Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B64—AIRCRAFT; AVIATION; COSMONAUTICS
  • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
  • B64D29/00—Power-plant nacelles, fairings, or cowlings
  • B64D29/06—Attaching of nacelles, fairings or cowlings
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B64—AIRCRAFT; AVIATION; COSMONAUTICS
  • B64C—AEROPLANES; HELICOPTERS
  • B64C1/00—Fuselages; Constructional features common to fuselages, wings, stabilising surfaces or the like
  • B64C1/40—Sound or heat insulation, e.g. using insulation blankets
  • B64C1/403—Arrangement of fasteners specially adapted therefor, e.g. of clips
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
  • F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
  • F16B5/06—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of clamps or clips
  • F16B5/0607—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of clamps or clips joining sheets or plates to each other
  • F16B5/0621—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of clamps or clips joining sheets or plates to each other in parallel relationship
  • F16B5/0642—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of clamps or clips joining sheets or plates to each other in parallel relationship the plates being arranged one on top of the other and in full close contact with each other

Definitions

• the present invention relates to a device for fixing a thermal protection mat on a fixed internal structure of a turbojet engine nacelle.
• An airplane is driven by one or more turbojet engines each housed in a nacelle.
• a nacelle generally has a substantially tubular structure comprising an air inlet upstream of the turbojet engine, an intermediate assembly intended to surround a fan of the turbojet engine and a rear assembly that can incorporate thrust reverser means and intended to surround the combustion chamber. and all or part of the compressor and turbine stages of the turbojet, and is generally terminated by an ejection nozzle whose output is located downstream of the turbojet engine.
• the modern nacelles are intended to house a turbofan engine capable of generating, on the one hand, a flow of hot air (also called primary flow) from the combustion chamber of the turbojet engine and circulating in a space defined by a compartment of for substantially tubular called “core" compartment, and secondly, a cold air flow (d it secondary flow) from the fan and circulating outside the turbojet through an annular passage, also called vein, formed between an internal structure defining a fairing of the turbojet and an inner wall of the nacelle.
• the two air flows are ejected from the turbojet engine from the rear of the nacelle.
• the "core” com partion comprises an outer casing serving as a casing and called internal fixed structure (IFS).
• IFS internal fixed structure
• thermal protection mats also provide fire protection and can be used in other areas of the nacelle at which there is a fire hazard.
• protective panels placed on the "core" compartment side, and comprising at least one insulation blanket, generally made from silica fibers, ceramic or a microporous material, said mat being sandwiched between strips generally of stainless steel.
• the thermal protection mattresses are fixed to the IFS by means of fastening systems which cooperate punctually with it on the entire protective surface in the manner of rivets.
• thermal protection is also retained by its edges on the IFS by retaining strips commonly called "retainers”.
• Such a fastening system uses a brake wire system and generally comprises two parts, namely, on the one hand, a base fixed in the I FS and carrying a hooked structure (of the hook type, passing or pin to grommets for example) coming partially inside a corresponding fixing aperture of the mattress and adapted to receive a brake wire, and secondly, a retaining button pressing against an outer surface of the mattress in order to form a holding and clamping washer, said retaining button being provided with openings for the passage of the brake wire which is then twisted and tightened.
• the twisted end of the brake wire is then embedded in silicone.
• the brake wire system may be replaced by a threaded or threaded hooked structure cooperating with a complementary end of the retainer button.
• screwed systems are heavy, have a higher cost and are not very thermally efficient.
• the height of the hooked structure is limited to the thickness of the mattress.
• the eyelets or hook of the hooked structure is located inside the corresponding orifice of the mattress and it is very difficult to pass the brake wire there. This requires a lot of time and precision to operators, especially since this operation must be repeated for each fixation.
• a fixing device for a thermal protection panel comprising at least one attachment base adapted to ensure its attachment to a fixed structure intended to receive said panel, said attachment base being equipped with at least one attachment structure able to penetrate to the interior of a corresponding through-hole of the panel to be fixed to cooperate with a retentive means corresponds to the complementary insulated retaining button, characterized in that the fastening structure extends over a length greater than the thickness of the thermal protection panel to be fixed so as to project from the latter, and in that the device comprises at least one intermediate spacer intended to be arranged between the thermal protection panel and the control button. retained and having a through hole within which the projecting portion of the fastening structure is able to penetrate partially to cooperate with the button retaining means.
• the spacer then serves as a support structure complementary to the button and compensates for this additional height of the attachment structure.
• the spacer also enhances the thermal performance of the brake wire system currently used.
• the button retaining means is a brake wire.
• the attachment structure of the retaining means is a hook.
• the hooking structure of the retaining means is an eyelet bolt forming a passing for the brake wire.
• the button retaining means is a threaded or threaded endpiece.
• the attachment structure is a stud threaded / threaded complementary to the threaded tip / threaded button.
• the attachment structure extends in a direction substantially normal to the mounting base and corresponding attachment plane.
• the mounting base can be integrated in the fixed structure for receiving the panel.
• the present invention relates to a device 10 for attaching a thermal protection panel 1 to a fixed structure 2.
• the device comprises at least one base 1 1 fixing adapted to ensure its attachment to the fixed structure 2, for example by gluing and equipped with a fastening structure 12 is in the form of a peak to eyelet 13 extending in a direction substantially normal to the base 1 1.
• the thermal protection panel 1 covers the base at a housing 1 of substantially complementary shape formed in the thickness of the panel 1.
• a through hole 1b located opposite the attachment structure 12 allows the latter to pass through the panel 1.
• An insulating washer 14 provides the interface between the panel 1 and the base 12.
• the attachment structure 12 has a length sufficient to pass through the orifice 1b and project from the panel 1 so as to make the eyelet 13 accessible.
• the attachment structure is intended to cooperate with a corresponding retaining means, in this case a brake wire 1 5, associated with a retaining button 16.
• the device comprises an intermediate spacer 17 intended to be positioned between the thermal protection panel 1 and the retaining button 16 and is in the form of a washer having a central rifle 1 7a a pte to allow the introduction of the fastening structure 12.
• the brake wire is introduced through the eye let 1 3 of the attachment structure 1 2 and its ends are introduced through two corresponding orifices (not visible) of the retaining button 16. The brake wire is then twisted so as to ensure the tightening and the support of the retaining button 16.
• the spacer 17 has a thickness greater than the height of the part of the attachment structure 12 projecting from the panel 1 so that this attachment structure penetrates only partially to the inside of the orifice 17a.
• the retaining button clamps against the spacer 17 which holds the panel 1, while making the fastening structure more accessible when the device 10 is not tight.
• the brake wire is then embedded in silicone as in the prior art.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Aviation & Aerospace Engineering (AREA)
• Connection Of Plates (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (8)

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Family Cites Families (18)

• 2012
  • 2012-11-13 FR FR1260771A patent/FR2998031B1/fr not_active Expired - Fee Related
• 2013
  • 2013-11-13 CA CA2888555A patent/CA2888555C/fr not_active Expired - Fee Related
  • 2013-11-13 WO PCT/FR2013/052729 patent/WO2014076420A1/fr active Application Filing
  • 2013-11-13 EP EP13803142.2A patent/EP2920473A1/de not_active Withdrawn
  • 2013-11-13 RU RU2015122488A patent/RU2015122488A/ru not_active Application Discontinuation
  • 2013-11-13 CN CN201380059205.0A patent/CN104813039A/zh active Pending
  • 2013-11-13 BR BR112015007305A patent/BR112015007305A2/pt not_active IP Right Cessation
• 2015
  • 2015-05-05 US US14/704,285 patent/US20150232190A1/en not_active Abandoned

Non-Patent Citations (1)

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