High-pressure-difference-resistant reverse osmosis membrane assembly and rolling method thereof

Abstract

The invention discloses a high-pressure-difference-resistant reverse osmosis membrane assembly and a rolling method thereof.The high-pressure-difference-resistant reverse osmosis membrane assembly comprises a cylindrical outer wrapping shell, a one-way double-liquid-inlet type direct flow pipe head is installed at an upper end opening of the cylindrical outer wrapping shell in a threaded mode, and a suspended membrane stabilizing structure is arranged in the portion, below the one-way double-liquid-inlet type direct flow pipe head, of the cylindrical outer wrapping shell; a central water collecting rod which is collinear with the vertical central axis of the cylindrical outer coating shell is mounted at the central position in the suspended membrane stabilizing structure, the top end of the central water collecting rod is a sealed opening, the bottom end of the central water collecting rod is an opening, and a high-pressure-difference-resistant reverse osmosis membrane assembly is rolled on the peripheral surface of the central water collecting rod. The pressure applied to the high-pressure-difference-resistant reverse osmosis membrane assembly in the water inlet process is dispersed, deformation or damage of the membrane in the high-pressure state is reduced, the stable membrane can ensure that the form of the membrane assembly is kept in the long-time operation process, the water flow short circuit phenomenon caused by membrane displacement can be reduced to the maximum extent, and the service life of the membrane assembly is prolonged. The water production quality is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment, in particular to a high pressure difference resistant reverse osmosis membrane component and a rolling method thereof. Background Art

[0002] Reverse osmosis membrane components can be divided into roll type, tube type, plate type and hollow fiber type according to the structural type. Among them, the roll type reverse osmosis membrane component has the advantages of compact structure, large effective membrane area per unit volume, standard and uniform external connection dimensions, convenient replacement, relatively fast manufacturing process, suitable for industrial-scale production and use, and convenient installation and operation, becoming the mainstream industrial product in the industry. The structure of the roll type reverse osmosis membrane component generally consists of three parts: the center rod, the membrane and the water inlet grid component, and the covering shell. The center rod is a porous structure and is the collection and outflow channel of the produced water. The membrane and the grid component are composed of at least one reverse osmosis membrane and a screen. The reverse osmosis membrane and the water inlet grid are stacked on each other, and the membranes are sealed with sealants. Finally, they are rolled up to form a cylindrical membrane component. One end of the membrane assembly is the water inlet, the other end is the concentrated water outlet, and both sides of the center rod are the produced water outlets. When pressure is applied, water molecules enter the membrane through the micropores of the reverse osmosis membrane, while dissolved salts and other impurities are blocked on the outside of the membrane. The filtered produced water flows along the flow channel of the membrane into the center rod and is discharged from the produced water outlet. The concentrated water that fails to pass through the membrane is discharged from the other end of the membrane assembly.

[0003] For example, a high-pressure resistant, easily disassembled pipe network reverse osmosis membrane assembly disclosed in the authorization announcement number CN115945068A includes an upper flange component, a lower flange component, a membrane core, a center rod, a membrane shell, a lower joint, an upper joint and a water production sleeve component, wherein the center rod is an integral strength structural component; the upper flange component and the lower flange component are respectively assembled with the upper joint and the lower joint and sleeved on the center rod; the membrane core is sleeved on the center rod, and the two ends are respectively matched with the upper flange and the lower flange; the membrane shell is matched with the upper flange component, the lower flange component and the membrane core; the water production sleeve component is matched with the lower flange component and the center rod, and double sealing is performed in the radial and axial directions to ensure Reliability of sealing; the membrane shell locking method adopts two symmetrical membrane shell pressing blocks to replace the flange gasket and membrane shell pressing ring of the conventional STRO membrane assembly, which saves the time of disassembly and assembly of the membrane assembly. However, during the use of the above technical solution, the maximum hydraulic resistance that the water inlet grid of a single ordinary 8-inch reverse osmosis membrane assembly can withstand is about 1 kg. With the use of the reverse osmosis membrane assembly, the water inlet flow grid will be blocked by pollutants in the water during use, causing the pressure difference between the sections of the reverse osmosis system to increase rapidly. At this time, once the hydraulic resistance exceeds 1 kg significantly, the water inlet grid will rush out of the membrane assembly, causing damage to the membrane assembly, thereby affecting the normal use of the reverse osmosis equipment. Summary of the invention

[0004] The purpose of the present invention is to provide a high-pressure differential resistant reverse osmosis membrane assembly and a rolling method thereof, and a one-way double-liquid-inlet direct current pipe head and a lower sealing cover are respectively added at both ends of a cylindrical outer covering shell. When the high-pressure differential resistant reverse osmosis membrane assembly and a central water collecting rod are rolled and loaded into the cylindrical outer covering shell, the suspended membrane stabilizing structure at the upper end of the cylindrical outer covering shell and the conical-mouthed push sleeve in the lower sealing cover are supported at both ends of the high-pressure differential resistant reverse osmosis membrane assembly to ensure the stability of the high-pressure differential resistant reverse osmosis membrane assembly and the central water collecting rod, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a high pressure difference resistant reverse osmosis membrane assembly, comprising:

[0006] A cylindrical outer covering shell, wherein the upper port of the cylindrical outer covering shell is threadedly installed with a unidirectional double-liquid-inlet direct current pipe head, and a suspended film-stabilizing structure is arranged inside the cylindrical outer covering shell below the unidirectional double-liquid-inlet direct current pipe head, and a central water-collecting rod collinear with the vertical central axis of the cylindrical outer covering shell is installed at the central position inside the suspended film-stabilizing structure, the top end of the central water-collecting rod is sealed, and the bottom end of the central water-collecting rod is open, and the outer peripheral surface of the central water-collecting rod is rolled with a high-pressure difference resistant reverse osmosis membrane assembly, and a water-blocking ring is fixed at one end of the surface of the high-pressure difference resistant reverse osmosis membrane assembly, and the water-blocking ring divides the interior of the cylindrical outer covering shell into an upper cavity and a lower cavity;

[0007] A lower sealing cover, wherein the lower sealing cover is bolted and fixed to the bottom end of the cylindrical outer covering shell, a water outlet nozzle is installed at the central position inside the lower sealing cover, the top end of the water outlet nozzle is connected to the bottom end opening of the central water collecting rod, a cone-mouthed top push sleeve is installed inside the lower sealing cover, the top end of the cone-mouthed top push sleeve and the bottom end of the high pressure difference resistant reverse osmosis membrane assembly abut against each other, a wastewater collecting chamber is arranged inside the cylindrical outer covering shell on one side of the cone-mouthed top push sleeve, the wastewater collecting chamber and the lower cavity are connected to each other, a drainage elbow is installed on the outer wall of the cylindrical outer covering shell on the other side of the cone-mouthed top push sleeve, and one end of the drainage elbow extends to the interior of the wastewater collecting chamber.

[0008] Preferably, a foot column extending downward is integrally formed at the corner position of the bottom end of the lower sealing cover, an internal threaded countersunk hole extending upward is installed inside the foot column, and a rubber pad is bonded to the bottom end of the foot column.

[0009] Preferably, two sealing rings are inlaid on the inner wall of the cone-mouth push sleeve, and an annular groove for the sealing ring to be embedded is provided at one end of the surface of the central water collecting rod.

[0010] Preferably, the unidirectional double-liquid-inlet direct current pipe head includes an upper pipe head threadedly mounted on the upper port of a cylindrical outer covering shell, an upper diverter pipe and a lower diverter pipe integrally formed on the outer wall on the same side of the upper pipe head, and a unidirectional flow guide structure installed inside the upper diverter pipe and the lower diverter pipe, and a vertical water collecting chamber is arranged on the vertical center axis of the upper pipe head, and the vertical water collecting chamber and the upper diverter pipe and the lower diverter pipe are connected to each other.

[0011] Preferably, an internal thread groove is provided on the inner wall of the upper tube head, and an external thread groove for matching with the internal thread groove is provided on the outer wall of the upper port of the cylindrical outer covering shell.

[0012] Preferably, the suspended membrane stabilizing structure includes a partition plate integrally formed on the inner wall of the cylindrical outer covering shell below the upper tube head and arc-shaped liquid guide grooves arranged on both sides of the partition plate, and a support platform is arranged at the center position of the suspended membrane stabilizing structure between the two arc-shaped liquid guide grooves, and a multi-step annular cutting groove is arranged on the inner wall of the support platform, and a multi-step annular flange for interlocking with the multi-step annular cutting groove is integrally formed on one end of the surface of the central water collecting rod.

[0013] Preferably, the one-way flow guide structure includes a left hollow ring and a right hollow ring integrally formed inside the upper diversion pipe and the lower diversion pipe, and a valve stem installed through the left hollow ring and the right hollow ring, a spring coaxial with the valve stem is installed between the left hollow ring and the right hollow ring, two valve plates are fixed at one end of the surface of the valve stem, one side outer wall of the valve plate is fixedly connected to one end of the spring, and the other side outer wall of the valve plate and the one side outer wall of the right hollow ring are in contact with each other.

[0014] Preferably, the high pressure difference resistant reverse osmosis membrane assembly consists of a reverse osmosis membrane, a water inlet grid and a produced water flow guide cloth. The membrane surfaces of the reverse osmosis membrane are folded toward each other to form a double-layer membrane structure. The water inlet grid is located between the relatively folded double layers of the reverse osmosis membrane. The produced water flow guide cloth is adhesively mounted on the other membrane surface of the reverse osmosis membrane. The produced water flow guide cloth, the reverse osmosis membrane and the water inlet grid are wound on a central water collecting rod.

[0015] Preferably, the central water collecting rod is made of a hard plastic material, and the surface of the water inlet grid is provided with parallel grids, diamond grids or corrugated grids.

[0016] The present invention also provides a method for rolling a high pressure difference resistant reverse osmosis membrane assembly, such as the high pressure difference resistant reverse osmosis membrane assembly described above, comprising the following steps:

[0017] S101: Design a fixture with a central tube sealing ring and a negative pressure extraction interface. The negative pressure extraction interface and the vacuum pump are connected through a pipeline. After the polyurethane sealant operation of the high-pressure difference resistant reverse osmosis membrane assembly is completed and before the rolling begins, turn on the vacuum pump to vacuum the high-pressure difference resistant reverse osmosis membrane assembly to a vacuum degree of minus 0.02-minus 0.07Mpa. Then, the membrane assembly is rolled to form a cylindrical membrane assembly structure.

[0018] S102: Assemble the central water collecting rod wound with the high pressure difference resistant reverse osmosis membrane assembly into the interior of the cylindrical outer covering shell, and connect the upper ends of the central water collecting rod and the high pressure difference resistant reverse osmosis membrane assembly to the suspended membrane stabilizing structure to ensure that the high pressure difference resistant reverse osmosis membrane assembly and the central water collecting rod are in the correct position in the cylindrical outer covering shell, and the sealing portion at the top of the central water collecting rod is coaxial with the water inlet channel in the cylindrical outer covering shell to facilitate the subsequent water flow introduction;

[0019] S103: The staff assembles the cylindrical outer covering shell and the one-way double liquid inlet direct current pipe head by screwing until the sealing portion at the top end of the central water collecting rod enters into the one-way double liquid inlet direct current pipe head;

[0020] S104: Install the lower sealing cover to the bottom end of the cylindrical outer covering shell by bolting. The sealing performance between the lower sealing cover and the cylindrical outer covering shell directly affects the overall sealing performance of the mold system. During installation, a sealing ring can be installed on the joint surface of the lower sealing cover and the cylindrical outer covering shell. It is necessary to ensure that the sealing ring is positioned correctly. Use a torque wrench to tighten the cylindrical outer covering shell and the lower sealing cover according to the specified torque value to ensure the sealing effect of the lower sealing cover. During the installation of the lower sealing cover, use epoxy glue to seal the gap between the central water collecting rod and the outer wall of the lower sealing cover.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: the high-pressure differential resistant reverse osmosis membrane assembly and the rolling method thereof are provided by adding a unidirectional double-liquid-inlet direct current pipe head and a lower sealing cover at both ends of the cylindrical outer covering shell, and designing a suspended membrane stabilizing structure and a cone-mouth top push sleeve inside. The unidirectional double-liquid-inlet direct current pipe head and the suspended membrane stabilizing structure can effectively disperse the pressure applied to the high-pressure differential resistant reverse osmosis membrane assembly during the water inlet process, and reduce the deformation or damage of the diaphragm under high pressure. The stable diaphragm can not only ensure that the shape of the membrane assembly is maintained during long-term operation, but also minimize the water flow short-circuit phenomenon caused by the displacement of the diaphragm, thereby ensuring the quality of produced water. When the influent contains a large amount of pollutants, the high-pressure differential resistant reverse osmosis membrane assembly is located between the suspended membrane stabilizing structure and the cone-mouth top push sleeve. The suspended membrane stabilizing structure and the cone-mouth top push sleeve are tightly combined with the two ends of the membrane assembly, and can effectively resist the changes in internal and external pressures under high pressure differential conditions. It provides additional support and enhances the ability of the membrane assembly to resist failure caused by hydraulic impact and stress concentration, thereby effectively extending the service life of the membrane and ensuring the continuous stability of water flow and water quality during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the main cross-sectional structure of the present invention;

[0023] Figure 2 It is a schematic diagram of a three-dimensional cross-sectional structure of the present invention;

[0024] Figure 3 The three-dimensional structure of the present invention is shown in FIG. Figure 1 ;

[0025] Figure 4 The three-dimensional structure of the present invention is shown in FIG. Figure 2 ;

[0026] Figure 5 The three-dimensional structure of the present invention is shown in FIG. Figure 3 ;

[0027] Figure 6 It is a schematic diagram of a three-dimensional cross-sectional structure of a second embodiment of the present invention;

[0028] Figure 7 Schematic diagram of the three-dimensional cross-sectional structure of a cylindrical outer covering shell according to the third embodiment of the present invention;

[0029] Figure 8 This is a schematic diagram of a three-dimensional cross-sectional structure of a one-way double-liquid-inlet direct current pipe head according to the third embodiment of the present invention;

[0030] Fig. 9 Schematic diagram of the unfolded three-dimensional structure of the reverse osmosis membrane assembly of the fourth embodiment of the present invention Figure 1 ;

[0031] Fig.10Schematic diagram of the unfolded three-dimensional structure of the reverse osmosis membrane assembly of the fourth embodiment of the present invention Figure 2 .

[0032] In the figure: 1, cylindrical outer covering shell; 101, external thread groove; 102, water blocking ring; 2, unidirectional double-inlet direct current pipe head; 201, upper pipe head; 202, internal thread groove; 203, vertical water collecting chamber; 204, upper shunt pipe; 205, lower shunt pipe; 206, unidirectional flow guide structure; 3, high pressure difference resistant reverse osmosis membrane assembly; 301, reverse osmosis membrane; 302, water inlet grid; 303, production Water flow guide cloth; 4. Suspended membrane stabilizing structure; 401. Partition plate; 402. Arc-shaped liquid guide groove; 403. Support platform; 404. Multi-step annular cut-out groove; 405. Multi-step annular flange; 5. Center water collecting rod; 501. Conical mouth push sleeve; 502. Sealing ring; 6. Wastewater collecting chamber; 7. Lower sealing cover; 701. Foot column; 702. Rubber pad; 8. Water outlet; 9. Drain elbow. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Embodiment 1, by Figures 1 to 5 The present invention comprises a cylindrical outer covering shell 1, an upper port of the cylindrical outer covering shell 1 is threadedly installed with a unidirectional double-liquid-inlet direct current pipe head 2, and a suspended membrane stabilizing structure 4 is arranged inside the cylindrical outer covering shell 1 below the unidirectional double-liquid-inlet direct current pipe head 2, a central water collecting rod 5 which is collinear with the vertical central axis of the cylindrical outer covering shell 1 is installed at the central position inside the suspended membrane stabilizing structure 4, the top end of the central water collecting rod 5 is sealed, the bottom end of the central water collecting rod 5 is open, the outer peripheral surface of the central water collecting rod 5 is rolled with a high-pressure difference resistant reverse osmosis membrane assembly 3, one end of the surface of the high-pressure difference resistant reverse osmosis membrane assembly 3 is fixed with a water blocking ring 102, and the water blocking ring 102 divides the interior of the cylindrical outer covering shell 1 into an upper chamber and a lower chamber;

[0035] The lower sealing cover 7 is bolted and fixed to the bottom end of the cylindrical outer covering shell 1. The lower sealing cover 7 ensures the bottom sealing of the cylindrical outer covering shell 1 to prevent the cross contamination of raw water and fresh water and the leakage of concentrated water;

[0036] A water outlet nozzle 8 is installed at the central position inside the lower sealing cover 7, and the top of the water outlet nozzle 8 is connected to the bottom opening of the central water collecting rod 5. A cone-shaped top push sleeve 501 is installed inside the lower sealing cover 7, and the top of the cone-shaped top push sleeve 501 and the bottom end of the high-pressure difference resistant reverse osmosis membrane assembly 3 are abutted against each other. A wastewater collecting chamber 6 is arranged inside the cylindrical outer covering shell 1 on one side of the cone-shaped top push sleeve 501, and the wastewater collecting chamber 6 and the lower cavity are connected to each other. A drainage elbow 9 is installed on the outer wall of the cylindrical outer covering shell 1 on the other side of the cone-shaped top push sleeve 501, and one end of the drainage elbow 9 extends to the inside of the wastewater collecting chamber 6;

[0037] The bottom corner of the lower sealing cover 7 is integrally formed with a foot column 701 extending downward, the inside of the foot column 701 is provided with an internal threaded countersunk hole extending upward, and the bottom end of the foot column 701 is bonded with a rubber pad 702;

[0038] At the beginning of raw water treatment, the raw water enters the cylindrical outer covering shell 1 through the unidirectional double-liquid inlet direct current pipe head 2. The pipe head is designed with double liquid inlets, so that water can enter from two directions at the same time, ensuring that the water flow is uniform and stable. The internal structure design of the cylindrical outer covering shell 1 can optimize the water flow distribution, ensuring that the water flow is evenly distributed to each part of the high-pressure difference resistant reverse osmosis membrane assembly 3, thereby improving the filtration efficiency. After the water flow enters the cylindrical outer covering shell 1, it passes through the suspended membrane stabilizing structure 4. The main function of the suspended membrane stabilizing structure 4 is to support the high-pressure difference resistant reverse osmosis membrane assembly 3. , to prevent it from deforming under high pressure, and at the same time ensure that the effective working area of ​​the membrane is fully utilized. Due to the effect of the water blocking ring 102, the raw water enters the high pressure difference resistant reverse osmosis membrane assembly 3 one by one at the upper position of the cylindrical outer covering shell 1. After entering the high pressure difference resistant reverse osmosis membrane assembly 3, the water flows through the membrane surface. The tiny pore size of the high pressure difference resistant reverse osmosis membrane assembly 3 can effectively block impurities, bacteria, salt and other dissolved substances in the water, and only allow water molecules to pass through. After the raw water is filtered by the high pressure difference resistant reverse osmosis membrane assembly 3, most of the pollutants can be removed to achieve water purification;

[0039] The filtered water is "fresh water", which flows to the central water collecting rod 5 through the outlet side of the high-pressure differential reverse osmosis membrane assembly 3. The central water collecting rod 5 effectively collects the fresh water generated by the high-pressure differential reverse osmosis membrane assembly 3 and guides it to the downstream of the system, that is, it is discharged from the water outlet 8. In contrast to the fresh water, there is residual concentrated water concentrated after being filtered by the high-pressure differential reverse osmosis membrane assembly 3. This part of water contains impurities and salts blocked by the high-pressure differential reverse osmosis membrane assembly 3, and flows to the wastewater collecting chamber 6. The concentrated water is smoothly discharged through the drainage elbow 9 through the guiding effect of the tapered top push sleeve 501. The tapered top push sleeve 501 can not only guide the water flow, but also provide additional support at the lower end of the high-pressure differential reverse osmosis membrane assembly 3 to prevent the membrane assembly from being deformed due to high pressure.

[0040] A method for rolling a high pressure differential resistant reverse osmosis membrane assembly according to the present embodiment, such as the high pressure differential resistant reverse osmosis membrane assembly described above, comprises the following steps:

[0041] S101: Design a fixture with a central tube sealing ring and a negative pressure extraction interface, the negative pressure extraction interface and the vacuum pump are connected through a pipeline, after the polyurethane sealant operation of the high pressure difference resistant reverse osmosis membrane assembly 3 is completed and before the rolling begins, turn on the vacuum pump to vacuum the high pressure difference resistant reverse osmosis membrane assembly 3, and extract the vacuum degree to minus 0.02-minus 0.07Mpa, and then roll the membrane assembly to make a cylindrical membrane assembly structure;

[0042] S102: Assemble the central water collecting rod 5 wound with the high pressure difference resistant reverse osmosis membrane assembly 3 into the interior of the cylindrical outer covering shell 1, and connect the upper ends of the central water collecting rod 5 and the high pressure difference resistant reverse osmosis membrane assembly 3 with the suspended membrane stabilizing structure 4 to ensure that the high pressure difference resistant reverse osmosis membrane assembly 3 and the central water collecting rod 5 are in the correct position in the cylindrical outer covering shell 1, and the sealing portion at the top of the central water collecting rod 5 is coaxial with the water inlet channel in the cylindrical outer covering shell 1 to facilitate the subsequent water flow introduction;

[0043] S103: The staff assembles the cylindrical outer covering shell 1 and the one-way double-liquid inlet direct current pipe head 2 by screwing until the sealing portion at the top of the central water collecting rod 5 enters into the one-way double-liquid inlet direct current pipe head 2;

[0044] S104: Install the lower sealing cover 7 to the bottom end of the cylindrical outer covering shell 1 in a bolted manner. The sealing performance between the lower sealing cover 7 and the cylindrical outer covering shell 1 directly affects the overall sealing performance of the mold system. During installation, a sealing ring can be installed on the joint surface of the lower sealing cover 7 and the cylindrical outer covering shell 1. It is necessary to ensure that the sealing ring is in the correct position. Use a torque wrench to tighten the cylindrical outer covering shell 1 and the lower sealing cover 7 according to the specified torque value to ensure the sealing effect of the lower sealing cover 7. During the installation of the lower sealing cover 7, use epoxy glue to seal the gap between the central water collecting rod 5 and the outer wall of the lower sealing cover 7.

[0045] Embodiment 2, based on embodiment 1, Figure 6 It is shown that two sealing rings 502 are inlaid on the inner wall of the cone-mouth top push sleeve 501, and one end of the surface of the central water-collecting rod 5 is provided with an annular groove for the sealing ring 502 to be embedded. After the cone-mouth top push sleeve 501 and the central water-collecting rod 5 are assembled, the sealing ring 502 is located in the contact surface gap between the cone-mouth top push sleeve 501 and the central water-collecting rod 5, which keeps the lower end of the central water-collecting rod 5 in a sealed state to prevent the concentrated water in the wastewater collecting chamber 6 from seeping out from the central water-collecting rod 5, the cone-mouth top push sleeve 501 and the water outlet 8.

[0046] Embodiment 3, based on embodiment 1, Figure 7 and Figure 8It is given that the unidirectional double-liquid-inlet direct current pipe head 2 includes an upper pipe head 201 threadedly mounted on the upper port of the cylindrical outer covering shell 1, an upper shunt pipe 204 and a lower shunt pipe 205 integrally formed on the outer wall on the same side of the upper pipe head 201, and a unidirectional flow guide structure 206 installed inside the upper shunt pipe 204 and the lower shunt pipe 205, a vertical water collecting chamber 203 is arranged on the vertical central axis of the upper pipe head 201, the vertical water collecting chamber 203 and the upper shunt pipe 204 and the lower shunt pipe 205 are connected to each other, an internal thread groove 202 is arranged on the inner wall of the upper pipe head 201, and an external thread groove 101 for matching with the internal thread groove 202 is arranged on the outer wall of the upper port of the cylindrical outer covering shell 1;

[0047] The one-way double-liquid inlet direct current pipe head 2 cooperates with the external thread groove 101 at the upper end of the cylindrical outer covering shell 1 through the upper pipe head 201, until the upper pipe head 201 and the cylindrical outer covering shell 1 are screwed into place, at which time the upper shunt pipe 204 and the lower shunt pipe 205 can be connected to the external raw water supply end, so that the raw water in the upper shunt pipe 204 and the lower shunt pipe 205 is concentrated in the vertical water collection chamber 203 through the one-way flow guide structure 206, and flows toward the position of the high-pressure difference resistant reverse osmosis membrane assembly 3 and the suspended stabilizing membrane structure 4, which allows the two inlet water flows to evenly enter the high-pressure difference resistant reverse osmosis membrane assembly 3 to reduce the risk of local high pressure difference;

[0048] The one-way flow guide structure 206 includes a left hollow ring and a right hollow ring integrally formed inside the upper shunt pipe 204 and the lower shunt pipe 205, and a valve stem installed through the left hollow ring and the right hollow ring. A spring coaxial with the valve stem is installed between the left hollow ring and the right hollow ring. Two valve plates are fixed at one end of the valve stem surface. The outer wall of one side of the valve plate is fixedly connected to one end of the spring. The outer wall of the other side of the valve plate and the outer wall of one side of the right hollow ring abut against each other. The one-way flow guide structure 206 can effectively control the direction of the water flow, ensure that the water flow always flows along the predetermined path, and reduce the vortex and backflow of raw water when entering and exiting the pipe head.

[0049] The suspended membrane stabilizing structure 4 includes a partition plate 401 integrally formed on the inner wall of the cylindrical outer covering shell 1 below the upper tube head 201 and arc-shaped liquid guide grooves 402 arranged on both sides of the partition plate 401. Raw water enters the high pressure difference resistant reverse osmosis membrane assembly 3 through the arc-shaped liquid guide grooves 402.

[0050] A support platform 403 is arranged at the center position of the suspended membrane stabilizing structure 4 between the two arc-shaped liquid guiding grooves 402, and a multi-step annular cut-out groove 404 is arranged on the inner wall of the support platform 403. A multi-step annular flange 405 for interlocking with the multi-step annular cut-out groove 404 is integrally formed at one end of the surface of the central water collecting rod 5. When the central water collecting rod 5 cooperates with the suspended membrane stabilizing structure 4, the multi-step annular flange 405 on the outer wall of the central water collecting rod 5 and the multi-step annular cut-out groove 404 on the inner wall of the support platform 403 are interlocked with each other, so that the vertical center axis of the high-pressure difference resistant reverse osmosis membrane assembly 3 and the central water collecting rod 5 coincide with the center axis of the cylindrical outer covering shell 1. By suspending and fixing the high-pressure difference resistant reverse osmosis membrane assembly 3 and the central water collecting rod 5, displacement or vibration under high-pressure conditions is prevented, so that the high-pressure difference resistant reverse osmosis membrane assembly 3 and the central water collecting rod 5 maintain the correct position and shape during use, and reduce the movement caused by excessive water pressure.

[0051] Embodiment 4, based on embodiment 3, Fig. 9 and Fig.10 It is given that the high pressure difference resistant reverse osmosis membrane assembly 3 is composed of a reverse osmosis membrane 301, a water inlet grid 302 and a produced water flow guide cloth 303. The membrane surfaces of the reverse osmosis membrane 301 are folded in opposite directions to form a double-layer membrane structure. The water inlet grid 302 is located between the relatively folded double-layer reverse osmosis membranes 301. The produced water flow guide cloth 303 is adhesively mounted on the other membrane surface of the reverse osmosis membrane 301. The produced water flow guide cloth 303, the reverse osmosis membrane 301 and the water inlet grid 302 are wound on a central water collecting rod 5. The central water collecting rod 5 is made of a hard plastic material. The surface of the water inlet grid 302 is provided with parallel grids, diamond grids or corrugated grids.

[0052] The water inlet grid 302 is placed between two layers of reverse osmosis membrane 301. The two layers of reverse osmosis membrane 301 are formed by folding a membrane surface in half. The reverse osmosis membrane 301 and the water inlet grid 302 together constitute a reverse osmosis membrane group, and the water production flow guide cloth 303 is attached to the outer surface of the reverse osmosis membrane 301. The edges of the reverse osmosis membrane 301 and the water production flow guide cloth 303 are sealed by sealant, and finally rolled around the central water collecting rod 5 to form a cylindrical membrane assembly. After rolling, the friction resistance between the reverse osmosis membrane 301 and the water inlet grid 302 is used to resist the hydraulic resistance of the water inlet to the grid, and the fresh water generated after filtration flows to the central water collecting rod 5 and is discharged from the bottom end of the central water collecting rod 5 and the water outlet 8.

[0053] When the embodiment of the present application is in use, first, the cylindrical outer covering shell 1 is the external protective part of the entire membrane assembly, ensuring the stability and safety of the internal membrane, and the high-pressure difference resistant reverse osmosis membrane assembly 3 is inside the cylindrical outer covering shell 1, and it is made with the central water collecting rod 5 by rolling, and has rigidity and high-pressure difference resistance. Subsequently, the staff will assemble the central water collecting rod 5 wound with the high-pressure difference resistant reverse osmosis membrane assembly 3 into the interior of the cylindrical outer covering shell 1, and make the upper end of the central water collecting rod 5 and the high-pressure difference resistant reverse osmosis membrane assembly 3 connected to the suspended stabilizing membrane structure 4. In this process, it is necessary to ensure that the high-pressure difference resistant reverse osmosis membrane assembly 3 and the central water collecting rod 5 are in the correct position in the cylindrical outer covering shell 1, and the top of the central water collecting rod 5 The sealing part is coaxial with the water inlet channel in the cylindrical outer covering shell 1 to facilitate the subsequent water flow introduction. The suspended membrane stabilizing structure 4 is located at the upper ends of the high-pressure difference resistant reverse osmosis membrane assembly 3 and the central water collecting rod 5, providing necessary structural support to ensure that the high-pressure difference resistant reverse osmosis membrane assembly 3 will not be deformed by the water flow pressure during operation, and can effectively disperse the pressure under high hydraulic conditions to reduce the damage of the diaphragm due to uneven pressure. At the same time, the suspended membrane stabilizing structure 4 can also ensure that the high-pressure difference resistant reverse osmosis membrane assembly 3 and the central water collecting rod 5 do not have any tilt when they are installed inside the cylindrical outer covering shell 1. Subsequently, the staff screwed the cylindrical outer covering shell 1 and the one-way double-liquid inlet direct current pipe head 2 in a threaded manner. Assemble until the sealing part at the top of the central water collecting rod 5 enters into the one-way double liquid inlet direct current pipe head 2. The one-way double liquid inlet direct current pipe head 2 allows the water flow to be better distributed when entering the high pressure difference resistant reverse osmosis membrane component 3 through two water inlets, reducing the unevenness of the water flow, thereby reducing the risk of local high pressure difference, which helps to improve the utilization efficiency of the membrane and reduce the pollution and scaling of the local membrane surface. After completing the installation of the above components, the last step is to bolt the lower sealing cover 7 to the bottom end of the cylindrical outer covering shell 1. The sealing performance between the lower sealing cover 7 and the cylindrical outer covering shell 1 directly affects the overall sealing performance of the mold system. During installation, the lower sealing cover 7 and the cylindrical outer covering shell 1 can be bolted together. When installing the sealing ring on the joint surface, it is necessary to ensure that the sealing ring is in the correct position. Use a torque wrench to tighten the cylindrical outer covering shell 1 and the lower sealing cover 7 according to the specified torque value to ensure the sealing effect of the lower sealing cover 7. At this time, the tapered top push sleeve 501 inside the lower sealing cover 7 will be pressed against the lower end of the high-pressure difference reverse osmosis membrane assembly 3, and the tapered top push sleeve 501 and the central water collecting rod 5 are assembled together. Through the above steps, the correct assembly of the unidirectional double-liquid-inlet direct current pipe head 2, the cylindrical outer covering shell 1, the suspended membrane stabilizing structure 4, the high-pressure difference reverse osmosis membrane assembly 3, the central water collecting rod 5, the tapered top push sleeve 501 and the lower sealing cover 7 can be ensured. After the assembly is completed, check the sealing of all joints to ensure that there is no water leakage.

[0054] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0055] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high pressure differential resistant reverse osmosis membrane assembly, characterized in that: include: A cylindrical outer covering shell (1), wherein a unidirectional double-liquid inlet direct current pipe head (2) is threadedly mounted on an upper port of the cylindrical outer covering shell (1), and a suspended membrane stabilizing structure (4) is arranged inside the cylindrical outer covering shell (1) below the unidirectional double-liquid inlet direct current pipe head (2), wherein a central water collecting rod (5) colinear with the vertical central axis of the cylindrical outer covering shell (1) is installed at a central position inside the suspended membrane stabilizing structure (4), wherein the top end of the central water collecting rod (5) is sealed, and the bottom end of the central water collecting rod (5) is open, and a high-pressure differential resistant reverse osmosis membrane assembly (3) is rolled on the outer peripheral surface of the central water collecting rod (5), and a water blocking ring (102) is fixed on one end of the surface of the high-pressure differential resistant reverse osmosis membrane assembly (3), and the water blocking ring (102) divides the interior of the cylindrical outer covering shell (1) into an upper chamber and a lower chamber; A lower sealing cover (7) is bolted and fixed to the bottom end of the cylindrical outer covering shell (1); a water outlet nozzle (8) is installed at the central position inside the lower sealing cover (7); the top end of the water outlet nozzle (8) is connected to the bottom end opening of the central water collecting rod (5); a cone-shaped top push sleeve (501) is installed inside the lower sealing cover (7); the top end of the cone-shaped top push sleeve (501) and the bottom end of the high-pressure difference resistant reverse osmosis membrane assembly (3) are abutted against each other; a wastewater collection chamber (6) is arranged inside the cylindrical outer covering shell (1) on one side of the cone-shaped top push sleeve (501); the wastewater collection chamber (6) and the lower cavity are connected to each other; a liquid discharge elbow (9) is installed on the outer wall of the cylindrical outer covering shell (1) on the other side of the cone-shaped top push sleeve (501); one end of the liquid discharge elbow (9) extends to the inside of the wastewater collection chamber (6).

2. A high pressure differential resistant reverse osmosis membrane assembly according to claim 1, characterized in that: A foot column (701) extending downward is integrally formed at the corner position of the bottom end of the lower sealing cover (7), an internal threaded countersunk hole extending upward is installed inside the foot column (701), and a rubber pad (702) is bonded to the bottom end of the foot column (701).

3. A high pressure differential resistant reverse osmosis membrane assembly according to claim 1, characterized in that: Two sealing rings (502) are inlaid on the inner wall of the cone-mouth push sleeve (501), and an annular groove for the sealing ring (502) to be embedded is provided on one end of the surface of the central water collecting rod (5).

4. A high pressure differential resistant reverse osmosis membrane assembly according to claim 1, characterized in that: The one-way double-liquid-inlet direct current pipe head (2) comprises an upper pipe head (201) threadedly mounted on an upper port of a cylindrical outer covering shell (1), an upper shunt pipe (204) and a lower shunt pipe (205) integrally formed on the outer wall on the same side of the upper pipe head (201), and a one-way flow guide structure (206) installed inside the upper shunt pipe (204) and the lower shunt pipe (205); a vertical water collecting chamber (203) is arranged on the vertical center axis of the upper pipe head (201); and the vertical water collecting chamber (203) and the upper shunt pipe (204) and the lower shunt pipe (205) are interconnected.

5. A high pressure differential resistant reverse osmosis membrane assembly according to claim 4, characterized in that: An internal thread groove (202) is provided on the inner wall of the upper tube head (201), and an external thread groove (101) for matching with the internal thread groove (202) is provided on the outer wall of the upper port of the cylindrical outer covering shell (1).

6. A high pressure differential resistant reverse osmosis membrane assembly according to claim 4, characterized in that: The suspended membrane stabilizing structure (4) comprises a partition plate (401) integrally formed on the inner wall of a cylindrical outer covering shell (1) below an upper tube head (201) and arc-shaped liquid guide grooves (402) arranged on both sides of the partition plate (401); a support platform (403) is arranged at the center of the suspended membrane stabilizing structure (4) between the two arc-shaped liquid guide grooves (402); a multi-step annular cut-out groove (404) is arranged on the inner wall of the support platform (403); and a multi-step annular flange (405) for interlocking with the multi-step annular cut-out groove (404) is integrally formed on one end of the surface of the central water collecting rod (5).

7. A high pressure differential resistant reverse osmosis membrane assembly according to claim 6, characterized in that: The one-way flow guide structure (206) includes a left hollow ring and a right hollow ring integrally formed inside the upper shunt pipe (204) and the lower shunt pipe (205), and a valve stem installed through the left hollow ring and the right hollow ring, a spring coaxial with the valve stem is installed between the left hollow ring and the right hollow ring, two valve plates are fixed at one end of the surface of the valve stem, one side outer wall of the valve plate is fixedly connected to one end of the spring, and the other side outer wall of the valve plate and the one side outer wall of the right hollow ring are in contact with each other.

8. A high pressure differential resistant reverse osmosis membrane assembly according to claim 6, characterized in that: The high pressure difference resistant reverse osmosis membrane assembly (3) is composed of a reverse osmosis membrane (301), a water inlet grid (302) and a produced water flow guide cloth (303); the membrane surfaces of the reverse osmosis membrane (301) are folded in opposite directions to form a double-layer membrane structure; the water inlet grid (302) is located between the two folded reverse osmosis membranes (301); the produced water flow guide cloth (303) is adhesively mounted on the other membrane surface of the reverse osmosis membrane (301); and the produced water flow guide cloth (303), the reverse osmosis membrane (301) and the water inlet grid (302) are wound on a central water collecting rod (5).

9. A high pressure differential resistant reverse osmosis membrane assembly according to claim 8, characterized in that: The central water collecting rod (5) is made of a hard plastic material, and the surface of the water inlet grid (302) is provided with parallel grids, diamond grids or corrugated grids.

10. A method for rolling a high pressure differential resistant reverse osmosis membrane assembly, comprising the high pressure differential resistant reverse osmosis membrane assembly according to any one of claims 1 to 9, characterized in that: The following steps are involved: S101: design a fixture with a central tube sealing ring and a negative pressure extraction interface, the negative pressure extraction interface and the vacuum pump are connected through a pipeline, after the polyurethane sealant operation of the high pressure difference resistant reverse osmosis membrane assembly (3) is completed and before the rolling begins, start the vacuum pump to vacuum the high pressure difference resistant reverse osmosis membrane assembly (3) to a vacuum degree of minus 0.02-minus 0.07Mpa, and then roll the membrane assembly to form a cylindrical membrane assembly structure; S102: Assemble the central water collecting rod (5) wound with the high pressure difference resistant reverse osmosis membrane assembly (3) into the interior of the cylindrical outer covering shell (1), and connect the upper ends of the central water collecting rod (5) and the high pressure difference resistant reverse osmosis membrane assembly (3) to the suspended membrane stabilizing structure (4) to ensure that the high pressure difference resistant reverse osmosis membrane assembly (3) and the central water collecting rod (5) are in the correct position in the cylindrical outer covering shell (1), and the sealing portion at the top of the central water collecting rod (5) is coaxial with the water inlet channel in the cylindrical outer covering shell (1) to facilitate the subsequent water flow introduction; S103: The staff assembles the cylindrical outer covering shell (1) and the one-way double-liquid inlet direct current pipe head (2) by screwing, until the sealing portion at the top of the central water collecting rod (5) enters into the one-way double-liquid inlet direct current pipe head (2); S104: The lower sealing cover (7) is bolted to the bottom end of the cylindrical outer covering shell (1). The sealing performance between the lower sealing cover (7) and the cylindrical outer covering shell (1) directly affects the overall sealing performance of the mold system. During installation, a sealing ring can be installed on the joint surface of the lower sealing cover (7) and the cylindrical outer covering shell (1). It is necessary to ensure that the sealing ring is positioned correctly. A torque wrench is used to tighten the cylindrical outer covering shell (1) and the lower sealing cover (7) according to the specified torque value to ensure the sealing effect of the lower sealing cover (7). During the installation of the lower sealing cover (7), the gap between the central water collecting rod (5) and the outer wall of the lower sealing cover (7) is sealed with epoxy glue.

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