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Sunco Blowers www.suncoblowers.com
Phone: 704-545-3922 Pg. 17
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Sunco Blowers
7.4.3. Recommended Oils for Storage
External:
EXXON RUST BAN 326
MOBIL Mobilarma 777 OR 778
SHELL V-Product 9703
Internal:
MOBIL Mobilarma 523 or 524
SHELL RIMULA 30 or ROTELLA T 20W20
7.4.4. Operating after long-term storage
To operate the unit after long-term storage, perform the following:
z
Make sure the rotors rotate smoothly when rotated by hand; the lobe surface and the
air chamber inside are clear.
z
Perform the standard measures for installing a new unit.
Change the lubricating oil.
8. Operational Characteristics and Construction
8.1 Operational Characteristics
To develop pressure and move air, two bi-lobe rotors, synchronized by a pair of timing
gears, rotate in opposite directions in two cylindrical bores within housing.
A defined quantity of air entering the inlet port is trapped between the rotor and the
housing and is carried over to the discharge port against the pressure from the application.
The pressure developed depends upon the resistance of the system as well as the inlet and
discharge pressures.
Each trapped volume occurs two times every revolution for each rotor, commonly referred
to as the volume flow per revolution. Multiplying this by the shaft speed will define the flow
rate entering the inlet port. Changing the rotational speed directly affects the volume flow.
Simultaneously, the synchronized rotors and housing serve to prevent back flow by the
close proximity of the rotors to one another and the proximity of the rotors to the housing.
