JP4539568B2 - Air diffuser and diffuser - Google Patents

Description

  The present invention relates to an air diffuser for supplying oxygen into an aeration tank when organic sludge such as sewage and industrial wastewater is treated with activated sludge, and an air diffuser provided with the air diffuser.

About.

  Conventionally, when activated sludge is used for organic sludge such as sewage and industrial wastewater, a diffuser for supplying oxygen into the aeration tank uses a plate-like or cylindrical porous ceramic or resin as the aeration element. Things are known.

  Since the air diffuser contains fine dust in the supply air, it accumulates in the air diffuser element by aeration, and the ventilation resistance increases year by year. By the way, when aeration is performed intermittently, the sewage in the aeration tank flows backward in the aeration element, and dust and fine particles in the sewage adhere to the aeration holes, causing the holes to become clogged, It was necessary to replace the diffuser element at an early stage.

Measures against clogging of the air diffuser element are the biggest problem of the air diffuser, and when this cause is analyzed, the following causes can be cited.
1) The opening of the diffuser element is large, and the backflow of sewage is easily allowed.
2) There is a space between the air diffuser element and its support when the air diffuser is stopped.
3) Water accumulates in the header pipe.
4) Dust contained in the supply air exists.

  Regarding the above 1), in recent years, a diffuser using a rubber membrane that has solved this problem has been developed and put into practical use (Patent Document 1). This is because a slit is made in a thin film rubber, and the rubber expands during aeration to open the slit and generate bubbles, and when the aeration is stopped, the slit is closed to prevent the backflow of sewage. In addition, when the aeration is stopped, the rubber membrane contracts and comes into close contact with the support body of the diffuser element, thereby solving the problem 2) above and preventing the backflow of sewage.

  The above problem 2) is that the air temperature rises when compressing the air supplied to the diffuser, and the air in the diffuser cools to the water temperature of the aeration tank when the aeration is stopped. Pressure is generated, and a back flow of sewage is generated in proportion to the amount of space between the air diffusion element and its support, causing clogging. This is as described in paragraph [0007] of Patent Document 1.

  On the other hand, if there is no space between the diffuser element and its support at the time of aeration, the lower surface of the diffuser element is not at a uniform pressure, and bubbles are generated only from a biased location.

  In this way, intermittent aeration is possible with the rubber membrane type, but in order to form a slit opening at the time of aeration, it is necessary to increase the amount of rubber stretch, and the stress is also great, so the rubber deteriorates over time. Due to this, there is a problem that the elasticity cannot be maintained, and a space is formed between the rubber membrane and its support body even when aeration is stopped after several years.

The problem of 3) above is that the sewage that has flowed back once or the water condensed when the aeration is stopped accumulates in the header pipe and gradually accumulates. Since sewage adheres to the surface, microbial slime adheres to the inside of the diffuser element, causing clogging.
As a countermeasure against this, as shown in FIG. 18, an air lift pipe 3 is inserted into a header pipe 2 disposed inside the aeration tank 1, and this is laid to the surface of the water. 3, there is a method of discharging water accumulated in the header pipe 2. In addition, the number 4 in FIG. 18 shows an aeration apparatus, the number 5 shows a riser pipe, and the number 6 shows a stagnant water. As shown in FIG. 19, the air diffuser 4 includes a header pipe 2, a support member 7 that is integrated with the branch pipe 2 b that communicates with the header pipe 2 and has a check valve 2 a at the upper portion thereof, The rubber frame 8 disposed at the edge, the air diffusion element 9, and the element frame 10 that sandwiches the air diffusion element 9 between the rubber frame 8 are provided.

  However, this method requires manual opening and closing work of the valve installed in the middle of the air lift pipe near the water surface, so there is a problem in maintenance and management, and since the power of the air lift is not strong, it is difficult to reliably drain the drain. It is.

The problem of 4) is that clogging occurs in the supply air due to dust from the discharge air of the compressor and dust due to rust in the piping inside or inside the diffuser element.
As a method for solving this problem, in Patent Document 1, as shown in FIG. 1, a contrivance is made so that supply air containing foreign matter is not directly blown onto the air diffusion element. Moreover, in patent document 2, as shown in FIG. 8, the filter attached to the header pipe | tube is installed. However, in Patent Document 1, dust capture is not reliable, and in the latter case, when the dust capture amount reaches a specified value, there is a problem that a filter replacement operation is required.

Further, even if these measures are taken, clogging gradually occurs, so that it is necessary to replace the diffuser element someday. However, in the full-surface aeration system in which an air diffuser is placed on the entire surface of the bottom of the water tank, which emphasizes oxygen dissolution efficiency, the weight of the air diffuser system is large, and a simple lifting device has not been put to practical use. It was necessary to be.
Since it takes a lot of time and labor to empty the water tank, an invention of a method for lifting an air diffuser that is simple and can be easily restored has been desired.

In Patent Document 3, as shown in paragraphs [0019], [0020], [0030] and FIG. 1, a pair of guide poles on both sides of a header pipe attached with a plurality of aeration devices of the entire surface aeration type , And a device that moves up and down with two wires in total from each side of the header pipe is disclosed. However, the guide pole requires accuracy in the vertical direction, and requires four wires to be simultaneously wound up and down at the same time, which is labor intensive. In particular, if the riser pipe that supplies air from the upper part of the tank to the header pipe is a heavy steel pipe, the header pipe will be tilted and frictional force will be generated between the guide pole and the header pipe guide unless it is lifted and lowered carefully. However, excessive force is required for ascent and machining.
JP 2004-216299 A JP 2005-177551 A JP 2005-103387 A

The present invention has been made to solve the above problems, and provides a diffuser plate that can prevent clogging in a diffuser element that does not stretch or contract, and can maintain oxygen dissolution efficiency regardless of aging. For the purpose.
In addition, the present invention provides a simple and easy-to-operate air diffuser that can easily replace the air diffuser element without stopping operation and emptying the water tank even when clogging occurs. With the goal.

In order to solve the above problems, an air diffuser plate according to the present invention includes an air diffuser element that is not stretchable or contractible, an element frame that fixes a peripheral portion of the upper surface of the air diffuser element, and a lower part of the air diffuser element. A flexible diaphragm provided on the side, with an edge fixed to the edge of the air diffuser element and provided with a vent in the center for allowing ventilation during air supply , and A flexible hose having a shrinkage absorbing portion connected to the vent, and the hose is attached to the upper surface of the outer peripheral portion of the vent so that the upper portion thereof is an annular protrusion. It is characterized by that.

The air diffuser according to the present invention includes the air diffuser plate, a header pipe disposed below the air diffuser plate to supply air to the hose, and a plurality of air diffusers attached to the header pipe. A fixed plate for fixing the element, and a plurality of diffuser elements are connected and fixed.

According to the present invention, it is possible to obtain an air diffuser plate that can prevent clogging in an air diffuser element that does not expand and contract and maintain oxygen dissolution efficiency regardless of changes over time.
Further, according to the present invention, even when clogging occurs, the air diffuser can be easily replaced without stopping the operation and emptying the water tank, and a simple and easy work device is obtained. It is done.

Hereinafter, the present invention will be described in more detail.
A diffuser element having no stretchability or contractibility is used for the diffuser plate of the present invention. Examples of the material of the diffuser element include a mesh cloth, a ceramic, a resin, and a metal sintered body.
It is preferable to fix the periphery of the diffuser element with a strong element frame such as metal or plastic, and fix an impermeable member (diaphragm) to the element frame by pressure bonding, adhesion, or sandwiching. However, if a material made of a ceramic or resin that is a rigid body is used as the material of the diffuser element, the element frame is not necessarily required. Conventionally, the support (holder) of the diffuser element has been made of a rigid material such as metal or plastic. In the present invention, the diaphragm is the support. In general, rubber is used as the material of the diaphragm.

  In the air diffusing plate of the present invention, it is preferable that a film made of a water-impermeable material (for example, rubber) is attached to the air diffusing element portion that is in contact with the vent portion of the diaphragm. Thereby, the backflow of sewage can be prevented when the aeration is stopped.

  In the air diffusing plate of the present invention, when the air is supplied, the diaphragm on the lower surface is bent downward, and a space is formed between the air diffusing element and the vent hole of the diaphragm, so that ventilation is performed. Further, when the aeration is stopped, the diaphragm is subjected to water pressure from the lower side and the bending is eliminated, so that a space between the aeration element and the diaphragm can be eliminated.

  As described above, the air diffuser of the present invention includes the air diffuser plate, a flexible hose connected to a lower portion of the air diffuser plate, a header pipe for supplying air to the hose, and the header. And a fixing plate for fixing the plurality of air diffusion elements attached to the tube, wherein the plurality of air diffusion elements are connected and fixed.

  In such a diffuser, a flexible hose (or pipe) is connected to the lower part of the diffuser, in particular to the vent in the center of the flexible diaphragm. Here, since the diffuser element is supported by a flexible diaphragm, the level of the diffuser element necessary for uniform foaming cannot be obtained in this state. It is preferable to install a metal or plastic rigid body (fixing plate of claim 4) for connecting the element.

  In spite of the above measures, it is assumed that water accumulates in the header pipe due to condensation at the time of stopping aeration in the header pipe, reverse flow of sewage, loose connection, and the like. Therefore, in order to automatically discharge the water in the header pipe, the air diffuser further includes a branch pipe installed in the lower part of the header pipe, and a branch container installed in the branch pipe. It is preferable to include a drain wrap having a child and a discharge port, and a check valve installed on the downstream side of the drain wrap.

  With such a configuration, the water accumulated in the header pipe enters the drain trap, and the float in the drain trap floats with this water. In addition, when there is no water in the drain trap, the discharge port is blocked by a float or a floating body, but the discharge port opens when the float rises, and the water passes through the check valve. To be discharged. The check valve is necessary so that the air in the header pipe is cooled when aeration is stopped and does not flow back when the pressure is lowered due to the water pressure in the water tank.

In the air diffuser according to the present invention, a riser pipe for supplying air to the header pipe from above the water surface, and the riser pipe are installed in the riser pipe, and metal wires are knitted into a knitted shape, which are alternately stacked as a pair. It is preferable to further comprise a combined demister, and capture the dust in the supply air with the demister and drop it together with moisture to the lower part of the demister.
In other words, in order to ensure the prevention of clogging of the diffuser element due to dust contained in the supply air, it is necessary not only to remove dust by the filter around the compressor, but also in front of the diffuser element or in the header pipe. is there. However, if the filter exceeds the specified dust holding amount, the pressure loss increases and clogs, and air cannot be supplied to the diffuser element. For this reason, it is necessary to replace the filter. However, since the inside of the air diffuser or the header pipe is in water, it is necessary to pull the header pipe up to the water once or empty the water tank, which is not preferable in terms of maintenance management.

  Therefore, as described above, if you install a demister (a knitted thin line called a mist eliminator or wire mesh separator knitted in a knitted shape, which is alternately stacked as a set of 2 sheets), dust will be in the air It was found to fall downward in a wet state in the water contained in. In this way, since dust does not accumulate in the demister, pressure loss does not increase, and regular demister steel pipes and cleaning are unnecessary. Moreover, since the water containing this dust accumulates in the bottom part of a header pipe | tube, it can discharge | emit to the water tank side using an automatic drain discharge device.

In the air diffuser according to the present invention, a lifting and lowering rope respectively installed on the upper and lower ends of the both ends of the header pipe, and the both sides of the header pipe in a state where the header pipe is lowered A fixing bracket provided at the bottom of the aeration tank, two fasteners each for lifting and hanging attached to the fastener, the fixing bracket, and a mechanism for lifting these ropes from the top of the aeration tank The header pipe is preferably lifted.
That is, since clogging gradually occurs even if the above-mentioned measures against clogging are taken, it is necessary to replace the air diffuser element after 10 years. Conventionally, the water tank is emptied and the person descends to the bottom of the pond. The element was replaced. Therefore, in the present invention, as described above, by further providing a fastener and four ropes (a fishing rope and a hanging rope), the operation is stopped and the water tank is emptied even when clogging occurs. Therefore, the work of replacing the air diffusion element can be easily and simply performed.

  Specifically, it is possible to lift the header pipe by attaching two ropes to the fasteners installed at the upper portions on both ends of the header pipe and pulling up the two ropes from the upper part of the water tank. In addition to this, a rope is attached to a fastener installed at the lower part of both ends of the header pipe, and a pair of fixing metal fittings having holes (or hooks) are attached to the bottom of the water tank in the vicinity thereof. Pass through the hole (or hook), connect to the rope take-up device at the top of the water tank, take up this hanging rope with the take-up device, and sit on the bottom of the tank to place the header tube in place Install.

  The header pipe and riser pipe have buoyancy in the aquarium, so the relative weight is small and the seating is not good, but if the tension is applied to the hanging rope from the winding device at all times, It will be certain. In the present invention, when the riser pipe is a heavy stainless pipe, even if the header pipe is slightly inclined, it is absorbed by the tension of the rope, and the frictional force that becomes a problem in the guide is not generated, so that the rise and fall can be ensured. Also, if the hoisting rope and the hoisting rope are marked on both sides with a mark indicating the winding distance, paying attention to this and feeding the ropes evenly on both sides will minimize the inclination of the header pipe, ensuring It can be moved up and down.

  The present inventors have investigated the following three preventive measures for preventing clogging that enables intermittent aeration even when the air diffuser element uses a material that does not expand or contract.

1. An air diffuser that eliminates the space between the air diffuser element and its support when the air diffuser stops.
2. A diffuser that automatically discharges water accumulated in the header tube.
3. A diffuser that removes dust contained in the supply air without the need to replace the filter.
In addition, regardless of the above measures, it is predicted that a steel pipe of the diffuser element will be necessary when 10 years have passed, so that this will be facilitated. A diffuser with a simple header pipe lifting mechanism was proposed.

Hereinafter, a specific air diffuser provided with the above-described preventive measures will be described. However, the present invention is not limited to this.
Example 1
An air diffuser using the air diffuser according to the first embodiment of the present invention will be described with reference to FIGS. 1, 2A, 2B, 3A, and 3B. Here, FIG. 1 is a cross-sectional view of the air diffuser, FIG. 2 (A) is a back view of the air diffuser element which is one configuration of the air diffuser, and FIG. 2 (B) is a side view of FIG. 2 (A). 3A is a surface view of the air diffuser element, and FIG. 3B is a side view of the air diffuser element and the diaphragm. In FIG. 1, for the sake of convenience, one diffuser plate is illustrated.

  Reference numeral 11 in the figure is an air diffusion element made of mesh cloth and having no stretchability or contractibility. The diffuser element 11 has a quadrangular shape in FIG. 2A, but may be circular, and a large number of pores are formed except for the pore-occluded portion at the central portion. A water-impermeable material film 12 made of rubber that exhibits a non-return effect by being combined with a vent hole of a diaphragm, which will be described later, is attached to the pore blocking portion by fusing, pasting, or sandwiching. A peripheral portion of the air diffusion element 11 is fixed to an element frame 13 having a strength made of metal or plastic. A flexible rubber diaphragm 15 having a vent hole 14 at the center is disposed below the air diffusion element 11.

  The edge portion of the diaphragm 15 is fixed to the edge portion of the air diffusion element 11 by fusing, bonding, or sandwiching, and further, the end portion of the support 17 that is in part contact with the air supply pipe (header pipe) 16 and the element. The frame 13 is fixed by being sandwiched by bolting or the like. A rubber hose 18 having a shrinkage absorbing portion 18a curved in the middle is attached to the upper portion of the header pipe 16, and one end portion (upper portion) of the hose 18 communicates with the vent hole 14 of the diaphragm 15. Yes. An annular protrusion (check valve) 19 is provided on the upper surface of the outer peripheral portion of the vent hole 14 of the diaphragm 15. The check valve 19 enhances the effect of preventing the backflow of water from the diffuser element 11. FIG. 3C shows a case where the edge of the diaphragm 15 is fixed to the edges of the air diffusion element 11 and the element frame 13 by being sandwiched.

  As shown in FIG. 1, the diffuser plate 20 according to the first embodiment includes a diffuser element 11 that is not stretchable or contractible, and a vent hole 14 that is installed below the diffuser element 11. A flexible diaphragm 15 is provided, and there is no space between the air diffuser element 11 and the diaphragm 15 when the air diffuser is stopped. The air flow resistance of the air diffuser element 11 causes the diaphragm 15 on the lower surface to bend downward and ventilate when air is supplied. It is configured to enable. According to the air diffuser plate 20 having such a configuration, since the air diffuser element 11 having no stretchability or contractibility is used, clogging can be prevented and the oxygen dissolution efficiency can be maintained regardless of secular change.

In addition, the air diffuser according to the first embodiment is connected to the plurality of air diffusers 20, the hose 18 disposed below the air diffuser 20 and communicating with the vent 14 of the diaphragm 15, and the hose 18. A header pipe 16 for supplying air to the hose 18, and a fixing plate (not shown) attached to the header pipe 16 for fixing the plurality of air diffusion elements 11. It is the structure which connected and was fixed.
According to the air diffuser configured as described above, the diaphragm 15 bends downward when air is supplied, and a space is formed between the air diffuser element 11 and the vent hole 14 of the diaphragm 15, so that ventilation is performed. Since 15 receives water pressure from the lower side and the bending is eliminated, the space between the air diffusion element 11 and the diaphragm 15 can be eliminated. In addition, since the water-impermeable material film 12 made of rubber is attached to the diffuser element 11 portion in contact with the vent portion of the diaphragm 15 by fusion or the like, the backflow of sewage can be prevented when the diffuser is stopped. .

(Example 2)
A diffuser according to Embodiment 2 of the present invention will be described with reference to FIGS. 4, 5 </ b> A, 5 </ b> B, 6 </ b> A, 6 </ b> B, 7, and 8. Here, FIG. 4 is an explanatory view of a state in which an air diffuser having a plurality of air diffusers is installed in an aeration tank, FIG. 5 (A) is a plan view of the air diffuser, and FIG. 5 (B) is FIG. 6A is a cross-sectional view of a fixed plate that supports an adjacent diffuser plate, FIG. 6B is a plan view of FIG. 6A, and FIG. 7 is a diffuser element supported. The explanatory view of the support which does is shown. However, the same members as those in FIG. In the second embodiment, the rubber hose 18 is connected to the header pipe 16 having a quadrangular cross section, and the air from the header pipe 16 is branched to each diffuser plate 20.

  As shown in FIG. 5, the air diffusing device 21 has a configuration in which a plurality of air diffusing plates 20 are arranged in pairs vertically and horizontally. Further, as shown in FIG. 5B, a plurality of pipes 22 are branched from the header pipe 16, and these pipes 22 are connected to each diffuser plate 20 via a rubber hose 18. As shown in FIG. 6A, the plurality of diffuser plates 20 are attached to the header pipe 16 with a fixing plate 24 that fixes the diffuser element 11 via a spacer 23. The header tube 16 and the spacer 23 are integrated with the fixing plate 24 by a band 25. As shown in FIGS. 4 and 7, the header pipe 16 is fixed to the bottom of the aeration tank 26 using a header pipe seat 27. However, although the header pipe seating of FIG. 4 has a structure separable from the header pipe, the header pipe seating of FIG. 7 has a structure integrated with the header pipe.

  As shown in FIG. 7, the diffuser element frame 13 that fixes the periphery of the diffuser element 11 is supported by a support (support) 29. Here, the support plate 29 is a member necessary for obtaining the level of the air diffusion element 11 necessary for uniform foaming. The support body 29 includes a presser plate 30 on the header pipe 16, a string-like fastening body 31 having a threaded portion that is wound around the header pipe 16 and penetrates the presser plate 30 and the support plate 29, and the fastening body. The threaded portion 31 is fixed to the header pipe 16 by a plurality of nuts 32 that are screwed onto the upper portion of the presser plate 30 and above and below the support 29. An air supply hose 34 is connected to the header pipe 16 to supply air to the header pipe 16 from above the water surface. In addition, the number 33 in FIG. 7 shows a hose band.

According to the air diffuser 21 of the second embodiment, the operation and effect of the diaphragm 15 at the time of air supply and when the air diffuser is stopped are the same as those of the first embodiment.
In the second embodiment, the case where the support 29 is fixed to the header pipe 31 is described. However, the present invention is not limited to this, and the support 29 is supported on the bottom of the aeration tank 26 as shown in FIG. May be.

(Example 3)
An air diffuser according to a third embodiment of the present invention will be described with reference to FIGS. 9 (A), 9 (B) and FIG. Here, FIG. 9A shows an air diffuser when supplying air, and FIG. 9B shows an air diffuser when stopping supplying air. FIG. 10 is a plan view of a diaphragm pressing frame used in the air diffuser. However, the same members as those in FIG. 1 and FIG.

  A reference numeral 36 in the drawing indicates a diaphragm pressing frame disposed between the diaphragm 15 and the support 29, and its planar shape is as shown in FIG. Excessive expansion of the diaphragm 15 can be suppressed by the presence of the diaphragm pressing frame 36.

  In the air diffuser of FIG. 9, when air is supplied, the diaphragm 15 extends downward, and a space is formed between the air diffuser element 11 and the vent of the diaphragm 15. Further, when the aeration is stopped, the diaphragm 15 receives the lower water pressure and contracts to the original state, so that the space between the aeration element 11 and the diaphragm 15 can be eliminated.

Example 4
A diffuser according to Embodiment 4 of the present invention will be described with reference to FIG. However, the same members as those in FIG. 1 and FIG. In addition, in the air diffuser of Example 4, it is assumed that water accumulates in the header pipe due to condensation at the time of stopping aeration in the header pipe or loosening of the connection portion, despite the measures described above. It was proposed to automatically discharge water with a simple device.

  Reference numeral 41 in the drawing indicates a pipe (riser pipe) that is connected to the upper part of the header pipe 16 and supplies air to the header pipe 16 from above the water surface. A branch pipe 42 is connected to the lower portion of the header pipe 16, and a drain trap 43 and a check valve 44 are sequentially installed in the branch pipe 42. The drain trap 43 includes a container, a float provided in the container, and a discharge port (each not shown). In addition, the number 45 in a figure shows the accumulated water of the bottom part of the header pipe | tube 16. As shown in FIG.

  According to the air diffuser according to the fourth embodiment, the branch pipe 42 is connected to the lower portion of the header pipe 16, and the drain trap 43 and the check valve 44 are sequentially installed in the branch pipe 42. It has the following effects. That is, the water accumulated in the header pipe 16 enters the drain trap 43, and the float in the drain trap 43 floats with this water. In the state where there is no water in the drain trap 43, the discharge port is blocked by the float or the connection body of the float, but the discharge port is opened by the rise of the float, and the water passes through the check valve 44 to the water tank. Discharged. The check valve 44 is necessary so that the air in the header pipe 16 is cooled when aeration is stopped and does not flow back when the pressure is lower than the water pressure in the water tank.

(Example 5)
An air diffuser according to a fifth embodiment of the present invention will be described with reference to FIG. However, the same members as those in FIG. 1 and FIG.
Reference numeral 35 in the figure indicates a demister installed at a connection port between the riser pipe 41 and the header pipe 16. The demister 35 is formed by knitting a thin metal wire called a mist eliminator or a wire mesh separator into a knitted shape, and alternately superposing them as a pair.

  According to the air diffuser of Example 5, due to the presence of the demister 35, the supply air is cooled in water, slightly contains water, is captured together with dust by the demister 35, polymerizes in the demister 35, and finally. Specifically, the dust falls downward with water in it. Accordingly, dust does not accumulate in the demister 35, so that pressure loss does not increase, and periodic demister replacement and cleaning are unnecessary. In addition, the water mixed with dust is discharged out of the system by the automatic drain discharge described above.

(Example 6)
An air diffuser having an elevating mechanism according to Embodiment 6 of the present invention will be described with reference to FIGS. 13, 14 (A), (B), (C), FIGS. 15, 16 and 17. FIG. 13 is an explanatory view of the air diffuser, FIG. 14 (A) is an enlarged front view of the main part of the air diffuser of FIG. 13, and FIG. 14 (B) is an XX arrow view of FIG. 14C is a view taken in the direction of arrows YY in FIG. 14A, FIG. 15 is an explanatory view showing a state where the header pipe is lifted, FIG. 16 is an explanatory view showing a state where the header pipe is suspended, and FIG. The schematic explanatory drawing at the time of lifting a pipe with a rope is shown. The same members as those in FIGS. 1 and 4 are denoted by the same reference numerals, and description thereof is omitted.

  Reference numeral 51 in the figure indicates a header pipe lifting bracket (hereinafter referred to as a fastener) provided at the upper part of both ends of the header pipe 16. Under the header pipe 16 at both ends, header pipe shake preventing waffles 52 are provided. A header pipe hanging fixing bracket (hereinafter simply referred to as a fixing bracket) 53 is disposed at the bottom of the aeration tank 26 when the header pipe 16 is suspended. A hanging pulley 54 and a lifting pulley 55 are respectively provided on the upper part of the aeration tank 26, and rope fixing wackers 56 are provided on these pulleys 54 and 55, respectively.

  The lifting pulley 55 is for winding the lifting rope 57 attached to the fastener 51 at the end of the header pipe 16. The suspension pulley 54 is used to wind up a suspension rope 58 through the bottom 52 of the header pipe 16 and the fixing metal 53 at the bottom of the aeration tank 26. In addition, since buoyancy works at the bottom of the aeration tank 26, the header pipe 16 having a relatively small weight is as shown in FIG. 14B so that the suspension rope 58 is always tensioned from the suspension pulley 54. The header pipe seat 27 is preferably fixed. Although not shown, a rope take-up device for winding the lifting rope 57 and the hanging rope 58 is disposed on the upper part of the aeration tank 26.

  In the air diffuser having such a configuration, when the header pipe 16 is lifted, the lifting rope 57 is wound up by the lifting pulley 55 as shown by an arrow A in FIG. At this time, the hanging rope 58 moves as indicated by an arrow B. Further, when the header pipe 16 is suspended, as shown by an arrow C in FIG. At this time, the lifting rope 57 moves as indicated by an arrow D.

  As shown in FIG. 17, the hoisting rope 57 is actually branched into ropes 57a and 57b on the header pipe side and branched into both ends of a branch pipe 59 connected to both ends of the header pipe 16. Are connected to each other to maintain the horizontality of a large number of diffuser plates 20. On the other hand, the hanging ropes 58 may be connected to the lower portions at both ends of the header pipe 16.

  According to the sixth embodiment, the fasteners 51 are provided at the upper ends of both ends of the header pipe 16, and the anti-blurring wackers 52 are provided at the lower parts. Further, a lifting pulley 55 and a hanging pulley 54 are provided at the upper part of the aeration tank, and further a lifting mechanism provided with a lifting rope 57 and a hanging rope 58 is provided. The provided air diffuser can be lifted and hung with a simple structure.

Table 1 below shows actual sewage treatment using a multi-layer mesh cloth as a diffuser element and a diaphragm as a diffuser holder on the lower surface of the present invention (FIG. 1) and a conventional plastic holder (FIG. 19). The result of the time-dependent change test of oxygen dissolution and pressure loss in a field aeration tank is shown.

  From Table 1, the diffuser of the present invention has almost no change in oxygen dissolution efficiency and pressure loss even after 6 months of use. However, in the conventional diffuser without a diaphragm on the lower surface, the pressure loss increases, It turned out that the efficiency also decreased.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine the component covering different embodiment suitably. Specifically, the element frame, which is one configuration of the diffuser plate, is not necessarily required depending on the material, and a drain trap, a check valve, a demister, an elevating mechanism, and the like can be used in appropriate combination.

FIG. 1 is an explanatory diagram of an air diffuser according to a first embodiment of the present invention. FIG. 2 is an explanatory view of an air diffuser element which is one configuration of the air diffuser of FIG. FIG. 3 is an explanatory view showing the relationship between the air diffuser element and the diaphragm in the air diffuser of FIG. FIG. 4 shows an explanatory diagram when the aeration apparatus according to the second embodiment of the present invention is installed in an aeration tank. FIG. 5 is an explanatory diagram of the air diffuser of FIG. FIG. 6 is an explanatory view of a fixing plate for fixing the air diffusion element which is one configuration of the air diffusion device of FIG. FIG. 7 is a view for explaining a support state of a support body which is one configuration of the air diffuser of FIG. FIG. 8 is a view for explaining a support state of a support different from FIG. FIG. 9 is an explanatory diagram of an air diffuser according to a third embodiment of the present invention. FIG. 10 shows a plan view of a diaphragm pressing frame used in the air diffuser of FIG. FIG. 11 is an explanatory diagram of an air diffuser according to a fourth embodiment of the present invention. FIG. 12 is an explanatory diagram of an air diffuser according to a fifth embodiment of the present invention. FIG. 13 is an explanatory diagram of the air diffuser according to the sixth embodiment. FIG. 14 is an explanatory diagram of a main part of the air diffuser of FIG. FIG. 15 is a diagram for explaining a state in which the header pipe which is one configuration of the air diffuser of FIG. 13 is lifted. FIG. 16 is a diagram for explaining a state in which the header pipe which is one configuration of the air diffuser of FIG. 13 is suspended. FIG. 17 is a view for explaining in more detail the lifting state of the header pipe in the air diffuser of FIG. FIG. 18 is a schematic explanatory diagram of a conventional air diffuser. FIG. 19 is an explanatory diagram of an air diffuser plate which is one configuration of the air diffuser of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Air diffuser element, 12 ... Impervious material film, 13 ... Element frame, 15 ... Diaphragm, 16 ... Header pipe, 18 ... Hose, 20 ... Air diffuser plate, 21 ... Air diffuser, 29 ... Support (support) 41 ... Riser pipe, 35 ... Demister, 36 ... Diaphragm holding frame, 42 ... Branch pipe, 43 ... Drain trap, 44 ... Check valve, 51 ... Header pipe lifting bracket (fastener), 57 ... Lifting rope, 58 ... Rope for hanging.

Claims (8)

A diffuser element that is not stretchable or contractible, an element frame that fixes the periphery of the upper surface of the diffuser element, and is arranged below the diffuser element, and the edge is fixed to the edge of the diffuser element In addition, a flexible diaphragm provided with a vent hole that allows ventilation at the center to supply air, and a flexible contraction part connected to the vent hole of the diaphragm A hose,
A diffuser plate , wherein the hose is attached to an upper surface of an outer peripheral portion of the vent so that an upper portion thereof is an annular protrusion . The diffuser plate according to claim 1 , wherein a water-impermeable material film is provided on a diffuser element portion that is annularly in contact with an upper end portion of the hose to prevent a reverse flow of sewage when the aeration is stopped . The diffuser plate according to claim 1 or 2, a header pipe disposed under the diffuser plate for supplying air to the hose, and a plurality of diffusers attached to the header pipe. An air diffuser comprising: a fixed plate for fixing an air element; and a plurality of air diffuser elements connected and fixed . The air diffuser according to claim 3, wherein a diaphragm pressing frame for suppressing excessive expansion of the diaphragm is installed between the diaphragm and the fixed plate. A branch pipe having a plurality of the diffuser plates, installed at a lower portion of the header pipe, a drain wrap installed in the branch pipe and having a float and a discharge port in the container, and the drain The air diffuser according to claim 3 or 4 , further comprising a check valve installed on the downstream side of the wrap, wherein the water accumulated in the header pipe is automatically discharged. A riser pipe that supplies air to the header pipe from above the water surface, and a demister that is installed in the riser pipe, knitted metal wires in a knitted shape, and alternately stacked as a set of two sheets; 6. The air diffuser according to claim 5 , wherein dust in supply air is captured by a demister and dropped to the lower part of the demister together with moisture. It has a configuration in which a fastener installed on both ends of the header pipe and two ropes attached to the fastener are provided, and the two pipes are lifted from the upper part of the water tank to lift the header pipe. The air diffuser according to any one of claims 3 to 6 . A metal fitting having a hole or a hook attached to the bottom of the aquarium in the vicinity of the fastener and a winding device for winding the rope arranged at the top of the aquarium, and the rope passed through the hole or the hook of the metal fitting The diffuser according to claim 7 , wherein the header pipe is lowered by connecting to the winding device and winding with the winding device.

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