LED street lamp capable of enhancing natural convection

Abstract

The application discloses an LED street lamp capable of enhancing natural convection, which comprises a lamp body, heat dissipation fins on the top of the lamp body, and a heat dissipation member arranged on the top of the lamp body. The heat dissipation member and the top of the lamp body form a containing cavity containing the heat dissipation fins, the side surface of the heat dissipation member is provided with an air inlet, and the top of the heat dissipation member is provided with an air outlet channel, which jointly form a chimney type heat dissipation structure. The lower end of the air outlet channel is in a horn shape with a large lower end and a small upper end, and the upper end is internally provided with a honeycomb flow guide plate; and the bottom of the air inlet is provided with an outward inclined surface. The structure limits hot air to rise in the channel, forms stable natural exhaust by using thermal pressure difference, and significantly enhances convection heat dissipation; the horn-shaped inlet accelerates airflow, the honeycomb flow guide plate reduces noise, prevents foreign matters and enhances structural strength; the side surface diffuses air inlet to make cooling uniform, and the inclined surface drains water to prevent water accumulation. The utility model has the advantages of high heat dissipation efficiency, wind disturbance resistance, low noise, foreign matter prevention, effective reduction of LED junction temperature and prolongation of lamp life.

Description

Technical Field

[0001] This application relates to the field of LED lighting technology, specifically to an LED street light that can enhance natural convection. Background Technology

[0002] In the field of LED streetlights, heat dissipation performance directly affects the light decay, lifespan, and reliability of the luminaire. Currently, the common heat dissipation solution for LED streetlights involves setting multiple vertically arranged heat dissipation fins on the top of the lamp body, relying on natural convection heat exchange between the fins and the air. However, this open structure has significant shortcomings: the air around the fins is only driven by the weak buoyancy generated by the density change after heating, forming a localized, low-speed upward flow, making it difficult for heat to be quickly dissipated. Especially in windless or high-temperature environments, the heat dissipation effect drops sharply, leading to an increase in the junction temperature of the LED chip, accelerating light decay, and shortening the lifespan of the luminaire. Utility Model Content

[0003] To address the poor heat dissipation of existing LED streetlights, this application provides an LED streetlight that enhances natural convection. The specific technical solution of this application is as follows:

[0004] An LED street light that enhances natural convection includes: a lamp body and a heat sink. The top of the lamp body is provided with heat sink fins. The heat sink is disposed on the top of the lamp body and forms a cavity with the top of the lamp body to accommodate the heat sink fins. The top of the heat sink is provided with an air outlet channel, and the side of the heat sink is provided with an air inlet. The air inlet, the cavity, and the air outlet channel form a chimney-like air outlet structure to dissipate heat from the heat sink fins. The upper end of the air outlet channel is cylindrical, and the lower end of the air outlet channel is a funnel-shaped structure that is wider at the bottom and narrower at the top. The bottom surface of the air inlet is an outward-facing slope.

[0005] Furthermore, a honeycomb-shaped guide plate is provided at the upper end of the air outlet duct.

[0006] Furthermore, the air inlets are arranged on the side of the heat sink.

[0007] Furthermore, the top edge of the lamp body is provided with a stud for mounting screws, and the bottom of the heat sink extends outward to form a support strip, on which a placement hole for placing the stud is provided.

[0008] Furthermore, the top of the lamp body is provided with a protrusion, and one side of the top of the heat sink is provided with a notch that matches the protrusion. When the notch fits into the protrusion, the receiving cavity is closed by the side of the protrusion.

[0009] Furthermore, the heat dissipation fins are provided with slots.

[0010] This invention achieves efficient natural ventilation and heat dissipation by enclosing the heat sink with the top of the lamp body to form a chimney-like air duct and optimizing the design of the air inlet and outlet. The specific technical effects are as follows:

[0011] The chimney effect enhances the thermal pressure difference, creating stable natural ventilation: the heat sink and the top of the lamp body together form a cavity to accommodate the heat sink fins, which, together with the air inlet on the side and the air outlet on the top, forms a closed chimney-like ventilation structure. Hot air is confined to rise within the channel, and the thermal pressure difference is much greater than in an open space, resulting in stable and rapid natural ventilation, significantly enhancing air convection and improving heat dissipation efficiency.

[0012] The trumpet-shaped air outlet channel accelerates airflow and has strong anti-disturbance capabilities: The lower end of the air outlet channel is designed with a trumpet-shaped structure that is larger at the bottom and smaller at the top. The inlet cross-sectional area is large and the outlet cross-sectional area is small. The airflow is accelerated in the channel, and the outlet velocity increases. At the same time, the pressure at the inlet is slightly lower than that of the straight pipe, which further enhances the suction capacity.

[0013] Honeycomb baffles reduce noise, prevent foreign objects from entering, and enhance structural strength: Honeycomb baffles are installed inside the upper part of the air outlet duct to disperse the concentrated airflow into multiple small airflows, effectively reducing airflow noise; at the same time, the honeycomb holes can prevent leaves, insects and other debris from falling into the chimney and prevent blockage; in addition, the baffles also play a structural support role, enhancing the stability of the air outlet duct.

[0014] Side-mounted diffused air intake and sloping drainage enhance environmental adaptability: The air intake is arranged in a multi-hole pattern on the side of the heat sink, with each small opening generating a low-velocity diffused airflow. Combined with the internal vertical heat sink fin structure, this allows for more even distribution of cooling air between the fins. The bottom of the air intake is sloping outwards, facilitating the smooth flow of rainwater from the top of the lamp body out of the containment cavity, preventing water accumulation, corrosion, or impaired heat dissipation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an LED street light in one embodiment of this application;

[0016] Figure 2 This is an exploded view of an LED street light in one embodiment of this application. Figure 1 ;

[0017] Figure 3 This is an exploded view of an LED street light in one embodiment of this application. Figure 2 ;

[0018] Figure 4 This is a top view of an LED street light in one embodiment of this application;

[0019] Figure 5 This is a cross-sectional schematic diagram of an LED street light in one embodiment of this application.

[0020] Reference numerals: 1. Lamp body; 2. Heat sink; 3. Heat sink fins; 4. Receiving cavity; 5. Air outlet; 6. Air inlet; 7. Guide plate; 8. Angled surface; 9. Screw; 10. Stud; 11. Support bar; 12. Placement hole; 13. Protrusion; 14. Recess; 15. Groove. Detailed Implementation

[0021] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0022] In the description of this application, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this application.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" or "second" to define a feature may explicitly or implicitly include one or more of that feature, and in the description of this application, "at least" means one or more, unless otherwise explicitly specified.

[0024] In this application, unless otherwise expressly specified and limited, the terms "assembly," "connection," and "joining" shall be interpreted broadly. For example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may also refer to a mechanical connection; they may refer to a direct connection or a connection through an intermediate medium; or they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0025] In the application, unless otherwise specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "below," and "over" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Above," "below," and "below" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] The following description, in conjunction with the accompanying drawings, further illustrates specific embodiments of this application, making the technical solution and its beneficial effects clearer and more explicit. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, but should not be construed as limiting it.

[0027] like Figures 1 to 5As shown, this utility model provides an LED street light that enhances natural convection, comprising: a lamp body 1 and a heat sink 2. The top of the lamp body 1 is provided with heat sink fins 3 (usually multiple parallel metal sheets to increase the heat dissipation surface area). The heat sink 2 is disposed on the top of the lamp body 1 and together with the top of the lamp body 1 forms a receiving cavity 4 to accommodate the heat sink fins 3 (i.e., the heat sink 2 covers the heat sink fins 3, forming an enclosing space between itself and the lamp body 1). The heat sink 2 can be fixed to the top of the lamp body 1 by means of clips, screws 9, glue, etc. The top of the heat sink 2 is provided with an air outlet channel 5 (as an outlet channel for hot air), and the side of the heat sink 2 is provided with an air inlet 6 (as an inlet for cold air). The air inlet 6, the receiving cavity 4, and the air outlet channel 5 together form a chimney-like air outlet structure to dissipate heat from the heat sink fins 3 through natural convection. The chimney structure confines hot air within the exhaust duct 5, creating a thermal pressure difference far greater than in open spaces (due to the low density of hot air, it rises in the vertical duct, generating upward suction). This results in stable and rapid natural ventilation, significantly improving the heat dissipation effect of the heat dissipation fins 3. During natural convection, the air velocity is typically only 0.1–0.3 m / s, with a thicker boundary layer, limiting heat dissipation capacity to weak convection. When using the chimney structure, the theoretical calculation formula for the chimney effect's exhaust velocity, v = sqrt(2gH*ΔT / T_avg), is used (where v is the exhaust velocity, g is the acceleration due to gravity, H is the chimney height, ΔT is the inlet / outlet temperature difference, and T_avg is the average temperature). The chimney height H and the inlet / outlet temperature difference ΔT together determine the exhaust velocity v, which can theoretically reach 0.5–1.5 m / s or even higher, thus significantly reducing the fin surface temperature. Under certain conditions, the technical solution of this application can achieve a significantly better heat dissipation effect than traditional solutions. The cross-section of the air outlet duct 5 can be cylindrical, square, elliptical, or pill-shaped (i.e., a shape with two semicircles on both sides and a rectangle in the middle). Multiple air outlet ducts 5 can be provided on the top of the heat sink 2, depending on the length of the lamp body 1 (for example, 2-4 evenly arranged along the length of the lamp body 1). The heat sink 2 also serves to shield the sun, preventing direct sunlight from shining on the heat sink fins 3 and affecting their heat dissipation.

[0028] In one embodiment, the upper end of the air outlet duct 5 is cylindrical (a straight pipe section of equal diameter), and the lower end of the air outlet duct 5 is a funnel-shaped structure that is wider at the bottom and narrower at the top (i.e., the cross-section gradually narrows from bottom to top). The large inlet and small outlet increase the outlet flow velocity, which helps to overcome external wind pressure disturbances (such as crosswind interference); at the same time, the pressure at the inlet is slightly lower than that of the straight pipe (according to Bernoulli's principle, the static pressure in the contraction section decreases), which can enhance the chimney effect of air extraction capacity.

[0029] In one embodiment, a honeycomb-shaped guide plate 7 (i.e., a plate-like structure composed of multiple hexagonal or circular holes) is provided in the upper end of the air outlet duct 5. The guide plate 7 disperses the concentrated airflow into multiple micro-airflows, reduces the outlet wind speed, and reduces airflow noise; at the same time, it prevents debris (leaves, insects) from falling directly into the chimney, and also enhances the robustness of the air outlet duct 5 (because the guide plate 7 acts as a lateral support, increasing structural rigidity).

[0030] In one embodiment, the bottom surface of the air inlet 6 is an outward-facing slope 8 (i.e., the lower edge of the air inlet 6 slopes outward), facilitating the outflow of rainwater from the top of the lamp body 1 into the receiving cavity 4 (preventing rainwater from accumulating at the bottom of the receiving cavity 4). The main body of the lamp body 1 is integrally formed, and the LED beads are located at the bottom of the lamp body 1. This is because when rainwater enters the receiving cavity 4 from the air outlet 5, it only enhances the heat dissipation effect of the heat sink fins and does not adversely affect the use of the LED beads. If the airflow velocity in the air outlet 5 is high, the part of the heat sink fins 3 near the air inlet 6 will come into contact with the airflow, and the temperature will decrease. Under the action of heat conduction, the heat in the middle part of the heat sink fins 3 will be conducted to the side part, thereby reducing the temperature of the entire heat sink fins 3.

[0031] In one embodiment, the air inlets 6 are arranged on the side of the heat sink 2 (e.g., multiple elongated or round holes are evenly distributed along the length direction). The airflow generated by each small inlet is low and enters the interior in a diffuse manner, so that the airflow is more evenly distributed to the channels between each heat sink fin 3.

[0032] In one embodiment, the top edge of the lamp body 1 is provided with a stud 10 (a raised threaded post) for mounting screws 9, and the bottom of the heat sink 2 extends outward to form a support strip 11 (a horizontally extending thin plate). The support strip 11 is provided with a placement hole 12 for placing the stud 10. The heat sink 2 is fixed to the top of the lamp body 1 by screwing the stud 10 into the support strip 11 with screws 9, thereby enhancing its firmness.

[0033] In one embodiment, the top of the lamp body 1 is provided with a protrusion 13 (usually a box-shaped protrusion). The interior of the protrusion 13 is generally used to house the LED driver (power module). One side of the top of the heat sink 2 is provided with a recess 14 (i.e., a U-shaped or rectangular notch) that mates with the protrusion 13. When the recess 14 is in contact with the protrusion 13, the side of the protrusion 13 closes the receiving cavity 4 (i.e., the heat sink 2 does not have a side plate on one side, and the outer wall of the protrusion 13 acts as a baffle). The absence of a baffle on one side of the heat sink 2, and the closure of the receiving cavity 4 by the protrusion 13, effectively reduces the weight and material requirements of the heat sink 2.

[0034] As one embodiment, the heat dissipation fin 3 is provided with a slot 15 (i.e., a notch is opened at the edge or middle of the fin). When the top of the receiving cavity 4 is too close to the top of the heat dissipation fin 3, air can be transmitted through the slot 15 (to avoid airflow obstruction and allow air to flow laterally between the fins).

[0035] This utility model achieves efficient natural ventilation and heat dissipation by forming a chimney-like air duct by enclosing the heat sink 2 with the top of the lamp body 1 and optimizing the design of the air inlet and outlet. The specific technical effects are as follows:

[0036] The chimney effect enhances the thermal pressure difference, creating stable natural ventilation: The heat sink 2 and the top of the lamp body 1 together form a cavity 4 that accommodates the heat sink fins 3. Together with the air inlet 6 on the side and the air outlet duct 5 on the top, they form a closed chimney-like ventilation structure. Hot air is confined within the duct and rises, resulting in a thermal pressure difference much greater than in an open space. This produces stable and rapid natural ventilation, significantly enhancing air convection and improving heat dissipation efficiency.

[0037] The horn-shaped air outlet channel 5 accelerates airflow and has strong anti-disturbance capabilities: The lower end of the air outlet channel 5 is designed with a horn-shaped structure that is larger at the bottom and smaller at the top. The inlet cross-sectional area is large and the outlet cross-sectional area is small. The airflow is accelerated in the channel, and the outlet velocity increases. At the same time, the pressure at the inlet is slightly lower than that of the straight pipe, which further enhances the suction capacity.

[0038] The honeycomb baffle 7 reduces noise, prevents foreign objects from entering, and enhances structural strength: The honeycomb baffle 7 is installed inside the upper end of the air outlet duct 5 to disperse the concentrated airflow into multiple small airflows, effectively reducing airflow noise; at the same time, the honeycomb holes can block leaves, insects and other debris from falling into the chimney and prevent blockage; in addition, the baffle 7 also plays a structural support role, enhancing the stability of the air outlet duct 5.

[0039] Side-mounted diffused air intake and sloping drainage 8 enhance environmental adaptability: The air intake 6 is arranged in a multi-hole pattern on the side of the heat sink 2, with each small opening generating a low-velocity diffused airflow. Combined with the internal vertical heat sink fin structure 3, this allows the cooling air to be distributed more evenly between the heat sink fins 3. The bottom of the air intake 6 is a sloping surface 8 facing outwards, which facilitates the smooth flow of rainwater from the top of the lamp body 1 out of the receiving cavity 4, preventing water accumulation, corrosion, or impaired heat dissipation.

[0040] In the description of this specification, the terms "in one embodiment," "preferred," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. The connection methods linked in the description of this specification have significant effects and practical utility.

[0041] Based on the above description of the structure and principles, those skilled in the art should understand that this application is not limited to the specific embodiments described above. Improvements and substitutions made using techniques known in the art based on this application all fall within the protection scope of this application and should be defined by the claims.

Claims

1. An LED street light that enhances natural convection, characterized in that, include: The lamp body and the heat sink are provided. The top of the lamp body is provided with heat dissipation fins. The heat sink is located on the top of the lamp body and forms a cavity with the top of the lamp body to accommodate the heat dissipation fins. The top of the heat sink is provided with an air outlet channel. The side of the heat sink is provided with an air inlet. The air inlet, the cavity and the air outlet channel form a chimney air outlet structure to dissipate heat from the heat dissipation fins. The upper end of the air outlet channel is cylindrical and the lower end of the air outlet channel is a funnel-shaped structure that is wider at the bottom and narrower at the top. The bottom surface of the air inlet is an outward-facing slope.

2. The LED street light that enhances natural convection according to claim 1, characterized in that, A honeycomb-shaped guide plate is provided at the upper end of the air outlet duct.

3. The LED street light that enhances natural convection according to claim 1, characterized in that, The air inlets are arranged on the side of the heat sink.

4. The LED street light that enhances natural convection according to claim 1, characterized in that, The top edge of the lamp body is provided with studs for mounting screws, and the bottom of the heat sink extends outward to form a support strip, which is provided with placement holes for placing studs.

5. The LED street light that enhances natural convection according to claim 4, characterized in that, The top of the lamp body is provided with a protrusion, and one side of the top of the heat sink is provided with a notch that matches the protrusion. When the notch fits into the protrusion, the receiving cavity is closed by the side of the protrusion.

6. The LED street light that enhances natural convection according to claim 1, characterized in that, The heat dissipation fins are provided with slots.

Images