1. why oil-free air compressor maintenance is essential?
oil-free air compressor is widely used in food processing, medical and pharmaceutical, electronic semiconductor, textile and chemical fiber, spraying and sandblasting and other industries with high air quality requirements because of its oil-free and pollution-free output gas.
However, because of the oil-free design, its core components (such as piston rings, packings, diaphragms, scrolls, etc.) lack the protection of lubricating oil during operation, and thewear rate is usually 30% faster than that of oil models. -50%.
If you do not do a good job of maintenance, light will appear:
- Exhaust volume decreases and production efficiency decreases
- Energy consumption increases significantly, electricity bills soar
- Host wear increases, maintenance costs are high
Heavy
may result in:
- Equipment suddenly shut down, affecting the entire production line
- Core components scrapped, need to be replaced as a whole, the cost can reach tens of thousands of yuan
A summary of the
sentence: maintenance done well, oil-free air compressor for more than 3 to 5 years is not a dream.
2. oil-free air compressor daily maintenance (daily/per shift)
Daily maintenance is the most basic and important link in the maintenance of oil-free air compressor. It is recommended that each shift should be carefully implemented.
1. Check and drain the condensate
oil-free air compressor will produce a large amount of condensed water during operation. If it is not discharged in time, it will cause rust of the gas storage tank, corrosion of the pipeline, and excessive water content of the gas, which will seriously affect the quality of the gas.
Operation methodof
:
- Open the tank bottom drain valve
- After the water is drained, close the valve
- recommended to discharge at least 2 to 3 times (morning, middle and evening)
tightly.
It is
2. Check the operation parameters
After the
is turned on every day, observe and record the following key data:
| Inspection Items | normal range | Exception Handling |
|---|---|---|
| Exhaust pressure | 0.7-0.8 MPa (depending on model) | Pressure too low → check for leakage; pressure too high → check pressure switch |
| Exhaust temperature | ≤100℃ (air-cooled) | The temperature is too high → check whether the cooling fan and air inlet are blocked |
| Operating current | 80% of rated current -100% | Current excessive → may be overloaded or host fault |
| Operating noise | Steady, no abnormal sound | Percussion sound → stop immediately for inspection |
3. Clean the air inlet filter element
The air intake quality of
oil-free air compressor directly affects the life of the main engine. Once the air intake filter is blocked, it will cause insufficient air intake and a decrease in exhaust, and the host will accelerate wear when running under negative pressure.
recommendations:
- Daily visual inspection of the filter element for dust accumulation
- Weekly with compressed air from the inside to the outside purge once
- Every 2000 hours or every six months (depending on the use environment)
4. Check all pipeline connections
- Check whether there is air leakage (soapy water can be used to smear the joint, and bubbles are air leakage)
- Check whether the pipeline is aged or cracked
- Tighten all bolted connection points
3. oil-free air compressor regular maintenance (monthly/quarterly/annual)
In addition to daily maintenance, it also requires in-depth maintenance according to the cycle to truly extend the life of the equipment.
Monthly maintenance (every 500 hours or monthly)
| Maintenance Items | Specific operation |
|---|---|
| Clean cooler (air-cooled type) | Use compressed air to purge the cooling fins and remove dust, cotton and other sundries |
| Check safety valve | Manual lifting test to ensure that the safety valve is flexible and reliable |
| Check belt tension (belt drive type) | Use your fingers to press the belt in the middle, and the pressing amount is 10-15mm as normal |
| Clean the fuselage surface | Keep the equipment tidy and avoid dust from entering the interior |
| Check electrical wiring | Check whether there is looseness, heat, oxidation phenomenon |
Quarterly maintenance (every 2000 hours or quarterly)
| Maintenance Items | Specific operation |
|---|---|
| Replace intake filter element | Regardless of appearance, due must be replaced |
| Checking piston rings/packings (piston models) | Measure the wear amount, if it exceeds the limit value, replace it |
| Check the diaphragm (scroll/diaphragm type) | Check whether the diaphragm has cracks or perforations |
| Clean check valve | Remove and soak with cleaning fluid to ensure that the sealing surface is free of impurities |
| Check and replace grease (if any) | Part of the oil-free type of bearings and other parts still need to be lubricated, according to the manufacturer’s requirements for filling |
| Calibrated pressure gauge/temperature gauge | Ensure meter display is accurate |
Annual maintenance (every 8000 hours or every year)-most important!
| Maintenance Items | Specific operation |
|---|---|
| Comprehensive replacement of wearing parts | Piston ring, packing, intake and exhaust valve plate, sealing ring, etc. |
| Clean or replace the cooler | Air-cooled type cleaning fin; water-cooled type cleaning water jacket, check the water-cooled pipeline |
| Check the main engine bearing | Measure the radial clearance, if it exceeds the limit, replace it |
| Comprehensive inspection of electrical system | Contactors, relays, thermal protectors, etc. |
| Gas tank annual inspection | According to national regulations, pressure vessels need regular inspection |
| Changing grease (full system) | Including gear box, bearing and other parts |
4. different types of oil-free air compressor maintenance focus
| Type | Maintenance focus | Special attention |
|---|---|---|
| oil-free piston type | Piston ring, packing, intake and exhaust valve | Piston ring wear is the biggest killer, be sure to replace |
| oil-free scroll | Scroll plate, anti-rotation mechanism | Do not reverse operation, otherwise the scroll plate is instantly scrapped |
| Oil-free screw type (dry type) | Rotor profile, synchronous gear, bearing | Rotor clearance accuracy requirements are high, it is not recommended to disassemble |
| Oil-free diaphragm type | Diaphragm, valve plate | Diaphragm is a consumable, according to the operating hours of active replacement |
5. oil-free air compressor maintenance of the five major errors
many users in the maintenance of oil-free air compressor easy to make the following mistakes:
Misunderstanding 1: “No oil, no need to change the filter element”
Truth: Oil-free means that there is no oil lubrication in the compression chamber, but the air intake filter element needs to be replaced regularly, otherwise the dust will directly enter the host and wear faster.
Misunderstanding 2: “As long as it can be used, it will not be maintained.”
Truth: The service life of wearing parts of oil-free air compressors is usually only 60% to 70% of that of oil-free air compressors. Non-maintenance is equivalent to accelerated scrapping.
Misunderstanding 3: “Just change your accessories.”
Truth: The core components of the oil-free air compressor (such as diaphragm, scroll, rotor) are precision parts, and it is recommended to use original accessories. Non-original parts may cause performance degradation or even safety accidents.
Misunderstanding four: “do not tube condensate”
the truth: Condensed water will lead to corrosion of gas storage tanks and excessive water content of gas, especially in the food and medical industries, which is absolutely not allowed.
Misunderstanding five: “maintenance is to change the oil”
Truth: Although the oil-free air compressor does not need to add compressor oil, the bearings, gears and other parts may still need grease or lubricating oil. Please strictly follow the manufacturer’s maintenance manual.
6. oil-free air compressor maintenance record table (recommended printing)
| Date | Operating Hours | Drain condensate | Filter element inspection | Pressure/Temperature/Current | Abnormal situation | Operator |
|---|---|---|---|---|---|---|
| Yes/No | Normal/Abnormal | |||||
| Yes/No | Normal/Abnormal |
suggestion: Fill in the record after each maintenance, which is convenient to track the equipment status and is also an important basis for troubleshooting.
7. oil-free air compressor maintenance core formula
in order to facilitate memory, send you a maintenance formula:
Daily exhaust condensation inspection, weekly blowing filter element monthly heat dissipation, quarterly replacement annual overhaul, original parts protection.
| Maintenance frequency | Core Action |
|---|---|
| Every day | Drain condensed water, check parameters and check filter element |
| Weekly | Purge the filter element and check the pipeline |
| Monthly | Clean the cooler and check the safety valve |
| Quarterly | Change the filter element, check the valve and calibrate the instrument |
| Every year | Replacement of wearing parts, comprehensive overhaul, gas tank annual inspection |
oil-free air compressor how to do maintenance? In fact, it is not complicated, the key is to adhere to the daily maintenance, regular maintenance on time, the use of original accessories. A properly maintained oil-free air compressor can not only stably output clean compressed air, but also help enterprises save a lot of maintenance costs.