JP2006075771A - Elastic porous body for air diffusion, and air diffusion device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air diffusion plate easy to be fitted to an air diffusion plate holder and an air diffusion device in which an air chamber has high airtightness. <P>SOLUTION: The subject packing integrated type elastic porous body for air diffusion is composed of an upper plane part, a wall part provided at the edge part of the upper plane part and a lower plane part provided at the lower edge part of the wall part. Packing and a projecting part are integrally formed at the lower plane part, and if required, a support and a fixing member are incorporated therein. An air diffusion device is obtained by fixing the same to the air diffusion plate holder. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an elastic porous body for an air diffuser installed in an aeration tank used in an organic wastewater treatment system centering on sewage treatment, in particular, an air diffuser plate type membrane diffuser, and an air diffuser 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 polymer porous body, an ultrafine bubble type membrane diffuser has come to be used due to its high performance.
JP 2003-001290 A JP 2003-024974 A

  However, with the membrane diffusers proposed so far, it has not been possible to obtain an air diffuser that is easy to attach to the diffuser plate holder and has a high degree of sealing of the air chamber in the air diffuser.

  An object of the present invention is to provide an elastic porous body (aeration plate) and an air diffusion device that can solve the above-described problems, are easily attached to an air diffusion plate holder, and have high confidentiality of an air chamber in the air diffusion device. It is.

  The invention of claim 1 consists of an upper plane part, a wall part provided at the upper plane part end part, and a lower plane part provided at the lower end part of the wall part, and a packing is integrally formed on the lower plane part. It is a packing-integrated elastic porous body for air diffusion, and the invention according to claim 2 is the elastic porous body for air diffusion in which the lower flat portion is provided vertically below the upper flat portion. Moreover, the protrusion part may be integrally formed in the lower plane part. These protrusions are preferably provided over the entire circumference of one surface of the lower flat part, but may be only a part depending on the case.

  The elastic porous body of the present invention comprises an upper flat portion, a wall portion, and a lower flat portion, and is obtained by molding an elastic material. The shape is not limited, but considering the case where the existing diffuser holder is used as it is, the shape when the upper flat portion is viewed from above is a square or a rectangle, and the overall shape is a cube or a rectangular parallelepiped It is preferable.

  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 plane portion is connected to the wall portion to form the lower surface of the elastic porous body over the entire length of the lower end portion of the wall portion. 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.

  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.

  Furthermore, packing is integrally formed in the lower plane part. This packing is for preventing air from leaking between the holder and the elastic porous body when the elastic porous body is attached to the diffuser plate holder, and is used as a separate part in the conventional diffuser. In the present invention, what has been formed is integrated with the elastic porous body. The packing is provided on the surface where the lower flat portion is in contact with the diffuser plate holder, usually on the lower surface of the lower flat portion. The packing also has a positioning function when the elastic porous body is attached to the diffuser plate holder. It is also possible to fix the elastic porous body to the diffuser plate holder with an adhesive or the like without using this packing.

  The elastic porous body of the present invention is obtained by molding a material having elasticity into a desired shape, and the material of the porous body is, for example, ethylene propylene rubber (EPDM), silicon rubber, viton, polyurethane, chloroprene rubber. You can choose from rubbers such as nitrile rubber. Among these, ethylene propylene rubber is particularly preferable because it has high film strength and excellent heat resistance and water resistance.

  The invention according to claim 5 is the above packing-integrated type, wherein the upper flat portion has a thickness of 0.1 to 3.0 mm and has 10,000 to 1,000,000 fine ventilation holes per square meter. This is an elastic porous material. These communication holes are fine ventilation holes penetrating the upper plane part, and are holes for discharging fine bubbles to be diffused. The thickness of the upper plane part 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 drop, and foamed bubbles will collide with each other and become large, so it is not preferable. If it is less than this range, the number of bubbles will decrease and the original purpose will be reduced. Is not desirable because

  The invention according to claim 6 is a support in which a support for supporting the elastic body is disposed in a space formed by the upper plane portion, the wall portion, and the lower plane portion of the diffused elastic porous body. This is an elastic porous body with diffused packing integrated type.

  When the aeration operation is not performed, that is, when the elastic porous body is not pressurized with compressed air from below, it is preferable that the upper flat portion of the elastic porous body has a sufficient thickness. In the case where the thickness is not large, it is preferable to have the support as described above from the viewpoint of strength maintenance and shape maintenance.

  Although the shape of the support is not limited, in order to support it more effectively, when it is placed in the space formed by the upper flat part, the wall part, and the lower flat part of the diffused elastic porous body It is preferable that the size and shape satisfy almost all of the space. 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 flat surface portion may be processed so as to have a + character, an X character, a well shape, or the like. That is, particularly when the upper flat portion of the elastic porous body has fine ventilation holes, it is desirable that the flat portion of the support has a plurality of holes for efficient ventilation. A larger hole is preferable because air permeability is improved. As described above, the shape of the flat portion other than the hole is preferably a + character, an X character, a well shape, or the like.

  In particular, considering the case where the conventional diffuser plate holder is used as it is (replaced), it is preferable that both the elastic porous body and the support are rectangular parallelepiped.

  Furthermore, the invention of claim 8 is provided with the above-mentioned support body, wherein a projection is formed on the lower flat surface portion, and a groove portion that fits the projection is formed on the surface of the support that faces the projection. It is a packing-integrated elastic porous body for air diffusion. By forming and fitting the protruding portion and the groove portion fitted therein, the degree of adhesion between the elastic porous body and the support 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 body 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 in the groove portion formed on the lower surface of the wall portion of the support body. 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, but may be only a part in some cases.

  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 invention of claim 11 is the above-mentioned packing-integrated elastic porous body with packing, further comprising a fixing member that presses the packing-integrated elastic porous body from above. This fixing member is a holding member for holding down the elastic porous body and preventing it from spreading in the lateral direction. When the elastic porous body has a rectangular parallelepiped shape, the upper flat portion and the wall portion are formed from above. It is preferable to press the connected portion from above. It is attached continuously or discontinuously around the elastic porous body. In order to obtain a uniform press, continuous is desirable.

  Although the shape of the fixing member is not limited, in order to support it more effectively, it is composed of a horizontal part and a wall part, the horizontal part presses the upper flat part of the elastic porous body from above, and the wall part is It is preferable that the shape is such that the wall portion of the elastic porous body is pressed from the side surface. The fixing member is preferably composed of a flat portion and an end portion of the flat portion, preferably a vertical wall portion connected to the upper flat portion at the entire periphery. Further, it is more preferable that the flat portion has an O-shape with a hole in the center, and the cross-section has an inverted L-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).

  The fixing member is preferably made of a rigid material so that the force for pressing the outer peripheral portion of the elastic porous body from above is uniformly applied to the entire contact surface between the elastic porous body and the fixing member. Specific examples of the material include one or more selected from steel plates, stainless steel plates, engineering plastics such as polysulfone and FRP. If necessary, the fixing member and the elastic porous body can be fixed with an adhesive.

  A fourteenth aspect of the present invention is an air diffusion apparatus in which the packing-integrated elastic porous body for gas diffusion is fixed to an air diffusion plate holder. The above-described packing-integrated elastic porous body, packing-integrated elastic porous body with support, packing-integrated elastic porous body including a fixing member, or packing-integrated elastic porous body with a support including a fixing member By fixing to the holder, it becomes a diffuser and can be used in the aeration tank. In order to fix the elastic porous body to the diffuser plate holder, for example, as disclosed in Patent Document 1, an inverted L-shaped mounting bracket (holding metal) is overlaid on the fixing member or the elastic porous body. Place it on the diffuser plate holder and fix it with the mounting bolts and mounting nuts using the bolt hole of the diffuser plate holder and presser fitting.

  In the diffuser operation, the elastic porous body is pressurized from below by the pressurized air sent from the pipe connected to the lower part of the diffuser plate holder, and the air becomes fine bubbles when passing through the fine communication holes. I will be worried.

  As described above, since the elastic porous body composed of the upper plane portion, the wall portion, and the lower plane portion having the packing is used, it is easy to attach to the lower horizontal portion diffuser plate holder, and the air chamber in the diffuser Highly confidential diffusers and diffusers can be obtained.

  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 cross-sectional view showing an example of a conventional air diffuser.

  In FIG. 2, the elastic porous body 2 is composed of an upper plane part 2-1, a wall part 2-2, and a lower plane part 2-5, and the wall part 2-2 is formed on the entire periphery of the upper plane part 2-1. It connects with the upper plane part 2-1, and the lower plane part 2-5 is connected with the wall part 2-2 in the full length of the lower end part of 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 portion 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 extends over the entire length of the lower flat portion 2-5 on the upper surface of the lower flat portion 2-5, and a packing 2-4 is provided on the lower surface of the lower flat portion 2-5. It is integrally molded 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. Since the shape of the plane portion 3-1 is a rectangle and has four triangular holes, the shape of the plane portion 3-1 other than the holes is an X-shape. 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 3 is fitted into the space, the upper surface of the flat surface portion 3-1 is the lower surface of the upper flat surface portion 2-1, and the outer surface of the wall portion 3-2 is the wall portion 2-2. Also, the lower surface of the wall 3-2 is in contact with the inner surface and the upper surface of the lower flat portion 2-5. 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.

  In FIG. 1, the fixing member 1 includes a flat portion 1-1 and a wall portion 1-2, and the wall portion 1-2 is connected to the flat portion 1-1 at the entire periphery of the flat portion 1-1. The shape of the plane portion 1-1 is a rectangle, and since the large rectangular hole is formed at the center, the shape of the plane portion is an O-shape, and its cross-sectional shape is an inverted L-shape. The material of this support is stainless steel. Since the size and shape of the internal space of the fixing member 1 are the same as the size and shape of the elastic porous body 2, when the fixing member 1 is placed on the elastic porous body 2, the upper horizontal portion 2-1 Since the upper surface of this is in contact with the lower surface of the flat portion 1-1 and the outer surface of the wall portion 2-2 is in contact with the inner surface of the wall portion 1-2, the fixing member 1 and the elastic porous body 2 are in close contact with each other.

  FIG. 4 shows a state in which the elastic porous body 2, the support 3 and the fixing member 1 of the present invention are installed on the diffuser plate holder 4-1 to form an air diffuser. The elastic porous body 2, the support body 3, and the fixing member 1 that are integrally adhered as described above are placed on the diffuser plate holder 4-1, and further, an inverted L-shaped presser fitting 4-2 (the material is made of). (Stainless steel) is arranged over the entire circumference of the fixing member 1. By attaching the mounting bolt 4-3 and the mounting nut 4-4 to the bolt holes provided in the diffuser plate holder 4-1 and the inverted L-shaped presser fitting 4-2, the elastic porous body 2 and the support body 3 The fixing member 1 is fixed to the diffuser plate holder 4-1 (see Patent Document 1). At this time, the packing 2-4 is between the lower surface of the lower flat portion 2-5 and the upper surface of the diffuser plate holder 4-1, and the packing is integrally formed with the elastic porous body 2 in advance. As shown in FIG. 5, compared with the case where the packing 5-5 is used as a separate member from the diffuser plate 5-6, the air diffuser plate and the diffuser device with high confidentiality of the air chamber in the diffuser device Become.

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 sectional drawing which shows an example of the conventional diffuser.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fixing member 1-1 Flat part 1-2 of fixing member Wall part 2 of fixing member Elastic porous body 2-1 Upper flat part 2-2 of elastic porous body Wall part 2-3 of elastic porous body Protrusion part 2-4 Packing 2-5 Lower flat surface portion 2-6 of elastic porous body Fine communication hole 3 Support body 3-1 Support flat surface portion 3-2 Support body wall portion 3-3 Groove portion 4-1 Diffusing plate holder 4- 2 Reverse L-shaped presser bracket 4-3 Mounting bolt 4-4 Mounting nut 5-1 Air diffuser plate holder 5-2 Reverse L-shaped presser bracket 5-3 Mounting bolt 5-4 Mounting nut 5-5 Packing 5-6 Diffuser

Claims (14)

Packing-integrated air diffuser consisting of an upper flat part, a wall part provided at the upper flat part end part, and a lower flat part provided at the lower end part of the wall part, and a packing is integrally formed on the lower flat part. Elastic porous body. The elastic porous body for aeration according to claim 1, wherein the lower plane portion is provided vertically below the upper plane portion. The elastic porous body for aeration according to claim 1 or 2, wherein a protrusion is further formed integrally with the lower plane portion. The packing-integrated diffuser according to any one of claims 1 to 3, wherein the porous material is one or more selected from ethylene propylene rubber (EPDM), silicon rubber, viton, polyurethane, chloroprene rubber, and nitrile rubber. Elastic porous material. 5. The packing-integrated type according to claim 1, wherein the upper flat portion has a thickness of 0.1 to 3.0 mm and has 10,000 to 1 million fine ventilation holes per square meter. Elastic porous body for air diffusion. The support body which supports the elastic body is arrange | positioned in the space formed of the upper plane part of the diffused elastic porous body in any one of Claims 1-5, a wall part, and a lower plane part. Packing-integrated elastic porous body for air diffuser. The elastic porous body for aeration with an integrated packing with a support according to claim 6, wherein the elastic porous body and the support have a rectangular parallelepiped shape. The support according to any one of claims 6 and 7, further comprising a protrusion formed on the lower flat surface, and a groove that fits into the protrusion formed on the surface of the support that faces the protrusion. Packing-integrated elastic porous body for air diffuser. The elastic porous body for aeration with an integrated packing according to claim 8, wherein the shape of the protrusion and the groove is U-shaped. The packing-integrated packing-type elastic porous body with a support according to any one of claims 7 to 9, wherein the support is made of one or more materials selected from steel plates, stainless steel plates, FRP, engineering plastics, and plastics. . The packing-integrated elastic porous body according to any one of claims 1 to 10, further comprising a fixing member that presses the packing-integrated elastic porous body from above. 12. The packing-integrated gas diffusion elasticity according to claim 11, wherein the fixed frame has an inverted L-shaped cross section and is attached continuously or discontinuously around the packing-integrated gas diffusion elastic porous body. Porous body. The packing-integrated elastic porous body according to claim 11 or 12, wherein the material of the fixed frame is one or more selected from steel plates, stainless steel plates, polysulfone, and engineering plastics. An air diffuser in which the packing-integrated elastic porous body for air diffuser according to claim 1 is fixed to an air diffuser plate holder.

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