2205Q2JE-HO-S6-N_2020.01.
Chapter 2 Compressor Specifications and Structure
SCV-series Screw Compressor 2.4 Compressor Structure and Mechanism
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2.4 Compressor Structure and Mechanism
2.4.1 Overview of SCV-series Screw Compressor
SCV-series Screw Compressors are rotary compressors falling into the category of the positive
displacement compressor. The compressor sucks refrigerant gas into a cavity, gradually reduces the
volume of the cavity, and discharge the refrigerant as a high-pressure gas. More specifically, a sealed
cavity is formed by a casing and a pair of intermeshing rotors (called the male = M and female = F
rotors) in the casing. The rotors are different in lead and number of screw lobes. The volume of the
sealed cavity gets reduced as the rotors rotate. The gas trapped in the cavity is thus compressed
before it is discharged.
The SCV-series models feature a mechanism for readily changing the internal volume ratio Vi, which
refers to the ratio between the volume of the cavity just before the start of compression and the volume
of the cavity just before the discharge of the compressed gas.
In addition, the SCV-series compressors employ O-profile screw lobes for the rotors, which minimize
leaks and thus enhance the compression efficiency.
For names and positions of each part of the compressor, refer to Section 7.1 "Exploded Views,
Sectional Views ", and Section 7.2 "Parts Configuration Table" in this manual Chapter 7.
Figure 2-4 Compressor Structure (Representative View of Sideways Discharge Type)
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