Gas and liquid contact apparatus – Fluid distribution – Valved
Patent
1979-10-29
1981-03-31
Miles, Tim R.
Gas and liquid contact apparatus
Fluid distribution
Valved
261 65, F02M 906
Patent
active
042592666
ABSTRACT:
A variable-venturi carburetor has a throttle valve which is provided downstream in a bore, a venturi portion, a suction chamber which has a rod guide and a suction piston which is disposed perpendicularly to the venturi portion. The suction piston has a rod slidably supported by the rod guide. The carburetor also has a negative pressure chamber which is formed in the suction chamber by the suction piston, and a suction spring which is interposed between the suction chamber and the suction piston. The suction piston is adapted to be moved forward and backward due to balancing relationship appearing between the negative pressure chamber and the suction spring thereby to vary the sectional area of the venturi portion and, at the same time, move a metering needle, which is attached to the piston, forward and backward for metering fuel. In effect the fuel, as a result of suction caused by a flowing air stream, spouts from a main nozzle through which the metering needle travels. The variable-venturi carburetor has within the mixing chamber in the bore at least one bulkhead which is disposed parallel to a plane which includes therein the shaft of the throttle valve and extends in the direction of the bore axis, so that speed of flowing air will not decrease irrespective of amount of intake air. As a result, less fuel is deposited on the wall of bore in the downstream with respect to the venturi portion.
REFERENCES:
patent: 2152951 (1939-04-01), Bracke
patent: 3784173 (1974-01-01), Kawai et al.
Miles Tim R.
Toyota Jidosha Kogyo Kabushiki Kaisha
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