An air filters remove solid particulates such as dust, pollen, mold, and bacteria from air. Air filters are used in applications where air quality is important, such as in internal combustion engines, gas compressors, diving air compressors, gas turbines and others. The air intakes of internal combustion engines and compressors tend to use either paper, foam, or cotton media.
Automotive cabin air filters
The cabin filters are a pleated-paper filter that is located in the outside-air intake for the vehicle's passenger compartment. Some filters are rectangular. Others are shaped to fit the available space of the vehicles' outside-air intake. This filter is often overlooked by owners. Clogged or dirty cabin air filters can reduce airflow from the cabin vents, as well as introduce allergens into the cabin air.
Internal combustion air filters
3 Circular Saw
The air filter prevents abrasive like dirt from entering the engine's cylinders that would cause engine wear and oil contamination. Most fuel injected cars use a pleated paper filter that looks like a flat panel. This filter is placed inside a plastic box connected to the throttle body between the intake tube. Older vehicles use carburetors or throttle body fuel injection sometimes use a round air filter, usually a few inches high and between 6 and 16 inches round. It is usually located directly over the carburetor or throttle body and secured with a metal or plastic lid.
Paper
Pleated paper filters are the preferred choice for automobile engine air filters, because they are efficient, easy to service, and inexpensive. The "paper" , as the filter media are considerably different from other papers.
Foam
Oil-wetted foam filters are used in some replacement air filters. Foam was used in air cleaners on small engines and other power equipment, but cars paper filter media has since replaced oil-wetted foam filters. An oil-wetted foam filter can offer minimal airflow restriction or high dirt capture, which makes this type the choice in off-road vehicles and other motorsport that encounter high dust levels.
Cotton
Oiled cotton gauze is employed in a small number of aftermarket automotive air filters marketed as high-performance items. In the past, cotton gauze saw limited use in original-equipment automotive air filters.
Oil Bath
An oil bath air cleaner is a round base bowl containing a pool of oil, and a round insert which is filled with fibre, mesh, foam, or another coarse filter media. When the cleaner is assembled, the media-containing body of the insert sits a short distance above the surface of the oil pool. The rim of the insert overlaps the rim of the base bowl. This arrangement forms a labyrinthine path through which the air must travel in a series of U-turns: up through the gap between the rims of the insert and the base bowl, down through the gap between the outer wall of the insert and the inner wall of the base bowl, and up through the filter media in the body of the insert. This U-turn takes the air at high velocity across the surface of the oil pool. Larger and heavier dust and dirt particles in the air cannot make the turn due to their inertia, so they fall into the oil and settle to the bottom of the base bowl. Lighter and smaller particles are trapped by the filtration barrier in the insert, which is wetted by oil drops aspirated by normal airflow.
Oil bath air cleaners were very widely used in automotive and small-engine applications until the widespread industry adoption of the paper filter in the early 1960s. Such cleaners are still used in off-road equipment where very high levels of dust are encountered, for oil bath air cleaners can sequester a great deal of dirt relative to their overall size, without loss of filtration efficacy or airflow. However, the liquid oil makes cleaning and servicing such air cleaners messy and inconvenient, they must be relatively large to avoid excessive restriction at high airflow rates, and they tend to increase exhaust emissions of unburned hydrocarbons due to oil aspiration when used on spark-ignition engines.
References from Wikipedia, the free encyclopedia.
Cyber Monday Makita 3 3/8 inch Circular Saw SH01W Lithium-ion (bare tool - saw only) 2011 Deals
Dec 07, 2011 02:08:40
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