Pump device with air introduction hole that opens into pump chamber at predetermined opening time immediately before suction stroke
AssigneeMikuni Corporation
InventorNorio Takehana
Life of this patent
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Abstract
The disclosure provides a pump device capable of suppressing hydraulic amplitude and reducing noise or vibration associated with hydraulic amplitude while simplifying the structure. The pump device includes: 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. 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.
Claims10
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.
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, and a rotation angle of the inner rotor from the completion of the suction stroke to the closing timing is ΔΘb,
- ΔΘa is set in a range of 0.08×Θ<ΔΘa<0.12×Θ, and
- ΔΘb is set in a range of 0.6×ΔΘa<ΔΘb<0.7×ΔΘa.
Dependencies are inferred from the claim text.