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US 6,082,984 AGranted
Fluid pump having pressure pulsation reducing passage
AssigneeDenso Corporation
InventorsTatsuya Matsumoto, Motoya Ito, Fumihiro Nimura
Life of this patent
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Abstract
A fuel pump comprises a pump unit and a motor unit. The pump unit is a trochoid gear type having rotors in a pump chamber defined by a pair of side plates and a cylindrical housing. A disk plate is attached to the side plate to provide an arcuate-shaped pressure pulsation reducing passage jointly with the side plate. Protrusions or recesses are provided in the passage to cause turbulence in fuel flowing through the passage. This turbulence scatters pressure pulsation in the fuel thereby to reduce the pressure pulsation.
Claims10
A fluid pump comprising:
- a housing;
- a pair of side plates provided on both sides of the housing to define a pump chamber;
- a plate attached to one of the side plates to provide a fluid passage with the one of the side plates at a downstream of the pump chamber;
- and
- at least one of protrusions and recesses provided in the fluid passage to generate turbulence in fluid discharged from the pump chamber and flowing in the fluid passage, thereby reducing pressure pulsation in the fuel discharged from the fluid passage.
2 more elements
Dependencies are inferred from the claim text.