CN108332174A - A kind of cooling system and method applied to high-power LED (light emitting diode) lighting equipment light-emitting surface - Google Patents

Abstract

The invention belongs to the field of heat dissipation technology, and discloses a heat dissipation system and method applied to the light-emitting surface of high-power LED lighting equipment. The hydrogel is spread on the light-emitting surface of the LED lighting equipment, and the water contained in the water gel is evaporated. The water takes away the heat of the LED lighting equipment in time, and after the water in the hydrogel evaporates continuously, the hydrogel is replenished with water through the water replenishing device. The invention solves the problems in the prior art that the LED device system is huge, the working temperature is high, and heat dissipation can only be performed on the backlight surface of the LED.

Description

A heat dissipation system and method applied to the light-emitting surface of high-power LED lighting equipment

technical field

The invention relates to the technical field of heat dissipation, in particular to a heat dissipation system and method applied to the light-emitting surface of high-power LED lighting equipment.

Background technique

In recent years, with the continuous development of LED preparation technology and heat dissipation technology, LED has gradually replaced traditional light sources and become the current mainstream light source, widely used in construction, medical, military, aerospace and many other industries. Compared with traditional light sources (such as fluorescent lamps, metal halide lamps, and high-pressure mercury lamps), LEDs have the advantages of environmental protection and non-toxicity, high luminous efficiency, simple equipment, small size, and good adjustability. However, there are also some problems in the development of LEDs, the most prominent of which is heat dissipation. LED cooling methods can be divided into active cooling and passive cooling. Active cooling often uses auxiliary devices for forced cooling, such as air cooling, liquid cooling, and heat pipe cooling. Passive heat dissipation relies on heat conduction to dissipate heat. Using substrates with high thermal conductivity and thermal interface materials, using heat sinks, and rationally arranging LED chips can improve heat dissipation efficiency. However, all existing cooling devices inevitably have the disadvantages of large systems and high costs. In addition, limited by the efficacy of LED lighting, most heat dissipation equipment can only dissipate heat on its reflective surface, and cannot effectively dissipate heat from the LED lighting equipment as a whole, resulting in scorching heat on the light emitting surface of high-power LED lighting equipment, resulting in equipment burnout And other issues.

Contents of the invention

The embodiments of the present application provide a heat dissipation system and method applied to the light-emitting surface of high-power LED lighting equipment, which solves the problem in the prior art that the LED device system is huge, the working temperature is high, and heat dissipation can only be performed on the backlight surface of the LED.

The embodiment of the present application provides a heat dissipation system applied to the light-emitting surface of high-power LED lighting equipment, including: hydrogel and water replenishing device;

The hydrogel is covered on the light-emitting surface of the LED lighting equipment, and the water replenishment device communicates with the hydrogel. After the water in the hydrogel evaporates continuously, the water replenishment device Hydrate.

Preferably, the hydrogel is a double-chain hydrogel.

Preferably, the water replenishment device includes a water replenishment pipeline and a water replenishment container, the water replenishment pipeline is made of capillary material, and the two ends of the water replenishment pipeline communicate with the hydrogel and the water replenishment container respectively.

Preferably, the water supply device includes a water supply container, a water supply pipe, and an electric pump, the electric pump is arranged on the water supply pipe, and both ends of the water supply pipe communicate with the hydrogel and the water supply container respectively.

Preferably, the edge portion of the hydrogel is bonded to the light-emitting surface of the LED lighting device through thermally conductive silica gel.

The embodiment of the present application provides a heat dissipation method applied to the light-emitting surface of high-power LED lighting equipment. The hydrogel is spread on the light-emitting surface of the LED lighting equipment, and the water contained in the water gel is evaporated and taken away in time. The heat of the LED lighting equipment; after the water in the hydrogel is continuously evaporated, the hydrogel is replenished with water through a water replenishment device.

Preferably, the hydrogel is a double-chain hydrogel.

Preferably, the specific implementation method of spreading the hydrogel on the light-emitting surface of the LED lighting equipment is: making the hydrogel into a film to obtain a hydrogel film; the area of the hydrogel film is larger than The area of the light-emitting surface of the LED lighting equipment; the edge part of the hydrogel film and the light-emitting surface of the LED lighting equipment are bonded together through thermal conductive silica gel.

Preferably, the water replenishment device includes a water replenishment pipeline and a water replenishment container, the water replenishment pipeline is made of capillary material, and the two ends of the water replenishment pipeline communicate with the hydrogel and the water replenishment container respectively.

Preferably, the water supply device includes a water supply container, a water supply pipe, and an electric pump, the electric pump is arranged on the water supply pipe, and both ends of the water supply pipe communicate with the hydrogel and the water supply container respectively.

One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

In the embodiment of this application, the hydrogel is directly spread on the light-emitting surface of the high-power LED lighting equipment, and when the temperature of the equipment rises, the moisture contained in the hydrogel film is evaporated and the heat is taken away in time, and the temperature drop of the LED equipment is suppressed. keep rising. The present invention uses the active phase change heat transfer method to effectively realize heat dissipation, and the adopted hydrogel has good mechanical and thermal properties, high transparency, strong reusability, and can contain in its fully swollen state More than 90% of its weight in water. The invention replenishes water with the hydrogel, meets the long-time working requirements of the LED lighting equipment, does not consume electric energy compared with the traditional LED heat dissipation technology, and has very large energy-saving potential.

Description of drawings

In order to illustrate the technical solution in this embodiment more clearly, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are an embodiment of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without making creative efforts.

Fig. 1 is a schematic structural diagram of a heat dissipation system applied to the light-emitting surface of a high-power LED lighting device provided by an embodiment of the present invention;

Fig. 2 is an internal structure diagram of a double-chain hydrogel applied to a heat dissipation system on the light-emitting surface of a high-power LED lighting device provided by an embodiment of the present invention;

Fig. 3 is a curve diagram of an experiment effect of a heat dissipation method applied to a light-emitting surface of a high-power LED lighting device provided by an embodiment of the present invention.

Among them, 1-LED lighting equipment, 2-hydrogel, 3-hydration pipeline, 4-hydration container;

Calcium ion crosslinking in 5-alginate gels, covalent crosslinking of N,N'-methylenebisacrylamide in 6-polyacrylamide gels, carboxyl groups of 7-alginate chains and polyacrylamide Covalent crosslinks between the amine groups of the chain;

8-The temperature change curve of the LED device when the hydrogel is not applied, and 9-The temperature change curve of the LED device when the hydrogel is applied.

Detailed ways

The embodiments of the present application provide a heat dissipation system and method applied to the light-emitting surface of high-power LED lighting equipment, which solves the problem in the prior art that the LED device system is huge, the working temperature is high, and heat dissipation can only be performed on the backlight surface of the LED.

The technical solution of the embodiment of the present application is to solve the above-mentioned technical problems, and the general idea is as follows:

A heat dissipation system applied to the light-emitting surface of high-power LED lighting equipment, including: hydrogel, water replenishing device;

The hydrogel is covered on the light-emitting surface of the LED lighting equipment, and the water replenishment device communicates with the hydrogel. After the water in the hydrogel evaporates continuously, the water replenishment device Hydrate.

A heat dissipation method applied to the light-emitting surface of high-power LED lighting equipment. The hydrogel is spread on the light-emitting surface of the LED lighting equipment, and the water contained in the water gel is evaporated to take away the LED lighting equipment in time. heat; after the water in the hydrogel is continuously evaporated, the hydrogel is replenished with water through a water replenishment device.

In the present invention, the hydrogel is directly covered on the light-emitting surface of the high-power LED lighting equipment, and when the temperature of the equipment rises, the moisture contained in the hydrogel film is evaporated and the heat is taken away in time, thereby suppressing the continuous increase of the temperature of the LED equipment. The present invention uses the active phase change heat transfer method to effectively realize heat dissipation, and the adopted hydrogel has good mechanical and thermal properties, high transparency, strong reusability, and can contain in its fully swollen state More than 90% of its weight in water. The invention replenishes water with the hydrogel, meets the long-time working requirements of the LED lighting equipment, does not consume electric energy compared with the traditional LED heat dissipation technology, and has very large energy-saving potential.

In order to better understand the above-mentioned technical solution, the above-mentioned technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

The purpose of the present invention is to provide a heat dissipation technology applied to the light-emitting surface of high-power LED lighting equipment, and the main body to realize the heat dissipation function is hydrogel. Hydrogel has good mechanical and thermal properties, transparency, and recyclability. When large-scale LED lighting equipment is working, the hydrogel film containing water will be under high heat flux, and the water inside will evaporate. The variable takes away a considerable amount of heat to achieve the effect of heat dissipation.

Preferably, a double-chain hydrogel is used, and the double-chain hydrogel has higher transparency. A highly transparent and tough double-network hydrogel film can be prepared, and the hydrogel film is spread on the outer glass surface of the high-power LED lighting device, and water is supplied to the side of the hydrogel film through a water container. The double-chain hydrogel has good mechanical and thermal properties, high transparency, and recyclability, and its cooling power and water absorption capacity are maintained over 50 cooling cycles. The heat dissipation technology of the present invention provides a new form of heat dissipation for high-power LED lighting equipment. Its high transparency and high water absorption characteristics solve the problem that traditional heat dissipation technology cannot cool the light-emitting surface of LED lighting equipment, and effectively cool Lighting tubes.

Specifically, this embodiment provides a heat dissipation system applied to the light-emitting surface of high-power LED lighting equipment, as shown in Figure 1, which is mainly composed of two parts: hydrogel 2 and water replenishment device, wherein the water replenishment device includes water replenishment pipeline 3 and rehydration container4. The hydrogel 2 is used to cover the light-emitting surface of the LED lighting device 1 , and the two ends of the water supply pipeline 3 communicate with the hydrogel 2 and the water supply container 4 respectively.

Preferably, a double-chain hydrogel is used, and a specific double-chain hydrogel is provided below.

A specific double-chain hydrogel provided by the present invention is to use sodium alginate and acrylamide as monomers, N, N'-methylenebisacrylamide as crosslinking agent, ammonium persulfate as photoinitiator, N , N, N', N'-Tetramethylethylenediamine is fully mixed as a cross-linking accelerator, infiltrated with calcium sulfate suspension, irradiated with ultraviolet light at a certain temperature, and fully cooled to obtain a hydrogel.

Specifically, the preparation method of the double-chain hydrogel comprises the following steps:

Step 1, dissolving sodium alginate and acrylamide in deionized water, the weight ratio is 2%, 12% and 86%, and standing for 24 hours;

Step 2, preparing an acrylamide-associated agent-a N,N'-methylenebisacrylamide aqueous solution with a mass fraction of 0.06%, and a photoinitiator for acrylamide-an ammonium persulfate aqueous solution with a mass fraction of 0.17%;

Step 3. After fully mixing the samples obtained in Step 1 and Step 2 and drawing a vacuum, add sodium alginate crosslinking agent—calcium sulfate slurry with a mass fraction of 13% and gel crosslinking accelerator—with a mass fraction of 0.25 % N, N, N', N'-tetramethylethylenediamine solution, mixed evenly;

Step 4: Pour the obtained sample into a glass petri dish, cure it with ultraviolet light (λ=254nm) at 50° C. for 1 hour, then cool it at room temperature for 24 hours to stabilize the reaction, and finally obtain the double-chain hydrogel.

Among them, the partial gel with sodium alginate as monomer forms alginate gel in the final sample, and the partial gel with acrylamide as monomer forms polyacrylamide gel in the final sample. The matrix (alginate gel chains and polyacrylamide gel chains) interweaves and forms covalent crosslinks to form the double-chain hydrogel. The double-strand hydrogel is shown in Figure 2 due to the interpenetrating ionic and covalent crosslinking network, specifically involving calcium ion crosslinking in alginate gels (as shown in Box 5 in Figure 2), Covalent crosslinking of N,N'-methylenebisacrylamide in polyacrylamide gels (as shown in Box 6 in Figure 2), between carboxyl groups of alginate chains and amine groups of polyacrylamide chains covalently cross-linked (as shown in Box 7 in Figure 2), so the double-chain hydrogel exhibits extraordinary toughness and recyclability, and this excellent recyclability further proves that the hydrogel undergoes multiple The mechanical properties and water absorption capacity after cycling were unchanged compared with fresh double-chain hydrogels. The water replenishing device is to replenish water to the double-chain hydrogel after the water in the double-chain hydrogel is continuously evaporated, so as to ensure that the double-chain hydrogel always contains more water, so that the The above-mentioned LED lighting equipment 1 evaporates in time to take away heat when the long-term working temperature is high, so as to maintain its heat dissipation and cooling performance.

In the present invention, the double-chain hydrogel is a functional body with good mechanical and thermal properties as well as repeatable cooling durability and reusability, which can contain more than its weight in its fully swollen state 90% water. Among them, experiments have shown that the transparency of wet and dry hydrogel films is 92% and 90% respectively, and can be applied on the light-emitting surface of LED lighting equipment without affecting its use. It should be noted that the transparency of other hydrogels can also be used on the light-emitting surface of LED lighting equipment without affecting its use.

The specific implementation method can make the hydrogel 2 into a thin film whose area is slightly larger than the area of the light-emitting surface of the LED lighting device 1, and connect the edge part of the hydrogel film with the LED lighting device 1 for heat conduction. The silica gel is bonded together to ensure that the hydrogel film and the LED lighting device 1 are fully bonded without gaps. Alternatively, the hydrogel 2 can also be directly fabricated on the material of the light-emitting surface to form a chemical bond without interfacial material between the two.

Start the LED lighting device 1, and after working for a period of time, the temperature will rise rapidly, the heat flux will increase, and the water inside the hydrogel film in the swollen state will be heated and evaporated to take away the heat through active phase change, and the LED lighting will be inhibited. An increase in temperature of the lighting device 1 . The hydrogel 2 is connected to the water replenishment container 4 through the water replenishment pipeline 3 made of capillary material. As the working time of the LED lighting device 1 continues to increase, the water in the hydrogel 2 The water will continue to evaporate, and the water content will decrease. Due to the capillary action of the water supply line 3, a potential difference is formed between the two ends of the water supply line 3—the hydrogel 2 and the water supply container 4. Under the action of the potential difference, the water in the hydration container 4 is transported into the hydrogel 2 , so as to realize the hydration of the hydrogel 2 . Due to the existence of the potential difference, the water in the water supply container 4 is continuously transported to the hydrogel 2, and then evaporated, so that the water continues to be evaporatively cooled. In addition to the above-mentioned method of replenishing water in a non-driven form using capillary materials, it is also possible to use a power-driven method for replenishing water. For example, the water supply device may include a water supply container, a water supply pipe, and an electric pump, the electric pump is arranged on the water supply pipe, and the two ends of the water supply pipe are respectively communicated with the hydrogel and the water supply container, through which the The above-mentioned electric pump realizes power-driven water replenishment.

In the implementation case, when the hydrogel 2 is not applied to the LED lighting equipment 1, the temperature of the LED lighting equipment 1 will rise rapidly and form a higher temperature equilibrium with the working environment, and its temperature The change is shown in curve 8 in FIG. 3 . When the hydrogel 2 is covered on the LED lighting device 1, the temperature of the hydrogel 2 will rise together with the surface temperature of the LED lighting device 1, the higher the temperature, the more intense the active phase transition , a large amount of heat is taken away with the phase change, and the hydrogel 2 and the LED lighting device 1 will form a lower temperature equilibrium with the working environment, and the temperature change is shown in curve 9 in FIG. 3 . It can be seen that the heat dissipation technology provided by the present invention has a very considerable heat dissipation effect.

In summary, the present invention makes full use of the hydrogel's high water absorption capacity, high transparency, good mechanical and thermal properties, and reusability, and is applied to the light-emitting surface of high-power LED lighting equipment to dissipate heat and control the rise in operating temperature. High, simple equipment but high heat dissipation efficiency, low cost, and no power consumption, it has great potential for energy saving.

A heat dissipation system and method applied to the light-emitting surface of high-power LED lighting equipment provided by the embodiments of the present invention at least includes the following technical effects:

In the embodiment of this application, the hydrogel is directly spread on the light-emitting surface of the high-power LED lighting equipment, and when the temperature of the equipment rises, the moisture contained in the hydrogel film is evaporated and the heat is taken away in time, and the temperature drop of the LED equipment is suppressed. keep rising. The present invention uses the active phase change heat transfer method to effectively realize heat dissipation, and the adopted hydrogel has good mechanical and thermal properties, high transparency, strong reusability, and can contain in its fully swollen state More than 90% of its weight in water. The invention replenishes water with the hydrogel, meets the long-time working requirements of the LED lighting equipment, does not consume electric energy compared with the traditional LED heat dissipation technology, and has very large energy-saving potential.

Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention without limitation, although the present invention has been described in detail with reference to examples, those of ordinary skill in the art should understand that the technical solutions of the present invention can be carried out Modifications or equivalent replacements without departing from the spirit and scope of the technical solution of the present invention shall be covered by the claims of the present invention.

Claims (10)

1. a kind of cooling system applied to high-power LED (light emitting diode) lighting equipment light-emitting surface, which is characterized in that including：Hydrogel, moisturizing Device；

The hydrogel is coated on the light-emitting surface of LED illumination device, and the water replanishing device is connected to the hydrogel, the water After moisture constantly evaporation in gel, the water replanishing device carries out moisturizing to the hydrogel.

2. the cooling system according to claim 1 applied to high-power LED (light emitting diode) lighting equipment light-emitting surface, which is characterized in that The hydrogel is double-strand hydrogel.

3. the cooling system according to claim 1 applied to high-power LED (light emitting diode) lighting equipment light-emitting surface, which is characterized in that The water replanishing device includes water supply line and moisturizing container, and the water supply line is made of capillary materials, the water supply line Both ends respectively with the hydrogel, the moisturizing reservoir.

4. the cooling system according to claim 1 applied to high-power LED (light emitting diode) lighting equipment light-emitting surface, which is characterized in that The water replanishing device includes moisturizing container, water-supply-pipe, electrodynamic pump, and the electrodynamic pump is arranged on the water-supply-pipe, the water delivery The both ends of pipe respectively with the hydrogel, the moisturizing reservoir.

5. the cooling system according to claim 1 applied to high-power LED (light emitting diode) lighting equipment light-emitting surface, which is characterized in that The marginal portion of the hydrogel is bonded together with the LED illumination device light-emitting surface by heat conductive silica gel.

6. a kind of heat dissipating method applied to high-power LED (light emitting diode) lighting equipment light-emitting surface, which is characterized in that hydrogel to be coated with On the light-emitting surface of LED illumination device, the moisture evaporated contained by inside by the hydrogel takes away the LED illumination device in time Heat；After moisture constantly evaporation in the hydrogel, moisturizing is carried out to the hydrogel by water replanishing device.

7. the heat dissipating method according to claim 6 applied to high-power LED (light emitting diode) lighting equipment light-emitting surface, which is characterized in that The hydrogel is double-strand hydrogel.

8. the heat dissipating method according to claim 6 applied to high-power LED (light emitting diode) lighting equipment light-emitting surface, which is characterized in that It is described hydrogel is coated with the specific implementation on the light-emitting surface of LED illumination device to be：Film is made in the hydrogel, Obtain hydrogel thin film；The area of the hydrogel thin film is more than the area of the LED illumination device light-emitting surface；By the water-setting The marginal portion of glue film is bonded together with the LED illumination device light-emitting surface by heat conductive silica gel.

9. the heat dissipating method according to claim 6 applied to high-power LED (light emitting diode) lighting equipment light-emitting surface, which is characterized in that The water replanishing device includes water supply line and moisturizing container, and the water supply line is made of capillary materials, the water supply line Both ends respectively with the hydrogel, the moisturizing reservoir.

10. the heat dissipating method according to claim 6 applied to high-power LED (light emitting diode) lighting equipment light-emitting surface, which is characterized in that The water replanishing device includes moisturizing container, water-supply-pipe, electrodynamic pump, and the electrodynamic pump is arranged on the water-supply-pipe, the water delivery The both ends of pipe respectively with the hydrogel, the moisturizing reservoir.