Failure Modes and Risk Assessment of Rotary Compressor under Extraordinary Operating Conditions

摘要

Under an extraordinary operating condition, any rotary compressor will eventually fail if the condition is harsh enough and/or lasts long enough. Rotary compressor, in reality, can be exposed to and operates under a variety of conditions that only can be classified as extraordinary. Cases in points are absence, lack or excessive amount of oil or refrigerant, blocked heat exchanger surfaces, missing compressor components, wrong refrigerant, absence or wrong overload protector and electrical miswiring. This paper examines what kinds of failure mode such extraordinary operating conditions lead to. Analyses of customers' line and field return compressors and various tests simulated in the laboratory are discussed. Failure modes are then classified by likelihood of occurrence, detectability and severity of the fatality. The resultant analyses help failure mode analysis, failure cause determination, and warranty administration. Engineers in testing reliability, design, development or quality control are all to benefit from the knowledge obtained in this paper.