CN114877101A - 一种快速缓冲液压换向阀 - Google Patents
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- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
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- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
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- F16K31/00—Actuating devices; Operating means; Releasing devices
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- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0675—Electromagnet aspects, e.g. electric supply therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0686—Braking, pressure equilibration, shock absorbing
- F16K31/0696—Shock absorbing, e.g. using a dash-pot
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
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Abstract
一种快速缓冲液压换向阀涉及换向阀领域,包括阀体、阀芯、电磁线圈、铁芯、缓冲垫,图中P口为供油口,A、B口分别为左右两路出油口,T1、T2分别为左右两路的回油口,阀体内设有阀腔,阀芯安装在阀腔内,阀腔两端安有铁芯,阀体两端设有排气孔,铁芯靠近阀腔侧安有缓冲垫,铁芯外侧安有电磁线圈。阀芯与阀腔结构配合,阀芯在阀腔内运动。铁芯是电磁铁轴心的部件,阀芯是阀体内的部件。电磁铁通电之后,铁芯4动作,通过磁力推动阀芯动作,完成液压换向阀的功能。换向阀采用锥面密封,打破了传统换向阀的密封形式,锥面密封的特点是只要阀芯开始运动,两个密封面之间就会产生间隙,并逐渐增大,所以换向压力是逐步减小,换向完成后,系统压力逐步增加,整个换向过程中压力变化呈澡盆曲线,所以换向平稳。
Description
技术领域
本发明涉及换向阀领域,尤其是一种快速缓冲液压换向阀。
背景技术
目前广泛使用的液压换向阀均为圆柱形阀芯,靠圆柱形阀芯的运动打开或关闭连接不同油口的各个油腔,完成液压油油路换向的目的。
这种换向阀存在的问题:一是各个油腔之间需要一定的密封长度,阀芯需要运动一定的距离才能打开连接油口的油腔,在没有打开油腔前,各个油路是处于关闭状态,此时供油口持续供油,会造成系统压力瞬时升高,待需要连通的油腔打开后,压力突然释放,系统会产生很大的压力冲击,从而产生管路振动。虽然可以通过增加油口开度比例控制来降低换向冲击,但由此带来换向阀发热问题,同时也大大提高了生产成本。
发明内容
本发明的目的是提供一种快速缓冲液压换向阀,用来解决换向阀换向冲击带来的管路振动及换向阀发热问题,同时提高换向反应速度,减少换向能耗,降低换向阀生产成本。
本发明的技术方案:一种快速缓冲液压换向阀,包括阀体1、阀芯2、电磁线圈3、铁芯4、缓冲垫5,图中P口为供油口,A、B口分别为左右两路出油口,T1、T2分别为左右两路的回油口,阀体1内设有阀腔6,阀芯2安装在阀腔6内,阀腔6两端安有铁芯4,铁芯靠近阀腔侧安有缓冲垫,铁芯外侧安有电磁线圈3。阀芯与阀腔结构配合,阀芯在阀腔内运动。铁芯4是电磁铁轴心的部件,阀芯2是阀体1内的部件。电磁铁通电之后,铁芯4动作,通过磁力推动阀芯2动作,完成液压换向阀的功能。
所述阀芯2与阀体1为锥面密封,阀芯2的锥面为内密封面7,所述阀体1的锥面为外密封面8,所述内密封锥面与外密封锥面平行,内外密封锥面间隙为δ。
所述内密封锥面与外密封锥面的锥面角度为45度。锥面选择45度不仅加工方便,工作时避免自锁(自锁角度为21度-23度),并且工作时存积杂质少,当内外两个锥面的间隙δ为0时,内外两个锥面紧密贴合,实现锥面密封。
本发明的有益技术效果:
换向阀采用锥面密封,打破了传统换向阀的密封形式,锥面密封的特点是只要阀芯开始运动,两个密封面之间就会产生间隙,并逐渐增大,所以换向压力是逐步减小,换向完成后,系统压力逐步增加,整个换向过程中压力变化呈澡盆曲线,所以换向平稳。
液压油由P口进入换向阀,通过电磁铁的通断,带动阀芯运动,分别关闭或打开A、B、T1、T2油口,实现油路换向的目的。采用锥面密封,当内外两个锥面的间隙δ为0时,内外两个锥面紧密贴合,实现锥面密封,见图5。换向时,阀芯开始运动,两个锥面的距离δ大于0,油路就会打开,随着密封面间隙δ的增加,过油面积逐步加大,系统流量平稳增加,系统压力逐渐降低,从而消除了换向冲击。同时消除了换向延迟带来的系统压力升高。另外,换向过程中,所有油口均处于连通状态,各油口间压力逐渐趋于平衡,系统压力维持在最低,油泵做功最小。当换向完成后,系统压力由最低逐渐增加到工作压力,因此,从根本上消除了换向冲击。另外,整个换向过程中无节流现象,因此,也不会产生温升。
附图说明
图1是本发明的结构示意图。
图2是本发明的阀芯运动到最左端工作状态图。
图3是本发明的系统压力处于最低状态示意图。
图4是本发明的阀芯运动到最右端工作状态图。
图5是本发明的有效技术效果示意图。
具体实施方式
下面结合附图和具体实施例对发明做进一步的详细说明。
结合附图1、5,一种快速缓冲液压换向阀,包括阀体1、阀芯2、电磁线圈3、铁芯4、缓冲垫5,图中P口为供油口,A、B口分别为左右两路出油口,T1、T2分别为左右两路的回油口,阀体1内设有阀腔6,阀芯2安装在阀腔6内,阀腔6两端安有铁芯4,铁芯靠近阀腔侧安有缓冲垫,铁芯外侧安有电磁线圈3。阀芯与阀腔结构配合,阀芯在阀腔内运动。铁芯4是电磁铁轴心的部件,阀芯2是阀体1内的部件。电磁铁通电之后,铁芯4动作,通过磁力推动阀芯2动作,完成液压换向阀的功能。
阀芯2与阀体1之间为锥面密封,阀芯2的锥面为内密封面,所述阀体1的锥面为外密封面,所述内密封面与外密封面的锥度相同,内外密封锥面贴合时间隙为δ为零。
内密封锥面与外密封锥面的锥面角度为45度。锥面选择45度不仅加工方便,并且工作时存积杂质少,当内外两个锥面的间隙δ为0时,内外两个锥面紧密贴合,实现锥面密封,见图5。换向时,阀芯开始运动,两个锥面的距离δ大于0,油路就会打开,随着密封面间隙δ的增加,过油面积逐步加大,系统流量平稳增加,系统压力逐渐降低,从而消除了换向冲击。
结合附图2、3、4详细说明一种快速缓冲液压换向阀的应用:
1.当左侧电磁铁得电时,阀芯运动到最左端。此时, P-B油路开启,油泵提供的压力液压油由P口进入B口连接的管路,为该油路的液压执行器提供动力。同时,A-T1油路连通,连接A口油路的液压油通过该通路流回油箱。见图2.
2.右侧电磁铁得电,左侧电磁铁失电,阀芯处于向右侧运动中,所有油路均处于连通状态。此时系统压力处于最低状态。见图3.
3.阀芯运动到最右端,此时, P-A油路开启,油泵提供的压力液压油由P口进入A口连接的管路,为该油路的液压执行器提供动力。同时,B-T2油路连通,连接B口油路的液压油通过该通路流回油箱,系统完成换向。见图4.
Claims (4)
1.一种快速缓冲液压换向阀,包括阀体(1)、阀芯(2)、电磁线圈(3)、铁芯(4)、缓冲垫(5),排气孔(7)、供油口(P),左右两路出油口A、B,T1、T2分别为左右两路的回油口,其特征在于:阀体(1)内设有阀腔(6),阀体(1)两端设有排气孔(7)阀芯(2)安装在阀体(1)的阀腔(6)内,阀腔(6)两端安有铁芯(4),铁芯(4)靠近阀腔侧安有缓冲垫(5),铁芯(4)外侧安有电磁线圈(3),阀芯与阀腔结构配合,阀芯(2)在阀腔内运动。
2.根据权利要求1所述的一种快速缓冲液压换向阀,其特征在于:所述阀芯(2)与阀体(1)之间为锥面密封,阀芯(2)的锥面为内密封面,所述阀体(1)的锥面为外密封面,所述内密封面与外密封面的锥度相同,内外密封锥面贴合时间隙为δ为零。
3.根据权利要求1所述的一种快速缓冲液压换向阀,其特征在于:所述内密封锥面与外密封锥面的锥面角度为45度。
4.根据权利要求1所述的一种快速缓冲液压换向阀,其特征在于:其工作步骤
步骤1、左侧电磁铁得电时,阀芯运动到最左端,此时, P-B油路开启,油泵提供的压力液压油由P口进入B口连接的管路,为该油路的液压执行器提供动力,同时,A-T1油路连通,连接A口油路的液压油通过该通路流回油箱;
步骤2、右侧电磁铁得电,左侧电磁铁失电,阀芯处于向右侧运动中,所有油路均处于连通状态,此时系统压力处于最低状态;
步骤3、见阀芯运动到最右端,此时, P-A油路开启,油泵提供的压力液压油由P口进入A口连接的管路,为该油路的液压执行器提供动力,同时,B-T2油路连通,连接B口油路的液压油通过该通路流回油箱,系统完成换向。
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