WO2023118060A1

WO2023118060A1 - Cavitating-jet regulator

Info

Publication number: WO2023118060A1
Application number: PCT/EP2022/086873
Authority: WO
Inventors: Marc Tempel; Seoung-Eun Kim
Original assignee: Neoperl Gmbh
Priority date: 2021-12-20
Filing date: 2022-12-20
Publication date: 2023-06-29
Also published as: CN116290242A; DE202021106933U1; CN218508569U

Abstract

For a jet regulator (1) which comprises an accelerating unit (2) and a distributing unit (3), the accelerating unit (2) having at least one nozzle (4), and an interspace (5) being formed between the accelerating unit (2) and the distributing unit (3), it is proposed that the interspace (5) should have a lateral extent which is smaller than a lateral extent of the distributing unit (3).

Description

Cavitation jet ruler

The invention relates to a jet regulator which has an acceleration unit and a distribution unit, the acceleration unit having at least one nozzle, and an intermediate space being formed between the acceleration unit and the distribution unit. Such a jet regulator is known in practice.

The object of the invention is to improve the operating properties and the spray pattern of a spray regulator. The object is solved by the features of the independent claims. Advantageous configurations are described in the dependent claims.

To solve this problem, the invention proposes the features of claim 1. In particular, it is therefore proposed according to the invention in a jet regulator of the type described above to achieve the stated object that the intermediate space has a lateral extent that is smaller than a lateral extent of the distribution unit. A backwater of liquid, in particular water, can thus be generated in the aerator. The lateral extension of the intermediate space can be, for example, a maximum and/or a minimum lateral extension of the intermediate space.

The lateral extent of the distribution unit can be characterized, for example, by a diameter or a similar dimension of an area of the distribution unit that is subjected to the flow and/or is functionally effective.

To solve the problem, the invention further proposes the features of claim 2 . In particular, therefore, according to the invention in an aerator of the beginning In order to solve the above problem, it is proposed that the jet regulator has a nozzle that has a narrowing section, a constriction section, and a widening section in its course sequentially, for example in the direction of flow, preferably immediately following one another, and that the length of the narrowing section is greater than a length of the bottleneck section and that a length of the flare section is greater than the length of the bottleneck section. In this way, microbubbles, which are caused by cavitation, can be formed efficiently and guided into the liquid, for example water.

For example, the lengths mentioned in this description can be measured along a main or mean flow direction and/or along a direction of insertion of the jet regulator.

For example, the constriction can be made so short that the constriction section and the widening section merge practically directly into one another. It can thus be easily achieved that cavitation bubbles get into the expansion section and can be detached there with the water and swept away.

The constriction section can be characterized, for example, by a substantial reduction in an opening cross section in the direction of flow or by an acceleration zone.

The expansion section can be characterized, for example, by a substantial enlargement of an opening cross section in the direction of flow or by a deceleration zone.

The constriction section can, for example, be characterized in that it represents a transition between the constriction section and the widening section and/or a section with an opening cross section that is essentially constant in the direction of flow.

For example, the constriction section can be characterized in that a change in the opening cross section is smaller than a thickness of a boundary layer of a flowing liquid on a wall in this section. It can thus be achieved that unevenness or changes in the opening cross section in the constriction section have little or no influence on flow behavior in a flow center. In other words, the constriction section can be designed to be constant in cross section, except for such minor deviations.

To solve the problem, the invention further proposes the features of claim 3 . In particular, it is therefore proposed according to the invention in an aerator of the type described above to solve the stated object that the aerator has a nozzle and that the nozzle in its course sequentially, for example in the direction of flow, preferably immediately following one another, a constriction section, a widening section and a Has outlet section, and that a length of the widening section is greater than a length of the constriction section. This means that microbubbles, which are caused by cavitation, can be efficiently formed and fed into the liquid. The outlet section can be used to fluidically decouple the widening section from subsequent, larger spaces, for example an intermediate space.

The outlet section can be longer, for example have than the expansion section.

The outlet section can be characterized, for example, in that it represents a section with an opening cross section that is essentially constant in the direction of flow.

For example, the outlet section can be characterized in that a change in the opening cross section is smaller than a thickness of a boundary layer of a flowing liquid on a wall in this section. It can thus easily be achieved that the outlet section is practically constant for the flow conditions inside the flow.

To solve the problem, the invention further proposes the features of claim 4 . In particular, it is therefore proposed according to the invention in a jet regulator of the type described above to achieve the stated object that the jet regulator has an acceleration unit, the acceleration unit having at least one nozzle, that the nozzle is designed asymmetrically, with a widening along the circumference of a constriction section is formed to different extents in different peripheral sections. In this way, a vacuum can be formed efficiently and reliably, and a state that is advantageous for cavitation can thus be achieved. The creation of negative pressure can thus be easily restricted to limited sections of the circumference, so that the negative pressure remains locally concentrated. This facilitates the formation of bubbles.

For example, the widening can be limited to a circumferential section, in particular a circumferential section of less than 180°. Advantageous configurations of the invention are described below, which can optionally be combined with the characteristics of claim 1 to claim 4 alone or in combination with the characteristics of other configurations.

It should be pointed out that the features listed individually in the dependent claims can be combined with one another in any technologically meaningful manner and define further refinements of the invention. In addition, the features specified in the claims are specified and explained in more detail in the description, with further preferred configurations of the invention being presented.

Cavitation is the formation and dissolution of vapor-filled cavities (vapour bubbles) in liquids. The formation and development of cavitation is advantageous in jet regulators, since it creates a regular jet pattern that is attractive to the user. Compared to the well-known addition of air, smaller bubbles can be achieved. A jet can thus be generated whose quality lies between the clear quality of a laminar jet and the milky quality of an aerated jet.

In the present invention, the cavitation is triggered by the shape of the nozzle or. influenced .

Advantageously, the nozzle consists or has sequentially in its course in the direction of flow via a constriction section, a constriction section, an expansion section and an outlet section.

In the constriction section takes a lateral extension of

Nozzle in flow direction. In the bottleneck section is the lateral extent of the nozzle minimal or the smallest . In the widening section, a lateral extent of the nozzle increases in the direction of flow. A lateral extent of the nozzle can be greatest in the outlet section and/or remain constant within the nozzle and/or within the outlet section.

At the end of the run-out section there is a gap.

In the constriction section, streamlines of the liquid are narrowed and the liquid is thus accelerated. A negative pressure can then form in the constriction section, the negative pressure being at most equal to the vapor pressure of the liquid, for example water. At 20 °C the vapor pressure of water is about 0.023 bar. Due to the negative pressure, microbubbles form in the constriction section due to cavitation, which migrate along the nozzle in the direction of flow. The size of the cavitation bubbles increases in the expansion section. In the outlet section, the cavitation bubbles detach from the wall of the nozzle and migrate into the liquid and further into the gap, forming microbubbles.

Due to the special shape of the space, it is also possible for a negative pressure to arise in the space and for microbubbles to form as a result of cavitation, especially in the upper area of the space. This negative interstitial pressure can also draw the aforementioned microbubbles into the interstitial space. The negative pressure can also facilitate detachment of the cavitation from the wall of the nozzle.

The terms "radial" and "axial" can refer to a direction of insertion of the aerator or on a longitudinal extent of the jet regulator in the direction of flow. The term "lateral extension" can refer to a radial one obtain distance .

The term microbubbles is used for bubbles whose size is in the micrometer range or which can be made visible through a microscope and which arise as a result of cavitation.

In an advantageous configuration it can be provided that a longitudinal extent of the intermediate space is at least twice as large as a longitudinal extent of the at least one nozzle. The longitudinal extension of the intermediate space is preferably at least three times or 3.5 times or 3.7 times as large as the longitudinal extension of the at least one nozzle. In this way, liquid, for example water, can be backed up in the intermediate space.

The back pressure of liquid in the intermediate space is advantageous since cavitation-related detachment of cavitation bubbles between the nozzle and the intermediate space then takes place more easily.

In an advantageous configuration, it can be provided that the intermediate space has a decoupling zone, which has a lateral extent that is smaller than half a lateral extent of the distribution unit. In the decoupling zone, the microbubbles are mixed with the backed-up liquid. This area of the intermediate space, which has a minimal diameter, is regarded as the decoupling zone.

In an advantageous configuration, it can be provided that the intermediate space is designed to taper conically in the direction of flow. Thus, liquid back-up and easier mixing with the microbubbles can be achieved. In an advantageous configuration it can be provided that the intermediate space is biconcavely curved. In this way, liquid can be backed up.

In an advantageous configuration it can be provided that the intermediate space is rotationally symmetrical to a longitudinal axis of the jet regulator. A shape of the intermediate space which is advantageous for cavitation can thus be achieved.

In an advantageous configuration, it can be provided that an inflow-side cross section of the intermediate space is smaller than an outflow-side cross section of the intermediate space. In this way, liquid can be backed up near the outlet section.

In an advantageous configuration it can be provided that on the inflow side an angle between a wall of the intermediate space and the longitudinal axis of the jet regulator is not equal to 0°. In this way, the microbubbles can be detached from the wall in the intermediate space in a simple manner.

In an advantageous configuration it can be provided that a hollow space is formed between a wall of the intermediate space and a housing wall. The wall of the intermediate space can thus be flexible and elastic. Furthermore, the construction can thus be simplified, for example by means of injection molding. The cavity is preferably circumferential on the radial side and forms an annulus.

In an advantageous embodiment, it can be provided that the distribution unit has a lateral extent that is matched to a lateral extent of a downstream outlet structure. In this way, liquid can be backed up in the distribution unit. The advantage here is that—taking into account any sieve grids that may have been inserted—the lateral extensions can be selected relative to one another in such a way that the outlet structure can be filled with water.

In an advantageous embodiment, it can be provided that a lateral extension of the constriction section is at least one third, in particular at least half and/or at most four fifths or 0.7 times, the lateral extension at the end of the widening section and/or at the beginning of the constriction section is . Thus, microbubbles can be formed as a result of cavitation. The value of 0.7 has proven to be the preferred limit in tests/simulations.

In an advantageous configuration it can be provided that a lateral extension at the beginning of the narrowing section is equal to a lateral extension at the end of the widening section or differs at most 50 or 35 percent from a lateral extension at the end of the widening section. Thus, microbubbles can be formed efficiently due to the cavitation.

In an advantageous embodiment it can be provided that the length of the constriction section is less than 6 times, in particular less than 4 times or less than 10 percent, the length of the narrowing section and/or the widening section. Thus, cavitation bubbles can be formed more easily due to cavitation in the throat portion. It can be said that a short bottleneck section is beneficial.

In an advantageous configuration it can be provided that the widening section has a curved profile. The curved profile is preferably in the form of a segment of a circle or a segment of an ellipse. The curved profile helps the cavitation bubbles to grow and detach from the wall and migrate into the liquid.

In an advantageous embodiment it can be provided that the constriction section has a curved profile. The curved profile is preferably in the form of a segment of a circle or a segment of an ellipse. Thus, the curved profile aids in accelerating the liquid or the narrowing of the streamlines.

In an advantageous embodiment it can be provided that the distribution unit is a splitter and/or has a splitter plate. In this way, a backwater can be reached at the distribution unit.

The splitter plate or the splitter can fulfill two functions: firstly, a homogenization of the flow and the jet pattern, which consists of microbubbles and liquid, and secondly, a back pressure, which has an advantageous effect on the absorption of microbubbles.

A back pressure is needed to provide liquid that can mix with the microbubbles created by the cavitation. A spray pattern that is attractive and regular for the user can thus be achieved.

In an advantageous embodiment it can be provided that the distribution unit has bores. The bores are preferably nozzle-like, in particular with their diameter being variable. A backwater of liquid can thus be provided.

In an advantageous embodiment, it can be provided that the bores are conical. A backwater of liquid can thus be provided.

In an advantageous configuration, it can be provided that a diameter of the bores decreases in the direction of flow. In this way, liquid can be backed up with the advantages already mentioned.

In an advantageous configuration it can be provided that a lateral extension of the nozzle in the axial direction is variable, for example not constant. Thus, the flow lines of the liquid can be modified in such a way that a vacuum and, as a result, microbubbles are created by cavitation.

In an advantageous configuration, it can be provided that the acceleration unit includes an attachment screen and a cavitation plate. In this way, dirt can be filtered out in the direction of flow and the speed of the flow can be increased. The cavitation plate has the shape already mentioned and thus favors the formation of microbubbles. The attachment screen can prevent the nozzle in the cavitation plate from being blocked or completely clogged by dirt.

In an advantageous configuration, it can be provided that the cavitation plate has radial thickenings on the inside. These thickenings preferably narrow an opening cross section of the nozzle. Improved acceleration of the flow within the nozzle can thus be achieved.

In an advantageous configuration it can be provided that the thickened areas are formed symmetrically and alternately with connecting webs. So one can improved acceleration of the flow within the nozzle can be achieved.

In an advantageous embodiment it can be provided that the nozzle is ring-shaped. The nozzle is preferably not continuous in the circumferential direction. In this way, an efficient and regular jet can be provided and cavitation can be positively influenced.

The acceleration unit preferably has an annular bead. The annular bead can be arranged radially on the nozzle on the inflow side and on the inside. The torus can cause an acceleration of the flow inside the nozzle and a narrowing of the streamlines.

The entirety of the constriction section, constriction section and widening section can be referred to as an annular bead.

The housing of the jet regulator can preferably comprise a housing part and a counter housing part.

It is advantageous if the nozzle is not continuous in the circumferential direction. Thus, localized acceleration can be provided within the nozzle.

Screen grids can be arranged on the outflow side of the distribution unit. The screen grids are preferably arranged in the counter-housing part.

The distribution unit can split a water jet into several partial jets.

The housing part can have an inside seating arrangement. Preferably, this seat assembly takes the Cavitation plate and additionally or alternatively the attachment screen.

The distribution unit is preferably arranged between the housing part and the counter housing part.

The counter-housing part has at least one screen mesh. A plurality of screen grids are preferably arranged. The counter-housing part has a seating arrangement which can accommodate the screen mesh or screens.

The screen grids are preferably made of a plastic. The screen grids can also consist of a thermoplastic elastomer.

On the downstream side there is an angle between the wall of the

gap and the longitudinal axis of the aerator 0°. Thus, a homogenization of the flow can be achieved in an end area of the intermediate space.

On the inflow side, a ratio of an opening cross section of the nozzle to an inflow side opening cross section of the intermediate space is less than 0.1. Thus, microbubbles can be formed more easily due to the cavitation.

In one embodiment it can be provided that the distribution unit has an input and a plurality of outputs. A division of an inflowing water stream into partial streams is thus easily achievable.

It can be provided here that a sum of opening cross sections of the outlets is matched to an opening cross section of the inlet. In this way, a backwater can easily be set at the distribution unit. For example, it can be provided that the sum of Opening cross-sections of the outlets are larger than the opening cross-section of the inlet. Thus, water can drain off easily.

Alternatively it can be provided that the sum of the opening cross sections of the outlets is smaller than the opening cross section of the inlet. Thus, water can easily accumulate. It is thus even achievable that the gap fills.

Alternatively it can be provided that the sum of the opening cross sections of the outlets is equal to the opening cross section of the inlet. A uniform flow can thus form.

For example, each outlet can be designed as a particularly preferably nozzle-like bore, preferably as described above.

In one configuration it can be provided that the intermediate space is delimited by the distribution unit. A direct transition from the intermediate space into the distribution unit can thus be achieved.

As an alternative or in addition to this, provision can be made for the intermediate space to be delimited by the acceleration unit. This means that the water escaping from the acceleration unit can get directly into the intermediate space.

It can thus be provided, for example, that the intermediate space is delimited by the distribution unit and the acceleration unit. Transition pieces between these functional sections are not necessary.

In one embodiment it can be provided that the Distribution unit has a headroom that is less than an axial length of a subsequent output. Thus, a low distribution unit can be provided.

In one configuration it can be provided that an axial extent of the intermediate space is greater, in particular more than four times as large as the or a clear height of the distribution unit. A comparatively large intermediate space can thus be combined with a distribution unit that is at least comparatively small.

In one configuration it can be provided that at least one ventilation opening is formed downstream of the distribution unit. Thus, aeration is achievable regardless of microbubble generation occurring in the gap.

In one configuration it can be provided that the intermediate space is not ventilated. A disruption of flow behavior in the intermediate space by inflowing air can thus be avoided.

In one embodiment it can be provided that the intermediate space has an outlet and/or a plurality of inlets. A combination of different individual beams from the acceleration unit can thus be achieved.

It can be provided here that the outlet of the intermediate space corresponds to the or an inlet of the distribution unit. Thus, an immediate transition can be set up.

Alternatively or additionally, it can be provided that at least some of the multiple inputs of the intermediate space are arranged eccentrically in relation to the intermediate space. This means that swirl flows can be avoided, for example by aligning the nozzles of the acceleration unit axially.

The invention will now be described in more detail using a few exemplary embodiments, but is not limited to these few exemplary embodiments. Further variants of the invention and exemplary embodiments result from combining the features of individual or multiple claims with one another and/or with one or more features of the exemplary embodiments and/or the variants of devices according to the invention described above.

It shows:

1 shows a jet regulator according to the invention

sectional view,

FIG. 2 shows the jet regulator from FIG. 1 in a perspective sectional view,

3 shows an exploded view of the jet regulator from FIG. 1,

4 shows a large view (a), a detailed view (b) and a perspective view (c) of the cavitation plate from above,

5 shows a large view and a detailed view of the cavitation plate from below,

6 shows a detailed view of the acceleration unit and

FIG. 7 shows a detailed view of a nozzle from FIG. 6.

8 is a perspective view of the distribution unit Fig. 9 is a sectional view through the cavitation plate

Fig. 10 is another sectional view through the

cavitation plate

Fig. 11 is another sectional view through the

Cavitation plate and a detail view.

In the following description of various exemplary embodiments of the invention, elements that have the same function are given the same reference numbers, even if the design or shape differs.

For the sake of clarity, not all reference symbols are set in the figures, although the elements can very well be present in the figures. However, the same reference symbols designate functionally and/or constructively identical components and functional units.

Fig. 1 shows a jet regulator 1 according to the invention in a sectional representation.

The jet regulator 1 has a housing which includes a housing part 12 and a counter housing part 13 . A distribution unit 3 is formed between the housing part 12 and the counter-housing part 13 . The distribution unit 3 is shown in FIG. 1 designed as a splitter plate 14 . Alternatively, the distribution unit 3 can also be designed as a splitter. The splitter plate 14 has bores 19 which are conical. A diameter of the bores 19 decreases in the direction of flow. The jet regulator 1 also has an acceleration unit 2 . The acceleration unit 2 comprises an attachment screen 10 and a cavitation plate 11 . A direction of flow (the main or intermediate flow) is from the screen attachment 10 in FIG. 1 down .

The cavitation plate 11 has at least one nozzle 4 . The nozzle 4 is asymmetrical, with a widening along the circumference of a constriction section being formed to different extents in different circumferential sections. Fig. 4 shows that the nozzles are non-round. The nozzle 4 is divided into four sections in the direction of flow (cf. FIG. 7): a constriction section 6 , a constriction section 7 , a widening section 8 and an outlet section 9 . A lateral extent decreases in the narrowing section 6 in the direction of flow. A lateral extent is smallest in the constriction section 7 . A lateral extent increases in the widening section 8 in the direction of flow. A lateral extent is greatest in the outlet section 9 and remains constant in the direction of flow.

For example, the constriction section 7 can be characterized in that a change in the opening cross section is smaller than a thickness of a boundary layer of a flowing liquid on a wall in this section.

The length of the constriction section 6 is greater than the length of the constriction section 7 , and the length of the widening section 8 is greater than the length of the constriction section 7 . The lengths of the narrowing section 6 and the widening section 8 are the same or differ by a maximum of 10 percent.

For example, the outlet section 9 can be characterized in that a change in the Opening cross section is smaller than a thickness of a boundary layer of a flowing liquid on a wall in this section.

The jet regulator 1 also has an intermediate space 5 which is arranged between the acceleration unit 2 and the distribution unit 3 . A maximum lateral extent 26 is matched to a position of the nozzles 4 . The intermediate space 5 has a biconcave curvature. The intermediate space 5 has a longitudinal extent that is at least twice as large, preferably at least five times as large as a longitudinal extent of the at least one nozzle 4 . The space 5 also has a decoupling zone 24 which defines a minimum lateral extent 25 of the space and which is less than half a lateral extent 27 of the distribution unit 3 .

The lateral extension 27 of the distribution unit is characterized by a diameter of the surface 28 of the distribution unit 3 that is subjected to the flow and/or is functionally effective.

The decoupling zone 24 is the part of the intermediate space 5 which has a minimum diameter. The space 5 tapers conically in the direction of flow. The intermediate space 5 is rotationally symmetrical to a longitudinal axis 21 of the jet regulator 1 . An inflow-side cross section of the intermediate space 5 is smaller than a downstream cross-section of the intermediate space 5 . On the inflow side, an angle between a wall of the space 5 and the longitudinal axis 21 of the jet regulator 1 is not equal to 0°. Thus, a detachment of cavitation bubbles from the wall that leave the nozzle 4 can be improved. On the outflow side, an angle between a wall of the intermediate space 5 and the longitudinal axis 21 of the jet regulator 1 is 0°. This prevents liquid from backing up in the space 5 of the aerator 1 can be achieved. The back pressure helps provide a liquid that can absorb the microbubbles created by cavitation.

Furthermore, a cavity 17 is formed between a wall of the intermediate space 5 and a housing wall 18 . The cavity 17 ensures that the wall of the space 5 is elastically deformable. Through the cavity 17, the construction or. Production of the housing part 12 simplified by injection molding technique k or the like. The cavity 17 is circumferentially pronounced in a circumferential orientation and forms an annulus or annulus .

The housing part 12 has a seating arrangement which can accommodate the cavitation plate 11 and the attachment screen 10 .

The distribution unit 3 has a lateral extent that is matched to a lateral extent of a downstream outlet structure 22 .

The lateral extension of the constriction section 7 is at least one third of the lateral extension at the end of the widening section 8 and/or at the start of the narrowing section 6 . The terms "beginning" and "end" can refer to the direction in which the jet regulator 1 or relate to the flow direction.

A lateral extension at the beginning of the narrowing section 6 is the same as or at most 10 percent different from a lateral extension at the end of the widening section 8 .

The length of the constriction section 7 is less than 10 percent of the length of the narrowing section 6 and/or the widening section 8 . The length of the constriction section 7 is therefore relatively small compared to the lengths of the narrowing section 6 and/or the widening section 8 . The constriction section 6 is mirror-symmetrical to the widening section 8 , the axis of symmetry being defined by the constriction section 7 .

The flare section 8 has a curved profile. The profile is preferably in the form of a segment of a circle or an elliptical segment.

The throat section 6 has a curved profile. The profile is preferably in the form of a segment of a circle or an elliptical segment.

The curved profiles aid in the formation, growth and detachment of the cavitation bubbles.

The distribution unit 3 preferably has nozzle-like bores 19 . The bores 19 are preferably of conical design, with a diameter of the bores 19 decreasing in the direction of flow. The shape of the bores 19 helps to create a back pressure of liquid in the space 5, which is helpful in detaching and absorbing the microbubbles in the liquid.

A lateral extent of the nozzle 4 is variable in the axial direction, in particular not constant. The lateral extension is only constant within the outlet section 9 .

The cavitation plate 11 has radial thickenings 20 on the inside, which narrow an opening cross section of the nozzle 4 . In the example, the thickenings 20 run axially, ie for example in the direction of flow and/or in the direction of insertion of the jet regulator 1 .

The thickenings 20 are symmetrically alternating with

Connecting webs 29 formed. Thus, an improved

Acceleration of the flow within the nozzle 4 can be achieved. The nozzle 4 is ring-shaped, but not continuous in the circumferential direction, since the thickenings 20 form barriers.

Screen grids 15 , 16 are arranged downstream of the distribution unit 3 . The screen grids 15 , 16 are arranged in the opposite housing part 13 . On the outflow side of the screen grids 15, 16 is a

Outlet structure 22 arranged. The counter housing part 13 has a seating arrangement which can accommodate the screen mesh 15 , 16 . The screen grids 15, 16 are preferably made of one

Plastic f or a thermoplastic elastomer made.

The cavitation plate 11 has radial thickenings 20 on the inside, which are formed symmetrically alternating with connecting webs 29 . The thickenings 20 narrow a clear opening cross section of the nozzle 4 and ensure, among other things, an acceleration of the flow within the nozzle.

Fig. 2 shows the jet regulator 1 from FIG. 1 in a perspective sectional view. The description from FIG. 1 also applies accordingly in FIG. 2 .

Fig. 3 shows an exploded view of the jet regulator 1 from FIG. 1 . The jet regulator 1 has a housing part 12 and a counter housing part 13 . The housing part 12 has a peripheral annulus which forms a cavity 17 . The housing part 12 has a seating arrangement which can accommodate a screen attachment 10 and a cavitation plate 11 . On the inside, the housing part 12 has an intermediate space 5 . The counter-housing part 13 can accommodate one or more screen meshes 14 , 15 . A splitter plate 14 is arranged between the housing part 12 and the counter-housing part 13 . In this case, the splitter plate 14 is part of a distribution unit 3 . The splitter plate 14 preferably has nozzle-like bores 19 . The counter-housing part 13 has an outlet structure 22 on the outflow side.

Fig. FIG. 4 shows a close-up view, a detailed view and a perspective view of the cavitation plate 11 from above. "From above" in this context means on the inflow side. The cavitation plate 11 has a circumferential annular bead 23 .

In each nozzle 4 the annular bead 23 occupies a circumferential section of less than 180°. Thus, the widening, which forms behind the annular bead 23 in the direction of flow, is limited in the circumferential direction. On the remaining peripheral sections, the lateral delimitation of the nozzle 4 is stepless, so that the widening here is weaker, namely not at all in the borderline case.

The annular bead 23 divides the nozzle 4 into four sections in the axial direction: a constriction section 6, a constriction section 7, a widening section 8 and an outlet section 9 (not shown here). The cavitation plate 11 has thickenings 20 which protrude into the nozzle 4 . The thickenings 20 are formed symmetrically alternating with connecting webs 29 . The thickenings 20 narrow the cross section of the at least one nozzle 4 . The purpose of the thickenings 20 is to modify the flow lines so that a negative pressure can arise in the nozzle 4, which promotes the formation of cavitation. The nozzle 4 is annular, but the nozzle 4 is not continuous in the circumferential direction, since the sharp-edged thickenings 20 of the cavitation plate 11 form one or more barriers.

Fig. 5 shows a large view and a detailed view of the cavitation plate 11 from below. "From below" means in this Relationship downstream. The cavitation plate 11 has a circumferential annular bead 23 . The annular bead 23 divides the nozzle 4 into four sections in the axial direction: a constriction section 6, a constriction section 7, a widening section 8 and an outlet section 9 (not shown here). The cavitation plate 11 has thickenings 20 which protrude into the nozzle 4 . The nozzle 4 is ring-shaped, but the nozzle 4 is not continuous in the circumferential direction, since the thickenings 20 form barriers. The clear opening cross section of the nozzle 4 is reduced by the thickenings 20 .

Fig. 6 shows a detailed view of the acceleration unit 2 . The acceleration unit 2 comprises an attachment screen 10 and a cavitation plate 11 . The purpose of the attachment screen 10 is to filter out debris in the flow and prevent clogging of the cavitation plate 11 . The purpose of the cavitation plate 11 is to generate microbubbles by the principle of cavitation. This is achieved by the special shape of the nozzle 4 . In the direction of flow, the nozzle has four sequential sections: a constriction section 6 , a constriction section 7 , an expansion section 8 and an outlet section 9 . The constriction section 6, the constriction section 7 and the widening section 8 can be referred to as an annular bead 23, which is arranged radially on the inflow side of the nozzle 4 and runs along the circumference. The toroidal bead 23 narrows streamlines and accelerates the flow in the nozzle 4 .

Fig. 7 shows a detailed view of a nozzle 4 from FIG. 6 . The nozzle 4 has four sequential sections: a constriction section 6 , a throat section 7 , an expansion section 8 and an outlet section 9 . On the inside of the cavitation plate 11 there is a radial annular bead 23 trained all around. The outlet section 9 leads into the intermediate space 5 on the outflow side. On the inflow side, an angle between the wall of the intermediate space 5 and a longitudinal axis 21 of the jet regulator 1 is not equal to 0°. Thus, microbubbles can be formed more easily.

Fig. 8 shows a perspective view of the distribution unit 3 . The distribution unit 3 is designed here as a splitter plate 14 . The lateral extent 27 of the distribution unit 3 can be characterized, for example, by a diameter or a similar dimension of a surface 28 of the distribution unit 3 that is subjected to the flow and/or is functionally effective. The distribution unit 3 has a regular arrangement of bores 19 . The bores 19 are of conical design, with a diameter decreasing in the direction of flow.

Fig. 9 and figs. 10 show sectional views through the cavitation plate 11. The symmetrical arrangement of enlargements 20 and connecting webs 29 can be seen adjacent to the nozzle 4 . The nozzle 4 is ring-shaped, but not continuous in the circumferential direction on the inflow side and outflow side. The special arrangement and shape between the nozzle 4, thickenings 20 and connecting webs 29 helps with the formation of cavitation bubbles. The annular bead 23 is formed radially and circumferentially on the inside. The connecting webs 29 ensure that the nozzle 4 is not continuous in the circumferential direction. The narrowing section 6 and the widening section 8 have a curved profile. In the specific case, it is a profile in the shape of a segment of a circle, so that the curved profiles of the constriction section 6 and the widening section 8 are mirror-symmetrical to the constriction section 7 . A length of the constriction section 7 can also be zero or be very short. Fig. 11 shows a further sectional illustration through the cavitation plate and a further detailed view. The nozzle 4 is divided into the sections 6-9 already mentioned. The constriction section 6 and the widening section 8 have a curved profile. In the specific case, the curved profile is a profile in the shape of an elliptical segment, which means that the narrowing section 6 and the widening section 8 are no longer mirror-symmetrical to the constriction section 7 . An annular bead 23 is formed radially and circumferentially on the inside. The length of the bottleneck section 7 is shorter than the length of the narrowing section 6 and the length of the widening section 8 . In the specific case, the length of the outlet section 9 is the greatest. The outlet section is characterized in that a lateral extension of the outlet section is constant.

It can be seen in FIG. 1 that the distribution unit 3 has a central inlet 30 and several (eccentric) outlets 31 in order to divide inflowing water into partial flows.

In this case, a total of opening cross sections of the outlets 31 is matched to an opening cross section of the inlet 30 .

Each outlet 31 is designed as a nozzle-like bore 19 .

The gap 5 is delimited by the distribution unit 3 downstream and the acceleration unit 2 upstream.

The distribution unit 3 has a clear height 32 that is smaller than an axial length 33 of a subsequent outlet 31 .

An axial extension 34 of the gap 5 is more than four times as large as the clear height 32 of the distribution unit 3 .

A plurality of ventilation openings 35 are formed side by side in the circumferential direction and downstream of the distribution unit 3 . The intermediate space 5 , on the other hand, is not ventilated, so that a uniform flow in the intermediate space 5 is not disturbed.

The intermediate space 5 has an exit 36 and several entrances 37 . It is thus possible to combine different individual beams from the acceleration unit 2 .

The outlet 36 of the intermediate space 5 coincides with the inlet 30 of the distribution unit 3 .

The entrances 37 of the intermediate space 5 are arranged eccentrically with respect to the intermediate space 5 .

In the case of a jet regulator 1, which comprises an acceleration unit 2 and a distribution unit 3, wherein the acceleration unit 2 has at least one nozzle 4, and wherein an intermediate space 5 is formed between the acceleration unit 2 and the distribution unit 3, it is proposed that the intermediate space 5 has a lateral extent that is smaller than a lateral extent of the distribution unit 3 .

/ List of References List of reference symbols jet regulator acceleration unit distribution unit nozzle intermediate space narrowing section narrowing section widening section outlet section attachment screen cavitation plate housing part counter-housing part splitter plate screen grid other screen grid cavity housing wall bore, bores thickening, thickening longitudinal axis outlet structure annular bead decoupling zone (minimal ) lateral extension of the intermediate space (maximum ) lateral extent of the intermediate space lateral extension of the distribution unit incoming flow Area Connecting webs Entrance from 3 Exit from 3 clear height axial length from 31 axial extent ventilation opening exit of 2 entrance of 2

/ Expectations

Claims

Claims Jet regulator (1), comprising an acceleration unit (2) and a distribution unit (3), wherein the acceleration unit (2) has at least one nozzle (4), and wherein an intermediate space (5) between the acceleration unit

(2) and the distribution unit (3), characterized in that the intermediate space (5) has a lateral extent (25, 26) which is smaller than a lateral extent (27) of the distribution unit

(3) is. Aerator (1), in particular according to claim 1, comprising an acceleration unit (2), wherein the acceleration unit (2) has at least one nozzle (4), and the nozzle (4) sequentially in its course a constriction section (6), a constriction section (7) and a widening section (8), characterized in that a length of the narrowing section (6) is greater than a length of the constriction section (7), and that a length of the widening section (8) is greater than the length of the constriction section ( 7) . Jet regulator (1), in particular according to one of the preceding claims, comprising an acceleration unit (2), wherein the acceleration unit (2) has at least one nozzle (4), and the nozzle (4) sequentially in its course a constriction section (7), has a widening section (8) and an outlet section (9), characterized in that a length of the widening section (8) is greater than a length of the constriction section (7). Aerator (1), in particular according to one of the preceding

Claims, comprising an acceleration unit (2), wherein the acceleration unit (2) via at least one nozzle

(4), characterized in that the nozzle (4) is asymmetrical, with a widening along the circumference of a constriction section (7) being formed to different extents in different circumferential sections. Jet regulator (1) according to one of the preceding claims, characterized in that a longitudinal extent of the intermediate space (5) is at least twice as large, preferably at least three times or 3.5 times or 3.7 times as large as a longitudinal extent of the at least one nozzle (4 ) . Aerator (1) according to one of the preceding claims, characterized in that the intermediate space (5) has a decoupling zone (24) which has a lateral extent (25) which is less than half a lateral extent (27) of the distribution unit ( 3) . Jet regulator (1) according to one of the preceding claims, characterized in that the intermediate space (5) tapers conically in the direction of flow. Jet regulator (1) according to one of the preceding claims, characterized in that the space (5) is biconcavely curved. Jet regulator (1) according to one of the preceding claims, characterized in that the intermediate space (5) is rotationally symmetrical to a longitudinal axis (21) of the jet regulator (1). Jet regulator (1) according to one of the preceding claims, characterized in that an inflow-side cross section of the intermediate space (5) is smaller than an outflow-side cross section of the intermediate space (5). Jet regulator (1) according to one of the preceding claims, characterized in that on the inflow side an angle between a wall of the intermediate space (5) and the longitudinal axis (21) of the jet regulator (1) is not equal to 0°. Jet regulator (1) according to one of the preceding claims, characterized in that a cavity (17) between a wall of the intermediate space

(5) and a housing wall (18) is pronounced. Aerator (1) according to one of the preceding claims, characterized in that the distribution unit (3) has a lateral extent (27) which is matched to a lateral extent of a downstream outlet structure (22). Aerator (1) according to one of the preceding claims, characterized in that a lateral extension of the constriction section (7) is at least one third or half and/or at most four fifths or 0.7 times a lateral extension at the end of the widening section (8) and / or at the beginning of the constriction section (6). Aerator (1) according to any one of the preceding claims, characterized in that a lateral extension at Beginning of the constriction section

(6) is equal to or at most 50 or 35 percent different from a lateral extension at the end of the expansion section (8). Aerator (1) according to one of the preceding claims, characterized in that the length of the constriction section

(7) is less than 6 times or 4 times or 10 percent the length of the constriction section (6) and/or the flare section

(8th) . Jet regulator (1) according to one of the preceding claims, characterized in that the widening section (8) has a curved profile, in particular a profile in the shape of a segment of a circle or a segment of an ellipse. Jet regulator (1) according to one of the preceding claims, characterized in that the constriction section (6) has a curved profile, in particular a profile in the shape of a segment of a circle or a segment of an ellipse. Aerator (1) according to one of the preceding claims, characterized in that the distribution unit (3) is a splitter and/or has a splitter plate (14). Jet regulator (1) according to one of the preceding claims, characterized in that the distribution unit (3) has preferably nozzle-like bores (19). Aerator (1) according to one of the preceding claims, characterized in that the bores (19) are conically shaped. Jet regulator (1) according to one of the preceding claims, characterized in that a diameter of the bores (19) decreases in the direction of flow. Jet regulator (1) according to one of the preceding claims, characterized in that a lateral extension of the nozzle (4) in the axial direction is variable, in particular not constant. Aerator (1) according to any one of the preceding claims, characterized in that the acceleration unit (2) comprises an attachment screen (10) and a cavitation plate (11). Jet exciter (1) according to one of the preceding claims, characterized in that the cavitation plate (11) has radially thickenings (20) on the inside, in particular which narrow an opening cross section of the nozzle (4). Aerator (1) according to one of the preceding claims, characterized in that the thickenings (20) are formed symmetrically alternating with connecting webs (29). Aerator (1) according to one of the preceding claims, characterized in that the nozzle (4) is ring-shaped. Aerator (1) according to one of the preceding claims, characterized in that the distribution unit (3) has an inlet (30) and a plurality of outlets (31), in particular preferably nozzle-like bores (19), in particular with a sum of opening cross-sections of the outlets (31) is matched to an opening cross section of the input (30). Aerator (1) according to one of the preceding claims, characterized in that the intermediate space (5) through the distribution unit (3) and / or the acceleration unit

(2) is limited. Jet regulator (1) according to one of the preceding claims, characterized in that the distribution unit (3) has a clear height (32) which is smaller than an axial length (33) of a subsequent outlet (31). Jet regulator (1) according to one of the preceding claims, characterized in that an axial extension (34) of the intermediate space (2) is greater, in particular more than four times as large as the or a clear height (32) of the distribution unit (3). Jet regulator (1) according to one of the preceding claims, characterized in that at least one ventilation opening (35) is formed downstream of the distribution unit (3) and/or that the intermediate space (5) is formed without ventilation. Aerator (1) according to any one of the preceding claims, characterized in that the intermediate space (5) has an outlet (36) and / or several inputs (37), in particular the output (36) of the intermediate space (2) with the or one Input (30) of the distribution unit (3) coincides and / or wherein at least some of the plurality of inputs (37) of the intermediate space (2) are arranged eccentrically with respect to the intermediate space (5).

/ Summary