Factory set gear pumpheads overview of gear pumps flow rates and models flow rates mlmin bar model page min. Hi, in plant some of the raw materials we have to charge through barrels and pump into reactorvessel. A gear pump uses the meshing of gears to pump fluid by displacement. High working pressures flange and cover in aluminium or on request, cast iron. Jul 18, 20 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 pressure balanced design of the pumps provides high efficiency for the entire series. Positive displacement pumps allow liquid to flow into an open cavity trap the liquid in the pump transport liquid from the suction to discharge port mechanically force liquid out of the pump. Series diu round hub pumps series diu square flange pumps series diu double pumps series us stainless pumps series ub bronze pumps mag drive gear pumps barrier seal pumps. The rotating gears develop a liquid seal with the pump casing and create a vacuum at the pump inlet. The rotation of the gears is such that the liquid comes into the inlet port and flows into and around the outer periphery of the two.
Rexroth external gear pumps are available as standard gear pumps in the 4 series of b, f, n and g, and as silence gear pumps, in which the displacements are graded by different gear widths. Rexroth external gear pumps are available as standard gear pumps in the 4 series of b, f, n and g and as silence gear pumps in the series of s, t and u, in which the displacements are graded by different gear widths. Further configuration variants are given by different flanges, shafts, valve arrangements and multiple pump combinations. Fluid, drawn into the pump, is enclosed within the cavities of the rotating gears and transferred to the discharge. This bidirectional flow characteristicis one of the many advantages inherent to gear pumps. This is because the hydraulic gear pump is one of the main components used in manufacturing, con. Pdf an investigation of external gear pump efficiency.
Gear pumps are also widely used in chemical installations to pump high viscosity fluids. The gear pump was invented around 1600 by johannes kepler gear pumps are also widely used in. For vertical suction lift should pump run dry between uses, rewet pump or use foot valve. The straightforward and rugged construction guarantees long service life without the need for extensive maintenance. But, one day, your internal gear pump stops performing its daytoday function and all heck breaks loose. It may be calculated from the physical dimensions of the gears, or it.
The computeraided design cad files and all associated content posted to this website are created, uploaded, managed and owned by third party users. Precise by design, they deliver accurate and repeatable performance, a smooth flow and a pressure up to 18 bar 260 psi. Several typical failures of external gear pump are presented. In re cent years we have focused on important markets, such as materials handling.
To return to this page, please click on the red text in the top corner of each page. Introduction and contact details tfp50 group 12 gear pumps tfp0nn 3. What links here related changes upload file special pages permanent link page. The eiph is a consistent advancement that already for over 40 years in the industry used gapcompensated internal gear pump technology, system eckerle. The ap250hp cast iron gear pump mix the best part of. Internal gear pumps are primarily used in nonmobile hydraulics e. Defects classification pawel pietkiewicz chair of mechanics and machine design university of warmia and mazury in olsztyn k e y w o r d s. Pumps and pumping system bureau of energy efficiency 1 syllabus pumps and pumping system. This nomenclature differen tiates it from an internal gear pump. They typically consist of a northern heavy duty gear pump, electric motor, shaft coupling, and coupling guard, mounted on a unit base. The arrows indicate the direction of the pump and liquid. We frequently build and assemble pump unit assemblies, or skids as they are sometimes called.
During flushing and loading there is a bypass function around the gearwheels, in parallel to an internal flushing of gearwheels and shafts. Simple combinability to multiple pumps with separate or common inlet is given. Liquid enters the suction port between the rotor large exterior gear and idler small interior gear teeth. Prediction of potential failures in hydraulic gear pumps. These needs are ideally served by the aluminum pumps in the skp1nn and skpnn ranges. Internal gear pump overview internal gear pumps are exceptionally versatile. Pdf an investigation of external gear pump efficiency and. External gear pumps utilize two identical gears with external teeth to generate flow. Ballcheck or diskplate valves may be lightly springloaded to increase seating rate, but suction lift is reduced. Fluid shall be carried between gear teeth and shall be displaced when. Our heavy duty pumps are designed around high reliability as well as long life. Pumps of this type are called double volute pumps they may also be referred to a split volute pumps. What is an internal gear pump and why do you need it. Gear pumps are capable of selfpriming because rotating gears evacuate air in the suction line.
Gear pumps are capable of moving small suspended solids but due to the meshing of gears they can be damaged by pumping large solids. The pump is so named because it has two gears that are sidebyside or external to each other. External gear pumps can come in single or double two sets of gears pump configurations with spur shown, helical, and herringbone gears. Useful information on gear pumps michael smith engineers. Internal gear pumps operate by drawing fluid into the pump inlet between the rotor large exterior gear and idler small interior gear teeth, operating with a gearwithinagear principle. The standard snp2 pumps are offered throughout the given range of displacements. Also, gear pumps may be limited in terms of chemical compatibility, with pump materials typically crafted of stainless steel, ptfe, or peek. Gear pumps are used in all types of manufacturing industries for the transportation of both thin and thick liquids, from diesel fuels to chocolate. Gear pump abbs precision paint pumps are specifically designed for fast color change. Centrifugal pumps can also be constructed in a manner that results in two distinct volutes, each receiving the liquid that is discharged from a 180. Gear pumps use the actions of rotating cogs or gears to transfer fluids. The external gear pump uses two identical gears rotating against each other one gear is. While they are often used on thin liquids such as solvents and fuel oil, they excel at efficiently pumping thick liquids such as asphalt, chocolate, and adhesives. Our gear pumps have a sturdy design, offering high reliability as well as long life.
Maintenance for gear pumps is more timeconsuming than peristaltic pumps, as users must open up the pump to clean its gears and the pump head. Can be combined with int ernal gear pumps, radial piston pumps and external gear pumps fr ame sizes 2 and 3 size 5 to 16 maximum pres sure 350 bar displacement 5. They work with just one gear stage, and thanks to their. One rotor of internally cut gear teeth will mesh with one externally cut gear. Typical noise level is less than 75 dba under normal operating conditions. An investigation of external gear pump efficiency and stribeck values article pdf available in sae technical papers 8 september 2012 with 2,547 reads how we measure reads.
Pump flow can be varied by varying input speed with pulleys, a gear reducer, or electric motor inverter vfd. Centrifugal pumps develop pressure by increasing the velocity of the liquid liquid is literally flung out of the cutwater. In order to improve the efficiency of pumps maintenance and reparation, a new kind of tool is mentioned which could predict the life of gear pump before failure occurred. External gear pumps are usually available with either spur gears, making them too bidirectional, or herringbone gears, which are for particularly viscous fluids but do not allow reversible flow. Haight pump manufacturers the 24ub bronze gear pumps, combining our versatile pump design with bronze and corrosion resistant materials to meet the needs. The pumps are ideal for use with variable speed drives. The main characteristics are valid for hydraulic oils din 51524 with a viscosity of 2. External gear pump overview external gear pumps are a popular pumping principle and are often used as lubrication pumps in machine tools, in fluid power transfer units, and as oil pumps in engines. Displacement d the displacement of a rotary gear pump is the volume displaced during one complete. A gear pump is a type of positive displacement pd pump.
The useful viscosity range of an internal gear pump is from 1cps to over 1,000,000cp. The gear pump was invented around 1600 by johannes kepler. When solids are present in the fluid they may act as abrasives, causing damage to the gears and increasing downtime. Mechanical pumps in mechanical pumps, the gas present in a vacuum system is transferred from a low pressure to a. Gear pumps are used in all types of manufacturing industries for the transportation of both thin and thick liquids, from chocolate to diesel fuel. Gear pump components pump unit assembly northern pump is a full service gear pump manufacturer.
Group 2 gear pumps technical information total hydraulics bv. Hc series multiple gear pumps cross cross stock no. The reasons of the pump failure are analyzed in detail. With the unique shaft cleaning function, fast and outstanding cleaning results are achieved. Theyre great for highly viscous fluids and have only two moving parts. A gear pump uses two meshing, toothed cogs to force water from the inlet of the pump through to the outlet. Sauerdanfoss high performance gear pumps are fixed displacement pumps which consist of the pump. Troubleshooting guide troubleshooting guide part 1 problem possible cause corrective action. Internal gear pumps are versatile pieces of rotating equipment. The external gear pump uses two identical gears rotating against each other one gear is driven by a motor and it in turn drives the other gear. Troubleshooting guide troubleshooting guide part 1 problem possible cause corrective action no discharge.
Ap1 is an all aluminum construction, high pressure hydraulic gear pump. They are one of the most common types of pumps for hydraulic fluid power applications. Fluid shall be carried between gear teeth and shall be displaced when the gear teeth mesh. Standard gear pumps to view a gear pump, please click on the name below or use the bookmarks in your pdf software. Pumps with integral relief valve snp2en and snp2in. Issue 5 section 1 standard gear pumps to view a gear pump, please click on the name below or use the bookmarks in your pdf software. In such cases there are provided some gear pump for charging of raw material viscosity varies from 100 cp to cp and also with season viscosity vary of similar raw materials. Sauerdanfoss gear pumps and motors are ideal for a wide range of applications for. Each cad and any associated text, image or data is in no way sponsored by or affiliated with any company, organization or realworld item, product, or good it may purport to portray. The internal gear pump is exceptionally versatile and also capable of handling thick fluids. Series d hydraulic gear opencircuitgear pumps technical. The design of the internal gear pumps, series qxeh, is completely focused on high customer benefits. Each individual pump is preset for rear connection to one or more pumps by interposition of the appropriate coupling flange. Internal gear pumps internal gear pumps operate by drawing fluid into the pump inlet between the rotor large exterior gear and idler small interior gear teeth, operating with a gearwithinagear principle.
The pumps are ideal for use with variable speed drives over a very wide speed range and for operation in reverse mode. The snp2nn pump accommodates sae 9tooth and the skp2nn is a. Another important advantage of the gear pump is its selfpriming capability. Series d hydraulic gear pumps technical manual general information the d series pumps have an excellent reputation for rugged, dependable performance at continuous pressures to 276 bar 4000 psi and speeds to 3400 min1 rpm. It delivers a smooth pulsefree flow proportional to the rotational speed of its gears. Fabis insitute of applied informatics, cracow university of technology,al. External gear pump overview michael smith engineers. The qx pumps are the 5th generation of bucher internal gear pumps, which have proven themselves in thirty years of service around the world.
Gear pumps are either external or internal based on their design and operation. 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. Internal gear pump pgh fixed displacement series 2x. Concentric is one of the worlds leading manufacturers of hydraulic pumps. Rotary gear pumps are positivedisplacement pumps operating to trap equal increments of fluid in the space between gear teeth and the pump housing for transport between intake and discharge ports. The operating pressure at the pump outlet side is specified also for fireresistant and environmen tallyfriendly fluids hfc.
Steady and pulseless flow both types, but in particular internal gear pumps, provide a smooth, constant flow as their gears roll in the same. Group 3 gear pumps technici al information 77c 33m 55k 50c 100 66m 88 66m 88 5 turolla l1016456 september 20 rev c snp3nn 01ba cut away pump design sep3nn the sep3nn gear pump is. The standard mounting flange is as detailed on the installation drawing and porting is. Tandem and multiple pumps are available worldwide in more than variants. Ap212 and ap300 frame sizes improving power density due to wide range of displacements from 15 to 54. Demonstrative drawing of the pz2 type gear pump structure. Group 3 gear pumps technici al information 77c 33m 55k 50c 100 66m 88 66m 88 5 turolla l1016456 september 20 rev c snp3nn 01ba cut away pump design sep3nn the. The fluidotech ig series positive displacement gear pump has been designed to handle viscous fluids with impurities in suspension and temperatures up to 200 c 392 f whilst delivering a smooth flow.
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