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外文资料 Principle of electromagnetic heating 1. Principle of electromagnetic heating technology. At this stage for electric heating circle with widespread fever, through the way of conduction of heat to the cylinder, and that only the inside of the heat conduction into the cylinder, most of the lateral heat lost to the air, there is heat conduction losses, and leads to temperature rise, additional resistance wire heating and a weakness is power density is low, there are some occasions will not be ableto adapt to the need to temperature is higher, electromagneticheating technology is to make the metal cylinder itself fever, and according to the specific situation in the cylinder external package heat insulation heat preservation material, thus greatly reduce heatloss, improve the thermal efficiency, can reach more than 96%, so the power saving effect is remarkable, It can reach up to 30%, and the heating rate is increased by 60%, saving the preheating time greatly. Electromagnetic Heating technology English abbreviated: lH, Induction Heating, at the same time, also known asInduction Heating technology is a new way of energy utilization, the Heating process is applied to is heated directly by electromagnetic field and conductor Heating efficiency can reach more than 90%,compared with the traditional Heating mode . Electromagnetic heating equipment is a principle Ol electromagnetic induction electric appliance converts electrical energy into heat energy, inside the electromagnetic equipment controlmovement, the rectifier circuit to 50 hz 1 60 hz ac to dc voltage, through the control circuit to convert dc voltage frequency for 20-40KHZ high-frequency voltage, high speed change of current through the coil produces the changing magnetic field, when the magnetic field lines through the metal, can produce a myriad of small vortexflow inside the metal, such as make the cylinder heated object itself to high fever, which have the effect of heating. Contrast with tradtional heating methods. 1, the traditional resistance heating shortcoming Heat loss: the existing enterprise dedicated heating mode, is the resistance wirewinding, double -side heating circle of inside and outside, the inside(close to the cylinder part) of heat transfer into the cylinder, outside, most of the heat lost to the air, causing direct losses and waste ofelectricity.Environmentaltemperaturerise:becausealotofhealoss,ambienttemperature,especiallyinsummeragreatinfluenceontheproductionenvironment,theworkingtemperaturehavebeenmorethan45degrees,someenterpriseshavetoreducetemperatureusingairconditioning,itcausedthesecondarywasteofenergy. Largeamountofshortservicelife,maintenance:becauseofusingresistancewireheating,electricheatingtubetheheatingtemperatureupto300degrees,thermalhysteresisisbigger,notaccuratetemperaturecontrol,resistancewireiseasytoburnoutduetohightemperatureaging.Theservicelifeofthecommonlyusedelectricheatingcoilisabouthalfayear,sothemaintenanceworkisrelativelylarge.Theadvantagesofhighfrequencyheatingproductsarelong:electromagneticheatingwillnotgenerateheatandlonglife,nomaintenance,nomaintenanceandreplacementcost.Heatingpartadoptscircularcablestructure,cableitselfdoesnotgenerateheat,andcanwithstandhightemperatureabove500C,theservicelifeofupto10years.Nomaintenance,nomaintenancefeeinthelaterperiod.Safeandreliable.theexternalwallofthematerialtubeisheatedbyhigh-frequencyelectromagnetic,andtheheatisfullyutilized.Theheatisconcentratedinsidetheheatingbody.Thesurfacetemperatureoftheelectromagneticcoilisslightly higher than that of room temperature. It can be safely touched, without high temperature protection and safe and reliable. High efficiency and energy saving the internal heating method, directin duction heating body internal molecular magnetic energy and heating, hot start very fast and the average preheating time than the circle of resistance heating mode to shorten by more than 60%, thermal efficiency is as high as 90% above at the same time, unde the same condition, than resistance coil heating power saving 30-7O%, greatly improving the production efficiency. Accurate temperature control the coil itself is not hot, the heat block is small the thermal inertia is low, the internal and external wall temperature is consistent, the temperature control is real-time and accurate, the product quality is improved obviously, and the production efficiency high. Good insulation the electromagnetic coil is specially designed for high temperature and high temperature and high pressure special cable. It has good insulation performance. It needs no direct contact with the outer wall of the tank, no leakage, short circuit fault, safe and secure. Improvement work environment the injection molding machine, which is transformed by electromagnetic heating equipment, adopts the internal heat method The heat is concentrated inside the heating body, and the external heat dissipation is almost nonexistent.Equipment surface temperature can be improved to the human body can touch, the environment temperature from the original resistan cewhen heated above 100 C to room temperature, greatly improve the working environment of manufacturing, strong production worker senthusiasm, reduce the plant ventilation cooling costs in summer. Inline with the concept of people-oriented, we will create an environment-friendly safe and comfortable production environment forfactories and first-line workers.3. Application of electromagnetic heating technology.Energy -saving reform is wide1y used in industria1e1ectromagnetic heating is suitab1e for p1astic machinery, wood,construction, food, medica1, chemica1 and other energy saving transformation, such as plastic injection machine, extrusion machine, b1own fi1m machine, drawing machine, p1astic fi1m,pipe, wire and other machinery, food processing, texti1e,printing and dyeing, meta11urgy, 1ight industry, machinery。surtace heat treatment, weld1n8, boller, bo1l1ng iurnace I and other industries, can rep1ace resistance heating, as we11 as the tradi ti ona1 energy fue1 fire. E1ectromagnetic heating can improve energy efficiency, increase heating speed and improve temper ature contro1 precision. Canned 1ight industries, and other p1astic packaging sea1ing and so on E1ectromagnetic boi1er boi1er industry advantage of the characteristics of the heating speed is quick, can abandon tradi ti ona1 boi1er heating of the who1e, on1y the water of the boi1er for heating, make water f1ow in the f1ow i comp1ete heating, heating speed, save a space. High frequency e1ectromagnetic heating can be used in the machinery industry and meta1 heat trea tment, the effect is significant1y increased than tradi tiona1 way, such as a variety of other mechani ca1 parts quenching, quenching and tempering, annea1ing and norma1izing heat treatment such as heat, pressure processing diathermy before; App1ication of e1ectromagnetic heating techno1ogy is not on1y beneficia1 to product qua1ity, to promote the efficiency of production and saving energy and reduce the cost, a1so improve the technica1 1eve1 of equipment manufacturing enterprises, more and more wide1y accepted and used in tradi tiona1 industry.中文译文 1电磁加热技术原理现阶段用的普遍为电热圈发热，通过传导的方式把热量传到料筒上，而这样只有内侧的热量传导到料筒上，外侧的热量大部分失散到空气中，存在热传导损失，并导致环境温度上升，另外电阻丝加热还有一个缺点就是功率密度低，有一些需要温度较高的场合就无法适应，电磁加热技术是使金属料筒自身发热，并且根据具体情况在料筒外部包裹一定的隔热保温材料，这样就大大减少热量的损失，提高了热效率，可达96%以上，因此节电效果十分显著，可达30%以上，而且加热速度提高60%，大大节省了预热时间。 电磁加热技术英文缩写为： IH，即Induction Heating，同时也称诱导加热技术，是一种新兴的电能利用方式，其加热过程是通过电磁场直接作用于被加热导体，加热效率可达90%以上,大大高于传统的加热方式。同时运用电磁感应加热技术与传统的煤、油、气以及使用电热管的用电 设备相比，在环境保护、使用寿命、安全性能等方面都具有独特优势。电磁加热设备是一种利用电磁感应原理将电能转换成热能的电器，在电磁设备控制机芯内部，由整流电路将50HZ/60HZ的交流电变换成直流电压，再经过控制电路将直流电压转换频率为20-40KHZ的高频电压，高速变化的电流通过线圈会产生高速变化的磁场，当磁场磁力线通过金属时，会在金属体内产生无数的小旋涡流，使料筒等被加热物体本身自行高速发热，从而起到加热的效果。2与传统加热方式的对比1、 传统电阻加热缺点 热损失大：现有企业专用的加热方式，是由电阻丝绕制，圈的内外双面发热，其内面（紧贴料筒部分）的热传导到料筒上，而外面的热量大部分散失到空气中，造成电能的直接损失、浪费。 环境温度上升：由于热量大量散失，周围环境温度升高，尤其是夏天对生产环境影响很大，现场工作温度有的已经超过了45度，有些企业不得不采用空调降低温度，这又造成能源的二次浪费。 使用寿命短、维修量大：电热管由于采用电阻丝发热，其加热温度高达300度左右，热滞后较大，不易精确控温，电阻丝容易因高温老化而烧断。常用电热圈使用寿命约半年，因此，维修的工作量相对较大。 2、 高频加热产品的优势 寿命长：电磁加热因线圈本身基本不会产生热量，寿命长，无需检修，无维护更换成本；加热部分采用环形电缆结构，电缆本身不会产生热量，并可承受500以上高温，使用寿命高达10年。不需维护，后期基本无维护费用。 安全可靠：料筒外壁经高频电磁作用发热，热量利用充分，基本无散失。热量聚集于加热体内部，电磁线圈表面温度略高于室温，可以安全触摸，无需高温防护，安全可靠。 高效节能：采用内热加热方式，加热体内部分子直接感应磁能而生热，热启动非常快，平均预热时间比电阻圈加热方式缩短60%以上，同时热效率高达90%以上，在同等条件下，比电阻圈加热节电3070%，大大提高了生产效率。 准确控温： 线圈本身不发热，热阻滞小、热惯性低，料筒内外壁温度一致，温度控制实时准确，明显改善产品质量，生产效率高。 绝缘性好：电磁线圈为定制专用耐高温高压特种电缆线绕制，绝缘性能好，无需与罐体外壁直接接触，绝无漏电，短路故障，安全无忧。改善工作环境： 经过电磁加热设备改造的注塑机，其采用的内热方式，热量聚集于加热体内部，外部热量耗散几乎没有。设备表面温度可改善至人体可触摸，环境温度从原来电阻圈加热时的100以上降低至常温，大大改善了生产现场的工作环境，有力提高生产工人积极性，降低夏季厂区通风降温费用。本着“以人为本”的理念，给工厂和一线生产人员创造一个环保、安全、舒适的生产环境。3电磁加热技术应用领域工业电磁节能改造广泛应用于适用于塑机械加热、木材、建筑、食品、医疗、化工等节能改造，如塑料注射机，挤出机，吹膜机，拉丝机，塑料薄膜，管材，线材等机器、食品加工、纺织、印染、冶金、轻工、机械、表面热处理及焊接，锅炉，开水炉等行业，可以替代电阻加热，以及燃料明火传统能源。 纺织印染 原料采用电磁加热可以提高能源利用效率，提高加热速度，提高温度控制精度； 轻工行业 罐头以及其它塑料包装的封口等等 锅炉行业 电磁锅炉利用其加热速度快的特点，可抛弃传统锅炉整体加热的方式，只在锅炉的出水端进行加热，使水流在流动中完成加热，加热速度快，节省空间。 机械行业 高频电磁加热可以应用于与金属表明热处理，其效果比传统处理方式有显著提高，其他如各种机械零件的淬火，以及淬火后的回火、退火和正火等热处理的加热，压力加工前的透热； 电磁加热技术的应用，不仅有利于产品品质、生产效率的提升和节能降耗降低成本，也提升了设备制造企业的技术水平，在传统行业中越来越广泛地被接受和使用。
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