EP1032766A1

EP1032766A1 - Fan wheel

Info

Publication number: EP1032766A1
Application number: EP98962382A
Authority: EP
Inventors: Hermann Stahl; Erwin Wolf
Original assignee: Hermann Stahl GmbH
Current assignee: Hermann Stahl GmbH
Priority date: 1997-11-21
Filing date: 1998-11-21
Publication date: 2000-09-06
Anticipated expiration: 2018-11-21
Also published as: DE59803561D1; DE19751729C2; DE19751729A1; WO1999027258A1; US6386831B1; EP1032766B1

Abstract

The invention relates to a fan wheel for a turbocharger. The fan wheel (1) consists of a base body comprising a central axis of rotation (5) formed by two congruent opposing cover discs (2, 3). Fan blades (6) are arranged between the front faces of the cover discs facing each other. The fan blades (6) are formed by a single piece on at least one of the cover discs (2, 3) and comprise an axial locating face (30) on which an opposing axial locating face (31) of the other cover disc (2, 3) is located. Fixing means are provided in the area of the locating faces (8, 9) for non-detachable interconnection of the cover discs (2, 3). In order to manufacture the fan wheel (1) without balancing, the cover discs (2, 3) are made of material that is suitable for stamping and the fan blades (6) are stamped axially from the material of a cover disc (2, 3). The edges (22a, 22b) between the plane of the cover disc (2, 3) and the side wall (19a, 19b) of the fan blade (6) standing substantially at a right angle in relation to the plane of the cover plate (2, 3) and the edge (21a, 21b) between the side wall (19a, 19b) of the locating face (30, 31) are rounded with a radius (R1, R2) of approximately 0.5 to 2 mm.

Description

Fan wheel

The invention relates to a fan wheel for conveying an air mass, in particular for a turbocharger, fan or the like. According to the preamble of claim 1.

Such a known fan wheel is known from DE 85 18 403. It consists of two cover disks approximately parallel to each other, between which the fan blades are arranged. Troughs are formed on one cover disk, which abut the other cover disk and thus form fan blades. To connect the cover plates, they are glued, welded or connected with external rivets in the area of the contact surfaces. The fan wheels built in this way must be balanced before start-up, as tolerances, material accumulations etc. cause imbalances that occur at high speeds in the turbocharger, e.g. 20,000 rpm must be equalized. The production of fan wheels of this type is therefore laborious, labor-intensive and expensive.

The invention has for its object to design a fan wheel of the generic type in such a way that it can be manufactured in a few simple manufacturing steps and assembled ready for use without balancing.

The object is achieved according to the characterizing features of claim 1. The use of an embossable material, such as deep-drawn sheet metal, namely steel sheet, stainless steel sheet, aluminum sheet or the like, also allows the fan blades to be embossed over part or over their entire axial height in the production of the cover disks. The amount of material is not changed by this non-cutting forming and punching, so that a final balancing can be omitted. Due to the one-piece design of the fan blade with the cover plate, only a few fastening points are necessary. The fan wheel is composed of only two parts axially, an axial contact surface of one cover plate being firmly in contact with an axial contact surface of the other cover plate. All edges exposed to the air flow are rounded, so that there is a high delivery rate with low noise.

The cover disks are expediently connected to one another in the area of the contact surfaces. Connection points are advantageously provided only in the area of the contact surfaces.

In an advantageous embodiment of the invention, fixing openings can be made on the contact surface of the one cover disk. Fixing lugs are formed on the opposite contact surface of the second cover plate, for example by pulling or extrusion. When the cover disks are aligned with one another, the fixing lugs engage in the opposite fixing opening, which advantageously have a countersink on the rivet head side, which ensures that the parts are correctly positioned. Since the fixing lugs and fixing openings are only provided in the contact surfaces of the fan blades, the correct rotational position of the cover plates relative to one another is determined at the same time, so that all fan blades of one cover plate, which are evenly distributed over the circumference, bear against the associated contact surfaces of the other cover plate. The fixing lugs are expediently formed into rivet bolts by extrusion, with which the cover disks are connected to one another in the area of the contact surfaces. Since no material is added to this connection technology, balancing measures that are otherwise necessary are not necessary.

The fan blades are expediently formed by the walls of an embossed bead, the bead also contributing to stiffening the cover plate. The beads are advantageously closed at the ends and extend in the radial direction over only part of the radius of the cover disk. The radial ends of the beads or the fan blades have a rounded end face.

A cover plate is advantageously provided with a waffle-like or scale-like embossment, in particular on the inside facing the air flow. A better flow of the air flow conveyed by the fan wheel can thus be achieved. The waffle-like embossing also avoids tension in the cover plate, which ensures its flat, distortion-free shape. Even at high speeds there are no imbalances. The scale-like embossing also eliminates the need for subsequent leveling of the cover plate after the beads forming the ventilation blades have been stamped out and can also offer flow-related advantages and dissipate heat. Further features of the invention result from the further claims, the description and the drawing, in which exemplary embodiments of the invention described in detail below are shown. Show it:

1 is a plan view of a fan wheel according to the invention,

2 shows a section along the line II-II in FIG. 1,

3 is a plan view of a cover plate of the fan wheel with pronounced parts of the fan blades,

4 shows an enlarged view of the detail Z from FIG. 2 with fixing lugs for positional alignment,

5 shows detail 7 from an enlarged view

2 with fixing lugs designed to form rivet bolts and a rivet countersink on the rivet head side,

6 is an enlarged view of the detail Z from FIG. 2 with cover plates connected in a form-fitting manner by pushing through,

Fig. 7 is an enlarged view of the detail Z in Fig. 2 with cover plates riveted by own material of different thicknesses.

1 shows a top view of a fan wheel 1 for conveying an air mass, as is used in particular in a turbocharger. The fan wheel according to the invention can also be used advantageously in other technical fields, for example as a fan, cooling air blower or the like. The fan impeller 1 essentially consists of two cover disks 2 and 3 which are congruent with one another and, in the exemplary embodiment, are parallel and each have a central opening 4, 40 for attachment to, for example, a hub. The central openings 4, 40 are coaxial to the axis of rotation 5 of the base body or the fan wheel 1. The cover plates 2, 3 advantageously have the same material thickness; 1 and 7 different material thickness (Fig. 2) are shown, the smaller opening 40 in the z. B. thicker cover plate 3 can be provided. For attachment to the end of a shaft 41, this engages through the larger opening 4 in the fan wheel 1 and rests with an annular shoulder 42 on the cover plate 3. A threaded section 43 of the shaft 41 protrudes through the opening 40 of the cover disk 3, onto which a fastening nut 44 is screwed and the fan wheel 1 is fixed in a rotationally fixed manner on the shaft 41.

As further shown in FIG. 2, fan blades 6 are provided between the mutually facing end faces 12 and 13 of the cover disks 2 and 3, which are slightly curved in the running direction 7 (FIG. 1). The arrangement is such that when the fan wheel 1 rotates in the running direction 7, air is sucked in through the central opening 4 of the one cover plate 2 and flows radially outward. It is therefore a fan wheel with axial inflow and radial outflow.

As can be seen from FIG. 2, a fan blade 6 is formed in one piece with the cover plate 2 or 3, at least over part 6a, 6b of its height B measured in the direction of the axis of rotation 5. In the exemplary embodiment according to FIG. 2, the height B of the fan blade 6 is half B / 2 on the cover plate 2 and half B / 2 on the cover plate 3 molded in one piece. Different widths of the parts 6a, 6b forming the fan blade 6 can also be expedient.

In the exemplary embodiment shown, the fan blades 6 are formed as embossed beads 10 axially from the material of the cover disks 2, 3, the cover disks 2, 3 being made of an embossable material such as e.g. a deep-drawn sheet, steel sheet or stainless steel sheet. Designs made of aluminum sheets or aluminum alloys are also easy to implement; depending on the application, the material of the cover plates 2, 3 can also be a plastic, optionally a carbon fiber reinforced plastic. The radial extent of the beads 10 advantageously lies within the inside or outside diameter of the cover plate, the ends of the beads 10 being closed.

For a simple assembly, it is expedient to design the cover plates 2 and 3 to be approximately the same in mirror symmetry with respect to the parting plane 11. As shown in FIG. 2, the beads 10, which are embossed in one piece from the cover disk 2, consist of a flat base 8, 9 serving as contact surface 30, which is connected to the cover disk 2, 3 via side walls 19a, 19b. Thus, when the fan wheel 1 is joined together, the cover disks 2 and 3 can be easily axially joined, the bottom 8 of a fan blade of the one cover disk 2 abutting a bottom 9 of a mirror-symmetrically shaped fan blade of the other cover disk 3. The bottoms 8, 9 are formed with a width of 1 to 10 mm, preferably 2 to 5 mm. As shown in FIGS. 4 and 5, the embossed beads 10 of the air blades are designed in such a way that no edges disturbing the air flow occur. Correspondingly, the side walls 19a, 19b connect to the base 8, 9 via a rounded edge 21a, 21b. The inner radius R1 of the bead 10 is preferably approximately 0.5 to 2.5 mm, preferably 0.5 mm, while the outer radius R2 of the edge 21a, 21b exposed to the air flow is approximately 0.5 to 2 mm, preferably 1 mm is. In the same way, the edge 22a, 22b is between the side wall and the cover disk 2, 3 with an outer radius R2 of 0.5 to 2 mm, preferably 1 mm and with an inner radius R1 exposed to the air flow of 0.5 to 2 mm, preferably 0.5 mm. It may be advantageous to round the edge 21a, 21b more than the edge 22a, 22b. The side walls 19a of the fan blades 6 embossed from the cover plate 2 advantageously have the same axial height B / 2 over their entire radial extent, each side wall being approximately at a right angle 32 to the plane of the cover plate 2, 3 or approximately at right angles to a plane , to which the axis of rotation 5 is perpendicular. 2 and 3 show that the radially outer ends of the fan blades 6 consist of the adjacent end faces 20a, 20b of the beads 10 of the ceiling panes 2 and 3. Each end face 20a, 20b is rounded with a radius of 1 to 4 mm, preferably 1.5 mm.

It may be expedient to design the beads 10 embossed from the cover disk 2 and 3 to form fan blades, for example with different radial lengths, with different heights measured in the circumferential direction or with a width that decreases or increases over the radial length. The contact surfaces 30, 31 formed on the bases 8, 9 lie parallel to a parting plane 11; the axis of rotation 5 is perpendicular to the parting plane 11. The height of the embossed beads 10 corresponds approximately to the height B / 2 of the blade part 6a, 6b of the fan blade 6 and is a maximum of 1 to 10 mm, preferably approximately 5 mm. The circumferential direction P (FIG. 1) of a bead 10 corresponds approximately to the circumferential thickness d (FIG. 3) of a fan blade 6.

The cover plates 2, 3 are permanently connected to one another in the area of the contact surfaces 30 and 31 of the fan blades 6, as a result of which the two cover plates 2, 3 form a common, non-detachable unit with the integral beads 10. In order to ensure correct alignment of the cover disks 2 and 3 with respect to one another, a fixing lug 35 (FIG. 4) is formed on a contact surface 30, which engages in a corresponding fixing recess or fixing opening 36 in the other contact surface 31. In this congruently aligned position, the cover disks 2, 3 are connected to one another in the region of the contact surfaces 30, 31.

5, the fixing lugs are formed into rivet bolts 17. Provided on one contact surface 30 of the fan blade 6 is the rivet bolt 17 which engages through a corresponding rivet opening 16 in the contact surface 31 of the other part and is deformed to form a non-detachable connection of the cover disks 2 and 3 to form a rivet head 18. The rivet opening 16 is advantageously provided with a countersink 14 on the end facing the rivet head 18. As a result, the length of the rivet bolt 17 can be made shorter, so that it can be driven out of the material of the cover plate safely. This riveting with own material is advantageous with regard to balancing criteria with simple manufacture. <Pf DJ tr * Φ $: 53 01 DJ 03 MJ DJ C tr * f <d N bd iQ 01 er Ό 33 φ P- DJ dd: PO P- d Ω 3 P- Φ 3 o 3 3 d: d: o 3 *: <3 Φ Φ dd Φ P-

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Claims

Expectations

Fan wheel for conveying an air mass, in particular for a turbocharger, a fan or the like, consisting of a base body with a central axis of rotation (5), the base body consisting of two cover disks (2, 3) lying approximately congruently opposite one another, between their facing one another End faces (12, 13) are arranged fan blades (6) which are integrally formed on at least one cover plate (2, 3) and have an axial contact surface (30) on which an opposite axial contact surface (31) of the other cover plate (2, 3) and with fastening means provided in the area of the contact surfaces (8, 9) for the permanent connection of the cover disks (2, 3) to one another, characterized in that the cover disks (2, 3) consist of an embossable material and the fan blades (6 ) are axially formed from the material of a cover plate (2, 3), the edge (22a, 22b) between the plane of the cover plate (2, 3) and the side wall (19a, 19b) of a fan blade (6) at right angles to the plane of the cover plate (2, 3) and the edge (21a, 21b) between the side wall (19a, 19b) of the contact surface (30, 31) with a radius (Rl , R2) is rounded from about 0.5 to 2 mm.

2. Fan wheel according to claim 1, characterized in that the material is a deep-drawn sheet, in particular a steel sheet or aluminum sheet.

3. Fan wheel according to one of claims 1 to 2, characterized in that the cover plates (2, 3) are positively connected to one another.

4. Fan wheel according to one of claims 1 to 3, characterized in that the cover plates (2, 3) over in the region of the contact surfaces (30, 31) provided from the material of the cover plates (2, 3) formed fixing lugs (35) to each other are aligned.

5. Fan wheel according to claim 4, characterized in that the fixing lugs are designed as rivet bolts (17) which engage in corresponding rivet openings (16) of the opposite contact surface (31) and are riveted.

6. Fan wheel according to one of claims 1 to 3, characterized in that the cover disks (2, 3) in the region of the contact surfaces (30, 31) are connected to one another by pressure joining or clinching.

7. Fan wheel according to one of claims 1 to 6, characterized in that a fan blade (6) from a from the plane of the cover plate (2, 3) embossed bead (10) is formed.

8. Fan wheel according to one of claims 1 to 7, characterized in that the height (B / 2) of the bead (10) is 1 to 10 mm, preferably 5 mm.

9. Fan wheel according to one of claims 1 to 8, characterized in that a bottom (8, 9) of the bead (10) forms the contact surface (30, 31) and has a width of about 1 to 10 mm, preferably about 5 mm .

10. Fan wheel according to one of claims 1 to 9, characterized in that the approximately perpendicular to the plane of the cover plate (2, 3) lying side walls (19a, 19b) of the embossed bead (10) with an outer radius (R2) of about 0 , 5 to 1 mm to the bottom (8, 9) and with an inner radius (R1) of about 0.5 to 1 mm to the level of the cover plate (2, 3).

11. Fan wheel according to one of claims 1 to 10, characterized in that the end face (20a, 20b) of the bead (10) is rounded with a radius of about 1 to 4 mm, preferably about 1.5 mm.

12. Fan wheel according to one of claims 1 to 11, characterized in that the cover plate (2, 3) has a scale or waffle-like embossing (25), which is preferably on the inner end face (12, 13) of the cover plate (2, 3rd ) is arranged.

13. Fan wheel according to one of claims 1 to 12, characterized in that the contact surface (30, 31) extends over the entire radial length of the fan blade (6).

14. Fan wheel according to one of claims 1 to 13, characterized in that a part (6a) of the fan blade (6) in one piece with the one cover plate (2) and another part (6b) of the fan blade (6) is formed in one piece with the other cover plate (3).

15. Fan wheel according to one of claims 1 to 14, characterized in that the cover plates (2, 3) are of mirror-symmetrical design.

16. Fan wheel according to one of claims 1 to 15, characterized in that the cover plates (2, 3) have the same material thickness.