US 4,375,438 AGranted

Carburetor and circular discharge nozzle therefor

OwnerRandolph W. McKayinventor

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Abstract

A carburetor has a main body provided with a float bowl for holding a volatile liquid fuel, at least one barrel through which combustion air flows, and a fuel supply passage leading from the float bowl to the region of the barrel, all of which is generally conventional. In addition, the carburetor is provided at the entrance to the barrel with a circular discharge nozzle for introducing the fuel into the combustion air. To this end, the nozzle is in communication with the fuel supply passage and is configured to hold a pool of the volatile liquid fuel which flows from the float bowl through the passage and into the nozzle. The nozzle contains apertures which open toward the airstream so that the pressure within the nozzle generally equalizes with that of the airstream. As a consequence, the fuel evaporates quite readily from the pool, and the vaporized fuel escapes into the airstream in sufficient quantity to produce a combustible mixture. The discharge nozzle may assume various configurations, among which are single rings, concentric rings, and disks.

Claims13

Dependent claims

In combination with a carburetor having a main body provided with a reservoir for containing a volatile liquid fuel, at least one barrel surrounded by a surface which converges and then diverges to create a venturi in the barrel, a cavity located ahead of the barrel, a fuel passage leading from the reservoir to the region of the cavity, and means within the barrel downstream from the venturi thereof for controlling the amount of air that passes through the barrel, the improvement comprising:

a hollow ring located in the cavity ahead of the barrel so that air before entering the barrel passes by the ring, the ring having openings that expose the hollow interior of the ring to the intake cavity so that the interior of the ring assumes a pressure close to that of air passing through the ring, the openings further being located above the bottom of the ring to enable liquid fuel to collect within the ring in a pool;
and a feed tube connecting the interior of the ring with the fuel passage so that liquid fuel flows from the reservoir to the interior of the ring and produces a pool within the ring;
the interior diameter of the ring being at least substantially as large as the diameter of the throat of said venturi, and the diameter and number of the apertures within it being such that air passing through the ring during operation of the carburetor causes the fuel to evaporate from the pool within the ring and escape into the air substantially as a vapor and in sufficient quantity to produce a combustible mixture of fuel and air within the barrel.

The combination with a carburetor body having a reservoir for containing a volatile liquid fuel, two barrels located side-by-side with each being defined by a converging and diverging surface which creates a venturi within the barrel, a common air intake cavity located upstream from and opening into both barrels, a mounting surface located at the cavity and being designed for supporting a booster venturi cluster, and fuel passages extending from the reservoir to the mounting surface, a circular discharge nozzle cluster positioned on the mounting surface in lieu of a booster venturi cluster, said cluster comprising:

a mounting bar secured against the mounting surface;
feed tubes extended from the mounting bar into the cavity, the tubes being in communication with the feed passages of the carburetor body through the mounting bar;
circular discharge nozzle rings attached to the feed tubes and supported within the cavity by the feed tubes such that they are positioned ahead of and generally in axial alignment with the barrels, each nozzle ring being circular and tubular and having apertures located above the bottom thereof so that liquid fuel from the feed tube with which it is connected will collect within the nozzle ring to form a pool, the interior diameter of the nozzle rings being at least substantially as large as the diameters of the throats of said venturies, and the diameter and number of the apertures within the rings being such that air passing through the rings and into the barrels during normal operation of the carburetor will cause the liquid fuel within the pools to evaporate and escape into the air substantially as a vapor and in sufficient quantity to create a combustible mixture within the barrels.

Dependencies are inferred from the claim text.