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A gaseous fuel and air mixing venturi device adapted for retrofitting in a carburetor has a venturi body with a passage for air flow through the body, the passage having a throat of reduced cross-sectional area. The body has an axial fuel inlet port at a first end and fuel supply ports connected to

A gaseous fuel and air mixing venturi device adapted for retrofitting in a carburetor has a venturi body with a passage for air flow through the body, the passage having a throat of reduced cross-sectional area. The body has an axial fuel inlet port at a first end and fuel supply ports connected to the fuel inlet port and spaced around the throat for supplying fuel to the air flow passage for mixing with air flowing through the passage. The first end of the venturi body has mating seating formations for seating against corresponding seating surfaces of a gaseous fuel carburetor after removal of a spring mass air/fuel mixing section, and a fastener mechanism for releasably securing the venturi body in the carburetor, with the fuel supply port of the carburetor connected to the fuel inlet port of the venturi body.

대표청구항 ▼

The invention claimed is: 1. A venturi insert device for a gaseous fuel carburetor, comprising: a venturi body with a passage for air flow through the venturi body, the passage having an air inlet end, a fuel-air mixture outlet end, and a venturi throat of reduced cross-sectional area; the venturi

The invention claimed is: 1. A venturi insert device for a gaseous fuel carburetor, comprising: a venturi body with a passage for air flow through the venturi body, the passage having an air inlet end, a fuel-air mixture outlet end, and a venturi throat of reduced cross-sectional area; the venturi body being of predetermined shape and dimensions adapted for seating engagement with a carburetor such that the air inlet end communicates with an air inlet of the carburetor and the fuel-air mixture outlet communicates with the outlet of the carburetor; the venturi body having an outer flange of predetermined dimensions adapted for engagement with a fuel-air mixer seating rim of a carburetor housing; the venturi body having a fuel inlet port adapted for communication with a fuel supply port of the carburetor; a cover member extending over part of the venturi body to define a fuel supply chamber between the cover member and venturi body, the fuel supply chamber communicating with the fuel inlet port; a plurality of fuel supply openings in the venturi body connecting the fuel supply chamber with the venturi throat; and fastener devices adapted to secure the venturi body to the carburetor housing. 2. The device of claim 1, wherein the fuel supply openings are provided at spaced intervals in a ring around the venturi throat. 3. The device of claim 1, wherein the venturi throat has a region of minimum cross-sectional area, and the fuel supply openings are located at said region. 4. The device of claim 1, further comprising a seal device on the fuel inlet port adapted for sealing between the fuel inlet port and carburetor fuel supply port when the device is mounted in a carburetor. 5. The device of claim 4, further comprising a biasing device in the venturi body adapted to bias the seal device into sealing engagement with the carburetor fuel supply port. 6. The device of claim 1, wherein the venturi body has an outer sleeve portion and a central hub portion, the venturi throat being defined between the outer sleeve portion and central hub portion, the cover member comprising an outer sleeve mounted over the outer sleeve portion, the fuel supply chamber comprising an annular chamber between the outer sleeve and outer sleeve portion, and the fuel supply openings comprising an annular ring of openings around the outer sleeve portion. 7. The device of claim 6, wherein the central hub portion is hollow and the fuel inlet port comprises an open end of the central hub portion, and a plurality of hollow spray bars extend radially between the central hub portion and outer sleeve portion, each spray bar communicating with the interior of the central hub portion and with the fuel supply chamber, and having a series of spaced fuel supply openings along its length. 8. The device of claim 7, further comprising a series of spaced fuel supply openings extending in a ring around the central hub portion. 9. The device of claim 7, wherein each spray bar has opposite side walls and fuel supply openings are provided in both side walls of each spray bar. 10. The device of claim 1, further comprising a fuel stem extending from the fuel inlet port and adapted for releasable sealing engagement with the carburetor fuel supply port when the venturi body is secured in a carburetor housing. 11. The device of claim 10, wherein the fuel stem has a reduced diameter end portion for engagement in a valve seat of the carburetor fuel supply port. 12. The device of claim 11, further comprising a seal member engaging over the reduced diameter end portion for sealing engagement between the valve seat and fuel stem. 13. The device of claim 10, wherein the fuel stem is separate from the venturi body, and is adapted for releasable connection between the fuel inlet port of the venturi body and the carburetor fuel supply port. 14. The device of claim 13, further comprising a biasing member between the fuel inlet port and fuel stem. 15. The device of claim 1, wherein the venturi body comprises first and second opposing plates defining the venturi throat between opposing inner faces of the plates, and a cover plate secured over the first plate to define the fuel supply chamber between the cover plate and first plate, the fuel supply openings being located in a ring around the first plate at a location corresponding to the venturi throat. 16. The device of claim 1, wherein the outer flange of the venturi body has a plurality of fastener openings adapted for alignment with corresponding openings in the seating rim of a carburetor housing when the device is in seating engagement with the carburetor, the fastener devices being adapted to extend through the aligned openings to releasably secure the venturi body to the carburetor. 17. The device of claim 1, wherein the fuel inlet port is adapted for engagement over the carburetor fuel supply port.