CN1503884A - 探测断裂的阀杆的方法 - Google Patents
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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
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0025—Electrical or magnetic means
- F16K37/0041—Electrical or magnetic means for measuring valve parameters
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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
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
- F16K37/0083—For recording or indicating the functioning of a valve in combination with test equipment by measuring valve parameters
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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
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
- F16K37/0091—For recording or indicating the functioning of a valve in combination with test equipment by measuring fluid parameters
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/0318—Processes
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7758—Pilot or servo controlled
- Y10T137/7759—Responsive to change in rate of fluid flow
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7758—Pilot or servo controlled
- Y10T137/7761—Electrically actuated valve
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8158—With indicator, register, recorder, alarm or inspection means
- Y10T137/8175—Plural
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8158—With indicator, register, recorder, alarm or inspection means
- Y10T137/8225—Position or extent of motion indicator
- Y10T137/8242—Electrical
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Indication Of The Valve Opening Or Closing Status (AREA)
- Preventing Unauthorised Actuation Of Valves (AREA)
Abstract
一种在具有以微处理器为基础的阀位控制器的过程控制系统中,对流体控制阀阀杆、阀塞或阀座的可能失灵提供指示和警报的方法。监测驱动压力、驱动信号、阀位反馈信号。如果探测到驱动压力或阀位反馈的变化大过预定变化,则启动第二系列的探测步骤。在第二系列的探测步骤中,对于同一设定点,将目前设定点如流量或其他过程变量对于过程数值的关系,与存储测试周期所衍生的设定点对于过程数值的关系相比较。如果过程数值变化,操作者会收到警报;因为这种变化可能指示阀杆、阀塞、阀座已经损坏,需要检查。
Description
本发明涉及用于将控制过程变量的流体阀定位的阀位控制器(valvepositioner)。本发明尤其涉及一种用于探测控制阀的失灵元件,如损坏或断裂的阀杆,或损坏的阀塞或阀座的方法。
发明的背景
阀位控制器通常用于在输油管、输气管、化学处理厂等中控制流体阀和相关流体。通常,阀位控制器包括微处理器,用于精确控制过程(process)中的流体,并对阀门进行诊断操作。
过程控制业现使用各类型的阀位控制器。有些阀位控制器以机械方式接到致动器,有些则将致动器插入阀位控制器内部。致动器提供将阀门实际定位的装置(means),可用电力、液压或气压操作。电力致动器有电流信号,电流信号驱动传动器(motor),传动器将阀门定位。液压致动器具备用于将阀门定位的充油装置。在过程控制业中,一种最常见的类型的阀门致动器-气压致动器装有一个或一组活塞,以及一隔膜(diaphragm)。阀位控制器取决于应用和控制集成程度,从控制器接收多种代表阀门期望位置的输入。一种类型是电流量为4-20毫安或10-50毫安的电流输入,第2类型是叠加于电流信号的数字信号,第3类型是全数字输入,如Fieldbus或HART。另外,阀位控制器还可接收每平方英寸(PSI)3至15磅,代表阀门期望位置的气压输入。阀门控制器还取决于集成程度和应用,有不同类型的输出。有些阀门控制器向传动器提供输出电流,而其他阀门控制器则有快速响应液压输出。阀门控制器最常见的一种类型输出是每平方英寸0至200磅气压输出。按照本应用中的“阀门控制器”一词包括所有现场安装的仪器,其中包括各种输入和输出,以及其相应用于阀门定位的装置(如果适用)。
在弹簧和活塞/隔膜致动器最常见的情况中,隔膜会因阀门定位器所传送的压力而偏移(deflect),以此分别向控制阀杆或旋转元件施加作用力或力矩,从而改变阀门位置。差不多所有阀门控制器都装有机械或电子阀位传感器,以提供阀位信号,阀位信号会反馈到阀位控制器中的以微处理器为基础的控制部分。无论什么用于传送压力将阀门定位的具体装置,装有以微处理器为基础的控制规则系统(algorithim)的阀位控制器是公知的。
美国第5,549,137、5,558,115、5,573,032号专利(全都如本申请,转让给同一受让方),各提供一种以微处理器为基础的阀位控制器,而这些阀位控制器有实时诊断器,以提供阀门和致动器是否完整的信息。所有这些以微处理器为基础的阀位控制器,全不能易于探测断裂的阀杆、断裂或损坏的阀塞,或断裂或损坏的阀座。例如以阀位控制器仪器的链接装置完整的方式如果阀杆断裂,该仪器监测反馈信号并将致动器定位到认为是正确阀位的位置,阀塞实际上并无移动。在现代以微处理器为基础的阀位控制器仪器中,阀位控制器会对阀杆断裂过程中迅速响应(通常少于100毫秒)。仪器快速响应将掩蔽(mask)任何可能的主机对阀门性能的监测,使阀杆断裂的发生继续未被发现,直到一些过程因阀门性能失灵而变化为止。在此情况下,阀塞可能以一种没对过程造成很大干扰的方式失灵,使断裂或已损坏的阀杆、阀塞、阀座可能继续长期未被发现,最终导致过程失控。
实际探测这种断裂的阀门元件,如断裂或损坏的阀杆、阀塞或阀座,就需要一振动传感器或某些其他复杂的机械传感器,但费用昂贵,还需对阀位控制器和阀门组件添加硬件。因此,希望提供一种技术可用于对阀门元件可能的断裂提供充分的指示,以便建议需由技术员检查。特别是,希望提供这种阀杆、阀塞、阀座失灵的探测技术,其无需添加机械元件,并且不取决于特定阀门配置,并且因此易于实现提早警报指示阀门元件可能的断裂。
发明概述
根据是本发明的原理,本发明提供一种用于指示在一种配置中,阀杆、阀塞或阀座可能失灵的方法。在该类型配置中,以微处理器为基础的阀位控制器在过程控制系统中控制阀门致动器和流体控制阀门。
特别是,监测对于以微处理器为基础的压力(I/P)式阀位控制器的电流驱动信号,还监测连接到阀门致动器的阀位控制器的驱动压力输出,用于在输入到阀位控制器的设定点(set point)的驱动信号不变的情况下,探测离开稳定的驱动压力的预定变化。还监测阀杆位置反馈信号,在设定点的驱动信号不变的情况下,用于探测离开稳定的阀杆位置反馈信号的预定变化。如果探测到稳定的驱动压力和阀杆位置反馈信号中的至少一个预定变化,则提供阀杆、阀塞或阀座发生了故障的指示。
当阀杆、阀塞或阀座故障指示出现时,启动监测过程数值,用以探测过程数值的偏差,如监测过程流量对于一设定点数值的关系,并在设定点不变的情况下,探测这种关系的变化。在设定点不变的情况下,过程数值的偏差,指示阀杆可能断裂,或阀塞或阀座可能损坏。
当实施本发明所提供的方法时,并行进行两种警报探测。第一种警报用于表示阀门有故障。在设定点无相应变化的情况下,这种警报表示驱动压力和/或阀位反馈信号重大变化,如变化超过10%。于是探测到这种重大预定变化后,能启动第二种警报探测。
第二种警报在设定点不变的情况下,会查找设定点对于过程数值关系的变化。如果探测到差别,则该过程可发出指示,指示阀杆、阀塞或阀座可能出现问题。然后,操作者会查找过程发生了什么问题。如果测到问题,可引导有关人员检查阀门。
本发明最显著的优点,是可在早期阶段探测阀门有何问题,从而避免高价的过程流体的可能流失。此外,本发明还可用于识别和选择可能需要检查的流体控制阀门。
附图说明
特别是在所提出的权利要求中描述了据信是创新的本发明的特征。参照结合附图所进行的如下描述,可充分理解本发明,在各附图中相同构件由相同编号识别,各附图中:
图1是一示意图,说明在一种过程控制系统中,一种以微处理器为基础的阀位控制器正操作一种致动器和一种流体控制阀门。
图2是一流程图,说明实施本发明的方法的步骤。
详细描述
现介绍图1。图1说明一种以微处理器为基础的阀位控制器10,其中包括提供有电流的压力控制器(positioner)12和微处理器14。阀位控制器10连接到压力源16,经输入线路18接收驱动信号,用于经输出线路20向阀门致动器22提供相应驱动压力。致动器22的输出端连接到流体控制阀门26的阀杆24。阀门26连接到流体处理系统的管线28。阀杆24连接到阀塞30(而阀塞30与阀座32密封连接),以控制从进口阀34通过处于阀门开启位置的阀座流动到出口阀36的流体。
在流体处理控制系统的典型操作中,设定点电路38经输入线路18向微处理器14提供驱动信号,以此经由致动器22移动阀杆,进而在阀门26输出26中提供期望过程数值。由过程数值测量器(40)确定该过程数值(例如可是期望流量),例如用于连接到公知的过程比例/积分/微分(PID)单元42,以便将设定点38重新设定。由连接到阀杆的反馈链接装置44提供阀杆24与阀位控制器10之间公知的反馈配置,以便向阀位传感器46提供关于阀杆位置的信息。由阀位传感器46发出的阀位反馈信号,经反馈线路48耦合到微处理器14。
在这种典型流体处理控制系统中,一标准阀位控制器无法易于深测断裂的阀杆24。如果阀杆24在反馈连接装置44与阀塞30之间的位置断裂,但连接到致动器22的反馈连接装置44依然完好无损,一标准阀位控制器监测反馈信号,并将致动器置于其认为正确的位置,但由于阀杆24已经断裂,阀塞30实际上并无移动。此外,在现代现场仪器中,阀位控制器会对该过程迅速响应(通常少于10毫秒)。现场仪器迅速响应掩蔽了监测阀门性能的标准监测,使阀杆断裂继续未被探测到,直到一些过程数值因阀门性能失灵而发生变化,而过程数值测量器40会检测这一变化。正如早前指出,在某些情况下,阀杆和阀塞以可没对过程造成很大干扰的方式失灵,使断裂的阀杆/阀塞可能有一段时间未被探测到。这会导致过程失控。
现介绍图2。图2表示一种提供指示阀杆、阀塞或阀座可能出现问题的方法。该方法可与其他指示器并用,以建议技术员应进行检查。在本发明的阀位控制器10中,微处理器14包括一个断裂阀杆/阀塞/阀座探测规则系统50,其执行图2所示的步骤。
如图2所示,在步骤52,监测从设定点驱动信号产生的经线路20的驱动压力,以判定是否维持稳定的驱动压力52。此外,在步骤54,监测经反馈线路48传送的阀位反馈信号,以判定是否维持稳定的阀位反馈54。如果有稳定的驱动压力52和稳定的阀位反馈54,则判定阀杆没有动作56(activity),并退出探测例行程序58。然而,如果例如阀杆断裂,作用在致动器22的力变化,因为阀塞将来自过程的某些力(或来自阀体的摩擦力)作用到致动器。
图2说明两种并行警报探测。第一种警报表示阀门故障的警报。这种警报表示在设定点38无相应变化的情况下,驱动压力20有重大变化,如变化超过10%(由稳定驱动压力监测步骤52判定),和/或阀位反馈信号48的变化超过10%(由阀位反馈稳定监测步骤54判定)。因此,如果在步骤52没有稳定的驱动压力,则经线路60发出警报,步骤62表示产生阀杆故障。同样,如果阀位反馈信号变化超过10%,则稳定阀位反馈步骤54监测这种变化,并经线路64发出指示,以示产生阀杆故障62。
阀杆故障62的产生,会启动过程偏差探测步骤66,对在在某个时间区间即相对于过程响应时间(即所谓“空载时间(dead time)”特定设定点,查找过程数值测量器40任何过程偏差。时间区间例如在以往某个测量周期中判定,而测试周期过程数值对于设定点的关系存储在微处理器14中。
在过程比较步骤68中,在设定点不变的情况下,检查设定点对于过程数值的关系(即,设定点38对于过程数值测量器40的关系)。即过程变化比较步骤68与以往某个测试周期的设定点对于过程数值的关系相比较,查找对于同一控制器和同一个设定点,当前设定点对于过程数值的关系之间的变化。如果探测到过程数值对于设定点的关系的差别,就会指出有故障发生,继而发出信号启动阀杆和过程警报步骤70,向操作者发出警报,指示阀杆、阀塞或阀座可能出现问题。然后,操作者可查找过程发生了什么问题。或探测到问题,可引导有关人员检查阀门26。
为清楚理解已经提供以上详细描述,不应由此理解为必要的限制,显然,本领域技术人员可以进行改进。
Claims (5)
1.在一种以微处理器为基础的阀位控制器中,具有设定点输入并提供用于控制阀门致动器的驱动信号,用于响应对于阀位控制器的阀杆位置反馈信号,利用相应驱动压力,相对流体控制阀门的阀座操作阀杆和阀塞并将其定位:
一种提供指示阀杆、阀塞或阀座可能失灵的方法;所述方法包括:
监测驱动信号;
监测对于阀门致动器的驱动压力,用于在设定点不变的情况下,探测离开稳定的驱动压力的预定变化;
监测对于阀位控制器的阀杆位置反馈,用于在设定点不变的情况下,探测离开稳定的阀杆位置反馈信号的预定变化;
如果探测到稳定驱动压力和阀杆位置反馈信号中至少一个的预定变化,提供阀杆、阀塞或阀座故障的指示。
2.根据权利要求1所述探测阀杆、阀塞或阀座可能失灵的方法,其中包括:
响应于阀杆、阀塞或阀座的故障指示,启动监测过程数值,用以探测过程数值的任何偏差。
3.根据权利要求2所述的方法,在该方法中,所述监测过程数值包括监测过程流量。
4.根据权利要求3所述的方法,在该方法中,所述监测过程流量包括监测一过程流量对于设定点数值的关系,并探测在设定点不变的情况下所述关系任何变化。
5.根据权利要求2所述的方法,包括响应于探测到过程数值的偏差提供警报,以此指示阀杆可能断裂,或阀塞或阀座可能损坏。
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US09/836,307 US6382226B1 (en) | 2001-04-17 | 2001-04-17 | Method for detecting broken valve stem |
US09/836,307 | 2001-04-17 |
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BR (1) | BRPI0208604B1 (zh) |
CA (1) | CA2447001C (zh) |
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US6382226B1 (en) | 2002-05-07 |
CA2447001C (en) | 2008-01-22 |
BRPI0208604B1 (pt) | 2016-10-25 |
DE60211325D1 (de) | 2006-06-14 |
WO2002084157A1 (en) | 2002-10-24 |
EP1379803B1 (en) | 2006-05-10 |
BR0208604A (pt) | 2004-03-02 |
CN1288376C (zh) | 2006-12-06 |
JP4088160B2 (ja) | 2008-05-21 |
JP2005502824A (ja) | 2005-01-27 |
DE60211325T2 (de) | 2007-04-26 |
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