CN113606019A - 一种国六柴油机用可拆卸式尿素混合结构 - Google Patents
一种国六柴油机用可拆卸式尿素混合结构 Download PDFInfo
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Abstract
本发明公开了一种国六柴油机用可拆卸式尿素混合结构,包括进气法兰、混合器筒体、进气隔板、不锈钢缠绕网总成、出气隔板和出气法兰;所述进气法兰和所述出气法兰安装在混合器筒体的两端;所述进气隔板和所述出气隔板均为中部向外隆起的圆形片状结构,所述进气隔板和所述出气隔板径向安装在混合器筒体的中部并形成混合腔体;所述不锈钢缠绕网总成安装在混合腔体中部,将混合腔体分为两个部分;在混合腔体处的混合器筒体外侧安装有喷嘴座;所述混合器筒体上安装有温度传感器底座和压差取气底座。本发明结构紧凑,适用于对结构空间要求比较高的后处理器,可保证尿素与汽车尾气充分混合,明显的降低排气污染物浓度,对于抗尿素结晶方面有显著的效果。
Description
技术领域
本发明属于车用发动机尾气排放净化技术和节能降耗技术领域,特别是涉及国六柴油机用可拆卸式尿素混合结构。
背景技术
目前的国六重型柴油机的主流技术路线为氧化催化单元(DOC)+颗粒捕集单元(DPF)+选择性催化还原转化单元(SCR)和氨氧化催化单元(ASC)串联组合而成,结构布置紧凑,尿素混合距离短,因此国六后处理相比之前国五的混合结构更为复杂,对于抗尿素结晶的要求更高。为满足国六柴油车的需求,需要设计一种结构体积相对更小、尿素混合更均匀的混合结构。
发明内容
本发明提供一种国六柴油机用可拆卸式尿素混合结构,此混合器结构紧凑,广泛适应于国六后处理器的布置,尤其是对结构空间要求比较高的后处理器,可保证尿素与汽车尾气充分混合,明显的降低排气污染物浓度,而且对于抗尿素结晶方面有显著的效果。
本发明采用的技术方案为:一种国六柴油机用可拆卸式尿素混合结构,包括进气法兰、混合器筒体、进气隔板、不锈钢缠绕网总成、出气隔板和出气法兰;所述进气法兰和所述出气法兰安装在混合器筒体的两端;所述进气隔板和所述出气隔板均为中部向外隆起的圆形片状结构,所述进气隔板和所述出气隔板径向安装在混合器筒体的中部并形成混合腔体;所述不锈钢缠绕网总成安装在混合腔体中部,将混合腔体分为两个部分;在混合腔体处的混合器筒体外侧安装有喷嘴座;所述混合器筒体上安装有温度传感器底座和压差取气底座。
进一步,所述进气隔板和所述出气隔板上分别开有若干个进气孔和出气孔,用于进气和出气扰流。
进一步,所述进气隔板和所述出气隔板的边缘处设有翻边,便于与混合器筒体焊接。
进一步,所述不锈钢缠绕网总成由不锈钢丝缠绕网和外层固定管组成,所述不锈钢丝缠绕网由圆柱形的不锈钢丝网经过波浪形压痕后缠绕而成。
本发明产生的有益效果是:
1、进气隔板和出气隔板可采用同一套模具加工而成,经济型好;
2、装配结构简单,进出气隔板和不锈钢缠绕网总成焊接后可整体塞入筒体,提高生产效率;
3、占用空间小,适用范围广,可通过调整筒体和混合腔体直径适用于各种后处理器布置;
4、尿素混合更均匀,结晶风险更低,尾气中氮氧化物转化效率更高;
5、拆卸方便,可维护性好。
附图说明
下面结合附图对本发明进一步说明。
图1为混合结构的进气方向整体示意图;
图2 为混合结构的出气方向整体示意图;
图3为混合结构内部示意图;
图4 为混合腔体进气端的结构示意图;
图5 为混合腔体出气端的结构示意图;
图6 为混合腔体的轴测图;
图7为不锈钢缠绕网总成的结构示意图;
图8为不锈钢缠绕网总成的侧向剖视图;
图中:1-进气法兰、2-进气隔板、3-不锈钢缠绕网总成、4-混合器筒体、5-出气隔板、6-出气法兰、7-喷嘴座、8-压差取气底座、9-温度传感器底座、10-不锈钢丝缠绕网、11-外层固定管。
具体实施方式
下面结合附图和具体实施例对本发明作进一步的描述。
如图1和图2所示,本发明提供了一种国六柴油机用可拆卸式尿素混合结构,混合结构布置于颗粒捕集器后端,选择性催化还原转化器前端,尾气经由颗粒捕集器后直接进入混合器内与尿素喷雾发生混合。
如图3所示,所述混合器包括进气法兰1、进气隔板2、不锈钢缠绕网总成3、混合器筒体4、出气隔板5、出气法兰6、喷嘴座7、压差取气底座8和温度传感器底座9。
进气法兰1和出气法兰6分别焊接在混合器筒体4的两端,进气法兰1和出气法兰6均为可拆卸式法兰,便于后期拆卸和维护。进气隔板2和出气隔板5均为中部向外隆起的圆形片状结构,进气隔板2和出气隔板5径向拼装在混合器筒体4的中部并形成圆柱形的混合腔体,进气隔板2和出气隔板5的边缘处设有翻边,如图6所示,便于焊接在混合器筒体4中。如图4和图5所示,进气隔板2和出气隔板5上分别开有两个进气孔和出气孔,用于进气扰流和出气扰流。压差取气底座8和温度传感器底座9安装在混合器筒体4上,便于测试颗粒捕集器后端压力和监控排气温度,更好的控制尿素喷射量。
如图7和图8所示,不锈钢缠绕网总成3由不锈钢丝缠绕网10和外层固定管11采用钎焊工艺焊接而成,不锈钢丝缠绕网10由圆柱形的不锈钢丝网经过波浪形压痕后缠绕而成。通过对外层固定管11的外侧进行焊接,将不锈钢缠绕网总成3固定在混合腔体中,使混合腔体一分为二。同时,不锈钢丝缠绕网10也可以采用泡沫金属、金属载体等高孔隙率结构进行替换。
在混合腔体处的混合器筒体4外侧安装有喷嘴座7,当混合腔体整体压装入混合器筒体4后,使得混合腔体的中心线与喷嘴座7中心线重合。压差取气底座8、温度传感器底座9焊接于混合器筒体4上;出气隔板后可根据需要增加扰流板提升流场均匀性。
本发明在使用时,尾气经过颗粒捕集器后,通过进气隔板2上进气孔一分为二后进入混合腔体,尾气在混合腔体内与安装在喷嘴座7上喷嘴喷射出的尿素溶液相互混合,共同经过不锈钢丝缠绕网10。当混合气体通过不锈钢丝缠绕网10时,高温的不锈钢缠绕网使得液态的尿素溶液进一步的破碎、蒸发,水解为氨气,尾气与氨气混合后在混合腔体下方扰流,经出气隔板5下方的出气孔分流至两侧绕出,该方式可增加尾气与氨气的混合距离,从而使液态喷雾与气态尾气充分混合后由出气端排向后端的选择性催化还原转化单元,进行后续催化反应。
要说明的是,上述实施例是对本发明技术方案的说明而非限制,所属技术领域普通技术人员的等同替换或者根据现有技术而做的其它修改,只要没超出本发明技术方案的思路和范围,均应包含在本发明所要求的权利范围之内。
Claims (4)
1.一种国六柴油机用可拆卸式尿素混合结构,包括进气法兰、混合器筒体、进气隔板、不锈钢缠绕网总成、出气隔板和出气法兰;其特征在于:所述进气法兰和所述出气法兰安装在混合器筒体的两端;所述进气隔板和所述出气隔板均为中部向外隆起的圆形片状结构,所述进气隔板和所述出气隔板径向安装在混合器筒体的中部并形成混合腔体;所述不锈钢缠绕网总成安装在混合腔体中部,将混合腔体分为两个部分;在混合腔体处的混合器筒体外侧安装有喷嘴座;所述混合器筒体上安装有温度传感器底座和压差取气底座。
2.根据权利要求1所述的一种国六柴油机用可拆卸式尿素混合结构,其特征在于:所述进气隔板和所述出气隔板上分别开有若干个进气孔和出气孔,用于进气和出气扰流。
3.根据权利要求1所述的一种国六柴油机用可拆卸式尿素混合结构,其特征在于:所述进气隔板和所述出气隔板的边缘处设有翻边,便于与混合器筒体焊接。
4.根据权利要求1所述的一种国六柴油机用可拆卸式尿素混合结构,其特征在于:所述不锈钢缠绕网总成由不锈钢丝缠绕网和外层固定管组成,所述不锈钢丝缠绕网由圆柱形的不锈钢丝网经过波浪形压痕后缠绕而成。
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CN113217150A (zh) * | 2021-06-18 | 2021-08-06 | 郑州精益达环保科技有限公司 | 一种柴油机后处理混合结构 |
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