【Mechanical Equipment Technology Edition】Daily Question 20171226: Common Faults in Refrigeration Systems (4.1)
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This post was last edited by YORK Industrial Refrigeration on 2018-1-2 at 08:14. Starting from now, in order to enhance communication among members, a \"Question of the Day\" 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 score will be assigned if more than two days pass. What kind of failures are most likely to occur in the energy regulation devices of refrigeration compressors? Answer: It’s not possible to load it, nor can it be unloaded; automatic loading/unloading is also not feasible. https://attach01.hcbbs.com/forum/201712/27/083237nbgb4v9n7dbhbd9b.gif GIF.gif (3.19 MB, downloads: 0) Download the attachment and save it to your album. Uploaded yesterday at 08:32. =============================== High-quality promotions: Moving equipment – Summary of work done by equipment managers in 2017. https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1881872 Moving equipment – Maintenance procedures for York screw compressors. https://bbs.hcbbs.com/thread-1806833-1-1.html Moving equipment – Upgrading of York Quontum control centers. https://bbs.hcbbs.com/thread-1804837-1-1.html Moving equipment – Major repairs for GEA Grauso screw compressors. https://bbs.hcbbs.com/thread-1800467-1-1.html Moving equipment – Disassembly and maintenance of British HOWDEN screw compressors. https://bbs.hcbbs.com/thread-1832529-1-1.html Moving equipment – Disassembly and maintenance of Japanese Maekawa MYCOM screw compressors. https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=
It is not flexible in operation, has large deviations, and its performance is unstable
In refrigeration compressors, what kind of failures are most common in the energy regulation device: inability to load and unload properly
It is not flexible in operation, has large deviations, and its performance is unstable
Faults such as failed energy percentage adjustment, excessively high lubricating oil temperature, and large oil pressure difference
Energy percentage adjustment failure, high lubricating oil temperature, large oil pressure difference
The most common fault in energy regulation is ； Surface wear of the capacity control spool occurs, until it gets stuck in the spool hole and can no longer move back and forth; the causes of this fault are: 1. The gap between the capacity control spool and the spool hole is either too small or too large ； 2. The surface roughness coefficients of the capacity control valve and the spool hole are too high ； 3. The material of the capacity control valve is inappropriate. Improvement measures: 1. Select an appropriate fit clearance ； 2. Reduce the machining coefficient for surface roughness of parts ； 3. Increase the material hardness of the spool valve ； 4. Different materials are used for the casing and spool valve.
1. The energy regulation mechanism operates inflexibly, resulting in unstable operating conditions. 2. Errors in the energy percentage and internal pressure ratio result in insufficient cooling capacity. 3. Lubricant temperature is too high. 4. Oil pressure difference is too large
It is not flexible in operation, has large deviations, and its performance is unstable