I earnestly seek advice from experts: the relationship between dry gas seal clearance and axial displacement
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What is the relationship between the gap between the stationary and rotating rings of a dry gas seal and the axial displacement (play) of the compressor shaft? ? ? After all, this gap is only 3 to 5 micrometers, while the axial displacement can reach 1 millimeter.
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Your question stems from a misunderstanding of the compression amount and the displacement of the moving and stationary rings; the two are not the same concept. Just from a literal perspective, the air gap has no relation to shaft play
The gap between the rotating and stationary rings is maintained by a rigid air film that pushes back the spring; it has no direct relation to axial movement. Generally, dry gas seals allow an axial movement of about 3–5 mm, which is much larger than the thrust clearance of compressors, so the seal will not be damaged
Sealing gas is a type of sealing that prevents the leakage of the medium due to the pressure difference with the medium itself； Axial force is the change in axial force resulting from changes in the rotor structure and loads. For reference.
【Reply to Floor 3】 The rotating ring is fixed on the shaft and rotates together with it, while the stationary ring is mounted on the housing and does not rotate with the shaft, is that correct?
Could it be that the entire dry gas seal rotates together with the compressor shaft? ? ?
How is that possible? The shaft sleeve of the dry gas seal is rotating, and a moving ring is installed on the shaft sleeve.
The moving ring is mounted on the shaft sleeve and rotates together with the shaft