# US 12,006,947 B2 · Diagonal fan with outlet guide vane device

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- Number: US 12,006,947 B2
- Document ID: US12006947B2
- Status: Granted
- Kind: B2
- Application number: 17/275,574
- Filed: 2019-10-09
- Published: 2022-04-07
- Granted: 2024-06-11
- Earliest claimed: 2018-11-16
- Assignees: ebm-papst Mulfingen GmbH & Co. KG
- Applicants: ebm-papst Mulfingen GmbH & Co. KG
- Inventors: Thomas Heli; Joerg Guenther; Peter Riegler; Daniel Gebert
- Web page: https://patentgrep.com/patent/US12006947B2

## CPC

- F04D 17/06: Helico-centrifugal pumps
- F04D 29/384: {characterised by form}
- F04D 25/06: the pump being electrically driven (F04D25/08 takes precedence)
- F04D 29/325: {for axial flow fans (blade mountings F04D29/34, blades F04D29/38)}
- F04D 29/44: Fluid-guiding means, e.g. diffusers
- F04D 29/441: {especially adapted for elastic fluid pumps}
- F04D 29/541: {Specially adapted for elastic fluid pumps (F04D29/56 takes precedence)}
- F04D 29/703: {specially for fans, e.g. fan guards}
- F04D 25/08: the working fluid being air, e.g. for ventilation
- F05D 2250/52: Outlet
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

A diagonal fan has an electric motor, housing, and diagonal impeller, which is accommodated within the housing, can be driven via the electric motor, and generates a diagonal flow during operation that is deflected in an axial flow direction by an inner wall of the housing. Outlet guide vane device with a plurality of guide vanes distributed in the circumferential direction is arranged adjacently to the diagonal impeller when viewed in the axial flow direction, and homogenizes airflow generated by the diagonal impeller. Guide vanes have a radial extension from a hub region of the outlet guide vane device to the housing. An imaginary extension in the outflow angle of the diagonal impeller strikes the inner wall of the housing at an axial distance K from the diagonal impeller. Outlet guide vane device is arranged at axial distance H to diagonal impeller where 0.75≤K/H≤1.25.

## Claims

### Claim 1

A diagonal fan comprising an electric motor, a housing, and a diagonal impeller having impeller blades, which is accommodated within the housing and driven via the electric motor, the diagonal flow thereof generated during operation being deflected in an axial flow direction by an inner wall of the housing,
wherein an outlet guide vane device with a plurality of guide vanes, which are distributed in the circumferential direction, is arranged adjacently to the diagonal impeller in the axial flow direction, the outlet guide vane device homogenizing an airflow generated by the diagonal impeller,
wherein the guide vanes have a radial extension from a hub region of the outlet guide vane device to the housing,
wherein the diagonal impeller has a slinger ring that encloses the impeller blades distributed in the circumferential direction and has a flow cross-section that expands outward radially in the axial flow direction and is directed to the inner wall of the housing to establish an outflow angle of the diagonal impeller such that the airflow from the diagonal impeller strikes the inner wall of the housing at a point P at an axial distance K measured from an axial plane at which the slinger ring ends and which is located at a radial outer edge of one of the diagonal impeller blades along an axial plane of the diagonal fan such that the diagonal impeller blades are enclosed within the slinger ring, and the outlet guide vane device is arranged at an axial distance H measured from the axial plane at which the slinger ring ends such that 0.75≤K/H≤1.25 so that the airflow is deflected into an axial flow direction at the inner wall of the housing and conveyed to the outlet guide vane device,
wherein the outlet guide vane device has a protective grille extending over a blow-out portion of the diagonal fan,
wherein the outlet guide vane device and the protective grille are integral and formed as a single part with the housing,
wherein the guide vanes of the outlet guide vane device, and the impeller blades, are both curved in an axial cross-section thereof in a shape of an arc but in opposite circumferential directions with respect to each other,
wherein the protective grille has a plurality of annular webs arranged coaxially as relates to each other, each of the plurality of annular webs forming web surfaces that extend parallel to the axial flow direction and are opposite one another, and the plurality of annular webs extending from corresponding positions along a radial length of each of the guide vanes, and
wherein each of the plurality of annular webs is formed to protrude axially along a leading edge of the respective guide vanes.

### Claim 2 (depends on 1)

The diagonal fan according to claim 1, characterized in that the protective grille has an axial length L, which is less than an axial length C of the outlet guide vane device, where L<0.5×C.

### Claim 3 (depends on 1)

The diagonal fan according to claim 1, characterized in that the guide vanes of the outlet guide vane device are curved in the shape of an arc and/or are profiled in the axial cross-section.

### Claim 4 (depends on 1)

The diagonal fan according to claim 1, characterized in that the guide vanes of the outlet guide vane device are formed to curve three-dimensionally.

### Claim 5 (depends on 1)

The diagonal fan according to claim 1, characterized in that the guide vanes of the outlet guide vane device directly merge into the protective grille.

### Claim 6 (depends on 1)

The diagonal fan according to claim 1, characterized in that a maximum diameter G of the hub region of the outlet guide vane device is greater than a maximum diameter F of a hub of the diagonal impeller such that the hub region of the outlet guide vane device covers the hub of the diagonal impeller, as viewed in an axial projection.

### Claim 7 (depends on 1)

The diagonal fan according to claim 1, characterized in that the outlet guide vane device has a motor mount for the electric motor in the hub region.

### Claim 8 (depends on 1)

The diagonal fan according to claim 1, characterized in that the electric motor is formed as an external rotor motor.

### Claim 9 (depends on 1)

The diagonal fan according to claim 1, characterized in that it comprises an inlet nozzle, which is arranged on the housing on the intake side, and wherein the inlet nozzle extends into the slinger ring in the axial direction.

### Claim 10 (depends on 1)

The diagonal fan according to claim 1, characterized in that the guide vanes extend through the protective grille in the axial direction and penetrate the annular webs as arc-shaped radial webs.

### Claim 11 (depends on 9)

The diagonal fan according to claim 9, characterized in that the inlet nozzle extends into the region of the diagonal impeller with an end section of smallest flow diameter, the slinger ring and an end section of the inlet nozzle overlapping one another.