WO2017103150A1

WO2017103150A1 - Filter cartridge

Info

Publication number: WO2017103150A1
Application number: PCT/EP2016/081496
Authority: WO
Inventors: Hans ORBEN
Original assignee: Orben Wasseraufbereitung Gmbh & Co. Kg
Priority date: 2015-12-16
Filing date: 2016-12-16
Publication date: 2017-06-22
Also published as: DE102015225408A1

Abstract

A filter cartridge (1) for insertion into a filter housing (2) of a water treatment plant is described, wherein the filter cartridge (1) is assembled from a plurality of filter elements (3a, 3b, 3c) which lie behind one another in an axial extent and have in each case one interior space (7) which is formed by a filter cup (4) and a filter cover (6), wherein each filter cup (4) comprises a circumferential wall (5a) and a bottom wall (5b), a filter medium can be introduced into the interior space (7), and first throughflow openings (8) are provided in the filter cover (6) and second throughflow openings (9) are provided in the bottom wall (5b). The invention was based on the problem of providing a filter cartridge (1) which is variable with regard to the length thereof, and can be inserted on site into predefined filter chambers (24) of different length of a pressurized water treatment plant. The problem is solved by virtue of the fact that each filter element (3a, 3b, 3c) has a lower and upper connecting section (10a, 10b), and the filter elements (3a, 3b, 3c) are held together exclusively by the fact that in each case the lower connecting section (10a) of one filter element (3a, 3b) is connected sealingly to the upper connecting section (10b) of another filter element (3b, 3c).

Description

The invention relates to a filter cartridge having the features in the preamble of claim 1.

It is known from the prior art, for example, to use filter columns with which a continuous desalination or demineralization of raw water can be realized with the aid of a filter medium in the form of ion exchange resins. DE 2 137 796 A1 proposes for this purpose, in a cylindrical tube downstream chambers for the anion exchange resin and separated by a tight-fitting bottom thereof to provide additional chambers for the cation exchange resin. For an exchange of the filter medium, however, it is necessary to empty the filter medium from the chambers and refilled, which has proven to be cumbersome and time-consuming, especially as there is a significant risk of contamination by fallen-off lonenaustauscher- resin in place.

DE 43 12 580 C1 describes a small water treatment plant, in particular for coffee machines, in which untreated water is fed to one or more ion exchange vessels via a non-pressurized feed and flows through it only on the basis of gravity. With a filling of the filter medium to 10 1 to 100 1 raw water can be processed. In practice, however, has shown that due to the slow flow rate of the raw water in the ion exchange container only a small water flow can be achieved, which can not be increased by a larger number of series-connected ion exchange containers. DE 40 35 563 A1 discloses a water treatment device consisting of a first and second chamber filled with ion exchange material, which are located in a lower housing portion and an upper housing portion. The raw water passes through a water inlet first in the lower chamber, from there via passages in the upper chamber and leaves it through a water outlet installed in a lid. The lower housing portion is bolted via a connecting rod with the upper housing portion, whereby the housing sections are braced against each other. The disadvantage of this known water treatment device lies in the fixed predetermined performance of the water treatment device, so that for each performance class specific upper and lower housing sections are vorzuhalten.

The invention was based on this situation based on the object to provide a filter cartridge which is variable in length and suburb can be used in predetermined, different lengths of filter chambers of a pressurized water treatment plant.

The object is achieved with the characterizing features of claim 1. During use, the filter cartridges are flowed through by raw water, which first enters through the filter cover into the interior, where it is treated by the filter medium enclosed therein and flows through flow openings in the bottom wall. During a filter change, the filter technician with different filter media ready-made filter elements are available, which are used due to their identical design in the intended combination or in new, adapted to the actual water quality combination as a filter cartridge in the filter housing. Due to the filter cup and filter Ckel encapsulated interior can leak during disassembly / assembly of the filter elements no filter medium and cause contamination.

A sealing connection is understood as meaning a connection which is dense under the operating conditions to be expected, that is to say preferably up to 6 bar, particularly preferably up to 10 bar, of water pressure.

The essential advantage of a connection of the filter elements over their upper and lower connecting portions is that the filter elements during assembly need only be successively inserted into the filter housing without additional connecting means. The connection of the filter elements is preferably a plug connection in the axial direction of the filter elements, whereby a tool-free to be mounted / dismantling and yet sealing mechanical connection of the filter elements is realized to a filter cartridge. The connection of the upper and lower connecting portion is preferably a frictional connection between these components.

Advantageously, the bottom wall is arranged on the lower connecting portion or part of the lower connecting portion.

Conveniently, the upper connecting portion has a circumferential upper wall portion and the lower connecting portion of the adjacent filter element is clampingly encompassed by the circumferential upper wall portion or engages around this. For a pressure-tight connection of the adjacent filter elements of the circumferential, upper wall portion is closed in the circumferential direction. The terms "encompassed" and "encompasses" make it clear that it is irrelevant to the invention whether the peripheral, upper wall portion with respect to the lower connecting portion in the radial direction outside or inside. By the term "clamping" is meant a connection in which the mobility of a component is prevented by adhesion. The holding force must be greater than the force acting on the component to be fastened force. According to a first preferred embodiment, the circumferential upper wall portion is arranged on the upper side of the filter cover and the filter cover is supported on an end face and / or an inner side and / or outer side of the peripheral wall. In this embodiment, the filter cover in addition to the function of a closure of the interior nor the additional function of a mechanical connection to the adjacent filter element. The upper wall portion protrudes in the axial direction with respect to the filter cover and is preferably aligned concentrically with the peripheral wall of the filter cup. According to a second preferred embodiment, the circumferential upper wall portion is formed from an inner side and / or outer side of the peripheral wall and the filter cover is also supported on the inner side between the circumferential upper wall portion and the bottom wall. In this alternative embodiment, the function of the filter cover is limited to the conclusion of the interior, so that leakage of the filter medium is effectively avoided during a change of the filter elements. The connection of the adjacent filter elements via the adjacent and overlapping in the axial direction peripheral walls. The advantage of this embodiment is that the filter cover need not be mounted pressure-tight relative to the filter cup, since this is completely in the interior and at this point no entry of raw water into the filter cartridge is possible.

Preferably, the lower connecting portion has a circumferential lower wall portion and in interconnected filter elements is the upper connecting portion of the adjacent filter element clampingly encompassed by the circumferential lower wall portion or engages around this. For tightness reasons, the circumferential, lower wall section should be closed in itself.

Advantageously, the circumferential lower wall portion is formed on the underside of the bottom wall. This embodiment makes it possible, in particular, to enclose the next, circumferential, upper wall section from the outside.

As an alternative to the lower side of the bottom wall, the circumferential lower wall section can also be formed from an outer side of the peripheral wall, which is then preferably enclosed from the outside by the nearest peripheral upper wall section.

Appropriately, the circumferential upper and lower wall portion on the same taper. The same conicity is understood to mean a parallel alignment of the mutually aligned and opposing peripheral upper and lower wall sections. The same conicity of the circumferential wall sections improves the tightness of the connected filter elements.

The filter cover can be clamped attached to the peripheral wall. This allows the filter element to be opened before assembly and filled up with the appropriate filter medium. Due to the clamp connection succeeds reopening after previous use without additional tools, since the clamping connection is relatively insensitive to deposits and contamination and can therefore be solved even after prolonged use. Conveniently, a sealing bottom element engages on the filter element arranged at the end. The base element preferably has a pot shape with an annular connecting wall and with a bottom closure wall closing the annular connection wall at the end. With the bottom element, the filter cartridge is supported in the axial direction with respect to the filter housing. The bottom element is sealingly connected to the nearest filter element in order to avoid an entry of raw water from outside the filter cartridge at this transition and, if a riser is provided, to allow entry of the pure water leaving the adjacent filter element into the riser.

Advantageously, the annular connecting wall of the bottom element and the lower connecting portion of the adjacent filter element is clampingly encompassed by the annular connecting wall or surrounds these from the outside. The annular connecting wall can preferably engage from the outside at the lower connecting portion, in particular the circumferential, lower wall portion. In principle, however, the annular connecting wall may also be located inside and surrounded by the lower connecting section located to the outside, in particular a circumferential lower section of the wall formed on the lower side of the bottom wall.

The annular connecting wall can have the same conicity as the respective lower connecting section abutting thereon, whereby centering of the components to be assembled filter element / bottom element simplified and a pressure-tight connection is achieved.

Preferably, the interior of the filter element is penetrated by a riser extending in the axial direction. By means of the riser, the pure water flows back after passing all filter elements and can be removed on the top of the filter cartridge. The riser is preferred example, constructed segment-like, each filter element is associated with a segment of the riser. In the axial course of the riser, there is no inflow of water; this occurs only in the area of the bottom element in the riser.

Advantageously, the riser is arranged centrally within the filter cup. As a result, the filter elements can be stacked in a particularly simple manner without having to time-align individual filter elements in the circumferential direction or provide them with an additional mounting aid.

Conveniently, the peripheral wall and / or the bottom wall and / or the riser are formed from a one-piece, integral unit. The term "integral" is understood to mean a structural unit which can not be dismantled into further individual parts without destruction.Preferably, this integral structural unit is made of plastic in order to prevent corrosion and to keep the manufacturing costs and mass low injection molding.

The riser can be passed through the bottom wall or molded onto the bottom wall, the second-mentioned embodiment being particularly suitable for the injection molding process.

Appropriately, a sleeve is formed at a first end of the riser. A sleeve is a component for the uninterrupted connection of two pipes or cables and the counterpart to the nipple. The nipple is in this case the riser of the adjacent filter element. Thus, the sleeve of the connection of the riser pipe of a first filter element with the riser pipe of an adjoining, second filter element is used. Particularly advantageous is an embodiment in which the sleeve is integrated in the bottom wall. As a result, the sleeve is held stationary relative to the associated filter element and the underlying end portion of the riser only needs to be inserted into the sleeve. For this purpose, the sleeve preferably has a larger inner diameter than the riser pipe, which sometimes can also taper conically for effective sealing.

Conveniently, a second, opposite the first end end of the riser tube to a length such that it pushes into the sleeve of the adjacent filter cup. It has proved to be particularly advantageous if the sleeve terminates with the underside of the bottom wall and the riser protrudes in the axial direction with respect to the peripheral wall. Alternatively, the sleeve may also protrude with respect to the bottom wall and the riser pipe may be recessed relative to the peripheral wall or terminate therewith. It is always essential that the sleeve and the riser pipe are inserted into one another in the assembled position of two adjacent filter elements in an overlapping manner.

According to a particularly advantageous embodiment of the filter cartridge of the upper connecting portion is formed from a molded on the filter cover lid pipe socket and the lower connecting portion of the adjacent filter element clamped encompassed by the cover pipe socket or surrounds this. In this embodiment, the raw water first flows through the successively arranged filter elements of the filter cartridge and exits at the last filter element in the flow direction as pure water. Preferably, the first flow opening is enclosed by the cover pipe neck, so that water can flow from the filter cover exclusively over the cover pipe neck. In an additional riser, which completely passes through the assembled filter cartridge inside in the axial direction, can be omitted in this embodiment. From this The advantage that the flow resistance is significantly lower and thus also the pressure loss is reduced. It is essential in this embodiment that the only non-positive connection between the adjacent filter elements simultaneously ensures a pressure-tight seal between raw water and pure water in the transition region of the adjacent filter elements.

Appropriately, the cover pipe socket protrudes in the installed position upwards relative to the filter cover. This facilitates a connection of the filter elements when they are used on site by a fitter in succession in a designated filter device.

It makes sense that the lower connecting portion is formed from a bottom pipe formed on the bottom wall. Preferably, the second flow opening is enclosed by the bottom pipe socket so that water from the bottom wall can flow exclusively through the floor pipe socket. The bottom pipe socket can be plugged into each other for joining the filter elements to a filter cartridge with the cover pipe socket overlapping. For this it is particularly advantageous if the floor pipe socket projecting in the installed position downwards relative to the bottom wall.

Preferably, the cover pipe socket and the floor pipe socket are aligned concentrically to the longitudinal axis of the filter elements. As a result, the filter elements can be connected in a particularly simple manner, regardless of their position in the circumferential direction, since the cover pipe sockets and bottom pipe sockets always face each other.

Conveniently, at least one sealing element is arranged between the cover pipe socket and floor pipe socket. A sealing element is understood to mean, for example, an O-ring, which seals off raw water and clean water. water even after repeated plugging and loosening of cover pipe socket and floor pipe socket particularly reliable.

In the embodiment in question, the circumferential wall can be shaped in particular cylindrically. In addition to a simple and cost-effective production of the filter elements, the cylindrical shape of the peripheral wall allows a maximum interior space for receiving the largest possible amount of a filter medium at a given inner diameter of a pot-shaped filter chamber of the filter device.

Advantageously, radially projecting centering cams are formed at one or both axial end portion (s) of the filter element with respect to the peripheral wall. When the filter elements are inserted into the pot-shaped filter chamber of the filter device, the centering cams ensure a centric alignment and facilitate the connection, in particular, of cover pipe sockets and floor pipe sockets. For example, due to the cam shape, already treated pure water may flow past the filter elements with little resistance outside, so that the pressure losses due to the presence of the centering cams are relatively low.

It has been found to be particularly useful if a plurality of downwardly projecting standing cam are formed on the bottom wall in the installed position. By way of the stationary cams, the filter element inserted first into the pot-shaped filter chamber is supported at the end, so that pure water emerging from the filter element can flow out in the radial direction to the filter cartridge and the pressure losses are thereby kept as low as possible. In order to provide only a single embodiment of the filter element, all filter elements on the stand cam, even if they are inoperative between adjacent filter elements. Preferably, the stand cams are distributed in the circumferential direction and arranged concentrically around the bottom pipe socket. Due to the distribution and spacing of the standing cams, there is a sufficiently large cross-section for the outflow, in particular of the pure water, which in turn helps to keep the pressure loss as low as possible.

In the embodiment in question, the filter cover can be sealingly connected to the filter cup, so that entry of raw water into the interior of the filter element is avoided, which is to be avoided especially in the flow direction remote filter elements, otherwise there is a contamination of completely or partially treated water.

For a simple stacking or unstacking of the filter cartridges may be formed on the peripheral wall and / or on the filter cover a handle device. This simplifies the positioning and alignment of the filter elements in a filter housing during assembly. After expiry of the operating time, the filter elements must be pulled out of the generally cylindrical and tight-fitting filter housing, the Filterelemen- te at least partially filled with water and are correspondingly heavy. A removal designed with a gripping the peripheral wall or the filter cover without additional handle device as extremely difficult.

The invention is also realized on a filter device with a filter housing and with a filter cartridge arranged therein, wherein the filter housing has a cup-shaped filter chamber and a filter chamber lid sealing this pressure-tight and through the filter chamber lid, a connecting piece and a pipe socket are passed. Under a connecting piece and a pipe socket is understood in each case a short, passing through the filter chamber cover piece of pipe. The connection- and / or pipe socket can also be provided with a flange connection. At the connection and / or pipe socket, for example, a water pipe can be connected, wherein advantageously the raw water flows in through the connecting piece and the pure water flows through the pipe socket. It is also possible to supply raw water through the pipe socket of the filter device and remove the pure water through the connection piece. In this case, the flow direction reverses within the filter elements.

The filter housing is usually mounted stationary in a building. After connecting the connecting piece with the water pipe, the filter housing is charged with raw water according to the applied line pressure.

Preferably, in the closed state of the filter chamber and the filter chamber cover, the connection piece is connected to a distribution element which distributes the inflowing raw water to the top of the nearest filter cover. As a distribution element can advantageously serve a hose that is loosely placed on the nearest filter cover. For a particularly uniform distribution of the inflowing raw water over the cross section of the filter cartridge, the hose can have a plurality of outlet openings arranged offset in the axial direction.

In the closed state of the filter chamber and the filter chamber cover, the pipe socket can be sealingly connected to the riser. This avoids that raw water is mixed with the already purified pure water.

According to a particularly preferred embodiment, the pipe socket is biased in the direction of the filter chamber in its axial direction variable length. Since the tolerances of the assembled filter elements add up and, in addition, the filter cartridge, including the assembled rocker When the cable is preloaded, the length-variable preloaded pipe socket ensures a corresponding compensation, which in turn increases the tightness. Conveniently, a free annular space remains between the filter cartridge and an inner wall of the filter chamber. This annulus fills during operation with raw water and contributes to the pressure relief of the filter elements, as in the annulus, the water pressure of the applied raw water prevails. This in turn effectively prevents inflation of the peripheral wall by the water pressure prevailing inside the respective filter element.

The size of the filter chamber can expediently always be such that a predetermined integer number of filter elements can be stacked on top of one another. Otherwise, the composite filter cartridge would be too short and a sealing of the filter elements with each other and with the bottom element not possible. If the desired water quality is achieved with fewer filter elements than are necessary for achieving the required length of the filter cartridge, filter elements without filter medium can also be used in the filter chamber, with the aim of achieving the filter cartridge required length of the filter cartridge.

According to a particular embodiment of the filter device, the filter chamber at the end has a filter chamber floor and spaced from the filter chamber floor, a bottom element in the form of a grid plate is arranged, on which the stand cam of the lowermost filter element are supported. The grid plate provides an abutment for the stand cam, but is passable especially for exiting from the filter element pure water, so that the flow resistance can be further reduced. For better understanding, the invention will be explained in more detail below with reference to ten figures. It show the

Fig. 1: a cross section through three stacked

Filter elements with attached filter caps according to a first embodiment;

2 shows a cross section through a filter cover according to

Fig. 1;

3 shows a cross section through a filter cup;

4 shows a cross section through a bottom element;

5 shows a cross section through a filter element according to a second embodiment with inserted into the filter cup filter cover. 6 shows a cross section through two filter elements according to a third embodiment, each with inserted into the filter cup filter cover.

7 shows a cross section through a filter device with filter housing and filter cartridge arranged therein according to the first embodiment in FIG. 1;

Fig. 8: a partially sectioned side view through a

Filter element according to a fourth embodiment; 9 shows a perspective side view of the filter element according to FIG. 8 with the handle device set up, and FIG. 10 shows a cross section through an alternative filter device with filter housing and filter cartridge arranged therein according to the fourth embodiment in FIG Each filter element 3a, 3b, 3c has a cup-shaped filter cup 4, which consists of a peripheral wall 5a and a bottom wall which closes the end side 5b is formed. In each interior 7 of the filter elements 3a, 3b, 3c is a filter medium 34, which may be identical or different in terms of its nature depending on the quality of the raw water and / or the claim to the pure water. In principle, it is also possible for one or more of the filter elements 3a, 3b, 3c not to be equipped with a filter medium 34 and to insert the respective filter element 3a, 3b, 3c merely as an empty placeholder into the filter cartridge 1 in order to remove the filter housing 2 (FIG. see Fig. 7) provided length of the filter cartridge 1 to achieve. In principle, the filter elements 3a, 3b, 3c used together are configured identically in order to produce and store as few as possible a single type of filter elements 3a, 3b, 3c.

Each filter cup 4 is closed with a filter cover 6, so that neither during transport of the filter elements 3a, 3b, 3c nor during operation or its Auswechseins the filter medium 34 can escape. According to the illustrated embodiment according to FIG. 1, the filter cover 6 is placed on a front side 13 (see FIG. 3) of the peripheral wall 5a and frictionally connected thereto. The filter cover 6 of the filter element 3b, 3c also assumes the function of an upper connecting portion 10b, by this enclosing a lower connecting portion 10a of the filter element arranged above it 3a, 3b. The filter cover 6 in isolation shows Fig. 2.

The upper connecting portion 10 b is formed from a circumferential, upper wall portion 14, which protrudes in a coronal manner against an upper side 1 1 of the filter cover 6 in the axial direction. An inner side 35 of the circumferential upper wall section 14 tapers in the direction of the inner space 7. The lower connecting portion 10 a is formed from a circumferential, lower wall portion 15 of the peripheral wall 5 a, which is preferably flared in the direction of the filter cover 6. The circumferential, lower wall portion 15 is frictionally inserted into the circumferential, upper wall portion 14, so that from this results in a pressure-tight, clamping connection. By pulling the circumferential wall sections 14, 15 apart in the axial direction, the respective filter elements 3a, 3b, 3c can be separated again for a disassembly.

In order to achieve the most accurate alignment and beyond pressure-tight connection of the filter elements 3a, 3b, 3c with each other, the conicity of the circumferential, lower wall portion 15 corresponds to the taper of the current, upper wall portion 14. The corresponding peripheral wall sections 14, 15 thus have an overlapping, sheet-like touch on.

During operation, the raw water to be treated first flows into the interior 7 through first flow openings 8 arranged in the filter cover 6 of the filter element 3a and leaves it again after passing through the filter medium 34 through second throughflow openings 9 formed in the bottom wall 5. From the second throughflow openings 9, the now single-stage treated water enters the first throughflow openings 8 of the nearest filter element 3b, flows through the associated interior space 7 and leaves the filter element 3b through the corresponding second flow openings 9 in the bottom wall 5b. Depending on the number of filter elements 3 a, 3 b, 3 c used, a corresponding number of filter stages can be installed in the filter cartridge 1.

The embodiment of the invention shown in FIG. 1 is used in conjunction with a riser 19 which is not particularly well visible in FIG. 1 and which can be seen particularly well in FIG. 7, which directs the water emerging from the filter element 3c back to a water inlet side 36 of the filter cartridge 1 , For this purpose, it is necessary that the filter cartridge 1 is closed at the end by means of a bottom element 17, which is fastened by clamping from the outside to the circumferential, lower wall section 15 of the filter element 3c.

For this purpose, the bottom element 17 has a cup shape with an annular connection wall 18 and a bottom closure wall 32 which terminates in a centric manner. The connection wall 18 extends complementary to the circumferential, lower wall portion 15 and is pushed onto the latter from the outside.

Fig. 3 shows further details of the filter cup 4 according to the embodiment shown in Fig. 1. On the peripheral wall 5a engages on opposite sides, adjacent to the end face 13, a handle device 23 in the form of a pivotable handle. With the aid of the gripping device 23, the filter elements 3a, 3b, 3c can be successively lowered into the filter housing 2 (see FIG. 7) and the filter elements 3a, 3b, 3c individually removed again as part of a change. Centrally within the filter cup 4, the riser 19 protrudes perpendicular to the bottom wall 5a in the direction of the end face 13 and is overlapped in the axial direction of the peripheral wall 5a. In the region of the bottom wall 5b, the riser 19 merges with its first end 20 into a sleeve 22, which in turn is firmly inserted into the bottom wall 5b. Preferably, the entire filter cup 4 is made with the peripheral wall 5a, the bottom wall 5b and the riser 19 together with sleeve 22 as a one-piece plastic part. FIG. 5 shows an alternative embodiment in which the filter cover 6 has been inserted centrally in the direction of the interior 7 and is supported laterally on an inner side 12 of the peripheral wall 5a. The filter cover 6 is frictionally inserted into the peripheral wall 5a, which does not necessarily have to be designed to be pressure-tight. The filter cover 6 serves only the purpose of keeping the filter medium (see Fig. 1) within the inner space 7, whereas the pressure-tight connection is realized against penetrating into the filter cartridge 1 raw water through the first lower and upper connecting portion 10 a, 10 b. In the present embodiment, the lower connecting portion 10a of the filter element 3a is formed of the circumferential, lower wall portion 15 of the peripheral wall 5a, which is inserted directly into the circumferential, upper wall portion 14 of the filter element 3b. The circumferential, upper wall portion 14 of the upper connecting portion 10b is defined by the inner side 12 in a region between the filter cover 6 and end face 13 of the peripheral wall 5a. The peripheral, upper wall portion 14 and the peripheral, lower wall portion 15 have the same conicity and are interconnected by a frictional clamping connection. FIG. 6 shows a further preferred embodiment with two filter elements 3a, 3b spaced one above the other, each having a lower connecting portion 10a which acts directly on the bottom wall 5b. The bottom wall 5b has for this purpose on its underside 16 in the direction of the adjacent filter element 3b projecting circumferential, lower wall portion 15, whose inner diameter is larger than the maximum outer diameter of the peripheral wall 5a of the filter element 3b.

Upon a further lowering of the filter element 3a to the filter element 3b located underneath, the circumferential, lower wall section 15 of the filter element 3a comes into operative connection with the circumferential, upper wall section 14 of the filter element 3b, which is formed from an outer side 31 of the peripheral wall 5a. At the same time, the sleeve 22 of the filter element 3a slides over a second end 21 of the riser 19 of the filter element 3b and thereby establishes a sealing connection.

In principle it is also possible, instead of the filter cover 6 supported on the inside 12 of the peripheral wall 5 a to provide a filter cover 6 attached to the end face 13 of the peripheral wall 5 according to the embodiment according to FIG. In such, not shown in this combination embodiment, the upper connecting portion 10b would be located exclusively on the filter cover 6 and the peripheral, upper wall portion 14 of the filter cover 6 would be either inserted into the formed on the bottom wall 5b circumferential lower wall portion 15 or would this from the outside enclose.

FIG. 7 illustrates in a cross section an operational combination of filter cartridge 1 and filter housing 2. The filter housing 2 has a cylindrical filter chamber 24 which is closed at the end and can be closed in a pressure-tight manner by means of a filter chamber cover 25. For this, the filter chamber Cover 25 against the filter chamber 24 via toggle screws 37 and located between the filter chamber cover 25 and filter chamber 24 O-ring seal 38 are clamped. In the filter chamber cover 25, a connecting piece 26 is eccentrically arranged, which is connected to a distribution element 27 in the form of a piece of hose and is fed via the raw water to the filter cartridge 1. For a uniform distribution of the raw water over the filter cartridge 1 and a high throughput, the distribution element 27 has a plurality of outlet openings 33 which are offset relative to one another in the axial direction.

The water flows through the filter cartridge 1 in the direction indicated by arrows flow path. In addition, the raw water emerging from the distribution element 27 also flows over the filter cover 6 and collects in an annular space 30 between the filter cartridge 1 and an inner wall 29 of the filter chamber 24. By means of this structural measure, approximately the same pressure prevails within the filter cartridge 1 as in the annular space 30 , so that the wall thickness of the filter elements 3a, 3b, 3c can be made smaller than if the entire water pressure would act exclusively on the inside of the filter elements 3a, 3b, 3c.

The raw water flows through successively first the filter elements 3a, 3b, 3c and from there into the bottom element 17. From the bottom element 17, the raw water treated to pure water enters the riser 19. In the embodiment shown, on the underside 16 of the bottom wall 5b of the filter element 3c projects the sleeve 22, which is an integral part of the riser 19 extending in the interior 7. At each filter element 3a, 3b, 3c, a riser 19 is arranged, so that when assembled filter cartridge 1, a segmented composite pipe train is formed. The riser 19 of the filter element 3a is the centrally and pressure-tight inserted into the filter chamber cover 25 pipe socket 28, which comes into engagement with the riser 19 when attaching the filter chamber cover 25 to the filter chamber 24 in sealing engagement. Through the pipe socket 28, the treated pure water can be supplied to a line network, not shown.

Fig. 8 shows a partially sectioned side view of a filter element 3a according to a further, fourth embodiment. The filter element 3a has a filter cup 4 with a cylindrical peripheral wall 5a, wherein the peripheral wall 5a forms an integrally integral structural unit with the bottom wall 5b arranged in the image plane at the lower end 42 of the peripheral wall 5a. At the end of the circumferential wall 5a opposite the bottom wall 5b in the longitudinal axis Y, the latter is in sealing connection with the filter cover 6. The filter cup 4 and the filter cover 6 together surround a likewise cylindrical interior space 7 in which a filter medium is enclosed in the state ready for installation ,

The filter cover 6 is pierced by a concentrically surrounding the longitudinal axis Y, the first flow opening 8. In this case, the first flow opening 8 is completely enclosed by a cover pipe socket 39 in the circumferential direction, which protrudes upward beyond the level of the top 1 1 of the filter cover 6 and down into the interior 7. The cover pipe socket 39 forms the upper connecting portion 10a to a further filter element 3b or a connecting piece 26 stackable thereon, via which raw water is fed onto an upper filter element 3a inserted into a filter housing 2 (see FIG. 10).

In the bottom wall 5b, a second flow opening 9 is also arranged concentrically about the longitudinal axis Y of the filter element 3a, via which the Water leaves the filter element 3a again. The second flow opening 9 is also surrounded by a closed in the circumferential direction bottom pipe socket 40. The bottom pipe socket 40 protrudes downwards relative to the underside 16 of the bottom wall 5b. The bottom pipe socket 40 represents the lower connecting portion 10 a.

In the assembled state of two filter elements 3a, 3b corresponding to FIG. 10, it can be seen how the lower connecting section 10a of the upper filter element 3a in the form of the bottom pipe socket 40 with the upper connecting section 10b of the lower filter element 3b in the form of the cover rstutzens 39th overlapping each other are pushed together. In the exemplary embodiments of FIGS. 8 to 10, the cover pipe socket 39 has a larger inner diameter than the outer diameter of the floor pipe socket 40, so that the floor pipe socket 40 is completely enclosed by the cover pipe socket 39 in the circumferential direction.

For a pressure-tight connection, a sealing element 41 is preferably arranged in the form of an O-ring between the cover pipe socket 39 and floor pipe socket 40. In the separated state of the filter elements 3a, 3b, 3c, the sealing element 41 is located on the outside of the bottom pipe stub 40. Due to the reversible deformability of the sealing element 41 is a fluid-tight and mechanically releasable connection of the cover pipe socket 39 with the bottom pipe socket 40. From the bottom 16 of the bottom wall 5b, a plurality of standing cams 44 protrude in front of the base pipe socket 40, which terminate at the end with the level of the bottom pipe socket 40. Between the stand cam 44 openings 44b are alternately formed, through which water can flow. The stand cam 44 are only relevant for the lower filter element 3b in FIG. 10, with which it is mounted on a floor element 17 in FIG Shape of a grid plate 46 is turned off. The grid plate 46 is disposed between a cylindrical portion of the filter chamber 24 and the concave arched filter chamber bottom 45. The stand cam 44 should be at least as long in the axial direction that they complete with the bottom pipe socket 40, otherwise the protruding on the grid plate 46 filter element 3b would wobble around its bottom pipe stub 40, whereby an accurate assembly of one or more filter elements 3a with the filter element 3b would be difficult to a filter cartridge 1. In the perspective side view of Fig. 9 are on both axial end portions 42 of the peripheral wall 5a in the radial direction projecting centering cam 43 can be seen, which are supported upon insertion of the filter elements 3a, 3b on the inner wall 29 of the filter chamber 24 (see Fig. 10) and thereby align the respective filter element 3a, 3b exactly in the radial direction of the filter chamber 24. Due to the arrangement of the centering cams 43 at both end portions 42 and the resulting maximum distance in the axial direction is an axis-parallel as possible alignment to the filter chamber 24. This in turn results in the advantage that the one or more cover tube 39 are particularly precisely opposite their associated bottom pipe socket 40 and they can be pushed together without tilting.

The set up in Fig. 9 handle device 23 is pivotally mounted on the filter cover 6 and can bring after insertion of the filter element 3a in a lowered position. For this purpose, the filter cover 6 has a handle recess 23a formed in a complementary manner to the handle device 23, into which the handle device 23 can dip. In the lowered position of the gripping device 23, this concludes flush with the top 1 1 of the filter cover 6 and does not hinder the intermeshing of cover pipe stub 39 and bottom pipe stub 40th In the illustration of FIG. 10, by way of example, two filter elements 3 a, 3 b as a filter cartridge 1 are inserted into the filter chamber 24 of a filter housing 2. In principle, it would also be possible, depending on the dimensioning of the filter chamber 24, to insert three or more filter elements 3a, 3b, 3c into the filter chamber 24.

The raw water is supplied to the filter housing 2 via the connecting piece 26 and passes via the first flow opening 8 into the interior 7 of the upper filter element 3a. For this purpose, the connecting piece 26 arranged centrally in the filter chamber recess 25 sealingly engages the upper connecting portion 10b, which is designed as a cover pipe socket 39. The interior 7 of the filter elements 3a, 3b flows through the raw water in the direction indicated by arrows flow direction, wherein it contacts with a filter medium, not shown. Via the second flow opening 9, the partially treated raw water leaves the filter element 3a, wherein the second flow opening 9 is channeled through the bottom pipe socket 40.

The bottom pipe socket 40 of the filter element 3a is inserted into the cover pipe socket 39 of the lower filter element 3b, which surrounds the first flow opening 8 of the lower filter element 3b. About the first flow opening 8 of the lower filter element 3b, the partially treated raw water flows into its interior 7, in which there is also a not shown filter medium, preferably with a different texture than in the interior 7 of the upper filter element 3a. By contacting with the filter medium of the lower filter element 3b, not shown, the partially treated raw water is treated to pure water, which leaves the lower filter element 3b via the bottom pipe socket 40.

Between the inner wall 29 of the filter chamber 24 and the respective outer side 31 of the circumferential wall 5 a of all filter elements 3 a, 3 b, an annular space 30 is provided. formed, through which the pure water flows in the direction indicated by arrows flow direction and is discharged via at least one introduced into the filter chamber cover 25 pipe socket 28.

LIST OF REFERENCE NUMBERS

1 filter cartridge

2 filter housings

3a-c filter element

4 filter cups

5a peripheral wall

5b bottom wall

6 filter cover

7 interior

8 first flow opening

9 second flow opening

10a lower connecting portion

10b upper connecting portion

1 1 top side filter cover

12 inside peripheral wall

13 front side peripheral wall

14 circumferential upper wall section

15 surrounding lower wall section

16 bottom bottom wall

17 floor element

18 annular connecting wall floor element

19 riser

20 first end riser

21 second end riser

22 sleeve

23 Handle device

23a Gripfrezess

24 filter chamber

25 filter chamber lid 26 connecting pieces

27 distribution element

28 pipe socket

29 inner wall filter chamber

30 annulus

31 outside peripheral wall

32 bottom closure wall floor element

33 outlets Raw water

34 filter medium

35 inside upper wall section

36 water inlet side

37 thumbscrews

38 O-ring seal

39 cover pipe socket

40 floor pipe sockets

41 sealing element

42 end portion peripheral wall

43 center cam

44 stand cams

44b breakthrough

45 filter chamber floor

46 grid plate

Longitudinal axis filter element

Claims

claims

Filter cartridge (1) for insertion into a filter housing (2) of a water treatment plant, wherein the filter cartridge (1) of a plurality, in the axial extension one behind the other filter elements (3a, 3b, 3c) is composed, each of a filter cup (4) and a Each filter cup (4) comprises a peripheral wall (5a) and a bottom wall (5b), in the interior (7) a filter medium can be introduced and in the filter cover (6) first and in the bottom wall (5b) second flow openings (8, 9) are provided,

characterized,

in that each filter element (3a, 3b, 3c) has a lower and upper connecting section (10a, 10b) and the filter elements (3a, 3b, 3c) are held together solely by the lower connecting section (10a) of a filter element (3a, 3b ) is sealingly connected to the upper connecting portion (10b) of another filter element (3b, 3c).

Filter cartridge (1) according to claim 1, characterized in that the upper connecting portion (10b) has a circumferential upper wall portion (14) and that the lower connecting portion (10a) of the adjacent filter element (3a, 3b) is clamped by the peripheral upper wall portion (14 ) is encompassed or encompasses this.

Filter cartridge (1) according to claim 1 or 2, characterized in that the lower connecting portion (10a) has a circumferential lower wall portion (15) and that the upper connecting portion (10b) of the adjacent filter element (3a, 3b) by clamping the circumferential lower wall portion (15) is encompassed or surrounds this.

Filter cartridge (1) according to claim 1, characterized in that the upper connecting portion (10b) of a formed on the filter cover (6) cover pipe socket (39) is formed and that the lower connecting portion (10a) of the adjacent filter element (3a) clamping of the Cover tube (39) is encompassed or surrounds this.

Filter cartridge (1) according to claim 4, characterized in that the cover pipe socket (39) protrudes in the installed position upwards relative to the filter cover (6).

Filter cartridge (1) according to claim 4 or 5, characterized in that the lower connecting portion (10a) is formed from an integrally formed on the bottom wall bottom pipe socket (40).

Filter cartridge (1) according to claim 6, characterized in that the bottom pipe socket (40) projects in installation position downwards relative to the bottom wall (5b).

Filter cartridge (1) according to claim 6 or 7, characterized in that the cover pipe socket (39) and the bottom pipe socket (40) concentrically to the longitudinal axis (Y) of the filter elements (3a, 3b, 3c) are aligned.

Filter cartridge (1) according to one of claims 6 to 8, characterized in that between the cover pipe socket (39) and bottom pipe socket (40) at least one sealing element (41) is arranged.

10. Filter cartridge (1) according to one of claims 4 to 9, characterized in that the peripheral wall (5 a) is formed cylindrically.

1 1. Filter cartridge (1) according to one of claims 4 to 10, characterized in that at one or both axial end portion (s) (42) of the filter element (3a, 3b, 3c) with respect to the peripheral wall (5a) formed radially projecting centering cams (43) are.

12. Filter cartridge (1) according to one of claims 4 to 1 1, characterized in that on the bottom wall (5b) in the installed position a plurality of downwardly projecting stand cam (44) are formed.

13. Filter cartridge (1) according to claim 12, characterized in that the stand cam (44) distributed in the circumferential direction and are arranged concentrically around the bottom pipe socket (40).

14. Filter cartridge (1) according to one of claims 1 to 13, characterized in that the filter cover (6) is sealingly connected to the filter cup (4).

15. Filter cartridge (1) according to one of claims 1 to 14, characterized in that on the peripheral wall (5 a) and / or on the filter cover (6), a grip device (23) is formed.

16. Filter device with a filter housing (2) and with therein a filter cartridge (1) according to one of claims 1 to 15, wherein the filter housing (2) has a cup-shaped filter chamber (24) and a pressure-tightly closing this filter chamber cover (25) characterized in in that through the filter canister cover (25) a connecting piece (26) and a pipe socket (28) are passed.

17. Filter device according to claim 16, characterized in that in the closed state of the filter chamber (24) and filter chamber cover (25) of the pipe socket (28) is sealingly connected to the riser (19).

18. Filter device according to claim 16 or 17, characterized in that between the filter cartridge (1) and an inner wall (29) of the filter chamber (24) a free annular space (30) remains.

19. Filter device according to one of claims 16 to 18, characterized in that the filter chamber (24) end a filter chamber bottom (45) and spaced from the filter chamber bottom (45) has a bottom element (17) in the form of a grid plate (46) is arranged on which the stand cam (44) of the lowermost filter element (3c) are supported.