Reasons and rescue methods for cold storage compressor cylinder jamming | Liquid impact cylinder jamming, impurity cylinder jamming, long-term static locking
Cylinder jamming refers to the situation where the crankshaft and piston pair of the compressor get stuck, unable to rotate when powered on, producing only a buzzing sound when powered on, and the thermal protection quickly trips. There are three types of cylinder jamming: liquid tapping, impurity jamming, and static locking.
Liquid impact stuck cylinder: Liquid refrigerant enters the cylinder, compresses incompressible liquid, and instantly impacts the piston, which is a destructive fault that often occurs when the machine returns liquid or the expansion valve loses control.
Impurity stuck cylinder: Metal powder, welding slag, and oxidation pickup in the system are mostly caused by incomplete blowing of the new system and oil filter failure in the gap between the piston and cylinder.
Long term static locking: When the unit is sealed for a long time, the refrigeration oil flows away from the friction surface, the oil film disappears, the metal surface is slightly corroded, the crankshaft is locked, and idle units are more common during the off-season.
Priority is given to distinguishing stuck cylinders in Xiteluo piston engines: slight locking can be attempted with a slight impact; Severe liquid impact is likely to cause deformation of the cylinder body and valve plates, so they should be disassembled and repaired directly.
Jogging rescue operation: Repeatedly jog for short periods of time, 1-2 seconds each time, with an interval of 30 seconds; Long term continuous power on is prohibited to avoid burning out the motor winding.
After many masters get stuck in the cylinder, they continue to use electricity for hard charging, causing the cylinder to remain stuck and the current to surge. Within a few minutes, the motor burns out directly, doubling the repair cost.
Parallel idle units should be regularly turned on and run for a few minutes every week during the off-season to maintain the friction surface oil film and prevent static locking.
Long distance sea freight units for foreign trade are subject to high temperatures and humidity at sea, which can easily cause them to lock up after being left idle for a long time. Therefore, it is recommended to preheat the crankcase before attempting to jog it upon arrival at the port.
After repairing the stuck cylinder, it is necessary to thoroughly clean the system, replace the dry filter, and replace the refrigeration oil, otherwise impurities will stick to the cylinder again.
The phenomenon of cylinder jamming and capacitor failure is very similar. First, measure the capacitor and voltage to eliminate electrical problems, and then determine the mechanical cylinder jamming to avoid disassembling the compressor by mistake.
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FAQ
1. Typical phenomenon of stuck cylinder electrification? Buzzing sound, thermal protection immediately tripped.
Why is liquid impact cylinder jamming the most harmful? Liquids are incompressible and can easily damage the cylinder body valve plates.
How to prevent static locking? Idle units are regularly started for short periods of time to retain the oil film.
Can the stuck cylinder be continuously impacted by electricity for a long time? No, it's very easy to burn out the motor.
What must be done after repairing the stuck cylinder? Clean the system, change the oil, and replace the dry filter.
How to distinguish between stuck cylinder and damaged capacitor? First, measure the capacitance.
What are the reasons why new sea freight machines are prone to lock up? Long term standing causes oil film loss on the friction surface.
