Compressor - Kubota KX080-4 Workshop Manual

KX080-4, WSM

[3] COMPRESSOR

Compressor Oil
The compressor oil is dissolved in the refrigerant and circulates throughout the entire cooling system acting as
the lubricating oil for the compressor. However, because the previously used R12 compressor oil does not dissolve
in R134a, it does not circulate through the cooling cycle. So it drastically reduces the working life of the compressor.
As a result, it is imperative that the right compressor oil is always used. The mineral oil that is used in an R12
cooling system cannot be used in an R134a cooling system. A synthetic PAG oil has to be used in an R134a cooling
system. This oil mixes extremely well with refrigerant gas and provides the entire system with the optimum lubrication.
Volume of Oil
110 to 120 cc
0.116 to 0.127 U.S.qts
0.098 to 0.106 lmp.qts
*PAG : Polyalkylene glycol (synthetic oil)
Product Name
ND–OIL8 <PAG* oil>
5-M3
The vane type of compressor installed in this system
is composed of a cylinder (1) that is elliptical in
cross-section, along with five vanes (3) attached to the
rotor (2). This vane compressor has two each of intake
and discharge ports.
The five vanes (3) are attached to the rotor (2) and
as it rotates, the tips of the vanes come in contact with
the walls of the cylinder (1) and an airtight compression
space is maintained both by the centrifugal force exerted
by the rotor (2) along with the back pressure on the
vanes (3), which is in proportion to the rpms of the rotor
(2).
As a result, the volume changes in each of the five
segments of the cylinder, which are divided by the five
vanes (3) in the cylinder (1).
Each time that the rotor (2) rotates, each of the five
segments of the cylinder goes through two cycles of
intake, compression and discharge.
(1) Cylinder
(2) Rotor
How it Works
As the rotor (3) turns, the volume of space in a
segment, as divided by the cylinder (1) and vanes (4),
increases, sucking refrigerant gas from the intake port
(2) into the cylinder space.
As the rotor (3) turns further, the volume of the space
created between the cylinder (1) and vanes (4)
decreases, compressing the refrigerant gas. As the rotor
(3) continues to turn, the refrigerant gas is compressed
further, putting it under a great deal of pressure, pressing
on the discharge valve and opening it. The refrigerant
gas is then expelled via the discharge port (5).
(1) Cylinder
(2) Intake Port
(3) Rotor
(4) Vane
(5) Discharge Port
CABIN
(3) Vane
RY9212001CAM0003US0
(A) Compression Cycle
(B) Discharge Cycle
(C) Intake Cycle
RY9212001CAM0004US0
RY9212001CAM0005US0
KiSC issued 08, 2015 A