JP5132684B2 - Fluid supply joint for membrane cleaning and filtration device - Google Patents

Description

  The present invention relates to a membrane cleaning fluid supply joint for supplying a membrane cleaning fluid into a lower pipe of the filtration membrane module at the time of membrane cleaning of the filtration membrane module, and a filtration apparatus including the membrane cleaning fluid supply joint. is there.

For example, in Japanese Patent Application Laid-Open No. 2001-079364, a gas is introduced into a pipe that sends raw water to the filtration membrane module, and at the same time the gas is introduced into the filtration membrane module through a raw water inlet installed in the filtration membrane module. In addition, it is described that gas or liquid is introduced into the filtered water side of the filtration membrane to allow the gas or liquid to permeate from the filtered water side of the membrane to the raw water side.
Japanese Patent Application Laid-Open No. 2001-079364

  However, in the above-mentioned conventional example, the supply amount of air or chemicals supplied into the lower pipe of the filtration membrane module at the time of cleaning the membrane of the filtration membrane module increases near the discharge port, and far from the discharge port. There is a problem that the number of the filter membranes is reduced and is not uniformly supplied to the entire filtration membrane, and one side of the filtration membrane cannot be sufficiently cleaned.

  The present invention solves the above-described problems, and the object of the present invention is to ensure that the membrane cleaning fluid supplied into the lower pipe of the filtration membrane module is uniformly distributed throughout the filtration membrane when the filtration membrane module is cleaned. It is an object of the present invention to provide a membrane cleaning fluid supply joint that can be supplied and a filtration device including the membrane cleaning fluid supply joint.

  In order to achieve the above object, the first configuration of the membrane cleaning fluid supply joint according to the present invention is a membrane cleaning for supplying a membrane cleaning fluid into the lower pipe of the filtration membrane module during the membrane cleaning of the filtration membrane module. A fluid supply joint, comprising a joint member for watertightly connecting the lower pipe of the filtration membrane module and the branch pipe of the header pipe, the lower pipe inserted from one end of the joint member, A cylindrical portion into which the branch pipe is inserted from the other end, and a predetermined gap between the inner peripheral surface of the cylindrical portion and at least one of the outer peripheral surface of the lower pipe and the outer peripheral surface of the branch pipe And a discharge port for discharging the film cleaning fluid to the outer peripheral surface of the lower pipe or the branch pipe is provided at a portion of the cylindrical portion where the gap is provided, and the discharge port Supply supply for supplying the membrane cleaning fluid. Wherein the but are connected.

  Further, a second configuration of the membrane cleaning fluid supply joint according to the present invention is the first configuration, in which the joint member is formed of the lower pipe and the branch pipe with respect to the lower pipe and the branch pipe. The membrane that is movable in the axial direction, and that moves the joint member in the axial direction of the lower pipe and the branch pipe to adjust the flow path resistance of the membrane cleaning fluid and is supplied to the lower pipe The supply amount of the cleaning fluid can be adjusted.

  According to a third configuration of the membrane cleaning fluid supply joint according to the present invention, in the first or second configuration, the joint member is sheathed on the lower pipe and the branch pipe, and Screw portions that can be screwed into screw portions provided at both ends of the outer periphery are accommodated in a pair of cap nuts provided in the inner peripheral portion and in the cap nut, and are respectively externally mounted on the lower pipe or the branch pipe. The screw portion provided on the inner peripheral portion of the cap nut is screwed and fastened to the screw portions provided on both outer peripheral ends of the cylindrical portion, whereby the end surface of the cylindrical portion and the outer peripheral surface of the lower pipe or the branch And a pair of sealing members that are pressed against and sealed between the outer peripheral surface of the pipe, and the lower pipe and the branch pipe are connected in a watertight manner.

  Moreover, the 4th structure of the fluid supply joint for membrane cleaning which concerns on this invention is the structure in any one of said 1st-3rd, The internal peripheral surface of the said cylinder part in which the said discharge port is provided is the said cylinder part. The taper surface is inclined at a predetermined angle with respect to the axial direction.

  Further, a fifth configuration of the membrane cleaning fluid supply joint according to the present invention is the configuration according to any one of the first to fourth configurations, wherein a concave groove communicating with the discharge port is formed on the inner peripheral surface of the cylindrical portion. The recessed groove is formed over the entire inner peripheral surface around the axis of the cylindrical portion.

  Further, in a sixth configuration of the membrane cleaning fluid supply joint according to the present invention, in any one of the first to fifth configurations, at least a tubular portion of the joint member is transparent, and the discharge port is disposed in the tubular portion. It is possible to visually observe that the film cleaning fluid discharged from the liquid is uniformly dispersed over the entire circumference of the cylindrical portion and the flow rate becomes uniform and is supplied into the lower pipe.

  According to a seventh configuration of the membrane cleaning fluid supply joint according to the present invention, in the first configuration, the membrane cleaning fluid is air, and the inner peripheral surface of the cylindrical portion and the outer periphery of the lower pipe A predetermined gap is provided between the pipe and the discharge port, and the discharge port is provided in a portion of the cylinder portion where the gap is provided to discharge air to the outer peripheral surface of the lower pipe. .

  In addition, the configuration of the filtration device according to the present invention includes a filtration membrane module having a filtration membrane, and a membrane cleaning fluid that supplies a membrane cleaning fluid into a lower pipe of the filtration membrane module during the filtration membrane cleaning of the filtration membrane module. A filtration apparatus comprising a supply joint and a supply pipe for supplying the membrane cleaning fluid to the membrane cleaning fluid supply joint, wherein the membrane cleaning fluid supply joint includes a lower pipe and a header of the filtration membrane module A joint member for watertightly connecting a branch pipe of the pipe, and the joint member includes a cylindrical portion into which the lower pipe is inserted from one end and the branch pipe is inserted from the other end. A predetermined gap is provided between the inner peripheral surface of the cylindrical portion and at least one of the outer peripheral surface of the lower pipe and the outer peripheral surface of the branch pipe, and the portion of the cylindrical portion where the gap is provided Cleaning the membrane on the outer peripheral surface of the lower pipe Discharge port is provided for discharging the fluid, the supply pipe to the discharge port, characterized in that it is connected.

  According to the first configuration of the membrane cleaning fluid supply joint according to the present invention, the membrane cleaning fluid is supplied from the discharge port provided in the cylindrical portion of the joint member to the outer peripheral surface of the lower pipe or the outer peripheral surface of the branch pipe. When discharged, the discharged membrane cleaning fluid circulates along the outer peripheral surface of the lower pipe or the outer peripheral surface of the branch pipe, and uniformly in the lower pipe from the end of the lower pipe or the end of the branch pipe in the circumferential direction. The membrane cleaning fluid can be supplied to the substrate.

  According to the second configuration of the membrane cleaning fluid supply joint of the present invention, the lower pipe or the branch pipe is obtained by moving the joint member in the axial direction of the lower pipe and the branch pipe with respect to the lower pipe and the branch pipe. As a result, the flow rate can be adjusted by adjusting the flow resistance of the membrane cleaning fluid flowing through the gap.

  According to the third configuration of the membrane cleaning fluid supply joint according to the present invention, the pair of cap nuts are screwed and fastened to the screw portions provided at both ends of the cylindrical portion, so that the end surface and the lower portion of the cylindrical portion are The space between the outer peripheral surface of the pipe and between the end surface of the cylindrical portion and the outer peripheral surface of the branch pipe can be sealed in a water-tight manner with a sealing member, so that reliable sealing is possible.

  According to the fourth configuration of the membrane cleaning fluid supply joint according to the present invention, the inner peripheral surface of the cylindrical portion provided with the discharge port is configured by a tapered surface inclined at a predetermined angle with respect to the axial direction of the cylindrical portion. Therefore, the membrane cleaning is performed in the gap formed between the inner peripheral surface provided with the discharge port for the membrane cleaning fluid in the cylindrical portion and the outer peripheral surface of the lower pipe or the outer peripheral surface of the branch pipe facing the discharge port. The flow rate can be adjusted by adjusting the flow resistance of the working fluid.

  According to the fifth configuration of the membrane cleaning fluid supply joint according to the present invention, the membrane cleaning fluid discharged from the discharge port via the concave groove is applied to the outer peripheral surface of the lower pipe or the outer peripheral surface of the branch pipe. Therefore, the membrane cleaning fluid can be supplied into the lower pipe uniformly in the circumferential direction from the end of the lower pipe or the end of the branch pipe. Further, the flow rate can be adjusted by appropriately setting the size and shape of the groove and adjusting the flow resistance of the membrane cleaning fluid in the groove.

  According to the sixth configuration of the membrane cleaning fluid supply joint according to the present invention, since at least the cylindrical portion of the joint member is transparent, the membrane cleaning fluid discharged from the discharge port in the cylindrical portion is surrounded by the entire circumference of the cylindrical portion. It can be visually observed that the liquid is uniformly dispersed and the flow rate is uniformly discharged.

  In the seventh configuration of the membrane cleaning fluid supply joint according to the present invention, the membrane cleaning fluid is air, and a predetermined gap is provided between the inner peripheral surface of the tubular portion of the joint member and the outer peripheral surface of the lower pipe. The discharge port is provided at a portion of the cylindrical portion where the gap is provided, and discharges air to the outer peripheral surface of the lower pipe. According to this configuration, the gap formed between the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the lower pipe is formed over the entire inner peripheral surface of the cylindrical portion around the axis of the cylindrical portion to adjust the flow rate. It becomes an area. When air is discharged from the discharge port to the wall surface of the outer peripheral surface of the lower pipe, the air temporarily accumulates in the flow rate adjustment region and is uniformly supplied into the lower pipe from the end of the lower pipe in the circumferential direction.

  According to the filtration device of the present invention, when the membrane cleaning fluid is discharged from the discharge port provided in the tubular portion of the joint member to the outer peripheral surface of the lower pipe or the outer peripheral surface of the branch pipe, the discharged membrane cleaning The circulatory fluid circulates along the outer peripheral surface of the lower pipe or the outer peripheral surface of the branch pipe, and supplies the membrane cleaning fluid into the lower pipe uniformly in the circumferential direction from the end of the lower pipe or the end of the branch pipe. I can do it.

FIG. 1 is a cross-sectional explanatory view showing the configuration of a filtration apparatus equipped with a filtration membrane module connected by a flow rate adjusting joint according to a first embodiment of a membrane cleaning fluid supply joint of the present invention. FIG. 2A is a cross-sectional explanatory view showing the configuration of the flow rate adjusting joint according to the first embodiment of the membrane cleaning fluid supply joint of the present invention. FIG. 2B is an exploded perspective view showing the configuration of the flow rate adjusting joint according to the first embodiment of the membrane cleaning fluid supply joint of the present invention. FIG. 3 is a cross-sectional explanatory view showing a state in which the distance in the axial direction of the lower pipe between the discharge port for the membrane cleaning fluid provided in the cylinder part and the lower pipe end is adjusted, (a) The case where the distance between a discharge port and a lower piping edge part is short is shown, (b) shows the case where it is long compared with (a). FIG. 4A shows a flow rate adjusting joint according to a second embodiment of the membrane cleaning fluid supply joint of the present invention, and an example in which the inner peripheral surface of the cylindrical portion facing the outer peripheral surface of the lower pipe is configured by a tapered surface. FIG. FIG. 4B shows a flow rate adjusting joint according to a third embodiment of the membrane cleaning fluid supply joint of the present invention, and the inner peripheral surface of the cylindrical portion facing the outer peripheral surface of the branch pipe is formed by a tapered surface. It is a cross-sectional explanatory view showing an example. Fig.5 (a) shows the flow volume adjustment coupling which concerns on 2nd Embodiment of the fluid supply coupling for membrane cleaning of this invention, The example which comprised the internal peripheral surface of the cylinder part facing the outer peripheral surface of lower piping with the taper surface It is sectional drawing which expands and shows the edge part of lower piping in. FIG. 5B shows a flow rate adjusting joint according to a third embodiment of the membrane cleaning fluid supply joint of the present invention, and the inner peripheral surface of the cylindrical portion facing the outer peripheral surface of the branch pipe is configured by a tapered surface. In the example which was done, it is sectional drawing which expands and shows the edge part of a branch pipe. FIG. 6 shows a flow rate adjusting joint according to a fourth embodiment of the membrane cleaning fluid supply joint of the present invention, wherein the discharge port is communicated with an inner peripheral surface of a cylindrical portion where a discharge port for the membrane cleaning fluid is provided. It is a section explanatory view showing an example when a ditch is formed over the inner peripheral surface whole surface of this cylinder part. FIG. 7A is a perspective view showing a flow rate adjusting joint according to a fifth embodiment of the membrane cleaning fluid supply joint of the present invention. Moreover, FIG.7 (b) is sectional drawing which expands and shows a part of flow-rate adjustment coupling which concerns on 5th Embodiment of the fluid supply coupling for membrane washing | cleaning of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,1B ... Flow adjustment joint (fluid supply joint for membrane cleaning), 2 ... Filtration device, 3 ... Hollow fiber filtration membrane module (filtration membrane module), 4, 4B, 4C, 4D, 4E ... Joint member, 5 ... Stock solution supply header pipe (header pipe), 5a ... Branch pipe, 6 ... Lower pipe, 11 ... Discharge port, 9, 30 ... Cylinder part, 9a, 9b ... Male thread part, 9d ... Inner peripheral surface of cylinder part, 15 ... Supply piping, 17A, 17B ... tapered surface, 18 ... concave groove, 25 ... cap nut, 25a ... internal thread portion, 27 ... rubber packing (seal member).

  Embodiments of a membrane cleaning fluid supply joint according to the present invention will be specifically described with reference to the drawings. FIG. 1 is a cross-sectional explanatory view showing the configuration of a filtration apparatus equipped with a filtration membrane module connected by a flow rate adjusting joint according to a first embodiment of a membrane cleaning fluid supply joint of the present invention. 2 (a) and 2 (b) are a cross-sectional explanatory view and an exploded perspective view showing the configuration of the flow rate adjusting joint according to the first embodiment, and FIG. 3 shows a discharge port for the membrane cleaning fluid provided in the cylindrical portion, It is sectional explanatory drawing which shows a mode that the distance in the axial direction of this lower piping between lower piping edge parts is adjusted.

  As shown in FIG. 1, the filtration device 2 includes a hollow fiber filtration membrane module 3, a flow rate adjusting joint 1, and a supply pipe 15. The hollow fiber filtration membrane module 3 is a module that includes a hollow fiber filtration membrane. The flow rate adjusting joint 1 is a flow rate adjusting joint for supplying a membrane cleaning fluid into the lower pipe 6 of the hollow fiber filtration membrane module 3 when the hollow fiber membrane module 3 is cleaned. The flow rate adjusting joint 1 of the present embodiment is an example of a membrane cleaning fluid supply joint, and includes a discharge port 11, an orifice 19, and a joint member 4, and a flow rate when supplying the membrane cleaning fluid into the lower pipe 6. Adjustments can be made. In the present embodiment, air for scrubbing cleaning will be described as an example of the membrane cleaning fluid.

  In the figure, an element denoted by reference numeral 5 is a stock solution supply header pipe, and a branch pipe 5a of the stock solution supply header pipe 5 and a lower pipe 6 serving as a stock solution supply flow path of the hollow fiber filtration membrane module 3 are watertight by a joint member 4. Connected at. The joint member 4 is movable in the axial direction of the lower pipe 6 and the branch pipe 5a (vertical direction in FIG. 1) with respect to the lower pipe 6 and the branch pipe 5a. Are connected by a joint member 4 so as to be relatively movable in the axial direction (vertical direction in FIG. 1) of the lower pipe 6 and the branch pipe 5a.

  As shown in FIG. 2, the joint member 4 includes a transparent tubular portion 9 into which the lower pipe 6 is inserted from one end and the branch pipe 5a is inserted from the other end, and the lower pipe 6 and the branch. A pair of cap nuts 25 provided on the inner peripheral portion with female screw portions 25a that can be screwed into male screw portions 9a and 9b provided on both ends of the outer periphery of the tube portion 9 and respectively sheathed on the tube 5a; A male screw provided in the outer peripheral both ends of the cylindrical portion 9 with the female screw portion 25a provided in the inner peripheral portion of the cap nut 25 and housed in the lower pipe 6 or the branch pipe 5a. A pair of ring-shaped rubber packings (seal) that are pressed and sealed between the end surface 9c of the cylindrical portion 9 and the outer peripheral surface of the lower pipe 6 or the outer peripheral surface of the branch pipe 5a by screwing and fastening to the portions 9a and 9b. Member) 27 and the lower pipe 6 while being accommodated in the cap nut 25 Others are exterior respectively branch pipe 5a, it is constituted and a sliding ring 26 to protect slidably rubber packing 27 from the cap nut 25 side. The rubber packing 27 has a triangular cross section.

  The seal member is not limited to the ring-shaped rubber packing 27 having a triangular cross section, and various shapes of seal members can be applied, and an O-ring or the like may be used. The joint member 4 of the flow rate adjusting joint 1 connects the lower pipe 6 and the branch pipe 5a in a watertight manner by a watertight structure including a pair of cap nuts 25 and a pair of rubber packings 27 (seal members). In addition, the joint member 4 of the flow adjustment joint 1 is made of resin and has a structure resistant to corrosion.

  In FIG. 1, an element denoted by reference numeral 7 is a filtrate discharge header pipe, and a branch pipe 7 a of the filtrate discharge header pipe 7 and an upper pipe 8 serving as a filtrate discharge flow path of the hollow fiber filtration membrane module 3 are The lower pipe 6 and the branch pipe 5a are connected by the same joint member 4 as described above that is movable in the axial direction (vertical direction in FIG. 1). 2 is omitted from the joint member 4 that connects the branch pipe 7a of the filtrate discharge header pipe 7 and the upper pipe 8. As shown in FIG. Further, the hollow fiber filtration membrane module 3 is supported at the lower end portion of the outer case 13 by a support member (not shown).

  When the filtration operation shown in FIG. 1 is performed, the inside of the hollow fiber filtration membrane module 3 is passed from a raw solution tank (not shown) through a lower pipe 6 serving as a raw solution supply channel from a raw solution supply header pipe 5 by a raw solution supply pump. Is fed to the hollow fiber membrane of the hollow fiber filtration membrane module 3 from the inside to the outside (internal pressure filtration) or from the outside to the inside (external pressure filtration), and the filtrate is filtered out. It is accommodated in a filtrate tank (not shown) via a filtrate discharge header pipe 7 via an upper pipe 8 serving as a path.

  In the figure, the element denoted by reference numeral 10 is a return stock solution flow path, and a part of the stock solution that does not pass through the hollow fiber membrane is returned from the return stock solution flow path 10 to a stock solution tank (not shown).

  On the other hand, a predetermined gap δ is provided between the inner peripheral surface 9d of the cylindrical portion 9 of the joint member 4 and the outer peripheral surface 6a of the lower pipe 6 (FIGS. 2 and 3). A discharge port 11 for discharging air to the outer peripheral surface 6a of the lower pipe 6 or the wall surface of the outer peripheral surface 5a1 of the branch pipe 5a is provided at a portion where δ is provided, and air is supplied to the discharge port 11 A pipe header 12 is connected via a branch pipe 12 a and a supply pipe 15.

  In the above configuration, the predetermined gap δ is provided between the inner peripheral surface 9 d of the cylindrical portion 9 of the joint member 4 and the outer peripheral surface 6 a of the lower pipe 6, and the gap δ of the cylindrical portion 9 is provided. A discharge port 11 for discharging air to the wall surface of the outer peripheral surface 6 a of the lower pipe 6 is provided at a site, and an air supply pipe 15 is connected to the discharge port 11. Therefore, when air is discharged from the discharge port 11 to the wall surface of the outer peripheral surface 6a of the lower pipe 6, the discharged air follows the wall surface of the outer peripheral surface 6a of the lower pipe 6 or the outer peripheral surface 5a1 of the branch pipe 5a. Then, it goes around to the back side of the lower pipe 6 and is supplied from the end of the lower pipe 6 uniformly into the lower pipe 6 in the circumferential direction.

  In particular, in the present embodiment, air is used as the membrane cleaning fluid, and when air is discharged to the wall surface of the outer peripheral surface 6 a of the lower pipe 6, the discharged air is the wall surface of the outer peripheral surface 6 a of the lower pipe 6. And a rubber packing 27 formed between the inner peripheral surface 9d of the tubular portion 9 of the joint member 4 and the end surface of the tubular portion 9 and the outer peripheral surface 6a of the lower pipe 6 so as to be sealed by sealing. δ, that is, temporarily accumulates in the flow rate adjustment region 16. Thereafter, the air accumulated in the flow rate adjusting region 16 is supplied uniformly from the end 6 b of the lower pipe 6 into the lower pipe 6 in the circumferential direction. In addition, although the element shown with the code | symbol 19 in a figure is an orifice for supplying air uniformly to each hollow fiber filtration membrane module 3 connected in parallel, 9 d of inner peripheral surfaces of the cylinder part 9 of the joint member 4 are shown. By adjusting the gap δ formed between the outer peripheral surface 6a of the lower pipe 6 and the outer peripheral surface 5a1 of the branch pipe 5a as appropriate to adjust the volume of the flow rate adjustment region 16, the flow resistance comparable to that of the orifice 19 is obtained. The operation can be exerted, and the orifice 19 can be omitted.

  Further, at least the cylindrical portion 9 of the joint member 4 is made of a transparent resin (transparent member), and the air discharged from the discharge port 11 in the cylindrical portion 9 is uniformly distributed over the entire circumference of the cylindrical portion 9. In addition, it can be visually observed that the flow rate is discharged uniformly. Note that the tube portion 9 may be translucent, and it is sufficient if a film cleaning fluid such as air is visible.

  Next, an operation when the joint member 4 of the flow rate adjusting joint 1 is moved in the axial direction of the lower pipe 6 and the branch pipe 5a will be described. As shown in FIG. 2A, when the lower pipe 6 is moved downward in the axial direction of the lower pipe 6 and the branch pipe 5a with respect to the branch pipe 5a, the end of the lower pipe 6 is obtained. The separation distance D between the portion 6b and the end portion 5a2 of the branch pipe 5a is narrowed (see the two-dot chain line in FIG. 2A), and conversely when moved upward, the end portion 6b of the lower pipe 6 and the branch pipe The distance D between the end 5a2 of 5a increases. Thus, the separation distance D between the end 6b of the lower pipe 6 and the end 5a2 of the branch pipe 5a can be adjusted by moving the lower pipe 6 relative to the branch pipe 5a in the axial direction. Similarly, the distance D between the lower pipe 6, the end 6b, and the end 5a2 of the branch pipe 5a can be adjusted by moving the branch pipe 5a relative to the lower pipe 6 in the axial direction. .

  3A and 3B, the lower pipe 6 and the branch pipe 5a are already installed at predetermined positions, and the separation distance D between the lower pipe 6 and the branch pipe 5a is constant. It is shown. Here, on the basis of the state shown in FIG. 3A, the cap nuts 25 at both ends of the joint member 4 are loosened, and the joint member 4 is moved in the axial direction (for example, upward) of the lower pipe 6 and the branch pipe 5a. It is moved to the state shown in FIG. Then, the distance L in the axial direction between the discharge port 11 and the end 6b of the lower pipe 6 increases, and the flow resistance of the air that flows through the gap δ (flow rate adjustment region 16) and is supplied to the lower pipe 6 is Increase. As a result, the amount of air supplied to the lower pipe 6 decreases. Conversely, when the joint member 4 is moved downward so that the state shown in FIG. 3B is changed to the state shown in FIG. 3A, the discharge port 11 and the end 6b of the lower pipe 6 are connected. The distance L in the axial direction decreases, the flow resistance of the air decreases, and the amount of air supplied to the lower pipe 6 increases.

  According to such a configuration, the lower pipe 6 or the branch pipe 5a inserted into the joint member 4 is relatively moved in the axial direction of the lower pipe 6 and the branch pipe 5a, so that the end 6b and the branch of the lower pipe 6 are branched. The distance D in the axial direction of the lower pipe 6 and the branch pipe 5a between the end 5a2 of the pipe 5a can be adjusted.

  According to the above configuration, the air discharge port 11 is obtained by moving the joint member 4 in the axial direction of the lower pipe 6 and the branch pipe 5a with respect to the lower pipe 6 and the branch pipe 5a arranged at predetermined positions. And the distance L in the axial direction (the axial direction of the lower pipe 6 and the branch pipe 5a) between the lower pipe 6 and the end 6b of the lower pipe 6 can be adjusted. Thus, the flow rate can be adjusted by changing the volume of the flow rate adjusting region 16 and adjusting the air flow path resistance.

  As described above, according to the present embodiment, when air is discharged from the discharge port 11 provided in the cylindrical portion 9 of the joint member 4 to the outer peripheral surface 6 a of the lower pipe 6, the discharged air is discharged to the outer periphery of the lower pipe 6. It circulates along the wall surface of the surface 6a, wraps around to the back side of the lower pipe 6, and is uniformly supplied into the lower pipe 6 from the end 6a of the lower pipe 6 in the circumferential direction. As a result, the air can be uniformly supplied to the lower pipe 6.

  Note that the air discharge port 11 may be provided at a position facing the outer peripheral surface of the branch pipe 5a. When the air is discharged to the outer peripheral surface 5a1, the discharged air circulates along the wall surface of the outer peripheral surface 5a1 of the branch pipe 5a and wraps around the back side of the branch pipe 5a, and circulates from the end portion 5a1 of the branch pipe 5a. It rises uniformly in the direction and is supplied into the lower pipe 6. As a result, the air can be uniformly supplied to the lower pipe 6.

  Next, a membrane cleaning fluid supply joint according to a second embodiment of the present invention will be described with reference to FIGS. 4 (a) and 5 (a). 4A is a cross-sectional view showing a flow rate adjusting joint 1B as a membrane cleaning fluid supply joint according to the second embodiment, and FIG. 5A is an enlarged view of an end 6b of the lower pipe 6. FIG. It is. As shown in FIGS. 4A and 5A, the flow rate adjusting joint 1B includes a joint member 4B. The tube portion 9 of the joint member 4B is provided with a discharge port 11 for air as a membrane cleaning fluid at a position facing the outer peripheral surface 6a of the lower pipe 6, and the inner peripheral surface 9d of the tube portion 9 is The taper surface 17A is inclined by a predetermined angle θ with respect to the axial direction of the portion 9 (vertical direction in FIG. 4). More specifically, the upper inner diameter of the tapered surface 17A is wider than the lower inner diameter.

  By configuring the inner peripheral surface 9d of the cylindrical portion 9 provided with the air discharge port 11 with such a configuration by the tapered surface 17A inclined by a predetermined angle θ with respect to the axial direction of the cylindrical portion 9, the discharge port 11 is provided. The volume of the flow rate adjusting region 16 formed between the inner peripheral surface 9d of the cylindrical portion 9 at the position where the gas pipe is provided and the outer peripheral surface 6a of the lower pipe 6 facing the discharge port 11 is reduced by the tapered surface 17A. The axial direction of the pipe 6 and the branch pipe 5a can be changed in the radial direction.

  5A, the gap between the end 6a of the lower pipe 6 and the inner peripheral surface 9d of the cylindrical part 9 when the end 6b of the lower pipe 6 is arranged on the upper side. The width δa of δ (see the solid line in FIG. 5A) is such that the end portion 6a of the lower pipe 6 and the inner peripheral surface 9d of the cylindrical portion 9 when the end portion 6b of the lower pipe 6 is disposed on the lower side. Is wider than the width δb of the gap δ (see the two-dot chain line in FIG. 5A). Therefore, the flow resistance of the air supplied from the flow rate adjustment region 16 into the lower pipe 6 is smaller when the lower pipe 6 is arranged on the upper side than when the lower pipe 6 is arranged on the lower side. ing. Therefore, by moving the joint member 4B in the axial direction of the lower pipe 6 and the branch pipe 5a, the flow rate can be adjusted efficiently by adjusting the air flow resistance. In addition, the other structure which abbreviate | omitted description by this embodiment is substantially the same as that of 1st Embodiment, The flow adjustment joint which concerns on 1st Embodiment also by the flow adjustment joint 1B which concerns on this embodiment The same effect as 1 can be expected.

  Next, a membrane cleaning fluid supply joint according to a third embodiment of the present invention will be described with reference to FIGS. 4 (b) and 5 (b). FIG. 4B is a sectional view showing a flow rate adjusting joint 1C as a membrane cleaning fluid supply joint according to the third embodiment, and FIG. 5B is an enlarged view showing an end portion 5a2 of the branch pipe 5a. It is. As shown in FIGS. 4B and 5B, the flow rate adjusting joint 1C includes a joint member 4C. The tube portion 9 of the joint member 4C is provided with a discharge port 11 for air as a membrane cleaning fluid at a position facing the outer peripheral surface 5a1 of the branch pipe 5a, and the inner peripheral surface 9d of the tube portion 9 is The taper surface 17B is inclined by a predetermined angle θ with respect to the axial direction of the portion 9 (vertical direction in FIG. 4). More specifically, the taper surface 17B has a lower inner diameter that is wider than an upper inner diameter.

  By configuring the inner peripheral surface 9d of the cylindrical portion 9 provided with the air discharge port 11 with such a configuration by the tapered surface 17B inclined by a predetermined angle θ with respect to the axial direction of the cylindrical portion 9, the discharge port 11 is provided. The volume of the flow rate adjusting region 16 formed between the inner peripheral surface 9d of the cylindrical portion 9 and the outer peripheral surface 5a1 of the branch pipe 5a facing the discharge port 11 is lowered by the tapered surface 17B. The axial direction of the pipe 6 and the branch pipe 5a can be changed in the radial direction.

  Further, as shown in FIG. 5 (b), when the end portion 5a2 of the branch pipe 5a is arranged on the lower side, it is between the end portion 5a2 of the branch pipe 5a and the inner peripheral surface 9d of the cylindrical portion 9. The width δc of the gap δ (see the solid line in FIG. 5A) is such that the end portion 5a2 of the branch pipe 5a and the inner peripheral surface 9d of the cylindrical portion 9 when the end portion 5a2 of the branch pipe 5a is disposed on the upper side. Is wider than the width δd of the gap δ (see the two-dot chain line in FIG. 5A). Therefore, the flow resistance of the air supplied from the flow rate adjustment region 16 into the lower pipe 6 is smaller when the branch pipe 5a is disposed on the lower side than when the branch pipe 5a is disposed on the upper side. ing. Therefore, by moving the joint member 4C in the axial direction of the lower pipe 6 and the branch pipe 5a, the flow rate can be adjusted efficiently by adjusting the air flow resistance. In addition, the other structure which abbreviate | omitted description by this embodiment is substantially the same as that of 1st Embodiment, The flow adjustment joint which concerns on 1st Embodiment also by 1 C of flow adjustment joints which concern on this embodiment The same effect as 1 can be expected.

Next, a membrane cleaning fluid supply joint according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 6 is a cross-sectional view showing a flow adjustment joint 1D as a membrane cleaning fluid supply joint according to the fourth embodiment, and the flow adjustment joint 1D includes a joint member 4D as shown in FIG. The cylindrical portion 9 of the joint member 4 </ b> D is provided with a discharge port 11 for air as a membrane cleaning fluid at a position facing the outer peripheral surface 6 a of the lower pipe 6.

  Further, a concave groove 18 having a square cross section communicating with the discharge port 11 is formed on the inner peripheral surface 9 d of the cylindrical portion 9. The concave groove 18 is formed over the entire circumference of the inner peripheral surface 9d around the axis of the cylindrical portion 9. Although not shown, the discharge port 11 is provided at a position facing the outer peripheral surface 5a1 of the branch pipe 5a, communicates with the discharge port 11, and is formed over the entire inner peripheral surface 9d around the axis of the cylindrical portion 9. A recessed groove may be provided.

  In this configuration, that is, the concave groove 18 in which the discharge port 11 communicates with the inner peripheral surface 9d of the cylindrical portion 9 provided with the air discharge port 11 extends over the entire inner peripheral surface 9d of the cylindrical portion 9. According to the formed structure, the air discharged from the discharge port 11 easily circulates along the outer peripheral surface 6a of the lower pipe 6 or the outer peripheral surface 5a1 of the branch pipe 5a via the concave groove 18. Thus, air can be supplied uniformly into the lower pipe 6 in the circumferential direction from the end 6b of the lower pipe 6 or the end 5a2 of the branch pipe 5a.

  In addition to the cross-sectional square shape, the concave groove 18 can be applied to various shapes such as a semicircular cross-sectional shape, a semi-elliptical cross-sectional shape, a semi-elliptical cross-sectional shape, and a triangular cross-sectional shape. Thus, the flow rate of the air can be adjusted by adjusting the flow resistance of the air in the concave groove 18. In addition, the other structure which abbreviate | omitted description by this embodiment is substantially the same as that of 1st Embodiment, The flow adjustment joint which concerns on 1st Embodiment also by the flow adjustment joint 1D which concerns on this embodiment The same effect as 1 can be expected.

  Next, a membrane cleaning fluid supply joint according to a fifth embodiment of the present invention will be described with reference to FIG. FIG. 7 shows a flow rate adjusting joint 1E as a membrane cleaning fluid supply joint according to the fifth embodiment, FIG. 7 (a) is a perspective view of the flow rate adjusting joint 1E, and FIG. 7 (b) is a flow rate adjusting joint 1E. FIG.

  As shown in FIG. 7, the flow rate adjusting joint 1 </ b> E includes a joint member 4 </ b> E that connects the lower pipe 6 and the branch pipe 5 a of the header pipe 5 with an O-ring (watertight structure) 35. The joint member 4E includes a cylindrical portion 30 into which the lower pipe 6 is inserted from one end and the branch pipe 5a is inserted from the other end. The cylindrical portion 30 includes two halved members 31 and 32 having a circular arc cross section in which the cylindrical shape is halved. Clamp pieces 31 a and 32 a extend along the overlapping edge portions of the half members 31 and 32. The half members 31, 32 are integrated with each other by clamping pieces 31 a, 32 a to each other and being fastened by a bolt 33. O-rings 35 are internally provided at both ends of the cylindrical portion 30, and the clamped pieces 31 a and 32 a are fastened by bolts 33 so that the internal O-ring 35 is connected to the outer peripheral surface 6 a and the branch pipe of the lower pipe 6. The outer peripheral surface 5a1 of 5a is pressed and contacted to form a watertight structure.

  A predetermined gap δ is provided as a flow rate adjustment region 16 between the inner peripheral surface of the cylindrical portion 30 and the outer peripheral surface 6 a of the lower pipe 6, and the outer periphery of the lower pipe 6 is provided at the portion where the gap δ is provided. A discharge port 11 for discharging air as a film cleaning fluid is provided on the surface 6a, and a supply pipe 15 for supplying air to the discharge port 11 is connected thereto.

  According to the flow rate adjusting joint 1E according to the present embodiment, when air is discharged from the discharge port 11 provided in the cylindrical portion 30 of the joint member 4E to the outer peripheral surface 6a of the lower pipe 6, the discharged air is discharged into the lower pipe. 6 circulates along the wall surface of the outer peripheral surface 6 a and wraps around to the back side of the lower pipe 6, and is uniformly supplied from the end 6 a of the lower pipe 6 into the lower pipe 6 in the circumferential direction. As a result, air can be uniformly supplied into the lower pipe 6.

  As mentioned above, although this invention was demonstrated based on each embodiment, this invention is not limited to said embodiment. For example, in the above embodiment, air for scrubbing cleaning of the membrane is exemplified as the membrane cleaning fluid. However, in order to decompose and clean dirt by contacting nitrogen or other gas for scrubbing cleaning or a hollow fiber membrane. It may be a gas such as ozone or hydrogen peroxide. Further, the membrane cleaning fluid may be a chemical solution for chemical cleaning. In this case, it is desirable that the chemical solution has a specific gravity lighter than the stock solution supplied into the filtration membrane module.

Claims (8)

A membrane cleaning fluid supply joint for supplying a membrane cleaning fluid into the lower pipe of the filtration membrane module at the time of membrane cleaning of the filtration membrane module,
A joint member for watertightly connecting the lower pipe of the filtration membrane module and the branch pipe of the header pipe;
The joint member is
The lower pipe is inserted from one end, and the tubular part is inserted from the other end.
A predetermined gap is provided between the inner peripheral surface of the cylindrical portion and at least one of the outer peripheral surface of the lower pipe and the outer peripheral surface of the branch pipe, and in the portion where the gap of the cylindrical portion is provided, A discharge port for discharging the film cleaning fluid is provided on the outer peripheral surface of the lower pipe or the branch pipe, and a supply pipe for supplying the film cleaning fluid is connected to the discharge port. A fluid supply joint for membrane cleaning, characterized in that   The joint member is movable in the axial direction of the lower pipe and the branch pipe with respect to the lower pipe and the branch pipe, and the joint member is moved in the axial direction of the lower pipe and the branch pipe. 2. The membrane cleaning fluid supply according to claim 1, wherein a supply amount of the membrane cleaning fluid supplied to the lower pipe can be adjusted by adjusting a flow path resistance of the membrane cleaning fluid. Fittings.   The joint member is a pair of cap nuts provided on the inner peripheral portion with a screw portion that is externally mounted on the lower pipe and the branch pipe and that can be screwed into screw portions provided at both outer peripheral end portions of the cylindrical portion. And screw portions provided in the outer peripheral end portions of the cylindrical portion, and screwed in the inner peripheral portion of the cap nut and housed in the lower pipe or the branch pipe, respectively. A pair of sealing members that are pressed and sealed between the end surface of the cylindrical portion and the outer peripheral surface of the lower pipe or the outer peripheral surface of the branch pipe by screwing and fastening to the lower pipe, 3. The membrane cleaning fluid supply joint according to claim 1, wherein the branch pipe is connected in a watertight manner.   The inner peripheral surface of the cylinder part provided with the discharge port is configured by a tapered surface inclined at a predetermined angle with respect to the axial direction of the cylinder part. Fluid supply joint for membrane cleaning.   A concave groove communicating with the discharge port is formed on the inner peripheral surface of the cylindrical portion, and the concave groove is formed over the entire inner peripheral surface around the axis of the cylindrical portion. The fluid supply joint for membrane cleaning according to any one of claims 1 to 4.   At least the tube portion of the joint member is transparent, and the film cleaning fluid discharged from the discharge port in the tube portion is uniformly distributed over the entire circumference of the tube portion and the flow rate becomes uniform. The membrane cleaning fluid supply joint according to any one of claims 1 to 5, wherein the supply to the lower pipe is made visible. The membrane cleaning fluid is air,
A predetermined gap is provided between the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the lower pipe,
2. The membrane cleaning fluid supply joint according to claim 1, wherein the discharge port is provided at a portion of the cylindrical portion where the gap is provided and discharges air to the outer peripheral surface of the lower pipe. A filtration membrane module having a filtration membrane, a membrane cleaning fluid supply joint for supplying a membrane cleaning fluid into a lower pipe of the filtration membrane module when cleaning the filtration membrane module, and a membrane cleaning fluid supply joint A filtration device comprising a supply pipe for supplying the membrane cleaning fluid,
The membrane cleaning fluid supply joint includes a joint member for connecting a lower pipe of the filtration membrane module and a branch pipe of the header pipe in a watertight structure,
The joint member is
The lower pipe is inserted from one end, and the tubular part is inserted from the other end.
A predetermined gap is provided between the inner peripheral surface of the cylindrical portion and at least one of the outer peripheral surface of the lower pipe and the outer peripheral surface of the branch pipe, and in the portion where the gap of the cylindrical portion is provided, A filtration device, wherein a discharge port for discharging the film cleaning fluid is provided on an outer peripheral surface of the lower pipe, and the supply pipe is connected to the discharge port.

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