Manufacturing method of detachable flexible tubular membrane for experiment

Abstract

The invention discloses a manufacturing method of a detachable experimental flexible tubular membrane, which enables a shell to be assembled conveniently, assembling materials and tools to be simple and reliable, enables the assembling cost to be low, and can be quickly and reliably replaced when the tubular membrane is polluted and blocked or needs to be replaced. The method is characterized in that a shell with openings in two ends and a water inlet and outlet in the axial length direction is quickly assembled in advance according to the length and the outer diameter of a tubular membrane element to be detected, two groups of movable joint assemblies with proper pore diameters are selected, and each movable joint assembly comprises a movable joint upper half part and a movable joint lower half part, openings at the two ends of the shell are fixedly connected with the corresponding loose joint lower half parts respectively, then the external threads of the loose joint upper half parts are connected with the internal threads at the corresponding ends of the loose joint lower half parts, so that the loose joint upper half parts are arranged in an upward and outward protruding mode, and then a tubular membrane element to be detected is inserted into an inner cavity of the shell. And two axial ends of the to-be-detected tubular membrane element are fixed and sealed in the cavity area of the upper half part of the loose joint at the corresponding position through pouring sealant.

Description

Technical Field

[0001] The invention relates to the technical field of tubular membrane element testing, in particular to a method for manufacturing a detachable flexible tubular membrane for experiments. Background Art

[0002] Tubular membrane elements are a common form of filtration membrane application technology. Depending on the processing capacity of the equipment, the length of tubular membrane elements can generally be 1-3 meters, and the number of membrane tubes contained in the element ranges from dozens to hundreds. Laboratory test of tubular membrane elements is an important step in the process of material and process verification. General test elements are reduced simulations of the size or number of full-size elements in industrial applications. The common form is to manufacture a test element containing a single tubular membrane, and test the operation of a single membrane or the treatment effect of filtration separation under hydraulic conditions close to those of a full-size element. A full-size membrane element is equivalent to multiple single membrane elements running in parallel. It is an ideal test mode for comprehensively evaluating the impact of membrane materials and hydraulic conditions.

[0003] The existing technology has the following problems when manufacturing a single test element: (1) There is no ready-made membrane element shell, and it is necessary to find accessories of suitable size for assembly or mold opening and customization; (2) It is necessary to develop the required tooling and fixtures for assembly by yourself; (3) If a detachable sealing method is used between the membrane tube and the shell, such as O-ring sealing, the packaging is complicated (multiple O-rings need to be installed), the pressure resistance is low, and it is difficult to find a shell of suitable size; (4) If a potting sealant is used between the membrane tube and the shell, it cannot be disassembled after potting, and the membrane cannot be replaced. After the membrane material is blocked, the entire test membrane tube will be completely scrapped.

[0004] Therefore, it is urgent to develop a manufacturing method of a detachable experimental flexible tubular membrane to reduce the test cost and make the test convenient and reliable. Summary of the invention

[0005] In response to the above problems, the present invention provides a method for manufacturing a detachable flexible tubular membrane for experiments, which facilitates the assembly of the shell, and the assembly materials and tools are simple and reliable, so that the assembly cost is low, and when the tubular membrane is fouled or needs to be replaced, it can be replaced quickly and reliably.

[0006] A method for manufacturing a detachable flexible tubular membrane for experiments, characterized in that: it is pre-assembled according to the length and outer diameter of the tubular membrane element to be tested to form a shell with two openings at both ends and an inlet and outlet arranged in the axial length direction, and two groups of flexible joint assemblies with suitable apertures are selected, each group of flexible joint assemblies includes a flexible upper half and a flexible lower half, and the openings at both ends of the shell are respectively fixed to the corresponding flexible lower half, and then the external thread of the flexible upper half is connected to the corresponding end internal thread of the flexible lower half, so that the flexible upper half is axially convex, and then the tubular membrane element to be tested is inserted into the inner cavity of the shell, and the axial ends of the tubular membrane element to be tested are fixed and sealed to the cavity area of ​​the flexible upper half at the corresponding position by potting glue.

[0007] It includes the following steps:

[0008] S1, measuring the size of the tubular membrane element to be tested;

[0009] S2, selecting a housing component according to the parameters obtained in step S1, the housing component is at least two center tubes with the same aperture, a three-way joint, an optional straight joint, and two sets of union components, the union components include a union upper half and a union lower half, wherein the connection interfaces of the union upper half and the union lower half, and the connection methods of the exposed external connection interfaces are all external thread interfaces;

[0010] S3, assembling the housing through the housing assembly obtained in step S2, wherein the axial ends of the housing are respectively provided with corresponding upper half parts of the movable joint, and the external connection interfaces of the upper half parts of the movable joint are arranged at the corresponding end sides;

[0011] S4. After the shell is assembled, the tubular membrane element to be tested is placed inside the shell, and the axial ends of the tubular membrane element to be tested are respectively convex, and a sealing connection is formed by a potting glue and the inner wall of the upper half of the live joint, wherein the potting glue is a common potting material such as epoxy glue or polyurethane glue, and the inner edge depth of the potting glue is not greater than the depth of the upper half of the live joint;

[0012] S5. After both ends are potted and cured, the glue is cut on the outer periphery of both ends of the tubular membrane element to be tested, and the production of the flexible tubular membrane for testing is completed.

[0013] It is further characterized by:

[0014] In step S4, the extension of the tubular membrane element to be tested out of the housing is preferably 10-15 mm, and the ports at both ends of the length direction of the tubular membrane element to be tested are pre-sealed;

[0015] The sealing operation uses plastic plugs or silicone seals;

[0016] In step S4, a glue pouring fixture is used to perform a glue pouring operation. The glue pouring fixture includes an internally threaded pipe cap, a glue inlet pipe, and a quick-plug connector. The internally threaded pipe cap is threadedly connected to an external interface of the upper half of the union. After the internally threaded pipe cap is screwed onto the upper half of the union, the corresponding end of the tubular membrane element to be tested is located in the inner cavity of the end plate of the internally threaded pipe cap. A glue inlet hole is provided on the end plate of the internally threaded pipe cap. A quick-plug connector is fixed to the glue inlet hole. The quick-plug connector is connected to one end of the glue inlet pipe, and the other end of the glue inlet pipe is externally connected to a glue inlet container.

[0017] When the potting glue is operated, the specific steps are as follows:

[0018] a. Before pouring the glue, use sandpaper to roughen the inner ring surface of the two upper joints of the shell to increase the adhesion of the potting glue.

[0019] b. Place the housing vertically and place the tubular membrane element to be tested in the housing and center it;

[0020] c. Apply a layer of vaseline evenly to the external connection interfaces of the upper half of the joints at both ends of the shell, and all inner surfaces of the internal threaded pipe cap including the internal thread;

[0021] d. Connect the internal threaded pipe cap to the lower end of the shell through the threaded interface. Pay attention to the height of the internal threaded pipe cap when screwing it, so that the height of the tubular membrane element to be tested protrudes from the shell from the inner bottom surface of the end plate of the internal threaded pipe cap to the lower edge of the shell. Then, glue is poured into the inner cavity formed by the internal threaded pipe cap, the upper half of the lower joint, and the tubular membrane element to be tested through the glue inlet pipe. The glue pouring height shall not exceed the length of the upper half of the joint.

[0022] e. Complete the potting glue operation on one end. After the potting glue is solidified, turn the housing together with the tubular membrane element to be tested around and repeat step d to perform the potting glue operation on the other end;

[0023] Before cutting the glue in step S5, the glue potting fixture is removed. Since petroleum jelly is applied inside the internal threaded pipe cap, the potting glue does not adhere to the inner surface of the internal threaded pipe cap and can be removed from the threaded connection. After removal, the glue is cut. The glue cutting parts are the two ends of the tubular membrane element to be tested and the outer periphery of the upper half of the joints at both ends. After the glue cutting is completed, the test membrane element is completed.

[0024] Or if the internal thread pipe cap cannot be removed due to various reasons, the internal thread pipe cap can be cut off together with the glue for disposable use.

[0025] It is further characterized by:

[0026] When the tubular membrane element to be tested is tested, the seal of at least one end of the tubular membrane element to be tested is opened, and a membrane filtration communication channel is formed through the water inlet and outlet. After the tubular membrane element to be tested is tested, if the internal tubular membrane element to be tested is blocked, damaged, or cannot be used for other reasons and needs to be replaced, the upper half of the joint is separated from the lower half of the joint by external force, and the tubular membrane element to be tested is cut off. After that, only a new tubular membrane and two sets of upper halves of the joint need to be replaced, and steps S3-S5 can be repeated to re-make a new flexible tubular membrane for the experiment.

[0027] It is further characterized by:

[0028] The central tube is made of commonly used plastic pipes or metal pipes; the inner diameter of the central tube is 4-10 mm larger than the outer diameter of the tubular membrane; the lengths of all central tubes can be the same or different according to requirements;

[0029] The material of the plastic pipe fittings is PVC, CPVC, UPVC, PPR or ABS, and the material of the metal pipe fittings is copper, carbon steel or stainless steel;

[0030] The material of the three-way joint and the optional straight joint is the same as that of the central tube. When the number of central tubes is greater than three, a corresponding straight joint needs to be provided to connect the central tubes;

[0031] Preferably, the number of the central tubes is two, and only one three-way joint is needed to connect the two sets of central tubes and form a water inlet and outlet;

[0032] The joint connection method between the lower half of the live joint and the corresponding end of the shell is a straight-in interface or a threaded interface. The straight-in interface is connected by gluing, electric welding, hot-melt welding, or a pressure joint according to the selected material. When gluing, suitable glue is selected according to the selected material. The threaded interface is suitable for various materials and is threadedly connected by internal or external threads.

[0033] After adopting the present invention, it has the following advantages:

[0034] (1) Common standard pipe fittings are used as assembly accessories, and the material cost is low and easy to obtain;

[0035] (2) The tooling and fixtures used for assembly are simple;

[0036] (3) The housing is easy to assemble;

[0037] (4) When the tubular membrane is blocked or needs to be replaced, only the tubular membrane and the seals at both ends need to be scrapped, and the remaining materials can be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 An exploded view of the structure schematic diagram of a housing assembly corresponding to a specific embodiment of the present invention;

[0039] Figure 2 It is a schematic diagram of the structure of the flexible tubular membrane for experiments after assembly of the present invention;

[0040] Figure 3 is a schematic diagram of a glue filling device applicable to the present invention;

[0041] Figure 4 A schematic diagram of a glue pouring operation using the glue pouring fixture of the present invention;

[0042] The names corresponding to the serial numbers in the figure are as follows:

[0043] The tubular membrane element to be tested 10, the flexible joint assembly 20, the flexible joint upper part 21, the connection interface 211, the external connection interface 212, the flexible joint lower part 22, the central tube 30, the three-way joint 40, the glue filling fixture 50, the internal threaded pipe cap 51, the glue inlet pipe 52, and the quick-connect joint 53. DETAILED DESCRIPTION

[0044] A method for manufacturing a detachable experimental flexible tubular membrane, see Figure 1-Figure 4 : It is pre-assembled according to the length and outer diameter of the tubular membrane element 10 to be tested to form a shell with two openings at both ends and a water inlet and outlet in the axial length direction, and two groups of flexible joint assemblies 20 with appropriate apertures are selected. Each group of flexible joint assemblies 20 includes a flexible upper half 21 and a flexible lower half 22. The openings at both ends of the shell are respectively fixed to the corresponding flexible lower half 22, and then the external thread of the flexible upper half 22 is connected to the corresponding end internal thread of the flexible lower half 21, so that the flexible upper half 21 is axially convex, and then the tubular membrane element 10 to be tested is inserted into the inner cavity of the shell, and the axial ends of the tubular membrane element 10 to be tested are fixed and sealed to the cavity area of ​​the flexible upper half 21 at the corresponding position by potting glue.

[0045] It includes the following steps:

[0046] S1, measuring the size of the tubular membrane element 10 to be tested;

[0047] S2, selecting a housing component according to the parameters obtained in step S1, the housing component is at least two central tubes 30 with the same aperture, a three-way connector 40, an optional straight connector, and two sets of flexible joint components 20, the flexible joint components 20 include a flexible joint upper half 21 and a flexible joint lower half 22, wherein the connection interface 211 of the flexible joint upper half 21 and the flexible joint lower half 22, and the exposed external connection interface 212 are all connected by external threaded interfaces;

[0048] S3, assembling the housing through the housing assembly obtained in step S2, wherein the axial ends of the housing are respectively provided with corresponding upper joint halves 21, and the external connection interfaces 212 of the upper joint halves 21 are arranged at the corresponding end sides;

[0049] S4. After the shell is assembled, the tubular membrane element 10 to be tested is placed inside the shell, and the two axial ends of the tubular membrane element 10 to be tested are respectively convex, and a sealing connection is formed by the potting glue and the inner wall of the upper half 21 of the movable joint, wherein the potting glue is a common potting material such as epoxy glue or polyurethane glue, and the inner edge depth of the potting glue is not greater than the depth of the upper half 21 of the movable joint;

[0050] The protruding dimensions of the two ends of the tubular membrane element 10 to be tested extending out of the housing are preferably 10-15 mm, and the two ends of the tubular membrane element 10 to be tested in the longitudinal direction are pre-sealed; the sealing operation adopts a plastic plug or a silicone seal;

[0051] In step S4, a glue pouring device is used to perform a glue pouring operation. The glue pouring device 50 includes an internally threaded pipe cap 51, a glue inlet pipe 52, and a quick-insert connector 53. The internally threaded pipe cap 51 is threadedly connected to the external interface 212 of the upper half of the flexible joint 21. After the internally threaded pipe cap 51 is screwed onto the upper half of the flexible joint 21, the corresponding end of the tubular membrane element 10 to be tested is located in the inner cavity of the end plate of the internally threaded pipe cap 51. A glue inlet hole is provided on the end plate of the internally threaded pipe cap 51. The glue inlet hole is fixed with a quick-insert connector 53. The quick-insert connector 53 is connected to one end of the glue inlet pipe 52. The other end of the glue inlet pipe 52 is externally connected to a glue inlet container.

[0052] When the potting glue is operated, the specific steps are as follows:

[0053] a. Before potting, use sandpaper to roughen the inner ring surfaces of the two upper joints 21 of the housing to increase the bonding force of the potting glue.

[0054] b. Place the housing vertically, and place the tubular membrane element 10 to be tested into the housing and center it;

[0055] c. Apply a layer of vaseline evenly to the external connection interface 212 of the upper joint 21 at both ends of the housing and all inner surfaces of the internal threaded pipe cap 51 including the internal thread;

[0056] d. Connect the internal threaded pipe cap 51 to the lower end of the housing through a threaded interface. Pay attention to the height of the internal threaded pipe cap 51 so that the height of the tubular membrane element 10 to be tested protrudes from the housing from the inner bottom surface of the end plate of the internal threaded pipe cap 51 to the lower edge of the housing is reserved. Then, glue is poured into the inner cavity formed by the internal threaded pipe cap 51, the upper half of the lower end of the flexible joint 21, and the tubular membrane element 10 to be tested through the glue inlet pipe 52. The glue pouring height does not exceed the length of the upper half of the flexible joint 21.

[0057] f. Complete the potting glue operation at one end. After the potting glue is solidified, turn the housing together with the tubular membrane element 10 to be tested around, and repeat step d to perform the potting glue operation at the other end;

[0058] S5. After both ends are potted and cured, the outer periphery of both ends of the tubular membrane element 10 to be tested is cut, and the flexible tubular membrane for testing is manufactured;

[0059] Before cutting the glue in step S5, the glue potting fixture 50 is removed. Since Vaseline is applied inside the internal threaded pipe cap 51, the potting glue does not adhere to the inner surface of the internal threaded pipe cap 51 and can be removed from the threaded connection. After removal, the glue is cut. The glue cutting parts are the two ends of the tubular membrane element 10 to be tested and the outer periphery of the upper joints 21 of the two ends. After the glue cutting is completed, the test membrane element is completed.

[0060] If the internal thread pipe cap cannot be removed due to various reasons, the internal thread pipe cap 51 can be cut off together with the glue for disposable use.

[0061] When the tubular membrane element 10 to be tested is tested, the seal of at least one end of the tubular membrane element 10 to be tested is opened, and a membrane filtration communication channel is formed through the water inlet and outlet. After the tubular membrane element 10 to be tested is tested, if the internal tubular membrane element 10 to be tested is blocked, damaged, or cannot be used for other reasons and needs to be replaced, the upper half 21 of the flexible joint is separated from the lower half 22 of the flexible joint by external force, and the tubular membrane element 10 to be tested is cut off. After that, only a new tubular membrane and two sets of upper half 21 of the flexible joint need to be replaced, and steps S3-S5 can be repeated to re-make a new flexible tubular membrane for the experiment.

[0062] In specific implementation, the central tube 30 is made of commonly used plastic pipes or metal pipes; the inner diameter of the central tube 30 is 4-10 mm larger than the outer diameter of the tubular membrane; the lengths of all central tubes 30 can be the same or different according to requirements;

[0063] The material of plastic pipe fittings is PVC, CPVC, UPVC, PPR or ABS, and the material of metal pipe fittings is copper, carbon steel or stainless steel;

[0064] The material of the tee joint 40 and the optional straight joint is the same as that of the central tube 30. When the number of central tubes 30 is greater than three, a corresponding straight joint needs to be provided to connect the central tubes;

[0065] In a specific embodiment, the number of the central tubes 30 is two, and only one three-way connector 40 is needed to connect the two sets of central tubes and form a water inlet and outlet;

[0066] The joint connection method between the lower half 22 of the joint and the corresponding end of the shell is a straight-in interface or a threaded interface. The straight-in interface is connected by gluing, electric welding, hot-melt welding, or pressure joint according to the selected material. When gluing, choose the appropriate glue according to the selected material; the threaded interface is suitable for various materials and is threadedly connected by internal or external threads. Specific embodiment 1

[0068] S1. The tubular membrane element 10 to be tested is a flexible tubular membrane with an outer diameter of 15 mm and a length of 1030 mm. Both ends of the tubular membrane are sealed with ABS plastic caps;

[0069] S2, select two center tubes 30, size DN25, material PVC, length 420mm each, select one tee joint 40, size DN25, material PVC, select two sets of union components, size DN25, material PVC, one end is an external thread interface, the thread size is 1 inch;

[0070] S3, the facing ends of the two central tubes 30 are respectively connected to the three-way joint 40 by direct plug-in connection, and the other ends of the two central tubes 30 are respectively connected to the lower half of the joint 22 by direct plug-in connection, and the lower half of the joint is bonded by PVC glue. The axial ends of the shell are respectively provided with corresponding upper half of the joint 21 connected by threads, and the external connection interface 212 of the upper half of the joint 21 is arranged on the corresponding end side;

[0071] S4. After the shell is assembled, the tubular membrane element 10 to be tested is placed inside the shell, and the two axial ends of the tubular membrane element 10 to be tested are respectively convex, and a sealing connection is formed by a potting glue and the inner wall of the upper half of the joint, wherein the potting glue is a common potting material such as epoxy glue or polyurethane glue, and the inner edge depth of the potting glue is not greater than the depth of the upper half of the joint 21;

[0072] The tubular membrane element 10 to be tested extends out of the housing by 15 mm, and the ports at both ends of the length direction of the tubular membrane element 10 to be tested are sealed in advance;

[0073] In step S4, a glue potting device is used to perform a glue potting operation. The glue potting device includes an internal threaded pipe cap 51, a glue inlet pipe 52, and a quick-connect connector 53. The internal threaded pipe cap 51 is DN25 in size, made of PVC, and has an internal thread size of 1 inch. The internal threaded pipe cap 51 is threadedly connected to the external interface 212 of the upper half of the union 21. After the internal threaded pipe cap 51 is screwed onto the upper half of the union 21, the corresponding end of the tubular membrane element 10 to be tested is located in the inner cavity of the end plate of the internal threaded pipe cap 51. An M5 threaded hole is provided on the end plate of the internal threaded pipe cap 51 as a The glue inlet hole is fixed with a quick-insert connector 53. The quick-insert connector 53 is a threaded straight-through quick-insert connector made of brass with a thread size of M5. The quick-insert size is adapted to an 8mm air pipe. The glue inlet pipe 52 uses a PU air pipe with an outer diameter of 8mm and a length of 20cm. The quick-insert connector 53 is connected to one end of the glue inlet pipe 52, and the other end of the glue inlet pipe 52 is externally connected to a glue inlet container. The quick-insert connector 53 is connected to the bottom glue inlet hole of the internal threaded pipe cap 51, and the glue inlet pipe 52 is inserted into the quick-insert connector 52 to form a glue filling fixture. A total of two sets of glue filling fixtures are made.

[0074] When the potting glue is operated, the specific steps are as follows:

[0075] a. Before potting, use 100-grit sandpaper to roughen the inner ring surface of the two upper joints 21 of the housing to increase the bonding strength of the potting glue;

[0076] d. Place the housing vertically, and place the tubular membrane element 10 to be tested into the housing and center it;

[0077] c. Apply a layer of vaseline evenly to the external connection interface 212 of the upper joint 21 at both ends of the housing and all inner surfaces of the internal threaded pipe cap 51 including the internal thread;

[0078] d. Connect the internal threaded pipe cap 51 to the lower end of the housing through a threaded interface. The height of the threaded screw is 6-7 mm (the height mark can be made in advance), so that the inner bottom surface of the end plate of the internal threaded pipe cap 51 does not touch the bottom of the tubular membrane. Then, glue is poured into the inner cavity formed by the internal threaded pipe cap 51, the upper half of the lower end of the flexible joint 21, and the tubular membrane element 10 to be tested through the glue inlet pipe 52. The glue pouring height does not exceed the length of the upper half of the flexible joint 21. The epoxy potting glue containing glue and curing agent components is used for glue pouring. The glue is poured from the glue inlet pipe 52 using a rubber-tipped dropper. The amount of glue poured into each end is 22 grams. After pouring, it is left to stand and solidify for 24 hours.

[0079] e. Complete the potting glue operation at one end. After the potting glue is solidified, turn the housing together with the tubular membrane element 10 to be tested around, and repeat step d to perform the potting glue operation at the other end;

[0080] S5. After both ends are potted and cured, the outer periphery of both ends of the tubular membrane element 10 to be tested is cut, and the flexible tubular membrane for testing is manufactured;

[0081] Before cutting the glue in step S5, wait until both ends are cured for more than 24 hours, then carefully rotate and remove the glue potting fixtures 50 at both ends. Since petroleum jelly is applied inside the internal threaded pipe cap 51, the potting glue does not adhere to the inner surface of the internal threaded pipe cap 51, and can be removed from the threaded connection. After removal, the glue is cut. The glue cutting parts are the two ends of the tubular membrane element 10 to be tested and the outer periphery of the upper half 21 of the movable joint at both ends. Use an electric cutting machine to cut off the epoxy glue outside the outer edge of the movable joint at both ends of the shell, clean up the residue, and grind the burrs. The flexible tubular membrane for the experiment is completed.

[0082] When the tubular membrane element to be tested is tested, the seal of at least one end of the tubular membrane element to be tested 10 is opened, and a membrane filtration communication channel is formed through the water inlet and outlet. After the tubular membrane element to be tested 10 is tested, if the internal tubular membrane element to be tested 10 is blocked, damaged, or cannot be used for other reasons and needs to be replaced, the upper half 21 of the flexible joint is separated from the lower half 22 of the flexible joint by external force, and the tubular membrane element to be tested 10 is cut off. After that, only a new tubular membrane and two sets of upper half 21 of the flexible joint need to be replaced, and steps S3-S5 can be repeated to re-make a new flexible tubular membrane for the experiment. Specific embodiment 2

[0084] S1. The tubular membrane element 10 to be tested is a tubular membrane with an outer diameter of 20 mm and a length of 555 mm. Both ends of the tubular membrane are sealed with ABS plastic caps;

[0085] S2, select two center tubes 30, size DN32, material SS306, length 200mm each, both ends are external thread interface, thread size 1-1 / 4 inches, select one tee joint 40, size DN32, material SS306, interface is internal thread, size 1-1 / 4 inches (matching the center tube), select two sets of union assemblies 20, size DN32, material SS304, one end is external thread interface, the other end is internal thread interface, thread size 1-1 / 4 inches;

[0086] S3, the facing ends of the two central tubes 30 are respectively connected to the three-way joint 40 by threaded connection, and the other ends of the two central tubes 30 are respectively connected to the lower half of the joint 22 by threaded connection, and the axial ends of the housing are respectively provided with corresponding upper half of the joint 21 connected by thread, and the external connection interface 212 of the upper half of the joint 21 is arranged at the corresponding end side;

[0087] S4. After the shell is assembled, the tubular membrane element 10 to be tested is placed inside the shell, and the two axial ends of the tubular membrane element 10 to be tested are respectively convex, and a sealing connection is formed by the potting glue and the inner wall of the upper half 21 of the movable joint, wherein the potting glue is a common potting material such as epoxy glue or polyurethane glue, and the inner edge depth of the potting glue is not greater than the depth of the upper half 21 of the movable joint;

[0088] The tubular membrane element 10 to be tested extends out of the housing by 15 mm, and the ports at both ends of the length direction of the tubular membrane element 10 to be tested are pre-sealed.

[0089] In step S4, a glue potting device is used to perform the glue potting operation. The glue potting device 50 includes an internal threaded pipe cap 51, a glue inlet pipe 52, and a quick-connect connector 53. The size of the internal threaded pipe cap 51 is DN32, the material is PVC, and the size of the internal thread is 1-1 / 4 inches. The internal threaded pipe cap 51 is threadedly connected to the external interface 212 of the upper half of the union 21. After the internal threaded pipe cap 51 is screwed onto the upper half of the union, the corresponding end of the tubular membrane element 10 to be tested is located in the inner cavity of the end plate of the internal threaded pipe cap 51. A 1 / 8-inch hole is provided on the end plate of the internal threaded pipe cap 51 as an inlet. The glue hole is fixed with a quick-insert connector 53, which is a threaded straight-through quick-insert connector made of brass with a thread size of 1 / 8 inch. The quick-insert size is adapted to an 8mm air pipe. The glue inlet pipe 52 uses a PU air pipe with an outer diameter of 8mm and a length of 20cm. The quick-insert connector 53 is connected to one end of the glue inlet pipe 52, and the other end of the glue inlet pipe 52 is externally connected to a glue inlet container. The quick-insert connector 53 is connected to the bottom glue inlet hole of the internal threaded pipe cap 51, and the glue inlet pipe 52 is inserted into the quick-insert connector 53 to form a glue filling fixture 50. Two sets of glue filling fixtures 50 are made in total.

[0090] When the potting glue is operated, the specific steps are as follows:

[0091] a. Before pouring the glue, use 80-grit sandpaper to roughen the inner ring surface of the two upper joints 21 used for the shell to increase the bonding strength of the potting glue;

[0092] b. Place the housing vertically, and place the tubular membrane element 10 to be tested into the housing and center it;

[0093] c. Apply a layer of vaseline evenly to the external connection interfaces of the upper joints 21 at both ends of the housing and all inner surfaces of the internal threaded cap 51 including the internal thread;

[0094] d. Connect the internal threaded pipe cap 51 to the lower end of the housing through a threaded interface. The height of the threaded screw is 5-6 mm (the height mark can be made in advance), so that the inner bottom surface of the end plate of the internal threaded pipe cap 51 does not touch the bottom of the tubular membrane. Then, glue is poured into the inner cavity formed by the internal threaded pipe cap 51, the upper half of the lower end of the flexible joint 21, and the tubular membrane element 10 to be tested through the glue inlet pipe 52. The glue pouring height does not exceed the length of the upper half of the flexible joint 21. The epoxy potting glue containing glue and curing agent components is used for glue pouring. The glue is poured from the glue inlet 52 using a glue-tipped dropper. The amount of glue poured into each end is 46.6 grams. After pouring, it is left to stand and solidify for 24 hours.

[0095] e. Complete the potting glue operation at one end. After the potting glue is solidified, turn the housing together with the tubular membrane element 10 to be tested around, and repeat step d to perform the potting glue operation at the other end;

[0096] S5. After both ends are potted and cured, the outer periphery of both ends of the tubular membrane element 10 to be tested is cut, and the flexible tubular membrane for testing is manufactured;

[0097] Before cutting the glue in step S5, wait until both ends are cured for more than 24 hours, then carefully rotate and remove the glue potting fixtures 50 at both ends. Since petroleum jelly is applied inside the internal threaded pipe cap 51, the potting glue does not adhere to the inner surface of the internal threaded pipe cap 51, and can be removed from the threaded connection. After removal, the glue is cut. The glue cutting parts are the two ends of the tubular membrane element 10 to be tested and the outer periphery of the upper half 21 of the movable joint at both ends. Use an electric cutting machine to cut off the epoxy glue outside the outer edge of the movable joint at both ends of the shell, clean up the residue, and grind the burrs. The flexible tubular membrane for the experiment is completed.

[0098] When the tubular membrane element 10 to be tested is tested, the seal of at least one end of the tubular membrane element 10 to be tested is opened, and a membrane filtration communication channel is formed through the water inlet and outlet. After the tubular membrane element 10 to be tested is tested, if the internal tubular membrane element 10 to be tested is blocked, damaged, or cannot be used for other reasons and needs to be replaced, the upper half 21 of the flexible joint is separated from the lower half 22 of the flexible joint by external force, and the tubular membrane element to be tested is cut off. After that, only a new tubular membrane and two sets of upper half 21 of the flexible joint need to be replaced, and steps S3-S5 can be repeated to re-make a new flexible tubular membrane for the experiment.

[0099] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0100] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for manufacturing a detachable experimental flexible tubular membrane, characterized in that: It is pre-assembled according to the length and outer diameter of the tubular membrane element to be tested to form a shell with two openings at both ends and a water inlet and outlet in the axial length direction, and two groups of flexible joint components with suitable apertures are selected, each group of flexible joint components includes a flexible upper half and a flexible lower half, and the openings at both ends of the shell are respectively fixed to the corresponding flexible lower half, and then the external thread of the flexible upper half is connected to the corresponding end internal thread of the flexible lower half, so that the flexible upper half is axially convex, and then the tubular membrane element to be tested is inserted into the inner cavity of the shell, and the axial ends of the tubular membrane element to be tested are fixed and sealed to the cavity area of ​​the flexible upper half at the corresponding position by potting glue.

2. The method for manufacturing a detachable experimental flexible tubular membrane according to claim 1, characterized in that: It includes the following steps: S1, measuring the size of the tubular membrane element to be tested; S2, selecting a housing component according to the parameters obtained in step S1, the housing component is at least two center tubes with the same aperture, a three-way joint, an optional straight joint, and two sets of union components, the union components include a union upper half and a union lower half, wherein the connection interfaces of the union upper half and the union lower half, and the connection methods of the exposed external connection interfaces are all external thread interfaces; S3, assembling the housing through the housing assembly obtained in step S2, wherein the axial ends of the housing are respectively provided with corresponding upper half parts of the movable joint, and the external connection interfaces of the upper half parts of the movable joint are arranged at the corresponding end sides; S4. After the shell is assembled, the tubular membrane element to be tested is placed inside the shell, and the axial ends of the tubular membrane element to be tested are respectively convex, and a sealing connection is formed by a potting glue and the inner wall of the upper half of the live joint, wherein the potting glue is a common potting material such as epoxy glue or polyurethane glue, and the inner edge depth of the potting glue is not greater than the depth of the upper half of the live joint; S5. After both ends are potted and cured, the glue is cut on the outer periphery of both ends of the tubular membrane element to be tested, and the production of the flexible tubular membrane for testing is completed.

3. The method for manufacturing a detachable flexible tubular membrane for experiments according to claim 2, characterized in that: In step S4, the length of the tubular membrane element to be inspected extending out of the housing is 10-15 mm, and the ports at both ends of the length direction of the tubular membrane element to be inspected are pre-sealed.

4. The method for manufacturing a detachable flexible tubular membrane for experiments according to claim 2, characterized in that: In step S4, a glue pouring device is used to perform glue pouring operations. The glue pouring device includes an internally threaded pipe cap, a glue inlet pipe, and a quick-connect connector. The internally threaded pipe cap is threadedly connected to the external interface of the upper half of the live joint. After the internally threaded pipe cap is screwed onto the upper half of the live joint, the corresponding end of the tubular membrane element to be tested is located in the inner cavity of the end plate of the internally threaded pipe cap. A glue inlet hole is provided on the end plate of the internally threaded pipe cap. A quick-connect connector is fixed to the glue inlet hole. The quick-connect connector is connected to one end of the glue inlet pipe, and the other end of the glue inlet pipe is externally connected to a glue inlet container.

5. The method for manufacturing a detachable flexible tubular membrane for experiments according to claim 4, characterized in that: When the potting glue is operated, the specific steps are as follows: a. Before pouring the glue, use sandpaper to roughen the inner ring surface of the two upper joints of the shell to increase the adhesion of the potting glue. b. Place the housing vertically and place the tubular membrane element to be tested in the housing and center it; c. Apply a layer of vaseline evenly to the external connection interfaces of the upper half of the joints at both ends of the shell, and all inner surfaces of the internal threaded pipe cap including the internal thread; d. Connect the internal threaded pipe cap to the lower end of the shell through the threaded interface. Pay attention to the height of the internal threaded pipe cap when screwing it, so that the height of the tubular membrane element to be tested protrudes from the shell from the inner bottom surface of the end plate of the internal threaded pipe cap to the lower edge of the shell. Then, glue is poured into the inner cavity formed by the internal threaded pipe cap, the upper half of the lower joint, and the tubular membrane element to be tested through the glue inlet pipe. The glue pouring height shall not exceed the length of the upper half of the joint. e. Complete the potting glue operation on one end. After the potting glue is solidified, turn the housing together with the tubular membrane element to be tested over and repeat step d to perform the potting glue operation on the other end.

6. The method for manufacturing a detachable flexible tubular membrane for experiments according to claim 2, characterized in that: Before cutting the glue in step S5, the glue potting fixture is removed. Since Vaseline is applied inside the internal threaded pipe cap, the potting glue does not adhere to the inner surface of the internal threaded pipe cap and can be removed from the threaded connection. After removal, the glue is cut. The glue cutting parts are the two ends of the tubular membrane element to be tested and the outer periphery of the upper half of the flexible joints at the two ends. After the glue cutting is completed, the test membrane element is completed. Or if the internal thread pipe cap cannot be removed due to various reasons, the internal thread pipe cap can be cut off together with the glue for disposable use.

7. The method for manufacturing a detachable flexible tubular membrane for experiments according to claim 2, characterized in that: When the tubular membrane element to be tested is tested, the seal of at least one end of the tubular membrane element to be tested is opened, and a membrane filtration communication channel is formed through the water inlet and outlet. After the tubular membrane element to be tested is tested, if the internal tubular membrane element to be tested is blocked, damaged, or cannot be used for other reasons and needs to be replaced, the upper half of the joint is separated from the lower half of the joint by external force, and the tubular membrane element to be tested is cut off. After that, only a new tubular membrane and two sets of upper halves of the joint need to be replaced, and steps S3-S5 can be repeated to re-make a new flexible tubular membrane for the experiment.

8. The method for manufacturing a detachable flexible tubular membrane for experiments according to claim 2, characterized in that: The central tube is made of commonly used plastic pipe fittings or metal pipe fittings; The inner diameter of the central tube is 4-10 mm larger than the outer diameter of the tubular membrane; The lengths of all central tubes can be the same or different according to requirements.

9. The method for manufacturing a detachable flexible tubular membrane for experiments according to claim 2, characterized in that: The material of the three-way joint and the optional straight joint is the same as that of the central tube. When the number of central tubes is greater than three, a corresponding straight joint needs to be provided to connect the central tubes; Or if the number of the central tubes is two, only one three-way connector is needed to connect the two sets of central tubes and form a water inlet and outlet.

10. The method for manufacturing a detachable flexible tubular membrane for experiments according to claim 2, characterized in that: The joint connection method between the lower half of the live joint and the corresponding end of the shell is a straight-in interface or a threaded interface. The straight-in interface is connected by gluing, electric welding, hot-melt welding, or a pressure joint according to the selected material. When gluing, suitable glue is selected according to the selected material. The threaded interface is suitable for various materials and is threadedly connected by internal or external threads.

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