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20.11.2 Topping Up Systems Where the main problem is loss of oil by leakage or creep, it may be sufficient to set up a wick or drip feed to provide a small-scale supply.Wicks or pads consist of porous or permeable materials such as felt which transfer oil by capillary action to the bearing surfaces. The pads may form a path from a reservoir to the bearing or may simply contain a small initial oil fill to increase the quantity available and feed it slowly to the bearing. This latter approach is commonly used in small electric motors. Drip feeds consist of small reservoirs mounted above the bearing or gears and equipped with a feed tube with some form of flow regulation and usually a sight glass. They can be used to provide a much higher flow rate than a wick. 20.11.3 Centralized Total-Loss Systems Wick and drip feeds are examples of total-loss systems, in which no attempt is made to collect the oil after feeding it to the bearings or gears. Far more sophisticated total-loss systems can be used to supply oil or grease to a number of separate components. The requirements of centralized total-loss systems are basically very simple. A typical system consists of a reservoir, a single pump to pressurize a manifold, and a number of controllers, each regulating the feed to a single lubrication point. Alternatively, the flow to several lines may be controlled by a multipiston pump, in which individual single-cylinder piston pumps are operated by cams on a common camshaft immersed in the lubricant. The number of outlets can vary from one to several hundred. The main advantage of centralized total-loss systems is that they reduce the labor required where a large number of components need relubricating. They are also valuable where the lubrication points are not readily accessible. Their disadvantages are that they do not provide any form of cooling or removal of contaminants, and there is no recovery of used lubricant. 20.11.4 Oil Mist or Fog Systems One type of total-loss system which has become widely used in recent years is oil mist or fog, in which fine droplets of oil are carried by a stream of air from a reservoir to a bearing or gears. The mist or fog of oil in air is produced by passing the airstream through the reservoir at low speed and low pressure. The oil is usually formulated to have low surface tension. The resulting dispersion of oil droplets is passed through steel, copper, or plastic pipes to the vicinity of the lubricated component. Passage through fine nozzles, or reclassifiers, then increases the linear flow rate to something over 45 meters per second (m/s) and thus causes the oil droplets to coalesce, producing a flow of liquid oil to the lubrication point. Oil mist and fog systems have two advantages over other total-loss systems in that the oil supply rate can be very low, resulting in a clean system, and the airflow gives a significant amount of cooling. 20.11.5 Oil-Circulation Systems The most sophisticated centralized systems are those in which the lubricant is collected after use and returned to the reservoir for recirculation. The basic require-
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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ments of such a system are a reservoir, a pump, possibly a flow divider or proportioner, feed lines, and return lines. In practice a full-circulation system is likely to be more complex and to include many of or all the following components: Multiple or divided reservoirs Heaters Coolers Oil-level warning devices Full-flow filtration to protect the pump Bypass filtration Pressure switches and alarms Water separators Chip detectors Sampling points Sight glass Circulation systems give a high degree of control over the quality and quantity of oil supplied to each component, enabling the cleanliness and the temperature of the oil to be controlled. Their only disadvantage is their complexity and therefore their cost.
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