Diesel exhaust fluid tank breather assembly
First Claim
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1. A breather assembly for a diesel exhaust fluid (DEF) tank, said breather assembly comprising:
- a housing having an inlet for ambient air, an interior chamber and an outlet fluidly connectable to the DEF tank;
a particle filter positioned adjacent said ambient air inlet for filtering particles from the air entering said interior chamber; and
,a hydrophobic membrane in said interior chamber interposed between said particle filter and said outlet for preventing outflow of DEF vapor and condensate to said interior chamber, said hydrophobic membrane being positioned so that outflow is in a direction lateral to the plane of said membrane and said outlet is lower than said hydrophobic membrane.
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Abstract
A diesel exhaust fluid (DEF) delivery system includes a tank for DEF, usually a urea aqueous solution, and a pump receiving the DEF from the tank for pressurization and delivery through a nozzle to the exhaust system of a work machine. A breather assembly is provided for the DEF tank and includes a housing having an inlet for ambient air and a particle filter adjacent the inlet for filtering particles. A hydrophobic membrane is interposed between the particle filter and an outlet leading to the tank for preventing outflow of DEF vapor and condensate.
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Citations
18 Claims
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1. A breather assembly for a diesel exhaust fluid (DEF) tank, said breather assembly comprising:
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a housing having an inlet for ambient air, an interior chamber and an outlet fluidly connectable to the DEF tank; a particle filter positioned adjacent said ambient air inlet for filtering particles from the air entering said interior chamber; and
,a hydrophobic membrane in said interior chamber interposed between said particle filter and said outlet for preventing outflow of DEF vapor and condensate to said interior chamber, said hydrophobic membrane being positioned so that outflow is in a direction lateral to the plane of said membrane and said outlet is lower than said hydrophobic membrane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A diesel exhaust fluid (DEF) delivery system comprising:
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a tank for DEF; a pump fluidly connected to said tank for pressurizing DEF; a nozzle fluidly connected to said pump for receiving pressurized DEF and delivering it to a work machine exhaust system; a breather tube fluidly connected to said tank; a breather assembly connected to the upper and of said conduit and comprising a housing having an inlet for ambient air, an interior chamber and an outlet fluidly connected to said breather tube, a particle filter positioned adjacent said ambient air inlet for filtering particles from air entering the interior chamber; and
, a hydrophobic membrane in said interior chamber interposed between said particle filter and said outlet for preventing outflow of vapors and condensate to said interior chamber, said hydrophobic membrane being positioned so that outflow is in a direction lateral to the plane of said membrane and said breather tube is lower than said hydrophobic membrane. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification