how rotary and reciprocative compressors work?
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For a rotary compressor,air passes through two meshing gears. As the gears rotate, the air passing to it is being compressed.\nFor a reciprocating compressor, the air is compressed in the cylinder by a piston.
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A turbocharger is an exhaust gas-driven compressor used to increase the power output of an internal-combustion engine by increasing the mass of oxygen entering the engine. A key advantage of turbochargers is that they offer a considerable increase in engine power with only a slight increase in weight.
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Perhaps you are familiar with a gear that has teeth on the outside and an internal gear that has teeth on the inside.  A spline can be used to transmit power from one shaft to another because the internal teeth of one shaft mate with the external teeth of the other.  The joint permits a limited amount of slack preventing unwanted side and linear forces to be transmitted while causing rotation of the second shaft.  This would be one way to couple a pump to a motor which are manufactured by separate companies.
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I have a heat pump system for my shop and my wife's craft room. My shop is on the first floor and her room is on the second floor. The HVAC contractor installed one outdoor compressor and one air handler. There are electrically controlled dampers in the supply and return air from each room. There are two thermostats and a microprocessor. The microprocessor controls the dampers and directs the heating (or cooling) to which ever room is calling for it.
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I'm not 100% familiar with this but this should be pretty close to the answer.  Simple/standard crane motors work by applying power first through a rotating steel shaft into a gearbox.  The gearbox allows the gearing ratio to be changed (to trade rotation speed for torque or torque for rotation speed).  Another steel shaft carries the power out of the gearbox, again through rotation, to a spindle (think big thimble) around which steel cable is wrapped.  So the motor rotates this spindle to wind in the cable or unwind the cable to lift things or lower things.\n\nHere is a good page on cranes:\nhttp://en.wikipedia.org/wiki/Crane_%28machine%29\n\nHere is a good page on motors:\nhttp://en.wikipedia.org/wiki/Electric_motor
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Check out this article on How Stuff Works for a more advanced explaination with images. \n\nhttp://auto.howstuffworks.com/turbo.htm
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Okay... If ur serious then I'm game!!  The piston is attached to the piston rod.  When the rod is pulled down by the crackshaft, kinda like bicycle pedals.. the piston draws air into the cylinder.  Then the crankshaft pushes the rod and piston up causing compression.  Then the spark plug ignites and blasts the piston and rod back down creating power.  Then the crankshaft pushes the rod and piston back up expelling the waste.  The piston is the 'plunger' of the system, kina like the black rubber plunger in a hypodermic needle.
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If the compressor is not SPECIFICALLY designed for compressing oxygen - then the answer is YES. For a compressor to be suitable for oxygen it must be of the "oilless" variety, rings, fittings, seals etc must all be made from "inert" components. Don't know what the piston sleeve would be made out of (stainless maybe?).\n\nOil / Grease is the big problem. High oxygen concentrations can cause spontaneous combustion of organic (carbon containing) materials - and the reaction is VERY fast and hot!
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All Pneumatic tools are powered by an air compressor, much like the tools powered by other sources like electricity, gas, etc.
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simple the mecanic puts the air mesuring divice on the oil or water opening and seals it then puts in air presure and then waits a bit and checks the air presure so it works like a tire gage. if the air presure goes down then it it is leaking.
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"Centrifugal blowers move air by means of the centrifugal force generated by rotating a cylindrical runner on which blades have been arranged.\nCentrifugal blowers have a small outlet, which concentrates air in a single direction, and thus are used for local cooling. They also create large static pressure, making them optimal for cooling equipment through which air cannot flow easily and for airflow through ducts."
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An air compressor is a machine, usually made up of a piston connected to a crankshaft and moving in a valved cylinder (a mechanism similar to a piston engine), that takes in atmospheric air and compresses it to a higher pressure. The output, compressed air, may be stored in a pressure tank or may be used directly in air tools, dust-removal nozzles, paint sprayers, or to inflate tires (among many other uses). The compressor requires a source of mechanical power to operate. Probably the most-used type is a unit consisting of electric motor, compressor and tank with pressure gauge. See the ref. for a description of how they work.
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Hi. Not to discourage you but the shape and sealing of a Wankel rotary engine are a bear! Good idea though. Power to weight is good and an R/C does not have to meet emissions. It is possible : http://www.berkeley.edu/news/berkeleyan/2001/04/10_cmbus.html
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What do you mean by "unload"?  An air compressor works by taking air and basically compressing it into a tank.  The amount of pressure in the tank and coming out of the lines is controlled by two different valves, the tank pressure valve and the use valve.  Both valves have limits and most equipment states how much pressure they need.  I used a compressor to spray lacquers at work.  The thicker the lacker the higher the pressure I use to make sure the lacquer spreads niceley and doesn't bubble.
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The basis of most (more than 95%) refrigeration systems is the ' vapour compression cycle". The media (vapour) is Refrigerant (hydrochlorofluorocarbons - HCFC or hydrofluorocarbons - HFC) or freon which is non-toxic, non-explosive and non-corrosive. These Refrigerants have a boiling point of aprox. Minus 40°C which means that even if the air (outside or inside) temperature is as low as minus 39°C it still has heat to be absorbed by refrigerants. \n\nThe vapour compression cycle requires four components:\n\n1) The compressor: To raise the pressure of low-pressure low temperature gas to high-pressure high temperature gas. There are many types of compressors; the most common are Reciprocating, Rotary, Scroll, Screw and Centrifugal. \n2) The Condenser: To change the state of high-pressure, high temperature gas to high-pressure, high temperature LIQUID. This is achieved by passing ambient air (known as air-cooled) or water (known as water-cooled) over the condenser tubes. \n3) The Expansion Device: The purpose of the device is to change the state of the refrigerant from high-pressure, high temperature liquid to low pressure low temperature saturated liquid. This is achieved by passing the liquid through an orifice. \n4) The Evaporator: To absorb the heat from room air or water, which in the case of a chiller is circulated around the evaporator coil. This will change the state of low-pressure, low temperature saturated liquid to low pressure, low/medium temperature gas. \nThese components are common to the vast majority of domestic refrigerators and appear in slightly different forms in 95% of air conditioning and refrigeration systems, Domestic, commercial or industrial. This vapour compression cycle if reversed (condenser becomes evaporator and visa versa) can now absorb heat from outside and transfer it to inside, hence saving energy. This is called Reverse Cycle Heat Pump. Energy savings can be as high as 4 to 1 (for every kW input we get 4 kW output).
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compression and friction
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Elements of a Pneumatic installation are often available\nand easy to find, I know what you want to build, then list\nthe elements and buy it. If you just want to see how it works, you can buy a kit (search internet to find it).\nMost expensive member can be the compressor.