Carburetor

Details Carburetor Carburetor

1997-03-14

1999-06-29

McMahon, Timothy

Gas: heating and illuminating

Carburetors

123527, F02B 4300

Patent

active

059168315

DESCRIPTION:

BRIEF SUMMARY
This invention concerns a carburettor for the supply of fuel gas to mix with combustion air for the mixture to be supplied to power a reciprocating internal combustion engine.
The engine may be used to provide motive power to drive a vehicle, for example, a land running vehicle, or the engine may be a static engine to drive machinery, for example an electrical power generator. Such a generator may be used in a combined heat and power system (CHP) known per se.
To ensure that a fuel gas, for example natural gas, fuelled reciprocating internal combustion engine installation provides the maximum benefit in terms of maximising the power output and efficiency, with the minimum levels of exhaust emissions, the gas must be mixed with the combustion air to meet the following three criteria simultaneously. The method of gas/air mixing (i) must ensure complete homogeneity, (ii) must provide a minimum flow restriction, and (iii) give a constant air/fuel ratio over the whole operating flow range.
An object of the invention is to provide a carburettor capable of being constructed to give a substantially homogeneous mixture of fuel gas and air, and which carburettor can be constructed to provide a low restriction to flow and give a substantially constant air/fuel gas ratio over the whole operating flow range.
According to the invention there is provided a carburettor for the supply of fuel gas to mix with combustion air for the mixture to be supplied to power a reciprocating internal combustion engine, said carburettor comprising a venturi passage for the flow of combustion air therethrough, an obstruction disposed in the throat and said obstruction being spaced from the wall of said throat by a gap wholly surrounding the obstruction, and slot means in the wall of said venturi passage for fuel to emerge from said slot means into the venturi passage, characterised by the slot means being a first slot opening into said gap at said throat and extending circumferentially along the wall of the throat to substantially surround the obstruction, a second slot opening into said gap at said throat and extending circumferentially along an outer wall of the obstruction and said second slot substantially surrounding said obstruction, and passage means to supply fuel gas to said slots for the gas to emerge from said slots into the throat.
In one embodiment of the carburettor, with respect to the general direction of air flow through the venturi from one end of said venturi to the other, a first portion of the obstruction may be upstream of said second slot and a second portion of the obstruction may be downstream of the second slot, and transversely to said general direction of air flow the first portion of said obstruction may have a cross- sectional area which increase along the general direction of air flow and the second portion of said obstruction may have a cross-sectional area which decreases along the general direction of air flow.


BRIEF DESCRIPTION OF THE DRAWINGS

The invention will now be further described, by way of example, with reference to the accompanying drawings in which:
FIG. 1 is a longitudinal section, on line I--I in FIG. 3, of a first embodiment of a carburettor formed according to the invention;
FIG. 2 is a fragment of a section on line II--II in FIG. 3;
FIG. 3 is a front end view, along the direction of arrow III, of the carburettor in FIG. 1, but FIG. 3 being on an enlarged scale relative to FIG. 2;
FIG. 4 is a section on line IV--IV in FIG. 3, but FIG. 4 being enlarged relative to the scale of. FIG. 3, and
FIG. 5 is a longitudinal section similar to FIG. 1 but of a second embodiment of the carburettor formed according to the invention.
In the accompanying drawings like references identify like or corresponding parts.
With reference to FIGS. 1 to 4 a carburettor 2 to supply a mixture of fuel gas, for example natural gas, and air to a reciprocating internal combustion engine (not shown) comprises a venturi 4 having an air inlet end 6 through which combustion air enters to flow in the general direction 8 thr

REFERENCES:
patent: 4152121 (1979-05-01), van der Weide et al.
patent: 5245977 (1993-09-01), Chen et al.
"Erweiterung Des Einsatzbereiche Des M.A.N.--B&W. Bieselmetors Zum Viertakt-Ga-Ottomter," MTZ Mototechnigche Zeitschrift, V26, No. 2, pp. 51-55, 1985.

Affiliated with

Also associated with

Rating

Carburetor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Carburetor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Carburetor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1375303