Device for testing permeability of nanofiltration separation membrane

Abstract

The invention belongs to the technical field of permeability testing, and particularly relates to a nanofiltration separation membrane permeability testing device which comprises a bottom frame and a plurality of liquid inlet pipes, the upper side of the bottom frame is fixedly connected with a lower support, the upper side of the lower support is fixedly connected with a plurality of lower cylindrical shell units, and the upper side of the bottom frame is fixedly connected with an upper support. A plurality of lifting mechanisms are fixedly connected to the upper support, upper cylindrical shell units matched with the lower cylindrical shell units are fixedly connected to the multiple lifting mechanisms, and the lower cylindrical shell units and the upper cylindrical shell units are half shells. The lower cylindrical shell unit and the upper cylindrical shell unit are spliced to form a cylindrical shell unit, and the upper side of the bottom frame is further fixedly connected with a plurality of independent lifting supports arranged side by side. According to the invention, the permeability of the nano-filtration separation membrane in an arc state under different conditions can be simply tested.

Description

Technical Field

[0001] This invention belongs to the field of permeation performance testing technology, and specifically relates to a nanofiltration membrane permeation performance testing device. Background Technology

[0002] In fields such as water purification, seawater desalination, and biopharmaceutical purification, nanofiltration membranes have become key materials due to their precise retention characteristics for substances with specific molecular weights. The permeation performance of nanofiltration membranes (including water flux and solute rejection rate) directly determines their application effects and industrial suitability. Therefore, before membrane material research and development, production quality control, and engineering applications, it is necessary to accurately evaluate their permeation performance using professional testing equipment.

[0003] Currently, most mainstream nanofiltration membrane permeation performance testing devices adopt planar membrane testing structures. This involves fixing the membrane in a planar fixture, passing in the test solution, and monitoring the permeation parameters. While these devices are easy to operate, they differ significantly from actual industrial applications. In industry, nanofiltration membranes are often assembled into membrane modules using spiral wound or tubular structures. The permeation performance (such as pore distribution and mass transfer resistance) of the membrane under arc-shaped stress conditions deviates significantly from that in a planar state. This results in planar test data failing to accurately reflect the actual operating performance of the membrane module, misleading engineering design and membrane material selection. Summary of the Invention

[0004] The purpose of this invention is to provide a nanofiltration membrane permeation performance testing device that can relatively easily test the permeation performance of a nanofiltration membrane in an arc-shaped state under different conditions.

[0005] The specific technical solution adopted by this invention is as follows: A nanofiltration membrane permeation performance testing device includes a base frame and multiple inlet pipes. A lower support is fixedly connected to the upper side of the base frame, and multiple lower cylindrical shell units are fixedly connected to the upper side of the lower support. An upper support is fixedly connected to the upper side of the base frame, and multiple lifting mechanisms are fixedly connected to the upper support. Each of the multiple lifting mechanisms has an upper cylindrical shell unit that is adapted to the lower cylindrical shell units. Both the lower and upper cylindrical shell units are semi-shells, and the lower and upper cylindrical shell units are assembled into a single cylindrical shell unit. The upper side of the base frame is also fixedly connected to multiple independent lifting brackets arranged side by side. The upper side of each of the multiple independent lifting brackets is fixedly connected to a liquid inlet pipe located between the lower cylindrical shell unit and the upper cylindrical shell unit. One end of the liquid inlet pipe is a water inlet. Multiple liquid outlet holes are opened on the pipe body located between the lower cylindrical shell unit and the upper cylindrical shell unit. A liquid outlet pipe is fixedly connected to the lower cylindrical shell unit. Semi-circular mounting holes are opened at positions close to each other at the ends of the lower cylindrical shell unit and the upper cylindrical shell unit. Two semi-circular mounting holes are combined to form a circular mounting hole. The liquid outlet pipe is located inside the circular mounting hole.

[0006] Furthermore, both the lower cylindrical housing unit and the upper cylindrical housing unit are equipped with two pressure shafts located outside the semi-circular mounting holes on their inner sides.

[0007] Furthermore, two rotating rods are rotatably connected to the inner walls at both ends of the semi-shell. An end bracket is fixedly connected to the outer side of the rotating rod. The end bracket is connected to the pressure shaft. A torsion spring is fixedly connected between the end bracket and the inner wall of the semi-shell. The torsion spring is sleeved on the outer side of the rotating rod.

[0008] Furthermore, the end bracket includes a guide cylindrical housing unit, and both the rotating rod and the lower cylindrical housing unit are fixedly connected to the guide cylindrical housing unit. A second electromagnet is fixedly connected to one end inside the guide cylindrical housing unit, and a sliding rod is slidably connected inside the guide cylindrical housing unit. A second magnet is fixedly connected to one end of the sliding rod. When the second electromagnet is energized, the second magnet and the second magnet repel each other magnetically. The sliding rod and the pressure shaft are rotatably connected.

[0009] The technical effects achieved by this invention are as follows: The nanofiltration membrane permeation performance testing device of the present invention, through the combination of a lower cylindrical shell unit, an upper cylindrical shell unit and an inlet pipe, can easily and quickly form multiple filter membrane structures with arc-shaped structures on the outside of multiple inlet pipes, thereby enabling relatively simple testing of the permeation performance of the nanofiltration membrane in the arc-shaped state under different conditions. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a front view of the structure of the present invention; Figure 3 This is a side view of the structure of the present invention; Figure 4 This is an exploded view of the cylindrical shell unit of the present invention; Figure 5 This is the present invention. Figure 4 A magnified view of a section at point A in the middle; Figure 6 This is a cross-sectional structural diagram of the cylindrical shell unit of the present invention; Figure 7 This is a side view of the cross-sectional structure of the cylindrical shell unit of the present invention; Figure 8 This is a schematic diagram of the structure of the electric heating rod of the present invention; Figure 9 This is the present invention. Figure 8 A magnified view of a section at point B in the middle; Figure 10 This is the present invention. Figure 8 A schematic diagram of the cross-sectional structure at point B.

[0011] The attached diagram lists the components represented by each number as follows: 1. Base frame; 2. Lower support; 3. Liquid outlet pipe; 4. Upper support; 5. Lower cylindrical shell unit; 6. Upper cylindrical shell unit; 7. Nanofiltration membrane; 8. Liquid inlet pipe; 9. Liquid outlet hole; 10. Guide frame; 11. Lifting frame; 12. First electromagnet; 13. First magnet; 14. Electric heating rod; 15. Pressure shaft; 16. End support; 17. End arc ring; 18. Arc groove; 19. Arc sealing strip; 20. Guide cylindrical shell unit; 21. Slide rod; 22. Second electromagnet; 23. Second magnet; 24. Rotating rod; 25. Torsion spring; 26. Arc-shaped part of the membrane; 27. Electric telescopic rod. Detailed Implementation

[0012] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention.

[0013] like Figures 1-10 As shown, a nanofiltration membrane permeation performance testing device includes a base frame 1 and multiple inlet pipes 8. A lower support 2 is fixedly connected to the upper side of the base frame 1, and multiple lower cylindrical shell units 5 are fixedly connected to the upper side of the lower support 2. An upper support 4 is fixedly connected to the upper side of the base frame 1, and multiple lifting mechanisms are fixedly connected to the upper support 4. Each of the multiple lifting mechanisms is fixedly connected to an upper cylindrical shell unit 6 that is compatible with the lower cylindrical shell unit 5. The lower cylindrical shell unit 5 and the upper cylindrical shell unit 6 can be assembled into a complete cylindrical shell unit. In some specific embodiments, the lifting mechanism can be an electric telescopic rod 27 fixedly connected to the upper bracket 4. The piston rod of the electric telescopic rod 27 is fixedly connected to the upper cylindrical housing unit 6. Activating the electric telescopic rod 27 can drive the upper cylindrical housing unit 6 to lift.

[0014] The upper side of the base frame 1 is also fixedly connected to multiple independent lifting brackets arranged side by side. The upper side of each of the multiple independent lifting brackets is fixedly connected to an inlet pipe 8 located between the lower cylindrical shell unit 5 and the upper cylindrical shell unit 6. One end of the inlet pipe 8 is a water inlet. Multiple outlet holes 9 are opened on the pipe body of the inlet pipe 8 located between the lower cylindrical shell unit 5 and the upper cylindrical shell unit 6. An outlet pipe 3 is fixedly connected to the lower cylindrical shell unit 5. Semi-circular mounting holes are opened at the positions close to each other at the ends of the lower cylindrical shell unit 5 and the upper cylindrical shell unit 6. Two semi-circular mounting holes can be combined to form a circular mounting hole. The outlet pipe 3 is located inside the circular mounting hole. In use, a nanofiltration membrane 7 is laid flat on the upper side of multiple lower cylindrical housing units 5, and the nanofiltration membrane 7 is located on the lower side of multiple liquid inlet pipes 8. Then, multiple independent lifting supports are activated in sequence from left to right to drive multiple liquid inlet pipes 8 to descend in sequence, so that the liquid inlet pipes 8 and the lower cylindrical housing units 5 squeeze the nanofiltration membrane 7, and extrude the membrane arc-shaped portions 26 located on the lower cylindrical housing units 5 on the nanofiltration membrane 7. Another nanofiltration membrane 7 is placed on top of multiple inlet pipes 8. Then, multiple electric telescopic rods 27 are activated sequentially from left to right, causing multiple upper cylindrical housing units 6 to descend sequentially. The upper cylindrical housing units 6 squeeze the nanofiltration membrane 7 on the top of the inlet pipes 8, squeezing out multiple membrane arc-shaped portions 26 located inside the upper cylindrical housing units 6 on the second nanofiltration membrane 7. The membrane arc-shaped portions 26 inside the lower cylindrical housing unit 5 and the upper cylindrical housing unit 6 are combined to form a ring-shaped filter membrane structure, that is, each cylindrical housing unit is equipped with a filter membrane structure. After the filter membrane structure is assembled inside the cylindrical shell unit, liquid is introduced into the multiple filter membrane structures through multiple liquid inlet pipes 8. According to the liquid inlet requirements, the raw material and liquid inlet pressure at the multiple liquid inlet pipes 8 can be adjusted. After the liquid is filtered by the filter membrane structure, it can be discharged through the liquid outlet pipe 3, so that the permeation performance of the filter membrane structure can be tested.

[0015] Meanwhile, the two nanofiltration separation membrane sheets 7 can also be a folded structure of a single long strip nanofiltration separation membrane sheet 7. After the nanofiltration separation membrane sheet 7 is folded in half, multiple electric telescopic rods 27 can be activated in sequence from right to left.

[0016] Among them, such as Figures 1-3As shown, in some embodiments, the independent lifting bracket includes a guide frame 10 and a first electromagnet 12 fixedly connected to the upper side of the base frame 1. A lifting frame 11 is vertically slidably connected to the guide frame 10. The liquid inlet pipe 8 is fixedly connected to the lifting frame 11. A first magnet 13 is fixedly connected to the lower side of the lifting frame 11. When the first electromagnet 12 is energized, it and the first magnet 13 repel each other magnetically, thereby applying an upward thrust to the lifting frame 11, causing the liquid inlet pipe 8 to move upward, so that the liquid inlet pipe 8 is separated from the lower cylindrical housing unit 5. The structure is relatively simple and the cost is low.

[0017] like Figures 4-5 As shown, both the lower cylindrical housing unit 5 and the upper cylindrical housing unit 6 are semi-shells. The front and rear ends of the semi-shells are fixedly connected with end arc rings 17 that are adapted to the semi-circular mounting holes. The end arc rings 17 enhance the sealing between the semi-shell and the diaphragm arc portion 26, thereby improving the sealing performance of the cylindrical housing unit.

[0018] Meanwhile, an arc-shaped groove 18 is provided on the inner side of the end arc ring 17, and an arc-shaped sealing strip 19 is fixedly connected inside the arc-shaped groove 18. Through the cooperation of the two arc-shaped sealing strips 19, the sealing between the half shell and the arc-shaped part of the diaphragm 26 can be further improved.

[0019] like Figures 4-8 As shown, in order to improve the temperature control effect inside the cylindrical shell unit, an electric heating rod 14 is fixedly connected inside the half shell. The electric heating rod 14 can heat the liquid inside the cylindrical shell unit to achieve temperature control. At the same time, a temperature sensor can also be installed inside the cylindrical shell unit to monitor the temperature inside the cylindrical shell unit.

[0020] like Figures 4-8 As shown, two pressure shafts 15 located outside the semi-circular mounting holes are installed on the inner sides of both the lower cylindrical housing unit 5 and the upper cylindrical housing unit 6, thereby pressing the two sides of the arc-shaped part 26 of the membrane to ensure the forming effect of the filter membrane structure outside the liquid inlet pipe 8.

[0021] In some embodiments, the pressure shaft 15 is directly fixed to the inside of the semi-shell.

[0022] like Figures 5-10As shown, in some other embodiments, two rotating rods 24 are rotatably connected to the inner walls at both ends of the semi-shell. An end bracket 16 is fixedly connected to the outer side of the rotating rod 24. The end bracket 16 is rotatably connected to the pressure shaft 15. A torsion spring 25 is fixedly connected between the end bracket 16 and the inner wall of the semi-shell. The torsion spring 25 is sleeved on the outer side of the rotating rod 24. At this time, when the liquid inlet pipe 8 and the semi-shell approach each other, the liquid inlet pipe 8 will first contact the pressure shaft 15 and push the pressure shaft 15, causing the pressure shaft 15 to rotate outward. Thus, the rotation of the pressure shaft 15 on the outside of the nanofiltration membrane 7 can be used to push the nanofiltration membrane 7, reduce the wrinkles at the arc-shaped part 26 of the membrane, and further improve the forming effect of the arc-shaped part 26 of the membrane.

[0023] like Figure 5 and Figures 9-10 As shown, the end support 16 includes a guide cylindrical housing unit 20, a rotating rod 24 and a lower cylindrical housing unit 5, all of which are fixedly connected to the guide cylindrical housing unit 20. A second electromagnet 22 is fixedly connected to one end inside the guide cylindrical housing unit 20. A slide rod 21 is slidably connected inside the guide cylindrical housing unit 20. A second magnet 23 is fixedly connected to one end of the slide rod 21. When the second electromagnet 22 is energized, the second magnet 23 repels each other magnetically. The slide rod 21 and the pressure shaft 15 are rotatably connected. At this time, by adjusting the magnetic force applied by the second electromagnet 22 to the second magnet 23, the squeezing force applied by the end support 16 to the nanofiltration membrane 7 can be controlled.

[0024] In summary, this technical solution, through the combination of the lower cylindrical shell unit 5, the upper cylindrical shell unit 6, and the liquid inlet pipe 8, can easily and quickly form multiple filter membrane structures with arc-shaped structures on the outside of multiple liquid inlet pipes 8, thereby enabling relatively simple testing of the permeation performance of the nanofiltration separation membrane 7 in the arc-shaped state under different conditions.

[0025] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A nanofiltration membrane permeation performance testing device, characterized in that: Includes a base frame (1) and multiple inlet pipes (8). A lower support (2) is fixedly connected to the upper side of the base frame (1). Multiple lower cylindrical shell units (5) are fixedly connected to the upper side of the lower support (2). An upper support (4) is fixedly connected to the upper side of the base frame (1). Multiple lifting mechanisms are fixedly connected to the upper support (4). Each of the multiple lifting mechanisms is fixedly connected to an upper cylindrical shell unit (6) that is compatible with the lower cylindrical shell unit (5). Both the lower cylindrical shell unit (5) and the upper cylindrical shell unit (6) are half shells. The lower cylindrical shell unit (5) and the upper cylindrical shell unit (6) are assembled into a cylindrical shell unit. The upper side of the base frame (1) is also fixedly connected to multiple independent lifting brackets arranged side by side. The upper side of each of the multiple independent lifting brackets is fixedly connected to an inlet pipe (8) located between the lower cylindrical shell unit (5) and the upper cylindrical shell unit (6). One end of the inlet pipe (8) is a water inlet. Multiple outlet holes (9) are opened on the pipe body of the inlet pipe (8) located between the lower cylindrical shell unit (5) and the upper cylindrical shell unit (6). An outlet pipe (3) is fixedly connected to the lower cylindrical shell unit (5). Semi-circular mounting holes are opened at the positions close to each other at the ends of the lower cylindrical shell unit (5) and the upper cylindrical shell unit (6). Two semi-circular mounting holes are combined to form a circular mounting hole. The outlet pipe (3) is located inside the circular mounting hole.

2. The nanofiltration membrane permeation performance testing device according to claim 1, characterized in that: The independent lifting bracket includes a guide frame (10) and a first electromagnet (12) fixedly connected to the upper side of the base frame (1). A lifting frame (11) is vertically slidably connected to the guide frame (10). The liquid inlet pipe (8) is fixedly connected to the lifting frame (11). A first magnet (13) is fixedly connected to the lower side of the lifting frame (11). When the first electromagnet (12) is energized, it and the first magnet (13) repel each other magnetically.

3. The nanofiltration membrane permeation performance testing device according to claim 1, characterized in that: An electric heating rod (14) is fixedly connected inside the semi-shell.

4. The nanofiltration membrane permeation performance testing device according to claim 1, characterized in that: Both the lower cylindrical housing unit (5) and the upper cylindrical housing unit (6) have two pressure shafts (15) installed on their inner sides, located outside the semi-circular mounting holes.

5. The nanofiltration membrane permeation performance testing device according to claim 4, characterized in that: Two rotating rods (24) are rotatably connected to the inner walls at both ends of the semi-shell. An end bracket (16) is fixedly connected to the outer side of the rotating rod (24). The end bracket (16) is connected to the pressure shaft (15). A torsion spring (25) is fixedly connected between the end bracket (16) and the inner wall of the semi-shell. The torsion spring (25) is sleeved on the outer side of the rotating rod (24).

6. The nanofiltration membrane permeation performance testing device according to claim 5, characterized in that: The end bracket (16) and the pressure shaft (15) are rotatably connected.

7. The nanofiltration membrane permeation performance testing device according to claim 6, characterized in that: The end bracket (16) includes a guide cylindrical housing unit (20). The rotating rod (24) and the lower cylindrical housing unit (5) are both fixedly connected to the guide cylindrical housing unit (20). A second electromagnet (22) is fixedly connected to one end inside the guide cylindrical housing unit (20). A slide rod (21) is slidably connected inside the guide cylindrical housing unit (20). A second magnet (23) is fixedly connected to one end of the slide rod (21). When the second electromagnet (22) is energized, the second magnet (23) magnetically repels each other. The slide rod (21) and the pressure shaft (15) are rotatably connected.

8. The nanofiltration membrane permeation performance testing device according to claim 1, characterized in that: Both the front and rear ends of the semi-shell are fixedly connected to an end arc ring (17) that is adapted to the semi-circular mounting hole. An arc groove (18) is provided on the inner side of the end arc ring (17), and an arc sealing strip (19) is fixedly connected inside the arc groove (18).

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