A sealing device for hollow fiber membrane detection

Abstract

The present invention discloses a sealing device for hollow fiber membrane detection, comprising a shell, a sealing mechanism for fixing the hollow fiber membrane to be tested and arranged in the shell, and a connecting mechanism for fixing the sealing mechanism in the shell; the connecting mechanism comprises a base connected to the lower end of the shell, a needle tube arranged in the middle of the base and one end of which is connected to the outside, and the other end of the needle tube penetrates the sealing mechanism and is connected to the inner hole of the hollow fiber membrane to be tested. The present invention can be installed and sealed simply and quickly, and can be tested, saving the testing cost, greatly improving the speed, efficiency and accuracy of membrane performance testing, ensuring the timeliness of the testing, and facilitating the quality control of membrane products on the production line.

Description

Technical Field

[0001] The present invention relates to the field of polymer hollow fiber membrane performance detection, and in particular to a sealing device for polymer hollow fiber membrane detection. The sealing device can be used for rapid sealing and detection of hollow fiber membrane performance, and is particularly suitable for lining hollow fiber composite membranes. Background Art

[0002] With the rapid development of the national economy and the continuous improvement of people's living standards, the requirements for environmental safety, especially for water environment safety, are getting higher and higher. In order to obtain more stable and higher effluent quality, more and more membrane water treatment technologies are used in sewage treatment and drinking water treatment processes, among which hollow fiber ultra / microfiltration membranes are more and more widely used, and liner-reinforced hollow fiber composite membranes with higher mechanical strength and service life have been rapidly developed due to their superior performance. With the continuous increase in the output of hollow fiber membranes, the membrane quality is strictly controlled during the production process, and higher and higher requirements are also put forward for the rapid detection technology of hollow fiber membrane performance. The faster the membrane performance detection, the faster the quality control response of the production process, and the more stable the performance and quality of the membrane.

[0003] like Figure 1 As shown, the inner lining hollow fiber composite membrane 5 is mainly composed of a braided tube or other type of support material and a separation layer coated on the surface of the braided tube. The two structural layers are responsible for strength support and separation respectively. The separation layer is a filter membrane with a microporous structure, and water cannot pass through the membrane without pressure. The inner braided tube or support layer is woven from polymer fibers, with large gaps, and water can flow easily in it.

[0004] At present, the performance of the lined hollow fiber composite membrane (referred to as membrane wire in the industry) is quickly measured in this field, such as the determination of membrane flux, membrane bubble point, etc., generally using a needle to insert the inner circle of the membrane wire, and then using a thin rope to tie the membrane wire tightly to the needle head to achieve a sealing effect. Due to the large gap between the internal braided tube holes and the large thickness (about 0.5-2mm), the bundling method cannot be effectively sealed, especially after the test pressurization, the water will flow out of the braided tubes at both ends of the membrane wire, so that the membrane performance cannot be accurately obtained. In order to overcome this problem, the industry uses sealing glue to bond the membrane to the test pipe to obtain a good sealing effect. However, since the glue takes a certain amount of time to solidify, it affects the timeliness of the test and cannot meet the needs of rapid membrane performance testing on the production line. So far, the rapid detection of lined hollow fiber composite membranes (membrane wires) has always been difficult to balance timeliness and accuracy. Therefore, it has become increasingly important to use a simple and reliable sealing device to achieve rapid installation and sealing of membrane wires for the production of enhanced hollow fiber microfiltration membranes with stable and reliable quality. Summary of the invention

[0005] In order to solve the problem that it is difficult to achieve both timeliness and accuracy in the existing rapid detection of hollow fiber membranes (membrane filaments), the present invention proposes a sealing device for hollow fiber membrane detection which is simple and fast to install and has reliable sealing. The device can simply and quickly fix the membrane filaments and form a seal, while improving the detection speed and accuracy of membrane performance, providing a guarantee for the control of membrane filament quality in the production process, thereby improving product quality and market competitiveness.

[0006] The present invention provides a sealing device for hollow fiber membrane detection, comprising a shell, a sealing mechanism arranged in the shell for fixing the hollow fiber membrane to be tested, and a connecting mechanism for fixing the sealing mechanism in the shell; the connecting mechanism comprises a base connected to the lower end of the shell, a needle tube arranged in the middle of the base, one end of which is connected to the outside, and the other end of the needle tube penetrates into the sealing mechanism and is connected to the inner hole of the hollow fiber membrane to be tested.

[0007] Preferably, the shell is a tubular structure, the top of which is provided with a through hole for the hollow fiber membrane to be tested to be inserted into the sealing mechanism, and the inner circle of the lower end is provided with an internal thread connected to the base.

[0008] Preferably, the outer edge of the top of the shell is in a shape of a hexagon, a triangle, a pentagon or a circle.

[0009] Preferably, the sealing mechanism is a tubular body, the through hole at the top of which is for the hollow fiber membrane to be tested to be inserted, and the lower end is closed by a sealing ring, and the middle of the sealing ring is provided with a through hole for the needle tube to be inserted.

[0010] Preferably, the sealing mechanism is a tubular body, the through hole on the top of which is for the hollow fiber membrane to be tested to be inserted, and the lower end surface is a closed structure, and the middle of the lower end surface is provided with a through hole for the needle tube to be inserted.

[0011] Preferably, the outer circle of the base is provided with an outer thread connected to the inner thread of the shell. When the base and the shell are screwed together, the inner surface of the base abuts against the lower end of the sealing mechanism, and the needle tube is inserted into the inner circle of the hollow fiber membrane to be tested.

[0012] Preferably, the sealing mechanism is made of elastic material.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The present invention adopts a combination of mechanical and sealing ring sealing to form an airtight cavity between the membrane filament to be tested and the sealing mechanism, so that the liquid flowing out along the lower end of the membrane filament during detection is retained in the airtight cavity without leakage. The sealing performance of the liquid in the airtight cavity is guaranteed, thereby ensuring the accuracy of the detection. The present invention breaks through the limitations of the previous membrane filament detection that must be tied with thin ropes or glued, eliminates the process of preparing samples for membrane filament detection, and saves detection costs. It can be installed and sealed simply and quickly, greatly improving the speed and efficiency of membrane performance detection, which is beneficial to the quality control of membrane products on the production line. It is connected and fixed by screws, and the installation is simple and fast, ensuring the timeliness of the detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the lined hollow fiber composite membrane;

[0016] Figure 2 is a schematic diagram of the installation structure of an embodiment of a sealing device of the present invention;

[0017] Figure 3 Schematic diagram of water flow sealing of the sealing device of the present invention;

[0018] Figure 4 yes Figure 2 Schematic diagram of the connection structure;

[0019] Figure 5 yes Figure 2 Schematic diagram of the split sealing mechanism;

[0020] Figure 6 yes Figure 2 Schematic diagram of the middle shell. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the embodiments and drawings.

[0022] Figure 2 The figure shows an embodiment of a sealing device for hollow fiber membrane (membrane filament) detection provided by the present invention, which includes a housing 4, and a sealing mechanism disposed in the housing 4 for fixing the hollow fiber membrane 5 to be tested. In this embodiment, the membrane filament of the hollow fiber membrane 5 to be tested is a lined hollow fiber composite membrane, referred to as the membrane filament to be tested. There is also a connecting mechanism for fixing the sealing mechanism in the housing 4; the connecting mechanism includes a base 1 connected to one end of the housing 4, a needle tube 11 disposed at the lower end of the middle part of the base 1 and connected to the outside, and the upper end of the needle tube 11 penetrates the sealing mechanism and is connected to the inner hole of the membrane filament 5 to be tested.

[0023] In this embodiment, the housing 4 is a tubular structure. Figure 6The top of the housing 4 is provided with a through hole 41 for inserting the membrane filament 5 to be tested into the sealing mechanism, and the inner circle of the lower end is provided with an internal thread connected to the base 1 of the connecting mechanism. For the convenience of installation, the outer edge of the top of the housing 4 is generally hexagonal, and the outer edge of the top of the housing 4 can also be circular, triangular or pentagonal according to the needs of the installation site. Figure 5 , the sealing mechanism is a tubular body 3, the inner circular hole 31 at the top of which is for the insertion of the hollow fiber composite membrane 5 to be tested, and the lower end of which is closed by a sealing ring 2. In this embodiment, the sealing mechanism is a split structure, that is, the tubular body 3 and the sealing ring 2 are manufactured separately, and after installation, the sealing ring 2 closes the lower end of the tubular body 3 to form an integrated structure. A through hole is provided in the center of the sealing ring 2 for the insertion of the needle tube 11. The sealing ring 2 is used for sealing between the base 1 and the tubular body 3, and is a key component for forming an enclosed space. In another embodiment, the sealing mechanism can also be an integrated structure, that is, the tubular body 3 and the sealing ring 2 are integrally formed. The top of the tubular body 3 is provided with a through hole 31 for the insertion of the membrane filament 5 to be tested, and the lower end surface is provided with a through hole for the insertion of the needle tube 11. The sealing mechanism can be made of elastic material, such as plastic or rubber. Please combine Figure 4 The outer circle of the base 1 of the connecting mechanism is provided with an outer thread connected with the inner thread of the housing 4. When the base 1 is tightened with the housing 4, the inner surface of the base 1 is pressed against the lower end surface of the sealing mechanism, thereby fixing the sealing mechanism inside the housing 4, and at the same time, the bottom end of the tubular body 3 can be tightly combined with the sealing ring 2 to form a closed cavity. Moreover, the through hole 41 at the top of the housing 4 corresponds to the through hole 31 at the top of the tubular body 3 of the sealing mechanism, so that the lower end of the membrane filament 5 to be tested passes through the through hole 41 at the top of the housing 4 and the through hole 31 at the top of the tubular body 3 and is inserted into the sealing mechanism. The hollow needle tube 11 provided in the middle of the base is a channel for the detection fluid, and its upper end can be inserted into the inner circle of the lower end of the membrane filament 5 to be tested, and the lower end can be connected to the pressure fluid input from the outside. According to needs, the connecting mechanism can also be connected to the test pipeline of the membrane filament 5 to be tested by various suitable connection methods to introduce the pressure liquid or pressure gas required for the test.

[0024] Depend on Figure 2 As shown, the tubular body 3 and the sealing ring 2 of the sealing mechanism are used to wrap and seal the lower section of the membrane filament 5 to be tested, that is, the upper inner circular surface of the tubular body 3 is in close contact with the outer circular wall of the membrane filament 5 to be tested to form a mechanical seal, and the lower end of the tubular body 3 is in close contact with the sealing ring 2 to form a sealing surface, thereby forming a closed space 32 between the sealing mechanism and the membrane filament 5 to be tested to ensure the sealing effect of the insertion end of the membrane filament 5 to be tested. The sealing strength of the lower end of the tubular body 3 can be adjusted by the degree of tightening of the shell 4 and the base 1. If the sealing mechanism adopts an integrated structure, the sealing mechanism can be fixed in the shell 4 by tightening the shell 4 and the base 1.

[0025] When preparing for testing, Figure 2As shown, first, insert the sealing ring 2 onto the needle tube 11 of the base 1, and lay it flat at the lower end of the sealing mechanism; insert the lower end of the membrane thread 5 to be tested into the housing 4 and the sealing mechanism in turn, then insert the inner hole of the membrane thread 5 to be tested into the outer wall of the needle tube 11, and insert the housing 4 onto the base 1 and tighten it. In this way, the membrane thread 5 to be tested is installed and can be tested.

[0026] like Figure 3 As shown, the bottom needle tube 11 of the base 1 is connected to the water supply or air supply pipeline in advance by a suitable method, and can be connected by threaded connection, slipknot connection and then welding. According to the needs of the test, the upper end (outer end) of the membrane filament 5 to be tested can also be connected and sealed by the sealing device of the present invention, or it can be blocked by other methods. When the water pump is turned on to inject pressure liquid into the inner circle of the membrane filament 5 to be tested through the needle tube 11 of the base, the pressure liquid can flow downward along the axial direction of the wall material of the membrane filament 5 to be tested into the closed space 32 of the sealing mechanism. When the closed space is filled with liquid, the detection liquid will penetrate outward through the circumferential wall along the radial direction of the membrane filament 5 to be tested at a normal speed. At this time, the performance of the membrane filament 5 to be tested can be tested, such as parameters such as membrane flux.

[0027] The present invention can be simply and quickly installed and sealed, saving detection costs, greatly improving the speed, efficiency and accuracy of membrane performance detection, ensuring the timeliness of detection, and being beneficial to the quality control of membrane products on the production line.

[0028] The above descriptions are merely embodiments of the present invention and are 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 in the protection scope of the present invention.

Claims

1. A sealing device for hollow fiber membrane detection, characterized in that: It comprises a shell, a sealing mechanism arranged in the shell for fixing the hollow fiber membrane to be tested, and a connecting mechanism to fix the sealing mechanism in the shell; the connecting mechanism comprises a base connected to the lower end of the shell, a needle tube arranged in the middle of the base, one end of which is connected to the outside, and the other end of the needle tube penetrates the sealing mechanism and is connected to the inner hole of the hollow fiber membrane to be tested; wherein: The shell is a tubular structure, the top of which is provided with a through hole for the hollow fiber membrane to be tested to be inserted into the sealing mechanism, and the inner circle of the lower end is provided with an internal thread connected to the base.

2. The sealing device according to claim 1, characterized in that The outer edge of the top of the shell is in a shape of a hexagon, a triangle, a pentagon or a circle.

3. The sealing device according to claim 1, characterized in that: The sealing mechanism is a tubular body, the top of which is provided with a through hole for the hollow fiber membrane to be tested to be inserted, and the lower end is closed by a sealing ring, the middle of which is provided with a through hole for the needle tube to be inserted.

4. The sealing device according to claim 1, characterized in that The sealing mechanism is a tubular body, the top of which is provided with a through hole for the hollow fiber membrane to be tested to be inserted, and the lower end surface is a closed structure, and the middle of the lower end surface is provided with a through hole for the needle tube to be inserted.

5. The sealing device according to claim 1, characterized in that: The outer circle of the base is provided with an external thread connected to the internal thread of the shell. When the base and the shell are screwed together, the inner surface of the base is pressed against the lower end of the sealing mechanism, and the needle tube is inserted into the inner hole of the hollow fiber membrane to be tested.

6. The sealing device according to claim 1, characterized in that: The sealing mechanism is made of elastic material.

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