Abstract: A centrifugal compressor 200 used in a gas pipeline 1 has a centrifugal impeller provided with a hub and a plurality of blades. The blade angle distribution of the blade is configured such that a hub side blade angle is maximum on the side closer to a hub side leading edge than a central point of a hub side camber line, and from this part to the hub side leading edge, a hub side blade angle distribution curve is convex in a blade angle increasing direction.

Abstract: An impeller includes a hub plate and a plurality of blades circumferentially disposed at intervals on one surface side of the hub plate. Each blade has a shape formed by piling up a plurality of blade sections in a blade height-wise direction of each blade in a reference impeller in which the hub plate intersects with the blades and which includes a linear element blade in the blade height-wise direction so as to form a curvilinear element blade. In piling up the blade sections, amounts of tangential lean and sweep to be applied to the blade sections are increased as it goes from an end face of at least one of a hub plate side end and a counter hub plate side end toward a span intermediate part of the blade.

Abstract: Provided is a whole integrated analysis model creation assist device and a whole integrated analysis model creation assist method such that an analysis model can be easily constructed and the construction time of the analysis model can be effectively reduced. Via a connection identifier associating boundaries for data exchange between an analysis model created with respect to one analysis domain and an analysis model created with respect to another analysis domain, at least one analysis model created with respect to the one analysis domain and a plurality of analysis models created with respect to the other analysis domain are connected and integrated.

Abstract: In semiconductor surface inspection apparatus, foreign matter that sticks to the wafer can reduce the quality of the wafer. The present invention is directed to improving the internal cleanliness of the apparatus. Specifically, during rotation of a semiconductor wafer, foreign matter suspended in an atmosphere surrounding the wafer is attracted to a central section of the wafer, and that while heading from the central section of the wafer, towards an outer edge thereof, the foreign matter is most likely to stick to the wafer. In conventional techniques, sufficient consideration is not given to such likelihood of foreign matter sticking. This invention supplies a medium from two directions to an inner circumferential section of a substrate. In accordance with the invention, foreign matter that sticks to a wafer can be reduced more significantly than in the conventional techniques.

Abstract: A plurality of vaned diffusers is disposed on a concentric plate at intervals in a circumferential direction thereof, and each of the diffusers is a curvilinear element three-dimensional diffuser having blades which are extended from a hub side of a impeller to a shroud side thereof. The blades are formed in a form in which a blade serving as a reference is stacked in a direction of the height of the blade, which is a direction of a gap between the hub and the shroud. A dihedral distribution in which moving in a direction perpendicular to a chord direction linking a leading edge of the blade as the reference with a tailing edge thereof, is set as a positive movement is non-uniform from an end portion on the hub side to an intermediate portion of the height of the blade.

Abstract: In semiconductor surface inspection apparatus, foreign matter that sticks to the wafer can reduce the quality of the wafer. The present invention is directed to improving the internal cleanliness of the apparatus. Specifically, during rotation of a semiconductor wafer, foreign matter suspended in an atmosphere surrounding the wafer is attracted to a central section of the wafer, and that while heading from the central section of the wafer, towards an outer edge thereof, the foreign matter is most likely to stick to the wafer. In conventional techniques, sufficient consideration is not given to such likelihood of foreign matter sticking This invention supplies a medium from two directions to an inner circumferential section of a substrate. In accordance with the invention, foreign matter that sticks to a wafer can be reduced more significantly than in the conventional techniques.

Abstract: A multi-stage impeller is configured in a multi-stage centrifugal compressor by fixing and attaching a plurality of centrifugal impellers to one rotating shaft. Diffusers and return channels are provided in order downstream from each impeller. The centrifugal impellers, the diffusers and the return channel are housed within a compressor casing. The return channels have a plurality of vanes positioned at intervals from one another in a circumferential direction, and at least two stages are provided. The vane exit angles monotonically increase toward the downstream stage.

Abstract: An impeller includes a hub plate and a plurality of blades circumferentially disposed at intervals on one surface side of the hub plate. Each blade has a shape formed by piling up a plurality of blade sections in a blade height-wise direction of each blade in a reference impeller in which the hub plate intersects with the blades and which includes a linear element blade in the blade height-wise direction so as to form a curvilinear element blade. In piling up the blade sections, amounts of tangential lean and sweep to be applied to the blade sections are increased as it goes from an end face of at least one of a hub plate side end and a counter hub plate side end toward a span intermediate part of the blade.

Abstract: An axial flow fan of high efficiency and low noise level is provided. The fan includes a motor, an impeller having a plurality of blades around a hub fitted to the motor, and a fan casing having an air inlet on one side and an air outlet on the other, wherein a radial position with a maximum setting angle in a blade section, and a radial position with a contour of a leading edge portion in a fluid flowing direction forming a projecting apex in the flowing direction are located between 60% and 80% of the outside diameter of the impeller.

Abstract: An axial flow fan of high efficiency and low noise level is provided. The fan includes a motor, an impeller having a plurality of blades around a hub fitted to the motor, and a fan casing having an air inlet on one side and an air outlet on the other, wherein a radial position with a maximum setting angle in a blade section, and a radial position with a contour of a leading edge portion in a fluid flowing direction forming a projecting apex in the flowing direction are located between 60% and 80% of the outside diameter of the impeller.

Abstract: A vacuum cleaner includes a vacuum cleaner body in which a rotating brush, a dust collecting unit and an electric blower unit are integrally attached to a suction opening casing in which a brush chamber is formed. A rodlike handle is connected to the vacuum cleaner body. The rodlike handle is formed by a hollow member, and a plurality of batteries are arranged in series in the hollow member and are covered with a heat contraction tube.