Radiator, lighting and / or signal indicator device for LED headlight and motor vehicle

Abstract

The present disclosure provides a heat sink for an LED headlight, a lighting and / or signaling device, and a motor vehicle. Specifically, the heat sink for an LED headlight provided in embodiments of the present disclosure includes: a substrate; and a plurality of fins extending perpendicularly or obliquely from the substrate and spaced apart from one another. Each of the fins is configured to converge toward a proximal end and a distal end along its respective length, and the substrate and adjacent fins of the plurality of fins collectively define a fluid channel therebetween.

Description

Technical Field

[0001] The invention relates to a radiator for an LED headlamp, a lighting and / or signal indicating device and a motor vehicle. Background Art

[0002] Lighting and / or signaling devices, particularly lamps, are indispensable components of motor vehicles and are also important tools for ensuring the normal and safe operation of motor vehicles. Currently, motor vehicles are generally designed with lamps, such as at least a pair of headlights and a pair of taillights. Lamps, particularly headlight assemblies, were previously based on incandescent lamp technology (such as halogen bulbs as light sources). With technological advancements, headlights are currently also based on, for example, light-emitting diodes ("LEDs") with lower power consumption and longer continuous operation times, and on higher-power laser technology (such as semiconductor laser devices as light sources). The light source is placed in a housing having a cover, and the light generated by the light source is radiated outwardly through the guidance of the cover.

[0003] LED light sources are widely used in automotive headlights and taillights due to their many advantages, including high brightness, low energy consumption, flexible design, fast response, and increased safety. However, the performance and lifespan of LED light sources are significantly affected by their operating temperature, necessitating a robust heat dissipation system to ensure proper operation.

[0004] In actual applications, since these lamps usually generate heat when working, in order to prevent heat from accumulating in the relatively small space inside the lamp housing and affecting the normal operation of the light source, it is usually necessary to set a heat sink in the lamp housing, especially on the substrate of the light source, and additionally set a fan for guiding air flow through the heat sink to facilitate the dissipation of the heat generated in the lamp housing. Traditional heat sinks are made of metal and absorb the heat generated by the LED light source by contacting the surface of the LED heating component. The heat is dissipated into the air by conduction and convection to ensure that the temperature of the LED component is normal. In order to enhance heat dissipation, a fan can be added to force convection heat dissipation on the radiator. The fan generates an air flow with a certain flow rate. When it flows through the fins of the radiator, it can quickly remove heat through convection heat exchange, reduce the temperature of the radiator, and thus ensure the normal operation of the LED.

[0005] However, the fins of the existing radiator for guiding the wind generated by the fan have a relatively large wind blocking effect, resulting in uneven air flow rate and mutual disturbance of airflow, thereby resulting in unsatisfactory heat dissipation effect. Summary of the Invention

[0006] In order to solve at least one aspect of the above-mentioned problems and defects in the prior art, an object of the present invention is to provide a radiator for an LED headlamp, a lighting and / or signal indicating device, and a motor vehicle.

[0007] In order to achieve the above object, the technical solution of the present invention is implemented in the following ways:

[0008] According to a first aspect of the present invention, a heat sink for an LED headlamp is provided, comprising: a substrate configured to be plate-shaped; and a plurality of fins configured to extend vertically or obliquely from the substrate and to be spaced apart from each other, wherein each of the plurality of fins is configured to contract toward a proximal end and a distal end in a respective length direction, and the substrate and adjacent fins of the plurality of fins jointly define a fluid channel therebetween.

[0009] With this arrangement, the orthographic projection of each fin on a plane parallel to the base plate gradually contracts toward its ends at least along its length, thereby forming a fluid channel between adjacent fins that first contracts and then expands. According to Bernoulli's principle, this helps reduce the flow resistance of the fluid channel between adjacent fins, facilitating smoother fluid entry into the channel and accelerating the fluid through a narrowing initial channel section, thereby increasing the efficiency of heat removal from the heat sink base plate. The fluid then passes through a widening subsequent channel section to control the increase in fluid velocity, thereby avoiding excessive acceleration of the fluid to form a jet-like outflow and backflow caused by impact at the fluid channel outlet. It also avoids the formation of vortices at the fluid channel outlet due to boundary layer separation, thereby ensuring smooth fluid outflow while ensuring heat dissipation. This arrangement achieves reduced flow resistance and an appropriate increase in flow velocity, thereby facilitating the elimination of condensation.

[0010] In an embodiment according to the present invention, each of the plurality of fins has side surfaces arranged opposite each other in a direction transverse to their respective length directions. The projection of each side surface onto a plane parallel to the base plate is a smooth curve or straight line, and the tangent direction at each point on the side surface is set to: be substantially the same as the direction of the fluid flowing through the point; or to form an angle with the direction of the fluid flowing through the point that is less than a threshold angle. This results in a smooth fin surface, so that the direction of fluid flow on the fin surface is approximately the same as or close to the direction of the surface contour, thereby reducing flow damping and facilitating uniform laminar flow of air between adjacent fins.

[0011] In an embodiment of the present invention, each of the plurality of fins typically has a spindle-shaped, elliptical, shuttle-shaped, or diamond-shaped cross-section on a plane parallel to the base plate. These specific cross-sectional forms can all achieve a cross-section that narrows toward both ends along the length direction.

[0012] In an embodiment of the present invention, the lengthwise directions of the plurality of fins are parallel. Preferably, the plurality of fins are equally spaced apart in a direction transverse to their respective lengthwise directions. This allows for substantially parallel airflows to flow out of the fluid channels defined by adjacent fins, thereby reducing turbulence between the airflows.

[0013] In an embodiment of the present invention, each of the plurality of fins is configured to have the same three-dimensional shape. This typical size and shape facilitates smooth acceleration of the fluid when it passes through the fluid channel between adjacent fins.

[0014] In an embodiment according to the present invention, the surface of the portion of the substrate located between adjacent fins among the plurality of fins is configured to be uneven. Preferably, the surface of the portion of the substrate located between adjacent fins among the plurality of fins is configured to be corrugated. In another preferred embodiment according to the present invention, the portion of the substrate located between adjacent fins among the plurality of fins is provided with a plurality of holes. These arrangements facilitate increasing the contact area between the airflow and the substrate when flowing through the fluid channel between adjacent fins, thereby facilitating enhanced heat exchange between the airflow and the substrate, thereby improving heat dissipation efficiency.

[0015] In another embodiment of the present invention, the cross-section of each of the plurality of fins is configured to taper outward along the normal direction of the substrate. This configuration causes the flow cross-section of the fluid channel to narrow as it approaches the substrate in the height direction of the fin, thereby increasing the fluid flow rate at that location, accelerating direct heat exchange with the substrate, and improving heat dissipation efficiency.

[0016] In an embodiment of the present invention, the heat sink for LED headlights further comprises: at least one first protrusion disposed on the substrate and located between adjacent fins among the plurality of fins, and arranged adjacent to the distal ends of the respective adjacent fins in the longitudinal direction. In a further embodiment, each of the first protrusions is configured to have a width in the lateral direction of the longitudinal direction of the respective adjacent fins that gradually increases toward the distal end. By providing such a first protrusion, the inlet of the fluid channel between the adjacent fins, which has a wider flow cross-section, disturbs the airflow, allowing the fluid at the inlet to more fully contact the substrate and fins, thereby enhancing heat exchange; at the same time, due to the wider flow cross-section at the inlet, the airflow is not excessively obstructed.

[0017] In an embodiment according to the present invention, the heat sink for the LED headlamp further comprises: at least one second protrusion provided on the substrate and located between adjacent fins among the plurality of fins and arranged adjacent to the proximal ends of the adjacent fins in the length direction.

[0018] Preferably, a minimum value of a distance between each of the second protrusions and the adjacent fins is greater than a maximum value of a distance between each of the first protrusions and the adjacent fins.

[0019] Preferably, a distance between each of the first protrusions and an edge at a distal end of the base plate is greater than a distance between each of the second protrusions and an edge at a proximal end of the base plate.

[0020] Preferably, a height of each of the first protrusions in the normal direction of the substrate is greater than a height of each of the second protrusions in the normal direction of the substrate.

[0021] The arrangement of the first and / or second protrusions results in further channel subdivision and airflow diversion at the fluid channel outlet, leading to a subsequent narrowing. Specifically, this narrowing is greater than the narrowing at the fluid channel inlet. As a result, the flow velocity near the outlet increases again, while the air pressure decreases, leading to a further throttling effect in the airflow direction. This increases the pressure differential between the inlet and outlet, creating an additional suction effect and achieving controllable fluid acceleration through graded acceleration.

[0022] According to a second aspect of the present invention, a lighting and / or signal indication device is provided, comprising: a housing; a light source disposed in a cavity defined by the housing and fixed to the housing; a heat sink for LED headlights as described above; and a fan arranged to be fixed on the housing and pointing toward the multiple fins of the heat sink for LED headlights, and configured to guide air flow to a fluid channel between adjacent fins of the multiple fins, wherein the heat sink for LED headlights is heat-transferably connected to the light source, for example, the substrate of the heat sink abuts against and is fixed to the back side of the light source.

[0023] Since the lighting and / or signal indication device is provided with the aforementioned radiator for LED headlights, and the fan guides the airflow toward the fluid channels of adjacent fins, it not only has all the advantages of the aforementioned radiator, which will not be repeated here, but also facilitates the airflow from the fan to be guided through the radiator directly fixed to the light source, thereby maximizing the heat dissipation effect.

[0024] According to a third aspect of the present invention, there is also provided a motor vehicle comprising: a vehicle body; and the aforementioned lighting and / or signal indication device, which has similar advantages and will not be described in detail herein.

[0025] The technical solution provided by the present invention has the following advantages: the radiator, lighting and / or signal indication device and motor vehicle of the present invention can increase the flow rate of air flowing through the radiator through the above-mentioned configuration, thereby maximizing the dissipation of heat from the light source while ensuring smooth flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1( a ) shows a schematic structural diagram of a heat sink according to an embodiment of the present invention, wherein the cross section of the fin is a uniform shuttle shape;

[0027] FIG1( b ) shows a schematic structural diagram of a heat sink according to an alternative embodiment of the present invention, wherein the cross section of the fin is non-uniform and spindle-shaped and tapers toward the top end;

[0028] FIG1(c) is a schematic partial structural perspective view of an expanded embodiment of the heat sink shown in FIG1(a), wherein a portion of the surface of the heat sink base between two adjacent fins has a plurality of parallel ridges and grooves between the ridges;

[0029] FIG1(d) shows a schematic partial structural top view of another extended embodiment of the heat sink shown in FIG1(a), wherein a portion of the surface of the heat sink base between two adjacent fins has a plurality of holes;

[0030] FIG2( a ) shows a schematic structural diagram of a heat sink according to another embodiment of the present invention, wherein the cross section of the fins is a uniform spindle shape;

[0031] FIG2( b ) shows a schematic structural diagram of a heat sink according to an alternative embodiment of the present invention, wherein the cross section of the fin is a non-uniform spindle shape and tapers toward the top end;

[0032] FIG3( a ) shows a schematic structural diagram of a heat sink according to another embodiment of the present invention, wherein the cross section of the fin is a uniform ellipse;

[0033] FIG3( b ) shows a schematic structural diagram of a heat sink according to an alternative embodiment of the present invention, wherein the cross section of the fin is a non-uniform ellipse and tapers toward the top end;

[0034] FIG4( a ) shows a schematic structural diagram of a heat sink according to another embodiment of the present invention, wherein the cross section of the fin is a uniform rhombus;

[0035] FIG4( b ) shows a schematic structural diagram of a heat sink according to an alternative embodiment of the present invention, wherein the cross section of the fin is a non-uniform rhombus and tapers toward the top end;

[0036] Figure 5 The flow velocity distribution diagram of the radiator structure shown in FIG1( a ) after finite element modeling simulation is shown;

[0037] FIG6( a ) shows a schematic structural diagram of a conventional heat sink according to the prior art, wherein the cross section of the fin is a uniform rectangle;

[0038] FIG6( b ) shows the flow velocity distribution diagram of the radiator structure shown in FIG6( a ) after finite element modeling simulation;

[0039] FIG7( a ) shows a schematic partial structural perspective view of another extended embodiment of the heat sink shown in FIG1( a ), wherein a portion of the surface of the heat sink base between two adjacent fins has at least one first protrusion 4 arranged adjacent to the distal end in the longitudinal direction of the fin;

[0040] FIG7( b ) shows a schematic partial structural perspective view of another extended embodiment of the heat sink shown in FIG1( a ), wherein a portion of the surface of the heat sink base between two adjacent fins has at least one second protrusion 5 arranged adjacent to the proximal end in the longitudinal direction of the fin;

[0041] FIG7( c ) shows a schematic partial structural perspective view of yet another extended embodiment of the heat sink shown in FIG1( a ), wherein the first protrusion 4 shown in FIG7( a ) and the second protrusion 5 shown in FIG7( b ) are both provided on the substrate of the heat sink;

[0042] Figure 8 A schematic structural diagram of a lighting and / or signal indication device according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0043] The technical solution of the present disclosure is further specifically described below through examples and in conjunction with the accompanying drawings. In the specification, the same or similar figure numerals represent components with the same or similar functions. The following description of the embodiments of the present disclosure with reference to the accompanying drawings is intended to explain the overall inventive concept of the present disclosure and should not be construed as a limitation of the present disclosure. In addition, in the detailed description below, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is obvious that one or more embodiments can also be implemented without these specific details.

[0044] To address the aforementioned issues that need to be addressed in the prior art, embodiments of the present disclosure also propose utilizing heat generated by the light source of a lamp to heat a transparent cover and / or lens. For example, a hot air flow heated by the heat in the chamber defined by the lamp housing is directed toward the inner surface of the transparent cover or lens. Thus, embodiments exemplarily provide a heat sink for achieving this purpose.

[0045] FIG1( a ) shows a schematic structural diagram of a heat sink according to an embodiment of the present disclosure.

[0046] According to an overall technical concept of an embodiment of the present disclosure, a heat sink 100 is provided, comprising: a substrate 1; and a plurality of fins 2, which are respectively arranged to extend vertically or obliquely from the substrate and are spaced apart from each other, wherein each of the plurality of fins 2 is arranged to contract toward the proximal end and the distal end in the respective length directions (as shown by arrow y in FIG1(a)), and the substrate 1 and adjacent fins of the plurality of fins 2 jointly define a fluid channel 3 between them.

[0047] With this arrangement, the orthographic projection of each fin 2 on a plane parallel to the substrate 1 gradually contracts toward its proximal and distal ends at least along its length direction y, thereby forming a fluid channel 3 that first contracts and then expands between adjacent fins 2. In practice, this is equivalent to each of the plurality of fins 2 being configured to have a cross-section that contracts along its length direction y toward its distal end, which is adjacent to the fluid discharge side of the fluid channel 3, and toward its proximal end, which is adjacent to the fluid inflow side of the fluid channel 3.

[0048] According to Bernoulli's principle, this arrangement, on the one hand, helps reduce the flow resistance of the fluid channel 3 between adjacent fins 2, allowing the fluid to enter the fluid channel 3 more smoothly and accelerate the fluid through a gradually narrowing previous fluid channel section 31, thereby increasing the efficiency of removing heat from the heat sink 100 substrate 1; and on the other hand, it facilitates controlling the increase in fluid velocity through a slightly widened subsequent fluid channel section 32 to avoid excessive acceleration of the fluid to form a jet-like outflow and backflow caused by impact at the outlet of the fluid channel 3. It also avoids the formation of vortices at the outlet of the fluid channel 3 due to separation of the boundary layer, thereby ensuring smooth fluid outflow while ensuring heat dissipation. Through this arrangement, the flow resistance in the fluid channel 3 is reduced and the flow velocity is appropriately increased, thereby facilitating the removal of condensation.

[0049] According to an embodiment of the present disclosure, for example, as shown in FIG1(a), each of the plurality of fins 2 has a pair of side surfaces 21, 22 arranged opposite to each other in the transverse direction of their respective length directions (as shown by arrow x in FIG1(a)), and the projection of each of the side surfaces on a plane parallel to the substrate is a smooth curve or a straight line, that is, each side of the cross section is a smooth curve or a straight line. Preferably, the curvature of each point on each side is continuous. More preferably, the curvature change rate of each point on each side is continuous. And the tangent direction at each point on such a smooth curve or straight line is set to be substantially the same as the direction of the fluid flowing therethrough, or alternatively, is set to be less than a threshold angle with the direction of the fluid flowing therethrough. (eg 5°), whereby the side surface of each fin is substantially configured to have a smooth surface profile, thereby facilitating the fluid to flow smoothly through the side surface without being obstructed or disturbed thereby.

[0050] Specifically, according to an embodiment of the present disclosure, each of the plurality of fins has, for example, a variety of cross-sectional forms on a plane parallel to the substrate. More specifically, as shown in Figures 1(a) and 1(b), each fin 2 has a spindle-shaped cross-section extending along its length and having sharp ends at both ends; as shown in Figures 2(a) and 2(b), each fin 2' has a spindle-shaped cross-section extending along its length and having blunt ends that are narrowed at both ends; as shown in Figures 3(a) and 3(b), each fin 2" has an elliptical cross-section extending along its length and having smooth curves that are narrowed at both ends; and as shown in Figures 4(a) and 4(b), each fin 2"' has a diamond-shaped cross-section extending along its length and having sharp ends.

[0051] Among them, typically, since the sides of the shuttle-shaped, spindle-shaped and elliptical cross-sections shown in the figure are curved, the side surface of each fin is actually a smooth curved surface. Compared with the diamond-shaped cross-section, the sides are straight lines, so there must be a turning point where the curvature suddenly changes at the intersection of the straight lines. The fins with shuttle-shaped, spindle-shaped and elliptical cross-sections are easier to achieve smooth acceleration and deceleration of the fluid, and are less likely to be disturbed, thereby avoiding turbulence.

[0052] According to an embodiment of the present disclosure, as shown in Figures 1(a) and 1(b), for example, the length directions of the plurality of fins 2 are parallel to each other, so that the fluid flows flowing out of adjacent fluid channels 3 flow in substantially the same direction and are not easily interfered with each other; and more preferably, for example, the plurality of fins are also spaced apart at equal intervals in the transverse direction of their respective length directions (as shown by arrow x), so that the fluid flows flowing out of adjacent fluid channels 3 are uniform. Similarly, as shown in Figures 2(a) and 2(b), Figures 3(a) and 3(b), and Figures 4(a) and 4(b), the fins can be similarly arranged, thereby achieving similar technical effects, which will not be described in detail here.

[0053] According to an exemplary embodiment of the present disclosure, as shown in FIG1( a ), for example, the minimum distance D between adjacent fins in the plurality of fins 2 is gap Greater than the maximum width of the two adjacent fins, that is, greater than the width W of each of the two fins a 、W b , and is smaller than the sum of the maximum widths of the adjacent fins (W a +W b ). According to finite element modeling and simulation, such a gap and width relationship is confirmed to be conducive to the generation of a gently accelerated fluid flow pattern and is not prone to boundary layer separation at the outlet.

[0054] Furthermore, as an example, each of the plurality of fins is configured to have the same three-dimensional shape, such as shown in Figures 1(a), 2(a), 3(a), and 4(a), and the width of each fin is set to be less than 5 mm, for example, in the range of 2 mm to 5 mm; the fin gap is correspondingly set to be in the range of 2 mm to 5 mm. Preferably, the maximum width of a single fin is, for example, 3.2 mm; correspondingly, the minimum gap between the fins is, for example, 4.3 mm.

[0055] As an example, the thickness of the fins is, for example, in the range of 2 mm to 5 mm, such as 3 mm to 5 mm. The height of the fins can be determined based on actual design requirements, and the length generally depends on the extent of the area to be dissipated on the substrate. Generally speaking, the larger the side surface area of the fins, the larger the heat dissipation area and the better the heat dissipation effect. However, as the height of the fins along the normal direction n of the substrate increases, so that the top of the fin is sufficiently far away from the substrate, the height of the fins is typically set to be between 10 mm and 50 mm, such as approximately 10 times the fin width or the fin gap.

[0056] Preferably, a finite element modeling analysis is performed on a heat sink with uniform fusiform cross-section fins as shown in FIG1(a) to analyze the fluid flow velocity distribution through the heat sink, and its parameters are set, for example, as shown in FIG1(a), when the maximum fin width is set to 3.2 mm and the corresponding minimum gap between the fins is set to 4.3 mm, the fin height is set to 30 mm, for example; and it is assumed that the heat sink substrate has a cross-section with a side length of 50 mm. By performing finite element simulation on the model, the following is obtained: Figure 5 The flow velocity distribution pattern of the fluid through the heat sink model is shown.

[0057] Furthermore, a conventional heat sink arrangement with uniformly thick, parallel-distributed rectangular fins is schematically shown in Figure 6(a). To compare the fluid velocity distribution patterns, a model analysis of this conventional heat sink was performed. For example, the parameters were set as follows: the fins had uniform thickness, and their width, gap, and height were typically set to 3 mm, 4.5 mm, and 30 mm, respectively. This yielded the fluid velocity distribution pattern of the model of this conventional heat sink, as shown in Figure 6(b).

[0058] The finite element simulation flow velocity distribution diagram corresponding to the schematic radiator of the present disclosure shown in FIG1(a) is Figure 5 , compared with the finite element simulation velocity distribution diagram corresponding to the conventional radiator in the field shown in FIG6(a), that is, FIG6(b), the following are obtained: Figure 5 The flow velocity values at sampling points ①, ②, and ③ on the lower, middle, and upstream sides of the fin's side surface, respectively, as shown in Figure 6(b), are compared with Table 1, as follows:

[0059] Existing technology models Current design model ratio Sampling point 1 0.37m / s 0.70m / s 189％ Sampling point 2 0.53m / s 0.96m / s 181％ Sampling point 3 0.59m / s 0.76m / s 129％

[0060] Table 1

[0061] As can be seen in the table above, in the application of conventional radiators of the prior art, the flow rate of the fluid flowing through them gradually decreases. In contrast, in the application of the current arrangement of the radiator, compared with the conventional radiators of the prior art, the flow resistance is effectively reduced and the flow rate at the outlet of the fluid channel is significantly increased. This increase in flow rate is achieved by first gradually increasing the flow rate and then gradually decreasing the flow rate, which facilitates controlling the increase in flow rate within a certain range during the process of fluid flowing through it, rather than a monotonic change. This avoids backflow caused by impact on the fin tips at the outlet, and also avoids the formation of vortices at the outlet of fluid channel 3 due to separation of the boundary layer.

[0062] In a further embodiment of the present disclosure, for example, the surface of the portion of the substrate located between adjacent fins among the plurality of fins is configured to be uneven. For example, the portion of the substrate surface between two adjacent fins is configured to be an uneven surface with a dot-like protrusion pattern / a frosted pattern, or an uneven surface with undulating waves; or, for example, as shown in FIG1(c), the portion of the substrate surface between two adjacent fins is formed to have a plurality of parallel extended ridges 11 extending along its longitudinal direction and narrow grooves 12 between the ridges. Such a configuration facilitates increasing the total heat dissipation area of the substrate surface to be dissipated and the fluid flowing through it, thereby enhancing heat exchange between the two and improving heat dissipation efficiency.

[0063] In an alternative embodiment of the present disclosure, for example, as shown in FIG1(d), the portion of the substrate located between adjacent fins may be further provided with a plurality of holes 13. Such holes 13 may be recessed portions or non-through countersunk holes. This arrangement also facilitates increasing the total heat dissipation area between the substrate's surface to be dissipated and the fluid flowing therethrough, thereby enhancing heat exchange between the two and improving heat dissipation efficiency.

[0064] In another embodiment of the present disclosure, for example, each of the plurality of fins is configured to taper outward along the normal direction n of the substrate. More specifically, as shown in FIG1(b), as an alternative to FIG1(a), a heat sink having a fin 2 in the shape of a truncated cone is shown, wherein the cross-section of each fin is still spindle-shaped, but the cross-sectional size gradually decreases toward the top of the fin (i.e., in the direction away from the substrate 1) as the fin height increases. As shown in FIG2(b), as an alternative to FIG2(a), a heat sink having a fin 2' in the shape of a truncated cone is shown, wherein the cross-section of each fin is still spindle-shaped, but the cross-sectional size gradually decreases toward the top of the fin (i.e., in the direction away from the substrate 1) as the fin height increases. As shown in FIG3(b), as an alternative to FIG3(a), a heat sink having fins 2" in the shape of a frustum is shown. The cross section of each fin is still elliptical, but the cross-sectional size gradually decreases toward the top of the fin (i.e., in the direction away from the substrate 1) as the fin height increases. As shown in FIG4(b), as an alternative to FIG4(a), a heat sink having fins 2"' in the shape of a frustum is shown. The cross section of each fin is still diamond-shaped, but the cross-sectional size gradually decreases toward the top of the fin (i.e., in the direction away from the substrate 1) as the fin height increases.

[0065] By providing such a frustum-shaped alternative fin, whose dimensions taper toward its tip, the flow cross-section of fluid channel 3 narrows as it approaches base plate 1 along the fin's height direction. This significantly increases the fluid flow velocity adjacent to base plate 1, speeding up direct heat exchange with the base plate and improving heat dissipation efficiency. Simultaneously, the fluid flow velocity is not uniformly altered across the entire fin's side surface (particularly near its tip), facilitating the ability to adjust the flow velocity gradient distribution along the height direction by customizing the fin's height inclination.

[0066] In a further embodiment of the present disclosure, as shown in FIG7(a), the heat sink further comprises, for example: at least one first protrusion 4, provided on the substrate 1 and located between adjacent fins among the plurality of fins 2, and arranged adjacent to the distal ends of the respective adjacent fins 2 in the longitudinal direction y. More specifically, for example, as shown in the figure, each of the first protrusions 4 is configured to have a width W in the transverse direction x of the respective adjacent fins 2 in the longitudinal direction y that gradually increases toward the distal end. x-4In other words, the first protrusion is configured to have a shape in which the dimension in the direction transverse to the length direction gradually increases toward the distal end. Through this arrangement, the aforementioned subsequent fluid channel section 32 is subdivided into a plurality of outflow sub-channels, so that the fluid is again diverted through these outflow sub-channels near the distal end; and according to Bernoulli's principle, the existence of such outflow sub-channels leads to the convergence of the flow area of the fluid channel (especially because the first protrusion has a width W that widens toward the distal end). x-4 This exacerbates the contraction of the flow area, further creating a diversion effect at the outlet of the fluid channel, resulting in a further throttling effect. This, in turn, causes a change in the pressure differential, increasing the pressure gradient and generating an additional suction effect at the outlet. This suction further facilitates the outflow of the fluid, thereby creating a secondary acceleration of the outgoing fluid. Thus, by providing the additional first protrusions 4, the outgoing fluid, which has undergone the acceleration and deceleration process, is re-accelerated, achieving a step-by-step controlled acceleration, thus avoiding the monotonous change in flow velocity from the thicker middle portion of the fin toward the downstream, and the resulting uncontrolled outflow of the fluid.

[0067] In another further embodiment of the present disclosure, the heat sink may alternatively include (i.e., as shown in FIG7(b)) or additionally include (i.e., as shown in FIG7(c)) at least one second protrusion 5, which is provided on the substrate 1 and is located between adjacent fins among the plurality of fins 2, and is arranged adjacent to the proximal ends of each of the adjacent fins 2 in the longitudinal direction y. The provision of such a second protrusion 5 facilitates disturbance and appropriate retardation of the fluid at the entrance of the wider fluid channel, thereby facilitating sufficient heat exchange between the accelerated fluid near the entrance of the fluid channel and the heat dissipating substrate. At the same time, since the entrance of the fluid channel is relatively wide and the initial flow velocity of the fluid entering the fluid channel is slightly slower than that of the downstream, the provision of the second protrusion 5 does not cause excessive retardation to the subsequent acceleration of the fluid.

[0068] In a further embodiment of the present disclosure, as shown in FIG7(c), when the first protrusion 4 and the second protrusion 5 are provided on the substrate at the same time, for example, each of the second protrusions 5 is spaced apart from the adjacent fins 2 in the lateral direction by a distance D x-5 The minimum value is greater than the distance D between each of the first protrusions 4 and the adjacent fins 2 in the lateral direction. x-4, thus, the width of a single one of the multiple inlet sub-channels generated after the second protrusion 5 diverts the flow near the inlet of the fluid channel 3 should be greater than the width of a single one of the multiple outflow sub-channels generated after the first protrusion 4 diverts the flow near the outlet of the fluid channel 3, so that: compared with the final outflow flow rate generated by the radiator without both the first and second protrusions (for example, as shown in Figure 1(a)), the effect of the second protrusion 5 on the inflow fluid with a lower initial velocity near the inlet on the final outflow flow rate should be much smaller than the effect of the first protrusion 4 on the outflow flow rate whose flow velocity has increased near the outlet on the final outflow flow rate.

[0069] In a further embodiment of the present disclosure, as shown in FIG. 7( c ), when the first protrusion 4 and the second protrusion 5 are provided on the substrate at the same time, for example, the distance D between each of the first protrusions 4 and the edge at the distal end of the substrate 1 is y-4 greater than the distance D between each of the second protrusions 5 and the edge of the substrate at the proximal end y-5 In other words, the first protrusion 4 is closer to the turning point on the surface of each fin where the curvature direction changes than the second protrusion 5. Consequently, the first protrusion 4 is closer to the transition point in the fluid channel between the preceding fluid channel section 31 (for accelerating the fluid) and the subsequent fluid channel section 32 (for decelerating the fluid) than the second protrusion 5. That is, the first protrusion 4 is positioned deeper into the fluid channel than the second protrusion 5. This arrangement allows the first protrusion 4 to have a much greater impact on the fluid flow rate than the second protrusion 5. This further reduces the length of the fluid channel section between the first and second stages of acceleration. Consequently, compared to the final outflow velocity produced by a heat sink without both first and second protrusions (e.g., as shown in FIG1(a)), the effect of the second protrusion 5 on the lower initial velocity of the inflow near the inlet should be much smaller than the effect of the first protrusion 4, which is deeper in the fluid channel, on the already increased velocity of the outflow near the outlet.

[0070] In a further embodiment of the present disclosure, as shown in FIG7(c), when both the first protrusion 4 and the second protrusion 5 are provided on the substrate, since the flow velocity distribution at the outlet of the fluid channel, for example, at the same distance along the fin length direction y, needs to be as uniform as possible, and the heat exchange between the fluid and the substrate needs to be as sufficient as possible at the inlet of the fluid channel, the height of the second protrusion 5 does not necessarily need to be set to be close to the fin height, while the height of the first protrusion 4 needs to be set to be as close to the fin height as possible. Thus, for example, the height H of each of the first protrusions 4 in the normal direction n of the substrate is n-4greater than the height H of each of the second protrusions 5 in the normal direction n of the substrate n-5 Thus, the efficiency of direct heat exchange with the substrate is maximized while the outflow velocity is evenly distributed.

[0071] According to another aspect of the present disclosure, Figure 8 As shown, a lighting and / or signal indicating device 200 is provided, comprising: a housing 101; a light source 102, which is disposed in a cavity 103 defined by the housing and fixed to the housing 101; a heat sink 100 according to the aforementioned embodiment; and a fan, which is arranged to be fixed on the housing 101 and pointing to the plurality of fins 2 of the heat sink, and is configured to guide air flow toward the fluid channel 3, wherein the substrate 1 of the heat sink 100 is arranged to abut against and be fixed to the flat back side of the light source 102.

[0072] This lighting and / or signaling device 200, by including the aforementioned heat sink 100, achieves the aforementioned technical effect of reducing flow resistance to achieve a controllable increase in flow rate, and possesses all the advantages of the aforementioned heat sink, which will not be further elaborated. Furthermore, it facilitates directing airflow from the fan through the heat sink, which is directly attached to the light source, thereby maximizing the heat dissipation effect.

[0073] According to yet another aspect of the present disclosure, a motor vehicle is provided, comprising: a vehicle body; and the aforementioned lighting and / or signaling device. Because the motor vehicle includes the aforementioned radiator 100, the aforementioned technical effect of reducing flow resistance to achieve a controllable increase in flow rate is achieved, and all the advantages of the aforementioned radiator are achieved, which will not be further elaborated.

[0074] Although the present invention has been described in conjunction with the accompanying drawings, the embodiments disclosed in the drawings are intended to exemplify the preferred embodiments of the present invention and should not be construed as limiting the present invention.

[0075] Although some embodiments of the present general inventive concept have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the present general inventive concept, the scope of which is defined in the claims and their equivalents.

Claims

1. A radiator (100) for an LED headlamp, comprising: base(1); and A plurality of fins (2) are arranged to extend vertically or obliquely from the base plate (1) and are spaced apart from each other. Each of the plurality of fins (2) is configured to contract toward both the proximal end and the distal end in its respective length direction, and the base plate and adjacent fins of the plurality of fins (2) jointly define a fluid channel (3) therebetween; The length directions of the plurality of fins (2) are parallel to each other. The heat sink further comprises: at least one first protrusion (4) provided on the base plate (1) and located between adjacent fins among the plurality of fins (2), and arranged adjacent to the distal ends of the respective adjacent fins in the length direction.

2. The heat sink (100) for an LED headlamp according to claim 1, wherein: Each of the plurality of fins (2) has side surfaces (21, 22) arranged opposite to each other in the transverse direction of the respective length directions, the projection of each of the side surfaces on a plane parallel to the base plate (1) being a smooth curve or a straight line, and the tangent direction at each point on the side surface is set to: in substantially the same direction as the fluid flowing through it; or The angle between the angle and the direction of the fluid flowing through the area is less than a threshold angle.

3. The heat sink (100) for an LED headlamp according to claim 2, wherein: Each of the plurality of fins (2) has a spindle-shaped, elliptical, shuttle-shaped, or diamond-shaped cross section on a plane parallel to the base plate (1).

4. The heat sink (100) for an LED headlamp according to claim 1, wherein: The plurality of fins (2) are spaced apart at equal intervals in a direction transverse to their respective length directions.

5. The heat sink (100) for an LED headlamp according to claim 1, wherein: Each of the plurality of fins (2) is configured to have the same three-dimensional shape.

6. The heat sink (100) for an LED headlamp according to any one of claims 1 to 5, wherein: The surface of a portion of the base plate (1) located between adjacent fins among the plurality of fins (2) is configured to be uneven.

7. The heat sink (100) for an LED headlamp according to any one of claims 1 to 5, wherein: A portion of the base plate (1) located between adjacent fins among the plurality of fins (2) is provided with a plurality of holes (13).

8. The heat sink (100) for an LED headlamp according to any one of claims 1 to 5, wherein: Each of the plurality of fins (2) is arranged to taper outward along the normal direction of the base plate (1).

9. The heat sink (100) for an LED headlamp according to claim 1, wherein: Each of the first protrusions (4) is configured to have a width in a transverse direction of the respective length directions of adjacent fins (2) that gradually increases toward the distal end.

10. The heat sink (100) for an LED headlamp according to claim 1, further comprising: At least one second protrusion (5) is provided on the base plate (1) and is located between adjacent fins among the plurality of fins and is arranged adjacent to the proximal ends of the adjacent fins in the length direction.

11. The heat sink (100) for an LED headlamp according to claim 10, wherein: The minimum value of the distance between each of the second protrusions (5) and the adjacent fins is greater than the maximum value of the distance between each of the first protrusions (4) and the adjacent fins.

12. The heat sink (100) for an LED headlamp according to claim 10, wherein: The distance between each of the first protrusions (4) and the edge at the distal end of the substrate is greater than the distance between each of the second protrusions (5) and the edge at the proximal end of the substrate (1).

13. The heat sink (100) for an LED headlamp according to claim 10, wherein: The height of each of the first protrusions (4) in the normal direction of the substrate (1) is greater than the height of each of the second protrusions (5) in the normal direction of the substrate (1).

14. A lighting and / or signaling device (200), comprising: Housing (101); A light source (102) is disposed in a cavity defined by the housing (101) and is fixed to the housing (101); A heat sink (100) for an LED headlamp according to any one of claims 1 to 13; and a fan, arranged to be fixed on the housing (101) and directed toward the plurality of fins (2) of the radiator for the LED headlight, and configured to guide air flow toward the fluid channel (3), The LED headlight heat sink (100) is connected to the light source (102) in a heat transfer manner.

15. A motor vehicle comprising: body; and The lighting and / or signaling device (200) according to claim 14.

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