A Gear Coupling is used to join two rotating shafts for efficient transmission of mechanical power. Elecon Brand Elecon Size to da N. For quantity and quality of grease, see tabulation page 5. Number of Employees 51 to People. In accordance with our established policy to constantly improve our products, these specifications are subject to change with.
|Published (Last):||9 November 2005|
|PDF File Size:||5.5 Mb|
|ePub File Size:||19.63 Mb|
|Price:||Free* [*Free Regsitration Required]|
As such, it constitutes a safety feature protecting transmission components from damage due to overload or shock. The fluid coupling permits the use of a squirrel cage induction motor with the attendant advantages of simplicity, ruggedness and low operating costs.
Torque transmitted is directly proportional to the amount of fluid in the unit and hence it is very simple, by varying the oilfill, to match the coupling to the exact requirements of the driven machine. It is possible also to fit a delayed filling chamber 23 to this assembly, communicating with the working ciruit by means of calibrated nozzles and retaining part of the fluid when the Fluid Coupling stops running.
At motor switch-on, only the fluid in the work circuit is active and the torque developed is low. During the start-up phase, fluid in the delayed filling chamber transfers progressively into the work circuit, increasing the amount of active fluid and hence the torque.
The motor thus starts under minimum load and the driven machine is brought up to speed smoothly. Different mountings are available, the type of coupling being chosen accordingly. This compact assembly features a hydrokinetic Fluid Coupling combined with a grooved pulley. The assembly is fitted on the motor shaft and requires no aditional support other than of the motor. The coupling is supported in position by the input shaft of the reduction gear or the machine.
Installation operations: 1 2 3 Check that the shafts are dead-centred. Fit the keys and grease the shaft. Fit the coupling on the motor shaft or driven shaft, as required, by means of a threaded rod and a plate Figure 1. Ensure that the plate is in correct position on the hollow shaft and not on the delayed filling chamber, which would otherwise suffer damage.
Fig 1 4 5 When the coupling is correctly in position, prevent any lateral displacement by fitting the retaining plate, TREP washer and lock nut Figure 2.
For the XR mounting, fit the flexible coupling boss on the motor shaft by means of a threaded rod and a plate as shown in Figure 1 for the traction coupling. Check that the end of the motor shaft does not knock against the traction coupling. Alignment Procedure: 1 2 3 Once the driven machine is mounted in its correct position, bolt it onto the bed-plate.
Fit the flexible components in the flexible coupling or the pulley belts in the case of a PH coupling. Place the electric motor close to the traction coupling in approximately the correct position.
For precise motor alignment, particularly with large motors, the use of adjustment screws with brackets attached to the bed-plate seeFigure 3 is recommended. Various possibilities exist for motor-Fluid Coupling alignmjent. No angle should be formed between them. The second condition is met if a flat rule laid against the external diameters of the half-couplings is perfectly flush with the surface of both. Greater accuracy of alignment can be achieved by using a dial gauge.
After tightening the motor holding-down bolts and the flexible coupling flange bolts, re-check the alignment. Fit the pulley belts untensioned by moving the two pulleys as close together as possible. Ensure that the two pulleys are parellel by means of a wire or a rule. Before tensioning the belts on the pulleys,trace two thin lines transversally on the back of one of the inside belts. These marker lines should be as far apart as possible. Progressively tighten the pulley belts, after rotating them during several period of one minute each.
For example:an initial distance of mm between the 2 marker lines will be increased by the tension to mm 0. This level should never be exceeded since overfilling may cause overpressure inside the coupling and damage to the seals. Aniline point Pour point Viscosity indext 0.
To determine the amount of oil required: Table 3. The co-efficient Kn corresponds to the nominal full load torque. Rotate the coupling clowly until the oil just comes up to the filling hole. This position must match the angle from top-dead-centre calculated by the method given above.
Replace filling plug and tighten. After removing the cause of the stall, a new fusible plug must be fitted and the coupling filled with clean oil as [per specifications. For industrial applications, the maximum temperature is fusible p[lug marked number 1. At that termperature, thye fusible plug melts, allowing the oil in the coupling to drain off and removing the load from the motor.
For applications with Diesel or Petrol engines, or in certain specific applications in industry, fusible plugs with a set melting point of are used fusible plugs marked number 2. Safety features Oil losses can be prevented by using a thermal trip plug fitted instead and in the place of the fusible plug. This device actuates a motor cut-out system or triggers a warming signal in the event of the oil in the coupling reaching the set maximum temperature.
In the event of activation, re-set the motor cut-out switch and fit a new thermal trip plug. It is preferable to refill the coupling with cold fluid to acoid downtime while the original cluid cools down.
Bearings are amply dimensioned. Seals are custom-built for our equipment and can withstand pressure of three bars. They are made of viton, ie, a material capable of withstanding cinstant temperatures of up to C. Nonetheless, periodic checks of the seals and the coupling alignhment are necessary. A programme of three-monthly checks, for example, may well prove suitable, depending on the duration and type of service involved.
The oil tightness of the filling plug and the Fluid Coupling can be checked by holding a clean sheet of paper some 10 cm from the coupling-any oil leaks will be shown up by this paper test. If the oil appears dark in colour and emits a semll of burning, this is due to overheating. The oil is liable to oxidize or acidify and must be replaced immediately. Coupling temperature depends on the local operating conditions frequency of startups, ambient temperatur,ect.
But in no case should it exceed 80C. Warning : Fusible plug should never be replaced by solid plugs or ordinary solder. This would demage the Fluid Coupling and invalidate warranty claims. Driven shaft fails to reach speed. Check oilfill, as per 2. The fusible plugs melt. Check the oilfill, as per 2. Veryfy power consuption by means of a double wattmeter.
Check alignment, as per 2. Check the coupling. Locate noise and vibration sources by ear or by means of sound measurement instruments. Check that holding-down bolts on motor, bed-plate and driven machine are correctly tightened. After checking points a,b and c, locate source of vibrations and eliminate cause.
After removing lock nuts and washers, use the special forcing-off bolt 48 to remove the coupling, having previously smeared the thread and end of the bolt with lubricant oil or grease. The special forcing-off bolt is supplied only on request. The same bolt can be used with the various XR and PH mountings, and for several sizes of coupling, as shown in the table below: Fluid Coupling Sizes Sizes Forcing-off bolt reference number Thread For Fluid Couplings of the and type, the coupling shaft bore tolerance F8 allows installation and removal to be carried out manually and this method must be employed.
All repairs must be done by qualified personnel working in a clean place. Dismantling: First remove the delayed filling chamber when fitted 23 byundoing the securing bolts To disconnect the chamber from its casing, insert and tighten the two bolts 25 in the two specially provided forcing-off holes.
Note relative position of the balance weights and remove bolts By means of the forcing-off holes drilled in the impeller flange, disconnect the impeller from its casing 4. In general, bearings 8 and 9 remain in position on the shaft.
If duie for replacement, they can be removed by means of bearing puller. Remove seals 7 and 29 taking great care not to damage the polished sealing surfaces on the shafts. Reassembly is carried out by reversing the order of operations. Certain precaustions must be taken: 10 Mating surfaces perticularly between chamber and casing and between casing and impeller, must be throughly cleaned with trichlorethylene to remove all traces of sealing compound.
Check that there is no damage to the polished section of the shaft where seal rings 7 and 29 are fitted. Fit the seal rings 7 and 29 in position by means of a press-fitting tool.
Fill the space between the two seal ring rims with grase. During the assembly of the impeller 2 and the casing 4 , the coupling serial numbers stamped on each of these components should be aligned for purpose of balancing.
Find the size and serial number of the traction coupling for which the spare is required. The serial number is stamped on the outside of the coupling, eg. Order the spare by quoting as follows : Ball Bearing, reference No.
Type CD consists of an impeller, driven by the motor and a runner, driving the output shaft, which together with a casing forms an oil tight unit. The working circuit includes a central "by pass" chamber which in conjunction with a baffle helps to limit the torque under conditions of high slip without sacrificing efficiency under normal running conditions. Type CDR includes in addition a delayed filling chamber attached to the casing and communicating with the working circuit by means of holes. This permits machines to start at reduced torque e. Type CDRP has an extra large delayed filling chamber. This allows low starting torques 1. Type CDRS has an extra large delayed filling chamber with controlled nozzles.
Centrifugal Pump Lexicon
As such, it constitutes a safety feature protecting transmission components from damage due to overload or shock. The fluid coupling permits the use of a squirrel cage induction motor with the attendant advantages of simplicity, ruggedness and low operating costs. Torque transmitted is directly proportional to the amount of fluid in the unit and hence it is very simple, by varying the oilfill, to match the coupling to the exact requirements of the driven machine. It is possible also to fit a delayed filling chamber 23 to this assembly, communicating with the working ciruit by means of calibrated nozzles and retaining part of the fluid when the Fluid Coupling stops running.
ELECON Fluid coupling manual