WO1991016125A1

WO1991016125A1 - Device for aerating liquids

Info

Publication number: WO1991016125A1
Application number: PCT/EP1991/000740
Authority: WO
Inventors: Karl Heinz SCHÜSSLER
Original assignee: Schuessler Karl Heinz
Priority date: 1990-04-20
Filing date: 1991-04-18
Publication date: 1991-10-31
Also published as: DE4012631A1; DE9114013U1; AU7745091A

Abstract

The invention relates to a device for aerating liquids, especially waste water, by means of a gas distributor (7) to be arranged beneath the surface of the liquid and connectable to a gas supply device, having at least one diaphragm-like wall (4) of flexible material with a plurality of gas outlet apertures. The special feature of this aeration device according to the invention is that the wall takes the form of an unsupported bladder which is maintained only by means of a gas supply stub (2) and is closed as far as at least one gas supply aperture and the gas outlet apertures.

Description

Device for gassing liquids

Description:

The invention relates to a device for gassing liquids, in particular for aerating waste water, by means of a gas distributor to be arranged under the liquid level and connectable to a gas supply device, which has at least one membrane-like wall made of flexible material with a plurality of gas outlet openings.

Such a device for fine-bubble aeration of waste water is known from DE-OS 2 261 994. An air hose consisting of elastic material, connected at one end to an air supply line and closed at the other end with an unperforated underside and with a plurality of air outlet openings is provided, the air hose being held at its longitudinal edges by a support member and in a membrane under the tension of an air cushion is arranged on the air hose, which membrane forms the air channel connected to the air supply line and delimits it. The two hose Walls are connected to each other at the two longitudinal edges by a weld seam and each form a loop which encloses one of the two strand-shaped support members. The membrane, which is under the tension of an air cushion, is also welded to the two tube walls on its two side edges. The air hose is also supported on its two side edges by a sheet steel profile which covers the weld seams and is intended to prevent their peeling. The sheet steel profile is intended to increase the rigidity and weight of the air hose; it can also be provided on the underside of the air hose, the weight expediently being somewhat larger than the buoyancy of the hose filled with air. This known ventilation device is structurally complex and therefore expensive.

From DE-PS 507 294 a device for aerating liquids through air jet pipe systems is known, wherein perforated metallic or made of other suitable material air supply pipes are surrounded by rubber sleeves, which have fine punctures that are only under the pressure of the air introduced into the jet pipe system open. This is intended to achieve the possibility of fine ventilation and the creation of a valve effect which occurs when the air flow is switched off. For the rubber sleeves, a special effort is also required here to support them, namely the entire jet pipe system. In addition, the replacement of worn or defective rubber sleeves is very complex.

A special support structure for the membrane is also considered necessary according to the proposal of DE-PS 34 10 267. In this known fumigation device, a basic body provided, which has at least one inlet for the gas. The membrane covers the base body and is attached to it. A device for limiting the stroke of the membrane is also attached to the base body. The inlet for the gas is passed through the base body as a passage opening. The limiting device consists of a connection which is attached to the membrane at one end in the area of overlap of the passage opening and which cooperates at its other end with a counterpart arranged in the area of the passage opening. Here too, therefore, many parts to be assembled with one another are required, which make the gassing device more expensive in terms of time and material expenditure.

Proceeding from this, it is an object of the present invention to eliminate the disadvantages mentioned and, in particular, to provide a gassing device which, with the same or better functionality, can be assembled more easily and with less material and can therefore be produced and maintained more cost-effectively.

According to the invention, this object is essentially achieved in that the wall is designed as a support-free bubble which is held only by at least one gas supply nozzle and is closed except for at least one gas supply opening and the gas outlet openings.

The solution according to the invention therefore does not require any internal or external supporting structure. In principle, the gas distributor only needs to consist of the bladder itself. The bladder can be kept dimensionally stable even with a small amount of gas.

In a particularly advantageous embodiment of the invention, the gas outlet openings are essentially over the entire Surface of the bladder, preferably evenly, distributed to ensure a uniform gas supply in the liquid.

The bubble preferably assumes a predetermined shape under gas pressure, preferably essentially the shape of a sphere, a flattened sphere or a horizontally lying ring, as a result of which an even gas distribution in the liquid can be achieved. In the case of the ring lying horizontally, it is particularly advantageous that when the gas is acted upon, a downward flow of the liquid is achieved in the center of the ring, which effects a good gas exchange or a good gas enrichment.

However, it is also possible to keep the bladder wall in a predetermined shape by means of horizontal and / or vertical rib-shaped thickenings, so that the application of gas during downtimes is not absolutely necessary.

According to a further feature of the invention, the effective opening cross section of the gas outlet openings is different in size in adaptation to the liquid pressure to be overcome by the gas emerging through the gas outlet openings. For example To achieve a uniform gas outlet over an entire spherical membrane surface, the opening cross section of the gas outlet openings in the bubble wall decreases from bottom to top to the extent that the liquid pressure decreases from bottom to top depending on the vertical height of the bubble.

A uniform gas outlet can also be promoted in that the bubble wall has different thicknesses in adaptation to the liquid pressure to be overcome by the gas escaping through the gas outlet openings. For this For example, the bladder wall in the lower area of the bladder has a smaller thickness than in the upper area, so that the gas passage through the gas outlet openings in the lower area of the bladder is opposed to a lower flow resistance than in the upper bladder area, so that the whole of it ¬ escaping gas pressure to be overcome is approximately the same.

The bladder wall can consist of a stretchable, for example rubber-elastic material which assumes the desired shape and size under the pressurization required for the gassing.

However, it is also possible for the bladder wall to consist of a non-stretchable, for example textile material. In this case, the size and shape of the bladder pressure is fixed independently of the pressure above a minimum pressure of the gas.

However, it is also possible if the textile material allows a certain stretch, i.e. to combine the properties of a stretchable material with those of a non-stretch material. This can be achieved in particular in that the bladder wall consists of textile material or has a textile reinforcement insert or overlay.

It is also within the scope of the invention if the gas outlet openings are made of stretchable material in the prestressed bladder wall. In this case, the gas outlet openings are closed without pressurization, while they only open when a minimum pressure of the gas is applied. Within a certain pressure, the opening cross section of the gas outlet openings is pressure-dependent and can be adjusted accordingly. If a pressure-independent opening cross section of the gas outlet openings is desired, these are preferably introduced into the non-prestressed bladder wall. You then have before and during the gas application regardless of the pressure in essentially the same opening cross-section.

Another feature of the invention is that the gas outlet openings block one from the inside out, i.e. have a radially increasing opening cross-section, i.e. are conical. This has the advantage that when the gas exits the bladder, any dirt deposits are easily entrained from the gas outlet openings, thereby reducing the risk of blockages even of relatively small gas outlet openings. Such gas outlet openings are introduced, for example, in the form of perforations from the outside into the bladder wall by needle pricks.

A particularly simple assembly is possible if the bladder with its gas supply nozzle is placed on a pipe socket of the gas supply device. Such a bladder can also be easily replaced if it is defective. For safety, the gas supply connection can be fastened to the pipe connection by means of a clamp, so that even larger pressurizations can be handled.

In another embodiment, the bladder has a gas supply nozzle with a bead which can be snapped into a gas supply opening of the gas supply device. This also allows a relatively easy assembly and disassembly of the bladder. Here, too, the gas supply nozzle with the bead can be formed in one piece with the bubble, which is also in one piece. 1-

However, it is also possible for the bladder to consist of several parts, that is to say a plurality of wall sections which are vulcanized together, welded together and / or glued to one another, sewn together and / or by means of e.g. of an annular shaping element, zipper or the like are connected to one another.

In order to counteract the buoyancy of the gassing device when the bladder is full, the invention proposes that the bladder surrounds a ballast weight at a distance. The ballast weight can be formed as a hollow body made of rigid or flexible material, the interior of which is in flow connection with the liquid surrounding the bladder and / or can be filled with a liquid such as water, concrete, lead or the like as a ballast weight. However, the ballast weight can also be arranged outside the bladder.

In the pipe socket and / or the gas supply opening, a e.g. Check valve designed as a flap or ball valve, which prevents the liquid from penetrating into the pipe socket or the pipe system of the gas supply device when the pressure drops.

Further objectives, features, advantages and possible uses of the present invention result from the following description of exemplary embodiments with reference to the drawing. All of the described and / or illustrated features, alone or in any meaningful combination, form the subject matter of the invention, regardless of their summary in the claims or their relationship.

Show it: Fig. 1 shows a gassing device having the invention according to a first embodiment of the invention schematically in section, and

2 to 7 further embodiments of the invention in a similar sectional view as in Fig. 1st

The device for gassing liquids shown in FIG. 1 consists of a gas distributor designed as a bladder 4, which is arranged below the liquid level and can be connected to a gas supply device 7. The gas supply device 7 has a pipeline 15, from which one or more pipe sockets 6 branch off at a gas supply opening 9. The bladder 4 has a diaphragm-like bladder wall 5 made of flexible material with a large number of gas outlet openings 1, which are distributed substantially uniformly over the entire membrane surface (only a section is shown). The bladder 4 is, at least in the pressurized state, spherical and support-free only by way of its gas supply connection 2, which is placed over the pipe connection 6 and fixed by means of a clamp 12. The pipe connection 6 is located in front of the gas supply opening 3 in the bubble wall 5, a check valve 14 designed as a ball valve, which opens when the gas pressure is applied and closes when the pressure drops, so that no liquid can get into the bubble 4 and the gas supply device 7 via the gas outlet openings 1.

The embodiment according to FIG. 2 differs from that shown in FIG. 1 essentially in that the gas supply connection 2 adjoining the gas supply opening 3 of the bladder wall 5 is designed as a bulge 8 which can be buttoned into the gas supply opening 9 of the pipeline 15. The embodiment according to FIG. 3 differs from that shown in FIG. 2 essentially in that the bladder 4 is not manufactured in one piece, but consists of an upper and a lower half of the bladder, which are connected to one another via their ring flanges 13 facing each other are connected. The connection can consist of vulcanizing, welding, gluing, sewing together or the like.

The embodiment shown in FIG. 4 has a bladder 4, which according to FIG. 3 consists of an upper half and a lower half. The bladder wall 5, however, surrounds at a distance a ballast weight 11 which is designed as a hollow body, the interior of which is brought into flow connection with the liquid surrounding the bladder 4 or can be filled with a separate liquid, such as water, concrete, lead or the like. In the exemplary embodiment shown, the ballast weight 11 has been filled with a separate liquid via an angled filler neck 16 which is closed with a cap 17 made of plastic. If such ballast weights 11 are present, the gas distributor or the gas supply device 7 does not need to be attached to the bottom of the basin containing the liquid to be gassed.

In the embodiment shown in FIG. 5, the bladder 4 is ring-shaped and is fastened to the pipeline 15 in the region of two diametrically opposite gas supply openings 3 by means of the gas supply nozzle 2 designed as a bead 8 that can be buttoned into the gas supply openings 9.

In the embodiment shown in Fig. 6, the bladder 4 is also annular. However, its interior is in flow connection via a single branching gas supply connection 2, which is at its lower end lo

is again formed as a bead 8 which can be buttoned into the gas supply opening 9. In the annular bladder 4 there is a second annular bladder as ballast weight 11, which has been filled with water via the filler neck 16.

In the exemplary embodiment shown in FIG. 7, the bladder 4 consists of two bladder halves which are held together gas-tight on their mutually facing edges by means of an annular shaping element 10. In the area of the gas supply opening 3 of the lower half of the bladder, a gas supply connection 2 designed as a bead 8 is connected, which is buttoned into the gas supply opening 9 with its lower end. The bladder 4 is shown in a state in which it has not yet been fully inflated. When inflated, the shaping element 10 gradually rises from its lowest position in the direction of the arrow.

; /

Reference symbol list:

1 gas outlet

2 gas supply nozzles

3 gas supply opening

4 bubble

5 bladder wall

6 pipe sockets

7 gas supply device

8 bead

9 gas supply opening

10 shaping element

11 ballast weight

12 clamp

13 ring flange

14 check valve

15 pipeline 6 filler neck 7 cap

Claims

Claims:

1. Device for gassing liquids, in particular for aerating waste water, by means of a gas distributor which can be arranged under the liquid level and can be connected to a gas supply device and which has at least one membrane-like wall made of flexible material with a large number of gas outlet openings (1) , characterized in that the wall is designed as a support-free bladder (4) which is held only by at least one gas supply nozzle (2) and is closed except for at least one gas supply opening (3) and the gas outlet openings (1).

2. Device according to claim 1, characterized in that the gas outlet openings are distributed substantially over the entire surface of the bladder (4).

3. Apparatus according to claim 1 or 2, characterized in that the bladder (4) assumes a predetermined shape under gas pressure, preferably essentially the shape of a ball, a flattened ball or a horizontally lying ring.

4. Device according to one of claims 1 to 3, characterized in that the bubble wall (5) is held in a predetermined shape by means of horizontal and / or vertical rib-shaped thickenings.

5. Device according to one of claims 1 to 4, characterized ge indicates that the effective opening cross-section of the Gas¬ outlet openings (1) in adaptation to the liquid pressure to be overcome by the gas outlet openings (1) to be overcome has different sizes.

6. Device according to one of claims 1 to 5, characterized ge indicates that the bubble wall (5) has different thicknesses in adaptation to the liquid pressure to be overcome by the gas outlet openings (1) to be overcome by gas.

7. Device according to one of claims 1 to 6, characterized ge indicates that the bladder wall (5) consists of a stretchable, for example rubber-elastic material.

8. Device according to one of claims 1 to 7, characterized ge indicates that the bubble wall (5). from an inextensible, e.g. textile material.

9. Device according to one of claims 1 to 8, characterized ge indicates that the bladder wall (5) consists of textile material or has a textile reinforcement insert or pads.

10. Device according to one of claims 1 to 9, characterized ge indicates that the gas outlet openings (1) are introduced into the pre-tensioned bladder wall (5) made of stretchable material.

11. The device according to one of claims 1 to 10, characterized ge indicates that the gas outlet openings (1) are introduced into the non-biased bubble wall (5).

12. The device according to one of claims 1 to 11, characterized ge indicates that the gas outlet openings (1) have an increasing cross-section from the inside to the outside. left

13. The device according to one of claims 1 to 12, characterized ge indicates that the bladder (4) with its gas supply nozzle (2) on a pipe socket (6) of a gas supply device (7) is slipped.

14. Device according to one of claims 1 to 13, characterized in that the bladder (4) has a gas supply nozzle (2) with a bead (8) which can be buttoned into a gas supply opening (9) of the gas supply device (7).

15. Device according to one of claims 1 to 14, characterized ge indicates that the bladder (4) is integrally formed or consists of several wall sections which vulcanized together, welded together and / or glued together, sewn together and / or by means e.g. of an annular shaping element, zipper or the like are connected to one another.

16. The device according to one of claims 1 to 15, characterized ge indicates that the bladder wall (5) surrounds a ballast weight (11) at a distance.

17. The apparatus according to claim 16, characterized in that the ballast weight is designed as a hollow body made of rigid or flexible material, the interior of which is in flow communication with the liquid surrounding the bladder (4) and / or with a liquid such as water, concrete, lead or the like. is fillable.

18. Device according to one of claims 1 to 17, characterized ge indicates that a check valve (14) is arranged in the pipe socket (6) and / or the Gasver¬ supply opening or the vicinity thereof.