Reverse osmosis membrane supporting body and purification device

Abstract

The invention discloses a reverse osmosis membrane support body and a purification device, and relates to the technical field of backwashing, the reverse osmosis membrane support body comprises a first-stage filter, a second-stage filter, a third-stage filter, and reverse osmosis membrane devices in the first-stage filter, the second-stage filter and the third-stage filter; the water pressure drives the spiral-wound reverse osmosis membrane to generate micro-expansion, so that the spiral-wound reverse osmosis membrane is prevented from being limited by the plurality of supporting bodies; firstly, after gaps of the spiral-wound reverse osmosis membrane are expanded, the sectional area of a pure water flowing channel is increased, stronger scouring shearing force can be formed for dirt which is originally firmly attached, meanwhile, the situation that the dirt is blocked in the gaps due to the narrow channel is avoided, and the residual rate of pollutants is greatly reduced; and 2, the on-way resistance and the local resistance of the pure water in the spiral-wound reverse osmosis membrane runner are synchronously reduced, so that not only is the washing force of the pure water enhanced, but also the energy consumption in the backwashing process is reduced, and the energy-saving and efficient washing effect is realized.

Description

Technical Field

[0001] This invention relates to the field of backwashing technology, and more particularly to a reverse osmosis membrane support and purification device. Background Technology

[0002] The core function of water purification equipment is to filter wastewater, thereby realizing the recycling and reuse of water resources. Currently, mainstream water purification equipment generally adopts a three-stage purification process: the first two stages aim to remove large-diameter particulate matter from wastewater step by step, usually relying on the physical interception of filter screens; the third stage focuses on removing pollutants such as inorganic salts, heavy metal ions, organic matter, bacteria and viruses from wastewater, and the core technology is spiral wound reverse osmosis membrane separation process.

[0003] During long-term operation, a large amount of fouling gradually accumulates inside the device. This fouling reduces the wastewater purification effect. Currently, the industry mostly uses backwashing to remove the fouling accumulated inside the device. However, due to the narrow gaps in the flow channels of spiral wound reverse osmosis membranes, the frictional and local resistance of the water flow within the membrane element channels is relatively high during backwashing, resulting in insufficient flushing force and difficulty in effectively removing some pollutants. At the same time, the narrow flow channel gaps also hinder the discharge of fouling, causing pollutants to remain continuously in the membrane gaps, ultimately resulting in poor backwashing performance of spiral wound reverse osmosis membranes.

[0004] To address these issues, we designed a reverse osmosis membrane support and purification device. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the present invention provides a reverse osmosis membrane support and purification device, which adopts an improved scheme of slightly enlarging the flow channel gap of the spiral reverse osmosis membrane. On the one hand, it can reduce the resistance along the flow path and local resistance of the backwash water flow and improve the effective flux of the backwash water flow; on the other hand, it can avoid the fouling due to the limited flow channel space and achieve a reduction in the fouling residue rate of the spiral reverse osmosis membrane.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A reverse osmosis membrane support includes: multiple supports forming a tubular structure that wraps around a spiral-wound reverse osmosis membrane; and an adjustment group linked to the supports; the adjustment group consists of two telescopic chambers and two three-way pipes; each telescopic chamber is connected to a connecting pipe I and a fixed connecting pipe II, the connecting pipe II having a drain outlet; the two connecting pipes I and II are slidably connected to the two three-way pipes respectively, one of the three-way pipes being used to discharge wastewater, and the other three-way pipe being connected to a return pipe, the return pipe receiving pure water entering a single reverse osmosis membrane device; two sliding columns are fixed at both ends of each support; the sliding columns are nested in inclined sliding grooves, the multiple inclined sliding grooves being arranged in a ring along the axis of the spiral-wound reverse osmosis membrane, the inclined sliding grooves allowing slight movement of the support; steel ropes are connected to both ends of each support, the steel ropes being fixedly connected to the movable end of the telescopic chamber; wastewater flows along the two telescopic chambers and one of the three-way pipes towards the spiral-wound reverse osmosis membrane for filtration.

[0007] In one embodiment, a silicone layer is attached to the opposite surface of the support and the spiral reverse osmosis membrane, and the support is made of PVC material.

[0008] The present invention also aims to provide a purification device, comprising: a primary filter, a secondary filter, and a tertiary filter; the three are connected in series via multiple pipes; the pipes are switchable to allow the primary, secondary, and tertiary filters to be backwashed individually; the two reverse osmosis membrane devices within the tertiary filter include: a spiral wound reverse osmosis membrane, an upper chamber, and a lower chamber, with a three-way pipe connected to the upper chamber; a central tube is provided at the axis of the spiral wound reverse osmosis membrane; the upper and lower ends of the pipes are respectively connected to an inlet water pipe and a drain water pipe, and each connection point between the pipe and the inlet water pipe is equipped with an electric three-way valve, and each connection point between the pipe and the drain water pipe is equipped with an electric valve; the inlet water pipe passes through the interior of the central tube, and the drain water pipe is connected to the central tube; two one-way valves are provided on the drain water pipe connected to the two central tubes, and the inlet water pipe has openings in the pipe wall inside the two telescopic chambers.

[0009] In one embodiment, the primary filter includes: a tank and two filters disposed inside the tank; its specific structure is as follows: it includes a drain pipe, a tubular filter screen, an outer pipe, and a baffle; the tubular filter screen is coaxially disposed inside the outer pipe, the drain pipe is coaxially disposed inside the filter screen, and the wall of the drain pipe has several water inlets; a baffle is disposed below the filter screen, the baffle is in contact with the inner wall of the outer pipe, and the baffle is used to block several drain outlets opened at the lower end of the outer pipe; a spring is disposed on the bottom surface of the baffle.

[0010] In one embodiment, the primary filter and the secondary filter are connected as follows: the two branch pipes of the inlet water pipe at the upper end of the pipeline are respectively connected to the outer pipes of the two filters of the secondary filter, and the two branch pipes of the drain water pipe at the lower end of the pipeline are respectively connected to the drain pipes of the two filters of the primary filter.

[0011] In one embodiment, the secondary and tertiary filters are connected as follows: the two branch pipes of the inlet water pipe at the upper end of the pipeline are respectively connected to the two reverse osmosis membrane devices of the tertiary filter, and the two branch pipes of the drain water pipe at the lower end of the pipeline are respectively connected to the drain pipes of the two filters of the secondary filter.

[0012] In one embodiment, the tank of the three-stage filter is fixed to two sets of reverse osmosis membrane devices by means of multiple connecting columns.

[0013] In one embodiment, each end of the central tube is provided with an end support rod, and the two end support rods are respectively attached to the two end faces of the spiral reverse osmosis membrane.

[0014] In one embodiment, when backwashing the primary filter, secondary filter, and tertiary filter individually, the backwashing duration is precisely controlled by a time relay. Specifically, the time relay is electrically connected to a microcontroller, which centrally regulates the opening and closing states of multiple electric valves and multiple electric three-way valves according to preset parameters of the time relay.

[0015] In one embodiment, the primary filter, secondary filter, and tertiary filter are fixed to the ground by a frame.

[0016] The beneficial effects of this invention are as follows: (1) The present invention uses sewage pressure to push two telescopic cavities to extend, thereby pulling steel ropes to tighten them, which in turn pulls multiple supports to contract inward and fit tightly with the spiral reverse osmosis membrane. This avoids the problem that sewage pressure will cause the spiral reverse osmosis membrane to shake, resulting in loosening and gaps, which would reduce the sewage filtration effect.

[0017] (2) The present invention uses pure water pressure to push the two telescopic cavities to contract, thereby releasing the limiting effect of multiple supports on the spiral reverse osmosis membrane. The pure water pressure drives the spiral reverse osmosis membrane to expand slightly. This slight expansion can achieve two major effects: First, after the spiral reverse osmosis membrane gaps expand, the cross-sectional area of ​​the pure water flow channel increases, which can form a stronger flushing shear force on the originally firmly attached dirt, while avoiding dirt from being stuck in the gaps due to the narrow channel, thus greatly reducing the pollutant residue rate. Second, the frictional resistance and local resistance of pure water in the spiral reverse osmosis membrane flow channel decrease simultaneously, which not only enhances the flushing force of pure water, but also reduces the energy consumption in the backwashing process, achieving an energy-saving and efficient flushing effect. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram showing the connection of the primary filter, secondary filter, and tertiary filter of the present invention; Figure 3 This is a schematic diagram of the internal structure of the primary filter of the present invention; Figure 4 This is a schematic diagram of the internal structure of the three-stage filter of the present invention; Figure 5 This is a schematic diagram of the reverse osmosis membrane device of the present invention; Figure 6 This is a schematic diagram of the internal structure of the reverse osmosis membrane device of the present invention; Figure 7 This is a schematic diagram of the adjustment group structure of the present invention; Figure 8 This is a schematic diagram of the support structure of the present invention; Figure 9 This is a top view of the upper cavity of the present invention; Figure 10 This is a schematic diagram showing the connection between the support body and the adjustment assembly of the present invention; Figure 11 This is a schematic diagram of water flow during the filtration of raw water using the spiral wound reverse osmosis membrane of the present invention; Figure 12 This is a schematic diagram of water flow during backwashing of the spiral wound reverse osmosis membrane of the present invention.

[0019] In the diagram: 10, Primary filter; 20, Secondary filter; 30, Tertiary filter; 40, Pipeline; 50, Frame; 100, Sewage pipe; 101, Tank 1; 301, Tank 2; 302, Connecting column; 401, Drainage branch pipe; 402, Inlet water branch pipe; 403, Electric valve; 404, Electric three-way valve; 405, One-way valve; 406, Return pipe; 4021, Opening; 1, Filter; 11, Drainage pipe 12. Filter screen; 13. Outer tube; 131. Drain outlet; 14. Baffle; 15. Spring; 2. Spiral wound reverse osmosis membrane; 21. Central tube; 22. End support rod; 3. Upper chamber; 31. Inclined slide; 4. Lower chamber; 41. Concentrate outlet; 5. Adjustment group; 51. Telescopic chamber; 511. Connecting pipe one; 512. Connecting pipe two; 52. T-junction pipe; 6. Support body; 61. Assembly plate; 62. Sliding column; 63. Steel rope. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments of the present invention include, but are not limited to, the following embodiments.

[0021] Please see Figure 1-2This invention discloses a reverse osmosis membrane support and a water purification device using the support. The purification device adopts a three-stage filtration structure, including: a primary filter 10, a secondary filter 20, and a tertiary filter 30. The primary filter 10, secondary filter 20, and tertiary filter 30 are fixed by a frame 50 to be higher than the ground. The primary filter 10 and secondary filter 20 are responsible for the step-by-step interception and removal of large-diameter particles in wastewater, while the tertiary filter 30 is responsible for removing pollutants such as inorganic salts, heavy metal ions, organic matter, bacteria, and viruses from the wastewater. The primary filter 10, secondary filter 20, and tertiary filter 30 are connected in series by multiple pipes 40, and each filter is equipped with a sewage discharge pipe 100 at its lower end. Please see Figure 3 The primary filter 10 includes a tank 101 and two filters 1 disposed inside the tank 101. The filters 1 are used to intercept large-diameter particles in wastewater, and their specific structure is as follows: they include a drainage pipe 11, a tubular filter screen 12, an outer pipe 13, and a baffle 14. The tubular filter screen 12 is coaxially disposed inside the outer pipe 13, and the drainage pipe 11 is coaxially disposed inside the filter screen 12, with several inlets (not shown in the figure) opened on the pipe wall of the drainage pipe 11. A baffle 14 is disposed below the filter screen 12, and the baffle 14 is flush with the inner wall of the outer pipe 13. The baffle 14 is designed to fit snugly and slide up and down along the axial direction of the outer tube 13. It is used to block several drain outlets 131 at the lower end of the outer tube 13. It should be noted that the baffle 14 is not a filter screen 12 nested in the center, but rather an extension pipe extending upward from the bottom of the outer tube 13. A spring 15 is provided on the bottom surface of the baffle 14, which provides elastic support to the baffle 14. The structure of the secondary filter 20 is the same as that of the primary filter 10, and will not be described in detail here. The internal structure of the secondary filter 20 adopts the same name and numbering as the internal structure of the primary filter 10. Please see Figure 1-2 The specific connection method of the primary filter 10, secondary filter 20 and tertiary filter 30 is as follows: an inlet water pipe 402 is installed at the upper end of the pipe 40 at the input end, and the two branch pipes of the inlet water pipe 402 are respectively connected to the outer pipes 13 of the two filters 1 of the primary filter 10; a water pump is installed in series on the pipe 40 to provide power for the transportation of sewage in the system. The pipe 40 located in the middle section is used to connect the primary filter 10 and the secondary filter 20. The two branch pipes of the water inlet pipe 402 at the upper end of the pipe 40 are respectively connected to the outer pipes 13 of the two filters 1 of the secondary filter 20. The two branch pipes of the drainage pipe 401 at the lower end of the pipe 40 are respectively connected to the drainage pipes 11 of the two filters 1 of the primary filter 10. The two branch pipes of the drainage branch pipe 401 located at the lower end of the output pipe 40 are respectively connected to the drainage pipes 11 of the two filters 1 of the secondary filter 20. The two branch pipes of the inlet water pipe 402 at the upper end of the pipe 40 are respectively connected to the two reverse osmosis membrane devices of the tertiary filter 30. An electric three-way valve 404 is installed at the connection node between the pipe 40 and the inlet water pipe 402, and an electric valve 403 is installed at the connection node between the pipe 40 and the drain branch pipe 401. The wastewater filtration flow path is as follows: Wastewater enters the two filters 1 of the primary filter 10 through the inlet pipe 40 and the inlet water pipe 402 at the input end; the wastewater passes through the filter screen 12, and large-diameter particles are intercepted and filtered out. The filtered wastewater enters the drainage pipe 11 through several inlet openings on the wall of the drainage pipe 11; the wastewater that has completed the first filtration flows through the drainage branch pipe 401 and then through the middle section of the pipe 40, entering the secondary filter 20 in the same way as the primary filtration, and is discharged after completing the second filtration; the wastewater after the second filtration enters the two reverse osmosis membrane devices of the tertiary filter 30 through the inlet water pipe 402 on the output pipe 40, and completes the deep filtration; the final pure water is discharged through the drainage pipe 11 connected to the lower end of the two reverse osmosis membrane devices, and two oppositely arranged one-way valves 405 are installed on the drainage pipe 11; When performing backwashing on the primary filter 10, the operation and working principle are as follows: First, close the electric valve 403 connected to the drain branch pipe 401 below the primary filter 10, and simultaneously switch the electric three-way valve 404 at the connection node between the pipe 40 and the inlet pipe 402, so that the sewage flows into one filter 1 in one direction; the filtered water of this filter 1 flows into the interior of another filter 1 through the drain pipe 11 and the drain branch pipe 401, and the filter screen 12 of this filter 1 is backwashed using the sewage after the first filtration; during this process, the sewage after the first filtration gathers inside the outer pipe 13 of the filter 1 to be backwashed, which increases the pressure inside the outer pipe 13, thereby pushing the baffle 14 to slide downward and opening several drain ports 131 at the lower end of the outer pipe 13; the dirt stripped off by backwashing is discharged along the drain ports 131 and the sewage pipe 100; the same method is used when performing backwashing on the secondary filter 20. Please see Figure 4-6The tank 301 of the three-stage filter 30 is fixed to the two sets of reverse osmosis membrane devices by means of multiple connecting columns 302. The reverse osmosis membrane device consists of a spiral reverse osmosis membrane 2, an upper chamber 3, a lower chamber 4, an adjustment group 5, and a support body 6. The upper chamber 3 and the lower chamber 4 are respectively assembled at the upper and lower ends of the spiral reverse osmosis membrane 2, and the open surfaces of both face the spiral reverse osmosis membrane 2. The bottom surface of the lower chamber 4 is provided with a concentrate outlet 41. The central tube 21 at the axis of the spiral reverse osmosis membrane 2 extends to the outside of the upper chamber 3 and the lower chamber 4 at both ends, and several water inlets (not shown in the figure) are provided on the tube wall of the central tube 21. Each end of the central tube 21 is provided with an end support rod 22, and the two end support rods 22 are tightly fitted to the two end faces of the spiral reverse osmosis membrane 2, thereby limiting the vertical direction of the spiral reverse osmosis membrane 2. The water inlet pipe 402 extends through the top surface of the central pipe 21 into its interior. The regulating assembly 5 is built into the central pipe 21 and connected to the water inlet pipe 402. The drainage branch pipe 401 is connected to the bottom surface of the central pipe 21. Please see Figure 7 , Figure 11 The regulating group 5 consists of two telescopic cavities 51 and two three-way pipes 52. One end of each telescopic cavity 51 is fixed to a water inlet pipe 402, and the other end is nested and assembled on the water inlet pipe 402 to achieve the extension and compression of the telescopic cavity 51. The two telescopic cavities 51 are arranged opposite to each other. The water inlet pipe 402 has openings 4021 on the pipe wall inside the two telescopic cavities 51 respectively. The opposite surfaces of the two telescopic cavities 51 are respectively provided with a first connecting pipe 511 and a second connecting pipe 512. The first connecting pipe 511 is connected to the telescopic cavity 51, and the second connecting pipe 512 has several drainage outlets near its connection with the telescopic cavity 51. The two first connecting pipes 511 and the two second connecting pipes 512 are slidably connected to the two three-way pipes 52 respectively. One of the three-way pipes 52 is connected to the upper cavity 3, and the other three-way pipe is connected to the upper cavity 3. Pipe 52 is connected to a return pipe 406, the other end of which is connected to a drainage branch pipe 401. The flow path of the wastewater after secondary filtration is as follows: the wastewater enters the two telescopic chambers 51 through the two openings 4021 of the inlet pipe 402, and the two telescopic chambers 51 are extended by the pressure of the wastewater itself. At this time, the three-way pipe 52 blocks the drainage outlet of the connecting pipe 2 512. Then the wastewater flows into the upper chamber 3 through the two connecting pipes 1 511 and the three-way pipe 52, and then enters the spiral reverse osmosis membrane 2 for filtration. The pure water produced after filtration enters the central pipe 21 along the spiral channel of the spiral reverse osmosis membrane 2, and is finally discharged through the drainage branch pipe 401. The concentrated water intercepted by the spiral reverse osmosis membrane 2 flows downward along the spiral reverse osmosis membrane 2, gathers in the lower chamber 4, and is then discharged through the concentrated water outlet 41 and the sewage pipe 100. Please see Figure 8-10The support body 6 comprises multiple supports forming a tubular structure that wraps around the spiral reverse osmosis membrane 2, thereby limiting the horizontal movement of the spiral reverse osmosis membrane 2. One support body 6 is fixedly connected to the outer end of the spiral reverse osmosis membrane 2, while the corresponding inner end of the spiral reverse osmosis membrane 2 is fixedly connected to the central tube 21. Assembly plates 61 are provided at both ends of the support body 6, and two sliding columns 62 are fixed on the assembly plates 61. The edges of the upper cavity 3 and the lower cavity 4 extend outwards, and multiple inclined sliding grooves 31 are formed at their extended portions. The inclined sliding grooves 31 are arranged in pairs in a ring along the axis of the upper cavity 3. The sliding columns 62 on the support body 6 are inserted into the corresponding inclined sliding grooves 31, allowing the support body 6 to move along the inclined sliding grooves 31. A slight sliding motion is achieved, thereby enabling the radial contraction or expansion of multiple support bodies 6. Steel ropes 63 are connected to the assembly plates 61 at both ends of the support bodies 6. Two steel ropes 63 pass through the interior of the central tube 21 and are fixedly connected to the movable ends of the two telescopic chambers 51, respectively. When the sewage pressure pushes the two telescopic chambers 51 to extend, the steel ropes 63 can be pulled to tighten them, thereby pulling the multiple support bodies 6 inward to contract and fit tightly against the spiral-wound reverse osmosis membrane 2. The initial sewage pressure flowing into the two telescopic chambers 51 is greater than the sewage pressure entering the spiral-wound reverse osmosis membrane 2. Therefore, the sewage pressure inside the spiral-wound reverse osmosis membrane 2 will not cause the membrane to expand outward, thus ensuring that the channel gap size inside the spiral-wound reverse osmosis membrane 2 remains stable when filtering sewage.

[0022] Preferably, in one embodiment, a silicone layer is attached to the opposite surface of the support 6 and the spiral reverse osmosis membrane 2 to prevent the hard surface of the support 6 from directly contacting the spiral reverse osmosis membrane 2 and causing scratch damage.

[0023] Preferably, in one embodiment, the support 6 is made of PVC material, so that the support 6 has the advantages of being lightweight and corrosion resistant.

[0024] Preferably, in one embodiment, when performing individual backwashing operations on the primary filter 10, secondary filter 20, and tertiary filter 30, the backwashing duration is precisely controlled by a time relay; specifically, the time relay is electrically connected to a microcontroller, and the microcontroller centrally regulates the opening and closing states of the multiple electric valves 403 and the multiple electric three-way valves 404 according to the preset parameters of the time relay.

[0025] Working principle of this invention: Please see Figure 12When performing backwashing on the spiral wound reverse osmosis membrane 2, first close the electric valve 403 on the drain branch pipe 401 below the tertiary filter 30, and simultaneously switch the electric three-way valve 404 at the connection point between pipe 40 and the inlet water pipe 402, so that the sewage flows into one set of reverse osmosis membrane devices in one direction, that is, the original two water flows converge into one, thereby increasing the water pressure; the pure water filtered by this device flows out along the drain branch pipe 401, and after being blocked by the one-way valve 405, it flows into the return pipe 406, and then is introduced into the regulating group 5 of another set of reverse osmosis membrane devices through the return pipe 406. The specific process is as follows: Pure water enters the connecting pipe 512 through the three-way pipe 52. The pressure of the pure water forces the two telescopic cavities 51 to contract, opening several drain outlets on the connecting pipe 512 and slackening the steel rope 63. Subsequently, the pure water flows into the spiral reverse osmosis membrane 2 through the drain outlets and the central pipe 21 of the connecting pipe 512. Due to the slack in the steel rope 63, the multiple supports 6 release their restraining effect on the spiral reverse osmosis membrane 2, and the pure water pressure drives the membrane to expand slightly. This slight expansion achieves two main effects: First, after the expansion of the spiral reverse osmosis membrane 2, the cross-sectional area of ​​the pure water flow channel increases, generating a stronger scouring and shearing force on the originally firmly attached dirt, while preventing dirt from getting stuck in the narrow gaps, significantly reducing the pollutant residue rate. Second, the frictional resistance and local resistance of the pure water in the flow channel of the spiral reverse osmosis membrane 2 decrease simultaneously, enhancing the scouring force of the pure water and reducing energy consumption during backwashing, achieving an energy-efficient and high-performance scouring effect.

[0026] The fouling removed by backwashing flows downwards along the spiral reverse osmosis membrane 2, collects in the lower chamber 4, and is then discharged through the concentrate outlet 41 and the sewage pipe 100. After the backwashing operation is completed, the electric valve 403 opens, the electric three-way valve 404 returns to its original water circuit state, the sewage pressure pushes the two telescopic chambers 51 to extend and pulls the steel rope 63 to tighten it, which in turn pulls the multiple supports 6 to retract inwards, causing the spiral reverse osmosis membrane 2 to return to its initial state.

Claims

1. A reverse osmosis membrane support; characterized in that: It includes multiple supports (6), which together form a tubular structure to wrap the spiral reverse osmosis membrane (2); And an adjustment group (5) linked to multiple supports (6); the adjustment group (5) consists of two telescopic cavities (51) and two three-way pipes (52); the telescopic cavity (51) is connected to a connecting pipe one (511) and a connecting pipe two (512) is fixed thereon, and the connecting pipe two (512) has a drain outlet; the two connecting pipes one (511) and the two connecting pipes two (512) are respectively slidably connected to the two three-way pipes (52), one of the three-way pipes (52) is used to discharge sewage, and the other three-way pipe (52) is connected to the return pipe (406) for discharge. The flow tube (406) receives pure water into a single reverse osmosis membrane device; two sliding columns (62) are fixed at both ends of the support body (6); the sliding columns (62) are nested into the inclined sliding groove (31), and multiple inclined sliding grooves (31) are arranged in a ring along the axis of the spiral reverse osmosis membrane (2). The inclined sliding grooves (31) allow the support body (6) to move slightly. Steel ropes (63) are connected to both ends of the support body (6), and the steel ropes (63) are fixedly connected to the movable end of the telescopic cavity (51); the sewage flows along the two telescopic cavities (51) and one of the three-way pipes (52) to the spiral reverse osmosis membrane (2) for filtration.

2. A reverse osmosis membrane support according to claim 1; characterized in that: The support (6) and the spiral reverse osmosis membrane (2) are attached with a silicone layer, and the support (6) is made of PVC material.

3. A purification device, characterized in that: The reverse osmosis membrane support as described in claim 1 further includes: a primary filter (10), a secondary filter (20), and a tertiary filter (30); the three are connected in series via multiple pipes (40), characterized in that: the pipes (40) can switch water paths, allowing the primary filter (10), secondary filter (20), and tertiary filter (30) to be backwashed individually; the two reverse osmosis membrane devices in the tertiary filter (30) include: a spiral wound reverse osmosis membrane (2), an upper chamber (3), and a lower chamber (4), and a three-way pipe (52) is connected to the upper chamber (3); a central tube (21) is provided at the axis of the spiral wound reverse osmosis membrane (2); the pipes (40) The upper and lower ends of the pipe (40) are respectively connected to the water inlet pipe (402) and the drainage pipe (401). An electric three-way valve (404) is provided at the connection node between the pipe (40) and the water inlet pipe (402), and an electric valve (403) is provided at the connection node between the pipe (40) and the drainage pipe (401). The water inlet pipe (402) passes through the interior of the central pipe (21), and the drainage pipe (401) is connected to the central pipe (21). Two one-way valves (405) are provided on the drainage pipe (401) connected to the two central pipes (21). The water inlet pipe (402) has an opening (4021) in the pipe wall inside the two telescopic cavities (51).

4. The purification device according to claim 3, characterized in that: The primary filter (10) includes a tank (101) and two filters (1) arranged inside the tank (101). Its specific structure is as follows: it includes a drain pipe (11), a tubular filter screen (12), an outer pipe (13), and a baffle (14). The tubular filter screen (12) is coaxially arranged inside the outer pipe (13), and the drain pipe (11) is coaxially arranged inside the filter screen (12). Several water inlets are opened on the pipe wall of the drain pipe (11). A baffle (14) is arranged below the filter screen (12). The baffle (14) is in contact with the inner wall of the outer pipe (13). The baffle (14) is used to block several drain outlets (131) opened at the lower end of the outer pipe (13). A spring (15) is arranged on the bottom surface of the baffle (14).

5. The purification device according to claim 4, characterized in that: The connection method of the primary filter (10) and the secondary filter (20) is as follows: the two branch pipes of the water inlet pipe (402) at the upper end of the pipe (40) are connected to the outer pipes (13) of the two filters (1) of the secondary filter (20) respectively, and the two branch pipes of the drainage branch pipe (401) at the lower end of the pipe (40) are connected to the drainage pipes (11) of the two filters (1) of the primary filter (10) respectively.

6. The purification device according to claim 4, characterized in that: The connection method of the secondary filter (20) and the tertiary filter (30) is as follows: the two branches of the water inlet pipe (402) at the upper end of the pipe (40) are connected to the two reverse osmosis membrane devices of the tertiary filter (30) respectively, and the two branches of the drainage branch pipe (401) at the lower end of the pipe (40) are connected to the drainage pipes (11) of the two filters (1) of the secondary filter (20) respectively.

7. The purification device according to claim 3, characterized in that: The tank 2 (301) of the three-stage filter (30) is fixed to the two reverse osmosis membrane devices by means of multiple connecting columns (302).

8. The purification device according to claim 3, characterized in that: The central tube (21) is provided with end support rods (22) at both ends, and the two end support rods (22) are respectively attached to the two end faces of the spiral reverse osmosis membrane (2).

9. A purification device according to claim 3, characterized in that: When backwashing the primary filter (10), secondary filter (20), and tertiary filter (30) separately, the backwashing duration is precisely controlled by a time relay. Specifically, the time relay is electrically connected to a microcontroller, and the microcontroller centrally controls the opening and closing states of multiple electric valves (403) and multiple electric three-way valves (404) according to the preset parameters of the time relay.

10. A purification device according to claim 3, characterized in that: The primary filter (10), secondary filter (20), and tertiary filter (30) are fixed by a frame (50) and are above the ground.

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