Pneumatic System: Air Generation

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Questions and Answers

What is the primary function of a compressor in a pneumatic system?

  • To regulate the temperature of the air.
  • To convert electrical energy into pneumatic energy.
  • To compress air and deliver it at a higher pressure. (correct)
  • To filter impurities from the air.

A pressure switch directly powers the pneumatic actuator.

False (B)

What is the role of a check valve in the air generation system?

prevent air leaking back

The primary role of a tank in an air generation system is to ______ compressed air.

<p>store</p> Signup and view all the answers

Match the following components with their function in an air generation system:

<p>Refrigerated Air Dryer = Cools compressed air to condense humidity Line Filter = Removes dust, water, and oil from the air Safety Valve = Releases air if pressure exceeds allowed limits Pressure Gauge = Indicates tank pressure</p> Signup and view all the answers

Why is air typically taken off from the top of the main pipe in an air distribution system?

<p>To allow any condensate to remain in the main pipe. (A)</p> Signup and view all the answers

Manual Drains are generally more efficient than Auto Drains in preventing water accumulation in pipelines.

<p>False (B)</p> Signup and view all the answers

What are the three main functions of an air service unit?

<p>conditions air, cleans air, regulate pressure</p> Signup and view all the answers

A ______ transforms the potential energy of compressed air into mechanical work.

<p>actuator</p> Signup and view all the answers

What is the purpose of speed controllers in relation to actuators?

<p>To allow easy and step-less speed adjustment of the actuator movement. (A)</p> Signup and view all the answers

Flashcards

Compressor

Compresses air from atmospheric pressure to a higher pressure, converting mechanical energy into pneumatic energy.

Electric Motor (for Compressor)

Supplies mechanical power to the compressor, converting electrical energy into mechanical energy.

Pressure Switch

Controls the electric motor by monitoring tank pressure, stopping it at maximum pressure and restarting at minimum pressure.

Check Valve

Allows compressed air into the tank but prevents backflow when the compressor is off.

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Tank (Air Reservoir)

Stores compressed air to stabilize pressure and reduce compressor cycling.

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Pressure Gauge

Indicates the pressure level inside the tank.

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Auto Drain

Automatically removes condensed water from the tank without manual intervention.

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Safety Valve

Releases compressed air if the tank pressure exceeds the safe limit.

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Refrigerated Air Dryer

Cools compressed air to condense and remove moisture.

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Line Filter

Removes dust, water, and oil mist from the compressed air in the main pipe.

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Study Notes

  • An air compressor takes in air at atmospheric pressure, compresses it, and delivers it at a higher pressure to the pneumatic system, converting mechanical energy into pneumatic energy.
  • Electric motors supply mechanical power to the compressor, converting electrical energy into mechanical energy.

Air Generation System

  • A pressure switch controls the electric motor by sensing the pressure in the tank, stopping the motor at a maximum pressure and restarting it at a minimum pressure.
  • A check valve lets compressed air from the compressor into the tank and prevents it from leaking back when the compressor is stopped.
  • A tank stores compressed air and stabilizes it by compensating for pressure fluctuations.
  • When the pressure in the reservoir drops below a certain value, the compressor compensates until the set higher value is reached, so the compressor does not need to operate continuously
  • A pressure gauge indicates the tank pressure.
  • An auto drain automatically removes water condensing in the tank.
  • A safety valve releases compressed air if the tank pressure exceeds the allowed limit.
  • A refrigerated air dryer cools the compressed air to a few degrees above freezing, condensing most of the air humidity, which avoids water in the downstream system.
  • A line filter in the main pipe has minimal pressure drop and can remove oil mist, keeping the line free from dust, water, and oil.

Air Distribution & Consumption System

  • Air is taken off from the top of the main pipe to allow occasional condensate to stay in the main pipe.
  • When the condensate reaches a low point, a water take off from beneath the pipe will flow into an Automatic Drain and the condensate will be removed
  • Every descending tube should have a drain at its lowest point, and the most efficient method is an Auto Drain, which prevents water from remaining in the pipeline.
  • An air service unit conditions compressed air to provide clean air at optimum pressure and may add lubricant to extend the life of pneumatic system components that need it.
  • A directional valve alternately pressurizes and exhausts the cylinder connections to control the direction of movement.
  • An actuator transforms the potential energy of the compressed air into mechanical work; this can be a linear cylinder or a rotary actuator.
  • Speed controllers allow easy and stepless speed adjustment of the actuator movement.

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