Hollow fiber membrane module unit

Abstract

The present invention relates to a hollow fiber membrane assembly unit, which is a hollow fiber membrane assembly unit composed of a plurality of hollow fiber membrane elements arranged in parallel with collecting pipe covers provided at both ends, and is characterized in that the connection between adjacent collecting pipe covers installed on the permeate liquid side of the hollow fiber membrane elements is carried out by side sealing connection and connection based on support rods.

Description

Technical Field

[0001] The present invention relates to a hollow fiber membrane module unit composed of a plurality of hollow fiber membrane modules. Background Art

[0002] The pressurized hollow fiber membrane module has the advantages of energy saving and space saving, and therefore is being used in a wide range of fields. For example, Patent Documents 1 and 2 propose methods for saving space for installation, and Patent Document 2 discloses the structure of a hollow fiber membrane module unit in which a plurality of hollow fiber membrane modules are stored in a unit frame and the module cover and a header are connected via a flexible hose.

[0003] In contrast, Patent Document 3 discloses a structure of a hollow fiber membrane module unit characterized by using a header cover in which a module cover and a header are integrated. Also disclosed is a method for connecting a hollow fiber membrane module to a header cover and a method for suppressing an axial force applied to a connection portion.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2013-52386

[0007] Patent Document 2: Japanese Patent Application Publication No. 2009-28716

[0008] Patent Document 3: European Patent No. 1743690 Summary of the invention

[0009] Problems to be solved by the invention

[0010] However, Patent Document 3 does not describe a method for connecting the header covers to each other or a method for suppressing an axial force applied to the connection portion between the header covers.

[0011] An object of the present invention is to provide a hollow fiber membrane module unit that can achieve a balance between allowing dimensional errors of components, ensuring good assemblability, and suppressing displacement, deformation, and damage of header covers caused by axial forces applied to connecting portions of header covers.

[0012] Means for solving problems

[0013] In order to solve the above-mentioned problems, the present invention has the following configurations.

[0014] (1) A hollow fiber membrane assembly unit, which is composed of a plurality of hollow fiber membrane elements arranged in parallel with collecting covers installed at both ends, characterized in that the adjacent collecting covers installed on the permeate side of the hollow fiber membrane elements are connected to each other by side sealing connections covering the outer periphery of the abutment surface, and the collecting covers at least at both ends of the column are fixed by support rods.

[0015] (2) The hollow fiber membrane module unit according to (1), characterized in that the adjacent header covers are connected to each other by side seal connection covering the outer periphery of the abutment surface and connection by support rods.

[0016] (3) The hollow fiber membrane module unit according to (1) or (2), characterized in that the side seal connection is a groove-type connection in which a groove is provided on the outer periphery of the connection portion of the header cover.

[0017] (4) The hollow fiber membrane module unit according to any one of (1) to (3), wherein the support bar is located on the opposite side of the hollow fiber membrane element across the header cover.

[0018] (5) The hollow fiber membrane module unit according to any one of (1) to (4), wherein the support bars are provided in two rows with respect to the header cover.

[0019] Effects of the Invention

[0020] When the hollow fiber membrane component unit of the present invention uses a manifold cover that integrates the component cover and the manifold, the connection between the manifold covers is carried out by using a side seal connection covering the outer periphery of the abutment surface and a connection based on a support rod. This allows for dimensional errors of the various components that constitute the hollow fiber membrane component unit and ensures good assembly while suppressing displacement and deformation of the manifold cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 One embodiment of the hollow fiber membrane module unit of the present invention is shown. Figure 1 (a) is a schematic three-dimensional diagram. Figure 1 (b) is a schematic three-dimensional diagram.

[0022] Figure 2 This is a schematic cross-sectional view showing one embodiment of the hollow fiber membrane element used in the present invention.

[0023] Figure 3 This is a schematic perspective view showing one embodiment of a header cover used in the present invention.

[0024] Figure 4One embodiment of a method for connecting header covers used in the present invention is shown. Figure 4 (a) is a schematic three-dimensional diagram. Figure 4 (b) is a schematic cross-sectional view.

[0025] Figure 5 This is a schematic flow chart showing one embodiment of a filtration method using the hollow fiber membrane module unit of the present invention.

[0026] Figure 6 This is a schematic flow chart showing one embodiment of a backwashing method using the hollow fiber membrane module unit of the present invention.

[0027] Figure 7 This is a schematic flow chart showing one embodiment of the air washing method using the hollow fiber membrane module unit of the present invention.

[0028] Figure 8 This is a schematic plan view showing one embodiment of the arrangement of the side nozzles of the hollow fiber membrane element used in the present invention. DETAILED DESCRIPTION

[0029] The hollow fiber membrane module unit of the present invention is a hollow fiber membrane module unit composed of a plurality of hollow fiber membrane elements arranged in parallel with headers mounted at both ends, and is characterized in that:

[0030] The adjacent headers installed on the permeate side of the hollow fiber membrane elements are connected to each other by side seal connection covering the outer periphery of the abutment surface, and the headers at at least both ends of the row are fixed by support rods.

[0031] The hollow fiber membrane module unit of the present invention is described below with reference to the drawings.

[0032] use Figure 1 (a) is a schematic three-dimensional diagram and Figure 1 An embodiment of the hollow fiber membrane assembly unit 1 of the present invention is described with reference to the schematic three-dimensional diagram of (b). The hollow fiber membrane assembly unit 1 of the present invention is a structure in which a plurality of hollow fiber membrane elements 2 are arranged in two rows. At one end of the hollow fiber membrane element 2, a T-shaped manifold cover 3a is installed through an element joint 4a. And, at the other end, a T-shaped manifold cover 3b is installed through an element joint 4b. In addition, adjacent manifold covers 3a in the same row are connected to each other by a manifold cover joint 5a. Similarly, the manifold covers 3b are connected to each other by a manifold cover joint 5b. Here, several of the plurality of manifold covers 3a in a row are fastened to the pedestal 6 by bolts or the like. On the other hand, several of the plurality of manifold covers 3b in a row are fastened to the support rod 7 by bolts or the like.

[0033] In addition, the side nozzle 24 on the side of the hollow fiber membrane element 2 is connected to one end of the long elbow 8 bent into a 90° shape through the side nozzle joint 9. At this time, the other end of the long elbow 8 is arranged in a manner that is open in parallel with the end on the side of the manifold cover 3b in the length direction of the hollow fiber membrane element. That is, it is arranged in a manner that is open in the positive direction of the Z-axis direction. Moreover, the other end of the long elbow 8 is connected to the manifold 10 having a plurality of branch portions on the outer peripheral surface of the straight pipe through the long elbow joint 11. Here, the manifold 10 is arranged in a manner parallel to the upper part in the Z-axis direction between the manifold covers 3b arranged in two rows. At this time, the manifold 10 is embedded in the manifold base 12 that is fastened to the support rod 7 by bolts, etc. and installed on the support rod 7 in a manner spanning two rows.

[0034] In addition, a straight air pipe 13 is arranged between the hollow fiber membrane elements 2 arranged in two rows. The outer peripheral surface of the air pipe 13 is provided with the same number of through holes as the connected header cover 3a. Moreover, all of the through holes are connected to the air injection through holes 33 (see Figure 3 ) are connected via air ducts (air tubes) 14. At this time, the air tubes 13 are embedded in the air tube base 15 embedded in the air tube base 15 so as to straddle the hollow fiber membrane elements 2 arranged in two rows.

[0035] Here, the element joints 4a and 4b can be used in conjunction with seals such as O-rings and gaskets (not shown) to fluid-tightly connect the hollow fiber membrane element 2 and the end portions 32 of the branching portions of the header caps 3a and 3b (see Figure 3 ) connection, any connector can be selected. Among them, from the viewpoint of being able to fasten and connect the hollow fiber membrane element 2 and the manifold caps 3a, 3b in the axial direction so that they are in contact, and being able to suppress loosening of the fastening connection part and the damage associated therewith, it is preferred to use a V-belt connector. In addition, its material can be arbitrarily selected according to the use conditions and the required strength, but from the viewpoint of pressure resistance and corrosion resistance, SUS304 and SUS316 are preferred.

[0036] Any joints can be selected for the side nozzle joint 9 and the long elbow joint 11 as long as they can be matched with the seal (not shown) to connect the long elbow 8, the hollow fiber membrane element 2, and the manifold 10 in a liquid-tight manner. Among them, from the viewpoint of being able to allow assembly errors caused by dimensional errors of the hollow fiber membrane element 2 and the manifold cover 3a, it is preferred to use a side seal connection that can change the connection length, and suitable examples include a slot joint connection, a Victrick Joint connection (registered trademark), and a Straubcapling (registered trademark) connection. In addition, the material can be arbitrarily selected according to the usage conditions and the required strength, but from the viewpoint of pressure resistance, cost, weight, and formability, glass fiber reinforced plastic is preferred.

[0037] The pedestal 6 may be of any shape as long as it has a seat surface and bolt insertion holes on which the manifold cover 3a can be installed, and may also be provided with anchor bolt insertion holes for fixing to a floor surface, a foundation, etc. Figure 1 In the embodiment, a row of six hollow fiber membrane elements is mounted on one pedestal 6, but the shape can be appropriately changed according to the required number of hollow fiber membrane elements 2 and the number of hollow fiber membrane elements 2 can be arbitrarily selected. Figure 1 In this way, one pedestal 6 is used for one row of hollow fiber membrane elements, or one pedestal 6 may be used for two rows.

[0038] The long elbow 8 can be arbitrarily selected in shape and material as long as it can connect the hollow fiber membrane element 2 and the manifold 10. For example, metal piping, plastic piping, flexible hose, etc. can be cited as candidates. Among them, it is preferred that the plastic piping can rigidly connect the hollow fiber membrane element 2 and the manifold 10 and is cheap and lightweight. Specifically, from the viewpoint of durability, PVC (polyvinyl chloride) is particularly preferred as the material.

[0039] Here, use Figure 2An embodiment of the hollow fiber membrane element 2 used in the present invention is described with reference to a schematic cross-sectional view of . The hollow fiber membrane element 2 is composed of a hollow fiber membrane bundle composed of a plurality of hollow fiber membranes 21 and a cylindrical container 22 that encloses the hollow fiber membrane bundle. The two ends of the hollow fiber membrane bundle and the cylindrical container 22 are liquid-tightly bonded and fixed by potting materials 23a and 23b, respectively. The potting material 23a has a through hole in its length direction. In addition, in the potting material 23a, the end of the hollow fiber membrane 21 is buried and sealed in the potting material 23a. On the other hand, in the potting material 23b, the end of the hollow fiber membrane 21 is made to open at the end 26 on the permeate side of the hollow fiber membrane element 2. In addition, a side nozzle 24 is provided on the side of the potting material 23b side in the length direction of the cylindrical container 22. In the case of external pressure filtration in which filtration is performed from the outer peripheral surface of the hollow fiber membrane toward the inner peripheral direction, the pressurized raw liquid is introduced into the hollow fiber membrane element 2 from the through hole of the potting material 23a at the end 25 on the raw liquid side, and the permeate filtered by the hollow fiber membrane 21 is discharged from the end 26 of the potting material 23b. On the other hand, the unfiltered concentrated liquid, the air for washing, etc. are discharged from the side nozzle 24.

[0040] Here, use Figure 3 An embodiment of the manifold covers 3a and 3b used in the present invention is described with reference to a schematic three-dimensional view. The manifold covers 3a and 3b are T-shaped and open in three directions, namely, the end 31 of the straight pipe portion and the end 32 of the branch portion. In addition, a through hole 33 for air injection is provided on the side of the manifold cover 3a. The through hole 33 for air injection is preferably processed by appropriately cutting threads or the like so as to be easily connected to the air duct 14. In addition, the ends on the opposite side of the ends 32 of the branch portions of the manifold covers 3a and 3b are flat in shape. By providing a bolt hole 34 here and using the hole, it is possible to fasten and connect with the pedestal 6 and the support rod 7 by bolts or the like. In addition, the material is preferably a plastic that can be produced in a complex shape by injection molding, is inexpensive, and is lightweight. Among them, PVC is particularly preferred from the viewpoints of durability, weather resistance, and strength.

[0041] Here, use Figure 4 (a) is a schematic three-dimensional diagram and Figure 4 One embodiment of the method for connecting the header covers used in the present invention is described with reference to the schematic cross-sectional view of (b). Figure 4In (a) and (b), the description is made by taking the manifold cover 3b as an example, but the same description can be applied to the manifold cover 3a. Adjacent manifold covers 3b are arranged so that the ends 31 of their straight tube portions face each other, and the manifold cover joints 5b are provided and connected in a manner covering the outer periphery of their abutting surfaces. A rubber ring 16 serving as a sealing member for ensuring liquid tightness needs to be provided between the manifold cover 3b and the manifold cover joint 5b. From the viewpoint of being able to tolerate assembly errors caused by dimensional errors of the hollow fiber membrane element 2, the manifold cover 3b, etc., the manifold cover joint 5b uses a side seal connection that can change the connection length. That is, as Figure 4 As shown in (b), if a side seal connection is used, connection can be achieved even when there is a gap between the end portions 31 of the straight pipe portions of adjacent collecting pipe covers 3b. Therefore, as long as it is within the range of the connectable distance, the increase or decrease in the gap distance caused by assembly error can be allowed.

[0042] Here, the side seal connection refers to a shell-type connection that seals by covering the outer periphery of the abutment surface of the connected pipe, as represented by the Victrick Connector (registered trademark) manufactured by Victrick Corporation. Among the connection forms, there are a groove type with a groove on the pipe, a shoulder type with a convex portion, a ring type, a Strawcap Ring (registered trademark), etc. Among them, as the side seal connection used in the present invention, a groove type connection in which a groove is provided on the outer periphery of the connection portion of the manifold cover is preferred because it is excellent in the ease of forming the manifold cover as the connection object and the cost, and the allowable range of the assembly length and angle is wide. In addition, the material of the manifold cover joint 5b can be arbitrarily selected according to the use conditions and the required strength, but from the viewpoints of pressure resistance, cost, weight, and formability, glass fiber reinforced plastic is preferred.

[0043] However, when the connection is made only by the side seal connection, the header cover 3b is displaced in the length direction of the straight pipe portion (the direction of the arrow 35 in the figure) by the load caused by the pressure and liquid flow during the operation of the hollow fiber membrane module unit. That is, the header cover 3b moves due to the load in the direction of separation and gap expansion. If the header cover 3b moves in this way, the header cover 3b itself, the hollow fiber membrane element 2 connected to the header cover 3b, and other components may be deformed and damaged.

[0044] The hollow fiber membrane assembly unit 1 of the present invention is characterized in that it is possible to ensure ease of assembly by using a side seal connection while suppressing displacement and deformation of the manifold cover 3b by using a support rod 7. Specifically, the support rod 7 is provided along a flat surface on the opposite side of the end 32 of the branch portion of the manifold cover 3b in a manner spanning adjacent manifold covers 3b. Furthermore, the manifold cover 3b and the support rod 7 are fastened and connected by bolts or the like by using bolt holes 34. Thus, adjacent manifold covers 3b can be rigidly connected to each other via the support rod 7, and displacement in the direction of arrow 35 (movement direction of the manifold cover) can be suppressed.

[0045] At this time, at least the headers at both ends of the row of headers need to be fastened to the support rods 7. On the other hand, regarding the fastening of the headers other than the two ends to the support rods, the fastening locations may be appropriately determined in consideration of the size of the hollow fiber membrane module, its assembling properties, and cost, but from the viewpoint of damage suppression, it is preferred that all headers are fastened to the support rods 7. That is, the connection between adjacent headers is preferably performed by side seal connection covering the outer periphery of the abutment surface and connection by the support rods.

[0046] Here, in Figure 4 In (a), the support rod 7 has a length that spans across a plurality of header covers 3b, but the length is not limited as long as the displacement of the header covers 3b can be suppressed. As long as a fastened connection state that can suppress displacement can be achieved, for example, the support rod 7 can be provided for each connection portion of adjacent header covers 3b. In addition, the number, shape, and arrangement position of the support rod 7 can be arbitrarily selected as long as the displacement, deformation, and leakage of the connection portion of the header covers 3b can be suppressed.

[0047] exist Figure 4 In (a), two support rods 7 are arranged at both ends perpendicular to the longitudinal direction of the straight pipe portion relative to the flat surface of the upper portion of the header cover 3b. From the viewpoint of suppressing displacement of the header cover 3b and preventing leakage at the connection portion, it is preferable to Figure 1 As shown in (a) of FIG. 1 , the support rod 7 is located on the opposite side of the hollow fiber membrane element 2 via the header cover 3 b.

[0048] From the same viewpoint, it is preferable to provide a plurality of support rods 7, preferably to provide them in two rows with respect to the header cover. In this case, it is preferable to provide them evenly in the circumferential direction of the connection portion.

[0049] If Figure 4The configuration in which two support rods 7 are arranged at both ends of the flat surface of the upper portion of the manifold cover 3b as shown in (a) above can ensure the effect of suppressing the displacement of the manifold cover 3b and preventing leakage of the connection portion while using one support rod 7 as the seat surface of the manifold base 12, which is structurally preferred. In addition, if such a structure is used, it can be as follows Figure 4 As in (a), the support rod 7 is made into a simple prism shape, which is preferred from the perspective of cost, handling, and ease of assembly. Figure 4 As shown, it is preferable to fasten the support rod 7 and the header cover 3 b in direct contact with each other so as to suppress displacement by the friction between the two.

[0050] The material of the support rod 7 can be arbitrarily selected from metal, plastic, fiber reinforced plastic, etc. according to the usage conditions and required strength, but from the viewpoint of strength and creep resistance, carbon steel and carbon fiber reinforced plastic are preferred, from the viewpoint of corrosion resistance, stainless steel is preferred, and from the viewpoint of lightness, carbon fiber reinforced plastic is preferred.

[0051] In addition, Figure 4 In (a) and (b), a method of fixing the manifold cover 3b using the support rod 7 is shown. However, in fixing the manifold cover 3a, the pedestal 6 plays the same role as the support rod 7 and the same effect can be obtained.

[0052] Here, arrow 40 is used to Figures 5 to 7 The flow of fluid during various operations performed using the hollow fiber membrane module unit 1 of the present invention will be described below.

[0053] First, use Figure 5 A schematic diagram is used to illustrate an embodiment of filtration using the hollow fiber membrane assembly unit 1 of the present invention. The raw liquid introduced from the end 31 of the straight tube portion of the manifold cover 3a closest to the end flows in the straight tube portion of the connected and communicated manifold cover 3a, while partially branching and flowing into the hollow fiber membrane element 2 from the end 25 on the raw liquid side of the hollow fiber membrane element 2. The raw liquid flowing into the hollow fiber membrane element 2 is fully filtered from the outer peripheral surface of the hollow fiber membrane 21 toward the inner periphery. At this time, impurities adhere to the outer peripheral membrane surface, and the permeate is discharged from the end 26 on the permeate side into the manifold cover 3b. The permeate flowing into each manifold cover 3b is gathered in the straight tube portion of the connected and communicated manifold cover 3b, flows in the direction of the manifold cover 3b closest to the end, and is discharged from the end.

[0054] When the entire amount of filtration is performed, the flow path connected to the side nozzle 24 (not shown) of the hollow fiber membrane element 2 is not used and is sealed.

[0055] In addition, Figure 5In the figure, six hollow fiber membrane elements are shown in one row to illustrate the flow, but in actual operation, filtration is performed in two rows respectively, and the number of hollow fiber membrane elements can be arbitrarily selected by changing the number of connected elements in accordance with the required processing amount.

[0056] In addition, Figure 5 In the figure, the flow of the raw liquid introduced from one end of the manifold cover 3a and the permeate discharged from one end of the manifold cover 3b is shown. In this case, it is sufficient to provide a cover or the like at the other end of the manifold covers 3a and 3b to maintain liquid tightness. In addition, it is also possible to appropriately introduce the raw liquid from both ends of the manifold cover and discharge the permeate in consideration of the coordination with the external piping (not shown). As for the connection between the manifold covers 3a and 3b and the external piping, the manifold cover joint (i.e., side seal connection) can be used in the same manner as the connection between the manifold covers, or the side seal connection part can be converted into a flange for connection. It can be appropriately selected according to the condition of the external piping.

[0057] Next, use Figure 6 A schematic diagram of a hollow fiber membrane module unit 1 of the present invention is used to illustrate a method for backwashing. Figure 5 The permeate obtained during the operation is used as a cleaning liquid, and the cleaning liquid is introduced from the end of the manifold cover 3b closest to the end. The introduced cleaning liquid flows in the straight pipe part of the connected and communicated manifold cover 3b while partially branching and flowing into the hollow fiber membrane element 2. The cleaning liquid flowing into the hollow fiber membrane element 2 passes from the inner peripheral surface of the hollow fiber membrane 21 to the outer periphery. At this time, the cleaning liquid peels off the impurities attached to the outer peripheral membrane surface while being discharged to the outside of the hollow fiber membrane 21. The cleaning liquid containing impurities discharged to the outside of the hollow fiber membrane 21 flows from the side nozzle 24 of the hollow fiber membrane element 2 to the long elbow 8 and the manifold 10, gathers in the connected and communicated manifold 10, and is discharged from the end of the manifold 10 closest to the end. When performing this backwash, the flow path connected to the manifold cover 3a is not used and is sealed.

[0058] exist Figure 6 , the flow of the cleaning liquid introduced from one end of the header cover 3b and discharged from one end of the manifold 10 is shown. In this case, a cover or the like is provided at the other end of the header cover 3b and the manifold 10 to maintain liquid tightness. In addition, the cleaning liquid can be appropriately introduced from both ends of the header cover 3b and discharged from both ends of the manifold 10 in consideration of coordination with external piping (not shown).

[0059] In addition, the cleaning liquid flows into the manifold 10 not only from the one row of hollow fiber membrane elements shown in the figure but also from the other row of hollow fiber membrane elements, and the cleaning liquids of the two rows of hollow fiber membrane elements are collected and discharged. Figure 6In the figure, the manifold 10 has a branch number and a length that can be connected to 6 (3 × 2 rows) hollow fiber membrane elements, but the branch number can be appropriately selected according to the required number of hollow fiber membrane elements and assembly properties. However, regarding the number of branches of the manifold 10, considering the weight of the manifold itself to be within the range that can be handled by hand, the number of connection points between the manifolds, and the required number of manifold bases 12, the number of branches of 4 to 8 (2 to 4 × 2 rows) is preferred.

[0060] In addition, the manifolds 10 are connected to each other by a manifold joint 17. As long as the manifold joint 17 can be used in conjunction with a seal (not shown) such as an O-ring or a gasket to connect the manifolds 10 to each other in a liquid-tight manner, any joint can be selected, but from the viewpoint of being able to fasten and connect the manifolds 10 to each other in the axial direction so that they are in contact, and being able to suppress loosening of the fastening portion and the accompanying damage, it is preferred to use a V-belt connector. In addition, the material can also be arbitrarily selected according to the use conditions and the required strength, but from the viewpoint of pressure resistance and corrosion resistance, SUS304 and SUS316 are preferred.

[0061] Finally, use Figure 7 A method for performing air washing using the hollow fiber membrane assembly unit 1 of the present invention is described with reference to a schematic diagram. When performing air washing, the hollow fiber membrane element 2 is first filled with a stock solution or a permeate, and then air is introduced. The air introduced from the end of the air pipe 13 flows in the air pipe 13 while partially branching to a plurality of holes provided on the side of the cylindrical portion, and flows into the manifold cover 3a from the air injection through hole 33 through the air conduit 14. The air that has flowed in flows into the hollow fiber membrane element 2 from the branching portion of the manifold cover 3a. The air that has flowed in rises along the outer peripheral surface of the hollow fiber membrane 21, while peeling off the impurities attached to the membrane surface, and flows through the side nozzle 24, the long elbow 8, and the manifold 10, and is collected in the connected and communicated manifold 10, and is discharged from the end of the manifold 10 closest to the end. When performing this air washing, the flow path connected to the end 31 of the straight pipe portion of the manifold covers 3a and 3b is not used and is sealed.

[0062] As mentioned above, use Figures 5 to 7 The flow of fluid during each operation of the hollow fiber membrane module unit 1 of the present invention is shown. Figures 5 to 7 The diagram is only used to show the flow in an easy-to-understand way, and does not accurately show the actual orientation and coordination of the components. For the actual orientation, configuration, and coordination of the components, please refer to Figure 1 .

[0063] Here, use Figure 8An embodiment of the configuration of the side nozzles 24 of the hollow fiber membrane element 2 used in the present invention is described with reference to a schematic top view. In the present invention, the side nozzles 24 provided in the hollow fiber membrane elements 2 arranged in two rows are arranged toward between the rows in order to be connected to the manifold 10. At this time, the paired side nozzles 24 in the two rows are preferably not arranged in a manner opposite to each other but arranged in directions staggered from each other as shown in the figure. The reason is that the long elbow 8 connected to the side nozzle 24 via the side nozzle joint 9 can be efficiently arranged in the gap between the two rows, which is preferred from the perspective of space saving. Although it also depends on the membrane diameter and the size of the component, by adopting such a configuration, the installation efficiency (membrane area per unit area of ​​the component installation) can be increased to more than twice compared to when the side nozzles 24 are arranged in a manner opposite to each other. 625m 2 / m 2 In addition, by adopting such a configuration, the branching parts of the manifold 10 connected to the long elbow 8 can be arranged at equal intervals, which is also preferable from the viewpoint of water flow performance and assembling properties.

[0064] Industrial Applicability

[0065] According to the present disclosure, it is possible to provide a hollow fiber membrane module unit that can tolerate dimensional errors of the members constituting the hollow fiber membrane module unit and can suppress displacement and deformation acting on the header cap while ensuring good assemblability.

[0066] While the present invention has been described in detail and with reference to specific embodiments, it will be apparent to one skilled in the art that various changes and modifications can be added without departing from the spirit and scope of the present invention.

[0067] This application is based on the Japanese patent application (Japanese Patent Application No. 2021-134671) filed on August 20, 2021, the contents of which are incorporated herein by reference.

[0068] Description of Reference Numerals

[0069] 1 Hollow fiber membrane module unit

[0070] 2 Hollow fiber membrane elements

[0071] 3a, 3b Manifold cover

[0072] 4a, 4b Component connectors

[0073] 5a, 5b Manifold cover connector

[0074] 6 pedestals

[0075] 7 Support rod

[0076] 8 Long elbow

[0077] 9 Side nozzle connector

[0078] 10 Manifold

[0079] 11 Long elbow connector

[0080] 12 Manifold base

[0081] 13 Air pipe

[0082] 14 Air duct

[0083] 15 Air pipe base

[0084] 16 Rubber ring

[0085] 17 Manifold connector

[0086] 21 Hollow fiber membrane

[0087] 22 cylindrical containers

[0088] 23a, 23b Potting material

[0089] 24 Side Nozzles

[0090] 25 End of the hollow fiber membrane element on the raw liquid side

[0091] 26 End of the permeate side of the hollow fiber membrane element

[0092] 31 End of the straight pipe section of the header cover

[0093] 32 End of the branch section of the header cover

[0094] 33 Through hole for air injection

[0095] 34 Bolt holes

[0096] 35 Arrow

[0097] 40 Arrow

Claims

1. A hollow fiber membrane module unit, comprising a plurality of hollow fiber membrane elements arranged in parallel and having headers mounted at both ends, characterized in that: The plurality of header covers mounted on the end of the hollow fiber membrane element on the raw liquid side are fixed to a pedestal. The adjacent headers installed at the ends of the hollow fiber membrane elements on the permeate side are connected to each other by side sealing connection covering the outer periphery of the abutment surface, and the headers installed at the ends on the permeate side at least at both ends of the row are fixed by support rods. The support rod is located on the opposite side of the hollow fiber membrane element across the header cover. A manifold base is fixed to the support rod in a manner spanning the column, In the two rows of side nozzles arranged in the hollow fiber membrane elements arranged in two rows, the pairs of side nozzles are arranged in staggered directions with respect to each other in such a manner that the branch portions of the manifold connected to the side nozzles connecting the hollow fiber membrane elements and the long elbows of the manifold are arranged at equal intervals.

2. The hollow fiber membrane assembly unit according to claim 1, characterized in that: The adjacent headers attached to the ends of the hollow fiber membrane elements on the permeate side are connected to each other by side seal connection covering the outer periphery of the abutment surface and connection by support rods.

3. The hollow fiber membrane module unit according to claim 1 or 2, characterized in that: The adjacent headers attached to the ends of the hollow fiber membrane elements on the raw liquid side are connected to each other by side seal connection covering the outer periphery of the abutment surface and connection by a pedestal.

4. The hollow fiber membrane module unit according to claim 1 or 2, characterized in that: The side seal connection is a groove-type connection in which a groove is provided on the outer periphery of the connection portion of the header cover.

5. The hollow fiber membrane module unit according to claim 1 or 2, characterized in that: The support bars are provided in two rows with respect to the header cover.

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