Multifunctional hollow fiber membrane testing device

Abstract

The utility model provides a multifunctional hollow fiber membrane testing device. The multifunctional hollow fiber membrane testing device comprises a compressed air release assembly, a first three-way pipe, a digital display pressure gauge, a first pressure regulating valve, a second three-way pipe, a first air pipe valve switch, a second air pipe valve switch, a bursting pressure testing assembly and a tangential flow testing assembly, the air inlet end of the compressed air release assembly communicates with one end of the first three-way pipe through an air pipe. The other two ends of the first three-way pipe are respectively connected to one side of a digital display pressure gauge and one side of a first pressure regulating valve through air pipes; the other side of the first pressure regulating valve is communicated to one end of a second three-way pipe through an air pipe; the other two ends of the second three-way pipe are respectively connected to one side of a first air pipe valve switch and one side of a second air pipe valve switch through air pipes; the other side of the first air pipe valve switch is connected with the bursting pressure testing assembly; the other side of the second air pipe valve switch is connected with the tangential flow testing assembly. The problems that the utilization rate and the testing efficiency of the hollow fiber membrane testing device are low are solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of fiber membrane testing, and particularly relates to a multifunctional hollow fiber membrane testing device. BACKGROUND

[0002] The hollow fiber membrane refers to a porous membrane with a fiber shape and a self-supporting effect, which is mainly processed into a hollow cavity fiber by taking polyether sulfone and dimethylacetamide as raw materials. The hollow fiber membrane has selective permeability and is widely used in medical treatment, biological medicine and industrial separation machine water treatment and the like.

[0003] The hollow fiber membrane has relatively wide performance indexes, and the most recognized test standards are protein retention rate, membrane burst pressure and pure water flux. The test devices in the related art are mostly only used for testing one performance, and the instrument cost is high, the utilization rate is low, and the test speed is slow, which are the disadvantages of testing the performance of the hollow fiber membrane. CONTENT OF THE UTILITY MODEL

[0004] The application provides a multifunctional hollow fiber membrane testing device to solve the problems of low utilization rate and test efficiency of the hollow fiber membrane testing device.

[0005] The application provides a multifunctional hollow fiber membrane testing device, which comprises a compressed air release assembly, a first three-way pipe, a digital pressure gauge, a first pressure regulating valve, a second three-way pipe, a first air pipe valve switch, a second air pipe valve switch, a burst pressure testing assembly and a tangential flow testing assembly. The air inlet end of the compressed air release assembly is connected to one end of the first three-way pipe through an air pipe. The other two ends of the first three-way pipe are respectively connected to the digital pressure gauge and one side of the first pressure regulating valve through air pipes. One side of the first pressure regulating valve is connected to one end of the second three-way pipe through an air pipe. The other two ends of the second three-way pipe are respectively connected to one side of the first air pipe valve switch and one side of the second air pipe valve switch through air pipes. The other side of the first air pipe valve switch is connected to the burst pressure testing assembly. The other side of the second air pipe valve switch is connected to the tangential flow testing assembly.

[0006] The multifunctional hollow fiber membrane testing device first provides a stable air source by releasing compressed air, so that high-pressure gas can be continuously supplied during the test to meet different test requirements. Then the compressed air is distributed to the digital pressure gauge and the first pressure regulating valve through the first three-way pipe to realize the monitoring and adjustment of the air pressure. Finally, the adjusted gas is distributed to the burst pressure testing assembly and the tangential flow testing assembly through the second three-way pipe to ensure that the two testing assemblies can independently test, thereby solving the problems of low utilization rate and test efficiency of the hollow fiber membrane testing device.

[0007] Optionally, the trachea is a polyurethane trachea; the outer diameter of the trachea is 12mm, and the inner diameter of the trachea is 8mm.

[0008] Due to the excellent wear resistance and flexibility of the polyurethane trachea, it can withstand high pressure and temperature changes and still work stably in a high-pressure environment without being prone to rupture or leakage; the outer diameter of the trachea is 12mm, and the inner diameter is 8mm, which can ensure sufficient airflow and maintain the strength and stability of the pipeline.

[0009] Optionally, the compressed air release assembly includes an air compressor, an air tank, a dryer, and a filter; one side of the air compressor is in communication with an air source; the other side of the air compressor is in turn in communication with the air tank, the dryer, and the filter; the air source is one or both of air or nitrogen.

[0010] The air compressor and the air tank can efficiently generate and store compressed air, reducing energy consumption and operating costs; the combination of the dryer and the filter can ensure the dryness and cleanliness of the compressed air, avoiding equipment failure and performance degradation caused by moisture and impurities; the compressed air release assembly supports the use of air or nitrogen as the air source, providing more options and flexibility to adapt to different industrial environments and specific needs.

[0011] Optionally, the burst pressure test assembly includes a third three-way pipe, a second pressure regulating valve, a two-way pipe, and a burst tank; the other side of the first tracheal valve switch is in turn in communication with a plurality of third three-way pipes; each third three-way pipe is in turn in communication with the second pressure regulating valve, the two-way pipe, and the hollow fiber membrane test piece; the burst tank is arranged below the hollow fiber membrane test piece, the burst tank is provided with a burst immersion liquid inside, and the hollow fiber membrane test piece is immersed in the inside of the burst immersion liquid.

[0012] The second pressure regulating valve can accurately control the pressure applied to the hollow fiber membrane, ensuring the accuracy and repeatability of the test results; the burst tank is used to observe and record the rupture of the hollow fiber membrane under high pressure, preventing potential dangers and equipment damage; the arrangement of multiple third three-way pipes allows simultaneous testing of multiple samples, improving the efficiency and throughput of the experiment; the hollow fiber membrane test piece is immersed in the burst immersion liquid, which can simulate actual use conditions and improve the accuracy and reliability of the test data.

[0013] Optionally, the tangential flow test assembly comprises a water storage tank, a fourth three-way pipe, a fifth three-way pipe, a third pressure regulating valve, a water pressure vacuum pressure gauge, a tangential flow hollow fiber membrane assembly and a liquid measuring device; the top of the water storage tank is provided with an air inlet and a liquid inlet, and the bottom of the water storage tank is provided with a liquid outlet; the other side of the second air pipe valve switch is communicated with the air inlet of the water storage tank; the liquid inlet of the water storage tank is sequentially communicated with a plurality of fourth three-way pipes; the liquid outlet of the water storage tank is sequentially communicated with a plurality of fifth three-way pipes; each fourth three-way pipe is sequentially communicated with one side of the tangential flow hollow fiber membrane assembly; the other side of the tangential flow hollow fiber membrane assembly is sequentially communicated with the water pressure vacuum pressure gauge, the third pressure regulating valve and the fifth three-way pipe; and the liquid outlet of the tangential flow hollow fiber membrane assembly is provided with the liquid measuring device at the bottom.

[0014] The modular design can be realized through a plurality of fourth three-way pipes and fifth three-way pipes, which facilitates quick configuration and adjustment according to different test requirements; the third pressure regulating valve can accurately control the pressure to ensure the stability of the pressure in the test process, thereby obtaining more accurate test results; the water pressure vacuum pressure gauge can allow real-time monitoring of the pressure change of the device to provide immediate feedback for the operator, which helps to timely adjust the test parameters; and the liquid measuring device can accurately measure the volume of the exudate to provide important data for evaluating the protein retention rate and pure water flux of the hollow fiber membrane.

[0015] Optionally, the specification of the digital pressure gauge is 0-2.5MPa; the set pressure range of the first pressure regulating valve is 0-0.8MPa; and the range of the water pressure vacuum pressure gauge is 0-1MPa.

[0016] The specification of the digital pressure gauge is 0-2.5MPa, which plays a role in monitoring the gas pressure; the set pressure range of the first pressure regulating valve is 0-0.8MPa, which plays a role in adjusting the stable gas source pressure in the test device; and the range of the water pressure vacuum pressure gauge is 0-1MPa, which plays a role in monitoring the liquid pressure.

[0017] Optionally, the third three-way pipe, the fourth three-way pipe and the fifth three-way pipe are all T-shaped three-way pipes; the T-shaped three-way pipe comprises a main pipe and a branch pipe, the main pipe and the branch pipe are perpendicular to each other; and one end of the main pipe is communicated with the middle part of the branch pipe.

[0018] The main pipe and the branch pipe of the T-shaped three-way pipe are perpendicular to each other, which not only can provide better mechanical stability and pressure resistance, and is suitable for use in high-pressure environment; but also can help to improve fluid flow, reduce turbulence and pressure loss, and is suitable for occasions requiring right-angle turning.

[0019] Optionally, a third air pipe valve switch is arranged between the liquid outlet of the water storage tank and the fifth three-way pipe.

[0020] The third air pipe valve switch, the fifth air pipe valve switch and the fourth air pipe valve switch can accurately control the flow rate of each branch, ensuring that the pressure and flow rate meet the predetermined requirements during the test.

[0021] Optionally, the first three-way pipe and the second three-way pipe are Y-shaped three-way pipes; the second three-way pipe is provided with a straight main pipe, one end of the straight main pipe is connected to two straight branch pipes respectively, and the straight branch pipes and the straight main pipe are parallel to each other.

[0022] The first three-way pipe and the second three-way pipe are Y-shaped three-way pipes, which helps to reduce the change of the direction of the fluid, thereby reducing the turbulent flow and pressure loss.

[0023] According to the above technical solution, the application provides a multifunctional hollow fiber membrane test device, which comprises a compressed air release assembly, a first three-way pipe, a digital pressure gauge, a first pressure regulating valve, a second three-way pipe, a first air pipe valve switch, a second air pipe valve switch, a burst pressure test assembly and a tangential flow test assembly; one end of the compressed air release assembly is connected to one end of the first three-way pipe through an air pipe; the other two ends of the first three-way pipe are connected to the digital pressure gauge and one side of the first pressure regulating valve through air pipes respectively; the other side of the first pressure regulating valve is connected to one end of the second three-way pipe through an air pipe; the other two ends of the second three-way pipe are connected to one side of the first air pipe valve switch and one side of the second air pipe valve switch through air pipes respectively; the other side of the first air pipe valve switch is connected to the burst pressure test assembly; the other side of the second air pipe valve switch is connected to the tangential flow test assembly, so as to solve the problems of low utilization rate and test efficiency of the hollow fiber membrane test device. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the application, the drawings needed in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0025] Figure 1 The structure diagram of the hollow fiber membrane test device described in the embodiments of the application.

[0026] ILLUSTRATION:

[0027] Wherein, 1-compressed air release assembly; 2-the first three-way pipe; 3-the second three-way pipe; 4-digital pressure gauge; 5-the first pressure regulating valve; 6-the first air pipe valve switch; 7-the second air pipe valve switch; 8-two-way pipe; 9-hollow fiber membrane test piece; 10-water storage tank; 11-air inlet; 12-liquid inlet; 13-liquid outlet; 14-water pressure vacuum pressure gauge; 15-tangential flow hollow fiber membrane assembly; 16-bursting tank; 17-liquid metering device; 18-the second pressure regulating valve; 19-the third three-way pipe; 20-the fourth three-way pipe; 21-the third pressure regulating valve; 22-the fifth three-way pipe. DETAILED DESCRIPTION

[0028] The following detailed description will be made with reference to the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following examples do not represent all the implementations consistent with the present application. They are merely examples of systems and methods consistent with some aspects of the present application.

[0029] To solve the problem of low utilization rate and test efficiency of hollow fiber membrane test device, see Figure 1 The embodiment of the present application provides a multifunctional hollow fiber membrane test device, which comprises a compressed air release assembly 1, a first three-way pipe 2, a digital pressure gauge 4, a first pressure regulating valve 5, a second three-way pipe 3, a first air pipe valve switch 6, a second air pipe valve switch 7, a bursting pressure test assembly and a tangential flow test assembly. The air inlet end of the compressed air release assembly 1 is connected to one end of the first three-way pipe 2 through an air pipe. The other two ends of the first three-way pipe 2 are respectively connected to the digital pressure gauge 4 and one side of the first pressure regulating valve 5 through air pipes. The other side of the first pressure regulating valve 5 is connected to one end of the second three-way pipe 3 through an air pipe. The other two ends of the second three-way pipe 3 are respectively connected to one side of the first air pipe valve switch 6 and one side of the second air pipe valve switch 7 through air pipes. The other side of the first air pipe valve switch 6 is connected to the bursting pressure test assembly. The other side of the second air pipe valve switch 7 is connected to the tangential flow test assembly.

[0030] It should be understood that the specifications of the first air pipe valve switch 6 and the second air pipe valve switch 7 can be selected as BUC-12. The first air pipe valve switch 6 and the second air pipe valve switch 7 are respectively connected to the bursting pressure test assembly and the tangential flow test assembly, which are used to control whether to perform single-phase performance test or multi-item performance test.

[0031] The multifunctional hollow fiber membrane testing device first provides a stable air source through compressed air release to continuously supply high-pressure gas during the testing process, meeting different testing needs; then the compressed air is distributed to the digital pressure gauge 4 and the first pressure regulating valve 5 through the first three-way pipe 2, realizing the monitoring and adjustment of air pressure; finally, the pressure-regulated gas is distributed to the burst pressure testing assembly and the tangential flow testing assembly through the second three-way pipe 3, to ensure that the two testing assemblies can independently perform testing, solving the problems of low utilization rate and testing efficiency of the hollow fiber membrane testing device.

[0032] In some embodiments, the air pipe is a polyurethane air pipe; the outer diameter of the air pipe is 12 mm, and the inner diameter of the air pipe is 8 mm.

[0033] It should be understood that the air pipes are transparent air pipes, facilitating the observation of the internal fluid flow. The air pipes are also suitable for the communication between other components.

[0034] Since the polyurethane air pipe has excellent wear resistance and flexibility, it can withstand higher pressure and temperature changes and still work stably in a high-pressure environment without being prone to rupture or leakage; the outer diameter of the air pipe is 12 mm, and the inner diameter is 8 mm, which can ensure sufficient air flow and maintain the strength and stability of the pipeline.

[0035] In some embodiments, the compressed air release assembly 1 includes an air compressor, an air tank, a dryer, and a filter; one side of the air compressor is in communication with an air source; the other side of the air compressor is in turn in communication with the air tank, the dryer, and the filter; the air source is one or both of air or nitrogen.

[0036] The air compressor and the air tank can efficiently generate and store compressed air, reducing energy consumption and operating costs; the combination of the dryer and the filter can ensure the dryness and cleanliness of the compressed air, avoiding equipment failure and performance degradation caused by moisture and impurities; the compressed air release assembly 1 supports the use of air or nitrogen as the air source, providing more options and flexibility to adapt to different industrial environments and specific needs.

[0037] In some embodiments, the burst pressure testing assembly includes a third three-way pipe 19, a second pressure regulating valve 18, a two-way pipe 8, and a burst tank 16; the other side of the first air pipe valve switch 6 is in turn in communication with a plurality of third three-way pipes 19; each third three-way pipe 19 is in turn in communication with the second pressure regulating valve 18, the two-way pipe 8, and the hollow fiber membrane testing piece 9; the burst tank 16 is arranged below the hollow fiber membrane testing piece 9, the burst tank 16 is internally provided with burst immersion liquid, and the hollow fiber membrane testing piece 9 is immersed in the interior of the burst immersion liquid.

[0038] The second pressure regulating valve 18 can accurately control the pressure applied to the hollow fiber membrane, ensuring the accuracy and repeatability of the test results; the burst tank 16 is used to observe and record the rupture of the hollow fiber membrane under high pressure, preventing potential hazards and equipment damage; the arrangement of multiple third three-way pipes 19 allows simultaneous testing of multiple samples, improving the efficiency and throughput of the experiment; the hollow fiber membrane test piece 9 is immersed in the burst infiltration liquid, which can simulate actual use conditions and improve the accuracy and reliability of the test data.

[0039] In some embodiments, the tangential flow test assembly includes a water storage tank 10, a fourth three-way pipe 20, a fifth three-way pipe 22, a third pressure regulating valve 21, a water pressure vacuum pressure gauge 14, a tangential flow hollow fiber membrane assembly 15, and a liquid measuring device 17; the water storage tank 10 is provided with an air inlet 11 and a liquid inlet 12 at the top, and a liquid outlet 13 at the bottom; the other side of the second air pipe valve switch 7 is connected to the air inlet 11 of the water storage tank 10; the liquid inlet 12 of the water storage tank 10 is connected to a plurality of fourth three-way pipes 20 in turn; the liquid outlet 13 of the water storage tank 10 is connected to a plurality of fifth three-way pipes 22 in turn; each fourth three-way pipe 20 is connected to one side of the tangential flow hollow fiber membrane assembly 15 in turn; the other side of the tangential flow hollow fiber membrane assembly 15 is connected to the water pressure vacuum pressure gauge 14, the third pressure regulating valve 21, and the fifth three-way pipe 22 in turn; the liquid outlet of the tangential flow hollow fiber membrane assembly 15 is provided with the liquid measuring device 17 at the bottom.

[0040] It should be understood that the water storage tank 10 is a sealed filling, when the liquid in the water storage tank 10 is pure water, the tangential flow pure water flux of the hollow fiber membrane can be tested, and when the liquid in the water storage tank 10 is a protein solution, the protein rejection rate of the hollow fiber membrane can be tested.

[0041] The modular design can be achieved through a plurality of fourth three-way pipes 20 and fifth three-way pipes 22, which facilitates quick configuration and adjustment according to different testing needs; the third pressure regulating valve 21 can accurately control the pressure, ensuring the stability of the pressure during the test, thereby obtaining more accurate test results; the water pressure vacuum pressure gauge 14 can allow real-time monitoring of device pressure changes, providing immediate feedback to the operator, which helps to adjust the test parameters in time; the arrangement of the liquid measuring device 17 can accurately measure the volume of the exudate, providing important data for evaluating the protein rejection rate and pure water flux of the hollow fiber membrane.

[0042] In some embodiments, the digital pressure gauge 4 has a specification of 0-2.5 MPa, and serves to monitor the gas pressure; the first pressure regulating valve 5 has a set pressure range of 0-0.8 MPa, and serves to regulate the stable gas source pressure in the testing device; and the water pressure vacuum pressure gauge 14 has a range of 0-1 MPa, and serves to monitor the liquid pressure.

[0043] In some embodiments, the third, fourth and fifth three-way pipes 19, 20 and 22 are all T-shaped three-way pipes; the T-shaped three-way pipe includes a main pipe and a branch pipe, which are perpendicular to each other; and one end of the main pipe is in communication with the middle part of the branch pipe.

[0044] The main pipe and the branch pipe of the T-shaped three-way pipe are perpendicular to each other, which not only provides better mechanical stability and pressure resistance, and is suitable for use in high-pressure environments, but also helps to improve fluid flow, reduce turbulence and pressure loss, and is suitable for occasions requiring right-angle turning.

[0045] In some embodiments, a third gas pipe valve switch is arranged between the liquid outlet 13 of the water storage tank 10 and the fifth three-way pipe 22; a fifth gas pipe valve switch is further arranged between two adjacent fifth three-way pipes 22; and a fourth gas pipe valve switch is further arranged between two adjacent fourth three-way pipes 20.

[0046] The third, fifth and fourth gas pipe valve switches can accurately control the flow rate of each branch, and ensure that the pressure and flow rate meet the predetermined requirements during the testing process.

[0047] In some embodiments, the first and second three-way pipes 2 and 3 are both Y-shaped three-way pipes; the second three-way pipe 3 is provided with a straight main pipe, one end of which is connected to two straight branch pipes, and the straight branch pipes and the straight main pipe are parallel to each other.

[0048] The first and second three-way pipes 2 and 3 are both Y-shaped three-way pipes, which helps to reduce the change of the direction of the fluid, thereby reducing turbulence and pressure loss.

[0049] According to the technical scheme, the embodiment of the application provides a multifunctional hollow fiber membrane testing device, which comprises a compressed air release assembly 1, a first three-way pipe 2, a digital pressure gauge 4, a first pressure regulating valve 5, a second three-way pipe 3, a first air pipe valve switch 6, a second air pipe valve switch 7, a burst pressure testing assembly and a tangential flow testing assembly; the air inlet end of the compressed air release assembly 1 is connected to one end of the first three-way pipe 2 through an air pipe; the other two ends of the first three-way pipe 2 are respectively connected to the digital pressure gauge 4 and one side of the first pressure regulating valve 5 through air pipes; the other side of the first pressure regulating valve 5 is connected to one end of the second three-way pipe 3 through an air pipe; the other two ends of the second three-way pipe 3 are respectively connected to one side of the first air pipe valve switch 6 and one side of the second air pipe valve switch 7 through air pipes; the other side of the first air pipe valve switch 6 is connected to the burst pressure testing assembly; the other side of the second air pipe valve switch 7 is connected to the tangential flow testing assembly, so as to solve the problems of low utilization rate and testing efficiency of the hollow fiber membrane testing device.

[0050] The similar parts among the embodiments provided in the application can be referred to each other, the specific embodiments provided above are only several examples under the general concept of the application, and do not constitute the limitation of the protection scope of the application. Any other embodiments extended according to the application scheme without creative labor belong to the protection scope of the application for the person skilled in the art.

Claims

1. A multifunctional hollow fiber membrane testing device, characterized by, include: Compressed air release assembly (1), first three-way pipe (2), digital pressure gauge (4), first pressure regulating valve (5), second three-way pipe (3), first air pipe valve switch (6), second air pipe valve switch (7), burst pressure test assembly and tangential flow test assembly; The air inlet of the compressed air release assembly (1) is connected to one end of the first three-way pipe (2) via an air pipe; the other two ends of the first three-way pipe (2) are respectively connected to one side of the digital pressure gauge (4) and the first pressure regulating valve (5) via air pipes; the other side of the first pressure regulating valve (5) is connected to one end of the second three-way pipe (3) via an air pipe; the other two ends of the second three-way pipe (3) are respectively connected to one side of the first air pipe valve switch (6) and the second air pipe valve switch (7) via air pipes; the other side of the first air pipe valve switch (6) is connected to the burst pressure test assembly; the other side of the second air pipe valve switch (7) is connected to the tangential flow test assembly.

2. The multi-functional hollow fiber membrane testing device according to claim 1, characterized by, The air tube is a polyurethane air tube; the outer diameter of the air tube is 12mm and the inner diameter of the air tube is 8mm.

3. The multifunctional hollow fiber membrane testing device according to claim 1, characterized by, The compressed air release assembly (1) includes an air compressor, an air tank, a dryer, and a filter; One side of the air compressor is connected to the air source; the other side of the air compressor is connected in sequence to the air tank, the dryer, and the filter.

4. The multi-functional hollow fiber membrane testing device according to claim 1, characterized by, The burst pressure test assembly includes a third three-way pipe (19), a second pressure regulating valve (18), a two-way pipe (8), and a burst chamber (16); The other side of the first air pipe valve switch (6) is connected to several third three-way pipes (19) in sequence; each third three-way pipe (19) is connected to the second pressure regulating valve (18), the two-way pipe (8) and the hollow fiber membrane test piece (9) in sequence; the bursting box (16) is located below the hollow fiber membrane test piece (9), and the bursting box (16) is filled with bursting impregnation liquid, and the hollow fiber membrane test piece (9) is immersed in the bursting impregnation liquid.

5. The multi-functional hollow fiber membrane testing device according to claim 4, characterized by, The tangential flow test assembly includes a water tank (10), a fourth three-way pipe (20), a fifth three-way pipe (22), a third pressure regulating valve (21), a water pressure vacuum gauge (14), a tangential flow hollow fiber membrane assembly (15), and a liquid measuring instrument (17); The water storage tank (10) is provided with an air inlet (11) and a liquid inlet (12) at the top, and a liquid outlet (13) at the bottom; the other side of the second air pipe valve switch (7) is connected to the air inlet (11) of the water storage tank (10); the liquid inlet (12) of the water storage tank (10) is connected to several fourth three-way pipes (20) in sequence; the liquid outlet (13) of the water storage tank (10) is connected to several fifth three-way pipes (22) in sequence; Each of the four three-way pipes (20) is connected to one side of the tangential flow hollow fiber membrane module (15) in turn; the other side of the tangential flow hollow fiber membrane module (15) is connected to the water pressure vacuum pressure gauge (14), the third pressure regulating valve (21) and the fifth three-way pipe (22) in turn; the liquid metering device (17) is arranged at the bottom of the permeate outlet of the tangential flow hollow fiber membrane module (15).

6. The multi-functional hollow fiber membrane testing device according to claim 5, characterized by, The digital pressure gauge (4) has a specification of 0-2.5MPa; the first pressure regulating valve (5) has a set pressure range of 0-0.8MPa; and the water pressure vacuum pressure gauge (14) has a range of 0-1MPa.

7. The multi-functional hollow fiber membrane testing device according to claim 5, characterized by, The third three-way pipe (19), the fourth three-way pipe (20) and the fifth three-way pipe (22) are all T-shaped three-way pipes. The T-shaped three-way pipe comprises a main pipe and a branch pipe, the main pipe and the branch pipe are perpendicular to each other, and one end of the main pipe is connected to the middle of the branch pipe.

8. The multi-functional hollow fiber membrane testing device according to claim 5, characterized by, A third air pipe valve switch is arranged between the liquid outlet (13) of the water storage tank (10) and the fifth three-way pipe (22); a fifth air pipe valve switch is further arranged between two adjacent fifth three-way pipes (22); and a fourth air pipe valve switch is further arranged between two adjacent fourth three-way pipes (20).

9. The multi-functional hollow fiber membrane testing device according to claim 1, characterized by, The first three-way pipe (2) and the second three-way pipe (3) are both Y-shaped three-way pipes. The second three-way pipe (3) is provided with a straight main pipe, one end of the straight main pipe is connected to two straight branch pipes respectively, and the straight branch pipes and the straight main pipe are parallel to each other.

Images