EP2995731A1 - Water outlet with multiple siphon odour trap - Google Patents

Abstract

The invention relates to a water drain, for example, for floor drains in the sanitary area, such as showers, with a multiple siphon trap, which has an air duct between an internal air area and a peripheral air area.

Description

The present invention relates to a water drain, for example, for the sanitary area, such as a floor drain for a shower.

Such water drains are already known for a long time, in particular floor drains for showers. In addition to the main function, water from an area, such as the shower tray or a floor, dissipate and divert into a sewer network, they have in most cases the task of providing an odor trap. From the sewer network unpleasant odors are expected, which can be shut off by a so-called siphon, so a water pipe in a correspondingly curved wiring. This odor trap function requires certain safety margins with regard to expected evaporation from the siphon and with regard to pressure fluctuations in the pipe network, which shift the two water levels in the siphon against each other and thus in principle can push gases from the sewer network through the siphon into the room in which the water drain is mounted. Accordingly, there are various regulations and standards, for example. EN 1253, which requires, taking into account a certain evaporation loss, the maintenance of an odor trap in a series of vacuum conditions in the sewer network with a pressure of 400 Pa and a subsequent overpressure at the same level.

These and other standards are usually taken into account by the fact that the sealing water level in the siphon, so the height difference between the water level in the siphon and the highest possible gas passage point, has a certain minimum size, z. B. at least 50 mm. Furthermore, double siphon odor closures have already been proposed and introduced into practice, which (in the sense of the water flow through the water outlet) have, so to speak, two siphon structures in series connection one behind the other. With regard to the effective sealing water level, one divides the sealing water level, in simple terms in two parts. The corresponding water drains can thus be carried out with a comparatively reduced overall height, which is of great advantage in various situations. For example. It is desirable in the planning of showers, by forcing a floor drain under a shower tray not to enforce a floor height otherwise not required in the building. In some cases, restrictions are also no longer to be changed in the planning boundary conditions, especially in the renovation of old buildings. In terms of height reduced double siphon odor trap is so far interest.

On this basis, the invention is based on the problem of specifying an improved with regard to the reliability of the function of the odor trap water drain with multiple siphon trap.

This problem is solved by a water outlet with an inlet-side drain pot, a drain line connected thereto and a multiple siphon trap, which has an internal air area, characterized in that between the internal air area and an edge air area in the water drain at an inlet side and / or a drain side of the Water drain is provided an air duct,
preferred embodiments being indicated in the dependent claims. These will be explained in detail below as well as the basic idea of the invention, wherein the individual features within the scope of the current claim 1 are essential to the invention in other combinations; this also applies to the embodiment.

The basic idea of the invention consists in an air channel between an edge-side air area in the water outlet and an internal air area. The internal air area is the air area enclosed between the two siphon structures, which of course refers to an idle state without external pressure difference along the water drain and when the individual siphon structures are completely filled. The marginal air area is either the air area upstream of the inlet (first) siphon or the air area in the sewage pipe system behind the drain (last) siphon.

In the preferred case, the invention relates to a double siphon, which is why in the following without loss of generality of a first and second siphon and the air area between them is mentioned. In principle, however, the invention also applies to three or more siphons in series and then relates as an internal air region (at least) to an air region adjoining the first or the last siphon (on the inside).

In the case of three or more serial siphon structures, a corresponding plurality of air ducts are also possible, with a siphon structure basically being to be retained as a completely effective odor trap and therefore not being "short-circuited" with an (albeit small) air duct. In the double siphon case, therefore, there is preferably only one air channel.

This air channel comes v. a. then to the function, if it comes in the operation of the water drain after some time to a partial or complete flushing of the air cushion from said air area, so to an approximate or actual full filling of the double siphon trap. Practice shows that in such cases there is a risk that the entire double siphon odor trap completely or very largely emptied and thus its function is restricted or canceled. This can z. B. happen when the drain side relatively sudden a certain negative pressure, so that the water column not only sucked something, but it is also provided with a significant impulse. Then the water column can migrate further due to the inertia, as can be explained by the (hydrostatic) pressure amplitude, and thus leak the odor trap.

As a result of the air duct, however, the air cushion can regenerate in the aforementioned internal area and the described effect of the extensive or actual Fullfilling rarely or never has the feared effects. For this purpose, it is sufficient that the air channel in the already mentioned rest state without external pressure difference and full filling of the siphon structures and, of course, in the correct mounting position opens only slightly above the water level of the affected siphon, so only slightly above this water level has access. If the water levels in the siphon are shifted by a pressure difference against each other, so that access to the air duct or the entire air duct filled with water and sealed so that the water level in the siphon can contribute to the stability of the entire multiple siphon trap against such pressurization , Preferably, the entrances to the air duct open within a maximum of 5 mm, and in the following order increasingly preferably 4 mm, 3 mm, 2 mm, 1 mm above the equilibrium water level at rest.

In addition, the air duct is preferably of a small cross-section, because there is enough time for its function according to the invention. However, it is just a small flow cross-section desirable, firstly for the reasons mentioned above, namely, because a small flow cross-section is connected to a small height of the air duct relative to the water level. Secondly, a relatively large air flow resistance through the air duct is desired, so that in the case of pressure fluctuations in the sewer line, the air duct does not lead to shorting of the corresponding siphon stage. Instead, due to the flow resistance caused by the pressure difference, a shift in the water level at the siphon, resulting in the air duct closes. In this sense, a flow cross-section (again based on the rest state at full filling) of at most 10 mm ² and in the following order increasingly preferred at most 8 mm ² , 6 m ² , 4 mm ² , 2 mm ² strive.

In principle, the invention can be used in multiple siphon trap valves of different types. Preference is given to "horizontal" odor traps, in which therefore the individual siphon structures are adjacent to one another. This is understood to mean that they are in horizontal projection (in installation position) have an overlap of the nominal water levels (ie when fully filled at rest and in the intended installation position). These stench traps are advantageous for the already mentioned area of limited height water drains.

The air duct according to the invention may in principle be provided between the internal air area and either the inlet side or the outlet side; However, an air duct between the internal air area and the outlet side is preferred. In particular, this speaks in favor of the fact that the access opening of the air duct at the input-side drain pot in the construction then does not conflict with there also necessary assembly or sealing devices, the v. a. With a limited overall height already in the area directly above the nominal water level can be provided. For the sake of illustration, reference is made to the exemplary embodiment.

The odor trap according to the invention is preferably in one piece, at least in terms of its outer walls, so apart from operations. For example. it may be a plastic blower, which shows the embodiment.

The air duct itself, d. H. its limitation does not necessarily belong to the one-piece part; In particular, it is conceivable that one part has connection possibilities for a piece of tubing or a piece of pipe which limits the air duct and, if necessary, can also be removed. However, an integrated design of the air duct in the one-piece odor trap is preferred.

Furthermore, preferably no siphon insert (ie for the separation of the two water columns of a siphon stage) is provided in the drain pot. This means that the inlet-side siphon is defined by the one part, that is by the one-piece part containing the outer walls.

In a preferred embodiment, the air duct, in particular in integrated design, to the nominal water level of the respective siphon is open at the bottom. It is, so to speak, a "covered breakthrough" open at the bottom between the two nominal air areas of the affected siphon stage, cf. the embodiment. This design has the advantage that any dirt can fall down and the air duct is also flushed regularly.

This embodiment is even more favorable if this structure widens downwards to the nominal water level. This is preferably true not only for the air duct itself, but for the structure defining it below the nominal water level.

Basically, an arrangement of the air duct between the internal air area and the drain side is preferred in the invention, ie at the second or last siphon stage. Often and within the scope of this invention, preferably there is a smaller sealing water level provided and thus the formation of the air duct in the just described downwardly open variant with a smaller engagement. Also, regardless of this special design of the air duct, this forms a short circuit of the sealing water height in a certain way, so it is preferable to arrange this at the siphon stage with the smaller sealing water level (defined without air duct). That is also the case with the exemplary embodiment. In many practical cases, there is the addition of a longer vertical pipe section or at least one pipe section with a vertical component above the inlet side. If then the first (inlet side) siphon provides a sufficient volume of water on its other side, this means that beyond the per se intended sealing water level, the water level can rise relatively high at a drain-side overpressure in the inlet region, z. B. up to an inlet grill a shower drainage channel. Thus, relatively large overpressure events can be absorbed in the drainage system without air passage.

According to a further embodiment of the invention, the water volume of the input-side siphon outside the input-side drain pot is relatively large. This is initially in the context just described advantage of. Specifically, the volume of water outside the drain pot is preferably at least 1.4 times the volume in the drain pot, ie inlet side. In the following order, the following lower limits are increasingly preferred: 1.5 times, 1.6 times, 1.7 times or even 1.8 times. In the embodiment, the volume is about twice as large. However, values over 3 times or 4 times affect the size and are less preferred.

Such a storage volume can be achieved by appropriate broadening of the cross section. If then z. B. decreases due to an external pressure difference of the water level in the inlet side drain pot and accordingly (apart from previous evaporation losses) of the associated water level increases in the increased storage volume and overflows to the subsequent siphon, relatively less is lost sealing water of the first siphon. This is because, due to the large cross-section, the water level increases by correspondingly smaller distances or, in an alternative image, the volume displaced in the inlet side drain pot and volume lost by overflowing accounts for a smaller proportion in relation to the large storage volume. In particular, a favorable stock still remains if, due to a strong negative pressure in the sewer network through the entire odor trap air is sucked in, so the water level in the inlet side drain pot drops there to the entire height of the sealing water.

Incidentally, in this situation, the existence of further siphon stages ensures that the water overflowing from the first siphon stage is not lost. Furthermore, the air-dynamic effects (wave shock) are weaker, because by dividing the pressure difference to a plurality of stages per stage less violent air flow occurs. The total odor trap, so to speak, has a greater total flow resistance for the air.

Furthermore, the connection between the inlet-side drain pot and the other part of this siphon outside the drain pot is preferably relatively narrow and is at most 10 cm ² and in the following order increasingly preferred even only at most 9 cm ² , 8 cm ² or even only 7 cm ² Alternatively, values of at most 70%, preferably at most 65% or even only at most 60% of the largest cross-sectional area in the drain pot itself are preferred. For example, the flow area of this narrowest point in the embodiment is about 50% of the cross-sectional area in the drain pot, namely 700 mm ² compared to about 1,400 mm ² (with an inside diameter of 42 mm.) Values below about 20% or 30% increase the flow resistance unfavorably

By narrowing relatively high flow velocities are achieved, so that the deposition of dirt can be counteracted. In addition, the height can be reduced in this form. At this juncture additional volume of water also does not contribute significantly to the function of the trap. A smooth edgeless design, in particular of the lower wall section (inside) in the entire area of the first siphon stage also contributes to the avoidance of contamination.

A preferred field of application of a water drain according to the invention relates to floor drains in the sanitary area, in particular shower floor drains. Particular advantages can be achieved here by a good reliability at the same time low overall height, which is preferably at most 7.5 cm, in the following order increasingly preferred even only at most 7.0 cm or 6.5 cm. In the exemplary embodiment, this value is 6.2 cm. At much smaller values, more than two siphon stages will be needed, which is possible but not preferred within the scope of this invention.

Fig. 1

eine Längsschnittansicht eines erfindungsgemäßen Wasserablaufs mit nominellem Wasserstand darin;

Fig. 2

die in Fig. 1 mit X bezeichnete Stelle in doppeltem Maßstab;

Fig. 3

eine Fig. 1 entsprechende Seitenansicht und

Fig. 4

eine Schnittansicht in Hauptströmungsrichtung gemäß der in Fig. 3 mit A-A bezeichneten Schnittebene.

In the following the invention will be explained in more detail with reference to an exemplary embodiment, which is shown in more detail and to scale in the figures. In detail shows:

Fig. 1

a longitudinal sectional view of a water drain according to the invention with nominal water level therein;

Fig. 2

in the Fig. 1 double-digit place indicated by X;

Fig. 3

a Fig. 1 corresponding side view and

Fig. 4

a sectional view in the main flow direction according to the in Fig. 3 with AA designated cutting plane.

In Fig. 1 an inventive water drain is shown as an embodiment in longitudinal section. In this case, the main flow direction of the water runs from left to right and corresponds to the representation of the nominal installation position, wherein a provided with the reference numeral 1 nominal water level is located. On the left is a pipe socket 2 can be seen, for example, can be connected to the underside of a conventional shower drainage channel and waste water from the bottom drain formed by the gutter down flow when the shower is used. The pipe socket 2 is inserted into a flared end of a drain-pot-like cylindrical part 3 of the water outlet and sealed and held by a seal 4 and a clamp-like locking ring 5. The structures described so far are rotationally symmetric and known per se.

The cylindrical part 3 of the drain pot continues downwards in a no longer rotationally symmetrical section 6 of the drain pot, which has an inclined surface 6 to the left and a knee-like transition 7 to the right, wherein the inclined surface 6 approximately from the central axis of the cylindrical part 3 of the drain pot continues horizontally and the non-rotationally symmetrical parts of the drain pot with respect to the diameter of the cylindrical part 3 in the direction perpendicular to the plane slightly taper, as in Fig. 3 indicated.

The knee 7 forms a bottleneck and connects the drain pot 3, 6 with an outer part 8 of a first siphon stage of the water drain. This outer part has a to the right initially only slightly and without edges rising bottom, in contrast to the upper wall right of the knee 7 increases significantly and thus in the outer part 8, a relatively large volume of water, in this case 210 cm ³ , can be maintained, which corresponds to about twice the volume of water in the drain pot.

At the right end of this outer storage part 8, the bottom wall also rises relatively strongly up to a first maximum point 9 (in height), which is approximately at the level of the upper end of the flared upper end of the cylindrical part 3 of the drain pot. This first maximum point 9, together with a second maximum point 11 further to the right at the same level, determines the nominal water level 1 and thus also the sealing water level of the first siphon stage opposite the knee 7 (ie the lowest point of the upper wall of the water outlet there). Between the first maximum point 9 and the second maximum point 11 there is a second knee 10, which, however, is drawn much less deeply down than the knee 7 of the first siphon stage.

Also, the upper wall is drawn less deep down in the region of the present here second siphon as in the area of the first knee 7. Accordingly, the second siphon between the two maximum points 9 and 11 has a much smaller sealing water level. The upper wall maintains apart between the two maximum points 9 and 11 by their distance from the bottom wall of the air duct still to be discussed below a substantially constant flow cross section within the second siphon, which is also significantly smaller than the upstream flow cross sections, only the first knee 7 has an approximately comparable flow cross-section. It should be added that the water drain between the non-cylindrical part 6 of the drain pot and the second maximum point 11 has substantially the same width in the direction perpendicular to the plane of the drawing. From the second maximum point 11 there is then a continuous transition of the rather flat and wide channel shape still up to this maximum point 11 in a cylindrical pipe section 12 for connection to a sewer in the usual manner. The flat wide channel shape shows Fig. 4 with a section AA, the in Fig. 3 is indicated and shows the second siphon at the lowest point and seen in the flow direction.

Here one can see in particular the typical for the invention air duct, namely in the form of an approximately triangular and downwardly open extension 13 of the actually substantially rectangular (with rounded corners) water channel of the process below. More specifically, the air duct is a topmost small area 14 which increases in size Fig. 2 Incidentally, the extension 13 is filled with water at a nominal water level. However, the nominal water level 1 remains slight, in this case only about 0.2 mm, below the inner upper edge of the extension 13, so that the second siphon stage is shorted to a quantitatively small extent at nominal water level and without external pressure difference. It is easy to see that even a small pressure difference between inlet side and outlet side (ie between the atmosphere above the water level 1 in the drain pan 3, 6 and the atmosphere in the cylindrical portion 12 right) the air channel 14 cancels, the small cross-sectional area of about 0.5 mm ² generates such a large air flow resistance that reasonably quickly occurring under- or overpressure conditions in the discharge system actually have a pressure difference and thus a change in the water level result.

The function of the air channel 14 is to restore the internal air cushion between the two siphon stages, ie above the water level 1 of the storage part 8, above the first maximum point 9 and above the water level 1 on the inside of the second siphon stage, if there is a full filling in a drain operation has, because this air cushion has been rinsed out over time. This restoration of the internal air cushion significantly reduces in the experience of the inventors, the risk that the entire water flow unintentionally completely or largely idle and its function is lost or impaired in its function.

Furthermore, it can be seen that an air duct could in principle also be provided in non-integrated form and / or as a pipe section separated from the water channel and / or in the first siphon stage, in the latter case, because of the necessity of the seal 4 and the securing ring 5, higher would have to be laid, which would worsen the overall height. Although the water drain strictly speaking without the pipe socket 2, but in many cases more parts, for example, the floor drain are provided on the locking ring 5, to take into account.

In addition, it will be appreciated that the double siphon shown here could also have more than two siphon stages with a similar logic of the invention, in which case the air channel would short-circuit an outer siphon stage, possibly both. In many cases, however, the distribution of a desired total sealing water level is sufficient, as here, two siphon stages.

In addition, it can be seen that the entire water drain can be designed as a one-piece Kunststoffblasteil, in the present case including the extension 13 and thus the air duct 14th

Finally, it can be seen that the lower main section, which is filled with water in the nominal water level, flows through the extension 13 at each discharge process and hardly contaminates due to lack of soil and the water drainage floor between the cylindrical part 3 of the drain pot and the first maximum point 9 is very smooth and flat and despite the considerable storage volume in the storage part 8 does not provide any contamination-critical points, in particular is flushed well.

Claims (14)

Water drainage with
an inlet-side drain pot (3, 6),
an attached drain line (12)
and a multiple siphon trap (3, 6-11) having an internal air area,
characterized in that an air channel (13, 14) is provided between the internal air area and a peripheral air area in the water drain at an inlet side and / or a discharge side of the water outlet. A water drain according to claim 1, wherein the multiple siphon trap (3, 6-11) is a double siphon trap. Water drain according to claim 1 or 2, in which the nominal water levels (1) of the individual siphon structures (3-8, 9-11) of the odor trap (3, 6-11) are adjacent to one another, ie have an overlap in horizontal projection. Water drain according to one of the preceding claims, wherein the air duct (13, 14) is provided between the edge-side air region on the discharge side and the inner air region. Water drain according to one of the preceding claims, in which the multiple siphon trap (3, 6-11) is integral with respect to the outer walls of the water-carrying part, preferably a plastic blower. Water drain according to claim 5, wherein the inlet-side siphon (3-8) of the multiple siphon trap (3, 6-11) is defined by the one part. Water drain according to claim 5 or 6, wherein the air duct is integrated in the one part. A water drain as claimed in any one of the preceding claims, wherein the air duct (13, 14) is open downwardly to the nominal water level (1) of the multiple siphon trap (3, 6-11). Water drain according to claim 8, in which the air duct (13, 14) widens downwards to the nominal water level (1) of the multiple siphon trap (3, 6-11). Water drainage according to one of the preceding claims, in which the nominal water volume of the inlet-side siphon (6-8) outside (8) of the inlet-side drain pot (3, 6) is at least 1.4 times the nominal water volume within the inlet-side drain pot (3, 6 ) is. Water drain according to one of the preceding claims, wherein the cross-sectional area of the narrowest point (7) between the drain pot (3, 6) and lying outside the drain pot portion of the input-side siphon at most 70% of the largest cross-sectional area in the drain pot (3, 6) itself , measured perpendicular to the main flow direction. Sanitary floor drain according to one of the preceding claims. Shower floor drain according to claim 12. Water drain according to one of the preceding claims with a total height of at most 7.5 cm.

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