Centrifugal compressor
Thread Content
I would like to ask the experts: why does a centrifugal compressor need to be pressurized to 0.1–0.2 MPa before it can be started? Please provide a detailed explanation!
1. Sealing: Whether it is a dry gas seal or an oil film seal, a certain pressure difference is required to ensure that material can pass between the moving and stationary parts and to prevent oil from entering the cylinder. 2. Surge prevention: Ensure sufficient flow rate and compression ratio to prevent the unit from surging. 3. Carry away heat. 4. Balance the axial force. 5. Others, such as negative pressure, etc. However, it is not absolutely impossible to start under normal pressure; it is possible in certain situations
Prevent the sealing oil from entering the cylinder block through the shaft seal; in the case of a dry gas seal, prevent the pressure of the secondary sealing gas from pushing the primary moving ring away, which could lead to a situation where the primary moving ring cannot be returned to its original position.
I have never used a centrifuge before; I would like to ask where the pressure is applied
Centrifugal air compressors never start without being pressurized~~~~~~The possibilities mentioned in points 2, 3, 4, and 5 on the 3rd floor can be ruled out.
The poster might be referring to the startup after the dry gas sealing system has been put into use. Before the dry gas seal system is put into use, the compressor pressure must be zero.