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B. The LPC rotor consists of a titanium hub (1st-stage) mechanically attached to a four stage (1.6th-, 2nd-, 3rd, and 4th-stage) titanium drum rotor. Titanium blades are installed in all five stages of the LPC rotor. The 1st-stage of the rotor (fan stage) consists of 38 wide chord blades which are installed in slots 12 degrees from axial in the front LPC hub. The fan blades are retained at the rear by the drum rotor and at the front by a circumferential blade lock installed in aligned slots in the hub. Each fan blade has a single aft positioned part span shroud for added strength. Fan blades are replaceable individually or in balanced pairs. The blades in the remaining four stages of the LPC rotor are installed in axial slots in the drum rotor and are retained by wire blade locks. Four pairs of knife-edge seals are integral to the drum rotor and are in axial alignment with each of the 1st-, 1.6th-, 2nd-, and 3rd-stage stator inner shrouds. The LPC rotor is driven by the low pressure turbine (LPT). The front LPC hub is splined to a titanium turbine shaft coupling which in turn is splined to the LPT shaft. Structural support for the rotor is provided by the No. 1 ball bearing which is mounted on the front LPC hub.
C. The LPC stator consists of a single stage (1st-stage stator) full loop aluminum case with titanium stator vanes mechanically attached to a three stage (1.6th-, 2nd, and 3rd-stage stator) split case aluminum stator assembly with titanium vanes installed in all three stages. The 1st-stage stator consists of 88 solid vanes and is located immediately aft of the 1st-stage (fan) blades at the entrance to the primary gaspath. At the inner shroud of the 1st-stage stator are a pair of PWA 407 abradable seal lands axially aligned with a pair of knife-edge seals on the drum rotor. The 1.6th-, 2nd-, and 3rd-stage stator assembly also contains solid vanes and incorporates three PWA 407 abradable rubstrips at outer shroud locations in axial alignment with the 1.6th-, 2nd-, and 3rd-stage blades. At inner shroud locations are three pairs of PWA 407 abradable seal lands in axial alignment with pairs of knife-edge seals on the drum rotor. An aluminum LPC stage duct, which incorporates a PWA 407 abradable rubstrip in axial alignment with the 4th-stage LPC blades, is mechanically attached to the rear outer flange of the LPC stator.
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
LPC (1.6TH-, 2ND-, SEE A
AND 3RD-STAGE) STATOR
INLET
CONE
LPC ROTOR SEE B
23
1.6 4 SEE C
NO. 1 BALL BEARING
FRONT LPC HUB 4
1.6
23 1ST-STAGE STATOR
FAN EXIT FAIRING (FAN) BLADE 1ST-STAGE
SEE D SEE E
A L-A0698
Low Pressure Compressor (LPC)
Figure 1 (Sheet 1)
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1.6TH-, 2ND-, 3RD-, AND 4TH-STAGE BLADES
INLET CONE
REAR SEGMENT
INLET CONE FRONT SEGMENT
INLET CONE
B
LPC ROTOR C
1ST-STAGE (FAN) BLADE
FAN EXIT FAIRING
DE
L-A0703
Low Pressure Compressor (LPC) Figure 1 (Sheet 2)
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
D. The inlet cone consists of an inlet cone front segment which is bolted to an inlet cone (rear) segment which, in turn, is bolted to the forward flange of the front LPC hub. The inlet cone segments provide a smooth aerodynamic fairing at the inlet of the LPC. Both inlet cone segments are fabricated from Kevlar fabric impregnated with epoxy resin.
E. The fan exit fairing, which is constructed of Kevlar coated with polyurethane, surrounds the forward half of the LPC stator and acts as an aerodynamic splitter separating the primary (main gas generator) airstream from the secondary (fan discharge) airstream.
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本文鏈接地址：747-400 AMM 飛機維護手冊 發動機 ENGINE 1(108)
