EP2825707B1 - Check valve for an upwardly directed douche - Google Patents

Description

The invention relates to a reflux barrier, which has a jet nozzle connectable to an inlet, which has a funnel-shaped flow direction tapering in the direction of a nozzle opening of the jet nozzle and is formed in the region of the nozzle opening as a nipple or knob-shaped projection, and has a catching part which has to capture the liquid jet coming from the jet nozzle via a free jet path and which can be connected or connected to a drain, as well as having an outlet arranged below the free jet path, which outlet has to discharge a liquid subset not captured by the capture part, wherein at least one spray or partition wall is arranged in the free jet path with distance from the jet nozzle and the capture part, which spray or partition wall has a through-opening, wherein the provided in the spray or partition through-hole in comparison to the beam cross-section d it has liquid jet larger clear opening cross-section, and wherein the clear opening cross-section of the passage opening is dimensioned so that the liquid jet unbundled from the transmission opening and passes therethrough without contact.

Showers in toilets are operated with water from the general supply network. To protect the general supply network, from which the integrated into the toilets Unterduschen be fed, against the ingress of pathogenic germs, a permanent-acting backflow barrier is required. If the spray nozzle of a sub-shower is located in the area of the edge of a toilet bowl bowl, it must be expected that the nozzle opening of this spray nozzle becomes contaminated with dirty water or excrement particles. Since a direct connection to the water supply there is a risk that it may penetrate pathogenic germs via the shut-off valve in the drinking water supply network, the national and European standards and the conditions of the water companies see a so-called indirect connection between the general supply network and the toilet before, if these toilets, if necessary also subsequently in the toilet seat, are equipped with a Unterdusche.
Also, it is already known to combine the bath inlet with the bath spout in a tub bottom side trough opening. Since the bathtub inlet is thus arranged below the water surface, the bath water can run into the bathtub free of splash water and with little noise. However, since the bathing water present on the incoming water and the bath opening, already in the bathtub, involves the risk that contaminated bath water or service water flows into the water supply network, an effective inlet safety device and backflow barrier must also be ensured in this application example.

From the EP 0 785 314 A1 (see. DE 69 723 124 T2 ) is a backflow barrier of the type mentioned above, the in a tubular and surrounded by an outer housing inner housing has a plurality of connectable with an inlet and axially aligned jet nozzles. In this case, the inflow-side section of the jet nozzles following in the flow direction is designed as a capture opening which has to capture the liquid jet coming from the inflow-side jet nozzle. In the region between a first and a second jet nozzle in the flow direction, the inner housing has a housing opening which-depending on the orientation of the inner housing-serves as an outlet through which a subset of the water flowing through may escape from the inner housing , Since the jet nozzles of this known backflow barrier should absorb as much of the complete amount of water as possible, their capture openings are to be dimensioned so that the water jet passes through the free jet path between the jet nozzles unbundled from the jet openings and without contact through them. In this way, the liquid jet coming from the first jet nozzle in the jet direction is passed through the second jet nozzle serving as a spray or dividing wall, to be recaptured and directed to the drain by a third jet nozzle acting as a capture part of the known backflow barrier , While only the first jet nozzle of the known backflow barrier in the region of its nozzle opening carries a nipple or knob-shaped projection, the subsequent jet nozzles are formed flat at their upstream and downstream end faces in the beam direction. Water droplets which adhere above the nozzle openings, in particular on the inflow side of these jet nozzles, can thus run down into the region of the nozzle opening and lead there to an uncontrolled turbulence of the water jet arriving there, as long as this water droplet is in the inflow-side region of a nozzle opening located.

From the CH-PS 444 076 is already a comparable backflow barrier with a housing previously known, in which housing also a jet nozzle is provided. In order to connect the jet nozzle to the general drinking water supply network, the jet nozzle can be connected to a housing inlet. In the housing, a catching part is provided, which has to capture the coming of the jet nozzle via a free jet path liquid jet. In order to be able to guide the water trapped again at the catching part to the spray nozzle of a sub-shower, the catching part in the housing can be connected to a housing outlet. Below the jet section located between the jet nozzle and the trapping part, there is arranged a housing outlet which has to discharge an amount of liquid, not trapped by the trapping part, out of the housing interior.

These, also referred to in the standards as "free-flow with injector" return barriers, the pressure energy of the inflowing water from the supply network in the jet nozzle is converted into kinetic energy to bring the water jet on the short free jet distance to the atmosphere in combination and subsequently to at least partially convert the kinetic energy of the water jet in the area of the trapping part, also referred to as a diffuser, into pressure energy which is required, for example, for the cleaning jet of the sub-showers. In order to be able to accomplish the conversion of the pressure energy into kinetic energy and subsequently vice versa without major energy losses, and in order to produce a homogeneous and smooth water jet in the area of the free jet path, the jet nozzle and the capture part are to be adapted to each other and to the specific conditions of the respective supply network , It is a disadvantage that the prior art backflow barriers are indeed optimized in view of the prevailing conditions in a particular supply network, but that these backflow barriers may not provide optimal performance under different conditions. It is always effective to ensure that the pipe network is not contaminated with dirty water.

From the DE 92 18 982 U1 a chemical injector with integrated elongated air gap is known, wherein a nozzle opening is disposed immediately downstream of an annular disc bottom and wherein between the nozzle opening and the disc bottom two upwardly extending lugs are formed whose upper edges extend almost to upper upstream edges of slots to provide a small gap area between the top edges of the flags and the slots.

From the US 5 797 420 A a metering device is known in which an elongated slot between an input region and a directly adjacent thereto in the flow path deflection disc is arranged.

From the DE 1 784 274 A is a Rücksaugschutzvorrichtung, in particular for washing machines and dishwashers, known, wherein nozzles are formed on an outer side of an inside flat wall.

Out GB 1 166 040 A Devices are known for the prevention of liquid contamination, wherein in a partition wall, a window is formed in which terminates an opening of a nozzle, wherein a collecting opening is formed immediately adjacent to the partition wall.

From the GB 1 498 724 A a device for preventing backflow of a liquid from a water device in a water supply system is known, wherein a nozzle and a collecting nozzle are formed directly spaced from each other.

From the DE 28 18 691 A1 is a Rücksaugsperre, especially for home appliances, known, in which a nozzle against a restoring force is moved to a collecting opening.

From the DE 24 17 731 is a device for backflow prevention, in particular for water softening devices, known in which in a cylindrical, provided with side vents a movable, in extension of an inlet connection with this connected hollow and elastically variable length baffle body is arranged with an outlet opening at the movable end, located in stretched state, the ventilation openings sealingly applies to the outlet nozzle and in the contracted state creates an air gap between the outlet opening and the outlet nozzle and the ventilation openings releases.

From the US 5,678,592 A1 a backflow prevention device is known in which an exit window is formed between two nozzles arranged directly behind one another.

From the EP 1 452 652 A2 a valve arrangement for a pipe separator is known, wherein a current-increasing and a downstreamvalve preventer is provided.

From the US 2004/0035467 A1 a valve arrangement for pipe separator is known, which has two backflow preventer.

In the return flow barriers of the type mentioned above exists the risk that a jet which is misdirected next to the catching opening of the catching part can jet on impact such that contaminated liquid droplets are unintentionally thrown back into the area of the blasting nozzle. It is therefore an object to provide a backflow barrier of the type mentioned, in which it is ensured that a misdirected next to the capture opening of the Einfangteiles jet does not spray in such a way that contaminated liquid droplets are unintentionally thrown into the area of the jet nozzle and this area can contaminate.

To achieve this object, the invention provides that the catching part protrudes nipple-shaped or knob-shaped in the region of the capture opening.

Since, in the backflow barrier according to the invention, the portion of the catching part bounding the catching opening protrudes in the shape of a nipple or nipple, the catching part can trap the liquid jet coming over the jet path practically without leakage. By this nipple or knob-shaped projecting configuration on the outer circumference of the capture opening is also avoided here, that running splashing drops can cross the beam and disturb.

Also in the case of the backflow barrier according to the invention, at least one spray or partition wall is arranged in the free jet path at a distance from the jet nozzle and the capture part, which spray or partition wall has a passage opening which has a clear opening cross section which is larger than the jet cross section of the liquid jet. If a beam is inadvertently misdirected next to the capture opening of the capture part, this misdirected beam component can at most be returned to the spray or partition wall however, this spray or partition wall effectively protects the underlying area of the jet nozzle. In this way, unintentional contamination in the area of the jet nozzle due to thrown back liquid droplets with certainty is excluded. The spray or dividing wall does not have the function of bundling the jet of liquid coming from the jet nozzle, which is why the jet opening provided in the spray or dividing wall should have a clear opening cross section which is slightly larger in comparison to the jet cross section of the liquid jet.

In this case, an embodiment is preferred in which the clear opening cross-section of the transmission opening is dimensioned such that the liquid jet passes unbundled from the transmission opening and just passes through it without contact.

In order for the spray or partition wall to be able to absorb the water droplets not captured by the catching part, it is advantageous if the spray or partition wall is at least four millimeters apart on the one hand from the catching part and on the other hand from the jet nozzle.

Since a spaced apart from the nozzle opening of the jet nozzle spray or partition wall can lead to an undesirable widening of the liquid jet, an embodiment is preferred in which the distance provided between the jet nozzle and the capture part spray or partition wall is arranged closer to the capture part.

In the backflow barrier of the type mentioned above, there is also the task to optimize the interaction of the jet nozzle, nozzle opening, trapping and capture opening. The optimal tuning of these components is crucial to prevent excessive pressure loss and to avoid unnecessarily strong spattering of the fluid jet. In this case, in particular, the construction and geometry of the catching part and its capture opening are of great importance, which capture opening has to capture the liquid jet well.

The trapping part of the backflow barrier according to the invention is intended to capture the liquid jet without major energy and pressure losses. In order to be able to convert the transmitted via the free beam path by the liquid jet kinetic energy within the Einfangteiles back into the water pressure required at the bottom shower, it is advantageous if the catching part has a capture opening, which has a hollow cylindrical portion, on the downstream side, at least one connect conically or in the clear cross-section widening arcuate portion and preferably at least two such sections, of which the inflow-side portion has a smaller compared to the subsequent section portion expansion. It has surprisingly been found that a catch part designed accordingly in its clear cross-section is characterized by an effective energy conversion. In this case, provided on the outflow side of the hollow cylindrical portion sections of the capture opening can be separated by clearly distinguishable boundary lines or merge into one another by soft transitions.

mit der Maßgabe aufeinander abgestimmt sind, dass der Quotient Q₁ 1 bis 5, vorzugsweise 1,05 bis 2,0 und insbesondere 1,05 bis 1,34 beträgt.An optimized geometrical adaptation of jet nozzle and trapping part provides that the jet nozzle and the trapping part in their dimensions according to the following formula $$\frac{\begin{array}{l}\mathrm{Diameter\; of\; the}\\ \mathrm{capture\; opening}\end{array}}{\mathrm{Diameter\; of\; the\; nozzle\; opening\; of\; the\; jet\; nozzle}}={\mathrm{<figure-callout\; id="1"\; label="Q"\; filenames="imgf0002.png"\; state="\{\{state\}\}">Q</figure-callout>}}_1$$

are matched with the proviso that the quotient Q ₁ 1 to 5, preferably 1.05 to 2.0 and in particular 1.05 to 1.34.

mit der Maßgabe abgestimmt sind, dass der Quotient Q₂ minimal 0,2 und maximal 10, vorzugsweise minimal 1,5 und maximal 2,6 beträgt.For the same reason, a further proposal according to the invention provides that the length l _{1 of} the hollow cylindrical section of the catching part in relation to the opening cross section of the capture opening according to the following formula $$\frac{\begin{array}{l}\mathrm{length}\left({\mathrm{l}}_{}\right)\end{array}}{}$$$$\frac{\begin{array}{l}\left({\mathrm{}}_1\right)\mathrm{of\; the\; hollow\; cylindrical}\\ \mathrm{Part\; of\; the\; catching\; part}\end{array}}{\mathrm{diameter}\left(\mathrm{d}\right)\mathrm{the\; capture\; opening}}={\mathrm{<figure-callout\; id="2"\; label="Q"\; filenames="imgf0001.png,imgf0002.png"\; state="\{\{state\}\}">Q</figure-callout>}}_2$$

are matched with the proviso that the quotient Q _{2 is a} minimum of 0.2 and a maximum of 10, preferably a minimum of 1.5 and a maximum of 2.6.

The optimized coordination between the jet nozzle and the catching part can be impaired if, in particular, dirt or calcium deposits form on the nozzle opening of the catching part. Such lime deposits are possible if the water droplets remaining at the nozzle opening of the jet nozzle evaporate and a lime residue originally contained in the water remains behind. Thus, the backflow barrier according to the invention can be operated comparatively low maintenance and thus the risk of limescale is reduced, it is advantageous if the jet nozzle in the return flow barrier slidably guided and displaced from a standby position into a spray position, in which spray position the jet nozzle their opening surrounding the nozzle Nozzle section penetrates an insertion opening, which is provided in an elasichen membrane or is closed in the ready position by a flap.

The achievement of this object is in the backflow barrier of the type mentioned in particular in that the jet nozzle is displaceably guided in the backflow barrier and displaced from a standby position into a spraying position, in which injection position the jet nozzle with its nozzle orifice delimiting a nozzle section Through opening pierces, which is provided in an elastic membrane or closed in the ready position by a flap.

In this, constructed in accordance with the proposed invention reflux barrier, the jet nozzle is guided displaceably in the return flow barrier and displaceable from a standby position into a spray position. While the jet nozzle in the spray position with its nozzle opening delimiting nozzle portion pierces a through-hole provided in an elastic membrane or in the standby position is closed by a flap, the jet nozzle is concealed in the standby position of the elastic membrane or the flap, so that one Lime deposits leading to reduced evaporation occurs.

In order to be able to displaceably guide the jet nozzle in the backflow barrier and to be able to produce such a backflow barrier in the simplest possible way, a preferred embodiment according to the invention provides that a sleeve-shaped jet nozzle receptacle is provided, in which the jet nozzle slidably guided, and that the jet nozzle receiving is connected via at least one connecting web with the catching part.

It has been shown that the edge region delimiting the nozzle opening should be designed as sharp-edged as possible in order to allow a non-squirting liquid jet to emerge from the jet nozzle. During the manufacturing process, however, there is a risk that this sharp-edged configuration of the edge region delimiting the nozzle opening is impaired by external influences. To counteract such damage to the sharp-edged edge region, a preferred embodiment according to the invention provides that an annular projection is integrally formed on the jet nozzle, which surrounds the nozzle opening.

The generation of a high-energy and non-splashing liquid jet in the jet nozzle is favored when the nozzle opening of the jet nozzle delimiting opening edge is sharp-edged and designed to be chamfered and without rounding.

In this case, a preferred embodiment according to the invention provides that this opening edge of the nozzle opening has an edge degree of less than 0.1 mm or greater minus 0.1 mm.

An optimized outlet of the liquid jet from the jet nozzle is favored when the jet nozzle has a hollow cylindrical clear cross-section in the region of its nozzle opening.

In order to counteract evaporation-induced lime deposits in the region of the nozzle opening of the jet nozzle, a preferred development according to the invention provides that the jet nozzle is arranged in the region of the nozzle opening in the standby position in a water bath or surrounded by water, and in that the flap or the membrane, the through-hole preferably closes liquid-tight in the standby position. Since the jet nozzle is arranged with its nozzle opening in the standby position in a water bath or surrounded by water, evaporation-related limescale deposits on the nozzle opening of the jet nozzle is effectively counteracted. The jet nozzle is only advanced from the water bath or from the water surrounding in the ready position, when the jet nozzle in the spray position pierces the insertion opening, which is provided in the elastic membrane or closed during the standby position by a flap.

The sliding movement of the jet nozzle between the ready position and the injection position is possible by means of a motor drive. However, a particularly simple and therefore preferred embodiment according to the invention provides that the jet nozzle is displaceable from the ready position against a restoring force in the injection position.

A preferred development according to the invention provides, instead of a motor drive, that the jet nozzle is displaceable under the pressure of the liquid flowing through.

In this case, at least one restoring spring can be provided as restoring force, in particular if the insertion opening is to be closed by a flap during the standby position. However, a particularly simple and therefore preferred embodiment according to the invention provides that the restoring force is the inherent elasticity of the material used for the membrane, which is preferably applied to the jet nozzle.

To the slidably guided in the jet nozzle recording Jet nozzle to exert sufficient restoring force, it is advantageous if the jet nozzle protrudes into a cup-shaped membrane which carries the insertion opening on a pot bottom of their pot shape, and when the pot bottom facing away from the peripheral edge of the membrane is elastically supported on the jet nozzle.

A preferred embodiment according to the invention provides that the membrane in the region of the pot bottom of its pot shape seals the jet nozzle receptacle in the region of an opening provided in the guide wall and that the membrane has at least one flow opening at the periphery of its pot shape, which surrounds the interior of the jet nozzle. Recording with the interior of the cup-shaped membrane connects. The sliding movement of the jet nozzle takes place against the inherent elasticity of the membrane. Since the membrane in its the jet nozzle acting on the peripheral edge area must have sufficient space for membrane deformation available, and since the sliding movement of the jet nozzle can be obstructed by means of the membrane densely separated amount of water, there is always a sufficient balance of located in the jet nozzle recording Ensure water during the sliding movement. Since the membrane at the periphery of its pot shape has at least one flow opening which connects the interior of the jet nozzle recording with the interior of the cup-shaped membrane, a damming a water subset obstructing the sliding movement of the jet nozzle is counteracted.

Thus, the backflow barrier according to the invention in a simple way upstream of a sanitary consumption on the inflow side and can be adjusted with little effort to a variety of predetermined conditions such that this backflow barrier is characterized by an optimal function and so that the backflow barrier according to the invention can be easily cleaned and, if required, also be descaled with little effort, it is advantageous if an insertion cartridge is provided which supports the jet nozzle and the capture part, if the insertion cartridge can be inserted into an insertion opening of a cartridge receptacle and is held there in a position of use such that the jet nozzle is connected to the inlet and the trapping part with the drain, and when the insertion cartridge disposed in the between jet nozzle and trapping and the free jet path forming or delimiting cartridge portion has at least one connectable to the outlet cartridge opening ,

The configured according to this embodiment reflux barrier has an insertion cartridge, which Einsetzkartusche has a, connectable to an inlet blast nozzle and a connectable with a drain catching part. While the jet nozzle is connected via the inlet to the general supply network, the catching part directs the water through the drain to a sanitary use point or a comparable water outlet. In this case, the insertion cartridge is held in a position of use such that the jet nozzle is connected to the inlet and at the same time the catching part to the drain. The insertion cartridge has at least one cartridge opening in the cartridge section which is arranged between the jet nozzle and the capture part and delimits the free jet path, said cartridge opening being connectable to the outlet. By loosening the Einsetzkartusche and replacement of Einsetzkartusche the inventive backflow barrier, which can be upstream on a toilet seat, a toilet ceramics or, for example, a bathtub on the inflow side, with little effort to a variety of predetermined conditions adapt such that always a optimal function is guaranteed. By loosening the insertion cartridge the backflow barrier according to the invention is easy to clean and, if necessary, to descale.

A preferred embodiment according to the invention provides that the insertion cartridge can be inserted into an insertion opening of a cartridge receptacle and is preferably detachably fixable there such that the blasting nozzle is connected to the inlet of the cartridge receptacle and the catching part to the outlet of the cartridge receptacle is, and that the insertion cartridge disposed in the between the jet nozzle and the capture part and the free jet path forming or delimiting cartridge portion has at least one connectable to the outlet of the cartridge receptacle cartridge opening.

This cartridge receptacle can be formed in a toilet seat or in a bathtub or designed as an insertable into the toilet seat or the bathtub and designed, for example, as a plastic part housing. However, it is also possible to preconnect the backflow barrier formed in accordance with one or more of the above inventive proposals to a point of use connected to the water supply network, in order to effectively counteract the contamination of the water stored in the water supply network. Such an embodiment can be advantageously used in particular in the hospital sector, where a transmission of germs is to be counteracted.

In this case, the jet nozzle and the cooperating and also provided in the Einsetzkartusche catching part can readily be designed so that the backflow barrier according to the invention is virtually free of leakage in the beam path.

The insertion cartridge can be easily adjusted to fit insert into the backflow barrier according to the invention, when the insertion cartridge is insertable in an insertion opening of a cartridge receptacle and preferably detachably fixable, that the jet nozzle is connected to the inlet and the catching part with the expiration of the cartridge receptacle.

In order to insert the insertion cartridge through the insertion opening into the cartridge receptacle and to close the cartridge receptacle liquid-tight, it is advantageous if the insertion is closed by a cap on which cap the insertion cartridge is detachably fixed or non-detachably connected. For insertion, the insertion cartridge can be grasped and handled over the cap. It is expedient if the insertion cartridge on the cap at least in the direction of rotation and optionally also in the longitudinal direction in its relative position can be fixed, so that at the same time a positioning in the cartridge receiving is ensured.

The ease of use of the backflow barrier according to the invention is favored if the cap is preferably detachably held in the region of the cartridge receptacle by means of a screw or a bayonet or the like plug / rotary connection.

The insertion cartridge or the insertion housing can be easily fixed to the cap when the cap has a cap extension on which the insertion cartridge with a frontally open cartridge end portion is pushed or plugged.

A preferred embodiment according to the invention provides that the insertion cartridge has at least one cartridge inlet wherein the at least one cartridge inlet can be connected to the inlet of the cartridge receptacle via an annular space bounded on both sides circumferentially between the inner circumference of the cartridge receptacle and the outer circumference of the cartridge and longitudinally of the cartridge receptacle. In this preferred embodiment, merely by inserting and fixing the insertion cartridge in the cartridge receptacle, the connection of the blasting nozzle to the inlet of the cartridge receptacle is accomplished simultaneously. In this case, the water flowing into the cartridge receptacle via the inlet of the cartridge receptacle surrounds the insertion cartridge in the region of the annular space in order to be able to flow from there through the at least one inlet into the insertion cartridge and into the blasting nozzle located therein.

In order to incorporate a larger amount of water with the highest possible uniform pressure in the Einsetzkartusche, it is expedient if the Einsetzkartusche has two inlets, and when the inlet of the cartridge receptacle opens in the circumferential direction evenly spaced from the inlets on the annulus.

A preferred development according to the invention provides that the inlets are arranged on opposite sides and approximately at the same height on the cartridge periphery.

It is particularly advantageous if at least one flow guide wall and preferably several lamella-like flow guide walls are provided between the two inlets of the insertion cartridge, and preferably a passage opening is arranged between two adjacent flow guide walls in the direction of the jet nozzle.

In order to connect the Einfangteil when inserting the Einsetzkartusche in the cartridge receptacle in the simplest possible way with leading to a sanitary consumption point, such as a shower or a bathtub drain the cartridge receptacle, sees a particularly simple and advantageous embodiment of the invention in that the catching part terminates in a cartridge outlet located at a front end of the cartridge, and that the cartridge outlet is adjacent to the drain, the drain being provided on the cartridge receptacle, and the inserting cartridge being in the region of the cartridge outlet having cartridge end circumferentially sealed against the inner circumference of the cartridge receptacle.

So that the backflow barrier according to the invention can also be subsequently placed, if necessary, in the area of a sanitary consumption point, it is advantageous if the sleeve-shaped jet nozzle receptacle is connected to the insertion part via at least one connecting web to form an insertion element, if the insertion element can be inserted into a shell-shaped housing is that has a longitudinal insertion opening, if the insertion in the cup-shaped housing is detachably fixable such that the insertion opening forms the outlet, and if the sleeve-shaped jet nozzle receptacle is closed at its end facing away from the jet nozzle by means of a lid, the one with the inlet connectable nipple or the like inlet carries.

In this advantageous embodiment according to the invention, the backflow barrier according to the invention has a shell-shaped housing into which an insertion element can be inserted. The sleeve-shaped jet nozzle recording on the one hand and the catching part on the other hand, at least one Connecting web to the insertion connected to each other. In order to use the insert element in the cup-shaped housing, the housing has a longitudinal insertion opening. The insertion element is detachably fixable in the cup-shaped housing such that the insertion opening forms the outlet. The sleeve-shaped jet nozzle receptacle can be closed at its end facing away from the jet nozzle by means of a lid which carries a connectable with the inlet connection nipple or the like inlet. Since the sleeve-shaped jet nozzle receptacle can be closed by means of the cover, this jet nozzle receptacle is also apparent in such a way that the blasting nozzle displaceably guided in the blasting nozzle receptacle can be easily inserted. Since the formed from the housing and the insertable insert therein reflux barrier forms a functionally reliable and very small unit, this unit can also be retrofitted even on a bathtub, a toilet ceramics, a toilet seat or in the field of other sanitary Switch consumption point into the water supply line.

So that the housing always has a standard distance between the outlet and a bearing acted upon by the housing, it is advantageous if at least one spacer and preferably a plurality of spacers are integrally formed on the housing, which secure a minimum distance from the intended as outlet insertion.

In order for the backflow barrier located in a cartridge receptacle or housing to dry out quickly after each use, it is advantageous if the cartridge receptacle or the housing at the circumference of the cartridge receptacle or the housing in the region of the free jet distance outside Has outlet and preferably on the side facing away from the outlet at least one ventilation opening.

In order to limit the contamination in the interior of the cartridge receptacle or the housing and to prevent the escape of spray, it is expedient if the at least one ventilation opening is designed as a labyrinth-like in the wall of the cartridge receptacle or the housing provided ventilation slot.

In the case described above, a preferred embodiment provides that the housing carries on the longitudinal side remote from the insertion opening the at least one ventilation opening.

In order to accomplish a labyrinthine course of the ventilation openings in the housing provided with a backflow barrier, it is advantageous if the housing has two slot-shaped ventilation openings, which are oriented in the housing longitudinal direction and if the connecting webs of the housing located in the insertion element in a through the slot-shaped Ventilation openings project imaginary level.

In order to protect the backflow barrier according to the invention in the region of its jet nozzle against such contaminated liquid drops, which splash back unintentionally upon impact of the liquid jet on the trapping, it is advantageous if the spray or partition substantially the clear cross-section of the cartridge or housing interior fills.

In order to connect the backflow barrier according to the invention in a simple manner with a shower head or the like consumption point and at the same time to ensure the positionally correct positioning of the components located in the backflow barrier according to the invention, it is advantageous to if a connection nipple or the like outlet is formed on the trapping part for connecting the trapping part to the outlet and if a groove is provided on the outer peripheral side of the trapping part and the outlet into which a wall opening open towards the insertion opening engages on the housing front side of the housing.

In order to ensure the positionally correct positioning of the constituents relative to one another for the function of the backflow barrier according to the invention, it is advantageous if a guide wall is integrally formed on the outside of the jet nozzle receptacle, on each of which a connecting web engages on both sides when in the housing interior of the housing projecting a fork-shaped holder, and when the guide wall in the position of use abuts the arranged between the connecting webs holder, that the forks of the holder are arranged on both sides with a distance from the insertion opening.

It is possible to produce the spray or partition as a separate component and subsequently to attach to the at least one connecting web later. However, preference is given to an embodiment in which the spray or partition wall is integrally formed on the at least one connecting web. Such an embodiment favors the simple production of the backflow barrier according to the invention with few components.

The firm hold of the return flow lock in the housing interior and the positionally correct positioning of the return flow lock in the housing is favored when the jet nozzle receptacle closing lid in the position of use abuts the inside of the adjacent housing end face of the housing and if the molded on the cover nipple or similar Inlet thereby passes through an opening to the insertion opening open at the housing end face.

In order to easily fix the insertion element, but nevertheless sufficiently secure in the housing interior, it is advantageous if the retaining opening or the wall opening has a recess in the insertion at least on one side, by means of which the connection nipple / is releasably latched / are. If the retaining opening or the wall opening have such recesses on both sides of their opening contour, the opening outline approximately has the contour of a keyhole intended for a beard key.

A particularly advantageous embodiment according to the invention provides that between the at least one inlet and the jet nozzle at least one of the functional elements:, flow rate regulator, backflow preventer or sieve 'is provided. In order to produce an optimal water jet in the jet nozzle regardless of fluctuating pressure conditions in the supply network, it is advantageous if between the cartridge or housing inlet and the jet nozzle, a flow regulator is arranged, the per unit of time flowing through water to an optimum for jet nozzle and trapping value regulates and limits. In order to rule out with additional security a backflow possibly also contaminated water in the supply network, it is advantageous if at least one backflow preventer is provided between the at least one cartridge or housing inlet and the jet nozzle.

A particularly easy-to-handle embodiment according to the invention provides that at least one of the functional elements:, flow regulator, backflow preventer or Sieve 'is part of a Einsetzpatrone, and the Einsetzpatrone is preferably used by the frontally open jet nozzle recording in this. The insert cartridge may also include two, downstream, but independent in their function backflow preventer.

It is particularly advantageous if at least one screen or at least one grating is provided between the backflow preventer or the backflow preventers and / or the flow rate regulator on the one hand and the jet nozzle for equalizing the pressure ratios over the clear cross section in the region of the jet nozzle. This grid or sieve is so fine-meshed that it equalizes those pressure gradients which arise over the cross section of the water flow and which may be caused, for example, by the internal structures in a backflow preventer or a flow regulator.

In order to be able to convert the pressure of the liquid coming from the supply network into the highest possible kinetic energy in the region of the jet nozzle, it is provided that the flow guide preferably tapers in a funnel shape in the direction of the nozzle opening of the jet nozzle.

In order to counteract a spreading of the liquid jet, it is provided that the jet nozzle projects in the area of the nozzle opening in the shape of a nipple or a knob. Since the nozzle opening of the jet nozzle protrudes nipple-shaped or knob-shaped, this simultaneously prevents that running drops of spray water can traverse the beam and disturb. In this case, the nipple or nub-shaped jet nozzle can also be withdrawn and bounded by a circumferential groove or indentation.

Preferred application examples of the designed according to at least one of the inventions described backflow preventer provide that the backflow barrier upstream of a sanitary Verbrauchsstelle upstream, and that the sanitary consumption point is preferably a sub-shower or a bottom water inlet of a sink or a bathtub. The reflux barrier according to the invention However, it is also possible, for example, to connect the consumption points provided in a hospital in order to prevent a contamination of the tap water by germs with certainty.

Further developments according to the invention will become apparent from the claims in conjunction with the following description of the figures.

The invention will be described in more detail below with reference to preferred embodiments.

Fig. 1

eine in einem Längsschnitt dargestellte RückflussSperre mit einer Kartuschen-Aufnahme, in die eine Einsetzkartusche eingesetzt ist, die eine Strahldüse und ein, den von der Strahldüse über eine freie Strahlstrecke kommenden Stahl einfangendes Einfangteil trägt,

Fig. 2

die Rückfluss-Sperre aus Figur 1 in einer Seitenansicht,

Fig. 3

die Rückfluss-Sperre aus Figur 1 und 2 in einer Draufsicht,

Fig. 4

die Rückfluss-Sperre aus den Figuren 1 bis 3 in einer auseinandergezogenen Darstellung ihrer wesentlichen Bestandteile,

Fig. 5

eine mit Figur 1 bis 4 vergleichbar ausgestaltete und hier ebenfalls in einem Längsschnitt dargestellte Rückfluss-Sperre, bei der die an der Einsetzkartusche vorgesehene Strahldüse und Einfangteil als separate Bauteile ausgebildet sind,

Fig. 6

die Rückfluss-Sperre aus Figur 5 in einer Seitenansicht,

Fig. 7

die Rückfluss-Sperre aus Figur 5 und 6 in einer Draufsicht,

Fig. 8

die Rückfluss-Sperre aus den Figuren 5 und 7 in einer auseinandergezogenen Darstellung ihrer wesentlichen Bestandteile,

Fig. 9

eine Rückfluss-Sperre in einem Längsschnitt, bei der die Einsetzkartusche durch ein rohrförmiges Verbindungsstück ausgetauscht ist, wobei die hier dargestellte Rückfluss-Sperre einen Rückfluss allenfalls über einen integrierten Rückflußverhinderer verhindern kann,

Fig. 10

die Rückfluss-Sperre aus Figur 9 in einer Seitenansicht,

Fig. 11

die Rückfluss-Sperre aus den Figuren 9 und 10 in einer auseinandergezogenen Darstellung ihrer wesentlichen Bestandteile,

Fig. 12

eine Strahldüse für eine Rückfluss-Sperre gemäß den Figuren 1 bis 8 in einer perspektivischen Darstellung ihrer wesentlichen Bestandteile,

Fig. 13

die Strahldüse aus Figur 12 in einem Längsschnitt, wobei die Strahldüse in einer hülsenförmigen Strahldüsen-Aufnahme derart verschieblich geführt ist, dass diese Strahldüse mit ihrer vorstehenden Düsenöffnung in Spritzstellung die Durchstecköffnung einer Membran durchstoßen kann, wobei die Strahldüse hier in ihrer in die hülsenförmige Strahldüsen-Aufnahme zurückgezogenen -Bereitschaftsstellung gezeigt ist,

Fig. 14

die in der Bereitschaftsstellung befindliche Strahldüse in einer Draufsicht auf die von der Strahldüse zu durchstoßende Membran,

Fig. 15

die Strahldüse aus den Figuren 12 bis 14 in der hier längsgeschnitten dargestellten Spritzposition der Düsenöffnung,

Fig. 16

die Strahldüse aus Figur 12 bis 15 in einer Stirnansicht auf die über die Durchstecköffnung der Membran vorstehende Strahlöffnung,

Fig. 17

die Rückfluss-Sperre in einem schematischen Längsschnitt im Bereich ihres Einfangteiles,

Fig. 18

eine gemäß den Figuren 1 bis 17 ausgestaltete Rückfluss-Sperre, die hier dem wannenbodenseitigen Wassereinlauf einer Badewanne zuströmseitig vorgeschaltet ist,

Fig. 19

eine Rückfluss-Sperre, die in den Wasserzulauf einer gegebenenfalls auch nachträglich an einem WC-Sitz oder eine WC-Keramik montierbaren Unterdusche zwischengeschaltet ist,

Fig. 20

die schematisch dargestellte Wasserführung der in Figur 19 gezeigten Unterdusche, die eine als "Shattaf-Shower" bezeichnete Handbrause hat, wobei die zwischengeschaltete Rückfluss-Sperre im Wasserzulauf erkennbar ist,

Fig. 21

eine weitere Ausführungsform einer Rückfluss-Sperre in einem Längsschnitt, wobei die in Figur 21 gezeigte Rückfluss-Sperre ähnlich zu der in den Figuren 1 bis 18 gezeigten Rückfluss-Sperre ausgebildet ist,

Fig. 22

die Rückfluss-Sperre aus Figur 21 in einer perspektivischen Einzelteildarstellung,

Fig. 23

die Rückfluss-Sperre aus den Figuren 21 und 22 in einer Draufsicht auf den Auslauf dieser Rückfluss-Sperre,

Fig. 24

die in den Figuren 21 und 23 gezeigte Rückfluss-Sperre in einer Seitenansicht,

Fig. 25

die Rückfluss-Sperre aus den Figuren 21 bis 24 in einer Draufsicht auf die dem Auslauf abgewandte Oberseite,

Fig. 26

die hier ebenfalls längs geschnittene Rückfluss-Sperre aus den Figuren 21 bis 25, wobei in dieser Rückfluss-Sperre eine gegen eine Rückstellkraft verschieblich geführte Strahldüse vorgesehen ist, die hier in zwei Schiebepositionen gezeigt ist,

Fig. 27

die Rückfluss-Sperre aus den Figuren 21 bis 26 in den einander gegenübergestellten Schiebepositionen ihrer verschieblich geführten Strahldüse,

Fig. 28

die Strahldüse der in den Figuren 21 bis 27 gezeigten Rückfluss-Sperre in einem Längsschnitt,

Fig. 29

die Spritzdüse der in den Figuren 21 bis 27 gezeigten Rückfluss-Sperre im Bereich ihrer Düsenöffnung, und

Fig. 30

die Strahldüse aus den Figuren 28 und 29 in einer Draufsicht auf die Düsenöffnung.

It shows:

Fig. 1

a Rückflussperperre shown in a longitudinal section with a cartridge receptacle in which an insertion cartridge is inserted, which carries a jet nozzle and a, the coming of the jet nozzle via a free beam path steel catching catching part,

Fig. 2

the reflux lock off FIG. 1 in a side view,

Fig. 3

the reflux lock off FIGS. 1 and 2 in a plan view,

Fig. 4

the reflux barrier from the FIGS. 1 to 3 in an exploded view of its essential components,

Fig. 5

one with Figure 1 to 4 Comparably designed and here also shown in a longitudinal section backflow barrier, in which provided on the Einsetzkartusche jet nozzle and trapping are formed as separate components,

Fig. 6

the reflux lock off FIG. 5 in a side view,

Fig. 7

the reflux lock off FIGS. 5 and 6 in a plan view,

Fig. 8

the reflux barrier from the FIGS. 5 and 7 in an exploded view of its essential components,

Fig. 9

a reflux barrier in a longitudinal section, in which the insertion cartridge is replaced by a tubular connecting piece, wherein the backflow barrier shown here can prevent a reflux at best via an integrated backflow preventer,

Fig. 10

the reflux lock off FIG. 9 in a side view,

Fig. 11

the reflux barrier from the FIGS. 9 and 10 in an exploded view of its essential components,

Fig. 12

a jet nozzle for a backflow barrier according to the FIGS. 1 to 8 in a perspective view of its essential components,

Fig. 13

the jet nozzle off FIG. 12 in a longitudinal section, wherein the jet nozzle is guided in such a displaceable manner in a sleeve-shaped jet nozzle recording that this jet nozzle with its projecting nozzle opening in the injection position the Can pierce through insertion opening of a membrane, wherein the jet nozzle is shown here in its retracted into the sleeve-shaped jet nozzle recording-Bereitschaftsstellung,

Fig. 14

the jet nozzle in the ready position in a plan view of the membrane to be pierced by the jet nozzle,

Fig. 15

the jet nozzle from the FIGS. 12 to 14 in the injection position of the nozzle opening shown here cut longitudinally,

Fig. 16

the jet nozzle off FIGS. 12 to 15 in an end view onto the jet opening projecting beyond the push-through opening of the membrane,

Fig. 17

the reflux barrier in a schematic longitudinal section in the region of its catching part,

Fig. 18

one according to the FIGS. 1 to 17 configured reflux barrier, which is connected upstream of the tub bottom side water inlet of a bathtub on the inflow side,

Fig. 19

a reflux barrier, which is interposed in the water inlet of an optionally also subsequently attachable to a toilet seat or a toilet ceramic shower,

Fig. 20

the schematically illustrated water supply of in FIG. 19 shown sub-shower, which has a "Shattaf-Shower" designated hand shower, the intermediate backflow barrier is recognizable in the water inlet,

Fig. 21

a further embodiment of a reflux barrier in a longitudinal section, wherein the in FIG. 21 shown reflux barrier similar to that in the FIGS. 1 to 18 formed reflux barrier is formed,

Fig. 22

the reflux lock off FIG. 21 in a perspective detail view,

Fig. 23

the reflux barrier from the FIGS. 21 and 22 in a plan view of the outlet of this reflux barrier,

Fig. 24

in the FIGS. 21 and 23 shown reflux barrier in a side view,

Fig. 25

the reflux barrier from the FIGS. 21 to 24 in a plan view of the outlet facing away from the top,

Fig. 26

the here also longitudinally cut backflow barrier from the FIGS. 21 to 25 , wherein in this reflux barrier, a jet nozzle, which is displaceably guided against a restoring force, is provided, which is shown here in two sliding positions,

Fig. 27

the reflux barrier from the FIGS. 21 to 26 in the opposing sliding positions of their slidably guided jet nozzle,

Fig. 28

the jet nozzle in the FIGS. 21 to 27 shown reflux barrier in a longitudinal section,

Fig. 29

the spray nozzle in the FIGS. 21 to 27 shown backflow barrier in the region of its nozzle opening, and

Fig. 30

the jet nozzle from the FIGS. 28 and 29 in a plan view of the nozzle opening.

In the FIGS. 1 to 30 is a reflux barrier 1, 100 shown in various versions, which may be upstream of a sanitary consumption point, such as a shower or the bathtub inlet of a bathtub upstream. This backflow barrier 1, 100 is intended to prevent a return flow of contaminated water in the drinking water supply network with certainty.

The in the FIGS. 1 to 20 illustrated reflux barrier 1 has a cartridge receptacle 2, which can be integrated, for example, in a shape-adapted recess on the toilet seat. As if from a comparison of FIGS. 1 to 8 becomes clear, in the cartridge receptacle 2 a connectable to an inlet 3 of the cartridge receptacle 2 jet nozzle 4 and a catching part 5 is provided, which has to catch the coming of the jet nozzle 4 via a free jet path 6 liquid jet. While the jet nozzle 4 is connected via the inlet 3 of the cartridge receptacle 2 with the drinking water supply network, the catching part 5 via a flow of the cartridge receptacle 2 with a spray nozzle not shown or the in Fig. 19 and 20 pictured and referred to as "Shattaf-Shower" hand shower 45 connected to a sub-shower. Below the free jet path 6, over which the water is freely guided in the atmosphere as a water jet, an outlet 8 of the cartridge receptacle 2 is provided, which divert a not captured by the catching part 5 liquid subset of the: interior of the cartridge receptacle 2 Has. To the cartridge holder 2, a spacer 68 is integrally formed, the one standard minimum distance between the outlet 8 and a downstream in the flow direction backwater level has to ensure. This spacer 68 is approximately sleeve-shaped in cross-section and has on its longitudinal sides on both sides through-flow openings 69, which are oriented in the longitudinal extension of the spacer 68. These provided on both sides of the longitudinal sides of the spacer 68 through-flow openings 69 give the spacer 68 a cage-like appearance.

The in the FIGS. 1 to 8 shown backflow locks 1 is associated with an insertion cartridge 9, which carries the jet nozzle 4 and the catching part 5. This insertion cartridge 9 is inserted through an insertion opening 10, for example in the in FIG. 1 shown cartridge receptacle 2 can be used and releasably fixed therein, that the jet nozzle 4 is connected to the inlet 3 of the cartridge holder 2. From the FIGS. 1 and 5 It is clear that the Einsetzkartuschen 9 arranged in its between jet nozzle 4 and 5 catching and the free jet path 6 forming or delimiting cartridge section has at least one associated with the outlet 8 of the cartridge receptacle 2 cartridge opening 11. In the case of the insertion cartridge 9 shown here, the cartridge opening 11 and the outlet 8 of the cartridge receptacle 2 adjoin one another directly.

The insertion opening 10, through which the insertion cartridge 9 can be inserted into the interior of the cartridge receptacle 2, can be closed by means of a cap 12, on which the insertion cartridge 9 can be detachably fixed. The cap 12 is here held by means of a plug / rotary connection detachably on the cartridge _- receptacle 2, wherein the plug / rotary connection may be formed, for example, as a bayonet or the like Renkverbindung.

The cap 12 has a cap extension 13, onto which the insertion cartridge 9 can be pushed or pushed with its adjacent, end-side open cartridge end region 14.

The insertion cartridge 9 is thus easy to handle even in confined spaces on the always accessible from the outside cap 12.

The insertion cartridge 9 has at least one inlet 15 which can be connected to the inlet 3 of the cartridge receptacle 2 via an annular space 16 which is enclosed between the inner circumference of the cartridge receptacle 2 and the outer periphery of the cartridge and circumferentially sealed on both sides in the longitudinal direction of the cartridge receptacle 2. The inlet cartridge 9 has here two oval and oriented in the cartridge circumferential direction inlets 15. The inlet 3 of the cartridge receptacle 2 opens in the circumferential direction evenly spaced from the arranged here on opposite sides at the same height inlets 15 in the annular space 16th

From a comparison of FIGS. 1 and 5 on the one hand and the FIGS. 4 and 8th On the other hand, it can be seen that the cap extension 13 is formed by a number of parallel, slightly spaced apart and lamella-like arranged flow guide walls 17. Is the Einsetzkartusche 9 placed on the cap 12, the remaining between the flow guide walls 17 spaces connect the inlets 15 with each other, so that the inflowing through the inlets 15 water streams there collide and: deflect in the cartridge longitudinal direction, where they by the between the adjacent Flow guide walls 17 in the direction of the jet nozzle 4 arranged free passages or openings 18 flow into the cartridge interior.

Between the inlets 15 and the jet nozzle 4, an insertion cartridge 19 is provided, which can be inserted from the end face open cartridge end portion 14 in the cartridge interior. The insertion cartridge 19 has at least one backflow preventer, which allows a flow of water only in the direction of the jet nozzle 4. The Einsetzpatrone 19 also has a flow rate regulator, which has to limit the pressure per unit time flowing through water pressure-independent to a certain value and regulate.

At the in FIG. 5 and 21 in a longitudinal section shown reflux barriers 1, 100, the jet nozzle 4 is guided in a sleeve-shaped jet nozzle receptacle 50 slidably. This jet nozzle receptacle 50 is integrally connected to the catching part 5 via at least one connecting web 51 and preferably two connecting webs 51 arranged parallel to the free blasting path 6.

In the in the FIGS. 21 to 27 shown return flow restrictor 100 form the jet nozzle receptacle 50 and the associated capture part 5 an insertion element 52 which is insertable into a cup-shaped housing 53. For this purpose, the housing 53 has a longitudinal insertion opening 54, through which the insertion element 52 can be inserted.

The insertion element 52 is detachably fixable in the housing 53 such that the insertion opening 54 simultaneously forms the outlet 8. The jet nozzle receptacle 50 can be closed at its end facing away from the jet nozzle 4 by means of a cover 55 which carries an inlet connectable to the inlet. This inlet is formed here as a connection nipple 56 which is connectable via a hose not shown with the inlet. In order to always ensure a sufficient distance between serving as a spout 8 insertion opening 54 and the respective housing base, can be formed on the housing 53 at least one spacer. Preferred is an embodiment, not shown here, in which a plurality of spacers are provided, which are arranged in particular in the housing corner regions.

In the FIGS. 21 and 22 It can be seen that a connection nipple 57 or the like outlet is also integrally formed on the catching part 5 in order to connect the catching part 5, for example via a hose line, to the outlet leading to a point of consumption. In the FIGS. 21 and 22 It can be seen that a groove 58 is provided on the outer peripheral side of the catching part 5 and on the connecting nipple 57 serving as an outlet, into which a wall opening 59 open towards the insertion opening 54 engages on the housing front side of the housing 53. Since the insertion opening defining the wall opening 59 engages in the groove 58, positionally correct positioning of the insertion element 52 formed by the jet nozzle 4 and the catching part 5 is always ensured.

In the FIGS. 21 and 22 It can be seen that a guide wall 60 is integrally formed on the jet nozzle receptacle 50 on the outside. This guide wall 60, on each of which one of the connecting webs 51 engages on both sides, lies in the position of use on a fork-shaped holder 61, which protrudes in the housing interior of the housing 53. The forks 62 of the holder 61 are arranged on both sides at a distance from the nozzle opening of the jet nozzle 4 in order not to impair the proper functioning of the jet nozzle 4. Since the guide wall 60 bears against the holder 61 in the use position, a positionally correct insertion of the insertion element 52 into the housing 53 is likewise ensured. Since the holder 61 is arranged with their forks 62 between the connecting webs 51, a rotational securing of the insertion element 52 in the housing 53 is achieved.

In FIG. 21 is clearly visible that the jet nozzle receptacle 50 frontally occlusive cover 55 in the position of use rests on the inside of the adjacent housing end face of the housing 53. In this case, the connecting nipple 56 formed on the cover 55 passes through a holding opening 70, which is open towards the insertion opening 54, on the housing front side. The holding opening 70 and also the wall opening, which receive the connection nipples 56, 57 in the position of use, have in their opening outline at least on one side and preferably on both sides a recess 71, by means of which the connection nipple 56 or 57 can be releasably latched , The recesses 71 provided on both sides in the opening outline give the holding opening 70 and also the wall opening 59 an opening outline which is comparable to the keyhole provided for a beard key. In this way, a secure hold of the insertion 52 in the housing 53 is ensured.

From the FIGS. 1, 4 . 5, 8 . 21, 22 and 26 It is clear that the jet nozzle 4 is preceded by a conically projecting sieve 20. The screen 20 or a grid is formed so fine mesh that the different over the cross section pressures in the water stream are made uniform.

The jet nozzle 4 of the return flow barriers 1, 100 has to convert the pressure energy of the water coming from the supply network into the kinetic energy of the water jet. For this purpose, it is provided that the flow guide tapers in a funnel shape in the direction of the nozzle opening 21 of the jet nozzle 4. In the area of the nozzle opening 21, the jet nozzle 4 is designed as a nipple-shaped or knob-shaped projection 22 in order to influence the water jet caused by the adhesion forces to minimize.

In the free beam path 6 is at a distance from the capture part 5 and jet nozzle 4 at least one spray or partition wall 23 is arranged, which has a passage opening 24 which has a larger compared to the beam cross section of the liquid jet clear cross-section. In this case, the clear opening cross-section of the passage opening 24 is dimensioned so that the liquid jet unbound from the passage opening 24 and just passes through contactlessly. In order not to interfere with the liquid jet, the spray or dividing wall 23 provided at a distance between the blasting nozzle 4 and the catching part 5 is arranged closer to the catching part 5. In this case, an embodiment is preferred in which the spray or partition wall 23 is spaced at least four millimeters from the catching part 5.

The trapping part 5 is intended to convert the kinetic energy of the water jet coming from the jet nozzle 4 and the trapping part 5 into a corresponding pressure energy which subsequently requires the cleaning or water jet emerging, for example, from the spray nozzle, the hand shower 45 of a sub-shower or other sanitary appliance becomes. From the FIGS. 1 . 5 . 21 and 26 It is clear that the catching part 5 widens in a funnel shape in its clear cross-section. The catching part 5 has a catching opening 28 which, at least in its inflow-side section 25, has a hollow-cylindrical clear opening cross-section. Subsequent to the hollow-cylindrical section 25, the catching part 5 widens in the direction of the outlet. On the outflow side of the hollow cylindrical portion 25, the catching part 5 conically or in the clear cross-section arcuately widening sections 26, 27, of which the inflow-side section 26 a in comparison to the following Part 27 has less expansion.

In the case of the reflux barrier 1, the catching part 5 opens into a cartridge outlet 30 arranged at the end of the cartridge 29, which is provided adjacent to the outlet 7 of the cartridge receptacle 2. The insertion cartridge 9 is circumferentially sealed in the region of the cartridge end 30 having cartridge end 29 relative to the circumference of the cartridge receptacle 2.

The insertion cartridge 9 of the backflow barrier 1 can be used and fixed in the cartridge receptacle 2 such that the blasting nozzle 4 is connected to the inlet 3 of the cartridge receptacle 2 and at the same time the catching part 5 is connected to the outlet 7 of the cartridge receptacle 2. The insertion cartridge 9 of the return flow barrier 1 has at least one cartridge opening 11 in its cartridge section which is arranged between the jet nozzle 4 and the catching part 5 and delimits the free jet path 6 and which communicates with the outlet 8 of the cartridge receptacle 2. By loosening the Einsetzkartusche 9 from the cartridge holder 2 and replacing this Einsetzkartusche 9, the return flow barrier 1, the cartridge holder 2, for example, in a toilet seat, a toilet ceramics or a bathtub formed or - as here - as a housing can be formed into a corresponding receptacle on the toilet seat, on the toilet ceramics or on the trough opening of a bathtub, with little effort to adapt to a variety of predetermined conditions such that always an optimal function is guaranteed. By loosening the insertion cartridge 9 from the cartridge holder 2, the backflow barrier 1 is also easy to clean and to descale if necessary.

The in the FIGS. 1 to 4 . 5 to 8 and 21 to 27 illustrated embodiments of the return flow lock 1, 100th differ only in that in the in FIGS. 5 to 8 As shown embodiment, the jet nozzle 4 on the one hand and the catching part 5 on the other hand each configured as a releasably insertable into the insertion cartridge 9 component. Due to the design of jet nozzle 4 and trapping 5 as a separate component, the modular design of in FIGS. 5 to 8 shown backflow barrier 1 favors that optionally also by replacing the jet nozzle 4 and / or the catching part 5, the insertion cartridge 9 can be adapted to the respective conditions of the existing on-site supply network.

Since in the other reflux barriers 1, 100 of the free jet path 6 of the insertion cartridge 9 and the insertion element 52 forming portion is formed only by the two longitudinally oriented connecting webs 51, the insert cartridge 9 of the backflow barrier 1 and the insert 52 of Reflux barrier 100 formed open in the region of this free beam path 6. So that the backflow barriers 1, 100 can dry again quickly after each use, at least one ventilation opening is provided in the area of the free jet path 6.

In the return flow lock 1 are on the outlet 8 of the cartridge holder 2 opposite side of in Figure 1 to 8 shown cartridge receptacle 2 to slot-shaped ventilation openings 37 are provided, which run like a labyrinth through the wall of the cartridge holder 2. In contrast, the housing 53 of in FIG. 21 shown reflux barrier 100 two slot-shaped ventilation openings 63, which are arranged on the insertion opening 54 facing away from the longitudinal side. These two slot-shaped ventilation openings 63 are oriented parallel to one another and at a distance from each other in the housing longitudinal direction. There the connecting webs 51 of the insertion element 52 located in the housing 53 project into a plane imagined by the slot-shaped ventilation openings 63, a labyrinth-like air guide through the ventilation openings 63 is also achieved in the return flow barrier 100.

The backflow barriers 1, 100 shown here provide maximum safety in order to prevent the return of contaminated water into an area connected to the drinking water supply network. In order to be able to use the reflux barrier 1, 100 also where such a high level of safety is not required, it is possible to replace the insertion cartridge 9 of the backflow barrier 1 in the cartridge receptacle 2 with a sleeve-shaped connecting piece 31 which supports the bridged free beam path and the inlet 3 of the cartridge receptacle 2 with the outlet 7 of the cartridge receptacle 2 optionally with the interposition of a Einsetzpatrone 19 which has at least one Rückflussverhinderer connects.

From the FIGS. 9 to 11 It is clear that the modular design of the reflux barrier 1 facilitates the replacement of the insertion cartridge 9 against a corresponding connector 31. From a comparison of FIGS. 9 and 11 It is clear that the sleeve-shaped connecting piece 31 is placed with its open front end on the cap extension 13 of the cap 12 such that lateral inlet openings 32 are connected via the annular space 16 with the inlet 3 of the cartridge receptacle 2. In this case, the inserted into the connecting piece 31 Einsetzpatrone 19 between the cap extension 13 and a arranged on the inner circumference of the connecting piece 31 annular shoulder 33 is secured.

In the FIGS. 12 to 15 and 21 to 27 is at least the jet nozzle 4 having portion of a deviating designed return flow barrier 1, 100 shown. Like from the FIGS. 12 to 15 and 21 to 27 can be seen, the jet nozzle 4 is guided displaceably in the jet nozzle receptacle 50 and of a in. In this deviating designed return flow restrictor 1, 100 FIGS. 13 and 14 shown ready position under the pressure of the liquid flowing through against a restoring force in a spray position displaced in which injection position - like FIGS. 15 and 16 or 26 and 27 show - the jet nozzle 4 with its nozzle opening 21 forming and formed as a projection 22 nozzle portion pierces a provided in an elastic membrane 35 through opening 36. While at the in the FIGS. 15 and 16 shown embodiment, the restoring force is applied by a return spring 34 to the jet nozzle 4, forms in the in FIGS. 26 and 27 shown embodiment, the elastic material and / or the elastically flexible shape of the elastic membrane 35 acting on the spray nozzle 4 return element.

In FIGS. 26 and 27 It can be seen that the jet nozzle 4 protrudes into the here cup-shaped membrane 35, which carries the insertion opening 36 at the pot bottom of their pot shape. In this case, the peripheral edge of the membrane 35 facing away from the bottom of the pot is supported elastically on the jet nozzle 4. In the FIGS. 26 and 27 It can be seen that the membrane 35 seals the jet nozzle receptacle 50 in the region of an opening provided in the guide wall 64 in the region of the pot bottom of their pot shape and that the membrane 35 at the periphery of its cup shape at least one flow opening and preferably a plurality of spaced apart flow openings 65 which slit-shaped and oriented in the circumferential direction. These flow openings 65 connect the interior 66 of the jet nozzle receptacle 50 with the interior 67 of the cup-shaped membrane 35, so that a fluid exchange between these interior spaces 66, 67 during the sliding movement of the jet nozzle 4 is made possible. To counteract an evaporation-related calcification of the jet nozzles 4 in the region of its nozzle opening 21, it is provided that the jet nozzle 4 in its in FIG. 27 The standby position shown on the left is surrounded or lapped by water.

FIG. 17 shows a backflow barrier according to the invention in a schematic partial longitudinal section in the region of their catching part 5. Aus FIG. 17 It is clear that the catching part 5 protrudes nipple-shaped or knob-shaped on the outer peripheral side in its section delimiting the catching opening 28. Furthermore, in FIG. 17 shown that the catching part 5 has a hollow cylindrical or approximately hollow cylindrical section in the region of its catching opening 28. It may be advantageous if the ratio of the length l _{1 of} this section in comparison to the clear inner diameter of the capture opening is preferably greater than / equal to 0.2 to less than / equal to 10, in particular greater than / equal to 1.5 to less than / equal to 2.6 , In FIG. 17 It can also be seen that the catching part 5 preferably widens in a funnel shape following the hollow cylindrical part. It is provided that the catching part on the outflow side of its hollow cylindrical portion 25 has at least one in the flow direction conically widening portion 26, 27 and that the immediately adjacent to the hollow cylindrical portion section has a length l ₂ from 0 to 100 mm inclusive, preferably from 0 to 30 mm inclusive. In this case, the embodiment shown here is preferred in which the catching part 5 has at least two sections 26, 27 which flare in the direction of flow, wherein at least two downstream sections 26, 27 have the length l ₃ of at least the downstream and preferably more extensive section 0 to 100 mm, preferably from 0 to 30 mm.

In FIG. 17 It can also be seen that the catching part 5 has an angle a ₂ of greater than / equal to 0 to less than / equal to 45 °, preferably greater than / equal to 0 to less than / equal to 18 °, in the region of its more conically widening section 27 with respect to the longitudinal axis of the catching part , It should of more strongly widening conically between this section 27 and the hollow cylindrical portion 25 provided partial section of the Einfangteiles 5, which has a smaller taper angle a ₁ relative to the capturing member longitudinal axis of greater than / equal to 0 to less than / equal to 45 °, preferably from greater than or equal to 0 to less than or equal to 13 °.

This preferred range in the embodiment of the catching part 5 is reproduced again in the table below: Closest interpretation Widest interpretation l ₁ / d 1.5 ≤ l ₁ / d ≤ 2.6 0.2 ≤ l ₁ / d ≤ 10 l ₂ [mm] 0 ≤ l ₂ ≤ 30 0 ≤ l ₂ ≤ 100 l ₃ [mm] 0 ≤ 13 ≤ 30 0 ≤ 13 ≤ 100 a ₁ (in degrees) 0 ≤ a1 ≤ 13 0 ≤ a1 ≤ 45 a ₂ (in degrees) 0 ≤ a2 ≤ 18 0 ≤ a2 ≤ 45

The backflow barrier 1 shown here can be connected upstream of a shower and, in particular, the sub-shower assigned to a toilet seat on the inflow side. In addition, however, it is also possible for the return flow lock 1 upstream of the water inlet of a bath 38 on the inflow side. From the schematic representation in FIG. 18 It is clear that in the bath 38 shown here, the bath enema 39 and the bath spout 40 is provided separately from each other on the tub bottom of the bath 38. But it is also possible to merge the bathtub inlet 39 and the bath spout 40 in a common trough opening. As well as the bath inlet 39 is arranged in any case below the water surface of the bathwater located in the bath 38, the bath water can splash-free and quietly enter the bathtub 38. However, since the water pressing on the incoming water and the bathtub inlet 39 also carries the risk that contaminated bathing water or service water flows into the water supply network, in the case of FIG. 18 shown application example to ensure an effective inlet protection necessarily.

The water inlet into the bath 38 is operated via a manually operable outlet fitting 41, which combines a hot water inlet 42 and a cold water inlet 43 in it. After the water coming from the outlet fitting 41 has reached the backflow barrier 1, the water flowing through can pass through a backflow preventer 44 interposed between the backflow barrier 1 and the bath inlet 39, before the water in the bathtub inlet 39 flows into the bathtub 38 on the bottom side.

In the schematized representations according to the Figures 19 and 20 It can be seen that the backflow barrier 1 according to the invention can also be interposed in the example leading to a hand shower 45 water inlet 49 of a schematically indicated below shower, which sub-shower in the toilet ceramic or in the toilet seat, where appropriate, also installed later.

As already stated above, the jet nozzle 4 is in the FIGS. 21 to 27 shown reflux barrier 100 in the jet nozzle receptacle 50 slidably guided. The jet nozzle receptacle 50 is configured on its side facing away from the nozzle opening 21 with the help of the lid 55 openable. By closed in the position of use by means of the lid 55 insertion opening of the jet nozzle receptacle 50, the jet nozzle 4 can be inserted into the interior of the jet nozzle receptacle 50. In the FIGS. 26 and 27 It can be seen that the jet nozzle 4 in the backflow barrier 100 is displaceable from the ready position shown left to the longitudinal axis under the pressure of the liquid flowing through against a restoring force in the right shown spray position, in which injection position the jet nozzle 4 with its nozzle opening 21 forming Nozzle section pierces the opening provided in the elastic membrane 35 through opening 36. The here substantially conical jet nozzle 4 here has an approximately centrally disposed annular shoulder on which the cap-shaped membrane 35 is supported. The membrane 35, which is here cup-shaped and made of elastic material, is shaped such that it exerts the restoring force on the displaceably guided jet nozzle 4. The sliding path of the jet nozzle 4 in the jet nozzle receptacle 50 is limited on the one hand by a screen 20 upstream of the jet nozzle 4 and on the other hand by an annular shoulder 47 on the inner periphery of the jet nozzle receptacle 50.

In the FIGS. 28 to 30 is the jet nozzle 4 in the FIGS. 21 to 27 shown reflux barrier 1 shown. As if from a general view of the FIGS. 28 to 30 becomes clear, the jet nozzle 4 in the region of its nozzle opening 21 on an annular shoulder. To the jet nozzle 4, an annular projection 22 is integrally formed, which surrounds the nozzle opening 21. The nozzle opening of the Blasting nozzle 4 delimiting opening edge is sharp-edged and designed to chamfer and roundness. For this purpose, the opening edge of the nozzle opening 21 has an edge degree smaller than 0.1 mm or greater minus 0.1 mm. Since the nozzle opening and the nozzle opening delimiting opening edge is arranged in the flow direction in front of the annular projection 22 and since the annular projection 22 thus protects the Scharfkantigkeit of the nozzle opening 21 bounding boundary edge, in the production of the spray nozzle 4 possibly occurring damage to the nozzle opening 21 and its sharp-edged opening edge avoided. The sharp-edged opening edge forms an inner peripheral side provided tear-off edge, which favors a sharply shaped in the jet nozzle 4 and non-splashing liquid jet.

LIST OF REFERENCE NUMBERS

1

Reflux barrier (according to the FIGS. 1 to 20 )

2

Cartridge accommodating

3

Inlet (of the cartridge holder 2)

4

jet

5

capturing member

6

beamline

7

Procedure (Cartridge Recording 2)

8th

outlet

9

Einsetzkartusche

10

Insertion opening (the cartridge holder 2)

11

cartridge opening

12

cap

13

Cap extension

14

Cartridge end portion

15

cartridges inlet

16

annulus

17

Flow guide walls

18

Through opening

19

insertable

20

scree

21

nozzle opening

22

Projection (the jet nozzle 4)

23

Spray or dividing wall

24

Radiation opening (in the spray or dividing wall)

25

(hollow cylindrical) section

26

(conically formed) section

27

Part or transition section (with less conicity)

28

capture opening

29

Cartridge end

30

cartridge expiration

31

(sleeve-shaped) connector

32

inlet openings

33

annular shoulder

34

Return spring

35

membrane

36

Through opening

37

ventilation opening

38

bathtub

39

bath inlet

40

tub spout

41

outlet fitting

42

Hot water supply

43

Cold water supply

44

Backflow preventer

45

Handheld shower

47

annular shoulder

48

shut-off

49

water supply

50

Jets shooting

51

connecting web

52

inserter

53

casing

54

insertion

55

cover

56

Connection nipple (as inlet)

57

Connection nipple (as outlet)

58

groove

59

wall opening

60

guide wall

61

bracket

62

Fork (the holder 61)

63

Ventilation opening (the reflux barrier 100)

64

Opening (in the guide wall 60)

65

Flow opening

66

Interior (the jet nozzle receptacle 50)

67

Interior (the cup-shaped membrane 35)

68

spacer

69

flow-through

70

holding opening

71

return

100

Reflux barrier (according to the FIGS. 21 to 27 )

Claims (10)

1. Backflow inhibitor (1, 100) which has a jet nozzle (4) connectable to a flow entrance (3), which jet nozzle has a flow guide which narrows in funnel-shaped form in the direction of a nozzle opening (21) of the jet nozzle (4) and is designed as a nipple-like or stud-like projection (22) in the region of the nozzle opening (21), and has a capture part (5) which has the task of capturing the liquid jet that passes over a free jet path (6) from the jet nozzle (4), which capture part is connectable or connected to a flow exit (7; 57) and to an outlet (8) arranged below the free jet path (6), which outlet (8) has the task of discharging a partial amount of liquid that is not captured by the capture part (5), wherein, in the free jet path (6), at a distance from the jet nozzle (4) and from the capture part (5), there is arranged at least one spray wall or partition (23), which spray wall or partition (23) has a jet passage opening (24), wherein the jet passage opening (24) provided in the spray wall or partition (23) has a clear opening cross section larger than the jet cross section of the liquid jet, and wherein the clear opening cross section of the jet passage opening (24) is dimensioned such that the liquid jet passes through said jet passage opening without being focused by the latter and without making contact, characterized in that the capture part (5) projects in nipple-like or stud-like form in the region of the capture opening.
2. Backflow inhibitor (1, 100) according to Claim 1, characterized in that the spray wall or partition (23), which is provided at a distance between the jet nozzle (4) and capture part (5), is arranged closer to the capture part (5).
3. Backflow inhibitor according to Claim 1 or 2, characterized in that the capture part (5) has a capture opening (28) which has a hollow cylindrical section (25), the outflow side of said hollow cylindrical section being adjoined by at least one subsection which is conical or which widens in arcuate fashion in terms of clear cross section, and preferably by at least two such subsections (26, 27), of which the inflow-side subsection (26) widens to a lesser degree than the subsequent subsection (27).
4. Backflow inhibitor according to one of Claims 1 to 3, characterized in that the jet nozzle (4) is guided displaceably in the backflow inhibitor (1, 100) and is displaceable from a standby position into a spray position, in which spray position the jet nozzle (4) extends, by way of its nozzle section bordering the nozzle opening (21), through a push-through opening (36) which is provided in an elastic diaphragm (35) or is closed by a flap in the standby position.
5. Backflow inhibitor according to Claim 4, characterized in that a sleeve-shaped jet nozzle receptacle (50) is provided in which the jet nozzle (4) is displaceably guided, and wherein the jet nozzle receptacle (50) is connected to the capture part (5) via at least one connecting web (51) .
6. Backflow inhibitor according to one of Claims 1 to 5, characterized in that the annular projection (22) which surrounds the nozzle opening (21) is integrally formed on the jet nozzle (4).
7. Backflow inhibitor according to one of Claims 1 to 6, characterized in that an insert cartridge (9) is provided which bears the jet nozzle (4) and the capture part (5), in that the insert cartridge (9) can be inserted into an insertion opening (10) of a cartridge receptacle (2) and, when in a usage position, is held there such that the jet nozzle (4) is connected to the flow entrance (3) and the capture part (5) is connected to the flow exit, and in that the insert cartridge (9), in the cartridge section which is arranged between jet nozzle (4) and capture part (5) and which forms or delimits the free jet path, has at least one cartridge opening that can be connected to the outlet (8).
8. Backflow inhibitor according to Claim 7, characterized in that the insert cartridge (9) has at least one cartridge inlet (15), wherein the at least one cartridge inlet (15) can be connected to the flow entrance (3) of the cartridge receptacle (2) via an annular chamber (16) which is bounded between the inner circumference of the cartridge receptacle (2) and the cartridge outer circumference and which is sealed off in an encircling manner on both sides in the longitudinal direction of the cartridge receptacle (2) .
9. Backflow inhibitor according to Claim 7 or 8, characterized in that the capture part (5) ends or opens out in a cartridge flow exit (30) arranged at a face-side cartridge end, in that the cartridge flow exit (30) is adjacent to the flow exit (7), wherein the flow exit (7) is provided on the cartridge receptacle (2), and in that the insert cartridge (9) is, in the region of its cartridge end (29) that has the cartridge flow exit (30), sealed off in encircling fashion with respect to the inner circumference of the cartridge receptacle (2).
10. Backflow inhibitor according to one of Claims 7 to 9, characterized in that, on the outlet (8) of the cartridge receptacle (2), there is provided a spacer (68) which ensures a minimum distance between the outlet (8) and a backwater level.

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