Graphite pipe permeability detection device

Abstract

The utility model relates to the technical field of permeability detection devices, in particular to a graphite pipe permeability detection device which is used for detecting the permeability of a graphite pipe and comprises a fixing part, a testing part and a workbench, and the fixing part is installed on the workbench and used for fixing the graphite pipe; the testing part comprises a vacuum main pipe, one end of the vacuum main pipe penetrates through the fixing part and the workbench and extends into the graphite pipe, the other end of the vacuum main pipe is connected with a vacuum valve, the vacuum valve is connected with a vacuum pump through a pipeline, the vacuum main pipe is connected with a detection auxiliary pipe and a vacuum breaking auxiliary pipe, and the end of the detection auxiliary pipe is connected with a vacuum gauge pipe. The air breaking auxiliary pipe is connected with an air supplementing auxiliary pipe. The detection device is simple in overall structure and convenient and reliable in use method, the detection control system is used for monitoring and controlling the detection process, the automation degree of the detection device is improved, and the accuracy of the detection result of the detection device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of permeability detection devices, and particularly relates to a graphite pipe permeability detection device. Background Technique

[0002] With the rapid development of the economic society, the world's demand for graphite has been steadily increasing in recent years. At the same time, with the continuous development of technology, the purity of graphite that can be obtained is getting higher and higher, opening up the application of graphite in high-tech fields. The innovation of purification technology has enabled graphite to have a wider application in fields such as carbon composite materials, the electronics industry, friction materials, and lubrication. The flexible graphite industry has good market prospects. The extensive application of a large number of fuel cells has increased the consumption of graphite. Therefore, the development of high-quality graphite is of great significance for the development of technology.

[0003] In the prior art, the detection of the permeability of graphite by a graphite permeability detection device still has problems such as insufficient accuracy and a cumbersome detection process. Content of the Utility Model

[0004] In view of the above problems, the utility model provides a graphite pipe permeability detection device to solve the problems of insufficient accuracy and a cumbersome detection process in the detection of graphite permeability by the detection device in the prior art.

[0005] To achieve the above object, the utility model provides a graphite pipe permeability detection device for detecting the permeability of graphite pipes. The detection device includes a fixing part, a testing part, and a workbench. The fixing part is installed on the workbench, and the fixing part is used to fix the graphite pipes.

[0006] The testing part includes a main vacuum pipe. One end of the main vacuum pipe passes through the fixing part and the workbench and extends into the graphite pipe. The other end of the main vacuum pipe is connected to a vacuum valve. The vacuum valve is connected to a vacuum pump through a pipeline. A detection sub-pipe and a venting sub-pipe are connected to the main vacuum pipe. The end of the detection sub-pipe is connected to a vacuum gauge tube, and a gas supplement sub-pipe is connected to the venting sub-pipe.

[0007] Further, a venting valve is provided at the end of the venting sub-pipe, a micro-hole air release valve is provided on the gas supplement sub-pipe, and a gas supplement valve is connected to the end of the gas supplement sub-pipe.

[0008] Further, the fixing part includes a bracket, a cylinder, an upper pressing plate and a lower backing plate. The bracket is installed on the workbench. The cylinder is vertically installed on the bracket. The output end of the cylinder is connected with the upper pressing plate. The lower backing plate is installed on the workbench and is arranged below the upper pressing plate. The graphite pipe is clamped between the upper pressing plate and the lower backing plate. One end of the main vacuum pipe passes through the workbench and the lower backing plate and extends into the graphite pipe.

[0009] Further, fluororubber pads are arranged on the contact surfaces of the upper pressing plate and the lower backing plate with the graphite pipe. Silicone grease is smeared on the surface of the fluororubber pads for auxiliary sealing.

[0010] Further, the vacuum valve, the air-breaking valve and the air-complementing valve all adopt high-vacuum baffle valves.

[0011] Further, the detection device is also provided with a detection control system. The cylinder, the vacuum valve, the air-breaking valve, the air-complementing valve, the micro-orifice air-release valve, the vacuum gauge tube and the vacuum pump are all electrically connected to the detection control system.

[0012] Advantages of the present utility model:

[0013] The overall structure of the present utility model is simple, and the usage method is convenient and reliable. The detection control system is used to monitor and control the detection process, which is beneficial to improving the automation degree of the detection device and the accuracy of the detection result of the detection device.

[0014] The present utility model uses a cylinder to control the upper pressing plate for clamping the graphite pipe, which is beneficial to ensuring the clamping force of the detection device, ensuring the airtightness of the detection device and improving the reliability of the detection result.

[0015] The present utility model uses a vacuum gauge tube to monitor the pressure in the device in real time and feeds back the pressure condition in the device in real time through the detection control system. Through the detection control system, the permeability coefficient can be quickly calculated according to the relationship between pressure and time, which greatly improves the detection efficiency of permeability. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions of the present utility model, the drawings required for use in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is the overall structure diagram of the device;

[0018] Among them, 1 - fixing part, 11 - bracket, 12 - cylinder, 13 - upper pressing plate, 14 - lower backing plate, 2 - testing part, 201 - main vacuum pipe, 202 - vacuum valve, 203 - vacuum pump, 204 - detection sub - pipe, 205 - vacuum gauge tube, 206 - air - breaking sub - pipe, 207 - air - breaking valve, 208 - air - supplementing sub - pipe, 209 - micro - pore air - bleeding valve, 210 - air - supplementing valve, 3 - workbench, 4 - graphite pipe. Specific embodiments

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0020] In a specific embodiment of the present invention, as Figure 1 shown, a graphite pipe permeability detection device for detecting the permeability of the graphite pipe 4, characterized in that the detection device includes a fixing part 1, a testing part 2 and a workbench 3. The fixing part 1 is installed on the workbench 3, and the fixing part 1 is used to fix the graphite pipe 4;

[0021] The fixing part 1 includes a bracket 11, a cylinder 12, an upper pressing plate 13 and a lower backing plate 14. The bracket 11 is installed on the workbench 3, the cylinder 12 is vertically installed on the bracket 11, the output end of the cylinder 12 is connected with the upper pressing plate 13, the lower backing plate 14 is installed on the workbench 3 and is arranged below the upper pressing plate 13. The graphite pipe 4 is clamped between the upper pressing plate 13 and the lower backing plate 14. Fluororubber gaskets are arranged on the contact surfaces of the upper pressing plate 13 and the lower backing plate 14 with the graphite pipe 4, and silicone grease is smeared on the surface of the fluororubber gaskets for auxiliary sealing.

[0022] The testing part 2 includes a main vacuum pipe 201. One end of the main vacuum pipe 201 passes through the workbench 3 and the lower backing plate 14 and extends into the graphite pipe 4. The other end of the main vacuum pipe 201 is connected with a vacuum valve 202. The vacuum valve 202 is connected with a vacuum pump 203 through a pipeline. A detection sub - pipe 204 and an air - breaking sub - pipe 206 are connected to the main vacuum pipe 201. The end of the detection sub - pipe 204 is connected with a vacuum gauge tube 205. An air - supplementing sub - pipe 208 is connected to the air - breaking sub - pipe 206. An air - breaking valve 207 is arranged at the end of the air - breaking sub - pipe 206. A micro - pore air - bleeding valve 209 is arranged on the air - supplementing sub - pipe 208. The end of the air - supplementing sub - pipe 208 is connected with an air - supplementing valve 210.

[0023] The vacuum valve 202, the air - breaking valve 207 and the air - supplementing valve 210 all adopt high - vacuum baffle valves.

[0024] The detection device is also provided with a detection control system. The cylinder 12, vacuum valve 202, air breaking valve 207, air supplementing valve 210, micro-hole air release valve 209, vacuum gauge 205 and vacuum pump 203 are all electrically connected to the detection control system.

[0025] The usage process of the present utility model:

[0026] The detection control system includes a manual mode and an automatic mode. Before detection, the basic parameters of the graphite pipe 4 to be detected are input into the detection control system, including the sample number, name, types of impregnants used in sample production and impregnation times, and the basic parameters of the test are set, including the inner diameter, outer diameter, length, volume, pipeline volume, ambient humidity, air pressure, vacuum degree, vacuum pumping time, static waiting time, waiting not yet time, test recording time, etc.;

[0027] During the device sealing test process, the stainless-steel pipe is placed between the upper pressing plate 13 and the lower backing plate 14. Fluororubber gaskets are provided on the upper pressing plate 13 and the lower backing plate 14, and silicone grease is applied on the fluororubber gaskets to increase the sealing performance. The cylinder 12 is used to push the upper pressing plate 13 downward to ensure no air leakage. The vacuum valve 202 is opened, and the vacuum pump 203 is started. After vacuum pumping, the vacuum valve 202 and the vacuum pump 203 are closed. After standing for a period of time, it is judged whether the device sealing degree meets the test requirements according to the rebound value of the pressure during the standing time. If the pressure change value is greater than 10 Pa, it indicates that there is a sealing problem with the device. If the pressure change value is less than 10 Pa, it indicates that the device meets the test requirements and subsequent operations can be carried out;

[0028] During the test process, the stainless-steel pipe is replaced with the graphite pipe 4 and placed between the upper pressing plate 13 and the lower backing plate 14. Fluororubber gaskets are provided on the upper pressing plate 13 and the lower backing plate 14, and silicone grease is applied on the fluororubber gaskets to increase the sealing performance. The cylinder 12 is used to push the upper pressing plate 13 downward to ensure no air leakage. The vacuum valve 202 is opened, and the vacuum pump 203 is started. After vacuum pumping, the vacuum valve 202 and the vacuum pump 203 are closed. After standing for a period of time, if the pressure does not reach 90 Pa after standing, the air supplementing valve 210 is opened, and the micro-hole air release valve 209 is used to slowly supplement air into the device to make the pressure reach about 90 Pa. The micro-hole air release valve 209 is closed, and the pressure in the graphite tube gradually rises to 100 Pa. The test time is started to be recorded, and the detection control system automatically generates a correlation curve of pressure and time until the set detection duration or the set detection pressure is reached. The permeability coefficient can be calculated according to the correlation curve of pressure and time;

[0029] The calculation formula of the permeability coefficient is:

[0030]

[0031] Where: k - permeability coefficient, mm 2 / s,

[0032] L, d i , d o - Sample length, inner diameter, outer diameter, mm,

[0033] △t - Test duration, s,

[0034] V - Inner volume of the detection device, including the inner volume of the sample and the inner volume of the pipeline, mm 3 ,

[0035] △P i - During the test period, the change value of the pressure inside the sample, Pa, △P i =P i2 - P i1 , P i1 - Pressure value at the starting time point, P i2 - Pressure value at the ending time point;

[0036] - Average pressure difference, Pa, P a - Local atmospheric pressure, - Average pressure inside the sample,

[0037] After the test is completed, open the air release valve 207, the pressure inside the device rises, and lift the upper pressing plate 13 to remove the graphite pipe 4.

[0038] For each of the preferred and optional technical means disclosed in the present utility model, except as specifically stated or when one preferred or preferably applicable technical means is a further limitation of another technical means, they can be arbitrarily combined to form several different technical solutions. Therefore, equivalent changes made according to the claims still fall within the scope covered by the present utility model.

Claims

1. A graphite tube permeability detection device for detecting the permeability of a graphite tube (4), characterized in that: The detection device comprises a fixing part (1), a testing part (2) and a workbench (3), wherein the fixing part (1) is installed on the workbench (3), and the fixing part (1) is used to fix the graphite tube (4); The testing part (2) comprises a vacuum main pipe (201), one end of the vacuum main pipe (201) passes through the fixing part (1) and the workbench (3) and extends into the graphite tube (4), the other end of the vacuum main pipe (201) is connected to a vacuum valve (202), the vacuum valve (202) is connected to a vacuum pump (203) via a pipeline, the vacuum main pipe (201) is connected to a detection sub-pipe (204) and a vacuum-breaking sub-pipe (206), the end of the detection sub-pipe (204) is connected to a vacuum gauge (205), and the vacuum-breaking sub-pipe (206) is connected to a gas-supplying sub-pipe (208).

2. A graphite tube permeability detection device according to claim 1, characterized in that: The end of the air-breaking auxiliary pipe (206) is provided with an air-breaking valve (207), the air-supplementing auxiliary pipe (208) is provided with a microporous air-releasing valve (209), and the end of the air-supplementing auxiliary pipe (208) is connected to an air-supplementing valve (210).

3. A graphite tube permeability detection device according to claim 2, characterized in that: The fixing part (1) comprises a bracket (11), a cylinder (12), an upper pressure plate (13) and a lower pad (14); the bracket (11) is mounted on the workbench (3); the cylinder (12) is vertically mounted on the bracket (11); the output end of the cylinder (12) is connected to the upper pressure plate (13); the lower pad (14) is mounted on the workbench (3) and arranged below the upper pressure plate (13); the graphite tube (4) is clamped between the upper pressure plate (13) and the lower pad (14); one end of the vacuum main pipe (201) passes through the workbench (3) and the lower pad (14) and extends into the graphite tube (4).

4. A graphite tube permeability detection device according to claim 3, characterized in that: Fluorine rubber pads are provided on the contact surfaces of the upper pressure plate (13), the lower pad (14) and the graphite tube (4), and silicone grease is applied on the surface of the fluorine rubber pads to assist in sealing.

5. A graphite tube permeability detection device according to claim 2, characterized in that: The vacuum valve (202), the air-breaking valve (207) and the air-supplementing valve (210) are all high-vacuum baffle valves.

6. A graphite tube permeability detection device according to claim 3, characterized in that: The detection device is also provided with a detection control system, and the cylinder (12), the vacuum valve (202), the air-breaking valve (207), the air-supplementing valve (210), the microporous air-release valve (209), the vacuum gauge (205) and the vacuum pump (203) are all electrically connected to the detection control system.

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