The invention discloses a fuel cycle structure of an electronically controlled monomer pump, which comprises a pump body, an electromagnet placed on the top of the pump body and electrically attracted upward movement under the control of a diesel engine ECU, an upper valve seat assembled in the pump body, a stem assembly (3) assembled in the upper valve seat and connected with the armature, a sealing ball located between the limit ball seat and the lower valve seat, and a neck section shaft of the stem assembly (3). The end conical surface is connected with the inner conical surface of the lower port of the upper seat to form a sealing surface, and the downward part forms an oil passage for the necking of the valve stem. Its characteristics are as follows: one side of the pump body is provided with an oil return joint 2 (6), and the side wall of the pump body is provided with a through hole connecting the necking section of the stem assembly (3) and the oil return joint 2 (6). When the injection quantity meets the requirement of diesel engine, the through-hole flow of high-pressure fuel through the throttle passage of the valve stem and the side wall of the pump body flows out of the pump body through the return joint II (6), eliminating the hydraulic pressure fluctuating on the armature and the valve stem assembly (3), and improving the stability of the oil quantity of the pump.
【技术实现步骤摘要】
一种电控单体泵燃油循环结构所属
本专利技术涉及一种电控单体泵燃油循环结构。
技术介绍
目前,公知的风冷单缸柴油机电控单体泵,如图2所示,具有一个置于泵体顶部在柴油发动机ECU的控制下通电吸引衔铁向上运动的电磁铁、装配在泵体内的上阀座、装配在上阀座中的与衔铁连接的阀杆组件3及坐落在限位球座和下阀座之间的密封球,阀杆组件3的圆柱面与上阀座中心孔同径,形成密封面;阀杆组件3缩颈段轴端圆锥面上行与上阀座下部端口的内圆锥面贴合形成密封面,下行形成阀杆缩颈油路通道,下阀座开有中心通道且中心通道下部开有圆锥阀门孔,圆锥阀门孔与密封球形成球形阀门,进油接头4连通下阀座中心通道,回油接头一1装在泵体上端的电磁铁上,在电磁铁与阀杆间设置垫片式油量调节机构2,垫片式油量调节机构2包括设置在电磁铁上的垫片以及装在所述的垫片与伸出衔铁的阀杆组件3顶端间的弹簧。风冷单缸柴油机电控单体泵燃油循环结构如图2和图3所示,在柱塞向下运动过程中,此时,电磁铁保持通电使阀杆组件3缩颈段轴端圆锥面上行与上阀座下部端口的内圆锥面贴合形成密封面,燃油从进油接头4进入泵体,经过低压油道从下阀座上开启的球形阀门流入柱塞腔;在柱塞向上运动过程中,柱塞腔内的燃油被压缩到喷油器油道,燃油进入高压油管,当油压大于喷油嘴的开启压力时,喷油开始;当喷油量达到柴油发动机需要,电磁铁在柴油发动机ECU的控制下断电,垫片式油量调节机构2的弹簧推动阀杆组件3向下运动,使阀杆组件3缩颈段轴端圆锥面离开上阀座下部端口的内圆锥面,形成阀杆缩颈油路通道,高压燃油经锥形阀门流经阀杆组件3、垫片式油量调节机构2,由回油接头一1离开,当泵 ...
【技术保护点】
1.一种电控单体泵燃油循环结构,包括泵体、置于泵体顶部在柴油发动机ECU的控制下通电吸引向上运动的电磁铁、装配在泵体内的上阀座、装配在上阀座中的与衔铁连接的阀杆组件(3)及坐落在限位球座和下阀座之间的密封球,阀杆组件(3)缩颈段轴端圆锥面上行与上阀座下部端口的内圆锥面贴合形成密封面,下行形成阀杆缩颈油路通道,下阀座开有中心通道且中心通道下部开有圆锥阀门孔,圆锥阀门孔对中密封球,进油接头(4)通过低压油道连通下阀座中心通道,其特征在于:所述的泵体一侧设置回油接头二(6),在所述的泵体侧壁设置有连通阀杆组件(3)缩颈段和回油接头二(6)的通孔。
【技术特征摘要】
1.一种电控单体泵燃油循环结构,包括泵体、置于泵体顶部在柴油发动机ECU的控制下通电吸引向上运动的电磁铁、装配在泵体内的上阀座、装配在上阀座中的与衔铁连接的阀杆组件(3)及坐落在限位球座和下阀座之间的密封球,阀杆组件(3)缩颈段轴端圆锥面上行与上阀座下部端口的内圆锥面贴合形成密封面,下行形成阀杆缩颈油路通道,下阀座开有中心通道且中心通道下部开有圆锥阀门孔,圆锥阀门孔对中密封球,进油接头(4)通过低压油道连通下阀座中心通道,其特征在于:所述的泵体一侧设置回油接头二(6...
【专利技术属性】
技术研发人员:胡逍宇,龙再冬,李大勇,唐任宏,朱元宪,简涛,
申请(专利权)人:成都威特电喷有限责任公司,
类型:发明
国别省市:四川,51
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