Spiral-wound membrane assembly and water purification equipment with same

Abstract

The utility model provides a spiral-wound membrane assembly and water purification equipment with the spiral-wound membrane assembly, the spiral-wound membrane assembly comprises a water collecting pipe, a first membrane unit and a second membrane unit, the first membrane unit and the second membrane unit are wound on the water collecting pipe, the first membrane unit is provided with a first water inlet and a first flow channel which are communicated, and a waterproof membrane is arranged in the second membrane unit; the interior of the second membrane unit is divided into a second flow channel and a third flow channel by the waterproof membrane, the first flow channel is communicated with the second flow channel, the second flow channel is communicated with the third flow channel, and a first water outlet is formed in the tail end of the third flow channel. According to the scheme, the second membrane unit comprises two surfaces, raw water flows between the two surfaces along the direction perpendicular to the water collecting pipe, and the direction change does not exist in the flowing process, so that the flow rates of the surfaces of the membrane units are the same, and a low-flow-rate region basically does not exist, so that the service life of the RO under different recovery rates can be prolonged, the dead zone problem of the second membrane unit is effectively improved, and the service life of the RO is prolonged. And the concentration polarization degree is effectively reduced.

Description

Technical Field

[0001] The utility model belongs to the field of water purification equipment, and particularly relates to a spiral wound membrane module and a water purification device with the same. Background Art

[0002] At present, the raw water of the most widely used membrane element flows into from one end of the membrane unit, flows along the direction parallel to the central tube, the purified water enters the membrane bag, and the unpassed concentrated water flows out from the other end of the membrane unit. Since the flow channel is wide in this way, the flow velocity on the membrane surface is slow, and concentration polarization is formed on the membrane surface, resulting in an increase in the concentration of filtered impurities on the membrane surface, thus easily causing fouling. When the system recovery rate increases, the concentration polarization phenomenon on the membrane surface becomes more serious, and the service life of the membrane element will be shortened.

[0003] There is a disclosed membrane element, filter element and water purification device (patent application number: CN201811109670.1). This solution forms 3 single-side flow membrane units perpendicular to the central tube by caulking the end caps. These 3 units are connected in series continuously to increase the membrane flow velocity. However, this method also has disadvantages. On the premise of the same winding length, there are dead zones in the second and third single-side flow membrane units and the concentration polarization phenomenon is serious. Under high recovery rate conditions, these dead zones will have an obvious impact on the performance and service life of the RO module. Summary of the Utility Model

[0004] The present application provides a spiral wound membrane module and a water purification device with the same, aiming to solve the problems that there are dead zones and serious concentration polarization phenomenon during the use of the above-mentioned membrane element, and under high recovery rate conditions, these dead zones will have an obvious impact on the performance and service life of the RO module.

[0005] In order to achieve the above object, the utility model adopts the following technical solutions:

[0006] A spiral wound membrane module includes a collecting pipe, a first membrane unit and a second membrane unit. The first membrane unit and the second membrane unit are wound around the collecting pipe. The first membrane unit is provided with a first water inlet and a first flow channel which are communicated with each other. A water isolation membrane is arranged inside the second membrane unit. The water isolation membrane divides the inside of the second membrane unit into a second flow channel and a third flow channel. The first flow channel is communicated with the second flow channel, the second flow channel is communicated with the third flow channel, and a first water outlet is arranged at the end of the third flow channel.

[0007] Preferably, the length of the water isolation membrane winds around the spiral wound membrane module at least one circle. A waste water flow channel is arranged between the water isolation membrane on the outer side and the water isolation membrane on the inner side of the spiral wound membrane module, and the waste water flow channel is communicated with the first water outlet.

[0008] Preferably, the first flow channel, the second flow channel and the third flow channel are respectively provided with grids.

[0009] Preferably, the second membrane unit includes a first side and a second side. The upper and lower ends of the first side and the second side are respectively sealed with glue. The upper end of the first membrane unit is sealed with glue, and the lower end part of the first membrane unit is sealed with glue. The unsealed area at the lower end of the first membrane unit forms a first water inlet.

[0010] Preferably, the upper and lower ends of the first membrane unit are respectively sealed and connected to the upper and lower ends of the first side. The side of the first membrane unit away from the water collecting pipe is hermetically communicated with the side of the first side away from the water collecting pipe through a water isolation membrane. A clean water flow channel is provided between the first membrane unit and the second membrane unit. The water collecting pipe is provided with a plurality of water collecting holes, and the clean water flow channel is communicated with the water collecting holes.

[0011] Preferably, the ways of glue-sealing the lower ends of the first side and the second side respectively include glue-sealing on the front side inside the unit and glue-sealing on the end face of the unit.

[0012] Preferably, the distance between the glue-sealed area at the upper end of the first membrane unit and the second membrane unit and the water collecting pipe is 0% - 30% of the total length of the membrane unit.

[0013] Preferably, the length of the glue-sealed area at the lower end of the second membrane unit is the same as the length of the glue-sealed area at the lower end part of the first membrane unit, and the length of the glue-sealed area on the front side of the second membrane unit is not less than the length of the first water inlet.

[0014] Preferably, the grids in the second flow channel, the grids in the third flow channel and the water isolation membrane are of an integral structure, and the distance between the water isolation membrane and the crease of the second membrane unit is greater than the distance between the grids and the crease of the second membrane unit.

[0015] A water purification device includes the spiral wound membrane module described in any one of the above.

[0016] The utility model has the following beneficial effects:

[0017] In this solution, the second membrane unit includes two sides. The raw water flows between the two sides along the direction perpendicular to the water collecting pipe, and there is no change in direction during the flowing process. Therefore, the flow velocity on the surface of the membrane unit is the same, and there is basically no low-flow velocity area. Thus, the service life of RO under different recovery rates can be improved, the dead zone problem of the second membrane unit can be effectively improved, and the degree of concentration polarization can be effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the raw water flow channel in the unfolded state of the first membrane unit and the first side of the second membrane unit in the utility model;

[0019] Figure 2 It is a schematic diagram of the raw water flow channel in the unfolded state of the second side of the second membrane unit in the utility model;

[0020] Figure 3This is a schematic diagram of the raw water water flow direction in the unfolded state of the first membrane unit and the second membrane unit in the present utility model;

[0021] Figure 4 This is a schematic diagram of the water flow principle of a membrane module in the present utility model.

[0022] Figure 5 This is a schematic diagram of the water flow principle of another membrane module in the present utility model.

[0023] Among them, 1 - the first side, 11 - the fourth side edge of the first side, 111 - the second water inlet, 12 - the third side edge of the first side, 121 - the front adhesive line of the third side edge of the first side, 122 - the end adhesive line of the third side edge of the first side, 13 - the second side edge of the first side, 131 - the second water outlet, 14 - the first side edge of the first side, 141 - the end adhesive line of the first side edge of the first side, 2 - the first membrane unit, 21 - the fourth side edge of the first membrane unit, 211 - the third water outlet, 22 - the third side edge of the first membrane unit, 221 - the first water inlet, 222 - the end adhesive line of the third side edge of the first membrane unit, 23 - the first side edge of the first membrane unit, 231 - the end adhesive line of the first side edge of the first membrane unit, 3 - the second side, 31 - the fourth side edge of the second side, 311 - the first water outlet, 32 - the third side edge of the second side, 321 - the front adhesive line of the third side edge of the second side, 322 - the end adhesive line of the third side edge of the second side, 33 - the second side edge of the second side, 331 - the third water inlet, 34 - the first side edge of the second side, 341 - the end adhesive line of the first side edge of the second side, 4 - the water collecting pipe, 41 - the water collecting hole, 5 - the water isolation membrane, 6 - the grid, 7 - the first flow channel, 8 - the third flow channel, 9 - the second flow channel, 10 - the waste water flow channel, 11 - the first waste water outlet, 12 - the end cover sealing ring, 13 - the water collecting pipe sealing ring, 14 - the pure water outlet, 15 - the raw water inlet, 16 - the upper end cover, 17 - the lower end cover, 18 - the second waste water outlet. Detailed implementation manners

[0024] Example 1

[0025] As Figures 1-4 shown, a spiral wound membrane module includes a water collecting pipe 4, a first membrane unit 2 and a second membrane unit. The first membrane unit 2 and the second membrane unit are wound around the water collecting pipe 4. The first membrane unit 2 is provided with a first water inlet 221 and a first flow channel 7 that are connected. The second membrane unit is internally provided with a water isolation membrane 5. The water isolation membrane 5 divides the interior of the second membrane unit into a second flow channel 9 and a third flow channel 8. The first flow channel 7 is communicated with the second flow channel 9, the second flow channel 9 is communicated with the third flow channel 8, and a first water outlet 311 is provided at the end of the third flow channel 8.

[0026] Raw water enters from the first water inlet 221, and after being filtered by the first membrane unit 2 and the second membrane unit, the purified water flows out into the water collecting pipe 4. The wastewater flows through the first flow channel 7, the second flow channel 9, and the third flow channel 8, and then flows out from the first water outlet 311.

[0027] The length of the water isolation membrane 5 winds around the spiral wound membrane module at least one circle. A wastewater flow channel 10 is provided between the outer water isolation membrane 5 and the inner water isolation membrane 5 of the spiral wound membrane module, and the wastewater flow channel 10 is communicated with the first water outlet 311.

[0028] Grid nets 6 are respectively provided in the first flow channel 7, the second flow channel 9, and the third flow channel 8.

[0029] The second membrane unit includes a first side 1 and a second side 3. The upper and lower ends of the first side 1 and the second side 3 are respectively sealed with glue. The upper end of the first membrane unit 2 is sealed with glue, and the lower end part of the first membrane unit 2 is sealed with glue. The unsealed area at the lower end of the first membrane unit 2 forms the first water inlet 221.

[0030] The first side edge 14 of the first side and the first side edge 34 of the second side are sealed with glue, that is, the end parts of the first side edges of the two sides are sealed together. Similarly, the third side edges of the two sides are also sealed together, thereby forming an internal flow channel.

[0031] The upper and lower ends of the first membrane unit 2 are respectively sealed and connected to the upper and lower ends of the first side 1. One side edge of the first membrane unit 2 far from the water collecting pipe 4 is sealed and communicated with one side edge of the first side 1 far from the water collecting pipe 4 through the water isolation membrane 5. A purified water flow channel is provided between the first membrane unit 2 and the second membrane unit. The water collecting pipe 4 is provided with a plurality of water collecting holes 41, and the purified water flow channel is communicated with the water collecting holes 41.

[0032] One side edge of the first membrane unit 2 far from the water collecting pipe 4 is sealed and communicated with one side edge of the first side 1 far from the water collecting pipe 4, that is, the fourth side edge 21 of the first membrane unit is sealed and communicated with the fourth side edge 11 of the first side, so that the raw water in the first flow channel 7 can enter the second flow channel 9.

[0033] When sealing the end face, the end faces of the first side edge 23 of the first membrane unit, the first side edge 14 of the first side, and the first side edge 34 of the second side and the end cover are sealed with glue. The end faces of the third side edge 22 of the first membrane unit, the third side edge 12 of the first side, and the third side edge 32 of the second side and the end cover are sealed with glue. However, because the first water inlet 221 is opened on the third side edge 22 of the first membrane unit, a certain area needs to be left when sealing the end face with glue. However, the third side edge 12 of the first side and the third side edge 32 of the second side do not need to be provided with water inlets. Therefore, in order to seal the remaining area thereof, the method of sealing with glue on the front side is adopted.

[0034] The methods of sealing the lower ends of the first side 1 and the second side 3 with glue respectively include sealing with glue on the front side and sealing with glue on the end face.

[0035] The length of the region where the lower end of the second membrane unit is sealed with glue is the same as the length of the region where the lower end of the first membrane unit 2 is sealed with glue, and the length of the region where the front side of the second membrane unit is sealed with glue is not less than the length of the first water inlet 221.

[0036] The distance between the region where the upper ends of the first membrane unit 2 and the second membrane unit are sealed with glue and the water collecting pipe 4 is 0% - 30% of the total length of the membrane unit.

[0037] In this embodiment, the distance between the region where the upper ends of the first membrane unit 2 and the second membrane unit are sealed with glue and the water collecting pipe 4 is 0% of the total length of the membrane unit.

[0038] The second side edge 13 of the first side and the second side edge 33 of the second side are of an integral structure, and the two side edges overlap, which can also be said to be the same side edge, and it is the connection position of the first side 1 and the second side 3.

[0039] The grid 6 in the second flow channel 9, the grid 6 in the third flow channel 8 and the water isolation membrane 5 are of an integral structure, and the distance between the water isolation membrane 5 and the crease of the second membrane unit is greater than the distance between the grid 6 and the crease of the second membrane unit.

[0040] The working principle of this device:

[0041] Raw water enters from the raw water inlet 15 of the upper end cover 16 of the membrane module, and after passing through the first water inlet 221, the first membrane unit 2 and the second membrane unit for filtration treatment, the pure water in the raw water continuously penetrates from the first membrane unit 2 and the second membrane unit to the outside (i.e., continuously penetrates during the flow in the first flow channel 7, the second flow channel 9 and the third flow channel 8), is collected into the water collecting hole 41 through the clean water flow channel, then enters the water collecting pipe 4, and finally flows out from one end of the pure water outlet 14. The concentrated wastewater in the raw water passes through the first flow channel 7, the second flow channel 9, the third flow channel 8, the first water outlet 311 and the wastewater flow channel 10, and finally flows out from the first wastewater outlet 11 of the membrane module.

[0042] Embodiment 2

[0043] The difference between this embodiment and Embodiment 1 is that: the grid 6 in the second flow channel 9, the grid 6 in the third flow channel 8 and the water isolation membrane 5 are made of independent sheet materials.

[0044] Embodiment 3

[0045] The difference between this embodiment and Embodiment 1 is that: as Figure 5As shown in the figure, the distance between the region where the upper ends of the first membrane unit 2 and the second membrane unit are sealed with glue and the water collecting pipe 4 is 30% of the total length of the membrane unit. Raw water enters from the raw water inlet 15 of the upper end cover 16 of the membrane module, passes through the first water inlet 221, the first membrane unit 2 and the second membrane unit for filtration treatment. Part of the concentrated wastewater in the raw water passes through the first flow channel 7, the second flow channel 9, the third flow channel 8, the first water outlet 311 and the wastewater flow channel 10, and finally flows out from the first wastewater outlet 11 of the membrane module. Part of the wastewater flows out from the second wastewater outlet 18 of the lower end cover 17.

[0046] Embodiment 4

[0047] The difference between this embodiment and Embodiment 1 is that the number of the first membrane units 2 is two. The two first membrane units 2 and one second membrane unit are wound together. The two first membrane units 2 work simultaneously, and raw water enters at the same time, and then the raw water evenly flows into the second membrane unit and converges together, and continues to flow and filter in the second flow channel 9 and the third flow channel 8.

[0048] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.

Claims

1. A wound membrane assembly, comprising a water collecting pipe (4), a first membrane unit (2) and a second membrane unit, wherein the first membrane unit (2) and the second membrane unit are wound on the water collecting pipe (4), and the first membrane unit (2) is provided with a first water inlet (221) and a first flow channel (7) which are connected to each other, characterized in that: A water-isolating membrane (5) is provided inside the second membrane unit, and the water-isolating membrane (5) divides the inside of the second membrane unit into a second flow channel (9) and a third flow channel (8); the first flow channel (7) is connected to the second flow channel (9), and the second flow channel (9) is connected to the third flow channel (8); and a first water outlet (311) is provided at the end of the third flow channel (8).

2. A wound membrane assembly according to claim 1, characterized in that: The length of the water-blocking membrane (5) is at least enough to wrap around the rolled membrane assembly once, and a wastewater flow channel (10) is provided between the water-blocking membrane (5) on the outside of the rolled membrane assembly and the water-blocking membrane (5) on the inside, and the wastewater flow channel (10) is connected to the first water outlet (311).

3. A wound membrane assembly according to claim 1, characterized in that: The first flow channel (7), the second flow channel (9) and the third flow channel (8) are respectively provided with a grid (6).

4. A spiral wound membrane assembly according to claim 1, characterized in that: The second membrane unit comprises a first surface (1) and a second surface (3); the upper ends and lower ends of the first surface (1) and the second surface (3) are respectively sealed with glue; the upper end of the first membrane unit (2) is sealed with glue; the lower end portion of the first membrane unit (2) is partially sealed with glue; and the unsealed area at the lower end of the first membrane unit (2) forms a first water inlet (221).

5. A wound membrane assembly according to claim 4, characterized in that: The upper end and the lower end of the first membrane unit (2) are respectively sealedly connected to the upper end and the lower end of the first surface (1); a side edge of the first membrane unit (2) away from the water collecting pipe (4) is sealedly connected to a side edge of the first surface (1) away from the water collecting pipe (4) via a water-isolating membrane (5); a clean water flow channel is provided between the first membrane unit (2) and the second membrane unit; the water collecting pipe (4) is provided with a plurality of water collecting holes (41); and the clean water flow channel is connected to the water collecting holes (41).

6. A spiral wound membrane assembly according to claim 4, characterized in that: The glue sealing methods of the lower ends of the first surface (1) and the second surface (3) respectively include glue sealing on the front surface of the unit and glue sealing on the end surface of the unit.

7. A spiral wound membrane assembly according to claim 4, characterized in that: The distance between the glue-sealed area at the upper ends of the first membrane unit (2) and the second membrane unit and the water collecting pipe (4) is 0% to 30% of the total length of the membrane unit.

8. A spiral wound membrane assembly according to claim 6, characterized in that: The length of the glue-sealed area at the lower end of the second membrane unit is the same as the length of the glue-sealed area at the lower end of the first membrane unit (2), and the length of the glue-sealed area at the front of the second membrane unit is not less than the length of the first water inlet (221).

9. A spiral wound membrane assembly according to claim 3, characterized in that: The grid (6) in the second flow channel (9), the grid (6) in the third flow channel (8) and the water-isolating membrane (5) are an integrated structure, and the distance between the water-isolating membrane (5) and the fold of the second membrane unit is greater than the distance between the grid (6) and the fold of the second membrane unit.

10. A water purification device, characterized in that: The invention comprises a wound membrane module as described in any one of claims 1 to 9.

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