Low-noise blower
First Claim
Patent Images
1. A blower comprising:
- an impeller comprising;
an impeller plate; and
a plurality of blades each attached to the impeller plate and comprising a tip and a leading surface that comprises a first portion proximate to the tip, the first portion having a first radius; and
a housing comprising;
an impeller cavity, wherein the impeller plate is disposed within the impeller cavity;
a collector; and
a slot between the impeller cavity and the collector, the slot having an upper edge and a lower edge each comprising a second radius, wherein the upper and lower edges of the slot each comprise a respective inclined surface extending from the respective edge toward the collector and an inside rounded corner nearest the impeller, the inclined surfaces disposed relative to each other at an angle within a range of 10-40 degrees such that a distance between the inclined surfaces increases as the inclined surfaces extend away from the impeller.
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Abstract
A low-noise blower has an impeller with an impeller plate and a plurality of blades each attached to the impeller plate. Each blade has a tip and a leading surface with a first portion that is proximate to the tip and has a first radius that is within a range of 0.03-0.20 inch.
98 Citations
20 Claims
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1. A blower comprising:
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an impeller comprising; an impeller plate; and a plurality of blades each attached to the impeller plate and comprising a tip and a leading surface that comprises a first portion proximate to the tip, the first portion having a first radius; and a housing comprising; an impeller cavity, wherein the impeller plate is disposed within the impeller cavity; a collector; and a slot between the impeller cavity and the collector, the slot having an upper edge and a lower edge each comprising a second radius, wherein the upper and lower edges of the slot each comprise a respective inclined surface extending from the respective edge toward the collector and an inside rounded corner nearest the impeller, the inclined surfaces disposed relative to each other at an angle within a range of 10-40 degrees such that a distance between the inclined surfaces increases as the inclined surfaces extend away from the impeller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An impeller comprising:
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an impeller plate having an outside edge with a first radius; and a plurality of blades attached to the impeller plate, the plurality of blades comprising a first set of blades each comprising an inducer and a second set of blades without inducers, each of the plurality of blades comprising; a tip at the outside edge; a convex leading surface having a first portion extending from the tip and a second portion extending from the first portion with a second radius; and a concave trailing surface that terminates at the tip and has a minimum radius that is greater than the second radius, wherein the blade is solid from the convex leading surface to the concave trailing surface. - View Dependent Claims (16, 17, 18)
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19. An impeller comprising:
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an impeller plate having an outside edge with a first radius; and a plurality of blades attached to the impeller plate, each of the plurality of blades comprising; a tip coincident with the outside edge; a convex leading surface extending from the tip and comprising (i) a first portion proximate to the tip and having a second radius, and (ii) a second portion disposed between the tip and the first portion and having the first radius; and a concave trailing surface extending from the tip with a third radius, the third radius greater than the second radius, wherein the blade is solid from the convex leading surface to the concave trailing surface. - View Dependent Claims (20)
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Specification