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US 5,975,845 AGranted
Turbomachinery abradable seal
AssigneeHolset Engineering Company Limited
InventorKenneth Ball
Life of this patent
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AssigneeHolset Engineering Company Limited
InventorKenneth Ball
Estimating the term…
A centripetal turbine (1) comprises a housing (3) and a turbine wheel (4) mounted within the housing (3) and having turbine blades (5). The housing (3) defines an annular inlet passageway (7) arranged around a portion of the turbine wheel (4), and an outlet passageway (8) which has a generally cylindrical portion arranged around a portion of the turbine wheel (4). The housing (3) also defines a curved annular shoulder (9) curving radially outwards from the generally cylindrical portion of the outlet passageway (8) to the annular inlet passageway (7). The radially outer edge of each turbine blade (5) has a first portion (11) adjacent the generally cylindrical portion of the outlet passageway (8), and a second curved portion (12) adjacent the curved annular shoulder (9). The housing (3) is provided with an annular layer (13) of an abradable material covering substantially all of the substantially cylindrical portion of the outlet passageway (8) but at most only a relatively small annular portion of the curved shoulder (9) adjacent the cylindrical portion of the outlet passageway (8).
A centripetal turbine comprising a housing, a turbine wheel mounted within the housing and having turbine blades each having a radially outer edge, the housing defining an annular inlet passageway arranged around a portion of the turbine wheel, an outlet passageway which has a generally cylindrical passageway arranged around a portion of the turbine wheel, and a curved annular shoulder curving radially outwards from said generally cylindrical portion of the outlet passageway to said annular inlet passageway, the radially outer edge of each blade having a first portion adjacent the generally cylindrical portion of the outlet passageway, and a second curved portion adjacent the curved annular shoulder, wherein the housing is provided with an annular layer of an abradable material covering substantially all of said substantially cylindrical portion of the outlet passageway and at most only a relatively small annular portion of the curved shoulder adjacent said cylindrical portion of the outlet passageway.
A centrifugal compressor comprising a housing, a compressor wheel mounted within the housing and having compressor blades, the housing being provided with an annular layer of an abradable material in a region adjacent said compressor blades, wherein the housing defines an inlet passageway which has a generally cylindrical portion arranged around a portion of the compressor wheel, an annular outlet passageway arranged around a portion of the compressor wheel, and a curved annular shoulder curving radially outwards from said generally cylindrical portion of the inlet passageway to said annular outlet passageway, the radially outer edge of each blade having a first portion adjacent the generally cylindrical portion of the inlet passageway, and a second curved portion adjacent the curved annular shoulder, wherein the annular layer of abradable material covers at least part of said curved shoulder but all, or substantially all, of said cylindrical portion of the inlet passageway is left uncovered by said layer of abradable material.
A turbine comprising a housing, a turbine wheel mounted within the housing and having turbine blades, the housing being provided with an annular layer of an abradable material in a region adjacent said turbine blades, wherein said abradable material comprises about 93% by weight of nickel powder, about 5% aluminum powder by weight, and a binder.
Dependencies are inferred from the claim text.