Structure for detecting bubble point pressure of hollow fiber membrane

Abstract

The utility model relates to the technical field of hollow fiber membrane bubble point pressure detection, in particular to a structure for detecting hollow fiber membrane bubble point pressure. Comprising an air pipe quick connector connected to an air source pipe, a containing cavity body is installed on the air pipe quick connector, hot melt adhesive is filled in the containing cavity body, and a plurality of fiber membrane silk detection samples penetrate through an inner cavity of the containing cavity body. The method is not limited by the dry state or the wet state of a membrane silk sample, a large number of samples can be manufactured and detected in a short time, measured data are accurate and efficient, the timeliness is extremely high, the tedious process of sample manufacturing and the falling problem during sample detection are avoided, the performance and quality of a membrane product can be fed back in time, and the working efficiency is greatly improved; a detection sample is simple to manufacture, expensive instruments are not needed, the detection cost is low, the period is short, the device is easy to assemble and disassemble, and large-batch sample detection in a basic laboratory can be met.

Description

Technical Field

[0001] This utility model relates to the field of hollow fiber membrane bubble point pressure detection technology, and in particular to a structure for detecting the bubble point pressure of hollow fiber membranes. Background Technology

[0002] Membrane pore size is a crucial indicator of separation membrane performance, directly impacting its filtration efficiency and application range. Precise measurement and control of membrane pore size are essential in industrial production and scientific research. According to GB / T32361-2015, "Membranes for Separation Membrane Pore Size Test Method," the bubble point pressure test system mainly consists of a gas source, membrane sample, and measuring cell. During the test, the membrane sample is placed in the measuring cell, and gas is injected into the cell through the gas source. The gas passes through the membrane sample under pressure, and the membrane pore size is calculated based on the gas pressure. In existing technologies, a fine needle connected to a gas source tube is typically used to pierce the membrane fiber through one end of the inner hole, and the other end of the membrane fiber is then sealed with a plugging needle. As the gas pressure entering the inner hole of the membrane fiber increases, technical indicators such as the membrane bubble point pressure or pore size are obtained.

[0003] However, this method is extremely inefficient in production testing, and with the improvement of production efficiency and product quality, it can no longer meet the requirements of the measurement system. Firstly, inserting the fine needle from one end of the membrane fiber leads to poor sealing at the connection between the needle and the hollow fiber membrane, causing gas leakage and measurement errors. Secondly, inserting the fine needle from one end of the membrane fiber makes it easy for the needle to detach from the hollow fiber membrane, severely affecting the timeliness of the test. Other testing methods involve manufacturing the membrane product as a component and using gas-liquid displacement or mercury porosimetry to test the bubble point pressure of the membrane. These methods can ensure data accuracy and precision, but require expensive equipment, high testing costs, long testing cycles, complex sample pretreatment procedures, and highly skilled operators, making them unsuitable for large-scale sample testing in basic laboratories. Utility Model Content

[0004] In view of this, the purpose of this utility model is to propose a structure for detecting the bubble point pressure of hollow fiber membranes, so as to solve the technical problems of poor sealing at the joints and unsuitability for large-scale sample testing in grassroots laboratories.

[0005] Based on the above objectives, this utility model provides a structure for detecting the bubble point pressure of hollow fiber membranes, including a quick-connect fitting for a gas supply pipe, a receiving cavity body installed on the quick-connect fitting, the receiving cavity body being filled with hot melt adhesive, and a plurality of fiber membrane filaments for detecting the sample passing through the inner cavity of the receiving cavity body. The structure for detecting the bubble point pressure of hollow fiber membranes further includes:

[0006] A threaded sleeve is fixedly disposed on the upper part of the receiving cavity body, and the threaded sleeve is threadedly installed on the quick-connect fitting of the air pipe.

[0007] A closed bottom plate is provided at the bottom of the receiving cavity body, and the fiber membrane filament detection sample passes through the closed bottom plate;

[0008] A top closure for expelling air bubbles from the hot melt adhesive within the receiving cavity.

[0009] Furthermore, the lower part of the receiving cavity body is conical.

[0010] Furthermore, the fiber membrane filament detection sample is U-shaped within the receiving cavity, with its root ends sequentially penetrating the sealed bottom plate, the receiving cavity body, and the top sealing member.

[0011] Furthermore, the upper end of the top closure is provided with an extension section, which abuts against the upper port edge of the receiving cavity body. The upper part of the top closure is also provided with an arc-shaped convex surface and an arc-shaped concave surface with openings. The fiber membrane filament detection sample passes through the perforations on the arc-shaped convex surface and the arc-shaped concave surface. An exhaust port is provided in the middle of the arc-shaped convex surface.

[0012] Furthermore, the lower end of the top closure is provided with a protruding section that passes through the closure base plate.

[0013] Furthermore, a first pressure gauge is provided on the gas source pipe.

[0014] Furthermore, a second pressure gauge is provided on the gas source pipe, and a pressure regulating valve is provided on the gas source pipe between the first pressure gauge and the second pressure gauge.

[0015] Furthermore, neither end of the root of the fiber membrane filament test sample extends beyond the top closure.

[0016] The beneficial effects of this utility model are:

[0017] 1. The test sample of this utility model can test multiple hollow fiber membranes simultaneously, regardless of whether the membrane fiber sample is dry or wet. It can complete the preparation and testing of a large number of samples in a short time. The measurement data is accurate, efficient and timely, avoiding the cumbersome process of sample preparation and the problem of sample falling off during testing. It can provide immediate feedback on the performance and quality of membrane products, greatly improving work efficiency.

[0018] 2. The test samples prepared by this utility model are simple to prepare, do not require expensive instruments, have low testing costs, short cycles, and are easy to assemble and disassemble, which can meet the needs of large-scale sample testing in grassroots laboratories. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the present invention in the state of hot melt adhesive filling;

[0021] Figure 2 This is a schematic diagram showing the state of the sample tail section when the fiber membrane filament of this utility model is cut;

[0022] Figure 3 This is a schematic diagram showing the state of the sample during the testing process of the fiber membrane filament according to this utility model;

[0023] Figure 4 This is a schematic diagram of the top closure component in this utility model;

[0024] Figure 5 This is a schematic diagram of the internal structure of the top closure component in this utility model;

[0025] Figure 6 This is a schematic diagram of the closed base plate in this utility model.

[0026] The diagram is marked as follows:

[0027] 1. Gas source pipe; 2. Quick-connect gas pipe connector; 3. Receiving cavity body; 4. Fiber membrane filament test sample; 5. Threaded sleeve; 6. Sealed base plate; 7. Top sealing component; 8. Exhaust port; 9. Extension section; 10. First pressure gauge; 11. Second pressure gauge; 12. Pressure regulating valve. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0029] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0030] An embodiment of this utility model proposes a structure for detecting the bubble point pressure of hollow fiber membranes, such as... Figure 1-6 As shown, the structure includes a quick-connect fitting 2 for the air supply pipe 1, a receiving cavity body 3 installed on the quick-connect fitting 2, hot melt adhesive filling the receiving cavity body 3, and several fiber membrane filaments for detecting samples 4 passing through the inner cavity of the receiving cavity body 3. The structure for detecting the bubble point pressure of the hollow fiber membrane also includes:

[0031] Threaded sleeve 5 is fixedly installed on the upper part of the receiving cavity body 3, and threaded sleeve 5 is threadedly installed on the quick-connect fitting 2 of the air pipe.

[0032] A closed bottom plate 6 is located at the bottom of the receiving cavity body 3, and the fiber membrane filament detection sample 4 passes through the closed bottom plate 6.

[0033] Top sealing element 7 for extruding air bubbles in the hot melt adhesive inside the cavity body 3.

[0034] In this embodiment, the lower part of the cavity body 3 is conical.

[0035] In this embodiment, the fiber membrane filament detection sample 4 is U-shaped inside the receiving cavity body 3, and the two ends of the root of the fiber membrane filament detection sample 4 pass through the sealing bottom plate 6, the receiving cavity body 3 and the top sealing member 7 in sequence.

[0036] In this embodiment, the upper end of the top sealing member 7 is provided with an extension section, which abuts against the upper port edge of the receiving cavity body 3. The upper part of the top sealing member 7 is also provided with an arc-shaped convex surface and an arc-shaped concave surface with openings. The fiber membrane filament detection sample 4 passes through the perforations on the arc-shaped convex surface and the arc-shaped concave surface. An exhaust port 8 is provided in the middle of the arc-shaped convex surface.

[0037] In this embodiment, the lower end of the top closure 7 is provided with a protruding section 9, which passes through the closure bottom plate 6.

[0038] In this embodiment, a first pressure gauge 10 is provided on the gas source pipe 1.

[0039] In this embodiment, a second pressure gauge 11 is provided on the gas source pipe 1, and a pressure regulating valve 12 is provided on the gas source pipe 1 between the first pressure gauge 10 and the second pressure gauge 11.

[0040] In this embodiment, the root ends of the fiber membrane filament detection sample 4 do not extend beyond the top sealing member 7.

[0041] Working process and principle: In this embodiment, several fiber membrane sample 4 to be tested are first folded into a "U" shape. The two ends of the root pass through the closed base plate 6, the receiving cavity body 3 filled with hot melt adhesive and the top sealing member 7 from bottom to top. Then, the extension section 9 passing through the closed base plate 6 is pulled down until the extension section on the top sealing member 7 rests against the upper port edge of the receiving cavity body 3, so as to squeeze out the air bubbles in the hot melt adhesive filled in the receiving cavity body 3 from the exhaust port 8. After the hot melt adhesive has completely solidified, the excess tail section of the fiber membrane sample 4 on this structure is cut off with a cutting tool, so that the inner hole of the fiber membrane sample 4 is completely exposed.

[0042] Then, the receiving cavity body 3 is connected to the quick-connect fitting 2 of the air tube through the threaded sleeve 5, and the membrane fiber portion of the fiber membrane fiber test sample 4 is placed in the test water tank to completely immerse the membrane fiber. The first pressure gauge 10 is adjusted to stabilize at 0.3 MPa, and then the pressure regulating valve 12 is opened to slowly increase the pressure by 1 MPa each time. The surface of the fiber membrane fiber test sample 4 is observed. As the air pressure entering the membrane fiber pore increases, the pressure of the first bubble generated from the surface of the membrane fiber is recorded. The data of the second pressure gauge 11 is the bubble point pressure of the first membrane fiber. Then, the membrane fiber that has produced continuous bubbles is separated from the other membrane fibers, removed from the test water tank, and the pressure is increased. When continuous bubbles seep out again from the surface of the second membrane fiber, the data of the second pressure gauge 11 is recorded as the bubble point pressure of the second membrane fiber. The bubble point pressure test of all membrane fibers is completed.

[0043] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0044] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A structure for detecting a bubble point pressure of a hollow fiber membrane comprising a gas tube quick coupling (2) connected to a gas source tube (1), characterized in that, The trachea quick connector (2) is provided with a containing cavity body (3), the containing cavity body (3) is filled with hot melt adhesive, a plurality of fiber membrane wire detection samples (4) are arranged in the inner cavity of the containing cavity body (3), and the structure for detecting the hollow fiber membrane bubble point pressure further comprises: A threaded sleeve (5) is fixedly arranged on the upper portion of the containing cavity body (3), and the threaded sleeve (5) is threadedly connected to the trachea quick connector (2); A closed bottom plate (6) is arranged on the bottom of the containing cavity body (3), and the fiber membrane wire detection sample (4) penetrates through the closed bottom plate (6); A top closing piece (7) for extruding bubbles in the hot melt adhesive in the containing cavity body (3) is arranged.

2. A structure for detecting a bubble point pressure of a hollow fiber membrane according to claim 1, wherein The lower portion of the containing cavity body (3) is in a conical cylinder shape.

3. A structure for detecting a bubble point pressure of a hollow fiber membrane according to claim 1, wherein The fiber membrane wire detection sample (4) is in a whole "U" shape in the containing cavity body (3), and the two ends of the root of the fiber membrane wire detection sample (4) penetrate through the closed bottom plate (6), the containing cavity body (3) and the top closing piece (7) in sequence.

4. The structure for detecting a bubble point pressure of a hollow fiber membrane according to claim 1, wherein The upper end of the top closing piece (7) is provided with an extension section, the extension section is arranged on the upper end port edge of the containing cavity body (3), the upper portion of the top closing piece (7) is further provided with an arc convex surface and an arc concave surface, the fiber membrane wire detection sample (4) penetrates through the perforations on the arc convex surface and the arc concave surface, and the arc convex surface is provided with an exhaust port (8) in the middle portion.

5. A structure for detecting a bubble point pressure of a hollow fiber membrane according to claim 4, wherein The lower end of the top closing piece (7) is provided with an extension section (9), and the extension section (9) penetrates through the closed bottom plate (6).

6. The structure for detecting a bubble point pressure of a hollow fiber membrane according to claim 1, wherein The gas source pipe (1) is provided with a first pressure gauge (10).

7. A structure for detecting a bubble point pressure of a hollow fiber membrane according to claim 6, wherein The gas source pipe (1) is provided with a second pressure gauge (11), and the gas source pipe (1) is provided with a pressure regulating valve (12) between the first pressure gauge (10) and the second pressure gauge (11).

8. The structure for detecting a bubble point pressure of a hollow fiber membrane according to claim 3, wherein The two ends of the root of the fiber membrane wire detection sample (4) do not exceed the top closing piece (7).

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