MovinCool Classic 10 Service Manual - Manual (Page 15)

Operation Section 15
(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
copper tubes that are covered with thin
aluminum projections called plate fins.
• Heat is given off and absorbed by air being
pulled across the condenser fins by the
centrifugal fan and then expelled through the
exhaust air duct.
I001680
Oil Feed Groove
Oil Hole Oil Scrapper
Roller
Rotor
Cylinder
Hollow Shaft
Eccentric Shaft
ILL00551-00
4.4 Capillary Tube
• The capillary tube is a long thin tube that
utilizes line flow resistance as an expansion
valve. The length and the inner diameter of the
capillary tube are determined according to the
capacity of the refrigeration system, operating
conditions, and the amount of refrigerant. The
high pressure, high temperature liquid
refrigerant sent from the condenser expands 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, and therefore evaporates easily.
I001887
High Temp./High Pressure
Liquid Refrigerant
Low Temp./Low Pressure
Gas and Liquid Mixture