Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – Waste gas purifier
Patent
1996-06-06
1998-03-24
McMahon, Dorothy
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
Waste gas purifier
60322, 181213, 181214, 422168, B01D 5394
Patent
active
057309469
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a combined catalytic converter and muffler device. Said device is primarily intended for lawn mower applications, but can also be applied for other smaller engines. The device consists of a housing within which a catalytic substance is applied. The exhaust gases are brought to pass through the catalytic substance together with air, in order to achieve further combustion and reactions.
STATE OF THE ART
Combined catalytic converters and mufflers are as such, previously known. They commonly use a monolithic catalytic material in the shape of a honeycomb structure. Such a structure entails that gases can only flow in one predetermined direction through the material. This in turn causes restrictions to the design of the device, which makes it cumbersome. Such a catalytic material is also relatively expensive.
In order to regulate the inflow of air to the catalytic converter, valves or flaps at the air inlet have been used, also complicating the design.
The present invention is a new design using a catalytic material in the form of pellets. By designing the gas ducts in a suitable manner, no flaps or moving parts at the air inlet are necessary.
SUMMARY OF THE INVENTION
The present invention thus provides a combined catalytic converter and muffler device to be fitted to the exhaust pipe of a combustion engine. Said device comprises a housing within which a catalytic substance is arranged.
According to the invention, the exhaust inlet is provided with a restrictor, preferably in the shape of a cone at the exhaust inlet. Thereby, a correct suction flow of air through the air inlet is achieved, said inlet preferably comprising an air labyrinth.
According to the preferred embodiment, the catalytic substance has pellet form and is arranged within an annular chamber in the housing, having a circular shape.
Other embodiments of the invention are described in further detail in the appended claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in detail below, with reference to the enclosed drawings, in which:
FIG. 1 shows a side view of the combined catalytic converter and muffler device according to the present invention, and
FIG. 2 is a cross section view of the device.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
The invention thus relates to a combined catalytic converter and muffler for small engines, e.g. for lawn mowers, chain saws and the like. Today, these engines generally lack efficient emission control, and consequently there is a great need for such a device. The present device may of course be used on new engines as well as be retro-fitted on used engines.
The device is to be attached to the engine exhaust pipe where a conventional muffler was previously fitted. The device according to the invention has a special design of the exhaust inlet, causing air to be entrained through a special air inlet. Within the same housing, a catalytic substance is located. The auxiliary air is necessary for the combustion within the catalytic substance in order to reduce the dangerous emissions. In the same housing, there is also a further substance for the achievement of muffling and cooling of the hot exhaust gases.
FIG. 1 shows a side view of the housing 1. Said housing is circular, seen from above, and has an exhaust outlet 2 arranged over a certain part of the circumference. The exhaust outlet is equipped with a wire net or similar. When fitted to the the engine, the exhaust outlet 2 is to be turned away from the user, i.e forward in the case of lawn mowers.
FIG. 2 shows a cross section through the device according to the invention. Said device preferably consists of two cylindrical sections, a smaller section 4 and a larger section 5. The smaller section 4 is attached to the engine exhaust pipe (not shown) by means of Screws or the like, passing through holes 10 crossing through the whole housing. The exhaust gases are forced by the engine through an exhaust inlet 3 having a restriction in the shape of a cone 6. Said cone 6 causes
REFERENCES:
patent: 3642095 (1972-02-01), Fujii
patent: 4050903 (1977-09-01), Bailey et al.
patent: 4105090 (1978-08-01), Tachihana et al.
patent: 4116303 (1978-09-01), Trudell
patent: 4148860 (1979-04-01), Goedicke
patent: 4209493 (1980-06-01), Olson
Dahlmans Klippo AB
McMahon Dorothy
LandOfFree
Combined catalytic converter and muffler does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Combined catalytic converter and muffler, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Combined catalytic converter and muffler will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2286550