Hollow fiber membrane module with anti-pollution function

Abstract

The invention discloses a hollow fiber membrane module with an anti-pollution function, the anti-pollution hollow fiber membrane module comprises a lower fixed end and an aeration pipe with specific structures, and particularly comprises a sealant layer with an upper surface in a specific shape and a sub-aeration pipe with an upper opening (also called as an aeration hole) in a specific shape; the upper surface of the sealing glue layer is high in the middle and low in the two sides in the extending direction of the sealing glue layer, the upper opening of each sub-aeration pipe is provided with the two ends with different heights, and the outer side of each sub-aeration pipe is lower, so that pollutants are not prone to accumulation on the upper surface of the lower fixing end and the hollow fiber membrane filaments through cooperation of the two ends, and the pollutants fall off outwards more easily; therefore, the pollution resistance of the membrane component is improved.

Description

[0001] This invention is a divisional application of the Chinese invention patent application with application date of December 30, 2020, application number 2020116096476, and name “A kind of anti-pollution hollow fiber membrane component”. Technical Field

[0002] The invention belongs to the technical field of separation membrane preparation, and in particular relates to a hollow fiber membrane component with anti-pollution function. Background Art

[0003] With the rapid development of society, water pollution is becoming increasingly serious. People are paying more and more attention to the prevention and control of water pollution, and the requirements for treatment are getting higher and higher. Membrane separation technology has the advantages of high water quality, no phase change, and high degree of automation. It is a very important wastewater treatment technology in the current water treatment field. The core of membrane separation technology is the membrane assembly. Hollow fiber membrane assemblies are widely used due to their high packing density and large specific surface area. Membrane pollution is one of the most important problems in membrane separation technology at present, but traditional membrane assemblies have the disadvantage that sludge and other pollutants are easily accumulated at the bottom of the hollow fiber membrane filaments. Therefore, the membrane filaments are polluted at a faster rate, that is, the membrane assembly has poor anti-pollution performance. Therefore, there is an urgent need for a membrane assembly that is not easy to accumulate sludge at the bottom of the membrane assembly, and the membrane filaments are polluted at a slower rate, that is, a membrane assembly with high anti-pollution performance. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an improved anti-pollution hollow fiber membrane component, which is not prone to accumulation of pollutants such as sludge and has strong anti-pollution properties.

[0005] The inventors of the present invention have found that the upper surface of the lower fixed end of the existing hollow fiber membrane assembly is generally a plane parallel to the horizontal plane, and the membrane assembly is aerated from the outside of the membrane assembly, or the aeration holes are vertically upward to aerate the membrane assembly, and the aeration holes are circular. This aeration structure has a relatively small cleaning force on the surface of the hollow fiber membrane filaments and the upper surface of the lower fixed end. Moreover, since there are many hollow fiber membrane filaments cast together in the hollow fiber membrane assembly, sludge and other pollutants are easily accumulated between the membrane filaments and the membrane curtains of the traditional membrane assembly. Since the upper surface of the lower fixed end is a plane parallel to the horizontal plane, the pollutants are not easy to fall off from the membrane assembly to the outside of the membrane assembly, so that the pollutants are quickly accumulated at the bottom of the hollow fiber membrane filaments, and then the pollutant concentration of the sewage in the membrane assembly is gradually increased, thereby accelerating the pollution rate of the hollow fiber membrane filaments, and rapidly reducing the filtration performance of the membrane assembly, that is, the traditional membrane assembly has poor anti-pollution performance. Furthermore, based on this, the present invention provides an improved anti-pollution hollow fiber membrane assembly, the upper surface of the lower fixed end of the anti-pollution hollow fiber membrane assembly is high in the middle and low on both sides, and an aeration pipe opening is designed with a specific orientation, so that pollutants such as sludge can be more easily removed, effectively solving the above-mentioned technical problems.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A pollution-resistant hollow fiber membrane assembly, the hollow fiber membrane assembly comprising an upper fixed end, a lower fixed end, an aeration main pipe, an aeration branch pipe, a water production pipe, a membrane assembly joint, and at least two curtains of hollow fiber membrane curtains respectively arranged between the upper fixed end and the lower fixed end, the at least two curtains of hollow fiber membrane curtains are arranged in parallel with each other, the hollow fiber membrane curtain is composed of a plurality of hollow fiber membrane filaments, the upper end of the hollow fiber membrane curtain is fixed to the upper fixed end, the lower end of the hollow fiber membrane curtain is fixed to the lower fixed end, the lower fixed end comprises a lower fixed end shell formed with a receiving cavity, a sealing layer filled in the receiving cavity of the lower fixed end shell and used for fixing the lower end of the hollow fiber membrane curtain, the extension direction of the sealing layer is parallel to the length direction of the hollow fiber membrane curtain, the aeration branch pipe is connected to the aeration main pipe, and the aeration branch pipe is arranged between any two adjacent curtains of the hollow fiber membrane curtains;

[0008] Among them, the upper surface of the sealant layer is high in the middle and low on both sides along the extension direction of the sealant layer, the aeration branch pipe includes at least one sub-aeration tube array arranged along the extension direction of the sealant layer, the sub-aeration tube array includes n sub-aeration tubes respectively inserted in the sealant layer and extending upward, the n is greater than or equal to 3, and the upper end faces of the upper openings of the sub-aeration tubes arranged on the left and right sides of the sub-aeration tube array have a first end and a second end opposite to the first end, the first end is close to the middle of the sealant layer, the second end is far away from the middle of the sealant layer, and the first end is higher than the second end.

[0009] According to some preferred aspects of the present invention, the upper end surface of the upper opening of any one of the sub-aeration tubes is parallel to the position plane of the upper surface of the sealant layer extending therefrom.

[0010] In the present invention, the "position plane" mentioned refers to a local plane in the upper surface corresponding to when the sub-aeration pipe passes through the sealant layer.

[0011] According to some preferred aspects of the present invention, the sub-aeration pipes extend in a vertical direction.

[0012] According to some preferred aspects of the present invention, the upper surface of the sealant layer is a continuous curved surface.

[0013] According to some preferred aspects of the present invention, the bottom of the interior of the accommodating cavity is high in the middle and low on both sides. Further, the bottom of the interior of the accommodating cavity is a smooth curved surface with a high middle and low on both sides.

[0014] According to some preferred aspects of the present invention, the upper edge of the accommodating cavity is high in the middle and low on both sides. Further, the upper edge of the accommodating cavity is a smooth curve that is high in the middle and low on both sides.

[0015] According to some preferred aspects of the present invention, the hollow fiber membrane assembly further comprises a smooth membrane layer formed on the upper surface of the sealant layer, and the extension shape of the smooth membrane layer is the same as that of the upper surface of the sealant layer.

[0016] According to some preferred aspects of the present invention, the upper opening of the sub-aeration pipe is elliptical.

[0017] According to some preferred aspects of the present invention, in the sub-aeration tube array, the size of the upper opening of each sub-aeration tube is the same, or the size of the upper opening of each sub-aeration tube gradually decreases or increases from the middle to the left and right sides, and the size is the length of the upper opening or the width of the upper opening.

[0018] According to some preferred aspects of the present invention, the cross section of the lower fixing end is circular or rectangular.

[0019] According to some preferred aspects of the present invention, the hollow fiber membrane curtains have three or more curtains, and the width of each curtain of the hollow fiber membrane curtains is the same.

[0020] According to some preferred aspects of the present invention, the hollow fiber membrane curtains have more than three curtains, and the width of each hollow fiber membrane curtain gradually decreases from the middle to the front and rear sides.

[0021] In the present invention, the extending direction of the membrane curtain width of the hollow fiber membrane membrane curtain corresponds to the width direction of the membrane module, and the length direction of the hollow fiber membrane membrane curtain corresponds to the length direction of the membrane module.

[0022] In the present invention, left, right, front and back are based on the membrane assembly as a reference, the left-right direction corresponds to the length direction of the membrane assembly, and the front-back direction corresponds to the width direction of the membrane assembly.

[0023] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0024] Based on the problem of poor pollution resistance of membrane components in the prior art, the present invention innovatively provides a lower fixed end head and an aeration tube with a specific structure, specifically a sealant layer with an upper surface of a specific shape and a sub-aeration tube with an upper opening (also called aeration hole) of a specific shape. Furthermore, the upper surface of the sealant layer of the present invention is high in the middle and low on both sides along the extension direction of the sealant layer, and the upper opening of the sub-aeration tube has two ends of different heights and the outer side is lower. The two are coordinated to make it difficult for pollutants to accumulate on the upper surface of the lower fixed end head and the hollow fiber membrane filaments, and are more likely to fall off outward, thereby improving the pollution resistance of the membrane component. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 It is a top cross-sectional schematic diagram of an anti-pollution hollow fiber membrane assembly according to an embodiment of the present invention;

[0027] Figure 2 AA cross-sectional view of an anti-pollution hollow fiber membrane assembly according to an embodiment of the present invention;

[0028] Figure 3 BB is a schematic cross-sectional view of an anti-pollution hollow fiber membrane assembly according to an embodiment of the present invention;

[0029] Figure 4 For attachment Figure 3 An enlarged schematic diagram of a local C;

[0030] In the above figures: 1, hollow fiber membrane; 2, upper fixed end; 31, lower fixed end; 32, upper surface of the sealant layer; 33, sub-aeration pipe; 34, upper opening of the sub-aeration pipe; 41, aeration main pipe; 42, water production pipe; 43, membrane assembly joint. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0032] In the description of the present invention, “plurality” means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0036] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0037] like Figure 1-4 As shown, this example provides an anti-pollution hollow fiber membrane assembly, which includes an upper fixed end 2, a lower fixed end 31, an aeration main pipe 41, an aeration branch pipe, a water production pipe 42, a membrane assembly joint 43, and at least two curtains of hollow fiber membrane curtains respectively arranged between the upper fixed end 2 and the lower fixed end 31.

[0038] Among them, the at least two curtains of hollow fiber membrane curtains are arranged parallel to each other, the hollow fiber membrane curtain is composed of multiple hollow fiber membrane filaments 1, the upper end of the hollow fiber membrane curtain is fixed on the upper fixed end head 2, and the lower end of the hollow fiber membrane curtain is fixed on the lower fixed end head 31, the lower fixed end head 31 includes a lower fixed end shell with a receiving cavity, a sealing layer filled in the receiving cavity of the lower fixed end shell and used to fix the lower end of the hollow fiber membrane curtain, the extension direction of the sealing layer is parallel to the length direction of the hollow fiber membrane curtain, the aeration branch pipe is connected to the aeration main pipe 41, and an aeration branch pipe is provided between any two adjacent curtains of hollow fiber membrane curtains;

[0039] The upper surface 32 of the sealant layer is higher in the middle and lower on both sides along the extension direction of the sealant layer. The aeration branch pipe includes at least one sub-aeration tube array arranged along the extension direction of the sealant layer. The sub-aeration tube array includes n sub-aeration tubes 33 respectively inserted in the sealant layer and extending upward, n is greater than or equal to 3, and the upper end faces of the upper openings of the sub-aeration tubes 33 arranged on the left and right sides of the sub-aeration tube array have a first end and a second end opposite to the first end, the first end is close to the middle of the sealant layer, the second end is far away from the middle of the sealant layer, and the first end is higher than the second end.

[0040] Specifically, in this example, Figure 1-2 As shown, the membrane assembly in this example is provided with two vertical curtains of hollow fiber membrane arranged in parallel, the upper end of which is cast in the upper fixed end head 2 and the lower end of which is cast in the lower fixed end head 31 .

[0041] In this example, the water production pipe 42 is bonded to the upper fixed end head 2 (the upper fixed end head 2 includes an upper fixed end shell and a bonding layer formed by an adhesive sealant, and the water production pipe 42 is bonded and fixed by the adhesive sealant). The water production pipe 42 is connected to the interior of the hollow fiber membrane 1 and is connected to the membrane assembly joint 43. It can be connected to a membrane assembly device such as a membrane frame through the membrane assembly joint 43. The water filtered by the membrane assembly in this example can be discharged outward through the water production pipe 42.

[0042] In this example, if Figure 1 As shown, the aeration main pipe 41 is arranged near the joint of one side membrane assembly and bonded to the lower fixed end 31, and is connected to the sub-aeration pipe 33, and then the membrane assembly is aerated through the sub-aeration pipe 33. The aeration main pipe 41 is connected to other external aeration devices.

[0043] Specifically, the “position plane” mentioned in this example refers to a local plane in the upper surface corresponding to when the sub-aeration pipe 33 passes through the sealant layer, and the sub-aeration pipe 33 extends in the vertical direction.

[0044] Furthermore, the cross section of the lower fixing end 31 is rectangular, and in this example, the upper surface 32 of the sealant layer is a continuous curved surface that is high in the middle and gradually decreases toward both sides.

[0045] In this example, the hollow fiber membrane assembly also includes a smooth membrane layer formed on the upper surface 32 of the sealant layer. The extended shape of the smooth membrane layer is the same as the upper surface 32 of the sealant layer. The thickness of the smooth membrane layer can be very thin, and the smooth function can be achieved. In this way, the upper surface 32 of the sealant layer can be a smooth curved surface to ensure the smooth discharge of pollutants such as sludge, while not affecting the sludge discharge effect.

[0046] Furthermore, in this example, the n sub-aeration tubes 33 in the sub-aeration tube array are cylindrical and arranged in parallel and inserted in the sealant layer, the lower ends are connected to the aeration main pipe 41, and the upper openings at the upper ends are inclined, specifically inclined toward the outside. The upper openings 34 of the sub-aeration tubes can be elliptical, and at the same time, the upper end surface of the upper opening 34 of any sub-aeration tube is parallel to the position plane of the upper surface 32 of the sealant layer extending from it, thereby ensuring an excellent sludge discharge effect.

[0047] Specifically, in the sub-aeration tube array, the upper openings 34 of each sub-aeration tube have the same size, or the size of the upper openings 34 of each sub-aeration tube gradually decreases or increases from the middle to the left and right sides. In this example, the upper openings 34 of the sub-aeration tubes have substantially the same size.

[0048] In this example, the bottom of the accommodating cavity is high in the middle and low on both sides and is a smooth curved surface. At the same time, the upper edge of the accommodating cavity is also high in the middle and low on both sides and is a smooth curve, which can more conveniently form the above-mentioned specific shape of the sealant layer.

[0049] Specifically, the membrane assembly in this example can be prepared by the following method, but is not limited to the following method. The following method is only illustrative, and the parts not mentioned are respectively carried out according to conventional methods in the prior art:

[0050] 1) First, the hollow fiber membrane 1 is divided into two curtains of hollow fiber membrane curtains, and the upper end of the hollow fiber membrane curtain is cast in the upper fixed end 2. Then, the upper end of the upper fixed end 2 is cut off, and the upper fixed end 2 is bonded to the water production pipe 42, so that the upper end of the hollow fiber membrane 1 is connected to the water production pipe 42.

[0051] 2) Arrange the lower ends of the two curtains of hollow fiber membranes in the receiving cavity of the lower fixed end shell of the lower fixed end head 31, arrange each sub-aeration tube 33 in the receiving cavity of the lower fixed end shell and in the middle of the two curtains of hollow fiber membranes (or directly make each sub-aeration tube 33 and the lower fixed end shell integrally formed), gradually add the high-viscosity and fast-curing sealant A from the middle position of the receiving cavity of the lower fixed end shell, and naturally cast it into a curved surface with the upper surface being high in the middle and gradually decreasing to both sides, so that the upper surface of the sealant A is about 1-10mm lower than the upper edge of the receiving cavity, preferably 5mm. After the high-viscosity and fast-curing sealant A is completely solidified, the hollow fiber membrane filament 1 is firmly cast in the receiving cavity of the lower fixed end shell. Then, a sealant B with a smooth surface and low viscosity is gradually added into the accommodating cavity of the lower fixed end shell from the middle position of the accommodating cavity, so that it naturally flows on the surface of the cured sealant A, so that the upper surface of the sealant B is almost flush with the upper edge of the accommodating cavity of the lower fixed end shell. After the sealant B is completely cured, the upper surface 32 of the sealant layer with a smooth surface becomes a smooth curved surface that is high in the middle and gradually decreases toward both sides.

[0052] In this step, since the bottom of the interior of the accommodating cavity of this example is a smooth curved surface with a high middle and low sides, and the upper edge of the accommodating cavity is also a smooth curved surface with a high middle and low sides, when the membrane filament is cast into the lower fixed end shell of the lower fixed end head 31, a sealant A with high viscosity and fast curing speed is poured from the middle of the accommodating cavity of the lower fixed end shell to make it naturally cast into a curved surface with a high middle and gradually lowered to the left and right sides of the membrane assembly, and the membrane filament is firmly fixed in the lower fixed end head. Then, a small amount of low-viscosity sealant B with good fluidity is poured from the middle of the accommodating cavity of the lower fixed end shell to make it naturally cast to form a very smooth curved surface. Therefore, when the membrane filament is cast into the lower fixed end head, a smooth curved surface with a high middle and gradually lowered to the left and right sides can be directly obtained, without the need for additional processing technology, the preparation method is simple, and the production cost is low. In addition, the smooth curved surface formed by the low-viscosity sealant B can reduce the friction force on the hollow fiber membrane filament 1, thereby reducing the probability of damage to the membrane filament during use.

[0053] When the sealant B is not used, the upper surface of the sealant A can be directly made almost flush with the upper edge of the accommodating cavity of the lower fixed end shell;

[0054] 3) Bond the lower fixed end 31 and the aeration main pipe 41 together, so that the sub-aeration pipe 33 is connected to the aeration main pipe 41.

[0055] 4) The four membrane module joints 43 are bonded together with the left and right ends of the water production pipe 42 and the aeration main pipe 41 respectively, and a complete anti-pollution hollow fiber membrane module is manufactured.

[0056] In this example, the water produced by the membrane module enters the water production pipe 42 through the interior of the hollow fiber membrane 1, and then is discharged to the water production pipe outside the membrane module through the membrane module joint 43.

[0057] In this example, the airflow enters the aeration main pipe 41 through the membrane module joint 43, then enters the sub-aeration pipe 33 inserted in the sealant layer of the lower fixed end 31, and finally is exposed through the upper opening 34 of the inclined elliptical sub-aeration pipe parallel to the corresponding position plane on the upper surface 32 of the sealant layer.

[0058] In summary, the anti-pollution hollow fiber membrane assembly of the present invention has the following effects:

[0059] 1) Since the upper surface 32 of the sealant layer of the lower fixed end head 31 is a smooth curved surface that is high in the middle and gradually decreases toward the left and right sides, and since pollutants have less adhesion to the smooth surface and are easy to slide from a high position to a low position, when the membrane assembly is aerated, under the impact of bubbles, pollutants are more likely to gradually slide from the smooth upper surface 32 of the sealant layer of the lower fixed end head 31 to the outside of the membrane assembly, making it difficult for pollutants to accumulate on the upper surface 32 of the sealant layer of the lower fixed end head 31, thereby keeping the bottom of the hollow fiber membrane filament 1 of the membrane assembly in a relatively clean state for a long time, thereby reducing the pollution rate of the hollow fiber membrane filament 1, that is, improving the anti-pollution property of the membrane assembly.

[0060] 2) Since the upper opening 34 of the sub-aeration tube (hereinafter also referred to as aeration hole) is parallel to the position plane of the upper surface 32 of the sealant layer extending from it, that is, the upper opening 34 of the sub-aeration tube is inclined to the left and right outer sides of the membrane assembly, when the bubbles burst out from the aeration holes, a strong shear force tending to the left and right outer sides of the membrane assembly is generated on the bottom of the hollow fiber membrane filaments, and an impact force tending to the left and right outer sides of the membrane assembly is generated on the upper surface 32 of the sealant layer of the lower fixed end 31, thereby making it easier for pollutants to fall off from the surface of the hollow fiber membrane filaments 1 and the upper surface 32 of the sealant layer of the lower fixed end 31, and under the impact force of the bubbles tending to the left and right outer sides of the membrane assembly, they are removed outside the membrane assembly and are not easily accumulated at the bottom of the membrane filaments, thereby reducing the pollution rate of the membrane filaments and improving the pollution resistance of the membrane assembly.

[0061] 3) Since the shear force exerted by the bubbles bursting from the inclined aeration holes on the hollow fiber membrane 1 is inclined upward, the cleaning force on the hollow fiber membrane 1 is greater than the vertically upward shear force, making it easier for pollutants to fall off the hollow fiber membrane 1 and keep the fallen pollutants away from the hollow fiber membrane 1, thereby improving the anti-pollution property of the membrane assembly.

[0062] 4) Since the bubbles bursting from the inclined aeration holes generate a larger inclined shear force on the bottom of the hollow fiber membrane 1, the shaking amplitude of the hollow fiber membrane 1 is larger than when it is subjected to a vertical upward shear force, and pollutants are more easily removed from the surface of the hollow fiber membrane 1. Therefore, the inclined aeration holes have a greater cleaning effect on the entire hollow fiber membrane 1.

[0063] 5) Since the aeration hole is an inclined ellipse, the major axis and minor axis sizes of the aeration hole can be adjusted by adjusting the inclination angle of the aeration hole, so that the newly exposed bubbles with a size larger than the distance between the two curtains of hollow fiber membrane fibers can be obtained while saving the floor space of the membrane assembly. Due to the effect of surface tension, the elliptical bubbles just exposed from the elliptical aeration hole quickly shrink in the major axis direction of the aeration hole, but expand in the minor axis direction, and quickly explode after touching the bottom of the hollow fiber membrane fiber 1, thereby generating a greater shear force on the bottom of the hollow fiber membrane fiber 1, thereby having a greater cleaning force on the hollow fiber membrane fiber 1, so that the pollution rate of the hollow fiber membrane fiber 1 is lower, that is, the membrane assembly has a higher anti-pollution property.

[0064] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A hollow fiber membrane module, characterized in that: The hollow fiber membrane assembly comprises an aeration main pipe, an aeration branch pipe, a lower fixed end, and at least two hollow fiber membrane curtains; The lower end of the hollow fiber membrane curtain is fixed to the lower fixed end head, and the lower fixed end head includes a lower fixed end shell formed with a receiving cavity, and a sealant layer filled in the receiving cavity of the lower fixed end shell and used to fix the lower end of the hollow fiber membrane curtain, and the extension direction of the sealant layer is parallel to the length direction of the hollow fiber membrane curtain, the aeration branch pipe is connected to the aeration main pipe, and the aeration branch pipe is provided between any two adjacent hollow fiber membrane curtains; The upper surface of the sealant layer is higher in the middle and lower on both sides along the extension direction of the sealant layer. The aeration branch pipe includes at least one sub-aeration tube array arranged along the extension direction of the sealant layer. The sub-aeration tube array includes n sub-aeration tubes respectively inserted in the sealant layer and extending upward, wherein n is greater than or equal to 3. The upper end faces of the upper openings of the sub-aeration tubes arranged on the left and right sides of the sub-aeration tube array have a first end and a second end opposite to the first end, wherein the first end is close to the middle of the sealant layer, and the second end is far away from the middle of the sealant layer, and the first end is higher than the second end.

2. The hollow fiber membrane assembly according to claim 1, characterized in that: The size of the upper opening is greater than the distance between two adjacent curtains of hollow fiber membranes.

3. The hollow fiber membrane assembly according to claim 1 or 2, characterized in that: The upper opening is in an elliptical shape, and the size of the major axis of the ellipse is greater than the distance between two adjacent curtains of hollow fiber membranes.

4. The hollow fiber membrane assembly according to claim 1, characterized in that: The n sub-aeration tubes in the sub-aeration tube array are cylindrical and arranged in parallel and inserted in the sealant layer, and the lower ends of the sub-aeration tubes are connected to the aeration main pipe.

5. The hollow fiber membrane assembly according to claim 4, characterized in that: The sub-aeration pipe and the lower fixed end shell are integrally formed.

6. The hollow fiber membrane module according to claim 1, characterized in that: The lower fixed end is bonded to the aeration main pipe; and / or the lower end of the hollow fiber membrane curtain is cast in the lower fixed end; and / or the cross section of the lower fixed end is circular or rectangular.

7. The hollow fiber membrane module according to claim 1, characterized in that: The upper end surface of the upper opening of any one of the sub-aeration tubes is parallel to the position plane of the upper surface of the sealant layer extending from it; and / or, the hollow fiber membrane assembly also includes a smooth membrane layer formed on the upper surface of the sealant layer, and the extension shape of the smooth membrane layer is the same as the upper surface of the sealant layer. Furthermore, the thickness of the smooth membrane layer is 1-10 mm.

8. The hollow fiber membrane module according to claim 1, characterized in that: The upper surface of the sealant layer is a continuous curved surface; and / or the bottom of the interior of the accommodating cavity is higher in the middle and lower on both sides, and further, the bottom of the interior of the accommodating cavity is a smooth curved surface that is higher in the middle and lower on both sides; and / or the upper edge of the accommodating cavity is higher in the middle and lower on both sides, and further, the upper edge of the accommodating cavity is a smooth curve that is higher in the middle and lower on both sides; and / or the sub-aeration pipe extends in the vertical direction.

9. The hollow fiber membrane module according to claim 1, characterized in that: The lower end of the hollow fiber membrane curtain is arranged in the accommodating cavity of the lower fixed end shell of the lower fixed end head, and each of the sub-aeration pipes is arranged in the accommodating cavity of the lower fixed end shell and is located in the middle of two adjacent hollow fiber membrane curtains.

10. The hollow fiber membrane module according to claim 1, characterized in that: The hollow fiber membrane curtain has more than three curtains, and the width of each curtain is the same, or, the hollow fiber membrane curtain has more than three curtains, and the width of each hollow fiber membrane curtain gradually decreases from the middle to the front and rear sides; and / or, In the sub-aeration tube array, the upper openings of the sub-aeration tubes have the same size, or the upper openings of the sub-aeration tubes gradually decrease or increase from the middle to the left and right sides, and the size is the length of the upper opening or the width of the upper opening.

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