Abstract: A blower includes an impeller rotatable about a central axis, a motor that drives the impeller, and a housing that accommodates the impeller and the motor. The impeller includes a plurality of vanes arrayed in a circumferential direction and a flange in which the plurality of vanes are provided at an outer circumferential edge on a radially outer side. The housing includes a first housing that faces a vane lower end surface located on an axial-direction lower side of the vane with a gap interposed therebetween. The vane lower end surface includes a first vane end surface in which a shortest distance to the first housing in an axial direction increases toward the radially outer side.

Abstract: The blowing device includes an impeller that is rotatable about a center axis and a motor that drives the impeller. The impeller includes a plurality of vanes arranged in a circumferential direction, a flange in which the plurality of vanes are provided at the outer circumferential edge in a radial-direction outside, and a plate-shaped first shielding unit located between the vanes adjacent to each other in the circumferential direction. The first shielding unit is connected to a rear edge surface on an opposite side to the rotation direction of the vane and an outside surface located on the radial-direction outside of the flange.

Abstract: A centrifugal fan includes a motor, an impeller that rotates together with a rotating portion of the motor, and a housing that houses the motor and the impeller. The housing includes a cover extending perpendicularly to the center axis on the upper side of the impeller, a base extending perpendicularly to the center axis on the lower side of the impeller, a side wall connecting the cover and the base in the axial direction on the radially outer side of the impeller and defining an air blowing port together with the cover and the base in a portion of the circumferential direction, and an air inlet penetrating in the axial direction on the radially inner side of a radially outer end portion of the impeller. At least one of the base and the cover includes at least one hole penetrating in the axial direction on the radially outer side of the radially outer end portion of the impeller, and a seal that seals the hole.

Abstract: A centrifugal fan includes a motor, an impeller, and a housing. The motor includes a rotary portion that rotates about a vertical center axis. The impeller is fixed to and rotates together with the rotary portion. The housing accommodates the motor and impeller. The rotary portion includes a rotor holder with a magnet. The impeller includes circumferentially disposed blades and a blade support. The blade support supports the blades on an outer side. The housing includes an inlet port axially penetrating an upper surface and an outlet port radially penetrating a side surface. At least a portion of an inner surface of the blade support radially faces an outer surface of the rotor holder with a gap therebetween containing adhesive at least partially. At least one of the outer surface of the rotor holder and the inner surface of the blade support includes a radially recessed portion containing adhesive.

Abstract: A centrifugal fan includes a motor, an impeller, and a housing. The motor includes a rotary portion that rotates about a vertical center axis. The impeller is fixed to and rotates together with the rotary portion. The housing accommodates the motor and impeller. The rotary portion includes a rotor holder with a magnet. The impeller includes circumferentially disposed blades and a blade support portion that supports the blades on an outer side. The housing includes an inlet port axially penetrating an upper surface of the housing and an outlet port radially penetrating a side surface of the housing. The blade support portion includes an accommodating portion that opens upward and that accommodates a balance adjustment member. The accommodating portion is disposed on a radial-direction inner side of the blades and between an upper end and a lower end of the blades in an axial direction.

Abstract: A blower apparatus includes an impeller arranged to be capable of rotating about a central axis extending in a vertical direction, and a motor arranged to drive the impeller. The impeller includes a plurality of blade portions arranged in a circumferential direction, and a flange portion arranged to have the blade portions arranged on an outer peripheral portion thereof on a radially outer side. At least one of the blade portions includes a shoulder portion at an end portion thereof on a radially inner side and on one axial side. The shoulder portion includes a first end surface arranged to face to the one axial side, a second end surface arranged to face to the one axial side and arranged on another axial side of the first end surface, and a third end surface arranged to join an inner end portion of the first end surface on the radially inner side and an outer end portion of the second end surface on the radially outer side to each other.

Abstract: A blower apparatus includes an impeller arranged to be capable of rotating about a central axis extending in a vertical direction, and a motor arranged to drive the impeller. The impeller includes a plurality of blade portions arranged in a circumferential direction, and a flange portion arranged to have the plurality of blade portions arranged on an outer peripheral portion thereof on a radially outer side. Each blade portion includes a trailing edge surface arranged on a rearward side of the blade portion with respect to a rotation direction of the impeller in the circumferential direction, and a leading edge surface arranged on a forward side of the blade portion with respect to the rotation direction in the circumferential direction. The trailing edge surface includes at least one recessed portion recessed forward with respect to the rotation direction.

Abstract: A blower includes an impeller that is rotatable about a vertically extending central axis; a motor that drives the impeller; and a housing that accommodates the impeller and the motor. The impeller includes a plurality of vanes and a flange in which the plurality of vanes are provided. The housing includes a first housing unit that faces a vane one end surface located on an axial-direction one side of the vane with a gap interposed therebetween. The first housing unit includes an inlet port penetrating in the axial direction. One end surface of the flange located on one side in the axial direction of the flange includes a first flange end surface located on an inside in the radial direction of one end surface of the flange and a second flange located on an outside in the radial direction with respect to the first flange end surface.

Abstract: A blower includes an impeller rotatable about a central axis, a motor that drives the impeller, and a housing that accommodates the impeller and the motor. The impeller includes a plurality of vanes arrayed in a circumferential direction and a flange in which the plurality of vanes are provided at an outer circumferential edge on a radial-direction outside. The housing includes a first housing that faces a vane one end surface located on an axial-direction one side of the vane with a gap interposed therebetween. The vane one end surface includes a first vane end surface in which a shortest distance to the first housing in an axial direction increases toward the radial-direction outside.

Abstract: The blowing device includes an impeller that is rotatable about a center axis and a motor that drives the impeller. The impeller includes a plurality of vanes arranged in a circumferential direction, a flange in which the plurality of vanes are provided at the outer circumferential edge in a radial-direction outside, and a plate-shaped first shielding unit located between the vanes adjacent to each other in the circumferential direction. The first shielding unit is connected to a rear edge surface on an opposite side to the rotation direction of the vane and an outside surface located on the radial-direction outside of the flange.

Abstract: A porous oil-impregnated sleeve is used for a fluid dynamic pressure bearing. The sleeve includes an inner surface, a first axial end face, a first recessed portion, and a first dynamic pressure generating groove. The first recessed portion is positioned on the other side of a line segment, which connects one-side end portion of the inner surface with an inner end portion of the first axial end face, in a cross-section including the central axis. A bottom portion of the first recessed portion, which has the longest distance between itself and the line segment, is positioned closer to the other side than a bottom portion of the first dynamic pressure generating groove in the axial direction.

Abstract: A first seal portion having a surface of a lubricating oil defined therein is defined between a sleeve portion and a bearing housing. A side communicating channel arranged to bring a first seal gap and a thrust gap into communication with each other is defined either between a sleeve portion and a bearing housing or in an outer circumferential portion of a sleeve portion. A second seal portion having another surface of a lubricating oil defined therein is defined in a gap constituted by a side minute gap between a thrust plate and a bearing housing and a lower minute gap between a thrust plate and a cap member.

Abstract: A porous oil-impregnated sleeve is used for a fluid dynamic pressure bearing. The sleeve includes an inner surface, a first axial end face, a first recessed portion, and a first dynamic pressure generating groove. The first recessed portion is positioned on the other side of a line segment, which connects one-side end portion of the inner surface with an inner end portion of the first axial end face, in a cross-section including the central axis. A bottom portion of the first recessed portion, which has the longest distance between itself and the line segment, is positioned closer to the other side than a bottom portion of the first dynamic pressure generating groove in the axial direction.

Abstract: A centrifugal fan includes an impeller arranged to rotate about a rotation axis, a motor arranged to rotate the impeller, and a case arranged to accommodate the impeller and the motor. The case includes an upper case, a lower case, and a joint portion at which the upper and lower cases are fixed to each other. An interior of the case includes a first annular space positioned radially outward of the motor. The first annular space includes a second annular space defined by a portion of a space defined by an annularly continuous collection of imaginary circles each of whose diameter is the shortest distance between an inner circumferential edge of the joint portion and a radially outermost circumferential portion of a motor accommodating portion and each of which touches the inner circumferential edge of the joint portion.

Abstract: In a motor, a bearing housing is made of a thermoplastic resin material. A bottom portion of the bearing housing includes a first large diameter portion, a small diameter portion, and a second large diameter portion. The first large diameter portion of the bearing housing is arranged on an upper surface of the base. An outer circumferential surface of the small diameter portion of the bearing housing is arranged radially opposite a side peripheral surface of a base hole. The second large diameter portion is arranged to be in direct contact with a lower surface of the base through caulking.

Abstract: A fan includes blades and a motor. The motor includes a rotor holder; a shaft; a sleeve; a holder; and a thrust plate. A radial bearing portion arranged to support the shaft in a radial direction is defined in a radial gap defined between the shaft and the sleeve. A lower seal portion having a lower surface of a lubricating oil defined therein is defined between the thrust plate and the holder, while an upper seal portion having an upper surface of the lubricating oil defined therein is defined between the holder and the sleeve. The holder includes a connection channel defining portion arranged to define a connection channel to connect an upper space defined between the upper seal portion and an inside of the rotor holder with a lower space at which the lower seal portion is arranged.

Abstract: A first seal portion having a surface of a lubricating oil defined therein is defined between a sleeve portion and a bearing housing. A side communicating channel arranged to bring a first seal gap and a thrust gap into communication with each other is defined either between a sleeve portion and a bearing housing or in an outer circumferential portion of a sleeve portion. A second seal portion having another surface of a lubricating oil defined therein is defined in a gap constituted by a side minute gap between a thrust plate and a bearing housing and a lower minute gap between a thrust plate and a cap member.

Abstract: A centrifugal fan includes a housing including a base, a side wall portion having an air outlet defined therein, and a cover arranged above the side wall portion and having an air inlet defined therein. A circuit board is arranged on an upper surface of the base, and includes a circuit board protruding portion arranged to protrude radially outward of the housing. At least one of electronic components to be mounted on the circuit board is arranged radially outward from an inner circumferential surface of the side wall portion.

Abstract: An electric motor includes a stator portion, a rotor portion, and a bearing mechanism, wherein the rotor portion includes a rotor holder having a substantially cylindrical shape with a closed end, and a field magnet fixed to an inner circumference of the rotor holder; the stator portion includes a stator, a base portion to which the stator is fixed, and a magnetic member; and the magnetic member includes a cylindrical portion having a substantially cylindrical shape into which a lower end portion of an insulator of the stator is inserted, the lower end portion being a portion of an outer portion of the insulator and opposing the base portion, and a flat portion having a substantially annular shape which spreads outwardly in a radial direction from a lower edge of the cylindrical portion and opposes a lower edge of the field magnet.

Abstract: In a motor, a bearing housing is made of a thermoplastic resin material. A bottom portion of the bearing housing includes a first large diameter portion, a small diameter portion, and a second large diameter portion. The first large diameter portion of the bearing housing is arranged on an upper surface of the base. An outer circumferential surface of the small diameter portion of the bearing housing is arranged radially opposite a side peripheral surface of a base hole. The second large diameter portion is arranged to be in direct contact with a lower surface of the base through caulking.