净化铝材配件-汽车净化器封装功能的浅析
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- 发布日期：2017-04-13 16:30:26
含铅汽油中的添加剂就是这样污染催化剂的。含铅汽油中的铅也会污染催化剂，它会覆盖住整个催化剂表面使催化反应无法进行，因此必须使用无铅汽油。为了降低阻力，三元净化器设计成椭圆形或圆柱形。将金属壳体、陶瓷载体和热膨胀垫组装在一起进行焊接。封装的主要功能是在排气系统振动和气体压力作用的情况下，仍将催化剂载体固定住。
The additive in leaded gasoline is the catalyst for such pollution. Lead is also a catalyst for lead in gasoline, which covers the entire surface of the catalyst so that the catalytic reaction can not be carried out, and therefore must be used in the use of lead-free gasoline. In order to reduce the resistance, the design of the three element into oval or cylindrical. The metal case, the ceramic carrier and the thermal expansion pad are assembled together for welding. The main function of the package is the vibration of the exhaust system and the role of gas pressure, the catalyst carrier is still fixed.
a.半壳体净化器。金属壳体由两个椭圆半壳体、催化剂载体和一个衬垫焊接而成。
A. half shell purifier. The metal shell is welded with a metal shell, a catalyst carrier and a liner, which is composed of two elliptical shells.
b.卷筒式净化器。金属壳体是由一个金属板、催化剂载体和衬垫卷制焊接而成。
B. drum type purifier. Metal shell is welded with a metal plate, catalyst carrier and a pad.
上、下壳体的主要工艺流程为剪料——拉延——二次拉延——翻边、成形——修边。废气转化率达到50%的温度叫起活温度，一般在200—250℃左右。为了使冷起动后尽快达到起活温度，就必须设法保证废气在进入净化器的途中尽量减少热量损失。连接发动机排气歧管和净化器的下行管采用双层管空气隔离，可以减少散热量，加快起动。弯制下行管可采用灌沙或加水冰冻的方法。
The main process, a shear material -- -- two -- drawing drawing, flanging forming -- trimming. Waste gas conversion rate reached 50% of the temperature is called the live temperature, generally at 250 - 200. In order to make the cold start up as soon as possible to reach the living temperature, it must try to ensure that the exhaust gas in the way into the purifier to minimize heat loss. Connecting the engine exhaust manifold and the air purifier of the downstream pipe with double pipe air separation, can reduce the heat dissipation, accelerate the start. The method of filling sand or water ice can be used in the bending down pipe.
根据排量，可以设计成单流道排气系统或双流道排气系统。影响净化器寿命的主要因素：a.铅、镁等元素毒化催化剂中的贵金属。b.过热。这是在高于800—1000℃的高温下，因活性层组成物的烧结而引起的。理想温度是400—800℃。c.机械损伤。这是由金属疲劳引起壳体开裂、陶瓷载体振碎而造成的。d.微粒堵塞排气通道。
According to the displacement, it can be designed into a single channel exhaust system or dual channel exhaust system. Main factors affecting the life of the purifier: A. lead, magnesium and other elements of the noble metal catalyst poisoning. B. overheating. This is caused by the sintering of the active layer at high temperatures above 800 to 1000. Ideal temperature is 400 - 800. C. mechanical damage. This is caused by metal fatigue caused by shell cracking, ceramic carrier vibration caused by. D. particulate plug exhaust channel.
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