Membrane filtration unit

Abstract

The present invention discloses a membrane filtration unit, which includes two integrated end caps, upper and lower, and a number of membrane housing assemblies located between the integrated end caps; the integrated end caps are provided with an independent outer cavity and an inner cavity, one side of the outer cavity is provided with a first inlet and outlet, one side of the inner cavity is provided with a second inlet and outlet, the inner cavity is provided with a first air passage communicating with the second inlet and outlet, and a number of gas collection chambers, the gas collection chambers are connected to the first air passage through air distribution ports, an aeration port is provided below the number of gas collection chambers, and a gas collection structure capable of generating large bubbles with a constant volume is provided in the gas collection chambers; a ring-shaped distribution of hollow fiber membrane filaments is provided inside the membrane housing assembly, the hollow fiber membrane filaments divide the internal space of the membrane housing assembly into an inner cavity and an outer cavity, the membrane housing assembly is provided with a water distribution trough ring at the upper and lower end faces of the outer cavity, the membrane housing assembly is provided with an upper water collection cavity and a lower water collection cavity at the upper and lower end faces of the inner cavity respectively, the upper water collection cavity and the lower water collection cavity are connected through a central tube, and a second air passage is provided at the lower end face of the outer cavity.

Description

Technical Field

[0001] The invention belongs to the technical field of water treatment, and in particular relates to a membrane filtration unit. Background Art

[0002] During membrane filtration equipment installation, membrane assemblies or elements are connected through numerous pipes, fittings, and support frames to form the basic membrane filtration unit. These pipe connections and fixation are typically completed at the factory or project construction site. However, many of these pipe connection operations are non-standardized, varying depending on project requirements. This results in significant workload, low efficiency, and increased costs.

[0003] Many user sites are located in remote areas, making transportation extremely inconvenient. Currently, the support frames for membrane filtration systems must be fabricated in factories or on-site. Their large size and weight make them difficult to transport, requiring large-scale machinery for loading and unloading at site. This increases the workload, reduces installation efficiency, and increases costs.

[0004] Currently, membrane filtration systems require a large amount of space for installation, resulting in high land investment costs. Sometimes, installation site space is also limited, so it is desirable to minimize the space required to accommodate more membrane modules or units. Irregular and complex piping reduces space utilization, hindering the ability to increase the density of membrane modules within the installation space and reducing costs.

[0005] During the production and assembly process, some structural parts inside the membrane filtration system cannot be manufactured through a one-time molding method. They need to be manufactured separately and then assembled as a whole. The overall assembly involves operations such as connection and sealing between parts. If the membrane filtration system is relatively large, there will be more parts involved. If the manufacturing and assembly methods are not selected properly, the workload of connection and sealing between these parts will be huge, which will also lead to problems such as reduced work efficiency and increased costs.

[0006] At some user sites, the water quality is poor, which limits the service life of the membrane. A reasonable process is needed to maximize the performance of the filter membrane, extend its service life, and achieve the highest economic benefits.

[0007] Based on the above information, we can summarize the problems existing in membrane filtration technology:

[0008] 1. The customer's on-site construction workload is large, the efficiency is low, and the construction quality cannot be controlled. A structure that reduces the workload of on-site equipment installation is needed;

[0009] 2. The customer's site is relatively remote, and large machinery cannot be used. The installation equipment requires a quick assembly structure to reduce the size of individual components, so that the equipment can be easily transported to the site and can be quickly assembled;

[0010] 3. The site area that the customer can provide is limited, and a compact equipment structure is required to save land space;

[0011] 4. The existing membrane filtration process has poor rationality, resulting in a reduced service life of the membrane. Therefore, a new membrane filtration process is needed to make the membrane have stronger dirt removal ability and resistance to dirt, make the role of the membrane play more thoroughly, and effectively extend the service life of the membrane. Summary of the Invention

[0012] In view of the problems raised in the above background art, the object of the present invention is to provide a membrane filtration unit.

[0013] To achieve the above technical object, the technical solution adopted by the present invention is as follows:

[0014] A membrane filtration unit, which includes two integrated end caps, upper and lower, a plurality of membrane shell components located between the integrated end caps, and a V-groove chuck for connecting the integrated end caps and the membrane shell components;

[0015] The integrated end cap is provided with an independent outer cavity and an inner cavity. One side of the outer cavity is provided with a first inlet and outlet, and one side of the inner cavity is provided with a second inlet and outlet. The orientations of the first inlet and outlet and the second inlet and outlet are opposite. The inner cavity is provided with a first air duct communicating with the second inlet and outlet, and a plurality of gas collection chambers with equal volumes. The gas collection chambers are connected to the first air duct through air distribution ports. Below the plurality of gas collection chambers is provided an aeration port, and a gas collection structure capable of generating large bubbles with a constant volume is provided in the gas collection chamber;

[0016] The inside of the membrane shell component is provided with a ring-shaped distribution of hollow fiber membrane filaments. The hollow fiber membrane filaments divide the internal space of the membrane shell component into an inner cavity and an outer cavity. The upper and lower end faces of the outer cavity of the membrane shell component are provided with a water distribution trough ring connected to the outer cavity. The upper and lower end faces of the inner cavity of the membrane shell component are respectively provided with an upper water collection cavity and a lower water collection cavity. The upper water collection cavity and the lower water collection cavity are connected through a central pipe. The lower end face of the inner cavity is provided with a second air duct.

[0017] Further defined, the integrated end cap and the membrane shell component are sealed by an O-ring.

[0018] Further defined, the integrated end cap is integrated in the form of an array arrangement of multiple single end caps.

[0019] Further defined, the number of membrane shell components in the membrane filtration unit is four, or an integer multiple of two.

[0020] Further defined, a single membrane filtration unit is connected to the external pipeline through a flexible copy link bush.

[0021] Further defined, solenoid valves are connected to both the first inlet / outlet and the second inlet / outlet of the integrated end cap, and the solenoid valves are electrically connected to the control cabinet.

[0022] Further defined, the first inlet / outlet of the integrated end cap above is connected to the raw water inlet main pipe, the second inlet / outlet of the integrated end cap above is connected to the water outlet main pipe, the other end of the water outlet main pipe is connected to the clear water tank, the first inlet / outlet of the integrated end cap below is connected to the total sewage pipeline, and the second inlet / outlet of the integrated end cap below is connected to the air inlet main pipe.

[0023] Advantages of the present invention:

[0024] 1. Modular design, flexible combination, can be arranged and installed according to different on-site environments;

[0025] 2. Flexible and diverse specifications, suitable for various water volumes, and the number of membrane filtration units can be increased or decreased according to different water consumption;

[0026] 3. The membrane filtration units are arranged in a matrix, which is more stable than the single-row and single-column arrangement, and a single membrane filtration unit can also be stably installed;

[0027] 4. The on-site assembly of the equipment is convenient. Each component can be processed and assembled in the factory, and the loose parts are sent to the site. After arriving at the site, there is no need for on-site welding, and only assembly is required. The construction and installation are simple and easy to operate;

[0028] 5. It is convenient and labor-saving to transport to the site. Each component can be carried by one person, and there are no oversized components, saving installation and transportation costs;

[0029] 6. Small space area occupation, integrated design, small overall floor area of the equipment, and at the same time saving fittings such as pipe fittings, bolts, and nuts required during installation;

[0030] 7. Aeration is continuously carried out during the filtration operation to clean the hollow fiber membrane filaments, ensuring the longest working time of the hollow fiber membrane filaments, greatly improving the total water production capacity of the equipment, and at the same time, the aeration process will not cause the disturbance of the dirt in the sewage collection tank. Description of the Drawings

[0031] The present invention can be further illustrated by the non-limiting embodiments given in the drawings;

[0032] Figure 1 It is a schematic structural diagram of an embodiment of the membrane filtration unit of the present invention;

[0033] Figure 2 It is an axonometric view of the integrated end cap in the embodiment of the membrane filtration unit of the present invention;

[0034] Figure 3This is the front view of the integrated end cap in the membrane filtration unit embodiment of the present invention;

[0035] Figure 4 This is the cross-sectional view of the integrated end cap in the membrane filtration unit embodiment of the present invention;

[0036] Figure 5 This is the left cross-sectional view of the integrated end cap in the membrane filtration unit embodiment of the present invention;

[0037] Figure 6 This is the enlarged view of part A in the membrane filtration unit embodiment of the present invention;

[0038] Figure 7 This is the enlarged view of part B in the membrane filtration unit embodiment of the present invention;

[0039] Figure 8 This is the first arrangement form diagram in the membrane filtration unit embodiment of the present invention;

[0040] Figure 9 This is the second arrangement form diagram in the membrane filtration unit embodiment of the present invention;

[0041] Figure 10 This is the enlarged view of part C in the membrane filtration unit embodiment of the present invention;

[0042] The main element symbols are explained as follows:

[0043] Integrated end cap 1, V-groove chuck 3, O-ring 4;

[0044] Outer cavity 101, inner cavity 102, first air duct 102-1, air distribution port 102-2, air collection chamber 102-3, first inlet / outlet 103, second inlet / outlet 104, aeration port 105;

[0045] Membrane shell assembly 2, second air duct 202, water distribution trough ring 203, central tube 205, lower water collection cavity 206, upper water collection cavity 207, hollow fiber membrane filaments 210;

[0046] Raw water inlet main pipe 801, water outlet main pipe 802, total sewage pipeline 803, air inlet main pipe 804, control cabinet 805, solenoid valve 806, copy link ferrule 807. Detailed implementation manners

[0047] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below in conjunction with the drawings and embodiments.

[0048] As Figures 1-10 shown, the membrane filtration unit of the present invention includes two upper and lower integrated end caps 1, a plurality of membrane shell assemblies 2 located between the integrated end caps 1, and a V-groove chuck 3 for connecting the integrated end caps 1 and the membrane shell assemblies 2;

[0049] The integrated end cap 1 is provided with an independent outer cavity 101 and an inner cavity 102. One side of the outer cavity 101 is provided with a first inlet / outlet 103, and one side of the inner cavity 102 is provided with a second inlet / outlet 104. The orientations of the first inlet / outlet 103 and the second inlet / outlet 104 are opposite. The inner cavity 102 is provided with a first air passage 102-1 communicating with the second inlet / outlet 104, and a number of gas collecting chambers 102-3 with equal volumes. The gas collecting chambers 102-3 are connected to the first air passage 102-1 through air distribution ports 102-2. Below the number of gas collecting chambers 102-3, there are aeration ports 105. A gas collecting structure capable of generating large air bubbles with a constant volume is arranged in the gas collecting chambers 102-3;

[0050] Inside the membrane housing assembly 2, there are annularly distributed hollow fiber membrane filaments 210. The hollow fiber membrane filaments 210 divide the internal space of the membrane housing assembly 2 into an inner cavity and an outer cavity. The membrane housing assembly 2 is provided with a water distribution trough ring 203 communicating with the outer cavity 101 at the upper and lower end faces of the outer cavity, and an upper water collecting cavity 207 and a lower water collecting cavity 206 are respectively arranged at the upper and lower end faces of the inner cavity of the membrane housing assembly 2. The upper water collecting cavity 207 and the lower water collecting cavity 206 are communicated through a central pipe 205. A second air passage 202 is arranged at the lower end face of the inner cavity.

[0051] Preferably, the integrated end cap 1 and the membrane housing assembly 2 are sealed by an O-ring 4. In fact, other sealing structures between the integrated end cap 1 and the membrane housing assembly 2 can also be considered according to specific situations.

[0052] Preferably, the integrated end cap 1 is integrated in a way that multiple single end caps are arranged in an array. In fact, other structural shapes of the integrated end cap 1 can also be considered according to specific situations.

[0053] Preferably, the number of membrane housing assemblies 2 in the membrane filtration unit is four, or an integer multiple of two. In fact, other numbers of the membrane housing assemblies 2 can also be considered according to specific situations.

[0054] Preferably, the single membrane filtration unit is connected to the external pipeline through a flexible Copyrighlink coupling 807. In fact, other connection structures between the membrane filtration unit and the external pipeline can also be considered according to specific situations.

[0055] Preferably, solenoid valves 806 are connected to both the first inlet / outlet 103 and the second inlet / outlet 104 of the integrated end cap 1, and the solenoid valves 806 are electrically connected to the control cabinet 805. In fact, other control methods for the first inlet / outlet 103 and the second inlet / outlet 104 can also be considered according to specific situations.

[0056] Preferably, the first inlet / outlet 103 of the upper integrated end cap 1 is connected to the raw water inlet main pipe 801, and the second inlet / outlet 104 of the upper integrated end cap 1 is connected to the outlet main pipe 802. The other end of the outlet main pipe 802 is connected to the clear water tank. The first inlet / outlet 103 of the lower integrated end cap 1 is connected to the total sewage discharge pipeline 803, and the second inlet / outlet 104 of the lower integrated end cap 1 is connected to the air inlet main pipe 804. In fact, other structural shapes of air inlet and water inlet can also be considered according to specific situations.

[0057] In the implementation of this case,

[0058] Combined with Figures 1-7 , when the membrane filtration unit is working, the raw water enters the outer cavity 101 of the upper integrated end cap 1 from the first inlet / outlet 103 at the upper part of the membrane filtration unit, and enters each membrane shell assembly through the water distribution trough ring 203. The clear water permeates through the hollow fiber membrane filaments 210 and is collected in the lower water collection cavity 206 and the upper water collection cavity 207. The central pipe 205 connects the lower water collection cavity 206 and the upper water collection cavity 207. The clear water enters the inner cavity 102 of the upper integrated end cap 1 from the aeration port 105 and flows out through the second inlet / outlet 104. The second inlet / outlet 104 at the upper part is connected to the clear water tank through the outlet main pipe 802. The impurities in the raw water are intercepted by the hollow fiber membrane filaments 210 in the outer cavity of the membrane shell assembly 2, and the impurities sink and are collected in the outer cavity 101 of the bottom integrated end cap 1 through the water distribution trough ring 203. After a period of deposition, they are discharged to the total sewage discharge pipeline 803 from the first inlet / outlet 103 at the bottom. This kind of sewage collection structure can store the dirt in the raw water to the maximum extent, so that the hollow fiber membrane filaments 210 can work continuously for the longest time;

[0059] Combined with Figures 1-7 , when the membrane filtration unit is subjected to air washing, the compressed air enters the inner cavity 102 of the lower integrated end cap 1 from the lower second inlet / outlet 104. The compressed air enters the first air duct 102-1 from the second inlet / outlet 104 at the lower part, and then enters four or more equal-sized air collection chambers 102-3 respectively through the air distribution port 102-2. Due to the air collection structure in the air collection chamber 102-3, large bubbles with a constant size are generated, that is, the continuous air flow in a period of time is collected to form bubbles with a relatively large impact force. These bubbles are sufficient to shake each hollow fiber membrane filament 210 inside the membrane shell assembly 2, so as to effectively clean the hollow fiber membrane filaments 210. The bubbles enter the inner side of the hollow fiber membrane filaments 210 through the second air duct 202 for scrubbing, and the bubbles will also enter the outer side of the hollow fiber membrane filaments 210 through the water distribution trough ring 203 for scrubbing. Finally, the bubbles are discharged retrogradely through the bypass at the water inlet;

[0060] Combined with Figure 8 、 Figure 9 、 Figure 10, which shows two arrangement forms of multiple membrane filtration units. The two forms are not limited to these, and appropriate arrangements can also be made according to the actual situation on site. At the same time, the number of matrix membrane filtration units can be increased or decreased according to different water volumes. Raw water enters each branch pipeline from the raw water inlet main pipeline 801, and then enters the membrane filtration unit. After being filtered by the membrane filtration unit, the clear water in each clear water branch pipeline flows into the outlet main pipeline 802. The other end of the outlet main pipeline 802 is connected to the clear water tank. Compressed air enters each branch pipeline from the air inlet main pipeline 804, and then enters the interior of the membrane filtration unit to wash the hollow fiber membrane filaments 210. After the filtered raw water is precipitated for a period of time, it flows into the total sewage discharge pipeline 803 from each branch pipeline. The other end of the total sewage discharge pipeline 803 is connected to the on-site sewage pipeline. All electrical components are installed inside the control cabinet 805, and the control cabinet 805 is installed in a suitable place according to the on-site situation;

[0061] As Figure 7 shown, the connection between each membrane filtration unit and the pipeline is fixed by using a flexible copy ring ferrule 807. When the hollow fiber membrane filaments 210 are cleaned, the water inlet / outlet and air inlet / outlet of each membrane filtration unit are controlled by solenoid valves 806. Each membrane filtration unit can be cleaned independently, and other membrane filtration units can work normally during cleaning without affecting normal water supply.

[0062] The above embodiments only exemplarily illustrate the principles and effects of the present invention, rather than limiting the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. Membrane filtration unit, characterized in that: The membrane filtration unit comprises two upper and lower integrated end covers (1), a plurality of membrane shell assemblies (2) located between the integrated end covers (1), and a V-groove chuck (3) for connecting the integrated end covers (1) and the membrane shell assemblies (2); The integrated end cover (1) is provided with an outer cavity (101) and an inner cavity (102) that are independent of each other; a first inlet and outlet (103) is provided on one side of the outer cavity (101); a second inlet and outlet (104) is provided on one side of the inner cavity (102); the first inlet and outlet (103) and the second inlet and outlet (104) are oriented in opposite directions; the inner cavity (102) is provided with a first air channel (102-1) communicating with the second inlet and outlet (104), and a plurality of gas collecting chambers (102-3) of equal volume; the gas collecting chambers (102-3) are connected to the first air channel (102-1) via gas splitting ports (102-2); aeration ports (105) are provided below the plurality of gas collecting chambers (102-3); and a gas collecting structure capable of generating large bubbles of constant volume is provided in the gas collecting chambers (102-3); The interior of the membrane shell assembly (2) is provided with annularly distributed hollow fiber membrane threads (210), and the hollow fiber membrane threads (210) divide the internal space of the membrane shell assembly (2) into an inner cavity and an outer cavity. The membrane shell assembly (2) is provided with a water distribution trough ring (203) connected to the outer cavity body (101) at the upper and lower end surfaces of the outer cavity. The membrane shell assembly (2) is provided with an upper water collecting chamber (207) and a lower water collecting chamber (206) at the upper and lower end surfaces of the inner cavity, respectively. The upper water collecting chamber (207) and the lower water collecting chamber (206) are connected through a central tube (205), and the lower end surface of the inner cavity is provided with a second air duct (202).

2. The membrane filtration unit according to claim 1, characterized in that: The integrated end cover (1) and the membrane housing assembly (2) are sealed via an O-ring (4).

3. The membrane filtration unit according to claim 2, wherein: The integrated end cap (1) is integrated into one body in the form of a plurality of single end caps arranged in an array.

4. The membrane filtration unit according to claim 3, characterized in that: The number of membrane shell components (2) in the membrane filtration unit is an integer multiple of two.

5. The membrane filtration unit according to claim 3, characterized in that: The number of membrane shell assemblies (2) in the membrane filtration unit is an integer multiple of four.

6. The membrane filtration unit according to claim 4, characterized in that: The single membrane filtration unit is connected to the external pipeline via a flexible copy forest sleeve (807).

7. The membrane filtration unit according to claim 6, characterized in that: The first inlet and outlet (103) and the second inlet and outlet (104) of the integrated end cover (1) are both connected to a solenoid valve (806), and the solenoid valve (806) is electrically connected to the control cabinet (805).

8. The membrane filtration unit according to claim 7, characterized in that: The first inlet and outlet (103) of the upper integrated end cover (1) is connected to a raw water inlet main pipe (801), the second inlet and outlet (104) of the upper integrated end cover (1) is connected to a water outlet main pipe (802), the other end of the water outlet main pipe (802) is connected to a clean water tank, the first inlet and outlet (103) of the lower integrated end cover (1) is connected to a main sewage discharge pipeline (803), and the second inlet and outlet (104) of the lower integrated end cover (1) is connected to an air intake main pipe (804).

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