Gear pumps allow differential pressures up to maximum 5. We have medium pressure and highpressure pumps in our product portfolio. Review different pump types commonly used understand the difference between centrifugal pumps and positive displacement pumps understand the working principle of the tuthill. The internal gear pump is exceptionally versatile and also capable of handling thick fluids. Rotary vane pumps similar to scroll compressors, these pump have a cylindrical rotor encased in a similar shaped housing. Two identical gears positioned side by side, rotating into one another. Installation, operation, maintenance user instructions user instructions 71569246 2167be1. Liquiflo gear pumps are manufactured from highalloy materials such as 316 stainless steel, alloyc and titanium, and a variety of corrosionresistant and wearresistant internal materials. Cast iron this is the economical wide range of noncorrosive applications material option. The straightforward and rugged construction guarantees long service life without the need for extensive maintenance. Tuthill process pumps, available in positive displace internal gear and circumferential piston designs, successfully handle the toughest process applications. As is well known, external gear pumps are widely used in the fluid power field. The pump and gear box are most commonly mounted together as a single unit, and the pump is driven directly from the gear box, by means of a chain, gears, or belt. For viking pumps, the material choice refers to the pressure containing component of the pump the externals of the pump, like the casing.
The spaces between the gear teeth transport the fluid on either side of a crescent to the discharge side, and. Were building on our evergrowing experience to deliver innovative pumping solutions including custom designs to thousands of customers who use millions of viking pumps in some of the worlds toughest applications. The internal gear pumps are available in various sizes and pressure levels from 3. Internal gear pumps are more robust having only one bearing sometimes two running in the fluid. Engineered to reliably pump viscous fluids over a broad range of flows and pressures, the ga series superior between bearings, external gear design offers the benefits of pulse free operation, dryrun capability. The hydraulic oil is drawn into the pump at the point where the gear teeth begin to separate and is carried to the outlet in the space. Operates a gear within a gear principle, whereby one gear the idler is positioned inside another gear the rotor. Gear pumps are the most popular type of positive displacement pump.
External gear pumps have four bearings in the pumped medium, and tight tolerances, so are less suited to handling abrasive fluids. Ga series gear pumps have long been workhorses in highly viscous applications within a multitude of industries due to their dependability, efficiency and low total life cycle costs. Pdf a variable flow internal gear pump is a fixed displacement unit where. Our internal gear pumps are characterised by extremely low noise levels, low pulsation and a very large speed range. Theyre also birotational, meaning that the same pump can be used to load and unload vessels. Gary dyson is head of product development aftermarket, with union pumpcompany,inbattlecreek,michigan. General purpose gear pumps are wellsuited for lowpressure transfer of lubricating fluids with moderate viscosities. Gear pumps a simple type of rotary pump where the liquid is pushed between two gears. Tandem and multiple pumps are available worldwide in more than variants.
For everything else, vikings heavyduty pumps offer a spectrum of options to match the pump to the application. Outline of the gear pump a gear pump is a kind of rotary pump and is defined as a positive displacement pump. This pumping principle produces a pulsating flow, rather than a smooth flow. The pump which you are now using is of the external gear type. Because internal gear pumps have only two moving parts, they are reliable, simple to operate, and easy to maintain. The two gears rotate in the same direction, with the inner gear rotating faster than the outer. Precise by design, they deliver accurate and repeatable performance, a smooth flow and a pressure up to 18 bar 260 psi.
The internal design is seen as being reliable, easy to operate and maintain due to only two moving parts being present. They are compact, relatively inexpensive and have few moving parts. In a positivedisplacement pd pump, a discrete amount of fluid is trapped, forced through the pump, and discharged. Simple design as in conventional gear pumps high pressure capability as in piston pumps low viscosity operational capability as in centrifugal pumps low noise levels and ripple free. Internal gear pumps are primarily used in nonmobile hydraulics e. Envirogears mission is to engineer the worlds safest and most reliable internal gear pumps by understanding our customers needs and. The crescent seal internal gear pump consists of an inner and outer gear separated by a crescentshaped seal. External gear pump internal gear pump gerotor pump lobe pump. A selected program of single and multiple pumps is available within 10 working days. The internal gear pump is nonpulsing, selfpriming, and can run dry for short periods. They are one of the most common types of pumps for hydraulic fluid power applications. The internal gear pumping principle was invented by jens nielsen it uses two rotating gears which unmesh at the suction side of the pump to create voids which allow atmospheric pressure to force fluid into the pump. I will follow this up with a post on piston pumps soon.
The original design is from a book for mechanical design. The qx pumps are the 5th generation of bucher internal gear pumps, which have proven. Best suited to fluid with some lubricity, fluidotech internal gear pumps offer an exceptionally high flowpressure capability in a very small package. The gear pump was invented around 1600 by johannes kepler gear pumps are also widely used in chemical installations to pump high viscosity fluids. Positive displacement pumps positive displacement pumps, in contrast, have very little slips, are selfpriming and pump against very high pressures, but their volumetric capacity is low. It has two meshed gears revolving about their respective axes. This is an animation video on the working of an internal gear. A hydraulic gear pump is often used in multi pump systems, so this type of oil gear pump is used as a lubrication pump in a machine tool or as an oil pump for an engine.
Pump school instructs fluidhandling engineers on positivedisplacement rotary pumping principles. 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. Gear pumps are often used in pumping relatively viscous liquids, such as some viscous liquid hydrocarbons, liquid fuels, lubrication oil pumping in machinery packages, hydraulic units and fluid power transfer units. The gears themselves are lubricated by the fluid, which is of a lubricating nature. It delivers a smooth pulsefree flow proportional to the rotational speed of its gears. Internal gear pumps are rotary positive displacement pumps which move the same amount of fluid with each revolution of the shaft. Liquiflo gear pumps can be configured with packing, single or double mechanical seals or magneticdrive. The gear pump was invented around 1600 by johannes kepler gear pumps are also widely used in chemical installations to pump. The external gear pump uses two external spur gears, while an internal gear pump uses an external and an internal gear.
The rotor is a larger gear and also an inner gear, and it has the teeth projecting inside. Below, youll find an easy reference chart updating the old pump head numbers. External gear pumps are used preferably for liquids that do not contain any solids. An internal relief valve is an option with the le series. In an internal gear pump fluid enters int the suction port between the rotor and idler it is a small interior gear teeth. The cig pump design combines the best features of a variety of technologies in one single, ef. These options allow liquiflo gear pumps to be specially engineered to handle many difficult chemicals. Internal gear pumps can be used up to a continuous pressure of 315 bar 4550 psi depending on the frame size. While they are often used on thin liquids such as solvents and fuel oil, they excel at efficiently pumping thick. The pumps are ideal for use with variable speed drives. Worldwide leader since 1911 for positive displacement.
The fluid travel through the pump between the the teeth of the gear withina gear principle. Troubleshooting guide troubleshooting guide part 1. A gear pump uses the meshing of gears to pump fluid by displacement. However, some designs of gear pumps, particularly internal variants, allow the handling of solids.
These options can help reduce life cycle cost by minimizing corrosion and abrasive wear, by improving lubrication. Small gear pumps usually operate at a speed between 1,700 rpm and 4,500 rpm, and larger models most often. The design of the internal gear pumps, series qxeh, is completely focused on high customer benefits. Some internal gear pumps have an additional, crescentshaped seal shown above, right. Internal gear typical internal gear or gear withina gear technology was invented in 1902 by the founder of viking pump, which is the worldleading provider of internal gear process pumps. What is positive displacement pumps types and advantages. An internal gear pump works on a similar principle except the two linking gears sizes are different with one revolving within the other. This technology offers an exceptionally robust pump with the ability to work in extremes of temperature and with fluids containing particles in suspension. The pump head is now nearly flooded, just prior to forcing the liquid out of the discharge port.
Viking pump pump innovations in liquid handling since 1911. Internal gear pump with detail explaination and animation in this video, you will learn about an internal gear pump working process. Types of gear pump internal, external,gerotor, lobe pump. Both series are birotational unless outfitted with a relief valve and designed for direct drive at standard motor speeds, with modifications available for indirect drive. External gear pumps are costeffective displacement pumps. Liquid travels through the pump between the teeth of the gear withina gear principle. Gear pump is a robust and simple positive displacement pump. Tuthill miniature magnetically coupled pumps provide a leak free, precise, non pulsing flow for thin fluids.
One gear is driven by the motor and in turn moves the other gear. Useful information on gear pumps michael smith engineers. A different configuration of a split driveline pump is to have the gear. As the rotor orbits, the vanes trap fluid between the rotor and the casing, drawing the fluid through the pump. The viscosity range is between 0,2 mpas and 1 million mpas. Gear pumps are roughly classified into external and internal gear types. This pump principle features a compact design with particularly high energy density. An internal gear pump uses internal and external gears figure 2, below. The qx pumps are the 5th generation of bucher internal gear pumps, which have proven themselves in thirty years of service around the world. Types of gear pump internal, external,gerotor, lobe pump gear pumps. Liquid enters the suction port between the rotor and idler teeth.
254 322 1561 734 572 579 964 1539 299 475 3 1549 154 1552 549 1175 993 1195 1014 819 619 1307 861 545 1426 1037 427 162 305 27