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Title:
FAN WITH A HEAT DISSIPATION DEVICE ASSOCIATED WITH THE CONTROLLER BOARD THEREOF
Document Type and Number:
WIPO Patent Application WO/2019/201802
Kind Code:
A1
Abstract:
There is described a fan comprising a frame (2) for receiving an impeller (3) which is provided with blades (4a), a pressure chamber (7) of the fan which is delimited between the frame (2) and the blades (4a), an electronic board (8) for controlling the fan which is externally associated with the frame (2), a heat dissipation device which is associated with the electronic board, wherein the heat dissipation device comprises at least one heat dissipating element (10) of thermally conductive material which extends from the electronic board (8), through a first through-opening (11) which is provided in the frame (2), as far as the interior of the pressure chamber (7) of the fan so that at least a portion of the dissipating element(10) is acted on by the air flow generated by the impeller (3) of the fan.

Inventors:
DE MARCO, Fabio (Via Ragazzi del '99, Padova, 35129, IT)
Application Number:
EP2019/059539
Publication Date:
October 24, 2019
Filing Date:
April 12, 2019
Export Citation:
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Assignee:
SIT S.P.A. (Viale dell'Industria, 31/33, PADOVA, I-35129, IT)
International Classes:
F04D29/42; F04D25/08; F04D29/58; F04D29/62
Domestic Patent References:
WO2017211093A12017-12-14
Foreign References:
US20120034077A12012-02-09
US20040241005A12004-12-02
Other References:
None
Attorney, Agent or Firm:
FABRIS, Stefano et al. (CANTALUPPI & PARTNERS S.r.l, Piazzetta Cappellato Pedrocchi 18, Padova, 35122, IT)
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Claims:
CLAIMS

1. A fan comprising :

- a frame (2) for receiving an impeller (3) which is provided with blades (4a),

- a pressure chamber (7) of the fan which is delimited between the frame (2) and the blades (4a),

- an electronic controller board (8) of the fan which is externally associated with the frame (2),

- a heat dissipation device which is associated with the electronic board, characterized in that the heat dissipation device comprises at least one heat dissipating element (10) of thermally conductive material which extends from the electronic board (8), through a first through-opening (11) which is provided in the frame (2), as far as the interior of the pressure chamber (7) of the fan so that at least a portion of the dissipating element (10) is acted on by the air flow generated by the impeller (3) of the fan.

2. A fan according to claim 1, wherein the at least one dissipating element (10) has a laminar formation with a main longitudinal extent which extends from a first end (10a) thereof for connection to the board (8) in the direction of an opposite second axial end (10b) which is capable of positioning inside the pressure chamber (7) of the fan.

3. A fan according to claim 1 or 2, wherein the at least one dissipating element (10) is capable of being connected by means of welding to the dissipating portion constructed on the board (8) of components which require heat dissipation.

4. A fan according to any one of the preceding claims, wherein the electronic controller board (8) is received in a protection box (9) which is capable of being mounted on the frame (2) in such a position that the at least one dissipating element (10) can extend through a second through- opening (12) which is provided in the box (9) in a position corresponding to the through-opening (11) in the frame as far as the interior of the pressure chamber (7).

5. A fan according to any one of the preceding claims, wherein there are provided a pair of the dissipating elements (10) produced from a thermally conductive material, both extending through a pair of respective second through-openings (12) which are formed in the box (9) in order to reach the pressure chamber (7) through a corresponding pair of through-openings (11) which are provided in the frame (2).

6. A fan according to any one of the preceding claims, wherein the at least one dissipating element (10) is produced from metal material.

Description:
Fan with a heat dissipation device associated with the controller board thereof

Technical field

The present invention relates to a fan with a heat dissipation device having the features set out in the preamble of main claim 1.

Technological background

The invention relates particularly though not exclusively to the technical field of centrifugal fans which are configured for applications in pieces of heating equipment and which are controlled electronically. It can also be used in extractor hoods and smoke extractors as well as in some other applications in which there is provided a fan with a relevant controller board. In this field, the fans of the type mentioned above are typically constructed as centrifugal fans having a helical frame which is suitable for receiving an impeller which carries the blades of the fan. The frames of these fans are further provided with a lateral intake opening and a tangential delivery opening, between which there extends the pressure chamber with a helical extent, the volume of which is defined between the frame and the impeller. The fan is operatively controlled by means of an electronic board which is typically, for reasons of convenience and compactness in terms of overall dimensions, positioned near the frame of the fan. It is known, for example, to receive the board in a protection box which is applied externally to the frame of the fan.

Furthermore, for requirements involving the protection of the board from dust or liquids or contaminants in general, the board is normally received and closed in a protected compartment. However, the use of boxes or protected compartments for the controller boards of the fan makes it difficult to dissipate the heat which is in particular developed by the power control portion of the electronic board, both as a result of the magnitude of the heat which is intended to be discharged and as a result of the restricted spaces in which this portion is confined.

In order to attempt to overcome these problems, the solutions currently known provide for the use of radiant elements which often have great dimensions, for example, which are constructed in the form of cooling fins. Additionally or alternatively, there may be provision for the radiant element to be integrated in the frame of the fan, which is normally produced from plastics material, in order to be exposed to the air flow. Limitations of such a solution are connected with the fact that normally there has to be developed a cooling fin which is suitable for being integrated with the shapes of the fan, with the resultant complications of expansion of the materials and the high costs for the formation of the plastics components of the frame and the cooling fin.

Description of the invention

A main object of the invention is to provide a fan with a heat dissipation device of the above-mentioned type which is structurally and functionally configured to overcome the limitations set out with reference to the known solutions cited.

This object and other objects which will be set out below are achieved by the invention by means of a fan with a heat dissipation device which is constructed according to the appended claims. Brief description of the drawings

Other features and advantages of the invention will be better appreciated from the following detailed description of a preferred embodiment thereof which is illustrated by way of non-limiting example with reference to the appended drawings, in which :

- Figure 1 is a side view of a fan which is constructed according to the invention,

- Figure 2 is a perspective view of an example of an electronic controller board with a heat dissipation device which is configured for the fan of Figure 1,

- Figure 3 is a partial view of the fan and the controller board of the preceding Figures.

Preferred embodiment of the invention

With reference to the cited Figures, there is designated 1 a centrifugal fan for extractor hoods which is constructed according to the present invention. The fan 1 comprises a frame 2 with an internal profile which is substantially helical and which can be, for example, constructed in two frame portions which can be connected to each other in a removable manner.

There is received in the frame 2 an impeller 3 which is provided with a drum 4 which carries blades 4a with blades having an axial extent, the impeller being capable of being rotated about an axis X. There are further defined in the frame a tangential delivery opening 5 which is directed tangentially with respect to the impeller and a pair of lateral intake openings 6, which are coaxial with respect to the axis X and which are each formed on the respective frame portion. There is designated 7 (though only partially illustrated) a pressure chamber which is defined inside the frame 2, over the helical extent thereof, the volume of which is delimited between the drum of the blades and the internal surface profile of the frame itself.

There is designated 8 an electronic controller board of the fan in which there is provided the circuit arrangement and the relevant components which are suitable for performing the instruction and operational control functions of the fan.

The electronic board 8 is advantageously received in a protection box 9 which comprises a box-shaped casing 9a for supporting the board, to which a closure cover 9b can be connected in a removable manner.

The box-shaped casing 9a is configured to be mounted in a removable manner, for example, by screw means, on the frame 2 of the fan. In the example described here, there is provision for the casing to be applied to the external surface of the frame near the delivery zone of the fan, at the side of the helical profile corresponding to the minimum cross-sections of the pressure chamber.

The fan 1 further comprises a heat dissipation device which is associated with the electronic board 8 and which is provided to dissipate the heat generated by the components of the circuit arrangement of the board.

According to a main feature of the invention, the heat dissipation device mentioned above comprises at least one heat dissipating element 10 of a thermally conductive material. In the preferred example described here, there are provided a pair of dissipating elements 10 which are arranged in a spaced-apart relationship relative to each other. It will be understood that the number (one or more) of the dissipating elements 10 is selected in accordance with the quantity of heat which is intended to be dissipated in order to ensure the correct operative function thereof. The heat to be dissipated is generated during the operation of the electronic board and in particular by the power control portion of the board itself.

A single one of the dissipating elements 10 will be described in detail below as a result of the structural identity thereof.

Each dissipating element 10 extends from the board 8, in particular it projects transversely from the base 8a of the board which carries the tracks of the printed circuit, in order to extend, through a through-hole 11 which is provided in the frame 2, as far as the interior of the pressure chamber 7 of the fan so that at least a portion of the dissipating element 10 is acted on by the air flow generated by the impeller of the fan.

There is further designated 12 a respective opening which is formed as a through-opening through the thickness of a base wall 9c of the protection box 9, which is arranged in a position corresponding to the through-opening 11 of the frame. With such a configuration, each dissipating element 10 can extend from the board 8 as far as the interior of the pressure chamber, extending through the respective openings 11 and 12.

The openings, inside which the dissipating element extends, are configured so as to prevent external contaminants which are present in the air which flows inside the fan from being able to enter the protection box 9 and generates malfunctions of the board.

Since the element 10 is partially positioned in the air flow generated by the impeller, the transmission of heat, in particular by convection, promotes the dissipation of the heat which is discharged by the board to the dissipating element and which is directed through the element inside the pressure chamber.

According to an embodiment of the invention, the dissipating element 10 is connected to the board 8 with a non-removable connection, preferably by means of welding.

With particular reference to Figure 3, each dissipating element 10 has a laminar formation with a main longitudinal extent which extends from a first end 10a thereof for connection to the board 8 in the direction of an opposite second axial end 10b which is capable of positioning inside the pressure chamber 7 of the fan. The first end 10a of the dissipating element is connected, advantageously by means of soldering, to the dissipating portion which is constructed on the electronic board of the components, usually for transferring power, which require dissipation of the heat.

For greater efficiency during transmission of the heat, each dissipating element 10 is produced from metal material.

It may be observed how the solution proposed by the invention advantageously involves the use of simple and common components, such as the "faston" terminals, the geometrical shape of which follows the opening which would be created in the casing of the pressure chamber.

The invention thereby achieves the objectives proposed, achieving the advantages set out with respect to the known solutions.

A main advantage is that the heat dissipation device according to the invention solves the problem relating to the dissipation of the heat generated by the electronic controller board of the fan by using dissipating elements involving a simplified structure and a low cost, without having to use geometries of delicate and complex formation, at the same time ensuring a suitable efficiency of heat exchange.