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Back to liquid is a common system problems , back of a hazard that was diluted lubricants. After the arrival of oil diluted friction surface , the viscosity is low, not enough to form a protective film thickness over time can cause wear and tear. Back when liquid than larger , oil will be very thin, not only lubricates , but also dissolve erosion original film , causing the refrigerant erosion.
For various reasons ( including the compressor start-up phase ) did not get the lubricant friction surface temperature will quickly rise over 175 ° C after the oil begins to decompose. " Insufficient lubrication - Friction - Surface temperature - oil decomposition " is a classic vicious cycle , many fatal accidents , including rod axle , live Fonseca cylinder are related to this vicious cycle .
Insufficient lubrication and starvation phenomenon can be seen in the open compressor . General performance of starvation large area , a relatively uniform surface damage and high temperature , insufficient lubrication and more in certain parts of the wear , scratches and high temperature , such as away from the bearing surface, such as the oil pump .
When the piston moves up and down , the load piston pin is between the upper and lower bearing surfaces of rotation , which allows oil to brush evenly over the piston pin , and provide adequate lubrication. If the exhaust valve bent or broken , or the high-pressure compressor ratio of long-term work that will cause the piston pin unilateral insufficient lubrication and wear , porosity increases. There are shaking piston pin clearance , the piston will stop at the point of being thrown and hit the valve and the valve plate , resulting in a crash . Thus , the replacement valve films , you should check the piston pin wear.
4 . Conclusions and recommendations
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