Abstract: A multi-stage compressor and associated compressor housing and method are provided. The housing defines an aperture for receiving a compressor wheel for successively compressing a gas in first and second stages. First- and second-stage inlets are fluidly connected to the aperture in generally axial directions, and first- and second-stage volutes extend at least partially annularly therearound so that each volute is configured to receive gas flowing generally radially outward from the compressor wheel. In addition, first and second passages fluidly connect the first-stage volute to the second-stage inlet. Each passage extends from the first-stage volute to a position radially outward of the second-stage volute and therefrom to the second-stage inlet at an axial position opposite the second-stage volute from the first-stage volute.

Abstract: An exhaust hood for a turbine includes a shell casing, an external support structure, conical corner plates, and a butterfly plate. The shell casing includes an inner surface and an outer surface. The external support structure is coupled to the shell casing outer surface, and provides structural support to said shell casing. The butterfly plate is coupled to the shell casing inner surface for channeling flow into the exhaust hood and subsequently into the condenser. The butterfly plate has a substantially elliptically-shaped cross-sectional profile that facilitates reducing flow separation losses of steam flowing therethrough into the exhaust hood.

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 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: An impeller pump has a pump casing (6) that defines a pump chamber. The pump chamber includes a first chamber (21) and a second chamber (22). An impeller (10) is rotatably disposed within the pump chamber. The impeller has a first groove group and a second groove group on opposite surfaces. The first groove group and the second groove group oppose to the first chamber and the second chamber, respectively, so that a fluid is draw into and discharged from the first and second chambers as the impeller rotates. The flows of the fluid discharged from the first and second chambers are converged at a converging channel (26). Pulsations of the fluid discharged from the fist and second chambers are canceled each other when the flows converge at the converging channel.

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 increasing the pressure of a fluid in an aircraft centrifugal pump by forcing the fluid to make multiple passes through one impeller of the aircraft centrifugal pump is provided. It includes providing fluid through a pump inlet to an aircraft impeller inlet. The fluid then exits the impeller through a first set of discharge ports and the exiting fluid is directed to a second inlet on the same impeller. The fluid then exits the impeller through a second set of discharge ports to a pump outlet. Each pass through the impeller by the fluid increases the pressure thereof.

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 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: An arrangement to regulate the flow of steam extracted intermediately from a steam turbine and to induce a steam flow, between separate turbine parts, in a direction that is essentially axial with respect to the rotational direction of the turbine rotor. The steam turbine consists of two turbine parts separated by a partition wall and has an intermediate steam extraction outlet located between the first turbine part and the partition wall. Steam may pass between the two turbine parts through a passage, within the partition wall, having an externally controlled valve used to regulate the steam flow. The valve is configured to reduce the external force needed to control its position. Together, the valve and passage are configured to minimize the pressure loss and turbulence of the steam flow as it passes between the two turbine parts so that the steam flow pressure on the second turbine part is maximized.

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: A portable air-blowing working machine includes a prime mover and an air-blowing system. The air-blowing system incorporates first-stage and second-stage centrifugal air-blowing sections, which are rotatably driven by an output shaft of the prime mover and are interconnected by an air-blowing passage for delivering air discharged from the first-stage air-blowing section to the intake of the second-stage air-blowing sections. The inlet portions of the air-blowing passage are respectively positioned at the outer circumferential portion of a volute chamber of the first air-blowing section, and the outlet portion of the air-blowing passage is positioned near the air-intake port of the secondary air-blowing section.

Abstract: A portable air-blowing working machine includes a prime mover and an air-blowing system. The air-blowing system incorporates first-stage and second-stage centrifugal air-blowing sections, which are rotatably driven by an output shaft of a prime mover and are interconnected by an air-blowing passage for delivering air discharged from the first-stage air-blowing section to the intake of the second-stage air-blowing section. The first-stage air-blowing section and the second-stage air-blowing section share a common unitary double fan, which includes fore and rear centrifuged fan blades mounted on the fore (first stage) and rear (second stage) faces of a main disk plate integrally mounted on the output shaft of the prime mover.

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: A two-stage, high-pressure centrifugal pump comprises a pump housing and at least one pair of external inlets and outlets for charging and discharging each stage of the pump. The inlets and outlets are located through the periphery of the pump for allowing on-line maintenance. Prerotator vanes are located along the interior wall of the pump housing and convey a fluid from the external inlet to the impeller while reducing the inlet relative velocity at the impeller inlet and primarily at the impeller inlet tip. A pair of face-to-face impellers located along the pump shaft are designed to increase the fluid velocity while transferring fluid to a vaneless radial diffuser. The diffuser then decreases fluid velocity and increases fluid pressure due to increasing diffuser volume. From the diffuser the fluid is conveyed into a fold-over volute which is likewise designed to increase fluid pressure while additionally eliminating flow patterns which would increase losses within the system.

Abstract: A single-shaft multi-stage centrifugal compressor has a multiplicity of impellers for compressing a main gas and an impeller for compressing an intermediate suction gas which are carried by the same impeller shaft. The suction pressure of the impeller constituting the final stage for the compression of the main gas is maintained higher than the suction pressure of the impeller for compressing the intermediate suction gas. With this arrangement, a part of the main gas of a pressure slightly higher than the intermediate suction gas is introduced into the shaft seals, and the shaft seals and drainers are protected from any corrosive and toxic components which may be contained by the intermediate suction gas.

Abstract: A multi-stage metallic pump or chemical pump with plural impellers arranged in series. The impeller of the 1st-stage is integrally provided with radial flow ribs on the under surface of the impeller and with backside radial ribs on the upper surface of the impeller, which are larger than the front radial flow ribs as regards the diameter of the circle formed by the tips of the respective ribs. A flange is formed as an extension beyond the circumference of the 1st-stage impeller and is integrally provided with a protruding ring on the upper surface of the flange. The protruding ring rotates in a fixed recess formed in a casing, with a certain gap kept. Because of the rotation, the liquid which flows into the clearance between the fixed wall of the casing and the rotating ring creates a turbulent flow there, preventing movement of air there through.

Abstract: A sealing system for use in a composite multi-stage pump or pumps is disclosed which utilizes part of the liquid pressurized by the pump to moderate sealing conditions by introducing said liquid to a portion or portions around the shaft, where the sealing conditions are most critical, and by thus reducing the pressure imposed on the sealing portion make the designing of seals easy. Also, by introducing pressurized liquid of relatively low temperature to the critical portion(s), minimum flow rate is lowered and thus the operational range of the pump is extended.When two or more pumps are employed for maintaining continuous operation by alternately switching the working pumps, a flow passage is provided between the pumps so the pressurized liquid from the pump under operation can be introduced to the non-operating pump, thus utilizing the pressurized liquid to prevent liquid kept under pressure in the non-operating pump from leaking therefrom.

Abstract: An integral vacuum pump for producing ultra-high vacuums including, in combination, axial turbomolecular, centrifugal compressor and vortex diode pumping means.