# US 9,039,363 B2 · Blower housing

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- Number: US 9,039,363 B2
- Document ID: US9039363B2
- Status: Granted
- Kind: B2
- Application number: 13/530,823
- Filed: 2012-06-22
- Published: 2013-12-26
- Granted: 2015-05-26
- Earliest claimed: 2012-06-22
- Assignees: Trane International Inc.
- Applicants: Stephen S. Hancock
- Inventors: Stephen S. Hancock
- Web page: https://patentgrep.com/patent/US9039363B2

## CPC

- F04D 29/424: {Double entry casings}
- F04D 17/10: for compressing or evacuating
- F04D 29/4226: {Fan casings}
- F04D 29/441: {especially adapted for elastic fluid pumps}
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)

## Abstract

A blower housing has a discharge direction, an axis of rotation, a polar axis that intersects the axis of rotation and is substantially perpendicular to the discharge direction, and an angular sweep of increasing fluid flow area. The fluid flow area, A, increases with increasing angular magnitude, Φ, as a function comprising at least a functional component that is at least one of (1) equal to, (2) substantially mathematically reducible to, and (3) substantially mathematically analogous to the equation, A ⁡ ( Φ ) = A co + R ( 1 - 1 - [ ( r i ) ⁢ ( Φ ) R ] 2 ) , where Aco is a minimum fluid flow area, R is a radius of a first circle, and ri is a radius of a second circle that is smaller than the first circle.

## Claims

### Claim 1

A blower housing, comprising:
a discharge direction;
an axis of rotation;
a polar axis that intersects the axis of rotation and is substantially perpendicular to the discharge direction; and
an angular sweep of increasing fluid flow area, wherein the fluid flow area, A, increases with increasing angular magnitude, Φ, as a function comprising at least a functional component that is at least one of (1) equal to, (2) substantially mathematically reducible to, and (3) substantially mathematically analogous to the equation,
A
⁡
(
Φ
)
=
A
co
+
R
(
1
-
1
-
[
(
r
i
)
⁢
(
Φ
)
R
]
2
)
,
wherein Aco is a minimum fluid flow area, R is a radius of a first circle, and ri is a radius of a second circle that is smaller than the first circle.

### Claim 2 (depends on 1)

The blower housing of claim 1, wherein the angular sweep extends over about 300 degrees.

### Claim 3 (depends on 1)

The blower housing of claim 1, wherein the angular sweep begins at about 90 degrees as measured from the polar axis.

### Claim 4 (depends on 1)

The blower housing of claim 1, wherein the angular sweep ends at about 365 degrees as measured from the polar axis.

### Claim 5 (depends on 1)

The blower housing of claim 1, wherein the fluid flow area comprises a cross-sectional area measured between the axis of rotation and an inner wall of the blower housing.

### Claim 6 (depends on 1)

The blower housing of claim 1, wherein the fluid flow area is increased by increasing a distance between the axis of rotation and a radial wall of the blower housing.

### Claim 7 (depends on 1)

The blower housing of claim 1, wherein the fluid flow area is increased by axially expanding a sidewall of the blower housing.

### Claim 8 (depends on 1)

The blower housing of claim 1, wherein the housing comprises an axial contraction between the angular sweep and a discharge of the blower housing.

### Claim 9 (depends on 1)

The blower housing of claim 1, wherein the angular sweep extends to a discharge of the blower housing.

### Claim 10 (depends on 1)

The blower housing of claim 1, wherein the angular sweep is angularly separated from each of a cutoff of the blower housing and a discharge of the blower housing.

### Claim 11

A method of moving air, comprising:
receiving fluid into a centrifugal blower; and
moving the fluid along an angular path of increasing fluid flow area, wherein the fluid flow area, A, increases with increasing angular magnitude, Φ, as a function comprising at least a functional component that is at least one of (1) equal to, (2) substantially mathematically reducible to, and (3) substantially mathematically analogous to the equation,
A
⁡
(
Φ
)
=
A
co
+
R
(
1
-
1
-
[
(
r
i
)
⁢
(
Φ
)
R
]
2
)
,
and wherein Aco is a minimum fluid flow area, R is a radius of a first circle, and ri is a radius of a second circle that is smaller than the first circle.

### Claim 12 (depends on 11)

The method of claim 11, wherein the angular path of increasing fluid flow area comprises about 300 degrees.

### Claim 13 (depends on 11)

The method of claim 11, further comprising discharging the fluid in an airflow direction that is substantially tangential to an axis of rotation of the centrifugal blower, the fluid being discharged via a discharge of the centrifugal blower that extends to about 90 degrees.

### Claim 14 (depends on 11)

The method of claim 11, wherein the increasing fluid flow area comprises an increasing axial dimension of a sidewall of the centrifugal blower.

### Claim 15 (depends on 11)

The method of claim 11, wherein the increasing fluid flow area comprises increasing a radial dimension of a radial wall of the centrifugal blower.

### Claim 16

A centrifugal blower housing, comprising:
a first sidewall comprising a first inlet;
a second sidewall substantially opposite the first sidewall, the second sidewall comprising a second inlet;
a radial wall joining the first sidewall to the second sidewall, the radial wall comprising a discharge;
a discharge direction; and
a polar axis that intersects an axis of rotation of the blower housing and extends substantially perpendicular to the discharge direction;
wherein a fluid flow area, A, of the blower housing is increased with increasing angular position, Φ, over a first angular sweep as a function comprising at least a functional component that is at least one of (1) equal to, (2) substantially mathematically reducible to, and (3) substantially mathematically analogous to the equation,
A
⁡
(
Φ
)
=
A
co
+
R
(
1
-
1
-
[
(
r
i
)
⁢
(
Φ
)
R
]
2
)
,
wherein Aco is a minimum fluid flow area, R is a radius of a first circle, and ri is a radius of a second circle that is smaller than the first circle.

### Claim 17 (depends on 16)

The centrifugal blower housing of claim 16, wherein the first angular sweep is about 300 degrees.

### Claim 18 (depends on 16)

The centrifugal blower housing of claim 16, wherein the first angular sweep begins at about 90 degrees.

### Claim 19 (depends on 16)

The centrifugal blower housing of claim 16, wherein the first angular sweep is angularly adjacent a second angular sweep that does not expand as a function comprising at least a functional component that is at least one of (1) equal to, (2) substantially mathematically reducible to, and (3) substantially mathematically analogous to the equation,
A
⁡
(
Φ
)
=
A
co
+
R
(
1
-
1
-
[
(
r
i
)
⁢
(
Φ
)
R
]
2
)
.

### Claim 20 (depends on 19)

The centrifugal blower housing of claim 19, wherein the second angular sweep is angularly offset from at least one of the first angular sweep and the discharge.