Removable support for the sealing lining of the casing of jet engine blowers

{
  "publication_number": "US4295787A",
  "country": "US",
  "kind": "A",
  "title": "Removable support for the sealing lining of the casing of jet engine blowers",
  "abstract": "A support for a sealing lining of a jet engine blower consists of three centric ferrules: one inner ferrule carrying the sealing lining, an intermediate ferrule, an outer ferrule, and a U-shaped ferrule supporting the inner and outer ferrules. The ferrules are made of epoxy resin and glass fibers. The outer ferrule has surfaces which telescope into parts of the casing.",
  "claims": [
    "1. In a removable support for sealing linings in the blower casings of jet engines, the casing being at least partially attached to acoustic panels, the improvement comprising: at least two concentric ferrules; an inner ferrule having a part of its internal surface conforming to the flow of the air stream and the other part extending over a zone covered by blades of a rotor, said inner ferrule supporting a lining, an outer ferrule being provided on its external surface with cylindrical surfaces adapted to engage surfaces provided on the internal surface of the casing by means of force fitting, the space between the two ferrules being filled with a filler material, and at least one ferrule of U-shaped cross section, connecting the two concentric ferrules at their ends, with the integral part of the outer ferrule receiving securing means, which immobilize said support against rotation relative to the casing.",
    "2. A removable support as defined in claim 1, wherein said support comprises three concentric ferrules, an inner ferrule of small thickness, an intermediate ferrule supporting said inner ferrule on at least part of its internal surface, an outer ferrule and a U-shaped ferrule connecting the three concentric ferrules by their ends, the other ends of the inner ferrule and the intermediate ferrule being in abutment.",
    "3. A removable support as defined in claim 2, wherein said inner ferrule has, in the direction of the flow of the air stream, at least one first cylindrical part comprising a bent end and a second conical part to which a sealing lining is attached, and a third essentially cylindrical part conforming to the aerodynamical flow profile, the intermediate ferrule having, in the direction of the flow of the air stream, a first cylindrical part extending approximately over the first cylindrical part and the second conical part of the inner ferrule, a second conical part covering approximately the third cylindrical part of the inner ferrule, a third cylindrical part approximately coextensive with the third cylindrical part of the inner ferrule, the outer ferrule having, in the direction of the flow of the air stream, four cylindrical parts of decreasing diameter, at least one of the first cylindrical parts being joined with the first cylindrical part of the intermediate ferrule, and the U-shaped ferrule being secured between the third cylindrical part of the intermediate ferrule and the fourth cylindrical part of the outer ferrule, the ends of the first cylindrical parts of the outer ferrule and of the intermediate ferrule being joined together by the bent end of the inner ferrule.",
    "4. A removable support as defined in any one of claims 1 to 3, wherein the concentric ferrules are joined together over at least part of their surface by adhesive bonding.",
    "5. A removable support as defined in any one of claims 1 to 3, wherein the U-shaped ferrule comprises, on its part joined with the intermediate ferrule, means for the attachment of acoustical panels.",
    "6. A removable support as defined in claim 1 wherein at least the inner ferrule is made of a fiber reinforced synthetic resin.",
    "7. A removable support as defined in claim 1 wherein the ferrules are made of epoxy resin reinforced with glass fibers."
  ],
  "description_excerpt": "This invention is in the field of removable supports for the sealing lining of jet engine blowers, with the casing being at least partially lined with acoustic panels.\n\nCasings of the blowers of jet engines are covered, on their internal wall, with a sealing lining of resins or honeycomb structures capable of being worn down by the blades of the blower without damage to the latter. It is the function of the lining to insure the tightest possible seal between the ends of the blower blades and the casing surrounding them. It is readily understandable that the rubbing of the blades during operation, as the result of both thermal and mechanical deformation, lead to wear, to the extent that the sealing effect of the lining is reduced. It is then necessary to replace the lining, which is a more or less complex operation, depending on the support of the lining. When this support consists of the wall of the casing itself, it is necessary to completely dismantle the casing, sometimes involves the removal of the support for engine accessories, which is always a delicate operation. When the sealing lining is applied to a steel ferrule that is removable by means of bolts from the rest of the casing, radial dimensions are increased in a manner that may be unacceptable. Finally, the sealing lining may be present in the form of bolted segments, which are removable from the inside of the casing. Such an arrangement is shown in French Pat. No. 1,541,216, wherein the sealing lining used is a honeycomb material fastened to supporting plates which consist of a fiber glass reinforcement coated with a thermosetting resin.",
  "cpc": [
    "F01D 11/122",
    "Y02T 50/60"
  ],
  "ipc": [
    "F01D 11/12"
  ],
  "assignees": [
    "Societe Nationale dEtude et de Construction de Moteurs dAviation SNECMA"
  ],
  "inventors": [
    "Alain M. J. Lardellier"
  ],
  "filing_date": "1980-03-21",
  "publication_date": "1981-10-20",
  "grant_date": "1981-10-20",
  "priority_date": "1979-03-30",
  "application_number": "US-13264280-A",
  "family_id": "9223983",
  "cited_by_count": 36,
  "citations": [
    "US3314648A",
    "US3243158A"
  ]
}