement pump - This type of pump forces the fluid from one chamber to another by reducing the volume of the first chamber while increasing the volume of the second. Such a pump produces a constant flow regardless of intake pressure or outlet pressure, unless the intake pressure drops below a certain limit, causing cavitation, or the outlet pressure exceeds the capacity of the pump, causing pump failure. These pumps often have a relief valve to prevent the latter problem. The heart of animals is a natural example of this type of pump.

Reciprocating positive displacement pump -

Hydraulic ram

Nodding donkey

Stirrup pump

Vane pumps (with flexible or rigid vanes)

Piston pumps

Diaphragm pump

Rotary positive displacement pump -

Archimedes screwScrew (or progressing cavity) pump

Gear pumps (internal and external)

Lobe pumps

Peristaltic pump (uses a process similar to peristalsis in animals)

Circumferential piston pump

progressive cavity pump : pumps fluid by the rotation of a helical steel rotor inside a rubber pump body with a helical aperture

Dynamic pump - The dynamic pump causes the fluid to move from inlet to outlet under its own momentum. This type tends not to need a release valve, because as the outlet pressure rises the pump simply becomes less efficient. Fluid motion can be rotary, as in centrifugal pumps, or linear, as in reciprocating dynamic pumps.

Rotary dynamic (centrifugal) pump - This type of pump contains a rotating part called the ''impeller'' inside a stationary cavity called the ''volute''. The impeller forces the fluid to rotate, and thereby to move from inlet to outlet under its own momentum.Examples:

turbopump: the fluid is moved by the blades of a high-speed turbine.

submersible pump : the fluid is moved by a pump joined to a sealed motor and submerged in the fluid to be pumped.

split case centrifugal pump : the fluid is pumped by a horizontal or vertical pump with a split volute to allow maintenance access.

axial flow pump : the fluid is pumped by a propellor type impeller inside a section of pipe.

Linear or reciprocating dynamic pump - The Vortec Transvector is one example of a no-moving-parts dynamic air pump. A film of fast moving air formed by releasing high pressure air through a slit is discharged adjacent a surface, and drags ambient air along with it. The higher the pressure of the primary air supply, the worse the performance.It is an example of an ejector pump. Steam ejectors are used to cool bleach water so it will retain the chlorine. They simply discharge a boiler into a tube, sucking water vapor out from above a sealed tank. The water inside slowly cools. Not very efficient, but doeshing useful with waste steam, simply.A well pump is also a dynamic pump. Since water will boil if any attempt is made to "suck" it more than about thirty feet high, high pressure water is injected in at the bottom of a well, forcing the well water to flow upwards much more than thirty feet.Ejectors are used to augment the flow in turbojets, near the aft end.The Coanda effect is the tendency of such a moving stream to cling to a surface, even when the surface deflects the stream away from its original direction. The surface seems to pull the stream. It is a manifestation of Bernoulli's law: since energy is conserved, a moving fluid has a lower pressure than a static fluid.Centrifugal Pump ComponentsPump Casing - To keep the fluid in the pump.Impeller - The component that drives the fluid to a higher pressureShaft - The rod that connects the motor to the impellerMotor - The part that powers the pumpSeal (mechanical)Mechanical Seal, labyrinth seal, gasket or Packing - To keep the fluid from leaking out to the atmosphere. There are some magnetically driven centrifugal pumps that do not need such seals or packing. Bearing (mechanical)Bearing - To keep the shaft rotating freely in place.Outboard bearing - Bearing at motor end of shaftInboard bearing - Bearing at impeller side of pump. Need 2 bearing to hold shaft in placeOiler - To provide oil to lubricate the bearing so it will not jam. May use grease also, if so, grease gun inject grease through nipple to provide lubrication (Nipple is a type of joint with female threads.)

See also -

Pumping station

External links -

impeller.net - impeller.net - Online Pump Magazine

dmoz.org - Pump suppliers in DMOZ Open Directory ProjectCategory:Pumps*Category:Mechanical !engineeringcs:Čerpadloda:Pump ede:Pumpeeo:Pumpilofr:Pompeio: Pompoit:Pompahe:משאבהnl:P omp? !(machine)ja:ポンプpl:Pompar u:Насосsv:Pumpzh:泵 DEBUG REDIRECT (pump)

Survival Dynamo Flashlight
We are wholesale suppliers and retailers of Survival Dynamo Flashlight working without batteries.
http://www.dynamoflashlight.ca/main/

Self Cleaning Filters Strainers and Screens
Manufacturer of self cleaning filters and submersible pumps with self cleaning intake screens
http://www.rotorflush.com/

hydraulic pumps/motors
mfg hydraulic gear pumps and gear motors.
http://www.hydraulicgearpump.com/

Gerhard W. Ruppel-Hydraulik
We produce, construct, sale, repair and put in service many different hydraulic components, devices and complete systems. We are official distributor of SUN-Hydraulics.
http://www.ruppel-hydraulik.de/

Vacuum Pumps
Mechanical vacuum pumps for sale and rent including Liquid Ring, Rotary vane & Rotary piston type pumps.
http://www.bestvacuumpumps.com/

Pumpen und Anlagenbau WAKER
Als Pumpenhersteller liefern wir Ihnen ein großes Spektrum an Pumpen für die Wasserversorgung in Industrie und Privat.
http://www.pumpe.de/

Heart of Texas Equipment Rental, Inc.
Equipment Rental Company, serving the hill country of Central Texas
http://www.hotrent.com/

Hargraves - Miniature Diaphragm Pumps, miniature vacuum pumps, Solenoid Valves
Hargraves is a global leader of advanced miniature fluidic delivery and control solutions. Our high quality air and gas miniature diaphragm pumps, liquid diaphragm pumps, micro compressors, vacuum pumps and miniature solenoid valves are found in a wide range of challenging application environments including medical, analytical instrumentation, fuel cell, and digital printing systems. We are committed to providing innovative solutions aimed at advancing our customers’ product technology by increasing their product quality, expanding their performance capabilities, and significantly reducing their overall operational costs.
http://www.hargravesfluidics.com/

A-Archer Sewer and Plumbing Service
A plumbing copmpany for all your plumbing needs big or small.
http://www.a-archer.com/

Rotary Transmitters - 42'000 rpm
ROTRANS is a high speed, high performance rotary transmitter, linking rotary test item with measurement instrument, thaks the unique liquid metal technology.
http://www.rotrans.ch/

Souren Kalaydjian Import - Export
Handel mit Restbeständen und Überproduktionen von Industriegütern jeglicher Art. Trade with remainders and overproductions of industrial goods of different kinds.
http://www.eska-imex.com/

Koi Japanische Koi japanese koi Japankoi
Original japanese - japanische Koi - Japankoi Koipond Koiteich
http://www.pfalz-koi.de

ScienceDirect
Research papers published on the net , subscription required for some sections.
http://www.sciencedirect.com

Goulds Pumps
Pump design and technology. Pump manufacturing and innovations in pump engineering and materials.
http://www.goulds.com

Hydraulic Institute
A non-profit trade association for pump manufacturers and suppliers. Also, a standards development organization that has been creating pump standards since 1917.
http://www.pumps.org

Classic Pumps
Genuine leather high heels in sizes 3.5-12.
http://www.classicpumps.com/

Grundfos
Danish manufacturer of a wide range of centrifugal pumps and systems for water applications in industry, irrigation, heating and wastewater treatment. Global sales network. Online selection tools, catalogue and library available.
http://www.grundfos.com/