US 11,795,945 B2
Pump device with air introduction hole that opens into pump chamber at predetermined opening time immediately before suction stroke
Norio Takehana, Iwate (JP)
Assigned to MIKUNI CORPORATION, Tokyo (JP)
Filed by MIKUNI CORPORATION, Tokyo (JP)
Filed on Mar. 17, 2022, as Appl. No. 17/696,902.
Claims priority of application No. 2021-073773 (JP), filed on Apr. 26, 2021.
Prior Publication US 2022/0341419 A1, Oct. 27, 2022
Int. Cl. F04C 2/10 (2006.01); F04C 15/06 (2006.01); F04C 15/00 (2006.01)
CPC F04C 2/102 (2013.01) [F04C 2/10 (2013.01); F04C 15/0049 (2013.01); F04C 15/06 (2013.01); F04C 2210/206 (2013.01); F04C 2240/60 (2013.01); F04C 2270/12 (2013.01); F04C 2270/13 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A pump device comprising:
a housing which defines a suction port, a discharge port, and an accommodation chamber; and
a pump unit which is arranged in the accommodation chamber and which defines a pump chamber that expands and contracts to exert a pumping action including a suction stroke and a pressurization and discharge stroke on a fluid,
wherein the housing includes an air introduction hole that is opened to introduce air into the pump chamber at a predetermined opening timing immediately before the suction stroke is completed while the fluid does not continue to flow into the pump chamber,
wherein the pump unit includes an inner rotor that rotates around a predetermined axis and an outer rotor that rotates in conjunction with the rotation of the inner rotor,
wherein when a rotation angle of the inner rotor over a range of the suction stroke is Θ, and a rotation angle of the inner rotor from the opening timing to the completion of the suction stroke is ΔΘa,
ΔΘa is set in a range of 0.08×Θ<ΔΘa<0.12×Θ.