Sealing ring test device and test method for quick-opening blind plate

Abstract

The invention discloses a sealing ring test device for a quick-opening blind plate and a test method, and relates to the technical field of machinery, the sealing ring test device comprises a lower cover and an upper cover matched with the lower cover, the inner surface of the upper cover or the lower cover is provided with a sealing groove used for installing a sealing ring, and the outer surface of the upper cover or the outer surface of the lower cover is provided with a connecting channel used for being communicated with a test medium; the test device further comprises a gap generating mechanism, the gap generating mechanism acts on the upper cover and the lower cover, a gap is generated between the upper cover and the lower cover, and the connecting channel is communicated with the sealing groove through the gap. The sealing rings with different sizes are tested and detected by using the testing devices, and the sealing rings are tested through close matching of the upper cover and the lower cover, so that the quality control of the sealing rings in the quick-opening blind plate is improved, the rejection rate is reduced, and the service life of the quick-opening blind plate is prolonged.

Description

Technical Field

[0001] This invention relates to the field of mechanical technology, and in particular to a testing device and method for a sealing ring used in quick-opening blind flanges. Background Technology

[0002] Quick-opening blind flanges are mechanical devices used on the circular openings of pressure pipelines or pressure vessels to achieve rapid opening or closing. They can be classified into clamp type, toothed type, snap-fit ​​type, and pressure ring type based on their structure. Among these types, pressure ring type quick-opening blind flanges are the most widely used and numerous. Pressure ring type quick-opening blind flanges are highly praised by users for their simple and practical structure and excellent sealing ring performance. The sealing characteristics of pressure type quick-opening blind flanges are particularly outstanding, which is inseparable from the important role played by the lip seal rings they use.

[0003] Pressure ring type quick-opening blind flanges use a lip seal. The center of this seal is usually a C-shaped cavity. After the blind flange is pressurized, the medium can fill the entire C-shaped cavity. As the pressure continues to rise, the C-shaped cavity of the seal expands outwards, causing the seal to adhere tightly to the surface of the sealing groove to achieve a sealing effect. However, if new seals are directly applied to blind flanges without testing after being molded, some seals may not meet the internal pressure requirements of the blind flange due to unreasonable design. After a period of operation, the seals may suffer local damage or breakage due to excessive pressure, or even be directly squeezed out of the blind flange sealing groove. Other seals may have excessive hardness due to unsuitable material ratios or vulcanization time and temperature during manufacturing. During use, this can lead to situations where the seal has poor rubber elasticity and cannot be installed into the sealing groove, or the blind flange cover cannot be fully closed after installation due to its excessive hardness.

[0004] Therefore, providing a testing device and method for lip seals is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a testing device and method for lip seals to solve the problems existing in the prior art, so that manufacturers can conduct simple experiments to test lip seals and ensure that the produced lip seals meet the quality standards required for pressure ring quick-opening blind flanges.

[0006] To achieve the above objectives, the present invention provides the following solution: This invention provides a sealing ring testing device for quick-opening blind flanges, comprising: a lower cover and an upper cover that cooperates with the lower cover; the inner surface of the upper cover or the lower cover is provided with a sealing groove for installing the sealing ring; the outer surface of the upper cover or the outer surface of the lower cover is provided with a connecting channel for communicating with a test medium; and further comprising a gap generating mechanism, which acts on the upper cover and the lower cover to generate a gap between the upper cover and the lower cover, wherein the connecting channel communicates with the sealing groove through the gap.

[0007] As one embodiment, the upper cover and the lower cover are provided with a plurality of flange holes that correspond one-to-one. A plurality of studs are respectively inserted into the plurality of flange holes of the upper cover and the lower cover, and nuts of the same number as the studs are tightened to fix the upper cover and the lower cover.

[0008] As one embodiment, the gap-generating mechanism includes a gasket inserted between the upper cover and the lower cover. The gasket has an overall elliptical structure, and one end of the gasket has a circular opening for use as a hand hole.

[0009] As one embodiment, the other end of the aforementioned gasket is provided with a semi-circular notch for insertion between the upper cover and the lower cover.

[0010] As one embodiment, both the upper cover and the lower cover are circular in shape.

[0011] As one embodiment, both the upper cover and the lower cover are further provided with reinforcing rib assemblies on their outer surfaces to enhance the overall strength of the upper cover and the lower cover.

[0012] As one embodiment, the inner surface of the upper cover and / or the lower cover is further provided with a buffer groove for slowing down the flow rate of the test medium, and the buffer groove is in communication with the connecting channel.

[0013] As one implementation method, the aforementioned connection channel is a pressure-pressurized pipe.

[0014] As one embodiment, the upper cover and the lower cover are provided with corresponding lugs for simulating the vertical position of the quick-opening blind plate.

[0015] This invention also discloses a test method for a sealing ring of a quick-opening blind flange, using the sealing ring test device for quick-opening blind flanges as described above, including the following steps: S1: Determine the test medium and connect it to the corresponding test medium equipment through the connection channel; S2: Pressurize the test device to the set pressure and maintain the pressure for a certain period of time according to the set requirements; S3: Conduct multiple tests under different pressure conditions and record the corresponding test data and results; S4: Analyze the experimental results based on the different outcomes and draw corresponding experimental conclusions. The present invention achieves the following technical effects compared to the prior art: The testing device disclosed in this application has a simple structure and a wide range of applications. By manufacturing testing devices of different sizes in proportion to the present application, these devices can be used to test and inspect sealing rings of different sizes. Through the close fit between the upper and lower covers, the environment in actual use of quick-opening blind flanges is simulated, making the test results closer to the actual use effect. Through the gap generation mechanism, the test results are further made closer to the actual use structure. This solves the problem in the prior art that it is impossible to quickly and effectively test the quality of sealing rings. Regardless of high pressure, low pressure, or pressure changes, this device can be used to simulate and test the sealing design of blind flanges before they are put into formal production, improving the quality control of sealing rings in quick-opening blind flanges, reducing the scrap rate, and increasing the service life of quick-opening blind flanges. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is an isometric view of the lip seal test device of this application; Figure 2 This is a front view of the lip seal testing device of this application; Figure 3 This is a cross-sectional view of the lip seal test device of this application; Figure 4 This is a partial enlarged cross-sectional view of the lip seal test device of this application; Figure 5 This is a gasket diagram of the lip seal test device for this application; Figure 6 This is a schematic diagram of the blind flange seal ring installation in this application; Figure 7 This is a schematic diagram of the sealing ring in this application; Figure 8 This is a diagram of the sealing ring test system for this application; Figure 9 This is a flowchart of the sealing ring test procedure for this application; The components are as follows: 1. Lifting lug; 2. Gasket; 3. Stud; 4. Nut; 5. Upper cover; 6. Lower cover; 7. Pressure testing pipe; 8. Reinforcing rib plate assembly; 9. Sealing ring; 10. Sealing groove; 11. Buffer groove; 12. First valve; 13. Second valve; 14. Third valve; 15. Fourth valve; 16. Fifth valve; 17. First pressure gauge; 18. Second pressure gauge; 19. Hydraulic pump; 20. Pneumatic compressor; 21. Gasket insertion port; 22. Gasket hand hole; 91. Upper lip of sealing ring; 92. C-shaped cavity of sealing ring; 93. Lower lip of sealing ring. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] The purpose of this invention is to provide a testing device and method for sealing rings used in quick-opening blind flanges, in order to solve the problems existing in the prior art. This allows manufacturers to conduct simple experiments on lip seals to ensure that the produced lip seals meet the quality standards required for sealing rings in pressure ring quick-opening blind flanges.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1 This invention provides a sealing ring testing device for quick-opening blind flanges, comprising an upper cover 5 and a lower cover 6 that cooperate with each other. The cooperation method of the upper cover 5 and the lower cover 6 can be freely selected according to the actual situation. For example, they can be connected by the cooperation between studs 3 and nuts 4. The upper cover 5 and the lower cover 6 are provided with corresponding flange holes. The diameter and number of flange holes can be freely selected according to the actual situation, ensuring that they can cooperate with the selected studs 3 and nuts 4. At the same time, it is also necessary to ensure that the upper cover 5 and the lower cover 6 are tightly fitted. The studs 3 are inserted into the flange holes of the upper cover 5 and the lower cover 6 respectively, and these studs 3 are tightened by nuts 4 to achieve the purpose of fixing the upper cover 5 and the lower cover 6.

[0022] The inner surface of the upper cover 5 or the lower cover 6 is provided with a sealing groove 10, which is used to fix the sealing ring 9 to the inner surface of the upper cover 5 or the lower cover 6. When the upper cover 5 and the lower cover 6 are engaged, the sealing ring 9 will not fall off. The outer surface of the upper cover 5 or the lower cover 6 is provided with a connection channel that communicates with the test medium. When the test medium is determined, the test medium enters the sealing groove 10 through the connection channel and fills the sealing ring 9.

[0023] The type of sealing ring 9 tested can be freely selected according to actual conditions. Taking a lip seal as an example, the sealing principle of a lip seal is that when the medium flows towards the sealing ring 9, it first flows into the C-shaped cavity 92 of the sealing ring. When the medium completely fills the C-shaped cavity 92, the pressure inside the C-shaped cavity 92 increases, and the upper lip 91 and lower lip 93 of the sealing ring will tightly adhere to the surface of the sealing groove 10, preventing the medium from flowing out and achieving the sealing function (e.g., ...). Figure 7 As shown), when the blind flange is fitted with the sealing ring 9, the upper lip 91 of the sealing ring will naturally tilt upwards. When closing the blind flange cover, it is usually impossible to completely flatten the upper lip 91 of the sealing ring by hand. To facilitate the installation of the lip-shaped sealing ring 9, a gap is left between the blind flange cover and the blind flange seat when designing the blind flange (e.g., Figure 6 As shown in the figure, this test device also includes a gap generation mechanism, which acts on the upper cover 5 and the lower cover 6 to create a gap between the upper cover 5 and the lower cover 6, making the test environment closer to the actual environment when using a blind plate, and the test conclusions obtained are more realistic.

[0024] During the test, the test medium is first determined, and the sealing ring 9 to be tested is placed into the sealing groove 10. Then, the upper cover 5 and the lower cover 6 are tightly fitted together. The gap generating mechanism directly generates the gap required for the test between the upper cover 5 and the lower cover 6. After preparation, the test medium is introduced into the sealing groove 10 through the connecting channel. Then, the test medium enters the sealing ring 9 and fills the sealing ring 9. After a period of pressure holding, the test is completed, the experimental data is recorded, and the test results are analyzed.

[0025] The aforementioned gap-generating mechanism can be freely selected according to actual needs. For example, by inserting a gasket 2 between the upper cover 5 and the lower cover 6, the gasket 2 can be made into a standard gasket 2, with each gasket 2 set to a fixed thickness. The thickness of the gasket 2 in the experiment is determined by the blind flange designer after considering various factors such as the blind flange size specifications, design pressure, and the weight of the blind flange cover, for example, 0.5mm. The corresponding number of gaskets 2 are inserted according to the required gap size to create a gap consistent with the actual size of the quick-opening blind flange in use, simulating the specific environment during use. The gasket 2 is made of thin stainless steel plate and has an overall elliptical structure. A circular opening is provided at one end of the gasket 2, which can be used as a gasket hand hole 22, facilitating the insertion and removal of the gasket 2 by hand or tools. A semi-circular notch is provided at the other end, which is the gasket insertion port 21, allowing the gasket insertion port 21 to be inserted into the circular surface of the stud 3 during use.

[0026] The gap-generating mechanism can also be a hydraulic rod. A telescopic hydraulic rod is inserted between the upper cover 5 and the lower cover 6. The telescopic distance of the hydraulic rod is adjusted as needed. The size of the gap is determined by recording the telescopic distance of the hydraulic rod, thereby simulating the gap when the blind plate is actually used, so that the gap in actual use is consistent with the gap in the test.

[0027] Based on the above, the shapes of the upper cover 5 and the lower cover 6 are both defined as circular. In order to reduce the pressure deformation caused by the pressure test on the outside, the pressure in the center is evenly distributed to the surrounding area, which increases the durability of the upper cover 5 and the lower cover 6.

[0028] Based on the above, a reinforcing rib assembly 8 is added to the outer surface of the upper cover 5 and the lower cover 6 to enhance the overall strength of the upper cover 5 and the lower cover 6, thereby further reducing the pressure deformation caused by the pressure test.

[0029] Based on the above, the inner surface of the upper cover 5 and / or the lower cover 6 is provided with a buffer groove 11. The purpose of the buffer groove 11 is to slow down the flow rate of the test medium into the sealing ring 9. After the test medium enters the sealing ring 9, the upper lip 91 of the sealing ring will naturally tilt upward. When closing the blind flange cover, it is usually impossible to completely flatten the upper lip 91 of the sealing ring by manpower. When the flow rate of the test medium is too fast, it will cause a strong impact on the sealing ring 9. This impact will put additional pressure on the sealing ring 9, affecting the actual test results and causing the test results to deviate. The buffer groove 11 can be set according to specific needs. It can be set only on the upper cover 5 or the lower cover 6, or it can be set on both the upper cover 5 and the lower cover 6 at the same time. The buffer groove 11 is the same as the connection channel connecting the test medium. The test medium will also enter the buffer groove 11 at the same time as entering the sealing ring 9, so as to achieve the effect of buffering the test medium.

[0030] The connection channels mentioned above can be freely selected according to the actual situation. For example, they can be connected through pressure-tested pipe 7, or through ordinary pipes. Alternatively, only openings can be made as connection channels. If there are other reasonable methods, they can also be freely selected.

[0031] Based on the above, a section of the upper cover 5 and the lower cover 6 is provided with corresponding lifting lugs 1. The lifting lugs 1 have two functions: first, to facilitate operation and use during hoisting and installation, so that the entire test device can be lifted by a crane or other means, making it easier to operate the cooperation between the upper cover 5 and the lower cover 6 and improving the efficiency of the test; second, to simulate the position state when the horizontal quick-opening blind flange is in use, so that the test device can be lifted by a crane or other means, simulating the position state of the horizontal quick-opening blind flange, more realistically reproducing the environment during actual use, and making the test results closer to the real use results.

[0032] The differences between vertical quick-opening blind flanges and horizontal quick-opening blind flanges are as follows: Vertical quick-opening blind flange: installed at the end of vertical pipes or equipment (such as the top of vertical storage tanks, the end of vertical process pipes, the vertical interface of towers, etc.). The overall structure is arranged vertically, and the opening direction is mostly upward or downward flipping, which is suitable for vertical installation space.

[0033] Horizontal quick-opening blind flange: installed at the end of horizontal pipes or equipment (such as the end cap of horizontal storage tank, the end of horizontal conveying pipeline, the horizontal interface of heat exchanger, etc.). The overall structure is horizontally arranged, and the opening direction is mostly lateral sliding or tilting, which is suitable for horizontal installation space.

[0034] This application can also simulate the state of a vertical quick-opening blind flange without lifting. Whether or not to lift is to be selected based on the actual test conditions and the type of quick-opening blind flange to be simulated.

[0035] like Figure 9 As shown, the present invention also discloses a test method for a sealing ring for a quick-opening blind flange, comprising the following steps: S1: Determine the test medium and connect it to the corresponding test medium equipment through the connection channel; like Figure 8 As shown, first determine the test medium. If a hydraulic test is to be performed, close the second valve 13 and pressurize the pressure application device using the hydraulic pump 19. Conversely, if a pneumatic test is to be performed, close the first valve 12 and pressurize the test device using the pneumatic compressor 20. Determine the pressure inside the test device by reading the pressure gauge. The connection method between the pressure gauge and the valve can be as shown in the figure, or it can be freely selected according to the actual situation. To ensure the accuracy of the test pressure, the following is used: Figure 8 Taking two pressure gauges as an example, the first pressure gauge 17 and the second pressure gauge 18 are connected in series across the two ends of the third valve 14. When the two gauges display the same number, it indicates that the test pressure is accurate and the test can be carried out. S2: Pressurize the test device to the set pressure and maintain the pressure for a certain period of time according to the set requirements; like Figure 9 As shown, taking the hydraulic test of seal ring 9 as an example, the operation of the entire system is introduced, such as... Figure 8 As shown, first close the second valve 13 and the fifth valve 16, then open the first valve 12, the third valve 14, and the fourth valve 15, and start the hydraulic pump 19 to supply water and pressurize the test device. When the pressure gauge shows that the pressure has risen to the specified requirement, close the first valve 12 to maintain the pressure. After the pressure maintenance is completed, open the fifth valve 16 to release the test fluid from the test device, and one test is completed. S3: Conduct multiple tests under different pressure conditions and record the corresponding test data and results; Depending on the pressure, it is divided into low pressure, medium pressure and high pressure, for example, low pressure 2.5Mpa, medium pressure 6.4Mpa, high pressure 11Mpa. At the same time, different holding times and different gasket thicknesses are set. Based on the above data, multiple controlled variable tests are carried out, and the test results are filled in the report.

[0036] S4: Analyze the experimental results based on the different outcomes and draw corresponding experimental conclusions; Based on the different test results, the sealing ring 9 was analyzed. After the test, if the sealing ring 9 did not leak and the outer surface of the sealing ring 9 was not damaged, it indicates that the sealing ring 9 was reasonably designed and that all parameters were controlled within the qualified range during manufacturing. It can be used in quick-opening blind flanges.

[0037] If leakage or surface damage occurs during the test of sealing ring 9, it can be analyzed according to the specific failure mode, which can be divided into fracture failure and deformation failure depending on the situation.

[0038] Fracture failure can be further classified into the following forms: Ductile fracture: Significant plastic deformation occurs before fracture; Brittle fracture: No obvious plastic deformation occurs before fracture; Fatigue fracture: Under alternating loads, cracks form on or inside the material and propagate, leading to fracture.

[0039] Deformation failure can be classified into the following forms: Elastic deformation failure: Stress or temperature causes excessive recoverable deformation, affecting functionality; Plastic deformation failure: Irreversible excessive deformation, such as gear overload causing tooth profile distortion.

[0040] Based on the different situations described above, specific failure analyses were conducted, and targeted improvements were made to the sealing ring 9.

[0041] If leakage occurs under low pressure, the hardness of the rubber of the sealing ring 9 can be reduced to increase its resilience. The data for increasing resilience can be determined through subsequent tests based on experience. Alternatively, the width of the sealing ring 9 can be increased so that it can fit tightly against the surface of the sealing ring 9 when installed in the sealing groove 10, thus reducing leakage.

[0042] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A sealing ring testing device for a quick-opening blind flange, characterized in that, include: The lower cover (6) and the upper cover (5) that cooperate with the lower cover (6) are provided with a sealing groove (10) for installing a sealing ring (9) on the inner surface of the upper cover (5) or the lower cover (6). The outer surface of the upper cover (5) or the outer surface of the lower cover (6) is provided with a connection channel for communicating with the test medium. The upper cover (5) and the lower cover (6) are also provided with a gap generating mechanism. The gap generating mechanism acts on the upper cover (5) and the lower cover (6) to generate a gap between the upper cover (5) and the lower cover (6). The connection channel communicates with the sealing groove (10) through the gap.

2. The sealing ring testing device for quick-opening blind flanges according to claim 1, characterized in that, The upper cover (5) and the lower cover (6) are provided with a plurality of flange holes corresponding to each other. A plurality of studs (3) are inserted into the plurality of flange holes of the upper cover (5) and the lower cover (6) respectively. Nuts (4) of the same number as the studs (3) are tightened together with the studs (3) to fix the upper cover (5) and the lower cover (6).

3. The sealing ring testing device for quick-opening blind flanges according to any one of claims 1, characterized in that, The gap-generating mechanism includes a gasket (2), which is inserted between the upper cover (5) and the lower cover (6). The gasket (2) has an overall elliptical structure, and one end of the gasket (2) is provided with a circular opening for use as a hand hole.

4. The sealing ring testing device for quick-opening blind flanges according to claim 3, characterized in that, The other end of the gasket is provided with a semi-circular notch for insertion between the upper cover (5) and the lower cover (6).

5. The sealing ring testing device for quick-opening blind flanges according to claim 1, characterized in that, Both the upper cover (5) and the lower cover (6) are circular in shape.

6. The sealing ring testing device for quick-opening blind flanges according to claim 5, characterized in that, The outer surfaces of the upper cover (5) and the lower cover (6) are also provided with reinforcing rib assemblies (8) for enhancing the overall strength of the upper cover (5) and the lower cover (6).

7. The sealing ring testing device for quick-opening blind flanges according to claims 1-5, characterized in that, The inner surface of the upper cover (5) and / or the lower cover (6) is also provided with a buffer groove (11) for slowing down the flow rate of the test medium, and the buffer groove (11) is connected to the connecting channel.

8. The sealing ring testing device for quick-opening blind flanges according to claim 1, characterized in that, The connection channel includes a pressure-pressurizing connector (7).

9. The sealing ring testing device for quick-opening blind flanges according to any one of claims 1-5, characterized in that, The upper cover (5) and the lower cover (6) are provided with corresponding lugs (1) for simulating the vertical position of the quick-opening blind plate.

10. A test method for a sealing ring of a quick-opening blind flange, characterized in that, The application of the quick-opening blind flange sealing ring testing device according to any one of claims 1-9 includes the following steps: S1: Determine the test medium and connect it to the corresponding test medium equipment through the connection channel; S2: Pressurize the test device to the set pressure and maintain the pressure for a certain period of time according to the set requirements; S3: Conduct multiple tests under different pressure conditions and record the corresponding test data and results; S4: Analyze the experimental results based on the different outcomes and draw corresponding experimental conclusions.

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