Retaining device for an anemometer, and centrifugal fan

Patent metadata

Field	Value
Publication number	US-12405147-B2
Application number	US-201916965060-A
Country	US
Kind code	B2
Filing date	Mar 6, 2019
Priority date	May 3, 2018
Publication date	Sep 2, 2025
Grant date	Sep 2, 2025

Abstract

The disclosure relates to a retaining device for an anemometer, designed for use on a fan housing of a fan, wherein the retaining device is designed as a flow conditioner having a plurality of axial flow channels divided into a honeycomb structure by an arrangement of bars, and wherein the retaining device has retaining means, by means of which the anemometer can be fastened to the retaining device such that the former axially adjoins the flow channels.

First claim

The invention claimed is:

1. An anemometer designed for use on a fan housing of a fan, the anemometer receiving air from an upstream direction, the anemometer comprising:
an impeller;
a retaining device for mounting the anemometer to the fan housing, wherein the retaining device is designed as a flow conditioner to straighten swirling flow of the air, the retaining device located upstream of the impeller and having a plurality of axial flow channels divided into a honeycomb structure by an arrangement of bars formed by radial struts and circumferential struts, wherein each of the radial struts extend curved in the shape of an arc in the same circumferential direction; and
wherein the retaining device has retaining means, by means of which the anemometer can be fastened to the retaining device such that it is axially adjoining the flow channels.

2. The retaining device according to claim 1 , wherein the retaining device has fastening means for fastening the retaining device in an outlet area of the fan housing of the fan.

3. The retaining device according to claim 1 , wherein a first number of radial struts extend from a center axis (M) of the retaining device across multiple circumferential struts, and a second number of radial struts exclusively extend between radially adjacent circumferential struts.

4. The retaining device according to claim 1 , wherein each of the radial struts are curved in a direction that is opposite a direction of curvature of blades of the impeller.

5. The retaining device according to claim 1 , wherein a number n of the circumferential struts is determined by n=D a /X, wherein X is in a value range of 20≤X≤80, D a corresponds to the value in millimeters of a flow diameter (Ds) of the retaining device, and wherein n is rounded to an integer.

6. The retaining device according to claim 1 , wherein an axial longitudinal extension (t) of the retaining device is constant in the area of the flow channels over a radial extension of the retaining device.

7. The retaining device according to claim 1 , wherein central flow channels adjacent to a center axis (M) of the retaining device have a greater maximum flow cross-sectional area than flow channels located further outside in the radial direction.

8. The retaining device according to claim 1 , wherein the circumferential struts form closed rings and divide the retaining device into multiple radially adjacent ring segments.

9. The retaining device according to claim 6 , wherein the circumferential struts form closed rings and divide the retaining device into multiple radially adjacent ring segments, and wherein the mean axial longitudinal extension (t) of the retaining device is greater in the area of the flow channels than a mean circumferential length (L) of the flow channels in a radially outermost ring segment.

10. The retaining device according to claim 9 , wherein a number of radial struts in radially outer ring segments is an integral multiple higher than in a radially innermost ring segment, which adjoins the central axis (M) of the retaining device.

11. The retaining device according to claim 8 , wherein a ring segment cross-sectional area (A m ) of an inner ring segment increases toward a ring segment cross-sectional area (A m−1 ) of a respective ring segment adjoining the inner ring segment radially outward, wherein A m =Y·A m−1 , with 1.1≤Y≤2.5.

12. A unit comprising a retaining device according to claim 1 , and an impeller anemometer attached to the retaining device, the unit for use in the fan.

13. A centrifugal fan with a fan housing having an outlet area, wherein the retaining device according to claim 1 is fixed to the outlet area of the fan housing and the anemometer is arranged on the retaining device directly adjoining retaining device in the axial flow direction, and the anemometer is attached to the retaining device via the retaining means.

14. The centrifugal fan according to claim 13 , wherein the retaining device designed as a flow conditioner is arranged upstream of the anemometer as seen in the axial flow direction.

15. The centrifugal fan according to claim 13 , wherein the anemometer is designed as a impeller anemometer with multiple impeller blades arranged such that they are spaced apart in the circumferential direction, wherein the impeller blades are curved in an arc shape in a circumferential direction opposite to the radial struts.

16. The retaining device according to claim 1 , wherein a number n of the circumferential struts is determined by n=D a /X, wherein X is in a value range of 35≤X≤60, D a corresponds to the value in millimeters of a flow diameter (Ds) of the retaining device, and wherein n is rounded to an integer.

17. The retaining device according to claim 8 , wherein a ring segment cross-sectional area (A m ) of an inner ring segment increases toward a ring segment cross-sectional area (A m−1 ) of a respective ring segment adjoining the inner ring segment radially outward, wherein A m =Y·A m−1 , with 1.2≤Y≤2.0.

18. An anemometer designed for use on a fan housing of a fan, the anemometer comprising an impeller having curved blades and a retaining device for mounting the anemometer to the fan housing, wherein the retaining device is designed as a flow conditioner to straighten a swirling flow of air from the fan, the retaining device having a plurality of axial flow channels divided into a honeycomb structure by an arrangement of bars including a plurality of radial struts extending radially and curved in a direction opposite a curvature of the curved blades of the impeller, and wherein the retaining device has a retainer configured for fastening the anemometer to the retaining device in a position axially adjoining the flow channels such that the flow conditioner is upstream of the impeller of the anemometer.

19. The retaining device according to claim 18 , wherein the arrangement of bars includes a plurality of circumferential struts.

Assignees

• Ebm Papst Mulfingen Gmbh & Co Kg

Inventors

• Gebert Daniel
• Heli Thomas
• Riegler Peter
• Schaaf Valerius

Classifications

• G01F1/12

  Adjusting, correcting, or compensating means therefor · CPC title

• F04D29/4226

  Fan casings · CPC title

• F04D27/001 Primary

  Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring · CPC title

• G01F15/18 Primary

  Supports or connecting means for meters · CPC title

• G01F1/10

  using rotating vanes with axial admission · CPC title