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AssigneeWebasto AG Fahrzeugtechnik
InventorsKarl Panick, Friedrich Widemann, Hermann Schoenberger, Johann Sperl, Johann Sondermeier
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A heating device, particularly an automotive heating device, in which a noise muffling device is integrated within the heating device. The muffler can be provided in the combustion pipe defining the combustion chamber, or the combustion pipe, itself, can be designed as the muffler. The muffler operates by absorption and/or reflection sound muffling techniques in accordance with various embodiments, and may, simultaneously, purify the combustion gases, for example, by catalytic afterburning, and/or by filtering of soot particles. The muffler is arranged in a hot zone, but not in the flame area of the combustion chamber, to achieve a self-cleaning action. In other embodiments, noise muffling material is arranged in an exhaust gas collection chamber to achieve sound muffling based on reflection and/or absorption and/or other conventional sound reduction methods. In all cases, the need for an external muffler in the exhaust line from the heating device is eliminated.
In a heating device, particularly an automotive heating device, of a type having a burner and a cylindrical combustion chamber, defined by a combustion pipe, and a heat exchanger disposed concentrically about said combustion pipe, said burner being located at a first end of the combustion pipe and combustion gases exiting the combustion pipe through an opposite end thereof at which the flow of said combustion gases is reversed by a closed end of the heat exchanger so as to flow through the heat exchanger back toward the burner end of said combustion pipe within the heat exchanger, the improvement wherein a heat resistant, noise muffling material is integrated within a substantially flame-free zone of the combustion chamber of the heating device at which prevailing temperatures are sufficiently high to self-clean the muffling material of soot and other combustion generated substances.
In a heating device, particularly an automotive heating device, of a type having a burner and a cylindrical combustion chamber, defined by a combustion pipe, and a heat exchanger, having combustion gas channels, disposed concentrically about said combustion pipe, said burner being located at a first end of the combustion pipe and combustion gases exiting the combustion pipe through an opposite end thereof at which the flow of said combustion gases is reversed by a closed end of the heat exchanger so as to flow through said combustion gas channels of the heat exchanger back toward the burner end of said combustion pipe, the improvement wherein an exhaust gas collection chamber is positioned for receiving hot combustion gases exiting from the combustion gas channels;
Dependencies are inferred from the claim text.