CN210559707U - Composite filter element for filtering and improving efficiency - Google Patents

Abstract

The utility model discloses a composite filter element for filtering and improving efficiency, which solves the technical problems of small water passing area and poor filtering effect of a rear filter element in the existing composite filter element, the composite filter element in the utility model comprises a shell and a filter element assembly arranged in the shell, the shell is provided with a water inlet and a water purifying opening, a raw water channel communicated with the water inlet is formed between the filter element assembly and the inner wall of the shell, the filter element assembly comprises a front filter element and a rear filter element arranged at the downstream of the front filter element, the front filter element comprises a front filter material provided with a first center hole, the rear filter element comprises a filter shell and a core body arranged in the filter shell, the core body comprises a rear filter material provided with a second center hole and an upper end seal and a lower end seal arranged at the two ends of the rear filter material, the upper end seal is connected with the inner wall of the filter shell in a sealing way, the upper end seal is provided with a through hole communicated with the second center hole and the water purifying opening, a bottom, a side channel is formed between the periphery of the core body and the side wall of the filter shell.

Description

Composite filter element for filtering and improving efficiency

Technical Field

The utility model relates to a purifier technical field especially relates to a filter and carry composite filter element of effect.

Background

Along with the improvement of the requirements of people on the quality of drinking water, a pure water system gradually enters a drinking water system of every family. The existing reverse osmosis water purifier is generally four-stage filtration, and each stage of filtration has a filter element. The first-stage PP cotton filter element mainly filters large-particle impurities; the second-stage front activated carbon filter element is mainly used for adsorbing impurities such as heterochromatic peculiar smell, colloid, residual chlorine and the like and protecting a reverse osmosis filter element at the rear end; the third-stage reverse osmosis filter element can filter impurities such as organic matters, colloid, bacteria, viruses and the like in raw water, particularly has extremely high filtering efficiency on impurities such as inorganic salt, heavy metal ions and the like, so that the reverse osmosis filter element forms a core component of the water purifier, and the filtering effect of the water purifier is directly related to that of the reverse osmosis filter element; the fourth-stage rear active carbon filter element mainly plays a role in absorbing heterochromatic peculiar smell and improving the taste. The four filter elements respectively play their roles, one of the filter elements is absent, and the other filter element can be a PP cotton filter element or an ultrafiltration filter element between the front active carbon filter element and the reverse osmosis filter element, so that the protection effect and the purification effect on the reverse osmosis filter element are further improved. However, the structure of a plurality of filter cores results in that the complete machine is bulky, occupies a large amount of kitchen spaces, and simultaneously, the pipeline overall arrangement between the filter cores is complicated, has improved the risk of leaking, and in addition, the filter core also can lead to filter core life monitoring and warning to complicate more, and the filter core is changed also relatively complicatedly, if have the filter core of the same or similar structure among the multistage filter core, the user has the possibility of changing the mistake even when changing the filter core, has influenced the purifying effect and the user experience of purifier greatly.

In view of the above problems, the composite filter element is produced by assembly, the composite filter element on the market at present adopts the filter elements made of two materials to be compounded along the axial direction of the composite filter element, raw water flows towards the direction of the rear filter element in the axial direction after being filtered by the front filter element, and the raw water is discharged from a water purifying port of the composite filter element after axially passing through the rear filter material in the rear filter element. Therefore, the structure of the composite filter element in the prior art causes the small water passing area of the rear filter element and the poor filtering effect.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that overcome prior art not enough and provide a filter and carry composite filter element of effect, can effectively increase the water passing area of rearmounted filter core to this promotes the filter effect.

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

a composite filter element with filtering and effect improving functions comprises a shell and a filter element assembly arranged in the shell, wherein the shell is provided with a water inlet and a water purifying port, a raw water channel communicated with the water inlet is formed between the filter element assembly and the inner wall of the shell, the filter element assembly comprises a front filter element and a rear filter element arranged on the downstream of the front filter element, the front filter element comprises a front filter element with a first central hole, the rear filter element comprises a filter shell and a core body arranged in the filter shell, the core body comprises a rear filter element with a second central hole and an upper end seal and a lower end seal which are arranged at two ends of the rear filter element, the upper end seal is in sealing connection with the inner wall of the filter shell, the upper end seal is provided with a through hole communicated with the second central hole and the water purifying port, and a bottom channel communicated with the first central hole is formed between the bottom end seal and the inner bottom wall of the, a side passage is formed between the periphery of the core body and the side wall of the filter shell.

Furthermore, a plurality of supporting convex ribs which are distributed radially are arranged between the bottom surface of the lower end seal and the inner bottom wall of the filter shell, and a bottom channel is formed between every two adjacent supporting convex ribs.

Furthermore, the supporting convex ribs and the lower end seal body are processed and molded.

Furthermore, a plurality of water passing notches are uniformly arranged on the peripheral side of the lower end seal at intervals in the circumferential direction.

Furthermore, a positioning slot is arranged on the inner side wall of the filter shell, and a positioning bulge inserted in the positioning slot is arranged on the upper end seal.

Furthermore, the distance between the bottom surface of the positioning slot and the inner bottom wall of the filter shell is H1, and the distance between the bottom surface of the positioning protrusion and the bottom sealing surface of the lower end is H2, so that H1 is greater than H2, and the bottom channel is formed between the bottom sealing surface of the lower end and the inner bottom wall of the filter shell.

Furthermore, the filter shell comprises a filter cylinder and an end cover arranged at one end of the filter cylinder, a water inlet hole communicated with the first central hole and the bottom circulation channel is formed in the bottom of the filter cylinder, and a water outlet hole communicated with the water purification port and the through hole is formed in the end cover.

Further, the core still seals the center tube between with lower extreme including the installation at upper end, rearmounted filter media suit is in the center tube outside, the center tube with the through-hole intercommunication, be equipped with a plurality of first water holes of crossing on the pipe wall of center tube, the aperture axial in first water hole upwards crescent.

Furthermore, the central tube and the upper end seal are integrally formed, a positioning boss is arranged at the top of the lower end seal, and the central tube is sleeved and fixed on the outer side of the positioning boss.

Furthermore, the core still includes the suit in the sleeve outside the rearmounted filter media, be equipped with a plurality of second on the telescopic section of thick bamboo wall and cross the water hole, the aperture axial in second cross the water hole upwards crescent gradually.

The utility model has the advantages that:

the utility model discloses a when composite filter element used, the raw water flowed to leading filter core department through the raw water passageway, radially permeates and gets into in the first central aperture behind the leading filter media, and the axial flow is to the bottom passageway that the core lower extreme sealed afterwards to by bottom passageway axial flow to the lateral part passageway in, then radial infiltration postposition filter media gets into in the second central aperture, pass the through-hole at last and discharge by the water purification mouth. Therefore, the outer peripheral side of the rear filter material is the water passing surface by prolonging the waterway path, and compared with the prior art that the end surface of the rear filter material is the water passing surface, the water passing area of the utility model is larger, so the filtering effect is better; furthermore, the utility model provides a water flows to the in-process of lateral part passageway again behind the bottom passageway that first centre bore flow direction core lower extreme sealed, and the flow direction of water has carried out twice change, has effectively reduced the velocity of flow of water from this, makes its ability slowly radial infiltration rearmounted filter media to this further promotes the filter effect.

A plurality of supporting convex ribs which are distributed radially are arranged between the bottom surface of the lower end seal and the inner bottom wall of the filter shell, and a bottom channel is formed between every two adjacent supporting convex ribs. So design can make the bottom that the lower extreme seals and strain and have the clearance between the interior diapire of shell to avoid the lower extreme to seal the hole of straining shell bottom and first centre bore intercommunication, can also guide the periphery side of water uniform flow to rearmounted filter media simultaneously, in order to improve the utilization ratio of rearmounted filter media.

The supporting convex ribs and the lower end seal body are processed and molded. By the design, the assembling procedures can be reduced, the assembling efficiency is improved, and the supporting convex ribs and the lower end seal body can be integrally molded, so that the difficulty of the integral processing and molding of the supporting convex ribs and the lower end seal body can be reduced.

A plurality of water passing notches are uniformly arranged on the peripheral side of the lower end seal at intervals in the circumferential direction. By the design, the material cost can be reduced, and the water in the bottom channel can be accelerated to flow into the side channel, so that the filtering efficiency is improved.

The inner side wall of the filter shell is provided with a positioning slot, and the upper end of the filter shell is provided with a positioning bulge inserted in the positioning slot. So design, can avoid the core to take place to rotate in straining the shell under the impact of water.

The distance between the bottom surface of the positioning slot and the inner bottom wall of the filter shell is H1, the distance between the bottom surface of the positioning protrusion and the bottom sealing surface of the lower end is H2, and H1 is larger than H2, so that a bottom channel is formed between the bottom sealing surface of the lower end and the inner bottom wall of the filter shell. By the design, the design of supporting the convex ribs can be omitted, and the structure is simpler.

The filter shell comprises a filter cylinder and an end cover arranged at one end of the filter cylinder, a water inlet hole communicated with the first central hole and the bottom circulation channel is formed in the bottom of the filter cylinder, and a water outlet hole communicated with the water purifying port and the through hole is formed in the end cover. So design, can be convenient for the core assemble to straining in the shell.

The core still seals the center tube between the lower extreme including the installation at upper end, and rearmounted filter media suit is in the center tube outside, center tube and through-hole intercommunication, is equipped with a plurality of first water holes of crossing on the pipe wall of center tube, and the aperture axial in first water hole of crossing upwards crescent. By the design, the central pipe can play a role in positioning for mounting the rear filter material, and the phenomenon that the rear filter material is locally broken due to radial compression deformation during assembly is avoided; in addition, the aperture of the first water passing hole is gradually increased upwards in the axial direction, so that the utilization rate of the upper part of the rear filter material can be improved.

The central tube and the upper end seal are integrally formed, the top of the lower end seal is provided with a positioning boss, and the central tube is sleeved and fixed on the outer side of the positioning boss. By the design, the assembling steps can be effectively reduced, the central tube and the positioning boss can be sleeved and fixed after the rear filter material is sleeved on the outer side of the central tube, the assembling difficulty of the rear filter material is reduced, and the assembling efficiency of the core is improved.

The core still includes the sleeve of suit in the rear filter media outside, is equipped with a plurality of second on the telescopic section of thick bamboo wall and crosses the water hole, and the aperture axial in second water hole is upwards crescent. By adopting the design, the rear filter material can be uniformly distributed between the central tube and the sleeve when the folding membrane is adopted, so that the filtering uniformity is ensured; in addition, the aperture of the second water passing hole is gradually increased upwards in the axial direction, so that the utilization rate of the upper part of the rear filter material can be further improved.

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 schematic view of a composite filter element according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of a composite filter element according to a first embodiment of the present invention;

fig. 3 is an exploded schematic view of a core body according to an embodiment of the present invention;

fig. 4 is a schematic bottom structure view of a lower end seal according to a first embodiment of the present invention;

fig. 5 is a cross-sectional view of a composite filter element in an embodiment of the present invention.

Reference numerals:

100. a housing; 101. a housing; 102. a cover body; 103. a water purifying port; 200. a raw water channel; 300. a front filter element; 310. pre-filtering the material; 311. a first central aperture; 312. front upper end sealing; 313. sealing the front lower end; 400. a post-positioned filter element; 410. a filter shell; 411. a filter cartridge; 4111. a water inlet hole; 412. an end cap; 4121. a water outlet hole; 420. a core body; 421. a post-filter material; 4211. a second central aperture; 422. sealing the upper end; 4221. a through hole; 4222. positioning the projection; 423. sealing the lower end; 4231. a water passing notch; 4232. positioning the boss; 424. a central tube; 4241. a first water through hole; 425. a sleeve; 4251. a second water through hole; 500. a bottom channel; 600. a side channel; 700. and supporting the convex ribs.

Detailed Description

The utility model provides a filter and carry compound filter core of effect, including shell and the filter element group spare of installation in the shell, the shell is equipped with water inlet and water purification mouth, filter element group spare with form between the shell inner wall with the raw water passageway of water inlet intercommunication, filter element group spare includes leading filter core and the rearmounted filter core of installation in leading filter core low reaches, leading filter core includes the leading filter media who is equipped with first centre bore, rearmounted filter core includes filter shell and installs the core in filter shell, the core includes the rearmounted filter media who is equipped with the second centre bore and installs the upper end seal and the lower end seal at rearmounted filter media both ends, the upper end seal with filter shell inner wall sealing connection, the upper end seal be equipped with the through-hole of intercommunication second centre bore with the water purification mouth, be formed with between lower end seal bottom and the filter shell inner bottom wall and communicate the bottom passageway of first centre bore, a side passage is formed between the periphery of the core body and the side wall of the filter shell.

The utility model discloses a when composite filter element used, the raw water flowed to leading filter core department through the raw water passageway, radially permeates and gets into in the first central aperture behind the leading filter media, and the axial flow is to the bottom passageway that the core lower extreme sealed afterwards to by bottom passageway axial flow to the lateral part passageway in, then radial infiltration postposition filter media gets into in the second central aperture, pass the through-hole at last and discharge by the water purification mouth. Therefore, the outer peripheral side of the rear filter material is the water passing surface by prolonging the waterway path, and compared with the prior art that the end surface of the rear filter material is the water passing surface, the water passing area of the utility model is larger, so the filtering effect is better; furthermore, the utility model provides a water flows to the in-process of lateral part passageway again behind the bottom passageway that first centre bore flow direction core lower extreme sealed, and the flow direction of water has carried out twice change, has effectively reduced the velocity of flow of water from this, makes its ability slowly radial infiltration rearmounted filter media to this further promotes the filter effect.

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 4, the composite filter element in this embodiment includes a housing 100 and a filter element assembly installed in the housing 100, in order to reduce an assembly process and facilitate installation of the filter element assembly in the housing 100, the housing 100 in this embodiment includes a housing 101 having an open end and a cover 102 covering the open end of the housing 101, the housing 100 is provided with a water inlet (not shown) and a water purification port 103, a raw water channel 200 communicating with the water inlet is formed between the filter element assembly and an inner wall of the housing, the filter element assembly includes a front filter element 300 and a rear filter element 400 installed downstream of the front filter element 300, the front filter element 300 includes a front filter element 310 having a first central hole 311, the front filter element 310 is an activated carbon membrane, an RO membrane, an ultrafiltration membrane, or PP wool, the rear filter element 400 includes a filter housing 410 and a core body 420 installed in the filter housing 410, the core body 420 includes a rear filter element 421 having a second central hole 4211, and an upper end seal 422 and a lower end seal 423, a sealing ring is arranged between the upper end seal 422 and the inner wall of the filter shell to realize the sealing connection between the upper end seal 422 and the filter shell, the upper end seal 422 is provided with a through hole 4221 for communicating the second central hole 4211 with the water purifying port 103, a bottom passage 500 for communicating the first central hole 311 is formed between the bottom of the lower end seal 423 and the inner bottom wall of the filter shell, and a side passage 600 is formed between the peripheral side of the core body 420 and the side wall of the filter shell.

When the composite filter element of the embodiment is used, raw water enters the raw water channel 200 through the water inlet and flows downwards to the front filter element 300, radially permeates the front filter material 310 and then flows into the first central hole 311, then axially flows upwards to the bottom channel 500 with the lower end sealed, and axially flows into the side channel 600 through the bottom channel 500, then radially permeates the rear filter material 421 and enters the second central hole 4211, and finally passes through the through hole 4221 and is discharged from the water purifying port 103. As can be seen from this, in the present embodiment, since the outer peripheral side of the post-filter 421 is made to be the water passing surface by extending the water passage path, the water passing area is larger in the present embodiment than the water passing surface at the end face of the post-filter in the related art, and therefore the filtering effect is better; in addition, in the process that water flows to the bottom channel 500 of the core body lower end seal through the first center hole 311 and then flows to the side channel 600, the flow direction of the water is changed twice, so that the flow rate of the water is effectively reduced, the water can slowly and radially permeate the post-filter 421, and the filtering effect is further improved.

Specifically, the front filter element 300 in this embodiment further includes a front upper end seal 312 and a front lower end seal 313 installed at two ends of the front filter element 310, the front lower end seal 313 is provided with a support tube inserted and positioned at the bottom of the housing, the front lower end seal 313 seals the bottom end of the first central hole 311 and the bottom end of the front filter element 310, the front upper end seal 312 seals the top end of the front filter element 310, and the front upper end seal 312 is provided with a water outlet tube communicated with the first central hole 311. The filter shell 410 comprises a filter cartridge 411 and an end cover 412 which is hermetically installed at one end of the filter cartridge 411, in the embodiment, the end cover 412 can be melted or welded on the filter cartridge 411 in a rotating mode, a water inlet hole 4111 which is communicated with a water outlet pipe and a bottom channel 500 is formed in the bottom of the filter cartridge 411, a water outlet hole 4121 which is communicated with a water purifying port 103 and a through hole 4221 is formed in the end cover 412, and the filter shell 410 is formed by later assembling the filter cartridge 411 and the end cover 412 which are formed in a split mode, so that the core body 420 can be conveniently assembled in the filter shell 410, and the assembling difficulty.

Preferably, in this embodiment, a plurality of radially distributed supporting ribs 700 are disposed between the bottom surface of the lower end seal 423 and the inner bottom wall of the filter housing (i.e., the inner bottom wall of the filter cartridge), for example, 2, 3, 4, and the supporting ribs 700 are in the form of a bar, and a bottom channel 500 is formed between two adjacent supporting ribs 700, so that a gap exists between the bottom surface of the lower end seal 423 and the inner bottom wall of the filter housing, so as to prevent the lower end seal 423 from closing the water inlet hole 4111, and meanwhile, the supporting ribs 700 can also guide water to uniformly flow to the outer peripheral side of the rear filter medium 421, so as to improve the utilization rate of the rear filter medium 421.

In order to reduce the assembly steps and improve the assembly efficiency, the support rib 700 and the lower end seal 423 in the present embodiment are integrally formed, so that the difficulty of integrally forming the support rib 700 and the lower end seal 423 can be reduced.

It will be appreciated that the support ribs may also be integrally formed on the inner bottom wall of the filter cartridge.

It can be understood that the supporting ribs can also be block-shaped bulges or point-shaped bulges which are uniformly distributed between the bottom sealing surface of the lower end and the inner bottom wall of the filter shell at intervals in the circumferential direction, and the supporting ribs and the bottom sealing surface of the lower end or the inner bottom wall of the filter cartridge are integrally formed.

In addition, in order to prevent the core 420 from rotating in the filter housing 410 under the impact of water, in this embodiment, a positioning slot is provided on the inner side wall of the filter housing, a positioning protrusion 4222 inserted into the positioning slot is provided on the upper end seal 422, and circumferential limitation of the core 420 can be realized by the cooperation of the positioning slot and the positioning protrusion 4222, so as to prevent the core 420 from rotating in the filter housing 410 under the impact of water, prevent the core 420 from shaking when the end cap 412 and the filter cartridge 411 are melted by rotation, and prevent the core 420 from being pressed and moved downward when the end cap 412 and the filter cartridge are welded.

In other embodiments of the utility model, the distance between the bottom surface of location slot and the interior diapire of straining the shell is H1, and the distance of the bellied bottom surface of location and lower extreme sealing surface is H2, satisfies H1 > H2 to form the bottom passageway between messenger's lower extreme sealing surface and the interior diapire of straining the shell. By the design, the design of supporting the convex ribs can be omitted, and the structure is simpler.

It is understood that, in the case of satisfying H1 > H2, the supporting ribs can be provided at the same time to guide the flow of water.

In addition, in the embodiment, a plurality of water passing notches 4231 are uniformly arranged at intervals in the circumferential direction on the outer circumferential side of the lower end seal 423. By adopting the design, the material cost can be reduced, and the water in the bottom channel 500 can be accelerated to flow into the side channel 600, so that the filtering efficiency is improved.

Finally, the core 420 in this embodiment further includes a central tube 424 installed between the upper end seal 422 and the lower end seal 423, the post filter 421 is a folded membrane or a carbon membrane sleeved outside the central tube 424, preferably, the folded membrane in this embodiment, the upper end of the central tube 424 is communicated with the through hole 4221, and the lower end of the central tube 424 is sealed by the lower end seal 423. The central tube 424 is provided with a plurality of rows of first water through holes 4241 axially spaced from each other on the wall thereof, so that water filtered by the post-filter 421 can enter the central tube 424 through the first water through holes 4241. By the design, the central tube 424 can play a positioning role in mounting the rear filter material 421, and local fracture caused by radial compression deformation during assembly of the rear filter material 421 is avoided; in addition, the aperture of the first water passing hole 4241 gradually increases upward in the axial direction, so that the utilization rate of the upper portion of the rear filter 421 can be improved.

In order to effectively reduce the assembly steps and improve the assembly efficiency, the central tube 424 and the upper end seal 422 in this embodiment are integrally formed, the top of the lower end seal 423 is provided with a positioning boss 4232, and when in assembly, after the rear filter material 421 is sleeved outside the central tube 424, the central tube 424 is sleeved outside the positioning boss 4232 and is bonded and fixed or welded and fixed by hot melt adhesive, so that the assembly difficulty of the rear filter material 421 is reduced, and the assembly efficiency of the core body 420 is improved.

It can be understood that the central tube can be integrally formed with the lower end seal, the bottom of the upper end seal is provided with a positioning groove matched with the central tube, and the upper end of the central tube is inserted into the positioning groove and then is bonded or welded with the upper end seal.

It can be understood that the central tube, the upper end seal and the lower end seal can be formed separately, and when the central tube, the upper end seal and the lower end seal are assembled, two ends of the central tube are fixed with the upper end seal and the lower end seal respectively in a bonding or welding mode.

In order to ensure the uniformity of the circumferential distribution of the folded film, the core 420 in this embodiment further includes a sleeve 425 sleeved outside the rear filter 421, the sleeve 425 may be integrally formed with one of the second upper end seal 422 and the second lower end seal 423 and bonded or welded to the other, or may be separately formed with the second upper end seal 422 and the second lower end seal 423 and then both ends are bonded or welded between the second upper end seal 422 and the second lower end seal 423. The wall of the sleeve is provided with a plurality of rows of second water through holes 4251 axially spaced from each other, so that the water in the side channel 600 can flow to the rear filter 421 through the second water through holes 4251. In addition, the aperture of the second water passing hole 4251 in the present embodiment gradually increases upward in the axial direction, so that the utilization rate of the upper portion of the rear filter 421 can be further improved.

It will be appreciated that the core may also include no central tube or sleeve, and that the ends of the trailing filter may be directly bonded to the upper and lower seals.

Example II,

As shown in fig. 5, the difference of this embodiment from the first embodiment is that no sleeve is provided outside the post-filter 421 in this embodiment.

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. A composite filter element with improved filtering effect comprises a shell and a filter element assembly arranged in the shell, wherein the shell is provided with a water inlet and a water purifying port, a raw water channel communicated with the water inlet is formed between the filter element assembly and the inner wall of the shell, the filter element assembly comprises a front filter element and a rear filter element arranged at the downstream of the front filter element, the front filter element comprises a front filter element with a first central hole, and the composite filter element is characterized in that the rear filter element comprises a filter shell and a core body arranged in the filter shell, the core body comprises a rear filter element with a second central hole and an upper end seal and a lower end seal arranged at the two ends of the rear filter element, the upper end seal is hermetically connected with the inner wall of the filter shell, the upper end seal is provided with a through hole communicated with the second central hole and the water purifying port, a bottom channel communicated with the first central hole is formed between the bottom wall of the lower end seal and the inner, a side passage is formed between the periphery of the core body and the side wall of the filter shell.

2. The composite filter element of claim 1, wherein a plurality of radially extending support ribs are disposed between the bottom surface of the lower end seal and the inner bottom wall of the filter housing, and the bottom channel is defined between two adjacent support ribs.

3. The composite filter element of claim 2, wherein said support bead is integrally formed with said lower end seal.

4. The composite filter element of claim 1, wherein a plurality of water passing notches are circumferentially and uniformly spaced on the outer peripheral side of the lower end seal.

5. The composite filter element of claim 1, wherein the filter housing has positioning slots in the inner sidewall thereof, and the upper end seal has positioning protrusions inserted into the positioning slots.

6. The composite filter element of claim 5, wherein the distance between the bottom surface of the positioning slot and the inner bottom wall of the filter housing is H1, and the distance between the bottom surface of the positioning protrusion and the bottom end sealing surface is H2, which satisfies H1 > H2, so that the bottom channel is formed between the bottom end sealing surface and the inner bottom wall of the filter housing.

7. The composite filter element according to one of claims 1 to 6, wherein the filter shell comprises a filter cartridge and an end cap mounted at one end of the filter cartridge, the bottom of the filter cartridge is provided with a water inlet hole communicating the first central hole and the bottom channel, and the end cap is provided with a water outlet hole communicating the water purifying nozzle and the through hole.

8. The composite filter element according to one of claims 1 to 6, wherein the core further comprises a central tube installed between the upper end seal and the lower end seal, the rear filter material is sleeved outside the central tube, the central tube is communicated with the through hole, a plurality of first water through holes are formed in the tube wall of the central tube, and the hole diameter of each first water through hole is gradually increased in the axial direction.

9. The composite filter element of claim 8, wherein the central tube is integrally formed with the upper end seal, and a positioning boss is provided on the top of the lower end seal, and the central tube is fixed outside the positioning boss in a sleeving manner.

10. The composite filter element of claim 1, wherein the core further comprises a sleeve sleeved outside the rear filter material, the wall of the sleeve is provided with a plurality of second water through holes, and the diameter of the second water through holes is gradually increased in the axial direction.

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