Vannoy funnel exhaust system

Abstract

The passive energy saving device, disclosed herein, may be integrated directly into or added to the exhaust system of an internal combustion engine, to increase the system's fuel efficiency, by acting to reduce the overall backpressure of the total engine and exhaust system. It is a well known fact, accepted by those knowledgeable in the art, that a reduction of exhaust backpressure generally increases the overall fuel efficiency of an internal combustion engine. This passive device consists of a generally funnel shaped outer housing which is open at both ends, and surrounds a smaller diameter, cylindrical exhaust extension tube, which passes longitudinally, on the inside, through the center of the funnel. When airflow is introduced into this funnel, a resulting pressure drop, at the small end of the funnel reduces the backpressure on the vehicle's exhaust system. The net result of the lower exhaust pressure is the increased fuel economy of the vehicle.

Description

[0001]This application is based on provisional application No. 61 / 189,329 filed on Aug. 18, 2008.[0002]Additionally, this non-provisional application Ser. No. 12 / 583,244 was revised to include the invention “specification” which was requested by the PTO in writing on Oct. 6, 2009. And, further this substitute specification is being filed in response to the “Notice of Missing Parts of a Nonprovisional Application” dated Dec. 21, 2009 regarding application Ser. No. 12 / 583,244.[0003]The substitute specification contains no new matter.SPECIFICATION[0004]The present invention relates to a passive energy saving device that improves the fuel economy of any internal combustion engine in a moving vehicle, by lowering the exhaust system backpressure of the vehicle, without the use of moving parts within the device itself.[0005]Energy saving devices, designed to lower the backpressure of the engine's exhaust system, have previously been deployed, in an effort to improve the fuel economy of mov...

AI Technical Summary

Benefits of technology

[0004]The present invention relates to a passive energy saving device that improves the fuel economy of any internal combustion engine in a moving vehicle, by lowering the exhaust system backpressure of the vehicle, without the use of moving parts within the device itself.

[0011]The present invention consists of a generally funnel shaped outer housing, open at both ends, which surrounds a smaller diameter, cylindrical exhaust extension tube, that passes longitudinally, through the inside, of the funnel's center. The outside opening of the exhaust extension tube is affixed to the open end of vehicle's engine exhaust system. The cylindrical exhaust extension tube is suspended uniformly within center of the tapered funnel by a semi-circular mounting bracket affixed to the inside of the funnel housing. The open end of the exhaust extension tube is recessed inside of the funnel, behind the smaller diameter opening of the funnel housing. This arrangement, as described, generates an airflow inside the tapered funnel housing, as the vehicle attains an operating speed and motion. The airflow is introduced into the larger diameter end of the funnel and passes around the exhaust extension tube, passing through the center of the funnel housing. Most importantly, the velocity of this airflow increases as it moves over the exhaust extension tube, toward the smaller end of the funnel housing. The INCREASE in airflow velocity creates a DECREASE in the relative pressure at the smaller end of the funnel. The open end of the exhaust extension tube is located just inside (approximately ⅛ to ¼ inches inside) the smaller open end of the funnel. The decreased relative pressure, present at the smaller end of the funnel housing, creates a reduced backpressure effect on the overall exhaust system of the vehicle. The relative pressure reduction, which occurs inside the funnel, is the result of Bernoulli's Principle, which is an accepted law of fluid dynamics that states: “As the speed of a moving fluid increases, the pressure within the fluid decreases.” The moving fluid, which relates to the present invention, is the airflow present within the funnel.

Problems solved by technology

This required energy input reduces the efficiency of these devices.

These parts will quickly become corroded and likely cease to function correctly, due to the highly corrosive nature of the exhaust gases and moisture expelled from a typical internal combustion engine.

Also, the energy required to turn the fan reduces the overall efficiency of the system.

This increased backpressure further reduces the overall fuel efficiency of the internal combustion engine.

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