Fuel pump tubular pulse damper
AssigneeWalbro Corporation
InventorEdward J. Talaski
Life of this patent
Estimating the term…
Abstract
A pressure pulse damper for a vehicle fuel pump which dampens output fuel pressure pulses and reduces audible noise emanating from the pump. The damper is a thin-wall tube pinched off and sealed at its ends to form at least one chamber, with a compressible gas sealed therein preferably at superatmospheric pressure. Preferably to provide multiple chambers with gas therein, the tube is also pinched together and sealed at locations between its ends. To provide further dampening an elongate body of resilient foam material may be disposed in each chamber.
Claims16
A fuel pressure pulse damper for a fuel pump comprising:
- a hollow body of a thin walled tube of a flexible and resilient plastic material having a pair of spaced apart ends, the wall of the tube being pinched together and permanently sealed adjacent each said end and in at least one portion between said ends to form in cooperation with the tube at least two elongate chambers therein, an elongate body of a resilient foam material disposed in each said chamber, a compressible gas hermetically sealed in each chamber, and said hollow body being in contact with fuel discharged by the pump so that said hollow body and each said body of resilient foam is compressed by pressure pulses in the discharged fuel to dampen the pressure pulses and steady the flow of fuel discharged from the fuel pump.
A fuel pressure pulse damper for a fuel pump comprising:
- a hollow body of a thin walled tube of a flexible and resilient plastic material having a pair of spaced apart ends, the wall of the tube being pinched together and permanently sealed adjacent each said end and in at least one portion between said ends to form in cooperation with the tube at least two chambers therein, a body of a resilient foam material disposed in each chamber, a compressible gas hermetically sealed in each said chamber, and said hollow body being constructed to be carried by the fuel pump in contact with fuel discharged by the pump so that said hollow body and each said body of resilient foam is compressed by pressure pulses in the discharged fuel to dampen the pressure pulses and steady the flow of fuel discharged from the pump.
A fuel pressure pulse damper in combination with a fuel pump comprising:
- a hollow body made from a thin wall tube of a flexible and resilient plastic material having a pair of initially open and spaced apart separate ends, the wall of the tube being pinched together and permanently sealed to form a permanent tube closure portion at least adjacent each said initially open separate end to form in cooperation with the tube at least one chamber therein between an associated pair of said closure portions, a compressible gas hermetically sealed in said at least one chamber at a superatmospheric pressure in the range of 5% to 30% less than a the nominal pressure of fuel discharged from the pump when in use, in cross section the wall of the tube having a nominal thickness in the range of 0.002 to 0.05 of an inch and an outside free-state diameter in the range of 0.1 to 0.5 of an inch, a body of a resilient and compressible foam material disposed in said chamber, said hollow body being carried by the fuel pump in contact with fuel discharged by the pump so that both said hollow body and said body of foam material are compressed by pressure pulses in the discharged fuel to dampen the pressure pulses and steady the flow of fuel discharged from the fuel pump, and a rigid cage having a plurality of ports for admitting fuel, and encircling, supporting and carrying said hollow body in the fuel pump.
Dependencies are inferred from the claim text.