FR2698797A1 - Ventilation device - Google Patents

Abstract

The aeration device for the purification of waste water, with an air line (16) leading into an air distribution chamber (18) has a plurality of small air outlet openings located in the area of. wall (10) of the air distribution chamber (18). During ventilation, this device may vibrate. In a variant, this aeration device comprises at least one air supply opening, located in the wall region of the air distribution chamber and a plurality of small air outlet openings made in a membrane. can be elastically deformed in the event that ventilation is carried out and covering, on the outside, the wall zone of the air distribution chamber provided with the air supply opening and fixed at least at the edge of the zone wall.

Description

i

AERATION DEVICE

  The invention relates to a ventilation device for

sewage treatment.

  Such aeration devices serve among other things to ensure aeration of preservation of the freshness of wastewater, the supply of air / oxygen in basins

  activation or for the stabilization of sludge, at

  rivers, lakes or fish ponds, but also, for example, to perform liquid neutralization

  by means of a gas supply, with carbon dioxide.

  To this extent, the concepts that are "air", respectively "aeration", are to be understood in the sense I more

wide concerning the environment brought.

  Such aeration devices (hereinafter referred to as aerators)

  are essentially known in two forms of reali-

  in the form of tubular aerators, respectively

  surface or disc aerators.

  In each case, they have a supply line

  of air leading to an air distribution chamber.

  Tubular aerators are distinguished by the fact that their wall is formed with a plurality of small air outlet openings. The wall may, for example, be composed of a porous ceramic; in other embodiments

  it is a metal body with perforations cor-

  There are also some embodiments

  tubular aerators for which the distribution chamber

  air supply (in the section where it is provided with

  air outlets) is covered on the outside by a membrane, fixed at the edge of the wall of the air distribution chamber. During aeration, the membrane is arched and the air exits through the membrane openings in

the wastewater to be treated.

  In the case of a surface or disk aerator, at least one air supply opening is provided in the zone of

  wall of the air distribution chamber, which is

  green of an elastically deformable membrane in the case of aeration, covering again, on the outside, the corresponding section of the air distribution chamber

  and attached at least at the curb to this wall area.

  Such a disk aerator is known for example by

  US-5 000 884 A A tubular aerator is de-

  Written by the document US Pat. No. 3,490,752 A. In each case, it tends to obtain, for the field of application mentioned, aeration as much as possible in the form of fine bubbles in order to be able to obtain aeration.

  as intense and homogeneous as possible of wastewater.

  Although aerators of the type mentioned above have been proven in principle, there is still a pressing need to increase the intensity of the gas supply, aiming to obtain thinner bubbles than

  it is used with aerators according to the state of the art.

  The invention is based on the knowledge that this object can be achieved with surprising simplicity by the fact that the aeration device is vibrated in the

case of ventilation.

  If the aerator is exposed to a specific natural frequency

  In particular, at least in the sections in which the air flows in the wastewater, the various air bubbles are "sheared" on the edges of the openings of

  corresponding air outlet and divided thus mechanical-

in finer bubbles.

  In this way it is possible to obtain a much higher gas supply intensity, the quantity of air

remaining unchanged.

  In its most general form,

  The invention therefore relates to a ventilation device for the purification of wastewater with an air duct leading into an air distribution chamber and a plurality of small outlet openings.

  located in the wall area of the chamber.

  an air supply opening, or at least one air supply opening located in the wall area of the air distribution chamber and a plurality of small air outlet openings made in a membrane, which can be elastically deformed in the case where aeration is performed and covering the outer side, the wall section of the air distribution chamber provided with the air supply opening and fixed at least at the edge (30) to this zone wall, the aeration device that can be vibrated

in case of ventilation.

  These vibrations can be triggered from different

  This can be trans-

  the ventilation device by vibratory exciters.

  But these can also be waves

  sounding externally or in situ on the

ventilation system.

  In the first case cited, it is applied on the aerator

  for example, a vibrator that transmits mechanical vibrations

  to the air duct, air distribution chamber or other sections of the ventilation device. It is understandable that even in the case of aerators designed

  with a membrane, the membrane is exposed simultaneously

  corresponding vibrations, so that

  analogous effects are established in the perforation zone.

membrane.

  A particularly simple embodiment

  The inventive and economical dispensing device is characterized in that the aeration device can be vibrated by sound waves. According to a preferred embodiment, these sound waves are produced by the supplied air stream itself. In this case, for example, the air duct leading into the air distribution chamber is configured in such a way that the air stream submits the air duct (and indirectly the connected air distribution chamber).

  to this one) to its own vibrations.

  The air duct section from where vibrators

  The transmission of the vibrations to the air distribution chamber, or to the membrane, is therefore optimized in the connection zone or inside the air distribution chamber.

  However, a corresponding realization can be

  also directly in the area of the opening

  supplying air from the air distribution chamber.

  With regard to the aforementioned embodiments, those skilled in the art have again a large number of concrete constructive embodiments.

  particularly simple that the air duct, respectively

  the air intake duct, be carried out in the manner

a whistle.

  In whistles, the vibrations are caused by the air flow brought in. This applies to both closed whistles (end) and open whistles (end). Whistle frequencies behave inversely proportionally to their lengths. you can adjust the desired natural frequency

  through the length of the whistles As indicated

  above, the excitation of the air column may be

  but also with an external sound source

powerful (whistle, speaker).

  Depending on the area of application, the direction,

  The higher the frequency, the lower the amplitude, the smaller the vibration, and the more energetic are the vibrations and, consequently, the intended effect in the sense of the invention of a "fragmentation of air bubbles" in the transition zone between the aerator and the wastewater. In a corresponding manner, it is possible to configure the air duct, respectively the supply duct air, so that the aeration device

  between e ,, resonance by the air flow brought.

  The sound waves produced by the device according to

  invention can reach the area of ultra-modern

sounds or hypersons.

  If the vibrations (sound waves) are caused "in-situ" by the air even brought to the aeration device, the external vibration exciters are removed,

  saving energy,

killing a positive side effect.

  Other features of the invention result

  characteristics of the subclaims, as well as

other documents of the application.

  The invention is explained in greater detail hereinafter at

  two examples of achievement, the first concerned

  tubular aerator and the second, an aerator

  disc In drawing - each time strongly schematized -

  FIG. 1 represents in section a tubular aerator

lar,

  Figure 2 shows in section a disk aerator.

  In the figures, elements of identical construction

  ticks or acting identically are designated by

the same reference numbers.

  The tubular aerator of FIG. 1 is composed of a tubular body having, at its end located on the right in the figure, a cover 12 and at its end located on the left in the figure a cover 14, a

  air duct 16 passing through the cover 14.

  The tubular section 10 is made of a fired ceramic material having an unoriented porosity, while the covers 12, 14, as well as the air duct 16 are metal parts. The tubular section and the covers 12, 14 delimit a chamber of

air distribution 18.

  In the state of the art, it concerns the air duct 16 of a normal tube, through which air is guided into the air distribution chamber 18, where air flows through the fine pores of the ceramic tubular body 10 and passes into the wastewater

  in which is placed the aerator.

  According to the invention, the air duct 16, which is connected at its left end to an air source (not shown), is configured in the manner of a whistle It has, correspondingly, at its left end a kind of mouth 16a and at its end, penetrating into the air distribution chamber 18, an opening 16 on the periphery side whose rear edge, in the direction of the air flow (arrow L) is chamfered

  (from the inside to the outside).

  Correspondingly, in case of air supply, vibrations are caused by the air flow and are transmitted from the air duct to the cover 14 and,

  thence on the tubular body 10 and, thus, put the

  The air exiting through the open pores of the tubular body 10 is, therefore, permanently sheared in the area of the air outlet openings (pores), causing the formation of very small amounts of air.

  air bubbles then flow into the wastewater.

  In Figure 2 is shown a disk aerator

  having a base body 20 whose circular cover

  22 extends at the center an air supply opening 24, from which extends downwardly a connecting tube 26. The base body 20 and its elements are composed in one

  synthetic material reinforced with glass fibers.

  Above the cover 20 extends a cover 28 7. made here in the form of a rubber membrane with perforations.

  The membrane 28 is folded at the edge, on the ground.

  turn of the peripheral surface of the base body 20 and is then fixed with screws 30 on the base body 20. In this way, an air distribution chamber 18 is formed in the region of the connecting tube 26, respectively of the air supply opening 24, and

  between the membrane 28 and the lid 22.

  In the case of non-supply of gas, the membrane 28 has, relative to the base body 20, the position designated by I, in which the membrane 28 thus extends parallel to the

cover 22.

  In the case of gas supply (II), the membrane 28 is

  vault according to the configuration shown in

  Tilles. The supply of air is effected here by an air duct 16 configured in the manner of a whistle, made of metal and

  peripherally fixed to the connecting tube 26.

  As seen in the figure, the air duct 16 tapers "in a funnel" in the upper section,

  the lip 16 c thus produced having a certain elasticity

clean city.

  The air brought in the direction of the arrow L leads, as it passes through the lip 16c, the air duct

  16 to vibrate, these vibrations being transmitted to the tube of

  cord 26, respectively to the base body 20 and from there

at the membrane 28.

  The air brought again by the air supply opening 24 into the air distribution chamber 18, passes, in case of supply of gas, then, through the membrane 28, the air bubbles sheared therefrom as described with the aid of FIG. 1 because of the vibrations, which also makes it possible, in this embodiment, to provide extremely divided air bubbles in the wastewater in which

  find the disk aerator according to Figure 2.

  In both cases, the supplied air thus serves not only for aeration proper, but also simultaneously to produce sound waves and thus

clean vibrations of the aerator.

  In this way, you can vibrate the aerator

  without having need of external vibrator exciter.

  In conclusion, it is referred to the fact that the geometric shapes shown in the air duct 16 (whistles) are given by way of example only and schematically and can be replaced by any other configuration of any construction, by means of which aerator

  can be vibrated according to own vibrations.

Claims (7)

CLAIMS -   Aeration device for purifying wastewater with an air line (16) leading into an air distribution chamber (18) and a) a plurality of small air outlet openings located in the wall area (10) of the air distribution chamber (18), or o) at least one air supply opening (24) located   in the wall area (20) of the chamber of dis-   air distribution (18) and a plurality of small air outlet openings made in a   membrane (28), which can be elastically deformed   In the case where ventilation is effected and covers the outer surface, the wall zone (20) of the air distribution chamber (18) provided with the air supply opening (24) and fixed to the less edge (30) to the wall zone, characterized in that the aeration device can be   caused to vibrate in case of aeration.   2 Aeration device according to claim 1, with the possibility of being able to be subjected to vibrations mechanical in case of ventilation.   3 Aeration device according to claim 1 or 2, with a vibrator acting on the air duct (16) and / or   the air distribution chamber (18).   4 Aeration device according to claim 1   which can be subjected to vibrations by means of   cordings. Aeration device according to claim 4, which can be subjected to vibrations by means of the current of air (L) brought.   Ventilation device according to claim 5, the air duct (16) of which is configured in such a way that the supplied air flow (L) submits the air duct (16) and the air distribution chamber. (18) connected to it at his own vibrations.   A ventilation device according to claim 5, wherein the section of the air duct (16) from which the clean vibrations originate is located in the connection zone to or within the distribution chamber. of air (18). 8 Aeration device according to claim 5 or 6, the air supply opening (24) is configured so that the air flow brought submits the chamber   air distribution (18) to its own vibrations.   9 Aeration device according to any one of   Claims 5 to 8, in which the air duct (16)   and / or the air supply opening (24) is (are) configured like a whistle.   Aeration device according to any one of   Claims 5 to 9, wherein the air duct (16),   respectively the air supply opening (24) are   so that the ventilation device enters into   resonance due to the flow of air supplied.