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Questions and Answers
What is the role of the male rotor in the compression mechanism?
What is the role of the male rotor in the compression mechanism?
Which component directly aids in the lubrication process between the rotors?
Which component directly aids in the lubrication process between the rotors?
During the compression process, what happens to the capacity of the groove?
During the compression process, what happens to the capacity of the groove?
What do the four-piece convex teeth of the male rotor primarily do?
What do the four-piece convex teeth of the male rotor primarily do?
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How does the injected oil transform during the compression process?
How does the injected oil transform during the compression process?
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What is the primary function of a compressor?
What is the primary function of a compressor?
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Which type of compressor is characterized by its ability to handle high flow rates?
Which type of compressor is characterized by its ability to handle high flow rates?
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What distinguishes centrifugal compressors from axial compressors?
What distinguishes centrifugal compressors from axial compressors?
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In which scenario would a screw compressor be the most suitable choice?
In which scenario would a screw compressor be the most suitable choice?
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What is a notable feature of centrifugal compressors?
What is a notable feature of centrifugal compressors?
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Study Notes
Mechanical Seal
- Lubricated by oil between rotors
- Contains a male rotor, female rotor, radial bearing, radial thrust bearing, built in gear, lubricant oil pump, casing, gas inlet, and gas outlet
- The Male rotor has four piece teeth of convex type
- The Female rotor has six piece teeth of concave type
Compression Mechanism (Wet process)
- Inlet process: The female rotor rotates by the rotating male rotor, gas is aspirated from the inlet groove
- Compressed process: The inlet port is sealed, the groove capacity decreases, gas is compressed by rotating the rotor, cooled oil is injected
- Compression completion: The injected oil becomes mist, and compression is highly effective
- Discharge process: When the rotor reaches the exhaust slot the compressed gas mixed with oil is exhausted, pulses don’t occur when suction and discharge because the rotation of the rotor is fast
Compression Basics
- Gases are compressible fluids
- A machine that compresses gas resulting in higher density and higher pressure
- Compression can be achieved by rotating an impeller or reciprocating a piston
Compression Principle
- Gas is compressed when volume decreases
- This cycle is repeated
- Discharge pressure and volume are higher than suction pressure and volume
Classification of General Compressor
- Centrifugal
- Axial
- Screw
- Reciprocating
Feature of Compressor and Main Usage
- Centrifugal Compressor: High pressure and large capacity
- Main Usage: Low pressure air, separation unit, ammonia, methanol synthesis, jet engine, gas turbine, mass air, pressure source
- Axial Compressor: Strong against dust and mist, suitable for large flow rate
- Main Usage: Jet engine, gas turbine, mass air, pressure source
- Screw Compressor: Wet process is highly effective, an discharge temperature, no pulse, oil mixing of dry relation, suitable for disposal gas
- Main Usage: Freezer, general pneumatic, semiconductor relation, food relation, general pneumatic, hydrogen, oxygen
- Reciprocation Compressor: Suitable for high-pressure small volume, low temperature gas, cause constructional and pulse relation
- Main Usage: General pneumatic, hydrogen, oxygen, low-temperature gas
Compression Ratio
- The ratio between the discharge pressure and suction pressure
Compressor Discharge Temperature
- The discharge temperature is related to the compression ratio
Reciprocating Compressors
- They have a reciprocating motion
Motion of Reciprocating Compressor
- The piston moves back and forth in a cylinder
Reciprocating Type Compressor
- It has four strings and a cylinder part
Compressor Load Valve
- Contains locknuts, O-ring, guide pins, spring plates, lift washers, guide ring, center bolt
Compressor Unloader
- Keeps suction valve open
- Gas returns back to the suction side
- No increase in pressure (no load)
Screw Compressor
- Usually used for high capacity and high compression ratio
- The refrigerator compressors utilize screw compressors
- They can be oil lubricated or refueling type
- Contain a speeding up gear, bearing, mechanism seal, casing, male rotor, female rotor, and input shaft
- The power from the electric motor is transmitted to the male rotor through the speeding up gear, and from the female rotor by engagement
Wet Process - Oil Screw-threaded
- Consists of speeding up gear, bearing, mechanism seal, casing, male rotor, female rotor, and input shaft
- The power is supplied by the electric motor
- The power is transmitted to the male rotor through the speeding up gear, and tooth form
- The female rotor rotates by engagement
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Description
This quiz focuses on mechanical seals and the fundamentals of gas compression mechanisms, specifically the wet process. It covers the components and processes involved in the operation of rotors and the role of lubricants in effective gas compression. Test your knowledge on these essential engineering concepts.
