【摘要】：LED光源的推廣應(yīng)用是照明領(lǐng)域的一場新的革命，其發(fā)光效率已突破100lm/W，有望在照明領(lǐng)域占據(jù)主導(dǎo)地位。相對于傳統(tǒng)的照明光源，其具有壽命長、耗能低、可控性高等眾多優(yōu)點(diǎn)。隨著人類對照明越來越高的需求，LED光源朝著大功率、高集成化的方向發(fā)展，散熱問題成為了制約LED光源發(fā)展的核心問題，散熱不理想將導(dǎo)致光衰、壽命降低以及可靠性降低等一系列的問題。本文針對LED散熱問題，設(shè)計(jì)并制作了3個(gè)肋片散熱器實(shí)物模型，通過實(shí)驗(yàn)研究獲得了最佳安裝角度；并將平板熱管與肋片結(jié)合組成均溫散熱器，搭建了一套可靠的測溫實(shí)驗(yàn)裝置，得到了平板熱管的相關(guān)特性；設(shè)計(jì)了一種新型立柱式熱換散熱器，探索了一套仿真優(yōu)化設(shè)計(jì)方法并進(jìn)行了相關(guān)參數(shù)的設(shè)計(jì)，為進(jìn)一步的實(shí)驗(yàn)研究提供了理論模型。本文主要研究成果如下： 1.設(shè)計(jì)制造了3種不同肋片角度的LED用肋片散熱器，，通過實(shí)時(shí)測溫實(shí)驗(yàn)，獲得了3種肋片散熱器在不同安裝角度下與周圍環(huán)境溫度的溫差曲線，得到了肋片安裝角度對散熱性能的影響規(guī)律；參考空氣流動(dòng)的理論并通過仿真計(jì)算出表面對流換熱系數(shù)，結(jié)果表明，肋片對表面對流換熱氣流的行徑路線形成了不同程度的干擾，當(dāng)肋片方向垂直于水平面(即與重力場方向一致)時(shí)，對流換熱氣流的流動(dòng)更加流暢，具有更大的表面對流換熱系數(shù)，可以獲得較優(yōu)的散熱性能。 2.基于一維穩(wěn)態(tài)導(dǎo)熱理論，設(shè)計(jì)了一種新型的銅柱熱源，并搭建了一套可靠的測溫實(shí)驗(yàn)裝置，該測溫系統(tǒng)可以模擬LED芯片陣列產(chǎn)生熱量，精確計(jì)算輸出熱流密度，減少實(shí)驗(yàn)裝置變動(dòng)產(chǎn)生的誤差，結(jié)構(gòu)簡單可靠。 3.提出將平板熱管應(yīng)用到LED散熱領(lǐng)域，將紫銅板與2種不同尺寸的均溫板與肋片散熱器結(jié)合，獲得了3種均溫肋片散熱器；利用本文設(shè)計(jì)的測溫實(shí)驗(yàn)裝置，獲得了各個(gè)測溫點(diǎn)的溫差，測試了均溫散熱器在不同輸入熱流密度下的均溫性能、均溫性響應(yīng)特性和熱阻。 4.設(shè)計(jì)了3種新型熱管散熱器，提出了相應(yīng)的充液及抽真空結(jié)構(gòu)與具體方法，對管殼材料與工作介質(zhì)進(jìn)行了選擇；設(shè)計(jì)了一種利用銅絲網(wǎng)彎卷制成的絲網(wǎng)吸液芯結(jié)構(gòu)，該結(jié)構(gòu)熱阻小、制作簡單，并可防止與熱管內(nèi)壁發(fā)生位移與脫離。 5.仿真研究了變量分別為熱管直徑d、熱管高度H、肋片數(shù)量N時(shí)的散熱器熱特性；探索了一套仿真優(yōu)化設(shè)計(jì)方法，可在保證芯片證結(jié)溫小于75℃的情況下，獲得體積最小的立柱式熱管散熱器。
[Abstract]:The popularization and application of LED light source is a new revolution in the field of lighting. Its luminous efficiency has exceeded 100lm / W, and it is expected to occupy a dominant position in the field of lighting. Compared with the traditional lighting source, it has many advantages, such as long life, low energy consumption, high controllability and so on. With the increasing demand for lighting, the LED light source is developing in the direction of high power and high integration. Heat dissipation has become the core problem that restricts the development of LED light source, and the poor heat dissipation will lead to light decay. A series of problems such as lower life and lower reliability. In order to solve the problem of LED heat dissipation, three real object models of fin radiator are designed and made in this paper, and the optimal installation angle is obtained through experimental research. The flat heat pipe is combined with the ribbed plate to form a uniform temperature radiator, and a set of reliable experimental device for measuring the temperature is built, and the related characteristics of the flat heat pipe are obtained. A new type of column heat exchanger is designed, a set of simulation optimization design method is explored and the related parameters are designed, which provides a theoretical model for further experimental research. The main research results of this paper are as follows: 1. Three LED fin radiators with different rib angles are designed and manufactured. The temperature difference curves between the three fin radiators and the ambient temperature at different installation angles are obtained through real-time temperature measurement experiments. The influence of rib mounting angle on heat dissipation performance is obtained. Referring to the theory of air flow, the surface convection heat transfer coefficient is calculated by simulation. The results show that the rib plate interferes with the path of the surface convective heat transfer flow to varying degrees. When the rib direction is perpendicular to the horizontal plane (i.e. consistent with the direction of gravity field), the flow of convective heat transfer flow is more fluid, and the surface convection heat transfer coefficient is larger, and the better heat dissipation performance can be obtained. 2. Based on the theory of one dimensional steady state heat conduction, a new type of copper column heat source is designed, and a set of reliable experimental device for temperature measurement is built. The system can simulate the heat generated by LED chip array and accurately calculate the output heat flux. The structure is simple and reliable because of reducing the error caused by the change of the experimental device. 3. The application of flat heat pipe to the field of LED heat dissipation is put forward. Three kinds of uniform temperature fin radiators are obtained by combining copper plate with two different sizes of uniform temperature plate and fin radiator. The temperature difference of each temperature measuring point is obtained by using the experimental device designed in this paper. The average temperature response characteristic and thermal resistance of the uniform temperature radiator under different input heat flux density are tested. 4. Three kinds of new heat pipe radiators are designed, and the corresponding structure and method of filling liquid and pumping vacuum are put forward, and the materials and working medium of shell and tube are selected. A kind of wire mesh absorbent core structure made of copper wire mesh bending is designed. The structure has the advantages of low thermal resistance, simple fabrication, and can prevent displacement and detachment from the inner wall of heat pipe. 5. The thermal characteristics of the radiator with the heat pipe diameter d, the heat pipe height H and the number of ribs N are studied by simulation. A set of simulation optimization design method is explored to obtain the column heat pipe radiator with the smallest volume under the condition that the chip junction temperature is less than 75 鈩

本文編號：2372902