Ultrafiltration membrane assembly and cleaning method thereof

Abstract

The ultrafiltration membrane assembly comprises a membrane shell, a containing cavity is formed in the membrane shell, an ultrafiltration membrane set is arranged in the containing cavity, the ultrafiltration membrane set comprises a central tube, ultrafiltration membrane wires and an ultrafiltration membrane cover, and the central tube, the ultrafiltration membrane wires and the ultrafiltration membrane cover are fixed through sealing glue; the device further comprises an electromagnetic vibration assembly, the electromagnetic vibration assembly comprises a vibration ring, a mounting sleeve and an electromagnet, the mounting sleeve is attached to the inner wall of the membrane shell, the outer side of the ultrafiltration membrane wire is sleeved with the vibration ring, and the vibration ring is connected with the mounting sleeve through an elastic piece; at least one magnet block is embedded in the vibrating ring, the electromagnet is mounted on the outer side wall of the membrane shell, and magnetic poles on the electromagnet can be alternately changed to drive the vibrating ring to drive the ultrafiltration membrane filaments to vibrate. The vibrating ring is arranged in the membrane shell, the vibrating ring is used for driving the ultrafiltration membrane filaments to vibrate during flushing, dirt attached to the ultrafiltration membrane filaments is cleaned through vibration and water flow impact force, cleaning of the dirt attached to the membrane filaments is accelerated, the cleaning efficiency and the cleaning strength are improved, and the service life of the membrane filaments is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of ultrafiltration membranes, and in particular to an ultrafiltration membrane assembly and a cleaning method thereof. Background Art

[0002] Ultrafiltration is a membrane separation technology whose membrane is a porous asymmetric structure. The ultrafiltration filtration process is a solution separation process based on the mechanical screening principle and driven by the pressure difference on both sides of the membrane. The full operation cycle of ultrafiltration is: water production, backwashing, forward washing, water production, and so on repeatedly.

[0003] Ultrafiltration membrane water purification is divided into two types: external pressure type and internal pressure type. When the external pressure ultrafiltration membrane is purifying water, the raw liquid will penetrate from the outer wall of the membrane fiber to the inner wall of the membrane fiber, resulting in a large amount of pollutants attached to the outer surface of the membrane fiber. Due to the obstruction of the membrane shell, the pollutants cannot be carried away by water. After a period of water purification, it will cause the ultrafiltration membrane to be blocked until the membrane element fails. Therefore, the membrane fiber needs to be flushed after the ultrafiltration membrane has been used for a period of time.

[0004] Backwashing is the most effective way to clean the impurities of the ultrafiltration membrane, which can prevent the ultrafiltration membrane from being contaminated and extend the service life of the ultrafiltration membrane. Backwashing can remove most of the dirt, but some stubborn dirt will still remain on the surface of the membrane. After long-term use, the membrane surface will still be blocked and the water flow rate will decrease, resulting in the need to replace the membrane, resulting in an increase in the cost of use. Summary of the invention

[0005] In order to solve the above problems, the present invention provides an ultrafiltration membrane assembly and a cleaning method thereof, which can improve the cleaning efficiency of membrane filaments and extend the service life of membrane filaments.

[0006] To this end, the technical solution of the present invention is: an ultrafiltration membrane assembly, including a membrane shell, a cavity inside the membrane shell, an ultrafiltration membrane group is arranged in the cavity, the ultrafiltration membrane group includes a central tube, an ultrafiltration membrane wire and an ultrafiltration membrane cover, and the three are fixed by sealing glue; it also includes an electromagnetic vibration assembly, the electromagnetic vibration assembly includes a vibration ring, a mounting sleeve and an electromagnet, the mounting sleeve is fitted with the inner wall of the membrane shell, the vibration ring is sleeved on the outside of the ultrafiltration membrane wire, and the vibration ring and the mounting sleeve are connected by an elastic part; at least one magnet block is embedded in the vibration ring, and the electromagnet is installed on the outer wall of the membrane shell, and the magnetic poles on the electromagnet can change alternately, that is, the electromagnet and the magnet block switch between an attractive state and a repulsive state, driving the vibration ring to drive the ultrafiltration membrane wire to vibrate.

[0007] On the basis of the above scheme and as a preferred scheme of the above scheme: the vibration ring includes an outer ring, an inner ring and a connecting rod, the outer ring is sleeved on the outside of the ultrafiltration membrane wire, and the inner ring is placed on the inside of the ultrafiltration membrane wire.

[0008] On the basis of the above scheme and as a preferred scheme of the above scheme: the electromagnet is fixed on the outer wall of the membrane shell through an electromagnet mounting seat, the electromagnet is connected to alternating current through a wire, and the magnetic poles on the electromagnet change periodically with the alternating current.

[0009] On the basis of the above scheme and as a preferred scheme of the above scheme: two magnet blocks are embedded in the vibration ring, and the circumferential angle between the two magnet blocks is 45 degrees to 135 degrees.

[0010] On the basis of the above scheme and as a preferred scheme of the above scheme: the vibration ring is connected to the mounting sleeve via a spring or an elastic rope.

[0011] On the basis of the above solution and as a preferred solution of the above solution: the installation sleeve is interference fit with the inner wall of the membrane shell and is fixed in the middle of the inner wall of the membrane shell.

[0012] On the basis of the above scheme and as a preferred scheme of the above scheme: a water outlet is provided on the end cover, and the water outlet is connected to the water outlet hole inside the ultrafiltration membrane wire; the end of the central tube is a water inlet, and the end of the membrane shell extends from the middle of the water outlet; a flushing outlet is provided on the side of the end cover.

[0013] Another technical solution of the present invention is: in the cleaning method of the above-mentioned ultrafiltration membrane assembly, during the flushing stage, the electromagnet is energized, and the magnetic pole of the electromagnet changes periodically, attracting the magnet block or repelling the magnet block, driving the vibration ring to swing back and forth toward the electromagnet or away from the electromagnet. During the swinging process of the vibration ring, it contacts the ultrafiltration membrane filament and drives the ultrafiltration membrane filament to vibrate. The dirt attached to the surface of the ultrafiltration membrane filament is detached by the cooperation of vibration and flushing water, thereby completing the cleaning of the ultrafiltration membrane filament.

[0014] On the basis of the above scheme and as a preferred scheme of the above scheme: the multiple electromagnets on the outer side of the membrane shell can be energized alternately to drive the vibration ring to swing in different directions, thereby driving all ultrafiltration membrane filaments to vibrate.

[0015] On the basis of the above scheme and as a preferred scheme of the above scheme: during the flushing process, the water outlet is closed, the raw water enters the ultrafiltration membrane group from the central tube, and rushes to the ultrafiltration membrane fibers through the water inlet holes on the central tube, flushing the membrane fibers from the inside to the outside, and the waste water after flushing flows out through the flushing outlet.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. A vibration ring is set inside the membrane shell to drive the ultrafiltration membrane wire to vibrate during flushing. The vibration and water flow force are used to clean the dirt attached to the ultrafiltration membrane wire. Compared with simple water flushing, the vibration of the membrane wire can speed up the cleaning speed of the attached dirt, improve the cleaning efficiency and cleaning intensity, and extend the service life of the membrane wire.

[0018] 2. The non-contact characteristics of the electromagnet and the magnet block are used to drive the vibration ring. The electromagnet is located outside the membrane shell and will not interfere with the normal filtration process inside the membrane shell. Multiple electromagnets are set outside the membrane shell to drive the vibration ring to move in different directions.

[0019] 3. The vibration ring is connected to the mounting sleeve through a spring or elastic rope. The elastic parts such as the spring or elastic rope will not affect the vibration of the vibration ring, and can also assist the vibration ring to reset, ensuring that the vibration ring remains in a balanced state when idle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural cross-sectional view of the present invention;

[0021] Figure 2 for Figure 1 A partial enlarged view of

[0022] Figure 3 It is a schematic diagram of the internal structure of the present invention;

[0023] Figure 4 It is a transverse cross-sectional view of the structure of the present invention;

[0024] Figure 5 It is a schematic diagram of the installation of the electromagnetic vibration component of the present invention;

[0025] Figure 6 It is a schematic diagram of the structure of the vibration ring of the present invention.

[0026] Marked in the figure are: membrane shell 1, cavity 11, ultrafiltration membrane group 2, central tube 21, ultrafiltration membrane filament 22, ultrafiltration membrane cover 23, water inlet 24, end cover 3, water outlet 31, flushing outlet 32, electromagnetic vibration component 4, vibration ring 41, outer ring 411, inner ring 412, connecting rod 413, mounting sleeve 42, electromagnet 43, elastic member 44, magnet block 45, electromagnet mounting seat 46. DETAILED DESCRIPTION

[0027] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the present invention, "several" and "a number" mean two or more, unless otherwise clearly and specifically defined.

[0029] See the attached drawings. The ultrafiltration membrane assembly described in this embodiment includes a membrane shell 1, the membrane shell 1 has a cavity 11 inside, an ultrafiltration membrane group 2 is arranged in the cavity 11, and the ultrafiltration membrane group 2 includes a central tube 21, an ultrafiltration membrane filament 22 and an ultrafiltration membrane cover 23, and the three are fixed by sealing glue; the end cover 3 is provided with a water outlet 31, and the water outlet 31 is connected to the water outlet hole inside the ultrafiltration membrane filament 22; the end of the central tube 21 is a water inlet, and the end of the membrane shell extends from the middle of the water outlet, and the central tube 21 is provided with a plurality of water inlet holes 24, and a water inlet channel is formed inside the central tube 21; the side of the end cover 3 is provided with a flushing outlet 32.

[0030] This embodiment also includes an electromagnetic vibration assembly 4, which includes a vibration ring 41, a mounting sleeve 42 and an electromagnet 43. The mounting sleeve 42 is interference-fitted with the inner wall of the membrane shell 1 and fixed in the middle of the inner wall of the membrane shell 1. The vibration ring 41 is placed inside the mounting sleeve 42, and the vibration ring 41 and the mounting sleeve 42 are connected by an elastic member 44. The elastic member 44 can be a spring or an elastic rope, which will not interfere with the swing of the vibration ring and can assist the vibration ring in resetting.

[0031] The vibration ring 41 includes an outer ring 411, an inner ring 412 and a connecting rod 413. The outer ring 411 is sleeved on the outer side of the ultrafiltration membrane filament 22, and the inner ring 412 is placed on the inner side of the ultrafiltration membrane filament 22. The inner ring 412 and the outer ring 411 are connected by the connecting rod 413, and a vibration gap is left between the inner ring 412 and the central tube 21, that is, the central tube 21 will not interfere with the swing of the vibration ring 41. Two magnet blocks 45 are embedded on the outer ring of the vibration ring 41, and the circumferential angle of the two magnet blocks 45 is 90 degrees. The electromagnet 43 is fixed on the outer wall of the membrane shell 1 through the electromagnet mounting seat 46, and the electromagnet 43 and the magnet block 45 are opposite in position.

[0032] The electromagnet 43 is connected to alternating current through a wire, and the magnetic poles on the electromagnet 43 change periodically with the alternating current, that is, the electromagnet 43 and the magnet block 45 switch between an attractive state and a repulsive state. For example, the magnet block 45 is an N pole on the side facing the electromagnet, and the magnetic pole of the electromagnet 43 on the side facing the magnet block 45 switches between an N pole and an S pole. When the magnetic pole of the electromagnet 43 on the side facing the magnet block 45 is an N pole, the vibration ring 41 is driven to move away from the electromagnet 43. When the magnetic pole of the electromagnet 43 on the side facing the magnet block 45 is an S pole, the vibration ring 41 is attracted to move toward the electromagnet 43. Finally, the vibration ring 41 swings back and forth, driving the ultrafiltration membrane filament 22 to vibrate.

[0033] The first electromagnet and the second electromagnet on the outside of the membrane shell 1 can be energized alternately to drive the vibration ring to swing in different directions, driving all the ultrafiltration membrane filaments to vibrate. For example, the first electromagnet is located at the front end of the membrane shell, and the second electromagnet is located on the right side of the membrane shell. The first electromagnet can drive the vibration ring to swing back and forth, and the second electromagnet can drive the vibration ring to swing left and right, so that the vibration ring can drive most of the membrane filaments to vibrate.

[0034] When in use, raw water enters the ultrafiltration membrane group 2 from the central tube 21. There are outwardly scattered water inlet holes 24 around the front section of the ultrafiltration membrane central tube 21. The raw water flows to the ultrafiltration membrane filaments 22 through the water inlet holes 24. The clean water is filtered by the ultrafiltration membrane filaments 22 and then converges on the ultrafiltration membrane cover 23, flows into the water outlet column, and the clean water is filtered from the water outlet column.

[0035] During the flushing process, the water outlet is closed, and the raw water enters the ultrafiltration membrane group 2 from the central tube 21, and rushes toward the ultrafiltration membrane filament 22 through the water inlet hole 24 on the central tube 21, flushing the membrane filament from the inside to the outside; at the same time, the electromagnet 43 is connected to alternating current, and the magnetic pole of the electromagnet 43 changes periodically, attracting the magnet block 45 or repelling the magnet block 45, driving the vibration ring 41 to swing back and forth between toward the electromagnet 43 or away from the electromagnet 43. During the swinging process of the vibration ring 41, it contacts the ultrafiltration membrane filament 22 and drives the ultrafiltration membrane filament 22 to vibrate. The dirt attached to the surface of the ultrafiltration membrane filament 22 is detached under the cooperation of vibration and flushing water, completing the cleaning of the ultrafiltration membrane filament 22, and the flushed wastewater flows out through the flushing outlet 12.

[0036] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An ultrafiltration membrane assembly, comprising a membrane shell, a cavity inside the membrane shell, an ultrafiltration membrane group arranged in the cavity, the ultrafiltration membrane group comprising a central tube, an ultrafiltration membrane wire and an ultrafiltration membrane cover, the three being fixed by sealing glue; characterized in that: It also includes an electromagnetic vibration component, which includes a vibration ring, a mounting sleeve and an electromagnet. The mounting sleeve is in contact with the inner wall of the membrane shell, the vibration ring is mounted on the outside of the ultrafiltration membrane wire, and the vibration ring and the mounting sleeve are connected by an elastic member; at least one magnet block is embedded in the vibration ring, and the electromagnet is mounted on the outer wall of the membrane shell. The magnetic poles on the electromagnet can change alternately, that is, the electromagnet and the magnet block switch between an attractive state and a repulsive state, driving the vibration ring to drive the ultrafiltration membrane wire to vibrate.

2. An ultrafiltration membrane assembly according to claim 1, characterized in that: The vibration ring comprises an outer ring, an inner ring and a connecting rod. The outer ring is sleeved on the outer side of the ultrafiltration membrane wire, and the inner ring is placed on the inner side of the ultrafiltration membrane wire.

3. An ultrafiltration membrane assembly according to claim 1, characterized in that: The electromagnet is fixed on the outer wall of the membrane shell through an electromagnet mounting seat. The electromagnet is connected to alternating current through a wire, and the magnetic poles on the electromagnet change periodically with the alternating current.

4. An ultrafiltration membrane assembly according to claim 1, characterized in that: Two magnet blocks are embedded in the vibration ring, and the circumferential angle between the two magnet blocks is 45 degrees to 135 degrees.

5. An ultrafiltration membrane assembly according to claim 1, characterized in that: The vibration ring is connected to the mounting sleeve via a spring or an elastic rope.

6. An ultrafiltration membrane assembly according to claim 1, characterized in that: The installation sleeve is interference fit with the inner wall of the membrane shell and is fixed in the middle of the inner wall of the membrane shell.

7. An ultrafiltration membrane assembly according to claim 1, characterized in that: The end cover is provided with a water outlet, which is connected to the water outlet hole inside the ultrafiltration membrane wire; the end of the central tube is a water inlet, and the end of the membrane shell extends from the middle of the water outlet; the side of the end cover is provided with a flushing outlet.

8. A method for cleaning an ultrafiltration membrane assembly according to any one of claims 1 to 7, characterized in that: During the flushing stage, the electromagnet is energized and its magnetic pole changes periodically, attracting or repelling the magnet block, driving the vibration ring to swing back and forth toward or away from the electromagnet. During the swinging process, the vibration ring contacts the ultrafiltration membrane wire and drives the ultrafiltration membrane wire to vibrate. The dirt attached to the surface of the ultrafiltration membrane wire is detached by the cooperation of vibration and flushing water, thus completing the cleaning of the ultrafiltration membrane wire.

9. The cleaning method according to claim 8, characterized in that: The multiple electromagnets on the outer side of the membrane shell can be energized alternately to drive the vibration ring to swing in different directions, thereby driving all the ultrafiltration membrane wires to vibrate.

10. The cleaning method according to claim 8, characterized in that: During the flushing process, the water outlet is closed, the raw water enters the ultrafiltration membrane group from the central tube, and rushes to the ultrafiltration membrane fibers through the water inlet holes on the central tube, flushing the membrane fibers from the inside to the outside, and the waste water after flushing flows out through the flushing outlet.

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