JP2005081203A - Air diffuser and air diffusion system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air diffuser and an air diffusion system which inhibit inside accumulation of water to be treated. <P>SOLUTION: The air diffusion system 1 has a water tank 10, an air diffuser 24 installed inside the tank 10 and having cylindrical supporting pipes 28 with grooves 44 formed in a part of the outer periphery of the pipe and extended in the longitudinal direction and membranes 48 having slits S and installed to cover the outer periphery of the supporting pipe, and a part of the supporting pipes is closed with a wall body 30 having air passages 34, 42 formed therein in communication with the groove, and a cylindrical gas supply pipe 22 attached to the air diffuser at the opposite side to the bottom wall 14 of the water tank, and having a ventilation hole 26 communicating with the air passages in the air diffuser. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an air diffuser and an air diffuser system for diffusing bubbles in a liquid.

  When performing aerobic treatment using aerobic bacteria in water to be treated in water treatment, an air diffuser that generates fine bubbles in a water tank in which water to be treated is stored is used. Usually, the air diffuser is disposed near the bottom of the water tank, and is attached to a gas supply pipe that supplies air from a blower outside the water tank to the air diffuser to constitute an air diffuser unit (for example, a patent). Reference 1).

In the air diffusion unit described in Patent Document 1, two air diffusers are arranged so that the axis of the introduction pipe constituting the air diffuser and the axis of the gas supply pipe (gas distribution device) are located on substantially the same plane. A device is attached to each opposing side wall of the gas supply tube.
Japanese Examined Patent Publication No. 6-067513

  However, in the case of the aeration unit as described above, if the aeration is started again after the aeration is stopped, the load on the blower that sends air to the aeration device may become excessive. It was. If the load on the blower is excessive, the blower may be stopped, which is not preferable for stable treatment of water to be treated. Therefore, the present inventors have repeatedly studied that the load on the blower increases when the above-described aeration unit is used.

  As described in Patent Document 1, the air diffuser is provided in a cylindrical shape so as to cover the outer periphery of the introduction tube in which a groove along the longitudinal direction is formed in a part of the outer periphery. And a membrane having perforations. In the air diffuser, when air is introduced into the space formed by the groove of the introduction pipe and the membrane, the membrane expands and air is diffused from the perforations into the water to be treated. In the technique described in Patent Document 1, as described above, the two air diffusers are respectively attached to the two side walls of the gas supply pipe, and the introduction pipe of the air diffuser is connected by a socket inside the gas supply pipe. Has been. Then, air is supplied to the diffuser through a ventilation opening provided in the socket.

  Usually, when air is not supplied from the gas supply pipe to the diffuser, the membrane is designed not to expand but to adhere to the introduction pipe and to prevent the water to be treated from flowing backward. However, the present inventors have actually found that the water to be treated may flow backward to the introduction pipe side when the air diffuser is stopped.

  When the water to be treated flows backward to the introduction pipe side, in the air diffusion unit in which the axes of the introduction pipe and the gas supply pipe are substantially on the same plane, the water to be treated is gas through the vent opening when the water to be treated flows backward to the introduction pipe. Accumulate in the supply pipe.

  And, when the water to be treated is accumulated in the gas supply pipe, the area that can be vented in the gas supply pipe is narrowed. Therefore, if the amount of diffused air is kept constant, the blower is burdened.

  This invention is made | formed in view of the said situation, The objective is to provide the aeration system and the aeration apparatus which suppress that to-be-processed water accumulates.

  In order to solve the above-described problems, an air diffusion system according to the present invention includes a water tank, a support tube having a cylindrical shape and a groove extending in a longitudinal direction at a part of the outer periphery thereof, and a slit. It has a membrane provided to cover the outer periphery of the support pipe, and a part of the support pipe is closed by a wall body in which an air passage communicating with the groove is formed, and is placed in the water tank. A diffuser that is attached to an air diffuser on the opposite side of the bottom wall of the water tank with respect to the diffuser, and has a vent hole that communicates with the air passage of the diffuser And a gas supply pipe.

  In the air diffusion system having the above configuration, since the support pipe is located below the gas supply pipe (the side closer to the bottom wall of the water tank), even if the water to be treated is accumulated in the gas supply pipe, When the gas passes through, the water to be treated is easily discharged by the pressure through the air diffuser located below the gas supply pipe. Therefore, the region where the water to be treated accumulates in the gas supply pipe and the gas passes through is not narrowed. In addition, in the support pipe | tube of the said air diffusion system, it is possible that the groove | channel is formed in the gas supply pipe | tube side. Further, in the support tube of the above air diffusion system, it is conceivable that the groove is formed on the bottom wall side.

  In the above-described membrane, it is desirable that the slit is formed in a region other than the region facing the groove. Thereby, when the gas supply to the air diffuser is stopped, the region where the slit is located is in close contact with the support tube, and therefore, the water itself is prevented from flowing back. Moreover, it is easy to ventilate the gas supplied from the gas supply pipe to the tip end side of the support pipe.

  An air diffuser according to the present invention is an air diffuser that is connected to a gas supply pipe and diffuses a gas supplied from the gas supply pipe. The air diffuser has a cylindrical shape and circumscribes the gas supply pipe at the outer periphery thereof. And a support tube in which a groove extends in the longitudinal direction in a part of the outer periphery, and a membrane in which a slit is formed so as to cover the outer periphery of the support tube, and a part in the support tube is It is closed by a wall body in which an air passage communicating with the groove is formed, and a groove is formed on the outer periphery opposite to the connection portion with the gas supply pipe. In this case, the gas is supplied from the gas supply pipe to the diffuser through the air passage communicating with the gas supply pipe. The gas introduced into the diffuser flows into the space formed by the groove and the membrane through the air passage, and is diffused as bubbles from the slit of the membrane. Since the groove is formed on the outer periphery of the support pipe opposite to the connection with the gas supply pipe, the gas flowing into the support pipe from the gas supply pipe reaches the outer periphery on the side opposite to the connection section. Then, it flows in the major axis direction of the support tube and flows into the groove. Therefore, the gas flow from the gas supply pipe to the groove can be made smoother.

  According to the present invention, water to be treated can be prevented from accumulating inside.

  In the following, preferred embodiments of the present invention will be described with reference to the drawings. In the following description, the same reference numerals are used for the same elements, and duplicate descriptions are omitted. In addition, the dimensional ratio in the drawing does not necessarily match that described.

(First embodiment)
With reference to FIGS. 1-3, the structure of the aeration system which concerns on this embodiment is demonstrated. FIG. 1 is a cross-sectional view schematically showing a configuration of an air diffusion system 1 according to the present embodiment. The air diffusion system 1 is used for supplying air bubbles to the water to be treated when the water to be treated such as sewage and industrial wastewater is subjected to aerobic treatment using aerobic bacteria in water treatment. . The aeration system 1 includes an aerobic treatment tank (water tank) 10 that stores the treated water, and an aeration unit 12 that is disposed in the aerobic treatment tank 10 and supplies fine bubbles into the treated water. . FIG. 1 shows a state in which treated water is stored in the aerobic treatment tank 10.

  The aerobic treatment tank 10 has a substantially rectangular shape in plan view and a concave sectional shape, and has a bottom wall 14 and a side wall 16. However, the shape and form of the aerobic treatment tank are not limited to those of the present embodiment, and can be adapted to the installation location, the amount of treated water, the nature of treated water, and the like.

  As shown in FIG. 1, the air diffusion unit 12 is disposed in the aerobic treatment tank 10 and in the vicinity of the bottom wall 14. Air is blown to the air diffusion unit 12 from the blower 18 provided outside the aerobic treatment tank 10 through the air pipe 20. The blower 18 is a blower that sends air and can adjust the air supply amount. The shape and material of the air pipe 20 may be appropriately selected in consideration of the nature of the water to be treated, the type of gas to be blown, the blown amount, and the like.

  1 and 2, the air diffusion unit 12 includes an air supply pipe (gas supply pipe) 22 connected to the air pipe 20 and an axis β in a direction substantially orthogonal to the axis α of the air supply pipe 22. And a plurality of air diffusers 24 having. FIG. 2 is a perspective view schematically showing the configuration of the air diffusion unit 12 in the air diffusion system 1.

  The air supply pipe 22 is a cylindrical pipe made of stainless steel, vinyl chloride resin (vinyl chloride), iron, or the like and closed at both ends. The air supply pipe 22 is directly connected to and integrated with the air pipe 20. Note that the air supply pipe 22 and the air pipe 20 may be freely attached and detached via a connecting unit (not shown). The air supply pipe 22 is fixed to the side opposite to the bottom wall 14 of the aerobic treatment tank 10 in the air diffuser 24. In other words, it is fixed on the air diffuser 24 in the vertical direction (the direction from the bottom wall 14 toward the water surface). In the air supply pipe 22, a vent hole 26 is formed at a connection portion with the air diffuser 24, and the air supply pipe 22 supplies air from the blower 18 blown through the air pipe 20 to the air diffuser 24. It has a function to supply.

  The air diffuser 24 converts the air supplied from the air supply pipe 22 into fine bubbles and diffuses it into the water to be treated. The air diffuser 24 has a cylindrical support tube 28. In the support tube 28, the vicinity of the central portion in the longitudinal direction is closed by the wall body 30. In other words, the support tube 28 is a rod-shaped body having two hollow portions 32 and 32 having one end opened and the other end separated by the wall body 30.

  The support pipe 28 and the air supply pipe 22 are connected above the wall body 30. Thereby, as shown in FIGS. 1 and 2, both ends of the support tube 28 are free ends. As can be understood from FIGS. 1 and 2, a raised portion 34 is formed on the wall body 30 of the support tube 28 so as to be in contact with the outer peripheral surface of the air supply tube 22. The raised portion 34 is formed integrally with the support tube 28. However, the raised portion 34 may be fixed to the outer periphery after first forming a support tube in which the raised portion is not formed. The raised portion 34 and the wall body 30 are provided with a first air passage 36 that communicates with the air hole 26 of the air supply pipe 22 and extends downward from the air hole 26. The air diffuser 24 is introduced.

  Further, the support pipe 28 and the air supply pipe 22 are fixed by a fastening fitting 38 and a bolt 40 using the vent hole 26 and the first vent path 36. The fastening fitting 38 is a substantially rectangular flat plate whose length in the longitudinal direction is longer than the diameter of the vent hole 26, and is screwed with the bolt 40. For example, the air supply pipe 22 may be fixed to the air diffuser 28 as follows. That is, the bolt 40 is passed from the side opposite to the side where the raised portion 34 is formed in the support tube 28, and the fastening fitting 38 is attached to the tip of the bolt 40 protruding from the support tube 28. Subsequently, the fastening fitting 38 is inserted into the air supply pipe 22 through the air hole 26 of the air supply pipe 22, and the bolt 40 is tightened to fix the air supply pipe 22 and the support pipe 28. As a result, the raised portion 34 of the support tube 28 and the air supply tube 22 are brought into close contact with each other, so that water to be treated can be prevented from entering the connecting portion.

  In addition, referring to FIG. 1, second ventilation paths 42, 42 are formed in the wall body 30 obliquely upward from the lower side of the first ventilation path 36. Grooves 44, 44 are formed on the outer periphery of the support tube 28, which communicate with the respective second ventilation paths 42 and extend from the wall body 30 side to the front end of the support tube 28. Referring to FIGS. 1 and 3, the groove 44 is formed in the longitudinal direction on the upper side of the support pipe 28 (that is, on the air supply pipe 22 side). On the other hand, a convex portion 46 is provided in a region on the lower side (that is, the side closer to the bottom wall 14) of the support tube 28 and facing the groove 44. The “upper side” and “lower side” in the description of the positions of the groove 44 and the convex portion 46 are based on a plane parallel to the bottom wall 14 and including the axis β. FIG. 3 is an end view taken along line III-III in FIG.

  Referring to FIGS. 1 and 3, the entire outer periphery of the support tube 28 is covered with a membrane 48. The membrane 48 is made of rubber, for example, and the end thereof is fixed to the support tube 28 by a fixing tool 50 such as a ring-shaped band. Further, the membrane 48 forms the diffuser tube 52 in cooperation with the groove 44 described above. In the membrane 48, a plurality of air diffusion slits S are formed in a portion other than the region facing the groove 44 and the convex portion 46 of the support tube 28. The length in the longitudinal direction of the support tube 28 in the air diffusion slit S is, for example, 0.5 to 1.0 mm.

  Next, the operation of the air diffusion system 1 having the above configuration will be described. First, when the blower 18 is operated and air is blown to the air pipe 20, the air is supplied to the air diffusion unit 12 near the bottom wall 14 of the aerobic treatment tank 10 through the air pipe 20.

  As described above, since the air pipe 20 and the air supply pipe 22 are connected, air is supplied from the air pipe 20 into the air supply pipe 22. Then, as shown in FIG. 2, air is introduced into the plurality of air diffusers 24 fixed to the air supply pipe 22 through the air holes 26.

  In the air diffuser 24, the air sent through the air hole 26 of the air supply pipe 22 is guided to the air diffuser 52 through the air passage composed of the first air passage 36 and the second air passage 42. As shown in FIG. 3, the air sent to the diffuser tube 52 enters between the outer peripheral surface of the support tube 28 and the membrane 48, expands the membrane 48, and fine bubbles from the diffuser slit S into the water to be treated. As diffused. Since the air diffusion slit S is not formed in the membrane 48 on the groove 44, air easily passes through the air diffusion tube 52 to the vicinity of the tip portion, and the convex portion 46 is formed in a region facing the groove 44 in the support tube 28. Therefore, the membrane 48 is easily expanded. Therefore, the fine bubbles are easily diffused evenly in the longitudinal direction of the support tube 28. Moreover, since one end (the free end side of the support tube 28) of each hollow part 32 is open, the water to be treated flows into the hollow part 32. Therefore, even if air is introduced into the air diffuser 24, the air diffuser 24 is prevented from floating due to the influence of the air.

  When the blower 18 stops blowing air, the membrane 48 comes into close contact with the support tube 28 with the diffuser slit S closed by the elasticity of the membrane 48 itself and the pressure of the water to be treated. Yes.

  In the air diffusion unit 12 of the present embodiment, the air supply pipe 22 is disposed on the upper side of the air diffuser 24, in other words, the axis α of the air supply pipe 22 and the axis β of the air diffuser 24 are different. It is important that the axis β is closer to the bottom wall 14 than the axis α.

  When the blowing from the blower 18 is stopped, the diffuser slit S of the membrane 48 is closed and the membrane 48 is in close contact with the support tube 28. Further, the diffusion slit S is not formed in the membrane 48 on the groove 44. Therefore, it is difficult for the water to be treated to flow into the air diffuser 24. However, until reaching the present invention, the inventors have designed water to be treated to the air diffuser 24 and the air supply pipe 22 even if the air diffuser slit S is closed when the blower 18 is stopped. It was found that inflow of water could occur.

  In the conventional air diffusion unit, since the axis α and the axis β are configured to be substantially on the same plane, the air hole through which air passes from the air supply pipe to the support pipe also includes the axis α and the axis β. It will be located in the vicinity. In this case, since the position of the vent hole is higher than the bottom wall of the air supply pipe (the wall closer to the bottom wall 14 of the water tank 10), the water to be treated collects below the vent hole. . For this reason, it has been difficult to discharge the water to be treated through the support pipe even if the blower is operated. Thereby, the state which the to-be-processed water accumulated in the air supply pipe continued for a long time, and the area | region which can ventilate in an air supply pipe had decreased. Thus, when the air diffusion performance similar to the initial time when the air diffusion unit is installed in the aerobic treatment tank is realized in a state where the air-permeable region is reduced, the load on the blower is increased.

  On the other hand, according to the configuration of the air diffusion unit 12 of this embodiment, even if the water to be treated flows into the air diffuser 24, the air diffuser 24 is located below the bottom (bottom) of the air supply pipe 22. The ventilation hole 26 is formed on the lower side of the air supply pipe 22. Therefore, in addition to the fact that the water to be treated does not easily flow into the air supply pipe 22, when the blower 18 is once stopped and restarted, the water to be treated is likely to flow toward the diffuser 24. . In other words, the structure is such that the water to be treated is not easily collected in the air supply pipe 22. For this reason, a sufficiently permeable area in the air supply pipe 22 can be secured, so that air can be easily blown to the air diffuser 24, an increase in the load on the blower 18 is suppressed, and the object to be processed is efficiently processed. Can diffuse into the water.

  In the present embodiment, one aerobic treatment tank 10 is described. For example, each of the plurality of aerobic treatment tanks 10 is provided with an air diffusion unit 12, and each air diffuser from one blower 18. The effect described above becomes more effective when air is sent to the unit 12. When a conventional air diffuser unit is used as a plurality of air diffuser units, the ventilation capacity of the air supply pipe of each air diffuser unit may decrease as described above. Such a decrease in ventilation capacity depends on the operating conditions of the diffuser, such as starting and stopping aeration, so the decrease in ventilation capacity in each aeration unit is not uniform. Therefore, if the ventilation capacity of a certain air diffusion unit is reduced, more air from the blower is supplied to the other air diffusion unit side, and the processing capacity of the aerobic treatment tank in which the air diffusion unit is installed is reduced. descend.

  On the other hand, when the aeration unit 12 of the present embodiment is installed as described above, the water to be treated does not collect in the air supply pipe 22 even if the aeration from the aeration unit 12 is temporarily stopped. Since it is discharged immediately even if it accumulates, the air supply capacity of the air supply pipe 22 of each air diffusion unit 12 becomes substantially equal. Therefore, it is possible to realize the same aerobic treatment in the plurality of aerobic treatment tanks 10 in which the respective aeration units 12 are installed.

(Second Embodiment)
FIG. 4 is a cross-sectional view schematically showing a configuration of an air diffuser unit 56 to which another embodiment of the air diffuser according to the present invention is applied. 4 has a groove 62 formed on the outer periphery of the support tube 60 of the air diffuser 58 on the opposite side of the connection portion (that is, the raised portion 34) between the air supply tube 22 and the support tube 60. This is different from the air diffusion unit 12 of the first embodiment. Further, the support pipe 60 is different from the air diffusion unit 12 in that a convex portion 64 is formed in a region facing the groove 62 on the outer periphery on the air supply pipe 22 side. Further, the wall 30 is formed with a ventilation path 66 that communicates with the air hole 26 of the air supply pipe 22 and that has an end opposite to the air supply pipe 22 that extends toward the groove 62 and is connected to the groove 62. It is different from the aeration unit 12 in that. The air passage 66 corresponds to an air passage composed of the first air passage 34 and the second air passage 42. Other configurations are the same as those of the air diffusion unit of the first embodiment.

  In the above configuration, the air sent to the air passage 66 through the air hole 26 of the air supply pipe 22 is horizontal (or the longitudinal length of the support pipe 60) from the end opposite to the air hole 26 side in the air passage 66. Direction) and flows into the groove 62. Therefore, it is possible to make the air flow to the air diffuser 52 constituted by the groove 62 and the membrane 48 smoother.

  As the air diffusion system to which the air diffusion unit 56 is applied, the air diffusion unit 12 of the air diffusion system 1 in FIG.

  As mentioned above, although preferred embodiment of this invention was described in detail, it cannot be overemphasized that this invention is not limited to the said embodiment. For example, the shapes of the air supply pipe 22 and the support pipe 24 are cylindrical, but are not necessarily limited to a cylindrical shape. For example, the air supply pipe may have a cylindrical shape with a substantially square cross section.

  Moreover, although air is used as a gas used in the air diffusion system, a gas corresponding to the properties of the water to be treated may be used, and for example, oxygen or ozone may be used. Furthermore, although the convex portions 46 and 64 are provided on the support tubes 28 and 60, the convex portions may not necessarily be provided. Further, the support pipes 28 and 60 are formed with raised portions 34 so that the outer periphery of the air supply pipe 22 and the raised portions 34 are in contact with each other. The air supply pipe 22 is directly connected to the outer periphery of the support pipes 28 and 60. You may connect.

  Furthermore, although the diffuser system is used for carrying out the aerobic treatment in the water treatment, it is not necessarily limited to the aerobic treatment. The present invention can also be applied to applications where gas needs to be supplied into the liquid, such as aquaculture, or when stirring with gas. Moreover, although it is set as the aerobic treatment tank for implementing the aerobic process in a water treatment as a water tank, it does not necessarily need to be limited to this case. For example, in the case of the aquaculture described above, a tank for aquaculture may be used. Furthermore, when the aeration system is applied in the sea or the like, the bottom of the sea corresponds to the bottom of the aquarium. In the above description, the gas supply pipe is an air supply pipe connected to an air pipe for supplying air from the blower. May be a gas supply pipe.

It is sectional drawing which shows schematically the structure of one Embodiment of the air diffusion system which concerns on this invention. It is a perspective view which shows roughly the structure of the air diffusion unit in the air diffusion system of FIG. It is an end elevation at the time of cut | disconnecting in the plane which follows the III-III line | wire of FIG. It is sectional drawing which shows schematically the structure of other embodiment of the air diffusion unit which concerns on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Air diffuser system, 10 ... Aerobic processing tank (water tank), 12 ... Air diffuser unit, 14 ... Bottom wall, 18 ... Blower, 20 ... Air piping, 22 ... Air supply pipe (gas supply pipe), 24 ... Diffuse 26 ... vent hole, 28 ... support pipe, 30 ... wall body, 32 ... hollow part, 36 ... first vent path, 42 ... second vent path, 44 ... groove, 46 ... convex part, 48 ... membrane, 52 ... Air diffuser, 56 ... Air diffuser unit of the second embodiment, 58 ... Air diffuser, 60 ... Support pipe, 62 ... Groove, 64 ... Projection, 66 ... Air vent.

Claims (5)

A tank,
A cylindrical support tube having a groove extending in the longitudinal direction in a part of the outer periphery thereof, and a membrane in which a slit is formed so as to cover the outer periphery of the support tube, A part of the support pipe is closed by a wall body in which an air passage communicating with the groove is formed, and an air diffuser disposed in the water tank;
A cylindrical gas supply that is mounted on the air diffuser on the side opposite to the bottom wall of the water tank with respect to the air diffuser and has a vent hole communicating with the air passage of the air diffuser. An air diffusion system comprising a tube.   The air diffusion system according to claim 1, wherein the groove is formed on the gas supply pipe side in the support pipe.   The aeration system according to claim 1, wherein the groove is formed on the bottom wall side in the support pipe.   The air diffusion system according to any one of claims 1 to 3, wherein the slit is formed in a region other than the region on the groove. An air diffuser connected to a gas supply pipe and diffusing the gas supplied from the gas supply pipe,
A support pipe that is cylindrical and circumscribes the gas supply pipe on its outer periphery, and a groove extends in the longitudinal direction in a part of the outer periphery;
A slit is formed and provided with a membrane provided to cover the outer periphery of the support tube,
A part of the support pipe is closed by a wall body in which an air passage communicating with the groove and the gas supply pipe is formed, and the groove is formed on the outer periphery opposite to the connection portion with the gas supply pipe. An air diffuser characterized by being formed.

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