EP2049219A2

EP2049219A2 - Tank

Info

Publication number: EP2049219A2
Application number: EP07818020A
Authority: EP
Inventors: Kurt Wallerstorfer; Andreas Wawrla; Roland Scholz
Original assignee: Aquis Wasser Luft Systeme GmbH Lindau Zweigniederlassung Rebstein
Current assignee: Aquis Wasser Luft Systeme GmbH Lindau Zweigniederlassung Rebstein
Priority date: 2006-08-10
Filing date: 2007-08-10
Publication date: 2009-04-22
Also published as: PL2049220T3; DE102007038027B4; CN101534918B; DE102007038028A1; KR20090057377A; DE102007038025A1; KR20160006254A; WO2008017508A2; JP2010500162A; WO2008017509A2; WO2008017492A2; CN101563141A; RU2009108267A; EP2049220A2; EP2433906B1; CN101594922A; EP2063972B1; US20090266757A1; US8252180B2; DE102007038027A1

Abstract

A tank (66) for aquiferous devices, particularly household appliances, or devices for the processing of food and/or beverages, such as beverage dispensers, particularly coffee dispensers, drinking water dispensers, cooking and baking devices, steam dispensing devices, particularly steam irons, steam cleaners, high-pressure cleaners, air pressure cleaners and conditioners, or such, is provided, wherein a suction connector (67) is provided at the tank (66) for the suctioning of the water from the tank using means for generating low pressure, and a filter connector (1) is provided for the connection of a filter cartridge (31), in the interior of the tank while ensuring that only the permitted filter type can be used. A tank according to the invention is characterized by mechanical coding structures (87-96, 98, 99) at the filter connector element (1) in order to exclude the use of any filter cartridge not corresponding with the tank (66).

Description

"Tank"

The invention relates to a tank with filter cartridge according to the preamble of claim 1.

In various machines, for example in coffee or espresso machines, a water tank is provided for storing a liquid, in the case of coffee or espresso machines for storing water, wherein a filter cartridge is inserted into the tank to the water before processing in the machine prepare. Known filter cartridges have at the bottom of an inlet through which the water is sucked in by the associated machine. Here, the water is passed through a filter bed and passes through a connection of the filter cartridge to a corresponding suction port of the water tank in the machine.

For a reliable operation of the machine, it is of great importance that a filter cartridge defined in its filter parameters is used. Due to a defective filter cartridge, the machine is supplied with insufficient or incorrectly treated water, which can lead to negative effects, for example calcification or the like, right through to machine defects. The machine control system will not be able to initiate scheduled service intervals in a timely manner if it starts from a filter cartridge of the correct type, but these actually not used. The use of insufficient filter cartridges causes problems not only in the operational safety of the machine, but also in questions of warranty etc. It is therefore of great importance to ensure that only approved filter cartridges are used at all times.

The invention therefore has the task of proposing a tank and a filter cartridge, by means of which it is ensured that only the approved type of filter is used.

Accordingly, a tank according to the invention with a suction connection element for suctioning water by means of negative pressure from the tank and a filter connection for connecting a filter cartridge inside and / or outside the tank is characterized in that the filter connection of the tank with at least one, at least one axial projection and / / or at least one mechanical coding structure comprising an axial recess is provided which matches a complementary coding structure of the filter cartridge, correspondingly comprising at least one recess and / or at least one projection.

Under such a tank-side filter exclusion element are according to the invention directly and / or indirectly arranged on the tank and / or trained elements to understand how protruding and / or recessed receiving and / or fixing and / or coding and / or sealing elements. These may e.g. as firmly connected to the tank or connectable formed Ausschlussstutzen, be designed as hooks, eyes, adapters or the like.

The tank-side filter connection is in this case preferably formed in the bottom region of the tank. But it can also be at least partially or completely in a corner and / or on a side wall of the tank inside and / or outside be arranged, depending on where the connection between the water tank and a device-side drain line is provided. For example, a tank-side filter connection element which is led out of the tank at a distance from the bottom of the tank in its operational installation position is also conceivable.

By such embodiments, e.g. a can and / or drawer-like tank can be realized, in which in turn only one provided with a corresponding coded filter-side tank connection element filter cartridge can be used. The device-side connection of the tank connection can be connected both in this and in the embodiments described above as a plug connection to a correspondingly complementary device-side tank connection element. The tank-side filter connection element which is at a distance from the tank bottom can, for example, also be designed as a filter connection element which can be suspended on a tank wall, e.g. in the form of a pipeline which, with the cartridge inserted, has the appropriate matching code for discharging the raw water filled into the tank and filtered through the filter cartridge.

In accordance with low-lying arrangement of

Water inlet openings for the filter section can be emptied with such an embodiment of the essential content of the tank, so that it has no or only a small amount of not feasible through the filter section dead water.

The structures at the filter connection of the tank must thus interact with corresponding connection structures of a filter cartridge according to a key-lock principle so that the filter cartridge can be inserted into the water tank in a functional manner. In this way, a machine or tank manufacturer can ensure that only filter cartridges are used -A-

that ensure reliable operation of a dedicated machine. The vacuum for suction can be generated for example via a suction pump.

In addition to such axial projections and / or recesses encryption elements can also be provided in the radial direction of the filter connection element or the filter cartridge.

In a particularly advantageous embodiment of the invention, the filter connection of the tank and a connecting piece of the filter cartridge are formed so that they at least partially enclose each other. In particular, in such an embodiment, for example, to supplement axially aligned coding structures, e.g. for further differentiation of the encryption structure, as for different applications and / or customers also in the radial direction, d. H. be arranged transversely with respect to the axis of the connecting piece of the filter cartridge used. These can readily be combined with a wide variety of axial coding structures, for example on the end face of the connecting piece or in the region of the tank bottom.

Preferably, the coding structures are at least partially formed at the same time as fixing elements for fastening the filter cartridge. In this case, the coding structures are preferably performed undercutting, so that for example by rotation or by clipping a fixation of the filter cartridge on the tank bottom or a mounted on the tank bottom fastener can take place, of course, the corresponding coding structures must match to proper operation with the correct filter cartridge sure. In a particularly simple embodiment, the coding structures can also be formed as a bayonet closure. For this purpose, projections extending transversely to the axis of the filter connection element are preferably provided on the filter connection of the tank and / or on the tank connection of the filter cartridge, which correspond to receiving and / or guideways corresponding to the tank connection of the filter cartridge and / or to the filter connection of the tank.

It is, however, also possible to form double bayonets or multiple bayonets, wherein this double or multiple structure can relate both in plan view to the peripheral surface of a corresponding connection element, as well as on the longitudinal extent thereof. Based on the plan view of the circumferential surface, in this case also differently spaced angular arrangements between individual and or more double or multiple bayonet elements can be realized. As a result, according to the respective formed, complementary bayonet elements an encryption for differently constructed bayonet structures can be achieved, wherein in each case a first or second or even a further level bayonet connection can be completely provided or no passage for a not properly coded filter cartridge provided bayonet element , so that a proper insertion of this cartridge is prevented.

Due to the spatial arrangement of projections and Aufnahmebzw. Guide contours, in particular in a combination of axial and radial elements, for example, a reliable mechanical coding for a whole family of cartridges can basically be created, for example, only individual structural elements of the coding one or possibly several correct filter cartridges thereof make it functional or prevent it from happening. Different arrangements and shapes, for example, but can also be provided for coding different types of filters for different machines.

Radially protruding, e.g. In addition, wing-like projections on the cartridge can provide the additional benefit of wider guidance. Moreover, with such an embodiment, easier insertion into corresponding guideways in the tank socket is possible because the protrusions or wings of the cartridge are readily visible upon insertion by an operator and thus allow at least rough co-positioning or filter alignment when used. Moreover, as a result of these radial projections, an enlargement of the circumference of the cartridge results in the region of the fastening, so that the stability of the anchoring is improved.

Moreover, such protrusions or wings on the filter cartridge can be made of more elastic material in comparison with the material of the tank base, so that a better clamping of the filter cartridge in the axial direction can be accomplished via a spring-like action.

Basically, the embodiment is advantageous as a bayonet closure in conjunction with an axial seal, which is pressed in the axial direction against a tank-side density. The bayonet lock provides a corresponding torque in the axial direction, while the axial seal offers corresponding advantages when inserting. For example, no frictional forces have to be overcome to press and release an axial seal when inserting and removing a filter cartridge.

The above-mentioned features of a bayonet closure with radially projecting projections or wings on the Filter cartridge offer the advantages mentioned in particular in connection with an axial seal. The corresponding projections and guideways of the bayonet closure can still serve as a complementary coding structure.

In principle, coding structures can also be used as actuators in the area of the tank connection. For example, a switching mechanism mounted on the tank can be operated with the coding structures of the filter cartridge, which can be used to signal the correct fit of the filter cartridge and / or to detect the correct type of cartridge by the associated device. Such an embodiment of the coding elements as an actuator is basically possible in all other types of coding structures.

Further differentiation of the coding structure may e.g. be realized by a combination with different shapes of the scope of the tank-side filter connection. Thus, an additional coding can be made for example by a deviation from the previous circular cross-sectional shapes of corresponding connection elements. For example, it can be ensured by an oval shape of the tank-side filter connection that even with otherwise suitable for the use of the filter cartridge axial and possibly also radial coding structures only a correspondingly suitable filter cartridge is used.

In a development of this embodiment, the filter connection of the tank can also be provided with a circumferential contour in the form of a polygonal line. Such a shaping also allows, with appropriate structuring of the axial, and if used also radial coding structures a more extensive angular coding for different insertion angle positions of the filter cartridge. Preferably, a rotationally symmetrical circumferential contour is provided on the filter connection element for this purpose. With the aid of a rotationally symmetrical configuration, different, predetermined angular positions can be realized when a filter cartridge is inserted, to which an additional function depending on the angular position can be assigned if required. An example of a peripheral shape of the tank-side filter connection element according to the embodiments described above would be given for example with a hexagonal cross-sectional contour. Such a contour can be z. B. to six different angular positions of a corresponding filter cartridge. The same applies to square, hexagonal, 8-edged or similar structures.

The tank-side filter connection element can be designed as a recess with a corresponding inner circumference and / or outer circumference or as a projection with a corresponding outer circumference and / or inner circumference. Accordingly, a connecting piece can be provided with the corresponding circumferential contour both for insertion and for attaching a corresponding connecting element of the filter cartridge either on the inner circumference and / or on the outer circumference.

Advantageously, the thus formed peripheral surface is also formed as a sealing surface. The seal can thus be made in an advantageous manner from the same material as the cartridge housing, preferably molded. In this way, it is ensured that only one filter cartridge with a corresponding shape of the seal for the filter outlet line can be inserted into the tank in a functional manner and connected to the tank-side filter connection element. A peripheral surface which is shaped as described above can also be used as a holder for the filter cartridge, which corresponds to a correspondingly shaped holding element in the tank area. Also in this case, a coding structure is realized by the peripheral surface.

The coding structure can, especially if it also forms the sealing surface, an axially extending cross-sectional taper, e.g. have the nature of a conical or truncated pyramid. As a result, a lighter, tight plugging without greater frictional forces is possible.

On the side of the filter cartridge, as already mentioned several times, provide the corresponding coding structures, which correspond to the tank-side coding structures. If the sealing surface of the tank-side filter connection enclosed in the shape of the coding structures, so in a particular embodiment, the seal itself is provided as a filter-side tank connection element with the appropriate shape. For example, in the case of a hexagonal cross-section of the tank-side filter connection element, there is the possibility of providing a correspondingly hexagonal seal as a counterpart. This can be carried out as an axial seal and / or as a radial seal, which is either inserted into a correspondingly shaped, in the above embodiment hexagonal recess or plugged onto a similarly shaped projection. In the case of a cross-sectional tapering as mentioned above, the seal is preferably adapted accordingly, so that it conforms to a planar projection, for example, as a projection designed as a hexagonal truncated pyramid.

In this embodiment, only a filter cartridge with appropriately shaped seal is operationally usable.

In a particular embodiment, projecting from the bottom of the tank, acting on the outer circumference of the filter cartridge fixing means are provided which may additionally have a coding property. An example of a fixation is the latching or clipping of the filter cartridge in corresponding latching or Klipselementen, which may optionally also be designed as Kodierstruktur.

Advantageously, moreover, a blend setting can be provided, with which a bypass flow of unfiltered or otherwise treated water is guided past the filter bed, wherein the amount of unfiltered or otherwise treated water is made adjustable. This is possible, for example, with one or more bypass openings, which are opened to adjust the amount of water passed by the filter bed variably adjustable. Such a blend adjustment can be realized for example via the angular position of the mounting position of the filter cartridge. In this case, the combination of the coding structure with the specification of fixed angular positions via the mounting position is particularly advantageous. For the axial coding structures, the corresponding statements above also apply here. The blended amount of unfiltered or otherwise treated water can be realized by appropriately trained openings that connect the tank interior directly to the drain of the tank. Depending on the installation angle of the filter cartridge, these openings can be of different sizes or opened and / or opened in different numbers, so that a different mixture ratio results depending on the installation position of the filter cartridge.

Thus, for example, in the case of a hexagonal-shaped coding structure in the connection region of the filter cartridge in the tank-side connecting piece, which is provided for connection to the filter cartridge, openings of different sizes can be provided as a bypass, which are closed depending on the angle when a filter cartridge is inserted. The bypass openings are preferably mounted in the sealing surface, so that all openings are sealed by a correspondingly shaped connection seal of the filter cartridge when inserting the filter cartridge, except for the opening provided as a bypass opening.

The amount of waste can also be adjusted in other ways using the coding structure. Thus, for example, a coding structure at the same time serve as a mechanical driver to mechanically actuate an adjustment in the tank area through the filter cartridge. In the case of a hexagonal connection socket in the tank region, for example, a corresponding hexagonal contour of the filter cartridge could serve to rotate a rotatable base element for the purpose of adjusting the amount of waste mixture. The hexagon-shaped coding structure of the filter cartridge then would not only have a coding function, but at the same time would be a mechanical actuating element, somewhat like a hexagonal wrench. Another possibility for coding the tank filter connection consists in changing the orientation of the longitudinal axis extending through the filter-side tank connection element with respect to a longitudinal axis passing through the filter housing, so that they form a particular, in particular acute, angle, for example. For this purpose, the filter-side tank connection element may be formed slightly bent relative to the cartridge housing. Cartridges that have no aligned in their position so bent connection element can not be used properly in a correspondingly tight water tank. Another advantage of such a coding is that even curved and / or curved water tanks with comparatively large longitudinal extent can be reliably and reliably equipped, since the bending of the two longitudinal axes relative to one another results in a correspondingly reliable sealing and fixing tank filter receptacle optimal alignment of the tank-side filter connection element in the tank and deviating from a vertical insertion movement insertion movement for the angle cartridge can be realized.

If appropriate, further guide elements for the reliable connection of the tank-side filter connection element to the filter-side tank connection element can be provided on the filter cartridge and / or on the tank for this purpose. In particular, this is well suited for this purpose, for example, in the insertion direction provided in the insertion a tapered cross-section forming ribs through which the filter-side connection element and / or the filter housing and / or a filter housing projecting guide structure, such as a connecting ring or the like, lead during insertion of the filter cartridge. Such a filter-side guide structure may be formed as a ümfangsfläche, it may also be slit-shaped, complementary to the above Having described ribs formed contours and / or another suitable structure.

In the case of a rib-slot coding, a further coding possibility is possible in turn by different angle encodings, viewed in plan view, for one or more such complementary elements. Only if the slot-rib combination and the angled tank filter connection structure match a corresponding filter cartridge can be used according to the operation.

However, this guide and coding structure described here can also be used for non-angled filter connection elements with the same mode of action.

An additional guiding and / or coding function can be realized by protruding tips or recesses formed on the filter cartridge on the front side, which can engage in correspondingly complementarily shaped, tank-side coding and / or guiding structures.

In order to ensure that, in order to circumvent the coding according to the invention, the tank of a machine is exchanged for an unauthorized tank without coding structures for the use of unauthorized filter cartridges, it is also advisable to provide the interface between tank and machine with coding structures which correspond to one of those described above Same embodiments. Here, the machine-side and the tank-side connection elements are to be coded accordingly. Embodiments are also covered by the invention which implement the connection of the filter cartridge via separate adapter parts that can be connected to the filter cartridge or the tank. The same applies to the connection between the tank and the associated device.

The invention can be used advantageously in all water-conducting devices, in particular in water-bearing domestic appliances or devices for the preparation of food and / or drinks, such as vending machines, in particular coffee machines, drinking water dispensers, cooking and baking equipment, steam and / or high pressure cleaners, air purifiers and - conditioners or The like having a corresponding water tank.

Various embodiments of the invention are illustrated in the drawings and will be explained in more detail with reference to the figures below.

Show in detail

1 is a side view of a bottom section of a water tank with inserted filter cartridge,

2 is a plan view of a bottom section of a water tank according to Figure 1,

3 is a plan view of the tank connection element of a filter cartridge according to Figure 1,

4 is a perspective view of a filter cartridge according to Figure 1,

Fig. 5 shows a variant with angle-dependent waste quantity adjustment,

6 shows by way of example and schematically a filter-side and a device-side tank connection, in each case in combination with a correspondingly formed adapter piece and the

Fig. 7-62 show further possible embodiments in different views by way of example and schematically.

FIG. 1 shows connection elements 1, 2 of a fragmentary tank 66 shown in phantom by dashed lines and an associated filter cartridge 31. On the tank side, a connection socket 1 is fixedly connected, for example welded, glued or otherwise, to the bottom 29 of the associated tank 66 is attached. In this connection socket 1, the tank connection element 2 of the filter cartridge 31 is inserted. The filter-side tank connection element 2 can be seen better in FIG. 4 and comprises a connecting piece 4, which merges into the cartridge housing 36. In the embodiment according to FIGS. 1 and 4, the water passes via lateral slots 6 and subsequently through cartridge openings on the inside of the cartridge housing 36 and then passes through a filter bed (not further shown). The filter section can be formed in upflow, in downflow or in combination with both flow guides. Through the central outflow pipe 35, the filtered water finally reaches the suction connection 67 water tanks 66 via the tank-side device connection 68.

Essential details of the invention will now be explained in more detail below with reference to FIGS. 1 and 2. Of the tank-side filter port 1 has to ensure that only correctly provided for the particular application filter cartridges 31 can be inserted into the water tank 66 with respect to a running through the tank filter port longitudinal axis 69 axially aligned coding structures. These coding structures can be formed both as axially aligned projections, as you are here exemplified by protrusions 87 to 95 and 99, in particular in Figure 2 clearly visible. But they can also be formed in the form of axial recesses, as they are also exemplified and not exhaustive as recesses corresponding to the positions 96 to 98 shown.

These axially aligned coding structures of the tank-side filter port 1 and a correspondingly coded filter-side tank port 2 are intended to preclude manipulation due to filter cartridges not intended for use by the manufacturer. By correspondingly complementary coding structures of projections and recesses on the tank and filter-side connections 1 and 2, it can be ensured that filter cartridges provided only for the respective application can be used in a functional manner in the water tank, if appropriate also using a corresponding intermediate piece, e.g. in the form of an adapter, which in turn must then have the correspondingly complementary coding structure, so that the required

Key / lock combination can lead to a properly inserted into the tank filter cartridge.

The exemplified axial projections 87 to 95 and 99 are used to ensure that only a filter-side tank port of a filter cartridge according to the hexagonal shape shown here in Figures 1 to 6 sealingly connected to the tank side, hexagonal filter port 1 can be. Another possibility for sealing in particular without a sealing element with complementary, axially oriented coding structures mapped thereto is thus not possible. Here in this example, the sealing takes place at the sealing surface 24 formed on the tank-side connection base 23 in cooperation with the filter-side sealing surface 33, which in turn is formed on the filter-side tank connection in the form of the molded seal 32. The axial recess 96 between the tank-side terminal base 23 and these axially at least partially surrounding axial projections 87 is formed so narrow that only a coding element in the form of a hexagonal, axial projection, as realized by the molded seal 32, in sealing and preferably also can be used in a fixing manner.

In order to prevent a filter-side tank connection which does not use this axial recess 96 from being able to be attached at the top in a sealing manner to the tank-side filter connection 1, e.g. on the front-side upper edge of the terminal base 23 frontally projecting, axial projections 90, 91 are formed. These prevent a sealing applying a seal without axially formed Kodierstrukturen, here in the form of axial recesses, or optionally axial projections, depending on how the ratio between the remaining surface of the front edge 71 and the axial projections 90 and 91 is selected. Instead of the training according to axial projections 90, 91 may be provided in a modified embodiment, an axial recess in the function, so that again no sealing contact without a complementary axial projection is possible. However, their representation has been omitted here for reasons of clarity.

In order to ensure even within the tank-side connection socket 23 that only seals with axially aligned Structures for sealing between the tank-side filter connection and a corresponding filter-side tank connection can be realized so-called inner ribs 30 are formed, which extend up to or possibly even over the edge of the example here centrally arranged Tankauslassöffnung 67, as exemplified schematically in the extension of the positional mark 91.

In order to be able to prevent a seal against the filter-side tank connection also outside the axial recess 96 provided for receiving the filter-side connecting piece 32 in the form of the molded seal 32, further axial projections and recesses are again shown here, again by way of example and schematically. In addition, they can also have, in a particularly advantageous manner, fixing elements for the filter cartridge to be used or be designed as such. Again purely by way of example, axial projections 37 formed on the filter cartridge housing 36 and axial recesses 38 formed complementary thereto on the tank-side filter receptacle are described. By radially in the contact area of this connection structure radially greater extent than comparatively in the outer, based on the tank-side terminal base end contact area, these two elements may also constitute fixing that slip into each other when overcoming a certain contact force when inserting the cartridge in the tank connection with a so-called snap effect the two end faces 39 and 40 abut each other and the filter cartridge is fixed.

Another possible, axially aligned coding structure is again shown schematically and by way of example with reference to the protrusion-recess connection 98, 99 shown adjacent thereto. This is on the inside of the Outer shell 25, which is also characterized as an axial projection 92, another axial projection 99 is shown, which requires the presence of a correspondingly complementary axial recess 98 on the filter cartridge 31 to allow the insertion of a corresponding cartridge.

The six outer shell elements 25, which are likewise exemplified here, themselves represent axial projections 92, the outside of which, in turn, have additional axial projections 93 in order to prevent sealing engagement.

On the bottom side, in the direction of the tank bottom 29, these axial projections also extend in the radial direction and are additionally identified with the position number 95. In spite of this radial expansion, however, these are also axial coding structures, which in turn reliably prevent the application of a seal without axially coded structures. In a particularly preferred embodiment, such, for example, referred to as a bottom rib, axial projection structure may be formed at least on one side of the tank to the wall to reliably prevent a bottom-side connection seal without axially aligned coding structure.

As already partially referred to above, one or more of the elements represented here as axial projections, in particular the bottom ribs 27 and 95, may also be designed as axial recesses in a complementary structure, so that in turn a seal without an axial coding structure can be prevented.

A tank-side device connection 68 is shown here for the sake of simplicity only as an example round-shaped connection piece. Again Terminal socket 1 of the tank-side filter port but can also tank side device port 68th

Having coding structures to ensure that only allowable connection connections can be made, so both with a filter cartridge to be used for the tank and, if desired, with a suitable for the use of this tank device. For the sake of clarity, a graphical representation of such details for the device connection 68 is omitted and with regard to the embodiments of codings possible for this purpose, reference is made to the embodiments described with regard to the tank filter connection, which are also valid in their entirety for the tank device connection.

A further and / or additionally possible embodiment of a tank-side filter cartridge coding is shown in FIGS. 2 and 5 as a tank-side filter connection element, the peripheral surface 33 of which has a coding structure with a polygonal cross-section aligned axially with respect to the filter connection stub 2. In this particular embodiment, the polygon is representative of a variety of other possible embodiments of tank filter ports as a hexagon.

Further details on such a possible coding between a tank-side filter connection element 1 and a filter-side tank connection element 2 will be described below again with reference to FIG. The example designed here as a hexagon, tank-side filter connection element 23, in the form of a connection socket 23 is formed to realize its polygonal contour as an axial projection 23 with a polygonal outer circumference 24 and a corresponding polygonal inner circumference. The complementary cartridge connection structure lies behind Attaching the filter cartridge preferably positively and sealingly in a first possible attachment form with its inner circumference 33 on the outer circumference 24, the filter cartridge 31 fixing and sealingly.

In a preferred manner, the tank-side filter connection socket 23 and the connecting piece 4 of the filter cartridge can at least partially surround themselves in this case. In the case of complete enclosure, in addition to the additional stabilizing effect of the circumferential contact surfaces between these two axially structured elements, a perfect, large-area seal between the fresh water side in the interior of the tank 66 and the side of the filter device for device supply via the suction connection 67 located at the connection opening 35 is ensured.

In a complementary embodiment according to FIG. 6, by reversing this structure, the tank-side filter connection element 23 can be designed as a complementary structure in the form of an axial recess with a corresponding inner circumference, on which in turn the sealing surface 33 of the filter cartridge can preferably bear in a positive and planar sealing manner This in turn at the same time a sufficient fixation of the filter cartridge 31 is ensured on the tank 66.

Referring again to Figure 2, further details for encoding the tank filter port for the embodiment formed as an axial projection 23 will now be described. Analogously, however, these statements also apply to a filter connection in the form of the above-described axial recess 23 according to FIG. 6. On account of this relationship, the same reference symbols are used for the respective mutatis mutandis, the same features for both embodiments. The tank-side connection base 23 (FIG. 2) has a hexagon-shaped outer contour whose peripheral outer surface forms a sealing surface 24. Outside the base 23 are in the direction of a filter cartridge to be used

31 facing, approximately parallel to a longitudinal axis 69 extending through the terminal aligned outer shells 25, which are adapted to at least partially enclose a filter cartridge housing or its connection area from the outside.

In the space 70 between the terminal base 23 and the outer shells 25 locking elements 26 are attached, which ensure that only a narrow, matching the sealing surface 24 seal can be inserted into the region of the terminal socket 23.

Bottom ribs 27, 28 prevent, as already described in part, a seal against the tank bottom 29, as well as inner ribs 30 prevent sealing by means of an inner radial seal. The bottom ribs are preferably arranged radially and / or tangentially with respect to the connecting piece 23 aligned near the bottom. The inner ribs 30 project inwardly and / or upwardly beyond an upper edge 71 of the terminal socket 23. Through these structures, only the sealing surface 24 is accessible as a sealing surface, so that a coding structure according to the invention is present through the hexagonal outer contour of the sealing surface 24 shown here by way of example.

The inserted filter cartridge 31 is provided with a molded seal

32 provided, which accordingly also has a hexagonal cross-section (see Figure 3). The inner surface of the molded seal 32 forms the sealing surface 33. In addition, the inlet slits 34 for supplying water into the filter cartridge as well as a central outflow opening 35 for the drainage of water can be seen in FIG.

About the molded seal 32 with a correspondingly shaped terminal socket 23, the illustrated embodiment comprises further coding structures. Thus, on the outside of the filter cartridge housing 36 snap elements 37 (compare FIG. The snap elements 37 can be inserted into corresponding receptacles 38 of the outer shells 25. When placing the ünterkante 39 on the stop 40 of the receptacles 38 results in a pressure point. Up to this position, the filter cartridge 31 can easily sit in the correct angular position without resistance. In this angular position, the molded seal 32 is aligned with respect to the sealing surface 24 of the connection socket 23, so that it can be further inserted in the axial direction. By further impressions in the axial direction, the snap element 37 snaps over the stop 40, wherein the molded seal 32 is pressed along the sealing surface 24. Due to the bevel of the snap elements 37 and the corresponding inner shape of the outer shells 25, the filter cartridge 31 is fixed in the outer shells 25. Further axial fixing elements are no longer required in this embodiment.

Fig. 5 shows a schematically illustrated embodiment with angle-dependent adjustable amount of waste. The tank bottom 52 is only partially shown in the connection area of the filter cartridge 53. The tank bottom 52 comprises a hexagonal connection base 54, which slightly converges towards the top in order to improve the sealing effect in relation to a purely vertical alignment of the base walls and / or as a further coding structure in the manner of a truncated pyramid. This cross-sectional taper is barely visible in the perspective view. The outer surfaces 55 of the terminal socket also serve as a sealing surface to seal the drain line 56 with the filter cartridge 53 mounted completely or partially with respect to the interior of the tank.

The filter cartridge 53 has a socket-shaped seal 57 corresponding to the connection socket 54. The individual walls 58 are the same length except for a wall 59 in the axial direction A. The wall 59 is provided with a lower-side recess 60, whose function will be explained in more detail below. Inside the seal 57, the outlet 61 can be seen from the filter cartridge 53 through which the filtered water enters the drainage line 56.

Various base walls 62, 63, 64 of the terminal socket 54 are provided with a different number of bypass holes 65. The bypass openings 65 are arranged so that they are sealed by the longer sealing walls 58 when attaching the filter cartridge 53. Only where the wall 59 with recess 60 is used can the bypass openings 65 remain open, so that water filtered via the recess 60 directly from the tank to the region of the discharge line 56.

As can be readily appreciated from the illustrated embodiment, the angular arrangement of the filter cartridge, i. with the selection of the base wall 62, 63, 64, to which the recess 60 is attached, the size of the free cross section of the bypass openings 65 set.

In the present embodiment, the cross-sectional openings of the multipassed bypass ports 65 add up. In other embodiments, different sized bypass ports 65 may also be provided become. Due to the different cross sections of individual bypass openings 65 or in the sum of several bypass openings 65 on a base wall, for example, the base wall 64, different proportions of unfiltered water, the filtered water are added. This results in a blend setting, which is dependent on the angular position of the filter cartridge 53.

In addition to the illustrated embodiments, further embodiments or combinations of these embodiments are readily conceivable. Thus, for example, the previously described coding structures in the form of exemplified, hexagonal polygons by other coding structures, again exemplified z. B. in the form of square polygons and / or combined, as shown for example by an embodiment of Figure 6 additionally exemplified.

Finally, FIG. 6 shows, in addition to a base filter connection in the form of an axial projection 23 on the tank-side filter connection element 23 compared to the embodiments in FIGS. 1 to 4, a complementary shape as an axial recess 23 formed in the bottom 29 of the tank The coding options described in the first embodiment can also be realized here, either the same and / or complementary or even in combined embodiments.

FIG. 6 shows the possibility of using adapters 85, 86. The adapter 85 is shown purely by way of example for connecting a filter cartridge 73, also shown by way of example, to a tank-side filter connection 1, wherein the embodiment of the filter connection 1, in particular its base 23 as already stated above, both as axial protruding base can be realized as well as axially recessed trained groove. The same applies mutatis mutandis to the tank-side device connection on the bottom of the tank bottom 29. Due to the same functionalities the same elements are also provided with the same numbering, as used in part already above in the description.

The illustrated embodiments show the most diverse coding structures that are to be provided according to the invention. In any case, it is ensured that only suitably adapted filter cartridges with key function fit into the corresponding tank-side filter connections.

Hereinafter, further possible embodiments with reference to Figures 1 to 26 will be described. FIGS. 7 to 14 describe a tank filter cartridge connection with encryption or coding structures axially aligned with respect to a longitudinal axis of the connection in combination with a further embodiment of a form-locking seal. For the sake of simplicity, corresponding features with the same basic numbering, but increased by the number 100, are already designated for the previously described embodiments.

Accordingly, FIG. 7 shows a tank-side connecting piece 104 in which a filter cartridge 131 is connected via a filter-side tank connecting piece 101. According to FIG. 8, the housing 136 of the filter cartridge 131 is completely inserted in the tank-side connection stub 101. The front-side end of the cartridge housing 136 is shown in FIG. 8 behind a passage slot 106 for the inflow of fresh water in the tank into the interior of the connection stub 101. Centrally in this visible portion of the filter cartridge housing 136, a recess 160 is shown in the form of a bore, which Function of a waste element is held, and fresh water can flow through it and through another, arranged behind it, not visible here opening into the Filterauslassbereich 135, in which the filtered from the cartridge water into the tank outlet 168 is passed.

As one of several possible fixation of the filter cartridge 131 on the tank-side connecting piece 101, a receiving guide track 115 for receiving a radial projection 116 formed on the filter cartridge is illustrated thereon. Both have a catch element 117 and 118, each complementary to the other, which snap into each other after a corresponding rotational movement upon insertion of the filter-side tank connection element 102 after overcoming corresponding clamping forces of the part projecting like a wing from the tank-side connection piece. Characterized in that the locking element 117 has a thickening in its front region, based on a required for the use of the filter cartridge rotational movement, which faces a correspondingly large recessed area in the locking element 118, thus a position-locking locking of the two connection elements can be ensured.

FIG. 9 shows the filter-side tank connection region in the filter cartridge 131, wherein the housing 136 in the front, front-side region has a protrusion 136.1 projecting opposite recesses 136.2, in each case comprising the throughflow opening 160 already described above as a waste element. The projections 136.1 of the filter cartridge housing 136 in turn represent axially aligned coding structures, which is a proper use of the filter cartridge in the relevant

Tank connection element allow. Once one of these axial coding or encryption elements in the form of Housing projections 136.1 is missing, fresh water in the tank flows directly through the correspondingly large cross-section having passage opening 106 and the underlying, also having a correspondingly large cross-section further bypass opening 165 directly into the device intake region 168th

An optionally used filter cartridge without corresponding axially protruding housing wings 136.1 would be in this case due to the large flow of fresh water into the inlet region of the device connection without filtering effect, as can be clearly seen from Figure 10.

The embodiment described here in each case has three axially aligned coding structures 136.1 on the filter housing 136, which are preferably offset by 120 ° at the front end on the circumference of the filter-side

Tank connection element 102 are arranged, as shown in FIG 9 well removed. The complementary connection elements of the tank-side filter connection 101 is shown in FIG. 10.

FIGS. 11 and 12 show two further views of this embodiment of a tank filter connection 101, 102. At the tank-side filter connection 101, three axial recesses 101.1 are shown, which are recessed in the tank bottom 129 and receive the three complementary housing protrusions 136.1 of the filter cartridge can. Thus, axial projections 136.1 or complementary axial recesses 101.1 are again shown here as an encryption or coding structure for preventing filter cartridges not intended for the intended purpose.

FIG. 13 shows a section through a tank-side filter connection element 101 in which a filter-side tank connection element 102 is inserted. At the bottom, bottom-side area of the tank side

Filter connection element 101 are in this case the substantially closed by the three housing projections 136.1 bypass or short-circuit openings 165 to recognize. When the filter cartridge is inserted, the bypass function is realized so that a certain amount of fresh water is added to the filter water filtered by the filter cartridge and exiting through the outlet 135. If the cartridge is missing, this axial coding structure is ineffective or this tank-side filter connection can only be used for unfiltered passage of the fresh water in the tank.

When inserted cartridge can penetrate through the recesses 136.2 through the slot 106 incoming fresh water inside the connecting piece 104 and enter through the inlet slots 134 into the filter chamber of the filter cartridge, through the filter and through the filter outlet 135 into the intake pipe of the tank or the Device forwarded.

FIG. 14 shows a further sectional view through the tank bottom 129 and a tank-side filter connection 101 connected thereto and a filter-side tank connection 102 inserted therein from the bottom side of the tank. Therein, the bypass or short-circuit lines 106 and 165 can be seen very well, which show a corresponding passage of the unfiltered fresh water into the tank outlet region 168. In, as in the example shown, inserted cartridge with correct axial coding takes place a correspondingly provided waste of fresh water to be filtered by the formed in the wing-like protruding housing sections 136.1 by-pass holes 160th Instead of the 120 ° offset three axial coding structures shown here by way of example, four, five or for example six such structures may be formed. The distance between the individual complementary axial coding structures can be either symmetrical or unbalanced.

FIGS. 15 to 20 show a further embodiment of an axially coded tank filter connection structure 201 and 202, here in combination with an axial seal 202.1. This axial seal 201.1 is formed in the form of a circular elastically deformable sealing lip with a certain axial length, in order to be able to reliably and reliably compensate for certain axial insertion tolerances in a particularly advantageous manner.

Here too, axially aligned coding structures are found as axial protrusions 236.1 of the filter housing 236 and axial recesses 236.2 corresponding to the previously described embodiment with the numbering circle 100. In addition, further axially oriented coding structures 236.3 are formed as slots in the frontal housing member 236.1, which are both for coding as well as possibly for the supply of fresh water in the interior of the filter-side connection socket can serve.

The axial coding structures 236.2 and 236.3 are assigned in the tank-side filter connection base 201 complementarily shaped, axial Anschlusskodierstrukturen in the form of axially projecting from the tank bottom protrusions 201.1, as shown in Figure 16. In principle, this embodiment could represent the reversal of the coding structure of the embodiment described for the number range 100. However, both embodiments represent only possible examples and may well be modified and / or by others Coding structures and seal variants are supplemented and / or replaced.

FIG. 17 shows a bottom view of a tank-side filter connection 201 and a filter-side tank connection 202 inserted therein with a slightly modified axially coded connection structure 236.4 and 201.5 in relation to the axially coded connection structure 236.1, 236.2, 236.3 and 201.1 described above. The filter-side recess 236.4 is here in the form of an obliquely extending and frontally opening on the filter housing 236 slot, which is suitable for receiving a radially from the tank side filter connection element 201 inwardly facing, nose-shaped Kodierelementes 201.5. The oblique course of the slot 236.4 takes into account an axial insertion movement which is to be fixed for fixing the filter cartridge 231 with a final rotational movement. A filter cartridge without a corresponding axially aligned, slot-shaped recess 236.4 can not be used in a so-coded tank-side filter connection socket 201. Also in this embodiment, by way of example only, a three-point coding is provided in a positioning which is preferably offset by 120 °, but this is not mandatory and can certainly be supplemented and / or modified by other positioning.

Figures 19 and 20 show the two elements described above and their essential features, each in a separate representation.

FIGS. 21 to 26 show further embodiments similar to axially coded connection structures, in which axial coding structures 336.1, 336.2 and 337 corresponding to FIGS. 22, 24 and 26 for the respectively illustrated, filter-side tank connections are shown Distinction between each other in different angular positions are arranged to each other. The tank-side filter connections 301 according to FIGS. 21, 23 and 25 show the complementary axially coded connection structures of the respectively associated tank-side filter connection elements as further possible embodiments of different coding structures.

FIGS. 27 to 38 show further possible embodiments of encryption and / or fixing structures for tank filter connection elements. Here, FIGS. 27 to 30 show a first, FIGS. 31 to 34 a second, and FIGS. 35 to 38 a third possible embodiment of bayonet connections, in particular double or multiple bayonet connections, in addition to those already explained in FIGS Embodiments.

The focus in the embodiments of Figures 27 to 38 lie in the presentation of different possible codings in the form of double or multiple bayonet connections or key codes in the form of key lock functions. FIGS. 27 and 30 show the filter-side tank connection coding or fixing structure with eight projections 21.1 and 21.2 in plan view along the longitudinal extension of the filter-side tank connection element, both axially and in a radial angular position offset from one another as two pairs of four are.

The complementary connection or coding structures 20 are shown in the tank-side filter connection element 19 in FIGS. 31 and 32. In this embodiment, according to the figure 32, an angle α between an axis of an indicated xy coordinate system and one through the Opening 20 extending axis shown as a comparatively acute angle α. In order to allow a fixation of the filter-side tank connection element 8 on the tank-side filter connection element 19, the front side to the front arranged coding projections 21.1 must be distributed according to the circumferential distribution of the openings 20 on the tank-side filter connection element 19, so that even an axial insertion of the filter-side tank connection element is made possible. After overcoming the first insertion depth with respect to the coding projections 21.1, rotation must take place about a longitudinal axis running through the filter-side tank connection element until the second set of coding projections 21.2 comes into conformity with the openings 20 and allows a further axial introduction of the filter-side tank element into the tank-side filter element. until a fixation after a further following rotational movement about the longitudinal axis through the filter-side tank connection element.

Figures 31 to 34 illustrate similar embodiments, but with respect to the embodiments 27 to 30 modified contours of the openings 20 and the coding projections 21 complementary thereto as well as in terms of axially and in plan view angularly changed orientations.

Another difference lies in the number of coding structures. In Embodiments 27 to 30, there are eight in total on two levels, and in Embodiments 31 to 34 respectively, only six as two triple-coded protrusion levels. These coding structures described here can also be readily combined with other, for example, axially aligned coding structures in order to allow even further differentiation possibilities for individual tank filter connection connections. FIGS. 39 to 46 show another embodiment of a tank filter connection connection in different views and illustrations, such as oblique top views, sectional views, front view and bottom view of the filter cartridge 29 and a top view of the tank-side filter connection element with and without an inserted filter-side tank connection element (FIG. Figs. 45 and 46).

The essential features of the embodiment of a tank filter connection connection are the frontally projecting from the filter cartridge 31, such as wedge-shaped tips S and arranged between them grooves N. The geometrical dimensions and angular positions of these tips S and benefits N to each other in turn allow different codes or Fixing points for the filter-side connection element on the tank-side filter connection element.

The tips can also be used for positioning when inserting the filter cartridge in the tank connection piece, in particular in optically non-visible terminals, e.g. to prevent damage to the sealing and / or other structures.

In this case, the slot spacings and / or the slot widths and / or the widths of the tips or projecting wings as well as their lengths and / or distances, which must correspond to corresponding structures on the tank-side filter connection element, are particularly suitable for coding Filter cartridge to allow.

These corresponding coding and / or fixing structures are ribs R (FIG. 45) formed on the tank-side filter connection element, the interaction of which with those on the filter side Tank connection element formed coding and / or fixing structures N and S are best seen in the figure 46. The ribs R are in this case formed on a filter-side tank connection element partially enclosing, wall-shaped base SO.

The coding and / or fixing structure described above may also be designed to be complementary in a modified embodiment, ie grooves instead of ribs and ribs instead of grooves. In a further modified embodiment, however, a mixed or combined coding and / or fixing structure by forming grooves and ribs on the one and / or other tank or filter-side connection element is quite possible.

Figures 47 to 49 illustrate a further embodiment in which the filter 31 is arranged along a tank wall, two angularly shaped ribs R having and engaging in two complementary slots S guide is inserted into the interior of the tank. The tank has in its bottom 29 a polygonal, here hexagonal, filter connection element 23 and from within this connection element through the tank wall leading to the outside TankablaufÖffnung 35.

On the one hand to allow sufficient water drainage through this wall-side tank drain opening 35 and on the other hand as complete as possible emptying of the tank, the polygonal connecting element 23 is formed as at the bottom of the tank with bevelled at its top polygon. The filter-side tank connection element 32 in the form of a conically shaped, likewise polygonal shaped seal 32 has a correspondingly complementary inclined connection surface. As a result, the filter cartridge 31 is guided and fixed by the ribs R and complementary slots S perpendicular to the tank wall down into the interior introduced the tank and form-fitting and sealing are used by the coding structure thus formed with the tank bottom for filtering the water in the tank.

Preferably, in this embodiment, as well as in all other embodiments also, a bypass structure, not shown here may be formed to allow a blending of the filtered water. A supplementary rib-shaped structure R and a complementary slot-shaped coding structure S are formed here by the end-side recess S in the filter wall and the complementary shape R of the outlet opening 35 in the bottom region of the tank wall. These too can be modified accordingly, e.g. in a square shape, a triangular shape or other as well as further recesses and / or projections having structure to distinguish differently approved filter types.

Another embodiment of a square coding for a tank-filter connection are represented by FIGS. 50 to 53. This embodiment has a bypass structure in addition to the embodiment shown in FIG. This bypass structure comprises in the end-side housing extension of the filter cartridge 73 has an opening in the form of a bore 160, which in overlap with an opening formed in a tank-side filter base connection element 77 opening 165 the flow of raw water in the tank to the tank-side device connection in the discharge area of the tank for admixing with the filtered through the filter cartridge water allows. In this case, the bypass opening 160 is formed on the filter side in the end extension of the filter and realizes a waste device in combination with the tank-side filter connection element 77. Another possibility for realizing a waste device could be achieved by the arrangement of this bypass opening 160 relative to an opening formed in the outer shell 84 opening 106, then optionally in the interior of the filter cartridge and / or inside the tank-side connection element a corresponding channel guide must be formed to the so released waste water to mix the filtered by the filter cartridge from the outflow opening 35, filtered water.

A further waste structure can be realized by forming a bypass opening 160.1 in the polygonal, filter-side tank connection element 32, here in the form of a four-edged molded seal 32, which in turn corresponds to the opening 165 formed in the tank-side filter connection 77. The size of the opening 161.1 in turn determines the amount of waste. In this embodiment, the waste device is realized directly in the sealing region of the polygonal-shaped tank filter connection.

FIGS. 54 and 55 show an embodiment of a tank filter connection in which a longitudinal axis II extending through the filter-side tank connection element 7 is oriented at an oblique angle to a longitudinal axis I extending through the housing of the filter cartridge 31, here preferably at an acute angle .phi. This oblique or even cranked or also beveled orientation of the filter-side tank connection element 4 relative to the rest of the filter housing forms a further form of mechanical coding, which can be combined with other, already described above, coding forms, in particular with a polygonal connecting element shown here in the form of a octagon. This octagon may be preferred also be designed as a molded seal and, as shown here, a bypass or Verschnittvorrichtung in the form of an opening 160, which in the presence of a complementary element in the tank side

Filter connection element allows a corresponding waste of the water to be filtered.

FIG. 54 shows the filter cartridge 31 in an oblique manner

Bottom view with the filter side

Connection element 4 and its essential features can be seen. In contrast, Figure 55 shows a

Side view, in which the angulation between the

Cartridge housing 31 and the filter-side tank port 4 is shown for an exemplary angle.

FIG. 56 shows a further embodiment in which the tank 66 is in turn designed as a plug-in tank in which a cartridge 31 for filtering the water contained therein is connected to a tank-side filter connection element 2. This tank-side connection element 2 is connected via a line, here preferably in the form of a stable tube, to the tank-side device connection 68. This tank-side device port 68 is guided by the operational bottom side region of the tank 66 spaced from the tank interior to the outside. In this embodiment, the device connection 68 is fixed by way of example in a recess embedded in the upper edge of a tank wall, which can be advantageously designed as a releasable connection, so that an easy removal and cleaning is made possible.

The operation of the tank is possible by simply inserting into a suitably trained recording a device, or its filling with fresh, then filtered through the filter 31 by pulling out water. The tank-side filter connection element 2 can in this case all Have coding and / or fixing and / or sealing features described above, so that reliably in this drawer embodiment, the use of a non-operationally provided filter cartridge can be excluded, which also applies to the embodiment of Figures 47 to 49.

Two further possible embodiments of coding of the connection between tank and filter are shown and described with reference to FIGS. 57 and 58. In the figure 57, the housing of the filter cartridge 53 itself has a polygonal outer contour in the form of a hexagon, which can be inserted into a complementary, tank-side polygonal coding and / or fixing structure 23. The solid lines show the filter cartridge 53 in a view obliquely from below with a basically flat bottom in the middle of the filter outlet 35 for the filtered water is exemplified as a cylindrical protruding tube with two end-side axially projecting lugs 35.1 and 35.2. This cylindrically projecting outlet element 35 is coded by the two axially projecting wings and forms with its end face opposite the end face of a complementary outlet and receiving element 68 formed in the tank-side filter connection with its coding grooves and 68.1 and 68.2 an axial coding and / or sealing structure or -contour. The filter cartridge 53 can only be plugged into the tank-side filter connection element 1 in a functional manner if the front side of the filter outlet 35 sealingly mates with the end face of the tank-side device outlet 68.

The hexagonal outer contour of the filter cartridge 53 exemplified here can be fixed in the connection socket 23 of the tank-side filter connection element 1 in the embodiment shown by the solid lines and possibly also be inserted sealingly. Here, the inner circumference of the connection base 23 serves for fixing and optionally for sealing against the outer circumference or against the connection thereof.

In order to show a further possibility of attachment between the polygonal outer contour of the filter cartridge 53 shown here by way of example as a hexagon and a correspondingly complementary tank-side connection socket 1, the housing 36 of the filter cartridge 53 is shown extended by the dashed lines as compared to the previously described filter bottom. This polygonal, opposite the bottom of the filter cartridge protruding connecting ring can be used to fix the filter cartridge via the tank-side filter connection piece 23, again fixing and preferably sealing depending on the version, slipped over or plugged in until the two inner encodings, the filter outlet 35 and the tank outlet 68, sealingly abut each other or their wing-like and complementary slot-like coding structures shown here by way of example, sealingly abut each other or interlock. For the water supply from the tank into the interior of the filter cartridge corresponding openings and / or channels are provided, which are not shown here. Also provided and not shown may be corresponding bypass structures, as already described in detail above. FIG. 57 thus shows both a fixation of the filter cartridge on the inner circumference of the tank-side filter connection element 23 and on its outer circumference 24.

By contrast, FIG. 58 shows an embodiment modified in such a way that the housing 36 of the filter cartridge is shown as an example and the filter outlet 35 as a polygonal structure, here again by way of example as a hexagon, which in addition again has an end-face coding in the form of two axially projecting, coding, triangular tips or wings. Again, the filter cartridge can only be operatively connected to the tank-side filter connection element 1, when the two outlet structures 35 and 68 can be attached to the front side axially sealingly to each other. The presentation of further coding and / or fixing structures has been omitted for reasons of clarity. However, all the structures already described above can also be provided accordingly here. It is also true for the two embodiments according to FIGS. 57 and 58 that these coding structures can also be exchanged and / or modified between the filter side and the tank side and / or supplemented by further contours and / or structures.

Two further embodiments with respect to a bypass configuration between a tank-side filter connection element 1 and a filter-side tank connection element 2 are shown in FIGS. 59 to 62. FIGS. 59 and 60 show, by way of example and diagrammatically, a bypass arrangement BY, which enables a mixture between water filtered through the filter cartridge 53 and water that is not filtered or otherwise filtered or processed. The bypass or blending line BY is in this embodiment combined with a bayonet catch BJ in such a way that an opening BY is provided in a bayonet wing BJ which corresponds to a further bypass opening BY arranged on a bayonet slot BJ which is complementary to the bayonet wing Inserted filter cartridge a corresponding bypass guide is realized. In the embodiment shown here, the bypass opening BY shown in the tank-side filter connection element 1 is guided from the front-side connection region of the tank-side connection socket to below the point in which the filter-side tank connection piece 4 in operationally inserted position ends, so that the past the filter bed of the filter cartridge 53 bypass water mixed with the filtered through the filter bed of the filter cartridge 53 water and the tank-side device port 68 is supplied.

Figures 61 and 62 show a contrast modified embodiment that the bypass line BY is guided over a separate from a main filter bed HF of the filter cartridge 53 processing and / or filter section, which is exemplified here and symbolically as Nebenfilterstrecke NF. This second conditioning and / or filtering section NF may be e.g. an activated carbon filter track and / or other treatment mechanisms and / or media included. After flowing through this secondary filter section NF, the water guided via this bypass section BY is mixed with the water filtered through the filter section HF of the filter cartridge 53, so that it can likewise be removed through the tank-side device connection 68.

In the embodiment of the filter cartridge 53 shown in FIG. 62, the merging of the two water passages separately guided and processed via the main filter HF and the secondary filter NF inside the filter cartridge 53 is exemplarily and schematically represented by an opening into the inner downpipe of the filter cartridge 53. In a modified embodiment, however, a separate outlet opening out of the filter cartridge may well be provided in the direction of the tank-side appliance connection 68, where applicable for all three embodiments, that they all open inside the tank-side filter connection nozzle 32, so that in turn For example, a seal by a positive connection of the two polygonal connection elements of the tank and the filter are possible. The introduction of the bypass flow in the secondary filter section is only possible if the opening also acting as coding opening BY is plugged into the axially from the tank bottom 29 high encryption element 25 with the corresponding filter-side bypass opening BY in the operationally provided state. If no overlap of these two openings is given, then no corresponding waste can be realized. The tank-side filter connection 1 according to FIG. 86 is likewise shown only schematically and by way of example and can be provided with a wide variety of variants of the coding and connection structure already described above, so that optionally only a single one of all six possible angular orientations is enabled for a permissible filter closure. From the representation of such coding structures was omitted at this point for reasons of clarity.

In principle, it also applies to these embodiments in FIGS. 59 to 62 that they too can be combined with all the coding and / or fixing and / or sealing structures described above and / or.

LIST OF REFERENCE NUMBERS

1 connection socket

2 tank connection element

3

4 connecting pieces

6 side slot

23 connection socket

24 sealing surface

25 outer shell

26 blocking element

27 bottom rib

28 bottom rib

29 tank bottom

30 inner rib

31 filter cartridge

32 molded gasket

33 sealing surface

34 entry slot

35 drain opening

36 filter cartridge housing

37 snap element

38 recording

39 lower edge

40 stop

41 floor opening

42 grooves

43 key element

44 tank connection area

45 floor

46 Axial seal

47 dividing line

48 disc

49 ring shoulder

50 valve body 51 spring

52 tank bottom

53 filter cartridge

54 connection sock1

55 outer surface

56 discharge line

57 seal

58 wall

59 wall

60 recess

61 opening

62 base wall

63 base wall

64 base wall

65 bypass opening

66 tank

67 suction connection

68 Device connection

69 longitudinal axis

70 space

71 edge

72 connection element

73 cartridge

74 feet

75 inlet opening

76 inlet opening

77 connection socket

78 base plate

79 sealing surface

80 sealing surface

81 molded seal

82 spout

83 outer wall

84 outer shell

85 adapters

86 adapters 87 Axial projection

88 Axial projection 89 Axial projection

90 Axial projection

91 Axial projection

92 Axial projection

93 Axial projection

94 Axial projection

95 Axial projection

96 axial recess

97 Axial recess

98 Axial recess

99 Axial projection

Claims

Claims:

1. Tank for water-bearing appliances, in particular household appliances, such as vending machines, in particular coffee machines, drinking water dispensers, cooking and baking appliances, steam appliances, in particular steam irons, steam cleaners, high pressure cleaners, air purifiers and conditioners or the like, wherein a suction port on the tank for sucking water from the Water tank is provided with means for generating a negative pressure and a filter connection for connection of a filter cartridge inside the tank, characterized in that the filter connection (1) with at least one, at least one axial projection (99) and / or at least one axial recess (38 ) is provided according to the key / lock principle to a complementary coding structure (98, 37) of a matching filter cartridge (31).

2. Tank according to one of the preceding claims, characterized in that the filter connection of the water tank and a connecting piece of the filter cartridge at least partially enclose each other.

3. Tank according to one of the preceding claims, characterized in that extending the coding structures in the axial and / or radial direction relative to the axis of the connecting piece inserted filter cartridges.

4. Tank according to one of the preceding claims, characterized in that the coding structures are formed at least partially at the same time as fixing elements (16) for fixing the filter cartridge.

5. Tank according to one of the preceding claims, characterized in that a sealing surface is provided for a filter-side axial seal.

6. Tank according to one of the preceding claims, characterized in that the encryption is provided by the number and / or spatial distribution and / or form of individual coding elements of the coding structure.

7. Tank according to one of the preceding claims, characterized in that the coding structure is provided on the circumference of the tank-side filter connection element.

8. Tank according to one of the preceding claims, characterized in that on the tank-side filter connection element, a structure (23) is provided with non-circular circumference.

9. Tank according to one of the preceding claims, characterized in that on the tank-side filter connection element a peripheral surface is provided as a sealing surface (24).

10. Tank according to one of the preceding claims, characterized in that the tank-side filter connection element has a peripheral surface (24) with polygonal cross-section.

11. Tank according to one of the preceding claims, characterized in that the tank-side filter connection element has a peripheral shape (24) with rotationally symmetrical cross-section.

12. Tank according to one of the preceding claims, characterized in that the tank-side filter connection element has a peripheral shape (24) with square cross-section hexagonal cross section, 8-Kantquerschnitt or the like.

13. Tank according to one of the preceding claims, characterized in that the filter-side tank connection element is formed as a coding structure and as a molded seal (32) with a correspondingly formed circumferential surface.

14. Tank according to one of the preceding claims, characterized in that on the housing of the filter cartridge in the installed state externally arranged coding structure (37, 38) is provided.

15. Tank according to one of the preceding claims, characterized in that a latching between the filter cartridge and tankseitigem filter connection element is provided.

16. Tank according to one of the preceding claims, characterized in that a blend setting is provided for blending filtered liquid with unfiltered and / or otherwise treated liquid.

17. Tank according to one of the preceding claims, characterized in that a seal (32) between tankseitigem filter connection element and filterseitigem

Tank connection element provided, which has at least partially a non-round cross-section.

18. Tank according to one of the preceding claims, characterized in that between tank-side filter connection element and filter-side tank connection element a seal (32) is provided with coding structure.

19. Tank according to one of the preceding claims, characterized in that an opening with coding structure for introducing a filter-side key element is provided in the tank bottom.

20. Tank according to one of the preceding claims, characterized in that radial encryption structures are provided.

21. Tank according to one of vorgenanten claims, characterized in that on the tank side

Filter connection element (1) an adapter (85) for connecting a filter cartridge (31) is provided.

22. Tank according to one of the preceding claims, characterized in that an adapter (86) is provided for connection to a device to the tank-side device connection element (68).

23. Device, in particular water-conducting household appliance or device for the preparation of food and / or drinks, such as vending machines, especially coffee machines, drinking water dispensers, cooking and baking equipment, steam and / or high-pressure cleaner, air cleaner and conditioner or the like with a tank, characterized in that the tank is designed according to one of claims 1 to 23.

24. Filter cartridge for insertion into a tank according to one of the preceding claims 1 to 23, characterized in that mechanical coding structures (32) are provided on the tank connection of the filter cartridge, which are adapted to corresponding mechanical coding structures (21) on the filter connection of the water tank.