Drain closure, basin with drain closure and method for accumulating a medium

Abstract

The invention relates to a drain closure (1) for selectively accumulating or draining a medium from a basin into a drain pipe, which comprises a closure element (2) having a first and second sealing surface (3, 4), wherein the closure element (2) has a closure body (5) and, preferably, an opening (6) in the closure body (5). A cover element (7) covers the closure element (2), wherein the first sealing surface (3) is arranged such that a seal can be realised between the cover element (7) and the closure element (2), and the second sealing surface (4) is arranged such that a seal can be realised between the closure element (2) and the drain pipe, wherein the closure element (2) has a sealing position and a draining position, wherein in the sealing position, a seal is present between the cover element (7) and the closure element (2).

Description

[0001] Drain closure, basin with drain closure and method for damming a medium

[0002] A drain closure, a basin and a method for damming a medium are disclosed.

[0003] Closure devices for drains from liquid basins are already known, where a plug simply closes the outlet. This makes it possible for water to accumulate in a basin. To ensure that the basin cannot overflow, it is known to provide an overflow. Such an overflow can be a second opening in the ceramic through which the liquid can drain when a certain water level is reached. It is also known to install a type of overflow pipe in the plug, into which the water can also drain when the water reaches a certain height. It is also known to integrate concealed overflows into ceramics. These provide a liquid line inside the ceramic, invisible to the user, which also ensures that the liquid drains when a certain water level is reached, despite the overflow plug.

[0004] All of these overflow solutions have one problem in common: the overflows are difficult or impossible to clean and / or are visually unsightly. The area around the pool is usually humid and often warm, so that germs, bacteria and dirt get stuck in the overflow pipes and are impossible to remove, especially in the case of concealed overflows. Furthermore, the water in the pool is in contact with the stored water in the overflow, so that the germs pass directly into the stored water. Germs from the open overflows also pass into the air and are thus distributed directly into the respiratory tract of the pool user. When chemical cleaning agents are used in the open overflows, the weaker germs in particular are removed, but the stronger ones remain and can develop even more effectively.This creates a solid, stationary biofilm containing germs that are not easily affected by the cleaning agent.

[0005] It is therefore the object of the invention to create a drain closure which avoids the disadvantages of the prior art and in particular enables the accumulation of a medium in a basin and at the same time is easy to clean, easy to operate and visually appealing.

[0006] The object is achieved by a drain closure, a basin and a method for damming a medium according to the independent claims.

[0007] In particular, the object is achieved by a drain closure for optionally damming or draining a medium, in particular water, from a basin into a drain pipe. The drain closure comprises a closure element with a first and a second sealing surface. The closure element has a closure body and preferably an opening in the closure body. The drain closure further comprises a cover element which covers the closure element, wherein the first sealing surface is arranged such that a seal can be achieved between the cover element and the closure element and the second sealing surface is arranged such that a seal can be achieved between the closure element and the drain line. The closure element has a sealing position and a drain position, wherein in the sealing position there is a seal between the cover element and the closure element.This type of drain closure enables the drain to be opened when a desired, predefined water level is exceeded due to the water pressure created below the first sealing surface. The tight connection between the cover element and the closure element eliminates any potential water pressure on the closure element from above, allowing the closure element to be lifted as soon as the water pressure exceeds the weight of the closure element. This enables a simple and reliable overflow without additional piping in the ceramic. For this purpose, the closure element is movably mounted in the cover element. In the sealing position, it is held in position by gravity. In the drain position, the force of the medium on the closure element is greater than its weight.

[0008] In the drain position, the closure element can be positioned so that there is no seal between the drain pipe and the closure element, so that the medium can drain away.

[0009] In the drain position, the second sealing surface is moved away from the drain pipe so that the water can drain away. This is made possible by the water pressure once a desired water level has been reached.

[0010] The first sealing surface may comprise a first sealing element and in particular the second sealing surface may comprise a second sealing element, wherein the sealing surfaces preferably have a transverse distance of at least 2 mm from one another.

[0011] A sealing element can be an elastic sealing element such as a rubber element, a sealing ring, a sealing lip, or similar. The sealing element can be applied to the sealing surface, welded, glued, or inserted into a groove. It is also possible for the closure element to be provided with a coating that optimizes the sealing effect, such as a plastic coating or rubber coating.

[0012] A transverse distance between the two sealing surfaces creates a point of attack for the water pressure, allowing the closure element to be lifted by the water pressure. The transverse distance between the sealing surfaces is exclusively the distance in the transverse direction. It is also possible for the sealing surfaces to be spaced in a direction perpendicular to the transverse direction.

[0013] The arrangement of a sealing element on the sealing surface improves the sealing ability and thus leads to a safe storage of water in a basin.

[0014] The first and second sealing surfaces may have a height difference of at least 2 mm.

[0015] In this case, the sealing surfaces are spaced apart vertically, which can be present alone or in addition to the transverse spacing. The greater the distance between the seals, the more surface area is exposed to the medium and thus the greater the pressure on the closure element. Thus, the distance between the sealing surfaces can be used to determine the desired retention height of the medium and, on the other hand, the sensitivity of the response of the closure element to opening when the desired height is reached or exceeded.

[0016] A contact surface can be formed between the first sealing surface and the second sealing surface, which, in the sealing position, is in contact with a surrounding medium. The contact surface allows contact with the surrounding medium and is simultaneously the exclusive effective surface to which pressure is applied until the desired medium height is reached or exceeded.

[0017] The first sealing surface can be connected to the cover element in such a way that there is always a seal between the closure element and the cover element.

[0018] It can therefore be a fixed, tight connection, or an elastic connection that allows for a certain amount of spring travel. It can also be a spring, an elastic plastic, or a rubber.

[0019] In this way, an air bubble always remains between the first sealing surface and the cover element, and there is no media contact within the cover element above the first sealing surface of the closure element. In the drain position, this air bubble remains between the cover element and the first sealing surface, and by reducing the space in the drain position, the air exerts pressure on the closure element. This pressure should be taken into account when determining the desired media height for draining the medium, so that reliable opening of the closure element is ensured when the desired media height is reached.

[0020] It is possible to provide a venting device in the cover element so that the air beneath the cover element is also released when the closure element is moved, thus preventing additional pressure from the air being exerted on the closure element. The second sealing surface can be designed to be movable relative to the first sealing surface.

[0021] The closure element thus forms a kind of bellows, and the second sealing surface is moved toward the first sealing surface when the media pressure exceeds the desired level. This enables media to flow from the surrounding basin into the drainpipe.

[0022] In the drain position, the first sealing surface may not be in contact with the cover element and thus be spaced apart from the cover element. This allows media flow between the cover element and the closure element, as well as between the closure element and the drain pipe, while, in particular, the relative position of the first sealing surface and the second sealing surface remains constant.

[0023] In this embodiment, the entire closure element is lifted by the media pressure from the desired media height, and the medium can flow around the closure element in the area of ​​the first and second sealing surfaces. This is particularly advantageous if the closure element also includes a central opening, as the water drainage volume is then larger.

[0024] The opening of the closure element can have an opening area of ​​at least 70 mm 2 , preferably at least 200 mm 2 have .

[0025] The opening area is the cross-section through the closure element through which water can flow, thus guaranteeing a sufficient drainage volume flow.

[0026] The closure element can have a density of at least 2 gr / cm 3 at 25 ° , preferably a density of at least 5 gr / cm 3 at 25 ° and particularly preferably a density of at least 7 gr / cm 3 at 25 ° .

[0027] In particular, it is important that the sealing element has a greater density than the surrounding medium. When a sealing element is made of different materials, the effective density of the complete sealing element is relevant. Examples of possible materials for the sealing element include brass, copper, steel, or aluminum. These materials can also have a coating to protect them against corrosion and / or improve the sealing effect on the sealing surfaces. A coating can be a rubber coating, a plastic coating, and / or a hydrophobic coating or surface structure.

[0028] A lifting device can be designed with which the closure element can be positioned in such a way that the sealing position cannot be reached.

[0029] With such a lifting device, the drain can be used easily without blockage, as if there were no closure element present. Nevertheless, the closure element is located above the drainpipe, thus improving its appearance and preventing fluid from being fed directly into the drainpipe from above.

[0030] The lifting device can be integrated in the drain closure and can be realized by a mechanical lifting such as a thread, a spring-loaded push button or similar.

[0031] The cover element comprises a sealing surface whose smallest cross-sectional area is smaller than the largest cross-sectional area of ​​the closure element. This results in the cover element enclosing the closure element, and the closure element remains at least partially within the cover element. This effectively creates a loose form fit, ensuring a seal is always maintained while simultaneously guiding the closure element securely with sufficient clearance.

[0032] The weight of the closure element can be dimensioned such that it corresponds to the weight of the media column at a desired media height between and above the first and second sealing surface.

[0033] Thus, the closure element can be set to a desired media retention height and is automatically raised at this desired media height, thus creating an overflow. Since the medium is between and above the first and second sealing surfaces, it is a ring-shaped media column. The weight of the closure element required to achieve a media retention height h can be determined as follows: where

[0034] G v = Weight of the closure element h s = Height of the locking gap r o =Radius at upper sealing surface r u =Radius at lower sealing surface h=residual height of medium p=density of the medium.

[0035] Since it is only necessary to adjust the weight of the closure element, it is also possible to offer different desired media heights in a sink by providing closure elements of different weights in drain closures. Only the drain closure needs to be replaced. This is not possible with fixed overflows in a basin.

[0036] The problem is further solved by a basin, in particular a washbasin with a drain plug as described above, wherein the basin preferably does not comprise an overflow pipe or an overflow opening.

[0037] This type of basin features an overflow that isn't integrated into the ceramic. This makes the basin easy to clean and very hygienic, with no hidden cavities where germs and dirt can collect.

[0038] The basin can have a drain attachment that allows the drain closure to be positioned in the basin's drain. This allows the drain closure to be optimally positioned. The drain attachment can preferably be designed like existing drains and therefore usually includes a thread for screwing into the ceramic. This allows the drain closure and drain attachment to be integrated into any existing basin.

[0039] A drain pipe and a siphon can be formed adjacent to the drain, wherein the siphon can comprise a vent valve.

[0040] The vent valve can also be installed in the drainpipe or directly on the drain plug. The vent valve prevents the accumulation of air and thus unfavorable pressure conditions in the pipe. The ventilation valve can also counteract suction caused by incoming air. This type of suction can lead to the emptying of the odor trap in the siphon and is therefore undesirable.

[0041] The problem is further solved by a method for accumulating a medium, in particular water, in a basin up to a desired media height. A drain closure as described above is positioned in a drain of a basin, and when the desired media height is reached, at least the second seal on the second sealing surface, in particular simultaneously the seal on the first sealing surface, is opened by the media pressure, allowing the medium to flow away.

[0042] In the following, the invention is further explained in exemplary embodiments with reference to figures.

[0043] Figure 1 A cross-section of a first embodiment of a drain closure in the sealing position;

[0044] Figure 2 shows the drain closure from Fig. 1 in the drain position;

[0045] Figure 3 A cross-section of a second embodiment of a drain closure in the sealing position;

[0046] Figure 4 The drain plug from Figure 3 in the drain position;

[0047] Figure 5 A cross-section of a third embodiment of a drain closure in the sealing position;

[0048] Figure 6 The drain closure from Figure 5 in the exhaust air position; Figure 7 A cross-section of a fourth embodiment of a drain closure in the sealing position;

[0049] Figure 8 The drain plug from Figure 7 in the drain position;

[0050] Figure 9 A cross-section of an exemplary drain closure with a lifting device;

[0051] Figure 10 The drain plug from Figure 9 in the sealing position;

[0052] Figure 11 The drain plug from Figures 9 and 10 in the

[0053] Expiry posit ion;

[0054] Figure 12 A cross-section of a second embodiment of a lifting device;

[0055] Figure 13 A schematic sectional view of the annular media column corresponding to the weight of the closure element;

[0056] Figure 14 Perspective view of the annular water column from Figure 13;

[0057] Figure 15 Representation of the forces on a drain closure;

[0058] Figure 16 Another embodiment of a drain closure in the sealing position; Figure 17 The drain closure from Figure 16 in the drainage position;

[0059] Figure 18 Another embodiment of a drain closure in the sealing position;

[0060] Figure 19 The drain plug from Figure 18 in the drain position;

[0061] Figure 20 Another embodiment of a drain closure in the sealing position;

[0062] Figure 21 The embodiment of Figure 24 in the discharge position;

[0063] Figure 22 Another embodiment of a drain closure in the sealing position;

[0064] Figure 23 The drain plug from Figure 22 in the drain position;

[0065] Figure 24 Another embodiment of a drain closure in the sealing position;

[0066] Figure 25 The drain plug from Figure 24 in the drain position;

[0067] Figure 26 A basin with a drain plug.

[0068] Figure 1 shows a cross section through a drain closure 1 with a closure element 2. The closure element 2 has a closure body 5 and is annular and has annular sealing surfaces 3, 4. The first sealing surface 3 is in contact with the cover element 7 in the present sealing position. The second sealing surface 4 is in contact with a drain line. The closure body 5 is preferably provided with a plastic coating in order to improve the seal on the sealing surfaces 3, 4. The annular closure element 2 has an opening 6 in its center. The largest outer radius of the closure element 2 is larger than the smallest inner radius of the cover element 7, which is located on the sealing surface 3. The sealing surface 3 is in contact with the cover sealing surface 10. A medium such as water is located above the cover element 7.Due to the seal on the sealing surface 3, it is not possible for the medium to penetrate into the interior below the cover element, but the medium can only come into contact with the closure element 2 between the sealing surfaces 3 and 4. The contact surface 8 on the closure element 2 is formed between the sealing surfaces 3 and 4. Therefore, apart from the contact surface 8, the medium cannot exert any pressure on the closure element 2. This is shielded by the cover element 7. The weight of the closure element 2 now determines how much pressure on the contact surface 8 is necessary to lift the closure element 2 and thus leave the sealing position and reach the drain position (see Fig. 2). For example, the closure element can be made of brass and in particular have a rubber-like coating to improve the seal.The drain closure 1 has annularly arranged webs 17, which, on the one hand, enable the positioning of the drain closure 1 and the cover element 7, but, on the other hand, also allow the medium access to the contact surface 8. The density of the closure element is in the range of 7 g / cm. 3, so that the density of the surrounding water as a medium is exceeded. The closure element is arranged above the drain 13. Figure 2 shows the drain closure from Figure 1 in the drain position. In this position, the closure element 2 has been lifted above the contact surfaces 8 by the media pressure and there is no longer any seal on the sealing surfaces 3 and 4. This enables media to flow through the drain closure 1 and prevents overflow of the basin 11. The media flow is indicated by arrows. Through the opening 6 in the closure element 2 and the lifting of the entire closure element 1, so that the sealing surfaces 3 and 4 are open, media can flow through the entire cover element 7 and the volume flow of the outflowing medium is relatively large.

[0069] Figure 3 shows an alternative embodiment of a drain closure 1, wherein only the geometric design of the closure element 2 differs from that in Figure 1. The closure element 2 has the first sealing surface 3, which is in contact with the cover element 7. The closure element 2 also has the second sealing surface 4, which seals the drain closure towards the drain. The cover element 7 has a cover sealing surface 10, which has a smaller radius than the largest radius of the closure element 2. The closure element 2 is thus held loosely within the cover element 7 in a form-fitting manner. Due to this mobility, the media pressure on the contact surface 8 can lift the closure element 2 when a predefined pressure is exceeded, thus preventing the basin from overflowing. The first sealing surface 3 has a transverse distance and a vertical distance from the second sealing surface 4.The contact surface 8 has an effective portion which is determined by the transverse distance of the sealing surface 3 from the sealing surface 4. In this embodiment, it is advantageous if the closure element 2 is made of a heavy base material, since the volume of the closure element 2 is relatively small and a certain weight is necessary to achieve a desired retention height of the medium. Here too, the closure element 2 has an opening 6 through which medium can flow in the discharge position, shown in Figure 4. The embodiment shown here is in the sealing position.

[0070] Figure 4 shows the drain closure 1 from Figure 3 in the drain position. Apart from the geometric shape of the closure element 2, the principle and all other components correspond to the design of the drain closure in Figure 1. The media flow is indicated by arrows.

[0071] Figure 5 shows a further embodiment of a drain closure 1, in which the cover element 7 is again designed analogously to the cover element in Figures 1 to 4. In contrast to the previous figures, the closure element 2 is again geometrically shaped differently. The closure element 2 has a larger volume than the closure element 2 from Figure 4 and can therefore be made heavier or made from a different, lighter material. Here too, the closure element 2 has the sealing surfaces 3 and 4. A contact surface 8 is formed between the sealing surfaces 3 and 4. The contact surface 8 is accessible to the surrounding medium, whereas the sealing surface 3 on the closure element 2 in combination with the cover sealing surface 10 means that no medium can get into the interior of the drain closure below the cover element 7 in the sealing position.The webs 17 hold the cover element 7 in its position, if possible but simultaneously allow a medium flow to the contact surface 8. The closure element 2 is held in its position exclusively by gravity and is freely movable in the cover element 7. The opening 6 in the closure element 2 is conically shaped. On the one hand, the conical shape is easy to clean and, on the other hand, the resulting water flow in the open state leads to good self-cleaning.

[0072] Figure 6 shows the drain closure 1 from Figure 5 in the drain position. In this drain position, the sealing surfaces 3 and 4 are not in engagement with the cover element 7 or the drain 13, so that water can flow away unhindered. The media flow is indicated by arrows.

[0073] Figure 7 shows the drain closure 1, similar to Fig. 5, also in the sealing position. The only difference from Fig. 5 are the webs 17, which have a sealing elevation 20. In the sealing position, the sealing elevation 20 engages with the sealing surface 4 and thus seals the drain 13. The webs 17 above the sealing surface 4 are also arranged such that medium can flow between the individual webs 17.

[0074] Fig. 8 shows the drain closure 1 from Fig. 7 in the drain position. It is therefore a drain closure 1 analogous to Fig. 6, wherein the webs 17 with the sealing elevation 20 are designed analogously to Fig. 7.

[0075] Figure 9 shows an example of the embodiment shown in Figures 5 and 6 with a lifting device 9. Naturally, all embodiments shown in Figures 1 to 4 are equally conceivable. The lifting device 9 consists of a threaded sleeve 9a and a threaded rod 9b and is secured in the outlet 13.

[0076] By turning the cover device 7, the distance of the drain closure 1 from the drain 13 can be adjusted. This makes it possible to position the drain closure 1 so far away from the drain 13 that the closure element 2 with the sealing surface 4 no longer contacts the drain 13. This means that the water can easily flow away at any time. By turning the cover element 7 downwards, the drain closure 1 is lowered until the closure element 2 with the sealing surface 4 touches the edge of the drain 13 again. Liquid or medium can then be stored in this position.

[0077] Figures 10 and 11 show the drain closure 1 from Figure 9, in which the lifting device 9 is turned down, so that the drain closure corresponds to the embodiments shown in Figures 5 and 6. Reference is therefore made to the corresponding description.

[0078] Figure 12 shows an alternative embodiment of a lifting device that operates with a push button. By pressing the cover element 7, the drain closure 1 is lowered, allowing backing up. By pressing again and using a spring within the lifting device 9, the drain closure 1 is raised and thus brought into a position in which no seal is possible between the closure element 2 and the edges of the drain 13. The drain element itself can correspond to any of the previously described embodiments.

[0079] Figure 13 shows a schematic representation of the annular water column above and between the sealing surfaces 3, 4. The weight of the closure element 2 corresponds to the weight of the water column ring between the first sealing surface 3 and the second sealing surface 4 up to the desired water height h. As soon as the water height exceeds the desired water height h, the pressure on the contact surface 8 of the closure element 2 is greater than its weight, and the closure element 2 is lifted from the sealing position into the drainage position. This is possible because the cover element 7 prevents the water from penetrating the upper side of the closure element 2, and thus the water force cannot act on the closure element 2 from above. This applies analogously to all embodiments. The weight of the closure element 2 for a desired media height h can be determined as follows:

[0080] In this case for water at 4 ° C the density p = 1 g / cm3 .

[0081] Figure 14 shows a perspective view of the water cylinder shown in Figure 13, shown in section. The volume of the resulting annular cylinder up to the contact surface, in conjunction with the density of the medium used, determines the required weight of the closure element.

[0082] Figure 15 shows the effective areas of the forces of the surrounding medium. The medium acts from above on the cover element 7 and from below on the contact surface 8. Thus, the cover element is fixed to the webs 17, and simultaneously, the water pressure at a predefined value is used to lift the closure element 2.

[0083] This principle applies analogously to all embodiments.

[0084] Figures 16 and 17 show a further embodiment in which the closure element 2 is fixed to the cover element 7 via an elastic sealing element 3a. Figure 16 shows the sealing position and Figure 17 the drainage position. The webs 17 with the sealing elevation 20 are designed analogously to Fig. 7. All other details correspond to the previous embodiments. Figures 18 and 19 represent a further embodiment in which the sealing surface 3 between the closure element 2 and the cover element 7 is formed by a further elastic element 3a. The elastic element 3a is designed here such that the water pressure of the closure element requires more force than the weight of the closure element provides, since the spring force of the elastic element 3a must also be overcome. The webs 17 with the sealing elevation 20 are designed analogously to Fig. 7.

[0085] Figures 20 and 21 illustrate the sealing and drainage positions of a further embodiment corresponding to the embodiment of Figures 18 and 19. The only difference is that the closure element 2 in Figures 20 and 21 has no opening, whereas Figures 18 and 19 include an opening. The webs 17 with the sealing elevation 20 are designed analogously to Figure 7.

[0086] Figures 22 and 23 show the sealing and drainage position of a further embodiment. The sealing surface 3 is tightly and firmly connected to the cover element 7. The closure element 2 is designed as a bellows and is compressed by sufficient water pressure. This opens the sealing surface 4 and allows water to flow. The webs 17 with the sealing elevation 20 are designed analogously to Fig. 7.

[0087] Figures 24 and 25 show a sealing and a drainage position of a further embodiment which essentially corresponds to the embodiments in Figures 5 and 6, with the difference that the closure element 2 has no opening.

[0088] All other features are identical. The webs 17 with the sealing elevation 20 are designed analogously to Fig. 7. Figure 26 shows a basin 11 with a drain closure 1 above a drain fastening 12. The drain fastening 12 can be screwed into the ceramic of the basin 11. The drain closure 1 is positioned on the drain fastening 12 and stands securely on its webs 17. A drain pipe 19 is arranged below the basin 11 via a seal 18. This can also be followed by a siphon (not shown). Because the drain closure 1 is used, no overflow solution is required in the ceramic, which results in a very hygienic basin and also makes it possible to use thinner-walled basins or wash bowls.

Claims

Patent claims 1. Drain closure (1) for selectively damming or draining a medium, in particular water, from a basin into a drain pipe, comprising a closure element (2) with a first and a second sealing surface (3, 4), wherein the closure element (2) has a closure body (5), and preferably an opening (6) in the closure body (5), and a cover element (7) which covers the closure element (2), wherein the first sealing surface (3) is arranged such that a seal can be achieved between the cover element (7) and the closure element (2) and the second sealing surface (4) is arranged such that a seal can be achieved between the closure element (2) and the drain line, wherein the closure element (2) has a sealing position and a drain position, wherein in the sealing position a seal between the cover element (7) and the closure element (2) is present.

2. Drain closure (1) according to claim 1, characterized in that in the drain position the closure element (2) is positioned so that there is no seal between the drain pipe and the closure element (2), so that the medium can drain away.

3. Drain closure (1) according to one of the preceding claims, characterized in that the first sealing surface (3) comprises a first sealing element (3a) and in particular the second sealing surface (4) comprises a second sealing element (4a), wherein the sealing surfaces (3, 4) preferably have a transverse distance of at least 2 mm.

4. Drain closure (1) according to one of the preceding claims, characterized in that the first and the second sealing surface (3,4) have a height distance of at least 2 mm.

5. Drain closure (1) according to one of the preceding claims, characterized in that a contact surface (8) is formed between the first sealing surface (3) and the second sealing surface (4), which contact surface is in contact with a surrounding medium in the sealing position.

6. Drain closure (1) according to one of the preceding claims, characterized in that the first sealing surface (3) is connected to the cover element (7) in such a way that there is always a seal between the closure element (2) and the cover element (7).

7. Drain closure (1) according to claim 6, characterized in that the second sealing surface (4) is designed to be movable relative to the first sealing surface (3).

8. Drain closure (1) according to one of claims 1-5, characterized in that the first sealing surface (3) is not in contact with the cover element (7) in the drain position and thus a media flow between the cover element (7) and the closure element (2) and between the closure element (2) and the drain pipe can be achieved, wherein in particular the relative position of the first sealing surface (3) and the second sealing surface (4) to one another remains the same.

9. Drain closure (1) according to one of the preceding claims, characterized in that the opening (6) of the closure closing element (2) an opening area of ​​at least 70mm 2 , preferably at least 200mm 2 , has.

10. Drain closure (1) according to one of the preceding claims, characterized in that the closure element (2) has at least a density of 2 g / cm 3at 25°C, preferably a density of at least 5 g / cm3 at 25°C and particularly preferably a density of at least 7 g / cm3 at 25°C.

11. Drain closure (2) according to one of the preceding claims, characterized in that a lifting device (9) is formed with which the closure element (2) can be positioned so that the sealing position cannot be reached.

12. Drain closure (1) according to one of the preceding claims, characterized in that the cover element (7) comprises a cover sealing surface (10) whose smallest cross-sectional dimension is smaller than the largest cross-sectional dimension of the closure element (2).

13. Drain closure (1) according to one of the preceding claims, characterized in that a weight of the closure element (2) is dimensioned such that it corresponds to the weight of the media column at a desired media height between and above the first and second sealing surface (3, 4).

14. Basin (11), in particular washbasin, with a drain closure (1) according to one of the preceding claims, wherein the basin preferably does not comprise an overflow line and an overflow opening.

15. Basin (11) according to claim 14, characterized in that the drain closure (1) has a drain fastening (12) with which the drain closure (1) can be positioned in the drain (13) of the basin (11).

16. Basin (11) according to one of claims 14 or 15, characterized in that a drain pipe (14) and a siphon (15) are formed adjacent to the drain (13), wherein the siphon (15) comprises a vent valve.

17. Method for damming a medium (16), in particular water, in a basin (11) up to a desired media height (h), wherein a drain closure (1) according to one of claims 1-13 is positioned in an outlet (13) of a basin (11) and when the desired media height (h) is reached, at least the second seal on the second sealing surface (4), in particular simultaneously the seal on the first sealing surface (3), is opened by the media pressure and the medium (16) can thus flow away.

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