CN104470006A - Flexible graphite sheet twisting type electric heating tube and manufacturing method thereof - Google Patents
Flexible graphite sheet twisting type electric heating tube and manufacturing method thereof Download PDFInfo
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- CN104470006A CN104470006A CN201410778262.0A CN201410778262A CN104470006A CN 104470006 A CN104470006 A CN 104470006A CN 201410778262 A CN201410778262 A CN 201410778262A CN 104470006 A CN104470006 A CN 104470006A
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Abstract
The invention discloses a flexible graphite sheet twisting type electric heating tube and a manufacturing method of the flexible graphite sheet twisting type electric heating tube. The manufacturing method comprises the steps that an ultra-thin flexible graphite sheet is adopted as an electric heating element twisting around the outer surface of an insulator; afterwards, red copper foil is adopted as electrodes at the two ends of the ultra-thin flexible graphite sheet and connected with a mains supply; thus, water on the inner surface of the insulator is heated, and therefore the instant heating water and electricity separation type electric heating tube is obtained; the outer layer of the graphite sheet is wrapped in an insulating and thermal-insulation material for electric insulation and heat preservation, and the insulating and thermal-insulation material is fiberglass cloth and/or PTFE high-temperature cloth; the heat flux of a heater can reach 0.6-0.8 MW/m<2>; the safety problem caused by overtemperature of the outer surface of the heating tube at high heat flux and the problem of tube bursting caused by the phenomenon that a fluid area inside the heating tube boils and becomes unstable are solved at the same time, and therefore safety is quite high.
Description
Technical field
What the present invention relates to is a kind of technology of articles for daily use field, specifically a kind of flexible graphite platelet wound form electric heating tube and preparation method thereof.
Background technology
Instant electric water heater is more and more widely used in our daily life, and relative to water-storage electric heater, its volume small-power is large, and firing rate is fast.Ensure the safety of instant electric water heater, the most important thing is to see its heating means.There are some problems in current heating means, need to improve all more or less.
The present situation of existing instant electric water heater by inquiry, we find the easy scaling of metal electric heat pipes heat, and easily burn out under high heat flux, surface coating heating requires stricter to coating process, cost is higher, in addition, there is booster problem in the instant electric water heater of existing employing plated film quartz ampoule heating, security performance is bad.
Graphite flake is a kind of brand-new Heat Conduction Material, and it is even along both direction heat conduction, and surface can with other combination of materials such as metal, plastic cement, adhesive sticker to meet more design function and needs; Have high conductive coefficient (150 ~ 1200W/mk), its heat conductivility is not worse than the heat conduction of metal, and its heatproof can reach 400 DEG C, and thermal resistance is low, is a kind of more satisfactory heating material.Possesses at present industrial production technology that is stable and efficient graphite flake, flexible graphite platelet with low cost, high temperature resistant and stable performance, for the research and development of our electric heater are laid a good foundation.
Through finding the retrieval of prior art, open (bulletin) the day 2014.05.21 of Chinese patent literature CN103801227A, disclose a kind of diamond graphite tubular type heating arrangement, it is for heating a synthesis post, and it comprises pyrophyllite block, steel cap, graphite flake, graphite-pipe, ceramic cup and steel bowl; Wherein, described pyrophyllite block is positioned at outermost layer; Described steel cap is arranged at top and the bottom of pyrophyllite block respectively; The bottom of described steel cap is connected on graphite flake; Described steel bowl, ceramic cup, graphite-pipe are coated on synthesis post successively; Described graphite flake is positioned at the two ends up and down of graphite-pipe; Described graphite-pipe is the graphite-pipe without interface.The diamond graphite tubular type heating arrangement of this technology adopts the graphite-pipe of compacting, and its density is high and even, does not have interface simultaneously, and have heating evenly to during the heating of synthesis post, firing rate soon, is conducive to adamantine growth.But this technology adopts graphite-pipe as heating element, the resistance of heater element can be very little, need coupling special small voltage high-current supply could use, be therefore only applicable to special industrial processes, and generally can not be applicable to the power supply of routine civilian 220 volts or 110 volts.
Summary of the invention
The present invention is directed to prior art above shortcomings, a kind of flexible graphite platelet wound form electric heating tube and preparation method thereof is proposed, thickness is adopted to be that 0.01mm ~ 0.5mm ultrathin flexible graphite flake is as heating element, be wrapped in insulator surface to heat heating object, wrap insulate heat-insulating material outside graphite flake, carries out electric insulation and isothermal holding.The present invention has and stablizes durable, high-energy and high-efficiency, the with low cost and simple feature of manufacture craft, by controlling its thickness and canoe is easily processed and mates suitable resistance, is applicable to various different power supply type; Its good flexibility characteristics, is also applicable to the heating object of various difformity and power, can be widely used in all kinds of electric heating equipment, has both been applicable to industrial production in enormous quantities, is also used in the designing and making of the simple and easy high energy heater in laboratory.
The present invention is achieved by the following technical solutions:
The present invention relates to a kind of preparation method of flexible graphite platelet wound form electric heating tube, ultrathin flexible graphite flake is adopted to be wound in the outer surface of insulator as electrical heating elements, then adopt at the two ends of ultrathin flexible graphite flake red copper foil as electrode and be connected with power supply, thus insulator body water is heated, realize instantaneously heated hydroelectric Split type electric heating tube.
Described graphite flake outer layer covers has insulation and thermal insulation material to carry out electric insulation and isothermal holding, and this insulation and thermal insulation material is preferably glass fabric and/or the rare high temperature cloth of poly-tetrem.
The present invention relates to the flexible graphite platelet wound form electric heating tube that said method prepares, can 0.6 ~ 0.8MW/m be realized
2density of heat flow rate can reach, and the resistivity of graphite has negative temperature effect, and its heating tube made can not reduce power in time;
The thickness of described ultrathin flexible graphite flake is 0.01mm ~ 0.5mm.
Described insulator adopts but is not limited to quartz glass, pottery, anodic oxidation insulation aluminum alloy and/or surface treated non-conductive tubing.
Technique effect
Compared with prior art, the present invention adopts ultrathin flexible graphite flake as electrical heating elements, and its conductive coefficient is high, and the temperature homogeneity on heating tube surface is good, and graphite flake is high temperature resistant, can keep good integrality in heating process.High density of heat flow rate (0.6 ~ 0.8MW/m can be realized
2).
For 1 effective heated length (distance between electrode) for 100mm is long, external diameter is the electric heating tube of 20mm, and heating power can reach the power of about 3700 ~ 4900kW; There is the booster problem that boiling wild effect causes in the safety issue of the too high existence of heating tube hull-skin temperature under solution high heat flux simultaneously and heating tube internal flow region, fail safe is fine.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Elaborate to embodiments of the invention below, the present embodiment is implemented under premised on technical solution of the present invention, give detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1
As shown in Figure 1, the present embodiment comprises: insulation heating pipe matrix 1, the red copper foil electrode 2 being wound in heating tube outer surface of matrix ultrathin flexible graphite flake 3 and two ends thereof and graphite flake outer layer covers insulation and thermal insulation material 4.
Described insulation heating pipe matrix have employed the good alumina ceramic tube 1 of thermal conductivity, and it is a kind of with aluminium oxide Al
2o
3for the ceramic material of main body, there is good conductibility, mechanical strength is high, and heat-resisting quantity, at 0.8MW/m
2under high heat flux, the temperature of earthenware outer surface is no more than 400 DEG C, and fail safe is good.
The heating element of described heating tube adopts graphite flake 3, and its conductive coefficient is high, and the temperature homogeneity on heating tube surface is good, and graphite flake is high temperature resistant, can keep good integrality in heating process.And flexible graphite platelet is easy to cut out, can needs to produce difformity easily according to different and mate power supply, power and resistance; Simultaneously ultrathin flexible graphite flake has good flexility and is perfectly wound around or is fitted in by heating insulator surface and have excellent lateral thermal conductivity energy 1000W/mK, heat can be realized transmit efficiently, make the heater designed have the feature of high-energy and high-efficiency.
Described heating tube adopts red copper foil 2 to connect common power as electrode at ultrathin flexible graphite flake two ends, graphite flake outer layer covers insulation and thermal insulation material 4 such as glass fabric, the poly-rare high temperature cloth of tetrem etc. carry out electric insulation and isothermal holding.This electricity separation formula electric heating tube can realize high density of heat flow rate.
In this embodiment, described earthenware 1 length is 120mm, and diameter is 16mm, and graphite flake 3 thickness is 0.05mm, and length is 800mm, and width is 4mm; Graphite flake is wrapped in outside earthenware 1 in the mode of snakelike winding and occupies 80mm pipe range, red copper foil electrode 2 is connected respectively at the two ends of graphite flake 3, then wrap up one deck high-temperature insulation insulated fibre glass cloth 4 at graphite flake outer surface and paste fixing, the method makes simple, cheap, the heating tube power made can reach more than 3KW, and density of heat flow rate can reach 70W/cm
2, there is good practical value.
Claims (6)
1. the preparation method of a flexible graphite platelet wound form electric heating tube, it is characterized in that, ultrathin flexible graphite flake is adopted to be wound in the outer surface of insulator as electrical heating elements, then adopt at the two ends of ultrathin flexible graphite flake red copper foil as electrode and be connected with civil power, thus insulator body water is heated, realize instantaneously heated hydroelectric Split type electric heating tube.
2. the preparation method of flexible graphite platelet wound form electric heating tube according to claim 1, is characterized in that, described graphite flake outer layer covers has insulation and thermal insulation material to carry out electric insulation and isothermal holding.
3. the preparation method of flexible graphite platelet wound form electric heating tube according to claim 1 and 2, is characterized in that, described insulation and thermal insulation material is glass fabric and/or the rare high temperature cloth of poly-tetrem.
4. the preparation method of flexible graphite platelet wound form electric heating tube according to claim 1, is characterized in that, the thickness of described ultrathin flexible graphite flake is 0.01mm ~ 0.5mm.
5. the preparation method of flexible graphite platelet wound form electric heating tube according to claim 1, is characterized in that, described insulator adopts quartz glass, pottery, anodic oxidation insulation aluminum alloy or its combination.
6. the flexible graphite platelet wound form electric heating tube that method prepares according to above-mentioned arbitrary claim, it is characterized in that, density of heat flow rate reaches 0.6 ~ 0.8MW/m
2, and the resistivity of graphite has negative temperature effect, its firing equipment made can not reduce power in time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410778262.0A CN104470006B (en) | 2014-12-15 | 2014-12-15 | Flexible graphite sheet twisting type electric heating tube and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410778262.0A CN104470006B (en) | 2014-12-15 | 2014-12-15 | Flexible graphite sheet twisting type electric heating tube and manufacturing method thereof |
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| Publication Number | Publication Date |
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| CN104470006A true CN104470006A (en) | 2015-03-25 |
| CN104470006B CN104470006B (en) | 2017-01-18 |
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| CN201410778262.0A Active CN104470006B (en) | 2014-12-15 | 2014-12-15 | Flexible graphite sheet twisting type electric heating tube and manufacturing method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104768243A (en) * | 2015-04-07 | 2015-07-08 | 上海交通大学 | Graphite sheet electrical heating component and manufacturing method thereof |
| CN104946862A (en) * | 2015-07-20 | 2015-09-30 | 柳州市建西机械铸造厂 | Heat treatment device |
| CN105860938A (en) * | 2016-03-28 | 2016-08-17 | 上海交通大学 | Graphite film with strengthened critical heat flux and preparation method therefor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0442808A1 (en) * | 1990-02-16 | 1991-08-21 | S.A. "Compagnie Generale De Chauffe" | Electrothermal generator for heating liquids with a strip heating resistor wrapped around the tube |
| CN1068696A (en) * | 1992-07-16 | 1993-02-03 | 山东大学 | The manufacture method of electric heating applique paper and application |
| CN200953714Y (en) * | 2006-05-23 | 2007-09-26 | 吴长欣 | Thermal conducting board |
| CN103608170A (en) * | 2011-04-19 | 2014-02-26 | 福士汽车配套部件责任有限公司 | Multiple-layer electrically heatable medium line |
-
2014
- 2014-12-15 CN CN201410778262.0A patent/CN104470006B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0442808A1 (en) * | 1990-02-16 | 1991-08-21 | S.A. "Compagnie Generale De Chauffe" | Electrothermal generator for heating liquids with a strip heating resistor wrapped around the tube |
| CN1068696A (en) * | 1992-07-16 | 1993-02-03 | 山东大学 | The manufacture method of electric heating applique paper and application |
| CN200953714Y (en) * | 2006-05-23 | 2007-09-26 | 吴长欣 | Thermal conducting board |
| CN103608170A (en) * | 2011-04-19 | 2014-02-26 | 福士汽车配套部件责任有限公司 | Multiple-layer electrically heatable medium line |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104768243A (en) * | 2015-04-07 | 2015-07-08 | 上海交通大学 | Graphite sheet electrical heating component and manufacturing method thereof |
| CN104946862A (en) * | 2015-07-20 | 2015-09-30 | 柳州市建西机械铸造厂 | Heat treatment device |
| CN105860938A (en) * | 2016-03-28 | 2016-08-17 | 上海交通大学 | Graphite film with strengthened critical heat flux and preparation method therefor |
| CN105860938B (en) * | 2016-03-28 | 2018-11-23 | 上海交通大学 | Strengthen the graphite film and preparation method thereof of critical heat flux density |
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| Publication number | Publication date |
|---|---|
| CN104470006B (en) | 2017-01-18 |
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