Flow-through mufflers with optional thermo-electric, sound cancellation, and tuning capabilities
First Claim
1. A flow-through muffler, comprising:
- a housing including a lower section and a lid, a plurality of internal baffles arranged to form unobstructed flow-through passages extending from an inlet to an outlet of said housing, said baffles being constructed of a heat conducting material, wherein an exterior surface of one of said lower section and said lid is made of a heat conductive material, and wherein said baffles extract heat from an exhaust stream passing through said passages and conduct said heat to an exterior surface of said muffler.
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Accused Products
Abstract
A flow-through muffler includes a plurality of heat conducting walls, baffles, or partitions that together define a plurality of passages arranged to form acoustic waveguides, attenuators, and/or cancellation chambers, the walls, baffles, or partitions increasing a surface area exposed to the exhaust gases to facilitate extraction of heat while attenuating or canceling the resulting sound pressure waves. The muffler may have a cooling arrangement mounted thereon, and thermoelectric generator elements or other heat-powered device, such as a reformer, connected across the heat differential between the cooling arrangement and an exterior surface of the muffler housing that is in thermal contact with the heat conducting walls, bafflers, or partitions. In addition, the muffler may be made tuneable by providing a device for varying a length of one of the passages relative to another passage, and by including a sound cancellation chamber at an intersection of the passages. In addition, the internal surfaces of the muffler may be coated with a catalyst to provide a combination muffler and catalytic converter.
116 Citations
74 Claims
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1. A flow-through muffler, comprising:
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a housing including a lower section and a lid, a plurality of internal baffles arranged to form unobstructed flow-through passages extending from an inlet to an outlet of said housing, said baffles being constructed of a heat conducting material, wherein an exterior surface of one of said lower section and said lid is made of a heat conductive material, and wherein said baffles extract heat from an exhaust stream passing through said passages and conduct said heat to an exterior surface of said muffler. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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47. A muffler and thermoelectric generator device, comprising:
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a housing containing a plurality of heat-conducting baffles for extracting heat from an exhaust stream passing through the muffler and conducting the heat to an exterior surface of the muffler;
a plurality of thermal-electric generators in thermal contact with said exterior surface of the muffler. - View Dependent Claims (48, 49, 50, 51)
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- 52. A tuneable muffler, comprising an input, a cancellation chamber, and an output in communication with the cancellation chamber, and a plurality of passages having different lengths and extending between the input and the cancellation chamber, and further comprising an adjustment device for varying a length of at least one of said plurality of passages in order to vary a frequency of acoustic waves canceled in said cancellation chamber.
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72. A muffler and reformer device, comprising:
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a housing containing a plurality of heat-conducting baffles for extracting heat from an exhaust stream passing through the muffler and conducting the heat to an exterior surface of the muffler;
a reformer in thermal contact with said exterior surface of the muffler. - View Dependent Claims (73, 74)
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Specification