Water heater
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United States of America Patent
Stats
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Sep 11, 2018
Grant Date -
Aug 27, 2015
app pub date -
Feb 11, 2015
filing date -
Feb 21, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A water heater capable of cooling a fan by inflow of air while suppressing backflow of combustion gas is provided. A fan includes: a fan case having a back surface wall; an impeller having a first blade and a second blade and housed in the fan case; a drive source rotating the impeller; and a rotation shaft coupling the impeller and the drive source through a through hole provided in the back surface wall. A gap through which air outside the fan case is suctioned into the fan case is provided between the rotation shaft and the back surface wall. The second blade faces the back surface wall without another member interposed therebetween throughout a range from an inner circumferential side to an outer circumferential side of the second plane.
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Family
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