# US 2021/0277910 A1 · Compact diagonal fan with outlet guide vane device

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- Number: US 2021/0277910 A1
- Document ID: US20210277910A1
- Status: Published application
- Kind: A1
- Application number: 17/258,280
- Filed: 2019-10-09
- Published: 2021-09-09
- Earliest claimed: 2018-11-16
- Assignees: ebm-papst Mulfingen GmbH & Co. KG
- Applicants: ebm-papst Mulfingen GmbH & Co. KG
- Inventors: Thomas HELI; Daniel GEBERT
- Web page: https://patentgrep.com/patent/US20210277910A1

## CPC

- F04D 29/542: {Bladed diffusers (fixing blades to stators F01D9/042)}
- F04D 17/06: Helico-centrifugal pumps
- F04D 25/0613: {the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator}
- F04D 29/703: {specially for fans, e.g. fan guards}
- F04D 29/326: {comprising a rotating shroud}
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)

## Abstract

A diagonal fan has an electric motor, a housing, and a diagonal impeller received in the housing. The diagonal fan is driven via the electric motor. The fan generates a diagonal flow during operation that is deflected in an axial flow direction by an inner wall of the housing. An outlet guide vane device is arranged adjacent to the diagonal impeller when viewed in the axial flow direction. The outlet guide vane device has a plurality of guide vanes that are distributed in a circumferential direction. The outlet guide vane device homogenizes an airflow generated by the diagonal impeller. The device has an air outlet with a specified outlet diameter B. The diagonal fan extends over a total axial length E. The ratio of the total axial length E to the outlet diameter B is configured such that 0.3≤E/B≤0.6.

## Claims

### Claim at position 1

-15. (canceled)

### Claim 16

A diagonal fan comprising:
an electric motor, a housing, and a diagonal impeller received in the housing, the diagonal impeller can be driven via the electric motor, a diagonal flow is generated during operation that is deflected in an axial flow direction by an inner wall of the housing;
an outlet guide vane device is arranged adjacent to the diagonal impeller in the axial flow direction, the outlet guide vane device has a plurality of guide vanes, that are distributed in the circumferential direction;
the outlet guide vane device homogenizes an airflow generated by the diagonal impeller and has an air outlet with a specified outlet diameter B, wherein the diagonal fan extends over a total axial length E, and the ratio of the total axial length E to the outlet diameter B is configured such that 0.3<E/B<0.6.

### Claim 17 (depends on 16)

The diagonal fan according to claim 16, wherein the diagonal fan has an air inlet with a specified intake diameter A, or a ratio of the intake diameter A to the outlet diameter B is configured such that 0.70≤A/B≤0.95.

### Claim 18 (depends on 17)

The diagonal fan according to claim 17 further comprising an inlet nozzle, the inlet nozzle is arranged on the intake side of the housing, and the inlet nozzle determines the intake diameter A.

### Claim 19 (depends on 16)

The diagonal fan according to claim 16, wherein the outlet guide vane device has an axial extension C and the diagonal impeller has an axial impeller width D, and the ratio of the axial extension C to impeller width D is configured such that 0.30≤C/D≤0.75, in particular 0.4≤C/D≤0.5.

### Claim 20 (depends on 16)

The diagonal fan according to claim 16, wherein the outlet guide vane device has a protective grating extending over an outlet portion of the diagonal fan, which has an axial length that is less than a total axial length C of the outlet guide vane device.

### Claim 21 (depends on 20)

The diagonal fan according to claim 20, wherein the outlet guide vane device, the housing and the protective grating are formed integrally.

### Claim 22 (depends on 20)

The diagonal fan according to claim 20, wherein the protective grating has a plurality of annular webs arranged coaxially to each other, each web forms web surfaces extending parallel to the axial flow direction and opposite to each other.

### Claim 23 (depends on 22)

The diagonal fan according to claim 22, wherein the annular webs in the region of the guide vanes are formed such that they protrude axially from an inflow edge of the respective guide vanes.

### Claim 24 (depends on 16)

The diagonal fan according to claim 16, wherein the guide vanes of the outlet guide vane device, in the axial cross-section, are arcuately curved and/or formed in a profile shape.

### Claim 25 (depends on 16)

The diagonal fan according to claim 16, wherein the guide vanes of the outlet guide vane device are three-dimensionally curved.

### Claim 26 (depends on 20)

The diagonal fan according to claim 20, wherein the guide vanes of the outlet guide vane device merge directly into the protective grating.

### Claim 27 (depends on 16)

The diagonal fan according to claim 16, wherein a maximum diameter G of a 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 seen in an axial projection.

### Claim 28 (depends on 16)

The diagonal fan according to claim 16, wherein the outlet guide vane device has a motor mount for the electric motor in its hub region.

### Claim 29 (depends on 16)

The diagonal fan according to claim 16, wherein the diagonal impeller has a slinger ring, that surrounds the impeller vanes distributed in the circumferential direction and the slinger ring determines the outflow angle of the diagonal impeller.

### Claim 30 (depends on 29)

The diagonal fan according to claim 29, wherein the inlet nozzle is arranged on the intake side of the housing and extends into the slinger ring in the axial direction.