JP5031803B2 - Flat membrane element fastening structure - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a fastening structure of flat membrane elements, and in particular, is a flat membrane element constituting a membrane separation device that is immersed in a biological reaction tank for activating organic sewage, and collecting water of adjacent flat membrane elements The present invention relates to a flat membrane element fastening structure that can reliably prevent water leakage from a portion and can be firmly connected by a simple method.

Conventionally, as disclosed in Patent Document 1, an active treatment method using a membrane separation device has been proposed as a method for treating organic sewage such as sewage, industrial wastewater, and domestic wastewater. In the activation treatment using this membrane separation device, the membrane separation device is immersed in a biological reaction tank that activates the wastewater, and the wastewater is activated by aeration and stirring in the air diffuser disposed at the lower position. To do.
In addition, this membrane separation apparatus is a membrane in which a plurality of organic flat membrane type flat membrane elements are arranged and fixed in parallel at predetermined intervals in a predetermined body casing, and the membrane surface is arranged in the vertical direction. The module is constructed and filtered through the filtration membrane of the flat membrane element by suctioning sewage using negative pressure (transmembrane differential pressure) generated in the flat membrane element, and the solid-liquid separation is performed. The water is taken out as treated water.
Then, aeration air is discharged in the form of bubbles from an aeration device disposed below the membrane separation device in the biological reaction tank, a circulating water flow is generated in the sewage in the tank, and the inside of the tank is stirred. The membrane surface of the membrane element is cleaned.

By the way, a plurality of flat membrane elements are arranged so as to be adjacent to each other, and these are fixed by using fasteners such as fastening bolts and nuts to constitute a membrane module. The filtered water is taken out from the section through a drain hose.
However, the membrane surface cleaning gas discharged from the air diffuser floats between the flat membrane elements arranged in parallel as bubbles, thereby cleaning the sludge substance adhering to the membrane surface of each flat membrane element. The levitation force of the surface cleaning gas and the upward flow force of the sewage generated at the same time give vibration to the flat membrane element.
The vibration of the flat membrane element is particularly intense in the upper portion of the flat membrane element, so that the vibration acts particularly locally in the water collecting portion where the flat membrane element is fastened.

  For this reason, since the adjacent water collection parts are fixed by pressure contact or adhesive between adjacent flat membrane elements, this vibration may cause a gap in the pressure contact part of the water collection part or part of the adhesion may be peeled off. When gaps are generated, there is a problem that untreated sewage that has not been subjected to solid-liquid separation flows into the water collecting portion from these gaps.

  In addition, a treated water discharge pipe for discharging treated water filtered on the membrane surface from the flat membrane element is connected to the flat membrane elements arranged in parallel and adjacent at a predetermined interval. For this reason, solid matter adheres to the treated water discharge pipe at the position of the flat membrane element, which suppresses the flow rate of sewage rising between the flat membrane elements and reduces the amount of filtered water permeated by the flat membrane element. There was a problem.

JP 2007-268388 A

  In view of the above-described problems of the conventional flat membrane element, the present invention is a flat membrane element in which a water collecting portion of a flat membrane element is joined in a watertight manner by a simple method and protrusions such as a hose are eliminated. An object of the present invention is to provide a fastening structure.

  In order to achieve the above object, the flat membrane element fastening structure of the present invention is formed by forming a water channel in the connection surface of the water collecting portion disposed so as to project from the side portion of the flat membrane element. In addition, a rib-like structure is formed in which a convex ring is concentrically formed so as to surround the outer periphery of the flow channel, and a convex ring is formed on the other side so as to face a packing fitting groove formed on one side thereof. When the flat membrane elements are adjacent to each other, the flat membrane elements are fastened so that the packing is inserted and sandwiched in the rib-like structure between the adjacent water collecting portions.

  In this case, the packing is a ring shape having a cross-sectional shape that can be watertightly inserted into a packing insertion groove formed in the water collecting portion of the adjacent flat membrane element, and the thickness of the tightening margin is 1 to 3 mm. be able to.

  The packing can be made of an elastic material made of synthetic resin or rubber having a hardness of 50 to 80.

  According to the fastening structure of the flat membrane element of the present invention, the water flow path is formed in the connection surface of the water collecting portion disposed so as to protrude from the side portion of the flat membrane element, and the water flow channel A rib-like structure in which a convex ring is concentrically formed so as to surround the outer periphery of the flat ring element, and a convex ring is formed on the other side so as to face a packing fitting groove formed on one side thereof. When adjacent to each other, even if the flat membrane element vibrates, it is constructed by fastening the flat membrane elements so that the packing is inserted and sandwiched in the rib-like structure between the adjacent water collection portions. Since damage can be prevented and joining between adjacent water collecting portions can be performed in a watertight manner, stable sewage treatment can be performed.

  In addition, by making the packing into a ring shape with a cross-sectional shape that can be water-tightly inserted into a packing insertion groove formed in the water collecting portion of the adjacent flat membrane element, and by setting the thickness of the tightening margin to 1 to 3 mm Even if deformation occurs due to manufacturing errors or temperature changes in the water collecting part, the error or deformation can be absorbed by this tightening margin, and the packing is not broken by strongly pressing between the water collecting parts. Therefore, watertight joining can be performed easily and reliably.

  In addition, by making the packing made of an elastic material made of synthetic resin or rubber having a hardness of 50 to 80, the packing can be easily fitted at the time of joining the flat membrane elements while ensuring that watertight joining can be maintained. Work efficiency can be improved.

It is an expanded sectional view which shows one Example of the fastening structure of the flat membrane element of this invention. It is sectional drawing of packing. The water collection part of a flat membrane element is shown, (A) is a left view, (B) is a front view, (C) is a rear view, (D) is a right view. It is sectional drawing by the AA line of FIG. It is a front view of a flat membrane element.

  Embodiments of a fastening structure for flat membrane elements according to the present invention will be described below with reference to the drawings.

1 to 5 show an embodiment of a fastening structure of a flat membrane element of the present invention.
As shown in FIG. 1, this flat membrane element fastening structure is provided with a water collecting portion 2 so as to protrude from a side portion of a flat membrane element support plate 1 constituting the flat membrane element. On both side connection surfaces of the part 2, the flow channel 3 is formed inside thereof, and the rib-like structure 4 is formed so as to surround the outer periphery of the flow channel 3.
The rib-like structure 4 is formed on one side surface (left side in FIG. 1) of the water collecting portion 2 between the outer ring 44 and the inner ring 31 formed on the outer periphery of the water flow channel 3. A convex ring 41 is formed so as to protrude from the inner peripheral ring 31, and a packing fitting groove 42 that is a concave recess is formed between the convex ring 41 and the inner peripheral ring 31, and these The outer ring 44, the convex ring 41, the packing fitting groove 42, and the inner ring 31 are all arranged concentrically, and also between the outer ring 44 and the inner ring 31 on the other side surface (the right side in FIG. 1). A convex ring 43 is formed on The outer ring 44, the convex ring 43 and the inner ring 31 have the same amount of protrusion, but the position of the convex ring 43 is the concave packing fitting groove of the other adjacent flat membrane element support plate 1. 42 position.
When the flat membrane element is adjacent, the adjacent flat membrane element support plate so that the packing 5 is inserted and sandwiched in the rib-like structure 4 between the adjacent water collecting portions 2 and 2, more specifically, in the packing fitting groove 42. 1 and 1 are configured to be fastened.

The flat membrane element support plate 1 is not particularly limited. For example, as shown in FIG. 5, a flat membrane element support plate 1 in which a filtration membrane is stretched on the outer surface using an ABS resin. An ear piece-shaped water collecting portion 2 is disposed so as to protrude from the side portion of the head.
The water collecting portion 2 of the flat membrane element support plate 1 is an ear piece shape as shown in FIG. 3 manufactured separately from the flat membrane element support plate 1, for example, at a predetermined position of the flat membrane element support plate 1. The membrane element support plate is mounted so as to protrude from the upper part of the membrane element support plate, or is integrally manufactured when the flat membrane element support plate 1 is manufactured.

  Moreover, the water collection part 2 shown in FIG. 3 is manufactured in the shape of an ear piece separately from the flat membrane element support plate 1, and a water flow path 3 through which filtered water is circulated is formed in the center part. The rib-like structure 4 is formed so as to surround the outer periphery of the water flow channel 3 and concentrically with the flowing water channel 3. The rib-like structure 4 is formed so that the water collecting portions 2 of the adjacent flat membrane element support plates 1 are in contact with each other.

The rib-like structure 4 is formed on both the front and back surfaces of the water collecting portion 2, and the front surface and the back surface are different from each other as shown in FIG. When the water collecting portions 2 and 2 are adjacent to each other, the diameters of the convex ring 41 and the convex ring 43 are concentric so that a packing fitting groove 42 is formed between the left and right water collecting portions 2 and 2. The water collecting portion 2 is formed differently on the front and back surfaces.
For example, as shown in FIG. 4, the front end of the convex ring 41 on the outer periphery protrudes from the outer end surface of the inner ring 31 of the water flow channel 3 on one side (the left side in FIG. 4) of the water collecting portion 2. Then, a packing fitting groove 42 which is depressed so as to fit the packing is formed between the outer circumferential convex ring 41 and the inner circumferential ring 31 formed on the outer periphery of the inner circumferential flow channel 3, and the other surface In (on the right side in FIG. 4), the tip end surface of the outer circumferential convex ring 43 and the outer end surface of the inner circumferential ring 31 of the flowing water channel 3 are formed to be flush with each other.

As shown in FIG. 2, the packing 5 is water-tightly inserted into a recessed packing fitting groove 42 formed in a ring shape between the convex ring 41 and the inner ring 31, and is usually synthesized. It is molded using an elastic material such as resin or rubber having a hardness of about 50 to 80.
Thereby, the packing 5 can be easily fitted at the time of joining the flat membrane element support plate 1 while ensuring the watertight joining, and the working efficiency can be improved.
In this case, the ring-shaped packing 5 is formed with a hole 5h having a diameter slightly smaller than the diameter of the inner peripheral ring 31 of the water flow channel 3 at the center, and the cross-sectional shape of the ring portion is the inner surface of the packing fitting groove 42 on one side. Although the shape is the same, the opposite side has a trumpet shape that is slightly wider than the groove width of the packing fitting groove 42.
Further, when the packing 5 is formed in a ring shape, the packing 5 is formed to be slightly larger than the width of the packing fitting groove 42 so that the thickness of the tightening margin is 1 to 3 mm. Thereby, the watertight joining between water collecting parts can be ensured.

  When the flat membrane element support plate 1 shown in FIG. 1 is assembled, a plurality of flat membrane element support plates 1 are arranged adjacent to each other. At this time, the packing 5 is inserted into the packing fitting groove 42 of the water collecting portion 2 in the shape of an ear piece of one adjacent flat membrane element support plate 1. At this time, since the packing made of synthetic resin or rubber is manufactured in consideration of the thickness of the fastening margin of 1 to 3 mm, the packing is fitted into the packing fitting groove 42.

Next, when the other flat membrane element support plate 1 is applied so as to follow the flat membrane element support plate 1 fitted with the packing 5, the tip of the convex ring 43 of the other flat membrane element support plate 1 is applied. The expanded trumpet-shaped piece 51 of the packing 5 is pressed and squeezed into the packing fitting groove 42.
In this manner, the tip surface portion of the packing 5 is pressed and deformed at the tip of the convex ring 43 of the other flat membrane element support plate 1 so that the adjacent water collecting portions 2 and 2 are closely joined to each other. .
Further, since the trumpet-shaped piece 51 in which the packing 5 is expanded is strongly pressed against the inner surface of the packing fitting groove 42, watertight joining is achieved.

Although the adjacent flat membrane element support plate 1 is not particularly limited, for example, a fastening bolt (not shown) is inserted into the water collecting portion 2 of the flat membrane element support plate 1 and the flat membrane element support plate 1 is inserted into this. It can also be integrated by screwing a nut (not shown).
In addition, when fastening the adjacent flat membrane element support plate 1, by using the packing 5 of hardness 50-80, the packing 5 can be easily fitted at the time of joining of the flat membrane element support plate 1, and work efficiency is improved. In addition to being able to improve, watertight joining is reliably maintained without any gap between the adjacent water collecting portions 2 and 2, thereby completely preventing untreated sewage that has not undergone solid-liquid separation from being absorbed. be able to.

  As described above, the fastening structure of the flat membrane element of the present invention has been described based on the embodiments thereof. However, the present invention is not limited to the configurations described in the above embodiments, and may be appropriately selected without departing from the spirit thereof. The configuration can be changed.

  The fastening structure of the flat membrane element of the present invention reliably prevents untreated sewage that has not been subjected to solid-liquid separation from the water collecting portion of the adjacent flat membrane element, and can be connected in a simple manner. Since it has characteristics, it can be suitably used for a membrane separator.

DESCRIPTION OF SYMBOLS 1 Flat membrane element support plate 2 Water collecting part 3 Flow path 31 Inner peripheral ring 4 Rib-like structure 41 Convex ring 42 Packing fitting groove 43 Convex ring 44 Outer ring 5 Packing

Claims (3)

  Convex rings are concentrically formed on the connection surface of the water collecting portion arranged so as to protrude from the side of the flat membrane element, and a flow channel is formed in the inside thereof, and the outer periphery of the flow channel is surrounded. A rib-shaped structure is formed, and a convex ring is formed on the other side so as to face the packing fitting groove formed on one side, and when the flat membrane element is adjacent, a rib-shaped structure between adjacent water collecting parts A flat membrane element fastening structure characterized in that a flat membrane element is fastened between the flat membrane elements by inserting and inserting a packing therein.   The packing has a ring shape with a cross-sectional shape that can be watertightly inserted into a packing fitting insertion groove formed in a water collecting portion of an adjacent flat membrane element, and a tightening thickness is set to 1 to 3 mm. The fastening structure of the flat membrane element of Claim 1.   The fastening structure of a flat membrane element according to claim 1 or 2, wherein the packing is made of an elastic material made of synthetic resin or rubber having a hardness of 50 to 80.

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