CN112304595B - Testing device capable of analyzing influence of O-shaped ring wire diameter on high-pressure sealing performance - Google Patents
Testing device capable of analyzing influence of O-shaped ring wire diameter on high-pressure sealing performance Download PDFInfo
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- CN112304595B CN112304595B CN202011183546.7A CN202011183546A CN112304595B CN 112304595 B CN112304595 B CN 112304595B CN 202011183546 A CN202011183546 A CN 202011183546A CN 112304595 B CN112304595 B CN 112304595B
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- 238000007789 sealing Methods 0.000 title claims abstract description 116
- 238000012360 testing method Methods 0.000 title claims abstract description 30
- 229920001971 elastomer Polymers 0.000 claims abstract description 29
- 210000004907 gland Anatomy 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims description 25
- 238000001514 detection method Methods 0.000 claims description 11
- 229910000906 Bronze Inorganic materials 0.000 claims description 10
- 229910052790 beryllium Inorganic materials 0.000 claims description 10
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 claims description 10
- 239000010974 bronze Substances 0.000 claims description 10
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims description 10
- 239000007769 metal material Substances 0.000 claims description 10
- 229920002379 silicone rubber Polymers 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- -1 polytetrafluoroethylene Polymers 0.000 claims description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 2
- 238000004458 analytical method Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 4
- 238000004033 diameter control Methods 0.000 abstract description 3
- 238000003556 assay Methods 0.000 abstract 1
- 239000001257 hydrogen Substances 0.000 description 25
- 229910052739 hydrogen Inorganic materials 0.000 description 25
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 24
- 239000007789 gas Substances 0.000 description 23
- 238000003860 storage Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 8
- 238000003825 pressing Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000004809 Teflon Substances 0.000 description 2
- 229920006362 Teflon® Polymers 0.000 description 2
- 238000010835 comparative analysis Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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- 238000000926 separation method Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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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
- G01M13/00—Testing of machine parts
- G01M13/005—Sealing rings
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Gasket Seals (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The utility model provides a but assay O type circle line footpath is to testing arrangement of high-pressure sealing performance influence, includes the cylinder body, the lateral wall intercommunication of cylinder body has intake pipe and outlet duct, accepts the lid, compresses tightly the pad, central conical cover, big conical cover pass through screw gland and install in the cylinder body top, and the outer wall that encircles central conical cover is opened has a plurality of strip ring seal groove one that are provided with little line footpath O type circle that are located the co-altitude, and the outer wall that encircles big conical cover is opened has a plurality of ring seal groove two that are provided with big line footpath O type circle that are located the co-altitude. According to the invention, the line diameter control of the small-line-diameter rubber O-shaped ring and the large-line-diameter rubber O-shaped ring is respectively realized by utilizing the matching of the protrusion on the side surface of the central conical cover and the large conical cover as well as the matching of the large conical cover and the cylinder body. And through the alternate use of the outer triangular cushion and the inner triangular cushion and the combined sealing structure of the cylinder cover sealing triangular cushion and the annular cushion, the uniqueness of a leakage channel in the test process of O-shaped rings with small wire diameters and large wire diameters is ensured, and the analysis of the relationship between the leakage rate and the O-shaped ring wire diameter under different sealing medium pressures is realized.
Description
Technical Field
The invention belongs to the technical field of high-pressure gas sealing, and particularly relates to a testing device capable of analyzing the influence of the wire diameter of an O-shaped ring on the high-pressure sealing performance.
Background
The hydrogen energy system is a large and complex energy system, wherein the hydrogen preparation technology is a source, the hydrogen storage and transportation technology is a key technology, and the efficient utilization of hydrogen is a core. In particular, the density of hydrogen in the standard state is very low, and is only 0.0899kg/m3Therefore, how to economically, safely and efficiently store and transport hydrogen is the key to the practical and industrial utilization of hydrogen energy. The current common hydrogen storage mode is mainly high-pressure hydrogen storage. Density of gaseous hydrogen as a function of pressureHigh pressure gaseous hydrogen storage is used to increase the density of hydrogen storage by increasing the storage pressure. Compared with other hydrogen storage modes, the high-pressure hydrogen storage mode has the advantages of high charging and discharging speed, simple structure of hydrogen storage equipment, low energy consumption for preparing compressed hydrogen and the like, and becomes the hydrogen energy transportation and filling mode which is most easy to realize industrialization and is the absolute dominant position at the present stage.
The sealing member is an indispensable important component of the high-pressure hydrogen storage vessel. The quality of the sealing effect will directly affect whether the high pressure hydrogen storage vessel can maintain the required internal pressure and the possibility of hydrogen leakage. The most common sealing part for the high-pressure hydrogen storage container is a rubber O-shaped ring, and the basic working principle of the sealing part is that the elastic deformation of the rubber O-shaped ring generates contact stress on a sealing contact surface, so that the sealing contact surface is tightly attached to a sealing surface and is squeezed into all microscopic recesses of the sealing surface to form a closed blocking sealing strip; the contact stress on the sealing surfaces is greater than the pressure of the sealing medium and leakage cannot form, whereas the sealing medium can enter the gap between the sealing element and the sealing surfaces and cause leakage due to surface separation. The elasticity of the rubber O-shaped ring can be improved by different molding processes of different materials or the same material, in addition, the size of the wire diameter of the O-shaped ring needs to be concerned, and the wire diameter is too large, so that leakage points are easy to increase; the wire diameter is too small, which makes the machining of the sealing groove difficult. Particularly, under the high-pressure hydrogen environment, the rubber O-shaped ring can absorb hydrogen to expand and bubble, so the influence of the wire diameter on the sealing performance is more severe than that of the normal working condition. The influence of the line diameter of the rubber O-shaped ring on the high-pressure sealing performance needs to be analyzed, the relation between the leakage rate and the line diameter under different sealing medium pressures is compared, and the optimization of the sealing ring parameters and the improvement of the sealing performance are realized on the basis of the relation. The existing testing device can realize different rubber O-shaped ring wire diameters, but cannot control the specific wire diameter, so that the analysis of the leakage rate along with the change of the wire diameter is difficult to carry out, and the difficulty is increased for selecting the wire diameter of the rubber O-shaped ring for high-pressure hydrogen.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a testing device capable of analyzing the influence of the O-shaped ring wire diameter on the high-pressure sealing performance, and the relation between the leakage rate under different sealing medium pressures and the size of the rubber O-shaped ring wire diameter can be compared.
In order to achieve the purpose, the invention adopts the technical scheme that:
a testing device capable of analyzing influence of O-shaped ring line diameter on high-pressure sealing performance comprises a cylinder body 3 with a threaded gland 2, wherein a gas inlet pipe 13 and a gas outlet pipe 8 are communicated with the side wall of the cylinder body 3, a bearing cover 15 is arranged below the gland 2, a central conical cover 22 with an inverted cone shape is arranged at the center of the bottom of the bearing cover 15, the central conical cover 22 and a large conical cover 23 are installed in a matching mode, a pressing pad 14 is arranged between the bottom surface of the bearing cover 15 and the top surface of the central conical cover 22, the inner wall of the cylinder body 3 is in close contact with the outer wall of the bearing cover 15 and is provided with a cylinder cover sealing O-shaped ring 24 and a cylinder cover sealing triangular pad 25, a plurality of annular sealing grooves I located at different heights are formed around the outer wall of the central conical cover 22, a small-line-diameter O-shaped ring is respectively arranged in each annular sealing groove I, a plurality of annular sealing grooves II located at different heights are formed around the outer wall of the large conical cover 23, and large-wire-diameter O-shaped rings are respectively arranged in the annular sealing grooves II.
Preferably, the air inlet pipe 13 is connected with the air pressurizing bin 10, an air inlet control valve 11, a one-way valve 12 and a pressure detection meter 9 are arranged on a connecting pipeline, and an air outlet pipeline conical sleeve 27 and an air outlet pipeline cushion 28 are arranged between the cylinder body 3 and the air outlet pipe 8; outlet duct 8 divide into two the tunnel, connects gaseous collection storehouse 5 all the way and is provided with gas outlet control valve 4 on connecting the pipeline, and another way is connected quick gas vent 6 and is provided with quick off-load valve 7 on connecting the pipeline, there are inlet pipeline pad 29 and inlet pipeline taper sleeve 30 between cylinder body 3 and the intake pipe 13, outlet pipeline pad 28 and inlet pipeline pad 29's material is polytetrafluoroethylene, and outlet pipeline taper sleeve 27 and inlet pipeline taper sleeve 30's material is beryllium bronze.
Preferably, there are outer triangle pad 16 and interior triangle pad 17 of annular between the bottom surface of accepting lid 15 and the top surface of big conical cover 23, screw gland 2 and accepting lid 15 are opened and are had the air vent that link to each other vertically, connect to the leak detection point 1 between outer triangle pad 16 and the interior triangle pad 17.
Preferably, the vertex angle of the cross section triangle of the outer triangular pad 16 faces inwards, the vertex angle of the cross section triangle of the inner triangular pad 17 faces outwards, the diameter of the outer triangular pad 16 in a free state is 1-3 mm larger than that of the sealing groove in which the outer triangular pad is located, the diameter of the inner triangular pad 17 in a free state is 1-3 mm smaller than that of the sealing groove in which the inner triangular pad is located, and the materials of the outer triangular pad 16, the inner triangular pad 17 and the cylinder cover sealing triangular pad 25 are beryllium bronze.
Preferably, the cylinder head sealing O-ring 24 and the cylinder head sealing triangular gasket 25 are in upper and lower contact, and the cylinder head sealing triangular gasket 25 is positioned above the cylinder head sealing O-ring 24.
Preferably, the outer side walls of the first annular sealing groove and the second annular sealing groove are both provided with annular pads 26, the annular pads 26 are of a double-split type or a three-split type structure, and the annular pads 26 are made of annealed red copper.
Preferably, a positioning cylinder is arranged at the center of the bottom of the pressing pad 14, a positioning hole is arranged at the center of the top of the central conical cover 22, a small positioning circular hole is processed on the large conical cover 23, and a small positioning circular hole is processed on the cylinder body 3.
Preferably, the central conical cover 22 has a first fan-shaped lateral protrusion, the large conical cover 23 has a second fan-shaped lateral protrusion and a first internal limiting guide rail, and the cylinder body 3 has a second fan-shaped internal limiting guide rail, wherein the first internal limiting guide rail is matched with the first lateral protrusion, and the second internal limiting guide rail is matched with the second lateral protrusion.
Preferably, the screw gland 2 is provided with a circular ring convex part, clamping planes are processed on two sides of the circular ring convex part, and a circular groove for hoisting is processed on the side surface.
Preferably, the material of the compression pad 14 and the cylinder head sealing O-ring 24 is silicon rubber, and the material of the small-wire-diameter O-ring and the material of the large-wire-diameter O-ring are rubber materials or metal materials.
Compared with the prior art, the invention has the beneficial effects that:
the specific wire diameter control of the small-wire diameter rubber O-shaped ring and the large-wire diameter rubber O-shaped ring is realized by utilizing the matching of the side surface bulge of the central conical cover 22 and the internal limiting guide rail of the large conical cover 23 and the matching of the side surface bulge of the large conical cover 23 and the internal limiting guide rail of the cylinder body 3. And through the alternate use of the outer triangular cushion 16 and the inner triangular cushion 17 and the utilization of the combined sealing structure of the cylinder cover sealing triangular cushion 25 and the annular cushion 26, the uniqueness of a leakage channel in the testing process of the small-wire-diameter and large-wire-diameter rubber O-shaped ring is ensured, so that the analysis of the relationship between the leakage rate under different sealing medium pressures and the wire diameter of the rubber O-shaped ring is realized.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
FIG. 2 is a schematic structural diagram of a rubber O-ring testing part.
FIG. 3 is a schematic view of the internal structure of the main adjusting part of the wire diameter of the rubber O-shaped ring.
FIG. 4 is an appearance schematic diagram of a main adjusting part of the wire diameter of the rubber O-shaped ring.
Fig. 5 is a schematic diagram of the internal structure of the large conical cover.
Fig. 6 is a schematic view of the internal structure of the cylinder.
Fig. 7 is a schematic view of the principle of adjusting the wire diameter of the rubber O-ring.
Fig. 8 is a schematic structural view of a sealing part of the gas outlet pipeline.
Fig. 9 is a schematic structural view of a sealing portion of an intake pipe.
Fig. 10 is an external view of the screw gland.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings and examples.
The invention discloses a testing device capable of analyzing the influence of the wire diameter of an O-shaped ring on the high-pressure sealing performance, which is used for testing the influence of the wire diameter of the O-shaped ring on the sealing performance of high-pressure gas such as hydrogen, helium, air and the like. In the invention, high pressure generally means that the container can bear the test pressure of 140MPa or more theoretically through wall thickness design, material selection, strength check and the like.
The structure of the invention refers to fig. 1 and fig. 2, and comprises a cylinder body 3, a coaxial bearing cover 15, a pressing pad 14, a central conical cover 22 and a large conical cover 23 which are assembled at the top in the cylinder body 3 from top to bottom through a screw gland 2, wherein, referring to fig. 10, the screw gland 2 is annular in main body, the upper part of the screw gland is provided with a circular ring bulge, and two sides of the circular ring bulge are provided with clamping planes and can be provided with circular grooves for hoisting. The center of the bottom of the pressing pad 14 is provided with a positioning cylinder, the center of the top of the central conical cover 22 is provided with a positioning hole, the large conical cover 23 is processed with a small positioning round hole, and the cylinder body 3 is processed with a small positioning round hole so as to be convenient for positioning and installation.
Accept lid 15 and be located gland 2 below, refer to fig. 3 and 4, for the round platform of cylindricality or narrow down, its lateral wall closely contacts with the inside wall of cylinder body 3, and it has the ring channel to open on the lateral wall, be provided with cylinder cap seal O type circle 24 and cylinder cap seal triangle pad 25 in the groove, cylinder cap seal O type circle 24 and cylinder cap seal triangle pad 25 contact from top to bottom, and cylinder cap seal triangle pad 25 is located the top of cylinder cap seal O type circle 24, cylinder body 3 and accept and adopt the mode of combined seal to make its sealed effect better between the lid 15, cylinder cap seal triangle pad 25 can prevent that cylinder cap seal O type circle 24 from taking place to extrude the inefficacy because of inside medium pressure is too high, and cylinder cap seal triangle pad 25 conical surface has from tight sealing effect. The cylinder cover sealing O-shaped ring 24 is made of silicon rubber, but not limited to silicon rubber, and can also be made of other rubber materials with high elasticity, and the cylinder cover sealing triangular gasket 25 is made of beryllium bronze, but not limited to beryllium bronze, and can also be made of other metal materials with high hardness.
The central cone cover 22 is in the shape of a truncated cone with a wide top and a narrow bottom or can be called as an inverted cone, is connected to the center of the bottom of the receiving cover 15 and is installed to match with the large cone cover 23, and the pressing pad 14 is installed between the bottom surface of the receiving cover 15 and the top surface of the central cone cover 22 and is used for filling the gap between the receiving cover 15 and the central cone cover 22, so that the central cone cover 22 and the large cone cover 23 are fixed in the axial direction. The pressing pad 14 is made of silicon rubber, but not limited to silicon rubber, and may be made of other materials with higher elasticity.
The outer wall of the surrounding center conical cover 22 is provided with a plurality of first annular sealing grooves at different heights, and each first annular sealing groove is provided with a small-wire-diameter O-shaped ring. In this embodiment, two annular seal grooves are provided, and a first small-diameter O-ring 20 and a second small-diameter O-ring 21 are provided, respectively. A plurality of second annular sealing grooves at different heights are formed around the outer wall of the large conical cover 23, and large-wire-diameter O-shaped rings are arranged in the second annular sealing grooves respectively. In this embodiment, two annular seal grooves are provided, and a first large-wire-diameter O-ring 18 and a second large-wire-diameter O-ring 19 are respectively provided. The first small-wire-diameter O-ring 20, the second small-wire-diameter O-ring 21, the first large-wire-diameter O-ring 18, and the second large-wire-diameter O-ring 19 are not limited to rubber materials, and may be O-rings made of metal materials, non-metal materials, or other materials having characteristic dimensions that satisfy the sealing groove structure.
Referring to fig. 4, 5 and 6, the central cone cover 22 has fan-shaped side protrusions, the large cone cover 23 has fan-shaped side protrusions and inner limit rails, and the cylinder body 3 has fan-shaped inner limit rails, but these shapes are not limited to fan shapes, and may have other shapes with guiding and connecting capabilities. The central conical cover 22 or the large conical cover 23 is axially moved through the change of the height of the step of the contact between the inner limiting guide rail and the outer protrusion, so that the size of the sealing groove is changed, and different rubber O-shaped ring wire diameters are obtained. Because the height of the step of the inner limiting guide rail contacting with the outer protrusion is fixed, the size of the O-shaped ring wire diameter can be changed, and the certainty of the wire diameter is ensured, so that the accurate correspondence of the analysis of the relationship between the leakage rate and the size of the rubber O-shaped ring wire diameter is ensured.
The heights and angles of the conical surfaces of the central conical cover 22, the large conical cover 23 and the cylinder body 3 can be designed according to requirements.
By h1、h2、h3、h4Respectively representing the height of the step of the limit guide rail in the large conical cover 23 contacting with the bulge on the outer side of the central conical cover 22, and because the central conical cover 22 is provided with two sealing grooves, the wire diameters of eight small-wire-diameter O-shaped rings can be obtained (the first small-wire-diameter O-shaped ring 20 and the second small-wire-diameter O-shaped ring 21 only represent h1The corresponding two small-wire-diameter O-shaped rings and the rest small-wire-diameter O-shaped rings are not drawn), and the quantity requirement of comparative analysis of experimental results can be met. The small round hole positioned by the large conical cover 23 is used as a starting point, and the step heights are sequentially increased along the clockwise direction, so that the step heights can be conveniently distinguished and the experiment operation is facilitated. The height (h) of the step of the limit guide rail in the large conical cover 23 contacting with the convex outside of the central conical cover 221、h2、h3、h4) The number of the sealing grooves of the central conical cover 22 is not limited to two, and the sealing grooves can be arranged as requiredAnd (6) counting.
With H1、H2、H3、H4Respectively representing the height of the steps of the limiting guide rail in the cylinder body 3 and the convex contact of the outer side of the large conical cover 23, and because the large conical cover 23 is provided with two sealing grooves, the wire diameters of eight large-wire-diameter O-shaped rings can be obtained (the first large-wire-diameter O-shaped ring 18 and the second large-wire-diameter O-shaped ring 19 only represent H1The corresponding two large-wire-diameter O-shaped rings and the rest large-wire-diameter O-shaped rings are not drawn), and the quantity requirement of comparative analysis of experimental results can be met. Use the little round hole of cylinder body 3 location as the starting point, along clockwise, the step height increases in proper order, the operation of the differentiation of the step height of being convenient for and experiment. Height of step (H) of limiting guide rail in cylinder 3 contacting with outside protrusion of large conical cover 231、H2、H3、H4) Not limited to four, and can be designed according to requirements.
Referring to fig. 7, the annular pads 26 are disposed on the outer sidewalls of the first annular sealing groove and the second annular sealing groove, the annular pads 26 are of a double-split structure or a triple-split structure, and the annular pads 26 are made of annealed red copper, but not limited to annealed red copper, and may be made of other metal materials with better ductility. The structure of the O-shaped ring can be a double-split structure, but not limited to the double-split structure, and the O-shaped ring can also be processed into a three-split structure or a multi-split structure according to the line diameter and the installation difficulty of the O-shaped ring.
An annular outer triangular gasket 16 and an annular inner triangular gasket 17 are arranged between the bottom surface of the receiving cover 15 and the top surface of the large conical cover 23, the threaded gland 2 and the receiving cover 15 are provided with vertical through vent holes and connected to a leakage detection point 1 between the outer triangular gasket 16 and the inner triangular gasket 17, and leakage of the first small-wire-diameter O-shaped ring 20, the second small-wire-diameter O-shaped ring 21, the first large-wire-diameter O-shaped ring 18 or the second large-wire-diameter O-shaped ring 19 can be detected respectively by a gas collection method.
The vertex angle of the cross section triangle of the outer triangular pad 16 faces inwards, the vertex angle of the cross section triangle of the inner triangular pad 17 faces outwards, the outer triangular pad 16 and the inner triangular pad 17 are made of beryllium bronze, but the outer triangular pad and the inner triangular pad are not limited to the beryllium bronze and can be made of other metal materials with higher hardness, the diameter of the outer triangular pad 16 in a free state is 1-3 mm larger than that of a sealing groove in which the outer triangular pad is located, and the diameter of the inner triangular pad 17 in the free state is 1-3 mm smaller than that of the sealing groove in which the inner triangular pad is located.
Referring to fig. 1, the lateral wall of cylinder body 3 communicates with intake pipe 13 and outlet duct 8, and intake pipe 13 connects gaseous pressure boost storehouse 10 and is provided with air inlet control valve 11, check valve 12 and pressure detection table 9 on connecting the pipeline, and pressure detection table 9 is used for detecting whether pressure pressurizes the setting value before 3 inside gas tests of cylinder body, pressure fluctuation during the test and whether evacuation after the test, and check valve 12 can prevent the gas reflux. The gas outlet pipe 8 is divided into two paths, one path is connected with the gas collecting bin 5 and is provided with a gas outlet control valve 4 on the connecting pipeline, the other path is connected with the quick gas outlet 6 and is provided with a quick unloading valve 7 on the connecting pipeline. Referring to fig. 8 and 9, a tapered sleeve 27 of the outlet pipe and a cushion 28 of the outlet pipe are arranged between the cylinder 3 and the outlet pipe 8; an air inlet pipeline gasket 29 and an air inlet pipeline conical sleeve 30 are arranged between the cylinder body 3 and the air inlet pipe 13, conical surfaces of the air outlet pipeline conical sleeve 27 and the air inlet pipeline conical sleeve 30 have a self-tightening sealing effect, and the self-tightening effect is more obvious under the action of high-pressure gas. The use of the air outlet pipeline cushion 28 and the air inlet pipeline cushion 29 improves the matching effect of the air outlet pipeline conical sleeve 27 and the air inlet pipeline conical sleeve 30 with the cylinder body 3, and reduces the abrasion of the air outlet pipeline conical sleeve 27 and the air inlet pipeline conical sleeve 30. The air outlet pipeline pad 28 and the air inlet pipeline pad 29 are made of teflon, but not limited to teflon, and may be made of other materials with good wear resistance. The outlet pipeline conical sleeve 27 and the inlet pipeline conical sleeve 30 are made of beryllium bronze, but the outlet pipeline conical sleeve is not limited to beryllium bronze and can also be made of other metal materials with higher hardness.
According to the above structure, the test procedure of the present invention is as follows:
before testing, sealing rings to be tested (a first large-wire-diameter O-shaped ring 18, a second large-wire-diameter O-shaped ring 19, a first small-wire-diameter O-shaped ring 20 or a second small-wire-diameter O-shaped ring 21) are arranged in corresponding sealing grooves, the threaded gland 2 and the cylinder body 3 are fixed, and the air outlet control valve 4 and the quick unloading valve 7 are closed. The inlet control valve 11 is opened and the gas introduced is pressurized by the gas pressurizing chamber 10. After the pressure detected by the pressure detection meter 9 reaches a set value, controlling the closing of the air inlet control valve 11; during testing, if the gas pressure in the cylinder 3 fluctuates (leakage is detected at the leakage detection point 1), the quick unloading valve 7 is controlled to be opened, and quick unloading is carried out through the quick exhaust port 6; after the test is finished, the gas outlet control valve 4 is opened, and gas is recovered through the gas collection bin 5.
On the basis that the cylinder cover sealing O-shaped ring 24 and the cylinder cover sealing triangular gasket 25 are combined in a sealing mode to ensure sealing between the cylinder body 3 and the receiving cover 15, when a first small-wire-diameter O-shaped ring 20 or a second small-wire-diameter O-shaped ring 21 is tested, only the outer triangular gasket 16 is placed between the receiving cover 15 and the large conical cover 23, and because the outer triangular gasket 16 is made of a metal material with higher strength and the conical surface of the outer triangular gasket is matched with the conical surface of the outer triangular gasket to have a self-tightening sealing effect, gas leaked between the central conical cover 22 and the large conical cover 23 can be completely discharged and detected through the leakage detection point 1; when the first large-wire-diameter O-shaped ring 18 or the second large-wire-diameter O-shaped ring 19 is tested, only the inner triangular cushion 17 is placed between the bearing cover 15 and the large conical cover 23, and the inner triangular cushion 17 is made of a metal material with higher strength and has a self-tightening sealing effect in conical surface matching, so that gas leaked between the cylinder body 3 and the large conical cover 23 can be completely discharged and detected through the leakage detection point 1.
For the small-wire-diameter O-shaped ring between the central conical cover 22 and the large conical cover 23, the change of the wire diameter of the small-wire-diameter O-shaped ring is realized through the matching of the protrusion on the side surface of the central conical cover 22 and the limiting guide rail in the large conical cover 23; for the large-wire-diameter O-shaped ring between the cylinder body 3 and the large conical cover 23, the change of the wire diameter of the large-wire-diameter O-shaped ring is realized through the matching of the side surface bulge of the large conical cover 23 and the limiting guide rail in the cylinder body 3.
During testing, firstly, the influence of the line diameter on the high-pressure sealing performance of the O-shaped ring is compared in a large range through the leakage rate test of the large-line-diameter O-shaped ring (one of eight kinds of optional large-line-diameter O-shaped rings) and the small-line-diameter O-shaped ring (one of eight kinds of optional small-line-diameter O-shaped rings), so that the influence degree of the large and small line diameters is judged; and then the height of the step is adjusted through the matching of the outer side bulge of each adjusting part and the inner limiting guide rail, the influence of the line diameter on the high-pressure sealing performance of the O-shaped ring is compared in a small range, and guidance can be provided for the optimization of the line diameter of the O-shaped ring with the large line diameter or the O-shaped ring with the small line diameter.
When the height of the step is adjusted by matching the outer protrusion with the inner limiting guide rail (the variable quantity is delta h), the gap between the inner conical surface of the large conical cover 23 and the sealing groove surface of the central conical cover 22 and the gap between the inner conical surface of the cylinder body 3 and the sealing groove surface of the large conical cover 23 are changed, the cross section sizes of the large-diameter O-shaped ring and the small-diameter O-shaped ring are consistent by placing the annular gasket 26, only the diameter of the O-shaped ring is an independent variable under the same medium pressure, and the feasibility and the accuracy of experimental analysis are guaranteed. In particular, the annular gasket 26 is designed in a split structure for ease of assembly.
Refer to tables 1 and 2 with d1、d2、d3、d4、d5、d6、d7、d8Respectively represent the wire diameter of the O-shaped ring with small wire diameter, and q isk1、qk2、qk3、qk4、qk5、qk6、qk7、qk8(k represents different sealing medium pressures) respectively represent the leakage rate of the O-shaped ring with the small wire diameter, and the D represents the leakage rate1、D2、D3、D4、D5、D6、D7、D8Respectively represent the wire diameter of the O-shaped ring with large wire diameter, and Q is usedk1、Qk2、Qk3、Qk4、Qk5、Qk6、Qk7、Qk8And (k represents different sealing medium pressures) respectively represent the leakage rate of the O-shaped ring with the large wire diameter so as to analyze the relationship between the leakage rate and the wire diameter of the rubber O-shaped ring under different sealing medium pressures. The table may be adjusted according to the actual data record.
TABLE 1 Small-wire-diameter O-shaped ring sealing performance test
TABLE 2 Large wire diameter O-shaped ring sealing performance test
The working principle of the invention is as follows: the specific wire diameter control of the small-wire diameter rubber O-shaped ring and the large-wire diameter rubber O-shaped ring is realized by utilizing the matching of the side surface bulge of the central conical cover 22 and the internal limiting guide rail of the large conical cover 23 and the matching of the side surface bulge of the large conical cover 23 and the internal limiting guide rail of the cylinder body 3. And through the alternate use of the outer triangular cushion 16 and the inner triangular cushion 17 and the utilization of the combined sealing structure of the cylinder cover sealing triangular cushion 25 and the annular cushion 26, the uniqueness of a leakage channel in the testing process of the small-wire-diameter and large-wire-diameter rubber O-shaped ring is ensured, so that the analysis of the relationship between the leakage rate under different sealing medium pressures and the wire diameter of the rubber O-shaped ring is realized.
Claims (8)
1. A testing device capable of analyzing influence of the line diameter of an O-shaped ring on high-pressure sealing performance comprises a cylinder body (3) with a threaded gland (2), and is characterized in that the side wall of the cylinder body (3) is communicated with an air inlet pipe (13) and an air outlet pipe (8), a bearing cover (15) is arranged below the gland (2), a central conical cover (22) with an inverted cone shape is arranged at the center of the bottom of the bearing cover (15), the central conical cover (22) and a large conical cover (23) are installed in a matching mode, a compression pad (14) is arranged between the bottom surface of the bearing cover (15) and the top surface of the central conical cover (22), the inner wall of the cylinder body (3) is in close contact with the outer wall of the bearing cover (15) and is provided with a cylinder cover sealing O-shaped ring (24) and a cylinder cover sealing triangular pad (25), a plurality of annular sealing grooves I which are located at different heights are formed around the outer wall of the central conical cover (22), and small-line-diameter O-shaped rings are respectively arranged in each annular sealing groove I, a plurality of second annular sealing grooves which are positioned at different heights are formed on the outer wall surrounding the large conical cover (23), and large-wire-diameter O-shaped rings are arranged in the second annular sealing grooves respectively;
the air inlet pipe (13) is connected with the air pressurizing bin (10), an air inlet control valve (11), a one-way valve (12) and a pressure detection meter (9) are arranged on a connecting pipeline, and an air outlet pipeline conical sleeve (27) and an air outlet pipeline cushion (28) are arranged between the cylinder body (3) and the air outlet pipe (8); the gas outlet pipe (8) is divided into two paths, one path is connected with the gas collecting bin (5), a gas outlet control valve (4) is arranged on a connecting pipeline, the other path is connected with the rapid gas outlet (6), a rapid unloading valve (7) is arranged on the connecting pipeline, and a gas inlet pipeline cushion (29) and a gas inlet pipeline conical sleeve (30) are arranged between the cylinder body (3) and the gas inlet pipe (13);
an annular outer triangular pad (16) and an annular inner triangular pad (17) are arranged between the bottom surface of the bearing cover (15) and the top surface of the large conical cover (23), and the screw gland (2) and the bearing cover (15) are provided with vertical through vent holes which are connected to leakage detection points (1) between the outer triangular pad (16) and the inner triangular pad (17);
the vertex angle of the cross section triangle of the outer triangular pad (16) faces inwards, the vertex angle of the cross section triangle of the inner triangular pad (17) faces outwards, the diameter of the outer triangular pad (16) in a free state is 1-3 mm larger than that of the sealing groove in which the outer triangular pad is positioned, and the diameter of the inner triangular pad (17) in a free state is 1-3 mm smaller than that of the sealing groove in which the inner triangular pad is positioned;
the central conical cover (22) is provided with a fan-shaped side surface protrusion I, the large conical cover (23) is provided with a fan-shaped side surface protrusion II and an internal limiting guide rail I, the cylinder body (3) is provided with a fan-shaped internal limiting guide rail II, the internal limiting guide rail I is matched with the side surface protrusion I, and the internal limiting guide rail II is matched with the side surface protrusion II.
2. The device for testing the influence of the wire diameter of the O-shaped ring on the high-pressure sealing performance is analyzed according to claim 1, and is characterized in that the material of the air outlet pipeline gasket (28) and the material of the air inlet pipeline gasket (29) are polytetrafluoroethylene, and the material of the air outlet pipeline conical sleeve (27) and the material of the air inlet pipeline conical sleeve (30) are beryllium bronze.
3. The device for testing the influence of the wire diameter of the O-shaped ring on the high-pressure sealing performance is analyzed according to claim 1, and is characterized in that the materials of the outer triangular pad (16), the inner triangular pad (17) and the cylinder cover sealing triangular pad (25) are beryllium bronze.
4. The device for testing the influence of the wire diameter of the O-shaped ring on the high-pressure sealing performance is analyzed according to claim 1, wherein the cylinder cover sealing O-shaped ring (24) is in up-and-down contact with a cylinder cover sealing triangular gasket (25), and the cylinder cover sealing triangular gasket (25) is positioned above the cylinder cover sealing O-shaped ring (24).
5. The device for testing the influence of the wire diameter of the O-shaped ring on the high-pressure sealing performance according to claim 1, wherein the outer side walls of the first annular sealing groove and the second annular sealing groove are both provided with annular gaskets (26), each annular gasket (26) is of a double-split type or a three-split type structure, and each annular gasket (26) is made of annealed red copper.
6. The device for testing the influence of the wire diameter of the O-shaped ring on the high-pressure sealing performance is analyzed according to claim 5, wherein a positioning cylinder is arranged at the center of the bottom of the compression pad (14), a positioning hole is formed in the center of the top of the central conical cover (22), a small positioning circular hole is machined in the large conical cover (23), and a small positioning circular hole is machined in the cylinder body (3).
7. The device for testing the influence of the wire diameter of the O-shaped ring on the high-pressure sealing performance according to claim 1, wherein the screw gland (2) is provided with a circular ring convex part, clamping planes are machined on two sides of the circular ring convex part, and a circular groove for hoisting is machined on the side surface of the circular ring convex part.
8. The device for testing the influence of the wire diameter of the O-shaped ring on the high-pressure sealing performance is analyzed according to claim 1, wherein the material of the compression gasket (14) and the material of the cylinder cover sealing O-shaped ring (24) are silicon rubber, and the material of the small-wire-diameter O-shaped ring and the material of the large-wire-diameter O-shaped ring are rubber materials or metal materials.
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| CN114486092B (en) * | 2022-01-03 | 2022-11-08 | 浙江大学 | Test device for testing performance of non-metal sealing element in high-pressure hydrogen environment |
| CN114441104B (en) * | 2022-01-03 | 2022-11-08 | 浙江大学 | Method for testing performance of non-metal sealing piece in high-pressure hydrogen environment |
| CN117906940B (en) * | 2024-03-20 | 2024-07-19 | 山东北方创信防水科技集团股份有限公司 | Sealing performance detection device for rubber sealing ring |
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| CN102879189B (en) * | 2012-09-28 | 2014-11-12 | 南京林业大学 | Non-metallic O-shaped ring performance testing device |
| CN204101244U (en) * | 2014-09-26 | 2015-01-14 | 十堰玉宇工贸有限公司 | Gas-holder end cap air tightness detection machine |
| CN104568621B (en) * | 2014-11-04 | 2017-09-26 | 中国航天科工集团第六研究院四十一所 | A kind of " O " type rebound rate of sealing ring devices and methods therefor |
| CN104634529A (en) * | 2015-02-13 | 2015-05-20 | 清华大学 | Experiment table for measuring mounting rigidity and damping of sealing ring |
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| CN106706220B (en) * | 2017-01-12 | 2023-03-21 | 华南理工大学 | Device for testing sealing performance of rubber O-shaped ring in high-pressure hydrogen environment |
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