The oil return pipe of the screw air compressor is an important part of the oil circulation system. Its main functions include:

1.Stable oil return: The oil return pipe smoothly draws the lubricating oil at the bottom of the oil-gas separator back into the compressor casing to maintain the stability of the oil circuit circulation.

2.Prevent oil loss: The oil return pipe is equipped with a filter, oil sight glass and throttle hole, which ensures stable oil return and prevents oil droplets from being carried away by the air flow again.

3.Secondary oil return: A small amount of lubricating oil at the bottom of the oil-gas separator filter element is pumped back into the compressor housing through the oil return pipe for secondary use.

4.Avoid the decline of oil separation effect: a one-way valve and a flow-limiting hole are installed on the oil return pipe to prevent the oil-gas mixture from flowing back to the oil separator during shutdown, which will affect the oil separation effect.

5.Ensure the exhaust volume: By controlling the flow of the oil return pipe, avoid excessive oil and gas reflux leading to loss of air compressor exhaust volume.

6.Prevent oil flying: A return oil check valve is installed at the position where the return oil pipe connects to the screw main unit to prevent the lubricating oil in the machine head from flowing back to the oil separator after shutdown.

7.Maintaining the internal pressure of the compressor: The oil return pipe helps maintain the pressure balance inside the compressor to ensure the normal operation of the system.

The maintenance and correct installation of the oil return pipe are crucial to the stable operation of the screw air compressor. It is necessary to regularly check whether the oil return pipe is unobstructed and whether there is any damage or wear to ensure the efficient operation of the oil circulation system.