Hollow fiber membrane performance testing device and testing method

Abstract

A hollow fiber membrane performance test device, characterized by comprising a frame, a flux test tube, a pure water storage tank, a test liquid storage tank, a cup holder, a test measuring cup set, an electronic scale, a first conductivity meter, a second conductivity meter, a booster pump, a controller and an output display device. The invention also discloses a test method using the test device. The invention completes the hollow fiber membrane water flux and desalination rate test at one time; pure water and test liquid are used to flush the pipeline in each test, the test process is optimized, and the accuracy of the test data is improved.

Description

Technical Field

[0001] The invention relates to a testing device for hollow fiber membrane filaments, which can be used to measure the flux and desalination rate of the membrane filaments. The invention also relates to a testing method for the flux and desalination rate of the membrane filaments. Background Art

[0002] At present, the water flux and desalination rate tests of hollow fiber membranes are mostly performed manually. It is necessary to first prepare the test liquid of corresponding concentration according to the type of hollow fiber membrane, then bond and seal the membrane fibers in a closed cavity, start the booster pump to add the test liquid into the closed cavity, and run it at a constant temperature and pressure for 30 minutes. Then use a stopwatch and an electronic scale to measure the mass of the permeate over a period of time, and measure the conductivity of the test liquid and the permeate at the same time. The water flux and desalination rate of the membrane are calculated according to the formula.

[0003] The existing measurement methods have the following shortcomings:

[0004] 1. The existing hollow fiber membrane performance test requires the membrane to be bonded and encapsulated in a closed cavity. The membrane needs to be dried before bonding, and the adhesive also requires a long curing time, which affects the membrane performance and test efficiency;

[0005] 2. The testing process is complicated, time-consuming and inefficient;

[0006] 3. Testers need to participate in the entire testing process, which results in high labor costs;

[0007] 4. The test device cannot be reused, and the test cost is high;

[0008] 5. The relevant test data are recorded and calculated manually during the test process, with poor stability and accuracy.

[0009] To this end, technicians have conducted research and proposed a variety of improvement plans, see the Chinese invention patent application with application number 201110308575.6, "A hollow fiber membrane filtration performance test device" (publication number CN102407078A), which uses internal and external pressure methods to install the membrane filaments on the capillary joint for measurement, which requires manual participation, has a low degree of automation, cannot be tested in batches, and cannot achieve the test of desalination rate. Similar documents can also refer to the Chinese invention patent with patent number ZL20131074740.9, "Authorization announcement number CN10311423B"; the Chinese invention patent with patent number ZL201410649721.5, "Hollow fiber membrane placement device and membrane performance test device" (authorization announcement number CN10435334B). Summary of the invention

[0010] The first technical problem to be solved by the present invention is to provide a hollow fiber membrane performance testing device capable of simultaneously measuring water flux and desalination rate in view of the above-mentioned technical status quo.

[0011] The second technical problem to be solved by the present invention is to provide a hollow fiber membrane performance testing device with accurate measurement and high measurement efficiency in response to the above-mentioned technical status quo.

[0012] The third technical problem to be solved by the present invention is to provide a hollow fiber membrane performance testing method capable of simultaneously measuring water flux and desalination rate in view of the above-mentioned technical status.

[0013] The fourth technical problem to be solved by the present invention is to provide a hollow fiber membrane performance testing method with accurate measurement and high measurement efficiency in view of the above-mentioned technical status.

[0014] The technical solution adopted by the present invention to solve the above-mentioned first and second technical problems is: a hollow fiber membrane performance testing device, characterized in that it includes

[0015] A rack having a work surface;

[0016] The flux test tubes are provided for the membrane filaments to be tested, and are arranged in a plurality and side by side. Each flux test tube is provided obliquely on the aforementioned work surface and is connected with a liquid inlet pipeline and a liquid outlet pipeline at both ends. The lower end of each flux test tube has a membrane filament hole for the membrane filaments to be provided.

[0017] A pure water storage tank connected to the aforementioned liquid inlet pipeline via a pure water pipeline, and a first water inlet valve is provided on the pure water pipeline;

[0018] A test liquid storage tank connected to the aforementioned liquid inlet pipeline via a test liquid pipeline, and a second water inlet valve is provided on the test liquid pipeline;

[0019] A cup holder, which can be horizontally arranged on the aforementioned frame;

[0020] A test measuring cup set, placed on the aforementioned cup holder and capable of receiving the permeate flowing out of the tested membrane filament holes, is composed of at least four test measuring cups arranged side by side, namely a first measuring cup for receiving the pure water cleaning permeate, a second measuring cup for receiving the pure water pressure-stabilizing permeate, a third measuring cup for receiving the test liquid cleaning permeate, and a fourth measuring cup for receiving the test liquid pressure-stabilizing permeate;

[0021] An electronic scale, arranged on the working surface of the aforementioned frame, for weighing the weight of the fourth measuring cup;

[0022] A first conductivity meter, movably mounted on the aforementioned frame, for measuring the ion concentration of the permeate in the test cup;

[0023] A second conductivity meter is disposed near the test liquid storage tank and is used to measure the ion concentration of the test liquid in the test liquid outlet tank;

[0024] The booster pump is installed on the frame, and after being started, it can pump the liquid in the pure water storage tank and the test liquid storage tank into the flux test tube through the liquid inlet pipeline;

[0025] A controller, whose signal input end is connected to the signal output ends of the aforementioned electronic scale, the first conductivity meter and the second conductivity meter and can obtain the water flux and conductivity of the membrane filament to be tested based on the collected data, and whose signal output end is connected to the aforementioned first water inlet valve, the second water inlet valve and the booster pump; and

[0026] The output display device is connected to the signal output terminal of the controller.

[0027] Furthermore, the liquid outlet pipeline is provided with an adjustable flow meter. The liquid outlet pipeline is provided with a pressure gauge.

[0028] Taking into account the recovery of pure water and test liquid, the liquid outlet end of the liquid outlet pipeline has a first loop and a second loop respectively connected to the pure water storage tank and the test liquid storage tank, and the first loop and the second loop are respectively provided with a first water outlet valve and a second water outlet valve, and the liquid inlet pipeline is connected to a pure water drain pipeline and a test liquid drain pipeline, and the pure water drain pipeline and the test liquid drain pipeline are respectively provided with a first drain valve and a second drain valve, and the first water outlet valve, the second water outlet valve, the first drain valve and the second drain valve are controlled by a controller.

[0029] Furthermore, the first conductivity meter can move in a first direction and a second direction through a first driving mechanism, the first direction and the second direction are perpendicular to each other, the first measuring cup, the second measuring cup, the third measuring cup and the fourth measuring cup are arranged in the first direction, and the test measuring cup group is at least two groups and is arranged along the second direction, and the first driving mechanism is controlled by a controller.

[0030] Furthermore, the cup holder can be translatedly arranged on the work surface through a second driving mechanism, the aforementioned second driving mechanism includes a motor, a screw and a slider, the power output end of the aforementioned motor is connected to the screw, the aforementioned slider is sleeved on the screw and cooperates with the external thread of the screw, one side of the aforementioned cup holder is fixedly connected to the aforementioned slider, and the aforementioned motor is controlled by a controller.

[0031] The lower end of the flux test tube is provided with a silicone head, and the silicone head has a membrane thread hole for the membrane thread to be tested to pass through and set. The membrane thread is easy to fix and the damage to the membrane thread is minimal.

[0032] Furthermore, the liquid outlet pipeline is connected with a vent pipe, and the vent pipe is provided with a drain valve, and the drain valve is controlled by a controller.

[0033] The technical solution adopted by the present invention to solve the third and fourth technical problems is: a method for testing the performance of a hollow fiber membrane, characterized by comprising the following steps:

[0034] ① Before the test, place the pure water and test liquid in the pure water storage tank and the test liquid storage tank respectively, place the test measuring cup set in the cup holder, and fix the hollow fiber membrane to be tested in the flux test tube;

[0035] ② Start the booster pump and open the first water inlet valve to pre-pressurize pure water. After the flux test tube is filled with solution, adjust the pressure regulating flow meter and observe that the pressure gauge is adjusted to the test pressure.

[0036] ③ After the pre-pressurization time is up, the booster pump stops, and the second driving mechanism drives the cup holder to move so that the second measuring cup can receive the permeate, and after it is in place, the pure water pressure is stabilized;

[0037] ④ After the pure water pressure is stabilized, the booster pump stops, the first drain valve opens, and the pure water in the flux test tube and pipeline is drained. The second drive mechanism continues to drive the cup holder to move so that the third measuring cup can receive the permeate;

[0038] ⑤ After the pure water in the flux test tube and pipeline is drained, close the first drain valve, start the booster pump, and at the same time open the second water inlet valve to pre-pressurize the test liquid;

[0039] ⑥ After the test liquid pre-pressure time is up, the booster pump stops, and the second drive mechanism continues to drive the cup holder to move so that the fourth measuring cup can receive the permeated liquid, and the test liquid test is carried out after it is in place;

[0040] ⑦ After the test liquid test is completed, the second drain valve is opened to drain the test liquid in the flux test tube and pipeline;

[0041] ⑧At the same time, the electronic scale under the fourth measuring cup and the first conductivity meter transmit data to the controller;

[0042] ⑨ After processing, the relevant test data is transmitted to the output display device.

[0043] The liquid outlet pipeline is connected with a vent pipe, which is provided with a drain valve. The drain valve is controlled by a controller. When the first drain valve or the second drain valve is opened, the drain valve is opened, and the pressure in the pipe is kept consistent with the atmosphere, which is conducive to draining.

[0044] Compared with the prior art, the advantages of the present invention are: the present invention completes the water flux and desalination rate test of the hollow fiber membrane at one time; pure water and test liquid are used to flush the pipeline in each test, optimizing the test process and improving the accuracy of the test data; the hollow fiber membrane is simple to install and fix, and the experimental data is automatically recorded and calculated during the test, the test process has a high degree of automation, and the test efficiency and stability are greatly improved; there is less manual participation in the test process, and the test device can be reused, reducing labor and testing costs; human errors are avoided, and the test data is accurate and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic diagram of the structure of an embodiment.

[0046] Figure 2 It is a schematic diagram of the structure after the frame is removed in the embodiment.

[0047] Figure 3 Schematic diagram of pipeline connection in the embodiment.

[0048] Figure 4 This is an enlarged view of the flux test tube in the embodiment.

[0049] Figure 5 It is an enlarged view of the second driving mechanism in the embodiment.

[0050] Figure 6 It is an enlarged view of the first driving mechanism in the embodiment. DETAILED DESCRIPTION

[0051] The present invention is further described in detail below with reference to the accompanying drawings.

[0052] like Figure 1 , Figure 2 and Figure 3 As shown, the hollow fiber membrane performance test device in this embodiment includes a frame 1, a flux test tube 2, a pure water storage tank 61, a test liquid storage tank 62, a cup holder 3, a test cup set, an electronic scale 35, a first conductivity meter 41, a second conductivity meter 42, a booster pump 5, a controller and an output display device 100. The frame 1 has a work surface 11.

[0053] The flux test tubes 2 are provided for the membrane filaments to be tested. In the present embodiment, there are four of them arranged side by side. Each flux test tube 2 is tilted on the workbench 11 and is connected with a liquid inlet pipeline 98 and a liquid outlet pipeline 99 at both ends. The tilt angle of each flux test tube 2 is preferably 20°, which is achieved by the short support plate 2b and the long support plate 2a; the liquid outlet pipeline 99 is provided with an adjustable flow meter 59 and a pressure gauge 58.

[0054] Combination Figure 4As shown, the flux test tube 2 has a first connection port 21 at the upper end and a second connection port 22 at the lower end. The first connection port is used as a water inlet when water is inlet and pressure is stabilized, and as a drain port when water is discharged. The second connection port 22 is used as a water inlet when water is inlet and pressure is stabilized, and as an emptying port when water is discharged. A silicone head 23 is provided at the lower end of each flux test tube 2. The silicone head 23 has a membrane thread hole 231 for the membrane thread to be tested to pass through. The silicone head 23 is screwed and tightened by a cover 24.

[0055] The pipeline connections of each flux test tube 2 are all independently connected in parallel without interfering with each other. Two adjacent ones correspond to the test measuring cup groups of the front and rear rows.

[0056] The pure water storage tank 61 is connected to the liquid inlet pipeline 98 through a pure water pipeline 91, and a first water inlet valve 51 is provided on the pure water pipeline 91; the test liquid storage tank 62 is connected to the liquid inlet pipeline 98 through a test liquid pipeline 92, and a second water inlet valve 52 is provided on the test liquid pipeline 92;.

[0057] Combination Figure 5 As shown, the cup holder 3 can be arranged on the frame 1 in a translational manner; specifically, the cup holder 3 can be arranged on the work surface 11 in a translational manner through the second driving mechanism 72, the second driving mechanism 72 includes a motor 722, a screw rod 724 and a slider 723, the power output end of the motor 722 is connected to the screw rod 724, the slider 723 is sleeved on the screw rod 724 and matched with the external thread of the screw rod 724, the connecting part 36 on one side of the cup holder 3 is fixedly connected to the slider 723, and the motor 722 is controlled by the controller. A cover 721 is sleeved on the outer periphery of the second driving mechanism 72.

[0058] There are four test measuring cup groups, two adjacent groups and two front and back groups. Each test measuring cup group is placed on the cup holder 3 and can receive the permeate flowing out of the tested membrane filament hole 231, and is composed of four test measuring cups arranged side by side, namely the first measuring cup 31, the second measuring cup 32, the third measuring cup 33 and the fourth measuring cup 34.

[0059] Description of the test measuring cups: The first measuring cup 31 is used to receive the pure water cleaning permeate, which is a waste liquid; the second measuring cup 32 is used to receive the pure water pressure-stabilized permeate, which can be used for flux comparison experimental data; the third measuring cup 33 is used to receive the test liquid cleaning permeate, which is a waste liquid; the fourth measuring cup 34 is used to receive the pipeline test liquid pressure-stabilized permeate; the test liquid pressure-stabilized permeate is used for flux and desalination calculations.

[0060] The electronic scale 35 is disposed on the work surface 11 of the frame 1, and is used to weigh the weight of the fourth measuring cup 34; the first conductivity meter 41 is movably disposed on the frame 1, and is used to measure the ion concentration of the permeate in the test measuring cup; Figure 6As shown, the first conductivity meter 41 can move in the first direction and the second direction through the first driving mechanism 71, the first direction and the second direction are perpendicular to each other, the first measuring cup 31, the second measuring cup 32, the third measuring cup 33 and the fourth measuring cup 34 are arranged in the first direction, and the test measuring cup group is two groups and arranged along the second direction, and the first driving mechanism 71 is controlled by the controller. The first driving mechanism in this embodiment has a mounting rod 711 for setting the first conductivity meter, and a cover 712 is provided on the outer periphery of the first driving mechanism 71. The first driving mechanism 71 can use a motor and a screw rod to achieve bidirectional control, or a power source such as a cylinder, which will not be further expanded here.

[0061] The second conductivity meter 42 is disposed close to the test liquid storage tank 62 and is used to measure the conductivity of the test liquid in the test liquid storage tank 62 .

[0062] The booster pump 5 is arranged on the frame 1 and can pump the liquid in the pure water storage tank 61 and the test liquid storage tank 62 into the flux test tube 2 through the liquid inlet pipeline 98 after being started.

[0063] The signal input end of the controller (not shown in the figure) is connected to the signal output end of the electronic scale 35, the first conductivity meter 41 and the second conductivity meter 42, and can obtain the water flux and conductivity of the membrane filament to be tested based on the collected data. The signal output end is connected to the first water inlet valve 51, the second water inlet valve 52 and the booster pump 5; the output display device 100 is connected to the signal output end of the controller. The controller in this embodiment is built into the output display device 100 and can be implemented by PLC programming.

[0064] Combination Figure 3 As shown, the liquid outlet end of the liquid outlet pipeline 99 has a first circuit 95 and a second circuit 96 respectively connected to the pure water storage tank 61 and the test liquid storage tank 62, and the first circuit 95 and the second circuit 96 are respectively provided with a first water outlet valve 55 and a second water outlet valve 56, and the liquid inlet pipeline 98 is connected to a pure water discharge pipeline 93 and a test liquid discharge pipeline 94, and the pure water discharge pipeline 93 and the test liquid discharge pipeline 94 are respectively provided with a first drain valve 53 and a second drain valve 54, and the first water outlet valve 55, the second water outlet valve 56, the first drain valve 53 and the second drain valve 54 are controlled by a controller.

[0065] The liquid outlet pipeline 99 is connected to a vent pipe 97 , and the vent pipe 97 is provided with a drain valve 57 , and the drain valve 57 is controlled by a controller.

[0066] The hollow fiber membrane performance test method includes the following steps:

[0067] ① Before the test, pure water and test liquid are placed in the pure water storage tank 61 and the test liquid storage tank 62 respectively, the test measuring cup set is placed in the cup holder 3, and the hollow fiber membrane to be tested is fixed in the flux test tube 2;

[0068] ② Start the booster pump 5 and open the first water inlet valve 51 to pre-pressurize pure water. After the flux test tube 2 is filled with solution, adjust the pressure regulating flow meter 59 and observe that the pressure gauge 58 is adjusted to the test pressure.

[0069] ③ After the pre-pressurization time is up, the booster pump 5 stops, and the second driving mechanism 72 drives the cup holder 3 to move, so that the second measuring cup 32 can receive the permeate, and after it is in place, the pure water pressure is stabilized;

[0070] ④ After the pure water pressure is stabilized, the booster pump 5 stops, the first drain valve 53 opens, the flux test tube 2 and the pure water in the pipeline are drained, and the second drive mechanism 72 continues to drive the cup holder 3 to move so that the third measuring cup 33 can receive the permeate;

[0071] ⑤ After the pure water in the flux test tube 2 and the pipeline is drained, the first drain valve 53 is closed, the booster pump 5 is started, and the second water inlet valve 52 is opened at the same time to pre-pressurize the test liquid;

[0072] ⑥ After the test liquid pre-pressing time is up, the booster pump 5 stops, and the second driving mechanism 72 continues to drive the cup holder 3 to move, so that the fourth measuring cup 34 can receive the permeated liquid, and the test liquid test is performed after it is in place;

[0073] ⑦ After the test liquid test is completed, the second drain valve 54 is opened to drain the test liquid in the flux test tube 2 and the pipeline;

[0074] ⑧ At the same time, the electronic scale 35 and the first conductivity meter 41 below the fourth measuring cup 34 transmit data to the controller;

[0075] ⑨ After being processed, the relevant test data is transmitted to the output display device 100.

[0076] When the first drain valve 53 or the second drain valve 54 is opened, the drain valve 57 is opened.

[0077] The formula involved in this embodiment is as follows:

[0078] 1. Water flux test method:

[0079] F=V / At

[0080] F—flux, in liters per square meter per hour L / (m 2 h);

[0081] V—The volume of permeate collected during time t, in liters (L),

[0082] In this case, V is given by the formula V = M / ρ (volume = mass / density);

[0083] A—Effective membrane area, in square meters (M 2 );

[0084] t is the time taken to collect volume V of permeate, expressed in hours (h).

[0085] 2. Desalination test method:

[0086] R=(1-C p / C f )×100%

[0087] R—desalination rate, %;

[0088] C p —Permeate concentration, measured by conductivity meter;

[0089] C f —Test solution concentration, measured by a conductivity meter.

Claims

1. A hollow fiber membrane performance testing device, characterized in that include A frame (1) having a work surface (11); The flux test tubes (2) are provided for the membrane filaments to be tested, and are in plurality and arranged side by side. Each flux test tube (2) is provided obliquely on the aforementioned work surface (11) and is connected to a liquid inlet pipeline (98) and a liquid outlet pipeline (99) at both ends. The lower end of each flux test tube (2) has a membrane filament hole (231) for the membrane filaments to be provided. A pure water storage tank (61) is connected to the aforementioned liquid inlet pipeline (98) via a pure water pipeline (91), and a first water inlet valve (51) is provided on the pure water pipeline (91); A test liquid storage tank (62) is connected to the aforementioned liquid inlet pipeline (98) via a test liquid pipeline (92), and a second water inlet valve (52) is provided on the test liquid pipeline (92); A cup holder (3) which is movably arranged on the frame (1); A test measuring cup set, placed on the aforementioned cup holder (3) and capable of receiving the permeate flowing out of the tested membrane filament holes (231), comprising at least four test measuring cups arranged side by side, namely a first measuring cup (31) for receiving the pure water cleaning permeate, a second measuring cup (32) for receiving the pure water pressure-stabilizing permeate, a third measuring cup (33) for receiving the test liquid cleaning permeate, and a fourth measuring cup (34) for receiving the test liquid pressure-stabilizing permeate; an electronic scale (35), disposed on the work surface (11) of the frame (1), and used for weighing the weight of the fourth measuring cup; A first conductivity meter (41) is movably mounted on the frame (1) and is used to measure the ion concentration of the permeate in the test cup; A second conductivity meter (42) is disposed near the test liquid reservoir (62) and is used to measure the ion concentration of the test liquid in the test liquid reservoir; A booster pump (5) is arranged on the frame (1) and can pump the liquid in the pure water storage tank (61) and the test liquid storage tank (62) into the flux test tube (2) through the liquid inlet pipeline (98) after being started; A controller, wherein the signal input end is connected to the signal output ends of the aforementioned electronic scale (35), the first conductivity meter (41) and the second conductivity meter (42) and can obtain the water flux and conductivity of the membrane filament to be tested based on the collected data, and the signal output end is connected to the aforementioned first water inlet valve (51), the second water inlet valve (52) and the booster pump (5); and The output display device (100) is connected to the signal output terminal of the controller.

2. The hollow fiber membrane performance testing device according to claim 1 is characterized in that The liquid outlet pipeline (99) is provided with an adjustable flow meter (59).

3. The hollow fiber membrane performance testing device according to claim 2 is characterized in that The liquid outlet pipeline (99) is provided with a pressure gauge (58).

4. The hollow fiber membrane performance testing device according to claim 3 is characterized in that The liquid outlet end of the liquid outlet pipeline (99) comprises a first circuit (95) and a second circuit (96) respectively connected to the pure water storage tank (61) and the test liquid storage tank (62); the first circuit (95) and the second circuit (96) are respectively provided with a first water outlet valve (55) and a second water outlet valve (56); the liquid inlet pipeline (98) is connected with a pure water discharge pipeline (93) and a test liquid discharge pipeline (94); the pure water discharge pipeline (93) and the test liquid discharge pipeline (94) are respectively provided with a first drain valve (53) and a second drain valve (54); the first water outlet valve (55), the second water outlet valve (56), the first drain valve (53) and the second drain valve (54) are controlled by a controller.

5. The hollow fiber membrane performance testing device according to claim 1 is characterized in that The first conductivity meter (41) can move in a first direction and a second direction through a first driving mechanism (71), the first direction and the second direction being perpendicular to each other, the first measuring cup (31), the second measuring cup (32), the third measuring cup (33) and the fourth measuring cup (34) being arranged in the first direction, and the test measuring cup groups are at least two groups and are arranged in the second direction, and the first driving mechanism (71) is controlled by a controller.

6. The hollow fiber membrane performance testing device according to claim 5 is characterized in that The cup holder (3) can be arranged on the work surface (11) in a translational manner through a second driving mechanism (72). The second driving mechanism (72) comprises a motor, a screw and a slider. The power output end of the motor is connected to the screw. The slider is sleeved on the screw and matched with the external thread of the screw. One side of the cup holder (3) is fixedly connected to the slider. The motor is controlled by a controller.

7. The hollow fiber membrane performance testing device according to claim 1 is characterized in that The lower end of the flux test tube (2) is provided with a silica gel head (23), and the silica gel head (23) has a membrane thread hole (231) for the membrane thread to be tested to pass through.

8. The hollow fiber membrane performance testing device according to claim 1, characterized in that The liquid outlet pipeline (99) is connected to a vent pipe (97), and the vent pipe (97) is provided with a drain valve (57), and the drain valve (57) is controlled by a controller.

9. A method for testing the hollow fiber membrane performance test device according to claim 5, characterized in that The steps include: ① Before testing, pure water and test liquid are placed in the pure water storage tank (61) and the test liquid storage tank (62), the test measuring cup set is placed in the cup holder (3), and the hollow fiber membrane to be tested is fixed in the flux test tube (2); ② The booster pump (5) is started, and the first water inlet valve (51) is opened at the same time to pre-pressurize pure water. After the flux test tube (2) is filled with solution, the pressure regulating flow meter (59) is adjusted, and the pressure gauge (58) is observed to be adjusted to the test pressure; ③ After the pre-pressurization time is up, the booster pump (5) stops, and the second drive mechanism (72) drives the cup holder (3) to move so that the second measuring cup (32) can receive the permeate, and after it is in place, the pure water pressure is stabilized; ④ After the pure water pressure is stabilized, the booster pump (5) stops, the first drain valve (53) opens, the flux test tube (2) and the pure water in the pipeline are drained, and the second drive mechanism (72) continues to drive the cup holder (3) to move, so that the third measuring cup (33) can receive the permeate; ⑤ After the pure water in the flux test tube (2) and the pipeline is drained, the first drain valve (53) is closed, the booster pump (5) is started, and the second water inlet valve (52) is opened at the same time to pre-pressurize the test liquid; ⑥ After the test liquid pre-pressurization time is up, the booster pump (5) stops, and the second drive mechanism (72) continues to drive the cup holder (3) to move, so that the fourth measuring cup (34) can receive the permeated liquid, and after it is in place, the test liquid test is carried out; ⑦ After the test liquid test is completed, the second drain valve (54) is opened to drain the test liquid in the flux test tube (2) and the pipeline; ⑧ At the same time, the electronic scale (35) below the fourth measuring cup (34) and the first conductivity meter (41) transmit data to the controller; ⑨ After being processed, the relevant test data is transmitted to the output display device (100).

10. The testing method according to claim 9, characterized in that The liquid outlet pipeline (99) is connected to a vent pipe (97), and the vent pipe (97) is provided with a drain valve (57). The drain valve (57) is controlled by a controller. When the first drain valve (53) or the second drain valve (54) is opened, the drain valve (57) is opened.

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