REFRIGERATION DIVISION
V SERIES
SCREW COMPRESSOR HANDLING MANUAL
Supersedes all previous version. This information is for reference use only and subject to change without notice
Revision 2 (June 05,2000) Page 13 of 61
1.6 Other Component Mechanisms
a) The radial load of the compressor is absorbed by white meal-lined bearings while the axial
thrust load on the rotors is absorbed by an angular contact ball bearing.
The balance piston of the V-Series compressor M rotor is somewhat larger in diameter than
that of a conventional screw compressor in order to allow for a decrease in the oil pressure
load which is used for pressure difference lubrication.
b) A new, single balance type mechanical shaft seal is used on the drive shaft to protect the shaft
from refrigerant leakage.
The mechanical seal utilizes O-ring packing to allow service with various different refrigerants.
A combination of carbon and metal is used to assure the durability of the frictional parts and
the sealing effect.
c) A cam is provided to indicate the position of the variable Vi slide valve and unloader slide
valve. The capacity control ratio is shown on the dial indicator. Capacity control indication can
be output to a remote indicator using the electric circuit provided.
d) Compressor oil flow
Oil for lubrication and for injection is supplied from a high pressure side oil tank by the
pressure difference with the low pressure side or by an additional pump. Regarding oil
injection, conventional compressors have oil injected into the triangular blow hole in the mating
portion of the unloader slide valve but V-Series compressors utilize a system whereby oil is
supplied from a fixed position on the M rotor side rotor casing.
e) Unlike with conventional screw compressors, oil is also supplied to the F rotor side bearing
directly from the suction cover.
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