Abstract

In the invention, stator blades are arranged in such a manner that respective intervals between the adjacent stator blades (SV) become unequal at least partly. If the stator blades are arranged as mentioned above, there are formed wave fronts having different moving directions and phases, and these wave fronts are interfered with each other so as to be attenuated. Accordingly, an interference noise is reduced. Therefore, in accordance with the invention, it is possible to reduce an interference noise without enlarging a rotor stator blade interval as well as reducing a used amount of a sound absorption material.

IPC Classes  ?

• F01D 9/02 - NozzlesNozzle boxesStator bladesGuide conduits

Abstract

A turbofan engine of the invention is provided with a fan first-stage moving blade for taking an air therein, and a spinner rotationally driving the fan first-stage moving blade, the spinner has a spiral blade extending spirally to an outer side in a radial direction, sucking the air from a front face of the spinner and supplying the air to the fan first-stage moving blade. Further, the fan first-stage moving blade and the spinner are integrally coupled, and the spiral blade and the fan first-stage moving blade are formed such that blade surfaces are smoothly connected.

IPC Classes  ?

• F04D 17/06 - Helico-centrifugal pumps

Abstract

An electrode for an electrical-discharge surface-treatment method is molded with a metallic powder or a metallic compound powder having an average grain diameter of 6 micrometers to 10 micrometers. A coat on a surface of a workpiece is formed with a material constituting the electrode or a substance that is generated by a reaction of the material due to a pulse-like electrical discharge. The coat is built up with a material containing metal as a main constituent under conditions of a width of a current pulse for the pulse-like electrical discharge in a range of 50 microseconds to 500 microseconds and a peak of the current pulse equal to or less than 30 amperes.

IPC Classes  ?

• C23C 14/34 - Sputtering

Abstract

A three-gear type gear pump or double gear pump wherein the first driven gear and the second driven gear are opposed to one another with the driving gear disposed between them, wherein the number of teeth of the driving gear is greater than the number of teeth of each of the first driven gear and the second driven gear.

IPC Classes  ?

• F04C 18/00 - Rotary-piston pumps specially adapted for elastic fluids
• F04C 2/00 - Rotary-piston machines or pumps

Abstract

A turbofan engine has a fan on a front side thereof and a turbine driving the fan. The turbofan engine includes a disk rotationally driven by the turbine, a spinner detachably mounted at a front side of the disk, a spiral blade integrally mounted on a surface of the spinner, and a rear moving blade detachably mounted on an outer circumferential surface of the disk. The spiral blade and the rear moving blade form a first-stage moving blade of the fan.

IPC Classes  ?

• F02K 1/38 - Introducing air inside the jet

Abstract

A wall configuration of an axial-flow machine which can reduce the secondary flow loss is provided. A trough is formed between a blade and another blade in the blade row and extends in at least an axial direction of the blade row. The region where the trough is formed is axially between a leading edge and a trailing edge of the blade. A center line of the trough has a curvature in the same direction as a camber line of the blade. A maximum amplitude of the trough is located adjacent to an axial center of the blade or located axially between the axial center and the leading edge of the blade.

IPC Classes  ?

• F01D 9/02 - NozzlesNozzle boxesStator bladesGuide conduits

Abstract

For forming a coating exhibiting excellent abrasion resistance over a temperature range from low temperature to high temperature, there is provided a method comprising the steps of preparing a metal powder containing a component capable of exhibiting lubricity upon oxidation thereof; oxidizing the metal powder so that the amount of oxygen contained in the metal powder is increased from 6 wt.% to 14 wt.%; and melting or semi-melting the metal powder so as to form on a treatment object a coating having such a structure that in a unit area of molten or semi-molten state, there are distributed regions of 3 wt.% or less oxygen content and regions of 8 wt.% or more oxygen content, the content of oxygen as a whole after the melting or semi-melting in the coating ranging from 5 wt.% to 9 wt.%.

IPC Classes  ?

• C23C 26/00 - Coating not provided for in groups

Abstract

This invention provides a PCVD process, which can form microcrystalline silicon using hydrogen gas at a low flow rate, and provides a microcrystalline silicon solar cell at lower cost. The method for microcrystalline silicon formation by the PCVD process is characterized by comprising arraying a plurality of antennas, both ends of which are connected respectively to a high-frequency power supply and a ground, within one plane in a vacuum chamber to constitute an array antenna structure, disposing the substrate so as to face the array antenna, raising the temperature of the substrate to 150 to 250ºC, introducing a mixed gas containing hydrogen gas and silane gas into the system, supplying a high-frequency electric power to the plurality of antenna to generate plasma, and regulating the hydrogen gas/silane gas flow rate ratio in the range of 1 to 10 to form, on the substrate, such a microcrystalline silicon film that the ratio between a crystalline silicon-derived Raman scattering intensity at a wavenumber around 520 cm-1, Ic, and a noncrystalline silicon-derived Raman scattering intensity at a wavenumber around 480 cm-1, Ia, i.e., Ic/Ia, is 2 to 6.

IPC Classes  ?

• C23C 16/509 - Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges using radio frequency discharges using internal electrodes
• C23C 16/24 - Deposition of silicon only
• H01L 31/04 - SEMICONDUCTOR DEVICES NOT COVERED BY CLASS - Details thereof adapted as photovoltaic [PV] conversion devices

Abstract

b side of the mixing portion 3 than the swirling flow. The burner for combustion chamber and combustion method of the present invention can shorten the flame length in the central axial direction by improving the combustion efficiency even during low loading and shorten the overall length of the burner for combustion chamber in the central axial direction.

IPC Classes  ?

• F02C 1/00 - Gas-turbine plants characterised by the use of hot gases or unheated pressurised gases, as the working fluid
• F02G 3/00 - Combustion-product positive-displacement engine plants

Abstract

b thereof, and spaced at a fixed angle in a peripheral direction. The fan 20 has a dovetail portion 22 extending at the same angle as an angle of the dovetail groove and capable of being fitted to the dovetail groove, in an inner end thereof.

IPC Classes  ?

• F01D 5/30 - Fixing blades to rotorsBlade roots
• F04D 29/34 - Blade mountings

Abstract

a). An opening through which the oil shield member (21) passes is formed in the seal housing (25), and the seal housing (25) is brought into contact with the seal member (23) in an inner edge in a radial direction forming the opening.

IPC Classes  ?

• F04B 9/14 - Pumps characterised by muscle-power operation
• F04B 17/02 - Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by wind motors
• F02B 33/44 - Passages conducting the charge from the pump to the engine inlet, e.g. reservoirs

Abstract

Stator vanes (SV) are arranged such that the intervals between adjacent stator vanes become unequal at least partially. When the stator vanes are arranged in such a manner, wave fronts having different traveling directions and phases are formed; since they interfere with each other and attenuate, interference noise is reduced. Consequently, the amount of acoustic material used can be reduced and interference noise can be reduced without enlarging the interval between rotor and stator vanes.

IPC Classes  ?

• F04D 29/54 - Fluid-guiding means, e.g. diffusers

Abstract

The rolling mill comprises a pair of work rolls for rolling a plate material in the thickness direction, a guide for guiding the leading end of the plate material between the work rolls, and a rolling oil supply member for supplying rolling oil between the work rolls through a rolling oil passage formed within the guide. The rolling mill further comprises a temperature adjusted oil passage formed within the guide separately from the rolling oil passage, and a temperature adjusted oil supply member for applying temperature adjusted oil having a different temperature from the rolling oil to the work rolls through the temperature adjusted oil passage so as to control the crown rate of the work rolls, improving the controllability of the crown rate of the work roll.

IPC Classes  ?

• B21B 37/28 - Control of flatness or profile during rolling of strip, sheets or plates

Abstract

It is possible to obtain an electric discharge surface treating method and an electric discharge surface treating apparatus capable of forming a dense and relatively thick film coating. When a voltage is applied to the inter-electrode gap between an electric discharge electrode (21) and a work (22) from a first power supply (23) and an electric discharge occurs, a voltage for generating a second electric discharge current is supplied to the inter-electrode gap from a second power supply (28) for a short period of time. The second electric discharge current is superimposed on a first discharge current generated by the first power supply (23) and has a larger current value than the first current. This allows an electric discharge pulse current of a high-current value and a short pulse width having a rising speed of at least 40 A/쎽s or more to flow through the inter-electrode gap. As a result, only a necessary part of the electrode material is quickly melted and a large ratio of the melted electrode material can be contained in the electrode material migrating to the work side by the thermal energy of electric discharge or a compound of the electrode material, so that a film coating of the melted metal is formed on the surface of the work.

IPC Classes  ?

• C23C 26/00 - Coating not provided for in groups

Abstract

An electrode is used to perform discharge surface treatment of a work piece. The electrode is made of a green compact obtained by compression-molding an electrode material including powder of any of a metal, a metallic compound, and ceramics. The discharge surface treatment includes generating an electric discharge between the electrode and the work piece in an atmosphere of a machining medium and forming a film consisting of a machining material on a surface of a work piece using energy produced by the electric discharge. The powder has an average particle diameter of 5 micrometer to 10 micrometers, and contains 40 volume percent or more of a component not forming or less easily forming carbide as a component for forming the film on the work piece. The electrode has a hardness in a range of B to 8B tested with a pencil scratch test for a coating film.

IPC Classes  ?

• H05H 1/48 - Generating plasma using an arc
• C23C 16/48 - Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating by irradiation, e.g. photolysis, radiolysis, particle radiation

Abstract

An electrode for electric discharge surface treatment is a green compact formed by molding a metal powder, a metal compound powder, or a ceramic powder, and is used for electric discharge surface treatment in which an electric discharge is generated between the electrode and a work in dielectric fluid or air to form by the electric discharge energy on a surface of the work a coat of a material of the electrode or of a substance resulting from reaction of the material due to the electric discharge energy. The material of the electrode includes a material not desired to be carbonized and a material desired to be melted, and a particle diameter of the material not desired to be carbonized is larger than a particle diameter of the material desired to be melted.

IPC Classes  ?

• B23H 1/06 - Electrode material
• B05D 1/04 - Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field

Abstract

An electrode for electric discharge surface treatment, in which a pulse-like electric discharge is caused between the electrode and a work in a dielectric fluid or an atmosphere, and in which a coat of an electrode material or a substance that is generated by a reaction of the electrode material due to an electric discharge energy is formed on a surface of the work, is a molded powder that is formed by molding a material powder including a metallic powder, a metallic compound powder, and a conductive ceramic powder. A powder solid that is formed as a result of coagulation of the material powder, and that is included in the molded powder has a diameter shorter than a distance between the electrode and the work.

IPC Classes  ?

• B23K 1/04 -

Abstract

3) and/or hexaboron nitride (hBN). An electrode formed by compression molding of the high-temperature hard material, and the high-temperature lubricating material containing at least one of Cr and hBN and having the lubricating property at the high temperature is used as the electrode for the electro-discharge surface treatment.

IPC Classes  ?

• H01T 14/00 - Spark gaps not provided for in groups
• C23C 26/02 - Coating not provided for in groups applying molten material to the substrate
• C23C 30/00 - Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
• B23K 9/18 - Submerged-arc welding
• B23K 9/04 - Welding for other purposes than joining, e.g. built-up welding
• C23C 26/00 - Coating not provided for in groups

Abstract

Installed on a top of a structure (1) is a base stand (11) against which damping body (3) movably rests via a linear guide mechanism (12). Mounted between the damping body (3) and the structure (1) or between the damping body (3) and a top of a support housing (14) erected on the structure (1) is a characteristic-frequency adjusting spring or springs (13) with an initial tension being applied vertically. Movement of the damping body (3) causes the spring or springs (13) to be obliquely and longitudinally expanded to apply horizontal component to the damping body (3) upon restoring.

IPC Classes  ?

• E04H 9/00 - Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate

Abstract

A three-gear type gear pump or double gear pump wherein the first driven gear and the second driven gear are opposed to one another with the driving gear disposed between them, wherein the number of teeth of the driving gear is greater than the number of teeth of each of the first driven gear and the second driven gear.

IPC Classes  ?

• F02C 7/22 - Fuel supply systems
• F04C 2/18 - Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with similar tooth forms

Abstract

A turbofan engine, comprising a fan 1-stage moving blade for taking in air and
a spinner rotatingly driving the fan 1-stage moving blade. The spinner
comprises a spiral vane spirally extending to the radial other side, sucking
air from the front of the spinner, and supplying it to the fan 1-stage moving
blade. Also, the fan 1-stage moving blade and the spinner are integrally
connected to each other, and the spiral vane and the fan 1-stage moving blade
are so formed that their surfaces can be smoothly joined to each other.

IPC Classes  ?

• F02C 7/04 - Air intakes for gas-turbine plants or jet-propulsion plants
• F02K 3/06 - Plants including a gas turbine driving a compressor or a ducted fan in which part of the working fluid by-passes the turbine and combustion chamber the plant including ducted fans, i.e. fans with high volume, low-pressure outputs, for augmenting jet thrust, e.g. of double-flow type with front fan
• F04D 29/32 - Rotors specially adapted for elastic fluids for axial-flow pumps
• F04D 29/38 - Blades

Abstract

An axial flow compressor is provided with a rotor blade raw (10) which is formed such that an outlet cross sectional area is larger than an inlet cross sectional area so as to reduce a speed in an axial direction and reduce a pressure difference between a positive pressure surface and a negative pressure surface. Further, a stator blade row (11) is provided in a downstream side of the rotor blade row (10). An output cross sectional area of the stator blade row (11) is structured such as to be smaller than an inlet cross sectional area of the rotor blade row (10).

IPC Classes  ?

• F01D 5/02 - Blade-carrying members, e.g. rotors
• F01D 5/20 - Specially-shaped blade tips to seal space between tips and stator
• F01D 11/00 - Preventing or minimising internal leakage of working fluid, e.g. between stages
• F01D 11/08 - Preventing or minimising internal leakage of working fluid, e.g. between stages for sealing space between rotor blade tips and stator
• F04D 29/38 - Blades

Abstract

A burner 1 for combustion chamber is provided with a cylindrical mixing
portion
3 that mixes air for combustion (oxidizing agent) and fuel in the interior
thereof and has
one end 3a that opens to a combustion portion 2; a spray nozzle (fuel spraying
portion) 5
that sprays fuel in the mixing portion 3, being disposed on another end 3b of
the mixing
portion 3; first blowing ports 6 that introduce the air for combustion to the
mixing

portion 3 to form a swirling flow with the fuel, being disposed to open to the
inner wall
of the mixing portion 3; and second blowing ports 7 that additionally
introduce the air for
combustion to the mixing portion 3, opening in a direction different from the
first
blowing ports 6 and being disposed further to the other end 3b side of the
mixing portion
3 than the swirling flow. The burner for combustion chamber and combustion
method
of the present invention can shorten the flame length in the central axial
direction by
improving the combustion efficiency even during low loading and shorten the
overall
length of the burner for combustion chamber in the central axial direction.

IPC Classes  ?

• F23D 11/24 - Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space by pressurisation of the fuel before a nozzle through which it is sprayed by a substantial pressure reduction into a space
• F23L 5/02 - Arrangements of fans or blowers
• F23L 7/00 - Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam