The pump is so named because it has two gears that are sidebyside or externalto each other. Pdf an investigation of external gear pump efficiency and. External gear pump design, advantages and disadvantages. There are several gear pump pdf books available in market. In this video we are going to see how external gear pump works. This fine clearance is the main object of concern in this pump. The pump casing is an important part of the external gear pump and it plays a crucial role in determining the efficiency of the external gear pump. Parker gear pumps power dense design produces an energy savings and provides oems a marketable advantage to improve revenues.
Experimental study of the flow in an external gear pump by. The operating pressure of gear motors is usually quite low. The theoretical flow ripple of an external gear pump. External gear pump working animation with detail explanation. Internal gear pump with detail explaination and animation in this video, you will learn about an internal gear pump working process. External gear pumps are costeffective displacement pumps. However, the external gear pump uses two identical gears rotating against each other. Gear pumps are also widely used in chemical installations to pump high viscosity fluids. Pdf flow characteristics of external gear pumps considering. Gear pump working, construction, maintenance marinersgalaxy. 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. Gear pumps use the actions of rotating cogs or gears to transfer fluids. The qx pumps are the 5th generation of bucher internal gear pumps, which have proven themselves in thirty years of service around the world. The results of experimental determination of the actual flow rate external gear pump show that increasing pressure reduces the value of the actual flow rate and volumetric efficiency of the pump.
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. D series pump pump details magnetic coupled external gear pump nonpulsing flow positive displacement accurate leak free chemical resistant long life applications tuthill pump group specializes in oem applications. Gear pumps are invariably of fixed displacement type, which means that the amount of fluid displaced for each revolution of the drive shaft is. Operates a gear within a gear principle, whereby one gear the idler is positioned inside another gear the rotor. Our external gear pumps can be used in many various applications and industries. 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. Review different pump types commonly used understand the difference between centrifugal. The term positive displacement for gear pumps describes the fixed amount of fluid they move for each revolution. You receive the price of the configured external gear unit upon request. This nomenclature differen tiates it from an internal gear pump.
External gear pump design, advantages and disadvantages gear pumps are less expensive but limited to pressures below 140 bar. The fluid travel through the pump between the the teeth of the gearwithinagear principle. Hany ghoniem advisor associaje professor depanmenl ofmechanical engineering. Consult factory for other options and performance requirements. One gear is driven by a driver electric motor, and it in turn drives the other gear. Allowable radial shaft loads are a function of the load position, load orientation, and operating pressure of the hydraulic pump.
The pump is so named because it has two gears that are sidebyside or external to each other. The mechanism is usually driven by one of the toothed gears, which in turn drives the other. 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. The rotating gears develop a liquid seal with the pump casing and create a vacuum at the pump inlet. Nov 07, 2017 this video show how a gear pump works. Gear motors and axial piston motors are high speed motors.
External gear pump free download as powerpoint presentation. What is an external gear motor and why do you need it. External gear pump hydraulic pumps and parts dta hydraulics. Suction and delivery of this type of pump occurs due to. Useful information on external gear pumps what is an external gear pump. Pdf this article investigates the volume change law of trapped fluid in the meshing process and the flow characteristics of external gear pumps under. This is an example of a double multiple rotor pump. To reduce heat losses, rexroths external gear units offer very high efficiencies.
The straightforward and rugged construction guarantees long service life without the need for extensive maintenance. An external precision gear pump is usually limited to a maximum working pressure of 210 bars 21,000 kpa and a maximum speed of 3,000 rpm. End clearance is the closeness of the rotor gear to the head of the pump. An external gear pump uses two external gears figure 1, below that displace nonlubricating fluids gears are oil lubricated. Liquid enters the suction port between the rotor large exterior gear and idler small interior gear teeth. Internal gear pump working animation with detail explanation. One gear is driven by the motor and in turn moves the other gear. 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. A gear pump is a type of positive displacement pd pump. The paper presents a cfd model of an external gear pump. If your operation requires a lower speed, you can reduce the output speed of the shaft by using gears. Further configuration variants are given by different flanges, shafts, valve arrangements and multiple pump combinations. Some manufacturers produce gear pumps with higher working pressures and speeds but these types of pumps tend to be noisy and special precautions may have to be made. External gear pump overview michael smith engineers.
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. Hydac external gear pumps are also available as multiple pump combinations pge104. Eaton external gear pump gd5 series epugecc001e december 2014. 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. Two identical gears positioned side by side, rotating into one another. A vibrational study of gear pumps and gear pump drives. Displacement d the displacement of a rotary gear pump is the volume displaced during one complete. External gear motor hydraulic motors and parts dta hydraulics. Lunchbox sessions is a new take on online industrial training, full of interactivity, used by individuals, schools, and companies around the world.
Gear pumps are either external or internal based on their design and operation. It is noisy in operation than either vane or piston pumps. 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 vibrational study of gear pumps and gear pump drives matthew kulpa a thesis submiu.
In an internal gear pump fluid enters int the suction port between the rotor and idler it is a small interior gear teeth. Internal 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. Such a gear pump has a drive gear and a driven gear that are encased in housing with minimum clearance between the housing and the tips of the gears. It may be calculated from the physical dimensions of the gears, or it. You immediately receive a project drawing pdf format if a configuration already exists. The useful viscosity range of an internal gear pump is from 1cps to over 1,000,000cp. The casing of the pump is as important as the gear.
Available in four different sizes, with very narrowstage specific displacement flow and a large range of flange and shaft designs. However, an external gear pump uses two identical gears rotating against each other. There is no doubt that the geartype pump is the most widely used design in hydraulic systems. Scribd is the worlds largest social reading and publishing site. External gear pumps can come in single or double two sets of gears pump configurations with spur shown, helical, and herringbone gears. This is an animation video on the working of an internal gear.
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. This page will introduce you to gear pumps, applications that use gear pumps, and the use of powder metal for producing pump gears. External gear pumps are used in industrial and mobile e. The product range of bucher hydraulics includes single pumps 05100212212hp250hp300312hp corresponding with the common group denominations. The external gear pump efficiency can be increased by increasing the surface smoothness factor.
What is an external gear pump and why do you need it. External gear pumps utilize two identical gears with external teeth to generate flow. 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. Therefore, the design and performance analysis of the pump. The working principle of external gear pumps is very simple. To investigate the fluid flow phenomena that occur in external gear pumps, one of the commercial cfd software packages was selected. The 1p pumps are fixed displacement external gear pumps with axial clearance compensation. Aug 26, 2017 internal gear pump with detail explaination and animation in this video, you will learn about an internal gear pump working process. They give high volumetric efficiency even with high operating. Wellproven designs, the use of specially developed materials, constant testing and sophisticated mass production techniques ensure products of the very highest quality. A selected program of single and multiple pumps is available within 10 working days. Typical applications are lubrication pumps in machine tools, fluid power transfer units and oil pumps in engines.