KR20190088617A - Diffuser assembly and wastewater treatment system comprising the diffuser assembly - Google Patents

Abstract

A diffuser assembly according to the present embodiment comprises: a diffuser membrane having fixed bead portions formed along four edges; and a diffuser body including a lower body portion located below the diffuser membrane and having a protruding frame configured to cover a portion of the fixed bead portions. The protruding frame has an inner surface formed to coincide with an outer shape of the covered area of the fixed bead portions, and the protruding frame is integrally formed in the lower body portion.

Description

[0001] DIFFUSER ASSEMBLY AND WASTEWATER TREATMENT SYSTEM COMPRISING THE DIFFUSER ASSEMBLY [0002]

The present invention relates to wastewater treatment, and more particularly to a diffuser assembly for use in wastewater treatment.

Generally, in order to treat polluted sewage, several steps are carried out. Among them, the aeration tank is a structure necessary to sufficiently bring sewage and air into contact with air by blowing air into sewage or spraying water in the air. It functions to promote the digestion by aerobic bacteria and functions to remove carbon dioxide gas, sulfuric gas, and methane gas in the sewage by the digestion of microorganisms.

The diffuser assembly used as a means for supplying air into the sewage is connected to the air supply means to provide fine air bubbles in the sewage, thereby dramatically reducing the oxygen dissolution rate required for microbial growth, thereby improving the self purification ability of sewage .

The diffuser assembly includes a cylindrical tube diffuser and a diffuser membrane configured to cover a portion of the tube diffuser. Placing a tube diffuser on the bottom of the tank and supplying compressed air to the tube diffuser while the tube diffuser is submerged in the wastewater causes air to escape through the punched pores of the diffuser membrane coupled to the tube diffuser.

The fabrication of such tube diffusers and the installation of tube diffusers is a relatively labor intensive task and generally requires skilled labor. If not installed correctly, the bubbles may not be uniformly generated, and the efficiency of the wastewater treatment may be deteriorated, and the wastewater may infiltrate into the pipe for supplying the compressed air, thereby causing contamination of the diffuser and the pipe.

If such a problem occurs, the wastewater treatment tank must be drained to repair the diffuser assembly. Such repairing takes a long time, and a problem arises in that the wastewater treatment tank can not be used during the repairing period.

As a result, a diffuser assembly capable of solving the above-mentioned problems is required.

An embodiment of the present invention is to propose a diffuser assembly having a diffuser membrane which is captured by a diffuser body using a protruding frame so that the flexible diffuser frame is not separated from the rest of the diffuser body. With the above diffuser assembly, the possibility of air leakage becomes considerably low due to easy installation, and it has many advantages compared with the conventional one.

An embodiment of the present invention proposes a diffuser assembly comprising a diffuser membrane and a diffuser body. The diffuser membrane includes a fixed bead along four edges.

And, the diffuser body includes a lower body portion disposed below the diffuser membrane and a protruding frame covering the covered portion of the peripheral edge. The protruding frame is coupled to the lower body part.

The wastewater treatment apparatus of the embodiment of the present invention is intended to solve the above-mentioned conventional problems, and the diffuser assembly is communicated with the inside of the gas distribution pipe, so that the gas / air can move. The gas distribution pipe is supported above the bottom of the wastewater treatment tank.

A further embodiment of the invention relates to a method of manufacturing a diffuser assembly. The diffuser membrane includes a fixed bead portion formed along four edges. The diffuser body is at least partially formed by injection molding, and the diffuser body includes a lower body portion underlying the diffuser membrane. The diffuser body includes a protruding frame to cover the covered portion of the fixed bead. The projecting frame forms an inner surface so as to correspond to the outer shape of the covered portion of the stationary bead. The protruding frame is coupled to the lower body part.

The diffuser assembly according to the present embodiment includes a diffuser membrane having a rectangular shape and having a fixed bead portion having a predetermined thickness along four edges, a projection disposed below the diffuser membrane and configured to cover a portion of the fixed bead portion, Wherein the protruding frame is formed integrally with the diffuser body and the protruding frame is formed to be in close contact with a part of the fixed bead, thereby fixing the position of the fixed bead and the syringe diffuser membrane Role.

According to the embodiments of the present invention, it is easy to install, and leakage of water is prevented at the junction of the diffuser body and the membrane, thereby effectively treating the wastewater.

1 is a partially enlarged perspective view of a diffuser assembly according to an embodiment of the present invention.
2 and 3 are top and bottom views of the diffuser assembly of the present invention.
4 and 5 are cross-sectional views of the diffuser assembly shown in FIG.
Figure 6 is a cross-sectional view of the molding site with respect to the diffuser membrane before thermoplastic resin injection.
7 is a cross-sectional view of the molding part with respect to the diffuser membrane after thermoplastic resin injection.
Figures 8 and 9 are cross-sectional views of the molding part with respect to the diffuser membrane prior to injection molding.
FIGS. 10 and 11 are views showing a section of the molding part with respect to the diffuser membrane after injection molding.
12 is a perspective view showing the diffuser assembly coupled to the gas distribution pipe through the mounting means;
13 is an exploded perspective view of the mounting means shown in Fig.
14 is an exploded perspective view of the components shown in Fig.
15 is a cross-sectional view of the components shown in Fig.
16 is an exploded perspective view of a diffuser assembly having a rectangular gas distribution plate.
17 is a partially cutaway perspective view showing a state of the diffuser assembly of the first embodiment.
18 and 19 are views showing the configuration of the diffuser assembly of the second embodiment.

Hereinafter, the present embodiment will be described in detail with reference to the accompanying drawings. However, the scope of the technical features of the present invention can be defined from the matters disclosed in the present embodiment, and the technical features of the present invention can be applied to the proposed embodiment by adding, deleting, ≪ / RTI >

The suffix "module" and "part" used in the description relating to the present invention are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

1 is a view showing a configuration in which two diffuser assemblies 100 according to an embodiment of the present invention are disposed in a wastewater treatment tank.

A gas distribution pipe 105 for conveying the compressed air to treat the wastewater contained in the wastewater treatment tank 115 is constructed and the diffuser assembly 100 of this embodiment is coupled to the gas distribution pipe 105.

As shown, a pair of diffuser assemblies 100 are arranged to be symmetrical about the gas distribution pipe 105, and these diffuser assemblies 100 are connected to the gas (not shown) through a separate member such as mounting means 110 And can be mounted to the distribution pipe 105.

The diffuser assembly 100 is mounted to communicate with the interior of the gas distribution pipe 105 and the compressed air is transferred to the diffuser assembly 100 via the gas distribution pipe 105.

Reference numeral 12 shown in Fig. 1 indicates that a partial enlargement of the area is shown in Fig.

Hereinafter, the configuration of the diffuser assembly 100 of the present embodiment will be described in more detail.

FIGS. 2 and 3 are an upper perspective view and a lower perspective view of a diffuser assembly according to an embodiment of the present invention, and FIGS. 4 and 5 are sectional views of the diffuser assembly shown in FIG.

The diffuser membrane 130 of the present invention is disposed on the upper surface of the diffuser body 125 as shown in FIGS. 2 and 4, wherein a plurality of pores 140 are formed in the diffuser membrane 130, To be dispersed and discharged into the wastewater treatment tank.

Referring to FIG. 2, the diffuser membrane 130 has a rectangular or rectangular shape as viewed from the top, and fixed beads 135 are formed at each of the four edges to provide a rigid coupling with the diffuser body. do. That is, the diffuser membrane 130 of the present embodiment has fixed beads 135 that are thicker than the center of the membrane at both corners or at all four corners. The stationary bead 135 has a rectangular cross-section with rounded corners (FIG. 4).

The rear / inner region of the diffuser body 125 can be referred to as a lower body portion 145. Since two diffuser bodies 125 are combined to form a cylindrical diffuser, the diffuser body 125 has a cross- And has an arc shape of approximately 180 degrees.

A rib 150 protruding from the lower surface of the body lower part 145 of the diffuser body 125 along the inner circumferential surface of the lower body part 145 is formed on the upper surface of the lower body part 145 of the diffuser body 125, And serves to impart rigidity to the lower portion.

An inlet portion 155 and an arc-shaped tab 160 are formed at both ends of the diffuser body 125 with respect to the longitudinal direction of the diffuser body 125. The diffuser body 125 protrudes a predetermined thickness on the outer circumferential surface of the diffuser body 125, A protruding frame 170 is formed.

The protruding frame 170 is integrally formed with the diffuser body 125 and is not separated from the arc-shaped inner body portion 145.

The protrusion frame 170 of the diffuser body 125 serves to fix the diffuser membrane 130 to the diffuser body 125. That is, since the protruding frame 170 is configured to surround the fixed bead portion 135 of the diffuser membrane 130, the connection between the fixed bead portion 135 and the protruding frame 170 is performed, The coupling between the diffuser body 125 and the diffuser membrane 130 is achieved.

A plurality of slots 175 are formed in the protrusion frame 170, and the slots 175 correspond to holes for exposing a part of the fixed beads 135.

The compressed air moving through the gas distribution pipe through the inlet 155 flows into the diffuser body 125 through the inflow port 155. The inflow port 155 is formed at the end of the diffuser body 125, .

5 is a detailed view showing internal components of the diffuser body 125 in the vicinity of the inlet 155. As shown in FIG.

The inlet 155 includes a first inlet 190 formed in a hollow cylindrical shape and a second inlet 195 formed to communicate with the interior of the first inlet 190. The second inlet portion 195 is communicated with the first inlet portion 190 and the second inlet portion 195 so that air can be moved through the first inlet portion 190 and the second inlet portion 195. The inner circumferential surface of the second inlet portion 195 may be formed as a female thread, And is formed by a manufacturing method to be described later.

In addition, the diffuser body 125 is formed with an inner vertical tube 200 having holes that communicate with the inlet portions (first and second inlet portions). The inner vertical tube 200 is configured to communicate with the first and second inlet portions and the gas / air moving through the first inlet portion can be moved to the inner vertical tube 200 via the second inlet portion .

The inner vertical tube 200 extends to the opening 205 of the diffuser body 125. The opening 205 is formed in the surface of the diffuser body on which the diffuser membrane 130 is disposed. That is, the inner vertical tube 200 corresponds to a hole extending to the lower side of the diffuser membrane 130.

A plug 210 is formed below the inner vertical tube 200 and the plug 210 prevents air from leaking through the bottom of the inner vertical tube 200.

The compressed air entering the inner vertical tube 200 via the inlet 155 is moved to a space between the diffuser membrane 130 and the arc-shaped body lower portion 145. The displaced air is released through the pores 140 of the diffuser membrane 130 to enable treatment of the wastewater through a biological reaction.

The diffuser membrane 130 may be made of an elastomer such as ethylene propylene diene monomer (EPDM), but is not limited thereto. One or both surfaces of the diffuser membrane 130 may be covered with a fluoroelastomer, for example, polytetrafluoroethylene (PTEE) as the fluoroelastomer.

The diffuser membrane 130 may then be coalesced with fluorine. Both PTFE coating and fluorine incorporation have been demonstrated to slow the rate at which the diffuser membrane is contaminated. The diffuser body 125 may include, for example, plastics such as polypropylene, acrylonitrile butadiene styrene (ABS), polyvinyl chloride, and polyoxymethylene.

The diffuser body 125 and the diffuser membrane 130 constituting the diffuser assembly 100 may be manufactured by injection molding the diffuser body 125 around the diffuser membrane 130 using different molding components .

A description will be given of a method of manufacturing a diffuser assembly of the embodiment by melting a thermoplastic material and performing injection molding.

A disassembled cross-sectional view of the molding members relative to the diffuser membrane 130 prior to injection of the thermoplastic material is shown in Fig.

A diagram of the state in which the molding members around the diffuser membrane are disposed after injection of the thermoplastic material is shown in Fig. 8 to 11 are sectional views of the molding members relative to the fixed bead 135 of the diffuser membrane 130. FIG. Figs. 8 and 9 show the state before the injection of the thermoplastic material, and Figs. 10 and 11 show the subsequent figures.

The molding member includes an upper mold 215, a lower mold 220, an inlet insert 225, and an inner vertical tube insert 230.

In the manufacturing process of this embodiment, the injection molding of Figs. 6 to 11 proceeds in the up-down direction of the diffuser membrane 130 in comparison with the directions shown in the previous figures due to the influence of gravity during injection molding.

The inlet insert 225 is ultimately a mold for forming the inlet 155 of the diffuser assembly 100 and the inner vertical tube insert 230 is formed from the inner vertical tube 200 and the plug 210 Is a mold for forming a space occupied by the mold.

During the course of injection molding and injection molding, the fixed beads 135 are supported by the support protrusions 235 of the lower mold 220.

During the injection molding, the molten thermoplastic material is directly filled around the fixed bead 135. [ FIGS. 8 and 10 are views showing that the support protrusions 235 are located in the lower mold 220, and FIGS. 9 and 11 are views showing when the support protrusions 235 are absent.

As shown in these drawings, a support protrusion 235 is formed on the lower mold 220. When the support protrusion 235 is in contact with the fixed bead 135 of the diffuser membrane, Molding is performed to form the protruding frame 170 formed at the outer periphery of the diffuser body 125. [

At this time, the molten thermoplastic material for forming the diffuser body is limited in the area filled by the support protrusions 235, so that the thermoplastic material is not filled in the fixed beads 135 of the diffuser membrane.

Accordingly, when the lower mold 220 is removed after the molding, the support protrusion 235 corresponding to a part of the lower mold 220 is also removed, and the thermoplastic material is fixed to the fixed bead 135 by the support protrusion 235 It is not formed. That is, the slots 175 are formed to expose a part of the fixed bead 135 by the support protrusion 235.

If the support protrusion 235 is not formed in the lower mold 220, the molten thermoplastic material is filled up to the fixed bead 135, so that the entire periphery of the fixed bead 135 is covered with the thermoplastic material So that the slot is not formed.

Once formed, the diffuser assembly according to an embodiment of the present invention may be connected to the gas distribution pipe in a variety of ways. Figs. 12-15 illustrate how to make such a connection using the mounting means 110. Fig.

12 is a perspective view of two diffuser assemblies 110, mounting means 110 and a gas distribution pipe 105, and Fig. 13 is an exploded perspective view of the mounting means 110. Fig. Fig. 14 is an exploded perspective view of the components shown in Fig. 12, and Fig. 15 is a sectional view of Fig.

The mounting means 110 is a saddle device consisting of two hinging means 240 arranged along the gas distribution pipe 105.

The two hinge coupling means 240 are coupled to each other by a wedge 245 and a through hole 250.

The connection nipples 255 formed in the respective mounting means 110 are connected to communicate with the inside of the gas distribution pipe 105. The rubber O-ring 260 allows sealing between the connection nipple 255 and these openings.

The hinge-engaging means 240 includes an arc-shaped receiving portion 265 and the arc-shaped receiving portion 265 receives and combines the arc-shaped tab 160 formed in the diffuser assembly 100 Respectively.

The method of connecting the diffuser assembly 100 to the mounting means 110 inserts the connecting nipple 255 into the inlet 155 of the diffuser assembly 100.

The arc type tab 160 is brought into close contact with the hinge engaging means 240 and then the diffuser assembly is rotated 180 degrees so that the arc type tab 160 is positioned inside the arc type accommodating portion 265 (Fig. 14).

The two additional O-rings 275 on each connecting nipple 255 further tighten the connection nipple 255 and the hollow first inlet 190 inside the inlet 155 of the diffuser assembly 100 .

The compressed air supplied by the gas distribution pipe 105 passes through the connecting nipple 255 and into the inlet 155 and moves to the inner vertical tube 200.

15, the gas discharged from the opening 205 is diffused from the diffuser body 125 to the diffuser membrane 130 and discharged as fine bubbles by the pores 140 of the diffuser membrane 130 .

According to an embodiment, a pore-free region 277 where pores are not formed may be formed in the diffuser membrane 130 at a position where the opening 205 is formed. The pore-free zone 277 allows the diffuser assembly 100 to act as a check-ball, and when the compressed air is shut off, wastewater flows into the diffuser assembly 100 and the gas distribution pipe 105 It is possible to prevent flooding.

When the supply / movement of the compressed air is stopped, the diffuser membrane 130 naturally sinks on the diffuser body 125, and the pore-free region 277 naturally falls down to cover the opening 205 , And the pore-free region 277 closes up that the wastewater eventually flows into the inner vertical tube 200.

The diffuser assembly 100 is a unitary "solid state" diffuser assembly, meaning that no other components are used to attach the diffuser membrane 130 to the diffuser body 125.

This diffuser assembly 100 has several advantages over the prior art. For example, the diffuser assembly 100 may be used as a disposable part in the field. When the diffuser membrane 130 is contaminated, the entire diffuser assembly 100 can be replaced with another new one. This replacement requires only one new part in a simple operation, and the possibility of leakage can be significantly reduced with that single part. In addition, the diffuser body 125 and the diffuser membrane 130 of the embodiment can save material and weight as a part of the cylinder, as compared with the conventional cylinder body.

The embodiments of the present invention described above are merely examples for illustrating the technical idea of the present invention, and other features and combinations may be achieved to implement the described functions.

For example, the mounting means 110 is a convenient means for attaching to a gas distribution pipe in accordance with embodiments of the present invention, but the attachment or coupling of the gas distribution pipe to other components will be variously possible.

For example, FIG. 16 is an exploded perspective view showing joining a diffuser assembly 100 to a gas distribution pipe 280 having a square cross-section. The square-shaped gas distribution pipe 280 includes a pair of screw nipples 285. First, the hollow second inlet portion 195 and the screw nipple 285 are engaged / coupled by being inserted into the inlet portion 155 of the diffuser assembly 100 and rotating the diffuser assembly 100. The O-ring 290 can increase its binding force.

The conventional flexible tube diffuser membrane has a problem that it is somewhat loose when it is joined to the lower support tube. This loose coupling makes the installation very difficult and makes it difficult to achieve a uniform air distribution through the diffuser membrane (especially when the air flow rate is low). And this loose coupling makes it difficult to reduce the pressure loss associated with expanding and penetrating the diffuser membrane. Further, even the life of the diffuser membrane is lowered.

17 is a partially cutaway perspective view of another example diffuser assembly 295 that can reduce breakage in accordance with an embodiment of the present invention.

The first diffuser assembly 295 includes many configurations of the diffuser assembly 100 and includes a diffuser body 300 having an arcuate body lower portion 305 forming the lower side of the diffuser membrane 310.

In the first diffuser assembly 295, the arc-shaped body lower portion 305 has a plurality of ridges 315 (or ripples) positioned under the diffuser membrane 310. These ridges 315 serve to prevent the deformation of the diffuser 315 from occurring, particularly when the supply of compressed air to the first diffuser assembly 295 is cut off, thereby preventing deformation such as folding or lifting of the diffuser membrane .

That is, the ridges 315 serve to keep the diffuser membrane 310 having a smooth surface without being folded by water pressure even if the compressed gas is shut off.

Finally, FIGS. 18 and 19 are views showing the configuration of the diffuser assembly 320 according to another embodiment of the present invention.

Fig. 18 is a plan view, and Fig. 20 is a sectional view. The second diffuser assembly 320 includes a diffuser membrane 330 including a plurality of stationary beads formed along four edges. However, unlike the diffuser assembly 100 described above, the diffuser body 325 located below the diffuser membrane 330 is flat. On the other hand, the second diffuser assembly 320 operates similarly to the diffuser assembly 100 and can be injection molded in a similar manner.

Claims (16)

A diffuser membrane having a rectangular shape and having a fixed bead portion having a predetermined thickness along four edges,
And a diffuser body located below the diffuser membrane and having a protruding frame configured to cover a portion of the fixed bead,
The protruding frame being formed integrally with the diffuser body,
Wherein the protruding frame is formed to be in close contact with a part of the fixed bead, thereby fixing the position of the stationary bead and the diaphragm membrane. The method according to claim 1,
Wherein the diffuser membrane is comprised of an elastomer. The method according to claim 1,
Wherein the diffuser membrane is rectangular in plan view. The method according to claim 1,
Wherein the diffuser membrane has a plurality of pores. The method according to claim 1,
Wherein the stationary bead is configured not to be compressed by the diffuser body. The method according to claim 1,
Wherein the diffuser body is made of a thermoplastic resin. The method according to claim 1,
Wherein the diffuser body has an opening formed below the diffuser membrane. 8. The method of claim 7,
Wherein the diffuser body includes a hollow first inlet portion through which the gas can flow through the opening. 8. The method of claim 7,
Wherein the diffuser body includes a second inlet formed to allow gas to flow through the opening. The method according to claim 1,
Wherein the body lower portion is formed in an arc shape. The method according to claim 1,
Wherein the body lower portion is formed in an arc shape having a curvature in a direction perpendicular to a longitudinal axis of the body lower portion. The method according to claim 1,
Wherein the body lower portion has a flat shape. The method according to claim 1,
The protruding frame including a plurality of slots, each slot configured to expose an outer surface of the stationary bead. The method according to claim 1,
Wherein the covered region of the stationary bead occupies the entirety of the stationary bead. A waste water treatment tank having a bottom surface,
A gas distribution pipe supported by the bottom surface,
And a diffuser assembly for moving gas through the inside of the gas distribution pipe,
The diffuser assembly includes a diffuser membrane having a fixed bead formed along four edges, and a body lower portion positioned below the diffuser membrane, wherein the diffuser body includes a protruding frame configured to cover a portion of the fixed bead portion and,
The projecting frame has an inner surface formed so as to coincide with an outer shape of a covered region of the fixed bead portion,
Wherein the protruding frame is integrally formed on the lower side of the body. 16. The method of claim 15,
Further comprising mounting means including two hinged nipples,
Wherein the nipple causes gas movement to occur between the interior of the gas distribution pipe and the diffuser assembly.

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