Abstract:
A modular egress seal assembly includes an annular plate with an axially extending aperture. A base plate is mountable to the annular plate. The base plate includes an aperture extending along the axis when said base plate is mounted to the annular plate thereby forming an axial passageway and a cover plate mountable to said annular plate.

Description:
[0001]    This application claims priority to U.S. Patent Appln. No. 61/768,961 filed Feb. 25, 2013. 
     
    
     BACKGROUND 
       [0002]    The present disclosure relates to a gas turbine engine and, more particularly, to an instrumentation egress seal therefor. 
         [0003]    Gas turbine engines are typically instrumented when under development. An instrumentation probe, for example temperatures and pressures, is connected through a lead that provides a close mechanical fit with the engine case structure. When such an instrumentation probe is utilized in conjunction with a hostile environment such as in a combustor section, turbine section or augmentor section, a potting compound often provides the seal. 
         [0004]    Specific mechanical instrumentation egress assemblies are also provided for particular instrumentation installations. Instrumentation, however, may change over the development cycle which necessarily requires a change to the mechanical instrumentation egress assembly. This may result in increased cost and extended development time. 
       SUMMARY 
       [0005]    A modular egress seal assembly according to one disclosed non-limiting embodiment of the present disclosure includes an annular plate with an axially extending aperture. A base plate is mountable to the annular plate, the base plate including an aperture extending along the axis when the base plate is mounted to the annular plate, thereby forming an axial passageway and a cover plate mountable to the annular plate. 
         [0006]    A further embodiment of the present disclosure includes, wherein the annular plate includes a multiple of through-through-slots on a top surface thereof. 
         [0007]    A further embodiment of any of the foregoing embodiments of the present disclosure includes, wherein the annular plate includes at least one fitting aperture transverse to the axis and extending to the axially extending aperture. 
         [0008]    A gas turbine engine according to another disclosed non-limiting embodiment of the present disclosure includes a duct with an instrumentation port along an axis and a modular egress seal assembly mounted to the instrumentation port along the axis. 
         [0009]    A further embodiment of any of the foregoing embodiments of the present disclosure includes, wherein the modular egress seal assembly includes a multiple of stacked annular plates. 
         [0010]    A further embodiment of any of the foregoing embodiments of the present disclosure includes, wherein at least one of the multiple of stacked annular plates includes a multiple of instrumentation lead through-slots on a top surface thereof 
         [0011]    A further embodiment of any of the foregoing embodiments of the present disclosure includes, wherein at least one of the multiple of stacked annular plates includes at least one fitting aperture transverse to the axis and extending to the axially extending aperture. 
         [0012]    A further embodiment of any of the foregoing embodiments of the present disclosure includes, wherein the at least one fitting aperture is located within a block. 
         [0013]    A further embodiment of any of the foregoing embodiments of the present disclosure includes, wherein the at least one fitting aperture includes two (2) fitting apertures within a block. 
         [0014]    A further embodiment of any of the foregoing embodiments of the present disclosure includes, wherein the at least one fitting aperture is air-cooled. 
         [0015]    A method of installing a modular egress seal assembly to an instrumentation port in a gas turbine engine according to another disclosed non-limiting embodiment of the present disclosure includes mounting at least one of one or more annular plates, having an axially extending aperture therein to a base plate that surrounds an instrumentation port; and topping the at least one of one or more annular plates with a cover plate, thereby providing an axial passage into the instrumentation port. 
         [0016]    A further embodiment of any of the foregoing embodiments of the present disclosure includes mounting at least one of a multiple of annular plates to the base plate with a multiple of fasteners which extend therethrough. 
         [0017]    A further embodiment of any of the foregoing embodiments of the present disclosure includes threading an instrumentation lead through one of one or more instrumentation lead through-slots located in a top surface and extending to the aperture of the at least one of the one or more annular plates. 
         [0018]    A further embodiment of any of the foregoing embodiments of the present disclosure includes sealing the instrumentation lead in the instrumentation lead slot with a potting compound. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0019]    Various features will become apparent to those skilled in the art from the following detailed description of the disclosed non-limiting embodiment. The drawings that accompany the detailed description can be briefly described as follows: 
           [0020]      FIG. 1  is a general schematic view of an exemplary gas turbine engine; 
           [0021]      FIG. 2  is an expanded perspective view of a duct of the gas turbine engine with a modular egress seal assembly; 
           [0022]      FIG. 3  is an expanded view of the modular egress seal assembly according to one disclosed non-limiting embodiment; 
           [0023]      FIG. 4  is an exploded view of the modular egress seal assembly; 
           [0024]      FIG. 5  is an expanded perspective view of an egress seal annular plate of the modular egress seal assembly; 
           [0025]      FIG. 6  is an expanded perspective view of an egress seal fitting assembly of the modular egress seal assembly; 
           [0026]      FIG. 7  is an expanded perspective view of an instrumentation annular plate of the modular egress seal assembly; 
           [0027]      FIG. 8  is an expanded perspective view of the modular egress seal assembly assembled according to one arrangement; 
           [0028]      FIG. 9  is an expanded perspective view of the modular egress seal assembly assembled according to another arrangement; 
           [0029]      FIG. 10  is an expanded perspective view of the modular egress seal assembly assembled according to another arrangement; and 
           [0030]      FIG. 11  is an expanded perspective view of the modular egress seal assembly assembled according to another arrangement. 
       
    
    
     DETAILED DESCRIPTION 
       [0031]      FIG. 1  schematically illustrates a gas turbine engine  20 . The gas turbine engine  20  is disclosed herein as a two-spool low-bypass augmented turbofan that generally incorporates a fan section  22 , a compressor section  24 , a combustor section  26 , a turbine section  28 , an augmenter (afterburner) section  30 , an exhaust duct section  32 , and a nozzle system  34  along a central longitudinal engine axis A. Although depicted as an augmented low bypass turbofan in the disclosed non-limiting embodiment, it should be understood that the concepts described herein are applicable to other gas turbine engines including non-augmented engines, geared architecture engines, direct drive turbofans, turbojet, turboshaft, multi-stream variable cycle and other engine architectures. 
         [0032]    An outer structure  36  and an inner structure  38  define a generally annular secondary airflow path  40  around a core primary airflow path  42 . Various structure and modules may define the outer structure  36  and the inner structure  38  which essentially define an exoskeleton to support the rotational hardware therein. 
         [0033]    With reference to  FIG. 2 , a modular egress seal assembly  50  operates to seal a multiple of instrumentation leads L from, for example only, a duct  44  such as a forward augmentor duct of the augmenter section  30  ( FIG. 1 ). The modular egress seal assembly  50  provides for selective sealed egress of a multiple of instrumentation leads L from thermocouples or other sensors through an instrumentation port  46 . The modular egress seal assembly  50  in one disclosed non-limiting embodiment provides a variable instrumentation count such as, for example, 12-60 leads L and two (2) pressure transducers K such as those manufactured by Kulite Semiconductor Products, Inc. of New Jersey USA. 
         [0034]    With reference to  FIG. 3 , the pressure transducers K also communicate through lead wires L which may or may not be located within an armored conduit T through which cooling air may be communicated. It should be appreciated that many different types and numbers of instrumentation leads, wires, air-cooled conduits, non air-cooled conduits and other communication paths may be alternatively or additionally accommodated. 
         [0035]    With reference to  FIG. 4 , the modular egress seal assembly  50  generally includes a base plate  54 , an egress seal annular plate  56 , an egress seal fitting assembly  58 , an instrumentation annular plate  60 , a cover plate  62  and a multiple of fasteners  64 . It should be appreciated that many different types of plates may alternatively or additionally provided. 
         [0036]    The base plate  54  receives one or more of the annular plates  56 ,  60  upon which is stacked the cover plate  62  and retained by the fasteners  64 . The base plate  54 , the egress seal annular plate  56  and the instrumentation annular plate  60  generally includes a respective aperture  66 ,  68 ,  70  defined about an egress seal axis W. The apertures  66 ,  68 ,  70  provide a passage for the instrumentation leads L from the instrumentation port  46  ( FIG. 3 ). 
         [0037]    With reference to  FIG. 5 , the egress seal annular plate  56  includes a multiple—two shown—of fitting apertures  72 A,  72 B, transverse to the axis W and in communication with the aperture  68 . The fitting apertures  72 A,  72 B are located within a block  74  onto which the egress seal fitting assembly  58  may be fastened to receive, for example, pressure transducers (not shown) and air cooling conduits  74 A,  74 B ( FIG. 6 ). The egress seal annular plate  56  also includes an instrumentation lead through-slot array  75  with a multiple of instrumentation lead through-slots  75 A,  75 B . . .  75   n,  along a top surface  78  thereof in communication with the aperture  68 . In one disclosed non-limiting embodiment, twelve (12) instrumentation lead through-slots  75  are provided, however, any number will benefit herefrom. Each of the multiple of instrumentation lead through-slots  75 A- 75   n  is capable of routing, for example, a thermocouple lead that may be sealed therein by a high-temp, e.g., about 1800 F (538 C) capability potting material. It should be appreciated that unused instrumentation lead through-slots  75  may be completely filled and closed off with potting compound or other seal. 
         [0038]    With reference to  FIG. 7 , the instrumentation annular plate  60  includes an instrumentation lead through-slot array  77  with a multiple of instrumentation lead through-slots  77 A,  77 B . . .  77   n  along a top surface  80  thereof in communication with the aperture  68 . In one disclosed non-limiting embodiment, a forty-eight (48) instrumentation lead through-slots array  77  is provided around the top surface  80  provided, however, any number will benefit herefrom. 
         [0039]    Assembly of the egress seal annular plate  56 , the instrumentation annular plate  60  and the cover plate  62  to the base plate  54  provides for egress of, for example, sixty (60) total instrumentation lead through-slots  75 ,  77  and two (2) fitting apertures  72 A,  72 B ( FIG. 8 ). Alternately, assembly of the egress seal annular plate  56 , and the cover plate  62  to the base plate  54  provides for egress of twelve (12) instrumentation lead through-slots  75  and two (2) fitting apertures  72 A,  72 B ( FIG. 8 ). Alternately, assembly of the instrumentation annular plate  60  and the cover plate  62  to the base plate  54  provides for egress of forty-eight (48) instrumentation lead through-slots  75  ( FIG. 10 ). Alternately, assembly of the cover plate  62  to the base plate  54  seals the forward augmentor duct  52  ( FIG. 11 ). This list of alternatives is not exclusive. It should be appreciated that although only one of each plate is disclosed in the various alternative examples, any number of plates may be combined to provide a desired instrumentation egress combination. 
         [0040]    The modular egress seal assembly  50  facilitates the egress of significant numbers of instrumentation leads L through a relatively small instrumentation port which, in the disclosed non-limiting embodiment may be of only 2 inches (50 mm) diameter. Furthermore, the modularity facilitates development as the instrumentation needs may change and the port may eventfully be sealed with the cover plate  62  when instrumentation is no longer required. 
         [0041]    It should be understood that like reference numerals identify corresponding or similar elements throughout the several drawings. It should also be understood that although a particular component arrangement is disclosed in the illustrated embodiment, other arrangements will benefit herefrom. 
         [0042]    Although the different non-limiting embodiments have specific illustrated components, the embodiments of this invention are not limited to those particular combinations. It is possible to use some of the components or features from any of the non-limiting embodiments in combination with features or components from any of the other non-limiting embodiments. 
         [0043]    Although particular step sequences are shown, described, and claimed, it should be understood that steps may be performed in any order, separated or combined unless otherwise indicated and will still benefit from the present disclosure. 
         [0044]    The foregoing description is exemplary rather than defined by the limitations within. Various non-limiting embodiments are disclosed herein, however, one of ordinary skill in the art would recognize that various modifications and variations in light of the above teachings will fall within the scope of the appended claims. It is therefore to be understood that within the scope of the appended claims, the disclosure may be practiced other than as specifically described. For that reason the appended claims should be studied to determine true scope and content.