JP4969557B2 - Air diffuser - Google Patents

Description

  The present invention relates to an air diffuser installed below a submerged membrane separator.

  Conventionally, as shown in FIGS. 7 and 8, the immersion membrane separation device 11 is installed in a treatment tank 12 and separates organic sewage 17 (water to be treated) into solid and liquid. The submerged membrane separation device 11 includes a casing 13 whose upper and lower ends are open, and a plurality of flat membrane cartridges 14 housed in the casing 13. The membrane cartridge 14 has a filter plate 15 and a filtration membrane 16 provided on the surface of the filter plate 15.

  By depressurizing the inside of the membrane cartridge 14, sludge in the sewage 17 is captured by the filtration membrane 16, and the permeated water that permeates the filtration membrane 16 and flows into the inside of the membrane cartridge 14 is treated as membrane water. To the outside of the treatment tank 12.

  A diffuser 20 is installed below the submerged membrane separator 11. The air diffuser 20 includes a horizontal main pipe 21 that receives supply of air from the blower 26, and a plurality of branch pipes 22 attached to the main pipe 21. The branch pipe 22 is located below the main pipe 21 and is disposed in a horizontal direction orthogonal to the main pipe 21, and an upper end opening communicates with the main pipe 21 and a lower end opening is a horizontal pipe. And a vertical pipe portion 24 communicating with the portion 23. A plurality of jets 25 for jetting air are formed in the upper part of the horizontal pipe part 23. The upper end of each branch pipe 22 is integrally fixed to the lower part of the main pipe 21 by welding or the like.

  Air supplied from the blower 26 to the main pipe 21 flows into the branch pipe 22 from the main pipe 21, and is ejected from the respective outlets 25 of the branch pipe 22 to become bubbles 28, and rises from below to above the membrane cartridge 14. To do. At this time, since the bubbles 28 rise along the surface of the membrane cartridge 14 due to buoyancy, the surface of the membrane cartridge 14 is washed, and membrane surface deposits (fouling) such as sludge adhering to the surface of the membrane cartridge 14 are removed. Is done.

In addition, the diffuser which has the above main pipes and branch pipes is described in the following patent document 1, for example.
JP 2001-276875 A

  However, in the above conventional type, in the state where the blower 26 is stopped and the air diffuser from the air diffuser 20 is stopped, the residue and sludge in the sewage 17 should enter the branch pipe 22 from the outlet 25. In the case of adhering / depositing, there is a problem that in the operation of cleaning the branch pipe 22 and removing the internal sludge, the sludge removal work in the vertical pipe portion 24 is particularly troublesome.

  Further, since there is no jet 25 corresponding to the region 27 directly above the main pipe 21, there is a problem that the cleaning effect in the region 27 of the membrane cartridge 14 by the bubbles 28 may be reduced.

  It is an object of the present invention to provide an air diffuser capable of easily cleaning a branch pipe and improving the cleaning effect of the submerged membrane separation device in the region directly above the main pipe. Objective.

In order to achieve the above object, the first aspect of the present invention is an air diffuser installed below the submerged membrane separator,
A horizontal main pipe that receives supply of air from an air supply device, and a branch pipe that is detachably attached to the main pipe,
The branch pipe is located below the main pipe and is arranged in a transverse direction intersecting with the main pipe, and the upper end communicates with the lower end of the main pipe so as to be separable and the lower end is the horizontal pipe member. A communication pipe member that communicates with the main body, and a connection member that can be freely fitted to and detached from the outer periphery of the main pipe,
A spout for ejecting air is formed in the horizontal tube member,
The connecting member is provided on the communication pipe member.

  According to this, by removing the connecting member from the outer peripheral portion of the main pipe, the communication pipe member is separated from the main pipe, and the branch pipe can be easily detached from the main pipe. Further, by fitting the connecting member to the outer peripheral portion of the main pipe, the upper end portion of the communication pipe member is joined to the lower end portion of the main pipe, and the branch pipe can be easily attached to the main pipe.

  Thereby, the branch pipe can be removed from the main pipe and easily cleaned. Further, the branch pipe can be easily replaced with an optimally-sized branch pipe according to the shape or size of the submerged membrane separation apparatus, the air supply amount supplied from the air supply apparatus, or the like.

  Further, the air supplied from the air supply device to the main pipe flows from the main pipe through the communicating pipe member of the branch pipe into the horizontal pipe member, and is ejected to the outside from the jet outlet. At this time, a part of the air in the main pipe leaks to the outside through the gap between the outer peripheral portion of the main pipe and the connecting member from the joint part (communication part) between the main pipe and the communication pipe member, and becomes a bubble. Ascending along the outer circumference of the main pipe, it rises from below to above. Thereby, the number of bubbles rising in the region directly above the main pipe is increased, and the cleaning effect of the submerged membrane separation device in the region is improved.

In the second invention, positioning means for positioning the branch pipe with respect to the main pipe is provided.
According to this, when the connecting member is fitted to the outer periphery of the main pipe and the branch pipe is attached to the main pipe, the branch pipe is positioned on the main pipe by the positioning means. Thereby, a branch pipe can be attached to the correct position of the main pipe.

In the third aspect of the present invention, the connection member is formed in an annular shape having a missing part with an upper part missing, and has elasticity.
The connecting member is detachable from the main pipe through the missing portion by expanding and contracting the missing portion.

  According to this, when fitting the connecting member to the outer peripheral portion of the main pipe, the connecting member is deformed by elasticity, the missing portion is enlarged by the main pipe, and when the main pipe passes through the missing portion, the missing portion is reduced. Thereby, the connection member is fitted to the main pipe so as to embrace the main pipe from the outer peripheral side.

In the fourth invention, one engaging portion is provided in the main pipe,
The connecting member is provided with the other engaging portion,
The other engaging part of the connecting member fitted to the outer peripheral part of the main pipe is engaged with one engaging part of the main pipe.

  According to this, it is possible to prevent the connecting member from inadvertently falling off the main pipe by fitting the connecting member to the outer peripheral portion of the main pipe and engaging the other engaging portion with the one engaging portion. it can.

  As described above, according to the present invention, it is possible to remove the branch pipe from the main pipe and easily clean the branch pipe, and it is also possible to easily replace the branch pipe with an optimally-sized branch pipe. it can. Further, the number of bubbles rising in the region directly above the main pipe is increased, and the cleaning effect of the submerged membrane separation device in the region is improved.

A first embodiment of the present invention will be described below with reference to the drawings. In addition, about the same member as the conventional thing mentioned previously, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.
As shown in FIGS. 1 to 4, reference numeral 35 denotes an air diffuser installed below the membrane cartridge 14 of the submerged membrane separator 11. The air diffuser 35 includes a main pipe 37 in a horizontal direction (an example of a lateral direction) that receives supply of air from a blower 36 (an example of an air supply apparatus), and a plurality of branch pipes 38 that are detachably attached to the main pipe 37. And have.

  The main pipe 37 is disposed below the membrane cartridge 14, and the longitudinal direction of the main pipe 37 is the same as the thickness direction of the membrane cartridge 14. The blower 36 and the main pipe 37 are connected via an air supply pipe 39. The branch pipe 38 is located below the main pipe 37 and is disposed in a horizontal direction orthogonal to the main pipe 37, and an upper end opening 41 communicates with the lower end of the main pipe 37 so as to be joined and separated. In addition, the lower end opening 42 has a communication pipe member 43 that communicates with the horizontal pipe member 40, and a connection member 44 that can be fitted and removed on the outer peripheral surface of the main pipe 37.

  The longitudinal direction of the horizontal tube member 40 is the same as the width direction of the membrane cartridge 14, and the horizontal tube member 40 is formed with a plurality of jet ports 50 and 51 for jetting air. Among these, each jet outlet 50 penetrates the upper part of the horizontal tube member 40 in the vertical direction and opens upward, and each jet outlet 51 penetrates both ends of the horizontal pipe member 40 in the horizontal direction and opens. Yes.

  The connection member 44 is a thin cylindrical member (an example of an annular shape) having a missing portion 45 with an upper portion missing, and is formed of an elastic material (for example, a thin metal or plastic). A through hole 46 is formed in the lower portion of the connection member 44, and an upper end portion 43 a of the communication pipe member 43 is inserted into the through hole 46 and is integrally fixed to the connection member 44. The connecting member 44 can be fitted into and removed from the main pipe 37 through the missing portion 45 from below by expanding and contracting the missing portion 45 in the longitudinal direction of the horizontal tube member 40.

  In addition, fitting holes 47 penetrating in the vertical direction are formed at the lower end portions (bottom portions) at a plurality of locations in the longitudinal direction of the main pipe 37. The upper end portion 43 a of the communication pipe member 43 protrudes upward from the inner peripheral surface of the connection member 44, and can be fitted into and removed from the fitting hole 47 from below. The positioning means 48 is configured by the upper end portion 43 a of the communication pipe member 43 and the fitting hole 47, and the branch pipe 38 is positioned with respect to the main pipe 37. As shown in FIG. 3, no seal member is provided between the outer peripheral surface of the upper end portion 43a of the communication pipe member 43 fitted in the fitting hole 47 and the inner peripheral surface of the fitting hole 47, A slight gap 49 is formed. In FIG. 3, the gap 49 is exaggerated and enlarged for easy understanding, but actually, a range of 0.05 mm or more and 2 mm or less is preferable. When the gap 49 is less than 0.05 mm, air does not substantially leak from the gap 49 and the branch pipe 38 cannot be easily attached or detached. On the other hand, if the gap 49 exceeds 2 mm, the positioning error of the branch pipe 38 with respect to the main pipe 37 increases, and the aeration is biased.

  As shown in FIG. 3, both end portions of the connection member 44 in the circumferential direction are located obliquely above the horizontal axis perpendicular to the central axis of the main pipe 37 by a predetermined angle θ. The predetermined angle θ is set, for example, within a range of 5 ° to 60 °.

Hereinafter, the operation of the above configuration will be described.
As shown in FIG. 4, the branch pipe 38 can be removed from the main pipe 37 by pushing down (or pulling down) the branch pipe 38 with respect to the main pipe 37. At this time, the upper end portion 43a of the communication pipe member 43 is removed downward from the fitting hole 47, and the connection member 44 is elastically deformed. As shown by the phantom line in FIG. When the main pipe 37 is pushed and spread and passes through the missing portion 45 relatively from the bottom to the top, the missing portion 45 is reduced as shown by the solid line in FIG. As a result, the connecting member 44 is removed from the outer peripheral surface of the main pipe 37, and the communication pipe member 43 is separated from the main pipe 37, so that the branch pipe 38 can be easily detached from the main pipe 37.

  For example, when the sludge contained in the sewage 17 enters the horizontal pipe member 40 from the outlets 50 and 51 and obstructs the ejection of air, the branch pipe 38 is removed from the main pipe 37 as described above, The branch pipe 38 can be easily cleaned.

  In order to attach the branch pipe 38 to the main pipe 37, the connecting member 44 is fitted on the outer peripheral surface of the main pipe 37, and the upper end portion 43 a of the communication pipe member 43 is fitted into the fitting hole 47 from below. At this time, the connecting member 44 is elastically deformed, the missing portion 45 is pushed and spread by the main pipe 37, and when the main pipe 37 passes through the missing portion 45, the missing portion 45 is reduced. As a result, as shown in FIG. 3, the connecting member 44 is fitted into the main pipe 37 so as to embrace the main pipe 37 from the outer peripheral side, so that the branch pipe 38 can be easily attached to the main pipe 37.

  At this time, since the upper end portion 43 a of the communication pipe member 43 is fitted into the fitting hole 47 as described above, the branch pipe 38 is formed by the positioning means 48 constituted by the upper end portion 43 a of the communication pipe member 43 and the fitting hole 47. Is positioned in the main pipe 37. Thereby, the branch pipe 38 can be attached to the correct position of the main pipe 37.

  The air supplied from the blower 36 through the air supply pipe 39 into the main pipe 37 flows into the upper end opening 41 from the main pipe 37 and flows into the horizontal pipe member 40 through the communication pipe member 43. And it ejects to the exterior from each spout 50,51.

  The air thus ejected becomes a large number of bubbles 28 as shown in FIGS. 1 and 2 and rises in the sewage 17 in the treatment tank 12. At this time, since the bubbles 28 rise along the surface of the membrane cartridge 14 due to buoyancy, the surface of the membrane cartridge 14 is washed, and the film surface adhering matter adhering to the surface of the membrane cartridge 14 is removed.

  At this time, as shown in FIGS. 1 to 3, a part of the air in the main pipe 37 does not flow into the upper end opening 41, and the outer peripheral surface of the upper end 43 a of the communication pipe member 43 fits in the fitting hole 47. The connecting member 44 passes through a minute gap 57 at the boundary portion between the outer peripheral surface of the main pipe 37 and the inner peripheral surface of the connecting member 44 from the gap 49 (joint portion between the main pipe 37 and the communication pipe member 43) with the peripheral surface. Leaks to the outside from both sides, and becomes a bubble 58 that rises from below the main pipe 37 to above the main pipe 37 along the outer periphery of the main pipe 37. As a result, the amount of bubbles 58 rising in the region 27 directly above the main pipe 37 increases, and the cleaning effect of the submerged membrane separation device 11 in the region 27 is improved.

  Further, by setting the angle θ shown in FIG. 3 within the range of 5 ° or more and 60 ° or less, the workability when attaching and detaching the branch pipe 38 is improved. If the angle θ is less than 5 °, the connection member 44 is hardly held in the main pipe 37, so that the branch pipe 38 may fall off the main pipe 37 during the operation of the air diffuser 35. If the angle θ exceeds 60 °, the amount of deformation of the connecting member 44 when attaching / detaching the branch pipe 38 to / from the main pipe 37 becomes excessively large, and the attaching / detaching work becomes difficult, and the connecting member 44 undergoes plastic deformation. There is a possibility of waking up.

  Further, a plurality of types of branch pipes 38 having different sizes (diameters, lengths, etc.) or shapes of the horizontal pipe members 40 or different sizes (diameters), shapes, or the numbers of the jet outlets 50, 51 are prepared. Depending on the size and shape of the membrane separation device 11 or the amount of air supplied from the blower 36, an optimum branch pipe 38 can be selected from a plurality of types of branch pipes 38 and attached to the main pipe 37. Thereby, the diffuser 35 can be made to correspond to various types of submerged membrane separators 11.

  For example, as shown in FIG. 5, a large branch pipe 38 </ b> A in which the diameter of the horizontal pipe member 40 and the diameters of the ejection ports 50 and 51 are enlarged compared to the normal-sized branch pipe 38 is attached to the main pipe 37. Also good. In this case, bubbles 28 larger than the bubbles 28 ejected from the normal-sized branch pipe 38 are ejected from the ejection ports 50 and 51 of the large branch pipe 38A. In FIG. 5, the air diffuser 35 in which the normal-size branch pipe 38 and the large-size branch pipe 38 </ b> A are attached to the main pipe 37 is shown. A small branch pipe having a reduced diameter and a diameter of each of the jet ports 50 and 51 may be attached to the main pipe 37.

  Further, as shown in FIG. 5, a closing member 61 that closes the fitting hole 47 of the main pipe 37 is detachably fitted to the outer peripheral surface of the main pipe 37 at a place where air diffusion is unnecessary. The closing member 61 is the one in which the through hole 46 is not formed in the connecting member 44 of the branch pipe 38, and has the same configuration as the connecting member 44 except for that.

  According to this, by fitting the closing member 61 to the outer peripheral surface of the main pipe 37, the fitting hole 47 of the main pipe 37 is closed by the closing member 61. Thereby, although the slight bubble 58 may leak, the aeration in the location which attached the closure member 61 can be almost eliminated. Note that a sealing member such as packing may be provided on the inner peripheral surface of the closing member 61 in order to reliably prevent the bubbles 58 from leaking out.

Next, a second embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 6, the main pipe 37 is formed with a plurality of engaging hole portions 54 (an example of one engaging portion) that open to the outer peripheral surface. Further, hemispherical engagement protrusions 55 (an example of the other engagement portion) that can be engaged with and disengaged from the engagement hole portion 54 are provided on the inner peripheral surfaces of the one end portion and the other end portion in the circumferential direction of the connection member 44. ) Is formed.

Hereinafter, the operation of the above configuration will be described.
When the branch pipe 38 is attached to the main pipe 37, the connection protrusion 44 of the connection member 44 fitted on the outer peripheral surface of the main pipe 37 is fitted into the engagement hole 54 to engage with each other. Inadvertent dropping from the main pipe 37 can be prevented.

  In each of the above embodiments, the spout 50 is formed by opening upward in the upper portion of the horizontal tube member 40, but may be formed by opening downward in the lower portion of the horizontal tube member 40, or You may form in the upper-lower center part of the horizontal tube member 40 by opening horizontally.

  In each of the above embodiments, the main pipe 37 and the horizontal pipe member 40 of the branch pipe 38 are arranged in the horizontal direction orthogonal to each other, but may be slightly inclined up and down with respect to the horizontal direction. Further, they may intersect at an angle other than orthogonal, that is, 90 °.

  In each of the above embodiments, a part of the air in the main pipe 37 is configured to leak outside through a minute gap 57 between the outer peripheral surface of the main pipe 37 and the inner peripheral surface of the connection member 44. However, an air circulation groove for flowing air is formed on the inner peripheral surface of the connection member 44, and a part of the air in the main pipe 37 is a gap between the upper end portion 43 a of the communication pipe member 43 and the fitting hole 47. 49 may be configured to actively leak from both sides of the connecting member 44 to the outside through the air circulation groove 49. At this time, it is also possible to adjust the width, depth, number, and the like of the air circulation grooves so that the elasticity of the connecting member 44 is suitable for attaching and detaching the branch pipe 38.

It is a perspective view of the air diffusion apparatus in the 1st Embodiment of this invention. It is a partially cutaway front view of the air diffuser. It is a partial expanded sectional view of a diffuser. It is a partial expanded sectional view of a diffuser, and shows the state which removed the branch pipe from the main pipe. FIG. 4 is a perspective view of the air diffuser, showing a state in which branch pipes and closing members having different sizes are attached to the main pipe. It is a partial expanded sectional view of the aeration apparatus in the 2nd Embodiment of this invention. It is a schematic diagram of the conventional aeration apparatus and immersion type membrane separator. It is a figure of the air diffuser and the membrane cartridge of the submerged membrane separator.

Explanation of symbols

11 Submerged membrane separator 35 Air diffuser 36 Blower (air supply device)
37 Main pipe 38 Branch pipe 40 Horizontal pipe member 43 Communication pipe member 44 Connection member 45 Missing part 48 Positioning means 50, 51 Jet port 54 Engagement hole part (one engagement part)
55 Engagement protrusion (the other engagement part)

Claims (4)

A diffuser installed below the submerged membrane separator,
A horizontal main pipe that receives supply of air from an air supply device, and a branch pipe that is detachably attached to the main pipe,
The branch pipe is located below the main pipe and is arranged in a transverse direction intersecting with the main pipe, and the upper end communicates with the lower end of the main pipe so as to be separable and the lower end is the horizontal pipe member. A communication pipe member that communicates with the main body, and a connection member that can be freely fitted to and detached from the outer periphery of the main pipe,
A spout for ejecting air is formed in the horizontal tube member,
An air diffuser characterized in that the connecting member is provided on the communication pipe member. The air diffuser according to claim 1, further comprising positioning means for positioning the branch pipe with respect to the main pipe. The connecting member is formed in an annular shape having a missing part with an upper part missing, and has elasticity,
The diffuser according to claim 1, wherein the connecting member is detachable from the main pipe through the missing portion by expanding and contracting the missing portion. One engagement part is provided in the main pipe,
The connecting member is provided with the other engaging portion,
The other engagement part of the connection member fitted to the outer peripheral part of the main pipe engages with one engagement part of the main pipe, according to any one of claims 1 to 3. Air diffuser.

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