DE102017211800A1 - Fan, in particular axial, radial or diagonal fan - Google Patents

Abstract

A fan, in particular axial or radial or diagonal fan, comprising an external rotor motor with rotating rotor and an impeller, wherein the impeller rotatably connected to the rotor, and wherein between the rotor and the impeller acting centering means are provided so that the axes of rotor and run impeller as coaxially, is characterized in that the centering comprise centering elements that brace against each other without play during assembly by moving the impeller relative to the rotor in the axial direction or by rotation of the rotor and impeller, if necessary tense.

Description

The present invention relates to a fan, in particular axial, radial or diagonal fan, comprising an external rotor motor with rotating rotor and an impeller, wherein the impeller is rotatably connected to the rotor, and wherein between the rotor and the impeller acting centering means are provided so the axes of rotor and impeller run as coaxially as possible.

This is about the centering of axial, radial or diagonal impellers with the drive unit, i. with the rotor of the motor. In the direct connection of the rotor of an external rotor motor with the bottom disk, for example a radial impeller or with the interposition of an adapter flange, the two axes of the rotary body - rotor of the external rotor motor or adapter flange and impeller - must be as coaxial. If the coaxiality is not produced during assembly, corresponding deviations have a negative effect on the unbalance during operation. The balancing process is on top of that difficult. In the prior art known from the practice one tries to achieve the coaxiality via so-called centering diameter or centering cam whose diameter must be adapted to each other. By such measures, however, the Koaxialiät is achieved only conditionally, with a backlash-free centering is virtually eliminated. Ultimately, there is always a game with the known disadvantages.

The invention is therefore the object of a fan of the generic type to design and further develop that it is possible with simple structural means to produce the required coaxiality between the bodies of revolution, wherein occurring in the prior art game of centering should be at least largely eliminated , In addition, an alternative to competitive products should be created.

The above object is solved by the features of claim 1, according to which the generic fan is characterized in that the centering comprise centering, which in the assembly of the rotary body by moving the impeller relative to the rotor in the axial direction or by rotating the rotor and impeller against each other align without play, if necessary tighten. By this measure, a centering system is created that produces exact coaxiality of the rotating body and eliminates the usual game of centering.

The centering elements are associated with the impeller and the rotor or an adapter flange acting therebetween, the centering elements interacting in pairs. The centering elements may comprise wedges and wedge surfaces, by means of which it is possible to clamp the rotary bodies against one another, namely by rotating the rotary bodies relative to one another.

At this point it should be noted that the impeller is regularly produced by injection molding. When using different materials and processing in identical tools must be expected with different shrinkage values, which require considerable play in conventional assembly of the rotary body. By using the centering elements, the influence of possible shrinkage values on the game can be eliminated.

It is also conceivable that the centering elements are designed such that they engage in pairs. For example, it is conceivable that the centering elements form a kind of bayonet connection.

Within the scope of a particularly simple technical embodiment, it is conceivable to design the centering elements as centering pins, centering pins, centering screws or centering ribs which engage in recesses or slots or oblong holes of the opposing component, so that the centering elements also interact in pairs. If the mutual engagement made, the rotational body are rotated against each other and clamped according to the configuration of the centering against each other, wherein the mutual engagement during rotation of the centering causes adhesion and possibly positive locking.

In principle, it is conceivable that the rotary bodies - rotor and impeller - are connected directly to each other without play, namely by bracing by means of the centering. It is also conceivable that an adapter flange is interposed, which can be screwed to the rotor or the impeller. In such a case, the adapter flange would be equipped with the necessary centering elements and could be made available for certain sizes as a kind of universal flange.

The co-operating centering elements form a guide during assembly of the rotary body and ensure mutual clamping. It is advantageous if at least three pairs of cooperating centering elements are provided, which are formed along the circumference of the rotor and impeller or adapter flange, opposite one another, preferably equidistant from each other. Also by this measure the coaxiality is guaranteed.

It is further advantageous if the centering elements are designed and aligned with one another in such a way that due to self-locking an automatic release is precluded. By this measure, the safe installation is greatly facilitated.

Now fans can alternatively be designed clockwise or anti-clockwise. In that regard, it may be advantageous that the receiving centering element on one side of the rotary body can accommodate and clamp the male centering on the other side of the rotary body selectively from both sides, namely either by a clockwise rotation or by a left-hand rotation of the rotor and impeller. By this selective engagement in one direction and in the other direction, a twisting is possible by selectively twisting in both directions, whereby a secure connection is again favored.

Finally, it is conceivable that the centering elements are provided with a latch, after which the engaging centering element after reaching the tension, i. in the end position, locked in the receiving centering. As a result, a second security is created.

• 1a in einer perspektivischen Ansicht einen für sich gesehen bekannten Außenläufermotor mit drehendem Rotor und Adapterflansch,
• 1b den Gegenstand aus 1a, wobei der Adapterflansch separat gezeigt ist,
• 1c in einer Vorderansicht den Gegenstand auf 1a,
• 1d in einer schematischen Ansicht das Detail X aus 1c mit einer Zentrierung über Zentriernocken oder über einen Zentrierdurchmesser,
• 2a in einer perspektivischen Ansicht eine für sich gesehen bekannte Baugruppe aus Rotor und Laufrad im montierten Zustand,
• 2b den Gegenstand aus 2a, wobei dort das Laufrad separat gezeigt ist,
• 2c in einer schematischen Draufsicht die Zentrierung über einen Zentrierdurchmesser mit Spiel,
• 2d in einer schematischen Ansicht das Detail X aus 2c, wonach das Spiel durch Pfeile angedeutet ist,
• 3a in einer perspektivischen Ansicht ein Ausführungsbeispiel eines Laufrads eines erfindungsgemäßen Ventilators,
• 3b den Gegenstand aus 3a in einer Vorderansicht,
• 3c in einer Detailansicht ein zum Verspannen dienendes Zentrierelement am Laufrad,
• 4a in einer perspektivischen Ansicht ein weiteres Ausführungsbeispiel eines Adapterflanschs mit Zentrierelement,
• 4b den Gegenstand aus 4a in einer Vorderansicht,
• 4c in einer schematischen Ansicht das Detail X aus 4a,
• 5a in einer perspektivischen Ansicht, im Schnitt senkrecht zur Rotationsachse, die Anordnung von Laufrad und Adapterflansch im nicht zentrierten Zustand,
• 5b in einer schematischen Ansicht das Detail X aus 5a,
• 5c den Gegenstand aus 5a im zentrierten Zustand und spielfrei,
• 5d in einer schematischen Ansicht das Detail X aus 5c, ohne Spiel,
• 6a ein Ausführungsbeispiel eines Rotors mit Zentrierstiften,
• 6b ein Ausführungsbeispiel eines Adapterflanschs mit kreiskeilartig angeordneten Langlöchern zum Eingriff der Zentrierstifte,
• 6c die Anordnung von Rotor und Adapterflansch im zusammengebauten, verspannten und spielfreien Zustand,
• 6d in einer schematischen Ansicht Detail X aus 6c, und
• 7 in einer Detailansicht die Zentrierelemente gemäß den Darstellungen aus 5c.

There are now various possibilities for designing and developing the teaching of the present invention in an advantageous manner. For this purpose, on the one hand to the claims subordinate to claim 1 and on the other hand to refer to the following explanation of preferred embodiments of the invention with reference to the drawings. In conjunction with the explanation of the preferred embodiments of the invention with reference to the drawings, generally preferred embodiments and developments of the teaching are explained. In the drawing show

• 1a in a perspective view of a known per se known external rotor motor with rotating rotor and adapter flange,
• 1b the object out 1a with the adapter flange shown separately,
• 1c in a front view the object 1a .
• 1d in a schematic view the detail X out 1c with a centering via centering cams or via a centering diameter,
• 2a in a perspective view of a known per se assembly of rotor and impeller in the assembled state,
• 2 B the object out 2a , where the impeller is shown separately there,
• 2c in a schematic plan view, the centering over a centering diameter with game,
• 2d in a schematic view the detail X out 2c according to which the game is indicated by arrows,
• 3a in a perspective view of an embodiment of an impeller of a fan according to the invention,
• 3b the object out 3a in a front view,
• 3c in a detail view, a centering element serving for bracing on the impeller,
• 4a in a perspective view of another embodiment of an adapter flange with centering,
• 4b the object out 4a in a front view,
• 4c in a schematic view the detail X out 4a .
• 5a in a perspective view, in section perpendicular to the axis of rotation, the arrangement of impeller and adapter flange in the non-centered state,
• 5b in a schematic view the detail X out 5a .
• 5c the object out 5a in the centered state and play-free,
• 5d in a schematic view the detail X out 5c , without play,
• 6a an embodiment of a rotor with centering pins,
• 6b An embodiment of an adapter flange with circular wedge-like slots arranged to engage the centering pins,
• 6c the arrangement of rotor and adapter flange in the assembled, tensioned and play-free state,
• 6d in a schematic view detail X out 6c , and
• 7 in a detailed view of the centering according to the illustrations 5c ,

1a shows in a perspective view the known from practice arrangement of a rotor 1 where to connect to a in 1a not shown impeller an adapter flange 2 is attached.

1b shows the item 1a , where the adapter flange 2 shown separately.

The 1c and 1d show the rotor 1 with attached adapter flange 2 , The centering takes place via centering cams 3 , The centering achieved in this way is play-related and can not guarantee 100% coaxiality.

2a shows the assembly from the 1a to 1d with mounted fan wheel 4 ,

2 B shows the arrangement on 2a , where the fan wheel 4 shown separately.

2c shows in a plan view of the arrangement 2a , in which 2d the unwanted play with two arrows implies.

3a shows the pure impeller 4 without adapter flange. There are circular wedge-like centering 5 provided, at least three in number, to ensure a uniform bracing.

3b shows the item 3a in a front view.

3c shows the circular wedge-like centering element 5 in detail.

4a shows in a perspective view an adapter flange 2 with centering elements 6 ,

4b shows the item 4a in a front view.

4c shows in detail the centering element 6 which is the adapter flange 2 assigned.

5a shows in a perspective view a fan 4 with adapter flange 2 in the non-centered state. Game is available. By twisting the parts along arrow 7 in the enlarged view according to 5b can eliminate the game, as in 5c and in the detail view 5d through the arrows 8th is shown. 5c shows the arrangement in the centered play-free state, wherein it is in the representation in 5d is a sectional view.

6a shows a further embodiment of a fan according to the invention with rotor 1 , where there is a flange 9 Pins 10 are arranged.

6b shows an adapter flange 2 with circular slotted holes 11 Is provided. Into the oblong holes 11 grab the centering pins 10 and it can be caused by mutual rotation of the two components a strain. The term "circular wedge-like" is to be understood in the broadest sense, for example also insofar as the end points of the rectilinear slots are located at different diameters.

6c shows the arrangement in the clamped state, 6d shows in detail the centering elements 6 namely the centering pin 10 and the slot 11 , wherein due to the circular wedge-like arrangement of the slot 11 a distortion by twisting the components takes place.

As shown in 7 the resulting skew angle of the centering is in the range of about 3 to 8 degrees, this angle is selected depending on the coefficient of friction. An automatic release after twisting should be prevented by self-locking.

In order to prevent an axial "pushing apart" of the parts during the twisting, the smallest possible draft angle or no draft angle is to be preferred.

The component contact ideally occurs via three linear contacts.

With regard to further advantageous embodiments of the teaching of the invention reference is made to avoid repetition to the general part of the specification and to the appended claims.

Finally, it should be expressly understood that the above-described embodiments of the teaching of the invention are only for the purpose of discussion of the claimed teaching, but do not limit these to the embodiments.

LIST OF REFERENCE NUMBERS

1

rotor

2

adapter flange

3

centering

4

fan

5

Centering element, wedge-shaped

6

Centering element ( 4 )

7

arrow

8th

arrow

9

flange

10

Centering

11

Long hole

12

arrow

Claims (10)

Fan, in particular axial or radial or diagonal fan, comprising an external rotor motor with rotating rotor and an impeller, wherein the impeller rotatably connected to the rotor, and wherein between the rotor and the impeller acting centering means are provided so that the axes of rotor and Run impeller as coaxially, characterized in that the centering centering comprise, which align during assembly by moving the impeller relative to the rotor in the axial direction or by rotation of the rotor and impeller against each other without play, if necessary, tense. Fan after Claim 1 , characterized in that the centering elements are associated with the impeller and the rotor and / or an adapter flange acting therebetween, wherein the centering elements cooperate in pairs. Fan after Claim 1 or 2 , characterized in that the centering elements comprise wedges and wedge surfaces. Fan after one of the Claims 1 to 3 , characterized in that the centering elements engage in pairs. Fan after one of the Claims 1 to 4 , characterized in that the centering elements form a kind of bayonet connection. Fan after one of the Claims 1 to 5 , characterized in that the centering centering pins, centering pins, centering or centering and for the engagement of the centering pins, etc. recesses, such as slots or slots, which cooperate in pairs. Fan after one of the Claims 1 to 5 , characterized in that at least three pairs of cooperating centering elements are provided, which are arranged along the circumference of the rotor and impeller and / or adapter flange, opposite each other, equidistant from each other. Fan after one of the Claims 1 to 7 , characterized in that the centering elements are designed and aligned with each other, that due to self-locking a selbstätiges release is excluded. Fan after one of the Claims 1 to 8th , characterized in that the female centering element can accommodate and clamp the male centering either from both sides, namely either by a clockwise rotation or by a left-hand rotation of the rotor and impeller. Fan after one of the Claims 1 to 9 , characterized in that the centering elements are equipped with a latch, after which the engaging centering locked after reaching tension in the receiving centering.

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