Radial fan wheel

• US 6,039,539 A
• Filed: 06/08/1998
• Issued: 03/21/2000
• Est. Priority Date: 09/07/1995
• Status: Expired due to Fees

• Current Assignee: Gunnar Berg
• Original Assignee: Gunnar Berg
• Inventors: Berg, Gunnar
• Primary Examiner(s): Look, Edward K.
• Assistant Examiner(s): NGUYEN, NINH H
• Application Number:
  US09/155,137
• Time in Patent Office: 652 Days
• Field of Search: 415/119, 416/186 R, 416/185, 416/223 B, 416/189, 416/192
• US Class Current: 416/186.00R
• CPC Class Codes: F04D 29/282 the leading edge of each vane being substantially parallel to the rotation axis
• CPC Class Codes: F04D 29/288 Part of the wheel having an ejecting effect, e.g. being bladeless diffuser

Abstract

A radial fan wheel comprising a number of fan blades symmetrically arranged with substantially equal spacing around the rotational shaft of the fan wheel. The blades are mounted between two end plates that are arranged perpendicularly to the shaft and are provided with blade surfaces which are substantially parallel to the shaft and each of which blade extends from one point at a distance from the shaft and substantially arched in the direction outwardly towards the periphery of the wheel. One first end plate is provided with a central air inlet and is shaped with a curve that, in a position radially outwardly from the innermost edges of the blades, substantially arches towards the second end plate and further radially outwardly towards the peripheral edges of the blades. Each blade is so designed in the peripheral segment that the blade extends radially longer outwardly adjacent the first end plate than the second end plate.

Claims

1. A radial fan wheel for transporting air in ventilation equipment comprising:

a) a number of fan blades (10) symmetrically arranged with substantially equal spacing around the rotational shaft (11) of the fan wheel,

b) the fan blades being mounted between two end plates (12,

     13) that are arranged perpendicularly to said shaft and are provided with blade surfaces which are substantially parallel to said shaft and each of which blade surfaces extends from one point at a distance from said shaft and substantially arched in the direction outwardly toward the periphery of the wheel,

c) one first end plate (12) is provided with a central air inlet (14), and is shaped with a curve that, in a position radially outwardly from the innermost edges of the blades, substantially arches towards the second end plate (13) and further radially outwardly towards the peripheral edge (18) of the blades,

d) the peripheral part of the first end plate (12) is curved away from the second end plate (13),

e) each blade (10) is designed having a peripheral segment which extends radially longer outwardly adjacent the first end plate (12) than at the second end plate (13) and

f) the peripheral edge (18) of each blade has a bevel cut edge so that this latter edge meets the first end plate (12) at a point (19) situated at a distance from the rotation shaft (11) which distance is greater than the distance between said shaft and the point (20) where the peripheral edge (18) of the blade meets the second plate (13).

2. A radial fan wheel according to claim 1, characterized in that the peripheral edge (17) of the second end plate (13) is curved away from the end plate (12) being provided with the air inlet (14).

3. A radial fan wheel according to claim 1 or 2, characterized in that the peripheral edge (18) of each blade (10) extends substantially straight between the two points (19, 20).