Patent Application
20150252705
The invention relates to after treatment devices for internal combustion engines of work vehicles. It also relates to self-cleaning filter systems for such devices.
Internal combustion engines used in vehicles face increasingly stringent regulation. The regulations require that the engines produce a low level of pollutants. One way of reducing the pollutants is to provide exhaust components (such as aftertreatment devices) to treat the exhaust gas. These exhaust components operate at elevated temperatures, which can cause their outer surfaces become quite hot.
Work vehicles, such as agricultural harvesters, generate a great deal of combustible particles that accumulates on free surfaces of the exhaust components. One method of preventing this accumulation is to enclose the exhaust components in a housing. The temperatures can be elevated, however, and therefore air is circulated through the housing to prevent the housing from becoming too hot.
The air circulated through the housing must be clean, however, and relatively free of the combustible particles generated by the agricultural harvester. Given the small size of the particles, however, it is difficult to filter the air sufficiently clean to prevent particle accumulation on the exhaust component. Due to the large volume of air that must be circulated around the exhaust component, any filter rapidly becomes clogged. If the filter becomes clogged, the temperature of the housing begins to rise, and any combustible particles that have accumulated on the outside of the housing are prone to catch fire.
Unfortunately, the operator must stop his agricultural harvester, climb down from the operator's cabin, open the engine covers, clean the filter, return to the operator's cabin, and begin harvesting again. This is a time-consuming process.
What is needed, therefore, is an after cleaning device arrangement that requires less maintenance. It is an object of this invention to provide such an arrangement
In accordance with a first aspect of the invention a self-cleaning exhaust component arrangement is provided comprising: an exhaust component; a housing enclosing the exhaust component; a filter arrangement coupled to the housing to supply the housing with a flow of filtered air, the filter arrangement further comprising a filter element; wherein the filter arrangement is configured to direct air in a first direction through the filter element to provide the flow of filtered air, and is further configured to direct air in a second direction through the filter element to clean the filter element.
The filter arrangement may comprise a motor coupled to the filter element, the motor being configured to move the filter element from a first position in which a portion of the filter element filters air entering the housing to a second position in which the portion of the filter element is cleaned by air exiting the housing. The motor may be configured to move the filter element from the second position to the first position thereby permitting the portion of the filter element to be reused in the first position after being cleaned in the second position. The filter element may be coupled to a motor to drive the filter element in rotation. The filter element may be in a form selected from a group comprising a disk and a cylinder. The filter element may be in a form selected from the group comprising a generally circular disk and a generally circular cylinder. The exhaust component may be an aftertreatment device. The exhaust component may be a diesel particulate filter.
Referring to
The aftertreatment device 100 is a generally cylindrical body. The housing 102 is a generally cylindrical shell that extends around and encloses the aftertreatment device 100. The filter arrangement 104 is fixed to an upper part of the housing 102. An air pump or fan 106 is coupled to an inlet conduit 108 to provide the filter arrangement 104 with a flow of air. The inlet conduit 108 conducts air into a filter shell 112 that surrounds a filter element 114. The filter element 114 is generally in the form of a circular cylinder having a filter media that is corrugated to provide a greater filtering capacity much the same as the combustion air filter of an automobile.
The filter shell 112 fits closely against the outer surface of the filter element 114 such that air introduced into the filter shell 112 is forced through an inlet surface 116 of the filter element 114 adjacent to an outlet of the inlet conduit 108.
Air passing through the filter element 114 is filtered such that the particles entrained in the air are removed and deposited on the inlet surface 116 of the filter element 114.
The air, having passed through the filter element 114 in the region of the inlet conduit 108, is then received by a first filtered air conduit 118. The first filtered air conduit 118 directs this filtered air downward and into a space 120 formed between the outer surface 122 of the aftertreatment device 100 and the inner surface 124 of the housing 102.
The filtered air then flows around the aftertreatment device 100 until it reaches a second filtered air conduit 126. The second filtered air conduit 126 directs the filtered air back through the filter element 114 in a direction of flow that is opposite to the direction of flow by which the air was initially filtered. As the filtered air passes in the opposite direction through the filter element 114, the air blows combustible particles off the inlet surface 116 of the filter element 114. This works to clean the filter element 114 and extend its life.
In order to clean the combustible particles off the inlet surface 116, however, the filter element 114 must be rotated with respect to the (stationary) filter shell 112. To do this, a motor 128 is provided that is coupled (via a shaft 130), to the filter element 114. The motor 128 drives the filter element in rotation, rotating the filter element 114 about its central axis 132. This moves the portions of the inlet surface 116 (that have previously accumulated combustible particles) from the region of the inlet conduit 108 to the region of the second filtered air conduit 126.
The housing 102 surrounds and encloses the aftertreatment device 100 in the embodiment of
Referring to
The air pump or fan 106 is coupled to an inlet conduit 108′ to provide the filter arrangement 104′ with a flow of air. The inlet conduit 108′ conducts air into a filter shell 112′ that surrounds a filter element 114′. The filter element 114′ is in the general form of a circular disk
The filter shell 112′ fits closely against the outer surface of the filter element 114′ such that air introduced into the filter shell 112′ is forced through an inlet surface 116′ of the filter element 114′ adjacent to an outlet of the inlet conduit 108′.
Air passing through the filter element 114′ is filtered such that the particles entrained in the air are removed and deposited on the inlet surface 116′ of the filter element 114′.
The air, having passed through the filter element 114′ in the region of the inlet conduit 108′ is then received by first filtered air conduit 118′. The first filtered air conduit 118′ directs this filtered air downward and into the space 120 formed between the outer surface 122 of the aftertreatment device 100 and the inner surface 124 of the housing 102.
The filtered air then flows around the aftertreatment device 100 until it reaches a second filtered air conduit 126′. The second filtered air conduit 126′ directs the filtered air back through the filter element 114′ in a direction of flow that is opposite to the direction of flow by which the air was initially filtered. As the filtered air passes in the opposite direction through the filter element 114′ the air blows combustible particles off the inlet surface 116′ of the filter element 114′ this works to clean the filter element 114′ and extend its life.
In order to clean the particles off the inlet surface 116′, however, the filter element 114′ must be rotated with respect to the (stationary) filter shell 112′. To do this, the motor 128 is provided that is coupled (via a shaft 130′) to the filter element 114′ the motor 128′ drives the filter element 114′ in rotation rotating the filter element 114′ about its central axis 132′. This moves the portions of the inlet surface 116′ (that have previously accumulated particles) from the region of the inlet conduit 108′ to the region of the second filtered air conduit 126′.
The housing 102 surrounds and encloses the aftertreatment device 100 in the embodiment of
The figures and explanations herein illustrate two embodiments of the invention. The invention is not limited to the illustrated embodiments, however. To one skilled in the art of corn head design and operation, other embodiments of the invention are also possible.
