US 12,025,146 B2Granted

Blade rotor and fluid working machine comprising such a rotor

AssigneeFpz S.P.A.

InventorsAndrea Lazari, Andrea Cattanei, Sergio Ettore Ferigo

Life of this patent

Estimating the term…

Abstract

A fluid working machine comprises a rotor (7) with a blading (10) comprising 40 to 65 blades that radially project out of a body central and are suitably circumferentially offset on a plane normal to the axis of symmetry of the rotor, according to an appropriate spacing rule that can eliminate or appreciably attenuate the acoustic emission components that are mostly annoying to the human ear or at frequencies close to the resonance frequencies of other parts of the working machine.

Claims12

Dependent claims

A rotor of a fluid working machine comprising a central body with a first plurality of peripheral elements, extending radially therefrom, wherein:

the peripheral elements of said first plurality of peripheral elements are circumferentially arranged in offset positions on a plane normal to the axis of symmetry of the rotor;
said first plurality of peripheral elements comprises such a number Z of peripheral elements as to satisfy the following relation 40≤Z≤65 and
said Z peripheral elements are circumferentially arranged pitchwise around the central body of said rotor in an unequally spaced arrangement, resulting in
Δαm=(1+xm)Δα0 with m=1, . . . ,z−1,
wherein:
Δ
⁢
α
0
=
360
⁢
°
z
stands for the constant offset angle of an equally spaced arrangement;
x
m
=
Δ
⁢
α
m
Δ
⁢
α
0
-
1
and m=1, . . . , z−1 constitute non-uniformity factors for quantifying the relative deviation of peripheral elements of the rotor with respect to an equally spaced arrangement,
a minimum non-uniformity factor Xmin=|minm=1, . . . , z(xm)| and a maximum non-uniformity factor Xmax=maxm=1, . . . , z(xm) can be found in said arrangement of said z peripheral elements of the rotor, corresponding to the minimum and maximum possible non-uniformity factors respectively, whereby a Δαmin=(1−Xmin)Δα0 and a Δαmax=(1+Xmax)Δα0 can be defined, corresponding to a minimum angular distance and a maximum angular distance that can be found in said distribution of said Z peripheral elements respectively, so that by dividing the range Δαmin−Δαmax into i=1, 2, 3, . . . , 10 intervals having an equal amplitude of
δ
⁢
α
=
x
max
+
x
min
10
⁢
Δ
⁢
α
0
,
the number of angular distances Δαm between contiguous peripheral elements in the range i−th whose amplitude is δα, ranges from
a minimum:
zimin=int((z−1)pimin) to
a maximum:
zimax=int((z−1)pimax)+1
as determined from pimin and pimax which are minimum and maximum percentages and based on a total number of elements minus one, Z−1, where int(x) represents an integer part function and pimin and pimax are given by:
I) if Xmax=Xmin
0 < Xmin <
0.25 ≤
0.25
Xmin < 0.35
i
Range
pimin
pimax
pimin
pimax
1
Δαmin
Δα0 −
4.6%
7.2%
4.6%
7.2%
4δα
2
Δα0 −
Δα0 −
12.2%
19.1%
7.6%
12.0%
4δα
3δα
3
Δα0 −
Δα0 −
10.7%
16.7%
6.1%
9.6%
3δα
2δα
4
Δα0 −
Δα0 −
3.1%
4.8%
7.6%
12.0%
2δα
δα
5
Δα0 −
Δα0
10.7%
16.7%
10.7%
16.7%
δα
6
Δα0
Δα0 +
7.6%
12.0%
15.3%
23.9%
δα
7
Δα0 +
Δα0 +
4.6%
7.2%
9.2%
14.4%
δα
2δα
8
Δα0 +
Δα0 +
6.1%
9.6%
3.1%
4.8%
2δα
3δα
9
Δα0 +
Δα0 +
10.7%
16.7%
6.1%
9.6%
3δα
4δα
10
Δα0 +
Δαmax
7.6%
12.0%
7.6%
12.0%
4δα
0.35 ≤ Xmin < 0.45
0.45 ≤ Xmin < 1
i
pimin
pimax
pimin
pimax
1
1.5%
2.4%
5.8%
13.8%
2
4.6%
7.2%
1.8%
7.9%
3
9.2%
14.4%
5.8%
9.9%
4
9.2%
14.4%
11.7%
19.7%
5
10.7%
16.7%
13.7%
21.6%
6
18.4%
28.7%
10.7%
16.7%
7
10.7%
16.7%
5.8%
9.9%
8
6.1%
9.6%
1.9%
7.9%
9
1.5%
7.2%
5.8%
9.9%
10
6.1%
9.6%
5.8%
13.8%.
II)
if
⁢
X
max
≠
X
min
,
with
X
max
=
29
11
⁢
X
min
=
if
0
<
X
min
<
0.25
X
max
=
7
3
⁢
X
min
if
0.25
≤
X
min
<
0.35
X
max
=
2
⁢
X
min
if
0.35
≤
X
min
<
0.45
X
max
=
8
5
⁢
X
min
if
0.45
≤
X
min
<
1
by
0 < Xmin <
0.25 ≤
0.25
Xmin < 0.35
i
Range
pimin
pimax
pimin
pimax
1
Δαmin
Δα0 −
17.6%
29.5%
15.6%
29.6%
4δα
2
Δα0 −
Δα0 −
25.4%
33.4%
9.8%
15.7%
4δα
3δα
3
Δα0 −
Δα0 −
5.8%
11.8%
9.8%
15.7%
3δα
2δα
4
Δα0 −
Δα0 −
1.8%
7.9%
13.6%
25.5%
2δα
δα
5
Δα0 −
Δα0
3.9%
9.9%
9.8%
15.7%
δα
6
Δα0
Δα0 +
3.9%
9.9%
5.8%
11.8%
δα
7
Δα0 +
Δα0 +
9.8%
15.7%
1.8%
7.9%
δα
2δα
8
Δα0 +
Δα0 +
1.8%
7.9%
1.8%
9.9%
2δα
3δα
9
Δα0 +
Δα0 +
1.8%
7.9%
1.8%
7.9%
3δα
4δα
10
Δα0 +
Δαmax
1.8%
5.9%
1.8%
9.9%
4δα
0.35 ≤ Xmin < 0.45
0.45 ≤ Xmin < 1
i
pimin
pimax
pimin
pimax
1
15.3%
23.9%
9.8%
17.7%
2
13.5%
21.6%
11.7%
19.7%
3
7.8%
15.7%
9.8%
17.7%
4
9.8%
17.7%
11.7%
21.6%
5
7.6%
15.7%
5.8%
13.8%
6
9.8%
19.7%
5.8%
11.8%
7
1.8%
7.9%
9.8%
17.7%
8
1.5%
5.9%
1.9%
7.9%
9
1.5%
5.9%
1.5%
5.9%
10
1.5%
5.9%
1.5%
5.9%.
or alternatively by
0 < Xmin <
0.25 ≤
0.25
Xmin < 0.35
i
Range
pimin
pimax
pimin
pimax
1
Δαmin
Δα0 −
22.7%
28.3%
21.4%
29.6%
4δα
2
Δα0 −
Δα0 −
26.2%
32.6%
9.9%
13.6%
4δα
3δα
3
Δα0 −
Δα0 −
8.7%
10.9%
9.9%
13.6%
3δα
2δα
4
Δα0 −
Δα0 −
3.5%
4.4%
18.1%
25.0%
2δα
δα
5
Δα0 −
Δα0
7.0%
8.7%
9.9%
13.6%
δα
6
Δα0
Δα0 +
7.0%
8.7%
8.2%
11.4%
δα
7
Δα0 +
Δα0 +
12.2%
15.2%
3.3%
4.5%
δα
2δα
8
Δα0 +
Δα0 +
1.8%
4.4%
1.8%
4.5%
2δα
3δα
9
Δα0 +
Δα0 +
1.8%
4.4%
1.8%
4.4%
3δα
4δα
10
Δα0 +
Δαmax
1.8%
4.0%
1.8%
2.3%
4δα
0.35 ≤ Xmin < 0.45
0.45 ≤ Xmin < 1
i
pimin
pimax
pimin
pimax
1
15.3%
23.9%
10.7%
16.7%
2
13.8%
21.5%
12.2%
19.1%
3
9.2%
14.4%
10.7%
16.7%
4
10.7%
16.7%
12.2%
19.1%
5
7.6%
12.0%
7.6%
12.0%
6
12.2%
19.1%
6.1%
9.6%
7
4.6%
7.2%
10.7%
16.7%
8
1.5%
4.5%
1.5%
4.8%
9
1.5%
4.5%
1.5%
4.8%
10
1.5%
4.5%
1.3%
4.8%.

581 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/261,953Filed 6 Aug 2019
Priority: EP 181880908 Aug 2018
Published: US 2021/0301830 A130 Sep 2021
Granted: 2 Jul 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification21 codes

F04D 29/281
For centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps: for fans or blowers
F01D 5/04
Blade-carrying members, e.g. rotors: for radial-flow machines or engines
F01D 5/048
Of the axial inlet- radial outlet, or vice versa, type: form or construction
F01D 5/10
Blade-carrying members, e.g. rotors: anti- vibration means

Family

US 2021/0301830 A1Pre-grant publication · published 30 Sep 2021
US 12,025,146 B2This patent

From the US filing history. Foreign family members aren’t listed.

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Abstract

A rotor of a fluid working machine comprising a central body with a first plurality of peripheral elements, extending radially therefrom, wherein:

the peripheral elements of said first plurality of peripheral elements are circumferentially arranged in offset positions on a plane normal to the axis of symmetry of the rotor;
said first plurality of peripheral elements comprises such a number Z of peripheral elements as to satisfy the following relation 40≤Z≤65 and
said Z peripheral elements are circumferentially arranged pitchwise around the central body of said rotor in an unequally spaced arrangement, resulting in
Δαm=(1+xm)Δα0 with m=1, . . . ,z−1,
wherein:
Δ
⁢
α
0
=
360
⁢
°
z
stands for the constant offset angle of an equally spaced arrangement;
x
m
=
Δ
⁢
α
m
Δ
⁢
α
0
-
1
and m=1, . . . , z−1 constitute non-uniformity factors for quantifying the relative deviation of peripheral elements of the rotor with respect to an equally spaced arrangement,
a minimum non-uniformity factor Xmin=|minm=1, . . . , z(xm)| and a maximum non-uniformity factor Xmax=maxm=1, . . . , z(xm) can be found in said arrangement of said z peripheral elements of the rotor, corresponding to the minimum and maximum possible non-uniformity factors respectively, whereby a Δαmin=(1−Xmin)Δα0 and a Δαmax=(1+Xmax)Δα0 can be defined, corresponding to a minimum angular distance and a maximum angular distance that can be found in said distribution of said Z peripheral elements respectively, so that by dividing the range Δαmin−Δαmax into i=1, 2, 3, . . . , 10 intervals having an equal amplitude of
δ
⁢
α
=
x
max
+
x
min
10
⁢
Δ
⁢
α
0
,
the number of angular distances Δαm between contiguous peripheral elements in the range i−th whose amplitude is δα, ranges from
a minimum:
zimin=int((z−1)pimin) to
a maximum:
zimax=int((z−1)pimax)+1
as determined from pimin and pimax which are minimum and maximum percentages and based on a total number of elements minus one, Z−1, where int(x) represents an integer part function and pimin and pimax are given by:
I) if Xmax=Xmin
0 < Xmin <
0.25 ≤
0.25
Xmin < 0.35
i
Range
pimin
pimax
pimin
pimax
1
Δαmin
Δα0 −
4.6%
7.2%
4.6%
7.2%
4δα
2
Δα0 −
Δα0 −
12.2%
19.1%
7.6%
12.0%
4δα
3δα
3
Δα0 −
Δα0 −
10.7%
16.7%
6.1%
9.6%
3δα
2δα
4
Δα0 −
Δα0 −
3.1%
4.8%
7.6%
12.0%
2δα
δα
5
Δα0 −
Δα0
10.7%
16.7%
10.7%
16.7%
δα
6
Δα0
Δα0 +
7.6%
12.0%
15.3%
23.9%
δα
7
Δα0 +
Δα0 +
4.6%
7.2%
9.2%
14.4%
δα
2δα
8
Δα0 +
Δα0 +
6.1%
9.6%
3.1%
4.8%
2δα
3δα
9
Δα0 +
Δα0 +
10.7%
16.7%
6.1%
9.6%
3δα
4δα
10
Δα0 +
Δαmax
7.6%
12.0%
7.6%
12.0%
4δα
0.35 ≤ Xmin < 0.45
0.45 ≤ Xmin < 1
i
pimin
pimax
pimin
pimax
1
1.5%
2.4%
5.8%
13.8%
2
4.6%
7.2%
1.8%
7.9%
3
9.2%
14.4%
5.8%
9.9%
4
9.2%
14.4%
11.7%
19.7%
5
10.7%
16.7%
13.7%
21.6%
6
18.4%
28.7%
10.7%
16.7%
7
10.7%
16.7%
5.8%
9.9%
8
6.1%
9.6%
1.9%
7.9%
9
1.5%
7.2%
5.8%
9.9%
10
6.1%
9.6%
5.8%
13.8%.
II)
if
⁢
X
max
≠
X
min
,
with
X
max
=
29
11
⁢
X
min
=
if
0
<
X
min
<
0.25
X
max
=
7
3
⁢
X
min
if
0.25
≤
X
min
<
0.35
X
max
=
2
⁢
X
min
if
0.35
≤
X
min
<
0.45
X
max
=
8
5
⁢
X
min
if
0.45
≤
X
min
<
1
by
0 < Xmin <
0.25 ≤
0.25
Xmin < 0.35
i
Range
pimin
pimax
pimin
pimax
1
Δαmin
Δα0 −
17.6%
29.5%
15.6%
29.6%
4δα
2
Δα0 −
Δα0 −
25.4%
33.4%
9.8%
15.7%
4δα
3δα
3
Δα0 −
Δα0 −
5.8%
11.8%
9.8%
15.7%
3δα
2δα
4
Δα0 −
Δα0 −
1.8%
7.9%
13.6%
25.5%
2δα
δα
5
Δα0 −
Δα0
3.9%
9.9%
9.8%
15.7%
δα
6
Δα0
Δα0 +
3.9%
9.9%
5.8%
11.8%
δα
7
Δα0 +
Δα0 +
9.8%
15.7%
1.8%
7.9%
δα
2δα
8
Δα0 +
Δα0 +
1.8%
7.9%
1.8%
9.9%
2δα
3δα
9
Δα0 +
Δα0 +
1.8%
7.9%
1.8%
7.9%
3δα
4δα
10
Δα0 +
Δαmax
1.8%
5.9%
1.8%
9.9%
4δα
0.35 ≤ Xmin < 0.45
0.45 ≤ Xmin < 1
i
pimin
pimax
pimin
pimax
1
15.3%
23.9%
9.8%
17.7%
2
13.5%
21.6%
11.7%
19.7%
3
7.8%
15.7%
9.8%
17.7%
4
9.8%
17.7%
11.7%
21.6%
5
7.6%
15.7%
5.8%
13.8%
6
9.8%
19.7%
5.8%
11.8%
7
1.8%
7.9%
9.8%
17.7%
8
1.5%
5.9%
1.9%
7.9%
9
1.5%
5.9%
1.5%
5.9%
10
1.5%
5.9%
1.5%
5.9%.
or alternatively by
0 < Xmin <
0.25 ≤
0.25
Xmin < 0.35
i
Range
pimin
pimax
pimin
pimax
1
Δαmin
Δα0 −
22.7%
28.3%
21.4%
29.6%
4δα
2
Δα0 −
Δα0 −
26.2%
32.6%
9.9%
13.6%
4δα
3δα
3
Δα0 −
Δα0 −
8.7%
10.9%
9.9%
13.6%
3δα
2δα
4
Δα0 −
Δα0 −
3.5%
4.4%
18.1%
25.0%
2δα
δα
5
Δα0 −
Δα0
7.0%
8.7%
9.9%
13.6%
δα
6
Δα0
Δα0 +
7.0%
8.7%
8.2%
11.4%
δα
7
Δα0 +
Δα0 +
12.2%
15.2%
3.3%
4.5%
δα
2δα
8
Δα0 +
Δα0 +
1.8%
4.4%
1.8%
4.5%
2δα
3δα
9
Δα0 +
Δα0 +
1.8%
4.4%
1.8%
4.4%
3δα
4δα
10
Δα0 +
Δαmax
1.8%
4.0%
1.8%
2.3%
4δα
0.35 ≤ Xmin < 0.45
0.45 ≤ Xmin < 1
i
pimin
pimax
pimin
pimax
1
15.3%
23.9%
10.7%
16.7%
2
13.8%
21.5%
12.2%
19.1%
3
9.2%
14.4%
10.7%
16.7%
4
10.7%
16.7%
12.2%
19.1%
5
7.6%
12.0%
7.6%
12.0%
6
12.2%
19.1%
6.1%
9.6%
7
4.6%
7.2%
10.7%
16.7%
8
1.5%
4.5%
1.5%
4.8%
9
1.5%
4.5%
1.5%
4.8%
10
1.5%
4.5%
1.3%
4.8%.

581 more elements

Facts

Application

17/261,953Filed 6 Aug 2019

Priority

EP 181880908 Aug 2018

Published

US 2021/0301830 A130 Sep 2021

Granted

2 Jul 2024

Term ends

Not estimatedThe source records don’t support an estimate.

Classification21 codes

F04D 29/281
For centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps: for fans or blowers
F01D 5/04
Blade-carrying members, e.g. rotors: for radial-flow machines or engines
F01D 5/048
Of the axial inlet- radial outlet, or vice versa, type: form or construction
F01D 5/10
Blade-carrying members, e.g. rotors: anti- vibration means