WO2012056740A1

WO2012056740A1 - Membrane air diffuser

Info

Publication number: WO2012056740A1
Application number: PCT/JP2011/055988
Authority: WO
Inventors: 克行保科; 久人辻川; 義雄北川
Original assignee: 株式会社クボタ
Priority date: 2010-10-29
Filing date: 2011-03-15
Publication date: 2012-05-03
Also published as: CN103124697A; CN103124697B

Abstract

A membrane air diffuser is provided with: a body which is formed by joining together a lower structure member (3) and an upper structure member (4) at the peripheral edges of both the lower and upper structure members (3, 4), the lower structure member (3) consisting of a sheet-like material or a plate-like material, the upper structure member (4) consisting of a sheet-like material; and an air supply mouth section (8) which penetrates through the upper structure member (4), is joined in a watertight manner at the outer surface of the air supply mouth section (8) to the upper structure member (4), can be in contact in a watertight manner with the lower structure member (3) at the opening edge of the inner opening of the air supply mouth section (8), the inner opening facing the lower structure member (3), and can be separated from the lower structure member (3).

Description

Membrane diffuser

The present invention relates to a membrane-type air diffuser installed in a tank of a sewage treatment facility or the like, and relates to a technique for performing air diffusion for biological treatment or stirring.

Conventionally, examples of this type of air diffuser include those shown in FIGS. In this case, a diffuser film 52 is mounted on the upper surface of the base plate 51, and an air supply port 53 is provided at a predetermined position on the film surface of the diffuser film 52. The air supply port 53 is connected to the base plate 51 and the diffuser film 52. It communicates with. The diffuser film 52 is a synthetic resin film or synthetic rubber film provided with a large number of small holes 54, and has a structure in which the periphery of the diffuser film 52 is fixed to the base plate 51 by a fixing portion 55.

As shown in FIG. 16, when the operation is stopped, the diffuser membrane 52 receives water pressure and comes into contact with the upper surface of the base plate 51, and the small holes 54 of the diffuser membrane 52 are closed. During operation, compressed air is supplied between the base plate 51 and the diffuser membrane 52. At this time, as shown in FIG. 17, the diffuser membrane 52 swells away from the upper surface of the base plate 51 due to the pressure of the compressed air, and the small holes 54 are opened, and the air is diffused into the water through the small holes 54. Qi is done.

As an apparatus having such a configuration, for example, there is an air diffuser described in Japanese Patent Publication No. 3997176. This diffuser is a sheet-like diffuser membrane in which a large number of fine pores are formed on one surface of a flat base plate. The four sides of the diffuser membrane are arranged on the four sides of the base plate. It is fixed with a frame.

In this air diffuser, after the air supply to the air diffuser is stopped, the air supply port is opened to the atmosphere, the remaining air is discharged, and the air diffuser is quickly contracted. By this operation, the dirt that has entered the fine pores is shaken off. In addition, the air is resent and the diffusing membrane is inflated vigorously to expand the fine pores, thereby releasing dirt.

In addition, the diffuser described in Japanese Patent Publication No. 2500071 is obtained by covering a circular holder having a large number of slits on the upper surface of a disk-shaped holder having an air ejection nozzle in the center. An annular protrusion is formed on the peripheral edge of the air ejection nozzle of the holder, and the center of the membrane is a portion without a slit.

And when aeration is stopped, water is prevented from flowing back to the air jet nozzle by being pressed by water pressure and the portion without a slit of the membrane is in close contact with the protrusion.

By the way, as an attachment structure of the air supply port, for example, there is one described in Japanese Patent Laid-Open Publication No. 2007-167856. The outline is shown in FIG. Here, the structure which provides the air supply opening 102 on the film | membrane surface of the diffuser film | membrane 101 is shown.

The air supply unit 104 of the air supply port 102 is disposed on the base plate 103, and the packing 106 is disposed around the air connection port 105 of the air supply unit 104. A diffuser film 101 is disposed so as to cover the air supply unit 104 and the packing 106, and the air connection port 105 projects to the upper surface side of the diffuser film 101. A holding plate 107 is disposed around the air connection port 105 on the upper surface side of the diffuser membrane 101, and a screw portion 108 screwed into the air connection port 105 presses the holding plate 107 with its tightening force, thereby holding the holding plate. A diffuser membrane 101 is sandwiched between the seal 107 and the packing 106 in a watertight manner. The fixing frame 110 fixes the outer peripheral edge of the diffuser membrane 101 and the outer peripheral edge of the base plate 103 via the packing 109.

In such a configuration, when the supply of air to the air supply port 102 is stopped, the surrounding liquid to be treated that receives water pressure flows between the base plate 103 and the air diffuser film 101 through the air diffuser film 101, The air flows back from the air port 102 into the pipe (not shown).

This invention solves the above-mentioned subject, and it aims at providing the membrane type diffuser which can prevent backflow of the to-be-processed liquid of the circumference | surroundings also in the state which stops air supply.

In order to solve the above problems, the membrane-type air diffuser according to the present invention is a main body in which a lower constituent member made of a sheet-like member or a plate-like member and an upper constituent member made of a sheet-like member are joined to each other at both peripheral portions. And, through the upper component material, and joined to the upper component material in a watertight manner on the outer surface, and can contact the lower component material in a watertight manner at the opening edge of the inner opening facing the lower component material, and from the lower component material It is characterized by having an air supply port that can be separated.

With this configuration, the upper component and the lower component are brought into close contact with each other by receiving external water pressure in a state where air is not supplied to the inside of the main body through the air supply port, and the inner opening of the air supply port is lower at the opening edge. The lower structural member closes the inner opening of the air supply port, in contact with the structural member in a watertight manner. Therefore, it is possible to prevent the surrounding liquid to be treated from flowing backward.

When air is supplied through the air supply port, the upper component is expanded and the air supply port is separated from the lower component, and the inner opening of the air supply port is opened.

Further, in the membrane-type air diffuser of the present invention, at least one of a part of the lower component material that contacts the air supply port and a part of the opening edge of the air supply port that contacts the lower component material is a soft material. Features.

This configuration improves the water tightness of the contact portion between the opening edge of the air supply port and the lower component, and increases the backflow prevention effect.

Further, in the membrane-type air diffuser of the present invention, the main body is a bag-like body in which the lower constituent material and the upper constituent material are sheet-like members.

With this configuration, when the air supply to the air supply port is stopped, the lower constituent material and the upper constituent material are easily brought into close contact with each other by the water pressure in the tank, and the backflow prevention effect is enhanced.

Further, in the membrane-type air diffuser of the present invention, the air supply port is characterized in that there are multiple opening edges that contact the lower component material around the axis of the air supply port.

This structure improves the sealing performance because the opening edge of the air supply opening and the contact portion of the lower component material have a multiple structure.

Further, in the membrane type air diffuser of the present invention, the upper component material is characterized in that the periphery of the air supply port is impermeable.

Further, the membrane-type air diffuser of the present invention is characterized in that a flange portion is provided along the periphery of the opening edge of the inner opening to form a flange surface that can be brought into contact with and separated from the lower component material.

The reaction tank of the present invention includes a tank body for storing a target treatment liquid and an air diffuser disposed in the tank, and the air diffuser is a membrane air diffuser according to any one of claims 1 to 5. It consists of an apparatus.

As described above, according to the present invention, even in a state where air supply is stopped, the peripheral liquid to be treated flows backward by watertight contact between the opening edge of the inner opening of the air supply port and the lower component. Can be prevented.

The top view which shows the membrane type diffuser in embodiment of this invention Sectional drawing which shows the air inlet in the same embodiment Lower perspective view showing air supply port in the same embodiment Upper perspective view showing air supply port in the same embodiment FIG. 6 is a cross-sectional view taken along line AA in FIG. 6, showing an air supply port according to another embodiment of the present invention. Bottom view of air supply port in the same embodiment Sectional drawing which shows the air inlet in other embodiment of this invention Sectional drawing which shows the air inlet in other embodiment of this invention Sectional drawing which shows the air inlet in other embodiment of this invention Sectional drawing which shows the air inlet in other embodiment of this invention The top view which shows the membrane type diffuser in other embodiment of this invention Sectional drawing which shows the air inlet in the same embodiment Lower perspective view showing air supply port in the same embodiment Upper perspective view showing air supply port in the same embodiment A perspective view showing a conventional air diffuser Schematic diagram showing the operation of a conventional air diffuser Schematic diagram showing the operation of a conventional air diffuser Sectional drawing which shows the structure of the conventional air inlet

Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 4, the membrane-type air diffuser 1 has a structure in which a main body 2 is joined to each other at both peripheral portions of a lower constituent material and an upper constituent material. In the present embodiment, the lower sheet-like member 3 and the upper sheet-like member 4 constituting the lower component and the upper component are made of a soft material such as polyurethane, polyester fiber, polyurethane reinforced with nylon fiber, or silicon rubber.

In the present embodiment, the main body 2 forms a bag-like body in which the lower sheet-like member 3 and the upper sheet-like member 4 are joined to each other by welding. However, the lower component material may be a rigid plate member. Here, the bag-like body of the main body 2 has a shape that extends long in a band shape, but the shape of the bag-like body may be any shape such as a balloon shape, a disk shape, a square shape, a rhombus shape, and a column shape.

The lower sheet-like member 3 is made of an air-impermeable sheet-like member, and the upper sheet-like member 4 is an air-permeable sheet-like member 6 that forms the air-diffusing region 5 and an air-impermeable sheet-like material that surrounds the air-diffusing region 5. It consists of the member 7.

An air supply port 8 is provided on the upper surface of one side of the bag-like body, and the air supply port 8 is connected to an air supply source (not shown). The air supply port 8 passes through the air-impermeable sheet-like member 7 in the upper sheet-like member 4, the outer opening 9 is located outside the main body 2, and the inner opening 10 is located inside the main body 2 and the lower sheet-like member. 3, the opening edge 11 of the inner opening 10 is shaped so as to be able to contact the lower sheet-like member 3 in a watertight manner.

The air supply port 8 has a hollow flange portion 12 on the lower side located inside the main body 2. The flange portion 12 concentrically surrounds the inner opening 10, and is formed on the upper surface of the flange portion 12. The air-impermeable sheet-like member 7 of the upper sheet-like member 4 is welded in a watertight manner. The lower end edge 13 of the flange portion 12 has a shape capable of being in watertight contact with the lower sheet-like member 3 in the same manner as the opening edge 11 of the inner opening 10.

The membrane-type air diffuser of the present invention can be applied to various reaction tanks, for example, a reaction tank including a tank body for storing a target treatment liquid in water treatment or the like and an air diffuser disposed in the tank body. For example, a membrane diffuser can be applied to the diffuser.

Hereinafter, the operation of the above configuration will be described. In an operation stop state in which air is not supplied to the inside of the main body 2 through the air supply port 8, the bag-like body 2 receives the surrounding water pressure and the air-permeable sheet-like member 6 of the upper sheet-like member 4 and the air-impermeable sheet-like shape. When the member 7 is press-contacted with the air-impermeable sheet-like member of the lower sheet-like member 3, the soft materials are brought into close contact with each other to exhibit high water blocking properties.

Further, the inner opening 10 of the air supply port 8 is in watertight contact with the lower sheet-like member 3 at the opening edge 11, and the lower end edge 13 of the flange portion 12 is in watertight contact with the lower sheet-like member 3 and is sealed in multiple layers. In the stopped state, the lower sheet-like member 3 closes the inner opening 10 of the air supply port 8 in a watertight manner.

For this reason, even if water enters the inside of the main body 2 from the small hole of the air-permeable sheet-like member 6, the periphery of the air inlet 8 is sealed in multiple layers, so that the water that receives the surrounding water pressure is supplied Backflow through the mouth 8 can be prevented.

Therefore, troubles caused by the backflow of sewage, such as an increase in pressure loss and uneven foaming at the time of air diffusion, can be prevented. Therefore, it is not necessary to always perform aeration to prevent the above-described trouble, and it is possible to completely stop the aeration, thereby improving energy saving and maintenance.

During operation, an air supply source (not shown) supplies air at a predetermined pressure through the air supply port 8 into the bag-like body of the main body 2. During this operation, the bag-like body is inflated by the pressure of the air supplied to the inside, the upper sheet-like member 4 is inflated, the air inlet 8 is separated from the lower sheet-like member 3, and the inner opening 10 of the air inlet 8 is opened. The The air that has flowed into the main body 2 is ejected from the diffuser region 5 through the air-permeable sheet-like member 6 that forms a diffuser film, and the ejected air is diffused into the water to be treated inside the reaction tank. Thus, since the inner opening 10 of the air supply port 8 is opened and closed by the vertical movement of the air supply port 8, it is not necessary to provide an air passage that is always open as in the prior art at the lower end of the air supply port 8.

As shown in FIGS. 5 and 6, a plurality of ribs 14 connected to the air supply port 8 and the flange portion 12 are provided on the lower end side of the air supply port 8 surrounded by the flange portion 12. The number of can be set arbitrarily. By strengthening the structure of the flange portion 12 with the ribs 14, the watertightness between the air supply port 8 and the lower sheet-like member 3 and the watertightness between the flange portion 12 and the lower sheet-like member 3 are improved. Further, it is possible to suppress damage due to deformation of the air supply port 8.

As shown in FIG. 7, the flange portion 12 can also serve as the lower end side of the air supply port 8, and the air supply port 8 can have a shape that expands in diameter on the lower end side.

As shown in FIG. 8, it is also possible to make the flange part 12 into a flat shape and increase the area where the flange part 12 and the lower sheet-like member 3 are in watertight contact.

As shown in FIG. 9, an annular rib 15 surrounding the air supply port 8 can be provided on the lower end side of the air supply port 8 surrounded by the flange portion 12, and the annular rib 15 is connected to the air supply port 8. Any number can be provided between the flange portion 12 and the flange portion 12.

With this configuration, the inner opening 10 of the air supply port 8 is in watertight contact with the lower sheet-like member 3 at the opening edge 11, and the flange portion 12 and the annular rib 15 are in watertight contact with the lower sheet-like member 3 at the lower end. The lower sheet-like member 3 closes the inner opening 10 of the air supply port 8 in a watertight manner in a state of being in contact and being sealed in multiple layers. For this reason, the circumference | surroundings of the air inlet 8 will be sealed in multiple, and the function which prevents the reverse flow of the water at the time of the air inlet 8 closing will increase.

As shown in FIG. 10, the flange portion 12 has a flat shape to increase the area in which the flange portion 12 and the lower sheet-like member 3 are in watertight contact with each other. It is also possible to arrange the ring 16.

11 to 14 show another embodiment of the present invention. Here, a flat plate-shaped flange portion 121 is provided around the lower end edge 13 of the hollow flange portion 12, and the lower sheet-like member 3 is provided along the periphery of the opening edge 11 of the inner opening 10 in the flange portion 121. A flange surface 122 that can be contacted and separated is formed.

The flat plate-shaped flange portion 121 may be provided either inside or outside the lower end edge 13 of the hollow flange portion 12 or may be provided across the inner and outer sides. The flat plate-shaped flange portion 121 is made of rubber, resin, or the like, and the shape may be any of a circle, an ellipse, and a polygon. It is also possible to provide a contact plate facing the hollow flange portion 12 or facing the flat plate-shaped flange portion 121 on the bottom surface outside the lower sheet-like member 3.

A plurality of ribs 141 connected to the hollow flange portion 12 and the flat flange portion 121 are provided around the lower end side of the hollow flange portion 12, and the number of ribs 141 can be arbitrarily set. By strengthening the structure of the flange portion 121 with the rib 141, the water tightness between the air supply port 8 and the lower sheet-like member 3 and the water tightness between the flange portion 121 and the lower sheet-like member 3 are improved. Further, it is possible to suppress damage due to deformation of the air supply port 8.

According to this configuration, at the time of exhaust, the lower sheet-like member 3 watertightly closes the inner opening 10 of the air supply port 8, and the flange surface 122 of the flat plate-shaped flange portion 121 is the opening edge 11 of the inner opening 10. , The lower sheet-like member 3 in the region surrounded by the flat plate-shaped flange portion 121 is flattened.

For this reason, the lower sheet-like member 3 comes into contact with the inner opening 10 of the air supply port 8 in a flat state without any wrinkles, and secure water tightness can be ensured.

In the above-described embodiments, the lower constituent material has been described as a sheet-like member. However, in the present invention, the lower constituent material is not limited to a sheet-like member, and may be a hard plate. In addition, it is more desirable that at least one of the contact portion that contacts the air supply port on the lower constituent material or the opening edge of the air supply port is a soft material. When the lower component material is a hard plate, a soft sheet can be laminated on the upper surface of the hard plate.

Claims

A main body in which a lower constituent material made of a sheet-like member or a plate-like member and an upper constituent material made of a sheet-like member are joined to each other at both peripheral edges, and the upper constituent material penetrates the upper constituent material and is watertight on the outer surface. A membrane-type air diffuser comprising an air supply port that can be joined and watertightly contacted with the lower component at the opening edge of the inner opening facing the lower component and can be separated from the lower component .
2. The membrane type powder according to claim 1, wherein at least one of a portion of the lower constituent member that contacts the air supply port and a portion of the opening edge of the air supply port that contacts the lower constituent member is a soft material. Qi device.
The membrane-type air diffuser according to claim 1, wherein the main body is a bag-like body in which the lower constituent material and the upper constituent material are sheet-like members.
The membrane-type air diffuser according to claim 1, wherein the air supply port has a plurality of opening edges that contact the lower component material around the axis of the air supply port.
The membrane-type air diffuser according to claim 1, wherein the upper component material is impermeable around the air supply port.
2. The membrane-type air diffuser according to claim 1, wherein a flange portion is provided along the periphery of the opening edge of the inner opening to form a flange surface capable of contacting and separating from the lower component.
A tank body for storing the target treatment liquid, and an air diffuser disposed in the tank body, wherein the air diffuser comprises the membrane-type air diffuser according to any one of claims 1 to 6. To the reaction tank.