Drain fitting, especially for shower trays, with adjustable immersion pipe

Description

[0001] The invention relates to a drain fitting, in particular for shower or bathtubs, with a drain housing which has an interior space accessible from an upper inlet opening, with a drain nozzle protruding from the drain housing, with a partition wall defining an overflow edge between the interior space and the drain nozzle, with an immersion pipe which is inserted into the drain housing and can be removed from the same and forms part of an odor trap, and with a fastening flange for securing the drain housing to a drain opening of a shower or bathtub.

[0002] Such a drain fitting is known from EP 2 363 543 B1. The drain fitting has a housing wall (partition wall) located between the interior and the drain nozzle, defining an overflow edge. An opening is formed in the housing wall for cleaning purposes. This opening is closed by a removable plug having a handle element accessible from the interior. The plug inserted into the cleaning opening is held and fixed in the closed position by the immersion tube inserted into the drain housing. Therefore, even when using a plunger to clean the drain fitting and the connected drain line, it remains securely positioned in the cleaning opening and reliably seals it to prevent any loss of sealing water in the odor trap.On the other hand, the plug can also be easily removed from the opening after removing the immersion tube in order to clean the drain nozzle and the connected drain line using a flexible cleaning spiral or a pressurized water flushing hose if necessary.

[0003] To secure the drain housing according to EP 2 363 543 B1 to the drain opening of a shower tray or bathtub, a fastening flange is provided which rests against the upper edge of the drain opening with a slightly conical inclined surface, while a sealing ring surrounding the inlet opening of the drain housing is pressed against the lower edge of the drain opening of the shower tray or bathtub by tightening fastening screws that are inserted into through-holes in the fastening flange and screwed into threaded holes in the drain housing. At the drain opening of the shower tray or bathtub, a cavity is created between the conical inclined surface of the fastening flange and the sealing ring, the size of which depends on the shape of the drain opening and the thickness of the floor of the shower tray or bathtub. Dirt can accumulate in this cavity.

[0004] The applicant's drain fitting, known from EP 2 363 543 B1, has proven very effective in practice. However, this drain fitting appears to still have room for improvement in terms of preventing dirt pockets in the area between the mounting flange and the sealing ring.

[0005] DE 20 2008 010 106 U1 discloses a drain fitting for shower trays, with an odor trap comprising a cup-shaped container and an immersion pipe extending into the container. The immersion pipe is removably held at the inlet opening of the drain fitting housing. For this purpose, the upper housing section has a shoulder formed at the inlet opening, to which the immersion pipe is held by a radially projecting flange formed at the upper end of the immersion pipe. When the immersion pipe is inserted, the upper side of the flange lies slightly below the level of the adjacent surface area of ​​the upper housing section. The flange is provided with a lateral annular groove into which a sealing ring can be inserted. Furthermore, two radially projecting ears are formed on the flange, which are assigned correspondingly designed recesses in the upper housing section.The recesses and the ears that fit into them are intended to ensure a specific alignment of the immersion tube in relation to the upper part of the housing or the cup-shaped container.

[0006] DE 196 51 405 A1 discloses a siphon for showers and bathtubs. The siphon has a siphon body with an inlet pipe attached to its upper wall. A dip tube running coaxially with the inlet pipe is arranged inside the siphon body. Furthermore, the siphon has a lateral outlet for water drainage. A removable container is provided around the dip tube in the siphon body, which, together with the dip tube, defines a siphon chamber. For positioning, the dip tube has a plurality of annular grooves in which one or more annular seals are inserted, which interact with the inner surface of the inlet pipe through friction.

[0007] EP 1 775 395 A1 describes a drain fitting for showers or bathtubs, comprising a housing with an inlet opening and a drain connection for connection to a waste pipe, as well as a wall forming a housing space with an overflow edge. A dip tube, which is removably inserted into the housing space, forms an odor trap with it. The dip tube has an annular groove at its upper end, into which a seal is inserted. This seal rests tightly against the inner surface of an inlet pipe, which has a collar for securing it to the tub floor and is screwed into a housing cover from above.

[0008] DE 196 49 239 A1 shows a drain fitting for shower or shower trays with a vertically adjustable immersion pipe. The drain fitting can be adapted to different wall thicknesses of the shower or shower tray. In one of the embodiments shown, the immersion pipe has a collar at its upper end. On the collar, an annular groove for receiving an O-ring seal can be seen. This groove is defined by two annular, vertically spaced collar sections. The O-ring seal serves to seal against an outlet or inlet pipe, which in turn has a collar at its upper end with which it rests on the upper side of the tray floor. The collar of the outlet or inlet pipe has a shoulder on the inside into which the collar of the immersion pipe is positively inserted.

[0009] The present invention is therefore based on the object of improving a drain fitting of the type mentioned at the outset with regard to avoiding dirt nests below the fastening flange.

[0010] This object is achieved by a drain fitting having the features specified in claim 1. Advantageous embodiments of the drain fitting according to the invention are specified in the subclaims.

[0011] The drain fitting according to the invention is characterized in that the immersion pipe has a shortenable annular collar at its upper end, which has a plurality of annular collar sections alternating with one another in the vertical direction, which collar sections differ from one another in terms of a different material hardness and / or in terms of a different collar wall thickness, wherein the annular collar in the unshortened delivery state has at least four, preferably at least six such collar sections, and wherein, by means of the collar in the assembled state of the drain fitting, a hollow space can be covered which lies in the area of ​​the drain opening of the shower or bathtub between the drain housing arranged on the underside of the tub base and the fastening flange arranged on the top side of the tub base.

[0012] By means of the annular collar of the immersion pipe, a cavity which lies in the area of ​​the tub floor opening between the drain housing arranged on the underside of the tub floor and the fastening flange arranged on the top of the tub floor and in which dirt pockets can form can be covered, so that the occurrence of said dirt pockets is avoided.

[0013] Because the collar has a plurality of vertically alternating annular collar sections, which differ from one another in terms of material hardness and / or collar wall thickness, the height of the collar can be easily adapted to different floor thicknesses of shower trays or bathtubs in the area of ​​the floor drain opening or to different heights of the cavity to be covered. The annular collar of the immersion pipe has at least four, preferably at least six, and particularly preferably at least eight such collar sections in its uncut delivery state.

[0014] The fastening flange preferably has a circumferential, essentially cylindrical collar or sheet metal passage, to which a flange section is connected.

[0015] An advantageous embodiment of the process assembly according to the invention is characterized in that the annular collar sections are made vertically alternately from a soft component, preferably from an elastomer or from a polyolefin, and from a hard component, preferably from a thermoplastic, particularly preferably from polypropylene. The respective annular collar section made from a soft component enables a good or improved sealing function on the mounting flange. In particular, the soft collar sections allow a radial tolerance compensation between the collar and the mounting flange. The soft component is, for example, an elastic plastic, preferably a rubber-elastic plastic, from the group of crosslinked or thermoplastic plastics.

[0016] A further advantageous embodiment of the drain fitting according to the invention provides that the collar of the immersion pipe is dimensioned such that, when the immersion pipe is inserted, it forms a press fit or transition fit with the mounting flange. This optimizes the sealing function of the collar on the mounting flange. Preferably, the press fit or transition fit of the collar with the mounting flange is achieved by at least one of the annular collar sections made of a soft component.

[0017] Preferably, the annular collar sections made of a soft component protrude outwards compared to the annular collar sections made of a hard component.

[0018] In order to achieve a relatively large free cross-sectional area of ​​the immersion pipe and thus a high drainage capacity with compact dimensions of the drain housing, a further embodiment of the drain fitting according to the invention provides that the immersion pipe has vertically extending recesses or niches for the positive reception of screw domes formed in the drain housing. This allows optimal use of the space available in the drain housing for accommodating the immersion pipe and maximizes the free cross-sectional area of ​​the immersion pipe.

[0019] A further advantageous embodiment of the drain fitting according to the invention is characterized in that the partition defining an overflow edge is flexibly deformable, such that a section of the overflow edge can be deformed into a trough shape by mechanical pressure. This makes it possible to access the areas of the drain housing located behind the partition much easier for cleaning.

[0020] The term "trough-shaped deformable" refers specifically to the reversible creation of a trough or trough-shaped depression in the partition. However, the flexible deformability of the partition is not limited to this. Rather, the flexible deformability of the partition also encompasses a partial or complete reversal of the flexibly deformable partition along its overflow edge.

[0021] The flexibly deformable partition wall is reversibly deformable.

[0022] The partition wall is preferably connected to the drain body as an integral part of the same.

[0023] Furthermore, the partition wall is preferably annular, so that it circumferentially delimits the interior of the drain housing accessible from the upper inlet opening, wherein the drain housing together with the partition wall delimits an annular drain channel surrounding the interior.

[0024] Flexible deformability of the partition wall is achieved, for example, by material properties that enable plastic or elastic deformation of the partition wall at least along a partial section of the overflow edge.

[0025] According to a further advantageous embodiment of the drain fitting according to the invention, the partition has an arcuate wall section curved inwards towards the immersion pipe and facing the drain socket. This design of the partition, with a suitable design of the immersion pipe with an inlet surface section formed thereon that projects outwards over the arcuate wall section of the partition curved inwards towards the immersion pipe, enables improved cleaning access to the drain socket after removal of the immersion pipe. Sometimes the arcuate, inwardly curved wall section of the partition needs to be barely deformed to clean the drain socket and the connected drain line in order to be able to insert a flexible cleaning spiral or a pressurized water flushing hose from the upper inlet opening of the drain housing into the drain socket after removal of the immersion pipe.

[0026] A further advantageous embodiment of the drain fitting according to the invention provides that the arched wall section of the partition, which curves inwards towards the immersion pipe, is connected to the partition in a liquid-tight manner via a substantially U-shaped thin section. This embodiment enables simplified, contour-accurate tearing or cutting out of said wall section of the partition. The thin section can also be referred to as a tear-off groove. The drain fitting can thus, in a state not covered by the claimed invention, also be used without its own integrated odor trap in drainage systems that have a central floor drain with odor trap through which all water-draining sanitary fixtures, in particular shower trays, with the exception of toilets, are drained. In this respect, it is not necessary to provide a siphon in the shower drain fitting.In such drainage systems, such as those commonly used in Southern Europe, the drain fitting can also be operated without the immersion pipe and without the arched wall section of the partition wall that curves inward toward the immersion pipe, in a state not covered by the claimed invention. The drain fitting according to the invention can be easily and cost-effectively adapted to country-specific requirements. This avoids or standardizes the production of different drain fittings to meet country-specific requirements, thereby reducing costs, particularly in the production, storage, and logistics of such drain fittings.According to a further advantageous embodiment of the drain fitting according to the invention, the immersion pipe has a non-circular cross-sectional profile with a pipe wall section that is associated with the wall section of the partition wall that curves inward toward the immersion pipe, wherein the pipe wall section has an outer profile into which the wall section of the partition wall protrudes or engages in a form-fitting manner. This design enables a relatively large free cross-sectional area of ​​the immersion pipe and thus a high drainage capacity, given compact or predetermined dimensions of the drain housing and good accessibility to the drainage areas that lie behind the partition wall in the flow direction of the wastewater to be drained.

[0027] Regarding good accessibility of the drainage areas, which, seen in the flow direction of the wastewater to be discharged, are located behind the partition wall, and regarding a high drainage capacity, it is also advantageous if, according to a further refinement of the drainage assembly according to the invention, the immersion pipe has a radially outwardly protruding inlet surface section which, in the installed state of the immersion pipe, protrudes beyond the wall section of the partition wall which is arched inwards towards the immersion pipe.

[0028] An advantageous embodiment of the drain fitting according to the invention is characterized in that the partition wall is flexibly deformable such that a section of the overflow edge can be deformed laterally into a trough-shaped shape by mechanical pressure toward the interior of the drain body. This makes, for example, a drainage channel leading into the drain socket, which, as seen from the interior of the drain body, is located behind the partition wall and preferably surrounds it in a ring or at least in sections, more easily accessible for cleaning.

[0029] A further advantageous embodiment of the drain fitting according to the invention provides that the partition wall is flexibly deformable such that a section of the overflow edge can be deformed laterally in the direction of the drain connection piece into a trough shape by mechanical pressure. This embodiment enables easy cleaning of the drain connection piece and a connected drain line using a flexible cleaning spiral or a pressurized water flushing hose, in contrast to the drain fitting known from EP 2 363 543 B1, which does not have a cleaning opening formed in the partition wall and closable by a removable plug.

[0030] According to a further advantageous embodiment of the drain fitting according to the invention, the drain housing is composed of a lower housing part and an upper housing part, wherein the lower housing part, together with the partition wall, defines a receiving space for receiving sealing water, wherein the lower housing part has a shoulder extending outward relative to the receiving space, wherein the shoulder merges into a housing wall extending upwards in the direction of the upper housing part, and wherein the housing wall, the shoulder, and the flexibly deformable partition wall define a drainage channel that opens into the drain nozzle. This embodiment allows a high drainage capacity to be achieved with comparatively compact dimensions of the drain housing.In contrast to the drain fitting known from EP 2 363 543 B1, the drain fitting according to the invention does not require a double-walled design of the partition wall defining an overflow edge; rather, the partition wall in the drain fitting according to the invention can be designed as a single-walled partition wall, whereby material for the partition wall can be saved and the dimensions of the drain housing can be reduced.

[0031] A further advantageous embodiment of the drain fitting according to the invention is characterized in that the flexibly deformable partition is made of a soft component, preferably an elastomer or a polyolefin. This allows good deformability of the partition in the event that cleaning of a drainage area located behind the partition is required. The flexible, deformable partition can be manufactured reliably and cost-effectively as an integral component of the drain housing by two- or multi-component injection molding, with the partition and the part of the drain housing directly connected to the partition being made of different plastics. The soft component from which the partition is made is, for example, also an elastic plastic, preferably a rubber-elastic plastic, from the group of cross-linked or thermoplastic plastics.

[0032] The lower housing part and / or the upper housing part are made, for example, from a hard component, preferably from a thermoplastic, particularly preferably from polypropylene. The housing part in question can thus be manufactured cost-effectively in a complex shape and with high dimensional stability. The invention is explained in more detail below with reference to a drawing illustrating several exemplary embodiments. In the drawings: Fig. 1 is a plan view of a section of a floor with an integrated shower tray equipped with a drain fitting according to the invention, and with a central odor trap arranged next to the shower tray and shown exposed; Fig. 2 is a vertical sectional view of the shower tray with the drain fitting and the central odor trap along the section line II-II in Fig. 1 ; Fig. 3 an enlarged view of detail X from Fig. 2 with the drain fitting; Fig. 4 an enlarged view of detail X from Fig. 2 with the drain fitting in a non-inventive state without odor trap function; Fig. 5 a housing lower part of the drain fitting in a perspective view; Fig. 6 an enlarged view of detail D from Fig. 5 ; Fig. 7 the drain housing of the drain fitting with a dip pipe and a partition in a perspective exploded view; Fig. 8 the drain housing in the mounted state on a floor drain opening of a partially shown shower tray, with inserted dip pipe; Fig. 9 the dip pipe from Fig. 8 , in a perspective view; Fig. 10 the drain housing in the mounted state on a floor drain opening of a partially shown shower tray, with inserted immersion pipe cut to length at the upper end; Fig. 11 the immersion pipe from Fig. 10 , in a perspective view; Fig. 12 a vertical sectional view of the drain housing and the immersion pipe removed therefrom; Fig. 13 a vertical sectional view of the drain housing, wherein a section of a partition defining an overflow edge in the drain housing is deformed in a trough-shaped manner; and Fig. 14 the housing lower part of the drain housing, wherein a section of the partition defining an overflow edge in the drain housing is deformed in a trough-shaped manner, in a perspective view;

[0033] The drain fitting shown in the drawing is particularly intended for draining a bathtub or shower tray 1. It comprises a drain housing 2 consisting of a lower housing part 2.1 and an upper housing part 2.2. The two parts 2.1, 2.2 are joined together in a materially bonded manner, for example, by welding. The upper housing part 2.2 has a receptacle 3 for a sealing ring 4, which, when the drain fitting is installed, surrounds the drain opening in the tub floor and forms a seal against the underside of the shower tray 1.

[0034] To secure the drain housing 2 to the lower edge of the drain opening of the shower tray 1, a mounting flange 5 is provided, which rests with a circumferential beveled surface against the upper edge of the drain opening of the shower tray, while the sealing ring 4 is pressed against the lower edge of the drain opening by tightening mounting screws 6, which are inserted into through-holes of the mounting flange 5 and screwed into threaded holes provided in the housing upper section 2.2. The threaded holes are formed, for example, by threaded sleeves cast into the plastic housing upper section 2.2. The mounting flange 5 has a circumferential, cylindrical collar or sheet metal penetration 5.1, to which a flange section 5.2 is connected.

[0035] A cover 7 is placed on the fastening flange 5 or the fastening screws 6, which has web-shaped spacers 7.1 and hollow cylindrical spacers 7.2 on its underside for the positive reception of the heads of the fastening screws 6. The cover 7 can be manually removed from the fastening screws 6 for cleaning the drain body 2.

[0036] The upper housing section 2.2 and the lower housing section 2.1 define an interior space 8, which is accessible from the inlet opening (feed opening) 9 formed in the upper housing section. A drain connection 10 is formed on the lower housing section 2.1, to which a drain pipe 11 can be connected. For this purpose, the drain connection 10 has an external thread 12, so that the drain pipe 11 inserted into the drain connection 10 can be connected to the drain connection 10 in a sealing and force-fitting manner using a union nut 13.

[0037] The drain housing 2, specifically the lower housing part 2.1, further comprises a partition 14 between the interior space 8 and the drain connection 10, which partition defines an overflow edge 15. The partition 14 is an integral component of the drain housing 2 and is integrally connected to the lower housing part 2.1. The lower housing part 2.1, together with the partition 14, defines a receiving space 16 for receiving sealing water. The lower housing part 2.1 has a shoulder (base) 2.11 extending outward relative to the receiving space 16, which merges into a housing wall 2.12 extending upwards towards the upper housing part 2.2. The housing wall 2.12, the shoulder (base) 2.11, and the partition 14 define an annular drainage channel 17 that opens into the drain connection 10. The bottom 2.11 of the annular drain channel 17 is inclined towards the drain nozzle 10.

[0038] Furthermore, the drain fitting comprises an immersion pipe 19 which is inserted into the housing 2 and can be removed therefrom and which, together with the cup-shaped section 20 of the lower housing part 2.1 and the partition wall 14, forms an odor trap. The immersion pipe 19 has a collar 19.1 at its upper end, with which it can be inserted into the inlet opening 9 of the drain housing 2 in a form-fitting manner. The collar 19.1 protrudes radially outwards relative to the tubular section 19.5 of the immersion pipe 19. A handle (not shown) is preferably provided in the upper end of the immersion pipe 19 so that the immersion pipe can be easily grasped and pulled out of the drain housing 2. The free cross-sectional area of ​​the immersion pipe 19 is significantly larger than the free cross-sectional area of ​​the drain connection 10 (cf. Fig. 7 ). In the illustrated embodiments, the free cross-sectional area of ​​the immersion tube 19 is, for example, more than 1.5 times the free cross-sectional area of ​​the drain nozzle 10. It can be seen that the interior 8 of the drain housing 2 is easily accessible for cleaning purposes after removal of the immersion tube 19.

[0039] The immersion tube 19 has, from its lower end to its upper collar 19.1, a non-circular cross-sectional profile with a tube wall section 19.2 which is assigned to the wall section 14.1 of the partition wall 14 (cf. Fig. 8 bis 11 ). The pipe wall section 19.2 has an outer profile into which the inwardly curved partition wall section 14.1 projects. Furthermore, the immersion tube 19 has a radially outwardly projecting inlet surface section 19.3, which, when the immersion tube 19 is inserted, projects outwardly beyond the inwardly curved partition wall section 14.1 (cf. Fig. 3 ). The inlet surface section 19.3 is inclined from the collar 19.1 of the immersion tube to its tubular section 19.5. In the area of ​​its collar 19.1 and in the area of ​​its tubular section 19.5, the immersion tube 19 has vertically extending recesses or niches 19.6, which serve to positively accommodate screw bosses 2.13, 2.21 formed in the lower housing section 2.1 and the upper housing section 2.2.

[0040] The annular immersion pipe collar 19.1 can be used to cover and seal a cavity 22 located at the shower tray floor opening between the drain housing 2 and the mounting flange 5, in which, without the covering provided by the collar 19.1, dirt pockets can form. In order to be able to cover cavities 22 of different heights depending on the design of the tray floor opening and thus prevent the formation of dirt pockets, the collar 19.1 has a certain height when delivered, which can be adjusted to the height of the cavity 22 to be covered by vertical shortening. The immersion pipe collar 19.1 lies tightly against the collar or sheet metal penetration 5.1 of the mounting flange 5.

[0041] To facilitate the most level, right-angled cutting of the dip tube collar 19.1 relative to the longitudinal center axis of the dip tube 19, the collar 19.1 has a plurality of vertically alternating annular collar sections 19.11, 19.12, which differ from one another in terms of material hardness and / or collar wall thickness. The different collar sections 19.11, 19.12 of the dip tube 19 can be realized by two- or multi-component injection molding. The respective harder collar section or collar section with a smaller wall thickness facilitates the guidance of a cutting tool when shortening the collar 19.1.

[0042] For example, the annular collar 19.1 of the immersion tube 19 in the unshortened delivery state has at least four, preferably at least six, particularly preferably at least eight such collar sections 19.11, 19.12.

[0043] The collar sections 19.11, 19.12 are vertically alternating, preferably made of a soft component, for example an elastomer or a polyolefin, and a hard component, preferably of thermoplastic material, particularly preferably polypropylene. Furthermore, the collar 19.1 is dimensioned such that, when the immersion tube 19 is inserted, it forms a press fit or transition fit with the fastening flange 5. Preferably, the press fit or transition fit of the collar 19.1 with the fastening flange 5 is effected by at least one of the annular collar sections 19.12 made of a soft component. As shown in particular in Fig. 8 As shown, the annular collar sections 19.12, made of a soft component, protrude outwardly relative to the annular collar sections 19.11, made of a hard component. The section 19.12 of the immersion tube collar, made of a soft component, which abuts the sheet metal passage or collar 5.1 of the mounting flange 5, together with the latter, forms a seal for the cavity 22.

[0044] The partition wall 14 defining an overflow edge 15 is designed to be flexibly deformable, so that a section of the overflow edge 15 can be deformed into a trough shape by mechanical pressure (cf. Fig. 12 and 13). Thus, a section of the housing 2 located behind the partition 14, viewed in the direction of flow of the wastewater, is also easily accessible for cleaning purposes. In order to be able to flexibly deform or fold over the partition 14 at the overflow edge 15 into a trough-shaped shape, the partition 14 is made, for example, from a soft component, preferably from an elastomer or a polyolefin. In contrast, the lower housing part 2.1 and the upper housing part 2.2 are preferably made from a hard component, for example from a thermoplastic material, particularly preferably from polypropylene. The one-piece connection of the partition 14 and the lower housing part 2.1, which are made from different components, can be achieved by two-component or multi-component injection molding.

[0045] The partition wall 14 is in particular flexibly deformable in such a way that a section of the overflow edge 15 can be deformed laterally in the direction of the interior 8 of the housing 2 in a trough-shaped manner by the action of pressure (cf. Fig. 13 and 14 ).

[0046] In the Figuren 5 and 14It can be seen that the partition wall 14 has a wall section 14.1 which is curved inwards in the direction of the interior space 8 or immersion pipe 19 and whose concave side faces the drain connection 10. In the area of ​​the section 14.1, the partition wall is flexibly deformable such that a section of the overflow edge 15 can be deformed laterally into a trough in the direction of the drain connection 10 by the application of mechanical pressure. Furthermore, the partition wall section 14.1 is connected to the partition wall 14 in a liquid-tight manner via a substantially U-shaped thin section 14.2. The thin section 14.2 can also be referred to as a tear-off groove or tear-off edge. It facilitates cutting out or tearing out the wall section 14.1 in applications not according to the invention which do not require an odor trap function of the drain fitting.Such applications exist, for example, in Southern Europe, where drainage systems are required which have a central floor drain 21 with odour trap, through which all water-discharging sanitary items, in particular shower trays, with the exception of toilets, are drained (cf. . Fig. 1 ). In such drainage systems with central odor trap, the drain fitting according to the invention can also be operated in a non-inventive state without the immersion pipe 19 and without the removable wall section 14.1 of the partition wall 14.

[0047] The implementation of the invention is not limited to the embodiments illustrated in the drawings. Rather, numerous variants are conceivable, which make use of the invention disclosed in the claims even if the design differs from the illustrated embodiments.

Claims

1. Drain set, in particular for shower trays or bath tubs, with a drain housing (2) which has an interior (8) accessible from an upper inlet opening (9), with a drain connection piece (10) projecting from the drain housing, with a partition wall (14) defining an overflow edge (15) between the interior (8) and the drain connection piece (10), with a dip tube (19) inserted into the drain housing (2) and removable therefrom and forming part of an odour trap, and with a fixing flange (5) for fixing the drain housing (2) to a drain opening of a shower or bath tub, characterised in that the dip tube (19) has a shortenable annular collar (19.1) which has a plurality of annular collar sections (19.11, 19.12) which alternate with one another in the vertical direction and which differ from one another by a different material hardness and / or by a different collar wall thickness, the annular collar (19.1) having at least four, preferably at least six, such collar sections (19.11, 19.12), and wherein the collar (19.1) can be used to cover a cavity (22) in the area of the drain opening of the shower or bathtub between the drain housing (2) arranged on the underside of the bathtub base and the fastening flange (5) arranged on the upper side of the bathtub base when the drain set is installed.

2. Drain set according to claim 1, characterised in that the annular collar sections (19.11, 19.12) are manufactured vertically alternately from a soft component, preferably from an elastomer or from a polyolefin, and from a hard component, preferably from thermoplastic material, particularly preferably from polypropylene.

3. Drain set according to claim 2, characterised in that the annular collar sections (19.12) made of a soft component protrude outwards in relation to the annular collar sections (19.11) made of a hard component.

4. Drain set according to one of claims 1 to 3, characterised in that the collar (19.1) of the dip tube (19) is dimensioned such that it forms an interference fit or transition fit with the fastening flange (5) when the dip tube (19) is inserted.

5. Drain set according to one of claims 1 to 4, characterised in that the collar (19.1) has vertically extending niches (19.6) for the form-fit reception of screw domes (2.13, 2.21) formed in the drain housing (2).

6. Drain set according to one of claims 1 to 5, characterised in that the partition wall (14) has a curved wall section (14.1) which is curved inwards in the direction of the dip tube (19) and which faces the drain connection piece (10).

7. Drain set according to claim 6, characterised in that the curved wall section (14.1) of the partition wall (14), which is curved inwards in the direction of the dip tube, is connected to the partition wall (14) in a liquid-tight manner via a substantially U-shaped thin section (14.2).

8. Drain set according to claim 6 or 7, characterised in that the dip tube (19) has a non-circular cross-sectional profile with a tube wall section (19.2) which is associated with the inwardly curved wall section (14.1) of the partition wall (14), wherein the tube wall section (19.2) has an outer profile into which the wall section (14.1) of the partition wall (14) projects or engages in a form-fitting manner.

9. Drain set according to one of claims 6 to 8, characterised in that the dip tube (19) has a radially outwardly projecting inlet surface section (19.3) which, in the inserted state of the dip tube (19), projects outwards over the inwardly curved wall section (14.1) of the partition wall (14).

10. Drain set according to one of claims 1 to 9, characterised in that the partition wall (14) is flexibly deformable in such a way that a section of the overflow edge (15) can be deformed in the shape of a trough by the action of mechanical pressure.

11. Drain set according to one of claims 1 to 10, characterised in that the partition wall (14) is flexibly deformable in such a way that a section of the overflow edge can be deformed laterally in the direction of the interior (8) of the outlet housing (2) in the shape of a trough by the action of mechanical pressure.

12. Drain set according to one of claims 1 to 11, characterised in that the partition wall (14) is flexibly deformable in such a way that a section of the overflow edge (15) can be deformed laterally in the direction of the drain nozzle (10) in the shape of a trough by the action of mechanical pressure.

13. Drain set according to one of claims 1 to 12, characterised in that the outlet housing (2) is composed of a lower housing part (2.1) and an upper housing part (2.2), wherein the lower housing part (2.1) together with the partition wall (14) defines a receiving space (16) for receiving sealing water, wherein the lower housing part (2.1) has a shoulder (2.11) extending outwards relative to the receiving space (16), wherein the shoulder (2.11) merges into a housing wall (2.12) extending upwards in the direction of the upper housing part (2.2), and wherein the housing wall (2.12), the shoulder (2.11) and the partition wall (14) define a drain channel (17) which opens into the drain connection piece (10).

14. Drain set according to one of claims 1 to 13, characterised in that the partition wall (14) is made of a soft component, preferably of an elastomer or of a polyolefin.

15. Drain set according to claim 13 or 14 in combination with claim 13, characterised in that the lower housing part (2.1) and / or the upper housing part (2.2) are made of a hard component, preferably of thermoplastic material, particularly preferably of polypropylene.