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Causes and Fault Analysis of Liquid Shock of Refrigeration Compressors in Cold Storage 2

Apr. 11, 2020

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(2) Broken connecting rod

The time of the compression stroke is about 0.02 seconds, and the exhaust process will be shorter. The droplets or liquid in the cylinder must be discharged from the exhaust hole in such a short time, the speed and momentum are great. The situation of the exhaust valve is the same as that of the intake valve, the difference is that the exhaust valve is supported by the limit plate and the spring, and it is not easy to break. When the impact is severe, the limit plate will also be deformed and lifted.

If the liquid does not evaporate and exit the cylinder in time, the piston will compress the liquid when it approaches top dead center. Due to the short time, this process of compressing the liquid seems to be an impact, and the metal knocking sound will also be heard in the cylinder head. Compressed liquid is another part or process of liquid hammering.

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The high pressure generated by the instantaneous liquid impact has a great ring-breaking property. In addition to the bending or even fracture of the connecting rods that are familiar to people at the beginning, other compression force parts (valve plates, valve plate gaskets, crankshafts, pistons, piston pins, etc.) will also be deformed Or damaged, but often overlooked, or confused with excessive steam pressure. When repairing the compressor, people will easily find the bent or broken connecting rods and replace them, and forget to check whether other parts are deformed or damaged, thus laying the root cause for future failures.

The breakage of the connecting rod caused by the liquid hammer is different from the shaft and the piston biting cylinder, which can be distinguished. First of all, the bending or breaking of the connecting rod caused by hydraulic shock occurs in a short time. The pistons and crankshafts at both ends of the connecting rod move freely, and generally there will be no shaft or bite cylinder caused by severe wear. Although the valve chip fragments can occasionally cause severe scratches on the piston and cylinder surfaces after the suction valve chip is broken, surface scratches are very different from wear due to lubrication failure. Secondly, the fracture of the connecting rod caused by liquid hammer is caused by pressure, and the connecting rod and the stubble have squeezing characteristics. Although the connecting rod fracture after the piston bites the cylinder may also be squeezed, but the premise is that the piston must be stuck in the cylinder. The breakage of the connecting rod after holding the shaft is more different. The big end of the connecting rod and the crankshaft are seriously worn. The force that causes the breakage is a shearing force, and the stubble is different. Before holding the shaft and biting the cylinder, the motor will be overloaded, the motor will generate severe heat, and the thermal protector will operate.

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