Core Hazards of Excessive Lubricant Viscosity

In refrigeration equipment such as compressors, excessively high lubricant viscosity does not mean "more thorough lubrication"; instead, it causes multiple hazards that severely impact equipment operation and service life.

Firstly, it exacerbates friction loss and component wear. The core function of lubricants is to form a uniform oil film to isolate moving parts. When viscosity is too high, the oil film's fluidity deteriorates, failing to quickly fill micro in component gaps. This leads to a transition from "liquid friction" to "semi-dry friction" or even "boundary friction", significantly increasing the friction coefficient. Over time, critical components such as bearings, pistons, and crankshafts will suffer abrasive wear, adhesive wear, resulting in irreversible damage like scratches and seizure, drastically shortening their replacement cycles.

Secondly, it increases energy consumption and operational costs. Excessively high viscosity enhances internal friction within the lubricant. Compressors must consume more power to overcome this resistance, driving lubricant circulation and component movement. This directly leads to increased friction power, heavier motor loads, and a significant rise in electricity consumption per unit time. For long-running industrial equipment such as cold storage units and central air conditioning systems, cumulative energy waste results in substantial economic losses.

Additionally, it increases startup resistance and fault risks. During startup, when lubricants are not fully heated, high viscosity creates a "gel-like" resistance, causing a sharp increase in startup torque. This can easily lead to motor overload, tripping, or coil burnout, and may also cause component jamming, damaging startup mechanisms and couplings.

Furthermore, high viscosity reduces heat dissipation efficiency, leading to overheating operation of the equipment. This accelerates lubricant oxidation and degradation, generating sludge and carbon deposits that clog oil passages, creating a vicious cycle. It also affects sealing performance, causing leakage of lubricants and refrigerants. This not only wastes lubricants but also disrupts system pressure balance, posing safety hazards.