US 12,433,208 B2
Cooling air routing on an electric blower apparatus
Roland Mandel, Stuttgart (DE); Sebastian Piekarek, Stuttgart (DE); Alexander Buchmann, Schwaikheim (DE); Manuel Waiblinger, Stuttgart (DE); Thilo Stuerzel, Remshalden (DE); and Mathias Schmitz, Waiblingen (DE)
Assigned to Andreas Stihl AG & Co. KG, Waiblingen (DE)
Filed by Andreas Stihl AG & Co. KG, Waiblingen (DE)
Filed on Dec. 21, 2022, as Appl. No. 18/069,803.
Claims priority of application No. 21216628 (EP), filed on Dec. 21, 2021.
Prior Publication US 2023/0189727 A1, Jun. 22, 2023
Int. Cl. A01G 20/47 (2018.01); B25F 5/00 (2006.01)
CPC A01G 20/47 (2018.02) [B25F 5/008 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An electric blower apparatus comprising:
a blower spiral having an axial end face defining a shaft opening;
a fan wheel configured to rotate in said blower spiral;
an electric motor disposed on said axial end face of said blower spiral and having a drive shaft which protrudes through said shaft opening in said axial end face and into said blower spiral;
said drive shaft being connected to said fan wheel;
said axial end face further defining a first cooling air opening, wherein a cooling air flow that cools said electric motor is routed by way of said first cooling air opening;
said first cooling air opening being disposed in a pressure region of said blower spiral; and,
said cooling air flow to said electric motor is a pressurized air flow having a flow direction which from said blower spiral is directed by way of said first cooling air opening to said electric motor;
the electric blower apparatus further comprising control electronics configured to energize the electric motor from an energy source in dependence upon an operator-controlled element;
wherein said cooling air flow is a first cooling air flow;
said axial end face of said blower spiral defining a second cooling opening by way of which a second cooling air flow is guided from said blower spiral to said control electronics via said second cooling opening; and,
said first cooling air flow and said second cooling air flow are mutually separate cooling air flows.