MovinCool Office Pro W20 Service Manual - Manual (Page 22)

Operation Section
22
(4) Compressor lubrication
•The lubrication system is comprised of a hollow
shaft, an oil scraper mounted at the end face,
hollow shaft, a shaft journal (shaft bearing),
and the lubrication groove for the shaft journal.
The lubrication groove is wider than the oil
hole. When the shaft turns, oil is scraped
upward by the oil scraper along the inside
diameter of the hollow shaft. The oil is fed
through the oil hole by centrifugal force, then
supplied to the lubrication groove for each
shaft journal, lubricating the bearing. In this
lubrication system, oil enters into each bearing
separately and returns to the oil reservoir. This
system effectively prevents bearing
temperature increases, and offers high
reliability. In addition, the specially treated
shaft journal keeps the bearing from being damaged during high temperature operation.
4.3 Condenser
• The condenser is a heat exchanger with coaxial tubes. The inner tube is a copper tube in which the
water flows. The outer tube is a steel tube. The refrigerant flows between inner tube and outer tube.
• Heat is given off and absorbed by the water being passed through the condenser and then
expelled through the water outlet.
4.4 Capillary Tube
• The capillary tube is a long thin tube utilizing
line flow resistance to serve as an expansion
valve. The length and the inner diameter of the
capillary tube are determined by the capacity of
the refrigeration system, specified operating
conditions, and the amount of refrigerant. The
capillary tube causes the high pressure, high
temperature liquid refrigerant sent from the
condenser to expand rapidly as the refrigerant
is sprayed out through the fixed orifice in the capillary tube. As a result, the temperature and
state of the refrigerant becomes low and mist-like respectively, causing it to evaporate easily.
I001680
Oil Feed Groove
Oil Hole Oil Scrapper
Roller
Rotor
Cylinder
Hollow Shaft
Eccentric Shaft
I001887
High Temp./High Pressure
Liquid Refrigerant
Low Temp./Low Pressure
Gas and Liquid Mixture