CN210356716U - Central water collecting pipe, central pipe assembly, filter element assembly and water purification system - Google Patents

Abstract

The utility model provides a central collector pipe, central tube subassembly, filter element group spare and water purification system, the inside of central collector pipe (1) has cavity (106), is provided with first guide way (102) on the outer wall of central collector pipe (1), makes the fluid pass through behind first guide way (102) and is guided, and first guide way (102) extend along the axis direction straight line or the curve of central collector pipe (1); the other end of the first guide groove (102) is also communicated with a second guide groove (103), the second guide groove (103) is arranged between the inner wall and the outer wall of the central water collecting pipe (1), and the other end of the second guide groove (103) is communicated with the cavity (106) through the first end part (11) of the central water collecting pipe (1). Through the utility model discloses make the inside cavity of central collector pipe obtain the biggest utilization in the axis direction, improve the filter effect, can also make the more even faster derivation of producing water of diaphragm, do not have the big reliability problem that leads to of derivation speed difference.

Description

Central water collecting pipe, central pipe assembly, filter element assembly and water purification system

Technical Field

The utility model belongs to the technical field of the water purification, concretely relates to central collector pipe, central tube subassembly, filter element group spare and water purification system.

Background

For water purifiers, the small volume is a trend, and therefore more and more composite filter element structures are researched. For roll type membranes, including roll type reverse osmosis membrane components and roll type nanofiltration membrane components, a central water collecting pipe is required to be included, and the central water collecting pipe plays a role in supporting and collecting produced water. At present, a plurality of composite filter element structures are integrated in pretreatment and aftertreatment, and a composite filter element structure integrating a fine filter element and other filter elements is provided. And current central collector pipe is through seting up radial hole in order to realize intaking to central collector pipe inside at its interior outer wall with lining up, but such structure does not utilize the whole length of central collector pipe cavity completely effectively for the filter core production filterable degree of the inside or outside of central collector pipe does not make the biggest use of, and the filter effect is not good, and still there is the product water of diaphragm to derive slowly, derive that the speed difference is big, and the reliability problem appears.

And the core spare part of purifier is the filter core of performance filtering capability, and traditional purifier contains multistage filter core, and the bottle is in large quantity and causes the complete machine volume to be bigger than normal, and the filter core at different levels trades the inconsistent cycle, increases and trades the core inconvenient nature. In recent years, the small volume of the water purifier becomes an industry development trend, and more multi-stage composite filter elements are used on products. However, most of the existing composite filter elements are two-stage composite and three-stage composite, and compared with the traditional water purifier containing a single-stage filter element, the volume of the composite filter element is obviously reduced. However, if the multi-stage filter element of the filter element composite water purifier can play a purifying role, the volume of the water purifier can be further reduced.

Because the central water collecting pipe in the water purifier in the prior art does not fully and effectively utilize the whole length of the cavity of the central water collecting pipe, the filtering degree of the filter element inside or outside the central water collecting pipe is not utilized to the maximum extent, and the filtering effect is poor; the problems of slow water output of the diaphragm, large difference of output speed and reliability also exist; and do not have the integrative integrated structure of meticulous filter core and other filter cores, and lead to filter element group spare volume great technical problem, consequently the utility model discloses study design a central collector pipe, central tube subassembly, filter element group spare and water purification system.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the central collector pipe of the purifier among the prior art and having the whole length that does not utilize central collector pipe cavity effectively completely for the not good defect of filter effect, thereby provide a central collector pipe, center tube subassembly, filter element group spare and water purification system.

The utility model provides a central water collecting pipe, wherein the inside of the central water collecting pipe is provided with a cavity, the outer wall surface of the central water collecting pipe is provided with a first guide groove, so that fluid is guided after passing through the first guide groove, and the first guide groove extends along the axial direction of the central water collecting pipe in a straight line or a curve way; the other end of the first guide groove is communicated with a second guide groove, the second guide groove is arranged between the inner wall and the outer wall of the central water collecting pipe, and the other end of the second guide groove is communicated with the cavity through the first end of the central water collecting pipe.

Preferably, the first and second electrodes are formed of a metal,

the first guide groove is not communicated with the cavity; and/or the central water collecting pipe is also provided with a second end part opposite to the first end part, a central pipe outlet is arranged at the second end part, and the central pipe outlet is communicated with the cavity.

Preferably, the first and second electrodes are formed of a metal,

the periphery wall of the second end portion is provided with a first sealing groove, and/or the periphery wall of the first end portion is provided with a second sealing groove.

Preferably, the first and second electrodes are formed of a metal,

a step structure is formed at the position where the outlet of the central tube is connected with the cavity, the cross sectional area of the cavity is larger than that of the outlet of the central tube, and a second step is arranged at the step end face of the step structure; and/or a first step is formed at the position where the second sealing groove is connected with the peripheral wall of the central water collecting pipe.

The utility model also provides a center tube assembly, it includes preceding arbitrary central collector pipe, still including setting up the end cover of first end, the end cover with the periphery wall of first end combines and forms sealedly, and along the axial the end cover with have the space that can hold the fluid flow and pass through between the first end.

Preferably, the first and second electrodes are formed of a metal,

when the central water collecting pipe comprises a second guide groove, the second guide groove is communicated with the spacing space, and the spacing space is communicated with the cavity.

Preferably, the first and second electrodes are formed of a metal,

when a second sealing groove is formed in the peripheral wall of the first end, an O-shaped sealing ring is arranged at the second sealing groove, and the end cover is an O-shaped ring sealing end cover; alternatively, the second seal groove is provided as a threaded seal structure and the end cap is a threaded seal end cap.

The utility model also provides a filter element group spare, it includes preceding arbitrary center tube group spare, when the center collector pipe includes first guide way and second guide way, filter element group spare still includes the filter core, the filter core sets up the periphery of center collector pipe makes water follow the filter core permeates extremely the first guide way of center collector pipe, again along second guide way and then get into in the cavity.

Preferably, the first and second electrodes are formed of a metal,

the filter element is a roll-type membrane filter element and is wound on the peripheral wall of the central water collecting pipe; and/or at least one stage of filter element is arranged in the cavity; .

Preferably, the first and second electrodes are formed of a metal,

the roll-type membrane filter element comprises a roll-type membrane, a glue line and a water inlet grid; and/or the roll-type membrane filter element is a fine filtering filter element; and/or, the at least one stage of filtering filter element comprises a first stage post-treatment filter element and a second stage post-treatment filter element.

Preferably, the first and second electrodes are formed of a metal,

the inner wall surface of the roll-type membrane filter element is provided with a water diversion groove matched with the first guide groove, and the inner wall surface of the central water collecting pipe is provided with a roll-type membrane clamping groove capable of clamping the filter element.

The utility model also provides a water purification system, it includes preceding arbitrary compound filter element group spare.

The utility model provides a pair of central collector pipe, center tube subassembly, filter element group spare and water purification system have following beneficial effect:

the utility model effectively replaces the existing mode of radially arranging radial holes on the central water collecting pipe, so that the inner cavity of the central water collecting pipe can be fully and completely utilized in the axial direction, and the filter element sleeved on the periphery of the central water collecting pipe can perform sufficient filtering action on water in the axial direction, and the filtering degree of the central water collecting pipe or the outer filter element can be maximally utilized, the filtering effect is effectively improved, the produced water of the membrane can be led out more uniformly and quickly, and the problem of reliability caused by large difference of leading-out speed is solved; the surface of the central pipe is provided with the water diversion grooves, and compared with the traditional central pipe with holes at intervals in the radial direction, the water diversion grooves can be uniformly distributed on the surface, so that water is guided more smoothly;

the filter element assembly of the utility model is provided with the fine filter element at the periphery through the central pipe, and the at least one level of filter element is arranged in the cavity of the central water collecting pipe, so that the fine filter element and other filter elements are effectively integrated into a whole through the central water collecting pipe, thereby effectively reducing the volume of the filter element assembly, and the structure of the inner cylinder body is not needed to be adopted in some technologies, so that the structure is more simplified and miniaturized; and the big cavity body characteristic of center tube can be used to put the filter media of aftertreatment function, founds composite filter element structure, or as water container, can avoid because the high phenomenon of first glass of water TDS that the infiltration caused through diluting.

Drawings

Fig. 1 is a schematic front sectional view of the central water collecting pipe of the present invention;

FIG. 2 is a schematic left side view of the structure of FIG. 1 (first end or trailing end side);

FIG. 3 is a schematic front cross-sectional structural view of embodiment 1 of the filter element assembly of the present invention;

FIG. 4 is a front cross-sectional block diagram of the end cap of FIG. 3;

FIG. 5 is a schematic front cross-sectional structural view of embodiment 2 of the filter element assembly of the present invention;

FIG. 6 is a front cross-sectional structural view of the end cap of FIG. 5;

fig. 7 is a schematic view of an expanded configuration of the roll-up membrane cartridge of fig. 3 or 5.

The reference numbers in the figures denote:

1. a central water collection pipe; 11. a first end portion; 12. a second end portion; 13. an intervening space; 101. a first seal groove; 102. a first guide groove; 103. a second guide groove; 104. a first step; 105. a second seal groove; 106. a cavity; 107. a second step; 108. a central tube outlet; 109. a second guide slot outlet; 110. a film rolling clamping groove; 111. a water diversion groove; 2. an end cap; 302. a filter element; 303. an O-shaped sealing ring; 501. rolling the membrane; 502. glue lines; 503. and (4) a water inlet grid.

Detailed Description

As shown in fig. 1 to 7, the present invention provides a central manifold 1, wherein the central manifold 1 has a cavity 106 inside, and the outer wall surface of the central manifold 1 is provided with a first guide groove 102, so that a fluid is guided after passing through the first guide groove 102, and the first guide groove 102 extends along a straight line or a curved line in the axial direction of the central manifold 1; the other end of the first guide groove 102 is further provided with a second guide groove 103 in communication therewith, the second guide groove 103 is disposed between the inner wall and the outer wall of the central collecting pipe 1, and the other end of the second guide groove 103 is in communication with the cavity 106 through the first end portion 11 of the central collecting pipe 1.

The utility model effectively replaces the existing mode of radially arranging radial holes on the central water collecting pipe, so that the inner cavity of the central water collecting pipe can be fully and completely utilized in the axial direction, and the filter element sleeved on the periphery of the central water collecting pipe can perform sufficient filtering action on water in the axial direction, and the filtering degree of the central water collecting pipe or the outer filter element can be maximally utilized, the filtering effect is effectively improved, the produced water of the membrane can be led out more uniformly and quickly, and the problem of reliability caused by large difference of leading-out speed is solved; the diversion channel has been seted up on the center tube surface, compares in the center tube of the radial interval trompil of tradition, and distribution that the diversion channel can be even is on the surface for the water guide is more smooth.

The utility model discloses a design a novel central collector pipe, it is integrated with the aftertreatment filter core to realize meticulous filtration filter core. Also has the beneficial effects that: 1) the novel central water collecting pipe has the same function as the traditional central pipe, and has the functions of supporting the membrane as a central shaft and collecting produced water; 2) the central tube is provided with a cavity for filling an after-treatment filter element, thereby realizing the composition of the multi-stage filter element.

Preferably, the first and second electrodes are formed of a metal,

the first guide groove 102 is not communicated with the cavity 106; and/or the central water collecting pipe 1 further has a second end 12 opposite to the first end 11, and a central pipe outlet 108 is arranged at the second end 12, and the central pipe outlet 108 is communicated with the cavity 106. The first guide groove in the utility model is not directly communicated with the cavity, which is different from the structure form of adopting radial holes in the prior structure, and prevents water on the peripheral wall of the central water collecting pipe from directly entering the cavity through the radial holes without utilizing the axial length of the central water collecting pipe to the maximum and also preventing the filter element which is not arranged on the periphery of the central water collecting pipe from utilizing the maximum length; the fluid is discharged through the central pipe outlet by the first guide groove, the second guide groove and the cavity through the central pipe outlet, and the filtering filter element can be arranged in the cavity, so that the fine filtering filter element and other filter elements can be effectively integrated through the central water collecting pipe, the size of the filter element assembly is effectively reduced, and the structure of an inner cylinder body is not required to be adopted in certain technologies, so that the structure is simpler and more miniaturized; and the big cavity body characteristic of center tube can be used to put the filter media of aftertreatment function, founds composite filter element structure, or as water container, can avoid because the high phenomenon of first glass of water TDS that the infiltration caused through diluting.

Preferably, the first and second electrodes are formed of a metal,

a first sealing groove 101 is formed in the outer peripheral wall of the second end portion 12, and/or a second sealing groove 105 is formed in the outer peripheral wall of the first end portion 11. The first seal groove that sets up on the second tip can seal this center tube delivery port play, can seal the radial periphery of periphery wall of first tip through the second seal groove for rivers can only get into the cavity through the second guide way, prevent that the fluid from leaking.

Preferably, the first and second electrodes are formed of a metal,

a step structure is formed at the position where the central pipe outlet 108 is connected with the cavity 106, the cross-sectional area of the cavity 106 is larger than that of the central pipe outlet 108, and a second step 107 is arranged at the step end face of the step structure; and/or, a first step 104 is formed at a position where the second sealing groove 105 meets the outer circumferential wall of the central water collecting pipe 1. The filter element that sets up through the second step can play the effect of joint or location to the inside filter core that sets up of cavity, can play the effect of location to the internal perisporium of the filter core of center collector pipe periphery through the setting of first step.

The utility model also provides a central tube assembly, it includes preceding any one central collector 1, still including setting up the end cover 2 of first end, end cover 2 with the periphery wall of first end 11 combines and forms sealedly, and along the axial end cover 2 with have the interval space 13 that can hold the fluid and flow through between the first end 11.

This is the utility model discloses a structural style of center tube assembly, through including aforementioned central collector pipe and the end cover that sets up at first end, can realize sealed effect to this tip through the end cover for fluid can only get into the cavity through the periphery wall of central collector pipe, through first guide way and second guide way, prevents to prevent to leak in first end department, and has realized effectively through end cover and first end at the ascending interval space of axial that second guide way carries out the passageway that communicates with the cavity.

The fluid at the outer wall of the central water collecting pipe is guided to the end part of the central water collecting pipe through the first guide groove and the second guide groove in a linear or curved manner along the axial direction so as to be further guided into the cavity, the existing mode that radial holes are formed in the central water collecting pipe along the radial direction is effectively replaced, the inner cavity of the central water collecting pipe can be fully and completely utilized in the axial direction, the filter element sleeved on the periphery of the central water collecting pipe can perform sufficient filtering action on water in the axial direction, the filtering degree of the filter element inside or outside the central water collecting pipe can be maximally utilized, and the filtering effect is effectively improved; the diversion flume has been seted up on the center tube surface, compares in the center tube of the radial interval trompil of tradition, and diversion flume distribution that can be even is on the surface, and the water guide is more smooth.

Preferably, the first and second electrodes are formed of a metal,

when the central collecting pipe 1 includes the second guide groove 103, the second guide groove 103 communicates with the space 13, and the space 13 communicates with the cavity 106. This is the utility model discloses a spacing space realizes the preferred structural style of second guide way and cavity intercommunication.

Preferably, the first and second electrodes are formed of a metal,

when a second sealing groove 105 is formed in the outer peripheral wall of the first end portion 11, an O-ring 303 is arranged at the second sealing groove 105, and the end cover 2 is an O-ring sealing end cover (embodiment 1); alternatively, the second seal groove 105 is provided as a threaded seal structure, and the end cap 2 is a threaded seal end cap (embodiment 2).

This is the utility model discloses a two kinds of different structural style of cooperation structure between end cover and the second sealing, embodiment 1 and embodiment 2 promptly have let the formula of book filter core that uses this center tube to roll up system realize sealed, and the indispensable must have corresponding end cover 2. The end cover 2 in the embodiment 1 is an end cover for sealing by using an O-ring, and has a simple structure; the end cap 2 of example 2 is an end cap that seals with threads, which must be matched to the threads on the center tube.

Example 1: o-ring end cap seal

As shown in fig. 3-4, a rolled membrane rolled using an O-ring seal format comprises a central header 1, a filter element 302 (preferably a rolled membrane); an O-ring seal 303, an end cap 2 of the O-ring seal. The inlet water of the roll-type membrane is positioned at the sealed end cover, the filtered water flows out from the concentrated water end, the pure water passes through the first guide groove 102, the second guide groove 103 and the second guide groove outlet 109 and enters the cavity 106 under the action of the end cover 2, and the water path of the pure water is shown by an arrow.

Example 2: threaded end cap seal

As shown in fig. 5-6, the spiral wound membrane, rolled with a thread seal, comprises a central water collection tube 1, a filter element 302 (preferably a spiral wound membrane), and a thread sealed end cap 2. The inlet water of the roll-type membrane is positioned at the sealed end cover, the filtered water flows out from the concentrated water end, the pure water passes through the first guide groove 102, the second guide groove 103 and the second guide groove outlet 109 and enters the cavity 106 under the action of the end cover 2, and the water path of the pure water is shown by an arrow.

As above two kinds of embodiments, all can adorn the demand filter core in the cavity, can be for rearmounted carbon-point, ultrafiltration, year silver-colored active carbon etc. its structure cooperation center tube cavity design. As for the above two examples, the membrane used for the fine filtration filter element can be a reverse osmosis membrane or a nanofiltration membrane.

The utility model also provides a filter element group spare, it includes preceding arbitrary center tube group spare, when the center collector pipe includes first guide way and second guide way, filter element group spare still includes filter core 302, filter core 302 sets up the periphery of center collector pipe 1 makes water follow filter core 302 permeates to the first guide way of center collector pipe 1, again along second guide way and then get into in the cavity 106.

The structure form of the filter element component of the utility model is that through the structure of the central tube component and the filter element, so that water penetrates from the filter element 302 to the first guide groove of the central collecting duct 1 and then along the second guide groove into the cavity 106, thereby realizing the filtering function to the water, leading the fluid to pass through the first guide groove, the second guide groove and the cavity, then discharged through the outlet of the central pipe, replaces the prior mode of arranging radial holes on the central water collecting pipe along the radial direction, so that the inner cavity of the central water collecting pipe can be fully and completely utilized in the axial direction, the filter element sleeved on the periphery of the central water collecting pipe can fully filter water in the axial direction, so that the filtering degree of the filter element inside or outside the central water collecting pipe can be utilized to the maximum extent, and the filtering effect is effectively improved; the cavity can be also provided with a filtering filter element, so that the fine filtering filter element and other filter elements can be effectively integrated into a whole through the central water collecting pipe, the volume of the filter element assembly is effectively reduced, and the structure of an inner cylinder body is not required to be adopted in certain technologies, so that the structure is simpler and more miniaturized; and the large cavity of the central tube is characterized by being used for placing filter materials with post-treatment functions to construct a composite filter element structure.

Preferably, the first and second electrodes are formed of a metal,

the filter element 302 is a roll-type membrane filter element and is wound on the peripheral wall of the central water collecting pipe 1; and/or at least one stage of filtering element is also arranged in the cavity 106. The filter element is in the optimal structure form of the filter element, and the filter element is combined to the central water collecting pipe in a winding mode through the roll-type membrane filter element, so that the structure form of the filter element is formed; and at least one stage of filter element can be arranged in the cavity, so that the purified water can be guided to the at least one stage of filter element in the cavity by the first guide groove on the outer wall of the water landscape central pipe and the second guide groove between the inner wall and the outer wall, and secondary filtration is realized, thereby improving the filtering effect.

Preferably, the first and second electrodes are formed of a metal,

the roll-type membrane filter element comprises a roll-type membrane 501, a glue line 502 and a water inlet grid 503; and/or the roll-type membrane filter element is a fine filtering filter element; and/or, the at least one stage of filtering filter element comprises a first stage post-treatment filter element and a second stage post-treatment filter element. This is the utility model discloses a formula of book membrane filter core's preferred structural style, two-stage aftertreatment filter core can form multistage aftertreatment and filter, improves the filter effect. In order to roll the roll film using the central tube, a schematic view of the roll film is shown in fig. 7. A rolled membrane 501, a glue line 502 and a water inlet grid 503. Wherein, the net of intaking is placed on roll formula diaphragm, and the rubber thread is beaten on the net of intaking, permeates simultaneously on the diaphragm. Fig. 7 shows a group of membranes, water inlet grids and glue lines, which can be rolled into a multi-unit combination, so long as the membranes and the glue lines are placed as shown in fig. 7. After the film is placed, the film can be rolled by rolling the film by using a film rolling machine.

Preferably, the first and second electrodes are formed of a metal,

a water guide groove 111 which can be matched with the first guide groove 102 is formed in the inner wall surface of the roll-type membrane filter element, and a roll-type membrane clamping groove 110 which can clamp and connect the filter element is formed in the inner wall surface of the central water collecting pipe 1. Can realize the cooperation with the first guide way on the central collector pipe through the diversion trench, be favorable to a roll formula membrane filter core and the fluid on the central tub of outer wall direction mobile effect, can play location and joint effect to the inside filtration filter core of central collector pipe through rolling up the membrane draw-in groove, improve the installation accuracy.

The utility model also provides a water purification system, it includes preceding arbitrary compound filter element group spare.

The utility model discloses a water collecting center tube of no diversion hole, it can realize supporting roll formula membrane and collecting as the center pin and produce the water function, and can pack the filter media that needs in its cavity, can regard as composite filter element's realization basis. The specific implementation mode is as follows:

as shown in fig. 1, the center tube includes a first sealing groove 101, and an O-ring may be added on the sealing groove to realize sealing; the first guide groove 102 is formed in the surface of the central tube, the depth of the first guide groove is smaller than the wall thickness of the central tube, the first guide groove is square, and the first guide groove is used for collecting water produced by the fine filtering filter element; the second guide groove 102 is formed in the side wall of the water inlet end of the central pipe, is communicated with the first guide groove 102, and is used for guiding water collected by the first guide groove 102 into the cavity 106; the first step 104 is used for realizing that the second seal groove 105 is arranged on the wall of the central pipe, and the strength of the central pipe is not reduced; a second sealing groove 105, which may be an O-ring seal or a thread seal; the second step 107 has a limiting function, so that the cavity 106 is prevented from being stuck to the wall surface and not permeable when being filled with the filter element; the center tube outlet 108 is a pure water outlet; a second guide channel outlet 109; the film rolling clamping groove 110 is formed in the inner wall surface of the central tube and is used for ensuring that the central tube does not slip under the action of a tool when the filter element is rolled; the diversion channel 111 that radially offers is used for cooperating first guide way 103 to collect jointly and produces water, makes to produce water and collects more smoothly. It is envisioned that the above features are essential for successful production of the center tube.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (12)

1. A central water collecting pipe is characterized in that:

the interior of the central water collecting pipe (1) is provided with a cavity (106), the outer wall surface of the central water collecting pipe (1) is provided with a first guide groove (102) so that fluid passes through the first guide groove (102) and is guided, and the first guide groove (102) extends along the axial direction of the central water collecting pipe (1) in a straight line or a curve; the other end of the first guide groove (102) is also communicated with a second guide groove (103), the second guide groove (103) is arranged between the inner wall and the outer wall of the central water collecting pipe (1), and the other end of the second guide groove (103) is communicated with the cavity (106) through the first end part (11) of the central water collecting pipe (1).

2. The central manifold of claim 1, wherein:

the first guide groove (102) is not communicated with the cavity (106); and/or the central water collecting pipe (1) is also provided with a second end (12) opposite to the first end (11), a central pipe outlet (108) is arranged at the second end (12), and the central pipe outlet (108) is communicated with the cavity (106).

3. The central manifold of claim 2, wherein:

the outer peripheral wall of the second end portion (12) is provided with a first sealing groove (101), and/or the outer peripheral wall of the first end portion (11) is provided with a second sealing groove (105).

4. The central manifold of claim 3, wherein:

a step structure is formed at the position where the central pipe outlet (108) is connected with the cavity (106), the cross sectional area of the cavity (106) is larger than that of the central pipe outlet (108), and a second step (107) is arranged at the step end face of the step structure; and/or a first step (104) is formed at the position where the second sealing groove (105) is connected with the outer peripheral wall of the central water collecting pipe (1).

5. A center tube assembly, characterized by:

comprising a central collector pipe (1) according to any one of claims 1-4, further comprising an end cap (2) arranged at said first end, said end cap (2) being joined to the peripheral wall of said first end (11) and forming a seal, and axially between said end cap (2) and said first end (11) there being a spacing space (13) capable of accommodating a fluid flow.

6. The center tube assembly set forth in claim 5, wherein:

when the central water collecting pipe (1) comprises a second guide groove (103), the second guide groove (103) is communicated with the spacing space (13), and the spacing space (13) is communicated with the cavity (106).

7. The center tube assembly set forth in claim 5, wherein:

when a second sealing groove (105) is formed in the outer peripheral wall of the first end portion (11), an O-shaped sealing ring (303) is arranged at the second sealing groove (105), and the end cover (2) is an O-shaped sealing end cover; alternatively, the second seal groove (105) is provided as a threaded seal structure and the end cap (2) is a threaded seal end cap.

8. A filter element assembly, comprising:

the center tube assembly as claimed in any one of claims 5-7, comprising a filter element (302) when the center header comprises a first guide groove and a second guide groove, the filter element assembly further comprising a filter element (302), the filter element (302) being arranged at the periphery of the center header (1) such that water penetrates from the filter element (302) to the first guide groove of the center header (1) and along the second guide groove into the cavity (106).

9. The filter element assembly according to claim 8, wherein:

the filter element (302) is a roll-type membrane filter element and is wound on the peripheral wall of the central water collecting pipe (1); and/or at least one stage of filtering filter element is also arranged in the cavity (106).

10. The filter element assembly according to claim 8 or 9, wherein:

the roll-type membrane filter element comprises a roll-type membrane (501), a glue line (502) and a water inlet grid (503); and/or the roll-type membrane filter element is a fine filtering filter element; and/or, the at least one stage of filter element comprises a first stage post-treatment filter element and a second stage post-treatment filter element.

11. The filter element assembly according to claim 9, wherein:

the inner wall surface of the roll-type membrane filter element is provided with a water diversion groove (111) matched with the first guide groove (102), and the inner wall surface of the central water collecting pipe (1) is provided with a roll-type membrane clamping groove (110) capable of clamping the filter element.

12. A water purification system, its characterized in that: comprising the filter element assembly of any one of claims 8-11.

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