Fuel air mixer for combustion engines

摘要

A fuel air mixer includes a fuel air mixing tube having an inlet, an outlet, and an inlet inner diameter. A collar is attached at the mixing tube inlet and includes a first cylindrical portion upstream of the mixing tube inlet, and a body portion encircling the mixing tube at the mixing tube inlet and forming a fuel reservoir around the mixing tube inlet. The first cylindrical portion is spaced from the mixing tube inlet to create a gap placing the fuel reservoir in fluid communication with the mixing tube inlet. The first cylindrical portion has an inner diameter that is smaller than the inlet inner diameter so air flowing through the first cylindrical portion and into the mixing tube inlet draws gaseous fuel from the fuel reservoir into the mixing tube through the gap.

主权项

1. A fuel air mixer, comprising: a mixing tube comprising a mixing tube inlet with an annular rim and mixing tube inlet inner diameter, and a mixing tube outlet in fluid communication with the mixing tube inlet;
a first cylindrical portion disposed upstream of the mixing tube inlet and having a first edge, an oppositely disposed second edge disposed proximate the mixing tube inlet with the second edge of the first cylindrical portion and the annular rim of the mixing tube inlet being spaced apart by an opening, and a first cylindrical portion inner diameter that is less than the mixing tube inlet inner diameter; a body portion encircling the mixing tube inlet and engaging the mixing tube and the first cylindrical portion so that an inner surface of the body portion and an exterior surface of the mixing tube encircled by the body portion define a fuel reservoir with the opening between the second edge of the first cylindrical portion and the annular rim of the mixing tube inlet placing the fuel reservoir in fluid communication with the mixing tube inlet, wherein a width of the opening between the second edge of the first cylindrical portion and the annular rim is a fixed distance that cannot be varied when the fuel air mixer is assembled, and wherein the body portion further includes a fuel inlet port placing the fuel reservoir in fluid communication with an exterior of the body portion; wherein the body portion comprises: a second cylindrical portion having a first edge, an oppositely disposed second edge, and a second cylindrical portion inner diameter; an intermediate cylindrical portion disposed between the first cylindrical portion and the second cylindrical portion and having a first edge, an oppositely disposed second edge, and an intermediate cylindrical portion inner diameter that is greater than the second cylindrical portion inner diameter; a first transition portion connecting the first cylindrical portion to the intermediate cylindrical portion; and a second transition portion connecting the second cylindrical portion to the intermediate cylindrical portion.