Tenneco has filed a patent for a mixing device that can be integrated into an exhaust pipe of an internal combustion engine. The device features a housing with a tubular wall and an intermediate wall that divides the housing. The device also includes inflow and outflow openings, as well as a flow guide element that allows for the deflection of the exhaust gas stream. The patent claim provides further details on the specific design and positioning of the various components. GlobalData’s report on Tenneco gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on Tenneco, piston head combustion chambers was a key innovation area identified from patents. Tenneco's grant share as of September 2023 was 63%. Grant share is based on the ratio of number of grants to total number of patents.

Mixing device for exhaust gas stream in internal combustion engine

Source: United States Patent and Trademark Office (USPTO). Credit: Tenneco Inc

A recently filed patent (Publication Number: US20230313723A1) describes a mixing device designed to be integrated into the exhaust pipe of a combustion engine. The device is responsible for mixing the exhaust gas stream. The mixing device consists of a housing with a tubular wall and a mid-axis that can be aligned parallel to the exhaust pipe. An intermediate wall is aligned transversely to the mid-axis and divides the housing into an inflow side and an outflow side. The intermediate wall features at least one inflow opening positioned eccentrically with respect to the mid-axis and brought close to a wall section of the tubular wall. On the outflow side, a flow guide element is provided, which at least partly bounds a mixing chamber with the intermediate wall. The flow guide element allows for the deflection of the exhaust gas stream from its original flow direction into a radial direction in relation to the mid-axis. The flow guide element features at least two outflow openings, positioned eccentrically with respect to the mid-axis and brought close to a wall section of the tubular wall. The outflow openings are arranged on opposite sides of the flow guide element with respect to its longitudinal axis. The mixing device allows for the guidance of partial streams of the exhaust gas flow in both clockwise and anticlockwise directions out of the outflow openings.

The patent also describes additional features of the mixing device. It mentions the provision of a first flow guide element on the intermediate wall, which protrudes upstream in the axial direction and divides the exhaust gas stream into two partial streams. The flow guide elements can be designed as a single piece and can be integral parts of the intermediate wall or the tubular wall. The angle between the intermediate wall and the mid-axis can range from 20° to 80°. The intermediate wall can have a single or multiple angled, contoured, or curved form. The mixing chamber can include a corrugated base and/or a flow guide element to avoid a steam bottleneck. The intermediate wall can be partially integrated into the housing or formed from the housing. The mixing device can also include a feed device for introducing additives into the mixing chamber. The inflow and outflow openings have specific profiles, and additional inflow and outflow openings can be provided with their own profiles. Flow blades can be added to the inflow and outflow openings, and static mixers or baffle plates can be included in the mixing chamber.

Overall, this patent describes a mixing device for exhaust gas streams in combustion engines that offers improved mixing capabilities and flexibility in controlling the flow direction of the exhaust gases.

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