Air-cooled shaft seal

motor. The shaft is supported

Patents

housing,

of the housing

Air-cooled shaft seal

in accordance

operationally

significant

polymer

exists between

the bore of

system

wall and the shaft, even in the case

amounr

of heat in

of

therefore

the housing

at the

shaft

interface.

Date: 24 July 2001

pump

znventor: G. Woodcock

presents

Sharon, MA, USA

on

method

for sealing

containing

a rotating

a fluid,

is an apparatus

in a fluid-conveying

pump.

relates to an apparatus

and method

In particular,

seal (that uses the fluid conveyed improve

the performance

Various

types

transportation a desired Many

amount of

operation,

piston,

pumps

energy-transfer

impeller

a to

in fluid-

and maintain in the fluid.

require,

for

their

shaft to drive a

device

such

as a

located away from the pump housing.

This means

disposed

axially

extend

radially

pump and

invention,

surfaces.

on

with

of the

seal

an air-cooled

annular One

on

surfaces

an

is provided cooling

an

body

or more

the

inner

helical surface.

surface,

and

away from the longitudinal

axis

a bore in the

of the

annular

linkage to the

present

a substantially

body.

The

a substantial

dissipation,

and

a relatively

static

in the helical

channel

the need for an annular

active heat-transfer

is and

cavity or

equipment.

Bearing-assembly material reduces air leakage in gas turbines Title: Variable vane seal and washer materials Patent number: US 6264369

outer

external

increased

Inventors: T.C. Mesing, W.R. Bowen, D.B. Hester Assignee: General Electric Co, Cincinnati, OH, USA

with

such as radial fins are

the

as the

Date: 24 July 2001

the

apparatus

for example,

through,

a of

costs.

wall, for direct (or indirect)

the housing housing

outside

components,

passive

such

reduced

related

is formed external

Such

variety

economic

comprises

and outer

Multiple

extends

for

a

including

with

sealing

be

out of the pump,

1). In one embodiment,

shaft-seal

by a motor

that part of the shaft necessarily

and

permits

seal, or plug,

external,

and

may

reduced

maintenance

improved

point

to

here energy

forming

itself, without

material

is being processed,

gradient

housing

the pump.

conditions,

accordance

to the shaft is generated

transmitted

power

into

contribute

life

a structure

leakage

by fluid leaking

efficiency,

increased

the

clearance

viscous

from

in the seal to

Depending

of the pump

the

may

channels

rotational

this

pressure

undesirable

inner

or gear. the

frictionless

of

leakage

(torque)

Typically,

atmosphere

direction

or by air infiltrating

(Figure

pump/

that over the range of

point.

atmosphere,

In

effective

pressures,

the interior

pump

is employed

leakage

the

service

are used

to develop

at least one rotatable

mechanical

for cooling by a pump)

of flow energy

these

it

of the seal.

of pumps

systems

used

or

where

described

is transferred

contained

melt or adhesive

element

a potential

characterized

shaft in a housing

such as the drive-shaft

housing

operating

the

and

or similar

It is recognized

between of this invention

heat energy

material

In systems

magnitude

shaft seal

which

the atmosphere.

clearance

Patent number: US 6264447

The subject

with

through

the polymer

the pump

where a bushing

Assignee: Dynisco,

in the

operation. A

Tide: Air-cooled

or mounted

but must be free to rotate at the interface

surfaces

surface

area

Details

are given of a seal and washer

assembly)

for

particular

a gas

Gas turbine

engines

compressor,

pressure

turbine.

engine

generally

Compressed fuel

and

in

materials. include

a ‘combustor’

while

(bearing

engine,

the bearing-assembly

pressure

the

turbine

a high-

and a high-

air flows through

is

mixed

with

the

compressed

air and ignited to form a high-energy

gas stream

in the compressor

and

combustor,

respectively. 80

80

The

compressor

surrounded

typically

such that it is removable, two

parts

that

compressor which

vanes, The

joined

vanes. The casing

stator-vane rows,

downstream Variable control

to

is bolted

onto

optimize

towards

a

are used

its

to

through

the

performance.

A

includes

a variable

seal and a washer. The assembly a stator

casing

and the trunnion

an opening

that extends

the casing. The vane includes a vane stem

that extends

through

the trunnion

The bearing-assembly

Sealing Technology No. 94

flow

assemblies

and through surface

blades.

the rotor-

of air flowing

seal and washer surround through

air

variable vane-assembly

vane, a trunnion

the stator

the rotor

row.

stator-vane

compressor known

direct

the amount

stages, each of

are between

rotor-blade

in The

blades and a row

supports

supports

rows and

together.

multiple

a row of rotor

and the rotor

blade

a rotor

and is often formed

are

also includes

includes

of stator

includes

by a casing. The casing is fabricated

that

prevents

the opening

in the casing

seal and washer. produces

a low-friction

metal-on-metal

contact.

V