Multifunctional air permeability measuring equipment for measuring air permeability of tubular vent pipe

Abstract

Multifunctional air permeability measuring equipment for measuring the air permeability of a tubular vent pipe comprises an air permeability measuring instrument, a tubular measuring head arranged on the air permeability measuring instrument, a gas conveying device externally connected with the air permeability measuring instrument, and a plane filter membrane, and the tubular test head is externally connected with a tubular vent pipe of which the air permeability is to be tested. The air permeability tester comprises a gas circuit device, and the gas circuit device comprises a first gas valve, a second gas valve connected with the first gas valve and used for controlling on-off of a tubular test gas switch, and a tubular test interface connected with the second gas valve and used for transmitting gas to the tubular test head. According to the utility model, through the special design of the gas circuit device, the gas conveyed by the gas conveying device flows through the gas pump, the flow sensor and the tubular test interface and finally flows into the tubular vent pipe, so that the gas permeability of the tubular vent pipe is tested.

Description

Technical Field

[0001] This utility model belongs to the technical field of air permeability measuring devices, and in particular, it is a multifunctional air permeability measuring device for measuring the air permeability of tubular air-permeable tubes. Background Technology

[0002] Traditionally, most filter membranes used in the market are paper-based, which have good air permeability and can be tested using traditional air permeability meters. However, with the development of domestic chip technology, a tubular honeycomb-shaped air permeable tube is now used in 12-inch wafer cells. This tube not only combines the filtration function of traditional filter membranes but also helps to evenly disperse the gas passing through its structure, making it highly practical.

[0003] However, existing air permeability testers only measure the air permeability of planar filter membranes and cannot measure the air permeability of tubular filter membranes. Therefore, it is impossible to judge the performance of tubular air permeable tube products and to inspect the quality of the products. Summary of the Invention

[0004] In view of this, the present invention provides a multifunctional air permeability measuring device for measuring the air permeability of tubular air-permeable tubes, in order to solve the above problems.

[0005] A multifunctional air permeability measuring device for measuring the air permeability of a tubular permeable tube includes an air permeability measuring instrument, a tubular test head disposed on the air permeability measuring instrument, a gas delivery device externally connected to the multifunctional air permeability measuring device for supplying gas to the air permeability measuring instrument, and a planar filter membrane with the air permeability to be measured disposed on the air permeability measuring instrument. A tubular permeable tube with the air permeability to be measured is externally connected to the tubular test head. The air permeability measuring instrument includes a support for the air permeability measuring device. The apparatus includes a permeability measuring instrument body, a planar test head mounted on the permeability measuring instrument body for testing the permeability of the planar filter membrane, a cylinder assembly mounted on the permeability measuring instrument body for fixing the planar filter membrane, and an air passage device disposed inside the permeability measuring instrument body for gas flow. The planar test head includes a first planar support mounted on the permeability measuring instrument body for supporting the planar filter membrane. The first planar support includes a first planar support base for supporting the planar filter membrane, and a... A first gas through-hole for gas flow is formed on the first planar support base. The gas path device includes a cylinder through-hole connected to the gas delivery device, an air pump disposed in the body of the permeability measuring instrument and connected to the gas delivery device, a vent valve connected to the air pump for adjusting gas pressure, a pressure sensor connected to the air pump for measuring the gas pressure passing through the air pump, a flow sensor connected to the pressure sensor for measuring the gas flow rate passing through the air pump, a first air valve connected to the air pump flow sensor for controlling the on / off of the gas switch, a sheet-like test interface connected to the first air valve for supplying gas to the first gas through-hole, a second air valve connected to the first air valve for controlling the on / off of the tubular test gas switch, and a tubular test interface connected to the second air valve for supplying gas to the tubular test head. After the gas flows through the gas path pipe and is pressurized by the air pump, it flows successively through the pressure sensor, the flow sensor, the first air valve, and the second air valve, and finally flows out from the tubular test interface to measure the permeability of the tubular permeable tube.

[0006] Furthermore, the air permeability tester also includes a first control device disposed on the air permeability tester body for controlling the switch of the air permeability tester, a second control device disposed on the air permeability tester body for controlling the mode selection of the air permeability tester, a printing device disposed on the air permeability tester body for printing out the test data results, a pressure regulating component disposed on the air permeability tester body for adjusting the internal gas pressure of the air permeability tester, and an air inlet disposed on the air permeability tester body for the gas delivered by the gas delivery device to pass through.

[0007] Furthermore, the planar test head includes a second planar support that is spaced apart from the first planar support and connected to the cylinder assembly.

[0008] Furthermore, the first planar support is a cylinder, and the first planar support is fixed on the air permeability measuring instrument body. The first gas through hole is connected to the interior of the air permeability measuring instrument body to form an air passage.

[0009] Furthermore, the second planar support includes a second planar support base spaced apart from the first planar support base, a shaft located between the second planar support base and the cylinder assembly, and a second gas through hole opened on the second planar support base facing the first planar support base. The second planar support is a cylinder, and the axes of the second planar support and the first planar support are located on the same straight line.

[0010] Furthermore, the cylinder assembly includes a cylinder bracket disposed on the permeability body, a cylinder disposed on the cylinder bracket, and at least one gas delivery pipe connecting the cylinder bracket and the cylinder.

[0011] Furthermore, the cylinder support includes at least one cylinder support disposed on the permeability body, a cylinder support plate disposed on the cylinder support for supporting the cylinder, and a support through hole opened inside the cylinder support for the gas delivery pipe to pass through.

[0012] Furthermore, the tubular test head includes a tubular test head body disposed on the air permeability measuring instrument body and used to support the tubular air permeable tube, a top groove formed on the side of the tubular test head body facing the tubular air permeable tube for abutting the tubular air permeable tube, and a through hole formed on the tubular test head body for supplying air to the tubular air permeable tube.

[0013] Furthermore, the tubular vent is a tube closed at one end, and the radius of the tubular vent is larger than the radius of the through hole.

[0014] Compared with the prior art, the multifunctional air permeability measuring device for measuring the air permeability of tubular air-permeable tubes provided by this utility model, through the tubular test head opened on the air permeability measuring instrument for cooperating with the tubular air-permeable tube to test the air permeability of the tubular air-permeable tube, and the special design of the air path device, allows the gas delivered by the gas delivery device to flow through the air pump, the pressure sensor, the flow sensor and the tubular test interface in sequence, and finally flow into the tubular air-permeable tube from the through hole, thereby testing the air permeability of the tubular air-permeable tube. Attached Figure Description

[0015] Figure 1 A schematic diagram of the structure of the multifunctional air permeability measuring device for measuring the air permeability of tubular air-permeable tubes provided by this utility model.

[0016] Figure 2 for Figure 1 A schematic diagram of a planar test head and cylinder assembly structure in one direction.

[0017] Figure 3 for Figure 2 A schematic diagram of the planar test head and cylinder assembly structure in another direction.

[0018] Figure 4 A schematic diagram of the flow path structure of the gas path device for measuring the air permeability of a multifunctional air permeability measuring device for measuring the air permeability of a tubular air permeable tube provided by this utility model.

[0019] Figure 5 for Figure 1 Schematic diagram of the voltage regulating component

[0020] Figure 6 for Figure 1 A schematic diagram showing the exploded structure of the tubular test head and tubular test tube. Detailed Implementation

[0021] The specific embodiments of this utility model are described in further detail below. It should be understood that the description of the embodiments of this utility model herein is not intended to limit the scope of protection of this utility model.

[0022] like Figures 1 to 6As shown, this is a multifunctional air permeability measuring device for measuring the air permeability of a tubular air-permeable tube, provided by this utility model. The device includes an air permeability measuring instrument 10 and a tubular test head 20 mounted on the instrument 10. An external gas delivery device 30 for supplying gas to the instrument 10 is connected to the device, along with a planar filter membrane 40 whose air permeability is to be measured, mounted on the instrument 10. A tubular air-permeable tube 50 with the air permeability to be measured is connected to the tubular test head 20 for operation in conjunction with the device. The device also includes other functional modules, such as a power control device connected to the air permeability measuring instrument, which are well-known to those skilled in the art and will not be described in detail here.

[0023] The air permeability measuring instrument 10 includes an instrument body 11 for supporting the air permeability measuring device, a planar test head 12 disposed on the instrument body 11 for testing the air permeability of the planar filter membrane 40, a cylinder assembly 13 disposed on the instrument body 11 for fixing the planar filter membrane 40, an air passage device 14 disposed inside the instrument body 11 for gas flow, and a first cylinder assembly disposed on the instrument body 11 for controlling the switching of the air permeability measuring instrument 10. The instrument includes a control device 15, a second control device 16 mounted on the air permeability tester body 11 for controlling the mode selection of the air permeability tester 10, a printing device 17 mounted on the air permeability tester body 11 for printing out test data results, a pressure regulating component 18 also mounted on the air permeability tester body 11 for adjusting the internal gas pressure of the air permeability tester 10, and an air inlet 19 located on the air permeability tester body 11 for the gas supplied by the gas delivery device 30 to pass through. The air permeability tester 10 is used to measure the air permeability of a product and includes two test modes: a sheet test mode and a tubular test mode.

[0024] The air permeability measuring instrument body 11 can be a rectangular shell, with the shell surface used to support the air permeability measuring equipment. Preferably, the air permeability measuring instrument body 11 is made of metal materials such as iron, thereby having better stability.

[0025] The planar test head 12 is used to test the air permeability of the planar filter membrane 40. The planar test head 12 includes a first planar support 121 disposed on the air permeability measuring instrument body 11 and used to support the planar filter membrane 40, and a second planar support 122 disposed at a distance from the first planar support 121 and connected to the cylinder assembly 13.

[0026] The first planar support 121 includes a first planar support base 1211 for supporting the planar filter membrane 40, and a first gas through hole 1212 formed on the first planar support base 1211 for gas flow. The first planar support 121 can be a cylinder. The first gas through hole 1212 can be a circular through hole. The first planar support 121 is fixed to the air permeability measuring instrument body 11, and the first gas through hole 1212 communicates with the interior of the air permeability measuring instrument body 11 to form an air passage.

[0027] The second planar support 122 is used in conjunction with the first planar support 121 to test the air permeability of the planar filter membrane 40. The specific working principle of this conjunction will be described below in conjunction with the cylinder assembly 13. The second planar support 122 can also be a cylinder. Preferably, the second planar support 122 has the same structure as the first planar support 121, and the axes of the second planar support 122 and the first planar support 121 are located on the same straight line. The second planar support 122 includes a second planar support base 1221 spaced apart from the first planar support base 1211, a shaft 1222 located between the second planar support base 1221 and the cylinder assembly 13, and a second gas through hole 1223 opened on the second planar support base 1212 facing the first planar support base 1211.

[0028] One end of the shaft 1222 is connected to the second planar support base 1221, and the other end is connected to the cylinder assembly 13. The shaft 1222 can extend and retract along the axial direction under the action of the cylinder assembly 13. Its specific working principle will be described in conjunction with the cylinder assembly 13 below.

[0029] The second gas through-hole 1223 can also be a circular through-hole. Preferably, the first gas through-hole 1212 and the second gas through-hole 1223 have the same structure, and the axes of the first gas through-hole 1212 and the second gas through-hole 1223 are on the same straight line.

[0030] The cylinder assembly 13 includes a cylinder bracket 131 disposed on the air permeability body 11, a cylinder 132 disposed on the cylinder bracket 131, and at least one gas delivery pipe 133 connecting the cylinder bracket 131 and the cylinder 132.

[0031] The cylinder support 131 is used to support the cylinder 132. The cylinder support 131 includes at least one cylinder strut 1311 disposed on the permeability body 11 for supporting the cylinder support plate 1312 described below, a cylinder support plate 1312 disposed on the cylinder strut 1311 for supporting the cylinder 132, and a strut through hole 1313 formed inside the cylinder strut 1311 for the gas delivery pipe 133 to pass through.

[0032] The cylinder support 1311 can be a cylinder. Preferably, the cylinder support 1311 is made of metal materials such as iron, so as to have better support.

[0033] The cylinder support plate 1312 can be a rectangular plate. Preferably, the cylinder support plate 1312 is made of metal materials such as iron, so as to have better load-bearing capacity.

[0034] The number of cylinder support 1311 and gas delivery pipe 133 corresponds one-to-one. In this embodiment, there are two cylinder support 1311 and two gas delivery pipes 133.

[0035] The cylinder 132 is connected to the shaft 1222 and is used to control the movement of the shaft 1222 along the axis. The cylinder 132 is a pneumatic actuator that converts the pressure energy in compressed air into mechanical energy, which is existing technology and will not be described in detail here. The gas delivered by the gas delivery device 30 passes through the gas path device 14 and then flows into the cylinder 132 through the gas delivery pipe 133. The cylinder 132 starts working after the gas is input. At this time, the piston inside the cylinder 132 pushes the shaft 1222 to move axially toward the first planar support 121 until the second planar support 122 abuts against the first planar support 121. At this time, the planar filter membrane 40 is clamped by the second planar support 122 and the first planar support 121, thereby fixing the planar filter membrane 40. The gas delivered by the gas delivery device 30 flows through the first gas through hole 1212 and passes through the planar filter membrane 40 to test the air permeability of the planar filter membrane 40.

[0036] The gas delivery pipe 133 is used to transport the gas delivered by the gas delivery device 30.

[0037] The gas path device 14 includes a cylinder through-hole 141 connected to the gas delivery device 30, an air pump 142 disposed inside the air permeability measuring instrument body 11 and connected to the gas delivery device 30, a vent valve 143 connected to the air pump 142 for adjusting gas pressure, a pressure sensor 144 connected to the air pump 142 for measuring the gas pressure passing through the air pump 142, a flow sensor 145 connected to the pressure sensor 144 for measuring the gas flow rate passing through the air pump 142, a first air valve 146 connected to the air pump flow sensor 145 for controlling the on / off of the gas switch, a sheet-like test interface 147 connected to the first air valve 146 for supplying air to the first gas through-hole 1212, a second air valve 148 connected to the first air valve 146 for controlling the on / off of the tubular test gas switch, and a tubular test interface 149 connected to the second air valve 148 for supplying air to the tubular test head 20. Obviously, the various components in the aforementioned air circuit device 14 are connected by air circuit pipes, which is well known to those skilled in the art and will not be described in detail here.

[0038] The cylinder through hole 141 is a through hole that penetrates the surface of the housing of the air permeability measuring instrument body 11, and is used to install the gas delivery pipe 133.

[0039] The air pump 142 is used to pressurize the gas delivered by the gas delivery device 30 according to the actual measurement needs. This is well known to those skilled in the art and will not be described in detail here.

[0040] The vent valve 143 is used to appropriately release the excessive pressure of the gas after it has been pressurized by the air pump 142, so that the gas pressure meets the test requirements. This is well known to those skilled in the art and will not be described in detail here.

[0041] The first control device 15 is used to control the working state of the air permeability measuring instrument 10, such as starting and stopping the device. The first control device 15 can be a switch button.

[0042] The second control device 16 is used to select the test mode of the air permeability tester 10 and to adjust the gas flow rate and gas pressure in the gas path device 14. The second control device 16 can be a touch screen. The second control device 16 obviously includes an actuator, which can be used to select the test mode of the air permeability tester 10 and to adjust the gas flow rate and pressure in the gas path device 14. This is well known to those skilled in the art and will not be described in detail here.

[0043] When the sheet test mode is selected, the planar filter membrane 40 is first placed between the first planar support 121 and the second planar support 122. The gas delivery device 30 supplies gas to the gas path device 14 through the air inlet 29. At this time, the first air valve 146 is open and the second air valve 148 is closed. The gas first flows out from the cylinder through-hole 141 through the gas path pipe, and the gas delivery pipe 133 passing through the cylinder through-hole 141 sends the gas delivered by the gas delivery device 30 into the cylinder 132. At this time, the cylinder 132 starts to work after the gas input, so that the piston inside the cylinder 132 drives the shaft 1222 to move towards the first planar support 121 until the first planar support 121 abuts against the second planar support 122. At this time, the planar filter membrane 40 located between the first planar support 121 and the second planar support 122 is clamped and fixed. After being pressurized by the air pump 142, the gas flows successively through the pressure sensor 145, the flow sensor 145, and the first air valve 146, finally exiting from the sheet-shaped test interface 147. The gas is blown onto the planar filter membrane 40 through the first gas through-hole 1212, which communicates with the sheet-shaped test interface 147. The gas pressure on the side of the planar filter membrane 40 facing the second gas through-hole 1223 is standard atmospheric pressure, while the gas pressure on the side of the planar filter membrane 40 facing the first gas through-hole 1212 is high-pressure gas after being pressurized by the air pump 142. The pressure and flow rates of the gas flowing through the planar filter membrane 40 are statistically measured by the pressure sensor 144 and the flow sensor 145. The gas pressure difference across the planar filter membrane 40 is calculated, and thus the air permeability of the planar filter membrane 40 is calculated. This is a prior art technique and will not be elaborated further here.

[0044] When the tubular test mode is selected, the tubular vent tube 50 is first inserted into the tubular test head 20, and the planar filter membrane 40 is then placed on the first planar support 121, covering the first gas passage 1212. Similar to the sheet test mode described above, the gas delivered by the gas delivery device 30 first supplies gas to the cylinder 132 through the cylinder passage 141 until the planar filter membrane 40 is clamped and fixed by the first planar support 121 and the second planar support 122. The gas delivery device 30 supplies gas to the gas path device 14 through the air inlet 19. At this time, the first air valve 146 and the second air valve 148 are open. After the gas flows through the gas path tube and is pressurized by the air pump 142, it flows successively through the pressure sensor 144, the flow sensor 145, the first air valve 146, and the second air valve 148, finally exiting from the tubular test interface 149. Due to the opening of the first gas valve 144, some gas will flow out through the sheet-like test interface 147. However, since the planar filter membrane 40 is pre-covered on the first gas passage 1212, and the planar filter membrane 40 is clamped and fixed by the first planar support 121 and the second planar support 122, a relatively sealed space is formed between the three. At this time, the amount of gas flowing out from the first gas passage 1212 is small and will not have a significant impact on the test. At this time, the gas pressure outside the tubular vent tube 50 is standard atmospheric pressure, and the gas pressure inside the tube is high-pressure gas pressure after being pressurized by the air pump 142. It can be expected that the gas pressure inside the tubular vent tube 50 is greater than the gas pressure outside the tube. There are two test methods for the tubular test mode. One method is to compare the permeability of the tubular vent 50 by controlling the gas flow rate delivered by the gas path device 14 and comparing the different gas pressure differences inside and outside the tubular vent 50. When the gas flow rate through the tubular vent 50 is constant, a larger gas pressure difference indicates that, under the same gas flow rate, a higher internal pressure is required for gas to flow through the tubular vent 50 and out, indicating poorer permeability of the tubular vent 50. Another method is to control the pressure of the gas path device 14 and compare the permeability of the tubular vent 50 by comparing the gas flow rate input through the gas delivery device 30. When the gas pressure inside the tubular vent 50 is constant, a larger gas flow rate delivered by the gas delivery device 30 indicates that more gas flows through the tubular vent 50 and out, indicating better permeability of the tubular vent 50.

[0045] The pressure regulating component 18 includes a pressure regulating valve 181 disposed on the air permeability measuring instrument body 11 for controlling the gas pressure in the gas path device 14, and a pressure gauge 182 for observing the gas pressure in the gas path device 14. It is conceivable that the pressure regulating component 18 and the air pump 142 are connected via a gas path pipe. During use, the pressure regulating valve 181 can control the gas pressure applied by the air pump 142, and the pressure gauge 182 can read the gas pressure value after pressurization by the air pump 142. The tubular test head 20 includes a tubular test head body 21 disposed on the air permeability measuring instrument body 11 for supporting the tubular vent tube 50, a top groove 22 formed on the side of the tubular test head body 21 facing the tubular vent tube 50 for abutting against the tubular vent tube 50, and a through hole 23 formed on the tubular test head body 21 for supplying air to the tubular vent tube 50.

[0046] The tubular test head body 21 is a cylindrical shape. Preferably, the tubular test head body 21 is made of metal materials such as iron, thereby having better load-bearing capacity.

[0047] The abutment groove 22 can be a circular groove, and the abutment groove 22 is used to abut against the tubular vent pipe 50.

[0048] The through-hole 23 can be a circular through-hole through which the gas delivered by the gas delivery device 30 flows to the tubular vent pipe 50. The radius of the through-hole 23 is smaller than the radius of the top groove 22. Preferably, the axis of the through-hole 23 and the axis of the top groove 22 are on the same straight line. The through-hole 23 communicates with the interior of the air permeability measuring instrument body 11 to form an air passage.

[0049] The gas delivery device 30 is a gas supply device used to input a certain quantity and pressure of gas into the permeability measuring instrument 10 as needed. The gas delivery device 30 can be a gas source, which is existing technology and will not be described in detail here. Preferably, since this embodiment requires gas to be supplied to the cylinder 132, and the normal bearing pressure of the cylinder 132 is 0.3 to 0.8 MPa, the gas input by the gas delivery device 30 should be within this range. The high-pressure gas required for subsequent testing can be pressurized by the gas pump 142.

[0050] The planar filter membrane 40 is made by deposition or stretching of polymer materials and is commonly used in industrial and research fields. In this embodiment, the planar filter membrane 40 used is a paper-like filter membrane such as carbon paper, which is well known to those skilled in the art and will not be described in detail here.

[0051] The tubular vent 50 is a tube closed at one end. The radius of the tubular vent 50 is larger than the radius of the through hole 23. If the radius of the tubular vent 50 is smaller than the radius of the through hole 23, a gap will exist between the tubular vent 50 and the through hole 23, and gas will escape from the gap, thus affecting the test results. Preferably, the radius of the tubular vent 50 is approximately the same as the radius of the top groove 22, so that the tubular vent 50 can fit tightly against the top groove 22 after placement, with no gap between them. This ensures that during the ventilation test, the tubular vent 50 will not be impacted by the gas and shake from side to side, affecting the accuracy of the test results. The surface of the tubular vent 50 has a honeycomb permeable structure, which has good air permeability, allowing gas to pass through the vent 50 and escape from the inside of the tube to the outside.

[0052] Compared with the prior art, the multifunctional air permeability measuring device for measuring the air permeability of tubular air-permeable tubes provided by this utility model, through the special design of the tubular test head 20 on the air permeability measuring instrument 10 for cooperating with the tubular air-permeable tube 50 to test the air permeability of the tubular air-permeable tube 50, and the air path device 14, allows the gas delivered by the gas delivery device 30 to flow through the air pump 142, the pressure sensor 144, the flow sensor 145 and the tubular test interface 148 in sequence, and finally flow into the tubular air-permeable tube 50 from the through hole 23, thereby testing the air permeability of the tubular air-permeable tube 50.

[0053] The above are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Any modifications, equivalent substitutions or improvements within the spirit of the present utility model are covered within the scope of the claims of the present utility model.

Claims

1. A multifunctional air permeability measuring device for measuring the air permeability of tubular air-permeable tubes, characterized in that: The multifunctional air permeability measuring device for measuring the air permeability of a tubular air-permeable tube includes an air permeability measuring instrument, a tubular test head mounted on the air permeability measuring instrument, a gas delivery device externally connected to the multifunctional air permeability measuring device for supplying gas to the air permeability measuring instrument, and a planar filter membrane with the air permeability to be measured mounted on the air permeability measuring instrument. A tubular air-permeable tube with the air permeability to be measured is externally connected to the tubular test head. The air permeability measuring instrument includes a support for the air permeability measuring device. The apparatus includes a permeability measuring instrument body, a planar test head mounted on the permeability measuring instrument body for testing the permeability of the planar filter membrane, a cylinder assembly mounted on the permeability measuring instrument body for fixing the planar filter membrane, and an air passage device disposed inside the permeability measuring instrument body for gas flow. The planar test head includes a first planar support mounted on the permeability measuring instrument body for supporting the planar filter membrane. The first planar support includes a first planar support base for supporting the planar filter membrane, and a... A first gas through-hole for gas flow is formed on the first planar support base. The gas path device includes a cylinder through-hole connected to the gas delivery device, an air pump disposed in the body of the permeability measuring instrument and connected to the gas delivery device, a vent valve connected to the air pump for adjusting gas pressure, a pressure sensor connected to the air pump for measuring the gas pressure passing through the air pump, a flow sensor connected to the pressure sensor for measuring the gas flow rate passing through the air pump, a first air valve connected to the air pump flow sensor for controlling the on / off of the gas switch, a sheet-like test interface connected to the first air valve for supplying gas to the first gas through-hole, a second air valve connected to the first air valve for controlling the on / off of the tubular test gas switch, and a tubular test interface connected to the second air valve for supplying gas to the tubular test head. After the gas flows through the gas path pipe and is pressurized by the air pump, it flows successively through the pressure sensor, the flow sensor, the first air valve, and the second air valve, and finally flows out from the tubular test interface to measure the permeability of the tubular permeable tube.

2. The multifunctional air permeability measuring device for measuring the air permeability of tubular air-permeable tubes as described in claim 1, characterized in that: The air permeability tester also includes a first control device disposed on the air permeability tester body for controlling the switch of the air permeability tester, a second control device disposed on the air permeability tester body for controlling the mode selection of the air permeability tester, a printing device disposed on the air permeability tester body for printing out the test data results, a pressure regulating component disposed on the air permeability tester body for adjusting the internal gas pressure of the air permeability tester, and an air inlet disposed on the air permeability tester body for the gas delivered by the gas delivery device to pass through.

3. The multifunctional air permeability measuring device for measuring the air permeability of tubular air-permeable tubes as described in claim 1, characterized in that: The planar test head includes a second planar support that is spaced apart from and opposite to the first planar support and connected to the cylinder assembly.

4. The multifunctional air permeability measuring device for measuring the air permeability of tubular air-permeable tubes as described in claim 3, characterized in that: The first planar support is a cylinder, and the first planar support is fixed on the body of the air permeability measuring instrument. The first gas through hole is connected to the inside of the body of the air permeability measuring instrument to form an air passage.

5. The multifunctional air permeability measuring device for measuring the air permeability of tubular air-permeable tubes as described in claim 4, characterized in that: The second planar support includes a second planar support base spaced apart from the first planar support base, a shaft located between the second planar support base and the cylinder assembly, and a second gas through hole opened on the second planar support base facing the first planar support base. The second planar support is a cylinder, and the axes of the second planar support and the first planar support are on the same straight line.

6. The multifunctional air permeability measuring device for measuring the air permeability of tubular air-permeable tubes as described in claim 1, characterized in that: The cylinder assembly includes a cylinder bracket disposed on the permeability body, a cylinder disposed on the cylinder bracket, and at least one gas delivery pipe connecting the cylinder bracket and the cylinder.

7. The multifunctional air permeability measuring device for measuring the air permeability of a tubular air-permeable tube as described in claim 6, characterized in that: The cylinder support includes at least one cylinder support disposed on the permeability body, a cylinder support plate disposed on the cylinder support for supporting the cylinder, and a support through hole opened inside the cylinder support for the gas delivery pipe to pass through.

8. The multifunctional air permeability measuring device for measuring the air permeability of tubular air-permeable tubes as described in claim 1, characterized in that: The tubular test head includes a tubular test head body disposed on the air permeability measuring instrument body and used to support the tubular air permeable tube, a top groove formed on the side of the tubular test head body facing the tubular air permeable tube for abutting the tubular air permeable tube, and a through hole formed on the tubular test head body for supplying air to the tubular air permeable tube.

9. The multifunctional air permeability measuring device for measuring the air permeability of a tubular air-permeable tube as described in claim 1, characterized in that: The tubular vent is a tube closed at one end, and the tube radius is larger than the hole radius of the through hole.

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