A hollow fiber membrane reverse osmosis filter cartridge assembly

Abstract

The utility model provides a kind of hollow fiber membrane reverse osmosis filter element assembly, including filter element packaging upper shell, radial shunt branch pipe and center water distribution main pipe, filter element packaging upper shell lower end is fixed with filter element packaging lower shell, filter element packaging upper shell and filter element packaging lower shell inside intermediate longitudinal installation has center water distribution main pipe, center water distribution main pipe side surface is evenly communicated with multiple radial shunt branch pipes and is installed in radial shape, multiple radial shunt branch pipes other end are evenly installed with conical flow cover, filter element packaging upper shell and filter element packaging lower shell inside are embedded with elastic packaging rubber ring, two elastic packaging rubber ring relative inner side are evenly provided with multiple packaging clamping grooves, the utility model is designed as integrated structure by the "multistage water distribution and elastic partition packaging".It realizes the uniform distribution of water flow, pollution controllable and the significant improvement of packaging reliability by setting multistage gradually expanding water distribution channel at raw water inlet end, and using flexible pressure containment suit and modular end cap to carry out partition elastic packaging to membrane silk bundle.

Description

Technical Field

[0001] This utility model is a hollow fiber membrane reverse osmosis filter element, belonging to the field of reverse osmosis technology. Background Technology

[0002] Research on membrane separation technology began in the early 1950s with the development of reverse osmosis membranes to obtain fresh water from seawater or brackish water. Since the mid-1960s, membrane separation technology has truly achieved industrialization. The structure and type of membrane modules depend on the shape of the membrane. Industrially used membrane modules mainly include four types: hollow fiber, tubular, spiral wound, and plate-and-frame. Among them, hollow fiber membrane modules are widely used in drinking water, RO pretreatment in seawater desalination processes, food processing, pharmaceutical wastewater treatment, and environmental engineering applications. Reverse osmosis technology is one of the core processes in modern water treatment. Hollow fiber membranes, due to their large specific surface area, high packing density, and self-supporting structure, have become an important form of reverse osmosis membrane. Its filter element assembly is composed of thousands of hair-thin hollow fiber membrane filaments bundled and encapsulated in a pressure vessel. Traditional hollow fiber membrane reverse osmosis filter elements are divided into reverse osmosis filter elements with two outlet channels at both ends and reverse osmosis filter elements with improved traditional anti-fouling structures, etc. The structure of the traditional reverse osmosis filter element with two outlet channels at both ends consists of membrane filament bundles, epoxy resin-encapsulated head and tail seats, central water distribution pipe, and external pressure shell. In the reverse osmosis filter element with improved traditional anti-fouling structures, turbulence promoting nets or flow guide plates are added inside the membrane filament bundles.

[0003] However, in traditional reverse osmosis filter cartridges with two outlet channels, the raw water is distributed from the central pipe, which easily leads to a high overload on the membrane fibers near the center, while the utilization rate of the peripheral membrane fibers is low, forming a "channeling" phenomenon. This affects the overall efficiency and exacerbates membrane fouling, resulting in uneven water flow distribution. Inside the membrane fiber bundle, especially in areas far from the central pipe, "dead water zones" are easily formed, leading to locally excessively high solute concentrations (concentration polarization), accelerating membrane scaling and fouling. In traditional anti-fouling structure improved reverse osmosis filter cartridges, the flow guiding elements (turbulence promoting mesh or flow guide plates) increase water flow resistance, leading to increased system operating energy consumption. Rigid flow guide plates may rub against the membrane fibers during long-term operation or vibration, causing membrane fiber damage. There is an urgent need for a hollow fiber membrane reverse osmosis filter cartridge assembly to solve the above-mentioned problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a hollow fiber membrane reverse osmosis filter cartridge assembly to solve the problems mentioned in the background. This invention has the advantages of uniform water flow distribution, strong anti-fouling ability, and reliable encapsulation. It has a reasonable structure and integrates "multi-stage water distribution and flexible partition encapsulation" into an integrated structure. By setting multi-stage gradually expanding water distribution channels at the raw water inlet end and using flexible pressure-bearing sleeves and modular end caps to perform partitioned flexible encapsulation of the membrane fiber bundle, it achieves a significant improvement in uniform water flow distribution, controllable pollution, and encapsulation reliability, making it highly practical.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a hollow fiber membrane reverse osmosis filter cartridge assembly, comprising a filter cartridge encapsulation upper shell, radial branch pipes, and a central water distribution main pipe. A filter cartridge encapsulation lower shell is fixed to the lower end of the filter cartridge encapsulation upper shell. A central water distribution main pipe is longitudinally installed between the interior of the filter cartridge encapsulation upper shell and the filter cartridge encapsulation lower shell. Multiple radial branch pipes are radially and uniformly connected on the side surface of the central water distribution main pipe. A conical flow equalization hood is installed at the other end of each of the multiple radial branch pipes. Elastic encapsulation rings are embedded inside the filter cartridge encapsulation upper shell and the filter cartridge encapsulation lower shell. Multiple encapsulation slots are opened on the inner sides of the two elastic encapsulation rings. A large number of hollow fiber membrane bundles are longitudinally installed in the multiple encapsulation slots. A flexible pressure-bearing sleeve is installed on the inner wall of the filter cartridge encapsulation upper shell, and the flexible pressure-bearing sleeve is sleeved on the outside of the large number of hollow fiber membrane bundles.

[0006] The gap between the flexible pressure-bearing sleeve and the large number of hollow fiber membrane bundles forms an annular water production chamber. A cleaning interface pipe is installed on the lower left side of the annular water production chamber, and a cleaning pump is installed at the lower end of the cleaning interface pipe.

[0007] Furthermore, a water inlet valve is provided in the middle of the upper end of the filter element encapsulation shell, and a small water inlet flange is installed on the upper end of the water inlet valve.

[0008] Furthermore, the upper end of the central water distribution main pipe is connected to the opening at the upper end of the filter element encapsulation shell.

[0009] Furthermore, each of the multiple conical flow equalization hoods has a honeycomb hole at its other end, and the multiple honeycomb holes face the inner wall of a large number of hollow fiber membrane bundles.

[0010] Furthermore, a water production pipe is installed through the lower right side of the annular water production chamber, and a water production valve is installed on the outside of the water production pipe.

[0011] Furthermore, a concentrated water discharge pipe is installed at the lower end of the gap between the central water distribution main pipe and the right-side hollow fiber membrane bundle.

[0012] Furthermore, a concentrated water discharge valve is installed on the outside of the concentrated water discharge pipe.

[0013] The beneficial effects of this utility model are as follows: This utility model provides a hollow fiber membrane reverse osmosis filter element assembly. Because it adds a central water distribution main pipe, radial branch pipes, conical flow equalization hood, honeycomb holes, elastic sealing rings, sealing slots, hollow fiber membrane bundles, annular product water chambers, and flexible pressure-bearing sleeves, the structure is reasonable. By designing "multi-stage water distribution and elastic partition sealing" into an integrated structure, it sets up multi-stage gradually expanding water distribution channels at the raw water inlet end and uses flexible pressure-bearing sleeves and modular end caps to partition and elastically seal the membrane bundles, which significantly improves the uniform distribution of water flow, controllable pollution, and sealing reliability, making it highly practical. Attached Figure Description

[0014] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0015] Figure 1 This is a schematic diagram of the overall structure of a hollow fiber membrane reverse osmosis filter element assembly according to the present invention;

[0016] Figure 2 This is a schematic cross-sectional view of the upper and lower shells of the filter cartridge packaging of a hollow fiber membrane reverse osmosis filter cartridge assembly according to the present invention.

[0017] Figure 3 This is a schematic diagram of the central water distribution main pipe structure of a hollow fiber membrane reverse osmosis filter element assembly according to the present invention;

[0018] Figure 4 This is a schematic diagram of the hollow fiber membrane bundle structure of a hollow fiber membrane reverse osmosis filter element assembly according to the present invention;

[0019] Figure 5 This is a schematic diagram of the conical flow equalization hood structure of a hollow fiber membrane reverse osmosis filter element assembly according to the present invention;

[0020] Figure 6 This is a schematic diagram of the disassembled structure of the conical flow equalization hood of a hollow fiber membrane reverse osmosis filter element assembly according to the present invention;

[0021] Figure 7 This is a schematic diagram of a single-strand hollow fiber membrane bundle structure of a hollow fiber membrane reverse osmosis filter element according to the present invention.

[0022] In the diagram: 1-Filter cartridge upper shell, 2-Filter cartridge lower shell, 3-Small inlet flange, 4-Inlet valve, 5-Central water distribution main pipe, 6-Radial branch pipe, 7-Conical flow equalization hood, 8-Honeycomb hole, 9-Elastic encapsulation ring, 10-Encapsulation slot, 11-Hollow fiber membrane bundle, 12-Annular product water chamber, 13-Flexible pressure-bearing sleeve, 14-Product water pipe, 15-Product water valve, 16-Concentrate discharge pipe, 17-Concentrate discharge valve, 18-Cleaning interface pipe, 19-Cleaning pump. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0024] Please see Figures 1-7 This utility model provides a technical solution: a hollow fiber membrane reverse osmosis filter cartridge assembly, including a filter cartridge upper shell 1, radial branch pipes 6, and a central water distribution main pipe 5. A filter cartridge lower shell 2 is fixed to the lower end of the filter cartridge upper shell 1. A central water distribution main pipe 5 is longitudinally installed between the filter cartridge upper shell 1 and the filter cartridge lower shell 2. Multiple radial branch pipes 6 are radially and uniformly connected on the side surface of the central water distribution main pipe 5. A conical flow equalization hood 7 is installed at the other end of each of the multiple radial branch pipes 6. The filter cartridge upper shell 1 and the filter cartridge lower shell 2 are both embedded with... The filter cartridge has two elastic sealing rings 9, each with multiple sealing slots 10 on its inner side. A large number of hollow fiber membrane bundles 11 are longitudinally installed in each of the multiple sealing slots 10. A flexible pressure-bearing sleeve 13 is installed on the inner wall of the filter cartridge upper shell 1, and the flexible pressure-bearing sleeve 13 is fitted over the large number of hollow fiber membrane bundles 11. The gap between the flexible pressure-bearing sleeve 13 and the large number of hollow fiber membrane bundles 11 forms an annular water production chamber 12. A cleaning interface pipe 18 is installed on the lower left side of the annular water production chamber 12, and a cleaning pump 19 is installed at the lower end of the cleaning interface pipe 18.

[0025] As the first embodiment of this utility model: a water inlet valve 4 is provided in the middle of the upper end of the filter element encapsulation shell 1, and a small water inlet flange 3 is installed on the upper end of the water inlet valve 4. By adding the small water inlet flange 3 and the water inlet valve 4, it is convenient to quickly connect and disconnect the entire filter element assembly from the external water supply pipeline, which provides convenience for the installation, maintenance and isolation of the equipment.

[0026] The upper end of the central water distribution main pipe 5 is connected to the upper opening of the filter cartridge casing 1. This design ensures that the raw water entering from the inlet valve 4 can flow directly and smoothly into the central water distribution main pipe 5, forming the starting channel of the entire multi-stage water distribution system.

[0027] Multiple conical flow equalization hoods 7 have honeycomb holes 8 at their other ends, and the multiple honeycomb holes 8 are all facing the inner wall of a large number of hollow fiber membrane bundles 11. The added conical flow equalization hoods 7 and the honeycomb holes 8 on their surfaces constitute a precise final stage water distribution structure.

[0028] The conical structure helps water flow diffusion, while the evenly distributed honeycomb holes 8, like a shower head, break the water flow into multiple fine streams, spraying them onto the end face and inner side of the entire hollow fiber membrane bundle 11, fundamentally solving the "channeling" and edge "dead water zone" phenomena caused by traditional central water distribution.

[0029] A water production pipe 14 is installed through the lower right side of the annular water production chamber 12. A water production valve 15 is installed on the outside of the water production pipe 14. With this design, the pure water (product water) produced after being filtered by the hollow fiber membrane bundle 11 is collected in the annular water production chamber 12 and can be discharged through the water production pipe 14. The water production valve 15 is used to control the flow of product water and regulate its flow.

[0030] A concentrate discharge pipe 16 is installed at the lower end of the gap between the central water distribution main pipe 5 and the hollow fiber membrane bundle 11 on the right. Through the added concentrate discharge pipe 16 and concentrate discharge valve 17, the concentrated raw water (concentrate) that cannot pass through the membrane fibers can be discharged from the system through this channel.

[0031] A concentrated water discharge valve 17 is installed on the outside of the concentrated water discharge pipe 16. The concentrated water discharge valve 17 is used to regulate the concentrated water discharge volume and the system recovery rate, and can be used to drain the concentrated water during cleaning.

[0032] As a second embodiment of this utility model, its filtration process is as follows: Raw water enters the component through a small inlet flange 3 and an inlet valve 4, first flowing into the central water distribution main pipe 5. Subsequently, the water flow is distributed to multiple radially distributed branch pipes 6.

[0033] Finally, the water flows through the honeycomb holes 8 on the conical flow equalization hood 7 at the end of the branch pipe and is evenly sprayed onto the end face and inner area of ​​the entire hollow fiber membrane bundle 11. This three-stage water distribution pattern of "main pipe → branch pipe → flow equalization hood" ensures that the water flow is extremely uniformly distributed across the cross-section of the membrane bundle.

[0034] Driven by external pressure, raw water permeates from the outside to the inside of the membrane fiber bundle. Water molecules, under pressure, pass through the micropores of the hollow fiber membrane and enter the outer cavity of the membrane fiber, becoming pure product water. All the product water generated inside the membrane fiber gathers upwards or downwards and enters the annular product water cavity 12 formed between the flexible pressure-bearing sleeve 13 and the outside of the membrane fiber bundle.

[0035] Finally, the permeate flows out through the permeate pipe 14 and is controlled by the permeate valve 15. The contaminants that fail to pass through and the concentrated water continue to flow along the inner surface of the membrane bundle and are eventually discharged from the system through the concentrate discharge pipe 16. The concentrate discharge valve 17 is used to regulate the concentrate flow rate and system pressure.

[0036] As a third embodiment of this utility model: When it is necessary to clean the inside of this device, the product water valve 15 and the inlet water valve 4 can be closed. A cleaning pump 19 is connected through the cleaning interface pipe 18 to pump the cleaning solution, such as acid, alkali, or bactericide, into the annular product water chamber 12. Under pressure, the cleaning solution can either reverse-permeate the membrane fibers or circulate within the chamber, thoroughly and effectively flushing and chemically cleaning the outer wall of the membrane fibers. Finally, the waste liquid after cleaning can be discharged from the concentrate discharge pipe 16.

[0037] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A hollow fiber membrane reverse osmosis filter cartridge assembly, comprising a filter cartridge encapsulation shell (1), radial branch pipes (6), and a central water distribution main pipe (5), characterized in that: The filter element encapsulation upper shell (1) is fixed with a filter element encapsulation lower shell (2) at its lower end. A central water distribution main pipe (5) is installed longitudinally between the filter element encapsulation upper shell (1) and the filter element encapsulation lower shell (2). Multiple radial diversion branches (6) are installed radially and uniformly on the side surface of the central water distribution main pipe (5). A conical flow equalization hood (7) is installed at the other end of each of the multiple radial diversion branches (6). Elastic encapsulation rings (9) are embedded inside the filter element encapsulation upper shell (1) and the filter element encapsulation lower shell (2). Multiple encapsulation slots (10) are opened on the inner sides of the two elastic encapsulation rings (9). A large number of hollow fiber membrane bundles (11) are installed longitudinally in the multiple encapsulation slots (10). A flexible pressure-bearing sleeve (13) is installed on the inner wall of the filter element encapsulation upper shell (1), and the flexible pressure-bearing sleeve (13) is sleeved on the outside of the large number of hollow fiber membrane bundles (11). The gap between the flexible pressure-bearing sleeve (13) and the large number of hollow fiber membrane bundles (11) forms an annular water production chamber (12). A cleaning interface pipe (18) is installed on the lower left side of the annular water production chamber (12), and a cleaning pump (19) is installed at the lower end of the cleaning interface pipe (18).

2. The hollow fiber membrane reverse osmosis filter element according to claim 1, characterized in that: The filter element encapsulation shell (1) has an inlet valve (4) in the middle of its upper end, and a small inlet flange (3) is installed on the upper end of the inlet valve (4).

3. The hollow fiber membrane reverse osmosis filter element according to claim 1, characterized in that: The upper end of the central water distribution main pipe (5) is connected to the upper opening of the filter element encapsulation shell (1).

4. The hollow fiber membrane reverse osmosis filter element according to claim 1, characterized in that: Each of the multiple conical flow equalization hoods (7) has a honeycomb hole (8) at its other end, and the multiple honeycomb holes (8) are all facing the inner wall of a large number of hollow fiber membrane bundles (11).

5. A hollow fiber membrane reverse osmosis filter element assembly according to claim 1, characterized in that: A water production pipe (14) is installed through the lower right side of the annular water production chamber (12), and a water production valve (15) is installed on the outside of the water production pipe (14).

6. The hollow fiber membrane reverse osmosis filter element according to claim 1, characterized in that: A concentrated water discharge pipe (16) is installed at the lower end of the gap between the central water distribution main pipe (5) and the hollow fiber membrane bundle (11) on the right.

7. A hollow fiber membrane reverse osmosis filter element assembly according to claim 6, characterized in that: A concentrated water discharge valve (17) is installed on the outside of the concentrated water discharge pipe (16).

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