2200LZJE-HO-C6-N_2013.12.
Chapter 2 Configuration and Specifications of Compressor
Compound 2-stage Screw Compressor 2016**C 2.4 Configuration of Compressor
2-9
2.4 Configuration of Compressor
For names of each part of the compressor, refer to "7.1 Development Views, Assembly Sectional
Views ", and "7.2 Parts Configuration Table".
2.4.1 Sectional View
Figure 2-6 2016**C Screw Compressor Sectional View
The 2016**C model, a compound 2-stage compressor, consists of two compressors, (i) a low-stage
compressor which suctions gas, working fluid, from the refrigerating unit and compresses (pressure-raises)
the gas and (ii) an high-stage compressor which furthermore compresses the gas that has been
pressure-raised by the low-stage compressor and sends the resulting gas to the equipment side.
In each casing (low-stage, high-stage), two screw rotors with long leads are supported on both ends by
bearings. They are meshed with each other in a joint assembly. These two screw rotors are a set of a male
rotor having 4 protruding tooth profiles (M rotor) and a female rotor having 6 concave profiles (F rotor). They
conduct compressing according to the mechanism explained below.
The standard compressor's M rotor is driven by a 2-pole motor; it operates at 3000 rpm (50 Hz) or 3600 rpm
(60 Hz). F rotor operates at 2000 rpm (50 Hz) or 2400 rpm (60 Hz), conforming to the operation of M rotor.
* The actual speed of a motor is less than its calculated speed (synchronous speed). This difference is
caused by slipping of the motor rotor.
The shaft of the low-stage compressor's M rotor which is linked with the motor has a mechanical seal that
keeps gas and lubricating oil from escaping from inside the compressor.
For high efficient operation, the 2016**C model has a capacity control mechanism for coping with load
change on the low-stage, and a capacity control mechanism for reducing startup load on the high-stage.
Suction port
Discharge port
Low-stage
capacity control
mechanism
High-stage capacity
control mechanism
Low-stage
compressor
High-stage compressor
Mechanical seal
Low-stage
discharge port
High-stage suction port
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