WO2019131536A1 - Procédé d'inspection de la résistance à la pression d'un instrument de pression tel qu'une valve, dispositif d'inspection de sa résistance à la pression et instrument de pression - Google Patents

Procédé d'inspection de la résistance à la pression d'un instrument de pression tel qu'une valve, dispositif d'inspection de sa résistance à la pression et instrument de pression Download PDF

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Publication number
WO2019131536A1
WO2019131536A1 PCT/JP2018/047327 JP2018047327W WO2019131536A1 WO 2019131536 A1 WO2019131536 A1 WO 2019131536A1 JP 2018047327 W JP2018047327 W JP 2018047327W WO 2019131536 A1 WO2019131536 A1 WO 2019131536A1
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WIPO (PCT)
Prior art keywords
pressure
inspection
valve
work
gas
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PCT/JP2018/047327
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English (en)
Japanese (ja)
Inventor
直樹 吉良
達幸 花岡
忠茂 三井
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株式会社キッツ
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Application filed by 株式会社キッツ filed Critical 株式会社キッツ
Priority to CN201880083851.3A priority Critical patent/CN111512133B/zh
Publication of WO2019131536A1 publication Critical patent/WO2019131536A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
    • G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M99/00—Subject matter not provided for in other groups of this subclass

Definitions

  • the present invention relates to, for example, a pressure resistance inspection method of pressure equipment to which pressure is applied from inside such as a valve, a pressure resistance inspection apparatus thereof, and the pressure equipment.
  • a pressure resistance test (shell test) is performed on the pressure devices before shipment to confirm the strength and the presence or absence of a leak.
  • this pressure test is usually performed after the completion of the assembly of the pressure device, thereby confirming the pressure resistance of the valve used as a product.
  • a submersion method, a sniffer method, a vacuum chamber method and the like are known as this type of pressure resistance inspection method.
  • the submersion method immerses a test body whose inside is pressurized with gas in water and detects leaks by bubbles from the inside of the test body, and the sniffer method puts a search gas in the test body and the outside of the test body. The probe is brought close to the gas flowing out to detect leaks with this probe.
  • the vacuum chamber method a test body is housed in a vacuum vessel, a search gas is introduced into the test body, and a gas flowing out of the test body into the vacuum vessel is detected.
  • test body is a ball valve and this ball valve is subjected to a pressure test by the submersion method
  • a casting that constitutes the valve by applying an air pressure of about 1.2 MPa inside with the entire ball valve submerged Check for leaks from parts and leaks from each seal area.
  • an O-ring which is a self-sealing seal member, is used for the stem seal portion of the stem, and this O-ring moves in the mounting groove when air pressure is applied, and the seal Demonstrate the nature.
  • the applicant before applying the high air pressure of 1.2 MPa, applies a low air pressure of about 0.2 MPa to the inside of the valve, and does not cause elastic deformation due to the movement of the O ring. Leakage from the stem due to machining defects or molding defects, that is, the presence or absence of shaft leakage is confirmed.
  • the partial inspection near the axial leak site is then carried out in the same inspection space as the overall inspection of the entire valve, i.e. the space surrounding the entire valve. This inspection procedure is the same for other pressure resistance tests such as the sniffer method and the vacuum chamber method, and shaft leakage is confirmed before overall inspection to confirm leakage from cast parts and seal locations. Partial examinations are performed in the same examination space as the whole examination.
  • inspection apparatus of patent document 1 As a pressure
  • the inspection fluid is supplied into the fluid controller to pressurize the inside while the fluid controller such as a valve assembled as a unit is disposed in the inspection chamber.
  • the test fluid that has leaked from the fluid controller into the test chamber is detected by a leak detector connected in communication with the test chamber, whereby the pressure resistance of the fluid controller can be confirmed.
  • Patent No. 3325357 gazette
  • the pressure resistance test such as the submersion method, the sniffer method, and the vacuum chamber method
  • the pressure resistance test is performed on the valve after the assembly is completed. Therefore, even if the partial inspection for shaft leak confirmation fails before the general inspection for confirmation of processing defects or molding defects, the same procedure as in the case of the overall inspection is necessary. Become. Specifically, it is necessary to remove the valve body, the stem, the seal parts, etc. from the body, disassemble the entire valve, repair or replace the defective part, and reassemble it in a highly accurate seal state. For this reason, disassembly and assembly time will take extra time.
  • the stem is pre-rotated to half-open the valve, and in the valve cavity, for example, in the case of a floating ball valve, ball valve body, ball seat, body, cap It is necessary to fill the inspection gas such as hydrogen up to the space surrounded by For this reason, the procedure at the time of a pressure
  • the present invention has been developed in order to solve the conventional problems, and the purpose of the present invention is to make it possible to perform a pressure check on the way of assembling pressure devices such as valves, and to exhaust gas for inspection quickly. It is an object of the present invention to provide a pressure device inspection method of pressure equipment which can carry out a pressure resistance inspection, and a pressure equipment such as a pressure inspection device and a valve thereof.
  • the invention according to claim 1 is a pressure resistance inspection method for supplying a search gas to a work made of pressure equipment such as a valve to detect the presence or absence of a leak, which is a part of component parts of the work Immediately after that, the inspection target portion of the workpiece is covered with the volume of the inspection space reduced and the search gas is enclosed in the workpiece to detect the presence or absence of the search gas leak in the inspection space
  • a pressure resistance inspection method of pressure equipment such as a valve that detects defects and processing defects of a workpiece at an early stage.
  • the invention according to claim 2 is the pressure resistance inspection method of pressure equipment such as a valve constituted by using a cast part.
  • the invention according to claim 3 is a pressure resistance inspection method of pressure equipment such as a valve including a seal portion by an O-ring at a portion to be inspected of a work.
  • the invention according to claim 4 is a pressure resistance inspection method of pressure equipment such as a valve including a stem shaft seal portion of a valve at a workpiece inspection target portion.
  • the invention according to claim 5 incorporates all the components to which pressure is applied to the workpiece after the pressure proof preliminary inspection of the workpiece, and provides a large inspection space covering the entire workpiece and enclosing the search gas in the workpiece to perform a large inspection.
  • This is a method of checking the pressure resistance of pressure equipment such as a valve that is designed to perform a main pressure inspection to detect the presence or absence of a search gas leak in a space.
  • the invention according to claim 6 has an inspection space partially having an open part capable of desorbing a work comprising a pressure device such as a valve, and a leak of the search gas supplied into the work in the inspection space.
  • a gas sensor for detecting is provided, and the residual gas of the inspection space is discharged in a state where the gas sensor is retracted to the side from the inspection target part of the workpiece, the pressure of a valve etc. for inspecting the next workpiece quickly and accurately It is a pressure resistance inspection device of equipment.
  • the gas sensor is provided inside a semi-open type chamber whose bottom is opened, and in this chamber, there is provided a valve or the like provided with an inspection space surrounding a portion to be inspected of a workpiece. It is a pressure check device for pressure equipment.
  • the invention according to claim 8 is a pressure resistance inspection apparatus for pressure equipment such as an inspection space or a valve provided with an exhaust fan on the space side where a search gas is evacuated from a gas sensor.
  • the invention according to claim 9 is the pressure resistance inspection device for pressure equipment such as a valve which is a hydrogen gas and the search gas supplied into the work.
  • the invention according to claim 10 is a pressure resistance inspection apparatus for pressure equipment such as a valve provided with a purge flow path for purging search gas in a workpiece with air pressure after the inspection is completed and discharging it to the outside of the inspection space.
  • the invention according to claim 11 is a pressure resistance inspection apparatus for pressure equipment such as a valve in which the advancing and retreating direction of the chamber and the advancing and retreating direction of the clamp jig holding the work are the same direction.
  • the invention according to claim 12 is the pressure device, which is a pressure device such as a valve, as the object to be inspected in the pressure resistance inspection device.
  • the search gas is enclosed in the work in a state where the volume of the inspection space is reduced and the presence or absence of the search gas leak is detected as the pressure proof preliminary inspection, the search gas is filled compared to the finished product of the work. There is little volume.
  • the residual gas after inspection can be discharged quickly, and the pressure resistance inspection can be performed continuously and in a short time. Since the search gas can be filled into the work in the process of assembly, the pressure resistance test can be performed without any modification to the work.
  • defects such as core displacement at the time of casting can be found at an early stage, and it becomes possible to immediately coat the inspection completed portion after the pressure resistance inspection.
  • the third aspect of the present invention it is possible to confirm the presence or absence of a partial leak such as a shaft leak caused by a processing defect or a molding defect by performing a pressure resistance inspection while suppressing elastic deformation due to the movement of the O ring. Become.
  • the pressure resistance inspection of the stem shaft seal portion of the valve can be performed immediately with the stem inserted, regardless of the rotational position of the stem.
  • a pressure resistance main inspection which is an overall inspection for checking a leak from each seal portion This makes it easy to identify the location of a defect such as a leak. Moreover, these partial and global inspections can be performed quickly in the same inspection space with a minimum of search gas.
  • the invention of claim 6 it is possible to carry out continuous pressure resistance inspection while detaching the work from the inspection space through the opening.
  • the gas sensor provided in the inspection space is evacuated from the inspection target site of the workpiece
  • the residual gas of the inspection space is discharged to prevent the search gas from remaining near the inspection target site of the workpiece after inspection. This residual gas can be quickly expelled from the inspection space, and the next workpiece can be inspected quickly and quickly.
  • an inspection space surrounding the inspection target portion of the workpiece is provided, and the inspection of the workpiece is performed in the inspection space of this small volume at the time of withstand pressure inspection. It is possible to accurately detect gas leakage from the target site. After inspection, by moving the chamber, the gas accumulated around the workpiece can be easily and quickly discharged.
  • the gas released by the unclamping of the work after inspection can be exhausted to the outside through the exhaust fan, and the next work can be quickly and accurately subjected to pressure proof inspection.
  • the hydrogen gas is a diffusive gas
  • the pressure sensor can be reliably detected by the gas sensor and the withstand voltage inspection can be performed with high accuracy. Thereby, even low concentration gas can be detected with high sensitivity.
  • the search gas sealed in the work can be quickly discharged through the purge flow path, and the work can be replaced with the next work for inspection immediately after the inspection to shorten the time while the additional inspection is possible. It becomes.
  • the entire apparatus can be made compact.
  • the object to be inspected in the pressure resistance inspection apparatus as pressure equipment such as a valve, there is leakage from parts such as casting parts constituting the valve and leakage from each sealing portion It is possible to accurately check the presence or absence of shaft leakage caused by processing defects and molding defects, and to provide pressure devices such as high-precision valves excellent in pressure resistance.
  • FIG. 1 It is a schematic sectional drawing which shows a pressure
  • FIG. 1 is a schematic cross-sectional view of a pressure resistance inspection device
  • FIG. 2 shows a pressure resistance inspection state of pressure equipment by the pressure resistance inspection device
  • FIG. 3 is a flowchart of inspection steps of the pressure resistance inspection method in the present embodiment.
  • the apparatus main body 1 shown in FIG. 1 supplies the search gas to the work 2 which is the inspection object, and can carry out the pressure proof inspection of the work 2, more specifically, the pressure proof preliminary inspection before the main pressure proof inspection described later. It has the frame 10, the chamber 11, the gas sensor 12, the support jig 13, and the clamp jig 14.
  • the frame 10 is formed in a frame shape in which the work 2 can be mounted inside, and an inspection space R for performing a pressure resistance test of the work 2 is provided inside thereof.
  • An opening 20 is provided in a part of the frame 10, and the work 2 can be detached from the opening 20 from the right side or the near side of the frame 10 in FIG.
  • two exhaust fans 21 indicated by alternate long and short dash lines are attached to the back side of the frame 10 through a plate or the like (not shown), and the exhaust fan 21 can exhaust air in the inspection space R by rotation.
  • the chamber 11, the support jig 13, and the clamp jig 14 are attached to the inside of the frame 10.
  • the chamber 11 has a substantially rectangular cover portion 23 of a size that can accommodate the inspection target portion 22 of the work 2 inside, and a hanging portion 24 integrally provided on the upper surface side of the cover portion 23. It is provided to be able to move forward / backward and up / down in the inspection space R via the lowering portion 24.
  • the chamber 11 is of a semi-open type in which the bottom is opened, and the inspection target portion 22 of the workpiece 2 can be guided into the chamber 11 from the bottom side.
  • an inspection space S having a predetermined volume is provided, and in the state where the inspection target portion 22 is surrounded by the inspection space S, the pressure resistance inspection can be performed.
  • a gas sensor 12 and an exhaust fan 26 are attached to the chamber 11.
  • the inspection space S of the chamber 11 is a space where the search gas supplied to the workpiece 2 can diffuse, and is provided in a state of being isolated from the outside.
  • the “in a state of being isolated from the outside” in the present embodiment does not mean that the inside of the chamber 11 is sealed, and prevents the influence of an external wind and the like from affecting the work 2 and the inside of the chamber 11. This is a state in which the flow of gas can be permitted such that hydrogen leaked from the work 2 reaches the gas sensor 12 within the inspection time.
  • the gas sensors 12 are respectively provided at predetermined plural places inside the chamber 11, two places on the inner side surface of the chamber 11 in this example, and one place on the upper surface inside the chamber 11, and search gas supplied into the work 2 by these gas sensors 12
  • the leak from the inspection target site 22 can be detected in the chamber 11.
  • the number of gas sensors 12 can be set arbitrarily, and if the number is increased, detection capability can be improved and detection time can be shortened or automated.
  • the gas sensor 12 is provided so as to be retractable laterally from the inspection target portion 22 of the workpiece 2 with the movement of the chamber 11. After the pressure check, by discharging the residual gas of the inspection space R in the retracted state of the gas sensor 12, it is possible to inspect the next workpiece 2 quickly and accurately.
  • the gas sensor 12 in the present embodiment is a hydrogen sensor, which makes it possible to detect a hydrogen gas described later which is a search gas supplied into the work 2. By using this hydrogen sensor 12, the leak of hydrogen in the mixed gas of hydrogen and nitrogen, which is a diffusible gas, is reliably detected.
  • the gas sensor 12 is fixed to the chamber 11, but may be movably attached to adjust the position.
  • Helium gas can also be used as the search gas, and in this case, a gas thermal conductivity sensor may be used as the gas sensor.
  • the gas sensor 12 is a module that outputs a voltage according to the concentration of leaked hydrogen by applying a predetermined voltage. Before the inspection, it is necessary to finely adjust the sensitivity according to the warm-up state of the gas sensor 12 and the change of the hydrogen concentration in the atmosphere by changing the output voltage by the volume for resistance adjustment.
  • a commercially available semiconductor-type sensor capable of outputting an analog signal (0-5 V) is used as the gas sensor 12, and for example, a heat-wire-type semiconductor-type hydrogen sensor is used.
  • the hydrogen sensor 12 is a sensor that utilizes a change in electrical conductivity due to adsorption of hydrogen gas on the surface of a metal oxide semiconductor such as stannic oxide (SnO 2 ). In this case, the output voltage becomes logarithmic with respect to the gas concentration, enabling high sensitivity output even at low concentration.
  • the exhaust fan 26 is provided on the space side of the chamber 11 where the search gas is evacuated from the gas sensor 12.
  • the exhaust fan 26 enables the hydrogen gas remaining in the inspection space S in the chamber 11 to be discharged to the outside.
  • a throttling portion 27 for throttling the flow path is provided between the exhaust fan 26 and the inspection space S. At the time of exhausting by the exhaust fan 26, the residual gas in the chamber 11 is efficiently purged by increasing the exhausting speed through the narrowed portion 27.
  • the support jig 13 is provided on the frame 10 at a predetermined interval at which both sides of the work 2 can be mounted, and can support the work 2 from the lower side.
  • the mounting surface 28 on the upper surface side of the support jig 13 has a tapered or cylindrical valve side capable of holding the side of the valve (workpiece 2) which is a polygonal shape such as a hexagon or an octagon. It is provided in an appropriate shape such as an arc shape that can be held.
  • the clamp jig 14 has a fixed clamp jig 30 and a movable clamp jig 31.
  • the fixed clamp jig 30 is disposed at a position on the primary side of the work 2 via the fixing holder 32, and a primary for supplying a search gas to the inside of the work 2 near the center of the fixed clamp jig 30.
  • Side channel 33 is formed.
  • a seal member 34 made of a ring-shaped gasket is mounted on the surface of the fixed clamp jig 30 opposite to the primary side of the work 2, and this gasket 34 makes it possible to press the work 2 against the work 2 when the work 2 is fixed. Leakage is prevented.
  • the movable clamp jig 31 is disposed on the secondary side of the work 2, and is mounted so as to be able to move forward and backward in the tightening direction so as to be able to hold the work 2 by the fixed clamp jig 30.
  • the advancing and retracting direction of the chamber 11 described above and the advancing and retracting direction of the movable clamp jig 31 which is a clamp jig of the work 2 are arranged in the same direction.
  • a secondary flow passage 35 which is a purge flow passage, is provided inside the movable clamp member 31, and after the pressure resistance inspection of the work 2, the search gas in the work 2 is purged by air pressure via the purge flow passage 35. , And are discharged to the outside of the inspection space S and the inspection space R.
  • a seal member 34 made of a ring-shaped gasket is mounted on the surface of the movable clamp jig 31 facing the secondary side of the work 2.
  • the gasket 34 prevents leakage from the pressure-contacting portion with the movable clamping jig 31 when the work 2 is fixed.
  • the workpiece 2 which is an inspection object to be inspected by the apparatus main body 1 is pressure equipment such as a valve, and in this embodiment, the inspection object is a ball valve and a part of components of the ball valve is assembled.
  • the state thing is used.
  • the work 2 is constituted by using a body 40 which is a cast part, and a stem 42 for rotational operation is inserted into and attached to a barrel portion 41 formed on the body 40, and a packing presser 43 is attached from above. 42 are rotatably provided in the positioning state.
  • O-rings 45 are mounted at two positions around the stem 42, and the seal portion 46 is provided by these O-rings 45.
  • the work portion 2 is a ball valve. It becomes a seal part.
  • a gas containing hydrogen is used as a search gas supplied to the work 2 at the time of the valve seat inspection and the pressure resistance inspection, and among them, 5% hydrogen is inactive as the diffusive gas.
  • Hydrogen gas which is a mixed gas containing 95% nitrogen as a gas is used. This mixed gas has the property of leaking out from the vicinity of the screwed portion between the cylindrical portion 41 of the body 40 and the packing presser 43 when there is an external leak during the pressure test.
  • the mixed gas of 5% hydrogen and 95% nitrogen which is a search gas, is a noncombustible high-pressure gas, so it can be used safely.
  • the search gas may be a gas other than a gas containing hydrogen, and for example, various gases such as helium gas and methane gas can be used.
  • helium gas is used as the search gas, the diffusivity is high as in the mixed gas containing hydrogen.
  • FIG. 3 shows an example of the inspection line 50 provided with the apparatus main body 1 when the work 2 is a ball valve.
  • a flow path from the hydrogen gas supply side to the primary side of the apparatus main body 1 is a first flow path 51, and a flow path after the secondary side of the apparatus main body 1 is a second flow path 52.
  • the inspection line 50 has a hydrogen gas supply source 53, a regulator 54, a purge air supply source 55, solenoid valves 56, 57, 58, 59, a pressure gauge 60, and a pressure sensor 61 in addition to the above-described apparatus body 1. .
  • the hydrogen gas supply source 53 is provided to be able to supply hydrogen gas from the first flow path 51 of the inspection line 50 to the work 2, and the hydrogen gas adjusted to about 0.2 MPa is supplied to the solenoid valve 56 via the regulator 54. Be done.
  • the solenoid valve 56 is provided so as to be capable of supplying hydrogen gas into the workpiece 2 at the time of pressure resistance inspection by its opening and closing operation.
  • the purge air supply source 55 is provided so as to be able to supply purge air at a pressure of about 0.6 MPa from the first flow path 51 to the workpiece 2 and purge air is supplied into the workpiece 2 after completion of the pressure check by opening and closing the solenoid valve 57.
  • a vacuum flow passage 62 is provided between the solenoid valves 56 and 57 and the fixed clamp 30, and the hydrogen gas or purge air in the first flow passage 51 is externally output by opening and closing the solenoid valve 58 through the vacuum flow passage 62. To be drainable. Vacuuming of the first flow path 51 is performed by exhausting the internal pressure and pressure suction from the outside.
  • An exhaust flow path 63 is provided in the second flow path 52, and the exhaust flow path 63 is provided so as to be able to open and close by a solenoid valve 59.
  • a pressure gauge 60 and a pressure sensor 61 are provided, and the pressure of hydrogen gas in the work 2 can be measured via these.
  • a control unit including a CPU (central processing unit) is connected to the inspection line 60, and the control unit includes the gas sensor 12, electromagnetic valves 56 to 59, a hydrogen gas supply source 53, a purge air supply source 55 and the like. Each element is electrically connected.
  • the control unit stores a table (installation data) set based on the nominal pressure, nominal diameter, valve type and the like of the work 2 and the operation of each unit is controlled based on this table.
  • control unit is provided with a digital display unit, and when hydrogen leaks from the work 2, this digital display unit is a voltage corresponding to the hydrogen gas concentration via a signal processing unit provided in the control unit. It is output.
  • the digital display unit has an LCD (Liquid Crystal Display), and the output voltage of each gas sensor 12 is displayed as an indicator on this LCD.
  • the pressure resistance inspection method in the present embodiment is based on, for example, each air pressure test of a valve box pressure resistance inspection specified in JIS B 2003 (inspection general rule of a valve).
  • a withstand pressure preliminary inspection to partially inspect the components of the work 2 and an overall inspection of the entire work 2 and each seal portion There is a main pressure test to be conducted, and these should be carried out continuously.
  • the body 40, the stem 42, the O-ring 45, and the packing presser 43 which are part of the components of the work 2, are integrally assembled into a semi-finished state.
  • the work 2 is placed on the support jig 13 while the primary side of the semi-finished work 2 including at least the seal portion between component parts is in contact with the gasket 34 of the fixed clamp jig 30.
  • the movable clamp jig 31 is moved from the secondary side of the work 2 in the holding direction to clamp the work 2 at a predetermined position.
  • the gaskets 34 and 34 respectively seal on the primary and secondary side end portions of the work 2 to prevent leakage, and the primary and secondary sides of the fixed clamp jig 30 on the primary and secondary side opening sides of the work 2
  • the flow path 33 can communicate with the purge flow path 35 of the movable clamp jig 31.
  • FIG. 5 shows the process of the withstand voltage preliminary inspection after holding the work 2.
  • all the gas sensors 12 in FIG. 1 are zero-adjusted, and the acceptance criteria of these gas sensors 12 are stored in the CPU.
  • This state is a standby state before the start of the inspection, and the withstand voltage preliminary inspection starts by the input of the inspection start signal.
  • the chamber 11 is advanced and lowered, and the seal portion by the O-ring which is the inspection target portion 22 of the work 2, that is, the stem cylinder portion 41 of the body 40 including the stem shaft seal portion 46 of the valve 2. Is covered by the chamber 11.
  • the inspection target portion 22 of the workpiece 2 is surrounded in a state where the volume of the inspection space S is reduced.
  • hydrogen gas as a search gas is supplied into the work 2, hydrogen gas is sealed in the work 2 and pressurized, and the presence or absence of hydrogen gas leakage in the inspection space S in the chamber 11 is detected.
  • the withstand voltage preliminary inspection is controlled by the CPU in FIG. 5 as follows. If the pressure value (the pressure value in the workpiece 2) measured by the pressure sensor 61 in the inspection line 50 in FIG. 3 is smaller than the specified pressure, the end (NG) is obtained, and an NG signal is output to enter the initial state. Return. On the other hand, when the measured pressure value is equal to or higher than the specified pressure, the process proceeds to the next pressure drop detection step. At this time, the supply of hydrogen gas is stopped.
  • the pressure drop detection step it is confirmed that the measurement value (pressure value in the workpiece 2) by the pressure sensor 61 is larger than 97% of the initial value after stopping the pressurization by hydrogen gas, and in this state, The pressure of the inspection space S is measured by the gas sensor 12 in the next step of pressure leak detection. This measurement is continued until the measurement value of the pressure sensor 61 becomes 97% or less of the initial value, and when it becomes 97% or less, it is considered that the pressure inside the workpiece 2 has dropped to a pressure value unsuitable for inspection, At the end (NG), an NG signal is output to return to the initial state. In this case, the workpiece 2 fails the pressure proof inspection.
  • the process proceeds to the next detection time measurement step.
  • the measured value of the gas sensor 12 becomes equal to or more than the threshold of leakage, it is considered that the pressure leakage has been detected from the work 2, and the end (NG) is obtained, and an NG signal is output to return to the initial state. In this case, the workpiece 2 fails the pressure proof inspection.
  • the detection time measurement step it is measured whether or not a preset detection time has elapsed, and if it does not reach a predetermined detection time, it is fed back to the pressure drop detection step.
  • the steps from the pressure drop detection step to the detection time measurement step are looped repeatedly until the detection time of the detection time measurement step reaches a predetermined time. If NG does not occur in the pressure drop detection step and the pressure drop detection step until the predetermined time is reached, the hydrogen gas leak under the predetermined pressure is maintained below the reference value, and the workpiece 2 is against the pressure drop preliminary inspection. Pass.
  • the chamber 11 is raised and retracted relative to the inspection target portion 22 of the work 2, and vacuum is performed from the vacuum flow path 62 while supplying purge air into the work 2, so that the inside of the work 2 in a sealed state is obtained.
  • the work 2 is removed from the apparatus main body 1 by unclamping in which the movable clamp jig 31 is moved in the direction of separating the movable clamp jig 31 from the work 2.
  • the search gas in the inspection space S is discharged to the inspection space R by the exhaust fan 26, and the search gas in the inspection space R is discharged to the outside by the exhaust fan 21. To prevent the remaining of search gas.
  • the same procedure as the inspection method may be performed.
  • valve body 70 the ball seat 71 and the cap 72 are integrated and integrated into the partially assembled work 2
  • handle 75 is fixed via a washer 73 and a nut 74, and a work (valve) 80 in a state of being used as a product is provided.
  • the workpiece 80 is held by a clamp jig in a large inspection space in a large inspection apparatus (not shown), and the main pressure proof inspection is performed in a state in which the entire workpiece 80 is covered in the large inspection space.
  • a search gas consisting of hydrogen gas is enclosed in the work 80 including the valve cavity Ca, and the search gas leaks
  • the presence or absence of the workpiece is detected by the gas sensor to determine pass or fail of the main pressure test of each workpiece.
  • a workpiece that passes both the above-described pressure-resistant preliminary inspection and this main pressure-sensitive inspection is a product that has passed the pressure-resistant inspection. If it is determined that the main pressure check is a failure, the cause location may be confirmed except for the seal region that has passed the pressure check, and the cause location can be identified quickly. After the pressure check, the inside of the work is purged to discharge the residual gas, and then the clamping jig is loosened to remove the work.
  • a pressure proof test is conducted as a pressure proof test, and this pressure proof test is a state in which the stem 42 with the O-ring 45 mounted is attached to the body 40 and the valve in which a part of this component is assembled is targeted.
  • the pressure proof inspection fails, it is possible to remove the stem 42 from the body 40 and easily carry out the repair or repair of the troubled part.
  • by performing the pressure proof preliminary inspection on the state of the semifinished product before the finished product of the valve as the work 2 it is possible to shorten the disassembly and assembly time associated with the failure.
  • the workpiece 2 in the pressure proof preliminary inspection is a cast part, and the inspection target portion 22 is a portion including the seal portion by the O-ring 45, in this embodiment, the stem shaft seal portion 46 of the valve.
  • the leak is measured by the gas sensor 12 in the inspection space S in the space 11.
  • the volume of the inspection space S can be minimized to reduce the retention area of hydrogen gas, and the residual gas can be quickly discharged by the exhaust fan 26 on the evacuation space side of the hydrogen gas.
  • the discharged gas is discharged to the outside of the inspection space R by the two exhaust fans 21 attached to the frame 10. At this time, since the amount of residual gas from the inspection space S is small, the gas can be quickly discharged from the inspection space to the outside of the apparatus main body 1, and the inspection space S and the inspection space R can be cleaned in a short time.
  • valve body 70 and the ball seat 71 are not incorporated in the work 2 at the time of the pressure proof inspection, there is no need to rotate the stem 42 and hydrogen gas up to the stem shaft seal portion 46 regardless of the rotation state of the stem 42
  • the pressure resistance can be checked without requiring extra work.
  • valve body 2 which is a semi-finished product after pressure proof preliminary inspection, without incorporating this body 2 into the state of the valve finished product, it is a cast iron part at an early stage and it is easy to rust It can prevent rusting.
  • the present invention can be applied to valves other than ball valves such as globe valves and gate valves, and can be applied to various pressure devices such as pneumatic actuators including piping devices other than valves.
  • the amount of leakage may be measured instead of the presence or absence of leakage. After the main pressure inspection, the valve seat inspection may be performed continuously.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Examining Or Testing Airtightness (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)

Abstract

L'invention concerne : un procédé d'inspection de la résistance à la pression d'un instrument de pression dans lequel il est possible d'inspecter une résistance à la pression pendant l'assemblage de l'instrument de pression, tel qu'une soupape, et d'inspecter la résistance à la pression en un court laps de temps en évacuant rapidement un gaz d'inspection ; un dispositif d'inspection de la résistance à la pression de l'instrument de pression ; et un instrument de pression tel qu'une valve. Afin d'atteindre l'objectif ci-dessus, un gaz de recherche est fourni à une pièce à travailler (2) comprenant l'instrument de pression tel qu'une valve, et une détection est faite pour savoir si une fuite s'est produite ou non. On obtient un état dans lequel certains des éléments constitutifs de la pièce à travailler (2) sont assemblés, un site à inspecter (22) de la pièce à travailler (2) est immédiatement recouvert dans un état dans lequel le volume d'un espace d'inspection (S) est réduit, le gaz de recherche est scellé dans la pièce à travailler (2) et une inspection préliminaire de la résistance à la pression est effectuée, dans laquelle une détection est faite pour savoir s'il existe ou non une fuite du gaz de recherche dans l'espace d'inspection (S), moyennant quoi tout défaut et un traitement inférieur de la pièce à travailler (2) sont détectés rapidement.
PCT/JP2018/047327 2017-12-27 2018-12-21 Procédé d'inspection de la résistance à la pression d'un instrument de pression tel qu'une valve, dispositif d'inspection de sa résistance à la pression et instrument de pression WO2019131536A1 (fr)

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CN201880083851.3A CN111512133B (zh) 2017-12-27 2018-12-21 阀等压力设备的耐压检查方法

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JP2017-251325 2017-12-27
JP2017251325A JP6608418B2 (ja) 2017-12-27 2017-12-27 バルブなどの圧力機器の耐圧検査方法

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TWI689715B (zh) 2020-04-01
JP6608418B2 (ja) 2019-11-20
JP2019117122A (ja) 2019-07-18
TW201937143A (zh) 2019-09-16
CN111512133B (zh) 2023-11-21

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