SHAFT SEALING MECHANISM OF COMPRESSOR BY MECHANICAL SEAL

摘要

The mechanical seal (3) includes: a rotary side sliding ring (32) which is supported by the large diameter side outer circumferential face (23) of the annular step section (21) of the rotary shaft (2) via the rotary side O-ring (37) and press-fitted into the annular step section (21) by gas pressure in the device; and an unturnable stationary side sliding ring (31) which is fixed onto the seal housing (1) side via the stationary side O-ring (33) being capable of moving in the axial direction and being able to come into close contact with the sliding protrusion (323) of the rotary side sliding ring (32) due to the spring (36) so that the airtightly sealed sliding face S is formed. The rotary side sliding ring (32) is made of self-lubrication sliding material, and the stationary side sliding ring (31) is made of sliding material, the Young's modulus of which is higher than that of the self-lubrication sliding material. A deforming force given to the rotary side sliding ring (32) in the leaning direction caused by differential pressure between the high gas pressure and the atmospheric pressure outside the device is canceled by a deforming force caused by a component in the axial direction of the differential pressure acting on the annular step section (21) of the rotary shaft (2) in the pressing direction. <IMAGE>