JP2014079728A - Gas dispersing elastic material, and gas disperser having gas dispersing elastic material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas dispersing elastic material capable of restraining a deviation in supplying bubbles into liquid.SOLUTION: A gas dispersing elastic material comprises: a plate-like elastic film used in the liquid for supplying the bubbles in the liquid and forming a plurality of gaps of penetrating in the thickness direction, and is constituted so as to supply the bubbles in the liquid by discharging gas via the gaps into the liquid existing on the other surface side of the elastic film, by expanding the gaps by overhanging to the other surface side, by elastically deforming the elastic film by pressure of the gas supplied from one surface side of the elastic film when dispersing the gas. The gas dispersing elastic material further comprises: a rib being a plurality of bar-shaped elastic members, and is provided so that the rib is arranged on at least one surface side of the elastic film, and is arranged in a radial shape by extending along an elastic film surface to the outer peripheral side from a central part of the elastic film.

Description

  The present invention relates to a diffused elastic material and a diffused gas including the diffused elastic material.

  Conventionally, various elastic materials have been known as diffusers. For example, a plate that is used in a liquid to supply bubbles into the liquid and has a plurality of cuts that penetrate in the thickness direction. What is provided with the elastic film of the shape is known.

  In this type of elastic material for air diffusion, the elastic film is elastically deformed by the pressure of the gas supplied from one side of the elastic film during the air diffusion, and the cut is spread by projecting to the other surface side. The gas thus passed is discharged into the liquid on the other surface side of the elastic membrane, and bubbles are supplied into the liquid.

  As this type of diffuser elastic material, specifically, for example, an elastic material having only a rectangular plate-like elastic film with a large number of cuts has been proposed (Patent Document 1).

  Such an elastic material for air diffusion is in a state in which the center side is stretched more than the outer peripheral side and the cut at the center side is more likely to expand in a state where the elastic film protrudes when air is diffused as described above. That is, not all portions of the elastic film are necessarily stretched uniformly by the same force, and the stretch rate of the elastic film is different in each portion, so that the spread of the cuts can be different. Accordingly, there is a problem in that the breaks spread to various sizes, and bubbles are not necessarily supplied into the liquid in the same manner from the breaks in the entire elastic film, and the supply of bubbles may be biased. If there is a bias in the supply of bubbles, the efficiency of supplying bubbles of the intended size deteriorates.

JP 2005-329329 A

  In view of the above-described problems, the present invention provides an elastic material for air diffusion that can suppress the uneven supply of bubbles into the liquid, and an air diffused gas that can suppress the uneven supply of bubbles into the liquid. Is an issue.

In order to solve the above-mentioned problems, the elastic material for air diffusion according to the present invention is used in a liquid to supply bubbles into the liquid, and has a plate-like elasticity with a plurality of cuts penetrating in the thickness direction. The elastic membrane is elastically deformed by the pressure of the gas supplied from one side of the elastic membrane at the time of air diffusion and extends to the other surface side. An elastic material for air diffusion configured to discharge into the liquid on the other surface side and supply bubbles into the liquid,
A rib as a plurality of rod-like elastic members is further provided, and the ribs are arranged on at least one side of the elastic membrane, and are arranged radially by extending along the elastic membrane surface from the central portion of the elastic membrane to the outer peripheral side. It is characterized by being.

In the elastic material for air diffusion having the above-described configuration, when the elastic film protrudes to the liquid side due to elastic deformation at the time of air diffusion, the central side of the elastic film is extended from the outer peripheral side, and the cut is more likely to expand on the central side. Can be in a state. However, the ribs are arranged on at least one side of the elastic membrane, and the ribs as a plurality of rod-like elastic members are arranged radially from the central portion of the elastic membrane to the outer peripheral side along the elastic membrane surface. The interval between the adjacent rod-like elastic members becomes narrower as it approaches the central portion of the elastic film. Therefore, as the distance between the rod-like elastic members is closer to the central portion of the elastic film, the elastic force of the ribs is greatly increased on the central side, and the suppression force of the elastic film is increased toward the central side. Thereby, it can suppress that the center side of an elastic film extends more than an outer peripheral side at the time of aeration, and can suppress that a cut | interruption becomes easy to expand in the center side of an elastic film.
As described above, according to the elastic material for aeration, it is possible to suppress the excessive supply of bubbles from the center side, and it is possible to suppress the uneven supply of bubbles into the liquid.

  The diffused gas of the present invention is characterized by comprising the elastic material for aeration.

  As described above, the elastic material for gas diffusion and the gas diffused gas of the present invention have an effect of suppressing the uneven supply of bubbles into the liquid.

(A) The schematic of the elastic material for aeration seen from the gas discharge | release side. (B) The schematic diagram of the elastic material for aeration seen from the gas supply side. The schematic diagram of the elastic material for aeration seen from the gas discharge side. The schematic diagram of the elastic material for aeration seen from the gas discharge side. (A) The top view showing a mode that the elastic material for aeration is used. (B) Sectional drawing which represented typically a mode that the elastic material for aeration was used in the ZZ cross section of (a). The graph showing the average oxygen transfer efficiency when it diffuses using the elastic material for aeration.

Hereinafter, an embodiment of an elastic material for air diffusion according to the present invention will be described with reference to the drawings.
1 to 3 are schematic views when the elastic material for aeration of the present embodiment is viewed from one side, and FIG. 4 shows a state in which a diffused gas provided with the elastic material for aeration is used. FIG.

The diffuser elastic material 1 of the present embodiment includes a plate-like elastic film 2 that is used in a liquid to supply bubbles in the liquid and has a plurality of cuts A that penetrate in the thickness direction. The elastic film 2 is elastically deformed by the pressure of the gas supplied from one surface side of the elastic film 2 at the time of air diffusion, and the cut A is expanded by projecting to the other surface side, and the gas passing through the cut A is expanded into the elastic film 2. An elastic material 1 for diffuser configured to discharge into the liquid on the other surface side of the gas and supply bubbles into the liquid,
A rib 3 as a plurality of rod-like elastic members is further provided, and the rib 3 is disposed on at least one side of the elastic film 2 and extends along the elastic film surface from the central portion 2a of the elastic film 2 to the outer peripheral side. They are arranged radially.

  The elastic material 1 for aeration is used in a liquid for supplying bubbles into the liquid, and normally, as shown in FIG. 4B, the thickness direction of the elastic film 2 is the vertical direction. It is arranged to be used in a liquid.

In the elastic material 1 for air diffusion, for example, as shown in FIG. 4B, ribs 3 are arranged on the upper side of the elastic film 2.
For example, as shown in FIG. 4 (a), the peripheral portion of the elastic membrane 2 is fixed by a resin fixing device 5 or the like, as shown in FIG. 4 (b). The elastic film 2 and the rib 3 are elastically deformed by the pressure of the gas supplied from the lower side of the elastic film 2, and the elastic film 2 protrudes upward. Further, many cuts A penetrating in the thickness direction of the elastic film 2 are formed in the elastic film 2, and the cuts A are expanded by the elastic film 2 projecting upward as described above, and the supplied gas is expanded. It is configured to be discharged as bubbles in the liquid via A.

The shape of the elastic membrane 2 is not particularly limited as long as it is a plate shape, but the shape is preferably a symmetrical shape when viewed from one side of the elastic membrane 2.
The symmetrical shape is preferably a rotationally symmetric shape that overlaps the original shape when rotated by a specific angle, and more preferably a point-symmetric shape. Further, as the symmetric shape, a line symmetric (mirror image symmetric) shape may be employed.

  The shape of the elastic film 2 is shown in FIGS. 1 to 3 in that the uneven elongation of the elastic film 2 can be further suppressed, and the uneven supply of bubbles and the uneven size of the bubbles can be further suppressed. Thus, it is more preferable that it is disk shape or rectangular plate shape, and it is still more preferable that it is disk shape as shown in FIG.

  The thickness of the elastic membrane 2 is not particularly limited, but is usually 0.5 mm to 2.5 mm. The elastic film 2 is usually formed to have the same thickness from the central portion 2a (the center of gravity assuming that the elastic film is homogeneous) to the outer peripheral edge.

  The size of the elastic membrane 2 is not particularly limited, but when the shape is a disc shape, it is usually a size having a diameter of 20 cm to 40 cm, and when the shape is a rectangular plate shape, Usually, it is a size having a diagonal length of 20 cm to 40 cm.

  The material constituting the elastic film 2 is not particularly limited as long as it is an elastically deformable material. Examples of the material include ethylene propylene diene rubber, silicone rubber, fluorine rubber, styrene rubber, chloroprene rubber, nitrile rubber, natural rubber, and the like. Examples thereof include polymer compounds such as rubber, polyurethane, and thermoplastic elastomer.

  The cut A penetrates the elastic film 2 in the thickness direction so as to allow gas to pass from one surface side of the elastic film 2 to the other surface side when air is diffused.

The extending direction of the cut A is not particularly limited.
The cut A is in a direction perpendicular to the direction from the central portion 2a of the elastic film 2 toward the outer peripheral side, that is, the direction in which the elastic film 2 extends, in that the cut is easily opened when the elastic film 2 is stretched. It is preferable that it is inserted so as to extend in a direction perpendicular to the direction, and as shown in FIGS. 1 and 2, it extends in a direction perpendicular to the radial direction of the disc-shaped elastic film 2. More preferably, it is contained.
The cut A may be linear or curved.
A large number of the cuts A are usually made over the entire portion where the elastic film 2 supplies bubbles into the liquid.

  The length of each cut A is not particularly limited, and examples of the length include 0.3 mm to 1.0 mm.

  The average length of the cut A is preferably 0.6 mm or more in that the ability to supply a gas into the liquid is more excellent, and the strength of the elastic film 2 can be more reliably maintained. It is preferable that it is 1.0 mm or less at the point which can be performed.

  The cut A preferably extends in a direction perpendicular to the radial direction from the central portion 2a of the elastic film 2, and the cuts A adjacent to each other are along the direction in which the cut A extends. It is preferable that they are arranged with an interval of 1 mm to 4 mm. That is, the interval between the cuts A is preferably 1 mm to 4 mm in the direction in which the cuts A extend.

  The cut A preferably extends in a direction perpendicular to the radial direction from the central portion 2a of the elastic film 2, and the cuts A adjacent to each other are perpendicular to the extending direction of the cut A. It is preferable that it is arranged with an interval of 1 mm to 3 mm along the direction. That is, the interval between the cuts A is preferably 1 mm to 3 mm in a direction perpendicular to the extending direction of the cuts A.

The number of cuts A in the elastic film 2 is preferably 67,000 pieces / m ² or more, in view of better supply of bubbles into the liquid, and 125,000 pieces / m ^2. More preferably. Moreover, it is preferable that it is 500,000 piece / m < ² > or less from the point that the intensity | strength of the elastic film 2 can be maintained more reliably, and it is more preferable that it is 200,000 piece / m < ² > or less.

In the elastic membrane 2, when viewed from one side, the number of cuts A in the division with the smallest number of cuts is obtained when the area is divided into four equal parts by lines extending radially from the central portion 2a. On the other hand, it is preferable that the number of cuts A in the section having the largest number of cuts is 1.0 to 1.2 times. Thereby, there exists an advantage that the bias | inclination of supply of the bubble in a liquid can be suppressed more.
Moreover, in the said elastic film 2, when it divides into four equal parts as mentioned above when it sees from the single side | surface side, it is more preferable that the number of the cut | interruptions A in each division is the same. Thereby, there is an advantage that the uneven supply of bubbles into the liquid can be further suppressed.

As shown in FIG. 1, a plurality of the cut lines A are arranged along each of a plurality of concentric circles having different diameters around the central portion of the elastic film 2 when viewed from one side of the elastic film 2. Further, it is preferable that the elastic membrane 2 is used.
That is, the cut A is inserted in the elastic film 2 so that a plurality of concentric circles having different diameters around the central portion of the elastic film 2 are drawn by broken lines when viewed from one side of the elastic film 2. It is preferable.

  The length of each cut A along each concentric circle may be the same or different, but the size of the bubbles supplied in the liquid tends to be more uniform, and the cut A Are preferably the same in that they can be easily introduced.

In the elastic film 2, for example, as shown in FIG. 2, two types of cuts A having different lengths are provided on the central side and the outer peripheral side, and the length of the cut A on the outer peripheral side is the cut on the central side. It may be longer than the length of A.
More specifically, in the elastic film 2, for example, as shown in FIG. 2, a plurality of longer cuts A having the same length are provided along each of a plurality of concentric circles on the outer peripheral side, and the shorter same A plurality of cut lines A having a length may be formed along each of a plurality of concentric circles on the center side.
The number of concentric circles assumed in the elastic film 2 is not particularly limited.

As shown in FIGS. 1 to 3, the rib 3 includes a plurality of rod-shaped elastic members arranged radially. The rib 3 is arranged along the elastic film 2 so that the radiation center portion is adjacent to the central portion 2 a of the elastic film 2.
The rod-shaped elastic member of the rib 3 extends from the central portion 2a of the elastic film 2 to the outer peripheral side along the elastic film 2, as shown in FIGS. As a result, the ribs 3 are arranged radially along the elastic film 2.
The rib 3 is configured to be elastically deformed following the elastic deformation of the elastic film 2 due to the pressure of the supplied gas, and the radial center portion comes out to the most liquid side by the deformation.

The rib 3 may be disposed only on one side of the elastic film 2 or may be disposed on both sides.
The rib 3 is preferably disposed only on one side of the elastic film 2 and on the gas discharge side of the elastic film 2. By arranging the rib 3 only on one side of the elastic film 2 and on the gas discharge side of the elastic film 2, the elastic film 2 can be more reliably returned to the plate shape when no air is diffused. There is an advantage that the cut A can be closed more reliably.

The ends of the ribs 3 facing the radial center are preferably joined to each other as shown in FIG. 1 in that the elongation of the central portion 2a of the elastic membrane 2 during air diffusion can be further suppressed. That is, it is preferable that the ribs 3 are integrated and radially arranged by joining the end portions on one end side to each other.
In addition, as shown in FIG. 2, the edge part which faces the radiation center side of each rib 3 may mutually be separated. That is, the ribs 3 may be arranged radially so that the ends on one end side are separated from each other on the radiation center side.
Further, the end of each rib 3 facing the opposite side of the radiation center may be disposed on the inner side slightly away from the fixed portion 5 in the state where the diffused elastic material 1 is provided in the diffused gas 10. .

The number of the ribs 3 is preferably at least three. That is, it is preferable that the ribs 3 as at least three rod-like elastic members are arranged radially along the elastic film 2 in the elastic material 1 for air diffusion.
Specifically, the number of the ribs 3 may be six as shown in FIG. 1, for example, or may be three as shown in FIG. 2, for example, as shown in FIG. Alternatively, there may be four.

  The shape of the rod-shaped elastic member is not particularly limited as long as it is rod-shaped, and the shape of the rod-shaped elastic member is, for example, a rectangular bar shape whose cutting surface when cut in a direction perpendicular to the longitudinal direction, or And a semicircular bar shape having a semicircular cut surface. The semi-circular rod-shaped elastic member is arranged so that the circumferential side of the semicircle of the cross section faces the gas discharge side, and the diameter portion of the semicircle of the cross section faces the elastic film 2 side.

In the rib 3, the angle between the bar-shaped elastic members adjacent to each other is not particularly limited.
The angles between the rod-shaped elastic members adjacent to each other are the same in that the uneven expansion of the elastic film 2 can be further suppressed, and the uneven supply of bubbles and the uneven size of the bubbles can be further suppressed. It is preferable that

The length in the longitudinal direction of the rod-like elastic member is not particularly limited, but is preferably at least half of the length from the central portion 2a of the elastic film 2 to the outer peripheral end.
The thickness of the rod-shaped elastic member, that is, the length in the same direction as the thickness direction of the elastic film 2 is not particularly limited, and specific examples of the thickness include 0.1 cm to 1.0 cm. .
The width of the rod-shaped elastic member, that is, the length in the direction perpendicular to the radial direction of the rib 3 among the directions along the surface of the elastic film 2 is not particularly limited, but the width is usually 0.5 cm to 1. 5 cm.

Although the material which comprises the said rod-shaped elastic member will not be specifically limited if it is a material which elastically deforms, It is preferable that it is the same as the material which comprises the elastic film 2. FIG.
The rigidity of the diffuser elastic member 1 can be adjusted by changing the width and thickness of the rod-like elastic member. In addition, the degree of swelling of the diffuser elastic member 1 during the aeration is formed so that the cross-sectional shape perpendicular to the longitudinal direction of the rod-like elastic member changes along the longitudinal direction, thereby appropriately adjusting the degree of swelling. You can also.

  In the elastic material 1 for air diffusion provided with the rectangular elastic film 2, the uneven expansion of the elastic film 2 is further suppressed, and the uneven supply of bubbles and the uneven size of the bubbles are further suppressed. In view of this, it is preferable that the rod-like elastic member extends in a direction along the diagonal line of the elastic film 2 as shown in FIG.

  In the elastic material 1 for air diffusion according to the present embodiment, when the elastic film 2 protrudes to the liquid side due to elastic deformation at the time of air diffusion, the center side of the elastic film 2 is extended from the outer peripheral side, and the cut A is formed at the center side. It can be in a state where it is easier to spread. However, the ribs 3 are arranged on at least one side of the elastic film 2, and the ribs 3 are radially arranged by extending along the elastic film surface from the central portion 2a of the elastic film 2 to the outer peripheral side. The distance between the matching rod-like elastic members becomes narrower as it approaches the central portion 2a. Accordingly, the closer the central portion 2a is, the narrower the interval between the rod-like elastic members, the greater the elastic force of the rib 3 on the central side, and the greater the suppression force of the elastic film 2 on the central side. Accordingly, it is possible to suppress the center side of the elastic film 2 from extending more than the outer peripheral side during air diffusion, and it is possible to suppress the break A from being easily expanded on the center side of the elastic film 2. Thereby, it can suppress that a bubble is supplied excessively from the center side, and can suppress the bias | inclination of the supply of the bubble into a liquid, and the bias | inclination of the magnitude | size of a bubble.

The diffuser elastic material 1 can be manufactured by integral molding using a mold so that the ribs 3 are arranged on at least one side of the elastic film 2.
The diffuser elastic material 1 can also be manufactured by adhering the rib 3 to at least one side of the elastic film 2 using an adhesive, or by welding the rib 3 in the same manner.
The diffuser elastic material 1 is preferably manufactured by integral molding using a mold as described above in that a material having higher mechanical strength can be manufactured and a manufacturing process can be further simplified. In the elastic material 1 for air diffusion, the ribs 3 may be arranged on one side of the elastic film 2 without being bonded.

  In addition, although the said liquid is not specifically limited, Usually, it is water. Specific examples of the water include sewage and factory effluent containing activated sludge for biological treatment with activated sludge, or sewage, factory effluent, and clean water that require aeration in filtration devices and contact oxidation devices. Is mentioned.

  The gas is not particularly limited, and examples of the gas include a gas containing nitrogen gas, a gas containing oxygen gas, and a gas containing carbon dioxide gas. As the gas, air is usually used.

  Subsequently, an embodiment of the diffused gas according to the present invention will be described with reference to the drawings.

  The diffused gas 10 of the present embodiment is provided with the diffused elastic material 1. Specifically, the elastic material 1 for air diffusion having the elastic film 2 and the rib 3 is provided, and is used in the liquid to supply bubbles into the liquid. The gas diffuser elastic material 1 is elastically deformed by the pressure of the gas supplied from one surface side of the elastic membrane 2, and the gas diffused elastic material 1 projects over the other surface side of the elastic membrane 2, thereby elastic film 2. The cut A expands, the gas passing through the cut A is discharged into the liquid on the other surface side of the elastic film 2, and bubbles are supplied into the liquid.

Specifically, for example, as shown in FIG. 2, the diffused gas 10 includes an elastic film 2 disposed so that a thickness direction is a vertical direction, and a rib 3 disposed on the upper side of the elastic film 2. A diffused elastic material 1, a support portion 4 that supports the diffused elastic material 1 from below, a fixing portion 5 that airtightly fixes a peripheral portion of the diffused elastic material 1 to the support portion 4, and a diffuser And a gas supply pipe 6 for supplying gas from the lower side of the gas elastic member 1.
The diffused gas 10 as described above is supplied from the lower side through the gas supply pipe 6 to the elastic material 1 for diffused gas which is arranged on the upper side of the support part 4 and whose peripheral part is fixed to the support part 4 by the fixing part 5. Then, due to the pressure of the supplied gas, other than the peripheral edge portion of the elastic material 1 for air diffusion protrudes upward due to elastic deformation, and the cut A of the elastic film 2 expands, thereby releasing the gas into the liquid through the expanded cut A. And is configured to supply bubbles to the liquid.

  The said support part 4 is a disk-shaped thing which has a diameter more than the diameter of the elastic material 1 for aeration, and is comprised so that the elastic material 1 for an aeration may be supported from the lower side when it does not aerate.

The fixed part 5 is formed in a hollow disk shape having the same diameter as the support part 4. That is, it is formed in a ring shape (a ring shape in which a hollow region such as a circle or a rectangle is formed) so that the outer diameter is the same as the diameter of the support portion 4.
The fixing portion 5 sandwiches the peripheral portion of the diffuser elastic material 1 (peripheral portion of the elastic film 2) between the peripheral portion of the support portion 4 and the peripheral portion (elasticity) of the diffuser elastic material 1. The peripheral edge of the membrane 2 is hermetically fixed to the support 4.
Since the peripheral portion of the diffuser elastic material 1 is fixed to the peripheral portion of the support portion 4 by the fixing portion 5, when gas pressure is applied during the air diffusion, the peripheral portion of the diffuser elastic material 1 is While being fixed to the support part 4, the elastic film 2 and the rib 3 of the elastic material 1 for aeration can be projected into the liquid.
As the fixing part 5, for example, a resin fixing tool, a metal fixing tool, or the like is employed.

  The gas supply pipe 6 is arranged so as to extend in the vertical direction, the upper end side is attached to the support portion 4, and the gas supplied from the lower end side is configured to be supplied to the lower surface side of the elastic material 1 for diffuser. Has been.

  For example, a plurality of the diffused gases 10 are arranged in the horizontal direction at the bottom of a tank for storing the liquid, and are used in a state of being immersed in the liquid stored in the tank.

Although the elastic material for aeration and gas diffusion of this embodiment are as the said illustration, this invention is not limited to the elastic material for aeration and gas diffusion of the said illustration.
Further, various modes used in general elastic materials for gas diffusion and gas diffusion can be employed within a range not impairing the effects of the present invention.

  In order to evaluate the supply efficiency of bubbles into the liquid, air was supplied into water using a diffused gas provided with an elastic material for aeration, and the oxygen transfer efficiency was measured.

(Example)
The following diffused elastic material provided with an elastic membrane and ribs was used.
-Elastic membrane (made of ethylene propylene diene rubber, disc-shaped, diameter 35 cm,
The thickness is 2 mm at any location,
Multiple cuts are made along the circumference of multiple concentric circles)
However, the outer peripheral edge portion, which is 5 cm inside from the outer peripheral edge, is fixed to the support portion of the diffused gas by the resin fixing device, and therefore is not cut.
Cut length: 0.6 mm or more and 0.1 mm or less (average length is 0.8 mm)
Interval between cuts: 1 mm to 3 mm in the radial direction (radial direction from the center),
1mm to 4mm spacing in the circumferential direction (direction perpendicular to the radial direction)
(Along concentric circles)
-Ribs Ribs as six rod-shaped elastic members.
Length of rod-shaped elastic member 12.5cm from center, thickness 0.5cm, width 1cm
By integrally molding so that the rib is arranged on the liquid side surface of the elastic film where the radial center side is joined, and so that the elastic film and the rib are formed as described above, A diffused elastic material was produced.

(Comparative example)
The elastic material for aeration provided only with the elastic film of the said Example was used.

<Air diffuser conditions>
The elastic materials for gas diffusion of the above-mentioned examples and comparative examples were fixed to the support portion of the gas diffused by a resin fixing device.
The amount of water for supplying air was 20 m ³ . The amount of air supplied to the diffused gas was 20, 40, 60, 80 m ³ / m ² / hour.
In addition, the time-dependent change of dissolved oxygen concentration was measured, and the average oxygen transfer efficiency was computed with the measuring method called the unsteady method published in Japan Sewerage Association "sewage test method".
The results are shown in FIG.

1: Elastic material for air diffusion,
2: elastic membrane, 2a: central part,
3: Rib,
4: support part, 5: fixing part (resin fixing device), 6: gas supply pipe,
10: diffuse gas,
A: Cut.

In order to solve the above-mentioned problems, the elastic material for air diffusion according to the present invention is used in a liquid to supply bubbles into the liquid, and has a plate-like elasticity with a plurality of cuts penetrating in the thickness direction. The elastic membrane is elastically deformed by the pressure of the gas supplied from one side of the elastic membrane at the time of air diffusion and extends to the other surface side. An elastic material for air diffusion configured to discharge into the liquid on the other surface side and supply bubbles into the liquid,
A rib as a plurality of rod-like elastic members is further provided, and the ribs are arranged on at least one side of the elastic membrane, and are arranged radially by extending along the elastic membrane surface from the central portion of the elastic membrane to the outer peripheral side. And
The elastic film and the rib are elastically deformed by the pressure of the gas, and the radial center portion of the rib is configured to protrude most toward the liquid side by the elastic deformation .

Claims (2)

A plate-like elastic film is used in the liquid to supply bubbles into the liquid, and has a plurality of cuts penetrating in the thickness direction, and is supplied from one surface side of the elastic film when air diffuses. The elastic film is elastically deformed by the pressure of the gas, and the cut is expanded by projecting to the other side. The gas that has passed through the cut is released into the liquid on the other side of the elastic film, and bubbles are supplied into the liquid. An air diffuser elastic material configured to
A rib as a plurality of rod-like elastic members is further provided, and the ribs are arranged on at least one side of the elastic membrane, and are arranged radially by extending along the elastic membrane surface from the central portion of the elastic membrane to the outer peripheral side. An elastic material for air diffusion, characterized by   A diffused gas comprising the elastic material for aeration according to claim 1.

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