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DESWIRLER WITH INTEGRAL SERVICE TUBES

IP.com Disclosure Number: IPCOM000250184D
Publication Date: 2017-Jun-08
Document File: 9 page(s) / 951K

Publishing Venue

The IP.com Prior Art Database

Abstract

A unitary structure for a gas turbine engine compressor includes a deswirler assembly with vanes and service tubes, and may also incorporate and heat shields and a sump housing, all in one unitary component.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 44% of the total text.

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DESWIRLER WITH INTEGRAL SERVICE TUBES

ABSTRACT

[0001] A unitary structure for a gas turbine engine compressor includes a deswirler

assembly with vanes and service tubes, and may also incorporate and heat shields and a

sump housing, all in one unitary component.

BACKGROUND

[0002] This disclosure relates generally to gas turbine engines and more particularly to

compressors thereof.

[0003] Some gas turbine engines have a compressor in which the last stage is a

centrifugal stage. The centrifugal stage impeller blades discharge flow in a radial

direction. This discharge flow passes through a radial array of deswirler tubes which turn

the flow through 90° from radial to axial directions and also remove the "swirl" (i.e.

tangential velocity component) from the flow.

[0004] In conventional compressors of this type, the set of deswirler tubes is one unit

which is bolted to a stationary part of the compressor. A sump housing which surrounds a

shaft and encloses numerous bearings and seal is provided as a separate unit which is

bolted to another stationary part of the compressor.

[0005] It is necessary to provide conduits referred to as "service tubes" which

interconnect between the sump housing and the exterior of the engine. The purpose of the

service tubes is to, e.g., provide oil supply to the bearings, to drain away used oil, to

provide venting/pressurization air, and so forth. The service tubes are typically

surrounded by heat shields.

[0006] In the engine with centrifugal compressor design described above, the service

tubes must pass radially across the path of the deswirler vanes. Conventionally, the

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service tubes are downstream of the deswirler and so lie directly in the primary flowpath,

causing pressure losses. Furthermore, the installation process for the service tubes

requires installing fittings and welding the tubes leading to added labor cost, as well as

additional costs associated with having the supplementary parts necessary for fitting and

welding.

[0007] Described herein is a deswirler assembly incorporating integral service tubes and

heat shields, and optionally an integral sump housing.

BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The concept may be best understood by reference to the following description

taken in conjunction with the accompanying drawing figures, in which:

[0009] FIG. 1 is a schematic side elevational view showing a portion of a portion, along

with a sump having integral service tubes;

[0010] FIG. 2 is a schematic perspective view of a portion of the sump shown in FIG. 1;

[0011] FIG. 3 is a front elevational view of a portion of the sump shown in FIG 1;

[0012] FIG. 4 is an enlarged schematic side view of a portion of the sump shown in FIG.

1; and

[0013] FIG. 5 is a schematic plan view taken along lines 5-5 of FIG 4.

DETAILED DESCRIPTION OF THE CONCEPT

[0014] Referring to the drawings wherein identical reference numerals denote the same

elements throughout the various views, FIG. 1 depicts a portion of an...