2203M4JE-MY-iS2-N_2017.04.
Chapter 5 Maintenance
Screw Compressor i-series 5.5 Reassembly
5-30
g) By using two seal collar set screws [111], tighten the seal collar against the countersunk holes in the
rotor shaft. Tightening the seal collar at other places than the countersunk holes can cause damage
to the rotor shaft which can lead to leakage.
h) Attach the O-ring [103] for mating ring and mating ring [101] to seal cover [51].
Photo 037
Tightening Seal Collar Set Screw Photo 038 After Assembly of Mating Ring
i) Apply oil to seal cover gasket [52], align the gasket oil hole with the bearing cover oil hole, and affix
gasket to the flange.
* The i-series compressors employ the standard internal oil supply type. With this type, the bearing
cover and the seal cover are connected by drilled oil supply holes. Oil flows through the notch in
seal cover to upper side of seal cover, and then goes through the drilled oil supply holes to the
sliding surfaces of mechanical seal assembly.
j) Install the seal cover with the gasket, so that the oil removal piping of the seal cover is on the bottom
side. At this time, assemble it carefully, either at a right angle or by delaying the upper side slightly,
while paying attention not to cause the mating ring inside the seal cover hit against the rotor shaft.
The seal collar and mating ring sliding surface will come into contact midway through attachment.
At this moment, check the dimensions between the seal cover gasket and the bearing cover flange
surface by using a taper gauge. This value is called " fastening margin" for seal.
It is used when checking the sliding surface pressure between the rotating ring and stationary ring of
the seal. If this value is not within the range shown in Table 5-17, measures should be taken, such
as replacement of mechanical seal assembly or addition of another gasket.
With i-series compressor, the thickness of the seal cover gasket is 0.5 mm.
In case of BBSE-type seal of the i-series compressor, make sure that this value is in the range of 2
to 3 mm.
Table 5-17
Fastening Margin for Seal
Seal Bearing cover
Cover
* The hatched portion represents gasket.
Photo 039 Figure 5-6
Checking Fastening Margin
Checking Tightening Allowance
Model BBSE seal
i125* 2.0 to 3.0 mm
i160* 2.0 to 3.0 mm
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