Axial fan

Patent metadata

Field	Value
Publication number	US-10781818-B2
Application number	US-201314383542-A
Country	US
Kind code	B2
Filing date	Mar 6, 2013
Priority date	Mar 6, 2012
Publication date	Sep 22, 2020
Grant date	Sep 22, 2020

Abstract

An axial fan has a housing and a motor with motor shaft and blower wheel attached to the motor shaft. The blower wheel has fan blades attached to a hub and provided with a leading and a trailing edge, respectively. A suspension arrangement is provided with a brace part made from flat material. The brace part connects motor and housing and has a length measured in a direction from motor to housing. The brace part is arranged on edge in an airflow direction and has a width measured in the airflow direction. The brace part has two limbs extending lengthwise in length direction of the brace part. The limbs are spaced apart from each other and delimit opposite sides of an opening formed by a punch-out in the flat material and extending along some of the length. The limbs are arranged one behind the other in airflow direction.

First claim

The invention claimed is:

1. A method for manufacturing an axial fan, the axial fan comprising:
a cylindrical housing;
a motor arranged in and surrounded by the cylindrical housing, wherein the motor comprises a motor shaft;
a blower wheel attached to the motor shaft;
the blower wheel comprising a hub and fan blades attached to the hub;
the fan blades comprising a leading edge and a trailing edge, respectively;
a suspension arrangement comprising at least one brace part that is a flat sheet metal part;
the at least one brace part comprising a first end, positioned radially outwardly and directly connected to a cylindrical inner wall of the cylindrical housing, and further comprising a second end, opposite the first end and directly connected to an outside of a motor housing of the motor, so that the motor is connected to the cylindrical housing by the at least one brace part, wherein the at least one brace part has a length and said length is measured from the motor housing of the motor to the cylindrical housing;
the at least one brace part arranged axially at a level of the motor housing and arranged in a direction of airflow through the cylindrical housing so as to be positioned edgeways and having a width measured in the direction of airflow;
the at least one brace part comprising two limbs extending lengthwise in a direction of said length of the at least one brace part from the first end to the second end, wherein the two limbs are spaced apart from each other and delimit opposite sides of at least one opening formed by a punch-out in the flat sheet metal part and extending along most of said length, wherein the two limbs are arranged one behind the other in the direction of airflow, wherein the at least one opening extending along most of said length reduces noise emission and flow resistance of the axial fan;
wherein the method comprises:
producing by casting in a mould identical castings as blade blanks;
cutting the blade blanks by a cylindrical cut to a desired external diameter of the blower wheel;
imparting by cutting a final contour of a fan blade to the blade blanks, wherein the final contour is matched to the external diameter and a stepped angle of the fan blades.

2. A method for manufacturing an axial fan, the axial fan comprising:
a cylindrical housing;
a motor arranged in and surrounded by the cylindrical housing, wherein the motor comprises a motor shaft;
a blower wheel attached to the motor shaft;
the blower wheel comprising a hub and fan blades attached to the hub;
the fan blades comprising a leading edge and a trailing edge, respectively;
a suspension arrangement comprising at least one brace part that is a flat sheet metal part;
the at least one brace part comprising a first end, positioned radially outwardly and directly connected to a cylindrical inner wall of the cylindrical housing, and further comprising a second end, opposite the first end and directly connected to an outside of a motor housing of the motor, so that the motor is connected to the cylindrical housing by the at least one brace part, wherein the at least one brace part has a length and said length is measured from the motor housing of the motor to the cylindrical housing;
the at least one brace part arranged axially at a level of the motor housing and arranged in a direction of airflow through the cylindrical housing so as to be positioned edgeways and having a width measured in the direction of airflow;
the at least one brace part comprising two limbs extending lengthwise in a direction of said length of the at least one brace part from the first end to the second end, wherein the two limbs are spaced apart from each other and delimit opposite sides of at least one opening formed by a punch-out in the flat sheet metal part and extending along most of said length, wherein the two limbs are arranged one behind the other in the direction of airflow, wherein the at least one opening extending along most of said length reduces noise emission and flow resistance of the axial fan;
wherein the method comprises:
producing by casting in a mould a blade blank that comprises a material accumulation as a winglet blank in an area of a wing tip of a fan blade to be produced from the blade blank, wherein the material accumulation is thicker than a remaining blade blank body of the blade blank;
machining or processing the winglet from the winglet blank and matching the winglet to an external diameter and a stepped angle of the fan blade.

Assignees

• Ziehl Abegg Se

Inventors

• Sadi Omar
• Gross Andreas
• Ernemann Lothar
• Lörcher Frieder

Classifications

• F04D29/384 Primary

  characterised by form · CPC title

• F04D29/667

  by influencing the flow pattern, e.g. suppression of turbulence · CPC title

• F04D29/542

  Bladed diffusers (fixing blades to stators F01D9/042) · CPC title

• F05D2230/51

  in a modular way, e.g. using several identical or complementary parts or features · CPC title

• F04D29/666

  by means of rotor construction or layout, e.g. unequal distribution of blades or vanes · CPC title