Fan

Patent metadata

Field	Value
Publication number	US-12523239-B2
Application number	US-202318517902-A
Country	US
Kind code	B2
Filing date	Nov 22, 2023
Priority date	Nov 25, 2022
Publication date	Jan 13, 2026
Grant date	Jan 13, 2026

Abstract

A fan with a housing which defines an axial flow channel having a cross-section, wherein the flow channel has a first axial portion on the suction side and a second axial portion adjoining in the flow direction. The flow channel has a first cross-section in the first axial portion a transitioning cross-section through the second axial portion. The cross-section is arranged concentrically in an imaginary rectangular base area, the side edges of which coincide at least in sections with a contour of the first cross-section, and wherein the flow channel has in its second axial portion an intermediate cross-section which widens in the flow direction within the base area and which, starting from the first cross-section, increases to a second cross-section at the pressure-side end of the second axial portion.

First claim

The invention claimed is:

1 . A fan having a fan housing which defines an axial flow channel having a varying cross-section and leading from a suction side (A) to a pressure side (B) and in which a flow directed from the suction side (A) to the pressure side (B) can be generated in a flow direction (C),
wherein the flow channel has a first axial portion on the suction side and a second axial portion adjoining the first axial portion in the flow direction (C), wherein the flow channel has a first cross-section in the first axial portion at least at a transition from the first axial portion to the second axial portion, wherein the varying cross-section is arranged concentrically in an axial projection of an imaginary rectangular base area, and the side edges of the axial projection of the imaginary rectangular base coincide at least in portions with an outer periphery of the first cross-section, and wherein the flow channel in its second axial portion has a plurality of intermediate cross-sections which widen in the flow direction (C) within the axial projection of the imaginary rectangular base area and which, starting from the first cross-section, increases to a second cross-section at the pressure-side end of the second axial portion, so that an outer periphery of the varying cross-section widens in the flow direction (C) and increasingly approaches the projection of the imaginary rectangular base area from the first cross-section to the second cross-section such that an outer periphery of the varying cross-section increasingly takes a rectangular shape of the axial projection of the imaginary rectangular base area.

2 . The fan according to claim 1 ,
wherein the plurality of intermediate cross-sections of the flow channel widens continuously and/or constantly over the entire second axial portion.

3 . The fan according to claim 1 ,
wherein the fan housing has an overall length (L) in the axial direction which is greater than a width of the fan housing which is orthogonal thereto, and the second axial portion has a length in the axial direction of at least one third of the total length (L).

4 . The fan according to claim 1 ,
wherein the first cross-section has a round outer periphery and has a diameter which corresponds to an edge length of the rectangular base area, so that the outer periphery of the first cross-section has four contact points (P), which are offset by 90° relative to each other, with the side edges of the imaginary rectangular base area.

5 . The fan according to claim 4 ,
wherein the contact points of the first cross-section transition from contact points to contact lines from the first cross-section towards the second cross-section, the contact lines becoming increasingly longer towards the second cross-section.

6 . The fan according to claim 1 ,
further having an impeller arranged in the flow channel for generating the flow, wherein the impeller is arranged at least in sections in the first axial portion and the second axial portion and extends over an entire axial length of the second axial portion.

7 . The fan according to claim 6 ,
wherein the impeller has a cover disk which begins in the region of the first axial portion and ends at the transition of the first axial portion to the second axial portion.

8 . The fan according to claim 1 ,
wherein the flow channel has a third axial portion adjoining the second axial portion in the flow direction (C), and wherein the flow channel has an outer periphery over the entire third axial portion that corresponds to an outer periphery of the flow channel in the second cross section.

9 . The fan according to claim 8 ,
wherein the fan housing is formed in two parts and the first axial portion and the second axial portion are provided in a first partial housing and the third axial portion is provided in a second partial housing.

10 . The fan according to claim 8 , further having a guide wheel arranged in the third axial portion.

11 . The fan according to claim 10 ,
wherein the guide wheel has a hub which is arranged concentric to the base area and/or the flow channel and which is formed by a conical wall tapering in the flow direction (C).

12 . The fan according to claim 11 ,
wherein the guide wheel is formed integrally with the fan housing and has guide vanes extending from a wall of the fan housing defining the flow channel to the hub.

13 . The fan according to claim 6 ,
wherein the guide wheel forms a motor holder for holding a motor driving the impeller within the fan housing.

14 . The fan according to claim 1 ,
wherein on the suction side of the first axial portion, a suction opening is provided from which in particular an inflow nozzle extends into the flow channel.

15 . The fan according to claim 14 ,
wherein the inflow nozzle adjoins the end face of the first axial portion.

16 . The fan according to claim 1 ,
wherein the outer periphery of the flow channel increases in size continuously in the flow direction (C) at least in the first axial portion and/or the second axial portion.

17 . The fan according to claim 1 ,
wherein the plurality of intermediate cross-sections of the flow channel widen linearly over the entire second axial portion.

18 . The fan according to claim 1 ,
wherein the fan housing has an overall length (L) in the axial direction which is greater than a width of the fan housing which is orthogonal thereto, and the second axial portion has a length in the axial direction of at least half of the total length (L).

19 . The fan according to claim 1 ,
wherein the fan housing has an overall length (L) in the axial direction which is greater than a width of the fan housing which is orthogonal thereto, and the second axial portion has a length in the axial direction of at least two thirds of the total length (L).

20 . The fan according to claim 1 , wherein the outer periphery of the varying cross-section changes shape from a round shape to rectangular shape from the first cross-section to the second cross-section.

Assignees

• Ebm Papst Mulfingen Gmbh & Co Kg

Inventors

• Blaha Niels
• Gebert Daniel

Classifications

• F04D25/08

  the working fluid being air, e.g. for ventilation · CPC title

• F04D25/06

  the pump being electrically driven (F04D25/08 takes precedence) · CPC title

• F04D19/002

  Axial flow fans · CPC title

• F05D2210/12

  gaseous, i.e. compressible · CPC title

• F05D2240/20

  Rotors · CPC title