CN108730940B

CN108730940B - Graphene heat dissipation LED street lamp tube

Info

Publication number: CN108730940B
Application number: CN201810605597.0A
Authority: CN
Inventors: 陈威; 江维
Original assignee: Mingshuo Beijing Electronic Technology Co ltd
Current assignee: Mingshuo Beijing Electronic Technology Co ltd
Priority date: 2018-06-13
Filing date: 2018-06-13
Publication date: 2020-10-09
Anticipated expiration: 2038-06-13
Also published as: CN108730940A

Abstract

The invention provides a graphene heat dissipation LED street lamp tube, which comprises: the LED lamp comprises an LED light source, a heat-conducting temperature-uniforming plate and a radiator, wherein the heat-conducting temperature-uniforming plate is positioned between the LED light source and the radiator; the thermally conductive vapor chamber includes an envelope and a reversible energy storage material located within the envelope. The LED street lamp tube comprises the novel heat-conducting temperature equalizing plate, and the improved heat-conducting temperature equalizing plate has better heat storage and heat conduction effects aiming at the condition that a COB light source needs higher and higher heat dissipation requirements in smaller and smaller closed spaces, so that the temperature of the whole LED street lamp tube is kept uniform, and the service life of a single COB light source cannot be influenced by overhigh local temperature.

Description

Graphene heat dissipation LED street lamp tube

Technical Field

The invention belongs to the technical field of LED lighting, and particularly relates to a graphene heat dissipation LED street lamp tube.

Background

The phase change material is also called latent heat energy storage material, and stores or releases heat energy by utilizing the property (namely phase change enthalpy) that a large amount of heat needs to be absorbed or released when a substance undergoes phase change, so as to adjust and control the ambient temperature around a working source or the material. Latent heat storage, which stores or releases energy by absorbing or releasing heat during phase change by using a phase change material, is the most effective energy storage mode, has the characteristics of high energy storage density, near-isothermal operation and the like, is widely applied to the fields of solar energy utilization, industrial waste heat recovery, electronic heat dissipation, medical use, textiles, aerospace and the like, and is favored by a plurality of researchers.

Phase change materials can be divided into in different ways of material phase state in the heat storage process: solid-liquid phase change materials, solid-solid phase change materials, solid-gas phase change materials, and liquid-gas phase change materials. The solid-liquid phase change material is used in the early product of the applicant, and the heat storage technology for storing heat energy by using solid-liquid phase change latent heat has the advantages of high energy storage density, approximately isothermal heat storage/release process, easily controllable process and the like. As soon as the applicant filed patent 201310714156.1, RLCP (reversible phase change energy storage material) has been developed and applied to the heat dissipation module products produced by the applicant, such products adopt COB concentrated light sources as LED light sources, and because the light sources are concentrated and have high power, compared with the conventional LED street lamps, the RLCP phase change material needs a better heat dissipation facility to support, and solves the heat dissipation problem. With the miniaturization of the glass lens covering the outside of the COB concentrated light source, the COB light source needs higher and higher heat dissipation requirements in smaller and smaller closed space. The current RLCP phase-change material cannot achieve the optimal heat dissipation effect, and therefore, further improvement on the RLCP phase-change material is needed to obtain a phase-change material with better heat dissipation effect.

The applicant has developed a graphene heat dissipation LED street lamp tube product, and applied for patent 201710324906.2, this product employs multiple COB light sources. Because the lamp body space is less, the heat effluvium is more difficult relatively, and company's upgrading product adopts many COB light sources, if whole radiator heat dissipation is inhomogeneous, local heat gives off the life that the difficulty can influence single COB light source, and then influences whole lamp light efficiency.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a novel LED street lamp tube, which comprises a novel heat-conducting temperature equalizing plate, wherein the improved heat-conducting temperature equalizing plate has better heat storage and heat conduction effects aiming at the condition that a COB light source needs higher and higher heat dissipation requirements in smaller and smaller closed spaces, so that the temperature of the whole LED street lamp tube is kept uniform, and the service life of a single COB light source cannot be influenced by overhigh local temperature.

The invention provides a graphene heat dissipation LED street lamp tube, which comprises: the LED lamp comprises an LED light source, a heat-conducting temperature-uniforming plate and a radiator, wherein the heat-conducting temperature-uniforming plate is positioned between the LED light source and the radiator; the thermally conductive vapor chamber includes an envelope and a reversible energy storage material located within the envelope.

In one embodiment of the present invention, wherein the heat sink is a semicircular column heat sink, the heat-conducting temperature equalization plate is fixed on a horizontal end face of the heat sink.

In one embodiment of the present invention, wherein the entire outer surface of the semicircle of the semicircular cylinder of the heat sink is sprayed with a fluorine resin material containing graphene.

In one embodiment of the invention, the LED light source is attached to the heat-conducting temperature-uniforming plate through a heat-conducting silicone grease containing graphene.

In one embodiment of the present invention, wherein the heat conductive and uniform temperature plate is encapsulated with an aluminum alloy material.

In one embodiment of the present invention, wherein the encapsulation comprises a substrate and a cover plate, the substrate having a recess, the reversible energy storage material being located in the recess of the substrate and encapsulated by the cover plate with the substrate.

In one embodiment of the present invention, wherein the lamp tube further comprises: the device comprises a driving power supply, a support, a level gauge, a plug and a lens.

In an embodiment of the present invention, wherein the driving power source is connected to the support, the support is connected to the heat sink, and the lens and the heat sink encapsulate the LED light source and the thermally conductive vapor chamber.

In one embodiment of the present invention, wherein the LED light source employs a COB light source.

In one embodiment of the present invention, the reversible energy storage material of the present invention comprises: the electrostatic spinning matrix is formed by mixing polyethylene wax and polylactic acid and then carrying out electrostatic spinning, and the weight content of the electrostatic spinning matrix is 70-90%, preferably 72%, 75%, 78%, 80%, 82%, 85% and 88% of the total weight of the reversible energy storage material; and a matrix compensator in an amount of 10% to 30%, preferably 12%, 15%, 18%, 20%, 22%, 25%, 28% by weight based on the total weight of the reversible energy storage material.

In one embodiment of the present invention, wherein the matrix compensator is selected from at least one of the following components: carbon nanotubes, graphene particles, fumed silica particles, metal oxide particles, metal nitride particles, and metal particles.

In one embodiment of the present invention, the weight ratio of each component in the matrix compensator is: fumed silica particles 5% to 10%, preferably 6%, 7%, 8%, 9%; 2% -5%, preferably 3%, 4% of carbon nanotubes; 30% -60% of graphene particles, preferably 35%, 40%, 45%, 50%, 55%; the metal oxide particles, metal nitride particles and/or metal particles are 30% to 60%, preferably 35%, 40%, 45%, 50%, 55%.

In one embodiment of the present invention, wherein the particle size of the carbon nanotube, graphene particle, fumed silica particle, metal oxide particle, metal nitride particle and metal particle is between 0.1 to 100 μm, preferably 1 μm, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm.

In one embodiment of the invention, wherein the metal oxide particles are selected from alumina and/or zinc oxide, the metal nitride particles are aluminum nitride, and the metal particles are copper powder.

In one embodiment of the present invention, wherein the preparing process of the electrospun substrate comprises:

adding polyethylene wax and sodium dodecyl sulfate into water, heating, and then stirring in a shear stirrer to obtain an oil-water mixture;

vibrating the obtained oil-water mixture by an ultrasonic vibration crusher to carry out ultrasonic emulsification;

mixing the ultrasonically emulsified oil-water mixture with a polylactic acid aqueous solution, wherein the mass percent of polylactic acid in the polylactic acid aqueous solution is 6-8%, preferably 7%, and the mass ratio of polylactic acid to polyethylene wax is 10: 1-10: 2, preferably 9:1,8:1,7:1,6:1, putting the mixed solution into an ice-water bath, adding polyethylene glycol octyl phenyl ether, and performing ultrasonic treatment by using an ultrasonic vibration crusher;

and spinning the solution containing the polyethylene wax and the polylactic acid after the ultrasonic treatment by adopting an electrostatic spinning device to prepare an electrostatic spinning matrix.

The invention also provides a preparation method of the reversible energy storage material, which comprises the following steps:

mixing the ultrasonically emulsified oil-water mixture with a polylactic acid aqueous solution, wherein the mass percentage of polylactic acid in the polylactic acid aqueous solution is 6-8%, and the mass ratio of polylactic acid to polyethylene wax is 10: 1-10: 2, putting the mixed solution into an ice-water bath, adding polyethylene glycol octyl phenyl ether, and performing ultrasonic treatment by using an ultrasonic vibration crusher;

spinning the solution containing the polyethylene wax and the polylactic acid after the ultrasonic treatment by adopting an electrostatic spinning device;

adding a matrix compensator while spinning so as to enable the matrix compensator to be uniformly embedded into the electrostatic spinning matrix; and (6) cooling.

The reversible energy storage material has the advantages of higher specific surface area, high heat transfer efficiency and low deformability. The invention changes the form of the reversible energy storage material through the electrostatic spinning technology, and the polymer fluid forms the solid fiber with the nanometer or micron size under the electrostatic action, so that the cross section structure of the fiber further enhances the specific surface area and has better heat storage and heat conduction effects.

According to the invention, by adding the matrix compensator, better thermal stability and thermal conductivity are kept, and the carbon nano tube, the graphene and the metal or metal oxide/metal nitride particles are used as the basic components of the matrix compensator, so that point-line-surface full three-dimensional network distribution is finally formed in the spinning matrix, and the spinning matrix has high thermal conductivity and low thermal resistance.

In one embodiment of the present invention, the reversible energy storage material is prepared as follows:

adding 10-12g of polyvinyl alcohol and 10-15 ml, preferably 12ml and 14ml of sodium dodecyl sulfate into 200ml of water, heating the mixture to 75-80 ℃ with the concentration of the sodium dodecyl sulfate being 6-7mmol/l, and then stirring the mixture in a high-speed shear stirrer for 6-8 minutes to obtain an oil-water mixture;

vibrating the obtained oil-water mixture for 10-15 minutes by using an ultrasonic vibration crusher, and carrying out ultrasonic emulsification;

mixing the ultrasonically emulsified oil-water mixture with a polylactic acid aqueous solution, wherein the mass percent of polylactic acid in the polylactic acid aqueous solution is 6-8%, and the mass ratio of polylactic acid to polyethylene wax is 10: 1-10: 2, putting the mixed solution into an ice-water bath, adding 0.5-0.8 g of polyethylene glycol octyl phenyl ether, and carrying out ultrasonic treatment for 15-20 minutes; the purpose of adding the polyethylene glycol octyl phenyl ether is to improve the spinning effect;

spinning the solution containing polyethylene wax and polylactic acid after ultrasonic treatment by using an electrostatic spinning device, wherein the spinning voltage is kept at 18-20kV, the flow rate of the emulsion is kept at 0.7ml/h, and the spinning distance is kept at 10-20m, preferably 15 m;

In one embodiment of the present invention, a novel lamp lighting assembly for road lighting, comprising: the device comprises a driving power supply, a fixed support, a rubber ring, a level gauge, a base, a radiator, a plug, an LED light source and a lens.

In one embodiment of the invention, the driving power supply is connected with the base, the base is connected with the fixed support, the rubber ring is arranged at the connecting position of the fixed support and the base, the fixed support is also connected with the radiator, the LED light source is attached to and fixed on the heat-conducting temperature-uniforming plate through heat-conducting silicone grease containing graphene, the lens is fixedly arranged on the radiator, and the LED light source and the heat-conducting temperature-uniforming plate are arranged between the radiator and the lens.

In one embodiment of the invention, the driving power supply is connected with a fixed support, the fixed support is further connected with a heat radiator, the LED light source is attached and fixed on the heat-conducting temperature-uniforming plate through heat-conducting silicone grease containing graphene, the lens is fixedly installed on the heat radiator, and the LED light source and the heat-conducting temperature-uniforming plate are arranged between the heat radiator and the lens.

In an embodiment of the present invention, the driving power source and the base are fixedly connected by screws, the base is connected with the fixed support, a rubber ring is disposed at a connection position of the fixed support and the base for two-point sealing connection, the fixed support is further connected with the heat sink, and the plug is mounted at the front end of the heat sink by screws and serves as a front cover.

The level gauge is arranged on a base, and the base is in contact connection with a driving power supply.

In one embodiment of the invention, the lens is further fixed on the heat-conducting temperature-uniforming plate by, for example, screws, and the light source is disposed between the heat-conducting temperature-uniforming plate and the lens. And the heat-conducting silicone grease containing graphene is arranged between the light source and the heat-conducting temperature-equalizing plate to realize heat transfer and reduce thermal resistance. The thermal conductive silicone grease material containing graphene adopted is disclosed in the previous patent CN201210119361.9 of the applicant, and is not detailed here.

The heat sink is preferably made of aluminum material or any commercially available aluminum alloy material, and ceramic material or iron material may be selected.

The radiator is a semicircular cylinder, the semicircular surface is processed into a hollow grid shape, the contact area of the radiator and air is increased, and heat conduction is further optimized.

The length of the rectangular longitudinal section of the heat sink is 100 to 300mm, preferably 150 to 250mm, more preferably 180 to 220mm, for example, 190mm, 195mm, 200mm, 205mm, 210mm, etc., and the width thereof is 20mm to 80mm, preferably 30 to 70mm, more preferably 40 to 60mm, and may be 45mm, 46mm, 47mm, 48mm, 49mm, 50mm, 51mm, 52mm, 53mm, 54mm, 55mm, etc. The radiator is a semicircular column, and the radius of the semicircle of the cross section of the radiator is usually 10-40 mm, preferably 15-35 mm, more preferably 20-30 mm, and can be 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, and the like.

In order to further increase heat conduction and heat radiation rate on the premise of optimizing the shape and size, the graphene-containing fluororesin composite is combined with a heat sink in the present invention. The fluororesin heat dissipation material containing graphene is sprayed on the outer surface of the semi-circle of the radiator, so that the heat dissipation efficiency of the radiator is improved. The fluororesin composite material comprising graphene (which may also be referred to as RLCP graphene fluororesin composite material) used has been disclosed in the applicant's prior patent CN201310089504.0 and will not be described in detail herein.

The power supply component adopts a high-efficiency and high-power-factor constant-current isolation driving power supply and is a whole consisting of a plurality of electronic components. The power supply component adopts a cylindrical integrated design, is attractive, and is a hollow cylinder with the height of 5-6cm, so that electronic components are not exposed outside while the driving power supply is ensured to radiate well, and the safety factor is improved. The heat generated by the driving power supply during working is transferred to the fixed radiator in a heat conduction mode, and then is radiated in a radiation and convection mode, so that the damage of the electrical elements of the power supply core is prevented, and the service life of the driving power supply is prolonged.

The LED light source component can adopt various types of lamp light sources, preferably a COB light source, and is an integrated lamp bead. Compare ordinary LED lamp pearl, COB integrated optical source light efficiency is higher, and color tolerance is little. And the chip of COB light source preferably adopts the COB light source of flip-chip technique, and the flip-chip technique has cancelled the sapphire substrate, has reduced the thermal resistance, has further promoted the heat dissipation function of LED lamp.

The lamp beads of the COB light source are distributed on the substrate in a straight line shape, the heat problem is considered after a large number of screening, and the substrate is made of superconducting aluminum, so that the best effect is achieved in the aspect of heat conduction efficiency. Further reducing light attenuation and prolonging service life.

The material of the lens provided by the invention can be glass, PC or PMMA, and is preferably glass.

At present, most of light emitted by LED lamps is distributed in a lambert shape, the central light intensity is strong, and the light is distributed in symmetrical round light spots and cannot be used for direct road illumination. The invention optimizes the lens, directly performs light distribution on the secondary optical lens, the light distribution is distributed in a batwing shape, the illumination is uniform, the glare phenomenon is prevented, the light emitting efficiency reaches more than 95 percent, and the carrier PCB substrate for fixing the LED can adopt any shape meeting the design requirement, and the appearance can be diversified.

The fixing support can be made of any material with good heat conductivity and structure, preferably copper, iron, ceramic, aluminum and corresponding alloy materials, further preferably aluminum and alloy materials thereof, ceramic, and most preferably aluminum alloy materials. The fixing support is preferably made of aluminum alloy, so that the heat conduction and heat radiation effects are enhanced. During installation, the lighting assembly structure is firmly fixed on the fixed support through the screw, and then the fixed support is connected with the base through the screw. When the radiator and the air transfer heat, a part of heat is transferred to the fixed support in a heat conduction mode, the arc-shaped surface of the fixed support is highly attached to the radiator, and the distance of the thinnest attachment position reaches 0.3 cm. On one hand, the fixing support plays a role in fixing, and simultaneously, the fixing support also shares and transfers heat generated by the light source during working, so that the light attenuation rate is reduced, and the service life is prolonged.

The base component for connecting the fixed support and the driving power supply can be made of any one of nylon, metal and PTFE. PTFE is preferred in the invention, and the PTFE material can reduce the occurrence of corrosion aging to the maximum extent considering that the lamp is installed in the surrounding environment in an exposed mode and is subjected to chemical reaction with substances in the air so as to generate corrosion aging and other phenomena. In addition, because the thermal resistance of PTFE is very large, the mutual thermal influence and thermal interference between the front end radiator and the driving power supply can be better avoided.

The whole structure of the base is designed into a column body with a sinking middle, and the influence from horizontal moment is also generated in consideration of the particularity of the installation angle of the lamp. Experiments show that the intermediate structure of the pedestal column has the best stability when sinking for 5cm to 6 cm. The structure plays a role in stable connection, and the fixing bracket does not influence the installation operation.

If the support is the integrated into one piece structure, the support adopts aluminum alloy or other materials, preferred aluminum alloy material.

The material of the plug can be any one of nylon, metal and PTFE. The aluminum alloy is also preferably selected in the invention, so that the whole lamp is more harmonious and beautiful, the heat transfer of the radiator is further accelerated, and the auxiliary heat radiation effect is achieved. Considering that the lamp is installed in the surrounding environment in a closed mode, the lamp is difficult to avoid chemical reaction with substances in the air and corrosion, aging and the like are generated from the inside after a long service period. Because the radiator adopts the processing of integration, the top department of radiator can have the burr, when bringing certain potential safety hazard for the personnel of installation operation, pleasing to the eye degree also can drop, in order to solve this problem, designs into the end cap and hugs closely radiator top semicircle form, and end cap weight control in the scope of 250 grams to 300 grams, avoids producing certain moment, influences the stability of lamps and lanterns installation.

The level gauge is any commercially available level bubble, and can be in any shape such as cylindrical shape, square shape and the like. The material is selected from plastic. The invention optimizes the installation operation process, and takes the special installation angle of the whole lamp into consideration, the level meter and the base are combined, and the level meter is arranged at the upper part of the base, is positioned at the position where the base is in contact connection with the driving power supply, and is 6cm-7cm away from the lowest end of the driving power supply. The level meter can achieve the best use effect. Also during the installation operation, the installation operator is given a level reference to gauge whether the installation is in place. The overall stability of lamps and lanterns has been strengthened to the side, has improved factor of safety.

The reversible energy storage material provided by the invention has the advantages that the polyethylene wax and the polylactic acid are subjected to the electrostatic spinning process through the electrostatic spinning process, and polymer fluid forms nano or micron solid fibers under the electrostatic action, so that the cross section structure of the reversible energy storage material further enhances the specific surface area, and the reversible energy storage material has better heat storage and heat conduction effects.

Drawings

Fig. 1 is an assembly schematic diagram of a graphene heat dissipation LED street lamp tube according to the present invention.

FIG. 2 is a schematic view of the assembly of the heat-conducting vapor chamber of the present invention.

Fig. 3 is a schematic plan view of a test light source substrate in embodiment 10 of the present invention.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented.

Example 1

Adding 12g of polyethylene wax and 15ml of sodium dodecyl sulfate into 200ml of water, heating the mixture to 75-80 ℃ with the concentration of the sodium dodecyl sulfate being 6mmol/l, stirring the mixture in a high-speed shear stirrer for 8 minutes to obtain an oil-water mixture, and carrying out ultrasonic emulsification by using a commercially available ultrasonic vibration crusher, such as an ultrasonic vibration crusher with the model number of FS-250N of Shanghai ultrasonic analyzer, Limited for 15 minutes; mixing polyethylene wax and polylactic acid according to a mass ratio of 1: 5, mixing, preparing the polylactic acid into an aqueous solution before mixing, wherein the mass percent of the polylactic acid in the aqueous solution of the polylactic acid is 8%, putting the mixed solution into an ice-water bath, adding 0.8g of polyethylene glycol octyl phenyl ether, and performing ultrasonic treatment for 20 minutes to obtain the matrix material. Selecting 8g of matrix material, spinning the matrix material by adopting a commercial electrostatic spinning device, such as a spun series of Ucalery, wherein the spinning voltage is kept at 18-20kV, the flow rate of the emulsion is kept at 0.7ml/h, the spinning distance is kept at 20m, and 0.1g of fumed silica particles, 0.1g of carbon nano tubes, 1.2g of graphene particles and 0.6g of copper powder are slowly added while spinning, so that the matrix compensators, namely the fumed silica particles, the carbon nano tubes, the graphene particles and the copper powder are uniformly embedded into the electrostatic spinning matrix and then cooled. And preparing the reversible energy storage material.

The average fiber diameter was calculated by measuring 100 random electrospun fibers of reversible energy storage material using Image J software. The mean fiber diameter was measured by one-way anova and graph-based tests, and was typically statistically different with p <0.05 and found to be 436 nm.

Example 2

Using the method of example 1, example 2 differs from example 1 in that polyethylene wax and polylactic acid are mixed in a mass ratio of 1: 10, mixing; while spinning, 0.1g of fumed silica particles, 0.1g of carbon nanotubes, 0.6g of graphene particles, 0.4g of copper powder, and 0.8g of alumina were gradually added.

The average fiber diameter was calculated by measuring 100 random electrospun fibers of reversible energy storage material using Image J software. The mean fiber diameter was measured as 442nm, with statistical differences generally measured as p <0.05, using one-way anova and graph-based tests on the mean fiber diameter.

Example 3

Example 3 differs from example 1 in that 0.1g fumed silica particles, 0.1g carbon nanotubes, 0.6g graphene particles, 0.4g copper powder, 0.8g alumina were added slowly while spinning, using the method of example 1.

The average fiber diameter was calculated by measuring 100 random electrospun fibers of reversible energy storage material using Image J software. The mean fiber diameter was measured to be 440nm, with statistical differences generally measured as p <0.05, using one-way anova and graph-based tests.

Example 4

Example 4 differs from example 1 in that polyethylene wax and polylactic acid are mixed in a mass ratio of 1: 10, mixing; while spinning, 0.2g of fumed silica particles, 0.1g of carbon nanotubes, 0.5g of graphene particles, 0.4g of copper powder, and 0.8g of alumina were gradually added.

The average fiber diameter was calculated by measuring 100 random electrospun fibers of reversible energy storage material using Image J software. The mean fiber diameter was determined to be 428nm by one-way anova and graph-based tests, with statistical differences generally measured as p < 0.05.

The reversible behavior of the reversible energy storage materials of examples 1 to 4 was investigated using Differential Scanning Calorimetry (DSC), which was a differential scanning calorimeter (Q200). In the sample test, the sample is circularly heated and cooled for 10 times from 0 to 120 ℃ in a circulation mode in nitrogen atmosphere, the heating speed is 10 ℃/min, the flow of nitrogen is 50 ml/min, and the test shows that the difference of the heat absorption capacity of each material per time in the temperature rise process is not more than 8%.

Comparative example 1

Adding 12g of polyethylene wax and 15ml of sodium dodecyl sulfate into 200ml of water, heating the mixture to 75-80 ℃ with the concentration of the sodium dodecyl sulfate being 6mmol/l, stirring the mixture in a high-speed shear stirrer for 8 minutes to obtain an oil-water mixture, and ultrasonically emulsifying the obtained oil-water mixture by using a commercially available ultrasonic vibration crusher, such as an ultrasonic vibration crusher with the model number of FS-250N of Shanghai ultrasonic analyzer, Limited, for 15 minutes to obtain a base material. Selecting 8g of matrix material, spinning the matrix material by adopting a commercial electrostatic spinning device, such as a spun series of Ucalery, wherein the spinning voltage is kept at 18-20kV, the flow rate of the emulsion is kept at 0.7ml/h, the spinning distance is kept at 20m, and 0.1g of fumed silica particles, 0.1g of carbon nano tubes, 1.2g of graphene particles and 0.6g of copper powder are slowly added while spinning, so that the matrix compensators, namely the fumed silica particles, the carbon nano tubes, the graphene particles and the copper powder are uniformly embedded into the electrostatic spinning matrix and then cooled.

Comparative example 2

Adding 12g of polyethylene wax and 15ml of sodium dodecyl sulfate into 200ml of water, heating the mixture to 75-80 ℃ with the concentration of the sodium dodecyl sulfate being 6mmol/l, stirring the mixture in a high-speed shear stirrer for 8 minutes to obtain an oil-water mixture, and carrying out ultrasonic emulsification by using a commercially available ultrasonic vibration crusher, such as an ultrasonic vibration crusher with the model number of FS-250N of Shanghai ultrasonic analyzer, Limited for 15 minutes; mixing polyethylene wax and polylactic acid according to a mass ratio of 1: 5, mixing, preparing the polylactic acid into an aqueous solution before mixing, wherein the mass percent of the polylactic acid in the aqueous solution of the polylactic acid is 8%, putting the mixed solution into an ice-water bath, adding 0.8g of polyethylene glycol octyl phenyl ether, and performing ultrasonic treatment for 20 minutes to obtain the matrix material. Selecting 8g of matrix material, adding 0.1g of fumed silica particles, 0.1g of carbon nano tubes, 1.2g of graphene particles and 0.6g of copper powder into the matrix material, stirring to uniformly mix the matrix compensators of the fumed silica particles, the carbon nano tubes, the graphene particles and the copper powder into the electrostatic spinning matrix, and then cooling.

Comparative example 3

Adding 12g of polyethylene wax and 15ml of sodium dodecyl sulfate into 200ml of water, heating the mixture to 75-80 ℃ with the concentration of the sodium dodecyl sulfate being 6mmol/l, stirring the mixture in a high-speed shear stirrer for 8 minutes to obtain an oil-water mixture, and carrying out ultrasonic emulsification by using a commercially available ultrasonic vibration crusher, such as an ultrasonic vibration crusher with the model number of FS-250N of Shanghai ultrasonic analyzer, Limited for 15 minutes; mixing polyethylene wax and polylactic acid according to a mass ratio of 1: 5, mixing, preparing the polylactic acid into an aqueous solution before mixing, wherein the mass percent of the polylactic acid in the aqueous solution of the polylactic acid is 8%, putting the mixed solution into an ice-water bath, adding 0.8g of polyethylene glycol octyl phenyl ether, and performing ultrasonic treatment for 20 minutes to obtain the matrix material. 8g of the matrix material is selected, spun using a commercially available electrospinning device, for example the SPUN series of Ucalery, with a spinning voltage of 18 to 20kV, a flow rate of the emulsion of 0.7ml/h and a spinning distance of 20m, and then cooled.

Example 5

As shown in fig. 1, the present invention provides a novel lamp lighting assembly for road lighting, comprising: the device comprises a driving power supply 1, a fixed support 2, a rubber ring 3, a level meter 4, a base 5, a radiator 7, a plug 8, a heat-conducting temperature-uniforming plate 9, an LED light source 10 and a lens 11. The driving power supply 1 and the base 5 are fixedly connected through a screw 6, the base 5 is connected with the fixed support 2, and a rubber ring 3 is arranged in the middle position of the connection between the fixed support 2 and the base 5 and used for sealing connection of the two positions. As shown in fig. 2, the heat-conducting temperature-uniforming plate 9 includes a substrate 14 having a groove, a cover plate 12 for encapsulating the reversible energy storage material, and the reversible energy storage material 13, the fixing support 2 is further connected to the heat sink 7, and the plug 8 is mounted at the front end of the heat sink by a screw 6 and serves as a front cover. The level is set on the upper part of the base 5, at the position where the base 5 is in contact connection with the driving power source 1. The lens 11 is fixedly installed on the radiator through screws, the heat-conducting and heat-storage plate is installed on the surface of the radiator 7, the heat-conducting and heat-storage plate is designed in a groove mode, RLCP heat-dissipation materials are packaged inside the heat-conducting and heat-storage plate, the light source 10 is arranged between the heat-conducting and heat-storage plate and the lens 11, and the heat-conducting and heat-storage plate is attached to the horizontal end face of the heat-conducting and heat-storage plate through heat-conducting silicone grease containing graphene and further fixed through screws. A fluorine resin composite material containing graphene is sprayed on the entire surface of the semicircular outer surface of the heat sink 7. The radiator 7 is a semicircular cylinder, the semicircular surface is processed into a hollow grid shape, the contact area of the radiator and air is increased, and heat conduction is further optimized. The size of the horizontal rectangular longitudinal section of the radiator is controlled to be 100-300 mm in length and 20-80 mm in width, and the radius of the semicircular section of the semicircular cylinder is controlled to be 10-40 mm.

Each of the substances used in the examples is a commercially available substance.

The fluororesin composite material of graphene is specifically as follows: the coating is prepared by uniformly stirring 50 mass percent of fluorosilicone resin (provided by Shanghai Hui research New Material Co., Ltd.), 40 mass percent of acrylic diluent, 4 mass percent of electron transfer organic compound polypropylene, 1 mass percent of graphene, 1 mass percent of carbon nano tube, 1 mass percent of titanium dioxide and 3 mass percent of curing agent epoxy resin at the normal temperature of 800-.

The heat-conducting silicone grease containing graphene is specifically prepared by the following steps: the adopted additive components and the mass ratio thereof are as follows: the mass ratio of the carbon nano tube, the graphene and the particles is 1: 6: 3, and the volume ratio of the whole additive to the silicone oil is 6: 4. The purity of the carbon nano tube is more than or equal to 95 wt%, and the ash content is less than or equal to 0.2 wt%. The particles are phase-change capsules wrapping paraffin, the phase-change capsule comprises the paraffin, the paraffin is made of aluminum oxide, the phase-change temperature is 29 ℃, and the average particle size is 60 mu m. The silicone oil is a mixture of dimethyl silicone oil and hydrogen-containing silicone oil with the viscosity of 500000cSt at 25 ℃.

And pouring graphene, metal oxide, metal nitride and/or metal particles in a mass ratio of 6: 3 into a small amount of silicone oil for premixing, slowly adding the carbon nano tube with required mass under the condition of mechanical stirring, and simultaneously replenishing the silicone oil at any time until the content of the silicone oil is required. And (4) continuously mechanically stirring for half an hour, and continuously grinding the mixture for one hour by using a double-roller grinder to obtain the final silicone grease.

The radiator is made of aluminum alloy (AL6063-T5) and has a horizontal rectangular longitudinal section with a length of 200mm and a width of 50mm, and a semicircular radius of a transverse section of 31 mm. The thermally conductive vapor chamber encapsulation was also prepared using aluminum alloy (AL6063-T5) for encapsulating the reversible energy storage material prepared in example 1.

And (3) carrying out deoiling and decontamination cleaning treatment on the surface of the radiator, fully stirring the prepared graphene fluorine resin composite material, pouring the mixture into a spray gun, setting the pressure of the spray gun to be 0.4MPa, aligning the spray gun to the target surface, and spraying the mixture for 2-3 times back and forth, so that the coating uniformly covers the surface of an object. The coating is uniform and bright, the thickness of the coating can be optimally selected according to needs, and the coating can be naturally air-dried and cured for 12 hours or placed in an oven for baking for 10 minutes for rapid curing.

The light source is a COB light source with model number G4N2CD120-F1221-L1350336h of Shenzhen Daizhong semiconductor Limited, and the power source is a 30W direct current output power source with model number FS-30W-0.9A of Shenzhen Shenshu Ophich opto-electronic technology Limited.

In the manner described in figure 1, an aluminium support (of dimensions AL 6063) is used

). A PC level meter is adopted, a PMMA lens is adopted as a lens, a PC plug is adopted, the components are assembled according to the mode of a figure 1 to obtain the graphene heat-dissipation LED street lamp tube, and the light source is attached to the heat-conduction temperature-uniforming plate through the heat-conduction silicone grease containing the graphene prepared in the previous mode.

Example 6

The same procedure as in example 5, except that the thermally conductive vapor chamber was encapsulated to encapsulate the reversible energy storage material prepared in example 2, was used in comparison with example 5.

Example 7

The same procedure as in example 5, except that the thermally conductive vapor chamber was encapsulated to encapsulate the reversible energy storage material prepared in example 3, was used in comparison with example 5.

Example 8

The same procedure as in example 5, except that the thermally conductive vapor chamber was encapsulated to encapsulate the reversible energy storage material prepared in example 4, was used in comparison with example 5.

Comparative example 4

The same procedure as in example 5 was followed, except that the thermally conductive vapor chamber was encapsulated to encapsulate the energy storage material prepared in comparative example 1, as compared to example 5.

Comparative example 5

The same procedure as in example 5 was followed, except that the thermally conductive vapor chamber was encapsulated to encapsulate the energy storage material prepared in comparative example 2, as compared to example 5.

Comparative example 6

The same procedure as in example 5 was followed, except that the thermally conductive vapor chamber was encapsulated to encapsulate the energy storage material prepared in comparative example 3, as compared to example 5.

Comparative example 7

Similar to the method of example 5, the only difference compared to example 5 is that no thermally conductive vapor chamber is used.

Example 9

Adopt AT4532 high accuracy multichannel temperature tester: the multi-channel temperature tester is an instrument suitable for simultaneously monitoring and tracking multipoint temperatures in real time. The thermocouple testing point measuring device has the advantages of convenience in measurement, high precision and reusability.

And (3) testing conditions are as follows: ambient temperature: 25 ℃, ambient humidity: and 55 percent.

Hot-line method: GB10297-88 method for measuring thermal conductivity of non-metallic solid material. And thermocouples of the multi-path temperature tester are respectively connected to the light source substrate, the sample is lightened for 120 minutes, and the current temperature is recorded every 10 minutes. The temperature differences between comparative examples 5 to 8 and comparative examples 4 to 7 were compared, and the results are shown in Table 1.

TABLE 1 light source substrate temperature

As can be seen from table 1, examples 5 to 8 employed the thermally conductive and temperature-uniforming plate having the reversible energy storage material of examples 1 to 4, comparative example 4 employed the thermally conductive and temperature-uniforming plate having the energy storage material of comparative example 1, in which the energy storage material did not contain polylactic acid, comparative example 5 employed the thermally conductive and temperature-uniforming plate having the energy storage material of comparative example 2, in which the energy storage material was not subjected to the electrospinning process, comparative example 6 employed the thermally conductive and temperature-uniforming plate having the energy storage material of comparative example 3, in which the energy storage material did not employ a matrix compensator, and comparative example 7 did not employ any thermally conductive and temperature-uniforming plate. The temperature of the light source substrates in examples 5 to 8 was significantly lower than that of the light source substrates in comparative examples 1 to 4, whereas the temperature of the light source substrate in example 7, in which the thermally conductive temperature-uniforming plate was not used, was the highest. It is shown that the street lamps of examples 5 to 8 have the strongest heat dissipation capability, the street lamps of comparative examples 4 to 6 have the slightly worse heat dissipation capability, and the street lamps of comparative example 7 have the worst heat dissipation capability. Therefore, the light source lighting effect is further improved by improving the reversible energy storage material, the light attenuation is reduced, and the heat dissipation efficiency of the street lamp is improved.

Example 10.

The temperature at the four corners of the light source substrate (point A, B, C, D in the following table) and the temperature at the light source substrate between the COB light sources (points E and F in the following table) were measured separately as in example 9, referring to fig. 3, the sample was lit for 120 minutes, and the current temperature at each point was set to be recorded every 10 minutes. Comparative example 5 and comparative example 7, the data of the results are shown in table 2.

TABLE 2 temperature at different positions of the light source substrate

As can be seen from table 2, the temperatures of the light source substrates of the thermal vapor chamber using the reversible energy storage material at different positions are almost the same, and the temperature of the entire light source substrate is uniform, while the temperature of the light source substrate without the thermal vapor chamber is significantly higher than that of A, B, C, D at positions E and F, and is not completely the same at position A, B, C, D, thereby indicating that the uniformity of the thermal conductivity of the light source substrate without the thermal vapor chamber is poor.

All of the above mentioned intellectual property rights are not intended to be restrictive to other forms of implementing the new and/or new products. Those skilled in the art will take advantage of this important information, and the foregoing will be modified to achieve similar performance. However, all modifications or alterations are based on the new products of the invention and belong to the reserved rights.

The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.

Claims

1. The utility model provides a graphite alkene heat dissipation LED street lamp fluorescent tube which characterized in that:

the lamp tube comprises: the LED lamp comprises an LED light source, a heat-conducting temperature-uniforming plate and a radiator, wherein the heat-conducting temperature-uniforming plate is positioned between the LED light source and the radiator;

the heat-conductive vapor chamber includes: an encapsulation and a reversible energy storage material located inside the encapsulation;

the reversible energy storage material comprises:

the electrostatic spinning matrix is formed by mixing polyethylene wax and polylactic acid and then performing electrostatic spinning, and the weight content of the electrostatic spinning matrix is 70-90% based on the total weight of the reversible energy storage material; and

the matrix compensator accounts for 10-30% of the total weight of the reversible energy storage material;

the matrix compensator is selected from at least one of the following components: carbon nanotubes, graphene particles, fumed silica particles, metal oxide particles, metal nitride particles, and metal particles;

and adding a matrix compensator while spinning so as to uniformly embed the matrix compensator into the electrostatic spinning matrix, thereby obtaining the reversible energy storage material.

2. The graphene heat dissipation LED street lamp tube according to claim 1, wherein the heat sink is a semicircular cylinder heat sink, and the heat conduction temperature equalization plate is fixed on a horizontal end face of the heat sink.

3. The graphene heat dissipating LED street lamp tube according to claim 2, wherein the entire outer surface of the semicircle of the semicircular cylinder of the heat sink is coated with a fluorine resin material containing graphene.

4. The graphene heat dissipation LED street lamp tube according to any one of claims 1 to 3, wherein the LED light source is attached to the heat-conducting temperature-uniforming plate through a heat-conducting silicone grease containing graphene.

5. The graphene heat dissipation LED street lamp tube according to any one of claims 1 to 3, wherein the heat-conducting and temperature-uniforming plate is encapsulated by an aluminum alloy material.

6. The graphene heat dissipating LED street light tube according to any one of claims 1 to 3, wherein the encapsulation comprises a substrate and a cover plate, the substrate has a groove, and the reversible energy storage material is located in the groove of the substrate and encapsulated by the cover plate in combination with the substrate.

7. The graphene heat dissipating LED street lamp tube according to any one of claims 1 to 3, wherein the lamp tube further comprises: the device comprises a driving power supply, a support, a level gauge, a plug and a lens.

8. The graphene heat dissipating LED street lamp tube according to claim 7, wherein the driving power supply is connected to the support, the support is connected to the heat sink, and the lens and the heat sink encapsulate the LED light source and the heat conducting vapor chamber.

9. A thermally conductive vapor chamber, comprising: an encapsulation and a reversible energy storage material located inside the encapsulation;

the reversible energy storage material comprises:

10. The thermally conductive vapor plate of claim 9, wherein the encapsulation comprises a base plate and a cover plate, the base plate having a recess, the reversible energy storage material being located in the recess of the base plate and encapsulated by the cover plate in combination with the base plate.