JP2018083142A - Membrane module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a membrane module in which a primary side space and a secondary side space do not communicate with each other through a seal member even if a pressure acts thereon during back washing.SOLUTION: A membrane module is formed including a membrane element 2 and a casing 100 which houses the membrane element. The membrane module includes: an annular seal member 44 which is disposed at a peripheral edge of an end surface 6a of the membrane element; and a pressing part P which presses the membrane element 2 through the seal member and partitions a primary side space R1 from a secondary side space R2 in the casing 100. A seal member holding mechanism K which prevents movement or displacement of the seal member 44 from allowing communication between the primary side space and the secondary side space is included in the seal member or the pressing part.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a membrane module including a membrane element and a casing in which the membrane element is accommodated.

  Patent Document 1 discloses a membrane module including a membrane element for filtering raw water and a cylindrical casing that accommodates the membrane element.

  As shown in FIG. 15, the membrane module 20 presses the membrane element 2 via the annular seal member 44 disposed on the periphery of the end surface 6 a of the membrane element 2 and the seal member 44, and the primary in the casing 100. A lid 50 including a pressing portion P (51) that partitions the side space R1 and the secondary side space R2 is provided.

Japanese Patent Application Laid-Open No. 2015-178089

  When the membrane element 2 accommodated in such a membrane module 20 is a ceramic membrane element, the size varies to some extent due to temperature conditions during firing, specifically in the axial direction of the casing body 40. Therefore, the length of the membrane element varies along the line, so that it is necessary to individually adjust the pressing force on the seal member 44.

  For this reason, the membrane module described in Patent Document 1 is fitted into the opening end of the casing body 40 and is movable while maintaining the posture in the axial direction of the casing body while ensuring watertightness with the casing body. The lid 50 configured as described above is provided, and the pressing force can be individually adjusted by adjusting the position of the lid 50.

  However, even if the pressing force against the seal member 44 is simply adjustable, when the back washing process for supplying high-pressure washing water from the secondary side space R2 to the primary side space R1 is executed, the pressure is sealed by the pressure. The urging force acts on the edge of the member 44 to move the seal member 44, and the primary side space R1 and the secondary side space may communicate with each other by detaching from the pressing state by the pressing portion P (51). There was a problem.

  When primary side space and secondary side space communicate, the problem that raw | natural water mixes in filtered water through the said communication part by the filtration process after the completion | finish of a backwash process generate | occur | produces.

  An object of the present invention is to provide a membrane module in which a primary side space and a secondary side space do not communicate with each other through a seal member even when pressure is applied during backwashing.

  In order to achieve the above object, a first characteristic configuration of a membrane module according to the present invention comprises a membrane element and a casing in which the membrane element is accommodated as described in claim 1 of the claims. A membrane module comprising: an annular seal member disposed at a peripheral edge of the end face of the membrane element; and the membrane element is pressed via the seal member, and a primary side space and a secondary side space in the casing And a seal member holding mechanism for preventing communication between the primary side space and the secondary side space due to movement or displacement of the seal member is provided in the seal member or the press part. In the point.

  The seal member is pressed toward the membrane element by the pressing part, and the seal member is moved by the seal member holding mechanism provided in the seal member or the pressing part in a state where the seal member is partitioned into the primary side space and the secondary side space in the casing. Alternatively, the displacement is suppressed, and the communication between the primary side space and the secondary side space is preferably prevented.

  In the second characteristic configuration, as described in the second aspect, in addition to the first characteristic configuration described above, the casing is disposed at the end of the cylindrical member and the axial direction of the cylindrical member. A first opening that communicates with the lid member and communicates with the primary space. The first opening includes a lid member that includes a cylindrical member that protrudes from the inner peripheral surface of the lid member in the axial direction. And a second opening that communicates with the secondary-side space.

  The seal member is pressed by a pressing portion configured by a cylindrical portion that is formed so as to protrude from the inner peripheral surface of the lid member in the axial direction of the cylindrical member, and in this state, the inside of the casing includes the primary side space and the secondary side space. The first opening provided in the lid member communicates with the primary side space, and the second opening provided in the lid member communicates with the secondary side space.

  In the third feature configuration, as described in the third aspect, in addition to the first or second feature configuration described above, the seal member holding mechanism is covered by the seal member pressed by the pressing portion. It exists in the point comprised by the rise part provided in the press surface and formed so that it might stand up to the said secondary side space side from the said press part.

  Even when a large pressure is applied to the secondary side space by the washing portion while the seal member is pressed by the pressing portion, the seal member is covered more than the distance formed between the tip of the pressing portion and the end face of the membrane element. Since the thickness of the rising portion provided on the pressing surface is increased, it is effectively prevented that the seal member passes through the pressing portion and moves to the primary side space or is displaced.

  The fourth feature configuration is that, as described in claim 4, in addition to the third feature configuration described above, the rising portion is formed in a downward slope toward the primary space. .

  When the rising portion provided on the pressed surface of the seal member is formed with a downward slope toward the primary side space, in other words, with the upward slope toward the secondary side space, Even if a large pressure is applied, it is effectively prevented that the seal member passes through the pressing portion and moves to the primary side space or is displaced.

  In the fifth feature configuration, as described in claim 5, in addition to the first or second feature configuration described above, the seal member holding mechanism is in contact with an inner peripheral surface of the seal member. It is the point which is the extension part extended and formed from the said press part to the primary side space side.

  Even when a large pressure is applied to the secondary side space by the washing portion while the seal member is pressed by the pressing portion, the extension portion formed to extend from the pressing portion to the primary side space side is the inner periphery of the seal member. The contact with the surface effectively prevents the seal member from passing through the pressing portion and moving to the primary side space or being displaced.

  In the sixth feature configuration, as described in claim 6, in addition to any one of the first to fifth feature configurations described above, the end face shape of the membrane element and the contour shape of the seal member are substantially large. It is a point that is a square.

  When large pressure is applied to the secondary space by washing water, the pressure that affects the corners and sides of the seal member is different. Even if such uneven pressure is applied, the seal member holding mechanism This effectively prevents the seal member from passing through the pressing portion and moving to the primary side space or being displaced.

  As described above, according to the present invention, it is possible to provide a membrane module in which the primary side space and the secondary side space do not communicate with each other through the seal member even when pressure is applied during backwashing. Became.

The perspective view of the membrane filtration unit comprised with the membrane module by this invention It is explanatory drawing of the membrane filtration unit comprised with the membrane module by this invention, (a) is a top view, (b) is a front view, (c) is a bottom view, (d) is a left view. It is explanatory drawing of the porous body which is a component of a membrane element, (a) is a perspective view showing a front, a plane, and a right side, (b) is a perspective view showing a back, a bottom, and a left side. Explanatory drawing of filtration process using membrane element Explanatory drawing of the membrane casing constituting the membrane module It is explanatory drawing of the base of a membrane casing, (a) is a top view, (b) is a front view, (c) is a rear view, (d) is a right view. It is explanatory drawing of the casing main body of a membrane casing, (a) is a side view, (b) is a front view, (c) is a top view, (d) is a bottom view. It is explanatory drawing of the sealing member of a membrane casing, (a) is a top view, (b) is the sectional view on the AA line of (a), (c) is the sectional view on the BB line of (a). It is explanatory drawing of the packing cover of a membrane casing, (a) is a top view, (b) is a side view It is explanatory drawing of the upper cover body of a film | membrane casing, (a) is a top view, (b) is a front view, (c) is a left view, (d) is a bottom view. It is explanatory drawing of the holding | maintenance part of a membrane casing, (a) is a top view, (b) is a front view, (c) is a bottom view. It is explanatory drawing of the support part of a membrane casing, (a) is a top view, (b) is a front view, (c) is a side view, (d) is the sectional view on the AA line of (a). (A)-(c) is explanatory drawing of a sealing member holding mechanism. (A)-(e) is explanatory drawing of the sealing member holding mechanism which shows another embodiment. Explanatory drawing of the membrane casing which comprises the conventional membrane module

Below, the membrane module and membrane filtration apparatus by this invention are demonstrated.
FIG. 1 and FIGS. 2A to 2D illustrate a membrane filtration unit 1 including a membrane module 20 according to the present invention. The membrane filtration apparatus 1 includes four membrane modules 20, a raw water header pipe 22 that supplies raw water to each membrane module 20, a cleaning header pipe 24 that supplies cleaning air, water, or a chemical to each membrane module 20, A filtered water header pipe 26 for collecting the filtered water of each membrane module 20 is provided.

  Each membrane module 20 includes a membrane casing 100 and a membrane element 2 accommodated in the membrane casing 100, and the membrane casing 100 is supported by the base 30, the casing body 40, the upper lid body 50, and the casing body 40. And a holding portion 70 that holds the relative position of the support portion 60 and the upper lid body 50 along the axial direction of the casing body 40 so as to be adjustable.

  In the filtration step, the raw water supplied from the raw water header pipe 22 is filtered by passing from the primary side to the secondary side of the membrane element 2, and the filtered water is filtered from the filtered water outflow pipe 54 formed in the upper lid 50. Water is collected in the water header pipe 26. In the washing process (back washing process), the washing water is supplied from the filtered water header pipe 26, the washing water passes from the secondary side of the membrane element 2 to the primary side, and the washing waste water is drained from the raw water header pipe 22. After that, cleaning air or the like is supplied from the cleaning header pipe 24 and flushed. The material of the base 30, the casing main body 40, the upper lid 50, the support part 60, the holding part 70, etc. may be any metal or resin that can withstand the pressure in the filtration process and the cleaning process.

  FIG. 4 illustrates a membrane element 2 used in the membrane filtration device 1 according to the present invention. The membrane element 2 is composed of a plurality of ceramic molded bodies 6 bonded through a bonding material layer 11.

  As shown in FIGS. 3A and 3B, the ceramic molded body 6 has a substantially rectangular parallelepiped shape, and a plurality of fluid flow holes 3 are formed so as to penetrate between a pair of opposed end surfaces 6a and 6b. . The ceramic molded body 6 is formed with a plurality of slits 5 having one end closed at the base end side end surface 6a and the other end opened at the opposite side end surface 6b and open at the side surfaces 6c and 6d.

  Two slits 5 formed so as to extend from the center to the side surface 6d when viewed from the opposite end surface 6b, and six slits formed so as to extend to the side surface 6c so as to be orthogonal to the two slits 5. 5, the fluid flow holes 3 are divided into 8 blocks, and one fluid flow hole 3 is formed at the center and 10 are formed in each block.

  In this embodiment, 81 fluid flow holes 3 are formed in the ceramic molded body 6, and a filtration membrane is formed on the inner wall surface of each fluid flow hole 3.

  Such a ceramic molded body 6 is obtained by press-forming a ceramic granular body.

  The bonding material 11 is disposed between the opposing surfaces 6a and 6b of the plurality of ceramic molded bodies 6 and positioned so that the fluid flow holes 3 overlap and communicate with each other for a predetermined time. By baking at a temperature, a substrate made of a porous body in which a plurality of ceramic molded bodies 6 are integrally bonded is formed.

  In this way, seven stages of the ceramic molded bodies 6 are laminated to form a porous membrane element substrate.

  Finally, the slurry to which the ceramic particles are added is applied to the inner peripheral surface of the fluid flow hole 3 of the ceramic molded body 6, and then subjected to firing treatment, whereby the filtration membrane layer 4 is formed on the inner peripheral surface of the fluid flow hole 3. (See FIG. 4) is formed.

  As shown in FIG. 4, the upper and lower end surfaces of the membrane element 2 made of the porous body configured as described above are closed by glass or resin coating or the like, and water to be treated is introduced from, for example, the lower end side of the fluid flow hole 3. When the raw water is injected, a filtration process is performed in which specific components are removed by the filtration membrane layer 4 formed on the inner wall of the fluid flow hole 3, and the filtered water flows out from the surfaces 6 c and 6 d of the base material and the slit 5. By collecting the filtered water, treated water can be obtained from the treated water.

  The membrane element 2 described above is merely an example, and the specific configuration is not limited to the configuration of the embodiment. For example, in the present embodiment, a plurality of ceramic molded bodies are formed by laminating, but they are formed by various other methods such as forming by extrusion molding and bundling a plurality of tubular membranes in a parallel arrangement using a tube sheet. can do.

  Hereinafter, the specific structure of the membrane casing 100 of the membrane module 20 which comprises the membrane filtration apparatus 1 is explained in full detail based on drawing.

  As shown in FIGS. 6A to 6D, the base 30 of the membrane module 20 is provided with four concave portions 36 corresponding to the four membrane modules 20 constituting the membrane filtration device 1. . A substantially square convex wall portion 33 is formed in the center of the frame body 34 supported by the leg portions 32 in accordance with the casing body 40 having a substantially square cross section, and a concave portion 36 is formed inside the convex wall portion 33. Is formed.

  A raw water supply pipe 38 that is connected to the raw water header pipe 22 and introduces raw water is integrally formed at the center of the recess 36. Further, the frame body 34 is formed with bolt insertion holes 31 for fastening and fixing the casing body 40 at positions corresponding to the corners of the convex wall portions 33. An annular recess 39 into which an O-ring 39a is fitted is formed at the lower end edge of the raw water supply pipe 38, and is connected to the raw water header pipe 22 horizontally provided at the lower part thereof in a watertight manner. An annular recess 35 into which the O-ring 35a is fitted is formed at the lower end edge of the outer periphery of the convex wall 33, and is connected to the inner wall of the casing body 40 in a watertight manner.

  As shown in FIGS. 7A to 7D, the casing body 40 is formed of a cylindrical body having a substantially rectangular cross section, and a plurality of ribs 42 are formed on the outer peripheral surface to ensure strength. In addition, a flange 43 having a diameter larger than that of the central portion is formed on both ends.

  Bolt insertion holes 41 are formed at the corners of the flange 43. The area of the substantially rectangular cross section is configured to be larger than the area of the cross section of the membrane element 2 so that the above-described membrane element 2 can be accommodated in the axial direction in the casing body 40, and filtered water by the membrane element 2 is The membrane element 2 is configured to leak and be stored in a secondary space formed between the peripheral surfaces 6c and 6d sandwiched between the opposing surfaces 6a and 6a of the membrane element 2 and the inner peripheral surface of the casing body 40. .

  The casing body 40 is erected on the convex wall portion 33 formed on the base 30, and bolts are inserted and fixed across the bolt insertion holes 31 of the base 30 and the bolt insertion holes 41 of the casing body 40.

  Further, as shown in FIG. 6B, a rubber packing 44 as a seal member is accommodated in the recess 36 formed in the base 30, and the above-described membrane element 2 is accommodated thereon. The outer surface of the rubber packing 44 is supported by a flat surface formed at the peripheral edge of the recess 36, and the peripheral edge of the lower end surface 6a (see FIG. 4) of the membrane element 2 is in pressure contact with the inner surface of the rubber packing 44. The supply pipe 38 and the lower end surface 6a of the membrane element 2 are sealed in a watertight manner.

  As shown in FIGS. 8A, 8B, and 8C, the rubber packing 44 has an opening 45 through which raw water can flow at the center, and the inner wall 46 has a corner of the lower end surface 6a of the membrane element 2. A stepped portion 47 that contacts the lower surface of the portion is formed. The inner wall 46 and the peripheral surfaces 6c and 6d (see FIG. 4) of the membrane element 2 are in close contact with each other, and the outer wall 48 and the inner wall of the convex wall 33 are in close contact with each other. As a result, the raw water supplied from the raw water supply pipe 38 is prevented from leaking into the space between the peripheral surfaces 6c and 6d of the membrane element 2 and the casing body 40 from the lower end surface 6a of the membrane element 2. It flows into the fluid flow hole 3.

  As shown in FIG. 5, a rubber packing 44 is also installed on the upper end surface 6 a (see FIG. 4) of the membrane element 2 accommodated in the casing body 40, and the rubber packing 44 is pressurized from the periphery to surround the membrane element 2. The outer periphery of the rubber packing 44 is covered with a packing cover 90 that is in close contact with the surface. The rubber packing 44 functions as an annular seal member disposed on the periphery of the end face of the membrane element 2.

  FIGS. 9A and 9B show a packing cover 90 for securing a passage for guiding the filtered water that has passed through the membrane element 2 to the filtered water outflow pipe 54. The packing cover 90 is a substantially square annular member, and has an opening 91 formed at the center thereof, an inner periphery thereof formed so as to be in contact with the outer periphery of the rubber packing 44, and upward from the vicinity of the center of the outer periphery. A plurality of columnar projections 92 are formed in the circumferential direction of the end surface.

  The upper lid 50 is inserted from above the packing cover 90 so as to be fitted into the flange 43 from the opening end of the casing body 40. When the upper lid 50 is pressed downward, the rubber packing 44 is pressed from above at the inner lower edge 51 of the upper lid 50, and the cylindrical protrusion 92 is raised at the outer lower edge 52 of the upper lid 50. It is comprised so that it may be pressed from.

  As shown in FIGS. 10A to 10D, the upper lid body 50 has a substantially square shape whose outer periphery is slightly smaller than the inner periphery of the flange 43 at the top of the casing body 40 in a plan view. A ceiling wall 53 having a shape is provided.

  At the center of the ceiling wall 53, a fluid flow port 55 to which cleaning air and water are supplied from the cleaning header pipe 24 (see FIG. 1) is formed, and one side of a substantially rectangular outer periphery (FIG. 10 (a)). In the vicinity of the left side), a filtrate outflow pipe 54 for leading filtrate to the outside is formed so as to protrude upward.

  Concave portions 52a, 54a, and 55a for accommodating O-rings are formed in the peripheral portions of the outer lower edge portion 52, the filtrate outflow pipe 54, and the fluid flow port 55, and can be sealed so that the fluid passing therethrough does not leak. It is configured.

  Accordingly, the upper lid body 50 maintains its posture in the axial direction of the casing body 40 while ensuring water-tightness with respect to the inner circumferential surface of the casing body 40 by an O-ring attached to the recess 52a formed on the outer peripheral end face. You can move it.

  As shown in FIGS. 11A, 11B, and 11C, the holding unit 70 is formed of a substantially cylindrical tubular member in which a fluid flow pipe 73 for supplying cleaning air or the like is formed. A recess 71 for accommodating the O-ring is formed on the peripheral surface, and a communication state is established between the fluid flow tube 73 and the fluid flow port 55 (see FIG. 10A) of the upper lid 50 at the lower end. A collar portion 72 that is in press contact is formed so as to keep.

  On the outer periphery of the holding part 70, a male screw part 74 is formed from the central part in the vertical direction downward, and a rotary operation part 75 having a hexagonal cross section is formed above the male screw part 74.

  As shown in FIGS. 12 (a) to 12 (d), four support portions 60 are connected in series corresponding to the four membrane modules 20 constituting the membrane filtration device 1. Each support portion 60 includes an annular portion 63 at the center, and four beam portions 64 extend from the annular portion 63 in a cross shape in plan view. The beam portion 64 is formed in an arch shape that curves outward along the upper surface of the dome-shaped ceiling wall 53. On the inner wall of the annular portion 63, a female screw portion 66 that is screwed with the male screw portion 74 of the holding portion 70 is formed.

  The end portion of the beam portion 64 includes a cylindrical portion 65 in which a bolt insertion hole 61 for fixing the support portion 60 to a bolt insertion hole 41 formed in the casing body 40 is formed. Bolts are inserted through the bolt insertion holes 41 of the casing body 40 and the bolt insertion holes 61 of the support section 60, and the support section 60 is fixed to the casing body 40.

  As shown in FIG. 5, a holding portion 70 in which a fluid flow pipe 73 is formed is disposed above an fluid flow port 55 formed in the upper lid 50 via an O-ring. The male screw portion 74 formed on the outer peripheral portion of the holding portion 70 and the female screw portion 66 formed on the annular portion 63 of the support portion 60 are screwed together so that the holding portion 70 is in the center of the upper lid 50 in plan view. Positioned and held by the part.

  The degree of screwing between the male screw portion 74 and the female screw portion 66 is adjusted by rotating the rotary operation portion 75 of the holding portion 70 manually or using a tool. As a result, the holding portion 70 is set with reference to the support portion 60. Thus, the degree of pressing downward of the upper lid 50 is adjusted.

  The rubber packing 44 is pressed from above by the inner lower edge portion 51 of the upper lid body 50, and the cylindrical protrusion 92 is pressed from above by the outer lower edge portion 52 of the upper lid body 50, and further into the recess 36 of the base 30. The membrane element 2 is firmly fixed between the rubber packing 44 arranged.

  An inner lower edge portion 51, which is a cylindrical portion protruding from the inner peripheral surface of the upper lid 50 in the axial direction of the casing body 40, presses the membrane element 2 via the rubber packing 44, It becomes the press part P which divides primary side space R1 which is the space where raw | natural water flows, and secondary side space R2 which is the space where filtered water flows. The lid member 50 is provided with a fluid flow port 55 serving as a first opening communicating with the primary side space R1 and a filtered water outflow pipe 54 serving as a second opening communicating with the secondary side space R2. .

  Movement or displacement of the rubber packing 44 to the primary side space R1 against the pressing force by the pressing portion P under the influence of the high-pressure cleaning water supplied from the filtered water header pipe 26 in the cleaning process (back cleaning process) The rubber packing 44 is provided with a seal member holding mechanism K that prevents communication between the primary space R1 and the secondary space R2.

  More specifically, as shown in FIG. 13A, the seal member holding mechanism K is provided on the pressed surface 44 </ b> A of the rubber packing 44 pressed by the pressing portion P, and the secondary space R <b> 2 side from the pressing portion P. It is composed of a rising portion formed so as to rise. The rising portion is formed with a downward slope toward the primary space R1.

  As shown in FIG. 13 (b), it is preferable that two beads B that are annularly continuous along the circumferential direction are formed on the pressing surface, which is the lower surface of the pressing portion P, and the rubber packing 44 is formed by the beads B. Is firmly pressed toward the upper surface 6a of the membrane element 2, and the movement or displacement of the rubber packing 44 to the primary space R1 is further effectively suppressed.

  As shown in FIG.13 (c), the pressing surface which is the lower surface of the pressing part P from the position corresponding to the standing part provided in the pressed surface 44A of the rubber packing 44 is directed from the flat surface to the secondary side space R2. A single bead B may be formed on an inclined surface that is an ascending slope, and is annularly continuous along the circumferential direction on each of the flat surface and the inclined surface. By making the shape of the pressed surface of the rubber packing 44 and the pressing surface of the pressing part P as described above, the position of the membrane element 2 in the casing body 40 can be adjusted to an appropriate position. .

  When the raw water is pressurized and supplied from the raw water header pipe 22, the raw water flows into the fluid flow hole 3 opened at the lower end surface of the membrane element 2 and rises, and the filtration formed on the inner surface of the fluid flow hole 3. Filtration water flows out from the peripheral surfaces 6c and 6d (see FIG. 4) after being filtered by the membrane 4.

  The filtered water filtered by the membrane element 2 flows out into the space formed between the peripheral surface of the membrane element 2 and the inner wall surface of the casing body 40, and presses the upper flange 43 and the rubber packing 44 of the casing body 40. The space 56 via the space between the packing cover 90 and the space 56 (see FIG. 10D) between the inner lower edge 51 and the outer lower edge 52 of the upper lid 50. Water is introduced into the filtrate outlet pipe 54 from the lower opening 54b of the filtrate outlet pipe 54 communicating with the filtrate. In addition, the fluid flow hole 3 shown in FIG. 5 is the fluid flow hole 3 of the center part shown in FIG.

  The membrane element 2 obtained by firing the ceramic molded body has a certain height variation. However, the upper lid 50 is configured to be vertically adjustable with respect to the flange portion 43 of the casing body 40 by the pressing mechanisms 60 and 70, and the filtered water outflow pipe 54 formed in the upper lid 50 is filtered water. By being configured to be vertically adjustable with respect to the header pipe 26, it is configured to be able to absorb height variations. Of course, since each position adjusting part is provided with an O-ring, the watertight structure is maintained.

  Further, when the upper lid 50 and the rubber packing 44 are removed, the upper end of the membrane element 2 protrudes from the upper flange portion 43 of the casing body 40, that is, the end edge portion whose diameter has been expanded from the center portion. Since a gap is formed between the membrane element 2 and the peripheral surface, the detachment operation and insertion operation of the membrane element 2 from the casing body 40 can be easily performed.

  That is, since the raw water supply pipe 38 and the filtrate water outflow pipe 54 are disposed at the end of the casing in the longitudinal direction of the casing body 40, preferably in a substantially parallel direction, the raw water supply pipe 38 and the filtrate water are disposed. The outflow pipe 54 does not protrude greatly from the peripheral surface of the casing to the side, and the installation space can be reduced in plan view.

  Moreover, since the casing includes a cylindrical main body 40 and a lid 50 and the filtrate water outflow pipe 54 is provided in the lid 50, the end of the filtrate water outflow pipe is connected to the peripheral surface of the casing. Compared to such a mode, a space for arranging the filtrate outflow pipe on the peripheral surface of the casing is not necessary, and a significant space saving can be achieved in a plan view.

  An inner lower edge portion 51 of the lid 50 that also functions as a partition wall between the primary side space R1 and the secondary side space R2 is configured to hold the membrane element 2 via a rubber packing 44 and a cylindrical protrusion 92. As a result, the space formed between the peripheral surface of the membrane element 2 and the inner surface of the main body 40 and the end of the filtrate outlet pipe 54 are in a watertight state, so that raw water is not mixed into the filtrate. Is done.

Hereinafter, another embodiment of the seal member holding mechanism K will be described.
In the embodiment described above, the seal member holding mechanism K is provided on the pressed surface 44A of the rubber packing 44 pressed by the pressing portion P, and is configured by an inclined wall that gradually rises from the pressing portion P toward the secondary side space R2. Although the example comprised by the standing rising part was demonstrated, as shown to Fig.14 (a), even if the rising part is comprised by the level | step-difference part which rises stepwise from the press part P to the secondary side space R2 side. Good.

  Further, as shown in FIG. 14 (b), the primary space R1 and the secondary space R2 are separated from each other at the position pressed by the pressing portion P so that a groove portion into which the pressing portion P is inserted is formed. You may be comprised by the level | step-difference part which stands | starts up stepwise to each. Moreover, you may be comprised by the inclination part which rises gradually in each of primary side space R1 and secondary side space R2 on the boundary pressed by the press part P.

  The seal member holding mechanism K may be provided in the pressing portion P. As shown in FIG. 14C, the pressed surface 44 </ b> A of the rubber packing 44 is formed flat and extends from the pressing portion P toward the primary space R <b> 1 so as to contact the inner peripheral surface of the rubber packing 44. Further, the seal member holding mechanism K may be configured by the extended portion P1.

  As shown in FIG. 14D, a flange portion 44B is formed such that the lower end of the rubber packing 44 extends radially outward, and the outer periphery of the pressing portion P bends radially outward and extends further downward. By taking out, the structure which presses the said collar part 44B from the top with the end surface may be sufficient.

  As shown in FIG. 14E, an annular convex portion 44C is formed on the pressed surface 44A of the rubber packing 44, and an annular groove portion K is formed on the pressing surface of the pressing portion P so as to be fitted on the convex portion 44C. May be used as the seal member holding mechanism K.

  That is, the seal member holding mechanism K may be formed on the seal member 44, may be formed on the pressing portion P, or may be pressed against the seal member 44 so as to hold the seal member 44 in cooperation. It may be formed in both of the parts P.

  Further, the pressing portion P is not limited to the inner lower edge portion 51 formed integrally with the lid member 50 and may be formed separately from the lid member 50.

  The basic configuration of the membrane module according to the present invention has been described above with reference to the drawings. However, the specific configuration, size, shape, material, and the like of each part of the membrane module are limited to the modes described in the above-described embodiments. It is needless to say that the present invention can be selected and designed as appropriate within the scope of the effects of the present invention.

1: Membrane module 2: Membrane element 3: Fluid flow hole 20: Membrane module 22: Raw water header pipe 24: Cleaning header pipe 26: Filtration water header pipe 30: Casing (base that functions as a lid)
38: Raw water supply pipe 40: Casing (main body)
44: Seal member (rubber packing)
50: Casing (upper cover)
51 (P): Pressing part (inner lower edge part)
54: Filtration water outflow pipe 60: Support part 70: Holding part

Claims (6)

A membrane module comprising a membrane element and a casing in which the membrane element is housed,
An annular sealing member disposed at the periphery of the end face of the membrane element;
A pressing part that presses the membrane element through the sealing member and divides the primary side space and the secondary side space in the casing;
A membrane module, wherein a seal member holding mechanism that prevents communication between the primary side space and the secondary side space due to movement or displacement of the seal member is provided in the seal member or the pressing portion. The casing includes a cylindrical member and a lid member disposed at an end portion in the axial direction of the cylindrical member,
The pressing portion is configured by a cylindrical portion that is formed to project from the inner peripheral surface of the lid member in the axial direction.
The membrane module according to claim 1, wherein the lid member is provided with a first opening communicating with the primary space and a second opening communicating with the secondary space.   The seal member holding mechanism is configured by a rising portion that is provided on a pressed surface of the seal member that is pressed by the pressing portion, and that is formed so as to rise from the pressing portion toward the secondary space. The membrane module according to claim 1 or 2, wherein   The membrane module according to claim 3, wherein the rising portion is formed with a downward slope toward the primary space.   The said sealing member holding | maintenance mechanism is an extension part extended and formed from the said press part to the primary side space side so that it may contact | abut with the internal peripheral surface of the said seal member. The membrane module described.   The membrane module according to any one of claims 1 to 5, wherein an end face shape of the membrane element and a contour shape of the seal member are substantially polygonal.

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