129results about How to "Suppress turbulence" patented technology

A control circuit of a power conversion device calculates voltage command signals for determining timings for making switching elements of a power switching circuit continuous by performing feed forward control on the basis of input information, and feedback control on the basis of the input information and current values of AC output, for each of the d axis and the q axis of a motor.

A cap film is formed over semiconductor films formed over an insulating substrate; the semiconductor films are irradiated with a laser beam which is capable of completely melting the semiconductor film in a film-thickness direction to completely melt the semiconductor film. By controlling the laser beam, a crystalline semiconductor films are formed over the substrate, in each of which orientations of crystal planes are controlled. In addition, an n-channel thin film transistor is formed using a crystalline region in which crystal planes are oriented along {001} and a p-channel thin film transistor is formed using a crystalline region in which crystal planes are oriented along {211} or {101}.

In cases where a radio communication is performed between a ground radio base station and a subscriber station, when a delay time J passes after the transmission of a radio wave from the ground radio base station to a stratospheric platform base station, another radio wave relating to the same information as that indicated by the radio wave is transmitted from the ground radio base station to the subscriber station. Therefore, in the subscriber station, a phase of the radio wave directly transmitted from the ground radio base station is synchronized with a phase of the radio wave transmitted from the ground radio base station through the stratospheric platform base station. Accordingly, the subscriber station can change over from one radio wave, of which the strength is weakened, to another radio wave.

A first shroud and a second shroud are opposed to the peripheral end surface of a recording disk at a certain constant distance. The second shroud is spaced downstream from the first shroud in the direction of the rotation of the recording disk. A shroud plate is opposed to the peripheral end surface of the recording disk at a position between the first and second shrouds. The shroud plate functions as a shroud. The shroud plate serves to suppress turbulence of airflow. Vibration of the recording disk can be suppressed. Moreover, if the shroud plate is designed to extend along a virtual plane perpendicular to the rotation axis of the recording disk, the airflow is prevented from staying between the first and second shrouds. The airflow can effectively be taken out. The airflow can effectively be utilized.

The present invention relates to a silenced blowing nozzle for blowing of a static gas medium under overpressure, in particular air, having in a central part (6) of the nozzle at least one first discharge opening (11) embodied to generate a core stream of gas with supersonic velocity. The central part is surrounded by a more peripheral part (5) containing a number of second discharge openings (13) spaced from each other and from said first discharge opening(s), the said second discharge openings being embodied to generate a gas flow with lower velocity than the core stream, preferably a velocity equal to sonic velocity, which gas flow surrounds the core stream and has the same direction as said core stream.

A stator blade ring is provided with which the possibilities of thermal deformation and a decrease in strength can be reduced, the shape flexibility can be ensured, and the compression performance can be improved. It includes stator blade segments (21) in each of which an inner shroud portion (31) and an outer shroud portion (29) divided corresponding to one stator blade (27) are provided at both ends of the stator blade (27) so as to be formed as a single part, and connecting members (23) that are formed of arch-shaped plates and are disposed on at least one of the inner shroud portions (31) and the outer shroud portions (29) of the stator blade segments (21) adjoining in a circumferential direction, on a side opposite to the stator blades (27). The stator blade segments (21) are welded to the connecting members (23) at a portion of the length thereof in the circumferential direction.

A hard disk drive (HDD) and method, with the HDD including a housing, having a base member and a cover member attached to each other, a plurality of disks, rotatably stacked on the base member and spaced apart from one another, an actuator installed on the base member to rotate around a pivot and fixedly supporting, on its leading end, a slider on which a magnetic head for recording or reproducing data to or from the disks is mounted, and a damper, disposed between the stacked disks, wherein a groove is formed on surfaces of the damper facing the disks.

A mower capable of reducing noise generated by rotation of a cutter blade is provided. A mower is provided with an upper cutter blade and a lower cutter blade (15) inside a housing. The lower cutter blade has a wing portion (42) and a wing chamfered portion (51). The wing portion overhangs upward from a second rear end portion (47) of the lower cutter blade on an opposite side in a rotational direction, at both end portions (45) in a longitudinal direction. The wing chamfered portion is chamfered so that a wing outer end portion (53) of the wing portion is inclined from an upper surface to a lower surface.

A hard disk drive (HDD) and method, with the HDD including a housing, having a base member and a cover member attached to each other, a plurality of disks, rotatably stacked on the base member and spaced apart from one another, an actuator installed on the base member to rotate around a pivot and fixedly supporting, on its leading end, a slider on which a magnetic head for recording or reproducing data to or from the disks is mounted, and a damper, disposed between the stacked disks, wherein a groove is formed on surfaces of the damper facing the disks.

A TSL lance has an outer shell of three substantially concentric lance pipes, at least one further lance pipe concentrically within the shell, and an annular end wall at an outlet end of the lance which joins ends of outermost and innermost lance pipes of the shell at an outlet end of the lance and is spaced from an outlet end of the intermediate lance pipe of the shell. Coolant fluid is able to be circulated through the shell, by flow to and away from the outlet end. The spacing between the end wall and the outlet end of the intermediate pipe provides a constriction to the flow of coolant fluid to increase coolant fluid flow velocity therebetween. The further lance pipe defines a central bore and is spaced from the innermost lance pipe of the shell to define an annular passage, whereby materials passing along the bore and the passage mix adjacent to the outlet end of the lance. The end wall and an adjacent minor part of the length of the shell comprise a replaceable lance tip assembly.

An impeller is provided. A recessed part (air flow direction changing means) 8b is provided on the side of a pressure surface 5 of the blade 8, and a protruded part 8a (air flow adhering means) is provided at a trailing edge part of the blade 8. An air flow passing the impeller 9 is converted into an axial direction by the recessed part 8b and separation of the negative surface side air flow is restricted by the protruded part 8a. Turbulence when the air flow on the negative surface side is confluent with the air flow on the pressure surface side can thus be restricted, thereby deterioration of blowing performance of the impeller and increase of blowing noise can be restricted.

First and second shroud surfaces are defined along an imaginary cylinder coaxial to a recording disk. A shroud plate is located between the first and second shroud surfaces. Airflow flows outward along the surface of the rotating recording disk based on the centrifugal force. The shroud plate serves to establish the continuity of the first and second shroud surfaces. The first and second shroud surfaces and the shroud plate serve to reliably suppress turbulence of the airflow. Vibration of the recording disk is suppressed than ever. An inflow opening is located in a space between the first and second shroud surfaces. The rectifier plate is located downstream of the inflow opening. The rectifier plate serves to direct the airflow flowing along the first shroud surface to the inflow opening. A larger amount of airflow can be introduced into the inflow opening. A dust catcher receives airflow of a sufficient amount.

A flexible tube 10 of the present invention is disposed downstream of a exhaust path from an engine E, and formed of an outer bellows 3 as an outer tube and an inner bellows 4 as an inner tube; pleats 4c,4c of the inner bellows 4 are smaller in depth and pitch than the pleats 3c of the outer bellows 3, and the buffering space S is provided with a gap t between the pleats bottoms of the outer bellows 3 and the pleats tops of the inner bellows 4, and further, a partition 17 that splits the exhaust path is disposed in the inner bellows 4. For this reason, sound insulation effect is improved, and the lowering of the temperature of the exhaust gas is suppressed, leading to quick temperature rise of the exhaust gas to be fed into the catalytic converter, thereby promoting the activation of the catalysts and improving the capability to purify exhaust gas, and the exhaust efficiency can be improved thereby increasing output performance of the engine.

A flow sensor 22 is provided on a wall surface of a flow path 4 in which a fluid to be measured. A member having minimal cross-section flow path 17 which has a diameter extremely smaller than that of the flow path 4 where the flow sensor 22 is provided is disposed at the downstream of the flow sensor 22.

A sliding door device includes a frame case that includes an opening through which an air flow passes, a slide door that is moved relative to the opening to adjust an aperture ratio of the opening, a shaft that is disposed at an upstream side of the slide door when viewed along the flowing direction of the air flow, and moves the slide door, and a windbreak member that blocks a gap between the shaft and the slide door.

An object is to provide a fuel supply apparatus that is configured to cause fuel vapor generated by vaporization of a fuel circulated in a fuel tank to be smoothly joined with the supplied fuel. The fuel supply apparatus comprises a filler neck body that is configured to include a hollow fuel passage-forming portion arranged to define a fuel passage and a breather port; a nozzle guide that is placed inside of the fuel passage-forming portion and is configured to introduce a fueling nozzle; a guide portion that is configured to introduce an inflow gas flowing in from the breather port, to the fuel passage via an outer circumferential space; and a rib that is provided between the guide portion and a lower end in the first direction of the nozzle guide and is configured to divide the inflow gas introduced through the fuel passage.

The invention discloses a multi-baffle type oil-and-water separator. The separator comprises a tank body, a first baffle, a second baffle and an oblique baffle, wherein the interior space of the tank body is divided into a subcritical flow defoaming area, a settling separation area and a water collection area by the first baffle and the second baffle; a feed port is formed in the subcritical flow defoaming area; a subcritical flow defoaming structure is arranged below the feed port; an air outlet is formed in the settling separation area; a bottom plate is arranged at the bottom of the first battle; a separation plate is arranged at the end part of the bottom plate; clearances are respectively reserved between the first baffle and the bottom surface of the tank body, the second baffle and the top surface of the tank body, the second baffle and the bottom surface of the tank body, the separation plate and the second baffle, the separation plate and the top of the tank body, and the oblique baffle and the second baffle; the space defined by the bottom plate, the separation plate, the first baffle and the tank body forms an oil collecting tank; an oil outlet is formed in the oil collecting tank; a water outlet and a discharge port are both formed at the upper part inside the water collecting area; the discharge port is higher than the water outlet; a sewage draining port is formed in the lower part of the water collecting area. The oil-and-water separator is simple in structure and low in operation cost, can effectively restrain emulsion and realize continuous oil-and-water separation and is high in separation efficiency and good in separation effect.

An exhaust system for a steam turbine provided with an improved annular flow guide in a high or intermediate turbine. The improved flow guide reduces flow turbulence in an exhaust hood and reduces pressure loss to thereby improve turbine plant efficiency.The shape (vertically symmetric) of a flow guide 5A according to a conventional technology was modified into the shape (vertically asymmetric) of a flow guide 5 such that the length of a downstream flow guide portion 5d is greater than that of a upstream flow guide portion 5u. Numerical analyses were performed to find the optimum flow guide occupation ratio of the conventional technology and the corresponding total pressure loss coefficient. The obtained values were used as reference values. Further, the flow guide occupation ratio of the upstream flow guide portion 5u was set at 0.4 and the flow guide occupation ratio of the downstream flow guide portion 5d was set at 0.7; at values where the total pressure loss coefficient becomes lower than the reference value. The rectification effect of the flow guide can thus be enhanced.

An energy exchange chamber is used for exchanging pressure energy between concentrated seawater discharged from a reverse-osmosis membrane-separation apparatus and a part of seawater to be treated by the reverse-osmosis membrane separation apparatus in a seawater desalination system. The energy exchange chamber includes a concentrated seawater distributor communicating with a concentrated seawater port and configured to distribute a flow of concentrated seawater all over a horizontal plane of an interior of a chamber, and a seawater distributor communicating with a seawater port and configured to distribute a flow of seawater all over the horizontal plane of the interior of the chamber. The concentrated seawater and the seawater introduced into the chamber are brought into direct contact with each other over the horizontal plane of the interior of the chamber to exchange pressure energy between the concentrated seawater and the seawater introduced into the chamber.

Provided is an axial flow blower wherein noise is reduced by ensuring the effective work of blades and suppressing the blade tip vortex. The axial flow blower is formed so that a chord center line (37) extending so as to connect chord center points (34) from the inner peripheral end to the outer peripheral end of a blade (3), is curved and projected toward the downstream side in the entire region.

Provided is a BOAF treating method for purifying the water landscape, water system and water quality in the sealed small social region and the apparatus thereof. The method substitutes a drug feeding system necessary for all of the gas flotation apparatus by a biological reacting pool, mixes the original water in the water landscape and water system in the sealed small social region with the active bio-floculation from the BOAF pool. A mixed liquid flow formed by depositing in the biochemical reacting pool for a certain period is flowing into the BOAF pool for a treatment. The water output from the BOAF pool is returned to the water landscape and water system after sterilizing by the ultraviolet sterilizer. The mixing liquid flowing into the BOAF pool obtains a separation of the water output and the active bio-floculation by the means of gas flotation. The active bio-floculation returns to the front end of the biochemical reacting pool and continues to mix with the original water for a recycle reaction. A small part of water output forms the gas dissolving water and returns to the BOAF pool to provide slight bubbles for the bio-floculation separation. The system apparatus ensures a qualified landscape water and keeps a water environment balance in the water system in the sealed small social region.

Provided is an air table for conveying a thin material and a conveyance device for a thin material capable of obtaining large amount of levitation of the thin material while suppressing turbulence of air in a clean room and having high reliability. This air table (14) for conveying the thin material has: an external wall part (20) whose upper face part (16) is a substantially flat box-like body and in which a plurality of air feeding holes (18) for supplying air to a lower face of a glass substrate (12) are formed in the upper face part (16); a bulkhead part (28) provided in the external wall part (20) so as to separate an inner side of the external wall part (20) from a lower side chamber (22) for introducing air into the external wall part (20) and an upper side chamber (24) adjacent to the air feeding holes (18) and forming a plurality of intermediate vent holes (26) passing through in the vertical direction; and an air stream uniformly distributing damper (30) provided in the upper side chamber (24) to achieve uniform distribution of air stream from the intermediate vent holes (26) into the air feeding holes 18 and damp velocity of air stream.