JP4528219B2 - Air diffuser - Google Patents

Description

  The present invention relates to an air diffuser used in a water treatment system.

  An aeration tank of a sewage treatment system that purifies sewage and sewage using microorganisms is provided with an air diffuser including a porous member attached and an air supply holder connected to an air supply means.

As a porous member used for an air diffuser, a rubber or resin sheet provided with a large number of small holes (Patent Document 1), and fine holes obtained by sintering resin or ceramic particles into a desired shape are provided. The thing (patent document 2) is used.
JP 2003-320388 A JP-A-8-155484

  In a porous member made of resin or ceramics, dirt may be clogged in the small holes when air is not diffused. On the other hand, in the elastic porous member made of rubber, it expands by receiving pressure when it is in the diffused state. Since the small holes are closed, clogging is less likely to occur.

  Unlike the resin and ceramics, the rubber porous member needs to be supported by an appropriate support. In this case, the joint between the rubber porous member and the support is sealed and supplied. It is necessary to prevent the air to be leaked from other than the small holes.

  The present invention uses a porous membrane material made of a stretchable material such as rubber, elastomer, or plastic, and provides an air diffuser with improved sealing performance between the support member and the porous membrane material. The issue is to provide.

The invention of claim 1 is a solution to the problem.
A diffuser device in which a stretchable sheet-like porous membrane material having small holes is held in a state capable of aeration by a plurality of support members connected to an air supply means,
One of the support members is a box-shaped support member having an annular wall portion and a ceiling surface portion integrated with the annular wall portion,
The porous membrane material has a side surface portion and a flat surface portion, and has a shape that can cover the box-shaped support member,
The porous membrane material is supported by the box-shaped support member abutted from the inside, and the side end portion of the porous membrane material is sandwiched and held by the annular wall portion from above and below, A diffuser is provided.

  In the air diffuser of the invention of claim 1, since the porous membrane material is supported from the inside by the box-shaped support, the flat surface portion and the side surface portion of the porous film material are the ceiling surface portion and the annular wall of the box-shaped support body. It is in contact with the outer wall surface of the part, and no seal is required. However, if the gap between the side surface end portion and the annular wall portion of the porous membrane material is not sealed, there is a risk of air leaking.

  For this reason, in the present invention, the box-shaped support member has a structure in which the annular wall portion is divided in the height direction (upper annular wall portion and lower annular wall portion), and between the upper annular wall portion and the lower annular wall portion. By sandwiching the side surface portion of the porous membrane material and fastening it with an appropriate fastening member (for example, a combination of metal fittings, bolts, and nuts), the contact surface between the upper annular wall portion and the side edge portion of the porous membrane material, and the porous membrane The contact surface between the side surface end of the material and the lower annular wall is in close contact and sealed.

  In addition, the side surface tip portion of the porous membrane material penetrates the annular wall portion in the thickness direction and is sandwiched so as to protrude, thereby increasing the thickness of the protruding portion (for example, the cross-sectional shape in the thickness direction has an arrowhead). In this case, the sealing performance can be further improved, and the porous membrane material is prevented from falling off the annular wall portion.

  In the present invention, the planar shape of the box-shaped support member is not particularly limited, and can be a square, a rectangle, a circle, an ellipse, etc., and the shape of the porous membrane material also matches the shape of the box-shaped support member. Shape. The same applies to each of the following inventions.

The invention of claim 2 is another means for solving the problems.
A diffuser device in which a stretchable sheet-like porous membrane material having small holes is held in a state capable of aeration by a plurality of support members connected to an air supply means,
One of the support members is a box-shaped support member having an annular wall portion and a ceiling surface portion integrated with the annular wall portion,
The porous membrane material has a side surface portion and a flat surface portion, and has a shape that can cover the box-shaped support member,
An air diffuser in which the porous membrane material is supported by the box-shaped support member abutted from the inside, and a side end portion of the porous membrane material is embedded and held in the annular wall portion. provide.

  In invention of Claim 2, the groove | channel which continued in the circumferential direction was provided in the annular wall part of the box-shaped support member, and it seals by pushing the side surface edge part of a porous membrane material in the said groove | channel. In addition, the side surface tip of the porous membrane material has a cross-sectional shape in the thickness direction having an arrowhead or similar shape, and the groove has the same shape, so that the sealing performance when the side surface edge is pushed into the groove is improved. While being raised, it is also prevented that the porous membrane material falls off from the annular wall portion.

The invention of claim 3 is another solution to the problem.
A diffuser device in which a stretchable sheet-like porous membrane material having small holes is held in a state capable of aeration by a plurality of support members connected to an air supply means,
One of the support members is a box-shaped support member having an annular wall portion and a ceiling surface portion integrated with the annular wall portion,
The porous membrane material has a side surface portion and a flat surface portion, and has a shape that can cover the box-shaped support member,
The porous membrane material is supported by the box-shaped support member abutted from the inside, and the side end portion of the porous membrane material is folded and held on the lower surface of the annular wall portion. Qi device is provided.

  In the invention of claim 3, the side end portion of the porous membrane material is folded into the lower surface of the annular wall portion of the box-shaped support member, and the box-shaped support member and the porous membrane material are tightened by using fastening means such as bolts and metal fittings. By fixing, the contact surface between the side surface end portion of the porous membrane material and the annular wall portion of the box-shaped support member is brought into intimate contact and sealed.

  In another aspect of the present invention, the portion of the side surface end portion of the porous membrane material folded into the lower surface of the annular wall portion has an annular protrusion, and at least the annular wall portion of the box-shaped support member has The air diffuser according to claim 3, further comprising an annular groove corresponding to the annular protrusion, wherein the annular protrusion is fitted in the annular groove.

  Thus, by providing and fitting the annular protrusion and the annular groove, the sealing performance of the contact portion between the side surface end portion of the porous membrane material and the annular wall portion of the box-shaped support member can be further improved, and the porous membrane The material is also prevented from falling off the annular wall.

  In another aspect of the present invention, the part folded into the lower surface of the annular wall portion of the side surface end portion of the porous membrane material reaches the inner wall surface of the annular wall portion of the box-shaped support member. The air diffuser according to claim 3, wherein the air diffuser includes an annular wall portion.

  In this way, by sealing the inner wall surface of the annular wall portion by the end portion of the porous membrane material, the sealing performance of the contact portion between the side surface end portion of the porous membrane material and the annular wall portion of the box-shaped support member is further improved. While being able to raise, it is also prevented that a porous membrane material falls out of an annular wall part.

  In the air diffuser of the present invention, since the contact surface between the porous membrane material that generates bubbles and the support member that supports the porous membrane material is completely sealed, the total amount of supplied air is reduced during the air diffusion. Released from the porous membrane material.

(1) First Embodiment A description will be given with reference to FIGS. FIG. 1 is a plan view of the air diffuser of the present invention, and FIG. 2 is a cross-sectional view taken along line II-II in FIG.

  The support member used in the air diffuser 10 is a combination of a plurality of members including the box-shaped support member 20 and the pressing member 40. The support member can be made of metal or synthetic resin. The air diffuser 10 is fixed on the holder 11.

  The holder 11 has a diffuser chamber 12 in the center, and has an annular (rectangular annular) step 13 and an annular side wall 14 around it. The air diffusion chamber 12 acts to temporarily diffuse the air discharged from the air supply port 16 and accumulate the air to increase the internal pressure.

  An air supply pipe 15 whose other end is open to the atmosphere or connected to an air supply source is connected to the center of the bottom surface 12a of the air diffusion chamber 12, and the bottom surface 12a of the connection portion of the air supply pipe 15 is connected to the bottom surface 12a. An air supply port 16 is provided. Note that an air supply source (blower) can be attached to the air supply pipe 15 as necessary.

  A box-shaped support member (planar shape is rectangular) 20 is arranged on the annular step portion 13. The box-shaped support member 20 has annular wall portions 21a and 21b that can be divided in the height direction, and a ceiling surface portion 22 that is integrated with the annular wall portion 21a.

  The ceiling surface part 22 has a central port 24, and only the central port 24 can be ventilated, and the remaining part cannot be vented.

  The porous membrane material 30 is supported from the inside by the box-shaped support member 20 on the entire inner surface thereof. The porous membrane material 30 has a side surface portion 31 and a flat surface portion 32, the side surface portion 31 corresponds to the annular wall portion 21, and the flat surface portion 32 corresponds to the ceiling surface portion 22. It has a shape that can be covered. The flat surface portion 32 is provided with a large number of small holes 33 for air diffusion. However, as shown in FIG. 1, it is preferable that the small hole 33 is not provided in a portion of the porous film material 30 that is directly above the central port 24. This is because when the air supply is stopped, the portion without the small hole 33 closes the central port 24 and water can easily be prevented from entering the diffuser chamber 12.

  The porous membrane material 30 is a sheet made of a stretchable material such as EPDM (ethylene propylene rubber), silicone rubber, polyurethane, chloroprene rubber, nitrile rubber, fluorine rubber (for example, registered trademark Viton, PTFE), and perfluoroelastomer. It is a shape. Among these, EPDM is preferable in terms of strength, heat resistance, and water resistance. Further, fluororubber and perfluoroelastomer are preferable from the viewpoint of chemical resistance. Here, the term “stretchability” refers to the property of stretching without breaking when a person pulls it by hand (at least about several percent elongation).

  The thickness of the porous membrane material 30 may be uniform or non-uniform. For example, when the air diffuses, the central portion receives a larger pressure than the peripheral portion and the degree of expansion increases, so that the central portion having a large degree of expansion may be thickened and the peripheral portion may be thinned. The thickness of the porous membrane material 30 is about 1 to 4 mm at the maximum thickness portion.

  The small holes 33 may have the same diameter or different diameters. For example, at the time of air diffusion, the central part receives a greater pressure than the peripheral part and the degree of expansion also increases, so even if the hole diameter of the central part with a large degree of expansion is reduced and the hole diameter of the peripheral part is increased Good. The diameter of the small holes 33 is about 0.01 to 2 mm on average.

  The distribution state of the small holes 33 is preferably uniform, but the portion directly above the air supply port 16 is a portion that receives air pressure at the time of air diffusion and acts to promote expansion and deformation of the porous membrane material 30. Therefore, it is preferable that the small holes 33 are not present.

  The porous membrane material 30 is supported by the pressing member 40 from above at the peripheral portion on the surface side. The holding member 40 has an annular side surface portion 41 and an annular upper surface portion 42, and a portion surrounded by the annular upper surface portion 42 is opened, and the small hole 33 of the porous membrane material 30 is located in the opening. is doing.

  The end surface 31a of the side surface portion 31 of the porous membrane material is sandwiched from above and below by the annular wall portion 21a and the annular wall portion 21b, and the arrowhead-shaped tip portion 31b penetrates the annular wall portion 21a and the annular wall portion 21b. Is projected into the diffuser chamber 12.

  The pressing member 40, the porous membrane material 30, and the box-shaped support member 20 are fixed to the step portion 13 of the holder 11 by a combination of bolts 51 and 52 and a metal fitting 53 (tightening fixing means).

  By the action of the fastening and fixing means, the contact surface between the pressing member 40 and the porous membrane material 30, the contact surface between the annular wall portion 21a and the porous membrane material 30, the contact surface between the porous membrane material 30 and the annular wall portion 21b, and the annular wall portion 21b. Since the contact surfaces of the step portion 13 and the step portion 13 are in close contact with each other, they have sufficient sealing properties.

  Next, the operation when the diffuser 10 is immersed in the aeration tank will be described. When air is not supplied, the small holes 33 of the porous membrane material 30 are closed from below by the ceiling surface portion 22 of the box-shaped support member 20, so that water does not enter the diffuser 10. .

  When air is sent from the air source through the air supply pipe 15 and discharged from the air supply port 16, the released air diffuses and fills in the diffuser chamber 12 and increases the internal pressure. Due to the increase in internal pressure, the porous membrane material 30 is pressed at the central port 24 of the box support member 20 and expands and deforms upward.

  Due to the expansion and deformation of the porous membrane material 30, a gap is generated between the flat surface portion 32 and the ceiling surface portion 22, and the porous membrane material 30 is further inflated and deformed by air entering the gap, and air is passed through the small holes 33. Is released into the water to be treated in the aeration tank.

  The porous membrane material 30 receives the pressure at the time of air diffusion, and the central portion has a degree of expansion larger than that of the peripheral portion, but the thickness of the porous membrane material 30 and the distribution and diameter of the small holes 32 at the central portion and the peripheral portion. Is adjusted, the amount of air released over the entire surface of the porous membrane material 30 can be made uniform.

  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 air is prevented from being discharged from other than the small holes 33, and the air diffusion chamber 12. Since the internal pressure is increased, water does not enter the diffuser chamber 12 through the small holes 33. For this reason, the whole amount of supplied air is discharged from the porous membrane material at the time of air diffusion.

  In addition, since the arrowhead-shaped tip 31b serves as a stopper, the end face 31a does not fall out of the annular walls 21a and 21b even when the pressure in the diffuser chamber 12 is increased (that is, the porous membrane material 30). , Has a fall-off prevention function). For this reason, a stable aeration operation can be performed for a long time.

(2) Second Embodiment A description will be given with reference to FIGS. 1, 3A, and 3B. FIG. 3A is a cross-sectional view taken along the line II-II in FIG. 1, and shows a mode that is different from FIG. 2 only in the seal structure. FIG. 3B is a partially enlarged view of FIG. In FIG. 3, the same reference numerals as those in FIG. 2 indicate the same parts.

  The side surface portion 31 of the porous membrane material 30 is embedded in a groove 35 provided continuously in the circumferential direction in the annular wall portion 21 (which cannot be divided in the height direction). As shown in the drawing, the side surface portion 31 has a rod-shaped portion 31a and an arrowhead-shaped portion 31b when shown in a sectional shape in the thickness direction. On the other hand, the groove 35 has a cylindrical space 36 and an arrowhead-shaped space 37 in a cross-sectional shape in the thickness direction.

  Since the porous membrane material 30 is made of rubber or the like, when the side surface portion 31 is pushed into the cylindrical space 36 of the groove portion 35, the arrowhead-like portion 31b is pressed and deformed. When 31b reaches the arrowhead-shaped space 37, the arrowhead-shaped portion 31b that has been pressed and deformed is restored to its original shape and fits exactly into the arrowhead-shaped space 37. For this reason, the space between the side surface portion 31 of the porous membrane material 30 and the annular wall portion 21 of the box-shaped support member 20 is completely sealed, and the arrowhead-shaped portion 31b serves as a stopper member. Is done.

  The air diffuser of the second embodiment operates in the same manner as the air diffuser of the first embodiment, and the same operational effects are obtained.

(3) Third Embodiment A third embodiment will be described with reference to FIGS. FIG. 4 is a cross-sectional view taken along the line II-II in FIG. 1, and shows a mode that is different from FIG. 2 only in the seal structure. In FIG. 4, the same reference numerals as those in FIG. 2 indicate the same parts.

  The side surface portion 31 of the porous membrane material 30 is folded into the lower surface of the annular wall portion 21 (which cannot be divided in the height direction), and the distal end portion 31 b is located in the diffuser chamber 12. The tip 31b may be fixed to the holder 11 with an adhesive or the like.

  An annular (rectangular annular) projection 31a in the vertical direction is provided on the end face of the porous membrane material 30, and an annular groove corresponding to the annular projection 31a is formed on the lower surface of the annular support frame 20 and the surface of the step portion 13. Each is provided, and an annular protrusion 31a is fitted into two upper and lower annular grooves.

  The protrusion 31a may be integral with the porous membrane material 30 or may be a separate member (for example, an O-ring). However, the protrusion 31a is a porous film in terms of reducing the number of parts of the entire air diffuser and sealing properties. A material integrated with the material 30 is preferable. Further, the cross-sectional shape is not particularly limited as long as it is a shape that is crushed by a predetermined pressure, and may be a triangular shape, a quadrangular shape, a semicircular shape, or the like.

  The air diffuser of the third embodiment operates in the same manner as the air diffuser of the first embodiment, and the same operational effects are obtained.

(4) Fourth Embodiment A fourth embodiment will be described with reference to FIGS. FIG. 5 is a partial cross-sectional view taken along the line II-II in FIG. 1, and shows a mode that is different from FIG. 2 only in the seal structure. FIG. 6 is a partially enlarged view of FIG. 5 and 6, the same reference numerals as those in FIG. 2 indicate the same components.

  The side surface portion 31 of the porous membrane material 30 is folded into the lower surface of the annular wall portion 21 (which cannot be divided in the height direction).

  The end face of the porous membrane material 30 is provided with a downward annular (rectangular annular) protrusion 31a, and when tightened from above and below by the fastening and fixing means, the annular protrusion 31a is crushed so that the surface of the step 13 (Acts the same as the O-ring). And the front-end | tip part 31b reaches to the level | step-difference part 21a provided in the annular wall part 21, and has embraced the annular wall part 21 from the inner side. The contact surface between the tip portion 31b and the step portion 21a may be fixed with an adhesive or the like.

  The air diffuser of the fourth embodiment operates in the same manner as the air diffuser of the first embodiment, and the same operational effects are obtained.

The top view of a diffuser. Sectional drawing of the II-II line | wire of FIG. Sectional drawing of the form different from FIG. Sectional drawing of the form different from FIG. The fragmentary sectional view of the form different from FIG. The elements on larger scale of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Air diffuser 11 Holder 15 Air supply pipe 16 Air supply port 20 Box-shaped support member 30 Porous membrane material 40 Holding member

Claims (4)

An air diffuser (10) in which an elastic sheet-like porous membrane material (30) having small holes (33) is held in a state in which air can be diffused by a plurality of support members connected to an air supply means. And
One of the support members is a box-shaped support member (20) having an annular wall portion (21a, 21b) and a ceiling surface portion (22) integrated with the annular wall portion (21a, 21b),
The porous membrane material (30) has a side surface portion (31) and a flat surface portion (32), and has a shape capable of covering the box-shaped support member (20),
The porous membrane material (30) has the ceiling surface portion (22) of the box-shaped support member (20) brought into contact with the flat surface portion (32) from the inside, and the annular wall portions (21a, 21b) of the box-shaped support member (20). ) Is in contact with and supported by the side (31) from the inside,
In the state where the end face (31a) of the side face part (31) of the porous membrane material (30) is bent and the arrowhead-like tip part (31b) penetrates the annular wall part (21a) and the annular wall part (21b), An air diffuser that is sandwiched and held by an annular wall (21a, 21b) from above and below. An air diffuser (10) in which an elastic sheet-like porous membrane material (30) having small holes (33) is held in a state in which air can be diffused by a plurality of support members connected to an air supply means. And
One of the support members is a box-shaped support member (20) having an annular wall portion (21) and a ceiling surface portion (22) integrated with the annular wall portion (21),
The porous membrane material (30) has a side surface portion (31) and a flat surface portion (32), and has a shape capable of covering the box-shaped support member (20),
In the porous membrane material (30), the ceiling surface portion (22) of the box-shaped support member (20) is brought into contact with the flat surface portion (32) from the inside, and the annular wall portion (21) of the box-shaped support member (20) is It is in contact with and supported by the side part (31) from the inside,
The end surface (31a) of the side surface portion (31) of the porous membrane material (30) is bent, and the end surface (31a) and the arrowhead-shaped tip portion (31b) are continuously connected to the annular wall portion (21) in the circumferential direction. An air diffuser embedded and held in a groove (36, 37) provided. An air diffuser (10) in which an elastic sheet-like porous membrane material (30) having small holes (33) is held in a state in which air can be diffused by a plurality of support members connected to an air supply means. And
The air diffuser (10) is fixed on the holder (11),
One of the support members is disposed on the annular step portion (13) of the holder (11), and the ceiling wall portion (22) integrated with the annular wall portion (21) and the annular wall portion (21). A box-shaped support member (20) having
The porous membrane material (30) has a side surface portion (31) and a flat surface portion (32), and has a shape capable of covering the box-shaped support member (20),
In the porous membrane material (30), the ceiling surface portion (22) of the box-shaped support member (20) is brought into contact with the flat surface portion (32) from the inside, and the annular wall portion (21) of the box-shaped support member (20) is It is in contact with and supported by the side part (31) from the inside,
Furthermore, the end surface of the side surface part (31) of the porous membrane material (30) is folded between the lower surface of the annular wall part (21) and the annular step part (13), and the tip part (31b) is an adhesive. Is secured to the holder (11) by
An annular protrusion (31a) in the vertical direction is provided on the end surface of the side surface portion (31) ,
The lower surface and the surface of the annular step portion (13) of the annular wall portion (21) is an annular groove corresponding to the annular projection in the vertical direction (31a) is vignetting set,
An air diffuser in which an annular protrusion (31a) in the vertical direction is fitted into two upper and lower annular grooves. An air diffuser (10) in which an elastic sheet-like porous membrane material (30) having small holes (33) is held in a state in which air can be diffused by a plurality of support members connected to an air supply means. And
One of the support members is a box-shaped support having an annular wall portion (21) and a ceiling surface portion (22) integrated with the annular wall portion (21) disposed on an annular step portion (13). Member (20),
The porous membrane material (30) has a side surface portion (31) and a flat surface portion (32), and has a shape capable of covering the box-shaped support member (20),
In the porous membrane material (30), the ceiling surface portion (22) of the box-shaped support member (20) is brought into contact with the flat surface portion (32) from the inside, and the annular wall portion (21) of the box-shaped support member (20) is It is in contact with and supported by the side part (31) from the inside,
Furthermore, the end surface of the side surface portion (31) of the porous membrane material (30) is folded and held on the lower surface of the annular wall portion (21),
The end surface is provided with a downward annular protrusion (31a), and the annular protrusion (31a) is in close contact with the surface of the annular step portion (13) by being crushed, and the side surface portion ( 31) The aerating device in which the tip (31b) of the 31) holds the annular wall (21) from the inside.

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