The pump shaft packing is worn out tighten gland bolt maintenance replace gear pump repair gear pump pressure too low, output quantity too low the gear pump is worn replace gear pump repair gear pump does not turn hot melt material too cold adjust temperature observe the material manufacturers msds or material information sheet temperature. The gears are supported by bearings in both side of the gear shaft. If the first pump is driven through a dog and center coupling or. E n g i n e e r i n g gear pump basics the external gear pump is a positive displacement pd type of pump generally used for the transfer and metering of liquids. Hydraulic gear pump and motor failure analysis and repair guide page 3 of 32 alamo industrial 1502 e walnut st, seguin, tx 78155.
Haight pump prides itself on its outstanding lead time and quality customer service. Figure 1 shows a crosssectional view taken through the gears of a typical gear pump. External gear pumps egps have gained popularity among applications in many fields like fluid power transmissions and systems, automotive, aerospace thanks to their advantage of simplicity. Tandem and multiple pumps are available worldwide in more than variants. 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. The key task of external gear units is to convert mechanical. As a chemical engineering intern over the 20112012 summer i was exposed to a number of different pumping mechanisms. There are several gear pump pdf books available in market. External gear pumps can come in single or double two sets of gears pump configurations with spur shown, helical, and herringbone gears.
The 1p pumps are fixed displacement external gear pumps with axial. It takes into account the most important phenomena involved on the operation of this kind of machines. Hydac external gear pumps are also available as multiple pump combinations pge104. Type 1 outrigger bearing, the pressure restrictions for both pumps are as indicated in the diagram. All liquiflo gear pump models are available in closecoupled configuration. 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. This is a common kind of pump that is mostly used in the applications of hydraulicfluid power. Gear pumps galtech group 2 start pumps 12 tooth gears and consequent decrease in noise levels. Advantages and disadvantages of external gear pump. In most cases, each pump is isolated from its neighbour, i. 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.
Fluid shall be carried between gear teeth and shall be displaced when the gear teeth mesh. Gear pumps are positive displacement pumps, meaning they use expanding and contracting chambers to move fluids at a fixed rate. Figure1 control volumes defined in the fluid dynamic model. To reduce heat losses, rexroths external gear units offer very high efficiencies.
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. The product range of bucher hydraulics includes single pumps 05100212212hp250hp300312hp corresponding with the common group denominations. 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. Further configuration variants are given by different flanges, shafts, valve arrangements and multiple pump combinations. As the process fluids i was dealing with were of high viscosity, the most common pumping system i came across was the gear pump. 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. Experimental study of the flow in an external gear pump by. External gear pump working animation by basic engineering. External gear pump free download as powerpoint presentation. Displacement d the displacement of a rotary gear pump is the volume displaced during one complete. The theoretical flow ripple of an external gear pump. The qx pumps are the 5th generation of bucher internal gear pumps, which have proven themselves in thirty years of service around the world. Over half a century of excellence in designing and manufacturing internal gear pumps, external gear pumps, and positive displacement pumps for the oem and process market.
I mean because of the close clearance between the casing and the teeth of the gears, pressure is developed and we get the pressurized fluid at the end. Rexroth external gear pumps are available as standard gear pumps in. The external gear pump consists essentially of a pair of gears supported in bearing. Liquiflo gear pumps are available with several ancillary options and accessories. Section 4 reports the simulation results and campares them with those in 7.
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. In this video we are going to discuss construction and working of external gear pump. This nomenclature differentiates it from an internalgear pump, which has one gear. The straightforward and rugged construction guarantees long service life without the need for extensive maintenance. Inspect bearings each gear is supported by a shaft which has bearings on either side of the gear. Each individual pump is preset for rear connection to one or more pumps by interposition of the appropriate coupling flange. Rexroth external gear pumps are available as standard gear pumps in the 4 series of b, f.
We frequently build and assemble pump unit assemblies, or skids as they are sometimes called. External gear pump uses two external helical gears. Precise by design, they deliver accurate and repeatable performance, a smooth flow and a pressure up to 18 bar 260 psi. Gear pump working, construction, maintenance marinersgalaxy.
Comparing 4 types of pd pumps the printed version of this article appeared as, selecting positive displacement pumps. Scribd is the worlds largest social reading and publishing site. Summary a model for the prediction of the dynamic behaviour of external gear pumps is presented. They give high volumetric flows even with high operating pressures, a low noise level, and they have a high endurance thanks to the balancing system of the loads on the guide bushings. It may be calculated from the physical dimensions of the gears, or it. Our external gear pumps can be used in many various applications and industries. The internal gear pumps are available in various sizes and pressure levels from 3. A study on the internal fluid dynamic of a highpressure external gear pump is described in this paper. Azpf and azpn external gear pump bosch rexroth usa. Pdf an investigation of external gear pump efficiency and. This fine clearance is the main object of concern in this pump. These include temperature control jackets, gear reducers, variable speed drives, air motors, relief valves, repair kits, replacement cartridges and base plate mounting. Two main sources of noise and vibration can be considered. This page will introduce you to gear pumps, applications that use gear pumps, and the use of powder metal for producing pump gears.
The fluidotech fg100 series, born from the solid experience in mag drive gear pumps, is a smart and compact pumpmotor unit. The theoretical flow ripple of an external gear pump article in journal of dynamic systems measurement and control 1253 september 2003 with 415 reads how we measure reads. Bosch rexroth has been involved with the design, development and manufacture of gear. These need to be regularly checked for wear as they are what maintain the balance of the gears. Modeling and simulation of gear pumps based on modelicamworks.
The pump has been analyzed with both numerical and experimental techniques. Our internal gear pumps are characterised by extremely low noise levels, low pulsation and a very large speed range. The fluidotech fg200300400 series, born from the solid experience in mag drive gear pumps, is a. Flange and cover in aluminium or on request, cast iron. Pdf this article investigates the volume change law of trapped fluid in the meshing process and the flow characteristics of external gear pumps under. Specifically, they are rotary positive displacement pumps, which utilize a rotating mechanism or assembly to cause this contraction and expansion. The casing of the pump is as important as the gear. The term positive displacement for gear pumps describes the fixed amount of fluid they move for each revolution. In this, one gear is driven by the prime mover and drives another gear. 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. A flow of oil is produced by the pump due to this rotation. External gear pump overview michael smith engineers.
A gear pump is a type of pump that uses a network of gears to draw fluids by displacing them. Gear pumps are wellsuited to tandem combinations of pumps in which the drive shaft of the first pump is extended to drive a second pump, and sometimes a third pump in the same manner. External gear pump series g azpg22 fixed pumps v 22. Review different pump types commonly used understand the difference between centrifugal pumps and positive displacement pumps understand the working principle of the tuthill.
Available in four different sizes, with very narrowstage specific displacement flow and a large range of flange and shaft designs. Market gear pump 0 group motor reference lab e bfback inlet and front out. They typically consist of a northern heavy duty gear pump, electric motor, shaft coupling, and coupling guard, mounted on a unit base. Gear pump components pump unit assembly northern pump is a full service gear pump manufacturer. One rotor of internally cut gear teeth will mesh with one externally cut gear. The volumetric, mechanical, and overall efficiencies of a variety of. To return to this page, please click on the red text in the top corner of each page. This paper presents an experimental study of external gear pump efficiency based upon an analysis of the stribeck values. The pump is used in chemical installation that is used to draw or push the fluids having high viscosity. Pdf study of a highpressure external gear pump with a. The pump is so named because it has two gears that are sidebyside or externalto each other. Pdf flow characteristics of external gear pumps considering. The pump housing is in stainless steel aisi 316l, while gears and bushings fg200300400 series pumpmotor unit.