Outlet closure for retaining a medium or allowing it to drain from a liquid reservoir, and outlet system comprising an outlet closure and an outlet siphon

Abstract

The invention relates to an outlet closure (1) for retaining a medium (2) or allowing it to drain from a liquid reservoir (3) into an outlet pipe (4). The outlet closure (1) comprises a cover (5), a first retaining wall (9) and a second retaining wall (10). The first retaining wall (9) is connected to the cover (5) in an airtight manner. A first retained volume (11) is arranged between the first retaining wall (9) and the second retaining wall (10). The second retaining wall (10) is designed such that it can be sealingly connected to the outlet pipe (4). The invention also relates to an outlet system having an outlet closure (1) and an outlet siphon (20).

Description

[0001] Drain closure for storing or draining a medium from a liquid reservoir and drainage system comprising a drain closure and a drain siphon

[0002] The present invention relates to a drain closure for damming or draining a medium from a liquid reservoir and to a drainage system comprising a drain closure and a drain siphon.

[0003] Drainage closures for damming or draining a medium from a liquid reservoir are known from the prior art. In order to avoid flooding and water damage, drainage closures must be designed in such a way that an overflow device is formed that prevents the liquid reservoir from overflowing. The overflow devices known from the prior art have the disadvantage that they are difficult to access and therefore difficult to clean. These are usually openings in the reservoirs themselves or devices in the reservoir's drainage system. A biofilm forms in the overflow devices, which emits unpleasant odors and is unhygienic. In addition, the overflow devices known from the prior art are bulky and require a lot of space that cannot be used for other purposes.

[0004] It is the object of the invention to overcome the disadvantages of the prior art and in particular to create a drain closure and a drainage system which can be operated safely, is easy to clean and is compact.

[0005] The object is achieved by a drain closure for damming or draining a medium from a liquid reservoir and by a drainage system for damming or draining a medium comprising a drain closure and a drain siphon according to the independent patent claims.

[0006] In particular, the object is achieved by a drain closure for damming or draining a medium from a liquid reservoir into a drain pipe. The drain closure comprises a cover, a first dam, and a second dam. The first dam is connected to the cover in an airtight manner. A first dam volume is arranged between the first dam and the second dam. The second dam can be sealingly connected to the drain pipe.

[0007] Such a drain closure is simple in design, easy to clean and also very compact and allows a dedicated drainage of accumulated water at a defined water height.

[0008] It is possible for the first baffle wall and the cover to be connected by a thread. There can be a sealing ring between the first baffle wall and the cover. The sealing ring can be an O-ring. It is possible for the cover to be pushed, i.e. clamped, onto the first baffle wall. When the cover is in the target position, it clicks onto the first baffle wall and preferably penetrates into a recess in the first baffle wall. The cover is then arranged in a form-fitting manner on the first baffle wall. This means the cover can be fitted easily and securely. In this variant, too, a seal is preferably arranged between the cover and the first baffle wall so that the connection is airtight.

[0009] It is possible for the second baffle to be placed onto the drainpipe. This makes it possible to equip an existing liquid reservoir, for example a wash basin, with a handle during use and to provide a drain plug of this type if liquid is to be stored in the liquid reservoir. If no liquid is to be stored in the liquid reservoir, the drain plug can be removed from the drainpipe by a user and the liquid will drain away. The drain plug then acts as a sealing plug with an integrated overflow protector. Using a drain plug of this type, it is possible to easily seal off a container that does not have an overflow device in a way that is safe from overflow.

[0010] A drain plug can be formed as a single piece, for example, as an injection-molded part. It is also possible for a drain plug to be formed from two injection-molded parts that are connected, for example, by means of two threads or by plugging them together. Such a drain plug is simple and inexpensive to manufacture.

[0011] It is possible for a clamping surface to be formed beneath the second retaining wall. The clamping surface can be conical. The clamping surface can be designed such that the drain closure can be clamped into a drain pipe using the clamping surface. The clamping surface can be elastic so that the clamping surface is slightly compressed when the drain closure is inserted into the drain pipe. The clamping surface then exerts a force radially in the direction of the drain pipe and the drain closure is force-fittingly connected to the drain pipe. The force-fitting connection between the drain closure and the drain pipe is designed such that the drain closure is not lifted out of the drain pipe by hydrostatic buoyancy when a liquid is admitted to the liquid reservoir and the drain closure is surrounded by the liquid.However, the drain plug can be removed from the drain pipe by a user with average muscle strength without the need for tools.

[0012] Such a drain closure is therefore simple in design, inexpensive to manufacture and user-friendly in application. The first retaining wall and the second retaining wall can be connected by means of webs. The first retaining wall and the second retaining wall can be connected by means of three, four or five webs. The second retaining wall can have a clamping collar. The clamping collar acts as a stop when the drain closure is inserted into a drain pipe with the clamping surface. A user who inserts the drain closure into a drain pipe receives haptic feedback when the drain closure has been inserted into the drain pipe up to the clamping collar. This makes it easy for the user to determine when the drain closure has been correctly inserted into the drain closure. The drain closure is therefore simple and user-friendly in design.

[0013] A seal can be arranged on the second dam. Sealingly connectable to the drain pipe means that the second dam and the drain pipe are arranged such that essentially no fluid can penetrate the space between the second dam and the drain pipe. It is of course possible to arrange a seal as part of the second dam between the second dam and the drain pipe. The second dam and the drain pipe are therefore also sealingly connected if there is a seal between the second dam and the drain pipe, even if the second dam and the drain pipe are not touching.

[0014] The first dam wall and / or the second dam wall can be partially designed essentially in the shape of a hollow cylinder shell or a hollow truncated cone shell. It is possible for the second dam wall to be located inside the hollow space formed by the first dam wall. It is also possible for the first dam wall and / or the second dam wall to be at least partially designed like the shell surface of a hollow cuboid. The drain closure is then elongated. A drain closure of this type can be used in an area in which a larger area is to be drained, for example in a shower. It is also possible for the first dam wall and / or the second dam wall to be at least partially designed like the shell surface of a hollow cube.

[0015] The first dam wall is preferably designed such that in an installation situation a distance is formed between the dam wall end and the liquid reservoir, so that liquid can flow through between the dam wall end and the liquid reservoir.

[0016] The entire drain cover can be made of plastic or a combination of plastics. It is also possible for the entire drain cover to be made of brass and / or chrome steel. A combination of the above materials is also possible. The key is that the drain cover is made of sturdy, corrosion-resistant materials and is cost-effective to manufacture.

[0017] The medium may be a fluid. The medium may be water, where water is understood to mean a medium that primarily comprises water but may also contain other components such as soap residue and / or dirt particles.

[0018] The liquid reservoir can be, for example, a sink, a shower tray, or a bathtub. The liquid reservoir can also be larger, such as a swimming pool or, in an industrial application, another large basin.

[0019] It is possible that the cover is convex.

[0020] The cover can be designed so that it is convex and curved upwards, against the force of gravity. Such a convex design of the cover ensures that a medium located on the cover can flow from the cover under the force of gravity into an area next to the drain closure and from the area next to the drain closure into the drain closure. Such a design of the cover therefore ensures that as little liquid as possible remains in the liquid reservoir when the liquid drains away. In addition, a convex cover is easily accessible for a user and can be easily cleaned. Furthermore, the space under the cover is optimized and the flow behavior of the liquid in the drain closure when draining is also optimized.

[0021] It is possible for the outer shell of the cover to be shaped like a hemisphere. It is also possible for the convex cover to be shaped like part of an ellipsoid. The cover can be substantially rotationally symmetrical. The cover can be substantially linearly symmetrical in plan view. It is also possible for the cover to be elongated.

[0022] It is possible that the cover is formed in one piece with the first retaining wall.

[0023] This allows the drain closure to be constructed from a small number of parts, creating absolute airtightness between the cover and the first retaining wall. This makes the drain closure easy to manufacture and assemble. Furthermore, there are fewer mechanical interfaces between the individual components. This reduces the possibility of defects and makes the drain closure robust and durable.

[0024] One-piece means that the cover and the first baffle are not detachably connected. The cover and the first baffle can, for example, be made of plastic and manufactured using an injection molding process. It is also possible for the cover and the first baffle to be made of metal. The first baffle can be welded to the cover to form a one-piece part. It is also possible for the cover to be made of different materials. For example, the cover can be made of a stable, inexpensive and easy-to-work material and covered with an aesthetically pleasing and corrosion-resistant material.

[0025] It is possible for the distance between the second retaining wall and the cover to be a maximum of 5 mm. It is possible for the distance between the second retaining wall and the cover to be a maximum of 4 mm. It is also possible for the distance between the second retaining wall and the cover to be a maximum of 2 mm. A minimum distance between the second retaining wall and the cover is 1 mm, in particular 1.8 mm.

[0026] The distance refers to the vertical distance between the second retaining wall and the cover.

[0027] This allows for a compact design of the drain closure while simultaneously enabling fluid drainage in accordance with standards. The second retaining wall and the cover can be connected with a connecting element. The connecting element may have a support surface that can be placed on a support of a drainpipe. The connecting element may have a support surface that can be placed on a drain insert of a drainpipe.

[0028] Connecting the second retaining wall and the cover with a connecting element enables simple and efficient production of the drain closure and ensures a stable connection between the components. The formation of a support surface ensures that the drain closure can be advantageously applied to a drain pipe or drain insert. This makes it easy for the user to mount the drain closure on a drain pipe or remove it from the drain pipe for cleaning. This design makes the drain closure easy to maintain and handle.

[0029] The connecting element can comprise a lifting device. The lifting device can move the second retaining wall from a retaining position to a draining position. In the retaining position, the second retaining wall is sealingly connected to the drain pipe. In the draining position, the second retaining wall is not connected to the drain pipe.

[0030] The provision of a lifting device ensures that a user of the drain closure can easily switch from a storage function to a normal drainage function. At the same time, only one drain cover is visually visible, so that this type of drain cover is more easily accepted. A sealed connection means that essentially no liquid can penetrate between the second storage wall and the drain pipe. It is of course possible to arrange a seal between the second storage wall and the drain pipe. For a sealed connection, it is therefore not necessary for the second storage wall and the drain pipe to be in direct contact.

[0031] It is possible for the lifting device to be designed as a thread. The lifting device can, for example, comprise a trapezoidal thread. It is possible for the lifting device to be designed so that it can be clicked into place. The lifting device can then be brought into the storage position by exerting a vertical force and by lowering it from the drainage position, whereby a compression spring in the lifting device is pre-tensioned during the lowering process. As soon as the lifting device has reached the storage position, the lifting device engages and the drain closure is in the storage position. The lifting device can be unlocked by exerting a further vertical force on the lifting device. The lifting device then moves back into the drainage position due to the force of the pre-tensioned compression spring in the lifting device.The compression spring located in the lifting device is thus pre-tensioned by the vertical force that a user exerts on the lifting device when the user moves the lifting device from the drain position to the storage position. When a user unlocks the lifting device by exerting a vertical force, the compression spring of the lifting device presses the second storage wall away from the drain pipe against the force of gravity. The lifting device is preferably made of brass. A maximum of three webs can be arranged between the second storage wall and the cover or between the second storage wall and the connecting element.

[0032] The arrangement of a maximum of three bars ensures that no solid objects can become lodged between the bars or between the bars and the second retaining wall and the cover or connecting element, while still maintaining optimal stability of the drain cover. If the drain cover is installed in a sink, for example, it is extremely unlikely that the drain cover will become clogged by objects that have fallen into the sink or by hair. This arrangement makes the drain cover blockage-proof and therefore low-maintenance.

[0033] Even if the drain plug becomes blocked, it can be easily removed from the drain pipe and cleaned, as previously shown, so that if a blockage does occur, it can be removed simply and safely.

[0034] The removable drain plug also ensures that it can be cleaned in a standard dishwasher. This makes the drain plug extremely hygienic and allows the user to conveniently remove the plug from the drain pipe and easily clean it.

[0035] It is possible for the cover, the first baffle and the second baffle to be made of plastic and / or brass and / or chrome steel. It is also possible for the cover, the first baffle and the second baffle to be made of different materials. It is also possible for the cover, the first baffle and the second baffle to be made of a combination of different materials. It is also possible for the cover, the first baffle and the second baffle to be made of a stable, easy-to-work and inexpensive material that is covered with another corrosion-resistant material. In this way, the components are stable and inexpensive to manufacture and at the same time aesthetically pleasing.

[0036] The first storage volume can be annular. In this case, the first storage volume is essentially shaped like a portion of a hollow truncated cone or a portion of a hollow conical cylinder.

[0037] This design of the first storage volume ensures that the drain plug can be conveniently and space-savingly installed in a standard sink, shower tray, or bathtub. The drain plug is thus extremely compact and practical.

[0038] No webs can be formed between the second dam wall and the cover. The space between the second dam wall and the cover is therefore free of webs.

[0039] This ensures a simple and stable construction of the drain closure and ensures that no solids can become trapped between the second retaining wall and the cover. This design makes the drain closure blockage-proof and flow-optimized.

[0040] The second retaining wall can have a maximum height of 3 cm.

[0041] The second dam can also have a maximum height of 2 cm. The second dam can also have a maximum height of 1.2 cm. The second dam can also have a maximum height of 0.8 cm. The height of the second dam is measured vertically from the lower edge of the first dam, which forms a first overflow edge, to the upper edge of the second dam, which forms a second overflow edge. The height of the second dam is therefore the height that a medium must overcome against gravity and air pressure when the medium is flushed under the first dam and over the second dam.

[0042] The object is further achieved by a drainage system for damming or draining a medium from a liquid reservoir, comprising a drain closure as described above and a drain siphon. The drain siphon is arranged downstream of the drain closure.

[0043] A second storage volume can be formed in the drain siphon. The second storage volume can have a height that corresponds to a water seal height of the drain siphon. The first storage volume can be 1 to 1.15 times as large as the second storage volume. The first storage volume can be 1 to 1.1 times as large as the second storage volume. The first storage volume can also be 1 to 1.05 times as large as the second storage volume. It is possible for the first storage volume to be 1.125 times as large as the second storage volume.

[0044] If the first storage volume is larger than 1,125 times the size of the second storage volume, a gas mixture from the first storage volume is forced through the drain siphon into the further sewer system, automatically reducing the first storage volume. This is therefore the technical and physical limit up to which the system can be operated. If this limit is exceeded due to the design, the first storage volume is filled with the medium until the limit is automatically maintained again.

[0045] Such a system ensures the targeted drainage of standing water from the liquid reservoir. The medium in the drain siphon is pushed downstream along the sealing water level by the medium in the liquid reservoir and in the first retention volume of the drain closure.

[0046] This ensures that when the liquid reservoir is filled with a medium, the medium in the first storage volume rises more slowly than the medium in the liquid reservoir. This allows for a greater storage height in the liquid reservoir.

[0047] The first storage volume between the first storage wall and the second storage wall is slightly larger than the second storage volume in the siphon.

[0048] The first and second storage volumes are proportional to the storage height in the fluid reservoir. If the first and second storage volumes are increased, the storage height in the fluid reservoir also increases.

[0049] If the second storage volume is smaller than the first storage volume, the gas mixture is forced out of the drain pipe into the further sewer system, thereby reducing the effective first storage volume in the system. The first storage volume is preferably 3% to 15% larger than the second storage volume.

[0050] An overflow section is formed in an area between the overflow edge of the second retaining wall and the cover. The placement of a drain siphon downstream of the drainage system ensures that the drainage system is sealed against odors.

[0051] Due to the suction created by sufficient water pressure above the drain cap during the emptying of the reservoir, the siphon is also quickly emptied, creating a suction of its own. Thus, the entire system is emptied quickly and thoroughly until the pressure has equalized and a water column closes the siphon again.

[0052] The drain siphon can be a tubular siphon or a bottle siphon, for example. Other designs are also conceivable.

[0053] It is possible for a siphon to be arranged downstream of the drain closure, which siphon comprises a first inlet opening, a second inlet opening, a flow region, a deflection section and a flow-through pipe. The second inlet opening is located downstream of the first inlet opening. The first inlet opening can have a larger cross-section than the second inlet opening. The flow region connects the first inlet opening and the second inlet opening. The flow region is designed so that water can flow through it. The deflection section is located downstream of the second inlet opening and is curved. In cross-section, the deflection section has an outer wall with an outer radius and an inner edge with an inner radius, the outer radius being larger than the inner radius. The flow pipe is located downstream of the diversion section.The flow area is at least partially, preferably completely, conical in shape. The flow area can taper in cross-section in the direction of flow of the medium.

[0054] The flow is particularly advantageously achieved through a flow region with a tapered cross-section, and is accelerated in the process. This increases the suction effect of the siphoning principle, and the medium in the liquid reservoir can drain quickly through the drain closure and the siphon. It is also possible, as an alternative or in addition to the previously described siphon, to arrange a siphon downstream of the drain closure, which siphon comprises a first inlet opening, a second inlet opening, a flow region, a deflection section, and a flow pipe. The second inlet opening is located downstream of the first inlet opening. The first inlet opening can have a larger cross-section than the second inlet opening. The flow region connects the first inlet opening and the second inlet opening. The flow region is designed so that water can flow through it.The deflection section is located downstream of the second inlet opening and is curved. In cross-section, the deflection section has an outer wall with an outer radius and an inner edge with an inner radius, whereby the outer radius is larger than the inner radius. The flow pipe is located downstream of the deflection section. In the outlet, the second inlet opening is formed eccentrically in the deflection section, so that in cross-section it is located closer to the outer wall than to the inner wall.

[0055] Such an eccentric arrangement of the inlet opening closer to the outer wall in the diverter section ensures that the medium flows along the outer wall at a high velocity. This creates additional suction in the siphon and enhances the suction effect of the siphoning principle of the drain closure.

[0056] In the previously described siphon, the volume in the conical section is very small. This allows the drain closure to be constructed extremely compactly, since the volume in the conical inlet is crucial for the design of the first retention volume. Furthermore, the acceleration of the water in the conical section achieves a high flow velocity, which also leads to the required discharge volume in the drain closure.

[0057] It is possible for the drain pipe to comprise a drain insert, wherein the drain insert can be inserted into the drain pipe on the liquid reservoir and forms a support for the drain closure.

[0058] In this way, the drain cap can be advantageously and easily arranged in the drain pipe and also easily removed from it again. A user can therefore simply arrange the drain cap in the drain pipe and remove it again. The drain cap is therefore user-friendly and easy to apply and can be removed for cleaning. It is also possible for a user to arrange a drain insert and a drain over an existing drain siphon. A user can then create a drainage system from an existing drain siphon and a drain cap. Existing siphons can therefore be retrofitted to form a drainage system by fitting a drain insert and a drain cap.

[0059] The drain insert can be cylindrical. This allows the drain insert to be advantageously arranged in a drain pipe.

[0060] It is possible that the drain insert can be screwed into the drain pipe.

[0061] This ensures that the drain insert can be easily, securely, and securely positioned in the drain pipe. The thread on the drain insert and the drain pipe can, for example, be a trapezoidal thread.

[0062] It is possible for the drain insert to have one or more seals on its exterior that have a slightly larger diameter than the inside diameter of the drain pipe. The drain insert can then be positioned in the drain pipe, and the seal is compressed during the positioning process. The drain insert is then held in position both by gravity and by the seal connecting the drain insert to the drain pipe.

[0063] The drain insert may have a collar.

[0064] Such a collar clearly defines the penetration depth of the drain insert in the drain pipe and the drain insert can be arranged advantageously and precisely in the drain pipe.

[0065] The invention is explained in more detail in the following figures. They show:

[0066] Figure 1 : A schematic diagram of a drainage system with a

[0067] Drain siphon and a medium in the drain siphon,

[0068] Figure 2 : a schematic diagram of a drainage system with a

[0069] Medium in a drain siphon and a medium in a liquid reservoir,

[0070] Figure 3 : a schematic diagram of a drainage system with a

[0071] Medium in a drain siphon, the liquid reservoir and a medium between a first dam wall and a second dam wall,

[0072] Figure 4 : a schematic diagram of a drainage system with a

[0073] Medium in a liquid reservoir, a drain siphon and between a first dam and a second dam, the medium flowing partially downstream,

[0074] Figure 5 : A schematic diagram of a drainage system which is essentially completely filled with a medium, the medium flowing downstream,

[0075] Figure 6 : A section of a drainage system, where the

[0076] Drain plug is in the storage position,

[0077] Figure 7 : A section of a drainage system which has a tubular siphon,

[0078] Figure 8: A section of a drain closure which is in the drain position and in which the first retaining wall and the cover are formed in one piece,

[0079] Figure 9: a section through a drain closure which is in the storage position, in which the first storage wall and the cover are formed in one piece,

[0080] Figure 10: A section through a drain closure which is in the drainage position, wherein the first retaining wall and the cover are not formed in one piece, Figure 11: A section through a drain closure which is in the storage position, wherein the cover and the first retaining wall are not formed in one piece,

[0081] Figure 12 : An exploded view of a drain plug,

[0082] Figure 13 : A view of a drain plug in the

[0083] stowage position,

[0084] Figure 14 : A view of a drain closure in the drain position,

[0085] Figure 15 : A section of a drainage system, where a

[0086] Medium in the drain siphon,

[0087] Figure 16: A section through a drainage system, with a medium in the drain siphon and in the liquid reservoir,

[0088] Figure 17: A section through a drainage system, with a medium in the drainage siphon, the liquid reservoir and between the first dam wall and the second dam wall,

[0089] Figure 18: A section through a drainage system, wherein the medium is formed in the liquid reservoir and downstream essentially completely in the drainage system, Figure 19: A section through a drainage system, wherein the medium is formed in the liquid reservoir and partially in the drainage siphon,

[0090] Figure 20: A schematic diagram of a drainage system with a first storage volume and a second storage volume,

[0091] Figure 21: A schematic diagram of a drainage system with a first storage volume and a second storage volume, as well as a first storage diameter and a second storage diameter,

[0092] Figure 22 : A schematic diagram of a drainage system with a first storage volume and a second storage volume as well as a sealing water height,

[0093] Figure 23 : A view of a drain closure with a

[0094] clamping surface,

[0095] Figure 24 : A view of a drain closure with a

[0096] clamping surface and a clamping collar,

[0097] Figure 25 : A bottom view of a drain closure,

[0098] Figure 26 : A side view of a drain closure,

[0099] Figure 27 : A section of a drain closure with a

[0100] clamping surface,

[0101] Figure 28 : A section of a drain closure with a

[0102] clamping surface and a drain insert, Figure 29: A view of a drain closure with a

[0103] Expiry use,

[0104] Figure 30 : A section of a drain closure with a

[0105] clamping surface and a clamping collar,

[0106] Figure 31 : A section of a drain closure with a

[0107] clamping surface and a clamping collar as well as a drain insert,

[0108] Figure 32 : A view of a drain closure with a

[0109] Collar and a first overflow edge and a drain insert.

[0110] Figure 1 shows a schematic diagram of a drainage system 28 with a drain siphon 20 and a medium 2 in the drain siphon 20. The drainage system 28 has a drain closure 1. The drain closure 1 is arranged in a liquid reservoir 3. Downstream of the drain closure 1 is the drain pipe 4. A drain siphon 20 is formed downstream of the drain pipe 4. The drain closure 1 has a first dam wall 9 and a second dam wall 10. A first dam volume 11 is formed between the first dam wall 9 and the second dam wall 10. A first dam diameter 38 is formed between the first dam wall 9 and the second dam wall 10. A second dam volume 40 with a second dam diameter 39 is formed in the drain siphon 20. The second dam diameter 39 is the diameter 39 of the drain pipe 4.The first dam diameter 38 of the first dam volume 11 is slightly larger than the second dam diameter 39 of the second dam volume 40, so that the first dam volume 11 is slightly larger than the second dam volume 40. The height 19 of the second dam wall 10 corresponds to the sealing water height 21 of the drain siphon 20. The first dam wall 9 has a first overflow edge 23. The second dam wall 10 has a second overflow edge 24. The dam height 19 is formed between the first overflow edge 23 and the second overflow edge 24. The overflow section 25 is formed downstream of the dam height 19 and at a level above the second overflow edge 24. In addition, the drain closure 1 has a cover 5. The distance 26 is formed between the second dam wall 10 and the cover 5. The medium 2 is formed in the drain siphon 20. The drain siphon 20 has a water seal height 21.The second storage volume 40 is filled with the medium 2. The first storage volume 11 is not filled with the medium 2. Rather, the first storage volume 11 contains a gas mixture.

[0111] Figure 2 shows a schematic diagram of a drainage system analogous to Figure 1. Unlike Figure 1, in Figure 2 a medium 2 is present in the liquid reservoir 3. In Figure 2, the medium 2 is formed in the liquid reservoir 3 up to a height of the first overflow edge 23 of the first retaining wall 9.

[0112] Figure 3 shows a schematic diagram of a drainage system analogous to Figures 1 and 2. Unlike in Figures 1 and 2, the liquid reservoir 3 in Figure 3 is almost completely filled with the medium 2. In addition, the first storage volume 11 between the first storage wall 9 and the second storage wall 10 is partially filled with a medium 2. The medium 2 in the liquid reservoir 3 pushes the gas in the drain pipe 4 downstream into the drain siphon 20 so that the medium 2 in the drain siphon 20 overcomes the sealing water height 21 of the siphon. When the liquid reservoir 3 is filled, the medium rises into the first storage volume 11 between the first storage wall 9 and the second storage wall 10 through the principle of communicating tubes. The gas in the discharge pipe 4 exerts a force on the medium 2 in the first storage volume 11, so that the medium 2 does not rise as quickly in the region of the first storage volume 11 as in the liquid reservoir 3.The medium 2 in the drain siphon 20 is pushed up the sealing water level 21 against the force of gravity in the drain siphon 20. The second storage volume 40 is thus filled by a gas mixture (not shown) from the drain pipe 4. The medium 2 in the first storage volume 11 and the medium 2 in the drain siphon 20 communicate with each other according to the principle of communicating tubes. When the medium 2 penetrates into the first storage volume 11 due to the hydrostatic pressure of the medium 2 in the liquid reservoir 3, the medium 2 in the drain siphon 20 is pushed back against the force of gravity in the direction of the further sewerage system. The medium 2 in the drain siphon 20 exerts pressure on the gas mixture in the drain pipe 4, which is located between the medium 2 in the first storage volume 11 and the medium 2 in the drain siphon 2. The gas mixture in the outlet pipe 4 exerts a pressure on the medium 2 in the first storage volume 11.Due to this pressure, the medium 2 in the first storage volume 11 rises more slowly when the liquid reservoir 3 is filled with a medium 2 than in the liquid reservoir 3. The interaction of the medium 2 in the drain siphon 20 and the medium 2 in the first storage volume 11 of the drain closure 1 thus enables a large storage height in the liquid reservoir 3.

[0113] Figure 4 shows a schematic diagram of a drainage system analogous to Figures 1 to 3. Unlike in Figures 1 to 3, air bubbles slowly form in the drain siphon and in Figure 4 the medium 2 flows downstream from the drain siphon 20 over the sealing water height 21 into the further sewerage system. The medium 2 is in the liquid reservoir 3 and in the first storage volume 11 between the first storage wall 9 and the second storage wall 10 and up to the height of the second overflow edge 24. Due to the gas pressure in the drain pipe 4, which is exerted by the medium 2 in the liquid reservoir 3, the medium 2 in the drain siphon 20 is pushed downstream against gravity and overcomes the sealing water height 21 of the drain siphon 20.The medium 2 in the drain siphon is thus pressed downstream in the direction of the further sewerage system by the hydrostatic pressure of the medium 2 in the liquid reservoir 3, thereby overcoming the sealing water height 21 of the drain siphon 20 and thus reaching the further sewerage system.

[0114] Figure 5 shows a schematic diagram of a drainage system analogous to Figures 1 to 4. In Figure 5, unlike in Figures 1 to 4, the water flows from the liquid reservoir 3 past the first drainage edge 23 through the area of ​​the first storage volume 11 between the first storage wall 9 and the second storage wall 10 over the second overflow edge 24 through the overflow section 25 into the drain pipe 4 and then through the second storage volume 40 and into the drain siphon 20. The medium then overcomes the water seal 21 of the siphon and flows into the rest of the sewerage system. In Figure 5, unlike in Figures 1 to 4, the first storage volume 11, the second storage volume 40, the overflow section, the drain pipe 4 and the drain siphon 20 are completely filled with the medium 2.In this state, the medium 2 is sucked out of the liquid reservoir 3 through the drain closure 1 by means of the siphon principle in the direction of the drain siphon 20 and in the direction of the further sewer system (not shown). The medium thus flows from the liquid reservoir 3 through the drain closure 1, the drain pipe 4 and the drain siphon 20 in the direction of the further sewer system (not shown). Figure 6 shows a section through a drainage system with a drain closure 1, wherein the drain closure 1 is in the storage position. The same reference numerals designate the same components as in Figures 1 to 5. In Figure 6, the cover 5 and the first storage wall 9 are formed in one piece. The drain closure 1 is the drain closure 1 from Figure 8. The details of the drain closure 1 can be found in the description of Figure 8.In Figure 6, the drain closure 1 is in the storage position. The liquid reservoir 3 is designed as a wash basin. The wash basin essentially has the shape of a hollow hemisphere. Due to the hydrostatic pressure of the medium 2 in the liquid reservoir 3, the medium 2 in the drain siphon 2 is pressed against gravity over the water seal 21 of the drain siphon 20 in the direction of the further sewerage system. The drain siphon 20 is designed as a bottle siphon. The second storage volume 40 is partially filled with the medium 2. The second storage volume 40 has a second storage diameter 39. The second storage diameter 39 corresponds to the diameter of the drain pipe 4.

[0115] Figure 7 shows a section through a drainage system analogous to Figure 6. Unlike in Figure 6, the drainage siphon 20 is designed as a tubular siphon.

[0116] Figure 8 shows a section through a drain closure 1 which is in the drain position. The drain closure 1 has a first retaining wall 9 and a cover 5. The first retaining wall 9 and the cover 5 are formed in one piece. The first retaining volume 11 is formed between the first retaining wall 9 and the second retaining wall 10. The overflow section 25 is formed downstream of the first retaining volume 11. The second retaining wall 10 has a retaining height 19. A vertical distance 26 is formed between the second overflow edge 24 of the second retaining wall 10 and the cover 5. The first retaining wall 9 has a first overflow edge 23. The drain closure 1 also has a lifting device 17. The lifting device 17 is essentially cylindrical. The lifting device 17 is part of the connecting element 13. The connecting element 13 connects the second retaining wall 10 to the cover 5 .The lifting device 17 lifts the cover 5 as well as the first baffle 9 and the second baffle 10. The drain closure 1 is in the drainage position and a medium (not shown) can flow downstream of the drain closure without the medium having to pass through the first baffle volume. Furthermore, the drain closure 1 has a support surface 14 and a support 15. The drain closure 1 is applied to the support 15 by means of the support surface 14. The drain closure also has a drain insert 16 with an inner wall 37. The drain closure 1 can be introduced into a drain pipe (not shown) using the drain insert 16. The drain insert 16 has a contact surface 27. The contact surface 27 can be made, for example, from rubber or another elastic material. In Figure 8, the contact surface 27 of the drain insert 16 is ribbed.This ensures a good hold in a drain pipe (not shown). The drain closure 1 also has a seal 12. The seal 12 floats in the air and in this state does not seal the second baffle 10 against the drain insert 16. The drain insert 16 also has a collar 22. The collar 22 enables the drain insert 16 and thus the drain closure 1 to be arranged precisely and securely in a drain pipe (not shown). The first baffle volume 11 is annular. Both the first baffle 9 and the second baffle 10 are in the shape of a truncated cone. The cover 5 is connected to the connecting element 13 by means of a first thread 29. The connecting element 13 is connected to the drain insert 16 by means of a second thread 30. The drain closure 1 has support wings 31.The support wings 31 support the drain closure 1 via the support surface 14 on the support 15.

[0117] Figure 9 shows a drain closure 1 analogous to Figure 8. Unlike in Figure 8, the drain closure 1 in Figure 9 is designed in the storage position. In the storage position, the seal 12 seals the second storage wall 10 against the inner wall 37 of the drain insert 16. The seal 27 is sealingly connected to the inner wall 37 of the drain insert 16. A medium (not shown) can therefore flow through the drain closure past the first overflow edge 23, through the first storage volume 11, past the second overflow edge 24, through the overflow section 25 and downstream. In the first storage volume 11, the medium must therefore overcome the force of gravity and flows downstream against the force of gravity through the first storage volume 11 between the first storage wall 9 and the second storage wall 10.

[0118] Figure 10 shows a drain closure similar to Figures 8 and 9. Unlike in Figures 8 and 9, the cover 5 and the first baffle 9 are not formed as a single piece. Rather, the first baffle 9 and the cover 5 are two parts. The sealing ring 8 is arranged between the cover 5 and the first baffle 9. In Figure 10, the drain closure 1 is in the drainage position. In the area of ​​the first overflow edge 23, the first baffle is ring-shaped and has an inner diameter 34 of 59 mm. The second baffle 10 has a height 19 of 18 mm. The height of the second baffle 10 is the vertical distance 19 between the first overflow edge 23 and the second overflow edge 24. The cover 5 is rotationally symmetrical and has an outer diameter 33 of 80 mm. The second dam wall 10 has an inner diameter 32 of 22 mm in the area of ​​the second overflow edge 24.A radial distance 36 of 6 mm is formed between the second overflow edge 24 and the lifting device 17. In the drain position, in which the drain closure 1 is located, the first overflow edge 23 and the collar 22 have a vertical distance 35 of 13 mm.

[0119] Figure 11 shows a section through a drain closure similar to Figure 10. Unlike in Figure 10, the drain closure 1 in Figure 11 is in the storage position. The function of the storage position in Figure 11 is similar to that in Figure 9. The distances 32, 33, 34 and 36 are the same in Figure 11 as in Figure 10. The vertical distance 35 between the first overflow edge 23 and the collar is smaller in Figure 11, in which the drain closure 1 is in the storage position, than in Figure 10. In the storage position (Figure 11), the vertical distance 35 between the first overflow edge 23 and the collar 22 is 3.5 mm. From the discharge position (Figure 10) into the storage position (Figure 11), the first storage wall 9, the second storage wall 10 and the cover 5 are thus lowered by 9.5 mm by the lifting device 17 of the connecting element 13.During the lowering process, the second retaining wall 10 with the seal 12 is partially lowered through the collar 22 into the drain insert 16. During the lowering process, the seal 12 of the second retaining wall 10 comes into sealing contact with an inner wall 37 of the drain insert 16.

[0120] Figure 12 shows an exploded view of a drain closure 1. The drain closure 1 has a cover 5. A sealing ring 8 is arranged between the cover 5 and the first retaining wall 9. The drain closure 1 comprises a first retaining wall 9, a second retaining wall 10 and a first retaining volume 11. The first retaining volume 11 is located between the first retaining wall 9 and the second retaining wall 10. The second retaining wall 10 comprises a second overflow edge 24. The overflow section 25 is formed above the second overflow edge 24. In addition, the drain closure 1 comprises a seal 12 and a connecting element 13. The connecting element 13 is designed as a lifting device 17. The part of the drain closure with the first retaining wall 9 and the second retaining wall 10 can be lifted by the lifting device 17. Furthermore, the drain closure 1 has a support surface 14 and four webs 18.With the support surface 14 the drain plug can be placed on a support.

[0121] (not shown). The cover 5, the sealing ring 8, the first retaining wall 9, the second retaining wall 10 as well as the first retaining volume 11 and the seal 12 are rotationally symmetrical. The first retaining volume 11 is annular. Furthermore, the drain closure 1 comprises four support wings 31.

[0122] Figure 13 shows a view of a drain closure 1 in the storage position. The drain closure 1 has a cover 5. Furthermore, the drain closure 1 has a first overflow edge 23. The drain closure 1 has a first storage wall 9 and a seal 12, a support surface 14 and support wings 31. The cover 5, the first storage wall 9 and the seal 12 and the first overflow edge 23 are rotationally symmetrical.

[0123] Figure 14 shows a view of a drain closure similar to Figure 13. Unlike Figure 13, the drain closure is in the drain position. In the drain position, the lifting device 17 of the connecting element is located.

[0124] 13 in the raised position .

[0125] Figure 15 shows a section through a drainage system similar to Figure 7. Unlike in Figure 7, the medium 2 is located in the drain siphon 20 without any significant gas pressure acting on the medium 2 in the drain siphon in the drain pipe 4. Substantially no medium 2 is present in the liquid reservoir 13. The second storage volume 40 is completely filled with the medium 2. The first storage volume 11 is not filled with the medium.

[0126] Figure 16 shows a section through a drainage system 1 analogous to Figure 15. Unlike in Figure 15, in Figure 16 a medium is formed in the liquid reservoir 3. The medium 2 in the liquid reservoir 3 is drawn into the first storage volume 11 between the first storage wall 9 and the second storage wall

[0127] 10 and flows around the first overflow edge 23. The medium 2 in the liquid reservoir 3 exerts a hydrostatic pressure on the medium 2 in the drain siphon 20, so that the medium 2 in the drain siphon is pressed against the force of gravity over the sealing water level 21 of the drain siphon 20 in the direction of the further sewerage system (not shown). The medium 2 in the drain siphon 20 exerts pressure, analogous to Figure 3, by gravity on the gas mixture in the drain pipe 4, which is located between the medium 2 in the first suction volume

[0128] 11 and the medium 2 in the drain siphon 2. The gas mixture in the drain pipe 4 exerts a pressure on the medium 2 in the first storage volume 11. Due to this pressure, the medium 2 rises more slowly in the first storage volume 11 when the liquid reservoir 3 is filled with a medium 2 than in the liquid reservoir 3. The interaction of the medium 2 in the drain siphon 20 and the medium 2 in the first storage volume 11 of the drain closure 1 thus enables a large storage height in the liquid reservoir 3.

[0129] Figure 17 shows a section through a drainage system 28 analogous to Figures 15 and 16. Unlike in Figures 15 and 16, the medium 2 is located in the liquid reservoir 3 and in the first storage volume 11 and has penetrated to the level of the second overflow edge 24. The gas in the drain pipe 4 pushes the medium 2 downstream into the drain siphon 20 and in doing so overcomes the sealing water height 21 of the drain siphon 20. The first storage volume 11 is completely filled with the medium 2, while the second storage volume 40 is not filled with the medium 2. The volume of the first storage volume 11 , which is filled with the medium 2 , is slightly larger than the volume of the second storage volume 40 , from which the medium 2 is pressed by the hydrostatic pressure of the medium in the liquid reservoir and in the first storage volume 11 .

[0130] Figure 18 shows a section through a drainage system 28 analogous to Figures 15 to 17. Unlike in Figures 15 to 17, in Figure 18 the entire drainage system downstream of the first overflow edge 23 is flooded with the medium 2. The medium 2 is also formed in the liquid reservoir 3. Figure 18 shows the state in which the medium 2 flows from the liquid reservoir 3 past the first overflow edge 23 through the first storage volume 11 past the second overflow edge 24 through the drain closure 1 into the drain pipe 4 and from the drain pipe 4 through the second storage volume 40 and the drain siphon 20, the medium 2 overcoming the sealing water height 21 of the drain siphon 20. Figure 18 thus shows a dynamic state in which the medium 2 is sucked through the drainage system using the siphoning principle. Figure 19 shows a section through a drainage system 28 analogous to Figure 16.Figure 19 shows a static state of the drainage system. In this case, the medium 2 is in the liquid reservoir 3 as well as in the first storage volume 11 and the second storage volume 40. The medium 2 does not flow over the second overflow edge 24. The medium 2 is also not present in the overflow section 25. However, the medium 2 in the liquid reservoir 3 exerts pressure on the gas in the drain pipe 4 due to gravity. The gas in the drain pipe 4 presses the medium 2 downstream into the drain siphon 20, so that the medium 2 in the drain siphon 20 overcomes the sealing water height 21 against gravity and then flows downstream.

[0131] Figure 20 shows a schematic diagram of a drainage system 28 with a first storage volume 11 and a second storage volume 40 analogous to Figure 3. The first storage volume 11 has a first storage diameter 38 and a height 19 and the second storage volume 40 has a second storage diameter 39 and a sealing water height 21. The first storage diameter 38 is slightly larger than the second storage diameter 39. The height 19 corresponds to the sealing water height 21. The first storage volume 11 is thus slightly larger than the second storage volume 40.The storage height in the liquid reservoir 3 depends on the sealing water height 21 in the siphon because the stored medium 2 in the liquid reservoir 3 communicates with the medium 2 in the drain siphon 20 via the first storage volume 11, the gas in the drain pipe 4 and the second storage volume 40 according to the principle of communicating tubes, and the medium 2 in the drain siphon 20 pushes against gravity over the sealing water height 21 in the direction of the further sewerage system. In such a system, the first storage volume 11 must be slightly larger than the second storage volume 40. If the second storage volume 40 is smaller than the first storage volume 11, the gas mixture is pushed out of the drain pipe 4 into the further sewerage system (not shown), whereby the effective first storage volume 11 in the system is reduced. Preferably, the first storage volume 11 is 3% to 15% larger than the second storage volume 40.

[0132] Figure 21 shows a schematic diagram of a drainage system 28 with a first storage volume 11 and a second storage volume 40 as well as a first storage diameter 38 and a second storage diameter 39 analogous to Figure 20. Unlike in Figure 20, the first storage diameter 38 is larger than the second storage diameter 39. However, the second storage wall 10 has a lower height 19 than the sealing water height 21 of the drain siphon 20. The drainage system 28 therefore functions essentially analogously to the drainage system 28 in Figure 20.

[0133] Figure 22 shows a schematic diagram of a drainage system 28 with a first storage volume 11 and a second storage volume 40 as well as a sealing water height 21 analogous to Figure 20. Unlike in Figure 20, the first storage diameter 38 and the sealing water height 21 of the drain siphon 20 are larger in Figure 22. The first storage volume 11 is slightly larger than the second storage volume 40. With a larger first storage volume 11 and a larger second storage volume 40, a greater storage height in the liquid reservoir 3 is possible. The volume of the first storage volume 11 and the second storage volume 40 is proportional to the storage height of a medium in the liquid reservoir 3.

[0134] Figure 23 shows a view of a drain closure 1 with a clamping surface 41. The drain closure 1 has a cover 5 and a first retaining wall 9. The first retaining wall 9 has a first overflow edge 23. The clamping surface is arranged below the second retaining wall (not shown). The cover 5, the first retaining wall 9, the first overflow edge 23 and the clamping surface 41 are each rotationally symmetrical.

[0135] Figure 24 shows a view of a drain closure 1 with a clamping surface 41 and a clamping collar 42. The drain closure has a first retaining wall 9 and a second retaining wall 10. The retaining volume 11 is formed between the first retaining wall 9 and the second retaining wall 10. The first retaining wall 9 and the second retaining wall 10 are connected by means of three webs 18. The first retaining wall 9 has a first overflow edge 23 and the second retaining wall 10 has a second overflow edge 24. The drain closure 1 also has a cover 5. The overflow section 25 is formed between the second overflow edge 24 and the cover 5. The clamping surface 41 is formed as part of a jacket surface of a cone. The clamping surface 41 is thus conical and tapers towards the underside of the drain closure 1. The clamping surface 41 is also equipped with a clamping collar 42.The clamping collar 42 serves as a stop when the drain closure 1 with the clamping surface 41 is inserted into a drain pipe (not shown).

[0136] Figure 25 shows a bottom view of a drain closure 1. The drain closure 1 has a cover 5. Furthermore, the drain closure 1 has a first baffle 9 and a second baffle 10. The baffle volume 11 is formed between the first baffle 9 and the second baffle 10. The overflow section 25 is formed between the second baffle 10 and the cover 5. The first baffle 9 is connected to the second baffle 10 by means of three webs 18. The webs 18 are each formed radially to the first baffle 9 and the second baffle 10. The first baffle 9 has a first overflow edge 23. The second overflow edge 24 of the drain closure 1 has a diameter 32. The diameter 32 is 22 mm. The cover 5 of the drain closure 1 has a diameter 33. The diameter 33 is 7 cm. The first overflow edge 23 has an inner diameter of 34. The inner diameter 34 is 58 mm.The cover 5, the first overflow edge 23, the second overflow edge 24, as well as the clamping surface 41 and the clamping collar 52 are each rotationally symmetrical. The clamping collar 42 delimits the clamping surface 41. The clamping surface 41 is conically shaped.

[0137] Figure 26 shows a view of a drain closure 1. The drain closure 1 has a cover 5. The cover 5 has a diameter 33. The diameter 33 is 7 cm. The drain closure 1 has a first baffle 9. The first baffle 9 has a first overflow edge 23. The second baffle 10 is formed inside the first baffle 9. The second baffle 10 has a clamping surface 41 with a clamping collar 42. The clamping surface 41 and the clamping collar 42 are formed below the second baffle 10. The clamping surface 41 is conical and tapers towards the underside of the drain closure 1. The drain closure 1 has an inner diameter 34 of the first overflow edge 23. The inner diameter 34 is 58 mm.

[0138] Figure 27 shows a section through a drain closure 1 with a clamping surface 41. The drain closure 1 has a first retaining wall 9 and a second retaining wall 10. The retaining volume 11 is formed between the first retaining wall 9 and the second retaining wall 10. The first retaining wall 9 has a first overflow edge 23. The second retaining wall 10 has a second overflow edge 24. The drain closure 1 has a cover 5. The overflow section 25 is formed between the second overflow edge 24 and the cover 5. The second overflow edge 24 is spaced from the cover 5 by the distance 26. The distance 26 is 3 mm. The cover 5 has an outer diameter 33. The outer diameter 33 is 7 cm. The second overflow section 24 has an inner diameter 32. The inner diameter 32 is 22 mm. The first overflow edge 23 has an inner diameter 34. The inner diameter 34 is 58 mm.Water can be stored in the drain plug 1 above the storage height 19. The cover 5 is positively connected to the first storage wall 9 by clicking it into place.

[0139] Figure 28 shows a drain closure 1 with a clamping surface 41 in a drain insert 16. The drain closure 1 is designed analogously to the drain closure 1 from Figure 27. The drain closure 1 is inserted into the drain insert 16 with the clamping surface 41. A drain insert 16 is shown as an example in Figure 28. The drain insert 16 can be inserted into a drain pipe (not shown). It is also possible to insert the drain closure 1 directly into a drain pipe (not shown). This works essentially in the same way as inserting the drain closure 1 into the drain insert 16. The drain insert 16 has a contact surface 27 and a collar 22. The clamping surface 41 is completely surrounded by the inner wall 37 of the drain insert 16. The clamping collar 42 is positively connected to the collar 22.The drain closure 1 is inserted into the drain insert 16 with the clamping surface 41 until the clamping collar 42 stops against the collar 22 of the drain insert 16. The clamping surface 41 of the drain closure 1 is slightly compressed in the drain insert 16 by the inner wall 37 of the drain insert 16. As a result, the drain closure 1 is force-fittingly connected to the drain insert 16. This prevents the drain closure 1 from floating when it is surrounded by a liquid and there is at least some air in the storage volume 11. However, the force-fitting connection is designed in such a way that the drain closure 1 can be removed from the drain insert 16 by a user using muscle power. The clamping surface 41 therefore exerts a radial force on the inner wall 37 of the drain insert 16.

[0140] Figure 29 shows a view of a drain closure 1 in a drain insert 16. The drain closure 1 is designed like the drain closure 1 in Figure 23. The drain insert 16 has a contact surface 27. The contact surface 27 is ribbed. In addition, the drain insert 16 has a collar 22. The drain closure 1 is located in the drain insert 16. Figure 29 is therefore a view of a drain closure 1 in a drain insert 16, as shown in section in Figure 28.

[0141] Figure 30 shows a section through a drain closure 1 similar to Figure 27. Unlike in Figure 27, the diameter 33 of the cover 5 is larger. The diameter 33 of the cover 5 is 8 cm here. A larger diameter 33 of the cover 5 prevents a user from looking into a drainpipe (not shown) when the drain closure 1 is attached to the drainpipe. This results in an aesthetically pleasing overall appearance.

[0142] Figure 31 shows a section through a drain closure 1 with a clamping surface 41 and a clamping collar 42 as well as a drain insert 16 similar to Figure 28. Unlike in Figure 28, the diameter 33 of the cover 5 is enlarged. In Figure 31, the diameter 33 is 8 cm. This prevents a user from looking into the drain insert 16 when the drain closure 1 is on the drain insert 16. Figure 32 shows a view of a drain closure 1 with a drain insert 16 similar to Figure 29. Unlike in Figure 29, the diameter 33 of the cover 5 is enlarged and is 8 cm.

Claims

Patent claims 1. Drain closure (1) for damming or draining a medium (2) from a liquid reservoir (3) into a drain pipe (4), comprising a cover (5), a first dam wall (9) and a second dam wall (10), wherein the first dam wall (9) is connected to the cover (5) in an airtight manner and a first dam volume (11) is arranged between the first dam wall (9) and the second dam wall (10), wherein the second dam wall (10) can be connected to the drain pipe (4) in a sealing manner.

2. Drain closure (1) according to claim 1, characterized in that the cover (5) is convex.

3. Drain closure (1) according to one of the preceding claims, characterized in that the cover (5) is formed in one piece with the first retaining wall (9).

4. Drain closure (1) according to one of the preceding claims, characterized in that a distance (26) between the second retaining wall (10) and the cover (5) is max. 5 mm, in particular max. 4 mm, further in particular max. 2 mm.

5. Drain closure (1) according to one of the preceding claims, characterized in that the second retaining wall (10) and the cover (5) are connected to a connecting element (13), wherein in particular the connecting element (13) has a support surface (14) which can be placed on a support (15) of a drain pipe (4), in particular a drain insert (16).

6. Drain closure (1) according to claim 5, characterized in that the connecting element (13) comprises a lifting device (17) by means of which the second retaining wall (10) can be brought from a retaining position, in which the second retaining wall (10) is sealingly connected to the drain pipe (4), into a draining position in which the second retaining wall (10) is not connected to the drain pipe.

7. Drain closure (1) according to one of claims 5 to 6, characterized in that a maximum of 3 webs (18) are arranged between the second retaining wall (10) and the cover (5) or between the second retaining wall (10) and the connecting element (13).

8. Drain closure (1) according to one of the preceding claims, characterized in that the cover (5), the first retaining wall (9) and the second retaining wall (10) are made of plastic and / or brass and / or chrome steel.

9. Drain closure (1) according to one of the preceding claims, characterized in that the first storage volume (11) is annular.

10. Drain closure (1) according to one of the preceding claims, characterized in that no webs (18) are formed between the second retaining wall (10) and the cover (5).

11. Drain closure (1) according to one of the preceding claims, characterized in that the second retaining wall (10) has a height of max. 3 cm, in particular max. 2 cm, further in particular max. 1.2 cm 12. Drainage system (28) for damming or draining a medium (2) from a liquid reservoir (3) comprising a drain closure (1) according to one of the preceding claims and a drain siphon (20), wherein the drain siphon (20) is arranged downstream of the drain closure (1).

13. Drainage system (28) according to claim 12, characterized in that the drain pipe (4) comprises a drain insert (16), wherein the drain insert (16) can be inserted into the drain pipe (4) at the liquid reservoir (3) and forms a support (15) for the drain closure (1).

14. Drain system (28) according to one of the preceding claims 12 to 13, characterized in that the drain insert (16) can be screwed into the drain pipe (4).

15. Drain system (28) according to one of the preceding claims 12 to 14, characterized in that the drain insert (28) has a collar (22).

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