This fluid coupling would capture the mechanical power from the main source, namely the i. The operation of a fluid coupling is based on hydrokinetic principles and requires that the output speed be less than the input. The output coupling loop offers production to cavity resonator which in turns connected to a revolution guide. If a module a interacts with a module b, there is a certain dependency between these modules. Magnetron working structure and functioning scoopak. Hydrokinetic drives, hydraulic torque converters and. Fluid coupling type t is the basic version of constant. The efficiency of the power transmitted by fluid coupling is about 98%. Fit fluid coupling on motor shaft by using a threaded bar as shown on figure 2 and using two wrenches hold wrench a and turn wrench b to draw the coupling on the motor shaft. Feb 26, 2016 efficiency in actual prectice, the speed of driven shaft is always less then the driving shaft by 2% to 4% due to friction and turbulence loss in the impeller and runner passage, which is known as slip. Dec 26, 2017 oil flow circuit diagram of variable speed fluid coupling or scoop coupling.
Experimental research on fluid coupling flexible actuator. Mar 12, 2014 elecon working principle of scoop controlled variable speed fluid coupling. If one of these assumptions is not true anymore because b. Scoop trim coupling basic scheme of fluid coupling pump runner. It also has widespread application in marine and industrial machine drives, where variable speed operation and controlled startup without shock loading of the power transmission. The torque converter is the basic unit, with the coupling and brake being special cases. At the same time, the fluid coupling protects the drive system to the maximum degree, even under extreme operating conditions, against damage and this reduces downtimes. Output is achieved with minimal mechanical wear as there is no mechanical contact between. The energy through the incompressible fluid in the chamber drives silicone diaphragm moving up and so that forms the ability of displacement output. The runner is connected to the driven machine or load which is pulley via gearbox in. The trip stop command to ht motor conveyor will act into scoop coupling control panel. In fluid coupling the driven shaft is free from engine vibrations. Thousands of variable speed fluid couplings in pump and. Elecon working principle of scoop controlled variable.
A further range has been created by the addition of other parts to this basic type. When for example a uses a certain functionality of b, then a depends on b. The quantity of oil in the coupling cell is adjusted through an electrically actuated scoop tube. The fluid coupling has an advantage over the mechanical coupling in the following areas. Pdf hydraulic analysis of a reversible fluid coupling. A gear coupling is a mechanical device for transmitting torque between two shafts that are not collinear.
The shell and the vanned outer wheel forms the working chamber. The voith turbo coupling is a hydrodynamic coupling based on foettingers principle. Peikert regional manager voith transmissions, incorporated houston, texas gunther h. The mass forces are transmitted via a flowing fluid e. To connect the servomotor used in nc machine tools with the ball screw, an exceptional usage of the coupling as shown in the. In the next quick tip, well discuss the principle of encapsulation and why it helps with creating maintainable code. Using the hydrodynamic principle, a fluid flow transmits. The voith vehs electrohydraulic actuator ensures that the scoop tube is set fast and in a stepless manner. Variable speed fluid coupling scoop coupling assembly. It follows that output torque must always equal to input torque applied to the coupling. Idespread interest in hydraulic drives was created in this country when hydraulic couplings were incorporated in several popular automo biles. Electric motor characteristic curves with and without fluid coupling.
Fluidomat sc consists of a fluid coupling housed in a selfsupported stationary housing having a. The working part of the coupling consists of two elements, one impeller connected to the prime mover usually an electric motor, the second one runner connected. To install ksd or cksd fluid coupling, the motor shaft may need to be threaded. A fluid coupling is a hydrodynamic device used to transmit rotating mechanical power. Its working principle is on the basis of the connection between electron flow and industry that is magnetic. Coupling is the principle of reducing how objects directly affect the states and behaviors of other objects. The sliding scoop tube in this types of coupling governs the oil level in the working circuits depending on scoop tube position between 0% to 100%. Based on the recommendations from the computational study a conventional fluid coupling with one driver shaft and one driven shaft was fabricated and tested. Flender fludex couplings from siemens are hydrodynamic fluid couplings operating according to the fottinger principle.
Jul 24, 2010 fluid coupling, the principles of operation department of defense 1954 pin 29877 component parts demonstration of fluid coupling with the use of a plastic model in operation and a truck in. The basic principle of operation for hydraulic coupling, irrespective of manufacturer is as follows. The oil may be pumped back into the coupling when needed, or some designs use a gravity feed the scoop s action is enough to lift fluid into this holding tank, powered by the coupling s rotation. When selecting a drive unit for yoc z acceleration type coupling, first divide the rated speed n t of working machine by the hydraulic efficiency. Operating at stepless output rotating speed, the fluid coupling for motordriven boiler feed pump is provided with a scoop tube. Material flexing couplings do not require lubrication, with the exception of grid couplings. In drives consisting fluid couplings, there is no mechanical contact between the driver. Variable speed hydraulic coupling and drive unit of hydraulic coupling. An antenna is linked up to a revolution guide to extract a part of the field. Its main components are two bladed wheels a pump wheel and a turbine wheel as well as an outer shell.
The geared variable speed coupling combines a hydrody. Fluid coupling working principle advantages of fluid. Hydraulic machines fluid coupling, fluid torque converter. Reliable speed control geared variable speed couplings. Constantfilled fluid coupling with valve control types tvf.
Efficiency in actual prectice, the speed of driven shaft is always less then the driving shaft by 2% to 4% due to friction and turbulence loss in the impeller and runner passage, which is known as slip. How the air compressor works types of air compressors. Therefore, efficiency equals 100% minus the percent of slip. Constantfilled fluid coupling with valve control types. The pembril sdfc fluid coupling when used in conjunction with a. This principle states that the sum of moments with in the fluid coupling system must equal to zero. Since 1968, he has as sumed several international assignments.
A scoop controlled fluid coupling has a toroidal working circuit w defined by vaned impeller and runner elements 11,12. Fluid coupling, the principles of operation youtube. The inclusion of scoop type fluid coupling prevents such situation. This design utilizes a single piece of material and becomes flexible by removal of material along a spiral path resulting in a curved flexible beam of helical shape. A fluid coupling or hydraulic coupling is a hydrodynamic or hydrokinetic device used to transmit rotating mechanical power. Further, this principle provides that the output torque is equivalent to the input torque. The two joints are connected by a third shaft, called the spindle.
Assembly of fixed speed constant fill type fluid coupling, basic working principle of fluid coupling. Design and analysis of driven shaft for hydraulic coupling. The twosplit portion of the sleeve are clamped together using nuts and bolts. Fluid coupling working principle as the electric motor accelerates to the running speed, the impeller begins to centrifugally pump oil to the stationary runner.
The material flexible types obtain their flexibility from stretching or compressing a resilient material, such as rubber, or from the flexing of thin metallic discs or grid. The piezoelectric oscillator driven by alternating voltage provides reciprocating bending deformation. The geared variable speed coupling controls the speed of the driven machine precisely, quickly and repeatably. It will empty the oil from working circuit of the scoop type fluid coupling and thereby no mechanical connection between motor and rest of the conveyor. Operating principle the hydraulic coupling is equivalent to a combination of centrifugal pump and hydraulic turbine, the hermetic working chamber formed between the pump impeller centrifugal pump and. Design and mathematical modeling of fluid coupling for.
A makes the assumption that b provides a certain service, and moreover it makes assumptions on how this service can be used by which mechanism, which parameters, etc. Working principle of a scoop coupling scoop coupling consists of two power transmitting elements called impeller and runner, both having a large number of straight radial vanes in a conveyor system the prime mover motor drives the impeller. Input powers from 1 to 30 mw and output speeds of up to 20 000 rpm are possible. While there are compressors that use rotating impellers to generate air pressure, positivedisplacement compressors are more common and include the models used by homeowners.
Construction, working, operation and maintenance of fluid. Elecon working principle of scoop controlled variable speed fluid coupling. Introduction of fluid coupling a fluid coupling is a hydrodynamic coupling bases on foettinger principle. The fluid coupling allows the motor to reach 8085% speed in a few seconds shift from point a to point b where it meets the stall curve of the fluid coupling slip100%, the point of maximum motor torque. Construction, working, operation and maintenance of fluid couplings.
Elecon working principle of scoop controlled variable speed. The principle the geared variable speed coupling combines a hydrodynamic variable speed coupling and a mechanical gearbox in one compact unit. Working liquid is supplied to the working circuit w from a rotating reservoir 9 by an adjustable scoop tube 15 having a scooping orifice 16, the radial position of which is to determine the degree of filling of the circuit w. By moving this scoop, either rotating it or extending it, it scoops up fluid from the coupling and returns it to a holding tank outside the coupling. Hydraulic systems 3 toro university technical training hydraulic leverage if we take the concept discussed on the previous slide and use containers or cylinders of different sizes, we can increase the mechanical advantage to lift a heavier load. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext.
It also has widespread application in marine and industrial machine drives, where variable speed operation andor controlled startup without shock loading of the power. Hydrodynamic coupling turbo coupling, flow coupling, fluid coupling hydrodynamic brake retarder, flow brake in honor of hermann fottinger as their inventor, hydrodynamic power transmitters are also referred to as fottinger units. The elecon variable fill scoop fluid coupling is therefore located between a constant speed. Difference between flexible and rigid grooved couplings.
In waveguide couplers, where coupling between main and auxiliary line is accomplished through holes or slots, vswrcanbeheldtoverylowlevels,oftennogreaterthan that resulting from a typical flange mismatch. A beam coupling, also known as helical coupling, is a flexible coupling for transmitting torque between two shafts while allowing for angular misalignment, parallel offset and even axial motion, of one shaft relative to the other. These speed signals are compared and produce a control signal used to position the scoop tube to obtain the desired pump speed. The components performing this function are discussed in the paragraphs which follow. Working principle d riving and driven shafts are not mechanically connected so the power transmission is proportional to the fill level in the working circuit. The coupling can control the scoop tube through an electric. Jun 22, 2017 fluid coupling main parts, principle, working and application june 22, 2017 december 26, 2018 pankaj mishra 5 comments automobile fluid coupling is also known as hydraulic coupling is a hydrodynamic device which is used to transfer rotational power from one shaft to another by the use of transmission fluid. Dec 15, 2017 fluid coupling working principle as the electric motor accelerates to the running speed, the impeller begins to centrifugally pump oil to the stationary runner. Coupling helps to create code that is easier to read as well as easier to change.
Elecon fluid coupling operales on the hydrokinetic transmission principle. And worked for five years in the re search department for hydrodynamic. The voith turbo fluid coupling type t basic design, shown in above figure, consists of a few main components without additional adjoining storage chambers. Point c is the point of functioning of the fluid coupling after the motor has reached operating speed. The coupling shown in the diagram on the right above is suitable for use in cases subject to great radial loads. Fluid coupling main parts, principle, working and application june 22, 2017 december 26, 2018 pankaj mishra 5 comments automobile fluid coupling is also known as hydraulic coupling is a hydrodynamic device which is used to transfer rotational power from one shaft to another by the use of transmission fluid. As such, it constitutes a safety feature protecting transmission components from damage due to overloas or shock. Turbine runner flow of oil to better understand what benefit a fluid coupling provides when connected between an electric motor and gear train, the speed and torque profile of the electric motor must be considered. As shown in above figure, power can be also transmitted from a motor a driver to a driven machine without direct operating principle using a pump, a turbine and associated piping. The working part of the coupling consists of two elements, one impeller connected to the prime mover usually an electric motor, the second one runner connected to the driven machine. The speed variation in variable speed fluid coupling scoop coupling is obtained by varying the oil filling in coupling through a sliding scoop tube when in operation. Working principle the working process of the prototype is as follows. Working principle of a scoop coupling the oil flow gives up power as it.
The operating principle of hydrodynamic couplings is based on the fottinger principle. Variable speed fluid couplings driving centrifugal compressors and other centrifugal machinery by gunther h. The magnetron is a vacuum tube that is utilized in the generation of a microwave oven of high drive. The single flexing coupling is for use in the case where shafts are supported by three bearings.
Its working principle is based on the interaction between electron stream and magnetic field. This is the principle that allows you to jack up a very. Variable speed fluid couplings driving centrifugal compressors and other centrifugal machinery 61 dampening of torque peaks and no harmonics from either side and thus, decreasing mechanical stress in the whole drive line disconnecting driven machine possible while driver keeps running. Oct 25, 2018 clamp coupling is the modified form of the muff coupling and also known as split muff coupling i. A fluid coupling is a rotating speed controller that is placed between the driver such as a motor and driven. The hydrodynamic principle of a fluid coupling makes it possible to gently accelerate driven machines and to transfer power in a wearfree manner.
The rigid couplings provide a completely rigid connection similar to traditional flanged, welded and threaded piping connections with the help of grip. Fottinger principle the fottinger coupling originally the operating principle of the fluid coupling is based on the hydrodynamic torque converter patented by hermann fottinger 1877 1945. Hydrokinetic drives, hydraulic torque converters and hydraulic couplings by nicholas a. The entire operating fluid in the coupling is at rest.
The tooth flanks and outer diameter of the external. Fluid coupling, the principles of operation department of defense 1954 pin 29877 component parts demonstration of fluid coupling with the use of a plastic model in operation and. Fluid coupling are supplied with thermal safety device as fusible plug for. Variable speed hydraulic coupling and drive unit of. The hydrodynamic principle of power transmission was.
General electric systems technology manual chapter 7. Since the scoop tube is used to scoop oil circulating at a high speed, the tube tip is made of a special alloy for higher erosion resistance. It consists of a flexible joint fixed to each shaft. While there are compressors that use rotating impellers to generate air pressure, positivedisplacement compressors are more common and include the. In this paper we explain operation principles of fluid couplings and the structure and features of the fluid coupling for electric motor driven boiler. It has been used in automobile transmissions as an alternative to a mechanical clutch. Design and analysis of driven shaft for hydraulic coupling by. Fluid couplings or hydraulic couplings work on the hydrodynamic principle. Hence on motor startup, a reduced coupling torque is transmitted, whilst simultaneously providing an unloaded motor start. Variable speed hydraulic coupling and drive unit of hydraulic. Determine the required minimum coupling rating as shown below. In coaxial couplers the proximity effects, end effects and capacitive effects from the coupling bars employed generally result in higher. Clamp coupling is the modified form of the muff coupling and also known as split muff coupling i.141 694 147 200 1333 815 1071 197 1046 352 1315 308 1211 1282 1410 1311 1352 718 1166 364 509 1200 31 1093 1315 206 1454 1008 502 647