WATER FILTER AND ASSEMBLY THEREOF

Abstract

The present disclosure concerns a filter device for filtering source water for the purpose of obtaining potable water; and further concerns a method for assembly of such a device.

Claims

1. A water filter defined between bottom wall, peripheral wall and a top wall and comprising four concentric compartments including, in respective peripheral to central direction a first, second, third and fourth compartment, defined by divider walls, the filter being configured to have one or more water inlets at the top wall leading into the first compartment, a first water passage linking between the bottoms of the first and second compartments, a second water passage linking the tops of the second and the third compartment, a third water passage linking the bottoms of the third and fourth compartment and a fourth water passage between the fourth compartment and a filter outlet formed at the center of said bottom wall; wherein the filter is formed from building blocks that comprise: a base member comprising the bottom wall with the central filter outlet, the peripheral walls being integral therewith and extending upwardly therefrom, and comprising an integral sleeve formed around said filter outlet and defined by a closed-loop wall and dividing the filter's internal space into a central space and a peripheral space; a sleeve insert formed by closed-loop wall dividing the peripheral space into the first and second compartments; a tubular insert with a lumen defined between an open bottom and a sealed top and fitted over the filter outlet, to divide the central space into the third and fourth compartments; and a lid element sealingly fitted over the base member.

2. The filter of claim 1, wherein the integral sleeve has a sleeve apex and said second water passage is defined above the sleeve apex.

3. The filter of claim 1 or 2, wherein the first and third water passages are defined between the bottom wall and the respective bottom ends of the sleeve insert and the tubular insert.

4. The filter of claim 3, wherein the bottom wall comprises spacer elements extending upwardly therefrom and the bottom of the sleeve insert and the tubular insert rest on said spacer elements to thereby define respective first and third water passages.

5. The filter of claim 4, wherein the spacer elements are constituted by ribs formed on and projecting from said bottom wall.

6. The filter of any one of the preceding claims, comprising an integral tube element fitted around the filter outlet and defining a tube lumen upwardly extending from the filter outlet to a tube inlet, which is at a level below said sleeve apex.

7. The filter of any one of the preceding claims, comprising a porous polisher element fitted within the fourth compartment over the filter outlet.

8. The filter of any one of the preceding claims, wherein at least one of the first, second, third or fourth compartment is divided by one or more horizontal perforated divider elements into vertically arranged sub-compartments.

9. The filter of claim 8, comprising a second perforated divider element formed as an annular element fitted into the second compartment.

10. The filter of claim 8 or 9, comprising a third perforated divider element formed as an annular element fitted into the third compartment.

11. The filter of any one of the preceding claims, wherein the bottom end of at least one of the first, second, third or fourth compartments is fitted with a horizontal bottom perforated element.

12. The filter of claim 11, comprising a second bottom perforated element integrally formed with the sleeve insert and a third bottom perforated element integrally formed with the tubular insert.

13. The filter of any one of the preceding claims, wherein the top end of at least one of the first, second or third compartments is fitted with a horizontal top perforated element.

14. The filter of claim 13, comprising a second top perforated element and a third top perforated element that are integrally formed with one another and constituted by a generally disk-shaped element fitted over the second and third compartments.

15. The filter of any one of the preceding claims, wherein the second and third compartments are vertically divided into respective second bottom and second top sub-compartments and third bottom and third top sub-compartments, and wherein the first compartment comprises a first absorbent, the second bottom sub-compartment comprises a first ion exchanger, the second top sub-compartment comprises a second ion exchanger, the third top sub-compartment comprises an antimicrobial composition, the third bottom sub-compartment comprises a second absorbent, and the fourth compartment comprises a polisher composition.

16. The filter of any one of claims 1-14, wherein the second and third compartments are vertically divided into respective second bottom and second top sub-compartments and third bottom and third top sub-compartments, and wherein the first compartment comprises an absorbent, the second bottom sub-compartment comprises a first ion exchanger, the second top sub-compartment comprises a second ion exchanger, the third top sub-compartment comprises a third ion exchanger, the third bottom sub-compartment comprises an antimicrobial composition, and the fourth compartment comprises a polisher composition.

17. A process for assembly of a compartmentalized water filter defined between bottom wall, peripheral wall and a top wall and comprising four concentric compartments including, in respective peripheral to central direction a first, second, third and fourth compartment, defined by divider walls and configured to have one or more water inlets at the top wall leading into the first compartment, a first water passage linking between the bottoms of the first and second compartments, a second water passage linking the tops of the second and the third compartment, a third water passage linking the bottoms of the third and fourth compartment and a fourth water passage between the fourth compartment and a filter outlet formed at the center of said bottom wall; the process comprising: (a) providing a base member that comprises the bottom wall with the central filter outlet, the peripheral walls integral therewith and extending upwardly therefrom, and comprising an integral sleeve formed around said filter outlet and defined by a closed-loop wall and dividing the filter's internal space into a central space and a peripheral space; (b) inserting a generally cylindrical sleeve insert formed by closed-loop wall into the peripheral space to thereby divide it into the first and second compartments; (c) inserting a tubular insert with a lumen defined between an open bottom and a sealed top into the central space and over the filter outlet, to thereby divide the central space into the third and fourth compartments; and (d) introducing water treatment media into one or more of the first, second or third compartments; and (e) sealingly fitting a lid element over the base member.

18. The process of claim 17, wherein (c) precedes (b).

19. The process of claim 17 or 18, comprising introducing a porous polisher element over the filter outlet and fitting the lumen of the tubular insert over the polisher element.

20. The process of any one of claims 17-19, introducing second and third annular perforated horizontal divider elements into the second and third compartments, respectively, to thereby divide each of the second and third compartment into, respective second bottom and second top sub-compartments and third bottom and third top sub-compartments.

21. The process of any one of claims 17-20, wherein (d) comprises, in any order (d1) introducing a first water treatment medium into said first compartment; (d2) (i) introducing a second water treatment medium into the bottom of the second compartment, (ii) introducing a second horizontal perforated annular divider element into the second compartment to thereby divide the second compartment into a second bottom sub-compartment containing said second water treatment medium and a second top sub-compartment, and (iii) introducing a third water treatment medium into the second top sub-compartment; and (d3) (i) introducing a fourth water treatment medium into the bottom of the third compartment, (ii) introducing a third horizontal perforated annular divider element into the third compartment to thereby divide the third compartment into a third bottom sub-compartment containing said fourth water treatment medium and a third top sub-compartment, and (iii) introducing a fifth water treatment medium into the third top sub-compartment.

22. The process of any one of claims 17-21, comprising, between (d) and (e) (e) introducing a circular perforated element and seating it on top of the sleeve apex to thereby define a horizontal top perforated element of the second and of the third compartments.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to better understand the subject matter that is disclosed herein and to exemplify how it may be carried out in practice, embodiments will now be described, by way of non-limiting example only, with reference to the accompanying drawings, in which:

[0044] FIG. 1 is a 3-dimensional representation of a filter according to an embodiment of this disclosure.

[0045] FIG. 2 is a perspective longitudinal cross-section through the filter along axis II-II.

[0046] FIG. 3 is an exploded perspective cross-sectional view of the filter.

[0047] FIGS. 4A, 4B, 4C and 4D are enlarged perspective cross-sectional views of the base member, sleeve insert, tubular insert and lid element, respectively.

[0048] FIGS. 5A-5H are assembly steps of the filter of the illustrated embodiment.

DETAILED DESCRIPTION OF EMBODIMENTS

[0049] The invention will now be illustrated with reference to an exemplary embodiment illustrated schematically in the annexed Figures.

[0050] Reference is first being made to FIG. 1 showing a filter 100 with an external casing defined by base member 102 and lid element 104 sealingly fitted over the base member. Formed within recess 106 at the top of lid element 104 are a plurality of filter inlets 108 which, as will be explained below, lead into a first, most peripheral compartment of the filter.

[0051] FIG. 2 shows the filter's internal structure. Vertical divider walls, their configuration to be explained below, divide the internal space into four concentric compartments consisting of a first compartment 110, second compartment 112, third compartment 114 and a fourth compartment 116 (better seen in FIG. 5C). The second and third compartments 112, 114 are divided by respective second and third horizontal perforated elements 118, 120 into respective second bottom and top sub-compartments 112A, 112B, and third bottom and top sub-compartments 114A, 114B. Fitted on top of the second and third compartments is a perforated disk-shaped element 122 which can more clearly be seen in FIG. 3, and which defines a second top perforated annular element 122A fitted over a second compartment and a third top perforated annular element 122B fitted on top of the third compartment; the second and third top perforated annular elements 122A and 122B are integral with one another.

[0052] In addition, as can also be seen, the filter comprises second and third bottom perforated elements 124, 126 at the bottom of the second and third compartments, respectively. All these perforated elements have the prime purpose of confining water treatment media into defined compartments.

[0053] FIGS. 3-4D illustrate the building blocks of the filter (other than the water treatment media to be described further below). As can be seen, the filter is structured from a number of basic building blocks that are seen in enlarged views in FIGS. 4A-4D and some additional auxiliary elements.

[0054] First, as can be seen in FIGS. 3 and 4A, the base member 102 includes a bottom wall 130, peripheral walls 132, an integral sleeve 134 concentric with a central filter outlet 136 formed in the bottom wall. The integral sleeve 134 divides the internal filter space into a peripheral space 138 and a central space 140 (each of which is further compartmentalized in the assembled filter, as will be described further below). Formed around filter outlet 136 is an integral tube element 142 having a lumen extending from the outlet up to the tube's apex 146 which defines a tube inlet 148. It should be noted that in some embodiments, such integral tube may not be included. The walls of the integral tube 142 are configured to provide a seat for the polisher element 150, as seen in FIG. 2. As will also be understood from the explanation below, the filter is configured to have a first water passage 200 linking the bottom ends of the first and second compartments 110, 112; a second water passage 202 linking the top ends of the second and third compartments 112, 114; a third water passage 204 linking the bottom ends of the third and fourth compartments 114, 116; and a fourth water passage 206 linking the fourth compartment 116, through polisher element 150 and the lumen 152 formed within polisher element 150 to the filter outlet 136. This creates a generally curvilinear (or serpentine) descending flow path beginning from the filter inlet 108, represented by arrow 208, and leading to the filter outlet 136, as represented by arrow 209.

[0055] Other building blocks of the filter include a cylindrical insert 154, a tubular insert 156 and lid element 104. Auxiliary elements that may be absent from some embodiments include the second and third annular perforated divider elements 118, 120 and the generally disk-shaped element 122. Also included in this specific embodiment, as already pointed out above, are second and third bottom perforated elements 124, 126 integrally formed with inserts 154 and 156, respectively, which may be absent in some embodiments.

[0056] Sleeve insert 154 is inserted within the peripheral space 138 and is concentric with the integral sleeve 134. The proper positioning of the sleeve insert is guided by the internal rim 158 of the second bottom perforated element 124. Sleeve insert 154, thus, defines a divider wall that divides the peripheral space into the first and second concentric compartments 110, 112, as seen in FIG. 2.

[0057] Formed at the bottom wall of base member 102 are ribs 133 outwardly projecting from bottom wall 130. The bottom end of sleeve insert 154 rests on these ribs and the space below thus defines the first water passage 200.

[0058] Tubular insert 156 has a lumen 160 that is defined between a bottom opening 162 and a sealed top end defined by integral end wall 164. The tubular insert 156 has a tubular projection 166 extending upwardly from integral end wall 164, which serves as a support for disk-shaped element 122 and configured to accommodate the downward projecting annular element 123 to thereby assist in positioning of element 122. Also, lid element has two integral downwardly projecting annular elements, these being a respective central one 171 and a respective peripheral one 173 that bear on disk-shaped element 122; and consequently, through the intermediary of disk-shaped element 122, the tubular projection 166 ensures that tubular insert 156 is maintained tightly in its position after securing the lid element 104 on top of the base member 102.

[0059] The lumen 160 is sized and configured for accommodating polisher element 150 and maintain sufficient clearance for the fourth water passage 206.

[0060] In addition to ribs 133, formed on bottom wall 130 of base member 102, are also ribs 135 which upwardly project from the bottom wall into the central space 140. The bottom portion of tubular insert 156 is sized and configured to fit snugly against the internal face of integral sleeve 134 and this snug association ensures proper positioning such that it is also concentric with the filter outlet. Once fully inserted, tubular insert 156 fits on top of ribs 135 and the clearance between the bottom end of insert 156 and the bottom wall defines the third water passage 204, while the clearance between the internal faces of lumen 160 and the integral tube 142 define the fourth water passage 206.

[0061] The fourth building block is lid element 104, with openings 108 that leads into the first compartment 110 and constitute the filter inlet. The lid element 104 is configured for engagement with the disk-shaped element 122 and the sleeve insert 154 so as to hold all the inserts tightly in position. Lid element 104 may also include, by some embodiments, an indicator element of the kind disclosed, for example, in PCT Application having the publication number WO 2008/044230.

[0062] Elements 118, 120 and 122 are auxiliary elements and may be absent from some embodiments of this disclosure. While in embodiments in which these auxiliary elements are absent the different compartments may not be fully physically separated, a filter without these elements may nonetheless function effectively for water treatment to finally obtain potable water, which is the function of the filter of this disclosure.

[0063] A sequence of steps for assembly of such filter is illustrated in FIGS. 5A-5H. It should be noted that this is an exemplary sequence and other sequences may also be applicable, as generally described above.

[0064] In a first of such steps, polisher 150 is seated within the lumen 144 of integral tube 142, such that the polisher lumen 152 fits over the filter outlet 136. Then, tubular insert 156 is inserted within the internal central space 140 such that the tubular insert lumen 160 envelops element 150; annular ring 168, integral with and downwardly projecting from end wall 164, hold element 150 in position.

[0065] At the next step, seen in FIG. 5C, sleeve insert 154 is fitted within the peripheral space, thus forming first, second, third and fourth compartments 110, 112, 114, 116, respectively.

[0066] Steps described below illustrate, among others, the addition of water treatment media. These are qualified as first, second, third, fourth and fifth in correspondence to the sequence of media encountered by the water in its flow path through the filter (encountering the first medium, then the second medium, etc.).

[0067] At the next step, seen in FIG. 5D, which is comprised of sub-steps, a first water treatment medium 210, which may, for example, be an absorbent such as activated carbon, is added into the first compartment 110; a second water treatment medium 212 is added into the bottom of the second compartment 112 (such as an ion exchange resin for selective removal of heavy metals); and a fifth water treatment medium, such as an antimicrobial brominated polymer is added to the bottom of a third compartment 114.

[0068] Then, as seen in FIG. 5E, second and third perforated horizontal divider annular elements 118, 120 are inserted into the second and third compartments, respectively. As can be seen, the sleeve insert is formed with internal vertical ribs 155 with top ends 157 that serve as a seat for element 118. Similarly, tubular insert 156 is formed with an external step 163 serving as a support seat for element 120.

[0069] At the next step, which is in fact also comprised of sub-steps, seen in FIG. 5F, third water treatment medium 214 is added into the second top sub-compartments 112B, which may be a second ion exchanger material such as ASM-10-HP for arsenic removal and a fourth water treatment medium 216 is added into the third top sub-compartment 114B, which, for example, may be an ion exchange resin for scale reduction, such as C107E.

[0070] In the next step, shown in FIG. 5G, the disk-shaped element 122 is fitted over the second and third compartments and over the tubular extension 166 of insert 156.

[0071] Finally, as seen in FIG. 5H, the lid element is fitted on top of base member 102 with its downward annular projection 170 fitting into a matching trough 172 in the base member, and through an integration process which may, for example, be ultrasonic welding, becomes sealingly engaged to the base member in a water-tight manner.