Compressors complete description and a well arranged slides for the topic. That's too the point and relevant slide share you are looking for! Hope you will find it easy to understand
Thank you!
Compressors complete description and a well arranged slides for the topic. That's too the point and relevant slide share you are looking for! Hope you will find it easy to understand
Thank you!
Bicomponent fibers are filaments made up of two different polymers that are extruded from the same spinneret with both polymers contained within the same filament but separated by a fine plane. The two polymers differ in chemical nature or physical properties such as molecular weight
Bicomponent fibers are filaments made up of two different polymers that are extruded from the same spinneret with both polymers contained within the same filament but separated by a fine plane. The two polymers differ in chemical nature or physical properties such as molecular weight
A compressor is a type of machine that increases the pressure of a gas by reducing its volume. An air compressor is a specific type of gas compressor. Compressors helps to transport the fluid through a pipe maintaining the high pressure conditions. It is convers power (using and electrical motor, diesel or gasoline engine, etc.) into potential energy stored in pressurized air. The main and important types of gas compressors are illustrated and discussed below.
Delivery volume is the quantity of air that a compressor delivers to a system.
It is specified in terms of air at normal atmospheric conditions.
There are two types of delivery volumes
Ex:
For a reciprocating compressor, the theoretical delivery volume is the product of volume of air swept in one revolution of its rotating element and the number of revolutions per unit time.
Effective delivery volume
Depends on the type of compressor.
To pneumatic personnel, only the effective delivery volume is of interest as this air volume is available for driving and controlling pneumatic equipment.
When air is compressed, work is done, and a part of this work
appears as heat in the compressed air.
The heat produced must be removed by cooling the air. Good cooling extends the life of the compressor.
Cooling methods
Selection of a suitable cooling system depends on the amount of heat produced.
Cooling fins on smaller air-cooled compressors permit the heat to be
removed by radiation.
A large compressor is usually equipped with an additional fan to take away the heat. In the case of a compressors with a drive power in excess of 30 kw are equipped with a water circulation cooling system.
To match the delivery volume of the compressor with the fluctuating air consumption and as a safety measure, it is necessary to regulate the pressure developed by the compressor.
Various methods of regulation are employed for this purpose.
Start/Stop (On-off Regulation)
Pressure (switching) limits Pmax and Pmin that can be set on a regulator. The drive motor is switched off on reaching a preset maximum pressure, Pmax The motor is switched on again when the pressure has dropped to a preset minimum pressure, Pmin.
Start/Stop (On-off Regulation)
It keeps the motor running continuously, but unloads compressor when the discharge pressure is adequate.
Unloaded rotary screw compressors typically consume 15-35% of their full load power demand, while producing no useful compressed air output.
Optional unload timers are available that will save energy by automatically turning off the compressor and placing it in standby if the unit runs unloaded for a period of time (usually 15 minutes).
Regulation methods
Modulating Control
This mode of control varies the compressor output to meet flow requirements by adjusting the inlet valve, resulting in air restrictions to the compressor.
Variable Displacement
Some lubricated rotary screw compressors vary their output capacity using special capacity control valves, also called spiral, turn or poppet valves.
With a variable displacement control scheme, the output pressure and compressor power consumption can be closely controlled without having to start/stop or load/unload the compressor.
Regulation methods
Variable Speed Drive (VSD)
This control method varies the speed of the compressor to respond to changes in air demand.
Both lubricated and oil free screw compressors can be purchased equipped with variable speed drive controls that c
DETAIL STUDY ON TYPES OF AIR COMPRESSOR (POSITIVE & DYNAMIC ) WITH ITS WORKING PRINCIPLE AND MAINTENANCE PROCEDURE. ADVANTAGE OF DYNAMIC COMPRESSURE, ADVANTAGE OF POSITIVE DISPLACEMENT COMPRESSOR,DRAWBACK OF SINGLE STAGE AIR COMPRESSOR OVER MULTISTAGE COMPRESSOR
8. Axial-flow compressors:
Axial flow dynamic compressors
are dynamic rotating compressors that use
arrays of fan-like airfoils to progressively
compress the working fluid. They are used
where there is a requirement for a high
flow rate or a compact design.
13. Diaphragm compressors
A diaphragm compressor (also
known as a membrane compressor) is a
conventional reciprocating compressor. The
compression of gas occurs by the movement
of a flexible membrane instead of an intake
element.
14.
15. Rotary screw compressors
Rotary screw compressors
use two meshed rotating positivedisplacement helical screws to
force the gas into a smaller space
16.
17. Rotary vane compressors
A rotary vane pump is a positivedisplacement pump that consists of vanes
mounted to a rotor that rotates inside of a
cavity.
18.
19. Scroll compressors:
A scroll compressor, also known as
scroll pump uses two interleaved spiral-like
vanes to pump or compress fluids such
as liquids and gases They operate more
smoothly, quietly, and reliably than other
types of compressors .
