[Mechanical Equipment Technology Edition] Daily Question 201808024: Refrigeration Systems—Case Analysis (2.3)
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This post was last edited by YORK Industrial Refrigeration on 2018-8-27 at 08:10. This year’s 【Daily Question】is divided into three categories: screw refrigeration compressors, refrigeration systems, and oil circuit systems, aiming to provide a comprehensive understanding of refrigeration technology. (If you encounter something you don’t know or can’t answer, please actively look up information; as you do so, your skills will improve!) ) All those who comment on this post will receive 1-3 wealth points; those who give complete answers will receive 10-15 points, with the validity period being two days. Based on Figures 1, 2, and 3 below, which areas inside the compressor require oil supply? Answer: 1. The front and rear bearings of the compressor; 2. The energy regulation device; 3. The position of the screw (Figure 1): https://attach01.hcbbs.com/forum/201808/22/134523gv33gogp77xlrakh.jpg.thumb.jpg (Figure 2): https://attach01.hcbbs.com/forum/201808/22/134552dg4rybkggo1rr8o2.png.thumb.jpg (Figure 3) ============================== High-quality promotions: Machinery – Videos on the repair and adjustment of York compressors: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1806833 Machinery – Procedures for maintaining York screw compressors: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1806833 Machinery – Upgrading of York Quinton control centers: https://bbs.hcbbs.com/thread-1804837-1-1.html Machinery – Major repairs of GEA Grasox screw compressors: https://bbs.hcbbs.com/thread-1800467-1-1.html Machinery – Disassembly and maintenance of British HOWDEN screw compressors: https://bbs.hcbbs.com/thread-1832529-1-1.html Machinery – Disassembly and maintenance of Japanese MYCOM screw compressors: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=
It’s too complicated; it’s not something idiots like us can understand
Oil-free screw compressors have oil injection at the speed increase gearbox and bearings, while oil-injected screw compressors have oil injection inside the compressor casing and at the bearings.
The front and rear bearing areas, the spool valve area,
First, the bearings at both ends of the compressor need to be lubricated； If it has a gearbox, lubrication is also required here ； The actuating part of the load control slide valve and the electromagnetic directional control valve require oil ； If the screw compressor is of the oil-injection type, oil injection is also required at the inlet.
The front and rear bearings, as well as the sliding elements, consist of two parts: one for loading and unloading, and the other for screw sealing and shaft sealing.
Sliding valve, rotor, bearing, transmission mechanism
I’m sorry, teacher! The project has been quite busy, and I haven’t had the time to look up information carefully. I remembered that oil was injected into the compressor at its inlet due to pressure differences; that’s why I wrote “inlet”. After checking some information today, I learned that screw-type refrigeration compressors generally use pressure lubrication by injection, meaning that during operation, the lubricating oil is pumped into the areas where the screws move, as well as other parts that require lubrication. There are four purposes for this: first, to remove the heat generated during compression, thereby making the compression process more akin to an isothermal compression and reducing the exhaust temperature, which in turn prevents the components from deforming due to heat ； Secondly, injecting lubricating oil into the cylinder enables sealing between the rotors as well as between the rotors and the cylinder, thereby reducing internal leaks ； Third, it lubricates the moving parts of screw refrigeration compressors, extending the lifespan of these components so as to ensure long-term, economical, and safe operation ； Fourth, oil injection simplifies the structure of screw refrigeration compressors and helps to reduce operating noise. Thank you, teacher, for your guidance!