A combined heat sink for LED downlight

Abstract

The utility model discloses a combined heat sink for LED down lamp, the casing in the device sets up at the end of LED down lamp, the LED down lamp top is provided with the heating part, and the heat conduction sheet is closely combined with the heating part, the honeycomb hole equidistance array is opened in the inside of heat conduction sheet, and the inside of honeycomb hole is filled with cooling liquid, and the bottom of honeycomb hole is arc recess design, and the cooling liquid fills the bottom of honeycomb hole, the condensing pipe sets up at the top of honeycomb hole, and the condensing pipe communicates with honeycomb hole, and the device forms independent heat dissipation cavity through array honeycomb hole design, and cooperates the arc recess structure of honeycomb hole bottom, and even if LED down lamp is installed obliquely, the cooling liquid in each honeycomb hole can still cover the bottom area under the action of gravity all the time, solves the dry burning problem caused by the whole cavity cooling liquid deviation, avoids the local high heat of LED down lamp, satisfies the user's demand.

Description

Technical Field

[0001] This utility model relates to the technical field of heat dissipation components for LED downlights, and in particular to a combined heat sink for LED downlights. Background Technology

[0002] To address the heat generation issue, existing LED downlights often employ a combined heat sink. The core heat dissipation principle involves direct contact between the coolant and the heat-generating end of the LED downlight. After absorbing the heat generated by the heat-generating end, the coolant heats up and vaporizes. The vaporized coolant releases heat as it flows through the condenser pipe, then re-liquefies to form liquid coolant, thereby achieving cyclic cooling of the LED downlight and ensuring its stable operation.

[0003] However, most existing coolant cooling devices adopt an integrated cavity design, with coolant filling a single cavity. But in actual applications, some LED downlights are not installed horizontally and are tilted to some extent. This tilt causes the coolant in the cavity to shift to one side, resulting in dry burning in the area at the bottom of the cooling device that is far from the coolant. This leads to localized high heat in the corresponding area of ​​the LED downlight, which has limitations.

[0004] The reason for this problem is that the integral cavity has no partition structure. Under the action of gravity, the coolant will flow completely in the tilt direction and cannot be evenly distributed at the bottom of the cavity. When there is no coolant covering in a local area at the bottom, the heat cannot be dissipated through the conduction of the coolant and can only accumulate in that area, causing the local temperature to rise continuously and forming a dry burning phenomenon. Long-term dry burning will cause safety hazards such as damage to LED beads and aging of circuits, which has limitations. Utility Model Content

[0005] The purpose of this invention is to provide a combined heat sink for LED downlights to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a combined heat sink for LED downlights, comprising a housing, heat-conducting sheets, honeycomb holes, and a condenser tube; The housing is located at the end of the LED downlight; a heating element is located on the top of the LED downlight, and the heat-conducting sheet is tightly fitted to the heating element; a honeycomb array of equally spaced holes is formed inside the heat-conducting sheet, the inside of the honeycomb holes is filled with coolant, and the bottom of the honeycomb holes has an arc-shaped concave design, with the coolant filling the bottom of the honeycomb holes; a condenser tube is located on the top of the honeycomb holes, and the condenser tube communicates with the honeycomb holes, and the condenser tube is used to re-liquefy the heated and vaporized coolant.

[0007] Preferably, the coolant filling the honeycomb holes occupies two-thirds of the entire internal space of the honeycomb holes.

[0008] Preferably, fins are fixedly installed on the outer surface of the shell, the fins are arranged in a ring array, and the ends of the fins abut against the condenser tube.

[0009] Preferably, a heat sink is fixedly installed on the condenser tube, and the heat sink is fixedly installed to the housing.

[0010] Preferably, a sealing plate is fixedly installed on the top of the honeycomb holes, and a gas guide pipe is fixedly installed inside the sealing plate, the gas guide pipe being connected to the condenser pipe.

[0011] Preferably, a collection hopper is fixedly installed at the bottom of the condenser tube, and the inner wall of the collection hopper is tightly fitted with the gas guide tube.

[0012] Preferably, a liquid guide pipe is fixedly installed inside the collection hopper, the liquid guide pipe is in communication with the collection hopper, the liquid guide pipe is distributed in a ring array, and the bottom of the liquid guide pipe is located below the surface of the coolant.

[0013] The technical effects and advantages of this utility model are as follows: This device forms an independent heat dissipation cavity through an array honeycomb hole design. Combined with the arc-shaped concave structure at the bottom of the honeycomb hole, even if the LED downlight is installed at an angle, the coolant in each honeycomb hole can always cover the bottom area under the action of gravity. This solves the problem of dry burning caused by the displacement of coolant in the integral cavity, avoids local high heat in the LED downlight, and meets the needs of users. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the top of the casing of this utility model; Figure 3 This is a schematic diagram of the heat-conducting sheet of this utility model; Figure 4 This is a schematic diagram of the internal structure of the condenser tube of this utility model; Figure 5 This is a schematic diagram of the air duct of this utility model.

[0015] In the diagram: 1. Shell; 2. Heat-conducting fin; 22. Honeycomb opening; 23. Condenser tube; 24. Fin; 25. Heat sink; 26. Gas duct; 27. Collection hopper; 28. Liquid duct. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] This utility model provides, for example Figures 1 to 2 The illustrated combined heat sink for LED downlights includes a housing 1, a heat-conducting plate 2, a honeycomb hole 22, and a condenser tube 23. The housing 1 is located at the end of the LED downlight; a heating element is located on the top of the LED downlight, and the heat-conducting plate 2 is tightly attached to the heating element; honeycomb holes 22 are equidistantly arrayed inside the heat-conducting plate 2, and the inside of the honeycomb holes 22 is filled with coolant. The bottom of the honeycomb holes 22 has an arc-shaped concave design, and the coolant fills the bottom of the honeycomb holes 22; a condenser tube 23 is located on the top of the honeycomb holes 22 and is connected to the honeycomb holes 22. The condenser tube 23 is used to re-liquefy the heated and vaporized coolant.

[0018] Example 1: In this example, when the LED downlight is working, the heat generated by the heating element is conducted to the heat-conducting plate 2 through the thermal grease. The heat-conducting plate 2 transfers the heat to the coolant in each honeycomb hole 22. After absorbing the heat, the coolant heats up and vaporizes to form coolant vapor. The vapor enters the condenser tube 23 through the vent pipe 26. With the auxiliary heat dissipation of the heat sink 25 and fins 24, the condenser tube 23 causes the vapor to release heat and liquefy to form liquid coolant. The liquid coolant flows into the collection hopper 27 under the action of gravity, and then flows back to the honeycomb hole 22 through the liquid guide pipe 28 to continue absorbing heat and complete the cycle of heat dissipation. When the LED downlight is installed at an angle, the coolant in each honeycomb hole 22 always covers the bottom area under the action of the arc bottom, avoiding dry burning caused by the heating element coming into contact with the area without coolant, and ensuring stable heat dissipation.

[0019] like Figures 3 to 5 The illustrated combined heat sink for LED downlights includes a housing 1, a heat-conducting plate 2, a honeycomb hole 22, and a condenser tube 23. The housing 1 is located at the end of the LED downlight; a heating element is located on the top of the LED downlight, and the heat-conducting plate 2 is tightly attached to the heating element; honeycomb holes 22 are equidistantly arrayed inside the heat-conducting plate 2, and the inside of the honeycomb holes 22 is filled with coolant. The bottom of the honeycomb holes 22 has an arc-shaped concave design, and the coolant fills the bottom of the honeycomb holes 22; a condenser tube 23 is located on the top of the honeycomb holes 22 and is connected to the honeycomb holes 22. The condenser tube 23 is used to re-liquefy the heated and vaporized coolant.

[0020] The coolant filling the honeycomb aperture 22 occupies two-thirds of the entire internal space of the honeycomb aperture 22.

[0021] Fins 24 are fixedly installed on the outer surface of the shell 1. The fins 24 are arranged in a ring array and the ends of the fins 24 abut against the condenser tube 23.

[0022] A heat sink 25 is fixedly installed on the condenser tube 23, and the heat sink 25 is fixedly installed on the housing 1.

[0023] A sealing plate is fixedly installed on the top of the honeycomb hole 22, and a gas guide pipe 26 is fixedly installed inside the sealing plate. The gas guide pipe 26 is connected to the condenser pipe 23.

[0024] A collection hopper 27 is fixedly installed at the bottom of the condenser tube 23, and the inner wall of the collection hopper 27 is tightly fitted with the air guide tube 26.

[0025] A liquid guide pipe 28 is fixedly installed inside the collection hopper 27. The liquid guide pipe 28 is connected to the collection hopper 27 and is arranged in a ring array. The bottom of the liquid guide pipe 28 is located below the surface of the coolant.

[0026] Example 2: In this example, it should be noted that the honeycomb hole 22 design of this application is only for slight tilting during the installation of LED downlights, and will not result in the entire LED downlight being installed upside down. Moreover, the tilt angle will not be too large, and will not cause the coolant to block the exhaust port of the air duct 26. The heat-conducting sheet 2 is made of copper, which has high thermal conductivity. Its bottom is tightly attached to the heating part at the top of the LED downlight with thermal grease. The honeycomb holes 22 are equidistantly arrayed inside the heat-conducting sheet 2. The bottom of each honeycomb hole 22 adopts an arc-shaped concave design. The honeycomb holes 22 are filled with ethanol coolant. The coolant filling volume is two-thirds of the internal space of the honeycomb holes 22. As long as the tilt angle of the LED downlight does not exceed 30°, the coolant can be kept covered by the limiting effect of the arc-shaped bottom to avoid the bottom being exposed. A sealing plate is fixedly installed on the top of the honeycomb hole 22 to prevent coolant vapor leakage. A vent pipe 26 is fixedly installed on the sealing plate at the position of each honeycomb hole 22. The vent pipe 26 is a high-temperature resistant silicone tube, and its upper end is connected to the condenser tube 23. The condenser tube 23 is made of copper tube, and a heat sink 25 is fixedly installed on its outer wall. The heat sink 25 is a thin aluminum alloy sheet. The heat sink 25 can quickly conduct heat in the condenser tube 23 to the shell 1. The outer surface of the shell 1 is integrally formed with fins 24. The fins 24 are distributed in a ring array. The end of each fin 24 abuts against the outer wall of the condenser tube 23, further accelerating the heat dissipation of the condenser tube 23 and improving the steam liquefaction efficiency. The collecting hopper 27 is funnel-shaped, with its inner wall tightly fitted to the outer wall of the air guide pipe 26. This allows for the centralized collection of the liquefied coolant in the condenser tube 23, preventing coolant from dripping down the outer wall of the air guide pipe 26. A liquid guide pipe 28 is fixedly installed at the bottom of the collecting hopper 27. The liquid guide pipe 28 is a rigid plastic tube arranged in a ring array. Its lower end penetrates the sealing plate and extends into the honeycomb holes 22. The bottom of the liquid guide pipe 28 is below the coolant surface, ensuring that the liquefied coolant can flow smoothly back into the honeycomb holes 22, achieving circulating heat dissipation.

[0027] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A combined heat sink for LED downlights, characterized in that, include: Housing (1), said housing (1) is disposed at the end of the LED downlight; Heat-conducting sheet (2), the top of the LED downlight is provided with a heating element, and the heat-conducting sheet (2) is closely attached to the heating element; Honeycomb holes (22) are equidistantly arrayed inside the heat-conducting plate (2). The honeycomb holes (22) are filled with coolant. The bottom of the honeycomb holes (22) is an arc-shaped concave design. The coolant fills the bottom of the honeycomb holes (22). A condenser tube (23) is disposed at the top of the honeycomb hole (22) and is connected to the honeycomb hole (22). The condenser tube (23) is used to reliquefy the heated and vaporized coolant.

2. A combined heat sink for LED downlights according to claim 1, characterized in that, The coolant filling the honeycomb hole (22) occupies two-thirds of the entire internal space of the honeycomb hole (22).

3. A combined heat sink for LED downlights according to claim 1, characterized in that, Fins (24) are fixedly installed on the outer surface of the shell (1). The fins (24) are arranged in a ring array and the ends of the fins (24) abut against the condenser tube (23).

4. A combined heat sink for LED downlights according to claim 1, characterized in that, A heat sink (25) is fixedly installed on the condenser tube (23), and the heat sink (25) is fixedly installed on the shell (1).

5. A combined heat sink for LED downlights according to claim 1, characterized in that, A sealing plate is fixedly installed on the top of the honeycomb hole (22), and a gas guide pipe (26) is fixedly installed inside the sealing plate. The gas guide pipe (26) is connected to the condenser pipe (23).

6. A combined heat sink for LED downlights according to claim 5, characterized in that, A collection hopper (27) is fixedly installed at the bottom of the condenser tube (23), and the inner wall of the collection hopper (27) is tightly fitted with the gas guide tube (26).

7. A combined heat sink for LED downlights according to claim 6, characterized in that, The collection hopper (27) is fixedly installed with a liquid guide pipe (28), which is connected to the collection hopper (27). The liquid guide pipe (28) is arranged in a ring array, and the bottom of the liquid guide pipe (28) is located below the surface of the coolant.

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