DE10310868A1 - Radial fan, in particular made of plastic - Google Patents

Abstract

The invention relates to a radial fan (1), in particular made of plastic, with a plurality of blades (3) arranged between two rings (2), wherein the blades (3) are formed as hollow profiles, and between the two walls of the blades (3). Webs (5) are provided.

Description

The invention relates to a radial fan, in particular of plastic and in particular for a motor vehicle, according to the preamble of claim 1.

Conventional radial fan wheels are usually made of a sheet metal or made of plastic. Due to occurring relatively large centrifugal forces high speeds occur Deformations of the blades, making it in the area of tethers between the individual blades and the two rings too high Tensions come. This is particularly problematic in plastic radial fan wheels.

It is the object of the invention improved radial fan, in particular made of plastic, to provide.

This task is solved by a radial fan with the features of claim 1. Advantageous embodiments are the subject of the dependent claims.

According to the invention, a radial fan, especially for a motor vehicle, arranged with a plurality of between two rings Shovels provided, which are formed as hollow profiles, wherein between the two walls the blades webs are provided.

Due to the double-walled design the blades, wherein connecting webs are provided, are the Stiffness of the blades increased and reduces tensions in the area of connection points, so that too higher Speeds and thus higher Volume flows, as for example for cooling of motor vehicles are required, with plastic centrifugal fans without the occurrence of material problems can be achieved. The stiffness can through reinforcements, For example, by glass fibers, be further increased in the plastic. As a result of the cavities Weight and material can be saved. It can also be cheaper for the same applications Plastics are used, so the manufacturing costs to decrease. As a result of lower deformations at high speeds less imbalances occur, making the operation safer and the Probability of default is lower.

Preferably, the webs are vertical arranged to the wall of the blades, allowing optimal stiffening he follows.

The distance between two webs is preferably one up to three times, preferably about twice, the distance between the opposite Walls of the Blades. This results in optimum rigidity with minimal impact Mass.

Preferably, the thickness of the webs about the same or slightly larger than the thickness of the walls the blades. It is preferred at the transition from a wall to a Bridge provided a radius, which is preferably slightly smaller than the Thickness of the bridge is. The radius reduces the risk of cracking as a result of a more even Stress distribution in the critical areas.

In the following the invention is based on an embodiment explained in detail with reference to the drawing. In show the drawing:

1 a perspective view of a radial fan according to the invention made of plastic,

2 a detailed view of the radial fan of 1 and

3 a section through a blade of the radial fan of 1 ,

An inventive plastic radial fan 1 for the engine cooling of a motor vehicle has six between two parallel rings 2 arranged blades 3 on, which via connection points 4 connected to each other. The outer shape of the blades 3 corresponds to that of conventional blades, ie the blades 3 point in the plane parallel to the rings 2 a slightly curved profile and in the axial direction, perpendicular to the rings 2 running walls on. Unlike conventional blades, the blades are 3 how best 3 can be seen as hollow sections with a plurality of continuous webs 5 educated. The bridges 5 are each substantially perpendicular to the corresponding walls of the blades 3 arranged.

The thickness DS of the webs 5 is slightly larger than the thickness DW of the wall according to the present embodiment. The transitions from the jetties 5 to the two walls of the shovel 3 are rounded with a radius R. The radius R is slightly smaller than the thickness DS of the webs according to the present embodiment 5 and corresponds to the thickness of the wall DW. The distance AS between two adjacent webs 5 is about twice the distance AW of the two walls of the blade 3 ,

1

radial fan

2

ring

3

shovel

4

connecting point

5

web

AS

distance between two adjacent bridges

AW

distance the two walls the shovel

DS

thickness web

DW

thickness wall

R

radius

Claims (7)

Radial fan, in particular of plastic, with a plurality of between two rings ( 2 ) arranged blades ( 3 ), characterized in that the blades ( 3 ) as hollow profiles ausgebil det, being between the two walls of the blades ( 3 ) Webs ( 5 ) are provided. Radial fan according to claim 1, characterized in that the webs ( 5 ) perpendicular to the wall of the blades ( 3 ) are arranged. Radial fan according to claim 1 or 2, characterized in that the distance (AS) of two webs ( 5 ) one to three times the distance (AW) of the opposite walls of the blades ( 3 ). Radial fan according to claim 3, characterized in that the distance (AS) of two webs ( 5 ) 1.8 to 2.2 times the distance (AW) of the opposite walls of the blades ( 3 ). Radial fan according to one of the preceding claims, characterized in that the thickness (DS) of the webs ( 5 ) equal to or slightly larger than the thickness (DW) of the walls of the blades ( 3 ). Radial fan according to one of the preceding claims, characterized in that a radius (R) at the transition from a wall to a web ( 5 ) is provided. Radial fan according to claim 6, characterized in that the radius (R) is smaller than the thickness (DS) of the web ( 3 ).