US 12,345,265 B2
Pump apparatus
Takehiko Yazawa, Nagano (JP)
Assigned to NIDEC INSTRUMENTS CORPORATION, Nagano (JP)
Filed by NIDEC INSTRUMENTS CORPORATION, Nagano (JP)
Filed on Jun. 23, 2024, as Appl. No. 18/751,333.
Claims priority of application No. 2023-104661 (JP), filed on Jun. 27, 2023.
Prior Publication US 2025/0003412 A1, Jan. 2, 2025
Int. Cl. F04D 13/06 (2006.01); B29C 45/00 (2006.01); B29C 45/26 (2006.01); F04D 29/18 (2006.01); F04D 29/22 (2006.01); F04D 29/28 (2006.01); F04D 29/44 (2006.01); F04D 29/54 (2006.01); H02K 7/14 (2006.01)
CPC F04D 13/06 (2013.01) [F04D 29/2222 (2013.01); H02K 7/14 (2013.01); B29C 2045/0029 (2013.01); B29C 2045/2671 (2013.01); F04D 29/185 (2013.01); F04D 29/288 (2013.01); F04D 29/44 (2013.01); F04D 29/54 (2013.01); F04D 29/547 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A pump apparatus comprising:
a motor having a rotor and a stator; and
an impeller that rotates with the rotor, wherein
the rotor includes a tubular drive magnet and a tubular magnet holding member that is made of a resin, the drive magnet being attached to an outer circumferential side of the magnet holding member,
the impeller includes: a first blade member that is made of a resin and has an even number of four or more blades arranged at a constant pitch in a circumferential direction of the rotor; and a second blade member that is made of a resin, that is formed separately from the first blade member, and to which the first blade member is fixed,
an axial direction of the magnet holding member that is formed in the tubular shape matches an axial direction of the rotor,
when one side in the axial direction of the rotor is set as a first direction side, and an opposite side from the first direction side is set as a second direction side,
the second blade member is integrally formed with the magnet holding member by injection molding, and is formed in a flange shape that expands outward in a radial direction of the rotor from a first direction end of the magnet holding member,
a plurality of the blades is fixed to the first direction side of the second blade member,
a plurality of gate marks is formed on a surface on the first direction side of the second blade member, the plurality of gate marks being disposed on an outer side of an outer circumferential surface of a portion, which is connected to the second blade member, in the magnet holding member in the radial direction of the rotor and being arranged in the circumferential direction of the rotor,
each of the plural gate marks is formed at an intermediate position in the circumferential direction of the rotor between the two of the blades that are adjacent to each other in the circumferential direction of the rotor, and
an even number of the blades are disposed between the gate marks in the circumferential direction of the rotor.