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. Types positive displacement pumps a lobe pump a positive displacement pump causes a fluid to move by trapping a fixed amount of it then forcing displacing that trapped volume into the discharge. It moves a fluid by repeatedly enclosing a fixed volume using interlocking cogs or gears, transferring. Application pumps for lubricant liquids without any suspended solid or abrasive substance. Text headings in each module are linked to and f\ rom the table of contents for that module. Khalil encyclopedia of life support systems eolss 1. It delivers a smooth pulsefree flow proportional to the rotational speed of its gears. The flow output is uniform and constant at the outlets. Radial flow pumps and semiaxial flow pumps are the most common types used. This seal forces the liquid out of the discharge port. Pressure relief valves that are usually fitted to the delivery side of the pump to provide safety protection against high pressures also limit maximum pressures possible.
Mechanical pumps in mechanical pumps, the gas present in a vacuum system is transferred from a low pressure to a. The external gear pump is a positive displacement pd type of pump generally used for the transfer and metering of liquids. Rotor and idler teeth mesh completely to form a seal equidistant from the discharge and suction ports. Envirogears mission is to engineer the worlds safest and most reliable internal gear pumps by understanding our customers needs.
Pump 1 pump a small, electrically powered pump a large, electrically driven pump electropump for waterworks near the hengsteysee, germany. 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 positivedisplacement pump in which a discrete volume of fluid is trapped and then discharged. Rotary type, internal gear, screw, shuttle block, flexible vane or sliding vane. The range of hydraulic gear pumps is available in single or multiple pump format and can be supplied with integral relief valve. A pump is a device used to move fluids, such as liquids, gases or slurries. Rotary pumps positive displacement type chigh pressure, high efficiency dliquids must be free of solids. Group 2 gear pumps technical information total hydraulics bv.
Review different pump types commonly used understand the difference between centrifugal pumps and positive displacement pumps understand the working principle of the tuthill. Iom ebsray helical gear reducers 222002 gb4, gb5, gb6. They are one of the most common types of pumps for hydraulic fluid power. Fundamentals of fluid mechanics chapter 12 pumps and turbines. Pumps and pumping system bureau of energy efficiency 1 syllabus pumps and pumping system. These variabledisplacement pumps feature with several types of mechanical, hydraulic and electrohydraulic servo valve controls which permit easy field interchangeability.
This pump type is incredibly versatile and can efficiently handle high viscosity fluids at moderate speeds. In the previous article we learned about the various characteristics, main parts and special features of the rotary pumps. A gear pump uses the meshing of gears to pump fluid by displacement. Sauerdanfoss high performance gear pumps are fixed displacement pumps which consist of. Each time the pump spins, a specific amount of water is moved. Types of gear pump internal, external,gerotor, lobe pump.
Rotary vane pumps similar to scroll compressors, these pump have a cylindrical rotor encased in a similar shaped housing. Gear pumps are available in two mounting configurations. Again, it can be regarded as a portion of a helical gear with infinite radius. We will also learn how is the working of screw pump different from that of other types of pumps. In a centrifugal pump, a rotating impeller imparts energy to the liquid moving through the pump. Types, performance evaluation, efficient system operation, flow control strategies and energy conservation opportunities 6. This document has been reproduced directly from the best available copy. Gear pumps are a type of pump used to transfer liquids from one location to another. A positive displacement pump can be further classified according to the mechanism used to move the fluid. Hydraulic pumpmotor division positive displacement pumps fixed displacement flow varies only with shaft speed typical types gear pumps and vane pumps variable displacement flow can be varied at a given shaft speed typical type is variable piston pumps hydraulic pump basics. Rugged and tough, the pvwc line offers low horsepower for highperformance applications. They are one of the most common types of pumps for hydraulic fluid power applications gear pumps are also widely used in chemical installations to pump high viscosity fluids. In the crescenttype internal gear pumps the difference between the number of teeth of the. The double helical form balances the inherent thrust forces.
The close tolerance between the gears acts as a seal between the suction and discharge ports. Flow friction head sometimes called dynamic head loss is the friction loss, on the liquid being moved, in pipes, valves and equipment in the system. External gear pumps can come in single or double two sets of gears pump configurations with spur shown, helical, and herringbone gears. They are a positive displacement pump, meaning they provide a fixed flow rate regardless of pressure changes within the system. Pumps and pumping system bureau of energy efficiency 115 figure 6. As the rotor orbits, the vanes trap fluid between the rotor and the casing, drawing the fluid through the pump. Our gear pumps have a sturdy design, offering high reliability as well as long life. Mechanical engineering types and performance of pumps and compressors essam e. Gear pumps can be either external or internal and vary in design and operation. They are also used for chemical transfer, dewatering underground coal mines, food manufacturing or where the liquid being pumped has a high solids. Global provider of innovative, highquality industrial gear pumps. For standard multiple pumps, see multiple pump technical manual. Useful information on gear pumps michael smith engineers. This is a linear shaped gear which meshes with a helical gear.
Double helical gear this is a gear with both lefthand and righthand helical teeth. They are one of the most common types of pumps for hydraulic fluid power applications. There are two types of gear pumps external gear pumps and internal gear pumps. Pdf gear pumps represent the majority of the fixed displacement machines used. When using equivalent pump speeds, gear pumps have comparable shear imparted compared to progressive cavity pumps.
In this article we will learn about the working of various types of rotary pumps, i. Mukesh sahdev, associate content writer presented at the chemical engineers resource page. Bushings are made of galgech lowfriction and highresistant aluminium alloy and manufactured from diecasting that have excellent high strength and antifriction. This portable document format \pdf\ file contains bookmarks, thumbnails, and hyperlinks to help you navigate through the document. Troubleshooting guide troubleshooting guide part 1 problem possible cause corrective action no discharge. Inlet and outlet nozzles are aligned with same diameter. Outlet inlet lowpressure fluid highpressure fluid fluid carried between teeth and case pfigure 2. Centrifugal pumps the centrifugal pump produces a head and a flow by increasing the velocity of the liquid through the machine with the help of a rotating vane impeller. What links here related changes upload file special pages permanent link page information wikidata item cite this page. With three capacities per single frame size, pvwc pumps allow users to select their required level of capacity and pressure while. External gear pump overview michael smith engineers. Rotary positive displacement pump can be classified into two main types. Airoperated and mechanical as the name suggested, airoperated diaphragm pumps aka aod pumps or aodd pumps are powered solely by air making them suitable for dangerous and tough environments.
Centrifugal pumps are the most common type of pumps found in doe facilities. Gear pump applications top dealer of pumps and related. Factory set gear pumpheads overview of gear pumps flow rates and models flow rates mlmin bar model page min. Different demands on a centrifugal pumps performance, especially with regard to head, flow, and installation, together with demands for economical operation, are only a few of the reasons why so many types of pump exist. The gear pump was invented around 1600 by johannes kepler gear pumps are also widely used in. Centrifugal pumps enjoy widespread application partly due to their ability to operate over a wide range of flow rates and pump heads. The modules listed in the overview are linked to the corresponding pages.
Iom ebsray model hd600 noncartridge type 153307 hd600 noncartridge type pdf. Pedestal pumps are ideal for reducedspeed applications such as with viscous fluids or to meet specific flow requirements. Iom ebsray lpg control panel model l86110101a16 l86110101a1. Because of this action, positive displacement pumps are capable of delivering constant flow at very high pressures at a constant speed. Topgear when reliability is the priority gear pumps are used in all types of manufacturing industries for the transportation of both thin and thick liquids, from chocolate to diesel fuel. A pump displaces a volume by physical or mechanical action. Gear pumps a simple type of rotary pump where the liquid is pushed between two gears. Basics concepts of operation, maintenance, and troubleshooting, part i by. It moves a fluid by repeatedly enclosing a fixed volume using interlocking cogs or gears, transferring it mechanically using a cyclic pumping action. A gear pump is a type of positive displacement pd pump. Versatility in handling low viscosity and high viscosity liquids, e.
808 946 1349 913 1400 1316 1090 1260 49 11 1358 52 923 303 832 779 1480 1015 846 72 389 319 883 1238 249 808 985 1392 134 1115 1128 1227 1121 1085 1303 1123 800 1426 1229 39 1149 64 527 1311 1292 626