Abstract: A casing half shell for a turbine system, a steam turbine system and related method are provided. The casing half shell includes a body having an open interior for enclosing parts of the turbine system; a first inlet in the body for delivering a first working fluid flow into the open interior in a first direction; and a second inlet in the body for delivering a second working fluid flow into the open interior in a second direction that is opposed to the first direction. A working fluid dam extends radially and axially in the body between the first inlet and the second inlet, the working fluid dam includes a stress-mitigating slot extending radially therein. A fill member may be mounted in the stress-mitigating slot to provide full functioning of the working fluid dam.

Abstract: A set of turbines, including: a first turbine including a first shaft supported in an overhung manner in a first case, a first rotor provided with first rotor blades and joined to a distal end of the first shaft; a second turbine including a second shaft supported in an overhung manner in a second case, and a second rotor provided with second rotor blades and joined to a distal end of the second shaft. A first front face of the first rotor faces a second front face of the second rotor. The set of turbines further includes a connection element connected to the first front face and to the second front face to transmit rotation from the first shaft to the second shaft or vice versa. The connection element includes at least one elastic joint configured to minimize the rotordynamic influence of the first and second turbine on each other.

Abstract: A steam turbine includes a flow guide placed about a rotor shaft and forming a side wall of a diffuser. The flow guide is formed in such a substantially truncated conical shape that a first portion having a semi-circular-arc cross section and a second portion having a semi-circular-arc cross section and exhibiting less thermal deformation than the first portion are combined together. A coupling portion of the first portion with the second portion has a first protrusion protruding, in the circumferential direction thereof, more on a rotor shaft side than on a steam flow path side of the diffuser. A coupling portion of the second portion with the first portion has a second protrusion protruding, in the circumferential direction thereof, more on the steam flow path side of the diffuser than on the rotor shaft side and overlapping with the first protrusion in the radial direction of the flow guide.

Abstract: The axial flow expander includes: an outer casing provided with a suction port and a discharge port through which gas is discharged from the outer casing; an inner casing inside which a gas passage is formed and which is provided with a first communication portion which communicates the gas passage with the suction port and a second communication portion which communicates the gas passage with the discharge port; a rotor shaft which extends in the direction along an axis; a bearing configured to bear the rotor shaft; stator vanes which protrudes inward from an inner periphery of the inner casing; and moving blades which protrudes outward from the rotor shaft. The inner casing, the rotor shaft, the bearing, the stator vanes, and the moving blades are integrally assembled, and the assembled members are inserted into the outer casing.

Abstract: A spacer for a diaphragm assembly coupling is disclosed. The spacer includes a base, a spacing portion, and a spacing body edge. The base includes a base body including a base edge. The spacing portion includes a spacing body and a spacing flange. The spacing body extends from the base and includes an outer diameter that is smaller than that of the base. The spacing flange extends outward from the spacing body and is spaced apart from the base. The spacing body edge is located at an intersection of the spacing body and the base body. A reference line extending from the spacing body edge to the base edge forms an angle from 10 to 30 degrees with the spacer axis.

Abstract: A steam turbine housing is provided having a housing wall and a stiffening cradle attached to the inner side which has two encircling inner webs which are arranged axially adjacent to one another and which project radially inward from the housing wall. Between the inner webs, running parallel and axially centrally, a central web is attached to the inner side of the housing wall, the radially inner edge of which is straight, wherein at the radially inner edge of the central web, the central web forks in a Y-shaped manner inward into two transition webs which extend to and merge into the adjacent inner web, such that the inner webs are fastened directly to the housing wall outside the circumferential extent of the transition webs and are fastened to the housing wall via the transition webs and the central web within the circumferential extent of the transition webs.

Abstract: A reaction turbine has channels formed in the top surface of a disc to create nozzles. The channels can be covered by a membrane sealed to the disc or by the housing extended from a combustor. Each channel may have a first section extending radially outwardly from an inlet of the reaction turbine and a second curved section extending from the first section to a periphery of the disc. A reaction turbine may also receive input from an impulse turbine. Fluid flows through the impulse turbine and fluid from the impulse turbine enters an inlet of the reaction turbine. The reaction turbine may have cooling channels and cooling fins to lower the temperature of the disc during operation. In addition, magnets may provide bearing support and electricity generation. In addition, the reaction turbine may have a dual shaft construction, with each shaft connected to a reaction turbine. One reaction turbine powers a compressor, while the second reaction turbine powers a load through the second shaft.

Abstract: The method for retrofitting a double flow steam turbine includes opening an outer casing of the steam turbine, removing the blade carriers and the stator blades, removing the inner casing with inlet belt, removing the double flow rotor and the rotor blades. Thus, the method includes the further steps of providing a new single flow rotor and new rotor blades different from the rotor blades connected to the double flow rotor, providing balancers connected to the single flow rotor, to balance the axial thrust, providing new stator blade carriers and new stator blades different from the stator blades associated to the double flow rotor, providing a new inner casing with inlet belt, providing a passage between the inner casing and the outer casing, closing the outer casing.

Abstract: The present disclosure relates to a propfan engine comprising: one or more rotor stages comprising a plurality of rotors; and an outer wall comprising an outer profile, at least a portion of the outer profile defining a substantially circular cross-section, wherein the diameter of the substantially circular cross-section increases in the direction of flow over the outer wall and downstream of a leading edge of the rotors, and the diameter increases at substantially all points defining the circumference of the substantially circular cross-section.

Abstract: A cooling path is defined through a double-flow steam turbine. The steam turbine includes a generator end and a turbine end and a double-flow tub diaphragm disposed axially between the generator end and the turbine end. A first stage of the steam turbine includes a plurality of first stage nozzles and a plurality of first stage buckets, and a steam path is defined from an inlet region, through the turbine end, to a steam outlet. The cooling path includes cooling holes in the tub diaphragm and root radial seals permitting steam flow beneath the tub diaphragm and around the first stage nozzles and back into the steam path before the first stage buckets.

Abstract: A steam turbine includes a turbine rotor, a generator end having a generator end first stage with a first reaction, and a turbine end having a turbine end first stage with a second reaction not equal to the first reaction. The steam turbine includes a tub section disposed between the generator end and the turbine end, the turbine rotor and the tub section defining an annulus therebetween. A difference between the first reaction and second reaction is capable of urging a steam flow through the annulus for reducing a temperature of the turbine rotor. A method of cooling the turbine rotor is also disclosed.

Abstract: Disclosed herein is a method of minimizing losses in a multiple-last-stage bucket turbine. The method includes, determining an inlet flow available for the multiple-last-stage bucket turbine, and selecting multiple last-stage buckets from a set of pre-designed last-stage buckets. The multiple last-stage buckets having inlet flows different from one another that when combined match the inlet flow available with a lower total exhaust loss than from multiple same sized last-stage buckets from the set of pre-designed last-stage buckets.

Abstract: A method of cooling a double flow steam turbine includes supplying steam flow to each nozzle of the sections of the turbine; reversing a portion of each steam flow to provide a reverse steam flow from an aft side to a forward side of each section. Each reverse steam flow is directed to an annular space between a rotor and a tub. The method further includes removing the reverse steam flows through a pipe, the pipe having a first end at the annular space at a first pressure and a second end at a second pressure that is lower than the first pressure. A double flow steam turbine, includes a pair of nozzles, each nozzle being provided at a section of the turbine; a rotor supporting buckets of the sections; a tub supporting the pair of nozzles; and a pipe extending from an annular space between the tub and the rotor. The pipe has a first end at the annular space and second end. A pressure at the first end of the pipe is greater than a pressure at the second end.

Abstract: A pump configured to receive fluids through an inlet and direct those fluids in two directions through two or more fluid discharge outlets, wherein the fluids are discharged with different fluid characteristics, such as different pressures or flow rates. In one embodiment, the pump may include first and second pumping chambers for pumping fluids from the pump with different pressures or flow rates, or both, eliminating the need for two pumps. The fluid may be exhausted from the pump through a first fluid discharge outlet and a second fluid discharge outlet of the pump.

Abstract: A method and system for assembling a turbine is provided, wherein an annular nozzle carrier is positioned radially inwardly from a casing such that a cavity is defined between the nozzle carrier and the casing. The method and system also includes a flange that is extended from at least one of a leading edge of the annular casing and a leading edge of the nozzle carrier, and a seal ring that is extended between the nozzle carrier and the casing such that the seal ring seals the cavity, wherein the seal ring is positioned between the flange and at least one of the nozzle carrier and the casing.

Abstract: A flow splitter directs inlet steam in axially opposite directions in a double flow steam turbine. The flow splitter includes a main ring having a radially outer apex with annular concave surfaces extending inwardly from and in opposite axial directions on opposite axial sides of the apex. A second ring is secured on one axial side of the main ring by welding to the main ring and has a concave outer surface portion which completes the concave surface of the flow splitter along the opposite axial side of the flow splitter.

Abstract: Method and apparatus for assembling a double flow steam turbine is provided. The method comprises providing an annular member having a first end, a second end, and a body extending therebetween, coupling a first arcuate member to the annular member wherein the first member includes a radially inner surface that defines an inner diameter of the first member and an opposite radially outer surface that defines an outer diameter of the first member, wherein the inner surface is substantially parallel to the outer surface, and coupling a second arcuate member to the annular member wherein the second member includes a radially inner surface that defines an inner diameter of the second member and an opposite radially outer surface that defines an outer diameter of the second member. The method also comprises coupling the second member to the first member such that a steam turbine flow splitter is formed.

Abstract: A drum-type rotor carries an annular row of moving blades having root portions held within a slot in the periphery of the rotor. A turbine casing surrounds the rotor and carries a static blade assembly with an annular row of static blades which, together with the annular row of moving blades, constitutes an impulse turbine stage. The static blade assembly has a radially inner static ring confronting a periphery of the rotor with a seal acting therebetween. The static blade assembly has an outer static ring which has a substantially greater thermal inertia and stiffness then the inner static ring and is capable of sufficient radial sliding relative to the casing so as to accommodate relative thermal expansion and contraction of the outer static ring and the turbine casing.

Abstract: In a turbo-molecular pump with a high vacuum-side induction area and of a rotational symmetrical arrangement, comprising a compressor turbine including a rotor and a stator tube having axially alternately tightly arranged rotor blade rings and stator vane rings with oppositely oriented blade and vane surfaces, a pre-vacuum chamber with a gas guide structure for the connection of a pre-pumping system, a drive module and a bearing unit, the turbo-molecular pump has a center area with a central coaxial open space extending from an ambient end to the high vacuum-side induction area and the open space is closed at its end adjacent the ambient end thereof by a flange in a vacuum-tight manner or is connected to a vacuum recipient, and the high-vacuum end of this space is separated from a pre-vacuum space.

Abstract: A double-ended variable speed blower for Continuous Positive Airway Pressure (CPAP) ventilation of patients includes two impellers in the gas flow path that cooperatively pressurize gas to desired pressure and flow characteristics. Thus, the double-ended blower can provide faster pressure response and desired flow characteristics over a narrower range of motor speeds, resulting in greater reliability and less acoustic noise.

Abstract: The shafts of upstream and downstream turbines are interconnected by a coupling. A diffuser is provided in an intermediate cavity between the upstream and downstream turbines to recover kinetic energy, as well as minimize or eliminate windage and spinning losses resultant from exposure of the coupling to the flowpath along the turbines. A radial entry inlet provides a supplemental fluid admission into the intermediate cavity, the admission being turned axially and circumferentially for joining with the flow exiting the upstream turbine for combined flow to the downstream turbine.

Abstract: A method of assembling a steam turbine includes positioning a sealing member in a leakage path defined between a first stage nozzle diaphragm and a packing casing, wherein the first stage nozzle diaphragm has a first coefficient of thermal expansion, and the packing casing has a second coefficient of thermal expansion, and coupling the first stage nozzle diaphragm and the packing casing such that the sealing member is fixedly secured between the first stage nozzle diaphragm and the packing casing.

Abstract: A first steam turbine of a reaction stage design is retrofitted to form a second turbine of a substantially impulse stage design using common components with the first turbine. To retrofit the new steam path into the first turbine, the upper outer and inner shells and rotor of the first turbine are removed leaving the lower outer shell. A lower carrier section is installed in the lower outer shell. A lower inner shell forming part of the new steam path is installed on the lower carrier ring. The rotor forming part of the new steam path is installed. The upper inner shell is bolted to the lower inner shell encompassing the rotor and an upper carrier section is bolted to the lower carrier section. Finally, the upper outer shell is bolted to the lower outer shell. Consequently a new steam path of reduced diameter is retrofitted into a prior turbine using the prior turbines outer shell.

Abstract: The shafts of upstream and downstream turbines are interconnected by a coupling. A diffuser is provided in an intermediate cavity between the upstream and downstream turbines to recover kinetic energy, as well as minimize or eliminate windage and spinning losses resultant from exposure of the coupling to the flowpath along the turbines. A radial entry inlet provides a supplemental fluid admission into the intermediate cavity, the admission being turned axially and circumferentially for joining with the flow exiting the upstream turbine for combined flow to the downstream turbine.

Abstract: A first steam turbine of a reaction stage design is retrofitted to form a second turbine of a substantially impulse stage design using common components with the first turbine. To retrofit the new steam path into the first turbine, the upper outer and inner shells and rotor of the first turbine are removed leaving the lower outer shell. A lower carrier section is installed in the lower outer shell. A lower inner shell forming part of the new steam path is installed on the lower carrier ring. The rotor forming part of the new steam path is installed. The upper inner shell is bolted to the lower inner shell encompassing the rotor and an upper carrier section is bolted to the lower carrier section. Finally, the upper outer shell is bolted to the lower outer shell. Consequently a new steam path of reduced diameter is retrofitted into a prior turbine using the prior turbines outer shell.

Abstract: A steam turbine has a turbine shaft directed along a turbine axis. A plurality of turbine stages, each include a guide-blade structure and a moving-blade configuration located axially downstream of the guide-blade structure. The guide-blade structure and the moving-blade configuration are provided along the turbine shaft. Each stage has an average reaction degree achievable between 5% and 70%. The reaction degree of at least two turbine stages is of different values.

Abstract: A steam turbine has a high-pressure turbine section and a medium-pressure turbine section fluidically connected to the high-pressure turbine section. The high-pressure turbine section is a chamber configuration and the medium-pressure turbine section is a drum configuration. Alternatively, the high-pressure turbine section is a drum configuration and the medium-pressure turbine section is a chamber configuration. Alternatively, or additionally, the high-pressure turbine section is a double-flow configuration and the medium-pressure turbine section is a double-flow configuration.

Abstract: A steam turbine comprising a rotor shaft integrating high and low pressure portions provided with blades at the final stage thereof having a length not less than 30 inches, wherein a steam temperature at first stage blades is 530° C., a ratio (L/D) of a length (L) defined between bearings of the rotor shaft to a diameter (D) measured between the terminal ends of final stage blades is 1.4 to 2.3. This rotor shaft is composed of heat resisting steel containing by weight 0.15 to 0.4% C, not more than 0.1% Si, 0.05 to 0.25% Mn, 1.5 to 2.5% Ni, 0.8 to 2.5% Cr, 0.8 to 2.5% Mo and 0.15 to 0.35% V and, further, the heat resisting steel may contain at least one of Nb, Ta, W, Ti, Al, Zr, B, Ca, and rare earth elements.

Abstract: A steam turbine in which principal components to be exposed to high temperatures are all made of ferritic steel, whereby the temperatures of main steam and reheat steam can be increased to 610-660 (° C.). The rotor shaft (23 in FIG. 1) of the steam turbine is made of ferritic forged steel whose 100,000-hour creep rupture strength is at least 15 (kg/mm2) at the service temperature of the rotor shaft. Likewise, the casing (18) is made of ferritic cast steel whose 100,000-hour creep rupture strength is at least 10 (kg/mm2). The steam turbine of high thermal efficiency can be applied to a steam-turbine power plant.

Abstract: A turbomachine, especially a steam turbine, includes a casing, an inflow region formed at least in part by the casing for guiding working fluid, a feed for a cooling fluid, a rotating-blade carrier disposed in the casing and extending along a principal axis, and a shielding element disposed in the inflow region for shielding the rotating-blade carrier from the working fluid. The shielding element is attached to the casing by a mounting and the feed is guided through the mounting. A method is also provided for cooling one or more components of a turbomachine adjoining an inflow region for a hot working gas.

Abstract: High velocity vacuum pump, such as turbomolecular pump, drag pump, centrifugal pump or the like, comprising a stator (10) and a rotor (18,43,53), which is axially and radially suspended with respect to the stator (10) by magnetic bearings (27). The vacuum pump may comprise two at the same rotor provided, parallelly acting pump portions, each one comprising two pumping steps. The rotor may be cylindrical and rotates around an inner stator shaft and within an outer stator portion. In that way, one pumping step (22) is formed between the inner stator shaft and the rotor and another pumping step (24) between the outer stator portion (10) and the rotor. The magnet bearing comprises at least one rotation symmetric magnet (27) and is disposed to give rise to a rotation symmetric magnetic field which is centered around the rotational axis.

Abstract: A turbine shaft extends along a principal axis and has an outer surface. The turbine shaft is formed by a plurality of cylindrical shaft segments which are disposed axially one behind the other and are braced together by a bracing element. An axial gap which is formed between the bracing element and at least one shaft segment is connected in terms of flow to two axially spaced radial passages. The radial passages each open at the outer surface of the turbine shaft. A method for cooling a turbine shaft is also provided.

Abstract: An electric motor includes a pump leg on the driving side thereof, and a bracket, a flange, discharge joints, extension tubes and a volute chamber cover are integrated into the pump leg 6. The extension tubes are arranged opposite to each other at the positions spaced away from each other by an angle of about 180 degrees in the circumferential direction. A volute chamber of a first pump and a volute chamber of a second pump are formed integral with a distance suction casing fixedly secured to the lower surface of the pump leg while a suction port for the first pump is located opposite to a suction port of the second pump. In addition, a volute chamber cover is fixedly secured to the lower surface of the distance suction casing.

Abstract: Improved methods and apparatus for retrofitting longer last row rotational blade assemblies in steam turbines are disclosed. The apparatus of the present invention permits the exhaust flow guide to be mounted directly to modified last row stationary turbine blades. In a preferred embodiment, the outer blade ring of the last row of stationary blades in a steam turbine is modified by machining two grooves which permit a modified blade assembly outer ring and integral blade ring extension to be mounted in the turbine. The extension section is configured to accept connecting means, such as bolts, which permit the direct attachment of an exhaust flow guide to the modified outer blade ring at each end of the turbine. The present invention simplifies the attachment of such flow guides and can improve the harmonic characteristics of the turbine by lowering the natural frequency of the assembly and include the mass of the flow guide in the mass of the stationary blade assemblies.

Abstract: A steam turbine has an outer blade ring supporting a row of stationary blades and an adjacent downstream row of long rotatable blades. The outer blade ring has a generally conical flow-guiding surface for outwardly guiding the steam as it flows through the row of stationary blades. The outer blade ring is supported by a radially juxtaposed carrier ring having a flow-guiding surface axially adjacent to and extending outwardly from the flow-guiding surface of the outer blade ring. A spacer ring is axially adjacent to the carrier ring and has a flow-guiding surface adjacent to and extending outwardly from the flow-guiding surface of the carrier ring. An exhaust flowguide is axially adjacent the spacer ring and radially adjacent the row of rotatable blades for guiding the steam from the rotatable blades.

Abstract: A Rankine cycle power plant includes a plurality of vapor turbine modules, each having a shaft rotatably mounted in a housing, and a pair of axially spaced discs coupled together and mounted on the shaft for rotation therewith. Axial flow turbine blades are mounted on the periphery of each disc such that the blades on one disc are spaced from the blades on the other disc thus defining an annular space in the housing within which a circular nozzle ring is located, the ring having a plurality of nozzles that open toward the blades on each disc for directing vapor in opposite axial directions into the blades on each disc.

Abstract: A turbine having structure for reducing thermal deformation caused by thermally created loads directed parallel to the axis of rotation of the rotor, which structure includes a stator assembly, positioned within a casing and about said rotor, wherein the casing has an inlet defined by sidewalls, the stator assembly having an inlet for directing a flow of steam, wherein the inlet is defined by first blade rings connected to the casing sidewalls and having a stationary annular row of blades connected to each of the blade rings and operatively positioned in relation to the rotor blades for directing a flow of steam onto the rotor blades and having a number of ribs disposed within said stator assembly about said rotor, wherein the ends of said ribs are spaced away from the sidewalls and the first blade rings.

Abstract: An axial-admission steam turbine, includes a steam inflow region, guide vane rings including a first guide vane ring, guide vanes of the first guide vane ring having radially inner ends, a shaft being rotatable in a given direction, an annular shaft shield being connected to the radially inner ends of the guide vanes of the first guide vane ring and being disposed in vicinity of the steam inflow region, the annular shaft shield surrounding the shaft at a distance defining a ring canal therebetween, the annular shaft shield having nozzles formed therein for discharging into the ring canal tangentially relative to the shaft as seen in the given direction of rotation of the shaft.

Abstract: A power turbine employs a plurality of turbine blades each having a normal lip mounted at the free ends thereof. The plurality of turbine blades are mounted in a paddle wheel type configuration about the turbine power shaft. The paddle wheel blade configuration is interposed between the pressurized fluid inlet and outlet ports for efficient response to the pressurized fluid moving therebetween. Directional fans mounted about the rotating shaft maintain the fluid flow through the turbine so as to assure an optimum power as offered by the rotating turbine shaft. A home power generation system utilizing the turbine is also disclosed herein.

Abstract: In a low pressure steam turbine which is constructed by an inner casing for supporting a rotatable turbine blade and an outer casing for supporting the inner casing, the outer casing is provided with a guide plate for causing the steam to flow laterally outward from the sides of the outer casing.

Abstract: Steam introduced into a turbine casing from a steam inlet is longitudinally divided and each divided steam portion flows in respective first stages which are disposed on the shaft adjacent to each other. The shaft and a plurality of disks which are manufactured independently are made integral by a thermal shrink. In order to reduce the thermal distortion effects on the shaft caused by keys interconnecting the disks and shaft, first key grooves formed on an outer surface of the shaft and an inner surface of the disks of one first stage and a first key closely disposed in the first key grooves are arranged in symmetry with respect to the center of the shaft, to second key grooves formed on an inner surface of the disk of the other first stage with a second key closely disposed in the second grooves. Other preferred embodiments include dummy grooves and keys to balance the thermal distortion effects of the keys interconnecting the disks and shaft.

Abstract: A low pressure casing structure of a single shell type which houses, in a low pressure casing, a turbine rotor having turbine blades mounted thereon in a multiplicity of stages, including a heat admitting portion located in an upper central part of the low pressure casing and formed therein with a steam admitting port for admitting turbine driving steam therethrough into the interior of the casing, turbine diaphragms rigidly secured to an inner surface of the casing for supporting stationary blades arranged in a multiplicity of stages axially of the turbine in association with the turbine blades of the turbine rotor, exhausted steam chambers each located at one of opposite ends of the casing axially of the turbine for receiving steam of low temperature and low pressure exhausted thereinto after doing work in the turbine, and a shell of the casing connecting the steam admitting portion to the exhausted steam chambers.

Abstract: Low pressure turbine installation comprising a casing, at least two groups of turbine stages mounted in said casing, each turbine stage having blades so arranged that a flow of steam passes through the respective turbine stages in contraflow manner, partition means in said casing for separating the opposed final stages of said turbine stages from each other, and steam exhausting means opened in the side walls of said casing in a direction substantially perpendicular to the axis of said turbine, said steam exhausting means being connected to condensers.