CN103265014B - Graphite electronic heat dissipation material production equipment - Google Patents
Graphite electronic heat dissipation material production equipment Download PDFInfo
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- CN103265014B CN103265014B CN201310179791.4A CN201310179791A CN103265014B CN 103265014 B CN103265014 B CN 103265014B CN 201310179791 A CN201310179791 A CN 201310179791A CN 103265014 B CN103265014 B CN 103265014B
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Abstract
The invention relates to graphite electronic heat dissipation material production equipment. A material storage bin is connected with the feeding port of an expansible graphite heating furnace by a spiral conveyor; the discharging pot of the expansible graphite heating furnace is sequentially connected with a primary cyclone solid-gas separator, a secondary cyclone solid-gas separator, an air blower and a gas purifying device; an outlet below the primary cyclone solid-gas separator is connected with the lower feeding port of the expansible graphite heating furnace by the spiral conveyor of a material circulating system; the outlet below the secondary cyclone solid-gas separator is corresponding to a conveyor belt; and the conveyor belt, a primary pressure roller, a rubber roller and a re-calendering device and a mould pressure device are sequentially connected. The graphite electronic heat dissipation material production equipment has the beneficial effects as follows: not only can the energy be saved, but also no carbon is exhausted; the graphite is facilitated to expand sufficiently; thermal conductivity indexes of a product are greatly improved; an electrode is used for carrying out orientated dredge onto worms, so that the graphite bedding surface is prevented from being creased and bent, and therefore, the thermal conductivity indexes of the product are improved to a certain extent.
Description
Technical field
The present invention relates to a kind of Graphite electronic heat dissipation material production equipment.
Background technology
Natural graphite is made up of the aspect of hexagonal array or netted carbon atom.The carbon atom aspect of these hexagonal arraies is smooth substantially and is directed, rule, because the similar of carbon atom in aspect is in alkene, therefore mono-layer graphite is also Graphene, layer and the interlayer of natural graphite are parallel, equidistant substantially, and the hexagonal angle of last layer veil is just in time positioned at next hexagonal center of aspect net, by that analogy.Due to the typical laminate structure of natural graphite, namely the carbon atom of layer and interlayer is combined by more weak Van der Waals bond, and in layer, carbon atom is then by covalent bonds together, just makes its layer and the distance of interlayer carbon atom or makes interlamellar spacing larger
and the spacing of carbon atom is less in aspect
its structural anisotropy i.e., result in its anisotropy in heat conduction, conduction, and the thermal conductivity in its aspect is higher-can reach 2100w/ (m.k) in theory, graphite layers thermal conductivity lower-only have 6w/ (m.k) left and right; As can be seen here, if method is suitable, the higher flexible graphite material of thermal conductivity can be prepared with pure graphite, but the restriction of the upper limit can be subject to, if break through this upper limit, then need to introduce the thermal conductivity material higher than graphite.In ceramic, artificial carbon's nanotube is only had to meet this condition, for 3980-6600 is w/ (m.k) under the thermal conductivity room temperature of artificial Single Walled Carbon Nanotube, double-walled carbon nano-tube is 3580w/ (m.k), multi-walled carbon nano-tubes is 2860w/ (m.k)), as can be seen here, as long as both can be allowed to combine well and play their synergistic effect, will make significantly to be improved by the thermal conductivity of they obtained matrix materials.
At present, the body of heater of graphite expansion stove adopts non-metallic refractory to make mostly, heating source adopts liquefied petroleum gas (LPG), Sweet natural gas or fuel oil mostly, which kind of heating source no matter is adopted all to there is carbon emission problem, in addition raw graphite intensification with expand also be all from outer to inner (namely first furnace air heats by heating source, then by warm air by thermal conduction to graphite), principle is unfavorable for the abundant volatilization of intercalated material in graphite linings, thus, its thermal conductivity of the heat sink material prepared thus is lower.
Up to now, there is not been reported as the research of expanded graphite heating source to utilize pulsed electrical induction field.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned prior art and proposes a kind of Graphite electronic heat dissipation material production equipment, and energy-conservation non-carbon-emitting again, graphite fully expands.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of Graphite electronic heat dissipation material production equipment, it is characterized in that including raw material cabin, worm conveyor, expansible black lead process furnace, one cyclonic solid-gas separator, material circulating system worm conveyor, secondary whirlwind solid-gas separator, blower fan, gas-cleaning installation, first pressure roller, conveying belt, rubber rollers, dredge electrode and calender device or molding device again, raw material cabin is connected by the opening for feed of worm conveyor with expansible black lead process furnace, the discharge port of expansible black lead process furnace and one cyclonic solid-gas separator, secondary whirlwind solid-gas separator, blower fan and gas-cleaning installation are linked in sequence, the lower exit port of one cyclonic solid-gas separator is connected with the underfeed mouth of expansible black lead process furnace by material circulating system worm conveyor, the lower exit port of secondary whirlwind solid-gas separator is corresponding with conveying belt, conveying belt, first pressure roller, rubber rollers and calender device or molding device are linked in sequence again.
By such scheme, described rubber rollers is also provided with and dredges electrode, dredges the orientation that worm carries out, and can avoid calendering procedure that graphite aspect is caused to wrinkle, bends.
By such scheme, described expansible black lead process furnace include expansion body of heater, thermal insulation layer, for being wound around the alundum tube of wire, winding around, pulse medium, high frequency electrical induction heating source, wherein, the external side of expansion furnace is coated with thermal insulation layer successively, for being wound around alundum tube and the winding around of wire, winding around is connected with pulse medium, high frequency electrical induction heating source.
By such scheme, in described pulse medium, high frequency electrical induction heating source, pulse intermediate frequency is 300 ~ 3000KHZ electrical induction heating source, and pulsed high-frequency is 3 ~ 30MHZ electrical induction heating source.
By such scheme, described expansion body of heater is right cylinder and is made up of carbon material, and wherein material is from bottom to top by expansion body of heater, and in it, temperature is 900-1400 DEG C.
Present invention employs pulse medium, high frequency electrical induction heating source, because pulse induction heating efficiency is high, the fast and economize on electricity of heating (will to economize on electricity 15-30% than common medium, high frequency heating source), also non-carbon-emitting (traditional fuel oil, gas furnace all have carbon emission), therefore have remarkable advantage for the high-temperature expansion of expansible black lead.First, the intensification of expansible black lead in stove with expand be stem from graphite conductor inductive impulse current vortex and be that from-inner-to-outer occurs, and furnace gas is non-conductor, itself can not induced electricity eddy current that is do not consume electric energy, its intensification is derived from the thermal conduction of graphite to it, therefore the thermal conduction in this expansion furnace is from graphite to gas, and is from the hot gas of burning to graphite with the thermal conduction in fuel oil or the combustion gas expansion furnace that is heating source; Secondly, the present invention has carried out secondary solid and gas to the graphite worm that expansion upper of furnace body is discharged and has been separated, and the underfeed mouth that the not adequately expanded graphite worm that wherein one cyclonic solid-gas separator separates sends into expansion furnace by worm conveyor reexpands; In addition dredge by using electrode pair worm to carry out orientation, this three measure ensure that the abundant volatilization of inserting graphite layers material, and then the thermal conductivity that graphite itself is had obtains and plays to greatest extent.
Beneficial effect of the present invention:
1) graphite expansion equipment of the present invention, have employed pulsed electrical induction heating source, not only energy-conservation but also non-carbon-emitting (traditional fuel oil, gas furnace all have carbon emission);
2) because the intensification of raw material expansible black lead and expansion are from inside to outside (in traditional fuel oil, combustion gas or liquefied gas expansion furnace, the intensification of graphite and expansion are from outside to inside), the heat energy consumption that in principle, pulsed electrical induction heating source causes because of phase transformation the intercalation thing that the energy input in expansible black lead cycle compensate in graphite just, make temperature field in furnace stable and be uniformly distributed, thus being conducive to graphite and fully expanding;
3) the local circulation system of material is to the sufficient material that do not expand for the first time, and be separated through a solid and gas and return expansion furnace by worm conveyor again, carry out secondary reflation, this measure substantially increases the thermal conductivity index of product;
4) dredge by using electrode pair worm to carry out orientation, graphite aspect can be avoided by wrinkle, bend, this measure improves the thermal conductivity index of product to a certain extent.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the way circuit in pulse medium, high frequency electrical induction heating source.
Embodiment
Introduce the present invention further below by embodiment, but embodiment can not be construed as limiting the invention.
Graphite electronic heat dissipation material production equipment, include raw material cabin 1, worm conveyor 2, expansible black lead process furnace, one cyclonic solid-gas separator 8, material circulating system worm conveyor 9, secondary whirlwind solid-gas separator 10, blower fan 11, gas-cleaning installation 12, first pressure roller 13, conveying belt 15, rubber rollers 16, dredge electrode 17, calender device 18 and molding device 20 again, raw material cabin 1 is connected with the opening for feed of expansible black lead process furnace by worm conveyor 2, the discharge port of expansible black lead process furnace and one cyclonic solid-gas separator 8, secondary whirlwind solid-gas separator 10, blower fan 11 and gas-cleaning installation 12 are linked in sequence, the lower exit port of one cyclonic solid-gas separator 8 is connected with the underfeed mouth of expansible black lead process furnace by material circulating system worm conveyor 9, the lower exit port of secondary whirlwind solid-gas separator 10 is corresponding with conveying belt 15, conveying belt, live roll 14, first pressure roller 13, rubber rollers 16 and calender device 18 or molding device 20 more routinely structural order are connected, and described rubber rollers 16 is also provided with dredges electrode 17, dredges the orientation that worm carries out, and calendering procedure can be avoided to cause wrinkle to graphite aspect, bending, expansible black lead process furnace includes expansion body of heater 3, thermal insulation layer 4, for being wound around the alundum tube 5 of wire, winding around 6, in pulse, high-frequency electrical induction heating source 7, in described pulse, in high-frequency electrical induction heating source, pulse intermediate frequency is 300 ~ 3000KHZ electrical induction heating source, pulsed high-frequency is 3 ~ 30MHZ electrical induction heating source, wherein, is coated with thermal insulation layer 4 successively outside expansion body of heater 3, for being wound around alundum tube 5 and the winding around 6 of wire, winding around 6 is with pulse, high-frequency electrical induction heating source 7 is connected, and described expansion body of heater 3 is right cylinder and is made up of carbon material, and wherein material is from bottom to top by expansion body of heater, and in it, temperature is 900-1400 DEG C.
The feature in pulse medium, high frequency electrical induction heating source of the present invention is, after induced electricity eddy current makes graphite flash reach outlet temperature, instantaneous power failure, makes hot-fluid transmit in stove, and then energising is heated again, makes graphite again reach outlet temperature, so repeatedly.This heating means, often logical once electricity, graphite surface temperature rise curve just there will be a zig-zag, therefore claims this heating means to be " pulse zig-zag " heating means, and such heating means can shorten heat-up time 1/5 ~ 1/3.The feature of this pulse induction heating is heated to be master with penetration type, whole heat-processed is the regular working cycle that flash heats up, high temperature is temporarily incubated, heats up, is incubated, and power density remarkably influenced electric eddy current density and distribution thereof, and then remarkably influenced graphite surface temperature.Fig. 2 is shown in by the concrete pulse power, and also can consult authorized this patent of Chinese patent ZL02138937.3-is that the pulse power is used for medium, high frequency field.
The pulse width in pulse medium, high frequency electrical induction heating source of the present invention is ti=8US ~ 120US; Recurrent interval ti:tj=1:3 ~ 1:15; Power=350kw.
The way circuit in pulse medium, high frequency electrical induction heating source of the present invention forms primarily of governor circuit, power amplifier, power source circuit and pilot circuit.Wherein, governor circuit comprises and mixes regulating circuit and driving circuit four part by oscillatory circuit, frequency dividing circuit, pulse (between pulsewidth, arteries and veins), and oscillatory circuit is quartz crystal oscillator circuit; Frequency dividing circuit will be t=0.25US clock pulse signal in the cycle, by counter divided output signal, give the CLK clock end mixing regulating circuit between pulsewidth, arteries and veins, by this end 4 ports i.e. 4 addition on & off switches, recurrence interval t32US, t16US, t8US, t4US function can be realized respectively, take advantage of 2 keys can realize selecting the required pulse cycle within the scope of 8 ~ 120US in conjunction with one; Also regulated between arteries and veins by+8 ,+4 ,+2 ,+1 addition rule combination by four switches that the preset number end of this regulating circuit is corresponding again, make it adjustable between 3 times of pulsewidth to 15 times pulsewidths.Driving circuit adopts reverse drive array to carry out reverse drive, 4 input pins wherein connect the high-frequency pulse signal from mixing regulating circuit between pulsewidth, arteries and veins and sending, send respectively from 4 output terminals after reverse drive, the high-frequency pulse signal of output gives power amplifier.Power amplifier selects 4 field effect transistor, 6 current-limiting resistances, by the stack combinations of 4 switches, can realize the adjustment of output rating in wider scope.
Application Example 1
First be 99.92% ~ 99.98%(+50 order by carbon content) and the expansible black lead of the expansion multiplying power 300ml/g prepared by sulfuric acid puts into raw material cabin 1, expansion body of heater 3 is sent into from lower portion of furnace body under negative pressure by worm conveyor 2, expansion body of heater 3 (Φ 120mm) is for right cylinder and be made up of carbon material, adopt pulsed high-frequency (3 ~ 30MHZ) electrical induction heating source, period is warming up to 1250 DEG C also along being expanded to graphite worm with the graphene planes vertical direction of expansible black lead instantaneously owing to giving birth to current vortex in expansible black lead, expand more sufficient worm after one cyclonic solid-gas separator 8 carries out solid and gas separation, enter secondary whirlwind solid-gas separator 10 together by top and air-flow to carry out solid and gas and be separated again, because secondary whirlwind solid-gas separator diameter is much larger than one cyclonic solid-gas separator diameter, therefore graphite worm is got rid of through airtight dumper by separator bottom under gravity, not adequately expanded graphite then sinks to separator bottom due to action of gravity and gets rid of after entering one cyclonic solid-gas separator 8, feed expansion body of heater 3 through material circulating system worm conveyor 9 again and carry out reexpansion, therefore form the local circulation of material between one cyclonic solid-gas separator 8 and expansion body of heater 3.By after the graphite worm got rid of through airtight dumper bottom secondary whirlwind solid-gas separator cooling by below with dredging electrode and having the conveying belt of the motion of stack above it, stack imposes the pressure be close to graphite worm vertical direction, graphite worm volume is greatly reduced along opposite direction when expanding, obtains by the graphite worm of primary compression; Then again through molding device carry out mold pressing or 3-5 section again calender device carry out roll-in and can obtain high thermal conductivity flexible graphite film, plate or the coiled material that thickness is 0.01-1.5mm, the film of gained, plate or its vertical surface thermal conductivity of coiled material are 25-28w/ (m.k), and parallel surface thermal conductivity is more than 750-840w/ (m.k).
Two pieces of 0.5mm that aforesaid method is prepared by application examples are thick, long 957mm, the heating panel of wide 576mm and the import U.S. of limited-liability company of Sichuan Changhong, the heating panel of the same specification of Korea S, the test panel in Ji Jia Seiko company limited of Sichuan Changhong laboratory carries out test comparison respectively, under envrionment temperature is 25 DEG C and the condition as all identical in power supply etc. of other all external conditions, test the changing conditions of temperature with conduction time of 2 points of heating panel same position, test total time is 1h, the temperature of above-mentioned 2 points is write down every 10min, on same time point, the radiating effect of the lower explanation heating panel of its temperature rise is better.The two blocks of heating panels now we provided are listed in the table below 1 respectively with the heating panel correlation data of the U.S., Korea S, table 2:
Table 1
Table 2
Application Example 2
First will be 99.93%(+80 order by carbon content) and the expansible black lead (expansion multiplying power 250 ~ 300ml/g prepared by sulfuric acid, the pH value of solution is 6.5 ~ 6.8) put into raw material cabin 1, expansion body of heater 3 is sent into from lower portion of furnace body under negative pressure by worm conveyor 2, expansion body of heater (Φ 220mm) is for right cylinder and be made up of carbon material, adopt pulse intermediate frequency (300 ~ 3000KHZ) electrical induction heating source, period is warming up to 1400 DEG C also along being expanded to graphite worm with the graphene planes vertical direction of expansible black lead instantaneously owing to giving birth to current vortex in expansible black lead, expand sufficient graphite worm after one cyclonic solid-gas separator 8 carries out solid and gas separation, enter secondary whirlwind solid-gas separator 10 together by top and air-flow to carry out solid and gas and be separated again, because secondary whirlwind solid-gas separator diameter is much larger than one cyclonic solid-gas separator diameter, therefore graphite worm is got rid of through airtight dumper by separator bottom under gravity, not adequately expanded graphite then sinks to separator bottom due to action of gravity and gets rid of after entering one cyclonic solid-gas separator 8, feed expansion body of heater 3 through worm conveyor 9 again and carry out reexpansion, therefore form the local circulation of material between one cyclonic solid-gas separator 8 and expansion body of heater 3.The conveying belt of the motion of stack is had by below above it with electrode by after the graphite worm got rid of through airtight dumper bottom secondary whirlwind solid-gas separator cooling, stack imposes the pressure be close to graphite worm vertical direction, graphite worm volume is greatly reduced along opposite direction when expanding, obtains by the graphite worm of primary compression; Then can obtain through mold pressing or the roll-in of 3-5 section high thermal conductivity flexible graphite film, plate or the coiled material that thickness is 0.01-1.5mm again, its vertical surface thermal conductivity of film, plate or coiled material is 20-25w/ (m.k), and parallel surface thermal conductivity is more than 600-750w/ (m.k).
Claims (3)
1. a Graphite electronic heat dissipation material production equipment, it is characterized in that including raw material cabin (1), worm conveyor (2), expansible black lead process furnace, one cyclonic solid-gas separator (8), material circulating system worm conveyor (9), secondary whirlwind solid-gas separator (10), blower fan (11), gas-cleaning installation (12), first pressure roller (13), conveying belt (15), rubber rollers (16), dredge electrode (17) and calender device (18) or molding device (20) again, raw material cabin (1) is connected with the opening for feed of expansible black lead process furnace by worm conveyor (2), the discharge port of expansible black lead process furnace and one cyclonic solid-gas separator (8), secondary whirlwind solid-gas separator (10), blower fan (11) and gas-cleaning installation (12) are linked in sequence, the lower exit port of one cyclonic solid-gas separator (8) is connected with the underfeed mouth of expansible black lead process furnace by material circulating system worm conveyor (9), the lower exit port of secondary whirlwind solid-gas separator (10) is corresponding with conveying belt (15), conveying belt (15), first pressure roller (13), rubber rollers (16) and calender device (18) or molding device (20) are linked in sequence again, described expansible black lead process furnace include expansion body of heater (3), thermal insulation layer (4), for being wound around the alundum tube (5) of wire, winding around (6), pulse medium, high frequency electrical induction heating source (7), wherein, expansion body of heater (3) outside is coated with thermal insulation layer (4) successively, for being wound around alundum tube (5) and the winding around (6) of wire, winding around (6) is connected with pulse medium, high frequency electrical induction heating source (7), in described pulse medium, high frequency electrical induction heating source, pulse intermediate frequency is 300 ~ 3000KHZ electrical induction heating source, and pulsed high-frequency is 3 ~ 30MHZ electrical induction heating source.
2. Graphite electronic heat dissipation material production equipment according to claim 1, is characterized in that described rubber rollers (16) is also provided with and dredges electrode (17).
3. Graphite electronic heat dissipation material production equipment according to claim 1, it is characterized in that described expansion body of heater (3) is made up of carbon material for right cylinder, wherein material is from bottom to top by expansion body of heater, in it, temperature is 900-1400 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310179791.4A CN103265014B (en) | 2013-05-15 | 2013-05-15 | Graphite electronic heat dissipation material production equipment |
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| CN201310179791.4A CN103265014B (en) | 2013-05-15 | 2013-05-15 | Graphite electronic heat dissipation material production equipment |
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| CN103265014A CN103265014A (en) | 2013-08-28 |
| CN103265014B true CN103265014B (en) | 2015-02-04 |
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| CN104860310B (en) * | 2015-05-26 | 2017-04-26 | 徐珂 | Biomass fuel expansion furnace for preparing expanded graphite |
| RU2666411C1 (en) * | 2016-12-28 | 2018-09-07 | Акционерное общество "Институт новых углеродных материалов и технологий" (АО "ИНУМиТ") | Plant for manufacturing heat-distributing material |
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| CN100392126C (en) * | 2005-03-31 | 2008-06-04 | 江苏大学 | Magnetic chemical reaction in-situ synthesizing method for preparing metal base nano composite material |
| CN101658066B (en) * | 2007-04-07 | 2012-09-05 | 应达公司 | Current fed inverter with pulse regulator for electric induction heating, melting and stirring |
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