Polyolefin substrate reverse osmosis membrane element

Abstract

The utility model relates to a polyolefin substrate reverse osmosis membrane element which comprises a central pipe, a reverse osmosis membrane group and a water collecting unit, the central pipe is a hollow pipe, the reverse osmosis membrane group comprises at least one water collecting membrane bag, and the water collecting membrane bag is formed by a first polyolefin reverse osmosis membrane and a second polyolefin reverse osmosis membrane which are in contact and sealed at four sides. One side edge of the water collecting film bag is parallel to the central pipe and is wound on the pipe wall of the central pipe; the water collecting unit comprises a plurality of water collecting pipelines and a pure water collecting pipe, the water collecting pipelines penetrate through a sealing side edge, adjacent to the parallel edge of the central pipe, of the water collecting film bag, one end of the pure water collecting pipe is connected with the water collecting pipelines, and the other end of the pure water collecting pipe is connected with the central pipe. By optimizing the pure water collecting path, the resistance in the flowing process of pure water is effectively reduced, so that the flowing speed of the pure water is obviously increased. The improvement not only increases the flux of the membrane element, but also enhances the anti-pollution performance of the membrane element.

Description

Technical Field

[0001] The utility model relates to the technical field of water purification treatment, in particular to a polyolefin-based reverse osmosis membrane element. Background Art

[0002] Pure water plays a crucial role in modern industrial production and scientific research, ensuring the quality and safety of the final products. For example, high-purity water is required for reagents, sample diluents, etc. used in laboratories to avoid interference with experimental results; in hospitals and clinics, pure water is used for drug preparation, cleaning equipment and surgical instruments, etc. to prevent infections; in the chip manufacturing process, extremely small impurities may cause defects, so extremely high-purity water is needed to clean and process semiconductor materials; meanwhile, in the pharmaceutical industry, the water content in drug preparations is crucial for the stability of drugs, so pure water is needed to ensure the quality and safety of drugs. Currently, there are various methods for preparing pure water, including technologies such as distillation, reverse osmosis, ion exchange, and electrodialysis. Among them, the reverse osmosis method is one of the most commonly used methods, especially in situations where a large amount of high-purity water needs to be produced.

[0003] Currently, common reverse osmosis membrane elements include a central tube and multiple reverse osmosis membrane bags. A number of rows of water inlets corresponding to each membrane bag are provided on the side of the central tube. A partition is provided near one end inside the central tube. Except for the side in contact with the central tube, the other three sides of the membrane bag are sealed. Raw water enters the reverse osmosis membrane element between the membrane bags. Through reverse osmosis, the raw water enters the membrane bag, and pure water is formed inside the membrane bag. The obtained pure water enters the central tube through the water inlets and then flows out from one end of the central tube.

[0004] However, when using such reverse osmosis membrane elements for water purification, it is found that the working efficiency and water production of the reverse osmosis membrane element are relatively low, and the membrane fouling is relatively serious. Summary of the Utility Model

[0005] Based on this, the purpose of the present utility model is to overcome the defects or deficiencies of the prior art and provide a polyolefin-based reverse osmosis membrane element.

[0006] A polyolefin-based reverse osmosis membrane element includes a central tube, a reverse osmosis membrane group, and a water collection unit. The central tube is a hollow tube. The reverse osmosis membrane group includes at least one water collection membrane bag, which is formed by sealing the four sides of a first polyolefin reverse osmosis membrane and a second polyolefin reverse osmosis membrane in contact. One side edge of the water collection membrane bag is parallel to the central tube and is wound around the tube wall of the central tube. The water collection unit includes a number of water collection pipes and a pure water collection pipe. The water collection pipes penetrate through a sealed side adjacent to the parallel side of the water collection membrane bag and the central tube. One end of the pure water collection pipe is connected to the water collection pipe, and the other end of the pure water collection pipe is connected to the central tube.

[0007] Compared with the prior art, the polyolefin-based reverse osmosis membrane element of the present utility model effectively reduces the resistance during the flow of pure water by optimizing the flow path of the collected pure water, thereby significantly increasing the pure water flow rate. In addition, the change in the flow path of the pure water also avoids the secondary pollution of the pure water. This improvement not only increases the flux of the membrane element but also enhances its anti-pollution performance.

[0008] Furthermore, the water collection pipes are a number of trapezoidal flat hollow pipes, and the water collection pipes are arranged at equal intervals inside a sealed side of the water collection membrane bag for collecting the pure water in the water collection membrane bag. The multiple water collection pipes achieve simultaneous water collection at multiple positions, making the pure water flow more uniform, increasing the water production and reducing the resistance of the pure water flow.

[0009] Furthermore, the pure water collection pipes are a number of through pipes. One end of each pure water collection pipe is independently connected to the water collection pipe, and the other end of the pure water collection pipe is connected to the central pipe, so that the pure water in the water collection membrane bag sequentially passes through the water collection pipe and the pure water collection pipe and converges at the central pipe. Further, it also includes a wire harness fixer, which is arranged at one end of the central pipe and fixes the pure water collection pipe.

[0010] In addition, the pure water collection pipe can also be a hollow pipe with a number of holes on its side wall. The multiple water collection pipes are connected to the pure water collection pipe through the holes. One end of the pure water collection pipe is closed or serves as one of the holes to be connected to the water collection pipe, and the other end of the pure water collection pipe is directly connected to the central pipe.

[0011] Furthermore, it also includes central pipe sealing rings, which are arranged at both ends of the central pipe to seal the central pipe and ensure the purity of the generated pure water.

[0012] Furthermore, the multiple water collection membrane bags are arranged at equal intervals along the circumference of the central pipe and are orderly wound around the central pipe in the same clockwise direction.

[0013] Furthermore, it also includes a concentrated water spacer. When multiple water collection membrane bags are wound around the central pipe, the concentrated water spacer is arranged between the multiple water collection membrane bags. The concentrated water spacer can serve as both the raw water flow channel and the concentrated water flow channel after the reverse osmosis reaction, which is used to promote the flow of the raw water and the concentrated water, reduce the pollution of the reverse osmosis membrane surface, and thus increase the membrane flux.

[0014] Furthermore, a pure water spacer is also arranged in the water collection membrane bag, which serves as a pure water flow channel to promote the flow of pure water in the water collection membrane bag.

[0015] For better understanding and implementation, the present utility model will be described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. 1 is a schematic structural view of the reverse osmosis membrane element provided in Embodiment 1 of the present utility model;

[0017] Figure 2 FIG. 2 is a schematic structural view of a plurality of water collection membrane bags provided in Embodiment 1 of the present utility model;

[0018] Figure 3 FIG. 3 is a schematic structural view of the reverse osmosis membrane element provided in Embodiment 2 of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In the prior art, the pure water in the water collection membrane bag needs to be collected into a central pipe through several holes in the central pipe wall, and the direction of the pure water flow channel is perpendicular to the axial direction of the central pipe, resulting in a large flow resistance and slow flow rate of the pure water flowing from the side of the water collection membrane bag far from the central pipe to the central pipe. In addition, due to the untimely conveyance of the pure water, the pure water will accumulate in the reverse osmosis membrane bag, causing an increase in the pressure in the water collection membrane bag, and further leading to problems such as a reduction in water production, a decrease in the utilization rate of the membrane sheet, and membrane fouling. At the same time, the existing pure water flow channel design may also cause secondary pollution of the pure water.

[0020] To solve the above problems, the present utility model proposes a polyolefin-based reverse osmosis membrane element. By arranging a water collection unit between the water collection membrane bag and the central pipe, the pure water in the water collection membrane bag is quickly flowed into the central pipe after being shunted by the water collection unit, optimizing the pure water collection path, reducing the pure water flow resistance, increasing the pure water flow rate, thus effectively solving the problem of the increase in the pressure in the membrane bag, improving the water production and the utilization rate of the membrane sheet, and reducing the possibility of membrane fouling. In addition, the improved design also avoids the problem of secondary pollution of the pure water.

[0021] The solution of the present utility model will be described in detail below with reference to the accompanying drawings.

[0022] Example 1

[0023] As Figures 1 to 2 shown, Embodiment 1 includes a central pipe 10, a reverse osmosis membrane group 20, a water collection pipe 30, and a pure water collection pipe 40. Among them, the water collection pipe 30 and the pure water collection pipe 40 form a water collection unit. The reverse osmosis membrane group 20 is wound around the central pipe 10. The water collection pipe 30 is arranged in the reverse osmosis membrane group 20 and penetrates the reverse osmosis membrane group 20 to be connected to one end of the pure water collection pipe 40. The other end of the pure water collection pipe 40 is connected to the central pipe 10. The pure water generated in the reverse osmosis membrane group 20 sequentially passes through the water collection pipe 30 and the pure water collection pipe 40 and flows into the central pipe 10.

[0024] Specifically, the central tube 10 is a hollow cylindrical tube, the tube wall of which is complete and has no holes; further, it also includes sealing rings 70 arranged at two ends of the central tube to seal the central tube to ensure the purity of the generated pure water.

[0025] The reverse osmosis membrane group 20 includes at least one water-collecting membrane bag, and the water-collecting membrane bag is formed by the first polyolefin reverse osmosis membrane 21 and the second polyolefin reverse osmosis membrane 22 contacting and sealing on four sides. One side of the water-collecting membrane bag is parallel to the long axis direction of the central tube 10 and can be wound around the central tube 10, and one of the adjacent sides adjacent to the side is provided with a plurality of side holes 23, and the plurality of side holes 23 are arranged at equal intervals. A pure water partition net 24 is also provided in the water-collecting membrane bag, which is used as a pure water flow channel to promote the flow of pure water in the water-collecting membrane bag. Specifically, when the reverse osmosis membrane group 20 includes a plurality of water-collecting membrane bags, each water-collecting membrane bag is arranged at equal intervals along the circumference of the central tube, and is orderly wound around the central tube along the same clock direction.

[0026] The water collecting pipes 30 are a number of trapezoidal flat hollow pipes, the number of which is the same as the side holes 23 on the side of the water collecting membrane bag. The water collecting pipes are arranged in the side holes 23, one end of which collects pure water and the other end of which discharges pure water, so as to collect the pure water in the water collecting membrane bag.

[0027] The pure water collecting pipe 40 includes a plurality of through pipes, one end of each through pipe is separately connected to each water collecting pipe of the water collecting pipe 30, and the other end is connected to the central pipe 10, so that the pure water obtained through the reverse osmosis membrane passes through the water collecting pipe 30 and the pure water collecting pipe 40 in sequence and is collected in the central pipe 10. Furthermore, a harness fixture 60 is also included, which is arranged at one end of the central pipe 10 and on the same side as the water collecting pipe 30 and the pure water collecting pipe 40, and is used to fix the plurality of through pipes, and can compress the volume of the membrane element.

[0028] Specifically, it also includes a concentrate water separator 50. When a plurality of the water-collecting membrane bags are arranged around the central tube 10, a concentrate water separator 50 is arranged between the plurality of the water-collecting membrane bags. The concentrate water separator 50 can be used as a flow channel for raw water as well as a flow channel for concentrate after reverse osmosis reaction, so as to promote the flow of raw water and concentrate water, reduce the pollution of the reverse osmosis membrane surface, and thus increase the membrane flux.

[0029] The external raw water first flows through the concentrated water separation net 50 serving as the raw water flow channel. Due to the characteristics of the first polyolefin reverse osmosis membrane 21 or the second polyolefin reverse osmosis membrane 22, water molecules in the raw water can effectively pass through the membrane, while other impurities are intercepted. The water passing through the membrane enters the water collection membrane bag. At this time, the water collection membrane bag is filled with pure water of relatively high purity, and the intercepted impurities and the remaining water, i.e., the concentrated water, are discharged through the concentrated water separation net 50. The pure water in the obtained water collection membrane bag then flows through the water collection pipe 30 and enters the central pipe 10 through the connected pure water collection pipe 40, realizing the collection of pure water.

[0030] By improving the flow path of the collected pure water, the present utility model realizes the simultaneous collection of pure water at multiple positions, which not only improves the efficiency of pure water collection, alleviates the phenomenon of increased pressure in the water collection membrane bag caused by the excessive accumulation of pure water in the bag, but also reduces the flow resistance of pure water, and improves the water production capacity, membrane utilization rate, and membrane anti-pollution property of the reverse osmosis membrane element.

[0031] Example 2

[0032] As Figure 3 shown, the structure of a polyolefin-based reverse osmosis membrane element in Embodiment 2 of the present utility model is substantially the same as that in Embodiment 1, and the difference lies only in that:

[0033] The pure water collection pipe 40 is a main pipe 41 with a plurality of holes 42 provided on its side wall. The water collection pipe 30 is directly connected to the pure water collection pipe 40. The number of the water collection pipes 30 is the same as the number of the holes 42. One end of the pure water collection pipe 40 is closed or serves as one of the holes 42 to be connected to the water collection pipe 30, and the other end of the pure water collection pipe 40 is directly connected to the central pipe 10, realizing the transportation of pure water from the water collection membrane bag to the central pipe 10.

[0034] In Embodiment 2 of the present utility model, the pure water collection pipe 40 uses a main pipe to replace the multiple branch pipes in Embodiment 1. While having the same improvement effect as Embodiment 1, it also compresses the placement space of the pure water collection pipe in the polyolefin-based reverse osmosis membrane element, compresses the volume of the membrane element, and reduces the total mass.

[0035] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present application. The singular forms "a", "the" and "said" used in the embodiments of the present application and the claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that unless otherwise stated, "a number of" means two or more; the terms "first", "second", etc. are only used for distinction and not for describing a specific order or sequence, nor can they be understood as indicating or implying relative importance. When the above description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. In the description of the present application, those of ordinary skill in the art can understand the specific meanings of the above terms in the present application according to specific circumstances.

[0036] The above embodiments only express several implementation manners of the utility model, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the utility model.

Claims

1. A polyolefin-based reverse osmosis membrane element, characterized in that: It includes a central tube, a reverse osmosis membrane group and a water collection unit. The central tube is a hollow tube; The reverse osmosis membrane group includes at least one water-collecting membrane bag, which is formed by four-side contact and sealing of a first polyolefin reverse osmosis membrane and a second polyolefin reverse osmosis membrane, and one side of the water-collecting membrane bag is parallel to the central tube and is rolled around the tube wall of the central tube; The water collection unit includes a plurality of water collection pipes and a pure water collection pipe. The water collection pipe runs through a sealed side edge adjacent to the water collection membrane bag and the parallel side of the central pipe. One end of the pure water collection pipe is connected to the water collection pipe, and the other end of the pure water collection pipe is connected to the central pipe.

2. The polyolefin-based reverse osmosis membrane element according to claim 1, characterized in that: The water collecting pipe is a trapezoidal flat hollow pipe.

3. The polyolefin-based reverse osmosis membrane element according to claim 1 or 2, characterized in that: The plurality of water collecting pipes are arranged at equal intervals in a sealed side edge of the water collecting membrane bag.

4. The polyolefin-based reverse osmosis membrane element according to claim 3, characterized in that: The pure water collecting pipes are a plurality of through pipes, one end of each through pipe is connected to each of the water collecting pipes separately, and the other end is connected to the central pipe.

5. The polyolefin-based reverse osmosis membrane element according to claim 4, characterized in that: It also includes a wire harness fixer, which is arranged at one end of the central tube and fixes the plurality of through tubes.

6. The polyolefin-based reverse osmosis membrane element according to claim 3, characterized in that: The pure water collecting pipe is a hollow pipe with a plurality of holes, and the water collecting pipe is connected to the pure water collecting pipe through the holes. One end of the pure water collecting pipe is closed or connected to the water collecting pipe as one of the holes, and the other end of the pure water collecting pipe is directly connected to the central pipe.

7. The polyolefin-based reverse osmosis membrane element according to any one of claims 1, 2, 4, 5, and 6, characterized in that: It also includes a central tube sealing ring, which is arranged at two ends of the central tube.

8. The polyolefin-based reverse osmosis membrane element according to claim 7, characterized in that: The reverse osmosis membrane group comprises a plurality of water-collecting membrane bags, each of which is arranged at equal intervals along the circumference of the central tube and is arranged around the central tube in an orderly manner along the same clock direction.

9. The polyolefin-based reverse osmosis membrane element according to claim 8, characterized in that: It also includes a concentrated water separator, which is stacked between a plurality of the water-collecting membrane bags and is wound around the central tube along with the water-collecting membrane bags.

10. The polyolefin-based reverse osmosis membrane element according to claim 1, characterized in that: A pure water separator is also arranged in the water collecting membrane bag.

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