Analysis of Screw Compressor Failure

1Low oil: Thin or no oil film inside the compressor, causing loss of lubrication, dry friction between mechanical components, severe wear, and debris becoming abrasive sand, leading to even more severe wear. This恶性循环 eventually results in seized shafts.

2The refrigeration system is dirty: The dirt itself causes wear between the compressor components, with a single particle equivalent to a sharp knife, leading to an increasing number of particles being scraped off, ultimately causing the shaft to seize.

3Oil filter clog: Leads to return oil issues, resulting in poor lubrication, accelerating wear, and causing the shaft to seize

4Bearings Wear: The wear of the bearings causes the support of the screw shaft to deviate from its original center, resulting in an axis skew. This leads to a reduction in the gap between the screw shaft and the bearing housing on one side, thereby disrupting the lubricating effect of the oil film.;Additionally, the wear of the bearings results in reduced positioning effectiveness of the screw in both axial and radial directions, causing the screw to move erratically. This leads to wear on the compressor's compression chamber and high-pressure end face, and may also cause the shaft to bind or scrape.

5Engine oil aging: The engine oil fails to provide lubrication and remove heat, and temperature has a significant impact on the oil's performance, which leads to the degradation of the oil's properties. This results in increased friction, ultimately causing the shaft to seize.

6System Low on Refrigerant: Once the refrigerant is depleted, heat accumulates in the compressor, causing the temperature to rise, which in turn reduces the oil's viscosity, impairing its lubricating function and leading to wear.

7High condensation temperature: affects oil viscosity, leading to wear.

8Excessive heat load: Affects lubricant viscosity, leading to wear.

Among these issues, oil shortage is relatively common, and the main reasons for oil shortage include:

1.Oil temperature too high, poor oil separation

2.Oil leakage leading to oil deficiency

3.The oil level regulating valve turns unsmoothly, causing abnormal oil volume.

4.The filter is too dirty and cannot return oil normally.

Beijing Zhongqing Changsheng Air Conditioning Technology offers maintenance and repair services for various refrigeration equipment, including central air conditioning systems from brands such as Carrier, York, Trane, McQuay, Climatizer, Tsinghua Tongfang, Dunan, Jinwanzhong, and Belair, as well as screw compressor repairs and maintenance for centrifugal chillers and other central air conditioning systems. Welcome to collaborate 13439989503