JP6628352B2 - Hollow fiber membrane module - Google Patents

Description

  The present invention relates to a hollow fiber membrane module provided with a hollow fiber membrane bundle in which a plurality of hollow fiber membranes are bundled, and more particularly to a hollow fiber membrane module provided with a rectifying cylinder.

  In fields such as semiconductor manufacturing and the food industry, hollow fiber membrane modules in which a hollow fiber membrane bundle in which a plurality of hollow fiber membranes are bundled are housed in a casing are used for applications such as gas-liquid absorption, degassing, and filtration. I have. In this hollow fiber membrane module, the ends of each hollow fiber membrane are fixed with a potting material and integrated, and a hollow fiber membrane made of a porous fluororesin is widely used. BACKGROUND ART Hollow fiber membrane modules using hollow fiber membranes are used in various fields because they have a large membrane area and can be downsized.

  In a general hollow fiber membrane module, a nozzle through which a liquid can enter and exit is provided on a side portion of a casing. Then, when performing the filtration treatment by the external pressure filtration method, the liquid flows from the nozzle, the liquid permeates from the outer surface of each hollow fiber membrane, and the liquid that has passed through the hollow part of each hollow fiber membrane is the hollow fiber membrane module. Flows out of a pipe provided at the end of the pipe. In addition, when performing the filtration treatment by the internal pressure filtration method, liquid flows in from a conduit provided at the end of the hollow fiber membrane module, and the liquid passes through the hollow part of each hollow fiber membrane, and the liquid is removed. During the passage, the liquid that has oozed from the outer surface of each hollow fiber membrane flows out of the nozzle.

  Here, when performing the filtration treatment of the external pressure filtration method as described above, if the liquid directly hits the hollow fiber membrane bundle arranged near the nozzle, the hollow fiber membrane may be damaged by the force of the flow of the liquid. There is. In addition, even when performing the filtration treatment of the internal pressure filtration method, when the supply amount of the liquid increases, water flows in the hollow fiber membrane module at a high speed, whereby the hollow fiber membrane vibrates violently. This vibration may cause the hollow fiber membranes to be rubbed against each other, or a large load may be applied to the vicinity of the bonded portion of the hollow fiber membranes to damage the hollow fiber membranes.

  Therefore, as a method for preventing the damage of the hollow fiber membrane due to such a water flow, Patent Documents 1 to 3 and the like disclose a method of providing a rectifying cylinder for protection between a casing of a hollow fiber membrane module and a hollow fiber membrane bundle. Proposed.

JP 2012-45453 A JP-A-11-90182 JP 2010-166970A

  Here, in Patent Literature 1, for example, the rectifying cylinder is fixed to the casing by sandwiching a flange provided on the rectifying cylinder between two cylinder members constituting the casing. Further, in Patent Document 2, the rectifying cylinder is fixed by fitting a projection provided on the rectifying cylinder into a groove provided in the casing.

  However, when the rectifying cylinder is fixed as in Patent Document 1, two circumferential directions are provided between one surface of the flange and the cylindrical member and between the other surface of the flange and the cylindrical member. However, there is a problem that a minute gap is generated and dirt adheres to the gap. In addition, when the rectifying cylinder is fixed as in Patent Document 2, the protruding portion is fitted into the recess, so that a small gap is generated in the fitting portion as in Patent Document 1, and the gap is formed in the gap. On the other hand, there is a problem that dirt adheres. That is, in the method of fixing the flow straightening tube described in Patent Literature 1 and Patent Literature 2, dirt or the like contained in the liquid easily adheres to the fixing portion, and there is a problem in terms of sanitation when filtering food or the like. There are cases.

  On the other hand, a hollow fiber membrane module is manufactured by bundling a plurality of hollow fiber membranes to form a hollow fiber membrane bundle, housing the hollow fiber membrane bundle in a casing, and bonding and fixing both ends with a potting material. At this time, the hollow fiber membrane bundle is not arranged at the center of the casing, and there is a possibility that the processing capacity varies.

  Therefore, as a method of disposing the hollow fiber membrane bundle at the center of the casing, for example, a method of bonding a ring-shaped member to the inner side surface of the end of the casing and inserting the end of the hollow fiber membrane bundle into the center of the ring-shaped member Can be considered.

  However, the use of the ring member as described above has a problem that the number of parts increases and the cost increases.

  The present invention has been made in view of such problems, and it is possible to arrange a hollow fiber membrane bundle in the center of a casing without increasing costs, and furthermore, there is a problem of hygiene as described above. It is an object of the present invention to provide a hollow fiber membrane module that can fix a rectifying cylinder without causing the occurrence of the bleeding.

  A hollow fiber membrane module according to the present invention includes a hollow fiber membrane bundle in which a plurality of hollow fiber membranes are bundled, and a tubular casing that accommodates the hollow fiber membrane bundle and has at least one nozzle through which liquid can enter and exit. And, at the end of the hollow fiber membrane bundle on the side where the nozzle is formed, between the bonding portion formed by bonding and fixing the hollow fiber membranes to each other, and between the opening of the nozzle on the inner surface side of the casing and the hollow fiber membrane bundle. A rectifying cylinder formed in a cylindrical shape so as to surround the outer periphery of the hollow fiber membrane bundle, wherein the rectifying cylinder is arranged from the position of the nozzle opening toward one end of the hollow fiber membrane bundle closer to the nozzle. It has an extended portion that regulates the movement of the hollow fiber membrane bundle in the direction of the inner surface of the casing, and the extended portion is joined to the side surface of the adhesive portion and the inner surface of the casing. And

  Further, in the hollow fiber membrane module of the present invention, when the nozzle is formed with the side on which the nozzle is formed upright, one end of the rectifying cylinder that is not bonded to the bonding portion is positioned at the upper end position of the opening of the nozzle. It can be a position between the upper end position and a position extending in the longitudinal direction of the casing by the length of the inner diameter of the opening.

  Further, in the hollow fiber membrane module of the present invention, one end of the rectifying cylinder that is not bonded to the bonding portion may be the upper end position of the opening of the nozzle.

  In the hollow fiber membrane module of the present invention, one end of the rectifying cylinder that is not bonded to the bonding portion is located above the upper end position of the nozzle opening, and the other end is not bonded to the bonding portion of the rectifying cylinder. May be provided on a part of the outer peripheral side surface of the rectifying cylinder.

  Further, in the hollow fiber membrane module of the present invention, the extended portion of the flow regulating tube and the casing can be joined in a range from a lower end position of the opening of the nozzle to one end of the casing.

  Further, in the hollow fiber membrane module of the present invention, an annular concave-convex structure can be formed on the inner surface joined to the adhesive portion of the rectifying cylinder.

  Further, in the hollow fiber membrane module of the present invention, finer irregularities can be formed on the surface of the annular uneven structure than the annular uneven structure.

  Further, in the hollow fiber membrane module of the present invention, a plurality of through holes can be formed in the rectifying cylinder.

  Further, in the hollow fiber membrane module of the present invention, the through hole can be formed in a portion other than the surface facing the opening of the nozzle.

  In the hollow fiber membrane module of the present invention, the through holes may be formed so that the number thereof gradually decreases toward one end of the hollow fiber membrane bundle.

  According to the hollow fiber membrane module of the present invention, the flow regulating cylinder includes the extension portion extending from the position of the opening of the nozzle toward one end of the hollow fiber membrane bundle. Since the movement of the hollow fiber membrane bundle in the inner surface direction of the casing is restricted by the extending portion, the hollow fiber membrane bundle can be arranged at the center of the casing without providing a new member. In addition, since the rectifying cylinder is fixed to the casing by joining the extending portion of the rectifying cylinder to the side surface of the bonding portion and the inner surface of the casing, there is a problem of hygiene in the conventional fixing method of the rectifying cylinder. It does not occur.

Sectional drawing which shows the structure of one Embodiment of the hollow fiber membrane module of this invention. Sectional perspective view showing the configuration of one embodiment of the hollow fiber membrane module of the present invention. Enlarged view of the contact surface between O-ring, cap and adhesive Diagram showing end face of hollow fiber membrane bundle Perspective view of the first rectification cylinder and the second rectification cylinder Perspective view of a molded member constituting the first rectifying cylinder and the second rectifying cylinder The figure for demonstrating the preferable length of a 1st straightening pipe. The figure for demonstrating the preferable length of a 2nd straightening pipe. Diagram showing simulation model of hollow fiber membrane module The figure which shows the simulation result of the velocity of the water which flows in a hollow fiber membrane module The figure which shows the simulation result of the velocity of the water which flows in a hollow fiber membrane module The figure which shows the simulation result of the velocity of the water which flows in a hollow fiber membrane module Perspective view and top view showing another embodiment of the flow straightening tube Exploded perspective view of a hollow fiber membrane module The figure which shows the schematic structure of the filtration apparatus using one Embodiment of the hollow fiber membrane module of this invention.

  Hereinafter, an embodiment of the hollow fiber membrane module of the present invention will be described with reference to the drawings. The hollow fiber membrane module of the present embodiment is used in various fields such as water and sewage, food industry, general industry, medical care, and physics and chemistry. FIG. 1 is a longitudinal sectional view of the hollow fiber membrane module of the present embodiment, and FIG. 2 is a longitudinal sectional perspective view of the hollow fiber membrane module of the present embodiment.

  As shown in FIGS. 1 and 2, the hollow fiber membrane module 1 of the present embodiment has a hollow fiber membrane bundle 3 in which a plurality of hollow fiber membranes 2 are bundled, and a tubular fiber housing the hollow fiber membrane bundle 3. And a casing 5. In FIG. 2, the portion of the hollow fiber membrane bundle 3 (including a part of the bonding portion 20) is indicated by a two-dot chain line.

  At the openings at both ends of the casing 5, pipe connection caps 10, 11 in which pipelines 10 a, 11 a to which the pipes are connected are provided, respectively. 5 is fixedly mounted. The nuts 13 are screwed into male threads formed on both side surfaces of both ends of the casing 5, and the nut 13 is tightened, so that both ends of the casing and the caps 10, 11 are formed by O-rings 12 arranged in grooves of the caps 10, 11. The gap is sealed.

  FIG. 3 is an enlarged view of a contact surface between the O-ring 12 and the caps 10 and 11 and the bonding portion 20. The bonding section 20 is for bonding and fixing the hollow fiber membranes 2 to each other by a potting material at the end of the hollow fiber membrane bundle 3. As the potting material, a polymer material such as an epoxy resin, a vinyl ester resin, a urethane resin, an unsaturated polyester resin, an olefin polymer, a silicone resin, and a fluorine-containing resin is preferable, and any of these polymer materials may be used. Alternatively, a plurality of polymer materials may be used in combination. Further, the potting material needs to have a pressure resistance that can withstand a pressure difference between the primary side and the secondary side generated by pressurization at the time of filtration, and for that purpose, it needs to have an appropriate strength and elastic modulus. is there.

  As shown in FIG. 3, an annular groove 20a is formed on an end surface of the bonding portion 20 facing the cap 10, and an annular groove 10b is formed on a part of the surface of the cap 10 facing the end surface. The O-ring 12 is accommodated between the annular groove 20 a formed on the end face of the bonding portion 20 and the annular groove 10 b formed on a part of the surface of the cap 10. Is liquid-tight.

  More specifically, as shown in FIGS. 1 to 3, the inner surface of the cap 10 has a tapered surface whose diameter gradually increases as approaching the casing 5. The end surface is configured to be continuous with only the peripheral surface of the O-ring 12 therebetween. Although FIG. 2 is an enlarged view of the cap 10 side, the same configuration is applied to the cap 11 side.

  The casing 5 is formed from two tubular members, a first tubular member 51 and a second tubular member 52. The first tubular member 51 and the second tubular member 52 are respectively provided with a first nozzle 51a and a second nozzle 52a through which liquid can enter and exit. The first tubular member 51 and the first nozzle 51a are integrally formed, and the second tubular member 52 and the second nozzle 52a are also integrally formed. The first nozzle 51a and the second nozzle 52a are provided on a side portion of the casing 5, and are provided so as to protrude in a direction orthogonal to the longitudinal direction.

  The length of the casing 5 is about 800 mm, and the inner diameter is about 230 mm.

  The first tubular member 51 and the second tubular member 52 are joined to each other at an intermediate position in the longitudinal direction (the cylinder axis direction) of the casing 5. The joining position between the first tubular member 51 and the second tubular member 52 may be any position as long as it is between one end and the other end of the casing 5, but is preferably the center position.

  Also, the first tubular member 51 and the second tubular member 52 are such that the joint portion 51b of the first tubular member 51 is located on the inner circumferential side, and the joined portion 52b of the second tubular member 52 is the outer circumferential surface of the cylinder. It is combined and joined in the state located on the side. The joining portion 51b of the first tubular member 51 and the joining portion 52b of the second tubular member 52 are adhered by a solvent or the like.

  FIG. 4 shows the end face in a state before the hollow fiber membrane bundle 3 is accommodated in the casing 5 and the caps 10 and 11 are attached, and a partially enlarged view thereof. As shown in FIG. 4, on both end surfaces of the hollow fiber membrane bundle 3, hollow fiber membranes 2 having openings P are arranged, and the space between the hollow fiber membranes 2 is filled with a potting material to form an adhesive portion 20. I have.

  With the above configuration, the fluid flowing from the pipes 10a and 11a of the caps 10 and 11 passes only through the hollow portions of the hollow fiber membranes 2 without leaking between the hollow fiber membranes 2 by the bonding portion 20. Then, the fluid that has oozed from the outer surface of each hollow fiber membrane 2 between the two bonding portions 20 located at both ends flows out from the first nozzle 51a and the second nozzle 52a. Alternatively, the fluid flowing from the first nozzle 51a and the second nozzle 52a penetrates from the outer surface of each hollow fiber membrane 2 between the bonding portions 20 at both ends, and flows through the hollow portion of each hollow fiber membrane 2. Flows out of the conduits 10a, 11a of the caps 10, 11.

  As the hollow fiber membrane 2, a microfiltration membrane, an ultrafiltration membrane, or the like can be used. The material of the hollow fiber membrane is not particularly limited, and polysulfone, polyethersulfone, polyacrylonitrile, polyimide, polyetherimide, polyamide, polyetherketone, polyetheretherketone, polyethylene, polypropylene, poly (4-methylpentene), ethylene -Vinyl alcohol copolymer, cellulose, cellulose acetate, polyvinylidene fluoride, ethylene-tetrafluoroethylene copolymer, polytetrafluoroethylene, and the like, and a composite material thereof can also be used.

  The inner diameter of the hollow fiber membrane 2 is 50 μm to 3000 μm, and preferably 500 μm to 2000 μm. If the inner diameter is small, the pressure loss increases and the filtration is adversely affected. Therefore, the inner diameter of the hollow fiber membrane 2 is preferably set to 50 μm or more. When the inner diameter is increased, it is difficult to maintain the shape of the membrane during spinning.

  The number of hollow fiber membranes 2 in the hollow fiber membrane bundle 3 is, for example, about 2500 when the inner diameter of the casing 5 is 150 mm, and is about 5000 when the inner diameter of the casing 5 is 250 mm.

  Returning to FIGS. 1 and 2, a first rectifying cylinder 6 and a second rectifying cylinder 7 are attached to both ends of the hollow fiber membrane bundle 3, respectively. FIG. 5 is a perspective view of the first rectifying cylinder 6 and the second rectifying cylinder 7. As shown in FIG. 5, the first rectifying cylinder 6 and the second rectifying cylinder 7 are formed in a tubular shape.

  As shown in FIGS. 1 and 2, the first rectifying cylinder 6 is provided between the opening of the first nozzle 51 a on the inner side surface 5 a side of the casing 5 and the hollow fiber membrane bundle 3, Numerals 7 are provided between the opening of the second nozzle 52a on the inner surface 5a side of the casing 5 and the hollow fiber membrane bundle 3, and are provided so as to surround the outer periphery of the hollow fiber membrane bundle 3, respectively.

  When the liquid flows from the first nozzle 51a and the second nozzle 52a, the first rectifying cylinder 6 and the second rectifying cylinder 7 cause the hollow fiber membrane 2 to be impacted by the liquid directly hitting the hollow fiber membrane bundle 3. Can be prevented from being damaged. When the liquid flows in from the pipe 10a of the cap 10 or the pipe 11a of the cap 11 and is discharged from the first nozzle 51a or the second nozzle 52a, the liquid passes through the hollow portion of each hollow fiber membrane 2. The discharged liquid is discharged from the first nozzle 51a or the second nozzle 52a while being detoured by the first rectifying cylinder 6 and the second rectifying cylinder 7, and the occurrence of local high-speed liquid flow is suppressed. Thus, damage to the hollow fiber membrane 2 can be suppressed.

  Further, the first straightening cylinder 6 includes an extension 6a extending from the position of the opening of the first nozzle 51a toward one end of the hollow fiber membrane bundle 3 closer to the first nozzle 51a. The extending portion 6 a regulates the movement of the hollow fiber membrane bundle 3 in the inner surface direction of the casing 5, and is joined to the side surface of the bonding portion 20 and the inner surface of the casing 5. The extending portion 6a of the first rectifying cylinder 6 and the inner surface of the casing 5 are joined by a solvent or the like.

  Similarly to the first rectifying tube 6, the second rectifying tube 7 also extends from the position of the opening of the second nozzle 52a toward one end of the hollow fiber membrane bundle 3 closer to the second nozzle 52a. An installation part 7a is provided. The extending portion 7 a regulates the movement of the hollow fiber membrane bundle 3 in the inner surface direction of the casing 5, and is joined to the side surface of the bonding portion 20 and the inner surface of the casing 5. The extended portion 7a of the second straightening cylinder 7 and the inner surface of the casing 5 are joined by a solvent or the like.

  In the hollow fiber membrane module 1 of the present embodiment, as described above, the movement of the hollow fiber membrane bundle 3 in the inner surface direction of the casing 5 is restricted by the extension portions 6a and 7a of the first and second rectifying cylinders 6 and 7. The hollow fiber membrane bundle 3 can be arranged at the center of the casing 5 without providing a new member. Also, the first and second rectifying cylinders 6 and 7 are joined to the casing 5 by joining the extended portions 6a and 7a of the first and second rectifying cylinders 6 and 7 to the side surface of the bonding portion 20 and the inner surface of the casing 5. Since it is fixed, there is no problem of hygiene as in the conventional method of fixing the rectifying cylinder.

  Further, as shown in FIG. 5, an annular concave-convex structure 6b is formed on the inner surface of the first rectifying cylinder 6 that is joined to the bonding portion 20 of the extension portion 6a. The annular concavo-convex structure 6b is formed so that the cross-sectional shape becomes a sawtooth shape. The annular concavo-convex structure 6b can increase the bonding area between the extending portion 6a and the bonding portion 20, and can obtain higher bonding strength. Further, it is desirable to form finer irregularities on the inner side surface of the extending portion 6a than the above-mentioned annular concave-convex structure 6b. Specifically, it is desirable to apply satin finish to the inner surface of the extension 6a. Thereby, the adhesive strength between the extending portion 6a and the adhesive portion 20 can be further improved.

  Also, as for the extending portion 7a of the second rectifying cylinder 7, an annular uneven structure 7b is formed on the inner surface to be joined to the bonding portion 20, similarly to the extending portion 6a of the first rectifying cylinder 6. The annular concavo-convex structure 7b can increase the bonding area between the extension portion 7a and the bonding portion 20, and can obtain higher bonding strength. Further, it is desirable to apply satin finish to the inner side surface of the extension 7a.

  Further, as shown in FIG. 5, a plurality of through holes 30 are formed in the first rectifying cylinder 6 and the second rectifying cylinder 7. The through-hole 30 in the first rectifying cylinder 6 is formed in a portion other than the surface facing the opening of the first nozzle 51a, and the through-hole 30 in the second rectifying cylinder 7 is formed in a portion other than the surface facing the opening of the second nozzle 52a. Is formed at the location of. In the present embodiment, the first rectifying cylinder 6 and the second rectifying cylinder 7 are formed by combining two semi-cylindrical shaped members 6c and 7c as shown in FIG. A group of holes 30 is formed at two opposing positions in the first rectifying cylinder 6 and the second rectifying cylinder 7.

  Further, the group of through holes 30 formed in the first rectifying cylinder 6 and the second rectifying cylinder 7 is formed such that the number thereof gradually decreases toward one end of the hollow fiber membrane bundle 3. Since the flow rate of the liquid becomes faster toward one end of the hollow fiber membrane bundle 3, the flow rate of the liquid can be further restricted by reducing the number of the through holes 30. In the present embodiment, since the diameter of each through hole 30 is the same, the number is gradually reduced toward one end of the hollow fiber membrane bundle 3 as described above. The same effect can be obtained even if the diameter of the through hole 30 is gradually reduced toward one end of the hollow fiber membrane bundle 3 instead of changing the number of the through holes.

  As shown in FIG. 7, when the first rectification cylinder 6 is erected with the first nozzle 51 a side formed opposite to the first rectification cylinder 6 standing down, One end 61 that is not bonded to the bonding portion 20 is formed to have a length that corresponds to the upper end position 51b of the opening of the first nozzle 51a. As shown in FIG. 8, the second rectifying cylinder 7 is also erected, with the second nozzle 52a side formed opposite to the second rectifying cylinder 7 facing down, like the first rectifying cylinder 6. In this case, that is, in the case of standing upside down from the state shown in FIG. 1, one end 71 of the second rectifying cylinder 7 that is not bonded to the bonding portion 20 is positioned at the upper end position 52b of the opening of the second nozzle 52a. It is formed in the length which becomes.

  The length of the first rectifying cylinder 6 is not limited to the above-described length, but the one end 61 of the first rectifying cylinder 6 is connected to the upper end position 51b of the opening of the first nozzle 51a and the opening from the upper end position 51b. It is desirable that the length be a position between the position P1 extending in the longitudinal direction of the casing 5 by the length of the inner diameter D1. Similarly, with respect to the length of the second rectifying cylinder 7, the one end 71 of the second rectifying cylinder 7 is set such that the upper end position 52 b of the opening of the second nozzle 52 a and the length of the inner diameter D 2 of the opening from the upper end position 52 b are the same. It is desirable that the length be a position between the position P2 and the position P2 extending in the longitudinal direction.

  Here, preferred lengths of the first rectifying cylinder 6 and the second rectifying cylinder 7 will be described with reference to simulation data shown in FIGS. The simulation data shown in FIGS. 10 to 12 is a result of simulating the velocity of water flowing in the hollow fiber membrane module 1, and shows the case where the lengths of the first rectifying cylinder 6 and the second rectifying cylinder 7 are changed. 5 shows a change in the speed of the flow. In the following description of the simulation, the first rectifying cylinder 6 and the second rectifying cylinder 7 are simply referred to as rectifying cylinders.

First, the simulation conditions used to calculate the simulation data shown in FIGS. 10 to 12 will be described. As the simulation software, thermal fluid analysis software "PHOENICS" manufactured by CHAM (Concentration Heat and Momentum Limited.) Was used, and the calculation formula was KE-CHEN. The simulation was performed using 20 ° C. water as the fluid. Further, as a simulation model of the hollow fiber membrane module 1, a 3D model in which nozzles out_1 and out2 were provided on both side surfaces of a cylinder as shown in FIG. 9 and divided in half in the vertical direction (length direction) was used. . The distance L1 between the nozzles out_1 and out2 of the simulation model shown in FIG. 9 is 0.806 m, 1/2 of the maximum inner diameter of the cylinder is 0.123 m, and the length from the upper ends of the nozzles out_1 and out_2 to the lower end of the cylinder. L2 was set to 0.273 m. The number of mesh cells (the number of model divisions) of the simulation model was 2,492,100. The simulation of the velocity of water near the nozzle was performed when the SWEEP number of the fluid was 1000 times and the inflow of water from the end of the cylinder was 2.08 × 10 ⁻⁴ m ³ / s. The resistance value of the hollow fiber membrane bundle in the cylinder in the x, y, and z directions was 0.4, and the porosity was 0.7.

  10 to 12 show the results of a simulation performed under the above-described simulation conditions. The velocity distribution of water is represented by shading, the direction in which water flows is represented by arrows, and the magnitude of the velocity of water is represented by arrows. Expressed in length. That is, the longer the arrow, the higher the water velocity. FIGS. 10 to 12 show simulation results of the flow of water near the nozzle out_1. M1 to M4 shown in FIGS. 10 to 12 are modeled by changing the length of the flow straightening cylinder. is there. FIG. 10 is a simulation result when the distance between the model of the rectifying cylinder and the inner surface of the model of the casing 5 is 5 mm. FIG. 11 shows the distance between the model of the rectifying cylinder and the inner surface of the model of the casing 5. FIG. 12 shows a simulation result when the distance between the model of the rectifying cylinder and the inner surface of the model of the casing 5 is 3 mm.

  FIG. 10I shows a simulation result in a case where one end of the rectifying cylinder is located at the position of the inner surface of the nozzle. That is, as in the above-described embodiment, when the first nozzle 51a is erected with the first nozzle 51a facing down, the one end 61 of the first rectifying cylinder 6 is at the upper end position 51b of the opening of the first nozzle 51a, or the second nozzle This is a simulation result assuming that one end 71 of the second rectifying cylinder 7 is located at the upper end position 52b of the opening of the second nozzle 52a when the second nozzle 52a is standing upright. FIG. 10II is a simulation result when the length of the flow straightening cylinder is extended by the inner diameter of the nozzle as compared with the case of FIG. 10I. FIG. 10III is a simulation result when the length of the flow straightening cylinder is set to の of the inner diameter of the nozzle. FIG. 10IV shows a simulation result in the case where the length of the flow regulating cylinder is set to three times the inner diameter of the nozzle.

  Comparing the simulation result of FIG. 10I with the simulation result of FIG. 10III, it can be seen that the simulation result of FIG. 10I has a shorter overall arrow length, and the flow of water can be sufficiently suppressed by the rectifying cylinder. . That is, it can be seen that the hollow fiber membrane oscillates due to the flow of water, and the hollow fiber membrane is thereby sufficiently prevented from being damaged.

  In addition, comparing the simulation results of FIG. 10I and the simulation results of FIG. 10IV, the arrows in the simulation results of FIG. 10IV are generally shorter than those in FIG. 10I, and the flow of water can be sufficiently suppressed. However, on the other hand, the arrow is too short and the flow of water is slow overall, that is, this means that the filtration process itself has not progressed, which causes a decrease in filtration efficiency. Therefore, it can be said that the simulation result of FIG. 10I is more preferable than the simulation result of FIG. 10IV.

  Next, comparing the simulation result of FIG. 10II with the simulation result of FIG. 10IV, the simulation result of FIG. 10II shows that although the flow of water is slow near the end of the casing (the left end of FIG. 10II), In the place, the water flow is close to the simulation result shown in FIG. 10I. Therefore, in the case of FIG. 10II, it can be said that the occurrence of damage to the hollow fiber membrane can be sufficiently suppressed without causing a significant decrease in the filtration efficiency.

  11I to IV and 12I to IV differ from FIGS. 10I to 10IV in the distance between the rectifying cylinder and the inner surface of the casing as described above. 10I, 11I, and 12I are the same, FIGS. 10II, 11II, and 12II are the same, and FIGS. 10III, 11III, and 12III are the same. 10IV, 11IV and 12IV are the same. From the simulation results of FIGS. 11I to IV and FIGS. 12I to IV, it can be seen that the cases of FIGS. 11I and 11II and the cases of FIGS. 12I and 12II are more preferable simulation results.

  When the first rectifying cylinder 6 is erected with the first nozzle 51a down, the first rectifying cylinder 6 has a length such that one end 61 of the first rectifying cylinder 6 is above the upper end position 51b of the opening of the first nozzle 51a. Is formed, or when the second nozzle 52a is erected with the second nozzle 52a facing down, the one end 71 of the second rectifying cylinder 7 has a length above the upper end position 52b of the opening of the second nozzle 52a. In the case of forming the two-rectification cylinder 7, as shown in FIG. 13, the first rectification cylinder 6 or the first rectification cylinder 7 is attached to a part of the outer peripheral side that is not bonded to the bonding portion 20 of the second rectification cylinder 7. A restricting portion 8 for restricting the swing of the cylinder 6 or the second rectifying cylinder 7 may be formed. 13I is an external perspective view of the first rectifying cylinder 6 or the second rectifying cylinder 7, and FIG. 13II is a top view of the first rectifying cylinder 6 or the second rectifying cylinder 7.

  The restricting portion 8 is a protrusion formed in a convex shape. Even when the flow of the liquid in the casing 5 is fast, the swing of the first rectifying cylinder 6 or the second rectifying cylinder 7 can be regulated by the restricting portion 8 abutting on the inner surface of the casing 5. Thereby, damage of the hollow fiber membrane 2 due to the first rectifying cylinder 6 or the second rectifying cylinder 7 swinging and coming into contact with the hollow fiber membrane bundle 3 can be prevented. In addition, although it is desirable that the restricting portion 8 is adhered to the inner surface inside the casing 5, it is not necessary to adhere.

  Further, as shown in FIGS. 13I and 13II, the position of the restricting portion 8 is the same as the axial direction connecting the group of the opposed through holes 30 and the direction orthogonal to the axial direction (first direction). It is desirable to provide the rectifying cylinder 6 or the second rectifying cylinder 7 with the central axis as a rotation axis (in a direction in which the axial direction is rotated by 90 °).

  Next, returning to FIGS. 5 and 7, a joint portion between the extension portion 6 a of the first rectifying cylinder 6 and the casing 5 will be described. As shown in FIGS. 5 and 7, the extended portion 6 a of the first rectifying cylinder 6 and the inner surface of the casing 5 are joined in a range from the lower end position 51 c of the opening of the first nozzle 51 a to one end of the casing 5. Have been. Note that, as in the present embodiment, it is desirable that the extending portion 6a or the adhesive portion 20 be provided to the lower end position 51c of the opening of the first nozzle 51a. Accordingly, it is possible to prevent a liquid stagnation portion from being formed near the opening of the first nozzle 51a.

  As shown in FIG. 8, the joint between the extension portion 7 a of the second straightening cylinder 7 and the casing 5 ranges from the lower end position 52 c of the opening of the second nozzle 52 a to one end of the casing 5. The extension 6a and the inner surface of the casing 5 are joined. In addition, it is desirable that the extended portion 7a or the adhesive portion 20 be provided to the lower end position 52c of the opening of the second nozzle 52a also in this joint portion. Thus, it is possible to prevent a liquid stagnation portion from being formed near the opening of the second nozzle 52a.

  Next, a manufacturing process of the above-described hollow fiber membrane module 1 will be described.

  First, a predetermined number of hollow fiber membranes 2 are arranged as a bundle to produce a hollow fiber membrane bundle 3. Subsequently, the hollow opening of each hollow fiber membrane 2 of the hollow fiber membrane bundle 3 is sealed with a sealing material.

  Next, the first straightening tube 6 is inserted into the first tubular member 51, the inner side surface of the end of the first tubular member 51 is joined to the first straightening tube 6, and the inside of the second tubular member 52 is The second rectifying cylinder 7 is inserted into the second rectifying cylinder 7, and the inner side surface of the end of the second cylindrical member 52 is joined to the second rectifying cylinder 7. The joining portion 51b of the first tubular member 51 is located on the inner peripheral side of the cylinder, and the joining portion 52b of the second tubular member 52 is located on the outer peripheral side of the cylinder. Is done.

  Next, the hollow fiber membrane bundle 3 in which the hollow portion of each hollow fiber membrane 2 is sealed is inserted into the casing 5 to which the first rectifying cylinder 6 and the second rectifying cylinder 7 are joined, and each of the bundles is sealed using a potting material. The ends of the hollow fiber membranes 2 were bonded together, and the hollow fiber membrane bundle 3 and the first rectifying cylinder 6 and the second rectifying cylinder 7 were bonded and fixed.

  The hollow fiber membrane bundle 3 and the casing 5 are bonded and fixed by centrifugal bonding in which the casing 5 in which the hollow fiber membrane bundle 3 is housed is rotated while being rotated in the horizontal direction, or the longitudinal direction of the casing 5 is arranged vertically. Then, the potting material can be applied by static bonding injecting from the lower end of the casing 5. Centrifugal bonding allows both ends of the hollow fiber membrane bundle 3 to be bonded simultaneously, but requires a large capital investment and electric power for rotating at high speed. On the other hand, stationary bonding requires bonding one side at a time, so that the time required for bonding increases, but it does not require large-scale capital investment and can be implemented with a simple jig. After the potting material is cured, if necessary, a complete curing at a high temperature may be performed.

  Next, after confirming that the potting material in the casing 5 has hardened, the portion sealed by the sealing material is cut, and the end of the hollow fiber membrane bundle 3 is opened.

  Finally, as shown in FIG. 14, pipe connection caps 10 and 11 are attached via O-rings 12 to both ends of the casing 5 to which the hollow fiber membrane bundle 3 is bonded and fixed, respectively. After fastening and fixing, the hollow fiber membrane module 1 is completed after confirming that it has been manufactured as specified by leak inspection, trial operation, and the like.

  Next, an example of a mode in which the hollow fiber membrane module 1 of the present embodiment is installed in a filtration device 100 will be described with reference to FIG. 15, and a filtration method using the hollow fiber membrane module 1 of the present embodiment will be described. I do. In addition, in this filtration device 100, a cross-flow filtration method using internal pressure filtration is assumed.

  The filtration device 100 includes a supply pipe 101 connected to the pipe 11a of the cap 11 of the hollow fiber membrane module 1 and supplying the water to be treated, a circulation pipe 102 connected to the pipe 10a of the cap 10 and sending out circulating water. It has. Further, pressure gauges Pi and Po, valves 101a and 102a, and the like are provided in the middle of the supply pipe 101 and the circulation pipe 102. Further, the filtration device 100 includes an upper filtered water discharge pipe 103 and a lower filtered water discharge pipe 104 serving as flow paths of the filtered water. The upper filtered water discharge pipe 103 and the lower filtered water discharge pipe 104 are connected to a combined pipe 105 of the filtered water, and the combined pipe 105 is connected to an external pipe (not shown). The merging pipe 105 is provided with a pressure gauge Pf, a valve 105a, and the like.

  The hollow fiber membrane module 1 is arranged vertically, the second nozzle 52a is connected to the upper filtered water discharge pipe 103, and the first nozzle 51a is connected to the lower filtered water discharge pipe 104.

  The water to be treated is introduced into the hollow fiber membrane module 1 from the supply pipe 101 through the pipe line 11a at a predetermined pressure. The water to be treated is introduced into the hollow portion of each hollow fiber membrane 2 and is filtered by the hollow fiber membrane 2, and the filtered water seeps out from the outer surface of each hollow fiber membrane 2. The filtered water is discharged to the merging pipe 105 through the upper filtered water discharge pipe 103 or the lower filtered water discharge pipe 104, and collected through an external pipe. On the other hand, the water to be treated that has passed through the hollow fiber membrane 2 is discharged from the conduit 10 a of the cap 10 as circulating water, and sent out to the circulating pipe 102.

  In the above description, the water to be treated is supplied from the pipe 11a, and the circulating water (concentrated water) is discharged from the pipe 10a. Water (concentrated water) may be discharged from the pipe 11a.

DESCRIPTION OF SYMBOLS 1 Hollow fiber membrane module 2 Hollow fiber membrane 3 Hollow fiber membrane bundle 5 Casing 6 First rectification cylinder 6a Extension 6b Annular uneven structure 7 Second rectifier cylinder 7a Extension 7b Annular uneven structure 8 Regulators 10, 11 Cap 10a , 11a Pipe line 10b Annular groove 12 Ring 13 Nut 20 Adhesive part 20a Annular groove 30 Through hole 51 First cylindrical member 51a First nozzle 52 Second cylindrical member 52a Second nozzle 100 Filtration device

Claims (9)

A hollow fiber membrane bundle in which a plurality of hollow fiber membranes are bundled,
A tubular casing in which the hollow fiber membrane bundle is housed and which has at least one nozzle through which liquid can enter and exit;
At the end of the hollow fiber membrane bundle on the side where the nozzle is formed, an adhesive portion formed by adhesively fixing each of the hollow fiber membranes,
A rectifying cylinder provided between the opening of the nozzle on the inner side surface of the casing and the hollow fiber membrane bundle and formed in a cylindrical shape so as to surround the outer periphery of the hollow fiber membrane bundle;
The rectifying cylinder is extended from the lower end position of the opening of the nozzle toward one end of the hollow fiber membrane bundle closer to the nozzle when the nozzle is erected with the side on which the nozzle is formed down,
An extending portion that regulates movement of the hollow fiber membrane bundle in a direction outward from a central axis of the casing, wherein the extending portion has an outer peripheral surface facing an inner surface of the casing of the bonding portion and the outer peripheral surface; Directly joined to the inner surface of the casing,
The hollow fiber membrane module is characterized in that the bonding portion is provided over the entire range from the lower end position of the opening of the nozzle to one end of the casing . When the nozzle is formed with the side on which the nozzle is formed upright, one end of the rectifying cylinder that is not adhered to the adhesive portion is positioned at the upper end position of the opening of the nozzle and the inner diameter of the opening from the upper end position. 2. The hollow fiber membrane module according to claim 1, wherein the position is a position between the position extending above the casing in the longitudinal direction by the length of the casing. 3. 3. The hollow fiber membrane module according to claim 2, wherein one end of the rectifying cylinder that is not bonded to the bonding portion is an upper end position of the opening of the nozzle. 4. One end of the rectifying cylinder, which is not bonded to the bonding portion, is located above the upper end position of the opening of the nozzle, and a part of the outer peripheral side of the rectifying cylinder, which is not bonded to the bonding portion. 3. The hollow fiber membrane module according to claim 2, further comprising a restricting portion for restricting swinging of the rectifying cylinder.   The hollow fiber membrane module according to any one of claims 1 to 4, wherein an annular concavo-convex structure is formed on an inner surface of the rectifying cylinder that is joined to the adhesive portion. The hollow fiber membrane module according to claim 5, wherein finer irregularities are formed on the surface of the annular uneven structure than the annular uneven structure. The hollow fiber membrane module according to any one of claims 1 to 6, wherein a plurality of through holes are formed in the flow regulating cylinder. The hollow fiber membrane module according to claim 7 , wherein the through-hole is formed in a portion other than a surface facing the opening of the nozzle. Claim 7 wherein the through hole, when the side where the nozzle is formed standing in the bottom, characterized in that it is formed such that the number gradually decreases toward the lower end of the hollow fiber membrane bundle Or the hollow fiber membrane module according to 8 .