Device for measuring air permeability of porous carbon material

Abstract

The utility model provides a porous carbon material air permeability measuring device, which solves the problems of poor porous carbon material detection effect and the like, and comprises a detection cylinder body, a sealing ring is arranged in the middle of the detection cylinder body, the interior of the detection cylinder body is divided into an upper cavity and a lower cavity by the sealing ring, and a separation net is arranged in the sealing ring. A sealing pressing assembly is arranged at the upper end of the sealing ring, an air guide pipe for communicating the upper cavity and the lower cavity is installed on the outer side of the detection barrel and provided with a stop valve, the lower cavity is connected with a vacuum pump through a pressure extraction pipe, the upper cavity is communicated with an air storage tank through an air inlet pipe and an air inlet pump, and the pressure extraction pipe is communicated with the air storage tank through a recovery pump and a recovery pipe. And an air pressure sensor is arranged in the detection cylinder. The device has the advantages of good detection effect, stable structure and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of porous carbon material detection equipment, and particularly relates to a device for measuring the air permeability of porous carbon materials. Background Art

[0002] The permeability of gas to materials is one of the important items in the detection of material physical properties. Materials with low permeability have a certain barrier effect on gas. Among these materials, materials with extremely low gas permeability are also called barrier materials and are widely used as functional materials. However, the existing detection equipment lacks effective means for detecting the air permeability of porous carbon materials, and it is impossible to ensure the sealing performance during the detection process, resulting in large detection errors.

[0003] In order to solve the deficiencies of the existing technology, people have carried out long-term explorations and proposed various solutions. For example, a Chinese patent document discloses a device for detecting the air permeability of fabrics [202011427299.0], which includes a detection box, a fan, a winding roller, an unwinding roller, multiple test tubes, a bracket and a sphere. The test tubes are vertically arranged on the top of the detection box. The test tubes have first through grooves, and brackets are arranged at the bottoms of the first through grooves. The sphere is arranged on the top of the bracket. Second through grooves are also provided on the test tubes, and a marking component is arranged in the second through grooves. The marking component includes an imprinting block, a pull rod, a spring and a first limiting block. The imprinting block is arranged at the bottom of the second through groove, and a dye is arranged on the lower surface of the imprinting block. The upper end of the pull rod extends out from the upper end of the second through groove. The spring is sleeved on the pull rod, and the first limiting block is arranged above the spring. A second limiting block is arranged on the side wall of the second through groove below the spring.

[0004] The above solution solves the problem of fabric air permeability detection to a certain extent, but there are still many deficiencies in this solution, such as poor detection effect for porous carbon materials. Summary of the Invention

[0005] The purpose of the utility model is to provide a device for measuring the air permeability of porous carbon materials with reasonable design and good detection effect for the air permeability of porous carbon materials in view of the above problems.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme: A device for measuring the air permeability of porous carbon materials includes a detection cylinder body. A sealing ring is arranged in the middle of the detection cylinder body. The sealing ring divides the interior of the detection cylinder body into an upper cavity and a lower cavity. An isolation net is installed in the sealing ring. A sealing and pressing component is arranged at the upper end of the sealing ring. A gas guide pipe that communicates the upper cavity and the lower cavity is installed outside the detection cylinder body. The gas guide pipe is equipped with a stop valve. The lower cavity is connected to a vacuum pump through a suction and pressure pipe. The upper cavity is communicated with a gas storage tank through an air inlet pipe and an air inlet pump. The suction and pressure pipe is connected to the gas storage tank through a recovery pump and a recovery pipe. A barometric pressure sensor is arranged inside the detection cylinder body.

[0007] In the above-mentioned air permeability measuring device for a porous carbon material, the detection cylinder body is inserted and fixed on the detection platform. The detection platform has several detection stations corresponding to the detection cylinder body one by one. The upper end of the detection cylinder body is closed by a sealing cover, and a locking assembly is arranged between the lower end of the detection cylinder body and the detection station.

[0008] In the above-mentioned air permeability measuring device for a porous carbon material, the locking assembly includes a locking groove arranged in a ring shape at the upper end of the detection station. The lower end of the detection cylinder body is provided with a flanging and locking edges arranged at equal distances up and down. A locking strip made of an elastic material is installed inside the locking groove. An expansion cavity is arranged inside the locking strip and the expansion cavity is connected to an air charging pump.

[0009] In the above-mentioned air permeability measuring device for a porous carbon material, the sealing cover is threadedly connected to the detection cylinder body. A sealing ring that fits each other is installed between the top of the sealing cover and the top of the detection cylinder body. The air guide pipe is communicated with the sealing cover.

[0010] In the above-mentioned air permeability measuring device for a porous carbon material, the sealing ring is integrally formed with the detection cylinder body, and the sealing ring and the detection cylinder body are made of a transparent material.

[0011] In the above-mentioned air permeability measuring device for a porous carbon material, the sealing and pressing assembly includes a sealing plate installed on the sealing ring. An isolation net is arranged at the center of the sealing plate. A backing plate is connected above the sealing plate through a support column. Vent holes are evenly distributed on the backing plate, and an air permeable gap is left between the backing plate and the sealing plate.

[0012] In the above-mentioned air permeability measuring device for a porous carbon material, a limiting pressing plate is installed in the upper cavity, and a fixing assembly is arranged between the limiting pressing plate and the detection cylinder body.

[0013] In the above-mentioned air permeability measuring device for a porous carbon material, the fixing assembly includes a fixing cylinder distributed along the circumference of the limiting pressing plate and fitting with the inner wall of the detection cylinder body. The lower end of the limiting pressing plate is connected with a fixing frame, and the lower end of the fixing frame contacts and presses the sealing and pressing assembly.

[0014] In the above-mentioned air permeability measuring device for a porous carbon material, the fixing frame includes several fixing strips that are centrosymmetrically arranged. The fixing strips are made of an elastic material. The fixing strips are connected to the limiting pressing plate and a buckle for adjusting the tension of the fixing strips is arranged between them.

[0015] In the above-mentioned air permeability measuring device for a porous carbon material, a pressure sensor is installed between the fixing assembly and the sealing and pressing assembly.

[0016] Compared with the existing technologies, the advantages of the present utility model are as follows: The detection cylinder body is internally provided with a sealing and pressing assembly to ensure the sealing of the porous carbon material, and the air permeability of the carbon material is accurately detected by detecting the air pressure changes in the upper and lower cavities; Multiple detection stations are arranged on the detection platform, and multiple groups of carbon materials can be detected at one time, thereby reducing the detection error; The porous carbon material is limited by a fixing assembly inside the detection cylinder body, and the rapid replacement of the carbon material can be completed. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of the present utility model;

[0018] Figure 2 is a structural sectional view of the present utility model;

[0019] Figure 3 is a partial sectional view of the present utility model;

[0020] Figure 4 is a structural block diagram of the present utility model;

[0021] In the figure, detection cylinder body 1, sealing ring 11, upper cavity 12, lower cavity 13, isolation net 14, sealing and pressing assembly 2, sealing plate 21, support column 22, backing plate 23, air permeation holes 24, air permeation gap 25, air guide pipe 3, stop valve 31, suction and pressure pipe 4, vacuum pump 41, air inlet pipe 5, air inlet pump 51, gas storage tank 52, recovery pump 6, recovery pipe 61, detection platform 7, detection station 71, sealing cover 72, flanging 73, locking edge 74, locking strip 75, expansion cavity 76, inflation pump 77, sealing ring 78, limiting pressing plate 8, fixing cylinder 81, fixing frame 82, fixing strip 83, lock catch 84. Detailed Description of the Preferred Embodiment

[0022] The present utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0023] As Figures 1-4As shown in the figure, a device for measuring the air permeability of a porous carbon material includes a vertically arranged detection cylinder body 1. A sealing ring 11 is arranged in the middle of the detection cylinder body 1 to limit the filled porous carbon material. The sealing ring 11 divides the interior of the detection cylinder body 1 into an upper cavity 12 and a lower cavity 13. When performing air permeability detection, the carbon material is placed in the upper cavity 12. An isolation net 14 is installed inside the sealing ring 11 to reduce the influence on air permeability. A sealing and pressing assembly 2 is arranged at the upper end of the sealing ring 11 to improve its sealing effect and avoid air leakage at the edge, which affects the detection accuracy. An air guide pipe 3 that connects the upper cavity 12 and the lower cavity 13 is installed outside the detection cylinder body 1. The air guide pipe 3 is equipped with a stop valve 31. The lower cavity 13 is connected to a vacuum pump 41 through a suction and pressure pipe 4. The upper cavity 12 is connected to a gas storage tank 52 through an air inlet pipe 5 and an air inlet pump 51. The suction and pressure pipe 4 is connected to the gas storage tank 52 through a recovery pump 6 and a recovery pipe 61. A pressure sensor is arranged inside the detection cylinder body 1. During use, the inside of the detection cylinder body 1 is subjected to vacuum treatment, and then gas is introduced into the upper cavity 12. The pressure sensors in the upper cavity 12 and the lower cavity 13 detect the pressure change to judge the air intake volume of the lower cavity 13 per unit time, so as to realize the detection of the air permeability of the porous carbon material.

[0024] Specifically, the whole detection cylinder body 1 is detachable. Under normal conditions, it is plugged and fixed on a detection platform 7. The detection platform 7 has a number of detection stations 71 corresponding to the detection cylinder body 1 one by one to realize synchronous detection of multiple batches of carbon materials. The upper end of the detection cylinder body 1 is closed by a sealing cover 72. A locking assembly is arranged between the lower end of the detection cylinder body 1 and the detection station 71 to prevent it from detaching after being fixed, and at the same time ensure the airtightness of the lower end of the detection cylinder body 1.

[0025] In-depth, different from the conventional locking structure, the locking assembly in this application adopts pneumatic locking. Specifically, it includes a locking groove arranged in a ring shape at the upper end of the detection station 71. The lower end of the detection cylinder body 1 is provided with a flanging 73 and locking edges 74 arranged equidistantly up and down. A locking strip 75 made of elastic material is installed inside the locking groove 73. An expansion cavity 76 is arranged inside the locking strip 75, and the expansion cavity 76 is connected to an inflation pump 77. The locking strip 75 is inflated and expanded, and its outer side is attached and extruded with the flanging 73 and the locking edges 74 to deform. Multiple stepped surfaces ensure the airtightness at the joint and prevent the lower end of the detection cylinder body 1 from detaching.

[0026] Further, the sealing cover 72 and the detection cylinder body 1 adopt a conventional threaded connection method. A sealing ring 78 that fits with each other is installed between the top of the sealing cover 72 and the top of the detection cylinder body 1. The air guide pipe 3 is connected to the sealing cover 72. The sealing ring 78 is embedded in a groove body. When the sealing cover 72 is rotated to a specified position, the sealing ring 78 is extruded and deformed accordingly.

[0027] Even further, for the convenience of observation, the sealing ring 11 and the detection cylinder body 1 are integrally formed, and the sealing ring 11 and the detection cylinder body 1 are made of transparent materials. A stepped surface that fits with the cylindrical porous carbon material is formed between the sealing ring 11 and the detection cylinder body 1.

[0028] In addition, since a gas flow channel is left in the center of the sealing ring 11, the sealing and pressing assembly 2 includes a sealing plate 21 installed on the sealing ring 11. The isolation net 14 is arranged in the center of the sealing plate 21. Above the sealing plate 21, a backing plate 23 is connected through a support column 22. Vent holes 24 are evenly distributed on the backing plate 23, and a ventilation gap 25 is left between the backing plate 23 and the sealing plate 21. The backing plate 23 contacts the lower end of the carbon material, and the ventilation gap 25 and the isolation net 14 ensure that gas flow is not affected.

[0029] At the same time, the porous carbon material usually adopts a column structure. A limiting pressure plate 8 is installed in the upper cavity 12 and connected to the top of the carbon material. A fixing assembly is arranged between the limiting pressure plate 8 and the detection cylinder 1 to limit the lower end of the carbon material, ensuring stable connection between the carbon material and the limiting pressure plate 8.

[0030] Visibly, the fixing assembly includes a fixing cylinder 81 distributed circumferentially along the limiting pressure plate 8 and fitting with the inner wall of the detection cylinder 1. A fixing frame 82 is connected to the lower end of the limiting pressure plate 8, and the lower end of the fixing frame 82 contacts and presses the sealing and pressing assembly 2. The porous carbon material is quickly transferred as a whole through the limiting pressure plate 8 and the fixing cylinder 81. At the same time, this structure restricts the specifications of the carbon material itself, ensures the matching effect with the detection cylinder 1, and thus improves the detection accuracy.

[0031] Obviously, the fixing frame 82 includes several fixing bars 83 that are centrosymmetric. The fixing bars 83 are made of an elastic material. The fixing bars 83 are connected to the limiting pressure plate 8, and a buckle 84 for adjusting the tension of the fixing bars 83 is arranged between them. Manually pull the fixing bars 83 to make the fixing bars 83 tighten and fit with the outer side of the carbon material. After the buckle 84 is unlocked, the carbon material can be taken out from the fixing bars 83.

[0032] Preferably, a pressure sensor is installed between the fixing assembly and the sealing and pressing assembly 2 to detect whether the carbon material is in place and verify the quality of the carbon material at the same time.

[0033] In summary, the principle of this embodiment is that the inside of the detection cylinder 1 is divided into an upper cavity 12 and a lower cavity 13 by a sealing ring 11. The porous carbon material is filled in the upper cavity 12. After the inside of the detection cylinder 1 is evacuated, gas is introduced, and the air permeability of the porous carbon material is accurately detected by detecting the pressure difference and the change amount of air pressure between the upper and lower cavities.

[0034] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0035] Although terms such as detection cylinder body 1, sealing ring 11, upper cavity 12, lower cavity 13, isolation net 14, sealing and pressing assembly 2, sealing plate 21, support column 22, backing plate 23, air vent hole 24, air vent gap 25, air guide pipe 3, stop valve 31, suction and pressure pipe 4, vacuum pump 41, air inlet pipe 5, air inlet pump 51, gas storage tank 52, recovery pump 6, recovery pipe 61, detection platform 7, detection station 71, sealing cover 72, flanging 73, locking edge 74, locking strip 75, expansion cavity 76, inflation pump 77, sealing ring 78, limit pressing plate 8, fixed cylinder 81, fixing frame 82, fixing strip 83, lock catch 84 are used more frequently in this text, the possibility of using other terms is not excluded. These terms are only used to more conveniently describe and explain the essence of the present utility model; interpreting them as any kind of additional limitation is contrary to the spirit of the present utility model.

Claims

1. A porous carbon material permeability measurement device, comprising a detection cylinder (1), wherein a sealing ring (11) is arranged in the middle of the detection cylinder (1), and the sealing ring (11) divides the interior of the detection cylinder (1) into an upper cavity (12) and a lower cavity (13), wherein: An isolation net (14) is installed inside the sealing ring (11), and a sealing and clamping assembly (2) is arranged at the upper end of the sealing ring (11). An air guide pipe (3) connecting the upper cavity (12) and the lower cavity (13) is installed on the outer side of the detection cylinder (1), and the air guide pipe (3) is equipped with a stop valve (31). The lower cavity (13) is connected to a vacuum pump (41) through a suction pipe (4), and the upper cavity (12) is connected to an air storage tank (52) through an air intake pipe (5) and an air intake pump (51). The suction pipe (4) is connected to the air storage tank (52) through a recovery pump (6) and a recovery pipe (61), and the detection cylinder (1) has a built-in air pressure sensor.

2. A porous carbon material permeability measurement device according to claim 1, characterized in that: The detection cylinder (1) is plugged and fixed on the detection platform (7), and the detection platform (7) has a plurality of detection stations (71) corresponding to the detection cylinders (1) one by one. The upper end of the detection cylinder (1) is closed by a sealing cover (72), and a locking assembly is provided between the lower end of the detection cylinder (1) and the detection stations (71).

3. A porous carbon material permeability measuring device according to claim 2, characterized in that: The locking assembly comprises a ring-shaped locking groove arranged at the upper end of the detection station (71); the lower end of the detection cylinder (1) is provided with a flange (73) and locking edges (74) arranged equidistantly above and below; a locking strip (75) made of elastic material is installed on the inner side of the locking groove; an expansion chamber (76) is arranged inside the locking strip (75), and the expansion chamber (76) is connected to an air pump (77).

4. A porous carbon material permeability measurement device according to claim 2, characterized in that: The sealing cover (72) is threadedly connected to the detection cylinder (1), a sealing ring (78) is installed between the top of the sealing cover (72) and the top of the detection cylinder (1), and the air guide tube (3) is connected to the sealing cover (72).

5. The porous carbon material permeability measuring device according to claim 1, characterized in that: The sealing ring (11) and the detection cylinder (1) are integrally formed, and the sealing ring (11) and the detection cylinder (1) are made of transparent material.

6. A porous carbon material permeability measurement device according to claim 5, characterized in that: The sealing and clamping assembly (2) comprises a sealing plate (21) mounted on a sealing ring (11), the isolation net (14) is arranged at the center of the sealing plate (21), a pad (23) is connected above the sealing plate (21) via a support column (22), air holes (24) are evenly distributed on the pad (23), and an air permeable gap (25) is left between the pad (23) and the sealing plate (21).

7. The porous carbon material air permeability measuring device according to claim 1, characterized in that: A limit pressure plate (8) is installed in the upper cavity (12), and a fixing component is arranged between the limit pressure plate (8) and the detection cylinder (1).

8. The porous carbon material permeability measuring device according to claim 7, characterized in that: The fixing assembly comprises a fixing cylinder (81) distributed along the circumference of the limiting pressure plate (8) and in contact with the inner wall of the detection cylinder (1); the lower end of the limiting pressure plate (8) is connected to a fixing frame (82); the lower end of the fixing frame (82) is in contact with and pressed against the sealing and clamping assembly (2).

9. A porous carbon material permeability measurement device according to claim 8, characterized in that: The fixing frame (82) comprises a plurality of fixing strips (83) which are centrally symmetrical. The fixing strips (83) are made of elastic material. The fixing strips (83) are connected to the limiting pressure plate (8) and a lock (84) for adjusting the tension of the fixing strips (83) is arranged therebetween.

10. The porous carbon material permeability measuring device according to claim 7, characterized in that: A pressure sensor is installed between the fixing component and the sealing and pressing component (2).

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