2200LZJE-HO-C6-N_2013.12.
Chapter 2 Configuration and Specifications of Compressor
Compound 2-stage Screw Compressor 2016**C
2.6
Gas and Oil Flow
2-14
2.6
Gas and Oil Flow
The compression process of the screw compressor is
as described in the preceding paragraphs.
Gas of the compound 2-stage screw compressor
2016**C is sent from the evaporator, and passes
through the strainer and check valve. It is drawn in
from the upper central area (1) of the compressor,
compressed at the lower side near the driving shaft (2),
and then discharged at (3).
(3) and (4) are connected with a pipe.
At the mid point of the pipe, that gas is mixed with
the gas from liquid cooler which was used for supercooling.
Lubricant injected at the low-stage is, while kept mixed
with gas, suctioned from (4) into the high-stage.
After being compressed at (5), the lubricant is discharged
from (6), and is sent from the oil separator to the condenser.
Even if without intermediate gas cooling, oil provides cooling effect.
So, the high-stage discharge temperature is maintained at a temperature not higher than 90°C.
Oil
Supply
Mechanism
As shown in Figure 2-16, lubricant is split into five flows. After completing each role, the oil is mixed with
discharge gas and leaves the compressor. In standard configuration, oil injection is not performed at
the high-stage.
Figure 2-16 2016**C Oil Supply Route
Figure 2-15 Gas Flow
Oil supply header
Low-stage
(1) Oil supply pipe for oil injection
Unloader slide valve
Injection hole
(2)
Oil supply for lubrication
Mechanical seal
Main bearing
Thrust bearing
Side bearing
Gear coupling
Low-stage
Meshed profiles of rotor
Meshed profiles of rotor
(3)
Unloader slide valve
Unloader piston
High-stage suction port
High-stage
(4)
Oil supply for lubrication
Main bearing
Thrust bearing
Side bearing
Balance piston
High-stage
(5)
Unloader slide valve
Unloader piston
High-stage discharge port
