Centrifugal blower with asymmetric blade spacing
First Claim
Patent Images
1. A centrifugal blower, comprising:
- a motor having a number of pole passes, wherein the number of pole passes is an even number; and
thirty one impeller blades, wherein each of the thirty one impeller blades is associated with a nominal blade angle, the nominal blade angle being an angular displacement between adjacent impeller blades, wherein the thirty one blades are each spaced asymmetrically about a central hub such that a summation of the nominal blade angle values is equal to 360° and
an operating characteristic value of the centrifugal blower is deemed to be within a pre-determined range of operating characteristic values, wherein the first nominal blade angle value is 10.1034°
, the second nominal blade angle value is 10.0229°
;
the third nominal blade angle value is 13.1577°
;
the fourth nominal blade angle value is 13.2029°
;
the fifth nominal blade angle value is 13.6692°
;
the sixth nominal blade angle value is 13.0442°
;
the seventh nominal blade angle value is 13.5653°
;
the eighth nominal blade angle value is 11.9834°
;
the ninth nominal blade angle value is 11.6129°
;
the tenth nominal blade angle value is 10.1071°
;
the eleventh nominal blade angle value is 11.2424°
;
the twelfth nominal blade angle value is 10.1532°
;
the thirteenth nominal blade angle value is 10.1816°
;
the fourteenth nominal blade angle value is 9.7922°
;
the fifteenth nominal blade angle value is 13.4336°
;
the sixteenth nominal blade angle value is 13.6681°
;
the seventeenth nominal blade angle value is 12.6063°
;
the eighteenth nominal blade angle value is 9.5578°
;
the nineteenth nominal blade angle value is 10.0681°
;
the twentieth nominal blade angle value is 10.7533°
;
the twenty-first nominal blade angle value is 11.1850°
;
the twenty-second nominal blade angle value is 13.5670°
;
the twenty-third nominal blade angle value is 12.4725°
;
the twenty-fourth nominal blade angle value is 13.1224°
;
the twenty-fifth nominal blade angle value is 13.0726°
;
the twenty-sixth nominal blade angle value is 13.1187°
;
the twenty-seventh nominal blade angle value is 12.0408°
;
the twenty-eighth nominal blade angle value is 10.6195°
;
the twenty-ninth nominal blade angle value is 9.5566°
;
the thirtieth nominal blade angle value is 9.6588°
; and
the thirty-first nominal blade angle value is 9.6605°
.
1 Assignment
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Accused Products
Abstract
A centrifugal blower in a cooling system of an electronic device having asymmetrical blade spacing with acceptable balance. The asymmetrical blade spacing is determined according to a set of desired acoustic artifacts that are favorable and balance that is similar to that found with equal fan blade spacing. In one embodiment, the fan impeller can include thirty one fan blades. The perceived sound quality from the fan is improved with essentially no effect on the thermal performance of the fan.
13 Citations
2 Claims
-
1. A centrifugal blower, comprising:
-
a motor having a number of pole passes, wherein the number of pole passes is an even number; and thirty one impeller blades, wherein each of the thirty one impeller blades is associated with a nominal blade angle, the nominal blade angle being an angular displacement between adjacent impeller blades, wherein the thirty one blades are each spaced asymmetrically about a central hub such that a summation of the nominal blade angle values is equal to 360° and
an operating characteristic value of the centrifugal blower is deemed to be within a pre-determined range of operating characteristic values, wherein the first nominal blade angle value is 10.1034°
, the second nominal blade angle value is 10.0229°
;
the third nominal blade angle value is 13.1577°
;
the fourth nominal blade angle value is 13.2029°
;
the fifth nominal blade angle value is 13.6692°
;
the sixth nominal blade angle value is 13.0442°
;
the seventh nominal blade angle value is 13.5653°
;
the eighth nominal blade angle value is 11.9834°
;
the ninth nominal blade angle value is 11.6129°
;
the tenth nominal blade angle value is 10.1071°
;
the eleventh nominal blade angle value is 11.2424°
;
the twelfth nominal blade angle value is 10.1532°
;
the thirteenth nominal blade angle value is 10.1816°
;
the fourteenth nominal blade angle value is 9.7922°
;
the fifteenth nominal blade angle value is 13.4336°
;
the sixteenth nominal blade angle value is 13.6681°
;
the seventeenth nominal blade angle value is 12.6063°
;
the eighteenth nominal blade angle value is 9.5578°
;
the nineteenth nominal blade angle value is 10.0681°
;
the twentieth nominal blade angle value is 10.7533°
;
the twenty-first nominal blade angle value is 11.1850°
;
the twenty-second nominal blade angle value is 13.5670°
;
the twenty-third nominal blade angle value is 12.4725°
;
the twenty-fourth nominal blade angle value is 13.1224°
;
the twenty-fifth nominal blade angle value is 13.0726°
;
the twenty-sixth nominal blade angle value is 13.1187°
;
the twenty-seventh nominal blade angle value is 12.0408°
;
the twenty-eighth nominal blade angle value is 10.6195°
;
the twenty-ninth nominal blade angle value is 9.5566°
;
the thirtieth nominal blade angle value is 9.6588°
; and
the thirty-first nominal blade angle value is 9.6605°
. - View Dependent Claims (2)
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Current AssigneeApple Inc.
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Original AssigneeApple Inc.
-
InventorsDuke, Connor R., Dybenko, Jesse T.
-
Primary Examiner(s)Kramer, Devon
-
Assistant Examiner(s)Hamo, Patrick
-
Application NumberUS13/598,585Publication NumberTime in Patent Office1,000 DaysField of Search416/175, 416/203, 416/500, 415/119US Class Current417/423.1CPC Class CodesF04D 29/281 for fans or blowersF04D 29/666 by means of rotor construct...
