Abstract: A seal structure between first and second relatively moveable members for preventing gas flow in the space between the members and transverse to their general direction of motion is disclosed. The seal structure includes a plurality of substantially parallel strips within 30.degree. of normal to the radial plane generally containing these first and second relatively moveable members. The strips are thin and closely spaced and arranged so that one strip edge is attached to the first member and another edge is free to resiliently deflect when in rubbing contact with the second member.

Abstract: In a compressor section of a gas turbine engine, a double wall casing is provided wherein a nonstructural inner wall is removably attached to a thin, structural outer casing. The inner wall isolates the thin stator outer casing during transient turbine operations of throttle burst and throttle chop. During throttle burst and chop, the nonstructural inner wall delays rapid heating and cooling of the relatively thin-walled outer casing, and reduces radial misalignment between the stator casing and rotor due to uneven thermal expansion and contraction. The nonstructural inner wall evens-out thermal expansion and contraction of the stator casing with respect to the rotor. To fine tune the actual clearances between stator and rotor and prevent the casing outer wall from overheating, thermal insulation material is used between the nonstructural inner wall and outer casing.

Abstract: A pump, for example, a centrifugal slurry pump, has a casing (10) with an inlet (12) and an outlet (14). The casing (10) and a separate backliner (28) define a chamber (16) in which an impeller (18) is arranged to be rotated by way of a drive shaft (20) which extends axially with respect to the casing (10). Fine running clearances are defined between the front and rear surfaces of the impeller (18) and the adjacent surfaces of the casing (10) and the backliner (28). In order to compensate for increases of the running clearances, for example, due to erosion, the backliner (28) may be moved axially relative to the casing (10). The backliner (28) is connected to an annular flange (38) which is bolted to an annular flange (36) connected to the casing (10) and the spacing between the flanges (36, 38) may be adjusted by removing one or more shims (40) provided therebetween.

Abstract: A structure useable as a spacer. In a preferred embodiment, the spacer is eally suited (as one of a plurality of identical spacers) for use as a spacer between every two adjacent stator vanes of a stator vane ring of a multiple-stage fan of a gas turbofan engine. The spacer is in the form of a rectangular solid and comprises a metal face skin member having a curved aerodynamically configurated outer surface with a centrally-located longitudinally-positioned concavity which functions as a rib, and a backing pad member that is made of a molded polyethelene material with integral peripheral edge lip seals that are coated with a polyurethane material, and that is joined by its outer surface to the inner surface of the face skin member, with the backing pad member having an embedded rib skin stiffener positioned under, along, and in contact with the concavity in the face skin member.

Abstract: A trash pump having a mixed flow impeller has a housing with a rear wall through which the impeller shaft extends. A large front opening in the housing is sealingly closed by a readily detachable cover member wherein there is a port through which water enters the housing. Attached to the rear of the cover member is a volute that is received in the housing through said front opening therein and whereby water centrifuged from the impeller is guided in spiral flow to a side outlet in the housing. The rear portion of the volute, wherein there is an opening through which the impeller can pass, is adjacent to the rear wall of the housing all around the shaft. A front wall of the volute has an inlet opening in register with said port and has a rearwardly opening recess concentrically surrounding said inlet opening. An annular liner of tough elastomeric material, received in said recess, has a conical rearwardly divergent rear surface slightly spaced from front edge portions of the impeller vanes.

Abstract: A chopper pump for pumping and chopping a slurry which contains fibrous material. The pump includes a housing having a bottom inlet and a tangential outlet. A single vane impeller is mounted for rotation within the housing and a generally square cutter blade is mounted on the vane and rotates in proximity with fixed cutter teeth on the housing to thereby comminute solid materials. Extending downwardly from the vane of the impeller through the inlet opening is a generally curved fin or blade that is concentric with the axis of rotation of the impeller and has a sharpened leading diagonal edge adapted to cut stringy fibrous material.

Abstract: An abradable rub strip for use in the compression section of a gas turbine engine is disclosed. Various construction details are developed for limiting penetration of the abradable rub strip by an array of rotor blades. A ring formed of metallic material is embedded in the abradable rub strip.

Abstract: A runner liner of fluid machine which can be attached and detached to and from the runner of the fluid machine without necessitating the disassembling of the latter. The runner liner can be fitted to a groove which is formed in the periphery of the runner, and is divided into a plurality of segments each of which being so sized that it can be brought into the runner chamber through anyone of the fluid passages coming into and out of the runner chamber. The attaching of the runner liner to the periphery of the runner is made by making use of pockets formed in the head cover and the bottom cover which in combination define the runner chamber.

Abstract: A ladder pump for use with a hydraulic dredge to increase the main pump efficiency comprises a casing and a vaned impeller located in the casing and mounted for rotation about a normally horizontal axis transverse to the ladder. The casing has an inlet and an outlet defining respective axes lying in a common plane perpendicular to the impeller axis and defining a deflection angle therebetween, with approximately 60.degree. being typical. The diameter of the impeller and the inner dimensions of the casing together define a substantial clearance over at least that portion of an impeller vane's travel between the inlet and the outlet, so that large solid objects entering the pump may pass under the impeller and out the pump outlet. The impeller may have substantially rigid vanes, or the vanes may be flexible. The ladder pump fits in-line with respect to the suction pipe, and has an axial extension little wider than the pipe itself.

Abstract: A gas path seal suitable for use with a turbine engine or compressor is provided. A shroud wearable or abradable by the abrasion of the rotor blades of the turbine or compressor shrouds the rotor blades. A compliant backing surrounds the shroud. The backing is a yieldingly deformable porous material covered with a thin ductile layer. A mounting fixture surrounds the backing.

Abstract: A centrifugal pump is constructed of a cast iron impeller and corrosion resistant means for providing a minimal clearance space between the impeller and the volute body of the pump in the form of a clearance ring mounted in the volute body to cooperate with a stainless steel tubular insert member cast into the impeller hub. The clearance ring may comprise a bendable ring which may be compressed from its normal condition to fit into a bore in the volute body so as to spring outwardly into its mounted position.

Abstract: A gas path seal suitable for use with a turbine engine or compressor is provided. A shroud wearable or abradable by the abrasion of the rotor blades of the turbine or compressor shrouds the rotor blades. A compliant backing surrounds the shroud. The backing is a compliant material covered with a thin ductile layer. A mounting fixture surrounds the backing.

Abstract: An exhaust gas turbocharger for internal combustion engines with a turbine wheel traversed by the exhaust gases radially from the outside toward the inside and with a water-cooled housing; a ring-shaped insert member of heat-resistant steel which is centered in the housing is arranged radially about the turbine wheel between the turbine wheel and the housing, which forms the outer fixed turbine wheel cover and takes over the guidance of the exhaust gases both during the entry and discharge out of the turbine wheel.

Abstract: A centrifugal pump which is easy to clean, simple to assemble and disassemble, and economical to manufacture is disclosed. The pump comprises two cast metal casing members, one of which has an integral volute wall and the other of which has an oval partition providing an inlet plenum opposite the volute wall. A wear plate is interposed between the casing members to channel fluid in the desired direction through the pump. An impeller is mounted for limited axial adjustment on its engine shaft to adjust its clearance with the wear plate. The impeller also has specially-designed slinger teeth which function to minimize wear of the impeller shaft seal.

Abstract: A pump has an outer casing, an inner casing and a rotor within the inner casing. The inner casing is of brittle material of substantially U-shaped cross-sectional configuration with the legs of the U extending into sealed axially sliding contact each with one of a pair of covers between which the rotor is disposed. A pump is provided to introduce a fluid under pressure between the inner and outer casings thereby to place the inner casing in compression to prestress the inner casing in opposition to fluid pressure peaks within the inner casing.