Abstract: An impeller includes: a disc having a disc shape; a plurality of blades formed on a surface facing a first side in an axial direction of the disc; and a cover surrounding the plurality of blades. The cover includes: an inner circumferential surface connected to the blades with a diameter decreasing from the second side toward a first side in the axial direction; and a distal end surface extending from an end portion of the inner circumferential surface on the first side in the axial direction toward the outside in a radial direction and facing the first side in the axial direction. A front edge portion extends from a boundary between the inner circumferential surface and the distal end surface toward the inside in the radial direction.

Abstract: The impeller is provided with a disk that rotates about an axis line, and a plurality of blades provided at intervals around the circumference of the disk. Defining the blade angle of the tip of each blade as a first blade angle, the tip has a constant-tip-angle area in which the first blade angle is constant from an inlet where fluid flows in toward an outlet side, and an increasing-tip-angle area that is continuous with the outlet side of the constant-tip-angle area and that has a gradually increasing first blade angle towards the outlet.

Abstract: The centrifugal compressor includes an impeller configured to feed a fluid suctioned from one side to an outside in a radial direction by rotating about an axis, and a flow path provided between the impellers adjacent to each other in the direction of an axis and configured to guide the fluid discharged from an impeller on the upstream side to an impeller on the downstream side. The flow path includes a diffuser flow path, a return bend portion, and a guide flow path. Further, the centrifugal compressor further includes return vanes extending across the return bend portion and the guide flow path in the flow path and provided in intervals in a circumferential direction, and the radial positions of the leading edges of the return vanes in the flow paths adjacent in the direction of the axis are different from each other.

Abstract: A centrifugal compression test device includes a flow path forming section and an inlet space forming section. The flow path forming section forms an introduction flow path, an inlet flow path, and an interstage inflow path. The introduction flow path guides a fluid from the outside toward the inside in the radial direction. The inlet flow path is connected to the introduction flow path. The interstage inflow path extends from the outside toward the inside in the radial direction and is connected to the inlet flow path. The inlet space forming section is formed an annular shape having an introduction opening section through which a fluid is introduced from a part in the circumferential direction and the outside in the radial direction at the first side of the introduction flow path. Further, a front end of the introduction flow path is connected to the inlet space forming section.

Abstract: The present invention relates to a chemically strengthened glass having a first principal surface and a second principal surface facing the first principal surface, at least a portion of the first principal surface being chemically strengthened, wherein the depth of a compressive stress layer in at least a portion of the first principal surface continuously changes. This chemically strengthened glass can be suitably used in an application in which chemical strengthening characteristics that differ among different regions in the same plane are desired in a chemically strengthened glass.

Abstract: A centrifugal compressor, in which a plurality of impellers that rotate along with a rotation shaft to pump fluid by using centrifugal force are disposed at a plurality of stages along an axial direction to compress, in a stepwise manner, the fluid sucked in from a suction port, the centrifugal compressor including: a closed impeller including a plurality of vanes disposed in a radial manner about the rotation shaft, and a shroud covering the plurality of vanes from radially outside; and an open impeller including a second plurality of vanes without a shroud. The closed impeller is disposed at a rearmost stage in a fluid flow direction. The open impeller is disposed at a stage located immediately after the suction port in the fluid flow direction.

Abstract: A multistage centrifugal compressor includes a rotating shaft; a first impeller and a second impeller fixed to the rotating shaft; and a casing configured to surround the rotating shaft and the first and second impellers, that forms a first diffuser channel allowing the flowing through of a fluid which is discharged from the first impeller, that forms a first return channel, that forms a second diffuser channel allowing the flowing through of the fluid which is discharged from the second impeller, that forms a second return channel, wherein the first impeller is disposed adjacent to the second impeller in the axial direction of the rotating shaft, in the first diffuser channel, a vaneless diffuser is disposed, and in the second diffuser channel, a vaned diffuser having multiple vanes is disposed.

Abstract: A sealing body of a battery includes a positive electrode cap, a safety valve electrically connected to the positive electrode cap, a plurality of protrusions that are disposed annularly and intermittently on the outer peripheral side of a conductive contact part of the safety valve and that are each formed so as to be inclined toward the center of the sealing body, and an insulating member that covers at least top parts of the plurality of protrusions, side surfaces thereof on the center side, and a surface of the safety valve on the center side, that is fitted to the center side of the plurality of protrusions, whose vertical sectional shape is bent in a Z-shape. A terminal plate is fitted and fixed to the center side of the insulating member and is connected by welding to the conductive contact portion through a central opening of the insulating member.

Abstract: A cylindrical battery according to one aspect of the present invention includes an electrode body in which a negative electrode plate and a positive electrode plate to which a plurality of positive electrode leads is connected are wound with a separator interposed therebetween; an electrolyte liquid; a cylindrical outer can having a bottom portion which receives the electrode body and the electrolyte liquid; and a sealing body sealing an open portion of the outer can. The positive electrode leads extend along an outer circumference portion of a collector member disposed on the electrode body and are connected to a surface of the collector ember at an outer side of the battery. The collector member includes a collector plate to which the positive electrode leads are connected and a first insulating plate fitted to a surface of the collector plate at an inner side of the battery.

Abstract: An optical device includes a base material including a surface on which multiple concaves are formed. The concaves include respective curved surfaces. The concaves are formed so that the bottoms of the concaves are at two or more different positions in a depth direction. In the optical device, 2/7?|(n1?n2)×?d|/??10 holds, where n1 is the refractive index of the base material, n2 is the refractive index of a medium around the concaves, ? is the wavelength of a beam flux that enters the base material, and ?d is a range of the positions of the bottoms in the depth direction.

Abstract: A sealed battery of the invention includes a bottomed cylindrical housing accommodating an electrode assembly and an electrolytic solution, and a sealing unit fixed by crimping of an open end of the housing, the sealing unit including at least a valve body, a terminal plate welded to a central portion of the valve body so as to be farther inside the battery than the valve body, and an annular insulating member disposed between outer peripheral portions of the valve body and of the terminal plate, the terminal plate having a welded portion formed as a fusion mark during welding with the valve body, the terminal plate having a thin portion disposed around the welded portion, the distance from the outermost edge of the welded portion to the thinnest part of the thin portion being not more than 1 mm.

Abstract: A glass sheet is a single glass sheet having a first surface and a second surface facing the first surface. The glass sheet has a curvature part curved in a first direction and a second direction orthogonal to the first direction. A radius of curvature in the first direction of the curvature part is 8,500 mm or less. At least a part of the first surface has been chemically strengthened in the curvature part. In the first direction within the chemically strengthened region in the curvature part, an Na amount in the first surface is smaller than the Na amount in the second surface.

Abstract: A cylindrical battery including an electrode body in which a negative electrode plate and a positive electrode plate to which a plurality of positive electrode leads is connected are wound with a separator interposed therebetween; an upper insulating plate disposed on the electrode body; a positive electrode current collector plate disposed on the upper insulating plate; a sealing body; and an outer can. A first positive electrode lead extends between the upper insulating plate and the current collector plate after passing through a through-hole of the upper insulating plate and is bent onto the current collector plate at an outer circumference portion thereof, and a second positive electrode lead extends along the outside of an outer circumference portion of the upper insulating plate and is bent onto the current collector plate at the outer circumference portion thereof. Those positive electrode leads are all connected to the current collector plate.