Pdf flow characteristics of external gear pumps considering. The pl series is designed to meet the application needs of either a pump or a motor. This type is, in addition, also very suited for high viscosity extinguishing media concentrates. Internal gear pump model gp2, series 2x fixed displacement dr 67180394 internal gear pump model gp2 typical application. These types of pumps have gears in it which have the ability to provide pressure energy to the fluid in the pumps. Review different pump types commonly used understand the difference between centrifugal pumps and positive displacement pumps.
Centrifugal pumps the centrifugal pump produces a head and a flow by increasing the velocity of the. A simple solution for metering applications liquiflo has been manufacturing highquality gear pumps for over 40 years variable speed motor motor controller supply tank process tank ph sensor gear pump 420 ma signal flow figure 5 shows a schematic hookup of a metering application precisely controlling the flow rate of a liquid into a process. Gear pumps allow differential pressures up to maximum 5. Recognize different gearing systems and relative advantages and disadvantages between them. Making these units the most flexible in todays cost minded market. Albany gear pumps are available in many configurations, whilst they may look the. They typically consist of a northern heavy duty gear pump, electric motor, shaft coupling, and coupling guard, mounted on a unit base. External gear pumps work external gear pumps are similar in pumping action to internal gear pumps in that two gears come into and out of mesh to produce flow. The external gear pump uses two identical gears rotating against each other one gear is. External gear pump series g azpg22 fixed pumps v 22.
The external gear pump consists essentially of a pair of gears supported. Base not rigid enough tighten holddown bolts on pump and motor or adjust stilts. A gear pumps rotating assembly consists of two gears, a driving gear and a driven gear. Internal gear pump the diameter of the adapter flange is 39 mm, but the oval shape of the pump housings are bigger in comparision with the outer diameter 37 mm of the. The cavities are the clearances between the gears or lobes and the body of the pump. This page was last edited on 22 november 2014, at 19. In simple words, we can say that the gear pumps transfer the fluids from one part to another using gear mechanism. Sudovest via massari marzoli,6 21052 busto arsizio va tel. The term positive displacement for gear pumps describes the fixed amount of fluid they move for each revolution. However, the external gear pump uses two identical gears rotating against each other. As depicted in figure 7 right, downhole oil well pumps represent examples of multistage centrifugal pumps and often include 20 or 30 modular stages.
Useful information on gear pumps michael smith engineers. This page will introduce you to gear pumps, applications that use gear pumps, and the use of powder metal for producing pump gears. Gear pump size 1 1,8 3 10 15 17,5 37 45 55 90 graphicmind 0309 zona ind. This component will be highly dependent on the output pressure of the pump. Gear pumps are the most common type of positive displacement pump. Download the file data into the pump memory disconnect the pump from the pc carry out your application on the spot, using the pump as a standalone unit unique. It delivers a smooth pulsefree flow proportional to the rotational speed of its gears. All structured data from the file and property namespaces is available under the creative commons cc0 license. End clearance is the closeness of the rotor gear to the head of the pump. Each individual pump is preset for rear connection to one or more pumps by interposition of the appropriate coupling flange. To keep your pump maintenance free it is necessary to check the spring of relief valve, meshing clearance between teethes and casing of.
Pdf gear pumps represent the majority of the fixed displacement machines used for. They are ideal for transferring high viscosity fluids such as automotive oils, plastics, paint, adhesives, and soaps with a steady and pulseless flow and offer selfpriming capabilities. Gear pumps galtech group 2 start pumps 12 tooth gears and consequent decrease in noise levels. They are one of the most common types of pumps for hydraulic fluid power. Gear pump manual original instructions albany pumps.
A parker pressureloaded gear pump consists of two, intermeshing, hardenedsteel, precisionground gear assemblies. Pump model hg050 hg075 hgioo hg125 hg150 hg200 hg 250 inlet outlet 12 x 12 34 34 112 x 112 20 30 50 75 110 225 350 51 63 5 64. The size of volume between teeth of the gear, amount of reverse flow and the speed of the rotation per minute is used to regulate the flow of gear pumps. External gear pumps external gear pumps are similar in pumping action to internal gear pumps in that two gears come into and out of mesh to produce flow figure 2.
The original design is from a book for mechanical design. When using equivalent pump speeds, gear pumps have comparable shear imparted compared to progressive cavity pumps. It is vital that the fluid passing through the pump is clean and free from. Gear pump 0 group motor reference lab e bfback inlet and front out. Gear pumps use the actions of rotating cogs or gears to transfer fluids. Understand geometry of different gears and their dimensional pro perties. The close tolerances between the gears and casing mean that these types of pump. The rotary gear pump is an alternative that should not be o verlooked for low to moderatepressure 100 psig or less applications. Rotary gear pump selection guide rotary gear pumps are positive displacement pumps that are commonly used for liquid circulation, lubrication, pressure boosting, filtering, medium pressure spraying, sump draining, drum and vat filling, and general fluid transfer applications. Properly selected, a gear pump will be more reliable and less maintenance intensive handle solvents, hot liquids and many chemicals that cannot be handled with. Group 1, 2 and 3 gear motors technical information. The pumpmotor is warranted for a period of one year from the date of. We frequently build and assemble pump unit assemblies, or skids as they are sometimes called. Unesco eolss sample chapters mechanical engineering types and performance of pumps and compressors essam e.
Download practical centrifugal pumps design, operation. This type of pump does a good job as long as the supply of liquid. Excessive noise and vibration suction andor discharge piping not anchored or properly supported anchor per hydraulic institute standards. Gear pumps are commonly used for pumping lube oil, and they almost always have a strong vibration component at the tooth mesh frequency, which is the number of teeth on the gear times the rpm. Gear design objectives understand basic principles of gearing. Misalignment longcoupled pump align pump and motor. This pump type cannot run dry or handle abrasiveladen fluids, and places high shear on the. Khalil encyclopedia of life support systems eolss 1. One rotor of internally cut gear teeth will mesh with one externally cut gear. Fluid shall be carried between gear teeth and shall be displaced when.
Should it pump the hole dry and air enter the pump, it will stop pumping and become airbound. Flange and cover in aluminium or on request, cast iron. The pumps birotational feature helps reduce inventory requirements. In general albany provides three types of shaft sealing. A gear pump uses the meshing of gears to pump fluid by displacement. Pumping in a gear pump takes place when the driving gear meshes with the driven gear to form cavities that moves the fluid. All cast iron construction with 4 ports and roller bearing design. Please select the required pump by using the selection tables standard types or after consultation with bosch rexroth. Files are available under licenses specified on their description page. Put the standard centrifugal pump above the liquid, and problems can arise, as it does not have the ability to create a vacuum and prime itself. Rotary gear pumps finds wide application in power plant, steel mills, refineries, oil storage instolations etc. The rotary gear pump merits consideration because it overcomes many of the problems encountered with reciprocating metering pumps and is generally much less expensive. Practical centrifugal pumps design, operation and maintenance by the authors paresh girdhar, moni is a comprehensive guide to pump construction, application, working, maintenance and management issues.
Gear pump components pump unit assembly northern pump is a full service gear pump manufacturer. The mk20s wide range of output flowspressure ratings of up to 3000 psi and. Understand gear trains and how to calculate ratios. Pdf this article investigates the volume change law of trapped fluid in the meshing process and the flow characteristics of external gear pumps. An external gear pump with an adapter flange for a motor drive.
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