CN110843510A - 新型orvr蒸汽回收油管总成 - Google Patents
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Abstract
本发明公开了一种新型ORVR蒸汽回收油管总成,包括燃油箱,所述燃油箱上连通有金属加油管和通气管,所述金属加油管的进口处设置有集油盘,金属加油管的内腔中设置有加油喉管,所述通气管出口处设置有空气过滤器,还包括:一循环管,所述循环管一端与燃油箱相连通,另一端与金属加油管的进口端相连通,用于平衡加油时燃油箱内的燃油蒸汽压力。本发明通过增设循环管,并合理设计加油管的空间角度、走向、管子直径、长度等参数,使燃油箱内的蒸汽压力在加油过程中始终合理且受控,呈现一种稳定液封的状态,从而保证油、汽在管路中按设计方向流动,既能够实现顺利加油的目的,又能够防止燃油蒸汽排放超标。
Description
技术领域
本发明涉及汽车加油技术领域,尤其是涉及一种新型ORVR蒸汽回收油管总成。
背景技术
ORVR(Onboard Refueling Vapor Recovery)即车载加油油气回收系统,是一种车辆排放控制系统,它能够收集加油过程中油箱内挥发的燃油蒸汽。具体地,在燃油箱上同时设置加油管和通气管,加油过程中,当燃油箱内内压增加时,燃油蒸汽可通过通气管向外界释压。同时为了使在发动机运行过程中流向碳罐的新鲜空气干净,避免空气中的灰尘进入碳罐和发动机中,设想在通气管的出口处加装空气过滤器。然而,采用上述结构的ORVR系统在进行模拟加油实验时,发现加油管内的燃油蒸汽压力极为不稳,经常出现加油不畅、或者燃油蒸汽从加油口逸出、甚至液体燃油直接从加油口喷出等不良现象,不仅不能消除燃油蒸汽对环境的影响,而且还会影响正常的加油操作。
发明内容
为了解决上述问题,本发明提供一种新型结构简单、液封稳定的ORVR蒸汽回收油管系统,具体采取如下技术方案:
本发明所述的新型ORVR蒸汽回收油管总成,包括燃油箱,所述燃油箱上连通有金属加油管和通气管,所述金属加油管的进口处设置有集油盘,金属加油管的内腔中设置有加油喉管,所述通气管出口处设置有空气过滤器,还包括:
一循环管,所述循环管一端与燃油箱相连通,另一端与金属加油管的进口端相连通,用于平衡加油时燃油箱内的燃油蒸汽压力。
优选地,所述循环管的内径为4-6mm,且所述金属加油管的内径为25-26mm;
所述金属加油管包括自上而下设置的喉管段、第一段、第二段、第三段;所述喉管段用于容纳同轴设置的加油喉管,所述加油喉管的中心轴与铅垂线的夹角为55-60°,且加油喉管的下沿距离燃油箱顶面的垂直高度为300-500mm;所述第一段的长度为155±10mm,其中心轴与铅垂线的夹角为53±3°;所述第二段的长度为135±10mm,其中心轴与铅垂线的夹角为80±3°;所述第三段的长度为120±10mm,其中心轴与铅垂线的夹角为6±2°;所述喉管段、第一段、第二段、第三段之间均通过R80±10mm的弯头连接;
加油开始时,金属加油管内的油气混合率为零;4-5秒后,金属加油管内的油气混合率保持在94-95%。
进一步地,所述金属加油管的内径为25.4mm,循环管的内径为4.95mm;
所述加油喉管的中心轴与铅垂线的夹角为60°,加油喉管的下沿距离伸入燃油箱内的进油管末端的垂直高度为325mm。
所述金属加油管和循环管均通过橡胶管与燃油箱相连通。
所述空气过滤器通过橡胶管与通气管相连通。
所述加油喉管和金属加油管之间设置有密封圈。
本发明提供的新型ORVR蒸汽回收油管总成,通过增设循环管,并合理设计加油管的空间角度、走向、管子直径、长度等参数,使燃油箱内的蒸汽压力在加油过程中始终合理且受控,呈现一种稳定液封的状态,从而保证油、汽在管路中按设计方向流动,既能够实现顺利加油的目的,又能够防止燃油蒸汽排放超标。
附图说明
图1a、1b、1c是本发明的结构示意图(省略燃油箱)。
图2是图1a的剖面图(金属加油管进口部分)。
图3是加油4.93秒时金属加油管内的油气混合率图例。
图4是加油过程中金属加油管内的燃油蒸汽压力-时间图。
具体实施方式
下面结合附图对本发明的实施例作详细说明,本实施例给出了详细的实施方式,并以本发明的技术方案为前提进行实施,但本发明的保护范围不限于下述实施例。
如图1a、1b、1c所示,本发明所述的新型ORVR蒸汽回收油管总成,包括燃油箱1及其上连通的金属加油管2、通气管3和循环管4,金属加油管2和循环管4均通过橡胶管与燃油箱1相连通。
上述金属加油管2的内径为25-26mm,其包括自上而下设置的喉管段、第一段、第二段、第三段。其中,喉管段用于容纳同轴设置的加油喉管5(见图2),加油喉管5的中心轴与铅垂线的夹角为55-60°,且加油喉管5的下沿距离燃油箱顶面的垂直高度为300-500mm;第一段的长度为155±10mm,其中心轴与铅垂线的夹角为53±3°;第二段的长度为135±10mm,其中心轴与铅垂线的夹角为80±3°;第三段的长度为120±10mm,其中心轴与铅垂线的夹角为6±2°;上述喉管段、第一段、第二段、第三段之间均通过R80±10mm的弯头连接;为了避免发生跑冒滴漏现象,在加油喉管5和金属加油管2之间加装有密封圈6;为了方便将本发明固定在车体上,在金属加油管2的进口处安装有集油盘7,在金属加油管2的中部安装有固定卡8。
一般地,在通气管3的出口端安装有空气过滤器9,空气过滤器通过橡胶管与通气管3相连通,用于在发动机运行过程中,对流向碳罐空气进行过滤,避免空气中的灰尘进入碳罐和发动机中。
循环管4则用于平衡加油时燃油箱1内的燃油蒸汽压力,其头部连通在金属加油管2的喉管段,且与加油喉管5的外壁相对应;且当金属加油管的内径为25-26mm时,循环管的内径为4-6mm。
优选地,当金属加油管2的内径为25.4mm时,循环管4的内径为4.95mm;且加油喉管5的中心轴与铅垂线的夹角为60°,加油喉管5的下沿距离伸入燃油箱1内的进油管末端的垂直高度为325mm,金属加油管2其余三段的空间走向和长度按前述范围进行选取。
采用上述优选方案的本发明对燃油箱1进行加油时,如图3所示,金属加油管2内的油气混合率从零开始迅速增加;加油进行到4.93秒,金属加油管2内的油气混合率达到95%,此时,可认为金属加油管2内形成了“有效液封”,之后,持续保持该比率。从同步监测的压力-时间曲线图(见图4)可以看出,当加油进行到5秒时,燃油箱1内的燃油蒸汽压力达到了最大值,而后压力缓慢下降,表明在加油过程中,系统中的气体已建立起正常的流动(即达到“有效液封”状态)。在此状态下,加油时的油气压力和流动过程均处于受控的稳定状态,油、汽在管路中均按设计的方向流动:燃油能够从金属加油管2顺利流入到燃油箱1内,同时使得燃油蒸汽和空气的混合气体在该压力作用下流向碳罐,经过碳罐中的活性炭过滤后,汽油蒸汽被吸附,干净的空气经通气管3和空气过滤器9排出到大气中,充分避免了加油不畅、燃油蒸汽从加油口逸出、甚至液体燃油直接从加油口喷出等不良现象,并达到了控制燃油蒸汽绿色排放的目的。
Claims (6)
1.一种新型ORVR蒸汽回收油管总成,包括燃油箱,所述燃油箱上连通有金属加油管和通气管,所述金属加油管的进口处设置有集油盘,金属加油管的内腔中设置有加油喉管,所述通气管出口处设置有空气过滤器,其特征在于:还包括:
一循环管,所述循环管一端与燃油箱相连通,另一端与金属加油管的进口端相连通,用于平衡加油时燃油箱内的燃油蒸汽压力。
2.根据权利要求1所述的新型ORVR蒸汽回收油管总成,其特征在于:
所述循环管的内径为4-6mm,且所述金属加油管的内径为25-26mm;
所述金属加油管包括自上而下设置的喉管段、第一段、第二段、第三段;所述喉管段用于容纳同轴设置的加油喉管,所述加油喉管的中心轴与铅垂线的夹角为55-60°,且加油喉管的下沿距离燃油箱顶面的垂直高度为300-500mm;所述第一段的长度为155±10mm,其中心轴与铅垂线的夹角为53±3°;所述第二段的长度为135±10mm,其中心轴与铅垂线的夹角为80±3°;所述第三段的长度为120±10mm,其中心轴与铅垂线的夹角为6±2°;所述喉管段、第一段、第二段、第三段之间均通过R80±10mm的弯头连接;
加油开始时,金属加油管内的油气混合率为零;4-5秒后,金属加油管内的油气混合率保持在94-95%。
3.根据权利要求1所述的新型ORVR蒸汽回收油管总成,其特征在于:
所述金属加油管的内径为25.4mm,循环管的内径为4.95mm;
所述加油喉管的中心轴与铅垂线的夹角为60°,加油喉管的下沿距离伸入燃油箱内的进油管末端的垂直高度为325mm。
4.根据权利要求1所述的新型ORVR蒸汽回收油管总成,其特征在于:所述金属加油管和循环管均通过橡胶管与燃油箱相连通。
5.根据权利要求1所述的新型ORVR蒸汽回收油管总成,其特征在于:所述空气过滤器通过橡胶管与通气管相连通。
6.根据权利要求1所述的新型ORVR蒸汽回收油管总成,其特征在于:所述加油喉管和金属加油管之间设置有密封圈。
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