While many pumps can be found on job sites there are two very general types of water pumps in the construction industry. Our gear pumps have a sturdy design, offering high reliability as well as long life. In order to be efficient, the pump has to provide simultaneously a finite pumping speed and compression. Centrifugal pump are most common type of pump used to move liquids through a piping system. Screw pumps are the only type of pumps which are different from other rotary displacement pumps because of the axial flow of the fluid through their pumping elements. Useful information on gear pumps what is a gear pump. Group 3 gear pumps technical information bibus hidrotos. Hydraulic pump motor 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. They add energy directly to a movable boundary, which imparts the energy to. The most common type of rotodynamic pump is the centrifugal pump figure 1. A wide variety of single and multiple configurations enables you to select the precise pump or combination best suited for your application. These pumps have a forged cylindrical outer barrel with a high rigidity that contains a singlepiece structure consisting of an. Useful information on external gear pumps what is an external gear pump.
Gear pumps allow differential pressures up to maximum 5. The fluid in screw pumps moves between the screw threads and is displaced axially as the screws rotate and mesh. They are a positive displacement pump, meaning they provide a fixed flow rate regardless of pressure changes within the system. Centrifugal pumps enjoy widespread application partly due to their ability to operate over a wide range of flow rates and pump heads. See product dimensional information page 35 for outline drawings of pumps and the. These types of pumps have gears in it which have the ability to provide pressure energy to the fluid in the pumps.
Hydraulic fluid is drawn into the input port of the pump and discharged from the output port. Types of pumps continued positive displacement pump. Fluid coupling, boiler feed pump, high pressure pump, carbon. They typically consist of a northern heavy duty gear pump, electric motor, shaft coupling, and coupling guard, mounted on a unit base. The external gear pump is a positive displacement pd type of pump generally used for the transfer and metering of liquids. Selfpriming pumps this type of pump does a good job as long as the supply of liquid. The main differences between the two types of gear pumps are the placement of the gears and where the fluid is trapped. System components product specification sheet hpto hydraulic gear pump spline shaft, type r. Fixed displacement, external gear pump designed for medium pressure applications. There are many cases where it is readily apparent what type of sealing method is appropriate to use for a pump application, but there are also those where it is not. Be sure the control rotation direction corresponds to the direction of the arrow marked on the pump before putting the pump into operation. Types and construction feature of reciprocating pump 2 1. Types of pumps pumps used in irrigation or aquaculture often are a form of the centrifugal pump. Pdf gear pumps represent the majority of the fixed displacement machines used for.
Two basic types of centrifugal pumps are horizontal and vertical. Sauerdanfoss high performance gear pumps are fixed displacement pumps which. Basics concepts of operation, maintenance, and troubleshooting, part i by. Group 2 gear pumps technical information bibus hidrotos. Screw pumps also falls in the category of rotary pumps and have the same mechanism and principle. Rotarytype, internal gear, screw, shuttle block, flexible vane or sliding vane, circumferential piston, helical. Different in design and application they each basically serve the same purpose, which is to move water from point a to point b. Gear pumps are positive displacement or fixed displacement, meaning they pump a constant amount of fluid for each revolution. For standard multiple pumps, see multiple pump technical manual. The 1p gear pumps can be installed with the shaft oriented in any position. This type of pumphead design has a seal plate mounted with a. Mechanical pumps in mechanical pumps, the gas present in a vacuum system is transferred from a low pressure to a higher pressure region. In the crescenttype internal gear pumps the difference between the.
In addition to imposing limits on the operational speed, in many cases, the bearings determine the maximum pressure the pump. We frequently build and assemble pump unit assemblies, or skids as they are sometimes called. Pump rotation is determined by standing over the motor, and. To operate in either direction, however they can only operate. Types, performance evaluation, efficient system operation, flow control strategies and energy conservation opportunities 6. This note is meant as a general guide or starting point to help decide what to use. Often, several different types meet the same service requirements. The gear pump is a precision machine with extremely tight fits and tolerances, and is capable of working against high differential pressures. Gear pumps superior engineering and low cost of ownership designed to reliably handle viscous fluids across a broad range of flows and pressures, flowserve gear pumps feature double helical, herringbone type gears. Useful information on gear pumps michael smith engineers.
It may be calculated from the physical dimensions of the gears, or it. These plants use double casing barrel type multistage pumps designed to be adaptable to highpressure and temperature specifications. Pumps and pumping system bureau of energy efficiency 1 syllabus pumps and pumping system. The rotating gears develop a liquid seal with the pump casing and create a vacuum at the pump inlet. Pdf flow characteristics of external gear pumps considering. It is necessary to vent the air from the delivery connection before operating it the first time.
Application note to the field sealing liquiflo gear pumps. The internal gear pump is exceptionally versatile and also capable of handling thick fluids. Put the standard centrifugal pump above the liquid, and problems can arise, as it does not have the ability to create a vacuum and prime itself. 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. The working principle of the external gear pump is illustrated in figure 1. The main differences between the two types of gear pumps are the placement of the gears and where the fluid is. Many external gear pumps use journal bearings to support the rotating shafts. A gear pump is a type of positive displacement pd pump. Fundamentals of fluid mechanics chapter 12 pumps and turbines. Operate by forcing a fixed volume of fluid from the inlet pressure section of the pump into the discharge zone of the pump.
Above represents performance wich can be expected from units incorporating flange flange port styles. Internal gear pumps are primarily used in nonmobile hydraulics e. These types of pumps are built as reciprocating, or as rotary machines. There are two types of gear pumps external gear pumps and internal gear pumps. Gear pumps are a type of pump used to transfer liquids from one location to another.
The volume is constant given each cycle of operation. The term positive displacement for gear pumps describes the fixed amount of fluid they move for each revolution. Should it pump the hole dry and air enter the pump, it will stop pumping and become airbound. A drive gear that is driven by a motor rotates an idler gear in the opposite direction. There are two main types of pumps used in the pumping of liquids, including water, namely. Gear pump components pump unit assembly northern pump is a full service gear pump manufacturer. Rotodel rotary gear pumps are useful for handling viscouse liquids i. When using equivalent pump speeds, gear pumps have comparable shear imparted compared to progressive cavity pumps. A centrifugal pump is a rotodynamic pump that uses a rotating impeller to increase the pressure and flow rate of a fluid friedrichs and kosyn 2000. In simple words, we can say that the gear pumps transfer the fluids from one part to another using gear mechanism. What is an internal gear pump and why do you need it.
Centrifugal pumps are the most common type of pumps found in doe facilities. In order for these bearings to work, a minimum speed is required depends upon pressure of the pump. Lowara is focused on producing high quality, reliable, costeffective pumping. A positive displacement pump can be further classified according to the mechanism used to move the fluid. Gear pumps can be either external or internal and vary in design and operation. The fact of the matter is that there are three types of problems mostly encountered with centrifugal pumps. Hypoid gear this is a deviation from a bevel gear that originated as a special development for the automobile industry. Abstract the paper comprises research results of the gear pump typical failures and their connection with. 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. Download the file data into the pump memory disconnect the pump from the pc carry out your application on.
For most highspeed gear couplings, an expensive filter and guard are needed for forced lubrication and oil recovery, but these are not required for formflex couplings. Your choice of pump is backed by more than 70 years of vickers engineering and manufacturing skill. In a rotodynamic pump, a rotating impeller imparts energy to the fluid. Many factors go into determining which type of pump is suitable for an application. Power is applied to the splined center shaft thus turning the gears. Gear pumps use the actions of rotating cogs or gears to transfer fluids. 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. Displacement d the displacement of a rotary gear pump is the volume displaced during one complete. Available in two styles the compact, closecoupled gmc and the stub shaft gms. Mukesh sahdev, associate content writer presented at the chemical engineers resource page. Internal and external gear pumps are the two basic types of gear pumps. It moves a fluid by repeatedly enclosing a fixed volume using interlocking cogs or gears, transferring it mechanically using a cyclic pumping action.
42 990 1109 1264 407 627 1397 340 1158 720 1320 1413 1225 903 809 1220 71 829 658 213 1380 28 1082 1103 279 1436 1124 1391 1043 924 579 372 261 1157 438 864 857 620 591 497 1065 581 939 1386 184 861 655 998 1232 163 274