CN106439756A - S-shaped loop heat pipe radiator for LED - Google Patents

Abstract

The present invention provides an LED serpentine loop heat pipe radiator, comprising: an evaporator, the bottom of which is connected to an LED chip, and the evaporation chamber of the evaporator is filled with a heat-exchanging working medium; it also includes a serpentine loop heat pipe, One end of the serpentine loop heat pipe is connected to the steam outlet end of the evaporation chamber through a connecting pipe, and the other end of the serpentine loop heat pipe is connected to the liquid return port of the evaporation chamber through a return pipe. The evaporation chamber of the evaporator and the serpentine loop heat pipe A closed heat pipe loop is formed by connecting the connection pipe with the return pipe; it also includes corrugated aluminum heat dissipation fins, and the corrugated aluminum heat dissipation fins are provided with through holes, and the serpentine loop heat pipes are closely combined with the corrugated aluminum heat dissipation fins through the through holes. The LED serpentine loop heat pipe radiator conducts heat transfer through the reciprocating phase change of the heat exchange working medium in the closed heat pipe circuit, making full use of the latent heat of vaporization of the heat exchange working medium during the phase change process, and strengthening the structure of the corrugated aluminum heat dissipation fins Heat dissipation, to achieve efficient conduction and heat dissipation of high heat flow of LED chips.

Description

A LED serpentine loop heat pipe radiator

technical field

The invention belongs to the technical field of heat exchange or heat exchange equipment, and in particular relates to an LED serpentine loop heat pipe radiator.

Background technique

The invention of LED lights has become the most valuable new type of lighting in the 21st century due to its good light source characteristics, environmental protection, long life, and energy saving. It is widely used in various fields involved in general lighting, and is gradually replacing ordinary light sources and becoming the mainstream. At present, the manufacture of high-power LED chips is developing towards high performance, integration and miniaturization. When it is working, about 80% of the electric energy is converted into heat and emitted, and only 20% is converted into light energy. Up to 100W/cm ² . Such a high heat flux seriously affects the service life and light quality of the LED. Therefore it becomes a very urgent task to invent a good heat sink for high-power LED lamps. At present, the heat dissipation effect of simple aluminum radiators on the market cannot meet the needs of high-power LEDs; fan-forced air-cooled LED lights not only increase energy consumption, but also slow the speed of heat dissipation through air convection, and the failure rate of fans is greater than that of LEDs. The life cycle is short, and the later maintenance costs are high.

The Chinese invention patent with the authorized announcement number CN204164705U discloses "an LED lamp with a serpentine loop heat pipe radiator". , indicating that the heat dissipation function of the serpentine heat pipe itself is saturated. The temperature sensor is connected to the motor of the heat dissipation fan through a wire, and the heat dissipation fan rotates in the opposite direction, attracting outside air to quickly enter the heat dissipation cavity to take away the heat generated by the serpentine heat dissipation pipe. To ensure the normal operation of the LED, the temperature sensor controls the cooling fan not to start when the heat dissipation function of the serpentine heat pipe is not saturated, which indirectly reduces the overall power consumption of the lamp. This patent controls the opening and closing of the cooling fan and uses air convection to achieve heat dissipation. Although the overall power consumption of the lamp is reduced, the failure rate of the fan is high, and the heat generated by the LED lamp cannot be quickly taken away by air convection heat dissipation. Heat dissipation has a certain hysteresis, especially not suitable for LED lamps that may generate a large amount of heat instantaneously.

The Chinese patent application with the publication number CN104582423A proposes "a kind of LED panel water-cooling heat dissipation seat". The heat dissipation is realized through the water-cooling heat pipe, and the water-cooling heat pipe realizes the water circulation through the water pump, and the constant water temperature is ensured through the heat sink. However, the water-cooled heat sink needs to use a circulation pump. Although the heat dissipation effect is good, the heat dissipation speed is slow, the energy consumption is high, and the structure is complicated, so it is not easy to popularize.

Contents of the invention

Aiming at the deficiencies of the prior art, the present invention provides an LED serpentine loop heat pipe radiator, which can accelerate the dissipation of heat generated by high-power LED lamps through the rapid circulation of heat-exchanging working fluid.

In order to realize the above-mentioned technical solution, the present invention provides an LED serpentine loop heat pipe radiator, comprising: an evaporator, the bottom of which is connected to the LED chip, and the evaporation cavity of the evaporator is filled with a heat exchange tool. It also includes a serpentine loop heat pipe, one end of the serpentine loop heat pipe is connected to the steam outlet end of the evaporation cavity in the evaporator through a connecting pipe, and the other end of the serpentine loop heat pipe is connected to the evaporator through a return pipe. The liquid return port of the chamber, the evaporation chamber of the evaporator is connected with the serpentine loop heat pipe through the connecting pipe and the return pipe to form a closed heat pipe circuit; it also includes corrugated aluminum heat dissipation fins, and the corrugated aluminum heat dissipation fins are provided with Through holes, serpentine loop heat pipes are tightly combined with corrugated aluminum cooling fins through through holes.

When the radiator works normally, the heat exchange working medium filled in the evaporation chamber absorbs the heat generated by the LED chip and then vaporizes rapidly. The serpentine loop heat pipe exchanges heat with the corrugated aluminum cooling fins. After heat exchange, the heat-exchange working medium is condensed into a liquid state and returned to the evaporation chamber through the return pipe, realizing the recycling of the heat-exchange working medium. Since the heat exchange medium in the evaporation chamber can quickly absorb the heat generated by the LED chip, no matter how much heat the LED chip can generate in an instant, it can be quickly absorbed by the heat exchange medium through the phase change heat, preventing the heat loss of the LED chip Gather to ensure the normal operation of LED lamps.

Preferably, the bottom end of the evaporator is connected with two or more closed heat pipe loops arranged side by side and spaced apart. The circulation of multiple heat pipe loops can enhance the absorption speed of the heat exchange medium to the heat generated by the LED chip, and accelerate the heat dissipation rate.

Preferably, the evaporation cavity on the evaporator is set in a square or oval shape, the evaporation cavity includes a metal tube and a heat-taking body, the heat-taking body is directly connected to the LED chip, and the metal tube is embedded in the heat-taking body, The two ends of the metal pipe are directly welded to the connection pipe and the return pipe respectively, and the heat exchange working medium is filled in the metal pipe. As a high-efficiency heat-conducting device, the heat-taking body can be made of copper or alloy aluminum into a sheet or block with grooves. The heat-taking body can quickly absorb the instantaneous heat generated in the LED chip and transfer it to the metal tube, inside the metal tube The heat exchange working medium is instantly vaporized, then enters the serpentine loop heat pipe through the connecting pipe for heat exchange, and then enters the metal pipe through the return pipe to achieve efficient circulation and heat dissipation.

Preferably, the evaporation chamber on the evaporator includes a heat-taking body made of copper or aluminum alloy, the heat-taking body is directly connected to the LED chip, and square or oval channels are milled on the side of the heat-taking body. A heat-absorbing core is arranged in the channel and filled with a heat-exchanging working medium, and the two ends of the channel for taking the heat body are directly welded to the connecting pipe and the return pipe respectively. In order to realize the vaporization of the heat exchange medium more efficiently, square, oval, and circular channels can be directly milled inside the heat-absorbing body, and the heat-exchange medium is directly filled in the channel, and the heat-absorbing core gathers the heat-absorbing body to generate The heat makes the heat-absorbing core absorb the heat generated by the LED chip and quickly reach the boiling point of the heat-exchanging medium, realizing the instantaneous vaporization of the heat-exchanging medium, so that the instantaneous heat generated by the LED chip can be quickly discharged, especially suitable for high-power LED lamps Protection of LED chips when starting or short circuit occurs.

Preferably, the bottom end of the evaporator and the LED chip are tightly bonded by heat-conducting silicone grease, low-temperature metal sheet or low-temperature solder paste. In this way, the air thermal resistance between the LED chip and the bottom of the evaporator can be reduced, and the heat transfer efficiency between the LED chip and the evaporator can be improved.

Preferably, the serpentine loop heat pipe and the corrugated aluminum heat dissipation fins are fixed by riveting or welding. The heat transfer between the serpentine loop heat pipe and the corrugated aluminum heat dissipation fins is through direct contact such as riveting or welding, which can reduce the air thermal resistance between the serpentine loop heat pipe and the corrugated aluminum heat dissipation fins, and realize rapid heat transfer.

Preferably, the serpentine loop heat pipe, connection pipe and return pipe are all made of red copper or aluminum alloy. The heat transfer efficiency of the entire heat pipe circuit can be enhanced by copper or aluminum alloy materials, which are high thermal conductivity metals.

The beneficial effects of the LED serpentine loop heat pipe radiator provided by the present invention are:

(1) The structure of the LED serpentine loop heat pipe radiator is simple, easy to install, and easy to realize. It conducts heat transfer through the reciprocating phase change of the heat exchange working medium in the closed heat pipe circuit, and makes full use of the heat exchange working medium in the phase change process. The latent heat of vaporization, and the corrugated aluminum fin structure is used to strengthen the heat dissipation, and finally realize the efficient conduction and heat dissipation of the high heat flow of the LED chip, and effectively control the junction temperature of the LED chip;

(2) The evaporation cavity in the LED serpentine loop heat pipe radiator adopts the combination mode of the heat-taking body and the metal pipe, or directly mills a square, oval, and circular channel on the body of the heat-taking body, and then arranges the suction in the channel. The hot core mode can realize the instantaneous vaporization of the heat exchange medium, so that the instantaneous heat generated by the LED chip can be quickly discharged, especially suitable for the protection of the LED chip when the high-power LED lamp is started or a short circuit occurs;

(3) The bottom of the evaporator in the LED serpentine loop heat pipe radiator and the LED chip are tightly bonded by thermal conductive silicone grease, low-temperature metal sheet or low-temperature solder paste, so that the distance between the LED chip and the evaporator can be reduced. The air thermal resistance between the bottom ends improves the heat transfer efficiency between the LED chip and the evaporator.

(4) In the LED serpentine loop heat pipe radiator, the serpentine loop heat pipe and the corrugated aluminum heat dissipation fins conduct heat through direct contact such as riveting or welding, which can reduce the gap between the serpentine loop heat pipe and the corrugated aluminum heat dissipation fins. The air thermal resistance between them realizes the rapid transfer of heat.

(5) Compared with the traditional use of a single heat pipe and the traditional loop heat pipe, this LED serpentine loop heat pipe radiator has a relatively longer path of the serpentine loop heat pipe, a larger contact area with the fins, and a higher probability of contact between the heat pipe and the fins. increase, high fin utilization rate, enlarged effective heat dissipation area, and improved heat dissipation efficiency; compared with traditional loop heat pipes with the same effect, this radiator is smaller in size and lighter in weight, effectively reducing the volume and weight.

Description of drawings

Fig. 1 is the front view of the present invention.

Figure 2 is a side view of the present invention.

Fig. 3 is the structural diagram I of the heat-taking body in the embodiment.

Fig. 4 is the structural diagram II of the heat-taking body in the embodiment.

In the figure: 1. LED chip; 2. evaporator; 3. connecting pipe; 4. serpentine loop heat pipe; 5. return pipe; 6. corrugated aluminum cooling fin; 7. through hole;

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. All other embodiments obtained by ordinary persons in the art without creative efforts belong to the protection scope of the present invention.

Embodiment: a kind of LED serpentine loop heat pipe radiator.

Referring to Fig. 1 and Fig. 2, an LED serpentine loop heat pipe radiator includes: an evaporator 2, the bottom of which is connected to the LED chip 1, and the evaporation chamber of the evaporator 2 is filled with Heat exchange working fluid, in order to realize rapid vaporization of heat exchange working medium, heat exchange working medium can use single-component pure substances, such as: alcohols, acetone, alkanes, freon, etc.; can also use the above-mentioned single-component pure substances to prepare The binary mixed working fluid; also includes a serpentine loop heat pipe 4, one end of the serpentine loop heat pipe 4 is connected to the steam outlet end of the evaporation chamber in the evaporator 2 through a connecting pipe 3, and the serpentine loop heat pipe The other end of 4 is connected to the liquid return port of the evaporation chamber through the return pipe 5, and the evaporation chamber of the evaporator 2 and the serpentine loop heat pipe 4 are connected to the return pipe 5 through the connecting pipe 3 to form a closed heat pipe loop; Corrugated aluminum heat dissipation fins 6, the corrugated aluminum heat dissipation fins 6 are provided with through holes 7, the serpentine loop heat pipe 4 is closely combined with the corrugated aluminum heat dissipation fins 6 through the through holes 7, and the through holes 7 are added with serpentine loops The contact area between the heat pipe 4 and the corrugated aluminum heat dissipation fin 6 can accelerate the heat transfer efficiency between the serpentine loop heat pipe 4 and the corrugated aluminum heat dissipation fin 6 .

The working principle of the radiator is as follows: the heat exchange fluid filled in the evaporation chamber absorbs the heat generated by the LED chip 1 and then vaporizes rapidly. The vaporized heat exchange fluid enters the serpentine loop heat pipe 4 through the connecting pipe 3, and the gas The heat exchange working medium exchanges heat with the corrugated aluminum heat dissipation fins 6 in the serpentine loop heat pipe 4, and the heat exchange working medium recondenses into a liquid state after heat exchange and returns to the evaporation chamber through the return pipe 5, realizing Recycling of heat exchange working fluid. Since the heat exchange medium in the evaporation chamber can quickly absorb the heat generated by the LED chip 1, no matter how much heat the LED chip 1 can generate in an instant, it can be quickly absorbed by the heat exchange medium through the phase change heat, preventing the LED chip from 1. The accumulation of heat ensures the normal operation of LED lamps. At the same time, the heat transfer is carried out through the reciprocating phase change of the heat exchange medium in the closed heat pipe circuit, making full use of the latent heat of vaporization of the heat exchange medium during the phase change process, and using the corrugated aluminum heat dissipation fin 6 structure to enhance heat dissipation, and finally realize the LED chip 1 Efficient conduction and heat dissipation of high heat flow, effectively controlling the junction temperature of the LED chip 1.

Referring to Figure 2, in order to enhance the absorption rate of the heat generated by the heat-exchange working medium on the LED chip 1 and accelerate the rate of heat dissipation, two or more closed heat pipe circuits are arranged at the bottom of the evaporator 2 and distributed side by side at intervals. . The circulation of multiple heat pipe loops enhances the absorption speed of the heat exchange working fluid to the heat generated by the LED chip 1 .

In this embodiment, the evaporation cavity on the evaporator 2 is set in an oval shape, and the evaporation cavity includes a metal tube and a heat-taking body, the metal tube is made of aluminum alloy, and the heat-taking body is directly connected to the LED chip 1 Connection, the metal tube is embedded in the heat-taking body, the two ends of the metal tube are directly welded to the connecting tube 3 and the return tube 5 respectively, and the heat-exchanging working medium is filled in the metal tube. The heat-taking body 21 is a high-efficiency heat-conducting device, which can be made of copper or alloy aluminum into a thin sheet or block with grooves. The heat-taking body can quickly absorb the instantaneous heat generated in the LED chip 1 and transfer it to the metal tube. The heat exchange medium in the metal tube is instantly vaporized, then enters the serpentine loop heat pipe 4 through the connecting pipe 3 for heat exchange, and then enters the metal pipe through the return pipe 5 to realize efficient circulation and heat dissipation.

Another implementation of this embodiment is that the evaporation chamber on the evaporator 2 includes a heat-taking body made of copper, the heat-taking body is directly connected to the LED chip 1, and the side of the heat-taking body is milled with an oval channel , the heat absorbing core is arranged in the channel and filled with heat exchanging fluid, and the two ends of the heat-taking channel are directly welded to the connecting pipe 3 and the return pipe 5 respectively. In order to more efficiently realize the vaporization of the heat-exchanging medium, square or oval channels are directly milled inside the heat-absorbing body, and the heat-exchanging medium is directly filled in the channel, and the heat generated by the heat-absorbing body is accumulated through the heat-absorbing core, so that The heat-absorbing core absorbs the heat generated by the LED chip 1 and quickly reaches the boiling point of the heat-exchanging medium, realizing the instantaneous vaporization of the heat-exchanging medium, so that the instantaneous heat generated by the LED chip 1 can be quickly discharged, especially suitable for high-power LED lights. Protection of LED chip in case of short circuit.

In this embodiment, the bottom end of the evaporator 2 is tightly bonded to the LED chip 1 through a low-temperature metal sheet or low-temperature solder paste. The interface between the bottom of the evaporator 2 and the LED chip 1 generally adopts a plane structure interface. In order to ensure good contact between the two planes, the air is removed (the large air thermal resistance seriously affects heat conduction). Traditional LED lamps usually use heat-conducting silica gel here, but this type The thermal conductivity of the material itself is low, generally not exceeding 5W/m·K (the thermal conductivity of pure copper is 400W/m·K, and the thermal conductivity of pure aluminum is 230W/m·K). In this embodiment, conventional metal materials are selected here for coating filling. Various low-temperature solder pastes can be used, and low-temperature metal materials can also be selected, such as multi-element metal materials containing tin, strontium, bismuth, indium and other metal elements. This material has a large thermal conductivity, has fluidity at room temperature, can penetrate into very fine spaces, can be used to reduce the contact thermal resistance between two different materials, and can reduce the bottom of the LED chip 1 and the evaporator 2 The air thermal resistance between them improves the heat transfer efficiency between the LED chip 1 and the evaporator 2

In this embodiment, the serpentine loop heat pipe 4 and the corrugated aluminum heat dissipation fin 6 are fixed by riveting or welding. The serpentine loop heat pipe 4 and the corrugated aluminum heat dissipation fin 6 conduct heat through direct contact such as riveting or welding, which can reduce the air thermal resistance between the serpentine loop heat pipe 4 and the corrugated aluminum heat dissipation fin 6, and realize heat dissipation. Fast delivery.

In this embodiment, the serpentine loop heat pipe 4 , connecting pipe 3 and return pipe 5 are all made of red copper or aluminum alloy. The heat transfer efficiency of the entire heat pipe circuit can be enhanced by copper or aluminum alloy materials, which are high thermal conductivity metals.

The above description is only a preferred embodiment of the present invention, but the present invention should not be limited to the content disclosed in this embodiment and the accompanying drawings, for example, it can also be made that the installation direction of the heat pipe and the installation direction of the aluminum pipe are set at a certain angle, and The heat pipe is installed in both horizontal and vertical ways, so any equivalent or modification that does not deviate from the spirit disclosed in the present invention falls within the protection scope of the present invention.

Claims (7)

1. the snakelike loop heat pipe radiator of a kind of LED, it is characterised in that include：

Vaporizer (2), the bottom of vaporizer (2) is connected with LED chip, and the evaporation intracavity filling of vaporizer (2) is changed Hot working fluid；

Snakelike loop circuit heat pipe (4), the one end of snakelike loop circuit heat pipe (4) is by connecting tube (3) and the interior evaporation cavity of vaporizer (2) The connection of steam (vapor) outlet end, the other end of snakelike loop circuit heat pipe (4) is connected to the liquid of evaporation cavity by return duct (5) Return port, the evaporation cavity of vaporizer (2) is connected shape by connecting tube (3) with return duct (5) with snakelike loop circuit heat pipe (4) Become the heat pipe circuit of a closure；

Corrugated aluminium radiating fin (6), is provided with through hole (7), snakelike loop circuit heat pipe (5) on corrugated aluminium radiating fin (6) Combined closely with corrugated aluminium radiating fin (6) by through hole (7).

2. the snakelike loop heat pipe radiator of LED as claimed in claim 1, it is characterised in that：The bottom of vaporizer (2) is even It is connected to the closure heat pipe circuit of the spacing side by side distribution of two or more than two.

3. the snakelike loop heat pipe radiator of LED as claimed in claim 1, it is characterised in that：Evaporation on vaporizer (2) Chamber is set to square or oval, and the evaporation cavity includes metal tube and takes hot body, described takes hot body (21) directly and LED core Piece connects, and metal tube is embedded in and takes in hot body, and the two ends of metal tube are directly welded with connecting tube (3) and return duct (5) respectively, change Hot working fluid is filled in metal tube.

4. the snakelike loop heat pipe radiator of LED as claimed in claim 1, it is characterised in that：Evaporation on vaporizer (2) What chamber included a red copper or aluminum alloy material takes hot body (21), described take hot body and be directly connected with LED chip, take hot body Side milling has square or oval, circular passage, arranges heat exchanger core and fills heat-exchange working medium, take hot body in the passage The two ends of passage are directly welded with connecting tube (3) and return duct (5) respectively.

5. the snakelike loop heat pipe radiator of LED as claimed in claim 1, it is characterised in that：The bottom of vaporizer (2) with Fitted tightly by heat-conducting silicone grease, low-temperature metal piece or low temperature tin cream between LED chip.

6. the snakelike loop heat pipe radiator of LED as claimed in claim 1, it is characterised in that：The snakelike loop circuit heat pipe and ripple By riveting or being welded and fixed between stricture of vagina aluminum radiating fin.

7. the snakelike loop heat pipe radiator of LED as claimed in claim 1, it is characterised in that：Snakelike loop circuit heat pipe (4), Connecting tube (3) and return duct (5) are all using red copper or aluminum alloy material.