EP2436933B1 - Support frame for axial fan - Google Patents

Description

The invention relates to a support frame for mounting on a circuit board or the like.

It is known to directly cool areas of a printed circuit board by means of small and very small fans where a lot of heat is generated. Such areas are usually referred to as "hot spots".

The disadvantage here is that the surface on which such a fan is mounted is no longer available for components like that DE 195 03 521 A1 shows. Another disadvantage is that the cooling air flow generated by conventional small fans is not very suitable for near-surface direct cooling on printed circuit boards because of its shape.

The US 6,130,820 describes a three-legged frame with which a small fan is attached at a predetermined distance above a circuit board. The support frame is spider-shaped with a receiving block and support elements arranged thereon for fastening to the printed circuit board. The mounting block has a recess in which a device fan is arranged.

Furthermore, a support frame relevant to the prior art for mounting on a printed circuit board is from the document US 5,990,582 A known.

It is therefore an object of the invention to provide a new arrangement for cooling a printed circuit board or the like.

According to the invention, this object is achieved by a support frame for mounting on a printed circuit board, according to claim 1. Here, a support frame is provided to which a fan can be attached. This fan generates an air flow which is particularly suitable for cooling a printed circuit board, and it is possible to arrange and cool components on a printed circuit board even below such a support frame. Components with high heat generation can e.g. be placed directly at the fan in the strongest airflow. This can either be directed towards the circuit board or away from it in order to extract warm air from the circuit board.

Such a support frame can be mounted easily and foolproof and is very stably attached to the circuit board after its assembly.

Fig. 1

einen schematischen Schnitt durch eine erfindungsgemäße Anordnung mit einem Tragegestell, einem daran befestigten Kleinlüfter, sowie einem Luftleitelement zur Umlenkung des vom Lüfter erzeugten Luftstroms,

Fig. 2

eine Ansicht von schräg unten auf den Lüfter der Fig. 1, mit einer teilweisen Schnittdarstellung der elektrischen Verbindungselemente des Kleinlüfters,

Fig. 3

eine teilweise geschnittene Seitenansicht der Anordnung nach den Figuren 1 und 2, welche hier nach ihrer Montage auf einer Leiterplatte dargestellt ist,

Fig. 4

eine Darstellung der Einzelheit II der Fig. 2,

Fig. 5

eine raumbildliche Darstellung eines Tragegestells und seines Luftleitglieds 5, aber vor der Montage des Kleinlüfters, und gesehen von schräg oben,

Fig. 6

eine raumbildliche Darstellung analog Fig. 5, aber gesehen von unten, also von der Leiterplattenseite her,

Fig. 7

eine auseinander gezogene Darstellung einer Leiterplatte, eines Tragegestells, eines Lüfters, und der elektrischen Anschlusseiemente dieses Lüfters,

Fig. 8

eine Variante zu Fig. 3, bei der anstelle eines Rasthakens eine runde Doppelfeder verwendet wird, welche eine Ringnut hat, die in eine runde Bohrung 70 der

Fig. 9 bis 23

verschiedene Varianten der bei den Fig. 1 bis 8 verwendeten Luftleitglocke; diese Varianten ermöglichen es, auch elektronische Bauelemente, welche direkt unter dem Tragegestell angeordnet sind, mit einem vorgegebenen Anteil des vom Kleinlüfter erzeugten Kühlluftstroms zu kühlen,

Fig. 24

eine stark vergrößerte, auseinandergezogene Darstellung eines anderen Ausführungsbeispiels einer erfindungsgemäßen Anordnung mit einem Tragegestell und einem Kleinlüfter, der mit einer Platine für seinen elektrischen Anschluss versehen ist und der, einschließlich Platine, an diesem Tragegestell befestigt wird, und

Fig. 25

eine raumbildliche Darstellung der Anordnung gemäß Fig. 24 in einem Teilschnitt, gesehen längs der Linie XXV-XXV der Fig. 24, wobei die Platine in ihrem montierten Zustand, jedoch ohne den Lüfter, dargestellt ist.

Further details and advantageous developments of the invention result from the exemplary embodiments described below and shown in the drawing, which are in no way to be understood as a restriction of the invention, and from the subclaims. It shows:

Fig. 1

2 shows a schematic section through an arrangement according to the invention with a carrying frame, a small fan attached to it, and an air guide element for deflecting the air flow generated by the fan,

Fig. 2

a view from below of the fan of the Fig. 1 , with a partial sectional view of the electrical connection elements of the small fan,

Fig. 3

a partially sectioned side view of the arrangement according to the Figures 1 and 2 , which is shown here after mounting on a printed circuit board,

Fig. 4

a representation of the detail II of the Fig. 2 ,

Fig. 5

a spatial representation of a support frame and its air guide 5, but before the assembly of the small fan, and seen obliquely from above,

Fig. 6

a spatial representation analog Fig. 5 , but seen from below, i.e. from the PCB side,

Fig. 7

an exploded view of a circuit board, a support frame, a fan, and the electrical connection elements of this fan,

Fig. 8

a variant too Fig. 3 , in which a round double spring is used instead of a latching hook, which has an annular groove which in a round bore 70 of the

9 to 23

different versions of the 1 to 8 air baffle used; these variants make it possible to also cool electronic components, which are arranged directly under the support frame, with a predetermined proportion of the cooling air flow generated by the small fan,

Fig. 24

a greatly enlarged, exploded view of another embodiment of an arrangement according to the invention with a support frame and a small fan, which is provided with a circuit board for its electrical connection and which, including the circuit board, is attached to this support frame, and

Fig. 25

a spatial representation of the arrangement according Fig. 24 in a partial section, seen along the line XXV-XXV the Fig. 24 , wherein the board is shown in its assembled state, but without the fan.

In the figures, the same reference symbols denote the same or equivalent elements. Terms like above, below, left, right refer to the respective figure.

Fig. 1 shows a schematic longitudinal section through an arrangement 1 according to the invention. Its main components are a fan 3 with a fan wheel 31, the fan blades of which are shown at 32, and with an electric motor 33 for driving the fan wheel 31. Furthermore, the arrangement 1 has a carrying frame 4, which carries the fan 3 and to which it is attached. Support elements 41a and latching elements 41b are formed on the support frame 4. By means of the locking elements 41b, the support frame 4 can be fastened on a printed circuit board 2 by clipping on. Components 21 to be cooled are shown schematically on the printed circuit board 2. Fig. 8 shows an alternative, preferred type of fastening on the printed circuit board 2.

The fan 3 is arranged with its fan wheel 31 in such a way that on its side C facing away from the printed circuit board 2 it sucks in an air flow with a direction essentially perpendicular to the printed circuit board 2 (direction of the axis of rotation A of the fan 3). At least part of this air flow is through an air guide element 5, which has approximately the shape a bell has deflected so that this air flow runs approximately parallel to the circuit board 2 and thereby optimally cools the components 21.

• Sie ermöglicht durch die Rastelemente 41b und die Abstützelemente 41a bzw. die Rastfüße 80 gemäß Fig. 8 eine sehr schnelle Montage an der Leiterplatte 2.
• Sie bildet ein Distanzglied, welches den Lüfter 3 in einem gewünschten Abstand von der Leiterplatte 2 hält.
• Sie bildet eine äußere Umhüllung, nämlich einen sogenannten Venturikanal, für die Flügel 32 des Lüfters 3, d.h. sie komplettiert den Lüfter 3 zu einem Gerätelüfter üblicher Bauart.
• Sie formt den Luftstrom so, dass die Kühlung der Bauelemente 21 auf.der Leiterplatte 2 optimiert wird.
• Sie reduziert die Fläche der Leiterplatte 2, weil auch unterhalb der Anordnung 1 Bauelemente 21 auf der Leiterplatte 2 montiert werden können, z.B. Bauelemente mit geringer Wärmeerzeugung, oder Bauelemente, für welche ein Teil des Luftstroms zur Kühlung abgezweigt wird, wie das nachfolgend anhand der Fig. 9 bis 23 erläutert wird.

The arrangement 1 therefore has a multiple function:

• It is made possible by the latching elements 41b and the supporting elements 41a or the latching feet 80 according to FIG Fig. 8 very quick assembly on the printed circuit board 2.
• It forms a spacer which keeps the fan 3 at a desired distance from the circuit board 2.
• It forms an outer casing, namely a so-called Venturi channel, for the blades 32 of the fan 3, ie it completes the fan 3 to form a device fan of the usual type.
• It shapes the air flow so that the cooling of the components 21 on the circuit board 2 is optimized.
• It reduces the area of the printed circuit board 2, because components 21 can also be mounted on the printed circuit board 2 below the arrangement 1, for example components with low heat generation, or components for which a part of the air flow is branched off for cooling, as is shown below with reference to FIG 9 to 23 is explained.

The ends 44 of the support elements 41a serve to support the arrangement 1 on the circuit board 2. The latching elements 41b each have a latching hook 43 at their ends for engaging behind a recess 22 in the circuit board 2. The support elements 41a have a positioning extension 44 for fixing the position on an associated, complementary recess 23 of the circuit board 2. This allows a simple, reversible assembly of the arrangement 1 on a circuit board 2. The electrical connection of the electric motor 33 can be carried out by soldering in the solder bath together with the soldering of the components 21. For this purpose, the electric motor 33 is electrically connected to wire connections 61 by means of a circuit board 6. This makes it possible to use normal fans with standardized electrical connections. The circuit board 6 rests on a flange or support member 45 of the support frame 4, which also carries the fan 3. In the assembled state, the ends 62 of the wire connections 61 are soldered to conductor tracks on the circuit board 2.

How Fig. 5 shows, the support member 45 has an inner raised edge 48 and an outer raised edge 49, which serve to receive the board 6. The latter has, as in Fig. 7 a radially extending connecting part 64, and this is interrupted by an interruption 49a ( Fig. 5 ) of the outer edge 49 guided radially outwards and with the vertically extending connecting lines 61 connected. The recess 48a in the inner edge 48 expands to fasten the motor 33 to the support member 45.

How Fig. 8 shows, one can use, for example, three connecting lines 61. The electronic components for the motor 33, for example a Hall sensor and a commutation module, are located in the circuit board 6, and therefore this has a predetermined position relative to the motor 33. The power supply to the circuit board 6 and to the motor 33 takes place via the radial connecting part 64.

It should be pointed out here that an electronically commutated mini fan has very small dimensions. For example, an electronically commutated DC axial fan of the 250 series from ebm-papst has dimensions of 25 x 25 x 8 mm, a weight of 8 g, and a power consumption of 0.2 to 0.6 W. The entire arrangement as shown in 1 and 2 is shown, for example, can have an outer diameter of 55 mm and a height of 36 mm.

To protect them, the lines 61 are partially surrounded by a sheath 51 which is formed on the support frame 4.

The arrangement 1 is designed on its side C facing away from the printed circuit board 2 for bearing against a housing wall or the like. So that no rattling noises occur here, and to separate cold and warm air from one another, a sealing ring 7 is provided, which is arranged in an annular groove 71 in an end section 42 of the carrying frame 4.

Fig. 5 shows an oblique view from above of a not yet assembled support frame 4, in which the fan 3, the circuit board 6, the wire connection 61 and the sealing ring 7 are not shown.

The support member 45 is integrally formed on the support frame 4 via webs 45a. The support members 41a made of plastic together with the support frame 4 and the latching members 41b, which are provided with latching extensions 43 at their ends, are elastically flexible, so that they can snap behind edges or openings in or on the printed circuit board 2.

On the support frame 4 there is also an air flow guide member 5 for the targeted deflection of the fan

3 generated air flow provided.

The fan wheel 31 is located in Fig. 1 Above an annular air passage opening 47, the outer circumference 47a, often also referred to as "venturi", is formed by an annular element 40 of the support frame 4. The outer circumference 47a widens downward. The air flow guide member 5 is arranged below the air passage opening 47 in such a way that it deflects the air flow generated in a direction approximately parallel to the printed circuit board 2. The air flow guide member 5 is preferably formed in one piece with the support frame 4 and molded on below the support member 45.

To shape the air flow in the direction parallel to the printed circuit board 2, the air guide member 5 preferably has approximately the shape of a bell, which widens downward in the radial direction R. It can therefore also be referred to as an air bell 5.

The sheath 51 for the wire connections 61 is preferably designed as a protuberance from the air flow guide member 5. Fig. 2 shows this in a view obliquely from below onto the arrangement 1, specifically in a partial sectional view with a view of the wire connections 61 and the sheath 51. Fig. 4 shows an enlarged view of area II of Fig. 2 .

Fig. 3 shows a partially sectioned side view of the arrangement 1. In this representation, the arrangement 1 is mounted on a circuit board 2 by means of snap connections.

The support frame 4 with the molded air flow guide member 5 is in Fig. 5 shown obliquely from above, the fan 3, the circuit board 6, the wire connections 61 and the sealing ring 7 not being shown.

Fig. 6 shows a view of the support frame 4 from below, that is from the motor 33 printed circuit board side. In the middle you can see three holes 52, which are used to fasten the motor 33.

The arrangement 1 is preferably operated in such a way that cold air is drawn in from the outside and supplied to the components to be cooled. Alternatively, the fan 3 can also be operated in the opposite direction, so that it sucks in heated air from the printed circuit board 2 and blows it out.

Fig. 7 shows an exploded view of an arrangement 1 according to the invention. The circuit board 2 is shown below, which has recesses 23 for the ends 44 of the support members 41a and recesses 22 for the latching hook 43. The components on the circuit board are in Fig. 7 not shown.

The support frame 4 is shown above the printed circuit board 2, as is the sealing ring 7 assigned to it and the circuit board 6. The latter is electrically connected via its arm 64 to approximately vertically extending connecting lines 61.

The fan 3 with its fan blades 32 is located above the circuit board 6. It is fastened to the support member (flange) 45 of the support frame 4, preferably by a mechanical connection to the central projection 48 of the support member 45, which projection has a central recess in the assembled state 63 penetrates the board 6 and thereby centered.

Fig. 8 shows a preferred alternative to Fig. 3 . Here is the instead of the flat locking hook 41b Fig. 3 a locking foot 80 is provided with a cylindrical inner recess 81 running in the longitudinal direction of this locking foot and with a round double spring 82. This has two resilient legs 64, 66 and tapers at the lower end to form a cone 68, which facilitates insertion into a round hole 70 in the printed circuit board 2. The legs 64, 66 are formed by a longitudinal cut 72 in the lower end of the latching foot 80. This has an annular groove 74 on its outside, which fits into the recess 70 and can be positively locked with it by being pressed into it. Fig. 8 shows this locked position.

In this way, such a spring latching foot 80 enables assembly by latching in a precisely defined position, so that the support members 41a can be omitted.

The 9 to 23 show different variants of the air guide 5 of the 1 to 8 . If electronic components 21 are located under this air guide element, it may be necessary to also cool these components by means of part of the cooling air flow. The 9 to 23 each show an air guide member 5, the position of which on the support frame 4 from the 1 to 8 emerges and that through - preferably three - webs 45a ( Fig. 5 ) is connected to the ring 40 of the support frame 4. These webs 45a are shown in FIG 9 to 23 not shown.

The air guide 5 are, as in 1 to 8 , arranged on the carrier part (flange) 45 and are preferably in one piece with this. On the upper side of the carrier part 45 there are the inner raised edge 48 and the outer raised edge 49. The outer edge 49 usually has an interruption 49a as shown in FIG Fig. 5 is shown. In 9 to 23 this interruption is not shown, but can be provided there in the same way.

The outside of the air guide member 5 generally has an upper section 53 which runs essentially parallel to the axis of rotation A of the fan 3. The section 53 merges over a central section 54 into a lower section 55, which is rather perpendicular to the axis of rotation A. These sections are only in Fig. 9 shown and apply in the same way to the 10 to 23 .

In Fig. 9 the air guide 5 has a series of equidistant holes 60 with a circular cross section, which are located approximately at the transition from area 53 to area 54. An equal number of holes 62 are provided at the area 55, also with a circular cross section.

In this way, a relatively large amount of air can flow under the air guide member (5) and have a cooling effect there. Fig. 10 largely agrees Fig. 9 match, but only holes 60 are provided there and not holes 62.

It is the other way around Fig. 11 . Only holes 62 are provided there, but not holes 60. Both as in Fig. 10 as in Fig. 11 the main cooling air flow to the circuit board 2 is therefore increased.

In Fig. 12 twelve elongate recesses 64 are provided in the transition region 54, which, as shown, extend in the circumferential direction. Likewise, twelve elongated recesses 66 are provided in the region 55, which likewise extend in the circumferential direction and are offset relative to the recesses 64 in the manner shown.

In the variant after Fig. 13 only the recesses 64 are provided, and according to the variant Fig. 14 only the recesses 66. Consequently, at Fig. 12 the components 21 are best cooled below the air guide 5 Fig. 13 less strong, and at Fig. 14 the weakest. The question of which of the variants is used depends essentially on how much heat is generated in the area below the respective air guide member 5.

At Fig. 15 twelve elongated recesses 68 are provided in the transition region 54, which extend in the direction from top to bottom, and between these are located in the region 55, twelve elongate recesses 70, which likewise extend from top to bottom.

At Fig. 16 only the recesses 68 are present, and at Fig. 17 only the recesses 70. Here, too, the cooling effect applies to the components 21 below the air guide member 5 Fig. 15 best at Fig. 16 less good, and at Fig. 17 is worst.

Fig. 18 shows an air guide member 5, in which twelve recesses 72 with a rectangular cross section are machined in the transition region 54. Likewise, twelve recesses 74 with a rectangular cross-section are machined in the region 55, and these are offset from the recesses 72.

At Fig. 19 there are only the recesses 72, and at Fig. 20 only the recesses 74. The cooling effect therefore decreases Fig. 18 to Fig. 20 from.

At Fig. 21 12 recesses 76 with a rectangular cross section are provided in the transition region 54 of the air guide member 5, and in the region 55 twelve recesses 78, also with a rectangular cross section. At Fig. 22 only the recesses 76 are provided, and at Fig. 23 only the recesses 78. The mode of operation is practically the same as in the variants according to the 15, 16 and 17 , ie from the variant to Fig. 21 to the variant after Fig. 23 decreases the cooling effect for components 21 below the air guide 5.

Fig. 24 shows another embodiment of an arrangement 101 according to the invention. As in the previous embodiments, the same reference numerals are used for identical or identically acting parts, and these parts are not described again. When used, the arrangement 101 is mounted on a printed circuit board 2 which is shown in FIG Fig. 24 is indicated, and it is preferably used to create an in Fig. 24 not shown - to cool heat-sensitive component, which is directly under the arrangement 101 is attached to the circuit board 2. Fig. 1 shows such components 21.

The arrangement 101 has a support frame 104 which, as in the previous exemplary embodiments, is designed approximately in the manner of an oil rig. It has four support legs, namely two guide legs 105, 106 and two latching legs 107, 108. The latter are designed like the spring latching foot 80 of the Fig. 8 . Reference is therefore made to the description there in order to avoid lengths.

All support legs 105 to 108 have a support surface 105a, 106a, 107a, 108a, with which they are supported on the upper side of the printed circuit board 2 after assembly. The guide leg 105 has a guide pin 110 with the length d1, and likewise the guide leg 106 has a guide pin 111 with the same length d1 but a smaller diameter. In the case of the latching legs 107, 108, the latching sections 107b, 108b have a length d2 which is less than d1.

Accordingly, four holes are provided on the circuit board 2, of which in Fig. 24 only two are visible. A bore 112 serves to receive the guide pin 110, and a bore 113 serves to receive the locking leg 107 in the manner as in Fig. 8 has been described in detail for the locking leg 80.

A bore (not shown) is provided for the locking leg 108, the dimensions of which correspond to those of the bore 113, and a bore (not shown) is provided for the guide leg 106, the diameter of which is smaller than the diameter of the bore 112.

In this way, a correct and simple attachment of the arrangement 101 to the printed circuit board 2 is ensured, since the guide pins 110, 111 must first be inserted into the corresponding holes in the printed circuit board 2, which is only possible in a certain rotational position, and only then it is even possible to lock the latching section 107b in the bore 113 and the latching section 108b in the corresponding bore (not shown) since the distances d1 are greater than the distances d2.

A plug connector 114 is also mounted on the printed circuit board 2 and is used for the electrical connection of the printed circuit board 2 to three metal pins 41, via which the motor 33 of the fan 3 or its connection board 6 is electrically connected to corresponding conductor tracks the circuit board 2 is connected.

The four support legs 105 to 108 are hollow according to the invention and in their upper region merge into an essentially ring-shaped or tubular part 115, which merges into a flat edge 117 at the top, which runs perpendicular to the axis of rotation A and on its radially inner side is delimited by an upwardly projecting edge 119. A sealing ring 120 can be arranged on the edge 117 and serves to seal against a housing wall or the like. On its inside 121, the edge 119 is frustoconical. The truncated cone 121 merges into a cylindrical section 123, within which the blades 32 of the fan 3 rotate during operation.

At the lower end of the cylindrical section 123, a carrier part 127 is fastened via webs 125, and between this and the cylindrical section 123 there is an annular air passage opening 130, from which, during operation, a cooling air flow emerges downwards, which in FIG Fig. 25 is symbolically indicated at 132. (If necessary, the cooling air flow can also run in the opposite direction.)

How Fig. 25 shows, there is a groove-like recess 134 in the annular part 115, the flat edge 117 and the edge 119, the width b of which corresponds to the width of the arm 64 ( Fig. 7 ) the board 6 is adapted. This arm 64 widens at its free end to a hammer-like widening 64b, which in Fig. 25 is shown in section and whose width B is greater than the width b of the groove 134. This widening 64b is guided in a recess 136, which is complementary to it, in a box-like extension 138 of the support frame 104 and is there after assembly by two detent springs 140, 142 in held the way like that Fig. 25 shows so that the board 6 is securely held in the desired position after its assembly. This also ensures that the three metal pins 61, which are soldered to the circuit board 6, make contact with the contact member 114 during assembly and cannot be moved upward in the support frame 104.

After assembly, the motor 33 is permanently connected to the part 127, which has the shape of a saucer, in order to catch grease that could escape from the bearings of the motor 33 during operation and to avoid contamination of the printed circuit board 2.

Naturally, numerous modifications and modifications are possible within the scope of the present invention.

• Elemente 41, 43, 44; 80 zur Verbindung mit der Leiterplatte 2 und zur Abstützung an dieser,
• eine ringartige Luftdurchtrittsöffnung 47,
• und einen Klein- oder Kleinstlüfter 3, welcher an der von der Leiterplatte 2 abgewandten Seite C des Tragegestells 4 und im Abstand von der Leiterplatte befestigt und mit einem Lüfterrad 31 versehen ist, das sich im Betrieb um eine Drehachse A dreht und dabei Luft durch die ringförmige Luftdurchtrittsöffnung 47 transportiert,

wobei an dem Tragegestell 4 auf der der Leiterplatte 2 zugewandten Seite der Luftdurchtrittsöffnung 47 ein Luftleitelement 5 vorgesehen ist, das dazu dient, die Strömungsrichtung mindestens eines Teils der im Betrieb durch die Luftdurchtrittsöffnung 47 transportierten Luft umzulenken,
wobei bevorzugt das Luftleitelement 5 etwa nach Art einer Glocke ausgebildet ist, die sich vom Lüfter 3 weg in radialer Richtung R erweitert,
wobei bevorzugt das Tragegestell 4 radial innerhalb der Luftdurchtrittsöffnung 47 ein Abstützglied 45 aufweist, auf welchem der Lüfter 3 angeordnet ist,
wobei bevorzugt das Abstützglied 45 über Stege oder dgl. 45a mit einem radial außerhalb der Luftdurchtrittsöffnung 47 belegenen Teil 40 des Trägergestells 4 verbunden ist,
wobei bevorzugt das außerhalb der Luftdurchtrittsöffnung 47 belegene Teil 40 des Tragegestells 4 nach Art eines Rohrabschnitts ausgebildet ist,
wobei bevorzugt zum Antrieb des Lüfters 3 ein elektronisch kommutierter Motor 33 vorgesehen ist, welcher am Abstützglied 45 befestigt ist, und zwischen diesem Motor 33 und dem Abstützglied 45 eine Platine 6 angeordnet ist, welche zur Verbindung des Motors 33 mit elektrischen Anschlussleitungen 61 ausgebildet ist,
wobei bevorzugt die Platine 6 elektronische Bauelemente für die Kommutierung des zum Antrieb des Lüfterrads 31 dienenden Motors 33 aufweist, wobei bevorzugt die elektrischen Anschlussleitungen 62 im Tragegestell 4 geführt sind und auf ihrer Leiterplattenseite D zur elektrischen Kontaktierung mit der Leiterplatte 2 ausgebildet sind, wobei bevorzugt die Anschlussleitungen als Drahtverbindungen 61 ausgebildet sind, welche wenigstens teilweise von einer Umhüllung 51 umgeben sind, die von Teilen des Tragegestells 4 und/oder des Luftleitelements 5 gebildet sind,
wobei bevorzugt die Außenseite des Lüfterrades 31 zusammen mit der Innenseite 47a des nach Art eines Rohrabschnittes ausgebildeten Teiles 40 einen Ringraum 47 bildet, innerhalb dessen sich im Betrieb die Flügel 32 des Lüfterrades 31 drehen,
wobei bevorzugt sich der Querschnitt des Ringraumes 47 in Richtung zu dessen Auslass erweitert,
wobei bevorzugt das Tragegestell 4 auf seiner von der Leiterplatte abgewandten Seite eine Stirnfläche 42 aufweist, an der ein Dichtring 7 angeordnet ist,
wobei innerhalb der Stirnfläche 42 eine Vertiefung vorgesehen ist, innerhalb welcher der Lüfter 3 angeordnet ist,
wobei bevorzugt das Luftleitglied 5 mit Durchbrechungen 60, 62; 64, 66; 68, 70; 72, 74; 76, 78 versehen ist, um einen Teil des vom Lüfter 3 geförderten Luftstroms durch eine Wand des Luftleitglieds 5 hindurch zu leiten,
wobei bevorzugt der Lüfter 3 dazu ausgebildet ist, Luft, die von dem Luftleitelement 5 her kommt, durch die Luftdurchtrittsöffnung 47 zu transportieren,
wobei bevorzugt der Lüfter 3 dazu ausgebildet ist, Luft durch die Luftdurchtrittsöffnung 47 in einer Richtung zu transportieren, welche von der Luftdurchtrittsöffnung 47 zum Luftleitelement 5 geht, um an diesem die Luft in Richtung weg von der Drehachse A des Lüfters 3 umzulenken.The figures show an arrangement for cooling a printed circuit board 2 or the like. Which arrangement has: A support frame 4 which has

• Elements 41, 43, 44; 80 for connection to and for support on the printed circuit board 2,
• an annular air passage opening 47,
• and a small or very small fan 3, which is attached to the side C of the support frame 4 facing away from the printed circuit board 2 and at a distance from the printed circuit board and is provided with a fan wheel 31 which rotates in operation about an axis of rotation A and thereby air through the transported annular air passage opening 47,

an air guiding element 5 is provided on the support frame 4 on the side of the air passage opening 47 facing the printed circuit board 2, which serves to divert the direction of flow of at least some of the air transported through the air passage opening 47 during operation,
wherein the air guiding element 5 is preferably designed approximately in the manner of a bell, which widens away from the fan 3 in the radial direction R,
the support frame 4 preferably has a support member 45 radially inside the air passage opening 47, on which the fan 3 is arranged,
the support member 45 is preferably connected via webs or the like 45a to a part 40 of the carrier frame 4 which is radially outside the air passage opening 47,
the part 40 of the support frame 4 which is outside the air passage opening 47 is preferably designed in the manner of a tube section,
wherein preferably an electronically commutated motor 33 is provided for driving the fan 3, which is attached to the support member 45, and a circuit board 6 is arranged between this motor 33 and the support member 45, which is designed to connect the motor 33 to electrical connecting lines 61,
the circuit board 6 preferably has electronic components for the commutation of the motor 33 used to drive the fan wheel 31, the electrical connection lines 62 preferably being guided in the support frame 4 and being designed on their circuit board side D for electrical contacting with the circuit board 2, preferably the Connection lines are designed as wire connections 61, which are at least partially surrounded by a sheath 51, which is formed by parts of the support frame 4 and / or the air guide element 5,
the outside of the fan wheel 31 preferably forms an annular space 47 together with the inside 47a of the part 40 designed in the manner of a tube section whose blades 32 of fan wheel 31 rotate during operation,
the cross section of the annular space 47 preferably widens in the direction of its outlet,
the carrying frame 4 preferably has an end face 42 on its side facing away from the printed circuit board, on which a sealing ring 7 is arranged,
a recess is provided within the end face 42, within which the fan 3 is arranged,
wherein the air guide 5 preferably with openings 60, 62; 64, 66; 68, 70; 72, 74; 76, 78 is provided in order to direct part of the air flow conveyed by the fan 3 through a wall of the air guide member 5,
wherein the fan 3 is preferably designed to transport air coming from the air guide element 5 through the air passage opening 47,
wherein the fan 3 is preferably designed to transport air through the air passage opening 47 in a direction which goes from the air passage opening 47 to the air guide element 5, in order to divert the air there in the direction away from the axis of rotation A of the fan 3.

The figures also show a support frame for mounting a fan 3 at a distance from a printed circuit board 2, which support frame 4 has a support member 45 which is at a distance from the printed circuit board 2 in the assembled state and is designed as a support for a motor 33 of the fan 3, which support member 45 is surrounded by an air passage 47, which in turn is surrounded by an outer air guide member 14 which is connected to the support member 45 by at least one connecting member 45a, which connecting member 45a crosses the air passage 47, with mounting elements 41, 43, 44; 80, are provided for mounting the support frame 4 on the printed circuit board 2, and on the support member 45 on the side facing the printed circuit board 2, an air guide member 5 is provided,
wherein in particular the air guiding element 5 is designed approximately in the manner of a bell, the open side of which faces the printed circuit board 2,
wherein in particular the support member 45 is connected via webs 45a to a part 40 located radially outside the air passage opening 47,
wherein in particular the part 40 located outside the air passage opening 47 is designed in the manner of a pipe section,
an electronically commutated motor 33 in particular for driving the fan 3 is provided, which is designed for attachment to the support member 45,
in particular between this motor 32 and the support member 45 a circuit board 6 is arranged, which is designed to connect the motor 33 to electrical connecting lines 61,
the circuit board 6 in particular has electronic components for the commutation of the motor 33,
in particular the electrical connecting lines 62 are routed, which lines are formed on their circuit board side D for electrical contacting with the circuit board 2,
in particular the connecting lines are designed as wire connections 61 which are at least partially surrounded by a sheath 51 which is formed by parts of the support frame 4 and / or the air guiding element 5,
in particular the outside of the fan wheel 31 together with the inside 47a of the part 40 designed in the manner of a tube section forms an annular space 47 within which the blades 32 of the fan wheel 31 rotate during operation,
in particular, the cross section of the annular space 47 widens in the area of at least one end section,
wherein in particular the carrying frame has an end face 42 on its side facing away from the printed circuit board 2, on which a sealing ring 7 is arranged,
a recess for receiving a fan 3 is provided in particular within the end face 42,
wherein in particular the air guide 5 is provided with at least one opening 60, 61, 61, 64, 66, 68, 70, 72, 74, 76, 78.

Claims (10)

1. A support frame for installation on a circuit board (2), which support frame is configured in the manner of a drilling rig and comprises a platform (117) that is equipped with supporting legs (105, 106, 107, 108) for mounting on the circuit board (2), which support frame has, at the center of the platform (117), a depression (121, 123; 40, 47a) that is configured for installation of a fan (3) that has an air passthrough opening (130, 47), wherein in the installed state, the air passthrough opening (130, 47) is at a distance from the circuit board (2), characterized in that when the fan is in the installed state, the outer wall (123; 47a) of the depression (121,123; 40, 47a) forms a part of the air passthrough opening (130, 47) of the fan and the supporting legs (105 to 108) are configured as at least partially hollow.
2. The support frame according to claim 1, in which the supporting legs (105 to 108) are configured as integral with the platform (117).
3. The support frame according to either of claims 1 to 2, in which at least one supporting leg (107, 108) is equipped with a latching element (107b, 108b) for latching into an associated recess (113) in the circuit board (2).
4. The support frame according to any one of claims 1 to 3, in which at least one supporting leg (105, 106) is provided that has no latching element and that is longer than a supporting leg (107, 108) that is equipped with a latching element (107b, 108b).
5. The support frame according to any one of claims 1 to 4, in which at least one supporting leg (105, 106) is provided that has no latching element and that has, at its free end, a portion (110, 111), the diameter of which is complementary to the diameter of a predetermined recess (112) in the circuit board (2), which recess is associated with that supporting leg in the installed state.
6. The support frame according to any one of the preceding claims, on which electrically conductive elements (61) are provided, which are configured to form, upon installation of the support frame on a circuit board (2), an electrical connection to a counter element (114) provided on the circuit board.
7. The support frame according to claim 6, in which the electrically conductive elements are configured in the manner of pins (61).
8. The support frame according to claim 6 or 7, in which the electrically conductive elements (61) are electrically connected to a circuit plate (6), which is configured to supply electrical energy to a fan (3) arranged on the support frame (104).
9. The support frame according to claim 8, on which the circuit plate (6) is immobilized in a predetermined position in the installed state.
10. The support frame according to claim 9, in which for immobilizing the circuit plate (6), at least one latching spring (140, 142) is provided, which latches the circuit plate (6) in a predetermined position.

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