EP2054556B1 - Jet diffusor - Google Patents

Description

The invention relates to a sanitary unit with a water outlet of an outlet fitting mountable outlet nozzle, in which a Strahlbelüfter is used, which has a Belüftergehäuse having in its housing interior, the inflowing water stream in a plurality of individual beams dividing jet splitter, the downstream a mixing zone for Ventilation of the individual jets is connected downstream, wherein at least one opening in the mixing zone ventilation channel is provided which is at least partially provided between the outlet nozzle and the aerator.

Sanitary units of the type mentioned are already in various versions, inter alia, from WO 2004/033108 A1 previously known. The jet aerators used in the previously known sanitary units have an aerator housing, which can be inserted into the water outlet of a sanitary outlet fitting. In the housing interior of the aerator housing a jet splitter is provided, which can be configured for example as a perforated plate or as a diffuser and flowing to the jet aerator water flow into a plurality of individual jets divided. The jet splitter in the Belüftergehäüse downstream of a mixing zone downstream, in which the individual jets are aerated before they are merged and formed in subsequent functional units of Strahlbelüfters back to a homogeneous, pearly soft and non-sharp overall jet. In order to be able to supply the required air to the mixing zone, at least one ventilation channel is provided which can be formed, for example, by the annular space arranged between an outlet mouthpiece and the aerator housing and leading to mouth openings in the aerator housing.

The aspired with the previously known Strahlbelüftern ventilation of the effluent from the outlet water jet makes itself felt in a variety of air bubbles, which discolor seemingly white the outflowing water jet. In some cultures, however, only a clear, uncolored and thus unaerated water jet is tolerated as food. In addition, the aeration of the water jet may increase the risk that germs are introduced into the water jet, which is why such aeration of the water jet is partially avoided, for example, in hospitals. In such cases, aerators are used, where aeration of the water jet is not possible. Depending on the purpose and area of application, different types of jet regulator are therefore to be produced and stockpiled.

In the DE-AS 1 107 607 Various embodiments of a device are already described, which serves for aerating under pressure escaping water, especially in domestic water pipes. In the prior art device outside air can occur below a perforated transverse wall free, the division of the water and its intimate mixing with air causes a strainer, which is dimensioned so that it emerges from a coherent, interspersed with air bubbles water stream. In order to influence the composition of the water-air mixture produced and, if necessary, to switch on or off the ventilation function, in the previously known device the flow cross-section of the perforated transverse wall and thus the velocity of the water flowing through the transverse wall and impinging on the screen body adjustable. In this prior art device is disadvantageous, however, that the ventilation function is adjusted only indirectly via a change in the flow rate or flow rate of the water flowing to the mixing zone and that at the same time other parameters of the outflowing water jet are changed by adjusting the ventilation function. As a result, the handling of the prior art device is much more difficult.

It has also already provided a device in which in the area below the transverse wall openings, in which the outside air can enter freely, for the production of aerated or unaerated beams optionally screens or screen-free outlet openings can be brought (see. DE-AS 1 184 706 ). However, since such sieves can decelerate the exiting water jet, other parameters of the outgoing water jet are noticeably changed beyond the ventilation function in this device as well. In addition, this prior art device does not allow continuous adjustment of the ventilation function.

From the DE 34 18 165 C2 is already a device with a ventilation device for aerating the exiting a tap water jets named, which aeration device has a plurality of transversely to the outflow of the water jet arranged transverse walls, wherein at least downstream behind the first transverse wall from the outside air can be supplied. In this case, the amount of water per unit of time can be adjusted by rotating a downstream of the aerator protruding spindle. At the DE 34 18 165 C2 previously known device so a variable in its flow rate water jet is generated, which is always ventilated.

Out US-A-2004/0199995 is already a jet aerator with an aerator housing previously known. The previously known jet aerator can be used with its aerator housing in the outlet-side end opening of a throttle or closing piece such that the aerator can be gripped on a protruding from the throttle or closing piece portion and rotated in its relative position to the throttle or closing piece such that the im Throttle or closing piece on the one hand and in the aerator housing on the other hand provided channel sections of the at least one ventilation duct can be brought into an open or closed position in or out of alignment.

As in the case of US-A-2004/0199995 previously known Strahlbelüfter the ventilation duct is radially oriented to: longitudinal axis of the water outlet and as the throttle or closing piece forms the downstream Auslaufendbereich the sanitary outlet fitting, which is arranged on the outer circumference of the throttle or closing piece channel inlet of the ventilation duct is always in the field of view of the user. However, at low line pressures and low flow velocities, as they regularly occur when opening and closing a valve, not yet generated for an air intake vacuum in the mixing chamber below the jet disintegrating device is generated, it happens regularly that the water flowing through before the im Belüftergehäuse downstream components back up and flow into the area of the ventilation duct. Although with increasing flow and increasing acceleration of the individual water jets in the jet disintegration also required for air intake vacuum is generated, but the ventilation duct is repeatedly moistened, which leads in the case of calcareous water to Kalkausfällungen on the one hand as disturbing pollution in the area the outer peripheral side arranged channel inlet of the ventilation duct is perceived and on the other hand, the free channel cross-section of the ventilation duct can be steadily smaller until this ventilation duct is completely dirty and unusable. In addition, in the case of US-A-2004/199995 provided jet aerator the ventilation duct are hermetically sealed against the throttle or closing piece to safely prevent an air intake in the throttle or closed position. For this purpose, it is necessary that the seal, which surrounds the throttle or striker on the one hand and in the aerator on the other hand provided channel sections, biased against the throttle or closing piece, so that applied to the aerator housing rotational movement relative to the throttle or closing piece only with increased friction is possible. As a result, there is the risk that in such a rotational movement on the aerator housing and the throttle or closing piece can inadvertently solve from the downstream end face of the outlet fitting. In addition, the one from the US-A-2004/0199995 previously known attachment unit the disadvantage that it is not compatible with commercially available Strahlbelüftern and therefore can be produced only with significantly increased manufacturing costs.

It is therefore an object to provide a sanitary unit of the type mentioned above with a jet aerator whose ventilation function vary in a simple manner allows, which is correspondingly versatile and with the known disadvantages of known Strahlbelüftern can be avoided.

The achievement of this object is that for throttling and / or optional switching on or off the ventilation function, a throttle or closing piece is provided by means of a rotary and / or a sliding movement between the at least one ventilation channel opening open position and a the at least one ventilation duct at least partially closing throttle or closed position is movable, and that the throttle or closing piece in the throttle or closed position the at least one ventilation duct in the region of at least one leading to the mixing zone channel mouth or in the region of at least one channel inlet at least partially closes.

Since the jet aerator of the sanitary unit according to the invention is used in an outlet nozzle which can be mounted on the water outlet of an outlet fitting, commercially available jet aerators can also be used. Since the at least one ventilation channel is not arranged radially and its channel opening therefore does not have to be arranged on the outer circumference of the sanitary unit, limescale deposits lying in the field of vision of the user are avoided. Since the required for throttling and / or optional connection or disconnection of the ventilation function rotary and / or sliding movement is applied to the throttle or closing piece, and since the jet aerator is held in contrast in a mountable on the water outlet of the outlet fitting outlet nozzle, an unintentional release avoids the existing of jet regulator, throttle or closing piece and Auslaüfmundstück sanitary unit. A particularly simple yet advantageous embodiment according to the invention provides that the throttle or closing piece is sleeve-shaped and surrounds the aerator housing.

It is expedient if the throttle or closing piece is held rotatably and / or displaceably on the aerator housing or on the outlet mouthpiece.

An embodiment according to the invention provides that the throttle or closing piece in its open position and / or in its throttle or closed position is preferably releasably latched.

It may be useful if the throttle or closing piece is connected via a screw thread with the outlet nozzle.

Another embodiment according to the invention is that the throttle or closing piece carries an annular seal, which at least partially closes the inlet opening of the ventilation channel provided between outlet mouthpiece and aerator housing in the throttling or closing position of the throttling or closing piece.

Further features according to the invention will become apparent from the following description of the figures and the claims. The invention will be described in more detail below with reference to advantageous embodiments.

Fig. 1 bis 2

einen Strahlbelüfter, bei dem ein zu einer Mischzone im Belüftergehäuse führender Belüftungskanal im Bereich der Einlassöffnung öffen- und verschließbar ist,

Fig. 3 bis 4

einen Strahlbelüfter, bei dem die Einlassöffnung des Belüftungskanals durch eine Dichtfläche am Belüftergehäuse begrenzt ist, die mit einer Gegen-Dichtfläche an einem in Richtung zum Belüftergehäuse bewegbaren Drossel- oder Schließstück zusammenwirkt,

Fig. 5 bis 6

einen Strahlbelüfter, der in ein Auslaufmundstück einsetzbar ist, das statt des in Figur 3 und 4 vorgesehenen Innengewindes ein Außengewinde trägt, mit dem das Auslaufmundstück an einer sanitären Auslaufarmatur lösbar montierbar ist,

Fig. 7 bis 8

einen Strahlbelüfter, bei dem am Belüftergehäuse ein Drossel- oder Schließstück axial verschieblich geführt ist, das in seiner Schließstellung die zu einer Mischzone im Gehäuseinneren führenden Mündungsöffnungen des Belüftungskanals verschließt,

Fig. 9 bis 12

einen Strahlbelüfter, bei dem das Drossel- oder Schließstück verdrehbar am Belüftergehäuse gehalten ist und umfangsseitig Belüftungsöffnungen trägt, die in Offenstellung des Schließstücks mit Mündungsöffnungen im Belüftergehäuse fluchten, während das Schließstück in seiner Schließstellung die Mündungsöffnungen verschließt,

Fig. 13 bis 16

einen Strahlbelüfter, dessen Drossel- oder Schließstück ein verdrehbar am Auslaufmundstück gehaltenes Drehstück und ein am Belüftergehäuse axial verschieblich geführtes Verschlussstück hat, wobei Drehstück und Verschlussstück mittels einer Schraubverbindung miteinander verbunden sind, die eine Drehbewegung am Drehstück in eine axiale Schiebbewegung des Verschlussstücks umsetzt,

Fig. 17 bis 19

einen mit Figur 13 bis 16 weitestgehend vergleichbar ausgestalteten Strahlbelüfter und

Fig. 20 bis 24

einen Strahlbelüfter, dessen Drossel- oder Schließstück axial verschieblich am Belüftergehäuse geführt ist und in seiner Schließstellung die Mündungsöffnungen am Belüftergehäuse verschließt.

It shows:

Fig. 1 to 2

a jet aerator in which a ventilation duct leading to a mixing zone in the aerator housing can be opened and closed in the region of the inlet opening,

Fig. 3 to 4

a jet aerator in which the inlet opening of the ventilation channel is delimited by a sealing surface on the aerator housing, which cooperates with a counter-sealing surface on a throttle or closing piece which can be moved in the direction of the aerator housing,

Fig. 5 to 6

a jet aerator, which is insertable into an outlet nozzle, which instead of the in FIGS. 3 and 4 provided internal thread carries an external thread with which the outlet nozzle is detachably mounted on a sanitary outlet fitting,

Fig. 7 to 8

a jet aerator, in which a throttling or closing piece is axially displaceably guided on the aerator housing, which in its closed position closes the outlet openings of the ventilation channel leading to a mixing zone in the interior of the housing,

Fig. 9 to 12

a jet aerator wherein the throttle or striker is rotatable on the aerator housing is held and circumferentially carries ventilation openings, which are aligned in the open position of the closing piece with orifices in the aerator housing, while the closing piece closes the mouth openings in its closed position,

Fig. 13 to 16

a jet aerator whose throttling or closing piece has a rotary piece held rotatably on the outlet nozzle and a closure piece guided axially displaceably on the aerator housing, the rotary piece and closing piece being connected to one another by means of a screw connection which converts a rotational movement on the rotary piece into an axial sliding movement of the closing piece,

17 to 19

one with FIGS. 13 to 16 largely comparable designed jet aerator and

FIGS. 20 to 24

a jet aerator whose throttle or closing piece is guided axially displaceably on the aerator housing and in its closed position closes the mouth openings on the aerator housing.

In the FIGS. 1 to 24 is a jet aerator in different versions 1, 2, 3, 4, 5, 6 and 7 shown. The jet aerator 1, 2, 3, 4, 5, 6 and 7 has an aerator 8, which is mounted on the water outlet of a sanitary outlet fitting not shown here. For this purpose, an outlet nozzle 9 is provided, which is screwed with an external thread 10 or an internal thread 11 at a provided at the water outlet of the outlet fitting counter thread and in which the jet aerator 1, 2, 3, 4, 5, 6 and 7 from the inflow side the outlet mouthpiece 9 can be used up to a plug stop.

The jet aerator 1, 2, 3, 4, 5, 6 and 7 has in the housing interior of its aerator 8 a jet splitter 12, which flows to the jet aerator 1, 2, 3, 4, 5, 6 and 7 flowing water steel in a variety divided by individual beams. This jet splitter 12 may be formed as a perforated plate, - in the present figures, the jet splitter 12, however, is designed as a cup-shaped diffuser, which at the peripheral edge of its cup shape at uniform intervals distributed flow openings 13 has arranged. The jet splitter 12 is a downstream mixing zone 14 downstream in the housing interior of the aerator 8, in which the individual jets can be vented before in a downstream and preferably designed as a honeycomb perforated plate 15 flow rectifier or optionally in other upstream functional units of Strahlbelüfters 1, 2, 3, 4, 5, 6 and 7 are formed into a homogeneous, pearlescent and non-squirting water jet and merged.

In order to be able to ventilate the individual jets in the mixing zone 14, a ventilation channel 16 designed as an annular space is provided between the outlet mouthpiece 9 and the aerator housing 8, which opens into a plurality of mouth openings 17 arranged peripherally on the housing periphery of the aerator housing 8 and serving as a channel outlet. Due to the narrowing of the beam cross section in the region of the jet splitter 12 and the consequent increase in the speed of the individual jets in comparison to the incoming water flow, a negative pressure is created in the mixing zone 14 which leads to the suction of air via the ventilation channel 16.

From a comparison of FIGS. 1 to 24 we clearly that the ventilation function of the jet aerator 1, 2, 3, 4, 5, 6, 7 optionally switched on or off. For this purpose, a throttle or closing piece 18 is provided which can be moved by means of a rotary and / or sliding movement between an open position opening the at least one ventilation channel 16 and a closed position closing the at least one ventilation channel 16. Since the ventilation function is continuously variable in the embodiments 1, 2, 3, 4, 5, 6, 7 shown here, intermediate positions are also possible with respect to the open position throttled ventilation function.

The throttle or closing piece 18 is sleeve-shaped and surrounds the fan housing 8. While in the in the FIGS. 1 to 6 and 13 to 16 shown jet regulators 1, 2, 5, the throttle or closing piece 18 closes the ventilation channel 16 in the region of at least one channel inlet 19, can the throttle or closing piece 18 of the illustrated in the remaining figures Strahlbelüfter 3, 4, 6 and 7 in the region of at least to block a channel mouth leading to the mixing zone 14.

In the in the FIGS. 7 to 12 and 20 to 24 shown Strahlbelüftern 3, 4 and 7, the throttle or closing piece 18 on the aerator 8 is rotatably and / or slidably held. In contrast, in the jet aerators 1, 2, 5 and 6, the throttle or closing piece 18 at the outlet nozzle 9 is movably guided.

The throttle or closing piece 18 of the jet aerator 3, 4, 7 is releasably latched at least in the closed position.

At the in Figure 1 to 4 shown Strahlbelüftern 1, 2, the throttle or closing piece 18 via a screw thread 20 is rotatable and axially adjustable on the outer circumference of the outlet nozzle 9 held. In this case, the throttle or closing piece 18 carries in the Figures 1 and 2 illustrated Strahlbelüfters 1 at its inner circumference a ring seal 21 which closes the channel inlet of the provided between the outlet nozzle 9 and aerator 8 ventilation channel 16 in the closed position of the throttle or closing piece.

The in the FIGS. 3 and 4 illustrated jet aerator 2 has at the outlet side end edge region of its aerator 8 a circumferential sealing surface 22 which cooperates with a mating surface 23 on the throttle or closing piece 18. As from the in FIG. 4 1, the inlet opening 19 of the ventilation channel 8 is delimited by the sealing surface 22 and the counter-sealing surface 23, which has a corresponding slope to the jet aerator longitudinal axis.

By a rotational movement on the throttle or closing piece 18, the closing piece 18 is screwed onto the outlet nozzle 9 in such a way that in the closed position according to FIG FIG. 3 the sealing surface 22 the sealing surface 23 sealingly applied. In this case, between the throttle or closing piece 18 on the one hand and outlet nozzle 9 on the other hand provided annular gap is sealed by means of a ring seal 24 which is held in an annular groove 25 on the outer circumference of the outlet nozzle 9.

While the outlet mouthpiece 9 of in FIGS. 3 and 4 shown jet regulator 2 with an internal thread 11 can be attached to the water outlet of a sanitary outlet fitting is in the in FIGS. 5 and 6 illustrated jet aerator 2 to an external thread 10 is provided.

The aerator 8 of the in FIGS. 7 and 8 shown Strahlbelüfters 3 has at its downstream housing peripheral edge Mouth openings 17, which can be closed by means of a throttle or closing piece 18, which is guided axially displaceably on the outer circumference of the aerator 8. The throttle or closing piece 18 has corresponding passage openings 26 which only in the in FIG. 8 shown open position with the leading to the mixing zone 14 orifices 17 are aligned. In the open and in the closed position, the throttle or closing piece 18 can be releasably latched on the housing outer periphery of the jet aerator.

In the FIGS. 9 to 12 a comparatively ausgestalteter jet aerator 4 is shown, the passage openings 26, however, can be brought by a rotational movement with the mouth openings on the aerator 8 in coincidence. To be able to perceive tangibly that the jet aerator 4 in the in FIGS. 10 and 11 shown open position, 18 corresponding locking means 27, 28 are provided between the aerator 8 and throttle or closing piece, which engage in the various open and closed positions, respectively.

The in the FIGS. 13 to 19 shown jet aerator 5, 6 have a two-piece throttle or closing piece 18 with a rotatably held on the outlet nozzle 9 rotary piece 29 and a jet aerator 5, 6 axially displaceably guided closure piece 30. In this case, the rotary piece 29 and the closure piece 30 are connected to one another via a screw connection 31, which converts a rotary movement on the rotary piece 29 into an axial sliding movement of the closure piece 30. By turning the rotary piece 29, the closure piece 30 of the in FIG. 13 and 15 shown open position in the in FIG. 14 Shown closed position to be adjusted axially until the provided on the inner circumference of the closure piece 30 counter-sealing surface 23, the sealing surface arranged on the downstream end edge region of the aerator 8 sealing surface 22 acts sealingly.

A similarly ausgestalteter jet aerator 6 is in the FIGS. 17 to 19 displayed. However, the jet aerator 6 on the water outlet of the jet aerator 6 facing side of the mouth openings 17 on a bead-shaped projecting sealing surface 22 which cooperates with the inflow-side and a corresponding slope having end edge region of the closure piece 30, which end edge region forms the counter-sealing surface 23. In FIG. 19 is indicated that the outer circumference of the rotating piece is configured out of round, so that the user can clamp the rotating piece rotatably between the fingers.

The in FIGS. 20 to 24 shown Strahlbelüfter 7 has at its aerator 8, the axially displaceably guided throttle or closing piece 18, which in its open position according to FIG. 21 and in its closed position according to FIG. 20 can lock on aerator 8 each case.

The Strahlbelüfter 1, 2, 3, 4, 5, 6, 7 wear on the inflow side a Vorsatzsieb 34, which retain the entrained in the water dirt particles and the proper function of Strahlbelüfters 1, 2, 3, 4, 5, 6, 7 secure. All jet aerators 1, 2, 3, 4, 5, 6, 7 carry an inflow-side sealing ring 37, which is sealingly clamped between the aerators 1, 2, 3, 4, 5, 6, 7 and the adjacent end edge of the water outlet of the outlet fitting.

In the FIGS. 20 to 24 It can be seen that a handle 36 protrudes on the outer end edge region of the throttle or closing piece 18. This handle 36 is integrally formed on the throttle or closing piece 18 and formed by a, reaching to a longitudinal center plane wall portion of the throttle or closing piece 18, which wall portion of the in FIGS. 20 and 21 illustrated output or standby position in the in FIGS. 22 and 23 shown use position can be bent to the longitudinal center plane out. In this position of use, the throttle or closing piece 18 can be grasped on the handle 36 and moved in the desired direction of rotation. To better grip the handle 36, this has a preferably centrally arranged and outwardly to about the outlet nozzle 9 protruding projection 35.

Claims (15)

1. Sanitary unit comprising an outlet mouthpiece (9) which can be mounted on the water outlet of an outlet fitting and into which there is inserted a jet aerator (1, 2, 3, 4, 5, 6, 7) which comprises an aerator housing (8) which comprises in its housing interior a jet splitter (12) which divides the incoming water flow into a multiplicity of individual jets and downstream of which, at an outflow side, there is connected a mixing zone (14) for aerating the individual jets, wherein at least one aerating channel (16) is provided which issues in the mixing zone (14) and which is provided at least in sections between the outlet mouthpiece (9) and the aerator housing (8), characterised in that for throttling and/or selectively activating or deactivating the aerating function a throttling or closing piece (18) is provided which by means of a rotational and/or sliding movement can be moved between an open position, which opens the at least one aerating channel (16), and a throttling or closed position which at least partially closes the at least one aerating channel (16), and in that the throttling or closing piece (18), in the throttling or closed position, at least partially closes the at least one aerating channel (16) in the region of its at least one channel mouth, which leads to the mixing zone (14), or in the region of its at least one channel inlet (19).
2. Sanitary unit as claimed in claim 1, characterised in that the throttling or closing piece (18) is sleeve-shaped and engages around the aerator housing (8).
3. Sanitary unit as claimed in claim 1 or 2, characterised in that the throttling or closing piece (18) is held so as to be rotatable or slideable on the aerator housing (8) or on the outlet mouthpiece (9).
4. Sanitary unit as claimed in any one of claims 1 to 3, characterised in that the sanitary unit (3, 4, 7) has, on the periphery of its aerator housing (8), at least one mouth opening (17) which leads to the mixing zone (14), and in that the sleeve-shaped throttling or closing piece (18), in its throttling or closed position, at least partially closes the at least one mouth opening (17).
5. Sanitary unit as claimed in any one of claims 1 to 4, characterised in that the throttling or closing piece (18) can be latched in its open position and/or in its throttling or closed position.
6. Sanitary unit as claimed in any one of claims 1 to 5, characterised in that the throttling or closing piece (18) is connected to the outlet mouthpiece by means of a screw thread (20).
7. Sanitary unit as claimed in any one of claims 1 to 6, characterised in that the throttling or closing piece (18) carries an annular seal which, in the throttling or closed position of the throttling or closing piece (18), at least partially closes the inlet opening (19) of the aerating channel (16) which is provided between the outlet mouthpiece (9) and the aerator housing (8).
8. Sanitary unit as claimed in any one of claims 1 to 7, characterised in that the throttling or closing piece (18) engages around the outlet mouthpiece (9), and in that the outer periphery of the throttling or closing piece (18) is designed as a handle.
9. Sanitary unit as claimed in any one of claims 1 to 8, characterised in that a circumferential sealing surface (22) is provided on the aerator housing (8) and interacts with a counterpart sealing surface (23) on the throttling or closing piece (18), and in that the throttling or closing piece (18), in its closed position, acts with its counterpart sealing surface (23) in a sealing manner upon the sealing surface (22) on the aerator housing (8).
10. Sanitary unit as claimed in claim 9, characterised in that the inlet opening (19) of the at least one aerating channel (16) is bordered by the sealing surface (22) and the counterpart sealing surface (23).
11. Sanitary unit as claimed in any one of claims 1 to 10, characterised in that the throttling or closing piece (18) is formed in two parts and comprises a rotary piece (29), which is held so as to be rotatable on the outlet mouthpiece (9), and a closure piece (30) which is guided so as to be slideable in the axial direction on the aerator housing (8), and the rotary piece (29) and the closure piece (30) are connected by means of a screw connection (31) which converts a rotational movement on the rotary piece (29) into an axially oriented sliding movement of the closure piece (30).
12. Sanitary unit as claimed in claim 11, characterised in that the closure piece (30) carries the counterpart sealing surface (23).
13. Sanitary unit as claimed in any one of claims 9 to 12, characterised in that the circumferential sealing surface (22) provided on the aerator housing (8) is arranged on the outlet-side end edge region of the aerator housing (8) or on the housing periphery below the at least one mouth opening (17).
14. Sanitary unit as claimed in any one of claims 1 to 13, characterised in that a handle (35) protrudes on the outer end edge region of the throttling or closing piece (18).
15. Sanitary unit as claimed in claim 14, characterised in that the handle (35) is provided on a partial region of a peripheral wall of the throttling or closing piece, which partial region is separated by a wall incision (36) extending on both sides to the longitudinal central plane of the jet aerator and can be deflected in the direction of the longitudinal central plane of the jet aerator.

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