Fluid seal for use in rotary regenerator
AssigneeNissan Motor Co., Ltd.
InventorsHideo Sato, Osamu Kobayashi
Life of this patent
Estimating the term…
Abstract
A rubbing contact fluid seal member is provided on the hot side of a rotary regenerator of a gas turbine engine to prevent high temperature exhaust gases from mixing with counterflowing combustion air, maintaining rubbing contact with a radial surface of a rotatable matrix. The seal member is formed with a heat-resistant layer of silicon carbide at a part of its surface which is in direct contact with the high temperature exhaust gas.
Claims17
A rubbing contact fluid seal for use on the hot side in the rotary regenerator portion of a gas turbine engine, which portion includes a rotatable annular matrix, said seal comprising:
- a seal member made of carbon base material, said seal member having first and second surfaces, said first surface being contactable with the rotatable radial face on the hot side of said rotatable annular matrix, said second surface being directly contactable with hot exhaust gases before they pass through the matrix and with hot intake air after it passes through the matrix;
- and
- a heat-resistant layer formed on said second surface, allowing the major part of said first surface of carbon base material to be exposed as it is for rubbing contact with the hot side radial face of the rotatable annular matrix.
A rubbing contact fluid seal for use on the hot side in the rotary generator portion of a gas turbine engine, which portion includes a rotatable annular matrix, said seal comprising:
- a seal member comprising a carbon base material and formed with first and second surfaces, said first surface being contactable with the rotatable radial face on the hot side of said rotatable annular matrix, said second surface being directly contactable with hot exhaust gases before they pass through the matrix and hot intake air after it passes the matrix;
- and
- a heat-resistant layer formed on said second surface, allowing the major part of said first surface of carbon base material to be exposed as it is for rubbing contact with the hot side radial face of the rotatable annular matrix, said heat-resistant layer comprising a material selected from the group consisting of silicon carbide and a mixture of nickel oxide and calcium fluoride.
A rubbing contact fluid seal for use on the hot side in the rotary regenerator portion of a gas turbine engine, which portion includes a rotatable annular matrix, said seal comprising:
- a seal member comprising a carbon base material and formed with an annular portion having inner and outer cylindrical side surfaces which are concentrically arranged with each other, the inner cylindrical side surface being directly contactable with hot exhaust gases before they pass through the matrix and hot intake air after it passes through the matrix, and top and bottom annular flat surfaces which are parallel with each other, said top flat annular surface being directly contactable with the hot side rotatable radial face of the matrix and the bottom flat annular surface being secured to a stationary holder;
- and
- a heat-resistant layer formed on the inner cylindrical side surface of the annular portion of said seal member, allowing the major part of said top flat annular surface of carbon base material to be exposed as it is for rubbing contact with the hot side radial face of the rotatable annular matrix, said heat-resistant layer comprising a material selected from the group consisting of silicon carbide and a mixture of nickel oxide and calcium fluoride.
Dependencies are inferred from the claim text.