Imo Industries, Inc., Quabbin Division

Demag Delaval Turbomachinery Corp. Turbocare Division

Imo Industries Inc.

Demag Delaval Turbomachinery, Inc.

Turbo Care, Inc.

Demag Delavel Turbomachinery Corp. Turbocare Division

William S Dalton

Richard S Clark

Patrick S Dalton

Kevin Scott Trunkett

William G Catlow

Eric Sulda

K Scott Trunkett

James J Kosiba

A seal segment for a turbine is provided having labyrinth teeth and a brush seal disposed along the labyrinth teeth. A plurality of the segments for a seal ring. The segments are separable from each other so that the seal can retract. Each segment has two ends, each of which abuts another segment, with those ends lying along a radius (when looking down the shaft of the turbine). The brush disposed in each segment has ends that do not lie along a radius, but fit together in a tongue and groove configuration when the seal segments come together to form a seal.

Brush seal designs for turbines and similar rotary apparatus

Disclosed is an improved spillstrip ring for use in forming a tip seal in an axial flow elastic fluid turbine having one or more stages. Each turbine stage has a diaphragm and a rotor. The spillstrip ring consists of an arrangement of spillstrips mounted in a circumferentially groove formed in the diaphragm. Each spillstrip includes a body portion having a longitudinal extent, a vertical extent, and a horizontal extent, and is particularly adapted for mounting in the circumferential groove in the diaphragm. At least one projection extends from the body portion substantially parallel to the vertical extent thereof, and along the longitudinal extent of the body portion. Such projection has tapered side walls which converge to a tip seal that continuously extends along the longitudinal extent of the body portion. At least one of the spillstrips has at least one narrow channel formed entirely through a portion of the vertical extent of the body portion and beneath each projection, without interrupting the tip portion continuously extending along the longitudinal extent of the body portion. During turbine operation, the channel functions to bypass oxide particles entrained in the steam flow, around the rotor blades in order to reduce the residing time of these particles between the rotor blades and diaphragm nozzles, without interrupting the continuously extending tip seal.

Spillstrip design for elastic fluid turbines and a method of

In a steam turbine having a main inlet pipe which introduces steam to a nozzle chamber through the turbine casings and a bell seal assembly for sealing the inlet pipe relative to the casings and the nozzle chamber, the bell seal assembly including a bell seal disposed in the nozzle chamber, and a retainer nut sleeved by the bell seal and threadedly engaged in the inlet pipe, the improvement which comprises: the bell seal being replaced by a ring carrier, a stack of inner and outer sealing rings loosely sleeved on the ring carrier, the material of the inner rings having a lower coefficient of thermal expansion than the material of the ring carrier and the outer rings being made from a material having a higher coefficient of thermal expansion than the material of the nozzle chamber.

Expanding bell seal

Disclosed is an improved spillstrip ring for use in forming a tip seal in an axial flow elastic fluid turbine having one or more stages. Each turbine stage has a diaphragm and a rotor. The spillstrip ring consists of an arrangement of spillstrips mounted in a circumferentially groove formed in the diaphragm. Each spillstrip includes a body portion having a longitudinal extent, a vertical extent, and a horizontal extent, and is particularly adapted for mounting in the circumferential groove in the diaphragm. At least one projection extends from the body portion substantially parallel to the vertical extent thereof, and along the longitudinal extent of the body portion. Such projection has tapered side walls which converge to a tip seal that continuously extends along the longitudinal extent of the body portion. At least one of the spillstrips has at least one narrow channel formed entirely through a portion of the vertical extent of the body portion and beneath each projection, without interrupting the tip portion continuously extending along the longitudinal extent of the body portion. During turbine operation, the channel functions to bypass oxide particles entrained in the steam flow, around the rotor blades in order to reduce the residing time of these particles between the rotor blades and diaphram nozzles, without interrupting the continuously extending tip seal.

Spillstrip design for elastic fluid turbines

In an elastic fluid turbine employing a segmented packing ring mounted in a ring-like stationary holder or diaphragm having upper and lower half-parts which meet at a horizontal joint and circumscribe a rotor to minimize leakage between the components, interfitting butt ends on certain of the packing ring segments at the diaphragm horizontal joint, and cam pins on the diaphragm at the horizontal joint and engageable with slots in said certain of the packing ring segments for accurately positioning the packing ring segments relative to the horizontal joint.

Turbine interfitting packing with cam adjustment

In a steam turbine having retractable, spring-loaded, segmented, arcuate packaging rings and holders suspended in the turbine casing and circumscribing the turbine rotor, the packing rings and holders being interengaged by a hook fit and the packing rings being movable by steam pressure between opened and closed position relative to the holders and the rotor, the improvement which comprises providing each of the packing rings and holders with identical mating, curved profiles for providing full contact between the packing rings and holders in the opened position of the packing rings.

Retractable packing rings for steam turbines

In a turbine inclusive of: a turbine shaft having a longitudinal axis, a steam pipe, a casing circumadjacent the pipe, the pipe and casing being shiftable in vertical and transverse and axial directions relative to the longitudinal axis of the shaft, and a seal assembly disposed between the pipe and casing and comprising a stack of interdigitated relatively large and small piston rings, each large ring loosely fitting inside the shell during nonoperative conditions and having teeth firmly and sealingly engaging the casing during operative conditions; and having a coefficient of thermal expansion greater than that of the casing for expanding at a rate faster than the expansion rate of the casing under a condition of increased temperature, each small ring loosely fitting around the pipe during nonoperative conditions and having teeth firmly and sealingly engaging the pipe during operative conditions; and having a coefficient of thermal expansion less than that of the pipe for expanding at a rate slower than the expansion rate of the pipe under a condition of increased temperature, with the large and small rings tightening upon the respective casing and pipe respectively under an increasing temperature condition and shrinking from the respective shell and pipe respectively under a decreasing temperature condition, and the teeth of the rings deforming to create a complete seal.

Articulated snout rings having spaced teeth

In an elastic fluid turbine employing packing rings and spill strips or tip seals to minimize leakage between rotating and stationary components, an improvement in the packing rings and spill strips utilizing the combination of: interconnected first and second half parts, the first half part being disposed in an annular groove formed in a stationary component of the turbine, the second half part being partially disposed in a clearance area between the stationary and rotating components, the second half part having at least one seal tooth extending therefrom and contacting the rotating component, shims for selectively varying the spacing between the half parts for adjusting the sealing dimensions of the packing ring and seal strip, and bolts for interconnecting the half parts to form an integral, inseparable unit.

Turbine radial adjustable labyrinth seal

The invention comprises a measuring device for turbine packing rings which may be used for measuring the critical distance from the free ends of the packing ring teeth to the packing ring hook fit slot.

Growing community of inventors

Chesterfield, MA, United States of America

William S Dalton