US 12,305,652 B2
Vacuum pump
Toshiki Yamaguchi, Chiba (JP)
Assigned to Edwards Japan Limited, Chiba (JP)
Appl. No. 18/547,938
Filed by Edwards Japan Limited, Chiba (JP)
PCT Filed Mar. 11, 2022, PCT No. PCT/JP2022/010898
§ 371(c)(1), (2) Date Aug. 25, 2023,
PCT Pub. No. WO2022/196560, PCT Pub. Date Sep. 22, 2022.
Claims priority of application No. 2021-044046 (JP), filed on Mar. 17, 2021.
Prior Publication US 2024/0141906 A1, May 2, 2024
Int. Cl. F04D 17/16 (2006.01); F04D 29/28 (2006.01); F04D 29/42 (2006.01)
CPC F04D 17/168 (2013.01) [F04D 29/28 (2013.01); F04D 29/4206 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A vacuum pump comprising:
a rotor blade configured to rotate about a vertical axis and having a gas exit portion extending in a vertical direction to define a vertical extent;
a casing housing the rotor blade; and
an unobstructed annular buffer space extending in a radial direction between the entire vertical extent of the gas exit portion to an annular surface, wherein
the vacuum pump is configured to exhaust sucked gas in the radial direction of the rotor blade by rotation of the rotor blade, and
an outlet port for the gas is provided at a position that is offset from a position of the gas exit portion of the rotor blade in a direction of the vertical axis.