CN102427621B - Immersive electrical heating pipe for melting and insulating aluminum/zinc metal - Google Patents
Immersive electrical heating pipe for melting and insulating aluminum/zinc metal Download PDFInfo
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- CN102427621B CN102427621B CN201110278453.7A CN201110278453A CN102427621B CN 102427621 B CN102427621 B CN 102427621B CN 201110278453 A CN201110278453 A CN 201110278453A CN 102427621 B CN102427621 B CN 102427621B
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Abstract
The invention discloses an immersive electrical heating pipe for melting and insulating aluminum/zinc metal, which is characterized by comprising a ceramics protecting tube, a plurality of heating elements and an electrode leading-out rod, wherein the electrode leading-out rod is connected with the heating elements; the heating elements are arranged in the ceramics protecting tube; ceramics castable is filled in the ceramics protecting tube; the ceramics protecting tube is a silicon nitride ceramics protecting tube, a silicon carbide ceramics protecting tube, a ceramics protecting tube combining silicon nitride and silicon carbide, or a sialon ceramics protecting tube; and the ceramics castable is silicon carbide ceramics castable or aluminium oxide ceramics castable. Compared with the prior art, according to the immersive electrical heating pipe for melting and insulating aluminum/zinc metal provided by the invention, the cost can be reduced, and through a way of pouring the heating elements and the ceramics protecting tube into a whole, heat generated by the heating elements is efficiently conducted to an aluminum/zinc metal melt through a heat conduction manner.
Description
Technical field
The present invention relates to aluminium/zinc metal melting field, exactly refer to a kind of Immersive electrical heating pipe for the insulation of aluminium/zinc metal molten.
Background technology
The mode of the fusing that existing aluminium and zinc gold close and melt insulation, mainly contain that thermal radiation is reflective, the mode such as crucible type, induction type and immersion (also someone is internal heat type), wherein above reflective, crucible type and be immersed to formula, these three kinds of forms all can be divided into electric heating and fuel-fired (comprising the fuel such as gas-firing, diesel oil and heavy oil).Summarize, the heat preserving mode classification of aluminum alloy melting and melt thereof is as follows:
1, reflective: galvanic reflex formula/fuel is reflective, metal or its melt are in molten bath, electrical heating element or fuel nozzle, above body of heater, are passed to metal by heat reflection heat, and this mode is the main mode of heating of present (particularly Large Furnace) aluminium alloy.
2, crucible type: resistance-type/fuel-fired, as the saucepan of family expenses, aluminium or ZINC ALLOY or its melt are put in crucible, and then mode deposite metal or the heat-insulation metal liquid of crucible bottom heating, this mode is mainly used in casting and Die Casting Industry.
3, induction type: mainly refer to intermediate frequency melting furnace, generate an electromagnetic field in certain space by electric elements, thereby produce eddy current and produce hot mode and melt and be incubated non-ferrous metal in the metal of needs heating or molten metal.
4, be immersed to formula: for electric immersion heating tube; that heating original paper is directly put in the protection tube that is not easy to be corroded by non-ferrous metal liquid; again protection tube is put in molten metal to effect melting aluminum or the kirsite by thermal radiation and conduction after energising or be incubated its melt.And for combustion type heat-generating pipe, be that protection tube is stretched into after molten metal, allow combustion gas directly at combustion inner pipe, heat be passed to molten metal.
But there is certain defect in the mode of the fusing that above existing several aluminium and zinc gold close and melt insulation, specific as follows:
Reflective heating: the advantage of reflective heating is for can remove crucible from, can electricity consumption, the various fuel such as natural gas and heavy oil, and heated non-ferrous metal can be from hundreds of kilogram to tens tons, scope is very wide, is also the main mode of heating of most aluminium alloy smelting furnace.And the fusing of kirsite and insulation often do not adopt this mode of heating.The main defect of its reflective heating is: because being heats from top to bottom, the Temperature Difference Ratio of nonferrous metal melts is larger, and the molten non-ferrous metal taking up can not be dark, and Large Furnace generally can not exceed 600 millimeters, and port generally can not exceed 450 millimeters.Such type of furnace has determined that its surface area ratio is larger, that is to say that energy loss-rate is large, and for molten aluminium stove, the temperature difference of top, molten bath and bottom often reaches 100 DEG C～200 DEG C, and such surface temperature is easy to cause melt liquid level excess Temperature and is oxidized in a large number.Because top and the bottom temperature difference is too many, caused different metal constituent content inhomogeneous of top and the bottom melts, when having reduced aluminium water quality also a large amount of scaling loss aluminium liquid, the aluminium liquid that particularly much contains light metal is more easily burnt.
Crucible type heating: major advantage is that the temperature of melt is more even because heat passes from the bottom up, bath surface, because oxide is fewer clean, is the major way of the stove aluminum/zinc alloy fusing of current Die Casting Industry machine limit and insulation.Its major defect is: for fusing and the heating of aluminium alloy, because crucible is often made with graphite, can not be too large, the aluminium liquid measure taking up is greatly limited, filling on the market aluminium liquid, to exceed the crucible of 1 ton rarely found, and the producer that therefore cannot adapt to large consumption is used; In addition, even if best crucible in the world, its life cycle also only has 3-5 month, and the use cost of crucible is very high; In order to ensure the intensity of crucible, crucible often has 40 millimeters thick, and heat-conductive characteristic is poor, and energy consumption is higher, and while particularly using the fuel such as natural gas and diesel oil, the heat efficiency only has 10% left and right, and other heat energy has all wasted.And for the crucible furnace of molten zinc, there is too the low problem of the heat efficiency by the mode of fuel combustion heating.
Induction type heating: major advantage is that heat produces in metallic object equably, and melt temperature is more even, also cleaner.Its major defect is: because the resistivity of aluminum/zinc alloy is lower, caused the electrical equipment of induction furnace easily bad, use cost is higher, and stove also can not be large, although promote for many years, makes the producer of this type of furnace few on market.
Immersion heating: be considered to solve the best mode of heating of aluminum alloy melting and melt insulation thereof, go for the various type of furnaces, when greatly reducing energy consumption, aluminium/zinc water quality is best.Whole world various countries all relatively pay attention to the research of immersion heater in aluminum alloy melting and insulation for many years, and the immersion heater of various ways has appearred in American-European countries.Major defect is that price is high, and the cost of every is 2～50,000, although handy, due to price, the too high domestic producer in use is few.
Immersion heater mainly realizes by bearing the special protection pipe that high temperature and resistance to non-ferrous metal liquid corrode the object that immerses heating, and it is exactly that the price of protection tube is high that the immersion heating tube of import has individual common ground, and general user is difficult to bear.And domestic immersion heating tube is to fill in an Elema heat-generating pipe in protection tube, owing to can only passing through radiant heat transfer, heat transfer rate is slow, the higher object that could realize insulation melt of temperature of heater element, make the oxidation of protection tube more severe, cause the protection tube life-span shorter, as long as protection tube has a ground square punch, whole pipe will be scrapped, some protection tubes only have just bored a hole for tens days, to such an extent as to the heating tube of the most effective this aluminium and kirsite melt heating and thermal insulation mode is difficult to promote in our country, make the whole aluminium section bar of China and aluminium Die Casting Industry be far longer than external colleague in this index of specific energy consumption, the quality of product is difficult to improve.
Summary of the invention
For above-mentioned defect; the technical problem that the present invention solves is to provide a kind of Immersive electrical heating pipe for the insulation of aluminium/zinc metal molten; can reduce costs; and by the mode that heater element and ceramic protecting pipe are poured into an integrated entity, the heat efficiently heater element being produced conducts to aluminium/zinc metal bath by heat exchange pattern.
In order to solve above technical problem, Immersive electrical heating pipe for aluminum metal or the insulation of zinc metal molten provided by the invention, comprise ceramic protecting pipe, some heater elements and electrode lead-out rod, described electrode lead-out rod is connected with described heater element, described heater element is arranged in described ceramic protecting pipe, fills ceramic castable in described ceramic protecting pipe; Described ceramic protecting pipe is ceramic protecting pipe or the sialon ceramic protecting pipe that silicon nitride ceramics protection tube, silicon carbide ceramics protection tube, silicon nitride are combined with carborundum; Described ceramic castable is silicon carbide ceramics castable or aluminium oxide ceramics castable.
Preferably, the quantity of described heater element is 2-20.
Preferably, the described Immersive electrical heating pipe for the insulation of aluminium/zinc metal molten also comprises fixed support, and described fixed support is tubular type fixed support, and described heater element inserts in described fixed support, fills ceramic castable in described fixed support.
Preferably, the described Immersive electrical heating pipe for aluminum metal or the insulation of zinc metal molten also comprises fixed support, and described fixed support is pillar fixed support, and described heater element is socketed on described fixed support.
Preferably, in described ceramic protecting pipe, be preset with some expansions gap.
Preferably, described expansion gap is by even described heater element interval.
Preferably, filling heat-preservation cotton in described expansion gap.
Preferably, the described Immersive electrical heating pipe for the insulation of aluminium/zinc metal molten also comprises temperature control thermocouple, and described temperature control thermocouple is arranged in described ceramic protecting pipe.
Immersive electrical heating pipe for aluminum metal or the insulation of zinc metal molten provided by the invention, comprise ceramic protecting pipe, some heater elements and electrode lead-out rod, electrode lead-out rod is connected with heater element, and heater element is arranged in ceramic protecting pipe, fills ceramic castable in ceramic protecting pipe; Ceramic protecting pipe is ceramic protecting pipe or the sialon ceramic protecting pipe that silicon nitride ceramics protection tube, silicon carbide ceramics protection tube, silicon nitride are combined with carborundum; Pottery castable is silicon carbide ceramics castable or aluminium oxide ceramics castable.Compared with prior art, Immersive electrical heating pipe for the insulation of aluminium/zinc metal molten provided by the invention, by the mode that heater element and ceramic protecting pipe are poured into an integrated entity, the heat efficiently heater element being produced conducts to aluminium/zinc metal bath by heat exchange pattern, through aerial detection test, electric heating tube temperature difference inner and electric heating tube outside is only 100 DEG C～150 DEG C; Because electric heating tube internal-external temperature difference is lower, heat utilization ratio is high, thereby can reduce the temperature of ceramic protecting pipe, simultaneously by the mode of ceramic castable, has also stopped protection tube by the appearance of high-temperature oxydation situation; Because heater element is to be cast in ceramic protecting pipe, even the individually square punch of ceramic protecting pipe, electric heating tube also can normally be worked, and therefore can effectively extend the useful life of heat-generating pipe; Because each component materials cost of electric heating tube is lower, can reduce production costs in addition.
In addition, Immersive electrical heating pipe wide accommodation for the insulation of aluminium/zinc metal molten provided by the invention, can be used in aluminum melt and the insulation of zinc melt and the fusing of ingot bar, also can be in the work of the molten bath of any volume specification, the fine object that realizes melting and heat preservation.
Brief description of the drawings
Fig. 1 is the structural representation for the longitudinal section of the Immersive electrical heating pipe of aluminum metal or zinc metal molten insulation in the present invention;
Fig. 2 is the structural representation for the cross section of the Immersive electrical heating pipe of aluminum metal or zinc metal molten insulation in the present invention.
Embodiment
For those skilled in the art can understand technical scheme provided by the present invention better, set forth below in conjunction with specific embodiment.
Refer to Fig. 1 and Fig. 2, Fig. 1 is the structural representation for the longitudinal section of the Immersive electrical heating pipe of aluminum metal or zinc metal molten insulation in the present invention; Fig. 2 is the structural representation for the cross section of the Immersive electrical heating pipe of aluminum metal or zinc metal molten insulation in the present invention.
Immersive electrical heating pipe for aluminum metal or the insulation of zinc metal molten provided by the invention; comprise ceramic protecting pipe 1, heater element 4 and electrode lead-out rod 8; electrode lead-out rod 8 is connected with heater element 4; heater element 4 is arranged in ceramic protecting pipe 1; the ceramic castable 2 of the interior filling of ceramic protecting pipe 1; pottery castable 2 pours into an integrated entity heater element 4 and ceramic protecting pipe 1; high temperature that can resistance to 1400 DEG C of left and right, can spread out of by mould material 2 and ceramic protective casing 1 heat that heater element 4 sends in heat conducting mode.Ceramic protecting pipe 1 is any one in silicon nitride ceramics protection tube, silicon carbide ceramics protection tube, silicon nitride ceramic protecting pipe or the sialon ceramic protecting pipe of being combined with carborundum.Pottery castable 2 is the one of silicon carbide ceramics castable, aluminium oxide ceramics castable or the two combination.
Refer to Fig. 2, Immersive electrical heating pipe for aluminum metal or the insulation of zinc metal molten also comprises fixed support 3, fixed support 3 is tubular type fixed support, heater element 4 inserts in fixed support 3, the ceramic castable 2 of the interior filling of fixed support 3, in such cases, ceramic castable 2 is silicon carbide ceramics castable or aluminium oxide ceramics castable.The effect of fixed support 3 is that heater element 4 is fixed, and the heater element 4 between homophase is not contacted preventing when the cast ceramics castable 2.
Fixed support can be also pillar fixed support; heater element is socketed on fixed support; fixed support is inserted in spiral heating element; and then toward the interior cast ceramics castable of ceramic protecting pipe; in such cases, ceramic castable is silicon carbide ceramics castable or aluminium oxide ceramics castable.Support bracket fastened effect is that heater element is fixed, and the heater element between homophase is not contacted preventing when the cast ceramics castable.
The material that fixed support uses is made for aluminium oxide or other non-conductive ceramic material.
According to varying in size of electric heating tube, can be preset with some expansions gap 9 in the direction of axial 360 ° of ceramic protecting pipe 1, the interior filling heat-preservation cotton in expansion gap 9, heat-preservation cotton can be resistance to 1200 DEG C-1700 DEG C.Electric heating tube in Fig. 2 is provided with 3 expansion gaps 9, and expansion gap 9 is by even 6 heater elements 4 interval.The effect in expansion gap 9 is while preventing high temperature, due to the different ceramic protecting pipes 1 that are split up of the coefficient of expansion of inside and outside material.In expansion gap 9, will fill up resistant to elevated temperatures heat-preservation cotton, one can ensure the seam shape that expands, and two can stop air to enter in ceramic protecting pipe 1 when avoiding high temperature and intraductal material generation oxidation reaction.The reserved of expansion gap 9 can be pre-buried and form with hollow metal or nonmetal mould.
Immersive electrical heating pipe for the insulation of aluminium/zinc metal molten also comprises temperature control thermocouple 5, and temperature control thermocouple 5 is arranged in ceramic protecting pipe 1.In order to prevent heater element 4 excess Temperatures, place temperature control thermocouple 5 and controlled the temperature of heater element 4.
Electrode lead-out rod 8 is terminals of heater element 4, for the sake of security, electrode lead-out rod 8 is placed on to 7 li of terminal boxes.
The effect of mounting flange 6 is one can link box 7 and electric heating tube, and two can be fixed on electric heating tube on the furnace wall or furnace roof of heating furnace.
Compared with prior art, Immersive electrical heating pipe for aluminum metal or the insulation of zinc metal molten provided by the invention, by the mode that heater element and ceramic protecting pipe are poured into an integrated entity, the heat efficiently heater element being produced conducts to aluminium/zinc metal bath by heat exchange pattern, through aerial detection test, electric heating tube temperature difference inner and electric heating tube outside is only 100 DEG C～150 DEG C; Because electric heating tube internal-external temperature difference is lower, heat utilization ratio is high, thereby can reduce the temperature of ceramic protecting pipe, simultaneously by the mode of ceramic castable, has also stopped protection tube by the appearance of high-temperature oxydation situation; Because heater element is to be cast in ceramic protecting pipe, even the individually square punch of ceramic protecting pipe, electric heating tube also can normally be worked, and therefore can effectively extend the useful life of heat-generating pipe; Because each component materials cost of electric heating tube is lower, can reduce production costs in addition.
In addition, Immersive electrical heating pipe wide accommodation for aluminum metal or the insulation of zinc metal molten provided by the invention, can be used in aluminum melt and the insulation of zinc melt and the fusing of ingot bar, also can be in the work of the molten bath of any volume specification, the fine object that realizes melting and heat preservation.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiment, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (5)
1. the Immersive electrical heating pipe for aluminum metal or the insulation of zinc metal molten, it is characterized in that, comprise ceramic protecting pipe, some heater elements and electrode lead-out rod, described electrode lead-out rod is connected with described heater element, described heater element is arranged in described ceramic protecting pipe, fills ceramic castable in described ceramic protecting pipe; Described ceramic protecting pipe is ceramic protecting pipe or the sialon ceramic protecting pipe that silicon nitride ceramics protection tube, silicon carbide ceramics protection tube, silicon nitride are combined with carborundum; Described ceramic castable is silicon carbide ceramics castable or aluminium oxide ceramics castable; In described ceramic protecting pipe, be preset with some expansions gap;
Also comprise fixed support, wherein:
Described fixed support is tubular type fixed support, and described heater element inserts in described tubular type fixed support, fills ceramic castable in described tubular type fixed support;
Or described fixed support is pillar fixed support, and described heater element is socketed on described fixed support.
2. the Immersive electrical heating pipe for aluminum metal or the insulation of zinc metal molten according to claim 1, is characterized in that, the quantity of described heater element is 2-20.
3. the Immersive electrical heating pipe for aluminum metal or the insulation of zinc metal molten according to claim 1, is characterized in that, described expansion gap is by even described heater element interval.
4. the Immersive electrical heating pipe for aluminum metal or the insulation of zinc metal molten according to claim 3, is characterized in that, filling heat-preservation cotton in described expansion gap.
5. the Immersive electrical heating pipe for aluminum metal or the insulation of zinc metal molten according to claim 1, is characterized in that, also comprise temperature control thermocouple, described temperature control thermocouple is arranged in described ceramic protecting pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110278453.7A CN102427621B (en) | 2011-09-19 | 2011-09-19 | Immersive electrical heating pipe for melting and insulating aluminum/zinc metal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110278453.7A CN102427621B (en) | 2011-09-19 | 2011-09-19 | Immersive electrical heating pipe for melting and insulating aluminum/zinc metal |
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| CN102427621A CN102427621A (en) | 2012-04-25 |
| CN102427621B true CN102427621B (en) | 2014-10-22 |
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Cited By (1)
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| CN104390470A (en) * | 2014-11-07 | 2015-03-04 | 西南铝业（集团）有限责任公司 | Heating pipe and installation method thereof |
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| CN104363671B (en) * | 2014-10-31 | 2015-12-16 | 天津市工大镀锌设备有限公司 | Corrosion resistance to zinc liquid alloy internal heater |
| CN104812110A (en) * | 2015-05-07 | 2015-07-29 | 华能无锡电热器材有限公司 | Moistureproof insulating electric heater and manufacturing method thereof |
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| JP3861714B2 (en) * | 2002-02-28 | 2006-12-20 | 住友電気工業株式会社 | Ceramic heater and semiconductor / liquid crystal manufacturing apparatus using the heater |
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Patent Citations (5)
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| CN1180981A (en) * | 1996-10-25 | 1998-05-06 | 徐国汉 | Heat conductive thermo-resisting compound electric heated body and manufacturing method thereof |
| CN2463812Y (en) * | 2000-12-22 | 2001-12-05 | 周密 | Porous ceramic platinum thermal resistance |
| CN2812479Y (en) * | 2005-07-26 | 2006-08-30 | 姚正礼 | A single-end electric heating pipe |
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| CN104390470A (en) * | 2014-11-07 | 2015-03-04 | 西南铝业（集团）有限责任公司 | Heating pipe and installation method thereof |
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