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电加热器的工作原理是什么?

电加热器的工作原理是什么?

发布日期:2018-01-16 作者:盐城市双鸿电热科技有限公司 点击:

电流热效应原理:电子在电场中得到加速,获得动能,具有速度,然后碰撞其他的微粒(原子,分子,原子团,….)使其他的微粒获得动能,导致平均动能增大,温度升高. 焦耳-楞次定律: 电流通过电阻时,电阻就会发热,将电能转换为热能,这种现象叫做电流的热效应。 焦耳和楞次通过大量的试验,发现电阻通过电流后所产生的热量与电流的平方、电阻及通电时间成正比。这就是是焦耳-楞次定律。 电能转换为热能的关系可用公式表示:Q=(I的二次方)Rt I=电流;R=电阻;t=时间;Q=电阻上产生的热量。

Current heating principle: electronic accelerated in the electric field, gain kinetic energy, has the speed and crash other particles (atoms, molecules, atoms, etc。) Give other particle kinetic energy, which leads to the average kinetic energy increases, the temperature rise。 Joule – lenz’s law: the current through the resistance, the resistance will be fever, converts electrical energy into heat energy, this phenomenon is called the heating effect of the current。 Joule and lenz through a large number of trials, found that the heat generated by the resistance by the current and the square of the current, resistance, and is proportional to the current time。 This is what is the joule – lenz’s law。 Available formula for the relation of the electrical energy is converted to heat energy, said: Q = quadratic (I) Rt I = current; R = resistance; T = time。 Q = the heat generated by the resistance。

现在分别解释一下不同电加热器适应的加热原理:

盐城市双鸿电热科技有限公司


Now to explain the different heating principle of electric heater is used to:

利用电流的焦耳效应将电能转变成热能以加热物体。通常分为直接电阻加热和间接电阻加热。前者的电源电压直接加到被加热物体上,当有电流流过时,被加热物体本身(如电加热熨平机)便发热。可直接电阻加热的物体必须是导体,但要有较高的电阻率。由于热量产生于被加热物体本身,属于内部加热,热效率很高。间接电阻加热需由专门的合金材料或非金属材料制成发热元件,由发热元件产生热能,通过辐射、对流和传导等方式传到被加热物体上。由于被加热物体和发热元件分成两部分,因此被加热物体的种类一般不受限制,操作简便。

The joule effect of using current transform electric energy into heat energy to heat the object. Usually divided into direct resistance heating and indirect resistance heating. Power supply voltage of the former directly to the heated object, when have a current flows through the heated object itself, such as electric heating ironing machine) and fever. Direct resistance heating object must be a conductor, but must have the high resistivity. Due to the heat generated by heated object itself, belongs to the internal heating, high thermal efficiency. Indirect resistance heating should be made of special alloy materials or non-metallic materials, heating element, heat generated by the heating element, through radiation, convection and conduction to the heated object. Because of the heated object is divided into two parts and heating elements, so heated object types is generally not restricted, easy to operate.

间接电阻加热的发热元件所用材料,一般要求电阻率大、电阻温度系数小,在高温下变形小且不易脆化。常用的有铁铝合金、镍铬合金等金属材料和碳化硅、二硅化钼等非金属材料。金属发热元件的最高工作温度,根据材料种类可达1000~1500℃;非金属发热元件的最高工作温度可达1500~1700℃。后者安装方便,可热炉更换,但它工作时需要调压装置,寿命比合金发热元件短,一般用于高温炉、温度超过金属材料发热元件允许最高工作温度的地方和某些特殊场合。

Indirect resistance heating heating element materials, general requirements resistivity, temperature coefficient of resistance small, little deformation at high temperature and not easily embrittlement. Commonly used a iron alloy, nickel chromium alloy and other metal materials and silicon carbide, such as molybdenum disilicide non-metallic materials. The highest working temperature, metal heating element according to the types of materials can reach 1000 ~ 1000 ℃; Non-metallic heating element of the highest working temperature is 1500 ~ 1700 ℃. Which features easy installation, can change hot stove, but it requires pressure regulating device at work, life, shorter than alloy heating elements, commonly used in high temperature furnace, temperature more than metal materials heat element allows the highest working temperature place, and some special occasions.


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