设为首页 | 关于我们 | 电加热管 | 辅助计算中心 | 联系我们
Search
webmaster
admin
passweord
最新技术资料
在线计算
技术中心
联系我们

昆山特耐佳五金电器有限公司

欢迎您前来洽谈业务:

热线1: 0512-57123258
热线2: 0512-57123268
热线3: 0512-81865722
传真: 0512-57427991
地址: 苏州市昆山南港望江路178号
位置:首页≥怎么样选择电加热管


  • 怎么样选择电加热管

    2015年11月19日 by admin

    怎样选择电加热管?

    各位尊敬的客户,欢迎您来到我们的公司网站,请允许我为大家来介绍如何来选择电加热管

    How to choose the electric heating tube?

     

    The distinguished customers, welcome you to our company website, please allow me to introduce you to how to choose the electrical heating tube

    首先:电热管的选择需考虑功率:
    电热管的功率的计算,通过规范的和统一的计算可以方便一般按以下三步进行:

    1.计算维持介质温度不变的前提下,实际所需要的维持温度的功率
    2.计算从初始温度在规定的时间内加热至设定温度的所需要的功率
    3.根据以上两种计算结果,选择加热器的型号和数量。总功率取以上二种功率的最大值并考虑1.2系数。
    公式:
    1.维持介质温度抽需要的功率
    KW=C2M3△T/864+P
    式中:M3每小时所增加的介质kg/h
    2.初始加热所需要的功率
    KW = ( C1M1△T + C2M2△T )÷ 864/P + P/2
    式中:C1C2分别为容器和介质的比热(Kcal/Kg℃)
    M1M2分别为容器和介质的质量(Kg)
    △T为所需温度和初始温度之差(℃)
    H为初始温度加热到设定温度所需要的时间(h)
    P最终温度下容器的热散量(Kw) 

    In electrical performance curve often used in the calculation of heat pipe.

     

    在电热管计算中经常要用到的性能曲线。

     

    如何来选择电加热管

    电热管的选择需考虑电压:

    电热管的电压规格一定要在选购之前确认好。这个步骤的确认就等于设备上电阻值的固定,电压越大,功率越大,当选错后特别容易让电压的大小超过电热管的负荷引发电阻丝熔断,甚至电热管击穿的问题。常规电压规格:24V、36V、48V、110V、220V、380V,通常我们指的电压是额定电压。
    电热管的额定电压:
    电热管额定电压指再设计时规定并在电热管外壳上标注的接在电热管上的电压。

    The choice of electric heating tube voltage should be considered:

     

    The voltage of electric heating tube specifications must be confirmed before the choose and buy is good. This step confirmation means, fixed device resistance and voltage, the greater the power, the greater the elected the wrong especially easy to make the size of the voltage more than electric heat pipe load resistance wire fusing, even the breakdown of the electric heating tube. Specification: conventional voltage 24 v, 36 v, 48 v, 110 v, 220 v, 110 v, we usually refers to the voltage is the rated voltage.

    The rated voltage of electric heating tube:

    Rated voltage refers to redesign the electric heating tube, and annotations on electric heat pipe shell in the voltage on the electric heating tube. or

     

     

    电热管的选择需考虑长度:

    电热管的功率设定为:正常情况下管子的总长度(单位:米)与电热管的功率(单位:瓦)之比为1:2的关系,功率的最大比例是1:2.5的关系。

    The choice of electric heating tube length should be considered:

     

    The power setting of the heat pipe is: under normal circumstances the total length of the pipe (in meters) and the power of the electric heating tube (unit: watts) of the relationship between the ratio of 1:2, power is the biggest proportion of 1:2. 5.

    电热管的选择需要考虑管径:

     

     

    电热管的选择需要考虑接线:

    通过计算得出电压,根据电压做出相关接法:
    1.通过计算测量得出:知道其电阻、功率或者其他电气参数则可以通过公式计算出其额定功率。确定好后可以通过测量仪器得出数值。
    公式:I=U/R P=UI=R*I*I=U*U/R 
    式中:I=电流(安);U=电压(伏);R=电阻(欧);功率=P(瓦特)。
    2.实际接线使用得出:一般常规的电热管使用电压为220V、380V,在这两者之间

    The choice of electric heat pipe need to consider the connection:

    Calculated voltage, make relevant connection according to the voltage:

    : 1. Through calculation of measurement to know their resistance, power and other electrical parameters can be through the formula to calculate the power rating. Sure can through measuring instrument after good value.

    Formula: I = U/R P = UI = R * I * I = U/R U *

    In the type: (I) = current (Ann); U = voltage (v); R = resistance (o); Power = P (watts).

    2. The actual connection using concluded: general routine use of electric heating tube voltage of 220 v, 380 v, between the two

     

    电热管的选择考虑镁粉和设计:

    影响电热管电热效率之因素可以概括成一句话:即热传路径上的热阻累计大小决定电热管的电热效率。详细分析按照热传路径上各种过程是否会减小热阻的可能性,如下:
    一、材料的因素:
    1.镁粉的纯度问题:氧化镁纯度大小直接决定了镁砂的导热系数,导热系数愈大,热阻愈小。热传效率愈高,这是材料问题。
    2.镁粉的密度问题:密度大小由填充密度、缩管或整形密度来决定电热管最终的密度。密度值愈大,电热效率愈高,反之愈低。
    二、结构设计:
     众所周知,螺旋状发热丝的外径至金属壳体内壁之距离愈大,其电气绝缘耐压值就愈高,但热传路径就增加,这种路径的增加相当在热传路径上串接了一个衰减器,必然导致电热效率的下降,而缩短这种爬电距离所存在的不利点是常态耐压值将出现较大的下降,现在的关键是要如何评估电热效率偏低而对电热管性能影响而最终作出权衡。
     以镁砂特征和爬电距离为对象描述了对电热效率之间的关系,但是除上述内容对电热效率有较大影响之外,还有热传路径上的最后环节,即管壳材料,除管壁厚度对热阻有关联之外,还要关注在目前四大应用材料中热阻由小至大的基本排列次序:铜<铝<铁<不锈钢,按实际允许条件时尽可能采用导热性较好的材料,这对提高电热效率和提高电热管的性能寿命有一定的促进作用。

    To consider the choice of magnesium powder and electric heating tube design.

    Factors that influence efficiency of electrothermal electric heating tube can be summarized into one sentence: namely, the thermal resistance of heat transfer path determines the electric efficiency of the electric heating tube. Detailed analysis of various process according to the heat transfer path will reduce the possibility of thermal resistance are as follows:

    A, material factors:

    1. The purity of magnesium powder problem: magnesium oxide size directly determines the coefficient of thermal conductivity of sinter and purity, the greater the coefficient of thermal conductivity, the smaller the thermal resistance. The higher the heat transfer efficiency, this is material problem.

    2. The problem of the density of magnesium powder: density size by filling density, shrinkage tube or plastic density to determine the density of electric heat pipe end. The greater the density value, the higher the heating efficiency, lower instead.

    Second, the structure design.

    It is well known that spiral heat wire diameter to the metal shell inner wall of the greater the distance, its electrical insulating pressure value is high, but the heat transfer path increases, the increase of the path is concatenated in the heat transfer path a attenuator, inevitably led to a decline in heating efficiency, the existing drawbacks and shorten the creepage distance is a decline in the normal pressure value will be larger, the key now is how to evaluate electric heating efficiency is low and influence on electric heat pipe performance and eventually make trade-offs.

    With magnesia as object describes the characteristics and creepage distance on the relationship between the electric heating efficiency, but in addition to the above content has a greater effect on heating efficiency, and the last part of the heat transfer path, namely the shell material, in addition to the wall thickness of thermal resistance are linked, but also pay attention to in the present thermal resistance of the big four applied materials: the order from small to big basic copper aluminum < < < iron stainless steel, according to the actual permit conditions as far as possible with good thermal conductivity materials, this to improve the performance of electric heating efficiency and heating tube life have a certain role in promoting.

    Tags: 怎么样选择电加热管  

    本文来自:http://www.tenaijia.com/ 0 Comments, 0 Trackbacks