A filter membrane pore size measuring instrument

Abstract

This utility model discloses a filter membrane pore size measuring instrument, including a body. An operating box is fixed to the top of the body by screws, and a threaded nozzle is provided at the port of the top of the operating box. In this utility model, an operating box with a threaded cover is installed on the top of the body. A circularly cut filter membrane to be tested is placed on the lower support ring inside the operating box. The threaded cover is then rotated, causing it to thread into the threaded nozzle at the top port of the operating box. This causes the upper threaded ring inside the threaded cover to abut against the edge of the filter membrane to be tested on the lower support ring through a sealing ring, thus clamping the filter membrane between the upper threaded ring and the lower support ring. Combined with the cylinder on the side of the threaded cover and the flexible hose and pressure sensor on its top surface, compared with existing technologies, this instrument not only allows for quick loading and unloading of the filter membrane but also provides clamping and protection, avoiding the instability caused by the lack of clamping and protection functions in traditional filter membrane pore size analyzers.

Description

Technical Field

[0001] This utility model relates to the field of filter membrane pore size detection technology, and in particular to a filter membrane pore size measuring instrument. Background Technology

[0002] The bubble pressure method filter membrane pore size analyzer, also known as a filter material pore size analyzer, pore size tester, or bubble point pore size analyzer, works by using a gas-liquid displacement method to measure parameters such as bubble point pore size (maximum pore size), minimum pore size, average pore size (average flow pore size), pore size distribution, permeability, and gas flux of filter materials (including battery separators, filter cloths, filter cartridges, filter membranes, non-woven fabrics, etc.). Current technology uses bubble pressure to detect the size of pores on the filter membrane surface.

[0003] However, existing technologies lack the function of clamping and protecting the filter membrane to prevent it from falling to the outside. During the wetting agent penetration process, the filter membrane may float on the surface due to the inconsistency between its density and that of the wetting agent, resulting in unstable detection.

[0004] To address this issue, a filter membrane pore size measuring instrument is proposed, which has the advantage of easy filter membrane clamping and protection, thereby solving the problems mentioned in the background technology. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a filter membrane pore size measuring instrument.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a filter membrane pore size measuring instrument, comprising a body, an operating box fixed to the top of the body by screws, and a threaded nozzle provided at the port of the top of the operating box. A threaded box cover is installed on the external thread of the threaded nozzle, and a pressure sensor is embedded in the center of the top surface of the threaded box cover. A flexible tube is connected to the edge of the top surface of the threaded box cover. A mounting platform is fixed to the top surface of the body, and a gas supply system is embedded in the left side of the mounting platform surface, and a display panel is embedded in the right side of the mounting platform surface. The gas outlet of the gas supply system is connected to the flexible tube, and a gas flow meter is installed on the surface of the flexible tube. A lower support ring is fixed to the inner wall of the operating box, and an upper support ring is provided inside the threaded box cover. A sealing ring is adhered to the surface of the upper support ring. A filter membrane to be tested is placed between the upper support ring and the lower support ring, and the edge of the filter membrane to be tested abuts against the sealing ring of the upper support ring.

[0007] As a further description of the above technical solution: the bottom of the operation box is welded with a circular mounting base plate, and the surface of the mounting base plate is provided with a number of screw holes around it, and a drainage hole connected to the operation box is provided at the center of the mounting base plate.

[0008] As a further description of the above technical solution: the gas supply system includes a gas source, a pressure reducing valve, a hose, and a gas flow meter on its surface.

[0009] As a further description of the above technical solution: several cylinders are arranged around the side of the threaded box cover, and the inner side of the threaded box cover is provided with internal threads corresponding to the threaded nozzle.

[0010] As a further description of the above technical solution: the filter membrane to be tested has a circular structure, and the diameter of the filter membrane to be tested is larger than the inner diameter of the upper support ring and the lower support ring.

[0011] As a further description of the above technical solution: the inner ring of the lower support ring is provided with a number of spike-shaped protrusions, and the number of spike-shaped protrusions are in contact with the bottom surface of the filter membrane to be tested.

[0012] This utility model has the following beneficial effects:

[0013] In this invention, an operating box with a threaded cover is installed on the top of the machine body. The filter membrane to be tested, cut into a circle, is placed on the lower support ring inside the operating box. Then, the threaded cover is rotated so that it is threadedly connected to the threaded nozzle at the top port of the operating box. This causes the upper threaded ring inside the threaded cover to abut against the edge of the filter membrane to be tested on the lower support ring through a sealing ring, thus clamping the filter membrane between the upper threaded ring and the lower support ring. Combined with the cylinder on the side of the threaded cover and the flexible tube and pressure sensor on its top surface, compared with the prior art, this invention not only allows for quick loading and unloading of the filter membrane but also provides clamping and protection, avoiding the unstable detection caused by the lack of clamping and protection functions for filter membranes in traditional filter membrane pore size analyzers. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of a filter membrane pore size measuring instrument according to the present invention;

[0015] Figure 2 A schematic diagram of the internal structure of the control box and the threaded cover;

[0016] Figure 3 This is a top view of the control box;

[0017] Figure 4 This is a 3D view of the threaded box cover.

[0018] Legend:

[0019] 1. Body; 2. Mounting platform; 3. Control box; 4. Threaded cover; 5. Mounting base plate; 6. Gas supply system; 7. Display panel; 8. Pressure sensor; 9. Hoses; 10. Lower support ring; 11. Upper support ring; 12. Sealing ring; 13. Filter membrane to be tested; 14. Drain hole; 15. Threaded nozzle; 16. Cylinder. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] According to an embodiment of the present invention, a filter membrane pore size measuring instrument is provided.

[0022] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figure 1-4 As shown, a filter membrane pore size measuring instrument according to an embodiment of the present invention includes a body 1. An operation box 3 is fixed to the top of the body 1 by screws. A threaded nozzle 15 is provided at the port of the top of the operation box 3. A threaded box cover 4 is installed on the external thread of the threaded nozzle 15. A pressure sensor 8 is embedded in the center of the top surface of the threaded box cover 4. A flexible tube 9 is connected to the edge of the top surface of the threaded box cover 4. A mounting platform 2 is fixed to the top surface of the body 1. A gas supply system 6 is embedded in the left side of the surface of the mounting platform 2, and a display panel 7 is embedded in the right side of the surface of the mounting platform 2. The outlet of the gas supply system 6 is connected to the flexible tube 9. A gas flow meter is installed on the surface of the flexible tube 9. A lower support ring 10 is fixed to the inner wall of the operation box 3, and an upper support ring 11 is provided inside the threaded box cover 4. The upper support ring 11 has a sealing ring 12 bonded to its surface. The filter membrane 13 to be tested is disposed between the upper support ring 11 and the lower support ring 10, and the edge of the filter membrane 13 to be tested abuts against the sealing ring 12 of the upper support ring 11. The mounting platform 2 is used to provide a mounting structure for the gas supply system 6 and the display panel 7 of the machine body 1, and is an extension structure of the machine body 1. The machine body 1 is specifically a bubble pressure filter membrane through-hole pore size analyzer, model HL2020-BT or BSD-PB. The contents of the machine body 1 not described in detail in this specification are existing technologies known to those skilled in the art. The threaded operation box 3 and the threaded box cover 4 can achieve clamping protection of the filter membrane 13 to be tested while satisfying the sealing of the operation box 3, and can facilitate the quick removal of the filter membrane 13 to be tested later.

[0023] In one embodiment, a circular mounting base plate 5 is welded to the bottom of the operating box 3, and a number of screw holes are opened around the surface of the mounting base plate 5. A drain hole 14 connected to the operating box 3 is opened at the center of the mounting base plate 5. This structure makes it easy to install the operating box 3, and the drain hole 14 is convenient for later cleaning.

[0024] In one embodiment, the gas supply system 6 includes a gas source, a pressure reducing valve, a hose 9, and a gas flow meter on its surface. The gas source provides compressed air, the pressure reducing valve is used to regulate the gas pressure to keep it within the range required for the experiment, and the gas flow meter is used to measure the gas flow rate to ensure that the gas flow rate is stable within the set parameters and to ensure the normal operation of the bubble pressure filter membrane pore size analyzer.

[0025] In one embodiment, a plurality of cylinders 16 are arranged around the side of the threaded box cover 4, and the inner side of the threaded box cover 4 is provided with internal threads corresponding to the threaded nozzle 15. This structure facilitates the threaded installation of the threaded box cover 4 and makes it convenient to rotate the threaded box cover 4.

[0026] In one embodiment, the filter membrane 13 to be tested has a circular structure, and the diameter of the filter membrane 13 to be tested is larger than the inner diameter of the upper support ring 11 and the lower support ring 10. With this structure, it is easy to clamp the filter membrane 13 to be tested.

[0027] In one embodiment, the inner ring of the lower support ring 10 is provided with a plurality of spike-shaped protrusions, and the plurality of spike-shaped protrusions are in contact with the bottom surface of the filter membrane 13 to be tested. This structure makes it easy to increase the contact area between the lower support ring 10 and the filter membrane 13 to be tested, and prevent the filter membrane 13 to be tested from falling off.

[0028] Working principle:

[0029] In use, the filter membrane 13 to be tested is first thoroughly wetted with a wettable liquid. Due to surface tension, the wetting liquid is trapped within the pores of the filter membrane. The wetted filter membrane 13 is placed on the lower support ring 10 inside the operating box 3. Then, the threaded box cover 4 is rotated so that it is threadedly connected to the threaded nozzle 15 at the top port of the operating box 3. This causes the upper threaded ring inside the threaded box cover 4 to abut against the edge of the filter membrane 13 on the lower support ring 10 through the sealing ring 12, thus clamping the filter membrane 13 between the upper threaded ring and the lower support ring 10. When measuring the pore size, the gas supply system 6 of the machine body 1 is turned on, allowing compressed air to be injected into the sealed operating box 3 through the hose 9, applying a gradually increasing gas pressure to one side of the filter membrane 13. When the gas pressure reaches a level greater than the pressure generated by the surface tension of the wetting liquid in a certain pore size, the wetting liquid in that pore size will be expelled by the gas. During the test, the pressure and flow rate are recorded in real time to obtain a pressure-flow curve. Pressure reflects the pore size, and flow rate reflects the number of pores of a certain pore size. By comparing the relationship curves between pressure and gas flow rate under humid and dry conditions, the maximum pore size, average pore size, minimum pore size, pore size distribution, air permeability, and other parameters of the filter membrane are calculated according to a certain mathematical model and displayed on the display panel 7.

[0030] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A membrane filter pore size apparatus comprising a body (1) characterised in that: The top of the machine body (1) is fixed with an operation box (3) by screws, and a threaded nozzle (15) is provided at the port of the top of the operation box (3). A threaded box cover (4) is installed on the external thread of the threaded nozzle (15), and a pressure sensor (8) is embedded in the center of the top surface of the threaded box cover (4). A hose (9) is connected to the edge of the top surface of the threaded box cover (4). A mounting platform (2) is fixed on the top surface of the machine body (1), and a gas supply system (6) is embedded in the left side of the surface of the mounting platform (2), and a gas supply system (6) is embedded in the right side of the surface of the mounting platform (2). The display panel (7) is connected to the outlet of the gas supply system (6) and the hose (9). A gas flow meter is installed on the surface of the hose (9). A lower support ring (10) is fixed on the inner wall of the operation box (3). An upper support ring (11) is provided inside the threaded box cover (4), and a sealing ring (12) is bonded to the surface of the upper support ring (11). A filter membrane (13) to be tested is provided between the upper support ring (11) and the lower support ring (10), and the edge of the filter membrane (13) to be tested abuts against the sealing ring (12) of the upper support ring (11).

2. The membrane pore size measuring instrument according to claim 1, characterized in that: The bottom of the operation box (3) is welded with a circular mounting base plate (5), and the surface of the mounting base plate (5) is provided with several screw holes, and a drain hole (14) connected to the operation box (3) is provided at the center of the mounting base plate (5).

3. The membrane pore size measuring instrument according to claim 1, characterized in that: The gas supply system (6) includes a gas source, a pressure reducing valve, a hose (9) and a gas flow meter on its surface.

4. The membrane pore size measuring instrument according to claim 1, characterized in that: The threaded box cover (4) has several cylinders (16) arranged around its side, and the inner side of the threaded box cover (4) is provided with internal threads corresponding to the threaded nozzle (15).

5. The membrane pore size measuring instrument according to claim 1, characterized in that: The filter membrane to be tested (13) has a circular structure, and the diameter of the filter membrane to be tested (13) is larger than the inner diameter of the upper support ring (11) and the lower support ring (10).

6. The membrane pore size measuring instrument according to claim 1, characterized in that: The inner ring of the lower support ring (10) is provided with several spike-shaped protrusions, and all of the spike-shaped protrusions are in contact with the bottom surface of the filter membrane (13) to be tested.

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