Operation of a Positive Displacement Pump
Figure 008
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(a) One filter (15 microns)
(b) One clogging indicator transmitter (oil filter differential pressure switch) subjected to the upstream and downstream pressures of the supply filter.
(c) One bypass valve which opens if the supply filter clogs.
(d) One 44-micron back-up filter operating if the supply filter clogs.
(e) One capped provision for a pressure gage upstream of the filter.
(f) An oil temperature sensor.
(4) Engine lubrication Downstream of supply filter, the oil flows through the three lubrication unit outlets to the forward sump, aft sump and the AGB where it is bypassed externally to the transfer gearbox (TGB). The following oil quantities flow at take off :
- Total = 2495 l.h (659 USgal.h)
- Forward engine sump = 1195 l.h (315.68 USgal.h)
- Aft engine sump = 475 l.h (125.48 Usgal.h)
- AGB = 535 l.h (141.33 USgal.h)
- TGB = 260 l.h (68.68 USgal.h)
- Anti siphon = 30 l.h (7.92 USgal.h).
(5) Anti siphon System The supply line from the oil tank to the pump supply has an antisiphon device to prevent the drainage of the tank into the gearboxes and sumps when the engine is shut down for extended periods.
(6) Oil supply circuit indication (Ref. 79-31-00)
(a) Oil filter differential pressure
(Ref. Fig. 002, 003, 004)
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(b) Oil temperature (Ref. Fig. 001)
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C. Internal Lubrication of Lubrication Unit The internal lubrication of the lubrication unit is provided by oil bled from the supply pump discharge circuit via a passage machined in the housing. This oil enters the central conduit of the drive shaft. From there, it flows radially through holes in the shaft to lubricate the split bushing and then flows on toward the other end of shaft to lubricate the shaft external splines via 2 calibrated orifices.
4. Scavenge
________
A. General (Ref. Fig. 003, 004, 006, 008) The oil which has lubricated the engine bearings, accessory gearbox and TGB is scavenged by 4 pumps, each protected upstream by a coarse filtration screen (1000 microns). This oil is then collected in a single line/circuit comprising, downstream and in this order:
- a master magnetic chip detector connected to the master chip detector indicator.
- the servo-fuel heater
- the main oil/fuel heat exchanger After having circulated through those elements, the oil is sent back into the tank. The oil passes through a deareator which separates the oil and the air. The air is then sent to the vent system.
B. Description
(Ref. Fig. 004, 006, 008, 009, 010, 011, 012)
The scavenge circuit main flow-through components are a follows :
- Four scavenge plugs, each with an integral screen (1000 microns) and a provision for installation of an optional magnetic rod in the plug assembly.
- Four scavenge pumps
(Ref. Fig. 004)
- One master magnetic chip detector(MCD) connected to the master chip detector indicator (Ref. Fig. 011, 012)
- One servo-fuel heater
(Ref. Fig. 009, 010)
- One main oil/fuel heat exchanger
(Ref. Fig. 009, 010)
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Main Oil/Fuel Heat Exchanger - Oil Circulation
Figure 009
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Main Oil/Fuel Heat Exchanger - Fuel Circulation
Figure 010
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Master Magnetic Chip Detector (MCD)
Figure 011
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E E Feb 01/98 E E ECES E F 『 E C F M E E E E 56-5B E E 56-5B E E E (1) Screening upstream of the 4 scavenge pumps (Ref. Fig. 006) The air/oil mixtures returning from the AGB, forward sump, TGB and aft sump, first flow through the scavenge screens, and then to the specific scavenge pump. The forward sump scavenge pump also receives the flow internally bypassed from the supply pump through the relief valve.
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