目前Oil-free air compressorIt is improved and developed on the basis of oil air compressor.There are two main ways to do this: one is to use water instead of oil,The other is to coat the rotor with a self-lubricating coating,Because the high-speed bearings at both ends of the rotor need oil lubrication,Therefore, it is necessary to seal the lubrication space of the rotor bearing with the compression space of the rotor,It is precisely because of this high-speed seal that the processing accuracy of the oil-free air compressor is quite high,The cost is huge.And there is a huge problem is that no matter how good the technical seal is damaged.Once the main engine head of the oil-free air compressor fails, because it is too accurate, the main engine head can only be repaired back to the manufacturer, greatly increasing the unrepairability, even if it can be repaired, it needs to pay a huge amount of money and a great deal of maintenance time.Therefore, it is not best for large enterprises not to blindly purchase oil-free air compressors, oil and oil-free air compressors generally refer to the amount of oil content of the air compressor exhaust port, generally there is a large oil content of the oil machine, and the oil content of the oil-free machine is 0.01ppm，Therefore, this oil content is used to distinguish between air compressors with oil and without oil.There is also a completely oil-free air compressor，It is not lubricated with oil，It is lubricated with a resinous material，Therefore, the final discharged gas does not contain oil, which is called an oil-free air compressor，However, at present, the quality of this air compressor is not very meaningful，                The domestic general is oil-lubricated oil-free machine. The air in the air compressor reservoir occupies a certain space, but it has no fixed shape and volume。When pressure is applied to the air in a closed container, the volume of the air is compressed, increasing the internal pressure。When the external force is withdrawn, the air will return to its original volume under the action of internal pressure。If there is a movable object in the container, when the air returns to its original volume, the object will be pushed outward by the pressure of the air in the container。 This principle is widely used in production and life。For example: the ball into the compressed air, the more gas, the harder the ball;The tires can bear a certain amount of weight by pumping compressed air into them。On large cars, doors and brakes are closed with compressed air;