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:
Feb. 14, 2017
Filed:
Jun. 15, 2010
Bu Qiu, Nanjing, CN;
Dayan BI, Nanjing, CN;
Liliang Dou, Nanjing, CN;
Xiangcai Zeng, Nanjing, CN;
Chaojun Yang, Nanjing, CN;
Bu Qiu, Nanjing, CN;
Dayan Bi, Nanjing, CN;
Liliang Dou, Nanjing, CN;
Xiangcai Zeng, Nanjing, CN;
Chaojun Yang, Nanjing, CN;
A. O. SMITH CORPORATION, Milwaukee, WI (US);
Abstract
A gas water heater includes a water tank, a combustion chamber, a burner, a heat exchanger tube at least partially within the water tank, and a fan. The burner receives fuel gas and primary air from a first air-supply channel to create a primary air-fuel mixture for combustion in the combustion chamber with secondary air. The primary air-fuel mixture has a gas concentration above the upper explosive limit of the fuel gas. Secondary air is supplied through a second air-supply channel to the combustion chamber. The secondary air creates a low excess air ratio (e.g., below 1.5) for combustion in the combustion chamber. A totally sealed channel is defined from the air inlet of the fan to the heat exchanger tube.