External pressure hollow fiber membrane assembly and filtration device

Abstract

The present invention relates to an external pressure type hollow fiber membrane assembly and a filtering device. An external pressure type hollow fiber membrane assembly comprises: a shell having an inner cavity; and two end head parts, respectively provided at the two ends of the inner cavity of the shell; the end head parts are provided with a plurality of gap channels penetrating the end head parts along the axial direction of the shell and a plurality of water collection channels that are interconnected; the gap channels and the water collection channels are alternately arranged. In the above-mentioned external pressure type hollow fiber membrane assembly, gap channels are provided on both end head parts, so that raw water or aeration can be smoothly discharged from the inner cavity of the shell. Thereby, pollutants outside the hollow fiber membrane filaments can be conveniently flowed out from the gap channels, avoiding excessive accumulation of pollutants at the roots of the hollow fiber membrane filaments. Thereby, while the filtration efficiency of the external pressure type hollow fiber membrane assembly can be guaranteed, the filtration energy consumption of the external pressure type hollow fiber membrane assembly is reduced.

Description

Technical Field

[0001] The present invention relates to the field of membrane filtration and separation, in particular to an external pressure type hollow fiber membrane component and a filtration device. Background Art

[0002] Membrane separation technology has been widely used in fields such as water purification and liquid filtration and separation. Hollow fiber membrane modules are generally categorized into internal pressure and external pressure types based on the filtration direction. External pressure hollow fiber membrane modules operate by allowing raw water to enter the pressure housing and pass through the hollow fiber membranes to the inner cavity of the hollow fiber membranes, forming a filtrate. Contaminants are retained on the outside of the hollow fiber membranes. Therefore, external pressure hollow fiber membrane modules can be used for raw water containing higher concentrations of contaminants.

[0003] However, when using an external pressure hollow fiber membrane module to filter raw water containing high concentrations of pollutants, pollutants trapped outside the hollow fiber membranes tend to accumulate at the base of the membranes. This increases the filtration energy consumption of the external pressure hollow fiber membrane module to maintain the water output. In severe cases, the filtration efficiency of the module can even be reduced. Summary of the Invention

[0004] Based on this, it is necessary to provide an external pressure hollow fiber membrane assembly that can effectively improve the accumulation of pollutants at the root of the hollow fiber membrane

[0005] An external pressure type hollow fiber membrane module, comprising:

[0006] a housing having an interior cavity; and

[0007] Two end components are respectively arranged at the two ends of the shell cavity; the end components are provided with a plurality of gap channels penetrating the end components along the axial direction of the shell and a plurality of water collection channels connected to each other; the gap channels and the water collection channels are alternately arranged.

[0008] The external pressure hollow fiber membrane module features two end components with interstitial channels, allowing raw water or aeration to drain smoothly from the housing's interior. This allows contaminants outside the hollow fiber membranes to flow easily through the interstitial channels, preventing excessive accumulation of contaminants at the base of the hollow fiber membranes. This reduces the module's filtration energy consumption while maintaining its filtration efficiency.

[0009] In one embodiment, the extension direction of the gap channel is a straight line perpendicular to the axial direction of the shell, and a plurality of the gap channels are parallel to each other.

[0010] In one embodiment, it further comprises a plurality of hollow fiber membrane bundles disposed in the inner cavity of the shell; the width of the hollow fiber membrane bundle is less than or equal to 60 mm.

[0011] In one embodiment, the ratio of the width of the water collection channel to the width of the gap channel is less than 6.

[0012] In one embodiment, it further comprises a plurality of hollow fiber membrane bundles arranged in the inner cavity of the shell; in the axial direction perpendicular to the shell, the cross section of the hollow fiber membrane bundle is circular and the outer diameter is less than 60 mm.

[0013] In one embodiment, the cross section of the gap channel is fan-shaped or fan-shaped in a direction perpendicular to the axial direction of the shell.

[0014] In one embodiment, along the axial direction of the shell, the cross-sectional area of the gap channel perpendicular to the axial direction of the shell gradually decreases from outside to inside.

[0015] In one embodiment, the invention further comprises a first end cover sealedly connected to one end of the shell, and a pulse aerator is provided on a side of the first end cover close to the inner cavity of the shell.

[0016] In one embodiment, the pulse aerator has an airflow release hole close to the end component, and the airflow release hole is coaxial with the pulse aerator.

[0017] The present invention also provides a filtering device, which includes the external pressure type hollow fiber membrane component provided by the present invention.

[0018] The filter device features two end components with interstitial channels, allowing raw water or aeration to drain smoothly from the housing's interior. This allows contaminants outside the hollow fiber membranes to flow easily through the interstitial channels, preventing excessive accumulation of contaminants at the base of the hollow fiber membranes. This reduces the filtration energy consumption of the external pressure hollow fiber membrane module while maintaining its filtration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of an external pressure hollow fiber membrane module provided in one embodiment of the present invention.

[0020] Figure 2 for Figure 1 Schematic diagram of part of the structure of the internal and external pressure hollow fiber membrane module.

[0021] Figure 3 for Figure 1 A cross-sectional view of the end head component in FIG.

[0022] Figure 4 for Figure 1 Schematic diagram of the structure of the pulse aerator.

[0023] Figure 5 A cross-sectional view of an end member of an external pressure type hollow fiber membrane module according to another embodiment of the present invention.

[0024] Figure 6 This is a schematic structural diagram of an external pressure hollow fiber membrane module provided in another embodiment of the present invention. DETAILED DESCRIPTION

[0025] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] It should be noted that when an element is referred to as being “fixed to” another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or there may be an intermediate element.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] like Figures 1 to 4 As shown, an external pressure type hollow fiber membrane module 100 provided by one embodiment of the present invention includes a shell 110 having an inner cavity 111 and an end head component 130 .

[0029] Specifically, the end component 130 is provided at one end of the inner cavity 111 of the shell 110. The end component 130 is provided with a plurality of gap channels 131 penetrating the end component 130 along the axial direction of the shell 110 and a plurality of water collection channels 133 communicating with each other. The gap channels 131 and the water collection channels 133 are alternately arranged. Figure 1 Indicated by the dotted line.

[0030] It is understandable that the gap channel 131 is used to discharge pollutants outside the hollow fiber membrane filaments, so the width of the gap channel 131 needs to be able to discharge pollutants outside the hollow fiber membrane filaments.

[0031] It should be noted that the number of the void channels 131 being several means that the number of the void channels 131 is at least two. The number of the water collection channels 133 being several means that the number of the water collection channels 133 is also at least two.

[0032] In the external pressure hollow fiber membrane module 100, both end components 130 are provided with a void channel 131, so that the raw water or aeration is input or discharged from both ends of the inner cavity 111 during the process from entering the inner cavity 111 of the shell 110 to being discharged from the inner cavity 111 of the shell 110. In this way, the raw water or aeration is prevented from being forcibly changed in its flow direction during the process of entering the inner cavity 111 of the shell 110 or being discharged from the inner cavity 111 of the shell 110, so that the raw water or aeration can be smoothly discharged from the inner cavity of the shell. The void channel 131 can facilitate the outflow of pollutants outside the hollow fiber membrane and prevent excessive accumulation of pollutants at the root of the hollow fiber membrane, thereby reducing the filtration energy consumption of the external pressure hollow fiber membrane module 100 while ensuring the filtration efficiency of the external pressure hollow fiber membrane module 100.

[0033] In this embodiment, the interstitial channels 131 of the two end components 130 are arranged in an opposed manner. In other words, the projections of the interstitial channels 131 of the two end components 130 overlap in a plane perpendicular to the axial direction of the housing 110. This allows for smoother input and output of raw water and aeration. Of course, in other feasible embodiments, the interstitial channels 131 of the two end components 130 may not be arranged in an entirely aligned manner.

[0034] It is understood that the inner lumen of the hollow fiber membranes is connected to the water collection channels 133. The interstitial channels 131 and the water collection channels 133 are arranged alternately, i.e., a plurality of water collection channels 133 are arranged in pairs. Furthermore, each water collection channel 133 corresponds to a different hollow fiber membrane bundle. Therefore, the hollow fiber membrane bundle corresponding to each water collection channel 133 is independently arranged.

[0035] In this embodiment, at least two void channels 131 are provided on the end component 130, and the void channels 131 are spaced apart from the water collection channels 133, thereby increasing the exposed area of the hollow fiber membrane bundle. When the raw water enters the inner cavity 111 of the shell 110, or when the aeration gas enters the inner cavity 111 of the shell 110, it can contact the hollow fiber membrane filaments with a larger area, thereby flushing away more pollutants on the hollow fiber membrane filaments.

[0036] In addition, in this embodiment, the exposed area of the hollow fiber membrane bundle is increased, and the thickness of the pollutants attached to the outer surface of the hollow fiber membrane bundle is reduced, so that the impact of the pollutant attachment on the filtration efficiency of the hollow fiber membrane bundle is relatively low, and the pollutants on the surface of the hollow fiber membrane bundle are easy to clean, saving the cleaning time of the external pressure type hollow fiber membrane assembly 100, and thus improving the filtration efficiency of the external pressure type hollow fiber membrane assembly 100.

[0037] Optionally, the end member 130 is made of plastic, rubber, stainless steel or resin. When the end member is formed of resin material, the end member 130 is cast and simultaneously cast together with the inner wall of the housing 110 and the hollow fiber membrane, and the end opening of the hollow fiber membrane is kept unobstructed.

[0038] In this embodiment, the external pressure hollow fiber membrane module 100 further includes a water collection pipe 150 in communication with the water collection channel 133. At least a portion of the filtrate in the hollow fiber membrane lumen flows into the water collection channel 133 and then drains into the water collection central pipe 150 in communication with the water collection channel 133, where the filtrate is discharged.

[0039] It is understood that the end component 130 must be provided with a structure that connects to the water collection pipe 150 so that the water collection pipe 150 communicates with the water collection channel 133. Specifically, in this embodiment, the end component 130 is provided with a water collection pipe interface 135 that communicates with the water collection channel 133 and mates with the water collection pipe 150. Along the axial direction of the housing 110, the axis of the water collection pipe interface 135 is collinear with the axis of the end component 130. Of course, in other feasible embodiments, the axis of the water collection pipe interface along the axial direction of the housing can also deviate from the axis of the end component.

[0040] In this embodiment, the end component 130 and the housing 110 are detachably assembled through the clamp 120. Of course, in other feasible embodiments, the end component 130 and the housing 110 can also be assembled and connected by bonding or other methods.

[0041] In this embodiment, both end components 130 are provided with water collection channels 133, allowing the filtrate in the hollow fiber membrane lumens to flow smoothly into the water collection channels 133, facilitating the discharge of the filtrate. Specifically, during use, the two end components 130 generally have a height difference in a direction perpendicular to the horizontal plane. Therefore, under the action of gravity, the filtrate in the hollow fiber membrane lumens can flow smoothly into the water collection channels 133 of the lower end component 130. Of course, when the water pressure of the raw water is higher than the water pressure of the purified water in the water collection channels 133 of the upper end component 130, it is also convenient for the filtrate in the hollow fiber membrane lumens to be discharged smoothly into the water collection channels 133 of the upper end component 130. That is, the filtrate in the hollow fiber membrane lumens can be discharged from both ends simultaneously, thereby increasing the discharge rate of the filtrate in the hollow fiber membrane lumens, thereby improving the filtration efficiency of the external pressure hollow fiber membrane module 100.

[0042] In this embodiment, the extension direction of the void channel 131 is a straight line perpendicular to the axial direction of the housing 110, and the plurality of void channels 131 are parallel to each other. In this embodiment, the extension direction of the void channel 131, that is, the direction of the surface where the void channel 131 connects with the water collecting channel 133, is shown in FIG. Figure 2 mm in the direction of the

[0043] Accordingly, the extension direction of the water collection channel 133 is the same as that of the void channel. The structure of the hollow fiber membrane bundle is also arranged corresponding to the structure of the water collection channel 133, that is, the structure of the hollow fiber membrane bundle also extends along a straight line.

[0044] Gap channels 131 are provided on both sides of the water collection channel 133, thereby preventing local accumulation of pollutants in the hollow fiber membrane bundle and evenly cleaning the hollow fiber membrane bundle to prevent pollutants locally attached to the hollow fiber membrane from being unable to be cleaned.

[0045] In this embodiment, the external pressure hollow fiber membrane module 100 further includes a plurality of hollow fiber membrane bundles 170 disposed within the inner cavity 111 of the housing 110. The width d of the hollow fiber membrane bundles 170 is less than or equal to 60 mm. This prevents contaminants from adhering to the surface of the hollow fiber membrane bundles 170 due to the large width of the hollow fiber membrane bundles 170.

[0046] Optionally, the ratio of the width D1 of the water collection channel 133 to the width D2 of the void channel 131 is less than 6. The width D1 of the water collection channel 133 is greater than or equal to the width d of the hollow fiber membrane bundle 170. Therefore, the ratio of the width d of the hollow fiber membrane bundle 170 to the width D2 of the void channel 131 is less than 6. This allows larger pollutants to pass smoothly through the void channel 131 and be discharged, avoiding the blockage of the void channel 131 caused by the inability of larger pollutants to be discharged, resulting in the external pressure type hollow fiber membrane assembly 100 not being able to work properly. In addition, during the aeration and cleaning process of the external pressure type hollow fiber membrane assembly, larger bubbles can also pass smoothly through the void channel 131, thereby better cleaning the dirt on the surface of the hollow fiber membrane bundle 170.

[0047] Specifically, in this embodiment, the ratio of the width of the water collection channel 133 to the width of the gap channel 131 can be 6, 5.5, 5, 4.5, 4, 3, 2, 1 or 0.5, etc.

[0048] The following describes in detail the transmembrane pressure difference during operation of the external pressure type hollow fiber membrane module 100 with different ratios of the width D1 of the water collecting channel 133 to the width D2 of the void channel 131 in Table 1.

[0049] Table 1. Transmembrane pressure difference of external pressure hollow fiber membrane modules with different ratios of the width D1 of the water collection channel 133 to the width D2 of the void channel 131 during operation

[0050]

[0051] Where D1 is the width of the water collection channel, and D2 is the width of the gap channel. Figure 3 The data in Table 1 were measured under the premise that the raw water sludge concentration was 14000 mg / L, the water flux was 30 L / ㎡.h, the water temperature was 25°C, and the size of the end component 130 remained unchanged, and the number of the water collection channels 133 and the number of the gap channels 131 remained unchanged.

[0052] In addition, if the water production flux remains unchanged, as more and more pollutants accumulate on the surface of the hollow fiber membrane bundle 170, the transmembrane pressure difference will increase. Accordingly, the equipment needs to provide greater energy consumption.

[0053] According to the data in Table 1, when the external pressure type hollow fiber membrane assembly 100 operates for the same time, the smaller the ratio of the width D1 of the water collection channel 133 to the width D2 of the void channel 131, the smaller the transmembrane pressure difference. That is, the smaller the ratio of the width D1 of the water collection channel 133 to the width D2 of the void channel 131, the fewer pollutants are attached to the outer surface of the hollow fiber membrane bundle 170. Furthermore, the smaller the ratio of the width D1 of the water collection channel 133 to the width D2 of the void channel 131, the smaller the width of the water collection channel 133, and the larger the width of the void channel 131. Therefore, the smaller the width of the hollow fiber membrane bundle 170, the larger the width of the void channel 133, the smaller the transmembrane pressure difference, and the fewer pollutants are attached to the surface of the hollow fiber membrane bundle 170.

[0054] In this embodiment, the structure and width of the void channels 131 on the end member 130 are the same. It is understood that in other feasible embodiments, the widths of the void channels can also be different. Similarly, the structure of the void channels can be different. For example, the same end member can have both rectangular and fan-shaped void channels.

[0055] In this embodiment, the external pressure hollow fiber membrane module 100 further includes a first end cap 190 sealed to one end of the housing 110. A pulse aerator 180 is provided on one side of the first end cap 190 adjacent to the inner cavity 111 of the housing 110. Compared to conventional continuous aeration methods that directly deliver airflow to the inner cavity of the housing via an air pipe, the bubbles released by the pulse aerator 180 can directly enter the inner cavity 111 of the housing 110 through the interstitial channel 131, thereby better cleaning contaminants from the surface of the hollow fiber membrane bundle 170.

[0056] Furthermore, the pulse aerator 180 discharges air in a pulsed manner. Specifically, the pulse aerator 180 continuously inputs airflow during operation. The pulse aerator 180 accumulates energy from a continuous airflow for a period of time and then aerates it instantly, forming larger bubbles. This increases the impact of the discharged airflow, thereby further and better cleaning contaminants from the surface of the hollow fiber membrane bundle 170.

[0057] In this embodiment, the pulse aerator 180 has an airflow release hole 181 near the end member 130, and the airflow release hole 181 is coaxial with the pulse aerator 180. Therefore, the pulse aerator 180 has only one airflow release hole 181, and the impact bubbles discharged from the airflow release hole 181 are larger, thereby exerting a greater impact force on the surface of the hollow fiber membrane bundle 170, thereby better cleaning the contaminants on the surface of the hollow fiber membrane bundle 170.

[0058] In this embodiment, the first end cap 190 is provided with an opening 191 for connecting the gas delivery port 183 of the pulse aerator 180 to the outside world. Of course, in other feasible embodiments, if the structure of the pulse aerator is changed, the opening can also serve as a gas delivery channel and connect to the gas delivery port of the pulse aerator.

[0059] It will be appreciated that, in this embodiment, the first end cap 190 is provided with a water flow channel 193 for delivering raw water to the inner cavity 111 of the housing 110 or for discharging concentrated water. The provision of the pulse aerator 180 does not block the communication between the water flow channel 193 and the inner cavity 111 of the housing 110, and enables the smooth delivery of raw water to the inner cavity of the housing 110 or the smooth discharge of concentrated water from the water flow channel 193.

[0060] It is understandable that, in another feasible embodiment, the structure of the void channel and the water collection channel is not limited thereto. Accordingly, the structure of the hollow fiber membrane bundle is not limited thereto. For example, in a feasible embodiment, in the axial direction perpendicular to the shell, the cross-section of the hollow fiber membrane bundle is circular, and the outer diameter is less than 60 mm to prevent more pollutants from adhering to the surface of the hollow fiber membrane bundle. Optionally, in the axial direction perpendicular to the shell, the water collection channel is circular, and the hollow fiber membrane bundle has the same structure as the water collection channel. Of course, it is understandable that, in another feasible embodiment, the structure of the hollow fiber membrane bundle is not limited to being similar to the structure of the water collection channel.

[0061] The following is a detailed description of the transmembrane pressure difference during the operation of the external pressure type hollow fiber membrane module based on Table 2.

[0062] Table 2. Transmembrane pressure difference of external pressure hollow fiber membrane modules with different structures as the operation time increases

[0063]

[0064]

[0065] It should be noted that conventional external pressure hollow fiber membrane modules have only one end member with a void channel and utilize continuous aeration. The pulsed aeration in external pressure hollow fiber membrane module 100 has been replaced with continuous aeration. Specifically, the pulsed aerator in external pressure hollow fiber membrane module 100 has been removed, and an air pipe is used to deliver an impinging airflow into the inner cavity of the housing to flush the hollow fiber membrane bundle 170.

[0066] The data in Table 2 are obtained when the raw water sludge concentration is 14000 mg / L, the water flux is 30 L / ㎡.h, and the continuous air flow is 2m 3 / h, water temperature 25℃, and the dimensions of the external pressure hollow fiber membrane modules are the same.

[0067] According to the data in Table 2: By comparing each set of data separately, such as the first set of data C1, it can be seen that: as the operation time of the external pressure hollow fiber membrane module becomes longer and longer, the transmembrane pressure difference becomes larger and larger, that is, more and more pollutants accumulate on the surface of the hollow fiber membrane bundle.

[0068] Comparing the first and second sets of data, C1 and C2, the transmembrane pressure difference of the external pressure hollow fiber membrane module is smaller when the module is operated for the same time. Therefore, after the same operation time, the surface of the hollow fiber membrane bundle in C2 contains less contaminants. This indicates that by providing the void channels 131 on both end components 130, some contaminants can be smoothly discharged during the raw water discharge process, thereby reducing the accumulation of contaminants on the surface of the hollow fiber membrane bundle.

[0069] Comparing the second and third data sets, C2, C3, the transmembrane pressure difference of the external pressure hollow fiber membrane module is smaller when the module is operated for the same time. Therefore, after the same operation time, the contaminants accumulated on the surface of the hollow fiber membrane bundle in C3 are less. This shows that when cleaning an external pressure hollow fiber membrane module, using a pulse aerator can create a greater impact on the surface of the hollow fiber membrane bundle, thereby more thoroughly cleaning the contaminants on the hollow fiber membrane bundle.

[0070] Optionally, in another feasible embodiment, in the direction perpendicular to the axial direction of the shell, the cross-section of the gap channel may also be in a regular or irregular shape such as a fan shape or a fan ring shape, as long as the pollutants can pass through the gap channel.

[0071] Furthermore, optionally, the end member is provided with at least four void channels distributed in an annular array. This prevents the width or corresponding central angle of the water collection channel between two void channels from being too large, i.e., prevents the width or corresponding central angle of the hollow fiber membrane bundle corresponding to the water collection channel from being too large, thereby preventing a large amount of contaminants from being deposited on the outer surface of the hollow fiber membrane bundle.

[0072] Specifically, if Figure 5 As shown, in another embodiment of the external pressure hollow fiber membrane module provided by the present invention, the cross-section of the interstitial channel 231 is fan-shaped in a direction perpendicular to the axial direction of the shell. The end member 230 is provided with six interstitial channels 231 distributed in an annular array, and the width D1 of the water collection channel 233 is less than 60 mm.

[0073] Specifically, in this embodiment, the outer diameter of the shell is 9 inches, and the central angle a of the gap channel is 60 degrees. In the direction perpendicular to the axial direction of the shell, the water collection channel 233 is rectangular.

[0074] Table 3. Transmembrane pressure difference of the external pressure type hollow fiber membrane module corresponding to the water collection channel 233 of different widths D1 as the operation time increases

[0075]

[0076]

[0077] The data in Table 3 show that, for the same operating time of the external pressure hollow fiber membrane module, the smaller the width D1 of the water collection channel 233, the smaller the transmembrane pressure difference. In other words, the smaller the width D1 of the water collection channel, the larger the cross-sectional area of the interstitial channel, which can better reduce the contaminants attached to the surface of the hollow fiber membrane bundle, that is, better discharge contaminants from the shell cavity.

[0078] Of course, in other feasible embodiments, the structure of the void channel is not limited thereto, and may also be any other regular or irregular shape.

[0079] Likewise, the distribution of the void channels is not limited thereto, and may also be distributed in a regular or irregular manner such as a rectangular array.

[0080] like Figure 6 As shown, another embodiment of the present invention provides an external pressure hollow fiber membrane module 300. Unlike the external pressure hollow fiber membrane module 100, the cross-sectional area of the interstitial channel 331 perpendicular to the axial direction of the shell 110 gradually decreases from the outside to the inside. Raw water or aeration flows through the interstitial channel 331 into the inner cavity 111 of the shell 110. As the raw water or aeration flows through the interstitial channel 331, the cross-sectional area of the interstitial channel 331 perpendicular to the axial direction of the shell 110 gradually decreases from the outside to the inside, thereby increasing the flow rate of the raw water or aeration. In other words, the speed of the raw water or aeration when it flows out of the interstitial channel increases, thereby increasing the impact force of the raw water or aeration on the root of the hollow fiber membrane bundle.

[0081] Generally, contaminants gradually accumulate in the hollow fiber membrane bundle from its base toward the center. This area also holds a higher concentration of contaminants. Increasing the impact of raw water on the base of the hollow fiber membrane bundle can effectively reduce the amount of contaminants adhering to the base. Increasing the impact of aeration on the base of the hollow fiber membrane bundle can more quickly remove dirt from the base.

[0082] An embodiment of the present invention further provides a filtering device, comprising the external pressure hollow fiber membrane assembly provided by the present invention.

[0083] The filter device features two end components with interstitial channels, allowing raw water or aeration to drain smoothly from the housing's interior. This allows contaminants outside the hollow fiber membranes to flow easily through the interstitial channels, preventing excessive accumulation of contaminants at the base of the hollow fiber membranes. This reduces the filtration energy consumption of the external pressure hollow fiber membrane module while maintaining its filtration efficiency.

[0084] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0085] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. An external pressure hollow fiber membrane module, characterized in that: include: a housing having an inner cavity; as well as Two end head components are respectively arranged at the two ends of the inner cavity of the shell; the end head component is provided with a plurality of gap channels penetrating the end head component along the axial direction of the shell and a plurality of water collection channels interconnected, each water collection channel corresponds to a different hollow fiber membrane bundle, the hollow fiber membrane bundle is arranged in the inner cavity of the shell, and the hollow fiber membrane bundle corresponding to each water collection channel is independently arranged; the gap channels and the water collection channels are arranged alternately and spaced apart, and the gap channels of the two end head components are arranged opposite to each other, and the projections of the gap channels of the two end head components coincide with each other in a plane perpendicular to the axial direction of the shell; in the direction perpendicular to the axial direction of the shell, the cross-section of the gap channel is fan-shaped or fan-shaped; and along the axial direction of the shell, the cross-sectional area of the gap channel perpendicular to the axial direction of the shell gradually decreases from outside to inside; The external pressure hollow fiber membrane module further includes a first end cap sealedly connected to one end of the shell, a pulse aerator being provided on a side of the first end cap close to the inner cavity of the shell; the pulse aerator having an airflow release hole close to the end head component, and the airflow release hole is coaxial with the pulse aerator; A plurality of hollow fiber membrane bundles are provided in the inner cavity of the shell, wherein the width of the hollow fiber membrane bundle is less than or equal to 60 mm; The ratio of the width of the water collection channel to the width of the gap channel is less than 6.

2. The external pressure hollow fiber membrane module according to claim 1, characterized in that: In a direction perpendicular to the axial direction of the shell, the extension direction of the gap channel is a straight line, and a plurality of the gap channels are parallel to each other.

3. The external pressure hollow fiber membrane module according to claim 1, characterized in that: In the axial direction perpendicular to the shell, the cross section of the hollow fiber membrane bundle is circular and the outer diameter is less than 60 mm.

4. A filtering device, characterized in that: The invention comprises the external pressure type hollow fiber membrane module according to any one of claims 1 to 3.

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