CN210710985U - Composite filter element with good filtering effect - Google Patents

Abstract

The utility model discloses a composite filter element with good filtering effect, which solves the technical problems of high water passing speed and poor filtering effect of a post-filter element in the prior composite filter element, the composite filter element in the utility model 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 pre-filter element and a post-filter element arranged at the downstream of the pre-filter element, the pre-filter element comprises a pre-filter material provided with a first central hole, the post-filter element comprises a filter shell and a core body, the filter shell comprises a filter cavity and a buffer cavity positioned at the downstream of the filter cavity, the core body is arranged in the filter cavity and forms a circulation channel communicated with the first central hole between the walls of the filter cavity, the core body comprises a post-filter material provided with, the buffer cavity is communicated with the second central hole and the water purifying port.

Description

Composite filter element with good filtering effect

[ technical field ] A method for producing a semiconductor device

The utility model relates to a purifier technical field especially relates to a composite filter element that filter effect is good.

[ background of the invention ]

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-mentioned problem, composite filter should the subassembly fortune give birth to, present some composite filter on the market adopt the filter core with two kinds of materials to compound along composite filter's axial, the raw water filters the back axial through leading filter core and flows towards rearmounted filter core direction, the axial passes behind the rearmounted filter media in the rearmounted filter core by composite filter's water purification mouth direct discharge, so, just can lead to the water velocity through rearmounted filter core too fast, and then lead to the filter effect of rearmounted filter core relatively poor.

[ Utility model ] content

The utility model aims to solve the technical problem that overcome prior art not enough and provide a composite filter that the filter effect is good, can effectively reduce the velocity of flow of water flow through rearmounted filter core to this promotes the filter effect.

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

the utility model provides a composite filter element that filter effect is good, includes shell and the filter element group spare of installation in the shell, the shell is equipped with water inlet and water purification mouth, the filter element group spare with form between the shell inner wall with the raw water passageway of water inlet intercommunication, the filter element group spare include leading filter core and install the rearmounted filter core in leading filter core low reaches, leading filter core is including the leading filter media that is equipped with first centre bore, rearmounted filter core is including filter shell and core, filter shell includes filter chamber and the cushion chamber that is located filter chamber low reaches, the core is installed in the filter chamber and with form between the filter chamber wall with the circulation passageway of first centre bore intercommunication, the core is including the rearmounted filter media that is equipped with the second centre bore, the cushion chamber intercommunication the second centre bore with the water purification mouth.

Furthermore, the filter shell comprises a filter cylinder and an end cover which is hermetically installed at one end of the filter cylinder, the filter cavity is formed inside the filter cylinder, a water inlet hole which is communicated with the first central hole and the circulation channel is formed in the bottom of the filter cavity, the end cover is provided with the buffer cavity and a water outlet hole which is communicated with the water purifying port, and the buffer cavity is communicated with the water outlet hole and the second central hole.

Furthermore, the filter shell comprises a filter cylinder and an end cover which is hermetically installed at one end of the filter cylinder, the filter cavity is formed inside the filter cylinder, a water inlet hole which is communicated with the first center hole and the circulation channel is formed in the bottom of the filter cavity, a concave cavity which is communicated with the second center hole is formed in one side, facing the end cover, of the core body, and the buffer cavity is formed between the end cover and the bottom wall of the lower concave cavity.

Furthermore, an upper concave cavity protruding upwards is arranged on the end cover, and the upper concave cavity and the lower concave cavity are matched to form the buffer cavity.

Furthermore, a water inlet nozzle which is arranged around the water inlet hole and extends downwards is arranged at the bottom of the filter cylinder, the front filter element further comprises a first upper end seal arranged at the top of the front filter material, a water outlet pipe which extends upwards and abuts against the bottom of the filter shell is arranged at the first upper end seal, and the water outlet pipe is hermetically sleeved with the water inlet nozzle and is communicated with the first center hole.

Furthermore, the top of the end cover is provided with a water outlet nozzle which is arranged around the water outlet hole and extends upwards, and the inside of the shell is provided with an annular positioning rib which is in sealing fit with the water outlet nozzle.

Furthermore, an annular inserting plate which is downwards inserted into the filter cylinder is arranged on the end cover, and a sealing element is arranged between the annular inserting plate and the core body, so that the part of the core body below the sealing element and the wall of the filter cavity form the flow passage.

Further, the core is including installing the second upper end seal and the second lower end seal at rearmounted filter media both ends, the second upper end seal with filter chamber wall sealing connection, the second upper end seal is equipped with the intercommunication the through-hole of cushion chamber and second centre bore, the circulation passageway includes lateral part passageway and the bottom passageway that communicates with first centre bore, form between second lower end seal bottom and the filter chamber diapire the bottom passageway, core week side with form between the filter chamber lateral wall the lateral part passageway.

Furthermore, the core body comprises a central tube arranged between the second upper end seal and the second lower end seal, the rear filter material is a folding membrane sleeved on the outer side of the central tube, and a first water passing hole is formed in the central tube.

Furthermore, the core body further comprises a sleeve sleeved outside the rear filter material, and a plurality of second water through holes are formed in the wall of the sleeve.

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 centre bore behind the leading filter media, and in axial flow to the circulation passageway of filter chamber afterwards, radially permeates the rearmounted filter media and get into in the second centre bore, gets into at last behind the cushion chamber and discharges by the water purification mouth. The utility model provides a water gets into the great buffer chamber of sectional area back by the second centre bore, because the increase of buffer chamber sectional area, consequently under the unchangeable circumstances of discharge, the velocity of flow of water can reduce, so just can lead to the velocity of flow of the leading-end flow through rearmounted filter media also to reduce for the impurity of rearmounted filter media can abundant drainage promotes the filter effect.

The filter shell comprises a filter cylinder and an end cover which is hermetically installed at one end of the filter cylinder, a filter cavity is formed inside the filter cylinder, a water inlet hole communicated with a first center hole and a circulation channel is formed in the bottom of the filter cavity, a buffer cavity and a water outlet hole communicated with a water purification port are formed in the end cover, and the buffer cavity is communicated with the water outlet hole and a second center hole. By the design, the volume of the conventional filter cavity can not be influenced, so that the water passing area and the filtering effect of the rear filter material are ensured; meanwhile, only the existing end cover structure is required to be modified, and the volume of the buffer cavity can be increased by increasing the bulge height of the end cover according to needs.

The filter shell comprises a filter cylinder and an end cover which is hermetically arranged at one end of the filter cylinder, a filter cavity is formed in the filter cylinder, a water inlet hole which is communicated with a first central hole and a circulation channel is formed in the bottom of the filter cavity, a concave cavity communicated with a second central hole is formed in one side, facing the end cover, of the core body, and a buffer cavity is formed between the end cover and the bottom wall of the concave cavity. By the design, the existing filter shell can be prevented from being structurally transformed, and the concave cavity is machined on one side of the core body facing the end cover, so that the filter shell is simple and convenient to machine.

The bottom of straining a section of thick bamboo is equipped with around the inlet opening setting and the water inlet nozzle that downwardly extending formed, and leading filter core still seals including the first upper end of installing at leading filter media top, and first upper end seals to be equipped with upwards extends and supports and lean on the outlet pipe of straining the shell bottom, and the outlet pipe is sealed suit with the inlet nozzle to communicate with first centre bore. So design can avoid straining a junction emergence leakage that section of thick bamboo and first upper end sealed, can effectively support straining the shell through the outlet pipe again to prevent to strain shell axial downstream, also need not to set up other structures alone simultaneously and fix the axial position of straining the shell in the shell, consequently the structure is simpler.

The top of the end cover is provided with a water outlet nozzle which is arranged around the water outlet hole and extends upwards, and the inside of the shell is provided with an annular positioning rib which is hermetically sleeved with the water outlet nozzle. By the design, the upper end and the lower end of the filter shell can be radially positioned through the annular positioning ribs and the water outlet pipe, so that the smoothness of a raw water channel is ensured.

The end cover is provided with an annular inserting plate which is downwards inserted into the filter cylinder, and a sealing element is arranged between the annular inserting plate and the core body, so that a flow passage is formed between the part of the core body below the sealing element and the wall of the filter cavity. By the design, the installation reliability of the end cover and the filter cylinder can be improved, and the structural strength of the end cover can be enhanced.

The core seals the center tube between with the second lower extreme including installing at the second upper end, and rearmounted filter media is the folding film of suit in the center tube outside, is equipped with first water hole of crossing on the center tube. 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 arrangement of the first water passing hole enables the filtered pure water to enter the interior of the central tube and flow to the buffer cavity.

The core body further comprises a sleeve sleeved outside the rear filter material, and a plurality of second water passing holes are formed in the wall of the sleeve. By the design, the foldable membrane can be uniformly distributed between the central tube and the sleeve in the circumferential direction, so that the filtering uniformity is ensured; in addition, the arrangement of the second water passing hole enables water in the flow channel to enter the sleeve to radially permeate the post-filter material.

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

[ description of the 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; 104. an annular positioning rib; 200. a raw water channel; 300. a front filter element; 310. pre-filtering the material; 311. a first central aperture; 312. a first upper end seal; 313. a first lower end seal; 400. a post-positioned filter element; 410. a filter shell; 411. a filter chamber; 412. a buffer chamber; 413. a filter cartridge; 4131. a water inlet hole; 414. an end cap; 4141. a water outlet hole; 4142. an upper concave cavity; 4143. an annular inserting plate; 415. a water outlet nozzle 420 and a core body; 421. a post-filter material; 4211. a second central aperture; 422. a second upper end seal; 4221. a through hole; 4222. positioning the projection; 4223. a lower concave cavity; 423. a second lower end seal; 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. and supporting the convex ribs.

[ detailed description ] embodiments

The utility model provides a composite filter element that filter effect is good, including shell and the filter element group spare of installation in the shell, the shell is equipped with water inlet and water purification mouth, the filter element group spare with form between the shell inner wall with the raw water passageway of water inlet intercommunication, the filter element group spare includes leading filter core and installs the rearmounted filter core in leading filter core low reaches, leading filter core is including the leading filter media that is equipped with first centre bore, rearmounted filter core is including filter shell and core, the filter shell includes the filter chamber and is located the buffer chamber in filter chamber low reaches, the core is installed in the filter cavity and with form between the filter chamber wall with the circulation passageway of first centre bore intercommunication, the core is including the rearmounted filter media that is equipped with the second centre bore, the buffer chamber intercommunication the second centre bore with the water purification mouth.

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 centre bore behind the leading filter media, and in axial flow to the circulation passageway of filter chamber afterwards, radially permeates the rearmounted filter media and get into in the second centre bore, gets into at last behind the cushion chamber and discharges by the water purification mouth. The utility model provides a water gets into the great buffer chamber of sectional area back by the second centre bore, because the increase of buffer chamber sectional area, consequently under the unchangeable circumstances of discharge, the velocity of flow of water can reduce, so just can lead to the velocity of flow of the leading-end flow through rearmounted filter media also to reduce for the impurity of rearmounted filter media can abundant drainage 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 the assembly process and facilitate the installation of the filter element assembly in the housing 100, the housing 100 in this embodiment includes a casing 101 with an open end and a cover 102 covering the open end of the casing 101, the housing 100 is provided with a water inlet (not shown) and a water purifying port 103, a raw water channel 200 communicating with the water inlet is formed between the filter element assembly and the 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 or RO membrane or ultrafiltration membrane or PP wool, the rear filter element 400 includes a filter shell 410 and a core body 420, the filter shell 410 includes a filter cavity 411 and a buffer cavity 412 located downstream of the, the core body 420 is arranged in the filter cavity 411 and forms a circulation channel communicated with the first central hole 311 with the wall of the filter cavity, the core body 420 comprises a rear filter material 421 provided with a second central hole 4211, and the buffer cavity 412 is communicated with the second central hole 4211 and the water purifying port 103.

When the composite filter element of the embodiment is used, raw water enters the raw water channel 200 through the water inlet and flows to the front filter element 300, radially permeates the front filter material 310 and then enters the first central hole 311, then axially flows upwards to the flow channel of the filter cavity 411, radially permeates the rear filter material 421 and enters the second central hole 4211, and finally enters the buffer cavity 412 and then is discharged through the water purifying port 103. The utility model provides a water gets into the great cushion chamber 412 of sectional area back by second centre bore 4211, because the increase of cushion chamber 412 sectional area, consequently under the unchangeable circumstances of discharge, the velocity of flow of water can reduce, so just can lead to the velocity of flow of the leading end through rearmounted filter media 421 also to reduce for rearmounted filter media 421 can fully filter the impurity of water, promote the filter effect.

Specifically, the core body 420 in this embodiment includes a second upper end seal 422 and a second lower end seal 423 that are installed at two ends of the rear filter material 421, and a sealing member is provided between the second upper end seal 422 and the wall of the filter chamber to realize the sealing connection therebetween, and the sealing member is a sealing ring. The second upper end seal 422 is provided with a through hole 4221 communicating the buffer cavity 412 with the second central hole 4211, a part of the core body 420 below the sealing element forms a flow passage with the wall of the filter cavity, the flow passage comprises a side passage and a bottom passage communicated with the first central hole 311, the bottom passage is formed between the bottom of the second lower end seal 423 and the bottom wall of the filter cavity, and the side passage is formed between the part of the core body peripheral side below the sealing element and the side wall of the filter cavity, so that water filtered by the pre-filter material 310 enters the bottom passage through the first central hole 311, then flows into the side passage, and radially permeates the post-filter material 421 and then enters the buffer cavity 412 through the second central hole 4211.

The filter housing 410 of the present embodiment includes a filter cartridge 413 and an end cap 414 sealingly mounted at one end of the filter cartridge 413, the end cap 414 is rotatably welded to the filter cartridge 413, the end cap 414 is provided with an annular insert plate 4143 downwardly inserted into the filter cartridge 413, and the above-mentioned sealing member is provided between the annular insert plate 4143 and the second upper end seal 422, so that a flow passage is formed between a portion of the core below the sealing member and the wall of the filter chamber. The filter cartridge 413 is internally provided with the filter cavity 411, the bottom of the filter cavity 411 is provided with a water inlet 4131 communicated with the first central hole 311 and the flow channel, one side of the core body 420 facing the end cover 414 is provided with a lower concave cavity 4223 communicated with the second central hole 4211, namely, one side of the second upper end seal 422 facing the end cover 414 is provided with the lower concave cavity 4223, the end cover 414 is provided with an upper concave cavity 4142 which is raised upwards and a water outlet 4141 communicated with the upper concave cavity 4142, the water outlet 4141 is communicated with the water purifying port 103, the cross-sectional area of the upper concave cavity 4142 is equal to that of the lower concave cavity 4223, and the upper concave cavity 4142 and the lower concave cavity 4223 are.

It can be understood that the end cover can also be of a flat plate structure, namely, the upper concave cavity is not arranged, and the lower concave cavity forms the buffer cavity, so that the structural transformation of the existing filter shell can be avoided, and only the lower concave cavity needs to be processed on one side of the core body facing the end cover, and the processing is simple and convenient.

It can be understood that one side of the first upper end seal facing the end cover can be provided with no lower concave cavity, that is, the top surface of the first upper end seal is a plane, and the upper concave cavity arranged on the end cover forms the buffer cavity, so that the volume of the existing filter cavity can be unaffected, and the water passing area and the filtering effect of the rear filter material can be ensured; meanwhile, only the existing end cover structure is required to be modified, and the volume of the buffer cavity can be increased by increasing the bulge height of the end cover according to needs.

It will be appreciated that the height of the filter cartridge may also be greater than the height of the core, such that when the core is installed inside the filter cartridge, the cavity inside the filter cartridge above the core is a buffer cavity, and the cavity inside the filter cartridge corresponding to the core is a filter cavity.

In addition, in this embodiment, a plurality of radially distributed supporting ribs 500, for example, 2, 3, 4, are disposed between the bottom surface of the second lower end seal 423 and the inner bottom wall of the filter housing (i.e., the inner bottom wall of the filter cartridge), the supporting ribs 500 are strip-shaped, and a bottom channel is formed between two adjacent supporting ribs 500, so that a gap exists between the bottom surface of the second lower end seal 423 and the inner bottom wall of the filter housing, so as to prevent the second lower end seal 423 from closing the water inlet 4131 disposed at the bottom of the filter housing, and meanwhile, the supporting ribs 500 can 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 supporting ribs 500 and the second lower end seal 423 in the embodiment are integrally formed, so that the difficulty of integrally forming the two 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 protrusions or point-shaped protrusions which are uniformly distributed between the second lower end sealing surface and the inner bottom wall of the filter shell at intervals in the circumferential direction, and the supporting ribs and the second lower end sealing surface 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 disposed on the inner side wall of the filter housing, a positioning protrusion 4222 inserted into the positioning slot is disposed on the second upper end seal 422, and the positioning slot and the positioning protrusion 4222 are matched to realize circumferential limitation on the core 420, 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 414 and the filter cartridge 413 are melted by rotation, and prevent the core 420 from moving downward when the end cap 414 and the filter cartridge are welded.

In other embodiments of the present invention, the distance between the bottom surface of the positioning slot and the bottom wall of the filter casing is H1, the distance between the bottom surface of the positioning slot and the bottom wall of the second lower sealing surface is H2, which satisfies H1 > H2, so that the bottom channel is formed between the second lower sealing surface and the bottom wall of the filter casing. 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 this embodiment, a plurality of water passing notches 4231 are uniformly circumferentially arranged at intervals on the outer circumferential side of the second lower end seal 423. 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.

Secondly, in this embodiment, the bottom of the filter cartridge 413 is provided with a water inlet nozzle which is arranged around the water inlet hole 4131 and extends downward to form, the front filter element 300 further includes a first upper end seal 312 which is installed on the top of the front filter material 310 and a first lower end seal 313 which is installed on the bottom of the front filter material 310, the first lower end seal 313 is provided with a support pipe which is inserted and positioned on the bottom of the housing, the first lower end seal 313 seals the bottom end of the first central hole 311 and the bottom end of the front filter material 310, the first upper end seal 312 seals the top end of the front filter material 310, the top of the first upper end seal 312 is provided with a water outlet pipe which extends upward and is communicated with the first central hole 311, the water outlet pipe abuts against the bottom of the filter cartridge and is in sealing fit with the water inlet nozzle, that is. Therefore, leakage at the connection position of the filter cartridge 413 and the first upper end seal 312 can be avoided, the filter housing 410 can be effectively supported through the water outlet pipe to prevent the filter housing 410 from axially moving downwards, and other structures are not needed to be separately arranged to fix the axial position of the filter housing 410 in the housing 100, so that the structure is simpler.

To further position the filter housing 410, the top of the end cap 414 is provided with a nozzle 415 extending upwardly and surrounding the outlet hole 4141, and the interior of the housing is provided with an annular positioning rib 104 sealingly engaging the nozzle 415. By the design, the upper end and the lower end of the filter shell 410 can be radially positioned through the annular positioning rib 104 and the water outlet pipe, so that the smoothness of the raw water channel 200 is ensured.

Finally, the core 420 in this embodiment further includes a central tube 424 installed between the second upper end seal 422 and the second lower end seal 423, the post filter 421 is a folded film or a carbon film sleeved outside the central tube 424, in this embodiment, the folded film is preferred, 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 second 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 second upper end seal 422 in this embodiment are integrally formed, the top of the second lower end seal 423 is provided with a positioning boss 4232, and during 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 integrated with the second lower end seal, a positioning groove matched with the central tube is arranged at the bottom of the second upper end seal, and the upper end of the central tube is inserted into the positioning groove and then is bonded or welded with the second upper end seal.

It can be understood that the central tube, the second upper end seal and the second lower end seal can also be formed separately, and when the central tube, the second upper end seal and the second lower end seal are assembled, two ends of the central tube are fixed with the second upper end seal and the second 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 water in the side passage 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 not include a central tube and a sleeve, and the two ends of the post-filter may be directly bonded to the second upper end seal and the second lower end seal.

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. The utility model provides a composite filter element that filter effect is good, includes shell and the filter element group spare of installation in the shell, the shell is equipped with water inlet and water purification mouth, the filter element group spare with form between the shell inner wall with the raw water passageway of water inlet intercommunication, the filter element group spare includes leading filter core and the rearmounted filter core of installation in leading filter core low reaches, leading filter core is including the leading filter media that is equipped with first centre bore, a serial communication port, rearmounted filter core is including filter shell and core, the filter shell includes filter chamber and the cushion chamber that is located filter chamber low reaches, the core is installed in the filter chamber and with form between the filter chamber wall with the circulation passageway of first centre bore intercommunication, the core is including the rearmounted filter media that is equipped with the second centre bore, the cushion chamber intercommunication the second centre bore with the water purification mouth.

2. The composite filter element of claim 1, wherein the filter shell comprises a filter cylinder and an end cap hermetically mounted at one end of the filter cylinder, the filter cylinder forms the filter chamber inside, the bottom of the filter chamber is provided with a water inlet hole communicating the first central hole and the flow channel, the end cap is provided with the buffer chamber and a water outlet hole communicating with the clean water port, and the buffer chamber communicates the water outlet hole with the second central hole.

3. The composite filter element of claim 1, wherein said filter housing comprises a filter cartridge and an end cap sealingly attached to one end of said filter cartridge, said filter cartridge defining said filter chamber therein, said filter chamber having a bottom portion defining an inlet opening communicating between said first central opening and said flow passage, said core defining a recessed chamber on a side facing said end cap communicating with said second central opening, said end cap and said bottom wall of said recessed chamber defining said buffer chamber therebetween.

4. The composite filter element of claim 3, wherein said end cap defines an upwardly convex upper cavity, said upper cavity cooperating with said lower cavity to define said buffer chamber.

5. The composite filter element according to one of claims 2 to 4, wherein the bottom of the filter cartridge is provided with a water inlet nozzle which is arranged around the water inlet hole and extends downwards, the front filter element further comprises a first upper end seal which is arranged on the top of the front filter material, the first upper end seal is provided with a water outlet pipe which extends upwards and abuts against the bottom of the filter shell, and the water outlet pipe is sleeved with the water inlet nozzle in a sealing way and is communicated with the first central hole.

6. The composite filter element according to claim 2, wherein the top of the end cap is provided with a nozzle which is arranged around the water outlet hole and extends upwards, and the inside of the shell is provided with an annular positioning rib which is in sealing fit with the nozzle.

7. The composite filter element according to any one of claims 2 to 4, wherein said end cap is provided with an annular insert plate which is inserted downwardly into said filter cartridge, and wherein a sealing member is provided between said annular insert plate and said core body, so that said flow passage is formed between a portion of said core body located below said sealing member and said wall of said filter chamber.

8. The composite filter element according to one of claims 1 to 4, wherein the core includes a second upper end seal and a second lower end seal mounted at both ends of the post filter, the second upper end seal is connected with the wall of the filter chamber in a sealing manner, the second upper end seal is provided with a through hole communicating the buffer chamber with the second central hole, the circulation channel includes a side channel and a bottom channel communicating with the first central hole, the bottom channel is formed between the bottom of the second lower end seal and the bottom wall of the filter chamber, and the side channel is formed between the peripheral side of the core and the side wall of the filter chamber.

9. The composite filter element of claim 8, wherein the core comprises a central tube disposed between the second upper end seal and the second lower end seal, the post-filter is a folded membrane disposed on the outside of the central tube, and the central tube has a first water through hole.

10. The composite filter element of claim 9, wherein the core further comprises a sleeve fitted around the outer side of the post-filter, and a plurality of second water through holes are formed in the wall of the sleeve.

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