CN212327961U

CN212327961U - Membrane filtration assembly, composite filter element and water purifier system

Info

Publication number: CN212327961U
Application number: CN202021615549.9U
Authority: CN
Inventors: 申鸿海; 李友铃; 秦利利; 舒毅; 李冠轩; 林斯瀚
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-08-06
Filing date: 2020-08-06
Publication date: 2021-01-12
Anticipated expiration: 2030-08-06

Abstract

The utility model relates to a membrane filtration subassembly, combined filter core and purifier system, membrane filtration subassembly are including rolling up membrane center tube and diaphragm type filter layer, it includes rearmounted filter core and sets up to roll up the membrane center tube the end cover at rearmounted filter core both ends, the diaphragm type filter layer cover is in roll up on the membrane center tube, promote membrane filtration subassembly's integrated level and miniaturized degree. The axial length of the post-filter element is H1, the axial length of the membrane filter layer is H1, and H1/H1 is 30% -70%. On one hand, the filtering capacity of the post-positioned filter element can meet the requirement of further filtering water obtained by filtering through the membrane type filtering layer; on the other hand, the axial length of the rear filter element is reasonably controlled, so that the manufacturing cost of the membrane filtering component is effectively controlled.

Description

Membrane filtration assembly, composite filter element and water purifier system

Technical Field

The utility model relates to a water purification technical field especially relates to membrane filtration subassembly, composite filter and purifier system.

Background

With the development of the technology in the field of water purification, the miniaturization and integration of the water purifier become the main trend of development. The multi-stage filter element is mainly integrated and compounded together in the industrial design, so that the overall dimension of the water purifier is effectively reduced. And the design that integrates can reduce the quantity of renew cartridge in the purifier, improves the convenience of maintaining. However, in the process of realizing miniaturization and integration, it is important to reasonably control the manufacturing cost.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide a membrane filtration assembly, a composite filter element, and a water purification system, aiming at the problem that the manufacturing cost cannot be reasonably controlled in the process of realizing miniaturization and integration.

The membrane filtering assembly comprises a rolling membrane central tube and a membrane type filtering layer, wherein the rolling membrane central tube comprises a rear-mounted filter element and end covers arranged at two ends of the rear-mounted filter element, the membrane type filtering layer is sleeved on the rolling membrane central tube, the axial length of the rear-mounted filter element is H1, the axial length of the membrane type filtering layer is H1, and H1/H1 is 30% -70%.

According to the membrane filtering assembly, the membrane rolling central pipe is integrated in the membrane filtering layer, so that water obtained by filtering through the membrane filtering layer can enter the rear filter element for further filtering, and the integration level of the membrane filtering assembly is improved. Meanwhile, the proportional relation between the axial length H1 of the post-filter element and the axial length H1 of the membrane type filter layer is set to be that H1/H1 is 30-70%. On one hand, the filtering capacity of the post-positioned filter element can meet the requirement of further filtering water obtained by filtering through the membrane type filtering layer; on the other hand, the axial length of the rear filter element is reasonably controlled, so that the manufacturing cost of the membrane filtering component is effectively controlled. Specifically, comparing the water production capacity of the membrane filter layer with the production capacity of the rear filter element, the axial length H1 of the rear filter element is only required to be set to be 30% -70% of the axial length H1 of the membrane filter layer, and at the moment, the rear filter element can further filter all water obtained by filtering the membrane filter layer, so that the filtering requirement is met. The situations that the redundant quantity of the rear filter element is large and the utilization rate is low due to the fact that the axial length of the rear filter element is too long relative to the membrane type filter layer are avoided. Compared with the manufacturing cost of the end cover, the manufacturing cost of the rear filter element is high, the used material is brittle, and the strength is low, so that the axial length of the rear filter element is reduced, the axial length of the end cover is increased under the condition that the filtering requirement is met, the whole manufacturing cost can be reduced, the strength of the membrane rolling central tube is improved, and the stability is improved.

In one embodiment, a diversion groove is formed in the position, covered by the membrane type filter layer, of the outer peripheral surface of the end cover, and liquid in the diversion groove can flow into the post-filter element.

In one embodiment, the flow guide grooves are arranged along the axial direction of the membrane filter layer, the flow guide grooves are multiple, and the flow guide grooves are distributed at intervals in the circumferential direction of the outer peripheral surface of the end cover.

In one embodiment, the part of the outer circumferential surface of the end cap covered by the membrane filter layer comprises a water sealing area, the membrane filter layer is connected with the end cap at the water sealing area, and the diversion trench is positioned on one side of the water sealing area close to the post-positioned filter element.

In one embodiment, the end cover is provided with a flow guide hole, an inlet of the flow guide hole is positioned on the outer circumferential surface of the end cover and covered by the membrane type filter layer, and an outlet of the flow guide hole is positioned on the end surface of the end cover, which is in contact with the rear filter element.

In one embodiment, the rear filter element is a cylindrical structure, the end cover is provided with a through hole penetrating through two end faces, the through hole of the cylindrical structure is communicated with the through hole of the end cover to form a middle through hole of the membrane rolling central tube, a support frame is arranged in the rear filter element and is supported on the inner circumferential surface of the rear filter element, and the support frame is provided with water passing holes.

In one embodiment, the membrane filtration layer comprises a reverse osmosis membrane filtration layer rolled on the rolled membrane central tube;

or the membrane type filtering layer comprises a nanofiltration membrane filtering layer, and the nanofiltration membrane filtering layer is sleeved on the membrane rolling central pipe.

In one embodiment, the post-filter element comprises a carbon rod.

A composite filter element comprises the membrane filter component.

According to the composite filter element, by adopting the membrane filtering component in any embodiment, in the process of realizing miniaturization and integration, the manufacturing cost is effectively controlled under the condition of meeting the filtering requirement by reasonably controlling the proportional relation between the axial length of the rear filter element and the axial length of the membrane type filtering layer.

In one of them embodiment, composite filter still includes filter flask and leading filter element group spare, membrane filter element group spare with leading filter element group spare all is located in the filter flask, membrane filter element group spare with leading filter element group spare is in set gradually in the axial of filter flask, be equipped with raw water inlet and water purification delivery port on the filter flask, raw water inlet with leading filter element group spare intercommunication, process leading filter water that leading filter element group spare filters the acquisition can pass through in proper order membrane filter layer with trailing filter element filters and obtains the water purification, the water purification delivery port with the export intercommunication of roll membrane center tube.

In one embodiment, the composite filter element further comprises a front center pipe, one end of the filter flask, which is close to the membrane filtering component, is a first end, the raw water inlet and the purified water outlet are both located on the end face of the first end, a partition end cover is arranged in the filter flask, the space in the filter flask is divided into a first filtering cavity and a second filtering cavity, the front filter element component is located in the first filtering cavity, the membrane filtering component is located in the second filtering cavity, one end of the front center pipe is communicated with the raw water inlet, and the front center pipe sequentially penetrates through the membrane rolling center pipe and the partition end cover and then is inserted into the first filtering cavity.

In one embodiment, the composite filter element further comprises a guide central tube, the end face of the first end is further provided with a front filtering water outlet, a pressurizing water inlet and a concentrated water outlet, the splitting end cover is provided with a water passing jack, the front central tube is inserted into the water passing jack, the front central tube and the side wall of the water passing jack are arranged at intervals, the outer circumferential surface of the front filter element assembly and the side wall of the filter bottle are arranged at intervals to form a raw water gap, the front central tube is communicated with the raw water gap, the guide central tube is sleeved outside the front central tube, the guide central tube is positioned between the front central tube and the rolling membrane central tube, one end of the guide central tube is communicated with the water passing jack, the guide central tube and the front central tube are arranged at intervals to form a front filtering water gap, and the front filtering water outlet is communicated with the front filtering water gap, the membrane filtering assembly and the filter bottle and/or the segmentation end cover are arranged at intervals to form a pressurized water gap, the pressurized water gap is communicated between a raw water inlet and a pressurized water inlet of the membrane filtering layer, and the concentrated water outlet is communicated with a concentrated water outlet of the membrane filtering layer.

In one embodiment, the guide central tube and the membrane rolling central tube are arranged at intervals to form a purified water gap, and the purified water gap is communicated with the purified water outlet.

In one embodiment, an ultrafiltration membrane is arranged in the clean water gap and is intercepted between the post-filter element and the clean water outlet.

In one embodiment, leading filter element group spare one end with cut apart the end cover and support tightly, the leading filter element group spare other end is equipped with leading end cover, be equipped with on the leading end cover and run through the leading water hole of crossing of two terminal surfaces of leading end cover, preceding center tube with leading water hole intercommunication, be close to on the filter flask leading filter element group spare one end is the second end, leading end cover with be equipped with the clearance between the end wall of second end, make leading water hole with raw water clearance intercommunication.

A purifier system, includes foretell composite filter core.

According to the scheme, the water purifier system is provided, the composite filter element in any one of the embodiments is adopted, the integration level of the water purifier is improved, and meanwhile, the manufacturing cost of the water purifier is effectively controlled under the condition that the filtering requirement is met.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a front view of a membrane filtration module according to the present embodiment;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a cross-sectional view of the rolled membrane center tube of the present example;

FIG. 4 is a cross-sectional view taken along line B-B of FIG. 3;

FIG. 5 is a cross-sectional view of the rolled membrane center tube in another embodiment;

FIG. 6 is a front view of the composite filter element of the present embodiment;

FIG. 7 is a cross-sectional view taken along line C-C of FIG. 6;

FIG. 8 is a cross-sectional view of another embodiment of the composite filter element;

fig. 9 is an exploded view of the composite filter element of fig. 6;

FIG. 10 is a cross-sectional view of a composite filter element according to yet another embodiment;

FIG. 11 is a schematic view of the composite filter element of FIG. 10 after assembly of the spacer assembly and the pre-filter assembly;

FIG. 12 is a cross-sectional view of the spacer assembly and pre-filter cartridge of FIG. 11 assembled;

FIG. 13 is a cross-sectional view of another embodiment of the spacer assembly and pre-filter cartridge assembled;

fig. 14 is an exploded view of the composite filter element of fig. 10;

fig. 15 is a system diagram of a water purification system according to this embodiment;

fig. 16 is a system diagram of a water purifier system according to another embodiment.

Description of reference numerals:

10. a composite filter element; 11. a filter flask; 111. a first end; 1111. a raw water inlet; 1112. a front filtering water outlet; 1113. a pressurized water inlet; 1114. a concentrated water outlet; 1115. a purified water outlet; 112. a second end; 113. a raw water gap; 114. a pre-filtering water gap; 115. a pressurized water gap; 116. a water purification gap; 12. a pre-filter element assembly; 13. a front center tube; 14. end cover cutting; 141. a water passing jack; 15. guiding the central tube; 16. ultrafiltration membranes; 17. a front end cover; 171. a front water through hole; 18. a transfer sleeve; 19. a water sealing member; 20. a membrane filtration module; 21. rolling the membrane central tube; 211. a post-positioned filter element; 212. an end cap; 2121. a diversion trench; 22. a membrane filter layer; 221. a water sealing area; 23. a support frame; 231. water passing holes; 30. an isolation component; 31. a barrel; 311. a first flow guiding rib; 32. a cylinder cover; 40. a water purifier system; 41. a pressurizing passage; 411. a pressurized water pump; 412. a first solenoid valve; 42. a purified water passage; 421. a pressure sensing member; 422. a one-way valve; 43. an additional via; 44. a concentrated water passage; 441. a concentrated water electromagnetic valve; 45. a faucet.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

As shown in fig. 1 and 2, in one embodiment, a membrane filtration module 20 is provided comprising a rolled membrane center tube 21 and a membrane filtration layer 22. As shown in fig. 2 to 5, the membrane rolling center tube 21 includes a rear filter element 211 and end caps 212 disposed at both ends of the rear filter element 211. The membrane type filtering layer 22 is sleeved on the membrane rolling central tube 21, pure water obtained by filtering through the membrane type filtering layer 22 can reach the rear filter element 211 for further filtering, and the pure water obtained by further filtering through the rear filter element 211 can flow out of a middle through hole of the membrane rolling central tube 21.

The membrane filtration layer 22 and the post-filter element 211 are integrated together in the above sleeving manner to improve the integration level of the membrane filtration assembly 20, the end caps 212 at the two ends of the post-filter element 211 can also provide a force point for the arrangement of the membrane filtration layer 22, and when the membrane filtration layer 22 is sleeved on the membrane rolling central tube 21, the membrane filtration layer 22 is connected with the outer peripheral surface of the end cap 212.

Specifically, the membrane filtration layer 22 may be a reverse osmosis membrane filtration layer. The reverse osmosis membrane filter layer is rolled on the membrane rolling central pipe 21, and in the rolling process, the starting edge of the reverse osmosis membrane filter layer is connected with the outer peripheral surface of the end cover 212. Alternatively, the membrane filter layer 22 may also be a nanofiltration membrane filter layer, and the nanofiltration membrane filter layer is sleeved on the membrane rolling central pipe 21. The nanofiltration membrane filtering layer is connected with the peripheral surface of the end cover 212.

Specifically, as shown in fig. 2 and 3, a portion of the outer peripheral surface of the end cap 212 covered by the membrane filtration layer 22 includes a water seal region 221, and the membrane filtration layer 22 and the end cap 212 are connected at the water seal region 221, so that water filtered by the membrane filtration layer 22 can only flow to the post-filter element 211 for further filtration. Specifically, the membrane filter layer 22 and the end cap 212 may be adhesively attached.

Further, as shown in fig. 1 and 2, in one embodiment, the axial length of the post-filter element 211 is H1, the axial length of the membrane filter layer 22 is H1, and H1/H1 is 30% to 70%.

Compared with the case that two filter elements sleeved with each other in a common integrated filter element are basically the same in axial length, the axial length of the post-filter element 211 is set to be 30% -70% of the axial length of the membrane filter layer 22. On one hand, the filtering capacity of the post-filter element 211 can meet the requirement of further filtering the water obtained by filtering the membrane filtering layer 22; on the other hand, the axial length of the post-filter element 211 is reasonably controlled, so that the manufacturing cost of the membrane filter assembly 20 is effectively controlled. Specifically, comparing the water production capacity of the membrane filtration layer 22 with the production capacity of the post-filter element 211, only the axial length H1 of the post-filter element 211 needs to be set to be 30% -70% of the axial length H1 of the membrane filtration layer 22, and at this time, the post-filter element 211 can further filter all the water obtained by filtration of the membrane filtration layer 22, so as to meet the filtration requirement. The situation that the redundancy of the rear filter element 211 is large and the utilization rate is low due to the fact that the axial length of the rear filter element 211 is too long relative to the membrane filter layer 22 is avoided. Compared with the manufacturing cost of the end cover 212, the manufacturing cost of the rear filter element 211 is high, the used material is brittle, and the strength is low, so that under the condition of meeting the filtering requirement, the axial length of the rear filter element 211 is reduced, the axial length of the end cover 212 is increased, the whole manufacturing cost can be reduced, the strength of the membrane rolling central tube 21 is improved, and the stability is improved.

Further, as shown in fig. 3, in one embodiment, a diversion groove 2121 is provided on the outer peripheral surface of the end cap 212 at a position covered by the membrane filter layer 22, and the liquid in the diversion groove 212 can flow into the post-filter element 211.

So that the part of the membrane filter layer 22 covering the end cap 212 can flow to the post-filter element 211 through the diversion trench 2121 for further filtration. In other words, the membrane filtration layer 22 can generate water through the filtration function except for the portion opposite to the post-filter element 211, and the portion corresponding to the end cap 212 can also participate in the filtration process to guide out the filtered water, so as to improve the water generation flow rate of the membrane filtration layer 22. On the other hand, since the axial length of the end cap 212 is long, the membrane filter layer 22 covers the outer circumferential surface of the end cap 212 in a large amount, and the guide grooves 2121 are further provided to further fully utilize the water producing capacity of the membrane filter layer 22 at the portion, thereby preventing the excessive water from being discharged from the excessive portion of the membrane filter layer 22 and causing the excessive pressure holding. And then under the condition of fully balanced consideration of water production capacity, the cost is effectively controlled, and the water production flow of the whole membrane filtration assembly 20 is ensured.

Specifically, in one embodiment, the flow guide groove 2121 may extend to the surface of the end cap 212 contacting the rear filter element 211, based on the end cap 212 being disposed at the end of the rear filter element 211, and at least a partial surface of the end cap 212 contacting the rear filter element 211. For example, when the end surface of the end cap 212 abuts against the rear filter element 211, the flow guide groove 2121 extends to the end surface of the end cap 212 contacting the rear filter element 211. Thereby ensuring that the water in the guide groove 2121 can flow into the rear filter element 211.

Alternatively, when the end cap 212 is at least partially fitted over the rear filter element 211, the end face of the portion of the end cap 212 fitted over the rear filter element 211 may not directly interfere with the rear filter element 211, but may surround the rear filter element 211. However, since this end surface surrounds the rear filter element 211, water flowing out of this end surface in the guide groove 2121 can still enter the rear filter element 211, so that the guide groove 2121 can also extend to this end surface.

Specifically, as shown in fig. 4 and 5, an end surface of the end cap 212, which abuts against the rear filter element 211, is provided with an annular groove, and an end portion of the rear filter element 211 is inserted into the annular groove, so that the stability of installation between the end cap 212 and the rear filter element 211 is improved, and meanwhile, water in the flow guide groove 2121 on the outer circumferential surface of the end cap 212 is more likely to flow into the rear filter element 211 for further filtration.

In the embodiment shown in fig. 4 and 5, the end of the rear filter element 211 is cut so that the end of the rear filter element 211 can be inserted into the annular groove while the outer circumferential surface of the rear filter element 211 is flush with the outer circumferential surface of the end cap 212. At this time, the guide groove 2121 may extend to an end surface of the end cap 212, which abuts against the rear filter element 211.

If the radial thickness of the rear filter element 211 is the same as the thickness of the annular groove, in other words, the end of the rear filter element 211 is not cut, the rear filter element 211 can be directly inserted into the annular groove, and the outer diameter of the rear filter element 211 is smaller than the outer diameter of the end cap 212. The end surface of the end cap 212 surrounding the rear filter element 211 does not directly abut against the rear filter element 211, but the guide groove 2121 may extend to this end surface, and the water in the guide groove 2121 may flow into the rear filter element 211.

More specifically, in one embodiment, as shown in fig. 3, the flow guide grooves 2121 are arranged along the axial direction of the membrane filtration layer 22. The plurality of flow guide grooves 2121 are distributed at intervals in the circumferential direction of the outer circumferential surface of the end cover 212, and uniformly guide water formed by filtering each part in the circumferential direction of the membrane filter layer 22 surrounding the outer circumferential surface of the end cover 212 to the post-filter element 211, so that the overall water production flow is improved.

Further, in one embodiment, as shown in fig. 3, the guide grooves 2121 are provided on the outer peripheral surfaces of the two end caps 212. In other words, the membrane filter layer 22 covers the end caps 212 at the two ends of the post-filter element 211, and the two ends of the membrane filter layer 22 are respectively sleeved on the outer peripheral surfaces of the two end caps 212. Therefore, the rear filter element 211 is located between the two end covers 212 provided with the flow guide grooves 2121, and water to be filtered flows to the rear filter element 211 at both ends of the rear filter element 211, so that the filtering uniformity of the rear filter element 211 is high.

Specifically, the rear filter element 211 is a water-passing type microporous filter element, so that the water passing capacity of each position of the rear filter element 211 is relatively balanced, and compared with the situation that water passing is realized by arranging a water passing through hole on a central pipe generally, the water passing uniformity can be effectively improved by adopting the form of the water-passing type microporous filter element.

Further, in one embodiment, the post-filter element 211 comprises a carbon rod.

As shown in fig. 5, in an embodiment, the post-filter element 211 is a cylindrical structure, the end cap 212 is provided with through holes penetrating through two end faces, the through holes of the cylindrical structure are communicated with the through holes of the end cap 212 to form a middle through hole of the membrane rolling central tube 21, and purified water obtained by filtering by the post-filter element 211 flows out of the middle through hole. The rear filter element 211 is provided with a support frame 23, the support frame 23 is supported on the inner circumferential surface of the rear filter element 211, and the support frame 23 is provided with a water through hole 231. The support frame 23 is right the rearmounted filter core 211 plays the supporting role, avoids the outer pressure that receives of rearmounted filter core 211 is great, the condition that rearmounted filter core 211 damaged appears. Particularly, when the rear filter element 211 is the carbon rod, the carbon rod is a brittle material, the support frame 23 improves the pressure bearing capacity of the carbon rod, and the service life of the rear filter element 211 is effectively prolonged. The water holes 231 on the supporting frame 23 facilitate the purified water filtered by the post-filter element 211 to flow out.

Further, in one embodiment, as shown in fig. 1 to 3, the diversion trench 2121 is located at a side of the water sealing region 221 close to the post-filter element 211. The water sealing region 221 allows the water filtered by the portion of the membrane filter layer 22 corresponding to the guide groove 2121 to flow only to the post-filter element 211.

Further, in another embodiment, the end cap 212 is provided with a diversion hole, an inlet of the diversion hole is located on the outer circumferential surface of the end cap 212 at a position covered by the membrane filter layer 22, and an outlet of the diversion hole is located on an end surface of the end cap 212 contacting with the post-filter element 211.

Therefore, the part of the membrane filter layer 22 covering the outer peripheral surface of the end cover 212 can also participate in the process of filtering water, and the filtered water can flow to the post-filter element 211 through the flow guide holes and is further filtered by the post-filter element 211 to obtain purified water. Therefore, under the condition of reducing the axial length of the post-filter element 211, the cost is effectively controlled, and the water production capacity of the whole membrane filter assembly 20 is guaranteed.

Further, in yet another embodiment, as shown in fig. 6-10, a composite filter element 10 is provided, including the membrane filtration assembly 20 described above. By adopting the membrane filtration module 20 described in any of the above embodiments, in the process of miniaturization and integration, by reasonably controlling the proportional relationship between the axial length of the post-filter element 211 and the axial length of the membrane filtration layer 22, the manufacturing cost is effectively controlled while the filtration requirement is satisfied.

Specifically, in one embodiment, as shown in fig. 7-10, the composite filter element 10 further includes a filter flask 11 and a pre-filter element assembly 12, the membrane filter assembly 20 and the pre-filter element assembly 12 both being located in the filter flask 11. The membrane filtration module 20 and the pre-filter element assembly 12 may be arranged in sequence in the axial direction of the filter flask 11.

Specifically, the pre-filter assembly 12 may include a carbon rod, and a paper folding filter element is arranged outside the carbon rod; alternatively, the pre-filter cartridge assembly 12 comprises a pac (poly aluminum chloride) filter cartridge.

Further, as shown in fig. 6 to 8, a raw water inlet 1111 is provided on the filter flask 11. The raw water inlet 1111 is communicated with the pre-filter element assembly 12, and tap water can enter the filter flask 11 from the raw water inlet 1111 to reach the pre-filter element assembly 12 for pre-filtering. The pre-filtering water obtained by filtering through the pre-filtering core assembly 12 can be sequentially filtered through the membrane filtering layer 22 and the post-filtering core 211 to obtain purified water.

The filter bottle 11 is provided with a purified water outlet 1115, and the purified water outlet 1115 is communicated with the outlet of the membrane rolling central tube 21, so that purified water obtained after filtration by the post-filter element 211 flows to the purified water outlet 1115 from the outlet of the membrane rolling central tube 21 and then flows out of the composite filter element 10 for use by a user.

The front filter element assembly 12, the membrane type filter layer 22 and the rear filter element 211 are integrated in the filter bottle 11, so that the integration level of the composite filter element 10 is further improved.

Further, in one embodiment, as shown in fig. 7 and 8, a partition end cap 14 is provided in the filter flask 11 to partition the space in the filter flask 11 into a first filter chamber and a second filter chamber. The pre-filter assembly 12 is located in the first filter cavity and the membrane filter assembly 20 is located in the second filter cavity. As shown in fig. 8, a sealing member is provided between the dividing end cap 14 and the filter flask 11, so as to divide the space in the filter flask into a first filter chamber and a second filter chamber.

Alternatively, in another embodiment, as shown in fig. 10 to 13, an isolation assembly 30 is provided in the filter flask 11 for dividing the space in the filter flask 11 into a first filter chamber and a second filter chamber which are independent of each other. The pre-filter assembly 12 is located in the first filter cavity and the membrane filter assembly 20 is located in the second filter cavity. A pressurized water gap 115 is formed between the membrane filtering layer 22 and the side wall of the second filtering cavity at intervals, the pressurized water gap 115 is communicated with a raw water inlet of the membrane filtering layer 22, and the filter flask 11 is provided with a pressurized water inlet 1113 communicated with the pressurized water gap 115.

Therefore, when the pressurized water is supplied into the pressurized water gap 115 through the pressurized water inlet 1113, the first filter chamber and the second filter chamber are independent from each other, so that the filter flask 11 is not deformed during pressurization, and the split end covers 14 for splitting and forming the two filter chambers are separated from the filter flask 11, and the water channeling between the first filter chamber and the second filter chamber is caused.

The filter flask 11 be equipped with the leading filtration mouth of a river 1112 of filtering of first filter chamber intercommunication, leading filter element subassembly 12 is located raw water inlet 1111 with leading filtration is crossed between the mouth of a river 1112, gets into raw water process in the first filter chamber leading filter element subassembly 12 filters the back and obtains leading drainage, and leading drainage is followed leading filtration mouth of a river 1112 flows out.

Specifically, in one embodiment, as shown in fig. 10-13, the isolation assembly 30 is a sealed housing structure. In other words, the internal space enclosed by the isolation assembly 30 itself constitutes the first filter chamber or the second filter chamber, and the second filter chamber or the first filter chamber is enclosed between the filter flask 11 and the isolation assembly 30, so that the space of the isolation assembly 30 itself is still in a sealed state no matter how the filter flask 11 is deformed, thereby ensuring that water cannot flow between the two filter chambers.

When the inner space surrounded by the isolation assembly 30 is the first filter chamber, the second filter chamber is surrounded between the filter flask 11 and the isolation assembly 30. The pre-filter cartridge module 12 is positioned in the spacer module 30, spaced from the side walls of the filter flask 11 and/or spaced from the end walls of the spacer module 30, forming the pressurized water gap 115.

When the inner space surrounded by the isolation assembly 30 is the second filter chamber, the first filter chamber is surrounded between the filter flask 11 and the isolation assembly 30. The membrane filtration module 20 is located in the second filtration chamber, and the membrane filtration layer 22 and the isolation module 30 are spaced apart to form the pressurized water gap 115.

Further specifically, as shown in fig. 10 to 13, in one embodiment, the isolation assembly 30 includes a cylinder 31 and a cylinder cover 32, and the cylinder cover 32 is hermetically connected to an opening of the cylinder 31 to form the sealed housing structure.

Specifically, as shown in fig. 12, in one embodiment, a welding seal may be used between the cylinder 31 and the cylinder cover 32 to achieve a sealed connection between the cylinder cover 32 and the opening of the cylinder 31. Therefore, the barrel 31 and the barrel cover 32 can be reliably connected no matter the barrel 31 is subjected to inward extrusion force due to large external pressure of the barrel 31 or the barrel 31 is subjected to outward extrusion force due to large internal pressure of the barrel 31. The sealing performance of the space enclosed by the cylinder body 31 and the cylinder cover 32 is guaranteed, the first filtering cavity and the second filtering cavity are mutually independent, and the water channeling situation cannot occur.

Further, as shown in fig. 12, an annular mounting groove may be provided on the cover 32 at a position opposite to the open end of the cylinder 31, the cylinder 31 is inserted into the annular mounting groove, and then the cylinder 31 and the cover 32 are further welded to make the connection therebetween more compact and reliable. Specifically, the cylinder 31 and the cylinder cover 32 may be welded by spin-welding.

Alternatively, in another embodiment, as shown in fig. 13, an annular mounting groove is formed in the cover 32 at a position opposite to the open end of the cylinder 31, the cylinder 31 is inserted into the annular mounting groove, and a sealing member is disposed between the cylinder 31 and the side wall of the annular mounting groove.

Based on the fact that the cylinder body 31 is inserted into the annular mounting groove, and a sealing element is arranged between the cylinder body 31 and the side wall of the annular mounting groove, when the cylinder body 31 is pressed, the cylinder body 31 and the cylinder cover 32 can still be connected together in a sealing manner without dislocation, and the first filter cavity and the second filter cavity are ensured to be independent from each other and cannot generate water channeling.

Further, as shown in fig. 10 and 11, a water passing gap is formed between the side wall of the isolation assembly 30 and the side wall of the filter flask 11 at an interval, a first flow guiding rib 311 is arranged outside the side wall of the isolation assembly 30, and the first flow guiding rib 311 is located between the side wall of the filter flask 11 and the side wall of the isolation assembly 30.

When the isolation assembly 30 is pressed, the whole pressure is uniformly distributed on the side wall and the end wall of the isolation assembly 30, so that the isolation assembly 30 is uniformly stressed as a whole, the deformation and dislocation are avoided, and the sealing reliability of the sealed space surrounded by the isolation assembly 30 is ensured.

Further, in one embodiment, as shown in fig. 7-9, the composite filter element 10 further includes a front center tube 13. When membrane filtration subassembly 20 with leading filter element subassembly 12 is located in the filter flask 11, and follow when the axial of filter flask 11 sets gradually, be close to on the filter flask 11 the one end of membrane filtration subassembly 20 is first end 111. The raw water inlet 1111 and the purified water outlet 1115 are both located on the end face of the first end 111. One end of the front center pipe 13 is communicated with the raw water inlet 1111, and the front center pipe 13 sequentially passes through the membrane rolling center pipe 21 and the partition end cap 14 and then is inserted into the first filter chamber, so that raw water such as tap water entering from the raw water inlet 1111 enters the first filter chamber and is filtered by the front filter element assembly 12, and pre-filtered water obtained after being filtered by the front filter element assembly 12 enters the second filter chamber.

Specifically, in one embodiment, prefiltered water obtained by filtration through the prefilter assembly 12 in the first filter chamber may flow directly inside the filter flask 11 to the second filter chamber; or the pre-filtered water can flow out of the filter bottle 11 before being delivered into the second filter chamber under pressure.

Further, in one embodiment, as shown in fig. 6-9, the composite filter element 10 further includes a guide center tube 15. The end surface of the first end 111 is further provided with a pre-filtering water outlet 1112, a pressurizing water inlet 1113 and a concentrated water outlet 1114. The dividing end cover 14 is provided with a water passing jack 141, the front center pipe 13 is inserted into the water passing jack 141, and the front center pipe 13 and the side wall of the water passing jack 141 are arranged at intervals. The peripheral surface of the preposed filter element assembly 12 and the side wall of the filter flask 11 are arranged at intervals to form a raw water gap 113. The front center pipe 13 is communicated with the raw water gap 113 so that the raw water introduced from the raw water inlet 1111 passes through the front center pipe 13 to reach the raw water gap 113, and then is gradually filtered by the outer circumference of the front filter cartridge assembly 12 to flow inwardly, thereby forming front filtered water.

As shown in fig. 7 and 8, the guiding central tube 15 is sleeved outside the front central tube 13, and the guiding central tube 15 is located between the front central tube 13 and the film winding central tube 21. One end of the guide central tube 15 is communicated with the water passing jack 141, the guide central tube 15 and the front central tube 13 are arranged at intervals to form a front filtering water gap 114, and the front filtering water outlet 1112 is communicated with the front filtering water gap 114. The prefiltered water filtered by the prefilter assembly 12 flows from the gap between the front center tube 13 and the side wall of the water insertion hole 141 to the prefilter gap 114, and finally flows out of the filter bottle 11 through the prefilter water outlet 1112.

Alternatively, as shown in fig. 10, in an embodiment, when the inner space enclosed by the isolation assembly 30 is the first filter chamber, the second filter chamber is enclosed between the filter flask 11 and the isolation assembly 30. The pre-filter core assembly 12 is located in an inner space surrounded by the isolation assembly 30, after one end of the pre-center pipe 13 is communicated with the raw water inlet 1111, the other end of the pre-center pipe 13 needs to sequentially pass through the coiled membrane center pipe 21 and an end wall of the isolation assembly 30 close to the raw water inlet 1111 and then can be inserted into the first filter cavity.

At this time, the pre-filter assembly 12 is spaced apart from the sidewall of the isolation assembly 30 to form a raw water gap 113. An end wall of the isolation assembly 30 close to the raw water inlet 1111 is provided with a water passing jack 141, and one end of the front filter element assembly 12 is tightly abutted to the end wall of the isolation assembly 30 provided with the water passing jack 141. The other end of leading filter element group spare 12 is equipped with leading end cover 17, leading end cover 17 is equipped with leading water hole 171. A gap is provided between the front end cap 17 and the end wall of the isolating member 30, so that the front water passing hole 171 communicates with the raw water gap 113. The front center pipe 13 is communicated with the front water passing hole 171 through the water passing insertion hole 141, thereby guiding the raw water of the raw water inlet 1111 into the raw water gap 113.

After the raw water entering the raw water gap 113 is filtered by the prefilter assembly 12, the obtained prefilter water flows to the prefilter water outlet 1112 along the prefilter water gap 114, and then is discharged out of the composite filter element 10.

In yet another embodiment, as shown in fig. 7 and 8, the membrane filtration module 20 is spaced from the filter flask 11 and/or the segmented end cap 14 to form a pressurized water gap 115. The pressurized water gap 115 is communicated between the raw water inlet of the membrane filter layer 22 and the pressurized water inlet 1113, and the pre-filtered water flowing out of the filter flask 11 from the pre-filtered water inlet 1112 is pressurized outside the composite filter element 10, enters the pressurized water gap 115 from the pressurized water inlet 1113, enters the raw water inlet of the membrane filter layer 22, and is further filtered in the membrane filter layer 22. The concentrated water outlet 1114 is communicated with a concentrated water outlet of the membrane filtration layer 22, concentrated water obtained by filtering in the membrane filtration layer 22 flows out of the composite filter element 10 from the concentrated water outlet 1114, and obtained pure water further enters the post-filter element 211 for further filtering to finally obtain pure water, and the pure water flows out of the composite filter element 10 from the pure water outlet 1115.

Specifically, as shown in fig. 7 to 9, an adapter sleeve 18 and a water sealing member 19 are disposed at an end of a membrane filter layer 22 of a membrane filter assembly 20 installed in the second filter chamber, the adapter sleeve 18 and the water sealing member 19 are disposed at an end of the membrane filter layer 22 far from the front filter element assembly 12, an end of the filter flask 11 far from the front filter element assembly 12 is a first end 111, the adapter sleeve 18 is connected with an end wall of the second end 112, and an end of the rolled membrane central tube 21 near the second end 112 abuts against the dividing end cap 14. So that the pressurised water gap 115 is formed between the filter flask 11, adapter sleeve 18, water seal 19, membrane filter layer 22 and dividing end cap 14.

The raw water inlet 1111, the pre-positioned filtering water outlet 1112, the pressurizing water inlet 1113, the concentrated water outlet 1114 and the purified water outlet 1115 of the composite filter element 10 are all arranged at the first end 111, so that the installation convenience is improved.

Further, as shown in fig. 7, 8 and 10, in one embodiment, the guiding central tube 15 is spaced apart from the membrane rolling central tube 21 to form a clean water gap 116, and the clean water gap 116 is communicated with the clean water outlet 1115. In other words, the central guide tube 15 is spaced apart from the rear filter element 211 and the end cap 212 near the first end 111 to form the clean water gap 116. The purified water obtained after being filtered by the rear filter element 211 enters the purified water gap 116, flows to the purified water outlet 1115 along the purified water gap 116, and is finally discharged out of the composite filter element 10. Thereby improving the integration and miniaturization of the composite filter element 10 as a whole.

Further, as shown in fig. 8 and 10, in an embodiment, an ultrafiltration membrane 16 is disposed in the clean water gap 116, and the ultrafiltration membrane 16 is intercepted between the post-filter element 211 and the clean water outlet 1115, so that the clean water filtered by the post-filter element 211 is further filtered by the ultrafiltration membrane 16 and then discharged from the clean water outlet 1115.

Further, in one embodiment, as shown in fig. 7 and 8, when the split end cap 14 is provided in the filter bottle 11, one end of the front filter element assembly 12 abuts against the split end cap 14, and the other end of the front filter element assembly 12 is provided with a front end cap 17. The front end cover 17 is provided with a front water through hole 171 penetrating through two end faces of the front end cover 17, and the front center tube 13 is communicated with the front water through hole 171. The one end that is close to leading filter element subassembly 12 on the filter flask 11 is second end 112, leading end cover 17 with be equipped with the clearance between the end wall of second end 112, make leading water hole 171 with raw water clearance 113 intercommunication.

Raw water entering from the raw water inlet 1111 sequentially passes through the front center pipe 13, the front water passing hole 171 and the gap between the front end cover 17 and the end wall of the second end 112 to enter the raw water gap 113 outside the front filter element assembly 12.

Further, in another embodiment, when the second filter chamber is enclosed by the isolation assembly 30, the first filter chamber is enclosed between the isolation assembly 30 and the filter bottle 11. The pre-centering tube 13 needs to pass through both end walls of the spacer assembly 30 before it can be inserted into the first filter chamber.

Specifically, in one embodiment, two ends of the front filter element assembly 12 respectively abut against the end wall of the isolation assembly 30 and the end wall of the second end 112 of the filter bottle 11, and the front filter element assembly 12 and the side wall of the filter bottle 11 are disposed at an interval to form a raw water gap 113. The water passing gap communicates the raw water inlet 1111 with the raw water gap 113. So that the raw water can enter the raw water gap 113 through the raw water inlet 1111 and the water gap, and the raw water entering the raw water gap 113 is filtered again through the pre-filter assembly 12.

Two end walls of the isolation assembly 30 are provided with water passing jacks 141, one end of the front center pipe 13 is communicated with the front filter water outlet 1112, the front center pipe 13 penetrates through the water passing jacks 141 and is inserted into the front filter element assembly 12, and the film rolling center pipe 21 is sleeved outside the front center pipe 13.

The prefiltered water obtained by filtering through the prefilter assembly 12 flows from the prefilter center pipe 13 to the prefilter water outlet 1112, and finally exits the filter bottle 11 through the prefilter water outlet 1112.

Further, in this case, the membrane filtration layer 22 is spaced from the side and/or end walls of the isolation assembly 30 to form a pressurized water gap 115 in communication with the pressurized water inlet 1113. Prefiltered water discharged from the prefilter water inlet 1112 may enter the pressurized water gap 115 from the pressurized water inlet 1113.

Further, in another embodiment, when the inner space enclosed by the isolation assembly 30 is the second filter chamber, the first filter chamber is enclosed between the filter flask 11 and the isolation assembly 30. The front center pipe 13 and the guide center pipe 15 can still be used, so that the raw water flows into the first filter chamber from the front center pipe 13, and the pre-filtered water flows out of the filter bottle 11 from the gap between the front center pipe 13 and the guide center pipe 15.

Specifically, the front filter element assembly 12 and the side wall of the filter bottle 11 are arranged at intervals to form a raw water gap 113. The one end of leading filter element group spare 12 with the end wall of isolation subassembly 30 supports tightly, the other end of leading filter element group spare 12 is equipped with leading end cover 17, be equipped with on the leading end cover 17 and run through leading water hole 171 of crossing of two terminal surfaces of leading end cover 17, leading end cover 17 with be equipped with the clearance between the end wall of second end 112, make leading water hole 171 of crossing with raw water clearance 113 intercommunication. The two end walls of the isolation assembly 30 are provided with water passing jacks 141, one end of the front center pipe 13 is communicated with the raw water inlet 1111, and the front center pipe 13 passes through the water passing jacks 141 and the front filter element assembly 12 and is communicated with the front water passing hole 171. The front central tube 13 and the side wall of the water passing jack 141 are arranged at intervals, the guide central tube 15 is sleeved outside the front central tube 13, the membrane rolling central tube 21 is sleeved outside the guide central tube 15, and the guide central tube 15 and the front central tube 13 are arranged at intervals to form a front filtering water gap 114. The guide central tube 15 is communicated with the water passing insertion hole 141, and one end of the front filtered water gap 114 far away from the water passing insertion hole 141 is communicated with the front filtered water outlet 1112.

Similarly, the membrane filtration layer 22 is now spaced from the side and/or end walls of the isolation assembly 30 to form a pressurized water gap 115 in communication with the pressurized water inlet 1113.

Further, in another embodiment, a water purifier system 40 is provided, which comprises the composite filter element 10. By adopting the composite filter element 10 of any one of the embodiments, the integration level of the water purifier system 40 is improved, and meanwhile, the manufacturing cost of the water purifier system 40 is effectively controlled under the condition of meeting the filtering requirement.

Further, in one embodiment, as shown in fig. 15 and 16, a pressurizing passage 41 is provided between the prefilter water outlet 1112 and the pressurizing water inlet 1113, and a pressurizing water pump 411 is provided on the pressurizing passage 41, so that prefilter water can be further pressurized and fed into the pressurizing water gap 115. Particularly, when the membrane filter layer 22 is the reverse osmosis membrane filter layer, the filtration process of the reverse osmosis membrane filter layer needs to be performed by a certain pressure difference, and the pressure water pump 411 provides pressure guarantee for the normal filtration process of the reverse osmosis membrane filter layer.

Further, in an embodiment, as shown in fig. 15 and 16, the clean water outlet 1115 is provided with a clean water passage 42, the clean water passage 42 is used for communicating with a faucet 45, the clean water passage 42 is provided with a pressure sensing member 421, and the pressure sensing member 421 is electrically connected with the pressurized water pump 411.

The pressure sensor 421 senses the pressure in the purified water passage 42 to control the start and stop of the pressurized water pump 411. When the water tap 45 is closed, the pressure in the water purification passage 42 increases, and when the pressure sensing member 421 detects that the pressure in the water purification passage 42 increases to a predetermined high pressure value, the pressurized water pump 411 is controlled to stop operating, so as to reduce the pressure in the water purification system 40. When the faucet 45 is turned on, the pressure in the clean water passage 42 decreases, and when the pressure sensor 421 detects that the pressure in the clean water passage 42 decreases to a predetermined low pressure value, the pressurized water pump 411 is controlled to start. Therefore, the water supply pressure is kept stable all the time, and the stability of the water supply flow is improved.

The electrical connection between the pressure sensing member 421 and the pressurized water pump 411 can be achieved indirectly through a control system, and both the pressure sensing member 421 and the pressurized water pump 411 are electrically connected to the control system. In other words, after the pressure sensing element 421 senses the pressure on the purified water passage 42, the control system controls the start and stop of the pressurized water pump 411 according to the sensed pressure.

Further, as shown in fig. 15 and 16, in an embodiment, a first electromagnetic valve 412 is disposed on the pressurizing passage 41, the first electromagnetic valve 412 is located between the pressurizing water pump 411 and the pre-filter drain port 1112, and the first electromagnetic valve 412 is electrically connected to the pressure sensing member 421.

When the pressure sensed by the pressure sensing element 421 indicates that the faucet 45 is closed, the first electromagnetic valve 412 electrically connected to the pressure sensing element 421 is closed, so that the pressurizing passage 41 is closed, the water in the pre-filtering water outlet 1112 cannot continuously flow along the pressurizing passage 41, and the composite filter element 10 stops filtering, thereby protecting the membrane filtering layer 22 and the membrane winding central tube 21. When the pressure sensed by the pressure sensor 421 indicates that the faucet 45 is opened, the first solenoid valve 412 and the pressurized water pump 411 are opened, and the composite filter element 10 enters a filtering state.

Further, in one embodiment, as shown in fig. 16, the water purifier system 40 further comprises an additional passage 43, wherein the additional passage 43 is communicated between the pressurizing passage 41 and the water faucet 45. A position on the pressurizing passage 41 for communication with the surplus passage 43 is located between the first solenoid valve 412 and the front filter drain port 1112.

When the requirement of the user on the water quality is low and the pre-filtered water filtered by the pre-filter element assembly 12 can meet the requirement, the additional passage 43 can guide the pre-filtered water on the pressurizing passage 41 to the water faucet 45 for the user to use. It should be noted that, as shown in fig. 2, when the user has different requirements on the water quality, the water faucet 45 is provided with at least two switches, which are respectively used for controlling the outflow of water with different water qualities. When the corresponding switch is turned on, water in the corresponding passage flows out from the faucet 45.

When the quality of the pre-filtered water can meet the requirements of users, the switch on the water faucet 45 for communicating with the water purifying passage 42 is turned off. When the pressure sensor 421 senses that the pressure increase reaches a predetermined high pressure value, the pressurized water pump 411 and the first solenoid valve 412 are both closed, the pre-filter assembly 12 still can filter, and pre-filtered water obtained by filtering flows to the water faucet 45 through the additional passage 43 for the user to use.

Further, in one embodiment, as shown in fig. 1 and fig. 2, the concentrate outlet 1114 is provided with a concentrate passage 44, the concentrate passage 44 is provided with a concentrate solenoid valve 441, and the concentrate solenoid valve 441 is electrically connected to the pressure sensing member 421. When the pressure sensing part 421 senses that the pressure on the water purification passage 42 reaches a preset high pressure value, the concentrated water electromagnetic valve 441, the pressurized water pump 411 and the first electromagnetic valve 412 are controlled to be closed, and the raw water side and the concentrated water side of the membrane filtration layer 22 are both in a closed state, so that the pressure in the membrane filtration layer 22 is stable.

Specifically, in one embodiment, the pressure sensing member 421 is a pressure switch for sensing the pressure on the purified water passage 42, and the pressure switch is electrically connected to the pressurized water pump 411. The pure water passage 42 is provided with a one-way valve 422, so that water in the pure water passage 42 can only flow from the pure water outlet 1115 to the water tap 45, and the one-way valve 422 is positioned between the pressure sensing piece 421 and the pure water outlet 1115. It is ensured that the water in the clean water passage 42 does not flow back into the membrane winding center tube 21 when the pressurized water pump 411 is stopped.

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", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and 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 at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. 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 application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The membrane filtering assembly is characterized by comprising a membrane rolling central tube and a membrane filtering layer, wherein the membrane rolling central tube comprises a rear filter element and end covers arranged at two ends of the rear filter element, the membrane filtering layer is sleeved on the membrane rolling central tube, the axial length of the rear filter element is H1, the axial length of the membrane filtering layer is H1, and H1/H1 is 30% -70%.

2. The membrane filtration module according to claim 1, wherein a guide groove is provided on the outer peripheral surface of the end cap at a position covered by the membrane filtration layer, and liquid in the guide groove can flow into the post-filter element.

3. The membrane filter assembly according to claim 2, wherein the flow guide grooves are arranged in the axial direction of the membrane filter layer, and the flow guide grooves are distributed at intervals in the circumferential direction of the outer peripheral surface of the end cover.

4. The membrane filtration assembly of claim 2, wherein the portion of the outer peripheral surface of the end cap covered by the membrane filtration layer comprises a water seal zone, the membrane filtration layer being connected to the end cap at the water seal zone, the flow guide groove being located on a side of the water seal zone adjacent to the post-filter element.

5. The membrane filtration assembly of claim 1, wherein the end cap is provided with a diversion hole, an inlet of the diversion hole is positioned on the outer circumferential surface of the end cap at a position covered by the membrane filtration layer, and an outlet of the diversion hole is positioned on the end surface of the end cap contacting with the post-filter element.

6. The membrane filtration assembly according to any one of claims 1 to 5, wherein the post-filter element is a cylindrical structure, the end cap is provided with a through hole penetrating through two end faces, the through hole of the cylindrical structure is communicated with the through hole of the end cap to form a middle through hole of the membrane rolling central tube, a support frame is arranged in the post-filter element and is supported on the inner circumferential surface of the post-filter element, and water passing holes are arranged on the support frame.

7. The membrane filtration module according to any one of claims 1 to 5, wherein the membrane filtration layer comprises a reverse osmosis membrane filtration layer rolled onto the rolled membrane center tube;

8. A membrane filtration module according to any one of claims 1 to 5, wherein the post-filter element comprises a carbon rod.

9. A composite filter element comprising the membrane filtration module of any one of claims 1 to 8.

10. The composite filter element according to claim 9, further comprising a filter flask and a pre-filter element assembly, wherein the membrane filter assembly and the pre-filter element assembly are both located in the filter flask, the membrane filter assembly and the pre-filter element assembly are sequentially arranged in the axial direction of the filter flask, the filter flask is provided with a raw water inlet and a purified water outlet, the raw water inlet is communicated with the pre-filter element assembly, pre-filtered water obtained by filtering the pre-filter element assembly can sequentially pass through the membrane filter layer and the post-filter element to obtain purified water, and the purified water outlet is communicated with an outlet of the membrane rolling central tube.

11. The composite filter element according to claim 10, further comprising a front center tube, wherein one end of the filter flask close to the membrane filter assembly is a first end, the raw water inlet and the purified water outlet are both located at an end surface of the first end, a partition end cap is arranged in the filter flask to partition a space in the filter flask into a first filter chamber and a second filter chamber, the front filter element assembly is located in the first filter chamber, the membrane filter assembly is located in the second filter chamber, one end of the front center tube is communicated with the raw water inlet, and the front center tube is inserted into the first filter chamber after sequentially passing through the rolling center tube and the partition end cap.

12. The composite filter element according to claim 11, further comprising a guiding central tube, wherein the end face of the first end is further provided with a pre-filtering water outlet, a pressurizing water inlet and a concentrated water outlet, the splitting end cap is provided with a water passing jack, the front central tube is inserted into the water passing jack, the front central tube is spaced from the side wall of the water passing jack, the outer peripheral surface of the front filter element assembly is spaced from the side wall of the filter flask to form a raw water gap, the front central tube is communicated with the raw water gap, the guiding central tube is sleeved outside the front central tube, the guiding central tube is located between the front central tube and the rolling membrane central tube, one end of the guiding central tube is communicated with the water passing jack, the guiding central tube is spaced from the front central tube to form a pre-filtering water gap, the membrane filtration assembly is arranged at intervals with the filter bottle and/or the segmentation end cover to form a pressurized water gap, the pressurized water gap is communicated between a raw water inlet and a pressurized water inlet of the membrane filtration layer, and the concentrated water outlet is communicated with a concentrated water outlet of the membrane filtration layer.

13. The composite filter element of claim 12, wherein the guide center tube and the membrane winding center tube are spaced apart from each other to form a purified water gap, and the purified water gap is communicated with the purified water outlet.

14. The composite filter element of claim 13, wherein an ultrafiltration membrane is disposed in the clean water gap and is intercepted between the post-filter element and the clean water outlet.

15. The composite filter element according to claim 12, wherein one end of the front filter element assembly abuts against the split end cap, the other end of the front filter element assembly is provided with a front end cap, the front end cap is provided with a front water through hole penetrating through two end faces of the front end cap, the front center tube is communicated with the front water through hole, one end of the filter bottle close to the front filter element assembly is a second end, and a gap is arranged between the front end cap and an end wall of the second end, so that the front water through hole is communicated with the raw water gap.

16. A water purification system comprising a composite filter element according to any one of claims 9 to 15.