DE1949510A1 - Manufacturing process for radial impellers of miniature fans - Google Patents

Description

HANS MATERNA 7303 Neuhausen / Filder

Llndenetre8e55 I> / 4 ^ V 1 U

September 29, 1969

Applicant:

Hans Materna

7303 ffeuhausen / Filder

Mndenstrasse 55

Registration subject:

Manufacturing process for radial impellers of miniature fans.

Description.

The invention relates to a manufacturing method for radial impellers of miniature fans, in particular for radial impellers with a high pressure coefficient and a minimum of internal losses.

Radial impellers with pressures in the order of magnitude of 1 with delivery counts in the order of 0.05, have hub ratios less than 0.5? Further Typical features are backward curved blades, relatively small wheel widths and mostly conical cover disks. With such radial impellers, the loss of wheel friction, based on smooth wheel disks, is roughly equivalent to the useful power. Because the wheel friction losses due to unevenness on the wheel disks, e.g. due to the attachment of the blades easily 10 to 20 times the value of smooth wheel disks rise, is therefore for the named radial impeller «

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a manufacturing process to achieve the minimum of internal losses required., which allows the production of smooth bath disks and smooth blade surfaces on both sides.

It is known that the radial impellers of miniature fans, which have outer wheel diameters of the order of 100 mm and widths of the order of 10 mm, cannot be manufactured in one piece at tolerable expense. Since the attachment of the blades to the wheel disks by welding or soldering is too difficult in practice because of the small wheel widths, the known manufacturing processes focus on connecting the blades to the wheel disks by means of riveted or bending tab attachments attached to them. In this case, however, an optimally cost-effective production cannot be achieved because, in addition to the tools for the production of the individual parts, further tools or devices are required for the assembly. Unfavorable, is further that the cost increases for the balancing and the ψ alone forth possible from the wheel discs peripheral speed due to the limited overall strength by far can not be achieved. It is particularly disadvantageous that due to the protruding Uietsetzköpfe or bending tabs, the loss of wheel friction is very much greater than with smooth wheel disks.

The invention has the object, the production of To enable radial impellers for small fans so that b © i cost-effective production process both smooth

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Blade surfaces as well as smooth wheel disks on both sides result.

This object is achieved in that each of the two wheel disks together with one part each of the individual blade is produced, the sections of the blades are shaped so that two identical Sections either predominantly form-fitting with little blade surface overlap or predominantly as a result of Surface adhesion force-fit with large blade area overlap are joined together and preferably glued to one another.

According to a first embodiment example, one can proceed in such a way that the one wheel disk is together with the blades is made of one piece, with each blade as a section without the blade root rounding area for the other wheel disk and that the other wheel disk has the associated blade root rounding area for each individual blade, in which a groove is embedded in the width of the blade thickness, so that after the assembly of the two impeller parts a positive fit with respect to the radially acting forces results, and that also the fixed connection of the. both impeller parts with each other, depending on the material, is carried out either by gluing or by soldering or by welding. In a Modifications of this example are the groove in each blade root rounding area and the end of the associated one to be inserted therein Sdstouifelteilstücks dovetail-shaped, whereby there is a real form fit

109815/1124

A second embodiment is based on the fact that each of the two wheel disks with the same blade parts, each of which has half the blade thickness throughout » * is made from one piece, with each blade section without the blade root rounding area for the other wheel disk, and that also the fixed connection of the two Impeller parts with each other either through depending on the material Gluing or soldering or welding takes place. One A modification of this example is that each Sehaufel .teilstüek is carried out only about half its length with half the blade thickness and that this shortened blade section like a dovetail into the associated counterpart is used, which results in a real form fit.

Further designs according to the invention relate to the design options for the radial impellers for connection to the drive devices: Then, depending on the material, the impeller attachment is used required hub sleeve either pressed or cast or as a press-fit part in the manufacture of Radrückecheibe used; but instead can also be used if necessary the impeller shaft either pressed on or cast on or as a press-fit part in the manufacture of the wheel rear disc can be used.

According to the invention, the impeller parts can be milled or Syringes made of suitable plastics or metals or else

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by sintering from suitable metals or mineral Materials are manufactured,

Some embodiments of the invention are in the drawing shown and described in more detail below, E · show

1 shows a developed coaxial section through a radial impeller according to the first embodiment,

Pig, 2 an even section through a

Radial impeller according to the second embodiment,

Pig. 3 a further identical cut

by a radial impeller according to the third embodiment,

4a shows an axially perpendicular section through a

Radial impeller according to the fourth embodiment,

Pig, 4b one in relation to Flg. 4a vertical section through the radial impeller according to FIG Figure 4a.

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BAD ORJGJNAl

FIG. 1 relates to a radial impeller in a two-part design according to the first example. The Raddeekseheibe 2 is with the full-thickness saw blade sections 5 "which together in one Pieces are made, occupied. At the free end of each shovel part 5 the blade root rounding area is missing »The lad * The rear disk 1 has, with respect to the blade sections 5 identical Sehaufelfußrundungsbereiehe 3 with parallel-walled grooves. The assembly of the two wheel parts, in which there is a form fit with respect to the radially acting forces, either by gluing or soldering or Welding done; the aforementioned positive locking prevents the occurrence of shear forces in the connecting seams. Because of this you can limit yourself to this, for example Connection seams only in a small area each to put on the shovel ends.

FIG. 2 shows a modification of the example of FIG. 1, in which the wheel back disk 1 with blade root rounding areas 4 is provided with dovetail-shaped courage. at The assembly of the two impeller parts results in a form fit both in the radial and in the axial direction, so that the additional connection by gluing etc. becomes superfluous.

The Pig. 3 relates to a radial impeller, again in a two-part design, according to the second example. The wheel cover disk 2 is filled with the blade sections through half-thickness 6, which are made together in one piece; At the free end of each Sohaufeltellatüok · »6 the blade root rounding is missing. The Radrüokachtib · 1 wtiet per production in tine »

logged / in

Piece on the identical blade sections 6a, on whose free ends, in turn, the blade root rounding areas are missing. The respective missing blade root rounding areas are components the other wheel disc. The assembly of the two impeller parts can again either be done by gluing or soldering or welding. Because of the shovel trim, the connection seam are relieved in the radial direction, these connecting seams can in turn in a small area be placed on the blade ends.

The -b'ig. 4a and fig. 4b show a modification of the example the pig. 3. It consists in the fact that each of the blade sections 7, which together with the wheel cover disc 2 is in one piece Form a manufactured XE part, only about half the length of the complete blade and half the blade thickness is and also has no Sehaufelfurundungsbereich at the free end, and that further the blade section 7 is dovetail-like in 'the associated counter-scoop elteilstück 8 is used. The counter-vane sections 8 are in this Example with the wheel back disk 1 manufactured together as one piece, with the respective all-round blade root rounding area 9 in the middle section at the same time the free end of the respective blade section 7 completes. When assembling of the two impeller parts results in a complete form fit, so that the additional connection is made by gluing etc. becomes superfluous.

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With the manufacturing method according to the invention, the first result is as advantageous that basically with only two different tools the "two impeller parts, which are in the Examples are described and can be made of any of the suitable materials, can be manufactured inexpensively can. A considerable advantage is also seen in the fact that these two impeller parts can also be used without the aid of joining techniques such as gluing or soldering or welding can be assembled, the resulting radial impeller also meets high strength requirements. As a special one The advantage is that all surfaces of the wheel disks and the blades are completely smooth, i.e. without disturbing protrusions or similar are carried out, so that there is only the inevitable minimum in the wheel friction losses.

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Claims (8)

7303 Neuhaueen / Filder 1Π / ηΓ1Π Undonstress 55 I> ί * t C »O I (J J September 29, 1969 Applicant: Hans Materna 7305 Neuhausen / Pilder Lindenstrasse 55 Registration subject: Manufacturing process for radial impellers for miniature fans. Patent claims » Manufacturing process for radial impellers of miniature fans, in particular for radial impellers with a high pressure coefficient and a minimum of internal losses, characterized in that each of the two, wheel disks together is made with one section of the individual blade, the sections of the blades being shaped in this way are that in each case two identical sections either predominantly form-fitting with little blade surface overlap or mainly as a result of the surface adhesion to be achieved, force-fit with large blade surface overlap are joined together and preferably glued to one another. 2. Manufacturing method according to claim 1, characterized in that that the one wheel disk with the blades are manufactured together from one piece, with each blade as a part without the blade root rounding area for the other 10 9815- / 1124 ßAD ORIGINAL ι * ! Is wheel disc, and that the other wheel disc for each individual blade has the associated blade root rounding area, in which a groove in the width of the Blade thickness is recessed, so that after assembly of the two impeller parts results in a form fit with respect to the radially acting forces, and that also the Fixed connection of the two impeller parts to one another either by gluing or soldering, depending on the material or by welding. 3. Manufacturing method according to claim 1 and 2, characterized in that that the anger in each root area and the end of the associated blade part to be inserted therein tüeks are dovetail-shaped, whereby a real conclusion results. 4. Manufacturing process according to claim 1, characterized in that each of the two wheel disks with the same blade sections, each having half the blade thickness throughout, is made from one piece, each Blade section is without the blade root rounding area for the other wheel disk, and that also the fixed connection of the two impeller parts to one another, depending on the material, either by gluing or soldering or by Welding takes place. 109815/1124 5. Manufacturing method according to claim 1 and 41, characterized in that that each blade section is only approximately half its length with half the blade thickness and that this shortened blade part is dovetail-like inserted into the associated counterpart which results in a real Pormschluss. 6. Manufacturing process according to claim 1 to 5 »characterized in that that depending on the material used to mount the impeller required hub bushing either pressed or cast on or as a press-fit part in the manufacture of the Wheel rear disc is used. 7. Manufacturing process according to claim 1 to 5 »characterized in that that if necessary, the impeller shaft is either pressed or cast or as a press-fit part in the Manufacture of the rear wheel disc is used. 8. Manufacturing method according to claim 1 to 7, characterized in that that the impeller parts by pressing or injection molding from suitable plastics or metals or by Sintering made of suitable metals or mineral materials. 10 9 815/1124 & AD ORIGINAL Λ. Blank page