WO2022154170A1 - Procédé de calcul de force de frottement de garniture de vanne - Google Patents

Procédé de calcul de force de frottement de garniture de vanne Download PDF

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Publication number
WO2022154170A1
WO2022154170A1 PCT/KR2021/003745 KR2021003745W WO2022154170A1 WO 2022154170 A1 WO2022154170 A1 WO 2022154170A1 KR 2021003745 W KR2021003745 W KR 2021003745W WO 2022154170 A1 WO2022154170 A1 WO 2022154170A1
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WO
WIPO (PCT)
Prior art keywords
packing
valve
stem
friction force
friction
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PCT/KR2021/003745
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English (en)
Korean (ko)
Inventor
류호근
김재형
임태묵
Original Assignee
(주)수산인더스트리
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Application filed by (주)수산인더스트리 filed Critical (주)수산인더스트리
Publication of WO2022154170A1 publication Critical patent/WO2022154170A1/fr

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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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N19/00—Investigating materials by mechanical methods
    • G01N19/02—Measuring coefficient of friction between materials
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C17/00—Monitoring; Testing ; Maintaining

Definitions

  • the present invention relates to a method for calculating the friction force of a valve packing, and more particularly, the change in the friction force of the packing due to the pressure of the flow by a static diagnostic test without performing a dynamic diagnostic test in a state in which the valve stem and the valve actuator are actually assembled. It relates to a method for calculating the valve packing friction force that can be easily and accurately calculated.
  • valves are installed in various plants such as nuclear power plants and thermal power plants to control the flow and flow rate of fluids such as water and air, and these valves play an important role in the operation and safety of the system.
  • valves installed in nuclear power plants, thermal power plants, etc. may cause a failure of the power plant to stop operation or cause a safety accident.
  • a valve is a valve body having a valve seat provided in a conduit connecting an inlet and an outlet, a valve stem that selectively opens and closes a conduit by contacting and releasing contact with the valve seat when reciprocating inside the valve body, and connected to the valve stem It is composed of an assembly (hereinafter referred to as a valve assembly) including a valve actuator for reciprocally driving the valve stem in a direction toward the valve seat.
  • a valve assembly an assembly including a valve actuator for reciprocally driving the valve stem in a direction toward the valve seat.
  • valve assembly is installed inside the valve body in a form that surrounds the outer circumferential surface of the valve stem reciprocating inside the valve body to prevent leakage of fluid flowing through the inside of the valve body, so that the airtight between the valve stem and the valve body a valve packing for holding the , can be pressed in the direction toward the valve stem by the gland bolt (Gland bolt) and the gland nut (Gland nut).
  • the apparatus and method for calculating the coefficient of friction of packing disclosed in the above publication only have a problem that it cannot accurately measure the change in the friction force of the packing due to the pressure according to the flow of the fluid with the data measured in the actual driving process of the valve assembly. Rather, in the process of calculating the packing friction coefficient, the friction force is obtained in a different valve assembly state from the actual device in a specially designed device.
  • the present invention was invented to improve the above problems, and the problem to be solved by the present invention is a change in packing friction force and packing friction force measured while performing a static diagnostic test in a state in which the valve stem and the valve actuator are actually assembled. After calculating the packing-stem friction coefficient and packing stress from Calculation of the valve packing friction force that can more easily calculate the packing friction force by the pressure of the flow by the diagnostic test, and more accurately calculate the change in friction force according to the packing stress change in addition to the packing-stem friction coefficient of the valve packing to provide a way
  • the valve packing friction calculation method includes a valve body in which a pipe connecting an inlet and an outlet is formed, and selectively opening and closing the pipe when reciprocating inside the valve body a valve stem for reciprocating the valve stem, a valve actuator for reciprocating the valve stem, a valve packing for maintaining airtightness between the valve stem and the valve body, and a gland for pressing the valve packing in the axial direction of the valve stem (
  • the method of calculating the valve packing friction force of a valve assembly including a gland) the first packing friction force in a closing stroke in which the valve stem closes the conduit through a static diagnostic test in a state in which the valve stem and the valve actuator are actually assembled measuring; measuring a second packing friction force in an opening stroke in which the valve stem opens the conduit while performing the static diagnostic test; Packing-stem coefficient of friction and packing stress of the valve packing from the first packing friction force, the first packing friction change to the first packing friction force, the second packing friction force and the second packing friction force change to the
  • the measuring of the first packing friction force and the second packing friction force is characterized in that the first packing friction force and the second packing friction force are measured by a strain gauge installed on the valve stem.
  • the step of calculating the packing-stem friction coefficient and the packing stress may include: the first packing friction force, the first packing friction force change, the second packing friction force, the second packing friction force change, the diameter of the valve stem;
  • the packing-stem friction coefficient and the packing stress are calculated using the diameter of the gland provided on the upper side of the valve packing and the height of the valve packing.
  • the step of calculating the packing-stem friction coefficient and the packing stress may include the packing-stem using the first packing friction force change, the second packing friction force change, the diameter of the valve stem and the diameter of the gland. calculating a coefficient of friction and a coefficient of packing-bonnet friction; and calculating the packing stress using the first packing friction force, the second packing friction force, the packing-stem friction coefficient, and the packing-bonnet friction coefficient.
  • the packing-stem friction coefficient and the packing-bonnet friction coefficient are calculated using the following [Equation 1] to [Equation 4] It is characterized in that it is calculated.
  • valve stem diameter, gland diameter and valve packing height are the ratio of the gland stress in the axial direction to the gland stress in the radial direction, is the change in packing stress, and is the ratio of the gland stress in the axial direction to the gland stress in the radial direction in the closing stroke and opening stroke, respectively.
  • valve stem diameter , gland diameter , packing-stem friction coefficient and packing-bonnet friction coefficient It is a coefficient defined by .
  • the calculating of the packing stress is characterized in that the packing stress is calculated using the following [Equation 5] and [Equation 6].
  • the step of calculating the actual packing friction force is, using the following [Equation 7] and [Equation 8] to calculate the actual packing friction force considering the flow from the packing-stem friction coefficient and the packing stress do it with
  • valve stem diameter , gland diameter , packing-stem friction coefficient and packing-bonnet friction coefficient is the coefficient defined by is a constant due to the pressure of the flow, which is a constant that considers the decrease in the contact pressure of the valve packing due to the flow pressure.
  • the actual packing friction force can be more easily calculated.
  • the method for calculating the valve packing friction force according to an embodiment of the present invention, by calculating the packing stress as well as the packing-stem friction coefficient from the changes in the packing friction force and the packing friction force measured during the static diagnostic test, the actual In the state where the valve stem and the valve actuator are assembled, the change in the actual packing friction force due to the pressure of the flow can be more accurately calculated by the static diagnostic test without performing the dynamic diagnostic test.
  • FIG. 1 is a diagram schematically showing the structure of a valve packing friction force calculation device according to an embodiment of the present invention.
  • FIG. 2 is a flowchart illustrating a method of calculating a valve packing friction force according to an embodiment of the present invention.
  • FIG. 3 is a flowchart illustrating a method of calculating a packing-stem friction coefficient and a packing stress in a method for calculating a valve packing friction force according to an embodiment of the present invention.
  • FIG. 1 is a diagram schematically showing the structure of a valve packing friction force calculation device according to an embodiment of the present invention.
  • the valve packing frictional force calculating device 100 includes a frictional force measuring unit 110 , a frictional coefficient calculating unit 120 , and an actual frictional force calculating unit 130 . can be configured.
  • the valve packing friction force calculation device 100 is a valve assembly 10 including a valve body 11 , a valve stem 12 , a valve actuator 13 , a valve packing 14 and a gland 15 . It is provided in and uses the packing-stem friction coefficient and packing stress of the valve packing 14 calculated from the change in the packing friction force measured by the friction force measuring unit 110 between the valve stem 12 and the valve packing 14 Thus, the actual frictional force calculator 130 may calculate the actual packing frictional force in consideration of the pressure caused by the flow of the fluid.
  • FIG. 1 shows an example in which the valve assembly 10 is a motor-operated valve (MOV) using a driving motor as the valve actuator 13, but configuring the valve assembly 10
  • the driving method of the valve actuator 13 is not limited thereto.
  • the friction force measuring unit 110 may measure the packing friction force between the valve stem 12 and the valve packing 14 through a static diagnostic test in a state in which the valve stem and the valve actuator are actually assembled.
  • the friction force measuring unit 110 measures the first packing friction force in the closing stroke in which the valve stem 12 closes the conduit while performing the static diagnostic test, and in the opening stroke in which the valve stem 12 opens the conduit. A second packing friction force may be measured.
  • the friction force measurement unit 110 measures the first packing friction force and the second packing friction force, or during the closing stroke and the opening stroke, the first packing friction force change and the first packing friction force from the measured first packing friction force and the second packing friction force 2 The change in packing friction force can be measured.
  • the friction coefficient calculator 120 is the packing of the valve packing 14 from the first packing friction force, the first packing friction force change, the second packing friction force, and the second packing friction force change measured from the friction force measuring unit 110 - stem Friction coefficient and packing stress can be calculated.
  • the actual frictional force calculator 130 may calculate the actual packing frictional force in consideration of the pressure due to the flow of the fluid flowing through the conduit from the packing-stem friction coefficient and the packing stress obtained from the friction coefficient calculator 120 .
  • valve packing frictional force calculating apparatus 100 calculates the actual packing frictional force in consideration of the pressure due to the flow of the fluid. will be described in detail.
  • FIG. 2 is a flowchart illustrating a method for calculating a valve packing friction force according to an embodiment of the present invention.
  • the friction force measuring unit 110 performs static diagnosis in a state in which the valve stem 12 and the valve actuator 13 are actually assembled. During the test, the packing friction force between the valve stem 12 and the valve packing 14 may be measured (S210, S220). Preferably, the frictional force measuring unit 110 may measure the packing frictional force by the strain gauge 111 installed on the valve stem 12 .
  • the friction force measuring unit 110 measures the first packing friction force in the closing stroke in which the valve stem 12 closes the conduit while performing the static diagnostic test (S210), and the valve stem 12 opens the conduit.
  • the second packing friction force may be measured in the opening stroke (S220).
  • the friction force measurement unit 110 measures the first packing friction force and the second packing friction force, or during the closing stroke and the opening stroke, the first packing friction force change and the first packing friction force from the measured first packing friction force and the second packing friction force 2 The change in packing friction force can be measured.
  • the friction coefficient calculator 120 is the packing of the valve packing 14 from the first packing friction force, the first packing friction force change, the second packing friction force, and the second packing friction force change measured from the friction force measuring unit 110 - stem
  • the friction coefficient and the packing stress may be calculated (S230).
  • the friction coefficient calculating unit 120 includes the first packing friction force, the first packing friction force change, the second packing friction force, the second packing friction force change, and the valve.
  • the packing-stem friction coefficient and packing stress may be calculated using the diameter of the stem 12 , the diameter of the gland 15 provided on the upper side of the valve packing 14 , and the height of the valve packing 14 .
  • FIG. 3 is a flowchart illustrating a method of calculating a packing-stem friction coefficient and a packing stress in a method for calculating a valve packing friction force according to an embodiment of the present invention.
  • the process in which the friction coefficient calculation unit 120 calculates the packing-stem friction coefficient and the packing stress includes the steps of calculating the packing-stem friction coefficient and the packing-bonnet friction coefficient (S231), and packing It can be divided into the step of calculating the stress (S232).
  • the friction coefficient calculator 120 may calculate the packing-stem friction coefficient and the packing-bonnet friction coefficient by using the first packing friction force change, the second packing friction force change, and the diameter of the valve stem and the gland. (S231).
  • the friction coefficient calculator 120 may calculate the packing-stem friction coefficient and the packing-bonnet friction coefficient using the following [Equation 1] to [Equation 4].
  • valve stem diameter is the ratio of the gland stress in the axial direction to the gland stress in the radial direction, is the change in packing stress, and is the ratio of the gland stress in the axial direction to the gland stress in the radial direction in the closing stroke and opening stroke, respectively.
  • valve stem diameter is the coefficient defined by .
  • the coefficient of friction calculator 120 calculates the first packing friction force while the valve stem 12 reciprocates inside the valve body 11 . and a second packing friction force. Measure the first packing friction force change through this and second packing friction change After measuring the first packing friction force change and second packing friction change Packing-stem friction coefficient from [Equation 1] to [Equation 4] using and packing-bonnet friction coefficient can be calculated.
  • the friction coefficient calculator 120 changes the first packing friction force and second packing friction change A constant representing the pressure distribution of the packing material from [Equation 1] to [Equation 4] using and can be calculated first.
  • the friction coefficient calculation unit 120 is a constant in [Equation 1] and [Equation 2] and After transforming the variables into the following [Equation 1-1] and [Equation 2-1], in the two equations and After erasing any one of them, the error function is performed using the following [Equation 3-1] As a method of minimizing the value of a function, or Either one can be obtained first.
  • the friction coefficient calculator 120 is calculated by the [Equation 1-1] to [Equation 3-1] and After calculating and Packing-stem friction coefficient from [Equation 3] and [Equation 4] using and packing-bonnet friction coefficient can be calculated.
  • the friction coefficient calculator 120 calculates the packing-stem friction coefficient and the packing-bonnet friction coefficient ( S231 ), and then the first packing friction force, the second packing friction force, the packing-stem friction coefficient and The packing stress may be calculated using the packing-bonnet friction coefficient (S232).
  • the friction coefficient calculator 120 may calculate the packing stress using the following [Equation 5] and [Equation 6].
  • the actual frictional force calculator 130 may calculate the actual packing frictional force in consideration of the pressure due to the flow of the fluid flowing through the conduit from the packing-stem friction coefficient and the packing stress (S240).
  • the actual frictional force calculator 130 may calculate the actual packing frictional force from the packing-stem friction coefficient and the packing stress using the following [Equation 7] and [Equation 8].
  • valve stem diameter , gland diameter , packing-stem friction coefficient and packing-bonnet friction coefficient is the coefficient defined by is a constant due to the pressure of the flow, which means a constant that considers the reduction of the contact pressure of the valve packing due to the flow pressure.
  • the actual frictional force calculator 130 is the packing-stem friction coefficient obtained by [Equation 1] to [Equation 6] and packing stress is a constant by the pressure of the flow by substituting in Equation 7 above After finding the packing-stem friction coefficient , packing stress and constant by the pressure of the flow By substituting [Equation 6] above, the actual friction force can be calculated.
  • the packing friction force and the packing friction force measured while the valve stem and the valve actuator are actually assembled while performing a static diagnostic test are obtained from the packing-stem After calculating the friction coefficient and packing stress, based on this, the actual packing friction force is calculated based on the pressure caused by the flow of the fluid. The actual packing friction force by the pressure of the flow can be more easily calculated.
  • the present invention relates to a method for calculating the friction force of a valve packing, and more particularly, the change in the friction force of the packing due to the pressure of the flow by a static diagnostic test without performing a dynamic diagnostic test in a state in which the valve stem and the valve actuator are actually assembled. It is applicable to the technical field related to the method of calculating the valve packing friction force that can be easily and accurately calculated.

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Abstract

La présente invention concerne un procédé pour le calcul d'une force de frottement de garniture de vanne. Un procédé pour le calcul d'une force de frottement de garniture de vanne, selon un mode de réalisation de la présente invention, est un procédé pour le calcul de la force de frottement de garniture de vanne d'un ensemble vanne comprenant : un corps de vanne ayant une conduite pour raccorder une entrée et une sortie ; une tige de vanne pour ouvrir/fermer de manière sélective la conduite lorsque la tige effectue un va-et-vient à l'intérieur du corps de vanne ; un actionneur de vanne pour entraîner la tige de vanne d'une manière en va-et-vient ; une garniture de vanne pour maintenir une étanchéité à l'air entre la tige de vanne et le corps de vanne ; et un presse-étoupe pour presser la garniture de vanne dans la direction axiale de la tige de vanne, le procédé comprenant les étapes consistant à : mesurer une première force de frottement de garniture pendant une opération de fermeture au cours de laquelle la tige de vanne ferme la conduite, par l'intermédiaire d'un essai de diagnostic statique dans un état dans lequel la tige de vanne et l'actionneur de vanne sont réellement assemblés ; mesurer une seconde force de frottement de garniture pendant une opération d'ouverture au cours de laquelle la tige de vanne ouvre la conduite, tandis que le essai de diagnostic statique est réalisé ; calculer le coefficient de frottement tige-garniture et la contrainte de garniture de la garniture de vanne à partir de la première force de frottement de garniture, le changement dans la première force de frottement de garniture par rapport à la première force de frottement de garniture, la seconde force de frottement de garniture, et le changement dans la seconde force de frottement de garniture par rapport à la seconde force de frottement de garniture ; et calculer, à partir du coefficient de frottement tige-garniture et de la contrainte de garniture, une force de frottement de garniture réelle obtenue par la considération de la pression générée au moyen de l'écoulement de fluide s'écoulant dans la conduite.
PCT/KR2021/003745 2021-01-14 2021-03-26 Procédé de calcul de force de frottement de garniture de vanne WO2022154170A1 (fr)

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KR10-2021-0005375 2021-01-14

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR860000552A (ko) * 1984-06-19 1986-01-29 지. 씨. 도어먼 밸브 패킹의 누출 측정장치
JPH11258115A (ja) * 1998-03-09 1999-09-24 Nikkiso Co Ltd バルブパッキン試験装置
JP2005083504A (ja) * 2003-09-09 2005-03-31 Kansai Electric Power Co Inc:The 電動弁装置の保守管理システム
KR20130017885A (ko) * 2011-08-12 2013-02-20 한국수력원자력 주식회사 밸브패킹 마찰계수 시험장치 및 그 방법
KR101678029B1 (ko) * 2015-08-28 2016-11-21 한국기계연구원 공기구동밸브 구동기 모사장치

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10040114A1 (de) * 2000-08-17 2002-02-28 Bosch Gmbh Robert Verbindung zwischen einem Schaftende eines Gaswechselventils einer Brennkraftmaschine und einem Stellglied eines Ventilstellers
JP3779658B2 (ja) * 2002-09-05 2006-05-31 日本原子力発電株式会社 制御弁に用いるグランドパッキンの性能診断装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR860000552A (ko) * 1984-06-19 1986-01-29 지. 씨. 도어먼 밸브 패킹의 누출 측정장치
JPH11258115A (ja) * 1998-03-09 1999-09-24 Nikkiso Co Ltd バルブパッキン試験装置
JP2005083504A (ja) * 2003-09-09 2005-03-31 Kansai Electric Power Co Inc:The 電動弁装置の保守管理システム
KR20130017885A (ko) * 2011-08-12 2013-02-20 한국수력원자력 주식회사 밸브패킹 마찰계수 시험장치 및 그 방법
KR101678029B1 (ko) * 2015-08-28 2016-11-21 한국기계연구원 공기구동밸브 구동기 모사장치

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