End joint of cross-flow filter element, cross-flow filter element and cross-flow filter

Abstract

The utility model discloses an end joint of a cross-flow filter element, the cross-flow filter element and a cross-flow filter, and solves the technical problems of poor sealing performance, high connection strength and easiness in aging and failure in the connection of a bonding mode in the prior art. The end part joint comprises an inner supporting pipe, and the upper end of the inner supporting pipe is welded with the end part of the inner filter pipe; the upper end of the outer supporting pipe is welded with the end part of the outer filter pipe; the inner supporting pipe and the outer supporting pipe are coaxially arranged; a feeding channel or a discharging channel communicated with the stock solution cavity is formed between the inner supporting pipe and the outer supporting pipe; the inner and outer supporting pipe connecting structure comprises welding surfaces which are arranged on the bottom surface of the inner supporting pipe and the bottom surface of the outer supporting pipe and are matched with each other; the inner and outer clear liquid cavity communicating structure is used for communicating the inner clear liquid cavity with the outer clear liquid cavity; the inner and outer clear liquid cavity communicating structure comprises a convex part arranged outside the lower end of the inner supporting pipe and a clear liquid flowing channel penetrating through the inner supporting pipe, the outer supporting pipe and the convex part, and the outer wall of the convex part is matched with the inner wall of the outer supporting pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of cross-flow filtration, in particular to an end joint of a cross-flow filter element, a cross-flow filter element and a cross-flow filter. Background Art

[0002] Liquid filtration is divided into terminal filtration and cross-flow filtration. When terminal filtration is used, the raw liquid (i.e., the liquid before filtration) does not generate membrane surface flow on the filter membrane surface. Therefore, the filter cake layer on the membrane surface gradually thickens during the filtration cycle, and the filtration volume decreases rapidly with the increase of filtration time, and the backwash cycle is short. When cross-flow filtration is used, the raw liquid will flow along the membrane surface at a certain speed. During this process, a part of the raw liquid permeates the filter membrane by pressure difference and becomes clear liquid (i.e., the filtered liquid), while the unfiltered liquid continues to flow along the membrane surface to become concentrated liquid and reflux to the raw liquid pool for circulation. Therefore, only a small amount of filter cake is formed on the membrane surface during the filtration cycle, and the filtration volume slowly decreases with the increase of filtration time, and the backwash cycle is longer. Due to the different filtration methods of terminal filtration and cross-flow filtration, there are significant differences in the structure of existing terminal filters and cross-flow filters.

[0003] But whether it is a terminal filter or a cross-flow filter, the filter element assembly therein is the key equipment to achieve its filtration. Chinese utility model patent CN201643834U discloses a filter element assembly for cross-flow filtration, and the number of filter element assemblies is one. CN201719900U discloses a filter element assembly for cross-flow filtration, and the filter element assemblies are distributed in an array. The filter element assemblies in both schemes include an inner filter tube and an outer filter tube. A raw liquid cavity is formed between the inner filter tube and the outer filter tube. The inner filter tube is inside the inner clear liquid cavity, and the outer filter tube is outside the outer clear liquid cavity. Both ends of the inner filter tube and the outer filter tube are fixed by joints. The inner filter tube mounting part and the outer filter tube mounting part in the joint are an integrated structure. Due to the limitation of the operating space, the joint is connected to the inner filter tube and the outer filter tube by bonding, which not only has poor sealing and low connection strength, but also is prone to aging and failure. Utility Model Content

[0004] The main purpose of the utility model is to provide an end joint of a cross-flow filter element, a cross-flow filter element and a cross-flow filter, so as to solve the technical problems of poor sealing, connection strength and easy aging failure existing in the bonding connection in the prior art.

[0005] In order to achieve the above object, according to the first aspect of the utility model, two end joints of a cross-flow filter element are provided, and the technical scheme is as follows:

[0006] The first end joint of the cross-flow filter element: the cross-flow filter element includes an inner filter tube and an outer filter tube, a raw liquid cavity is formed between the inner filter tube and the outer filter tube, the inside of the inner filter tube is an inner clear liquid cavity, and the outside of the outer filter tube is an outer clear liquid cavity; the end joint includes: an inner support tube, the upper end of the inner support tube is welded to the end of the inner filter tube; an outer support tube, the upper end of the outer support tube is welded to the end of the outer filter tube; the inner support tube and the outer support tube are coaxially arranged; a feed channel or a discharge channel connected to the raw liquid cavity is formed between the inner support tube and the outer support tube; the upper end of the inner support tube is higher than the upper end of the outer support tube; an inner and outer clear liquid cavity connecting structure is used to connect the inner clear liquid cavity and the outer clear liquid cavity; the inner and outer clear liquid cavity connecting structure includes a connecting beam connecting the outside of the lower end of the inner support tube and the outside of the lower end of the outer support tube, and a clear liquid flow channel that runs through the inner support tube, the outer support tube and the connecting beam.

[0007] As a further improvement of the first end joint mentioned above: the upper end of the inner support tube is 40 to 60 mm higher than the upper end of the outer support tube.

[0008] As a further improvement of the first end joint mentioned above: the outer portion of the upper end of the inner support tube is provided with a first step adapted to the end of the inner filter tube; the inner portion of the upper end of the outer support tube is provided with a second step adapted to the end of the outer filter tube.

[0009] As a further improvement of the first end joint mentioned above: the length of the first step and the second step is 8 to 15 mm.

[0010] As a further improvement of the first end joint mentioned above: the distance between the bottom of the first step and the top of the connecting beam is 10 to 20 mm.

[0011] As a further improvement of the first end joint mentioned above: the inner and outer clear liquid cavity communication structures are two and symmetrically arranged.

[0012] As a further improvement of the first end joint mentioned above: the cross-section of the clear liquid flow channel is in the shape of an elongated strip.

[0013] The second end joint of the cross-flow filter element: the cross-flow filter element includes an inner filter tube and an outer filter tube, a raw liquid cavity is formed between the inner filter tube and the outer filter tube, the inner filter tube is an inner clear liquid cavity, and the outer filter tube is an outer clear liquid cavity; the end joint includes: an inner support tube, the upper end of the inner support tube is welded to the end of the inner filter tube; an outer support tube, the upper end of the outer support tube is welded to the end of the outer filter tube; the inner support tube and the outer support tube are coaxially arranged; a feed channel or a discharge channel connected to the raw liquid cavity is formed between the inner support tube and the outer support tube; an inner and outer support tube connection structure includes welding surfaces arranged on the bottom surfaces of the inner support tube and the bottom surfaces of the outer support tube and matching with each other; an inner and outer clear liquid cavity connecting structure is used to connect the inner clear liquid cavity and the outer clear liquid cavity; the inner and outer clear liquid cavity connecting structure includes a raised portion arranged on the outside of the lower end of the inner support tube and a clear liquid flow channel that runs through the inner support tube, the outer support tube and the raised portion, and the outer wall of the raised portion is adapted to the inner wall of the outer support tube.

[0014] As a further improvement of the second end joint mentioned above: the outer portion of the upper end of the inner support tube is provided with a first step adapted to the end of the inner filter tube; the inner portion of the upper end of the outer support tube is provided with a second step adapted to the end of the outer filter tube.

[0015] As a further improvement of the second end joint, the length of the first step and the second step is 8 to 15 mm.

[0016] As a further improvement of the above second end joint: the distance between the bottom of the first step and the top of the raised portion is 10 to 20 mm.

[0017] As a further improvement of the above-mentioned second end joint: the inner and outer support tube connection structure includes a circular boss arranged on the bottom surface of the inner support tube and a circular ring member arranged on the bottom surface of the outer support tube, the inside of the circular ring member is inserted and matched with the circular boss to form a circular welding surface; the outer diameter of the circular ring member is adapted to the outer diameter of the inner support; the circular ring member and the outer support tube are connected by a beam plate adapted to the raised portion to form a feed port or a discharge port connected to the original liquid cavity.

[0018] As a further improvement of the above second end joint: the cross section of the welding surface is an inclined surface.

[0019] As a further improvement of the second end joint described above: the number of the inner and outer clear liquid cavity communicating structures is two and they are symmetrically arranged.

[0020] As a further improvement of the above-mentioned second end joint: the cross-section of the clear liquid flow channel is a long strip with a width of 10 to 20 mm and a length of 20 to 30 mm.

[0021] In order to achieve the above object, according to the second aspect of the utility model, a cross-flow filter element is provided, and the technical solution is as follows:

[0022] A cross-flow filter element comprises an inner filter tube, an outer filter tube and one or two end joints as described in the first aspect.

[0023] In order to achieve the above object, according to the third aspect of the utility model, a cross-flow filter is provided, and the technical solution is as follows:

[0024] A cross-flow filter comprises one or more cross-flow filter elements described in the second aspect above.

[0025] The end joint of the cross-flow filter element, the cross-flow filter element and the cross-flow filter of the utility model have the following advantages:

[0026] In the first end joint, the inner support tube and the outer support tube are an integrated structure. By raising the height of the upper end of the inner support tube, a height difference is formed between the upper end of the inner support tube and the upper end of the outer support tube, thereby expanding the installation space of the inner filter tube, so that the inner filter tube can be connected to the inner support tube by welding operation.

[0027] In the second end joint, the inner support tube and the outer support tube before installation are of a split structure, and thus can be welded to the inner filter tube and the outer filter tube respectively.

[0028] It can be seen that the end joint of the utility model has a simple structure, ingenious design, and is easy to process and manufacture. It realizes the welding connection between the end joint and the inner filter tube and the outer filter tube made of metal material, which can significantly improve the sealing and connection strength and extend the service life. It effectively solves the technical problems of poor sealing, connection strength, and easy aging and failure in the bonding connection method in the prior art, and has extremely strong practicality.

[0029] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. Additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings constituting a part of the present invention are used to assist the understanding of the present invention. The contents provided in the drawings and their related descriptions in the present invention can be used to explain the present invention, but do not constitute an improper limitation on the present invention.

[0031] In the attached picture:

[0032] Figure 1 This is a schematic structural diagram of the end joint of Example 1 of the utility model.

[0033] Figure 2 for Figure 1 AA section view.

[0034] Figure 3 for Figure 1 BB section view.

[0035] Figure 4 for Figure 2 CC section view.

[0036] Figure 5 This is a schematic diagram of the structure of the inner support tube in the end joint of Example 2 of the utility model.

[0037] Figure 6 for Figure 5 DD section view.

[0038] Figure 7 for Figure 5 EE section view.

[0039] Figure 8 for Figure 6 FF section view.

[0040] Fig. 9 This is a schematic diagram of the structure of the outer support tubes in the end joint of Example 2 of the utility model.

[0041] Fig.10 for Fig. 9 GG section view.

[0042] Fig.11 for Fig. 9 HH section view.

[0043] Fig.12 for Fig.10 II-direction cross-sectional view.

[0044] Fig.13 It is a cross-sectional view in one direction of the cross-flow filter element of Example 3 of the utility model.

[0045] Fig.14 This is a cross-sectional view of the cross-flow filter element in another direction of Example 3 of the utility model.

[0046] Fig.15 It is a cross-sectional view in one direction of the cross-flow filter element of Example 4 of the utility model.

[0047] Fig.16 This is a cross-sectional view of the cross-flow filter element of Example 4 of the utility model in another direction.

[0048] Fig.17 It is a cross-sectional view in one direction of the cross-flow filter element of Example 5 of the utility model.

[0049] Fig.18 This is a cross-sectional view of the cross-flow filter element of Example 5 of the utility model in another direction.

[0050] The relevant marks in the above drawings are:

[0051] 100 - inner support tube, 110 - first step, 200 - outer support tube, 210 - second step, 310 - connecting beam, 320 - clear liquid flow channel, 330 - raised portion, 410 - circular boss, 420 - circular ring, 430 - beam plate, 510 - inner filter tube, 520 - outer filter tube, 530 - original liquid chamber. DETAILED DESCRIPTION

[0052] The utility model is described clearly and completely below in conjunction with the accompanying drawings. A person skilled in the art will be able to implement the utility model based on these descriptions. Before describing the utility model in conjunction with the accompanying drawings, it should be particularly noted that:

[0053] The technical solutions and technical features provided in each part of the utility model, including the following description, can be combined with each other if there is no conflict.

[0054] In addition, the embodiments of the present invention involved in the following description are generally only a part of the embodiments of the present invention, rather than all of the embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0055] About the terms and units in the present invention: The terms "include", "have" and any variations thereof in the specification and claims of the present invention and related parts are intended to cover non-exclusive inclusions.

[0056] Example 1

[0057] Figure 1 Schematic diagram of the structure of the end joint of this embodiment. Figure 2 for Figure 1 AA section view. Figure 3 for Figure 1 BB section view. Figure 4 for Figure 2 CC section view.

[0058] The cross-flow filter element includes an inner filter tube 510 and an outer filter tube 520. A raw liquid cavity 530 is formed between the inner filter tube 510 and the outer filter tube 520. The inner filter tube 510 is an inner clear liquid cavity, and the outer filter tube 520 is an outer clear liquid cavity. Figure 1-4 The end joint of the cross-flow filter element shown includes an inner support tube 100, an outer support tube 200 and a communication structure between the inner and outer clear liquid cavities.

[0059] The upper end of the inner support tube 100 is welded to the end of the inner filter tube 510; the upper end of the outer support tube 200 is welded to the end of the outer filter tube 520; the inner support tube 100 and the outer support tube 200 are coaxially arranged; a feed channel or a discharge channel connected to the original liquid cavity 530 is formed between the inner support tube 100 and the outer support tube 200.

[0060] The inner and outer clear liquid cavity communication structure is used to connect the inner clear liquid cavity and the outer clear liquid cavity; the inner and outer clear liquid cavity communication structure includes a connecting beam 310 connecting the outer portion of the lower end of the inner support tube 100 and the outer portion of the lower end of the outer support tube 200, and a clear liquid flow channel 320 that penetrates the inner support tube 100, the outer support tube 200 and the connecting beam 310. The inner and outer clear liquid cavity communication structures are two and symmetrically arranged, so that the force can be uniformly applied and a faster clear liquid flow speed can be ensured. The cross section of the clear liquid flow channel 320 is a long strip, so that the clear liquid flow resistance can be reduced.

[0061] The upper end of the inner support tube 100 is higher than the upper end of the outer support tube 200. When the upper end of the inner support tube 100 is 40-60 mm (H1) higher than the upper end of the outer support tube 200, the welding operation is convenient and a higher inner filter area can be ensured.

[0062] In order to facilitate welding operation and reduce the scouring of the filter tube end by the flow of raw liquid, a first step 110 adapted to the end of the inner filter tube 510 is provided on the outer side of the upper end of the inner support tube 100, and a second step 210 adapted to the end of the outer filter tube 520 is provided on the inner side of the upper end of the outer support tube 200. The lengths of the first step 110 and the second step 210 are 8 to 15 mm (H2), so that a good connection strength can be ensured while maintaining a high filtration area. The distance between the bottom of the first step 110 and the top of the connecting beam 310 is 10 to 20 mm (H3), so that the connecting beam 310 can be prevented from hindering the welding operation of the inner filter tube 510 and the outer filter tube 520.

[0063] Example 2

[0064] Figure 5 Schematic diagram of the structure of the inner support tube 100 in the end joint of this embodiment. Figure 6 for Figure 5 DD section view. Figure 7 for Figure 5 EE section view. Figure 8 for Figure 6 FF section view. Fig. 9 Schematic diagram of the structure of the outer support tube 200 in the end joint of this embodiment. Fig.10 for Fig. 9 GG section view. Fig.11 for Fig. 9 HH section view. Fig.12 for Fig.10 II-direction cross-sectional view.

[0065] The cross-flow filter element includes an inner filter tube 510 and an outer filter tube 520. A raw liquid cavity 530 is formed between the inner filter tube 510 and the outer filter tube 520. The inner filter tube 510 is an inner clear liquid cavity, and the outer filter tube 520 is an outer clear liquid cavity. Figure 5-12 The end joint of the cross-flow filter element shown includes an inner support tube 100, an outer support tube 200, an inner and outer support tube connection structure, and an inner and outer clear liquid cavity communication structure.

[0066] The upper end of the inner support tube 100 is welded to the end of the inner filter tube 510; the upper end of the outer support tube 200 is welded to the end of the outer filter tube 520; the inner support tube 100 and the outer support tube 200 are coaxially arranged; a feed channel or a discharge channel connected to the original liquid cavity 530 is formed between the inner support tube 100 and the outer support tube 200.

[0067] The inner and outer support tube connection structure includes welding surfaces provided on the bottom surface of the inner support tube 100 and the bottom surface of the outer support tube 200 and matching each other; specifically, the inner and outer support tube connection structure includes a circular boss 410 provided on the bottom surface of the inner support tube 100 and a circular ring member 420 provided on the bottom surface of the outer support tube 200, the inner part of the circular ring member 420 is inserted and matched with the circular boss 410 to form a circular welding surface; the outer diameter of the circular ring member 420 is adapted to the outer diameter of the inner support; the circular ring member 420 and the outer support tube 200 are connected through a beam plate 430 adapted to the raised portion 330 and form a feed port or a discharge port connected to the original liquid chamber 530. The cross section of the welding surface is an inclined surface, which can improve the welding effect.

[0068] The inner and outer clear liquid cavity connecting structure is used to connect the inner clear liquid cavity and the outer clear liquid cavity; the inner and outer clear liquid cavity connecting structure includes a protrusion 330 arranged outside the lower end of the inner support tube 100 and a clear liquid flow channel 320 that penetrates the inner support tube 100, the outer support tube 200 and the protrusion 330, and the outer wall of the protrusion 330 is adapted to the inner wall of the outer support tube 200. The inner and outer clear liquid cavity connecting structures are two and symmetrically arranged, so that the force can be evenly applied and a faster clear liquid flow speed can be ensured. The cross-section of the clear liquid flow channel 320 is a long strip, which can reduce the clear liquid flow resistance. The cross-section of the clear liquid flow channel 320 is a long strip, with a width of 10 to 20 mm and a length of 20 to 30 mm, which facilitates the welding and sealing operation of the clear liquid flow channel 320 at the connection between the protrusion 330 and the outer support tube 200.

[0069] In order to facilitate welding operation and reduce the scouring of the filter tube end by the flow of raw liquid, a first step 110 adapted to the end of the inner filter tube 510 is provided on the outer side of the upper end of the inner support tube 100, and a second step 210 adapted to the end of the outer filter tube 520 is provided on the inner side of the upper end of the outer support tube 200. When the length of the first step 110 and the second step 210 is 8 to 15 mm, a good connection strength can be ensured while maintaining a high filtration area. The distance between the bottom of the first step 110 and the top of the protrusion 330 is 10 to 20 mm, which can prevent the protrusion 330 from hindering the welding operation of the inner filter tube 510 and the outer filter tube 520.

[0070] Example 4

[0071] Fig.13 It is a cross-sectional view of the cross-flow filter element of this embodiment in one direction. Fig.14 It is a cross-sectional view of the cross-flow filter element of this embodiment in another direction.

[0072] like Figure 13-14 The cross-flow filter element shown includes an inner filter tube 510 and an outer filter tube 520, and a raw liquid cavity 530 is formed between the inner filter tube 510 and the outer filter tube 520. The interior of the inner filter tube 510 is an inner clear liquid cavity, and the exterior of the outer filter tube 520 is an outer clear liquid cavity. Both ends of the inner filter tube 510 and the outer filter tube 520 are connected by the end joints of Example 1.

[0073] During assembly, firstly, the two ends of the inner filter tube 510 are welded to the inner support tube 100 , and then the two ends of the outer filter tube 520 are welded to the outer support tube 200 to form a cross-flow filter element.

[0074] Example 5

[0075] Fig.15 It is a cross-sectional view of the cross-flow filter element of this embodiment in one direction. Fig.16 It is a cross-sectional view of the cross-flow filter element of this embodiment in another direction.

[0076] like Figure 15-16 The cross-flow filter element shown includes an inner filter tube 510 and an outer filter tube 520, and a raw liquid cavity 530 is formed between the inner filter tube 510 and the outer filter tube 520. The interior of the inner filter tube 510 is an inner clear liquid cavity, and the exterior of the outer filter tube 520 is an outer clear liquid cavity. Both ends of the inner filter tube 510 and the outer filter tube 520 are connected by the end joints of Example 2.

[0077] The welding sequence during assembly is: welding the two ends of the inner filter tube 510 to the inner support tube 100, welding the inner support tube 100 and the outer support tube 200 through the inner and outer support tube connection structure, welding the two ends of the outer filter tube 520 to the outer support tube 200, and welding and sealing the clear liquid flow channel 320 at the connection between the protrusion 330 and the outer support tube 200 to form a cross-flow filter element.

[0078] Example 5

[0079] Fig.17 It is a cross-sectional view of the cross-flow filter element of this embodiment in one direction. Fig.18 It is a cross-sectional view of the cross-flow filter element of this embodiment in another direction.

[0080] like Figure 17-18 The cross-flow filter element shown includes an inner filter tube 510 and an outer filter tube 520, and a raw liquid cavity 530 is formed between the inner filter tube 510 and the outer filter tube 520. The interior of the inner filter tube 510 is an inner clear liquid cavity, and the exterior of the outer filter tube 520 is an outer clear liquid cavity. The lower ends of the inner filter tube 510 and the outer filter tube 520 are connected by the end joint of Example 1, and the upper ends are connected by the end joint of Example 2.

[0081] The welding sequence during assembly is: weld the two ends of the inner filter tube 510 to the upper and lower inner support tubes 100 respectively, weld the lower end of the outer filter tube 520 to the lower outer support tube 200, weld the upper inner support tube 100 and the outer support tube 200 through the inner and outer support tube connecting structure, weld the upper end of the outer filter tube 520 to the upper outer support tube 200, and weld and seal the clear liquid flow channel 320 at the connection between the upper raised portion 330 and the outer support tube 200 to form a cross-flow filter element.

[0082] An embodiment of the cross-flow filter of the utility model includes a cross-flow filter element described in one or more embodiments 3-5. The cross-flow filter element can be, but is not limited to, adopting the filter element assembly installation form disclosed in Chinese utility model patents CN201643834U and CN201719900U.

[0083] The above is an explanation of the relevant contents of the utility model. A person skilled in the art will be able to implement the utility model based on these explanations. Based on the above contents of the utility model, all other embodiments obtained by a person skilled in the art without creative work shall fall within the scope of protection of the utility model.

Claims

1. An end joint of a cross-flow filter element, wherein the cross-flow filter element comprises an inner filter tube (510) and an outer filter tube (520), wherein a raw liquid cavity (530) is formed between the inner filter tube (510) and the outer filter tube (520), wherein the interior of the inner filter tube (510) is an inner clear liquid cavity, and the exterior of the outer filter tube (520) is an outer clear liquid cavity; the characteristics are as follows: End fittings include: An inner support tube (100), the upper end of the inner support tube (100) being welded to the end of the inner filter tube (510); An outer support tube (200), the upper end of the outer support tube (200) being welded to the end of the outer filter tube (520); the inner support tube (100) and the outer support tube (200) being coaxially arranged; a feed channel or a discharge channel communicating with the original liquid chamber (530) being formed between the inner support tube (100) and the outer support tube (200); The inner and outer support tube connection structure comprises welding surfaces provided on the bottom surface of the inner support tube (100) and the bottom surface of the outer support tube (200) and matching with each other; The inner and outer clear liquid cavity communication structure is used to communicate the inner clear liquid cavity and the outer clear liquid cavity; the inner and outer clear liquid cavity communication structure comprises a protrusion (330) arranged outside the lower end of the inner support tube (100) and a clear liquid flow channel (320) that runs through the inner support tube (100), the outer support tube (200) and the protrusion (330); the outer wall of the protrusion (330) and the inner wall of the outer support tube (200) are adapted to each other.

2. The end fitting according to claim 1, characterized in that: The upper end of the inner support tube (100) is provided with a first step (110) adapted to the end of the inner filter tube (510); the upper end of the outer support tube (200) is provided with a second step (210) adapted to the end of the outer filter tube (520).

3. The end fitting according to claim 2, characterized in that: The lengths of the first step (110) and the second step (210) are 8 to 15 mm.

4. The end fitting according to claim 2, characterized in that: The distance between the bottom of the first step (110) and the top of the protrusion (330) is 10 to 20 mm.

5. The end fitting according to claim 1, characterized in that: The inner and outer support tube connection structure comprises a circular boss (410) arranged on the bottom surface of the inner support tube (100) and a circular ring member (420) arranged on the bottom surface of the outer support tube (200); the interior of the circular ring member (420) is inserted and matched with the circular boss (410) to form a circular welding surface; the outer diameter of the circular ring member (420) is matched with the outer diameter of the inner support; the circular ring member (420) and the outer support tube (200) are connected through a beam plate (430) matched with the raised portion (330) to form a feed port or a discharge port connected to the original liquid cavity (530).

6. The end fitting according to claim 5, characterized in that: The cross section of the welding surface is an inclined surface.

7. The end fitting according to claim 1, characterized in that: The inner and outer clear liquid cavity communication structures are two and symmetrically arranged.

8. The end fitting according to claim 1, characterized in that: The cross section of the clear liquid flow channel (320) is in the shape of an elongated strip, with a width of 10 to 20 mm and a length of 20 to 30 mm.

9. A cross-flow filter element, comprising an inner filter tube (510) and an outer filter tube (520), characterized in that: Also included is the end fitting as claimed in any one of claims 1-8.

10. A cross-flow filter, characterized in that: Comprising one or more cross-flow filter elements as claimed in claim 9.

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