RETAINING DEVICE FOR AN ANEMOMETER, AND CENTRIFUGAL FAN

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.

Claims

1. 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 formed by radial struts and circumferential struts, and wherein the retaining device has retaining means, by means of which the anemometer can be fastened to the retaining device, 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. (canceled)

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

5. The retaining device according to claim 3, wherein the radial struts extend curved in the shape of an arc in the circumferential direction.

6. The retaining device according to claim 3, wherein a number n of the circumferential struts is determined by n=D.sub.a/X, wherein X is in a value range of 20≤X≤80, D.sub.a corresponds to the value in millimeters of a flow diameter (D.sub.S) of the retaining device, and wherein n is rounded to an integer.

7. 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 the radial extension of the retaining device.

8. The retaining device according to claim 1, wherein the 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.

9. 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.

10. The retaining device according to claim 7, 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.

11. The retaining device according to t claim 10, 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.

12. The retaining device according to claim 9, wherein a ring segment cross-sectional area (A.sub.m) of an inner ring segment increases toward a ring segment cross-sectional area (A.sub.m-1) of a respective ring segment adjoining the inner ring segment radially outward, wherein A.sub.m=Y.Math.A.sub.m-1, with 1.1≤Y≤2.5.

13. A unit of a retaining device according to claim 1 with an attached impeller anemometer for use in the fan.

14. 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.

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

16. The centrifugal fan according to claim 14, 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.

17. The retaining device according to claim 3, wherein a number n of the circumferential struts is determined by n=D.sub.a/X, wherein X is in a value range of 35≤X≤60, D.sub.a corresponds to the value in millimeters of a flow diameter (D.sub.S) of the retaining device, and wherein n is rounded to an integer.

18. The retaining device according to claim 9, wherein a ring segment cross-sectional area (A.sub.m) of an inner ring segment increases toward a ring segment cross-sectional area (A.sub.m-1) of a respective ring segment adjoining the inner ring segment radially outward, wherein A.sub.m=Y.Math.A.sub.m-1, with 1.2≤Y≤2.0.

19. 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 retainer configured for fastening the anemometer to the retaining device in a position axially adjoining the flow channels.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Other advantageous further developed embodiments of the disclosure are characterized in the dependent claims and/or are described in more detail through the drawings in conjunction with the description of the preferred embodiment of the disclosure. The drawings show:

[0027] FIG. 1 A perspective view of a retaining device with an anemometer connected to the rear;

[0028] FIG. 2 An axial front view of the retaining device from FIG. 1;

[0029] FIG. 3 A perspective rear view of the outlet side of the retaining device from FIG. 1 combined with a downstream anemometer as a unit;

[0030] FIG. 4 A partial sectional view of the retaining device and the anemometer from FIG. 3;

[0031] FIG. 5 A sectional side view of the retaining device from FIG. 1;

[0032] FIG. 6 An alternative embodiment of the retaining device from FIG. 1 connected to a centrifugal fan; and

[0033] Identical reference numbers refer to identical components in all views.

DETAILED DESCRIPTION

[0034] FIGS. 1 to 5 show a first embodiment of a retaining device 1 designed as a flow conditioner, which retaining device 1 is partially shown together with an attached impeller anemometer 30 as a unit 90; see FIGS. 1 to 4. The retaining device 1, or the unit 90 of the retaining device 1 and the impeller anemometer 30, is arranged on an outlet area 60 of a centrifugal fan 100, an example of which is shown in FIG. 6. Alternatively, the retaining device 1, or the unit 90 of the retaining device 1 and the impeller anemometer 30, is inserted into the outlet area 60 and fixed to the inner wall of the fan housing 50.

[0035] In FIGS. 1 and 2, the retaining device 1 is shown in a round embodiment, as seen from its intake side. Between the circumferential support ring 7 and the axially central mount 9 comprising the center axis M, the arrangement of bars is formed by four circumferential struts 4 forming closed rings and seven continuous radial struts 3, as well as a plurality of radial struts 3 extending across partial radial sections, by means of which arrangement of bars the retaining device 1 forms flow channels 2 adjoining each other in the radial and circumferential direction in the manner of a honeycomb. The circumferential struts 4 divide the retaining device 1 into multiple radially adjoining ring segments 55, 56, 57, 58, 59, the respective ring segment cross-sectional area of which increases in the radially outward direction. At the same time, the number of radial struts 3 increases from ring segment to ring segment in the radially outward direction by an integral multiple, i.e., there are seven radial struts 3 in the first ring segment, fourteen radial struts 3 in the second ring segment, twenty-one radial struts 3 in the third ring segment 57, up to the fifth ring segment 59, in which forty-two radial struts 3 are arranged. The increase in the number of radial struts 3 reduces the flow surface of the flow channels 2, such that the respective flow surface of the flow channels 2 decreases from ring segment to ring segment in the radially outward direction. In the embodiment shown here, the radially non-continuous radial struts 3 always extend exclusively between two adjacent circumferential struts 4. All radial struts 3 are curved in the shape of an arc, counterclockwise as seen from the outlet side according to FIG. 1.

[0036] Multiple protrusions 8 are formed at the outer circumferential edge of the support ring 7, by means of which protrusions 8 the support ring 7 and thus the retaining device 1 can be attached to the inner wall of the fan housing 50, including, for example, the housing shown in FIG. 6.

[0037] Referring to FIG. 5, the retaining device 1 is shown in a sectional side view to show that, according to this embodiment, the mean axial longitudinal extension t of the retaining device t in the area of the flow channels 2 is constant over the radial extension of the retaining device 1. Both the radial struts 3 and the circumferential struts 4 respectively extend bar-like across the entire axial longitudinal extension t. In addition, the flow diameter DS of the retaining device 1 is marked. Referring to FIG. 2, it is clear that the mean axial longitudinal extension t of the retaining device 1 is greater in the area of the flow channels 2 than the mean circumferential length L of the flow channels 2 in the radially outermost ring segment 59, such that t>L.

[0038] As the impeller anemometer 30 is always fixed at the retaining device 1 according to FIGS. 1-4, the retaining device 1 and the impeller anemometer 30 can be considered as a unit 90, which can be used, for example, in the centrifugal fan according to FIG. 6. The impeller anemometer 30 has multiple impeller blades 31 spaced apart in the circumferential direction, which blades are curved in the circumferential direction, wherein the curvature direction of the radial struts 3 is opposite, as can be clearly seen in FIGS. 2 and 3, for example. Furthermore, the impeller anemometer 30 comprises a circumferential ring 16, which essentially corresponds to the support ring 7 with respect to its outer radius, and which is attached to the same or is attached to the same on the radially inward or outward side. The impeller blades 31 meet in the center at a hub 19 and are arranged such that they are supported on the mount 9 of the retaining device 1 by means of an axle 18, such that the impeller blades 31 can rotate relative to the retaining device 1 and to the circumferential ring 16.

[0039] FIG. 6 shows a centrifugal fan 100 with a spiral-shaped fan housing 50, which comprises the outlet area 60. An alternative, square version of the retaining device 1′ with an attached impeller anemometer 30, which again can be mounted together as a unit 90, is fixed on the outside of the outlet area 60. All the characteristics discussed above also apply to the embodiment of the retaining device 1′, which only protrudes beyond the circumferential ring 16 of the impeller anemometer 30 and which defines four fastening points 66 on the outer edge sections defining its square shape, by means of which fastening points 66 the centrifugal fan 100 is mounted at its place of operation. Multiple parallel struts 67 extend in a straight line radially outward in the outer edge sections.