CN112984162A - 一种挡铁与极靴带卸荷功能的溢流型反比例减压电磁阀 - Google Patents
一种挡铁与极靴带卸荷功能的溢流型反比例减压电磁阀 Download PDFInfo
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Abstract
本发明涉及一种挡铁与极靴一体的带卸荷功能的溢流型反比例减压电磁阀包括:调节螺钉,垫片,挡铁,薄膜,衔铁,阀体,轴承,顶杆,阀座,钢球,球阀体,安装阀体,出口滤网,球阀座,进口滤网,O形圈,线圈,调节弹簧,轭铁和接插件。该挡铁与极靴一体的带卸荷功能溢流型反比例减压电磁阀,调节精度高,压力波动小,使用寿命长,抗污染能力好,制造工艺性好。
Description
技术领域
本发明专利涉及一种溢流型反比例减压电磁阀,尤其是用于车辆液压系统的精确压力控制的带卸荷功能的溢流型反比例减压电磁阀。
背景技术
反比例减压阀在车辆液压系统中大量使用,用于控制液体压力驱动机械结构工作。总体来说反比例减压阀分为三大类,直动式反比例减压电磁阀、溢流型反比例减压电磁阀和先导式反比例减压电磁阀,其中先导式反比例电磁阀可以认为是溢流型减压阀和直动式减压阀组合所得。
在车辆液压系统中,泵一般由发动机直接驱动,发动机转速不同时,油泵供油压力也不同。而液压系统一般都在设计时预定了工作压力,当油泵压力过高时要对液压系统压力进行泄压以保证液压系统的安全。常规的做法是在液压系统中设置专门用于系统安全保护的主油压控制电磁阀,用于控制系统主油压。而主油压系统电磁阀后连接的各种液压电磁阀,一般不具有调节供给油路油压的作用,仅能调节电磁阀出口的压力。
中国专利申请号 201410007875.4的发明专利给出了典型的先导式比例电磁阀的结构。中国专利申请号 201310348665.7给出了一种典型的溢流型反比例减压电磁阀的结构。中国专利申请号 201310348665.7给出了一种典型的直动式反比例减压电磁阀的结构。
但是上述结构均不能实现油源压力过高时对系统卸荷以保护液压系统的功能,并且存在使用范围受限,压力调节精度不高,抗污染能力不强,制造过程控制难度高等缺点。
发明内容
为了解决现有反比例减压电磁阀不能卸荷对系统提供保护等问题,本发明专利目的是提供一种调节精度高,压力波动小,使用寿命长,抗污染能力强,制造工艺性好的挡铁与极靴一体的带卸荷功能的溢流型反比例减压电磁阀。
为实现本发明的技术目的,本发明采用的技术方案是:(详见权利要求书)
本发明专利所具有的优点:
1、本发明专利采用挡铁与极靴一体式的比例电磁铁结构,磁能利用率高,电磁阀结构紧凑,体积小。
2、本发明专利采用挡铁与极靴一体式的比例电磁铁结构,采用薄膜和衔铁组成摩擦副,摩擦系数小,电磁阀调压性能优良。
3、本发明专利采用挡铁与极靴一体式的比例电磁铁结构,采用薄膜和衔铁组成摩擦副,抗污染能力好。
4、本发明专利采用挡铁与极靴一体式的比例电磁铁结构,电磁阀组装稳定性好,批量生产产品散差小。
5、本发明专利采用顶杆、阀座、球阀座和钢球组成溢流阀结构,抗污染能力强,产品组装稳定,批量生产工艺性好。
6、本发明专利采用,衔铁与薄膜组成摩擦副,顶杆与轴承组成摩擦副,金属材质的顶杆、阀座、球阀座和钢球组成溢流阀结构,产品寿命长。
附图说明
图1为本发明专利一种挡铁与极靴一体的带卸荷功能的溢流型反比例减压电磁阀的结构原理图;
图2为本发明专利一种挡铁与极靴一体的带卸荷功能的溢流型反比例减压电磁阀工作时的油路原理图。
图3为本发明专利一种挡铁与极靴一体的带卸荷功能的溢流型反比例减压电磁阀的工作原理图。
其中附图标记为:1-调节螺钉,2-垫片,3-挡铁,3a-上锥面,3b-圆柱段,3c-下锥面,4-薄膜,5-衔铁,6-阀体,6a-回油口,7-轴承,8-顶杆,9-阀座,9a-分液孔,9b-溢流孔,10-钢球,11-球阀体,11a-进液口,11b-出液孔,12-安装阀体,12a-进口,12b-出口,13-出口滤网,14-球阀座,15-进口滤网,16-O形圈,17-线圈,18-调节弹,19-轭铁,20-接插件。
具体实施方式
下面将结合附图对本发明作进一步说明。
参阅附图1,本发明提供一种挡铁与极靴一体的带卸荷功能的溢流型反比例减压电磁阀,由调节螺钉1,垫片2,挡铁3,薄膜4,衔铁5,阀体6,轴承7,顶杆8,阀座9,钢球10,球阀体11,安装阀体12,出口滤网13,球阀座14,进口滤网15,O形圈16,线圈17,调节弹簧18,轭铁19和接插件20组成。
调节螺钉1圆柱面设置有螺纹,下端设置有凸起小圆锥,由金属材料构成,安装于挡铁3螺纹孔内,下部将调节弹簧18压紧。垫片2为圆环型薄片,由非导磁金属材料构成,放置于挡铁3大孔内。挡铁3为多段圆柱结构,上端设置有内螺纹,内螺纹下端连接大孔贯通挡铁,外圆柱面上从上到下设置相连的上锥面3a,圆柱面3b和下锥面3c,由软磁材料构成,上端与轭铁19贴合,下端与阀体6内孔贴合。
薄膜4为薄壁圆筒形,由耐磨、耐高温塑料构成,放置于挡铁3内孔,套接在衔铁5圆柱面上。衔铁5为圆柱形,内设通孔,由软磁材料构成,上端与调节弹簧18贴合,下端与顶杆8贴合。阀体6为多段圆柱形,内设连通的小孔与大孔,径向设置有溢流回油口6a,由软磁材料构成,上端大圆柱与轭铁19铆接,下端与安装阀体12可靠连接。
轴承7为圆柱形,内设通孔,由耐磨材料构成,安装于阀体6内孔,套接在顶杆8外圆面上。顶杆8为多段圆柱形,上端设置有垂直于圆柱径向的半圆形槽8a,中间设置有工作面8b,由金属材料构成。
阀座9为圆柱形,内设连通的分液孔9a与溢流孔9b,由金属材料构成,上端与顶杆8上的工作面8b贴合,下端与球阀座11紧密连接,外圆紧密安装在阀体6内孔中。
钢球10为球型,由金属材料构成,安装于球阀座11内孔中,且钢球可往复运动。球阀座11为多段圆柱形,圆柱中心设置有连通的3段台阶孔,径向设置有进液孔11a,进液孔11a与通过中心的3段台阶孔连通,沿轴线方向设置有2个偏心出液孔11b,出液孔贯通球阀座,出液孔与三段台阶孔不连通,由金属材料构成,上端与阀座9连接成一体后,安装于阀体6内孔中。安装阀体12为带沟槽的多段圆柱结构,内设短圆柱孔,侧面设置有进口12a,端面设置有出口12b,由耐高温塑料构成,可靠套接在阀体6上,且与球阀座11形成可靠密封。
出口滤网13为多孔薄片,由金属材料构成,安装于安装阀体12内。球阀座14为多段圆柱结构,由金属构成,紧密安装于球阀体11内孔中。进口滤网15为薄壁圆筒形,由金属和塑料构成,套接在安装阀体12上设置的进口12a处。O形圈16为环型,横截面为圆形,由耐高低温橡胶构成,套接在安装阀体12的外圆上。调节弹簧18为圆柱压缩弹簧,由金属材料构成,安装于档铁3级衔铁5内,上部与调节图案黄18紧贴,下部与衔铁6台阶孔底部紧贴。
线圈17为圆柱形,内设通孔,由塑料和漆包线构成,上端与轭铁贴合,下端与阀体6贴合。轭铁19为圆柱形,内设连通的小孔与大孔,由软磁材料构成。接插件20根据安装要求而确定形状,由塑料和金属构成,接插件20与线圈17可靠连接并且与轭铁19可靠固定。
挡铁3上的上锥面3a,圆柱段3b,下锥面3c以及大孔底部共同与衔铁5组成比例电磁铁中的磁分路器结构(即传统意义上的挡铁、极靴和衔铁结构),在线圈17接受输入电信号产生磁场后,比例电磁铁输出电磁吸力作用在衔铁5上并通过克服调节弹簧18的弹力减小顶杆8作用在钢球10上的力。顶杆8与阀座9在阀座9上端面组成溢流阀工作。当入口压力过高时,顶杆8与阀座9以及钢球10和球阀座11组成卸荷阀工作,对供油油路进行泄压,以降低入口压力维护系统安全。
结合图2对本发明进行进一步描述。所述的一种挡铁与极靴一体的带卸荷功能的溢流型反比例减压电磁阀工作时,液体经安装阀体12上的进口12a输入到球阀座14内的进液孔12a后再进入球阀座11轴线的三段台阶孔中,经钢球10与球阀座11内孔的间隙流经球阀座11上端的小孔后,进入阀座9内分液孔9a,一部分液体流经球阀座11内的出液孔11b,进入安装阀体12下端孔内,经出口12b流出成为需要的驱动液体。另外一部分液体,经阀座9内的溢流孔9b流向顶杆8上的工作面8b,后流入阀体6内部的孔中,经阀体6上设置的回油口6a排出。
结合附图3对本发明进行进一步说明。电磁阀不通电时,液体流经钢球10与球阀座11内孔的间隙流经球阀座11上端的小孔时,由于钢球10与球阀座11内孔的间隙而限流.钢球10由于和顶杆8接触,形成进口压力作用在钢球10上形成等效的球阀座11限流处入口压力作用在钢球上的等效液压反馈面积,进口压力作用在等效液压反馈面积上形成方向向上的进口压力液压力。由于阀座9内的分液孔9a流道面积显著大于球阀座11上部小孔面积并且分液孔9a连通球阀座11上的出液孔11b,分液孔9a内压力低于进口压力,该压力作用在顶杆上形成等效面积,形成向上的液压力,该液压力与进口压力液压力形成合力共同作用在顶杆8上,该合力大于调节弹簧18的弹簧力从而顶杆8和衔铁5向上运动,压缩调节弹簧18。顶杆8向上运动后,液体流入阀体6内孔并经回油口6a排出,从而分液孔9a内压力降低,导致向上的该液压力与进口压力液压力的合力小于向下调节弹簧的弹簧力,衔铁5和顶杆8向下运动,顶杆8工作面8b与阀座9上端面距离减小,经溢流孔9b流向回油口6a的液体减少,分液孔9a内压力升高,重复前述往复运动,从而分液孔9a内压力达到一相对稳定的压力值,由于分液孔9a与球阀座11上的出液孔11b以及安装阀体12内孔(即出口)相连并且无任何节流及限流,因此分液孔压力与安装阀体12内孔(即出口)压力相等,为。
电磁阀平衡方程为:
从而得到:
电磁阀平衡方程为:
上式中,K为比例电磁铁系数,I为输入等效电流。
从而得到:
当入口压力过高,进口液压反馈力大于调节弹簧的弹簧力。如前述电磁阀工作原理,电磁阀不通电时,顶杆受到向上的进口液压反馈力出口压力反馈力形成共同合力大于向下的调节弹簧的弹簧力,顶杆8向上运动,液体通过阀体6上的回油口6a向外流出,但大于调节弹簧的弹簧力,从而顶杆8持续受到进口液压反馈力出口压力反馈力形成共同合力保持在压缩调节弹簧较大的位置(即衔铁5靠近垫片2使垫片靠近挡铁3大孔顶部),液体通过阀体6上的回油口6a持续向外流出,由于球阀座11顶部小孔的存在,持续经回油口排出的液体导致进口压力降低到略高于出口压力,从而实现保护系统的卸荷作用。当电磁阀通电时,工作原理与上相同,出口压力遵守平衡方程,系统压力同样通过回油口6a进行卸荷。
对所公开的实施例的上述说明,使本领域专业技术人员能够实现或使用本发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的,本文中所定义的一般原理可以在不脱离本发明的精神或范围内的情况下,在其他实施例中实现。因此,本发明将不会限制于本文所示的这些实施例,而是要符合于本文所公开的原理和新颖特点相一致的最宽的范围。
Claims (5)
1.一种挡铁与极靴一体的带卸荷功能的溢流型反比例减压电磁阀,由调节螺钉1,垫片2,挡铁3,薄膜4,衔铁5,阀体6,轴承7,顶杆8,阀座9,钢球10,球阀体11,安装阀体12,出口滤网13,球阀座14,进口滤网15,O形圈16,线圈17,调节弹簧18,轭铁19和接插件20组成,其特征在于:
所述调节螺钉1圆柱面设置有螺纹,下端设置有凸起小圆锥,由金属材料构成;
所述垫片2为圆环型薄片,由非导磁金属材料构成;
所述挡铁3为多段圆柱结构,上端设置有内螺纹,内螺纹下端连接大孔贯通挡铁,外圆柱面上设置从上到下设置相连的上锥面3a,圆柱面3b和下锥面3c,由软磁材料构成;
所述薄膜4为薄壁圆筒形,由耐磨、耐高温塑料构成;
所述衔铁5为圆柱形,内设通孔,由软磁材料构成;
所述阀体6为多段圆柱形,内设连通的小孔与大孔,径向设置有溢流回油口6a,由软磁材料构成;
所述轴承7为圆柱形,内设通孔,由耐磨材料构成;
所述顶杆8为多段圆柱形,上端设置有垂直于圆柱径向的半圆形槽8a,中间设置有工作面8b,由金属材料构成;
所述阀座9为圆柱形,内设连通的分液孔9a与溢流孔9b,由金属材料构成;
所述钢球10为球型,由金属材料构成;
所述球阀座11为多段圆柱形,圆柱中心设置有连通的3段台阶孔,径向设置有进液孔11a,进液孔11a与通过中心的3段台阶孔连通,沿轴线方向设置有2个偏心出液孔11b,出液孔贯通球阀座,出液孔与三段台阶孔不连通,由金属材料构成;
所述安装阀体12为带沟槽的多段圆柱结构,内设短圆柱孔,侧面设置有进口12a,端面设置有出口12b,由耐高温塑料构成;
所述出口滤网13为多孔薄片,由金属材料构成;
所述球阀座14为多段圆柱结构,有金属材料构成;
所述进口滤网15为薄壁圆筒形,由金属和塑料构成;
所述O形圈16为环型,横截面为圆形,由耐高低温橡胶构成;
所述线圈17为圆柱形,内设通孔,由塑料和漆包线构成;
所述调节弹簧18为圆柱压缩弹簧,由金属材料构成;
所述轭铁19为圆柱形,内设连通的小孔与大孔,由软磁材料构成;
所述接插件20根据安装要求而确定形状,由塑料和金属构成;
所述调节螺钉1安装于挡铁3螺纹孔内,调节螺钉1下部将调节弹簧18压紧;
所述垫片2放置于挡铁3大孔内;
所述挡铁3上端与轭铁19贴合,下端与阀体6内孔贴合;
所述薄膜4放置于挡铁3内孔,套接在衔铁5圆柱面上;
所述衔铁5上端内孔与调节弹簧18贴合,下端与顶杆8贴合;
所述阀体6上端大圆柱与轭铁19铆接,下端与安装阀体12可靠连接;
所述轴承7安装于阀体6内孔;
所述顶杆8套接在轴承7内孔中;
所述阀座9上端与顶杆8上的工作面8b贴合,下端与球阀座11紧密连接,外圆紧密安装在阀体6内孔中;
所述钢球10安装于球阀座11内孔中,且钢球可往复运动;
所述球阀体11与阀座9连接成一体,安装于阀体6内孔中;
所述安装阀体12可靠套接在阀体6上,且与球阀座11形成可靠密封;
所述滤网13安装于安装阀体12内;
所述球阀座14紧密安装于球阀体11内孔中;
所述进口滤网15套接在安装阀体12上设置的进口12a处;
所述O形圈16套接在安装阀体12的外圆上;
所述线圈17安装于轭铁19内且套接在挡铁3外圆上,上端与轭铁19贴合,下部与阀体6紧贴;
所述接插件20与线圈17可靠连接并且与轭铁19可靠固定。
2.根据权利要求1所述的一种挡铁与极靴一体的带卸荷功能的溢流型反比例减压电磁阀,其特征在于:挡铁3上的上锥面3a,圆柱段3b,下锥面3c以及大孔底部共同与衔铁5组成比例电磁铁中的磁分路器结构(即传统意义上的挡铁、极靴和衔铁结构)。
3.根据权利要求1至2所述的一种挡铁与极靴一体的带卸荷功能的溢流型反比例减压电磁阀,其特征在于:所述衔铁5可在薄膜4内往复滑动,提供电磁力和调节弹簧力的合力驱动顶杆8运动。
4.根据权利要求1至3所述的一种挡铁与极靴一体的带卸荷功能的溢流型反比例减压电磁阀,其特征在于:顶杆8与阀座9在阀座9上端面组成溢流阀工作。
5.根据权利要求1至4所述的一种挡铁与极靴一体的带卸荷功能的溢流型反比例减压电磁阀,其特征在于:当入口压力过高时,顶杆8与阀座9以及钢球10和球阀座11组成卸荷阀工作,对供油油路进行泄压,以降低入口压力维护系统安全。
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CN114838162A (zh) * | 2022-05-20 | 2022-08-02 | 广州汇通精密液压有限公司 | 一种减压阀 |
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