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DE-102024132900-A1 - drain fitting

DE102024132900A1DE 102024132900 A1DE102024132900 A1DE 102024132900A1DE-102024132900-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

  • Thomas Gerig

Assignees

  • Bette Gesellschaft mit beschränkter Haftung & Co. K.G.

Dates

Publication Date
20260513
Application Date
20241111

Claims (16)

  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 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 Claim 1 or 2 , characterized in that the pipe bend (11) at the upper deflection (8) has a horizontal cross-section in the shape 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 (12) is arranged behind the pipe bend (11) 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 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 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 Claim 12 , characterized in that a seal (23) made of an elastic material is arranged at an edge of the recess (24).
  14. drain fitting according Claim 13 , characterized in that the seal (23) rests against an inner wall of the pipe bend (11) and forms a vertical sealing plane.
  15. 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).
  16. 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) by 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. 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 drain 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. Within the housing, the wastewater is guided from the inlet slot to an inlet channel, downwards to a lower deflection, an upflow channel, an upper deflection, and a drain pipe, so that the drain assembly can form a water seal by means of standing water when no wastewater is flowing through it. According to the invention, the drain pipe comprises a pipe bend in which the cross-section continuously tapers. The tapering of the cross-section at the pipe bend increases the flow velocity of the wastewater, which enhances the suction effect and results in a high drainage capacity. The tapering of the cross-section does not occur abruptly in a step, but rather along slopes or bends in order to minimize flow losses of the wastewater due to turbulence. 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 D-shaped cross-section at the upper deflection point, comprising three straight walls and an arc-shaped section connecting two walls. The arc-shaped section is preferably located on the outside of the pipe bend, and the central straight wall section on an inner side. Furthermore, the pipe bend can also have a vertical D-shaped cross-section at one end, comprising three straight walls and an arc-shaped section connecting two walls. The arc-shaped section is preferably located at an outer bend of the pipe bend. The distance between the arc-shaped section and the opposite straight wall can decrease, for example, by at least 10% from the beginning of the pipe stub at the upper deflection point to the end of the pipe stub, while the distance between the other two 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 entrance of the pipe bend, the distance between the curved section and the opposite straight wall, measured horizontally, can be between 34mm and 40mm. 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. The inlet channel tapers in the direction of flow, i.e., from top to bottom, so that even within the inlet channel... A slight increase in the flow velocity of the wastewater is achieved. Preferably, the upflow channel is essentially ring-shaped and tapers in the direction of flow, i.e., from bottom to top, thus further increasing the flow velocity. A partition between the inlet channel and the upflow channel can be formed by a side wall of a hood-shaped insert. Preferably, a transition section is arranged downstream of the bend in the d