The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 28, 2013
Filed:
Oct. 09, 2008
Jiro Fukudome, Osaka, JP;
Masataka Sugimoto, Amagasaki, JP;
Jiro Fukudome, Osaka, JP;
Masataka Sugimoto, Amagasaki, JP;
Yanmar Co., Ltd., Osaka-shi, JP;
Abstract
[Problems] Provided is a configuration in which a member is not interposed between exhaust gas and a partition wall of an engine coolant passage, and the exhaust gas is caused to directly collide with the partition wall of the engine coolant passage, thus raising the gas flow velocity in a heat exchange part, which enables further improving the exhaust heat recovery rate. [Means for Solving Problems] An engine exhaust gas heat recovery device () recovers heat from engine exhaust gas by performing heat exchange between the engine exhaust gas and engine coolant. A plurality of spray holes () facing an inner cylinder tube () of a coolant passage () have been provided in an outer tube () of an exhaust gas inflow tube (), and the exhaust gas is caused to directly collide with the inner cylinder tube () of the coolant passage (). A minimum distance from each of the spray holes () to the inner cylinder tube () of the coolant passage () is in a range of 1.5 to 7 times the diameter of the spray holes. A relationship between a total opening area of the spray holes () and an exhaust gas flow rate is (total spray hole area/exhaust gas mass flow rate)=2.0 to 4.5 (cm/(kg/min)).