035-19569-101 (0109)
2-3
GB
2.3 Compressor
The compressor is a single-stage centrifugal type
powered by an open-drive electric motor.
The rotor assembly consists of a heat-treated alloy steel
drive shaft and impeller shaft with a cast aluminum,
fully shrouded impeller. The impeller is designed for
balanced thrust and is dynamically balanced and over-
speed tested.
The inserted type journal and thrust bearings are
fabricated of aluminum alloy. Single helical gears with
crowned teeth are designed so that more than one tooth
is in contact at all times. Gears are integrally assembled
in the compressor rotor support and are fi lm lubricated.
Each gear is individually mounted in its own journal and
thrust bearings.
The open-drive compressor shaft seal is a double bellows
cartridge style with ceramic internal and atmospheric
seal faces. The seal is oil-fl ooded at all times and is
pressure-lubricated during operation.
Figure 2.3 YK Centrifugal Liquid Chiller (Rear View)
2.4 Compressor Lubrication System
(Figure 2.4)
The chiller lubrication system consists of the oil pump,
oil fi lter, oil cooler and all interconnecting oil piping and
passages. The main points within the compressor which
must be supplied with forced lubrication:
1. Compressor Drive Shaft (Low Speed)
a. Shaft seal.
b. Front and rear journal bearings –
one on each side of driving gear.
c. Low speed thrust bearing
(forward and reverse).
2. Compressor Driven Shaft (High Speed)
a. Forward and reverse high speed thrust
bearing.
b. Two journal bearings.
3. Speed Increasing Gears
a. Meshing surfaces of drive and pinion gear
teeth.
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