CN114008432A - Pressure resistance inspection device for valve - Google Patents
Pressure resistance inspection device for valve Download PDFInfo
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- CN114008432A CN114008432A CN202080041936.2A CN202080041936A CN114008432A CN 114008432 A CN114008432 A CN 114008432A CN 202080041936 A CN202080041936 A CN 202080041936A CN 114008432 A CN114008432 A CN 114008432A
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- 238000007689 inspection Methods 0.000 title claims abstract description 82
- 238000012360 testing method Methods 0.000 claims abstract description 188
- 238000001514 detection method Methods 0.000 claims abstract description 56
- 238000004891 communication Methods 0.000 claims abstract description 9
- 238000007789 sealing Methods 0.000 claims abstract description 7
- 238000010926 purge Methods 0.000 claims description 28
- 238000007664 blowing Methods 0.000 claims description 3
- 238000005192 partition Methods 0.000 abstract description 3
- 239000003570 air Substances 0.000 description 160
- 239000007789 gas Substances 0.000 description 124
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 16
- 239000001257 hydrogen Substances 0.000 description 14
- 229910052739 hydrogen Inorganic materials 0.000 description 14
- 230000002093 peripheral effect Effects 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000001307 helium Substances 0.000 description 5
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- 239000004065 semiconductor Substances 0.000 description 5
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- 150000002431 hydrogen Chemical class 0.000 description 4
- 230000000149 penetrating effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000013100 final test Methods 0.000 description 3
- 230000008595 infiltration Effects 0.000 description 3
- 238000001764 infiltration Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
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- 230000002452 interceptive effect Effects 0.000 description 1
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- 229910044991 metal oxide Inorganic materials 0.000 description 1
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Images
Classifications
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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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/003—Machine valves
-
- 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
Abstract
Provided is a pressure resistance inspection device for a valve, which can set a leak inspection space to be small so that detection of a leak detection gas is easy, and which can accurately inspect a part or all of a leak from a valve under test in a short time by preventing permeation of external gas into the space, and which can continuously perform pressure resistance inspection for different valves under test. The disclosed device is provided with: a cover body (30) which surrounds a part or the whole of the test valve (2) in a non-sealing state; a gas sensor (12) attached to a space (S) to be inspected in the cover body (30); an air curtain (40) which partitions and forms a communication area for communicating an external environment area (T) of the cover main body (30) with a space (S) to be inspected of the cover main body (30); the influence of the ambient gas in the external ambient region (T) on the leak detection gas in the space (S) to be inspected is suppressed.
Description
Technical Field
The present invention relates to a pressure resistance inspection apparatus for a valve, and more particularly, to a pressure resistance inspection apparatus for a valve, which separates a space to be inspected for pressure resistance inspection from the outside to suppress an influence on the space to be inspected.
Background
Conventionally, as an apparatus for performing a pressure resistance test on a test object, for example, a leak detection apparatus of patent document 1 is disclosed. This apparatus is an apparatus for performing a pressure resistance test by a leak in a vehicle body, and is configured such that a sample sampling device is moved on a surface of the vehicle body in a state where a leak detection gas (search gas) is injected into the vehicle body, and a leak from a leak flow path generated in the vehicle body is detected by a gas sensor. In this case, since hydrogen gas and helium gas generally used as the leak detection gas have high diffusibility, air flowing out of the sample collector is blown onto the surface of the vehicle to form an annular air curtain (air current) therebetween, and the leak detection gas from the leak flow path is detected in the sample collection space provided inside the air curtain. By thus separating the sample collection space from the external air atmosphere by the air curtain, it is intended to make detection of a leak gas having a high diffusibility easy by setting the sample collection space small, and to accurately detect leakage of the leak gas in the sample collection space by preventing permeation of the external air into the inspection space.
The leak detector of patent document 2 is a device for pressure resistance inspection that detects leakage of signal gas from the body surface of a vehicle with a motor. In this device, a detection head for detecting a signal gas (helium gas) is scannably provided, and a plurality of orifices are formed in an outer peripheral portion of an annular opening portion constituting a curtain (air curtain) of a shielding gas, in addition to the annular opening portion. Thus, in order to prevent local air from being blown out, an air curtain is uniformly provided so that air having an equal mass flow rate flows in a circular shape through the orifice, and the air curtain constitutes an inspection space to prevent the influence of outside air.
On the other hand, the gas leak detection device of patent document 3 is used for detecting a gas leak from a pneumatic valve provided in a semiconductor manufacturing facility and performing a pressure resistance test, and has a structure in which a trap portion formed of a cylindrical housing is used to prevent the gas from leaking to the outside. The trap portion is attached so that the valve is fitted from the opening portion at the lower end to cover the valve from above, and the cover member is attached to the opening portion. The cover member is formed in a substantially semicircular shape, and a groove capable of coming into contact with the outer peripheral surface of the valve is formed on the inner peripheral side of the cover member. An adhesive is applied to the groove and an outer edge portion of the cover member, and the groove is joined to the valve outer peripheral surface and the outer edge portion is joined to the opening portion of the trap portion, respectively, thereby closing the opening portion with the cover member. Thus, gas leakage to the outside is prevented, and gas leaking from the valve is detected in a trap part having a predetermined volume, thereby searching for damage to the valve.
Documents of the prior art
Patent document
Patent document 1: japanese Kohyo publication Sho 58-500672
Patent document 2: japanese laid-open patent publication No. 60-73329
Patent document 3: japanese patent laid-open No. 2016-536623.
Disclosure of Invention
Problems to be solved by the invention
In these devices, since the detection unit is a device that moves on the surface of the vehicle body to detect a leak, it is not possible to perform a pressure resistance test on a part or all of the vehicle at a time, and a large amount of time is required to test the entire vehicle.
On the other hand, the gas leak detection device of patent document 3 is a device that is fixedly attached to each valve connected to a flow path of a semiconductor manufacturing apparatus and detects a leak generated from each valve in a fixed state. Therefore, it is difficult to continuously perform the pressure resistance test of different test valves using this test apparatus. This device detects gas leakage from the entire valve incorporated in the trap portion, and cannot detect leakage from a part of the valve.
The present invention has been made to solve the conventional problems, and an object of the present invention is to provide a pressure resistance inspection apparatus for a valve, which can set a leak inspection space to be small so that detection of leak detection gas is easy, and which can accurately inspect leakage from a part or all of test valves in a short time at a time by preventing external gas from penetrating into the space, thereby continuously performing pressure resistance inspection on different test valves.
Means for solving the problems
In order to achieve the above object, the invention according to claim 1 is a pressure resistance inspection device for a valve, comprising: a cover main body which surrounds a part or the whole of the test valve in a non-sealing state; a gas sensor attached to the inspected space in the cover main body; and an air curtain which divides and forms a communication area for communicating the external environment area of the cover main body with the inspected space of the cover main body; the structure is configured to suppress the influence of the ambient gas in the external ambient region on the leak detection gas in the space to be inspected.
The invention according to claim 2 is a pressure resistance inspection device for a valve, in which an air curtain coming out from an opening edge of an opening portion provided at a lower portion of a cover main body blocks an outside from a space to be inspected.
The invention according to claim 3 is a pressure resistance inspection device for a valve, configured so as not to be affected by ambient gas in an external ambient area in a state where an air curtain blows air from an opening edge toward an inside to close an opening.
The invention according to claim 4 is a pressure resistance inspection device for a valve, which is provided with an air purge flow path for purging air in an inspection space of a cover main body.
The invention according to claim 5 is a pressure resistance inspection apparatus for a valve, configured to perform a pressure resistance inspection by surrounding a pressure resistance inspection site of a valve under test with a cover main body.
Effects of the invention
According to the invention of claim 1, the inspection space can be made small by surrounding a part or the whole of the test valve with the cover main body, so that the detection of the leak gas can be facilitated, and the communication space for communicating the external environment region of the cover main body with the inspection space can be formed by the air curtain partition, so that the portion to be inspected of the test valve can be partitioned from the outside, and the infiltration of the external environment region with the ambient gas can be prevented to suppress the influence thereof. Thus, the leak detection gas from the test valve is diffused into the space to be inspected partitioned by the air curtain and then accumulated, and the leak from the test valve is detected by the gas sensor at a time, thereby performing the pressure resistance inspection in a short time with high accuracy. Further, leakage of the leak detection gas from the space to be inspected to the external environment region is prevented, and there is no possibility of adverse effects on external devices and the like. The pressure resistance test can be continuously performed on part or all of different test valves because of the structure in which the cover body is moved to surround part or all of the test valves in a non-sealed state and then the air curtain can block the ambient air in the external ambient area.
According to the invention of claim 2, even when a pressure resistance test is performed on a protruding portion such as a stem shaft seal portion of a test valve, the outside and a space to be inspected can be reliably blocked by an air curtain coming out from an opening edge of the opening portion, and leakage of an ambient gas in an external ambient area into the space to be inspected can be reliably prevented, thereby enabling a leak gas to be detected with high accuracy.
According to the invention of claim 3, the air blown out from the opening edge of the cover main body toward the inside collides with each other to surround and close the opening, thereby blocking the ambient air in the external ambient area by the air curtain to prevent the ambient air from penetrating into the cover main body, and reliably detecting the leakage from the entire test valve into the cover main body. Thus, even when the types, grades, and sizes of the test valves are different, the test valves can be housed in the cover body, and the high-precision pressure resistance test can be performed while suppressing the influence of the external ambient gas.
According to the invention of claim 4, by providing the air purge flow path for purging air from the space to be inspected, the leak detection gas in the space to be inspected can be quickly discharged through the air purge flow path, and the pressure resistance test can be performed on the next valve to be tested in a short time after the pressure resistance test. Furthermore, if the air curtain prevents the penetration of the external ambient gas into the space to be inspected, the leak detection gas can be discharged more quickly.
According to the invention of claim 5, the pressure resistance inspection can be partially performed on the pressure resistance inspection site of the test valve, and the pressure resistance inspection can be performed on a part of the test valve during assembly. Further, by surrounding the test valve with a predetermined size of the space to be inspected, the time required for the pressure resistance inspection can be made substantially constant, and the automation of the pressure resistance inspection can be realized. Furthermore, if the volume of the space to be inspected is made small, the inspection time can be shortened.
Drawings
Fig. 1 is a schematic cross-sectional view showing an embodiment of a pressure resistance testing device for a valve according to the present invention.
Fig. 2 is an enlarged cross-sectional view showing a pressure resistance test state of the test valve.
Fig. 3 is a perspective view of the cover main body.
Fig. 4 is a longitudinal central sectional view of the cover main body.
Fig. 5 is a sectional view a-a of fig. 4.
Fig. 6 is a bottom view of the cover main body.
FIG. 7 is a front view showing another embodiment of the pressure resistance test apparatus of the present invention.
Detailed Description
Hereinafter, the pressure resistance test device of the valve according to the present invention will be described in detail based on the embodiments.
Fig. 1 shows an embodiment of a pressure resistance test apparatus (hereinafter referred to as an apparatus main body 1) of the present invention, fig. 2 shows an enlarged cross-sectional view of the pressure resistance test apparatus, and fig. 3 shows a cover main body.
The apparatus main body 1 shown in fig. 1 is provided to be able to supply a leak detection gas to a test valve 2 as an object to be tested and to perform a pressure resistance test on the test valve 2, and includes a housing 10, a chamber 11, a gas sensor 12, a support jig 13, and a clamp jig 14.
The frame body 10 is formed in a frame shape in which the test valve 2 can be attached to the inside thereof, and an inspection space R for performing a pressure resistance inspection of the test valve 2 is provided inside thereof. An opening portion 20 is provided in a part of the housing 10, and the test valve 2 can be attached and detached from the right side or the near side of the housing 10 in fig. 1 through the opening portion 20. In the figure, two exhaust fans 21 indicated by a dashed-dotted line are attached to the rear side of the housing 10 via a plate member or the like not shown, and the exhaust in the inspection space R can be performed by the rotation of the exhaust fans 21. The chamber 11, the support jig 13, and the clamp jig 14 are mounted inside the housing 10.
The chamber 11 is provided for performing a pressure resistance test of the test valve 2, and includes a cover main body 30 and a suspension portion 31. In fig. 2 to 6, the cover main body 30 is formed in a substantially rectangular shape, and an opening 32 is provided in a lower portion thereof. Thus, the cover main body 30 is provided in a semi-open type with an open lower portion, and is provided so that the inside thereof can surround a part or the whole of the test valve 2. In this example, a stem shaft sealing portion 33 as a part of the test valve 2 is set as an inspection target portion (pressure resistance inspection portion), and an inspection target space S having a size capable of performing a pressure resistance inspection by surrounding the pressure resistance inspection portion 33 is provided inside the cover main body 30. As shown in fig. 1, a hanging portion 31 in the chamber 11 is attached to an upper portion of the cover main body 30, and the chamber 11 is provided so as to be movable forward and backward and upward and downward in the inspection space R via the hanging portion 31.
In the present embodiment, the cover main body 30 has a compact structure of 50mm in height, 70mm in length, and 40mm in depth.
In fig. 2, the space S to be inspected of the cover main body 30 is a space into which a leak gas supplied to the test valve 2 can diffuse, and is isolated from the outside. The "state of being isolated from the outside" in the present embodiment means that the inside of the cover main body 30 is not in a sealed state but in a so-called non-sealed state. That is, when the pressure resistance test portion 33 of the test valve 2 is surrounded in an unsealed state by the cover main body 30, the leak gas leaking from the test valve 2 in the cover main body 30 can be prevented from reaching the test valve 2 in the test space S and can be allowed to flow to such an extent that the leak gas reaches the gas sensor 12 during the test.
The cover main body 30 is provided with a gas sensor 12 and an air purge (air purge) flow path 34.
The gas sensors 12 are attached to sensor mounting holes 35 formed in 3 positions on the inner surface of the cover main body 30 and 1 position on the inner surface of the cover main body 30 in this example, in predetermined plural positions where leak gas easily stays in the space S to be inspected in the cover main body 30, respectively, and leakage of leak gas supplied into the test valve 2 from the pressure-resistant inspection portion 33 can be reliably detected in the space S to be inspected by the 4-position gas sensors 12. The number of the gas sensors 12 can be arbitrarily set, and if the number is increased, the detection capability can be improved, and the detection time can be shortened and automated.
The gas sensor 12 of the present embodiment is constituted by a hydrogen sensor, and a hydrogen gas (leak detection gas) to be described later supplied into the test valve 2 can be detected by the hydrogen sensor. By using the hydrogen sensor, it is possible to reliably detect leakage of hydrogen in a mixed gas of hydrogen and nitrogen, which is a diffusible gas. The gas sensor 12 may be movably attached so that the position thereof can be adjusted with respect to the cover main body 30. Helium may be used as the leak detection gas, and in this case, a gas heat conduction type sensor may be used as the gas sensor.
The gas sensor 12 is configured by a module that outputs a voltage corresponding to the concentration of the leaked hydrogen by applying a predetermined voltage. Before the examination, it is necessary to change the output voltage by a potentiometer (volume) for resistance adjustment, and to finely adjust the sensitivity in accordance with the warm-up state of the gas sensor 12 and the change in the hydrogen concentration in the atmosphere.
As the gas sensor 12, one capable of outputting an analog signal (0-5V) is usedA commercially available semiconductor type sensor uses, for example, a hot-wire type semiconductor type hydrogen sensor. The gas sensor 12 uses tin dioxide (SnO)2) And the like, due to adsorption of hydrogen gas on the surface of the metal oxide semiconductor. In this case, the output voltage becomes logarithmic with respect to the gas concentration, and a high-sensitivity output can be performed even at a low concentration.
The air purge flow path 34 is provided to communicate with the outside from the space S to be inspected of the mask body 30, and a purge air supply pipe 36 is connected to the air purge flow path 34. When purge air is supplied from the purge air supply pipe 36 by a compressor, not shown, the air is supplied into the space S through the air purge flow path 34, and the space S is purged with air. The air purge flow path 34 may be provided in an air flow path other than the air flow path 41 for the air curtain 40 described later, or may be provided in a flow path switchable with the air flow path 41 for the air curtain.
In fig. 3, 4, and 6, an air flow path 41 indicated by a broken line constituting an air curtain 40 is formed in a hollow shape outside the space S to be inspected of the cover main body 30 so as not to communicate with the space S to be inspected, and the air flow path 41 includes an air supply port 42 and a branch flow path 43. The air supply port 42 is formed on the upper surface side of the cover main body 30, and a branch flow path 43 is formed so as to branch from the air supply port 42 to the left and right in fig. 5. The branch flow paths 43 are formed in a thin slit shape (planar shape) along the side surfaces of the cover main body 30, and opening edges 45 as air ejection ports formed at the lower portion thereof are formed on the left and right sides so as to extend along the opening portion 32. With this, the air curtains are formed by the air ejected from the respective opening edges 45 opposing or intersecting each other.
The left and right opening edges 45 in fig. 5 are provided so as to be inclined inward (inward) at a predetermined angle θ with respect to the vertical direction of the cover main body 30. When air is supplied from the air supply port 42, the air flows into each branch flow path 43 at the branch position, passes through the slit-shaped branch flow path 43, and is blown out from the opening edge 45. When the air flows inward from the opening edge 45, the air from the left and right interfere with each other to surround the space S to be inspected, and an air curtain 40 indicated by a one-dot chain line is formed on the outer peripheral side of the opening 32.
Here, a preferred angle θ of the opening edge 45 when the pressure of the air supplied to the speed controller (throttle valve: not shown) located at the front stage of the air supply port 42 is about 0.6MPa will be described in detail. The air pressure of 0.6MPa is a pressure generally used for air-driven applications.
The flow rate of the air supplied to the speed controller is adjusted to about 100mL/min to about 300mL/min by the speed controller.
In the above flow rate of air, when the angle θ of the opening edge 45 from the vertical direction is set to about 50 ° or more, the volume of the substantially triangular region in side view surrounded by the air curtain 40 and the bottom surface side of the cover main body 30 is made small, and the air blown out from the opening edge 45 strongly collides with each other, so that the outflow of the leak detection gas leaking from the test valve 2 into the space S to be inspected to the outside can be suppressed.
On the other hand, when the angle θ is set to about 75 ° or less, the air blown from the opening edge 45 collides with each other and flows downward, whereby the air can be prevented from diffusing and rising in the direction of the space S to be inspected, and the air can be prevented from flowing into the space S to be inspected.
As described above, it was confirmed that: by setting the angle θ to be equal to or larger than a predetermined value (approximately 50 ° or larger), leakage can be prevented while maintaining the retention of the leak detection gas in the space S to be inspected; on the other hand, by setting the angle θ to a predetermined magnitude or less (about 75 ° or less), infiltration of the external atmosphere into the space S to be inspected can be reliably prevented. Because of this, in this example, the opening edge 45 is formed in a range of an angle θ of 50 ° or more and 75 ° or less, thereby avoiding adverse effects on the space to be inspected by air and further improving the accuracy of the pressure resistance inspection.
In the present example, the angle θ is set within the above range according to the above conditions, but the angle θ is preferably set to an optimum value according to various conditions such as the size and shape of the cover main body 30 and the form of the test valve.
The pressure of the air may be such that the opening 32 of the cover main body 30 is closed to block the outside from the space S to be inspected, and it is further preferable that the pressure of the air be such that the ambient air in the external ambient area T can be separated from the space S to be inspected by maintaining the flow downward of the cover main body 30.
The width of the opening edge 45 may be set to an appropriate size, and the air volume can be changed by changing the size of the width.
The apparatus main body 1 includes the air curtain 40, and partitions a communication region near the opening 32 that communicates the external environment region T of the cover main body 30 with the space S to be inspected of the cover main body 30, thereby blocking the outside (external air) from the space S to be inspected. Therefore, in the space S to be inspected of the cover main body 30, the influence of the ambient gas in the external ambient region T on the leak gas can be suppressed.
In fig. 1 and 2, the support jig 13 is provided in the housing 10 at a predetermined interval in the vicinity of both sides on which the test valve 2 can be placed, and can support the test valve 2 from below. The mounting surface 46 is provided on the upper surface side of the supporting jig 13, and the mounting surface 46 is provided in an appropriate shape such as a tapered shape capable of holding a test valve side portion having a polygonal shape such as a hexagonal shape or an octagonal shape, or a circular arc shape capable of holding a test valve side portion having a cylindrical shape.
The clamp jig 14 includes a fixed clamp jig 50 and a movable clamp jig 51.
The fixing jig 50 is disposed at a position to be the primary side of the test valve 2 via a fixing holder 52, and a primary-side flow path 53 for supplying a leak gas into the test valve 2 is formed near the center of the fixing jig 50. A seal member 54 formed of an annular gasket is attached to a surface of the fixing jig 50 facing the primary side of the test valve 2, and leakage from a pressure contact portion that is in pressure contact with the test valve 2 is prevented by the seal member 54 when the test valve 2 is fixed.
The movable clamp 51 is disposed on the secondary side of the test valve 2, and is attached to be movable in the tightening direction so as to be able to hold the test valve 2 by the movable clamp 51 and the fixed clamp 50.
The advancing and retreating direction of the cover main body 30 and the advancing and retreating direction of the movable clamp 51 as a clamp of the test valve 2 are arranged in the same direction. A secondary flow path 55 serving as a purge flow path is provided inside the movable clamp member 51, and after the pressure resistance test of the test valve 2, the leak detection gas in the test valve is purged by air pressure through the secondary flow path 55.
A sealing member 54 formed of an annular gasket is attached to the surface of the movable clamp 51 facing the secondary side of the test valve 2, similarly to the fixed clamp 50. The seal member 54 prevents leakage from the pressure contact portion with the movable clamp 51 when the test valve 2 is fixed.
The test valve 2 was constituted by a ball valve, and the apparatus main body 1 was subjected to pressure resistance inspection in a state in which a part of the constituent parts of the ball valve 2 was assembled. The test valve 2 includes a valve body 60 as a casting component, a valve rod 62 for rotary operation is inserted into a cylindrical shaft portion 61 formed in the valve body 60, a packing pressing portion 63 is screwed from above, and the valve rod 62 is rotatably provided in a positioned state. O-rings 65 are attached to 2 positions on the outer periphery of the valve stem 62, a pressure resistance test portion 33 as a stem shaft seal portion is provided via these O-rings 65, and the pressure resistance test portion 33 is surrounded by the cover body 30 to detect leakage, thereby performing a pressure resistance test.
As the leak detection gas for the pressure resistance test of the test valve 2, for example, a gas containing hydrogen is used, and as the gas having diffusivity, a hydrogen gas containing a mixed gas of 5% hydrogen and 95% nitrogen as an inert gas is used. This mixed gas has a property of leaking from the vicinity of the threaded portion of the packing pressing portion 63 of the stem shaft seal portion 33 of the valve body 60 when external leakage occurs in the pressure resistance test.
A mixed gas of 5% hydrogen and 95% nitrogen as a leak detection gas is a high-pressure gas which is incombustible, and therefore can be safely used. The leak detection gas may be a gas other than a hydrogen-containing gas, and various gases such as helium gas and methane gas may be used. When hydrogen is used as the leak detection gas, it is less expensive than the above-described gas. On the other hand, when helium gas is used, the diffusivity becomes high as in the case of a mixed gas containing hydrogen.
In the above embodiment, the apparatus main body 1 is used for the preliminary pressure resistance inspection before the final pressure resistance inspection, but is not limited to the use for the preliminary pressure resistance inspection.
In this example, since a small-diameter screw-type ball valve is used as the test valve 2, the cover main body 30 has a shape capable of surrounding the stem shaft seal portion 33 of the test valve 2, and the branch flow paths 43 of the air flow path 42 are provided only on both sides in the longitudinal direction of the cover main body 30, but a cover main body 30 having another form may be provided. For example, slit-shaped branch flow paths may be provided on both sides in the width direction in addition to the longitudinal direction of the cover main body 30, and air may be ejected from the opening edges of the branch flow paths in the width direction (not shown). In this case, when the air is ejected from the opening edges, the air curtains are formed so as to surround the openings 32 while facing each other or intersecting each other in the longitudinal direction and the width direction. Further, instead of the longitudinal direction of the cover main body 30, only both sides in the width direction may be provided with slit-shaped branch flow paths so that air is ejected from the opening edges of the branch flow paths in the width direction (not shown).
For example, when a large-diameter ball valve is used as the test valve, the cover body may be formed in a rectangular shape, a cylindrical shape, or the like that can surround the stem shaft seal portion of the ball valve, and an opening edge may be provided over the entire periphery of the opening of the cover body (not shown). In this case, the air curtain is formed by the air blown from the opening edge so as to surround the space to be inspected from the entire periphery side, and the shielding property of the space to be inspected from the external environment area can be further improved. Therefore, even if the test valve is large, the accuracy of the pressure resistance test can be maintained.
The inspection target site of the cover body is not limited to the stem shaft seal site of the test valve, and may be provided in various sites of the test valve. This makes it possible to detect leakage from the entire test valve, using the entire test valve as the site to be inspected. Further, the test valve is not limited to a ball valve, and various valves such as a shutoff valve and a gate valve can be used, and a pressure resistance test can be performed using a part or the whole of the valves as a test target portion.
In this case, the cover body is not limited to a rectangular shape, and the external shape, size, and volume of the inspection space S can be arbitrarily set according to the size and shape of the inspection target portion, and the pressure resistance inspection can be performed by surrounding the inspection target portion of the test valve in the inspection space S. The inspection target site (object to be inspected) may be other than the valve (valve) to be inspected, and examples of the inspection target site include various devices such as actuators, pressure vessels, and pumps, and components for transporting fluids such as pipes, and the pressure resistance inspection may be performed on the shaft seal portion of these devices and components or a site where leakage is likely to occur (a site requiring pressure inspection) in the space S to be inspected having a required volume.
The opening edge 45 of the opening 32 is not necessarily formed to be inclined with respect to the vertical direction of the cover main body 30, and may be provided in the vertical direction from the opening 32 (not shown). In this case, since the air flows from the opening edge of the branch flow path 43 directly downward and the air curtain can be configured to surround the space S to be inspected with the air, the outside (outside air) can be blocked similarly to the case where the inclined opening edge 45 is provided.
Next, the procedure and operation of the pressure resistance test performed by the apparatus main body 1 of the above embodiment will be described. It is assumed that the pressure resistance test of the valve of this example is performed in accordance with each air pressure test of the pressure resistance test of the valve box specified in JIS B2003 (general rule for valve testing). In this case, the pressure resistance test is performed on the test valve 2 by dividing the pressure resistance preliminary test in which partial pressure resistance tests of the components of the test valve 2 are performed by the apparatus main body 1 described above and the pressure resistance final test. The pressure proof preliminary inspection is performed after the pressure proof preliminary inspection, and is performed to inspect the integrity of the entire test valve 2 and the respective seal portions.
In the case of performing a pressure resistance preliminary inspection, the valve body 60, the valve stem 62, the O-ring 65, and the packing pressing portion 63 are integrally assembled so that the valve 2 under test is in a semi-finished state. While the primary side of the test valve 2 is brought into contact with the seal member 54 of the fixed clamp 50, the test valve 2 is placed on the support jig 13, and in this state, the movable clamp 51 is moved in the holding direction from the secondary side of the test valve 2 and clamped. At this time, the sealing members 54 and 54 are sealed at the primary and secondary side end portions of the test valve 2, respectively, and the primary side flow path 53 of the fixed clamp 50 and the secondary side flow path 55 of the movable clamp 51 are in a state of communication in a state where leakage at the primary and secondary side openings of the test valve 2 is prevented.
In this case, as shown in fig. 1, the chamber 11 is at a position retreated from the clamping position of the test valve 2, and by supplying purge air from the purge air supply pipe 36 into the space S to be inspected through the air purge flow path 34 at the retreated position, the space S to be inspected is air-purged by the flow of air indicated by the two-dot chain line as shown in fig. 4. In this case, the air curtain 40 may be provided by supplying weak air from the air supply port 42.
By moving the chamber 11 forward and downward, the stem shaft seal portion 33 of the test valve 2 is covered with the cover main body 30, and as shown in fig. 2, the stem shaft seal portion 33 as a pressure resistance test portion is surrounded in an unsealed state in the test space S.
Next, a leak detection gas (hydrogen gas) is supplied from the primary flow path 53 into the test valve 2, pressurized while being sealed in the valve body 60, and supplied with air from the air supply port 42. The air flows into the branch flow paths 43 from the air supply port 42, passes through the branch flow paths 43, and is blown out from the opening edge 45. By this air interfering in an impinging manner by means of the opening edge 45 being inclined toward the inside, the air curtain 40 is provided along the opening edge 45. By forming a communication region for communicating the external environment region T of the cover main body 30 with the space S to be inspected by partitioning with the air curtain 40, the outside is shielded from the space S to be inspected. Therefore, the influence of the ambient gas in the external ambient region T on the leak detection gas leaking from the test valve 2 is suppressed, and in this state, the presence or absence of leakage of the hydrogen gas in the test space S, the amount of leakage, and the like can be detected with high accuracy, and the pressure resistance test can be performed accurately.
At this time, since the air supply port 42 is provided at a substantially central position of the left and right branch flow paths 43, the air supplied from the air supply port 42 flows substantially equally to the left and right branch flow paths 43, and the air having entered the slit-shaped branch flow paths 43 is uniformly blown out from the opening edge 45. Thus, the air curtain 40 having a substantially uniform air volume over the entire area is disposed below the space S to be inspected.
As described above, the volume of the space S to be inspected is reduced by surrounding the stem shaft seal portion 33 of the test valve 2 with the cover main body 30 in an unsealed state, and the leak gas leaking from the stem shaft seal portion 33 diffuses into the space S to be inspected and stays therein, so that the gas sensor 12 can detect even a small leak of the leak gas. Further, by disposing the gas detection site of the gas sensor 12 close to the test valve 2, more accurate detection is possible.
At this time, since the communicating region that communicates the external environment region T of the cover main body 30 with the space S to be inspected is partitioned by the air curtain 40, the opening 32 of the cover main body 30 is surrounded so as to be closed by the air curtain 40, and the environmental gas of the external environment region T such as residual gas and exhaust gas after the pressure resistance inspection is prevented from penetrating into the space S to be inspected from the opening 32. Further, leakage of the leak detection gas remaining in the inspection area S to the outside can be prevented by the air curtain 40.
With this, leak gas leaking from the pressure-resistant test portion 33 of the test valve 2 into the test space S can be detected accurately in a short time, and accurate pressure-resistant test can be performed. At this time, by providing the air curtain 40 by supplying weak air from the air supply port 42, the diffusion of the leak detection gas can be suppressed and leakage to the outside can be prevented even in the space S to be inspected by the weak air curtain 40, and the influence on the inspection accuracy can be suppressed to the minimum.
After the pressure resistance test is performed, purge air is supplied from the air purge flow path 34, whereby the leak detection gas in the test space S is discharged from the opening 32 to the test space R. In this case, if the air purge passage 34 is provided by another passage other than the air passage 41 for the air curtain 40, the space S to be inspected can be purged while being surrounded by the air curtain 40, and the leak detection gas can be discharged more quickly. The leak detection gas discharged into the inspection space R is discharged to the outside by the exhaust fan 21, thereby preventing the leak detection gas from remaining in the inspection space S and the inspection space R.
After the leak gas is discharged, the cover main body 30 is raised and retreated from the inspection target portion 33 of the test valve 2, and the movable clamp 51 is moved in a direction away from the test valve 2 and loosened, thereby detaching the test valve 2 from the apparatus main body 1.
Next, when the pressure resistance preliminary inspection of the different test valves 2 is performed, the same procedure as the above-described inspection may be performed.
When pressure resistance preliminary inspection is continuously performed on different test valves 2, air may be continuously supplied from the air supply port so that the air curtain 40 is always generated. In this case, after the test of the test valve 2 is completed, the air curtain 40 diffuses the leak detection gas that may remain in the housing 10, which is the external environment region T, and can promote the discharge of the leak detection gas to the outside by the exhaust fan 21, thereby more reliably preventing the leak detection gas from remaining in the test space R.
As described above, if the space S to be inspected is purged with air in addition to the pressure resistance inspection, the residual gas after the pressure resistance inspection is reliably removed, and the pressure resistance inspection of the next valve 2 to be tested can be accurately performed.
Further, if a small amount of air is always supplied from the air supply port 42, the exterior (the external environment area T) is blocked from the space S to be inspected by the weak air curtain 40, and the infiltration of the exhaust gas of equipment such as a forklift (fork lift) disposed at the inspection site, the residual gas of the test valve 2 to be inspected immediately before, and the like from the opening portion 32 can be always prevented, so that erroneous determination at the time of the pressure resistance inspection can be prevented and an accurate detection result can be obtained.
After the pressure resistance preliminary inspection, all the components such as the valve disk, the ball seat, and the bonnet, which are not shown, are incorporated into the test valve 2 in the partially assembled state. Further, a test valve in a completely assembled state was provided by fixing a handle to the upper portion of the valve stem 62 via a gasket and a nut, not shown, and then a pressure proof main test was performed on the test valve.
In the pressure proof test, the test valve clamp is held in a large test space in a large test apparatus, not shown, and the test is performed in a state where the entire test apparatus is covered. In this case, the test valve is set to a half-open state, and the leak detection gas is sealed, and the presence or absence of leakage of the leak detection gas is detected by a gas sensor.
The test valve that is acceptable for the pressure resistance test of both the pressure resistance preliminary test and the pressure resistance final test is an acceptable product. When the pressure resistance is determined to be defective in the pressure resistance main inspection, it is only necessary to confirm the portions other than the sealing portions that are not defective in the pressure resistance preliminary inspection, and therefore, the determination of the cause portion can be speeded up. After the pressure resistance test, the test valve was removed by purging the inside of the test valve to discharge the residual gas, and then the clamping jig was released.
As described above, if the pressure pre-inspection is performed before the pressure main inspection, it is possible to detect defects and processing defects of the respective test valves at an early stage without assembling the entire test valves.
Fig. 7 shows another embodiment of the pressure resistance test apparatus according to the present invention. In this embodiment, the same portions as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.
The apparatus main body 70 of this embodiment can perform a pressure resistance test on all (the entire) of the test valve 71, and can also be used for a pressure resistance final test after the pressure resistance preliminary test described above.
The apparatus main body 70 has a cylindrical cover main body 72, and the cover main body 72 is formed in a size capable of accommodating the whole (entire) of the test valve 71. A disk 74 is attached to an opening 72a in the lower portion of the cover main body 72, and a fixing clamp 75 for clamping the test valve 71 is attached to the center of the upper surface of the disk 74.
On the other hand, an annular plate 76 is attached to the opening portion 72b of the upper portion of the cover main body 72, and a movable clamp 77 can be attached to the upper surface of the annular plate 76.
The movable clamp 77 includes an attachment plate 80, an operating lever 81, and a movable clamp plate 82, and is provided so as to be fixed to the annular plate 76 via the attachment plate 80. The mounting plate 80 has a plurality of communication holes, not shown, through which the operating rods 81 are inserted. A movable clamp plate 82 for clamping the test valve 71 is attached to the distal end side of the operating lever 81, and the movable clamp plate 82 is provided so as to be capable of moving up and down by the operating lever 81.
The disk 74 and the annular plate 76 of the cover body 72 are formed to have a larger diameter than the cover body 72, and the disk 74 is provided with a plurality of air supply ports 84 that communicate with each other at predetermined intervals and can blow out air supplied from the outside downward. On the other hand, a plurality of gas sensors 85 are attached to predetermined positions on the outer periphery of the cover main body 72 so as to communicate with the space to be inspected S1 provided in the cover main body 72, and leakage of the leak detection gas supplied into the test valve 71 is detected by these gas sensors 85.
In the case of performing the pressure resistance test of the test valve 71, the lower flange surface of the assembled test valve 71 is placed on the fixed clamp 75 and is accommodated in the cover body 72, the mounting plate 80 is placed on the upper surface of the annular plate 76, and the movable clamp 77 is attached to the cover body 72.
Next, the movable clamp plate 82 is lowered by the operating rod 81, and the flange surface on the upper side of the test valve 71 is pressed by the movable clamp plate 82, whereby the test valve 71 is disposed at a predetermined position in the cover main body 72. At this time, by providing a gap between the communication hole of the mounting plate 80 and the operation rod 81, the entire (entire) test valve 71 is surrounded in an unsealed state in the cover main body 72.
The leak detection gas is supplied into the test valve 71 with the test valve 71 clamped by the fixed clamp 75 and the movable clamp 77, and air is supplied from the air supply ports 84. At this time, air is blown out from the discharge side of the air supply port 84 in the direction indicated by the two-dot chain line arrow, and by the air colliding with the vicinity of the outer peripheral edge of the circular plate 74, an air curtain 90 indicated by the one-dot chain line can be formed in an annular shape between the upper annular plate 76 and the lower circular plate 74, and the outer periphery of the cover main body 72 can be surrounded by the air curtain 90. This prevents the space S1 to be inspected in the cover main body 72 from being affected by the ambient gas in the external ambient region T1 outside the cover main body 72.
In the apparatus main body 70, the air curtain 90 reliably prevents the exhaust gas and the like generated in the external environment region T1 from penetrating into the space to be inspected S1 from the gap of the movable clamp 77, thereby preventing erroneous determination at the time of inspection. Therefore, the space S to be inspected can be sealed without eliminating the gap on the movable clamp 77 side, and the influence on the leak gas can be suppressed. Therefore, the movable clamp 77 and the fixed clamp 75 are not complicated in structure, and therefore, the pressure resistance test of a part or the whole of the test valve 71 can be performed while suppressing the cost.
In the illustrated arrow, the air is blown out linearly from the air supply port 84, but the arrow indicates the blowing direction of the air, and the air can be actually blown out so as to spread radially as it advances in the blowing direction from the air supply port 84. In this case, the air blown out from the adjacent air supply ports 84 collide with each other, whereby a circumferential air curtain 90 can be formed between the circular plate 74 and the annular plate 76 (mounting plate 80). This can improve the shielding property from the external environment region T1 in the space S1 to be inspected, and can more reliably prevent leakage of the leak detection gas from the space S1 to the external environment region T1, while minimizing the influence of the external environment region T1.
Although not shown, the air purge flow path may be provided in the apparatus main body 70 as in the above-described embodiment. In this case, by supplying purge air to the space S1 through the air purge flow path, the inside of the space S1 can be efficiently purged with air.
Although not shown, the air supply port 84 may be provided on the outer peripheral side of the annular plate 76 or the attachment plate 80. In this case, since the distance from the space S1 to the external environment region T1 is long, the influence of the external environment region T1 can be minimized.
While the embodiments of the present invention have been described above in detail, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention described in the claims of the present invention. For example, the present invention can be applied to various piping devices other than valves, and can also be used for pressure resistance tests of various pressure devices such as air pressure actuators. In the case of performing the pressure resistance test, the amount of leakage may be measured instead of the presence or absence of leakage of the leak detection gas.
Description of the reference numerals
1. 70 device body
2. 71 test valve
12. 85 gas sensor
30. 72 cover body
32 opening part
33 pressure test part (valve stem shaft seal part)
34 air purge flow path
40. 90 air curtain
45 opening edge
S, S1 space to be inspected
T, T1 outside the environment.
Claims (5)
1. A pressure resistance inspection device for a valve, comprising: a cover main body which surrounds a part or the whole of the test valve in a non-sealing state; a gas sensor attached to the inspected space in the cover main body; and an air curtain which divides and forms a communication area for communicating the external environment area of the cover body with the inspected space of the cover body; the leak detection device is configured to suppress an influence of an ambient gas in an external ambient area on a leak detection gas in the space to be inspected.
2. The apparatus for inspecting a pressure-proof property of a valve according to claim 1, wherein the air curtain coming out from an opening edge of an opening portion provided at a lower portion of the cover main body blocks an outside from the space to be inspected.
3. The apparatus for inspecting a pressure-resistant property of a valve according to claim 2, wherein the air curtain is configured not to be affected by an ambient gas in an external ambient area in a state where the opening is closed by blowing air from the opening edge toward an inner side.
4. The device for inspecting a pressure resistance of a valve according to any one of claims 1 to 3, wherein an air purge flow path for purging air from the space to be inspected of the cover main body is provided.
5. The apparatus for testing pressure resistance of a valve according to any one of claims 1 to 4, wherein the cover body is configured to surround a pressure resistance test portion of the valve to be tested to perform pressure resistance test.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019106832 | 2019-06-07 | ||
| JP2019-106832 | 2019-06-07 | ||
| PCT/JP2020/022344 WO2020246592A1 (en) | 2019-06-07 | 2020-06-05 | Pressure resistance inspection device for valve |
Publications (1)
| Publication Number | Publication Date |
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| CN114008432A true CN114008432A (en) | 2022-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202080041936.2A Pending CN114008432A (en) | 2019-06-07 | 2020-06-05 | Pressure resistance inspection device for valve |
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| JP (1) | JPWO2020246592A1 (en) |
| CN (1) | CN114008432A (en) |
| WO (1) | WO2020246592A1 (en) |
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| CN113155441B (en) * | 2021-04-06 | 2023-04-18 | 云南祥丰石化有限公司 | Durability detection system and method for air valve for chemical industry |
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| JPWO2020246592A1 (en) | 2020-12-10 |
| WO2020246592A1 (en) | 2020-12-10 |
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Country or region after: Japan Address after: Tokyo, Japan Applicant after: KITZ Corp. Address before: Chiba, Chiba, Japan Applicant before: KITZ Corp. Country or region before: Japan |