Oxygen enrichment membrane assembly and oxygen enrichment machine

Abstract

The invention discloses an oxygen enrichment membrane assembly and an oxygen enrichment machine, the oxygen enrichment membrane assembly comprises a shell and a membrane layer, the membrane layer is an oxygen enrichment membrane, a mounting cavity is formed in the shell, the membrane layer is arranged in the mounting cavity of the shell, and the membrane layer is connected with the shell and divides the mounting cavity into a membrane inner cavity and a membrane outer cavity; a first vent hole and a second vent hole which are communicated with the membrane outer cavity are formed in the shell, and an airflow channel flowing through the outer surface of the membrane layer is formed between the first vent hole and the second vent hole, so that nitrogen molecules attached to the outer surface of the membrane layer are discharged out of the membrane outer cavity along the airflow channel; the membrane inner cavity is communicated with a negative pressure device in a sealed mode, and the negative pressure device is used for driving air to enter the membrane inner cavity from the membrane outer cavity through the membrane layer. The airflow channel flowing through the outer surface of the membrane layer is formed between the first vent hole and the second vent hole which are communicated with the outside of the membrane, nitrogen molecules attached to the outer surface of the membrane layer are discharged through airflow of the airflow channel, and the situation that the oxygen separation efficiency is reduced due to the fact that the nitrogen molecules block the membrane layer is avoided.

Description

Technical Field

[0001] This application relates to the field of membrane separation oxygen generation technology, and in particular to an oxygen-enriched membrane module and an oxygen-enriching machine. Background Technology

[0002] The oxygen-enriched membrane module is an important component of the oxygen-enriched machine. The working principle of the oxygen-enriched membrane is based on the difference in the permeation rate of different gases in a specific polymer membrane material, so as to achieve selective physical separation of oxygen and nitrogen in the air. No chemical reaction is required in the separation process, and no separating agent is consumed. It has the advantages of low energy consumption and no pollution.

[0003] In related technologies, spiral wound molecular sieve membranes are used as oxygen-enriching membranes. These membranes consist of a molecular sieve layer and a substrate layer, which are alternately stacked and bonded together. The spiral wound molecular sieve layers can adsorb nitrogen from the air layer by layer, thus achieving hierarchical separation of nitrogen and oxygen. While alternating molecular sieve and substrate layers can separate oxygen molecules from the air, the separated nitrogen molecules need to be expelled from the oxygen-enriching membrane; otherwise, membrane blockage will occur, reducing the separation efficiency. However, for stacked membranes, it is difficult to expel nitrogen molecules regardless of whether positive or negative pressure is used, further reducing the membrane's separation efficiency. Furthermore, the surface area of ​​the oxygen-enriching membrane is positively correlated with the oxygen flow rate of the oxygen concentrator. For portable or small oxygen concentrators, the surface area of ​​the oxygen-enriching membrane is limited due to space constraints. Existing technologies use multiple small-area oxygen-enriching membranes in combination. The combination method involves setting air outlets on the frame of the oxygen-enriching membrane and using a parallel connection method. The frame enables the superposition and combination of multiple membranes. The connectors and frames of this structure occupy a lot of space and are not suitable for portable or small oxygen concentrators. Summary of the Invention

[0004] This application aims to address one of the technical problems in related technologies to a certain extent. To this end, this application provides an oxygen-enriched membrane assembly and an oxygen-enriching machine, which can improve the removal efficiency of nitrogen molecules from the oxygen-enriched membrane, thereby improving the oxygen separation efficiency of the oxygen-enriched membrane.

[0005] To achieve the above objectives, this application adopts the following technical solution: an oxygen-enriched membrane assembly, comprising a housing and a membrane layer, wherein the membrane layer is configured as an oxygen-enriched membrane, an installation chamber is formed inside the housing, the membrane layer is disposed within the installation chamber of the housing, the membrane layer is connected to the housing and divides the installation chamber into an inner membrane chamber and an outer membrane chamber; The housing is provided with a first vent hole and a second vent hole that communicate with the outer cavity of the membrane. An airflow channel is formed between the first vent hole and the second vent hole, which flows through the outer surface of the membrane, so that nitrogen molecules attached to the outer surface of the membrane are discharged from the outer cavity of the membrane along the airflow channel. The inner cavity of the membrane is sealed and connected to a negative pressure device, which is used to drive air from the outer cavity of the membrane through the membrane layer into the inner cavity of the membrane. In this technical solution, the installation chamber of the shell is divided into an inner membrane cavity and an outer membrane cavity by a membrane layer. Air from the outer membrane cavity flows into the inner membrane cavity through the membrane layer to obtain air with a high oxygen content. A first vent and a second vent are provided to communicate with the outside of the membrane, and an airflow channel is formed between the first vent and the second vent to flow through the outer surface of the membrane layer. The airflow through the airflow channel discharges nitrogen molecules attached to the outer surface of the membrane layer, preventing nitrogen molecules from accumulating or adhering to the membrane layer and avoiding the reduction of oxygen separation efficiency due to nitrogen molecules clogging the membrane layer. The oxygen-enriched air in the inner membrane cavity is driven out of the inner membrane cavity by a negative pressure device for use.

[0006] Preferably, the shell is configured as a cylindrical structure, including an outer cylinder, a first end cap, and a second end cap, wherein the first end cap and the second end cap are respectively fixedly connected to both ends of the outer cylinder; The membrane layer forms an inner cylinder within the housing, aligned with the axial direction of the housing. The membrane layer has several convex and concave structures to increase the contact area between the membrane layer and the air in the outer cavity. By designing the housing as a cylindrical outer cylinder and including first and second end caps, the installation and use of the oxygen-enriched membrane assembly are facilitated. The membrane layer's convex and concave structure increases its area, thereby improving the oxygen-generating capacity of the oxygen-enriched membrane assembly, making it suitable for small and portable oxygen concentrators.

[0007] Preferably, the first end cap of the housing is provided with a plurality of first vent holes, and the second end cap is provided with a plurality of second vent holes. The plurality of first vent holes and the plurality of second vent holes are arranged and aligned one-to-one along the axial direction of the housing. By providing a plurality of one-to-one corresponding and aligned first vent holes and second vent holes on the first end cap and the second end cap, the airflow in the airflow channel is made smoother, thereby improving the airflow velocity and the efficiency of nitrogen molecule discharge.

[0008] Preferably, a connecting hole is provided on the end face of either the first end cap or the second end cap. The connecting hole is sealed to the negative pressure device, which draws air from the inner cavity of the membrane through the connecting hole, thereby creating a negative pressure in the inner cavity of the membrane relative to the outer cavity of the membrane. By providing a connecting hole on the first or second end cap to draw air from the inner cavity of the membrane, air delivery is completed while simultaneously driving air from the outer cavity of the membrane into the inner cavity.

[0009] Preferably, the negative pressure device is a vacuum pump.

[0010] Preferably, the membrane layer has a plurality of toothed protrusions and convexities formed in the circumferential direction. The first end cap and the second end cap each have connecting ribs corresponding to the toothed protrusions and convexities on their sides facing the membrane layer. These connecting ribs are sealed to the two end faces of the membrane layer. By setting the membrane layer to a toothed protrusion and convex structure, the surface area of ​​the membrane layer can be greatly increased. The connecting ribs on the first and second end caps facilitate a sealed connection with the membrane layer.

[0011] Preferably, the membrane layer has a plurality of tooth-like convex and concave structures forming a plurality of convex teeth on the outer surface of the membrane layer, and grooves are formed between adjacent convex teeth.

[0012] Preferably, the plurality of first vent holes on the first end cap and the plurality of second vent holes on the second end cap correspond to the toothed groove shape on the outer surface of the membrane layer, so that the first vent holes and second vent holes, which are correspondingly and aligned, are connected along the toothed groove. The plurality of sets of first vent holes and second vent holes form a plurality of airflow channels, increasing the contact area between the airflow channels and the membrane layer, and increasing the efficiency of the airflow channels in expelling nitrogen molecules from the surface of the membrane layer.

[0013] Preferably, the protruding teeth of the film layer are identical in shape and are continuously and uniformly distributed. The uniformly distributed and identically shaped toothed structure can further increase the surface area of ​​the film layer.

[0014] Preferably, the shell is configured with a cross-section that is circular, rectangular, rhomboid, or elliptical.

[0015] Furthermore, to achieve the aforementioned objectives, this application also proposes an oxygen enrichment machine, including an oxygen enrichment membrane assembly as described in any of the above technical solutions. The reasoning process for the beneficial effects of the oxygen enrichment machine provided in this application and the aforementioned oxygen enrichment membrane assembly is similar and will not be repeated here.

[0016] These features and advantages of this application will be disclosed in detail in the following specific embodiments and accompanying drawings. The best embodiments or means of this application will be shown in detail in conjunction with the accompanying drawings, but are not intended to limit the technical solutions of this application. In addition, each of these features, elements and components appearing in the following text and drawings is multiple and is labeled with different symbols or numbers for convenience, but all represent parts with the same or similar structure or function. Attached Figure Description

[0017] The following description, in conjunction with the accompanying drawings, further illustrates this application: Figure 1 This is a three-dimensional structural diagram of the oxygen-enriched membrane assembly in this embodiment; Figure 2 This is a cross-sectional view of the oxygen-enriched membrane assembly in this embodiment; Figure 3This is an exploded view of the oxygen-enriched membrane assembly in this embodiment; Figure 4 This is a schematic diagram of the membrane structure of the oxygen-enriched membrane module in this embodiment; Figure 5 This is a schematic diagram of the first end cap structure of the oxygen-enriched membrane assembly in this embodiment; Figure 6 This is a schematic diagram of the second end cap structure of the oxygen-enriched membrane assembly in this embodiment; Figure 7 This is a schematic diagram of the airflow direction of the oxygen-enriched membrane module in this embodiment.

[0018] Explanation of reference numerals in the attached figures: Among them, 100 is the shell; 110 is the outer cylinder; 120 is the first end cap; 121 is the first vent; 122 is the connecting hole; 123 is the connecting rib; 130 is the second end cap; 122 is the second vent; 200 is the membrane layer; 210 is the toothed part; 220 is the tooth groove. Detailed Implementation

[0019] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are intended to explain this application and should not be construed as limiting it.

[0020] The terms "an embodiment," "example," or "example" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this application. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0021] In related technologies, oxygen-enriched membrane modules utilize spiral-wound molecular sieve membranes. These membranes consist of a molecular sieve layer and a substrate layer, which are alternately stacked and bonded together. The spiral-wound molecular sieve layers can adsorb nitrogen from the air layer by layer, thus achieving hierarchical separation of nitrogen and oxygen. While alternating molecular sieve and substrate layers can separate oxygen molecules from the air, the separated nitrogen molecules need to be expelled from the membrane; otherwise, membrane blockage will occur, reducing separation efficiency. However, for stacked membranes, it is difficult to expel nitrogen molecules regardless of whether positive or negative pressure is used, further reducing separation efficiency. Furthermore, the surface area of ​​the oxygen-enriching membrane is positively correlated with the oxygen flow rate of the oxygen concentrator. For portable or small oxygen concentrators, the surface area of ​​the oxygen-enriching membrane is limited due to space constraints. Existing technologies use multiple small-area oxygen-enriching membranes in combination. The combination method involves setting air outlets on the frame of the oxygen-enriching membrane and using a parallel connection method. The frame enables the superposition and combination of multiple membranes. The connectors and frames of this structure occupy a lot of space and are not suitable for portable or small oxygen concentrators.

[0022] like Figures 1 to 7 As shown, this embodiment provides an oxygen-enriched membrane assembly, including a housing 100 and a membrane layer 200. The membrane layer 200 is configured as an oxygen-enriched membrane. An installation chamber is formed inside the housing 100. The membrane layer 200 is disposed in the installation chamber of the housing 100. The membrane layer 200 is connected to the housing 100 and divides the installation chamber into an inner membrane chamber and an outer membrane chamber. The housing 100 is provided with a first vent 121 and a second vent 131 communicating with the outer cavity of the membrane. An airflow channel is formed between the first vent 121 and the second vent 131, which flows through the outer surface of the membrane layer 200, so that nitrogen molecules attached to the outer surface of the membrane layer 200 are discharged from the outer cavity of the membrane along the airflow channel. The inner cavity of the membrane is sealed and connected to a negative pressure device, which is used to drive air from the outer cavity of the membrane through the membrane layer 200 into the inner cavity of the membrane. In this technical solution, the installation chamber of the housing 100 is divided into an inner membrane cavity and an outer membrane cavity by the membrane layer 200. Air from the outer membrane cavity flows into the inner membrane cavity through the membrane layer 200 to obtain air with a high oxygen content. By setting a first vent 121 and a second vent 131 that communicate with the outside of the membrane, an airflow channel is formed between the first vent 121 and the second vent 131 to flow through the outer surface of the membrane layer 200. The airflow through the airflow channel discharges nitrogen molecules attached to the outer surface of the membrane layer 200, avoiding the accumulation or attachment of nitrogen molecules on the outer surface of the membrane layer 200, and preventing the membrane layer 200 from being blocked by nitrogen molecules, thus reducing the oxygen separation efficiency. The oxygen-enriched air in the inner membrane cavity is driven out of the inner membrane cavity by a negative pressure device for use.

[0023] In some embodiments, such as Figures 1 to 3 As shown, the housing 100 is a cylindrical structure, including an outer cylinder 110, a first end cap 120, and a second end cap 130. The first end cap 120 and the second end cap 130 are respectively fixedly connected to both ends of the outer cylinder 110. The membrane layer 200 forms an inner cylinder within the housing 100, which is in the same axial direction as the housing 100. The membrane layer 200 has several concave and convex structures to increase the contact area between the membrane layer 200 and the air in the outer cavity. By designing the housing 100 as a cylindrical outer cylinder 110 and the first end cap 120 and the second end cap 130, the installation and use of the oxygen-enriched membrane assembly are facilitated. By designing the membrane layer 200 as having several concave and convex structures, the area of ​​the membrane layer 200 can be increased, thereby improving the oxygen production capacity of the oxygen-enriched membrane assembly, making it suitable for small oxygen concentrators and portable oxygen concentrators. Specifically, the shell 100 is configured with a cross-section of one of the following: circular, rectangular, rhomboid, or elliptical. In this embodiment, the outer cylinder 110 is a cylindrical hollow cylinder, and the first end cap 120 and the second end cap 130 are disposed at both ends of the outer cylinder 110. For example, the first end cap 120 and the second end cap 130 are detachably plugged into the outer cylinder 110 and are also snapped together, so that the first end cap 120 and the second end cap 130 fix and support the membrane layer 200 inside the outer cylinder 110.

[0024] In some embodiments, such as Figures 2 to 4 As shown, the first end cap 120 of the housing 100 is provided with a plurality of first vent holes 121, and the second end cap 130 is provided with a plurality of second vent holes 131. The plurality of first vent holes 121 and the plurality of second vent holes 131 are arranged and aligned one-to-one along the axial direction of the housing 100. By providing a plurality of corresponding and aligned first vent holes 121 and second vent holes 131 on the first end cap 120 and the second end cap 130, the airflow in the airflow channel is made smoother, thereby improving the airflow velocity and the efficiency of nitrogen molecule discharge.

[0025] In some embodiments, such as Figure 2 , 3As shown in Figures 5 and 6, a connecting hole 122 is provided on the end face of either the first end cap 120 or the second end cap 130. The connecting hole 122 is sealed to the negative pressure device (not shown in the figure). The negative pressure device draws air from the inner cavity of the membrane through the connecting hole 122, so that the inner cavity of the membrane forms a negative pressure relative to the outer cavity of the membrane. By providing the connecting hole 122 on the first end cap 120 or the second end cap 130 to draw air from the inner cavity of the membrane, air delivery is completed while driving air from the outer cavity of the membrane to flow into the inner cavity of the membrane. Specifically, the negative pressure device is a vacuum pump. In other embodiments, other negative pressure devices can also be used to achieve the effect of driving air flow. In this embodiment, the connecting hole 122 is provided on the first end cap 120. It can be understood that the connecting hole 122 can also be provided on the second end cap 130. The first end cap 120 and the second end cap 130 mentioned in this embodiment are only used to indicate that there are two end caps and one of them is provided with a connecting hole 122, and are not intended to limit the specific structure of the first end cap 120 and the second end cap 130.

[0026] In some embodiments, such as Figure 3 , 4 As shown, the membrane layer 200 has a plurality of toothed convex and concave structures formed in the circumferential direction. The first end cap 120 and the second end cap 130 are each provided with connecting ribs 123 corresponding to the toothed convex and concave structures of the membrane layer 200 on their sides facing the membrane layer 200. The connecting ribs 123 are sealed to the two end faces of the membrane layer 200. By setting the membrane layer 200 with a toothed convex and concave structure, the surface area of ​​the membrane layer 200 can be greatly increased. The connecting ribs 123 on the first end cap 120 and the second end cap 130 facilitate a sealed connection with the membrane layer 200. Specifically, by providing connecting ribs 123 protruding from the inner surface of the end caps (the surface facing the interior of the housing 100) on the first end cap 120 and the second end cap 130, the membrane layer 200 can be bonded to both sides of the connecting ribs 123 by sealing adhesives, etc., thus sealing the membrane layer 200 with the first end cap 120 and the second end cap 130 to form a membrane cavity.

[0027] In some embodiments, such as Figure 4As shown, the film layer 200 has a plurality of tooth-like uneven structures forming a plurality of protruding teeth 210 on the outer surface of the film layer 200, and a tooth groove 220 is formed between adjacent protruding teeth 210. Specifically, the plurality of protruding teeth 210 of the film layer 200 have the same shape and are continuously and uniformly distributed. The uniformly distributed and identically shaped tooth-like uneven structures can further increase the surface area of ​​the film layer 200. It is understood that in other embodiments, the uneven structure of the film layer 200 shown can also be set as other forms of uneven structures that are not toothed, such as wavy or other composite types of multiple shapes. The distribution of the uneven structure can also be a non-uniform discrete distribution or a single structure. The specific shape and distribution of the uneven structure are not intended to limit the present invention.

[0028] In some embodiments, such as Figures 3 to 6 As shown, the plurality of first vent holes 121 of the first end cap 120 and the plurality of second vent holes 131 of the second end cap 130 correspond to the toothed groove shape on the outer surface of the membrane layer 200, so that the first vent holes 121 and second vent holes 131, which are correspondingly and aligned, are connected along the toothed groove. The plurality of sets of first vent holes 121 and second vent holes 131 form a plurality of airflow channels, increasing the contact area between the airflow channels and the membrane layer 200, and increasing the efficiency of the airflow channels in discharging nitrogen molecules from the surface of the membrane layer 200. Specifically, the first vent 121 of the first end cap 120, the toothed groove of the membrane layer 200, and the second vent 131 of the second end cap 130 are formed into straight airflow channels with the same cross-sectional shape. This allows airflow to flow smoothly from the first vent 121 through the outer surface of the membrane layer 200 to the second vent 131, or from the second vent 131 through the outer surface of the membrane layer 200 to the first vent 121. During this process, nitrogen molecules adhering to the outer surface of the membrane layer 200 are discharged, preventing nitrogen molecules from clogging the membrane layer 200. In other embodiments, a fan or other air-driving device can be installed on the outside of the first end cap 120 or the second end cap 130 to further accelerate the airflow velocity in the airflow channels within the oxygen-enriched membrane assembly, thereby improving the nitrogen molecule discharge efficiency in the membrane layer 200.

[0029] like Figure 3 , 7As shown, the oxygen-enriched membrane assembly of this embodiment forms a hollow structure through the membrane layer 200. The first end cap 120 and the second end cap 130 are sealed and connected to the two ends of the membrane cavity formed by the membrane layer 200. The first end cap 120 is provided with a connecting hole 122, which communicates with the membrane cavity and is connected to a vacuum pump. The vacuum pump drives the air outside the housing 100 to enter the outer membrane cavity along the airflow channel, and after passing through the membrane layer 200, it enters the inner membrane cavity. The air in the outer membrane cavity passes through the membrane layer 200 to filter out oxygen molecules, which enter the inner membrane cavity and are then delivered to the human body by the vacuum pump. Other gas molecules that do not enter the inner membrane cavity will remain in the outer membrane cavity. By setting a fan or other device on the outside of the first end cap 120 or the second end cap 130, the gas molecules remaining in the outer membrane cavity are discharged from the outer membrane cavity, avoiding the retention of nitrogen molecules and other gases in the outer membrane cavity, which would affect the oxygen production efficiency. At the same time, it can also accelerate the entry of air with oxygen molecules from outside the housing 100 into the outer membrane cavity, thereby improving the oxygen production efficiency.

[0030] In addition, this embodiment also provides an oxygen enrichment machine, including the oxygen enrichment membrane assembly described in any of the above embodiments.

[0031] In summary, the oxygen-enriched membrane assembly provided in the above embodiments can improve the removal efficiency of nitrogen molecules in the oxygen-enriched membrane, thereby improving the oxygen separation efficiency of the oxygen-enriched membrane.

[0032] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Those skilled in the art should understand that this application includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this application will be included within the scope of the claims.

Claims

1. An oxygen-enriched membrane module comprising a housing (100) and a membrane layer (200), the membrane layer (200) being provided as an oxygen-enriched membrane, characterized in that An installation chamber is formed inside the housing (100), and the membrane layer (200) is disposed in the installation chamber of the housing (100). The membrane layer (200) is connected to the housing (100) and divides the installation chamber into an inner membrane cavity and an outer membrane cavity. The housing (100) is provided with a first vent (121) and a second vent (131) communicating with the outer cavity of the membrane. An airflow channel is formed between the first vent (121) and the second vent (131) to flow through the outer surface of the membrane layer (200), so that nitrogen molecules attached to the outer surface of the membrane layer (200) are discharged from the outer cavity of the membrane along the airflow channel. The inner cavity of the membrane is sealed and connected to a negative pressure device, which is used to drive air from the outer cavity of the membrane through the membrane layer (200) into the inner cavity of the membrane.

2. The oxygen-enriched membrane module of claim 1, wherein, The shell (100) is configured as a cylindrical structure, including an outer cylinder (110), a first end cap (120) and a second end cap (130), the first end cap (120) and the second end cap (130) being fixedly connected to both ends of the outer cylinder (110); The membrane layer (200) forms an inner cylinder within the housing (100) in the same axial direction as the housing (100). The membrane layer (200) has a plurality of concave and convex structures to increase the contact area between the membrane layer (200) and the air in the outer cavity.

3. The oxygen-enriched membrane module of claim 2, wherein, The first end cap (120) of the housing (100) is provided with a plurality of first vent holes (121), and the second end cap (130) is provided with a plurality of second vent holes (131). The plurality of first vent holes (121) and the plurality of second vent holes (131) are provided and aligned one-to-one along the axial direction of the housing (100).

4. The oxygen-enriched membrane module of claim 3, wherein, A connecting hole (122) is provided on the end face of either the first end cap (120) or the second end cap (130). The connecting hole (122) is sealed to the negative pressure device. The negative pressure device draws air from the inner cavity of the membrane through the connecting hole (122) so that the inner cavity of the membrane forms a negative pressure relative to the outer cavity of the membrane.

5. The oxygen-enriched membrane module of claim 4, wherein, The negative pressure device is a vacuum pump.

6. The oxygen-enriched membrane module of claim 3, wherein, The membrane layer (200) has a plurality of toothed concave and convex structures formed in the circumferential direction. The first end cap (120) and the second end cap (130) are provided with connecting ribs (123) on the side facing the membrane layer (200) that correspond to the toothed concave and convex structures of the membrane layer (200). The connecting ribs (123) are sealed to the two end faces of the membrane layer (200).

7. The oxygen-enriched membrane module of claim 6, wherein, The membrane (200) has a plurality of tooth-like uneven structures forming a plurality of protruding teeth (210) on the outer surface of the membrane (200), and a tooth groove (220) is formed between adjacent protruding teeth (210).

8. The oxygen-enriched membrane module of claim 7, wherein, The first vent holes (121) of the first end cap (120) and the second vent holes (131) of the second end cap (130) are all corresponding to the toothed groove shape on the outer surface of the membrane layer (200), so that the first vent holes (121) and the second vent holes (131) that are corresponding and aligned are connected along the toothed groove.

9. The oxygen-enriched membrane module of claim 7, wherein, The plurality of convex tooth portions (210) of the film layer (200) are of the same shape and are continuously and uniformly distributed.

10. The oxygen-enriched membrane assembly of any one of claims 2 to 9, wherein, The shell (100) is provided in one of a circular, rectangular, rhombic or elliptical cross section.

11. An oxygen concentrator, characterized by, An oxygen-enriched membrane module comprising the oxygen-enriched membrane assembly of any one of claims 1 to 10.

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