凈化鋁材配件-汽車凈化器封裝功能的淺析
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- 發(fā)布日期：2017-04-13 16:30:26
含鉛汽油中的添加劑就是這樣污染催化劑的。含鉛汽油中的鉛也會(huì)污染催化劑，它會(huì)覆蓋住整個(gè)催化劑表面使催化反應(yīng)無法進(jìn)行，因此必須使用無鉛汽油。為了降低阻力，三元凈化器設(shè)計(jì)成橢圓形或圓柱形。將金屬殼體、陶瓷載體和熱膨脹墊組裝在一起進(jìn)行焊接。封裝的主要功能是在排氣系統(tǒng)振動(dòng)和氣體壓力作用的情況下，仍將催化劑載體固定住。
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.半殼體凈化器。金屬殼體由兩個(gè)橢圓半殼體、催化劑載體和一個(gè)襯墊焊接而成。
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.卷筒式凈化器。金屬殼體是由一個(gè)金屬板、催化劑載體和襯墊卷制焊接而成。
B. drum type purifier. Metal shell is welded with a metal plate, catalyst carrier and a pad.
上、下殼體的主要工藝流程為剪料——拉延——二次拉延——翻邊、成形——修邊。廢氣轉(zhuǎn)化率達(dá)到50%的溫度叫起活溫度，一般在200—250℃左右。為了使冷起動(dòng)后盡快達(dá)到起活溫度，就必須設(shè)法保證廢氣在進(jìn)入凈化器的途中盡量減少熱量損失。連接發(fā)動(dòng)機(jī)排氣歧管和凈化器的下行管采用雙層管空氣隔離，可以減少散熱量，加快起動(dòng)。彎制下行管可采用灌沙或加水冰凍的方法。
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.
根據(jù)排量，可以設(shè)計(jì)成單流道排氣系統(tǒng)或雙流道排氣系統(tǒng)。影響凈化器壽命的主要因素：a.鉛、鎂等元素毒化催化劑中的貴金屬。b.過熱。這是在高于800—1000℃的高溫下，因活性層組成物的燒結(jié)而引起的。理想溫度是400—800℃。c.機(jī)械損傷。這是由金屬疲勞引起殼體開裂、陶瓷載體振碎而造成的。d.微粒堵塞排氣通道。
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.
