2026-04-15Views：
Micro-oil screw compressor and oil-injected screw compressor are two common types of screw air compressors, which are significantly different in lubrication mode, working principle, application scenario and maintenance requirements. Here are the specific differences between the two:
micro-oil screw compressor:
lubrication method: Only use trace amounts of lubricating oil in key parts such as bearings and gears, and the compression chamber does not directly contact the oil.
Working principle: Compress the gas by rotating two intermeshing screws. Trace lubricating oil mainly plays a role in reducing friction and cooling, and does not enter the compression chamber.
Features: The output gas has extremely low oil content (usually ≤ 1-3 mg/m & sup3;), and no oil and gas separator is required.
oil-injected screw compressor:
lubrication method: The lubricating oil is directly injected during the compression process to form an oil film to lubricate the screw and cool the gas.
Working principle: The gas is mixed with a large amount of lubricating oil to achieve efficient sealing and cooling, but the output gas contains trace oil (to be processed by an oil and gas separator).
Features: High single-stage pressure ratio (up to 8-13), high efficiency and low noise.
| Contrast Item | micro-oil screw compressor | oil-injected screw compressor |
|---|---|---|
| advantages | -Clean output gas (low oil content) -Low maintenance costs -Good environmental protection (less lubricating oil consumption) | -Single stage high pressure ratio -High efficiency -Low noise |
| disadvantages | -The pressure range is small (usually ≤ 1.2MPa) -Long-term high-load operation may cause bearing wear | -To be equipped with oil and gas separator -Large consumption of lubricating oil -There is a risk of oil and gas pollution |
micro-oil screw compressor:
applicable Scenarios industries with high requirements for gas cleanliness, such as food processing, medicine, electronics (oil-free compressed air), precision instrument manufacturing, etc.
Case medical oxygen supply, food packaging pneumatic conveying, semiconductor production clean workshop.
oil-injected screw compressor:
applicable Scenarios: General industrial scenarios, not sensitive to gas oil content, such as machinery manufacturing, mining, construction, textiles, etc.
Case: Pneumatic tool drive, concrete mixing, tire manufacturing compressed air supply.
micro-oil screw compressor:
maintenance Focus: Bearing and sealing system, no need to change lubricating oil frequently.
Cost maintenance costs are low, but the initial investment may be high (due to precision machining needs).
oil-injected screw compressor:
maintenance Focus regularly replace the lubricating oil and oil-gas separation filter element, and clean the oil system.
Cost: Maintenance costs are higher, but equipment prices are usually lower than micro-oil screw compressors.
| Parameters | micro-oil screw compressor | oil-injected screw compressor |
|---|---|---|
| pressure range | usually ≤ 1.2MPa | up to above 3.5MPa |
| exhaust temperature | lower (cooling due to trace lubrication) | higher (cooling by injection) |
| noise level | low (due to no oil/gas shock) | lower (due to oil film buffer) |
| equipment life | dependent bearing life | dependence on oil system maintenance quality |
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