The lubrication technique used to maintain an air compressor's air-end moving smoothly distinguishes oil-free air compressors from oil-filled ones. Oil-injected compressors are used in the majority of industrial air compressors due to their lower cost and longer lifespan compared to oil-free compressors.
The air end of a oil injected air compressor uses oil for lubrication, so the air end does not require maintenance. However, since oil-related accessories need to be replaced, the cost is relatively higher than oil free compressor. Using an oil-free air compressor can reduce the problem of waste oil disposal also.
Maintenance of oil free air compressors only requires the replacement of the air filter and water filter, with a replacement cycle between 1000 to 2000 hours of total operating time. Air end bearing maintenance is recommended after a total operating time of 10,000 hours.
Maintenance of oil injected air compressor requires replacement of air filter element, oil filter element, oil and gas separation element and air compressor oil. The routine maintenance cycle is 3,000 hours. Under normal maintenance, the service life of the air compressor can exceed 100,000 hours.
The fundamental distinction between oil-injected and oil-free compressor maintenance is that the former requires no oil replacement or checking. Furthermore, the oil separator is removed. But, and this is important to note, any gearbox and driving engine will still require lubrication and regular maintenance. In addition, if the compressor is made that manner, grease will be required for the bearings.
Air is compressed as it enters the air compressor, and the compressed air flows into the air receiver tank. Subsequently, it enters the refrigerated dryer for drying, then passes through a three-stage filter to remove impurities from the air before reaching the point of use.
Oil injected air compressor is generally connected to a compressed air storage tank. Then the compressed air is filtered by the primary filter and enters the refrigerated dryer to remove water, then enters the secondary and tertiary precision oil removal filters, and finally reaches the user end.
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The necessity of an oil-free air compressor is usually determined by the specific application. Oil free air compressors are suitable for applications with high requirements for air purity. While the initial cost of purchasing oil free compressors is higher, the subsequent maintenance and operating costs are lower. Oil free compressed air can be directly used in applications involving contact with food and pharmaceuticals. Micro oil air compressors have a lower initial purchase cost and are suitable for most conventional air applications that has no purity requirements for the compressed air.
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