Fan and water heater provided with the same, and impeller and water heater provided with the same
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United States of America Patent
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Apr 3, 2018
Issued Date -
N/A
app pub date -
Feb 11, 2015
filing date -
Feb 24, 2014
priority date (Note) -
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Abstract
A fan includes: an impeller including a main plate having a first plane, a plurality of first blades each formed the first plane, and a shroud formed integrally with the plurality of first blades; a fan case; a drive source; and a rotation shaft. The first blades each include a linearly protruding region that is linearly increased in height from an outer circumferential side to an inner circumferential side, and a curvedly protruding region that is curvedly increased in height from the outer circumferential side to the inner circumferential side, the height extending in a direction in which each first blade protrudes. The linearly protruding region is welded to the main plate. Accordingly, a highly durable fan can be implemented that allows sufficient durability to be maintained even under a high temperature environment or an acid environment.
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