EP2980327B1 - Vacuum breaker for a bidet - Google Patents

Description

The invention relates to a backflow preventer, which has a jet nozzle which can be connected to an inlet and 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 with a Spout arranged below the free jet path, which spout has to discharge a liquid subset not trapped by the trapping member, the trapping member having a trapping opening having a hollow cylindrical clear opening cross section at least in its upstream portion, and wherein the trapping member is subsequent to its hollow cylindrical Broadened section in the direction of the flow and at least on the downstream side of the hollow cylindrical portion, a conically widening portion has.

The invention also deals with the use of the aforementioned backflow barrier.

Showers in toilets are operated with water from the general supply network. To protect the general supply network, from which the in the toilets integrated Unterduschen be fed, against the penetration of pathogenic germs a permanently 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. As the pressure on the incoming water and the tub opening; However, bathing water already contained in the bathtub involves the risk that contaminated bath or service water flows into the water supply network, an effective inlet safety and return flow barrier must be ensured in this application example.

From the CH-PS 444 076 For example, a backflow barrier is already known which has a housing in which 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 case is Also provided is a catching part which has to catch the liquid jet coming from the jet nozzle via a free jet path. 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.

A jet which is misdirected next to the capture opening of the capture part can splash on impact such that contaminated liquid droplets are unintentionally thrown back into the area of the jet nozzle.

From the US 2071004 A is already a backflow barrier of the aforementioned kindvorbekannt, which has an inflow-side and a far-downstream outflow line section, which line sections are connected to each other via a free jet or path brought into contact with the atmosphere, so that in the inflow-side line section pending vacuum in Area of the free jet route is reduced or completely prevented, which could otherwise suck back dirty water in the pipe network. In this case, the inflow-side line section constitutes a jet nozzle and the outflow-side line section constitutes a capture part, which single part has to recapture the liquid jet coming from the jet nozzle. The outflow-side and serving as a capture part line section has a capture opening, which has a hollow cylindrical clear opening cross-section in its inflow-side portion, wherein the catching part extends after the hollow cylindrical portion toward the outlet and on the downstream side of the hollow cylindrical portion a conical expanding subsection has. The installation position of the prior art backflow barrier is aligned with a vertically aligned arrangement and the free jet path formed between the conduit sections is bounded by an outer circumferential wall which redirects laterally deflected liquid drops back to the capture port. Although the previously known backflow barrier can effectively prevent a sucking back of dirty water, - a contamination of the Tap water by spraying back splashed liquid drops is not necessarily prevented ..

In the backflow barrier of the type mentioned above, the object is 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 losses and to avoid unnecessarily strong spraying of the liquid 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.

It is therefore an object to provide a reflux barrier of the type mentioned, whose catching part is able to capture the liquid jet without major energy and pressure losses.

The achievement of this object is in the backflow barrier of the type mentioned in that connect to the hollow cylindrical portion of the Einfangteiles at least two, conically widening sections e, of which the inflow-side section compared to the subsequent section lower expansion in the sense has a lower conicity.

In order 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 is provided in the backflow barrier according to the invention that the catching part following its hollow cylindrical portion in the direction of Expiration expanded. On the hollow cylindrical Section of the trapping close to this at least two sections, of which the inflow-side section has a lower than in the subsequent section lower expansion in the sense of a lower conicity.

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 has a nozzle opening and that the jet nozzle and the trapping part in their dimensions according to the formula below $$\frac{\begin{array}{l}\mathrm{Diameter\; of\; the}\\ \mathrm{capture\; opening}\end{array}}{\mathrm{Diameter\; of\; the\; nozzle\; opening\; of\; the\; jet\; nozzle}}={\mathrm{<figure-callout\; id="1"\; label="Q"\; filenames="imgf0001.png,imgf0003.png"\; state="\{\{state\}\}">Q</figure-callout>}}_1$$

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.
Bevorzugte Anwendungsbeispiele für die gemäß der oben beschriebenen Erfindungen ausgestaltete Rückfluss-Sperre sehen vor, dass die Rückfluss-Sperre einer sanitären Verbrauchsstelle zuströmseitig vorgeschaltet ist, und dass die sanitäre Verbrauchsstelle vorzugsweise eine Unterdusche oder ein bodenseitiger Wassereinlauf eines Waschbeckens oder einer Badewanne ist. Die erfindungsgemäße Rückfluss-Sperre lässt sich aber auch beispielsweise den in einem Krankenhaus vorgesehenen Verbrauchsstellen vorschalten, um eine Kontaminierung des Leitungswassers durch Keime mit Sicherheit zu verhindern.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.
Preferred application examples for the configured according to the inventions described above backflow preventer provide that the backflow barrier of a sanitary Verbrauchsstelle upstream upstream, and that the sanitary consumption point preferably a sub-shower or a bottom side Water inlet of a sink or a bathtub is. However, the reflux barrier according to the invention can also be used, for example, in front of 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 Rückfluss-Sperre 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 Durchstecköffnüng 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 Rückffluss-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 longitudinally-sectioned backflow barrier with a cartridge receptacle into which is inserted an insertion cartridge carrying a jet nozzle and a catching part catching the steel coming from the jet nozzle via a free jet path;

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 similarly designed and also shown here in a longitudinal section Reflux barrier, in which the jet nozzle and catching part provided on the insertion cartridge are designed 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 in a sleeve-shaped Jet nozzle recording is guided so displaceable that this jet nozzle can pierce the Durchstecköffnüng a membrane with its projecting nozzle opening in the spray position, wherein the jet nozzle is shown here in its retracted into the sleeve-shaped jet nozzle recording standby position,

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 return flow lock out of the FIGS. 21 to 26 in the opposing sliding positions 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 a Unterdusche connected. Below the free jet path 6, over which the water is guided as a water jet freely in the atmosphere, an outlet 8 of the cartridge receptacle 2 is provided, which has to divert a not captured by the capture part 5 Flüβigkeits subset from the interior of the cartridge receptacle 2 , To the cartridge holder 2, a spacer 68 is integrally formed, which has to ensure a standard minimum distance between the outlet 8 and a downstream in the flow direction backflow level. 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, is by means of a cap 12 closed, on which the insertion cartridge 9 is detachably fixable. The cap 12 is here releasably held by means of a plug / rotary connection to 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. If the insertion cartridge 9 is placed on the cap 12, the remaining between the flow guide walls 17 connect Interspaces the inlets 15 with each other, so that the inflowing through the inlets 15 water streams collide there and deflect in the cartridge longitudinal direction, where it passes through the between the adjacent flow guide walls 17 in the direction of the jet nozzle 4 arranged free passages or openings 18 in the cartridge interior stream.

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 an outlet 8 insertion opening 54 and the respective housing base, at least one spacer may be formed on the housing 53. 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, acts on both sides of each of the connecting webs 51, is in the use position of a fork-shaped holder 61, in the housing interior of the housing 53 protrudes. 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 region of the nozzle opening 21, the jet nozzle 4 is designed as a nipple or knob-shaped projection 22 in order to minimize the effects on the water jet caused by the adhesion forces.

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 trapping 5 to it in his light Cross-section widens funnel-shaped. 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 section 25, the catching part 5 has conically widening sections 26, 27, of which the inflow-side section 26 has a smaller expansion in the sense of a smaller conicity compared to the subsequent section 27. In the return flow barrier 1, the catching part 5 opens into a cartridge outlet 30 arranged at the front-side cartridge end 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 backflow barrier 1, 100 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.

At the reflux lock. 1 are on the side facing away from the outlet 8 of the cartridge receptacle 2 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. Since the connecting webs 51 of the insertion element 52 located in the housing 53 protrude into a plane imagined by the slot-shaped ventilation openings 63, a labyrinthine 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 holder 2 with the outlet 7 of the cartridge holder 2 optionally with the interposition of a Einsetzpatrone 19, which has at least one backflow preventer 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 At least the portion of a deviating designed return flow restrictor 1, 100 is the jet nozzle 4 having 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 at the pot bottom of their pot shape the insertion opening 36th wearing. 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 envisaged that the catching part on the outflow side of its hollow cylindrical portion 25 has at least one section 26, 27 flared in the flow direction and that the section immediately adjoining the hollow cylindrical section has a length l ₂ of 0 to 100 mm inclusive, preferably 0 to 30 inclusive mm. 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 ≤ l3 ≤ 30 0 ≤ l3 ≤ 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 bathtub inlet 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 bathtub 38 is via a manual operable outlet fitting 41 operated, which combines a hot water inlet 42 and a cold water inlet 43 in itself. After the water coming from the outlet fitting 41 has reached the reflux barrier 1, the water flowing through can have a backflow preventer interposed between the backflow barrier 1 and the bath inlet 39. 44 pass before the water in the bathtub inlet 39 bottom side flows into the bath 38.

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 backlash 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 essentially cone-shaped 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 the jet nozzle 4 of the reflux barrier 1 shown in FIGS. 21 to 27 is depicted. 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 jet nozzle 4 bounding opening edge is sharp-edged and designed to chamfer and rounding. 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-squirting 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 (4)

1. Backflow inhibitor (1, 100) which has a jet nozzle (4), which can be connected to a flow entrance (3), and a capture part (5) which is to capture the liquid jet passing over a free jet path (6) from the jet nozzle (4) and is or can be connected to a flow exit (7; 57), and having an outlet (8) arranged below the free jet path (6), said outlet (8) is to discharge a partial amount of liquid which is not captured by the capture part (5), wherein the capture part (5) has a capture opening (28) which, at least in its inflow-side portion (25), has a hollow-cylindrical clear opening cross-section, and wherein the capture part (5), adjacent to its hollow-cylindrical portion (25), widens in the direction of the flow exit (7) and in addition has, on the outflow side of the hollow-cylindrical portion (25), at least one sub-portion (26) which widens in a conical manner, characterised in that the hollow-cylindrical portion (25) of the capture part (5) and the conically extending sub-portion (26) are adjoined by a further conically extending sub-portion (27), wherein the inflow-side sub-portion (26) has a widening in terms of a smaller conicity, which is smaller than the subsequent sub-portion (27).
2. Backflow inhibitor as clamed in claim 1, characterised in that the jet nozzle (4) has a nozzle opening (21) and in that the jet nozzle (4) and the capture part (5) are adapted to one another in terms of their dimensions according to the following formula: $$\frac{\mathrm{diameter\; of\; the\; capture\; opening}\left(28\right)}{\begin{array}{l}\mathrm{diameter\; of\; the\; nozzle\; opening}\left(21\right)\mathrm{of\; the\; jet}\\ \mathrm{nozzle}\end{array}}={\mathrm{Q}}_1$$

   

   with the proviso that the quotient Q₁ is 1 to 5, preferably 1.0 to 2.0 and in particular 1.0 to 1.34.
3. Backflow inhibitor as claimed in claim 1 or 2, characterised in that the ratio of the length (1) of the hollow-cylindrical sub-portion (25) of the capture part (5) to the opening cross-section of the capture opening (28) is adapted according to the following formula: $$\frac{\begin{array}{l}\mathrm{length}\left({\mathrm{l}}_1\right)\mathrm{of\; the\; hollow-cylindrical\; sub-}\\ \mathrm{portion}\left(25\right)\mathrm{of\; the\; capture\; part}\left(5\right)\end{array}}{\mathrm{diameter}\left(\mathrm{d}\right)\mathrm{of\; the\; capture\; opening}\left(28\right)}={\mathrm{Q}}_2$$

   

   with the proviso that the quotient Q₂ is a minimum of 0.2 and a maximum of 10 and preferably is a minimum of 1.58 and a maximum of 2.6.
4. Use of a backflow inhibitor as claimed in any one of claims 1 to 3, characterised in that the backflow inhibitor (1, 100) is connected, on the inflow-side, upstream of a sanitary point of use, and in that the sanitary point of use is preferably an upwardly directed douche or the base-side water inlet of a wash basin or of a bathtub.

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