WATER FILTER CARTRIDGE HAVING TANK LIMESCALE PROTECTION

Abstract

The invention relates to a water filter cartridge comprising a housing and a filter-side tank connection element for insertion into a water tank, more particularly into a water tank of a household appliance (11), and a filter section for treating the water to be taken from the water tank. It is distinguished by the fact that the water filter cartridge comprises a reservoir chamber with a means to counter precipitations in the water tank, where the reservoir chamber is designed separate from the filter section and its flow guideway for the water running through the filter section to be treated, in such a way that there is no contact between the water flowing through the filter section and the means to counter precipitations, and that the reservoir chamber has at least one passage for the means, whereby the means to counter precipitations is in contact with the unfiltered water in the water tank.

Claims

1. A water filter cartridge (1) having a housing (2) and a filter-side tank connection element (3) for insertion into a water tank (10) of a household appliance (11), and a filter section (4) to treat water (8) to be taken from the water tank wherein the improvement comprises a reservoir chamber (6) with a means (5) to counter precipitations in the water tank, wherein the reservoir chamber (6) is separate from the filter section (4) and has a flow guideway for the water (8.1) through the filter section to be treated, in such a way that the reservoir chamber has at least one passage to the means, wherein the means to counter precipitations is in contact with the unfiltered water in the water tank.

2. The water filter cartridge as claimed in claim 1 wherein the reservoir chamber (6) is arranged in and/or on the housing (2) of the water filter cartridge (1).

3. The water filter cartridge as claimed in claim 1 wherein the reservoir chamber (6) for the means (5) to counter precipitations is mounted in a lid (2.1) of the housing of the water filter cartridge.

4. The water filter cartridge as claimed in claim 1 wherein a wall of the reservoir chamber (6) is at least partly a perforated wall or sieve.

5. The water filter cartridge as claimed in claim 1 wherein the means to counter precipitations (5) is a counter limescale precipitation agent.

6. The water filter cartridge as claimed in claim 1 further comprising means (5) to counter limescale precipitations.

7. The water filter cartridge as claimed in claim 1 wherein the means (5) to counter limescale precipitations includes a hardness stabilizer.

8. The water filter cartridge as claimed in in claim 7 wherein the means (5) to counter limescale precipitations is a sparingly soluble polyphosphate.

9. The water filter cartridge as claimed in claim 1 wherein the means (5) to counter limescale precipitations is a readily soluble sodium polyphosphate.

10. The water filter cartridge as claimed in claim 8 further comprising a stabilizing agent for the sparingly soluable polyphosphate.

11. The water filter cartridge as claimed in claim 10 wherein the stabilizing agent is a basic anion exchanger material with polyphosphate ions as counterions.

12. The water filter cartridge as claimed in claim 10 wherein the stabilizing agent is a weakly basic anion exchanger with polyphosphate ions as counterions.

13. The water filter cartridge as claimed in claim 1 further comprising a filter-side connection element for connection to a suction port of a water tank.

14. A method of filtering water with a water filter cartridge comprising: (a) utilizing a filter housing (2) having a filter section (4) for treating water (8) from a water tank and a filter-side tank connection element (3) for insertion into a water tank (10) of a household appliance (11) and; (b) having a reservoir chamber (6) with a means (5) to counter precipitations in the water tank by using at least one passage connecting the means to counter precipitations with unfiltered water in the water tank to reduce precipitations in the water tank, where the reservoir chamber (6) and its at least one passage is separate from the filter section (4) and its flow guideway for the water (8.1) running through the filter section.

15. The method of claim 14 wherein the step of having a reservoir chamber includes mounting the reservoir chamber on the lid of the water filter cartridge.

16. The method of claim 14 wherein the step of having a reservoir chamber includes the step of mounting the reservoir chamber to a lower end of the water filter cartridge.

17. A water filter device comprising: (a) a water filter housing having an inlet and an outlet and a water reservoir connection to connect to a water reservoir containing untreated and/or partially pretreated water; (b) a filter section disposed inside the filter housing and a first flow path for water from the inlet to the water reservoir through the inlet and filter section to outside the water reservoir through the outlet; and (c) a reservoir chamber connected to the water filter housing containing a chemical composition to prevent precipitation deposits in the water reservoir with a second flow path for water from the water reservoir containing untreated and/or partially pretreated water through the reservoir chamber and back into the water reservoir containing untreated and/or partially pretreated water.

18. The water filter of claim 17 wherein the reservoir chamber is connected to the water filter housing near the outlet.

19. The water filter as claimed in claim 17 wherein the reservoir chamber for the means to counter precipitates is mounted in a lid in the water filter housing of the water filter device.

20. The water filter as claimed in claim 17 wherein the chemical composition to prevent precipitation deposits is a sparingly soluble polyphosphate.

Description

WORKING EXAMPLE

[0050] The present invention is elucidated in more detail below with the appended figures and with the description that refers to them.

[0051] In the figures:

[0052] FIG. 1 shows, by way of example and schematically, a water filter cartridge in longitudinal cross section, on insertion into a water tank, which is likewise shown in longitudinal cross section.

[0053] FIG. 2 shows, by way of example and schematically, a detail of an alternative embodiment to FIG. 1 of a water filter cartridge, having a depot for a means to counter limescale precipitations, in front elevation.

[0054] FIG. 3 shows, by way of example and schematically, a sectional representation for the embodiment according to FIG. 2

CONSTRUCTION

[0055] FIG. 1 shows a water filter cartridge 1 on insertion into a water tank 10, the housing of which is numbered 10.1. For this purpose, the filter-side tank connection element 3 is joined to a tank-side filter connection element 10.2. Preferably by means of a plug connection.

[0056] The water filter cartridge 1 comprises a housing 2, an inlet opening 1.3 and an outlet opening 1.4 for the ingress and egress of the water 8, stocked in the water tank, into the filter cartridge 1 and out again. This water 8 is guided via a filter section 4, for treatment for use in, for example, a hot-beverage machine 11 that is connected downstream. A filter section of this kind may be formed in the inflow chamber 1.1 and/or the outflow chamber 1.2. The arrows 8.1 symbolize the running direction of the water when it is taken from the water tank 10, when the filter cartridge 1 in the ready-inserted state is working in filter operation.

[0057] In accordance with the invention, additionally to the filter section 4 and formed separately from it, the water filter cartridge 1 comprises a depot in the form of a reservoir chamber 6 for at least one means 5 to counter precipitations in the water tank, more particularly for at least one means to counter limescale precipitations in the water tank, where contact openings 7 are provided which connect the depot in the form of the reservoir chamber 6 to the water 8 stocked in the water tank 10.

[0058] The reservoir chamber 6 may be arranged in the housing 2 of the water filter cartridge 1. In the case depicted, this is realized in a lid 2.1 of the housing 2.

[0059] The at least one means 5 to counter precipitations, more particularly to counter limescale precipitations, in the water tank may comprise an acidic cation exchanger, more particularly a weakly acidic cation exchanger, and/or a hardness stabilizer and/or a sparingly soluble polyphosphate, more particularly based on calcium.

[0060] The at least one means 5 to counter precipitations, more particularly to counter limescale precipitations, in the water tank may also comprise a readily soluble polyphosphate based on sodium.

[0061] Furthermore, the at least one means 5 to counter precipitations, more particularly to counter limescale precipitations, in the water tank may comprise a basic anion exchanger material, preferably with polyphosphate ions as counterions. To provide a higher capacity, a weakly basic anion exchanger material is used, more particularly a weakly basic anion exchanger material with polyphosphate ions as counterions.

[0062] And the weakly basic anion exchanger material may be provided as a stabilizing agent for the polyphosphate.

[0063] The arrows 8.1 symbolize the inflow of the water 8, stocked in the water tank 10, to the at least one means 5 to counter precipitations, more particularly to counter limescale precipitations, in the water tank. It flows through the contact openings 7 into the depot to the means 5. Optionally there is also a nonwoven 9 or the like in order additionally to enclose the means 5.

[0064] The arrows 5.1 symbolize water 8 which is stocked in the water tank 10 and which has already been processed with the at least one means 5 to counter precipitations, more particularly to counter limescale precipitations, in the water tank. Owing to the higher concentration of the processing substances from the at least one means 5 in the water 8 in the vicinity of the at least one means 5, in comparison to water stocked elsewhere in the water tank and having not yet made contact with the at least one means 5, a concentration balancing is triggered, which in the course of the storage time brings about the processing of the rest of the water stored in the water tank, as well, and hence in accordance with the invention results in the avoidance of precipitations, especially limescale precipitations, on the surfaces coming into contact with the water.

[0065] FIG. 2 shows, by way of example and schematically, a representation of an alternative embodiment to FIG. 1 of a water filter cartridge 1, having a filter-side tank connection element 3 and a depot in the form of a reservoir chamber 6 for at least one means 5 to counter precipitations, more particularly to counter limescale precipitations, in front elevation. In this case, a depot 6 for the at least one means 5 to counter precipitations, more particularly to counter limescale precipitations, may be arranged in and/or on the housing 2. For visualization of the preferably granular means 5, small circles are shown. The granules 5 may be held in the depot 6 via a cover means 2.1, e.g., corresponding to the lid 2.1 in the version according to FIG. 1.

[0066] Here as well, contact openings 7 may permit access for water to the means 5. The rectangular representation of the contact openings 7 is purely by way of example, for better differentiation, in this visualization. The openings may quite easily also have other contours and/or cross sections. This embodiment, with the depot 6 arranged comparatively near to the water inlet and/or to the water outlet, for the at least one means 5 to counter precipitations, more particularly to counter limescale precipitations, may be advantageous, for example, for water tanks whose height is low. In particular, on the basis of the low arrangement relative to the operating position of the water filter cartridge, a maximum contact time of the limescale preventative with the water surrounding the water filter cartridge can be realized.

[0067] FIG. 3 shows a sectional representation for the version of a water filter cartridge 1 that is depicted in FIG. 2, with depots 6, arranged on opposite sides of the housing 2, for the at least one means 5 to counter precipitations, more particularly to counter limescale precipitations. Contact openings for access for water to the at least one means 5 are not shown, in order to simplify the representation, but may be present. The rest of the reference numerals correspond to the features of the water filter cartridge 1 as set out in relation to FIG. 1.

LIST OF REFERENCE NUMERALS

[0068] 1 Water filter cartridge [0069] 1.1 Inflow chamber [0070] 1.2 Outflow chamber [0071] 1.3 Inlet opening [0072] 1.4 Outlet opening [0073] 2 Housing [0074] 2.1 Lid [0075] 3 Filter-side tank connection element [0076] 4 Filter section [0077] 5 Means to counter limescale precipitations [0078] 5.1 Water processed with means to counter limescale precipitations [0079] 6 Depot [0080] 7 Contact openings [0081] 8 Water [0082] 8.1 Arrow [0083] 9 Nonwoven or the like [0084] 10 Water tank [0085] 10.1 Housing [0086] 10.2 Tank-side filter connection element [0087] 11 Household appliance, esp. hot-beverage machine