Compressed Air Engine Pdf

The Di Pietro Motor (Rotary Air Engine)The Di Pietro motor concept is based on a rotary piston., the Di Pietro motor uses a simple cylindrical rotary piston (shaft driver) which rolls, without any friction, inside the cylindrical stator. The space between stator and shaft driver is divided in 6 expansion chambers by pivoting dividers. These dividers follow the motion of the shaft driver as it rolls around the stator wall. The motor shown is effectively a 6 cylinder expansion motor.The cylindrical shaft driver, forced by the air pressure on its outer wall, moves eccentrically, thereby driving the motor shaft by means of two rolling elements mounted on bearings on the shaft. The rolling motion of the shaft driver inside the stator is cushioned by a thin film of air. Timing and duration of the air inlet and exhaust is governed by a slotted timer which is mounted on the output shaft and rotates at the same speed as the motor.Variation of performance parameters of the motor is easily achieved by varying the time during which the air is allowed to enter the chamber: A longer air inlet period allows more air to flow into the chamber and therefore results in A shorter inlet period will limit the air supply and allows the air in the chamber to perform expansion work at a much higher efficiency.

In this way compressed air (energy) consumption can be exchanged for higher torque and power output depending on the requirements of the application.Motor speed and torque are simply controlled by throttling the volume or pressure of air into the motor.

An Air Driven Engine makes use of Compressed Air Technology for its operation The Compressed Air Technology is quite simple. If we compress normal air into a cylinder the air would hold some energy within it. This energy can be utilized for useful purposes. When this compressed air expands, the energy is released to do work. So this energy in compressed air can also be utilized to displace a pistonSo this energy in compressed air can also be utilized to displace a piston. This is the basic working principle of the Air Driven Engine.

It uses the expansion of compressed air to drive the pistons of the engine. So an Air Driven Engine is basically a pneumatic actuator that creates useful work by expanding compressed air. This work provided by the air is utilized to supply power to the crankshaft of the engine.In the case of an Air Driven Engine, there is no combustion taking place within the engine. So it is non-polluting and less dangerous. It requires lighter metal only since it does not have to withstand elevated temperatures. As there is no combustion taking place, there is no need for mixing fuel and air.

Here compressed air is the fuel and it is directly fed into the piston cylinder arrangement. It simply expands inside the cylinder and does useful work on the piston. This work done on the piston provides sufficient power to the crankshaft.

Compressed Air Engine Plans

There is no combustion taking place in an Air Driven Engine. So naturally there is no need for the spark plug. So the spark plug is removed from its respective position that is on the top of cylinder head. It would be great if we provide the inlet for compressed air at the position of the spark plug as it is better to let the air enter from the top of the piston. So the connector which is used to connect the pipe from the compressed air tank has to be fixed at the position of the spark plug. The connector contains an R1/2 thread of BSPT standard. So we tapped the same thread on the cylinder head at the position of the spark plug.

Then the suitable connector was fixed on the cylinder head.For starting; the engine is cranked by the kicker. This will rotate the crankshaft along with the valve timing disk in the clockwise direction. During this rotation the ODC region of the disc cuts the IR beam first and followed by the EPO region.When the IR beam is first cut by ODC region, the circuit activates the solenoid valve by electric signal.

Compressed Air Engine Pdf Converter

At the moment the valve gets opened and allows the flow of compressed air into the cylinder from the tank through the piping system. The whole region from the point of ODC to EPO on the valve timing disk is opaque and does not allows the IR beam through it. So all the way long the circuit maintains the solenoid valve open by supplying a continuous supply of electric current to the valve. At the same time the compressed air from the tank continues to fill in the cylinder there by pushing the piston further towards the bottom dead centre(BDC). But to increase the fuel efficiency the fuel supply should be cut-off before reaching the EPO.So when the EPO region of the valve timing disc sweeps past away from between the IR sensors, the IR beam will make connection again. This will cut the supply to the solenoid valve there by closing the valve.

This will prevent the valve from being open at the same time of EPO; increasing efficiency.When the disc rotates further, the valve remains closed throughout the area from the EPO to the ODC as the IR beam is closed. And this cycle continue.