Screw air compressor air end spraying oil out's reason
What are the reasons and preventive measures of the screw air compressor air end spraying oil out?
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What are the reasons and preventive measures of the screw air compressor air end spraying oil out?
Nov 25, 2021
Screw air compressor fuel injection refers to the outward fuel injection from the air compressor's air inlet. It usually happens when the air compressor is shut down suddenly, such as the air compressor motor loses power or manual emergency shutdown. At this time, the air compressor suddenly shuts down without opening the relief valve in time to discharge the remaining gas from the air compressor's oil and gas barrels. If the intake check valve is too late to close, The air compressor air inlet will spray lubricating oil outward.
When the screw air compressor is injected with oil, first check whether the oil cut-off solenoid valve is faulty. If it is normal, you should further check whether the check valve on the main exhaust pipe can be closed in time or whether it is closed completely, such as Faults should be eliminated. At present, twin-screw air compressors generally no longer install oil cut-off solenoid valves, so the main reason for fuel injection is check valves. It is recommended to use stainless steel valves for the selection of check valves, because the compressed air contains moisture, the oxidation and corrosion rate of ordinary cast iron valves is very fast, causing the check valves to rust and jam and close loosely.
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Once the power is cut off, the solenoid valve will close and the intake butterfly valve will be closed and initially isolated. However, the intake butterfly valve usually has vents or gaps, which cannot be completely isolated from the outside.
The weight check valve feels the pressure change and closes in an emergency. Effective is also a measure to prevent spitting oil afterwards. At present, twin-screw air compressors generally do not install oil shut-off valves. After shutting down, they are blocked by a check valve. When the pressure of the oil to the air end is reduced to zero inside the machine, it will return to the oil and gas barrel under the action of gravity. The heavy hammer check valve is In the current effective way, some manufacturers generally use piston-type intake valves (or poppet valves) in order to save costs, and use spring-controlled pistons to play the dual role of intake adjustment and non-return. Piston wear is inevitable over time. Oil spit will occur during shutdown, even if it is shut down normally, oil spit will also occur during shutdown.
Therefore, manufacturers of this type of intake valve generally require 3000-5000h to replace the piston.
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