Power plants – Internal combustion engine with treatment or handling of... – Exhaust gas or exhaust system element heated – cooled – or...
Reexamination Certificate
1999-04-21
2001-01-23
Walberg, Teresa (Department: 3742)
Power plants
Internal combustion engine with treatment or handling of...
Exhaust gas or exhaust system element heated, cooled, or...
C060S614000
Reexamination Certificate
active
06176082
ABSTRACT:
TECHNICAL FIELD
This invention relates generally to an exhaust manifold cooling assembly for use with an internal combustion engine and more particularly to the exhaust manifold assembly being cooled by cooled exhaust gas.
BACKGROUND ART
In modern engine technology, turbochargers are powered by the hot exhaust gas from the engine. It is desirable to convey the hot exhaust gas from the engine to the turbocharger in as high a temperature state as is possible. Some engine applications may make use of the exhaust's thermal heat. Recovery of the engine's wasted exhaust gas thermal heat may be used for warming residential living, factory assembly spaces, and the like depending on engine application. Recovery of the thermal heat is typically desirable at high heat rejection temperatures to allow for a more compact cooling system design. It is also desirable to maintain the temperature of the exhaust manifold below a predetermined temperature, such as below 750 degrees C. Prior techniques provide water jackets disposed about exhaust manifolds to reduce the temperature of the manifold. Unfortunately, the use of water jackets reduces the temperature of the exhaust gas, thereby reducing the energy supplied to the turbocharger and also the temperature of recoverable heat energy.
Some attempts have been made to produce a manifold with temperatures within allowable limits and, at the same time, to maintain the temperature of the exhaust gas as high as possible. One such system provides a sleeve inside the manifold which is surrounded by an air space. The air space provides insulation for the hot exhaust gas to keep their temperature as high as possible and, at the same time, to reduce the amount of heat transmitted to the water of the water jacket. That system also provides for accommodating for the heat insulating sleeve increasing in diameter under the expansion caused by the hot exhaust gas. In addition, in at least one version of said prior device, the heat insulation sleeve is cast in place in the manifold which makes it almost impossible to replace the heat insulation sleeve when it deteriorates or fails.
Another device, insulation material is provided around a heat insulating sleeve and a specially designed sliding connection is provided between the sleeve and a tube extending from each exhaust port of the engine. These connections are complicated, expensive and substantially impossible to maintain and service.
In another device, heat insulation is provided between the inner sleeve and an intermediate sleeve, with the inner sleeve being capable of axial movement against specially designed collapsible gaskets located between adjoining ends of the sleeves.
Another device discloses a manifold wherein the outer shell of the manifold is made in two parts which parts are assembled around an inner shell of the manifold so as to form a water jacket for cooling the inner shell with no insulation being provided for the inner shell.
The present invention is directed to overcoming one or more of the problems as set forth above.
DISCLOSURE OF THE INVENTION
In one aspect of the invention an exhaust manifold cooling assembly for an internal combustion engine comprises a turbocharger, an exhaust manifold, a heat exchanger, and an outer shell. The turbocharger has a turbine section. The turbine section has an inlet end and an outlet end. The exhaust manifold has an exhaust inlet portion and an exhaust outlet portion. The exhaust inlet portion is connected to the engine and the exhaust outlet portion is connected to the inlet end of the turbine section. The exhaust manifold passes heated exhaust gas from the engine to the inlet end of the turbine section. The heat exchanger has an inlet end and an outlet end. The inlet end is connected to the outlet end of the turbocharger. The heat exchanger is adapted to cool heated exhaust gas passed from the outlet end of the turbine section. The outer shell has an inlet portion and an outlet portion. The outer shell defines a cooling spaced passageway disposed about and generally surrounds the exhaust manifold. The inlet portion of the outer shell is connected to the outlet end of the heat exchanger and the outlet portion is connected to an opening. The outer shell passes cooled exhaust gas from the outlet end of the heat exchanger to the opening.
In another aspect of the present invention a method for cooling an exhaust manifold assembly for an internal combustion engine having a heat exchanger, an exhaust manifold, and an outer shell disposed about the exhaust manifold comprises the following steps. Passing exhaust gas from the engine through the exhaust manifold into the heat exchanger. Cooling the exhaust gas with the heat exchanger. Passing the cooled exhaust gas from the heat exchanger, through the outer shell and about the exhaust manifold. The cooled exhaust gas absorbs heat from the exhaust manifold.
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Caterpillar Inc.
Dahbour Fadi H.
Golden James B.
Hickman Alan J.
Walberg Teresa
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