[Mechanical Equipment Technology Edition] Daily Question 201803013: Common Faults in Refrigeration Systems (9.14)
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Starting today, in order to enhance communication among those interested in marine equipment, we have launched the 【Question of the Day】 initiative on the Technical Forum for Moving Equipment. We encourage everyone to participate actively so that we can all 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 causes the motor to sweep in a semi-hermetic screw compressor? ============================== High-quality promotions: Mechanical equipment——York screw compressors: Maintenance procedures https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1806833 Mechanical equipment——Upgrading York Quinton control centers https://bbs.hcbbs.com/thread-1804837-1-1.html Mechanical equipment——GEA Grasox screw compressors: Major repairs https://bbs.hcbbs.com/thread-1800467-1-1.html Mechanical equipment——British HOWDEN screw compressors: Disassembly and maintenance https://bbs.hcbbs.com/thread-1832529-1-1.html Mechanical equipment——Japanese MYCOM screw compressors: Disassembly and maintenance https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=
Uneven air gaps can cause excessive magnetic pulling force on one side of the motor, resulting in hunting. Wear in the compressor’s compression chamber and high-pressure end face can also lead to shaft binding or sweeping.
Motor rubbing occurs when the rotor of a three-phase asynchronous motor comes into friction with the silicon steel sheets in the stator windings; this is usually caused by damaged bearings.
Low oil level, dirty refrigeration system, clogged oil filter, worn bearings
Motor scoring is usually caused by bearing wear, the rotor sinking, or excessive deflection of the shaft that leads to rotor eccentricity, resulting in friction between the rotor and the silicon steel sheets in the stator windings.
Wear in the compressor’s compression chamber and high-pressure end face can also lead to shaft binding or sweeping.