US 11,655,827 B2
Pump device
Nobuhiro Kato, Tokai (JP); Takashige Inagaki, Obu (JP); Keiji Nakaya, Nisshin (JP); and Hidemasa Torii, Anjo (JP)
Assigned to AISAN KOGYO KABUSHIKI KAISHA, Obu (JP)
Appl. No. 17/273,254
Filed by AISAN KOGYO KABUSHIKI KAISHA, Obu (JP)
PCT Filed Sep. 17, 2019, PCT No. PCT/JP2019/036338
§ 371(c)(1), (2) Date Mar. 3, 2021,
PCT Pub. No. WO2020/066745, PCT Pub. Date Apr. 2, 2020.
Claims priority of application No. JP2018-178686 (JP), filed on Sep. 25, 2018.
Prior Publication US 2021/0324875 A1, Oct. 21, 2021
Int. Cl. F04D 29/42 (2006.01); F04D 17/08 (2006.01); F04D 25/06 (2006.01); F04D 29/053 (2006.01); F04D 29/056 (2006.01)
CPC F04D 29/4206 (2013.01) [F04D 17/08 (2013.01); F04D 25/06 (2013.01); F04D 29/053 (2013.01); F04D 29/056 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A pump device for pumping a gas, comprising:
a motor portion including a rotor chamber and a rotor rotatably disposed in the rotor chamber, wherein the rotor includes a rotor shaft;
a pump portion including a pump chamber and an impeller rotatably disposed in the pump chamber, wherein the impeller is coupled to the rotor shaft and is configured to rotate with the rotor shaft;
a partition wall separating the rotor chamber from the pump chamber, wherein the partition wall has a first side that faces the pump chamber and a second side that faces the rotor chamber;
a shaft hole extending through the partition wall along a central axis, wherein the rotor shaft extends through the shaft hole; and
a bearing provided in the shaft hole, wherein the bearing rotatably supports the rotor shaft and is configured to be injected with grease,
wherein the partition wall includes a first breathing passage and a second breathing passage that each extend linearly through the partition wall separately from the shaft hole and that each provide fluid communication between the rotor chamber and the pump chamber,
wherein the first breathing passage has a first opening on positioned on the first side of the partition wall and a second opening on the second side of the partition wall, wherein the first opening is radially closer to the shaft opening than the second opening with respect to the central axis, and
wherein the second breathing passage has a third opening positioned on the first side of the partition wall and a fourth opening on the second side of the partition wall, wherein the third opening is radially closer to the shaft opening than the fourth opening with respect to the central axis.