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EP-4741594-A1 - OUTLET FITTING

EP4741594A1EP 4741594 A1EP4741594 A1EP 4741594A1EP-4741594-A1

Abstract

A drain assembly (1) for sanitary bathtubs comprises a pot-shaped housing (2) and a cover (3) arranged on the housing (2), wherein an inlet gap (4) for wastewater is formed between the cover (3) and the housing (2), and the wastewater is guided into the housing (2) from the inlet flange (4) into an inlet channel (5) downwards to a lower deflection (6), an upflow channel (7), an upper deflection (8), and a drain pipe (10), wherein the drain pipe (10) includes a pipe bend (11) in which the cross-section continuously tapers. This allows the drain assembly (1) to provide a high drainage capacity in a compact design.

Inventors

  • GERIG, THOMAS

Assignees

  • Bette GmbH & Co. KG

Dates

Publication Date
20260513
Application Date
20251110

Claims (15)

  1. Drain fitting (1) for sanitary bathtubs, with a pot-shaped housing (2) and a cover (3) arranged on the housing (2), wherein an inlet gap (4) for wastewater is formed between the cover (3) and the housing (2), and the wastewater is guided into the housing (2) from the inlet gap (4) into an inlet channel (5) downwards to a lower deflection (6), an upflow channel (7), to an upper deflection (8) and a drain pipe (10), characterized in that the drain pipe (10) comprises a pipe bend (11) in which the cross-section continuously tapers.
  2. Drain fitting according to claim 1, characterized in that the pipe bend (11) at the upper deflection (8) has a horizontal cross-section which is at least 5% larger than a vertical cross-section at one end of the pipe bend (11).
  3. Drain fitting according to claim 1 or 2, characterized in that the pipe bend (11) at the upper deflection (8) has a horizontal cross-section in the form of a D with three straight walls and an arc-shaped section for connecting the two walls.
  4. Drain fitting according to one of the preceding claims, characterized in that the pipe bend (11) has at one end (11b) of the pipe bend (11) a vertical cross-section in the form of a D with three straight walls and an arc-shaped section for connecting the two walls.
  5. Drain assembly according to one of the preceding claims, characterized in that the inlet channel (5) is essentially ring-shaped and tapers in the direction of flow.
  6. Drain assembly according to one of the preceding claims, characterized in that the upflow channel (7) is essentially ring-shaped and tapers in the direction of flow.
  7. Drain fitting according to one of the preceding claims, characterized in that a transition section is provided behind the pipe bend (11). (12) is arranged and a rear end of the transition section (12) has a cylindrical cross-section.
  8. Drain fitting according to one of the preceding claims, characterized in that the upper deflection has a rounded overflow edge (9) with a radius of more than 2.0 mm, in particular between 2.5 mm and 7 mm.
  9. Drain fitting according to claim 8, characterized in that the rounded overflow edge (9) is double-walled in the shape of an inverted U.
  10. Drain fitting according to one of the preceding claims, characterized in that a bead-shaped lower edge (60) is provided on the lower deflection (6) which has a thickness in the horizontal direction of between 3 mm and 8 mm.
  11. Drain fitting according to one of the preceding claims, characterized in that a hood-shaped insert (20) is detachably fixed in the housing (2).
  12. Drain fitting according to claim 11, characterized in that the hood-shaped insert (20) has a recess (24) in a side wall through which an end of the pipe bend (11) is passed.
  13. Drain fitting according to claim 12, characterized in that a seal (23) made of an elastic material is arranged at an edge of the recess (24), wherein the seal (23) preferably abuts an inner wall of the pipe bend (11) and forms a vertical sealing plane.
  14. Drain fitting according to one of the preceding claims, characterized in that the drain pipe (10) comprises a stepped pipe stub, the rear cylindrical section (14) of which has a larger diameter than a front cylindrical section (13), wherein a lower wall of the front cylindrical section (13) is aligned with a lower wall of the rear cylindrical section (14).
  15. Drain fitting according to one of the preceding claims, characterized in that a clamping ring (27) is mounted on the housing (2), which is fixed to the housing (2) with several screws (28) and one of the screws (28) is arranged above an end of the pipe bend (11).

Description

The present invention relates to a drain fitting for sanitary bathtubs, with a pot-shaped housing and a lid arranged on the housing, wherein an inlet gap for wastewater is formed between the lid and the housing, and the wastewater is led into the housing from the inlet flange into an inlet channel downwards to a lower deflection, an upflow channel, to an upper deflection and a drain pipe. In the WO 2018/208257 A2 The diagram shows a drainage arrangement in which a pot-shaped housing is fixed to the drain of a sanitary basin. A lid with protruding ribs is inserted into the housing, so that incoming water is first guided over a lower deflector and then directed into an upward-facing pipe stub. From this pipe stub, the wastewater flows to a drain outlet connected to the housing. The wastewater flows along sections of constant cross-section and steps where the cross-section and flow direction change abruptly. This results in high flow losses, leading to low drainage capacity. EP 2 586 921 A1 The diagram reveals a shower drain with an integrated siphon. Wastewater flows from an annular inlet channel to an annular upflow channel within the inlet channel. The upflow channel is followed by a deflection into an angled pipe bend with a step between two cylindrical sections of essentially constant cross-section, leading to a drain pipe. The object of the present invention is therefore to create a drain fitting for a sanitary bathtub which has an optimized drainage performance at a low installation height. This problem is solved with a drain assembly having the features of claim 1. The drainage assembly according to the invention comprises a pot-shaped housing and a lid arranged on the housing, wherein an inlet slot for wastewater is formed between the lid and the housing. The wastewater flows downwards from the inlet slot into an inlet channel within the housing. The drain assembly is led to a lower deflection, an upflow channel, an upper deflection, and a drain pipe, so that standing water can create a water seal when no wastewater is flowing through it. According to the invention, the drain pipe includes a pipe bend in which the cross-section continuously tapers. This taper increases the flow velocity of the wastewater, enhancing the suction effect and resulting in high drainage capacity. The taper is not abrupt, occurring in a single step, but rather along slopes or curves to minimize flow losses due to turbulence. Preferably, the taper extends over at least 80% of the length of a curved line passing through the centers of the respective cross-sections of the pipe bend. The centroid of a cross-sectional area forms the center point through which the curved line passes. Preferably, the pipe bend has a horizontal cross-section at its beginning at the upper deflection point that is at least 5% larger than a vertical cross-section at one end of the pipe bend. The pipe bend is thus bent at approximately 90° from the upper deflection point. The cross-section can decrease from the upper deflection point to the end of the pipe bend by, for example, between 8% and 20%. Optionally, the pipe bend is formed wholly or partially integrally with the housing. The pipe bend can optionally be formed in one piece or it can be composed of several parts. The tapering of the pipe bend is preferably asymmetrical, and the pipe bend can, for example, be bent substantially along a quarter circle at an outer curve, while an inner curve is substantially parabolic. The pipe bend has a horizontal cross-section in the shape of a D with three straight walls and an arc-shaped section connecting two walls at the upper deflection. The arc-shaped section is preferably located on the outside of the pipe bend, and the middle straight wall section on an inside side. Furthermore, the pipe bend can also have a vertical cross-section in the shape of a D with three straight walls and an arc-shaped section connecting two walls at one end. The arc-shaped section is preferably located at an outer curve of the pipe bend. The distance between the arc-shaped section and the opposite straight wall can vary from the beginning of the pipe stub at the upper deflection to the end of the The diameter of the pipe stub, for example, can be reduced by at least 10%, while the distance between the two other walls remains constant. At the end of the pipe bend, it has a height of, for example, only 28 mm to 32 mm, so that the overall height of the pot-shaped housing can be kept low, for example, in a range between 50 mm and 56 mm. At the inlet of the pipe bend, the horizontal distance between the curved section and the opposite straight wall can be between 34 mm and 40 mm. In a preferred embodiment, the inlet channel is essentially annular. The inlet channel need not form a complete ring, as it is interrupted in the area of the outlet pipe. Furthermore, screw channels can be provided on the housing, allowing the cross-section of the essentially annular inlet channel to vary.