I. Core Functions and Working Principle of Atlas Copco SEPARATOR OIL SPARE
Filtering impurities
During the operation of a spray oil screw compressor, lubricating oil will mix with trace dust in the compressed air, metal particles generated by rotor wear, and sludge formed by oil oxidation. The oil filter uses internal filter materials to intercept these impurities (typically capable of filtering particles ranging from 5 to 20 μm), preventing them from entering the rotor mesh surfaces, bearings, and other precision parts, thus avoiding scratches or jamming.
Ensuring the stability of the oil film
Clean lubricating oil can form a stable oil film on the rotor and bearing surfaces, reducing friction loss. If there are too many impurities, the oil film is easily damaged, potentially leading to rotor seizing, bearing overheating, and other serious faults.
Extending the lifespan of the oil
The filtered lubricating oil has a slower oxidation rate, which can extend the replacement cycle (combined with regular oil replacement, the oil filter and lubricating oil are usually replaced simultaneously).
Working process:
Lubricating oil enters the oil filter from the inlet, passes through the filter material for filtration, and the clean oil flows from the outlet to the various lubrication points of the main unit, with impurities being retained within the filter material or on its surface. When the oil filter becomes clogged, the built-in bypass valve will automatically open (usually when the pressure difference exceeds 0.2 to 0.3 MPa), ensuring that the lubricating oil does not stop (emergency protection, but the unfiltered oil will enter the system and needs to be replaced as soon as possible).
II. Structure and Types of Atlas Copco SEPARATOR OIL SPARE
1. Basic Structure
Filter material: The mainstream is resin-impregnated paper filter material (large filtration area, high efficiency), some high-end models use composite fiber filter material (such as glass fiber + polyester fiber, balancing filtration accuracy and dust capacity); in harsh working conditions, metal mesh filter material can be selected (reusable, but with lower filtration accuracy).
Shell: Iron sheet or engineering plastic shell, with certain pressure resistance (usually ≥ 1.6 MPa, matching the system oil pressure).
Bypass valve: Key protective component, composed of a spring and valve plate, ensuring that the oil filter is clogged, the lubricating oil can still flow.
Sealing piece: Rubber sealing ring (such as nitrile rubber, resistant to oil), preventing unfiltered oil from leaking from the interface.
2. Common Types
Full-flow oil filter: Connected in series in the main oil passage, all lubricating oil must pass through filtration before entering the main unit, it is the main filtration device of the spray oil screw compressor (the most widely used).
Split-flow oil filter: Only filters a portion of the lubricating oil (about 10% to 20%), with higher precision (able to filter out impurities smaller than 3 μm), usually used in conjunction with the full-flow oil filter, for further purification of the oil (commonly seen in large screw compressors).
III. Selection and Key Parameters of Atlas Copco SEPARATOR OIL SPARE
Filter accuracy: Selected according to the requirements of the main unit, generally 5 to 10 μm (precision models can reach 3 μm), too high a precision will increase oil resistance, requiring matching of the oil pump flow rate.
Rated flow: Needs to match the output flow rate of the compressor's lubricating oil pump (such as 50 to 200 L/min), ensuring smooth oil flow.
Bypass valve opening pressure: Commonly 0.25 to 0.4 MPa, needs to match the system oil pressure (avoid opening too early or too late).
Interface specification: Threaded interface (such as M20×1.5, G3/4) or flange connection, needs to match the oil filter base.
Dust capacity: The total amount of impurities that the oil filter can accommodate (such as 30 to 100 g), the larger the dust capacity, the longer the replacement cycle (reducing maintenance frequency).
