US 12,221,983 B1
Centrifugal blower with sound absorption structure for automotive HVAC systems
Francesco Mercogliano, Poirino (IT); and Antonio Baiano Svizzero, Poirino (IT)
Assigned to DENSO THERMAL SYSTEMS S.p.A., Poirino (IT)
Filed by DENSO THERMAL SYSTEMS S.p.A., Poirino (IT)
Filed on Feb. 26, 2024, as Appl. No. 18/587,022.
Int. Cl. F04D 29/66 (2006.01); F04D 29/42 (2006.01)
CPC F04D 29/665 (2013.01) [F04D 29/4226 (2013.01); F05D 2260/96 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A housing of plastics material for a centrifugal blower for automotive HVAC systems, comprising a base end wall, a cover end wall and a side wall extending between the base end wall and the cover end wall, in said housing there being defined an impeller chamber and an air outlet duct, wherein on the cover end wall there is formed an air inlet opening facing the impeller chamber, and on the side wall there is formed an air outlet opening facing the air outlet duct,
wherein a sound absorption structure is arranged on said side wall, said sound absorption structure comprising at least one resonant cavity fluidically connected to the impeller chamber and the air outlet duct through a plurality of slits arranged on the side wall and facing at least one of said impeller chamber and air outlet duct,
the housing further comprising
a base half shell formed by the base end wall and by a first portion of the side wall, protruding from the base end wall, said first portion of the side wall surrounding the impeller chamber and delimiting on a radially outer side the air outlet duct,
a cover half shell formed by the cover end wall and by a second portion of the side wall, protruding from the cover end wall, said second portion of the side wall delimiting on a radially inner side the air outlet duct, and
at least one of:
a chamber side panel fitted in a seat formed in the base half shell and facing said impeller chamber, wherein said at least one resonant cavity is formed between the chamber side panel and said first portion of the side wall, and wherein said slits are formed on the chamber side panel, and
an outlet side panel fitted in a seat formed in the cover half shell and facing said air outlet duct, wherein said at least one resonant cavity is formed between the outlet side panel and said second portion of the side wall, and wherein said slits are formed on the outlet side panel,
wherein the base half shell and the cover half shell are joined to each other, and
wherein the chamber side panel is arch-shaped, and the seat in which the chamber side panel is fitted is formed as a recess in the first portion of the side wall, facing the impeller chamber, and wherein the chamber side panel comprises a surface facing the impeller chamber that is flush with a surface, facing the impeller chamber, of an area of the first portion of the side wall adjacent to the seat.