Housing for a fan and fan

Abstract

Disclosed embodiments relate to a housing for a fan that is constructed by cutting, bending, and/or folding a single sheet of metal. A disclosed housing is configured to house a fan having a motor that is configured to rotate around an axial direction. The housing includes a first plate that is oriented in a plane that is perpendicular to the axial direction and substantially flat wall regions extending away from the first plate so as to be non-coplanar with the first plate. The housing further includes a second plate having an air intake nozzle, the second plate oriented perpendicularly to the axial direction and thereby oriented parallel to the first plate and located a first distance along the axial direction from the first plate, with the first distance being determined by a length of the wall regions. The wall regions are configured to include air flow openings.

1 . A housing for a fan, in particular for a radial or diagonal fan, comprising:
 wall regions forming the housing,   wherein the wall regions are substantially planar or flat.   
     
     
         2 . The housing according to  claim 1 , wherein the wall regions are manufactured from substantially regionally planar molded parts, optionally from regionally planar or flat metal sheets. 
     
     
         3 . The housing according to  claim 1  wherein the wall regions form an approximately 90° rotational symmetry. 
     
     
         4 . The housing according to  claim 1 , wherein a molded part on a bottom disk side is arranged in parallel to a nozzle plate of the fan or a molded part on a nozzle plate side at a distance,
 wherein the distance is defined by sheet metal parts arranged to form at least side parts.   
     
     
         5 . The housing according to  claim 4 , wherein the sheet metal parts which form the side parts also form a stabilization region which extends between the nozzle plate and side parts and in which sheet metal extends essentially over an entire circumference in a substantially closed manner. 
     
     
         6 . The housing according to  claim 4 , wherein the molded part on the bottom disk side is angular or square or has chamfers or radii, the chamfers or radii having a convexly curved outer contour, the molded part not having corners. 
     
     
         7 . The housing according to  claim 4 , wherein the side parts are formed from 1, 2 or 3 planar subregions which supplement each other in a straight line or at an angle to one another to form respective side parts. 
     
     
         8 . The housing according to  claim 4 , wherein the side parts, viewed in an axial direction, extend over a through-flow region and, viewed in a circumferential direction, only partially extend over the respective side of the housing and, with their thus reduced area, block a part of the actual through-flow area and define air outlets with openings thus formed between adjacent side parts in the circumferential direction. 
     
     
         9 . The housing according to  claim 1 , wherein the flat wall regions are at least largely integrally manufactured, for by trimming and folding or bending, from a sheet metal plate. 
     
     
         10 . The housing according to  claim 8 , wherein the side parts each have an inflow-side edge and an outflow-side edge,
 wherein the air outlets each extend between the outflow-side edge of one side part and the inflow-side edge of an adjacent side part in a rotational direction of an associated fan impeller.   
     
     
         11 . The housing according to  claim 10 , wherein the inflow-side and/or outflow-side edges extend obliquely to a fan axis, and have an angle of 5°-45° in relation thereto. 
     
     
         12 . The housing according to  claim 10 , wherein the inflow-side and/or outflow-side edges are provided with waves, serrations, or other flow-influencing measures in a sense of trimming the essentially planar wall regions. 
     
     
         13 . The housing according to  claim 4 , wherein the side parts are provided with elevations or depressions, including one or more of beads, grooves, dimples, and waves, by deformation, and optionally by embossing. 
     
     
         14 . The housing according to  claim 1 , wherein a side length of an essentially square footprint of an enveloping cuboid of the housing is approximately 1.4 to 1.8 times a mean diameter of a blade trailing edge of an impeller of the fan. 
     
     
         15 . The housing according to  claim 1 , wherein the housing is configured to be installed within an air duct having multiple air outlets, the air duct optionally having three or four air outlets. 
     
     
         16 . The housing according to  claim 15 , wherein the housing is configured to be installed at a bottom of the air duct, optionally via damper elements. 
     
     
         17 . The housing according to  claim 1 , wherein, in a comparison of a suction-side narrow band sound spectra of a fan having a housing and an otherwise identical fan, in which the housing has been replaced by a motor suspension that largely does not affect flow conditions, at a delivery volume flow that is in a range of rather higher pressure increases on a fan characteristic curve for constant speed, in the sound spectrum corresponding to the fan having housing, the maximum subharmonic sound pressure increase is at least 3 dB lower in a frequency range between 70% and 90% of the blade repetition frequency. 
     
     
         18 . The housing according to  claim 1 , wherein the housing is compact when viewed in a radial direction and in cross section does not exceed a square dimension having a side length of 1.3 times an impeller diameter. 
     
     
         19 . The housing according to  claim 1 , further comprising a fan installed in the housing.