Power Point Presentation Chapter 11 Pneumatic System Components
- Slides: 28
Power. Point® Presentation Chapter 11 Pneumatic System Components Pneumatic Systems • Control Devices • Work Devices
Chapter 11 — Pneumatic System Components Pneumatic systems contain components that compress and store the air that is used to increase system pressure to accomplish work.
Chapter 11 — Pneumatic System Components A single large compressor or multiple small compressors can be installed depending on the needs of a facility.
Chapter 11 — Pneumatic System Components Air compressors are either nonpositive displacement or positive displacement.
Chapter 11 — Pneumatic System Components A reciprocating-piston air compressor compresses air by extending and retracting a piston inside a cylinder.
Chapter 11 — Pneumatic System Components Air compressor cylinders often have cooling fins to dissipate some of the heat created by friction and air compression.
Chapter 11 — Pneumatic System Components A multistage air compressor can be used to efficiently compress air to high levels.
Chapter 11 — Pneumatic System Components In small commercial units, the prime mover is usually connected to the air compressor with V-belts pulleys.
Chapter 11 — Pneumatic System Components A rotary-vane air compressor uses sliding vanes to decrease volume as the rotor rotates.
Chapter 11 — Pneumatic System Components A rotary-screw air compressor traps air between the screw shafts and compresses air as the volume between the screw shafts is reduced.
Chapter 11 — Pneumatic System Components Oil-flooded compressing mechanisms lubricate the rotors and rotor end bearings by injecting a synthetic oil bath into their internal passages.
Chapter 11 — Pneumatic System Components Many receivers are cylindrical steel tanks that are used to store compressed air until it is needed to accomplish work.
Chapter 11 — Pneumatic System Components A pressure switch electrically controls the energizing or de-energizing of a prime mover when a set pressure has been reached.
Chapter 11 — Pneumatic System Components Once system pressure is high enough to overcome the biasing spring, a poppet in the safety valve opens and air from the receiver is exhausted into the atmosphere.
Chapter 11 — Pneumatic System Components The different types of relief valves used in pneumatic systems are poppet, ball, and diaphragm.
Chapter 11 — Pneumatic System Components Two-position, three-way directional control valves and three-position, fourway directional control valves are commonly used in pneumatic systems.
Chapter 11 — Pneumatic System Components A muffler is attached to an exhaust port of a directional control valve to deaden the noise of air as it exhausts.
Chapter 11 — Pneumatic System Components A needle valve is the most common type of pneumatic metering valve and is available with or without a check valve.
Chapter 11 — Pneumatic System Components Although there are many similarities between pneumatic and hydraulic cylinders, there also several differences.
Chapter 11 — Pneumatic System Components A cylinder cushion sometimes includes a needle valve with a check valve in the end cap at the rod end, cap end, or both.
Chapter 11 — Pneumatic System Components A single-acting, springreturn cylinder returns the rod to its retracted position when airflow is exhausted.
Chapter 11 — Pneumatic System Components A double-acting cylinder uses compressed air to move a piston in both directions.
Chapter 11 — Pneumatic System Components Double-rod cylinders are used when there is a load on each end of the rod.
Chapter 11 — Pneumatic System Components A rodless cylinder has a cartridge attached to the piston.
Chapter 11 — Pneumatic System Components A diaphragm cylinder uses a plastic, metal, or rubber diaphragm to extend or retract the rod.
Chapter 11 — Pneumatic System Components The most common type of rotary cylinder has a rack-and-pinion mechanism.
Chapter 11 — Pneumatic System Components Air motors can be vane, radial piston, or axial piston.
Chapter 11 — Pneumatic System Components The two most common types of vacuum cups are flat and bellow vacuum cups.