wsm M6060, Workshop Manual

Page: 575 / 639

CABIN M6060, M7060, WSM
9-M2
[2] COMPRESSOR
The vane type compressor installed on this cabin is
composed of a cylinder (1) with an oval cross section
and a rotor (2) with five vanes (3). The vane type
compressor is provided with two suction ports and two
discharge ports respectively.
The five vanes (3) mounted on the rotor (2), rotating
along the inner wall of the cylinder (1), keeps
air-tightness using the centrifugal force of the rotor (2)
and the back pressure of the vanes (3) that grow in
proportion to the rotating speed of the rotor (2).
As a result, the volumes of the five cylinder
chambers separated with the cylinder (1) and the five
vanes (3) change.
For each rotation of the rotor (2), each of the cylinder
chambers performs two cycles of inhalation,
compression, and discharge.
9Y1210828CAM0002US0
Operation
In proportion to the rotation of the rotor (3), a volume
of a cylinder chamber separated with the cylinder (1) and
the vanes (4) increases. The cylinder chamber inhales
refrigerant gas from the suction port (2).
As the rotor (3) rotates further, a volume of the
cylinder chamber separated with the cylinder (1) and the
vanes (4) decreases, and the refrigerant gas is
compressed. As the rotor (3) rotates even further, the
refrigerant gas is highly compressed and then presses
the discharge valve to open. The refrigerant gas is
discharged from the discharge port (5).
9Y1210828CAM0003US0
Compressor Oil
The compressor oil dissolves in the refrigerant, circulates through the air-conditioning cycle, and functions to
lubricate the compressor. But the conventional compressor oil for R12 does not dissolve in R134a, so it does not
circulate through the cycle, and the lifespan of the compressor is considerably shortened.
It is still essential to ensure that the correct refrigerant oil is used. R12 systems were lubricated with mineral oil,
which is totally unsuitable for R134a systems. The letter require PAG oil, which mixes very well with the refrigerant
and provides ideal lubrication throughout the system.
*PAG: Polyalkyleneglycol (Synthetic oil)
9Y1210828CAM0004US0
(1) Cylinder
(2) Rotor (3) Vane
(1) Cylinder
(2) Suction Port
(3) Rotor
(4) Vane
(5) Discharge Port (A) Compression Process
(B) Discharge Process
(C) Suction Process
Quantity (Total) Brand Name
100 to 120 cc
0.106 to 0.126 U.S.qts
0.0880 to 0.105 Imp.qts
ND-OIL 8 <PAG* oil>
KiSC issued 08, 2013 A