Hollow fiber membrane filament testing unit and testing device

Abstract

The present application relates to the technical field of medical devices, and provides a hollow fiber membrane filament testing unit and a testing device, the hollow fiber membrane filament testing unit comprises a liquid cavity and a membrane filament arranged in the liquid cavity, a liquid inlet and a liquid outlet are arranged on the liquid cavity, both ends of the liquid cavity are provided with sealing surfaces, both ends of the membrane filament penetrate through the sealing surfaces to form a gas outlet and a gas inlet respectively. The present application has the advantages that: through the testing unit, the membrane filament can be tested for bursting force performance in the production of the membrane filament before the related terminal product of the membrane filament is manufactured, thereby avoiding economic losses caused by rework of the entire product due to unqualified products; in addition, the testing unit can facilitate researchers to perform performance research tests on the membrane filament during research and development, which is helpful for the research and development of the technology; furthermore, the testing unit has a simple structure and strong applicability, and can be used in different membrane filament performance testing devices.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, more particularly, to a hollow fiber membrane filament testing unit and testing device. BACKGROUND

[0002] Hollow fiber membranes are generally a combination of hollow tubular bodies, which are generally made into a bundle containing many membrane filaments during use, and then one end of the bundle is closed to form a closed end, and the other end is bonded together using epoxy resin, and the membrane filaments form an open end. The raw material liquid enters the hollow lumen of each membrane filament from the open end under the action of static pressure difference, and is filtered through the side wall of each membrane filament.

[0003] The production technology of hollow fiber membranes is becoming mature, and the structure is simple. Compared with flat membranes or spiral membranes, the specific surface area of hollow fiber membranes is large, the acting area is large, and no support layer is needed. Hollow fiber membranes are widely used in water treatment filters, medical artificial lungs, artificial kidneys and other fields. In the medical field, hollow fiber membranes are often used in membrane oxygenators, which are devices for extracorporeal oxygenation and carbon dioxide removal of blood of critically ill patients in the respiratory system. In the membrane oxygenator, the hollow fiber membrane lumen passes gas, and the outside passes blood. The principle is that when there is a partial pressure gradient of any gas component on both sides of the semi-permeable membrane, the corresponding gas molecules will diffuse from the side with a higher partial pressure to the side with a lower partial pressure, thereby achieving oxygenation and CO2 removal of human blood, adjusting O2 and CO2 in the blood. It can be seen that the hollow fiber membrane is the core component of the membrane oxygenator, and its performance has a great influence on the use of the membrane oxygenator.

[0004] In actual application, there is a high requirement for the mechanical strength of hollow fiber membranes, and the burst resistance is one of the effective parameters for characterizing the mechanical properties. The burst resistance includes the external burst pressure and the internal burst pressure. The internal burst resistance refers to the maximum pressure of the gas allowed to pass through the inside of the hollow fiber membrane filament under a certain blood pressure while ensuring that the membrane is not damaged. The external burst resistance refers to the maximum external blood pressure that the hollow fiber membrane filament structure can withstand without changing or damaging its structure. The existing hollow fiber membrane filament performance testing device mainly targets the breaking tensile strength, gas flux and pore size distribution, and there are still few testing techniques for its burst force. Even if there is a burst force testing device for the membrane oxygenator, it is used to test the entire terminal oxygenator product, and if the test is not qualified, the cost of rework and repair is high. Therefore, it is particularly important to study a device that can test the burst resistance of hollow fiber membranes during production and research and development, which is particularly important for assisting the promotion of membrane filament technology research and reducing the rework cost of related assembled products. SUMMARY

[0005] The present application aims to overcome at least one of the above-mentioned defects of the prior art, and provide a hollow fiber membrane filament testing unit and testing device with simple structure, and realize the anti-burst force testing in the membrane filament production and research and development stage.

[0006] One object of the present application is to provide a hollow fiber membrane filament testing unit, comprising a liquid cavity and a membrane filament arranged in the liquid cavity, wherein the liquid cavity is provided with a liquid inlet and a liquid outlet, and the two ends of the liquid cavity are provided with a sealing surface, and the two ends of the membrane filament penetrate through the sealing surface to form a gas outlet and a gas inlet respectively.

[0007] In the technical solution, the liquid cavity is used to contain the liquid for testing; the membrane filament is a hollow fiber membrane filament to be tested, which is arranged in the same direction as the radial direction of the liquid cavity; the liquid inlet provides a channel for the liquid to enter the liquid cavity; the liquid outlet is an opening communicating with the liquid inlet, and is used to provide a channel for the liquid to flow out of the liquid cavity; the sealing surface is used to seal the two ends of the liquid cavity; the gas outlet provides an outlet for the gas to flow out of the membrane filament, and the gas inlet provides an inlet for the gas to flow into the membrane filament. The two ends of the membrane filament can be flush with the sealing surface or penetrate through the sealing surface.

[0008] In the technical solution, the membrane filament in the liquid cavity is the part to be tested, and the two ends of the membrane filament are fixed by the sealing surfaces at the two ends of the liquid cavity, so that the part to be tested of the membrane filament is unfolded, and the testing is performed in the state of use in the terminal product. In use, the testing unit is vertically connected to the testing device to test the anti-burst force, so that the burst force performance of the membrane filament can be tested in the production of the membrane filament before the manufacture of the terminal product related to the membrane filament, and the economic loss caused by the rework of the entire product due to unqualified products is avoided. In addition, the testing unit can facilitate the researchers to test the performance of the membrane filament in the research and development, which is helpful for the technical research and development. Meanwhile, the testing unit has simple structure and strong applicability, and can be used in different membrane filament performance testing devices.

[0009] Further, the liquid cavity is formed by connecting the pipeline, the gas inlet pipeline, the gas outlet pipeline, the liquid inlet three-way joint and the liquid outlet three-way joint, the gas inlet pipeline and the connecting pipeline are connected through the liquid inlet three-way joint, the other opening of the liquid inlet three-way joint is the liquid inlet, the gas outlet pipeline and the connecting pipeline are connected through the liquid outlet three-way joint, the other opening of the liquid outlet three-way joint is the liquid outlet, the sealing surface is arranged at the end of the gas inlet pipeline and the gas outlet pipeline away from the connecting pipeline, and the membrane filament penetrates through the inside of the gas inlet pipeline, the gas outlet pipeline, the liquid inlet three-way joint and the liquid outlet three-way joint in sequence.

[0010] In the technical solution, the air inlet pipeline and the air outlet pipeline are pipelines with one end being a blocking surface and the other end being an opening, one end of the membrane wire penetrating through the blocking surface of the air inlet pipeline is an air inlet, and one end of the membrane wire penetrating through the blocking surface of the air outlet pipeline is an air outlet; the connecting pipeline is a pipeline with openings at both ends and communicating with the liquid inlet three-way joint and the liquid outlet three-way joint respectively.

[0011] Since the membrane wire burst is easily affected, especially in the stage of being stretched near the burst critical point, and the test unit is easily shaken when the pressure rises in the test, the membrane wire burst is affected by additional factors, and the test accuracy is reduced; especially in the process of anti-explosion pressure test, the pressure in the liquid cavity gradually rises, if the liquid cavity is designed in one piece, the impact force of the liquid entering the liquid cavity at the liquid inlet will cause the whole test unit to shake; therefore, the liquid cavity is designed as a segmented pipeline connection in the present solution, when the liquid enters the liquid cavity and impacts the liquid inlet, the liquid outlet three-way joint is not easily shaken with the liquid inlet three-way joint, thereby maintaining the stability of the whole test unit, avoiding the acceleration of the membrane wire burst due to the shaking of the test unit, thus improving the accuracy of the test unit in testing the burst pressure of the membrane wire, and providing reliable data for the production, detection and research and development of hollow fiber membranes.

[0012] Further, the liquid inlet three-way joint and the liquid outlet three-way joint are both in the shape of a square, the air inlet pipeline and the connecting pipeline are coaxially connected through the liquid inlet three-way joint, and the air outlet pipeline and the connecting pipeline are coaxially connected through the liquid outlet three-way joint.

[0013] In the technical solution, the vertical joint of the liquid inlet three-way joint and the liquid outlet three-way joint is the part penetrated by the membrane wire, and the horizontal joint part serves as the liquid inlet or the liquid outlet, and the air inlet pipeline, the connecting pipeline and the air outlet pipeline have the same central axis; in this way, the membrane wire in the pipeline can be prevented from being bent to affect the flow of gas, and the straight line design inside also facilitates the control of liquid pressure.

[0014] Further, the bending part of the liquid inlet three-way joint and the liquid outlet three-way joint is provided with a reinforcing mechanism.

[0015] In the technical solution, the reinforcing mechanism is used to increase the stability of the three-way joint, limit the shaking of the three-way joint during the pressurization of liquid or gas in the test, and further improve the accuracy of the test.

[0016] Further, the liquid inlet three-way joint and the liquid outlet three-way joint each include a liquid passing part and three opening parts, the liquid passing part is T-shaped, the liquid passing part is connected with the three opening parts, one end of the air inlet pipeline extends into the opening part and communicates with the liquid inlet three-way joint, one end of the air outlet pipeline extends into the opening part and communicates with the liquid outlet three-way joint, and the cross-sectional area of the liquid passing part is smaller than that of the opening part.

[0017] In the technical solution, the opening part is the part of the pipeline extending into the tee joint, and the liquid passing part is the part of the inner wall of the tee joint directly contacting with the liquid; the cross-sectional area of the liquid passing part is smaller than that of the opening part, so that a space is left in the opening part for placing the pipeline, so that the inner wall of the pipeline is flush with the inner wall of the liquid passing part, or the inner wall of the pipeline is outward relative to the inner wall of the liquid passing part, reducing the impact force on the connection between the pipeline and the tee joint when the liquid flows, making the air inlet pipeline, the air outlet pipeline and the connecting pipeline more stable in connection with the tee joint, and increasing the service life of the test unit.

[0018] Further, the part of the air inlet pipeline and the air outlet pipeline extending into the opening part accounts for 1 / 4-1 / 2 of the air inlet pipeline and the air outlet pipeline respectively.

[0019] In the technical solution, the appropriate length of the part of the air inlet pipeline and the air outlet pipeline extending into the opening part is designed, which is beneficial to saving materials and reducing production costs under the condition of stable connection of the pipeline with the tee joint.

[0020] Further, the end face of the membrane filament is flush with the plugging face.

[0021] In the technical solution, the plane of the two ends of the membrane filament is flush with the plugging face, so that the two ends can be fixed by the plugging face and form the air outlet and the air inlet at the same time, providing a passage for the gas to enter and flow out of the liquid cavity.

[0022] Another object of the application is to provide a hollow fiber membrane anti-burst pressure test device, which comprises a gas storage container, a liquid storage container, a gas supply pipeline connected to the gas storage container, a liquid outlet pipe and a liquid return pipe connected to the liquid storage container, and the hollow fiber membrane filament test unit described above, the gas storage container is communicated with the air inlet through the gas supply pipeline; the air outlet is connected with an exhaust pipe, and the exhaust pipe is provided with a gas flow detection device; the liquid storage container is communicated with the liquid outlet through the liquid outlet pipe and the liquid inlet, and the liquid outlet pipe is provided with a liquid outlet pressure gauge and a liquid pressure adjusting device, and the liquid storage container is communicated with the liquid outlet through the liquid return pipe and the liquid inlet.

[0023] In the technical solution, the gas storage container is used for storing the gas required for testing, and the liquid storage container is used for storing the liquid required for testing; the liquid outlet pipe provides a flow passage for the liquid flowing from the liquid storage container into the test unit; the liquid return pipe provides a flow passage for the liquid flowing from the test unit back to the liquid storage container; the gas supply pipeline provides a gas flow passage for the gas flowing from the gas storage container into the test unit; the exhaust pipe is a passage for the gas flowing out of the test unit; the gas flow detection device is used for detecting the gas flow in the membrane filament; the liquid outlet pressure gauge is used for measuring and indicating the liquid pressure in the liquid outlet pipe; and the liquid pressure adjusting device is used for adjusting the pressure of the liquid in the pipeline.

[0024] In the test of the anti-burst pressure of the membrane filament, gas enters the membrane filament from the gas storage container through the gas supply pipeline, liquid enters the liquid cavity from the liquid storage container through the liquid outlet pipeline, and then the liquid in the liquid cavity is gradually increased by adjusting the liquid pressure adjusting device, the membrane filament is crushed under the pressure of the liquid, and the inflection point of the gas flow is determined by observing the reading of the gas flow detection device.

[0025] The anti-burst pressure can be directly obtained by observing the gas flow inflection point, and the measurement operation is simple.

[0026] Further, the temperature control assembly includes a control element arranged outside the liquid storage container, a liquid temperature sensing element and a heating element arranged inside the liquid storage container, and the control element is electrically connected with the liquid temperature sensing element and the heating element.

[0027] In the technical scheme, the control element is used for controlling the liquid temperature, the temperature sensing element is used for sensing the liquid temperature and outputting a temperature signal, and the heating element is used for heating the liquid. The temperature control assembly controls the temperature of the liquid, so that the liquid simulates the temperature of different fiber membrane related products, and the applicability of the test data is improved.

[0028] Further, the bottom of the liquid storage container is provided with a liquid discharge pipe, and the liquid discharge pipe is provided with a liquid discharge adjusting mechanism.

[0029] In the technical scheme, the liquid discharge pipe is used for discharging the liquid in the liquid storage container, and the liquid discharge adjusting mechanism is used for adjusting the amount of discharged liquid.

[0030] Compared with the prior art, the beneficial effects of the present application are:

[0031] (1) The test unit of the present application can test the anti-burst performance of the membrane filament during the production of the membrane filament before the production of the membrane filament related terminal product, so as to avoid the economic loss caused by the rework of the entire product due to unqualified product; in addition, the test unit of the present application can facilitate the performance research and test of the membrane filament by the researchers during the research and development, which is helpful for the technical research and development.

[0032] (2) The test unit of the present application has simple structure and strong applicability, and can be used in different hydrophobic membrane filament performance test devices.

[0033] (3) The hollow fiber membrane anti-burst pressure test device of the present application can directly obtain the anti-burst pressure by observing the gas flow inflection point of the gas flow detection device, and the measurement operation is simple. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 This is a schematic diagram of the test unit structure in Example 1.

[0035] Figure 2 This is a schematic diagram of the test device structure in Example 2.

[0036] Reference numerals: Test unit 100, liquid chamber 110, liquid outlet 111, liquid inlet 112, sealing surface 113, air inlet pipe 114, connecting pipe 115, air outlet pipe 116, liquid inlet tee interface 117, liquid outlet tee interface 118, membrane fiber 120, air inlet 121, air outlet 122, opening 130, liquid passage section 140, reinforcing mechanism 150, gas storage container 200, gas supply pipe 210, gas pressure regulating device 211, gas temperature sensor 212, gas pressure gauge 213, liquid storage container 300, liquid outlet pipe 310, liquid outlet pressure gauge 321, liquid flow detection device 322, drain pipe 330, drain regulating mechanism 331, exhaust pipe 400, gas flow detection device 410, temperature control component 500, control element 510, liquid temperature sensing element 520, heating element 530. Detailed Implementation

[0037] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the invention. To better illustrate the following embodiments, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions; it is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0038] Example 1

[0039] like Figure 1 As shown, this embodiment provides a hollow fiber membrane filament testing unit 100, including a liquid chamber 110 and a membrane filament 120 disposed within the liquid chamber 110. The liquid chamber 110 is provided with a liquid inlet 112 and a liquid outlet 111. Both ends of the liquid chamber 110 are provided with sealing surfaces 113, for example, the sealing surfaces 113 can be formed by sealing both ends of the liquid chamber with adhesive. Both ends of the membrane filament 120 penetrate the sealing surfaces 113 to form an air outlet 122 and an air inlet 121, respectively, and the ends of the membrane filament 120 are flush with the sealing surfaces 113. Specifically, the hollow fiber membrane filament testing unit 100 is a vertical design, and the air inlet 121 is [not specified]. The membrane filament 120 is the hollow fiber membrane filament 120 to be tested.

[0040] The liquid cavity 110 is formed by the connecting pipe 115, the air inlet pipe 114, the air outlet pipe 116, the liquid inlet tee joint 117 and the liquid outlet tee joint 118. The air inlet pipe 114 and the connecting pipe 115 are communicated through the liquid inlet tee joint 117, and the other opening of the liquid inlet tee joint 117 is the liquid inlet 112. The air outlet pipe 116 and the connecting pipe 115 are communicated through the liquid outlet tee joint 118, and the other opening of the liquid outlet tee joint 118 is the liquid outlet 111. The sealing surface 113 is arranged at the end of the air inlet pipe 114 and the air outlet pipe 116 away from the connecting pipe 115. The membrane fiber 120 penetrates the inside of the air inlet pipe 114, the liquid inlet tee joint 117, the connecting pipe 115, the liquid outlet tee joint 118 and the air outlet pipe 116 in sequence.

[0041] Specifically, the hollow fiber membrane fiber test unit 100 is designed in a vertical manner. The air inlet 121 is the lower end of the membrane fiber 120, and the air outlet 122 is the upper end of the membrane fiber 120. The liquid inlet tee joint 117 is arranged below the liquid outlet tee joint 118.

[0042] The liquid inlet tee joint 117 and the liquid outlet tee joint 118 are both in the shape of “□”. The air inlet pipe 114 and the connecting pipe 115 are coaxially connected through the liquid inlet tee joint 117. The air outlet pipe 116 and the connecting pipe 115 are coaxially connected through the liquid outlet tee joint 118. The bending part of the liquid inlet tee joint 117 and the liquid outlet tee joint 118 is provided with a reinforcing mechanism 150. The reinforcing mechanism 150 can be in any shape for stability, for example, the reinforcing mechanism 150 is a cylindrical body parallel to the folding line.

[0043] The liquid inlet tee joint 117 and the liquid outlet tee joint 118 both include a liquid passing part 140 and three opening parts 130. The liquid passing part 140 is in the shape of T. The liquid passing part 140 is connected with the three opening parts 130. One end of the air inlet pipe 114 extends into the opening part 130 and is communicated with the liquid inlet tee joint 117. One end of the air outlet pipe 116 extends into the opening part 130 and is communicated with the liquid outlet tee joint 118. The cross-sectional area of the liquid passing part 140 is smaller than that of the opening part 130. The two ends of the connecting pipe 115 extend into the opening parts 130 and are communicated with the liquid inlet tee joint 117 and the liquid outlet tee joint 118, respectively.

[0044] The cross-sectional area of the liquid passing portion 140 is smaller than the cross-sectional area of the opening portion 130, so that a space is left in the opening portion 130 for placing the pipe, so that the inner wall of the pipe is flush with the inner wall of the liquid passing portion 140, or the inner wall of the pipe is outward relative to the inner wall of the liquid passing portion 140, reducing the impact force on the inner wall of the pipe and the three-way interface connection when the liquid flows, making the air inlet pipe 114, the air outlet pipe 116 and the connecting pipe 115 more stable in connection with the three-way interface, and increasing the service life of the test unit 100.

[0045] The part of the air inlet pipe 114 and the air outlet pipe 116 extending into the opening portion 130 accounts for 1 / 4-1 / 2 of the air inlet pipe 114 and the air outlet pipe 116 respectively. For example, the part of the air inlet pipe 114 extending into the opening portion 130 accounts for 1 / 3 of the air inlet pipe 114; the part of the air outlet pipe 116 extending into the opening portion 130 accounts for 1 / 3 of the air outlet pipe 116.

[0046] The test unit 100 of the embodiment is used in the vertical direction to access the test device for testing the explosion resistance, so that the explosion resistance performance of the membrane filament 120 can be tested in the production of the membrane filament 120 before the related terminal product of the membrane filament 120 is manufactured, avoiding economic loss caused by rework of the entire product due to unqualified products; in addition, the test unit 100 of the present application can facilitate researchers to conduct research and test on the performance of the membrane filament 120 in research and development, which is helpful for technical research and development; at the same time, the test unit 100 of the present application has simple structure and strong applicability, and can be used in different membrane filament performance test devices.

[0047] Embodiment 2

[0048] As shown in Figure 2 The embodiment provides a hollow fiber membrane anti-explosion pressure test device, which comprises a gas storage container 200, a liquid storage container 300, a gas supply pipe 210 connected to the gas storage container 200 and a liquid outlet pipe 310 and a liquid return pipe 320 connected to the liquid storage container 300, and the hollow fiber membrane filament test unit 100 provided in embodiment 1, the gas storage container 200 is communicated with the air inlet 121 through the gas supply pipe 210; the air outlet 122 is connected with an exhaust pipe 400, and the exhaust pipe 400 is provided with a gas flow detection device 410; specifically, the gas flow detection device 410 is a gas flow meter, more specifically, the gas flow meter is a soap bubble meter.

[0049] The liquid storage container 300 is communicated with the liquid outlet 112 through the liquid outlet pipe 310, and the liquid outlet pipe 310 is provided with a liquid outlet pressure gauge 311 and a liquid pressure regulating device 312, and the liquid storage container 300 is communicated with the liquid outlet 111 through the liquid return pipe 320. The bottom of the liquid storage container 300 is provided with a liquid discharge pipe 330, and the liquid discharge pipe 330 is provided with a liquid discharge regulating mechanism 331. Specifically, the liquid pressure regulating device 312 is a gear pump, and more specifically, the gear pump is a peristaltic pump; and the liquid discharge regulating mechanism 331 is a drain valve.

[0050] The test device of the embodiment further comprises a temperature control assembly 500, which comprises a control element 510 arranged outside the liquid storage container 300 and a liquid temperature sensing element 520 and a heating element 530 arranged inside the liquid storage container 300, and the control element 510 is electrically connected with the liquid temperature sensing element 520 and the heating element 530 respectively. Specifically, the liquid temperature sensing element 520 is a temperature sensor, and the heating element 530 is a heating rod.

[0051] Preferably, the liquid return pipe 320 is provided with a switch element 323, and specifically, the switch element 323 is a valve. The gas supply pipe 210 is further provided with a gas pressure regulating device 211, a gas temperature sensor 212 and a gas pressure gauge 213, and specifically, the gas pressure regulating device 211 is a pressure regulating valve. The liquid return pipe 320 is further provided with an outlet pressure gauge 321 and a liquid flow detection device 322, and specifically, the liquid flow detection device 322 is a liquid flow meter. In this way, more parameters in the test are monitored, which facilitates test adjustment and improves the accuracy of the test.

[0052] The specific use method of the test device of the embodiment is as follows. The gas and the liquid of the embodiment can be replaced according to the test needs, and the gas is taken as nitrogen and the liquid is taken as water. The hollow fiber membrane filament test unit 100 provided in embodiment 1 is connected to the test device, the liquid storage container 300 is filled with water, the heating element 530 is adjusted to heat the water to a target temperature, after the temperature is constant, the switch element 323 is opened, the liquid pressure regulating device 312 is started, and the water flow and the initial water pressure are adjusted to the required values, the gas flow detection device 410 is started, the gas pressure regulating device 211 is opened, and the nitrogen gas pressure is adjusted to a target value, after stabilization, the liquid pressure regulating device 312 is slowly adjusted, and the switch element 323 is coordinated, the water pressure is gradually increased, when the value of the gas flow meter appears an inflection point, the corresponding water pressure is the anti-burst pressure of the membrane filament.

[0053] The present scheme can directly obtain the anti-burst pressure by observing the reading of the gas flow detection device 410 to judge the gas flow inflection point, and the measurement operation is simple, and the test result is accurate and reliable.

[0054] Obviously, the above embodiments of the present application are only examples for clearly illustrating the technical solutions of the present application, and are not intended to limit the specific embodiments of the present application. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A testing device for the resistance of hollow fiber membrane to external burst pressure, comprising a gas storage container, a liquid storage container, a gas supply pipe connected to the gas storage container, and a liquid outlet pipe and a liquid return pipe connected to the liquid storage container, characterized in that, It also includes a hollow fiber membrane filament testing unit. The hollow fiber membrane filament testing unit includes a liquid chamber and a membrane filament disposed within the liquid chamber. The liquid chamber is provided with an inlet and an outlet. Both ends of the liquid chamber are provided with sealing surfaces. Both ends of the membrane filament penetrate the sealing surfaces to form an outlet and an inlet, respectively. The gas storage container is connected to the gas inlet through the gas supply pipe; the gas outlet is connected to an exhaust pipe, and the exhaust pipe is equipped with a gas flow detection device. The liquid storage container is connected to the liquid inlet through the liquid outlet pipe. The liquid outlet pipe is equipped with a liquid outlet pressure gauge and a liquid pressure regulating device. The liquid storage container is connected to the liquid outlet through the liquid return pipe. The liquid chamber is formed by connecting pipes, air inlet pipes, air outlet pipes, liquid inlet tee ports, and liquid outlet tee ports. The air intake pipe and the connecting pipe are connected through a liquid inlet tee, and the other opening of the liquid inlet tee is a liquid inlet. The gas outlet pipe and the connecting pipe are connected through a liquid outlet tee interface, and the other opening of the liquid outlet tee interface is a liquid outlet. The sealing surface is located at the end of the air inlet pipe and the air outlet pipe away from the connecting pipe, and the membrane filament sequentially passes through the interior of the air inlet pipe, the liquid inlet tee interface, the connecting pipe, the liquid outlet tee interface and the air outlet pipe; Both the liquid inlet tee and the liquid outlet tee include a liquid passage section and three openings. The liquid passage section is T-shaped and connected to the three openings. One end of the air inlet pipe extends into the opening and communicates with the liquid inlet tee. One end of the air outlet pipe extends into the opening and communicates with the liquid outlet tee. The cross-sectional area of ​​the liquid passage section is smaller than the cross-sectional area of ​​the openings.

2. The testing apparatus according to claim 1, characterized in that, Both the liquid inlet tee and the liquid outlet tee are "⺊" shaped. The air inlet pipe and the connecting pipe are coaxially connected through the liquid inlet tee, and the air outlet pipe and the connecting pipe are coaxially connected through the liquid outlet tee.

3. The testing apparatus according to claim 2, characterized in that, The inlet tee and outlet tee are equipped with reinforcement mechanisms at their bends.

4. The testing apparatus according to claim 1, characterized in that, The portions of the air inlet pipe and the air outlet pipe that extend into the opening occupy 1 / 4 to 1 / 2 of the air inlet pipe and the air outlet pipe, respectively.

5. The testing apparatus according to any one of claims 1 to 4, characterized in that, The end face of the membrane filament is flush with the sealing surface.

6. The testing apparatus according to claim 1, characterized in that, It also includes a temperature control component, which includes a control element located outside the liquid storage container and a liquid temperature sensing element and a heating element located inside the liquid storage container. The control element is electrically connected to the liquid temperature sensing element and the heating element, respectively.

7. The testing apparatus according to claim 1, characterized in that, The bottom of the liquid storage container is equipped with a drain pipe, and the drain pipe is equipped with a drain adjustment mechanism.

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