Pneumatic and Electrical Circuits: Components and Functions

Pneumatic and Electrical Circuit Fundamentals

Pneumatic Circuits

A pneumatic circuit is a system composed of interconnected elements through which compressed air circulates. It consists of several key components:

• Compressor group: Supplies the necessary air pressure.
• Ducts: Channels for air flow to work elements.
• Pneumatic actuators: Responsible for performing mechanical work.
• Distribution elements: Enable or hinder air passage.
• Auxiliary elements: Fulfill functions such as protection and regulation.

Electrical Circuits

An electrical circuit is formed by a series of basic elements:

• Generator: Provides the potential difference.
• Conductors: Allow the passage of electric current.
• Receptors: Transform electrical energy into other usable forms.
• Control elements: Manage the supply to the circuit or receiver.
• Protection elements: Safeguard against overloads.

Compressor Systems

A compressor system consists of several essential parts:

• Compressor: Increases the pressure of the aspirated atmospheric air.
• Auxiliary motor: Provides movement to the compressor's rotation axis.
• Refrigerator: Lowers the temperature of the compressed air.
• Storage tank: Stores compressed air for use when needed.
• Maintenance unit: Ensures air quality through:
  • Filtering: Centrifugal air cleaning.
  • Regulation: Ensures stable pressure, monitored via a manometer.
  • Lubrication: Adds oil to the compressed air via nebulization.

Pneumatic Applications

Common applications include: transfer, pressing, stopping, ejecting, assembly, marking, shaping, and pivoting.

Distribution Valves

A pneumatic valve directs and regulates air flow. When representing valves symbolically according to ISO standards, consider:

• Valve type: Expressed in figures denoting the number of ports and working positions.
• Air circulation direction: Indicated by arrows.
• Connections: Ports are marked based on whether they are a compressed air source or a free exhaust.
• Command and actuation methods: Represented from left to right.

Auxiliary Valves

• Check valves: Allow air circulation in one direction and prevent it in the opposite, using a spring-loaded closure.
• Double-effect or selector valves: Feature three ports and a piston that moves to block one entrance or the other.
• Flow control valves: Utilize a spiral to adjust the cross-section, regulating the volume of air flow.