In the long-term use of screw vacuum pump, there may be problems: oil return. In addition to the screw vacuum pump without check device, this phenomenon is more obvious when the screw vacuum pump stops working. Taking measures in time can reduce the loss. The placement position of the screw vacuum pump has nothing to do with the return oil.
When the pump stops, the oil circuit is cut off, the negative pressure in the vacuum pump cavity of the pump is eliminated, the liquid level difference is reduced, and the oil return quantity is reduced. This is the basic principle to prevent oil return. The shaft seal and static seal of the screw vacuum pump shall be reliable and replaced when appropriate. The oil near the exhaust valve of the screw vacuum pump shall be separated from the rest of the oil. The oil level is only slightly higher than the partition wall?
The surface of the valve seat of screw vacuum pump should be flat, and the elasticity of the valve plate should be good? Set check valve structure, screw vacuum pump will automatically close the oil inlet when it stops, move the fuel tank and exhaust valve to one side to reduce the oil level and oil volume, add a pipe in the oil hole of screw vacuum pump, so that the oil level is only slightly higher than the oil inlet.
Screw vacuum pump suction valve? Screw vacuum pump and auxiliary structure are set to cut off the oil circuit when the pump is stopped? After stopping the pump, the suction port can be filled with gas to ensure the pressure balance at both ends of the screw vacuum pump. It is recommended to replace the check valve at the air inlet. Because of the vacuum pumping, when the screw vacuum pump stops running, the air pressure in the vacuum cavity is lower than the external pressure, the oil in the screw vacuum pump will be pumped out, resulting in oil return.
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