DK2157248T3

DK2157248T3 - Drain with siphon

Info

Publication number: DK2157248T3
Application number: DK09165624.9T
Authority: DK
Inventors: Johannes Arndt
Original assignee: Viega Gmbh & Co Kg
Priority date: 2008-08-22
Filing date: 2009-07-16
Publication date: 2015-01-26
Also published as: EP2157249A3; DK2157249T3; ES2527777T3; PT2157249E; DE202008011197U1; EP2157248A2; ES2496667T3; EP2157248B1; PL2157249T3; EP2157248A3; EP2157249B1; PL2157248T3; EP2157249A2; PT2157248E

Description

DESCRIPTION

The invention relates to a drainage fitting with an odor trap, with a housing comprising a drain and forming a housing chamber, and with an immersion pipe which extends into the housing chamber and which is spaced apart from the housing base and, together with the housing, delimits a reservoir volume in the form of an annular chamber, wherein a nozzle extends from the reservoir volume for connecting to a pipe system, wherein a nozzle connection section connecting the reservoir volume to the interior of the nozzle is provided in the housing, and wherein the odor trap is effected by means of seal water provided in the immersion pipe and in the reservoir volume, wherein a constructional element is provided which widens the flow cross-section of a flow channel that leads from the interior of the immersion pipe to the nozzle connection section and is thus constituted in such a way that it effects a change in the flow behaviour in the flow channel. Such a drainage fitting is known from US 3,651,826 A. A comparable drainage fitting is also disclosed in DE 20 2005 017 965 U1 and DE 10 2006 053 751 A1.

Drainage fittings with an odor trap are already known in the prior art. Patent application EP 0 634 530 Al, for example, discloses an odor trap which comprises a floating ball in the seal water. If the seal water level drops below a level securing the odor trap, for example because a large part of the seal water has been drawn off due to an underpressure in the pipe system connected to the drainage fitting, the ball is set down in a ball seat disposed on the immersion pipe and thus mechanically prevents the penetration of gases from the drainage system into the drainage chamber. However, the drainage fitting known from EP 0 634 530 A1 takes up a large amount of installation space, which has to be taken into account when installing showers or baths. With the floating ball, moreover, a further component is required in the drainage fitting, as a result of which the susceptibility to malfunction is fundamentally increased. Furthermore, there is the risk of the ball sticking to the ball seat on account of deposits or impurities, thus hindering the water drainage and not being able to be released again without mechanical intervention from the exterior. A problem with the prior art from DE 10 2006 053 751 Al, moreover, is that the flow conditions are not optimum in the water draining away and in the reservoir volume, as a result of which the odor trap does not always function in the optimum manner.

Proceeding from this, the problem of the present invention is to provide a drainage fitting with an odor trap, which optimises the flow conditions of water draining away.

The problem is solved by a drainage fitting with the features of claim 1.

The constructional element is formed in the nozzle connection section (16a) by a partial recess (20) which therefore extends only over a certain section of the circumference of the housing (4) and which extends radially outwards with respect to the annular chamber (14) .

Through the provision of such a constructional element, which modifies the flow cross-section of a flow channel leading from the interior of the immersion pipe to the nozzle connection section in the manner described above, additional means such as a floating ball for the mechanical sealing of the drainage fitting with respect to gases from the connected pipe system become unnecessary. Instead, the odor trap is ensured by the seal water, even when the seal water level in the drainage fitting is lowered due to the effect of an underpressure in the connected pipe system.

During a drop in the seal water level in the immersion pipe caused by an underpressure, part of the seal water remains in the reservoir volume and can ensure the odor trap. If the seal water level roughly reaches the height of the front face of the immersion pipe facing towards the housing base as a result of pressure conditions, there is the risk, due to the air intake through the immersion pipe and the reservoir volume into the nozzle or the pipe system, of the seal water being drawn off to an extent such that the odor trap cannot be reliably restored after the end of the pressure disruption.

With the embodiment of the drainage fitting according to the present invention, it is possible to provide in the reservoir volume the quantity of seal water required for the odor trap, even when air is sucked into the pipe system through the drain, the immersion pipe and the reservoir volume.

The flow cross-section of the flow channel leading from the interior of the immersion pipe to the nozzle connection section - i.e. essentially in the reservoir volume - is thus modified in such a way that an air channel is formed in the seal water present in the flow channel, through which air channel air sucked in via the drain can pass into the pipe system. This kind of "short-circuit" for the most part prevents excessive seal water from being lost in the pipe system in the event of pressure disruptions. After the end of the pressure disruption, the level of seal water required for the reliable functioning of the odor trap can be restored by means of the backflow of the seal water provided in the reservoir volume into the immersion pipe. Since at least part of the seal water is therefore not lost during a disruption caused by an underpressure, and the nominally provided seal water level can be reduced, drainage fittings with a flatter and therefore space-saving design can be constituted. In particular, the installation of such a drainage fitting is thus simplified.

As a result of the provision of the seal water in the reservoir volume, moreover, the restoration of the odor trap by means of seal water is also ensured in the event of repeated pressure disruptions. The correspondingly constituted drainage fitting is thus particularly well suited for connection to pipe systems in which pressure fluctuations frequently occur.

Finally, provision is made with the drainage fitting according to the invention such that the immersion pipe widens on the inside towards the housing base. In this way, the flow conditions of water draining away in the immersion pipe and in the surrounding reservoir volume, and therefore in the flow channel, can be optimised. If, according to an embodiment, the immersion pipe has a concave curvature, the volume of the reservoir volume can be increased relative to the volume of the immersion pipe, so that the reservoir volume offers more space for providing seal water.

The partial recess brings about, in particular, a cross-sectional widening of the flow channel and therefore a pressure reduction in the water which flows through the flow channel in the presence of an underpressure prevailing in the pipe system. The effect of the pressure reduction is in particular that - as soon as air is sucked in - a stable air channel is formed from the interface between air and water, for example in the immersion pipe, up to the nozzle connection section. The flow of air which, in the case of a drop in the seal water level to around the height of the lower front face of the immersion pipe, is sucked from the drainage chamber through the immersion pipe and the reservoir volume into the pipe system, can thus be directed into an air channel by means of a straightforward structural embodiment. In the event of a pressure disruption, the reservoir volume can thus advantageously provide a quantity of seal water required for the restoration of the odor trap. The partial recess is preferably constituted in the nozzle connection section in such a way that it is positioned directly upstream of the nozzle in the flow direction. The formation of an air channel in the case of a pressure disruption can thus be promoted in a targeted manner. A nozzle barrier retaining the seal water in the reservoir volume is preferably disposed in the nozzle connection section, and the vertical spacing between the housing base and the nozzle barrier preferably amounts to between 30 mm and 50 mm. A particularly flat and therefore easily installable design of the drainage fitting is thus ensured.

The partial recess can extend roughly up to the height of the nozzle barrier. In this way, the formation of the air channel in the case of an underpressure can be influenced up to the height of the maximum possible seal water level in the reservoir volume.

In a further advantageous embodiment of the drainage fitting, the reservoir volume comprises a section widened radially outwards roughly at the height of the nozzle barrier and/or of the recess. In the case of an underpressure in the pipe system, the widened section can be used to accommodate seal water in particular drawn off from the immersion pipe, i.e. it can thus act as a kind of additional seal water accommodation volume. An increased quantity of seal water can thus be provided, which contributes, after the pressure disruption has died down, to restoring a seal water level in the reservoir volume and in the immersion pipe that ensures the reliable functioning of the odor trap.

The nozzle connection section preferably connects the widened section to the interior of the nozzle. The seal water provided in the aforementioned additional seal water accommodation volume can thus flow back under the effect of gravity into the lower part of the reservoir volume or into the immersion pipe.

The constructional element is preferably constituted such that complete drawing-off of the seal water from the reservoir volume due to pressure fluctuations in a pipe system connected to the drainage fitting is prevented.

The configuration of the constructional element, for example the depth and/or the shape of a partial recess on the nozzle connection section, preferably takes place in coordination with individual specific parameters or an arbitrary combination of these specific parameters of the drainage fitting, for example the volumes of the immersion pipe and the reservoir volume, the spacings between the drain and the housing base or the housing base and the nozzle barrier, and if appropriate taking account of the pressure fluctuations usually occurring in pipe systems. A pin can extend from the middle of the housing base into the immersion pipe, preferably only into the widened section of the immersion pipe, i.e. not beyond. The formation of troughs at the housing base, which can adversely affect the flow conditions, can thus be avoided. Moreover, the risk of deposits in the damming region of water draining away in the middle of the housing base is prevented.

In a further advantageous embodiment of the drainage fitting, the flow cross-section is at its smallest between the front face of the immersion pipe that faces the housing base and the housing base and/or between the front face of the immersion pipe that faces the housing base and the housing wall that radially outwardly delimits the reservoir volume and enlarges immediately thereafter. In other words, the flow cross-section inside the previously defined flow channel, which leads from the interior of the immersion pipe to the start of the nozzle connection section, is smaller than at any other point of the flow channel. Furthermore, it is preferable for the flow cross-section to be at its largest in the region of the partial recess. The largest flow cross-section can be widened with respect to the smallest flow cross-section by more than 10 %, in particular by more than 20 %. Particularly favourable flow conditions of the water in the flow channel are thus brought about. Furthermore, such an embodiment has an advantageous effect on the formation of an air channel for the "short-circuiting" of the drainage chamber with the pipe system in the case of a pressure difference which prevails not just over a short time.

The reservoir volume can be constituted for example as an annular chamber, in particular a torus. Other geometrical shapes of the reservoir volume performing the same function are however also possible.

There are a large number of possibilities for configuring and developing the drainage fitting with the odor trap according to the invention. In this regard, reference is made on the one hand to the dependent claims subordinate to the independent claim and on the other hand to the description of an example of embodiment in connection with the drawing. In the drawing:

Figure 1 shows an example of embodiment of the drainage fitting with an odor trap according to the present invention in an isometric cross-sectional view and

Figures 2a-d show a description of the mode of functioning of the odor trap according to the present invention with the aid of diagrammatic cross-sectional views.

Fig. 1 shows an example of embodiment of drainage fitting 2 with an odor trap according to the present invention. Incorporated in a housing 4 is a drain 6 which in this example is circular. An edge-supported sieve or an edge-supported filter (not represented) can be positioned in drain 6 in order to prevent the penetration of solids into housing chamber 4a.

An immersion pipe 8 is fixed to housing 4 in the region of drain 6, said immersion pipe extending into housing chamber 4a up to shortly before housing base 10 and thus being spaced apart from the latter. In this example, immersion pipe 8 has a concave curvature, as a result of which the flow behaviour of a fluid, for example water, being drained through drainage fitting 2 can be favourably influenced and the volume of immersion pipe 8 can be reduced.

Disposed centrally on housing base 10 is an approximately cone-shaped pin 12, which extends into immersion pipe 8 above the plane of the lower front face of immersion pipe 8 in the direction of drain 6. Pin 12 advantageously prevents the formation of troughs at housing base 10, which can unfavourably affect the flow behaviour and in which deposits can settle.

In this example, a reservoir volume is constituted as an annular chamber 14 between immersion pipe 8 and housing 4. The annular chamber 14 comprises at one point a nozzle connection section 16a and a nozzle 16 for connecting drainage fitting 2 to a pipe system (not shown), for example a process water or grey water pipe system. In order that water being drained can drain away from annular chamber 14 into nozzle 16, it has to overcome a barrier 18 provided on housing 4, said barrier being formed by housing 4 and extending in this example up to just beneath the height of drain 6. In this example, annular chamber 14 comprises a section 21 which is widened radially outwards and disposed just beneath nozzle barrier 18, in order to create an additional volume for receiving seal water (not shown) in annular chamber 14.

An, in this example, partial recess 20 which extends radially outwards and which acts as a constructional element is located somewhat beneath the barrier height in nozzle connection section 16a. As a result of partial recess 20, the flow cross-section of the flow channel leading from the interior of immersion pipe 8 to nozzle connection section 16a is modified. By means of partial recess 20, it is possible, in the case of an underpressure in the connected pipe system, to channel the flow of air sucked in at drain 6 in such a way that a large part of the seal water (not represented) in annular chamber 14 is not drawn off. On the contrary, part of the seal water can be held available in annular chamber 14 during the pressure disruption. After the pressure disruption has ceased, the seal water thus held available can flow back into immersion pipe 8 and restore the seal water level required for the odor trap.

Fig. 2a shows drainage fitting 2 from fig. 1 in a diagrammatic cross-sectional view. In this example, immersion pipe 8 and annular chamber 14 are filled with seal water (shaded area), as far as possible (see right-hand section of housing 4), up to maximum height 22 of nozzle barrier 18 in nozzle connection section 16a. If water continued flowing through drain 6, it would be carried away through immersion pipe 8 and annular chamber 14 over nozzle barrier 18 and via nozzle 16 into a connected pipe system. In the normal state represented in fig. 2a, identical pressures pi and P2 prevail both in the drainage chamber above drain 6 and in the pipe system with which drainage fitting 2 is connected via nozzle 16. The seal water thus reliably prevents the penetration of gases from the pipe system into the drainage chamber.

If an underpressure now arises - as indicated in fig. 2b - in the pipe system, i.e. if pi is less than p2, part of the seal water effecting the odor trap is drawn off over nozzle barrier 18 (continuous arrow 24). The seal water is then conveyed out of immersion pipe 8 into annular chamber 14 (continuous arrow 26), as a result of which the seal water level in immersion pipe 8 drops. As long as the seal water level in immersion pipe 8 has not yet reached level 28 of the lower front face of immersion pipe 8, the odor trap is not impaired. If the pressure difference (p2 > Pi) continues, however, there is the risk that the seal water level will fall below minimum height 28 in immersion pipe 8, the seal water will be drawn off almost completely via nozzle 16, and therefore the odor trap cannot be restored by means of the seal water after the cessation of the pressure difference without feeding water from the exterior.

Fig. 2c shows how complete drawing-off of the seal water out of annular chamber 14 over nozzle barrier 18 into the pipe system is prevented according to the present invention. As a result of partial recess 20 in nozzle connection section 16a to annular chamber 14, the flow behaviour of the air sucked in from drain 6 (dashed arrow 30) is channelled in such a way that only a small part of the seal water provided in annular chamber 14 is lost.

The sucked-in air is fed to the pipe system via nozzle 16, an air channel 32 thereby being formed in the seal water. The flow conditions shown here are to be understood as being diagrammatic and by way of example, and can have a divergent form depending on the configuration of the constructional element, which modifies the flow cross-section of the flow channel leading from the interior of immersion pipe 8 to nozzle connection section 16a. As long as pressure difference P2 > pi persists, the odor trap of drainage fitting 2 is ensured despite air channel 32, since the flow direction of the air prevents gases from the pipe system passing through drainage fitting 2 into the drainage chamber.

Fig. 2d finally shows the state of drainage fitting 2 after the equalisation of pressures P2 and pi. The seal water provided in annular chamber 14 - especially advantageously in section 21 widened radially outwards as an additional seal water accommodation volume - can flow back into immersion pipe 8 (continuous arrow of 34), until the seal water levels in immersion pipe 8 and in annular chamber 14 lie roughly at the same height 36. The volumes of immersion pipe 8 - through the formation of a concave curvature - and of annular chamber 14 - taking account of partial recess 20 and of section 21 widened radially outwards - are adapted to one another in this example in such a way that the seal water level in annular chamber 14 drops from level 22 of nozzle barrier 18 to the shown next lower level 36. Next lower level 36 is preferably spaced apart from housing base 10 in the vertical direction 38 by approx. 30 mm, in particular 32 mm. A drainage fitting 2 with a reliable odor trap can thus also be implemented with a small height.

Claims

A water trap drain fitting (2) comprising a housing (4) having a drain (6) forming a housing chamber (4a) and having a plunger tube (8) extending into the housing chamber (4a) and which is spaced from the housing bottom (10) and together with the housing (4) delimits a reservoir volume in the form of an annular chamber (14), therefrom leaving the reservoir volume (14) a stud (16) for connection to a conduit system, in which the housing (4) is provided with a stud connection portion (16a) which connects the reservoir volume (14) to the interior of the plug (16) and wherein the water trap is provided by barrier water retained in the diving tube (8) and in the reservoir volume (14). , wherein a structural element is provided which extends the flow cross-section of a flow channel leading from the interior of the diving tube (8) to the stud connection section (16a), and is thus designed to provide a change in the flow conditions in the flow channel, and characterized by that the structural element is formed by a partial, i.e. extending only over a certain portion of the circumference of the housing (4), relative to the annular chamber (14) radially outwardly recessed (20) in the stud connection section (16a) and that the diving tube (8 ) extends internally towards the base (10).

Discharge luminaire according to claim 1, characterized in that a stud barrier (18) is provided in the stud connection section (16a) which retains the barrier water in the reservoir volume (14) and that the vertical distance between the housing floor (10) and the stud barrier (18) in particular is between 30 mm and 50 mm.

Drain fitting according to claim 2, characterized in that the reservoir volume (14) approximately at the height of the bouncing barrier (18) and / or recess (20) comprises a radially outwardly extending portion (21) relative to the annulus (14).

Drain fitting according to claim 3, characterized in that the stud connection section (16a) connects the extended section (21) to the interior of the plug (16).

Drain fitting according to any one of claims 1 to 4, characterized in that the diving tube (8) has a concave curvature.

Drain fitting according to any one of claims 1 to 5, characterized in that a mandrel (12) extends from the center of the housing bottom (12) into the diving tube (8).

Drain fitting according to any one of claims 1 to 6, characterized in that the flow cross-section between the end side of the diving tube (8) and the housing bottom (10) and / or between the end side of the diving tube (10) facing the housing (10) 8) and the housing wall which radially externally limits the reservoir volume (14) relative to the annulus (14) is smallest and immediately thereafter increased.

Drain fitting according to any one of claims 1 to 7, characterized in that the flow cross-section in the area of the partial recess (20) is greatest.

9th

Drain fitting according to any one of claims 1 to 8, characterized in that the largest flow cross-section is extended by more than 10%, especially more than 20%, relative to the smallest flow cross-section.