The traditional air compressor needs to be refueled before use, while the water lubricated oil-free air compressor adopts water film lubrication technology, the main engine part does not need to be refueled, and only the motor part needs regular maintenance. The following is a specific analysis:
why do 1. traditional air compressors need refueling?
- Lubrication demand:
traditional air compressor (such as oil injection screw type, piston type) through the lubricating oil to achieve the following functions: - cooling: Absorb the heat generated during compression to prevent the equipment from overheating.
- Lubrication: Reduce the friction of metal parts (such as rotors and bearings) and extend the service life.
- Seal: In the screw air compressor, the lubricating oil forms an oil film to prevent the leakage of compressed air.
- Refueling Scene:
- initial start-up: When starting a new machine or after long-term shutdown, check the oil level and add lubricating oil to the scale line of the oil mark.
- Regular maintenance: According to the frequency of use and the environment, replace the lubricating oil every 200-500 hours and clean up the impurities in the oil circuit.
- special environment: Under high temperature or dust environment, it is necessary to shorten the oil change cycle to prevent oil deterioration.
- Consequences of improper refueling:
- lack of oil: Cause component wear, temperature rise, and even cause equipment failure.
- Excessive oil: Increase the motor load, may cause oil emulsification or leakage, pollution of compressed air.
"Non-refueling" Characteristics of 2. Water-lubricated Oil-free Air Compressor
- technical principle:
water-lubricated oil-free air compressor through pure water instead of lubricating oil to achieve the lubrication and cooling of the compression process. Its core design includes: - water film lubrication: A uniform water film is formed on the surface of the rotor to reduce direct metal contact without the participation of lubricating oil.
- sealing structure: Adopt mechanical seal or water seal technology to prevent water from contacting the outside world and avoid external oil pollution.
- Low friction design: Optimize the rotor profile and clearance, reduce the friction coefficient, and further reduce the dependence on lubrication.
- Verification of the host part without refueling:
- exhaust temperature the exhaust temperature of the water-lubricated air compressor is generally not higher than 65°C, which is much lower than that of the traditional model (80-100°C), and there is no need for lubricating oil cooling.
- Oil pollution risk: No oil mist or oil droplets are produced during operation, and the oil content of compressed air is ≤ 0.01 mg/m & sup3;, meeting Class 0 oil-free standard.
- Maintenance records: User feedback shows that there is no need to add lubricating oil to the main part of the water-lubricated air compressor, only the water filter element needs to be replaced regularly and the water quality needs to be checked.
- Maintenance requirements for the motor part:
although the host does not need to be oiled, the motor bearings and other components still need to be lubricated and maintained. Usually: - long-lasting grease: Motor bearings are pre-coated with grease, and the maintenance period is as long as 1-2 years.
- Closed design: Reduce dust entry and extend the service life of grease.
- Periodic inspection: Monitoring the bearing status through the temperature sensor and preventive grease replacement.
Comparison of Advantages of 3. Water Lubricated Oil-free Air Compressor
| characteristics | traditional air compressor | water-lubricated oil-free air compressor |
|---|
| lubrication method | lubricating oil circulation lubrication | pure water film lubrication |
| oil content | 0.1-5 mg/m & sup3;(with oil) | ≤ 0.01 mg/m & sup3;(Class 0 standard) |
| maintenance frequency | oil change every 200-500 hours | only the water filter element needs to be replaced regularly |
| operating costs | high replacement cost of lubricating oil, oil filter and oil core | only water charges and a small amount of maintenance supplies |
| applicable Scenarios | resistant to moisture and dust environment (e. g. mine, metallurgy) | food, pharmaceutical, electronics and other industries with high air quality requirements |
4. user operation suggestions
- pre-startup inspection:
- confirm that there is no oil leakage in the main engine and the motor bearing grease is sufficient.
- Check the water quality (deionized water is recommended) to avoid scale blocking the waterway.
- Open the exhaust valve to discharge the condensed water in the pipeline to prevent water hammer.
- Monitoring in operation:
- observe the exhaust temperature (≤ 65 ℃) and pressure stability, and stop the machine for inspection in case of abnormality.
- Regularly drain the condensate at the bottom of the oil and gas barrel (traditional models need to be drained daily, and water-lubricated models need to be drained weekly).
- Long-term out-of-service maintenance:
- drain the accumulated water in the main engine to prevent corrosion.
- The motor bearing is supplemented with a small amount of grease to prevent dry friction.
