[Q&A Question 064] 2018.03.05
Thread Content
This post was last edited by Internet Invisible Man on 2018-3-5 08:46. [Q&A Question No. 064] 2018.03.05: How to understand one reciprocating movement of the piston in a piston compressor? Answer: In a piston compressor, one complete cycle refers to the sum of all processes that occur in the cylinder as the piston completes one back-and-forth movement. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Due to the limitations on the number of posts in the “One Question per Day” section, “One Image per Day” has been moved to the registered devices section; you can access it through the directory I posted. For management purposes, if you need to access content from a few days ago, please go to the summary post below to enter the “My Registration Season” event – (Note: This event is currently underway in the Chemical Engineering section) https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=18978. Summary post of daily questions for the 2018 Chemical Engineering Technology Training section: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888971. Summary post of daily images for the 2018 Registered Equipment section: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888970. Summary post of Q&A questions for the 2018 Hydrogen Production and Hydrogenation Technology section: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888968. Summary post of daily questions for the 2018 LNG Technology Discussion section: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888973. Summary post of Q&A questions for 2017 (updates have started): https://bbs.hcbbs.com/thread-1657793-1-1.html. Summary post of daily questions for 2017 (updates have started): https://bbs.hcbbs.com/thread-1657794-1-1.html. Summary post of daily images for 2017: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1875160. List of daily questions for the 2017 LNG section: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1804162. Summary post of Q&A questions for 2016 (updates completed): https://bbs.hcbbs.com/thread-1597792-1-1.html
The processes of intake, compression, and exhaust occur sequentially within the cylinder, thus completing one working cycle
As the crankshaft of a piston compressor rotates one full cycle, the piston moves back and forth once, allowing processes of intake, compression, and exhaust to take place sequentially within the cylinder – thus completing one working cycle.
As the piston moves back and forth once, it goes through the four processes of expansion, intake, compression, and exhaust, which together constitute one working cycle.
The process of compressing gas in a piston compressor is primarily accomplished through the continuous back-and-forth movement of the piston within the cylinder. One complete back-and-forth cycle of the piston within the cylinder is divided into three stages: intake, compression, and exhaust, which together constitute one working cycle.
In a piston compressor, one reciprocating movement of the piston corresponds to the sequential completion of four processes within the cylinder: intake, compression, exhaust, and expansion – that is, one working cycle is completed.
The four strokes of expansion, intake, compression, and exhaust are completed
A reciprocating compressor belongs to the category of positive-displacement compressors; it is a compressor that sequentially draws in and discharges a certain volume of gas from a closed space in order to increase the static pressure. The crankshaft drives the connecting rod, which in turn drives the piston, causing the piston to move up and down. The movement of the piston causes changes in the volume inside the cylinder. When the piston moves downward, the volume of the cylinder increases; the intake valve opens while the exhaust valve closes, allowing air to be drawn in, thus completing the intake process ； As the piston moves upward, the cylinder volume decreases, the exhaust valve opens, and the intake valve closes, completing the compression process.
In a piston compressor, one complete cycle refers to the sum of all processes that take place in the cylinder as the piston completes one back-and-forth movement.