CN106550586B

CN106550586B - Heat radiator

Info

Publication number: CN106550586B
Application number: CN201610922540.4A
Authority: CN
Inventors: S·普拉亚米罗; A·里克雷布尔; C·巴蒂斯特马亚斯
Original assignee: Simon SA
Current assignee: Simon SA
Priority date: 2015-09-18
Filing date: 2016-09-19
Publication date: 2021-02-12
Anticipated expiration: 2036-09-19
Also published as: CN106550586A; CN106550586A8

Abstract

A heat sink comprises a central body (2), and a first fin (3a) and a second fin (3b) extending from the central body (2) and distributed around an axis (Z) of the central body (2) for dissipating heat generated by an electrical component (100). The first fins (3a) and the second fins (3b) are arranged in an alternating manner, adjacent fins (3a,3b) being inclined with respect to a first plane (V) parallel to the axis (Z).

Description

Heat radiator

Technical Field

The present invention relates to a heat sink for conventional electrical or electronic devices, in particular for lamps with Light Emitting Diodes (LEDs).

Background

The heat sink is used to prevent the device from overheating and to conduct heat generated by the electrical or electronic components integrated or connected to the device to the atmosphere. The larger the surface area of the heat sink in contact with the air, the greater the amount of heat transferred to the air and thus the better the cooling effect of the device. Other factors that affect the heat dissipation efficiency of a heat sink are the flow rate of air, the design structure, the materials used, the surface treatment performed, the manner in which the electrical or electronic device is connected to the heat sink, and so forth.

One of the most common design features in the manufacture of heat sinks is the placement of fins around an axis. Heat sinks of this type typically have a central body for absorbing heat dissipated by one or more electrical or electronic components, and a plurality of fins extending from the body and radially distributed about an axis to dissipate the heat absorbed by the body into the air. To enhance the heat absorption of the core and the heat transfer to the fins, materials with high thermal conductivity are often used, such as aluminum or copper, among others.

These heat sinks usually have geometrically uniform fins distributed around the central body in given positions equal to each other. To facilitate the fabrication of the heat sink using an extrusion process, the heat sink must have a fixed cross-section along the extrusion axis. For this reason, the walls constituting the fins are arranged parallel to each other, and there is no inclination between any adjacent fins. In other words, all the fins are parallel to each other along the extrusion axis, the air flow channels defined between the fins having a constant cross section.

Generally, the extrusion process requires large machinery and high maintenance costs, which can be slow when high impact forces are required to pass the material through the die, leave impurities and defects on the surface of the extruded material, and severely limit the geometry of the component since it must have a constant cross-section along the extrusion axis.

On the other hand, manufacturing processes using injection molding are more flexible in terms of the variety of shapes and geometries that can be obtained, and they are generally faster to produce, less costly (depending on the complexity of the component), and generally more finished on the surface of the component that can be obtained.

Currently, it is quite difficult to manufacture the heat sink using an injection molding process. The main difficulty is the parallel arrangement of the fins, which are generally all perpendicular to the axis around which they are distributed. Therefore, there is no bevel that facilitates demolding of the heat sink after injection molding is completed. Sometimes, the fin thickness is set to vary non-uniformly for demolding. This results in a reduction in the heat dissipation efficiency of the heat sink and an increase in consumption of raw materials required for manufacturing.

Disclosure of Invention

The configuration of the radiator of the invention is particularly designed to allow it to be manufactured using an injection moulding process, since the first fins and the second fins are arranged in an alternating manner, with adjacent (preferably opposite) fins being inclined with respect to a vertical plane parallel to the axis about which the fins are distributed. Thus, the heat sink is configured with the inclined fins of constant thickness, greatly facilitating demolding after injection molding. The resulting heat sink exhibits a strong function and high efficiency in dissipating heat from the electrical or electronic component in question.

The heat sink of the present invention comprises:

a central body; and

first and second fins extending from the central body and distributed around the axis of the central body for dissipating heat generated by electrical components (lamps, computer boards, electronic devices, etc., or parts thereof: LEDs, CPUs, etc.).

The heat sink according to the invention is characterized in that the first fins and the second fins are arranged in an alternating manner, adjacent fins being inclined with respect to a first plane parallel to the axis of the central body. As previously mentioned, the fins are angled to facilitate demolding of the heat sink after the injection molding process.

Preferably, the first and second fins are inclined in opposite directions relative to the first plane.

Preferably, the first and second fins having a constant or uniform thickness are provided with inclined fins, which can enhance heat dissipation of the heat sink and improve efficiency. The constant thickness allows for a deviation of + -10% of its thickness that may be the result of roughness or other manufacturing defects.

The first and second fins have a first inclination angle formed between the adjacent fins with respect to the first plane in a range of 1 DEG to alpha_VLess than or equal to 180 degrees. Preferably, a first inclination angle (α) between adjacent fins (3a,3b) with respect to the first plane (V)_V) Alpha is within the range of 1 degree to less than or equal to alpha_V≤45°。

The first and second fins can be joined together to form a completely continuous profile around the heat sink, or they can be separated individually to form a completely discontinuous profile around the heat sink. They can also be partially connected, forming groups of fins separate from other groups of fins.

Preferably, the heat sink includes air flow channels defined between adjacent fins. Due to the inclination of the fins, the air flow channels have a varying cross section, so that the air flow velocity between the fins varies, thereby enhancing the heat transfer.

Preferably, at least one first fin is longitudinally connected to an adjacent second fin at a connecting edge. If all the fins of the heat sink repeat this connection, the heat sink will be formed of a plurality of groups of twin fins spaced from each other by air flow channels, each group including a first fin and a second fin.

In particular, the connecting edges act as stressed areas when the demolding tool pushes the heat sink to demold it, which is not possible when the fins are parallel or non-inclined. As previously mentioned, two different methods may be used, either thickening the fins or providing different thickness variations at the location where the demolding tool is applied. Both of which result in a decrease in heat transfer efficiency and an increase in the material used for the fins.

Preferably, a transverse section parallel to the axis of the central body and in V-shape is formed between adjacent fins.

Preferably, a longitudinal section perpendicular to the axis of the central body and having a V-shape is formed between adjacent fins.

In order to supply electrical or electronic components, the heat sink comprises terminal blocks, preferably arranged between the fins. To this end, the heat sink includes first and second fins disposed between the central body and the terminal block.

The central body can have various configurations depending on the geometry of the heat sink, wherein the central body preferably comprises an inner hollow space for accommodating an electrical element or part of an electrical element.

Drawings

The following is a brief description of a series of drawings to help better understand the present invention, which are described as non-limiting examples in connection with embodiments of the present invention.

Fig. 1 is an exploded perspective view of a first embodiment of an electrical component with a lamp mounted internally, including a heat sink according to the present invention.

Fig. 2 is a front view of the heat sink shown in fig. 1.

Fig. 3 is a view of the heat sink shown in fig. 1.

Fig. 4 is a cross-sectional view of the heat sink according to section line a-a in fig. 3.

Fig. 5 is a perspective view of the heat sink shown in fig. 1.

Fig. 6 is a perspective view of a heat sink according to a second embodiment of the present invention.

Fig. 7 is a top view of the heat sink shown in fig. 6.

Detailed Description

Fig. 1 is an exploded perspective view of an electrical component (100), in this case a lamp built-in mount, comprising a heat sink (1) according to the invention.

As shown, the heat sink (1) comprises:

a central body (2); and

first fins (3a) and second fins (3b) extending from the central body (2) and distributed around the axis (Z) of the central body (2) to dissipate heat generated by the electrical element (100).

As shown in fig. 2, the heat sink (1) is characterized in that the first fins (3a) and the second fins (3b) are arranged in an alternating manner, adjacent fins (3a,3b) being inclined in opposite directions with respect to a first plane (V) parallel to the axis (Z), forming a triangular profile. The first plane (V) is a vertical plane. According to this embodiment, the fins (3a,3b) are arranged radially around the axis (Z) while coinciding with the axis or central axis of the central body (2).

The first fin (3a) and the second fin (3b) have a first inclination angle (alpha) with respect to a first plane (V) formed between adjacent fins (3a,3b)_V) Alpha is within the range of 1 degree to less than or equal to_V45, and in the present embodiment, about 30.

The heat sink (1) comprises air flow channels (4) defined between adjacent fins (3a,3 b). Any one of these air flow channels (4) has a transverse cross section between adjacent fins (3a,3b) that varies between a wide zone (41) and a narrow zone (42) so that the air flow velocity varies.

The first fins (3a) are longitudinally connected to adjacent second fins (3b) at connecting edges (31) to form a plurality of twin fins (3a,3b) mutually separated from each other by air flow channels (4), each twin fin (3a,3b) comprising one first fin (3a) and one second fin (3 b). These connecting edges (31) are able to withstand the thrust of the tool so that the heat sink (1) can be demoulded after the injection moulding process. In this manner, any markings or indicia resulting from the demolding process are left in the unobtrusive areas.

As shown, a transverse section parallel to the axis (Z) and V-shaped is formed between adjacent fins (3a,3 b).

As shown in fig. 3, the first fin (3a) and the second fin (3b) are also inclined in opposite directions between adjacent fins (3a,3b) with respect to a second plane (H) perpendicular to the axis (Z). The second plane (H) is a horizontal plane.

The first fin (3a) and the second fin (3b) have a second inclination angle (alpha) formed therebetween with respect to the second plane (H)_H) Depending on, for example, the number of fins (3a,3b), the size of the heat sink (1), the first inclination angle (alpha)_V) The value of (a) and the like. According to the present embodiment, the second inclination angle (α)_H) Is about 15.

As shown, a longitudinal section perpendicular to the axis (Z) and having a V-shape is formed between adjacent fins (3a,3 b).

In order to supply electrical power to an electrical or electronic component (100), the heat sink (1) comprises a terminal block (5). The heat sink (1) comprises first (3a) and second (3b) fins arranged between the central body (2) and the terminal block (5) to avoid loss of surface area for heat transfer.

The terminal block (5) is arranged on a support (51) defined by two side walls (52), the side walls (52) extending from the central body (2) and being arranged radially around an axis (Z), between the two side walls (52) there being a first fin (3a) and a second fin (3 b).

Fig. 4 and 5 are a cross-sectional view and a perspective view, respectively, of the heat sink (1), more clearly showing the geometry of the heat sink (1). As shown, the central body (2) comprises an inner hollow space (21) for accommodating an electrical component (100) or part thereof, in this embodiment a light emitting plate of a lamp.

Fig. 6 and 7 are a perspective view and a view, respectively, of a heat sink in a second embodiment of the present invention.

As shown in the figure, the heat sink (1) is placed in the cylindrical housing (6) in this embodiment, taking advantage of the larger heat transfer surface area of the cylindrical housing (6), collecting part of the heat of the fins (3a,3b) and dissipating it into the air. As in the previous embodiment, the first fins (3a) and the second fins (3b) extend from the central body (2) and are distributed around the axis (Z) to dissipate the heat generated by the electrical component (100) (not shown in the figures). Thus, in this exemplary embodiment, the fins (3a,3b) resemble connecting ribs connected to another heat transfer element to constitute a heat conducting bridging member to promote heat dissipation.

Similarly, the first fins (3a) and the second fins (3b) are arranged in an alternating manner, the adjacent fins (3a,3b) being inclined with respect to a first plane (V) parallel to the axis (Z), so that the heat sink can be demoulded after the injection-moulding manufacturing process is completed.

Claims

1. A heat sink, comprising:

a central body (2); and

a first fin (3a) and a second fin (3b) extending from the central body (2) and distributed around the axis (Z) to dissipate heat generated by the electrical component (100);

wherein the first fins (3a) and the second fins (3b) are arranged in an alternating manner, adjacent first fins (3a) and second fins (3b) forming an inclination angle (α) between them with respect to a first plane (V) parallel to the axis (Z)_V) The heat sink (1) is characterized in that it further comprises an air circulation channel (4) defined between adjacent first (3a) and second (3b) fins, the air circulation channel having a cross section between the adjacent first (3a) and second (3b) fins that varies between a wide zone (41) and a narrow zone (42) in the direction of the axis (Z), wherein the first (3a) and second (3b) fins are inclined in opposite directions with respect to the first plane (V).

2. Heat sink according to claim 1, characterised in that the angle of inclination (α) formed between adjacent first (3a) and second (3b) fins with respect to a first plane (V)_V) Alpha is within the range of 1 DEG to less than or equal to_V≤45°。

3. A heat sink according to claim 1, characterised in that at least one first fin (3a) is longitudinally connected to an adjacent second fin (3b) at a connecting edge (31).

4. A heat sink according to claim 1, characterised in that a transverse section parallel to the axis (Z) and V-shaped is formed between adjacent first fins (3a) and second fins (3 b).

5. A heat sink according to claim 1, characterised in that a longitudinal section perpendicular to the axis (Z) and having a V-shape is formed between adjacent first fins (3a) and second fins (3 b).

6. A heat sink according to claim 1, further comprising a terminal block (5) disposed between the first fin (3a) and the second fin (3b) to supply power to the electric or electronic component.

7. Heat sink according to claim 6, characterised in that it further comprises first (3a) and second (3b) fins arranged between the central body (2) and the terminal block (5).

8. A radiator as claimed in claim 1, characterized in that the central body (2) comprises an internal hollow space (21) configured to house the electrical element (100).

9. A heat sink according to claim 1, characterised in that the first fin (3a) and the second fin (3b) have a constant thickness.