Fluid filter and housing for a fluid filter

Abstract

A fluid filter cartridge (1) comprising at least: a filter element (50) forming a fluid channel (52) having a longitudinal axis (2); a front end cap (40) sealingly attached to a front side of the filter element (50); a rear end cap (60) sealingly attached to a rear side of the filter element (50); a through hole (42) located in the front end cover (40); a conduit (30) formed by a conduit wall (32), where the conduit wall (32) is attached to the front end cap (40) and the conduit is in fluid communication with the fluid channel (52) via a through-hole (42) in the front end cap (40), and where the conduit has a front end (34) facing away from the rear end cap (60), and n pins (20i, 3 < = i < = n) extending from an inner surface of the conduit wall (32) at an azimuthal position (I), wherein the pins 20i each have a front-facing surface facing away from the rear end cap (60), and wherein the pins 20i are spaced apart from each other by a distance (II) in the azimuthal direction, and wherein the nth pin 20n is azimuthally adjacent to the first pin 201, and wherein (III) is an azimuthal span of the ith pin 20i that varies with the respective azimuthal position # imgabs0 # of the ith pin 20i, if the distance di between the forward facing surface 24i and the reference plane (12) increases [Delta] di when from the first pin 201 towards the nth pin 20n, and increases by a value IV when from the nth pin 20n towards the first pin 201, the ith pin 20i can be manufactured cost-effectively while enabling azimuthally positioning the fluid filter cartridge on the fluid filter socket; wherein the reference plane (12) is perpendicular to the longitudinal axis 2 and is located at the front side or the rear side of all the n pins 20i, and alpha is an error range, i.e. Alpha belongs to {0.25, 0.2, 0.15, 0.1, 0.05, 0.025, 0.01, 0}. (I) from # imgabs1 # to # imgabs2 # (II) to # imgabs3 # (III) to # imgabs4 # (IV) to # imgabs5 #

Description

Technical Field

[0001] The present invention relates to components such as fluid filter housings, and to fluid filter cartridges, wherein the fluid filter cartridge is preferably configured to be mounted in a fluid filter housing. In another example, the present invention relates to components of an ion exchange cartridge and to components of a housing for an ion exchange cartridge. In general, the present invention relates to components of a fluid treatment system having a cartridge and a housing for accommodating the cartridge. At least one of the fluid treatment cartridge and the housing has a first cylindrical surface, and the corresponding other of the fluid treatment cartridge and the fluid filter housing has a second cylindrical surface. The first cylindrical surface and the second cylindrical surface may be surfaces of a conduit and / or a tube, respectively. The conduit may be a conduit of the fluid treatment cartridge, and the tube may be a tube of the fluid treatment housing, or the conduit may be a conduit of the fluid treatment housing, and the tube may be a tube of the fluid treatment cartridge. In addition, the present invention relates to a method for installing a fluid treatment filter element into a housing, and to a kit comprising at least one of the above-mentioned items, such as a fluid filter housing, a fluid filter element, an ion exchange filter element, a housing for an ion exchange filter element, a fluid treatment filter element, a housing for a fluid treatment filter element, a first cylindrical surface, a second cylindrical surface, a conduit and at least one of a tube. Background Art

[0002] EP 2956225 B1 proposes a filter element, wherein the filter element is located between the front cover and the rear cover. The filter element forms a fluid channel, which is protected from collapse by a support structure inside the fluid channel. The front cover has a through hole, which enables the fluid channel to be in fluid communication with the inlet pipe of the fluid filter socket. The filter element allows unfiltered fluid to flow radially inward through the filter element, and the unfiltered fluid is filtered when flowing through the filter element. The filtered fluid flows through the fluid channel and the through hole and flows out from the filter element. On the side of the front cover facing the rear end is a cylindrical ring, which is integrated with the support structure and aligned with the through hole and the filter element. Two pins protrude radially from the inner surface of the ring toward the ring axis. The two pins each have a surface facing forward, and the two surfaces facing forward are both located in a first plane. In addition, the two pins each have a surface facing the rear cover, and the two surfaces facing the rear cover are both located in a second plane. Both planes are perpendicular to the ring axis. The socket of the housing has a pipe, which has a free distal end for inserting into the ring of the filter element. The end surface of the tube facing the rear end cap has two recesses. Between the two recesses is a spiral surface portion configured to support the rotation of the filter element around the axis of the tube until the pin engages with the corresponding recess of the pin in the frontal surface of the tube facing the rear end cap.

[0003] WO 02 / 13944A2 proposes a keyed filter cartridge configured to be received by a filter cartridge holder. The filter cartridge has a top portion having a peripheral surface protrusion configured to engage in a mating recess of the filter cartridge holder.

[0004] US2017 / 0361252A1 discloses a hollow filter element for a fluid filter. Associated with the filter element is a holding device / following device of a holding system / following system, which holds the filter element in the first housing portion of the filter housing during installation of the filter element in the second housing portion and removal from the second housing portion by rotational movement and insertion movement, respectively. The holding device / following device associated with the filter element has a holding portion / following portion extending radially and circumferentially, and has a through hole extending circumferentially adjacent to the holding portion / following portion so that the holding portion / following portion of the holding system / following system associated with the filter housing can pass axially.

[0005] US2017 / 0187050A1 proposes a deionizing filter element for fuel cell applications. The filter element has an enclosure and a deionizing agent contained in the enclosure. The deionizing filter element can be connected to or connected to a cooling circuit via an inlet and an outlet with the help of a single connection unit in a fluid-transfer manner. Summary of the invention

[0006] The problem to be solved by the present invention is to provide a first article and a second article that are simple and therefore inexpensive to manufacture, while being configured to be mounted to each other in a predetermined azimuthal orientation. Another problem solved is to provide a fluid treatment filter cartridge and a housing for a fluid treatment filter cartridge that are also simple to manufacture and configured to receive the fluid treatment filter cartridge in a predetermined azimuthal orientation.

[0007] The solution to the problem is a first article as defined by claim 1. The subject of the dependent claims is an advantageous embodiment. The first article has a first cylindrical surface and is thus a catheter-like structure (catheter for short). The first cylindrical surface of the catheter-like structure may be the peripheral surface of the article. Thus, the catheter is not necessarily hollow, but it may be hollow. Alternatively, the cylindrical surface may delimit a hollow space of the article, in which case the catheter is hollow and may preferably have at least one open front end. The other end may be open or closed. In the case where the first surface delimits a hollow space, there is no restriction on the shape of the peripheral surface, it may be designed to meet any requirements, which may be technical requirements and / or aesthetic requirements. Therefore, the term "catheter" or "catheter-like structure" is a synonym for "first article having a first cylindrical surface", in the sense that the article resembles a straight catheter, and we use the term "catheter" only for simplicity and because "catheter" is more vivid than "first article having a first cylindrical surface". In this sense, "conduit" may be seen as an alternative to "first object having a first cylindrical surface", whether this surface is the peripheral surface or the surface facing the longitudinal axis of the conduit.

[0008] As will be explained in more detail below, the conduit of any one of claims 1 to 5 and the tube of any one of claims 6 to 10 can be mounted to each other. The tube and / or conduit can be integrated into and / or included in the fluid treatment filter element of claim 11 or 12 and / or in the housing for the fluid filter element of claim 13. The fluid treatment filter element of the example is a fluid filter element and an ion exchange filter element. The corresponding housing is therefore a fluid filter housing and an ion exchange filter element housing. Throughout the specification, as the term "conduit" can be replaced by "a first object", the term "tube" herein can be replaced by "a second object having a second cylindrical surface". In this sense, the conduit and the tube are each a substitute for the corresponding superordinate term. These objects are not necessarily hollow, or are not necessarily fluid-tight, or are not necessarily configured to enable fluid to flow, but as the use of the terms "conduit" and "tube" implies, the conduit and / or tube can be hollow, or fluid-tight, or configured to enable fluid to flow. These terms are simply more vivid than the corresponding superordinate terms they represent.

[0009] The fluid treatment filter element can have a fluid channel having a longitudinal axis. In the example of a fluid filter element, the fluid filter element can have a filter element forming a fluid channel having a longitudinal axis. These filter elements are well known and are made of porous materials so that fluid molecules can pass through the filter element, while particles larger than a given size are blocked. These filter elements are widely used and available on the market, and are usually made of folded filter paper. The front end cover and the rear end cover can be attached to the front side and the rear side of the filter element in a sealing manner, respectively. The filtered fluid can thus pass through the filter element between the front end cover and the rear end cover, for example, radially inwardly (entering the fluid channel from the outside). The filtered fluid can leave the fluid channel via at least one through hole in the front end cover and / or the rear end cover.

[0010] In an example, the conduit can have a conduit wall having a first cylindrical surface surrounding a through hole of the conduit. The conduit wall can, for example, be attached to a front end cap and can be in fluid communication with the fluid channel via the through hole in the front end cap. Therefore, the conduit can have a front end facing away from the rear end cap, and the rear end of the conduit can face the rear end cap. Therefore, the filtered oil (as an example of processed fluid herein) can flow from the fluid channel through the through hole of the conduit to any place where oil is needed.

[0011] In the example of an ion exchange filter element, the fluid channel can be provided by a first object, such as a conduit. At least a portion of the volume of the fluid channel can be filled with particles, which include ion exchange resin. Screens located at the front and / or rear ends of the fluid channel can ensure that the ion exchange resin is not flushed out of the fluid channel by the fluid flow through the fluid channel.

[0012] In any example application, the catheter has n pins attached thereto, n being an integer greater than 4 and / or greater than 5 and / or greater than 6 and / or greater than 8 and / or greater than 10. These n pins may each extend from the inner surface of the catheter wall toward the catheter axis and / or extend from the outer peripheral surface of the catheter wall away from the catheter axis. Each of these pins spans an azimuth angle Also referred to in this article as the azimuth span The subscript i identifies the pin, i.e. 1≤i≤n. For example, is the azimuth span of the first pin, is the azimuth span of the second pin, and so on. In summary, represents the azimuth span of the i-th pin.

[0013] Azimuth span can be considered as the azimuthal extension. In other words, the azimuthal span of the catheter rotation around the longitudinal axis of the catheter will move the first azimuth boundary of the i-th pin to the azimuth position of another azimuth boundary before the rotation of the same i-th pin. Thus, before rotation, each i-th pin extends ( "spans") in the azimuth direction from the first azimuth position to the second azimuth position Again, it should be noted that the subscript i represents the number of the corresponding pin, i.e., 1 ≤ i ≤ n. In this article, we assume that the pins are numbered in ascending order in the azimuth direction. Thus, for all 1 ≤ i < n, the i-th pin is the azimuth neighbor of the (i + 1)-th pin, and the n-th pin is the azimuth neighbor of the first (i = 1) pin (and of course the azimuth neighbor of the (n - 1)-th pin). The azimuth distance between two pins i, i′ is called Thus, the azimuth position of the (i + 1)-th pin is given by It goes without saying that the azimuth position of the first pin is Of course, every full turn, 360° = 2π needs to be subtracted, i.e., assuming then

[0014] As is usual in the field of mechanical engineering, the azimuth distance is the distance between two points in the azimuth direction, and the distance between the two points in the azimuth direction can be easily determined as the difference in the azimuth components of the coordinates of the two points (assuming cylindrical coordinates).

[0015] In a preferred example a is a constant, and α a is an error range selected from the set A, where A = {0.25, 0.2, 0.15, 0.1, 0.05, 0.025, 0.01, 0}, i.e., α a ∈ A, and α a is preferably small, and particularly preferably α a = 0. Additionally or alternatively b is a constant, α b ∈ A, preferably α b ≤ 0.1, and particularly preferably α b = 0. Again, as is usual in the field of mechanical engineering, x = y ± δ is an abbreviated form of |y| - |δ| ≤ |x| ≤ |y| + |δ|, and thus means Or in other words, within the relative error range of ±a b inside is equal to b, which can be said

[0016] Particularly preferably, the azimuth span and the azimuth distance have at least approximately the same size, and thus preferably, and wherein the smaller is preferred.

[0017] Each of the n pins has a forward-facing surface, i.e., the surface facing away from the rear end cover. Preferably, for all 1 < i ≤ n, as the respective azimuthal position changes, the distance d in the axial direction between the forward-facing surface and the reference plane i , when going from the (i - 1)-th pin to each i-th pin, increases or decreases by Δd i-1,i . Thus, d i+1 = d i +(1 ± α d )·Δd i,i+1 , Δd i,i+1 ≠ 0, and α d ∈ A, where Δd i := Δd i-1,i . And Δd1 := Δd n,1 . The increase in the axial distance d i means that Δd i,i+1 > 0, and correspondingly, the decrease in the axial distance d i means that Δd i,i+1 < 0. Thus, the distance d i increases or decreases strictly monotonically according to the azimuthal position . Merely for the sake of simple reference and for the purpose of explaining the concept, Δd i,i′ is the distance between the forward-facing surface of the i-th pin and the forward-facing surface of the i'-th pin, where 1 < i ≤ n and 1 < i' ≤ n, i.e., the distance Δd in the axial direction between the forward-facing surface of the n-th pin and the forward-facing surface of the first pin n,1 is preferably given by α dn ∈ A, where the smaller α dn is preferred.

[0018] The reference plane is perpendicular to the longitudinal axis and is preferably located at the front side or the rear side of all n pins. The axial position of the reference plane is chosen only for conceptual simplicity. In general, the reference plane can also be located between the first pin and the n-th pin, but when transitioning the reference plane, the meaning of the signs indicating the direction of the distance d i and the axial offset Δd i,i+1 changes. As has been apparent, αdn is the error range, and α dn is an element that can be selected from the set A = {0.25, 0.2, 0.15, 0.1, 0.05, 0.025, 0.01, 0}, i.e., α ∈ A. The symbol "±" as usual means that Δd1 is between and so that this axial offset Δd i has the following effect, i.e., the fluid handling filter element can rotate relative to the tube when moving in the forward direction until the first pin or the nth pin (depending on the sign of Δd n ) abuts against the protrusions on the outer peripheral surface and / or the inner surface of the tube in the azimuthal direction. The tube extends at least partially in the conduit or the conduit extends at least partially in the tube. However, rotation in the opposite direction is blocked. Thus, when installing the tube and the conduit by inserting one of the tube and the conduit into the other, they can rotate towards a predetermined azimuthal orientation but cannot rotate in the opposite direction. This simplifies the installation of components that require a predetermined azimuthal orientation, such as filter elements. In an example of a filter element with a front end cap, the front end cap has a conduit. Since the front end cap including the conduit can be manufactured by injection molding without using an additional slider in the mold, the manufacture of the conduit and thus the manufacture of the front end cap are greatly simplified. In addition, the installation of the fluid handling filter element is error-proof because if the fluid handling filter element is not rotated to the predetermined position, the fluid handling filter element will prevent the fluid handling housing from closing completely.

[0019] As is already apparent from the above, if the tube is at least partially inserted into the conduit or the conduit is at least partially inserted into the tube, the pins and the protrusions preferably extend at least substantially in opposite directions from the opposite surfaces of the conduit and the tube towards their respective counterparts. For example, if the conduit is configured to receive the tube, the pins can extend at least substantially radially inward from the inner surface of the conduit wall. In another example, the conduit can be configured to be at least partially received by the tube, and in this other example, the pins can extend at least substantially radially outward from the outer peripheral surface of the conduit wall. Similarly, if the tube is configured to receive at least a portion of the conduit, the protrusions preferably extend at least substantially towards the tube axis from the inside of the tube wall. If the tube is configured to be at least partially received by the conduit, the protrusions are preferably located on the outer peripheral surface of the tube and extend at least substantially radially outward.

[0020] In a preferred example, the azimuthal distance between the nth pin and the first pin is greater than (>) the maximum azimuthal distance between any other pair of adjacent pins i, i + 1, 1 ≤ i < n Thus, Thus, it can be ensured that the catheter can only be advanced further towards the tube in a predetermined azimuthal orientation. This is further enhanced if the optional complementary protrusion that blocks further rotation has an azimuthal span The azimuth span Greater than and less than It can be said that during the rotation, provided that the catheter is attached to the front end cap or integrated in the front end cap, the pin can slide beyond the surface of the projection facing the rear end cap.

[0021] This sliding is enhanced if at least a portion of the surface of the pin facing the front end is inclined in the azimuthal direction. The inclination preferably has a slope where α s ∈A, particularly preferably α s =0.

[0022] As already apparent, the pin has a side surface facing two opposite azimuthal directions. Preferably, the first pin and the nth pin each have an azimuthal abutment, wherein the two abutments face each other. These abutments can, for example, be formed by at least a portion of the opposing side surfaces of the two respective pins. These abutments enable the centering of a projection having an azimuthal span less than or equal to the azimuthal distance between the two pins, as will be explained in more detail below. The projection can, for example, be located on the outer peripheral surface of a tube configured to be inserted into a catheter, as described above.

[0023] In a preferred example, except for the distance between the last pin (nth pin) and the first (i=1) pin, for all pins, the axial distance Δd between the i-th pin and the (i+1)-th pin is i is at least substantially constant (within a relative error range α c Inside, α c ∈A). More concisely, this can be restated as Δd i =(1±α c )·c d , c d is a constant.

[0024] Another aspect of the invention is a tube of a fluid handling socket to which a fluid handling cartridge, such as a filter cartridge having at least one of the above-mentioned features, can be attached. In practice, these fluid handling sockets are usually part of a fluid handling housing, and these fluid handling sockets can even be integrated in a fluid handling housing for a fluid handling cartridge, in particular a filter cartridge as described above.

[0025] The fluid handling housing has a housing bottom and a housing cover. The housing cover is preferably removably attached to the bottom. The housing cover and the housing bottom enclose a space that is configured to receive a filter cartridge. In practice, the fluid handling housing can be opened, a previously inserted fluid handling cartridge can be removed (if present), another fluid handling cartridge or the same fluid handling cartridge can be inserted, and then the housing cover can be closed again. As indicated, the removal step is optional, for example, if the filter housing is already empty, then this step must be omitted.

[0026] The fluid handling socket can be located inside the fluid handling housing and can have a tube having a free end. The tube has an outer peripheral surface and a fluid opening, which is configured to receive fluid from the fluid handling filter element. Of course, the fluid flow can be reversed. Herein, only for a more vivid demonstration, we assume that the fluid flows through the filter element, enters the fluid channel, and then flows from the fluid channel to the fluid inlet of the tube. If the fluid flow is reversed, the fluid inlet becomes a fluid outlet. Therefore, the term "fluid inlet" is just a vivid example of the term "fluid opening", and the latter term "fluid opening" keeps the flow direction open.

[0027] The tube has a tube axis and has at least one first protrusion extending from the outer peripheral surface in an outward direction or at least one first protrusion extending from the inner surface at least substantially towards the tube axis. As has become apparent from the above, the tube can also be used in other applications, and the described integration of the tube into a fluid treatment housing, such as a fluid filter housing, is only an example of a practical application of the invention.

[0028] The first protrusion may have an azimuthal span and the surface facing the rear end of the corresponding conduit. In a preferred example, for all i+1≤n, the azimuth span Greater than or equal to (≥) the azimuth distance between the pins of the catheter And, the azimuth span is less than (or equal to) the azimuth distance between the nth pin and the first pin, i.e. Therefore, the first protrusion is only adapted in the azimuthal spacing between the nth pin and the first pin of the catheter. The axial dimension of the protrusion is preferably configured to abut against two mutually opposite azimuthal surfaces of the nth pin and the first pin. Therefore, the axial dimension l1 (also referred to as the first length l1) of the first protrusion is preferably at |Δd n,1 |, where "in the order of..." can be understood as (1-α l )·|d n,1 |≤l1≤(1+α a )·|Δd n,1 |, or in short l1=(1±α l)·|Δd n,1 |, where α l ∈A.

[0029] In a particularly preferred example, the first length l1 is greater than |Δd , depending on which of the first pin or the nth pin is farther from the rear end. n,1 | Subtract the axial length of the first pin or the nth pin, that is, subtract the axial length of the pin farther from the rear end cover. f is the axial length of the pin farther from the rear end of the two pins, then l1 preferably follows l1>|Δd n,1 |-l f , or preferably at least follows l1≥|Δd n,1 |-l f .

[0030] Preferably, the tube has (m-1) further projections which project from the outer peripheral surface of the tube and / or from the inner surface of the tube, wherein all projections have a set of associated azimuth angles And, in the case where the tube axis and the catheter axis are aligned, and the tube and catheter are oriented to follow the condition In the case of In other words, if the first protrusion is also counted, there are m protrusions, and the azimuth span of each of these protrusions is and their positions φ j is selected to ensure that the cartridge can travel if (or only if) the space between the nth pin and the first pin is azimuthally positioned to match the azimuth position of the first protrusion. j can be considered as a code that must be matched by the azimuthal position and azimuthal span of the pin. As already apparent, the subscript j indicates the jth projection associated with the value (range, position span, etc.).

[0031] Particularly preferably, the distally facing surfaces of the projections, ie the surfaces facing the rear end of the catheter (if the tube is installed), each have a position a distance δ from the reference plane. j and the slope of the protrusion s t , where s t , At least substantially (i.e., in percentage α st ∈A) is the slope of the catheter pin s c , Or in short (1±α st )·s p =s c .

[0032] There may be a second reference plane, the second reference plane being orthogonal to the tube axis. Thus, if the conduit and / or fluid treatment cartridge is attached to the tube and / or the spigot, the first reference plane and the second reference plane may be oriented to be at least substantially parallel to each other (this may include the two planes becoming identical when the fluid treatment cartridge reaches its axial end position). At least substantially parallel means that parallelism is preferred, but small deviations may be acceptable, for example deviations of less than 15°, less than 10°, less than 5°, less than 2.5° or less than 1° may be acceptable.

[0033] Particularly preferably, the axial positions of the distally facing surfaces of the projections are spaced apart from one another such that if the condition At least two distally facing surfaces each abut at least the forwardly facing surface of the pin. Thus, during adjustment of the azimuthal orientation of the fluid treatment cartridge, the longitudinal axis of the conduit can be at least substantially aligned with the tube axis, thereby reducing the risk of the pin and projection becoming stuck, which could result in preventing the fluid treatment cartridge from being properly oriented and / or axially advancing toward a predetermined position of the fluid treatment cartridge.

[0034] As is already apparent, the fluid treatment housing and the fluid treatment filter element may be combined together to form a fluid treatment system. A corresponding method may include at least one of the following steps:

[0035] - inserting the free end of the tube into the fluid channel of the fluid treatment filter element through the through hole;

[0036] - pushing the front end of the tube towards the fluid handling socket until at least one of the pins abuts with its forwardly facing surface against the distally facing surface of the projection;

[0037] - While pushing the front end towards the socket, the fluid treatment filter element can be rotated until further rotation is blocked.

[0038] The housing cover may then be closed. Prior to the inserting step, the housing cover may be removed or opened if necessary, and the installed fluid treatment cartridge, if installed, removed.

[0039] Once further rotation of the filter element is blocked, the filter element may be pushed axially until the filter element abuts the axial stop.

[0040] In the above, the invention has been described assuming that the pin is located on the surface of the conduit and the protrusion is located on the surface of the tube. But the pin can also be located on the surface of the tube and the protrusion is located on the surface of the conduit facing the pin. The interaction of the pin and the protrusion does not change. The terms "first surface of the conduit" and "second surface of the tube" are only chosen to be able to verbally distinguish these preferably cylindrical surfaces.

[0041] As usual, a cylindrical surface is a surface similar to a cylinder surface. Generally, it can be said that a cylindrical surface is at least partially consistent with at least a portion of a cylinder surface. In addition, it should be noted that it is preferred but not required that the cylinder surface herein is a cylindrical surface, i.e. at least a portion of the corresponding cylindrical surface is consistent with at least a portion of the cylindrical surface. For the generally accepted definition of a cylinder, see Handbook of Mathematics, Bronshtein, SemendyayevMusio, and Muehlig, 5th edition, Springer Berlin Heidelberg New York, 2007; ISBN 978-3-540-72121-5, Chapter 3.3.4 therein (page 154 and thereafter).

[0042] It should be noted that the present invention has been described with reference to its use in fluid filter cartridges and / or housings for fluid filter cartridges and with reference to its use in ion exchange cartridges and housings for ion exchange cartridges. However, the present invention is not limited to these applications. These examples of both belong to the general terms of fluid treatment cartridges and housings for fluid treatment cartridges, respectively. Therefore, more specific terms in this specification may be replaced by their corresponding generalizations. Features that are only required in specific applications (such as filter elements, end caps, ion exchange resins including particles, etc.) may of course be omitted. For simplicity only, the term "fluid treatment housing" is herein equivalent to "housing for a fluid treatment cartridge", or if a fluid treatment cartridge has been inserted, to "housing for a fluid treatment cartridge". BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Hereinafter, the present invention will be described by way of example with reference to the accompanying drawings, without limiting the general inventive concept, by way of example only.

[0044] Figure 1 shows a cross-sectional view of a filter cartridge having a conduit;

[0045] Figure 2 A cross section of a conduit of a filter element is shown;

[0046] Figure 3 Shows Figure 2 Front view of the catheter;

[0047] FIG. 4A to FIG. 4E The tube of the filter housing is shown interacting with the pins of the filter element;

[0048] Figure 5 An example of a fluid treatment filter element in the form of an ion exchange filter element is shown in perspective view;

[0049] Figure 6 Shows Figure 5 A bottom view of a fluid handling filter element in FIG.

[0050] Figure 7 Shows Figure 6 Details marked in Z;

[0051] Figure 8 A cross-sectional view of a fluid treatment cartridge in the form of an ion exchange cartridge within a fluid treatment housing is shown. DETAILED DESCRIPTION

[0052] Figure 1 The filter element 1 in the embodiment of the present invention comprises a filter element 50, which surrounds a fluid channel 52 having a longitudinal axis 2. Herein, the longitudinal axis is regarded as the filter axis 2. For example, the filter element 50 can be made of a folded filter paper, such as is commonly used for oil filter elements, or made of any other suitable filter material. The filter element 50 has a rear end side surface, which is attached to the front-facing surface of the rear end cover 60. The front side of the rear end cover 60 that is away from the front end side surface is correspondingly referred to as the rear-facing side surface 66 of the rear end cover 60. In this example, the rear end cover 60 is represented by a simple disk, but it can also have a through hole, a valve, an attachment device or the like, as known in the art. The front end side surface of the filter element 60 is attached to the rear-facing side surface 46 of the front end cover 40. The front end cover 40 has a through hole 42, which enables the filtered fluid to leave the fluid channel 52. The conduit 30 defined by the conduit wall 32 is attached to the front end cover 40 and surrounds the through hole 42. In other words, the inner surface 37 of the conduit defines the through hole 42. Similar to the front end cap 40 , the conduit 30 has a forward facing surface 34 and a rearward facing surface 36 .

[0053] At this point it should be noted that in this example the tube axis 2 and the filter axis 2 coincide, but this is not necessarily the case, as explained in detail in EP 3 249 184, and in the depicted example this alignment has been chosen merely for conceptual simplicity.

[0054] n pins 201, 202, 203, ..., 20 i ,…,20 n The inner surface 37 of the duct wall 32 may protrude into the free space enclosed by the duct wall 32 (see also Figure 2 and Figure 3 ). Each pin 20 i (1≤i≤n) with a forward-facing surface 24 i , and has a surface 26 facing the rear end at its opposite side i As shown in the figure, two adjacent pins 20 i and 20 i+1 The front-facing surface 24i ,twenty four i+1 Separated by a distance Δd i (See Figure 2 ). Therefore, the front-facing surface 24 i The distance d relative to the reference plane 12 i As the index i increases, it decreases. Typically, the reference plane can be placed at pin 20 i The other side, in this case, is the distance d i The location of the reference plane is irrelevant, but whatever is chosen, assuming the first pin is the pin closest to the front end of the catheter or the pin closest to the rear end of the catheter, the distances should all increase or all decrease as i increases from 1 to n.

[0055] In addition, if Figure 2 and Figure 3 As shown, pin 20 i Being azimuthally spaced apart, the conduits 30 are viewed from the front and aligned with the longitudinal axis 2 . is the angle at which the first protrusion (i=1) begins. The first protrusion 201 then extends or spans a “span” in azimuth In azimuth distance After that, at the angle At , the next pin 202 protrudes from the inner surface 37 of the conduit wall 32. In summary, at each azimuthal position , extending outwards with an azimuthal thickness (“span”) Pin 20 i In this example, in a clockwise direction, the pin 20 i Pinned 20 i+1 Follow, (but of course, the direction can be reversed), and the i-th pin 20 i and the subsequent (i+1)th pin 20 i+1 The azimuth spacing (azimuth gap) between Therefore, the (i+1)th pin is 'begins' (or ends, depending on the preferred direction) at Figure 3 As shown, Than all Preferably, Nth Pin 20 n The azimuth gap between the first pin 201 Ensure that when inserting the conduit (which may be part of the filter element 1), the conduit can be inserted with the forward-facing surface 24 i In a and preferably smaller than the gap The azimuth span Preferably, the protrusion 1201 (see Figure 4A ) has an axial span The axial span Greater than the first pin and the nth pin 20 n The axial distance between and / or the first pin 201 has an azimuth abutment portion, the azimuth abutment portion reducing the abutment between the first pin 201 and the nth pin 20 n The abutment can be a separate component, but for conceptual simplicity, we attribute the abutment to the first pin because the abutment limits the axial clearance between the first pin and the second pin. arrive Direction exceeds rotation.

[0056] exist FIG. 4A to FIG. 4E It can be seen that the catheter 30 is azimuthally oriented relative to the tube 130 and thus any component including the catheter is azimuthally oriented relative to another component (e.g. Figure 1 The filter element 1) of this mechanism: FIG. 4A to FIG. 4E In the embodiment, there is a tube 130 having a tube axis 102 aligned with the catheter axis 2. The tube 130 has an outer peripheral surface 138, the radius of which is less than or equal to the free radius r of the catheter 30. i Thus, when the tube 130 is inserted into the catheter 30, the tube 130 has a side 136 facing rearward and the tube passes through the pin 20. i The radially inwardly facing surface of is at least approximately centered within the conduit 30. FIG. 4A to FIG. 4E In the figure, only the pin 20 of the catheter is depicted. i , to visualize these pins and protrusions 120 j The projections extend radially outward from the outer peripheral surface of the tube 130 beyond the free radius r of the conduit. i .

[0057] Figure 4A The pin 20 extending into the through hole 42 is shown. i The conduit 30 (which may be part of a fluid handling filter element, such as Figure 1 When the filter element 1 is located above the tube 130, the tube can be part of the socket of the filter housing. Figure 4A As shown, the catheter 30 can be moved in a forward direction 3 (see Figure 4E The arrow in the figure) moves until at least one pin 20 i Front side 24 i , immediate sale 20 i The forward-facing surface 24 i , against a surface having a value greater than The azimuth span The j-th protrusion 120 j The side facing the rear end 126 j In the example shown, accidentally, axial movement of the conduit 30 in the forward direction is blocked by the rearward-facing side 1261 of the first protrusion 1201 abutting against the forward-facing surface 241 of the first pin 201. When a slight force is applied in the forward direction 3, the filter conduit 30 can be rotated relative to the tube 130 in the direction indicated by the curved arrow. Figure 4B As shown, pin 20 i Slide over the first protrusion 1201. After a given rotation, the forward-facing side of the first pin 201 can slide on the rearward-facing side 1262 of the optional second protrusion 1212. In this preferred example, the second protrusion 1212 optionally has a corresponding i The slope s i =(1±α s ) In addition, if the optional protrusion 120 j are positioned accordingly (e.g. in Figure 4C 1202, 1203), pin 20 i The forward-facing side 24 i The protrusion 120 may be j The rear-end-facing surface 126 j Slide up or over the rearward facing surface of the projection.

[0058] The conduit 30 may be provided at the protruding portion 120 j The first pin 201 is slid upward until the side of the first pin 201 abuts against the side of the first protrusion 1201. It can be said that the sides mutually restrict further rotation of the catheter, such as Figure 4E shown.

[0059] Next, if Figure 4D As shown, because the first protrusion 1201 has the largest azimuth gap Aligned, the first protrusion 1201 (in this example) is at the nth pin 20 n Between the first pin 201 and the pin 20 i It can be moved forward (indicated by arrow 3) to its final position. m Preferably smaller than the corresponding pin 20 i , 20 i+1 The azimuth gap between In addition, the remaining protrusions 1202 to 120 m(In this example, m=4, but other values ​​of m may be used) are each azimuthally positioned adjacent to two adjacent pins 20 i This means that if the side surfaces of the first pin 201 and the first protrusion 1201 facing each other abut against each other, the surface 126 facing the rear end j in the backward direction (with Figure 4E The axial projection on the pin 20 is opposite to the arrow 3 pointing forward in FIG. i In addition, the front-facing surface 24 i The forward projection will not be aligned with the projection 120 j Interfere with each other.

[0060] Figures 5 to 8 Another fluid treatment filter element 1, or more specifically, an ion exchange filter element 1 is shown. The fluid treatment filter element 1 has a tube 30 having pins 20 on a first surface. Inside the tube may be particles containing ion exchange resin or any other ion exchange component. The front and rear ends of the tube are covered with screens to keep the particles inside the tube 30. About the pins 20 i , Figure 1 The description up to Figure 4 can also be applied to Figures 5 to 8 .

[0061] Reference numerals list

[0062] 1 Fluid handling element (optional), such as a fluid filter element or an ion exchange element

[0063] 2 Longitudinal axis

[0064] 12 Reference plane

[0065] 20 i Pin (1≤i≤n)

[0066] twenty four i Surface of the i-th pin facing forward / Surface of the i-th pin facing away from the rear end cap

[0067] 25 i The radially inward facing surface of the i-th pin

[0068] 26 i The surface of the i-th pin facing the rear end cover

[0069] 29 i Abutment (optional)

[0070] 30 Catheter / First Item

[0071] 32 duct wall (optional)

[0072] 34 Front end (optional)

[0073] 36 Backend (optional)

[0074] 37 Inner surface of the catheter (optional)

[0075] 38 Outer surface of the catheter (optional)

[0076] 40 Front cover (optional)

[0077] 42 Through holes (optional)

[0078] 50 Filter element (optional)

[0079] 52 Channels (optional), e.g. channels for filter elements

[0080] 60 Rear end cover (optional)

[0081] 64 Surface of the rear end cover 60 facing the front end cover (optional)

[0082] 66 an optional rearwardly facing surface of the rear end cap 60 (optional), wherein the rearwardly facing surface 66 faces in the opposite direction to the front end cap facing surface 64 of the rear end cap 60

[0083] 100 Fluid handling housing (optional), such as a filter housing or a housing for an ion exchange filter element

[0084] 102 longitudinal axis (optional)

[0085] 120 j Protrusion (1≤j≤m) (optional)

[0086] 124 j Forward facing surface of jth projection (optional)

[0087] 125 j Radially outward facing surface of j-th projection (optional)

[0088] 126 j Surface of the jth protrusion facing the rear end cover (optional)

[0089] 129 j Abutment (optional)

[0090] 130 Tube / Second Item

[0091] 136 Side of the tube 130 facing the rear end cap / distal end of the tube 130 / free end of the tube 130 (optional)

[0092] 138 Outer peripheral surface of tube 130 (optional)

[0093] d i The i-th surface 22 of the i-th pin facing the end cap i Distance from reference plane 12 (optional)

[0094] Δd i,i′ No. i Pin 20 i The forward-facing surface 24 i With the i′ pin 20 i′ The forward-facing surface 24 i′ Axial distance between (optional)

[0095] Azimuth position of the i-th pin (optional)

[0096] Azimuth span of the i-th pin (optional)

[0097] No. i Pin 20 i With the i′ pin 20 i′ Azimuth distance between (optional)

[0098] The j-th protrusion 120 j Azimuth span (optional)

[0099] The j-th protrusion 120 j and the j′th protrusion 120 j′ Azimuth distance between (optional)

[0100] r i The free radius defined by the radially inwardly facing surface of the i-th pin (optional)

[0101] R j The maximum radius defined by the radially outward facing surface of the jth projection (optional)

Claims

1. A conduit (30) for a fluid treatment filter element (1) and / or a conduit (30) for a housing (100) of a fluid treatment filter element (1), wherein: The conduit (30) has a first cylindrical surface (37, 38) defining a first longitudinal axis (2), wherein - said first cylindrical surface (37, 38) has a front end and a rear end, -n pins (20 i ,1≤i≤n) in the azimuth position The position extends from the first cylindrical surface (37, 38) to the azimuth position n is a natural number, where is the i-th pin (20 i )’s azimuth span, - Each pin (20 i ) has a forward-facing surface (24 i ), the forward-facing surface faces away from the rear end, - Pin i (20 i ) and the (i+1)th pin (20 i+1 ) are separated from each other by a distance And wherein the nth pin (20 n ) is adjacent to the first pin (201) in azimuth, and, It is characterized in that With the i-th pin (20 i )’s corresponding azimuth position changes, the forward-facing surface (24 i ) and the distance (d i ), from the first pin (201) toward the nth pin (20 n ) increases or decreases by a distance change Δd i,i+1 , and from the nth pin (20 n ) increases or decreases a value when it moves toward the first pin (201) The reference plane (12) is perpendicular to the first longitudinal axis (2) and is located between all n pins (20 i ), and α∈{0.25,0.2,0.15,0.1,0.05,0.025,0.01,0}, and the nth pin (20 n ) and the azimuth distance between the first pin (201) The absolute value is greater than or equal to any other pair of adjacent pins (20 i ,20 i+1 ) between the maximum azimuth distance Right now 2. The conduit (30) for a fluid treatment filter element and / or the conduit (30) for a housing of a fluid treatment filter element according to claim 1, characterized in that: The conduit (30) comprises at least a conduit wall (32), wherein the conduit wall has a front end (34), a rear end (36), an inner surface (37) and an outer surface (38), wherein the inner surface (37) or the outer surface (38) is the first cylindrical surface (37, 38) of the conduit (30).

3. The conduit (30) for a fluid treatment filter element and / or the conduit (30) for a housing of a fluid treatment filter element according to claim 1 or 2, characterized in that: The pin (20 i ) facing the front end (34) i ) is tilted in the azimuth direction.

4. A conduit (30) for a fluid treatment filter element and / or a conduit (30) for a housing of a fluid treatment filter element, respectively, according to at least one of claims 1 to 3, characterized in that: The first pin (201) and the nth pin (20 n ) respectively have azimuthally opposed abutment portions (291, 29 n ).

5. A conduit (30) for a fluid treatment filter element and / or a conduit (30) for a housing of a fluid treatment filter element, respectively, according to at least one of claims 1 to 4, characterized in that: Distance change Δd i follow and / or Among them, |c i+1 (1-α c )|≤|c i |≤c i+1 (1+α c ), and α c ∈{0.25,0.2,0.15,0.1,0.05,0.025,0.01,0}.

6. A tube (130) for a housing of a fluid-processing filter element and / or a tube (130) for a fluid-processing filter element, the tube having a second cylindrical surface (138), the second cylindrical surface being used to at least partially receive a first volume surrounded by a first cylindrical surface (37, 38) of a conduit (30) according to any one of claims 1 to 5, or the second cylindrical surface being used to at least partially receive the first cylindrical surface (37, 38) in a second volume surrounded by the second cylindrical surface (138), wherein: - the second cylindrical surface defines a second longitudinal axis (102), and the second cylindrical surface has a second front end and a second rear end, and - at least a first protrusion (1201) extends from said second cylindrical surface (138), and - The first protrusion (1201) has an azimuthal span and has a facing pin (20 i )’s surface, It is characterized in that For all i+1≤n, the azimuth span More than two pins (20 i ) And the azimuth span Less than 7. The tube (130) according to claim 6, characterized in that (m-1) additional protrusions (120 j , 2≤j≤m) protrudes from the second surface (138), wherein all protrusions (120 j ) has an associated set of azimuth angles And, when the second longitudinal axis (102) is aligned with the first longitudinal axis (2) and the conduit (130) and the tube (30) are oriented to comply with the condition In the case of 8. The tube (130) according to claim 6 or 7, wherein: The tube (30) comprises at least a tube wall, wherein the tube wall has a front end, a rear end, an inner surface and an outer surface, wherein the inner surface (37) or the outer surface (38) is (i) a first cylindrical surface (37, 38) of a conduit (30) according to any one of claims 1 to 5, or (ii) The second cylindrical surface (138) of the tube (130) according to claim 6 or 7.

9. A kit comprising at least: - A tube (130) according to any one of claims 6 to 8, and - A catheter (30) according to any one of claims 1 to 5.

10. A fluid treatment filter element (1), in particular a fluid treatment filter element (1) for a housing according to claim 12, the fluid treatment filter element (1) comprising at least: - a fluid channel (52) having a longitudinal channel axis (2) and having a front side and a rear side; - a through hole (42) located in the front side; - A conduit (30) according to any one of claims 1 to 5, wherein the conduit (30) is in fluid communication with the fluid channel (52) via the through hole (42) in the front side of the fluid filter element (1), and wherein the front end (34) of the conduit (30) faces away from the rear end of the fluid filter element (1), and wherein the longitudinal channel axis (2) is a first longitudinal axis (2).

11. The fluid treatment filter element according to claim 10, characterized in that: The fluid treatment filter element is a fluid filter element and further comprises: - a filter element (50), - a front end cover (40) sealingly attached to the front side of the filter element (50), - A rear end cap (60) sealingly attached to the rear side of the filter element (50).

12. The kit of claim 9, wherein: The housing for the fluid treatment filter element according to claim 10 or 11 comprises at least: - bottom of the housing, a housing cover removably attached to the bottom, wherein the housing cover and the housing bottom enclose a space configured to receive the filter cartridge, - a fluid handling socket, wherein the fluid handling socket is located inside the filter housing, It is characterized in that The fluid handling socket has the tube (130), At least the front end or the rear end of the tube (130) is a free end (136), The tube (136) has a fluid opening for receiving fluid from the filter cartridge (1) and / or providing fluid to the filter cartridge (1).

13. A fluid treatment system, comprising the housing according to claim 12 and the fluid treatment filter element (1) according to claim 10 or 11.

14. A method for installing a tube (130) according to any one of claims 6 to 9 into a conduit (30) according to any one of claims 1 to 5 and / or a method for installing a fluid treatment filter element (1) according to any one of claims 10 or 11 into a housing according to claim 12, characterized in that: The method comprises at least the following steps: 14.1 inserting the free end (136) of the conduit (30) into the fluid channel (52) of the filter element (50) via the through hole (42) of the filter element; 14.2 Push the front end of the conduit (130) toward the socket until the pin (20 i ) with its forward-facing surface (24 i ) against the protrusion (120 j ) surface (126 j ); 14.3 While pushing the front end toward the socket, rotate the fluid treatment filter element (1) until further rotation is blocked.

15. The method according to claim 14, characterized in that The method also includes closing the housing cover.

16. The method according to claim 15, characterized in that The method further comprises between step 14.3 and the step according to claim 15: 16.1 Push the front end cover (40) towards the socket until the filter element abuts against the axial stop.

17. The subject matter according to any of the preceding claims, characterized in that The fluid treatment filter element (1) is an ion exchange filter element (1).

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