US2019063464A1PendingUtilityA1
Engine cooling fans with uneven blade spacing
Est. expiryAug 31, 2037(~11.1 yrs left)· nominal 20-yr term from priority
F04D 29/668F04D 29/662F01P 5/02F04D 29/663F04D 29/38F04D 29/328F04D 29/666F04D 29/34
37
PatentIndex Score
0
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Claims
Abstract
Methods and systems are provided for a fan. In one example, a fan may include a plurality of blades separated by spacings. The spacing is one of a small blade spacing, a medium blade spacing, and a large blade spacing. The size as well as the arrangement of the small, medium, and the large blade spacings are determined by minimizing an imbalance force and pressure generated by the fan at a plurality of frequencies.
Claims
exact text as granted — not AI-modified1 . A fan, comprising:
a hub; and six blades disposed circumferentially around the hub with uneven spacings between adjacent blades, the spacings include two small blade spacings, two medium blade spacings, and two large blade spacings, wherein the medium blade spacing is smaller than the large blade spacing and larger than the small blade spacing.
2 . The fan of claim 1 , wherein the small blade spacing S is in a range of
360
6
-
δ
≤
S
≤
360
6
+
δ
2
,
the medium spacing M is in a range of
360
6
-
δ
2
<
M
<
360
6
+
δ
2
,
and the large spacing L is in a range of
360
6
+
δ
2
≤
L
≤
360
6
+
δ
,
wherein δ ∈(0,10].
3 . The fan of claim 1 , wherein the two small blade spacings are adjacent to each other.
4 . The fan of claim 3 , wherein the small blade spacing S, the medium blade spacing M, and the large blade spacing L are arranged in a sequence of MLSSML circumferentially around the hub without any other spacings therebetween.
5 . The fan of claim 1 , wherein the two small blade spacings are opposite to each other relative to the hub, the two medium blade spacings are opposite to each other relative to the hub, and the two large blade spacings are opposite to each other relative to the hub.
6 . The fan of claim 5 , wherein the small blade spacing, the medium blade spacing, and the large blade spacing are arranged in a sequence of MLSMLS circumferentially around the hub without any other spacings therebetween.
7 . A fan, comprising:
a hub; and seven blades disposed circumferentially around the hub with uneven spacings between adjacent blades, wherein the spacings include one medium blade spacing, at least two small blade spacings adjacent to each other, and at least two large blade spacings.
8 . The fan of claim 7 , wherein the small blade spacing S is in a range of
360
7
-
δ
≤
S
≤
360
7
+
δ
2
,
the medium spacing M is in a range of
360
7
-
δ
2
<
M
<
360
7
+
δ
2
,
and the large spacing L is in a range of
360
7
+
δ
2
≤
L
≤
360
7
+
δ
,
wherein δ ∈ (0,10].
9 . The fan of claim 7 , wherein the small blade spacing S, the medium blade spacing M, and the large blade spacing L are arranged in a sequence of SSLMSLL circumferentially around the hub without any other spacings therebetween.
10 . The fan of claim 7 , wherein the small blade spacing, the medium blade spacing, and the large blade spacing are arranged in a sequence of SSLMSSL circumferentially around the hub without any other spacings therebetween.
11 . A fan, comprising:
a hub; and eight blades disposed circumferentially around the hub with uneven spacings between adjacent blades, wherein the spacings include a plurality of small blade spacings S and a plurality of large blade spacings L arranged in the sequence of LLSSL circumferentially around the hub without any other spacings therebetween.
12 . The fan of claim 11 , wherein the small blade spacing S is in a range of
360
8
-
δ
≤
S
≤
360
8
+
δ
2
,
and the large spacing L is in a range of
360
8
+
δ
2
≤
L
≤
360
8
+
δ
,
wherein δ ∈ (0,10].
13 . The fan of claim 12 , further includes a medium blade spacing, the medium blade spacing smaller than the large blade spacing and larger than the small blade spacing, the medium spacing M is in a range of
360
8
-
0.8
δ
2
<
M
<
360
7
+
0.8
δ
2
.
14 . The fan of claim 13 , wherein the small blade spacing, the medium blade spacing, and the large blade spacing are arranged in a sequence of SMLLSSLM circumferentially around the hub without any other spacings therebetween.
15 . The fan of claim 11 , wherein the small blade spacing, the medium blade spacing, and the large blade spacing are arranged in a sequence of LSSLLSSL circumferentially around the hub without any other spacings therebetween.
16 . A fan, comprising:
a hub; and nine blades disposed circumferentially around the hub with uneven spacings between adjacent blades, wherein the spacings include a plurality of small blade spacings S and a plurality of large blade spacings L arranged in a sequence of LLSS circumferentially around the hub without any other spacings therebetween.
17 . The fan of claim 16 , further include one medium spacing M, the medium blade spacing smaller than the large blade spacing and larger than the small blade spacing, the medium spacing is in a range of
360
9
-
0.2
δ
2
<
M
<
360
9
+
0.2
δ
2
,
wherein δ ∈ (0,10].
18 . The fan of claim 16 , wherein the small blade spacing, the medium blade spacing, and the large blade spacing are arranged in a sequence of SSSLMSSLL circumferentially around the hub without any other spacings therebetween.
19 . The fan of claim 16 , wherein the small blade spacing, the medium blade spacing, and the large blade spacing are arranged in a sequence of LLSSMLLSS circumferentially around the hub without any other spacings therebetween.
20 . The fan of claim 16 , wherein the small blade spacing, the medium blade spacing, and the large blade spacing are arranged in a sequence of LSSLMLSSL circumferentially around the hub without any other spacings therebetween.Join the waitlist — get patent alerts
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