US 12,140,150 B2
Fluid pump impeller
Jea woong Seok, Tokyo (JP)
Assigned to TBK Co., Ltd., Tokyo (JP)
Appl. No. 18/579,044
Filed by TBK Co., Ltd., Tokyo (JP)
PCT Filed Jul. 16, 2021, PCT No. PCT/JP2021/026723
§ 371(c)(1), (2) Date Jan. 12, 2024,
PCT Pub. No. WO2023/286263, PCT Pub. Date Jan. 19, 2023.
Prior Publication US 2024/0287997 A1, Aug. 29, 2024
Int. Cl. F04D 1/00 (2006.01); F04D 29/041 (2006.01); F04D 29/22 (2006.01); F04D 29/62 (2006.01); F04D 29/66 (2006.01)
CPC F04D 29/2216 (2013.01) [F04D 1/00 (2013.01); F04D 29/041 (2013.01); F04D 29/628 (2013.01); F04D 29/669 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A fluid pump impeller rotationally driven around a center axis, comprising an impeller main body including a first shroud and a plurality of blades provided to the first shroud, and a second shroud joined to the impeller main body and so arranged as to face the first shroud in a direction of the center axis with the plurality of blades held therebetween, wherein
the first shroud has a boss so formed as to protrude in the direction of the center axis,
the second shroud has a center hole into which the boss is inserted in the direction of the center axis, and
a recess-like first groove formed in an outer circumferential surface of the boss and a recess-like second groove formed in an inner circumferential surface in the center hole are combined, thereby configuring a balance hole penetrating in the direction of the center axis.