Porous graphite air permeability detection device

Abstract

The embodiment of the utility model provides a porous graphite air permeability detection device. The porous graphite air permeability detection device comprises a detection assembly and a control assembly, the detection assembly comprises an air inlet part, a detection part and an air outlet part; wherein the air inlet part and the air outlet part are respectively arranged on two sides of the detection part; a detection cavity is formed in the detection part, a mounting position is arranged in the detection cavity, and the porous graphite is arranged at the mounting position; an air inlet cavity is formed in the air inlet part, an air inlet and a plurality of air inlet holes which are communicated with the air inlet cavity are formed in the two ends of the air inlet cavity respectively, and the air inlet holes are opposite to the air inlet side of the porous graphite; an air outlet cavity is formed in the air outlet part, the two ends of the air outlet cavity are provided with an air outlet communicated with the air outlet cavity and a plurality of air outlet holes respectively, and the air outlet holes are opposite to the air outlet side of the porous graphite; the control assembly comprises a controller and pressure sensors, the pressure sensors are arranged on the two sides of the installation position, and the pressure sensors are electrically connected with the controller.

Description

Technical Field

[0001] This application relates to the field of porous graphite air permeability testing technology, and in particular to a porous graphite air permeability testing device. Background Technology

[0002] Porous graphite is a porous material made from graphite. It possesses many unique physical and chemical properties, making it promising for a wide range of applications. Various methods exist for preparing porous graphite, such as chemical vapor deposition, electrochemical deposition, pyrolysis of hydrocarbons, and chemical reaction foaming, allowing for control of pore size and distribution. The pore size and distribution of porous graphite significantly influence its mechanical strength, gas separation and adsorption properties, semiconductor manufacturing, gas permeability, processing performance, and pore structure.

[0003] In related technologies, a gas permeability tester is used to test the air permeability of porous graphite. The gas permeability tester has a sealed test chamber. Porous graphite is placed in the test chamber, and the porous graphite can divide the test chamber into an inlet chamber and an outlet chamber. Gas flows out sequentially through the inlet chamber, the porous graphite and the outlet chamber to test the air permeability of the porous graphite.

[0004] However, since the air intake and exhaust in the air intake and exhaust chambers are both input through pipes, it takes a long time for the pressure difference on both sides of the porous graphite to reach a constant value, and it is easy to cause uneven pressure difference on both sides of the porous graphite, which leads to errors in the test data. Utility Model Content

[0005] This application provides a porous graphite air permeability testing device to solve the technical problem in related technologies where the air intake and exhaust are both input through pipes, which easily leads to unstable pressure difference between the air intake and exhaust chambers, resulting in errors in the test data.

[0006] This application provides a porous graphite air permeability testing device, including: a testing component and a control component;

[0007] The detection assembly includes an air inlet, a detection section, and an air outlet; wherein the air inlet and the air outlet are respectively located on both sides of the detection section;

[0008] The detection section has a detection cavity, and a mounting position is provided inside the detection cavity, with porous graphite disposed at the mounting position;

[0009] The air intake section has an air intake chamber, and the two ends of the air intake chamber are respectively provided with an air intake port and multiple air intake holes that connect to the air intake chamber. The multiple air intake holes and the air intake side of the porous graphite are arranged opposite to each other.

[0010] The air outlet section has an air outlet chamber, and the two ends of the air outlet chamber are respectively provided with an air outlet and multiple air outlet holes that connect to the air outlet chamber. The multiple air outlet holes and the air outlet side of the porous graphite are arranged opposite to each other.

[0011] The control components include a controller and a pressure sensor. The pressure sensor is located on both sides of the mounting position and is electrically connected to the controller. The controller is configured to receive the pressure value signal output by the pressure sensor and calculate the air permeability of the porous graphite based on the pressure value signal.

[0012] In one feasible implementation, the inner wall diameter of the air intake chamber gradually increases from the air intake port toward the mounting position;

[0013] The diameter of the inner wall of the air outlet gradually increases from the air outlet towards the installation position.

[0014] In one feasible implementation, a heating wire is provided inside the air intake chamber to heat the gas inside the air intake chamber;

[0015] The detection device also includes temperature sensors, which are located on both sides of the mounting position and are electrically connected to the controller to output temperature signals to the controller.

[0016] In one feasible implementation, the detection device further includes a scanning element disposed on the sidewall of the air outlet facing the porous graphite.

[0017] The scanner and controller are electrically connected. The scanner is configured to scan the pores on the surface of porous graphite to output pore distribution data of porous graphite to the controller.

[0018] In one feasible implementation, the air outlet is provided with a movable track facing the sidewall of the porous graphite, and the movable track includes a first track and a second track arranged in a cross configuration.

[0019] The first track is set along the length direction of the porous graphite, and the second track is set along the width direction of the porous graphite. The first track and the second track are set perpendicular to each other through the center of the side wall of the air outlet.

[0020] The scanned document is set by sliding along the movable track.

[0021] In one feasible implementation, the air intake and air outlet are detachably mounted by bolts;

[0022] Furthermore, a detection section is formed between the air intake and air outlet sections.

[0023] In one feasible implementation, the detection device further includes a sealing ring disposed between the inner wall of the detection chamber and the porous graphite.

[0024] This application provides a porous graphite air permeability testing device. This embodiment features an air inlet chamber with multiple air inlets positioned opposite the air inlet side of the porous graphite. During air intake, gas is evenly introduced towards the air inlet side of the porous graphite through these air inlets, allowing for rapid and uniform diffusion of the gas. Furthermore, this embodiment also features an air outlet chamber with multiple air outlets positioned opposite the air outlet side of the porous graphite. When a vacuum pump extracts gas, the gas is evenly extracted through these multiple air outlets, creating a relatively uniform pressure difference across the porous graphite. This results in a stable pressure difference between the air inlet and outlet chambers, improving the accuracy of the test data. Through the design of this embodiment, a porous graphite air permeability testing device with improved test data accuracy is provided. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0026] Figure 1 This is a partial structural schematic diagram of a porous graphite air permeability testing device provided in one embodiment of this application;

[0027] Figure 2 This is a structural framework diagram of a porous graphite air permeability testing device provided in one embodiment of this application;

[0028] Figure 3 yes Figure 1 A partial structural diagram of the central air outlet.

[0029] Explanation of reference numerals in the attached figures:

[0030] 100 - Detection component; 200 - Controller; 300 - Scanner; 400 - Bolt; 500 - Sealing ring; 600 - Porous graphite; 700 - Vacuum pump;

[0031] 110 - Air inlet; 111 - Air inlet port; 112 - Air inlet chamber; 113 - Air inlet hole; 114 - Heating wire; 120 - Detection section; 121 - Detection chamber; 130 - Air outlet; 131 - Air outlet port; 132 - Air outlet chamber; 133 - Air outlet hole; 134 - First track; 135 - Second track; 210 - Pressure sensor; 220 - Temperature sensor. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of this application.

[0033] It should be noted that many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0034] In the description of this application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. In this application, unless otherwise expressly specified and limited, the first feature being "upper" or "lower" than the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium.

[0035] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; 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. However, specifying a direct connection indicates that the two entities connected are not linked by an intermediate structure, but are simply connected to form a whole. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0036] In this application, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0037] Porous graphite is a porous material made from graphite. It possesses many unique physical and chemical properties, making it promising for a wide range of applications. Various methods exist for preparing porous graphite, such as chemical vapor deposition, electrochemical deposition, pyrolysis of hydrocarbons, and chemical reaction foaming, allowing for control of pore size and distribution. The pore size and distribution of porous graphite significantly influence its mechanical strength, gas separation and adsorption properties, semiconductor manufacturing, gas permeability, processing performance, and pore structure.

[0038] In related technologies, a gas permeability tester is used to test the air permeability of porous graphite. The gas permeability tester has a sealed test chamber. Porous graphite is placed in the test chamber, and the porous graphite can divide the test chamber into an inlet chamber and an outlet chamber. Gas flows out sequentially through the inlet chamber, the porous graphite and the outlet chamber to test the air permeability of the porous graphite.

[0039] However, since the air intake and exhaust are both supplied through pipes, the pressure difference between the intake and exhaust chambers is prone to instability, which can lead to errors in the test data.

[0040] Therefore, this application provides a porous graphite air permeability testing device to solve the technical problem in the related art that, since the air inlet and outlet chambers are both input through pipes, the pressure difference between the air inlet and outlet chambers is easily unstable, resulting in errors in the test data.

[0041] Figure 1 This is a partial structural schematic diagram of a porous graphite air permeability testing device provided in one embodiment of this application; Figure 2 This is a structural framework diagram of a porous graphite air permeability testing device provided in one embodiment of this application.

[0042] Reference Figure 1 and Figure 2 This application provides a porous graphite air permeability testing device, including: a testing component 100 and a control component;

[0043] The detection assembly 100 includes an air inlet 110, a detection section 120, and an air outlet 130; wherein the air inlet 110 and the air outlet 130 are respectively disposed on both sides of the detection section 120.

[0044] The detection section 120 has a detection cavity 121, and a mounting position is provided inside the detection cavity 121, where the porous graphite 600 is disposed;

[0045] The air intake section 110 has an air intake chamber 112. At both ends of the air intake chamber 112, there are air intake ports 111 and multiple air intake holes 113 that communicate with the air intake chamber 112. The multiple air intake holes 113 are arranged opposite to the air intake side of the porous graphite 600.

[0046] The air outlet 130 has an air outlet cavity 132. At both ends of the air outlet cavity 132, there are air outlets 131 and multiple air outlet holes 133 that communicate with the air outlet cavity 132. The multiple air outlet holes 133 are arranged opposite to the air outlet side of the porous graphite 600.

[0047] The control component includes a controller 200 and a pressure sensor 210. The pressure sensor 210 is disposed on both sides of the mounting position. The pressure sensor 210 and the controller 200 are electrically connected. The controller 200 is configured to receive the pressure value signal output by the pressure sensor 210 and calculate the air permeability of the porous graphite 600 based on the pressure value signal.

[0048] For example, both highly permeable porous graphite 600 and low-permeability porous graphite 600 can be tested.

[0049] In practical implementation, the outlet 131 of the outlet chamber 132 is usually connected to the vacuum pump 700. Gas enters the inlet chamber 112 through the inlet 111 and then flows out through the outlet chamber 132 and the outlet 131 of the outlet chamber 132 in sequence. For example, the controller 200 is also connected to the vacuum pump 700. The controller 200 can control the flow rate of the vacuum pump 700 according to the pressure signal measured by the pressure sensor 210, thereby adjusting the pressure difference in the detection chamber 121.

[0050] It should be noted that the porous graphite 600 divides the detection cavity 121 into two parts. The first part is the first detection cavity 121 formed between the air inlet side of the porous graphite 600 and the air inlet section 110, and the second part is the second detection cavity 121 formed between the air outlet side of the porous graphite 600 and the air outlet section 130.

[0051] In actual use, the air inlet 111 is closed, the vacuum pump 700 is turned on, and the vacuum pump 700 is used to evacuate the detection chamber 121 to a low vacuum state. Then, the air inlet 111 is opened, and gas is injected into the air inlet 111 at a certain pressure. The gas enters the air inlet chamber 112 through the air inlet 111, and then is evenly distributed into the first detection chamber 121 through multiple air inlets 113. The gas enters the second detection chamber 121 through the pores of the porous graphite 600 through the first detection chamber 121, and then is output through the second detection chamber 121, multiple air outlets 133, and the air outlet chamber 132.

[0052] After a pressure difference is established across the porous graphite 600, gas molecules will move from the high-pressure side to the low-pressure side, that is, from the inlet side to the outlet side of the porous graphite 600. This is because gas molecules have the characteristic of diffusing from high-concentration areas to low-concentration areas, and the existence of the pressure difference provides the driving force for the movement of gas molecules. Gas molecules will permeate from the high-pressure side to the low-pressure side through channels such as pores or micropores in the sample.

[0053] Pressure sensor 210 monitors the pressure change on the outlet side in real time. Based on the pressure change and relevant parameters, the gas permeability of the test gas is calculated using a formula, thereby calculating the permeability rate. The calculation formula is as follows:

[0054]

[0055] Among them, V C The volume of porous graphite 600 on the vent side is T; the test temperature (thermodynamic temperature) is P. u dp / dt is the pressure on the inlet side of porous graphite 600; A is the effective permeation area; dp / dt is the change in pressure per unit time on the outlet side after the permeation state temperature; R is the gas constant.

[0056] From the above description, it can be seen that this solution achieves the following technical effects:

[0057] This embodiment of the application, through the configuration of an air inlet chamber 112 with multiple air inlet holes 113 opposite to the air inlet side of the porous graphite 600, allows for uniform air intake towards the air inlet side of the porous graphite 600 during the air intake process, enabling rapid and uniform diffusion of gas to the air inlet side of the porous graphite 600. Furthermore, this embodiment of the application, through the configuration of an air outlet chamber 132 with multiple air outlet holes 133 opposite to the air outlet side of the porous graphite 600, allows for uniform gas extraction through the multiple air outlet holes 133 when the vacuum pump 700 extracts gas, creating a relatively uniform pressure difference across the porous graphite 600. This results in a stable pressure difference between the air inlet chamber 112 and the air outlet chamber 132, improving the accuracy of the test data. Through the configuration of this embodiment of the application, a porous graphite 600 air permeability testing device that improves the accuracy of test data is provided.

[0058] In some examples, the inner wall diameter of the air intake chamber 112 gradually increases from the air intake port 111 toward the mounting position;

[0059] The inner diameter of the air outlet chamber 132 gradually increases from the air outlet 131 toward the installation position.

[0060] In this embodiment, the inner wall diameter of the air inlet chamber 112 is set to gradually increase from the air inlet 111 towards the mounting position, and the inner wall diameter of the air outlet chamber 132 is set to gradually increase from the air outlet 131 towards the mounting position. When the gas diffuses from the air inlet 111 towards the air inlet 113, the gas can be uniformly diffused through the inner wall of the air inlet chamber 112. Similarly, when the vacuum pump 700 extracts the gas in the detection chamber 121, the vacuum pump 700 can uniformly diffuse the gas through multiple air outlets 133 and the inner wall of the air outlet chamber 132 in sequence, so as to keep the pressure difference on both sides of the porous graphite 600 stable.

[0061] For example, a heating wire 114 is provided in the air intake chamber 112 for heating the gas in the air intake chamber 112;

[0062] The detection device also includes a temperature sensor 220, which is disposed on both sides of the mounting position and is electrically connected to the controller 200 to output a temperature signal to the controller 200.

[0063] It should be noted that the air permeability of porous graphite 600 varies at different temperatures.

[0064] For example, a heating wire 114 may also be provided in the air outlet chamber 132 to heat the porous graphite 600 in the detection chamber 121.

[0065] In this embodiment, the heating wire 114 heats the gas in the air inlet chamber 112, allowing the heated gas to enter the detection chamber 121 and heat the porous graphite 600. Simultaneously, the heating wire 114 also heats the detection chamber 121, further heating the porous graphite 600 to detect its permeability at different temperatures. Furthermore, this embodiment utilizes a temperature sensor 220 to detect the real-time temperature of the porous graphite 600.

[0066] For example, the detection device also includes a scanning element 300, which is disposed on the sidewall of the air outlet 130 facing the porous graphite 600.

[0067] The scanner 300 is electrically connected to the controller 200. The scanner 300 is configured to scan the pores on the surface of the porous graphite 600 to output the pore distribution data of the porous graphite 600 to the controller 200.

[0068] For example, scan 300 can be set as a mapping scanner.

[0069] In this embodiment, the scanning element 300 is configured to scan the distribution of pores on the surface of the porous graphite 600. By electrically connecting the scanning element 300 and the controller 200, the scanning element 300 sends the pore distribution data of the porous graphite 600 to the controller 200, so that the controller 200 can analyze the pore distribution data of the porous graphite 600.

[0070] Figure 3 yes Figure 1 A partial structural diagram of the central air outlet.

[0071] Reference Figure 3 For example, the air outlet 130 is provided with a movable track on the side wall facing the porous graphite 600, and the movable track includes a first track 134 and a second track 135 arranged in a cross configuration.

[0072] The first track 134 is arranged along the length direction of the porous graphite 600, and the second track 135 is arranged along the width direction of the porous graphite 600. The first track 134 and the second track 135 are arranged perpendicular to each other through the center of the side wall of the air outlet 130.

[0073] The scanned document 300 is set to slide along the movable track.

[0074] In this embodiment, the first track 134 and the second track 135 are arranged, with the first track 134 arranged along the width direction of the porous graphite 600. The first track 134 and the second track 135 are arranged perpendicularly to each other through the center of the side wall of the air outlet 130, and the scanning element 300 is slidably arranged along the movable track, so that the scanning element 300 can move laterally and longitudinally along the porous graphite 600 to perform omnidirectional scanning of the porous graphite 600.

[0075] For example, the air intake 110 and the air outlet 130 are detachably mounted by bolts 400;

[0076] Furthermore, a detection section 120 is formed between the air intake section 110 and the air outlet section 130.

[0077] In this embodiment, the air outlet 130 and the air inlet 110 are detachably provided by bolts 400, and the air inlet 110 and the air outlet 130 form a detection part 120, thereby facilitating the disassembly and installation of the porous graphite 600 for testing.

[0078] In another implementation, the detection device also includes a sealing ring 500, which is disposed between the inner wall of the detection cavity 121 and the porous graphite 600.

[0079] The embodiment of this application improves the sealing performance of the detection cavity 121 by setting the sealing ring 500, thereby further improving the accuracy of the air permeability detection of porous graphite 600.

[0080] It is readily understood that, based on the several embodiments provided in this application, those skilled in the art can combine, split, or reorganize the embodiments of this application to obtain other embodiments, none of which exceed the protection scope of this application.

[0081] The above detailed embodiments further illustrate the purpose, technical solution, and beneficial effects of the embodiments of this application. It should be understood that the above are merely specific embodiments of the embodiments of this application and are not intended to limit the protection scope of the embodiments of this application. Any modifications, equivalent substitutions, improvements, etc., made on the basis of the technical solutions of the embodiments of this application should be included within the protection scope of the embodiments of this application.

Claims

1. A porous graphite air permeability detection device, characterized by, The application relates to a detection device for porous graphite. The device comprises a detection assembly and a control assembly. The detection assembly comprises an air inlet part, a detection part and an air outlet part. The detection part is provided with a detection cavity. The air inlet part is provided with an air inlet cavity. The air outlet part is provided with an air outlet cavity. The control assembly comprises a controller and a pressure sensor.

2. The porous graphite air permeability detection device according to claim 1, characterized in that, The pressure sensor is arranged on both sides of the mounting position. The pressure sensor and the controller are electrically connected.

3. The porous graphite air permeability detection device according to claim 1, characterized in that, The controller is configured to receive a pressure value signal output by the pressure sensor and calculate the air permeability of the porous graphite according to the pressure value signal. The inner wall diameter of the air inlet cavity gradually increases from the air inlet to the mounting position.

4. The porous graphite air permeability detection device according to any one of claims 1-3, characterized in that, The inner wall diameter of the air outlet cavity gradually increases from the air outlet to the mounting position. The air inlet cavity is provided with a heating wire for heating the gas in the air inlet cavity.

5. The porous graphite air permeability detection device according to claim 4, characterized in that, The detection device further comprises a temperature sensor arranged on both sides of the mounting position. The temperature sensor and the controller are electrically connected to output a temperature signal to the controller. The detection device further comprises a scanning piece arranged on the side wall of the air outlet part facing the porous graphite.

6. The porous graphite air permeability detection device according to any one of claims 1-3, characterized in that, The scanning piece and the controller are electrically connected. The scanning piece is configured to scan the air permeation holes on the surface of the porous graphite and output air permeation hole distribution data of the porous graphite to the controller.

7. The porous graphite air permeability detection device according to any one of claims 1-3, characterized in that, The side wall of the air outlet part facing the porous graphite is provided with a movable track. The movable track comprises a first track and a second track arranged in a cross shape. The first track is arranged along the length direction of the porous graphite. The second track is arranged along the width direction of the porous graphite. The first track and the second track are arranged perpendicularly through the center of the side wall of the air outlet part. The scanning piece is arranged to slide along the movable track. The air inlet part and the air outlet part are detachably arranged by bolts. The detection part is formed between the air inlet part and the air outlet part. The detection device further comprises a sealing ring arranged between the inner wall of the detection cavity and the porous graphite.

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