What Is the Difference Between Screw and Piston Compressors

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Reciprocating compressors (compressors) – arguably the most common type of compressors. Mostly used for domestic purposes, small repair shops, small and medium industries, car repair and other service industries, where the consumption of compressed air is typically less than 520 USgpm.

The main advantages of piston compressors, compared with other types of compressors, is their low price, simplicity of design, good maintainability, ability to operate in harsh environments and severe operating conditions. One important advantage of reciprocating compressors, is their good ability to work under repetitive short-term loads.

His name reciprocating compressors have received from his own design. The main parts are the compressor cylinder, piston, intake and exhaust valves. Reciprocating – the progressive movement of the piston is informed by a crank mechanism which drives the crankshaft. Lubrication is provided by “sprinkling”. A special scoop, needle or ring, impaled on the shaft or attached to the connecting rod capture oil, located in the crankcase, and sprayed it with the compressor. Thus, over the crankcase oil mist is formed, the particles which fall on the friction of the piston compressor. With this principle, lubrication, continuous monitoring of the level of oil in the crankcase. Oil is not filtered, so the constant need for periodic oil changes.

Screw compressors (compressors) differ from the piston its construction and, accordingly, the principle of action. They consist of a screw pair, placed in an oil bath, in contrast to reciprocating compressors provide easy travel, the relative absence of friction, and as a consequence of good heat. The oil film formed on a helical surface, creates an additional sealing effect, which leads to a reliable sealing system. Compared with reciprocating and screw compressors have the following advantages:

- Low noise;

- Low oil consumption;

- Low oil content of the generated air;

- Full automation of the process;

- The possibility of continuous operation (24 hours);

- A greater share of work (2-3);

- A large economy.

Thus, we conclude that under conditions of continuous consumption of large volumes of compressed air, screw compressors have a number of advantages, and their use is most advisable.


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