Housing for an axial fan

Patent metadata

Field	Value
Publication number	US-10107306-B2
Application number	US-201314433913-A
Country	US
Kind code	B2
Filing date	Apr 12, 2013
Priority date	Oct 8, 2012
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

A housing for a fan or blower, in particular an axial fan, includes a wall ring ( 2 ) having an inlet nozzle section ( 3 ), an outer diffuser ( 6 ) having an inlet flow opening ( 7 ) and an outlet flow opening ( 8 ), and a holder for an electric motor ( 9 ) of the fan. The holder is arranged in an inner space of the housing. The outer diffuser ( 6 ) is formed by at least two partial ring sections that are connected to the outer circumferential surface via mechanical connection elements. The holder includes several struts ( 14 ) that are fastened to an inner circumferential surface of the outer diffuser ( 6 ) by one end, are circumferentially spaced apart, and are fastened in the edge region of the inlet flow opening ( 7 ). The struts can be installed by their other end to a motor flange ( 16 ) of the motor housing ( 17 ) of the electric motor ( 9 ).

First claim

What is claimed is:

1. A housing for an axial fan ( 1 ), comprising
a wall ring ( 2 ) with an inlet nozzle section ( 3 ) and an outflow side, the wall ring ( 2 ) configured for surrounding a blade wheel,
an annular outer diffuser ( 6 ) connected to the wall ring ( 2 ) on the outflow side of the wall ring ( 2 ),
a holder for an electric motor ( 9 ) of the axial fan ( 1 ), the holder being arranged in an inner space of the housing,
an inner diffuser ( 26 ) arranged inside the outer diffuser ( 6 ),
a motor housing ( 17 ) of the electric motor ( 9 ) disposed inside the inner diffuser ( 26 ), and
a protective grid ( 36 ) being fastened to the outer diffuser ( 6 ),
wherein the outer diffuser ( 6 ) having an inlet flow opening ( 7 ) and an outlet flow opening ( 8 ) and being formed from at least two partial ring sections ( 12 ), which are connected via mechanical connecting elements ( 13 ) on an outer circumferential surface of the outer diffusor ( 6 ), the outer diffusor ( 6 ) widening conically from the inlet flow opening ( 7 ) toward the outlet flow opening ( 8 ) at a cone angle (α) with respect to a central longitudinal axis (X-X), and
the holder being formed of several struts ( 14 ) to be fastened to an inner circumferential surface of the outer diffuser ( 6 ) at first strut ends, the struts ( 14 ) being circumferentially spaced apart and fastened at the first strut ends in an edge region of the inlet flow opening ( 7 ), the struts ( 14 ) being configured to be installed to a motor flange ( 16 ) of the motor housing ( 17 ) of the electric motor ( 9 ) at second strut ends opposite the first strut ends,
the inner diffuser ( 26 ) axially extending from the inlet flow opening ( 7 ) to the outlet flow opening ( 8 ) of the outer diffuser ( 6 ) and having a closed circumferential wall ( 27 ), the inner diffuser ( 26 ) configured to be connected near the inlet flow opening ( 7 ) to the motor flange ( 16 ) of the motor housing ( 17 ), wherein the motor housing ( 17 ) is disposed axially between the protective grid and the wall ring ( 2 ),
the protective grid ( 36 ) being fastened in an opening plane of the outlet flow opening ( 8 ) of the outer diffuser ( 6 ), the opening plane running perpendicular to the central longitudinal axis (X-X) and axially spaced from the motor housing, the protective grid ( 36 ) being connected to the outer diffuser ( 6 ) by an outer circumferential edge ( 37 ),
wherein the outer diffuser ( 6 ) has recesses ( 41 ) in a circumferential wall near the outlet flow opening ( 8 ) for accommodating grid wires ( 38 ) of the protective grid ( 36 ) and wall surfaces ( 31 ) of the inner diffuser ( 26 ) have recesses ( 44 ) at a free end in the edge region to accommodate the grid wires ( 38 ), and
wherein the inner diffuser ( 26 ) has an end cover ( 43 ), covering a central portion of the protective grid ( 36 ) on a side facing the outflow direction, the end cover connected to an air guiding section ( 29 ) of the inner diffuser via fastening elements in such a way that the protective grid ( 36 ) is axially enclosed between the end cover ( 43 ) and the air guiding section ( 29 ).

2. The housing according to claim 1 , wherein the outer diffuser ( 6 ) is formed from four partial ring sections ( 12 ).

3. The housing according to claim 1 , wherein the struts are four spaced apart struts ( 14 ), each comprising two parallel spokes.

4. The housing according to claim 1 , wherein the inlet flow opening ( 7 ) and the outlet flow opening ( 8 ) of the outer diffuser ( 6 ) are circular in cross section and wherein the cone angle (a) with respect to the central longitudinal axis (X-X) is 10° to 18°.

5. The housing according to claim 1 , wherein the outer diffuser ( 6 ) is made of plastic.

6. The housing according to claim 1 , further comprising the blade wheel ( 11 ) with fan blades arranged in the wall ring ( 2 ), wherein the outer diffuser ( 6 ) has a height (L) measured along the central longitudinal axis (X-X) above the fan blades, the height (L) being greater than or equal to 200 mm to including 800 mm, with a ratio L/D 1 of 0.25 to 1.0, with D 1 being the diameter of the inlet flow opening ( 7 ) and L being the height of the outer diffuser ( 6 ).

7. The housing according to claim 1 , wherein the circumferential wall ( 27 ) in the connecting region for the motor flange ( 16 ) has an annular section ( 28 ), which is circular in cross section, which tapers into the air guiding section ( 29 ) with an especially square cross section, wherein its corners ( 32 ) are preferentially rounded.

8. The housing according to claim 7 , wherein, starting at the annular section ( 28 ), the air guiding section ( 29 ), has an outlet surface (A 2i ) that changes toward the opposite end, wherein the outer diffuser ( 6 ) has a height (L), the inlet flow opening ( 7 ) has a diameter (D 1 ), and the inner diffuser has an internal diameter (d 1 ) in a region near the inlet flow opening ( 7 ),
wherein the optimal change in surface (ΔA i ) with respect to its inlet surface (A 1i ) is calculated with an expansion factor (k) with

k
=

[

(

D
1

+

2
×
L
×
tan
⁢

⁢
α

)

2

-

(

D
1
2

-

d
1
2

)

×

(

L

D
1

-

Assignees

• Ebm Papst Mulfingen Gmbh & Co Kg

Inventors

• Haaf Oliver
• Maschke Matthias
• Best Dieter
• Sauer Thomas
• Bundschuh Sebastian
• Beck Sven
• Engert Markus
• Schöne Jürgen
• Lust Alexander
• Hoss Sebastian

Classifications

• F04D29/663 Primary

  Sound attenuation · CPC title

• F24F7/007

  with forced flow (using ducting systems F24F7/06) · CPC title

• F04D29/646

  Mounting or removal of fans · CPC title

• F04D19/002 Primary

  Axial flow fans · CPC title

• F24F13/20

  Casings or covers · CPC title