compressor

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compressor

A compressor is a mechanical device that increases the gas pressure by reducing its volume. An air compressor is a special type of gas compressor.

Compressors are similar to pumps:

Both increase the pressure on a fluid, and both can transfer fluid through a tube. Because the gases are compressible, the compressor also reduces the volume of the gas. Fluids are relatively inflexible. While some can be compressed, the main function of the pump is to pump and transfer fluids. Many compressors can be phased, meaning that the liquid is compressed several times in stages or phases to increase the discharge pressure. Often, the second stage is physically smaller than the first stage to accommodate the available compressed gas without reducing its pressure. Each stage compresses the gas further and increases the pressure as well as the temperature (if from the coolant). Do not use between steps).






















The main and important types of gas compressors are shown and discussed below:


Rotary screw compressors:


Use two positively rotating screw bolts to transfer gas to a smaller space. These are typically used for continuous operation in commercial and industrial applications and may be fixed or portable. Their application can be from 3 hp (2.2 kW) to more than 1200 hp (890 kW) and from low to medium pressure (> 1200 psi or 8.3 MPa). The classification of rotary screw compressors varies based on steps, cooling methods, and types of drives in other cases. Rotary screw compressors are commercially produced in Oil Flooded, Water Flooded and Dry type.










The efficiency of rotary compressors depends on the air dryer, [explanation needed] and the choice of air dryer is always 1.5 times the volume delivery of the compressor. There are designs with one screw or three screws instead of two. Screw compressors have fewer moving components, larger capacity, vibration, and overheating, can operate at variable speeds, and typically have higher efficiencies.


The small size or low speed of the rotor is not practical due to the inherent leakage due to the distance between the compression holes or screws and the compressor housing. They depend on good machining tolerance to prevent excessive leakage loss and in case of malfunction or improper service. , Are prone to injury.






Rotary vane compressors:














It consists of a rotor with a number of blades placed in radial slots in the rotor. The rotor moves in a larger chamber that is more circular or complex in shape. As the rotor rotates, the blades go into the slots and make contact with the outer wall of the chamber. Therefore, a series of low and high volumes is created by rotating blades. Rotary Vane Compressors are one of the oldest reciprocating compressors. With proper port connections, the devices may be a compressor or a vacuum pump. They can be fixed or portable, they can be single or multi-stage and powered by electric motors or motors Internal combustion is driven. Dry vane machines are used at relatively low pressures (eg 2 bar or 200 kPa or 29 psi) to move bulk material, while oil injection machines have the volumetric efficiency required to achieve pressures up to about 13 bar. (1300 kPa; 190 psi) In one stage, the rotary vane compressor is perfectly suitable for electric motor drive and is much quieter in performance than the equivalent reciprocating compressor. Rotary vane compressors can have a mechanical efficiency of about 90%.


















































3) Scroll compressors:


















A survey compressor, also known as a survey pump and vacuum scroll pump, uses two crushed spiral blades to pump or compress liquids such as liquids and gases. The geometry of the blades may be involuntary curves, spirals, or composite curves. They are easier to operate, quieter and more reliable than other types of compressors in a smaller volume range. Often, one of the scrolls is stationary, while the other spins away from the center without rotation, thus trapping or pumping liquid pockets between the scrolls.














Due to the minimum clearance between fixed scrolling and circuit navigation, these compressors have a very high volumetric efficiency. These compressors are widely used in air conditioning and refrigeration because they are lighter, smaller and have fewer moving parts than reciprocating compressors, and are also more reliable. Although they are more expensive, it is possible that in applications where cost is the most important or one of the most important factors that should be used when designing a refrigeration or air conditioning system, pellet coolers or rotary and reciprocating compressors.














In the early 1990s, these types of compressors were used as superchargers in Volkswagen G60 and G40 engines. Scroll compressors are more reliable than reciprocating and reciprocating compressors because they have fewer components and a simpler structure, because they have no volume and valve voltage, they are more efficient, they have less current and they vibrate. They do not have much. However, when compared to 


centrifugal compressors, scroll compressors have lower efficiencies and lower capacities.











































































































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