Abstract: A serial axial flow fan includes a first axial flow fan, a second axial flow fan, and a current plate. Hollow cells of the current plate are partitioned by a lattice-shaped partition, penetrate in an axial direction, and are uniformly two-dimensionally arranged at an outer edge. An axially lower end portion of a first housing of the first axial flow fan and an axially upper end portion of a second housing are directly coupled to each other, and the current plate is provided in a coupling unit of the first housing and the second housing. An axially lower end portion of the first tubular unit of the first housing is axially opposed to an axially upper end portion of the second tubular unit of the second housing with the current plate interposed therebetween. A recess recessed on an opposite side to the coupling unit in the axial direction is provided on an axially end surface of at least one of an axially lower end surface of the first tubular unit and an axially upper end surface of the second tubular unit.

Abstract: A serial axial flow fan in which an end portion of a first axial flow fan on an exhaust side, and an end portion of a second axial flow fan on an intake side are connected to each other. At least either of a plurality of first blades of a first impeller of the first axial flow fan, and a plurality of second blades of a second impeller of the second axial flow fan are provided with auxiliary blade portions.

Abstract: A fan motor includes a motor, an impeller and a housing. The housing includes an inner wall portion, a silencer portion, and a communicating opening. The inner wall portion extends along a rotation axis to assume a tubular shape, and houses at least a portion of the impeller therein. The silencer portion includes a portion radially outside of the inner wall portion, and defines a silencing space between the inner wall portion and the silencer portion. The communicating opening brings a space inside of the inner wall portion into communication with the silencing space. A portion of the communicating opening is defined by an end portion of the inner wall portion on an inlet side. The silencing space covers only a portion of the circumferential extent of the inner wall portion. This allows the silencing space to be arranged in a dead space around the inner wall portion.

Abstract: A serial axial flow fan includes a first axial flow fan, a second axial flow fan, and a current plate. Hollow cells of the current plate are partitioned by a lattice-shaped partition, penetrate in an axial direction, and are uniformly two-dimensionally arranged at an outer edge. An axially lower end portion of a first housing of the first axial flow fan and an axially upper end portion of a second housing are directly coupled to each other, and the current plate is provided in a coupling unit of the first housing and the second housing. An axially lower end portion of the first tubular unit of the first housing is axially opposed to an axially upper end portion of the second tubular unit of the second housing with the current plate interposed therebetween. A recess recessed on an opposite side to the coupling unit in the axial direction is provided on an axially end surface of at least one of an axially lower end surface of the first tubular unit and an axially upper end surface of the second tubular unit.

Abstract: A fan includes a motor, an impeller fixed to the motor, and a housing including a cylindrical inner circumferential surface. The impeller includes a plurality of blades extending radially outward. The housing is arranged to surround outer peripheries of the motor and the impeller. The housing includes an intake port which is an upper opening of the housing, an upper edge which surrounds the intake port, an exhaust port which is a lower opening of the housing, a lower edge which surrounds the exhaust port. An axial distance from an upper end of each of the blades to an upper edge is ½ times or more of an axial distance from the upper end of each of the blades to a lower end thereof. This makes it possible to restrain an air flow having a swirling component from passing through the intake port.

Abstract: A serial axial flow fan in which an end portion of a first axial flow fan on an exhaust side, and an end portion of a second axial flow fan on an intake side are connected to each other. At least either of a plurality of first blades of a first impeller of the first axial flow fan, and a plurality of second blades of a second impeller of the second axial flow fan are provided with auxiliary blade portions. Furthermore, Nin<Nout<Nrib is satisfied, where a number of first blades is Nin, a number of second blades is Nout, and a number of first support ribs and a number of second support ribs are each Nrib.

Abstract: A serial axial flow fan in which an end portion of a first axial flow fan on an exhaust side, and an end portion of a second axial flow fan on an intake side are connected to each other. At least either of a plurality of first blades of a first impeller of the first axial flow fan, and a plurality of second blades of a second impeller of the second axial flow fan are provided with auxiliary blade portions.

Abstract: A fan includes a motor part, an impeller fixed to the motor part, and a housing including a cylindrical inner circumferential surface. The impeller includes a plurality of blades extending radially outward. The housing is arranged to surround outer peripheries of the motor part and the impeller. The housing includes an intake port which is an upper opening of the housing, an upper edge which surrounds the intake port, an exhaust port which is a lower opening of the housing, a lower edge which surrounds the exhaust port. An axial distance from an upper end of each of the blades to an upper edge is ½ times or more of an axial distance from the upper end of each of the blades to a lower end thereof. This makes it possible to restrain an air flow having a swirling component from passing through the intake port.

Abstract: A fan includes a motor, an impeller fixed to the motor, and a housing including a cylindrical inner circumferential surface. The impeller includes a plurality of blades extending radially outward. The housing is arranged to surround outer peripheries of the motor and the impeller. The housing includes an intake port which is an upper opening of the housing, an upper edge which surrounds the intake port, an exhaust port which is a lower opening of the housing, a lower edge which surrounds the exhaust port. An axial distance from an upper end of each of the blades to an upper edge is ½ times or more of an axial distance from the upper end of each of the blades to a lower end thereof. This makes it possible to restrain an air flow having a swirling component from passing through the intake port.

Abstract: A fan includes a motor part, an impeller fixed to the motor part, a housing, and a first circuit board mounted with electronic components. The motor part includes an armature having coils, and a second circuit board connected to the coils and the first circuit board. The housing surrounds outer peripheries of the motor part and the impeller. The housing includes an intake port which is an upper opening of the housing, an exhaust port which is a lower opening of the housing, a flange portion enlarged radially outward from an outer circumferential surface of the housing, and a circuit board fixing portion protruding from the outer circumferential surface and making contact with the first circuit board. The first circuit board is disposed spaced apart from the outer circumferential surface, positioned radially inward of a radial outer edge of the flange portion, and arranged to extend in an axial direction.

Abstract: This fan motor includes a motor, an impeller arranged to rotate together with a rotating portion of the motor, and a housing arranged to house the motor and the impeller therein. The housing includes an inner wall portion, a silencer portion, and a communicating opening. The inner wall portion is arranged to extend along a rotation axis to assume a tubular shape, and is arranged to house at least a portion of the impeller therein. The silencer portion includes a portion arranged radially outside of the inner wall portion, and is arranged to define a silencing space between the inner wall portion and the silencer portion. The communicating opening is arranged to bring a space inside of the inner wall portion into communication with the silencing space. A portion of the communicating opening is defined by an end portion of the inner wall portion on an inlet side. The silencing space is arranged to cover only a portion of the circumferential extent of the inner wall portion.

Abstract: A fan includes a motor part, an impeller fixed to the motor part, a housing, and a first circuit board mounted with electronic components. The motor part includes an armature having coils, and a second circuit board connected to the coils and the first circuit board. The housing surrounds outer peripheries of the motor part and the impeller. The housing includes an intake port which is an upper opening of the housing, an exhaust port which is a lower opening of the housing, a flange portion enlarged radially outward from an outer circumferential surface of the housing, and a circuit board fixing portion protruding from the outer circumferential surface and making contact with the first circuit board. The first circuit board is disposed spaced apart from the outer circumferential surface, positioned radially inward of a radial outer edge of the flange portion, and arranged to extend in an axial direction.

Abstract: A fan includes a motor part, an impeller fixed to the motor part, and a housing including a cylindrical inner circumferential surface. The impeller includes a plurality of blades extending radially outward. The housing is arranged to surround outer peripheries of the motor part and the impeller. The housing includes an intake port which is an upper opening of the housing, an upper edge which surrounds the intake port, an exhaust port which is a lower opening of the housing, a lower edge which surrounds the exhaust port. An axial distance from an upper end of each of the blades to an upper edge is ½ times or more of an axial distance from the upper end of each of the blades to a lower end thereof. This makes it possible to restrain an air flow having a swirling component from passing through the intake port.