JP7675632B2 - Aeration equipment - Google Patents

Description

The present invention relates to an aeration system having a membrane type aeration device that releases air bubbles into a liquid and an air supply pipe that supplies gas to the membrane type aeration device.

Conventionally, this type of aeration equipment includes, for example, a membrane-type aeration device 203 that releases a large number of air bubbles 202 into the water to be treated 201 in a tank 200, and an air supply pipe 208 that supplies air 210 to the membrane-type aeration device 203, as shown in FIG. 22.

The membrane type air diffuser 203 has tubular membranes 204a and 204b, a support tube 205 inserted into the membranes 204a and 204b, and an air supply unit 206.

Each end of the membranes 204a and 204b is fixed watertight to the support tube 205 with a fastener 207 such as a ring-shaped band. The support tube 205 is connected to an air supply tube 208. The air supply unit 206 has an air flow path 209 that connects the air supply tube 208 to the inner circumference of the membranes 204a and 204b and the outer circumference of the support tube 205.

A number of slits 211 are formed in each membrane 204a, 204b to release to the outside the air 210 supplied from the air supply pipe 208 through the air flow passage 209 of the air supply section 206 between the inner circumference of the membranes 204a, 204b and the outer circumference of the support tube 205.

Two membranes 204a and 204b are attached to each support tube 205, and the air supply section 206 is provided between one membrane 204a and the other membrane 204b.

According to this, air 210 is supplied from the air supply pipe 208 through the air flow path 209 of the air supply section 206 to between the inner circumference of the membranes 204a, 204b and the outer circumference of the support pipe 205, causing the membranes 204a, 204b to expand, and the air 210 is released into the treated water 201 as air bubbles 202 from the slits 211 of each membrane 204a, 204b.

The above-mentioned aeration equipment 212 is described, for example, in Patent Document 1 below.

JP2005-81203A

However, in the above conventional system, two membranes 204a, 204b are provided for one support tube 205, so twice as many membranes 204a, 204b are required as there are support tubes 205, which creates a problem in that when assembling the aeration equipment 212, it is time-consuming to attach the membranes 204a, 204b to the support tube 205.

The present invention aims to provide an aeration system that can reduce the labor required for membrane installation.

In order to achieve the above object, the first invention is an aeration system having a membrane type aeration device that emits air bubbles into a liquid and an air supply pipe that supplies gas to the membrane type aeration device,
The membrane type air diffuser includes a membrane formed in a tube shape having a hollow insertion portion, a support inserted into the insertion portion of the membrane, and a gas supply portion,
The membrane has a first sheet member having a plurality of slits formed therein for releasing air bubbles;
a gas flow section is formed between an outer surface of the support and an inner surface of the first sheet member of the membrane;
the gas supply section is provided between both ends of the membrane in a longitudinal direction, and has an air passage communicating from the air supply pipe to the gas flow section;
The membrane, the support, the gas supply unit, and the air supply pipe are connected by a connecting member,
The connecting member has an insertion portion that is inserted into the through holes formed in the membrane, the support, the gas supply section, and the air supply pipe, respectively, a first engagement portion that is provided at one end of the insertion portion and engages with the inner surface of the air supply pipe, and a second engagement portion that is provided at the other end of the insertion portion and engages with the support.

According to this, the gas for diffusion is supplied from inside the air supply pipe through the ventilation passage of the gas supply section to the gas flow section, and is released to the outside through the slits in the first sheet member of the membrane through the gas flow section. This causes a large number of air bubbles to be released from the membrane type air diffuser into the liquid.

The gas supply section is provided between both longitudinal ends of the membrane and has an air passage that connects from the air supply pipe to the gas flow section, so one membrane is provided for one support. This means that only the same number of membranes as the number of supports are required, reducing the effort required for attaching the membranes to the supports when assembling the air diffusion equipment.

In the air diffusion equipment according to the second aspect of the present invention, the membrane has a bag-shaped portion formed into a bag shape by joining a first sheet member and a second sheet member together as a gas flow portion,
The first sheet member constitutes an outer peripheral surface of the bag-shaped portion,
the second sheet member constitutes an inner circumferential surface of the bag-shaped portion,
The ventilation passage of the gas supply portion communicates from the inside of the air supply pipe to the inside of the bag-shaped portion of the membrane.

According to this, the gas for diffusion is supplied from inside the air supply pipe through the ventilation flow path of the gas supply unit to the bag-shaped portion of the membrane, and is released to the outside through the slit in the first sheet member of the membrane through the bag-shaped portion.

In addition, the membrane formed in a tube shape has a bag-like portion, and since the gas is supplied into the bag-like portion of the membrane, there is no need to fix the end of the membrane watertightly to the outer periphery of the support with a fixing device such as a band after inserting the support into the insertion portion of the membrane. This eliminates the need for a fixing device, prevents the membrane from deteriorating and reducing the watertightness at the attachment portion of the fixing device, and prevents leakage of the gas for diffusion.

In addition, because the support is inserted into the insertion portion of the membrane, the support prevents the bag-shaped portion of the membrane from expanding toward the inside of the insertion portion. As a result, even if the bag-shaped portion of the membrane tries to expand toward the inside of the insertion portion, it is prevented by the support, and it mainly expands slightly toward the outside of the insertion portion. This reduces the buoyancy acting on the membrane, and the support that fixes the membrane so that it does not float up can be made smaller, which in turn makes it possible to make the membrane-type air diffuser more compact.

In the third invention, the support of the aeration equipment is a tubular member.

In the fourth aspect of the present invention, the membrane type air diffuser is fixed to the air supply pipe via an adapter,
The adapter is sandwiched between the membrane diffuser and the air supply pipe,
The gas supply is fitted into the adapter.

The air diffusion equipment in the fifth invention has a seal member held in the adapter that simultaneously seals between the adapter and the air supply pipe and between the adapter and the gas supply unit.

With this, a single sealing member can be used to prevent the gas for diffusion from inside the air supply pipe from leaking to the outside through the gap between the adapter and the air supply pipe, and also to prevent the gas for diffusion from inside the air supply pipe from leaking to the outside through the gap between the adapter and the gas supply unit. This allows the number of sealing members to be reduced, leading to cost savings.

In the sixth invention, the air diffusion equipment has an adapter that has a support part that supports the support of the membrane type air diffusion device from below via the membrane.

With this, the support of the membrane type air diffuser is supported by the support part of the adapter, so part of the load of the support is received by the air supply pipe via the adapter. As a result, the load of the support is not concentrated on the gas supply part, but is distributed between the gas supply part and the adapter. This allows the strength of the gas supply part to be reduced, making it smaller and lighter.

In the seventh invention, the air diffusion equipment is a membrane type air diffusion device that intersects with the air supply pipe at the center in the longitudinal direction.

According to this, the gas for diffusion passes through the ventilation flow path of the gas supply section from inside the air supply pipe, is supplied to the gas flow section evenly from the center of the membrane toward both ends, and is released to the outside through the slits in the first sheet member of the membrane through the gas flow section. Therefore, a large number of bubbles are released evenly from the membrane, without being released unevenly in a localized area.

As described above, according to the present invention, the gas supply section is provided between both ends of the membrane in the longitudinal direction, and has an air flow passage that connects from the air supply pipe to the gas flow section, so one membrane is provided for one support. This means that only the same number of membranes as the number of supports are required, which reduces the effort required for attaching the membranes to the supports when assembling the air diffusion equipment.

1 is a perspective view of an air diffusion system according to a first embodiment of the present invention; FIG. 2 is a side view of a membrane type air diffuser provided in the air diffusion equipment according to the first embodiment. FIG. 2 is a cross-sectional view of an end portion of the membrane type air diffuser according to the first embodiment. FIG. 2 is a perspective view of the membrane and the support tube of the membrane type air diffuser of the first embodiment. FIG. 2 is a partially cutaway plan view of the membrane of the membrane type air diffuser of the first embodiment. FIG. 2 is a partially cutaway bottom view of the membrane of the membrane-type air diffuser of the first embodiment. FIG. 4 is a cross-sectional view of a support tube of the membrane type air diffuser according to the first embodiment. FIG. 2 is a cross-sectional view of the connecting portion between the membrane type air diffuser and the air supply pipe of the air diffusion equipment according to the first embodiment. 9 is a view taken along the line XX in FIG. 8 . FIG. 2 is a perspective view of a gas supply nozzle of the membrane type air diffuser according to the first embodiment. 11 is a view taken along the line XX in FIG. 10. 11 is a view taken along the line YY in FIG. 10. FIG. 2 is a partially cutaway plan view of the gas supply nozzle of the membrane type air diffuser according to the first embodiment. FIG. 2 is a partially cutaway bottom view of the gas supply nozzle of the membrane type air diffuser according to the first embodiment. FIG. 2 is a perspective view of the upper side of the adapter of the air diffusion equipment according to the first embodiment. FIG. 2 is a perspective view of the lower side of the adapter of the air diffusion equipment according to the first embodiment. FIG. 13 is a disassembled view of the adapter, air supply pipe, and gas supply nozzle of the aeration equipment. FIG. 2 is a partially enlarged cross-sectional view of the connection between the membrane type air diffuser and the air supply pipe of the air diffusion equipment according to the first embodiment. FIG. 2 is a diagram showing the steps of a method for manufacturing the membrane of the membrane-type air diffuser according to the first embodiment. FIG. 2 is a diagram showing the steps of a method for manufacturing the membrane of the membrane-type air diffuser according to the first embodiment. 11 is a cross-sectional view of a connection portion between a membrane type air diffuser and an air supply pipe of an air diffusion system according to a second embodiment of the present invention. FIG. FIG. 1 is a diagram of a conventional membrane type air diffuser.

The following describes an embodiment of the present invention with reference to the drawings.

(First embodiment)
In the first embodiment, as shown in Fig. 1, reference numeral 1 denotes an aeration system provided in an aerobic tank (not shown) installed in, for example, a sewage treatment plant, etc. The aeration system 1 is immersed in water to be treated 3 (an example of a liquid) consisting of activated sludge in the tank, and includes a plurality of membrane type aeration devices 10 that emit air bubbles 4 into the water to be treated 3, an air supply pipe 12 that supplies air 11 (an example of a gas for diffusing air) to each membrane type aeration device 10, an adapter 14 (see Fig. 8) that fixes the membrane type aeration device 10 to the air supply pipe 12, and a blower 15 that supplies air 11 to the air supply pipe 12 from outside the tank.

As shown in Figures 2 to 6, the membrane type aeration device 10 has a membrane 17 formed in a tubular (cylindrical) shape with a hollow insertion section 16 in the center, a support tube 18 (an example of a support) inserted into the insertion section 16 of the membrane 17, and a gas supply nozzle 19 (an example of a gas supply section).

The membrane 17 has a bag-shaped portion 23 formed by welding two front and back sheet members 21, 22. The front sheet member 21 (an example of a first sheet member) and the back sheet member 22 (an example of a second sheet member) are made of a soft elastic synthetic resin, with the front sheet member 21 forming the outer peripheral surface of the bag-shaped portion 23 and the back sheet member 22 forming the inner peripheral surface of the bag-shaped portion 23.

The bag-shaped portion 23 is an example of a gas flow portion formed between the outer peripheral surface of the support tube 18 and the inner peripheral surface of the sheet member 21 on the front side of the membrane 17.

A circular first opening 24 is formed in the central and upper part of the membrane 17 in the longitudinal direction A. The insertion part 16 penetrates both ends of the membrane 17, and the insertion part 16 communicates with the upper part of the membrane 17 via the first opening 24.

As shown in Figures 8, 9 and 19, a circular first through hole 26 and a second through hole 27 (an example of a through hole) are formed in the central and lower part of the membrane 17 in the longitudinal direction A. Of these, the first through hole 26 is formed in the sheet member 21 on the front side. The second through hole 27 has a smaller diameter than the first through hole 26 and is formed in the sheet member 22 on the back side. The center of the first through hole 26 and the center of the second through hole 27 are coaxial.

As shown in Figures 4 to 6, the two sheet members 21, 22 are welded at the welded portion 29. This welded portion 29 has end welded portions 29a formed around the entire circumference of both ends of the membrane 17, a central welded portion 29b formed around the first opening 24, and a longitudinal welded portion 29c formed between the end welded portions 29a and the central welded portion 29b.

The sheet member 21 on the front side has a number of slits 30 formed therein for releasing the air 11 supplied from the gas supply nozzle 19 into the bag-shaped portion 23 to the outside. As shown by the imaginary lines in FIG. 6, a non-formed area 31 where no slits 30 are formed is provided in the lower part of the sheet member 21 on the front side, and the slits 30 are formed in the area other than the non-formed area 31 and the welded portion 29.

In addition, in drawings such as Figure 2, the slit 30 is drawn as an oval shape to make it easier to see, but in reality, the slit 30 is a slit that is closed when air is not being diffused and is slightly open when air is being diffused.

As shown in Figures 4 and 7, the support tube 18 is a circular resin tube with both ends open, and a circular second opening 33 is formed in the center and upper part of the support tube 18 in the longitudinal direction A. As shown in Figures 8 and 9, when the support tube 18 is inserted into the insertion part 16 of the membrane 17, the position of the first opening 24 of the membrane 17 and the position of the second opening 33 of the support tube 18 are aligned.

As shown in Figure 7, a bolt insertion hole 34 (an example of a through hole) is formed in the center and lower part of the support tube 18 in the longitudinal direction A. As shown in Figures 8 and 9, the position of the bolt insertion hole 34 in the support tube 18 coincides with the center position of the second through hole 27 in the sheet member 22 on the back side of the membrane 17.

As shown in Figures 2, 6, and 8 to 14, the gas supply nozzle 19 is provided in the center of the membrane 17 in the longitudinal direction A, and has a circular tube portion 37, a flange portion 38, and a top plate portion 39. The tube portion 37 is inserted into the first through-hole 26 (see Figure 19) of the sheet member 21 on the front side of the membrane 17, and protrudes below the membrane 17. The lower end of the tube portion 37 is formed with a pair of cutout portions 41 and an inlet port 42 that opens into the air supply pipe 12.

The flange 38 is formed at the upper end of the tube 37 and projects outward in the radial direction of the tube 37, and as shown in Figures 8 and 9, it enters the bag-shaped portion 23 of the membrane 17. The outer peripheral surface of the flange 38 is formed with a plurality of outlet ports 43 that open into the bag-shaped portion 23. The entire periphery of the first through-hole 26 (see Figure 19) of the front sheet member 21 is welded to the underside of the flange 38, thereby attaching the gas supply nozzle 19 to the membrane 17.

The top plate portion 39 is formed at the upper end of the tube portion 37, and a bolt insertion hole 45 (an example of a through hole) that penetrates the top plate portion 39 in the vertical direction is formed.

An air flow passage 46 is formed in the gas supply nozzle 19, which is connected to the inlet 42 and the outlet 43. This allows the inside of the air supply pipe 12 to communicate with the inside of the bag-shaped portion 23 of the membrane 17 via the air flow passage 46 of the gas supply nozzle 19. In addition, a recess 47 curved in an arc shape along the outer circumferential surface of the support tube 18 is formed on the upper surface of the gas supply nozzle 19.

As shown in Figures 8 and 9, the membrane type air diffuser 10 is fixed to the air supply pipe 12 via an adapter 14. As shown in Figures 15 to 17, the adapter 14 has a rectangular parallelepiped adapter body 50 sandwiched between the membrane type air diffuser 10 and the air supply pipe 12, and a pair of support parts 55 that support the support pipe 18 of the membrane type air diffuser 10 from below via the membrane 17. The support parts 55 are provided at both ends of the adapter body 50 in the longitudinal direction A of the membrane type air diffuser 10.

The underside of the adapter body 50 is formed with a recess 52 curved in an arc along the outer circumferential surface of the air supply pipe 12, and an O-ring fitting portion 56. The adapter body 50 is also formed with a circular first fitting hole 53 that penetrates in the vertical direction. The O-ring fitting portion 56 is formed to surround the periphery of the first fitting hole 53.

As shown in FIG. 1, the air supply pipe 12 is disposed below the membrane type air diffuser 10 and is perpendicular to the membrane type air diffuser 10 at the center in the longitudinal direction A of the membrane type air diffuser 10. As shown in FIG. 17, the upper end of the air supply pipe 12 is formed with a plurality of circular second insertion holes 54 (an example of a through hole) that penetrate the air supply pipe 12 from the inside to the outside.

The position of the first fitting hole 53 of the adapter 14 coincides with the position of the second fitting hole 54 of the air supply pipe 12. As shown in Figures 8, 9, and 17, the cylindrical portion 37 of the gas supply nozzle 19 is fitted from above into the first fitting hole 53 of the adapter 14 and the second fitting hole 54 of the air supply pipe 12, and the lower end protrudes into the air supply pipe 12 through the second fitting hole 54.

As shown in Figures 8, 9, 17, and 18, an O-ring 62 (an example of a sealing member) that simultaneously seals between the underside of the adapter 14 and the outer circumferential surface of the air supply pipe 12 and between the inner circumferential surface of the first fitting hole 53 of the adapter 14 and the outer circumferential surface of the tubular portion 37 of the gas supply nozzle 19 is fitted into the O-ring fitting portion 56 and held by the adapter 14.

As shown in Figures 8 and 9, the air supply pipe 12, the adapter 14, the membrane 17, the support pipe 18, and the gas supply nozzle 19 are connected by a connecting member 51. The connecting member 51 has a T-head bolt 57 and a nut 58.

The T-head bolt 57 has a bolt body 57a (an example of an insertion portion) and a head 57b (an example of a first engagement portion) provided at one end of the bolt body 57a. The bolt body 57a is inserted from below through the second insertion hole 54 (an example of a through hole) of the air supply pipe 12, the bolt insertion hole 45 (an example of a through hole) of the gas supply nozzle 19, the second through hole 27 (an example of a through hole) of the sheet member 22 on the back side of the membrane 17, and the bolt insertion hole 34 of the support pipe 18, and protrudes into the support pipe 18.

The head 57b is fitted from below into both notches 41 of the tube portion 37 of the gas supply nozzle 19 and engages with the inner surface of the upper end of the air supply pipe 12.

The nut 58 is an example of a second engagement portion, and is screwed onto the other end of the bolt body portion 57a inside the support tube 18 and engages with the inner surface of the support tube 18.

The entire periphery of the second through hole 27 of the back sheet member 22 is sandwiched between the outer circumferential surface of the support tube 18 and the top plate portion 39 of the gas supply nozzle 19. A cylindrical packing 60 made of an elastic material such as rubber is fitted into the bolt insertion hole 34 of the support tube 18. This prevents a portion of the air 11 supplied from the inside of the air supply tube 12 through the ventilation flow path 46 of the gas supply nozzle 19 into the bag-shaped portion 23 of the membrane 17 from leaking into the support tube 18 from between the bolt insertion hole 34 and the bolt main body portion 57a.

The operation of the above configuration is explained below.

As shown in Figures 1, 8 and 9, by driving the blower 15, air 11 is supplied from the blower 15 into the air supply pipe 12, and the air 11 in the air supply pipe 12 flows from the inlet 42 of the gas supply nozzle 19 through the air flow path 46 and into the bag-shaped portion 23 of the membrane 17 through the outlet 43. This causes the bag-shaped portion 23 to expand, and the air 11 in the bag-shaped portion 23 is released to the outside through the slits 30 in the front sheet member 21, so that a large number of air bubbles 4 are released from the membrane type air diffuser 10 into the water to be treated 3.

The gas supply nozzle 19 is provided between both ends of the membrane 17 in the longitudinal direction A, and has an air flow path 46 that connects from the air supply pipe 12 to the bag-shaped portion 23 of the membrane 17. Therefore, one membrane 17 is provided for one support pipe 18. As a result, the same number of membranes 17 as the number of support pipes 18 are required, and the labor required for attaching the membranes 17 to the support pipes 18 can be reduced when assembling the aeration equipment 1.

In addition, the membrane 17 formed in a tube shape as described above has a bag-shaped portion 23, and since air 11 is supplied into the bag-shaped portion 23, there is no need to fix the end of the membrane 17 watertightly to the outer periphery of the support tube 18 with a fixing device such as a band after inserting the support tube 18 into the insertion portion 16 of the membrane 17. This eliminates the need for a fixing device, prevents the membrane 17 from deteriorating and reducing the watertightness at the attachment portion of the fixing device, and prevents leakage of air 11.

In addition, since the support tube 18 is inserted into the insertion portion 16 of the membrane 17, the support tube 18 restricts the bag-shaped portion 23 of the membrane 17 from expanding toward the inside of the insertion portion 16 (i.e., the center in the radial direction of the support tube 18). As a result, even if the bag-shaped portion 23 of the membrane 17 tries to expand toward the inside of the insertion portion 16, it is prevented by the support tube 18, and after being prevented by the support tube 18, it mainly expands only toward the outside of the insertion portion 16 (i.e., the outside in the radial direction of the support tube 18). As a result, the buoyancy acting on the membrane 17 is reduced, and the stand (not shown) to which the air supply pipe 12 is fixed can be made smaller, simpler, or more simplified to prevent the membrane type air diffuser 10 from floating up.

As shown in FIG. 1, the membrane type air diffuser 10 is perpendicular to the air supply pipe 12 at the center in the longitudinal direction A, so that the air 11 is supplied uniformly from the center of the membrane 17 to both ends through the air flow passage 46 of the gas supply nozzle 19 into the bag-shaped portion 23. Therefore, a large number of air bubbles 4 are released uniformly from the membrane 17, without being released locally and unevenly.

In addition, since the air supply pipe 12 is located below the membrane type aeration device 10, a large number of air bubbles 4 are released into the treated water 3 through the slits 30 of the membrane type aeration device 10 without being blocked by the air supply pipe 12.

As shown in Figures 8, 9 and 18, a single O-ring 62 can be used to prevent air 11 from leaking from the air supply pipe 12 to the outside through the gap between the bottom surface of the adapter 14 and the outer circumferential surface of the air supply pipe 12, and can also prevent air 11 from leaking from the air supply pipe 12 to the outside through the gap between the inner circumferential surface of the first fitting hole 53 of the adapter 14 and the outer circumferential surface of the tubular portion 37 of the gas supply nozzle 19. This allows the number of O-rings 62 to be reduced, leading to cost savings.

As shown in Figures 8 and 15, the support tube 18 of the membrane type air diffuser 10 is supported from below by the support part 55 of the adapter 14, so that part of the load of the support tube 18 is received by the air supply tube 12 via the adapter 14. As a result, the load of the support tube 18 is not concentrated on the flange part 38 of the gas supply nozzle 19, but is distributed between the flange part 38 of the gas supply nozzle 19 and the support part 55 of the adapter 14. This allows the strength of the gas supply nozzle 19 to be reduced, making the gas supply nozzle 19 smaller and lighter.

The manufacturing method of the membrane 17 of the membrane type aeration device 10 is described below.

First, as shown in FIG. 19, the tube portion 37 of the gas supply nozzle 19 is inserted into the first through-hole 26 of the front sheet member 21, which has multiple slits 30 formed therein, and the peripheral portion of the first through-hole 26 is welded to the underside of the flange portion 38 of the gas supply nozzle 19, thereby attaching the gas supply nozzle 19 to the front sheet member 21.

Then, as shown in FIG. 20, the outer edge 65 (see FIG. 19) of the front sheet member 21 and the outer edge 66 (see FIG. 19) of the back sheet member 22 are welded together to form a rectangular membrane sheet 67 having a bag-shaped portion 23. Note that the dotted area in FIG. 20 is the welded portion 29 between the front sheet member 21 and the back sheet member 22.

Thereafter, as shown in FIG. 20, opposing long sides 68 of the membrane sheet 67 are joined together to form a tube, thereby forming the membrane 17 having a bag-shaped portion 23 therein, an insertion portion 16 in the center, a first opening 24 at the top, and a gas supply nozzle 19 at the bottom, as shown in FIG. 4.
In the above first embodiment, a front sheet member 21 and a back sheet member 22 of approximately the same shape are used to form a tubular membrane 17, but the front sheet member 21 may be welded to the back sheet member 22 only in the necessary area to form a bag-shaped portion 23, or the back sheet member 22 may be welded to the front sheet member 21 only in the necessary area to form a bag-shaped portion 23.

Second Embodiment
In the first embodiment described above, as shown in Figure 8, the membrane 17 has a front sheet member 21 and a back sheet member 22, but in the second embodiment described below, as shown in Figure 21, the membrane 17 only has a front sheet member 21 in which a number of slits 30 are formed, and does not have a back sheet member 22.

In addition, both ends of the membrane 17 in the longitudinal direction A are watertightly fixed to the outer periphery of the support tube 18 with fasteners such as bands (not shown).

In addition, a gas flow section 80 is formed between the outer circumferential surface of the support tube 18 and the inner circumferential surface of the sheet member 21 of the membrane 17. The flange 38 of the gas supply nozzle 19 fits into the gas flow section 80. The outlet port 43 opens into the gas flow section 80. As a result, the inside of the air supply pipe 12 and the inside of the gas flow section 80 communicate with each other via the air passage 46 of the gas supply nozzle 19.
According to this, the air 11 in the air supply pipe 12 passes through the air flow passage 46 from the inlet 42 of the gas supply nozzle 19 and flows into the gas flow section 80 from the outlet 43. This causes the sheet member 21 of the membrane 17 to expand, and the air 11 in the gas flow section 80 is released to the outside from the slits 30, so that a large number of air bubbles 4 are released from the membrane type aeration device 10 into the water 3 to be treated.

In each of the above embodiments, air 11 is used as the gas for diffusion, but gases other than air 11 may also be used.

1 Aeration equipment 3 Water to be treated (liquid)
4 Air bubbles 10 Membrane type air diffuser 11 Air (gas)
12 Air supply pipe 14 Adapter 16 Insertion part 17 Membrane 18 Support pipe (support)
19 Gas supply nozzle (gas supply section)
21 Front sheet member (first sheet member)
22 Back sheet member (second sheet member)
23 Bag-shaped portion (gas flow portion)
27 Second through hole (through hole)
30 Slit 34 Bolt insertion hole (through hole)
45 Bolt insertion hole (through hole)
46: Air flow passage 51: Connection member 54: Second fitting hole (through hole)
55 Support portion 57a Bolt body portion (insertion portion)
57b Head (first engaging part)
58 Nut (second engagement portion)
62 O-ring (sealing member)
80 Gas flow section A Longitudinal direction

Claims (7)

An aeration system having a membrane type aeration device that releases air bubbles into a liquid and an air supply pipe that supplies gas to the membrane type aeration device,
The membrane type air diffuser includes a membrane formed in a tube shape having a hollow insertion portion, a support inserted into the insertion portion of the membrane, and a gas supply portion,
The membrane has a first sheet member having a plurality of slits formed therein for releasing air bubbles;
a gas flow section is formed between an outer surface of the support and an inner surface of the first sheet member of the membrane;
the gas supply section is provided between both ends of the membrane in a longitudinal direction, and has an air passage communicating from the air supply pipe to the gas flow section;
The membrane, the support, the gas supply unit, and the air supply pipe are connected by a connecting member,
The connecting member is an aeration equipment characterized in that it has an insertion portion that is inserted into through holes formed in the membrane, the support body, the gas supply unit, and the air supply pipe, respectively, a first engagement portion that is provided at one end of the insertion portion and engages with the inner surface of the air supply pipe, and a second engagement portion that is provided at the other end of the insertion portion and engages with the support body. The membrane has a bag-shaped portion formed into a bag shape by a first sheet member and a second sheet member joined to each other as a gas flow portion,
The first sheet member constitutes an outer peripheral surface of the bag-shaped portion,
the second sheet member constitutes an inner circumferential surface of the bag-shaped portion,
2. The air diffusion system according to claim 1, wherein the air flow passage of the gas supply unit communicates from the inside of the air supply pipe to the inside of the bag-shaped portion of the membrane. The aeration equipment according to claim 1 or 2, characterized in that the support is a tubular member. The membrane type aeration device is fixed to the air intake pipe via an adapter,
The adapter is sandwiched between the membrane diffuser and the air supply pipe,
4. The air diffusion system according to claim 1, wherein the gas supply unit is fitted into the adapter. The air diffusion equipment according to claim 4, characterized in that a sealing member is held in the adapter to simultaneously seal between the adapter and the air supply pipe and between the adapter and the gas supply unit. The air diffusion equipment according to claim 4 or 5, characterized in that the adapter has a support part that supports the support of the membrane type air diffusion device from below via the membrane. The air diffusion equipment according to any one of claims 1 to 6, characterized in that the membrane type air diffusion device intersects with the air supply pipe at the center in the longitudinal direction.

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