US 12,404,871 B2
Fluid pumps
Travis H. Marshall, West Hartford, CT (US); and Adrian L. Stoicescu, Roscoe, IL (US)
Assigned to Collins Engine Nozzles, Inc., Des Moines, IA (US)
Filed by Collins Engine Nozzles, Inc., Des Moines, IA (US)
Filed on Dec. 18, 2023, as Appl. No. 18/543,466.
Application 18/543,466 is a division of application No. 17/359,441, filed on Jun. 25, 2021, granted, now 11,846,300.
Prior Publication US 2024/0117814 A1, Apr. 11, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. F04D 29/42 (2006.01); F04D 1/04 (2006.01); F04D 17/08 (2006.01)
CPC F04D 29/4206 (2013.01) [F04D 1/04 (2013.01); F04D 17/08 (2013.01); F04D 29/426 (2013.01); F05D 2230/31 (2013.01); F05D 2240/10 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A fluid pump case, comprising:
an interior volute surface defining a volute channel, comprising:
a first portion having a D-shaped cross-section defined entirely by the case;
a second portion having a teardrop shaped cross-section downstream of the first portion; and
a transition portion between the first portion and the second portion having a changing cross-section, wherein the second portion is shaped such that it is additively manufactured without support structure.