A fully automated multifunctional carbon material air permeability testing system

Abstract

This utility model discloses a fully automatic multifunctional carbon material permeability testing system, including a vacuum air path, a low-flow air path, a high-flow air path, a four-way pipe, a vent valve, and a sample fixture. The vent valve is sealed and connected to the first port of the four-way pipe, the sample fixture is sealed and connected to the second port of the four-way pipe, the vacuum air path is sealed and connected to the third port of the four-way pipe, and both the low-flow and high-flow air paths are sealed and connected to the fourth port of the four-way pipe. The vacuum air path, low-flow air path, and high-flow air path are all electrically connected to a control center. This system performs vacuum decay method and constant pressure high / low flow method tests on carbon materials, enabling automatic testing of carbon materials with significantly different permeability on the same instrument, thereby improving the testing efficiency and quality control level of carbon material research and development and production.

Description

Technical Field

[0001] This utility model relates to the field of air permeability testing technology, and in particular to a fully automatic multifunctional carbon material air permeability testing system. Background Technology

[0002] Carbon materials, due to their unique physicochemical properties, have wide applications in energy, metallurgy, chemical engineering, aerospace, and other fields. Different application scenarios place significantly different requirements on the air permeability of carbon materials. For example, in extreme sealing applications, such as aerospace and nuclear reactor heat seals, the material's air permeability must be as low as possible, or even almost completely blocked, to ensure no media leakage occurs; when used as air bearings, moderate air permeability is required; while porous carbon felts require high air permeability. Therefore, air permeability, as one of the key performance indicators of carbon materials, directly affects the applicability of products, making its testing crucial for material development, process optimization, and product performance evaluation.

[0003] Parameters for evaluating the gas permeability of carbon products include gas permeability coefficient, permeability, permeation amount, and permeability index. There are three main types of testing methods: The first type is for high-barrier carbon products, using the high-pressure gas permeation method. This involves creating a vacuum side and a high-pressure side on both sides of the material, and calculating the permeability coefficient by monitoring the pressure change on the vacuum side, as exemplified by the German standard DIN51935-2019-07 Carbon Materials Testing—Vacuum Decay Method for Determining Permeability Coefficient Using Air as the Measuring Gas. The second type is for carbon materials with moderate permeability, which can be evaluated by measuring the time it takes for a certain volume of gas to permeate the sample, as exemplified by YS-T 63.10-2012 Test Method for Carbon Materials for Aluminum—Determination of Air Permeability and GB-T 9973-2006 Test Method for Air Permeability of Carbon Materials. For carbon materials with even better permeability, the permeability can be calculated by measuring the flow rate of gas through the sample under a certain pressure difference. However, due to the significant differences in the testing principles and applicable scope of different methods, barrier and non-barrier materials cannot be tested on the same equipment. Even for non-barrier samples, the existing equipment has poor compatibility with low-permeability and high-permeability carbon materials due to limitations in measurement range, sensor accuracy, and other factors. This results in users needing to configure multiple instruments, which not only increases costs but also affects R&D efficiency and data comparability due to equipment switching and inconsistent testing environments. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a fully automatic multifunctional carbon material air permeability testing system.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A fully automatic multifunctional carbon material air permeability testing system includes a vacuum air path, a low-flow air path, a high-flow air path, a four-way pipe, a vent valve, and a sample fixture. The vent valve is sealed and connected to the first port of the four-way pipe, the sample fixture is sealed and connected to the second port of the four-way pipe, the vacuum air path is sealed and connected to the third port of the four-way pipe, and both the low-flow air path and the high-flow air path are sealed and connected to the fourth port of the four-way pipe. The vacuum air path, the low-flow air path, and the high-flow air path are all electrically connected to a control center.

[0007] Furthermore, both the low-flow gas path and the high-flow gas path include a gas delivery pipe, an inlet valve, a pressure transmitter, a flow transmitter, a pressure regulating valve, and a shut-off valve. The output ends of the two gas delivery pipes are respectively sealed and connected to the two inlet ports of the three-way pipe. The output port of the three-way pipe is sealed and connected to the fourth port. The gas delivery pipe is sequentially and sealed with the inlet valve, the pressure regulating valve, the pressure transmitter, the flow transmitter, and the shut-off valve. The shut-off valve is located near the side of the three-way pipe.

[0008] Furthermore, the vacuum circuit includes a vacuum tube, a vacuum stop valve, a vacuum transmitter, a vacuum switch valve, and a vacuum pump. The vacuum tube is sealed and connected to the third pipe port. The vacuum tube is sequentially and sealed with the vacuum stop valve, the vacuum transmitter, the vacuum switch valve, and the vacuum pump. The vacuum stop valve is located near the four-way pipe.

[0009] Furthermore, the sample fixture includes a fixed ring, a movable ring, a locking sleeve, an inner sealing ring, an outer sealing ring, a carbon material plate, and an air supply assembly. The fixed ring has a groove, one end of the movable ring is disposed within the groove, the carbon material plate is disposed between the end of the movable ring and the bottom of the groove, the inner sealing ring is sealed between the bottom of the groove and the carbon material plate, and the outer sealing ring is sealed between the end of the movable ring and the carbon material plate. The movable ring is fixed to the fixed ring by the locking sleeve. A first air passage, cooperating with the carbon material plate, is provided on the upper middle part of the fixed ring. A second air passage, cooperating with the carbon material plate, is provided on the movable ring. The air supply assembly is sealed and connected to the first air passage, and the first air passage is sealed and connected to the second pipe opening.

[0010] Furthermore, an outer limiting ring is sealed and fixedly provided on the outer wall of the movable ring, and an inner limiting ring that cooperates with the outer limiting ring is provided on the inner wall of the locking sleeve, with the inner wall of the inner limiting ring cooperating with the outer wall of the movable ring.

[0011] Furthermore, an inner sealing groove that mates with the inner sealing ring is provided at the bottom of the groove, and an outer sealing groove that mates with the outer sealing ring is provided at the end of the movable ring.

[0012] Furthermore, the fixing ring is provided with an external thread, and the locking sleeve is provided with an internal thread that mates with the external thread.

[0013] Furthermore, the inner sealing ring and the outer sealing ring are coaxially arranged.

[0014] Furthermore, both the inner sealing ring and the outer sealing ring are rubber sealing rings.

[0015] The beneficial effects of this utility model are:

[0016] 1) In this technology, the system performs vacuum decay method and constant pressure high flow rate and low flow rate method tests on carbon materials to realize the function of automatic testing of carbon materials with huge differences in air permeability on the same instrument, thereby improving the detection efficiency and quality control level of carbon material research and development and production.

[0017] 2) This technology has a simple structure, is easy to operate, has a wide range of applications, high measurement accuracy, and high repeatability and reproducibility. It solves the problem that the air permeability performance and measurement standards of different carbon materials cannot be applied on the same instrument.

[0018] 3) In this technology, the carbon material plate is sealed in the middle by an inner sealing ring and an outer sealing ring, and then pressurized and sealed by a fixed ring, a movable ring and a locking sleeve, so that the carbon material plate has good sealing performance during the test, which can measure more accurate values ​​and reduce errors in the test process. At the same time, the structure is simple and easy to disassemble and assemble, which can effectively save test time.

[0019] 4) In this technology, the inner sealing groove and the outer sealing groove are set to facilitate the installation of the inner sealing ring and the outer sealing ring, and to prevent displacement of the inner sealing ring and the outer sealing ring during installation, which could lead to poor sealing during the experiment.

[0020] 5) In this technology, the retaining ring and the locking sleeve are fixed by threads, which facilitates installation and disassembly. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the connection structure of this system;

[0022] Figure 2 This is a schematic diagram of the exploded structure of the sample tooling;

[0023] In the diagram, 1-fixed ring, 2-moving ring, 3-locking sleeve, 4-inner sealing ring, 5-outer sealing ring, 6-carbon material plate, 7-groove, 8-first air passage, 9-second air passage, 10-outer limiting ring, 11-inner limiting ring, 12-inner sealing groove, 13-outer sealing groove, 14-gas supply pipe, 15-inlet valve, 16-pressure transmitter, 17-flow transmitter, 18-exhaust valve, 19-stop valve, 20-pressure regulating valve, 21-vacuum passage, 22-low flow passage, 23-high flow passage, 24-four-way pipe, 25-sample fixture, 26-three-way pipe, 27-vacuum pipe, 28-vacuum stop valve, 29-vacuum transmitter, 30-vacuum switch valve, 31-vacuum pump. Detailed Implementation

[0024] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] See Figures 1-2 This utility model provides a technical solution:

[0026] A fully automatic multifunctional carbon material permeability testing system includes a vacuum air path 21, a low-flow air path 22, a high-flow air path 23, a four-way pipe 24, an exhaust valve 18, and a sample fixture 25. The exhaust valve 18 is sealed and connected to the first port of the four-way pipe 24, the sample fixture 25 is sealed and connected to the second port of the four-way pipe 24, the vacuum air path 21 is sealed and connected to the third port of the four-way pipe 24, the low-flow air path 22 and the high-flow air path 23 are both sealed and connected to the fourth port of the four-way pipe 24, and the vacuum air path 21, the low-flow air path 22 and the high-flow air path 23 are all electrically connected to a control center. In this system, the control center is a conventional technology, and the vent valve 18 is a conventional solenoid valve. The vent valve 18 is electrically connected to the control center. Vacuum path 21, low-flow path 22, and high-flow path 23 represent three different test items. Vacuum path 21 tests performance under vacuum conditions, low-flow path 22 tests performance under low-flow conditions, and high-flow path 23 tests performance under high-flow conditions. Under the control of the control center, only one item from each of these three paths is selected for testing at a time. The sample fixture 25 is used to mount the carbon material to be tested. The vent valve 18 vents air from the system before the experiment is conducted.

[0027] In some embodiments, both the low-flow gas path 22 and the high-flow gas path 23 include a gas delivery pipe 14, an inlet valve 15, a pressure transmitter 16, a flow transmitter 17, a pressure regulating valve 20, and a shut-off valve 19. The output ends of the two gas delivery pipes 14 are respectively sealed and connected to the two inlet ports of the three-way pipe 26, and the output port of the three-way pipe 26 is sealed and connected to the fourth port. The gas delivery pipe 14 is sequentially and sealed with an inlet valve 15, a pressure regulating valve 20, a pressure transmitter 16, a flow transmitter 17, and a shut-off valve 19. The shut-off valve 19 is located near the side of the three-way pipe 26. In this system, the input end of the gas supply pipe 14 is connected to a gas source. The gas from the gas source passes sequentially through the inlet valve 15, pressure regulating valve 20, pressure transmitter 16, flow transmitter 17, and shut-off valve 19 before entering the first ventilation channel 8. The gas then passes through the carbon material plate 6 for testing. Both the pressure transmitter 16 and the flow transmitter 17 are existing technologies. The pressure transmitter 16 and the flow transmitter 17 are used together to measure the air permeability of the carbon material plate 6. The inlet valve 15, pressure regulating valve 20, vent valve 18, and shut-off valve 19 are all existing solenoid valves. The inlet valve 15 controls whether the gas supply pipe 14 receives gas, and the shut-off valve 19 controls whether the gas supply pipe 14 enters the carbon material plate 6. The pressure regulating valve 20 is used to adjust the pressure in the gas supply pipe 14. The inlet valve 15, pressure transmitter 16, flow transmitter 17, pressure regulating valve 20, and shut-off valve 19 are all electrically connected to the control center.

[0028] In some embodiments, the vacuum circuit 21 includes a vacuum tube 27, a vacuum stop valve 28, a vacuum transmitter 29, a vacuum switch valve 30, and a vacuum pump 31. The vacuum tube 27 is sealed and connected to a third port. The vacuum tube 27 is sequentially and sealed with the vacuum stop valve 28, the vacuum transmitter 29, the vacuum switch valve 30, and the vacuum pump 31. The vacuum stop valve 28 is located near the four-way pipe 24. The vacuum pump 31 is a conventional pump used to extract air. The vacuum transmitter 29 is a conventional device used to test the performance of the carbon material plate 6 under vacuum. The vacuum stop valve 28 and the vacuum switch valve 30 are both conventional solenoid valves. The vacuum stop valve 28, the vacuum transmitter 29, the vacuum switch valve 30, and the vacuum pump 31 are all electrically connected to a control center.

[0029] In some embodiments, the sample fixture 25 includes a fixed ring 1, a movable ring 2, a locking sleeve 3, an inner sealing ring 4, an outer sealing ring 5, a carbon material plate 6, and an air supply assembly. The fixed ring 1 has a groove 7, one end of the movable ring 2 is disposed within the groove 7, the carbon material plate 6 is disposed between the end of the movable ring 2 and the bottom of the groove 7, the inner sealing ring 4 is sealed between the bottom of the groove 7 and the carbon material plate 6, and the outer sealing ring 5 is sealed between the end of the movable ring 2 and the carbon material plate 6. The movable ring 2 is fixed to the fixed ring 1 by the locking sleeve 3. A first air passage 8, which mates with the carbon material plate 6, is provided on the upper middle part of the fixed ring 1. A second air passage 9, which mates with the carbon material plate 6, is provided on the movable ring 2. The air supply assembly is sealed and connected to the first air passage 8, and the first air passage 8 is sealed and connected to the second pipe opening. The inner sealing ring 4 and the outer sealing ring 5 are coaxially arranged. Both the inner sealing ring 4 and the outer sealing ring 5 are rubber sealing rings. The fixed ring 1, movable ring 2, and locking sleeve 3 are all made of stainless steel. The first vent 8 on the fixed ring 1 is sealed and connected to the air supply component. The carbon material plate 6 is sandwiched between the inner sealing ring 4 and the outer sealing ring 5 to achieve a seal. The fixed ring 1 and movable ring 2 work together to clamp the inner sealing ring 4 and the outer sealing ring 5. The fixed ring 1 and locking sleeve 3 work together to fix the movable ring 2, the inner sealing ring 4, the outer sealing ring 5, and the carbon material plate 6 inside the space between the fixed ring 1 and the locking sleeve 3. The fixed ring 1, movable ring 2, locking sleeve 3, inner sealing ring 4, outer sealing ring 5, and carbon material plate 6 are all circular and coaxially arranged. The first vent 8 and the second vent 9 have circular cross-sections and are coaxially arranged. The carbon material plate 6 is a carbon product whose air permeability needs to be measured in the experiment.

[0030] In some embodiments, an outer limiting ring 10 is fixedly and sealed on the outer wall of the movable ring 2, and an inner limiting ring 11 that cooperates with the outer limiting ring 10 is provided on the inner wall of the locking sleeve 3. The inner wall of the inner limiting ring 11 cooperates with the outer wall of the movable ring 2. The outer limiting ring 10 and the inner limiting ring 11 cooperate to facilitate the pressing of the end of the movable ring 2 against the outer sealing ring 5, thereby pressing the inner sealing ring 4, the outer sealing ring 5, and the carbon material plate 6 together to achieve a better seal.

[0031] In some embodiments, an inner sealing groove 12 that mates with the inner sealing ring 4 is provided on the bottom of the groove 7, and an outer sealing groove 13 that mates with the outer sealing ring 5 is provided on the end of the movable ring 2. The inner sealing groove 12 and the outer sealing groove 13 facilitate the installation of the inner sealing ring 4 and the outer sealing ring 5, and prevent displacement of the inner sealing ring 4 and the outer sealing ring 5 during installation, which could lead to poor sealing.

[0032] In some embodiments, the retaining ring 1 is provided with an external thread, and the locking sleeve 3 is provided with an internal thread that mates with the external thread. The retaining ring 1 and the locking sleeve 3 are fixed together by threads, which facilitates installation and disassembly.

[0033] In the description of this utility model, it should be understood that the terms "upper", "lower", "bottom", "one end", "top", "middle", "other end", "coaxial", "one side", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "setting", "installation", "connection", "fixing", "hinged" and other such terms should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] The above description is merely a preferred embodiment of this utility model. It should be understood that this utility model is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this utility model should be protected within the scope of the appended claims.

Claims

1. A fully automatic multifunctional carbon material air permeability testing system, characterized in that: It includes a vacuum path (21), a low-flow gas path (22), a high-flow gas path (23), a four-way pipe (24), an exhaust valve (18), and a sample fixture (25). The exhaust valve (18) is sealed and connected to the first port of the four-way pipe (24), the sample fixture (25) is sealed and connected to the second port of the four-way pipe (24), the vacuum path (21) is sealed and connected to the third port of the four-way pipe (24), the low-flow gas path (22) and the high-flow gas path (23) are both sealed and connected to the fourth port of the four-way pipe (24), and the vacuum path (21), the low-flow gas path (22) and the high-flow gas path (23) are all electrically connected to the control center.

2. The fully automatic multifunctional carbon material air permeability testing system according to claim 1, characterized in that: Both the low-flow gas path (22) and the high-flow gas path (23) include a gas delivery pipe (14), an inlet valve (15), a pressure transmitter (16), a flow transmitter (17), a pressure regulating valve (20), and a shut-off valve (19). The output ends of the two gas delivery pipes (14) are respectively sealed and connected to the two inlet ports of the three-way pipe (26). The output port of the three-way pipe (26) is sealed and connected to the fourth port. The inlet valve (15), the pressure regulating valve (20), the pressure transmitter (16), the flow transmitter (17), and the shut-off valve (19) are sequentially sealed and installed on the gas delivery pipe (14). The shut-off valve (19) is installed close to the side of the three-way pipe (26).

3. The fully automatic multifunctional carbon material air permeability testing system according to claim 1 or 2, characterized in that: The vacuum circuit (21) includes a vacuum tube (27), a vacuum stop valve (28), a vacuum transmitter (29), a vacuum switch valve (30), and a vacuum pump (31). The vacuum tube (27) is sealed and connected to the third pipe port. The vacuum tube (27) is sequentially and sealed with the vacuum stop valve (28), the vacuum transmitter (29), the vacuum switch valve (30), and the vacuum pump (31). The vacuum stop valve (28) is located near the four-way pipe (24).

4. A fully automatic multifunctional carbon material air permeability testing system according to claim 1 or 2, characterized in that: The sample fixture (25) includes a fixed ring (1), a movable ring (2), a locking sleeve (3), an inner sealing ring (4), an outer sealing ring (5), a carbon material plate (6), and an air supply assembly. The fixed ring (1) has a groove (7) inside. One end of the movable ring (2) is located within the groove (7). The carbon material plate (6) is positioned between the end of the movable ring (2) and the bottom of the groove (7). The inner sealing ring (4) seals the space between the bottom of the groove (7) and the carbon material plate (6). The outer sealing ring (5)... A sealing ring (5) is sealed between the end of the movable ring (2) and the carbon material plate (6). The movable ring (2) is fixed on the fixed ring (1) by the locking sleeve (3). A first vent (8) that cooperates with the carbon material plate (6) is provided on the middle part of the fixed ring (1). A second vent (9) that cooperates with the carbon material plate (6) is provided on the movable ring (2). The air supply component is sealed and connected to the first vent (8). The first vent (8) is sealed and connected to the second pipe opening.

5. The fully automatic multifunctional carbon material air permeability testing system according to claim 4, characterized in that: An outer limiting ring (10) is fixedly and sealed on the outer wall of the movable ring (2), and an inner limiting ring (11) that cooperates with the outer limiting ring (10) is provided on the inner wall of the locking sleeve (3). The inner wall of the inner limiting ring (11) cooperates with the outer wall of the movable ring (2).

6. The fully automatic multifunctional carbon material air permeability testing system according to claim 4, characterized in that: The bottom of the groove (7) is provided with an inner sealing groove (12) that cooperates with the inner sealing ring (4), and the end of the movable ring (2) is provided with an outer sealing groove (13) that cooperates with the outer sealing ring (5).

7. The fully automatic multifunctional carbon material air permeability testing system according to claim 4, characterized in that: The fixing ring (1) is provided with an external thread, and the locking sleeve (3) is provided with an internal thread that mates with the external thread.

8. The fully automatic multifunctional carbon material air permeability testing system according to claim 4, characterized in that: The inner sealing ring (4) and the outer sealing ring (5) are coaxially arranged.

9. The fully automatic multifunctional carbon material air permeability testing system according to claim 4, characterized in that: Both the inner sealing ring (4) and the outer sealing ring (5) are rubber sealing rings.

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