Anti-blocking reverse osmosis membrane assembly and water treatment device

Abstract

The utility model relates to water treatment technical field, and disclose a kind of anti-blocking reverse osmosis membrane module and water treatment device, including center water production pipe, multiple membrane bags of being sleeved in the outside of center water production pipe, multiple flow guide disc alternately stacked with membrane bag, and the membrane shell of being sleeved in outermost side, flow guide disc is disc, its front surface is equipped with the convex point of spiral involute formula distribution, the height of convex point increases from flow guide disc center to edge;One end of membrane shell is equipped with water inlet, another end is equipped with concentrated water outlet, one end of center water production pipe is as water production outlet and projects membrane shell, by the unique spiral involute formula convex point flow guide disc design, strong vortex and turbulence are generated in flow channel, effectively destroy concentration polarization layer, so that pollutant is difficult to deposit on membrane surface, significantly reduce the frequency of blockage. The enhancement of turbulence improves mass transfer efficiency simultaneously, help to maintain higher membrane flux and desalination rate.

Description

Technical Field

[0001] This utility model relates to the field of water treatment technology, and in particular to an anti-clogging reverse osmosis membrane module and water treatment device. Background Technology

[0002] Reverse osmosis technology is one of the most advanced water treatment technologies currently available, and it is widely used in seawater desalination, pure water production, wastewater reuse, and other fields. A search revealed a prior art reverse osmosis membrane module with anti-clogging function (publication number: CN217613318U), including a filtration mechanism and a cleaning mechanism. The filtration mechanism includes connecting pipe A and connecting pipe B. Connecting pipe A is connected to the inlet of the reverse osmosis membrane filter tube, and connecting pipe B is connected to a water supply pipe that provides a water source. The inner cavities of connecting pipe A and connecting pipe B are interconnected. Symmetrical limiting rings are provided inside connecting pipe A and connecting pipe B, and a filter screen is sandwiched between the limiting rings. A water supply ring is wrapped around the outside of connecting pipe A. Connecting pipe A has several water inlet channels, and the inward end of each water inlet channel has a spray pipe facing the filter screen. A one-way valve A is provided on the water inlet channel, and a water inlet pipe is provided below the water supply ring. Connecting pipe B has a laser detector above and to the right of the limiting ring, and a waste discharge pipe is provided below and to the right of connecting pipe B. A one-way valve B is provided on the waste discharge pipe, and a waste inlet pipe is connected below the waste discharge pipe. The water inlet pipe and the waste inlet pipe are connected to the cleaning mechanism.

[0003] In the existing technology, disc tube reverse osmosis membrane modules have alleviated the clogging problem to some extent by using a structure in which guide discs and membrane sheets are stacked alternately. However, the structure of its guide discs is usually relatively simple, mostly consisting of dot-like or mesh-like protrusions, which have limited turbulence effect and are not effective in controlling fine colloidal particles and organic pollutants.

[0004] Therefore, we propose an anti-clogging reverse osmosis membrane module and water treatment device. Utility Model Content

[0005] The present invention aims to solve the technical problems existing in the prior art and provide an anti-clogging reverse osmosis membrane module and a water treatment device.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: an anti-clogging reverse osmosis membrane module, comprising a central permeate pipe, multiple membrane bags sleeved outside the central permeate pipe, multiple guide plates alternately stacked with the membrane bags, and a membrane shell sleeved on the outermost side. The guide plates are disc-shaped, with spirally involute distributed protrusions on their front sides, the height of which increases from the center of the guide plate to the edge. One end of the membrane shell is provided with an inlet, and the other end is provided with a concentrate outlet. One end of the central permeate pipe extends out of the membrane shell as a permeate outlet.

[0007] In a preferred embodiment of this utility model, the cross-section of the protrusion is semi-cylindrical, and the height ranges from 0.5mm to 2.0mm.

[0008] As a preferred embodiment of this utility model, the back of the guide plate is provided with a network that matches the protrusions on the front. When multiple guide plates are stacked, the protrusions on the front are engaged with the grooves on the back of the adjacent guide plates.

[0009] As a preferred embodiment of this utility model, the guide plate is made of polyoxymethylene material, and its surface is embedded with elastic support points made of NBR nitrile rubber.

[0010] In a preferred embodiment of this invention, the edge of the guide plate is provided with an annular groove for installing an O-ring seal.

[0011] In a preferred embodiment of this invention, the membrane bag is formed by placing two circular polyamide composite membrane sheets back to back, with the active layers of the two membrane sheets facing outwards, forming a water production channel in the middle, sealed at the edges, and having a hole in the center for the central water production pipe to pass through. A water treatment device includes a water tank, on which all of the above-described anti-clogging reverse osmosis membrane assemblies are provided.

[0012] This invention provides an anti-clogging reverse osmosis membrane module and a water treatment device. It has the following beneficial effects: 1. This anti-clogging reverse osmosis membrane module and water treatment device, through a unique spiral involute convex guide plate design, generates strong vortices and turbulence in the flow channel, effectively destroying the concentration polarization layer, making it difficult for pollutants to deposit on the membrane surface, significantly reducing the clogging frequency. The controllable turbulence generated by the spiral involute convex flow channel reduces the fouling rate on the membrane surface and can extend the chemical cleaning cycle.

[0013] 2. This anti-clogging reverse osmosis membrane module and water treatment device features an optimized flow channel design that reduces system pressure drop, thereby reducing operating energy consumption. The enhanced turbulence also improves mass transfer efficiency, helping to maintain high membrane flux and desalination rate. The elastic support points prevent stress concentration damage to the membrane sheets, thus improving the overall lifespan of the membrane module.

[0014] 3. This anti-clogging reverse osmosis membrane module and water treatment device features a modular quick-installation structure that makes disassembly and replacement of membranes simple and quick. Active anti-clogging and optimized fluid conditions greatly reduce membrane fouling and wear, effectively extending the service life of the membrane module. Attached Figure Description

[0015] Figure 1 This is a perspective view of the anti-clogging reverse osmosis membrane module of this utility model; Figure 2 This is a partial cross-sectional view of the membrane shell of this utility model; Figure 3 This is a schematic diagram of the installation of the membrane bag and guide plate with the central water pipe of this utility model; Figure 4 This is an assembly drawing of the membrane bag and guide plate of this utility model; Figure 5 This is a three-dimensional view of the present utility model.

[0016] Legend: 1. Membrane housing; 2. Central permeate pipe; 3. Membrane bag; 31. Membrane sheet; 4. Flow guide plate; 41. Protrusion; 42. Groove; 43. Elastic support point; 44. Annular groove; 5. End cap; 51. Inlet; 6. Concentrate outlet. Detailed Implementation

[0017] A clog-resistant reverse osmosis membrane module and water treatment device, such as Figure 1 As shown, it includes a central permeate pipe 2 and a membrane housing 1 fitted on the outermost side. The membrane housing 1 is cylindrical and made of glass fiber reinforced plastic with a thickness of 14-20 mm. It has sufficient pressure resistance. The left end of the membrane housing 1 is detachably connected to the end cap 5 through a flange and a pressure-bearing tie rod (not shown in the figure). The end cap 5 is fixedly installed with an inlet 51. The end of the membrane housing 1 is provided with a concentrate outlet 6. The central permeate pipe 2 extends from the center of the membrane housing 1 as the permeate outlet.

[0018] like Figure 2 , Figure 3 and Figure 4 As shown, multiple membrane bags 3 are fitted around the central permeate pipe 2, and multiple guide plates 4 are stacked alternately with the membrane bags 3. Each guide plate 4 is disc-shaped, with spirally distributed involute protrusions 41 on its front side. The height of the protrusions 41 increases from the center to the edge of the guide plate 4. The cross-section of each protrusion 41 is semi-cylindrical, with a height ranging from 0.5 mm to 2.0 mm. The back of each guide plate 4 has a network that matches the protrusions on the front. When multiple guide plates 4 are stacked, the front... The protrusion 41 fits into the groove 42 on the back of the adjacent guide plate. The guide plate 4 is made of polyoxymethylene material, and its surface is embedded with elastic support points 43 made of NBR nitrile rubber. The edge of the guide plate 4 is provided with an annular groove 44 for installing O-ring seals. The membrane bag 3 is formed by placing two circular polyamide composite membrane sheets 31 back to back, with the active layers of the two membrane sheets 31 facing outwards, forming a water production channel in the middle, with sealed edges, and a hole in the center for the central water production pipe 2 to pass through.

[0019] This design allows the flow channel gap to gradually widen, which is conducive to the formation of stable turbulence. The back of the guide plate 4 is machined with a network of grooves 42 that match the array of protrusions 41 on the front. When multiple guide plates 4 are stacked, the protrusions 41 on the front of one guide plate 4 will be embedded in the grooves 42 on the back of the adjacent guide plate 4. This not only plays a positioning role, but more importantly, it forms a complex radial and tangential composite flow channel, which greatly enhances the turbulence of the fluid. The surface of the guide plate 4 is also embedded with several elastic support points 43 made of NBR nitrile rubber to buffer the pressure on the membrane bag 3 and prevent the membrane 31 from being damaged by the hard protrusions. The edge of the guide plate 4 has an annular groove for installing O-ring seals (not shown in the figure) to prevent the raw water from short-circuiting.

[0020] End cap 5 is the water inlet end, and water inlet 51 is used to connect to the pump that transports raw water.

[0021] like Figure 5 As shown, a water treatment device includes a water tank, on which all the aforementioned anti-clogging reverse osmosis membrane components are installed. A bracket is welded onto the water tank, and the membrane housing 1 can be locked and fixed to the bracket by bolts. This device includes the aforementioned anti-clogging reverse osmosis membrane components as its core treatment unit. This water treatment device can be applied to various scenarios such as landfill leachate treatment, industrial wastewater reuse, and high-salinity wastewater desalination.

[0022] The working principle of this utility model is as follows: After the raw water is treated by the pretreatment unit to remove large particulate suspended solids, it is pressurized to 60-80 bar by a high-pressure pump and enters the membrane module through the inlet 51. The high-pressure raw water enters through the inlet 51 and, after being guided, enters the flow channel formed between the guide plates 4. Under the guidance of the unique array of protrusions 41, the water flow generates strong turbulence, which continuously washes the surface of the membrane bag 3, effectively inhibiting the deposition of pollutants. Under pressure, water molecules pass through the membrane 31 into the product water flow channel, and flow into the central product water pipe 2 and are discharged. The concentrated wastewater carries the pollutants washed away by the turbulence and is discharged from the concentrate outlet 6. The central water pipe 2 is connected to the water tank and the purified water is sent into the water tank for storage.

[0023] The protrusions 41 on the front of the flow guide plate 4 are arranged with the center of the plate as the origin, following an involute trajectory with a base circle radius of 10mm, forming at least three independent spiral flow channels. The protrusions 41 are semi-cylinders with a bottom diameter of 2mm and a height that linearly increases from 0.5mm at the center of the plate to 2.0mm at the edge. The grooves 42 on the back of the flow guide plate 4 are slightly deeper than the height of the protrusions 41 to ensure that there are small gaps for fluid to pass through when stacked. The flow guide plate 4 is made of POM, and the NBR elastic support points 43 embedded on its surface have a Shore hardness of A70 and are 0.1-0.2mm higher than the top of the protrusions 41, which are used to preferentially contact and buffer the pressure on the membrane bag 3. An annular sealing gasket is nested in the central hole of the membrane bag 3. The central water production pipe 2 has multiple radial holes at the corresponding positions. When the membrane bag 3 and the guide plate 4 are pressed by the end cap 5, the sealing gasket is compressed and tightly fits the outer wall of the central water production pipe 2 to form a reliable seal, allowing only the pure water produced by the membrane bag 3 to flow into the central water production pipe 2 through the radial holes.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A clog-resistant reverse osmosis membrane module, characterized in that, It includes a central permeate pipe (2), multiple membrane bags (3) fitted outside the central permeate pipe (2), multiple guide plates (4) stacked alternately with the membrane bags (3), and a membrane shell (1) fitted on the outermost side. The guide plate (4) is disc-shaped and has spirally involute protrusions (41) distributed on its front side. The height of the protrusions (41) increases from the center of the guide plate (4) to the edge. One end of the membrane shell (1) is provided with an inlet (51) and the other end is provided with a concentrate outlet (6). One end of the central permeate pipe (2) extends out of the membrane shell (1) as a permeate outlet.

2. The anti-clogging reverse osmosis membrane module according to claim 1, characterized in that: The cross-section of the protrusion (41) is semi-cylindrical, and the height ranges from 0.5 mm to 2.0 mm.

3. The anti-clogging reverse osmosis membrane module according to claim 1, characterized in that: The back of the guide plate (4) is provided with a network that matches the front protrusion (41). When multiple guide plates (4) are stacked, the front protrusion (41) fits into the groove (42) on the back of the adjacent guide plate (4).

4. The anti-clogging reverse osmosis membrane module according to claim 1, characterized in that: The guide plate (4) is made of polyoxymethylene material, and its surface is embedded with elastic support points (43) made of NBR nitrile rubber.

5. The anti-clogging reverse osmosis membrane module according to claim 1, characterized in that: The edge of the guide plate (4) is provided with an annular groove (44) for installing O-ring seals.

6. The anti-clogging reverse osmosis membrane module according to claim 1, characterized in that: The membrane bag (3) is made of two circular polyamide composite membrane sheets (31) placed back to back, with the active layers of the two membrane sheets (31) facing outwards, forming a water production channel in the middle, with sealed edges and a hole in the center for the central water production pipe (2) to pass through.

7. A water treatment device, comprising a water tank, characterized in that: The water tank is equipped with an anti-clogging reverse osmosis membrane assembly as described in any one of claims 1-6.

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