EP2765249A1 - Outlet fitting for a toilet cistern - Google Patents

Abstract

The fitting (1) has a valve seat (13) arranged before an outlet opening (27) when viewed in a flow direction. A sealing element (4) i.e. valve plate, of an overflow pipe (11) operates together with the seat. The pipe is upwardly moved for triggering flushing. The pipe includes an inlet opening (9), an outlet opening (10), and a pipe wall (14), which circulates around a middle axis (M). A recess (16) is arranged in the wall in a lower region (17) of the overflow pipe. The lower region extends from the outlet opening upto the sealing element, which lies at a distance from the outlet opening.

Description

TECHNICAL AREA

The present invention relates to a drain fitting for a cistern according to the preamble of claim 1.

STATE OF THE ART

In the generally known drain fittings of the type mentioned flushing can be triggered by lifting the overflow pipe. The lifting of the overflow pipe is usually carried out with an actuating device having, for example, a button. After the release of a flush, the water stored in the cistern passes through gravity through the outlet opening in a drain pipe and finally into a toilet bowl or urinal. The purge is interrupted by the overflow pipe falling onto the valve seat. Such a flushing process is associated with noises that have different causes. To reduce these noises is in the pop-up according to the CH 676 263 A provided that on the underside of the valve disc, a body is arranged, which forms a gap at a rinse interruption just before the closing of the valve with the mouth edge of the outlet opening to increase the flow resistance at the mouth edge. This is intended to ensure that the valve disk experiences no great acceleration just before closing the valve and is moved largely silently into the closed position.

In the EP 1 854 926 For the purpose of reducing the flushing noise, it has been proposed to largely prevent the formation of vortices with a separating nozzle. Although good results could be achieved with this approach with regard to the reduction of noise, one would like to minimize the noises without additional parts because the Drain fitting after the EP 1 854 926 very expensive to produce.

It has also been observed that in the prior art flushing devices the overflow tube fills with water when it is flushed. So the water rises in the overflow pipe. At a slightly later time of flushing, the overflow pipe empties into the outlet nozzle. Consequently, therefore, the air column is shortened in the overflow pipe at the beginning of the flushing with the entry of the rinse water and then extended again during the rinsing process. The length of the air column determines the acoustic natural frequency of the overflow pipe. If now comes the natural frequency of the air column in the range of the excitation frequency band resulting from the water, acoustically very noticeable and disturbing Gurgelgeräusche occur.

In addition, loud gurgling noises can occur, which are generated by the detachment of the water flow at the cone in combination with the resonance frequency of the air column in the overflow pipe or standpipe.

PRESENTATION OF THE INVENTION

Based on this prior art, the invention has for its object to provide a drain fitting, which overcomes the disadvantages of the prior art. In particular, the noise should be further or largely minimized. Next, the drain set to be easier to produce.

This object is achieved by the drain fitting according to claim 1. The drain fitting for a cistern is arranged with a valve seat seen in the flow direction in front of an outlet opening, with a cooperating with this valve seat sealing element of an overflow pipe, which can be moved to trigger a purge up , The overflow tube comprises a circumferential around a central axis pipe wall, an inlet opening and an outlet opening. In the lower part of the overflow pipe at least one breakthrough is arranged in the pipe wall.

The arrangement of the at least one breakthrough has the advantage that the length of the air column can be reduced at the overflow pipe or with the length of the overflow pipe remains limited, whereby the minimum natural frequency of the overflow pipe can be increased. The air column can therefore not expand to a resonance-critical length. By increasing the minimum natural frequency, there is no frequency overlay with the frequency band of the excitation frequency, which is generated by the running rinse water. Thus, the resonances and the Gurgelgeräusche resulting from the resonances can be avoided.

By the breakthroughs so a secondary flow is allowed, which limit the column of air in the overflow pipe accordingly. This secondary flow also has a supporting effect on the volume flow and can also prevent water from rising very high at the start of the flushing process or reducing the level of the increase.

In addition, a very simple to produce element is provided, which greatly improves the general susceptibility to noises of such a waste set. Opposite the EP 1 854 926 This is a significant advantage because the fitting of an additional sleeve is eliminated. Next eliminates the placement of an additional component to prevent the Gurgelgeräusche. So it also saves material.

The lower region preferably extends from the outlet opening of the overflow pipe to the sealing element which is at a distance from the outlet opening, wherein the at least one opening is arranged between the pipe outlet and the sealing element. The at least one breakthrough is thus below the sealing element.

The at least one breakthrough extends completely through the pipe wall of the overflow pipe.

The at least one breakthrough is arranged in addition to the outlet opening. Consequently, the lower region comprises the lower part of the inner space and the pipe wall of the overflow pipe, the outlet opening and the at least one opening. Particularly preferably, the lower region consists of the lower part of the inner space and the pipe wall of the overflow pipe, the Outlet opening and the at least one breakthrough.

Preferably, the aperture extends along an axis which is substantially perpendicular to the central axis of the overflow tube. Alternatively, the axis along which the aperture extends is substantially perpendicular to the surface of the tube wall through which the aperture extends.

The overflow pipe preferably has a conical section extending at least partially over the lower region in the lower region, wherein the outer diameter of the overflow pipe decreases from the sealing element to the outlet opening of the overflow pipe. The overflow pipe thus runs conically in the lower regions at least in sections. The conical design has the advantage that acts by the flowing past the flushing water buoyancy on the overflow pipe.

Preferably, in the lower region between the sealing element and the conical section, the overflow tube extends cylindrically over a cylindrical section. Thus, in a preferred embodiment, the lower region after the sealing element has a cylindrical portion and a conical portion, the cylindrical portion lying between the conical portion and the sealing member.

Preferably, the at least one opening is arranged in the cylindrical section and / or in the conical section. The at least one aperture may also extend over the conical and cylindrical portions.

Preferably, a plurality of openings at regular intervals around the circumference are arranged in the overflow pipe.

Particularly preferably, the at least one breakthrough has a round cross-section. The breakthrough can also be referred to as opening or bore. Alternatively, the at least one aperture may also have a slot-like cross-section.

Preferably, the lower portion extends downwardly into one after the valve seat arranged outlet nozzle when the sealing element rests on the valve seat.

The outlet nozzle preferably has a rounded inlet region in the region immediately after the valve seat.

Further embodiments are given in the dependent claims.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1

eine Schnittansicht einer Ablaufgarnitur gemäss einer Ausführungsform der Erfindung;

Fig. 2

eine Schnittansicht einer Ablaufgarnitur ohne die erfindungswesentlichen Merkmale mit eingezeichneten Wasserstand im Spülkasten;

Fig. 3

eine Schnittansicht der Ablaufgarnitur nach der Fig. 1 mit eingezeichnetem Wasserstand; und

Fig. 4

eine schematische Darstellung der Frequenzentwicklung beim Ablauf des Spülwasser durch die Ablaufgarnitur der Figur 1 und der Figur 2.

Preferred embodiments of the invention will be described below with reference to the drawings, which are given by way of illustration only and are not to be interpreted as limiting. In the drawings show:

Fig. 1

a sectional view of a pop-up waste according to an embodiment of the invention;

Fig. 2

a sectional view of a pop-up without the invention essential features with marked water level in the cistern;

Fig. 3

a sectional view of the waste according to the Fig. 1 with marked water level; and

Fig. 4

a schematic representation of the frequency development in the course of the rinse water through the drain fitting of FIG. 1 and the FIG. 2 ,

DESCRIPTION OF PREFERRED EMBODIMENTS

The FIG. 1 shows an inventive Ablaufgarnitur 1, which is fixed in a conventional manner in an opening 23 of a cistern 3. Of the known cistern 3 only one area of the bottom is shown here. It is designed in a known manner so that it can absorb water 26 up to a level 22. An overflow pipe 11 has at an upper end an inlet opening 9, which is above the level 22 of the water 26. The overflow pipe 11 is liftably mounted in a housing 2 and has a known float 12 and a closing weight 21. To trigger a flush, the overflow pipe 11 is raised with an actuating device, not shown here. In of the FIG. 1 the overflow pipe 11 is shown in the raised state. Here, a sealing element 4 is lifted from a valve seat 13, so that water 26 through the open valve according to the FIG. 2 can drain. The sealing element 4 is in communication with the overflow pipe 11 and the valve seat 13 is arranged on an outlet connection 8. The water 26 in this case flows through lateral openings 7 of the housing 2 in the outlet connection 8 and finally by a not shown with the outlet connection 8 in connection standing outgoing pipe in the auszuspülenden and not shown sanitary article. About the overflow pipe 11 can reach the outlet pipe 8 in a possible defect of the filling valve of the cistern, the rinse water so that it can not come to an overflow of the cistern.

In the FIG. 1 this flow is indicated by arrows 15. These arrows 15 correspond to the main flow. A portion of the water 26 of this main flow passes from below into the overflow pipe 11 and rises in this upwards.

In the FIG. 2 showing a waste set without the feature essential to the invention, the situation is shown before the complete emptying of the cistern. Below the overflow pipe 11 in the outlet pipe 10, an air cone 5 is typically formed in the second half of the rinsing process, because air is sucked down through the overflow pipe 11 by the flow conditions. Shortly after raising the overflow pipe 11, the rinse water rises in the overflow pipe 11. For example, to a level 18. Subsequently, the rinse water flows from the overflow pipe 11 in the direction of the outlet nozzle, wherein the drainage takes place at a higher speed as the drainage of the rinse water in the cistern. Consequently, it comes to the situation that in the overflow pipe 11 only air is present and in the cistern 3 flushing water 26 is present. This situation will be in the FIG. 2 shown. Through the air cone 5, an air column is formed from the tip 6 of the air cone 5 up to the inlet opening 9. This air column has a maximum height H1. The height H1 is essential for the natural frequency of the drain fitting 1, as described below in connection with the FIG. 4 is explained.

With reference to the FIGS. 1 and 3 An embodiment of the invention will now be described in more detail.

The drain fitting 1 according to the invention for a flushing cistern essentially comprises a valve seat 13, which, viewed in the flow direction, is arranged in front of an outlet opening 27. The valve seat 13 cooperates with a sealing element 4 of the overflow pipe 11. To trigger a purge, the overflow tube 11 is moved upwards, so that the contact between the sealing element 4 and the valve seat 13 is released. This position is shown in the figures. In the closed position, the sealing element 4 rests on the valve seat 13, so that no water can get out of the cistern through the outlet opening.

The overflow tube 11 has a circumferential around a central axis M tube wall 14, an inlet opening 9 and an outlet opening 10. The circumferential tube wall 14 defines an interior space 24, which is accessible through said inlet opening 9 and the said outlet opening 10. In the lower region 17 of the overflow pipe 11, at least one opening 16 is arranged in the pipe wall 14. The opening 16 has the function of reducing the height of the air column in the interior 24 of the overflow pipe 11. Rinse water penetrates through the opening 16 in the interior 24 in the lower region 17, wherein the area between the sealing element 4 and the valve seat 13 more or less complete filled with water, as in the FIG. 3 is shown. Due to the arrangement of the opening 16, the formation of an air cone 5 according to the FIG. 2 prevented, wherein the responsible for the natural frequency height of the air column from the height H1 (see FIG. 2 ) to the height H2 (see FIG. 3 ) are reduced. It can be significantly reduced by the reduction of the air column noise, in particular the Gurgelgeräusche during flushing, which in connection with the FIG. 4 will be explained in detail.

The lower region 17 extends from the outlet opening 10 to the sealing element 4. The sealing element 4 is spaced from the outlet opening 10. The at least one opening 16 is, as already mentioned above, in this lower area 17. Thus, the at least one breakthrough between the tube outlet 10 and the sealing element. 4

In principle, it can be said that the higher the at least one breakthrough 16, a better result can be achieved because the minimum natural frequency is corresponding is increased.

The at least one opening 16 extends completely through the pipe wall 14 of the overflow pipe 1 therethrough. Thus, an opening is provided which opens from the outside, outside the interior 24 of the overflow pipe 11, into the interior 24 of the overflow pipe 1.

The opening 16 extends along an axis A. The axis A is substantially perpendicular to the central axis M of the overflow pipe 11. Alternatively, the axis A can also extend at an angle to the central axis M. More preferably, the axis A is perpendicular to the surface through which the aperture extends. The at least one opening 16 is therefore a laterally arranged opening 16. Preferably, this opening 16 runs along an axis A that is transverse to the center axis M.

Of the FIGS. 1 and 3 can be well recognized that the overflow pipe 11 has in the lower region 17 via a conical portion 19 extending at least partially over the lower region. In other words, it can be said that the lower region 17 is conical at least in sections.

In the lower region 17 between the sealing element 4 and the conical section 19, the overflow tube 11 here has a cylindrical section 20. In the present embodiment, the lower portion 17 is thus formed by the conical portion 19 and the cylindrical portion 20, wherein the conical portion 19 between the cylindrical portion 20 and the sealing element 4 is located.

The at least one opening 16 is arranged here in the cylindrical section 20. Alternatively or additionally, the opening 16 may also be arranged in the conical section 19. It is also conceivable that the aperture extends from the cylindrical portion 20 into the conical portion 19.

The conical portion 19 creates by its shape buoyancy on the overflow pipe 11 so that it can be kept open with less force. In addition, the flow in the Area positively influenced during the flushing process.

Preferably, a plurality of apertures 16 are distributed at regular intervals around the circumference in the overflow pipe 11. In the embodiment shown, four circular openings 16, which may also be referred to as openings, are arranged. The four breakthroughs are spaced at an angle of 90 degrees to each other.

The shape of the breakthrough 16 does not play a decisive role in the function. It is important that the breakthrough extends through the pipe wall 14 therethrough. But are particularly preferred breakthroughs with a circular cross-section, as well as in the FIG. 1 will be shown. But it is also conceivable that the breakthrough, for example, has a slit-like cross-section. Also, the arrangement of many small openings is conceivable.

When the sealing element 4 rests on the valve seat 13, the lower region 17 extends downwards into the outlet connection 8 arranged downstream of the valve seat 13. The outlet connection 8 has a substantially cylindrical design. In the upper region, shortly after the valve seat 13 of the outlet nozzle 8 is formed on its inside with a rounded edge 25. This rounded edge 25 has a particular advantage on the water flow along the arrow 15 this particular in connection with the conical section 17th

Regarding the length of the lower portion 17, which in the FIG. 1 the reference L carries, it is particularly advantageous that this is smaller than the maximum diameter of the overflow pipe 11 in this lower region.

The overflow pipe 11 has a diameter of 28.5 mm in the present example. The circular openings 16 here have a diameter of 6 mm. Other dimensions are also conceivable.

In the FIG. 4 is the natural frequency E1 of the drain set without the invention essential feature and the natural frequency E2 of the drain set with the feature essential to the invention shown as a function of time. The time is shown on the X-axis and the frequency is shown on the Y-axis. At T0 the cistern is full and at T1 the cistern is empty. Next will be in the FIG. 4 shown the exciter frequency band EB of the running water. The natural frequencies decrease due to the leakage of water from the interior 14 of the overflow pipe 11 with decreasing water level in the interior 14.

Of the FIG. 4 can now be well recognized that with the drain fitting without the opening 16 in the lower area 17, the natural frequency E1 decreases with increasing emptying so that it falls into the exciter frequency band EB, which then comes to said Gurgelgeräuschen. The natural frequency is determined by the height H1 of the air column, which is determined according to the FIG. 2 extends from the tip 6 of the air cone 5 up to the inlet opening 9.

Due to the feature essential to the invention, ie the opening 16, the height H2 of the air column can now be reduced. As a result, the characteristic of the natural frequency E2 is changed. The minimum natural frequency thus increases that the minimum natural frequency E2 no longer enters the excitation frequency band EB, and thus prevents the formation of a resonance.

These effects with respect to the shortening of the air column in the overflow pipe 11 occur in particular when it comes to a full filling in the outlet pipe 8.

In the figures, we show a particularly preferred waste set. However, the design of the drain fitting may also be designed differently in the sense of the invention.

LIST OF REFERENCE NUMBERS

1

waste

2

casing

3

cistern

4

Sealing element (valve plate)

5

air cone

6

Top of the air cone

7

opening

8th

outlet connection

9

inlet opening

10

outlet opening

11

Overflow pipe

12

swimmer

13

valve seat

14

pipe wall

15

arrow

16

breakthrough

17

lower area

18

water level

19

conical section

20

cylindrical section

21

Weight

22

water level

23

opening

24

inner space

25

edge

26

water

27

outlet opening

D

diameter

L

length

H1

Height 1

H2

Height 2

E1

natural frequency

E2

natural frequency

T0

Cistern full

T1

Cistern empty

Claims (13)

Drain fitting for a cistern, with a valve seat (13) seen in the flow direction in front of an outlet opening (27), with a valve seat with this (13) cooperating sealing element (4) of an overflow pipe (11), which is for triggering a flush upwards can be moved, wherein the overflow pipe (11) around a central axis (M) circumferential tube wall (14), an inlet opening (9) and an outlet opening (10), characterized in that in the lower region (17) of the overflow pipe (11 ) in the pipe wall (14) at least one opening (16) is arranged. Drain fitting according to claim 1, characterized in that the lower region (17) extends from the outlet opening (10) to the sealing element (4) spaced from the outlet opening (10), wherein the at least one opening (16) between the tube outlet (16) 10) and the sealing element (4) is arranged. Drain fitting according to one of the preceding claims, characterized in that the at least one opening (16) extends completely through the pipe wall (14) of the overflow pipe (11). Drain fitting according to one of the preceding claims, characterized in that the opening (16) in addition to the outlet opening (10) is arranged, wherein the lower portion of the lying in the lower part of the pipe wall (14) and the interior (24) of the overflow pipe (11 ), the outlet opening (10) and the at least one opening (16) comprises or consists thereof. Drain fitting according to one of the preceding claims, characterized in that the opening (16) along an axis (A) extends, which is substantially perpendicular to the central axis (M), or which is substantially perpendicular to the surface of the pipe wall (14) through which the aperture (16) extends. Drain fitting according to one of the preceding claims, characterized in that the overflow tube (11) in the lower region (17) at least partially over the lower region (17) extending conical portion (19), wherein the outer diameter of the overflow pipe (11) from Sealing element (4) to the outlet opening (10) decreases. Drain fitting according to claim 6, characterized in that in the lower region (17) between the sealing element (4) and the conical portion (19), the overflow pipe (11) via a cylindrical portion (20) extends cylindrical. Drain fitting according to claim 7, characterized in that the at least one opening (16) in the cylindrical portion (20) and / or in the conical portion (19) is arranged. Drain fitting according to one of the preceding claims, characterized in that a plurality of openings (16) distributed at regular intervals around the circumference in the overflow pipe (11) are arranged. Drain fitting according to one of the preceding claims, characterized in that the at least one opening (16) has a round cross-section, and / or that the at least one opening (16) has a slot-like cross-section. Drain fitting according to one of the preceding claims, characterized in that the length (L) of the lower region (17) from the outlet opening (10) along the central axis (M) to the sealing element (4) is smaller than the maximum diameter of the overflow pipe (11 ) in this lower area (17). Drain fitting according to one of the preceding claims, characterized in that the lower region (17) extends down into a valve seat (13) arranged outlet pipe (8) when the sealing element (4) rests on the valve seat (13). Drain fitting according to one of the preceding claims, characterized in that the outlet nozzle (27) preferably in the region immediately after the valve seat (13) has a rounded inlet region (25).

Images