Air Compressor

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Author: MJ Marks

There are many portable air compressors on the market today of varying sizes and power. And though they vary by size and power, they all work on just a couple of different technologies to generate air pressure.

Most air compressors work by what's called positive displacement. This is different from compressors that use rotating impellers to generate air pressure. Instead, air pressure is increased by reducing the size of the space that contains the air. Usually, this is done with a reciprocating piston.

Like a small internal combustion engine, a conventional piston compressor has a crankshaft, a connecting rod and piston, a cylinder and a valve head. The crankshaft is driven by either an electric motor or a gas engine. While there are small models that are comprised of just the pump and motor, most portable air compressors have an air tank to hold a quantity of air within a preset pressure range. The compressed air in the tank drives the air tools, and the motor turns on and off to automatically maintain pressure in the tank.

At the top of the cylinder, there is a valve head that holds the inlet and discharge valves. Both are simply thin metal flaps, one mounted underneath and one mounted on top of the valve plate. As the piston moves down, a vacuum is created above it. This allows outside air at atmospheric pressure to push open the inlet valve and fill the area above the piston. As the piston moves up, the air above it compresses, holds the inlet valve shut and pushes the discharge valve open. The air moves from the discharge port to the tank. With each stroke, more air enters the tank and the pressure rises.

Portable air compressors use a pressure switch to stop the motor when tank pressure reaches a preset limit, about 125 psi for many single-stage models. Most of the time, though, that much pressure isn't needed. Therefore, the air line will include a regulator that is set to match the pressure requirements of the tool being used. A gauge before the regulator monitors tank pressure and a gauge after the regulator monitors air-line pressure. In addition, the tank has a safety valve that opens if the pressure switch malfunctions. The pressure switch may also incorporate an unloader valve that reduces tank pressure when the compressor is turned off.

Many articulated-piston compressors are oil lubricated. The pistons have rings that help keep the compressed air on top of the piston and keep the lubricating oil away from the air. Rings, though, are not completely effective, so some oil will enter the compressed air in aerosol form. Having oil in the air isn't necessarily a problem. Many air tools require oiling, and inline oilers are often added to increase a uniform supply to the tool.

On the negative side, these models require regular oil checks, periodic oil changes and they must be operated on a level surface. While solutions to the airborne oil problem include using an oil separator or filter in the air line, a better idea is to use an oil free portable air compressor that uses permanently lubricated bearings in place of the oil bath.

Though many portable air compressors are similar, this should help you to understand some of the mechanical differences of the various types available.

Article Source: ArticlesBase.com - How Portable Air Compressors Work

You can seriously hurt someone with a Pneumatic Nailer and I would not hesitate to defend my home with one if it came down to it. If you think about it though, it is just air, compressed air. Amazing that air, coupled with a nail and a pump, can be such a powerful force. This all comes about with the use of an air compressor.

Air compressors come in many shapes, sizes and abilities. The most important factor in choosing an air compressor is to determine the maximum CFM (cubic foot/minute) the tools that you are using require. CFM requirements are tool specific, for example, a paint sprayer or framing nailer will require a much higher CFM than a brad gun or a trim nailer. An air compressor with a larger tank will typically have a higher CFM because basically there is more air available for the tool to use. More specifically, the CFM output is related to the pump size.

It is recommended that you purchase an air compressor with a CFM capacity of 25% greater than what you will need. The durability of the air compressor is directly related to how long the pump has to run to keep your pneumatic tool working. If you use an undersized air compressor for the type of tool that you have and the work that you are doing, you will reduce the life of the air compressor pump.

Here are a few things to consider before you purchase an air compressor:

• Oil-free versus oil lubricated - The oil lubricated air compressors need to be serviced regularly. They are more durable because of this regular servicing and perform better in a non-climate controlled environments such as a garage or when used outdoors in cold weather.
• Noise - Another difference between air compressors is the higher the rpm on the motor, typically, the noisier the compressor will be. Makita makes an air compressor that runs on a slower speed motor. They are the quietest air compressor available and have a capacity of 4.2CFMs. Noise quickly becomes important when you are listening to the pump turn on intermittently in your house.
• Rating CFM output - This difference is due to the location of the Rating Facility. An air compressor that is CFM rated at sea level will not have the same output if you take it up to say, Breckenridge, Colorado at 9,000 feet above sea level.
• Cooling capacity - Makita brand air compressors use cooling fins. These aluminum cooling fins wrap around the copper tube that connects the pump to the tank. The aluminum conducts the heat to the increased surface area that these fins provide, thus keeping your air compressor cooler and increasing its lifespan.
• Air Intake Filters - All air compressors have an intake air filter that must be kept clean or it will reduce the capacity of your pump. The air filters need to be changed regularly depending upon how often you use your air compressor. Follow the instructions on your specific brand to see how often the air filter needs to be changed on your compressor.

Here is a convenient chart of some common air tools and their CFM requirements.

As with all power tools, read the manual (yes, read it) for proper maintenance procedures to keep your tools running at their peak performance!

While many people may take their refrigeration system for granted, this, along with many hundreds of other applications that humans use on a daily basis use air compressors. Whether you are riding a bike and need to fill your tires with air from an air compressor or you're wondering why your refrigerator won't work properly, chances are that you'll need an air compressor to help you fix what's wrong. Although some thing are more easily fixed than others with an air compressor, and sometimes the whole system needs to be replaced.

But what exactly is an air compressor? An air compressor is actually just what the phrase states: a tank or amount of air that has been compressed that will be used for later use. This is exactly what many of the portable air compressors are for, actually. Portable air compressors will actually help you put air in your tires, inflate balloons, and even deliver oxygen right to your body! Many people actually take the application of using air compressors for granted, but when you are stranded on the side of the road with a flat tire, chances are that you'll be wishing that you had an air compressor or a whole other inflated tire.

Uses of Air Compressors

As previously mentioned, there are many uses for an air compressor that you may not have even thought of. On idea that was not mentioned, though, was scuba divers and air compressors. Air compressors are used to deliver scuba divers air and oxygen below sea level. Additionally, air conditioners that consumers use throughout the years utilize air compressors as their main source of energy as they cool down the space around them. These are only a couple of the uses that people have for air compressors. In an engine, air compressors are used in the heating and cooling systems. They are also used in large power plants to deliver energy to huge machinery.

Air compressors are definitely an underrated man-made piece of equipment that benefits a whole range of individuals. From portable air compressors to large-scale compressors, these are fantastic tools with many different uses!