[Mechanical Equipment Technology Edition] Daily Question 201701031: Energy regulation mechanism of screw compressors (Completed)
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This post was last edited by YORK Industrial Refrigeration on 2017-11-2 at 08:56. Starting from now, in order to enhance communication among users, a 【Daily Question】 campaign has been launched on the Mechanical Equipment Technology forum; we hope everyone will participate actively to progress and improve together! ! ! Rewards: 3 wealth points for active participation, 10-15 wealth points for correct answers. This question is valid for two days; no scoring will be given after that period. Previously, it was discussed that the energy regulation of open-type compressors involves slide valve control and specific volume ratio control. The next two diagrams show the stepless regulation (slide valve control) of semi-hermetically sealed compressors, as well as piston-type regulation. The piston-regulated screw compressor model is relatively small and is designed to compete with smaller piston compressors! Half-seal compressors are divided into continuously variable regulation (as shown in the figure below) and stepwise regulation, with the load capacities for stepwise regulation being 25%, 50%, 75%, and 100% respectively. Studies show that the compressor operates at its best when the slide valve position is above 50%. That’s all for what concerns energy regulation. Essentially, it involves controlling the effective working area of the screw in order to adjust the energy load and match it to the cooling demand, thereby reducing the impact on the power grid during startup when there is no load You are free to respond this time; feel free to leave a message if you have any questions, or share your opinions if not! ================================ High-quality promotions: Mechanical equipment---Maintenance procedures for York screw compressors http://bbs.hcbbs.com/thread-1806833-1-1.html Mechanical equipment---Upgrading of York Quinton control centers http://bbs.hcbbs.com/thread-1804837-1-1.html Mechanical equipment---Major repairs for GEA Grasso screw compressors http://bbs.hcbbs.com/thread-1800467-1-1.html Mechanical equipment---Disassembly and maintenance of British HOWDEN screw compressors http://bbs.hcbbs.com/thread-1832529-1-1.html Mechanical equipment---Disassembly and maintenance of Japanese Maekawa MYCOM screw compressors http://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1786445
The information is great. Thank you. How are 25/100, 50/100, 75/100, 100/100 adjusted? It would be great if there could be a diagram.
The information is great. Thank you. How are 25/100, 50/100, 75/100, 100/100 adjusted? It would be great if there could be a diagram.
A half-screw compressor has four solenoid valves; one of them is used for main oil supply, while the remaining three each correspond to a loading position. When the solenoid valve for a particular loading position is activated, the cavity of the oil piston becomes connected to the suction side. During the upload process, 25% load: the main fuel supply solenoid valve is activated, the 25% load solenoid valve is also activated, while those at 50% and 75% load are in the off state. 50% load: The main fuel supply solenoid valve is always in the on state; the 25% load solenoid valve is off, the 50% load solenoid valve is on, and the 75% load solenoid valve is off. 75% load: The main supply solenoid valve is always in the on state; the 75 solenoid valve is open, the 50 solenoid valve is closed, and the 25 solenoid valve is also closed. 100% load: The 25, 50, and 75 solenoid valves are all in the closed state, while the main supply solenoid valve is in the on state.
Let’s take a look at and understand the working principle of compressors with a learning attitude. Thank you, OP.