CN85108667A - 流体流量控制阀和控制方法 - Google Patents
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- Y10T137/7727—Excessive flow cut-off
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
用来限制有压流体流量的一种流量限制阀,包括带有一个圆断面连通腔的阀体。该腔中有个活塞,它在跨过活塞的压差所产生的力的作用下在腔内滑动到关闭位置。有一个细杆,它连着活塞并在活塞处于关闭位置时穿过活塞座伸进腔的外侧。细杆的对面是个封装在阀体里的磁铁,它可以响应于阀体外面的另一个磁铁而运动,以便接触细杆并把它推到开启位置。穿过阀体所施加的磁力经连在活塞上的细杆影响内部阀的操作。
Description
本发明一般来说涉及到用来控制有压流体的流量的阀,更确切地说涉及到当流量超过一个极限值时即行关闭的流量限制阀。
流量限制阀一般作为一种安全装置用于有压流体分配系统以便把流体源与任何破裂或破口隔离,从而减少有压流体的损失。适当设计的使用有毒、腐蚀或易爆有压气体或液体的系统利用流量限制阀来减少在事故情况下对这些危险化学品的暴露。给水系统往往利用流量限制阀来防止由于管子破裂使水大量流失。
从功能上说,一个流量限制阀允许流体流动达到预定的极限流量。通过一个装置的流量与上游供给压力和下游出口压力之间的差成比例。在正常工作时,跨过阀的压差确定一个小于或等于极限流量的通过阀的流量。下游分配系统中的破裂使下游压力下降,从而加大跨过阀的压差。此加大的压差对应着一个可能超过极限流量的通过阀的流量。为了把通过流量限制阀的流量限制于预定的极限,提供一个活塞或类似装置,当压差超过对应着极限流量的值时它封闭流动通路。通过阀的全部流量被封闭,直到通过修复破裂而降低压差并把活塞复位于其原始位置为止。
在先有技术中的一个典型的流量限制阀包括通过一个节流孔从进口到出口的第一流动通路。提供一个可动活塞以便在跨过节流孔的压差超过一定值时把第一流动通路关闭。来自节流孔的进口和出口侧的流体被引到活塞两对侧。得到弹簧帮助的出口压力倾向于把活塞推到允许流体流过阀的开启位置,而进口压力倾向于把活塞推到防止流体流动的关闭位置。弹簧及活塞这样设计,即大于对应着极限流量的压差的任何压差允许进口压力克服出口压力及弹簧力把活塞推到关闭位置。为了使此流量限制阀复位,打开一个旁通阀而流量流过第二流动通路,使活塞每侧的压力相等,从而允许弹簧把活塞推到开启位置。某些已知的阀利用带集成阀的第三流动通路来旁通截流阀以便提供流量极限的调整。这些形式的阀制造费用高,而且由于卷入多个流动通路及旁通阀而难于清理。此外,通过流量限制阀的流量在达到流量的极限值之前应该与压差成比例,而当超过极限值时应急剧减小到零。然而,弹簧偏置的流量限制阀在达到活塞开始压缩弹簧并从开启位置向关闭位置运动的点之前允许流量与压差成比例,但却不能提供急剧的关闭,因为进一步压缩弹簧并完成活塞从开启位置到关闭位置的运动需要附加的压差。
再者,用来控制有毒或腐蚀性流体和气体的已知阀通常靠挠性件或滑动密封件从外界控制阀的工作或复位。然而,这种方案通常是不能令人满意的,因为有当挠性件或滑动密封件在流体压力下损坏时环境可能被流过阀的有害流体的污染的危险。此外,诸如波纹管式或隔膜式装置之类的挠性件及滑动密封件通常沿流体通道造成不规则的“窝”或腔,当流体系统需要清洗时,或者引入不得被残留流体的污染的新流体时,这些“窝”或腔中的残留流体很难被清除。
因而,需要一种廉价的并能在极限流量下提供急剧的阀关闭的流量限制阀。还需要一种便于复位到开启位置并能调整到不同的极限流量的流量限制阀。此外,这种阀应有最少的“窝”以便于清理并排除有害流体通过滑动密封件漏进环境中的危险。
根据本发明的最佳实施例,流量限制阀包括带有在进口和出口处的螺纹或焊接压盖和一个圆断面连通腔的阀体。该腔中有个活塞,活塞上有一个通道,该通道决定阀的极限流量并且当流体流过它时建立一个跨过活塞的压差。流体通过阀的流动通路从进口到腔的进口侧,沿活塞的侧面进入腔的出口侧然后再到出口。如果跨过活塞的压差所产生的力超过提升活塞的质量或重量所需要的力,则活塞在腔中滑动到防止流体流过阀的关闭位置。活塞上的一个集成橡胶垫在活塞处于关闭位置时形成截断流动通路的密封件。提供一个细杆,它连在活塞上并在活塞处于关闭位置时穿过活塞座伸进腔的出口侧。在一个实施例中,一个封装磁铁安置成与细杆接触并把细杆及相连的活塞推到开启位置。
根据本发明的另一个最佳实施例,提供改进的方法和装置来控制有害流体,它包括一个通过改进结构的实心阀体共同动作的磁铁执行器,以保证防止泄漏的完善性并允许基本上彻底清除残留流体。
本发明的一个优点是从流动状态急剧过渡到封闭状态。
本发明的另一个优点是易于把阀从封闭状态复位到流动状态,而不依赖波纹管或隔膜或滑动密封件的完善性。
本发明的再一个优点是易于改变流量极限,方法是更换具有其相应的重量参数及流体流道截面的内部活塞。
图1是符合本发明的阀的剖视图;
图2是图1的阀的另一个实施例的剖视图。
参阅图1,图中表示本发明的流量限制阀,它把有压流体的流量限制到选定的极限。确切地说,图中表示一个最佳实施例的剖视图,该实施例有一个中空的大体上圆柱形的阀体(9)并有径向布置的进口流道(11)和出口流道(13)。阀体(9)的下端(15)被塞堵(7)封闭,此塞堵用螺纹或其他可拆方法连接于阀体(9)。一个橡胶密封件(19)被挤在塞堵(7)与阀体(9)之间,从而形成防止结构内的流体漏进环境的密封。塞堵(7)有足够大的直径,以便在拆下时为装配和修理阀的内部零件提供接近的通路。
内部零件包括阀座及活塞导向套(21),它安置在阀体(9)的内孔(23)里,靠在台肩(8)上。一个密封圈(27)安置在阀体(9)和套(21)之间,以便在阀座(29)被活塞(31)和橡胶垫(33)封闭时防止流体漏过阀座(29)。活塞(31)可带有纵向沟槽或在其圆柱面上制成的平坦部分(6),以便允许流体从进口流道(11)及连接流道(35)和(37)沿着并绕过活塞流动。
活塞(31)及阀座(29)的上部或“下游”是上腔(39),它经流道(71)与出口流道(13)相连。一个平板弹簧(43)装在上腔内套(21)顶部与磁铁(45)底部之间,磁铁可以封装在不锈钢壳或罩里或者封装在诸如聚丙烯或聚四氟乙烯(可从杜帮公司买到的“泰弗隆”材料)之类的不受流体影响的材料中。封装磁铁(45)安排成在上腔内滑动,以便其下端面(47)接触细杆(49),此细杆由活塞(31)带动经阀座(29)伸出,以便复位,如下面所述。
一个上罩(51)用适当方法连接于阀体(9)的顶部(例如用螺纹连接或用紧定螺丝(73)或类似方法)以便限定另一个磁铁(75)沿与阀体内的磁铁(45)对正的方向的运动。两个磁铁摆成磁性相斥的方向,而上磁铁可以外加彩色阳极处理的铝罩(53)以便把伸出的磁铁标志为按钮,用于复位;如下面所述。阀体(9)宜用诸如黄铜、不锈钢、铝、塑料之类的非磁性(或低磁性)材料制成,以保证磁铁之间的正确作用。
工作中,本发明的阀大体上垂直安放如图示,平板弹簧(43)支撑磁铁(45)和受斥磁铁(75)两者。活塞(31)通常落到套(21)的内底,因而使阀座(29)与橡胶垫(33)脱离或开启以便流体流过这里。注意,进入进口流道(11)的流体通常流过流道(35)、(37)和(6),通过阀座(29)、(33)到上腔,再经流道(39)、(71)到出口流道(13)。活塞(31)的重量及活塞(31)壁中的纵向沟槽或平面部分(6)的断面对于一定的流体密度来说确定着在活塞上移封闭阀座(29)和橡胶垫(33)处的流动之前穿过活塞(31)的流体流量的极限。因此图示实施例中的活塞(31)既作为节流装置又作为截流装置工作。跨过阀座(29)、(33)可能存在着显著的压差以保持活塞靠紧阀座的密封位置。因此,超过一个选定值的流体流量推动活塞(31)而截断流动。取下塞堵(7)后,可在套(21)中插入具有不同重量和不同尺寸的流道(6)的活塞,以便确定不同的流体流量上限,在此流量下活塞(31)运动以封闭流动。在大多数必须控制有害流体的应用场合,仅更换活塞(31)(即具有不同重量的沟槽的)立即可以确定流体流量的最大值,其范围是在选定的静压力下从零点几升每分到几百升每分。
如果出现过大的流体流量而活塞(31)向上运动封闭了进一步的流动,则只要在阀的进口侧保持静压力,阀就不会自行复位。因而,必须把阀复位到活塞(31)离开阀座(29)的位置。这是从外界实现的,不用滑动密封件或波纹管或类似的东西,办法是推动细杆(49),它宽松地穿过阀座(29)上的孔伸出,以便与磁铁(45)上的面(47)配合接触。于是,按下上磁铁(75)以减小两磁铁之间的空隙,从而加大向下作用于磁铁(45)的排斥力。当排斥力克服弹簧(43)作用于磁铁(45)的向上的力时,面(47)接触细杆(49)并向下推动它和活塞(31)使之离开阀座(29),从而重新恢复流体流动。阀座(29)的表面面积可以选成与工作流体压力成反比,以便保证阀工作在大约1~3000磅力每平方英寸的压力范围内。
根据图2所示的本发明的另一个实施例,基本阀组件的复位操作由一个执行器(77)遥控,该执行器包括装在一个气动(或电磁)结构里的上磁铁(75)。在此实施例中,上磁铁(75)被包容在活塞(79)里,此活塞可滑动地安装在壳体(81)里,壳体上端有个流体口(83)。于是,通过向口(83)施加有压流体,活塞(79)推动磁铁(75)接近磁铁(45),从而按上述方法使活塞(31)复位。在口(83)处的流体压力降低以后,弹簧(65)把上磁铁(75)推回到最高位置。当然,执行器(77)也可以是电磁式的,只要制成与磁铁(75)对正的圆柱形螺线管,以致于当向它通电流时,所产生的磁场将与磁铁(75)以已知的方式相互作用,使它移近磁铁(45),从而按上述方法进行复位操作。
每个实施例中的进口和出口流道(11)、(13)可以焊在阀体(9)上,而整个结构可以局限于大约1 1/4 英寸直径和2 1/2 英寸高度里,以便紧凑,工作可靠。由于尺寸减小,内部容积小,还由于内部流道的相当光滑的流通设计消除了如前所述对多重流道的需要,所以清理该结构以清除残留流体的工作在每个实施例中都被简化了。
因而,本发明的阀结构在一个密封的结构中容纳有害流体,不依赖于滑动密封件或挠性件来提供由外界施加的控制动作。此外,整个结构可以通过一个可密封的口这样装配和保养,以致于一经装配,则一个实施例中发生自动截流的最大设定流量不可能受于预。再者,简单的改进使基本阀结构能按不同方式工作,符合对通断动作或自动截流操作的复位功能的遥控要求。
Claims (6)
1、防止有压流体的过大流量通过它的一种装置,它包括:
在第一和第二腔之间有个供流体穿过它从第一腔流到第二腔的孔的一个体,上述孔在它的处于第一腔内的侧面上有个密封面;
处于远离孔的位置的与第一腔相连的一个流体进口,及与第二腔相连的一个流体出口;
安置在第一腔内流体进口与孔之间并装配成可移进或离开与孔的选择接触以便有选择地与该孔形成不透流体的密封接触的零件,上述零件提供从流体进口到孔的具有选定的断面面积的流体流道以便响应穿过上述选定的断面面积的流体流动对零件施加朝向孔的密封面的自作用移动力;
搭载在上述零件上的一个执行器,安置成能穿过孔运动,以便从第二腔对第一腔里的该零件有选择地施加运动;
包括一个磁铁的控制装置,该磁铁装配成能在第二腔内运动,以便可选择地接触执行器;以及
磁铁装置,它安置在体外,与控制装置直接对正靠磁性相互作用,以便有选择地驱动执行器去把该零件推离与上述孔的密封面的密封接触。
2、如权利要求1所述的装置,其中:
上述第二内腔经上述孔大体上与上述第一内腔对正;以及
上述流体流道的断面面积选择成响应于流过该流体流道的有压流体瞬时超过有压流体的选定的流量,驱动上述零件进入与孔的自作用密封接触。
3、如权利要求2所述的装置,包括安置在第二腔中的弹簧装置,以便驱动上述控制装置离开与执行器的接触,从而允许上述流体进口处的有压流体把上述零件保持在与上述孔密封接触的状态。
4、如权利要求3所述的装置,其中上述磁铁装置包括一个磁铁而且可以响应于所施加的力而动作,从而移动到更靠近控制装置的磁铁并与它磁性排斥,以便有选择地改变它在第二腔中的位置,从而向执行器施加力,以便有选择地把上述零件推离与孔的密封接触。
5、防止有压流体的过大流量经过在一个刚性体里在进口腔与出口腔之间的一个孔的方法,该方法包括下列步骤;
在进口腔里插入一个零件,它可相对于孔运动,以便有选择地与孔形成密封,它还带有一个穿过孔伸进出口腔的执行器;
提供一个供有压流体通过进口腔绕过芯子到孔的流道,以便响应于超过选定的流量的有压流体通过该流道的瞬时流量,驱动芯子进入与该孔不透流体的密封接触:
在出口腔里插入一个带有磁性的辅助零件,以便有选择地运动到与穿过孔的执行器接触;以及
从出口腔的外部有选择地施加磁力,以便有选择地推动辅助零件,从而驱动执行器和相应的零件脱离与孔的密封接触。
6、如权利要求5所述的方法,其中有选择地施加的步骤中,按轴向对正的磁性排斥关系对辅助零件的运动施加磁力,以便推动执行器和零件脱离由进口腔中的有压流体所保持的与孔的密封接触。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/675,825 US4624443A (en) | 1982-07-16 | 1984-11-28 | Fluid-flow control valve |
US675,825 | 1984-11-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
CN85108667A true CN85108667A (zh) | 1986-08-20 |
CN1004166B CN1004166B (zh) | 1989-05-10 |
Family
ID=24712115
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN85108667.5A Expired CN1004166B (zh) | 1984-11-28 | 1985-11-27 | 流体流量控制阀 |
Country Status (6)
Country | Link |
---|---|
US (1) | US4624443A (zh) |
EP (1) | EP0183205B1 (zh) |
JP (1) | JPS61130677A (zh) |
KR (1) | KR860004266A (zh) |
CN (1) | CN1004166B (zh) |
DE (1) | DE3585026D1 (zh) |
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CN109253287A (zh) * | 2018-10-30 | 2019-01-22 | 深圳市协鸿环保设备有限公司 | 一种安全阀及其工作方法 |
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-
1985
- 1985-11-20 JP JP60260986A patent/JPS61130677A/ja active Pending
- 1985-11-22 EP EP85114859A patent/EP0183205B1/en not_active Expired - Lifetime
- 1985-11-22 DE DE8585114859T patent/DE3585026D1/de not_active Expired - Lifetime
- 1985-11-27 CN CN85108667.5A patent/CN1004166B/zh not_active Expired
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CN101287939B (zh) * | 2005-06-14 | 2010-06-02 | 约西·达纳 | 流体流量控制器 |
US8365753B2 (en) | 2005-06-14 | 2013-02-05 | Yossi Dana | Fluid flow controller |
CN109253287A (zh) * | 2018-10-30 | 2019-01-22 | 深圳市协鸿环保设备有限公司 | 一种安全阀及其工作方法 |
CN113294571A (zh) * | 2021-05-28 | 2021-08-24 | 青岛迪丰机械有限公司 | 一种高精度医疗气体减压阀 |
CN113294571B (zh) * | 2021-05-28 | 2022-06-03 | 青岛迪丰机械有限公司 | 一种高精度医疗气体减压阀 |
Also Published As
Publication number | Publication date |
---|---|
EP0183205B1 (en) | 1991-12-27 |
EP0183205A2 (en) | 1986-06-04 |
KR860004266A (ko) | 1986-06-20 |
EP0183205A3 (en) | 1987-07-29 |
US4624443A (en) | 1986-11-25 |
DE3585026D1 (de) | 1992-02-06 |
CN1004166B (zh) | 1989-05-10 |
JPS61130677A (ja) | 1986-06-18 |
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