Function Of Sihidry Vacuum Pump; Functional Description Of Sihidry M - Model; Figure 6: Section Cut Sihidry M - Model - Flowserve SIHI dry Standard M Series Instruction & Operation Manual

dry dry
dry dry Standard Standard Standard Standard M Series Dry Running Vacuum Pump
SIHI
Issue Date: November 21, 2016
3 Function of SIHI
The SIHIdry Vacuum Pump is intended for use only for the operating conditions indicated by the customer
and confirmed by the supplier. Warranty is undertaken in accordance with the terms and conditions of
sale. The intended use is detailed on the data sheet.
3.1 Functional Description of SIHI
Figure 6: Section Cut SIHIdry M Model
3.2 Functional Description Electronic Synchronization
Copyright:
dry
Vacuum Pump
dry
M- Model
FLOWSERVE SIHI Pumps
Warning!
The SIHIdry Vacuum Pump should only be used for the
application indicated in the data sheet otherwise there could
be a risk to personnel and or the environment.
The SIHIdry system is a dry running vacuum pump. This
two-shaft positive displacement pump with a contact-
less pair of lead screws (C) must be operated vertically.
Synchronization of lead screws is ensured with the help
of a pair of electrical motors (F) so that neither the
synchronization gears (I) nor the spindles (C) come in
contact. In case of electronic errors, e.g., power failure,
the dry running pair of gearwheels carries out
synchronization and thus coming into contact of
spindles is ruled out and the pump comes to a standstill
in a controlled manner. A separate motor and an angle
sensor system (H) are provided for `every shaft. Motors
being an integral component of the pump, abrasive
shaft seals are not required and the pump is outwardly
air-tight. Lead screws (C) are rotated in reverse
directions without coming in contact with each other or
with the casing walls (D). Gas from the top inlet side (A)
is compressed to the lower discharge side (J). The
SIHIdry system can compress the gas from the fine
vacuum range to the atmospheric pressure. Sealing
between spindles (C) and between the casing (D) takes
place through a narrow gap so that no fluid is required
for sealing or lubricating. Compressed gas in the
discharge compartment (B) does not come in contact
with the lubricant; fed gas is dry. Even the driving
compartment (G)
synchronization and motors (F) is free from oil as
conventional mechanical and oil-lubricated gearwheels
are not required here. The driving compartment (G) has
been secured with the help of a small gap for the
discharge side (J). Although dry running gearwheels
(I) are meshed, they do not come in contact with each
other due to electronic synchronization during
operations. They are only used for a small period of
time in case of errors.
24
Flowserve US Inc.
Rev 1
with bearing (E), emergency