JP4846339B2 - Air diffuser and diffuser system - Google Patents

Description

  The present invention relates to an air diffuser installed in an aeration tank used in an organic wastewater treatment system centering on sewage treatment, and an air diffuser system using the same.

  At present, a diffuser plate is installed in a diffuser installed in an aeration tank of many sewage treatment plants.

  Traditionally, porcelain diffusers were used, but after that they were light and easy to work with, and the size of the bubbles could be changed easily, making it easy to manufacture and cheap plastic diffusers. Became. These are the same size as the porcelain diffuser plate in consideration of replacement with the porcelain diffuser plate, and the plastic diffuser plate is a diffuser plate for the porcelain diffuser plate. It can be easily replaced using the holder as it is.

Furthermore, instead of the diffuser plate and the diffuser cylinder made of the porous polymer material, the ultrafine bubble membrane diffuser has come to be used due to its high performance.
JP 2003-024974 A JP 2003-001290 A

  However, since the membrane diffuser proposed so far is a disk type or a tube type, the effective foaming area per installation area cannot be increased. In addition, Patent Document 1 discloses a rectangular membrane diffuser, but the structure for attaching to a pipe is complicated.

  The present invention provides an air diffuser that can increase the effective foaming area per installation area and can be easily attached to a pipe for sending pressurized air, and an air diffuser system using the air diffuser. This is a problem.

The invention of claim 1 includes a rectangular elastic porous body, a support body that supports the elastic porous body from below and has an orifice for pressurized air, and a fixing member that integrally fixes the elastic porous body to the support body. A diffuser,
The support body includes a support part that supports the elastic porous body from below, and an attachment part to a pipe for sending pressurized air connected to the support part, and the rectangular elastic porous body has a box having an opening. The air diffuser has a mold shape, and the support portion is disposed in the elastic porous body.

  The rectangular elastic porous body of the present invention is obtained by processing a large number of fine ventilation holes in an elastic body obtained by molding an elastic material, and the shape thereof is square when viewed from above. (Square, rectangular, rhombus, etc.), and the whole shape is a box shape having an opening. When the aeration operation is not performed, that is, when the pressurized air from the pipe for sending pressurized air is not supplied below the elastic porous body, the upper flat portion of the elastic porous body has a sufficient thickness. Although it is preferable, even if it is not provided, the strength and shape of the elastic body can be maintained by arranging the support.

  An orifice for guiding the pressurized air sent from the pressurized air sending pipe to the lower surface of the elastic porous body passes through the support. This orifice is preferably located approximately at the center of the elastic porous body in the diffuser. At the time of pressurization, the elastic porous body is expanded upward by the pressurized air passing through the orifice, so that fine holes are opened and fine bubbles are generated.

  This support body has a support part that supports the elastic porous body from below, and an attachment part to a pipe for sending pressurized air connected to the support part. Here, the support portion is installed below the rectangular elastic porous body to support the porous body, and its shape, particularly when viewed from above, is the same as the elastic porous body. preferable. The support part is disposed in the elastic porous body.

  The attachment portion is disposed below the support portion so as to be connected to the support portion, and is for attaching the elastic porous body to the pipe for sending pressurized air. The attachment mechanism is not limited, and a known method can be used.

  In the present invention, a fixing member is used to integrally fix the elastic porous body to the support. The fixing member fixes the elastic porous body and the support body disposed below the elastic porous body, and keeps the boundary between the elastic porous body and the support liquid-tight. For example, the square elastic porous body and the square support body The fixing member can be fixed in close contact with the periphery of the periphery.

The invention according to claim 2 is the above air diffuser in which the rectangular elastic porous body has a flange portion facing inward at the peripheral edge portion of the opening of the box, and the porous body surrounds the support portion.
Not only is the support part of the support body arranged in the box, but the porous body has a flange part, so that the elastic porous body can wrap the support part, and the adhesion between the support part and the elastic porous body Airtightness can be improved.
According to the invention of claim 3, the attachment portion is composed of an upper semi-cylindrical portion and a lower semi-cylindrical portion, and the compressed air at a position where the diffuser is attached in a state where the upper semi-cylindrical portion and the lower semi-cylindrical portion are combined It is said diffuser which is the shape which closely surrounds the pipe for sending from the outside.

  In the present invention, the attachment portion is composed of an upper semi-cylindrical portion and a lower semi-cylindrical portion. It is preferable that the upper semi-cylindrical part is integrally connected to the above-mentioned supporting part, and as a connecting method, the supporting part and the upper semi-cylindrical part are integrally molded from the beginning, or the supporting parts formed separately from each other. It is also possible to make a connection by forming a screw in the part and the upper semi-cylindrical part and fitting them together.

  The upper semi-cylindrical portion and the lower semi-cylindrical portion each have a shape formed of a part of a cylindrical shape, and preferably have a cylindrical shape when they are connected in combination at each end. The connection method of the both ends of an upper half cylinder part and a lower half cylinder part is not limited, A well-known method can be used.

  Further, the cylindrical portion formed when these upper and lower semi-cylindrical portions are connected is the above-mentioned support in the portion of the pipe for sending pressurized air, where the hole for discharging air from the pipe is provided. The pipe is tightly enclosed from the outside so that the orifice provided in the body communicates with the air discharge hole.

  According to a fourth aspect of the present invention, there is provided an air diffuser as described above, further comprising a leg portion between the attachment portion and the support portion, wherein the leg portion is integrally connected to the attachment portion and the support portion.

  The leg portion is, for example, a vertically long cylindrical member, and preferably has an orifice in a position communicating with the air discharge hole of the pipe and the orifice of the support. By having the legs, the distance between the pipe and the position where the fine bubbles are generated can be adjusted, and the diffuser can be installed in accordance with the shape of the installation location. The leg portion can also be connected to the upper semi-cylindrical portion by a screw structure provided at each end of the leg portion and the upper semi-cylindrical portion.

  In the air diffuser described above, the elastic porous body is obtained by molding a material having elasticity into a desired shape. Examples of the material of the porous body include ethylene propylene rubber (EPDM), silicon rubber, It can be selected from rubbers such as polyurethane, chloroprene rubber, nitrile rubber, fluoro rubber (for example, registered trademark Viton, PTFE), perfluoroelastomer and the like. Among these, ethylene propylene rubber is particularly preferable because it has high film strength and excellent heat resistance and water resistance. Further, fluororubber and perfluoroelastomer are preferable in terms of chemical resistance.

  The elastic porous body preferably has a thickness of 0.1 to 3.0 mm and has 10,000 to 1,000,000 fine ventilation holes per square meter. These vent holes are fine vent holes penetrating the upper plane portion, and are holes for releasing fine bubbles that are diffused. The thickness of the surface having the air holes is preferably 0.1 to 3.0 mm, and more preferably 0.4 to 2.0 mm.

  If the thickness is less than this range, the film strength cannot be maintained. The number of communication holes is 10,000 to 1 million per square meter, more preferably 100,000 to 1 million. If it exceeds this range, the strength of the film may decrease, and foamed bubbles will collide with each other and become large, so this is not preferable, and if it is less than this range, the number of bubbles will decrease and the original purpose will be reduced. Is not desirable because

  Furthermore, it is preferable that the surface having the vent hole is controlled so that the thickness is large at the central portion of the square shape and gradually decreases from the center toward the outer periphery. When the elastic porous body is pressurized from below, it is often carried out from an orifice arranged below the center of the surface having the air holes. It becomes easy and a big hole opens. If the thickness is the same over the entire surface, the center becomes a larger hole, and many large bubbles are generated from the center, and only a small amount of small bubbles are generated near the periphery, producing efficient fine bubbles. As a result, the effective foaming area is reduced and the oxygen transfer efficiency in the aeration tank is reduced.

  By controlling the thickness as described above, the thickness is smaller as the center is thicker and closer to the periphery, so the difference in the magnitude of the pressure received by the center and the portion near the periphery can be eliminated. It is possible to generate bubbles having a uniform size over the same rate. The thickness control as described above can be performed, for example, by accurately controlling the dimensions of the mold in the compression molding method.

  The material of the support is preferably at least one selected from steel plates, stainless steel plates, engineering plastics such as FRP and ABS, and plastics such as PP and PVC.

  The fixing member is made of steel plate, stainless steel plate, polysulfone, FRP, etc. so that the force pressing the outer periphery of the elastic porous body from above is uniformly applied to the entire contact surface between the elastic porous body and the fixing member. A plastic is preferable. If necessary, the fixing member and the elastic porous body can be fixed with an adhesive.

  The invention of claim 6 is an air diffusion system in which two or more of the air diffusers described above are attached to a pipe for sending pressurized air, and the air diffusers are arranged in contact with each other without gaps. .

  When attaching two or more of the above air diffusers to a pipe for sending pressurized air, adjusting the position of the hole for discharging pressurized air provided in the pipe, the size of the elastic porous body, etc. By making the sizes of the elastic porous bodies of the two or more air diffusers equal to each other, the two or more air diffusers can be mounted on the pipe so as to be in contact with each other without a gap.

  A plurality of elastic porous bodies can be arranged so as to have a shape that matches the shape of the aeration tank, particularly the planar shape. With this arrangement, the effective foaming area per installation area can be increased.

  In the conventional disk-type air diffuser, when connecting to a pipe, it is common to fit a screw provided on a leg to a screw provided on a pipe, so each air diffuser is rotated and attached. It was necessary and time-consuming. In the present invention, when the air diffuser is attached to the pipe for sending pressurized air as described above, it is not necessary to rotate the air diffuser itself as in the conventional disk-type air diffuser. Since the semi-cylindrical part can be attached simply by closely surrounding the pipe from the outside, the work becomes easy.

  Moreover, the preferable aspect of the aeration apparatus of this invention is as follows.

  The elastic porous body in a preferred embodiment is composed of an upper plane portion, a wall portion, and a lower plane portion, and the shape when the upper plane portion is viewed from above is a square or a rectangle, and the overall shape is a cube or a rectangular parallelepiped. Preferably there is.

  The upper plane portion forms the upper surface of the elastic porous body. The wall portion is connected to the upper plane portion at the end of the upper plane portion, that is, at the entire periphery of the upper plane portion to form a vertical wall portion. The lower flat surface portion is connected to the wall portion in an inward flange shape along the entire length of the lower end portion of the wall portion to form the lower surface of the elastic porous body. These upper plane part, wall part, and lower plane part may be integrated after being molded in separate processes, or the entire elastic porous body may be molded in one process. It is preferable that the angle between the upper plane portion and the wall portion and between the wall portion and the lower plane portion is 90 degrees, the upper plane portion and the lower plane portion are parallel, and the shape of the elastic porous body is a rectangular parallelepiped. In this case, a support part can be arrange | positioned in the box (box shape) which has the opening part which consists of an upper plane part and a wall part.

  Moreover, it is preferable that a lower plane part exists in the perpendicular direction lower direction of an upper plane part. Being vertically downward means a state in which part or all of the lower plane portion overlaps with the upper plane portion when the elastic porous body is viewed from above.

  In a preferred embodiment, a support portion that supports the elastic body is disposed in a space formed by the upper plane portion, the wall portion, and the lower plane portion of the elastic porous body.

  In order to support the shape of the support portion more effectively, when the support portion is disposed in the space formed by the upper plane portion, the wall portion, and the lower plane portion of the elastic porous body for diffusion, almost all of the space is filled. The size and shape are preferred. For example, a box-shaped object (the shape when viewed from above is a square or a rectangle) consisting of a flat part and an end part of the flat part, preferably a vertical wall connected to the upper flat part at the entire periphery is used. Is done. The lower flat portion of the porous body can be formed in a flange shape so that the lower surface of the wall portion of the support portion of the support body can be wrapped from below.

  Furthermore, in a preferred embodiment, it is preferable that a protrusion is formed on the lower flat surface portion of the porous body, and a groove that fits into the protrusion is formed on the surface of the support portion that faces the protrusion. By forming and fitting the protruding portion and the groove portion fitted thereto, the degree of adhesion between the elastic porous body and the support portion can be increased.

  The protrusion is preferably formed on the upper surface of the lower flat portion. In that case, the lower surface of the wall portion of the support portion is opposed to the upper surface of the lower flat surface portion, and the protrusion formed on the upper surface of the lower flat surface portion is fitted into the groove portion formed on the lower surface of the wall portion of the support portion. ing. The cross-sectional shapes of these protrusions and grooves are preferably U-shaped. These protrusions and grooves are preferably provided on the entire lower surface of the wall portion of the support portion, but may be only partly in some cases.

  In a preferred embodiment, it further has a fixing member that presses the elastic porous body from the periphery. This fixing member is a pressing member for pressing down the elastic porous body and preventing lateral expansion. The fixing member can press the elastic porous body from the periphery in the horizontal direction, particularly the wall portion of the elastic porous body from the outside. preferable. It is attached continuously or discontinuously around the elastic porous body. In order to obtain a uniform press, it is desirable to attach continuously.

  In a preferred embodiment, in order to fix more effectively, the fixing member includes an upper plane portion, a wall portion, and a lower plane portion, the upper plane portion presses the upper plane portion of the elastic porous body from above, and the wall portion It is preferable that the wall portion of the elastic porous body is pressed from the side, and the lower flat portion has a shape that presses the lower flat portion of the elastic porous body from below.

  The fixing member includes an upper flat portion, an end portion of the flat portion, preferably a vertical wall portion connected to the upper flat portion at the entire periphery, and a lower flat portion connected to the wall portion at the lower end periphery of the wall portion. Is preferred. Moreover, it is more preferable that the upper and lower flat portions have a circle shape with a hole in the central portion, and the cross section has a U shape. This is because, in particular, when the upper flat portion of the elastic porous body has fine ventilation holes for air diffusion, it is preferable that there is no fixed frame above it. The overall shape is preferably a box shape (the shape when viewed from above is a square or a rectangle).

  In a more preferred aspect, the support body includes a support portion, a leg portion connected to the lower center of the support portion, an upper semi-cylindrical portion connected by a screw structure below the leg portion, and a wedge in the upper semi-cylindrical portion. It consists of lower semi-cylindrical parts connected by structure. An orifice is formed in each of the center of the support portion, the center of the leg portion, and the center of the upper semi-cylindrical portion, and they communicate with an air exhaust hole provided in a pipe for sending pressurized air. .

  When attaching the diffuser to the pipe, place the diffuser on the pipe so that the orifice of the upper semi-cylindrical part fits into the hole of the pipe, the lower semi-cylindrical part placed below the pipe, and the upper half-cylinder By connecting the parts with a wedge structure, the air diffuser can be hermetically attached around the pipe.

  In the aeration operation, the elastic porous body is pressurized from below by the pressurized air sent from the pipe for sending pressurized air, and the air becomes fine bubbles when it passes through the fine communication holes. become.

  By using the air diffuser having the above structure, the effective foaming area per installation area can be increased, and the air diffuser can be easily attached to the pressurized air delivery pipe, and the air diffuser. A diffuser system using the device is now available.

  Hereinafter, the present invention will be specifically described with reference to the drawings. However, the present invention is not limited to the following examples.

  FIG. 1 is a perspective view showing an example of a fixing member of the present invention. FIG. 2 is a perspective view and a cross-sectional view showing an example of the elastic porous body of the present invention. FIG. 3 is a perspective view and a sectional view showing an example of the support of the present invention. FIG. 4 is a cross-sectional view showing an example of the air diffusing device of the present invention. FIG. 5 is a perspective view showing an example of the air diffusion system of the present invention.

  In FIG. 2, the elastic porous body 2 is composed of an upper flat part 2-1, a wall part 2-2, and a lower flat part 2-5, and has an opening by the upper flat part 2-1 and the wall part 2-2. A box is formed. At the entire periphery of the upper flat part 2-1, the wall part 2-2 is connected to the upper flat part 2-1, and the lower flat part 2-5 is at the entire length of the lower end (periphery) of the wall part 2-2. The flange is connected to the wall part 2-2. The shape of the upper plane part is a rectangle, and its thickness is 2 mm. In the upper plane portion 2-1, 16,000 fine communication holes 2-6 are formed in a spiral shape. At this time, since the area of the upper plane part 2-1 is 0.09 square meters, the number per square meter is 180,000.

  Further, a protrusion 2-3 having a U-shaped cross section is integrally formed on the upper surface of the lower flat portion 2-5 over the entire length of the lower flat portion 2-5. This elastic porous body 2 is made of EPDM and is molded by a compression molding method.

  In FIG. 3, the support 3 made of ABS resin includes a flat portion 3-1 and a wall portion 3-2, and the wall 3-2 is connected to the flat portion 3-1 at the entire periphery of the flat portion 3-1. ing. The shape of the plane portion 3-1 is a rectangle, and has an orifice 3-7 at the center thereof. A groove portion 3-3 having a U-shaped cross section is formed on the lower surface of the wall portion 3-2 over the entire length thereof. The size and shape of the support are the same as the internal space of the elastic porous body shown in FIG. 2 (the space formed by the upper flat part 2-1, the wall part 2-2, and the lower flat part 2-5). When the support body 3 is fitted in the space, the flat portion 3-1 and the wall portion are formed in a box having an opening portion made of the upper flat portion 2-1 and the wall portion 2-2. A support made of 3-2 is placed. The upper surface of the flat portion 3-1 is the lower surface of the upper flat portion 2-1, the outer surface of the wall portion 3-2 is the inner surface of the wall portion 2-2, and the lower surface of the wall portion 3-2 is the lower flat portion 2- 5 is in contact with the upper surface. Further, the protrusion 2-3 is fitted into the groove 3-3, and the elastic porous body 2 and the support 3 are brought into close contact with each other. The elastic porous body 2 encloses the support 3.

  Further, the support 3 is integrally formed with the leg 3-8 integrally formed with the flat surface 3-1 on the lower center surface of the flat surface 3-1, and integrally with the leg 3-8 below the leg 3-8. And has an upper semi-cylindrical portion 3-4. The leg 3-8 has a cylindrical shape in the vertical direction. The plane part 3-1 and the leg part 3-8 have an orifice 3-7 penetrating in the longitudinal direction at the center thereof. This orifice is for supplying pressurized air from an air discharge hole provided in a pipe (not shown) for sending pressurized air to the lower surface of the upper flat portion 2-1 of the elastic porous body 2. is there. Further, a lower semi-cylindrical portion 3-5 is disposed below the upper semi-cylindrical portion 3-4, and a pipe attachment portion composed of 3-4 and 3-5 is provided at the end of 3-4. By fitting the wedge-shaped portion provided at the end of 3-5 into the flange portion, the flange portion is integrated around the pipe for sending pressurized air. 3-6 is an O-ring.

  In FIG. 1, the fixing member 1 includes two frame portions 1-1, 1-2 and two wedge-shaped fasteners 1-3. The frame parts 1-1 and 1-2 are U-shaped members having a cross-sectional shape including an upper flat part, a wall part, and a lower flat part. In the air diffuser, after the support portion of the support 3 is fitted into the internal space of the elastic porous body 2, 1-1 and 1-2 are aligned with the orientation shown around the elastic porous body 2. Since it is not integrated as it is, the two wedge-shaped fasteners 1-3 are integrated by fitting to the flange portions formed at the ends of 1-1 and 1-2, and the fixing member is made of an elastic porous body. Fix around.

  FIG. 4 shows an air diffuser 4 having the elastic porous body 2, the support 3 and the fixing member 1 of the present invention. The air diffuser 4 can be installed on the pipe 5 for sending pressurized air as shown in FIG. The air diffuser 4 includes an upper semi-cylindrical portion 3-4 and a lower semi-cylindrical portion 3-5 to which the support 3 is detachable. , It can be easily attached to the pipe 5.

  Further, FIG. 5 shows that two or more diffusers 4 comprising the elastic porous body 2, the support 3 and the fixing member 1 shown in FIG. 4 are attached to a pipe 5 for sending pressurized air, and each diffuser. 1 shows an example of an air diffusion system that is arranged in contact with each other without a gap. In this system, since one side of the fixing member 1 of each air diffuser is arranged without contact with one side of the adjacent fixing member 1 of the air diffuser, the effective foaming area of the fine bubbles is increased. can do.

  Next, an air diffuser and the like according to an embodiment different from those shown in FIGS. 1 to 5 will be described with reference to FIGS.

The air diffusing device of the present invention will be described with reference to FIG. FIG. 6 is a longitudinal sectional view of the air diffuser 40.
As in the air diffuser 4 shown in FIG. 4, the air diffuser 40 is formed by combining the elastic porous body 2, the support 3, and the fixing member. However, the fixing member is a combination of a first fixing member (having a frame shape in a plane shape) 15 and a second fixing member (having a frame shape in FIG. 8A) 11. The support 3 has a screw portion 59 on the outer peripheral surface of the leg portion 58 in the same manner as shown in FIG.

  The elastic porous body 2 has a box shape that matches the outer shape of the support 3, and has an annular protrusion 17 in the vicinity of the end. A plastic annular plate 16 is disposed between the opposed surfaces of the annular protrusion 17 and the second fixing member 11. When pressed from above and below by the second fixing member 11, the annular protrusion 17 is crushed and brought into close contact with the annular plate 16, and the annular plate 16 and the inner lower surface of the second fixing member 11 are brought into close contact with each other, resulting in an airtight state. .

  The air diffuser 40 is similar to the air diffuser 4 shown in FIG. 4 by combining with the second support 60 as shown in FIG. 9B and the lower semi-cylindrical part 3-5 as shown in FIG. It becomes the diffuser of appearance.

  Fig.7 (a) is a top view of the diffuser 40 of FIG. FIG. 6 is a cross-sectional view taken along the line AA in FIG.

  The fixing member 1 shown in FIG. 1 uses two frame parts 1-1, 1-2 and two fasteners 1-3, and surrounds the entire circumference of the elastic porous body 2 as shown in FIG. In the fixing method shown in FIG. 7, the first fixing member 15 is fitted to the entire periphery of the elastic porous body 2, and a portion including the four corners is fixed separately instead of the entire periphery. Is.

7A, the four corners are fixed by fixing members 31 to 34, and the remaining sides are fixed by fixing members 35 to 38 as shown in FIG. 8B. The structure of the fixing members 31 to 34 is the same as that of FIG.
In FIG.7 (b), the four corners are being fixed by the fixing members 11-14. The fixing members 11 to 14 as shown in FIG. 8A are L-shaped in plan view and rectangular in front (or side) from two directions. The support 3, the elastic porous body 2, the first The fixing members 11 to 14 are fitted and fixed to the corners of the combination of the fixing member 15 and the annular plate 16.

  In FIG.7 (c), the four corners are being fixed by the fixing members 21-24. The fixing members 21 to 24 have the same structure as that of FIG. 7B, but can fix a wider range including the corners.

  The fixing members of FIGS. 7A to 7C are preferably adjusted in material and dimensions so that they can be pressed from the periphery when fitted. For example, as a material of the fixing member, a metal such as stainless steel, a rigid plastic, or the like is used. If the dimensions are set to be approximately the same, when the fixing members 31 to 34 shown in FIG. 8A are fitted into the corners of the elastic porous body 2 as shown in FIG. It is pressed and supported from the direction perpendicular to the direction.

  Next, with reference to FIG. 9, a support (a form in which a support divided into two parts is assembled) will be described. 9A is a longitudinal sectional view of one of the divided supports, FIG. 9B is a longitudinal sectional view of the other divided support, and there are two supports 3 shown in FIG. It corresponds to a structure that can be divided and assembled.

  The first support 50 has a flat surface portion 51, a wall portion 52, a groove portion 53, an orifice 57, and a leg portion 58 corresponding to the elastic porous body. A screw part 59 (a male screw or a female screw) is provided on the lower outer peripheral surface.

  The second support 60 has an upper semi-cylindrical portion 61, a semi-cylindrical flange 62, and a tubular portion 63. A screw part 65 is provided on the inner peripheral surface of the cylinder part 63, and the screw part 65 has a thread corresponding to the screw part 59.

  The support body of this embodiment is one support body by integrating the first support body 50 and the second support body 60 by screwing together. Specifically, the screw portion 59 of the first support 50 is screwed into the screw portion 65 of the second support 60. The final appearance is an air diffuser having an appearance similar to that of the air diffuser 4 shown in FIG.

Next, the air diffusing device 100 of the present invention will be described with reference to FIG. FIG. 10 is a cross-sectional view of a configuration in which the air diffuser of FIG. 9 (however, excluding the second support body 60 and the lower semi-cylindrical portion 3-5) is fixed to the holder 101. In this embodiment, it is possible to attach the diffuser to the holder using the support used for attaching the diffuser to the pipe in FIG. 6 as it is.
10 is disposed on the step 102 of the holder 101 and is fixed to the step 102 by a combination of a bolt 105, a nut 106, and a metal fitting 107. Reference numeral 103 denotes a leg, 104 denotes an air supply port, and 108 denotes an air diffusion chamber.
Next, an operation when the diffuser 100 is immersed in the aeration tank will be described. When air is sent from an air source through an air supply pipe (not shown) and discharged from the air supply port 104, the released air diffuses and fills the diffuser chamber 108 to increase the internal pressure. Due to the increase in internal pressure, the elastic porous body 2 is pressed at the orifice 3-7 of the support 3 and expands and deforms upward from a portion near the orifice 3-7 to a portion far from the orifice 3-7.
Due to the expansion and deformation of the elastic porous body 2, a gap is formed between the elastic porous body 2 and the support 3, and air is supplied through the gap, and from the small holes of the elastic porous body 2 that has expanded and expanded. It becomes a fine bubble and is discharged to the water to be treated in the aeration tank.
In such an air diffusion process, as described above, the contact surfaces of the respective members are in close contact with each other and are completely sealed, so that it is possible to prevent air from being discharged from other than the small holes and Therefore, water does not enter the diffuser chamber 108 through the small holes. For this reason, the whole amount of supplied air is discharged from the porous membrane material at the time of air diffusion.
Therefore, even when the operation and stop of the air diffuser are repeated, a stable air diffuser operation can be performed for a long time.

It is a perspective view which shows an example of the fixing member of this invention. It is the perspective view and sectional drawing which show an example of the elastic porous body of this invention. It is the perspective view and sectional drawing which show an example of the support body of this invention. It is sectional drawing which shows an example of the aeration apparatus of this invention. It is a perspective view which shows an example of the aeration system of this invention. It is sectional drawing which shows an example of the aeration apparatus of this invention. (A)-(c) is a top view of the diffuser of this invention. (A), (b) is a perspective view of the fixing member which fixes an elastic porous body. It is sectional drawing which shows an example of the supporting member of this invention. It is sectional drawing which shows an example of the aeration apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fixing member 1-1, 1-2 Frame part 1-3 of fixing member Wedge type fastener 2 of fixing member Elastic porous body 2-1 Upper plane part 2-2 of elastic porous body Wall part 2- of elastic porous body DESCRIPTION OF SYMBOLS 3 Projection part 2-5 Lower plane part 2-6 of elastic porous body 3 Fine communication hole 3 Support body 3-1 Support part plane part 3-2 Support body wall part 3-3 Groove part 3-4 Upper semi-cylindrical part 3-5 Lower semi-cylindrical portion 3-6 O-ring 3-7 Orifice 3-8 Leg 4 Aeration device 5 Pipe 10 for sending pressurized air Aeration system 11-14, 21-24, 31-38 Fixing member 50 1st support body 60 2nd support body

Claims (5)

A square elastic porous body (2), a support (3) supporting the square elastic porous body (2) from below and having an orifice for pressurized air, and a square elastic porous body (2) as a support (3) is an air diffuser comprising a fixing member (1) that is integrally fixed to
A rectangular elastic porous body (2) is formed by connecting the upper flat surface portion (2-1) and the upper flat surface portion (2-1) to the upper flat surface portion (2-1) at the entire periphery of the upper flat surface portion (2-1). 2-2), a lower flat part (2-5) connected to the wall part (2-2) in an inward flange shape, and a lower flat part ( 2-5) has a protrusion (2-3) molded integrally over the entire circumference of the lower flat part (2-5) on the upper surface, and has an opening on the lower flat part (2-5) side It is a box shape whose space shape matches the outer shape of the support,
The support (3) has a flat part (3-1) that supports the rectangular elastic porous body (2) from below, and a flat part (3-1) at the entire periphery of the flat part (3-1). The connected wall (3-2), the groove (3-3) formed on the lower surface of the wall (3-2) so as to be fitted to the protrusion (2-3), and the wall (3 -2) has an annular groove formed on the inner surface, and a mounting portion to a pipe for sending pressurized air connected to the flat surface (3-1).
The support (3) is flat in the space formed by the upper plane part (2-1), the wall part (2-2) and the lower plane part (2-5) of the square elastic porous body (2). The upper surface of the part (3-1) is on the lower surface of the upper flat part (2-1), the outer surface of the wall (3-2) is on the inner surface of the wall (2-2), and the wall (3-2) the lower surface is in contact with the upper surface of the lower plane portion (2-5), and projections (2-3) and grooves (3-3) is fitted so as to fit,
Furthermore, the tip of the lower flat surface (2-5) of the rectangular elastic porous body (2) is folded back along the annular groove formed on the inner surface of the wall (3-2) of the support (3). A diffuser.   The attachment part consists of an upper semi-cylindrical part and a lower semi-cylindrical part, and the upper semi-cylindrical part and the lower semi-cylindrical part are joined together, and the pipe for sending pressurized air at the position where the diffuser is attached is closely attached The air diffuser according to claim 1, wherein the air diffuser has a surrounding shape. It has a leg part between the attachment part and the support part,
The leg part is a cylindrical one formed integrally with the flat part of the support part, and the attachment part and the support part are integrally connected by being connected to the upper semi-cylindrical part of the attachment part. Aeration device as described.   The air diffuser according to claim 3, wherein the leg portion is connected to the upper semi-cylindrical portion by a screw structure.   A diffuser system in which two or more diffuser devices according to any one of claims 1 to 4 are attached to a pipe for sending pressurized air, and the diffuser devices are arranged in contact with each other without any gaps. .

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