CN210313758U - Filter element assembly for sealed flow distribution and water purifier - Google Patents

Abstract

The utility model discloses a sealed shunting filter element assembly, belonging to the technical field of water purifiers and solving the technical problems of complex structure and larger volume of the existing filter element assembly, the filter element assembly in the utility model comprises a cylinder body and an end cover arranged at one end of the cylinder body, the end cover is provided with a water inlet and a water purifying port, the filter element assembly comprises a flow divider and a filter element with a central shaft hole, a first gap is formed between the filter element and the inner wall of the cylinder body, the flow divider comprises a central pipe and a spacer ring arranged on the outer periphery of one end of the central pipe close to the end cover, a second gap communicated with the water purifying port is formed between the isolating ring and the central pipe, a water inlet channel communicated with the water inlet and the first gap is formed inside the central pipe, and a water outlet channel communicated with the second gap is formed between the outer side of the central pipe and the hole wall of the central shaft hole. Furthermore, the utility model also discloses a purifier of adopting above-mentioned filter element group spare.

Description

Filter element assembly for sealed flow distribution and water purifier

Technical Field

The utility model relates to a purifier technical field especially relates to a filter element group spare and purifier of sealed reposition of redundant personnel.

Background

With the explosion of the water purification market in recent years, water purifiers are becoming popular and become the most potential products in the field of household appliances. Because the filter element group spare on the purifier belongs to the consumer, consequently need change after using a period, filter element life, the cost of changing the core become the common pain point of consumer and producer, along with the arrival of big flux purifier times, compound filter core and long-term filter core are in the same place, however they are only simple accomplish traditional two to tertiary filter core together, cause the structure of filter element group spare more complicated, the volume is bigger, consequently leads to manufacturing cost greatly increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that overcome prior art not enough and provide a filter element subassembly of sealed reposition of redundant personnel, have compact structure, the characteristics that the volume is retrencied.

In order to solve the technical problem, the utility model adopts the following technical scheme:

the utility model provides a filter element group spare of sealed reposition of redundant personnel, includes the barrel and installs the end cover in barrel one end, be equipped with water inlet and water purification mouth on the end cover, filter element group spare includes the shunt and has the filter core in central shaft hole, the filter core with form first clearance between the barrel inner wall, the shunt includes the center tube and establishes the spacer ring that is close to end cover one end periphery side at the center tube, the spacer ring with form the second clearance with water purification mouth intercommunication between the center tube, the inside intercommunication that forms of center tube the water inlet with the water inlet channel in first clearance, the center tube outside with form between the pore wall in central shaft hole with the play water passageway of second clearance intercommunication.

Furthermore, be equipped with on the lateral wall of spacer ring with the through-hole of water inlet intercommunication, the center tube with be equipped with between the spacer ring and be connected the interface channel of through-hole and inhalant canal, interface channel with the sealed cooperation of spacer ring.

Furthermore, the filter element assembly is further installed including installing the first end seal that the filter core is close to end cover one end, first end seal is equipped with the water hole of crossing of intercommunication second clearance and exhalant canal, cross the water hole with the seal fit of isolating ring, the top of first end seal forms the intercommunication the water inlet with the former water passageway of through-hole, the filter chamber of installation filter core is formed to the below of first end seal.

Furthermore, the central tube, the isolating ring and the first end seal are integrally formed.

Further, the filter element group spare is still including installing the second end seal of the filter core other end, the second end seal is equipped with the perforation that supplies the center tube to pass, the perforation with the center tube seal cooperation, first clearance include by the second end seal with bottom clearance that forms between the barrel diapire, by filter core periphery side and second end seal periphery side with the lateral part clearance that forms between the barrel lateral wall, the center tube bottom with bottom clearance intercommunication.

Furthermore, the bottom end of the central tube abuts against the bottom wall of the cylinder body, and a radial through hole is formed in the side wall, corresponding to the bottom gap, of the central tube.

Further, an inner ring formed by extending inwards in the axial direction is arranged on the end cover, the water purifying port is located in the inner ring, the water inlet is located outside the inner ring, and the inner ring is in sealing fit with the isolating ring to communicate the second gap and the water purifying port.

Furthermore, the filter element assembly further comprises a rear filter element, the upper end of the rear filter element is in sealing fit with the inner ring, and the lower end of the rear filter element is in sealing fit with the isolating ring.

Further, the filter element assembly still includes the suit and is in the leading filter screen in the isolating ring outside, the end cover on have with the interior ring is with the zhonghuan and the outer loop that the inner ring set up with one heart, the water inlet is located between zhonghuan and the outer loop, leading filter screen with the zhonghuan lateral wall cooperation is connected, still be equipped with on the end cover and be located the outer loop with the sparge water export between the end cover lateral wall, the outer loop with be equipped with the intercommunication between the first end seal the third clearance of water inlet and sparge water export.

The utility model also discloses a water purifier, including inlet tube, water purification pipe and any scheme of the aforesaid filter element group spare, advance water piping connection the water inlet of filter element group spare, water purification union coupling the water purification mouth of a river of filter element group spare.

The utility model has the advantages that:

when the filter element assembly is used, raw water flows into a water inlet channel formed inside the central tube after entering the cylinder through the water inlet, then flows to the first gap, is filtered by the filter element and then enters the water outlet channel, and finally flows to the water purifying port through the second gap to be discharged, so that the water path connection structure is simple; furthermore, the utility model provides a shunt can also play the effect with raw water and net moisture reposition of redundant personnel, so, can increase a leading filtration piece between the entry of water inlet and center tube, has increased a rearmounted filter core between the export in second clearance and water purification mouth to this promotes the purifying effect to the raw water, and compares that prior art whole filter core subassembly structure is compacter, and the volume is retrencied more, and manufacturing cost is lower from this.

The side wall of the isolating ring is provided with a through hole communicated with the water inlet, a connecting channel for connecting the through hole and the water inlet channel is arranged between the central pipe and the isolating ring, and the connecting channel is in sealing fit with the isolating ring. So design, raw water that gets into through the water inlet can flow into the inlet channel through-hole and connecting channel in proper order in, and the water after the purification is discharged by the second clearance between isolating ring and the center tube to this realizes the reposition of redundant personnel of raw water and pure water.

The filter element assembly further comprises a first end seal arranged at one end, close to the end cover, of the filter element, the first end seal is provided with a water passing hole communicated with the second gap and the water outlet channel, the water passing hole is in sealing fit with the isolating ring, a raw water channel communicated with the water inlet and the through hole is formed above the first end seal, and a filter cavity provided with the filter element is formed below the first end seal. The water hole and the isolating ring are in sealing fit, so that purified water can be prevented from leaking into the raw water channel, the filter cavity and the raw water channel are isolated through the first end seal, and water in the raw water channel can be prevented from directly entering the first gap.

The central tube, the isolating ring and the first end seal are integrally processed and formed. By the design, later-stage assembling steps are reduced, production efficiency is improved, and meanwhile, the sealing performance of the water holes and the isolating ring is guaranteed.

The filter element group spare is still sealed including the second end of installing at the filter core other end, and the second end seals and is equipped with the perforation that supplies the center tube to pass, and perforation and center tube seal fit, first clearance include by the second end seal with the barrel diapire between the bottom clearance that forms, by the filter core periphery side with the second end seal the lateral part clearance that forms between periphery side and the barrel lateral wall, center tube bottom and bottom clearance intercommunication. So design, through installing filter core unsettled in the barrel, can realize the intercommunication in inhalant canal and first clearance, offset with filter core bottom and barrel diapire, run through the mode of filter core with intercommunication lateral part clearance and inhalant canal through the center tube and compare, this scheme structure is simpler, and manufacturing cost is lower.

The bottom of center tube supports and leans on the diapire of barrel, is equipped with radial through-hole on the corresponding lateral wall in bottom clearance of center tube. So design can play the supporting role to the filter core through the shunt, has improved the installation stability of filter core, the equipment of the filter core subassembly of also being convenient for simultaneously.

The end cover is provided with an inner ring which extends inwards and axially, the water purifying port is positioned in the inner ring, the water inlet is positioned outside the inner ring, and the inner ring is in sealing fit with the isolating ring so as to communicate the second gap and the water purifying port. So design, water inlet, inner ring and water purification mouth can come out through integrated into one piece processing, need not form through the equipment of a plurality of spare parts, from this greatly reduced assembly cost.

The filter element assembly further comprises a rear filter element, the upper end of the rear filter element is in sealing fit with the inner ring, and the lower end of the rear filter element is in sealing fit with the isolating ring. So design, can promote the purifying effect to water through rearmounted filter core.

The filter element assembly further comprises a front filter screen sleeved on the outer side of the isolating ring, a middle ring and an outer ring which are arranged concentrically with the inner ring are arranged on the end cover, the water inlet is located between the middle ring and the outer ring, the front filter screen is connected with the side wall of the middle ring in a matched mode, a flushing water outlet which is located between the outer ring and the side wall of the end cover is further arranged on the end cover, and a third gap for communicating the water inlet and the flushing water outlet is formed between the outer ring and. So design, can tentatively filter large granule impurity through leading filter screen to this alleviates the purification pressure of filter core, has prolonged the life of filter core from this, can also realize the automatic leading filter screen of washing simultaneously, uses experience with this promotion user.

These features and advantages of the present invention will be disclosed in more detail in the following detailed description and the accompanying drawings.

Drawings

The invention will be further explained with reference to the drawings:

FIG. 1 is an exploded view of a filter element assembly according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a filter element assembly according to an embodiment of the present invention;

FIG. 3 is an enlarged view of part A of FIG. 2;

fig. 4 is a schematic structural view of a flow divider according to an embodiment of the present invention;

FIG. 5 is an assembled cross-sectional view of a filter element, a flow divider, a pre-filter, and a post-filter according to a first embodiment of the present invention;

fig. 6 is a transverse cross-sectional view of an end cap according to a first embodiment of the present invention;

fig. 7 is a schematic structural view of a front filter screen according to a first embodiment of the present invention;

fig. 8 is an exploded schematic view of a rear filter element according to an embodiment of the present invention.

Reference numerals:

100. a barrel; 200. an end cap; 210. a water inlet; 220. a water purifying port; 230. an inner ring; 240. a middle ring; 250. an outer ring; 260. a rinse water outlet; 300. a flow divider; 310. a central tube; 311. a water inlet channel; 312. a radial through hole; 320. an isolating ring; 321. a through hole; 330. a second gap; 400. a filter element; 410. a central shaft hole; 500. a first gap; 510. a bottom gap; 520. a side gap; 600. a water outlet channel; 700. a first end seal; 800. a second end seal; 910. a post-positioned filter element; 911. an upper bracket; 912. a lower bracket; 920. the filter screen is arranged in front.

Detailed Description

The utility model provides a filter element group spare of sealed reposition of redundant personnel, include the barrel and install the end cover in barrel one end, be equipped with water inlet and water purification mouth on the end cover, filter element group spare includes shunt and the filter core that has central shaft hole, the filter core with form first clearance between the barrel inner wall, the shunt includes the center tube and establishes the spacer ring that is close to end cover one end periphery side at the center tube, the spacer ring with form the second clearance with water purification mouth intercommunication between the center tube, the inside intercommunication that forms of center tube the water inlet with the water inlet channel in first clearance, the center tube outside with form between the pore wall in central shaft hole with the play water passageway of second clearance intercommunication.

When the filter element assembly is used, raw water flows into a water inlet channel formed inside the central tube after entering the cylinder through the water inlet, then flows to the first gap, is filtered by the filter element and then enters the water outlet channel, and finally flows to the water purifying port through the second gap to be discharged, so that the water path connection structure is simple; furthermore, the utility model provides a shunt can also play the effect with raw water and net moisture reposition of redundant personnel, so, can increase a leading filtration piece between the entry of water inlet and center tube, has increased a rearmounted filter core between the export in second clearance and water purification mouth to this promotes the purifying effect to the raw water, and compares that prior art whole filter core subassembly structure is compacter, and the volume is retrencied more, and manufacturing cost is lower from this. The technical solutions of the embodiments of the present invention are explained and explained below with reference to the drawings of the embodiments of the present invention, but the embodiments described below are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the embodiment, other embodiments obtained by those skilled in the art without any creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The first embodiment,

Referring to fig. 1 to 8, the filter element assembly for sealed flow distribution in this embodiment includes a cylinder 100 and an end cap 200 installed at one end of the cylinder 100, the end cap 200 is provided with a water inlet 210 and a water purifying port 220, the filter element assembly includes a flow divider 300 and a filter element 400 having a central axial hole 410, the filter element 400 may be made of PP cotton, activated carbon or ultrafiltration membrane, a first gap 500 is formed between the filter element 400 and the inner wall of the cylinder, the flow divider 300 includes a central tube 310 and an isolating ring 320 disposed at an outer peripheral side of one end of the central tube 310 close to the end cap 200, a second gap 330 communicated with the water purifying port 220 is formed between the isolating ring 320 and the central tube 310, a water inlet channel 311 communicated with the water inlet 210 and the first gap 500 is formed inside the central tube 310, and a water outlet channel 600 communicated with the.

When the filter element assembly in the embodiment is used, raw water enters the cylinder body 100 through the water inlet 210 and then flows into the water inlet channel 311 formed inside the central pipe, then flows to the first gap 500, is filtered by the filter element 400 and then flows into the water outlet channel 600, and finally flows to the water purifying port 220 through the second gap 330 and is discharged, and the water path connection structure is simple; in addition, the flow divider 300 of the present embodiment can also perform the effect of dividing the raw water and the clean water, so that a pre-filter can be added between the water inlet 210 and the inlet of the central tube 310, and a post-filter can be added between the outlet of the second gap 330 and the water purifying port 220, so as to improve the raw water purifying effect.

Specifically, as shown in fig. 1 and 4, a through hole 321 communicated with the water inlet 210 is formed in a side wall of the isolating ring in this embodiment, a connecting passage connecting the through hole 321 and the water inlet passage 311 is formed between the central tube 310 and the isolating ring 320, the connecting passage is in sealed fit with the isolating ring 321, that is, a connecting tube is arranged between the central tube 310 and the isolating ring, the connecting tube forms the connecting passage inside, two ends of the connecting tube are respectively communicated with the through hole 321 and the water inlet passage 311, and the connecting tube, the central tube 310, and the isolating ring 320 are integrally formed. In this way, the raw water entering through the water inlet 210 may sequentially flow into the water inlet passage 311 through the through hole 321 and the connection passage, and the purified water is discharged from the second gap 330 between the isolation ring 321 and the central tube 310, thereby achieving the split flow of the raw water and the purified water.

The filter element assembly in this embodiment further includes a first end seal 700 mounted on an end of the filter element 400 close to the end cap 200, the first end seal 700 is provided with a water through hole communicating the second gap 330 with the water outlet channel 600, the central tube 310 penetrates through the water through hole, the water through hole is in sealing fit with the isolation ring 320, namely, the first end seal 700 is hermetically engaged with the isolating ring 320 to prevent the purified water from leaking, a raw water passage is formed above the first end seal 700 to communicate the water inlet 210 with the through hole 321, that is, the space between the water inlet 210 and the first end seal 700 forms the raw water passage, an O-ring is disposed between the outer circumferential side of the first end seal 700 and the inner wall of the cylinder, such that the space of the cartridge 100 below the first end seal 700 forms a filter chamber for installation of the filter cartridge 400, and, as such, the first end seal 700 isolates the filter chamber from the raw water channel, so that water in the raw water channel can be prevented from directly entering the first gap 500.

In order to reduce the post-assembly steps and improve the production efficiency, the central tube 310, the isolating ring 320 and the first end seal 700 in this embodiment are integrally formed, and thus, the sealing performance of the first end seal 700 and the isolating ring 320 can be ensured.

It will be appreciated that the first end seal may also be formed separately from the flow diverter, with the first end seal being in sealing engagement with the spacer ring by means of an O-ring seal.

In addition, the filter element assembly in this embodiment further includes a second end seal 800 installed at the other end of the filter element 400, the second end seal 800 is provided with a through hole for the central tube 310 to pass through, the through hole is in sealing fit with the central tube 310, that is, the second end seal 800 is in sealing fit with the central tube 310 through an O-ring, so as to isolate the water outlet channel 600 from the first gap 500, the first gap 500 includes a bottom gap 510 formed between the second end seal 800 and the bottom wall of the cylinder body, and a side gap 520 formed between the outer peripheral side of the filter element and the outer peripheral side of the second end seal 800 and the side wall of the cylinder body, and the bottom of the central tube 310. So design, through with filter core 400 unsettled installation in barrel 100, can realize inlet channel 311 and first clearance 500's intercommunication, offset with filter core bottom and barrel diapire, run through filter core 400 through center tube 310 and compare with the mode of intercommunication lateral part clearance 520 and inlet channel 311, this scheme structure is simpler, and manufacturing cost is lower.

Preferably, the bottom end of the central tube 310 in this embodiment abuts against the bottom wall of the cylinder, and the side wall of the central tube 310 corresponding to the bottom gap 510 is provided with a radial through hole 312. So design, can play the supporting role to filter core 400 through shunt 300, improve filter core 400's installation stability, the equipment of the filter core subassembly of also being convenient for simultaneously.

In addition, an inner ring 230 formed by extending axially inwards is arranged on the end cover 200, the water purifying port 220 is positioned in the inner ring 230, the water inlet 210 is positioned outside the inner ring 230, and the inner ring 230 is in sealing fit with the isolating ring 320 to communicate the second gap 330 with the water purifying port 210. So design, water inlet 210, inner ring 230 and water purification mouth 220 can come out through integrated into one piece processing, need not form through the equipment of a plurality of spare parts, from this greatly reduced assembly cost.

In order to improve the purification effect of the filter element assembly on raw water, the filter element assembly in this embodiment further includes a post-filter element 910, the post-filter element 910 includes an upper bracket 911, a lower bracket 912 and a scale inhibition filter element, the scale inhibition filter element is filled in a cavity formed by the upper bracket 911 and the lower bracket 912, an outlet pipe is arranged at the upper end of the upper bracket 911, and an inlet pipe is arranged at the lower end of the lower bracket 912, wherein the upper end of the post-filter element 910 is in sealing fit with the inner ring 230, that is, the outlet pipe arranged at the upper bracket 911 and the inner ring 230 are in sealing fit through an O-ring, and the lower end of the post-filter element is in sealing fit with the isolation ring 320, that is, the inlet pipe arranged at the lower bracket 912 and the isolation ring 320 are in sealing fit through an O-ring, so that purified water can be discharged.

In order to prolong the service life of the filter element 400, the filter element assembly in this embodiment further includes a front filter screen 920 sleeved outside the isolation ring 320, in order to improve the compactness of the structure, the front filter screen 920 in this embodiment is sleeved outside the rear filter screen 910, and the bottom of the front filter screen 920 is provided with an installation sleeve sleeved outside the first end seal 700, so as to increase the installation stability of the front filter screen 920, at this time, O-shaped sealing rings are respectively arranged between the installation sleeve and the first end seal 700 and between the installation sleeve and the inner wall of the cylinder. The end cap 200 is provided with a middle ring 240 and an outer ring 250 which are concentric with the inner ring 230, the water inlet 210 is located between the middle ring 240 and the outer ring 250, the upper end of the front filter screen 920 is in fit connection with the side wall of the middle ring 240, preferably in seal fit connection with an O-ring, at this time, raw water enters the cylinder 100 through the water inlet 210 and then is primarily filtered through the front filter screen 920 to filter out large-particle impurities, so that the purification pressure of the filter element 400 is reduced, and the service life of the filter element 400 is prolonged.

In addition, the end cover 200 is further provided with a flushing water outlet 260 located between the outer ring 250 and the side wall of the end cover, a third gap for communicating the water inlet 210 with the flushing water outlet 260 is arranged between the outer ring 250 and the first end seal 700, the third gap can be an annular gap formed between the bottom surface of the outer ring 250 and the first end seal 700, or a plurality of openings are circumferentially arranged at intervals at the bottom of the outer ring 250 when the bottom surface of the outer ring 250 abuts against the first end seal 700, and a small gap is formed between the top wall of each opening and the first end seal. At this moment, the water purifying port 220 is closed, the water inlet 210 and the flushing water outlet 260 are opened, raw water enters through the water inlet 210 and flushes the front filter screen 920, and is discharged through the flushing water outlet 260 through the third gap, so that the front filter screen 920 is automatically flushed, and the use experience of a user is improved.

It will be appreciated that in other embodiments the cartridge assembly may be provided without at least one of the flush water outlet, the pre-filter screen and the post-filter cartridge.

Example II,

This embodiment still discloses a purifier, including inlet tube, water purification pipe and the aforesaid filter element group spare, the water inlet of water piping connection filter element group spare, the water purification mouth of a river of water purification union coupling filter element group spare.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.

Claims (10)

1. The utility model provides a filter element group spare of sealed reposition of redundant personnel, includes the barrel and installs the end cover in barrel one end, be equipped with water inlet and water purification mouth on the end cover, its characterized in that, filter element group spare includes the shunt and has the filter core in central shaft hole, the filter core with form first clearance between the barrel inner wall, the shunt includes the center tube and establishes the spacer ring that is close to end cover one end periphery side at the center tube, the spacer ring with form the second clearance with water purification mouth intercommunication between the center tube, the inside intercommunication that forms of center tube the water inlet with the water inlet channel in first clearance, the center tube outside with form between the pore wall in central shaft hole with the play water passageway of second clearance intercommunication.

2. The filter element assembly according to claim 1, wherein the spacer ring has a through hole on a sidewall thereof for communicating with the water inlet, and a connection channel is provided between the central tube and the spacer ring for connecting the through hole and the water inlet channel, and the connection channel is in sealing engagement with the spacer ring.

3. The filter element assembly according to claim 2, further comprising a first end seal installed at an end of the filter element close to the end cap, wherein the first end seal is provided with a water through hole communicating the second gap with the water outlet channel, the water through hole is in sealing fit with the isolating ring, a raw water channel communicating the water inlet with the through hole is formed above the first end seal, and a filter cavity for installing the filter element is formed below the first end seal.

4. The filter element assembly according to claim 3, wherein the center tube, spacer ring and first end seal are integrally formed.

5. The filter element assembly according to claim 1, further comprising a second end seal mounted to the other end of the filter element, the second end seal having a bore therethrough for passing a center tube therethrough, the bore sealingly engaging the center tube, the first gap comprising a bottom gap defined between the second end seal and the bottom wall of the cartridge body, and side gaps defined between the outer peripheral sides of the filter element and the second end seal and the side wall of the cartridge body, the bottom of the center tube communicating with the bottom gap.

6. The filter element assembly according to claim 5, wherein the bottom end of the central tube rests against the bottom wall of the cylindrical body, and the side wall of the central tube corresponding to the bottom gap is provided with radial through holes.

7. The filter element assembly according to any one of claims 1 to 6, wherein the end cap is provided with an inner ring extending axially inward, the clean water port is located in the inner ring, the water inlet is located outside the inner ring, and the inner ring is in sealing engagement with the isolating ring to communicate the second gap and the clean water port.

8. The filter element assembly according to claim 7, further comprising a rear filter element having an upper end sealingly engaged with the inner ring and a lower end sealingly engaged with the spacer ring.

9. The filter element assembly according to claim 7, further comprising a front filter screen sleeved outside the isolation ring, wherein the end cap is provided with a middle ring and an outer ring which are concentric with the inner ring, the water inlet is located between the middle ring and the outer ring, the front filter screen is connected with the side wall of the middle ring in a matching manner, the end cap is further provided with a washing water outlet located between the outer ring and the side wall of the end cap, and a third gap for communicating the water inlet and the washing water outlet is arranged between the outer ring and the first end seal.

10. A water purification machine comprising a water inlet pipe connected to the water inlet of the filter element assembly, a water purification pipe connected to the water purification port of the filter element assembly, and the filter element assembly of any one of claims 1-9.

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