Piston Compressors
Working Principles of Piston Compressors
The piston compressor is one of the earliest compressor designs, but it is still one of the most versatile and very efficient. In a piston compressor, a piston is moved forward in a cylinder by means of a connecting rod and a crankshaft. If only one side of the piston is used for compression, it is called a single-acting compressor. If both the upper and lower sides of the piston are used, it is called a double-acting type.
The piston compressor is very versatile and has almost no limitations. It can compress air as well as gas with little or no modification. The piston compressor is the only design capable of compressing air and gas to high pressures suitable for applications such as breathing air.
Configurations of piston compressors can range from single-cylinder configurations for low-pressure/small-volume applications to multi-stage configurations capable of compressing to very high pressures. In a multi-stage compressor, air is compressed in stages, increasing the pressure in each stage.
Typical applications are:
Gas compression (CNG, nitrogen, inert gases, landfill gases)
High-pressure air (breathing air for underwater respirator cylinders, seismic surveys, pneumatic circuits, etc.)
PET bottle blowing, engine start-ups, industrial
Rotary Screw
Rotary screw compressors. Principle of operation
Screw compressors are volumetric compressors with a piston in the form of a screw; this is the main type of compressor in use today. The main components of the screw compressor element are a convex rotor and a concave rotor, which move close to each other so that the volume between them and inside the chamber is gradually reduced. The pressure ratio of the screw type depends on the length and shape of the screw and the shape of the discharge port.
The screw element is not equipped with any valves, and there are no mechanical forces that create imbalances. Therefore, it is possible to operate at high shaft speeds and to combine high flow rates with small external dimensions
Typical applications are:
Food, beverage, brewing
Military, aerospace, automotive
Industrial, electronics, manufacturing, petrochemical
Medical, hospitals, pharmaceuticals
Metered air
Rotary slide
Rotary slide
Rotary slide
Rotary slide
Rotary slide
Rotary slide
Rotary Sliding Vane Compressor Principle of Operation
Sliding vane compressors utilize traditional, proven technology with direct drive at very low speeds (1,450 rpm) for unparalleled reliability. The rotor, which is the only continuously running component, has a number of slots cut along its length in which slide blades are inserted that slide on a film of oil.
The rotor rotates in the stator of the cylinder. During rotation, centrifugal forces push the slides out of the slots, creating individual compression chambers. The rotation decreases the volume of the compression chamber and increases the air pressure.
The heat generated by compression is controlled by injecting pressurized oil.
The high-pressure air is discharged through an exhaust port, where the oil residue is removed by a final oil separator.
Typical applications are:
OEM, Printing, Pneumatic
Laboratory, Dental, Instrumentation
Machine Tools, Packaging, Robotics