Device and method for testing external pressure resistance of hollow fiber membrane

Abstract

The invention belongs to the technical field of external pressure detection, and particularly relates to a hollow fiber membrane external pressure resistance testing device and method.The hollow fiber membrane external pressure resistance testing device comprises a base, a detection mechanism is arranged on the base, a pressurization mechanism is arranged on one side of the detection mechanism, and a console body is fixedly connected to the base. The motor can drive the adjusting column to rotate, the extension length of the adjusting plate is adjusted by means of the magnetic action of the electromagnetic block and the permanent magnet block, the fluid flow section is dynamically optimized, the stable pipeline pressure is guaranteed, meanwhile, the liquid spraying head can move in the membrane and achieve uniform liquid spraying, impact on the test pressure due to the too high flow speed of fluid in the membrane can be avoided, and the test efficiency is improved. The use state of the hollow fiber membrane under different flow speed working conditions can be simulated, the test scene is more suitable for practical application, the sliding position of the movable cover is adjusted through the second hydraulic telescopic rod, the exposed area of the open groove in the fixed pipe is changed, accordingly, fluid resistance and output pressure are accurately adjusted and controlled, and stepped lifting or constant maintaining of the pressure is achieved.

Description

Technical Field

[0001] This invention belongs to the field of external pressure testing technology, and in particular relates to a device and method for testing the external pressure resistance of hollow fiber membranes. Background Technology

[0002] Hollow fiber membranes, as a novel material, possess high specific surface area and excellent separation performance, and are widely used in water treatment, wastewater treatment, biomedicine, food industry, and other fields. In practical applications, hollow fiber membranes often operate under external pressure environments. For example, in membrane separation processes such as ultrafiltration and microfiltration, the pressure load on the outside of the membrane directly affects the membrane's structural stability, separation efficiency, and service life. A hollow fiber membrane external pressure resistance testing device is a mechanical testing equipment specifically designed to quantify the structural stability and pressure resistance performance of hollow fiber membrane modules under external pressure loads. Its core function is to simulate the external pressure stress environment of membrane elements in actual applications, accurately apply controllable external pressure, and monitor the mechanical response and failure behavior of the membrane during pressure loading. This provides quantitative data support for material selection, structural optimization, and reliability assessment of hollow fiber membranes in engineering applications.

[0003] A search revealed that patent document CN115356211B discloses a hollow fiber membrane external pressure resistance testing device and method, comprising a transparent tube with upper and lower openings; a first sealing plug connected to the upper opening of the transparent tube, the first sealing plug having a water injection pipe, the first end of the water injection pipe being connected to the inside of the transparent tube; a second sealing plug connected to the lower opening of the transparent tube; and at least two support rods, each support rod having its first end fixed to the first sealing plug and its second end connected to the second sealing plug. This invention utilizes the transparent tube to construct a test space, and by injecting water into the transparent tube, the hollow fiber membrane under test is subjected to an external pressure resistance test within the transparent tube. In particular, it can simulate the pressure resistance performance of the entire hollow fiber membrane in a permeable state during the initial operation of the filter membrane, to determine whether it resists pressure or detaches under a preset pressure. In real-world applications, most devices lack optimized control over the fluid state within the membrane, making it difficult to simulate the coupling effect between the internal and external fluids during actual operation. The test scenarios deviate significantly from actual applications. Furthermore, some testing devices can only test a single membrane filament, resulting in low testing efficiency. They also cannot monitor and precisely control key parameters in real time during the testing process, making it difficult to meet the high efficiency and accuracy requirements for hollow fiber membrane performance testing in industrial production. Summary of the Invention

[0004] The purpose of this invention is to address the problems mentioned in the background section by providing a device and method for testing the external pressure resistance of hollow fiber membranes.

[0005] To achieve the above objectives, the present invention adopts the following technical solutions: A hollow fiber membrane external pressure resistance testing device includes: a base, a testing mechanism on the base, a pressurizing mechanism on one side of the testing mechanism, and a control console body fixedly connected to the base; The testing mechanism includes a sealed tank fixed to a base. The inner wall of the sealed tank has multiple drainage holes arranged in an array. Both sides of the sealed tank are provided with baffles fixed to the base. Electric telescopic rod 1 is fixedly connected to the middle of the two baffles that are close to each other. The telescopic ends of the two electric telescopic rod 1 are fixedly connected to a moving frame. Electric telescopic rod 2 is fixedly connected to the two moving frames that are close to each other. The telescopic ends of the two electric telescopic rod 2 are fixedly connected to a sealing plate. Sealing rings are arranged in an array on the outer surface of the sealing plate. Sealing airbags are embedded in the outer surface of the sealing plate. Multiple fixing components are arranged in an array on the side of the two sealing plates that are close to each other.

[0006] Preferably, a water storage tank is provided below the base, the drain hole is connected to the water storage tank, and a solenoid valve is provided at the connection between the drain hole and the water storage tank.

[0007] Preferably, the fixing assembly includes a fixing frame fixed to the sealing plate. Multiple rectangular slots are arrayed at the end of the fixing frame away from the sealing plate. A hydraulic telescopic rod is fixedly connected to the sealing plate. A spray nozzle is fixedly connected to the telescopic end of the hydraulic telescopic rod. A movable frame is slidably connected to the outer surface of the hydraulic telescopic rod. An electromagnetic ring is fixedly connected to the end of the movable frame near the fixing frame. A permanent magnet ring is fixedly connected to the outer surface of the hydraulic telescopic rod on the side of the electromagnetic ring near the fixing frame. Connecting rods are rotatably connected to the outer surface of the movable frame. Clamping plates are slidably connected within the rectangular slots. Multiple connecting rods are rotatably connected to multiple clamping plates respectively.

[0008] Preferably, an elastic element is provided between the clamping plate and the inner wall of the fixing frame, and the elastic element always has a force that pushes the multiple clamping plates away from each other.

[0009] Preferably, the pressurizing mechanism includes a liquid pump fixed to the base, a connecting column fixed to the base on the side of the liquid pump near the main body of the control console, a pressure regulating component above the liquid pump, a motor fixedly connected to the baffle, a support frame above the motor, the support frame being fixedly connected to multiple spray heads via a hose, multiple adjusting components arrayed inside the support frame, an M-shaped tube fixedly connected to the outer surface of the support frame, a diversion pipe between the M-shaped tube and the pressure regulating component, the diversion pipe being connected to the M-shaped tube, the input end of the liquid pump and the connecting column being connected to the water storage tank, and the diversion pipe being directly connected to the sealing plate via a hose.

[0010] Preferably, the pressure regulating assembly includes a sealing tube fixed to a baffle plate, a connecting ring fixedly connected to the outer surface of the sealing tube, a fixed tube fixedly connected inside the sealing tube, a plurality of open slots arrayed on the outer surface of the fixed tube, a movable cover slidably connected to the outer surface of the fixed tube, a hydraulic telescopic rod II fixedly connected between the movable cover and the inner wall of the sealing tube, a connecting tube fixedly connected to one end of the fixed tube near the hydraulic telescopic rod II, and the connecting tube extending through to the outside of the sealing tube and fixedly connected to the diverter tube.

[0011] Preferably, the output end of the pump is fixedly connected to the sealing tube, and the connecting ring is fixedly connected to the connecting column.

[0012] Preferably, the adjustment assembly includes an adjustment column rotatably connected to a support frame, the outer surface of the adjustment column having an array of square slots, a square frame fixedly connected to the inner cavity of the adjustment column, an array of electromagnetic blocks fixedly connected to the outer surface of the square frame, a permanent magnet block being provided on the side of the electromagnetic blocks that is far apart from each other, an adjustment plate being slidably connected in the square slots, and the permanent magnet blocks being fixedly connected to the adjustment plates respectively.

[0013] Preferably, the plurality of adjusting columns are fixedly connected, and the adjusting column located at the bottom is fixedly connected to the motor.

[0014] A test method for a hollow fiber membrane resistance to external pressure test device is also disclosed. The specific test steps are as follows: S1, fix the membrane body, start the electric telescopic rod to pull open the moving frame, insert the liquid spray head into the hollow fiber membrane, and drive the clamping plate to clamp the membrane body through the connecting rod, and keep it relaxed; S2, Sealed cavity, electric telescopic rod pushes the sealing plate to fit the sealed tank, sealing airbag inflates and seals; S3. Pressure test: The liquid pump draws liquid, and after the pressure is adjusted by the pressure regulating component, it is divided into two paths. One path pressurizes the outside of the membrane, and the other path sprays out from the inside of the membrane through the spray head. The regulating component optimizes the fluid state. S4. Monitoring and Adjustment: The main console collects data in real time, and the operator adjusts the pressure to complete the test.

[0015] Compared with existing technologies, the advantages of this hollow fiber membrane external pressure resistance testing device and method are as follows: 1. This invention uses a motor to drive the adjustment column to rotate, and the extension length of the adjustment plate is adjusted by the magnetic force of the electromagnetic block and the permanent magnet block. This dynamically optimizes the fluid flow cross section and ensures stable pipeline pressure. At the same time, the spray head can move inside the membrane and achieve uniform spraying. This not only avoids the impact of excessive fluid velocity inside the membrane on the test pressure, but also simulates the usage state of hollow fiber membrane under different flow rate conditions, making the test scenario more in line with actual applications and further improving the reference value of the test results. Furthermore, by adjusting the sliding position of the movable cover through the hydraulic telescopic rod, the exposed area of ​​the open slot on the fixed tube is changed, thereby precisely controlling the fluid resistance and output pressure to achieve a step-by-step increase or constant maintenance of pressure.

[0016] 2. This invention achieves flexible clamping of hollow fiber membranes through a fixing component. The repulsive force between the electromagnetic ring and the permanent magnet ring, combined with the connecting rod, drives the clamping plate to approach synchronously. Combined with the spray head, it forms a multi-point uniform fixation. At the same time, the elastic element can avoid excessive clamping force from damaging the membrane. During the fixing process, the membrane always remains in a natural relaxed state, effectively eliminating the interference of additional tensile stress on the test results and ensuring that the test data can truly reflect the membrane's resistance to external pressure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a hollow fiber membrane external pressure resistance testing device provided by the present invention; Figure 2 This is a schematic diagram of the overall internal structure of a hollow fiber membrane external pressure resistance testing device provided by the present invention; Figure 3 This is a schematic diagram of the internal structure of the testing mechanism of a hollow fiber membrane external pressure resistance testing device provided by the present invention; Figure 4 This is a schematic diagram of the detection mechanism of a hollow fiber membrane external pressure resistance testing device provided by the present invention; Figure 5 This is a schematic diagram of the fixed component structure of a hollow fiber membrane external pressure resistance testing device provided by the present invention.

[0018] Figure 6 This is a schematic diagram of the pressurization mechanism position structure of a hollow fiber membrane external pressure resistance testing device provided by the present invention; Figure 7 This is a schematic diagram of the pressurization mechanism of a hollow fiber membrane external pressure resistance testing device provided by the present invention; Figure 8 This is a schematic diagram of the internal structure of the pressure regulating component of a hollow fiber membrane external pressure resistance testing device provided by the present invention; Figure 9 This is a schematic diagram of the internal structure of the adjustment component of a hollow fiber membrane external pressure resistance testing device provided by the present invention.

[0019] In the diagram: 1. Base; 2. Detection mechanism; 3. Pressurization mechanism; 4. Control console body; 20. Fixing component; 21. Sealing tank; 22. Drain hole; 23. Baffle; 24. Electric telescopic rod one; 25. Moving frame; 26. Electric telescopic rod two; 27. Sealing plate; 28. Sealing ring; 29. ​​Sealing airbag; 201. Fixing frame; 202. Rectangular groove; 203. Hydraulic telescopic rod one; 204. Spray head; 205. Movable frame; 206. Electromagnetic ring; 207. Permanent magnet ring; 208. Connecting rod ; 209, Clamping plate; 31, Liquid pump; 32, Connecting column; 33, Pressure regulating assembly; 34, Motor; 35, Support frame; 36, Adjusting assembly; 37, M-shaped tube; 38, Diverter tube; 331, Sealing tube; 332, Connecting ring; 333, Fixed tube; 334, Open slot; 335, Movable cover; 336, Hydraulic telescopic rod II; 337, Connecting tube; 361, Adjusting column; 362, Square slot; 363, Square frame; 364, Electromagnetic block; 365, Permanent magnet block; 366, Adjusting plate. Detailed Implementation

[0020] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0021] Example: Refer to Figures 1 to 9 A hollow fiber membrane external pressure resistance testing device and method includes a base 1, a testing mechanism 2 on the base 1, a pressurizing mechanism 3 on one side of the testing mechanism 2, and a control console body 4 fixedly connected to the base 1.

[0022] To further explain, the following settings are made to provide a better testing environment for the device, such as... Figure 3 and Figure 4 As shown, the testing mechanism 2 includes a sealed tank 21 fixed on the base 1. The inner wall of the sealed tank 21 is provided with multiple drain holes 22. A water storage tank is provided below the base 1. The drain holes 22 are connected to the water storage tank. A solenoid valve is provided at the connection between the drain holes 22 and the water storage tank. Baffles 23 fixed on the base 1 are provided on both sides of the sealed tank 21. Electric telescopic rod 24 is fixedly connected to the middle of the two baffles 23 at their close ends. Movable frame 25 is fixedly connected to the telescopic ends of the two electric telescopic rods 24. Electric telescopic rod 26 is fixedly connected to the two movable frames 25 at their close ends. Sealing plate 27 is fixedly connected to the telescopic ends of the two electric telescopic rods 26. Sealing rings 28 are provided in an array on the outer surface of the sealing plate 27. Sealing airbags 29 are embedded in the outer surface of the sealing plate 27. Multiple fixing components 20 are provided in an array on the side of the two sealing plates 27 that are close to each other.

[0023] To further explain, the following settings are made to clamp and fix the hollow fiber membrane, such as... Figure 5As shown, the fixing assembly 20 includes a fixing frame 201 fixed to the sealing plate 27. The fixing frame 201 has multiple rectangular slots 202 arrayed at one end away from the sealing plate 27. A hydraulic telescopic rod 203 is fixedly connected to the sealing plate 27. A spray head 204 is fixedly connected to the telescopic end of the hydraulic telescopic rod 203. A movable frame 205 is slidably connected to the outer surface of the hydraulic telescopic rod 203. An electromagnetic ring 206 is fixedly connected to one end of the movable frame 205 near the fixing frame 201. A permanent magnet ring 207 is fixedly connected to the outer surface of the hydraulic telescopic rod 203 on the side of the electromagnetic ring 206 near the fixing frame 201. Connecting rods 208 are rotatably connected to the outer surface of the movable frame 205. Clamping plates 209 are slidably connected in the rectangular slots 202. Multiple connecting rods 208 are rotatably connected to multiple clamping plates 209 respectively. An elastic element is provided between the clamping plates 209 and the inner wall of the fixing frame 201. The elastic element always has a force that pushes the multiple clamping plates 209 in a direction away from each other.

[0024] To further explain, the following settings are implemented to facilitate better testing by testing agency 2, such as... Figure 6 and Figure 7 As shown, the pressurizing mechanism 3 includes a pump 31 fixed on the base 1. A connecting column 32 fixed on the base 1 is provided on the side of the pump 31 near the main body 4 of the control console. A pressure regulating component 33 is provided above the pump 31. A motor 34 is fixedly connected to the baffle 23. A support frame 35 is provided above the motor 34. The support frame 35 is fixedly connected to multiple spray heads 204 by a hose. Multiple adjusting components 36 are arrayed inside the support frame 35. An M-shaped tube 37 is fixedly connected to the outer surface of the support frame 35. A diversion pipe 38 is provided between the M-shaped tube 37 and the pressure regulating component 33. The diversion pipe 38 is connected to the M-shaped tube 37. The input end of the pump 31 and the connecting column 32 are connected to the water storage tank. The diversion pipe 38 is directly connected to the sealing plate 27 by a hose.

[0025] To further explain, the following settings are made to adjust the external pressure on the hollow fiber membrane, such as... Figure 8 As shown, the pressure regulating component 33 includes a sealing tube 331 fixed on the baffle 23. A connecting ring 332 is fixedly connected to the outer surface of the sealing tube 331. The output end of the pump 31 is fixedly connected to the sealing tube 331. The connecting ring 332 is fixedly connected to the connecting column 32. A fixed tube 333 is fixedly connected inside the sealing tube 331. Multiple open slots 334 are arrayed on the outer surface of the fixed tube 333. A movable cover 335 is slidably connected to the outer surface of the fixed tube 333. A hydraulic telescopic rod 336 is fixedly connected between the movable cover 335 and the inner wall of the sealing tube 331. A connecting tube 337 is fixedly connected to one end of the fixed tube 333 near the hydraulic telescopic rod 336. The connecting tube 337 extends through the sealing tube 331 and is fixedly connected to the diversion tube 38.

[0026] To further explain, the following settings are implemented to better simulate the usage of hollow fiber membranes, such as... Figure 9 As shown, the adjustment assembly 36 includes an adjustment column 361 rotatably connected to the support frame 35, multiple adjustment columns 361 are fixedly connected, the lowest adjustment column 361 is fixedly connected to the motor 34, multiple square slots 362 are arrayed on the outer surface of the adjustment column 361, a square frame 363 is fixedly connected to the inner cavity of the adjustment column 361, multiple electromagnetic blocks 364 are arrayed and fixedly connected to the outer surface of the square frame 363, permanent magnet blocks 365 are provided on the side of the multiple electromagnetic blocks 364 that are far apart from each other, an adjustment plate 366 is slidably connected in the square slot 362, and multiple permanent magnet blocks 365 are fixedly connected to multiple adjustment plates 366 respectively.

[0027] The functional principle of this invention can be explained through the following operation: During testing, two electric telescopic rods 24 are first activated to pull two movable frames 25 in a direction away from each other. Then, one end of the hollow fiber membrane used for testing is fixed. Next, the electric telescopic rods 24 and 26 are moved again to push the sealing plate 27 on that side towards the other sealing plate 27. Then, the other end of the hollow fiber membrane used for testing is fixed. By moving the sealing plates 27, the hollow fiber membrane is not stretched before testing, keeping it in an unused state, ensuring the accuracy of subsequent testing. Furthermore, since the sealing tank 21 cannot be disassembled, it is more convenient to clamp and fix the hollow fiber membrane. When clamping and fixing the hollow fiber membrane, the hydraulic telescopic rod 203 needs to be activated to push the spray head 204 to move away from the fixed frame 201. Then, the spray head 204 is inserted into the hollow fiber membrane. At this time, the electromagnetic ring 206 is energized. It should be noted that the electromagnetic ring 206 and the permanent magnet ring 207 are magnetically repelled. When the electromagnetic ring 206 is energized, it will generate a magnetic force, which will push the movable frame 205 to move away from the fixed frame 201. During the movement of the movable frame 205, it will drive multiple clamping plates 209 to move towards each other through the connecting rod 208 until multiple clamping plates 209 simultaneously contact the outer surface of the hollow fiber membrane, so that the spray head 204 can work together to clamp and fix the hollow fiber membrane. Throughout the clamping and fixing process, it is necessary to ensure that the hollow fiber membrane remains in a naturally relaxed state to prevent additional tensile stress from interfering with the test results. After clamping, the electric telescopic rod 26 pushes the sealing plate 27 toward the port of the sealing tank 21 until the sealing ring 28 fits tightly. Then, the sealing airbag 29 inflates and fills the gap between the sealing plate 27 and the sealing tank 21, creating a test chamber with excellent airtightness. This provides a solid protective foundation for subsequent pressure testing. The spray head 204 consists of a fixed ring and a spray head plate. An elastic telescopic component is provided between the fixed ring and the spray head plate. Multiple clamping plates 209 and the fixed ring fix the hollow fiber membrane, so that while the hollow fiber membrane is clamped and fixed, the hydraulic telescopic rod 203 can also drive the spray head plate to move inside the hollow fiber membrane. The outer surface of the spray head plate is provided with a fixing airbag, which can seal the hollow fiber membrane, so that the liquid entering the hollow fiber membrane can only flow between the two spray head plates. During the testing phase, the main control unit 4 issues a command to start the pump 31. The fluid drawn from the storage tank is transported through pipelines to the sealing pipe 331 of the pressure regulating component 33. The hydraulic telescopic rod 336 adjusts the sliding position of the movable cover 335 along the fixed pipe 333, precisely controlling the fluid resistance by changing the exposed area of ​​the open groove 334, thus achieving on-demand adjustment of the output pressure. (In the pressure regulating component 33, the open groove 334 on the outer surface of the fixed pipe 333 is the main flow channel for the fluid. When the movable cover 335 slides along the fixed pipe 333, it changes the coverage of the open groove 334, thereby adjusting the effective exposed area of ​​the open groove 334. When the exposed area of ​​the open groove 334 is large and the resistance is small, the fluid...) It can quickly enter the subsequent pipeline through the open slot, and no obvious pressure accumulation will form in the system. The final output external pressure to the hollow fiber membrane is relatively low. However, when the exposed area of ​​the open slot 334 is small and the resistance is high, the fluid flow rate slows down. The fluid continuously input by the pump 31 will cause congestion in the sealed pipe 331 and the front-end pipeline, forming pressure accumulation. The greater the resistance, the higher the accumulated pressure, and the final external pressure transmitted to the hollow fiber membrane will also increase. Resistance and pressure are positively correlated. After the pressure fluid is regulated, it enters the diversion pipe 38 through the connecting pipe 337 and is divided into two paths. One path directly enters the sealed cavity of the sealed tank 21 and applies a uniform and stable external pressure to the outer surface of the hollow fiber membrane. Another path transports fluid to the support frame 35 via the M-shaped tube 37. The motor 34 drives multiple fixedly connected adjusting columns 361 to rotate. With the help of the magnetic force of the electromagnetic block 364 and the permanent magnet block 365, the extension length of the adjusting plate 366 in the square groove 362 is adjusted, dynamically optimizing the fluid flow cross section and ensuring the stability of the pipeline pressure. At the same time, some fluid is transported to the spray head 204 through the hose and sprayed out from inside the membrane, which can balance the temperature difference inside and outside the membrane and create a stable test environment. Moreover, the medium flowing into the hollow fiber membrane will not impact the external pressure due to the high flow rate, thus ensuring the accuracy of the device during testing. It can also simulate the different states of the hollow fiber tube during daily use according to different flow rates, thereby better detecting the hollow fiber membrane's resistance to external pressure. During the test, the main body of the control console 4 collects feedback data from pressure sensors, sealing detection sensors, etc. in real time, clearly presenting key parameters such as the current external pressure value, cavity sealing status, and fluid flow rate. The operator can adjust the power of the pump 31 or the stroke of the pressure regulating component 33 to achieve a step-by-step increase or constant maintenance of the external pressure to meet the needs of different test conditions. It should be noted that the liquid medium used for testing is deionized water, which cannot penetrate the intact membrane wall unless the membrane has specific permeation channels. Therefore, the medium used for pressurization and the medium inside the hollow fiber membrane cannot penetrate its gaps. The light emitting and receiving devices are located in section 204 inside the hollow fiber membrane. The distance the light travels determines whether the hollow fiber membrane is saturated. Due to varying amounts of medium flowing within the hollow fiber membrane, incomplete saturation may occur, affecting the accuracy of the test. This can be mitigated by moving the spray head inside section 204, thereby reducing the volume inside the hollow fiber membrane. This maintains the membrane's saturation without affecting the internal pressure, effectively simulating real-life scenarios involving hollow fiber membranes and further improving the test accuracy.

[0028] A test method for the above-mentioned hollow fiber membrane external pressure resistance test device, the specific test steps are as follows: S1. Fix the membrane body, start the electric telescopic rod 24 to pull the movable frame 25 to separate, put the two ends of the hollow fiber membrane onto the spray head 204 respectively, energize the electromagnetic ring 206, and use its repulsive force with the permanent magnet ring 207 to push the movable frame 205 to move. Through the connecting rod 208, drive the clamping plate 209 to cooperate with the spray head 204 to clamp the membrane body, ensuring that the membrane is in a natural relaxed state. S2, sealed cavity, electric telescopic rod 26 pushes sealing plate 27 to fit the port of sealed tank 21, sealing ring 28 fits tightly, sealing airbag 29 inflates to fill the gap, and a sealed test cavity is constructed; S3. Pressure test: The pump 31 draws fluid from the water storage tank and delivers it to the sealing pipe 331 of the pressure regulating component 33. The hydraulic telescopic rod 336 adjusts the position of the movable cover 335 and regulates the pressure by changing the exposed area of ​​the open slot 334 on the fixed pipe 333. The fluid enters the diversion pipe 38 through the connecting pipe 337 and is divided into two paths. One path directly enters the sealing tank 21 to pressurize the outer surface of the membrane, and the other path is delivered to the support frame 35 through the M-shaped pipe 37. The motor 34 drives the adjusting column 361 to rotate. The extension length of the adjusting plate 366 is adjusted by the magnetic force of the electromagnetic block 364 and the permanent magnet block 365 to optimize the fluid flow. Some fluid is delivered to the spray head 204 through the hose and sprayed out from inside the membrane to simulate different usage scenarios. S4. Monitoring and Adjustment: The main body of the control console 4 collects data such as pressure and sealing status in real time. The operator can adjust the power of the pump 31 or the stroke of the pressure regulating component 33 to achieve step-by-step increase or constant maintenance of external pressure and complete the external pressure resistance test.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hollow fiber membrane external pressure resistance testing device, characterized in that, include: The base (1) is provided with a detection mechanism (2), and a pressure mechanism (3) is provided on one side of the detection mechanism (2). The main body of the control console (4) is fixedly connected to the base (1). The detection mechanism (2) includes a sealed tank (21) fixed on the base (1). The inner wall of the sealed tank (21) is provided with multiple drain holes (22). The two sides of the sealed tank (21) are provided with baffles (23) fixed on the base (1). The middle of the two baffles (23) that are close to each other is fixedly connected to an electric telescopic rod (24). The telescopic ends of the two electric telescopic rods (24) are fixedly connected to a moving frame (25). The two moving frames (25) are fixedly connected to an electric telescopic rod (26) that are close to each other. The telescopic ends of the two electric telescopic rods (26) are fixedly connected to a sealing plate (27). The outer surface of the sealing plate (27) is provided with a sealing ring (28). The outer surface of the sealing plate (27) is embedded with a sealing airbag (29). The two sealing plates (27) are provided with multiple fixing components (20) on the side that are close to each other.

2. The hollow fiber membrane external pressure resistance testing device according to claim 1, characterized in that, A water storage tank is provided below the base (1), and the drain hole (22) is connected to the water storage tank. A solenoid valve is provided at the connection between the drain hole (22) and the water storage tank.

3. The hollow fiber membrane external pressure resistance testing device according to claim 1, characterized in that, The fixing assembly (20) includes a fixing frame (201) fixed to the sealing plate (27). The fixing frame (201) has multiple rectangular slots (202) arranged in an array at one end away from the sealing plate (27). A hydraulic telescopic rod (203) is fixedly connected to the sealing plate (27). A spray head (204) is fixedly connected to the telescopic end of the hydraulic telescopic rod (203). A movable frame (205) is slidably connected to the outer surface of the hydraulic telescopic rod (203). An electromagnetic ring (206) is fixedly connected to one end of the fixed frame (201). The electromagnetic ring (206) is provided with a permanent magnet ring (207) fixedly connected to the outer surface of the hydraulic telescopic rod (203) on the side of the fixed frame (201). The outer surface of the movable frame (205) is rotatably connected with connecting rods (208). A clamping plate (209) is slidably connected in the rectangular groove (202). The multiple connecting rods (208) are rotatably connected to the multiple clamping plates (209) respectively.

4. The hollow fiber membrane external pressure resistance testing device according to claim 3, characterized in that, An elastic element is provided between the clamping plate (209) and the inner wall of the fixing frame (201), and the elastic element always has a force to push the multiple clamping plates (209) in a direction away from each other.

5. The hollow fiber membrane external pressure resistance testing device according to claim 3, characterized in that, The pressurizing mechanism (3) includes a pump (31) fixed on the base (1). The pump (31) has a connecting column (32) fixed on the base (1) on one side near the control panel (4). A pressure regulating component (33) is provided above the pump (31). A motor (34) is fixedly connected to the baffle (23). A support frame (35) is provided above the motor (34). The support frame (35) is fixed with multiple spray nozzles (204) by a hose. The support frame (35) is provided with multiple adjustment components (36) arranged in an array. The outer surface of the support frame (35) is fixedly connected to an M-shaped tube (37). A diversion pipe (38) is provided between the M-shaped tube (37) and the pressure regulating component (33). The diversion pipe (38) is connected to the M-shaped tube (37). The input end of the liquid pump (31) and the connecting column (32) are connected to the water storage tank. The diversion pipe (38) is directly connected to the sealing plate (27) by a flexible hose.

6. The hollow fiber membrane external pressure resistance testing device according to claim 5, characterized in that, The pressure regulating component (33) includes a sealing tube (331) fixed on a baffle (23). A connecting ring (332) is fixedly connected to the outer surface of the sealing tube (331). A fixed tube (333) is fixedly connected inside the sealing tube (331). Multiple open slots (334) are arrayed on the outer surface of the fixed tube (333). A movable cover (335) is slidably connected to the outer surface of the fixed tube (333). A hydraulic telescopic rod (336) is fixedly connected between the movable cover (335) and the inner wall of the sealing tube (331). A connecting tube (337) is fixedly connected to one end of the fixed tube (333) near the hydraulic telescopic rod (336). The connecting tube (337) extends through the sealing tube (331) and is fixedly connected to the diverter tube (38).

7. The hollow fiber membrane external pressure resistance testing device according to claim 6, characterized in that, The output end of the pump (31) is fixedly connected to the sealing tube (331), and the connecting ring (332) is fixedly connected to the connecting column (32).

8. The hollow fiber membrane external pressure resistance testing device according to claim 5, characterized in that, The adjustment assembly (36) includes an adjustment column (361) rotatably connected to the support frame (35). The outer surface of the adjustment column (361) is provided with a plurality of square slots (362). The inner cavity of the adjustment column (361) is fixedly connected to a square frame (363). The outer surface of the square frame (363) is fixedly connected to a plurality of electromagnetic blocks (364). The sides of the plurality of electromagnetic blocks (364) that are far apart from each other are provided with permanent magnet blocks (365). An adjustment plate (366) is slidably connected in the square slot (362). The plurality of permanent magnet blocks (365) are fixedly connected to the plurality of adjustment plates (366) respectively.

9. The hollow fiber membrane external pressure resistance testing device according to claim 8, characterized in that, Multiple adjustment columns (361) are fixedly connected, and the lowest adjustment column (361) is fixedly connected to the motor (34).

10. The test method of the hollow fiber membrane external pressure resistance test device according to any one of claims 1-9, characterized in that, The specific testing steps are as follows: S1. Fix the membrane body, start the electric telescopic rod (24) to pull open the moving frame (25), insert the spray head (204) into the hollow fiber membrane, and drive the clamping plate (209) to clamp the membrane body through the connecting rod (208) and keep it loose; S2, a sealed cavity, wherein the electric telescopic rod (26) pushes the sealing plate (27) to fit against the sealed tank (21), and the sealing airbag (29) is inflated and sealed; S3, pressure test: the pump (31) draws liquid, and after the pressure is adjusted by the pressure regulating component (33), it is divided into two paths: one path pressurizes the outside of the membrane, and the other path sprays out from the inside of the membrane through the spray head (204). The regulating component (36) optimizes the fluid state. S4. Monitoring and adjustment: The main body of the control console (4) collects data in real time, and the operator adjusts the pressure to complete the test.

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