De-aerator seal of oil system

An oil supply system for supplying oil to a lubricating cavity of a gas turbine engine, comprising:

• one or more pumps configured to urge oil toward the lubricating cavity;
• and
• a de-aerator hydraulically connected to the lubricating cavity via a scavenge line, the de-aerator including:
• a de-aerator housing, including:
• a fluid inlet through which a mixture of oil and air enters the de-aerator housing from the scavenge line;
• an air-oil outlet through which mixture of oil and air of lower oil concentration than the inlet mixture exits the de-aerator housing;
• and
• an oil outlet through which a flow of oil exits the de-aerator housing;
• an impeller disposed in the de-aerator housing and driven about an impeller axis to separate oil from the mixture of air and oil and direct the oil toward the oil outlet;
• and
• a seal disposed in the de-aerator housing downstream of the impeller, the seal including:
• a plurality of seal fins extending radially outwardly from an impeller hub of the impeller toward an inner housing surface of the de-aerator housing;
• wherein the plurality of seal fins define a labyrinth seal with the inner housing surface to minimize an oil outlet oil flow from exiting the de-aerator housing via the air-oil outlet;
• further comprising a finned sleeve including:
• a sleeve body;
• and
• the plurality of seal fins extending radially outwardly from the sleeve body;
• wherein the finned sleeve is installed to an outer hub surface of the impeller hub.

A gas turbine engine system, comprising:

• a gas turbine engine;
• and
• an oil supply system configured to supply oil to a lubricating cavity of the gas turbine engine;
• wherein the oil supply system includes a de-aerator, including:
• a de-aerator housing, including:
• a fluid inlet through which a mixture of oil and air enters the de-aerator housing from the scavenge line;
• an air-oil outlet through which mixture of oil and air of lower oil concentration than the inlet mixture exits the de-aerator housing;
• and
• an oil outlet through which a flow of oil exits the de-aerator housing;
• an impeller disposed in the de-aerator housing and driven about an impeller axis to separate oil from the mixture of air and oil and direct the oil toward the oil outlet;
• and
• a seal disposed in the de-aerator housing downstream of the impeller, the seal including:
• a plurality of seal fins extending radially outwardly from an impeller hub of the impeller toward an inner housing surface of the de-aerator housing;
• wherein the plurality of seal fins define a labyrinth seal with the inner housing surface to minimize an oil outlet oil flow from exiting the de-aerator housing via the air-oil outlet;
• further comprising a finned sleeve including:
• a sleeve body;
• and
• the plurality of seal fins extending radially outwardly from the sleeve body;
• wherein the finned sleeve is installed to the impeller hub;
• and
• further comprising one or more clocking features to circumferentially locate and retain the finned sleeve relative to the impeller hub.