2205Q2JE-HO-S6-N_2020.01.
Chapter 5 Maintenance and Inspection
SCV-series Screw Compressor 5.5 Reassembly
5-50
5.5.11 Shaft Seal Block
The BBSE (balance bellows single) type of the mechanical seal assemblies used in current standard
screw compressors as standard specification.
There are other cases where the BOS (balance O-ring single) type seals are used, according to the
specification by the customer.
Figure 5-19 BBSE type Mechanical Seal Assembly and Related Parts
a) Before installing the mechanical seal, clean the seal
installation area on the rotor shaft. In particular,
immediately prior to the assembly, check again that no
flaw is present on the step area of the shaft where the seal
is to be installed.
b) Install the oil seal [50] on the seal retainer [48]. The
installation orientation of the oil seal has been reversed in
November 2002 as a design change. While the oil seal
had been installed with the oil seal lip facing the direction
of the atmosphere, the direction was reversed. This is
because excessively high pressure should be avoided by
helping the escape of oil from the seal box.
Using a Teflon block or the like as a pad (right above
picture), lightly hit the pad to push the oil seal evenly into
the retainer until it is fully seated. Once the oil seal is fully
inserted, you can easily sense it as the hitting sound as
well as the response will change.
After the installation, check that the level difference with
the retainer is uniform and that the oil seal is evenly
inserted by observing the condition from the opposite side.
c) Insert the O-ring [744] into the inner circumference of the
oil seal sleeve [528], and install the sleeve into the oil seal
retainer with an O-ring inserted as shown in the right
picture.
Note: The oil seal sleeve is not used in 160V** models.
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